CN115015758A - Insulation test method and device of battery system and battery system - Google Patents
Insulation test method and device of battery system and battery system Download PDFInfo
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- CN115015758A CN115015758A CN202210682965.8A CN202210682965A CN115015758A CN 115015758 A CN115015758 A CN 115015758A CN 202210682965 A CN202210682965 A CN 202210682965A CN 115015758 A CN115015758 A CN 115015758A
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- 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]
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
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- 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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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- 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
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- 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]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- 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
Abstract
The application provides an insulation test method and device of a battery system and the battery system, comprising the following steps: acquiring a first bridge arm voltage value and a second bridge arm voltage value, wherein the first bridge arm voltage value is the voltage value at two ends of a first bridge arm when the first bridge arm is conducted and the second bridge arm is disconnected, and the second bridge arm voltage value is the voltage value at two ends of a second bridge arm when the second bridge arm is conducted and the first bridge arm is disconnected; and acquiring a positive bridge arm insulation resistance value and a negative bridge arm insulation resistance value of the battery system based on the first bridge arm voltage value, the second bridge arm voltage value, the first bridge arm resistance, the second bridge arm resistance, the first battery pack voltage and the second battery pack voltage. The insulation detection circuit of the system is not required to be additionally arranged, the insulation test of the battery system is completed on the basis of not increasing extra cost, and the high-voltage safety of equipment for installing the battery system is guaranteed.
Description
Technical Field
The application relates to the field of batteries, in particular to an insulation testing method and device of a battery system and the battery system.
Background
Along with the improvement of living standard of people, people's trip demand is more and more. Under the advocation of energy conservation and emission reduction, new energy transportation equipment is rapidly developed in order to meet the increasing travel demands of people. The new energy traffic comprises electric bicycles, electric motorcycles, electric automobiles and the like.
Taking an electric automobile as an example, in order to relieve the mileage anxiety of vehicle owners, the endurance mileage of the electric automobile needs to be increased, a vehicle-mounted portable battery pack can be connected in series outside a main battery pack, and the vehicle-mounted portable battery pack and the main battery pack are connected in series. In order to ensure the high-voltage safety of the whole vehicle, real-time insulation monitoring is needed to be carried out on a main battery pack and a series vehicle-mounted portable battery pack system. In particular, how to accomplish insulation monitoring becomes a problem that those skilled in the art are continuously concerned about.
Disclosure of Invention
The present application provides an insulation testing method and apparatus for a battery system, and a battery system to solve the above problems.
In order to achieve the above purpose, the embodiments of the present application employ the following technical solutions:
in a first aspect, an embodiment of the present application provides an insulation test method for a battery system, where the battery system includes a first battery pack and a second battery pack, the first battery pack is connected in series with the second battery pack, the first battery pack is configured with a first battery management device and an insulation detection circuit, the insulation detection circuit includes a first bridge arm and a second bridge arm, the first battery management device is configured to switch on/off states of the first bridge arm and the second bridge arm, and the first battery management device is further configured to collect voltages at two ends of the first bridge arm and the second bridge arm;
the method comprises the following steps:
acquiring a first bridge arm voltage value and a second bridge arm voltage value, wherein the first bridge arm voltage value is the voltage value at two ends of the first bridge arm when the first bridge arm is switched on and the second bridge arm is switched off, and the second bridge arm voltage value is the voltage value at two ends of the second bridge arm when the second bridge arm is switched on and the first bridge arm is switched off;
and acquiring a positive bridge arm insulation resistance value and a negative bridge arm insulation resistance value of the battery system based on the first bridge arm voltage value, the second bridge arm voltage value, the first bridge arm resistance, the second bridge arm resistance, the first battery pack voltage and the second battery pack voltage.
Optionally, the positive electrode of the first battery pack is connected to the negative electrode of the second battery pack, the first bridge arm resistor is a positive bridge arm resistor of the first battery pack, the first bridge arm voltage value is a positive bridge arm end voltage of the first battery pack, the second bridge arm resistor is a negative bridge arm resistor of the first battery pack, and the second bridge arm voltage value is a negative bridge arm end voltage of the first battery pack.
Optionally, the positive bridge arm insulation resistance value and the negative bridge arm insulation resistance value of the battery system are obtained according to the following formula;
rx represents the insulation resistance value of a positive bridge arm of the battery system, Ry represents the insulation resistance value of a negative bridge arm of the battery system, V1 represents the voltage of the first battery pack, V2 represents the voltage of the second battery pack, Vp represents the voltage value of the positive bridge arm of the first battery pack, Vn represents the voltage value of the negative bridge arm of the first battery pack, Rp represents the resistance of the positive bridge arm of the first battery pack, and Rn represents the resistance of the negative bridge arm of the first battery pack.
Optionally, a negative electrode of the first battery pack is connected to a positive electrode of the second battery pack, the first bridge arm resistor is a positive bridge arm resistor of the first battery pack, the first bridge arm voltage value is a positive bridge arm end voltage of the first battery pack, the second bridge arm resistor is a negative bridge arm resistor of the first battery pack, and the second bridge arm voltage value is a negative bridge arm end voltage of the first battery pack.
Optionally, the positive bridge arm insulation resistance value and the negative bridge arm insulation resistance value of the battery system are obtained according to the following formula;
rx represents the insulation resistance value of a positive bridge arm of the battery system, Ry represents the insulation resistance value of a negative bridge arm of the battery system, V1 represents the voltage of the first battery pack, V2 represents the voltage of the second battery pack, Vp represents the voltage value of the positive bridge arm of the first battery pack, Vn represents the voltage value of the negative bridge arm of the first battery pack, Rp represents the resistance of the positive bridge arm of the first battery pack, and Rn represents the resistance of the negative bridge arm of the first battery pack.
Optionally, before obtaining the first leg voltage value and the second leg voltage value, the method further includes:
and performing internal insulation detection on the first battery pack through the first battery management device and the insulation detection circuit to obtain the first bridge arm resistance and the second bridge arm resistance.
Optionally, the second battery pack includes N portable battery packs, where N is greater than or equal to 1.
In a second aspect, an embodiment of the present application provides an insulation test device for a battery system, where the battery system includes a first battery pack and a second battery pack, the first battery pack is connected in series with the second battery pack, the first battery pack is configured with a first battery management device and an insulation detection circuit, the insulation detection circuit includes a first bridge arm and a second bridge arm, the first battery management device is configured to switch on/off states of the first bridge arm and the second bridge arm, and the first battery management device is further configured to collect voltages at two ends of the first bridge arm and the second bridge arm;
the device comprises:
the monitoring unit is used for acquiring a first bridge arm voltage value and a second bridge arm voltage value, wherein the first bridge arm voltage value is the voltage value at two ends of the first bridge arm when the first bridge arm is conducted and the second bridge arm is disconnected, and the second bridge arm voltage value is the voltage value at two ends of the second bridge arm when the second bridge arm is conducted and the first bridge arm is disconnected;
and the processing unit is used for acquiring the positive bridge arm insulation resistance value and the negative bridge arm insulation resistance value of the battery system based on the first bridge arm voltage value, the second bridge arm voltage value, the first bridge arm resistance, the second bridge arm resistance, the first battery pack voltage and the second battery pack voltage.
In a third aspect, an embodiment of the present application provides a storage medium, on which a computer program is stored, and the computer program, when executed by a first battery management apparatus, implements the method described above.
In a fourth aspect, an embodiment of the present application provides a battery system, including: a memory, a first battery pack configured with a first battery management device and a second battery pack, the first battery pack and the second battery pack being connected in series, the memory for storing one or more programs; the method described above is implemented when the one or more programs are executed by the first battery management apparatus.
Compared with the prior art, the insulation test method and device for the battery system and the battery system provided by the embodiment of the application comprise the following steps: acquiring a first bridge arm voltage value and a second bridge arm voltage value, wherein the first bridge arm voltage value is the voltage value at two ends of a first bridge arm when the first bridge arm is conducted and the second bridge arm is disconnected, and the second bridge arm voltage value is the voltage value at two ends of a second bridge arm when the second bridge arm is conducted and the first bridge arm is disconnected; and acquiring a positive bridge arm insulation resistance value and a negative bridge arm insulation resistance value of the battery system based on the first bridge arm voltage value, the second bridge arm voltage value, the first bridge arm resistance, the second bridge arm resistance, the first battery pack voltage and the second battery pack voltage. The insulation detection circuit of the system is not required to be additionally arranged, the insulation test of the battery system is completed on the basis of not increasing extra cost, and the high-voltage safety of equipment for installing the battery system is guaranteed.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and it will be apparent to those skilled in the art that other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a schematic structural diagram of a battery system according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of an insulation detection circuit of a battery system according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram of an insulation detection circuit of a battery system according to an embodiment of the present disclosure;
fig. 4 is a schematic flowchart of an insulation testing method of a battery system according to an embodiment of the present disclosure;
fig. 5 is one of schematic diagrams of on-off states of a bridge arm corresponding to fig. 2 provided in an embodiment of the present application;
fig. 6 is one of schematic diagrams of on-off states of a bridge arm corresponding to fig. 2 provided in an embodiment of the present application;
fig. 7 is one of schematic diagrams of on-off states of a bridge arm corresponding to fig. 3 provided in an embodiment of the present application;
fig. 8 is one of schematic diagrams of on-off states of a bridge arm corresponding to fig. 3 provided in an embodiment of the present application;
fig. 9 is a schematic flowchart of an insulation testing method for a battery system according to an embodiment of the present disclosure;
fig. 10 is a schematic unit diagram of an insulation testing apparatus of a battery system according to an embodiment of the present disclosure;
fig. 11 is a schematic structural diagram of a battery system according to an embodiment of the present disclosure.
In the figure: 10-a first battery management device; 11-a memory; 12-a bus; 13-a communication interface; 201-a monitoring unit; 202-processing unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. 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 application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally found in use of products of the application, and are used only for convenience in describing the present application and for simplification of description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present application.
In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments and features of the embodiments described below can be combined with each other without conflict.
Taking an electric automobile as an example, in order to relieve the mileage anxiety of vehicle owners, the endurance mileage of the electric automobile needs to be increased, a vehicle-mounted portable battery pack can be connected in series outside a main battery pack, and the vehicle-mounted portable battery pack and the main battery pack are connected in series. In order to ensure the high-voltage safety of the whole vehicle, real-time insulation monitoring is needed to be carried out on a main battery pack and a series vehicle-mounted portable battery pack system. And reporting the insulation resistance value between the system high-voltage loop and the ground of the whole vehicle in time.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a battery system according to an embodiment of the present disclosure. As shown in fig. 1, the battery system includes a first battery pack ESS1 and a second battery pack ESS 2. ESS1 may be a standard on-board battery pack and ESS2 may be an optional portable battery pack.
The first battery pack ESS1 is connected in series with the second battery pack ESS 2. Optionally, the battery system further includes a Power Distribution Unit (PDU). As shown in fig. 1, the first and second battery packs ESS1 and ESS2 may be connected in series by a power distribution unit.
The P-ECU in the power distribution unit may manage the closed or open states of the switches S4, S5, and S6. Thereby realizing the connection relationship switching between the first battery pack ESS1 and the second battery pack ESS 2.
It should be appreciated that in a battery system, two battery pack devices (the first battery pack ESS1 and the second battery pack ESS 2) cannot perform insulation detection at the same time, or interfere with each other and cannot perform accurate measurement.
In the embodiment of the present application, the first battery pack ESS1 is a standard vehicle-mounted battery pack, and the BMS1 is carried to have a full function, so that insulation detection can be performed independently. And the second battery pack ESS2 is taken as an optional portable battery pack, and the portable BMS2 is not designed with an insulation detection function and cannot be subjected to insulation detection alone, but the BMS1 can perform insulation detection on the whole battery system through an ESS2 and ESS1 series system, so that the effect of saving cost can be achieved.
Specifically, the first battery pack ESS1 is configured with a first battery management device BMS1 and an insulation detection circuit, the insulation detection circuit includes a first bridge arm and a second bridge arm, the first battery management device BMS1 is configured to switch on/off states of the first bridge arm and the second bridge arm, and the first battery management device is further configured to collect voltages at two ends of the first bridge arm and the second bridge arm. Optionally, the insulation detection circuit is integrated at the PCB board end of the BMS1, belonging to the internal structure of the first battery pack ESS 1. The first battery management apparatus BMS1 may be a battery management system.
With continued reference to fig. 1, the battery system may further include switches S1-S9, where switches S1-S9 in fig. 1 refer to external relays with respect to the first and second battery packs ESS1 and ESS 2.
Referring to fig. 2 and 3, fig. 2 and 3 are schematic diagrams of an insulation detection circuit of a battery system according to an embodiment of the present disclosure. As shown in fig. 2, the positive electrode of the first battery pack ESS1 is connected in series with the negative electrode of the second battery pack ESS 2; as shown in fig. 3, the negative electrode of the first battery pack ESS1 is connected in series with the positive electrode of the second battery pack ESS 2.
Sp and Sn are relays integrated at the PCB end of BMS1 and used for switching the on-off state of the first bridge arm and the second bridge arm during auxiliary insulation detection. The first bridge arm resistance is a positive bridge arm resistance Rp of the first battery pack, the first bridge arm voltage value is a positive bridge arm end voltage of the first battery pack, the second bridge arm resistance is a negative bridge arm resistance Rn of the first battery pack, and the second bridge arm voltage value is a negative bridge arm end voltage of the first battery pack.
It should be appreciated that the first battery pack ESS1 is a standard on-board battery pack, and the onboard BMS1 is fully functional and can be individually tested for insulation, such that the positive arm resistance Rp of the first battery pack and the negative arm resistance Rn of the first battery pack can be measured. The positive arm insulation resistance value Rx of the battery system and the negative arm insulation resistance value Ry of the battery system shown in the figure are data measured for the insulation test that needs to be performed based on the BMS 1.
It should be understood that the structures shown in fig. 1, 2, and 3 are merely schematic structural views of portions of a battery system, and that the battery system may include more or fewer components than shown in fig. 1, 2, and 3, or have a different configuration than shown in fig. 1, 2, and 3. The components shown in fig. 1, 2, and 3 may be implemented in hardware, software, or a combination thereof.
The insulation testing method for a battery system provided in the embodiment of the present application can be applied to, but is not limited to, the battery systems shown in fig. 1, fig. 2, and fig. 3, and please refer to fig. 4 for a specific process, where the insulation testing method for a battery system includes: s102 and S103 are specifically set forth below.
And S102, acquiring a first bridge arm voltage value and a second bridge arm voltage value.
The first bridge arm voltage value is the voltage values of two ends of the first bridge arm when the first bridge arm is connected and the second bridge arm is disconnected, and the second bridge arm voltage value is the voltage values of two ends of the second bridge arm when the second bridge arm is connected and the first bridge arm is disconnected.
Referring to fig. 5, 6, 7, and 8, fig. 5 and 6 are schematic diagrams of an on-off state of a bridge arm corresponding to fig. 2 provided in an embodiment of the present application, and fig. 7 and 8 are schematic diagrams of an on-off state of a bridge arm corresponding to fig. 3 provided in an embodiment of the present application.
As shown in fig. 5, 6, 7, and 8, when switch Sp is closed, the first arm is on, when switch Sp is off, the first arm is off, when switch Sn is closed, the second arm is on, and when switch Sn is off, the second arm is off.
And when the switch Sp is closed and the switch Sn is opened, the voltage value Vp at the two ends of the first bridge arm is the voltage value of the first bridge arm, and when the switch Sp is opened and the switch Sn is closed, the voltage value Vn at the two ends of the second bridge arm is the voltage value of the second bridge arm.
And S103, acquiring a positive bridge arm insulation resistance value and a negative bridge arm insulation resistance value of the battery system based on the first bridge arm voltage value, the second bridge arm voltage value, the first bridge arm resistance, the second bridge arm resistance, the first battery pack voltage and the second battery pack voltage.
It should be understood that the first leg voltage value and the second leg voltage value can be obtained based on the first battery management device BMS1 and the insulation detection circuit in the first battery pack ESS1, and an additional insulation detection circuit of the system is not required. On the basis of not increasing extra cost, the positive bridge arm insulation resistance value Rx and the negative bridge arm insulation resistance value Ry of the battery system can be obtained directly on the basis of the first bridge arm voltage value, the second bridge arm voltage value, the first bridge arm resistance, the second bridge arm resistance, the first battery pack voltage and the second battery pack voltage, so that the insulation test of the battery system is completed, and the high-voltage safety of equipment for installing the battery system is guaranteed.
To sum up, the insulation test method for a battery system provided by the embodiment of the present application includes: acquiring a first bridge arm voltage value and a second bridge arm voltage value, wherein the first bridge arm voltage value is the voltage value at two ends of a first bridge arm when the first bridge arm is conducted and the second bridge arm is disconnected, and the second bridge arm voltage value is the voltage value at two ends of a second bridge arm when the second bridge arm is conducted and the first bridge arm is disconnected; and acquiring a positive bridge arm insulation resistance value and a negative bridge arm insulation resistance value of the battery system based on the first bridge arm voltage value, the second bridge arm voltage value, the first bridge arm resistance, the second bridge arm resistance, the first battery pack voltage and the second battery pack voltage. The insulation detection circuit of the system is not required to be additionally arranged, the insulation test of the battery system is completed on the basis of not increasing extra cost, and the high-voltage safety of equipment for installing the battery system is guaranteed.
Referring to fig. 2, in one possible implementation, the positive terminal of the first battery pack ESS1 is connected to the negative terminal of the second battery pack ESS2, the first bridge arm resistance is a positive bridge arm resistance Rp of the first battery pack, the first bridge arm voltage value is a positive bridge arm terminal voltage Vp of the first battery pack, the second bridge arm resistance is a negative bridge arm resistance Rn of the first battery pack, and the second bridge arm voltage value is a negative bridge arm terminal voltage Vn of the first battery pack.
Specifically, referring to fig. 5, when the switch Sp is turned off and the switch Sn is turned on, the voltage value Vn between the two ends of the second bridge arm is the second bridge arm voltage value. At this time, the voltage of the negative bridge arm of the system of the series battery system is Vn, and the voltage of the positive bridge arm of the system is V1+ V2-Vn, so that the following equation (I) is obtained:
referring to fig. 6, when the switch Sp is closed and the switch Sn is open, the voltage Vp across the first bridge arm is the first bridge arm voltage. At the moment, the voltage of the system negative bridge arm end of the series battery system is V1-Vp, the voltage of the system positive bridge arm end is V2+ Vp, and the following equation is obtained:
combining the equation I and the equation II, the positive bridge arm insulation resistance value Rx and the negative bridge arm insulation resistance value Ry can be obtained, and specifically, the positive bridge arm insulation resistance value and the negative bridge arm insulation resistance value of the battery system are obtained according to the following equations;
rx represents the insulation resistance value of a positive bridge arm of the battery system, Ry represents the insulation resistance value of a negative bridge arm of the battery system, V1 represents the voltage of a first battery pack, V2 represents the voltage of a second battery pack, Vp represents the voltage value of the positive bridge arm of the first battery pack, Vn represents the voltage value of the negative bridge arm of the first battery pack, Rp represents the resistance of the positive bridge arm of the first battery pack, and Rn represents the resistance of the negative bridge arm of the first battery pack.
Referring to fig. 3, in one possible implementation, the negative electrode of the first battery pack ESS1 is connected to the positive electrode of the second battery pack ESS2, the first bridge arm resistance is a positive bridge arm resistance Rp of the first battery pack, the first bridge arm voltage value is a positive bridge arm end voltage Vp of the first battery pack, the second bridge arm resistance is a negative bridge arm resistance Rn of the first battery pack, and the second bridge arm voltage value is a negative bridge arm end voltage Vn of the first battery pack.
Specifically, referring to fig. 7, when the switch Sp is turned off and the switch Sn is turned on, the voltage value Vn between the two ends of the second bridge arm is the second bridge arm voltage value. At this time, the voltage of the negative bridge arm end of the system of the series battery system is Vn + V2, and the voltage of the positive bridge arm end of the system is V1-Vn, so that the following equation (c) is obtained:
referring to fig. 8, when the switch Sp is closed and the switch Sn is open, the voltage Vp across the first bridge arm is the first bridge arm voltage. At the moment, the terminal voltage of a system negative bridge arm of the series battery system is V1+ V2-Vp, the voltage of a system positive bridge arm is Vp, and the following equation (four) is obtained:
combining the equation III and the equation IV, the positive bridge arm insulation resistance Rx and the negative bridge arm insulation resistance Ry can be obtained, and specifically, the positive bridge arm insulation resistance and the negative bridge arm insulation resistance of the battery system are obtained according to the following equations;
rx represents the insulation resistance value of a positive bridge arm of the battery system, Ry represents the insulation resistance value of a negative bridge arm of the battery system, V1 represents the voltage of a first battery pack, V2 represents the voltage of a second battery pack, Vp represents the voltage value of the positive bridge arm of the first battery pack, Vn represents the voltage value of the negative bridge arm of the first battery pack, Rp represents the resistance of the positive bridge arm of the first battery pack, and Rn represents the resistance of the negative bridge arm of the first battery pack.
When only the standard in-vehicle battery pack ESS1 is present and the portable battery pack ESS2 is not present, V2 is 0V, which corresponds to the point B and the point C in fig. 2, 3, 5, 6, 7, and 8 being coincident with each other, and the above Rx, Ry equation still applies.
On the basis of fig. 4, regarding how to obtain the first bridge arm resistance and the second bridge arm resistance, the embodiment of the present application further provides a possible implementation manner, please refer to fig. 9, before S102, the insulation test method of the pool system further includes: s101 is specifically described as follows.
S101, performing internal insulation detection on the first battery pack through the first battery management device and the insulation detection circuit to obtain a first bridge arm resistance and a second bridge arm resistance.
It should be appreciated that first battery pack ESS1 is a standard vehicle-mounted battery pack, and that BMS1 carried thereby is fully functional to enable individual insulation detection for first leg resistance and second leg resistance.
In one possible implementation, the second battery pack includes N portable battery packs, where N is greater than or equal to 1.
The N portable battery packs may be connected in series or in parallel, or a part of the series connection and a part of the parallel connection, which is not limited herein.
Referring to fig. 10, fig. 10 is a diagram illustrating an insulation testing apparatus of a battery system according to an embodiment of the present disclosure, where the insulation testing apparatus of the battery system is optionally applied to the battery system.
The battery system comprises a first battery pack and a second battery pack, the first battery pack and the second battery pack are connected in series, the first battery pack is provided with a first battery management device and an insulation detection circuit, the insulation detection circuit comprises a first bridge arm and a second bridge arm, the first battery management device is used for switching the on-off state of the first bridge arm and the on-off state of the second bridge arm, and the first battery management device is also used for collecting voltages at two ends of the first bridge arm and the second bridge arm;
the insulation test device of a battery system includes: a monitoring unit 201 and a processing unit 202.
The monitoring unit 201 is configured to obtain a first bridge arm voltage value and a second bridge arm voltage value, where the first bridge arm voltage value is a voltage value at two ends of the first bridge arm when the first bridge arm is turned on and the second bridge arm is turned off, and the second bridge arm voltage value is a voltage value at two ends of the second bridge arm when the second bridge arm is turned on and the first bridge arm is turned off;
the processing unit 202 is configured to obtain a positive bridge arm insulation resistance value and a negative bridge arm insulation resistance value of the battery system based on the first bridge arm voltage value, the second bridge arm voltage value, the first bridge arm resistance, the second bridge arm resistance, the first battery pack voltage, and the second battery pack voltage.
Alternatively, the monitoring unit 201 may perform S101 and S102 described above, and the processing unit 202 may perform S103 described above.
It should be noted that the insulation testing apparatus of the battery system provided in this embodiment may execute the method flows shown in the above method flow embodiments to achieve the corresponding technical effects. For the sake of brevity, the corresponding contents in the above embodiments may be referred to where not mentioned in this embodiment.
The embodiment of the application also provides a storage medium, wherein the storage medium stores computer instructions and programs, and the computer instructions and the programs execute the insulation testing method of the battery system of the embodiment when being read and run. The storage medium may include memory, flash memory, registers, or a combination thereof, etc.
A battery system is provided below, as shown in any of fig. 1, 2, and 3. The battery system includes: memory 11, first battery package and second battery package that dispose first battery management device, first battery package and second battery package series connection. The first battery management device 10 and the memory 11 are communicatively connected by a bus 12. The first battery management device 10 may be a CPU. The memory 11 is used to store one or more programs that, when executed by the first battery management apparatus 10, perform the insulation testing method of the battery system of the above-described embodiment.
Referring to fig. 11, fig. 11 is a schematic structural diagram of a battery system according to an embodiment of the present disclosure. The battery system includes a first battery management device 10, a memory 11, and a bus 12. The first battery management device 10 and the memory 11 are connected by a bus 12, and the first battery management device 10 is configured to execute an executable module, such as a computer program, stored in the memory 11.
The first battery management device 10 may be an integrated circuit chip having signal processing capability. In implementation, the steps of the insulation testing method of the battery system may be performed by an integrated logic circuit of hardware or an instruction in the form of software in the first battery management apparatus 10. The first battery management device 10 may be a general battery management system, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; the device can also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, a discrete Gate or transistor logic device, or a discrete hardware component.
The Memory 11 may include a Random Access Memory (RAM) and may also include a non-volatile Memory (non-volatile Memory).
The bus 12 may be an ISA (Industry Standard architecture) bus, a PCI (peripheral Component interconnect) bus, an EISA (extended Industry Standard architecture) bus, or the like. Only one bi-directional arrow is shown in fig. 11, but this does not indicate only one bus 12 or one type of bus 12.
The memory 11 is used for storing programs, such as programs corresponding to the insulation test device of the battery system. The insulation testing apparatus of the battery system includes at least one software functional module that may be stored in the memory 11 in the form of software or firmware (firmware) or solidified in an Operating System (OS) of the battery system. The first battery management apparatus 10, upon receiving the execution instruction, executes the program to implement the insulation test method of the battery system.
Possibly, the battery system provided by the embodiment of the present application further includes a communication interface 13. The communication interface 13 is connected to the first battery management device 10 via a bus. The communication interface 13 may be in communication connection with the vehicle control unit, and reports a detection result of the insulation test.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, each functional module in the embodiments of the present application may exist alone, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including 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 application. 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.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
It will be evident to those skilled in the art that the present application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (10)
1. The insulation test method of the battery system is characterized in that the battery system comprises a first battery pack and a second battery pack, the first battery pack and the second battery pack are connected in series, the first battery pack is provided with a first battery management device and an insulation detection circuit, the insulation detection circuit comprises a first bridge arm and a second bridge arm, the first battery management device is used for switching the on-off state of the first bridge arm and the on-off state of the second bridge arm, and the first battery management device is further used for collecting voltages at two ends of the first bridge arm and the second bridge arm;
the method comprises the following steps:
acquiring a first bridge arm voltage value and a second bridge arm voltage value, wherein the first bridge arm voltage value is the voltage value at two ends of the first bridge arm when the first bridge arm is switched on and the second bridge arm is switched off, and the second bridge arm voltage value is the voltage value at two ends of the second bridge arm when the second bridge arm is switched on and the first bridge arm is switched off;
and acquiring a positive bridge arm insulation resistance value and a negative bridge arm insulation resistance value of the battery system based on the first bridge arm voltage value, the second bridge arm voltage value, the first bridge arm resistance, the second bridge arm resistance, the first battery pack voltage and the second battery pack voltage.
2. The insulation testing method of the battery system according to claim 1, wherein a positive electrode of the first battery pack is connected to a negative electrode of the second battery pack, the first bridge arm resistance is a positive bridge arm resistance of the first battery pack, the first bridge arm voltage value is a positive bridge arm end voltage of the first battery pack, the second bridge arm resistance is a negative bridge arm resistance of the first battery pack, and the second bridge arm voltage value is a negative bridge arm end voltage of the first battery pack.
3. The insulation test method of a battery system according to claim 2, wherein the positive arm insulation resistance value and the negative arm insulation resistance value of the battery system are obtained according to the following equations;
rx represents the insulation resistance value of a positive bridge arm of the battery system, Ry represents the insulation resistance value of a negative bridge arm of the battery system, V1 represents the voltage of the first battery pack, V2 represents the voltage of the second battery pack, Vp represents the voltage value of the positive bridge arm of the first battery pack, Vn represents the voltage value of the negative bridge arm of the first battery pack, Rp represents the resistance of the positive bridge arm of the first battery pack, and Rn represents the resistance of the negative bridge arm of the first battery pack.
4. The insulation testing method of the battery system according to claim 1, wherein a negative electrode of the first battery pack is connected to a positive electrode of the second battery pack, the first bridge arm resistance is a positive bridge arm resistance of the first battery pack, the first bridge arm voltage value is a positive bridge arm end voltage of the first battery pack, the second bridge arm resistance is a negative bridge arm resistance of the first battery pack, and the second bridge arm voltage value is a negative bridge arm end voltage of the first battery pack.
5. The insulation test method of a battery system according to claim 4, wherein the positive arm insulation resistance value and the negative arm insulation resistance value of the battery system are obtained according to the following equations;
the battery pack voltage control method comprises the steps that Rx represents a positive bridge arm insulation resistance value of the battery system, Ry represents a negative bridge arm insulation resistance value of the battery system, V1 represents a first battery pack voltage, V2 represents a second battery pack voltage, Vp represents a positive bridge arm voltage value of a first battery pack, Vn represents a negative bridge arm voltage value of the first battery pack, Rp represents a positive bridge arm resistance of the first battery pack, and Rn represents a negative bridge arm resistance of the first battery pack.
6. The method for insulation testing of a battery system of claim 1, wherein prior to obtaining the first leg voltage value and the second leg voltage value, the method further comprises:
and performing internal insulation detection on the first battery pack through the first battery management device and the insulation detection circuit to obtain the first bridge arm resistance and the second bridge arm resistance.
7. The insulation test method of a battery system according to claim 1, wherein the second battery pack includes N portable battery packs, N being 1 or more.
8. An insulation test device of a battery system is characterized in that the battery system comprises a first battery pack and a second battery pack, the first battery pack is connected with the second battery pack in series, the first battery pack is provided with a first battery management device and an insulation detection circuit, the insulation detection circuit comprises a first bridge arm and a second bridge arm, the first battery management device is used for switching the on-off state of the first bridge arm and the on-off state of the second bridge arm, and the first battery management device is further used for collecting voltages at two ends of the first bridge arm and the second bridge arm;
the device comprises:
the monitoring unit is used for acquiring a first bridge arm voltage value and a second bridge arm voltage value, wherein the first bridge arm voltage value is the voltage value at two ends of the first bridge arm when the first bridge arm is conducted and the second bridge arm is disconnected, and the second bridge arm voltage value is the voltage value at two ends of the second bridge arm when the second bridge arm is conducted and the first bridge arm is disconnected;
and the processing unit is used for acquiring the positive bridge arm insulation resistance value and the negative bridge arm insulation resistance value of the battery system based on the first bridge arm voltage value, the second bridge arm voltage value, the first bridge arm resistance, the second bridge arm resistance, the first battery pack voltage and the second battery pack voltage.
9. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a first battery management apparatus, carries out the method according to any one of claims 1-7.
10. A battery system, comprising: the battery pack management system comprises a memory, a first battery pack and a second battery pack, wherein the first battery pack and the second battery pack are configured with a first battery management device and are connected in series; the memory is used for storing one or more programs; the one or more programs, when executed by the first battery management apparatus, implement the method of any of claims 1-7.
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| CN202210682965.8A CN115015758A (en) | 2022-06-16 | 2022-06-16 | Insulation test method and device of battery system and battery system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116148538A (en) * | 2023-04-19 | 2023-05-23 | 深之蓝海洋科技股份有限公司 | Direct-current high-voltage insulation detection system and detection method |
| CN116973716A (en) * | 2023-09-25 | 2023-10-31 | 宁德时代新能源科技股份有限公司 | Method and system for detecting insulation voltage resistance of battery |
| CN117686940A (en) * | 2024-02-04 | 2024-03-12 | 上海派能能源科技股份有限公司 | Fault positioning method and circuit of energy storage device |
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2022
- 2022-06-16 CN CN202210682965.8A patent/CN115015758A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116148538A (en) * | 2023-04-19 | 2023-05-23 | 深之蓝海洋科技股份有限公司 | Direct-current high-voltage insulation detection system and detection method |
| CN116973716A (en) * | 2023-09-25 | 2023-10-31 | 宁德时代新能源科技股份有限公司 | Method and system for detecting insulation voltage resistance of battery |
| CN116973716B (en) * | 2023-09-25 | 2024-02-23 | 宁德时代新能源科技股份有限公司 | Method and system for detecting insulation voltage resistance of battery |
| CN117686940A (en) * | 2024-02-04 | 2024-03-12 | 上海派能能源科技股份有限公司 | Fault positioning method and circuit of energy storage device |
| CN117686940B (en) * | 2024-02-04 | 2024-04-23 | 上海派能能源科技股份有限公司 | Fault positioning method and circuit of energy storage device |
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