CN116231816B - Cut-in constant voltage protection circuit, control method and device and computer storage medium - Google Patents

Cut-in constant voltage protection circuit, control method and device and computer storage medium Download PDF

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Publication number
CN116231816B
CN116231816B CN202310522552.8A CN202310522552A CN116231816B CN 116231816 B CN116231816 B CN 116231816B CN 202310522552 A CN202310522552 A CN 202310522552A CN 116231816 B CN116231816 B CN 116231816B
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Prior art keywords
voltage
cut
module
constant voltage
stabilizing module
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CN116231816A (en
Inventor
华麟
陈燚平
李�浩
陈成
李东升
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Shenzhen Herunda Technology Co ltd
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Shenzhen Herunda Technology Co ltd
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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
    • H01M10/44—Methods for charging or discharging
    • H01M10/446—Initial charging measures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
    • H02J7/007186—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage obtained with the battery disconnected from the charge or discharge circuit
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Protection Of Static Devices (AREA)
  • Secondary Cells (AREA)

Abstract

The invention discloses a cut-in constant voltage protection circuit, a control method, a device and a computer storage medium, which are applied to formation/capacity-division equipment for forming/capacity-division of a plurality of series-connected battery cells, wherein the circuit comprises: at least one cut-in constant voltage protection device connected in parallel with the corresponding battery cells respectively, wherein the device comprises a voltage stabilizing module and a cut-in module which are connected in series; the cut-in module is used for: when a cell connected in parallel with a corresponding cut-in constant voltage protection device enters a constant voltage protection state, a voltage stabilizing module is cut into the cell loop, the voltage value of the voltage stabilizing module after cut-in needs to meet a preset voltage condition, so that the current flowing through the cell is zero, and the current output by the constant current/constant voltage source module is bypassed by the voltage stabilizing module and then flows into other cells continuously. Therefore, the invention can effectively realize that the battery core triggering the protection condition enters the protection state, reduce the occurrence of the condition that the battery core is damaged, and not influence other battery cores to continuously finish the process steps, thereby improving the execution efficiency of the process step flow.

Description

Cut-in constant voltage protection circuit, control method and device and computer storage medium
Technical Field
The invention relates to the technical field of automatic production lines of power batteries, in particular to a cut-in constant voltage protection circuit, a control method and device and a computer storage medium.
Background
Along with the application of the automatic production line of the power battery, how to improve the formation and capacity-dividing efficiency is also more and more important. In practical application, the battery cell of the lithium battery must be charged and activated after the assembly is completed, and the first charging process of the battery cell is called formation, and is used for activating the active material in the battery cell to generate an SEI film (i.e. SolidElectrolyte Interface, solid electrolyte interface film). The battery cells are subjected to formation and then are subjected to capacity division, and the capacity division is to charge and discharge the formed battery cells so as to detect the performance of the battery cells, so that the battery cells are conveniently graded and assembled according to the capacity.
The serial formation and capacity division technology is a high-efficiency mode commonly used at present. In order to reduce the occurrence of safety accidents such as fire and the like caused by the damage of the battery core due to overcharge or overdischarge in the formation and capacity division process of the battery core, a first current path and a second current path (shown in fig. 1) are arranged in the formation and capacity division process of the battery core, wherein the current of the first current path flows to the battery core, and the current of the second current path bypasses the battery core, namely bypasses. As shown in fig. 1, a switch is respectively arranged on the first current path and the second current path, so that the first current path can be turned on or off through the switch on the first current path and bypassed through the switch on the second current path in the process of forming and capacity division of the battery core, and the current of the original first current path is bypassed through the second current path.
When a certain cell in the series circuit enters a constant voltage CV protection state of formation and capacity division, the first current path is disconnected through a switch on the first current path, and the second current path is conducted through a switch on the second current path, so that current still flows into the cell.
For example: if the cell A1 in fig. 1 reaches the constant voltage protection point first, K1' is closed while K1 is opened, so that the current bypasses the cell A1, and other cells are not affected, and the current process is continued.
However, it is found through practice that when the battery cells are formed and divided by using the related technology such as that shown in fig. 1, the battery cells are damaged due to factors such as the action time sequence of K1 and K1', the clean and sharp degree of action, and the like, and meanwhile, voltage and current mutation is caused to trigger the step protection. In addition, when high current flows, additional power consumption is brought by K1 and K1' in the circuit, and the electricity utilization efficiency is reduced.
Disclosure of Invention
The invention provides a cut-in constant voltage protection circuit, a control method, a control device and a computer storage medium, which can effectively reduce the occurrence of the damage of a battery cell and can also be beneficial to improving the energy utilization efficiency.
The invention discloses a cut-in constant voltage protection circuit, which is applied to formation/capacity-division equipment in an automatic power battery production line, wherein the formation/capacity-division equipment is used for carrying out formation/capacity division on a plurality of battery cores connected in series through a constant current/constant voltage source module;
the cut-in constant voltage protection circuit includes: at least one cut-in constant voltage protection device; each cut-in type constant voltage protection device is connected with the corresponding battery cell in parallel respectively, and the cut-in type constant voltage protection device comprises: the voltage stabilizing module is connected in series and the cut-in module;
for any one of the cut-in constant voltage protection devices, the cut-in module is configured to:
when a target cell connected in parallel with the cut-in constant voltage protection device enters a predetermined constant voltage protection state, cutting in the voltage stabilizing module connected in series with the cut-in module into a loop where the target cell is located;
after the voltage stabilizing module connected in series with the switching-in module is switched into a loop where the target battery cell is located, the voltage value of the voltage stabilizing module needs to meet a preset voltage condition, the current output by the constant current/constant voltage source module is zero, the current output by the constant current/constant voltage source module is bypassed by the voltage stabilizing module and then flows into other battery cells which do not enter the constant voltage protection state at present, so that the other battery cells continue to perform the current process flow; the zero current flowing through the target cell comprises: the current into the target cell is zero and the current out of the target cell is zero.
As an optional implementation manner, in the first aspect of the present invention, the voltage value meeting the preset voltage condition includes: the voltage value is equal to the current voltage value of the target battery cell;
and, the hand-in module is further configured to:
when all the series-connected battery cells need to enter the next process flow, the voltage stabilizing module connected in series with the cut-in module is controlled to be disconnected from the loop where the target battery cell is located, so that the target battery cell and the other battery cells synchronously enter a new process flow.
As an alternative embodiment, in the first aspect of the present invention, the cut-in module includes a control switch;
the first end of the control switch is used for being electrically connected with the positive electrode of the target battery cell, the second end of the control switch is electrically connected with the first end of the voltage stabilizing module, and the second end of the voltage stabilizing module is used for being electrically connected with the negative electrode of the target battery cell;
when the voltage stabilizing module cuts into a loop where the target battery cell is located, the voltage of the second end of the voltage stabilizing module is lower than that of the first end of the voltage stabilizing module.
As an optional implementation manner, in the first aspect of the present invention, the cut-in constant voltage protection device further includes:
The voltage detection control module is electrically connected with the voltage stabilizing module in the cut-in constant voltage protection device;
wherein, the voltage detection control module is used for:
when the corresponding battery core enters the constant voltage protection state, the voltage value of the voltage stabilizing module electrically connected with the voltage detection control module is adjusted so that the voltage value of the voltage stabilizing module electrically connected with the voltage detection control module meets the preset voltage condition.
As an optional implementation manner, in the first aspect of the present invention, the voltage detection control module is further configured to:
when the corresponding battery core enters the constant voltage protection state, collecting a voltage value of the voltage stabilizing module electrically connected with the voltage detection control module, and judging whether the voltage value of the voltage stabilizing module electrically connected with the voltage detection control module meets the preset voltage condition; when the voltage value of the voltage stabilizing module electrically connected with the voltage detection control module is judged not to meet the preset voltage condition, triggering and executing the operation of adjusting the voltage value of the voltage stabilizing module electrically connected with the voltage detection control module so that the voltage value of the voltage stabilizing module electrically connected with the voltage detection control module meets the preset voltage condition; the method comprises the steps of,
When the voltage value of the voltage stabilizing module electrically connected with the voltage detection control module meets the preset voltage condition, a cut-in instruction is sent to the cut-in module or a control system of the formation/capacity-division equipment, and the cut-in instruction is used for indicating that the voltage stabilizing module electrically connected with the voltage detection control module currently meets a loop cut-in condition.
In an optional implementation manner, in the first aspect of the present invention, a specific manner in which the switching-in module switches the voltage stabilizing module connected in series with the switching-in module and having a voltage value meeting a preset voltage condition into a loop where the target battery cell is located includes:
and detecting whether a loop cut-in instruction exists, and when the loop cut-in instruction exists, cutting in the voltage stabilizing module connected in series with the cut-in module into a loop where the target battery cell is located, wherein the loop cut-in instruction is generated according to the cut-in instruction.
As an alternative embodiment, in the first aspect of the present invention, the total number of all the cut-in type constant voltage protection devices is the same as the total number of all the cells connected in series, and one of the cut-in type constant voltage protection devices is connected in parallel to one of the cells.
As an optional implementation manner, in the first aspect of the present invention, the target cell connected in parallel with the cut-in constant voltage protection device enters the constant voltage protection state, including:
in a constant voltage charge/discharge mode, the target cell connected in parallel with the cut-in constant voltage protection device enters the constant voltage protection state; or alternatively, the process may be performed,
and under a constant-current charge/discharge mode, the target battery cell connected in parallel with the cut-in constant-voltage protection device enters the constant-voltage protection state.
The second aspect of the present invention discloses a control method of a cut-in constant voltage protection circuit, the cut-in constant voltage protection circuit includes any one of the cut-in constant voltage protection circuits described in the first aspect of the present invention, the method includes:
judging whether target cells entering a predetermined constant voltage protection state exist in all the cells connected in series;
when the target battery core exists, a voltage stabilizing module in a cut-in type constant voltage protection device connected in parallel with the target battery core is cut into a loop where the target battery core is located;
after the voltage stabilizing module cuts into a loop where the target battery cell is located, the voltage value of the voltage stabilizing module needs to meet a preset voltage condition, and current output by a constant current/constant voltage source module for providing current for formation/capacity division of all the battery cells is zero, and current output by the constant current/constant voltage source module is bypassed by the voltage stabilizing module and then flows into other battery cells which do not enter the constant voltage protection state at present, so that the other battery cells continue to perform the current process flow; the zero current flowing through the target cell comprises: the current into the target cell is zero and the current out of the target cell is zero.
As an alternative embodiment, in the second aspect of the present invention, the method further includes:
when all the series-connected battery cells need to enter the next process flow, the loop where the voltage stabilizing module and the target battery cell are located is controlled to be disconnected, so that the target battery cell and the other battery cells synchronously enter a new process flow.
As an alternative embodiment, in the second aspect of the present invention, the method further includes:
when the target battery core exists, adjusting the voltage value of a voltage stabilizing module in the cut-in type constant voltage protection device connected with the target battery core in parallel, so that the voltage value of the voltage stabilizing module meets the preset voltage condition.
As an alternative embodiment, in the second aspect of the present invention, the method further includes:
when the target battery core exists, collecting a voltage value of a voltage stabilizing module in a cut-in type constant voltage protection device connected in parallel with the target battery core, and judging whether the voltage value of the voltage stabilizing module meets a preset voltage condition; when the voltage value of the voltage stabilizing module does not meet the preset voltage condition, triggering and executing the voltage value of the voltage stabilizing module in the cut-in type constant voltage protection device connected with the target battery cell in parallel so as to enable the voltage value of the voltage stabilizing module to meet the preset voltage condition;
And when the voltage value of the voltage stabilizing module meets the preset voltage condition, sending a cut-in instruction to a cut-in type constant voltage protection device connected with the target battery cell in parallel, wherein the cut-in instruction is used for indicating that the voltage stabilizing module in the cut-in type constant voltage protection device connected with the target battery cell in parallel currently meets a loop cut-in condition.
In a second aspect of the present invention, when the target cell exists, the switching-in type constant voltage protection device connected in parallel to the target cell switches in a loop where the target cell is located, where the switching-in type constant voltage protection device includes:
and when the loop switching-in instruction is detected to exist, switching a voltage stabilizing module in a switching-in type constant voltage protection device connected in parallel with the target battery cell into a loop where the target battery cell is located, wherein the loop switching-in instruction is generated according to the switching-in instruction.
A third aspect of the present invention discloses a control device for a cut-in constant voltage protection circuit, the cut-in constant voltage protection circuit including any one of the first aspects of the present invention, the device comprising:
The judging module is used for judging whether target cells entering a predetermined constant voltage protection state exist in all the cells connected in series;
the battery cell protection control module is used for switching in a voltage stabilizing module in the cut-in type constant voltage protection device connected in parallel with the target battery cell into a loop where the target battery cell is located when the judging module judges that the target battery cell exists;
after the voltage stabilizing module cuts into a loop where the target battery cell is located, the voltage value of the voltage stabilizing module needs to meet a preset voltage condition, and current output by a constant current/constant voltage source module for providing current for formation/capacity division of all the battery cells is zero, and current output by the constant current/constant voltage source module is bypassed by the voltage stabilizing module and then flows into other battery cells which do not enter the constant voltage protection state at present, so that the other battery cells continue to perform the current process flow; the zero current flowing through the target cell comprises: the current into the target cell is zero and the current out of the target cell is zero.
As an optional implementation manner, in the third aspect of the present invention, the cell protection control module is further configured to:
When all the series-connected battery cells need to enter the next process flow, the loop where the voltage stabilizing module and the target battery cell are located is controlled to be disconnected, so that the target battery cell and the other battery cells synchronously enter a new process flow.
As an optional implementation manner, in the third aspect of the present invention, the cell protection control module is further configured to:
when the target battery core exists, adjusting the voltage value of a voltage stabilizing module in the cut-in type constant voltage protection device connected with the target battery core in parallel, so that the voltage value of the voltage stabilizing module meets the preset voltage condition.
As an optional implementation manner, in the third aspect of the present invention, the cell protection control module is further configured to:
when the target battery core exists, collecting a voltage value of a voltage stabilizing module in a cut-in type constant voltage protection device connected in parallel with the target battery core, and judging whether the voltage value of the voltage stabilizing module meets a preset voltage condition; when the voltage value of the voltage stabilizing module does not meet the preset voltage condition, triggering and executing the voltage value of the voltage stabilizing module in the cut-in type constant voltage protection device connected with the target battery cell in parallel so as to enable the voltage value of the voltage stabilizing module to meet the preset voltage condition;
And when the voltage value of the voltage stabilizing module meets the preset voltage condition, sending a cut-in instruction to a cut-in type constant voltage protection device connected with the target battery cell in parallel, wherein the cut-in instruction is used for indicating that the voltage stabilizing module in the cut-in type constant voltage protection device connected with the target battery cell in parallel currently meets a loop cut-in condition.
As an optional implementation manner, in the third aspect of the present invention, when the target battery cell exists, a specific manner that the battery cell protection control module cuts the voltage stabilizing module in the cut-in type constant voltage protection device connected in parallel to the target battery cell into a loop where the target battery cell is located includes:
and detecting whether a loop switching-in instruction exists, and switching in a voltage stabilizing module in a switching-in type constant voltage protection device connected in parallel with the target battery cell into a loop where the target battery cell is located when the loop switching-in instruction exists, wherein the loop switching-in instruction is generated according to the switching-in instruction.
A fourth aspect of the present invention discloses a control device for a cut-in constant voltage protection circuit, the cut-in constant voltage protection circuit including any one of the first aspect of the present invention, the device comprising:
A memory storing executable program code;
a processor coupled to the memory;
the processor invokes the executable program code stored in the memory to perform part or all of the steps of the control method of the cut-in constant voltage protection circuit described in any one of the second aspects of the present invention.
A fifth aspect of the present invention discloses a computer storage medium storing computer instructions for executing part or all of the steps of the control method of the cut-in constant voltage protection circuit described in any of the second aspects of the present invention when the computer instructions are called.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
in the invention, a plurality of series-connected cells needing to be formed/divided can be connected with a corresponding cut-in constant voltage protection device in parallel, the cut-in constant voltage protection device comprises a voltage stabilizing module and a cut-in module which are connected in series, when any cell enters a constant voltage protection state, the voltage stabilizing module with the voltage value meeting the preset voltage condition is cut into a loop where the cell is positioned, so that the current output by the constant current/constant voltage source module is zero (namely, the current entering the cell is zero and the current flowing out of the cell is zero), and the current output by the constant current/constant voltage source module is bypassed by the voltage stabilizing module and then continuously flows into other cells which do not enter the constant voltage protection state at present, so that the current process flow of the other cells is continued, the situation that the cell triggering the protection condition enters the protection state can be effectively realized, the situation that the cell is damaged is reduced, the other cells continue to complete the process flow is not influenced, and the execution efficiency of the process flow is improved;
Furthermore, when the battery core enters a constant voltage protection state, the protection voltage of the battery core is equal to the voltage of the voltage stabilizing module, a switch cut into the module can realize zero-voltage difference switching, and no switching stress exists;
furthermore, in the cell series circuit, no current or voltage mutation exists, smooth switching is realized, no stress exists, and the step protection caused by voltage and current mutation can be effectively reduced;
furthermore, the cut-in module (such as the control switch) is cut in only when the constant voltage protection is started, and the cut-in module is not in a normal process step execution loop before cut-in, that is, no current flows through the cut-in module (such as the control switch) before cut-in, so that no loss is caused, and the energy utilization efficiency is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a prior art disclosed cell protection circuit;
Fig. 2 is a schematic diagram of a cut-in constant voltage protection circuit according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a cut-in type constant voltage protection circuit for protecting a battery cell in a constant current charge/discharge mode according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of a control method of a cut-in constant voltage protection circuit according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a control device of a cut-in constant voltage protection circuit according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a control device of another cut-in constant voltage protection circuit according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The terms first, second and the like in the description and in the claims and in the above-described figures are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, apparatus, article, or article that comprises a list of steps or elements is not limited to only those listed but may optionally include other steps or elements not listed or inherent to such process, method, article, or article.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the invention. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
The invention discloses a cut-in constant voltage protection circuit and a control method and a control device thereof, which can effectively realize that a battery core triggering a protection condition enters a protection state, reduce the occurrence of the condition that the battery core is damaged and do not influence other battery cores to continuously finish a process step, and improve the execution efficiency of the process step flow; furthermore, when the battery core enters a constant voltage protection state, the protection voltage of the battery core is equal to the voltage of the voltage stabilizing module, a switch cut into the module can realize zero-voltage difference switching, and no switching stress exists; furthermore, in the cell series circuit, no current or voltage mutation exists, smooth switching is realized, no stress exists, and the step protection caused by voltage and current mutation can be effectively reduced; furthermore, the cut-in module (such as the control switch) is cut in only when the constant voltage protection is started, and the cut-in module is not in a normal process step execution loop before cut-in, that is, no current flows through the cut-in module (such as the control switch) before cut-in, so that no loss is caused, and the energy utilization efficiency is improved. What needs to be specifically stated is: in the process steps of serial formation/capacity division, such as constant-current charge/discharge, constant-voltage charge/discharge and the like, the battery cells can be effectively protected through the cut-in protection mode. The following will describe in detail.
Example 1
Referring to fig. 2, fig. 2 is a schematic diagram of a cut-in constant voltage protection circuit according to an embodiment of the invention. The cut-in constant voltage protection circuit described in fig. 2 is applied to a formation/capacity-dividing device in an automatic power battery production line, and the formation/capacity-dividing device is used for performing formation/capacity division on a plurality of battery cells connected in series through a constant current/constant voltage source module. Specifically, as shown in fig. 2, the cut-in type constant voltage protection circuit may include:
at least one cut-in constant voltage protection device 10; each cut-in constant voltage protection device 10 is connected in parallel with a corresponding cell, and the cut-in constant voltage protection device 10 includes: the series-connected voltage stabilizing module 101 and the cut-in module 102.
For any cut-in type constant voltage protection device 10, a cut-in module 102 is included for:
when the target cell connected in parallel with the cut-in constant voltage protection device 10 enters a predetermined constant voltage protection state, the voltage stabilizing module 101 connected in series with the cut-in module 102 is cut into the circuit in which the target cell is located.
After the voltage stabilizing module 101 connected in series with the switching-in module 102 and having a voltage value meeting a preset voltage condition is switched in a loop where the target cell is located, the voltage value of the voltage stabilizing module needs to meet the preset voltage condition, the current output by the constant current/constant voltage source module, the current flowing through the target cell is zero, and the current output by the constant current/constant voltage source module is bypassed by the voltage stabilizing module and then continuously flows into other cells which do not enter the constant voltage protection state at present, so that the other cells continue to perform the current process. Specifically, the zero current flowing through the target cell includes: the current into the target cell is zero and the current out of the target cell is zero.
Optionally, the target battery core may enter the constant voltage protection state in the constant current charging/discharging mode, or may enter the constant voltage protection state in the constant voltage charging/discharging mode, which is not limited in the embodiment of the present invention.
What needs to be specifically stated is: in practical applications, the voltage value adjustment of the voltage stabilizing module 101 and the switching-in of the voltage stabilizing module 101 may be performed synchronously, or the voltage value may be adjusted first and then switched in a circuit where the battery cell is located. Preferably, the voltage value is adjusted first and then switched into the loop where the battery core is located, so that zero differential voltage switching is further guaranteed, and no switching stress exists.
Therefore, the cut-in constant voltage protection circuit shown in fig. 2 can effectively realize that the battery core triggering the protection condition enters the protection state, reduce the occurrence of the damage condition of the battery core and does not influence other battery cores to continuously complete the process steps, and improve the execution efficiency of the process steps; furthermore, the cut-in module 102 is cut-in only when the constant voltage protection is started, and the cut-in module 102 is not in a normal step execution loop before cut-in, that is, no current flows through the cut-in module 102 before cut-in, no loss is caused, and the energy utilization efficiency is improved.
In an alternative embodiment, the voltage value of the voltage stabilizing module 101 meeting the preset voltage condition includes: the voltage value of the voltage stabilizing module 101 is equal to the current voltage value of the target battery cell, or the absolute value of the voltage difference between the voltage value of the voltage stabilizing module 101 and the current voltage value of the target battery cell is smaller than or equal to a preset voltage threshold.
In this alternative embodiment, the voltage value satisfies the preset voltage condition preferably, that is, the voltage value of the voltage stabilizing module 101 satisfies the preset voltage condition preferably, the voltage value of the voltage stabilizing module 101 is equal to the current voltage value of the target battery cell, so that when the battery cell enters the constant voltage protection state, the protection voltage of the battery cell is equal to the voltage of the voltage stabilizing module, and the control switch in the cut-in module 102 can achieve zero-voltage difference switching without switching stress.
In another alternative embodiment, the lancing module 102 can also be used to:
when all the series-connected cells need to enter the next process, the voltage stabilizing module 101 connected in series with the cut-in module 102 is controlled to be disconnected from the loop where the target cell is located, so that the target cell and other cells enter a new process synchronously.
It can be seen that, in this alternative embodiment, after the constant voltage protection is triggered by the battery cells, if the current process is finished and a new process is needed to be performed, the voltage stabilizing module 101 is disconnected from the circuit where the corresponding battery cell is located, so as to ensure that all the battery cells enter the new process synchronously, and further ensure that the process is performed normally.
In yet another alternative embodiment, as shown in FIG. 2, the lancing module 102 can specifically include a control switch, wherein:
the first end of the control switch is used for being electrically connected with the positive electrode of the target battery cell, the second end of the control switch is electrically connected with the first end of the voltage stabilizing module 101, and the second end of the voltage stabilizing module 101 is used for being electrically connected with the negative electrode of the target battery cell;
and when the voltage stabilizing module 101 cuts into a loop where the target battery cell is located, the voltage of the second end of the voltage stabilizing module 101 is lower than the voltage of the first end of the voltage stabilizing module 101.
Therefore, in this optional embodiment, the voltage stabilizing module 101 can be switched into the loop where the corresponding battery cell is located or disconnected from the loop where the corresponding battery cell is located through the control switch, which is beneficial to improving the control efficiency and control convenience of switching in or switching out the voltage stabilizing module, and has low cost.
In yet another alternative embodiment, the cut-in constant voltage protection device 10 further comprises:
the voltage detection control module 103, the voltage detection control module 103 is electrically connected with the voltage stabilizing module 101 in the cut-in constant voltage protection device;
wherein, the voltage detection control module 103 is used for:
when the corresponding battery cell enters the constant voltage protection state, the voltage value of the voltage stabilizing module 101 electrically connected with the voltage detection control module 103 is adjusted so that the voltage value of the voltage stabilizing module 101 electrically connected with the voltage detection control module 103 meets the preset voltage condition (for example, the voltage value of the voltage stabilizing module 101 is equal to the current voltage value of the corresponding battery cell).
Further optionally, the voltage detection control module 103 may be further configured to be electrically connected to a corresponding electrical core, so that collection of a current voltage value of the electrical core and adjustment of a voltage value of the voltage stabilizing module 101 can be achieved based on the voltage detection control module 103, which is beneficial to improving adjustment efficiency and adjustment accuracy of the voltage value of the voltage stabilizing module 101.
Further optionally, the voltage detection control module 103 is further configured to:
when the corresponding battery core enters a constant voltage protection state, collecting a voltage value of the voltage stabilizing module 101 electrically connected with the voltage detection control module 103, and judging whether the voltage value of the voltage stabilizing module 101 electrically connected with the voltage detection control module 103 meets a preset voltage condition; when it is determined that the voltage value of the voltage stabilizing module 101 electrically connected to the voltage detection control module 103 does not satisfy the preset voltage condition, the voltage value of the voltage stabilizing module 101 electrically connected to the voltage detection control module 103 is triggered and adjusted so that the voltage value of the voltage stabilizing module 101 electrically connected to the voltage detection control module 103 satisfies the preset voltage condition.
It can be seen that this alternative embodiment can also determine the voltage value of the voltage stabilizing module 101 before adjusting the voltage value of the voltage stabilizing module 101, which is beneficial to reducing unnecessary voltage value adjustment operations.
Still further, the voltage detection control module 103 is further configured to:
when the corresponding cell enters a constant voltage protection state and the voltage value of the voltage stabilizing module 101 electrically connected with the voltage detection control module 103 meets a preset voltage condition, a cut-in indication is sent to the cut-in module 102 or a control system (such as a neutral position machine) of the formation/capacity-division equipment, and the cut-in indication is used for indicating that the voltage stabilizing module 101 electrically connected with the voltage detection control module 103 currently meets a loop cut-in condition.
It can be seen that, in this alternative embodiment, when the voltage value of the voltage stabilizing module 101 electrically connected to the voltage detection control module 103 meets the preset voltage condition, a corresponding cut-in instruction can be generated, which is beneficial to improving the cut-in control accuracy of the voltage stabilizing module 101, and also can ensure that the cut-in module 102 realizes zero-voltage difference switching when the voltage stabilizing module 101 is cut into the loop where the battery cell is located, and has no switching stress.
In yet another alternative embodiment, when the target cell connected in parallel with the cut-in type constant voltage protection device 10 enters a predetermined constant voltage protection state, the voltage stabilizing module 101 connected in series with the cut-in module 102 and having a voltage value meeting a preset voltage condition by the cut-in module 102 may be cut into a loop where the target cell is located in a specific manner including:
Whether a loop cut-in command exists or not is detected, and when the loop cut-in command exists, the voltage stabilizing module 101 connected in series with the cut-in module 102 is cut into the loop where the target cell is located.
Alternatively, the loop cut-in command may be generated by the cut-in module 102, or may be sent by a control system (such as a median machine) of the chemical/volume-dividing device, which is not limited in the embodiment of the present invention.
Therefore, the alternative embodiment can realize the loop switching control of the voltage stabilizing module 101 based on the loop switching instruction, which is beneficial to further improving the accuracy of the loop where the voltage stabilizing module 101 is switched into the battery cell.
Alternatively, the total number of all the cut-in constant voltage protection devices 10 is the same as the total number of all the cells connected in series, and one cut-in constant voltage protection device 10 is connected in parallel with one cell, that is: each of all the cells connected in series is respectively connected with a cut-in constant voltage protection device 10 in parallel, so that cut-in constant voltage protection is realized when all the cells enter a constant voltage protection state.
Optionally, any function of any one of the voltage stabilizing module 101, the cut-in module 102 and the voltage detection control module 103 may be determined by the corresponding module when implemented, or may be completed under the control of a control system (such as a median machine, etc.), for example: the median machine sends the corresponding control instruction or the corresponding instruction to the corresponding module, and the embodiment of the invention is not limited.
What needs to be specifically stated is: in a specific application, the cut-in constant voltage protection circuit applied to the constant current charging mode of the battery cell may be shown as 3-a in fig. 3, and the cut-in constant voltage protection circuit applied to the constant current discharging mode of the battery cell may be shown as 3-B in fig. 3. Compared with 3-A, the current direction of the constant current source module in 3-B is changed, and the principle of constant voltage protection of the battery core by the cut-in constant voltage protection circuit is the same.
Taking cell charging as an example: referring to fig. 2, the cells A1, A2, … … and An are connected in series, and the series connected cells A1-An begin to be formed and divided at the same time. When the battery cell A1 reaches the step protection voltage stabilizing value V1 at first, K1 is closed, the voltage stabilizing module DZ1 is cut into the loop, meanwhile, the voltage detection control module adjusts the voltage of the voltage stabilizing module DZ1 to be equal to V1, and at the moment, the charging current flows into the battery cell A2 … … An through the DZ1 and does not flow into the battery cell A1, so that other battery cells connected in series continue to finish the step. And the battery cell A1 does not flow out of current, and the battery cell A1 is protected by the constant voltage V1. When the formation/capacity division enters the next process step, the control system (such as a median machine) commands that the corresponding K1 is disconnected, so that all the cells in the series circuit enter a new process step flow. The constant voltage protection process when other battery cells reach the constant voltage protection state is the same as the constant voltage protection process when the battery cell A1 reaches the constant voltage protection state, and is not illustrated one by one.
Example two
Referring to fig. 4, fig. 4 is a flow chart of a control method of a cut-in type constant voltage protection circuit according to an embodiment of the invention. The manner described in fig. 4 is used to implement control of the cut-in constant voltage protection circuit, and the cut-in constant voltage protection circuit may alternatively refer to any one of the cut-in constant voltage protection circuits described in the first embodiment, which is not limited in the embodiments of the present invention. As shown in fig. 4, the control method may include the steps of:
201. judging whether target cells entering a predetermined constant voltage protection state exist in all the cells connected in series;
202. when a target battery core exists, a voltage stabilizing module in the cut-in type constant voltage protection device connected in parallel with the target battery core is cut into a loop where the target battery core is located;
after the voltage stabilizing module cuts into a loop where the target battery cell is located, the voltage value of the voltage stabilizing module needs to meet a preset voltage condition, the current output by the constant current/constant voltage source module for providing current for formation/capacity division of all battery cells is zero, the current flowing through the target battery cell is zero, and the current output by the constant current/constant voltage source module is bypassed by the voltage stabilizing module and then flows into other battery cells which do not enter a constant voltage protection state at present, so that the other battery cells continue to perform the current process. Specifically, the zero current flowing through the target cell includes: the current into the target cell is zero and the current out of the target cell is zero.
Optionally, the voltage value of the voltage stabilizing module meeting the preset voltage condition includes: the voltage value of the voltage stabilizing module is equal to the current voltage value of the target battery cell, or the absolute value of the voltage difference value between the voltage value of the voltage stabilizing module and the current voltage value of the target battery cell is smaller than or equal to a preset voltage threshold value. In the embodiment of the invention, the voltage value meets the preset voltage condition, namely the voltage value of the voltage stabilizing module meets the preset voltage condition, and the voltage value of the voltage stabilizing module is preferably equal to the current voltage value of the target battery core, so that when the battery core enters a constant voltage protection state, the protection voltage of the battery core is equal to the voltage of the voltage stabilizing module, and a switch in the cut-in module can realize zero-voltage difference switching without switching stress.
Therefore, by implementing the method described in fig. 4, the cell triggering the protection condition can be effectively brought into the protection state, the situation that the cell is damaged is reduced, the other cells are not influenced to continue to finish the process, and the execution efficiency of the process is improved; furthermore, the cutting-in module cuts in only when the constant voltage protection is started, and the cutting-in module is not in a normal work step execution loop before cutting-in, namely no current flows through the cutting-in module before cutting-in, no loss is caused, and the energy utilization efficiency is improved.
In an alternative embodiment, as shown in fig. 4, the control method may further include:
203. when all the series-connected battery cells need to enter the next process flow, the loop where the voltage stabilizing module and the target battery cell are located is controlled to be disconnected, so that the target battery cell and other battery cells synchronously enter a new process flow.
It can be seen that, after the constant voltage protection is triggered by the battery cells, if the current process is finished and a new process is needed to be performed, the voltage stabilizing module is disconnected from the circuit where the corresponding battery cell is located, so that all the battery cells can be ensured to enter the new process synchronously, and the normal performance of the process is ensured.
In another alternative embodiment, the control method may further include:
when the target battery core exists, the voltage value of the voltage stabilizing module in the cut-in type constant voltage protection device connected with the target battery core in parallel is adjusted so that the voltage value of the voltage stabilizing module meets the preset voltage condition.
Further, after the voltage value of the voltage stabilizing module meets the preset voltage condition, the operation of cutting the voltage stabilizing module into the loop where the target battery cell is located is triggered.
Therefore, the optional embodiment can also intelligently realize the adjustment of the voltage value of the voltage stabilizing module, thereby being beneficial to improving the adjustment efficiency and the adjustment accuracy of the voltage value of the voltage stabilizing module; in addition, after the voltage value of the voltage stabilizing module is adjusted to meet the requirement, the voltage stabilizing module is cut into a loop where a corresponding battery core is located, so that zero-voltage-difference cut-in is realized.
In yet another alternative embodiment, the control method may further include:
when a target cell exists, collecting a voltage value of a voltage stabilizing module in the cut-in type constant voltage protection device connected in parallel with the target cell, and judging whether the voltage value of the voltage stabilizing module meets a preset voltage condition; when the voltage value of the voltage stabilizing module is judged not to meet the preset voltage condition, the voltage value of the voltage stabilizing module in the cut-in type constant voltage protection device which is connected with the target battery cell in parallel is triggered and regulated, so that the voltage value of the voltage stabilizing module meets the operation of the preset voltage condition.
It can be seen that this alternative embodiment can also determine the voltage value of the voltage stabilizing module 101 before adjusting the voltage value of the voltage stabilizing module, which is beneficial to reducing unnecessary voltage value adjustment operations.
Further, the control method may further include:
when the target battery core exists and the voltage value of the voltage stabilizing module is judged to meet the preset voltage condition, a cut-in instruction is sent to the cut-in type constant voltage protection device connected with the target battery core in parallel, and the cut-in instruction is used for indicating that the voltage stabilizing module in the cut-in type constant voltage protection device connected with the target battery core in parallel currently meets the loop cut-in condition.
It can be seen that this alternative embodiment can also be favorable to improving the switching control accuracy of voltage stabilizing module, and can also guarantee that the switching module realizes zero differential pressure switching when cutting the voltage stabilizing module into the return circuit that the electric core is located, does not have switching stress.
Further, when the target battery cell exists, the loop where the voltage stabilizing module in the cut-in type constant voltage protection device connected in parallel with the target battery cell cuts in the target battery cell includes:
and detecting whether a loop cut-in instruction exists, and cutting in a voltage stabilizing module in the cut-in type constant voltage protection device connected in parallel with the target cell into a loop where the target cell is located when the loop cut-in instruction exists, wherein the loop cut-in instruction is generated according to the cut-in instruction.
Therefore, the alternative embodiment not only can realize intelligent control of switching-in of the voltage stabilizing module to the cell loop through the loop switching-in instruction, but also can ensure that the voltage stabilizing module is controlled to switch-in again when the voltage value of the voltage stabilizing module meets the preset voltage requirement, thereby ensuring zero-voltage difference switching and no switching stress.
It should be noted that: for other detailed descriptions of the embodiments of the present invention, please refer to the related descriptions of the first embodiment, and the detailed description of the embodiments of the present invention is not repeated.
Example III
Referring to fig. 5, fig. 5 is a schematic diagram of a control device of a cut-in type constant voltage protection circuit according to an embodiment of the invention. The control device described in fig. 5 is used to control the cut-in constant voltage protection circuit, and the cut-in constant voltage protection circuit may be any of the cut-in constant voltage protection circuits described in the first embodiment. As shown in fig. 5, the control device includes:
a judging module 301, configured to judge whether a target cell entering a predetermined constant voltage protection state exists in all the cells connected in series;
and the battery cell protection control module 302 is configured to cut the voltage stabilizing module in the cut-in type constant voltage protection device connected in parallel with the target battery cell into a loop where the target battery cell is located when the judging module 301 judges that the target battery cell exists.
After the voltage stabilizing module cuts into a loop where the target battery cell is located, the voltage value of the voltage stabilizing module needs to meet a preset voltage condition, the current output by the constant current/constant voltage source module for providing current for formation/capacity division of all battery cells is zero, the current flowing through the target battery cell is zero, and the current output by the constant current/constant voltage source module is bypassed by the voltage stabilizing module and then flows into other battery cells which do not enter a constant voltage protection state at present, so that the other battery cells continue to perform the current process. Specifically, the zero current flowing through the target cell includes: the current into the target cell is zero and the current out of the target cell is zero.
Therefore, the control device described in fig. 5 can effectively realize that the battery core triggering the protection condition enters the protection state, reduce the occurrence of the damage condition of the battery core and does not influence other battery cores to continuously complete the process steps, and improve the execution efficiency of the process steps; furthermore, the cutting-in module cuts in only when the constant voltage protection is started, and the cutting-in module is not in a normal work step execution loop before cutting-in, namely no current flows through the cutting-in module before cutting-in, no loss is caused, and the energy utilization efficiency is improved.
In an alternative embodiment, the cell protection control module 302 is further configured to:
when all the series-connected battery cells need to enter the next process flow, the loop where the voltage stabilizing module and the target battery cell are located is controlled to be disconnected, so that the target battery cell and other battery cells synchronously enter a new process flow.
It can be seen that, after the constant voltage protection is triggered by the battery cells, if the current process is finished and a new process is needed to be performed, the voltage stabilizing module is disconnected from the circuit where the corresponding battery cell is located, so that all the battery cells can be ensured to enter the new process synchronously, and the normal performance of the process is ensured.
In an alternative embodiment, the cell protection control module 302 is further configured to:
When the target battery core exists, the voltage value of the voltage stabilizing module in the cut-in type constant voltage protection device connected with the target battery core in parallel is adjusted so that the voltage value of the voltage stabilizing module meets the preset voltage condition.
Further, after the voltage value of the voltage stabilizing module meets the preset voltage condition, the operation of cutting the voltage stabilizing module into the loop where the target battery cell is located is triggered.
Therefore, the optional embodiment can also intelligently realize the adjustment of the voltage value of the voltage stabilizing module, thereby being beneficial to improving the adjustment efficiency and the adjustment accuracy of the voltage value of the voltage stabilizing module; in addition, after the voltage value of the voltage stabilizing module is adjusted to meet the requirement, the voltage stabilizing module is cut into a loop where a corresponding battery core is located, so that zero-voltage-difference cut-in is realized.
In yet another alternative embodiment, the cell protection control module 302 is further configured to:
when a target cell exists, collecting a voltage value of a voltage stabilizing module in the cut-in type constant voltage protection device connected in parallel with the target cell, and judging whether the voltage value of the voltage stabilizing module meets a preset voltage condition; when the voltage value of the voltage stabilizing module is judged not to meet the preset voltage condition, the voltage value of the voltage stabilizing module in the cut-in type constant voltage protection device which is connected with the target battery cell in parallel is triggered and regulated, so that the voltage value of the voltage stabilizing module meets the operation of the preset voltage condition.
It can be seen that this alternative embodiment can also determine the voltage value of the voltage stabilizing module 101 before adjusting the voltage value of the voltage stabilizing module, which is beneficial to reducing unnecessary voltage value adjustment operations.
In yet another alternative embodiment, the cell protection control module 302 is further configured to:
when the target battery core exists and the voltage value of the voltage stabilizing module is judged to meet the preset voltage condition, a cut-in instruction is sent to the cut-in type constant voltage protection device connected with the target battery core in parallel, and the cut-in instruction is used for indicating that the voltage stabilizing module in the cut-in type constant voltage protection device connected with the target battery core in parallel currently meets the loop cut-in condition.
Further, when the target battery cell exists, the battery cell protection control module 302 cuts in the voltage stabilizing module in the cut-in type constant voltage protection device connected in parallel with the target battery cell, and a specific mode of cutting in a loop where the target battery cell is located includes:
and detecting whether a loop cut-in instruction exists, and cutting in a voltage stabilizing module in the cut-in type constant voltage protection device connected in parallel with the target cell into a loop where the target cell is located when the loop cut-in instruction exists, wherein the loop cut-in instruction is generated according to the cut-in instruction.
Therefore, the alternative embodiment not only can realize intelligent control of switching in the voltage stabilizing module to the cell loop through the loop switching-in instruction, and is beneficial to improving the switching-in control accuracy of the voltage stabilizing module, but also can ensure that the voltage stabilizing module is controlled to switch in when the voltage value of the voltage stabilizing module meets the preset voltage requirement, thereby ensuring zero-differential switching and no switching stress.
Example IV
Referring to fig. 6, fig. 6 is a schematic diagram of a control device of another cut-in constant voltage protection circuit according to an embodiment of the invention. The control device described in fig. 6 is used to control the cut-in constant voltage protection circuit, and the cut-in constant voltage protection circuit may be any of the cut-in constant voltage protection circuits described in the first embodiment. As shown in fig. 6, the control device includes:
a memory 401 storing executable program codes;
a processor 402 coupled with the memory 401;
the processor 402 calls executable program codes stored in the memory 401 to execute part or all of the steps of the control method of the cut-in type constant voltage protection circuit described in any one of the second embodiments.
Example five
The embodiment of the invention discloses a computer storage medium which stores computer instructions, wherein the computer instructions are used for executing part or all of the steps of the control method of the cut-in type constant voltage protection circuit described in any one of the second embodiment when being called.
The embodiments of the apparatus, cut-in constant voltage protection circuit described above are illustrative only, in that the modules illustrated as separate components may or may not be physically separate, and the components shown as modules may or may not be physical modules, i.e., may be located in one place, or may be distributed across multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above detailed description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course by means of hardware. Based on such understanding, the foregoing technical solutions may be embodied essentially or in part in the form of a software product that may be stored in a computer-readable storage medium including Read-Only Memory (ROM), random-access Memory (Random Access Memory, RAM), programmable Read-Only Memory (Programmable Read-Only Memory, PROM), erasable programmable Read-Only Memory (Erasable Programmable Read Only Memory, EPROM), one-time programmable Read-Only Memory (OTPROM), electrically erasable programmable Read-Only Memory (EEPROM), compact disc Read-Only Memory (Compact Disc Read-Only Memory, CD-ROM) or other optical disc Memory, magnetic disc Memory, tape Memory, or any other medium that can be used for computer-readable carrying or storing data.
Finally, it should be noted that: the embodiment of the invention discloses a cut-in constant voltage protection circuit, a control method, a control device and a computer storage medium, which are only disclosed as the preferred embodiment of the invention, and are only used for illustrating the technical scheme of the invention, but not limiting the technical scheme; although the invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand that; the technical scheme recorded in the various embodiments can be modified or part of technical features in the technical scheme can be replaced equivalently; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.

Claims (11)

1. The cut-in constant voltage protection circuit is characterized by being applied to formation/capacity-division equipment in a power battery automatic production line, wherein the formation/capacity-division equipment is used for carrying out formation/capacity division on a plurality of battery cores connected in series through a constant current/constant voltage source module;
the cut-in constant voltage protection circuit includes: at least one cut-in constant voltage protection device; each cut-in type constant voltage protection device is connected with the corresponding battery cell in parallel respectively, and the cut-in type constant voltage protection device comprises: the device comprises a voltage detection control module, a voltage stabilizing module and a cut-in module, wherein the voltage stabilizing module and the cut-in module are connected in series; the voltage detection control module is electrically connected with the voltage stabilizing module in the cut-in constant voltage protection device;
For any one of the cut-in constant voltage protection devices, the cut-in module is configured to:
when a target cell connected in parallel with the cut-in constant voltage protection device enters a predetermined constant voltage protection state, cutting in the voltage stabilizing module connected in series with the cut-in module into a loop where the target cell is located;
the voltage detection control module is used for:
when the target battery core enters the constant voltage protection state, adjusting the voltage value of the voltage stabilizing module electrically connected with the voltage detection control module so that the voltage value of the voltage stabilizing module electrically connected with the voltage detection control module meets a preset voltage condition;
after the voltage stabilizing module connected in series with the switching-in module is switched into a loop where the target battery cell is located, the voltage value of the voltage stabilizing module needs to meet the preset voltage condition, the current output by the constant current/constant voltage source module is zero, the current output by the constant current/constant voltage source module is bypassed by the voltage stabilizing module and then continuously flows into other battery cells which do not enter the constant voltage protection state at present, so that the other battery cells continue to perform the current process flow; the zero current flowing through the target cell comprises: the current into the target cell is zero and the current out of the target cell is zero.
2. The cut-in constant voltage protection circuit according to claim 1, wherein the voltage value satisfying the preset voltage condition comprises: the voltage value is equal to the current voltage value of the target battery cell;
and, the hand-in module is further configured to:
when all the series-connected battery cells need to enter the next process flow, the voltage stabilizing module connected in series with the cut-in module is controlled to be disconnected from the loop where the target battery cell is located, so that the target battery cell and the other battery cells synchronously enter a new process flow.
3. The cut-in constant voltage protection circuit according to claim 2, wherein the cut-in module comprises a control switch;
the first end of the control switch is used for being electrically connected with the positive electrode of the target battery cell, the second end of the control switch is electrically connected with the first end of the voltage stabilizing module, and the second end of the voltage stabilizing module is used for being electrically connected with the negative electrode of the target battery cell;
when the voltage stabilizing module cuts into a loop where the target battery cell is located, the voltage of the second end of the voltage stabilizing module is lower than that of the first end of the voltage stabilizing module.
4. A cut-in constant voltage protection circuit according to any one of claims 1-3, wherein said voltage detection control module is further configured to:
When the corresponding target battery cell enters the constant voltage protection state, collecting a voltage value of the voltage stabilizing module electrically connected with the voltage detection control module, and judging whether the voltage value of the voltage stabilizing module electrically connected with the voltage detection control module meets the preset voltage condition; when the voltage value of the voltage stabilizing module electrically connected with the voltage detection control module is judged not to meet the preset voltage condition, triggering and executing the operation of adjusting the voltage value of the voltage stabilizing module electrically connected with the voltage detection control module so that the voltage value of the voltage stabilizing module electrically connected with the voltage detection control module meets the preset voltage condition; the method comprises the steps of,
when the voltage value of the voltage stabilizing module electrically connected with the voltage detection control module meets the preset voltage condition, a cut-in instruction is sent to the cut-in module or a control system of the formation/capacity-division equipment, and the cut-in instruction is used for indicating that the voltage stabilizing module electrically connected with the voltage detection control module currently meets a loop cut-in condition.
5. The cut-in constant voltage protection circuit according to claim 4, wherein the specific manner in which the cut-in module cuts in the voltage stabilizing module connected in series with the cut-in module and having a voltage value satisfying a preset voltage condition into the loop in which the target cell is located includes:
And detecting whether a loop cut-in instruction exists, and when the loop cut-in instruction exists, cutting in the voltage stabilizing module connected in series with the cut-in module into a loop where the target battery cell is located, wherein the loop cut-in instruction is generated according to the cut-in instruction.
6. The cut-in constant voltage protection circuit according to claim 5, wherein the total number of all the cut-in constant voltage protection devices is the same as the total number of all the cells connected in series, and one of the cut-in constant voltage protection devices is connected in parallel to one of the cells.
7. The cut-in constant voltage protection circuit according to claim 1, wherein the target cell connected in parallel with the cut-in constant voltage protection device enters the constant voltage protection state, comprising:
in a constant voltage charge/discharge mode, the target cell connected in parallel with the cut-in constant voltage protection device enters the constant voltage protection state; or alternatively, the process may be performed,
and under a constant-current charge/discharge mode, the target battery cell connected in parallel with the cut-in constant-voltage protection device enters the constant-voltage protection state.
8. A control method of a cut-in type constant voltage protection circuit, characterized in that the cut-in type constant voltage protection circuit includes the cut-in type constant voltage protection circuit according to any one of claims 1 to 7, the method comprising:
Judging whether target cells entering a predetermined constant voltage protection state exist in all the cells connected in series;
when the target battery core exists, a voltage stabilizing module in a cut-in type constant voltage protection device connected in parallel with the target battery core is cut into a loop where the target battery core is located; when the target battery core exists, adjusting a voltage value of a voltage stabilizing module in the cut-in type constant voltage protection device connected in parallel with the target battery core so that the voltage value of the voltage stabilizing module meets a preset voltage condition;
after the voltage stabilizing module cuts into a loop where the target battery cell is located, the voltage value of the voltage stabilizing module needs to meet the preset voltage condition, and current output by a constant current/constant voltage source module for providing current for formation/capacity division of all the battery cells is zero, and current output by the constant current/constant voltage source module is bypassed by the voltage stabilizing module and then continuously flows into other battery cells which do not enter the constant voltage protection state at present, so that the other battery cells continue to perform the current process flow; the zero current flowing through the target cell comprises: the current into the target cell is zero and the current out of the target cell is zero.
9. The control method of the cut-in constant voltage protection circuit according to claim 8, further comprising:
when all the series-connected battery cells need to enter the next process flow, the loop where the voltage stabilizing module and the target battery cell are located is controlled to be disconnected, so that the target battery cell and the other battery cells synchronously enter a new process flow.
10. A control device of a cut-in type constant voltage protection circuit, characterized in that the cut-in type constant voltage protection circuit includes the cut-in type constant voltage protection circuit according to any one of claims 1 to 7, the device comprising:
the judging module is used for judging whether target cells entering a predetermined constant voltage protection state exist in all the cells connected in series;
the battery cell protection control module is used for switching in a voltage stabilizing module in the cut-in type constant voltage protection device connected in parallel with the target battery cell into a loop where the target battery cell is located when the judging module judges that the target battery cell exists; when the judging module judges that the target battery core exists, the voltage value of the voltage stabilizing module in the cut-in type constant voltage protection device connected in parallel with the target battery core is adjusted so that the voltage value of the voltage stabilizing module meets a preset voltage condition;
After the voltage stabilizing module cuts into a loop where the target battery cell is located, the voltage value of the voltage stabilizing module needs to meet the preset voltage condition, and current output by a constant current/constant voltage source module for providing current for formation/capacity division of all the battery cells is zero, and current output by the constant current/constant voltage source module is bypassed by the voltage stabilizing module and then continuously flows into other battery cells which do not enter the constant voltage protection state at present, so that the other battery cells continue to perform the current process flow; the zero current flowing through the target cell comprises: the current into the target cell is zero and the current out of the target cell is zero.
11. A computer storage medium storing computer instructions for executing part or all of the steps in the control method of the cut-in type constant voltage protection circuit according to claim 8 or 9 when called.
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