CN117124930A - Battery equalization method and system and vehicle - Google Patents

Battery equalization method and system and vehicle Download PDF

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Publication number
CN117124930A
CN117124930A CN202210549592.7A CN202210549592A CN117124930A CN 117124930 A CN117124930 A CN 117124930A CN 202210549592 A CN202210549592 A CN 202210549592A CN 117124930 A CN117124930 A CN 117124930A
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China
Prior art keywords
battery
battery cell
switch
cell unit
state
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CN202210549592.7A
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Chinese (zh)
Inventor
程敏
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Hella Shanghai Electronics Co Ltd
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Hella Shanghai Electronics Co Ltd
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Priority to CN202210549592.7A priority Critical patent/CN117124930A/en
Publication of CN117124930A publication Critical patent/CN117124930A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
    • B60L58/22—Balancing the charge of battery modules
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention provides a battery equalization method and system and a vehicle, wherein the battery equalization method comprises the following steps: the battery comprises two or more battery core units connected in series, wherein each battery core unit comprises a battery core, a first switch and a second switch, the first switch is connected in series with the battery core, and the second switch is connected in parallel with the battery core; detecting whether the battery cell unit is in an equilibrium state or not, and forming a control instruction when the battery cell unit is in the equilibrium state; and controlling the opening or closing of the first switch and the second switch according to the control instruction. After the technical scheme is adopted, the battery can realize balanced work under most conditions; after power is off, the DCDC is utilized to balance the mutual charge and discharge of the battery cell and the charge and discharge unit, and electric energy is effectively utilized.

Description

Battery equalization method and system and vehicle
Technical Field
The invention relates to the field of electric automobiles, in particular to a battery equalization system and a battery equalization method.
Background
The conventional electric automobile battery generally adopts a passive equalization mode. In order to keep consistency of each battery cell of the power battery of the electric automobile, the service life of a battery pack is protected, and the battery cells with high battery pack voltage are required to be balanced. The existing manufacturer generally uses a load consumption type passive balancing scheme, a resistor is connected in parallel to each battery, meanwhile, a switch is connected in series for control, and when balancing, the switch is closed, and electric quantity is released in a heat form.
The equalization mode causes energy waste, and the existing passive equalization can only perform equalization in a power-down or charging state, and the equalization function is not started during discharging.
Disclosure of Invention
In order to save electric power resources and enable the battery cells to actively reach an equilibrium state so as to achieve the technical effects of balancing the battery cells at any time and any place and keeping the consistency of the battery cells, the invention provides a battery balancing method, which specifically comprises the following steps:
detecting whether two or more series-connected battery core units are in an equilibrium state or not respectively, wherein each battery core unit comprises a battery core, a first switch and a second switch, the first switch is connected with the battery core in series, and the second switch is connected with the battery core in parallel;
forming a control instruction when the battery cell unit is in an equilibrium state;
and controlling the opening or closing of the first switch and the second switch according to the control instruction.
Preferably, detecting a state of the battery, wherein the state of the battery comprises a charging state, a discharging state or a power-down state; and controlling the opening or closing of the first switch and the second switch according to the state of the battery and the control instruction.
Preferably, when the battery cell unit is in an equilibrium state, judging whether the voltage of the battery cell unit is greater than a third threshold value or less than a fourth threshold value;
the battery cell unit in an equilibrium state and with the voltage larger than a third threshold value is a first battery cell unit, and the battery cell unit in an equilibrium state and with the voltage smaller than a fourth threshold value is a second battery cell unit;
when the battery is in a charging state, a first switch of the first battery cell unit is opened, and a second switch is closed;
when the battery is in a discharging state, the first switch of the second battery cell unit is opened, and the second switch is closed.
Preferably, the third switch of the battery cell unit is connected with a voltage transformation charging and discharging module, the voltage transformation charging and discharging module comprises a DCDC unit and a charging and discharging unit, and when the battery is in a power-down state, the third switch is closed; if the voltage of the battery cell unit is higher than a fifth threshold value, the battery cell unit charges the charging and discharging unit through DCDC; and if the voltage of the battery cell unit is lower than a sixth threshold value, the charging and discharging unit charges the battery cell unit through DCDC.
Preferably, the charge state and the voltage of the battery cell are detected respectively; when the charge state of the battery cell unit does not exceed a first threshold value and the difference value between the voltage and the minimum voltage is larger than a second threshold value, the battery cell unit is in an equilibrium state, so that a control instruction is formed, and the minimum voltage is the minimum value of the voltages of all the battery cell units.
In another aspect of the present invention, a battery equalization system is provided, wherein the battery cell module, the detection module and the control module comprise two or more battery cells connected in series; the battery cell unit comprises a battery cell, a first switch and a second switch, wherein the first switch is connected with the battery cell in series, and the second switch is connected with the battery cell in parallel; the detection module is used for respectively detecting whether the battery cell units are in an equilibrium state or not to form a control instruction; the control module is used for controlling the opening or closing of the first switch and the second switch according to the control instruction.
Preferably, the detection module is configured to detect a state of the battery, including a charging state, a discharging state, or a power-down state; the control module is used for controlling the opening or closing of the first switch and the second switch according to the state of the battery and the control instruction.
Preferably, the control module is configured to determine whether the voltage of the battery cell is greater than a third threshold or less than a fourth threshold; the battery cell unit in an equilibrium state and with the voltage larger than a third threshold value is a first battery cell unit, and the battery cell unit in an equilibrium state and with the voltage smaller than a fourth threshold value is a second battery cell unit;
when the battery is in a charging state, the control module is used for controlling the first switch of the first battery cell unit to be opened and the second switch to be closed;
when the battery is in a discharging state, the control module is used for controlling the first switch of the second battery cell unit to be opened and the second switch to be closed.
Preferably, the device comprises a voltage transformation charging and discharging module, wherein the voltage transformation charging and discharging module comprises a DCDC unit and a charging and discharging unit, the battery cell unit is connected with the voltage transformation charging and discharging module through a third switch, and when the battery is in a power-down state, the control module is used for controlling the third switch to be closed; if the voltage of the battery cell unit is higher than a fifth threshold value, the control module is used for controlling the battery cell unit to charge the charging and discharging unit through DCDC; and if the voltage of the battery cell unit is lower than a sixth threshold value, the control module is used for controlling the charging and discharging unit to charge the battery cell unit through DCDC.
Preferably, the detection unit is used for detecting the charge state and voltage of the battery cell unit; and when the charge state of the battery cell unit does not exceed a first threshold value and the difference value between the voltage and the minimum voltage is larger than a second threshold value, the battery cell unit is in an equilibrium state, and the detection module is used for forming a control instruction.
The invention also provides a vehicle comprising a battery equalization system as described in any one of the above.
After the technical scheme is adopted, compared with the prior art, the method has the following beneficial effects:
1. during discharging, a switch can be utilized to skip the low-voltage battery cell, so that the high-voltage battery cell works, and when the voltage of the high-voltage battery cell drops to the battery cell, the high-voltage battery cell works together, thereby ensuring the consistency of the battery cell; during charging, a switch can be utilized to skip the high-voltage core, the low-voltage core is charged firstly, and the high-voltage core is charged together when the voltage of the low-voltage core rises to the high-voltage core; when the power battery pack is powered down, the DCDC is utilized to balance the mutual charge and discharge modes of the battery core and the small battery of the power battery pack, so that the voltage of the battery core can be kept consistent, the small battery can be charged, and the battery can realize balanced work under most conditions.
2. After power is off, the DCDC is utilized to balance the mutual charge and discharge of the battery cell and the charge and discharge unit, and electric energy is effectively utilized.
Drawings
FIG. 1 is a schematic diagram of a battery equalization method according to an embodiment of the invention;
FIG. 2 is a schematic diagram of another method for balancing a battery according to an embodiment of the invention;
FIG. 3 is a schematic diagram of a battery equalization system according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a battery equalization system in an unbalanced state according to another embodiment of the present invention;
fig. 5 is a schematic diagram of a battery equalization system in a charge-discharge equalization state according to another embodiment of the present invention;
fig. 6 is a schematic diagram of a battery equalization system in a powered-down state according to another embodiment of the present invention.
Reference numerals:
replyA-first switch, replyB-second switch, replyC-third switch.
Detailed Description
Advantages of the invention are further illustrated in the following description, taken in conjunction with the accompanying drawings and detailed description.
The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.
It should be understood that although the terms first, second, third, etc. may be used in this disclosure to describe various information, these information should not be limited to these terms. These terms are only used to distinguish one type of information from another.
In the following description, suffixes such as "module", "component", or "unit" for representing elements are used only for facilitating the description of the present invention, and are not of specific significance per se.
In one embodiment consistent with the present invention, as shown in fig. 1, a battery equalization method is provided. The battery comprises two or more battery core units connected in series, wherein each battery core unit comprises a battery core, a first switch and a second switch, the first switch is connected in series with the battery core, and the second switch is connected in parallel with the battery core; respectively detecting whether the battery cell units are in an equilibrium state or not, and forming a control instruction when the battery cell units are in the equilibrium state; and controlling the opening or closing of the first switch and the second switch according to the control instruction.
In this embodiment, the working states of the corresponding battery cells can be controlled by setting the first switch and the second switch, and when the first switch is closed and the second switch is opened, the battery cell unit discharges or charges. The control unit correspondingly controls the working states of the battery cell units by detecting whether the battery cell units are in an equilibrium state or not, so that the energy waste of the battery cell units can be reduced, and the working states of the battery cell units accord with the current practical conditions.
More preferably, in another specific embodiment, the state of the battery is first detected, i.e. whether the battery is in a charged state, a discharged state or a powered down state. The control module controls the first switch and the second switch of the battery cell unit according to different states of the battery and the control instruction.
Regarding the equalization state, there are various criteria in the art, for example, in this embodiment, the cell charge state SOC (State of Charge) or the cell voltage is used as a target parameter for equalization control, and in other embodiments, the battery temperature may be used as an auxiliary criterion, and equalization may be prohibited if the temperature exceeds a set threshold. It should be understood that, in the present invention, the charge state and the telecommunication voltage are selected as the equalization logic, so that the voltage is selected as the judgment standard when the subsequent judgment is performed on whether the charge/discharge operation is needed. In other embodiments, if other parameters such as current are used as the parameters for determining the equilibrium state, the thresholds described below may be adjusted accordingly to current data. This is a common technical means in the art, and the present invention is not described herein.
In this embodiment, the charge state and voltage of the battery cell are detected; when the charge state of the battery cell unit does not exceed a first threshold value and the difference value between the voltage and the minimum voltage is larger than a second threshold value, the battery cell unit is in an equilibrium state, so that a control instruction is formed, and the minimum voltage is the minimum value of the voltages of all the battery cell units; the control module controls the opening or closing of the first switch and the second switch according to the state of the battery and the control instruction.
The first threshold value and the second threshold value are different according to the type of the battery or the working state of the battery. For example, when the battery is LFP (LiFePO 4), the first threshold of the state of charge of the cell may be 90%.
Specifically, in this embodiment, when the battery cell unit is in an equilibrium state, it is determined whether the voltage of the battery cell unit is greater than a third threshold or less than a fourth threshold; the battery cell unit in an equilibrium state and with the voltage larger than a third threshold value is a first battery cell unit, and the battery cell unit in an equilibrium state and with the voltage lower than a fourth threshold value is a second battery cell unit;
when the battery is in a charging state, the control module opens a first switch of the first battery cell unit and closes the second switch;
when the battery is in a discharging state, the control module opens the first switch of the second battery cell unit and closes the second switch.
Namely, the battery cell unit in the balanced state is further divided into a first battery cell unit to be charged and balanced and a second battery cell unit to be discharged and balanced, and when the battery is in a charging or discharging state, the two battery cell units are respectively controlled. If the battery is in a charging state, the high-voltage battery core with the voltage larger than a third threshold value is required to be temporarily stopped from being charged until the battery exits from the balanced state, the second switch is opened, the first switch is closed, and the battery is continuously charged. If the battery is in a discharging state, the low-voltage battery core with the voltage lower than the fourth threshold value is required to be temporarily stopped from discharging until the battery exits from an equilibrium state, the second switch is opened, the first switch is closed, and the battery is continuously discharged.
Therefore, whether the battery cells are in an equilibrium state or not is judged, the working states of the corresponding battery cells are controlled by combining the working states of the batteries, the whole battery can be balanced autonomously, and the voltages of the battery cells are kept consistent.
Further, as shown in fig. 2, in another preferred embodiment, the third switch of the battery cell unit is connected to a voltage transformation charging and discharging module, where the voltage transformation charging and discharging module includes a DCDC unit and a charging and discharging unit, and when the battery is in a power-down state, the control module controls the third switch to be turned on; if the voltage of the battery cell unit is higher than a fifth threshold value, controlling the battery cell unit to charge the charging and discharging unit through DCDC; and if the voltage of the battery cell unit is lower than a sixth threshold value, controlling the charging and discharging unit to charge the battery cell unit through DCDC.
In this embodiment, each cell unit is connected to the charge/discharge unit through the third switch, and the charge/discharge unit in this embodiment is a small battery, and the small battery and the cell unit are mutually charged/discharged through voltage transformation of the DCDC unit. Specifically, before the battery is powered down, the control unit closes the first switches of all the battery core units, opens the second switches and opens the third switches to enable the battery core units to enter an unbalanced state, after the battery is in a powered down state, the control module closes the third switches, further judges whether the battery core units are in a state to be balanced according to the voltage, and if the voltage of the battery core units is higher than a fourth threshold, controls the battery core units to charge small batteries; and if the voltage of the battery cell unit is lower than a fourth threshold value, controlling the small battery to charge the battery cell unit through DCDC.
In this embodiment, if the battery cells are in the unbalanced state, the control unit closes all the first switches, opens all the second switches, and opens all the third switches, so that all the battery cells can be charged and discharged simultaneously.
Compared with the prior art, the invention uses the resistor to consume electric quantity, and the electric core and the small battery are balanced in a way of mutually charging and discharging through the DCDC, so that the voltage of the electric core can be kept consistent, the small battery can be charged, and the electric quantity is reasonably utilized.
In another embodiment of the present invention, there is provided a battery equalization system, as shown in fig. 3, including: the battery cell module comprises two or more battery cell units connected in series; the battery cell unit comprises a battery cell, a first switch and a second switch, wherein the first switch is connected with the battery cell in series, and the second switch is connected with the battery cell in parallel; the detection module is used for detecting whether the battery cell unit is in an equilibrium state or not, and forming a control instruction; the control module is used for controlling the opening or closing of the first switch and the second switch according to the control instruction.
The detection module is used for detecting the state of the battery, including a charging state, a discharging state or a power-down state; the control module is used for controlling the opening or closing of the first switch and the second switch according to the state of the battery and the control instruction.
In this embodiment, the control module is a battery management controller (BMS), which is a vehicle component commonly used in the art, and the detection module may be integrated in the battery management controller, so that the battery management controller may detect the working state of the battery, determine that the battery is in a charging state, a discharging state or a discharging state, and correspondingly control the first switch and the second switch of the battery core unit according to the working state of the battery.
Further, as described above, the equilibrium state is an operation state in which each cell unit is kept consistent, and in a practical situation, it is necessary to keep the consistency of each cell of the battery, thereby protecting the service life of the battery. The equilibrium state of the battery varies depending on the kind of the battery. The specific judgment standard is set according to the actual situation, and the invention is not particularly limited herein.
In addition, the control module is used for judging whether the voltage of the battery cell unit is greater than a third threshold value or smaller than a fourth threshold value; the battery cell unit in an equilibrium state and with the voltage larger than a third threshold value is a first battery cell unit, and the battery cell unit in an equilibrium state and with the voltage lower than a fourth threshold value is a second battery cell unit; when the battery is in a charging state, the control module is used for controlling the first switch of the first battery cell unit to be opened and the second switch to be closed; when the battery is in a discharging state, the control module is used for controlling the first switch of the second battery cell unit to be opened and the second switch to be closed. The technical features are similar to those of the battery equalization method, and the invention is not repeated here.
In another embodiment, the battery equalization system further includes a voltage transformation charging and discharging module, the voltage transformation charging and discharging module includes a DCDC unit and a charging and discharging unit, the battery cell unit is connected with the voltage transformation charging and discharging module through a third switch, and when the battery is in a power-down state, the control module is used for controlling the third switch to be closed; if the voltage of the battery cell unit is higher than a fifth threshold value, the control module is used for controlling the battery cell unit to charge the charging and discharging unit through DCDC; and if the voltage of the battery cell unit is lower than a sixth threshold value, the control module is used for controlling the charging and discharging unit to charge the battery cell unit through DCDC. It should be appreciated that the fourth threshold is not a fixed voltage value, which is a fluctuating value,
fig. 4 is a schematic diagram of a battery equalization system when the battery is in an unbalanced state in this embodiment, and at this time, all the first switches delaya are controlled to be closed, and the second switches delayb and the third switches delayc are controlled to be opened, so that all the battery cells are discharged together; fig. 5 is a schematic diagram of a battery equalization system when a battery is in a charge-discharge state, wherein if the battery equalization system is in a charge state, a first switch relay a of a to-be-discharged battery cell unit is opened, a second switch relay b of the to-be-discharged battery cell unit is closed, and if the battery equalization system is in a discharge state, the first switch relay a of the to-be-discharged battery cell unit is opened, and the second switch relay b is closed; fig. 6 is a schematic diagram of a battery equalization system before the battery is powered down, the control module closes the first switch relay a, opens the second switch relay b, opens the third switch relay c to enable the battery pack to enter an unbalanced state, and after the battery is in a powered down state, the control module closes the third switch relay c correspondingly connected with each battery cell unit to control the battery cell units to be simultaneously connected with the DCDC to perform discharge equalization on the small battery or charge equalization on the corresponding battery cell units by the small battery.
According to the embodiment, through the operation of each electric core of the battery and the charge and discharge between the battery and the small battery, the battery can be balanced at any time and any place, the consistency of the electric cores is kept, and the energy consumed by the power battery is reasonably utilized.
In addition, in another embodiment of the present invention, a vehicle is provided that includes any of the battery equalization systems described above. The vehicle can be a new energy electric vehicle, so that the service life of a vehicle battery can be prolonged, and a guarantee is provided for long-term use of the vehicle.
It should be noted that the embodiments of the present invention are preferred and not limited in any way, and any person skilled in the art may make use of the above-disclosed technical content to change or modify the same into equivalent effective embodiments without departing from the technical scope of the present invention, and any modification or equivalent change and modification of the above-described embodiments according to the technical substance of the present invention still falls within the scope of the technical scope of the present invention.

Claims (11)

1. A battery equalization method is characterized in that,
detecting whether two or more series-connected battery core units are in an equilibrium state or not respectively, wherein each battery core unit comprises a battery core, a first switch and a second switch, the first switch is connected with the battery core in series, and the second switch is connected with the battery core in parallel;
forming a control instruction when the battery cell unit is in an equilibrium state;
and controlling the opening or closing of the first switch and the second switch according to the control instruction.
2. The battery equalization method of claim 1, wherein,
detecting a state of the battery, wherein the state of the battery comprises a charging state, a discharging state or a power-down state; and controlling the opening or closing of the first switch and the second switch according to the state of the battery and the control instruction.
3. The battery equalization method of claim 2, wherein,
when the battery cell unit is in an equilibrium state, judging whether the voltage of the battery cell unit is larger than a third threshold value or smaller than a fourth threshold value;
the battery cell unit in an equilibrium state and with the voltage larger than a third threshold value is a first battery cell unit, and the battery cell unit in an equilibrium state and with the voltage smaller than a fourth threshold value is a second battery cell unit;
when the battery is in a charging state, a first switch of the first battery cell unit is opened, and a second switch is closed;
when the battery is in a discharging state, the first switch of the second battery cell unit is opened, and the second switch is closed.
4. The battery equalization method of claim 3, wherein,
the third switch of the battery cell unit is connected with a transformation charging and discharging module, the transformation charging and discharging module comprises a DCDC unit and a charging and discharging unit, and when the battery is in a power-down state, the third switch is closed;
if the voltage of the battery cell unit is higher than a fifth threshold value, the battery cell unit charges the charging and discharging unit through DCDC;
and if the voltage of the battery cell unit is lower than a sixth threshold value, the charging and discharging unit charges the battery cell unit through DCDC.
5. The battery equalization method of claim 1-4, wherein,
detecting the charge state and voltage of the battery cell;
when the charge state of the battery cell unit does not exceed a first threshold value and the difference value between the voltage and the minimum voltage is larger than a second threshold value, the battery cell unit is in an equilibrium state, so that a control instruction is formed, and the minimum voltage is the minimum value of the voltages of all the battery cell units.
6. A battery equalization system, comprising: the battery cell module, the detection module and the control module,
the battery cell module comprises two or more battery cell units connected in series;
the battery cell unit comprises a battery cell, a first switch and a second switch, wherein the first switch is connected with the battery cell in series, and the second switch is connected with the battery cell in parallel;
the detection module is used for respectively detecting whether the battery cell units are in an equilibrium state or not to form a control instruction;
the control module is used for controlling the opening or closing of the first switch and the second switch according to the control instruction.
7. The battery equalization system of claim 6, wherein,
the detection module is used for detecting the state of the battery, including a charging state, a discharging state or a power-down state;
the control module is used for controlling the opening or closing of the first switch and the second switch according to the state of the battery and the control instruction.
8. The battery equalization system of claim 7, wherein,
the control module is used for judging whether the voltage of the battery cell unit is larger than a third threshold value or smaller than a fourth threshold value;
the battery cell unit in an equilibrium state and with the voltage larger than a third threshold value is a first battery cell unit, and the battery cell unit in an equilibrium state and with the voltage smaller than a fourth threshold value is a second battery cell unit;
when the battery is in a charging state, the control module is used for controlling the first switch of the first battery cell unit to be opened and the second switch to be closed;
when the battery is in a discharging state, the control module is used for controlling the first switch of the second battery cell unit to be opened and the second switch to be closed.
9. The battery equalization system of claim 8, comprising a voltage transformation charge-discharge module,
the voltage transformation charging and discharging module comprises a DCDC unit and a charging and discharging unit, the battery cell unit is connected with the voltage transformation charging and discharging module through a third switch, and the control module is used for controlling the third switch to be closed when the battery is in a power-down state;
if the voltage of the battery cell unit is higher than a fifth threshold value, the control module is used for controlling the battery cell unit to charge the charging and discharging unit through DCDC;
and if the voltage of the battery cell unit is lower than a sixth threshold value, the control module is used for controlling the charging and discharging unit to charge the battery cell unit through DCDC.
10. The battery equalization system of any of claims 6-9, wherein,
the detection unit is used for detecting the charge state and the voltage of the battery cell unit;
and when the charge state of the battery cell unit does not exceed a first threshold value and the difference value between the voltage and the minimum voltage is larger than a second threshold value, the battery cell unit is in an equilibrium state, and the detection module is used for forming a control instruction.
11. A vehicle comprising a battery equalization system as claimed in any one of claims 6-10.
CN202210549592.7A 2022-05-20 2022-05-20 Battery equalization method and system and vehicle Pending CN117124930A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210549592.7A CN117124930A (en) 2022-05-20 2022-05-20 Battery equalization method and system and vehicle

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Application Number Priority Date Filing Date Title
CN202210549592.7A CN117124930A (en) 2022-05-20 2022-05-20 Battery equalization method and system and vehicle

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CN117124930A true CN117124930A (en) 2023-11-28

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