CN110936853B - Battery balancing device with multiple motor batteries, balancing method and electric vehicle - Google Patents

Battery balancing device with multiple motor batteries, balancing method and electric vehicle Download PDF

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Publication number
CN110936853B
CN110936853B CN201811110336.8A CN201811110336A CN110936853B CN 110936853 B CN110936853 B CN 110936853B CN 201811110336 A CN201811110336 A CN 201811110336A CN 110936853 B CN110936853 B CN 110936853B
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China
Prior art keywords
battery
equalization
electric quantity
quantity information
balanced
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CN201811110336.8A
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Chinese (zh)
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CN110936853A (en
Inventor
余晓华
胡林玉
王海洋
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Chongqing Guangyiyuan Battery Co ltd
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Chongqing Guangyiyuan Battery Co ltd
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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0014—Circuits for equalisation of charge between batteries
    • H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The application provides a battery balancing device with a plurality of motor batteries, a balancing method and an electric vehicle, wherein the battery balancing device at least comprises: the monitor is used for respectively acquiring the electric quantity information of the batteries; the first equalization component and the second equalization component are respectively used for equalizing electric quantity of the batteries; the controller is connected with the monitor, the first equalization component and the second equalization component respectively, and is used for acquiring a first battery to be equalized and a second battery to be equalized, of which the electric quantity information is smaller than the preset electric quantity information, according to the electric quantity information of the batteries, controlling the first equalization component to perform electric quantity information equalization on the first battery to be equalized and controlling the second equalization component to perform electric quantity information equalization on the second battery to be equalized. Through the mode, the electric quantity information of the batteries can be balanced, so that the electric quantity information of the battery pack with serious cracking is balanced, the waste of electric energy can be avoided, and the electric quantity of the original battery pack is kept.

Description

Battery balancing device with multiple motor batteries, balancing method and electric vehicle
Technical Field
The present disclosure relates to the field of battery balancing technologies, and in particular, to a battery balancing device and balancing method with multiple mobile batteries, and an electric vehicle.
Background
Both electric vehicles and hybrid vehicles require a battery pack as an energy storage system. A battery pack is generally composed of a plurality of cells connected in series. Due to various factors in the battery manufacturing process and the use process, there may be cases where the residual electric power values are not uniform between the batteries connected in series. Imbalance between cells can reduce the available capacity of the overall battery pack.
In the long-term research and development process, the inventor of the application can only perform electric quantity equalization on a few batteries in the battery pack at present, when the battery pack is seriously cracked, when a plurality of batteries need to perform electric quantity equalization, an obvious electric quantity equalization effect cannot be achieved, and the battery pack equalization at present needs to discharge the battery with high electric quantity or equalize the battery with high electric quantity and the battery with low electric quantity, so that electric energy is wasted, and the electric quantity of the original battery pack cannot be recovered.
Disclosure of Invention
The technical problem that this application mainly solves is to provide a battery balancing unit and balanced method, electric motor car with a plurality of mobile batteries to realize carrying out electric quantity information equilibrium to a plurality of batteries, and avoid extravagant electric energy, keep the electric quantity of former battery group.
To solve the above technical problem, the present application provides a battery balancing device with a plurality of motor batteries, where the battery balancing device is used for an electric vehicle, the electric vehicle includes a battery pack and a battery balancing device, the battery pack includes a plurality of batteries connected in series, and the battery balancing device at least includes: the monitor is used for respectively acquiring the electric quantity information of the batteries; the first equalization component and the second equalization component are respectively used for equalizing electric quantity of the batteries; the controller is connected with the monitor, the first equalization component and the second equalization component respectively, and is used for acquiring a first battery to be equalized and a second battery to be equalized, of which the electric quantity information is smaller than the preset electric quantity information, according to the electric quantity information of the batteries, controlling the first equalization component to perform electric quantity information equalization on the first battery to be equalized and controlling the second equalization component to perform electric quantity information equalization on the second battery to be equalized.
Wherein the first equalization component comprises: the first power battery and the first switch component are coupled with the controller, one end of the first switch component is connected with the first power battery, and the other end of the first switch component is connected with the battery; the second equalization assembly comprises a second mobile battery and a second switch assembly, one end of the second switch assembly is connected with the second mobile battery, and the other end of the second switch assembly is connected with the battery; the controller controls the first switch assembly to connect the first mobile battery with the first battery to be balanced so that the first mobile battery can balance the electric quantity of the first battery to be balanced, and controls the second switch assembly to connect the second mobile battery with the second battery to be balanced so that the second mobile battery can balance the electric quantity of the second battery to be balanced.
The first equalization component is provided with a first plug port, the second equalization component is provided with a second plug port, and the first plug port is connected with the second plug port to enable the first equalization component and the second equalization component to be arranged in a laminated mode.
The first switch component comprises a plurality of first terminals, second terminals, a contact disc and a movable pointer, wherein the second terminals are arranged in the middle area of the contact disc, the first terminals are distributed on the outer side of the middle area in an arrangement mode, one end of the movable pointer is connected with the second terminals, and when the controller controls the switch component to connect the motor battery with the battery to be balanced, the other end of the movable pointer rotates to the first terminals connected with the battery to be balanced so that the second terminals are connected with the first terminals.
The first terminals of the first switch assembly are correspondingly arranged with the first terminals of the second switch assembly.
The first equalization assembly further comprises a shell and a fixed plate, wherein the contact disc is arranged at the bottom of the shell, the fixed plate is fixed on the shell through a rotating shaft, the movable pointer is arranged on the fixed plate, and the other end of the movable pointer is arranged on the surface, close to the contact disc, of the fixed plate; the first balancing component further comprises a motor, a spring and a connecting piece, wherein the motor is respectively connected with the controller and the connecting piece, and the spring is arranged between the contact disc and the fixed plate; the controller controls the motor to work, the motor drives the connecting piece to be connected with the fixed plate, and the connecting piece drives the fixed plate to rotate under the drive of the motor so that the other end of the movable pointer rotates to a first terminal connected with a battery to be balanced; the first equalization assembly further includes a detent switch disposed on a side wall of the housing and disposed in correspondence with the fixed plate, the detent switch being configured to hold the fixed plate in a selected one of the directions and to position the fixed plate.
Wherein the first equalization component comprises: the battery compartment is used for accommodating the first mobile battery, the motor is connected with the connecting piece through the connecting rod, one side, away from the motor, of the connecting piece is provided with an inclined surface contact pin, the fixing plate is provided with a through hole, the through hole is used for accommodating the inclined surface contact pin, one side, away from the connecting piece, of the fixing plate is provided with an elastic sheet, a limiting shaft is arranged at the bottom of the shell, and the fixing plate is arranged on the limiting shaft and moves along the limiting shaft.
The first switch assembly comprises a first terminal, a guide rail, a second terminal and a connecting piece which are arranged in a straight line, one end of the connecting piece is sleeved on the guide rail, the other end of the connecting piece is selectively connected with the first terminal, a plurality of first terminals are arranged in parallel with the guide rail, the second terminal is connected with one end of the connecting piece, the first terminal is connected with a battery, and the second terminal is connected with a first mobile battery; when the controller controls the first switch assembly to connect the first motor battery and the first battery to be balanced, the connecting piece moves along the guide rail so that the other end of the connecting piece is connected with the first terminal connected with the first battery to be balanced.
In order to solve the technical problems, the application also provides a battery pack equalization method. The battery balancing method is used for balancing electric quantity information of a battery pack by a battery balancing device, the battery pack comprises a plurality of batteries connected in series, the battery balancing device is used for balancing electric quantity of the batteries, the battery balancing device at least comprises a monitor, a first balancing component, a second balancing component and a controller, and the battery balancing method comprises the following steps: the controller acquires electric quantity information of a plurality of batteries through the monitor; the controller compares the electric quantity information with preset electric quantity information to obtain a first battery to be balanced and a second battery to be balanced, wherein the electric quantity information is smaller than the preset electric quantity information; the controller controls the first equalization component to perform electric quantity equalization on the first battery to be equalized, and controls the second equalization component to perform electric quantity equalization on the second battery to be equalized.
In order to solve the technical problem, the application also provides an electric vehicle which comprises a battery pack and the battery balancing device.
Compared with the prior art, the beneficial effects of this application are: the embodiment of the application is provided with a battery balancing device with a plurality of motor batteries, a balancing method and an electric vehicle, wherein the battery balancing device is used for the electric vehicle, the electric vehicle comprises a battery pack and a battery balancing device, the battery pack comprises a plurality of batteries connected in series, and the battery balancing device at least comprises: the monitor is used for respectively acquiring the electric quantity information of the batteries; the first equalization component and the second equalization component are respectively used for equalizing electric quantity of the batteries; the controller is connected with the monitor, the first equalization circuit and the second equalization circuit respectively, and is used for acquiring a first battery to be equalized and a second battery to be equalized, of which the electric quantity information is smaller than the preset electric quantity information, according to the electric quantity information of the batteries, controlling the first equalization component to conduct electric quantity equalization on the first battery to be equalized and controlling the second equalization component to conduct electric quantity equalization on the second battery to be equalized. Through the mode, the embodiment of the application can balance the electric quantity information through at least two balance components to at least two battery packs with serious cracking, and meanwhile, the embodiment of the application can monitor the electric quantity information of the battery, and balance the electric quantity information of the battery when the electric quantity information of the battery is smaller than the preset electric quantity information, so that electric energy waste can be avoided, and the electric quantity of the original battery pack is kept.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
fig. 1 is a structure of a first embodiment of a battery balancing apparatus having a plurality of motor batteries according to the present application
A schematic diagram;
FIG. 2 is a flow chart of an embodiment of a battery equalization method of the present application;
fig. 3 is a schematic view of a part of the structure of the battery equalization device of the embodiment of fig. 1;
fig. 4 is a schematic view of the structure of the battery pack of fig. 1;
fig. 5 is a schematic illustration of a first equalization assembly in a battery equalization device having a plurality of motorized batteries of the present application
A schematic structural diagram of a second embodiment;
FIG. 6 is a schematic diagram of the first switch assembly of the embodiment of FIG. 5;
FIG. 7 is a flow chart of another embodiment of a battery equalization method of the present application;
fig. 8A is a first equalization assembly in a battery equalization device having a plurality of motorized batteries of the present application
A schematic structural diagram of a third embodiment;
FIG. 8B is a schematic illustration of the specific configuration of the contact disc of the embodiment of FIG. 8A;
FIG. 8C is a schematic view of the structure of the fixing plate in the embodiment of FIG. 8A;
FIG. 8D is a schematic illustration of the structure of the connector of the embodiment of FIG. 8A;
FIG. 8E is a left side view of the connector of the embodiment of FIG. 8C;
FIG. 8F is a front view of the connector of the embodiment of FIG. 8C;
FIG. 8G is a schematic diagram of the connection of the motorized battery to the battery pack of the embodiment of FIG. 8A;
fig. 9 is a schematic structural view of a fourth embodiment of the first equalization assembly of the present application;
fig. 10 is a schematic structural view of a fifth embodiment of the first equalization assembly of the present application;
fig. 11 is a schematic structural view of an embodiment of the electric vehicle of the present application.
Detailed Description
The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
Referring to fig. 1 and 2, fig. 1 is a schematic structural diagram of an embodiment of a battery balancing apparatus having a plurality of mobile batteries according to the present application; fig. 2 is a flow chart of an embodiment of a battery equalization method of the present application. The battery equalization apparatus 101 of the present embodiment is used for an electric vehicle, and the electric vehicle includes a battery pack 102 and a battery equalization apparatus 103 having a plurality of motor batteries, wherein the battery pack 102 includes a plurality of batteries 104 connected in series, and the battery equalization apparatus 103 of the present embodiment includes at least: the device comprises a monitor 105, a first equalization component 106, a second equalization component 107 and a controller 108, wherein the monitor 105 is used for respectively acquiring electric quantity information of a plurality of batteries 104; the first equalization component 106 and the second equalization component 107 are respectively configured to perform electric quantity equalization on the plurality of batteries 104; the controller 108 is respectively connected with the monitor 105, the first equalization component 106 and the second equalization component 107, and the controller 108 is configured to obtain a first battery to be equalized and a second battery to be equalized, the electric quantity information of which is smaller than the preset electric quantity information, according to the electric quantity information of the battery 104, control the first equalization component 106 to perform electric quantity equalization on the first battery to be equalized, and control the second equalization component 107 to perform electric quantity equalization on the second battery to be equalized.
The battery 104 charge information may specifically include at least one of a remaining charge of the battery 104, a battery voltage, a battery output voltage, or a battery output current.
The battery equalization method shown in fig. 2 can be used for the battery equalization apparatus 103 shown in fig. 1, and the method of this embodiment includes the steps of:
step S201: the controller 108 acquires the power information of the plurality of batteries 104 through the monitor 105.
Wherein, after the battery pack 102 completes the charging or discharging process, the monitor 105 monitors the electric quantity information of each battery 104 in real time. Specifically, the controller 108, upon receiving information that the battery pack 102 has completed charging or discharging, controls the monitor 105 to monitor the power information of each battery 104, and acquires the power information of each battery 104 from the monitor 105.
Step S202: the controller 108 compares the electric quantity information with the preset electric quantity information to obtain a first battery to be balanced and a second battery to be balanced, wherein the electric quantity information is smaller than the preset electric quantity information.
The controller 108 is preset with power information, the controller 108 obtains power information of each battery 104 from the monitor 105, and compares the power information of each battery 104 with the power information, for example, the controller 108 compares the remaining power of each battery 104 with the power information.
If the controller 108 determines that the electric quantity information is smaller than the electric quantity information, the controller 108 marks the battery 104 with the electric quantity information smaller than the electric quantity information as the first battery to be balanced and/or the second battery to be balanced, so as to obtain the first battery to be balanced and the second battery to be balanced, and step S203 is performed. If the controller 108 determines that the power information is greater than or equal to the power information, the controller 108 determines that the equalization process is not required for each battery 104, and ends.
Step S203: the controller 108 controls the first equalization component 105 to perform electric quantity equalization on the first battery to be equalized, and controls the second equalization component 106 to perform electric quantity equalization on the second battery to be equalized.
Of course, in other embodiments, the power information of the more than two to-be-balanced batteries can be balanced by more than two balancing components respectively.
Compared with the prior art, the battery balancing device with a plurality of mobile batteries can balance the electric quantity of at least two batteries to be balanced through at least two balancing components, and can balance electric quantity information of a battery pack with serious cracking.
Optionally, as shown in fig. 3 and 4, fig. 3 is a schematic view of a part of the structure of the battery balancing device in the embodiment of fig. 1; fig. 4 is a schematic view of the structure of the battery pack of fig. 1. The first equalization component (not labeled) of the present embodiment includes: the first mobile battery 301 and the first switch assembly 302, the first mobile battery 301 and the first switch assembly 302 are both coupled with the controller 108, one end of the first switch assembly 302 is connected with the first mobile battery 301, the other end of the first switch assembly 302 is connected with the battery 104, that is, the other end of the switch assembly 302 can be selectively connected with at least one battery of the plurality of batteries 104.
The controller 108 controls the first switching assembly 301 to connect the first mobile battery 302 and the first battery to be balanced 303 so that the first mobile battery 302 performs electric quantity balancing on the first battery to be balanced 303, and the controller 108 controls the second switching assembly to connect the second mobile battery and the second battery to be balanced so that the second mobile battery performs electric quantity balancing on the second battery to be balanced.
Specifically, the first equalization component 106 of the present embodiment may perform the electric quantity equalization on the first to-be-equalized battery 303 by the following method: when the controller 108 obtains the first battery to be balanced 303 through the above method, the controller 108 controls the first switch assembly 302 to be turned on through the control instruction, that is, one end of the first switch assembly 302 is connected to the other end, so as to connect the first mobile battery 301 and the first battery to be balanced 303. For example, one end of the first switch assembly 302 includes a first connection end and a second connection end, the other end of the first switch assembly 302 includes a third connection end and a fourth connection end, the first connection end and the second connection end are respectively connected with two ends of the first mobile battery 301, and the third connection end and the fourth connection end are respectively connected with two ends of the first battery 303 to be balanced; when one end of the first switch assembly 302 is connected to the other end, i.e., the first connection terminal is connected to the third connection terminal, the second connection terminal is connected to the fourth connection terminal.
When the first mobile battery 301 and the first battery to be balanced 303 are connected, the first mobile battery 301 and the first battery to be balanced 303 are balanced, and because the electric quantity of the first mobile battery 301 is greater than the electric quantity of the first battery to be balanced 303, the electric quantity information of the balanced first battery to be balanced 303 may be greater than or equal to the first electric quantity information.
Further, when the controller 108 determines that the power information is greater than or equal to the first power information, the controller 108 controls the first switch assembly 302 to disconnect the first mobile battery 301 from the first to-be-balanced battery 303, that is, after the first to-be-balanced battery 303 completes the balancing by the first mobile battery 301, the controller 108 controls one end and the other end of the first switch assembly 302 to disconnect, so that the first mobile battery 301 and the first to-be-balanced battery 303 are disconnected.
The monitor 105 is connected to the controller 108, and the monitor 105 is configured to monitor each battery 104 to obtain the power information of each battery 104. Wherein the monitor 105 may be connected to the positive and negative poles of each cell 104, respectively. The controller 108 may be a power management system (BMS, battery Management System) or a microcontroller.
Optionally, the first equalization component 106 of the present embodiment is provided with a first jack port 109, the second equalization component 107 is provided with a second jack port 110, and the first jack port 109 is connected with the second jack port 110 to laminate the first equalization component 106 with the second equalization component 107.
By this arrangement, the battery equalization device 103 can be downsized and its integration can be improved.
Alternatively, as shown in fig. 5 and 6, fig. 5 is a schematic structural view of a second embodiment of a first equalization assembly in a battery equalization device having a plurality of mobile batteries of the present application; fig. 6 is a schematic structural diagram of the first switch assembly in the embodiment of fig. 5. The first switch assembly 601 of the present embodiment includes at least a first terminal 602 and a second terminal 603, where the first terminals 602 are connected to two ends of the batteries 104, the second terminal 603 is connected to two ends of the first mobile battery 501, and a controller (not shown) obtains a first contact 602 corresponding to a first battery to be balanced (not shown) according to position information, and connects the first terminal 602 and the second terminal 603, so that the first mobile battery 501 and the first battery to be balanced are connected.
The first equalization component 106 of the present embodiment may perform electric quantity equalization on the first to-be-equalized battery by using the method shown in fig. 7, where the method of the present embodiment includes the following steps:
s701: the controller obtains position information of the first battery to be equalized.
Since the battery pack includes a plurality of batteries connected in series, the controller acquires the position information of the first battery to be equalized when the controller acquires the first battery to be equalized. For example, each battery is correspondingly provided with a number, and the controller can obtain the position information of the first battery to be balanced according to the number, so that the controller can accurately control the first switch assembly to connect the first mobile battery with the first battery to be balanced.
S702: the controller obtains a first terminal connected with the first battery to be balanced according to the position information, controls a second terminal of the first switch assembly to be connected with the first terminal, and the second terminal is further connected with the first mobile battery.
The first switch assembly 601 includes at least a first terminal 602 and a second terminal 603, wherein the first terminals 602 are respectively connected with two ends of the batteries, and the second terminals 603 are connected with two ends of the first mobile battery 501. The controller obtains a first terminal 602 corresponding to the first battery to be balanced according to the position information, and connects the first terminal 602 and the second terminal 603, so that the first mobile battery 501 and the first battery to be balanced are connected.
The controller of the embodiment obtains the corresponding first terminal 602 according to the position information of the first battery to be balanced, so that positioning can be realized, and accuracy is improved.
Specifically, the first switch assembly 601 of the present embodiment includes at least a plurality of first terminals 602, second terminals 603, contact disks 604, and movable pointers 605, wherein the first terminals 602 and the second terminals 603 are disposed on the contact disks 604. The second terminals 603 are disposed in the middle area of the contact disc 604, that is, there are second terminals 603 at the center of the contact disc 604, and the number of the second terminals 603 may be two, and the two second terminals 603 are connected to both ends of the balancing battery, respectively. The plurality of first terminals 602 are arranged outside the middle area of the contact disc 503, i.e. the plurality of first terminals 602 are arranged along the edge of the contact disc 604. One end of the movable pointer 605 is connected to the second terminal 603, and the other end of the movable pointer 605 can be selectively connected to the first terminal 602.
If the controller determines that the power information is greater than or equal to the power information, the controller controls the other end of the movable pointer 605 to hang in the air, so that the first terminal 602 and the second terminal 603 are disconnected. Wherein, the controller controls the movable pointer 605 to be arranged at the first position, and at the moment, the other end of the movable pointer 605 is suspended. When the second terminal 603 is connected to the first terminal 602, the controller controls the movable pointer 605 to be set at a second position, wherein the first position is located above the second position.
Optionally, the first equalization assembly of this embodiment further includes a housing 502, a motor 503, a spring 504, a connector 505, a fixed plate 506, and a pawl switch 507. Wherein, movable pointer 605 is set up on fixed plate 506, and fixed plate 506 is fixed on casing 502 through the axis of rotation, and second terminal 603 sets up on the axis of rotation, and movable pointer 605's one end is connected with second terminal 603, and movable pointer 605's the other end sets up on fixed plate 506 is close to the surface of contact disc 604. The contact disc 604 is fixedly disposed at the bottom of the housing 502 and the spring 504 is disposed between the contact disc 604 and the fixed plate 506. A click switch 507 is provided on a side wall of the housing 502, corresponding to the fixing plate 506, the click switch 507 being used to keep the fixing plate 506 selected in one direction and to position the fixing plate 506.
The motor 503 is arranged above the contact disc 604, the first mobile battery 501 is arranged inside the housing 502, and the first mobile battery 501 is located above the motor 503 for powering the motor 503. The controller and monitor may further be provided with a motor 503, and the motor 503 is connected to the controller, and the controller is used for controlling the motor 503 to work. In other embodiments, the controller and monitor may also be disposed outside of the housing 502, which is not described in detail herein. The rotating rod of the motor 503 is connected to the connecting member 505, and when the motor 503 operates, the connecting member 505 is driven to rotate.
When the controller determines that the electric quantity information is greater than or equal to the first electric quantity information, that is, the batteries do not need to be balanced, the motor 503 stops working, at this time, the connecting piece 505 is separated from the fixed plate 506, the fixed plate 506 is separated from the contact disc 604 by a certain distance under the action of the spring 504, the movable pointer 605 is arranged at the second position, and the other end of the movable pointer 605 located at the fixed plate 506 is suspended, so that the first terminal 602 and the second terminal 603 are disconnected.
When the controller judges that the electric quantity information is smaller than the first electric quantity information, the controller controls the motor 503 to work, the connecting piece 505 is connected with the fixed plate 506 under the action of the motor 503 to drive the fixed plate 506 to rotate, and the other end of the movable pointer 605 is rotated to the position above the first terminal of the first battery to be balanced according to the position information. The controller further pushes the connecting member 505 and the fixed plate 506, and the movable pointer 605 is disposed at the first position, so that the other end of the movable pointer 605 located at the fixed plate 506 abuts against the first terminal, thereby realizing the connection between the first mobile battery 501 and the first battery to be balanced.
The embodiment has simple structure and small volume, can realize that the movable pointer 605 is not dragged to connect the terminal corresponding to the first battery to be balanced on the contact disc 604 while ensuring the balance performance of the battery, avoids multiple friction of the movable pointer 605 when selecting the terminal, and further improves the service life of the movable pointer 605.
Further, the first equalization module of this embodiment further includes a socket 508 for plugging the first equalization module with other equalization modules.
Wherein the first terminal, the second terminal and the number of the movable pointers 605 are arranged in one-to-one correspondence. For example, two first terminals are respectively connected to both ends of the first battery to be balanced, corresponding two second terminals are respectively connected to both ends of the first mobile battery 501, and the fixed plate 506 is provided with two movable pointers 605.
The number of the movable pointers 605 in this embodiment is 1, and in other embodiments, the number of movable pointers is not limited and may be greater than or equal to 2.
The second equalization assembly comprises a second mobile battery and a second switch assembly, one end of the second switch assembly is connected with the second mobile battery, and the other end of the second switch assembly is connected with the battery.
The present application further proposes a first equalization assembly of a third embodiment, as shown in fig. 8A-8D, fig. 8A being a schematic structural view of the third embodiment of the first equalization assembly in a battery equalization device of the present application having a plurality of mobile batteries; FIG. 8B is a schematic illustration of the specific configuration of the contact disc of the embodiment of FIG. 8A; FIG. 8C is a schematic view of the structure of the fixing plate in the embodiment of FIG. 8A; FIG. 8D is a schematic view of the specific structure of the connector of the embodiment of FIG. 8A and FIG. 8E is a left side view of the connector of the embodiment of FIG. 8C; FIG. 8F is a front view of the connector of the embodiment of FIG. 8C; fig. 8G is a schematic diagram of the connection of the motorized battery to the battery pack in the embodiment of fig. 8A. The first equalization component 801 of the present embodiment includes: a first motorized battery, a housing 812, a battery compartment 802, a motor 813, a connector 808, a securing plate 806, a contact disc 804, and a pawl 814.
The battery compartment 802 is configured to house a first mobile battery 817, the motor 813 is connected to the connector 808 through a connecting rod 815, and an inclined contact 809 is disposed on a side of the connector 808 away from the motor 813. The bottom of the housing 812 is provided with a limiting shaft (not shown), a spring 811 is sleeved on the limiting shaft, and the fixing plate 806 is arranged on the limiting shaft and can move along the limiting shaft; the fixing plate 806 is provided with a through hole 807, and the through hole 807 can be used for accommodating the inclined contact pin 809; the side of the fixing plate 806 away from the connection member 808 is provided with a spring 810.
The contact disc 804 is provided with a plurality of contacts 805 and a plurality of pins 816, each pin 816 may be welded to the contact disc 804, and each contact 805 is connected to a corresponding pin 816, and the spring 810 is used to connect to a corresponding contact 805; a pawl 814 is provided on a side wall of the housing 812, corresponding to the fixing plate 806, and the pawl 814 is used to position the fixing plate 806.
The inclined contact pin 809 of the present embodiment includes a first inclined contact pin 8091 and a second inclined contact pin 8092, and the first inclined contact pin 8091 and the second inclined contact pin 8092 are both trapezoidal, which can reduce friction when the inclined contact pin 809 passes in and out of the through hole 807.
When the battery balancing device 801 balances the battery 818 to be balanced through the motor battery 817, the motor 813 drives the connecting piece 808 to rotate through the connecting rod, and then the inclined contact pin 809 rotates, the inclined contact pin 809 is abutted on the fixed plate 806, and a certain pressure is applied to the fixed plate 806, so that the fixed plate 806 is pressed down and the gap distance between the fixed plate 806 and the contact disc 804 is reduced, and the elastic piece 810 is in contact with the contact 805 of the contact disc 804. The spring plate 810 includes a first spring plate 8101 and a second spring plate 8102, the negative electrode of the mobile battery 817 contacts with the first spring plate 8101, the contact 805 of the mobile battery 817 contacts with the negative electrode of the battery 818 to be balanced through the corresponding pin 816, the contact 805 of the mobile battery 817 contacts with the positive electrode of the battery 818 to be balanced through the corresponding pin 816, and the mobile battery 817 is connected with the battery 818 to be balanced in parallel.
When the equalization of the battery 818 is completed, the motor 813 drives the connecting piece 808 to drive the inclined contact pin 809 to rotate, the inclined contact pin 809 slides into the through hole 807, the spring 811 jacks up the fixing plate 806, at this time, a certain gap exists between the fixing plate 806 and the contact disc 804, the elastic piece 810 is disconnected from the contact 805 of the contact disc 804, and at this time, the battery is charged and discharged normally.
The battery pack of this embodiment is provided with a socket 803 for connection of the lead pin 816 to the battery to be equalized.
In this embodiment, the lifting and rotating positioning of the fixing plate 806 can be realized through the inclined contact pins 809.
Further, the present embodiment further includes a socket 819 for plugging the first equalization component 801 with other equalization components.
Further, the present embodiment may detect the access position of the mobile battery 817 by a photoelectric sensor or the like, and in particular, may acquire the access position of the mobile battery 817 by detecting a voltage difference between the negative electrode of the mobile battery 817 and the negative electrode of the first battery of the battery pack; meanwhile, the position of the contact disc 804 corresponding to the spring 810 can also be obtained by detecting the gear position of the pawl 814 by a photoelectric sensor or the like.
The specific structure and the equalization method of the second equalization component are the same as those of the first equalization component, and are not repeated.
The present application further provides a battery balancing apparatus of a fourth embodiment, as shown in fig. 9, which is described on the basis of the above embodiment, in which a first balancing component 902 and a second balancing component 903 of a battery balancing apparatus 901 of a plurality of mobile batteries are stacked, and a first terminal 905 of a first switching component 904 is disposed corresponding to a plurality of first terminals 907 of a second switching component 906.
Specifically, the first terminal 905 of the first switching component 904 may be correspondingly connected with the plurality of first terminals 907 of the second switching component 906 through an internal line within the second equalizing component 903.
When the controller 908 determines that there are a plurality of batteries to be balanced, the first balancing component 902 may be controlled to perform electric quantity balancing on a part of the batteries to be balanced, and the second balancing component 903 may be controlled to perform electric quantity balancing on another part of the batteries to be balanced.
Specifically, the controller 908 may perform time-sharing control or simultaneous control on the first switch component 904 and the second switch component 906. For example, when the controller performs time-sharing control on the first switch assembly 904 and the second switch assembly 906, the fixed plate of the first switch assembly 904 may be controlled to rotate so that the second terminal of the first switch assembly 904 is connected to the first terminals located in the region a and the region B, so that the first mobile battery equalizes the batteries corresponding to the region a and the region B in the battery pack, and the fixed plate of the second switch assembly 906 may be controlled to rotate so that the second terminal of the second switch assembly 906 is connected to the first terminals located in the region C and the region D, so that the first mobile battery equalizes the batteries corresponding to the region D and the region D in the battery pack.
In this way, it is possible to perform charge equalization for a plurality of batteries when cracking of the battery pack is serious.
In an embodiment, the power of the mobile batteries in different equalization components may be different, the monitor may detect a specific power of each battery to be equalized, and the controller may select a mobile battery matched with the power to perform power equalization according to the specific power of each battery to be equalized. By the method, not only can a better equalization effect be achieved, but also the equalization efficiency of the whole battery pack can be improved.
The specific equalization process of the battery to be equalized by the equalization component has been described in the above embodiments, and is not repeated here.
In one embodiment, the switch assemblies of the plurality of equalization assemblies may share a contact disc.
The application further provides a battery equalization apparatus of the fifth embodiment, as shown in fig. 10, the first switch assembly 1001 of the present embodiment includes at least a first terminal 1002, a guide rail 1003, a second terminal 1004, and a connecting member 1005 arranged in a straight line.
Wherein, one end of the connecting piece 1005 is sleeved on the guide rail 1003, and the connecting piece 1005 can move on the guide rail 1003 through motor driving. The other end of the connector 1005 is selectively connected to the first terminal 1002, a plurality of first terminals 1002 arranged in a line are disposed parallel to the guide rails 1003, and the second terminal 1004 is further connected to one end of the connector 1005.
The first switch assembly 1001 of the present embodiment may include two connection members 1005, two first terminals 1002, and two second terminals 1004, the two second terminals 1004 being respectively connected with the two connection members 1005, and the two second terminals 1004 being respectively connected at both ends of the motor battery; two first terminals 1002 are connected to both ends of the first cell to be equalized, respectively.
The controller controls the link 1005 to move along the guide 1003 according to the position information so that the other end of the link 1005 is connected to the first terminal 1002. Wherein, the controller drives the motor according to the position information, so that the connecting piece 1005 moves along the guide rail 1003, the other end of the connecting piece 1005 is located above the first terminal 1002, and the controller further drives the motor to rotate, so that the other end of the connecting piece 1005 is connected with the first terminal 1002, the connecting piece 1005 is located at the first position, and then the first mobile battery is connected with the first battery 303 to be balanced through the connecting piece 1005.
If the controller determines that the electric quantity information is greater than or equal to the first electric quantity information, the controller controls the other end of the connecting piece to hang in the air, so that the first terminal 1002 and the second terminal 1004 are disconnected. Wherein, the controller controls the motor to control the connecting piece 1005 to rotate, the other end of the connecting piece 1005 is suspended, and the connecting piece 1005 is arranged at the second position. At this time, the other end of the connector 1005 is disconnected from the first terminal 902.
Compared with the equalizing device of the second embodiment, the equalizing device of the present embodiment has a simpler structure, is easy to implement, and saves cost.
In another embodiment, the balancing device may further include a third balancing component, where the third balancing component includes a third mobile battery, one end of the first mobile battery is connected to the first switch component, the other end of the first mobile battery is connected to the third mobile battery, and the first mobile battery and the third mobile battery perform electric quantity balancing on the first battery to be balanced in a serial manner.
The application further provides an electric vehicle, as shown in fig. 11, the electric vehicle includes a battery pack 1101 and an equalization device 1102, wherein an interface is preset above the battery pack 1101, so that the equalization device 1002 is disposed above the battery pack 1101, and the equalization device 1102 is disclosed in the above embodiment and will not be described herein.
Unlike the prior art, the battery balancing device with a plurality of motor batteries, the balancing method and the electric vehicle are disclosed, the battery balancing device is used for the electric vehicle, the electric vehicle comprises a battery pack and a battery balancing device, the battery pack comprises a plurality of batteries connected in series, and the battery balancing device at least comprises: the monitor is used for respectively acquiring the electric quantity information of the batteries; the first equalization component and the second equalization component are respectively used for equalizing electric quantity of the batteries; the controller is connected with the monitor, the first equalization circuit and the second equalization circuit respectively, and is used for acquiring a first battery to be equalized and a second battery to be equalized, of which the electric quantity information is smaller than the preset electric quantity information, according to the electric quantity information of the batteries, controlling the first equalization component to conduct electric quantity equalization on the first battery to be equalized and controlling the second equalization component to conduct electric quantity equalization on the second battery to be equalized. Through the mode, the embodiment of the application can balance the electric quantity information through at least two balance components to at least two battery packs with serious cracking, and meanwhile, the embodiment of the application can monitor the electric quantity information of the battery, and balance the electric quantity information of the battery when the electric quantity information of the battery is smaller than the preset electric quantity information, so that electric energy waste can be avoided, and the electric quantity of the original battery pack is kept.
The foregoing description is only of embodiments of the present application, and is not intended to limit the scope of the patent application, and all equivalent structures or equivalent processes using the descriptions and the contents of the present application or other related technical fields are included in the scope of the patent application.

Claims (4)

1. A battery equalization apparatus having a plurality of motorized batteries, for an electric vehicle comprising a battery pack and the battery equalization apparatus, the battery pack comprising a plurality of batteries connected in series, the battery equalization apparatus comprising at least:
the monitor is used for respectively acquiring the electric quantity information of the batteries;
the electric quantity information specifically may include at least one of a remaining electric quantity of the battery, a battery voltage, a battery output voltage, or a battery output current;
the first equalization component and the second equalization component are respectively used for equalizing electric quantity of the batteries;
the controller is respectively connected with the monitor, the first equalization component and the second equalization component, and is used for acquiring a first battery to be equalized and a second battery to be equalized, of which the electric quantity information is smaller than the preset electric quantity information, according to the electric quantity information of the battery, controlling the first equalization component to perform electric quantity information equalization on the first battery to be equalized and controlling the second equalization component to perform electric quantity information equalization on the second battery to be equalized;
the first equalization component includes: the battery compartment is used for accommodating the first mobile battery, the motor is connected with the connecting piece through a connecting rod, an inclined surface contact pin is arranged on one side, far away from the motor, of the connecting piece, a through hole is formed in the fixing plate, the through hole is used for accommodating the inclined surface contact pin, an elastic piece is arranged on one side, far away from the connecting piece, of the fixing plate, a limiting shaft is arranged at the bottom of the shell, and the fixing plate is arranged on the limiting shaft and moves along the limiting shaft; the spring is arranged between the contact disc and the fixed plate; the contact disc is provided with a plurality of contacts and a plurality of pins, each contact is connected with a corresponding pin, and the elastic sheet is connected with a corresponding contact;
when the battery balancing device balances the battery to be balanced through the mobile battery, the motor drives the connecting piece to rotate through the connecting rod, so that the inclined contact pin rotates, the inclined contact pin is abutted on the fixed plate, and a certain pressure is applied to the fixed plate, so that the fixed plate is pressed down and the clearance distance between the fixed plate and the contact disc is reduced, and the elastic sheet is contacted with the contact of the contact disc; the elastic pieces comprise a first elastic piece and a second elastic piece, the negative electrode of the mobile battery is contacted with the first elastic piece, the contact point contacted with the first elastic piece is connected with the negative electrode of the battery to be balanced through the corresponding contact pin, the contact point contacted with the second elastic piece is connected with the positive electrode of the battery to be balanced through the corresponding contact pin, and then the mobile battery is connected with the battery to be balanced in parallel, so that battery balance is realized;
when the battery to be balanced is balanced, the motor drives the connecting piece to drive the inclined plane contact pin to rotate, the inclined plane contact pin slides into the through hole, the spring jacks up the fixed plate, at the moment, a certain gap exists between the fixed plate and the contact disc, the elastic sheet is disconnected with the contact of the contact disc, and at the moment, the battery to be balanced is normally charged and discharged.
2. The battery equalization device of claim 1, wherein the first equalization assembly is provided with a first plug port and the second equalization assembly is provided with a second plug port, the first plug port being connected with the second plug port to stack the first equalization assembly with the second equalization assembly.
3. A battery equalization method for equalizing electric quantity information of a battery pack including a plurality of batteries connected in series by a battery equalization device for equalizing electric quantity of the batteries, the battery equalization method comprising:
the controller acquires the electric quantity information of the batteries through the monitor;
the controller compares the electric quantity information with preset electric quantity information to obtain a first battery to be balanced and a second battery to be balanced, wherein the electric quantity information is smaller than the preset electric quantity information;
the controller controls the first equalization component to perform electric quantity equalization on the first battery to be equalized and controls the second equalization component to perform electric quantity equalization on the second battery to be equalized;
the battery equalization apparatus includes at least:
the monitor is used for respectively acquiring the electric quantity information of the batteries;
the electric quantity information specifically may include at least one of a remaining electric quantity of the battery, a battery voltage, a battery output voltage, or a battery output current;
the first equalization component and the second equalization component are respectively used for equalizing electric quantity of the batteries;
the controller is respectively connected with the monitor, the first equalization component and the second equalization component, and is used for acquiring a first battery to be equalized and a second battery to be equalized, of which the electric quantity information is smaller than the preset electric quantity information, according to the electric quantity information of the battery, controlling the first equalization component to perform electric quantity information equalization on the first battery to be equalized and controlling the second equalization component to perform electric quantity information equalization on the second battery to be equalized;
the first equalization component includes: the battery compartment is used for accommodating the first mobile battery, the motor is connected with the connecting piece through a connecting rod, an inclined surface contact pin is arranged on one side, far away from the motor, of the connecting piece, a through hole is formed in the fixing plate, the through hole is used for accommodating the inclined surface contact pin, an elastic piece is arranged on one side, far away from the connecting piece, of the fixing plate, a limiting shaft is arranged at the bottom of the shell, and the fixing plate is arranged on the limiting shaft and moves along the limiting shaft; the spring is arranged between the contact disc and the fixed plate; the contact disc is provided with a plurality of contacts and a plurality of pins, each contact is connected with a corresponding pin, and the elastic sheet is connected with a corresponding contact;
when the battery balancing device balances the battery to be balanced through the mobile battery, the motor drives the connecting piece to rotate through the connecting rod, so that the inclined contact pin rotates, the inclined contact pin is abutted on the fixed plate, and a certain pressure is applied to the fixed plate, so that the fixed plate is pressed down and the clearance distance between the fixed plate and the contact disc is reduced, and the elastic sheet is contacted with the contact of the contact disc; the elastic pieces comprise a first elastic piece and a second elastic piece, the negative electrode of the mobile battery is contacted with the first elastic piece, the contact point contacted with the first elastic piece is connected with the negative electrode of the battery to be balanced through the corresponding contact pin, the contact point contacted with the second elastic piece is connected with the positive electrode of the battery to be balanced through the corresponding contact pin, and then the mobile battery is connected with the battery to be balanced in parallel, so that battery balance is realized;
when the battery to be balanced is balanced, the motor drives the connecting piece to drive the inclined plane contact pin to rotate, the inclined plane contact pin slides into the through hole, the spring jacks up the fixed plate, at the moment, a certain gap exists between the fixed plate and the contact disc, the elastic sheet is disconnected with the contact of the contact disc, and at the moment, the battery to be balanced is normally charged and discharged.
4. An electric vehicle characterized in that it comprises a battery pack and a battery equalization apparatus according to any one of claims 1-2.
CN201811110336.8A 2018-09-21 2018-09-21 Battery balancing device with multiple motor batteries, balancing method and electric vehicle Active CN110936853B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2054938U (en) * 1989-01-06 1990-03-21 张险峰 Non-friction contact multiple point line switch
CN2086460U (en) * 1991-01-26 1991-10-09 张裕才 Contact zero-friction multi-point circuit switching device
TW519297U (en) * 2001-09-04 2003-01-21 Wen-Jou Jian Improved structure of timer relay
WO2004036666A2 (en) * 2002-10-15 2004-04-29 Chaojiong Zhang Rotary voltage equalizer
CN102624049A (en) * 2012-03-14 2012-08-01 曹秉刚 Switching system for active equalization of battery
CN203826510U (en) * 2014-04-04 2014-09-10 淄博贝林电子有限公司 Motor-operated switch type automatic balancing battery module
CN206237157U (en) * 2016-11-08 2017-06-09 华中师范大学 Battery pack balancing device
CN108382230A (en) * 2018-02-07 2018-08-10 成都信息工程大学 The active equalization control method of power battery
CN209365944U (en) * 2018-09-21 2019-09-10 重庆广亿源电池有限公司 Battery balanced device and electric vehicle with multiple motor-driven batteries

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2054938U (en) * 1989-01-06 1990-03-21 张险峰 Non-friction contact multiple point line switch
CN2086460U (en) * 1991-01-26 1991-10-09 张裕才 Contact zero-friction multi-point circuit switching device
TW519297U (en) * 2001-09-04 2003-01-21 Wen-Jou Jian Improved structure of timer relay
WO2004036666A2 (en) * 2002-10-15 2004-04-29 Chaojiong Zhang Rotary voltage equalizer
CN102624049A (en) * 2012-03-14 2012-08-01 曹秉刚 Switching system for active equalization of battery
CN203826510U (en) * 2014-04-04 2014-09-10 淄博贝林电子有限公司 Motor-operated switch type automatic balancing battery module
CN206237157U (en) * 2016-11-08 2017-06-09 华中师范大学 Battery pack balancing device
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CN209365944U (en) * 2018-09-21 2019-09-10 重庆广亿源电池有限公司 Battery balanced device and electric vehicle with multiple motor-driven batteries

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