CN115021337A - Charging and discharging regulation and control device and method for battery pack - Google Patents

Charging and discharging regulation and control device and method for battery pack Download PDF

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Publication number
CN115021337A
CN115021337A CN202110867689.8A CN202110867689A CN115021337A CN 115021337 A CN115021337 A CN 115021337A CN 202110867689 A CN202110867689 A CN 202110867689A CN 115021337 A CN115021337 A CN 115021337A
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China
Prior art keywords
temperature
battery pack
detection element
charging
determining
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CN202110867689.8A
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Chinese (zh)
Inventor
张庆
邓强
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Positec Power Tools Suzhou Co Ltd
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Positec Power Tools Suzhou Co Ltd
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Priority to CN202110867689.8A priority Critical patent/CN115021337A/en
Publication of CN115021337A publication Critical patent/CN115021337A/en
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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
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
    • H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
    • H02J7/007194—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature of the battery
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • H01M10/443—Methods for charging or discharging in response to temperature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
    • 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
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • 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
    • H02J7/00309—Overheat or overtemperature 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
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
    • 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
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
    • 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)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The application relates to the technical field of battery packs, and particularly discloses a charging and discharging regulation and control device and method for a battery pack. The device comprises a temperature detection element, a correction module and a control module, wherein the temperature detection element is arranged at a preset position of the battery pack through a heat conductor; the correction module is connected with the temperature detection element and used for correcting the detection data of the temperature detection element to obtain correction data; and the control module is connected with the correction module and used for determining the temperature of the battery pack according to the correction data and regulating and controlling the charging and discharging process of the battery pack according to the temperature of the battery pack. The detection data of the temperature detection element is corrected through the correction module, and then the real temperature of the battery pack can be obtained according to the corrected data, so that the charging and discharging process of the battery pack can be regulated and controlled timely according to the real temperature of the battery pack, and the condition that the regulation and control errors are caused due to inaccurate temperature measurement of the battery pack is avoided.

Description

Charging and discharging regulation and control device and method for battery pack
Technical Field
The invention relates to the technical field of battery packs, in particular to a charging and discharging regulation and control device and method of a battery pack.
Background
With the development of energy storage technology, a battery pack is produced, a plurality of batteries are packaged together, and output voltages with different requirements are realized through the combination of series connection or parallel connection of a plurality of batteries. When the battery is used, a series of potential safety hazards are often caused by overhigh temperature, and safety accidents are very easy to happen if the working process of the battery pack cannot be regulated and controlled in time when the temperature is overhigh.
Conventionally, a heat conducting element is disposed on the surface of a battery pack, and the temperature of the heat conducting element is measured by a temperature sensing element, so as to be used as the temperature of the battery pack. However, the temperature of the heat conducting element and the actual temperature of the battery pack often have a large deviation, which causes the finally collected temperature of the battery pack to be inaccurate, and further influences the regulation and control process.
Disclosure of Invention
In view of the above, the present application provides a device and a method for controlling charging and discharging of a battery pack.
A battery pack is connected with an external device, the battery pack discharges to the external device or is charged through the external device, and the charging and discharging regulation and control device is used for regulating and controlling the charging and discharging process of the battery pack; the charge and discharge regulation and control device comprises:
the temperature detection element is arranged at a preset position of the battery pack through a heat conductor;
the correction module is connected with the temperature detection element and used for correcting the detection data of the temperature detection element to obtain correction data;
and the control module is connected with the correction module and used for determining the temperature of the battery pack according to the correction data and regulating and controlling the charging and discharging process of the battery pack according to the temperature of the battery pack.
In one embodiment, the correction module comprises a correction element, the correction element is connected in series to the charge and discharge circuit of the battery pack and the external device, one end of the correction element is grounded, and the other end of the correction element is connected to the negative electrode of the battery pack.
In one embodiment, the temperature detection element includes a thermistor, the correction element includes a linear resistor, and the control module acquires a current value on a charge-discharge loop of the battery pack and the external device to obtain a voltage across the correction element, corrects a voltage at a first end of the thermistor according to the voltage across the correction element, and determines the temperature of the battery pack according to the corrected voltage at the first end of the thermistor.
In one embodiment, the correction module and the control module are disposed in the external device.
In one embodiment, the correction module and the control module are arranged in the battery pack;
the correction module is used for: determining a first temperature change parameter corresponding to the temperature detection element according to the detection data of the temperature detection element; determining a temperature change parameter difference value of the first temperature change parameter and a second temperature change parameter corresponding to the battery pack according to the first temperature change parameter and a preset mapping relation; and determining the temperature difference between the battery pack and the detection data of the temperature detection element according to the temperature variation parameter difference and a preset relational expression, and correcting the detection data according to the temperature difference.
In one embodiment, the battery pack includes a casing, the casing includes at least one electric core, the preset position of the battery pack is any position of the surface of the electric core or the casing, and the temperature of the battery pack includes the temperature of the electric core or the temperature of the casing.
A battery pack is connected with an external device, the battery pack discharges to the external device or is charged through the external device, and a temperature detection element is arranged at a preset position of the battery pack; the charge and discharge regulation method comprises the following steps:
acquiring detection data of the temperature detection element;
correcting the detection data to obtain corrected data;
and determining the temperature of the battery pack according to the correction data, and regulating and controlling the charging and discharging process of the battery pack according to the temperature of the battery pack.
In one embodiment, the step of correcting the detection data to obtain corrected data includes:
determining a first temperature change parameter corresponding to the temperature detection element according to the detection data;
determining a temperature change parameter difference value of a first temperature change parameter and a second temperature change parameter corresponding to the battery pack according to the first temperature change parameter and a preset mapping relation, wherein the preset mapping relation represents a corresponding relation between the first temperature change parameter and the temperature change parameter difference value;
determining a temperature difference value between the temperature of the battery pack and the detection data of the temperature detection element according to the temperature variation parameter difference value and a preset relational expression, wherein the preset relational expression represents a corresponding relation between the temperature variation parameter difference value and the temperature difference value;
and correcting the detection data according to the temperature difference.
In one embodiment, the step of acquiring the detection data of the temperature detection element includes:
sampling a plurality of detection data of the temperature detection element according to a preset time interval;
the step of determining a first temperature variation parameter corresponding to the temperature detection element according to the detection data comprises:
and determining a first temperature change parameter of the temperature detection element in a time interval according to the detection data of the temperature detection element sampled at the current sampling moment and the last sampling moment and the time interval.
In one embodiment, before the step of determining the first temperature variation parameter corresponding to the temperature detection element according to the detection data, the charge and discharge control method includes:
setting a plurality of reference temperatures;
when the detection data reaches any one reference temperature, acquiring a time interval between the current sampling moment and the last sampling moment, wherein the last sampling moment is the moment when the detection data of the temperature detection element reaches the last reference temperature;
the step of determining a first temperature variation parameter corresponding to the temperature detection element according to the detection data comprises:
and determining a first temperature change parameter of the temperature detection element in the time interval according to the current reference temperature, the last reference temperature and the time interval between the current sampling time and the last sampling time.
In one embodiment, before the step of determining the temperature change parameter difference between the first temperature change parameter and the second temperature change parameter corresponding to the battery pack according to the first temperature change parameter and a preset mapping relationship, the method further includes:
acquiring the discharge current of the battery pack;
and determining a preset mapping relation between the first temperature change parameter and the temperature change parameter difference value according to the discharge current.
In one embodiment, in the step of determining the temperature difference between the temperature of the battery pack and the detection data of the temperature detection element according to the temperature variation parameter difference and a preset relation, the preset relation is:
ΔT n ＝(t n -t n-1 )*ΔK n +ΔT n-1
wherein, Delta T n Is a temperature difference between the temperature of the battery pack and the detection data of the temperature detection element at the nth sampling time, t n Is the nth sampling time, t n-1 Is the (n-1) th sampling time, Δ K n At the nth sampling time, the temperature variation parameter difference value delta T between the battery pack and the temperature detection element n-1 Is the temperature difference between the battery pack and the temperature detection element at the (n-1) th sampling time.
In one embodiment, the first temperature variation parameter is a temperature variation slope of the temperature detection element, and the second temperature variation parameter is a temperature variation slope of the battery pack.
In one embodiment, the step of determining the temperature of the battery pack according to the correction data and regulating the charging and discharging process of the battery pack according to the temperature of the battery pack includes:
judging whether the temperature of the battery pack exceeds a preset range or not;
and if the current exceeds the preset range, stopping the external charging and discharging of the battery pack.
The charging and discharging regulation and control device of the battery pack is used for regulating and controlling the charging and discharging process of the battery pack and comprises a temperature detection element, a correction module and a control module, wherein the temperature detection element is arranged at a preset position of the battery pack through a heat conductor, the correction module corrects detection data output by the temperature detection element to obtain correction data, and the control module determines the temperature of the battery pack according to the correction data and regulates and controls the charging and discharging process of the battery pack according to the temperature of the battery pack. Namely, the correction module is arranged, the detection data of the temperature detection element is corrected through the correction module, and then the real temperature of the battery pack can be obtained according to the corrected data, so that the charging and discharging process of the battery pack can be regulated and controlled timely according to the real temperature of the battery pack, and the condition that the regulation and control errors are caused due to inaccurate temperature measurement of the battery pack is avoided.
Drawings
FIG. 1 is a schematic diagram of a charger connected to a battery pack;
FIG. 2 is a schematic diagram of the external device being a power tool;
fig. 3 is a schematic structural diagram of a charge and discharge control device of a battery pack according to an embodiment of the present disclosure;
FIGS. 4 and 5 are schematic views showing the assembly of the temperature sensing element;
fig. 6 is a schematic structural diagram illustrating an implementation manner of a correction module in a charge and discharge control device of a battery pack according to an embodiment of the present disclosure;
fig. 7 is a diagram illustrating an embodiment of a correction module in a charging/discharging control device of a battery pack according to an embodiment of the present disclosure;
fig. 8 is a flowchart of a charge and discharge control method for a battery pack according to a second embodiment of the present application;
fig. 9 is a flowchart of step S200 in the charge and discharge control method for a battery pack according to the second embodiment of the present application.
Description of reference numerals:
100. a battery pack; 111. an end cap; 112. wrapping the stent; 113. an accommodating cavity; 120. an electric core; 130. a heat conductor; 200. an external device; 300. a temperature detection element; 400. a correction module; 410. a sampling unit; 420. a correction element; 500. and a control module.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In order to enable a direct current electric tool to achieve high power of traditional gasoline or AC power supply, a plurality of lithium battery elements are combined to form a lithium battery pack at present, and the electric tool is powered through the lithium battery pack. For example, a plurality of lithium batteries with the capacity of more than or equal to 2AH and the voltage of nominally 4V are arranged in parallel in the lithium battery pack, and the lithium batteries are connected in series by 15 strings, so that the battery pack has the nominal voltage of 60V and the electric quantity of more than or equal to 120 WH. In addition, the charger can also charge the lithium battery pack.
When the temperature of the battery pack is beyond a safety range, if the temperature of the battery pack is not regulated in time, a series of potential safety hazards are often brought. The detection result of the temperature of the battery pack is more critical, and if the detected temperature of the battery pack is inaccurate, the timeliness of regulation and control can be influenced. At present, the temperature of the battery pack is detected mainly by a temperature sensing element. In practical application, due to the limitation of the shapes of the battery pack and the temperature sensing element, the temperature sensing element cannot be completely attached to the battery, and the contact area between the temperature sensing element and the battery pack is small, so that the heat of the battery pack cannot be conducted to the temperature sensing element in time. Therefore, a heat conducting element, such as a heat conducting glue, is generally coated on the surface of the battery pack, and the temperature sensing element is wrapped in the heat conducting element, so as to indirectly measure the temperature of the battery pack by the temperature sensing element. However, the temperature of the heat conducting element deviates from the actual temperature of the battery pack, and taking the heat conducting glue as an example, the heat conducting glue is affected by the characteristics (heat conductivity coefficient, thermal resistance, viscosity, etc.) of the heat conducting glue.
To obtain the actual temperature of the battery pack, the following two schemes are mainly included at present: (1) coating a heat-conducting element with high heat conductivity coefficient on the surface of the battery pack, increasing the heat-conducting power of the heat-conducting element, reducing the thermal resistance of heat-conducting glue, increasing the adhesive force between the heat-conducting element and the surface of the battery and the like; (2) the discharging power of the battery pack is reduced to slow down the temperature rise of the battery. However, both of the above two schemes have drawbacks, and in the first scheme, the cost of the heat conducting element is often increased, and the problem of temperature lag still exists, so that the problem of inaccurate temperature detection cannot be thoroughly solved; in the second way, reducing the discharge power of the battery pack may cause the user experience to be poor, and affect the normal and efficient use of the battery pack.
Based on the above problems, the present application provides a charging and discharging regulation and control device and a charging and discharging regulation and control method for a battery pack, which are used for regulating and controlling the charging and discharging process of the battery pack.
Example one
Referring to fig. 1 and 2, the battery pack 100 is connected to an external device 200, the battery pack 100 is discharged to the external device 200 or charged through the external device 200, and the charge and discharge control device is used for controlling a charge and discharge process of the battery pack 100.
Referring to fig. 3, the charging/discharging control apparatus of the present embodiment includes a temperature detecting element 300, a correcting module 400, and a control module 500. The temperature sensing element 300 is disposed at a predetermined position of the battery pack 100 through the heat conductor 130; the correcting module 400 is connected to the temperature detecting element 300, and is configured to correct the detection data of the temperature detecting element 300 to obtain corrected data; the control module 500 is connected to the correction module 400, and is configured to determine the temperature of the battery pack 100 according to the correction data, and regulate the charging and discharging process of the battery pack 100 according to the temperature of the battery pack 100.
In the above charging and discharging control device for the battery pack 100, the temperature detecting element 300 is disposed at a preset position of the battery pack 100 through the heat conductor 130, the correcting module 400 corrects the detection data output by the temperature detecting element 300 to obtain corrected data, and the control module 500 determines the temperature of the battery pack 100 according to the corrected data and controls the charging and discharging process of the battery pack 100 according to the temperature of the battery pack 100. That is, the correction module 400 is provided, and the detection data of the temperature detection element 300 is corrected by the correction module 400, so that the real temperature of the battery pack 100 can be obtained according to the corrected data, and therefore, the charging and discharging processes of the battery pack 100 can be regulated and controlled timely according to the real temperature of the battery pack 100, and the condition that the regulation and control are failed due to the fact that the real temperature of the battery pack 100 cannot be detected is avoided.
In the present embodiment, the external device 200 may include any one of a power tool and a charger. When the external device 200 is an electric tool, the battery pack 100 supplies power to the electric tool, the battery pack 100 discharges, fig. 2 shows a grass trimmer, the battery pack 100 can be connected with the grass trimmer through an electrode holder, and the battery pack 100 supplies power to the grass trimmer; when the external device 200 is a charger, the charger supplies power to the battery pack 100, and the battery pack 100 is charged, and fig. 1 shows the charger, the battery pack 100 may be connected to the charger through an electrode holder. The charging control device is used to control the charging process or the discharging process of the battery pack 100.
In one embodiment, the battery pack 100 includes a casing, the casing includes at least one battery cell 120, the preset position of the battery pack 100 is any position on the surface of the battery cell 120 or on the casing, and the temperature of the battery pack 100 includes the temperature of the battery cell 120 or the temperature of the casing.
Specifically, a plurality of battery cells 120 may be included in the casing, and the plurality of battery cells 120 are assembled into a whole in a serial and/or parallel manner. The heat conductor 130 may be coated on the surface of the battery cell 120, the casing at the position of the heat conductor 130 has a through hole communicating the inside and the outside, and the temperature detecting element 300 extends to the position of the heat conductor 130 through the through hole and is wrapped in the heat conductor 130. The heat conductor 130 can also be coated on any position of the surface of the housing, and the temperature detecting element 300 is wrapped in the heat conductor 130.
In one embodiment, referring to fig. 4 and 5, the housing may include an end cap 111 and a wrapping bracket 112, and the battery cell 120 is disposed in an inner space defined by the end cap 111 and the wrapping housing. Meanwhile, the joint of the end cap 111 and the wrapping support 112 has an accommodating cavity 113 capable of communicating with the outside and the battery cell 120, a heat conductor 130 coated on the surface of the battery cell 120 is arranged in the accommodating cavity 113, and the temperature detection element 300 extends into the accommodating cavity 113 and wraps the heat conductor 130. The thermal conductor 130 and the temperature sensing element 300 may also be located on the surface of the package support 112 or the end cap 111.
The heat conductor 130 can be made of conventional economical heat conducting glue in the field, and does not need to invest in large cost; the Temperature detecting element 300 may be an electronic component having a Negative Temperature CoeffiCient (NTC), that is, an electronic component having a resistance that decreases exponentially with a Temperature rise, such as a thermistor.
Since the temperature detected by the temperature detection element 300 is deviated from the actual temperature of the battery pack 100, the detection data of the temperature detection element 300 is corrected by the correction module 400, and the actual temperature of the battery pack 100 is determined based on the corrected result.
In one embodiment, referring to fig. 6, the modification module 400 includes a modification element 420, the modification element 420 is connected in series to the charge and discharge circuit of the battery pack 100 and the external device 200, and one end of the modification element 420 is grounded while the other end is connected to the negative electrode of the battery pack 100.
In practical applications, for example, the battery pack 100 is used to supply power to the power tool, and when the power tool is in operation, current flows from the positive electrode of the battery pack 100, passes through the load device and the correction element 420 in the power tool, and then flows into the negative electrode of the battery pack 100. The temperature detecting element 300 is attached to a predetermined position of the battery pack 100 through the heat conductor 130, and is connected to the control module 500, and a sampling unit 410 pulled up to a power source end is connected between the control module 500 and the temperature detecting element 300. The control module 500 is configured to collect the voltage at one end of the sampling unit 410 connected to the temperature detecting element 300 (i.e., the first end of the temperature detecting element 300), and further obtain the resistance value of the temperature detecting element 300, and since the temperature detecting element 300 may be an electronic component with a negative temperature coefficient, the corresponding temperature value, i.e., the temperature of the battery pack 100, may be determined according to the resistance value of the temperature detecting element 300.
In the above general process for determining the temperature of the battery pack 100, since the temperature measured by the temperature detecting element 300 is different from the actual temperature of the battery pack 100, when the battery pack 100 charges the power tool, the actual temperature of the battery pack 100 is generally higher than the temperature measured by the temperature detecting element 300, i.e., the temperature value finally determined by the control module 500 is lower than the actual temperature of the battery pack 100. Therefore, in the present embodiment, the correction element 420 is disposed on the loop formed by the battery pack 100 and the electric tool, so as to increase the resistance on the loop, when the battery pack 100 charges the electric tool, the voltage at the two ends of the correction element 420 increases with the increase of the current on the loop, the voltage at the first end of the sampling unit 410 decreases, that is, the resistance value of the temperature detection element 300 decreases, and the temperature value increases. That is, after the correction element 420 is provided, the temperature value finally determined by the control module 500 is greater than the temperature value determined when the correction element 420 is not provided, so that the deviation between the temperature detection element 300 and the actual temperature of the battery can be offset, the problem of temperature rise lag between the temperature detection element 300 and the actual temperature of the battery can be solved, and the finally determined temperature value is closer to the actual temperature of the battery pack 100.
In one embodiment, the sampling unit 410 comprises a sampling resistor, the correction element 420 comprises a linear resistor, and the temperature sensing element 300 comprises a thermistor. The control module 500 collects current values on the charge and discharge loops of the battery pack 100 and the external device 200 to obtain voltage values at two ends of the correction element 420, corrects the voltage at the first end of the thermistor according to the voltage values at two ends of the correction element 420, and determines the temperature of the battery pack 100 according to the corrected voltage at the first end of the thermistor.
The following is illustrated with one specific example:
in fig. 7, the battery PACK 100PACK is shown on the left side, and the power TOOL tol is shown on the right side, so that when the power TOOL is in operation, current flows from the battery PACK 100 to the positive side (P +), through the load device M and the linear resistor R3, and then flows into the battery PACK 100 to the negative side (P-). The thermistor T1 is attached to the surface of the battery cell 120 in the battery pack 100 through a heat-conducting adhesive. The electric tool pulls up the sampling resistor R2 to a power supply end VCC, the sampling resistor R2 is connected with the thermistor T1, the node is a point A, and the control module 500MCU in the electric tool collects the voltage of the point A, determines the resistance value of the thermistor T1 and further converts the temperature of the battery.
The conventional way for detecting the temperature of the battery pack is as follows: the upper end voltage of the thermistor T1 is detected by the control module, and when the linear resistor R3 is not arranged, Vcc takes the point B as the reference ground,
Figure BDA0003187284510000111
since the resistance RT1 of the thermistor is reduced along with the rise of the battery temperature, the temperature rise hysteresis phenomenon exists under the influence of the heat-conducting glue, namely the battery pack temperature finally determined by the control module is lower than the actual battery pack temperature.
In the present application, the temperature rise hysteresis problem can be compensated by a linear resistor R3 connected in series with the loop. Specifically, referring to FIG. 7, Vcc is referenced to point C and the upper end A of thermistor T1 is at a potential of
Figure BDA0003187284510000121
Figure BDA0003187284510000122
Wherein, I is the discharge current on the charge-discharge circuit, can see by the formula, when the battery discharge current risees, linear resistor R3 both ends voltage increases, and A point voltage then reduces, because thermistor T1's upper end voltage is with the resistance positive correlation, with the temperature negative correlation, therefore the temperature value that detects is greater than the temperature value that measures through conventional method, more approaches actual battery package temperature, and then has offset the deviation of thermistor T1 and battery actual temperature. That is, in this specific example, the purpose of temperature compensation is achieved by providing a linear resistor R3 on the loop.
When the control module 500 determines the actual temperature of the battery pack 100, it can be determined whether the actual temperature of the battery pack 100 exceeds the safe temperature range, and if so, the charging and discharging process of the battery pack 100 is stopped.
In one embodiment, the modification module 400 and the control module 500 are disposed within the external device 200. Taking an electric tool as an example, that is, the sampling unit 410, the correcting element 420 and the control module 500 are disposed in the electric tool, when the control module 500 determines that the actual temperature of the battery pack 100 exceeds the safe temperature range, the operation of the load device in the electric tool is stopped, or a charging/discharging stop command is sent to the battery pack 100, so that the charging/discharging operation of the battery pack 100 is stopped, which can achieve the purpose of regulating the charging/discharging process of the battery pack 100.
In the above, the temperature of the battery pack 100 is corrected by hardware, and in another embodiment, the temperature of the battery pack 100 may be corrected by an internal program.
The modification module 400 and the control module 500 may be both disposed in the Battery pack 100, and the modification module 400 may be a Battery Management System (BMS) inside the Battery pack 100.
The modification module 400 is configured to: determining a first temperature change parameter corresponding to the temperature detection element 300 according to the detection data of the temperature detection element 300; determining a temperature change parameter difference value of the first temperature change parameter and a second temperature change parameter corresponding to the battery pack 100 according to the first temperature change parameter and a preset mapping relation; and determining a temperature difference value between the detection data of the battery pack 100 and the temperature detection element 300 according to the temperature variation parameter difference value and a preset relation, and correcting the detection data according to the temperature difference value.
Here, the temperature change parameter refers to a parameter reflecting a temperature change, that is, the first temperature change parameter is a parameter reflecting a temperature change detected by the temperature detection element 300, and the second temperature change parameter is a parameter reflecting a temperature change of the battery pack 100. In this embodiment, it is preferable that a temperature change slope is used as the temperature change parameter, that is, the first temperature change parameter is the temperature change slope of the temperature detection element 300, and the second temperature change parameter is the temperature change slope of the battery pack 100. Of course, other parameters may be selected as the temperature variation parameter, and are not limited in particular.
According to actual tests, it is found that, in an initial state where charging and discharging are not performed, the temperature of the battery pack 100 coincides with the detected temperature of the temperature detection element 300, and when the battery pack 100 is subjected to constant-current discharge, the temperature of the battery pack 100 and the detected temperature of the temperature detection element 300 gradually increase, and due to the presence of the heat conductor 130, the deviation between the actual temperature of the battery pack 100 and the detected temperature of the temperature detection element 300 becomes larger and larger, that is, there is a difference between the first temperature variation parameter of the temperature detection element 300 and the second temperature variation parameter of the battery pack 100. The inventor creatively finds that the difference between the first temperature variation parameter and the second temperature variation parameter (referred to as temperature variation parameter difference) and the first temperature variation parameter have a corresponding relationship, so that a preset mapping relationship between the first temperature variation parameter and the temperature variation parameter difference is firstly formed.
During the correction, the correction module 400 first obtains a first temperature variation parameter of the temperature detection element 300, and then determines a temperature variation parameter difference between the first temperature variation parameter and a second temperature variation parameter according to a mapping relationship between the first temperature variation parameter and the temperature variation parameter difference formed in advance. After the temperature change parameter difference is obtained, since the temperature difference between the data detected by the battery pack 100 and the temperature detection element 300 and the temperature change parameter difference have a corresponding relationship, a relational expression is formed in advance, the temperature difference between the data detected by the battery pack 100 and the temperature detection element 300 can be determined according to the temperature change parameter difference and the preset relational expression, the detection data can be corrected according to the temperature difference, and the control module 500 can obtain the actual temperature of the battery pack 100 according to the actual temperature. When the control module 500 determines that the actual temperature of the battery pack 100 exceeds the safe temperature range, the control module sends a charge/discharge stop command to the battery pack 100 to stop charging/discharging the battery pack 100, or sends a stop signal to the external device 200 to stop the operation of the external device 200.
For a specific modification method of the modification module 400 in this embodiment, reference may be made to the detailed description in embodiment two.
Example two
The present embodiment provides a method for regulating and controlling charging and discharging of a battery pack 100, the battery pack 100 is connected to an external device 200, the battery pack 100 is discharged to the external device 200 or charged through the external device 200, and a temperature detection element 300 is disposed at a predetermined position of the battery pack 100. The external device 200 may be an electric tool, or may be a charger, when the external device 200 is an electric tool, the battery pack 100 charges the electric tool, the battery pack 100 discharges, and when the external device 200 is a charger, the charger supplies power to the battery pack 100, and the battery pack 100 charges. The temperature detecting element 300 may be disposed at a predetermined position of the battery pack 100 through the heat conductor 130, and for the specific arrangement manner of the temperature detecting element 300, reference may be made to the corresponding description in the first embodiment, which is not repeated herein.
Referring to fig. 8, the charge and discharge control method provided in this embodiment includes the following steps:
step S100, acquiring detection data of the temperature detection element 300;
s200, correcting the detection data to obtain corrected data;
and step S300, determining the temperature of the battery pack 100 according to the correction data, and regulating and controlling the charging and discharging process of the battery pack 100 according to the temperature of the battery pack 100.
In the above charge and discharge control method, the detection data of the temperature detection element 300 is not directly used as the temperature of the battery pack 100, but the detection data of the temperature detection element 300 is corrected to obtain the correction data, the temperature of the battery pack 100 is determined according to the correction data, and the charge and discharge process of the battery pack 100 is controlled according to the temperature of the battery pack 100. In practical applications, when the temperature of the battery pack 100 exceeds the safe temperature range, the charging and discharging of the battery pack 100 may be stopped. Due to the existence of the heat conductor 130, the detection data of the temperature detection element 300 has deviation from the actual temperature of the battery pack 100, and the actual temperature of the battery pack 100 can be obtained by correcting the monitoring data, so that the charging and discharging process of the battery pack 100 can be regulated and controlled in time according to the actual temperature of the battery pack 100, and the condition that the regulation and control error is caused because the actual temperature of the battery pack 100 cannot be detected is avoided.
In one embodiment, referring to fig. 9, in step S200, the step of correcting the detection data to obtain corrected data includes:
step S210, determining a first temperature variation parameter corresponding to the temperature detection element 300 according to the detection data.
In practical applications, a plurality of detection data of the temperature detection element 300 may be acquired, and the first temperature variation parameter of the temperature detection element 300 may be determined according to the acquired plurality of detection data. The first temperature change parameter is used to represent a change in the temperature data detected by the temperature detection element 300, and may be a temperature change slope, or may be another parameter capable of representing a change in the temperature data.
Step S220, determining a temperature variation parameter difference between the first temperature variation parameter and a second temperature variation parameter corresponding to the battery pack 100 according to the first temperature variation parameter and a preset mapping relationship, where the preset mapping relationship represents a corresponding relationship between the first temperature variation parameter and the temperature variation parameter difference.
According to actual tests, it is found that, in an initial state where charging and discharging are not performed, the temperature of the battery pack 100 coincides with the detected temperature of the temperature detection element 300, and when the battery pack 100 is subjected to constant-current discharge, the temperature of the battery pack 100 and the detected temperature of the temperature detection element 300 gradually increase, and due to the presence of the heat conductor 130, the deviation between the actual temperature of the battery pack 100 and the detected temperature of the temperature detection element 300 becomes larger and larger, that is, there is a difference between the first temperature variation parameter of the temperature detection element 300 and the second temperature variation parameter of the battery pack 100. The inventor creatively finds that the difference between the first temperature variation parameter and the second temperature variation parameter (referred to as the temperature variation parameter difference) and the first temperature variation parameter have a corresponding relationship, so that a preset mapping relationship between the first temperature variation parameter and the temperature variation parameter difference is firstly formed. In step S220, a temperature variation parameter difference is determined according to the determined first temperature variation parameter and a preset mapping relationship between the first temperature variation parameter and the temperature variation parameter difference.
In one embodiment, the first temperature variation parameter is a temperature variation slope of the temperature detection element 300, the second temperature variation parameter is a temperature variation slope of the battery pack 100, and the temperature variation parameter difference is a difference between the temperature variation slope of the battery pack 100 and the temperature variation slope of the temperature detection element 300.
Step S230, determining a temperature difference between the temperature of the battery pack 100 and the detection data of the temperature detection element 300 according to the temperature variation parameter difference and a preset relational expression, where the preset relational expression represents a corresponding relationship between the temperature variation parameter difference and the temperature difference.
When the temperature variation parameter difference is determined, the temperature difference between the temperature of the battery pack 100 and the detection data of the temperature detection element 300 can be calculated according to the preset relational expression between the temperature variation parameter difference and the temperature difference. The preset relational expression is formed in advance and used for representing the corresponding relation between the temperature change parameter difference value and the temperature difference value.
And S240, correcting the detection data according to the temperature difference.
Since the rising speed of the detection data often lags behind the actual temperature rising speed of the battery pack 100, that is, the detection data is lower than the actual temperature of the battery pack 100, in practical applications, after the temperature difference is determined, the obtained temperature difference can be increased on the basis of the detection data, and thus, the correction of the detection data can be realized.
In one embodiment, the step S100 of acquiring the detection data of the temperature detecting element 300 includes: a plurality of detection data of the temperature detecting element 300 are sampled according to a preset time interval. A time interval, for example, 20s or 30s or 35s, etc., may be preset, and the detection data is acquired once every time interval, i.e., sampling.
Step S210, namely, the step of determining the first temperature variation parameter corresponding to the temperature detection element 300 according to the detection data includes:
step S211, determining a first temperature variation parameter of the temperature detecting element 300 in a time interval according to the detection data of the temperature detecting element 300 sampled at the current sampling time and the last sampling time and the time interval.
For example, when the first temperature change parameter is a temperature change slope, the temperature change slope may be obtained by dividing a difference between detection data sampled at two adjacent sampling times by a preset time interval.
In addition to the above-described manner of acquiring a plurality of detection data at preset time intervals, the manner of acquiring the detection data when a preset reference temperature is reached may also be employed. For example, in another embodiment, before the step S210 of determining the first temperature variation parameter corresponding to the temperature detection element 300 according to the detection data, the charge and discharge control method provided in this embodiment further includes:
step S201, setting a plurality of reference temperatures.
A plurality of successively increasing reference temperature values may be provided, such as 25 deg.C, 45 deg.C, 50 deg.C, 55 deg.C, 60 deg.C, 65 deg.C, etc. The reference temperature is set in such a manner that, in the charging and discharging processes of the battery pack 100, whenever it is determined that the detection data of the temperature detection element 300 reaches the reference temperature, the current detection data is used as an input for subsequent calculation.
Step S203, when the detected data reaches any reference temperature, acquiring a time interval between a current sampling time and a previous sampling time, where the previous sampling time is a time when the detected data of the temperature detecting element 300 reaches a previous reference temperature.
At the initial time, the battery pack 100 does not start charging and discharging, and the initial time is assumed to be 25 ℃ as the first sampling time. Along with the charging and discharging processes of the battery pack 100, the temperature of the battery pack gradually rises, and when the detected data reaches 45 ℃, the second sampling time is reached, and the time interval between the current sampling time and the first sampling time is determined; when the detected data reaches 50 ℃, namely the third sampling moment is reached, the time interval between the current sampling moment and the second sampling moment is determined, and so on.
Step S210, determining a first temperature variation parameter corresponding to the temperature detection element 300 according to the detection data, includes:
step S213, determining a first temperature variation parameter of the temperature detecting element 300 in a time interval between the current reference temperature and the previous reference temperature and the time interval between the current sampling time and the previous sampling time.
For example, when the first temperature variation parameter is a temperature variation slope, the first temperature variation slope in the time interval may be determined by dividing the difference between the current reference temperature and the previous reference temperature by the time interval between the current sampling time and the previous sampling time. At each sampling instant, a first temperature variation parameter of the temperature detection element 300 in a corresponding time interval can be determined by the method.
In one embodiment, before the step S220 of determining the temperature variation parameter difference between the first temperature variation parameter and the second temperature variation parameter corresponding to the battery pack 100 according to the first temperature variation parameter and the preset mapping relationship, the charge and discharge control method provided in this embodiment further includes the following steps:
acquiring a discharge current of the battery pack 100; and determining a preset mapping relation between the first temperature change parameter and the temperature change parameter difference value according to the discharge current.
According to the measured data, when the discharge current of the battery pack 100 is different, the mapping relationship between the first temperature variation parameter and the temperature variation parameter difference is also different. That is, the current discharging current of the battery pack 100 may be obtained first, and the preset mapping relationship between the first temperature variation parameter and the temperature variation parameter difference is determined according to the discharging current.
In addition, the heat conduction power of the heat conductor 130 also affects the preset mapping relationship between the first temperature variation parameter and the temperature variation parameter difference.
The following table is a specific example of a mapping relationship among the heat conduction power of the heat conductor 130, the discharge current of the battery pack 100, the temperature change slope of the detection data, and the temperature change parameter difference:
Figure BDA0003187284510000191
kntc is the temperature change slope of the detection data, and Δ K is the temperature change parameter difference. Assuming that the discharge current of the battery pack 100 is 25A and the heat conduction power of the heat conductor 130 is 2W, when the temperature change slope of the acquired detection data is equal to or greater than 0.2085, it may be determined that the temperature change parameter difference Δ K is 0.0800, when the temperature change slope of the acquired detection data is 0.1569-0.2085, it may be determined that the temperature change parameter difference Δ K is 0.0391, when the temperature change slope of the acquired detection data is 0.1179-0.1569, it may be determined that the temperature change parameter difference Δ K is 0.0223, and so on, the temperature change parameter difference may be determined through the above mapping relationship, and further subsequent calculation may be performed.
In one embodiment, in step S230, that is, in the step of determining the temperature difference between the temperature of the battery pack 100 and the data detected by the temperature detecting element 300 according to the temperature variation parameter difference and the preset relation, the preset relation is:
ΔT n ＝(t n -t n-1 )*ΔK n +ΔT n-1
wherein, Δ T n Is a temperature difference between the temperature of the battery pack 100 and the data detected by the temperature detecting element 300 at the nth sampling timing, t n Is the nth sampling time, t n-1 Is the n-1 th sampling time, Δ K n At the nth sampling time, the temperature variation parameter difference, Δ T, between the battery pack 100 and the temperature detecting element 300 n-1 Is the temperature difference between the battery pack 100 and the temperature detection element 300 at the (n-1) th sampling timing.
According to the above formula, the temperature difference between the battery pack 100 and the temperature detection element 300 can be obtained quickly and accurately by combining the temperature variation parameter difference.
The derivation process of the preset relation is as follows:
assuming that the temperature change slope of the temperature of the battery pack 100 in the sampling time interval between the adjacent sampling times is fixed, the temperature change slope of the temperature detecting element 300 is also fixed, and the temperature detecting element 300 is a negative temperature coefficient NTC.
Tn: the actual temperature of the cell 120 at time n; tntcn: temperature detected by the temperature detecting element 300NTC at time n; kntc: the temperature change slope of the temperature detecting element 300NTC in the sampling time interval; k: sampling a temperature change slope of the battery pack 100 during a time interval; Δ K: the difference between the temperature change slope of the battery pack 100 and the temperature change slope of the NTC of the temperature sensing element 300, i.e., Δ K-Kntc, is sampled at intervals.
The temperature of the battery pack 100 is equal to the NTC temperature of the temperature detecting element 300 at the initial time. Assume an initial temperature of T0, T0 ═ Tntc0, Δ T 0 ＝0；
time t1, time t0-t1The temperature change slopes of the battery pack 100 and the temperature change slope of the NTC of the temperature detection element 300 in the interval are Kt1 and Kntct1, respectively, so that Tntct1 is Kntct 1T 1+ T0, Tt1 is Kt 1T 1+ T0, and Tt1 is Tntct1+ Δ T0 1 . Combining the three formulas to obtain:
Kt1*t1+T0＝Kntct1*t1+T0+ΔT 1 →ΔT 1 ＝t1*(Kt1-Kntct1)＝t1*ΔK 1
at time T2, the temperature change slope of the battery pack 100 and the temperature change slope of the NTC of the temperature detection element 300 are Kt2 and knct 2 respectively in the time interval T2-T1, then Tntct2 ═ knct 2 (T2-T1) + Tntc1, Tt2 ═ Kt2 ═ T2-T1) + Tt1, and Tt2 ═ tnct 2+ Δ T 2 . Combining the three formulas can obtain:
Kt2*(t2-t1)+Tt1＝Kntct2*(t2-t1)+Tntct1+ΔT 2 →ΔT 2 ＝(t2-t1)*(Kt2-Kntct2)+ΔT 1 ＝(t2-t1)*ΔK 2 +ΔT 1
from the above derivation, n times can be derived,
ΔT n ＝(t n -t n-1 )*(Kt n -Kntct n )+ΔT n-1 ＝(t n -t n-1 )*ΔK n +ΔT n-1
the following describes the charge and discharge control method provided in this embodiment with a specific example;
assuming that the predetermined time interval is 30 seconds, it can be known from the predetermined mapping relationship that Δ K is 0.06 when the temperature change slope Kntc of the NTC of the temperature detecting element 300NTC is greater than or equal to 0.15.
At time T0, T0 ═ Tntc0 ═ 25 ℃, Δ T 0 ＝0。
When the time T1 is the time after 30 seconds, the NTC temperature of the temperature detection element 300 is 30.0 ℃, the temperature change slope Kntct1 of the NTC of the temperature detection element 300 in the time of 30 seconds is calculated to be (30.0-25)/30 to be approximately equal to 0.17, and then delta K is 0.06, and delta T can be obtained according to the preset relational expression 1 ＝0.06*30+ΔT 0 ＝1.8℃。
The actual temperature Tt1 of the battery pack 100 is Tntct1+ Δ T 1 ＝30.0+1.8＝31.8℃。
When the NTC temperature of the temperature detection element 300 is 35.3 ℃ at time t2 after 30 seconds, the temperature change slope Kntct2 of the NTC of the temperature detection element 300 in 30 seconds is calculated to be (35.3-30.0)/30 ≈ 0.18,
ΔK＝0.06，ΔT 2 ＝0.06*30+ΔT 1 ＝3.6℃。
the actual temperature Tt2 of the battery pack 100 is Tntct2+ Δ T 2 ＝35.3+3.6＝38.9℃。
In one embodiment, the step S300 of determining the temperature of the battery pack 100 according to the correction data and controlling the charging and discharging processes of the battery pack 100 according to the temperature of the battery pack 100 includes:
step S310, determining whether the temperature of the battery pack 100 exceeds a preset range;
step S320, if the voltage exceeds the preset range, the external charging and discharging of the battery pack 100 is stopped.
The preset range is a safe temperature range of the battery pack 100, for example, when the actual temperature of the battery pack 100 is determined to exceed 75 ℃, the external charging and discharging of the battery pack 100 is stopped. If the actual temperature of the battery pack 100 is within the preset range, the current charging and discharging process of the battery pack 100 is continuously maintained.
All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (14)

1. The charging and discharging regulation and control device of the battery pack is characterized in that the battery pack is connected with external equipment, the battery pack is discharged to the external equipment or is charged through the external equipment, and the charging and discharging regulation and control device is used for regulating and controlling the charging and discharging process of the battery pack; the charge and discharge regulation and control device comprises:
the temperature detection element is arranged at a preset position of the battery pack through a heat conductor and is used for acquiring detection data;
the correction module is connected with the temperature detection element and is used for correcting the deviation of the detection data of the temperature detection element relative to the actual temperature data to obtain correction data, wherein the deviation comprises the deviation caused by the heat conductor;
and the control module is connected with the correction module and used for determining the temperature of the battery pack according to the correction data and regulating and controlling the charging and discharging process of the battery pack according to the temperature of the battery pack.
2. The battery pack charging and discharging regulation and control device according to claim 1, wherein the correction module comprises a correction element, the correction element is connected in series to a charging and discharging loop of the battery pack and the external device, one end of the correction element is grounded, and the other end of the correction element is connected to a negative electrode of the battery pack.
3. The device for regulating and controlling the charging and discharging of the battery pack according to claim 2, wherein the temperature detecting element comprises a thermistor, the correcting element comprises a linear resistor, the control module collects current values on a charging and discharging loop of the battery pack and the external equipment to obtain voltage at two ends of the correcting element, corrects the voltage at the first end of the thermistor according to the voltage at two ends of the correcting element, and determines the temperature of the battery pack according to the corrected voltage at the first end of the thermistor.
4. The battery pack charging and discharging control device according to claim 2 or 3, wherein the correction module and the control module are disposed in the external device.
5. The charging and discharging control device for the battery pack according to claim 1, wherein the correction module and the control module are disposed in the battery pack;
the correction module is used for: determining a first temperature change parameter corresponding to the temperature detection element according to the detection data of the temperature detection element; determining a temperature change parameter difference value of the first temperature change parameter and a second temperature change parameter corresponding to the battery pack according to the first temperature change parameter and a preset mapping relation; and determining the temperature difference between the battery pack and the detection data of the temperature detection element according to the temperature variation parameter difference and a preset relational expression, and correcting the detection data according to the temperature difference.
6. The device for regulating charging and discharging of the battery pack according to claim 1, wherein the battery pack comprises a casing, the casing comprises at least one battery cell, the preset position of the battery pack is any position of the surface of the battery cell or the casing, and the temperature of the battery pack comprises the temperature of the battery cell or the temperature of the casing.
7. A battery pack charging and discharging regulation method is characterized in that a battery pack is connected with an external device, the battery pack is discharged to the external device or charged through the external device, a temperature detection element is arranged at a preset position of the battery pack, and the temperature detection element is arranged at the preset position of the battery pack through a heat conductor; the charge and discharge regulation method comprises the following steps:
acquiring detection data of the temperature detection element;
correcting the deviation of the detection data relative to the actual temperature data to obtain corrected data, wherein the deviation comprises the deviation caused by the heat conductor;
and determining the temperature of the battery pack according to the correction data, and regulating and controlling the charging and discharging process of the battery pack according to the temperature of the battery pack.
8. The charge and discharge control method according to claim 7, wherein the step of correcting the detection data to obtain correction data includes:
determining a first temperature change parameter corresponding to the temperature detection element according to the detection data;
determining a temperature change parameter difference value of a first temperature change parameter and a second temperature change parameter corresponding to the battery pack according to the first temperature change parameter and a preset mapping relation, wherein the preset mapping relation represents a corresponding relation between the first temperature change parameter and the temperature change parameter difference value;
determining a temperature difference value between the temperature of the battery pack and the detection data of the temperature detection element according to the temperature variation parameter difference value and a preset relational expression, wherein the preset relational expression represents a corresponding relation between the temperature variation parameter difference value and the temperature difference value;
and correcting the detection data according to the temperature difference.
9. The charge and discharge control method according to claim 8, wherein the step of acquiring the detection data of the temperature detection element includes:
sampling a plurality of detection data of the temperature detection element according to a preset time interval;
the step of determining a first temperature variation parameter corresponding to the temperature detection element according to the detection data comprises:
and determining a first temperature change parameter of the temperature detection element in a time interval according to the detection data of the temperature detection element sampled at the current sampling moment and the last sampling moment and the time interval.
10. The charge and discharge regulation and control method according to claim 8, wherein before the step of determining the first temperature change parameter corresponding to the temperature detection element according to the detection data, the charge and discharge regulation and control method comprises:
setting a plurality of reference temperatures;
when the detection data reaches any one reference temperature, acquiring a time interval between the current sampling moment and the last sampling moment, wherein the last sampling moment is the moment when the detection data of the temperature detection element reaches the last reference temperature;
the step of determining a first temperature variation parameter corresponding to the temperature detection element according to the detection data comprises:
and determining a first temperature change parameter of the temperature detection element in the time interval according to the current reference temperature, the last reference temperature and the time interval between the current sampling time and the last sampling time.
11. The charge and discharge control method according to claim 9 or 10, wherein before the step of determining the temperature change parameter difference between the first temperature change parameter and the second temperature change parameter corresponding to the battery pack according to the first temperature change parameter and a preset mapping relationship, the method further comprises:
acquiring the discharge current of the battery pack;
and determining a preset mapping relation between the first temperature change parameter and the temperature change parameter difference value according to the discharge current.
12. The charge and discharge control method according to claim 9 or 10, wherein in the step of determining the temperature difference between the temperature of the battery pack and the detection data of the temperature detection element according to the temperature change parameter difference and a preset relational expression, the preset relational expression is:
ΔT n ＝(t n -t n-1 )*ΔK n +ΔT n-1
wherein, Delta T n Is the temperature difference between the temperature of the battery pack and the detection data of the temperature detection element at the nth sampling time, t n Is the nth sampling time, t n-1 Is the n-1 th sampling time, Δ K n At the nth sampling time, the battery pack and the temperature detectorTemperature variation parameter difference, delta T, of the measuring element n-1 Is the temperature difference between the battery pack and the temperature detection element at the (n-1) th sampling time.
13. The charge and discharge control method according to claim 12, wherein the first temperature variation parameter is a temperature variation slope of the temperature detection element, and the second temperature variation parameter is a temperature variation slope of the battery pack.
14. The charge and discharge control method according to claim 8, wherein the step of determining the temperature of the battery pack according to the correction data and controlling the charge and discharge process of the battery pack according to the temperature of the battery pack includes:
judging whether the temperature of the battery pack exceeds a preset range or not;
and if the current exceeds the preset range, stopping the external charging and discharging of the battery pack.
CN202110867689.8A 2021-03-04 2021-03-04 Charging and discharging regulation and control device and method for battery pack Pending CN115021337A (en)

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