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A battery management system and circuit for charging and discharging a battery pack

A battery management system, battery pack technology, applied in battery circuit devices, different battery charging, circuit devices, etc., can solve problems such as low charging and discharging efficiency, and achieve the effect of improving charging and discharging efficiency, and taking into account both safety and efficiency.

Pending Publication Date: 2019-01-18
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of low charging and discharging efficiency existing in the related art when the charging of the rechargeable battery is not overcurrent, an embodiment of the present invention provides a battery management system BMS and a circuit for charging and discharging a battery pack

Method used

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  • A battery management system and circuit for charging and discharging a battery pack
  • A battery management system and circuit for charging and discharging a battery pack
  • A battery management system and circuit for charging and discharging a battery pack

Examples

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example 1

[0059] Example 1. Battery management system BMS and charging and discharging circuit

[0060] image 3 It is a charging and discharging circuit for a battery pack according to an embodiment of the present invention Figure three .

[0061] like image 3 As shown, the current limiting module U3 is connected in parallel to both ends of the main circuit switch S1 to form a switch part, and the switch is controlled by the BMS processor. The switch part is connected in series with the battery pack U1 and the power supply Y1 to form a battery charging circuit; when the power supply Y1 is powered off, the switch part is connected in series with the battery pack and the load RL to form a battery discharge circuit. The battery management system (BMS) is used to detect and sample voltage, current, temperature, etc., and to control and manage the safe and reliable operation of lithium battery packs. It mainly includes but is not limited to the following parts (in the dashed box): BMS ...

example 2

[0075] Example 2. A method for charging and discharging a battery pack using the circuit in Example 1.

[0076] Step 1, BMS processor U2 calculates and judges whether there is a fault or protection alarm in the system before battery charging starts;

[0077] If not, first close the main discharge switch S2 and connect the main discharge circuit to ensure the ability to discharge at any time. Step 2, the BMS detects the power supply voltage Uy in real time through the voltage detection module D2, and the voltage detection module D1 detects the battery pack voltage Ub in real time;

[0078] Step 3, the BMS processor U2 controls the charging mode by calculating the pressure difference ΔV between Uy and Ub and the agreed threshold U0.

[0079] (1) If the pressure difference △V (△V=Uy-Ub) between Uy and Ub is greater than the agreed threshold U0, that is, △V>U0, there is a risk of charging overcurrent if the pressure difference is too large. At this time, the BMS processor U2 cont...

example 3

[0085] Example 3, the power supply Y1 and the load RL are used to describe the application scenario of the present invention. The battery pack is used as a backup power supply for supplying power to the load RL when the power supply Y1 is powered off. The BMS processor is controlled and managed by the battery management system BMS The core component of the main circuit switch is connected in parallel with the current limiting module, and the switch state is controlled by the BMS processor. The method provided by Example 3 may include the following steps:

[0086] Step 1, setting the pressure difference threshold U0 and the current protection threshold Imax parameter size in the BMS;

[0087] Step 2, after the BMS processor U2 is powered on and initialized, it detects the system protection mechanism and fault;

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Abstract

The embodiment of the invention discloses a battery management system and a circuit for charging and discharging a battery pack. The circuit may include at least one voltage detection module D, a battery management system BMS processor, a current limiting module U3, a current detection module I, and at least one switch S1. The current limiting module U3 is connected in parallel with the switch S1,and is connected in series with the current detecting module I after being connected in parallel; A voltage detection module D, configured to detect a voltage value of the power supply Y1 and the charging battery pack U1; A current detection module I, configured to detect the current value of the loop in which the current detection module I is located; BMS processor, D for control that voltage detection module, Current limiting module U3, The current detection module I and the switch S1 can solve the problem of low charging and discharging efficiency under the condition that the charging of the rechargeable battery does not exceed the current in the related art, realize the improvement of the charging and discharging efficiency of the rechargeable battery under the condition that the charging of the rechargeable battery does not exceed the current, and achieve the beneficial effect that both the safety and the efficiency of the rechargeable battery are taken into account.

Description

technical field [0001] The invention relates to the technical field of battery charging, in particular to a battery management system and a circuit for charging and discharging a battery pack. Background technique [0002] Lithium-ion batteries are prone to overcurrent during the charging process and cause safety problems. Ensuring charging safety has always been one of the important difficulties that the battery management system (BMS) needs to overcome. The current technical solution is to connect the current limiting module in series in the charging and discharging main circuit, and the current limiting works all the time during the charging and discharging process. Although this solution solves the over-current problem, the power consumption of the current-limiting module is large, the charging and discharging efficiency is very low, and it cannot be applied in fields that require high-current fast charging and fast discharging. Under the condition that the charging of ...

Claims

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Application Information

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IPC IPC(8): H02J7/00H02J9/06
CPCH02J7/0036H02J7/0047H02J9/061H02J7/00304H02J7/0071
Inventor 姜欢杨锐李杨张绍敏
Owner ZTE CORP
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