Analyze patent applications for lithium battery separators

Lithium battery diaphragm patent application 1 Overview of lithium battery diaphragm patent applications 2,124, the specific distribution is shown in Figure 1. As can be seen from Figure 1, there are 1793 applications for invention patents and 331 applications for utility model patents. There were a total of 1148 local applications (54 cases) from the applicant country and a total of 976 overseas applications. The number of domestic patent applications is greater than the number of foreign patent applications, but it is worth noting that the proportion of domestic patent applications is relatively high, and the technical content and innovation level of utility model patents are lower than that of invention patents. 2 Application trend In order to know the changing trend of the number of patent applications in my country's lithium battery separators, the total number of applications, the number of invention patent applications and the number of utility model patent applications are based on the application program, and the calculation results are shown in Figure 2. The number of patent applications is the sum of the number of invention patent applications and the number of utility model patent applications. It can be seen from Figure 2 that from 1985 to 2002, the number of applications of lithium battery separators was small, and the increase was slow, with dozens of applications per year. From 2003 to 2011, the number of applicants increased rapidly. From 2012 to 2013, the number of patent applications declined, which was related to the undisclosed number of patent applications. Invention patent applications account for a large proportion of the number of patent applications, and their changing trend with age is basically the same as that of the number of applications. Before 2002, the number of utility model patent applications was very small, and it was not until 2009 that it began to rise rapidly. The decline in the number of utility model patent applications in 2013 may also be related to the undisclosed part of the applications. It can be seen from Figure 1 that utility model patent applications are mainly filed by domestic applicants. The changing trend of the number of patent applications for lithium battery separators reflects the development of lithium battery manufacturing technology to a certain extent, especially the increase in the scale of domestic lithium battery processing. Early lithium batteries were mainly used in 3C products, and the demand for lithium battery separators was relatively simple. The processing of lithium battery separators was mainly monopolized by several foreign manufacturers. The development of dynamic lithium batteries puts forward higher requirements on the separators of lithium batteries. Since 2002, my country has gradually become an important processing country for lithium batteries. Domestic companies have also begun to develop and process lithium battery separators, and related patent applications have also been added. 3. Regional distribution of application programs In order to know the status of foreign applicants applying for lithium battery diaphragm patents in my country, statistics are made based on the country of origin of patent applicants. The statistical results are shown in Figure 4. It can be seen from Figure 4 that most of the applications for lithium battery separators abroad come from Et, and the number of patent applications is 570, accounting for 58% of the number of foreign applications. South Korea, the United States and Germany received 176,123 and 77 applications respectively. The rest came from France, Italy, Canada, Sweden, and the United Kingdom, but the number was not large. The distribution of domestic applicants is calculated according to the province (city) where the domestic applicants are located, and the results are shown in Table 1. As can be seen from Table 1, patent applications for lithium battery separators in my country are mainly concentrated in Guangdong, Jiangsu, Zhejiang, Shanghai, Beijing and Tianjin. The number of applications in Guangdong Province is 410, which is significantly higher than other regions. In addition, 12 provinces including Shandong, Fujian and Henan also have a certain number of patent applications for lithium battery separators, while the number of applications in 9 provinces (regions) including Hebei and Jilin is less than 10. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: Application of lithium iron phosphate battery in microgrid energy storage system