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EP-4742358-A1 - BATTERY MANAGEMENT SYSTEM AND METHOD

EP4742358A1EP 4742358 A1EP4742358 A1EP 4742358A1EP-4742358-A1

Abstract

Disclosed in the present invention are a battery management system and method. In the system, a battery module M comprises a switch A, a switch B, a battery cell C, a switch driving control unit D and a battery monitoring unit E, wherein a detection end of E is connected to the battery cell C, so as to acquire charge-level information and upload same to a processor unit F by means of a communication management unit G; and a command sent by the processor unit F is received to control the switch driving control unit D, so as to implement state control for the switches A and B. By means of the battery management system and method provided in the present invention, the limitations on the performance and service life of a single battery cell can be broken, such that the performance and service life of the entire battery pack system are improved.

Inventors

  • YAO, SUYI
  • HE, JIE
  • WANG, LANGYUAN

Assignees

  • Common Mode (Gongmo) Semiconductor Co. Ltd

Dates

Publication Date
20260513
Application Date
20240703

Claims (10)

  1. A battery management system, comprising: a battery module M, which can be connected in series or parallel to form a battery pack of corresponding capacity and voltage; a communication management unit G, connected to each battery module M to acquire power information; a processor unit F, connected to the communication management unit G to acquire the power information of each battery module M and send a control command to the battery module M based on the power information; wherein the battery module M comprises a switch A, a switch B, a battery unit C, a switch drive control unit D, and a battery monitoring unit E; the battery unit C, as a single-stage battery unit, consists of one or more battery cells connected in parallel or parallel and series; the switch A is connected in series to the battery unit C to form a branch, and the switch A is used to control the on and off of the battery unit C; the switch B is connected in parallel to the series branch formed by the switch A and the battery unit C, and the switch B is used to control whether the battery unit C is bypassed; the switch drive control unit D is connected to the switches A and B and used to control the states of the switches A and B; and a detection terminal of the battery monitoring unit E is connected to the battery unit C directly or indirectly through the switch A, to acquire the power information, which is then uploaded to the processor unit F through the communication management unit G; and the battery monitoring unit E receives the command sent by the processor unit F, to control the switch drive control unit D, so as to control the states of the switches A and B.
  2. The battery management system according to claim 1, wherein the communication management unit G is connected to the battery monitoring unit E of the battery module M in a daisy chain or wireless communication manner.
  3. The battery management system according to claim 1, wherein the battery monitoring unit E is directly connected to the switch drive control unit D.
  4. The battery management system according to claim 1, wherein the battery monitoring unit E is connected to the switch drive control unit D through a daisy chain or wireless communication.
  5. The battery management system according to claim 1, wherein the battery monitoring unit E is integrated with the switch drive control unit D, and the integrated D+E is connected to the communication management unit G in a daisy chain or wireless communication manner.
  6. The battery management system according to claim 1, wherein the switch drive control unit D is integrated with the switches A and B, and the battery monitoring unit E is connected to the integrated A+B+D directly or through a daisy chain or wireless communication, and is also connected to the communication management unit G through a daisy chain or wireless communication.
  7. The battery management system according to claim 1, wherein the battery module M comprises a plurality of battery units C; each battery unit C is configured with the corresponding switch A, switch B, and switch drive control unit D; and the plurality of battery units C can be connected in series or parallel to form the battery module M of corresponding capacity and voltage.
  8. A battery management method, based on the battery management system according to any one of claims 1 to 7, wherein the method comprises a dynamic battery unit removal step: assuming a battery pack comprises m strings of battery modules connected in parallel, with n battery units C connected in series in each string of battery module, wherein 1 ≤ m; when the battery pack is working in a discharge state, if the voltage Vij of any battery unit C in the battery pack is less than a battery overdischarge protection voltage threshold VL, wherein i represents the number of a battery unit string, 1 ≤ i ≤ m, j represents the number of the battery unit C in the battery unit string, and 1 ≤ j ≤ n; then the battery unit with the lowest voltage in each string is found, and the processor unit F turns off the corresponding switch Aij and turns on the switch Bij through the switch drive control unit D corresponding to the battery unit C; and continuous monitoring and dynamic removal are performed; at this point, the capacity of the battery pack changes to (1-1/nt) of its original capacity, wherein t represents the number of dynamic removals.
  9. The battery management method according to claim 8, wherein the method further comprises a charge balance step: when the battery pack is working in a charge state, if the voltage Vij of any battery unit C in the battery pack is greater than a battery unit overdischarge overvoltage protection threshold VH, the battery unit with the highest voltage in each string is found, and the processor unit F turns off the corresponding switch Aij and turns on the switch Bij through the switch drive control unit D corresponding to the battery unit C; continuous monitoring is performed to achieve balance of the battery units within the battery pack; and after the charge is completed or the charge state is converted to the discharge state, the switch B is turned off and the switch A is turned on in each battery unit C processed in the charge balance step.
  10. The battery management method according to claim 8, wherein in the switch on/off process, the D provides current limiting protection for the switches A and B separately; and the method further comprises a static removal step: when any battery unit C is damaged, the battery unit is hard isolated, the switch A is turned off and the switch B is turned on through the switch drive control unit D corresponding to the battery unit C.

Description

TECHNICAL FIELD The present invention relates to the technical field of battery management system, and more specifically, to a battery management system and a battery management method . BACKGROUND BMS is the abbreviation for Battery Management System, and its core system architecture is shown in FIG. 1, including: C. a battery unit, composed of a single battery cell or a plurality of battery cells connected in parallel, usually with functions of short-circuit protection, overheating protection, leakage protection, etc.; E. for measuring voltage information of the battery unit and providing feedback to F, which then controls E to perform battery management and other operations, where a plurality of Es are often integrated in one chip, known as an analog front end (AFE) of the battery management system; and F. a controller for acquiring basic battery information from E and performing further algorithms to control the operation of the entire battery management system. The conventional system architecture requires long lifespan of battery units and high consistency between battery units. The failure of a battery unit or inconsistent performance between battery units may readily lead to a significant decline in overall system performance or system failure. The maximum lifespan of the system is close to the lifespan of battery units, and is limited by the lifespan of a single battery unit and the consistency between the battery units. The lifespan of the system is estimated as follows: assuming the system has N battery units, the failure probability of the battery units is P1, and the consistency failure probability between the battery units is P2, the failure probability of the system is close to N×P1+P2. Currently, a battery of an energy storage or power battery system is usually composed of a plurality of battery units. The performance and lifespan of the conventional architecture are often limited by the performance and lifespan of the battery units. Therefore, overcoming the limitations on the performance and lifespan of battery units to improve the performance and lifespan of an entire battery pack system presents a critical challenge. SUMMARY The objective of the present invention is to propose a battery management system and method that can break through the limitations on the performance and lifespan of a single-stage battery unit to improve the performance and lifespan of an entire battery pack system. In order to achieve the above objective, the present invention provides a battery management system, including: a battery module M, which can be connected in series or parallel to form a battery pack of corresponding capacity and voltage; a communication management unit G, connected to each battery module M to acquire power information; a processor unit F, connected to the communication management unit G to acquire the power information of each battery module M and send a control command to the battery module M based on the power information; the battery module M includes a switch A, a switch B, a battery unit C, a switch drive control unit D, and a battery monitoring unit E;the battery unit C, as a single-stage battery unit, consists of one or more battery cells connected in parallel or parallel and series;the switch A is connected in series to the battery unit C to form a branch, and the switch A is used to control the on and off of the battery unit C;the switch B is connected in parallel to the series branch formed by the switch A and the battery unit C, and the switch B is used to control whether the battery unit C is bypassed;the switch drive control unit D is connected to the switches A and B and used to control the states of the switches A and B; anda detection terminal of the battery monitoring unit E is connected to the battery unit C directly or indirectly through the switch A, to acquire the power information, which is then uploaded to the processor unit F through the communication management unit G; and the battery monitoring unit E receives the command sent by the processor unit F, to control the switch drive control unit D, so as to control the states of the switches A and B. Further, the communication management unit G is connected to the battery monitoring unit E of the battery module M in a daisy chain or wireless communication manner. Further, the battery monitoring unit E is directly connected to the switch drive control unit D. Further, the battery monitoring unit E is connected to the switch drive control unit D through a daisy chain or wireless communication. Further, the battery monitoring unit E is integrated with the switch drive control unit D, and the integrated D+E is connected to the communication management unit G in a daisy chain or wireless communication manner. Further, the switch drive control unit D is integrated with the switches A and B, and the battery monitoring unit E is connected to the integrated A+B+D directly or through a daisy chain or wireless communication,