According to Tianyan Research, the utility model patent for the “safety limit structure, force limit lock mechanism, seat and vehicle” applied for by Shanghai Ideal Auto Technology Co., Ltd., a wholly-owned subsidiary of Beijing Ideal Auto Co., Ltd., was authorized on October 16, and the current legal status is valid. The summary shows that when the tensile force is insufficient to overcome the resistance, the reel remains fixed; during collision, the tension increases and the resistance is overcome, and the reel rotates to release the belt or lock connector to absorb some energy and cushion the impact. Tianyan inspection also revealed that BYD Co., Ltd.'s patent for “a seatbelt force limit system, seat assembly and vehicle” was announced on October 16 and is still under review. The scheme switches the force limit state according to the seat backrest angle: when the backrest angle reaches or exceeds a preset threshold, the force limit value is lower than the level when the angle does not reach the threshold value.

According to Tianyan Research, the “safety limit structure, force limit lock mechanism, seat and vehicle” utility model patent applied for by Shanghai Ideal Auto Technology Co., Ltd., a wholly-owned subsidiary of Beijing Ideal Auto Co., Ltd., was authorized on October 16, and the current legal status is valid. The summary shows that when the tensile force is insufficient to overcome the resistance, the reel remains fixed; during collision, the tension increases and the resistance is overcome, and the reel rotates to release the belt or lock connector to absorb some energy and cushion the impact. Tianyan inspection also revealed that BYD Co., Ltd.'s patent for “a seatbelt force limit system, seat assembly and vehicle” was announced on October 16 and is still under review. The scheme switches the force limit state according to the seat backrest angle: when the backrest angle reaches or exceeds a preset threshold, the force limit value is lower than the level when the angle does not reach the threshold value.