CN113098082A - Battery system for work machine, control method, and design method - Google Patents

Battery system for work machine, control method, and design method Download PDF

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Publication number
CN113098082A
CN113098082A CN202110308250.1A CN202110308250A CN113098082A CN 113098082 A CN113098082 A CN 113098082A CN 202110308250 A CN202110308250 A CN 202110308250A CN 113098082 A CN113098082 A CN 113098082A
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CN
China
Prior art keywords
battery
series
module
voltage
modules
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Pending
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CN202110308250.1A
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Chinese (zh)
Inventor
李敏
应志伟
陈灿
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Sany Automobile Hoisting Machinery Co Ltd
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Sany Automobile Hoisting Machinery Co Ltd
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Priority to CN202110308250.1A priority Critical patent/CN113098082A/en
Publication of CN113098082A publication Critical patent/CN113098082A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0024—Parallel/serial switching of connection of batteries to charge or load circuit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • 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
    • H02J7/0042—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction
    • H02J7/0045—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction concerning the insertion or the connection of the batteries
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
    • 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
    • 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
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • 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
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles

Abstract

The invention provides a battery system of a working machine, the working machine, a control method and a design method, wherein the battery system comprises: k first battery modules including m batteries connected in series; k second battery modules including n batteries connected in series; a charging port and a discharging port; when the battery system is in a charging mode, the k first battery modules and the k second battery modules are correspondingly connected in series one by one to form k first series modules, and the k first series modules are connected into a charging port in parallel; when the battery system is in a discharging mode, the k second battery modules are connected in series to form a second series module, and the second series module and the k first battery modules are connected into a discharging port in parallel. The battery system can furthest exert the voltage platform of the charging pile and improve the charging speed on the premise of meeting the requirements of a high-voltage platform and the existing charging current limit.

Description

Battery system for work machine, control method, and design method
Technical Field
The present disclosure relates to the field of work machine technology, and more particularly, to a battery system for a work machine, a control method, and a design method.
Background
With the increasingly prominent energy and environmental problems, the operation machine begins to develop towards the trend of electromotion, and as the operation machine generally has a larger self weight, a battery with higher electric quantity needs to be matched to meet the cruising ability of the operation machine, but the problems of overlong charging time and the like are brought, so that the use experience of customers is influenced. In the prior art, the problem of overlong charging is mainly solved by walking a high-voltage platform, but the high-voltage accessory voltage platform of the whole vehicle is not matched with the voltage of a battery system.
Disclosure of Invention
The invention provides a battery system of a working machine, the working machine, a control method and a design method, which are used for solving the defect of slow charging of a battery of the working machine in the prior art and realizing high-efficiency charging.
The present invention provides a battery system for a working machine, including:
k first battery modules comprising m series-connected batteries;
k second battery modules including n series-connected batteries; a charging port and a discharging port; wherein
When the battery system is in a charging mode, the k first battery modules and the k second battery modules are connected in series in a one-to-one correspondence mode to form k first series modules, and the k first series modules are connected into the charging port in parallel;
when the battery system is in a discharging mode, the k second battery modules are connected in series to form a second series module, and the second series module and the k first battery modules are connected into the discharging port in parallel.
According to the present invention, there is provided a battery system for a working machine, further comprising:
the first switch is arranged between the first battery module and the second battery module in each first series module;
a second switch provided between the first series module and the charging port;
a third switch disposed between the first battery module and the discharge port;
a fourth switch provided between the second series module and the discharge port;
and the fifth switch is arranged between any two adjacent second battery modules in the second series module.
According to the battery system of the work machine of the present invention, the voltage of the battery in the first battery module is equal to the voltage of the battery in the second battery module, and m is equal to n.
The present invention also provides a work machine comprising: an electric motor and a battery system of a work machine as described in any one of the above.
The present invention also provides a method for controlling a battery system of a working machine according to any one of the above aspects, including:
under the condition of receiving a charging signal, controlling the k first battery modules to be connected with the k second battery modules in series in a one-to-one correspondence manner, and controlling the k first series modules to be connected into the charging port in parallel;
alternatively, the first and second electrodes may be,
and under the condition of receiving a discharging signal, controlling the k second battery modules to be connected in series to form a second series module, and controlling the second series module and the k first battery modules to be connected in parallel to the discharging port.
The present invention also provides a control device for a battery system of a working machine according to any one of the above aspects, including:
the first control module is used for controlling the k first battery modules and the k second battery modules to be connected in series in a one-to-one correspondence mode under the condition that a charging signal is received, and the k first series modules are connected into the charging port in parallel;
and the second control module is used for controlling the k second battery modules to be connected in series to form a second series module under the condition of receiving a discharging signal, and the second series module and the k first battery modules are connected in parallel to be connected into the discharging port.
The present invention also provides a method for designing a battery system for a working machine according to any one of the above, wherein the voltage of a battery in the first battery module is equal to the voltage of a battery in the second battery module, the method including:
determining m based on the voltage V1 of the discharge port and the voltage V of the battery;
determining n based on the voltage V2 of the charging port, the voltages V and m of the battery;
based on m and n, k is determined.
According to the design method provided by the invention, the method further comprises the following steps:
the determining m based on the voltage V1 of the discharge port and the voltage V of the battery comprises: applying the formula m as V1/V to determine m;
the determining n based on the voltage V2 of the charging port, the voltage V of the battery, and m comprises: applying the formula n as V2/V-m to determine n;
determining k based on m and n, comprising: k is determined using the formula k m/n.
The present invention also provides an electronic device, including a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of any of the above control methods or design methods when executing the program.
The invention also provides a non-transitory computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of any of the control methods or design methods described above.
According to the battery system, the operating machine, the control method and the design method of the operating machine, the series-parallel connection mode of the batteries in the battery system is changed, the charging speed is improved on the premise that the limitation of a high-voltage platform and the existing charging current is met, and the circuit switching function of the high-voltage platform is realized.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are 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 creative efforts.
FIG. 1 is a schematic illustration of a battery system of a work machine according to some embodiments of the present disclosure;
FIG. 2 is a schematic diagram of a control device for a work machine-based battery system according to some embodiments of the present disclosure;
FIG. 3 is a flow chart illustrating a method for designing a work machine-based battery system according to some embodiments of the present disclosure;
fig. 4 is a schematic structural diagram of an electronic device according to some embodiments of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The battery system of the working machine of the present invention is described below with reference to fig. 1.
As shown in fig. 1, a battery system of a working machine includes: k first battery modules 110, k second battery modules 120, a charge port 130, and a discharge port 140.
The first battery module 110 includes m batteries connected in series;
the second battery module 120 includes n batteries connected in series;
m, n and k are integers, and m, n and k have a quantitative relationship.
It should be noted that in this embodiment, specific values of m, n, and k are determined according to the charging pile voltages, that is, the values of m, n, and k are not fixed, but are arbitrarily switched based on different charging pile voltages.
The inventor finds that in the research and development process, in the prior art, the charging time of the working machine is shortened mainly by walking a high-voltage platform, so that the voltage platform of the high-voltage accessory of the whole vehicle is not matched with the voltage of a battery system.
In this embodiment, when the battery system is in the charging mode, the k first battery modules 110 and the k second battery modules 120 are connected in series in a one-to-one correspondence manner to form k first series modules, and the k first series modules are connected to the charging port 130 in parallel;
wherein each first series module comprises: (m + n) cells connected in series;
the positive pole of each first series module is connected with the positive pole of the charging port 130, and the negative pole of the first series module is connected with the negative pole of the charging port 130;
the voltages across each first series module are equal.
The charging port 130 is used to charge the first serial module.
When the battery system is in the discharge mode, the k second battery modules 120 are connected in series to form a second series module, and the second series module is connected in parallel with the k first battery modules 110 into the discharge port 140.
Wherein each second series module comprises: k n cells connected in series;
the positive pole of each first battery module 110 is connected with the positive pole of the discharge port 140, the negative pole is connected with the negative pole of the discharge port 140, and the positive pole of the second series module is connected with the positive pole of the discharge port 140; the negative electrode is connected with the negative electrode of the discharge port 140;
the voltage across each first battery module 110 is equal to the voltage across the second series module;
the discharge port 140 serves to discharge the electric energy stored in the first battery module 110 and the second series module.
In this embodiment, the charging port 130 may be electrically connected with the charging post;
the voltage of the charging pile is between 500-1200V, for example, the voltage of the charging pile can be 500V, or 1000V, or 1200V, etc.
With this battery system, high-voltage charging is possible without raising the charging current. Wherein: when the battery system is in a charging mode, the (m + n) batteries are connected in series to form a first series module, the k first series modules are connected in parallel to the charging port 130, and the voltage during charging is improved on the premise of the limitation of the existing charging current by increasing the number of the series batteries and reducing the number of the parallel batteries, so that the charging efficiency is improved;
when the battery system is in a discharging mode, m batteries are connected in series to form the first battery module 110, and (k +1) first battery modules 110 are connected in parallel to the discharging port 140, so that the voltage of the battery system does not affect other high-voltage accessories during discharging by reducing the number of the batteries connected in series and increasing the parallel number of circuits.
According to the battery system of the working machine provided by the embodiment of the invention, the charging speed is improved and the circuit switching function of the high-voltage platform is realized on the premise of meeting the requirements of the high-voltage platform and the existing charging current limit by changing the series-parallel connection mode of each battery in the battery system.
In some embodiments, as shown in fig. 1, the battery system of the work machine further includes: a first switch 150, a second switch 160, a third switch 170, a fourth switch 180, and a fifth switch 190.
A first switch 150 is arranged between the first battery module 110 and the second battery module 120 in each first series module;
wherein the first switch 150 is used to control the communication between the first battery module 110 and the second battery module 120.
A second switch 160 is provided between the first series module and the charging port 130;
wherein the second switch 160 is disposed between the first battery module 110 and the charging port 130, or between the second battery module 120 and the charging port 130;
the second switch 160 is used to control the communication between the first series module and the charging port 130.
A third switch 170 is provided between the first battery module 110 and the discharge port 140;
a third switch 170 is arranged between the positive electrode of the first battery module 110 and the positive electrode of the discharge port 140, and a third switch 170 is arranged between the negative electrode of the first battery module 110 and the negative electrode of the discharge port 140;
the third switch 170 is used to control communication between the first battery module 110 and the discharge port 140.
A fourth switch 180 is arranged between the second series module and the discharge port 140;
the fourth switch 180 is disposed between the positive electrode of the second series module and the positive electrode of the discharge port 140, or between the negative electrode of the second series module and the negative electrode of the discharge port 140;
fourth switch 180 is used to control communication between the second series module and discharge port 140.
A fifth switch 190 is provided between any adjacent two second battery modules 120 in the second series module.
Wherein the fifth switch 190 is used to control the communication between any adjacent two of the second battery modules 120.
The series-parallel connection structure of the battery system can be changed by controlling the opening and closing of the first switch 150, the second switch 160, the third switch 170, the fourth switch 180 and the fifth switch 190, so as to control the charging and discharging states of the battery system.
In this embodiment, the switch includes: a relay or other electronic switch.
According to some embodiments of the present invention, when the battery system is in the charging mode, the first switch 150 and the second switch 160 are closed, and the third switch 170, the fourth switch 180, and the fifth switch 190 are open;
at this time, the first battery module 110 and the second battery module 120 are connected in series to form a first series module, and k first series modules are connected in parallel to each other and connected to the charging port 130;
the voltages across the k first serial modules are equal to the voltage V2 across the charging port 130.
Each first series module comprises (m + n) batteries connected in series, the voltage across each battery is equal, the voltage across each battery is V, the sum of the voltages obtained by connecting (m + n) batteries in series is equal to the voltage across the first series module, namely:
V2＝V*(m+n)
when the battery system is in the charging mode, the charging port 130 charges the k first series modules, respectively.
According to other embodiments of the present invention, when the battery system is in the discharging mode, the first switch 150 and the second switch 160 are opened, and the third switch 170, the fourth switch 180, and the fifth switch 190 are closed;
at this time, the k first battery modules 110 are respectively connected in parallel and connected to the discharge port 140, and the k second battery modules 120 are connected in series to form a second series module and connected to the discharge port 140;
the voltage across each first battery module 110 is equal, the voltage across each first battery module 110 is equal to the voltage across the second series module and equal to the voltage V1 across the discharge port 140;
each first battery module 110 includes m batteries connected in series, the voltage across each battery is equal, the voltage of each battery is V, that is:
V1＝m*V
the second series module comprises k × n series-connected cells, the voltage at two ends of each cell is equal, the voltage of each cell is V, and the sum of the voltages obtained by connecting the k × n cells in series is equal to the voltage at two ends of the second series module, namely:
V1＝k*n*V
when the battery system is in the discharge mode, the discharge port 140 discharges the electric energy stored in the k first battery modules 110 and the second series module to the electric devices of the work machine, respectively.
The inventor found in the development process that in the conventional design, the same circuit is used in the charging and discharging processes of the circuit system, namely the circuit in the discharging state as shown in fig. 1;
in the conventional design, when the circuit is charged, m batteries are connected in series to form the first battery module 110, and (k +1) first battery modules 110 are connected in parallel to two ends of the charging port 130;
the charging time is too long due to the limitation of current wire diameter and the like;
in the present embodiment, when the circuit is charged, the (m + n) cells are connected in series to form the first series module, and the k first series modules are connected in parallel to the two ends of the charging port 130, so that the charging time is reduced by (V2-V1)/V1 compared to the charging time required in the conventional design by increasing the number of the series cells and reducing the number of the parallel cells.
According to the battery system of the working machine, the series-parallel connection mode of each battery in the battery system is controlled through the switch, and the charging and discharging modes of the battery system are further controlled, so that compared with the traditional design, the charging time of the battery circuit is reduced by (V2-V1)/V1, the charging speed is obviously improved, and the problem that the battery charging time is too long is solved.
In some embodiments, the voltage of the cells in the first battery module 110 is equal to the voltage of the cells in the second battery module 120, and m ═ n ×.k.
According to the above embodiment, when the battery system is in the discharging mode, the voltage across each first battery module 110 is equal to the voltage V1 across the discharging port 140, and V1 ═ m × V;
the voltage across the second series module is equal to the voltage V1 across the discharge port 140, V1 ═ k × n × V;
namely:
m*V＝k*n*V
and further obtaining the quantity relation among m, n and k, namely:
m＝n*k
according to the battery system of the operation machine, provided by the embodiment of the invention, the input and output voltages of the battery system can be switched at will according to the characteristics of the voltage ranges of the high-voltage accessory and the charging pile, so that the battery system can realize the switching of any voltage within the voltage range of 500-1200V, and the universality and the flexibility of the battery system are obviously improved.
The following describes a work machine provided by the present invention.
The operation machine of the embodiment of the invention can be a tower crane, an automobile crane, an excavator, a pile driver, a concrete machine, a road roller, a mixer truck, a heading machine, a pump truck or a fire fighting truck and the like.
The working machine includes: an electric motor and a battery system for a work machine as described above.
The motor is used for providing power for each operation mechanism of the operation machine;
when the battery system is in the charging mode, the working machine is electrically connected with the charging pile, and the charging port 130 is used for charging the battery system;
when the battery system is in the discharging mode, the discharging port 140 of the battery system is connected to a mechanism such as a motor or other electric device, and the discharging port 140 is used for discharging the electric energy stored in the battery system to the mechanism such as the motor or other electric device.
According to the working machine provided by the embodiment of the invention, the battery system of the working machine is arranged in the working machine, so that when charging is carried out, the (m + n) batteries are connected in series to form the first series module, and the k first series modules are connected in parallel to the charging port 130, so that the voltage platform of the charging pile is exerted to the maximum extent on the premise of meeting the limitation of a high-voltage platform and the existing charging current, and the charging speed is improved; when discharging, the m batteries are connected in series to form the first battery module 110, and the (k +1) first battery modules 110 are connected in parallel to the discharge port 140, so that the parallel number of circuits is increased, the voltage of the battery system does not influence other high-voltage accessories when discharging, and the circuit switching function of the high-voltage platform is further realized.
The following describes a method for controlling a battery system of a working machine according to the present invention, and the method for controlling a battery system of a working machine described below and the battery system of a working machine described above may be referred to in correspondence with each other.
The execution main body of the control method can be a controller on the working machine, a control device independent of the working machine, a server in communication connection with the working machine, or a terminal of an operator, and the terminal can be a mobile phone or a computer of the operator.
The battery system of the working machine includes: k first battery modules 110, the first battery modules 110 including m batteries connected in series;
k second battery modules 120, the second battery modules 120 including n batteries connected in series;
a charging port 130 and a discharging port 140;
and a first switch 150, a second switch 160, a third switch 170, a fourth switch 180, and a fifth switch 190.
In some embodiments, the control method comprises:
under the condition of receiving a charging signal, controlling the k first battery modules 110 and the k second battery modules 120 to be connected in series in a one-to-one correspondence manner, and controlling the k first series modules to be connected in parallel to the charging port 130;
wherein each first series module comprises: a first battery module 110 and a second battery module 120 connected in series;
in this embodiment, the controller controls the first switch 150 and the second switch 160 to be closed; the third switch 170, the fourth switch 180 and the fifth switch 190 are controlled to be turned off;
at this time, the battery system enters a charging state, and the charging port 130 charges each of the first series modules.
In other embodiments, the control method comprises:
and under the condition of receiving the discharge signal, controlling the k second battery modules 120 to be connected in series to form a second series module, and controlling the second series module to be connected in parallel with the k first battery modules 110 into the discharge port 140.
Wherein the voltages at the two ends of the second series module are equal to the voltages at the two ends of the first battery module 110;
in this embodiment, the controller controls the first switch 150 and the second switch 160 to be turned off; controlling the third switch 170, the fourth switch 180 and the fifth switch 190 to be closed;
at this time, the battery system enters a discharge state, and the discharge port 140 transmits the electric energy stored in the battery system to each electric device in the work machine.
According to the control method provided by the embodiment of the invention, by controlling the series-parallel connection mode among the batteries in the battery system, during charging, the (m + n) batteries are connected in series to form the first series module, and the k first series modules are connected in parallel to the charging port 130, so that the voltage platform of the charging pile is exerted to the maximum extent on the premise of meeting the limitation of a high-voltage platform and the existing charging current, and the charging speed is improved; when discharging, the m batteries are connected in series to form the first battery module 110, and the (k +1) first battery modules 110 are connected in parallel to the discharge port 140, so that the parallel number of circuits is increased, the voltage of the battery system does not influence other high-voltage accessories when discharging, and the circuit switching function of the high-voltage platform is further realized.
The control device of the battery system of the working machine according to the present invention is described below with reference to fig. 2, and the control device of the battery system of the working machine described below and the control method of the battery system of the working machine described above may be referred to in correspondence with each other.
As shown in fig. 2, the control device includes: a first control module 210 and a second control module 220.
The first control module 210 is configured to control the k first battery modules 110 to be connected in series with the k second battery modules 120 in a one-to-one correspondence manner under the condition that the charging signal is received, and the k first series modules are connected in parallel to the charging port 130;
and the second control module 220 is configured to control the k second battery modules 120 to be connected in series to form a second series module in parallel with the k first battery modules 110 and connected to the discharge port 140 when receiving the discharge signal.
According to the control device provided by the embodiment of the invention, by controlling the series-parallel connection mode among the batteries in the battery system, during charging, the (m + n) batteries are connected in series to form the first series module, and the k first series modules are connected in parallel to the charging port 130, so that the voltage platform of the charging pile is exerted to the maximum extent on the premise of meeting the limitation of a high-voltage platform and the existing charging current, and the charging speed is improved; when discharging, the m batteries are connected in series to form the first battery module 110, and the (k +1) first battery modules 110 are connected in parallel to the discharge port 140, so that the parallel number of circuits is increased, the voltage of the battery system does not influence other high-voltage accessories when discharging, and the circuit switching function of the high-voltage platform is further realized.
The following describes a method for designing a battery system of a working machine according to the present invention with reference to fig. 3, and the method for designing a battery system of a working machine described below and the battery system of a working machine described above may be referred to in correspondence with each other.
The battery system of the working machine includes: a plurality of first battery modules 110, a plurality of second battery modules 120, a charging port 130, a discharging port 140, and first, second, third, fourth, and fifth switches 150, 160, 170, 180, and 190.
The voltage of the battery in the first battery module 110 is equal to the voltage of the battery in the second battery module 120, and the voltage across each battery is V.
As shown in fig. 3, the design method includes: step 310, step 320 and step 330.
Step 310, determining m based on the voltage V1 of the discharge port 140 and the voltage V of the battery;
in this step, the battery system is in a discharge mode;
the voltage V1 across the discharge port 140 is the voltage across each first battery module 110 in the battery system;
each of the first battery modules 110 includes: a plurality of series-connected cells;
the voltage across each first battery module 110 is the sum of the voltages across the plurality of series-connected batteries;
where m is the number of batteries connected in series in each first battery module 110;
m is an integer;
from the values of V1 and V, the value of m can be determined.
Step 320, determining n based on the voltage V2 of the charging port 130, the voltage V of the battery and m;
in this step, the battery system is in a charging mode;
the voltage V2 across the charging port 130 is the voltage across each first serial module in the battery system;
each first series module comprises: a first battery module 110 and a second battery module 120 connected in series;
each of the first battery modules 110 includes: a plurality of series-connected cells;
each of the second battery modules 120 includes: a plurality of series-connected cells;
the number of the batteries connected in series in each first battery module 110 and the number of the batteries connected in series in each second battery module 120 may be equal or may not be equal;
the voltage across each first series module is: the sum of the voltages across a first battery module 110 and a second battery module 120;
the voltage across each second battery module 120 is the sum of the voltages across the plurality of series-connected batteries;
where m is the number of cells connected in series in each first battery module 110;
n is the number of cells connected in series in each second battery module 120;
m and n are integers;
m and n may be equal or may not be equal;
having determined the value of m, via step 310, then based on the values of m, V2, and V, the value of n may be determined.
Based on m and n, k is determined, step 330.
In this step, the battery system is in a discharge mode;
wherein the voltage across each first battery module 110 is equal to the voltage across the second series module;
the second series module includes: a plurality of second battery modules 120 connected in series;
wherein k is used to represent the number of the first battery modules 110 connected in parallel with the discharge port 140; or for characterizing the number of second battery modules 120 connected in series in the second series module;
k is an integer;
the values of m and n have been determined by steps 310 and 330, and then the value of k is determined based on m and n.
According to the design method provided by the embodiment of the invention, the voltages of the charging port 130 and the discharging port 140 of the battery system are determined based on the voltage range of the high-voltage accessory and the charging pile, and the serial-parallel connection number of each module in the circuit is determined based on the voltage of the charging port 130, the voltage of the discharging port 140 and the voltage of the battery, so that the voltage of the battery system can be switched arbitrarily within the voltage range of 500-1200V on the premise of meeting the limitation of a high-voltage platform and the existing charging current, the voltage platform of the charging pile is exerted to the greatest extent, and the charging speed is improved.
In some embodiments, the design method further comprises:
determining m based on the voltage V1 of the discharge port 140 and the voltage V of the battery in step 310 includes: applying the formula m as V1/V to determine m;
in this step, according to the above embodiment, when the battery system is in the discharging mode, the voltage V1 of the discharging port 140 is the voltage across each first battery module 110 in the battery system, and the voltage across each first battery module 110 is the sum of the voltages across the m batteries connected in series, that is:
V1＝m*V；
therefore, the method comprises the following steps:
m＝V1/V；
determining n based on the voltage V2 of the charging port 130, the voltage V of the battery, and m in step 320 includes: applying the formula n as V2/V-m to determine n;
in this step, according to the above embodiment, when the battery system is in the charging mode, the voltage V2 of the charging port 130 is the voltage across each first series module in the battery system, and the voltage across each first series module is: the sum of the voltages across one first battery module 110 and one second battery module 120, the voltage across each second battery module 120 being the sum of the voltages across n series-connected batteries, i.e.:
V2＝m*V+n*V
therefore, the method comprises the following steps:
n＝V2/V-m＝(V2–V1)/V；
determining k based on m and n in step 330 includes: k is determined using the formula k m/n.
In this step, according to the above embodiment, when the battery system is in the discharge mode, the k first battery modules 110 are respectively connected in parallel with the second series modules to the discharge port 140;
wherein the voltage across each first battery module 110 is equal to the voltage across the second series module;
the voltage across the second series module is the sum of the voltages across the k second battery modules 120 connected in series;
namely:
m*V＝k*n*V；
therefore, the method comprises the following steps:
k＝m/n＝V1/(V2-V1)。
according to the design method provided by the embodiment of the invention, the voltages of the charging port 130 and the discharging port 140 of the battery system are determined based on the voltage range of the high-voltage accessory and the charging pile, and the serial-parallel connection number of each module in the circuit is determined based on the voltage of the charging port 130, the voltage of the discharging port 140 and the voltage of the battery, so that the voltage of the battery system can be switched arbitrarily within the voltage range of 500-1200V on the premise of meeting the limitation of a high-voltage platform and the existing charging current, the voltage platform of the charging pile is exerted to the greatest extent, and the charging speed is improved.
Fig. 4 illustrates a physical structure diagram of an electronic device, which may include, as shown in fig. 4: a processor (processor)410, a communication Interface 420, a memory (memory)430 and a communication bus 440, wherein the processor 410, the communication Interface 420 and the memory 430 are communicated with each other via the communication bus 440. Processor 410 may invoke logic instructions in memory 430 to perform a method of controlling a battery system of any work machine based thereon, the method comprising: under the condition of receiving a charging signal, controlling the k first battery modules to be connected with the k second battery modules in series in a one-to-one correspondence manner, and controlling the k first series modules to be connected into the charging port in parallel; or, under the condition of receiving a discharge signal, controlling the k second battery modules to be connected in series to form a second series module, and controlling the second series module and the k first battery modules to be connected in parallel to the discharge port; or to implement a method of designing a battery system for a work machine based on any of the above, the method comprising: determining m based on the voltage V1 of the discharge port and the voltage V of the battery; determining n based on the voltage V2 of the charging port, the voltages V and m of the battery; based on m and n, k is determined.
In addition, the logic instructions in the memory 430 may be implemented in the form of software functional units and stored in a computer readable storage medium when the software functional units are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In another aspect, the present disclosure also provides a computer program product comprising a computer program stored on a non-transitory computer-readable storage medium, the computer program comprising program instructions that, when executed by a computer, enable the computer to perform a method of controlling a battery system of a work machine according to any one of the methods provided above, the method comprising: under the condition of receiving a charging signal, controlling the k first battery modules to be connected with the k second battery modules in series in a one-to-one correspondence manner, and controlling the k first series modules to be connected into the charging port in parallel; or, under the condition of receiving a discharge signal, controlling the k second battery modules to be connected in series to form a second series module, and controlling the second series module and the k first battery modules to be connected in parallel to the discharge port; or to implement a method of designing a battery system for a work machine based on any of the above, the method comprising: determining m based on the voltage V1 of the discharge port and the voltage V of the battery; determining n based on the voltage V2 of the charging port, the voltages V and m of the battery; based on m and n, k is determined.
In yet another aspect, the present disclosure also provides a non-transitory computer-readable storage medium having stored thereon a computer program that, when executed by a processor, implements a method of controlling a battery system of a work machine based on any one of the methods provided above, the method including: under the condition of receiving a charging signal, controlling the k first battery modules to be connected with the k second battery modules in series in a one-to-one correspondence manner, and controlling the k first series modules to be connected into the charging port in parallel; or, under the condition of receiving a discharge signal, controlling the k second battery modules to be connected in series to form a second series module, and controlling the second series module and the k first battery modules to be connected in parallel to the discharge port; or to implement a method of designing a battery system for a work machine based on any of the above, the method comprising: determining m based on the voltage V1 of the discharge port and the voltage V of the battery; determining n based on the voltage V2 of the charging port, the voltages V and m of the battery; based on m and n, k is determined.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; 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: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. A battery system for a work machine, comprising:
k first battery modules comprising m series-connected batteries;
k second battery modules including n series-connected batteries;
a charging port and a discharging port; wherein
When the battery system is in a charging mode, the k first battery modules and the k second battery modules are connected in series in a one-to-one correspondence mode to form k first series modules, and the k first series modules are connected into the charging port in parallel;
when the battery system is in a discharging mode, the k second battery modules are connected in series to form a second series module, and the second series module and the k first battery modules are connected into the discharging port in parallel.
2. The battery system of a work machine according to claim 1, further comprising:
the first switch is arranged between the first battery module and the second battery module in each first series module;
a second switch provided between the first series module and the charging port;
a third switch disposed between the first battery module and the discharge port;
a fourth switch provided between the second series module and the discharge port;
and the fifth switch is arranged between any two adjacent second battery modules in the second series module.
3. The work machine battery system of claim 1, wherein the voltage of the battery in the first battery module is equal to the voltage of the battery in the second battery module, and wherein m-n-k.
4. A work machine, characterized by comprising an electric motor and a battery system of the work machine according to any one of claims 1-3.
5. A control method of a battery system of a working machine according to any one of claims 1 to 3, comprising:
under the condition of receiving a charging signal, controlling the k first battery modules to be connected with the k second battery modules in series in a one-to-one correspondence manner, and controlling the k first series modules to be connected into the charging port in parallel;
alternatively, the first and second electrodes may be,
and under the condition of receiving a discharging signal, controlling the k second battery modules to be connected in series to form a second series module, and controlling the second series module and the k first battery modules to be connected in parallel to the discharging port.
6. A control device of a battery system of a working machine according to any one of claims 1 to 3, characterized by comprising:
the first control module is used for controlling the k first battery modules and the k second battery modules to be connected in series in a one-to-one correspondence mode under the condition that a charging signal is received, and the k first series modules are connected into the charging port in parallel;
and the second control module is used for controlling the k second battery modules to be connected in series to form a second series module under the condition of receiving a discharging signal, and the second series module and the k first battery modules are connected in parallel to be connected into the discharging port.
7. A method of designing a battery system for a working machine according to any one of claims 1 to 3, wherein the voltage of the battery in the first battery module is equal to the voltage of the battery in the second battery module, the method comprising:
determining m based on the voltage V1 of the discharge port and the voltage V of the battery;
determining n based on the voltage V2 of the charging port, the voltages V and m of the battery;
based on m and n, k is determined.
8. The design method of claim 7, comprising:
the determining m based on the voltage V1 of the discharge port and the voltage V of the battery comprises: applying the formula m as V1/V to determine m;
the determining n based on the voltage V2 of the charging port, the voltage V of the battery, and m comprises: applying the formula n as V2/V-m to determine n;
determining k based on m and n, comprising: k is determined using the formula k m/n.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the control method according to claim 5 or the design method according to any one of claims 7 to 8 when executing the program.
10. A non-transitory computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the control method according to claim 5 or the steps of the design method according to any one of claims 7 to 8.
CN202110308250.1A 2021-03-23 2021-03-23 Battery system for work machine, control method, and design method Pending CN113098082A (en)

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Publication number Priority date Publication date Assignee Title
JP2007252738A (en) * 2006-03-24 2007-10-04 Fujinon Corp Endoscopic apparatus
CN205565803U (en) * 2016-04-06 2016-09-07 李志明 Rechargeable domestic appliance operating voltage switches module
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Application publication date: 20210709