CN113933726A - Lithium power battery formation and capacity grading series connection detection system - Google Patents
Lithium power battery formation and capacity grading series connection detection system Download PDFInfo
- Publication number
- CN113933726A CN113933726A CN202111056951.7A CN202111056951A CN113933726A CN 113933726 A CN113933726 A CN 113933726A CN 202111056951 A CN202111056951 A CN 202111056951A CN 113933726 A CN113933726 A CN 113933726A
- Authority
- CN
- China
- Prior art keywords
- battery
- module
- series
- switch
- main circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
- G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
- G01R1/0425—Test clips, e.g. for IC's
-
- 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]
- G01R31/3644—Constructional arrangements
-
- 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]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
-
- 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
-
- 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
Abstract
The invention discloses a serial detection system for lithium power battery formation and capacity division, wherein the detection system comprises a battery serial main circuit, a bidirectional power module, a power supply, a press machine, a control system and a monitoring center, wherein the battery serial main circuit comprises a plurality of batteries and a switch control module for serially connecting the batteries, the bidirectional power module comprises at least one AC-DC module and at least one DC-DC module, the press machine comprises a pressing mechanism and a probe or a clamp, the bidirectional power module of the embodiment of the invention provides different powers by adopting different combination modes of the AC-DC module and the DC-DC module, the serial connection of the batteries is realized through the battery serial main circuit, and the serial charging and discharging functions of the batteries are realized through the cooperative control of the bidirectional power module, the battery serial main circuit, the power supply and the press machine, and the online exit of a single battery is realized, the process requirements of formation or capacity grading of the lithium power battery are met, and particularly, the requirements can be met when the voltage discharge voltage of the single battery is low.
Description
Technical Field
The invention relates to the technical field of lithium ion secondary battery formation and partial capacity detection, in particular to a lithium power battery formation and partial capacity series detection system.
Background
The production process of the lithium ion secondary battery is various, and formation and capacity grading are the most critical processes in the post-treatment link of the battery in the post-treatment link after liquid injection, and detection equipment is required for charging and discharging. Activating the battery through a formation process; and carrying out capacity sorting and performance screening and grading through a capacity grading process. The traditional formation and capacity grading detection system uses a parallel technical scheme, namely, each battery is formed and subjected to capacity grading by adopting an independent charging and discharging power supply, and the scheme is difficult to greatly improve and break through the performance aspects such as energy efficiency, precision and the like.
The lithium power battery series connection detection technology is a new technology, and can obviously improve the consistency of battery series connection charging and discharging due to efficiency improvement. With the increase of the capacity of the lithium battery, the battery core gradually develops from several ampere hours and dozens of ampere hours to several hundred ampere hours, and the system capacity of the series battery is larger and larger; in addition, some process requirements are higher and higher, such as a single cell discharges to a very low voltage (below 1V, even to 0V), and in order to meet the new requirements, a completely new topological structure must be invented. For example, a multi-power module parallel mode is adopted, and a power supply module is added.
Disclosure of Invention
The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.
The embodiment of the invention provides a lithium power battery formation and capacity grading series connection detection system, which comprises:
the bidirectional power module comprises at least one AC-DC module and at least one DC-DC module, different powers are provided by the bidirectional power module through different combination modes of the AC-DC module and the DC-DC module, and the bidirectional power module and different numbers of batteries form a series circuit to realize charging and discharging of the batteries
The battery series main circuit is connected with the bidirectional power module and the power supplementing power supply and comprises a plurality of switch control modules and a plurality of batteries which are connected in series, and each switch control module is used for controlling the connection or online exit of a single battery;
the electricity supplementing power supply is connected with the battery series main circuit in series and used for improving the voltage of the battery series main circuit and realizing continuous charging and discharging under the condition that only one battery remains in the battery series main circuit until the cut-off voltage of a formation or capacity grading process is met;
the pressing machine comprises a probe or a clamp, the probe or the clamp is connected with the switch control module through a cable, the pressing mechanism is used for realizing the contact between the anode and the cathode of the battery and the probe or the clamp through electrical control, so that the battery is connected to the switch control module;
the control system is an information acquisition, control and interaction pivot, and controls the pressing mechanism to connect the battery with the probe or the clamp, serially connect the battery into the battery series main circuit through the switch control module, control the bidirectional power module to charge and discharge the battery on the battery series main circuit, acquire battery data in real time and control the online exit of the battery and/or execute the safety control operation of the formation and grading process flow in the process of executing the formation and grading process flow;
and the monitoring center is used for issuing an execution instruction of the formation and capacity grading technological process, monitoring the running condition of the capacity grading technological process according to the battery data, and storing, counting and analyzing the battery data.
The detection system for the battery serial component capacity provided by the embodiment of the invention at least has the following beneficial effects: the embodiment of the invention provides different powers through different combination modes of the AC-DC module and the DC-DC module in the bidirectional power module, and meets different current requirements when different numbers of batteries are subjected to series formation or capacity grading processes, thereby being suitable for the flexible and changeable detection requirements of the batteries; in addition, the embodiment of the invention also provides an electricity supplementing power supply which is connected in series with the battery series main circuit, so that the voltage of the battery series main circuit can be increased, and the purpose that the charging and discharging can be continued under the condition that only one battery remains in the battery series main circuit is realized until the cut-off voltage of the formation or grading process is met.
In some embodiments, the AC-DC module includes a first input terminal and a first output terminal, the DC-DC module includes a second input terminal and a second output terminal, the first input terminal is connected to an AC power grid, the first output terminal is connected to the second input terminal, and the second output terminal is connected to the battery series main circuit.
In some embodiments, the AC-DC includes two modes, one is a power frequency transformer isolated AC-DC, and the other is a high frequency transformer isolated AC-DC, the number of the AC-DC modules is two or more, the AC-DC modules are connected in parallel, the control system performs current sharing control on the AC-DC modules, the number of the DC-DC modules is two or more, the DC-DC modules are connected in parallel, and the control system performs current sharing control on the DC-DC modules.
In some embodiments, the probes include a current probe and a voltage probe, the clamps include a current clamp and a voltage clamp, and the press system is configured to contact the positive and negative electrodes of the battery on the battery tray with the current probe or the current clamp, the voltage probe or the voltage clamp respectively after being pressed.
In some embodiments, the switch control module includes a direct switch module and a bypass switch module, the direct switch module is connected in series with the battery, the bypass switch module is connected in parallel to a branch formed by the direct switch module and the battery, and each switch control module independently controls each battery to be connected in series with the battery series main circuit or to be disconnected from the battery series main circuit.
In some embodiments, the direct switch module and the bypass switch module are combined by a plurality of electronic switch tubes according to a battery series structure and charge-discharge requirements, and the direct switch module and the bypass switch module are controlled in an interlocking manner to realize functions of preventing the battery from being placed reversely and the battery from exiting online.
In some embodiments, the direct switch module and the bypass switch module include electrically controlled switches coupled in parallel with diodes.
In some embodiments, the power supply is a bidirectional dc power supply with rectification and inversion capabilities, and the detection system includes at least one of the power supply to increase the dc side voltage of the bidirectional power module.
In some embodiments, the control system further includes an acquisition module, the acquisition module includes a voltage detection module for detecting a battery voltage, a current detection module for detecting a battery current, and a temperature detection module for detecting a battery temperature, the control system is further configured to receive the execution instruction issued by the monitoring center and upload the battery data to the monitoring center, and the battery data includes the battery voltage, the battery current, and the battery temperature.
In some embodiments, the press machine is configured to control the probe or the clamp to contact or separate from the battery according to the execution instruction issued by the monitoring center.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
FIG. 1 is a schematic diagram of the structural connection of a detection system provided in one embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of the connection of the bypass switch and the direct switch to the battery according to one embodiment of the present invention;
3-5 are three circuit diagrams of a switch module provided by one embodiment of the present invention;
fig. 6-9 are block connection diagrams of bi-directional power modules provided by one embodiment of the present invention;
fig. 10-12 are connection diagrams of bi-directional power modules and library bit configurations according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the following description, suffixes such as "module", "part", or "unit" used to denote elements are used only for facilitating the explanation of the present invention, and have no peculiar meaning in itself. Thus, "module", "component" or "unit" may be used mixedly.
It should be noted that the terms first, second and the like in the description and in the claims, and in the drawings described above, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
At present, formation and grading equipment for lithium power batteries (lithium secondary batteries) generally adopts a battery parallel connection mode to carry out formation or grading process, each channel corresponds to one battery to carry out charging and discharging, and N power lines from a power supply to the batteries are needed when N batteries are subjected to formation and grading, so that the problems of multiple power loops, large device and line loss, high equipment cost and the like are caused. If the battery is connected in series for formation or capacity grading, the current on the series circuit can be kept consistent by only adopting one series circuit and one power supply, the performance of the battery is favorably improved, the cable is saved, and the line loss on the cable is reduced.
Based on the above, the embodiment of the invention provides a serial connection detection system for the formation and partial capacity of a lithium power battery, which is characterized in that a set of full-process detection system for the formation and partial capacity is constructed based on the form of battery serial connection formation and partial capacity, and matched currents are provided for the battery by combining an AC-DC module and a DC-DC module according to the condition that the current requirements of different numbers of batteries are different, so that the requirements of different formation and partial capacity scenes are met.
The embodiments of the present invention will be further explained with reference to the drawings.
Referring to fig. 1, an embodiment of the present invention provides a detection system, including:
the bidirectional power module comprises at least one AC-DC module and at least one DC-DC module, different powers are provided by the bidirectional power module through different combination modes of the AC-DC module and the DC-DC module, and the bidirectional power module and different numbers of batteries form a series circuit to realize charging and discharging of the batteries
The battery series main circuit is connected with the bidirectional power module and the power supplementing power supply and comprises a plurality of switch control modules and a plurality of batteries which are connected in series, and each switch control module is used for controlling the connection or online exit of a single battery;
the electricity supplementing power supply is connected with the battery series main circuit in series and used for improving the voltage of the battery series main circuit and realizing continuous charging and discharging under the condition that only one battery remains in the battery series main circuit until the cut-off voltage of a formation or capacity grading process is met;
the pressing machine comprises a probe or a clamp, the probe or the clamp is connected with the switch control module through a cable, the pressing mechanism is used for realizing the contact between the anode and the cathode of the battery and the probe or the clamp through electrical control, so that the battery is connected to the switch control module;
the control system is an information acquisition, control and interaction pivot, and controls the pressing mechanism to connect the battery with the probe or the clamp, serially connect the battery into the battery series main circuit through the switch control module, control the bidirectional power module to charge and discharge the battery on the battery series main circuit, acquire battery data in real time and control the online exit of the battery and/or execute the safety control operation of the formation and grading process flow in the process of executing the formation and grading process flow;
and the monitoring center is used for issuing an execution instruction of the formation and capacity grading technological process, monitoring the running condition of the capacity grading technological process according to the battery data, and storing, counting and analyzing the battery data.
In order to realize the serial formation or capacity grading of the batteries, a battery serial main circuit is arranged in a formation and capacity grading storage position of the detection system and is formed by connecting a plurality of switch control modules in series, and each switch control module can be connected with a single battery to charge and discharge the battery, so that the serial connection of the batteries is realized through the switch control modules connected in series. Due to the characteristics of the series circuit, the disconnection of a certain point in the series circuit can cause the disconnection of the whole series circuit, so that the battery series-connection component-capacity detection system provided by the embodiment of the invention has the function of on-line withdrawal of the battery. Specifically, for each switch control module, the switch control module comprises a straight switch and a bypass switch, the straight switch is connected with the battery in series, the bypass switch is connected in parallel with a branch circuit formed by the straight switch and the battery, when the straight switch is switched on and the bypass switch is switched off, the bidirectional power module can charge and discharge the battery, when a certain battery needs to exit the current formation or grading process, one group of straight switches is firstly switched off, a body diode or a switch on the straight switch is utilized to be connected with a diode in parallel for follow current, then the bypass switch is switched on, and finally the other group of straight switches is switched off, so that the online switching process of the current of the main circuit of the battery series from the straight circuit to the bypass is completed, and the corresponding battery can exit the formation and grading process under the condition that the main circuit of the battery series is kept connected. The direct-circuit switch and the bypass switch are controlled in an interlocking mode, and the battery short circuit and the series circuit open circuit can be prevented in the on-line switching process of current from the direct circuit to the bypass.
For the structures of the direct switch and the bypass switch, the direct switch and the bypass switch are combined by the electronic switch tube according to different battery structures and requirements, and can be placed at different positions, as shown in the circuit connection diagram of fig. 2. The structures of the direct switch and the bypass switch will be described below by specific examples.
The first example is implemented by: referring to fig. 3, the direct-current switch includes a first switch tube and a second switch tube, the bypass switch includes a third switch tube, the first switch tube, the second switch tube and the third switch tube all have a body diode or are connected in parallel with a one-way diode, the first switch tube and the second switch tube are connected in series, and one poles of the first switch tube and the third switch tube are connected. Taking the first switch tube, the second switch tube and the third switch tube as an example, the first switch tube, the second switch tube and the third switch tube all have body diodes, the direction of the body diodes is from the source electrode to the drain electrode, in the circuit structure, the first switch tube and the second switch tube are in the same branch, and the first switch tube and the third switch tube are respectively in two branches with one pole connected. As shown in fig. 2, when the battery is connected to the direct-current switch, the first switch tube and the second switch tube are turned on, the third switch tube is turned off, and the battery is withdrawn, the second switch tube is turned off, the third switch tube is turned on, so that the direct-current switch is bypassed, the current passes through the third switch tube, and the first switch tube is turned off, so that the battery is withdrawn from the main circuit in which the battery is connected in series. By the method, each switch control module can be independently controlled to realize online exit of the battery, and other batteries in the main circuit with the battery connected in series cannot be influenced. It is understood that the MOSFET is only one implementation of the switch tube, and the switch tube may also be implemented by an IGBT, a relay connected with a diode in parallel, or the like.
The second example is implemented by: referring to fig. 4, the direct-current switch includes a first switch tube and a second switch tube, the bypass switch includes a third switch tube and a fourth switch tube, the first switch tube, the second switch tube, the third switch tube and the fourth switch tube all have a body diode or are connected in parallel with a one-way diode, the first switch tube and the second switch tube are connected in series, and one poles of the first switch tube and the third switch tube are connected. Taking the first switch tube, the second switch tube, the third switch tube and the fourth switch tube as an example, the first switch tube, the second switch tube, the third switch tube and the fourth switch tube all have body diodes, the direction of the body diodes is from the source electrode to the drain electrode, in the circuit structure, the first switch tube and the second switch tube are in the same branch, the third switch tube and the fourth switch tube are in the same branch, and the first switch tube and the third switch tube are respectively in two branches with one electrode connected. As can be seen from fig. 3, when the battery is connected to the direct-current switch, the first switch tube and the second switch tube are turned on, the third switch tube is turned off, and the battery is withdrawn at this time, the second switch tube is turned off first, the current flows through the body diode or the parallel diode of the second switch tube, the third switch tube is turned on, and the fourth switch tube can be turned on or kept off, so that the direct-current switch is bypassed, the current is passed through the third switch tube, and the first switch tube is turned off, and the battery is withdrawn from the main circuit in which the battery is connected in series. Through the method, each switch control module can be independently controlled to realize the online exit of the battery. The influence on other batteries in the main circuit of the series connection of the batteries is avoided. It is understood that the MOSFET is only one implementation of the switch tube, and the switch tube may also be implemented by an IGBT, a relay connected with a diode in parallel, or the like.
It is understood that the series positional relationship between the first switch tube and the second switch tube and the battery can be adjusted as required, for example, referring to fig. 5, the first switch tube, the battery and the second switch tube are connected in series in sequence. The embodiment of the invention does not limit the series position relationship between the first switch tube and the battery and the second switch tube, does not limit the straight switch to be only composed of the first switch tube and the second switch tube, and certainly does not limit the bypass switch to be only composed of the third switch tube and the fourth switch tube. Because the composition modes are many, not listed, the function of realizing the online exit of the battery through the electronic switching tube is within the protection scope of the invention.
The switch control modules are various in installation combination, can be designed in a customized mode according to different battery requirements and installation spaces of storage positions, can be installed independently and can also be installed in a combined mode, for example, a single switch control module can be installed on a PCB, the single switch control module can be packaged in an installation box, a plurality of switch control modules can be installed on the PCB in a centralized mode, and the plurality of switch control modules can be packaged in the installation box.
The AC-DC in the bidirectional power module comprises two modes, wherein one mode is an isolation type AC-DC of a power frequency transformer, and the other mode is an isolation type AC-DC of a high-frequency transformer. The AC-DC module comprises a first input end and a first output end, the DC-DC module comprises a second input end and a second output end, the first input end is connected with the alternating current source, the first output end is connected with the second input end, and the second output end is connected with the battery series main circuit. It is noted that the bi-directional power module can be implemented in a number of ways, exemplified in several specific ways below.
Referring to fig. 6, the bidirectional power module includes an AC-DC module and a DC-DC module, a first input terminal of the AC-DC module is connected to a three-phase alternating current input, a first output terminal of the AC-DC module is a direct current output and is connected to a second input terminal of the DC-DC module, and a second output terminal of the DC-DC module is also a direct current output and is connected to an input terminal of the battery series main circuit to provide a direct current source for the battery series main circuit.
Referring to fig. 7, the bidirectional power module includes a plurality of AC-DC modules and a DC-DC module, wherein first input terminals of the plurality of AC-DC modules are all connected to a three-phase alternating current input, first output terminals of the plurality of AC-DC modules are all connected to a second input terminal of the DC-DC module, and a second output terminal of the DC-DC module is connected to an input terminal of the battery series main circuit in parallel, wherein the plurality of AC-DC modules are connected in parallel, and current sharing control is adopted between the AC-DC modules.
Referring to fig. 8, the bidirectional power module includes an AC-DC module and a plurality of DC-DC modules, wherein a first input terminal of the AC-DC module is connected to a three-phase alternating current input, a first output terminal of the AC-DC module is separated from a plurality of lines and connected to second input terminals of the plurality of DC-DC modules, and second output terminals of the plurality of DC-DC modules are connected to an input terminal of a main circuit in which a battery is connected in series, wherein the plurality of DC-DC modules are connected in parallel, and current sharing control is adopted between the DC-DC modules.
Referring to fig. 9, the bidirectional power module includes a plurality of AC-DC modules and a plurality of DC-DC modules, first input terminals of the plurality of AC-DC modules are all connected to a three-phase alternating current input, first output terminals of the plurality of AC-DC modules are separated out into a plurality of lines to be connected to second input terminals of the plurality of DC-DC modules, and second output terminals of the plurality of DC-DC modules are connected in parallel to an input terminal of the main circuit in which the battery is connected in series, wherein the plurality of AC-DC modules are connected in parallel, current sharing control is adopted between the AC-DC modules, the plurality of DC-DC modules are connected in parallel, and current sharing control is adopted between the DC-DC modules.
For the limitation of the number of batteries in the component storage position, the embodiment of the invention provides corresponding power through different combination modes of the AC-DC module and the DC-DC module. The input end of the bidirectional power module is connected with an alternating current power grid (generally connected to 380V AC or 220V AC), and the functions of taking power from the alternating current power grid and feeding the power of the battery back to the alternating current power grid are provided.
It should be understood that the above-mentioned complementary power source is a bidirectional dc power source with rectification and inversion capabilities, and the detection system includes at least one complementary power source (one or more than two parallel connections) to increase the voltage of the battery series main circuit, so as to achieve that the battery series main circuit can continue to charge and discharge with only one battery left, until the cut-off voltage of the formation or capacity-grading process is met, it should be noted that the complementary power source may be disposed at different positions in the battery series main circuit, such as between the battery and the battery of the battery series main circuit, at the start position or the end position of the battery series main circuit, and so on (in the following fig. 10 to fig. 12, the complementary power source is disposed at the start position of the battery series main circuit by way of example only), and is not limited herein.
Referring to fig. 10, when there is only one component bin and one bi-directional power module can provide enough power for the battery in the component bin, one bi-directional power module may correspond to one component bin.
Referring to fig. 11, when there are a plurality of component storage locations, and the component storage locations are connected in series through a battery series circuit, ACDC and DCDC combinations inside one bidirectional power module may refer to one-to-one, many-to-one, one-to-many, and many-to-many combinations in fig. 6 to 9, and if one bidirectional power module can provide sufficient power for batteries in the component storage locations, one bidirectional power module may correspond to a plurality of component storage locations. In some cases, if one bi-directional power module is not capable of providing sufficient power to the batteries in the component bay locations, two or more bi-directional power modules may be employed that are combined (e.g., wired in parallel) to provide sufficient power to the batteries.
Referring to fig. 12, when the number of batteries is too large, even if the batteries are all located in the same storage location, if one bidirectional power module cannot provide enough power for the batteries in the component storage location, a plurality of main battery series circuits are constructed in the component storage location, each or more than two main battery series circuits correspond to one bidirectional power module, and at this time, a plurality of bidirectional power modules correspond to one component storage location.
It can be understood that, the above is only an example of adopting different power supply modes for different battery numbers, and in combination with the above mode of combining the AC-DC module and the DC-DC module, when a single module cannot meet the current output requirement, two or more modules may be connected in parallel to achieve balanced and high-precision output of large current, so as to meet the charging and discharging current requirements of batteries with large number or large capacity.
For the press machine, the press machine comprises an air cylinder, a battery tray and a battery probe, the action of the air cylinder is controlled electrically, the position of the battery tray is controlled through the action of the air cylinder, so that the battery probe is controlled to be in contact with the positive electrode and the negative electrode of the battery, and the battery probe comprises a current probe and a voltage probe. The press machine is a working platform for mechanical transmission and compression joint of automatic production of batteries, the control system sends a control signal to the press machine, the press machine can control the tray to ascend and descend according to the control signal and control the battery probes to contact with the positive and negative electrodes of the batteries to complete physical connection between the battery series main circuit and the batteries, and the like. In addition, the press machine may also adopt a clamp type or other mechanical structure to meet the mechanical operation requirements of different chemical composition and volume of the battery, which is not listed here. It will be appreciated that the battery probe in the press machine described above may be replaced with a battery holder that performs a separation or capacity division process by contacting the positive and negative poles of the battery, in which case the holder includes a current holder and a voltage holder.
The detection system of the embodiment of the invention also comprises an information acquisition module, wherein the information acquisition module comprises a voltage detection module for detecting the voltage of the battery, the voltage detection module is in signal connection with the control system, and the control system can monitor the operation condition of the battery in real time by receiving the voltage signal of the acquisition module, so that the overvoltage and overcurrent of the battery are avoided.
In addition to the information acquisition module, the detection system of the embodiment of the invention may further include other auxiliary modules, for example, a temperature sensor acquires the anode temperature and the cathode temperature of the battery, so as to provide over-temperature monitoring for the detection system. Other auxiliary modules can be set according to monitoring needs, and are not listed.
Based on the information acquisition module, the battery series main circuit of the embodiment of the invention also has the function of preventing the reverse connection of the battery, when the battery is connected into the switch control module in the opposite direction, the voltage detection module can acquire the voltage condition in the battery series main circuit, and when the voltage exceeds the normal voltage range (such as the voltage is opposite in positive and negative), the control system can send out an alarm or disconnect the switch control module connected with the current battery, so that the danger of the reverse connection of the battery is avoided.
The specific connection relationship of the detection system of the embodiment of the invention can be seen in fig. 1, and the detection system comprises a plurality of components, mainly including a monitoring center, a control system, a bidirectional power module, a battery series main circuit, a power supply and a press machine (including a battery tray), wherein all the components are interconnected through an internal bus to complete functions of command sending, execution, information interaction and the like. For example, the monitoring center performs process editing and issuing according to the requirements of the battery formation and capacity grading process, and the process editing and issuing comprises parameter setting of step state, step time, current, upper limit voltage, lower limit voltage, cutoff current, cutoff capacity, step protection parameters, negative pressure parameters and the like, and is also responsible for data display and data analysis, namely displaying the step state, the step time, the battery voltage, the current, the capacity, the energy, the current line voltage, the auxiliary voltage, the battery anode temperature, the battery cathode temperature and the like of each series battery, and monitoring and fault alarm display of the operation conditions of the series batteries. The control system is used for system control and information acquisition, performs information interaction with the monitoring center, and performs interaction control and instruction sending with the bidirectional power module, the battery series main circuit, the power supply, the press machine and the like, for example, the control system sends a turn-on and turn-off command to the battery series main circuit according to the process flow of formation and capacity division to realize on-off control of the straight switch and the bypass switch, and the control system also receives operation condition data of all batteries of the battery series main circuit, processes the data and sends the processed data to the monitoring center.
According to the detection system for the lithium power battery to be connected in series into the formation and grading capacity, the batteries are connected in series through the battery series main circuit in the formation and grading capacity storage position, and meanwhile, the control system can independently control each battery to be withdrawn on line in the formation and grading capacity process through the independent switch control module; on the other hand, the bidirectional power module provided by the invention provides different power by adopting different combination modes of the AC-DC module and the DC-DC module, so that different current requirements when different numbers of batteries are subjected to chemical composition and capacitance processes are met.
While the preferred embodiments of the present invention have been described, the present invention is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are included in the scope of the present invention defined by the claims.
Claims (10)
1. A lithium power battery formation and capacity grading series connection detection system is characterized by comprising:
the bidirectional power module comprises at least one AC-DC module and at least one DC-DC module, different powers are provided by the bidirectional power module through different combination modes of the AC-DC module and the DC-DC module, and the bidirectional power module and different numbers of batteries form a series circuit to realize battery charging and discharging;
the battery series main circuit is connected with the bidirectional power module and the power supplementing power supply and comprises a plurality of switch control modules and a plurality of batteries which are connected in series, and each switch control module is used for controlling the connection or online exit of a single battery;
the electricity supplementing power supply is connected with the battery series main circuit in series and used for improving the voltage of the battery series main circuit and realizing continuous charging and discharging under the condition that only one battery remains in the battery series main circuit until the cut-off voltage of a formation or capacity grading process is met;
the pressing machine comprises a probe or a clamp, the probe or the clamp is connected with the switch control module through a cable, the pressing mechanism is used for realizing the contact between the anode and the cathode of the battery and the probe or the clamp through electrical control, so that the battery is connected to the switch control module;
the control system is an information acquisition, control and interaction pivot, and controls the pressing mechanism to connect the battery with the probe or the clamp, serially connect the battery into the battery series main circuit through the switch control module, control the bidirectional power module to charge and discharge the battery on the battery series main circuit, acquire battery data in real time and control the online exit of the battery and/or execute the safety control operation of the formation and grading process flow in the process of executing the formation and grading process flow;
and the monitoring center is used for issuing an execution instruction of the formation and capacity grading technological process, monitoring the running condition of the capacity grading technological process according to the battery data, and storing, counting and analyzing the battery data.
2. The detection system according to claim 1, wherein the AC-DC module comprises a first input terminal and a first output terminal, the DC-DC module comprises a second input terminal and a second output terminal, the first input terminal is connected to an AC power grid, the first output terminal is connected to the second input terminal, and the second output terminal is connected to the battery series main circuit.
3. The detection system according to claim 1, wherein the AC-DC includes two modes, one is a power frequency transformer isolated AC-DC, and the other is a high frequency transformer isolated AC-DC, the number of the AC-DC modules is two or more, the AC-DC modules are connected in parallel, the control system performs current sharing control on the AC-DC modules, the number of the DC-DC modules is two or more, the DC-DC modules are connected in parallel, and the control system performs current sharing control on the DC-DC modules.
4. The detection system of claim 1, wherein the probes comprise a current probe and a voltage probe, the clamps comprise a current clamp and a voltage clamp, and the press machine system is configured to press positive and negative electrodes of a battery on the battery tray into contact with the current probe or the current clamp, the voltage probe or the voltage clamp, respectively.
5. The detection system according to claim 1, wherein the switch control module comprises a direct switch module and a bypass switch module, the direct switch module is connected in series with the battery, the bypass switch module is connected in parallel with a branch formed by the direct switch module and the battery, and each switch control module independently controls each battery to be connected in series with the battery series main circuit or to be disconnected from the battery series main circuit.
6. The detection system according to claim 5, wherein the direct switch module and the bypass switch module are combined by a plurality of electronic switch tubes according to a battery series structure and charging and discharging requirements, and the direct switch module and the bypass switch module are controlled in an interlocking manner to realize functions of preventing the battery from being placed reversely and withdrawing the battery online.
7. The detection system of claim 5, wherein the direct switch module and the bypass switch module comprise electrically controlled switches coupled in parallel with diodes.
8. The detection system according to claim 1, wherein the power supply is a bidirectional dc power supply with rectification and inversion capabilities, and the detection system comprises at least one of the power supply to increase the dc side voltage of the bidirectional power module.
9. The detection system according to claim 1, wherein the control system further comprises an acquisition module, the acquisition module comprises a voltage detection module for detecting a battery voltage, a current detection module for detecting a battery current, and a temperature detection module for detecting a battery temperature, the control system is further configured to receive the execution instruction issued by the monitoring center and upload the battery data to the monitoring center, and the battery data comprises a battery voltage, a battery current, and a battery temperature.
10. The detection system according to claim 1, wherein the press machine is configured to control the probe or the clamp to contact or separate from the battery according to the execution instruction issued by the monitoring center.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111056951.7A CN113933726A (en) | 2021-09-09 | 2021-09-09 | Lithium power battery formation and capacity grading series connection detection system |
| PCT/CN2021/128844 WO2023035392A1 (en) | 2021-09-09 | 2021-11-05 | Series detection system for formation and capacity grading of lithium power battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111056951.7A CN113933726A (en) | 2021-09-09 | 2021-09-09 | Lithium power battery formation and capacity grading series connection detection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113933726A true CN113933726A (en) | 2022-01-14 |
Family
ID=79275320
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111056951.7A Pending CN113933726A (en) | 2021-09-09 | 2021-09-09 | Lithium power battery formation and capacity grading series connection detection system |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN113933726A (en) |
| WO (1) | WO2023035392A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114976318A (en) * | 2022-07-05 | 2022-08-30 | 东莞光亚智能科技有限公司 | Series formation module and series formation device using same |
| CN115986239A (en) * | 2023-03-20 | 2023-04-18 | 广汽埃安新能源汽车股份有限公司 | Cascade formation device |
| CN116937754A (en) * | 2023-09-15 | 2023-10-24 | 深圳市杰成镍钴新能源科技有限公司 | Retired battery discharging grid-connected device, method and storage medium |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116609681B (en) * | 2023-04-28 | 2023-12-26 | 广东恒翼能科技股份有限公司 | Chemical composition testing and warehousing method and chemical composition testing micro-grid energy-saving control system |
| CN117607516A (en) * | 2023-11-20 | 2024-02-27 | 广东恒翼能科技股份有限公司 | High-voltage distributed chemical composition testing system |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102025182A (en) * | 2010-11-30 | 2011-04-20 | 梁一桥 | Modular charging/discharging system of power battery pack of multifunctional electromobile |
| CN202134923U (en) * | 2011-06-30 | 2012-02-01 | 张文武 | Deep charging and discharging type battery energy storage paralleling device |
| CN102842731A (en) * | 2012-08-23 | 2012-12-26 | 深圳市高斯宝电气技术有限公司 | Battery capacity grading and forming system |
| CN106208214A (en) * | 2016-08-03 | 2016-12-07 | 广东技术师范学院 | A kind of energy saver being melted into for small-sized Ni-MH battery |
| CN107508332A (en) * | 2017-07-14 | 2017-12-22 | 电子科技大学 | A kind of battery impulse formation charging machine and method of work |
| CN109273788A (en) * | 2018-10-26 | 2019-01-25 | 广州擎天实业有限公司 | A kind of energy feedback type lithium dynamical battery series connection chemical conversion, partial volume device |
| CN110850294A (en) * | 2018-08-02 | 2020-02-28 | 深圳市虹鹏能源科技有限责任公司 | Battery pack testing system |
| CN112259815A (en) * | 2020-11-09 | 2021-01-22 | 深圳鼎阳智能电气有限公司 | Battery switching circuit and device in battery series formation and capacity grading system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112731253B (en) * | 2021-01-07 | 2022-02-22 | 广州擎天实业有限公司 | Method and system for calibrating and metering serial component capacity detection equipment |
-
2021
- 2021-09-09 CN CN202111056951.7A patent/CN113933726A/en active Pending
- 2021-11-05 WO PCT/CN2021/128844 patent/WO2023035392A1/en unknown
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102025182A (en) * | 2010-11-30 | 2011-04-20 | 梁一桥 | Modular charging/discharging system of power battery pack of multifunctional electromobile |
| CN202134923U (en) * | 2011-06-30 | 2012-02-01 | 张文武 | Deep charging and discharging type battery energy storage paralleling device |
| CN102842731A (en) * | 2012-08-23 | 2012-12-26 | 深圳市高斯宝电气技术有限公司 | Battery capacity grading and forming system |
| CN106208214A (en) * | 2016-08-03 | 2016-12-07 | 广东技术师范学院 | A kind of energy saver being melted into for small-sized Ni-MH battery |
| CN107508332A (en) * | 2017-07-14 | 2017-12-22 | 电子科技大学 | A kind of battery impulse formation charging machine and method of work |
| CN110850294A (en) * | 2018-08-02 | 2020-02-28 | 深圳市虹鹏能源科技有限责任公司 | Battery pack testing system |
| CN109273788A (en) * | 2018-10-26 | 2019-01-25 | 广州擎天实业有限公司 | A kind of energy feedback type lithium dynamical battery series connection chemical conversion, partial volume device |
| CN112259815A (en) * | 2020-11-09 | 2021-01-22 | 深圳鼎阳智能电气有限公司 | Battery switching circuit and device in battery series formation and capacity grading system |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114976318A (en) * | 2022-07-05 | 2022-08-30 | 东莞光亚智能科技有限公司 | Series formation module and series formation device using same |
| CN114976318B (en) * | 2022-07-05 | 2023-05-26 | 东莞光亚智能科技有限公司 | Tandem formation module and tandem formation device using same |
| CN115986239A (en) * | 2023-03-20 | 2023-04-18 | 广汽埃安新能源汽车股份有限公司 | Cascade formation device |
| CN116937754A (en) * | 2023-09-15 | 2023-10-24 | 深圳市杰成镍钴新能源科技有限公司 | Retired battery discharging grid-connected device, method and storage medium |
| CN116937754B (en) * | 2023-09-15 | 2024-01-05 | 深圳市杰成镍钴新能源科技有限公司 | Retired battery discharging grid-connected device, method and storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2023035392A1 (en) | 2023-03-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113933726A (en) | Lithium power battery formation and capacity grading series connection detection system | |
| CN113949111B (en) | Energy storage system | |
| CN107275691B (en) | Battery pack management and control system and control method | |
| US11735953B2 (en) | Apparatus and method for controlling battery module, power supply device and system | |
| CN102368630B (en) | Seamless and circulation-less switching system for two groups of DC (direct current) power supplies | |
| CN112234636A (en) | Energy storage converter direct current main contactor multi-parallel system | |
| CN212162855U (en) | High-voltage distribution box for energy storage system | |
| CN201812901U (en) | Cell module and charge module for charging cell module | |
| CN112311050A (en) | Charging device and control method thereof | |
| CN111775706A (en) | Power battery low-voltage manual maintenance switch control system and vehicle | |
| CN206099394U (en) | Quick battery charge and discharge of electric automobile and electric automobile | |
| CN115158092A (en) | Charging and discharging device, flight equipment, charging and discharging control method and control device thereof | |
| CN210693533U (en) | Open-circuit protection device for storage battery pack of transformer substation | |
| CN108365659B (en) | Battery module parallel tool and battery module parallel system | |
| CN209133642U (en) | A kind of high current short time battery discharge management system | |
| CN103165927B (en) | The control method that BOP powers, device and equipment | |
| KR20240058910A (en) | Serial detection system for formation and capacity grading of lithium power batteries | |
| CN111736081A (en) | Multi-port energy semi-closed type transformer substation storage battery charging and discharging test device and method | |
| CN220492663U (en) | Battery unit, battery module, battery cluster and battery pack | |
| CN216979252U (en) | Lithium ion battery pack series-connection charging and discharging test control device and test cabinet | |
| CN215576274U (en) | Novel BMU slave control module aging vehicle | |
| CN220964649U (en) | Series formation power supply device | |
| CN217036768U (en) | Cell charging and discharging device adopting redundant power supply | |
| CN218549569U (en) | High-voltage power supply device, whole vehicle control system and whole vehicle equipment | |
| CN215728686U (en) | Novel simulation battery system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |