CN115733209A

CN115733209A - Control method of battery system, battery system and battery management system

Info

Publication number: CN115733209A
Application number: CN202211390770.2A
Authority: CN
Inventors: 施海驹; 黄成成
Original assignee: Suzhou Renogy New Energy Technoogy Co ltd
Current assignee: Suzhou Renogy New Energy Technoogy Co ltd
Priority date: 2022-11-07
Filing date: 2022-11-07
Publication date: 2023-03-03

Abstract

The disclosure relates to a control method of a battery system, the battery system and a battery management system, and relates to the field of new energy. The present disclosure provides a control method of a battery system, the battery system including a control host and at least one battery pack connected to the control host, the control method applied to the control host, including: acquiring first state information of each battery pack in a battery system; determining whether a battery pack which needs to be subjected to temperature control exists according to the first state information; and in response to the fact that at least one battery pack needing temperature control exists, controlling the thermal management module corresponding to each battery pack to carry out temperature control.

Description

Control method of battery system, battery system and battery management system

Technical Field

The disclosure relates to the technical field of new energy, and particularly relates to a control method of a battery system, the battery system and a battery management system.

Background

At present, when a plurality of battery packs are connected in series in the using process of a user, the situation of unbalanced electric quantity can be caused when a certain battery pack needs to be started to heat a module or cool a module.

Because each single battery pack is provided with the BMS, the temperature measurement module and the thermal management module are independent, the temperature measurement precision is usually 1 ℃, if no additional measures are taken, when the temperature is right near the threshold value of the thermal management module to be started or closed, the heating modules of the existing part of battery packs are started, and the heating modules of the part of battery packs are closed; or the cooling module of part of the battery pack is opened, and the cooling module of part of the battery pack is closed. In other possible situations, the temperature of each battery pack is different due to different environments of each battery pack, so that the situation that part of the battery packs trigger the thermal management requirement and part of the battery packs do not need to be thermally managed also occurs.

In some implementation schemes, each battery pack can be provided with an independent control module and a temperature control strategy, and once the battery pack detects that the temperature of the battery pack is lower than a charging/discharging low-temperature threshold or higher than a charging/discharging high-temperature threshold, the battery pack starts a thermal management module of the battery pack and heats or cools the battery pack according to a preset temperature control strategy; in this case, in a battery system formed of a plurality of battery packs, some of the battery packs may not be heated or cooled.

Under the conditions, when the battery pack is charged or discharged at low temperature or high temperature, the battery pack with short starting time of the thermal management module has more charging electric quantity or less discharging electric quantity; and the battery pack with the thermal management module being started for a long time has less charging electric quantity or more discharging electric quantity. As the number of charging or discharging times increases, the amount of electricity between the battery packs becomes more unbalanced.

Disclosure of Invention

In order to solve the problems in the related art, the present disclosure provides a control method of a battery system, and a battery management system.

According to a first aspect of the present disclosure, there is provided a control method for a battery system, the battery system including a control host and at least one battery pack connected to the control host, the control method being applied to the control host and including:

acquiring first state information of each battery pack in a battery system;

determining whether a battery pack needing temperature control exists according to the first state information;

and in response to the fact that at least one battery pack needing temperature control exists, controlling the thermal management module corresponding to each battery pack to control the temperature.

Optionally, the battery pack requiring temperature control includes a battery pack requiring heating and a battery pack requiring cooling;

the step of controlling the thermal management module corresponding to each battery pack to perform temperature control in response to determining that at least one battery pack requiring temperature control exists includes:

if at least one battery pack needing to be heated is determined to exist, controlling a heating module corresponding to each battery pack to be started to heat each battery pack; and/or the presence of a gas in the gas,

and if at least one battery pack needing cooling is determined to exist, controlling a cooling module corresponding to each battery pack to be started so as to cool each battery pack.

Optionally, the obtaining first state information of each battery pack in the battery system includes:

responding to the battery system access charging equipment, and acquiring temperature information of each battery pack in the battery system; or the like, or, alternatively,

and responding to the battery system to access the electric equipment, and acquiring the temperature information of each battery pack in the battery system.

Optionally, the method further comprises:

continuously acquiring second state information of each battery pack;

determining whether a battery pack meeting a preset charging condition or a preset discharging condition exists according to the second state information;

and controlling to start charging or discharging each battery pack in response to the fact that each battery pack meets a preset charging condition or a preset discharging condition.

Optionally, after the controlling starts to charge or discharge the battery pack, the controlling further includes:

continuously acquiring third state information of each battery pack in the battery system;

determining whether a battery pack which needs to be subjected to temperature control still exists according to the third state information;

and controlling to close the thermal management module corresponding to each battery pack in response to the fact that the temperature of each battery pack does not need to be controlled.

Optionally, before the obtaining the first state information of each battery pack in the battery system, the method further includes:

the first battery pack responds to power-on startup and sends a first handshake request frame;

and if the first battery pack does not receive a first handshake response frame within a first preset time length of sending the first handshake request frame, using the first battery pack as a control host of the battery system, wherein the first handshake response frame is sent by other battery packs in response to receiving the first handshake request frame, and the other battery packs are battery packs in the battery system except the first battery pack.

Optionally, the method further comprises:

if the first battery pack does not receive a second handshake request frame after keeping a second preset duration, confirming each slave battery pack according to all currently received second handshake request frames, wherein the second handshake request frames are sent by other battery packs in response to power-on startup;

the first battery pack acquires the electric quantity information of the first battery pack and the electric quantity information of each slave battery pack;

and if the electric quantity information of each slave battery pack represents that the residual electric quantity value of the residual electric quantity of a third battery pack in each slave battery pack is the largest and is greater than the residual electric quantity of the first battery pack, the first battery pack hands over the control host to the third battery pack.

Optionally, if the first battery pack keeps that the second preset duration does not receive the second handshake request frame, determining each slave according to all currently received second handshake request frames, including:

and after the first battery pack sends the first preset duration of the first handshake request frame, responding to the reception of a second handshake request frame, sending a second handshake response frame to a second battery pack which sends the second handshake request frame, and determining that the second battery pack is a slave battery pack.

According to a second aspect of the present disclosure, there is provided a battery system including a plurality of battery packs and a control system including:

the acquisition module is used for acquiring first state information of each battery pack in the battery system;

the determining module is used for determining whether a battery pack needing temperature control exists according to the first state information;

and the control module is used for controlling the thermal management module corresponding to each battery pack to perform temperature control in response to the fact that at least one battery pack needing temperature control exists.

According to a third aspect of the present disclosure, there is provided a battery management system, comprising a storage module storing a computer program and a processing module implementing the control method of any one of the first aspects of the present disclosure when the computer program is executed by the processing module.

Compared with the prior art, the beneficial effects provided by the invention comprise: by acquiring the state information of each battery pack and determining that the battery packs need to be subjected to temperature management according to the state information, the battery packs are cooperatively controlled to heat or cool all the battery packs, the problem of unbalanced charge and discharge electric quantity caused by unbalanced temperature of each battery pack can be effectively solved, and the service life of a battery system and the user experience are effectively improved.

The above summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. The above summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter. The claimed subject matter is not limited to implementations that solve any or all disadvantages noted in the background.

Drawings

The above and other features, advantages and aspects of various embodiments of the present disclosure will become more apparent by referring to the following detailed description when taken in conjunction with the accompanying drawings. Throughout the drawings, the same or similar reference numbers refer to the same or similar elements. It should be understood that the drawings are schematic and that elements and features are not necessarily drawn to scale. In the drawings:

fig. 1 is a flowchart illustrating a control method of a battery system according to an exemplary embodiment.

Fig. 2 is a flow chart illustrating control of a battery system according to an exemplary embodiment.

FIG. 3 is a flow chart illustrating a host election method according to one exemplary embodiment.

FIG. 4 is a schematic diagram illustrating a control system according to an exemplary embodiment.

FIG. 5 is a schematic diagram illustrating an electronic device in accordance with an example embodiment.

Fig. 6 is a schematic diagram illustrating a structure of a battery pack according to an exemplary embodiment.

Fig. 7 is a schematic diagram illustrating a configuration for charging a battery system according to an exemplary embodiment.

Detailed Description

Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the present disclosure are shown in the drawings, it is to be understood that the present disclosure may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but rather are provided for a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the disclosure are for illustration purposes only and are not intended to limit the scope of the disclosure.

It should be understood that the various steps recited in the method embodiments of the present disclosure may be performed in a different order, and/or performed in parallel. Moreover, method embodiments may include additional steps and/or omit performing the illustrated steps. The scope of the present disclosure is not limited in this respect.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. 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 invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, the terms "first", "second", and the like are used only for distinguishing the description, and are not intended to indicate or imply relative importance.

In the description of the present invention, it is also to be noted that, unless otherwise explicitly stated or limited, the terms "disposed" and "connected" are to be interpreted broadly, and for example, "connected" may be a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; the connection may be direct or indirect via an intermediate medium, and may be a communication between the two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The following describes in detail embodiments of the present invention with reference to the drawings.

Fig. 6 is a schematic diagram illustrating a structure of a battery pack according to an exemplary embodiment of any one of the battery packs in the battery system according to the embodiment of the present disclosure, and as shown in fig. 6, the battery pack 100 may include a battery management systemSystem (Battery Management System, BMS), cell module P, charging switch tube M _{Charging device} And a discharge switching tube M _Put Isolation communication module and thermal management switch tube S _{Heat generation} And a thermal management module.

The cell module P may be formed by connecting a plurality of cell units in series and in parallel. Charging switch tube M _{Charging (CN)} Discharge switch tube M _Put And a thermal management switching tube S _{Heat generation} May be a MOS Transistor (MOSFET, metal-Oxide-Semiconductor Field-Effect Transistor), or may be other switching devices, which is not limited in this disclosure.

As shown in fig. 6, the battery management system BMS may be respectively connected to the cell module P and the charging switch tube M _{Charging device} Discharge switch tube M _{Placing the} Isolation communication module and thermal management switch tube S _{Heat generation} Electric connection, charging switch tube M _{Charging device} And a discharge switching tube M _Put The other end of the battery cell module P is used as an output negative electrode of the battery pack; thermal management switching tube S _{Heat generation} And the heat management module is connected to two ends of the cell module P in series.

In some examples, multiple battery packs may be connected to a communication bus, such as a CAN bus, for isolated communication via an isolated communication module.

In still other examples, the battery management system BMS may be used to detect status information (e.g., voltage, current, temperature, etc.) of the cell modules P, to transmit information to other battery packs or a control host through the isolated communication module, and to control the charging switch tube M _{Charging device} Discharge switch tube M _Put And a thermal management switching tube S _{Heat generation} To control the charging state and the discharging state of the battery pack 100 and the on-off state of the thermal management module.

In some examples, the thermal management module may include a heating module, which may be, for example, a PTC (Positive Temperature Coefficient) heater or a heating membrane, and/or a cooling module, which may be a liquid cooling system or a heat dissipation fan.

In other examples, in the case that the battery system is connected to the charging device, the thermal management module may provide, by the charging device, the electric energy required for thermal management, and in the case that the battery system is not connected to the charging device or the electric device, the thermal management module may provide, by the cell module P, the electric energy required for thermal management.

In still other examples, a battery system may be formed using a plurality of battery packs as shown in fig. 6 connected in series and parallel with each other according to a desired system voltage and capacity, and ports of the respective battery packs may be connected to each other using conductors such as power lines, copper bars, etc. during the series and parallel connection.

Fig. 7 is a schematic structural diagram illustrating a battery system according to an exemplary embodiment, and as shown in fig. 7, the battery system includes a plurality of battery packs 100, where the plurality of battery packs 100 are connected in series after being connected in parallel two by two to a power bus, and the power bus may be used to be connected to a charger or a power consumption device to charge each battery pack 100 in the battery system, or each battery pack 100 supplies power to the power consumption device to enable the power consumption device to operate. In addition, referring to fig. 7, the battery system further includes a communication bus to which the isolated communication module of each battery pack 100 is connected, which may be a CAN bus, an RS485 electrical bus, or the like in one example, which is not limited by the present disclosure.

It is understood that only 6 battery packs 100 are shown in fig. 7, and in practical applications, the battery system may include one or any number of battery packs, which is not limited by the disclosure.

In addition, fig. 7 only shows one possible connection manner of the battery packs 100, and in other alternative embodiments, the battery packs 100 may be directly connected in series, or the battery packs 100 may be all connected in parallel, and so on.

It should be noted that each battery pack 100 in the battery system is an independent product unit, and a user may independently perform charging and discharging after purchasing the battery pack 100, or may form a battery system to supply power to the outside after connecting n battery packs 100 in series and parallel.

Fig. 1 is a flowchart illustrating a control method of a battery system including a control host and at least one battery pack connected to the control host according to an exemplary embodiment, the control method being applied to the control host.

Specifically, each battery pack in the battery system may communicate through an isolated RS485 or an isolated CAN bus, and a master-slave relationship exists, that is, the battery system may include a control master and a slave battery pack. The control host and the battery pack can be electrically connected or in communication connection. The control host may be a peripheral host, for example, a display controller (for a user to view the condition of each battery pack), or may be any one of a plurality of battery packs, which is not specifically limited by the present disclosure. In addition, it should be noted that, a plurality of battery packs in the battery system may be connected in series, may also be connected in parallel, and may also be connected in a mixed series-parallel manner, which is not specifically limited by the present disclosure. In this embodiment, each battery pack in the battery system has an independent temperature sensor inside, and when a single battery pack is used independently, the battery pack can be automatically controlled by its internal BMS according to the battery core temperature acquired by the temperature sensor and the charging and discharging conditions of the battery pack. However, when a plurality of battery packs are connected in series and in parallel to form a system, it is difficult to ensure that the temperatures of the battery cells in all the battery packs are consistent or the measured values are consistent due to measurement errors existing in the installation positions of the battery packs and the temperature sensors on site, so that the time required for switching the temperature control units on and off for each battery pack is inconsistent, and a control host is required to perform unified cooperative control.

As shown in fig. 1, the method includes:

s101, first state information of each battery pack in the battery system is obtained.

The step S101 may be periodically executed, and the period for acquiring the status information of each battery pack may be determined according to the actual requirement or the capability of the executing entity, and may be, for example, 0.1 second, 0.5 second, or 1 second. The State information may specifically include voltage information, current information, temperature information, SOC (State Of Charge) information, and the like Of the battery pack, and preferably, the first State information in the present embodiment refers to temperature information Of each battery pack.

It should be noted that the first status information and the second status information and the third status information described below may be the same, and only differ in the acquisition time.

In some optional embodiments, obtaining the first state information of each battery pack in the battery system includes:

responding to the battery system access charging equipment, and acquiring temperature information of each battery pack in the battery system; or responding to the battery system to access the electric equipment, and acquiring the temperature information of each battery pack in the battery system.

Each battery pack can only have one temperature sensor to provide one temperature value, and each battery pack can also have a plurality of temperature sensors, and each sensor provides the temperature of different battery cores in the battery pack. The temperature information may be indicative of one or more temperature values detected by the temperature sensor.

It should be noted that, in this optional embodiment, the battery system executes the steps of the control method when accessing the charging device or the electrical device, so that it can be ensured that whether temperature control is needed before the battery system performs charging and discharging, cooperative control of each battery pack is performed in advance, and imbalance of electric quantity of each battery pack due to asynchronous charging and discharging is avoided.

And S102, determining whether a battery pack needing temperature control exists according to the first state information.

For example, whether a battery pack requiring temperature control exists may be determined according to temperature information in the status information, for example, if the temperature information of a certain battery pack indicates that the temperature of the certain battery pack is lower than the ideal charging minimum temperature threshold, it may be determined that the battery pack requires temperature control, or if the temperature information of a certain battery pack indicates that the temperature of the certain battery pack is higher than the ideal charging maximum temperature threshold, it may also be determined that the battery pack requires temperature control.

And S103, in response to the fact that at least one battery pack needing temperature control exists, controlling the thermal management module corresponding to each battery pack to control the temperature.

In an exemplary embodiment, the battery pack requiring temperature includes a battery pack requiring heating and a battery pack requiring cooling;

the step of controlling the thermal management module corresponding to each battery pack to perform temperature control in response to determining that at least one battery pack requiring temperature control exists includes: if at least one battery pack needing to be heated is determined to exist, controlling a heating module corresponding to each battery pack to be started so as to heat each battery pack; and/or if at least one battery pack needing cooling is determined to exist, controlling the cooling module corresponding to each battery pack to be started so as to cool each battery pack.

That is, the thermal management module may include a heating module and/or a cooling module, each battery pack is correspondingly provided with a heating module and/or a cooling module, the heating module may be, for example, a PTC heater or a heating film, and the cooling module may be a liquid cooling system or a cooling fan. So that the cooperative temperature control can be uniformly carried out, and the capacity of carrying out temperature management independently can be provided.

It is understood that the steps S102 to S103 may be repeatedly executed, and specifically, may be periodically executed according to a period of acquiring the status information of each battery pack until the battery system is completely charged or disconnected from the electric device.

In addition, it is worth to be noted that, before the method provided by the embodiment of the present disclosure is executed, all the battery packs may be shut down, and connected in series or in parallel as needed, and connected to a communication line, for example, a CAN bus or an RS485 electrical line. Then, each battery pack is powered on after being started up in sequence, and the control host executes the method provided by the embodiment of the disclosure.

In the embodiment of the disclosure, by acquiring the state information of each battery pack and performing cooperative control on the plurality of battery packs according to the state information when the temperature management is required on the battery packs, all the battery packs are heated or cooled, the problem of unbalanced charge and discharge electric quantity caused by unbalanced temperature of each battery pack can be effectively avoided, and the service life of the battery system and the user experience are effectively improved.

In some optional embodiments, the control method further comprises:

continuously acquiring second state information of each battery pack;

The charging or discharging of each battery pack can be controlled by controlling the state of a charging and discharging switching tube, and the charging and discharging switching tube can be a charging and discharging MOS tube. When the control host is a battery pack, the BMS of the control host can directly control the on-off state of the charging and discharging MOS tube of the control host. When the control host needs to control the charging and discharging MOS tube of the slave, a control signal can be sent through the communication connection established with the slave, and after the BMS of the slave receives the control signal, the charging and discharging MOS tube is conducted according to the control signal, so that the external charging equipment starts to charge the battery cell or the battery cell discharges the external electric equipment.

In some possible embodiments, the control host controls the thermal management module corresponding to each battery pack to perform temperature management, and at the same time, the control host may also control all the slaves and their own charging and discharging MOS transistors to be turned off, so as to suspend charging or discharging, and to ensure safety performance when heating or cooling the battery pack.

In some possible embodiments, the preset charging condition may be that all the battery packs do not need to be temperature-controlled any more, and specifically, the temperature of each battery pack in the battery system may be within a certain preset temperature range. That is, under the condition that the temperature of each battery pack in the battery system is determined to be within a certain preset temperature range, the heating module or the cooling module of each battery pack can be turned off, and the charging and discharging MOS tube of each battery pack is controlled to be turned on to perform charging or discharging. The preset temperature range means that the battery pack can be normally charged and discharged in the temperature range without being interfered by the external environment temperature, and the performance of the battery is not greatly influenced by the external environment temperature. It should be noted that, in some application scenarios, each battery pack constituting the battery system may be a battery pack of a different type or a different specification, and thus the preset charging condition or the preset discharging condition of each battery pack may be different. For example, the preset temperature range may be 0 ℃ to 40 ℃ for a lithium iron phosphate battery, and-5 ℃ to 30 ℃ for a ternary lithium battery. Therefore, it should be emphasized that, in the present embodiment, the determining whether there is a battery pack that satisfies the preset charging condition or the preset discharging condition according to the second state information means determining whether the preset charging condition or the preset discharging condition corresponding to the battery pack is satisfied according to the second state information of each battery pack; the responding that each battery pack meets the preset charging condition or the preset discharging condition means responding that each battery pack meets the preset charging condition or the preset discharging condition corresponding to the battery pack.

In other possible embodiments, the preset charging condition may be that all the battery packs meet the charging temperature, for example, in a low-temperature charging scenario, each battery pack is higher than the ideal charging minimum temperature threshold, that is, in a case that it is determined that the temperature of each battery pack in the battery system is higher than the ideal charging minimum temperature threshold and lower than the ideal charging temperature threshold, the charging and discharging MOS of each battery pack may be controlled to be turned on, and the heating module is kept turned on, that is, all the battery packs are in a state of charging while heating. At this time, the external charging device provides a part of electric power for heating or cooling the thermal management module of the battery pack, and a part of electric power is used for charging the battery pack.

In still other possible embodiments, the control method further includes:

continuously acquiring second state information of each battery pack;

and in response to the fact that at least one battery pack does not meet the preset charging condition or the preset discharging condition, continuously controlling the thermal management module corresponding to each battery pack to perform temperature control.

Optionally, in this embodiment, the control host periodically obtains the state information of each battery pack, and when it is determined that at least one battery pack does not satisfy the preset charging condition or the preset discharging condition, the control host continuously performs temperature control on all battery packs in the battery system, and until each battery pack satisfies the preset charging condition or the preset discharging condition, the control host does not start charging or discharging each battery pack. Therefore, temperature control and charging and discharging of each battery pack in the battery system can be carried out synchronously, the problem of unbalanced charging and discharging electric quantity caused by unbalanced temperature of each battery pack is avoided, and the service life of the battery system and user experience are effectively prolonged.

In this embodiment, the preset discharging condition is similar to the preset charging condition, and the details of the disclosure are not repeated herein.

In other optional embodiments, after the controlling starts to charge or discharge each battery pack, the method further includes:

Wherein, the fact that each battery pack does not need to be subjected to temperature control can mean that the temperature of each battery pack in the battery system is within a certain preset temperature range. The preset temperature range may be calibrated in advance according to the inherent characteristics of the battery cell, for example, based on the anode and cathode materials of the battery pack and the type of the battery pack, which is not specifically limited in this disclosure.

In order to make those skilled in the art understand the technical solution provided by the present disclosure, taking the case of low-temperature charging as an example, fig. 2 is a flowchart illustrating a control method of a battery system according to an exemplary embodiment, where the method may be applied to the battery system, as shown in fig. 2, and the method includes:

s201, periodically acquiring the state information of each battery pack.

S202, judging whether the battery is in a charging state or not.

In the case where it is determined that the battery system is in the charged state, step S203 is executed.

S203, judging whether at least one battery pack exists and the heating module needs to be started.

In the case where it is determined that there is at least one battery pack that requires the heating module to be turned on, steps S204 to S207 are performed.

And S204, controlling all the battery packs to close the charging MOS.

And S205, controlling all the battery packs to start the heating module for heating.

And S206, periodically acquiring the state information of each battery pack.

And S207, judging whether the charging temperatures are all met.

In a case where it is determined that the charging temperature is satisfied, performing steps S208 to S209; in the case where it is determined that the charging temperature is not satisfied, steps S206 to S207 are performed.

And S208, controlling all battery packs to open the charging MOS.

And S209, judging whether the heating modules are all closed.

In the case where it is determined that each battery pack satisfies the condition for turning off the heating module, steps S210 to S211 are performed.

And S210, controlling all the battery packs to close the heating modules.

And S211, judging whether the charging is finished.

In the case where it is determined that the charging is completed, ending; in a case where it is determined that the charging is not completed, step S209 is performed.

In a possible embodiment, steps S201 and S206 may be repeatedly executed according to a certain period, and specifically, may be repeatedly executed if step S211 determines that the charging is not completed, and may be stopped if step S211 determines that the charging is completed. It is understood that after step S201 and step S206 are performed, the subsequent steps, such as S202 and S207, are performed accordingly in response to being performed.

Through above scheme, can accomplish the management to all battery packages automatically, reduce the user and use the threshold, hardware cost and cost of labor, can also avoid low temperature when charging, heating module opens and closes asynchronously, electric quantity between the battery package that arouses is unbalanced, correspondingly, charge at high temperature, the high temperature scene of discharging, the control of cooling module is similar with above-mentioned scheme, this disclosure is no longer repeated to this, and then, when having avoided high temperature charge-discharge, because cooling module opens and closes asynchronously, electric quantity between the battery package that arouses is unbalanced and "vat effect".

Based on the foregoing description, the control host may be a peripheral host, or may be any one of a plurality of battery packs.

Specifically, in the case where an additional peripheral host is provided in the battery system, the respective steps of the control method of the battery system described above may be performed by the peripheral host. In the present embodiment, the peripheral host refers to a device that functions only as an upper control host in the battery system and does not assume the role of charging and discharging the battery; in one embodiment, the peripheral host may be a controller or the like with a display screen.

In another possible embodiment, since each battery pack is provided with an independent BMS, the BMS may also perform the role of the control master. In the case that no additional peripheral host is provided in the battery system, each battery pack in the battery system may be subjected to election to determine that one battery pack is used as a host to perform each step of the battery pack charging method in each of the above embodiments. It is understood that, when the Battery pack is used as a host, the steps may be performed by a BMS (Battery Management System) or other electronic unit in the Battery pack.

Therefore, under the condition that no additional peripheral host is arranged in the battery system, the battery packs in the battery system are selected in an competitive mode, one most appropriate battery pack in the battery packs is used as the host, other battery packs are controlled when the battery system is charged, master-slave communication can be effectively and reliably achieved to cooperatively control the battery packs, the obtained host can be ensured to be the most appropriate host, and the performance of the battery system is improved.

In some optional embodiments, before the obtaining the first state information of each battery pack in the battery system, the method further includes, for a case that the control host is one battery pack of a plurality of battery packs in the battery system:

and if a first handshake response frame is not received by the first battery pack within a first preset time length for sending the first handshake request frame, using the first battery pack as a control host of the battery system, wherein the first handshake response frame is sent by other battery packs in response to the first handshake request frame, and the other battery packs are battery packs in the battery system except the first battery pack.

In the embodiments provided in the present disclosure, the power-on of each battery pack may be sequentially performed in a certain order, that is, the power-on order of each battery pack may be different. In a specific operation process, a user needs to manually turn on a power switch of each battery pack in sequence so that each battery pack automatically executes a power-on self-test program. After each battery pack is powered on and started, a handshake request frame can be sent to request to handshake with other battery packs, and then cooperative control is achieved. In some embodiments, the handshake request frame may carry a default address corresponding to a battery pack that sends the handshake request frame.

The first preset time period may be determined according to an actual communication line or a communication delay, and the like, and may be, for example, 0.05 second or 0.1 second, and the disclosure does not limit this. If the first handshake reply frame is not received within the first preset time length of the first handshake request frame, the first battery pack is determined that no other battery pack is powered on in the current battery system, that is, the first battery pack is the first battery pack powered on. Further, in some embodiments, the address of the first battery pack may be set to 1.

By adopting the scheme, the battery pack of the first power-on start-up can be accurately determined by responding to the power-on start-up to send the handshake request and according to whether the response information is received in the preset time length or not, and the battery pack of the first power-on start-up is taken as the control host, so that the handshake with the battery pack of the subsequent power-on start-up can be effectively ensured, and the robustness of cooperative control of each battery pack in the battery system is further ensured.

In some optional embodiments, the method further comprises:

The second preset time period may be longer than the first preset time period, for example, 1 minute, or 30 seconds, or 2 minutes, and the related staff may set according to specific needs thereof, which is not limited in this disclosure. In addition, the remaining capacity of each battery pack may be determined based on the SOC information in the state information.

For example, if the first battery pack does not receive a new second handshake request for 1 minute after receiving the second handshake request frame sent by 10 battery packs, it may be determined that only 10 battery packs exist as slave battery packs in the battery system, except for the first battery pack serving as the control master.

And according to the self residual capacity and the residual capacity of other slave machines, if the residual capacity of one slave machine is larger than the residual capacity of the first battery pack, the slave machine battery pack can be switched to the control master machine, and the first battery pack can be switched to the slave machine battery pack.

Alternatively, the first battery pack acquires the self state information of the first battery pack, and the state information of each slave may be the state information of each slave acquired in sequence, and specifically may be acquired in sequence according to the address of each slave.

By adopting the scheme, the control host acquires the electric quantity information of the control host and other slave machines, and switches the control host to the slave machine battery pack with the largest residual electric quantity according to the residual electric quantity represented by the electric quantity information, so that effective host rotation can be realized.

In some examples, if the first battery pack does not receive the second handshake request frame for keeping the second preset duration, then determining each slave according to all currently received second handshake request frames, including:

By adopting the scheme, the first battery pack is used as the control host to receive the handshake request frame sent by each newly electrified and started battery pack, the response is carried out, the slave machine added in the battery system is determined according to the handshake request frame, the electrification state of each battery pack in the battery system can be effectively determined, the effective handshake is carried out, and the robustness of the cooperative control of each battery pack in the battery system is ensured.

In some possible embodiments, after sending the first preset duration of the first handshake request frame, in response to receiving a second handshake request frame, the sending, by the first battery pack, a second handshake response frame to a second battery pack that sends the second handshake request frame includes:

and the first battery pack sends address configuration information to the second battery pack under the condition that the first battery pack determines that the second battery pack has no set address according to the second handshake request, wherein the address configuration information is used for address configuration of the second battery pack.

For example, if the second handshake request frame received by the first battery pack is the 8 th handshake request frame received after the first preset time period, the address of the second battery pack sending the second handshake request may be set to 9. And, in the subsequent charging control, an instruction may be sent to the second battery pack according to the address, so as to implement effective master-slave control.

In other optional embodiments, after the first battery pack determines a new master according to its own state information and the state information of each slave, the master may further determine the new master periodically according to its own state information and the state information of each slave. In addition, if the new master responds to the reception of the new handshake request frame, the battery pack which sends the handshake request frame may be used as the slave, the state information of the slave is acquired in the next determination period, and the new master is determined according to the state information, the state information of the master and the state information of other slaves.

In still other alternative embodiments, the host may start to operate formally after a preset time period after being determined as the host, and the host may determine that the battery pack sending the handshake request frame is restarted or newly added to the battery system in response to receiving a new handshake request frame.

To enable more reliable execution of coordinated control of a plurality of battery packs, the present disclosure further provides a flowchart as shown in fig. 3, fig. 3 is a flowchart illustrating a host election method according to an exemplary embodiment, which may be executed by a first battery pack in a battery system, which may be any one of the plurality of battery packs in the battery system, as shown in fig. 3, the method including:

s301, the first battery pack responds to power-on and startup and sends a first handshake request frame.

Wherein the first handshake request frame may include a default address of the first battery pack.

S302, the first battery pack judges whether a first handshake response frame is received.

In a case where it is determined that the first battery pack does not receive the first handshake reply frame, step S303 is performed.

Optionally, if the first battery pack receives the first handshake reply frame, it is determined that the first battery pack is a slave, and may reconfigure its local address according to the first handshake reply frame and wait to receive data or instructions sent by the host.

And S303, the first battery pack confirms that the first battery pack is the temporary host.

It is to be understood that the temporary host may also be referred to as an initial host, an original host, etc. for convenience of distinction only, and the temporary host plays the same role as the control host, which is not limited by the present disclosure.

And S304, the first battery pack determines the second battery pack as a slave and allocates an address in response to the second handshake request frame.

The second battery pack is a battery pack that sends the second handshake request, and the second battery pack may be any one of battery packs in a battery system. If the second handshake request indicates that the second battery pack has no set address, the first battery pack may send address configuration information to the second battery pack through a second handshake response frame, so that the second battery pack performs address configuration. Or, if the second handshake request indicates that the second battery pack has the default address, address configuration information may be generated according to the default address and sent to the second battery pack, so that the second battery pack performs address configuration again.

S305, the first battery pack judges whether no handshake request frame is received for one minute continuously.

In the case where it is determined that no handshake request frame is received for one minute continuously, steps S306 to S307 are performed.

Alternatively, in the case where it is determined that no handshake request frame is received for one minute in succession, the first battery pack may consider that the current system has the number of currently received slaves.

And S306, determining the residual electric quantity of all the slave machines and the self residual electric quantity by the first battery pack.

S307, the first battery pack judges whether the remaining power of the first battery pack is the highest.

In the case where it is determined that its own remaining power amount is the highest, step S308 is performed; in the case where it is determined that its own remaining capacity is not the highest, step S309 is performed.

And S308, determining the first battery pack as the host from the temporary host.

And S309, the first battery pack hands over the host to a third battery pack with the highest residual electric quantity.

After the control host is determined by the above scheme, the control host may obtain the status information of each battery pack according to a certain period, and determine whether the handover of the host is required according to the status information, and/or according to the steps of executing the control method of the battery system shown in fig. 1 and/or fig. 2.

Fig. 4 is a schematic diagram illustrating a control system according to an exemplary embodiment, the battery system may include a plurality of battery packs and the control system 40, as shown in fig. 4, the control system 40 includes:

an obtaining module 41, configured to obtain first state information of each battery pack in the battery system;

a determining module 42, configured to determine whether a battery pack requiring temperature control exists according to the first state information;

and the control module 43 is configured to, in response to determining that there is at least one battery pack that needs to be temperature-controlled, control the thermal management module corresponding to each battery pack to perform temperature control.

Optionally, the battery pack needing temperature control comprises a battery pack needing to be heated and a battery pack needing to be cooled; the control module 43 is specifically configured to:

if at least one battery pack needing to be heated is determined to exist, controlling a heating module corresponding to each battery pack to be started to heat each battery pack; and/or the presence of a gas in the atmosphere,

Optionally, the obtaining module 41 is specifically configured to:

Optionally, the control system 40 is further configured to:

continuously acquiring second state information of each battery pack;

and in response to each battery pack meeting a preset charging condition or a preset discharging condition, controlling each battery pack to start charging or discharging.

Optionally, the control system 40 is further configured to:

Optionally, the control system 40 is configured to:

Optionally, the control system 40 is further configured to:

Referring now to fig. 5, a schematic diagram of an electronic device (e.g., the terminal device or the server in fig. 1) 500 suitable for implementing embodiments of the present disclosure is shown. The terminal device in the embodiments of the present disclosure may include, but is not limited to, a mobile terminal such as a mobile phone, a notebook computer, a digital broadcast receiver, a PDA (personal digital assistant), a PAD (tablet computer), a PMP (portable multimedia player), a vehicle terminal (e.g., a car navigation terminal), and the like, and a stationary terminal such as a digital TV, a desktop computer, and the like. The electronic device shown in fig. 5 is only an example, and should not bring any limitation to the functions and the scope of use of the embodiments of the present disclosure.

As shown in fig. 5, electronic device 500 may include a processing means (e.g., central processing unit, graphics processor, etc.) 501 that may perform various appropriate actions and processes in accordance with a program stored in a Read Only Memory (ROM) 502 or a program loaded from a storage means 508 into a Random Access Memory (RAM) 503. In the RAM 503, various programs and data necessary for the operation of the electronic apparatus 500 are also stored. The processing device 501, the ROM 502, and the RAM 503 are connected to each other through a bus 504. An input/output (I/O) interface 505 is also connected to bus 504.

Generally, the following devices may be connected to the I/O interface 505: input devices 506 including, for example, a touch screen, touch pad, keyboard, mouse, camera, microphone, accelerometer, gyroscope, etc.; output devices 507 including, for example, a Liquid Crystal Display (LCD), speakers, vibrators, and the like; storage devices 508 including, for example, magnetic tape, hard disk, etc.; and a communication device 509. The communication means 509 may allow the electronic device 500 to communicate with other devices wirelessly or by wire to exchange data. While fig. 5 illustrates an electronic device 500 having various means, it is to be understood that not all illustrated means are required to be implemented or provided. More or fewer devices may alternatively be implemented or provided.

In particular, according to an embodiment of the present disclosure, the processes described above with reference to the flowcharts may be implemented as computer software programs. For example, embodiments of the present disclosure include a computer program product comprising a computer program carried on a non-transitory computer readable medium, the computer program containing program code for performing the method illustrated by the flow chart. In such an embodiment, the computer program may be downloaded and installed from a network via the communication means 509, or installed from the storage means 508, or installed from the ROM 502. The computer program performs the above-described functions defined in the methods of the embodiments of the present disclosure when executed by the processing device 501.

It should be noted that the computer readable medium in the present disclosure can be a computer readable signal medium or a computer readable storage medium or any combination of the two. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples of the computer readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the present disclosure, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. In contrast, in the present disclosure, a computer readable signal medium may comprise a propagated data signal with computer readable program code embodied therein, either in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to: electrical wires, optical cables, RF (radio frequency), etc., or any suitable combination of the foregoing.

In some embodiments, the clients, servers may communicate using any currently known or future developed network Protocol, such as HTTP (HyperText Transfer Protocol), and may interconnect with any form or medium of digital data communication (e.g., a communications network). Examples of communication networks include a local area network ("LAN"), a wide area network ("WAN"), the Internet (e.g., the Internet), and peer-to-peer networks (e.g., ad hoc peer-to-peer networks), as well as any currently known or future developed network.

The computer readable medium may be embodied in the electronic device; or may exist separately without being assembled into the electronic device.

The computer readable medium carries one or more programs which, when executed by the electronic device, cause the electronic device to perform the functions defined in the methods of the embodiments of the present disclosure.

Computer program code for carrying out operations for the present disclosure may be written in any combination of one or more programming languages, including but not limited to an object oriented programming language such as Java, smalltalk, C + +, and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).

In an exemplary embodiment, the present disclosure further provides a battery management system, which includes a storage module and a processing module, wherein the storage module stores a computer program, and the processing module implements all or part of the steps of the control method of the battery system provided in the above embodiment when executing the computer program.

In an exemplary embodiment, the present disclosure also provides a computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the above-mentioned method embodiments.

In an exemplary embodiment, the present disclosure also provides a computer program product comprising a computer program which, when executed by a processor, performs the steps in the above-described method embodiments.

The arrangement sequence of the embodiments of the present application is merely for description, and does not represent the advantages and disadvantages of the embodiments.

The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

The modules described in the embodiments of the present disclosure may be implemented by software or hardware. The name of the module does not in some cases constitute a limitation of the module itself, and for example, the acquisition module may also be described as a "module that acquires status information of each battery pack".

The functions described herein above may be performed, at least in part, by one or more hardware logic components. For example, without limitation, exemplary types of hardware logic components that may be used include: field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), application Specific Standard Products (ASSPs), system on a chip (SOCs), complex Programmable Logic Devices (CPLDs), and the like.

In the context of this disclosure, a machine-readable medium may be a tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. The machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

The foregoing description, for purpose of explanation, has been described with reference to specific embodiments. However, the illustrative discussions above are not intended to be exhaustive or to limit the disclosure to the precise forms disclosed. Many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the disclosure and its practical applications, to thereby enable others skilled in the art to best utilize the disclosure and various embodiments with various modifications as are suited to the particular use contemplated. The foregoing description, for purpose of explanation, has been described with reference to specific embodiments. However, the illustrative discussions above are not intended to be exhaustive or to limit the disclosure to the precise forms disclosed. Many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the disclosure and its practical applications, to thereby enable others skilled in the art to best utilize the disclosure and various embodiments with various modifications as are suited to the particular use contemplated.

Claims

1. A control method of a battery system, wherein the battery system comprises a control host and at least one battery pack connected with the control host, and the control method is applied to the control host and comprises the following steps:

acquiring first state information of each battery pack in a battery system;

and in response to the fact that at least one battery pack needing temperature control exists, controlling the thermal management module corresponding to each battery pack to carry out temperature control.

2. The method of claim 1, wherein the battery packs requiring temperature control comprise battery packs requiring heating and battery packs requiring cooling;

3. The method of claim 1, wherein obtaining the first status information of each battery pack in the battery system comprises:

4. The method according to any one of claims 1-3, further comprising:

continuously acquiring second state information of each battery pack;

5. The method of claim 4, wherein after the controlling starts charging or discharging each battery pack, further comprising:

6. The method according to any one of claims 1-3, wherein before obtaining the first status information of each battery pack in the battery system, the method further comprises:

7. The method of claim 6, further comprising:

8. The method of claim 7, wherein if the first battery pack does not receive the second handshake request frame for a second preset duration, determining each slave according to all currently received second handshake request frames, including:

9. A battery system comprising a plurality of battery packs and a control system, the control system comprising:

10. A battery management system comprising a storage module and a processing module, the storage module storing a computer program, wherein the processing module implements the control method of any one of claims 1 to 8 when executing the computer program.