The charging speed is already very fast, and the “fast-filled ancestor” has a showdown first

If you pay attention to the development of mobile phone charging technology, you will probably know that every July in the middle of the year is the day when OPPO holds the flash charging open day. According to the past rhythm, higher fast charging power is usually refreshed in this event.

Judging from the official information and warm-up posters of the previous two days, this year’s OPPO flash charging open day is different: the theme is still last year’s “More than Fast”, but the new record of charging speed is not continued. Instead, we have to talk. Talk about things other than “fast”.

On July 22, OPPO “father of flash charging” Zhang Jialiang took to the podium: this time it released low internal resistance fuses, gallium nitride electronic switches, internal series double cells, battery safety detection chips and sandwich safety batteries, etc. A series of safety-related innovative technologies.

The charging speed is already very fast, and the "fast-filled ancestor" has a showdown first

With the emergence of fast charging of one hundred watts and the ubiquitous power competition, OPPO talks about safety during the annual flash charging open day. What new signal is it sending?

As a leader in fast charging technology, OPPO can be said to have personally started the fast charging era in the mobile phone industry. But in the power competition of the past two years, the high charging speed for a while is no longer the main concern of users. In the post-fast charging era, charging speed/power will no longer be the only benchmark for measuring technological advancement. What users really need is a new experience of safer, smarter, burden-free charging anytime and anywhere, and calmly using electricity.

People-oriented fast charging is not about changing speed with safety

In 2014, when the industry was still “entangled” with large-capacity batteries, OPPO took the lead in self-developed fast charging and broke the “tortoise speed charging” of “five blessings and one safe”, opening the era of fast charging. Subsequently, various manufacturers have also followed up with fast charging, gradually increasing its speed.

If the charging itself is regarded as a system, then this system is composed of a series of components such as a charging adapter, a cable, a PMIC integrated power management circuit, and a battery terminal. The charging speed itself is to optimize each node of this link one by one to achieve more efficient efficiency.

Pinwan also introduced before that wired fast charging is essentially to solve three problems: the charging performance of the battery itself-achieved by improving the structure and introducing new materials; the efficiency of the charging process-by increasing the current or voltage to achieve more High energy conversion efficiency, but the entire charging architecture needs to be adjusted behind the scenes; and a very important safety issue to ensure temperature control and stability during the charging process-this requires the design of sufficient heat dissipation and over-temperature protection.

In the infinite pursuit of high speed, that is, in the process of pursuing high-power digital, the introduction of technologies such as multiple cells and charge pumps can indeed increase faster speeds. But this may also bring some negative “consequences”, such as ignoring product safety features, which may bury hidden dangers. In addition, the incompatibility of the proprietary fast charging protocols of different manufacturers has also greatly increased the user’s cost of use, and the mixed use of chargers with different protocols and mobile phones has also planted security risks.

In OPPO’s view, people-oriented fast charging is not blindly pursuing charging speed or power indicators, but to establish a sufficiently solid safety foundation first. With this as a prerequisite, we can better support the development of fast charging technology. In the case that it is difficult to establish uniform industry standards, charging power should not be the only indicator used to measure technological progress, and users should not be trapped by power competitions and forced to “change speed with safety.”

Reviewing the development of OPPO VOOC flash charging, it is not difficult to find that OPPO has introduced five safety protection measures at the beginning of the flash charging design, including adapter overload protection, flash charging condition determination protection, interface overload protection, battery overload protection and battery fuse Protection and other technologies also reflect OPPO’s forward-looking nature in the field of security technology to a certain extent.

Today, OPPO has refocused on security technology, in fact, it can be regarded as continuing to play “traditional arts”.

Among the latest series of safety technologies, the on-site test of the “sandwich safety battery” is the most eye-catching. This battery, which uses a new structural design and a new composite material, can withstand the test of extreme tests such as acupuncture, heavy blow, etc., without fire or smoke. Compared with traditional lithium batteries, “sandwich safety batteries” can physically isolate the safety risks caused by external force damage.

The charging speed is already very fast, and the "fast-filled ancestor" has a showdown first

For the inside of the battery, OPPO brought a dedicated battery safety detection chip this time, which can act as a detective and promptly remind users to repair or replace when an abnormal internal state is detected.

Fast charging evolution model: VOOC flash charging ecology

The major premise of safety is guaranteed, but what about afterwards?

The National Telecommunications Terminal Industry Association actually gave a direction. In May, the Telecommunications Terminal Industry Association issued the “Mobile Terminal Convergence and Fast Charging Technical Specification”. The UFCS protocol proposed by it believes that a set of interaction flow specifications for mobile phones, cables, and chargers should be specified. The main purpose is to solve different charging Compatibility of facilities.

On the one hand, the continuous growth of private agreements has indeed caused the interoperability of the fast charging technologies of various brands-switching to the user side, a “dual-machine” EDC user does need to be equipped with two sets of chargers every day, after all Once you leave the original charging adapter, the charging experience will be greatly reduced.

But it needs to be acknowledged that the current industry general charging agreement is indeed difficult to establish, and it is also a process that requires transition. Therefore, this also contributed to the rapid development of the flash charger ecosystem.

Since the release of OPPO VOOC flash charging technology in 2014, it has continuously improved charging efficiency through customization and optimization of software, hardware and algorithms, leading the development of fast charging technology in the industry.

It is precisely in order that users can use OPPO VOOC flash charging technology more conveniently in different scenarios. OPPO has begun to open VOOC flash charging technology patent authorization to industry partners since 2018.

OPPO has also united with charging equipment manufacturers, automotive OEMs, and upstream chip companies to create flash charging high-frequency charging scenarios for homes, offices, cars, and public places to meet consumers’ all-weather, multi-terminal, and multi-scenario charging needs.

Under the premise that it is difficult for the industry to establish a unified standard, OPPO’s leadership in charging technology is indeed to build a set of own technical ideas-under the premise of absolute safety, the pursuit of wired speed and wireless speed, after wireless speed The compatibility of wired flash charging adapters is pursued, and after compatibility, there is a larger flash charging ecosystem.

On this flash charging open day, OPPO has made more explorations in smart charging technology.

The charging speed is already very fast, and the "fast-filled ancestor" has a showdown first

The so-called smarter is to go to the lower level of charging technology. In the past, the charging algorithm was only based on the judgment of the battery voltage and mechanically adjusted the charging current. But in fact, the magnitude of the charging current that the battery can accept is strongly related to the negative electrode potential. The industry believes that the negative electrode potential is one of the key factors that affect the amount of active lithium, so how to detect and control the negative electrode potential becomes the key. OPPO’s innovative smart charging technology can detect and control the negative electrode potential in a reasonable range in real time, and intelligently dynamically regulate the charging current to maximize it.

The exploration of these technologies is also derived from the huge amount of battery performance data that OPPO has tested in the laboratory for several years. The accuracy of the battery model is constantly revised to achieve real-time tracking of the battery’s negative electrode potential, even if the battery is aging.

Specific to actual scenarios, with the support of smart charging technology, the system can automatically determine the optimal charging strategy in the current scenario. For example, when waiting at the airport, there is only a few dozen minutes of charging time. Smart charging technology can automatically identify the current demand, activate the high-power fast charging mode, and maximize the power supply. At night, the system will automatically enter the “life extension mode”, slowly returning blood to the battery. According to OPPO’s estimation, this technology can significantly improve battery life, and can maintain 80% of the nominal capacity after 1500 cycles of charging and discharging, far exceeding the national standard.

Facing the era of IoT integration, many people also own IoT products such as TWS headsets, bracelets/watches in addition to mobile phones. This means that the charging scene in daily life will become more and more instantaneous and fragmented, but the incompatibility of fast charging protocols, inconsistent interfaces, and lack of security guarantees have long affected the charging experience of users.

If the industry is still developing in the direction of power competition, it is likely to be more and more distant from the real needs of users.

A typical example is the sharing of power banks. My friends often complain about the shared power bank in the shopping mall. The reason is that every time I use it, I feel that the charging speed has returned to the pre-liberation period, but I must endure its “low cost and high price”. Can mobile phone manufacturers develop safer and more portable power banks for users to use? For example, referring to the idea of ​​MageSafe external battery, launch a magnetic fast charging power bank?

Out of the more cutting-edge exploration of charging technology, OPPO put forward the slogan “Everything can be flashed” last year, and through further opening up the patent authorization of flash charging, to build an open and cooperative partnership.

At present, more than 40 manufacturers and supply chain partners have joined the OPPO VOOC flash charging ecosystem, and have or plan to launch highly compatible flash charging ecological products, so that more consumers can experience the convenience and fun of VOOC flash charging technology .

From an industry perspective, as OPPO, as a fast charging leader, focuses on the underlying security technology and brings new ecological ideas on the flash charging open day, it is more like a “showdown” of the power competition in the mobile phone industry. OPPO must be based on a sufficiently safe new structure to further open up the imagination of fast charging technology, and promote the development of the industry and technology in a more scene-oriented, smarter, and more ecological direction.

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