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

Abstract

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

Description

Technical Field

[0001] The present invention relates to the field of lithium battery production, and in particular to a lithium battery electrode raw material feeding device, a lithium battery production system and a method thereof. Background Art

[0002] Lithium battery, also known as lithium power battery, is a high-energy battery successfully developed in the mid-20th century. The negative electrode of this battery is a metal containing lithium ions, and the positive electrode is made of MnO2, SOCL2 and other materials. Due to its high energy, high battery voltage, wide operating temperature range, and long storage life, lithium batteries have been widely used in military and civilian fields. With the development of science and technology, large-capacity lithium batteries can be used as a stable and reliable source of power, making it possible for cars to be driven by electricity, especially after 2020. The technological explosion of lithium batteries has promoted the rapid development of electric vehicle technology; in addition to the field of electric vehicles, lithium batteries are also widely used in artificial satellites, aerospace, energy storage and other fields.

[0003] The existing lithium battery production technology has the following problems: 1. The amount of material put in during the feeding process is difficult to control; 2. When preparing the slurry for coating the current collector, if the particle size of the raw material is relatively small and its specific surface area is large, it will make it difficult to control the particle size distribution, resulting in unreasonable local slurry ratio, which may not only lead to instability of the same batch of pole pieces, but also unreasonable raw material ratios may increase the internal resistance of the battery, reduce battery performance and service life; 3. After the pole pieces are prepared, due to slight differences in the shape of each battery shell and electrode, the position of the electrode relative to the battery shell may be inaccurate, and due to the obstruction of the electrode by other components, it is difficult to intuitively find that the position of the electrode is wrong. The incorrect position of the electrode will lead to poor product quality, such as decreased battery performance, burrs piercing the diaphragm after a period of use causing short circuits, increased battery internal resistance, and decreased Coulomb efficiency in cycle performance. Summary of the invention

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

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

[0006]

[0007] Where V bis the volume of the inner cavity of the stirring tank, α is any ratio between [40%, 75%], S is the solid content of the desired slurry, P is the proportion of the material stored in each storage tank in the mix, and d is the density corresponding to the material stored in the storage tank.

[0008] Furthermore, a plurality of air outlets are arranged along the longitudinal direction on the inner wall of the stirring tank, and the plurality of air outlets are externally connected to a fan, and the wind speed of the air outlets is calculated by the following formula:

[0009]

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

[0011] Furthermore, a stirring shaft is arranged in the stirring kettle, a plurality of stirring blades are arranged on the stirring shaft, the top of the stirring shaft extends out of the top of the stirring kettle, 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 stirring tank.

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

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

[0015] Step 1: According to the formula, calculate the amount of material W that should be put into each storage tank according to the following formula:

[0016]

[0017] Where Vb is the volume of the inner cavity of the stirred tank, α is any ratio between [40%, 75%], S is the solid content of the desired slurry, P is the proportion of the material stored in each storage tank in the mix, and d is the density corresponding to the material stored in the storage tank;

[0018] Step 2: Open the metering valves of several storage tanks respectively, and feed the material into the stirring tank according to the feeding amount W calculated in the first step;

[0019] Step 3: Start the stirring motor to stir the material and turn on the fan to send air into the stirring kettle. Calculate the wind speed at the air outlet according to the following formula:

[0020]

[0021] Where v is the wind speed at the air outlet, and is controlled to be 3m / s≤v≤7m / s, Q is the gas flow rate, and A is the area of ​​the air outlet;

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

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

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

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

[0026]

[0027] Where L is the error in 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 true box, and p is the penalty term for the aspect ratio.

[0028] Furthermore, an upper welding wire machine for setting welding wire at the welding point is provided at the upper welding wire station, and a welding machine for welding batteries is provided at the welding station.

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

[0030] Furthermore, a good product unloading belt for transporting qualified products and a second screening belt for transporting defective products are arranged at the unloading station, and a unloading robot for unloading is arranged between the good product unloading belt, the second screening belt and the unloading station.

[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 arranged 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 shells is arranged at the head end of the conveyor belt, an upper electrode station is arranged between the loading station and the upper welding wire station, and an upper electrode manipulator for placing electrodes on the battery shell is arranged at the upper electrode station.

[0035] Furthermore, it also includes an upper electrode belt for transporting electrodes, and the terminal end of the upper electrode belt 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 a plurality of storage tanks, the outlet end of each storage tank is connected to the inner cavity of the stirring tank, and a metering valve is provided at the outlet of each storage tank. Each storage tank calculates the feeding amount W of the stored material according to the following formula:

[0037]

[0038] Where V b is the volume of the inner cavity of the stirring tank, α is any ratio between [40%, 75%], S is the solid content of the desired slurry, P is the proportion of the material stored in each storage tank in the mix, and d is the density corresponding to the material stored in the storage tank.

[0039] Furthermore, a plurality of air outlets are arranged along the longitudinal direction on the inner wall of the stirring tank, and the plurality of air outlets are externally connected to a fan, and the wind speed of the air outlets is calculated by the following formula:

[0040]

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

[0042] Furthermore, a stirring shaft is arranged in the stirring kettle, a plurality of stirring blades are arranged on the stirring shaft, the top of the stirring shaft extends out of the top of the stirring kettle, 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 stirring tank.

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

[0045] The assembly method of lithium battery electrodes is as follows:

[0046] (A): A jig loaded with several battery shells is placed from the loading station;

[0047] (B): When the jig passes through the upper electrode station on the conveyor belt, the upper electrode manipulator transfers the electrode on the upper electrode belt and installs it on the corresponding battery housing;

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

[0049] (D): The conveyor belt transports the jig to the first detection device. The first top detector and the first side detector of the first detection device emit X-rays to detect the relative position of the electrode and the battery shell, and detect whether the position of the electrode is within the acceptable range through the electrode position error formula built into the first computing device. 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 first screening robot transfers the battery to the first screening belt for transportation;

[0050] (E): The conveyor belt transports the jig to the welding station, and the welding machine installed at the welding station welds the electrode and the battery shell into one;

[0051] (F): The conveyor belt transports the jig to a polarity detection device, and the polarity detection device detects the polarity performance of the battery welded on the jig;

[0052] (G): The conveyor belt transports the welded batteries to the unloading station. The unloading robot grabs the batteries and places them on the good product unloading belt. When passing through 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 shell, and use the electrode position error formula built into the second computing device to detect whether the position of the welded electrode is within an acceptable range. If the position of the electrode is within the acceptable range, it will continue to be transported out by the good product unloading belt. If the position of the electrode is outside the acceptable range, the unloading robot will transfer the battery to the second screening belt.

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

[0054]

[0055] Where L is the error in 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 true box, and p is the penalty term for the aspect ratio.

[0056] Furthermore, the L value of the acceptable range of 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 the optimal stirring range of the stirring kettle into consideration, thereby improving the mixing quality of the stirring kettle as much as possible, and also making the distribution of the materials in the slurry as uniform as possible; 2. During the stirring process of the stirring kettle, air flow mixing is introduced, and the air flow velocity is controlled within a reasonable range, which not only improves the effect and efficiency of material mixing, but also prevents negative effects such as bubbles in the slurry caused by excessive air flow velocity; 3. The first detection device and the second detection device both detect the position of the electrode by X-rays, which can eliminate the obstruction of the line of sight by parts; 4. The first detection device and the second detection device respectively use built-in electrode position error formulas, and the formula can consider geometric factors more comprehensively and solve the problem of sample imbalance, thereby improving the accuracy of electrode positioning, and can more accurately judge the relative position relationship between the motor and the battery shell, and screen out defective products with inaccurate positions as much as possible before welding, so that enterprises can reuse electrodes or battery shells that have not been welded. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0059] Figure 2 It is a cross-sectional view of the stirring tank in the present invention.

[0060] Figure 3 It is a three-dimensional view of the electrode assembly device of the present invention at one angle.

[0061] Figure 4 It is a three-dimensional view from another angle of the electrode assembly device of the present invention.

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

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

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

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

[0066] Fig. 9It is a schematic diagram of the unloading device in the electrode assembly device of the present invention.

[0067] Fig.10 The present invention is a flow chart of the method for feeding raw materials for lithium battery electrodes.

[0068] Fig.11 The figure is a flow chart of the method for assembling the lithium battery electrode of the present invention.

[0069] Among them: 1. Storage tank; 101. Metering valve; 2. Fan; 3. Mixing kettle; 301. Pressure relief valve; 302. Mixing motor; 303. Kettle body; 304. Air outlet pipe; 3041. Air outlet; 305. Mixing shaft; 306. Mixing blade; 4. Coating device; 5. Conveyor belt; 501. Sensor; 6. Upper electrode belt; 7. Upper electrode manipulator; 8. Upper welding wire machine; 9. First detection device; 901. First top detector; 902. First side detector; 10. First screening manipulator; 11. First screening belt; 12. Welding machine; 13. Polarity detection device; 14. Elevator; 15. Second screening belt; 16. Unloading device; 1601. Second top detector; 1602. Unloading manipulator; 1603. Second side detector; 17. Good product unloading belt. DETAILED DESCRIPTION

[0070] The technical solution of the present invention is further described below in conjunction with the accompanying drawings.

[0071] See attached Figures 1 to 9 The lithium battery production system shown in the present invention includes a lithium battery electrode raw material feeding device, which includes a stirring kettle 3 for mixing the raw materials into slurry and a plurality of storage tanks 1.

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

[0073]

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

[0075] The inner cavity of the stirring tank 3 is provided with an air outlet pipe 304, which is arranged in the longitudinal direction. The air outlet pipe 304 is provided with a plurality of air outlets 3041, and the air outlet pipe 304 is externally connected to the fan 2. The wind speed at the air outlet 3041 is calculated by the following formula:

[0076]

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

[0078] The stirring kettle 3 includes a kettle body 303, a stirring shaft 305 is arranged in the kettle body 303, 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 kettle 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 arranged on the top of the kettle body 303, and the pressure relief valve 301 is used to relieve pressure when the air pressure in the kettle body 303 is too high.

[0079] It also includes a coating device 4, which is connected to the output end of the stirring tank 3. The coating device 4 is used to coat the slurry on the current collector to form an electrode plate.

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

[0081] The conveyor belt 5 is provided with a loading station, an upper electrode station, an upper welding wire station, a welding station and a unloading station in sequence from the head end to the tail end.

[0082] A loading station for loading the battery shell is arranged at the head end of the conveyor belt 5, an upper electrode station is arranged between the loading station and the upper welding wire station, an upper electrode manipulator 7 for placing the electrode on the battery shell is arranged at the upper electrode station, and also includes an upper electrode belt 6 for transporting the electrode, and the terminal end of the upper electrode belt 6 corresponds to the position of the upper electrode manipulator 7.

[0083] An upper welding wire machine 8 for setting welding wire at the welding position is arranged at the upper welding wire station, and a welding machine 12 for welding batteries is arranged at the welding station.

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

[0085] A polarity detection device 13 for detecting the performance of battery electrodes after welding is arranged between the welding station and the unloading station, and a detection end of the polarity detection device 13 corresponds to the conveyor belt 5 .

[0086] The unloading station is arranged at the end of the conveyor belt 5. A lift 14 is arranged at the unloading station for lifting the battery to a height convenient for the unloading device 16 to grasp. The lift 14 can also be regarded as an extension of the unloading station.

[0087] In order to save space and facilitate operation, the second detection device and the unloading manipulator 1602 are integrated into the unloading device 16. The second detection device includes 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 computing device (not shown). The second top detector 1601 and the second side detector 1603 are respectively connected to the second computing device. The second top detector 1601 and the second side detector 1603 are X-ray detectors. The second computing device has a built-in electrode position error formula. A good unloading belt 17 for transporting qualified products and a second screening belt 15 for transporting defective products are also provided at the unloading station. A unloading manipulator 1602 for unloading is provided between the good unloading belt 17, the second screening belt 15 and the unloading station.

[0088] The electrode position error formula built into the first computing device and the second computing device is as follows:

[0089]

[0090] Where L is the error in 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 true box, and p is the penalty term for the aspect ratio.

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

[0092] Step 1: According to the formula, calculate the amount of material W that should be put into each storage tank 1 according to the following formula:

[0093]

[0094] Where V b is the volume of the inner cavity of the stirring tank 3, α is any ratio between [40%, 75%], S is the solid content of the desired slurry, P is the proportion of the material stored in each storage tank 1 in the proportion, and d is the density corresponding to the material stored in the storage tank 1;

[0095] Step 2: several storage tanks 1 open the metering valves 101 respectively, and feed the material into the stirring tank 3 according to the feeding amount W calculated in the first step;

[0096] Step 3: The stirring motor 302 is started to stir the material and the fan 2 is turned on at the same time to send air flow into the stirring kettle 3. The wind speed at the air outlet 3041 is calculated according to the following formula:

[0097]

[0098] Wherein v is the wind speed of the air outlet 3041 and is controlled to be 3m / s≤v≤7m / s, Q is the flow rate of the gas, and A is the area of ​​the air outlet 3041;

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

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

[0101] (A): A jig loaded with several battery shells is placed from the loading station;

[0102] (B): When the jig passes through the upper electrode station on the conveyor belt 5, the upper electrode manipulator 7 transfers the electrode on the upper electrode belt 6 and installs it on the corresponding battery housing;

[0103] (C): The conveyor belt 5 transports the jig to the upper welding wire station, and the upper welding wire machine 8 arranged at the upper welding wire station places the welding wire at the welding seam;

[0104] (D): The conveyor belt 5 transports the jig 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 shell, and detect whether the position of the electrode is within an acceptable range through the electrode position error formula built into the first computing device. 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 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, p is the penalty term of the aspect ratio, 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 first screening robot 9 transfers the battery to the first screening belt 11 for transportation;

[0107] (E): The conveyor belt 5 transports the jig to the welding station, and the welding machine 12 set at the welding station welds the electrode and the battery shell into one;

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

[0109] (G): The conveyor belt 5 transports the welded battery to the unloading station. The unloading robot 1602 grabs the battery and places it 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 electrode and the battery shell, and detect whether the welded electrode position is within an acceptable range through the electrode position error formula built into the second computing device. The electrode position error formula is as follows:

[0110]

[0111] Where L is the error in 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 for the aspect ratio. If the electrode position L value is 0≤L≤0.05, the good product unloading belt 17 will continue to transport it out. If the electrode position L value is 0.05<L≤1, the unloading robot 1602 will transfer the battery to the second screening belt 15.

Claims

1. A lithium battery electrode raw material feeding device, characterized in that: The invention comprises a stirring tank (3) for mixing raw materials into slurry and a plurality of storage tanks (1), wherein the outlet end of each storage tank (1) is connected to the inner cavity of the stirring tank (3), and a metering valve (101) is provided at the outlet of each storage tank (1). The amount of material stored in each storage tank (1) is calculated according to the following formula: Where V b is the volume of the inner cavity of the stirring tank (3), α is any ratio between [40%, 75%], S is the solid content of the desired slurry, P is the proportion of the material stored in each storage tank (1) in the mix, and d is the density corresponding to the material stored in the storage tank (1).

2. The lithium battery electrode raw material feeding device according to claim 1, characterized in that: The inner wall of the stirring tank (3) is provided with a plurality of air outlets (3041) along the longitudinal direction. The plurality of air outlets (3041) are externally connected to a fan (2). The wind speed at the air outlets is calculated by the following formula: Wherein v is the wind speed of the air outlet (3041), Q is the flow rate of the gas, and A is the area of ​​the air outlet (3041).

3. The lithium battery electrode raw material feeding device according to claim 1, characterized in that: A stirring shaft (305) is arranged in the stirring kettle (3), 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 kettle (3), and the top of the stirring shaft (305) is fixedly connected to the output end of the stirring motor (302); and a pressure relief valve (301) is arranged on the top of the stirring kettle (3).

4. A lithium battery production system, comprising a lithium battery electrode raw material feeding device as claimed in any one of claims 1 to 3, characterized in that: It also includes an electrode assembly device, the electrode assembly device includes a conveyor belt (5), an upper welding wire station and a welding station are arranged on the conveyor belt (5), a first detection device (9) is arranged between the upper welding wire station and the welding station, the first detection device (9) includes 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 computing device, the first top detector (901) and the first side detector (902) are respectively connected to the first computing device, and the first computing device has a built-in electrode position error formula.

5. The lithium battery production system according to claim 4, characterized in that: A material unloading station is arranged at the end of the conveyor belt (5), and a second detection device is arranged at the material 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 computing device. The second top detector (1601) and the second side detector (1603) are respectively connected to the second computing device, and the second computing device has a built-in electrode position error formula.

6. The lithium battery production system according to claim 4 or 5, characterized in that: The electrode position error formula is as follows: Where L is the error in 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 true box, and p is the penalty term for the aspect ratio.

7. The lithium battery production system according to claim 4, characterized in that: The upper welding wire station is provided with an upper welding wire machine (8) for setting welding wire at the welding point, and the welding station is provided with a welding machine (12) for welding batteries; the first screening belt (11) corresponds to the position of the first detection device (9), and a first screening robot (10) for transferring defective products is provided between the first screening belt (11) and the first detection device (9); the unloading station is provided with a good unloading belt (17) for transporting qualified products and a second screening belt (15) for transporting defective products, and a unloading robot for unloading is provided between the good unloading belt (17), the second screening belt (15) and the unloading station. A feeding robot (1602); a polarity detection device (13) for detecting the performance of the battery electrode 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 conveyor belt (5); a loading station for loading the battery shell is arranged at the head end of the conveyor belt (5), an upper electrode station is arranged between the loading station and the upper welding wire station, an upper electrode robot (7) for placing the electrode on the battery shell is arranged at the upper electrode station, and also includes an upper electrode belt (6) for transporting the electrode, and the terminal end of the upper electrode belt (6) corresponds to the position of the upper electrode robot (7).

8. The lithium battery production system according to claim 5, characterized in that: The first top detector (901), the first side detector (902), the second top detector (1601), and the second side detector (1603) are all X-ray detectors.

9. The feeding method of lithium battery electrode raw materials is as follows: Step 1: According to the formula, calculate the amount of material W that should be put into each storage tank (1) according to the following formula: Where V b is the volume of the inner cavity of the stirring tank (3), α is any ratio between [40%, 75%], S is the solid content of the desired slurry, P is the proportion of the material stored in each storage tank (1) in the proportion, and d is the density corresponding to the material stored in the storage tank (1); Step 2: opening the metering valves (101) of a plurality of the storage tanks (1) respectively, and feeding the materials into the stirring tank (3) according to the feeding amount W calculated in the first step; Step 3: The stirring motor (302) is started to stir the material and the fan (2) is turned on at the same time to send air flow into the stirring kettle (3). The wind speed at the air outlet (3041) is calculated according to the following formula: Wherein v is the wind speed of the air outlet (3041), and is controlled to be 3m / s≤v≤7m / s, Q is the flow rate of the gas, and A is the area of ​​the air outlet (3041); Step 4: After the stirring is completed, a slurry is obtained, and the slurry is transported to a coating device (4).

10. The assembly method of lithium battery electrodes is as follows: (A): A jig loaded with several battery shells is placed from the loading station; (B): When the jig passes through the upper electrode station on the conveyor belt (5), the upper electrode manipulator (7) transfers the electrode on the upper electrode belt (6) and installs it on the corresponding battery housing; (C): The conveyor belt (5) transports the jig to the upper welding wire station, and the upper welding wire machine (8) arranged at the upper welding wire station places the welding wire on the welding seam; (D): The conveyor belt (5) transports the jig 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 shell, and detect whether the position of the electrode is within an acceptable range through the electrode position error formula built into the first computing 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 electrode position L value is 0≤L≤0.05, the battery is transported to the welding station by the conveyor belt (5); if the electrode position L is 0.05<L≤1, the battery is transported to the first screening belt (11) by the first screening robot (9) for transportation; (E): The conveyor belt (5) transports the jig to the welding station, and the welding machine (12) installed at the welding station welds the electrode and the battery shell into one; (F): The conveyor belt (5) transports the jig to the polarity detection device (13), and the polarity detection device (13) detects the polarity performance of the battery welded on the jig; (G): The conveyor belt (5) transports the welded battery to the unloading station. The unloading robot (1602) grabs the battery and places it 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 electrode and the battery shell, and detect whether the position of the welded electrode is within an acceptable range through the electrode position error formula built into the second computing device. The electrode position error formula is as follows: Where L is the error in 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 for the aspect ratio. If the electrode position L value is 0≤L≤0.05, the good product unloading belt (17) will continue to transport it out. If the electrode position L value is 0.05<L≤1, the unloading robot (1602) will transfer the battery to the second screening belt (15).

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