702535 battery.Lithium-ion battery production process

　　1. First, weigh the plates inside each battery and assemble the plates. The capacity of each cluster must be equal, otherwise the group with a small capacity will be fully charged in advance due to its small capacity. Then the battery group with a large capacity has not yet been fully charged, the terminal voltage of the battery is low, and the total voltage has not reached the full end voltage. Charging, causing a group with a small capacity to become overcharged. If the battery is discharging, the group with a small capacity will lose its power in advance. The voltage of other battery terminals is higher, and the total voltage of the battery does not have the termination protection of electric boost. Voltage, discharge continues, causing the battery to over-discharge. Overcharging and over-discharging of the battery as well as untimely charging will affect the service life of the battery. However, the battery capacity of the battery group with the small battery further decreases. The decrease in battery capacity further causes the group to overcharge and over-discharge. This cycle causes the battery capacity to be very low. Soon it will be reduced and scrapped. 2. Before weighing the plate, it is necessary to clear the excess front edge, burrs, and excess active material during the paste production. If it is not clean, it will cause a short circuit of the battery plate, that is, the battery self-discharge. . Use a plate brush earphone to clean the excess impurities on the plate to facilitate welding to prevent false welding or false welding. It is necessary to select those with uneven electrode plates, serious powder removal, and electrode plates with holes. 3. How to weigh the plates? When weighing and assembling the plates, you must first weigh out some of the plates and place them on the workbench in order according to their weights, compare and mark the weights, and then weigh the plates that have not been weighed. The weight of each plate is weighed on the instrument. According to the weighed weight of the plate, it is placed together with the plate placed on the workbench, which saves some trouble. (The smaller the weight difference between each group of positive or negative plates, the better. The error between 10 and 14AH should not exceed 1 gram per group, and the error between 17 and 20AH should not exceed 2 grams per group. Pack the separator 1. The electrodes after weighing The plates are weighted and assembled according to the regulations. After being assembled, the plates are wrapped. The materials of the partitions are generally microporous rubber and glass fiber. When wrapping, pay attention to the cleanliness of the partitions. Place the polar plates in the middle of the partitions. If Align the positions of the electrode plates and place them in the plate box. 2. Wrap the positive plate in two pieces, and use very thin separators to hold only the positive plates together. Do not wrap the negative plates, so as to avoid single-piece separators. Short circuit caused by defects. Single-piece packaging board, use separators to pack only the positive plate and leave out the negative plate and put it in the packaging box, which is convenient and simple. Selection and processing of lead parts 1. Lead parts include lead welding rods and electrodes Columns are cast from special molds. Generally around 450°C, if the temperature is too high, the lead will be seriously oxidized, and the lead parts will cause cracks due to severe shrinkage. It is not allowed to use iron tools to knock the molds. Try to ensure that there are no burrs around the lead parts. , if any, need to be trimmed. 1. Cluster welding, welding is to solder the positive and negative electrodes together with lead to form a cluster, and use oxygen-acetylene as a tool to connect the poles and the busbar. 2. Place the wrapped electrode plates in the cluster box. After inserting the electrode plates in the cluster box into the comb plate, insert the negative electrode first and then the positive electrode so that the pole tabs are fully inserted into the comb plate. If there are any imperfections, sort them out manually. , and then put the bars, bridge posts, and poles between the positive and negative electrode lugs. 3. Turn on the acetylene and oxygen in the welding gun and ignite it, and adjust it to the appropriate size. Move the welding gun and welding rod to the position of the electrode lugs, and then Melt the lead bars and tabs, and after the busbar is basically welded, weld the poles and the busbar together. If there are impurities such as lead ash during welding, false soldering or false soldering will be found, and the poles will Welding with the busbar is a key process in the production process. The welding must be firm and without false welding or false welding. At this time, impurities must be removed while welding, and finally the busbar must be filled. 4. After welding the busbar , check that there are no defects and then enter the slotting process. Generally, the cluster with terminals should be installed first, and then other clusters. The positive and negative electrodes are arranged as +-, +-, +-, +-, +-, + - Connect in series, and do not install the wrong polarity. When installing the polar plate in the slot, be sure to install it to the bottom, and then check whether the bridge column is normal. If there is any displacement, handle it manually. After the trial installation, whether the upper cover can be closed is basically The cluster lowering slot has been completed. 5. How does Jiqun check it? First, we use a multimeter to measure whether the battery is short-circuited. If the voltage during measurement is zero or close to zero, it proves that the battery is short-circuited. Check the cluster to find out the location of the short-circuit and repair it. Check if there is no short circuit, the positive and negative poles of the multimeter are connected properly, and there is no negative number in the displayed voltage. If so, prove that the polarity is reversed, and then reinstall it into the battery slot. 6. There is no fault after the plate detection When it comes to bridge welding, Jiqun welding is a key item. Use bridge welding to clamp the column, and use oxygen welding to weld the bridge column. During welding, make sure the flame does not burn the battery case, and ensure that there are no false welds or false welds. , the poles are separated from the cluster, and the cover can be closed smoothly. To seal the battery cover, use epoxy resin glue and curing agent in a ratio of 2:1. The prepared glue should be used in time to avoid it taking a long time to solidify. The solidification of the colloid has a great relationship with the temperature. The higher the temperature, the faster it solidifies, so it should be used as soon as possible. There is also heating equipment for capping. 7. After the battery cover is completed, the poles must be welded to check whether the led poles are in the middle of the lead holes. If not, they must be corrected. Put the pole mold on the lead pole and then use oxygen welding to melt the pole. There is also a kind of welding. Place the terminal on the lead pole in the correct position. Use a soldering iron to melt the solder wire and solder the terminal and pole together. When welding, pay attention to false welding and false welding. Method 1: Use special solvents and adhesives to make slurries and mix them with powdered positive and negative active materials respectively. After stirring evenly at high speed, slurry-like positive and negative materials are made. Method 2: Coating: Evenly apply the slurry on the surface of the metal foil, dry it, and make positive and negative electrode sheets respectively. Method 3: Assemble the positive electrode sheet - separator - negative electrode sheet - separator They are placed in order from top to bottom, and then rolled to form the battery pole core. Then, through the process of injecting electrolyte, sealing, etc., the battery assembly process is completed and the finished battery is made. Method 4: Use special battery charging and discharging equipment to conduct charge and discharge tests on the finished batteries, test each battery, and select qualified finished batteries to be shipped out. With the rapid development of electric vehicles and automobiles, with the rapid development of electric vehicles and automobiles, Vehicle power supplies have also developed rapidly, but there are many problems in the production of batteries, resulting in uneven quality of battery products on the market. The capacity of the battery and its cycle life in the later period cannot reach the designed service life. This is due to the battery's The production has a great relationship with its unique production process. The structure of the battery consists of outer casing, upper cover, polar plates, separators, busbars, poles, bridge protection plates, terminals and other components.

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