CN215418432U - Power battery system and electric vehicle - Google Patents
Power battery system and electric vehicle Download PDFInfo
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- CN215418432U CN215418432U CN202121129553.9U CN202121129553U CN215418432U CN 215418432 U CN215418432 U CN 215418432U CN 202121129553 U CN202121129553 U CN 202121129553U CN 215418432 U CN215418432 U CN 215418432U
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Abstract
The utility model relates to the field of batteries, and provides a power battery system and an electric vehicle, wherein the power battery system comprises: the battery management system comprises a shell (10), a power management system (100) and a first battery management system (200), wherein a first interface (11) and a second interface (12) are arranged outside the shell (10); a power management system (100) which establishes a communication connection with the first battery management system (200) through a CAN bus and an ID line via a first interface (11) inside the housing (10); the first battery management system (200) is arranged outside the shell (10), the first battery management system (200) is determined to be connected into the power supply management system (100) through detecting a level signal of an ID line, a CAN bus responds to a first battery control command of the power supply management system (100), and electric power connection is established between the second interface (12) and a power supply output end, so that a user CAN conveniently and dynamically expand the battery capacity of the power battery system according to the requirement of the endurance mileage of the user.
Description
Technical Field
The utility model relates to the field of batteries, in particular to a power battery system and an electric vehicle.
Background
As is well known, a power battery system is widely applied to electric vehicles such as electric bicycles, power-assisted bicycles, electric automobiles, and the like, wherein the capacity of the power battery is the core of the power battery system, and manufacturers can increase the endurance mileage of the electric vehicles by expanding the capacity of the power battery. At present, the method for expanding the capacity of the power battery by manufacturers is mainly to perform internal expansion on the whole power battery system, namely the capacity of the power battery is expanded before the power battery system leaves a factory. It is not possible to dynamically expand the battery capacity of a power battery system if the user wants to meet his or her mileage requirement. Therefore, how to dynamically expand the battery capacity of the power battery system according to the requirement of the endurance mileage of the user is a problem which needs to be solved urgently at present.
SUMMERY OF THE UTILITY MODEL
The utility model provides a power battery system, which can realize that a user dynamically expands the battery capacity of the power battery system according to the requirement of the endurance mileage of the user.
In a first aspect, a power battery system is provided, comprising: the battery management system comprises a shell, a power management system and a first battery management system, wherein a first interface and a second interface are arranged outside the shell; the power management system is positioned in the shell, is in communication connection with the first battery management system through a CAN bus and an ID line passing through the first interface, and is used for managing access of the first battery management system and charging and discharging of the first battery management system; the first battery management system is located outside the shell and used for determining that the first battery management system is connected to the power supply management system through detecting a level signal of an ID line, responding to a first battery control instruction of the power supply management system through a CAN bus and establishing electric power connection with a power supply output end through a second interface.
The utility model provides a power battery system which facilitates a user to expand the battery capacity of the power battery system by providing a first interface and a second interface on an external housing of a power management system. For example, when the power battery system leaves a factory, a first interface and a second interface are arranged outside a shell where the power management system is located, a user CAN access the first battery management system into the power management system through a CAN bus and an ID (identification) line passing through the first interface according to the mileage requirement of the user, so that the power management system manages the state parameters and charging and discharging of the first battery management system through the CAN bus, and when the electric quantity of the first battery management system is low, the user CAN replace the first battery management system with the battery management system with larger battery capacity, so that the mileage requirement of the user is met. Therefore, the power battery system provided by the utility model manages the accessed battery management system in a mode of arranging the external interface and the CAN bus, and CAN facilitate a user to dynamically expand the battery capacity of the power battery system according to the requirement of the endurance mileage of the user.
Optionally, the power management system includes a CAN module and a power management module, and the CAN module establishes a communication connection with the first battery management system through a CAN bus, and is configured to acquire a state parameter of the first battery management system and send the first battery control instruction to the first battery management system; and the power management module is connected with the CAN module and used for generating the first battery control instruction according to the state parameter of the first battery management system and sending the first battery control instruction to the CAN module.
Optionally, the first battery management system includes a first CAN module, a first battery pack management module and a first detection module, and the first CAN module establishes a communication connection with the CAN module through a CAN bus and is configured to send the state parameters of the first battery pack, which are acquired by the first battery pack management module, to the CAN module through the CAN bus; the first battery pack management module is connected with the first CAN module and used for managing the state parameters of a first battery pack and receiving the first battery control instruction sent by the first CAN module; the first detection module is connected with the grounding end of the power management module through an ID line and used for determining whether the first battery management system is connected to the power management system or not through detecting a level signal of the ID line.
Optionally, the power battery system further comprises: the second battery management system is located outside the shell, is in communication connection with the power management system through a CAN bus passing through the third interface and an ID line, and is used for determining the access of the second battery management system to the power management system through detecting a level signal of the ID line, responding to a second battery control command of the power management system through the CAN bus, and establishing power connection with the power output end through the fourth interface.
The power battery system is convenient for a user to expand the battery capacity of the power battery system by arranging the third interface and the fourth interface on the outer shell of the power management system. For example, when the power battery system leaves a factory, a third interface and a fourth interface are further arranged on an external shell of the power management system, wherein the first battery management system is connected to the power management system through the first interface and the second interface, and a user CAN connect the second battery management system to the power management system through a CAN bus and an ID (identity) line through the third interface according to the requirement of the user on the cruising mileage so that the power management system CAN manage the state parameters and charging and discharging of the second battery management system; in addition, the user can establish electric power connection between the second battery management system and the power output end through the fourth interface, and the second battery management system and the first battery management system provide power output to the outside together, so that the user completes the expansion of the battery capacity of the power battery system. Therefore, the power battery system provided by the utility model CAN be used for managing the accessed multiple battery management systems in a CAN bus mode by arranging the multiple external interfaces, so that a user CAN conveniently and dynamically expand the battery capacity of the power battery system according to the requirement of the endurance mileage of the user.
Optionally, the power management system includes a CAN module and a power management module, and the CAN module establishes a communication connection with the second battery management system through a CAN bus, and is configured to acquire a state parameter of the second battery management system and send the second battery control instruction to the second battery management system; and the power management module is connected with the CAN module and used for generating the second battery control instruction according to the state parameter of the second battery management system and sending the second battery control instruction to the CAN module.
Optionally, the second battery management system includes a second CAN module, a second battery pack management module, and a second detection module, where the second CAN module establishes a communication connection with the CAN module through a CAN bus, and is configured to send the state parameters of the second battery pack, which are acquired by the second battery pack management module, to the CAN module through the CAN bus; the second battery pack management module is connected with the second CAN module and used for managing the state parameters of a second battery pack and receiving the second battery control instruction sent by the second CAN module; and the second detection module is connected with the grounding end of the power management module through an ID line and used for determining whether the second battery management system is accessed to the power management system or not by detecting a level signal of the ID line.
Optionally, the first battery management system and the second battery management system are the same type of battery management system. The battery management systems of the same type are used for expanding the battery capacity of the power battery system, so that the condition that the expansion of the battery capacity fails due to different voltages of each battery management system in parallel connection can be avoided.
Optionally, the third interface and the fourth interface are an interface having a PLC function and a CAN function.
The communication interface (the third interface) and the power interface (the fourth interface) are combined into one interface, so that the possibility of inserting wrong interfaces by a user can be reduced, and the user experience is improved.
Optionally, the first interface and the second interface are an interface having a PLC function and a CAN function.
The communication interface (the first interface) and the power interface (the second interface) are combined into one interface, so that the possibility of inserting wrong interfaces by a user can be reduced, and the user experience is improved.
In a second aspect, an electric vehicle is provided, comprising the power battery system of any one of the first aspect.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a schematic diagram of a battery capacity expansion structure of a power battery system according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a power battery system in an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of another power battery system in accordance with an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of another power battery system in accordance with an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of another power battery system in accordance with an embodiment of the present invention;
fig. 6 is a schematic diagram of a work flow of the PMS and the BMS communicating in a fixed address manner according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a work flow of the PMS and the BMS communicating in a dynamic address allocation manner according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of an electric vehicle according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments of the present invention are illustrative only and are not limiting upon the present invention. In addition, only some structures, not all structures, relevant to the present invention are shown in the drawings, and therefore, in all the drawings of the present invention, the solid black dots on two intersecting lines indicate cross connection, and the solid black dots on two intersecting lines do not indicate cross disconnection.
The current battery capacity expansion mode of the power battery system is mainly to expand the battery capacity of a battery pack in the power battery system, and after a manufacturer finishes expanding the battery capacity of the power battery system, a user cannot dynamically expand the battery capacity of the power battery system according to the requirement of the endurance mileage of the user. Therefore, how to dynamically expand the battery capacity of the power battery system according to the requirement of the endurance mileage of the user is a problem which needs to be solved urgently at present.
The utility model is described in further detail below with reference to the figures and specific embodiments.
First, referring to fig. 1, the operation principle between a Power Management System (PMS) and a Battery Management System (BMS) in the Power Battery System according to the present invention will be briefly described. The BMSs are connected to the PMS through the CAN bus and the ID line so as to expand the battery capacity of the power battery system; the PMS manages state parameters and charging and discharging of a plurality of expanded BMSs in a unified mode through a Controller Area Network (CAN) bus and an ID line, wherein the ID line is used for detecting whether the BMS is connected to the PMS or not, the CAN bus is used for transmitting the state parameters of the BMS to the PMS, the state parameters comprise temperature, residual capacity, health state and the like, the PMS is further used for sending a battery control command to the BMS, the battery control command comprises a battery charging command, a battery discharging command and a battery charging and discharging command, the battery charging command is used for charging the BMS, the battery discharging command is used for discharging the BMS, and the battery charging and discharging command is used for discharging and charging the BMS at the same time. For example, the manufacturer connects a plurality of BMSs to the PMSs in parallel, that is, a positive electrode (P +) of each BMS is connected to a negative electrode (P-) of each BMS, and the plurality of BMSs are connected in parallel to provide power output to the outside (see fig. 1). However, after the power battery system manufactured by a manufacturer is shipped, the battery capacity of the power battery system is unchangeable, and a user cannot conveniently and dynamically expand the battery capacity of the power battery system according to the travel requirement of the user. The power battery system can be convenient for users to dynamically expand the battery capacity of the power battery system according to the travel requirements of the users.
A power battery system provided by the present application is described in detail below with reference to fig. 2. The application provides a power battery system includes: the battery management system comprises a shell 10, a power management system 100 and a first battery management system 200, wherein a first interface 11 and a second interface 12 are arranged outside the shell 10; the power management system 100 is located inside the housing 10, and establishes communication connection with the first battery management system 200 through a CAN bus and an ID line passing through the first interface 11, so as to manage access of the first battery management system 200 and charging and discharging of the first battery management system 200; and the first battery management system 200, located outside the housing 10, is used for determining that the first battery management system 200 is connected to the power management system 100 by detecting a level signal of the ID line, and establishing power connection with the power output end through the second interface 12 in response to a first battery control command of the power management system 100 through the CAN bus.
As an example, the power battery system facilitates user expansion of the battery capacity of the power battery system by providing a first interface 11 and a second interface 12 on the external housing 10 of the power management system 100. For example, when the power battery system leaves the factory, the first interface 11 and the second interface 12 are arranged outside the housing 10 where the power management system 100 is located, and a user CAN access the first battery management system 200 to the power management system 100 through the CAN bus and the ID line through the first interface 11 according to the mileage requirement of the user, so that the power management system 100 manages the state parameters and charging and discharging of the first battery management system 200 through the CAN bus, and when the electric quantity of the first battery management system 200 is low, the user CAN replace the first battery management system 200 with the battery management system with larger battery capacity, thereby meeting the mileage requirement of the user. Therefore, the power battery system provided by the utility model manages the accessed battery management system in a mode of arranging the external interface and the CAN bus, and CAN facilitate a user to dynamically expand the battery capacity of the power battery system according to the requirement of the endurance mileage of the user.
As another alternative example, as shown in fig. 3, the power cell system includes: the power battery system includes a case 10, a power management system 100, and a first battery management system 200, wherein a first interface 11 and a second interface 12 are provided outside the case 10, a fifth interface 15 is provided outside the case 10, and the power battery system is charged and discharged through the fifth interface 15. The housing 10 is made of an insulating material, for example, plastic, the first interface 11 is used for the first battery management system 200 to establish a communication connection with the power management system 100 through a CAN bus and an ID line, the second interface 12 is used for the first battery management system 200 to establish an electrical connection with a power output terminal, and after the first battery management system 200 establishes the electrical connection with the power output terminal, the power is supplied to the outside through the fifth interface 15.
Alternatively, the first interface 11 and the second interface 12 are a single interface having a PLC (Power Line Communication) function and a CAN function. The PLC circuit CAN transmit both strong and weak electric signals, and therefore, the second battery management system 300 CAN implement both the CAN communication between the external battery management system and the internal power management system and the power output (or input) of the external battery management system through one interface, thereby reducing the possibility of inserting a wrong interface by a user and improving user experience.
And the fifth interface 15 is used for charging and discharging the power battery system through the fifth interface 15. For example, when the battery capacity of the power battery system is low, the user can charge the power battery system through the fifth interface 15; when a user desires to use an electric vehicle that incorporates the power battery system, at this point, the power battery system discharges to the outside to provide power to the electric vehicle. For example, as shown in fig. 3, when the first battery management system 200 accesses the power management system 100 through the first interface 11, the fifth interface 15 is used for providing power to the outside after the first battery management system 200 establishes power connection with the power output terminal. In addition, when a user needs to replace the power battery system, the user can take the old power battery system out of the electronic equipment (such as an electric vehicle) and insert the power output end of the new power battery system into the fifth interface 15, so that the replacement of the whole power system is not needed, and the cost of replacing the battery by the user can be reduced.
The power management system 100 includes a CAN module 101 and a power management module 102, where the CAN module 101 is configured to communicate data with a battery management system, for example, the CAN module 101 establishes a communication connection with the first battery management system 200 through a CAN bus, and is configured to acquire state parameters (such as temperature, remaining battery capacity, health status, and the like) of the first battery management system 200 and send a first battery control instruction to the first battery management system 200, where the first battery control instruction includes a battery charging instruction, a battery discharging instruction, and a battery charging/discharging instruction.
The power management module 102 is connected to the CAN module 101, and configured to generate a first battery control instruction according to the state parameter of the first battery management system 200 and send the first battery control instruction to the CAN module 101, for example, the remaining power of the first battery management system 200 is 10%, at this time, the power management module 102 generates a battery charging instruction according to the remaining power of the first battery management system 200 and sends the battery charging instruction to the first battery management system 200 through the CAN module 101, and the first battery management system 200 executes a charging action according to the battery charging instruction. For another example, when a user needs an electric vehicle including the power battery system, the power management system 100 obtains the state parameters of the first battery management system 200 from the first battery management system 200, and if the state of health of the first battery management system 200 is 80%, the temperature is 25 ℃, and the remaining power is 90%, the power management module 102 generates a battery discharge instruction according to the current state parameters of the first battery management system 200, and sends the battery discharge instruction to the first battery management system 200 through the CAN module 101, and the first battery management system 200 provides electric energy for the electric vehicle according to the battery discharge instruction.
Optionally, the first battery management system 200 includes a first CAN module 201, a first battery pack management module 202, and a first detection module 203, where the first CAN module 201 establishes a communication connection with the CAN module 101 through a CAN bus, and is configured to send a state parameter of a first battery pack acquired by the first battery pack management module 202 to the CAN module 101 through the CAN bus, where the state parameter of the first battery pack includes a temperature, a remaining capacity, and a health state of a battery (or a battery pack), where the health state of the battery refers to a capacity of the current battery for storing electric energy in a new battery, and an index used for evaluating the health state of the battery includes a capacity, an electric quantity, an internal resistance, a cycle number, a peak power, and the like of the battery. The CAN module 101 sends the received state parameter of the first battery pack to the power management module 102, and the power management module 102 generates a first battery control command (such as a battery charging command) according to the state parameter of the first battery pack.
The CAN bus is used for establishing a communication connection between the first battery management system 200 and the power management system 100, and the communication between the first battery management system 200 and the power management system 100 (i.e. the communication between the first CAN module 201 and the CAN module 101) may adopt a fixed address mode or a dynamic address allocation mode, which is not limited in this application; in addition, the ID line is used for the first battery management system 200 to detect whether the first battery management system 200 has its own access to the power management system 100, for example, the first battery management system 200 detects the ID line as a low signal, which indicates that the first battery management system 200 has been normally accessed to the power management system 100.
The first battery pack management module 202 is connected to the first CAN module 201, and is configured to manage state parameters of the first battery pack and receive a first battery control instruction sent by the first CAN module 201, where the first battery control instruction includes a battery charging instruction, a battery discharging instruction, and a battery charging/discharging instruction. For example, the first battery pack management module 202 sends the current state parameters of the first battery pack, such as the current temperature, the percentage of remaining power, and the state of health of the first battery pack, to the CAN module 101, so that the power management module 102 generates the first battery control command according to the current state parameters of the first battery pack. The power management module 102 sends the generated first battery control instruction to the CAN module 101, the CAN module 101 sends the first battery control instruction to the first CAN module 201, the first CAN module 201 sends the received first battery control instruction to the first battery pack management module 202, and the first battery pack management module 202 controls the first battery pack to act according to the first battery control instruction, for example, controls the first battery pack to be charged, discharged or charged and discharged.
The first detection module 203 is connected to the ground terminal of the power management module 102 through an ID line, and the first battery management system 200 detects a level signal of the ID line by using the first detection module 203 to determine whether the first battery management system 200 is connected to the power management system 100. For example, if the first battery management system 200 detects that the ID line is a high-level signal by using the first detection module 203, it may be determined that the ID line of the first battery management system 200 is not connected to the ground terminal of the power management module 102 and is in a floating state; if the first battery management system 200 detects that the ID line is a low signal by using the first detection module 203, it can be determined that the ID line of the first battery management system 200 is already connected to the ground terminal of the power management module 102, and at this time, the first battery management system 200 can perform normal communication with the power management system 100.
As another alternative example, fig. 4 illustrates another power battery system provided by an embodiment of the present invention, where the power battery system includes: the battery management system comprises a shell 10, a power management system 100, a first battery management system 200 and a second battery management system 300, wherein a first interface 11, a second interface 12 and a fifth interface 15 are arranged outside the shell 10, and a third interface 13 and a fourth interface 14 are also arranged outside the shell; the second battery management system 300 is located outside the housing 10, and is in communication connection with the power management system 100 through a CAN bus and an ID line via the third interface 13, and is configured to determine that the second battery management system 300 is connected to the power management system 100 by detecting a level signal of the ID line, and establish power connection with a power output terminal via the fourth interface 14 in response to a second battery control command of the power management system 100 through the CAN bus.
The first interface 11 is used for the first battery management system 200 to establish a communication connection with the power management system 100 through a CAN bus and an ID line, the second interface 12 is used for the first battery management system 200 to establish a power connection with a power output terminal, the third interface 13 is used for the second battery management system 300 to establish a communication connection with the power management system 100 through a CAN bus and an ID line, the fourth interface 14 is used for the second battery management system 300 to establish a power connection with a power output terminal, when the second battery management system 300 is connected to the power management system 100 in parallel with the first battery management system 200, i.e. the positive pole (+) of the second battery management system 300 is connected to the positive pole (+) of the first battery management system 200, and, the negative pole (-) of the second battery management system 300 is connected to the negative pole (-) of the first battery management system 200, and the second battery management system 300 supplies power to the outside through the fifth interface 15 in common with the first battery management system 200.
As an alternative example, the user expands the battery capacity of the power battery system through the third interface 13 and the fourth interface 14 provided on the housing 10 by the power management system 100. For example, when the power battery system is shipped from a factory, the power management system 100 is further provided with a third interface 13 and a fourth interface 14 on the housing 10, wherein the first battery management system 200 has been accessed to the power management system 100 through the first interface 11 and the second interface 12, and now a user CAN access the second battery management system 300 to the power management system 100 through the CAN bus and the ID line via the third interface 13 according to the requirement of the cruising range of the user, so that the power management system 100 CAN manage the state parameters and charging and discharging of the second battery management system 300; in addition, the second battery management system 300 establishes an electric power connection with the power output terminal through the fourth interface 14, and provides a power output together with the first battery management system 200, so that the user completes the expansion of the battery capacity of the power battery system. Therefore, the power battery system provided by the utility model CAN be used for managing the accessed multiple battery management systems in a CAN bus mode by arranging the multiple external interfaces, so that a user CAN conveniently and dynamically expand the battery capacity of the power battery system according to the requirement of the endurance mileage of the user.
Optionally, the third interface 13 and the fourth interface 14 are one interface having a PLC function and a CAN function. The PLC circuit CAN transmit both strong and weak electric signals, and therefore, the second battery management system 300 CAN implement both the CAN communication between the external battery management system and the internal power management system and the power output (or input) of the external battery management system through one interface, thereby reducing the possibility of inserting a wrong interface by a user and improving user experience.
Illustratively, as shown in fig. 5, when the second battery management system 300 is connected to the power management system 100 in parallel with the first battery management system 200, the fifth interface 15 is used for a general output interface for providing power to the outside after the second battery management system 300 is connected to the first battery management system 200 in parallel. In addition, when a user needs to replace the power battery system, the user can take the old power battery system out of the electronic equipment (such as an electric vehicle) and insert the power output end of the new power battery system into the fifth interface 15, so that the replacement of the whole power system is not needed, and the cost of replacing the battery by the user can be reduced.
As an alternative example, as shown in fig. 5, the power management system 100 includes a CAN module 101 and a power management module 102, where the CAN module 101 establishes a communication connection with the second battery management system 300 through a CAN bus, and is configured to acquire state parameters (such as temperature, remaining battery capacity, health status, etc.) of the second battery management system 300 and send a second battery control command to the second battery management system 300; and the power management module 102 is connected to the CAN module 101, and configured to generate a second battery control instruction according to the state parameter of the second battery management system 300 and send the second battery control instruction to the CAN module 101.
The power management module 102 is connected to the CAN module 101, and configured to generate a second battery control instruction according to the state parameter of the second battery management system 300 and send the second battery control instruction to the CAN module 101, for example, the remaining power of the second battery management system 300 is 10%, at this time, the power management module 102 generates a battery charging instruction according to the remaining power of the second battery management system 300 and sends the battery charging instruction to the first battery management system 200 through the CAN module 101, and the second battery management system 300 executes a charging action according to the battery charging instruction. For another example, when a user needs an electric vehicle including the power battery system, the power management system 100 obtains the state parameters of the second battery management system 300 from the second battery management system 300, and if the state of health of the second battery management system 300 is 80%, the temperature is 25 ℃, and the remaining power is 90%, the power management module 102 generates a battery discharge instruction according to the current state parameters of the second battery management system 300, and sends the battery discharge instruction to the second battery management system 300 through the CAN module 101, and the second battery management system 300 provides electric energy for the electric vehicle according to the battery discharge instruction.
Optionally, the second battery management system 300 includes a second CAN module 301, a second battery pack management module 302, and a second detection module 303, where the second CAN module 301 establishes a communication connection with the CAN module 101 through a CAN bus, and is configured to send the state parameters of the second battery pack, acquired by the second battery pack management module 302, to the CAN module 101 through the CAN bus; the state parameters of the second battery pack comprise the temperature, the remaining capacity and the state of health of the battery (or the battery pack). For example, the second battery management system 300 establishes a communication connection with the power management system 100 by means of dynamic address allocation, specifically, the second battery management system 300 uses the second CAN module 301 to send an access request message to the power management system 100 through the CAN bus, where the second battery management system 300 may send the access request message (i.e., an address allocation request) to the power management system 100 through the CAN bus by using a temporary random address, the power management system 100 allocates a second communication address to the second battery management system 300 according to the received access request message, and then the second battery management system 300 uses the second communication address to perform data communication with the power management system 100 through the CAN bus. In the present application, the second battery management system 300 requests the power management system 100 to assign an address to the second battery management system, and other existing address assignment methods may also be used, which is not limited in this application.
The second battery pack management module 302 is connected with the second CAN module 301 and is used for managing the state parameters of the second battery pack and receiving a second battery control instruction sent by the second CAN module 301; the second battery control command comprises a battery charging command, a battery discharging command and a battery charging and discharging command. For example, the second battery pack management module 302 sends the current state parameters of the second battery pack, such as the current temperature, the percentage of remaining power, and the state of health of the second battery pack, to the CAN module 101, so that the power management module 102 generates the second battery control command according to the current state parameters of the second battery pack. The power management module 102 sends the generated second battery control instruction to the CAN module 101, the CAN module 101 sends the second battery control instruction to the second CAN module 301, the second CAN module 301 sends the received second battery control instruction to the second battery pack management module 302, and the second battery pack management module 302 controls the second battery pack to act according to the first battery control instruction, for example, controls the second battery pack to be charged, discharged or charged and discharged.
The second detecting module 303 is connected to the ground terminal of the power management module 102 through an ID line, and is configured to determine whether the second battery management system 300 is connected to the power management system 100 by detecting a level signal of the ID line. For example, if the second battery management system 300 detects that the ID line is a high-level signal by using the second detection module 303, it may be determined that the ID line of the second battery management system 300 is not connected to the ground terminal of the power management module 102 and is in a floating state; if the second battery management system 300 detects that the ID line is a low signal by using the second detection module 303, it can be determined that the ID line of the second battery management system 300 is connected to the ground terminal of the power management module 102, and at this time, the second battery management system 300 can perform normal communication with the power management system 100.
Alternatively, the first battery management system 200 and the second battery management system 300 are the same type of battery management system, and the battery capacity expansion of the power battery system is performed by using the same type of battery management system, so that the situation that the battery capacity expansion fails due to different voltages of each battery management system when the battery management systems are connected in parallel can be avoided. The present application does not limit the specific models of the first battery management system 200 and the second battery management system 300, as long as the two types are the same, and the present application is within the protection scope of the present application.
Optionally, in practical applications, when the technical solution provided by the present application is used to expand the battery capacity of the power battery system, the number of the users accessing the battery management system to the power management system 100 is determined by the users according to the requirement of the endurance mileage, and the longer the endurance mileage is, the more the users need to access the battery management system to the power management system 100. In the present application, a power battery system is described by taking an example in which one battery management system and two battery management systems are externally connected to the power management system 100 (see fig. 2 to 5), and when more than two battery management systems are externally connected to the power management system 100, the connection principle is the same as the expansion principle of the battery capacity of the power battery system shown in fig. 2 to 5, and details are not repeated herein. In addition, the present application is not limited to the manner in which the plurality of battery management systems are externally connected to the power management system 100, for example, the plurality of battery management systems may be connected in parallel or in series.
For ease of understanding, the workflow of a PMS (i.e., power management system 100) of a power battery system provided herein is illustrated below with reference to fig. 6 and 7. First, the work flow of the PMS communicating with the BMS (i.e., the battery management system, such as the first battery management system 200 or the second battery management system 300) in the present application, respectively using the fixed address (as shown in fig. 6) and the dynamic address allocation (as shown in fig. 7), is described as follows:
step 1: a new battery (i.e., a new BMS) is accessed. Taking the example that the new BMS establishes a communication connection with the PMS in a fixed address manner, a user needs to access a new BMS to the PMS, the new BMS has written a fixed address into a communication interface of the new BMS by a manufacturer before the new BMS leaves a factory, at this time, the new BMS requests the PMS for access, the fixed address is sent to the PMS, and the PMS establishes a communication connection with the new BMS by using the fixed address. For another example, the new BMS requests an access to the PMS in a dynamic address assignment manner, the new BMS sends an access request message to the PMS through the CAN bus, wherein the new BMS CAN send the access request message (i.e., an address assignment request) to the PMS through the CAN bus using a temporary random address, the PMS assigns a new communication address to the new BMS according to the received access request message, and thereafter, the new BMS performs data communication with the BMS through the CAN bus using the new communication address.
Step 2: after the BMS requests to access the PMS, whether the BMS accesses the PMS or not is determined by detecting a level signal of the ID line, and if the BMS determines that the BMS accesses the PMS normally, an accessed determination message is sent to the PMS by using the fixed address to inform the PMS that the PMS accesses the PMS. Meanwhile, the PMS can regularly read the battery information (namely the state parameters of the BMS) of the BMS after knowing that the BMS is accessed, and the BMS is considered to be disconnected after the BMS data is continuously and repeatedly read.
And step 3: the PMS automatically manages all the accessed BMSs. For example, all BMSs access the PMS in parallel. At this time, the PMS actively reads the information of all the BMSs at regular time, for example, the unique ID, voltage, charge and discharge state, and fault state of each BMS, and controls the charge and discharge function of each BMS as follows:
A. when a new BMS is accessed, if the voltages of each BMS acquired by the PMS are the same (namely the voltages of all BMSs are the same), the PMS sends a battery charging and discharging control command to open the charging and discharging functions of all BMSs;
B. when a new BMS is accessed, and the voltage of the newly accessed BMS is higher than that of the current discharging BMS, the PMS immediately sends a battery charging closing control command to the current discharging BMS so that the current discharging BMS closes the charging function of the current discharging BMS, and sends a battery charging and discharging opening control command to the new BMS so that the new BMS opens the charging and discharging function;
C. when a new BMS is accessed and the voltage of the newly accessed BMS is lower than the voltage of the currently discharged BMS, the PMS immediately sends a battery discharge starting control command to the new BMS so that the new BMS immediately starts the discharge function of the new BMS;
D. when the BMSs are removed, the PMS finds the BMS with the highest voltage in the rest BMSs, and sends a command for starting the charging and discharging of the battery to the BMS with the highest voltage so as to facilitate the BMS with the highest voltage to start the charging and discharging function of the BMS, and sends a command for stopping the charging of the battery to the rest BMSs so as to facilitate the rest BMSs to stop the charging function of the BMS and only start the discharging function;
E. as the discharging proceeds, when the discharged BMS voltage drops to be the same as the other BMS voltage, the PMS controls the other BMS to turn on its charging function;
controlling the final charge and discharge states of all BMSs accessed to the PMS by the PMS to be as follows: the BMS at the highest voltage turns on the charge and discharge function, and the other BMSs turn on the discharge function and turn off the charge function thereof, and it is guaranteed that this state is maintained all the time after the BMS is accessed, removed, discharged (step down).
Optionally, the present embodiment further provides an electric vehicle 800, where the electric vehicle 800 includes the above power battery system 801, as shown in fig. 8. The power battery system has already been described in detail above, and will not be described in detail herein.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: it is to be understood that modifications may be made to the above-described embodiments, or equivalents may be substituted for some of the features of the embodiments, and such modifications or substitutions are not to be construed as essential to the spirit and scope of the embodiments of the present invention.
Claims (10)
1. A power battery system, comprising: a housing (10), a power management system (100), a first battery management system (200),
a first interface (11) and a second interface (12) are arranged outside the shell (10);
the power management system (100) is located inside the shell (10), and is in communication connection with the first battery management system (200) through a CAN bus and an ID line passing through the first interface (11) and used for managing access of the first battery management system (200) and charging and discharging of the first battery management system (200);
the first battery management system (200) is located outside the shell (10) and used for determining that the first battery management system (200) is connected to the power supply management system (100) through detecting a level signal of an ID line, and responding to a first battery control command of the power supply management system (100) through a CAN bus and establishing power connection with a power supply output end through a second interface (12).
2. Power battery system according to claim 1, characterized in that the power management system (100) comprises a CAN module (101) and a power management module (102),
the CAN module (101) is in communication connection with the first battery management system (200) through a CAN bus, and is used for acquiring state parameters of the first battery management system (200) and sending the first battery control command to the first battery management system (200);
and the power management module (102) is connected with the CAN module (101) and is used for generating the first battery control instruction according to the state parameter of the first battery management system (200) and sending the first battery control instruction to the CAN module (101).
3. Power battery system according to claim 2, characterized in that the first battery management system (200) comprises a first CAN module (201), a first battery pack management module (202) and a first detection module (203),
the first CAN module (201) is in communication connection with the CAN module (101) through a CAN bus and used for sending the state parameters of the first battery pack acquired by the first battery pack management module (202) to the CAN module (101) through the CAN bus;
the first battery pack management module (202) is connected with the first CAN module (201) and is used for managing the state parameters of a first battery pack and receiving the first battery control instruction sent by the first CAN module (201);
the first detection module (203) is connected with the grounding end of the power management module (102) through an ID line and is used for determining whether the first battery management system (200) is connected to the power management system (100) or not by detecting a level signal of the ID line.
4. The power cell system of any of claims 1-3, further comprising: a second battery management system (300), a third interface (13) and a fourth interface (14) are arranged outside the shell (10),
the second battery management system (300) is located outside the shell (10), is in communication connection with the power management system (100) through a CAN bus and an ID line passing through the third interface (13), is used for determining that the second battery management system (300) is connected to the power management system (100) through detecting a level signal of the ID line, responds to a second battery control command of the power management system (100) through the CAN bus, and is in power connection with the power output end through the fourth interface (14).
5. Power cell system according to claim 4, characterized in that the power management system (100) comprises a CAN module (101) and a power management module (102),
the CAN module (101) is in communication connection with the second battery management system (300) through a CAN bus, and is used for acquiring state parameters of the second battery management system (300) and sending a second battery control instruction to the second battery management system (300);
and the power management module (102) is connected with the CAN module (101) and is used for generating the second battery control instruction according to the state parameter of the second battery management system (300) and sending the second battery control instruction to the CAN module (101).
6. Power battery system according to claim 5, characterized in that the second battery management system (300) comprises a second CAN module (301), a second battery pack management module (302) and a second detection module (303),
the second CAN module (301) is in communication connection with the CAN module (101) through a CAN bus and is used for sending the state parameters of the second battery pack acquired by the second battery pack management module (302) to the CAN module (101) through the CAN bus;
the second battery pack management module (302) is connected with the second CAN module (301) and is used for managing the state parameters of a second battery pack and receiving the second battery control instruction sent by the second CAN module (301);
and the second detection module (303) is connected with the grounding end of the power management module (102) through an ID line and is used for determining whether the second battery management system (300) is connected to the power management system (100) or not by detecting a level signal of the ID line.
7. Power battery system according to claim 4, characterized in that the first battery management system (200) and the second battery management system (300) are battery management systems of the same type.
8. Power cell system according to claim 4, characterized in that the third interface (13) and the fourth interface (14) are one interface with PLC function and CAN function.
9. Power cell system according to one of claims 1 to 3, characterized in that the first interface (11) and the second interface (12) are one interface with PLC function and CAN function.
10. An electric vehicle, characterized in that it comprises a power battery system according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121129553.9U CN215418432U (en) | 2021-05-25 | 2021-05-25 | Power battery system and electric vehicle |
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| CN202121129553.9U CN215418432U (en) | 2021-05-25 | 2021-05-25 | Power battery system and electric vehicle |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114400739A (en) * | 2022-01-10 | 2022-04-26 | 福建时代星云科技有限公司 | Connect safe distributed portable power source |
| CN114530636A (en) * | 2022-01-10 | 2022-05-24 | 福建时代星云科技有限公司 | Improve basic package and battery package connection control's mobile energy storage power supply system |
-
2021
- 2021-05-25 CN CN202121129553.9U patent/CN215418432U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114400739A (en) * | 2022-01-10 | 2022-04-26 | 福建时代星云科技有限公司 | Connect safe distributed portable power source |
| CN114530636A (en) * | 2022-01-10 | 2022-05-24 | 福建时代星云科技有限公司 | Improve basic package and battery package connection control's mobile energy storage power supply system |
| CN114530636B (en) * | 2022-01-10 | 2022-11-22 | 福建时代星云科技有限公司 | Improve basic package and battery package connection control's mobile energy storage power supply system |
| WO2023130505A1 (en) * | 2022-01-10 | 2023-07-13 | 福建时代星云科技有限公司 | Mobile energy storage power supply system for improving connection control of base pack and battery pack |
| WO2023130506A1 (en) * | 2022-01-10 | 2023-07-13 | 福建时代星云科技有限公司 | Distributed portable mobile power supply with safe connection |
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