BYD, Xiaomi Lead China EV Tech Into Next Phase

China’s electric vehicle industry is pushing deeper into the core technologies that will define the next competitive era: battery durability, self-developed chips, and smarter sensor architectures. In the latest developments, BYD’s Yangwang U7 completed a 30,000 km high-speed endurance test with just 1.3% battery capacity loss, Xiaomi unveiled China’s first self-developed 3nm intelligent driving chip, and chipmaker Novosense highlighted how next-generation ultrasonic radar is evolving for advanced parking and low-speed safety applications at the APEC Automotive Dialogue in Dalian. Together, these stories show how Chinese EV players are moving beyond price competition and into a more demanding battle over reliability, vertical integration, and intelligent driving performance.

BYD Yangwang U7 Puts Battery Durability in the Spotlight

BYD’s ultra-premium Yangwang brand used a dramatic real-world-style test to underline how far China’s EV battery technology has progressed. On August 25, Yangwang said the production-spec 2026 U7 battery-electric sedan completed a 30,000 km endurance run in 8 days, 19 hours, and 58 minutes.

According to the company, the test took place in Nanning, where average temperatures exceeded 36°C and humidity reached 80%. The car reportedly maintained a continuous 240 km/h cruising speed, with the air conditioning set to 24°C throughout the run.

The headline figure, however, was battery health. After more than 350 flash-charging cycles in just 9 days, the U7’s battery capacity retention remained at 98.7%, implying only a 1.3% decline.

Key takeaways from the U7 test

• Vehicle: 2026 Yangwang U7 pure electric sedan
• Starting price: about USD 95,400 in China
• Battery tech: BYD Blade Battery 2.0
• Distance covered: 30,000 km
• Test duration: 8 days, 19 hours, 58 minutes
• Charging events: 350+ flash charges
• Battery retention after test: 98.7%
• Pre-launch validation fleet: 758 vehicles
• Total real-world validation mileage: 10.49 million km

Yangwang General Manager Hu Xiaoqing stressed that the car was a standard production vehicle randomly selected from a retail outlet, not a specially prepared prototype. That matters because Chinese regulators are tightening expectations around reliability claims.

China’s Reliability Rules Are Getting Tougher

BYD’s test did not happen in a vacuum. It comes as China raises the bar for formal reliability verification across the auto industry.

In January 2026, the Ministry of Industry and Information Technology (MIIT) revised vehicle access review requirements, with the new rules set to take effect on January 1, 2027. Under the updated framework, traditional vehicles must complete at least 30,000 km of reliability verification. Proposed revisions released for public consultation in July would align new energy vehicles with that same threshold.

Proposed China reliability test standards

This is a notable shift. For years, Chinese EV competition was centered on acceleration, range, and software features. Now, regulators are signaling that durability and validation depth must become equally central.

That is also why BYD’s battery retention figure matters. Even if such a manufacturer-run test should be viewed with some caution until independently verified, it reinforces a broader point: for top-tier Chinese EV makers, battery longevity is increasingly becoming a proof point rather than a weak spot.

Xiaomi Enters the Self-Developed Chip Race

If BYD’s news was about proving hardware endurance, Xiaomi’s announcement was about controlling the intelligent driving stack.

Xiaomi has unveiled the Xring D100, described as China’s first self-developed intelligent driving chip built on a 3nm process. That places Xiaomi in a fast-growing group of Chinese automakers pursuing proprietary silicon, alongside BYD, Nio, Xpeng, and Li Auto.

Current Xiaomi SU7 and YU7 models use Nvidia solutions rated at around 700 TOPS of computing power. The new D100 is positioned as a high-compute AI chip for advanced autonomous driving, with estimated performance of 700 to 1,000 TOPS.

Xiaomi Xring D100: reported specs

• Process node: 3nm
• CPU: 20-core high-performance CPU
• NPU: 16-core high-compute NPU
• Memory support: up to 160GB
• AI model capability: local deployment for models up to 200 billion parameters
• Estimated compute: 700–1,000 TOPS

The technical significance is only part of the story. Strategically, Xiaomi wants to own more of the value chain, from the chip itself to the domain controller and the underlying BSP software. That could reduce supplier dependence, lower BOM costs over time, and allow tighter optimization for Xiaomi’s XLA end-to-end intelligent driving model.

Why In-House Chips Matter for Chinese EV Brands

Chinese automakers are no longer content to assemble best-of-breed components from external suppliers. Increasingly, they want to co-design or fully control the key building blocks of software-defined vehicles.

Benefits of self-developed automotive chips

• Cost control: reduced supplier markup at scale
• Performance tuning: chip architecture can be optimized for a brand’s own perception and planning stack
• Faster iteration: hardware and software roadmaps can be aligned internally
• Supply chain security: less exposure to external allocation risks and export restrictions
• Brand differentiation: proprietary silicon can become a competitive moat

Still, chip development is not easy. Automotive-grade certification, thermal validation, long-cycle durability testing, and deep software integration remain major hurdles. CarNewsChina noted that Xiaomi’s D100 still needs large-scale validation before series deployment, and it remains unclear which model will receive it first. The most optimistic estimate is a future updated YU7.

The economics are also harsh. Xiaomi’s move makes sense partly because it now has scale: the company delivered 80,856 vehicles in Q1 and 104,199 in Q2, and previously set a 550,000-unit delivery target for 2026. Without such volume, the multi-billion-yuan investment needed for chip R&D becomes difficult to justify.

Smarter Ultrasonic Radar Shows the Next Layer of ADAS Evolution

While headlines often focus on lidar, cameras, and AI chips, short-range sensing remains essential for real-world advanced driver assistance systems. That was the message from Novosense Microelectronics at the 44th APEC Automotive Dialogue (AD44), held in Dalian from August 19 to 21, 2026.

At the event, Novosense presented its AK2 ultrasonic radar chip direction, arguing that ultrasonic sensors are moving from traditional analog architectures to more capable digital architectures.

Compared with the older AK1 analog approach, AK2 uses digital coded modulation and echo signal processing, improving:

• Detection range
• Measurement accuracy
• Interference resistance
• Multi-sensor coordination

The newer architecture is already aimed at applications such as:

• UPA (ultrasonic parking assist)
• APA (automatic parking assist)
• AVP (autonomous valet parking)

From Parking Aid to Multi-Dimensional Near-Field Perception

Novosense’s presentation is a useful reminder that intelligent driving is not just about compute power. Sensor fusion at low speed is becoming more sophisticated, especially as automakers push hands-free parking and low-speed active safety.

The company outlined several technology trends shaping ultrasonic sensing:

1. Broader functionality

Ultrasonic sensing is evolving from 1D/2D ranging toward 3D/4D perception, with potential use in:

• Low-speed AEB triggering
• Obstacle type recognition
• Road surface classification
• Minor contact detection

2. Faster refresh rates

Bumper-level sensing cycles are being compressed to under 100 milliseconds, enabling earlier obstacle recognition and more efficient AVP operation.

3. Richer raw data access

Sensor ICs are increasingly expected to upload raw data for:

• Target classification such as vehicles, pedestrians, and curbs
• Road surface identification such as paved road, gravel, and grass
• Sensor contamination detection including water, mud, ice, and snow

4. Lower system cost

Cost reduction is shifting from module-level thinking to system-level optimization, including:

• MCU elimination
• DSI3 two-wire architecture for power and communication
• Direct-drive designs without external transformers

This matters because Chinese automakers are trying to scale advanced parking and low-speed ADAS features across broader vehicle lineups, not just premium flagships.

DSI3 and Digital Ultrasonics Could Improve Interoperability

One of the more practical points from Novosense’s presentation was its emphasis on the standard DSI3 protocol. In automotive electronics, interoperability often matters as much as raw performance.

According to the company, its ultrasonic solution supports cross-brand interoperability with other standard DSI3 chips and multiple topologies including:

• Point-to-point
• Parallel
• Daisy-chain

Novosense also highlighted configurable raw data uplink options and a detection range covering roughly 10 cm to 6.5 meters. A time-varying low-noise amplifier was cited as a way to suppress near-field saturation.

For automakers, that points to a broader trend: sensor hardware is becoming more software-defined, with richer data pipelines feeding centralized compute platforms.

Comparison: Three Signals From China’s EV Tech Race

Global Implications

These developments have significance far beyond China.

First, they show that Chinese EV competition is maturing. The conversation is moving from headline-grabbing range claims to the harder engineering questions of durability, validation, compute architecture, and sensor integration.

Second, they suggest Chinese companies are expanding control over the most strategic parts of the vehicle stack:

• Batteries and cell chemistry
• Autonomous driving chips
• Sensor ICs and communication architectures
• Vehicle software and domain controllers

Third, this trend could reshape the supplier landscape globally. International Tier 1s and chip vendors may face more pressure as Chinese automakers and domestic semiconductor firms develop alternatives in-house or within local ecosystems.

Finally, stricter Chinese reliability rules could become a competitive benchmark. If China’s EV leaders can meet tougher validation standards while maintaining aggressive pricing and rapid innovation cycles, that combination will be difficult for global rivals to match.

Why This Matters

For consumers, the message is reassuring: Chinese EVs are increasingly being engineered not just to impress on launch day, but to hold up under heavy use.

For the industry, the message is more disruptive. BYD is proving battery confidence at the premium end, Xiaomi is chasing tighter control over intelligent driving hardware, and suppliers like Novosense are upgrading the less glamorous but essential sensing layers that make automated parking and low-speed safety work reliably.

In short, China’s EV race is entering a more technical phase. The winners may not simply be those with the biggest screens or the lowest prices, but those that can combine validated durability, proprietary silicon, and scalable ADAS hardware into a coherent product strategy.

What to Watch Next

Over the coming months, several questions will be worth tracking:

• Will independent third parties validate Yangwang’s U7 battery durability claims?
• Which production Xiaomi model will debut the Xring D100?
• How quickly will digital ultrasonic architectures spread from premium vehicles to the mass market?
• Will China’s tighter reliability framework push other brands such as Nio, Xpeng, Li Auto, and Zeekr to disclose more long-cycle testing data?

One thing is already clear: in China’s EV market, the center of gravity is shifting from visible features to invisible engineering. That is usually the clearest sign that an industry is growing up.