CN116365631A - Battery management system and battery pack - Google Patents

Battery management system and battery pack Download PDF

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Publication number
CN116365631A
CN116365631A CN202211560215.XA CN202211560215A CN116365631A CN 116365631 A CN116365631 A CN 116365631A CN 202211560215 A CN202211560215 A CN 202211560215A CN 116365631 A CN116365631 A CN 116365631A
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CN
China
Prior art keywords
battery
module
battery management
data
battery pack
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Pending
Application number
CN202211560215.XA
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Chinese (zh)
Inventor
鲁志健
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Nanjing Chervon Industry Co Ltd
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Nanjing Chervon Industry Co Ltd
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Publication of CN116365631A publication Critical patent/CN116365631A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
    • H02J7/00036—Charger exchanging data with battery
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
    • H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
    • H02J7/007194—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature of the battery
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4278—Systems for data transfer from batteries, e.g. transfer of battery parameters to a controller, data transferred between battery controller and main controller
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

The application discloses battery management system and battery package, this system includes: at least one battery pack and a battery management module; the battery pack comprises a plurality of groups of battery core groups; the power port is used for outputting the power of the battery cell group; the data acquisition module is connected with one or more battery cell groups and is used for acquiring state data of the connected battery cell groups; the data transmission module is connected with the data acquisition module and outputs state data of the battery cell group in a wireless communication mode; the battery management module is in wireless communication with the data transmission module to acquire the state data of the battery cell group and manage the use state of the battery pack according to the state data; the battery management module is provided inside the battery pack or inside the electric tool or inside the external terminal device. With the present application, a battery pack management system capable of wireless communication transmitting battery pack data and managing battery packs is provided.

Description

Battery management system and battery pack
Technical Field
The application relates to the technical field of energy storage, in particular to a battery management system and a battery pack.
Background
The power battery pack is used as an electric energy storage device and can provide power supply electric energy for different direct-current electric tools. Each battery pack is provided with a Battery Management System (BMS), the BMS is used as a control system for controlling the use safety of the battery pack, the use state of the battery can be monitored at any time, and the use safety of the battery pack can be ensured through some necessary control measures.
However, the battery cell group of the battery pack needs to be connected to the BMS module through a cable, so as to output state parameters of the battery cells in the battery pack, such as current, voltage, temperature, etc. Therefore, the more the battery core groups in the battery pack, the more cables are, so that the wiring in the whole battery pack is complex, faults which affect the reliability are easy to occur between the wire harness and the connector, and the maintenance cost is increased. In addition, in order to increase the reliability of the wire harness, a thicker cable is generally used, and the battery pack is increased in volume and the cruising ability of the battery pack is also affected.
Disclosure of Invention
In order to solve the deficiencies of the prior art, an object of the present application is to provide a battery pack management system capable of performing wireless communication to transmit battery pack data and manage battery packs.
In order to achieve the above object, the present application adopts the following technical scheme:
a battery management system for a power tool, comprising: at least one battery pack; the battery pack comprises at least one group of electric core groups; a power port to output electrical energy to power the power tool; the data acquisition module is connected with one or more battery cell groups and is used for acquiring state data of the connected battery cell groups; the data transmission module is used for outputting the state data of the battery cell group in a wireless communication mode; the battery management system further includes: the battery management module is used for acquiring the state data of the battery cell group and managing the use state of the battery pack according to the state data; the battery management module is disposed inside the battery pack or inside the electric tool or in an external terminal device.
In one embodiment, the battery pack does not include a communication port.
In one embodiment, the battery pack includes a plurality of data acquisition modules that communicate acquired state data of the battery cell groups with each other based on the first channel.
In one embodiment, the battery management module of one battery pack can acquire the status data transmitted by the data transmission module of another battery pack based on the second channel.
In one embodiment, the data transmission modules within each battery pack are within the same area network.
In one embodiment, the data transmission module includes one or more of a radio frequency unit, a bluetooth unit, an infrared unit.
In one embodiment, the data acquisition module and the data transmission module are integrated on one processing chip; and the processing chip outputs the state data of the battery cell group through a cable of the power port.
In one embodiment, the status data carries identification information of the battery cell group.
In one embodiment, the data transmission module is configured to output verification information to the battery management module.
In one embodiment, the battery management module is configured to: acquiring state data of the battery cell group at a preset frequency; detecting whether the state data contains identification information of all the battery cell groups or not; if the first identification information is not detected within the preset time, a control signal is output to disconnect the first battery module corresponding to the first identification information from the electric power port.
In one embodiment, the battery management module is configured to: if abnormal state data are detected, determining second identification information of the battery module corresponding to the abnormal state data; and outputting a control signal to disconnect the second battery module corresponding to the second identification information from the connection port.
In one embodiment, the battery management system further includes: the data storage module is used for storing the abnormal state data of the battery cell group or the second identification information.
In one embodiment, the battery management module enters a low power consumption mode when the state data of the battery cell group is not detected within a preset time.
In one embodiment, the battery management module obtains the status data acquired by the data acquisition module in a wireless communication manner.
In one embodiment, the data transmission duration of each output of the status data by the data transmission module is less than or equal to 500ms.
In one embodiment, the quiescent current of the battery management module is less than or equal to 100uA, the quiescent current comprising a standby current of the battery management module in a standby state or an average operating current of the battery management module at a frequency below 5 Hz.
In one embodiment, the battery management module can draw power from either cell module or from the battery pack or from a separate power module, including a coin cell battery.
A battery pack suitable for use with a power tool, comprising: a housing; the battery cell group is accommodated in the shell and is used for supplying power to the electric tool; the power port is used for outputting the power of the battery cell group; the data acquisition module is connected with one or more battery cell groups and is used for acquiring state data of the connected battery cell groups; the data transmission module is used for outputting the state data of the battery cell group in a wireless communication mode; the battery management module is used for acquiring the state data of the battery cell group and managing the use state of the battery pack according to the state data; the battery management module is arranged in the shell; the data transmission module can output the state data to the electric tool in a wireless communication mode.
In one embodiment, the data transmission module of the battery pack is in wireless communication with the data transmission module of another battery pack.
In one embodiment, the data transmission module of the battery pack communicates wirelessly with an external terminal.
The beneficial point of the application lies in: the state data output of the battery cell group in the battery pack can be monitored without the help of the cable, the complexity of wiring in the battery pack is reduced, the later maintenance is convenient, and meanwhile, the power consumption in the battery pack is reduced due to the reduction of the cable, so that the cruising ability of the battery pack is improved.
Drawings
FIG. 1 is a schematic diagram of a battery management system in one embodiment of the present application;
FIG. 2 is a schematic diagram of a battery management system in another embodiment of the present application;
fig. 3 is a schematic view of a structure of a battery pack in one embodiment;
fig. 4 is a schematic view of the structure of a battery pack in one embodiment.
Detailed Description
The present application is described in detail below with reference to the attached drawings and specific embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the application and not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present application are shown in the drawings.
Moreover, certain sub-components of a single component, as well as other aspects of the system, may not be described in detail herein for the sake of brevity. It should be noted that in an actual system, such as a battery management system, there may be many alternative or additional functional relationships or physical couplings. Such functional blocks may be implemented by any number of suitable components configured to perform the specified functions.
The present disclosure generally improves the manner in which a battery pack communicates with a battery management system or with a power tool or with a charger, etc. In the present application, the battery pack may include only the power ports, i.e., the positive output port and the negative output port, without having a communication port. Without a communication port, the cable between the cell group inside the battery pack and the communication port would also be absent, which reduces the wiring complexity inside the battery pack to some extent. However, the battery pack without the communication port still needs to perform data communication with external devices such as the BMS or the electric tool or the charger, so the present disclosure will provide various communication methods to satisfy the functions of data monitoring and management of the battery pack. It should be noted that the battery pack in the present application may be used for a power tool, an electric automobile, or other devices capable of using direct current power.
In a first embodiment of the present application, a battery management system 100a is shown in fig. 1, and includes a battery pack 100 and a battery management module 200, wherein the battery pack 100 includes a plurality of battery cell groups 101, a power port 102, a data acquisition module 103, and a data transmission module 104, wherein the power port 102 includes a positive output port 1021 and a negative output port 1022. The battery management module 200 may be a BMS module provided in the battery pack 100 or a BMS module provided in other battery packs or a control module provided in the power tool or a control module provided in the charger or an intelligent terminal of a user integrated with a battery management function. The type and location of the battery management module 200 is not limited in this application. In the battery management system 100a shown in fig. 1, the battery management module 200 is configured to acquire status data of the battery pack 100 in a wireless communication manner and control the use state of the battery pack 100 accordingly. For example, status data such as output voltage, current, and temperature of the battery cell groups 101 in the battery pack 100 are acquired, and charge/discharge of the battery pack 100 or charge/discharge of any battery cell group 101 in the battery pack 100 is controlled according to the monitored data.
For example, the battery cell group 101 in the present application may be composed of a plurality of battery cells 1011, and each battery cell 1011 is a unit cell of minimum size. A plurality of cells 1011 are electrically connected in series and/or parallel to form a cell stack 101.
The data acquisition module 103 in the present application may be a voltage sensor, a current sensor, a temperature sensor, or other electrical components capable of acquiring data related to the battery cell group 101. The data transmission module 104 may be integrated with the data acquisition module 103 or may be configured to be independently powered to support wireless communications. In one embodiment, the data transmission module 104 may be two separate modules from the data acquisition module 103. In one embodiment, the data transmission module 104 may be an integrated unit with the data acquisition module 103, where the unit has data acquisition and wireless transmission functions.
For example, the data transmission module 104 may support one or more of a plurality of wireless communication modes such as bluetooth communication, radio frequency communication, LTE communication (Long Term Evolution), zigBee communication, and the like. It will be appreciated that the data transmission module 104 and the battery management module 200 have data transmitters and receivers, respectively, that communicate wirelessly. For example, the data transmission module 104 has a transmitting antenna, then the battery management module 200 has a receiving antenna, the data transmission module 104 has a receiving antenna, and then the battery management module 200 has a transmitting antenna. In one embodiment, the battery management system 100a may also include a distribution network unit. The network allocation unit can select the optimal wireless communication mode as the currently adopted communication mode according to all supportable wireless communication modes detected by the data transmission module 104. For example, the data transmission module 104 supports bluetooth and wifi simultaneously, and when the network allocation unit detects that the bluetooth signal is stronger, the data transmission module 104 can be triggered to perform data interaction by adopting a bluetooth communication mode.
In one implementation, one or more data acquisition modules 103 may be included in the battery pack 100. One data acquisition module 103 may acquire status data for one or more of the cell groups 101. It can be understood that any one of the battery cell groups 101 corresponds to unique identification information, and the identification information may be information capable of uniquely determining the identity of the battery cell group 101, such as the number ID or the position information of the battery cell group 101. Therefore, when the data acquisition module 103 acquires the state data of the battery cell group 101, the identification information of the battery cell group 101 is correspondingly acquired. It will be appreciated that all of the cells 1011 within the cell group 101 also have unique cell identifications. For example, the identification information of the cell group 101 may include the cell identifications of all the cells 1011 that make up the cell group.
In one implementation, any one of the data acquisition modules 103 within the battery pack 100 may communicate wirelessly with the other one or more data acquisition modules 103. Alternatively, the data acquisition module 103 may transmit different communication data based on different channels or communicate with different objects based on different channels. For example, different data acquisition modules 103 within one battery pack 100 may communicate based on a first channel. In one implementation, the data transmission module 104 between different battery packs may communicate using a second channel. The communication frequencies of the first channel and the second channel are different. It will be appreciated that the data transmission modules in different tools or battery packs may constitute a wireless local area network in which data interaction takes place. The specific networking manner is not limited herein.
In one implementation, the data transmission module 104 may output verification information while transmitting the status data, and when the data acquisition module inside the battery pack 100 or outside the battery pack 100 receives the status data, the data acquisition module may acquire the verification information and receive the status data after verification is passed. The accuracy of the state data transmission of the battery pack is ensured. Optionally, the data transmission module 104 may send the verification information to a user terminal, such as a smart phone, and the battery management module 200 may receive the status data after the user confirms and inputs the verification code information on a battery pack or an electric tool in which the battery management module 200 is located. Alternatively, the check information may be a check code. The data transmission module 104 may also transmit the verification information before transmitting the status data.
In one embodiment, the duration of one transmission of the status data of the battery pack 100 by the data transmission module 104 is less than or equal to 500ms, so that the probability of increasing noise in the transmitted data can be reduced.
In one embodiment, the battery management module 200 has a quiescent current, which is a standby current when the battery management module 200 is in a standby state, or an average operating current when the battery management module 200 acquires data at a frequency lower than 5 Hz.
In one embodiment, the battery management module 200 may have a plurality of modes of operation. For example, the battery management module 200 may include a low power mode, a sleep mode, a deep sleep mode, and a shutdown mode. The working currents corresponding to the four working modes are sequentially reduced, for example, the working current of the battery management module 200 is basically A1 in the low power consumption mode, the working current is basically A2 in the sleep mode, the current is basically A3 in the deep sleep mode, and the working current is zero in the shutdown mode, wherein A1> A2 > A3>0.
In one embodiment, the battery management module 200 may control one or more of the battery cells 101 to power up or power down. For example, if the BMS module detects that the state data stored in a certain cell group 101 is abnormal (for example, the temperature is higher than the preset temperature), the electrical connection between the cell group 101 and the power port 102 is disconnected, and the cell group 101 is not used to supply power or the cell group 101 is not charged.
In one implementation, the battery management module 200 may obtain the state data of the battery cell group at a preset frequency or a preset period, for example, every 1 s. It can be appreciated that, when the battery management module 200 obtains the state data of the battery cell group 101, the identification information of the battery cell group 101 is also known at the same time. That is, if all the battery cell groups 101 work normally, the battery management module 200 can obtain the status data of all the battery cell groups 101 and the identification information of all the corresponding battery cell groups 101 at every preset frequency. Thus, the battery management module 200 may determine whether all the battery cells 101 are operating properly or determine that the wireless communication links of all the battery cells 101 are operating properly by comparing whether the identification information of all the battery cells 101 are detected each time. It can be appreciated that, if the battery management module 200 does not detect the first identification information within the preset time, it can be considered that the wireless communication link of the first battery cell group corresponding to the first identification information is interrupted or the first battery cell group does not work normally, and the state data thereof cannot be output effectively. Thus, the battery management module 200 will output a control signal to disconnect the first cell group corresponding to the first identification information from the power port 102. That is, when any of the battery cell groups is out of operation or the communication link is broken, the battery management module 200 may reject the battery cell group from the charging circuit or the discharging circuit of the battery pack 100.
It can be appreciated that even if the battery management module 200 detects the identification information of all the battery cell groups 101, it cannot be ensured that the state data of all the battery cell groups 101 are normal. In one implementation, the battery management module 200 may compare the state data of the battery cell group 101 received each time with a preset data threshold to determine whether there is an abnormality in the received state data. For example, after receiving the temperature data of the battery cell group 101, comparing the temperature data with a preset temperature threshold value, and determining that the temperature data is abnormal state data when the temperature data is higher than the preset temperature threshold value. And further, according to the corresponding relation between the state data and the identification information, determining second identification information corresponding to the abnormal state data. Further, the battery management module 200 may output a control signal to disconnect the second battery module corresponding to the second identification information from the power port 102. That is, when the state data of any one of the battery cell groups 101 is abnormal, the battery management module 200 may reject the battery cell group 101 from the charging circuit or the discharging circuit of the battery pack 100.
In one implementation, if the battery management module 200 does not detect any state data of the battery cell group 101 within a preset time, it may be confirmed that the battery pack has stopped the charge and discharge operation, so that the battery management module 200 automatically enters the low power consumption mode. Later, when the battery pack 100 is started up again, the battery management module 200 may be awakened from the low power consumption mode according to a switching operation of the user for the tool side or a switching operation for the battery pack 100.
It can be appreciated that the battery management module 200 can monitor the state data of the battery pack 100 in a more timely manner by means of wireless communication, so as to ensure timeliness of the control response of the working state of the battery pack 100.
In one embodiment, the battery management module 200 may draw power from the battery pack 100, or from any of the battery cell groups 101 within the battery pack 100, or based on a separate power module. The independent power supply module can be a button battery or other small-sized direct current power supply devices. Alternatively, the battery management module 200 may obtain the power supply from the battery pack 100 where the data transmission module 104 is located based on a wireless charging manner while performing data interaction with the data transmission module 104. Alternatively, the battery management module 200 may also acquire the power supply power from the battery pack or the power tool side in an electromagnetic charging manner. Alternatively, the battery management system 100a may further include a separate power generation unit, which is provided on the battery pack or the electric tool or the charger, and is capable of generating power in a vibration or pressing or sound manner. It is understood that the independent power generation unit may be provided within the battery management module 200 or around the battery management module so as to supply the generated power to the battery management module 200. Optionally, the battery management module 200 may further include an electrical energy storage unit, which can store electrical energy generated by wireless charging, electromagnetic charging, or vibration power generation, press power generation, or the like, to power the battery management module 200.
In one implementation, battery management system 100a also includes a data storage module (not shown). The data storage module can store the state data of all the cell groups, and can also only store abnormal state data and/or second identification information. During subsequent maintenance, the abnormal cell group can be positioned or the reason for the abnormality of the cell group can be acquired only by searching the abnormal state data or the second identification information from the data storage module, so that the subsequent maintenance is facilitated.
In one implementation, the data storage module may be disposed within the battery pack 100 or within the power tool or charger.
Fig. 2 shows a battery management system 300a according to another embodiment of the present application, including a battery pack 300 and a battery management module 400, wherein the battery pack 300 includes a plurality of battery cell groups 301, a power port 302, and a carrier communication unit 303, wherein the power port 302 includes a positive output port 3021 and a negative output port 3022. The present embodiment is different from the previous embodiment in that: the data acquisition module and the data transmission module are not included, but the carrier communication unit 303 is included. The carrier communication unit 303 can collect status data of each of the battery cell groups and transmit the status data to the battery management module 400.
The battery management module 400 may be a BMS module provided in the battery pack 300 or a BMS module provided in another battery pack or a control module provided in the power tool or a control module provided in the charger or an intelligent terminal of a user having integrated a battery management function. The present embodiment is also not limited to the type and location of the battery management module 400. In the battery management system shown in fig. 2, the battery management module 400 is configured to acquire status data of the battery pack 300 in a carrier communication manner and control the usage status of the battery pack 300 accordingly. For example, status data such as output voltage, current, and temperature of the battery cell groups 301 in the battery pack 300 are acquired, and charge/discharge of the battery pack 300 or charge/discharge of any battery cell group 301 in the battery pack 300 is controlled according to the monitored data.
In this embodiment, as shown in fig. 2, the carrier communication unit 303 is integrated on each of the battery cells 3011, and status data of all the battery cells 3011 may be collected instead of collecting data of a group of battery cells 301. Specifically, after the carrier communication unit 303 collects the state data of the battery cell 3011, the state data is registered on a continuous high-frequency carrier and output to the battery management module 400. Likewise, the battery pack 300 does not require a communication port nor a communication cable for connecting the battery cells or the battery cell group to the communication port. The effect of reducing the complexity of wiring in the battery pack 300 is also achieved.
It can be understood that, since the carrier communication unit 303 can collect the status data of each of the battery cells 3011, the battery management module 400 can calculate the status information of the battery pack 300, such as SOC, SOP, SOH, according to the status data of all the battery cells 3011, and can ensure the accuracy of the calculated status information of the battery pack due to sufficient raw data.
In this embodiment, except for the difference between the carrier communication manner and the wireless communication manner in the above embodiment, other functions are the same as those described in the above embodiment, and will not be repeated here.
It will be appreciated that the output of data in the battery pack, whether wireless or carrier communication, is essentially accomplished without the aid of a communication cable. The purpose is to reduce wiring in a battery pack. Therefore, other ways of implementing the data output of the battery pack without using a communication cable are also within the scope of the present application.
In one embodiment, as shown in fig. 3, a battery pack 500 includes a housing 501, a battery cell stack 502, a battery cell 503, a power port 504, a data acquisition module 505, a data transmission module 506, and a battery management module 507. The housing 501 may be a removable seal cartridge that may have openings for the positive output port 5041 and the negative output port 5042. A plurality of cells 503 may be grouped in series and/or parallel to form a cell stack 502. The data acquisition module 505 may be various sensing devices such as temperature sensors, voltage sensors, current sensors. The data transmission module 506 may be integrated with the data acquisition module 505 to output the state data of the battery cells or the battery cell groups in a wireless communication manner. The battery management module 507 is a BMS management module, and may be located inside the battery pack 500, or may be located in a power tool powered by the battery pack 500 or in a charger. It is understood that the BMS module is integrated with a controller, a processor, a memory, and a transceiver, as can various components.
The battery pack 500 protected by the present embodiment can be applied to the battery management system of the above-described embodiment.
In one embodiment, as shown in fig. 4, a battery pack 600 includes a housing 601, a battery cell group 602, a battery cell 603, a power port 604, a carrier communication unit 605, and a battery management module 606, wherein the power port 604 includes a positive output port 6041 and a negative output port 6042. Unlike the battery pack 300 shown in fig. 2, the carrier communication unit 605 in the battery pack 600 is a carrier chip integrated on each of the battery cells 603, and can output status data of the battery cells in a carrier communication manner.
Note that the above is only a preferred embodiment of the present application and the technical principle applied. Those skilled in the art will appreciate that the present application is not limited to the particular embodiments described herein, but is capable of numerous obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the present application. Therefore, while the present application has been described in connection with the above embodiments, the present application is not limited to the above embodiments, but may include many other equivalent embodiments without departing from the spirit of the present application, the scope of which is defined by the scope of the appended claims.

Claims (20)

1. A battery management system for a power tool, comprising:
at least one battery pack;
the battery pack includes:
at least one set of battery cells;
a power port to output electrical energy to power the power tool;
the data acquisition module is connected with one or more battery cell groups and is used for acquiring state data of the connected battery cell groups;
the data transmission module is used for outputting the state data of the battery cell group in a wireless communication mode;
the battery management system further includes:
the battery management module is used for acquiring the state data of the battery cell group and managing the use state of the battery pack according to the state data;
the battery management module is disposed inside the battery pack or inside the electric tool or in an external terminal device.
2. The battery management system of claim 1, wherein,
the battery pack does not include a communication port.
3. The battery management system of claim 1, wherein,
the battery pack comprises a plurality of data acquisition modules, and the plurality of data acquisition modules transmit the acquired state data of the battery cell group based on the first channel.
4. The battery management system of claim 1, wherein,
the battery management module of one battery pack can acquire the state data transmitted by the data transmission module of the other battery pack based on the second channel.
5. The battery management system of claim 4, wherein,
the data transmission modules in the battery packs are positioned in the same area network.
6. The battery management system of claim 1, wherein,
the data transmission module comprises one or more of a radio frequency unit, a Bluetooth unit and an infrared unit.
7. The battery management system of claim 1, wherein,
the data acquisition module and the data transmission module are integrated on a processing chip;
and the processing chip outputs the state data of the battery cell group through a cable of the power port.
8. The battery management system of claim 1, wherein,
and the state data carries the identification information of the battery cell group.
9. The battery management system of claim 1, wherein,
the data transmission module is further configured to output verification information to the battery management module.
10. The battery management system of claim 8, wherein,
the battery management module is configured to:
acquiring state data of the battery cell group at a preset frequency;
detecting whether the state data contains identification information of all the battery cell groups or not;
if the first identification information is not detected within the preset time, a control signal is output to disconnect the first battery module corresponding to the first identification information from the electric power port.
11. The battery management system of claim 10, wherein,
the battery management module is configured to:
if abnormal state data are detected, determining second identification information of the battery cell group corresponding to the abnormal state data;
and outputting a control signal to disconnect the second battery module corresponding to the second identification information from the connection port.
12. The battery management system of claim 11, wherein,
further comprises:
the data storage module is used for storing the abnormal state data of the battery cell group or the second identification information.
13. The battery management system of claim 10, wherein,
and when the battery management module does not detect the state data of the battery cell group within the preset time, entering a low power consumption mode.
14. The battery management system of claim 1, wherein,
the battery management module acquires the state data acquired by the data acquisition module in a wireless communication mode.
15. The battery management system of claim 1, wherein,
and the data transmission duration of the data transmission module for outputting the state data every time is less than or equal to 500ms.
16. The battery management system of claim 1, wherein,
the static current of the battery management module is less than or equal to 100uA, and the static current comprises standby current of the battery management module in a standby state or average working current of the battery management module for acquiring the state data at a frequency lower than 5 Hz.
17. The battery management system of claim 1, wherein,
the battery management module can obtain power from any one of the battery cell groups, or from the battery pack, or from a separate power supply module comprising a button battery.
18. A battery pack suitable for use with a power tool, comprising:
a housing;
the battery cell group is accommodated in the shell and is used for supplying power to the electric tool;
the power port is used for outputting the power of the battery cell group;
the data acquisition module is connected with one or more battery cell groups and is used for acquiring state data of the connected battery cell groups;
the data transmission module is used for outputting the state data of the battery cell group in a wireless communication mode;
the battery management module is used for acquiring the state data of the battery cell group and managing the use state of the battery pack according to the state data;
the battery management module is arranged in the shell;
the data transmission module can output the state data to the electric tool in a wireless communication mode.
19. The battery pack of claim 18, wherein the battery pack comprises a plurality of battery cells,
the data transmission module of the battery pack is in wireless communication with the data transmission module of another battery pack.
20. The battery pack of claim 19, wherein the battery pack comprises a plurality of battery cells,
and the data transmission module of the battery pack is in wireless communication with an external terminal.
CN202211560215.XA 2021-12-27 2022-12-07 Battery management system and battery pack Pending CN116365631A (en)

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Publication number Priority date Publication date Assignee Title
CN205564907U (en) * 2016-03-30 2016-09-07 比亚迪股份有限公司 Battery module, battery package and vehicle
CN206441830U (en) * 2016-10-25 2017-08-25 宁德时代新能源科技股份有限公司 The cell managing device and system of battery bag
CN110896233B (en) * 2018-09-12 2021-07-30 宁德时代新能源科技股份有限公司 Battery management system
CN109888145A (en) * 2019-04-01 2019-06-14 北斗航天汽车（北京）有限公司 Battery modules and battery pack with wireless communication function
CN112327184A (en) * 2020-10-14 2021-02-05 江苏纵帆微电子有限公司 Battery pack data transmission system and transmission method thereof

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