Intelligent control method and system for series-parallel connection of forklift lithium battery pack and medium

Abstract

According to the intelligent control method and system for series-parallel connection of the forklift lithium battery pack and the medium, the series-parallel connection state of the lithium battery pack is adjusted according to the battery mode information of the forklift lithium battery pack; when it is judged that the battery mode information is a power supply output mode, target voltage information and target current information are determined according to the first control operation instruction; when it is judged that the battery mode information is a charging input mode, target voltage information and target current information are determined according to the first electric quantity information; adjusting the series connection state of the lithium batteries according to the target voltage information, and adjusting the working current of the lithium battery pack in a parallel connection mode according to the target current information; the series-parallel connection state of the lithium battery pack is controlled in the power supply process, the power supply voltage and power supply current required by work of the forklift are met, and the use efficiency of the lithium battery pack is improved; the series-parallel connection state of the lithium battery pack is controlled in the charging process, the charging efficiency and the charging safety of the lithium battery pack are controlled, and the service life of a lithium battery is prolonged.

Description

Technical Field

[0001] The present invention relates to the field of battery power supplies, and more specifically, to an intelligent control method, system and medium for series-parallel connection of lithium battery packs for forklifts. Background Art

[0002] Forklift lithium batteries have a higher energy density, about twice that of traditional lead-acid batteries. This means that forklifts can work longer, reducing the need for frequent charging, thereby improving work efficiency. Although forklift lithium batteries have the characteristics of fast charging and a high number of cycles, forklift lithium batteries on the market lack a lithium battery intelligent management system that takes corresponding management measures to ensure the performance, safety and service life of the battery pack.

[0003] The forklift lithium battery pack is composed of multiple lithium batteries in parallel, and the lithium battery series group is composed of multiple lithium batteries in series. By connecting multiple lithium batteries in series to form a series group, the voltage value after the voltage values ​​of each lithium battery are superimposed can be obtained as the voltage value of the lithium battery series group. By connecting multiple lithium battery series groups in parallel, the current value after the current values ​​of each lithium battery series group are superimposed can be obtained as the current value of the forklift lithium battery pack. By controlling the series and parallel connection of the forklift lithium battery pack, the flexibility of the use of the forklift lithium battery is improved.

[0004] Therefore, there is an urgent need for an intelligent control technology for series-parallel connection of forklift lithium battery packs that can improve the use efficiency of forklift lithium batteries and extend their service life. Summary of the invention

[0005] In view of the above problems, the purpose of the present invention is to provide an intelligent control method, system and medium for series-parallel connection of forklift lithium battery packs, which adjusts the series-parallel state of the lithium battery packs according to the battery mode information of the forklift lithium battery packs; when the battery mode information is judged to be a power output mode, the target voltage information and the target current information are determined according to the first control operation instruction; when the battery mode information is judged to be a charging input mode, the target voltage information and the target current information are determined according to the first power information; the series state of the lithium battery is adjusted according to the target voltage information, and the working current of the lithium battery pack is adjusted in parallel according to the target current information; the series-parallel state of the lithium battery pack is controlled during the power supply process to meet the power supply voltage and power supply current required for the forklift to work, and improve the use efficiency of the lithium battery pack; the series-parallel state of the lithium battery pack is controlled during the charging process to control the charging efficiency and charging safety of the lithium battery pack and extend the service life of the lithium battery.

[0006] A first aspect of the present invention provides an intelligent control method for series-parallel connection of a forklift lithium battery pack, the method comprising: Get battery mode information; Determining whether the battery mode information is a power supply output mode; If yes, obtaining a first control operation instruction, and determining target voltage information and target current information according to the first control operation instruction; If not, obtaining first power information, and determining target voltage information and target current information according to the first power information; Adjusting the series connection state of the lithium batteries according to the target voltage information; The operating current of the lithium battery pack is adjusted in parallel according to the target current information.

[0007] In this solution, the series connection state of the lithium batteries is adjusted according to the target voltage information, specifically: When it is determined that the battery mode information is a power supply output mode; Acquiring first voltage information; Obtaining a first voltage sequence according to the first voltage information; Determining a first lithium battery group according to the first voltage sequence and the target voltage information; The corresponding lithium batteries are connected in series according to the first lithium battery group.

[0008] In this solution, the series connection state of the lithium batteries is adjusted according to the target voltage information, specifically: When it is determined that the battery mode information is a charging input mode; Acquiring second voltage information; Obtaining first quantity information according to the second voltage information and the target voltage information; Determining a second lithium battery pack according to the first quantity information; According to the second lithium battery group, corresponding lithium batteries are connected in series.

[0009] In this solution, the operating current of the lithium battery pack is adjusted in parallel according to the target current information, specifically: Acquire first temperature information of the lithium battery pack; Obtaining a first temperature sequence according to the first temperature information; Determining first current ratio information according to the first temperature sequence; The operating current of the lithium battery pack is adjusted according to the first current ratio information and the target current information.

[0010] In this solution, the first control operation instruction is obtained, and the target voltage information and the target current information are determined according to the first control operation instruction, specifically: When it is determined that the battery mode information is a power supply output mode; According to the first control operation instruction, determining whether it is a first motor control instruction; If yes, setting the target voltage information according to the preset first output voltage threshold; If not, setting the target voltage information according to a preset second output voltage threshold; parsing the first control operation instruction to obtain first current information; The target current information is set according to the first current information.

[0011] In this solution, the first power information is obtained, and the target voltage information and the target current information are determined according to the first power information, specifically: When it is determined that the battery mode information is a charging input mode; Setting target voltage information according to preset first charging voltage information; Determining whether the first power information is lower than a preset first power threshold; If yes, setting the target current information according to the set first charging current threshold; If not, determining whether the first power information is lower than a preset second power threshold; If yes, setting the target current information according to the set second charging current threshold; If not, the target current information is set according to the set third charging current threshold.

[0012] A second aspect of the present invention provides an intelligent control system for a forklift lithium battery pack connected in series and in parallel, including an intelligent control method program for a forklift lithium battery pack connected in series and in parallel, wherein the intelligent control method program for a forklift lithium battery pack connected in series and in parallel implements the following steps when executed by the processor: Get battery mode information; Determining whether the battery mode information is a power supply output mode; If yes, obtaining a first control operation instruction, and determining target voltage information and target current information according to the first control operation instruction; If not, obtaining first power information, and determining target voltage information and target current information according to the first power information; Adjusting the series connection state of the lithium batteries according to the target voltage information; The operating current of the lithium battery pack is adjusted in parallel according to the target current information.

[0013] In this solution, the series connection state of the lithium batteries is adjusted according to the target voltage information, specifically: When it is determined that the battery mode information is a power supply output mode; Acquiring first voltage information; Obtaining a first voltage sequence according to the first voltage information; Determining a first lithium battery group according to the first voltage sequence and the target voltage information; The corresponding lithium batteries are connected in series according to the first lithium battery group.

[0014] In this solution, the series connection state of the lithium batteries is adjusted according to the target voltage information, specifically: When it is determined that the battery mode information is a charging input mode; Acquiring second voltage information; Obtaining first quantity information according to the second voltage information and the target voltage information; Determining a second lithium battery pack according to the first quantity information; According to the second lithium battery group, corresponding lithium batteries are connected in series.

[0015] A third aspect of the present invention provides a computer-readable storage medium, which includes a program for an intelligent control method for series-parallel connection of a forklift lithium battery pack. When the program for the intelligent control method for series-parallel connection of a forklift lithium battery pack is executed by a processor, the steps of the intelligent control method for series-parallel connection of a forklift lithium battery pack as described in any one of the above items are implemented.

[0016] The object of the present invention is to provide an intelligent control method, system and medium for series-parallel connection of a forklift lithium battery pack, which adjusts the series-parallel state of the lithium battery pack according to the battery mode information of the forklift lithium battery pack; when the battery mode information is judged to be a power output mode, the target voltage information and the target current information are determined according to a first control operation instruction; when the battery mode information is judged to be a charging input mode, the target voltage information and the target current information are determined according to the first power information; the series state of the lithium battery is adjusted according to the target voltage information, and the working current of the lithium battery pack is adjusted in a parallel manner according to the target current information; the series-parallel state of the lithium battery pack is controlled during the power supply process to meet the power supply voltage and power supply current required for the forklift to work, and improve the use efficiency of the lithium battery pack; the series-parallel state of the lithium battery pack is controlled during the charging process to control the charging efficiency and charging safety of the lithium battery pack and extend the service life of the lithium battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and should not be regarded as limiting the scope.

[0018] Figure 1 A flow chart showing an intelligent control method for series-parallel connection of a forklift lithium battery pack according to the present invention is shown; Figure 2 A flowchart for adjusting the series connection state of lithium batteries in the power supply output mode provided by an embodiment of the present invention is shown; Figure 3 A flowchart for adjusting the series connection state of lithium batteries in a charging input mode provided by an embodiment of the present invention is shown; Figure 4 A block diagram of an intelligent control system for series-parallel connection of lithium battery packs for forklifts according to the present invention is shown. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Unless otherwise defined, all terms (including technical and scientific terms) used in the embodiments of the present invention have the same meanings as commonly understood by those skilled in the art to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless the embodiments of the present invention are explicitly defined in this way.

[0021] The words "first", "second" and similar words used in the embodiments of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "one", "an" or "the" and similar words do not indicate a quantity limitation, but indicate the existence of at least one. Similarly, words such as "include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The steps before or after the method of the embodiment of the present invention are not necessarily carried out in order. On the contrary, various steps can be processed in reverse order or simultaneously. At the same time, other operations can also be added to these processes, or a step or several steps can be removed from these processes.

[0022] In addition, the functional modules in the various embodiments of the present invention may be integrated together to form an independent part, or each module may exist independently, or two or more modules may be integrated to form an independent part.

[0023] Figure 1 A flow chart of an intelligent control method for series-parallel connection of lithium battery packs for forklifts according to the present invention is shown.

[0024] like Figure 1As shown, the first aspect of the present invention discloses an intelligent control method for series-parallel connection of a forklift lithium battery pack, the method comprising: S102, obtaining battery mode information; S104, determining whether the battery mode information is a power supply output mode; S106, if yes, obtain a first control operation instruction, and determine target voltage information and target current information according to the first control operation instruction; S108, if not, obtaining first power information, and determining target voltage information and target current information according to the first power information; S110, adjusting the series connection state of the lithium batteries according to the target voltage information; S112, adjusting the operating current of the lithium battery pack in parallel according to the target current information.

[0025] It should be noted that the battery mode information is the working mode of the forklift lithium battery pack, including a power output mode and a charging input mode, wherein in the power output mode, the lithium battery pack provides power for the operation and work of the forklift, and in the charging input mode, the lithium battery pack is connected to an external power supply for power supplement; the first control operation instruction is a power supply instruction sent by the forklift to the lithium battery pack system, including but not limited to a power supply instruction for controlling the movement of the forklift wheels and a power supply instruction for controlling the operation of the forklift fork arm; the first power information is the remaining power of the forklift lithium battery pack; the target voltage information is the power supply voltage value or the charging voltage value of the forklift lithium battery pack; the target current information is the power supply current value or the charging current value of the forklift lithium battery pack.

[0026] In this embodiment, when it is judged that the battery mode information is a power output mode, the forklift lithium battery pack provides power for the forklift. According to the first control operation instruction of the forklift, the target voltage information and target current information of the required output are analyzed. In practical applications, when the forklift needs to drive the wheels to move, the driving wheel motor usually runs at high voltage and low current; when the forklift needs to drive the fork arm to carry goods, the driving fork arm usually works at low voltage and high current. Therefore, by analyzing the first control operation instruction, the target voltage information and target current information are determined; the series and parallel state of the lithium battery pack is controlled during the power supply process to meet the power supply voltage and power supply current required for the forklift to work, thereby improving the use efficiency of the lithium battery pack. When it is judged that the battery mode information is a charging input mode, the external power supply supplements the forklift lithium battery pack with power. According to the power state of the lithium battery pack, the charging current is adjusted to control the fast charging operation of the lithium battery pack. Finally, according to the set target voltage information, the series connection state of the lithium battery is adjusted to form a number of series groups; then according to the target current information, the working current of each series group is set; the charging process is realized by controlling the series and parallel state of the lithium battery group to control the charging efficiency and charging safety of the lithium battery group and extend the service life of the lithium battery.

[0027] Figure 2 A flow chart for adjusting the series connection state of lithium batteries in the power supply output mode provided by an embodiment of the present invention is shown.

[0028] According to an embodiment of the present invention, Figure 2 As shown, the series connection state of the lithium batteries is adjusted according to the target voltage information, specifically: S202, when it is determined that the battery mode information is a power supply output mode; S204, obtaining first voltage information; S206, obtaining a first voltage sequence according to the first voltage information; S208, determining a first lithium battery group according to the first voltage sequence and the target voltage information; S210: Connect corresponding lithium batteries in series according to the first lithium battery group.

[0029] It should be noted that the first voltage information is the voltage value of each lithium battery; the first voltage sequence is a sequence obtained by arranging the voltage values ​​of all lithium batteries in ascending or descending order; the first lithium battery group is a series combination of lithium batteries in which one voltage value reaches the target voltage information. In this embodiment, according to the voltage value of each lithium battery, they are combined in a set manner so that the first lithium battery group formed in series after the combination can reach the target voltage information. As an implementation method, the lithium battery combination method is to combine the maximum value of the first voltage sequence and several voltage values ​​in the first voltage sequence, and select the minimum value in the combination that exceeds the target voltage information as the first lithium battery group.

[0030] Figure 3 A flow chart for adjusting the series connection state of lithium batteries in a charging input mode provided by an embodiment of the present invention is shown.

[0031] According to an embodiment of the present invention, Figure 3 As shown, the series connection state of the lithium batteries is adjusted according to the target voltage information, specifically: S302, when it is determined that the battery mode information is a charging input mode; S304, obtaining second voltage information; S306, obtaining first quantity information according to the second voltage information and the target voltage information; S308, determining a second lithium battery pack according to the first quantity information; S310: Connect corresponding lithium batteries in series according to the second lithium battery group.

[0032] It should be noted that the second voltage information is the default voltage value when the lithium battery is charged; the first quantity information is the number of lithium batteries in the series group; and the second lithium battery group is a series combination of one of the lithium batteries when charging. In this embodiment, the first quantity information is calculated based on the default charging voltage of each lithium battery and the set target voltage information, and the corresponding number of lithium batteries are connected in series to form a second lithium battery group. When charging, different numbers of lithium batteries are connected in series to adapt to different charging voltages, thereby improving the flexibility of the charging working state.

[0033] According to an embodiment of the present invention, the operating current of the lithium battery pack is adjusted in parallel according to the target current information, specifically: Acquire first temperature information of the lithium battery pack; Obtaining a first temperature sequence according to the first temperature information; Determining first current ratio information according to the first temperature sequence; The operating current of the lithium battery pack is adjusted according to the first current ratio information and the target current information.

[0034] It should be noted that the first temperature information is the temperature value of each lithium battery pack; the first temperature sequence is the temperature sequence obtained by the temperature values ​​of all lithium battery packs in ascending or descending order; the first current ratio information is the current ratio of the power supply output or the current ratio of the charging input of each lithium battery pack. During the charging or discharging process of the lithium battery, the larger the working current of the lithium battery pack, the higher its heat generation. In this embodiment, in order to ensure that the temperature values ​​of each lithium battery pack tend to be the same, the corresponding current ratio is set according to the temperature value of the lithium battery pack, that is, the higher the temperature value of the lithium battery pack, the lower the current required to output or input. As an implementation method, the temperature difference between the temperature value of the lithium battery pack and the standard operating temperature of the lithium battery pack is calculated, and the current ratio is determined according to the temperature difference of each lithium battery pack. Finally, the working current of the lithium battery pack can be obtained based on the current ratio and the target current information.

[0035] According to an embodiment of the present invention, the first control operation instruction is obtained, and the target voltage information and the target current information are determined according to the first control operation instruction, specifically: When it is determined that the battery mode information is a power supply output mode; According to the first control operation instruction, determining whether it is a first motor control instruction; If yes, setting the target voltage information according to the preset first output voltage threshold; If not, setting the target voltage information according to a preset second output voltage threshold; parsing the first control operation instruction to obtain first current information; The target current information is set according to the first current information.

[0036] It should be noted that the first control operation instruction includes but is not limited to a power supply instruction for controlling the movement of the forklift wheel and a power supply instruction for controlling the operation of the forklift fork arm. When it is judged that the first control operation instruction is the first motor control instruction, that is, the power supply instruction for controlling the movement of the forklift wheel, the target voltage information is set according to the working voltage set for the wheel, that is, the first output voltage threshold. Then, as an implementation method, the first current information is obtained by parsing the current value required for the wheel running speed in the first control operation instruction, which is used to set the target current information. When it is judged that the first control operation instruction is the power supply instruction for the operation of the forklift fork arm, the target voltage information is set according to the working voltage set for the fork arm, that is, the second output voltage threshold. Then, as an implementation method, the current value calculated by parsing the first control operation instruction about the working state of the fork arm, including the direction of movement of the fork arm, the weight of the cargo being handled, etc., is used to set the target current information.

[0037] According to an embodiment of the present invention, the first power information is obtained, and the target voltage information and the target current information are determined according to the first power information, specifically: When it is determined that the battery mode information is a charging input mode; Setting target voltage information according to preset first charging voltage information; Determining whether the first power information is lower than a preset first power threshold; If yes, setting the target current information according to the set first charging current threshold; If not, determining whether the first power information is lower than a preset second power threshold; If yes, setting the target current information according to the set second charging current threshold; If not, the target current information is set according to the set third charging current threshold.

[0038] It should be noted that in this embodiment, the charging working mode is set according to the power value of the forklift lithium battery pack, including fast charging mode, standard charging mode and trickle charging mode. When the first power information is lower than the preset first power threshold, it means that the power of the forklift lithium battery pack is at a low level, and the electric energy should be quickly replenished through the fast charging mode; therefore, the target current information is set according to the set first charging current threshold, and a high current method is used to increase the charging speed. When the first power information is higher than the preset first power threshold and lower than the preset second power threshold, it means that the power of the forklift lithium battery pack has reached the set working requirement level. In order to avoid heating or overcharging problems caused by continuous fast charging, the target current information is set according to the set second charging current threshold, and the standard current value is used for charging. When the first power information is higher than the preset second power threshold, it means that the power of the forklift lithium battery pack is sufficient, and the lithium battery can be overcharged by trickle slow charging to extend the service life of the lithium battery.

[0039] It is worth mentioning that it also includes: When it is determined that the battery mode information is a charging input mode; Acquire first temperature information and second current information of the lithium battery pack; Determining a first current upper limit threshold value according to the first temperature information; Determining whether the second current information exceeds a preset first current upper limit threshold; If so, the target voltage information and the target current information are adjusted according to the first current upper limit threshold.

[0040] It should be noted that the second current information is the charging current of any lithium battery pack. When the battery mode information is judged to be the charging input mode, the upper limit of the charging current of the lithium battery pack is determined according to the temperature value of the lithium battery pack, that is, the first upper current threshold; it is used to limit the continuous heating of the lithium battery due to excessive current and reduce the risk of damage to the lithium battery cell due to overheating. When the second current information exceeds the first upper current threshold, it means that there is a risk of continuous heating and temperature rise. At this time, the target charging voltage and target charging current of the forklift lithium battery pack are readjusted according to the first upper current threshold to ensure the safety of charging.

[0041] It is worth mentioning that it also includes: When the battery mode information is the power supply output mode When the first control operation instruction is determined to be a second motor control instruction; Acquire first power information; Determining whether the first power information is lower than a preset fourth power threshold; If yes, setting the target voltage information according to the preset second output voltage threshold; According to the target voltage information, the series connection state of all lithium batteries is adjusted.

[0042] It should be noted that the second motor control instruction is a power supply instruction for the forklift fork arm. In practical applications, a large power supply current is usually required in the process of the fork arm carrying goods. Therefore, in order to ensure the continuity of the current supply and avoid the fork arm failure due to insufficient power, in this embodiment, it is determined whether the first power information is lower than the preset fourth power threshold. If so, it means that the power of the forklift lithium battery pack is at a set critical level. At this time, all lithium batteries are connected in series according to the target voltage information to form the largest number of series groups, and each series group is connected in parallel to ensure that the power supply current meets the working requirements of the fork arm.

[0043] It is worth mentioning that it also includes: Get charging record information; Obtaining first charging ratio information according to the charging record information; Determining whether the first charging ratio information exceeds a preset first charging ratio threshold; If yes, then increase the first charging current threshold; If not, determining whether the first charging ratio information is lower than a preset second charging ratio threshold; If so, the first charging current threshold is lowered.

[0044] It should be noted that in the present embodiment, the ratio of the charging power and the charging time is calculated according to the charging record to obtain the first charging ratio information, which is used to indicate the user's charging habits. If the first charging ratio information is high, it means that the user is accustomed to replenishing a large amount of electrical energy in a short time. When the first charging ratio information exceeds the preset first charging ratio threshold, it means that the user's short-term charging demand is high, so the first charging current threshold is increased, that is, the charging current in the fast charging mode is increased to increase the charging speed. When the first charging ratio information is lower than the preset second charging ratio threshold, it means that the user is accustomed to charging for a long time. In order to reduce the impact of rapid energy replenishment on the battery cells, the charging current in the fast charging mode is reduced to increase the service life of the lithium battery.

[0045] Figure 4 A block diagram of an intelligent control system for series-parallel connection of lithium battery packs for forklifts according to the present invention is shown.

[0046] like Figure 4 As shown, the second aspect of the present invention discloses an intelligent control system 4 for a forklift lithium battery group connected in series and in parallel, comprising a memory 41 and a processor 42, wherein the memory comprises an intelligent control method program for a forklift lithium battery group connected in series and in parallel, and when the intelligent control method program for a forklift lithium battery group connected in series and in parallel is executed by the processor, the following steps are implemented: Get battery mode information; Determining whether the battery mode information is a power supply output mode; If yes, obtaining a first control operation instruction, and determining target voltage information and target current information according to the first control operation instruction; If not, obtaining first power information, and determining target voltage information and target current information according to the first power information; Adjusting the series connection state of the lithium batteries according to the target voltage information; The operating current of the lithium battery pack is adjusted in parallel according to the target current information.

[0047] It should be noted that the battery mode information is the working mode of the forklift lithium battery pack, including a power output mode and a charging input mode, wherein in the power output mode, the lithium battery pack provides power for the operation and work of the forklift, and in the charging input mode, the lithium battery pack is connected to an external power supply for power supplement; the first control operation instruction is a power supply instruction sent by the forklift to the lithium battery pack system, including but not limited to a power supply instruction for controlling the movement of the forklift wheels and a power supply instruction for controlling the operation of the forklift fork arm; the first power information is the remaining power of the forklift lithium battery pack; the target voltage information is the power supply voltage value or the charging voltage value of the forklift lithium battery pack; the target current information is the power supply current value or the charging current value of the forklift lithium battery pack.

[0048] In this embodiment, when it is judged that the battery mode information is a power output mode, the forklift lithium battery pack provides power for the forklift. According to the first control operation instruction of the forklift, the target voltage information and target current information of the required output are analyzed. In practical applications, when the forklift needs to drive the wheels to move, the driving wheel motor usually runs at high voltage and low current; when the forklift needs to drive the fork arm to carry goods, the driving fork arm usually works at low voltage and high current. Therefore, by analyzing the first control operation instruction, the target voltage information and target current information are determined; the series and parallel state of the lithium battery pack is controlled during the power supply process to meet the power supply voltage and power supply current required for the forklift to work, thereby improving the use efficiency of the lithium battery pack. When it is judged that the battery mode information is a charging input mode, the external power supply supplements the forklift lithium battery pack with power. According to the power state of the lithium battery pack, the charging current is adjusted to control the fast charging operation of the lithium battery pack. Finally, according to the set target voltage information, the series connection state of the lithium battery is adjusted to form a number of series groups; then according to the target current information, the working current of each series group is set; the charging process is realized by controlling the series and parallel state of the lithium battery group to control the charging efficiency and charging safety of the lithium battery group and extend the service life of the lithium battery.

[0049] According to an embodiment of the present invention, adjusting the series connection state of the lithium batteries according to the target voltage information is specifically as follows: When it is determined that the battery mode information is a power supply output mode; Acquiring first voltage information; Obtaining a first voltage sequence according to the first voltage information; Determining a first lithium battery group according to the first voltage sequence and the target voltage information; The corresponding lithium batteries are connected in series according to the first lithium battery group.

[0050] It should be noted that the first voltage information is the voltage value of each lithium battery; the first voltage sequence is a sequence obtained by arranging the voltage values ​​of all lithium batteries in ascending or descending order; the first lithium battery group is a series combination of lithium batteries in which one voltage value reaches the target voltage information. In this embodiment, according to the voltage value of each lithium battery, they are combined in a set manner so that the first lithium battery group formed in series after the combination can reach the target voltage information. As an implementation method, the lithium battery combination method is to combine the maximum value of the first voltage sequence and several voltage values ​​in the first voltage sequence, and select the minimum value in the combination that exceeds the target voltage information as the first lithium battery group.

[0051] According to an embodiment of the present invention, adjusting the series connection state of the lithium batteries according to the target voltage information is specifically as follows: When it is determined that the battery mode information is a charging input mode; Acquiring second voltage information; Obtaining first quantity information according to the second voltage information and the target voltage information; Determining a second lithium battery pack according to the first quantity information; According to the second lithium battery group, corresponding lithium batteries are connected in series.

[0052] It should be noted that the second voltage information is the default voltage value when the lithium battery is charged; the first quantity information is the number of lithium batteries in the series group; and the second lithium battery group is a series combination of one of the lithium batteries when charging. In this embodiment, the first quantity information is calculated based on the default charging voltage of each lithium battery and the set target voltage information, and the corresponding number of lithium batteries are connected in series to form a second lithium battery group. When charging, different numbers of lithium batteries are connected in series to adapt to different charging voltages, thereby improving the flexibility of the charging working state.

[0053] According to an embodiment of the present invention, the operating current of the lithium battery pack is adjusted in parallel according to the target current information, specifically: Acquire first temperature information of the lithium battery pack; Obtaining a first temperature sequence according to the first temperature information; Determining first current ratio information according to the first temperature sequence; The operating current of the lithium battery pack is adjusted according to the first current ratio information and the target current information.

[0054] It should be noted that the first temperature information is the temperature value of each lithium battery pack; the first temperature sequence is the temperature sequence obtained by the temperature values ​​of all lithium battery packs in ascending or descending order; the first current ratio information is the current ratio of the power supply output or the current ratio of the charging input of each lithium battery pack. During the charging or discharging process of the lithium battery, the larger the working current of the lithium battery pack, the higher its heat generation. In this embodiment, in order to ensure that the temperature values ​​of each lithium battery pack tend to be the same, the corresponding current ratio is set according to the temperature value of the lithium battery pack, that is, the higher the temperature value of the lithium battery pack, the lower the current required to output or input. As an implementation method, the temperature difference between the temperature value of the lithium battery pack and the standard operating temperature of the lithium battery pack is calculated, and the current ratio is determined according to the temperature difference of each lithium battery pack. Finally, the working current of the lithium battery pack can be obtained based on the current ratio and the target current information.

[0055] According to an embodiment of the present invention, the first control operation instruction is obtained, and the target voltage information and the target current information are determined according to the first control operation instruction, specifically: When it is determined that the battery mode information is a power supply output mode; According to the first control operation instruction, determining whether it is a first motor control instruction; If yes, setting the target voltage information according to the preset first output voltage threshold; If not, setting the target voltage information according to a preset second output voltage threshold; parsing the first control operation instruction to obtain first current information; The target current information is set according to the first current information.

[0056] It should be noted that the first control operation instruction includes but is not limited to a power supply instruction for controlling the movement of the forklift wheel and a power supply instruction for controlling the operation of the forklift fork arm. When it is judged that the first control operation instruction is the first motor control instruction, that is, the power supply instruction for controlling the movement of the forklift wheel, the target voltage information is set according to the working voltage set for the wheel, that is, the first output voltage threshold. Then, as an implementation method, the first current information is obtained by parsing the current value required for the wheel running speed in the first control operation instruction, which is used to set the target current information. When it is judged that the first control operation instruction is the power supply instruction for the operation of the forklift fork arm, the target voltage information is set according to the working voltage set for the fork arm, that is, the second output voltage threshold. Then, as an implementation method, the current value calculated by parsing the first control operation instruction about the working state of the fork arm, including the direction of movement of the fork arm, the weight of the cargo being handled, etc., is used to set the target current information.

[0057] According to an embodiment of the present invention, the first power information is obtained, and the target voltage information and the target current information are determined according to the first power information, specifically: When it is determined that the battery mode information is a charging input mode; Setting target voltage information according to preset first charging voltage information; Determining whether the first power information is lower than a preset first power threshold; If yes, setting the target current information according to the set first charging current threshold; If not, determining whether the first power information is lower than a preset second power threshold; If yes, setting the target current information according to the set second charging current threshold; If not, the target current information is set according to the set third charging current threshold.

[0058] It should be noted that in this embodiment, the charging working mode is set according to the power value of the forklift lithium battery pack, including fast charging mode, standard charging mode and trickle charging mode. When the first power information is lower than the preset first power threshold, it means that the power of the forklift lithium battery pack is at a low level, and the electric energy should be quickly replenished through the fast charging mode; therefore, the target current information is set according to the set first charging current threshold, and a high current method is used to increase the charging speed. When the first power information is higher than the preset first power threshold and lower than the preset second power threshold, it means that the power of the forklift lithium battery pack has reached the set working requirement level. In order to avoid heating or overcharging problems caused by continuous fast charging, the target current information is set according to the set second charging current threshold, and the standard current value is used for charging. When the first power information is higher than the preset second power threshold, it means that the power of the forklift lithium battery pack is sufficient, and the lithium battery can be overcharged by trickle slow charging to extend the service life of the lithium battery.

[0059] It is worth mentioning that it also includes: When it is determined that the battery mode information is a charging input mode; Acquire first temperature information and second current information of the lithium battery pack; Determining a first current upper limit threshold value according to the first temperature information; Determining whether the second current information exceeds a preset first current upper limit threshold; If so, the target voltage information and the target current information are adjusted according to the first current upper limit threshold.

[0060] It should be noted that the second current information is the charging current of any lithium battery pack. When the battery mode information is judged to be the charging input mode, the upper limit of the charging current of the lithium battery pack is determined according to the temperature value of the lithium battery pack, that is, the first upper current threshold; it is used to limit the continuous heating of the lithium battery due to excessive current and reduce the risk of damage to the lithium battery cell due to overheating. When the second current information exceeds the first upper current threshold, it means that there is a risk of continuous heating and temperature rise. At this time, the target charging voltage and target charging current of the forklift lithium battery pack are readjusted according to the first upper current threshold to ensure the safety of charging.

[0061] It is worth mentioning that it also includes: When the battery mode information is the power supply output mode When the first control operation instruction is determined to be a second motor control instruction; Acquire first power information; Determining whether the first power information is lower than a preset fourth power threshold; If yes, setting the target voltage information according to the preset second output voltage threshold; According to the target voltage information, the series connection state of all lithium batteries is adjusted.

[0062] It should be noted that the second motor control instruction is a power supply instruction for the forklift fork arm. In practical applications, a large power supply current is usually required in the process of the fork arm carrying goods. Therefore, in order to ensure the continuity of the current supply and avoid the fork arm failure due to insufficient power, in this embodiment, it is determined whether the first power information is lower than the preset fourth power threshold. If so, it means that the power of the forklift lithium battery pack is at a set critical level. At this time, all lithium batteries are connected in series according to the target voltage information to form the largest number of series groups, and each series group is connected in parallel to ensure that the power supply current meets the working requirements of the fork arm.

[0063] It is worth mentioning that it also includes: Get charging record information; Obtaining first charging ratio information according to the charging record information; Determining whether the first charging ratio information exceeds a preset first charging ratio threshold; If yes, then increase the first charging current threshold; If not, determining whether the first charging ratio information is lower than a preset second charging ratio threshold; If so, the first charging current threshold is lowered.

[0064] It should be noted that in the present embodiment, the ratio of the charging power and the charging time is calculated according to the charging record to obtain the first charging ratio information, which is used to indicate the user's charging habits. If the first charging ratio information is high, it means that the user is accustomed to replenishing a large amount of electrical energy in a short time. When the first charging ratio information exceeds the preset first charging ratio threshold, it means that the user's short-term charging demand is high, so the first charging current threshold is increased, that is, the charging current in the fast charging mode is increased to increase the charging speed. When the first charging ratio information is lower than the preset second charging ratio threshold, it means that the user is accustomed to charging for a long time. In order to reduce the impact of rapid energy replenishment on the battery cells, the charging current in the fast charging mode is reduced to increase the service life of the lithium battery.

[0065] A third aspect of the present invention provides a computer-readable storage medium, which includes a program for an intelligent control method for series-parallel connection of a forklift lithium battery pack. When the program for the intelligent control method for series-parallel connection of a forklift lithium battery pack is executed by a processor, the steps of the intelligent control method for series-parallel connection of a forklift lithium battery pack as described in any one of the above items are implemented.

[0066] The object of the present invention is to provide an intelligent control method, system and medium for series-parallel connection of a forklift lithium battery pack, which adjusts the series-parallel state of the lithium battery pack according to the battery mode information of the forklift lithium battery pack; when the battery mode information is judged to be a power output mode, the target voltage information and the target current information are determined according to a first control operation instruction; when the battery mode information is judged to be a charging input mode, the target voltage information and the target current information are determined according to the first power information; the series state of the lithium battery is adjusted according to the target voltage information, and the working current of the lithium battery pack is adjusted in a parallel manner according to the target current information; the series-parallel state of the lithium battery pack is controlled during the power supply process to meet the power supply voltage and power supply current required for the forklift to work, and improve the use efficiency of the lithium battery pack; the series-parallel state of the lithium battery pack is controlled during the charging process to control the charging efficiency and charging safety of the lithium battery pack and extend the service life of the lithium battery.

[0067] If the functions are implemented in the form of software function 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 the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, and other media that can store program codes.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An intelligent control method for series-parallel connection of lithium battery packs for forklifts, characterized in that: The method comprises: Get battery mode information; Determining whether the battery mode information is a power supply output mode; If yes, obtaining a first control operation instruction, and determining target voltage information and target current information according to the first control operation instruction; If not, obtaining first power information, and determining target voltage information and target current information according to the first power information; Adjusting the series connection state of the lithium batteries according to the target voltage information; The operating current of the lithium battery pack is adjusted in parallel according to the target current information.

2. The intelligent control method for series-parallel connection of forklift lithium battery packs according to claim 1, characterized in that: The adjusting the series connection state of the lithium batteries according to the target voltage information is specifically as follows: When it is determined that the battery mode information is a power supply output mode; Acquiring first voltage information; Obtaining a first voltage sequence according to the first voltage information; Determining a first lithium battery group according to the first voltage sequence and the target voltage information; The corresponding lithium batteries are connected in series according to the first lithium battery group.

3. The intelligent control method for series-parallel connection of forklift lithium battery packs according to claim 1, characterized in that: The adjusting the series connection state of the lithium batteries according to the target voltage information is specifically as follows: When it is determined that the battery mode information is a charging input mode; Acquiring second voltage information; Obtaining first quantity information according to the second voltage information and the target voltage information; Determining a second lithium battery pack according to the first quantity information; According to the second lithium battery group, corresponding lithium batteries are connected in series.

4. The intelligent control method for series-parallel connection of forklift lithium battery packs according to claim 1, characterized in that: The operating current of the lithium battery pack is adjusted in parallel according to the target current information, specifically: Acquire first temperature information of the lithium battery pack; Obtaining a first temperature sequence according to the first temperature information; Determining first current ratio information according to the first temperature sequence; The operating current of the lithium battery pack is adjusted according to the first current ratio information and the target current information.

5. The intelligent control method for series-parallel connection of forklift lithium battery packs according to claim 1, characterized in that: The first control operation instruction is obtained, and the target voltage information and the target current information are determined according to the first control operation instruction, specifically: When it is determined that the battery mode information is a power supply output mode; According to the first control operation instruction, determining whether it is a first motor control instruction; If yes, setting the target voltage information according to the preset first output voltage threshold; If not, setting the target voltage information according to a preset second output voltage threshold; parsing the first control operation instruction to obtain first current information; The target current information is set according to the first current information.

6. The intelligent control method for series-parallel connection of forklift lithium battery packs according to claim 1, characterized in that: The first power information is obtained, and the target voltage information and the target current information are determined according to the first power information, specifically: When it is determined that the battery mode information is a charging input mode; Setting target voltage information according to preset first charging voltage information; Determining whether the first power information is lower than a preset first power threshold; If yes, setting the target current information according to the set first charging current threshold; If not, determining whether the first power information is lower than a preset second power threshold; If yes, setting the target current information according to the set second charging current threshold; If not, the target current information is set according to the set third charging current threshold.

7. An intelligent control system for series-parallel connection of lithium battery packs for forklifts, characterized in that: The system includes a memory and a processor, wherein the memory includes an intelligent control method program for connecting a forklift lithium battery pack in series and parallel, and when the intelligent control method program for connecting a forklift lithium battery pack in series and parallel is executed by the processor, the following steps are implemented: Get battery mode information; Determining whether the battery mode information is a power supply output mode; If yes, obtaining a first control operation instruction, and determining target voltage information and target current information according to the first control operation instruction; If not, obtaining first power information, and determining target voltage information and target current information according to the first power information; Adjusting the series connection state of the lithium batteries according to the target voltage information; The operating current of the lithium battery pack is adjusted in parallel according to the target current information.

8. The intelligent control system for series-parallel connection of lithium battery packs for forklifts according to claim 7, characterized in that: The adjusting the series connection state of the lithium batteries according to the target voltage information is specifically as follows: When it is determined that the battery mode information is a power supply output mode; Acquiring first voltage information; Obtaining a first voltage sequence according to the first voltage information; Determining a first lithium battery group according to the first voltage sequence and the target voltage information; The corresponding lithium batteries are connected in series according to the first lithium battery group.

9. The intelligent control system for series-parallel connection of lithium battery packs for forklifts according to claim 7, characterized in that: The adjusting the series connection state of the lithium batteries according to the target voltage information is specifically as follows: When it is determined that the battery mode information is a charging input mode; Acquiring second voltage information; Obtaining first quantity information according to the second voltage information and the target voltage information; Determining a second lithium battery pack according to the first quantity information; According to the second lithium battery group, corresponding lithium batteries are connected in series.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: The computer-readable storage medium includes a program for an intelligent control method for series-parallel connection of a forklift lithium battery pack. When the program for the intelligent control method for series-parallel connection of a forklift lithium battery pack is executed by a processor, the steps of the intelligent control method for series-parallel connection of a forklift lithium battery pack as described in any one of claims 1 to 6 are implemented.

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