A method and device for detecting the charge imbalance of an automobile battery

Abstract

The application provides a detection method and device for the charge unbalance degree of an automobile battery, which comprises the following steps: obtaining the charging data of the automobile battery during charging when a target vehicle is subjected to slow charging; determining the highest voltage monomer when the slow charging is completed according to the charging data; determining the charging voltage data of the highest voltage monomer according to the charging data; determining the first occurrence time of the minimum charging voltage and the second occurrence time of the maximum charging voltage according to the charging voltage data; and calculating the charge unbalance degree according to the first occurrence time, the second occurrence time and the preset nominal capacity of the battery cell. It can be seen that the method and device can detect the charge unbalance degree of the battery by using only the slow charging full condition data without discharging to a low charge state and long time standing, effectively increasing the judgment opportunity of balancing, thereby helping to start balancing and prolonging the service life of the automobile battery.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a method and apparatus for detecting the charge imbalance of an automotive battery. Background Technology

[0002] Currently, battery management systems for new energy vehicles typically use the voltage difference between the highest and lowest charged cells to determine the charge imbalance between cells. However, for lithium iron phosphate systems, due to their relatively flat voltage plateau and small voltage changes in the plateau region, the static voltage difference can only be used to determine charge consistency in the non-plateau region (low charge) after a sufficiently long period of rest. However, this condition rarely occurs when users are using the vehicle. Therefore, using static voltage difference as a method to determine charge imbalance in automotive batteries is insufficient. Summary of the Invention

[0003] The purpose of this application is to provide a method and apparatus for detecting the charge imbalance of an automotive battery. This method can detect the charge imbalance of the battery using only the data from a slow full charge, without discharging it to a low charge state and leaving it idle for a long time. This effectively increases the opportunity for balancing and helps to extend the life of the automotive battery by initiating balancing.

[0004] The first aspect of this application provides a method for detecting the charge imbalance of an automotive battery, comprising:

[0005] When the target vehicle is being slowly charged, acquire the charging data of the car battery during the charging process;

[0006] When the car battery completes slow charging, the highest voltage cell when it is fully charged is determined based on the charging data.

[0007] The charging voltage data of the highest voltage cell is determined based on the charging data;

[0008] Based on the charging voltage data, determine the first occurrence time of the first occurrence of the minimum charging voltage and the second occurrence time of the first occurrence of the maximum charging voltage;

[0009] The charge imbalance is calculated based on the first occurrence time, the second occurrence time, and the preset nominal cell capacity.

[0010] Furthermore, the charging data includes voltage data, current data, and time data during the charging process of the vehicle battery.

[0011] Further, determining the first occurrence time of the minimum charging voltage and the second occurrence time of the maximum charging voltage based on the charging voltage data includes:

[0012] Based on the charging voltage data and the time extension sequence, determine the first occurrence of the maximum charging voltage and the first occurrence of the minimum charging voltage;

[0013] The first occurrence time corresponding to the minimum charging voltage and the second occurrence time corresponding to the maximum charging voltage are determined based on the charging voltage data.

[0014] Furthermore, the formula for calculating the charge imbalance is:

[0015] S = ΔAh / C * 100%;

[0016] in,

[0017] Wherein, S is the charge imbalance degree, C is the preset nominal capacity of the battery cell, t1 is the first occurrence time, t2 is the second occurrence time, and I represents the current data during the charging process of the car battery.

[0018] A second aspect of this application provides a device for detecting the charge imbalance of an automotive battery, the device comprising:

[0019] The acquisition unit is used to acquire charging data of the car battery during the charging process when the target vehicle is being slowly charged.

[0020] The first determining unit is used to determine the highest voltage cell when the slow charging is fully charged based on the charging data when the car battery completes slow charging.

[0021] The second determining unit is used to determine the charging voltage data of the highest voltage cell based on the charging data;

[0022] The third determining unit is used to determine, based on the charging voltage data, the first occurrence time of the first occurrence of the minimum charging voltage and the second occurrence time of the first occurrence of the maximum charging voltage;

[0023] The calculation unit is used to calculate the charge imbalance based on the first occurrence time, the second occurrence time, and the preset nominal capacity of the battery cell.

[0024] Furthermore, the charging data includes voltage data, current data, and time data during the charging process of the vehicle battery.

[0025] Furthermore, the third determining unit includes:

[0026] The first determining subunit is used to determine the first occurrence of the maximum charging voltage and the first occurrence of the minimum charging voltage based on the charging voltage data and the time extension sequence.

[0027] The second determining subunit is used to determine the first occurrence time corresponding to the minimum charging voltage and the second occurrence time corresponding to the maximum charging voltage based on the charging voltage data.

[0028] Furthermore, the formula for calculating the charge imbalance is:

[0029] S = ΔAh / C * 100%;

[0030] in,

[0031] Wherein, S is the charge imbalance degree, C is the preset nominal capacity of the battery cell, t1 is the first occurrence time, t2 is the second occurrence time, and I represents the current data during the charging process of the car battery.

[0032] A third aspect of this application provides an electronic device, including a memory and a processor, wherein the memory stores a computer program, and the processor runs the computer program to cause the electronic device to perform the method for detecting the charge imbalance of an automotive battery as described in any of the first aspects of this application.

[0033] The fourth aspect of this application provides a computer-readable storage medium storing computer program instructions, which, when read and executed by a processor, perform the method for detecting the charge imbalance of an automobile battery as described in any one of the first aspects of this application.

[0034] The beneficial effects of this application are as follows: the method and device can detect the charge imbalance of the battery by using only the data of the slow charging condition without discharging to a low charge state and leaving it at rest for a long time. This effectively increases the opportunity for balancing judgment, thereby helping to start balancing and extend the life of the car battery. Attached Figure Description

[0035] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 A flowchart illustrating a method for detecting charge imbalance in an automotive battery, provided in an embodiment of this application;

[0037] Figure 2 A flowchart illustrating another method for detecting the charge imbalance of an automotive battery provided in this application embodiment;

[0038] Figure 3 A schematic diagram of the structure of a device for detecting the charge imbalance of an automotive battery provided in an embodiment of this application;

[0039] Figure 4 A schematic diagram of another vehicle battery charge imbalance detection device provided in an embodiment of this application;

[0040] Figure 5 A schematic diagram of voltage-time relationship provided in an embodiment of this application;

[0041] Figure 6 This is a schematic diagram of the current-time relationship provided in an embodiment of this application. Detailed Implementation

[0042] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0043] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this application, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0044] Example 1

[0045] Please refer to Figure 1 , Figure 1 This is a flowchart illustrating a method for detecting charge imbalance in an automotive battery, as provided in this embodiment. The method includes:

[0046] S101. When the target vehicle is being slowly charged, acquire the charging data of the vehicle battery during the charging process.

[0047] In this embodiment, the charging data includes voltage data, current data, and time data during the charging process of the vehicle battery.

[0048] S102. When the car battery completes slow charging, determine the highest voltage cell when it is fully charged based on the charging data.

[0049] S103. Determine the charging voltage data of the highest voltage cell based on the charging data.

[0050] S104. Determine the first occurrence time of the minimum charging voltage and the second occurrence time of the maximum charging voltage based on the charging voltage data.

[0051] S105. Calculate the charge imbalance based on the first occurrence time, the second occurrence time, and the preset nominal capacity of the battery cell.

[0052] In this embodiment, the formula for calculating the degree of charge imbalance is:

[0053] S = ΔAh / C * 100%;

[0054] in,

[0055] Where S represents the charge imbalance, C represents the preset nominal capacity of the battery cell, t1 represents the first occurrence time, t2 represents the second occurrence time, and I represents the current data during the charging process of the car battery.

[0056] In this embodiment, the automotive battery can specifically be a lithium iron phosphate battery.

[0057] In this embodiment, the subject executing the method can be a computing device such as a computer or server, and no limitation is made in this embodiment.

[0058] In this embodiment, the subject executing the method can also be a smart device such as a smartphone or tablet, and no limitation is made in this embodiment.

[0059] As can be seen, the method for detecting the charge imbalance of automotive batteries described in this embodiment can take into account the driver's driving habits. Without discharging to a low charge state and leaving the battery idle for a long time, the charge imbalance of the battery can be detected using only the data from the slow charging full charge condition. This effectively increases the opportunity for balancing, thereby helping to initiate balancing and extend the life of lithium iron phosphate batteries.

[0060] Example 2

[0061] Please refer to Figure 2 , Figure 2 This is a flowchart illustrating a method for detecting charge imbalance in an automotive battery, as provided in this embodiment. The method includes:

[0062] S201. When the target vehicle is being slowly charged, acquire the charging data of the vehicle battery during the charging process.

[0063] In this embodiment, the charging data includes voltage data, current data, and time data during the charging process of the vehicle battery.

[0064] In this embodiment, when the vehicle is slow-charging, the current data I, the time data t, and the voltage data V of each cell during the charging process are recorded. i (i is the cell number).

[0065] In this embodiment, the method mainly calculates the charge imbalance between battery cells using data from the vehicle's slow charging process.

[0066] S202. When the car battery completes slow charging, determine the highest voltage cell when it is fully charged based on the charging data.

[0067] S203. Determine the charging voltage data of the highest voltage cell based on the charging data.

[0068] In this embodiment, the charging voltage data includes the highest voltage V of the highest voltage cell. max and minimum voltage V min .

[0069] S204. Based on the charging voltage data and the time extension sequence, determine the first occurrence of the maximum charging voltage and the first occurrence of the minimum charging voltage.

[0070] S205. Determine the first occurrence time corresponding to the minimum charging voltage and the second occurrence time corresponding to the maximum charging voltage based on the charging voltage data.

[0071] S206. Calculate the charge imbalance based on the first occurrence time, the second occurrence time, and the preset nominal capacity of the battery cell.

[0072] In this embodiment, the formula for calculating the degree of charge imbalance is:

[0073] S = ΔAh / C * 100%;

[0074] in,

[0075] Where S represents the charge imbalance, C represents the preset nominal capacity of the battery cell, t1 represents the first occurrence time, t2 represents the second occurrence time, and I represents the current data during the charging process of the car battery.

[0076] Please refer to Figure 5 and Figure 6 , Figure 5 A schematic diagram illustrating the voltage-time relationship is shown. Figure 6 A schematic diagram illustrating the current-time relationship is shown. In this method, the highest voltage cell is numbered n, and the charging voltage data V of the highest voltage cell is selected. n At this point, search in chronological order and find the first occurrence of V. min Let t1 be the time when V first appears. max Let the time be t2, and then calculate the integral of the current from t1 to t2. If the nominal capacity of the battery cell is C, then the charge imbalance of the battery is S = ΔAh / C*100%.

[0077] In this embodiment, current battery management systems for new energy vehicles typically use the voltage difference between the highest and lowest charged cells to determine the charge imbalance between cells. However, for lithium iron phosphate (LFP) systems, due to their relatively flat voltage plateau and minimal voltage variation in the plateau region, charge consistency can only be determined by using static voltage difference after the non-plateau region (low charge) has been left to stand for a sufficiently long time. However, this condition rarely occurs during vehicle use by end users. Therefore, using static voltage difference as a method for determining charge imbalance in LFP systems is insufficient. To address this deficiency, this method proposes a detection system that can calculate charge imbalance using charging process data.

[0078] In this embodiment, the subject executing the method can be a computing device such as a computer or server, and no limitation is made in this embodiment.

[0079] In this embodiment, the subject executing the method can also be a smart device such as a smartphone or tablet, and no limitation is made in this embodiment.

[0080] As can be seen, the method for detecting the charge imbalance of automotive batteries described in this embodiment can take into account the driver's driving habits. Without discharging to a low charge state and leaving the battery idle for a long time, the charge imbalance of the battery can be detected using only the data from the slow charging full charge condition. This effectively increases the opportunity for balancing, thereby helping to initiate balancing and extend the life of lithium iron phosphate batteries.

[0081] Example 3

[0082] Please refer to Figure 3 , Figure 3 This is a schematic diagram of a device for detecting the charge imbalance of an automotive battery provided in this embodiment. Figure 3 As shown, the device for detecting the charge imbalance of a car battery includes:

[0083] The acquisition unit 310 is used to acquire the charging data of the car battery during the charging process when the target vehicle is being slowly charged.

[0084] The first determining unit 320 is used to determine the highest voltage cell when the slow charging is fully charged based on the charging data when the car battery completes slow charging.

[0085] The second determining unit 330 is used to determine the charging voltage data of the highest voltage cell based on the charging data.

[0086] The third determining unit 340 is used to determine the first occurrence time of the first occurrence of the minimum charging voltage and the second occurrence time of the first occurrence of the maximum charging voltage based on the charging voltage data.

[0087] The calculation unit 350 is used to calculate the charge imbalance based on the first occurrence time, the second occurrence time, and the preset nominal capacity of the battery cell.

[0088] In this embodiment, the explanation of the detection device for the unbalanced charge of the automobile battery can be referred to the description in Embodiment 1 or Embodiment 2, and will not be repeated here.

[0089] As can be seen, the detection device for the charge imbalance of automobile batteries described in this embodiment can take into account the driver's driving habits. Without discharging to a low charge state and leaving the battery idle for a long time, the charge imbalance of the battery can be detected using only the data from the slow charging full charge condition. This effectively increases the opportunity for balancing, thereby helping to start balancing and extend the life of lithium iron phosphate batteries.

[0090] Example 4

[0091] Please refer to Figure 4 , Figure 4 This is a schematic diagram of a device for detecting the charge imbalance of an automotive battery provided in this embodiment. Figure 4 As shown, the device for detecting the charge imbalance of a car battery includes:

[0092] The acquisition unit 310 is used to acquire the charging data of the car battery during the charging process when the target vehicle is being slowly charged.

[0093] The first determining unit 320 is used to determine the highest voltage cell when the slow charging is fully charged based on the charging data when the car battery completes slow charging.

[0094] The second determining unit 330 is used to determine the charging voltage data of the highest voltage cell based on the charging data.

[0095] The third determining unit 340 is used to determine the first occurrence time of the first occurrence of the minimum charging voltage and the second occurrence time of the first occurrence of the maximum charging voltage based on the charging voltage data.

[0096] The calculation unit 350 is used to calculate the charge imbalance based on the first occurrence time, the second occurrence time, and the preset nominal capacity of the battery cell.

[0097] In this embodiment, the charging data includes voltage data, current data, and time data during the charging process of the vehicle battery.

[0098] As an optional implementation, the third determining unit 340 includes:

[0099] The first determining subunit 341 is used to determine the first occurrence of the maximum charging voltage and the first occurrence of the minimum charging voltage based on the charging voltage data and the time extension sequence.

[0100] The second determining subunit 342 is used to determine the first occurrence time corresponding to the minimum charging voltage and the second occurrence time corresponding to the maximum charging voltage based on the charging voltage data.

[0101] In this embodiment, the formula for calculating the degree of charge imbalance is:

[0102] S = ΔAh / C * 100%;

[0103] in,

[0104] Where S represents the charge imbalance, C represents the preset nominal capacity of the battery cell, t1 represents the first occurrence time, t2 represents the second occurrence time, and I represents the current data during the charging process of the car battery.

[0105] In this embodiment, the explanation of the detection device for the unbalanced charge of the automobile battery can be referred to the description in Embodiment 1 or Embodiment 2, and will not be repeated here.

[0106] As can be seen, the detection device for the charge imbalance of automobile batteries described in this embodiment can take into account the driver's driving habits. Without discharging to a low charge state and leaving the battery idle for a long time, the charge imbalance of the battery can be detected using only the data from the slow charging full charge condition. This effectively increases the opportunity for balancing, thereby helping to start balancing and extend the life of lithium iron phosphate batteries.

[0107] This application provides an electronic device, including a memory and a processor. The memory stores a computer program, and the processor runs the computer program to enable the electronic device to perform the method for detecting the charge imbalance of an automotive battery as described in Embodiment 1 or Embodiment 2 of this application.

[0108] This application provides a computer-readable storage medium storing computer program instructions. When the computer program instructions are read and executed by a processor, the method for detecting the unbalanced charge of an automotive battery as described in Embodiment 1 or Embodiment 2 of this application is performed.

[0109] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can also be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0110] In addition, the functional modules in the various embodiments of this application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0111] If the aforementioned functions are implemented as software functional modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0112] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application. It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0113] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0114] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A method for detecting charge imbalance in automotive batteries, characterized in that, include: When the target vehicle is being slowly charged, acquire the charging data of the car battery during the charging process; When the car battery completes slow charging, the highest voltage cell when it is fully charged is determined based on the charging data. The charging voltage data of the highest voltage cell is determined based on the charging data; Based on the charging voltage data, determine the first occurrence time of the first occurrence of the minimum charging voltage and the second occurrence time of the first occurrence of the maximum charging voltage; The charge imbalance is calculated based on the first occurrence time, the second occurrence time, and the preset nominal cell capacity. The formula for calculating the degree of charge imbalance is as follows: S = ΔAh / C * 100%; in, ; Wherein, S is the charge imbalance degree, C is the preset nominal capacity of the battery cell, t1 is the first occurrence time, t2 is the second occurrence time, and I represents the current data during the charging process of the car battery.

2. The method for detecting the charge imbalance of an automotive battery according to claim 1, characterized in that, The charging data includes voltage data, current data, and time data during the charging process of the vehicle battery.

3. The method for detecting the charge imbalance of an automotive battery according to claim 1, characterized in that, Determining the first occurrence time of the minimum charging voltage and the second occurrence time of the maximum charging voltage based on the charging voltage data includes: Based on the charging voltage data and the time extension sequence, determine the first occurrence of the maximum charging voltage and the first occurrence of the minimum charging voltage; The first occurrence time corresponding to the minimum charging voltage and the second occurrence time corresponding to the maximum charging voltage are determined based on the charging voltage data.

4. A device for detecting the charge imbalance of an automotive battery, characterized in that, The device for detecting the charge imbalance of the vehicle battery includes: The acquisition unit is used to acquire charging data of the car battery during the charging process when the target vehicle is being slowly charged. The first determining unit is used to determine the highest voltage cell when the slow charging is fully charged based on the charging data when the car battery completes slow charging. The second determining unit is used to determine the charging voltage data of the highest voltage cell based on the charging data; The third determining unit is used to determine, based on the charging voltage data, the first occurrence time of the first occurrence of the minimum charging voltage and the second occurrence time of the first occurrence of the maximum charging voltage; The calculation unit is used to calculate the charge imbalance based on the first occurrence time, the second occurrence time, and the preset nominal capacity of the battery cell; The formula for calculating the degree of charge imbalance is as follows: S = ΔAh / C * 100%; in, ; Wherein, S is the charge imbalance degree, C is the preset nominal capacity of the battery cell, t1 is the first occurrence time, t2 is the second occurrence time, and I represents the current data during the charging process of the car battery.

5. The detection device for the charge imbalance of an automobile battery according to claim 4, characterized in that, The charging data includes voltage data, current data, and time data during the charging process of the vehicle battery.

6. The detection device for the charge imbalance of an automotive battery according to claim 4, characterized in that, The third determining unit includes: The first determining subunit is used to determine the first occurrence of the maximum charging voltage and the first occurrence of the minimum charging voltage based on the charging voltage data and the time extension sequence. The second determining subunit is used to determine the first occurrence time corresponding to the minimum charging voltage and the second occurrence time corresponding to the maximum charging voltage based on the charging voltage data.

7. An electronic device, characterized in that, The electronic device includes a memory and a processor, the memory being used to store a computer program, and the processor running the computer program to cause the electronic device to perform the method for detecting the charge imbalance of an automotive battery as described in any one of claims 1 to 3.

8. A readable storage medium, characterized in that, The readable storage medium stores computer program instructions, which, when read and executed by a processor, perform the method for detecting the charge imbalance of an automotive battery as described in any one of claims 1 to 3.

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