"Stop purchasing lead-acid batteries and vigorously promote the cascade
utilization of lithium batteries." In February this year, China Tower's official
statement was tantamount to a blockbuster thrown into the lithium battery
industry.
But in fact, China Tower revealed that the company had stopped purchasing
lead-acid batteries as early as 2018 and uniformly purchased tiered-use
batteries. As of the end of 2018, the company has used approximately 1.5GWh of
ladder batteries in approximately 120,000 base stations in 31 provinces and
cities across the country, replacing approximately 45,000 tons of lead-acid
batteries.
The energy storage of communication base stations not only opens up a new
market for the cascading use of lithium batteries, but also creates an
opportunity for an explosion of demand for BMS manufacturers supporting lithium
batteries.
Gaogong Lithium Battery (WeChat public account: weixin-gg-lb) learned that
as the earliest BMS partner of China Tower, in 2018 alone, Shenzhen Tianbangda
Technology Co., Ltd. (hereinafter referred to as "Tianbangda") More than 150,000
sets of BMS products have been shipped, accounting for over 50% of the tower
market segment. At the same time, Tianbangda has also reached strategic
cooperation with several domestic giants of traditional communication lithium
batteries, and has achieved fruitful results in the field of communication base
station energy storage BMS.
According to Hu Longwen, general manager of Tianbangda's new energy
business unit, the company's ability to have its own place in the communication
base station energy storage BMS market is closely related to the company's
long-term persistence in R&D investment and years of deep cultivation in the
field of communication base station BMS. Tianbangda established a communication
base station BMS team in 2012. In 2015, it participated in the pilot project of
replacing lead-acid batteries with cascade lithium batteries as the first batch
of tower pilot units.
Years of precipitation and dormancy, while benefiting from technological
innovation and the adjustment of China Tower's overall strategy, have
contributed to Tianbangda's qualitative change.
Hu Longwen believes that it is now economically feasible for China Tower to
switch to using lithium batteries for communication base station energy storage.
The current price of lead-acid batteries is about 0.6 yuan/wh, and the price of
tiered lithium battery group systems reaches 0.68 yuan/wh. Although the latter
is slightly more expensive, it has several outstanding advantages:
❶ is the service life. Compared with the more than 100 deep cycles of
lead-acid batteries, the cascade utilization of lithium batteries can reach at
least 400-600 times and more, with a longer service life. In terms of unit cost,
the latter is more economical;
❷In special scenarios, lithium batteries are more economical. For example,
in ecological reserves such as Xishuangbanna, Yunnan, the local government often
imposes power outages and gate restrictions every summer in order to protect the
ecological environment. The service life of traditional lead-acid batteries is
less than one year. The application of lithium batteries has greatly extended
the service life of batteries and reduced service investment. Lithium batteries
are also more suitable for high-current charging and discharging to meet the
power demand in special scenarios.
❸The high cycle and high current performance of lithium batteries also
provide the basis for towers to implement revenue-generating services such as
peak shaving and valley filling at base stations in the future, as well as other
value-added services.
Generally speaking, batteries mainly play a backup role in communication
base station energy storage, and they need to maintain uninterrupted DC power
supply of the base station in environments such as natural disasters, tight
power dispatching, and maintenance. Compared with lithium batteries, this poses
a greater challenge to BMS.
Due to the different types and sizes of domestic lithium batteries, retired
batteries also have different models. Under the premise that the level of
echelon lithium batteries is uneven, BMS needs different control strategies from
new lithium batteries to adapt to various types of retired batteries. It also
needs to solve the problem of how lithium batteries and BMS can work smoothly
with the base station power system. .
In addition, from a safety perspective, lithium batteries are
electrochemical products and are prone to thermal runaway under overvoltage
conditions and dendrites under undervoltage conditions, which will cause safety
hazards.
"In communication base station energy storage, you can think of BMS as the
'brain' of lithium batteries. How to create high-security supporting products
based on the cascade utilization of lithium batteries falls on BMS
manufacturers." Hu Longwen said, whether it is In terms of the versatility and
adaptability design of the BMS, as well as the fast connection with the
communication collector (FSU), Tianbangda conducted careful research and
development, testing, communication and negotiation in the early stage.
Based on recognition of its technical strength, China Tower also teamed up
with Tianbangda to draft standards for lithium battery BMS for echelons of
communication base stations. At present, Tianbangda's BMS series products have
covered 20 lithium battery PACK companies supporting China's iron towers, and
have developed a variety of integrated and discrete targeted solutions. After
nearly a year of large-scale shipments, Tianbangda's products are distributed in
almost all cities and counties across the country, and have won unanimous praise
from customers and towers for their stable and reliable high quality.
"2018 officially kicked off the tiered utilization of China's towers, and
it is expected that the demand will be greater in 2019." In response to this,
providing tower delivery services will be Tianbangda's core task in 2019. To
this end The company has launched comprehensive preparations in various aspects
such as production capacity planning, team building, after-sales service, and
supply chain configuration, and is expected to reach a higher stage in 2019.
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