CN116331063B - Battery system, data measurement method thereof and vehicle - Google Patents

Battery system, data measurement method thereof and vehicle Download PDF

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Publication number
CN116331063B
CN116331063B CN202310618996.1A CN202310618996A CN116331063B CN 116331063 B CN116331063 B CN 116331063B CN 202310618996 A CN202310618996 A CN 202310618996A CN 116331063 B CN116331063 B CN 116331063B
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China
Prior art keywords
energy
cell group
battery
data
battery cell
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CN202310618996.1A
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Chinese (zh)
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CN116331063A (en
Inventor
舒伟
屈松正
董汉
陈超
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Suzhou Tsing Standard Automobile Technology Co ltd
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Suzhou Tsing Standard Automobile Technology Co ltd
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Classifications

    • 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
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • 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
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/389—Measuring internal impedance, internal conductance or related variables
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • 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
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries

Abstract

The invention provides a battery system, a data measurement method thereof and a vehicle, and relates to the technical field of power batteries; the battery cell group comprises at least two battery cells which are connected in series with each other and at least one energy consumption circuit; the energy consumption circuit of each cell group is at least connected with one target cell group in the plurality of cell groups; each energy consumption circuit is provided with a data calculation unit, and the data calculation unit is used for acquiring internal resistance data of a target cell group connected with the energy consumption circuit when the energy consumption circuit to which the data calculation unit belongs is in a working state and calculating an SOH value of the target cell group according to the internal resistance data; the battery cell group provides energy for the energy consumption circuit during energy balance, so that the energy consumption circuit is in a working state, SOH value and internal resistance data can be measured simultaneously during energy balance, energy is reasonably utilized, corresponding data are not required to be measured independently by using a special tool, and data measurement is convenient and rapid.

Description

Battery system, data measurement method thereof and vehicle
Technical Field
The present invention relates to the field of power battery technologies, and in particular, to a battery system, a data measurement method thereof, and a vehicle.
Background
The power battery is an important component of the new energy automobile, the performance of the power battery directly influences the cruising performance and driving experience of the automobile, and the parameters of the power battery are required to be measured and recorded, and the SOH value of the power battery is required to be obtained. However, when the power battery is balanced, the internal resistance is measured, and other operations need to be measured by using different instruments, so that the power battery is inconvenient.
Disclosure of Invention
In view of the above, the present invention aims to provide a battery system, a data measurement method thereof and a vehicle, which can reasonably utilize energy and measure data conveniently and rapidly.
In a first aspect, an embodiment of the present invention provides a battery system including a plurality of battery cell groups; the battery cell group comprises at least two battery cells which are connected in series with each other and at least one energy consumption circuit; the energy consumption circuit of each cell group is at least connected with one target cell group in a plurality of groups of cell groups, and the cell groups are connected with the target cell groups in parallel; each energy consumption circuit is provided with a data calculation unit, and the data calculation unit is used for acquiring internal resistance data of a target cell group connected with the energy consumption circuit when the energy consumption circuit to which the data calculation unit belongs is in a working state and calculating an SOH value of the target cell group according to the internal resistance data; the battery cell group provides energy for the energy-consuming circuit when the energy is balanced, so that the energy-consuming circuit is in a working state; energy equalization includes active equalization and passive equalization; the energy consumption circuit is in a working state in an active equalization process and/or in a passive equalization process.
With reference to the first aspect, the embodiment of the present invention provides a first possible implementation manner of the first aspect, where each cell of the cell group is connected in parallel with an equalizing sub-capacitor, and the cell group performs active equalization by consuming energy of the equalizing sub-capacitor and transferring energy of the cell.
With reference to the first aspect, the embodiment of the present invention provides a second possible implementation manner of the first aspect, where each cell of the cell group is further connected in parallel with an energy supply capacitor, and the energy supply capacitor is connected in parallel with the equalizing sub-capacitor; the energy supply capacitor is connected with the energy consumption circuit and is used for supplying energy to the energy consumption circuit so that the energy consumption circuit is in a working state.
With reference to the first aspect, the embodiment of the present invention provides a third possible implementation manner of the first aspect, where the battery cell group is configured with a switch matrix, and a plurality of switches of the switch matrix are respectively disposed on each circuit branch of the battery cell group; the switch of the switch matrix is used for closing a circuit branch corresponding to the battery cells of the battery cell group and/or balancing a circuit branch corresponding to the sub-capacitors when the energy of the battery cell group reaches a preset voltage threshold value so as to actively balance the battery cell group; the switch of the switch matrix is also used for closing a circuit branch of the energy supply capacitor and the energy consumption circuit, so that the energy supply capacitor drives the energy consumption circuit, and the data calculation unit of the energy consumption circuit configuration obtains the internal resistance data of the connected target cell group and calculates the SOH value; the switch of the switch matrix is also used for cutting off the circuit branch of the energy supply capacitor and the energy consumption circuit and/or cutting off the circuit branch corresponding to the battery core of the battery core group and the circuit branch corresponding to the equalizing sub-capacitor when the energy of the battery core group meets the preset equalizing value; the preset voltage threshold is larger than a preset equalization value; the switch of the switch matrix is also used for closing a circuit branch of the battery core and the energy supply capacitor to transfer the energy of the battery core to the energy supply capacitor when the energy of the battery core connected in parallel with the energy supply capacitor is larger than a preset balance value based on the energy difference of the energy supply capacitor relative to the balance sub-capacitor and/or the battery core; and/or closing the circuit branch of the equalization sub-capacitor and the energy supply capacitor to transfer the energy of the equalization sub-capacitor to the energy supply capacitor.
With reference to the first aspect, the embodiment of the present invention provides a fourth possible implementation manner of the first aspect, where the switches of the switch matrix are further configured to close a circuit branch of the cell and the energy dissipation circuit, and/or to equalize the sub-capacitance and the circuit branch of the energy dissipation circuit, during the energy transfer process, so that the cell and/or the equalize sub-capacitance supply power to the energy dissipation circuit.
With reference to the first aspect, an embodiment of the present invention provides a fifth possible implementation manner of the first aspect, where the equalizing sub-capacitor and the energy supply capacitor are respectively configured with a voltage stabilizing module, and the voltage stabilizing module is configured to stabilize energy output from the equalizing sub-capacitor or the energy supply capacitor, so as to make the energy consumption circuit stably work.
With reference to the first aspect, an embodiment of the present invention provides a sixth possible implementation manner of the first aspect, where the data computing unit is configured with an inverter, and an input end of the inverter is connected to an output end of the target cell group, and is configured to determine current data and voltage data of the target cell group, so that the data computing unit calculates corresponding internal resistance data according to the converted current data and voltage data; the data calculation unit comprises an information memory and a calculator, wherein the information memory is used for acquiring current data and voltage data determined by the inverter and transmitting the current data and the voltage data to the calculator; the calculator stores a preset calculation formula for calculating corresponding internal resistance data according to the current data and the voltage data, and calculating a corresponding SOH value according to the internal resistance data and the calculation formula.
With reference to the first aspect, an embodiment of the present invention provides a seventh possible implementation manner of the first aspect, wherein the battery system is further configured with a timer; the battery system is used for controlling the starting of the timer when one of the plurality of battery cell groups is in charge or energy balance; and when the timing time of the timer reaches the preset time, controlling the energy consumption circuit of the target battery cell group corresponding to the battery cell group to start, so that the data calculation unit of the target battery cell group obtains the internal resistance data of the battery cell group when the battery cell group is in charging or energy balance, and calculating the SOH value of the battery cell group.
In a second aspect, an embodiment of the present invention further provides a data measurement method of a battery system, where the method is applied to the battery system, and the method includes: acquiring internal resistance data of a target battery cell group connected with an energy consumption circuit by a data calculation unit of the battery cell group when the energy consumption circuit to which the battery cell group belongs is in a working state; calculating SOH values of the target battery cell group according to the internal resistance data through a data calculation unit; the battery cell group provides energy for the energy-consuming circuit when the energy is balanced, so that the energy-consuming circuit is in a working state; energy equalization includes active equalization and passive equalization; the energy consumption circuit is in a working state in an active equalization process and/or in a passive equalization process.
In a third aspect, an embodiment of the present invention further provides a vehicle configured with the above battery system.
The embodiment of the invention has the following beneficial effects: the invention provides a battery system, a data measurement method thereof and a vehicle, wherein the battery system comprises a plurality of groups of battery core groups, the battery core groups comprise energy consumption circuits, the energy consumption circuits are connected with at least one target battery core group of the plurality of groups of battery core groups, and when the energy consumption circuits of one group of battery core groups are in a working state, the internal resistance data of the target battery core groups can be obtained through a data calculation unit configured on the energy consumption circuits, so that an SOH value is calculated. The battery cell group provides energy for the energy consumption circuit when the energy is balanced, so that the energy consumption circuit is in a working state, SOH value and internal resistance data can be measured simultaneously in the energy balancing process, the energy is reasonably utilized, and corresponding data are not required to be measured again by using a special tool, so that the data measurement is convenient and quick.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a battery system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another battery system according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another battery system according to an embodiment of the present invention;
fig. 4 is a flowchart of a data measurement method of a battery system according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The power battery is an important component of the new energy automobile, the performance of the power battery directly influences the cruising performance and driving experience of the automobile, and the parameters of the power battery are required to be measured and recorded, and the SOH value of the power battery is required to be obtained. However, when the power battery is balanced, the internal resistance is measured, and other operations need to be measured by using different instruments, so that the power battery is inconvenient. And in the conventional passive equalization, the resistance heating causes the passive equalization to waste a large amount of energy, and the problem of heat unbalance is difficult to treat and difficult to widely use.
Based on the above, the battery system, the data measurement method thereof and the vehicle provided by the embodiment of the invention can reasonably utilize energy, and the measurement data is convenient and rapid.
For the sake of understanding the present embodiment, first, a battery system disclosed in the present embodiment of the present invention will be described in detail, fig. 1 shows a schematic structural diagram of a battery system provided in the present embodiment of the present invention, and as shown in fig. 1, the battery system includes a plurality of groups of battery cells, in fig. 1, a battery cell group 10a, a battery cell group 10b, a battery cell group 10c, and a battery cell group 10d, where the battery cell group includes at least two battery cells connected in series with each other, and, in fig. 1, the battery cell group 10a may include a battery cell 100a1, a battery cell 100a2, and a battery cell 100a3, where each battery cell is connected in series, and the number of battery cells in one battery cell group is not limited to that shown in fig. 1. Each cell group further comprises at least one energy consumption circuit, the energy consumption circuit of each cell group is at least connected with one target cell group in the multiple cell groups, in fig. 1, the cell group 10a comprises an energy consumption circuit 110a, the cell group 10b comprises an energy consumption circuit 110b, the cell group 10c comprises an energy consumption circuit 110c, and the cell group 10d comprises an energy consumption circuit 110d; the cell group is connected in parallel with the target cell group.
The battery system of the embodiment of the invention can comprise 2N groups of battery cell groups, N is a natural number integer greater than or equal to 1, every two groups of battery cell groups are mutually connected in parallel and used as a working unit, one group of battery cell group in the pair of battery cell groups can measure the SOH value of the other group of battery cell groups, and fig. 1 illustrates that every two groups of battery cell groups are mutually connected in parallel, wherein the battery cell group 10a is connected with the battery cell group 10b, and the battery cell group 10c is connected with the battery cell group 10 d. The multiple groups of battery cell groups may further include an odd number of battery cell groups, where a group of battery cell groups may be connected with any one of the multiple groups of battery cell groups according to requirements to obtain an SOH value of the target battery cell group, for example, the battery cell group 10a may be connected with any one of the battery cell groups 10b, 10c and 10d, and the battery cell groups 10b, 10c and 10d are the same.
Each energy consumption circuit is configured with a data calculation unit, such as the data calculation unit 111a, the data calculation unit 111b, the data calculation unit 111c, and the data calculation unit 111d in fig. 1, where the data calculation unit is configured to obtain internal resistance data of a target cell group connected to the energy consumption circuit when the energy consumption circuit to which the data calculation unit belongs is in a working state, and calculate an SOH value of the target cell group according to the internal resistance data. The energy consumption circuit of the battery cell group is used for acquiring internal resistance data and SOH values of the target battery cell group when the target battery cell group is not in a charging and discharging state, and one battery cell group can be connected with a plurality of target battery cell groups in a plurality of battery cell groups. Fig. 2 shows a schematic diagram of another battery system, and as shown in fig. 2, a battery cell 10a may be connected to a battery cell 10b and a battery cell 10c, and the battery cell 10c may be connected to a battery cell 10 d. Similar to the specific implementation manner corresponding to each cell group, in the embodiment of the present invention, each cell, the cell group, the data calculation unit, the energy consumption circuit, and the like in fig. 1 or fig. 2 are not labeled one by one. When one or more target cell groups of the plurality of target cell groups are not in a charging and discharging state, the data calculation unit of the cell group can acquire the internal resistance data and the SOH value of the target cell group when the energy consumption circuit is in a working state, wherein the data calculation unit can measure the cell data (the internal resistance data and the SOH value) of the target cell group under the charging and discharging or non-charging and discharging working conditions. When the energy consumption circuit is connected with a plurality of target cell groups, a number can be preset for each target cell group, and the obtained internal resistance data and SOH data are determined to be the measurement data of which target cell group according to the number.
When the battery cell group is in specific implementation, the battery cell group provides energy for the energy-consuming circuit during energy balance, so that the energy-consuming circuit is in a working state; the energy equalization comprises active equalization and passive equalization, and the energy consumption circuit is in a working state in the active equalization process and/or in the passive equalization process.
The battery cell group and the target battery cell group of the battery system are charged simultaneously, and when a battery cell reaching the maximum charge amount exists in one battery cell group, the battery cell group can start to perform energy balance, and the battery cell energy with the highest voltage is consumed. Meanwhile, the energy consumption circuit can be in a working state in the energy balance process, so that the configured data calculation unit obtains the internal resistance data of the target cell group and calculates the SOH value of the target cell group.
The battery system provided by the embodiment of the invention comprises a plurality of groups of battery cell groups, wherein each battery cell group comprises an energy consumption circuit, the energy consumption circuit is connected with at least one target battery cell group of the plurality of groups of battery cell groups, and when the energy consumption circuit of one group of battery cell groups is in a working state, the internal resistance data of the target battery cell group can be obtained through a data calculation unit configured on the energy consumption circuit, so that an SOH value is calculated. The battery cell group can provide energy for the energy consumption circuit in the energy balancing process, so that the energy consumption circuit is in a working state, at the moment, the SOH value and the internal resistance data can be measured simultaneously in the energy balancing process, the energy is reasonably utilized, and corresponding data are not required to be measured again by using a special tool, so that the data measurement is convenient and quick.
In order to facilitate understanding, the embodiment of the present invention further provides another battery system, and the other battery system provided in the embodiment of the present invention mainly introduces active equalization and passive equalization of energy equalization, and fig. 3 shows a schematic structural diagram of the other battery system provided in the embodiment of the present invention. Specifically, for each group of battery cell groups of the battery system, each battery cell of each battery cell group is respectively connected with an equalization sub-capacitor in parallel, and the battery cell groups actively equalize by consuming the energy of the equalization sub-capacitors and transferring the energy of the battery cells.
When the battery system is particularly implemented, a plurality of groups of battery cell groups of the battery system are charged simultaneously, the battery cells of some battery cell groups are charged faster, the maximum charge electric quantity is reached quickly, compared with other battery cells, the battery cell is the battery cell with the highest voltage, at the moment, the energy of the equalizing sub-capacitor of the battery cell is also the maximum, at the moment, the battery cell and related circuits are required to be disconnected, the battery cell is stopped from being charged, and the energy of the battery cell is equalized. The energy of the cell with the highest voltage can be balanced by transmitting the energy of the balancing sub-capacitor of the cell to the cells in the cell group, and the balancing process is the active balancing.
In the embodiment of the present invention, a switch matrix is configured for a battery cell group, referring to fig. 3, a plurality of switches of the switch matrix are respectively disposed on each circuit branch of the battery cell group, in fig. 3, a single switch in the switch matrix of two battery cell groups is illustrated by a switch 20a and a switch 20b, where the labels of the switches in the switch matrix are the same, and the labels of the switches in the switch matrix are not labeled one by one in fig. 3. The switch of the switch matrix is used for closing a circuit branch corresponding to the battery cell of the battery cell group and/or balancing a circuit branch corresponding to the sub-capacitor when the energy of the battery cell group reaches a preset voltage threshold, such as when the battery cell reaches the maximum charging electric quantity or when the energy of a certain battery cell is unbalanced compared with the energy of other battery cells, so that the battery cell group actively balances. The equalization sub-capacitor is used for discharging in the energy equalization process so as to consume the energy of the parallel battery cells.
In the process, the battery cell reaching the voltage threshold can transfer energy to other battery cells in the current battery cell group through the circuit branch of the battery cell so as to balance the energy. The energy of the equalization sub-capacitor connected with the battery cells in parallel can be transferred to other battery cells with lower voltages so as to perform active equalization.
Further, each cell of the cell group is also connected in parallel with an energy supply capacitor, and the energy supply capacitor is connected in parallel with the equalization sub-capacitor; the energy supply capacitor is connected with the energy consumption circuit and is used for supplying energy to the energy consumption circuit so that the energy consumption circuit is in a working state. In specific implementation, the switch of the switch matrix is further used for closing a circuit branch of the energy supply capacitor and the energy consumption circuit, so that the energy supply capacitor drives the energy consumption circuit, and the data calculation unit of the energy consumption circuit configuration obtains the internal resistance data of the connected target cell group and calculates the SOH value.
In specific implementation, the energy supply capacitor is connected with the energy consumption circuit, and the switch of the switch matrix is also arranged between the energy supply capacitor and the energy consumption circuit. The circuit branch of the energy supply capacitor and the energy consumption circuit can be closed, so that the energy of the energy supply capacitor can drive the energy consumption circuit to enable the energy consumption circuit to be in a working state, the process that the energy supply capacitor drives the energy consumption circuit is the passive equalization process, and at the moment, the data calculation unit can acquire the internal resistance data of the connected target cell group and calculate the SOH value. Further, the passive equalization can be performed simultaneously in the process of actively equalizing the energy of the battery cells, for example, the energy supply capacitor is used for driving the energy consumption circuit to perform data measurement while equalizing the energy of a plurality of battery cells of the battery cell group. The energy supply capacitor can drive the energy consumption circuit according to the data measurement requirement.
Furthermore, the embodiment of the invention can also transfer the energy of the battery core to the energy-supply capacitor capable of containing the energy, so that the energy of the battery core is balanced, and the energy-supply capacitor can drive the energy-consumption circuit by using the transferred energy after transferring the energy to the energy-supply capacitor. Specifically, the switch of the switch matrix is further used for closing a circuit branch of the battery core and the energy supply capacitor to transfer the energy of the battery core to the energy supply capacitor when the energy of the battery core connected in parallel with the energy supply capacitor is larger than a preset balance value based on the energy difference of the energy supply capacitor relative to the balance sub-capacitor and/or the battery core; and/or closing the circuit branch of the equalization sub-capacitor and the energy supply capacitor to transfer the energy of the equalization sub-capacitor to the energy supply capacitor.
In the specific implementation, in the process that the energy supply capacitor drives the energy consumption circuit, as the energy consumption circuit is configured with operation components such as a data calculation unit, the situation that the energy consumption of the energy supply capacitor is too fast possibly occurs, at this time, an energy difference exists between the equalization sub-capacitor of the battery core with higher voltage and the energy supply capacitor, if the energy of the battery core is still larger than the equalization value, the energy of the battery core or the energy of the equalization sub-capacitor can be transferred to the energy supply capacitor, and the process can not only accelerate the energy equalization efficiency, but also ensure the energy of the energy consumption circuit. The equalization value may be set based on the charge amount of the battery cells, or may be determined based on the energy compared to other battery cells in the battery cell group. The transfer process can transfer the energy of the battery core when active equalization is started and passive equalization is not started, namely, the energy of the battery core or the equalization sub-capacitor is transferred to the energy supply capacitor when the energy supply capacitor does not drive the energy consumption circuit.
Further, when the voltage (energy) of the battery cells in the battery cell group reaches the highest, the switch matrix can be directly operated, so that the battery cells supply power to the energy consumption circuit, and the effect of passive equalization is achieved; in a specific implementation, the switches of the switch matrix are further used for closing circuit branches of the battery core and the energy consumption circuit and/or balancing sub-capacitors and circuit branches of the energy consumption circuit in the energy transfer process, so that the battery core and/or balancing sub-capacitors supply power to the energy consumption circuit. That is, the energy-consuming circuit can be powered not only by the energy-supplying capacitor, but also by the cell or the equalization sub-capacitor, and the process of the cell powering the energy-consuming circuit is a standard passive equalization process. In addition, when the energy balance is carried out on the battery cells, if the energy of one battery cell reaches the balance, the switch of the switch matrix is automatically opened, and the energy balance is stopped to be continuously carried out on the battery cells.
Specifically, referring to fig. 3, fig. 3 illustrates a cell group 10a and a cell group 10b, which include a cell 100a1 and a cell 100b1, respectively. In fig. 3, the dc power supply is connected in parallel with the two sets of battery cells, and each battery cell of each set of battery cells is connected in parallel with two sets of capacitors, wherein one set of capacitors close to the battery cell is the equalizing sub-capacitor, and the other set of capacitors is the energy supply capacitor. For a description of a single cell, referring to fig. 3, a single cell in a group of cells is connected in parallel with an equalizer capacitor 200a and an energy supply capacitor 201a, and other cells in the group of cells are similar to the cells described above, and the equalizer capacitor and the energy supply capacitor are labeled similarly, not labeled one by one in fig. 3, and in addition, another group of cells in fig. 3 is also labeled similarly to the above, and two groups of capacitors of a single cell are respectively illustrated with an equalizer capacitor 200b and an energy supply capacitor 201 b.
In addition, the switch of the switch matrix is also used for cutting off the circuit branch of the energy supply capacitor and the energy consumption circuit when the energy of the battery cell group meets the preset balance value, and/or cutting off the circuit branch corresponding to the battery cell of the battery cell group and the circuit branch corresponding to the balance sub-capacitor. When the battery cell with the highest voltage in the battery cell group is balanced to a certain degree, the battery cell group can be understood that the energy of the battery cell group is in an balanced state, active balancing or passive balancing is not needed at this time, and the corresponding circuit branch can be cut off through the switch matrix, so that the energy balancing is stopped. When the internal resistance data and the SOH value need to be measured, the energy of the energy supply capacitor can be continuously utilized to drive the energy consumption circuit, and the data measurement time is not limited.
When the battery cell groups are in specific implementation, the two battery cell groups are connected in parallel, when the battery cell groups are charged for a certain time, the battery cell groups can be balanced, the two battery cell groups are in a power-off state through adjusting the switch matrix, and the balance sub-capacitor connected in parallel with the highest voltage battery cell in the battery cell group to be balanced is adjusted to actively balance the other battery cells in the current battery cell group. The highest voltage battery core or a plurality of battery cores with higher voltages connected in series can discharge the energy consumption circuit by utilizing the energy supply capacitor, so that the process of measuring the internal resistance of the battery core is carried out on the other battery core group; after the internal resistance of one cell group is measured, the switch matrix can be adjusted to enable the functions of the two cell groups to be mutually exchanged, and the process of measuring the internal resistance of the cell is continued. When some cells of the other group of cells are not charged and balanced, the switch matrix can also be operated to enable the energy consumption circuit of the current cell group to operate so as to measure the internal resistance of the cells of the other group.
Further, in the embodiment of the invention, the battery core providing the electric energy can also measure the internal resistance of the battery core of the rest battery cores in the same battery core group, but cannot measure the internal resistance of the battery core providing the electric energy and the internal resistance of the bus where the battery core group providing the electric energy is located; and the battery cells not in the charge-discharge state can be measured for internal resistance.
The equalization sub-capacitor and the energy supply capacitor are respectively configured with a voltage stabilizing module, the voltage stabilizing modules are used for stabilizing the energy output from the equalization sub-capacitor or the energy supply capacitor so as to enable the energy consumption circuit to stably work, in fig. 3, the first group of electric core groups comprises a voltage stabilizing module 300a1 and a voltage stabilizing module 300a2, the voltage stabilizing module 300a1 is the voltage stabilizing module of the energy supply capacitor, and the voltage stabilizing module 300a2 is the voltage stabilizing module of the equalization sub-capacitor; the voltage stabilizing modules 300b1, 300b2 of the other set of cell groups are also connected to corresponding circuit branches, which are not described herein. When the energy balance circuit is particularly implemented, the energy of the capacitor is relatively unstable, and based on the energy balance circuit, the voltage stabilizing module is arranged on the circuit branch of the balance capacitor and the energy consumption circuit, and the energy of the energy consumption capacitor drives the energy consumption circuit through the voltage stabilizing module in the process of supplying power to the energy consumption circuit by the energy supply capacitor, so that the operation of corresponding components on the energy consumption circuit is ensured, and each component can continuously operate and stably operate.
Specifically, the data calculating unit is configured with an inverter, and an input end of the inverter is connected with an output end of the target cell group, wherein the inverter is used for determining current data and voltage data of the target cell group, so that the data calculating unit calculates corresponding internal resistance data according to the current data and the voltage data. Specifically, the inverter converts direct current of a cell or a capacitor (equalizer capacitor and/or energy supply capacitor) in a cell group to which the inverter belongs into alternating current of a fixed current value, and injects the alternating current into a connected target cell group using an alternating current impedance method. Referring to fig. 3, an ammeter is further connected to the energy dissipation circuit, and each cell is connected to a corresponding voltmeter, where V-B1 in fig. 3 is a voltmeter connected to cell B1, and similarly, voltmeters V-B2, V-B3, V-B4, V-B5 are connected to corresponding cells, respectively, and will not be described herein. The ammeter is used for measuring alternating current with a fixed current value output by the inverter to obtain the current data; and the battery cells of the target battery cell group are subjected to alternating current input to generate induced voltage, and the voltmeter is used for measuring the magnitude of the induced voltage to obtain corresponding voltage data. After the corresponding alternating current input and the voltage data are obtained, the internal resistance data of the battery cells of the target battery cell group, namely the corresponding impedance of the battery cell group, can be calculated.
In specific implementation, the alternating current converted by the inverter flows through the target cell group, at this time, the alternating current is measured by the ammeter to obtain a current with a stable value, and the voltmeter measures the induced voltage generated by the cell for inputting the alternating current. The voltage measuring circuit and the alternating current input circuit can be prevented from overlapping by respectively connecting the corresponding voltmeters in parallel on each cell, and therefore measuring errors of induced voltage are reduced. In addition, the voltmeter is internally provided with a signal amplifying module and a filter which are respectively used for amplifying signals and filtering interference so as to measure the induced voltage. The induced voltage is compared with the alternating current to obtain the impedance of the battery cell, namely the measured internal resistance of the battery cell.
The data calculation unit comprises an information memory and a calculator, wherein the information memory is used for acquiring current data and voltage data determined by the inverter and transmitting the current data and the voltage data to the calculator; the calculator stores a preset calculation formula for calculating corresponding internal resistance data according to the current data and the voltage data, and calculating a corresponding SOH value according to the internal resistance data and the calculation formula.
In fig. 3, a plurality of components are provided on a circuit branch, the circuit branch is the energy consumption circuit, each component is the information memory, the calculator and the inverter, the information memory 500a, the information memory 500b, the inverter 600a and the inverter 600b are shown in fig. 3 by the calculator 400a and the calculator 400b, and the components indicated by a and b correspond to a group of battery cell groups. The input end of the inverter is connected with the output end of the battery cell group, and referring to fig. 3, the input ends of the inverters of the two battery cell groups are respectively connected with the other battery cell group. The internal resistance and SOH calculator are the above-mentioned calculator, the inverter, the information storage and the calculator are all configured on the energy consumption circuit, that is, the energy balanced on the energy consumption circuit is consumed by adding corresponding components (the inverter, the information storage and the calculator), and the corresponding internal resistance and SOH value are obtained by obtaining corresponding data, measuring the internal resistance, completing the transmission of information, the calculation of the data and the like. When the energy consumption circuit is in a working state, alternating current is output through the inverter, so that current data and voltage data of the target cell group are determined, then the calculator calculates the current data and the voltage data to obtain corresponding internal resistance data, and then an SOH value is calculated according to the internal resistance data and a preset calculation formula.
The above calculation formula includes the following formula:
R EoL an internal resistance value of the battery life end time, R BoL And R is the actual internal resistance value of the battery at the current moment. In the practical application process, the SOH of the new battery is defined as 100%, eoL reaches 0%, and a linear relationship between the increase of the internal resistance of the battery and the SOH is assumed.
In addition, the battery system is further configured with a timer (not shown in the figure), and the battery system is configured to control the timer to start when one of the plurality of battery cell groups is in charging or energy balance, and control the energy consumption circuit of the target battery cell group corresponding to the battery cell group to start when the timing time of the timer reaches a preset time, so that the data calculation unit of the target battery cell group obtains the internal resistance data of the battery cell group when the battery cell group is in charging or energy balance, and calculate the SOH value of the battery cell group. Specifically, when one group of the battery cell groups is in the charging or balancing process, the other group of the battery cell groups can be switched on and off every 15 minutes, so as to measure and calculate internal resistance of corresponding data, for example, initial internal resistance of the battery cell groups is measured, internal resistance after a period of use is measured, SOH value is obtained through calculation through the determined end-of-life internal resistance.
When the energy consumption circuit is in a working state, unnecessary components can be properly closed to ensure that the energy consumption circuit stably maintains running, for example, the inverter and the information memory can be closed to enable the calculator to be in a working state, and data calculation is kept, so that the closing sequence of the components is not sequential. In addition, when each electrical appliance in the energy consumption circuit cannot consume enough electric quantity in the energy consumption circuit, additional tasks such as calculation of SOH and some empty programs can be given to the calculator and the information storage.
The battery system provided by the embodiment of the invention can measure the internal resistance of the battery core in the power battery and calculate the SOH effect while carrying out energy balance on the battery core of the power battery. The energy consumption circuit is connected with the target cell group, the energy consumed in the energy balance process is utilized to drive the energy consumption circuit, each component in the energy consumption circuit can execute work, and then internal resistance data and SOH values of the target cell group are obtained, wherein the energy consumption circuit for measuring each data is driven by energy wasted by energy consumption, and the energy consumption circuit of the current cell group provides energy support (power supply support) for internal resistance measurement of another cell group, so that full utilization of energy is realized.
In addition, the embodiment of the invention comprises active equalization and passive equalization, wherein the energy supply capacitor is connected in parallel on the equalization sub-capacitor, the energy consumption circuit can be driven to carry out data measurement by using the method of driving the energy consumption circuit by using the energy supply capacitor, and the energy equalization effect can be enhanced. In addition, the energy of the battery core and the equalization sub-capacitor can be transferred to the energy-supplying capacitor, so that the progress of energy equalization is further accelerated. Meanwhile, the energy of the battery core, the energy of the equalizing sub-capacitor and the energy of the energy supply capacitor can drive the energy consumption circuit, so that the operation of the energy consumption circuit is ensured.
Furthermore, the embodiment of the invention is matched with the equalization sub-capacitor and the energy supply capacitor for energy equalization, so that the problems that the passive equalization of resistors is used in the prior art, a large amount of energy is wasted due to the passive equalization caused by heating of the resistors, and the heat unbalance is difficult to treat are further effectively avoided.
Further, on the basis of the above battery system embodiment, the embodiment of the invention also provides a data measurement method of the battery system, and the method is applied to the battery system. Fig. 4 shows a flowchart of a data measurement method of a battery system according to an embodiment of the present invention, as shown in fig. 4, the method includes the following steps:
step S102, when the energy consumption circuit to which the data calculation unit of the battery cell group belongs is in a working state, acquiring internal resistance data of a target battery cell group connected with the energy consumption circuit.
Step S104, calculating SOH value of the target battery cell group according to the internal resistance data by the data calculation unit.
The battery cell group provides energy for the energy-consuming circuit when the energy is balanced, so that the energy-consuming circuit is in a working state; energy equalization includes active equalization and passive equalization; the energy consumption circuit is in a working state in an active equalization process and/or in a passive equalization process.
The data measurement method of the battery system provided by the embodiment of the invention has the same technical characteristics as the battery system provided by the embodiment, so that the same technical problems can be solved, and the same technical effects can be achieved.
Further, the embodiment of the invention also provides a vehicle, which is provided with the battery system, wherein the vehicle can comprise a new energy automobile, the battery system is a power battery part in the automobile, and the battery system can measure SOH value and internal resistance data simultaneously in the energy balancing process, reasonably utilizes energy, avoids energy waste, and can quickly and conveniently acquire all the data without a plurality of instruments. Based on the method, the endurance performance and the driving experience of the automobile can be effectively ensured.
It will be clear to those skilled in the art that, for convenience and brevity of description, reference may be made to the corresponding process in the foregoing method embodiment for the specific working process of the above-described system, which is not described herein again. In addition, in the description of embodiments of the present invention, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood by those skilled in the art in specific cases.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform 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, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above examples are only specific embodiments of the present invention for illustrating the technical solution of the present invention, but not for limiting the scope of the present invention, and although the present invention has been described in detail with reference to the foregoing examples, it will be understood by those skilled in the art that the present invention is not limited thereto: any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or perform equivalent substitution of some of the technical features, while remaining within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.

Claims (8)

1. A battery system, wherein the battery system comprises a plurality of cell groups; the battery cell group comprises at least two battery cells which are connected in series with each other and at least one energy consumption circuit;
the energy consumption circuit of each cell group is at least connected with one target cell group in the multiple groups of cell groups, and the cell groups are connected with the target cell groups in parallel;
each energy consumption circuit is provided with a data calculation unit, and the data calculation unit is used for acquiring internal resistance data of a target cell group connected with the energy consumption circuit when the energy consumption circuit to which the data calculation unit belongs is in a working state, and calculating an SOH value of the target cell group according to the internal resistance data;
the energy dissipation circuit is connected with the battery cell group, and is used for dissipating energy generated by the battery cell group; the energy equalization includes active equalization and passive equalization; the energy consumption circuit is in a working state in the active equalization process and/or in the passive equalization process;
each cell of the cell group is respectively connected with an equalization sub-capacitor in parallel, and the cell group actively equalizes by consuming the energy of the equalization sub-capacitors and transferring the energy of the cells;
each cell of the cell group is also connected in parallel with an energy supply capacitor, and the energy supply capacitor is connected in parallel with the equalization sub-capacitor;
the energy supply capacitor is connected with the energy consumption circuit and is used for supplying energy to the energy consumption circuit so that the energy consumption circuit is in a working state;
the battery cell group is provided with a switch matrix, and a plurality of switches of the switch matrix are respectively arranged on each circuit branch of the battery cell group;
the switch of the switch matrix is used for closing the circuit branch of the energy supply capacitor and the energy consumption circuit, so that the energy supply capacitor drives the energy consumption circuit, and the data calculation unit of the energy consumption circuit configuration obtains the internal resistance data of the connected target battery cell group and calculates the SOH value.
2. The battery system according to claim 1, wherein the switch of the switch matrix is configured to close a circuit branch corresponding to a cell of the cell group and/or the circuit branch corresponding to the equalizing sub-capacitor when the energy of the cell group reaches a preset voltage threshold, so as to actively equalize the cell group;
the switch of the switch matrix is further used for cutting off the circuit branch of the energy supply capacitor and the energy consumption circuit when the energy of the battery cell group meets a preset balance value, and/or cutting off the circuit branch corresponding to the battery cell of the battery cell group and the circuit branch corresponding to the balance sub-capacitor;
the preset voltage threshold value is larger than the preset equalization value;
the switch of the switch matrix is further used for closing a circuit branch of the battery cell and the energy supply capacitor to transfer the energy of the battery cell to the energy supply capacitor when the energy of the battery cell connected in parallel with the energy supply capacitor is larger than a preset balance value based on the energy difference of the energy supply capacitor relative to the balance sub-capacitor and/or the battery cell;
and/or closing the circuit branches of the equalization sub-capacitor and the energy supply capacitor to transfer the energy of the equalization sub-capacitor to the energy supply capacitor.
3. The battery system according to claim 2, wherein the switches of the switch matrix are further configured to close the circuit branches of the cell and the energy consuming circuit and/or the equalizer capacitor and the circuit branches of the energy consuming circuit during the energy transfer, such that the cell and/or the equalizer capacitor power the energy consuming circuit.
4. The battery system according to claim 1, wherein the equalizing sub-capacitor and the power supply capacitor are respectively provided with a voltage stabilizing module for stabilizing energy output from the equalizing sub-capacitor or the power supply capacitor to make the energy consuming circuit operate stably.
5. The battery system according to claim 1, wherein the data calculation unit is configured with an inverter, an input terminal of which is connected to an output terminal of the target cell group, for determining current data and voltage data of the target cell group, so that the data calculation unit calculates corresponding internal resistance data from the current data and voltage data;
the data calculation unit comprises an information memory and a calculator, wherein the information memory is used for acquiring current data and voltage data determined by the inverter and transmitting the current data and the voltage data to the calculator;
the calculator is stored with a preset calculation formula, and is used for calculating corresponding internal resistance data according to the current data and the voltage data, and calculating a corresponding SOH value according to the internal resistance data and the calculation formula.
6. The battery system of claim 1, wherein the battery system is further configured with a timer;
the battery system is used for controlling the timer to start when one of the plurality of groups of battery cells is in charge or energy balance;
and when the timing time of the timer reaches the preset time, controlling the energy consumption circuit of the target battery cell group corresponding to the battery cell group to start, so that the data calculation unit of the target battery cell group obtains the internal resistance data of the battery cell group when the battery cell group is in charging or energy balance, and calculating the SOH value of the battery cell group.
7. A data measurement method of a battery system, characterized in that the method is applied to the battery system according to any one of claims 1 to 6, the method comprising:
acquiring internal resistance data of a target battery cell group connected with an energy consumption circuit when the energy consumption circuit of the battery cell group is in a working state through the data calculation unit of the battery cell group;
calculating SOH values of the target battery cell group according to the internal resistance data through the data calculation unit;
the battery cell group provides energy for the energy-consuming circuit when the energy is balanced, so that the energy-consuming circuit is in a working state; the energy equalization includes active equalization and passive equalization; the energy consumption circuit is in a working state in the active equalization process and/or in the passive equalization process.
8. A vehicle, characterized in that the vehicle is provided with a battery system according to any one of claims 1-6.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112016002067T5 (en) * 2015-06-09 2018-01-18 Scania Cv Ab Method and monitoring unit for monitoring a battery system
CN209544544U (en) * 2019-05-08 2019-10-25 深圳蓝信电气有限公司 A kind of regular active nuclei of battery group holds and repair system
CN112968502A (en) * 2021-03-31 2021-06-15 东莞新能安科技有限公司 Equalizing module, battery management system and series module energy storage system
JP2021139656A (en) * 2020-03-02 2021-09-16 株式会社デンソー Control device
CN116169752A (en) * 2023-03-03 2023-05-26 东方电气集团科学技术研究院有限公司 Equalization circuit based on resonant switch capacitor battery pack and control method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112016002067T5 (en) * 2015-06-09 2018-01-18 Scania Cv Ab Method and monitoring unit for monitoring a battery system
CN209544544U (en) * 2019-05-08 2019-10-25 深圳蓝信电气有限公司 A kind of regular active nuclei of battery group holds and repair system
JP2021139656A (en) * 2020-03-02 2021-09-16 株式会社デンソー Control device
CN112968502A (en) * 2021-03-31 2021-06-15 东莞新能安科技有限公司 Equalizing module, battery management system and series module energy storage system
CN116169752A (en) * 2023-03-03 2023-05-26 东方电气集团科学技术研究院有限公司 Equalization circuit based on resonant switch capacitor battery pack and control method thereof

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