Adopt a brand new one? CTP？ Compared with the traditional battery pack on the market at present, CTP? The volume utilization rate of battery pack has improved? 15%-20%, with fewer parts? 40%, production efficiency has improved? 50%, after put into use, the manufacturing cost of power batteries will be greatly reduced, and the energy density will also rise to? 200Wh/kg？ Above.
CTP (cell? Where to? What is packaging?
As consumers, most people are reluctant to delve into such deep hard-core technology. How can I describe it in the most popular and understandable words? CTP- Simplify packaging and reduce costs. Take the transportation of eggs as an example, suppose that the previous transportation mode is every? 20? An egg in a gift box from? Answer? When will it be delivered? b？ Point, CTP? Technology simplification, every? 1000? Eggs are packed in a box or even a whole car has only one box, from? Answer? What's the point of transportation? b？ Point, thus saving packaging cost and transportation weight. Obviously, the safety of such packaging and the convenience of checking and transporting damaged eggs are greatly reduced. Is this true, too? CTP？ Advantages and disadvantages of. With this concept, what is it? CTP？ Technology.
The battery pack carried on the general electric vehicle is assembled into modules by batteries, and then the modules are installed in the battery pack, forming a three-level assembly mode of "battery-module-battery pack". And then what? CTP, right? Cells? Where to? PACK, the battery cells are directly integrated into a battery pack, thus eliminating the intermediate module link. Since the module is directly integrated into the battery pack, it is necessary to clarify the function of the module.
What is a module?
The so-called module is a module composed of some related components, which can also be understood as a concept of component collection and assembly. In the field of battery pack, several batteries, conductive strips, sampling units and some necessary structural support components are integrated to form a module, also known as a module. Dismantle the module and its related high-voltage cables, communication cables, cooling/preheating circulating pipes, BMS? Monitoring module, temperature sensor, current sensor and other equipment should be improved or rearranged accordingly. Contemporary Ampere Technology Co., Ltd? CTP？ The technical route is based on the high-nickel ternary lithium architecture, and its core is to reduce the number of modules. A number of large-capacity batteries directly form a standardized battery pack, and then they are flexibly stacked to form larger battery modules to meet the energy storage needs of different vehicles. At present? CTP？ There are two technical routes, one is to replace small modules with large modules, and the other is to adopt a completely module-free mode.
Models? 3? Is it made up of about four lengths? 2? M's big module composition, and before Tesla? Models? s？ What is the module of? 16? individual
Replace the previous small module with a large module. Remove the side plates of the previous small module and connect them with tie straps to make the module bigger. Actually, Tesla? Models? 3? Based on what? 2 1700? Integration of large modules has shown the effect of this trend, compared with before? Models? 3? It's just that the battery cost has decreased? 35%。
Large module scheme-Contemporary Ampere Technology Co., Ltd.? Collaborative test plan
Its main highlight is that the modules are closely connected through the sleeve, and there is a fixing device under the sleeve to connect with the whole vehicle, which simplifies the structure of the whole module and realizes light weight.
Patent of Contemporary Ampere Technology Co., Ltd.
As shown in figure 1 to figure 4, each battery module? 1 1? Both include frames? 1 1 1? And placed in a frame? 1 1 1? How many cells are there in the battery? 1 12, adjacent frames? 1 1 1? The sleeve is fixedly arranged between them. 12, sleeve? 12? Is there a passage through the fixture? 124, fasteners pass through the above channels? 124, assembled into a battery pack? 1, and then install the cross member? 13? Under the action, it is fixed on the whole vehicle.
Figure 1
Figure ii
Figure 3
Figure 4
As can be seen from the above analysis, CTP? This is not a very advanced technology. It is nothing more than using large batteries and large modules, mainly to optimize the internal connection of the battery pack and omit the parts of the intermediate process, thus simplifying the assembly process and flow. Contemporary Ampere Technology Co., Ltd? CTP？ The battery cell capacity has changed from the initial? 50Ah？ More than now? 200Ah, greatly reducing the specific gravity of the shell.
There are three main advantages: first, CTP? Because there is no standard module limit, the battery pack can be used in different models and has a wide range of applications; Second, reduce the internal structure, CTP? Battery pack can indirectly improve the volume utilization rate and energy density of the system; Third, its heat dissipation effect is higher than the current small module battery pack.
Contemporary Ampere Technology Co., Ltd? CTP？ Battery technology and? 8 1 1? The combination of high nickel batteries will get better cruising range and higher energy density. According to the information published by Contemporary Ampere Technology Co., Ltd., CTP? The battery pack will still be packaged in square shell, which is a better choice considering the stability of high nickel batteries at present.
Modular solution-BYD blade power?
BYD's "Blade" battery is based on its expertise in lithium ferrous phosphate technology, and its self-developed length is longer than? 0.6? Battery cells are also evolving to large capacity, but the shape of the cells is flatter and narrower (the long side can be customized, and the maximum stable length of the cells can be achieved? 2 100mm), arranged together in an array, inserted into the battery pack like a "blade", which is why everyone calls it a "blade battery".
Patents disclosed by BYD
We boldly guess that "blade battery" has considered the multi-specification adaptability requirements of its own products from the beginning. The smaller the narrow side of the "blade", the better, which means that the vertical height is easier to adapt to high chassis and low chassis models. In the future, multi-functional vehicles with ultra-thin chassis may be developed on this basis, so that users can get more use space and larger battery capacity. The energy density of the power battery assembly can be correspondingly improved, and better battery cooling/preheating settings can be obtained. Can the battery temperature difference be controlled at? 1℃。
This is the latest "blade battery" to be carried by BYD Korea, with an increase in volume compared with energy? 50%, cost reduction? 30%, cruising range reached? 605 kilometers. BYD? CTP？ The combination of battery technology and lithium iron phosphate battery core will bring better temperature resistance and stable cruising range, and the reduction of cost will also bring stronger competitiveness or better profit margin to vehicles.
Because BYD's early technical layout bet on lithium ferrous phosphate, this is also one of the important reasons why lithium ferrous phosphate is a "blade battery". Lithium iron phosphate battery does not need metal cobalt, and its cost is lower than that of ternary lithium battery. What is the price of lithium iron phosphate battery on the market at present? 0.65 yuan /wh, far lower than ternary battery? 0.85 yuan /wh. Of course, the reason for betting on lithium ferrous phosphate is not because it is cheaper, but because it has important advantages such as high safety and long cycle life. With the packaging advantage of blade battery, the weakness of low energy density of lithium ferrous phosphate is further reduced.
Advantages of lithium iron phosphate battery:
( 1)? High energy density: What is the nominal voltage? 3.2V, energy density is lead-acid battery? 4? About times, small size, light weight;
(2) Strong safety: the lithium ferrous phosphate cathode material has good electrochemical performance, stable charging and discharging platform and stable structure during charging and discharging;
(3) Good high temperature performance: external temperature? 55℃? When the battery is working normally;
(4) High power output: What is the standard discharge? 0.2C, is that ok? 3C？ Charging and discharging;
(5) Long cycle life: normal temperature? 1C？ Charge and discharge, monomer menstruation? 2000? Capacity is still greater than? 80%;
(6) Environmental protection: the whole production process is clean and nontoxic, and all raw materials are nontoxic.
CTP？ Is the packaging tolerance getting worse?
Because the module is removed or simplified, the battery core is directly fixed inside the power battery assembly, so it is necessary to strengthen the structure, and the passive safety setting in the collision process has been obtained. It is precisely because of the removal of the module that the self-weight of the power battery assembly will be reduced to varying degrees.
Private cars have been used for a long time, and generally adopt non-load-bearing bodies without girders. The battery structure also needs to be able to withstand long-term stress changes caused by repeated deformation of the body. As the core component and stressed component of the chassis, the battery module must consider the structural strength to adapt to the complex use scene of the automobile. The ability to resist lateral collision is the most obvious demand, and manufacturers usually use the structure and material of battery pack shell to improve this ability.
Simulation model diagram of battery pack subjected to torsional force
Through structural analysis, we can see that Contemporary Ampere Technology Co., Ltd.? CTP？ Considering the maximization of volume packaging efficiency, the reliability of connection between large modules is more easily affected by diagonal repeated shear stress, which is a great challenge to the connection between high-voltage wiring harness and cooling system. It is worth mentioning that the battery pack patent applied by Contemporary Ampere Technology Co., Ltd. cancels the battery box in the prior art, and directly installs the battery module in the whole vehicle through the sleeve or the mounting beam, which not only realizes the lightweight of the battery pack, but also improves the connection strength of the battery pack in the whole vehicle.
Installation position of BYD battery pack
However, BYD's "Blade" battery actually retains the overall configuration of module packaging and battery package packaging. At the same time, as can be seen from the patent drawing, it is possible to reserve deformation space for the battery pack packaging according to the needs of the vehicle model to avoid direct stress on the ultra-thin and large battery cells. From the perspective of structural durability, BYD blade battery packaging is easier to make reliable products.
However, such an insurance structure will also bring other problems. Judging from the battery power density of BYD Korea announced by the Ministry of Industry and Information Technology, only? 140Wh/kg, what is the concept of this data? Put it in? 20 19? 2008 is a medium or even lower level, come on? 2020? In 2008, it was only the entry level. If BYD can further optimize the process and increase the energy density of lithium iron phosphate battery to? 200Wh/kg？ Even higher, ternary lithium batteries may gain more market share only by further increasing energy density.
Stop? CTP？ Become a stumbling block to "big brother"
CTP？ Although the above figure has many advantages, canceling the module link will also bring many risks. CTP？ There is a higher requirement for the consistency of the battery, and the deformation and poor heat dissipation performance of the battery caused by charging and discharging expansion need to be considered at the whole battery level.
The most important thing is that once a single battery cell fails, it will involve replacing the whole battery pack, instead of just replacing a certain module before, and the maintenance cost will increase greatly. This is also one of the pain points of Tesla battery being criticized by everyone-the maintenance cost is too high. Buy this kind of battery car, mainly pay attention to the details of the relevant insurance, so as to avoid accidents "killing" the whole car.
CTP？ Is it another export of battery technology?
The increase of energy density is the most exciting news for electric vehicle enthusiasts. After all, the improvement of energy density can really solve the biggest pain point of electric vehicles. Imagine when all the electric cars on the market can be easily done. 700km？ Do you have an attitude towards electric cars and gasoline cars when cruising? 180 ? Big change? Because of this, everyone is right? CTP？ Everyone is very concerned. After reading this article, you will probably find that, in fact? CTP？ Behind the technology is essentially a game between battery manufacturers and car companies, and the advantages and disadvantages of this technology are very obvious. According to the information currently known, Beiqi New Energy? EU5？ Will it be adopted in the future? CTP？ Battery pack technology.
At present, it is not a strong profit point for battery manufacturers to make modules. Most car companies can make modules themselves, such as BMW Brilliance, Beijing Benz and General Motors. Instead? Packing? Is the feasible way out. And battery manufacturers should change to? CTP？ Plan and get a chance to do the whole thing? Pack, CTP? Therefore, it has also been packaged and promoted as the next outlet for power batteries.
Edit the summary? /
I wonder if you can understand this article? CTP？ Is it a routine? Like double clutch +TIS? Packaging promotion is a golden power combination with strong power and low fuel consumption, but it does not mean that its reliability is generally high in maintenance cost, which is not suitable for the disadvantages of traffic congestion in China. CTP？ Technology can obviously improve the energy density of the battery, but it does have unstable damage. As a consumer, you can choose to be the first person to eat crabs and get some unique experiences from them, or you can choose to wait and see.
This article comes from car home, the author of the car manufacturer, and does not represent car home's position.