Charging and discharging control circuit and formation and capacity grading system

Abstract

The embodiment of the utility model discloses a charge and discharge control circuit and a formation and capacity grading system, and belongs to the technical field of batteries, the circuit comprises a control module, a voltage conversion module and a plurality of battery packs; each first output end of the control module is connected with each first end of the voltage conversion module, and each first input end of the control module is connected with the first end of each battery pack. Each second end and each third end of the voltage conversion module are respectively connected with the second end and the third end of each battery pack, and the voltage conversion module is also used for being connected with external equipment; the control module is used for detecting electric energy parameters of each battery pack and outputting electric signals to the voltage conversion module; and the voltage conversion module is used for charging each battery pack and enabling each battery pack to discharge to external equipment through the voltage conversion module. According to the invention, by providing the plurality of battery packs connected in parallel, more battery storage locations can be provided, and formation and capacity grading can be carried out on more batteries at the same time under the condition that the formation and capacity grading effects are not influenced.

Description

Technical Field

[0001] This application relates to the field of battery technology, and includes, but is not limited to, a charge / discharge control circuit and a formation / capacity building system. Background Technology

[0002] With the rapid development of battery technology, battery capacity is increasing, and the requirements for battery formation and capacity grading are also becoming more stringent. Formation and capacity grading are crucial steps in the battery production process. Battery formation requires charging, while capacity grading requires discharging the battery. Therefore, a circuit capable of controlling the charging and discharging of the battery is needed.

[0003] In related technologies, the conventional formation and capacity testing scheme generally involves connecting multiple batteries in series to obtain a series battery channel. The total port voltage of this battery channel is the sum of the voltages of each battery. Then, an AC-DC converter and a DC-DC converter are used to charge each battery in this battery channel, thereby completing the formation operation of each battery. After the formation is completed, each battery in this battery channel is then discharged to the outside through the AC-DC converter and the DC-DC converter, thereby completing the capacity testing operation of each battery.

[0004] However, because the total port voltage of this battery channel is limited by the bus voltage of the AC-DC converter and the output voltage of the DC-DC converter, the number of batteries that can be connected in series in this battery channel is limited. This results in a limited number of battery storage spaces provided by the relevant technical solutions. Utility Model Content

[0005] In view of this, the charge / discharge control circuit and formation / capacity testing system provided in this application, by providing multiple parallel battery packs, can provide more battery storage space, and simultaneously perform formation / capacity testing for more batteries without affecting the formation / capacity testing effect. The charge / discharge control circuit and formation / capacity testing system provided in this application are implemented as follows:

[0006] In one aspect of this application, a charging and discharging control circuit is provided. The circuit includes: a control module, a voltage conversion module, and multiple battery packs, each of which includes at least multiple batteries connected in series.

[0007] Each first output terminal of the control module is connected to each first terminal of the voltage conversion module, and each first input terminal of the control module is connected to the first terminal of each battery pack.

[0008] The second and third terminals of the voltage conversion module are respectively connected to the second and third terminals of each of the battery packs, and the voltage conversion module is also used to connect to external devices;

[0009] The control module is used to detect the electrical energy parameters of each battery pack and to output electrical signals to the voltage conversion module. The electrical energy parameters include voltage values ​​and / or current values.

[0010] The voltage conversion module is used to charge each of the battery packs and to discharge each of the battery packs to the external device through the voltage conversion module under the action of the electrical signal output by the control module.

[0011] Optionally, the voltage conversion module includes: an AC-DC conversion unit (AC-DC) and multiple DC-DC conversion units (DC-DC);

[0012] The first terminal of the AC-DC is used to connect to the external device, and the second and third terminals of the AC-DC are respectively connected to the first and second terminals of each DC-DC.

[0013] The third and fourth terminals of each DC-DC converter are respectively connected to the second and third terminals of each battery pack, and the fifth terminal of each DC-DC converter is respectively connected to the first output terminal of the control module.

[0014] The AC-DC converter is used to convert the first alternating current input from the external device into a first direct current output to each of the DC-DC converters, and to convert the second direct current output from each of the DC-DC converters into a second alternating current output to the external device.

[0015] The DC-DC converter is used to convert the first DC power into a third DC power and output it to the battery pack connected to the DC-DC converter under the action of the electrical signal, and to convert the fourth DC power output by the battery pack into a second DC power and output it to the AC-DC converter.

[0016] Optionally, the DC-DC converter includes: a controller, a drive circuit, and a power circuit;

[0017] The first terminal of the controller is connected to the first terminal of the control module, the second terminal of the controller is connected to the first terminal of the drive circuit, and the second terminal of the drive circuit is connected to the first terminal of the power circuit.

[0018] The second and third terminals of the power circuit are connected to the second and third terminals of the AC-DC conversion unit, respectively, and the fourth and fifth terminals of the power circuit are connected to the second and third terminals of the battery pack, respectively.

[0019] The controller is used to control the drive circuit to drive the power circuit under the action of the electrical signal;

[0020] The power circuit is used to convert the first DC power into the third DC power under the drive of the drive circuit, and to control the drive circuit to convert the fourth DC power into the second DC power.

[0021] Optionally, the battery pack includes: the plurality of batteries connected in series;

[0022] The positive terminal of the first battery in each of the batteries is connected to the second terminal of the voltage conversion module, and the negative terminal of the last battery in each of the batteries is connected to the third terminal of the voltage conversion module.

[0023] The positive terminal of the nth battery in each of the batteries is connected to the negative terminal of the (n-1)th battery, where n is a positive integer greater than 1;

[0024] The positive or negative terminal of each battery is connected to the first input terminal of the control module.

[0025] Specifically, the control module is used to detect the electrical energy parameters of each battery in each battery pack.

[0026] Optionally, the battery pack further includes: a plurality of first switches, wherein the number of each first switch is equal to the number of each battery;

[0027] Each of the first switches is connected between the positive and negative terminals of each of the batteries;

[0028] The control terminal of each of the first switches is connected to each of the second output terminals of the control module;

[0029] Each of the first switches is used to be turned on under the control of the control module, so that the battery corresponding to each of the first switches is disconnected from other batteries.

[0030] Optionally, the battery pack further includes: a voltage acquisition unit;

[0031] Each acquisition terminal of the voltage acquisition unit is connected to the positive or negative terminal of each battery, and the output terminal of the voltage acquisition unit is connected to the first input terminal of the control module.

[0032] The voltage acquisition unit is used to acquire the voltage value of each battery and output the voltage value to the control module.

[0033] Optionally, the circuit further includes: a plurality of second switches;

[0034] Each of the second switches is connected between the voltage conversion module and each of the battery packs;

[0035] Each of the second switches is used to turn on or off under the control of the control module to connect or disconnect the power transmission path between the voltage conversion module and each of the battery packs.

[0036] Optionally, the circuit further includes: a plurality of voltage adjustment units;

[0037] Each of the voltage adjustment units is connected between the voltage conversion module and each of the battery packs;

[0038] Each of the voltage adjustment units is used to increase the voltage of the DC power output from each of the battery packs to the voltage conversion module under the control of the voltage conversion module.

[0039] Optionally, the control module is further configured to detect leakage current in the circuit, and to control the voltage conversion module to shut down and / or control the second switch corresponding to the voltage conversion module to turn off when the leakage current is greater than a preset threshold.

[0040] Another aspect of the embodiments of this application provides a formation and capacity control system, which includes at least the charge and discharge control circuit described in the embodiments of this application.

[0041] The charging and discharging control circuit and the formation and capacity testing system provided in this application embodiment are configured with a control module, a voltage conversion module, and multiple battery packs in the circuit, each battery pack including at least multiple batteries connected in series.

[0042] The control module can control the voltage conversion module to charge one or more battery packs simultaneously, or control the voltage conversion module to make one or more battery packs discharge simultaneously. Moreover, each battery pack can have multiple batteries connected in series. That is, the circuit provided in this application embodiment can achieve the purpose of charging or discharging each battery in multiple battery packs simultaneously.

[0043] In addition, when this circuit is applied to perform capacity testing on batteries, it can not only connect multiple batteries that need to be tested in series into a battery pack, but also connect multiple battery packs in parallel. By controlling the voltage conversion module, multiple battery packs can be charged or discharged simultaneously, so as to perform capacity testing on each battery in multiple battery packs at the same time.

[0044] In this way, by providing multiple battery packs in parallel, the circuit can perform formation and capacity testing on more batteries simultaneously without affecting the formation and capacity testing effect.

[0045] In this way, the circuit can provide more battery storage space during capacity formation, thereby solving the technical problems mentioned in the background art. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 This is a schematic diagram of the structure of the first charging and discharging control circuit provided in the embodiments of this application;

[0048] Figure 2 This is a schematic diagram of the structure of the second charge / discharge control circuit provided in the embodiments of this application;

[0049] Figure 3 This is a schematic diagram of the structure of a DC-DC conversion unit provided in an embodiment of this application;

[0050] Figure 4 This is a schematic diagram of the structure of the third charge / discharge control circuit provided in the embodiments of this application;

[0051] Figure 5 This is a schematic diagram of the structure of the fourth charge / discharge control circuit provided in the embodiments of this application;

[0052] Figure 6 This is a schematic diagram of the structure of the fifth charge / discharge control circuit provided in the embodiments of this application;

[0053] Figure 7 This is a schematic diagram of a formulation and compatibilization system provided in an embodiment of this application.

[0054] Figure label:

[0055] 100: Charge / discharge control circuit; 101: Control module; 102: Voltage conversion module; 103: Battery pack; 104: Voltage adjustment unit; 1021: AC-DC; 1022: DC-DC; 1031: Voltage acquisition unit.

[0056] C1, ..., Cn: Battery; Q1, ..., Qn: First switch; S1, ..., Sm:

[0057] The second switch, X: transforms into a containerized system. Detailed Implementation

[0058] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the specific technical solutions of this application will be further described in detail below with reference to the accompanying drawings of the embodiments of this application. The following embodiments are used to illustrate this application, but are not intended to limit the scope of this application.

[0059] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0060] In the following description, references are made to “some embodiments,” which describe a subset of all possible embodiments. However, it is understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0061] It should be noted that the terms "first, second, third" used in the embodiments of this application are used to distinguish similar or different objects and do not represent a specific order of objects. It can be understood that "first, second, third" can be interchanged in a specific order or sequence where permitted, so that the embodiments of this application described herein can be implemented in an order other than that illustrated or described herein.

[0062] In related technologies, the conventional formation and capacity testing scheme generally involves connecting multiple batteries in series to obtain a series battery channel. The total port voltage of this battery channel is the sum of the voltages of each battery. Then, an AC-DC converter and a DC-DC converter are used to charge each battery in this battery channel, thereby completing the formation operation of each battery. After the formation is completed, each battery in this battery channel is discharged to the outside through the AC-DC converter and the DC-DC converter, thereby completing the capacity testing operation of each battery.

[0063] However, because the total port voltage of this battery channel is limited by the bus voltage of the AC-DC converter and the output voltage of the DC-DC converter, the number of batteries that can be connected in series in this battery channel is limited. This results in a limited number of battery storage spaces provided by the relevant technical solutions.

[0064] For example, battery packs composed of cylindrical cells require many storage spaces for rapid formation and capacity testing, and existing technologies cannot meet this requirement.

[0065] To address this, this application provides a charge / discharge control circuit. This circuit includes a control module, a voltage conversion module, and multiple battery packs, each battery pack 103 comprising at least a plurality of batteries connected in series. Specifically, each first output terminal of the control module is connected to each first terminal of the voltage conversion module, and each first input terminal of the control module is connected to the first terminal of each battery pack 103. The second and third terminals of the voltage conversion module are connected to the second and third terminals of each battery pack 103, respectively. The voltage conversion module is also used to connect to external devices. Thus, by providing multiple parallel battery packs, more battery storage space can be provided, allowing for simultaneous formation and capacity testing of more batteries without affecting the formation and capacity testing effect.

[0066] This application uses a charge / discharge control circuit applied in a formation and capacity testing system as an example for illustration. However, it does not imply that this application's embodiments can only be applied to the formation and / or capacity testing operations of batteries in a formation and capacity testing system.

[0067] The charging and discharging control circuit provided in the embodiments of this application will be explained in detail below.

[0068] Figure 1 A schematic diagram of a charge / discharge control circuit provided in this application. See also... Figure 1 This application provides a charging and discharging control circuit 100, which includes a control module 101, a voltage conversion module 102, and multiple battery packs 103.

[0069] Each first output terminal of the control module 101 is connected to each first terminal of the voltage conversion module 102, and each first input terminal of the control module 101 is connected to the first terminal of each battery pack 103.

[0070] The second and third terminals of the voltage conversion module 102 are respectively connected to the second and third terminals of each battery pack 103. The voltage conversion module 102 is also used to connect to external devices.

[0071] The control module 101 is used to detect the electrical energy parameters of each battery pack 103 and to output electrical signals to the voltage conversion module 102.

[0072] The voltage conversion module 102 is used to charge each battery pack 103 and to discharge each battery pack 103 to the external device through the voltage conversion module 102 under the action of the electrical signal output by the control module 101.

[0073] In this embodiment, the control module 101 may include at least one unit with functions such as processing, detection, identification, control, and communication. For example, the control module 101 may include at least one microcontroller unit (MCU) and / or at least one advanced reduced instruction set processor (ARM). This application embodiment does not limit this.

[0074] Optionally, the control module 101 can also be used to establish a communication connection with any external terminal device to receive and respond to instructions sent by the terminal device, and to send detected parameters or other data to the terminal device. This application embodiment does not limit this aspect.

[0075] The first output terminal of the control module 101 is used to output the electrical signal to the first terminal of the voltage conversion module 102, and the first input terminal of the control module 101 is used to receive or detect the electrical energy parameters of the battery pack 103.

[0076] In this embodiment, the electrical energy parameter includes voltage and / or current values. The electrical signal can be a signal used to cause the voltage conversion module 102 to charge the battery pack 103, or to cause the voltage conversion module 102 to output electrical energy to the external device (that is, to cause each battery pack 103 to discharge to the outside).

[0077] Alternatively, the external device can refer to any possible AC power source, such as a power supply device connected to the mains power network.

[0078] Optionally, the voltage conversion module 102 can also be used to perform voltage conversion, such as converting AC voltage to DC voltage and vice versa. That is, the voltage conversion module 102 provided in this embodiment can be a device capable of bidirectional voltage conversion. For example, the voltage conversion module 102 may include bidirectional AC-DC and / or bidirectional DC-DC converters, which is not limited in this embodiment.

[0079] Specifically, when the voltage conversion module 102 needs to charge the battery pack 103, the external device can output corresponding AC power to the voltage conversion module 102, which then converts the AC power into DC power and outputs it to each battery pack 103. When the voltage conversion module 102 needs to output power to the external device, each battery pack 103 can output corresponding DC power to the voltage conversion module 102, which then converts the DC power into AC power and outputs it to the external device. In this way, the purpose of charging or discharging the battery pack 103 can be achieved.

[0080] It should be noted that the battery manufacturing process involves a formation and capacity testing process. Generally, formation is performed first, followed by capacity testing. During formation, each battery is first charged, and then allowed to discharge after a period of time to activate the chemical substances within each battery, enabling it to function properly.

[0081] Specifically, upon receiving a capacity-setting command from an external terminal device, the control module 101 first outputs an electrical signal to the voltage conversion module 102, causing the voltage conversion module 102 to charge the battery pack 103. Then, the voltage conversion module 102 can output the electrical energy input from the external device to each battery pack 103, thereby charging each battery pack 103. At the same time, the control module 101 can continuously detect the electrical parameters of each battery pack 103 (specifically, it can detect the electrical parameters of each battery in the battery pack 103 separately). After determining that each battery in a battery pack 103 is fully charged, the control module 101 outputs an electrical signal to the voltage conversion module 102, causing the voltage conversion module 102 to stop charging that battery pack 103.

[0082] Once all battery packs 103 are fully charged, the control module 101 waits for a period of time before sending an electrical signal to the voltage conversion module 102 to output electrical energy to the external device. Then, the voltage conversion module 102 can output the electrical energy input from each battery pack 103 to the external device, causing each battery pack 103 to discharge. At the same time, the control module 101 can continuously monitor the electrical energy parameters of each battery pack 103. When it is determined that all batteries in a battery pack 103 have discharged to a preset level, the control module 101 sends an electrical signal to the voltage conversion module 102 to stop the discharge of that battery pack 103.

[0083] Once all battery packs 103 have been discharged to the preset charge level, the control module 101 controls the voltage conversion module 102 to enter a sleep state or a shutdown state to complete the formation and capacity testing of each battery pack 103.

[0084] In this embodiment, the control module 101 can output an electrical signal to the voltage conversion module 102 to charge or discharge one or more specific battery packs 103; the control module 101 can also output an electrical signal to the voltage conversion module 102 to charge or discharge all battery packs 103 simultaneously. Specifically, adjustments can be made in real time according to instructions issued by an external terminal device, and this embodiment does not limit this.

[0085] In general, to avoid disorder in the power transmission between different battery packs 103, each battery pack 103 can be charged or only charged at the same time, and the situation of some battery packs 103 being charged and some battery packs 103 being discharged at the same time should be avoided as much as possible.

[0086] Optionally, the preset power level can be set by relevant technical personnel according to actual needs, or it can be set according to the parameters of each battery pack 103 and / or the circuit structure of the circuit 100. For example, the preset power level can be 0, and this embodiment of the application does not limit this.

[0087] In this embodiment, each battery pack 103 can be 2, 3, or any other possible number, which can be set according to actual needs, such as... Figure 1 The device can be configured with m battery packs 103. This application does not limit this.

[0088] Optionally, each battery pack 103 includes at least a plurality of batteries connected in series. Each battery can be a lithium battery, a lead-acid battery, and / or any other possible battery. That is, any possible number of individual batteries can be connected in series to form a battery pack 103, so that these series-connected individual batteries can be charged and discharged.

[0089] Generally, batteries with the same or similar specifications and parameters can be selected for series connection in the same battery pack 103. For example, multiple batteries with rated voltages of 3V, 5V or any other possible voltages can be selected for series connection to improve the uniformity and reliability of the battery pack 103 in terms of formation and capacity testing.

[0090] It is worth noting that when performing capacity testing on batteries, multiple batteries requiring capacity testing can be connected in series to form a battery pack 103. However, since the total voltage of a battery pack 103 is limited by the voltage of the voltage conversion module 102, if too many batteries are connected in series in a battery pack 103, the total voltage of that battery pack 103 will be too high, leading to an excessively high voltage at the connection point between the voltage conversion module 102 and the battery pack 103. This could potentially cause the individual batteries in the battery pack 103 to fail to fully charge or discharge, negatively impacting the effectiveness of capacity testing.

[0091] As can be understood from the above description, in the circuit 100 provided in the embodiments of this application, the control module 101 can control the voltage conversion module 102 to charge one or more battery packs 103 simultaneously, or control the voltage conversion module 102 to cause one or more battery packs 103 to discharge simultaneously. Moreover, each battery pack 103 can have multiple batteries connected in series. That is, the circuit 100 provided in the embodiments of this application can achieve the purpose of simultaneously charging or discharging each battery in multiple battery packs 103.

[0092] It should be noted that when circuit 100 is applied to perform capacity testing on batteries, it can not only connect multiple batteries requiring capacity testing in series to form a battery pack 103, but also connect multiple battery packs 103 in parallel. By controlling the voltage conversion module 102, multiple battery packs 103 can be charged or discharged simultaneously, so that capacity testing can be performed on each battery in multiple battery packs 103 at the same time. For example, if a battery pack 103 can have a maximum of n batteries connected in series under the limitation of the output voltage of the voltage conversion module 102, then by providing m battery packs 103, circuit 100 can perform capacity testing on n*m batteries simultaneously.

[0093] In this way, by providing multiple parallel battery packs 103, the circuit 100 can perform capacity testing on more batteries simultaneously without affecting the capacity testing effect.

[0094] In this way, circuit 100 can provide more battery storage space during capacity formation.

[0095] In one possible implementation, see [link to relevant documentation]. Figure 2 The voltage conversion module 102 includes: AC-DC 1021 and multiple DC-DC 1022.

[0096] The first terminal of AC-DC1021 is used to connect to the external device, and the second and third terminals of AC-DC1021 are connected to the first and second terminals of each DC-DC1022, respectively.

[0097] The third and fourth terminals of each DC-DC1022 are connected to the second and third terminals of each battery pack 103, respectively, and the fifth terminal of each DC-DC1022 is connected to the first output terminal of each control module 101.

[0098] Optionally, the AC-DC1021 can be a bidirectional converter, that is, the AC-DC1021 can convert DC power to AC power or AC power to DC power as needed.

[0099] Optionally, DC-DC1022 can be a bidirectional DC-DC converter, that is, DC-DC1022 can output the DC power input from AC-DC1021 to the battery pack 103 connected to DC-DC1022, or it can output the DC power input from the battery pack 103 to AC-DC1021.

[0100] Under normal circumstances, the number of each DC-DC1022 can be equal to the number of each battery pack 103, that is, each DC-DC1022 can be connected to each battery pack 103 in a one-to-one correspondence.

[0101] Specifically, AC-DC1021 is used to convert the first AC power input from the external device into a first DC power output to each DC-DC1022, and to convert the second DC power output from each DC-DC1022 into a second AC power output to the external device.

[0102] Optionally, the first AC power can be output to the AC-DC 1021 by the external device when the control module 101 sends an electrical signal to any DC-DC 1022 to charge the battery pack 103. The first AC power can be 220V, 50HZ, or other possible AC power with parameters determined by the parameters of the external device.

[0103] The first DC power can be obtained by converting the first AC power using AC-DC1021. The voltage of the first DC power can be greater than, equal to or less than the effective voltage of the first AC power. This application embodiment does not limit this.

[0104] Optionally, the second DC power can be output from any DC-DC 1022 to AC-DC 1021 when the control module 101 sends an electrical signal to any DC-DC 1022 to cause the battery pack 103 to discharge to the outside.

[0105] The second AC power can be obtained by converting the second DC power using an AC-DC converter 1021. The effective voltage of the second AC power can be greater than, equal to, or less than that of the second DC power. Generally, the parameters of the second AC power can be the same as those of the first AC power. This application does not limit this aspect.

[0106] Specifically, DC-DC1022 is used to convert the first DC power into a third DC power and output it to the battery pack 103 connected to DC-DC1022 under the action of the electrical signal, and to convert the fourth DC power output from the battery pack 103 into the second DC power and output it to AC-DC1021.

[0107] Optionally, DC-DC1022 can convert the first DC power into the third DC power under the action of an electrical signal used to charge the battery pack 103.

[0108] Optionally, DC-DC1022 can also convert the fourth DC power into the second DC power under the action of an electrical signal used to discharge the battery pack 103.

[0109] Furthermore, when the DC-DC converter 1022 outputs the third DC power to the battery pack 103, the DC-DC converter 1022 can charge the battery pack 103 in a constant current or constant voltage manner. Specifically, this can be determined by the electrical signal sent by the control module 101 and / or the instructions issued by the terminal device to the control module 101, and this application embodiment does not limit this.

[0110] Understandably, see Figure 2 If circuit 100 contains m battery packs 103, then voltage conversion module 102 can include m DC-DC converters 1022. When the terminal device sends a command to control module 101, it can specify which DC-DC converter 1022 should charge or discharge the corresponding battery pack 103. Control module 101 can then directly send corresponding electrical signals to one or more DC-DC converters 1022 specified by the terminal device, thereby causing the corresponding one or more battery packs 103 to discharge or charge.

[0111] It is worth noting that AC-DC converter 1021 and each DC-DC converter 1022 enable AC-DC conversion, allowing for normal power transfer between external devices and each battery pack 103, ensuring proper discharge of each battery pack 103. Furthermore, by assigning a corresponding DC-DC converter 1022 to each battery pack 103, circuit 100 avoids the problem of a single DC-DC converter 1022 simultaneously supporting multiple battery packs 103, which would reduce the number of batteries that can be connected in series in each battery pack 103. Thus, it provides as many battery storage locations as possible without affecting the formation and capacity testing effect.

[0112] In one possible implementation, Figure 2 Based on this, continue to see Figure 3 The DC-DC1022 includes a controller, a drive circuit, and a power circuit.

[0113] The first end of the controller is connected to the first end of the control module 101, the second end of the controller is connected to the first end of the drive circuit, and the second end of the drive circuit is connected to the first end of the power circuit.

[0114] The second and third terminals of the power circuit are connected to the second and third terminals of the AC-DC1021, respectively, and the fourth and fifth terminals of the power circuit are connected to the second and third terminals of the battery pack 103, respectively.

[0115] The controller is used to control the drive circuit to drive the power circuit under the action of the electrical signal. For example, the controller can analyze and identify the electrical signal, and then output a corresponding pulse width modulation (PWM) signal to the drive circuit based on the electrical signal to control the drive circuit.

[0116] The power circuit is used to convert the first DC power into the third DC power under the drive of the drive circuit, and to control the drive circuit to convert the fourth DC power into the second DC power.

[0117] Optionally, the controller may be a digital signal processing chip (DSP). This controller can control the drive circuit under the control of the aforementioned control module 101, or it can control the drive circuit based on the real-time operating conditions of the controller and / or the drive circuit. This application embodiment does not limit this aspect.

[0118] Generally, this controller can be used to control the drive circuit so that the power circuit outputs constant current or constant voltage. It can also obtain the electrical energy parameters of the battery pack 103 currently connected to the power circuit from the control module 101, so as to adjust the control method of the drive circuit and / or the output parameters of the power circuit in real time based on the electrical energy parameters of the battery pack 103. Furthermore, the controller may have any other possible functions, which are not limited in this embodiment.

[0119] Optionally, the power circuit can be any bidirectional circuit capable of implementing boost and / or buck.

[0120] For example, the power circuit can be a bidirectional Buck-Boost circuit. Moreover, the power circuit can be a full-bridge topology or a half-bridge topology, which can be selected according to actual needs.

[0121] Specifically, the power circuit may include multiple power switches, and the drive circuit can drive each power switch in the power circuit to turn on or off based on the PWM signal output by the controller. In practical applications, the drive circuit and the power circuit can be composed of any possible devices, as long as they can achieve the corresponding functions. This application does not limit this.

[0122] In this way, the purpose of converting the first DC power to the third DC power and outputting it to the battery pack 103 connected to the drive circuit can be achieved, as well as the purpose of converting the fourth DC power to the second DC power and outputting it to the AC-DC 1021 can be achieved.

[0123] In one possible implementation, the battery pack 103 includes a plurality of batteries connected in series.

[0124] The positive terminal of the first battery in each battery is connected to the second terminal of the voltage conversion module 102, and the negative terminal of the last battery in each battery is connected to the third terminal of the voltage conversion module 102.

[0125] The positive terminal of the nth battery is connected to the negative terminal of the (n-1)th battery.

[0126] The positive or negative terminal of each battery is connected to the first input terminal of the control module 101.

[0127] Specifically, the control module 101 is used to detect the electrical energy parameters of each battery in each battery pack 103.

[0128] In this embodiment, the first battery in each battery can be a battery whose positive terminal is not connected to other batteries; the last battery in each battery can be a battery whose negative terminal is not connected to other batteries.

[0129] Optionally, n is a positive integer greater than 1. That is, the positive terminal of each battery, except for the first and last batteries, is connected to the negative terminal of the adjacent battery.

[0130] For example, see Figure 4 , Figure 4 Taking one of the battery packs 103 as an example, the connection relationship of each battery in the battery pack 103 is shown. It can be seen that the battery pack 103 may include a total of n batteries, such as battery C1, battery C2, ..., battery Cn-1, and battery Cn. Battery C1 is the first battery, and its positive terminal is connected to the second terminal of the voltage conversion module 102. Battery Cn is the last battery, and its positive terminal is connected to the third terminal of the voltage conversion module 102. Batteries C2, ..., and battery Cn-1 are connected sequentially.

[0131] Specifically, the control module 101 can detect the positive terminal voltage, negative terminal voltage, positive electrode tab voltage, and / or negative electrode tab voltage of any battery. If the positive terminal of a battery is connected to the first input terminal of the control module 101, the control module 101 can be used to detect the positive terminal voltage and / or positive electrode tab voltage of that battery; if the negative terminal of a battery is connected to the first input terminal of the control module 101, the control module 101 can be used to detect the negative terminal voltage and / or negative electrode tab voltage of that battery. Moreover, when detecting the electrode tab voltage, it can also be detected by corresponding probes. This application embodiment does not limit this aspect.

[0132] Generally, the positive terminals of each battery can be connected to the first input terminal of the control module 101, or the negative terminals of each battery can be connected to the first input terminal of the control module 101. This minimizes the risk of misidentification by the control module 101 due to some batteries having their negative terminals connected to the first input terminal while others have their positive terminals connected to the first input terminal, thus ensuring the accuracy and reliability of the control module 101 in detecting electrical energy parameters.

[0133] It is worth noting that after detecting the electrical energy parameters of a battery, the control module 101 can determine the battery's charge level based on these parameters, and then determine whether the battery has finished charging or discharging. This allows the control module 101 to understand the current progress of the capacity formation process and perform other corresponding processing or control.

[0134] In one possible implementation, the battery pack 103 further includes a plurality of first switches, the number of which is equal to the number of batteries.

[0135] Each first switch is connected between the positive and negative terminals of each battery.

[0136] The control terminal of each first switch can be connected to each of the second output terminals of the control module 101.

[0137] Each first switch is configured to be turned on under the control of the control module 101, thereby disconnecting the battery corresponding to each first switch from other batteries. Each first switch is also configured to be turned off under the control of the control module 101, thereby connecting the battery corresponding to each first switch in series with other batteries.

[0138] Optionally, the first switch can be any possible controllable switch, such as a corresponding switching transistor (e.g., MOSFET, IGBT, etc.) or an auxiliary contact of a relay. This application does not limit this.

[0139] It is understood that the battery corresponding to the first switch refers to a battery whose positive and negative terminals are respectively connected to this first switch. For example, see... Figure 5 , Figure 5 Taking one of the battery packs 103 as an example, the connection relationship between each battery and each first switch in the battery pack 103 is shown. It can be seen that the battery pack 103 may include n batteries, such as battery C1, battery C2, ..., battery Cn-1, battery Cn, and n first switches, such as first switch Q1, first switch Q2, ..., first switch Qn-1, first switch Qn, and so on. It can be seen that first switch Q1 is connected between the positive and negative terminals of battery C1, first switch Q2 is connected between the positive and negative terminals of battery C2, ..., and first switch Qn is connected between the positive and negative terminals of battery Cn. That is, the battery corresponding to each first switch Q1 is battery C1, ... and the battery corresponding to each first switch Qn is battery Cn.

[0140] It is worth noting that since the control module 101 can also determine the charge level of each battery based on its electrical energy parameters, and thus determine whether each battery has completed charging or discharging, the control module 101 can, upon determining that a particular battery in a battery pack 103 has completed charging or discharging, control the first switch corresponding to that battery to turn on, thereby switching that battery out of the battery pack 103. This continues until the control module 101 determines that all batteries in the battery pack 103 have completed charging or discharging, at which point it turns off the previously turned-on first switch to allow for subsequent operations. Because there is inevitably some error between the batteries in the same battery pack 103, some batteries may complete charging or discharging earlier than others. By switching each battery on and off using the first switches, over-discharging or over-charging problems can be avoided as much as possible, thereby improving the safety of charge / discharge control and / or capacity forming.

[0141] In addition, the control module 101 can also determine whether each battery is abnormal based on its electrical energy parameters. For example, if the rated parameters of a certain battery are much greater or less than the rated parameters of other batteries, the first switch corresponding to that battery can be turned on, thereby switching that battery out of the battery pack 103. In this way, the problem of damage to each battery can be avoided as much as possible, thereby improving the safety of charge and discharge control and / or capacity formation.

[0142] In one possible implementation, see [link to relevant documentation]. Figure 6 The battery pack 103 also includes a voltage acquisition unit 1031.

[0143] Each acquisition terminal of the voltage acquisition unit 1031 is connected to the positive or negative terminal of each battery, and the output terminal of the voltage acquisition unit 1031 is connected to the first input terminal of the control module 101.

[0144] The voltage acquisition unit 1031 is used to acquire the voltage value of each battery and output the voltage value to the control module 101.

[0145] Optionally, the voltage acquisition unit 1031 can be any device capable of voltage acquisition, such as a voltage acquisition box. The number of acquisition terminals of the voltage acquisition unit 1031 is greater than or equal to the number of each battery in the battery pack 103.

[0146] Specifically, the voltage acquisition unit 1031 can detect the voltage of each battery in the battery pack 103, and generate a digital signal that the control module 101 can recognize based on the voltage of each battery, so as to transmit the digital signal to the first input terminal of the control module 101. In this way, the control module 101 can accurately detect the electrical energy parameters of each battery in the battery pack 103, so that the control module 101 can control the first switch and / or voltage conversion module 102.

[0147] In one possible implementation, see [link to previous section] Figure 6 The circuit 100 also includes: multiple voltage adjustment units 104.

[0148] Each voltage adjustment unit 104 is connected between the voltage conversion module 102 and each battery pack 103.

[0149] Each voltage adjustment unit 104 is used to increase the voltage of the DC power output from each battery pack 103 to the voltage conversion module 102 under the control of the voltage conversion module 102.

[0150] Optionally, the voltage adjustment unit 104 can be any circuit or device capable of boosting voltage. For example, the voltage adjustment unit 104 can be a boost circuit or a voltage booster.

[0151] Optionally, each voltage adjustment unit 104 can be controlled by a DC-DC 1022 connected to each voltage adjustment unit 104 in the voltage conversion module 102, specifically by a controller in the DC-DC 1022.

[0152] Under normal circumstances, each voltage adjustment unit 104 is either disabled or in a dormant state when the voltage conversion module 102 is charging the battery pack 103, at which time each voltage adjustment unit 104 acts as a wire. When the battery pack 103 discharges to the aforementioned external device through the voltage conversion module 102, each voltage adjustment unit 104 is enabled or enters a working state under the control of the voltage conversion module 102, at which time each voltage adjustment unit 104 can increase the voltage of the DC power output from the battery pack 103 to the voltage conversion module 102.

[0153] It is worth noting that, since the DC-DC1022 is bidirectional, the voltage on the side connected to the battery pack 103 is generally lower than the voltage on the side connected to the AC-DC1021. In this case, the DC-DC1022 can transfer the electrical energy output from the AC-DC1021 to the battery pack 103. Even if the battery pack 103 gradually increases its voltage during charging, the voltage on the side connected to the DC-DC1022 and the battery pack 103 generally will not exceed the voltage on the side connected to the AC-DC1021.

[0154] Therefore, by setting a voltage adjustment unit 104 in the circuit 100, the voltage adjustment unit 104 can increase the DC voltage output by each battery pack 103 to the voltage conversion module 102 when the battery pack 103 needs to output voltage to the DC-DC 1022, so as to assist the battery pack 103 in discharging. In this way, each battery in each battery pack 103 can be discharged as much as possible or completely discharged, thereby improving the formation and capacity setting effect.

[0155] In one possible implementation, circuit 100 further includes a plurality of second switches.

[0156] Each second switch is connected between the voltage conversion module 102 and each battery pack 103.

[0157] Each second switch is used to turn on or off under the control of the control module 101 to connect or disconnect the power transmission path between the voltage conversion module 102 and each battery pack 103.

[0158] Optionally, the second switch can be any possible controllable switch, such as an auxiliary contact of a relay or contactor. This application does not limit this.

[0159] Optionally, the power transmission path refers to the connection line between the voltage conversion module 102 and each battery pack 103, so as to transmit the fourth DC power output from the battery pack 103 to the voltage conversion module 102 and output the aforementioned third DC power to the battery pack 103.

[0160] For example, the control module 101 may also be provided with a second output terminal, and each second output terminal of the control module 101 is connected to each second switch respectively, so as to control the second switch to be turned on or off through the third output terminal of the control module 101. This application embodiment does not limit this.

[0161] See also Figure 6 , Figure 6The diagram also illustrates a possible connection relationship for the second switches in circuit 100. It can be seen that circuit 100 may include m second switches, such as second switch S1, second switch S2, ..., second switch Sm. Furthermore, the number of each second switch is the same as the number of battery packs 103, meaning each second switch corresponds to one battery pack 103 and one DC-DC converter 1022.

[0162] Specifically, the control module 101 can control each second switch to turn off when any possible device in the circuit 100 fails or malfunctions, so as to avoid damage to each battery in each battery pack 103 or affect the formation and capacity-building effect due to failure or malfunction of the circuit 100.

[0163] In addition, when the control module 101 detects that the circuit 100 is normal and that it is necessary to perform capacity testing on any battery in the battery pack 103 (after receiving the instruction from the terminal device that capacity testing is required), the control module 101 controls the second switch corresponding to the battery pack 103 that needs to be performed capacity testing to be turned on, so as to ensure that the battery pack 103 can output the fourth DC power to the voltage conversion module 102 and / or the voltage conversion module 102 can output the third DC power to the battery pack 103, so as to complete the capacity testing operation of each battery.

[0164] In one possible implementation, the control module 101 can also be used to detect leakage current in the circuit 100, and to control the voltage conversion module to stop and / or control the second switch corresponding to the voltage conversion module 102 to turn off when the leakage current is greater than a preset threshold.

[0165] Optionally, the leakage current may refer to the leakage current flowing through the voltage conversion module 102 to each battery pack 103, or the leakage current flowing from each battery pack 103 to the voltage conversion module 102.

[0166] For example, the control module 101 may also have second input terminals. Each second input terminal of the control module 101 may be connected to the AC-DC 1021 in the voltage conversion module 102 (connected to both ends of the AC-DC 1021) to detect the leakage current flowing through the AC-DC 1021; each second input terminal of the control module 101 may also be connected to the DC-DC 1022 in the voltage conversion module 102 (connected to both ends of the DC-DC 1022) to detect the leakage current flowing through the DC-DC 1022; each second input terminal of the control module 101 may also be connected between the DC-DC 1022 and the battery pack 103 to detect the leakage current flowing to or from the battery pack 103. This application embodiment does not limit this aspect.

[0167] Optionally, the preset threshold can be set by relevant technical personnel according to actual needs, and this application embodiment does not limit this.

[0168] Under normal circumstances, if the leakage current is greater than the preset threshold, it indicates that the current AC-DC1021 and / or DC-DC1022 has malfunctioned, causing the battery pack 103 to continuously discharge to the outside or the external device to continuously charge the battery pack 103, which may lead to overcharging or over-discharging of the battery in the battery pack 103.

[0169] Therefore, when the leakage current exceeds the preset threshold, the control module 101 can also control the AC-DC 1021 and / or DC-DC 1022 to shut down or stop operating, thereby causing the voltage conversion module 102 to stop. For example, the control module 101 can also be provided with a third output terminal, which is connected to the AC-DC 1021, so as to control the AC-DC 1021 to shut down or stop operating through the third output terminal of the control module 101. This application embodiment does not limit this.

[0170] Furthermore, when the leakage current is greater than the preset threshold, the control module 101 can also control the second switch corresponding to the voltage conversion module 102 to turn off, that is, it can control all the second switches to turn off.

[0171] This approach minimizes the risk of leakage current caused by malfunctions in the AC-DC 1021 and / or DC-DC 1022 of the voltage conversion module 102, which could lead to continuous charging of the battery pack 103 by external devices or continuous discharging of the battery pack 103 to external devices via the voltage conversion module 102. This, in turn, helps prevent overcharging or over-discharging of the batteries in the battery pack 103, thereby improving the safety of the circuit 100.

[0172] In one possible implementation, the control module 101 may include a processing unit and a host computer.

[0173] The processing unit may include the aforementioned MCU and / or ARM, for directly controlling other devices, units, or modules in circuit 100.

[0174] The intermediate unit can be connected to the processing unit and the aforementioned terminal device respectively, and then forward the instructions issued by the terminal device to the processing unit, and / or report the power parameters or other data detected by the processing unit to the terminal device.

[0175] In this way, the terminal device can be connected to multiple intermediate units to control multiple circuits 100 respectively.

[0176] Based on the foregoing embodiments, this application provides a formulation and capacity-saving system. Figure 7 This is a schematic diagram of a formation and capacity-deploying system provided in an embodiment of this application. See also... Figure 7 The capacity-forming system X may include at least the charge / discharge control circuit 100 provided in any of the above embodiments.

[0177] Optionally, the formulation and capacity system X may also include the aforementioned external devices.

[0178] Optionally, the formulation and capacity system X may also include the aforementioned terminal devices, which may include, but are not limited to, mobile phones, computers, tablets, servers, and any other possible devices.

[0179] The description of the above embodiments of the formation and capacity control system X is similar to the description of the above embodiments of the charge and discharge control circuit 100. That is, the formation and capacity control system X and the charge and discharge control circuit 100 provided in this application belong to the same design concept and have similar beneficial effects as the above embodiments of the charge and discharge control circuit 100. For technical details not disclosed in the device embodiments of this application, please refer to the description of the method embodiments of this application for understanding.

[0180] Those skilled in the art will understand that Figure 7 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the formulation and capacity system to which the present application is applied. A specific formulation and capacity system may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0181] It should be understood that the phrases "one embodiment," "an embodiment," or "some embodiments" mentioned throughout the specification mean that a specific feature, structure, or characteristic related to an embodiment is included in at least one embodiment of this application. Therefore, "in one embodiment," "in one embodiment," or "in some embodiments" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. It should be understood that in the various embodiments of this application, the sequence numbers of the above-described processes do not imply a sequential order of execution; the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application. The sequence numbers of the above-described embodiments are merely for descriptive purposes and do not represent the superiority or inferiority of the embodiments. The descriptions of the various embodiments above tend to emphasize the differences between the various embodiments; their similarities or commonalities can be referred to mutually, and for the sake of brevity, they will not be repeated here.

[0182] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that there can be three kinds of relationships. For example, object A and / or object B can represent three situations: object A exists alone, object A and object B exist simultaneously, and object B exists alone.

[0183] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0184] The circuits 100 disclosed in the embodiments of the circuits 100 provided in this application can be arbitrarily combined without conflict to obtain new embodiments of the circuits 100.

[0185] The above description is merely an embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0186] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A charging and discharging control circuit, characterized in that, The circuit includes: a control module (101), a voltage conversion module (102), and multiple battery packs (103), each of the battery packs (103) including at least multiple batteries connected in series. Each first output terminal of the control module (101) is connected to each first terminal of the voltage conversion module (102), and each first input terminal of the control module (101) is connected to the first terminal of each battery pack (103). The second and third terminals of the voltage conversion module (102) are respectively connected to the second and third terminals of the battery pack (103), and the voltage conversion module (102) is also used to connect to external devices; The control module (101) is used to detect the electrical energy parameters of each of the battery packs (103) and to output electrical signals to the voltage conversion module (102). The electrical energy parameters include voltage values ​​and / or current values. The voltage conversion module (102) is used to charge each of the battery packs (103) and to discharge each of the battery packs (103) to the external device through the voltage conversion module (102) under the action of the electrical signal output by the control module (101).

2. The charging and discharging control circuit as described in claim 1, characterized in that, The voltage conversion module (102) includes: an AC-DC conversion unit (1021) and multiple DC-DC conversion units (1022); The first end of the AC-DC converter (1021) is used to connect to the external device, and the second and third ends of the AC-DC converter (1021) are respectively connected to the first and second ends of each DC-DC converter (1022); The third and fourth terminals of each DC-DC converter (1022) are respectively connected to the second and third terminals of each battery pack (103), and the fifth terminal of each DC-DC converter (1022) is respectively connected to each first output terminal of the control module (101). The AC-DC conversion unit (1021) is used to convert the first AC power input from the external device into a first DC power output to each of the DC-DC conversion units (1022), and to convert the second DC power output from each of the DC-DC conversion units (1022) into a second AC power output to the external device. The DC-DC converter (1022) is used to convert the first DC power into a third DC power and output it to the battery pack (103) connected to the DC-DC converter (1022) under the action of the electrical signal, and to convert the fourth DC power output by the battery pack (103) into a second DC power and output it to the AC-DC converter (1021).

3. The charging and discharging control circuit as described in claim 2, characterized in that, The DC-DC conversion unit (1022) includes: a controller, a drive circuit, and a power circuit; The first end of the controller is connected to the first end of the control module (101), the second end of the controller is connected to the first end of the drive circuit, and the second end of the drive circuit is connected to the first end of the power circuit. The second and third terminals of the power circuit are connected to the second and third terminals of the AC-DC conversion unit (1021), respectively, and the fourth and fifth terminals of the power circuit are connected to the second and third terminals of the battery pack (103), respectively. The controller is used to control the drive circuit to drive the power circuit under the action of the electrical signal; The power circuit is used to convert the first DC power into the third DC power under the drive of the drive circuit, and to control the drive circuit to convert the fourth DC power into the second DC power.

4. The charging and discharging control circuit as described in claim 1, characterized in that, The battery pack (103) includes: the plurality of batteries connected in series; The positive terminal of the first battery in each of the batteries is connected to the second terminal of the voltage conversion module (102), and the negative terminal of the last battery in each of the batteries is connected to the third terminal of the voltage conversion module (102). The positive terminal of the nth battery in each of the batteries is connected to the negative terminal of the (n-1)th battery, where n is a positive integer greater than 1; The positive or negative terminal of each battery is connected to the first input terminal of the control module (101); Specifically, the control module (101) is used to detect the electrical energy parameters of each battery in each of the battery packs (103).

5. The charge / discharge control circuit as described in claim 4, characterized in that, The battery pack (103) further includes: a plurality of first switches, the number of each first switch being equal to the number of each battery; Each of the first switches is connected between the positive and negative terminals of each of the batteries; The control terminal of each of the first switches is connected to each of the second output terminals of the control module (101); Each of the first switches is used to be turned on under the control of the control module (101), so that the battery corresponding to each of the first switches is disconnected from other batteries.

6. The charge / discharge control circuit as described in claim 1, characterized in that, The battery pack (103) also includes: a voltage acquisition unit (1031); Each acquisition terminal of the voltage acquisition unit (1031) is connected to the positive or negative terminal of each battery, and the output terminal of the voltage acquisition unit (1031) is connected to the first input terminal of the control module (101). The voltage acquisition unit (1031) is used to acquire the voltage value of each battery and output the voltage value to the control module (101).

7. The charge / discharge control circuit according to any one of claims 1-6, characterized in that, The circuit also includes: a plurality of second switches; Each of the second switches is connected between the voltage conversion module (102) and each of the battery packs (103); Each of the second switches is used to turn on or off under the control of the control module (101) to connect or disconnect the power transmission path between the voltage conversion module (102) and each of the battery packs (103).

8. The charge / discharge control circuit according to any one of claims 1-6, characterized in that, The circuit also includes: multiple voltage adjustment units (104); Each of the voltage adjustment units (104) is connected between the voltage conversion module (102) and each of the battery packs (103); Each of the voltage adjustment units (104) is used to increase the voltage of the DC power output from each of the battery packs (103) to the voltage conversion module (102) under the control of the voltage conversion module (102).

9. The charge / discharge control circuit according to any one of claims 1-6, characterized in that, The control module (101) is also used to detect leakage current in the circuit, and to control the voltage conversion module (102) to stop when the leakage current is greater than a preset threshold, and / or control the second switch corresponding to the voltage conversion module (102) to turn off.

10. A formulation and compatibility system, characterized in that, The system includes at least the charge / discharge control circuit as described in any one of claims 1 to 9.

Images