lithium battery

The manufacturing level of a battery directly affects the value of the battery in use. In order to meet the needs of the new energy vehicle and energy storage application market, the manufacture and supply of high-quality batteries is particularly important best lithium ion battery machine company. So, how should the level of battery manufacturing be measured?

Battery technology manufacturing follows the basic economic laws of large-scale manufacturing, can be measured by eight indicators.

1. Battery manufacturing pass rate

Definition: The ratio of the number of batteries meeting the operating characteristics to the total number of batteries put in at the beginning. Battery operating characteristics refers to the basic characteristics of the battery to meet the requirements of the use of the battery,equipment for lithium battery assembly generally refers to the basic performance of the battery and to meet the capacity, internal resistance, amplification, size, self-discharge and safety and other conditions combined.

The definition of usage characteristics varies at different stages of battery manufacturing and in different application scenarios after the battery is completed. The subdivided battery manufacturing qualification rate includes:cell manufacturing qualification rate, module manufacturing qualification rate, pack manufacturing qualification rate, and cell pairing qualification rate.

For the cell manufacturing enterprises, they should focus on emphasizing the cell pairing pass rate, i.e. the number of cells meeting the pairing use divided by the number of cells put into the manufacturing start. It reflects the comprehensive level and efficiency of the battery cell manufacturing enterprises, the current industry data is not high, good enterprises in 90% to 95%, the general range of enterprise data is in 75% to 85%.

2. Material utilization rate

Definition: The ratio of the material research value of the actual work output molding battery to the value of all resource-consuming materials used to input the same number of batteries.

Here all these materials mainly include the existence of finished products in the molding battery cost constitutes a material and manufacturing process with the output into a certain proportion of the consumption of auxiliary materials, such as N-methyl pyrrolidone (NMP), water, material joints, connecting tape tape, the material can be volatilized to consume liquids, protection of the Mylar film, the process of manufacturing is the protection of the gas and so on.

At present, the average level of this indicator in the industry is 90% ~ 94%, there is still a lot of room for improvement, from the battery design, manufacturing technology, manufacturing equipment and manufacturing management to comprehensively improve the level of material utilization, you can realize the resource savings for the battery manufacturing enterprises to bring more profits.

3.Labor cost rate

Definition: In a certain continuous production cycle, directly inseparable from the battery production process, the cost of production personnel and the proportion of the same period of production of battery capacity, unit: yuan / W-h.

Production staff includes operators, material transportation staff, fixed inspection staff, maintenance staff, excluding temporary staff, such as maintenance staff, unscheduled product replacement and product line optimization and improvement staff.

4. Watt-hour equipment input

Definition: The ratio of depreciation of all equipment inputs to the electrical energy (W - h) of the current production profile of the battery in a given continuous production cycle, in units of $/w - H. The depreciation period is related to the life cycle of the battery production product.

Depreciation period with the battery production product life cycle, according to the financial management of fixed asset depreciation law can be combined with the characteristics of the battery manufacturing industry and a comprehensive analysis of the consideration, generally 5 to 8 years.

5. Watt-hour energy consumption index

Definition: all the energy consumed in the process related to the production of batteries (W - h) and the given continuous production cycle in the production of batteries have been formed in the watt-hour (W - h) ratio, expressed as a dimensionless coefficient. All energy consumed shall be converted to a uniform unit of W - h. This includes electrical energy consumed by manufacturing equipment, construction of the manufacturing environment, manufacturing support gases, production management personnel, and hot steam and fuels used in direct production, but excludes energy consumed in cell research and development, experimental research, and cell production validation not related to large-scale continuous production.

6. Watt-hour manufacturing cost

Definition: in a certain can be continuous production cycle (generally a cycle of the battery's manufacturing), the consumed manufacturing costs and during this period of social production of formed battery watt-hour (W-h) ratio, unit: yuan / W-h. All resources consumed by the management costs mainly include three: during the period of labor costs, during the period of energy consumption costs and during the period of depreciation of equipment (generally are in accordance with the average depreciation of 5 to 8 years).

7. Manufacturing safety

Definition: Battery product manufacturing safety, in a continuous production cycle (one month or half a year), the loss of thermal control or exceed the safety standards of the number of batteries and the total number of batteries produced during the period multiplied by the ratio of 1 million, known as the PPM number (parts per million).

The general cell production safety index should be less than a few PPM, called PPM level control. Battery pack production safety indicators should be less than a few PPB (parts per billion), known as PPB level control.

8. Operation Reliability

Definition: MTBF refers to the battery technology manufacturing production line (or single-process equipment) of the average trouble-free working time, operation and reliability analysis can generally require a single machine MTBF greater than 1,000h (DT less than one in 10,000), the production line overall MTBF greater than 150h.

Breaking down the battery manufacturing pass rate, there is also an indicator of battery yield. It is defined as the percentage of the number of qualified cells entered in the manufacturing process, from the battery material to the battery pack.

The determination of battery manufacturing pass rate, material utilization rate, labor cost rate, watt-hour equipment investment, watt-hour energy consumption index, watt-hour manufacturing cost, manufacturing safety and operational reliability, and battery yield rate will change the judgment of battery manufacturing level from qualitative to quantitative. With the development of intelligent manufacturing, the importance of indicators will become increasingly prominent, and become an objective basis for measuring and improving the quality and manufacturing level of batteries.

Battery as a general product, its material scale is varied, the manufacturing process from continuous to discrete, semi-finished products show a variety of states, dynamic processes are mixed with each other, physical fields are many, and environmental factors can add more instability. Due to the complexity of its theory, mechanism and manufacturing process, it can only define the basic metadata and data dictionary of incoming materials, equipment and process, accurately acquire data according to the law, organize the data, establish a data platform, and build a model reflecting the actual law in order to achieve the manufacturing goal, and then optimize the manufacturing goal according to the needs of the manufacturing goal.

It is difficult to manufacture high-quality power batteries without long-term accumulation and a deep understanding and mastery of the mechanism and laws affecting batteries.

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