CN116231816A - Cut-in constant voltage protection circuit, control method, device and computer storage medium - Google Patents

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 separation equipment for forming/dividing multiple series batteries. A cut-in constant voltage protection device with cells connected in parallel, the device includes a voltage stabilization module and a cut-in module connected in series; the cut-in module is used for: when the battery cells connected in parallel with the corresponding cut-in constant voltage protection device enter the constant voltage protection state , cut the voltage stabilizing module into the cell circuit, the voltage value of the voltage stabilizing module must meet the preset voltage condition after cutting in, so that the current flowing through the cell is zero, and the output of the constant current/constant voltage source module After the current is bypassed by the voltage stabilizing module, it continues to flow to other cells. It can be seen that the present invention can effectively realize that the cell that triggers the protection condition enters the protection state, reduces the occurrence of damage to the cell and does not affect other cells to continue to complete the work step, and improves the execution efficiency of the work step process.

Description

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

technical field

The invention relates to the technical field of power battery automatic production line, in particular to a cut-in constant voltage protection circuit, a control method, a device and a computer storage medium.

Background technique

With the application of automatic power battery production lines, how to improve the efficiency of formation and capacity separation is becoming more and more important. In practical applications, the lithium battery cell must be charged and activated after assembly, and the first charging process of the cell is called formation, which is used to activate the active material in the cell and generate an SEI film (ie: Solid Electrolyte Interface, solid electrolyte interface membrane). After the battery cells are formed, they need to be divided into capacity. The capacity division is to charge and discharge the formed batteries to test the performance of the batteries, so as to facilitate the classification and grouping of the batteries according to the capacity.

The series formation and volume separation technology is a commonly used high-efficiency mode at present. In order to reduce the occurrence of battery cells being damaged due to overcharging or over-discharging during the process of formation and capacity separation, and even causing safety accidents such as fire, a first current path and In the second current path (as shown in Figure 1), the current in the first current path will flow to the battery core, while the current in the second current path will bypass the battery core, that is, the bypass. As shown in Figure 1, a switch is provided on the first current path and the second current path respectively, so that the first current can be turned on or off through the switch on the first current path during the process of cell forming and capacity dividing. The path and the switch on the second current path bypass the first current path, so that the current of the original first current path is bypassed through the second current path.

When a battery cell in the series circuit enters the constant voltage CV protection state of formation and capacity division, the first current path is disconnected through the switch on the first current path and the second current is turned on through the switch on the second current path. path, so as to avoid the current flowing into the cell.

For example: if the cell A1 in Figure 1 reaches the constant voltage protection point first, K1 is disconnected and K1' is closed at the same time, the current is bypassed, and the current bypasses the cell A1, while other cells are not affected, and the current process continues working step process.

However, it has been found through practice that when the existing related technologies such as those shown in Figure 1 are used to form and divide the battery cells, due to factors such as the action sequence of K1 and K1' and the cleanliness of the action, the battery cells may be damaged. , At the same time, it will also cause a sudden change in voltage and current, which will trigger the protection of the working step. In addition, when a large current flows, K1 and K1' in the circuit will bring additional power consumption and reduce power consumption efficiency.

Contents of the invention

The invention provides a cut-in constant voltage protection circuit, a control method, a device, and a computer storage medium, which can effectively reduce damage to electric cores, and can also help improve energy utilization efficiency.

The first aspect of the present invention discloses a cut-in constant voltage protection circuit. The cut-in constant voltage protection circuit is applied to the formation/capacity separation equipment in the automatic power battery production line. The formation/capacity separation equipment is used to pass constant The current/constant voltage source module performs formation/division of multiple batteries connected in series;

The cut-in constant voltage protection circuit includes: at least one cut-in constant voltage protection device; each of the cut-in constant voltage protection devices is connected in parallel with the corresponding cell, and the cut-in constant voltage protection device includes: series connection voltage stabilizing module and cut-in module;

For any of the cut-in constant voltage protective devices, the cut-in module is used for:

When the target cell connected in parallel with the cut-in constant voltage protection device enters a predetermined constant voltage protection state, the voltage stabilizing module connected in series with the cut-in module will be cut in to the cell where the target cell is located. in the loop;

Wherein, after the voltage stabilizing module connected in series with the cut-in module is cut into the circuit where the target cell is located, the voltage value of the voltage stabilizing module needs to meet a preset voltage condition, and the constant current/constant The current output by the voltage source module, the current flowing through the target cell is zero, and the current output by the constant current/constant voltage source module, after being bypassed by the voltage stabilization module, continues to flow to the current non-entering Among the other batteries in the constant voltage protection state, so that the other batteries continue the current working process; the current flowing through the target battery is zero includes: the current entering the target battery is zero And the current flowing 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 cell;

And, the cut-in module is also used for:

When all the battery cells connected in series need to enter the next process step, control the voltage stabilizing module connected in series with the cut-in module to disconnect from the circuit where the target battery cells are located, so that the target battery cells The core enters into a new process step synchronously with the other cells.

As an optional implementation manner, 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 to electrically connect the positive pole of the target cell, the second end of the control switch is electrically connected to the first end of the voltage stabilizing module, and the second end of the voltage stabilizing module is used for for electrically connecting the negative electrode of the target cell;

Wherein, when the voltage stabilizing module is switched into the circuit where the target cell is located, the voltage at the second end of the voltage stabilizing module is lower than the voltage at the first end of the voltage stabilizing module.

As an optional implementation, in the first aspect of the present invention, the cut-in constant pressure protection device further includes:

A voltage detection control module, the voltage detection control module is electrically connected to the voltage stabilizing module in the cut-in constant voltage protection device;

Wherein, the voltage detection control module is used for:

When the corresponding cell enters the constant voltage protection state, adjust the voltage value of the voltage stabilization module electrically connected to the voltage detection control module, so that the voltage stabilization module electrically connected to the voltage detection control module The voltage value of the module satisfies the preset voltage condition.

As an optional implementation manner, in the first aspect of the present invention, the voltage detection control module is also used for:

When the corresponding cell enters the constant voltage protection state, collect the voltage value of the voltage stabilizing module electrically connected to the voltage detection control module, and determine the voltage stabilizing module electrically connected to the voltage detection control module Whether the voltage value of the voltage value meets the preset voltage condition; when it is judged that the voltage value of the voltage stabilization module electrically connected to the voltage detection control module does not meet the preset voltage condition, triggering the execution of the adjustment and The voltage value of the voltage stabilizing module electrically connected to the voltage detection control module, so that the voltage value of the voltage stabilizing module electrically connected to the voltage detection control module satisfies the operation of the preset voltage condition; and,

When the voltage value of the voltage stabilizing module electrically connected to the voltage detection control module satisfies the preset voltage condition, a cut-in instruction is sent to the control system of the cut-in module or the formation/capacity separation device, the The cut-in indication is used to indicate that the voltage stabilizing module electrically connected to the voltage detection control module currently satisfies a loop cut-in condition.

As an optional implementation, in the first aspect of the present invention, the cut-in module switches the voltage stabilizing module connected in series with the cut-in module and whose voltage value satisfies a preset voltage condition to the target cell The specific methods in the loop include:

Detecting whether there is a circuit cut-in instruction, and when it is detected that the circuit cut-in instruction exists, cut the voltage stabilizing module connected in series with the cut-in module into the loop where the target cell is located, wherein the loop cut-in An instruction is generated based on the cutin instruction.

As an optional implementation, in the first aspect of the present invention, the total number of all the cut-in constant voltage protection devices is the same as the total number of all the battery cells connected in series, and one cut-in constant voltage protection device The voltage protection device is connected in parallel with 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 the constant voltage charging/discharging mode, the target cell connected in parallel with the cut-in constant voltage protection device enters the constant voltage protection state; or,

In the constant current charging/discharging mode, the target 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 for a cut-in constant voltage protection circuit. The cut-in constant voltage protection circuit includes the cut-in constant voltage protection circuit described in any one of the first aspects of the present invention. The method includes:

Judging whether there is a target cell entering a predetermined constant voltage protection state among all the cells connected in series;

When the target battery cell exists, switch the voltage stabilizing module in the cut-in constant voltage protection device connected in parallel with the target battery cell into the circuit where the target battery cell is located;

Wherein, after the voltage stabilizing module cuts into the circuit where the target cell is located, the voltage value of the voltage stabilizing module needs to meet the preset voltage condition, and provide a constant current for all the cells to be formed/divided The current output by the 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 continues to flow to the current In other cells that have not entered the constant voltage protection state, so that the other cells continue the current working process; the current flowing through the target cell is zero includes: the current entering the target cell is zero and the current flowing out of the target cell is zero.

As an optional implementation manner, in the second aspect of the present invention, the method further includes:

When all the battery cells connected in series need to enter the next process step, control the voltage stabilizing module to disconnect the circuit where the target battery cell is located, so that the target battery cell is synchronized with the other battery cells Enter a new working step process.

As an optional implementation manner, in the second aspect of the present invention, the method further includes:

When the target cell exists, adjust the voltage value of the voltage stabilizing module in the cut-in constant voltage protection device connected in parallel with the target cell, so that the voltage value of the voltage stabilizing module satisfies the preset voltage condition.

As an optional implementation manner, in the second aspect of the present invention, the method further includes:

When the target cell exists, collect the voltage value of the voltage stabilizing module in the cut-in constant voltage protection device connected in parallel with the target cell, and judge whether the voltage value of the voltage stabilizing module satisfies a preset voltage condition; When it is judged that the voltage value of the voltage stabilizing module does not meet the preset voltage condition, triggering the execution of the adjustment of the voltage value of the voltage stabilizing module in the cut-in constant voltage protection device connected in parallel with the target cell to make the voltage value of the voltage stabilizing module meet the operation of the preset voltage condition;

And, when it is judged that the voltage value of the voltage stabilizing module satisfies the preset voltage condition, a cut-in instruction is sent to the cut-in constant voltage protection device connected in parallel with the target cell, and the cut-in instruction is used to indicate the The voltage stabilizing module in the cut-in constant voltage protection device with the target cells connected in parallel currently satisfies a circuit cut-in condition.

As an optional implementation, in the second aspect of the present invention, when the target battery exists, the voltage stabilizing module in the cut-in constant voltage protection device connected in parallel with the target battery is cut in The circuit where the target cell is located includes:

When the target battery cell exists, detect whether there is a circuit cut-in command, and when it is detected that the circuit cut-in command exists, switch the voltage stabilizing module in the cut-in constant voltage protection device connected in parallel with the target battery cell to the The loop where the target cell is located, wherein the loop cut-in instruction is generated according to the cut-in instruction.

The 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 includes the cut-in constant voltage protection circuit described in any one of the first aspects of the present invention. The device includes:

A judging module, configured to judge whether there is a target cell entering a predetermined constant voltage protection state among all the cells connected in series;

A cell protection control module, configured to switch the voltage stabilizing module in the cut-in constant voltage protection device connected in parallel with the target cell into the target cell when the judging module determines that the target cell exists the circuit in which

Wherein, after the voltage stabilizing module cuts into the circuit where the target cell is located, the voltage value of the voltage stabilizing module needs to meet the preset voltage condition, and provide a constant current for all the cells to be formed/divided The current output by the 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 continues to flow to the current In other cells that have not entered the constant voltage protection state, so that the other cells continue the current working process; the current flowing through the target cell is zero includes: the current entering the target cell is zero and the current flowing out of the target cell is zero.

As an optional implementation, in the third aspect of the present invention, the cell protection control module is also used for:

When all the battery cells connected in series need to enter the next process step, control the voltage stabilizing module to disconnect the circuit where the target battery cell is located, so that the target battery cell is synchronized with the other battery cells Enter a new working step process.

As an optional implementation, in the third aspect of the present invention, the cell protection control module is also used for:

When the target cell exists, adjust the voltage value of the voltage stabilizing module in the cut-in constant voltage protection device connected in parallel with the target cell, so that the voltage value of the voltage stabilizing module satisfies the preset voltage condition.

As an optional implementation, in the third aspect of the present invention, the cell protection control module is also used for:

When the target cell exists, collect the voltage value of the voltage stabilizing module in the cut-in constant voltage protection device connected in parallel with the target cell, and judge whether the voltage value of the voltage stabilizing module satisfies a preset voltage condition; When it is judged that the voltage value of the voltage stabilizing module does not meet the preset voltage condition, triggering the execution of the adjustment of the voltage value of the voltage stabilizing module in the cut-in constant voltage protection device connected in parallel with the target cell to make the voltage value of the voltage stabilizing module meet the operation of the preset voltage condition;

And, when it is judged that the voltage value of the voltage stabilizing module satisfies the preset voltage condition, a cut-in instruction is sent to the cut-in constant voltage protection device connected in parallel with the target cell, and the cut-in instruction is used to indicate the The voltage stabilizing module in the cut-in constant voltage protection device with the target cells connected in parallel currently satisfies a circuit cut-in condition.

As an optional implementation manner, in the third aspect of the present invention, when the target cell exists, the cell protection control module puts The specific ways for the voltage stabilizing module to cut into the circuit where the target cell is located include:

Detecting whether there is a circuit cut-in instruction, and when detecting the presence of the circuit cut-in instruction, switching the voltage stabilizing module in the cut-in constant voltage protection device connected in parallel with the target battery cell to the circuit where the target battery cell is located, wherein , the loop cut-in instruction is generated according to the cut-in instruction.

The fourth aspect of the present invention discloses another control device for a cut-in constant voltage protection circuit, the cut-in constant voltage protection circuit includes the cut-in constant voltage protection circuit described in any one of the first aspects of the present invention, and the device includes :

a memory storing executable program code;

a processor coupled to the memory;

The processor invokes the executable program code stored in the memory to execute some or all of the steps of any one of the control methods for the cut-in constant voltage protection circuit described in the second aspect of the present invention.

The fifth aspect of the present invention discloses a computer storage medium, the computer storage medium stores computer instructions, and when the computer instructions are called, it is used to execute the cut-in constant voltage protection circuit described in any one of the second aspect of the present invention Some or all steps of the control method.

Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

In the present invention, a plurality of series-connected battery cells that need to be formed/divided can be connected in parallel with the corresponding cut-in constant voltage protection device, and the cut-in constant voltage protection device includes a series-connected voltage stabilization module and a cut-in module. When the cell enters the constant voltage protection state, the voltage stabilization module whose voltage value meets the preset voltage condition is cut into the circuit where the cell is located, so that the current output by the constant current/constant voltage source module flows through the cell to zero (that is, 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, after being bypassed by the voltage regulator module, continues to flow to the In other batteries in the voltage protection state, so that other batteries continue to carry out the current process, so that the battery cells that trigger the protection conditions can be effectively entered into the protection state, reducing the damage to the battery cells without affecting other batteries Continue to complete the work steps to improve the execution efficiency of the work step process;

Furthermore, when the cell enters the constant voltage protection state, the protection voltage of the cell is equal to the voltage of the voltage stabilizing module, and the switch cut into the module can achieve zero-voltage switching without switching stress;

Furthermore, in the battery cell series circuit, there is no sudden change in current or voltage, and smooth switching is achieved without stress, which can effectively reduce the protection of working steps caused by sudden changes in voltage and current;

Furthermore, the cut-in module (such as a control switch) is cut in only when the constant voltage protection is activated, and it is not in the normal work step execution circuit before cut-in, that is, no current flows through the cut-in module (such as a control switch) before cut-in, and there is no loss. It is conducive to improving energy utilization efficiency.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

Fig. 1 is a structural schematic diagram of a cell protection circuit disclosed in the prior art;

Fig. 2 is a schematic structural diagram of a cut-in constant voltage protection circuit disclosed in an embodiment of the present invention;

Fig. 3 is a schematic structural diagram of a cut-in constant voltage protection circuit used for cell protection in constant current charging/discharging mode disclosed in an embodiment of the present invention;

Fig. 4 is a schematic flowchart of a control method of a cut-in constant voltage protection circuit disclosed in an embodiment of the present invention;

5 is a schematic structural diagram of a control device for a cut-in constant voltage protection circuit disclosed in an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of another control device for a cut-in constant voltage protection circuit disclosed in an embodiment of the present invention.

Detailed ways

In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

The terms "first", "second" and the like in the description and claims of the present invention and the above drawings are used to distinguish different objects, rather than to describe a specific order. Furthermore, the terms "include" and "have", as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, device, product, or terminal comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally further includes For other steps or units inherent in these processes, methods, products or ends.

Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present invention. The occurrences of this phrase 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. It is understood explicitly and implicitly by those skilled in the art that the embodiments described herein can be combined with other embodiments.

The invention discloses a cut-in constant voltage protection circuit and its control method and device, which can effectively realize that the cell that triggers the protection condition enters the protection state, reduces the occurrence of damage to the cell and does not affect other cells to continue to complete the working steps , improve the execution efficiency of the working step process; further, when the cell enters the constant voltage protection state, the protection voltage of the cell is equal to the voltage of the voltage stabilizing module, and the switch cut into the module can achieve zero-voltage switching without switching Stress; further, in the battery series circuit, there is no sudden change in current or voltage, and smooth switching is achieved without stress, which can effectively reduce the working step protection caused by sudden changes in voltage and current; further, cut-in modules (such as control switches ) is cut in only when the constant voltage protection is started, and it is not in the normal working step execution circuit before cut in, that is, no current flows through the cut in module (such as a control switch) before cut in, and there is no loss, which is conducive to improving energy utilization efficiency. What needs to be specially explained is that in the steps of series formation/capacity division, such as constant current charge/discharge, constant voltage charge/discharge, etc., all cells can be effectively protected by the cut-in protection mode of the present invention. Each will be described in detail below.

Embodiment one

Please refer to FIG. 2 . FIG. 2 is a schematic structural diagram of a cut-in constant voltage protection circuit disclosed by an embodiment of the present invention. Among them, the cut-in constant voltage protection circuit described in Figure 2 is applied to the formation/capacity separation equipment in the automatic production line of power batteries. The formation/capacity separation equipment is used for multiple The cells are formed/divided. Specifically, as shown in Figure 2, the cut-in 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 the corresponding cell, and the cut-in constant voltage protection device 10 includes: a voltage stabilizing module 101 and a cut-in module 102 connected in series.

For any cut-in constant voltage protection device 10, the cut-in module 102 it includes is used 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 where the target cell is located.

Among them, after the voltage stabilizing module 101 connected in series with the cut-in module 102 and whose voltage value satisfies the preset voltage condition is cut into the circuit where the target cell is located, the voltage value of the voltage stabilizing module needs to meet the preset voltage condition, constant current/constant The current output by the voltage source module, the current flowing through the target cell is zero, and the current output by the constant current/constant voltage source module, after being bypassed by the voltage stabilization module, continues to flow to other cells that are not currently in the constant voltage protection state. In the battery, so that other batteries continue to carry out the current process. Specifically, the current flowing through the target cell is zero includes: the current entering the target cell is zero and the current flowing out of the target cell is zero.

Optionally, the target cell may enter the constant voltage protection state in the constant current charging/discharging mode, or enter the constant voltage protection state in the constant voltage charging/discharging mode, which is not limited in this embodiment of the present invention.

It should be noted that in practical applications, the adjustment of the voltage value of the voltage stabilizing module 101 and the cut-in of the voltage stabilizing module 101 can be carried out simultaneously, or the voltage value can be adjusted first and then cut into the circuit where the battery cell is located, or it can be cut in first Go to the circuit where the battery cell is located and adjust the voltage value. Preferably, the voltage value is adjusted first and then switched to the circuit where the battery core is located, which is beneficial to further ensure zero-voltage-difference switching without switching stress.

It can be seen that the implementation of the cut-in constant voltage protection circuit described in Figure 2 can effectively realize the cell that triggers the protection condition to enter the protection state, reduce the damage to the cell without affecting other cells to continue to complete the work step, and improve the process flow execution efficiency; further, the cut-in module 102 only cuts in when the constant voltage protection is started, and is not in the normal working step execution circuit before the cut-in, that is, no current flows through the cut-in module 102 before the cut-in, and there is no loss, which is beneficial to improve energy usage efficiency.

In an optional 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 cell, or the voltage value of the voltage stabilizing module 101 is equal to the target The absolute value of the voltage difference of the current voltage value of the cell is less than or equal to the preset voltage threshold.

In this optional embodiment, the voltage value satisfying the preset voltage condition is preferably the former, 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 of the target cell value, so that when the cell enters the constant voltage protection state, the protection voltage of the cell is equal to the voltage of the voltage stabilizing module, and the control switch cut into the module 102 can achieve zero-voltage switching without switching stress.

In another optional embodiment, the cut-in module 102 can also be used for:

When all the battery cells connected in series need to enter the next process step, the control module 101 connected in series with the cut-in module 102 is disconnected from the circuit where the target battery cell is located, so that the target battery cell and other battery cells enter the new process synchronously. working step process.

It can be seen that this optional embodiment can also disconnect the voltage stabilizing module 101 from the circuit where the corresponding battery cell is located when the current process step ends and a new process step needs to be entered after the cell triggers the constant voltage protection, so as to Ensure that all batteries enter the new working step process synchronously, thereby ensuring the normal progress of the working step process.

In yet another optional embodiment, as shown in FIG. 2, the cut-in module 102 may specifically include a control switch, wherein:

The first end of the control switch is used to electrically connect the positive pole of the target cell, the second end of the control switch is electrically connected to the first end of the voltage stabilizing module 101, and the second end of the voltage stabilizing module 101 is used to electrically connect the negative pole of the target cell ;

And, when the voltage stabilizing module 101 is switched into the loop where the target cell is located, the voltage at the second end of the voltage stabilizing module 101 is lower than the voltage at the first end of the voltage stabilizing module 101 .

It can be seen that this optional embodiment can switch the voltage stabilizing module 101 into the circuit where the corresponding cell is located or disconnect it from the circuit where the corresponding cell is located by controlling the switch, which is conducive to improving the control efficiency and convenience of switching in or disconnecting the voltage stabilizing module. sex, and low cost.

In yet another optional embodiment, the cut-in constant voltage protection device 10 further includes:

A voltage detection control module 103, the voltage detection control module 103 is electrically connected to 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 cell enters the constant voltage protection state, adjust the voltage value of the voltage stabilizing module 101 electrically connected to the voltage detection control module 103, so that the voltage value of the voltage stabilizing module 101 electrically connected to the voltage detection control module 103 meets the predetermined value. A voltage condition is set (for example, the voltage value of the voltage stabilizing module 101 is equal to the current voltage value of the corresponding cell).

Further optionally, the voltage detection control module 103 can also be used for electrical connection with the corresponding battery cell, so that based on the voltage detection control module 103, the collection of the current voltage value of the battery cell and the adjustment of the voltage value of the voltage stabilization module 101 can be realized. It is beneficial to improve the adjustment efficiency and adjustment accuracy of the voltage value of the voltage stabilizing module 101 .

Further optionally, the voltage detection control module 103 is also used for:

When the corresponding cell enters the constant voltage protection state, collect the voltage value of the voltage stabilizing module 101 electrically connected to the voltage detection control module 103, and judge whether the voltage value of the voltage stabilizing module 101 electrically connected to the voltage detection control module 103 meets the predetermined value. Set the voltage condition; when it is judged that the voltage value of the voltage stabilizing module 101 electrically connected to the voltage detection control module 103 does not meet the preset voltage condition, trigger the execution of the above-mentioned adjustment of the voltage stabilizing module 101 electrically connected to the voltage detection control module 103 The voltage value, so that the voltage value of the voltage stabilizing module 101 electrically connected to the voltage detection control module 103 satisfies a preset voltage condition.

It can be seen that this optional embodiment can also judge the voltage value of the voltage stabilizing module 101 before adjusting the voltage value of the voltage stabilizing module 101 , which is beneficial to reduce unnecessary voltage value adjustment operations.

Still further, the voltage detection control module 103 is also used for:

When the corresponding battery cell enters the constant voltage protection state and when the voltage value of the voltage stabilization module 101 electrically connected to the voltage detection control module 103 meets the preset voltage condition, the control system of the cut-in module 102 or the formation/capacity division equipment (such as the bit computer, etc.) to send a cut-in indication, which is used to indicate that the voltage stabilizing module 101 electrically connected to the voltage detection control module 103 currently satisfies the loop cut-in condition.

It can be seen that this optional embodiment can also generate a corresponding cut-in instruction when the voltage value of the voltage stabilizing module 101 electrically connected to the voltage detection control module 103 meets the preset voltage condition, which is conducive to improving the cut-in control of the voltage stabilizing module 101 accuracy, and can also ensure that the cut-in module 102 realizes zero-pressure-difference switching when the voltage-stabilizing module 101 is cut into the circuit where the cell is located, and there is no switching stress.

In yet another optional embodiment, when the target cell connected in parallel with the cut-in constant voltage protection device 10 enters a predetermined constant voltage protection state, the cut-in module 102 will be connected in series with the cut-in module 102 and the voltage value satisfies The voltage stabilizing module 101 of the preset voltage condition, the specific way of cutting into the circuit where the target cell is located may include:

Detect whether there is a circuit cut-in command, and when it is detected that there is a circuit cut-in command, switch the voltage stabilizing module 101 connected in series with the cut-in module 102 into the circuit where the target cell is located.

Optionally, the circuit cut-in instruction may be generated by the cut-in module 102, or sent by the control system (such as the intermediate computer, etc.) of the formation/capacity separation equipment, which is not limited in this embodiment of the present invention.

It can be seen that this optional embodiment can realize the loop cut-in control of the voltage stabilizing module 101 based on the loop cut-in command, which is beneficial to further improve the accuracy of the voltage stabilizing module 101 switching into the circuit where the battery cell is located.

Optionally, the total number of all cut-in constant voltage protection devices 10 is the same as the total number of all batteries connected in series, and one cut-in constant voltage protection device 10 is connected to one battery cell in parallel, that is: all batteries connected in series Each battery cell in the core is connected in parallel with a cut-in constant voltage protection device 10 to realize the cut-in constant voltage protection when all the batteries enter the constant voltage protection state.

Optionally, when any function of any module in the voltage stabilizing module 101, the cut-in module 102 and the voltage detection control module 103 is implemented, it can be decided by the corresponding module itself, or it can be implemented in the control system (such as the middle computer, etc.) It is completed under the control of the system, for example, the central computer sends corresponding control instructions or corresponding instructions to the corresponding modules, which is not limited in the embodiment of the present invention.

It should be noted that in specific applications, the cut-in constant voltage protection circuit applied to the constant current charging mode of the battery can be applied to the constant current discharge of the battery as shown in 3-A in Figure 3. mode, the cut-in constant voltage protection circuit can be shown as 3-B in FIG. 3 . Among them, compared with 3-A, the current direction of the constant current source module in 3-B has changed, and the cut-in constant voltage protection circuit shown in the two has the same principle of constant voltage protection for the cell.

Take cell charging as an example: please refer to Figure 2, cell A1, cell A2, ..., cell An are connected in series, and cells A1~An in series start to form and divide at the same time. When the cell A1 first reaches the voltage regulation value V1 of the working step protection, K1 is closed, and the voltage regulation module DZ1 is cut into the loop. At the same time, the voltage detection control module adjusts the voltage of the voltage regulation module DZ1 to be equal to V1. At this time, the charging current flows into the circuit through DZ1. Cells A2...An, instead of flowing into cell A1, allow other cells connected in series to continue to complete the working steps. Moreover, there will be no current flowing out of the cell A1, and the cell A1 is protected by the constant voltage V1. When the formation/volume division enters the next working step, the corresponding K1 will be disconnected under the command of the control system (such as the central computer), so that all the cells in the series circuit will enter the new working step process. Wherein, the constant voltage protection process when the 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 will not be illustrated one by one.

Embodiment two

Please refer to FIG. 4 . FIG. 4 is a schematic flowchart of a control method for a cut-in constant voltage protection circuit disclosed in an embodiment of the present invention. Wherein, the method described in FIG. 4 is used to control the cut-in constant voltage protection circuit. Optionally, the cut-in constant voltage protection circuit can refer to any cut-in constant voltage protection circuit described in Embodiment 1. The embodiments of the present invention are not limited. As shown in Figure 4, the control method may include the following steps:

201. Judging whether there is a target cell entering a predetermined constant voltage protection state among all the cells connected in series;

202. When there is a target cell, switch the voltage stabilizing module in the cut-in constant voltage protection device connected in parallel with the target cell into the circuit where the target cell is located;

Among them, after the voltage stabilizing module is cut into the circuit where the target battery is located, the voltage value of the voltage stabilizing module needs to meet the preset voltage condition, and the output current of the constant current/constant voltage source module that provides current for all the cells to form/capacitate , the current flowing through the target cell is zero, and the current output by the constant current/constant voltage source module, after being bypassed by the voltage regulator module, continues to flow to other cells that are not currently in the constant voltage protection state, so that Other battery cells continue to carry out the current working procedure. Specifically, the current flowing through the target cell is zero includes: the current entering the target cell is zero and the current flowing 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 cell, or the voltage value of the voltage stabilizing module is equal to the current voltage value of the target cell The absolute value of the difference is less than or equal to the preset voltage threshold. In the embodiment of the present invention, the voltage value satisfying the preset voltage condition is preferably the former, that is, the voltage value of the voltage stabilizing module satisfies the preset voltage condition, preferably the voltage value of the voltage stabilizing module is equal to the current voltage value of the target cell, which can When the cell enters the constant voltage protection state, the protection voltage of the cell is equal to the voltage of the voltage stabilizing module, and the switch cut into the module can achieve zero-voltage switching without switching stress.

It can be seen that the implementation of the method described in Figure 4 can effectively realize that the cell that triggers the protection condition enters the protection state, reduces the occurrence of damage to the cell and does not affect other cells to continue to complete the work step, and improves the execution efficiency of the work step process; further Yes, the cut-in module is only cut in when the constant voltage protection is started, and it is not in the normal step execution circuit before cut-in, that is, no current flows through the cut-in module before cut-in, and there is no loss, which is conducive to improving energy utilization efficiency.

In an optional embodiment, as shown in Figure 4, the control method may also include:

203. When all the battery cells connected in series need to enter the next process step, the control voltage stabilizing module is disconnected from the circuit where the target battery cell is located, so that the target battery cell and other battery cells enter the new process step synchronously.

It can be seen that this optional embodiment can also disconnect the voltage stabilizing module from the circuit where the corresponding battery cell is located when the current working step process ends and a new working step process needs to be entered after the cell triggers the constant voltage protection, so as to ensure All batteries enter into the new process step synchronously, thus ensuring the normal progress of the process step.

In another optional embodiment, the control method may also include:

When there is a target cell, adjust the voltage value of the voltage stabilizing module in the cut-in constant voltage protection device connected in parallel with the target cell, 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 satisfies the preset voltage condition, the above-mentioned operation of switching the voltage stabilizing module into the circuit where the target cell is located is triggered.

It can be seen that this optional embodiment can also intelligently realize the adjustment of the voltage value of the voltage stabilizing module, which is conducive to improving the adjustment efficiency and accuracy of the voltage value of the voltage stabilizing module; in addition, the adjustment of the voltage value of the voltage stabilizing module meets the requirements Afterwards, the voltage stabilizing module is cut into the circuit where the corresponding cell is located, realizing zero pressure difference cut-in.

In yet another optional embodiment, the control method may also include:

When there is a target cell, collect the voltage value of the voltage stabilizing module in the cut-in constant voltage protection device connected in parallel with the target cell, and judge whether the voltage value of the voltage stabilizing module meets the preset voltage condition; when the voltage stabilizing module is judged When the voltage value does not meet the preset voltage condition, trigger the execution of the above adjustment to adjust the voltage value of the voltage stabilizing module in the cut-in constant voltage protection device connected in parallel with the target cell, so that the voltage value of the voltage stabilizing module meets the preset voltage Conditional operation.

It can be seen that this optional embodiment can also judge the voltage value of the voltage stabilizing module 101 before adjusting the voltage value of the voltage stabilizing module, which is beneficial to reduce unnecessary voltage value adjustment operations.

Further, the control method may also include:

When there is a target cell and it is judged that the voltage value of the voltage stabilizing module satisfies the preset voltage condition, a cut-in instruction is sent to the cut-in constant voltage protection device connected in parallel with the target cell. The voltage stabilizing modules in the parallel-connected cut-in constant voltage protection device currently meet the circuit cut-in condition.

It can be seen that this optional embodiment can also help improve the accuracy of cut-in control of the voltage stabilizing module, and can also ensure that the cut-in module realizes zero pressure difference switching when the voltage stabilizing module is cut into the circuit where the battery cell is located, and there is no switching stress.

Further, when there is a target cell, the above-mentioned voltage stabilizing module in the cut-in constant voltage protection device connected in parallel with the target cell cuts into the circuit where the target cell is located, including:

Detect whether there is a circuit cut-in command. When the circuit cut-in command is detected, the voltage stabilizing module in the cut-in constant voltage protection device connected in parallel with the target cell is cut into the circuit where the target cell is located. The circuit cut-in command is based on A cut-in instruction is generated.

It can be seen that this optional embodiment can not only realize the intelligent control of switching the voltage stabilizing module into the battery circuit through the loop switching command, but also control the switching of the voltage stabilizing module when the voltage value of the voltage stabilizing module meets the preset voltage requirements. , to ensure zero differential pressure switching, no switching stress.

It should be noted that: for other related detailed descriptions of the embodiments of the present invention, please refer to the related descriptions of Embodiment 1, and the embodiments of the present invention will not be repeated here.

Embodiment three

Please refer to FIG. 5 . FIG. 5 is a schematic structural diagram of a control device for a cut-in constant voltage protection circuit disclosed by an embodiment of the present invention. Wherein, 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 cut-in constant voltage protection circuit described in the first embodiment. As shown in Figure 5, the control device includes:

A judging module 301, configured to judge whether there is a target cell entering a predetermined constant voltage protection state among all the cells connected in series;

The cell protection control module 302 is used to switch the voltage stabilizing module in the cut-in constant voltage protection device connected in parallel with the target cell into the circuit where the target cell is located when the judging module 301 determines that there is a target cell .

Among them, after the voltage stabilizing module is cut into the circuit where the target battery is located, the voltage value of the voltage stabilizing module needs to meet the preset voltage condition, and the output current of the constant current/constant voltage source module that provides current for all the cells to form/capacitate , the current flowing through the target cell is zero, and the current output by the constant current/constant voltage source module, after being bypassed by the voltage regulator module, continues to flow to other cells that are not currently in the constant voltage protection state, so that Other battery cells continue to carry out the current working procedure. Specifically, the current flowing through the target cell is zero includes: the current entering the target cell is zero and the current flowing out of the target cell is zero.

It can be seen that the implementation of the control device described in Figure 5 can effectively realize that the cell that triggers the protection condition enters the protection state, reduces the occurrence of damage to the cell and does not affect other cells to continue to complete the work step, and improves the execution efficiency of the work step process; Furthermore, the cut-in module is only cut in when the constant voltage protection is activated, and it is not in the normal work step execution circuit before cut-in, that is, no current flows through the cut-in module before cut-in, and there is no loss, which is conducive to improving energy utilization efficiency.

In an optional embodiment, the cell protection control module 302 is also used for:

When all the cells connected in series need to enter the next process step, the control voltage stabilization module is disconnected from the circuit where the target cell is located, so that the target cell and other cells enter the new process step synchronously.

It can be seen that this optional embodiment can also disconnect the voltage stabilizing module from the circuit where the corresponding battery cell is located when the current working step process ends and a new working step process needs to be entered after the cell triggers the constant voltage protection, so as to ensure All batteries enter into the new process step synchronously, thus ensuring the normal progress of the process step.

In an optional embodiment, the cell protection control module 302 is also used for:

When there is a target cell, adjust the voltage value of the voltage stabilizing module in the cut-in constant voltage protection device connected in parallel with the target cell, 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 satisfies the preset voltage condition, the above-mentioned operation of switching the voltage stabilizing module into the circuit where the target cell is located is triggered.

It can be seen that this optional embodiment can also intelligently realize the adjustment of the voltage value of the voltage stabilizing module, which is conducive to improving the adjustment efficiency and accuracy of the voltage value of the voltage stabilizing module; in addition, the adjustment of the voltage value of the voltage stabilizing module meets the requirements Afterwards, the voltage stabilizing module is cut into the circuit where the corresponding cell is located, realizing zero pressure difference cut-in.

In yet another optional embodiment, the cell protection control module 302 is also used for:

When there is a target cell, collect the voltage value of the voltage stabilizing module in the cut-in constant voltage protection device connected in parallel with the target cell, and judge whether the voltage value of the voltage stabilizing module meets the preset voltage condition; when the voltage stabilizing module is judged When the voltage value does not meet the preset voltage condition, trigger the execution of the above adjustment to adjust the voltage value of the voltage stabilizing module in the cut-in constant voltage protection device connected in parallel with the target cell, so that the voltage value of the voltage stabilizing module meets the preset voltage Conditional operation.

It can be seen that this optional embodiment can also judge the voltage value of the voltage stabilizing module 101 before adjusting the voltage value of the voltage stabilizing module, which is beneficial to reduce unnecessary voltage value adjustment operations.

In yet another optional embodiment, the cell protection control module 302 is also used for:

When there is a target cell and it is judged that the voltage value of the voltage stabilizing module satisfies the preset voltage condition, a cut-in instruction is sent to the cut-in constant voltage protection device connected in parallel with the target cell. The voltage stabilizing modules in the parallel-connected cut-in constant voltage protection device currently meet the circuit cut-in condition.

Further, when there is a target cell, the cell protection control module 302 will cut in the voltage stabilizing module in the cut-in constant voltage protection device connected in parallel with the target cell, and the specific ways of cutting into the circuit where the target cell is located include:

Detect whether there is a circuit cut-in command. When the circuit cut-in command is detected, the voltage stabilizing module in the cut-in constant voltage protection device connected in parallel with the target cell is cut into the circuit where the target cell is located. The circuit cut-in command is based on A cut-in instruction is generated.

It can be seen that this optional embodiment can not only realize the intelligent control of switching the voltage stabilizing module to the battery circuit through the loop cut-in command, but also helps to improve the accuracy of the switching control of the voltage stabilizing module, and can also ensure that the voltage value of the voltage stabilizing module When the preset voltage requirements are met, the voltage stabilizing module is controlled to cut in, which ensures zero pressure difference switching and no switching stress.

Embodiment four

Please refer to FIG. 6 . FIG. 6 is a schematic structural diagram of another control device for a cut-in constant voltage protection circuit disclosed by an embodiment of the present invention. Wherein, 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 cut-in constant voltage protection circuit described in the first embodiment. As shown in Figure 6, the control device includes:

A memory 401 storing executable program codes;

a processor 402 coupled to the memory 401;

The processor 402 invokes the executable program code stored in the memory 401 to execute some or all steps of the control method for the cut-in constant voltage protection circuit described in the second embodiment.

Embodiment five

The embodiment of the present invention discloses a computer storage medium. The computer storage medium stores computer instructions. When the computer instructions are called, it is used to execute part or all of the control method for the cut-in constant voltage protection circuit described in the second embodiment. step.

The above-described embodiments of the device and the cut-in constant voltage protection circuit are only illustrative, and the modules described as separate components may or may not be physically separated, and the components shown as modules may be or are not It may not be a physical module, that is, it may be located in one place, or it may be distributed to multiple network modules. Part or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. It can be understood and implemented by those skilled in the art without any creative effort.

Through the specific description of the above embodiments, those skilled in the art can clearly understand that each implementation manner can be implemented by means of software plus a necessary general-purpose hardware platform, and of course also by hardware. Based on this understanding, the above-mentioned technical solution essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, and the storage medium includes a read-only memory (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), Electronically Erasable Programmable Read-Only Memory (EEPROM), Compact Disc Read-Only Memory , CD-ROM) or other optical disk storage, magnetic disk storage, tape storage, or any other computer-readable medium that can be used to carry or store data.

Finally, it should be noted that the disclosure of a cut-in constant voltage protection circuit, control method, device, and computer storage medium disclosed in the embodiment of the present invention is only a preferred embodiment of the present invention, and is only used to illustrate the technology of the present invention. scheme, rather than its limitation; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand; it can still modify the technical scheme described in the foregoing embodiments, or modify the Some technical features are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (12)

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 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.

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 cut-in constant voltage protection device further comprises:

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.

5. The cut-in constant voltage protection circuit according to claim 4, wherein 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.

6. The cut-in constant voltage protection circuit according to claim 5, 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.

7. The cut-in constant voltage protection circuit according to claim 6, 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.

8. 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,

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.

9. 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 8, 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;

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.

10. The control method of the cut-in constant voltage protection circuit according to claim 9, characterized in that the method further comprises:

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.

11. 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 8, 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.

12. 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 9 or 10 when called.

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