CN215646321U

CN215646321U - Formation and capacitance circuit, equipment and system

Info

Publication number: CN215646321U
Application number: CN202122310143.0U
Authority: CN
Inventors: 毛广甫
Original assignee: Repower Technology Co ltd
Current assignee: Repower Technology Co ltd
Priority date: 2021-09-23
Filing date: 2021-09-23
Publication date: 2022-01-25
Anticipated expiration: 2031-09-23

Abstract

The present application provides a chemical component circuit, equipment and system, the circuit includes a power supply circuit and a plurality of charge and discharge circuits, and the plurality of charge and discharge circuits are connected in series between the positive and negative electrodes of the power supply circuit in sequence. The charging and discharging circuit includes a main circuit switch and a bypass switch. When the main circuit switch is turned on and the bypass switch is turned off, the charging and discharging circuit can conduct the connection between the battery pack and the power supply circuit; When the bypass switch is turned on, the charging and discharging circuit can disconnect the connection between the battery pack and the power circuit. It can be seen that, in the present application, each battery pack only needs to be provided with one set of switching components, that is, multiple battery cells share one set of switching components, which can effectively reduce the use of components compared with the traditional technology. Effectively reduce costs.

Description

Formation and capacitance circuit, equipment and system

Technical Field

The application relates to the technical field of lithium batteries, in particular to a formation and grading circuit, formation and grading equipment and a formation and grading system.

Background

The lithium ion battery (hereinafter referred to as lithium battery) has the advantages of high energy density, long service life, high rated voltage, low self-discharge rate, environmental protection and the like, so the lithium ion battery is quite widely applied, for example, the lithium battery can be applied to new energy automobiles, power grid energy storage, digital products and the like.

In the manufacturing process of lithium batteries, formation and capacity grading are two very important processes, both of which affect the quality of the batteries. Because the formation and the capacity grading have commonality in the basic principle, the formation and the capacity grading can be completed by one formation and capacity grading system. In the prior art, when a partial formation and capacity grading system is used for formation or capacity grading, batteries are connected in series in sequence, but the partial formation and capacity grading system has the problem of high cost.

SUMMERY OF THE UTILITY MODEL

Based on this, the application provides a chemical composition capacitance circuit, chemical composition capacitance equipment and chemical composition capacitance system to reduce the cost of chemical composition capacitance system.

In a first aspect, the present application provides a chemical composition capacitance circuit for a chemical composition capacitance device, including:

the power supply circuit is used for connecting power supply equipment; and

the charging and discharging circuits are sequentially connected in series between the positive electrode and the negative electrode of the power supply circuit;

wherein the charge and discharge circuit comprises a main circuit switch and a bypass switch; the first end of the main circuit switch is connected with the first end of the bypass switch, and the second end of the main circuit switch is used for being connected with the anode of the battery pack through a first connecting piece in the component capacitance equipment; the second end of the bypass switch is used for being connected with the negative electrode of the battery pack through a second connecting piece in the component capacitance equipment; the junction of the first end of the main circuit switch and the first end of the bypass switch is used as the positive electrode end of the charge and discharge circuit, and the junction of the second end of the bypass switch and the second connecting piece is used as the negative electrode end of the charge and discharge circuit; the battery pack comprises a plurality of battery monomers which are sequentially connected in series;

when the main circuit switch is turned on and the bypass switch is turned off, the charging and discharging circuit can turn on the connection between the battery pack and the power supply circuit; when the main switch is turned off and the bypass switch is turned on, the charge and discharge circuit can disconnect the connection between the battery pack and the power supply circuit

Optionally, the charge and discharge circuit further comprises an anti-reverse switch; the reverse connection prevention switch is connected between the second end of the bypass switch and the second connecting piece.

Optionally, a connection part of the reverse connection prevention switch and the second connecting piece is used as a negative electrode end of the charge and discharge circuit.

Optionally, the charging and discharging circuit is provided with an anti-impact circuit; the anti-impact circuit comprises a capacitor, a charging switch and a diode; the first end of the capacitor is connected with the first connecting piece through the charging switch and is connected with the anode of the power circuit through the diode, and the second end of the capacitor is respectively connected with the second connecting piece and the cathode of the power circuit; the diode is used for preventing the power circuit from charging the capacitor.

Optionally, the anti-impact circuit further includes a current-limiting resistor; the current limiting resistor is connected between the first connecting piece and the connection position of the charging switch and the diode.

Optionally, the number of the battery cells in the battery pack is less than or equal to a preset threshold.

Optionally, the charge and discharge circuit further includes an overcurrent protection element; the overcurrent protection element is connected between the second end of the main circuit switch and the first connecting piece.

Optionally, the charge and discharge circuit further includes a ripple inductor; the ripple inductor is connected between the second end of the main circuit switch and the first connecting piece.

In a second aspect, the present application provides a component capacitance apparatus comprising the component capacitance circuit according to the first aspect.

In a third aspect, the present application provides a component-capacitive system comprising a power supply device and a component-capacitive device as described in the second aspect.

The application provides a formation partial volume circuit, formation partial volume equipment and formation partial volume system, this circuit include a power supply circuit and a plurality of charge-discharge circuit, and a plurality of charge-discharge circuit establish ties in proper order between power supply circuit's positive negative pole. The charging and discharging circuit comprises a main circuit switch and a bypass switch, and when the main circuit switch is switched on and the bypass switch is switched off, the charging and discharging circuit can switch on the connection between the battery pack and the power circuit; and when the main circuit switch is disconnected and the bypass switch is switched on, the charging and discharging circuit can disconnect the connection between the battery pack and the power circuit. Therefore, each battery pack in the application only needs to be provided with one set of switch components, namely, one set of switch components shared by a plurality of battery monomers, compared with the prior art, the battery pack can effectively reduce the use of the components and parts, and the cost is effectively reduced.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic circuit diagram of a conventional chemical composition/capacitance system;

fig. 2 is a schematic circuit structure diagram of a chemical composition capacitance circuit according to an embodiment of the present disclosure;

FIG. 3 is a schematic diagram of an exemplary circuit structure of a capacitive circuit according to an embodiment of the present disclosure;

fig. 4 is a schematic circuit diagram of a charging/discharging circuit according to an embodiment of the present disclosure;

fig. 5 is a schematic diagram of an exemplary circuit structure in which a plurality of battery cells are sequentially connected in series according to an embodiment of the present disclosure;

fig. 6 is a schematic diagram of an equivalent circuit structure of a charge/discharge circuit according to an embodiment of the present disclosure;

fig. 7 is a schematic diagram of another equivalent circuit structure of a charge and discharge circuit in the embodiment of the present application;

FIG. 8 is a schematic diagram of a circuit structure when the charge and discharge circuit includes an anti-reverse switch according to an embodiment of the present disclosure;

fig. 9 is a schematic circuit diagram of an anti-surge circuit in the embodiment of the present application;

fig. 10 is a schematic circuit diagram of an alternative circuit configuration of the anti-surge circuit in the embodiment of the present application;

fig. 11 is a schematic diagram of a circuit structure when the charging and discharging circuit includes an overcurrent protection file according to an embodiment of the present application;

fig. 12 is a schematic diagram of a circuit structure when the charging and discharging circuit includes a ripple inductor according to an embodiment of the present disclosure;

FIG. 13 is a schematic diagram of an exemplary circuit structure of a capacitive circuit in an embodiment of the present application;

FIG. 14 is a schematic structural diagram of a chemical component container apparatus according to an embodiment of the present disclosure;

fig. 15 is a schematic structural diagram of a chemical component content system according to an embodiment of the present disclosure.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It is to be understood that the terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the specification of the present application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should also be understood that the terms "first," "second," "third," "fourth," and the like in the description, in the claims, or in the above-described drawings (if any) are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order, and may be construed to indicate or imply relative importance or implicitly to the features indicated. In addition, the term "connected" (if any) in the specification, claims or drawings of the present application is to be interpreted broadly, for example, the term "connected" may be a fixed connection, a detachable connection, an integrated connection, an electrical connection, or a signal connection, and the term "connected" may be a direct connection or an indirect connection via an intermediate medium. Furthermore, the term "and/or" (if present) as used in the specification, claims, or drawings of the present application refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.

Moreover, in the subject application, any embodiment or design described herein as "exemplary" or "e.g.," is not to be construed as preferred or advantageous over other embodiments or designs, and rather, use of the term "exemplary" or "e.g.," is intended to present relevant concepts in a concrete fashion.

In the manufacturing process of a lithium battery, formation and capacity grading are two very important processes, wherein the formation refers to activating positive and negative electrode substances inside the battery in a certain charging and discharging mode and forming a Solid Electrolyte Interface (SEI) film on the surfaces of the positive and negative electrode materials of the battery; capacity grading refers to the cyclic charge and discharge of the formed batteries so as to eliminate the problematic batteries and group the batteries according to capacity and internal resistance. Therefore, the formation and the capacity grading have common characteristics in the basic principle, and the formation and the capacity grading of the lithium battery are generally completed by one formation and capacity grading system.

In the conventional technology, when a partial formation and capacity grading system performs formation or capacity grading, batteries are connected in series in sequence. For example, in the chemical composition and capacity grading system shown in fig. 1, when all the relays K are turned off, the batteries are connected in series in sequence, and in this state, the system can simultaneously perform chemical composition or capacity grading on each battery. However, the inventors of the present application found that: in a chemical composition and capacitance system in the conventional technology, each single battery needs to be provided with a set of switching elements, for example, the chemical composition and capacitance system shown in fig. 1, and each single battery needs to be provided with a relay, so that the cost of the chemical composition and capacitance system is too high.

Therefore, the embodiment of the application provides a chemical composition capacitance circuit, a chemical composition capacitance device and a chemical composition capacitance system.

The chemical composition capacitance circuit 10 provided in the embodiment of the present application can be applied to a chemical composition capacitance system, for example, a chemical composition capacitance device in the system. As shown in fig. 2, the composition capacitive circuit 10 may include a power circuit 110 and a plurality of charging and discharging circuits 120. The power circuit 110 is used for connecting power devices in the chemical composition capacitive system, and it should be noted that bidirectional energy transmission can be realized between the power circuit 110 and the power devices; the plurality of charging and discharging circuits 120 are sequentially connected in series between the positive and negative poles of the power circuit 110, that is, the plurality of charging and discharging circuits 120 are sequentially connected in series and then connected to the power circuit 110.

For example, as shown in fig. 3, the power supply device may include an AC/DC circuit, the power supply circuit 110 may include a DC/DC circuit, and the number of the charge and discharge circuits 120 may be four. Based on the method, in a charging stage of formation or capacity grading, the AC/DC circuit can convert alternating current output by the alternating current power supply into direct current and transmit the direct current to the DC/DC circuit; the DC/DC circuit can boost or buck the DC power and output the DC power to the four charge/discharge circuits 120 connected in series. In the discharge stage of formation or capacity grading, the electric energy transmission process in this stage is opposite to the charging stage, and therefore, the details are not repeated. It can be seen that the power supply device and the power supply circuit 110 jointly implement the processing of the power in this example, but those skilled in the art should know that the power supply device or the power supply circuit 110 alone can also implement the processing of the power, and the embodiment of the present application is not limited thereto. It is further noted that the type of ac power source may include one or more types, for example, the type of ac power source may include at least one of a power grid, photovoltaic, and wind energy.

In an embodiment of the present application, as shown in fig. 4, the charge and discharge circuit 120 may include a main switch Q1 and a bypass switch Q2, and each of the main switch Q1 and the bypass switch Q2 may include a MOS transistor. The first end of the main circuit switch Q1 is connected with the first end of the bypass switch Q2, meanwhile, the second end of the main circuit switch Q1 is used for connecting the positive pole of the battery pack through the first connecting piece a in the component-capacitor equipment, and the second end of the bypass switch Q2 is used for connecting the negative pole of the battery pack through the second connecting piece B in the component-capacitor equipment. It can be seen that the junction between the first end of the main switch Q1 and the first end of the bypass switch Q2 can be the positive terminal of the charge/discharge circuit 120, and it can be understood that the positive terminal is connected to the positive terminal of the power circuit 110 or the negative terminal of the "last" charge/discharge circuit; similarly, the junction of the second terminal of the bypass switch Q2 and the second connection B may be the negative terminal of the charge and discharge circuit 120, and it is understood that the negative terminal is connected to the negative terminal of the power circuit 110 or the positive terminal of the "next" charge and discharge circuit.

In addition, it should be noted that the battery pack according to the embodiment of the present application includes a plurality of battery cells connected in series in sequence, for example, includes 8 battery cells connected in series in sequence, and it can be understood that the number of the battery cells in the battery pack may be set reasonably. In an embodiment, the number of the battery cells in the battery pack is less than or equal to a preset threshold, for example, less than or equal to 8, and a specific value of the preset threshold may be reasonably set according to an actual situation, so long as the number of the battery cells in the battery pack does not exceed the preset threshold, the difference between the battery cells may be considered as negligible on the whole, and thus the battery pack may be treated as one battery pack. Exemplarily, the formation and grading system in the conventional technology can charge and discharge 32 battery cells simultaneously, and then the value of the preset threshold value can be reasonably set to 8, so that the number of the battery cells in the battery pack can be 4, 8, and the like.

In one embodiment, for a post-type cell, the first connector a and the second connector B may each include a current probe. Specifically, a needle bed including a plurality of current probes is disposed in the chemical composition and volume equipment, so that a plurality of battery cells can realize a connection relationship of sequentially connecting in series through the plurality of current probes, for example, as shown in fig. 5, a battery cell has a positive pole column and a negative pole column, and two adjacent battery cells can realize positive and negative connection through the two current probes having the connection relationship, so that it can be understood that the first connection member a is a current probe corresponding to the positive pole column of the "first" battery cell, and the second connection member B is a current probe corresponding to the negative pole column of the "last" battery cell. Of course, the connection relationship of the multiple battery cells connected in series in sequence may also be implemented in other reasonable manners, which is not limited in this application. In other embodiments, for tab type cells, the first connector a and the second connector B may each comprise a cell clamp, and will not be discussed in detail herein.

Based on this, when the main switch Q1 is turned on and the bypass switch Q2 is turned off, the charge and discharge circuit 120 can turn on the connection between the battery pack and the power supply circuit 110; when the main switch Q1 is turned off and the bypass switch Q2 is turned on, the charge and discharge circuit 120 can disconnect the battery pack from the power supply circuit 110 (i.e., bypass the battery pack). In one embodiment, the main switch Q1 and the bypass switch Q2 can be turned on or off under the control of a main control circuit, which may be a control system in a capacitive device or the like.

The operation principle of the composition and capacity circuit 10 will be described in detail with reference to fig. 6 and 7, and it should be noted that in the actual battery manufacturing process, the composition and capacity circuit usually undergoes a plurality of charging and discharging operations, that is, the charging and discharging operations described below are repeated:

charging stage of formation or grading: (1) when charging is started, each of the charging and discharging circuits 120 may be controlled to be the same, specifically, the main switch Q1 may be controlled to be turned on, and the bypass switch Q2 may be controlled to be turned off, and at this time, an equivalent circuit diagram of the charging and discharging circuit 120 is shown in fig. 6, which turns on the connection between the battery pack and the power supply circuit 110. It can be understood that, at this time, all the battery packs are connected in series in sequence, and since the battery cells in the battery packs are also connected in series in sequence, all the battery cells are connected in series between the positive electrode and the negative electrode of the power circuit 110 in sequence, so that the charging can be performed simultaneously. (2) In the charging process, the charging time of each battery pack is different, so that the battery pack needs to be bypassed when the battery pack is charged, specifically, the main switch Q1 can be controlled to be turned off, and the bypass switch Q2 can be controlled to be turned on, at this time, the equivalent circuit diagram of the charging and discharging circuit 120 is shown in fig. 7, which disconnects the battery pack from the power circuit 110. It can be understood that after the battery pack is bypassed, the other battery packs are still in the connection relationship of serial connection in sequence, so that the charging stage of formation or capacity grading is completed when all the battery packs are bypassed; it should be noted that whether the battery pack is charged or not may be set according to practical situations, for example, because the battery pack has integrity, when the voltage value of one battery cell in the battery pack exceeds the first voltage threshold, the battery pack is considered to be charged. In one embodiment, the electrical parameter (e.g., output current) of the power circuit 110 can be dynamically adjusted according to the number of cells being charged.

And (3) a discharge stage of formation or capacity grading: (1) when the discharge is started, each of the charge and discharge circuits 120 may be controlled to be the same, specifically, the main switch Q1 may be controlled to be turned on, and the bypass switch Q2 may be controlled to be turned off, and at this time, the equivalent circuit diagram of the charge and discharge circuit 120 is shown in fig. 6, which turns on the connection between the battery pack and the power supply circuit 110. It can be understood that, at this time, all the battery packs are connected in series in sequence, and since the battery cells in the battery packs are also connected in series in sequence, all the battery cells are connected in series between the positive electrode and the negative electrode of the power circuit 110 in sequence, so that the discharging can be performed simultaneously. (2) In the discharging process, the discharging time of each battery pack is different, so that the battery pack needs to be bypassed when the discharging of the battery pack is completed, specifically, the main switch Q1 can be controlled to be turned off, and the bypass switch Q2 can be controlled to be turned on, and at this time, the equivalent circuit diagram of the charging and discharging circuit 120 is shown in fig. 7, which disconnects the battery pack from the power circuit 110. It can be understood that after the battery pack is bypassed, the other battery packs are still in the serial connection relationship in sequence, so that the capacity forming or grading discharge stage is completed when all the battery packs are bypassed; it should be noted that whether the battery pack completes discharging or not may be set according to practical situations, for example, because the battery pack has integrity, when the voltage value of one battery cell in the battery pack is lower than the second voltage threshold, it may be considered that the battery pack has completed discharging.

By last knowing, in the conventional art, each battery monomer just need set up one set of switch components and parts, but through this application embodiment, each group battery only need set up one set of switch components and parts, also promptly, a plurality of battery monomers one set of switch components and parts of sharing, consequently, this application embodiment can effectual reduction components and parts's use, the effective cost that has reduced.

In an embodiment, as shown in fig. 8, the charge and discharge circuit 120 may further include an anti-reverse switch Q3, the anti-reverse switch Q3 may include a MOS transistor, and the anti-reverse switch Q3 is connected between the second end of the bypass switch Q2 and the second connection B. Specifically, when the battery pack is connected to the charge/discharge circuit 120, reverse connection may occur (for example, reverse connection due to manual operation error), and in this case, when the battery pack is charged and discharged, the battery, the components, and the like may be damaged. Based on this, before the battery pack is connected, the reverse connection prevention switch Q3 can be controlled to be disconnected, so that if the reverse connection condition occurs when the battery is assembled, the reverse connection prevention switch Q3 is disconnected, so that a loop cannot be formed between the positive pole and the negative pole of the battery pack, and the problem of damage caused by reverse connection of the battery pack can be avoided; of course, if the reverse connection of the battery pack does not occur during the connection, the reverse connection prevention switch Q3 can be directly controlled to be conducted. In one embodiment, the master control circuit described above can determine whether the reverse connection of the battery pack occurs, and accordingly control the conduction or disconnection of the reverse connection prevention switch Q3.

In one embodiment, as shown in fig. 8, the connection point of the reverse connection prevention switch Q3 and the second connection member B can be used as the negative terminal of the charge and discharge circuit 120, so that energy consumption can be effectively saved. Specifically, during the charging and discharging process of formation or capacity grading, the duration of the connection state between the battery pack and the power circuit 110 is much longer than the duration of the disconnection state, that is, the duration of the charging or discharging of the battery pack is much longer than the duration of the bypass of the battery pack. Based on this, it can be understood from the foregoing discussion that the equivalent circuit diagram of the battery pack during charging or discharging is shown in fig. 6, and it can be understood that since the connection point of the anti-reverse connection switch Q3 and the second connection member B is used as the negative terminal in the embodiment of the present application, electric energy of the battery pack during charging or discharging does not pass through the anti-reverse connection switch Q3, that is, the battery pack during charging or discharging does not cause additional energy consumption due to the anti-reverse connection switch Q3.

In one embodiment, the charging and discharging circuit 120 is provided with an anti-surge circuit, and it is understood that each charging and discharging circuit has an anti-surge circuit corresponding thereto. As shown in fig. 9, the anti-shock circuit includes a capacitor C, a charging switch Q4, and a diode D, wherein a first end of the capacitor C is connected to the first connection element a through the charging switch Q4 and is connected to the anode of the power circuit 110 through the diode D, and a second end of the capacitor C is connected to the second connection element B and the cathode of the power circuit 110, respectively; the charging switch Q4 may include a MOS transistor; the diode D is used to prevent the power circuit 110 from charging the capacitor C, so the anode of the diode D is connected to the first end of the capacitor C, and the cathode is connected to the anode of the power circuit 110.

Specifically, when the battery pack is connected to the circuit, if the battery cells in the battery pack have stored energy, a rush current may be generated, that is, when the battery pack is connected with electricity, a rush current may be generated, which may cause damage to components and parts. Based on this, before the battery pack is connected into the circuit, the main circuit switch Q1 can be controlled to be disconnected, the charging switch Q4 is controlled to be disconnected, so that when the battery pack is connected, the charging switch Q4 can be controlled to be switched on under the condition that no abnormal condition (for example, the condition that the battery pack is reversely connected) exists, so that the battery pack, the charging switch Q4 and the capacitor C form a loop, so that the impact current can charge the capacitor C, and at the moment, the main circuit switch Q1 is in a disconnected state, so that the impact current cannot cause damage to components. When there is no inrush current in the battery pack, the charging switch Q4 is controlled to be turned off, and in an embodiment, whether there is an inrush current in the battery pack may be determined according to a current value flowing through the battery pack, or may be determined in other feasible manners.

It is worth mentioning that the capacitor C stores the energy carried by the impact current, so that as the energy stored by the capacitor C increases, the voltage value of the capacitor C is larger than the voltage value of the power circuit 110, so that the capacitor C can discharge to the power circuit 110, that is, the capacitor C can feed the stored energy back to the power circuit 110. Therefore, the problem of damage caused by impact current is avoided, and the energy consumption of the system is further reduced.

In one embodiment, as shown in fig. 10, the anti-shock circuit further includes a current limiting resistor R connected between the first connection a and a connection of the charging switch Q4 and the diode D. Specifically, since the battery pack includes a plurality of battery cells, which may cause an excessive inrush current to damage the capacitor C, the current flowing through the capacitor C may be effectively limited by the current limiting resistor R, so as to protect the capacitor C.

In one embodiment, as shown in fig. 11, the charge and discharge circuit 120 further includes an overcurrent protection element FU connected between the second terminal of the main switch Q1 and the first connection a. Specifically, when a circuit is in a fault or abnormal state, a large current is generated, which may damage components, batteries, and the like in the circuit, so that the overcurrent protection element FU can act when the circuit has a large current, and damage to the components, the batteries, and the like is avoided. In one embodiment, the over-current protection device FU comprises a fuse that can blow when a large current is applied to the circuit.

In one embodiment, as shown in fig. 12, the charging and discharging circuit 120 further includes a ripple inductor L connected between the second terminal of the main circuit switch Q1 and the first connection element a. Specifically, the power output from the power circuit 110 may contain an ac component, so the ripple inductor L may function as a ripple, so that the power input to the battery pack is better.

In summary, the formation-capacitance circuit in the embodiment of the present application can be exemplarily shown in fig. 13, and please refer to the foregoing discussion for details of the connection relationship and the like, which is not described herein again. Based on this, before the battery pack is connected into the circuit, the main circuit switch Q1 can be controlled to be switched off, the reverse connection prevention switch Q3 can be controlled to be switched off, and the charging switch Q4 can be controlled to be switched off. When the battery pack is connected with the circuit, if the battery pack has no abnormal conditions such as reverse connection and the like, the reverse connection prevention switch Q3 can be controlled to be switched on, the charging switch Q4 is controlled to be switched on, and at the moment, the impact current generated by the connection of the battery pack charges the capacitor C through the current limiting resistor R; if the reverse connection abnormal condition of the battery pack occurs, the reverse connection prevention switch Q3 is kept to be disconnected, and the charging switch Q4 is kept to be disconnected, so that the purpose of protection is achieved. After the battery pack has no impact current, the charging switch Q4 can be controlled to be switched off; it should be noted that the moment when the reverse connection prevention switch Q3 is turned on may not be the moment when the battery pack is not reversely connected, may also be the moment when the battery pack does not have an inrush current, and may of course be other feasible moments. Thus, the battery pack can be subjected to formation and capacity grading charging or discharging: on one hand, in the charging stage of formation or capacity grading, the main circuit switch Q1 may be controlled to be turned on, and the bypass switch Q2 may be controlled to be turned off, so as to turn on the connection between the battery pack and the power circuit 110 for charging; after charging is completed, the main switch Q1 may be controlled to be turned off, the bypass switch Q2 may be controlled to be turned on, and the connection between the battery pack and the power circuit 110 may be broken (i.e., the battery pack may be bypassed). Similarly, on the other hand, in the discharge phase of formation or capacity division, the main circuit switch Q1 may be controlled to be turned on and the bypass switch Q2 may be controlled to be turned off to turn on the connection between the battery pack and the power circuit 110 to perform discharge; after the discharge is completed, the main switch Q1 may be controlled to be turned off, the bypass switch Q2 may be controlled to be turned on, and the connection between the battery pack and the power circuit 110 may be broken (i.e., the battery pack may be bypassed). It can be seen that through this application embodiment, each group battery only need set up one set of switch components and parts, also, a plurality of battery monomer one set of switch components and parts of sharing, consequently, this application embodiment can effectual reduction components and parts's use, effectively the cost is reduced.

In an embodiment of the present invention, as shown in fig. 14, the chemical capacitive device 100 includes the chemical capacitive circuit 10 as described above. Reference may be made to the foregoing discussion for details of the embodiments that are not discussed herein.

As shown in fig. 15, the chemical component capacitance system according to the embodiment of the present application includes the chemical component capacitance apparatus 100 and the power supply apparatus 200 as described above. Reference may be made to the foregoing discussion for details of the embodiments that are not discussed herein.

While the invention has been described with reference to specific embodiments, the scope of the invention is not limited thereto, and those skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the invention. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A chemical composition capacitance circuit for a chemical composition capacitance device, comprising:

the power supply circuit is used for connecting power supply equipment; the charging and discharging circuits are sequentially connected between the positive electrode and the negative electrode of the power supply circuit in series;

when the main circuit switch is turned on and the bypass switch is turned off, the charging and discharging circuit can turn on the connection between the battery pack and the power supply circuit; when the main circuit switch is turned off and the bypass switch is turned on, the charge and discharge circuit can disconnect the connection between the battery pack and the power supply circuit.

2. The capacitive circuit according to claim 1, wherein the charge and discharge circuit further comprises an anti-reverse switch;

the reverse connection prevention switch is connected between the second end of the bypass switch and the second connecting piece.

3. The capacitance-variable circuit according to claim 2, wherein the junction of the reverse-connection prevention switch and the second connecting member serves as a negative terminal of the charge and discharge circuit.

4. The chemical composition capacity circuit according to claim 1, wherein the charge and discharge circuit is provided with an anti-shock circuit;

the anti-impact circuit comprises a capacitor, a charging switch and a diode; the first end of the capacitor is connected with the first connecting piece through the charging switch and is connected with the anode of the power circuit through the diode, and the second end of the capacitor is respectively connected with the second connecting piece and the cathode of the power circuit; the diode is used for preventing the power circuit from charging the capacitor.

5. The chemical composition capacitance circuit according to claim 4, wherein the anti-surge circuit further comprises a current limiting resistor;

the current limiting resistor is connected between the first connecting piece and the connection position of the charging switch and the diode.

6. The chemical component capacity circuit according to any one of claims 1 to 5, wherein the number of battery cells in the battery pack is less than or equal to a preset threshold.

7. The capacitive circuit according to any one of claims 1 to 5, wherein the charging and discharging circuit further comprises an overcurrent protection element;

the overcurrent protection element is connected between the second end of the main circuit switch and the first connecting piece.

8. The chemical component capacitance circuit according to any one of claims 1-5, wherein the charge and discharge circuit further comprises a ripple inductor;

the ripple inductor is connected between the second end of the main circuit switch and the first connecting piece.

9. A chemical composition capacitance device comprising the chemical composition capacitance circuit according to any one of claims 1 to 8.

10. A chemical composition and capacitance system comprising a power supply apparatus and the chemical composition and capacitance apparatus according to claim 9.