Semi-physical simulation and fault simulation method for storage battery pack

Abstract

The invention relates to a semi-physical simulation and fault simulation method for a storage battery pack, and the method comprises the steps: employing a multi-channel storage battery simulator to simulate a battery monomer parallel connection block, and employing a programmable bidirectional DC source to simulate the charging and discharging power characteristics of the storage battery pack; according to real storage battery test data, obtaining a relation table between the charge state of a battery monomer parallel block in the storage battery pack under different charging and discharging currents and the voltage of the parallel block; and performing online simulation of normal performance and multiple fault modes according to the relation table of the charge state and the parallel block voltage, wherein the fault modes comprise a short-circuit fault of the single storage battery pack, an open-circuit fault of the single storage battery pack and an overcharge or overdischarge fault of the single storage battery pack. According to the invention, on-line simulation of the charging and discharging characteristics of the storage battery pack and various single fault modes is realized, and the purpose of verifying the full performance of the storage battery charging and discharging adjusting system is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of reliability of a battery pack charge and discharge regulation system and relates to a semi-physical simulation and fault simulation method for a battery pack. Background Art

[0002] At present, more than 90% of the power systems of spacecraft use solar arrays and battery pack systems. The solar arrays charge the loads and batteries in the illuminated area, and the batteries discharge to supply power to the loads in the shadowed area. As the operating conditions of spacecraft become more and more complex, the requirements for life, reliability and safety are getting higher and higher, and higher requirements are also placed on the performance of batteries. For this reason, a large number of reliability and safety designs have been carried out for the battery charge and discharge regulation system.

[0003] During the development of the charge and discharge regulation system, its performance design needs to be fully verified. However, on the one hand, it is impossible to flexibly set the real battery; secondly, some battery failure modes cannot be simulated using real batteries during the development process, which may even cause damage or danger in extreme cases. Therefore, it is often impossible to use real batteries to conduct comprehensive reliability and safety tests on the charge and discharge regulation system, and a battery simulator is usually used instead. Conventional battery simulators are composed of programmable DC power supplies, multi-channel battery simulators, and loads. The programmable DC power supply simulates the battery discharge function, the load simulates the battery charging and energy storage, and the multi-channel battery simulator simulates the single cell. These devices have scattered functions and can only simulate a single characteristic of the battery at a time, and cannot achieve comprehensive simulation of the characteristics of the battery pack and each single cell. Summary of the invention

[0004] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art, to propose a semi-physical simulation and fault simulation method for a battery pack, and to realize online simulation of the charging and discharging characteristics of the battery pack and various single-cell fault modes.

[0005] The technical solution of the present invention is: a semi-physical simulation and fault simulation method of a battery pack, comprising the following steps:

[0006] A multi-channel battery simulator is used to simulate the parallel block of battery cells, and a programmable bidirectional DC source is used to simulate the charging and discharging power characteristics of the battery pack;

[0007] According to the real battery test data, a relationship table between the state of charge and the voltage of the parallel block of battery cells in the battery pack under different charge and discharge currents is obtained;

[0008] Perform online simulation of normal performance and various failure modes:

[0009] Mode 1: Battery pack performance is normal

[0010] For a battery cell parallel block, the initial charge is SOC i , then the current charge of the multi-channel battery simulator is SOC i+1 =SOC i +∫I(t)dt / C P ×100%, I(t) is the charge and discharge current of the battery pack, C p is the rated capacity of the parallel block, according to SOC i+1 Query the relationship table between the state of charge and the parallel block voltage to obtain the output voltage Vk of the multi-channel battery simulator i ; The same method is used to obtain the output voltage of all multi-channel battery simulators and the output voltage of the programmable bidirectional DC source n is the number of battery cells connected in series in parallel;

[0011] Mode 2: Battery pack single cell short circuit fault

[0012] When a short circuit occurs in a battery cell parallel block, the battery cell parallel block outputs a constant voltage The multi-channel battery simulator outputs a constant voltage The output voltages of the remaining multi-channel battery simulators are determined in the same way as under normal performance conditions. The output voltage of the programmable bidirectional DC source

[0013] Mode 3: Battery pack single cell open circuit fault

[0014] When a single open circuit fault occurs in the battery single block, the rated capacity of the battery single block is reduced to m is the number of cells in parallel in the parallel block, l is the number of open-circuit cells, and the current charge of the multi-channel battery simulator is SOC i+1 =SOC i +∫I(t)dt / C k × 100%, according to SOC i+1 Query the relationship table between the state of charge and the parallel block voltage to obtain the output voltage Vk of the open circuit fault multi-channel battery simulator i The output voltage of the remaining multi-channel battery simulator is determined in the same way as under normal performance conditions. The output voltage of the programmable bidirectional DC source

[0015] Mode 4: Battery pack single cell overcharge or over discharge failure

[0016] When a single cell overcharge or over discharge fault occurs in the battery single cell parallel block, the initial charge of the faulty parallel block is set to SOC i ', the current charge of the multi-channel battery simulator is SOC' i+1 =SOC i '+∫I(t)dt / Cp × 100%, according to SOC' i+1 Query the relationship table between the state of charge and the parallel block voltage to obtain the output voltage Vk of the multi-channel battery simulator for overcharge or over-discharge fault i The output voltage of the remaining multi-channel battery simulator is determined in the same way as under normal performance conditions. The output voltage of the programmable bidirectional DC source

[0017] Furthermore, in mode 4, if the overcharge is a fault, the initial charge SOC of the parallel block is ' i >SOC i , corresponding to a higher single cell voltage; if over-discharged, the initial charge of the faulty parallel block SOC' i <SOC i , corresponding to a lower single cell voltage.

[0018] Furthermore, the relationship table between the state of charge and the parallel block voltage includes the following contents:

[0019] The charging or discharging current of the battery pack under different working conditions; different states of charge SOC; the voltage of the battery cell parallel block corresponding to each state of charge under the charging or discharging current of the battery pack under each working condition.

[0020] Furthermore, in mode 2, the constant voltage 0~4.2V.

[0021] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of a battery pack semi-physical simulation and fault simulation method are implemented.

[0022] An electronic device comprises a memory, a processor and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of a battery pack semi-physical simulation and fault simulation method are implemented.

[0023] A computer program product comprises a computer program, which implements the steps of a battery pack semi-physical simulation and fault simulation method when executed by a processor.

[0024] The beneficial effects of the present invention compared with the prior art are:

[0025] Compared with existing battery simulators, the battery pack semi-physical simulation and fault simulation strategy provided by the present invention can realize the comprehensive simulation of the characteristics of the battery pack and each single cell. It can not only simulate the charging and discharging process of the entire battery pack, but also simulate various fault modes of the battery single cells during the charging and discharging process, thereby achieving the purpose of full performance verification of the battery charging and discharging regulation system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is the schematic diagram of the battery semi-physical simulation and fault simulator. DETAILED DESCRIPTION

[0027] With the gradual application of bidirectional programmable DC sources, bidirectional DC sources and multi-channel battery simulators can be used to perform semi-physical simulation and fault simulation of battery packs. The present invention provides a semi-physical simulation and fault simulation method for battery packs, which can not only simulate the charging and discharging process of the entire battery pack, but also simulate various fault modes of battery cells during the charging and discharging process, thereby achieving the purpose of full performance verification of the battery charging and discharging regulation system.

[0028] The present invention will be further described below in conjunction with the embodiments.

[0029] Example 1

[0030] This embodiment proposes a battery pack semi-physical simulation and fault simulation method, which is specifically as follows:

[0031] A multi-channel battery simulator is used to simulate the battery cell parallel block, and a programmable bidirectional DC source is used to simulate the battery pack charge and discharge power characteristics. n represents the number of battery cells in series. The output voltage of the programmable bidirectional DC source is the sum of the output voltages of n multi-channel battery simulators, such as Figure 1 .

[0032] According to the actual battery test data, the relationship between the state of charge and the voltage of the parallel block of battery cells in the battery pack under different charge and discharge currents can be obtained, see Table 1. i Vk is the charging or discharging current of the battery pack under different working conditions. i is the voltage of the battery cell parallel block k at different states of charge SOC, i is the number of data samples, C p is the rated capacity of the parallel block.

[0033] Table 1 Relationship between capacity and voltage of battery cells in parallel

[0034]

[0035] Mode 1: Battery pack performance is normal

[0036] Take a battery cell parallel block as an example, the initial charge is SOC i , then the current charge of the multi-channel battery simulator is SOC i+1 =SOC i +∫I(t)dt / C P×100%, I(t) is the charge and discharge current of the battery pack, which is positive when charging the battery pack and negative when discharging. i+1 By looking up the capacity and voltage relationship table (Table 1), the output voltage Vk of the multi-channel battery simulator can be obtained. i Using the same method, the output voltages of all n multi-channel battery simulators can be obtained, and the output voltage of the programmable bidirectional DC source is

[0037] Mode 2: Battery pack single cell short circuit failure

[0038] According to the characteristics of the battery, when a benign or malignant short circuit occurs in a single cell in the battery cell parallel block, the battery cell parallel block outputs a constant voltage between 0V and 4.2V (for example, lithium-ion batteries). The multi-channel battery simulator outputs a constant voltage The output voltages of the remaining multi-channel battery simulators are determined in the same way as in the case of normal performance in mode 1. Then the output voltage of the programmable bidirectional DC source is The number of parallel blocks of battery cells that have short circuit faults can be any value between 0 and n, and generally does not exceed 2 in actual engineering applications.

[0039] Mode 3: Battery pack single cell open circuit fault

[0040] According to the battery characteristics, when a single open circuit fault occurs in a battery single block, the rated capacity of the battery single block is reduced to m is the number of cells in parallel in the parallel block, l is the number of open cells, which can be any value between 0 and m. The initial charge of the battery cell parallel block is SOC i , then the current charge of the multi-channel battery simulator is SOC i+1 =SOC i +∫I(t)dt / C k × 100%, according to SOC i+1 By looking up the capacity and voltage relationship table (Table 1), the output voltage Vk of the open circuit fault multi-channel battery simulator can be obtained. i The output voltages of the remaining multi-channel battery simulators are determined in the same way as in the case of normal performance in mode 1. Then the output voltage of the programmable bidirectional DC source is

[0041] Mode 4: Battery pack single cell overcharge or over discharge failure

[0042] According to the battery characteristics, when a single cell overcharge or over discharge fault occurs in the battery single cell parallel block, the initial charge of the faulty parallel block can be set to SOC i 'To achieve, overcharge will cause the fault parallel block initial charge SOC' i>SOC i , corresponding to a higher single cell voltage; if over-discharged, the initial charge of the faulty parallel block SOC' i <SOC i , corresponding to a lower cell voltage. The current charge of the multi-channel battery simulator is SOC' i+1 =SOC i '+∫I(t)dt / C p × 100%, according to SOC' i+1 By looking up the capacity and voltage relationship table (Table 1), the output voltage Vk of the multi-channel battery simulator for overcharge or over-discharge faults can be obtained. i The output voltage of the remaining multi-channel battery simulator is determined in the same way as in the case of normal performance in mode 1. Then the output voltage of the programmable bidirectional DC source is

[0043] The present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions. When the computer instructions are executed on a computer, the computer executes the steps of the battery pack semi-physical simulation and fault simulation method.

[0044] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) that contain computer-usable program code.

[0045] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0046] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0047] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0048] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

[0049] The contents not described in detail in the specification of the present invention belong to the common knowledge of those skilled in the art.

Claims

1. A battery pack semi-physical simulation and fault simulation method, characterized in that: The following steps are involved: A multi-channel battery simulator is used to simulate the parallel block of battery cells, and a programmable bidirectional DC source is used to simulate the charging and discharging power characteristics of the battery pack; According to the real battery test data, a relationship table between the state of charge and the voltage of the parallel block of battery cells in the battery pack under different charge and discharge currents is obtained; Perform online simulation of normal performance and various failure modes: Mode 1: Battery pack performance is normal For a battery cell parallel block, the initial charge is SOC i , then the current charge of the multi-channel battery simulator is SOC i+1 =SOC i +∫I(t)dt / C P ×100%, I(t) is the charge and discharge current of the battery pack, C p is the rated capacity of the parallel block, according to SOC i+1 Query the relationship table between the state of charge and the parallel block voltage to obtain the output voltage Vk of the multi-channel battery simulator i ; The same method is used to obtain the output voltage of all multi-channel battery simulators and the output voltage of the programmable bidirectional DC source n is the number of battery cells connected in series in parallel; Mode 2: Battery pack single cell short circuit fault When a short circuit occurs in a battery cell parallel block, the battery cell parallel block outputs a constant voltage The multi-channel battery simulator outputs a constant voltage The output voltages of the remaining multi-channel battery simulators are determined in the same way as under normal performance conditions. The output voltage of the programmable bidirectional DC source Mode 3: Battery pack single cell open circuit fault When a single open circuit fault occurs in the battery single block, the rated capacity of the battery single block is reduced to m is the number of cells in parallel in the parallel block, l is the number of open-circuit cells, and the current charge of the multi-channel battery simulator is SOC i+1 =SOC i +∫I(t)dt / C k × 100%, according to SOC i+1 Query the relationship table between the state of charge and the parallel block voltage to obtain the output voltage Vk of the open circuit fault multi-channel battery simulator i The output voltage of the remaining multi-channel battery simulator is determined in the same way as under normal performance conditions, and the output voltage of the programmable bidirectional DC source is Mode 4: Battery pack single cell overcharge or over discharge failure When a single cell overcharge or over discharge fault occurs in the battery single cell parallel block, the initial charge of the faulty parallel block is set to SOC i ', the current charge of the multi-channel battery simulator is SOC' i+1 =SOC i '+∫I(t)dt / C p × 100%, according to SOC' i+1 Query the relationship table between the state of charge and the parallel block voltage to obtain the output voltage Vk of the multi-channel battery simulator for overcharge or over-discharge fault i The output voltage of the remaining multi-channel battery simulator is determined in the same way as under normal performance conditions. The output voltage of the programmable bidirectional DC source 2. A battery pack semi-physical simulation and fault simulation method according to claim 1, characterized in that: In mode 4, if the overcharge is faulty, the initial charge SOC of the parallel block is ' i >SOC i , corresponding to a higher single cell voltage; if over-discharged, the initial charge of the faulty parallel block SOC' i <SOC i , corresponding to a lower single cell voltage.

3. A battery pack semi-physical simulation and fault simulation method according to claim 1, characterized in that: The relationship table between the state of charge and the parallel block voltage includes the following contents: The charging or discharging current of the battery pack under different working conditions; different states of charge SOC; the voltage of the battery cell parallel block corresponding to each state of charge under the charging or discharging current of the battery pack under each working condition.

4. A battery pack semi-physical simulation and fault simulation method according to claim 1, characterized in that: In mode 2, the constant voltage 0~4.2V.

5. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 4 are implemented.

6. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 4 are implemented.

7. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method described in any one of claims 1 to 4 are implemented.

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