CN110015182B - Battery equalization system, vehicle, battery equalization method, and storage medium - Google Patents

Battery equalization system, vehicle, battery equalization method, and storage medium Download PDF

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Publication number
CN110015182B
CN110015182B CN201710773454.6A CN201710773454A CN110015182B CN 110015182 B CN110015182 B CN 110015182B CN 201710773454 A CN201710773454 A CN 201710773454A CN 110015182 B CN110015182 B CN 110015182B
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China
Prior art keywords
battery
balancing
module
needing
battery pack
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CN201710773454.6A
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CN110015182A (en
Inventor
罗红斌
王超
沈晓峰
曾求勇
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BYD Co Ltd
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BYD Co Ltd
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Priority to CN201710773454.6A priority Critical patent/CN110015182B/en
Priority to PCT/CN2018/103271 priority patent/WO2019042362A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
    • B60L58/22—Balancing the charge of battery modules
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0014—Circuits for equalisation of charge between batteries
    • H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Abstract

The disclosure discloses a battery equalization system, a vehicle, a battery equalization method and a storage medium. The battery equalization system includes: the acquisition module is used for acquiring parameter information of the single batteries in the battery pack; the balancing module is used for carrying out balancing processing on the single batteries needing to be balanced through a storage battery, and the storage battery is connected with the single batteries in the battery pack; and the control module is used for controlling the balancing module to discharge to the storage battery through the single battery needing to be started for balancing when the single battery in the battery pack is determined to need to be started for balancing according to the parameter information of the battery pack. According to the battery balancing system, the balancing module is controlled to discharge the single batteries needing to be balanced to the storage battery, and the technical problem that the battery balancing system adopting a passive balancing mode wastes electric energy during balancing in the related technology is solved.

Description

Battery equalization system, vehicle, battery equalization method, and storage medium
Technical Field
The present disclosure relates to the field of battery pack balancing, and in particular, to a battery balancing system, a vehicle, a battery balancing method, and a storage medium.
Background
In an electric vehicle, a power battery pack is an important component thereof. Because the battery pack is formed by connecting a plurality of single batteries in series, along with the use of the batteries, the difference between the single batteries in the battery pack is gradually enlarged, and the consistency between the single batteries is poor. Due to the short plate effect of the battery, the capacity of the battery pack cannot be fully utilized, and the overall capacity of the battery pack is reduced. Therefore, the method has the advantages of effectively and uniformly managing the power battery pack of the electric automobile, being beneficial to improving the consistency of each single battery in the power battery pack, reducing the capacity loss of the battery, prolonging the service life of the battery and the driving range of the electric automobile, and having very important significance.
In practical application of related equalization technology, a battery equalization system usually adopts a passive equalization mode, that is, two ends of each single battery are connected with a resistor in parallel, and when equalization is needed, the electric quantity of the battery with more electric quantity is discharged to a part through the resistor, so as to achieve the effect of being consistent with the battery with less electric quantity.
In the balancing system of the related art, due to the adoption of a passive balancing mode, when the battery balancing system is balanced, the electric quantity emitted by the battery with more electric quantity can be converted into heat of the resistor, and further the waste of electric energy is caused.
Disclosure of Invention
The purpose of the present disclosure is to provide a battery equalization system, a vehicle, a battery equalization method, and a storage medium, which are used to solve the technical problem in the related art that a battery equalization system using a passive equalization method wastes electric energy during equalization.
In order to achieve the above object, the present disclosure provides a battery equalization system including:
the acquisition module is used for acquiring parameter information of the single batteries in the battery pack;
the balancing module is used for carrying out balancing processing on the single batteries needing to be balanced through a storage battery, and the storage battery is connected with the single batteries in the battery pack;
and the control module is used for controlling the balancing module to discharge to the storage battery through the single battery needing to be started for balancing when the single battery in the battery pack is determined to need to be started for balancing according to the parameter information of the battery pack.
Optionally, the balancing module includes a balancing circuit, the balancing circuit includes discharge branches connected in parallel with each of the single batteries in the battery pack, the discharge branches correspond to the single batteries one to one, and each of the discharge branches is connected to the storage battery; each discharging branch is provided with a direct-current voltage converter, the low-voltage input end of the direct-current voltage converter is connected to the anode of the single battery, and the high-voltage output end of the direct-current voltage converter is connected to the anode of the storage battery.
Optionally, each of the discharging branches is further provided with a switch controlled by the control module; when the switch is switched on under the control of the control module, the discharging branch where the switch is located is switched on, so that the single batteries needing to be started and balanced are discharged to the storage battery.
Optionally, the parameter information includes voltage values of the respective single batteries;
the control module is used for determining the single batteries needing to be started and balanced in the following modes:
determining the minimum voltage value in the voltage values of all the single batteries in the battery pack as a reference voltage value;
and determining the single battery with the voltage difference value larger than or equal to a preset voltage difference threshold value as the single battery needing to be started for balancing according to the voltage difference value between the voltage value of each single battery in the battery pack and the reference voltage value.
Optionally, the control module is connected to the acquisition module and the balancing module corresponding to the same single battery through two channels.
Optionally, the control module includes a control chip, the control chip is connected to the acquisition module and the balancing module corresponding to the same single battery through two pins, the two pins correspond to the two channels one to one, one of the two pins is connected to the balancing module through one of the two channels, and the other of the two pins is connected to the acquisition module through the other of the two channels.
Optionally, the control module is connected to the acquisition module and the balancing module corresponding to the same single battery through a channel, and the acquisition module and the balancing module multiplex the channel in time division.
Optionally, the control module includes a control chip, the control chip is connected to the acquisition module and the equalization module corresponding to the same battery cell through a pin, and the pin is connected to the equalization module and the acquisition module through the channel.
Optionally, the control module is further configured to, when it is determined that a single battery in the battery pack needs to start balancing according to the parameter information of the battery pack, obtain a target balancing duration of the single battery needing to start balancing, and control the balancing module to discharge the single battery needing to start balancing to the storage battery according to the target balancing duration of the single battery needing to start balancing.
Optionally, the control module controls the balancing module to conduct a discharging branch corresponding to the single battery needing balancing to be started according to the target balancing duration and the balancing duty ratio, so that the single battery needing balancing to be started is discharged to the storage battery, the balancing duty ratio is a ratio of a balancing time period of the single battery needing balancing to be started to a unit cycle, and the unit cycle includes the balancing time period and a collecting time period.
The present disclosure also provides a vehicle including the above battery equalization system.
The present disclosure also provides a battery equalization method applied to a vehicle including a storage battery, the method including:
acquiring parameter information of a single battery in a battery pack;
determining that a single battery in the battery pack needs to be started for balancing according to the parameter information of the single battery in the battery pack;
and controlling the single batteries needing to be started for balancing to discharge to the storage battery.
Optionally, before controlling the single battery needing to start balancing to discharge to the storage battery, the method further includes:
and converting the voltage output by the single battery needing to be started and balanced into the voltage adaptive to the storage battery through a direct-current voltage converter.
Optionally, the parameter information includes voltage values of the respective single batteries;
the determining that there is a single battery in the battery pack that needs to be started for balancing includes:
determining the minimum voltage value in the voltage values of all the single batteries in the battery pack as a reference voltage value;
and determining the single battery with the voltage difference value larger than or equal to a preset voltage difference threshold value as the single battery needing to be started for balancing according to the voltage difference value between the voltage value of each single battery in the battery pack and the reference voltage value.
Optionally, the vehicle comprises a battery equalization system, the battery equalization system comprising: the system comprises a balancing module, an acquisition module and a control module, wherein the control module is connected with the acquisition module and the balancing module corresponding to the same single battery through a channel, and the acquisition module and the balancing module multiplex the channel in a time-sharing manner;
the parameter information of the single battery in the battery pack is acquired, and the parameter information comprises the following steps:
acquiring parameter information of a single battery in the battery pack through the acquisition module;
the determining that there is a single battery in the battery pack that needs to be started for balancing includes:
according to parameter information of single batteries in the battery pack, when determining that the single batteries in the battery pack need to be balanced, the control module acquires target balancing time length and balancing duty ratio of the single batteries needing to be balanced, wherein the balancing duty ratio is the ratio of the balancing time period of the single batteries needing to be balanced to a unit cycle, and the unit cycle comprises the balancing time period and an acquisition time period;
the control of the discharge of the single battery needing to be started for balancing to the storage battery comprises the following steps:
and the control module controls the single battery needing to be started for balancing to discharge to the storage battery according to the target balancing duration and the balancing duty ratio of the single battery needing to be started for balancing.
The present disclosure also provides a computer readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement the battery equalization method described above.
The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:
the battery pack balancing method and the battery pack balancing system have the advantages that when the fact that the single batteries need to be started and balanced in the battery pack is determined, the single batteries needing to be started and balanced are discharged to the storage battery through the balancing control module, accordingly, consistency difference among the single batteries in the battery pack is reduced, compared with a balancing scheme of discharging in a passive balancing mode in the related technology, energy is saved, and the technical problem that electric energy is wasted when a battery balancing system adopting the passive balancing mode in the related technology is balanced is solved.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
fig. 1 is a block diagram illustrating a battery equalization system according to an exemplary embodiment.
Fig. 2 is a schematic diagram of an equalization circuit of a battery equalization system according to an exemplary embodiment.
Fig. 3 is another block diagram illustrating a battery equalization system in accordance with an exemplary embodiment.
Fig. 4 is a flow chart illustrating a method of battery equalization in accordance with an exemplary embodiment.
Fig. 5 is a flowchart illustrating a method for balancing a battery according to an exemplary embodiment, including steps for determining that a single battery needs to start balancing.
Fig. 6 is another flow chart illustrating a method of battery equalization in accordance with an exemplary embodiment.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
Fig. 1 is a block diagram illustrating a battery equalization system according to an exemplary embodiment, and fig. 2 is a schematic diagram illustrating an equalization circuit of a battery equalization system according to an exemplary embodiment. As shown in fig. 1 and 2, the battery balancing system is applied to an automobile including a storage battery 33, and includes an acquisition module 12, a balancing module 13, and a control module 14, wherein a battery pack 11 is formed by connecting a plurality of single batteries 111 in series.
In fig. 1, the control module 14 is connected to the acquisition module 12 and the equalization module 13 corresponding to the same cell 111 via two channels 120, 130, respectively. The control module 14 includes a control chip, the control chip is connected to the acquisition module 12 and the balancing module 13 corresponding to the same single battery 111 through two pins, the two pins are in one-to-one correspondence with the two channels 120 and 130, one of the two pins is connected to the balancing module 13 through the channel 130, and the other of the two pins is connected to the acquisition module 12 through the channel 120.
As shown in fig. 1, the acquisition module 12 is configured to acquire parameter information of the single batteries 111 in the battery pack 11, and send the acquired parameter information of the battery pack to the control module 14, where the single batteries 111 in the battery pack 11 correspond to the acquisition module 12 one to one. The parameter information comprises information such as battery voltage and temperature. The control module 14 controls the acquisition module 12 to acquire the parameter information of the battery pack 11 by connecting the channel 120.
As shown in fig. 1 and fig. 2, the balancing module 13 is configured to perform balancing processing on the single cells 111 in the battery pack 11, when there is a single cell 111 requiring balancing in the battery pack 11, a channel 130 between the balancing module 13 and the control module 14 is conducted, and the balancing module 13 may be configured to connect the single cell 111 requiring balancing to the storage battery 33, so as to charge the storage battery 33 through the single cell 111 requiring balancing.
Referring to fig. 1 and 2, the balancing module 13 includes a balancing circuit, the balancing circuit includes a discharging branch 133 connected in parallel with each of the single batteries 111 in the battery pack 11, the discharging branch 133 corresponds to the single batteries 111 one by one, and each discharging branch 133 is connected to the storage battery 33.
Since the voltage output by the battery 33 may be different from the voltage of the single battery 111, each of the discharging branches 133 is provided with a dc voltage converter 134, a low-voltage input end of the dc voltage converter 134 is connected to the positive electrode of the single battery 111, a high-voltage output end of the dc voltage converter 134 is connected to the positive electrode of the battery 33, and the voltage output by the single battery 111 is converted into a voltage suitable for the battery 33 by the dc voltage converter 134. When the battery pack 11 has a single battery 111 that needs to start balancing, the control module 14 controls the discharge branch 133 corresponding to the single battery 111 that needs to start balancing to be conducted.
As shown in fig. 1 and fig. 2, each of the discharging branches 133 is further provided with a switch 135 controlled by the control module 14; when the control module 14 controls the switch 135 to be closed, the discharging branch 133 where the switch 135 is located is turned on, and the battery 33 and the single battery 111 form a loop to charge the single battery 111. Optionally, the switch 135 is a relay switch, and the control module 14 controls the switch 135 to be turned on or off by outputting a control signal.
As shown in fig. 1 and fig. 2, the control module 14 is configured to, when it is determined that there is a single cell 111 in the battery pack 11 that balancing needs to be started according to the parameter information of the single cell 111 in the battery pack 11, conduct the corresponding channel 130, and control the balancing module 13 to conduct the discharging branch 133 corresponding to the single cell 111 that balancing needs to be started, so that the single cell 111 that balancing needs to be started is discharged to the storage battery 33.
The control module 14 may determine the single battery 111 requiring balancing to be turned on by:
firstly, according to the voltage values of the single batteries 111 in the battery pack 11 acquired by the acquisition module 12, taking the minimum voltage value of the voltage values of the single batteries 111 in the battery pack 11 as a reference voltage value;
then, according to a voltage difference between the voltage value of each single battery 111 in the battery pack 11 and the reference voltage value, the single battery 111 whose voltage difference is greater than or equal to a preset voltage difference threshold is determined as the single battery 111 requiring starting equalization.
Optionally, the control module 14 is configured to, when it is determined that a single cell 111 in the battery pack 11 needs to start equalization according to the parameter information of the single cell 111 in the battery pack 11, for example, according to the voltage value of the single cell 111 needing to start equalization and the reference voltage value, obtain a target equalization duration of the single cell 111 needing to start equalization, and control the equalization module 13 to conduct the discharging branch 133 corresponding to the single cell 111 needing to start equalization according to the target equalization duration of the single cell 111 needing to start equalization, so that the single cell 111 needing to start equalization discharges to the storage battery 33.
Further, the control module 14 controls the balancing module 13 to discharge the cell to be turned on for balancing to the storage battery 33 according to the target balancing duration and the balancing duty ratio, where the balancing duty ratio is a ratio of a balancing time period to a unit period of the cell 111 to be turned on for balancing. One unit period includes: the equalization time period and the acquisition time period. In the collection time period, the collection module 12 collects parameter information of the battery pack 11; in the balancing time period, the balancing module 13 performs balancing processing on the single batteries 111 needing balancing in the battery pack 11.
For example, the collecting module 12 may determine the minimum voltage value among the voltage values of the single batteries 111 of the battery pack 11 as the reference voltage value, and the preset voltage difference threshold may be 5mV (or other values). First, the control module 14 compares the minimum voltage value Vmin of the single batteries 111 to obtain a minimum voltage value Vmin of the single batteries 111, and determines whether a difference between the voltage value of each single battery 111 of the battery pack 11 and the minimum voltage value Vmin is less than 5 mV. If yes, the battery pack 11 has good balance consistency and does not need to be balanced; if the difference value is more than 5mV, the single battery 111 with the difference value of more than 5mV with Vmin is taken as the single battery 111 needing to start the equalization. Then, the control module 14 controls the balancing module 13 to conduct the discharging branch 133 corresponding to the single battery 111 requiring balancing to start, and starts to discharge the battery 33.
In the discharging process, the control module 14 may continuously read the voltage information of the single battery 111 that needs to be turned on for balancing, and determine whether the voltage difference between Vmin and the single battery is less than 5 mV. If yes, disconnecting the discharging branch 133 corresponding to the single battery 111 needing to be started for balancing, and finishing balancing; and if the voltage difference is still greater than 5mV, continuously and circularly reading the voltage information of the single battery 111 needing to be started for balancing until the voltage difference between Vmin and the single battery is less than 5mV, controlling the discharge branch 133 corresponding to the single battery 111 needing to be started for balancing to be disconnected, and finishing the balancing.
After determining the single battery 111 needing to be balanced, the target balancing time length of the single battery 111 needing to be balanced is calculated according to the voltage value and Vmin of the single battery 111 needing to be balanced, then after discharging starts, the discharging time length of the single battery 111 needing to be balanced is counted, and when the difference value between the discharging time length of the single battery 111 and the target balancing time length is within the threshold range, the discharging branch 133 corresponding to the single battery 111 needing to be balanced is controlled to be disconnected, and balancing is finished.
This is disclosed is confirming when having the battery cell to open the equilibrium in the group battery, will through control equalizing module the branch circuit that discharges that the battery cell that needs to open the equilibrium corresponds switches on, so that the battery is discharged for to the battery cell that needs to open the equilibrium, thereby reduces the uniformity difference between each battery cell in the group battery, compares with the equilibrium scheme that adopts passive equilibrium mode to carry out the discharge among the correlation technique, has practiced thrift the energy, has solved the battery equalization system that adopts passive equilibrium mode among the correlation technique and has had the technical problem that wastes electric energy when the equilibrium.
Fig. 3 is another block diagram illustrating a battery equalization system in accordance with an exemplary embodiment. As shown in fig. 3 and fig. 2, the battery balancing system includes an acquisition module 12, a balancing module 13, and a control module 14, wherein the battery pack 11 is formed by connecting a plurality of single batteries 111 in series. The difference from the battery equalization system in fig. 1 is that in fig. 3, the control module 14 of the battery equalization system is connected to the acquisition module 12 and the equalization module 13 corresponding to the same cell 111 via a channel 140, and the acquisition module 12 and the equalization module 13 multiplex the channel 140 in time division.
When the control module 14 determines that the single battery 111 does not need to be balanced, the control module 14 is connected with the corresponding acquisition module 12 through the channel 140; or, when the control module 14 determines that the single battery 111 needs to be balanced, the acquisition module 12 and the balancing module 13 corresponding to the single battery 111 multiplex the channel 140 in a time-sharing manner, that is, the control module 14 is connected to the corresponding acquisition module 12 and the balancing module 13 in a time-sharing manner through the channel 140. The control module 14 includes a control chip, the control chip is connected to the acquisition module 12 and the equalization module 13 corresponding to the same battery cell 111 through a pin, and the pin is connected to the equalization module 13 and the acquisition module 12 through the channel 140.
Optionally, as shown in fig. 3 and fig. 2, the control module 14 controls the balancing module 13 to discharge to the storage battery 33 through the single battery needing to be started for balancing according to the target balancing duration and a balancing duty ratio, where the balancing duty ratio is a ratio of a balancing time period of the single battery 111 needing to be started for balancing to a unit cycle, and the unit cycle includes the balancing time period and a collecting time period. In fig. 3, the equalization duty cycle may also be a ratio of a time period in which the equalization module 13 occupies the channel 140 to a total time period in which the channel 140 is occupied; wherein the total duration of the channel 140 occupied includes the duration of the channel 140 occupied by the equalization module 13 and the duration of the channel 140 occupied by the acquisition module 12.
As shown in fig. 3 and fig. 2, firstly, the control module 14 communicates a channel 140 with the acquisition module 12, so as to control the acquisition module 12 to acquire parameter information of the battery pack 11; next, the control module 14 is configured to, when it is determined that a single battery 111 in the battery pack 11 needs to start balancing according to the parameter information of the single battery 111 in the battery pack 11, obtain a target balancing duration and a balancing duty ratio of the single battery 111 needing to start balancing, and communicate the channel 140 with the balancing module 13 corresponding to the single battery 111 needing to start balancing; then, the control module 14 controls the balancing module 13 to turn on the discharging branch 133 corresponding to the single battery 111 requiring balancing according to the target balancing duration and the balancing duty ratio of the single battery 111 requiring balancing, that is, the control module 14 may control the on-time of the switch 135 in fig. 2 according to the target balancing duration and the balancing duty ratio.
Optionally, the control module 14 determines an equalization time period and a collection time period according to the target equalization time period and the equalization duty ratio, and a sum of the equalization time period and the collection time period is equal to a total occupied time period of the channel 140; in the collection time period, the channel 140 is communicated with the collection module 12, so that the collection module 12 collects the parameter information of the battery pack 11; in the balancing time period, the channel 140 is communicated with the balancing module 13 that needs to be balanced, and the balancing module 13 is in a conducting state, so that the balancing module 13 performs balancing processing on the single batteries 111 that need to be balanced in the battery pack 11.
The control module, the voltage sampling circuit and the equalizing module of each single battery in the system multiplex a channel in a time-sharing manner, so that the requirement on the number of the channels of the control module is reduced, and the hardware cost is further reduced; and because the battery sampling and the equalization are carried out separately, the equalization current does not influence the battery voltage, thereby improving the accuracy of the battery voltage sampling.
The present disclosure also provides a vehicle including the above battery equalization system.
With regard to the vehicle in the above-described embodiment, the battery equalization system included in the vehicle is described in detail in the above-described embodiment of the battery equalization system, and will not be explained in detail here.
Fig. 4 is a flow chart illustrating a method of battery equalization in accordance with an exemplary embodiment. As shown in fig. 5, the battery equalization method is applied to a vehicle including a secondary battery, and includes the following steps.
And step S41, acquiring parameter information of the single batteries in the battery pack.
And step S42, determining that the single batteries in the battery pack need to be balanced according to the parameter information of the single batteries in the battery pack.
And step S43, controlling the single battery needing to be started to be balanced to discharge to the storage battery.
Optionally, before controlling the single battery needing to start balancing to discharge to the storage battery, the method further includes: and converting the voltage output by the single battery needing to be started and balanced into the voltage adaptive to the storage battery through a direct-current voltage converter.
Optionally, as shown in fig. 5, the parameter information includes voltage values of the individual batteries, and the determining that there is an individual battery in the battery pack that needs to start balancing includes the following steps.
In step S421, the minimum voltage value among the voltage values of the individual batteries in the battery pack is determined as a reference voltage value.
Step S422, according to a voltage difference between the voltage value of each single battery in the battery pack and the reference voltage value, determining the single battery with the voltage difference greater than or equal to a preset voltage difference threshold as the single battery requiring starting equalization.
Fig. 6 is another flow chart illustrating a method of battery equalization in accordance with an exemplary embodiment. As shown in fig. 6, the vehicle includes a battery equalization system including: the system comprises a balancing module, an acquisition module and a control module, wherein the control module is connected with the acquisition module and the balancing module corresponding to the same single battery through a channel, and the acquisition module and the balancing module multiplex the channel in a time-sharing manner; the method comprises the following steps.
And step S61, acquiring parameter information of the single batteries in the battery pack through the acquisition module.
Step S62, according to parameter information of the single batteries in the battery pack, when it is determined by the control module that the single batteries in the battery pack need to be equalized, obtaining a target equalization duration and an equalization duty ratio of the single batteries needing to be equalized, where the equalization duty ratio is a ratio of an equalization time period of the single batteries needing to be equalized to a unit cycle, and the unit cycle includes the equalization time period and an acquisition time period.
And step S63, the control module controls the single battery needing to be started for balancing to discharge to the storage battery according to the target balancing duration and the balancing duty ratio of the single battery needing to be started for balancing.
With regard to the battery equalization method in the above-mentioned embodiment, the specific manner of each step has been described in detail in the embodiment related to the battery equalization system, and will not be elaborated here.
The present disclosure also provides a computer readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement the battery equalization method described above.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, various possible combinations will not be separately described in this disclosure.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims (14)

1. A battery equalization system, comprising:
the acquisition module is used for acquiring parameter information of the single batteries in the battery pack;
the balancing module is used for carrying out balancing processing on the single batteries needing to be balanced through a storage battery, and the storage battery is connected with the single batteries in the battery pack;
the control module is used for controlling the balancing module to discharge to the storage battery through the single battery needing to be started for balancing when the single battery in the battery pack is determined to need to be started for balancing according to the parameter information of the battery pack,
the balancing module comprises a balancing circuit, the balancing circuit comprises discharge branches connected with each single battery in the battery pack in parallel, the discharge branches correspond to the single batteries one by one, and each discharge branch is connected with the storage battery; each discharging branch is provided with a direct-current voltage converter, the low-voltage input end of the direct-current voltage converter is connected to the anode of the single battery, and the high-voltage output end of the direct-current voltage converter is connected to the anode of the storage battery.
2. The battery equalization system according to claim 1, wherein each discharging branch is further provided with a switch controlled by the control module; when the switch is switched on under the control of the control module, the discharging branch where the switch is located is switched on, so that the single batteries needing to be started and balanced are discharged to the storage battery.
3. The battery equalization system according to claim 1, wherein the parameter information includes a voltage value of each unit battery;
the control module is used for determining the single batteries needing to be started and balanced in the following modes:
determining the minimum voltage value in the voltage values of all the single batteries in the battery pack as a reference voltage value;
and determining the single battery with the voltage difference value larger than or equal to a preset voltage difference threshold value as the single battery needing to be started for balancing according to the voltage difference value between the voltage value of each single battery in the battery pack and the reference voltage value.
4. The battery equalization system of claim 1, wherein the control module is connected to the acquisition module and the equalization module corresponding to the same cell through two channels.
5. The battery equalization system according to claim 4, wherein the control module comprises a control chip, the control chip is connected to the acquisition module and the equalization module corresponding to the same battery cell through two pins, the two pins correspond to the two channels one to one, one of the two pins is connected to the equalization module through one of the two channels, and the other of the two pins is connected to the acquisition module through the other of the two channels.
6. The battery equalization system of claim 1, wherein the control module is connected to the acquisition module and the equalization module corresponding to the same cell through a channel, and the acquisition module and the equalization module multiplex the channels in time.
7. The battery equalization system of claim 6, wherein the control module comprises a control chip, the control chip is connected to the acquisition module and the equalization module corresponding to the same cell through a pin, and the pin is connected to the equalization module and the acquisition module through the channel.
8. The battery balancing system according to claim 1, wherein the control module is further configured to, when it is determined that a cell in the battery pack needs to start balancing according to the parameter information of the battery pack, obtain a target balancing duration of the cell that needs to start balancing, and control the balancing module to discharge to the storage battery through the cell that needs to start balancing according to the target balancing duration of the cell that needs to start balancing.
9. The battery balancing system according to claim 8, wherein the control module controls the balancing module to discharge the battery to the storage battery through the single battery needing balancing according to the target balancing duration and a balancing duty ratio, the balancing duty ratio is a ratio of a balancing time period of the single battery needing balancing to be started to a unit cycle, and the unit cycle includes the balancing time period and a collecting time period.
10. A vehicle comprising the battery equalization system of any of claims 1-9.
11. A method of balancing a battery, applied to a vehicle comprising a storage battery, characterized in that it comprises:
acquiring parameter information of a single battery in a battery pack;
determining that a single battery in the battery pack needs to be started for balancing according to the parameter information of the single battery in the battery pack;
controlling the single battery needing to be started for balancing to discharge to the storage battery,
before controlling the single battery needing to start balancing to discharge to the storage battery, the method further comprises the following steps:
converting the voltage output by the single batteries needing to be started and balanced into voltage adaptive to the storage battery through a direct-current voltage converter, wherein each single battery in the battery pack is connected with a discharging branch in parallel, the discharging branches correspond to the single batteries one by one, and each discharging branch is connected to the storage battery; each discharging branch is provided with the direct-current voltage converter, the low-voltage input end of the direct-current voltage converter is connected to the anode of the single battery, and the high-voltage output end of the direct-current voltage converter is connected to the anode of the storage battery.
12. The method according to claim 11, wherein the parameter information includes a voltage value of each unit cell;
the determining that there is a single battery in the battery pack that needs to be started for balancing includes:
determining the minimum voltage value in the voltage values of all the single batteries in the battery pack as a reference voltage value;
and determining the single battery with the voltage difference value larger than or equal to a preset voltage difference threshold value as the single battery needing to be started for balancing according to the voltage difference value between the voltage value of each single battery in the battery pack and the reference voltage value.
13. The method of claim 11, wherein the vehicle includes a battery equalization system, the battery equalization system comprising: the system comprises a balancing module, an acquisition module and a control module, wherein the control module is connected with the acquisition module and the balancing module corresponding to the same single battery through a channel, and the acquisition module and the balancing module multiplex the channel in a time-sharing manner;
the parameter information of the single battery in the battery pack is acquired, and the parameter information comprises the following steps:
acquiring parameter information of a single battery in the battery pack through the acquisition module;
the determining that there is a single battery in the battery pack that needs to be started for balancing includes:
according to parameter information of single batteries in the battery pack, when determining that the single batteries in the battery pack need to be balanced, the control module acquires target balancing time length and balancing duty ratio of the single batteries needing to be balanced, wherein the balancing duty ratio is the ratio of the balancing time period of the single batteries needing to be balanced to a unit cycle, and the unit cycle comprises the balancing time period and an acquisition time period;
the control of the discharge of the single battery needing to be started for balancing to the storage battery comprises the following steps:
and the control module controls the balancing module to discharge the storage battery through the single battery needing to be balanced according to the target balancing time length and the balancing duty ratio of the single battery needing to be balanced.
14. A computer-readable storage medium having stored thereon computer program instructions, which, when executed by a processor, implement the battery equalization method of any of claims 11-13.
CN201710773454.6A 2017-08-31 2017-08-31 Battery equalization system, vehicle, battery equalization method, and storage medium Active CN110015182B (en)

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