CN215452553U - Charge-discharge control circuit, power supply and electric equipment of battery pack - Google Patents
Charge-discharge control circuit, power supply and electric equipment of battery pack Download PDFInfo
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- CN215452553U CN215452553U CN202121976041.6U CN202121976041U CN215452553U CN 215452553 U CN215452553 U CN 215452553U CN 202121976041 U CN202121976041 U CN 202121976041U CN 215452553 U CN215452553 U CN 215452553U
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Abstract
The embodiment of the application discloses charge-discharge control circuit, power and consumer of group battery relates to battery charge-discharge technical field. Wherein, the charge and discharge control circuit of group battery includes: the battery pack charging method comprises a collecting unit, a control unit, a charging input unit and a supplementing unit, wherein when a first target battery with cut-off discharge is determined from the battery pack based on discharge data, the battery pack is charged uniformly, in the process of charging the battery pack uniformly, a second target battery with the charging completed is determined from the battery pack based on the charging data, a loop between the charging input unit and the first target battery is conducted by the supplementing unit to form a supplementing charging loop, and the supplementing charging loop carries out supplementing charging on the first target battery by using a second charging current.
Description
Technical Field
The application belongs to the technical field of battery charging and discharging, and particularly relates to a charging and discharging control circuit of a battery pack, a power supply and electric equipment.
Background
Many conventional electronic products are equipped with rechargeable battery packs that can be repeatedly charged and used, such as terminals and smart wearable devices. In order to realize overcharge protection and overdischarge protection for a battery pack, in the prior art, a corresponding charge and discharge control circuit is configured on the periphery of the battery pack to monitor the charge condition and the discharge condition of the battery pack, and then whether the overcharge protection or the overdischarge protection is realized for the battery pack is judged according to the monitored data.
However, for each single battery in the battery pack, the battery pack after series and parallel connection presents various inconsistencies due to differences among the single batteries, such as capacity differences, internal resistance differences, voltage platform differences, polarization differences, self-discharge rate differences, and the like. With the use of the battery pack, the difference between the single batteries in the battery pack becomes larger and larger, and the available capacity is greatly reduced, so that the cycle life of the whole battery pack is greatly shortened. Therefore, when the charging and discharging control circuit is configured for the battery pack in the prior art, the charging and discharging control circuit of the battery pack has the problem of single function.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides a charge and discharge control circuit, a power supply and electric equipment of a battery pack, so as to solve the problem that the charge and discharge control circuit of the battery pack in the prior art has single function.
In a first aspect, an embodiment of the present application provides a charge and discharge control circuit of a battery pack, which is connected to the battery pack, and the charge and discharge control circuit includes:
the acquisition unit is connected with each battery in the battery pack and is used for acquiring the discharge data and the charge data of each battery in the battery pack;
the control unit is connected with the acquisition unit and used for outputting a uniform charging control signal when a first target battery with cut-off discharging is determined from the battery pack based on the discharging data and outputting a supplementary charging control signal and a path control signal when a second target battery with finished charging is determined from the battery pack based on the charging data;
the charging input unit is connected with the battery pack and the control unit respectively, and is used for outputting a first charging current to uniformly charge the battery pack according to the commercial power when receiving a uniform charging control signal and outputting a second charging current according to the commercial power when receiving a complementary charging control signal;
the supplementary unit is connected with the battery pack, the charging input unit and the control unit respectively, and is used for conducting a loop between the charging input unit and the first target battery according to the access control signal to form a supplementary charging loop when receiving the access control signal; the supplementary charging loop is used for supplementary charging the first target battery by taking the second charging current as the first target battery.
In a second aspect, an embodiment of the present application further provides a power supply, which includes a battery pack and a charging and discharging control circuit of the battery pack in the first aspect.
In a third aspect, an embodiment of the present application further provides an electric device, including the power supply in the second aspect.
The embodiment of the application provides charge-discharge control circuit, power and consumer of group battery, and wherein, the charge-discharge control circuit of group battery links to each other with the group battery, includes: the battery pack charging system comprises a collection unit, a control unit, a charging input unit and a supplement unit, wherein the collection unit is connected with each battery in the battery pack, the control unit is connected with the collection unit, the charging input unit is connected with a mains supply and is also respectively connected with the battery pack and the control unit, and the supplement unit is respectively connected with the battery pack, the charging input unit and the control unit. The method comprises the steps that a collection unit is used for collecting discharge data and charge data of each battery in a battery pack, a control unit determines a first target battery with cut-off discharge from the battery pack based on the discharge data in the discharging process of the battery pack, a unified charge control signal is output, when the unified charge control signal is transmitted to a charge input unit, the charge input unit can output a first charge current according to commercial power to carry out unified charge on the battery pack, in the charging process of the battery pack, the control unit determines a second target battery with finished charge from the battery pack based on the charge data, a supplementary charge control signal and a channel control signal are output, when the charge input unit receives the supplementary charge control signal, a second charge current is output according to the commercial power, and when the channel control signal is received, a loop between the charge input unit and the first target battery is conducted according to the channel control signal, and forming a supplementary charging loop, and further performing supplementary charging on the first target battery by using the second charging current through the supplementary charging loop. In the discharging process of the battery pack, once the first target battery with cut-off discharging is determined from the battery pack based on the discharging data, the discharging operation of the battery pack is immediately stopped and the battery pack is uniformly charged, so that the phenomenon of over-discharging of the battery pack is avoided; meanwhile, in the process of uniformly charging the battery pack, once a second target battery which is charged is determined from the battery pack based on charging data, the uniform charging operation of the battery pack is immediately stopped, a circuit between the charging input unit and the first target battery is conducted by using the supplementing unit to form a supplementing charging circuit, and then the supplementing charging circuit is used for supplementing charging the first target battery by using a second charging current, so that the over-discharge protection and the over-charge protection of the battery pack are realized, and simultaneously, the batteries in the battery pack tend to be balanced after being charged and discharged for many times in a supplementing charging mode, and the service life of the battery pack can be prolonged.
In addition, the first target battery is continuously subjected to complementary charging after the battery pack is uniformly charged, the charging and discharging times of the first target battery are not consumed, and for other single batteries except the first target battery in the battery pack, an external discharging circuit is not required to be added for discharging, so that the charging and discharging balance of all the single batteries in the battery pack can be realized after the multiple discharging, uniform charging and complementary charging of all the single batteries in the battery pack under the condition that the charging and discharging cycle times of all the batteries in the battery pack are not increased, the electric storage trend of the single batteries is maximized, full charge and full discharge of all the single batteries in the battery pack can be realized, and the overall utilization rate of the battery pack is improved.
Drawings
In order to more clearly illustrate the technical solutions of 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 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 structural diagram of a charge and discharge control circuit of a battery pack according to an embodiment of the present disclosure;
fig. 2 is a first specific structural diagram of a charge and discharge control circuit of a battery pack according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram of a specific structure of a charge and discharge control circuit of a battery pack according to an embodiment of the present disclosure;
fig. 4 is a circuit diagram illustrating a connection between a switch circuit and a battery pack in a charging/discharging control circuit of the battery pack according to an embodiment of the present disclosure;
FIG. 5 is a schematic diagram of a power supply according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of an electric device according to an embodiment of the present application.
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.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a charge and discharge control circuit of a battery pack according to an embodiment of the present disclosure. As shown in fig. 1, a charge and discharge control circuit 100 of a battery pack is connected to a battery pack 110, and is configured to be externally connected to a utility power 120 to charge the battery pack 110, and the charge and discharge control circuit 100 of the battery pack includes: the system comprises an acquisition unit 10, a control unit 20, a charging input unit 30 and a supplementing unit 40. Specifically, the method comprises the following steps:
and the acquisition unit 10 is connected with each battery in the battery pack 110 and is used for acquiring the discharge data and the charge data of each battery in the battery pack 110.
And a control unit 20 connected to the collecting unit 10, wherein the control unit 20 is configured to output a uniform charging control signal when a first target battery with cut-off discharge is determined from the battery pack 110 based on the discharge data, and output a supplementary charging control signal and a path control signal when a second target battery with complete charging is determined from the battery pack 110 based on the charging data.
The charging input unit 30 connected to the utility power 120 is connected to the battery pack 110 and the control unit 20, respectively, and is configured to output a first charging current according to the utility power 120 to charge the battery pack 110 uniformly when receiving the uniform charging control signal, and output a second charging current according to the utility power 120 when receiving the supplementary charging control signal.
A supplementary unit 40 connected to the battery pack 110, the charging input unit 30, and the control unit 20, respectively, the supplementary unit 40 being configured to, upon receiving the path control signal, turn on a circuit between the charging input unit 30 and the first target battery according to the path control signal to form a supplementary charging circuit; the supplementary charging loop is used for supplementary charging the first target battery by taking the second charging current as the first target battery.
In the present embodiment, the collecting unit 10 collects data of the charging and discharging process of each battery in the battery pack 110, that is, when the battery pack 110 is charged, the collecting unit 10 collects charging data of each battery in the battery pack 110, and when the battery pack 110 is discharged, the collecting unit 10 collects discharging data of each battery in the battery pack 110. The collection unit 10 transmits the collected discharge data and charge data of each battery to the control unit 20. The control unit 20 receives the charge data and the discharge data of each battery collected by the collection unit 10, outputs a unified charge control signal if the control unit 20 determines a first target battery whose discharge is cut off from the battery pack 110 based on the discharge data, and outputs a supplementary charge control signal and a path control signal if the control unit 20 determines a second target battery whose charge is completed from the battery pack 110 based on the charge data. Here, the first target battery that is cut off in discharging is a single battery that has been cut off in discharging of the battery pack 110 in a single discharging process, and the second target battery that is completed in charging is a single battery that has been completed in charging of the battery pack 110 in a single charging process. During the multiple discharging processes of battery pack 110, the first target battery determined by different discharging processes may be different single batteries in battery pack 110, and accordingly, during the multiple charging processes of battery pack 110, the second target battery determined by each charging process may also be different single batteries in battery pack 110.
It should be noted that, during the discharging process of the battery pack 110, the collecting unit 10 collects the discharging data of each battery in the battery pack 110 and sends the discharging data to the control unit 20. When the control unit 20 determines the first target battery whose discharge is cut off from the battery pack 110 based on the discharge data, it is determined that the first target battery in the battery pack 110 has failed to perform the discharging operation, and the control unit 20 outputs the unified charging control signal. Here, the control unit 20 outputs the unified charging control signal when the first target battery whose discharge is cut off is determined from the battery pack 110 based on the discharge data, in order to output the unified charging control signal with the occurrence of the first target battery whose discharge is cut off as the timing to stop the discharge, and also to be able to stop the discharging operation of the battery pack. When receiving the unified charging control signal, the charging input unit 30 outputs a first charging current according to the utility power 120 to uniformly charge the battery pack 110. Here, the charging input unit 30 outputs the first charging current to uniformly charge the battery pack 110, which means that the entire battery pack 110 is charged. In all embodiments, the battery pack 110 may be a battery pack formed by connecting a plurality of single batteries in series, or may be a battery pack formed by connecting a plurality of single batteries in parallel, and is not limited herein.
In the process of charging the battery pack 110, the acquisition unit 10 acquires charging data of each battery in the battery pack 110 and transmits it to the control unit 20. Here, the process of charging the battery pack 110 refers to a process of uniformly charging the battery pack 110.
When the control unit 20 determines the second target battery that is completely charged from the battery pack 110 based on the charging data, it may determine that the second target battery is completely charged, that is, the second target battery in the battery pack 110 does not need to be charged, and the control unit 20 outputs the supplementary charging control signal and the path control signal. Here, the control unit 20 outputs the supplementary charging control signal and the path control signal when the second target battery whose charging is completed is determined from the battery pack 110 based on the charging data, in order to output the supplementary charging control signal and the path control signal at the timing at which the unified charging is stopped at which the second target battery whose charging is completed appears, while being capable of stopping the unified charging operation for the battery pack. When receiving the supplementary charging control signal, the charging input unit 30 outputs a second charging current according to the commercial power 120, and when receiving the path control signal, the supplementary unit 40 switches on a loop between the charging input unit 30 and the first target battery according to the path control signal to form a supplementary charging loop, so as to perform supplementary charging on the first target battery through the supplementary charging loop by using the second charging current.
In implementation, the acquisition unit 10 may be a circuit unit formed by combining a plurality of sensors, and the plurality of sensors detect each battery in the battery pack 110 and transmit discharge data generated during discharging of each battery and charge data generated during charging of each battery to the control unit 20.
As one example, the acquisition unit 10 may include at least one of a current sensor, a voltage sensor, and a temperature sensor. Correspondingly, the discharge data of each battery may include at least one of a discharge current, a discharge voltage, and a discharge temperature of each battery, and the charge data of each battery may include at least one of a charge current, a charge voltage, and a charge temperature of each battery.
As a possible implementation manner of this embodiment, the control unit 20 may be a functional unit with data processing and control capabilities, such as a single chip unit, or a unit with data processing and control capabilities composed of a single chip and an external circuit.
In connection with the above example, control unit 20 outputs the unified charging control signal when determining the first target battery for which discharge is cut off from battery pack 110 based on the discharge data, and may output the unified charging control signal when determining the first target battery for which discharge is cut off from battery pack 110 based on at least one of the discharge current, the discharge voltage, and the discharge temperature of each battery. The control unit 20 outputs the supplementary charging control signal and the path control signal when the second target battery whose charging is completed is determined from the battery pack 110 based on the charging data, and may output the supplementary charging control signal and the path control signal when the second target battery whose charging is completed is determined from the battery pack 110 based on at least one of the charging current, the storage voltage, and the charging temperature of each battery.
As an example, the battery pack 110 includes N batteries, and the N batteries are connected in series, where N is an integer greater than 1; the acquisition unit 10 includes N pairs of acquisition ends, each pair of acquisition ends is connected with the positive negative pole of each battery, and the acquisition unit 10 is specifically used for acquiring the discharge voltage of each battery in the discharge process and the storage voltage of each battery in the charging process.
In this embodiment, when determining, based on the discharge data, that the first target battery whose discharge is cut off is determined from the battery pack 110, and determining, based on the charge data, that the second target battery whose charge is completed is determined from the battery pack 110, the control unit 20 may specifically be: when receiving the discharge voltage of each battery in the battery pack 110 collected by the collecting unit 10, the control unit 20 compares the discharge voltage of each battery with a preset cut-off discharge threshold, and when the discharge voltage of a battery is equal to or less than the preset cut-off discharge threshold, the battery can be used as the first target battery. Correspondingly, when receiving the storage voltage of each battery in the battery pack 110 collected by the collecting unit 10, the control unit 20 compares the charging data of each battery with a preset charging completion threshold, and when the storage voltage of a battery is equal to or greater than the preset charging completion threshold, the battery can be used as the second target battery.
It will be readily appreciated that the control unit 20 may be a unit with data processing and control capabilities based on an existing microprocessor chip in combination with its peripheral circuits. In specific implementation, an independent microprocessor chip may be selected according to actual requirements, or a processor chip of a device in which the multiplexing battery pack is located may be used as the control unit 20 in this embodiment, so specific selection or configuration of the control unit 20 is not described herein again.
In all embodiments of the present application, since the charging input unit 30 outputs a first charging current according to the commercial power 120 to uniformly charge the battery pack 110 when receiving the uniform charging control signal, and outputs a second charging current according to the commercial power 120 when receiving the complementary charging control signal, where the first charging current is used to uniformly charge the battery pack 110, and the second charging current is used to complementarily charge the first target battery through the complementary charging loop, and the first charging current is greater than the second charging current because the first target battery is a single battery in the battery pack 110.
Here, the first target battery is a single battery in the battery pack 110, refers to a certain battery in the battery pack 110, and is not limited to the number of the first target batteries. In some embodiments, the first target battery may be two or more discharge-cut batteries in the battery pack 110. Accordingly, the second target battery may also be two or more charged batteries in the battery pack 110.
It should be noted that, since the charging input unit 30 converts the commercial power 120 to obtain the first charging current or the second charging current, and the commercial power 120 is an alternating current, no matter the charging input unit 30 outputs the first charging current or the second charging current according to the commercial power, the alternating current of the commercial power 120 needs to be converted first. That is, the alternating current of the utility power 120 is converted into the direct current, and then the first charging current capable of uniformly charging the battery pack 110 is obtained by transforming and limiting the direct current, and when the uniform charging is stopped, the second charging current is outputted to the first battery in the battery pack 110 for the complementary charging.
In implementation, the charging input unit 30 may be obtained by combining an ac/dc conversion circuit and a transformation circuit, and after the ac/dc conversion circuit converts the commercial power to obtain a corresponding direct current, the transformation current steps down or steps up the direct current to obtain a first charging current capable of uniformly charging the battery pack 110 and/or obtain a second charging current capable of performing supplementary charging on the first target battery.
In this embodiment, when the control unit 20 outputs the unified charging control signal, the charging input unit 30 receives the unified charging control signal, and then outputs the first charging current according to the utility power 120 to uniformly charge the battery pack 110, and since the unified charging operation is performed on the entire battery pack 110, the supplementing unit 40 is not required to participate in the unified charging operation. In the process of uniformly charging the battery pack 110, the acquisition unit 10 acquires charging data of each battery in the battery pack 110, and when the control unit 20 determines a second target battery whose charging is completed from the battery pack 110 based on the charging data, outputs a supplementary charging control signal and a path control signal. Here, the control unit 20 outputs the supplementary charging control signal to the charging input unit 30, and causes the charging input unit 30 to output the second charging current according to the commercial power. The control unit 20 outputs the path control signal to the complementary unit 40, and the complementary unit 40 switches on a loop between the charging input unit 30 and the first target battery according to the path control signal to form a complementary charging loop, so that the second charging current output by the charging input unit 30 according to the commercial power can be transmitted to the first target battery in the battery pack 110 through the complementary charging loop, and further, the complementary charging is performed on the first target battery.
When implemented, the supplementary unit 40 may include a plurality of pairs of conductive branches, and the plurality of pairs of conductive branches are connected to the plurality of batteries in the battery pack 110 in a one-to-one correspondence. Here, one branch of each pair of conducting branches may be connected to the charging input unit 30 through a uniform node, and meanwhile, the other branch is connected to a single battery in the battery pack, so that the multiple pairs of conducting branches are correspondingly connected to the positive and negative electrodes of the multiple batteries, so that when the supplementary unit 40 receives the path control signal, the conducting branch corresponding to the first target battery is selected to be conducted according to the path control signal, that is, the loop between the charging input unit 30 and the first target battery is conducted according to the path control signal, so as to form a supplementary charging loop, and further, supplementary charging is performed on the first target battery through the supplementary charging loop by using the second charging current.
It is easy to understand that, the conducting branches in each pair of conducting branches in the supplementing unit 40 are in a mutually matched relationship, that is, two conducting branches in each pair of conducting branches are in a same-connection and same-disconnection relationship, and when the supplementing unit 40 receives the path control signal, the supplementing unit turns on two conducting branches in the target conducting branches according to the path control signal, that is, turns on the loop between the charging input unit 30 and the first target battery, so as to form a supplementing charging loop.
As an example, the supplementing unit 40 may further include a path control unit for controlling on/off of each pair of conducting branches, and the path control unit determines a target conducting branch corresponding to the first target battery from the plurality of pairs of conducting branches according to the path control signal, and controls the target conducting branch to be turned on, so as to implement a loop between the charging input unit 30 and the first target battery, and form a supplementing charging loop.
It will be appreciated that in particular implementations, the conductive branches in the supplementary unit 40 may be conductive branches obtained by using existing electrically controlled component assemblies. The electric control component can be an electric control switch, a relay or an electric control switch composed of switch tubes and the like.
In all embodiments of the present application, the charging and discharging control circuit 100 of the battery pack controls the battery pack 110 to stop discharging at the same time while realizing uniform charging of the battery pack 110. It can be seen that the timing of controlling the battery pack 110 to stop discharging is when the first target battery whose discharge is cut off is determined from the battery pack 110 based on the discharge data. In addition, the unified charging of the battery pack 110 and the complementary charging of the first target battery belong to two different charging modes, and the complementary charging of the first target battery is performed after the unified charging of the battery pack 110, and since the first target battery is a single battery whose discharge is determined to be the first cut-off during the discharging of the battery pack 110, in order to ensure that the single battery whose discharge is the first completed during the discharging can be fully charged, when the unified charging of the battery pack 110 is performed and a second target battery whose charging is completed is determined from the battery pack 110 based on the charging data, the complementary charging control signal and the path control signal are output, and through the cooperation of the charging input unit 30 and the complementary unit 40, the single battery whose discharge is the first completed during the discharging, that is, the single complementary charging operation of the first target battery is performed.
As an embodiment, the collecting unit 10 is further configured to collect the supplementary charging data of the first target battery during the supplementary charging process, and send the supplementary charging data to the control unit 20. Accordingly, the control unit 20 is also configured to output an open circuit control signal to the replenishing unit 40 when the first target charging data is detected from the replenishing charging data. The replenishing unit 40 is further configured to disconnect the loop between the charging input unit 30 and the first target battery and stop replenishing the first target battery when receiving the disconnection control signal.
In the present embodiment, the first target charging data is used to describe data of the first target battery at the time of completion of charging. Here, when the plurality of batteries in the battery pack 110 are the same-sized batteries, the first target charging data may also be used to represent data of each battery in the battery pack 110 at the time of completion of charging.
As an example, the battery pack 110 is in a discharging state or a charging state, and the discharging data and the charging data detected by the collecting unit 10 are data of each battery in the battery pack 110 during discharging, such as a battery discharging voltage and/or a battery discharging current.
In the separate recharging process for the first target battery, the acquisition unit 10 is used to acquire the recharging data of the first target battery during the recharging process, and send the recharging data to the control unit 20. Since the control unit 20 is further configured to output the open circuit control signal when the first target charging data is detected from the supplementary charging data, that is, the control unit 20 determines that the charging of the first target battery is completed when the first target charging data is detected from the supplementary charging data, and further, by outputting the short circuit control signal to the supplementary unit 40, the supplementary unit 40 disconnects the circuit between the charging input unit 30 and the first target battery when receiving the open circuit control signal, and stops the supplementary charging of the first target battery. The first target battery in the battery pack 110 is recharged after the battery pack 110 is uniformly charged, so that each single battery in the battery pack 110 can be recharged as the first target battery in subsequent charging and discharging processes in the continuous charging and discharging process of the battery pack 110, further the charging and discharging balance of the battery pack 110 is realized, and the service life of the battery pack is prolonged.
As an embodiment, the control unit 20 is specifically configured to output the uniform charging control signal when the target discharging data is determined from the discharging data, and output the supplementary charging control signal and the path control signal when the first target charging data is determined from the charging data; the target discharge data is used for determining a first target battery with cut-off discharge from the battery pack; the first target charging data is used to determine a second target battery whose charging is completed from the battery pack.
In the present embodiment, the target discharge data is used to indicate the discharge cutoff of the battery in the battery pack 110, that is, when the discharge data of a certain battery in the battery pack 110 is the target discharge data, it can be determined that the certain battery is the first target battery with discharge cutoff. The first target charging data is used to indicate that the charging of the batteries in the battery pack 110 is completed, that is, when the charging data of a certain battery in the battery pack 110 is the first target charging data, the battery is determined to be a second target battery that is completely charged.
As a possible implementation manner of this embodiment, the collecting unit 10 is specifically configured to collect a discharging voltage of each battery during discharging and a storage voltage of each battery during charging.
In the present embodiment, since the first target battery is the battery cell having the highest discharge speed in the battery pack 110 and is also the battery cell that has been completely discharged, the supplementary charging operation is performed for the first target battery after the battery pack 110 is uniformly charged. Since the second target battery is the single battery that is charged first in the unified charging process of the battery pack 110, if the second target battery and the first target battery are the same battery at this time, the complementary charging operation is not performed on the first target battery.
In the scheme, the acquisition unit is used for acquiring discharge data and charge data of each battery in the battery pack, the control unit determines a first target battery with cut-off discharge from the battery pack based on the discharge data in the discharging process of the battery pack, outputs a unified charge control signal, when the unified charge control signal is transmitted to the charge input unit, the charge input unit can output a first charge current according to commercial power to uniformly charge the battery pack, in the charging process of the battery pack, the control unit determines a second target battery with finished charge from the battery pack based on the charge data, outputs a supplementary charge control signal and a channel control signal, when receiving the supplementary charge control signal, the charge input unit outputs a second charge current according to the commercial power, when receiving the channel control signal, the supplementary unit switches on a loop between the charge input unit and the first target battery according to the channel control signal, and forming a supplementary charging loop, and further performing supplementary charging on the first target battery by using the second charging current through the supplementary charging loop. In the discharging process of the battery pack, once the first target battery with cut-off discharging is determined from the battery pack based on the discharging data, the discharging operation of the battery pack is immediately stopped and the battery pack is uniformly charged, so that the phenomenon of over-discharging of the battery pack is avoided; meanwhile, in the process of uniformly charging the battery pack, once a second target battery which is charged is determined from the battery pack based on charging data, the uniform charging operation of the battery pack is immediately stopped, a circuit between the charging input unit and the first target battery is conducted by using the supplementing unit to form a supplementing charging circuit, and then the supplementing charging circuit is used for supplementing charging the first target battery by using a second charging current, so that the over-discharge protection and the over-charge protection of the battery pack are realized, and simultaneously, the batteries in the battery pack tend to be balanced after being charged and discharged for many times in a supplementing charging mode, and the service life of the battery pack can be prolonged.
Referring to fig. 2, fig. 2 is a schematic diagram of a specific structure of a charge and discharge control circuit of a battery pack according to an embodiment of the present disclosure. As shown in fig. 2, as a possible implementation manner of the present embodiment, the control unit 20 includes a data input terminal 21, a first output terminal 22, and a second output terminal 23.
The data input end 21 is used for connecting the acquisition unit 11, the first output end 22 is used for connecting the charging input unit 30, and the second output end 23 is used for connecting the supplement unit 40.
As shown in fig. 2, based on the above-described embodiment, as an embodiment, the charging input unit 30 includes: a rectifying unit 31 and a dc voltage converting unit 32. Specifically, the method comprises the following steps:
the rectifying unit 31 is connected to the commercial power 120, and the rectifying unit 31 is configured to output an initial direct current according to the commercial power.
The dc voltage converting unit 32 is connected to the rectifying unit 31 and the control unit 20, respectively, and the dc voltage converting unit 32 is configured to perform voltage conversion on the initial dc power to output a first charging current when receiving the unified charging control signal, and perform voltage conversion on the initial dc power to output a second charging current when receiving the supplementary charging control signal.
Since the commercial power 120 is ac power and cannot be used directly as charging power for the battery pack 110, the rectifier unit 31 converts the ac power provided by the commercial power and outputs the initial dc power. The initial dc power is then transferred to the dc voltage conversion unit 32. When receiving the unified charging control signal, the dc voltage conversion unit 32 performs voltage conversion on the initial dc power to output a first charging current, and when receiving the supplementary charging control signal, performs voltage conversion on the initial dc power to output a second charging current.
In the present embodiment, since the data input terminal 21 of the control unit 20 is connected to the collecting unit 11, the collecting unit 11 can transmit the collected discharging data (e.g., discharging voltage) and charging data (e.g., storage voltage) of each battery in the battery pack 110 to the control unit 20 by being connected to the input terminal 21.
Here, taking the discharge data as the discharge voltage and the charge data as the storage voltage as an example, since the first output terminal 22 of the control unit 20 is connected to the charge input unit 30, when the control unit 20 recognizes the target discharge voltage from the discharge voltage of each battery, the unified charge control signal is output to the charge input unit 30 through the first output terminal 22. In the charging input unit 30, the rectifying unit 31 outputs an initial direct current according to the commercial power, and the single direct current voltage converting unit 32 performs voltage conversion on the initial direct current when receiving the uniform charging control signal, and outputs a first charging current to uniformly charge the battery pack 110.
In practical applications, the control unit 20 may determine whether the first target battery and the second target battery are the same battery by recording the information of the first target battery and the information of the second target battery during a discharging and charging cycle. When the information of the first target battery is different from the information of the second target battery, the second target battery and the first target battery in the round of charging and discharging can be determined to be two different single batteries, and then a supplementary charging control signal and a channel control signal are output. The path control signal is transmitted to the supplementary unit 40 via the second output 23.
In the charging input unit 30, the rectifying unit 31 outputs an initial direct current according to the commercial power, and the single direct current voltage converting unit 32 performs voltage conversion on the initial direct current and outputs a second charging current when receiving the supplementary charging control signal. When receiving the path control signal, the complementary unit 40 turns on a loop between the charging input unit 30 and the first target battery according to the path control signal to form a complementary charging loop, and further performs complementary charging on the first target battery by using the second charging current through the complementary charging loop.
As shown in fig. 2, based on the above-described embodiment, as an embodiment, the dc voltage converting unit 32 includes: a first switching path 321, a second switching path 322, and a dc voltage converter 323.
The first switch path 321 is used to connect the dc voltage converter and the battery pack.
A second switching path 322 for connecting the dc voltage converter and the complementary unit.
The dc voltage converter 323 is connected to the control unit 20, and the dc voltage converter 323 is configured to convert the initial dc voltage to output a first charging current to the battery pack 110 through the first switching path 321 when receiving the unified charging control signal, convert the initial dc voltage to output a second charging current to the charging unit 40 through the second switching path 322 when receiving the supplementary charging control signal.
In the present embodiment, the dc voltage converter 323 does not receive the unified charging control signal and the complementary charging control signal at the same time because the unified charging control signal is output by the control unit 20 when the first target battery is determined from the battery pack based on the discharging data, and the complementary charging control signal is output by the control unit 20 when the second target battery whose charging is completed is determined from the battery pack based on the charging data, and because the charging and discharging of the battery pack are not performed at the same time, the dc voltage converter 323 does not receive the unified charging control signal and the complementary charging control signal at the same time.
In a specific implementation, the first switch path 321 and the second switch path 322 may use the same switch circuit, and when the dc voltage converter 323 receives the unified charging control signal or the complementary charging control signal, the dc voltage converter performs voltage conversion on the initial dc, and turns on the switch circuit of the first switch path 321 or the second switch path 322, so as to output the first charging current or output the second charging current through the first switch path 321 or the second switch path 322.
As shown in fig. 2, based on the above-mentioned embodiment, as an embodiment, the control unit 20 is further configured to output an open circuit control signal to the supplementing unit 40 when the first target charging data is detected from the supplementing charging data.
The supplementary unit 40 includes: a switching circuit 41 and an on-off control unit 42. Specifically, the method comprises the following steps:
the switching circuit 41 is connected between the second switching path 322 and the battery pack 110. The on-off control unit 42 is connected to the control unit 20 and the switch circuit 41, respectively. The on-off control unit 42 is configured to, when receiving the on-off control signal, control the switch circuit 41 to turn on the circuit between the second switch path 322 and the first target battery according to the on-off control signal to form a complementary charging circuit, and, when receiving the off-off control signal, control the switch circuit 41 to turn off the circuit between the second switch path 322 and the first target battery according to the off-off control signal.
In the present embodiment, the control unit 20 sends the path control signal to the supplement unit 40, and since the control unit 20 can determine the battery that is first discharged and cut off in the battery pack 110 after determining the first target battery, when the battery that is first charged and completely charged is present in the battery pack 110, a process of supplementing charging is provided for the first target battery in order to promote charge and discharge equalization of each battery in the battery pack 110. That is, the control unit 20 transmits the path control signal to the replenishing unit 40 after determining the second target battery from the battery pack 110. The on-off control unit 42 in the recharging unit 40 controls the switch circuit 41 to open the circuit between the second switch path 322 and the first target battery according to the path control signal, thereby forming a recharging circuit. Because the control unit 20 outputs the channel control signal and also outputs the complementary charging control signal to the charging input unit 30, the charging input unit 30 outputs the second charging current according to the commercial power, and then performs the complementary charging with the second charging current as the first target battery through the complementary charging circuit.
As an example, after the control unit 20 determines the first target battery, the position of the first target battery in the battery pack 110 may be determined, and by carrying the number or address of the first target battery in the path control signal, the on-off control unit 42 in the complementary unit 40 may turn on the conductive path or pin connected to the first target battery in the switch circuit 41 according to the number or address of the first target battery, and write a complementary charging loop between the charging input unit 40 and the first target battery through the switch circuit 41.
Fig. 3 is a schematic diagram of a specific structure of a charge and discharge control circuit of a battery pack according to an embodiment of the present application. As shown in fig. 3, based on the above-described embodiment, as an embodiment, the switching circuit 41 includes: n first switch units and N +1 second switch units.
The N first switch units are connected in series to form N +1 first nodes.
The N +1 second switch units are respectively connected between the N +1 first nodes and the N +1 second nodes; wherein, the N +1 second nodes are obtained by connecting N batteries in series.
As shown in fig. 3, in the present embodiment, the first switch units 411 in the switch circuit 41 correspond one-to-one to the unit cells in the battery pack 110. And the first switching unit 411 in the switching circuit 41 is connected to the second switching path 322 and the first battery in the battery pack 110 is connected to the first switching path 321.
In the case of uniformly charging the battery pack 110, the charging input unit 30 delivers a first charging current to the battery pack 110 through the second switching path 322. When the first target resistor is subjected to the complementary charging, the first switch unit 411 corresponding to the first target battery is turned off, the other first switch units 411 are turned on at the same time, and the two second switch units connected to the first target battery are turned on, so that a complementary charging loop is formed with the second switch paths. The charging input unit 30 performs the supplementary charging with the second charging current as the first target battery by turning on the second switching path 322.
Fig. 4 is a circuit diagram illustrating a connection between a switch circuit and a battery pack in a charging/discharging control circuit of the battery pack according to an embodiment of the present disclosure. As shown in fig. 4, as an example, the N first switch units in the switch circuit 41 may be regarded as N first-type electrically controlled switches (S11, S12 … … S1N) connected in series while forming N +1 first nodes P1. In the battery pack 110, N batteries (T1, T2 … … TN) are connected in series to obtain N +1 second nodes P2. The N +1 second switch units in the switch circuit 41 can be regarded as N +1 second-type electrically controlled switches (S21, S22 … … S2N, S2N + 1). As shown in fig. 4, the N +1 second-type electronically controlled switches (S21, S22 … … S2N, S2N +1), the N +1 first nodes P1, and the N +1 second nodes P2 are the same in number, and it can be seen that the second-type electronically controlled switches are determined based on the number of batteries connected in series in the battery pack 110. In this example, a single electrically controlled switch of the second type is connected between the single first node P1 and the single second node P2, respectively.
The operation principle of the charge/discharge control circuit 100 of the battery pack in this embodiment will be described in detail with reference to fig. 3 and 4.
As shown in fig. 3, the charge/discharge control circuit 100 of the battery pack is connected to the battery pack 110. The charge/discharge control circuit 100 of the battery pack includes: the system comprises an acquisition unit 10, a control unit 20, a charging input unit 30 and a supplementing unit 40.
In fig. 3, the acquisition unit 10 acquires data of each battery in the battery pack 110, the acquisition unit 10 is connected to the data input terminal 21 of the control unit 20, and during the discharging process of the battery pack 110, the acquisition unit 10 acquires discharging data of each battery in the battery pack and transmits the discharging data of each battery to the control unit 20 through the data input terminal 21. During the charging process of the battery pack 110, the collecting unit 10 collects the charging data of each battery in the battery pack and transmits the charging data of each battery to the control unit 20 through the data input terminal 21.
Taking as an example that the collecting unit 10 collects the discharge voltage of each battery in the battery pack when the battery pack 110 is discharged. If the control unit 20 determines the first target battery whose discharge is cut off from the battery pack 110 based on the discharge voltage of each battery in the battery pack, the unified charging control signal is output. Here, since the first target battery is a battery in which the discharge of the battery pack 110 is first stopped during the current discharge, the control unit 20 outputs the uniform charge control signal to switch to the operation of uniformly charging the battery pack 110 in order to stop the discharge state of the battery pack 110 after determining the first target battery.
As shown in fig. 4, assuming that the first target battery in the battery pack 110 is the battery T1 in the present example, the control unit 20 records the information of the first target battery as T1. As shown in fig. 3, the control unit 20 transmits the unified charging control signal to the charging input unit 30 through the first output terminal 22, and the rectifying unit 31 in the charging input unit 30 converts the alternating current provided by the utility power 120 into the initial direct current and transmits the initial direct current to the direct current voltage converting unit 32. Here, the dc voltage converting unit 32 includes: a first switching path 321, a second switching path 322, and a dc voltage converter 323. When receiving the uniform charging control signal, the dc voltage converter 323 performs voltage conversion on the initial dc power, and outputs a first charging current to the battery pack 110 through the first switch path 321, thereby performing uniform charging on the battery pack 110.
The example is that the acquisition unit 10 acquires the storage voltage of each battery in the battery pack when the battery pack 110 is charged uniformly. If the control unit 20 determines the second target battery whose charging is completed from the battery pack 110 based on the accumulated voltage of each battery in the battery pack, the supplementary charging control signal and the path control signal are output. Here, since the second target battery is a battery that has been charged in the battery pack 110, the control unit 20 outputs the complementary charging control signal to switch to the first target battery in the battery pack 110 for complementary charging in order to stop the uniform charging state of the battery pack 110 after the second target battery is determined.
As shown in fig. 3 and 4, based on the above example, it is assumed that the first target battery in the battery pack 110 is the battery T1, and the control unit 20 records the information of the first target battery as T1. If the control unit 20 determines that the second target battery is the battery T2 from the battery pack 110, it can be determined that the first target battery (the battery T1) that is discharged first in the discharging process of the previous time of the unified charging is different from the second target battery (the battery T2) that is charged first in the current unified charging, and thus the supplementary charging control signal is output to the charging input unit 30 through the first output terminal 22. In addition, if the control unit 20 determines that the second target battery is also the battery T1 from the battery pack 110, it can be determined that the first target battery that has been discharged first in the discharging process of the previous time of the unified charging is the same as the second target battery that has been charged first in the current unified charging, and therefore, it outputs warning information for warning an abnormality in the first target battery T1 or warning an abnormality in the second target battery T1.
As shown in fig. 3 and 4, in the case that the control unit 20 determines that the second target battery is T2 and the first target battery is T1 from the battery pack 110, the control unit 20 transmits the supplementary charging control signal to the charging input unit 30 through the first output terminal 22, and the rectifying unit 31 in the charging input unit 30 converts the alternating current provided by the utility power 120 into the initial direct current and transmits the initial direct current to the direct current voltage converting unit 32. Here, the dc voltage converter 323 in the dc voltage conversion unit 32, upon receiving the supplementary charging control signal, performs voltage conversion on the initial dc power to obtain a second charging current, and outputs the second charging current through the second switching path 322. Meanwhile, the control unit 20 also outputs an on-off control signal to the supplement unit 40 through the second output terminal 23.
As shown in fig. 3, when receiving the path control signal, the on-off control unit 42 in the complementary unit 40 controls the switch circuit 41 to turn on the circuit between the second switch path 322 and the first target battery according to the path control signal, so as to form a complementary charging circuit, and further perform complementary charging on the first target battery by using the second charging current through the complementary charging circuit.
Referring to fig. 3 and 4, the first switch path 321 and the second switch path 322 may be electrically controlled switches, and the switching between the unified charging process and the complementary charging process is realized by controlling the on/off of the first switch path 321 and the second switch path 322. In fig. 4, N first switch units in the switch circuit 41 are connected in series to form N +1 first nodes, and N +1 second switch units are respectively connected between the N +1 first nodes and the N +1 second nodes, where the N +1 second nodes are obtained by connecting N batteries in series.
In connection with the above example, as shown in fig. 3, in the case where the control unit 20 determines that the second target battery is T2 and the first target battery is T1 from the battery pack 110, the control unit 20 sends a path control signal to the supplement unit 40. When receiving the path control signal, the on-off control unit 42 in the supplementary unit 40 controls the switch circuit 41 to turn on the circuit between the second switch path 322 and the first target battery according to the path control signal, so as to obtain a supplementary charging circuit. As shown in fig. 4, the circuit between the second switch path 322 and the first target battery is turned on by turning off the first switch unit S11 corresponding to the first target battery T1, turning on the first switch units (S12, S13 … … S1N) other than the first switch unit S11, and simultaneously turning on the second switch units (S21, S22) connected to both ends of the first target battery T1, so as to connect the first target battery to the recharging circuit. In the supplementary charging circuit, the second charging current charges the first target battery T1 through the second switching path 322 and the second switching unit S21, and then flows to the battery negative circuit path composed of the other first switching units (S12, S13 … … S1N) except the first switching unit S11 through the second switching unit S22.
When the first target battery T1 is charged with the second charging current through the supplementary charging circuit, the collecting unit 10 transmits charging data of the first target battery T1 to the control unit 20. The control unit 20 outputs a disconnection control signal to the supplementing unit 40 when the first target charging data is detected from the supplementing charging data. When receiving the open circuit control signal, the on-off control unit 42 in the replenishing unit 40 controls the switch circuit 41 to open the circuit between the second switch path 322 and the first target battery, that is, to open the replenishing charging circuit, according to the open circuit control signal.
In practical use, during the multiple discharging, charging and complementary charging cycles of the battery pack, the determined first target battery and the second target battery can be different single batteries in the battery pack, so that the scheme provided by the embodiment can realize the over-discharging protection and the over-charging protection of the battery pack, and simultaneously enables the batteries in the battery pack to tend to be balanced after multiple charging and discharging in a complementary charging mode, namely dynamically realizes the charging and discharging balance of the battery pack in the charging and discharging cycles, and can prolong the service life of the battery pack.
Fig. 5 shows a schematic structural diagram of a power supply provided in an embodiment of the present application. As shown in fig. 5, a power supply 200 includes a battery pack 110 and a charging/discharging control circuit 100 of the battery pack in the above embodiment.
Fig. 6 shows a schematic structural diagram of an electric device according to an embodiment of the present application. As shown in fig. 6, an electric device 300 includes the power supply 200 in the above embodiment.
It can be understood that, since the power supply 200 and the electric device 300 provided in the present embodiment, the content and implementation related to the present application have been described in detail in the foregoing, so that no further description is provided herein.
The units in the terminal of the embodiment of the application can be combined, divided and deleted according to actual needs.
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, and these modifications or substitutions are intended to be included in the scope of the invention. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A charge and discharge control circuit of a battery pack is connected with the battery pack, and is characterized in that the charge and discharge control circuit comprises:
the acquisition unit is connected with each battery in the battery pack and is used for acquiring the discharge data and the charge data of each battery in the battery pack;
the control unit is connected with the acquisition unit and used for outputting a uniform charging control signal when a first target battery with cut-off discharging is determined from the battery pack based on the discharging data and outputting a supplementary charging control signal and a path control signal when a second target battery with finished charging is determined from the battery pack based on the charging data;
the charging input unit is connected with the battery pack and the control unit respectively, and is used for outputting a first charging current to uniformly charge the battery pack according to the commercial power when receiving the uniform charging control signal and outputting a second charging current according to the commercial power when receiving the supplementary charging control signal;
the supplementary unit is connected with the battery pack, the charging input unit and the control unit respectively, and is used for conducting a loop between the charging input unit and the first target battery according to the path control signal to form a supplementary charging loop when receiving the path control signal; the supplementary charging loop is used for supplementary charging the first target battery by using the second charging current.
2. The battery pack charging and discharging control circuit according to claim 1, wherein the acquisition unit is further configured to acquire supplementary charging data of the first target battery during a supplementary charging process, and send the supplementary charging data to the control unit;
the control unit is further configured to output an open circuit control signal to the replenishing unit when the first target charging data is detected from the replenishing charging data;
the supplement unit is further configured to disconnect a loop between the charging input unit and the first target battery and stop performing the supplementary charging for the first target battery when the disconnection control signal is received.
3. The charge and discharge control circuit of the battery pack according to claim 2, wherein the battery pack comprises N cells, and the N cells are connected in series, where N is an integer greater than 1;
the collecting unit comprises N pairs of collecting ends, each pair of collecting ends is connected with the positive electrode and the negative electrode of each battery, and the collecting unit is specifically used for collecting the discharge voltage of each battery in the discharge process and the storage voltage of each battery in the charging process.
4. The charge and discharge control circuit of the battery pack according to claim 3, wherein the control unit includes a data input terminal, a first output terminal, and a second output terminal;
the data input end is used for being connected with the acquisition unit, the first output end is used for being connected with the charging input unit, and the second output end is used for being connected with the supplement unit.
5. The charge and discharge control circuit of the battery pack according to any one of claims 2 to 4, wherein the charge input unit includes: the rectifier unit and the direct-current voltage conversion unit;
the rectifying unit is connected with the commercial power and used for outputting initial direct current according to the commercial power;
the direct current voltage conversion unit is respectively connected with the rectification unit and the control unit, and is used for performing voltage conversion on the initial direct current to output a first charging current when receiving the unified charging control signal, and performing voltage conversion on the initial direct current to output a second charging current when receiving the supplementary charging control signal.
6. The charge and discharge control circuit of a battery pack according to claim 5, wherein the DC voltage conversion unit includes: a first switching path, a second switching path and a DC voltage converter;
the first switch path is used for connecting the direct-current voltage converter and the battery pack;
the second switch path is used for connecting the direct-current voltage converter and the supplementary unit;
the direct current voltage converter is connected with the control unit and used for converting the voltage of the initial direct current when receiving the unified charging control signal, outputting a first charging current to the battery pack through the first switching circuit, converting the voltage of the initial direct current when receiving the supplementary charging control signal, and outputting a second charging current to the supplementary unit through the second switching circuit.
7. The charge and discharge control circuit of a battery pack according to claim 6, wherein the supplementary unit includes:
a switching circuit connected between the second switching path and the battery pack;
and the on-off control unit is used for controlling the switch circuit to conduct a loop between the second switch path and the first target battery according to the access control signal to form a supplementary charging loop when receiving the access control signal, and controlling the switch circuit to disconnect the loop between the second switch path and the first target battery according to the open-circuit control signal when receiving the open-circuit control signal.
8. The charge and discharge control circuit of a battery pack according to claim 7, wherein the switching circuit includes: n first switch units and N +1 second switch units;
the N first switch units are connected in series to form N +1 first nodes;
the N +1 second switch units are respectively connected between the N +1 first nodes and the N +1 second nodes; wherein, the N +1 second nodes are obtained by connecting the N batteries in series.
9. A power supply comprising a battery pack, characterized in that it further comprises a charge and discharge control circuit of the battery pack according to any one of claims 1 to 8.
10. An electrical consumer, characterized in that the electrical consumer comprises the power supply of claim 9.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113541271A (en) * | 2021-08-20 | 2021-10-22 | 深圳市爱派思新能源科技有限公司 | Charge-discharge control circuit, power supply and electric equipment of battery pack |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113541271A (en) * | 2021-08-20 | 2021-10-22 | 深圳市爱派思新能源科技有限公司 | Charge-discharge control circuit, power supply and electric equipment of battery pack |
| CN113541271B (en) * | 2021-08-20 | 2024-05-17 | 深圳市爱派思新能源科技有限公司 | Charging and discharging control circuit, power supply and electric equipment of battery pack |
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