CN116945970A

CN116945970A - Power conversion method and device between power batteries

Info

Publication number: CN116945970A
Application number: CN202311107499.1A
Authority: CN
Inventors: 李亭亭; 王楠; 吴清平
Original assignee: Neusoft Reach Automotive Technology Shenyang Co Ltd
Current assignee: Neusoft Reach Automotive Technology Shenyang Co Ltd
Priority date: 2023-08-30
Filing date: 2023-08-30
Publication date: 2023-10-27

Abstract

The application provides a power conversion method and device between power batteries. In the method, first SOC information determined by a first power battery in a first SOC determination mode and second SOC information determined by a second power battery in a second SOC determination mode are respectively acquired; based on the second SOC information, carrying out SOC conversion on the first SOC information to obtain SOC conversion information of the first power battery in a second SOC determination mode; based on the SOC conversion information and the second SOC information, determining the SOC association relationship of the first power battery and the second power battery in a second SOC determination mode; and converting the power value in the original power MAP of the first power battery by adopting the SOC association relation to obtain a new power MAP. The method realizes the power conversion of the power batteries with different SOC determination methods, and ensures that the whole vehicle can keep stable operation.

Description

Power conversion method and device between power batteries

Technical Field

The application relates to the technical field of power batteries, in particular to a power conversion method and device between power batteries.

Background

In the new energy power battery industry, a power battery is used as a main energy source of a new energy automobile, and the power of the battery directly determines the acceleration performance and the climbing capacity of the electric automobile. Therefore, in the conventional power design of the power battery, it is always considered to exert the maximum power capacity of the power battery itself as much as possible. However, since the power usage of the power battery is generally determined based on the estimated State of Charge (SOC) of the power battery, in the existing maximum power design operation of the power battery, whether the corresponding relationship between the designed SOC and the power is accurate is generally considered.

However, in the current design work, how the power of the power battery should be converted under different SOC determination methods affects the power usage of the power battery.

Disclosure of Invention

The embodiment of the application aims to provide a power conversion method and device between power batteries, which are used for solving the problems in the prior art and realizing power conversion of the power batteries with different SOC determination methods, so as to determine whether the whole vehicle can keep stable operation.

In a first aspect, a method for power conversion between power cells is provided, the method may include:

respectively acquiring first SOC information determined by a first power battery in a first SOC determination mode and second SOC information determined by a second power battery in a second SOC determination mode; the SOC information comprises the corresponding SOC of the corresponding power battery at each temperature point;

based on the second SOC information, carrying out SOC conversion on the first SOC information to obtain SOC conversion information of the first power battery in the second SOC determination mode; the SOC conversion information comprises new SOCs corresponding to the temperature points;

determining an SOC association relationship between the first power battery and the second power battery in the second SOC determination mode based on the SOC conversion information and the second SOC information;

and converting the power value in the original power MAP of the first power battery by adopting the SOC association relation to obtain a new power MAP.

In an alternative implementation, respectively acquiring first SOC information determined by the first power battery in a first SOC determination manner and second SOC information determined by the second power battery in a second SOC determination manner, includes:

according to a preset SOC capacity, the SOC capacities of a first power battery and a second power battery are respectively adjusted in a first SOC determination mode and a second SOC determination mode, so that the corresponding SOCs of the first power battery and the second power battery at different temperature points are obtained;

and determining the obtained SOC corresponding to the first power battery at different temperature points as first SOC information, and determining the obtained SOC corresponding to the second power battery at different temperature points as second SOC information.

In an optional implementation, determining the SOC association relationship between the first power battery and the second power battery in the second SOC determination mode based on the SOC conversion information and the second SOC information includes:

based on the SOC conversion information and the second SOC information, determining zero SOC offset between zero SOC corresponding to each temperature point of the first power battery and zero SOC corresponding to the corresponding temperature point of the second power battery in the second SOC determination mode;

and determining the SOC association relation based on the zero SOC offset corresponding to each temperature point.

In an alternative implementation, the SOC association relationship is expressed as: SOC (Y) =soc (X) ×100% -P%) +p%;

the SOC (X) is a new SOC corresponding to any temperature point in the SOC conversion information of the first power battery, the SOC (Y) is a converted SOC corresponding to the temperature point of the first power battery, and P% is a zero SOC offset corresponding to the temperature point.

In an optional implementation, the converting the power value in the original power MAP of the first power battery to obtain a new power MAP using the SOC association relation includes:

and converting power values of different SOCs in the original power MAP of the first power battery at different temperatures by adopting the SOC association relation to obtain a new power MAP.

In an alternative implementation, the SOC determination mode includes a mode of adjusting the SOC according to the capacity at normal temperature to determine each SOC state and a mode of adjusting the SOC according to the capacity at a specific temperature to determine each SOC state.

In a second aspect, a power conversion apparatus between power cells is provided, the apparatus may include:

an acquisition unit configured to acquire first SOC information determined by the first power battery in a first SOC determination manner and second SOC information determined by the second power battery in a second SOC determination manner, respectively; the SOC information comprises the corresponding SOC of the corresponding power battery at each temperature point;

the conversion unit is used for carrying out SOC conversion on the first SOC information based on the second SOC information to obtain the SOC conversion information of the first power battery in the second SOC determination mode; the SOC conversion information comprises new SOCs corresponding to the temperature points;

a determining unit configured to determine an SOC association relationship between the first power battery and the second power battery in the second SOC determination manner based on the SOC conversion information and the second SOC information;

the conversion unit is further configured to convert a power value in an original power MAP of the first power battery by using the SOC association relationship, so as to obtain a new power MAP.

In an alternative implementation, the determining unit is specifically configured to: based on the SOC conversion information and the second SOC information, determining zero SOC offset between zero SOC corresponding to each temperature point of the first power battery and zero SOC corresponding to the corresponding temperature point of the second power battery in the second SOC determination mode;

In a third aspect, an electronic device is provided, the electronic device comprising a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory are in communication with each other via the communication bus;

a memory for storing a computer program;

a processor for implementing the method steps of any one of the above first aspects when executing a program stored on a memory.

In a fourth aspect, a computer-readable storage medium is provided, in which a computer program is stored which, when being executed by a processor, carries out the method steps of any of the first aspects.

The power conversion method between power batteries provided by the embodiment of the application needs to respectively acquire first SOC information determined by the first power battery in a first SOC determination mode and second SOC information determined by the second power battery in a second SOC determination mode; the SOC information comprises the corresponding SOC of the corresponding power battery at each temperature point; then, based on the second SOC information, carrying out SOC conversion on the first SOC information to obtain SOC conversion information of the first power battery in a second SOC determination mode; the SOC conversion information comprises new SOCs corresponding to the temperature points; based on the SOC conversion information and the second SOC information, determining the SOC association relationship of the first power battery and the second power battery in a second SOC determination mode; and converting the power value in the original power MAP of the first power battery by adopting the SOC association relation to obtain a new power MAP. The method realizes the power conversion of the power batteries with different SOC determination methods, ensures that after the unified conversion of the SOC determination methods, not only the quick matching confirmation of the power is realized, but also the development cost and personnel investment are reduced, the development period is shortened, and the consistency of the power capability is ensured, so that the whole vehicle can keep stable operation.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and should not be considered as limiting the scope, and other related drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic flow chart of a power conversion method between power batteries according to an embodiment of the present application;

FIG. 2 is a schematic diagram of a graph of SOC versus temperature of a battery A according to an embodiment of the present application in a battery B SOC determination method;

fig. 3 is a schematic structural diagram of a power conversion device between power batteries according to an embodiment of the present application;

fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Along with the development of various technologies of the power battery, the application of the electric vehicle is more and more extensive, and the improvement of the power performance and the driving range of the electric vehicle is more and more obvious, so that the peak discharge power and the peak feedback power of the power battery of the whole vehicle are more and more required. The power MAP of the power battery is a power meter that records the power under different temperature conditions and different battery State of Charge (SOC) conditions.

The prior art regulates battery usage power by a battery management system (Battery Management System, BMS) sending a single power MAP during battery pulse charging or pulse discharging while the vehicle is traveling. On the one hand, during the discharging process, as time increases, the power map which is not matched with the current battery condition is used, and the undervoltage fault can be frequently triggered due to the overlarge power, so that the power of a vehicle is reduced due to undervoltage protection, or the battery performance is damaged due to overdischarge; on the other hand, during charging, over time, using the power MAP that does not match the current battery condition may frequently trigger an overvoltage fault because the power used is too high, thereby reducing the power because of overvoltage protection to affect the power of the vehicle or damaging the battery performance due to overcharging; in yet another aspect, when the battery has the ability to use high power, a single low power MAP may also affect the vehicle's use. Therefore, the corresponding power MAP needs to be converted for different power batteries.

Therefore, the application provides a power conversion method among power batteries in the power design work of the power batteries, and the method can be applied to a server, a terminal or a system constructed by the server and the terminal. The server may be a physical server, a server cluster or a distributed system formed by a plurality of physical servers, or a cloud server providing cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communication, middleware services, domain name services, security services, content delivery networks (Content Delivery Network, CDN), basic cloud computing services such as big data and artificial intelligent platforms. The Terminal may be a Mobile phone, a smart phone, a notebook computer, a digital broadcast receiver, a Personal Digital Assistant (PDA), a tablet personal computer (PAD), or other User Equipment (UE), a handheld device, a car-mounted device, a wearable device, a computing device, or other processing device connected to a wireless modem, a Mobile Station (MS), a Mobile Terminal (Mobile Terminal), or the like.

In the power design work of the power battery, if the power battery in the current battery management system is a B battery, the B battery is replaced by an A battery at the moment, and because the SOC determination modes of the B battery and the A battery are different, the current battery management system cannot simply perform the work directly after the battery replacement, and the power capacity of the A battery needs to be regulated again to realize that the current battery management system can work normally. Specifically, the power conversion method between power batteries provided by the embodiment of the application can be used for quickly switching the power capacities of the power batteries in two different SOC determination modes in the same design project, so that after the unified conversion of the SOC determination method, the quick matching confirmation of the power is realized, the development cost and personnel investment are reduced, the development period is shortened, the compliance of the power capacities is ensured, and the whole vehicle can keep stable operation.

Further, since the power capability is generally obtained through testing, and a specific determination manner of the SOC of the power capability needs to be defined before power switching, the power conversion method of the present application may include the following specific power conversion process: the correspondence conversion of the SOC determination method and the conversion of the power capability, i.e., the power conversion.

The preferred embodiments of the present application will be described below with reference to the accompanying drawings of the specification, it being understood that the preferred embodiments described herein are for illustration and explanation only, and not for limitation of the present application, and embodiments of the present application and features of the embodiments may be combined with each other without conflict.

Fig. 1 is a schematic flow chart of a power conversion method between power batteries according to an embodiment of the present application. As shown in fig. 1, the method may include:

step S110, respectively obtaining first SOC information determined by the first power battery in a first SOC determination manner and second SOC information determined by the second power battery in a second SOC determination manner.

The SOC information may include SOCs corresponding to respective power batteries at respective temperature points. Since different SOC capacities of the power battery correspond to different SOC states, the different SOC states can represent different power capacities of the power battery, and therefore, the SOC corresponding to each temperature point can be understood as the SOC state or the SOC capacity. The SOC determination method may include a method of determining each SOC state by adjusting the SOC in accordance with the capacity at normal temperature and a method of determining each SOC state by adjusting the SOC in accordance with the capacity at a specific temperature.

Then, according to the preset SOC capacity, the SOC capacities of the first power battery A and the second power battery B are respectively adjusted in a first SOC determination mode and a second SOC determination mode, so that the corresponding SOCs of the first power battery A and the second power battery B at different temperature points are obtained; specifically, the SOC is adjusted according to the capacity at normal temperature, that is, the SOC determination method at each temperature is: each SOC state is determined by charging and discharging every 5% of Chang Wenbiao capacity (such as 5% SOC); the SOC is adjusted according to the capacity at a specific temperature, that is, the SOC determination method at each temperature is: each SOC state is determined by charging and discharging every 5% of each temperature capacity at each temperature.

Further, the SOC capacity of the power battery is adjusted every preset SOC capacity, so that the relation between different temperatures and the SOC capacity of the power battery, which accords with the linear rule, can be obtained. The preferable range of the preset SOC capacity may be 5-8% SOC, and the preset SOC capacity is preferably 5% SOC.

And then, determining the obtained SOC corresponding to the first power battery A at different temperature points as first SOC information, and determining the obtained SOC corresponding to the second power battery B at different temperature points as second SOC information.

Step S120, performing SOC conversion on the first SOC information based on the second SOC information, to obtain SOC conversion information of the first power battery in the second SOC determination mode.

The SOC conversion information may include a new SOC corresponding to each temperature point.

Based on the second SOC information, the first SOC information is subjected to SOC conversion, so that the first SOC determination mode of the first power battery A can be converted into the second SOC determination mode of the second power battery, and the new SOC corresponding to each temperature point of the first power battery A in the second SOC determination mode is obtained.

And step S130, determining the SOC association relationship of the first power battery and the second power battery in the second SOC determination mode based on the SOC conversion information and the second SOC information.

In specific implementation, based on the SOC conversion information and the second SOC information, determining zero SOC offset between zero SOC corresponding to each temperature point of the first power battery A and zero SOC corresponding to the corresponding temperature point of the second power battery B in a second SOC determination mode;

and determining the SOC association relationship based on the zero SOC offset corresponding to each temperature point.

In one embodiment, the SOC association relationship may be expressed as: SOC (Y) =soc (X) ×100% -P%) +p%;

the SOC (X) is a new SOC corresponding to any temperature point in the SOC conversion information of the first power battery a, the SOC (Y) is a converted SOC corresponding to the temperature point of the first power battery a, and P% is a zero SOC offset corresponding to the temperature point.

And step 140, converting the power value in the original power MAP of the first power battery by adopting the SOC association relation to obtain a new power MAP.

And converting power values of different SOCs in the original power MAP of the first power battery A at different temperatures by adopting an SOC association relation to obtain a new power MAP.

For example, in the two batteries, the SOC determination method used in the low-temperature power determination of the battery a is the normal-temperature capacity determination method, and the SOC determination method used in the low-temperature power determination of the battery B is the low-temperature capacity determination method (i.e., a method of adjusting the SOC to determine the SOC states according to the capacity at a specific temperature).

Assuming that the normal temperature capacity of the battery A is Q1, and the capacity of the battery A at the low temperature of minus 20 ℃ is Q2; the battery of type B has a capacity of Q3 at normal temperature and a capacity of Q4 at a low temperature of-20 ℃.

Then, in the normal temperature capacity SOC determination method of the type a battery, the corresponding discharge capacity Q1 of 0% SOC is adjusted at a low temperature of-20 ℃, that is, the type a battery is adjusted to the discharge capacity Q1 of 0% SOC at the normal temperature capacity. In the SOC determination method for the battery B, the 0% SOC discharge capacity is adjusted to Q4 at a low temperature of-20 ℃, that is, the battery B is adjusted to the 0% SOC discharge capacity Q4 at a low temperature of-20 ℃.

If the SOC determination method of the battery A is converted into the SOC determination method of the battery B, obtaining SOC conversion information of the battery A;

the SOC conversion information includes that the SOC of the A battery corresponding to 0% SOC of the B battery at the low temperature of-20 ℃ is not 0%, but is 1-Q2/Q1, namely zero SOC offset corresponding to the low temperature of-20 ℃.

Similarly, the zero SOC offset corresponding to each temperature point of the battery A can be determined by the battery B SOC determination method, namely, the 0% SOC position of the battery A at each temperature point is determined at the moment, so that a linear curve can be drawn as shown in fig. 2.

After determining the 0% SOC position of the A battery under the B battery SOC determination method, unifying the SOC ranges of the A battery under the B battery SOC determination method: 1-Q2/Q1-100% SOC corresponds to 0% -100% SOC of the battery B. As can be seen from fig. 2, at-20 ℃, 1-Q2/q1=20%, the 20% -100% SOC of the type a battery corresponds to the 0% -100% SOC of the type B battery.

Based on the above SOC (Y) =soc (X) (100% -P%) +p), it can be known that the power value after conversion corresponding to the 5% SOC of the battery primary a is the power value corresponding to soc=5% (100% -20%) +20% =24%), and so on, the conversion determines the power values at different temperatures of different SOCs, thereby completing the conversion of the entire power MAP.

Corresponding to the above method, the embodiment of the present application further provides a power conversion device between power batteries, as shown in fig. 3, where the device includes:

an acquiring unit 310 configured to acquire first SOC information determined by the first power battery in a first SOC determination manner and second SOC information determined by the second power battery in a second SOC determination manner, respectively; the SOC information comprises the corresponding SOC of the corresponding power battery at each temperature point;

a conversion unit 320, configured to perform SOC conversion on the first SOC information based on the second SOC information, to obtain SOC conversion information of the first power battery in the second SOC determination mode; the SOC conversion information comprises new SOCs corresponding to the temperature points;

a determining unit 330, configured to determine, based on the SOC conversion information and the second SOC information, an SOC association relationship between the first power battery and the second power battery in the second SOC determination mode;

the converting unit 320 is further configured to convert a power value in the original power MAP of the first power battery by using the SOC association relationship to obtain a new power MAP.

The functions of each functional unit of the power conversion device between power batteries provided in the above embodiments of the present application may be implemented by the above method steps, so that the specific working process and beneficial effects of each unit in the power conversion device between power batteries provided in the embodiment of the present application are not repeated herein.

The embodiment of the present application further provides an electronic device, as shown in fig. 4, including a processor 410, a communication interface 420, a memory 430, and a communication bus 440, where the processor 410, the communication interface 420, and the memory 430 complete communication with each other through the communication bus 440.

A memory 430 for storing a computer program;

the processor 410 is configured to execute the program stored in the memory 430, and implement the following steps:

The communication bus mentioned above may be a peripheral component interconnect standard (Peripheral Component Interconnect, PCI) bus or an extended industry standard architecture (Extended Industry Standard Architecture, EISA) bus, or the like. The communication bus may be classified as an address bus, a data bus, a control bus, or the like. For ease of illustration, the figures are shown with only one bold line, but not with only one bus or one type of bus.

The communication interface is used for communication between the electronic device and other devices.

The Memory may include random access Memory (Random Access Memory, RAM) or may include Non-Volatile Memory (NVM), such as at least one disk Memory. Optionally, the memory may also be at least one memory device located remotely from the aforementioned processor.

The processor may be a general-purpose processor, including a central processing unit (Central Processing Unit, CPU), a network processor (Network Processor, NP), etc.; but also digital signal processors (Digital Signal Processing, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

Since the implementation manner and the beneficial effects of the solution to the problem of each device of the electronic apparatus in the foregoing embodiment may be implemented by referring to each step in the embodiment shown in fig. 1, the specific working process and the beneficial effects of the electronic apparatus provided by the embodiment of the present application are not repeated herein.

In yet another embodiment of the present application, a computer readable storage medium is provided, in which instructions are stored, which when run on a computer, cause the computer to perform the power conversion method between power cells according to any one of the above embodiments.

In yet another embodiment of the present application, a computer program product containing instructions that, when run on a computer, cause the computer to perform the method of power conversion between power cells of any of the above embodiments is also provided.

It will be appreciated by those skilled in the art that embodiments of the present application may be provided as methods, systems, or computer program products. Accordingly, embodiments of the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present application may take the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

Embodiments of the present application are described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the embodiments of the application.

It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present application without departing from the spirit or scope of the embodiments of the application. Thus, if such modifications and variations of the embodiments of the present application fall within the scope of the claims and the equivalents thereof, it is intended that such modifications and variations be included in the embodiments of the present application.

Claims

1. A method of power conversion between power cells, the method comprising:

2. The method of claim 1, wherein separately acquiring first SOC information determined by the first power battery in a first SOC determination and second SOC information determined by the second power battery in a second SOC determination, comprises:

3. The method of claim 1, wherein determining the SOC association relationship of the first power battery and the second power battery in the second SOC determination-scheme based on the SOC conversion information and the second SOC information comprises:

4. The method of claim 3, wherein the SOC association relationship is expressed as: SOC (Y) =soc (X) ×100% -P%) +p%;

5. The method of claim 1, wherein converting the power value in the original power MAP of the first power battery to obtain a new power MAP using the SOC correlation comprises:

6. The method of claim 1, wherein the SOC determination means includes means for determining each SOC state by adjusting the SOC in accordance with a capacity at normal temperature, and means for determining each SOC state by adjusting the SOC in accordance with a capacity at a specific temperature.

7. A power conversion device between power cells, said device comprising:

8. The apparatus of claim 7, wherein the determining unit is specifically configured to: based on the SOC conversion information and the second SOC information, determining zero SOC offset between zero SOC corresponding to each temperature point of the first power battery and zero SOC corresponding to the corresponding temperature point of the second power battery in the second SOC determination mode;

9. An electronic device, characterized in that the electronic device comprises a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory are in communication with each other through the communication bus;

a memory for storing a computer program;

a processor for implementing the method of any of claims 1-6 when executing a program stored on a memory.

10. A computer readable storage medium, characterized in that the computer readable storage medium has stored therein a computer program which, when executed by a processor, implements the method of any of claims 1-6.