CN115208011A - Lithium battery charging and discharging control device, method and system - Google Patents

Lithium battery charging and discharging control device, method and system Download PDF

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Publication number
CN115208011A
CN115208011A CN202210813716.8A CN202210813716A CN115208011A CN 115208011 A CN115208011 A CN 115208011A CN 202210813716 A CN202210813716 A CN 202210813716A CN 115208011 A CN115208011 A CN 115208011A
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CN
China
Prior art keywords
lithium battery
relay
electric quantity
preset
battery unit
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Pending
Application number
CN202210813716.8A
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Chinese (zh)
Inventor
段世忠
刘爽
张毅
苏毅
李溢群
严晓光
李晓明
顾晔
干伟灿
周伟剑
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Dongfeng Trucks Co ltd
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Dongfeng Trucks Co ltd
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Priority to CN202210813716.8A priority Critical patent/CN115208011A/en
Publication of CN115208011A publication Critical patent/CN115208011A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
    • B60R16/033—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for characterised by the use of electrical cells or batteries
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00306—Overdischarge protection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/14—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
    • H02J7/1415—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle with a generator driven by a prime mover other than the motor of a vehicle
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/14—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
    • H02J7/1423—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle with multiple batteries
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/342—The other DC source being a battery actively interacting with the first one, i.e. battery to battery charging
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/36—Arrangements using end-cell switching

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

The invention discloses a lithium battery charging and discharging control device, method and system, relating to the technical field of automobile battery control and comprising the following steps: the parking air conditioner comprises a lithium battery module and a control module, wherein the lithium battery module is provided with a lithium battery unit, a negative terminal, a first positive terminal and a second positive terminal, a first relay and a second relay are respectively arranged between the first positive terminal and the positive terminal of the lithium battery unit and between the second positive terminal and the positive terminal of the lithium battery unit, the first positive terminal is connected with the positive output end of a vehicle generator and the positive electrode of a lead-acid storage battery, and the second positive terminal is connected with the positive input end of the parking air conditioner; the control module is used for controlling the first relay and the second relay to be switched on or switched off so as to charge or discharge the lithium battery unit. The invention separates the charging and discharging of the lithium battery unit, and discharges to the parking air conditioner independently, thereby avoiding the power shortage caused by the discharging of the lead-acid storage battery to the parking air conditioner, avoiding the power shortage caused by the over-discharging of the lithium battery unit, and ensuring the normal starting of the vehicle and the parking air conditioner.

Description

Lithium battery charging and discharging control device, method and system
Technical Field
The invention relates to the technical field of automobile battery control, in particular to a lithium battery charging and discharging control device, method and system.
Background
At present, a lead-acid storage battery configured for a cargo vehicle is connected with a vehicle generator in parallel to form a double-power-supply system with the vehicle generator, and when the vehicle generator does not generate electricity, the lead-acid storage battery supplies power for all vehicle electric equipment. When summer comes, in order to solve the influence of high temperature on drivers and passengers, the vehicle is provided with a parking air conditioner. Because the parking air conditioner is mainly used during parking, an engine of a vehicle does not run, and the power supply of the parking air conditioner can be provided by the lead-acid storage battery, the power consumption of the parking air conditioner is high, the lead-acid storage battery configured in the original vehicle cannot meet the power consumption requirement of the parking air conditioner, and the service life of the battery can be shortened by overdischarging. In order to meet the power demand of the parking air conditioner, the most common method is to increase the capacity of the lead-acid storage battery. However, the lead-acid storage battery has the characteristics of large volume, low energy density, incapability of deep cyclic discharge and the like, so that the capacity of the lead-acid storage battery in a limited space of a vehicle is increased to a limited extent, and the power consumption requirement of a parking air conditioner of the vehicle cannot be completely met.
The lithium battery has the advantages of high energy density, long service life, small occupied space, high charge-discharge rate and the like, so that the lithium battery is more and more widely applied to automobiles, and an automobile manufacturer additionally configures a set of lithium battery for power supply. However, in the vehicle equipped with the lithium battery for the parking air conditioner, the vehicle generator, the lead-acid storage battery, and the lithium battery are connected in a direct parallel manner. When the parking air conditioner works, the electric quantity of the lead-acid storage battery and the lithium battery is consumed to be almost full, and the vehicle and the parking air conditioner cannot be started.
Disclosure of Invention
The embodiment of the invention provides a lithium battery charge and discharge control device, method and system, and aims to solve the technical problems that in the related technology, a vehicle generator, a lead-acid storage battery and a lithium battery are connected in a direct parallel mode, and the lead-acid storage battery and the lithium battery are directly used for discharging electricity to a parking air conditioner, so that the electric quantity of the lead-acid storage battery and the lithium battery is consumed and the electricity is lost, and the vehicle and the parking air conditioner cannot be started.
In a first aspect, a lithium battery charging and discharging control device is provided, including:
the parking air conditioner comprises a lithium battery module, a power supply module and a control module, wherein the lithium battery module is provided with a lithium battery unit, a negative terminal, a first positive terminal and a second positive terminal, the negative terminal is connected with a negative electrode of the lithium battery unit, and the negative terminal is also connected with a negative output end of a vehicle generator, a negative end of a lead-acid storage battery and a negative input end of a parking air conditioner; the first positive terminal and the second positive terminal are both connected with the positive electrode of the lithium battery unit, a first relay and a second relay are respectively arranged between the first positive terminal and the positive electrode of the lithium battery unit and between the second positive terminal and the positive electrode of the lithium battery unit, the first positive terminal is connected with the positive output end of the vehicle generator and the positive electrode of the lead-acid storage battery, and the second positive terminal is connected with the positive input end of the parking air conditioner;
a control module configured to: the control module is used for controlling the first relay and the second relay to be switched on or switched off according to the working state of the vehicle generator, the actual electric quantity of the lithium battery unit and the actual voltage of the lead-acid storage battery, so that the lithium battery unit is charged by the vehicle generator or the lead-acid storage battery, or the lithium battery unit discharges to the lead-acid storage battery or the parking air conditioner.
In some embodiments, when the vehicle generator is operating:
if the actual electric quantity of the lithium battery unit is smaller than a preset first electric quantity threshold value, the control module is used for controlling a first relay to be switched on and a second relay to be switched off until the actual electric quantity of the lithium battery unit is larger than a preset second electric quantity threshold value, and then controlling the first relay to be switched off; wherein the preset first electric quantity threshold value is less than the preset second electric quantity threshold value;
if the actual electric quantity of the lithium battery unit is between a preset first electric quantity threshold value and a preset second electric quantity threshold value, the control module is used for controlling a first relay to be switched on and a second relay to be switched on or off;
and if the actual electric quantity of the lithium battery unit is larger than a preset second electric quantity threshold value, the control module is used for controlling the first relay to be disconnected and controlling the second relay to be connected or disconnected.
In some embodiments, when the vehicle generator is not operating:
if the actual voltage of the lead-acid storage battery is greater than the preset starting voltage and the actual electric quantity of the lithium battery unit is smaller than the preset first electric quantity threshold value, the control module is used for controlling the first relay to be switched on and the second relay to be switched off;
if the actual voltage of the lead-acid storage battery is greater than the preset starting voltage and the actual electric quantity of the lithium battery unit is between the preset first electric quantity threshold and the preset second electric quantity threshold, the control module is used for controlling the first relay to be connected and controlling the second relay to be connected or disconnected;
if the actual voltage of the lead-acid storage battery is larger than the preset starting voltage and the actual electric quantity of the lithium battery unit is larger than the preset second electric quantity threshold value, the control module is used for controlling the first relay to be disconnected and controlling the second relay to be connected or disconnected;
if the actual voltage of the lead-acid storage battery is smaller than the preset starting voltage and the actual electric quantity of the lithium battery unit is larger than the preset first electric quantity threshold value, the control module is used for controlling the first relay to be switched on and the second relay to be switched off until the actual voltage of the lead-acid storage battery is larger than the preset starting voltage, and then controlling the first relay to be switched off;
and if the actual voltage of the lead-acid storage battery is smaller than the preset starting voltage and the actual electric quantity of the lithium battery unit is smaller than the preset first electric quantity threshold value, the control module is used for controlling the second relay to be switched off.
In some embodiments, when the control module controls the second relay to be turned on, it is determined whether the temperature of the lithium battery unit is within a preset temperature range, and it is also determined whether the discharge current of the lithium battery unit is greater than a preset discharge current threshold;
if the temperature of the lithium battery unit is within the preset temperature range and the discharge current of the lithium battery unit is larger than the preset discharge current threshold value, controlling the second relay to be kept on; otherwise, the second relay is controlled to be disconnected.
In some embodiments, the first relay and the second relay are both electromagnetic relays.
In a second aspect, a lithium battery charging and discharging control method is provided, which includes the following steps:
and controlling the connection or disconnection of the first relay and the second relay according to the working state of the vehicle generator, the actual electric quantity of the lithium battery unit and the actual voltage of the lead-acid storage battery, so that the lithium battery unit is charged by the vehicle generator or the lead-acid storage battery, or the lithium battery unit discharges to the lead-acid storage battery or the parking air conditioner.
In some embodiments, the step of controlling the first relay and the second relay to be turned on or off according to the operating state of the vehicle generator, the actual capacity of the lithium battery unit, and the actual voltage of the lead-acid storage battery, so that the lithium battery unit is charged by the vehicle generator or the lead-acid storage battery, or so that the lithium battery unit discharges to the lead-acid storage battery or the parking air conditioner includes:
when the vehicle generator is operating:
if the actual electric quantity of the lithium battery unit is smaller than a preset first electric quantity threshold value, controlling the first relay to be switched on and the second relay to be switched off until the actual electric quantity of the lithium battery unit is larger than a preset second electric quantity threshold value, and then controlling the first relay to be switched off; the preset first electric quantity threshold value is smaller than the preset second electric quantity threshold value;
if the actual electric quantity of the lithium battery unit is between a preset first electric quantity threshold value and a preset second electric quantity threshold value, controlling the first relay to be connected and controlling the second relay to be connected or disconnected;
and if the actual electric quantity of the lithium battery unit is larger than the preset second electric quantity threshold value, the first relay is controlled to be disconnected, and the second relay is controlled to be connected or disconnected.
In some embodiments, the step of controlling the first relay and the second relay to be turned on or off according to the operating state of the vehicle generator, the actual capacity of the lithium battery unit, and the actual voltage of the lead-acid storage battery, so that the lithium battery unit is charged by the vehicle generator or the lead-acid storage battery, or so that the lithium battery unit is discharged to the lead-acid storage battery or the parking air conditioner further includes:
when the vehicle generator is not operating:
if the actual voltage of the lead-acid storage battery is greater than the preset starting voltage and the actual electric quantity of the lithium battery unit is smaller than the preset first electric quantity threshold value, controlling the first relay to be switched on and the second relay to be switched off;
if the actual voltage of the lead-acid storage battery is greater than the preset starting voltage and the actual electric quantity of the lithium battery unit is between the preset first electric quantity threshold value and the preset second electric quantity threshold value, controlling the first relay to be connected and controlling the second relay to be connected or disconnected;
if the actual voltage of the lead-acid storage battery is larger than the preset starting voltage and the actual electric quantity of the lithium battery unit is larger than the preset second electric quantity threshold value, the first relay is controlled to be switched off, and the second relay is controlled to be switched on or switched off;
if the actual voltage of the lead-acid storage battery is smaller than the preset starting voltage and the actual electric quantity of the lithium battery unit is larger than the preset first electric quantity threshold value, controlling the first relay to be connected and the second relay to be disconnected until the actual voltage of the lead-acid storage battery is larger than the preset starting voltage, and then controlling the first relay to be disconnected;
and if the actual voltage of the lead-acid storage battery is smaller than the preset starting voltage and the actual electric quantity of the lithium battery unit is smaller than the preset first electric quantity threshold value, controlling the second relay to be switched off.
In some embodiments, when the second relay is controlled to be turned on, whether the temperature of the lithium battery unit is within a preset temperature range or not is judged, and whether the discharge current of the lithium battery unit is greater than a preset discharge current threshold or not is also judged;
if the temperature of the lithium battery unit is within the preset temperature range and the discharge current of the lithium battery unit is larger than the preset discharge current threshold value, controlling the second relay to be kept on; otherwise, the second relay is controlled to be disconnected.
In a third aspect, a lithium battery charging and discharging control system is provided, which includes the foregoing lithium battery charging and discharging control device.
The technical scheme provided by the invention has the beneficial effects that:
the embodiment of the invention provides a lithium battery charging and discharging control device, method and system, which are provided with a lithium battery module and a control module, wherein the lithium battery module is provided with a lithium battery unit, a negative terminal, a first positive terminal and a second positive terminal, a first relay and a second relay are respectively arranged between the first positive terminal and the positive terminal of the lithium battery unit and between the second positive terminal and the positive terminal of the lithium battery unit, the first positive terminal is connected with a positive output end of a vehicle generator and a positive electrode of a lead-acid storage battery, the second positive terminal is connected with a positive input end of a parking air conditioner, the control module controls the charging and discharging state of the lithium battery unit according to the working state of the vehicle generator, the actual electric quantity of the lithium battery unit and the actual voltage of the lead-acid storage battery, so that the charging and discharging of the lithium battery unit are separated, the lithium battery unit discharges to the parking air conditioner independently, the phenomenon that the electric quantity is consumed completely due to the direct discharge of the lead-acid storage battery to the parking air conditioner is avoided, and the normal starting of a vehicle is ensured. Meanwhile, the actual electric quantity of the lithium battery unit is considered, excessive discharging of the lithium battery unit is avoided, the electric quantity of the lithium battery unit is consumed completely, and normal starting of the parking air conditioner is guaranteed.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic diagram of a lithium battery charge and discharge control device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating control of charging and discharging of a lithium battery during operation of a vehicle engine according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating controlling charging and discharging of a lithium battery when a vehicle engine is not operating according to an embodiment of the present invention;
in the figure:
1. a lithium battery module; 11. a lithium battery cell; 12. a negative terminal; 13. a first positive terminal; 14. a second positive terminal; 15. a first relay; 16. a second relay;
2. a control module;
3. a vehicle generator;
4. a lead-acid battery;
5. parking air conditioner.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The embodiment of the invention provides a lithium battery charging and discharging control device which can solve the technical problem that in the prior art, a vehicle generator, a lead-acid storage battery and a lithium battery are connected in a direct parallel connection mode, and the lead-acid storage battery and the lithium battery are directly used for discharging electricity to a parking air conditioner, so that the electric quantity of the lead-acid storage battery and the electric quantity of the lithium battery are consumed almost completely, and the vehicle and the parking air conditioner cannot be started.
Referring to fig. 1, an embodiment of the present invention provides a lithium battery charge and discharge control device, including: lithium battery module 1 and control module 2, lithium battery module 1 is equipped with lithium cell 11, negative terminal 12, first positive terminal 13 and second positive terminal 14.
The negative terminal 11 is connected with the negative electrode of the lithium battery unit 11, and the negative terminal 12 is further connected with the negative output end of the vehicle generator 3, the negative end of the lead-acid storage battery 4 and the negative input end of the parking air conditioner 5.
First positive terminal 13 and second positive terminal 14 all with lithium cell 11's anodal is connected, just first positive terminal 13 and second positive terminal 14 with be equipped with first relay 15 and second relay 16 between lithium cell 11's the positive pole respectively, first positive terminal 13 is connected with vehicle generator 3's positive output end and lead acid battery 4's positive pole, second positive terminal 14 is connected with parking air conditioner 5's positive input.
The control module 2 is configured to: the control module 2 is configured to control the first relay 15 and the second relay 16 to be turned on or off according to the operating state of the vehicle generator 3, the actual electric quantity of the lithium battery unit 11, and the actual voltage of the lead-acid storage battery 4, so that the lithium battery unit 11 is charged by the vehicle generator 3 or the lead-acid storage battery 4, or so that the lithium battery unit 11 discharges to the lead-acid storage battery 4 or the parking air conditioner 5.
The lithium battery charging and discharging control device is provided with a lithium battery module and a control module, wherein the lithium battery module is provided with a lithium battery unit, a negative terminal, a first positive terminal and a second positive terminal, a first relay and a second relay are respectively arranged between the first positive terminal and the positive terminal of the lithium battery unit, the first positive terminal is connected with a positive output end of a vehicle generator and a positive electrode of a lead-acid storage battery, the second positive terminal is connected with a positive input end of a parking air conditioner, the control module controls the charging and discharging state of the lithium battery unit according to the working state of the vehicle generator, the actual electric quantity of the lithium battery unit and the actual voltage of the lead-acid storage battery, so that the lithium battery unit is charged and discharged separately to the parking air conditioner, the lithium battery unit is prevented from directly discharging to the parking air conditioner, the electric quantity is prevented from being almost exhausted, and the vehicle is ensured to be normally started. The actual electric quantity of the lithium battery unit is considered, excessive discharge of the lithium battery unit is avoided, the electric quantity of the lithium battery unit is consumed, so that the electricity is lost completely, and the parking air conditioner is guaranteed to be normally started.
As an alternative embodiment, in one inventive embodiment, as shown in fig. 2, when the vehicle generator 3 is operated:
if the actual electric quantity of the lithium battery unit 11 is smaller than the preset first electric quantity threshold value SOC 1 Then, the control module 2 is configured to control the first relay 15 to be turned on and the second relay 16 to be turned off until the actual electric quantity of the lithium battery unit 11 is greater than a preset second electric quantity threshold SOC 2 And then controls the first relay 15 to be turned off. Wherein, a first electric quantity threshold value SOC is preset 1 < Preset second electric quantity threshold value SOC 2 . Presetting a first electric quantity threshold value SOC 1 The minimum electric quantity value for discharging the lithium battery unit 11 can be determined by calibration; presetting a second electric quantity threshold value SOC 2 The maximum amount of electricity to charge the lithium battery cell 11 may be determined by calibration. At this time, the lithium battery unit 11 has low electric quantity, is not allowed to discharge, is allowed to charge, protects the lithium battery, and prolongs the service life of the lithium battery.
If the actual electric quantity of the lithium battery unit 11 is between the preset first electric quantity threshold value SOC 1 And presetting a second electric quantity threshold value SOC 2 Meanwhile, the control module 2 is used for controlling the first relay 15 to be turned on and controlling the second relay 16 to be turned on or off. At this time, the lithium battery cell 11 has a sufficient amount of electricity to allow charging and also to allow discharging.
If the actual electric quantity of the lithium battery unit 11 is larger than the preset second electric quantity threshold value SOC 2 The control module 2 is used to control the first relay 15 to be turned off and control the second relay 16 to be turned on or off. At this time, the lithium battery unit 11 has sufficient electric quantity, charging is not allowed, discharging is allowed, overcharge is avoided, the lithium battery is protected, and the service life of the lithium battery is prolonged.
As an alternative embodiment, in one inventive embodiment, referring to fig. 3, when the vehicle generator 3 is not operating:
if the actual voltage of the lead-acid storage battery 4 is greater than the preset starting voltage and the actual electric quantity of the lithium battery unit 11 is less than the preset first electric quantity threshold value, the control module 2 is configured to control the first relay 15 to be turned on and the second relay 16 to be turned off. At this moment, lithium battery unit 11's electric quantity is lower, does not allow to discharge, allows lead acid battery 4 to charge to lithium battery unit 11, avoids the lithium cell insufficient voltage, protects the lithium cell, extension lithium cell life.
If the actual voltage of the lead-acid storage battery 4 is greater than the preset starting voltage and the actual electric quantity of the lithium battery unit 11 is between the preset first electric quantity threshold and the preset second electric quantity threshold, the control module 2 is configured to control the first relay 15 to be turned on and control the second relay 16 to be turned on or off. At this time, the lithium battery cell 11 has a sufficient amount of electricity, allowing charging and also discharging. In a special case where the amount of electricity of the lithium battery cell 11 is sufficient, in order to extend the use time of the parking air conditioner 5, the lead-acid storage battery 4 may be temporarily used, and discharged to the parking air conditioner 5 together with the lithium battery cell 11.
If the actual voltage of the lead-acid storage battery 4 is greater than the preset starting voltage and the actual electric quantity of the lithium battery unit 11 is greater than the preset second electric quantity threshold, the control module 2 is configured to control the first relay 15 to be turned off and control the second relay 16 to be turned on or turned off. At this time, the lithium battery unit 11 has sufficient electric quantity, charging is not allowed, discharging is allowed, overcharge is avoided, the lithium battery is protected, and the service life of the lithium battery is prolonged.
If the actual voltage of the lead-acid storage battery 4 is smaller than the preset starting voltage and the actual electric quantity of the lithium battery unit 11 is larger than the preset first electric quantity threshold value, the control module 2 is used for controlling the first relay 15 to be switched on and the second relay 16 to be switched off until the actual voltage of the lead-acid storage battery 4 is larger than the preset starting voltage, and then controlling the first relay 15 to be switched off. At this moment, allow lithium battery unit 11 to charge to lead acid battery 4, avoid lead acid battery insufficient voltage, protect lead acid battery, extension lead acid battery life realizes that lithium battery unit 11 and lead acid battery 4 have the condition to charge each other promptly, avoids insufficient voltage, extension lead acid battery and lithium cell life.
If the actual voltage of lead-acid storage battery 4 is less than preset starting voltage and the actual electric quantity of lithium battery unit 11 is less than preset first electric quantity threshold, then control module 2 is used for controlling the disconnection of second relay 16, forbids discharging, avoids the further aggravation of insufficient point phenomenon, prolongs lead-acid storage battery and lithium battery life.
As an optional implementation manner, in an embodiment of the present invention, when the control module 2 controls the second relay 16 to be turned on, it is determined whether the temperature of the lithium battery cell 11 is within a preset temperature range, and it is also determined whether the discharge current of the lithium battery cell 11 is greater than a preset discharge current threshold I. Wherein the preset temperature range is the minimum temperature threshold T of the lithium battery unit 11 during discharging 1 And a maximum threshold value T 2 Formed interval T 1 ，T 2 Determined by calibration; the preset discharge current threshold I is the minimum discharge current value of the lithium battery cell 11, and may be determined by calibration.
If the temperature of the lithium battery unit 11 is within the preset temperature range and the discharge current of the lithium battery unit 11 is greater than the preset discharge current threshold value I, controlling the second relay 16 to keep on; otherwise, the second relay 16 is controlled to be opened.
The lithium battery unit 11 is enabled to work in the optimum parameter state, and the service life of the lithium battery is prolonged.
As an optional implementation manner, in an embodiment of the invention, the first relay 15 and the second relay 16 are both electromagnetic relays, so that the cost is low and the controllability is good.
The embodiment of the invention provides a lithium battery charging and discharging control method, which comprises the following steps:
and controlling the connection or disconnection of the first relay 15 and the second relay 16 according to the working state of the vehicle generator 3, the actual electric quantity of the lithium battery unit 11 and the actual voltage of the lead-acid storage battery 4, so that the battery unit is charged by the vehicle generator 3 or the lead-acid storage battery 4, or the battery unit is discharged to the lead-acid storage battery 4 or the parking air conditioner 5.
As an alternative embodiment, in an embodiment of the present invention, the step of controlling the on or off of the first relay 15 and the second relay 16 according to the operating state of the vehicle generator 3, the actual charge of the lithium battery unit 11, and the actual voltage of the lead-acid battery 4, so that the lithium battery unit 11 is charged by the vehicle generator 3 or the lead-acid battery 4, or so that the lithium battery unit 11 discharges to the lead-acid battery 4 or the parking air conditioner 5, includes:
when the vehicle generator 3 is operated:
if the actual electric quantity of the lithium battery unit 11 is smaller than the preset first electric quantity threshold value, controlling the first relay 15 to be switched on and the second relay 16 to be switched off until the actual electric quantity of the lithium battery unit 11 is larger than the preset second electric quantity threshold value, and then controlling the first relay 15 to be switched off; wherein the preset first electric quantity threshold value is less than the preset second electric quantity threshold value.
If the actual electric quantity of the lithium battery unit 11 is between the preset first electric quantity threshold and the preset second electric quantity threshold, the first relay 15 is controlled to be switched on, and the second relay 16 is controlled to be switched on or off.
And if the actual electric quantity of the lithium battery unit 11 is greater than the preset second electric quantity threshold value, controlling the first relay 15 to be disconnected, and controlling the second relay 16 to be connected or disconnected.
As an optional implementation manner, in an embodiment of the invention, the step of controlling the first relay 15 and the second relay 16 to be turned on or off according to the operating state of the vehicle generator 3, the actual charge of the lithium battery unit 11, and the actual voltage of the lead-acid battery 4, so that the lithium battery unit 11 is charged by the vehicle generator 3 or the lead-acid battery 4, or so that the lithium battery unit 11 discharges to the lead-acid battery 4 or the parking air conditioner 5 further includes:
when the vehicle generator 3 is not operating:
and if the actual voltage of the lead-acid storage battery 4 is greater than the preset starting voltage and the actual electric quantity of the lithium battery unit 11 is less than the preset first electric quantity threshold value, controlling the first relay 15 to be switched on and the second relay 16 to be switched off.
And if the actual voltage of the lead-acid storage battery 4 is greater than the preset starting voltage and the actual electric quantity of the lithium battery unit 11 is between the preset first electric quantity threshold and the preset second electric quantity threshold, controlling the first relay 15 to be switched on and controlling the second relay 16 to be switched on or off.
And if the actual voltage of the lead-acid storage battery 4 is greater than the preset starting voltage and the actual electric quantity of the lithium battery unit 11 is greater than the preset second electric quantity threshold value, controlling the first relay 15 to be switched off and controlling the second relay 16 to be switched on or switched off.
And if the actual voltage of the lead-acid storage battery 4 is smaller than the preset starting voltage and the actual electric quantity of the lithium battery unit 11 is larger than the preset first electric quantity threshold value, controlling the first relay 15 to be switched on and the second relay 16 to be switched off until the actual voltage of the lead-acid storage battery 4 is larger than the preset starting voltage, and then controlling the first relay 15 to be switched off.
And if the actual voltage of the lead-acid storage battery 4 is smaller than the preset starting voltage and the actual electric quantity of the lithium battery unit 11 is smaller than the preset first electric quantity threshold value, controlling the second relay 16 to be switched off.
As an optional implementation manner, in an embodiment of the present invention, when controlling the second relay 16 to be turned on, it is determined whether the temperature of the lithium battery cell 11 is within a preset temperature range, and it is also determined whether the discharge current of the lithium battery cell 11 is greater than a preset discharge current threshold.
If the temperature of the lithium battery unit 11 is within the preset temperature range and the discharge current of the lithium battery unit 11 is greater than the preset discharge current threshold, controlling the second relay 16 to keep on; otherwise, the second relay 16 is controlled to be opened.
The embodiment of the invention provides a lithium battery charging and discharging control system which comprises the lithium battery charging and discharging control device.
In the description of the present invention, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly and encompass, for example, both fixed and removable coupling as well as integral coupling; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
It is to be noted that, in the present invention, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A lithium battery charge and discharge control device is characterized by comprising:
the lithium battery module (1) is provided with a lithium battery unit (11), a negative terminal (12), a first positive terminal (13) and a second positive terminal (14), wherein the negative terminal (12) is connected with a negative electrode of the lithium battery unit (11), and the negative terminal (12) is also connected with a negative electrode output end of a vehicle generator (3), a negative electrode end of a lead-acid storage battery (4) and a negative electrode input end of a parking air conditioner (5); the first positive terminal (13) and the second positive terminal (14) are both connected with the positive electrode of the lithium battery unit (11), a first relay (15) and a second relay (16) are respectively arranged between the first positive terminal (13) and the positive electrode of the lithium battery unit (11) and between the second positive terminal (14) and the positive electrode of the lithium battery unit (11), the first positive terminal (13) is connected with the positive electrode output end of the vehicle generator (3) and the positive electrode of the lead-acid storage battery (4), and the second positive terminal (14) is connected with the positive electrode input end of the parking air conditioner (5);
a control module (2) configured to: the control module (2) is used for controlling the first relay (15) and the second relay (16) to be switched on or off according to the working state of the vehicle generator (3), the actual electric quantity of the lithium battery unit (11) and the actual voltage of the lead-acid storage battery (4), so that the lithium battery unit (11) is charged by the vehicle generator (3) or the lead-acid storage battery (4), or the lithium battery unit (11) is discharged to the lead-acid storage battery (4) or the parking air conditioner (5).
2. The lithium battery charge and discharge control device according to claim 1, wherein:
when the vehicle generator (3) is operating:
if the actual electric quantity of the lithium battery unit (11) is smaller than a preset first electric quantity threshold value, the control module (2) is used for controlling the first relay (15) to be switched on and controlling the second relay (16) to be switched off until the actual electric quantity of the lithium battery unit (11) is larger than the preset second electric quantity threshold value, and then controlling the first relay (15) to be switched off; wherein the preset first electric quantity threshold value is less than the preset second electric quantity threshold value;
if the actual electric quantity of the lithium battery unit (11) is between a preset first electric quantity threshold value and a preset second electric quantity threshold value, the control module (2) is used for controlling the first relay (15) to be switched on and controlling the second relay (16) to be switched on or switched off;
if the actual electric quantity of the lithium battery unit (11) is larger than a preset second electric quantity threshold value, the control module (2) is used for controlling the first relay (15) to be disconnected and controlling the second relay (16) to be connected or disconnected.
3. The lithium battery charge and discharge control device according to claim 2, wherein:
when the vehicle generator (3) is not operating:
if the actual voltage of the lead-acid storage battery (4) is greater than the preset starting voltage and the actual electric quantity of the lithium battery unit (11) is smaller than the preset first electric quantity threshold value, the control module (2) is used for controlling the first relay (15) to be switched on and the second relay (16) to be switched off;
if the actual voltage of the lead-acid storage battery (4) is greater than the preset starting voltage and the actual electric quantity of the lithium battery unit (11) is between the preset first electric quantity threshold and the preset second electric quantity threshold, the control module (2) is used for controlling the first relay (15) to be connected and controlling the second relay (16) to be connected or disconnected;
if the actual voltage of the lead-acid storage battery (4) is greater than a preset starting voltage and the actual electric quantity of the lithium battery unit (11) is greater than a preset second electric quantity threshold value, the control module (2) is used for controlling the first relay (15) to be switched off and controlling the second relay (16) to be switched on or switched off;
if the actual voltage of the lead-acid storage battery (4) is smaller than the preset starting voltage and the actual electric quantity of the lithium battery unit (11) is larger than the preset first electric quantity threshold, the control module (2) is used for controlling the first relay (15) to be switched on and controlling the second relay (16) to be switched off until the actual voltage of the lead-acid storage battery (4) is larger than the preset starting voltage, and then controlling the first relay (15) to be switched off;
and if the actual voltage of the lead-acid storage battery (4) is smaller than the preset starting voltage and the actual electric quantity of the lithium battery unit (11) is smaller than the preset first electric quantity threshold value, the control module (2) is used for controlling the second relay (16) to be switched off.
4. The lithium battery charge and discharge control device according to claim 3, wherein:
when the control module (2) controls the second relay (16) to be conducted, judging whether the temperature of the lithium battery unit (11) is within a preset temperature range, and also judging whether the discharge current of the lithium battery unit (11) is larger than a preset discharge current threshold;
if the temperature of the lithium battery unit (11) is within a preset temperature range and the discharge current of the lithium battery unit (11) is larger than a preset discharge current threshold value, controlling a second relay (16) to keep on; and conversely, the second relay (16) is controlled to be switched off.
5. The lithium battery charge and discharge control device according to claim 1, wherein: the first relay (15) and the second relay (16) are both electromagnetic relays.
6. A lithium battery charge and discharge control method using the lithium battery charge and discharge control device according to claim 1, characterized by comprising the steps of:
and controlling the first relay (15) and the second relay (16) to be switched on or off according to the working state of the vehicle generator (3), the actual electric quantity of the lithium battery unit (11) and the actual voltage of the lead-acid storage battery (4), so that the lithium battery unit (11) is charged by the vehicle generator (3) or the lead-acid storage battery (4), or the lithium battery unit (11) is discharged to the lead-acid storage battery (4) or the parking air conditioner (5).
7. The lithium battery charge-discharge control method according to claim 6, wherein the step of controlling the on or off of the first relay (15) and the second relay (16) according to the operating state of the vehicle generator (3), the actual capacity of the lithium battery cell (11), and the actual voltage of the lead-acid storage battery (4) so that the lithium battery cell (11) is charged by the vehicle generator (3) or the lead-acid storage battery (4), or so that the lithium battery cell (11) is discharged to the lead-acid storage battery (4) or the parking air conditioner (5) comprises:
when the vehicle generator (3) is operating:
if the actual electric quantity of the lithium battery unit (11) is smaller than a preset first electric quantity threshold value, controlling the first relay (15) to be switched on and the second relay (16) to be switched off until the actual electric quantity of the lithium battery unit (11) is larger than a preset second electric quantity threshold value, and then controlling the first relay (15) to be switched off; the preset first electric quantity threshold value is smaller than the preset second electric quantity threshold value;
if the actual electric quantity of the lithium battery unit (11) is between a preset first electric quantity threshold value and a preset second electric quantity threshold value, controlling the first relay (15) to be switched on and controlling the second relay (16) to be switched on or off;
and if the actual electric quantity of the lithium battery unit (11) is larger than a preset second electric quantity threshold value, the first relay (15) is controlled to be disconnected, and the second relay (16) is controlled to be connected or disconnected.
8. The lithium battery charge-discharge control method according to claim 7, wherein the step of controlling the on or off of the first relay (15) and the second relay (16) according to the operating state of the vehicle generator (3), the actual capacity of the lithium battery cell (11), and the actual voltage of the lead-acid storage battery (4) so that the lithium battery cell (11) is charged by the vehicle generator (3) or the lead-acid storage battery (4), or so that the lithium battery cell (11) is discharged to the lead-acid storage battery (4) or the parking air conditioner (5), further comprises:
when the vehicle generator (3) is not operating:
if the actual voltage of the lead-acid storage battery (4) is greater than the preset starting voltage and the actual electric quantity of the lithium battery unit (11) is smaller than the preset first electric quantity threshold value, controlling the first relay (15) to be switched on and the second relay (16) to be switched off;
if the actual voltage of the lead-acid storage battery (4) is greater than the preset starting voltage and the actual electric quantity of the lithium battery unit (11) is between the preset first electric quantity threshold value and the preset second electric quantity threshold value, controlling the first relay (15) to be switched on and controlling the second relay (16) to be switched on or off;
if the actual voltage of the lead-acid storage battery (4) is greater than the preset starting voltage and the actual electric quantity of the lithium battery unit (11) is greater than the preset second electric quantity threshold value, the first relay (15) is controlled to be switched off, and the second relay (16) is controlled to be switched on or switched off;
if the actual voltage of the lead-acid storage battery (4) is smaller than the preset starting voltage and the actual electric quantity of the lithium battery unit (11) is larger than the preset first electric quantity threshold value, controlling the first relay (15) to be connected and the second relay (16) to be disconnected until the actual voltage of the lead-acid storage battery (4) is larger than the preset starting voltage, and then controlling the first relay (15) to be disconnected;
and if the actual voltage of the lead-acid storage battery (4) is smaller than the preset starting voltage and the actual electric quantity of the lithium battery unit (11) is smaller than the preset first electric quantity threshold value, controlling the second relay (16) to be switched off.
9. The lithium battery charge/discharge control method according to claim 8, wherein:
when the second relay (16) is controlled to be conducted, whether the temperature of the lithium battery unit (11) is within a preset temperature range or not is judged, and whether the discharge current of the lithium battery unit (11) is larger than a preset discharge current threshold value or not is also judged;
if the temperature of the lithium battery unit (11) is within a preset temperature range and the discharge current of the lithium battery unit (11) is larger than a preset discharge current threshold value, controlling a second relay (16) to keep on; and conversely, the second relay (16) is controlled to be switched off.
10. A lithium battery charge and discharge control system characterized by comprising the lithium battery charge and discharge control device according to any one of claims 1 to 5.
CN202210813716.8A 2022-07-11 2022-07-11 Lithium battery charging and discharging control device, method and system Pending CN115208011A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210813716.8A CN115208011A (en) 2022-07-11 2022-07-11 Lithium battery charging and discharging control device, method and system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210813716.8A CN115208011A (en) 2022-07-11 2022-07-11 Lithium battery charging and discharging control device, method and system

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115742680A (en) * 2022-12-27 2023-03-07 中国重汽集团济南动力有限公司 Parking air conditioner power supply system and method of hybrid vehicle based on vehicle control unit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115742680A (en) * 2022-12-27 2023-03-07 中国重汽集团济南动力有限公司 Parking air conditioner power supply system and method of hybrid vehicle based on vehicle control unit

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