CN116736119A - Method and system for calculating residual capacity of battery pack - Google Patents
Method and system for calculating residual capacity of battery pack Download PDFInfo
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Abstract
The application belongs to the technical field of vehicle battery packs, and discloses a method and a system for calculating the residual capacity of a battery pack, wherein the method comprises the following steps: acquiring a battery pack for acquisition and analysis to obtain the dynamic voltage and the real-time temperature of the battery pack; calculating the residual electric quantity of the battery pack according to the dynamic voltage and the real-time temperature through a pre-configured electric quantity calculation model; the electric quantity calculation model is obtained through training of full-charge voltage, feed voltage and battery temperature compensation coefficient of the battery pack. The application can continuously run in a starting state of the vehicle, takes a fixed time slice as a basis, circularly collects the dynamic voltage of the battery pack, takes the full voltage of the battery pack as the upper limit of calculation, takes the voltage of the battery pack with insufficient voltage as the lower limit of calculation, calculates the residual electric quantity of the battery pack, realizes the accurate calculation of the residual electric quantity of the battery pack, solves the problems that the existing battery pack electric quantity calculation is inaccurate, avoids the phenomenon that the vehicle shows full power but can not run suddenly and the electric quantity drops suddenly to zero, and improves the reliability and safety of the vehicle.
Description
Technical Field
The application relates to the technical field of vehicle battery packs, in particular to a method and a system for calculating the residual capacity of a battery pack.
Background
Currently, electric vehicles are rapidly developed as an important component of the new energy field. Various electric vehicles such as electric forklifts, electric automobiles, electric buses, and the like have appeared on the market.
In the prior art applications, lead acid batteries and lithium batteries are widely used, especially lithium batteries, with more installed capacity. At present, in order to control the cost, a host computer factory does not need to arrange a BMS system in a lithium battery pack, so that larger pressure is brought to the whole vehicle system, and how to accurately calculate the residual power of the vehicle becomes a current problem.
Therefore, a system capable of accurately calculating the remaining battery power is highly required to deal with the generated problems, and the accuracy of the remaining battery power calculation is particularly important.
Disclosure of Invention
The embodiment of the application provides a method and a system for calculating the residual capacity of a battery pack, which are used for solving the problem of inaccurate calculation of the residual capacity of the battery pack in the prior art.
According to a first aspect of an embodiment of the present application, a method for calculating a remaining battery power of a battery pack is provided.
In one embodiment, the method for calculating the remaining battery power includes:
acquiring a battery pack for acquisition and analysis to obtain dynamic voltage and real-time temperature of the battery pack;
calculating the residual electric quantity of the battery pack according to the dynamic voltage and the real-time temperature through a pre-configured electric quantity calculation model;
the electric quantity calculation model is obtained through training of full-charge voltage, feed voltage and battery temperature compensation coefficient of the battery pack.
In one embodiment, the calculation formula of the electric quantity calculation model is:
residual electric quantity
In the formula, VD pack A dynamic voltage for the battery pack; VE (VE) pack A voltage deficient for the battery pack; VF_pack is the full voltage of the battery pack; vt_cell is the battery temperature compensation coefficient of the battery pack.
In one embodiment, the full voltage of the battery pack is calculated by the following formula:
VF_pack＝VF_cell*N_cell+VT_cell
wherein VF_pack is the full voltage of the battery pack; VF_cell is the full voltage of the single battery of the battery pack; n_cell is the number of single batteries of the battery pack; the VT_cell is a battery temperature compensation coefficient of the battery pack, and the battery temperature compensation coefficient is a voltage compensation value at different working temperatures.
In one embodiment, the calculation formula of the voltage deficiency of the battery pack is:
VE_pack＝VE_cell*N_cell+VT_cell
wherein VE_pack is the voltage of the battery pack; ve_cell is the voltage of the battery pack for power shortage of the single battery; n_cell is the number of single batteries of the battery pack; vt_cell is the battery temperature compensation coefficient of the battery pack.
In one embodiment, the dynamic voltage of the battery pack is calculated by the following formula:
in the formula, VD pack A dynamic voltage for the battery pack; v (V) t0 The real-time voltage of the battery pack acquired for the first time during each calculation is obtained; v (V) t1 ～V tn The real-time voltage of the battery pack is collected for a fixed time slice; vt_cell is the battery temperature compensation coefficient of the battery pack.
According to a second aspect of an embodiment of the present application, there is provided a battery pack remaining power calculation system.
In one embodiment, the battery pack remaining power calculation system includes:
the acquisition and analysis module is used for acquiring a battery pack for acquisition and analysis to obtain the dynamic voltage and the real-time temperature of the battery pack;
the electric quantity calculation module is used for calculating the residual electric quantity of the battery pack through a pre-configured electric quantity calculation model according to the dynamic voltage and the real-time temperature; the electric quantity calculation model is obtained through training of full-charge voltage, feed voltage and battery temperature compensation coefficient of the battery pack.
In one embodiment, the calculation formula of the electric quantity calculation model is:
residual electric quantity
In the formula, VD pack A dynamic voltage for the battery pack; VE (VE) pack A voltage deficient for the battery pack; VF_pack is the full voltage of the battery pack; vt_cell is the battery temperature compensation coefficient of the battery pack.
In one embodiment, the full voltage of the battery pack is calculated by the following formula:
VF_pack＝VF_cell*N_cell+VT_cell
wherein VF_pack is the full voltage of the battery pack; VF_cell is the full voltage of the single battery of the battery pack; n_cell is the number of single batteries of the battery pack; the VT_cell is a battery temperature compensation coefficient of the battery pack, and the battery temperature compensation coefficient is a voltage compensation value at different working temperatures.
In one embodiment, the calculation formula of the voltage deficiency of the battery pack is:
VE_pack＝VE_cell*N_cell+VT_cell
wherein VE_pack is the voltage of the battery pack; ve_cell is the voltage of the battery pack for power shortage of the single battery; n_cell is the number of single batteries of the battery pack; vt_cell is the battery temperature compensation coefficient of the battery pack.
In one embodiment, the dynamic voltage of the battery pack is calculated by the following formula:
in the formula, VD pack A dynamic voltage for the battery pack; v (V) t0 The real-time voltage of the battery pack acquired for the first time during each calculation is obtained; v (V) t1 ～V tn The real-time voltage of the battery pack is collected for a fixed time slice; VT_cell is the battery temperature compensation system of the battery packA number.
The technical scheme provided by the embodiment of the application can have the following beneficial effects:
the application can continuously run in a starting state of the vehicle, takes a fixed time slice as a basis, circularly collects the dynamic voltage of the battery pack, takes the full voltage of the battery pack as the upper limit of calculation, takes the voltage of the battery pack with insufficient voltage as the lower limit of calculation, calculates the residual electric quantity of the battery pack, realizes the accurate calculation of the residual electric quantity of the battery pack, solves the problems that the existing battery pack electric quantity calculation is inaccurate, avoids the phenomenon that the vehicle shows full power but can not run suddenly and the electric quantity drops suddenly to zero, and improves the reliability and safety of the vehicle.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.
Fig. 1 is a flowchart illustrating a method of calculating a remaining battery power of a battery pack according to an exemplary embodiment;
FIG. 2 is a block diagram of a battery pack remaining power calculation system, according to an exemplary embodiment;
FIG. 3 is a circuit diagram illustrating a voltage acquisition unit according to an exemplary embodiment;
FIG. 4 is a graph illustrating dynamic discharge at various temperature points, according to an example embodiment;
fig. 5 is a schematic diagram of a computer device, according to an example embodiment.
Detailed Description
The following description and the drawings sufficiently illustrate specific embodiments herein to enable those skilled in the art to practice them. Portions and features of some embodiments may be included in, or substituted for, those of others. The scope of the embodiments herein includes the full scope of the claims, as well as all available equivalents of the claims. The terms "first," "second," and the like herein are used merely to distinguish one element from another element and do not require or imply any actual relationship or order between the elements. Indeed the first element could also be termed a second element and vice versa. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a structure, apparatus, or device that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such structure, apparatus, or device. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a structure, apparatus or device comprising the element. Various embodiments are described herein in a progressive manner, each embodiment focusing on differences from other embodiments, and identical and similar parts between the various embodiments are sufficient to be seen with each other.
The terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like herein refer to an orientation or positional relationship based on that shown in the drawings, merely for ease of description herein and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operate in a particular orientation, and thus are not to be construed as limiting the application. In the description herein, unless otherwise specified and limited, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, mechanically or electrically coupled, may be in communication with each other within two elements, may be directly coupled, or may be indirectly coupled through an intermediary, as would be apparent to one of ordinary skill in the art.
Herein, unless otherwise indicated, the term "plurality" means two or more.
Herein, the character "/" indicates that the front and rear objects are an or relationship. For example, A/B represents: a or B.
Herein, the term "and/or" is an association relation describing an object, meaning that three relations may exist. For example, a and/or B, represent: a or B, or, A and B.
It should be understood that, although the steps in the flowchart are shown in sequence as indicated by the arrows, the steps are not necessarily performed in sequence as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the figures may include multiple sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, nor does the order in which the sub-steps or stages are performed necessarily performed in sequence, but may be performed alternately or alternately with at least a portion of other steps or other steps.
The various modules in the apparatus or system of the present application may be implemented in whole or in part in software, hardware, and combinations thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
Embodiments of the application and features of the embodiments may be combined with each other without conflict.
Fig. 1 shows an embodiment of a battery pack remaining amount calculation method of the present application.
In this alternative embodiment, the method for calculating the remaining battery power includes:
step S101, acquiring a battery pack for acquisition and analysis to obtain dynamic voltage and real-time temperature of the battery pack;
step S103, calculating the residual electric quantity of the battery pack through a pre-configured electric quantity calculation model according to the dynamic voltage and the real-time temperature; the electric quantity calculation model is obtained through training of full-charge voltage, feed voltage and battery temperature compensation coefficient of the battery pack.
Fig. 2 shows an embodiment of the battery pack remaining power calculation system of the present application.
In this alternative embodiment, the battery pack remaining power calculation system includes:
the acquisition and analysis module 201 is used for acquiring a battery pack for acquisition and analysis to obtain the dynamic voltage and the real-time temperature of the battery pack;
the electric quantity calculation module 203 is configured to calculate, according to the dynamic voltage and the real-time temperature, a residual electric quantity of the battery pack through a pre-configured electric quantity calculation model; the electric quantity calculation model is obtained through training of full-charge voltage, feed voltage and battery temperature compensation coefficient of the battery pack.
In practical application, for the collection and analysis module 201, the collection and analysis module may be implemented by a voltage collection unit, where the voltage collection unit includes an operational amplifier OPT, as shown in fig. 3, where the non-inverting input end of the operational amplifier OPT is connected with a first resistor R1, a second resistor R2 and a third resistor R3, the first resistor R1 and the second resistor R2 are connected in series and then connected in parallel with the third resistor R3, the inverting input end of the operational amplifier OPT is connected with the output end of the operational amplifier OPT, and the output end of the operational amplifier OPT is connected with an ADC converter.
In addition, in practical application, taking a 48V/16aH lithium ion battery as an example, the constant current 1C discharge curve of the battery pack at different temperatures is shown in FIG. 4. As can be seen from the figure, the battery pack drops off quickly during discharging, and then the voltage fluctuation is small, and when the electric quantity is about to be exhausted, the voltage cliff occurs. And combining the characteristics and the change of the dynamic voltage of the battery pack, and establishing an electric quantity calculation model.
In addition, in practical application, the calculation formula of the electric quantity calculation model is as follows: residual electric quantity In the formula, VD pack A dynamic voltage for the battery pack; VE (VE) pack A voltage deficient for the battery pack; VF_pack is the full voltage of the battery pack; vt_cell is the battery temperature compensation coefficient of the battery pack. The calculation formula of the full-charge voltage of the battery pack is as follows: vf_pack=vf_cell =n_cell+vt_cell; wherein VF_pack is the full voltage of the battery pack; VF_cell is the full voltage of the single battery of the battery pack; n_cell is the number of single batteries of the battery pack; the VT_cell is a battery temperature compensation coefficient of the battery pack, and the battery temperature compensation coefficient is a voltage compensation value at different working temperatures. The calculation formula of the voltage deficiency of the battery pack is as follows: ve_pack=ve_cell =n_cell+vt_cell; wherein VE_pack is the voltage of the battery pack; ve_cell is the voltage of the battery pack for power shortage of the single battery; n_cell is the number of single batteries of the battery pack; vt_cell is the battery temperature compensation coefficient of the battery pack. The calculation formula of the dynamic voltage of the battery pack is as follows: in the formula, VD pack A dynamic voltage for the battery pack; v (V) t0 The real-time voltage of the battery pack acquired for the first time during each calculation is obtained; v (V) t1 ～V tn The real-time voltage of the battery pack is collected for a fixed time slice; vt_cell is the battery temperature compensation coefficient of the battery pack.
When the battery temperature coefficient VT_cell is specifically used, the voltage compensation value of the battery at different working temperatures is obtained by the relation table of the self temperature and the residual electric quantity SOC of the battery pack according to the voltage value of the battery pack at 25 ℃, and the relation table is as follows:
| SOC | 100 ％ | 95 ％ | 90 ％ | 85 ％ | 80 ％ | 75 ％ | 70 ％ | 65 ％ | 60 ％ | 55 ％ | 50 ％ | 45 ％ | 40 ％ | 35 ％ | 30 ％ | 25 ％ | 20 ％ | 15 ％ | 10 ％ | 5％ | 0％ |
| 40 ℃ voltage (V) | 50. 42 | 48. 31 | 48. 29 | 48. 26 | 48. 21 | 48. 17 | 48. 10 | 48. 02 | 47. 94 | 47. 87 | 47. 80 | 47. 73 | 47. 65 | 47. 54 | 47. 44 | 47. 27 | 47. 01 | 46. 62 | 46. 29 | 45. 74 | 37. 50 |
| Voltage at 25 DEG C (V) | 50. 83 | 48. 87 | 48. 85 | 48. 82 | 48. 78 | 48. 73 | 48. 66 | 48. 56 | 48. 45 | 48. 36 | 48. 28 | 48. 22 | 48. 14 | 48. 06 | 47. 95 | 47. 80 | 47. 56 | 47. 13 | 46. 70 | 46. 24 | 37. 50 |
| Voltage at 0 DEG C (V) | 47. 14 | 45. 21 | 45. 52 | 45. 78 | 45. 99 | 46. 13 | 46. 25 | 46. 33 | 46. 38 | 46. 40 | 46. 40 | 46. 37 | 46. 31 | 46. 22 | 46. 08 | 45. 90 | 45. 61 | 45. 25 | 44. 60 | 42. 85 | 37. 50 |
| Voltage at-5 DEG C (V) | 46. 13 | 44. 17 | 44. 66 | 45. 09 | 45. 40 | 45. 64 | 45. 81 | 45. 94 | 46. 03 | 46. 08 | 46. 10 | 46. 09 | 46. 04 | 45. 96 | 45. 84 | 45. 65 | 45. 37 | 45. 00 | 44. 26 | 42. 80 | 37. 50 |
| -10 ℃ electricity Pressure (V) | 44. 93 | 42. 92 | 43. 65 | 44. 25 | 44. 73 | 45. 07 | 45. 32 | 45. 50 | 45. 64 | 45. 73 | 45. 78 | 45. 79 | 45. 76 | 45. 69 | 45. 57 | 45. 38 | 45. 11 | 44. 67 | 43. 90 | 42. 60 | 37. 50 |
| -15 ℃ electricity Pressure (V) | 43. 22 | 41. 42 | 42. 50 | 43. 34 | 43. 95 | 44. 42 | 44. 77 | 45. 03 | 45. 22 | 45. 35 | 45. 43 | 45. 47 | 45. 60 | 45. 40 | 45. 29 | 45. 10 | 44. 80 | 44. 37 | 43. 62 | 42. 35 | 37. 50 |
For example, the above table calculates vt_cell of the battery pack at 0 ℃ in a full state (i.e., SOC of 100%) as:
VT_cell＝V25_cell-V0_cell
namely:
VT_cell＝50.83V-47.14V
namely:
VT_cell＝3.69V
and calculating the VT_cell at each temperature one by one according to the formula to obtain a VT_cell reference table, wherein the VT_cell reference table is specifically as follows:
| SOC | 100％ | 95％ | 90％ | 85％ | 80％ | 75％ | 70％ | 65％ | 60％ | 55％ | 50％ | 45％ | 40％ | 35％ | 30％ | 25％ | 20％ | 15％ | 10％ | 5％ | 0％ |
| 40 ℃ voltage (V) | 0.41 | 0.56 | 0.56 | 0.56 | 0.57 | 0.56 | 0.56 | 0.54 | 0.51 | 0.49 | 0.48 | 0.49 | 0.49 | 0.52 | 0.51 | 0.53 | 0.55 | 0.51 | 0.41 | 0.50 | 0.00 |
| 25 ℃ voltage (V) | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
| Voltage at 0 deg.c (V) | 3.69 | 3.66 | 3.33 | 3.04 | 2.79 | 2.60 | 2.41 | 2.23 | 2.07 | 1.96 | 1.88 | 1.85 | 1.83 | 1.84 | 1.87 | 1.90 | 1.95 | 1.88 | 2.10 | 3.39 | 0.00 |
| -5 ℃ voltage (V) | 4.70 | 4.70 | 4.19 | 3.73 | 3.38 | 3.09 | 2.85 | 2.62 | 2.42 | 2.28 | 2.18 | 2.13 | 2.10 | 2.10 | 2.11 | 2.15 | 2.19 | 2.13 | 2.44 | 3.44 | 0.00 |
| -10 ℃ voltage (V) | 5.90 | 5.95 | 5.20 | 4.57 | 4.05 | 3.66 | 3.34 | 3.06 | 2.81 | 2.63 | 2.50 | 2.43 | 2.38 | 2.37 | 2.38 | 2.42 | 2.45 | 2.46 | 2.80 | 3.64 | 0.00 |
| -15 ℃ voltage (V) | 7.61 | 7.45 | 6.35 | 5.48 | 4.83 | 4.31 | 3.89 | 3.53 | 3.23 | 3.01 | 2.85 | 2.75 | 2.54 | 2.66 | 2.66 | 2.70 | 2.76 | 2.76 | 3.08 | 3.89 | 0.00 |
In one embodiment, a computer device is provided, which may be a server, the internal structure of which may be as shown in fig. 5. The computer device includes a processor, a memory, and a network interface connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The database of the computer device is used to store static information and dynamic information data. The network interface of the computer device is used for communicating with an external terminal through a network connection. Which computer program, when being executed by a processor, carries out the steps of the above-mentioned method embodiments.
It will be appreciated by those skilled in the art that the structure shown in FIG. 5 is merely a block diagram of some of the structures associated with the present inventive arrangements and is not limiting of the computer device to which the present inventive arrangements may be applied, and that a particular computer device may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.
In an embodiment, a computer device is also provided, comprising a memory and a processor, the memory having stored therein a computer program, the processor performing the steps of the above-described method embodiments when the computer program is executed.
In one embodiment, a computer readable storage medium is provided, on which a computer program is stored which, when executed by a processor, carries out the steps of the method embodiments described above.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, or the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory. By way of illustration, and not limitation, RAM can be in the form of a variety of forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), and the like.
The present application is not limited to the structure that has been described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (10)
1. A method for calculating a remaining battery power of a battery pack, comprising:
acquiring a battery pack for acquisition and analysis to obtain dynamic voltage and real-time temperature of the battery pack;
calculating the residual electric quantity of the battery pack according to the dynamic voltage and the real-time temperature through a pre-configured electric quantity calculation model;
the electric quantity calculation model is obtained through training of full-charge voltage, feed voltage and battery temperature compensation coefficient of the battery pack.
2. The method of claim 1, wherein the calculation formula of the power calculation model is:
residual electric quantity
In the formula, VD pack A dynamic voltage for the battery pack; VE (VE) pack A voltage deficient for the battery pack; VF_pack is the full voltage of the battery pack; vt_cell is the battery temperature compensation coefficient of the battery pack.
3. The method of calculating the remaining battery power of the battery pack according to claim 2, wherein the calculation formula of the full-charge voltage of the battery pack is:
VF_pack＝VF_cell*N_cell+VT_cell
wherein VF_pack is the full voltage of the battery pack; VF_cell is the full voltage of the single battery of the battery pack; n_cell is the number of single batteries of the battery pack; the VT_cell is a battery temperature compensation coefficient of the battery pack, and the battery temperature compensation coefficient is a voltage compensation value at different working temperatures.
4. The method of claim 2, wherein the calculation formula of the battery pack residual voltage is:
VE_pack＝VE_cell*N_cell+VT_cell
wherein VE_pack is the voltage of the battery pack; ve_cell is the voltage of the battery pack for power shortage of the single battery; n_cell is the number of single batteries of the battery pack; vt_cell is the battery temperature compensation coefficient of the battery pack.
5. The method of calculating a remaining battery power of a battery pack according to claim 2, wherein the calculation formula of the dynamic voltage of the battery pack is:
in the formula, VD pack A dynamic voltage for the battery pack; v (V) t0 The real-time voltage of the battery pack acquired for the first time during each calculation is obtained; v (V) t1 ～V tn The real-time voltage of the battery pack is collected for a fixed time slice; vt_cell is the battery temperature compensation coefficient of the battery pack.
6. A battery pack remaining power calculation system, comprising:
the acquisition and analysis module is used for acquiring a battery pack for acquisition and analysis to obtain the dynamic voltage and the real-time temperature of the battery pack;
the electric quantity calculation module is used for calculating the residual electric quantity of the battery pack through a pre-configured electric quantity calculation model according to the dynamic voltage and the real-time temperature; the electric quantity calculation model is obtained through training of full-charge voltage, feed voltage and battery temperature compensation coefficient of the battery pack.
7. The battery pack remaining power calculation system according to claim 6, wherein the calculation formula of the power calculation model is:
residual electric quantity
In the formula, VD pack A dynamic voltage for the battery pack; VE (VE) pack A voltage deficient for the battery pack; VF_pack is the full voltage of the battery pack; vt_cell is the battery temperature compensation coefficient of the battery pack.
8. The battery pack remaining power calculation system according to claim 6, wherein the calculation formula of the full power voltage of the battery pack is:
VF_pack＝VF_cell*N_cell+VT_cell
wherein VF_pack is the full voltage of the battery pack; VF_cell is the full voltage of the single battery of the battery pack; n_cell is the number of single batteries of the battery pack; the VT_cell is a battery temperature compensation coefficient of the battery pack, and the battery temperature compensation coefficient is a voltage compensation value at different working temperatures.
9. The battery pack remaining power calculation system according to claim 6, wherein the calculation formula of the battery pack voltage shortage is:
VE_pack＝VE_cell*N_cell+VT_cell
wherein VE_pack is the voltage of the battery pack; ve_cell is the voltage of the battery pack for power shortage of the single battery; n_cell is the number of single batteries of the battery pack; vt_cell is the battery temperature compensation coefficient of the battery pack.
10. The battery pack remaining power calculation system according to claim 6, wherein the calculation formula of the dynamic voltage of the battery pack is:
in the formula, VD pack A dynamic voltage for the battery pack; v (V) t0 The real-time voltage of the battery pack acquired for the first time during each calculation is obtained; v (V) t1 ～V tn The real-time voltage of the battery pack is collected for a fixed time slice; vt_cell is the battery temperature compensation coefficient of the battery pack.
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