CN111653719B - High-energy-density battery pack, multi-cell switching test device and test method - Google Patents
High-energy-density battery pack, multi-cell switching test device and test method Download PDFInfo
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- CN111653719B CN111653719B CN202010453644.1A CN202010453644A CN111653719B CN 111653719 B CN111653719 B CN 111653719B CN 202010453644 A CN202010453644 A CN 202010453644A CN 111653719 B CN111653719 B CN 111653719B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- 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
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- 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
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- 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
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- 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
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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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00302—Overcharge protection
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00304—Overcurrent protection
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00306—Overdischarge protection
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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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
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- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
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- 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)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a high-energy-density battery pack, which realizes the function of performing series-parallel connection combination on single battery cells by shaping and connecting electrodes of the battery cells; meanwhile, the functions of charge and discharge protection, short-circuit protection and equalization of the battery cells are realized through the set voltage, current and temperature monitoring and protecting circuits; the invention provides a multi-cell switching test device and a test method, which can perform serial-parallel combined switching on single cells in a test state and monitor voltage, current and temperature information; the invention reduces the production cost through the modularized battery cell and improves the research and development, test and maintenance efficiency of the battery cell and the battery pack.
Description
Technical Field
The invention belongs to the technical field of batteries, and particularly relates to a high-energy-density battery pack, a multi-cell switching test device and a test method.
Background
Along with the rapid development of electronic technology, the electronic products have smaller and smaller requirements on volume and longer requirements on service time, and a battery with high energy density is needed to provide power, while the traditional power of the electronic products is mostly nickel-hydrogen batteries, so that the battery has low voltage platform, memory effect, capacity of not supplementing electricity at any time and large self-discharge rate; the lithium ion storage battery has high energy density, good safety and no memory effect, and can be widely used for supplementing electric quantity at any time. However, the lithium ion battery needs to be combined in series-parallel connection in the use process, and the problems of unbalance, overcharge, overdischarge and the like among the single batteries generally exist in the long-term use process of the lithium ion battery, so that the service life of the lithium ion battery pack is influenced, and even potential safety hazards are generated.
Disclosure of Invention
The invention aims to solve the technical problems that: providing a high-energy-density battery pack, realizing serial-parallel combination of single battery cells, and simultaneously performing charge-discharge protection and equalization on the battery cells; the multi-cell switching test device and the test method are provided, so that the single cells can be conveniently switched in series-parallel connection under the test state, and meanwhile, the voltage, current and temperature information can be monitored.
The technical scheme adopted by the invention for solving the technical problems is as follows: a high energy density battery pack comprises a shell, an electric core, an electrode shaping plate and an electrode connecting plate; the battery cell is laminated and fixed in the shell, and the electrode shaping plate and the electrode connecting plate are parallel and fixed on one side of the electrode, close to the battery cell, in the shell; the shape and position of the exposed electrode are fixed by the cell through the electrode shaping plate, and the electrodes of the shaped cell are connected in series or in parallel or in series-parallel mixture through the electrode connecting plate.
According to the scheme, the portable electronic device further comprises an upper cover, the shell is provided with an upper opening, and the upper cover is assembled on the upper opening of the shell.
According to the scheme, the protective circuit board is fixed inside the shell; the protection circuit board comprises a charging protection module, a discharging protection module and a short-circuit protection circuit, the charging protection module is connected in series between the charger and the battery core, the charging protection module comprises an overcharge protection circuit and a charging overcurrent protection circuit, the overcharge protection circuit is used for switching off the charging circuit when the charging voltage of the battery core reaches full charge voltage, and the charging overcurrent protection circuit is used for switching off the charging circuit when the charging current reaches a preset value; the discharging protection module is connected in series between the battery core and the load, and comprises an over-discharging protection circuit and a discharging over-current protection circuit, wherein the over-discharging protection circuit is used for switching off the discharging circuit when the discharging voltage of the battery core reaches the minimum voltage, and the discharging over-current protection circuit is used for switching off the discharging circuit when the discharging current reaches a preset value; the short-circuit protection circuit is respectively connected in series between the charger and the battery core and between the battery core and the load, and is used for disconnecting the charging circuit or the discharging circuit when the charging circuit or the discharging circuit is short-circuited.
Further, the protection circuit board also comprises cell balancing circuits which are not less than the number of the cells; when the electric cores are connected in series, each electric core equalizing circuit is connected in parallel between the positive electrode and the negative electrode of the electrode of each electric core, and is used for making the charging voltage or the discharging voltage of the electric cores connected in series consistent.
Further, the protection circuit board also comprises an electric quantity management module, wherein the electric quantity management module is used for calculating the residual electric quantity by monitoring the output voltage, the output current and the surface temperature of the battery cell and outputting voltage information, current information, temperature information and electric quantity information; the electric quantity management module comprises a controller, a voltmeter, an ammeter, a temperature sensor, a memory and a communication interface, wherein signal output ends of the voltmeter, the ammeter and the temperature sensor are connected with signal input ends of the controller, and signal receiving and transmitting ends of the controller are respectively connected with signal receiving and transmitting ends of the memory and signal receiving and transmitting ends of the communication interface.
Further, the battery pack also comprises a panel fixed on the shell, wherein the panel comprises a display for displaying voltage information, current information, temperature information and electric quantity information of the battery cell; the signal input end of the display is connected with the signal output end of the controller.
According to the scheme, the battery cell protection device further comprises insulating sheets, wherein the insulating sheets are respectively arranged between the battery cell and the protection circuit board and between the electrode connecting plate and the panel, and the insulating sheets are used for preventing short circuit phenomena from occurring between the battery cell and the protection circuit board and between the electrode connecting plate and the panel.
A multi-cell switching test device comprising the high energy density battery pack of any one of claims 1 to 7 with cells removed; the side of the shell, which is far away from the electrode of the battery core, is provided with a rear opening.
Further, the panel also comprises an electrode connection button for switching the battery cell to be tested and a test button for starting or stopping the test; the switching contact of the electrode connecting button is fixedly connected with the series electrode connecting strip and the parallel electrode connecting strip of the electrode connecting plate respectively; the test button is connected in series in the charging loop or the discharging loop of the battery cell.
A testing method of a multi-cell switching testing device comprises the following steps:
step S1: inserting the battery core to be tested into the shell from the rear opening of the shell of the multi-battery-core switching testing device, and fixing the electrode of the battery core on the electrode shaping plate of the multi-battery-core switching testing device;
step S2: the electrode connection buttons on the switching panel enable the electrodes of the battery core to be connected in series or in parallel or in series-parallel mixed connection through the electrode connection plates;
step S3: pressing a test button on the panel to start a cell test including a voltage test, a current test and an electrical burn-in test;
step S4: the protection circuit board of the multi-cell switching test device calculates the residual electric quantity of the cell by detecting the output voltage, the output current and the surface temperature of the cell, and sends and displays the voltage information, the current information, the temperature information and the electric quantity information of the cell on a display screen of a panel, and simultaneously sends the information to an upper computer through a communication interface;
step S5: the protection circuit board performs reverse connection protection, short circuit protection, overcharge protection, overdischarge protection, overcurrent protection, overtemperature protection and battery cell equalization on the battery cell by monitoring the output voltage, the output current and the surface temperature of the battery cell in the test process of the battery cell;
step S6: switching electrode connection buttons on the panel or changing the electrode shaping plate to change the connection mode of the electrodes of the battery core, and starting circulation from the step S3 until all the tests are completed;
step S7: and (5) the test button is sprung to stop the test, and the battery cell is pulled out.
The beneficial effects of the invention are as follows:
1. according to the high-energy-density battery pack, the electrode of the battery core is shaped, so that the function of serial-parallel combination of single battery cores is realized, and the battery pack has high space utilization rate, high energy density, small volume and light weight; meanwhile, the functions of charge and discharge protection and equalization of the battery cells are realized through the set voltage, current and temperature monitoring and protecting circuits.
2. The multi-cell switching test device and the test method can perform serial-parallel combined switching on the single cells under a test state, and monitor voltage, current and temperature information.
3. The invention can design the size of the modularized battery core according to the use requirement, reduces the production cost through the modularized battery core, and improves the research and development, test and maintenance efficiency of the battery core and the battery pack.
Drawings
Fig. 1 is a perspective assembly view of an embodiment of the present invention.
Fig. 2 is an outline view of an embodiment of the present invention.
Fig. 3 is a functional block diagram of an embodiment of the present invention.
Fig. 4 is a protection circuit diagram of an embodiment of the present invention.
Fig. 5 is a schematic diagram of a cell balancing circuit according to an embodiment of the present invention.
Fig. 6 is a circuit diagram of power management according to an embodiment of the present invention.
In the figure: 1. an upper cover; 2. a housing; 3. a battery cell; 4. a protective circuit board; 5. a first insulating sheet; 6. an electrode shaping plate; 7. a second insulating sheet; 8. an electrode connection plate; 9. a panel.
Detailed Description
The invention will be described in further detail with reference to the drawings and the detailed description.
Referring to fig. 1 and 2, a high energy density battery pack according to an embodiment of the present invention includes an upper cover 1, a case 2, four battery cells 3, a protective circuit board 4, a first insulating sheet 5, an electrode shaping plate 6, a second insulating sheet 7, an electrode connecting plate 8, and a panel 9.
The shell 2 is provided with an upper opening, the upper cover 1 is assembled on the upper opening of the shell 2, and the upper cover 1 and the shell 2 are formed by injection molding of ABS+PC or PP materials, so that the surface of the battery pack is smooth, scratch-resistant, and the strength of the battery is enhanced. The insides of the upper cover 1 and the shell 2 are sequentially sprayed with conductive paint and three-proofing paint; the conductive paint is used for shielding electromagnetic waves, so that the battery pack is prevented from generating electromagnetic interference to external electric equipment in the use process, and meanwhile, the battery pack is prevented from being interfered by the electromagnetic waves generated by the work of the external electric equipment; the three-proofing paint insulates and protects various circuits and components in the battery pack, and prevents the circuits and components from contacting the conductive paint to cause short circuit danger; the upper cover 1 and the shell 2 are welded by ultrasonic waves, so that the device is convenient and reliable.
The four battery cores 3 are all lithium ion battery cores, and the lithium ion storage battery has high energy density, small volume, light weight and good safety, and can be repeatedly charged and discharged for use; the four battery cells 3 are fixedly stacked in the shell 2, and the battery cells 3 are fixedly glued by double-sided adhesive; the electrode shaping plate 6 and the electrode connecting plate 8 are parallel and fixed at one side of the electrode, which is close to the battery cell 3, inside the shell 2, and the electrode shaping plate 6 is made of insulating materials; the four electric cores 3 are respectively fixed with the shape and the position of the exposed electrode through the electrode shaping plate 6, and the electrodes of the shaped electric cores 3 are respectively spot-welded on the serial electrode connecting strips of the electrode connecting plate 8, so that the four electric cores 3 are connected in series; if the serial-parallel connection mode of the battery core 3 needs to be changed, only the electrode shaping plate 6 and the electrode connecting plate 8 need to be changed, the shape and the position of the exposed electrode are changed through the new electrode shaping plate 6, and the electrode connecting strips which are connected in series and in parallel with the electrode connecting plate 8 are welded in a spot mode. According to the electrode connection mode of the battery core 3, the single lithium ion battery core can be soft-packed storage batteries with different positive electrode systems, and the number of the series or parallel connection battery packs is adjusted according to the electrical performance requirements of electric equipment; and according to the magnitude of the current used, a power type or energy type soft package storage battery is selected to form a battery pack with high energy density, high discharge multiplying power and long service life.
The protection circuit board 4 is fixed above the battery cell 3 inside the housing. The panel 9 is fixed on the casing 2 and parallel to the electrode connection plate 8, and the panel 9 can be used for fixing a display for displaying voltage information, current information, temperature information and electric quantity information of the battery cell 3. The first insulating sheet 5 is arranged between the battery core 3 and the protective circuit board 4, and the second insulating sheet 7 is arranged between the electrode connecting plate 8 and the panel 9; the first insulating sheet 5 can effectively prevent the components or pin burrs on the protection circuit board 4 from puncturing the aluminum-plastic film on the surface of the soft package storage battery, so that the battery pack is prevented from leaking or short-circuited; the second insulating sheet 7 is made of flexible insulating material, and is used for preventing the surface insulating layer of the electrode connecting plate 8 from being damaged due to extrusion vibration in the use process, so that faults such as short circuit and the like occur between the electrode connecting plate 8 and the panel 9.
Referring to fig. 3, the protection circuit board 4 includes a charge protection module, a discharge protection module, a short circuit protection circuit, a cell balancing circuit, and an electric quantity management module; the charging protection module is connected in series between the charger and the battery cell 3 and comprises an overcharge protection circuit and a charging overcurrent protection circuit; the discharge protection module is connected in series between the battery core 3 and the load and comprises an over-discharge protection circuit and a discharge over-current protection circuit; the short-circuit protection circuit is respectively connected in series between the charger and the battery cell 3 and between the battery cell 3 and the load.
Referring to fig. 4, the invention adopts a lithium ion battery charge-discharge protection chip S-8254AA to perform charge-discharge protection on four series-connected battery cells 3, and fig. 4 is a typical circuit of the S-8254AA chip for protecting the four series-connected battery cells 3, including a charge protection function, a discharge protection function, an overcurrent protection function and a short circuit protection function; the overcharge protection function is to disconnect the charging circuit when the charging voltage of the battery core 3 reaches the full charge voltage, and the charge overcurrent protection function is to shunt when the charging current reaches a preset value; the over-discharge protection function is to disconnect the discharge circuit when the discharge voltage of the battery cell reaches the minimum voltage, and the over-discharge protection circuit is to shunt when the discharge current reaches a preset value; the short-circuit protection circuit is used for opening the charging circuit or the discharging circuit when the charging circuit or the discharging circuit is short-circuited.
Referring to fig. 5, the cell balancing circuit includes four repeated balancing units, each corresponding to one cell 3, and each balancing unit employs a balancing chip S-8241; in this embodiment, four battery cells 3 are connected in series, and each equalization unit is respectively connected in parallel between the positive electrode and the negative electrode of each battery cell 3, so as to make the charging voltage or the discharging voltage, that is, the electrical performance, of the battery cells 3 connected in series consistent, and prevent the battery pack connected in series from being damaged in the charging and discharging processes.
Referring to fig. 6, the power management module is used for calculating the remaining power by monitoring the output voltage, output current and surface temperature of the battery cell, and outputting voltage information, current information, temperature information and power information to the displays of the upper computer and the panel 9. The electric quantity management module adopts an electric quantity meter DS2788, wherein the electric quantity meter DS2788 comprises a controller, a voltmeter, an ammeter, a temperature sensor, an EEPROM memory, an LED display and a 1-Wire communication interface; the signal output ends of the voltmeter, the ammeter and the temperature sensor are connected with the signal input end of the controller, and the sampling cable of the voltmeter is welded on the electrode connecting strip of the electrode connecting plate 8 by nickel strips and corresponds to the positive electrode of each cell 3 respectively, so that the space occupied by connecting wires is reduced, the direct operation of the electrodes of the cells 3 is also reduced, and the service life of the electrodes is prolonged; the signal receiving and transmitting end of the controller is respectively connected with the signal receiving and transmitting end of the memory and the signal receiving and transmitting end of the communication interface, and the signal transmitting end of the controller is connected with the signal receiving end of the LED display; the LED display is fixed on the panel 9, displaying the remaining power in milliampere-hours and percentage of full capacity; the electric quantity management module enables the battery pack to be in a monitored state all the time in the use process, and can guarantee the use safety of the battery pack to the greatest extent. In addition, LDO chip TLV70433DBVR is adopted to convert the output voltage of the battery cell into 3.3V to supply power for fuel gauge DS 2788.
A multi-cell switching test device is composed of a high-energy-density battery pack with a cell 3 removed; a rear opening is formed in one side of the shell 2, which is far away from the electrode of the battery cell 3; meanwhile, an electrode connection button for switching the battery cell 3 to be tested and a test button for starting or stopping the test are additionally arranged on the panel 9; the switching contact of the electrode connecting button is fixedly connected with the series electrode connecting strip and the parallel electrode connecting strip of the electrode connecting plate 8 respectively; the test button is connected in series in the charging circuit or the discharging circuit of the battery cell 3.
A testing method of a multi-cell switching testing device comprises the following steps:
step S1: inserting the battery cell 3 to be tested into the shell 2 from the rear opening of the shell 2 of the multi-battery-cell switching testing device, and fixing the electrode of the battery cell 3 on the electrode shaping plate 6 of the multi-battery-cell switching testing device;
step S2: the electrode connection buttons on the switching panel 9 enable the electrodes of the battery core 3 to be connected in series or in parallel or in series-parallel mixed connection through the electrode connection plate 8;
step S3: pressing a test button on panel 9 starts a cell test including a voltage test, a current test, and an electrical burn-in test;
step S4: the protection circuit board 4 of the multi-cell switching test device calculates the residual electric quantity of the cell 3 by detecting the output voltage, the output current and the cell surface temperature of the cell 3, and sends and displays the voltage information, the current information, the temperature information and the electric quantity information of the cell 3 on a display screen of the panel 9, and simultaneously sends the information to an upper computer through a communication interface;
step S5: the protection circuit board 4 performs reverse connection protection, short circuit protection, overcharge protection, overdischarge protection, overcurrent protection, overtemperature protection, undertemperature protection and cell equalization on the cell 3 by monitoring the output voltage, the output current and the cell surface temperature of the cell 3 in the test process of the cell 3;
step S6: switching electrode connection buttons on the panel 9 or changing the electrode shaping plate 6 to change the connection mode of the electrodes of the battery cell 3, and starting circulation from the step S3 until all the tests are completed;
step S7: the test button is sprung up to stop the test, and the battery cell 3 is pulled out.
The above embodiments are merely for illustrating the design concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, the scope of the present invention is not limited to the above embodiments. Therefore, all equivalent changes or modifications according to the principles and design ideas of the present invention are within the scope of the present invention.
Claims (3)
1. A multi-cell switching testing device is characterized in that: comprises a shell, an electrode shaping plate and an electrode connecting plate; the inside of the shell comprises a space for installing the battery cell, and the electrode shaping plate and the electrode connecting plate are parallel and fixed at one side of the electrode, which is close to the battery cell, inside the shell; the electrode shaping plate is used for fixing the battery core and exposing the shape and position of the electrode, and the electrodes of the shaped battery core are connected in series or in parallel or in series-parallel mixed connection through the electrode connecting plate;
the upper cover is assembled on the upper opening of the shell;
the protective circuit board is fixed inside the shell; the protection circuit board comprises a charging protection module, a discharging protection module and a short-circuit protection circuit, the charging protection module is connected in series between the charger and the battery core, the charging protection module comprises an overcharge protection circuit and a charging overcurrent protection circuit, the overcharge protection circuit is used for switching off the charging circuit when the charging voltage of the battery core reaches full charge voltage, and the charging overcurrent protection circuit is used for switching off the charging circuit when the charging current reaches a preset value; the discharging protection module is connected in series between the battery core and the load, and comprises an over-discharging protection circuit and a discharging over-current protection circuit, wherein the over-discharging protection circuit is used for switching off the discharging circuit when the discharging voltage of the battery core reaches the minimum voltage, and the discharging over-current protection circuit is used for switching off the discharging circuit when the discharging current reaches a preset value; the short-circuit protection circuit is respectively connected in series between the charger and the battery cell and between the battery cell and the load, and is used for disconnecting the charging circuit or the discharging circuit when the charging circuit or the discharging circuit is short-circuited;
the protection circuit board also comprises cell equalization circuits with the number not less than that of the cells; when the electric cores are connected in series, each electric core equalizing circuit is connected in parallel between the positive electrode and the negative electrode of the electrode of each electric core and is used for enabling the charging voltage or the discharging voltage of the electric cores connected in series to be consistent;
the protection circuit board also comprises an electric quantity management module, wherein the electric quantity management module is used for calculating the residual electric quantity by monitoring the output voltage, the output current and the surface temperature of the battery cell and outputting voltage information, current information, temperature information and electric quantity information; the electric quantity management module comprises a controller, a voltmeter, an ammeter, a temperature sensor, a memory and a communication interface, wherein signal output ends of the voltmeter, the ammeter and the temperature sensor are connected with a signal input end of the controller, and a signal receiving and transmitting end of the controller is respectively connected with a signal receiving and transmitting end of the memory and a signal receiving and transmitting end of the communication interface;
the panel is fixed on the shell and comprises a display for displaying voltage information, current information, temperature information and electric quantity information of the battery cell; the signal input end of the display is connected with the signal output end of the controller;
the insulation sheets are respectively arranged between the battery core and the protection circuit board and between the electrode connecting plate and the panel, and are used for preventing short circuit phenomena from occurring between the battery core and the protection circuit board and between the electrode connecting plate and the panel;
a rear opening is formed in one side of the shell, which is far away from the electrode of the battery cell;
the panel also comprises an electrode connection button for switching the battery cell to be tested and a test button for starting or stopping the test; the switching contact of the electrode connecting button is fixedly connected with the series electrode connecting strip and the parallel electrode connecting strip of the electrode connecting plate respectively; the test button is connected in series in the charging loop or the discharging loop of the battery cell.
2. The testing method based on the multi-cell switching testing device of claim 1, wherein the testing method comprises the following steps: the method comprises the following steps:
step S1: inserting the battery core to be tested into the shell from the rear opening of the shell of the multi-battery-core switching testing device, and fixing the electrode of the battery core on the electrode shaping plate of the multi-battery-core switching testing device;
step S2: the electrode connection buttons on the switching panel enable the electrodes of the battery core to be connected in series or in parallel or in series-parallel mixed connection through the electrode connection plates;
step S3: pressing a test button on the panel to start a cell test including a voltage test, a current test and an electrical burn-in test;
step S4: the protection circuit board of the multi-cell switching test device calculates the residual electric quantity of the cell by detecting the output voltage, the output current and the surface temperature of the cell, and sends and displays the voltage information, the current information, the temperature information and the electric quantity information of the cell on a display screen of a panel, and simultaneously sends the information to an upper computer through a communication interface;
step S5: the protection circuit board performs reverse connection protection, short circuit protection, overcharge protection, overdischarge protection, overcurrent protection, overtemperature protection and battery cell equalization on the battery cell by monitoring the output voltage, the output current and the surface temperature of the battery cell in the test process of the battery cell;
step S6: switching electrode connection buttons on the panel or changing the electrode shaping plate to change the connection mode of the electrodes of the battery core, and starting circulation from the step S3 until all the tests are completed;
step S7: and (5) the test button is sprung to stop the test, and the battery cell is pulled out.
3. A high energy density battery pack based on the multi-cell switching test device of claim 1, wherein: comprises an electric core; the battery cell is stacked and fixed inside the shell.
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