In recent years, patent infringement disputes in the new energy battery and photovoltaic sectors have become particularly prominent, with the series of lawsuits between Contemporary Amperex Technology Co., Ltd. (CATL) and CALB Group being a typical example. In January 2025, CATL once again filed a lawsuit against CALB with the Hangzhou Intermediate People's Court, accusing it of infringing a utility model patent related to secondary battery cover components, with a claimed compensation amount as high as 91 million yuan. This case represents the latest development in the years-long patent war between the two sides. Previously, CATL had initiated a total of 6 lawsuits, with the aggregate claimed compensation exceeding 700 million yuan.

The calculation method of patent infringement in China .

1. shall be determined based on the actual losses of the right holder:

2.shall be determined based on the profits obtained by the infringer

3.It is determined by referring to the multiple of the licensing fee

4.Statutory compensation

5.Agreed compensation 

How to collect evidence for patent infringement ？

Evidence of infringement

1.products include packaging and instructions

2purchasing infringing products

3 Collect the production records, sales contracts, invoice

4. Promotional evidence

5. On-site evidence of infringemen

6Technical comparison evidence

6. Witness testimony

 If my patent is invalidated， what should i do ?

Defense against procedural issues

Defense against substantive issues 

What is the protection period of patents in China?

Invention patent right: The term is 20 years

Utility model patent right: The term is 10 years.

Design patent right: The term is 15 years.

How much does it cost to invalidate a patent?

1. Official Fees

Invention Patent: ¥3,000 

Utility Model or Design Patent: ¥1,500 each 

Contract US：

Ms.Susan

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Email: info@guocaishangbiao.com