button battery cr1620

　　The composition and working principle of the button battery cr1620 management system

　　button battery cr1620 management system (button battery cr1620MANAGEMENTSYSTEM), electric vehicle button battery cr1620 management system (BMS) is an important link between vehicle power batteries and electric vehicles. Its main functions include: real-time monitoring of button battery cr1620 physical parameters; button battery cr1620 status estimation; online diagnosis and early warning; charging and discharging and precharge control; equalization management and thermal management, etc.

　　Secondary batteries have the following shortcomings, such as low storage energy, short life, problems in series and parallel use, safety of use, and difficulty in estimating button battery cr1620 power, etc. The performance of batteries is very complex, and the characteristics of different types of batteries vary greatly. The button battery cr1620 management system (BMS) is mainly to improve button battery cr1620 utilization, prevent button battery cr1620 overcharge and overdischarge, extend button battery cr1620 life, and monitor button battery cr1620 status. As the button battery cr1620 management system develops, other functions will be added.

　　The composition and principle of the button battery cr1620 management system:

　　The button battery cr1620 management system (BMS), also known as button battery cr1620 Management System, determines the status of the entire button battery cr1620 system by detecting the status of each single button battery cr1620 in the power button battery cr1620 pack, and makes corresponding control adjustments and strategy implementation for the power button battery cr1620 system based on their status to achieve The charge and discharge management of the power button battery cr1620 system and each cell ensures the safe and stable operation of the power button battery cr1620 system.

　　The topology structure of a typical button battery cr1620 management system is mainly divided into two major blocks: the master control module and the slave control module. Specifically, it consists of a central processing unit (main control module), data acquisition module, data detection module, display unit module, control components (fuse device, relay), etc. Generally, data information communication between modules is achieved by using internal CAN bus technology.

　　Based on the functions of each module, BMS can detect the voltage, current, temperature and other parameters of the power button battery cr1620 in real time, implement thermal management, balance management, high voltage and insulation detection of the power button battery cr1620, and calculate the remaining capacity, charge and discharge power of the power button battery cr1620, and SOC&SOH status.

　　How to configure a button battery cr1620 management system

　　Designing a monitor circuit for a new and button battery cr1620-based power system, what strategies would you adopt to optimize the cost and manufacturability of this design? Initial considerations will be to determine the preferred structure of the system and the location of the batteries and associated electronic components. After the basic structure is clear, the next issue that must be considered is the trade-off and coordination of the circuit topology, for example, how to optimize the communication and interconnection of the final product.

　　The external dimensions of the button battery cr1620 will have a significant impact on the power system structure. Want to use a large number of small cells to fit into a complex-shaped button battery cr1620 module (or button battery cr1620 pack)? Or do you have to use a very large button battery cr1620, which would limit the number of batteries due to weight or cause other size constraints? This is perhaps the most variable part of the design, as new button battery cr1620 designs continue to come to market and efforts continue to make button battery cr1620 modules or packs more consistent with the overall product concept when integrated into a product. For example, in the case of a car design, batteries may end up dispersed in certain spaces on the vehicle that would be inefficiently utilized without the batteries.

　　Another consideration is the interconnection of test signals and/or telemetry signals between the button battery cr1620 (or modular button battery cr1620 pack), the button battery cr1620 management system (or its subsystem), and the end application interface. In most cases, a housing can be made to integrate some data acquisition circuitry in the button battery cr1620 module or button battery cr1620 pack, so that if replacement is needed, important information such as production ID, calibration, usage specifications, etc. can be brought with the replaceable components. Walk. This type of information may be useful for button battery cr1620 management systems (BMS) or service equipment and minimizes the number of high-voltage rated wires required in the wiring harness.

　　(a) Centralized architecture (b) Distributed architecture

　　Next, for a given mechanical concept design, the monitoring hardware topology is determined by the precisely defined number of cells that need to be supported. In automotive applications, there are typically more than 100 button battery cr1620 measurement points in total, and the modularity of the system will determine how many cells a given circuit system measures. The most common situation is to divide all batteries into at least two sub-groups with safe disconnection of service plugs.

　　By keeping the voltage below 200V during a fault condition, this approach minimizes the risk of electric shock that service personnel may encounter. The larger button battery cr1620 pack size means two separate data acquisition systems, each supporting perhaps 50 button battery cr1620 taps. In some cases, all electronic components are on an affordable printed circuit board, but this requires a large number of interconnects, as shown in Figure 1(a). Alternatively, electronic components could be dispersed and more tightly integrated into the button battery cr1620 module, but this would require a telemetry linking approach. In order to achieve reliable data integrity, the remote measurement function circuitry built into the automotive wiring harness must use a rugged protocol, such as the widely used CAN bus.

　　Although the real CAN bus interface involves several network layers, the pHY layer can be easily used to form a BMSLAN structure for efficient communication within the module. This type of distributed structure is shown in Figure 1(b). This topology allows the computing workload to be distributed among several small processors, thereby reducing the required data transfer rate and mitigating EMI issues that can arise from LAN approaches. The final BMS application interface is likely to be a CAN bus connection to a main system management processor, and will need to define (or specify at the outset) specific message transactions.

　　Other factors may also affect the physical structure and monitoring circuitry. In the case of Li-ion batteries, cell capacity balancing is required, resulting in additional thermal management issues (heat removal), and if active balancing is required, power conversion circuitry is required. Temperature probes are often distributed throughout the module to provide a way to correlate voltage readings with state of charge, requiring some supporting circuitry and connection schemes. An often overlooked design consideration is that button battery cr1620 leakage should be minimal when the product is idle or stored on shelves prior to installation. In some cases, additional control wiring is necessary.

　　In the structures implemented above, there is a common measurement functional building block that includes a multi-channel ADC, safety isolation barriers, and some degree of local processing. The circuit in Figure 2 shows a scalable design platform that implements data acquisition functions. In this diagram, the core component that enables the functionality is Linear Technology's LTC6803 button battery cr1620 pack monitor IC, along with an SpI data isolator and some optional special-purpose circuitry shown. This circuit includes the input filter and passive balancing functions, forming a complete 12-cell data acquisition solution. If desired, this type of circuitry can be simply replicated to support more button battery cr1620 measurement schemes while sharing the local SpI port of the main microcontroller, which in turn provides the external CAN bus or other LAN type data link. need.

　　A major improvement over previous generation monitoring devices, the LTC6803 supports power shutdown and/or power from a button battery cr1620 pack alone. When power is removed from the V+ pin, the button battery cr1620 loading drops to zero (only nA level semiconductor leakage). Operating power can be provided by the connected button battery cr1620 pack voltage, or from a separate source to V+, as long as the voltage is always at least as high as the button battery cr1620 pack. For simplicity, the LTC6803 can also draw power directly from the button battery cr1620 pack, in which case the lowest power state (i.e. standby) will draw only 12uA. The LTM2883 data isolator is powered from the main processor through an internally isolated DC-DC converter, so the device will automatically power down along with the main processor. A very useful feature of the LTM2883 is that it can also deliver a lot of host-derived power to isolated electronic components (i.e. the button battery cr1620 side). A small boost power supply function component (LT3495-1 in Figure 2) is driven in this way to independently power the LTC6803 so that the button battery cr1620 provides only the ADC measurement input current (i.e., average < 200nA at active conversion). This circuit has the absolute lowest parasitic button battery cr1620 leakage while eliminating any button battery cr1620 operating current mismatch that could otherwise progressively cause a button battery cr1620 capacity imbalance.

　　A convenient feature of the LTC6803 is that it has two free ADC inputs with accuracy similar to the button battery cr1620 inputs. This convenient feature allows auxiliary measurements, including temperature, calibration signal or load current measurements, to be made with little additional circuitry. A particularly useful measurement is to use a gated resistor divider to measure the voltage across the button battery cr1620 pack, as shown in Figure 2 (using a 12:1 ratio, connected to the VTEMp1 input). When the circuit is powered down, the associated FET is disconnected so that the current measurement does not unnecessarily tax the button battery cr1620. Since the filtering of this port can be customized independently of the button battery cr1620 input, true Nyquist sampling rates up to 200sps are possible for accurate charge current calculations. Individual cell measurements can be used to periodically provide software calibration of the voltage divider across the entire button battery cr1620 pack, eliminating the need for expensive resistors. Another very useful use of the auxiliary input is to measure a very accurate calibrated power supply (such as Linear Technology's LT6655-3.3, a 0.025% accurate reference), in which case allowing the software to depend on the channel. Inherent match to channel, corrects for all other channels. Note that thermistor temperature probes do not have to be referenced to the button battery cr1620 potential, nor do these probes typically require 12-bit resolution. This type of probe is often suitable for interfacing directly with a microcontroller, leaving the auxiliary input of the high-performance LTC6803 free for more demanding functions.

　　In summary, there are many factors to consider in button battery cr1620 management system circuits, especially those that determine packaging limitations. When packaging design ideas come together, it is also important to consider the structure of the electronic circuitry and information flow (e.g., connectorization and wire count) that may also have mechanical effects. Once these factors are weighed and the package design is mature, simply plug in an LTC6803 platform and you're ready for a well-established, scalable and cost-effective data acquisition solution.

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