WO2019042362A1 - Battery equalization system, vehicle, battery equalization method, and storage medium - Google Patents

Abstract

A battery equalization system, a vehicle, a battery equalization method, and a storage medium. The battery equalization system comprises: acquisition modules (12) used for acquiring parameter information of cells (111) in a battery pack (11); equalization modules (13) used for equalizing, by means of a storage battery (33), the cells (111) needing to be equalized, the storage battery (33) be connected to the cells (111) in the battery pack (11); control modules (14) used for controlling, when determining, according to the parameter information of the battery pack (11), there are cells (111) needing to be equalized in the battery pack (11), the equalization modules (13) to release power to the storage battery (33) by means of the cells (111) needing to be equalized. By controlling the equalization modules (13), the power of the cells (111) needing to be equalized is released to the storage battery (33), so that the technical problem in the related art of waste of electric energy during equalization of a battery equalization system by means of passive equalization is resolved.

Description

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

Cross-reference to related applications

This application claims the priority of the Chinese patent application No. "201710773454.6" filed by the BYD Co., Ltd. on August 31, 2017, entitled "Battery Equalization System, Vehicle, Battery Equalization Method and Storage Medium".

Technical field

The present application relates to the field of battery pack equalization, and in particular to a battery equalization system, a vehicle, a battery equalization method, and a storage medium.

Background technique

In electric vehicles, the power battery pack is an important part of it. Since the battery pack is formed by connecting a plurality of single cells in series, the difference between the cells in the battery pack gradually increases with the use of the battery, resulting in poor consistency between the battery cells. Due to the short board effect of the battery, the battery pack capacity cannot be fully utilized, resulting in a decrease in the overall capacity of the battery pack. Therefore, effective balancing management of the electric vehicle battery pack is beneficial to improve the consistency of each unit battery in the power battery pack, reduce the battery capacity loss, extend the battery life and the driving range of the electric vehicle. The meaning.

In the practical application of the related equalization technology, the battery equalization system usually adopts a passive equalization method, that is, a resistor is connected in parallel across the respective battery cells. When the balance is required, the power of the battery with more power is discharged through the resistor to achieve a The battery has a consistent effect with less battery.

In the equalization system of the related art, due to the passive equalization method, when the battery equalization system is equalized, the amount of electricity discharged by the battery with more electric power is converted into heat of the resistance, thereby causing waste of electric energy.

Application content

The purpose of the present application 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 that a battery equalization system adopting a passive equalization method in the related art has a waste of power during equalization.

To achieve the above objective, the present application provides a battery equalization system, where the battery equalization system includes:

An acquisition module, configured to collect parameter information of the single battery in the battery group;

An equalization module, configured to perform equalization processing on a single battery that needs to be balanced by a battery, where the battery is connected to a single battery in the battery;

And a control module, configured to: when determining, according to the parameter information of the battery pack, that a single battery in the battery pack needs to be turned on, the equalization module is controlled to be discharged to the battery by the single battery that needs to be turned on.

Optionally, the equalization module includes an equalization circuit, and the equalization circuit includes a discharge branch connected in parallel with each of the battery cells, and the discharge branch corresponds to the single battery. And each of the discharge branches is connected to the battery; each of the discharge branches is provided with a DC voltage converter, and a low voltage input end of the DC voltage converter is connected to a positive pole of the single battery The high voltage output of the DC voltage converter is connected to the positive pole of the battery.

Optionally, each of the discharge branches further has a switch controlled by the control module; when the switch is turned on under the control of the control module, the discharge branch where the switch is located is turned on So that the unit cells that need to be turned on are discharged to the battery.

Optionally, the parameter information includes voltage values of the respective single cells;

The control module is configured to determine, by using the following manner, the single battery that needs to be turned on:

Determining a minimum voltage value among voltage values of each of the battery cells in the battery pack as a reference voltage value;

Determining, according to a voltage difference between a voltage value of each of the single cells in the battery pack and the reference voltage value, a cell having a voltage difference greater than or equal to a preset voltage difference threshold as the need to open equalization Single battery.

Optionally, the control module is respectively connected to the acquisition module and the equalization module corresponding to the same single cell through two channels.

Optionally, the control module includes a control chip, and the control chip is respectively connected to an acquisition module and an equalization module corresponding to the same single cell through two pins, and the two pins are connected to the two channels. Correspondingly, one of the two pins is connected to the equalization module through one of the two channels, and the other of the two pins passes through the two channels. Another channel is connected to the acquisition module.

Optionally, the control module is connected to the acquisition module and the equalization module corresponding to the same single cell through a channel, and the acquisition module and the equalization module time-multiplex the channels.

Optionally, the control module includes a control chip, and the control chip is connected to an acquisition module and an equalization module corresponding to the same single cell through a pin, and the pin passes through the channel and the equalization module and the The acquisition module is connected.

Optionally, the control module is further configured to: when determining, according to the parameter information of the battery pack, that a single battery in the battery pack needs to be turned on, obtain a target equalization time of the single battery that needs to be turned on, And controlling the equalization module to discharge the unit battery that needs to be balanced to the battery according to the target equalization duration of the unit cell that needs to be turned on.

Optionally, the control module controls, according to the target equalization duration and the equalization duty ratio, that the equalization module turns on the discharge branch corresponding to the unit cell that needs to be turned on, so that the required balance is required to be turned on. The unit cell is discharged to the battery, and the equalization duty ratio is a ratio of an equalization period to a unit period of the unit cells that need to be equalized, and the unit period includes the equalization period and an acquisition period .

The application also provides a vehicle including the battery equalization system described above.

The application also provides a battery equalization method for a vehicle including a battery, the method comprising:

Collecting parameter information of the single battery in the single battery in the battery pack;

Determining, according to parameter information of the single battery in the battery pack, that a single battery in the battery pack needs to be turned on;

Controlling the battery cells that need to be turned on to discharge to the battery.

Optionally, before controlling the discharging of the unit battery that needs to be turned on to the battery, the method further includes:

The voltage of the output of the unit cell that needs to be turned on is passed through a DC voltage converter to be converted into a voltage that is adapted to the battery.

Optionally, the parameter information includes voltage values of the respective single cells;

Determining that a single battery in the battery pack needs to be turned on, including:

Determining a minimum voltage value among voltage values of each of the battery cells in the battery pack as a reference voltage value;

Determining, according to a voltage difference between a voltage value of each of the single cells in the battery pack and the reference voltage value, a cell having a voltage difference greater than or equal to a preset voltage difference threshold as the need to open equalization Single battery.

Optionally, the vehicle includes a battery equalization system, and the battery equalization system includes: an equalization module, an acquisition module, and a control module, wherein the control module is connected to the acquisition module and the equalization module corresponding to the same single battery through one channel, The acquisition module and the equalization module time-multiplex the channels;

The collecting parameter information of the single battery in the single battery in the battery pack includes:

Collecting, by the collecting module, parameter information of the single battery in the battery group;

Determining that a single battery in the battery pack needs to be turned on, including:

According to the parameter information of the single battery in the battery pack, when the control module determines that a single battery in the battery pack needs to be turned on, the target equalization time and balance of the single battery that needs to be balanced are obtained. a ratio of the equalization period to the unit period of the unit cell that needs to be turned on, and the unit period includes the equalization period and the acquisition period;

The controlling the discharging of the unit battery that needs to be turned on to the battery comprises:

The control module controls the battery cells that need to be turned on to be discharged to the battery according to the target equalization duration and the equalization duty ratio of the unit cells that need to be turned on.

The present application also provides a computer readable storage medium having stored thereon computer program instructions that, when executed by a processor, implement the battery equalization method described above.

The technical solutions provided by the embodiments of the present application may include the following beneficial effects:

In the present application, when it is determined that a single battery in the battery pack needs to be turned on, the single cell that needs to be turned on is discharged to the battery by controlling the equalization module, thereby reducing the consistency between the individual cells in the battery pack. Compared with the equalization scheme of the related art in which the passive equalization method is used for discharging, the energy difference is saved, and the technical problem that the battery equalization system adopting the passive equalization method in the related art has a waste of power during the equalization is solved.

Other features and advantages of the present application will be described in detail in the detailed description which follows.

DRAWINGS

The accompanying drawings are included to provide a further understanding of the invention, In the drawing:

FIG. 1 is a block diagram of 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 of a battery equalization system, according to an exemplary embodiment.

FIG. 4 is a flow chart showing a battery equalization method according to an exemplary embodiment.

FIG. 5 is a flow chart showing a method for determining that a single battery needs to be turned on in a step included in a battery equalization method according to an exemplary embodiment.

FIG. 6 is another flow chart of a battery equalization method according to an exemplary embodiment.

Detailed ways

The specific embodiments of the present application are described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are intended to be illustrative and not restrictive.

FIG. 1 is a block diagram of a battery equalization system according to an exemplary embodiment, and FIG. 2 is a schematic diagram of an equalization circuit of a battery equalization system according to an exemplary embodiment. As shown in FIG. 1 and FIG. 2, the battery equalization system is applied to an automobile including a battery 33. The battery equalization system includes an acquisition module 12, an equalization module 13, and a control module 14, wherein the battery unit 11 is composed of a plurality of cells. The batteries 111 are connected 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 unit cell 111 via two channels 120 , 130 , respectively. The control module 14 includes a control chip, and the control chip is respectively connected to the acquisition module 12 and the equalization module 13 corresponding to the same single cell 111 through two pins, and the two pins and the two channels 120 One-to-one correspondence, one of the two pins is connected to the equalization module 13 through the channel 130, and the other of the two pins passes through the channel 120 and the The acquisition module 12 is connected.

As shown in FIG. 1 , the collecting module 12 is configured to collect parameter information of the single battery 111 in the battery pack 11 , and send the collected parameter information of the battery pack to the control module 14 , the battery pack 11 . The unit cells 111 in the one-to-one correspondence with the acquisition module 12. The parameter information includes information such as a battery voltage and a temperature. The control module 14 controls the acquisition module 12 to collect parameter information of the battery pack 11 by turning on the channel 120.

As shown in FIG. 1 and FIG. 2, the equalization module 13 is configured to perform equalization processing on the single cells 111 in the battery pack 11. When the battery cells 11 have a single cell 111 that needs to be balanced, The channel 130 between the equalization module 13 and the control module 14 is turned on, and the equalization module 13 can be used to connect the unit cells 111 that need to be equalized to the battery 33, thereby passing through the unit that needs to be balanced. The battery 111 charges the battery 33.

Referring to FIG. 1 and FIG. 2, the equalization module 13 includes an equalization circuit including a discharge branch 133 parallel to each of the single cells 111 of the battery pack 11, the discharge branch 133. One-to-one correspondence with the unit cells 111, and each of the discharge branches 133 is connected to the battery 33.

Since the voltage output by the battery 33 is different from the voltage of the single battery 111, each of the discharge branches 133 is provided with a DC voltage converter 134, and the low voltage input terminal of the DC voltage converter 134 Connected to the anode of the unit cell 111, the high voltage output end of the DC voltage converter 134 is connected to the anode of the battery 33, and the voltage outputted by the unit cell 111 is converted by the DC voltage converter 134. To adapt to the voltage of the battery 33. When the single battery 111 in the battery pack 11 needs to be turned on, the control module 14 controls the discharge branch 133 corresponding to the unit cell 111 that needs to be turned on to be turned on.

As shown in FIGS. 1 and 2, each of the discharge 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 switch 135 The discharge branch 133 is turned on, and the battery 33 forms a loop with the unit cell 111 to charge the unit cell 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 determine, when the single battery 111 in the battery pack 11 needs to be turned on, according to the parameter information of the single battery 111 in the battery pack 11, The channel 130 is turned on, and the equalization module 13 is controlled to conduct the discharge branch 133 corresponding to the unit cell 111 that needs to be turned on, so that the unit cell 111 that needs to be turned on is discharged to the Battery 33.

The control module 14 can determine the single-cell battery 111 that needs to be turned on by:

First, according to the voltage value of each of the single cells 111 in the battery pack 11 collected by the collecting module 12, the smallest voltage value among the voltage values of the single cells 111 in the battery pack 11 is used as a reference voltage value. ;

Then, according to the voltage difference between the voltage value of each of the unit cells 111 in the battery pack 11 and the reference voltage value, the unit cell 111 having a voltage difference greater than or equal to the preset voltage difference threshold is determined as It is described that the balanced unit cell 111 needs to be turned on.

Optionally, the control module 14 is configured to determine, when the single battery 111 in the battery pack 11 needs to be turned on, according to the parameter information of the single battery 111 in the battery pack 11, for example, to start balancing according to the requirement. The voltage value of the single cell 111 and the reference voltage value are obtained, and the target equalization time length of the single cell 111 that needs to be turned on is obtained, and the target equalization time length of the balanced cell 111 is turned on according to the need to control the The equalizing module 13 turns on the discharge branch 133 corresponding to the unit cell 111 that needs to be turned on, so that the unit cell 111 that needs to be turned on is discharged to the battery 33.

Further, the control module 14 controls the equalization module 13 to discharge the battery 33 to the battery 33 according to the target equalization duration and the equalization duty ratio, and the equalization duty ratio is The ratio of the equalization period to the unit period of the unit cell 111 that needs to be equalized is described. One unit period includes: the equalization period and the acquisition period. During the collection period, the collection module 12 collects parameter information of the battery pack 11; during the equalization period, the equalization module 13 equalizes the unit cells 111 that need to be balanced in the battery pack 11 deal with.

For example, the acquisition module 12 may determine a minimum voltage value among the voltage values of the single cells 111 of the battery pack 11 as the reference voltage value, and the preset voltage difference threshold may be 5 mV (or Other values). First, the control module 14 compares the minimum voltage value Vmin in each of the single cells 111, and determines whether the difference between the voltage value of each of the single cells 111 of the battery pack 11 and Vmin is less than 5 mV. If so, the battery pack 11 has a good uniformity and does not need to be equalized; if it is greater than 5 mV, the single-cell battery 111 having a difference from Vmin of more than 5 mV is used as the single-cell battery 111 that needs to be turned on. Then, the control module 14 controls the equalization module 13 to turn on the discharge branch 133 corresponding to the unit cell 111 that needs to be turned on, and start discharging to the battery 33.

During the discharge process, the control module 14 can continuously read the voltage information of the unit cell 111 that needs to be turned on, and determine whether the voltage difference between Vmin and the unit cell is less than 5 mV. If yes, disconnect the discharge branch 133 corresponding to the unit cell 111 that needs to be turned on, and the equalization ends; if it is still greater than 5 mV, continue to cyclically read the voltage information of the unit 111 that needs to be turned on. Until the voltage difference between Vmin and the single cell is less than 5 mV, the discharge branch 133 corresponding to the unit cell 111 that needs to be turned on is turned off, and the equalization ends.

After determining the voltage of the unit cell 111 that needs to be turned on, the voltage value and the Vmin of the balanced unit cell 111 can be turned on according to the requirement, and the target equalization period of the unit cell 111 that needs to be balanced can be calculated. And after the start of the discharge, the discharge duration of the unit cell 111 that needs to be turned on is counted, and when the difference between the discharge duration of the unit cell 111 and the target equalization period is within a threshold range, the The discharge branch 133 corresponding to the unit cell 111 that needs to be turned on is turned off, and the equalization ends.

In the present application, when it is determined that a single battery needs to be turned on in the battery pack, the discharge branch corresponding to the single-cell battery that needs to be turned on is turned on by the control equalization module, so that the single that needs to be balanced is turned on. The battery is discharged to the battery, thereby reducing the difference in consistency between the individual cells in the battery pack, and saving energy compared with the equalization scheme using the passive equalization method for discharging in the related art, and solving the passive use in the related art. A balanced battery balancing system has technical problems of wasting power during equalization.

FIG. 3 is another block diagram of a battery equalization system, according to an exemplary embodiment. As shown in FIG. 3 and FIG. 2, the battery equalization system includes an acquisition module 12, an equalization module 13, and a control module 14, wherein the battery pack 11 is formed by connecting a plurality of single cells 111 in series. The difference from the battery equalization system in FIG. 1 is that the control module 14 of the battery equalization system in FIG. 3 is connected to the acquisition module 12 and the equalization module 13 corresponding to the same single cell 111 through a channel 140, the acquisition module. 12 and the equalization module 13 time-multiplex the channel 140.

When the control module 14 determines that the unit cells 111 do not need to be equalized, the control module 14 is connected to the corresponding collection module 12 through the channel 140; or, when the control module 14 determines that the unit cells 111 need to be performed During the equalization, the collection module 12 and the equalization module 13 of the unit cell 111 are time-multiplexed with the channel 140. The control module 14 is connected to the corresponding acquisition module 12 and the equalization module 13 by the channel 140. The control module 14 includes a control chip, and the control chip is connected to the acquisition module 12 and the equalization module 13 corresponding to the same single cell 111 through a pin, and the pin passes through the channel 140 and the equalization module 13 Connected to the acquisition module 12.

Optionally, as shown in FIG. 3 and FIG. 2, the control module 14 controls the equalization module 13 to discharge the battery to the battery through the unit battery that needs to be turned on according to the target equalization duration and the equalization duty ratio. 33. The equalization duty ratio is a ratio of an equalization period and a unit period of the single-cell battery 111 that needs to be turned on, and the unit period includes the equalization period and an acquisition period. In FIG. 3, the equalization duty ratio may also be a ratio of the duration of the channel 140 occupied by the equalization module 13 to the total duration occupied by the channel 140; wherein the total duration of the channel 140 is occupied. The length of time that the equalization module 13 occupies the channel 140 and the duration that the acquisition module 12 occupies the channel 140 are included.

As shown in FIG. 3 and FIG. 2, the control module 14 connects the channel 140 to the acquisition module 12, and further controls the collection module 12 to collect parameter information of the battery pack 11; then, the control module 14 is configured to obtain a target equalization time period of the single-cell 111 that needs to be turned on, when it is determined that the single-cell battery 111 needs to be turned on in the battery pack 11 according to the parameter information of the single-cell battery 111 in the battery pack 11 And equalizing the duty ratio, and connecting the channel 140 to the equalization module 13 corresponding to the unit cell 111 that needs to be turned on. Then, the control module 14 turns on the balanced unit cell 111 according to the need. The equalization interval and the equalization duty ratio control the equalization module 13 turns on the discharge branch 133 corresponding to the unit cell 111 that needs to be turned on, that is, the control module 14 can follow the target equalization time and equalization duty. The conduction time of the switch 135 in FIG. 2 is controlled.

Optionally, the control module 14 determines an equalization period and an acquisition period according to the target equalization duration and the equalization duty, and the sum of the equalization period and the acquisition period is equal to the channel 140 being The total length of time occupied; in the collecting period, the channel 140 is connected to the collecting module 12, so that the collecting module 12 collects parameter information of the battery pack 11; in the equalizing period, the channel The equalization module 13 that needs to perform equalization processing is connected to the 140, and the equalization module 13 is in an on state, so that the equalization module 13 performs equalization processing on the unit cells 111 in the battery pack 11 that need to be equalized.

Since the control module in the present application is time-multiplexed with one channel of the voltage sampling circuit and the equalization module of each unit cell, the number of channels of the control module is reduced, thereby reducing the hardware cost; and due to battery sampling and equalization Separately, the equalization current does not affect the battery voltage, which improves the accuracy of the battery voltage sampling.

The application also provides a vehicle including the battery equalization system described above.

Regarding the vehicle in the above embodiment, the battery equalization system included in the vehicle is described in detail in the embodiment of the above battery equalization system, and will not be described in detail herein.

FIG. 4 is a flow chart showing a battery equalization method according to an exemplary embodiment. As shown in FIG. 5, the battery equalization method is applied to a vehicle including a battery, and the method includes the following steps.

Step S41, collecting parameter information of the single cells in the single cells in the battery pack.

Step S42, determining, according to parameter information of the single battery in the battery pack, that a single battery in the battery pack needs to be turned on.

Step S43, controlling the battery cells that need to be turned on to be discharged to the battery.

Optionally, before controlling the discharging of the unit battery that needs to be turned on to the battery, the method further includes: converting a voltage outputted by the unit that needs to be turned on by a DC voltage converter to convert to a suitable voltage. The voltage applied to the battery.

Optionally, as shown in FIG. 5, the parameter information includes voltage values of the respective single cells, and determining that a single battery in the battery pack needs to be turned on, includes the following steps.

Step S421, determining a minimum voltage value among voltage values of the individual cells in the battery pack as a reference voltage value.

Step S422, determining, according to a voltage difference between a voltage value of each single cell in the battery group and the reference voltage value, a cell having a voltage difference greater than or equal to a preset voltage difference threshold as the need Turn on the balanced single cell.

FIG. 6 is another flow chart of a battery equalization method according to an exemplary embodiment. As shown in FIG. 6 , the vehicle includes a battery equalization system, and the battery equalization system includes: an equalization module, an acquisition module, and a control module, and the control module passes through a channel and an acquisition module and an equalization module corresponding to the same single battery. Connected, the acquisition module and the equalization module time-multiplex the channels; the method includes the following steps.

Step S61, collecting, by the collecting module, parameter information of the single battery in the battery group.

In step S62, according to the parameter information of the single battery in the battery pack, when the control module determines that a single battery in the battery pack needs to be balanced, the target equalization time of the single battery that needs to be balanced is obtained. And an equalization duty ratio, wherein the equalization duty ratio is a ratio of an equalization period to a unit period of the unit cells that need to be turned on, and the unit period includes the equalization period and an acquisition period.

In step S63, the control module controls the battery cells that need to be turned on to be discharged to the battery according to the target equalization duration and the equalization duty ratio of the unit cells that need to be turned on.

Regarding the battery equalization method in the above embodiment, the specific manner of each step has been described in detail in the embodiment relating to the battery equalization system, and will not be described in detail herein.

The present application also provides a computer readable storage medium having stored thereon computer program instructions that, when executed by a processor, implement the battery equalization method described above.

The preferred embodiments of the present application are described in detail above with reference to the accompanying drawings. However, the present application is not limited to the specific details in the foregoing embodiments, and various simple modifications may be made to the technical solutions of the present application within the technical concept of the present application. These simple variations are within the scope of this application.

It should be further noted that the specific technical features described in the above specific embodiments may be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present application will not be further described in various possible combinations.

In addition, any combination of various embodiments of the present application may be made as long as it does not contradict the idea of the present application, and it should also be regarded as the content disclosed in the present application.

Claims (16)

1. A battery equalization system, characterized in that the battery equalization system comprises:

   An acquisition module, configured to collect parameter information of the single battery in the battery group;

   An equalization module, configured to perform equalization processing on a single battery that needs to be balanced by a battery, where the battery is connected to a single battery in the battery;

   And a control module, configured to: when determining, according to the parameter information of the battery pack, that a single battery in the battery pack needs to be turned on, the equalization module is controlled to be discharged to the battery by the single battery that needs to be turned on.
2. The battery equalization system according to claim 1, wherein said equalization module comprises an equalization circuit, said equalization circuit comprising a discharge branch connected in parallel with each of said battery cells, said discharge The branch circuit is in one-to-one correspondence with the single cells, and each of the discharge branches is connected to the battery; each of the discharge branches is provided with a DC voltage converter, and the DC voltage converter has a low voltage The input end is connected to the positive pole of the unit cell, and the high voltage output end of the DC voltage converter is connected to the positive pole of the battery.
3. A battery equalization system according to claim 2, each of said discharge branches further provided with a switch controlled by said control module; said switch being turned on when said switch is turned on under the control of said control module The discharge branch is turned on to discharge the unit cell that needs to be turned on to the battery.
4. The battery equalization system according to any one of claims 1 to 3, wherein the parameter information includes a voltage value of each of the single cells;

   The control module is configured to determine, by using the following manner, the single battery that needs to be turned on:

   Determining a minimum voltage value among voltage values of each of the battery cells in the battery pack as a reference voltage value;

   Determining, according to a voltage difference between a voltage value of each of the single cells in the battery pack and the reference voltage value, a cell having a voltage difference greater than or equal to a preset voltage difference threshold as the need to open equalization Single battery.
5. The battery equalization system according to any one of claims 1 to 4, wherein the control module is respectively connected to an acquisition module and an equalization module corresponding to the same single cell through two channels.
6. The battery equalization system according to claim 5, wherein the control module comprises a control chip, and the control chip is respectively connected to an acquisition module and an equalization module corresponding to the same single cell through two pins, Two pins are in one-to-one correspondence with the two channels, and one of the two pins is connected to the equalization module through one of the two channels, of the two pins Another pin is coupled to the acquisition module through another of the two channels.
7. The battery equalization system according to any one of claims 1 to 4, wherein the control module is connected to an acquisition module and an equalization module corresponding to the same single cell through a channel, and the acquisition module and the equalization module are divided. The channels are multiplexed.
8. The battery equalization system according to claim 7, wherein the control module comprises a control chip, and the control chip is connected to an acquisition module and an equalization module corresponding to the same single cell through a pin, the pin Connecting to the equalization module and the acquisition module through the channel.
9. The battery equalization system according to any one of claims 1 to 8, wherein the control module is further configured to: when determining, according to the parameter information of the battery pack, that a single battery in the battery pack needs to be turned on, Obtaining a target equalization duration of the single-cell battery that needs to be turned on, and controlling the equalization duration of the balanced single-cell battery according to the need to control the equalization module to discharge the single-cell battery by the need to turn on the equalization Battery.
10. The battery equalization system according to claim 9, wherein the control module controls the equalization module to discharge the battery to the battery through the unit battery that needs to be turned on according to the target equalization duration and the equalization duty ratio. The equalization duty ratio is a ratio of an equalization period to a unit period of the single battery that needs to be turned on, and the unit period includes the equalization period and an acquisition period.
11. A vehicle characterized by comprising the battery equalization system of any of claims 1-10.
12. A battery equalization method for a vehicle including a battery, characterized in that the method comprises:

    Collecting parameter information of the single battery in the single battery in the battery pack;

    Determining, according to parameter information of the single battery in the battery pack, that a single battery in the battery pack needs to be turned on;

    Controlling the battery cells that need to be turned on to discharge to the battery.
13. The method according to claim 12, wherein the method further comprises: before controlling the discharge of the unit cell that needs to be turned on to the battery, the method further comprising:

    The voltage of the output of the unit cell that needs to be turned on is passed through a DC voltage converter to be converted into a voltage that is adapted to the battery.
14. The method according to claim 12, wherein said parameter information comprises voltage values of respective individual cells;

    Determining that a single battery in the battery pack needs to be turned on, including:

    Determining a minimum voltage value among voltage values of each of the battery cells in the battery pack as a reference voltage value;

    Determining, according to a voltage difference between a voltage value of each of the single cells in the battery pack and the reference voltage value, a cell having a voltage difference greater than or equal to a preset voltage difference threshold as the need to open equalization Single battery.
15. The method according to any one of claims 12 to 14, wherein the vehicle comprises a battery equalization system, and the battery equalization system comprises: an equalization module, an acquisition module and a control module, wherein the control module passes through a channel The acquisition module and the equalization module are connected to the same single battery, and the acquisition module and the equalization module time-multiplex the channels;

    The collecting parameter information of the single battery in the single battery in the battery pack includes:

    Collecting, by the collecting module, parameter information of the single battery in the battery group;

    Determining that a single battery in the battery pack needs to be turned on, including:

    According to the parameter information of the single battery in the battery pack, when the control module determines that a single battery in the battery pack needs to be turned on, the target equalization time and balance of the single battery that needs to be balanced are obtained. a ratio of the equalization period to the unit period of the unit cell that needs to be turned on, and the unit period includes the equalization period and the acquisition period;

    The controlling the discharging of the unit battery that needs to be turned on to the battery comprises:

    The control module controls the equalization module to discharge the battery through the unit battery that needs to be turned on and equalized according to the target equalization duration and the equalization duty ratio of the unit cells that need to be turned on.
16. A computer readable storage medium having stored thereon computer program instructions, wherein the program instructions, when executed by a processor, implement the battery equalization method of any of claims 12-15.

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