Control method and control device of battery assembly and forklift

Abstract

The invention provides a control method and device of a battery pack and a forklift, and relates to the technical field of forklift equipment, the control method of the battery pack comprises the steps that the current running state of the battery pack and the current temperature data of the battery pack are obtained, and the running state comprises charging, discharging or standing; the difference value between the current temperature data and a corresponding preset temperature threshold value in the operation state is determined, and a temperature adjusting circuit is controlled to adjust the operation temperature of the battery pack according to a preset strategy; wherein when the temperature signal is lower than a preset temperature threshold value, the battery pack is heated, and when the temperature signal is higher than the preset temperature threshold value, the battery pack is cooled. The temperature of the battery pack in the operation process can be well controlled, so that the service life of the battery is prolonged, and the operation efficiency of the forklift is improved.

Description

Technical Field

[0001] The present application relates to the technical field of forklift equipment, and in particular to a control method and a control device for a battery assembly and a forklift. Background Art

[0002] During forklift operation, the battery is the source of power, and its performance is directly related to the operating efficiency and safety of the forklift. However, during the charging and discharging process, the battery will generate heat. If not properly controlled, excessive battery temperature may cause performance degradation and even lead to safety accidents. In a low temperature environment, the chemical reaction rate of the battery will slow down, resulting in a decrease in output power, affecting the normal operation of the forklift.

[0003] At present, the method of controlling high temperature of forklift batteries mainly relies on natural heat dissipation or simple fan heat dissipation technology, and in low temperature conditions, direct heating measures are taken. These methods are not effective enough to deal with temperature fluctuations under complex working conditions, resulting in shortened battery life and reduced forklift operating efficiency. Summary of the invention

[0004] The main purpose of the present invention is to provide a control method for a battery assembly, aiming to control the battery temperature, extend the battery life, and improve the operating efficiency of a forklift.

[0005] To achieve the above object, the present invention provides a control method for a battery assembly, wherein the battery assembly is applied to a forklift, the battery assembly comprises a battery pack, a temperature detection circuit for detecting current temperature data of the battery pack, and a temperature adjustment circuit for adjusting the temperature of the battery pack, and the control method comprises: Acquire the current operating state of the battery pack and the current temperature data of the battery pack, wherein the operating state includes charging, discharging or standing still; Determine the difference between the current temperature data and the preset temperature threshold value corresponding to the operating state, and control the temperature adjustment circuit to adjust the operating temperature of the battery pack according to a preset strategy; When the temperature signal is lower than a preset temperature threshold, the battery pack is heated, and when the temperature signal is higher than the preset temperature threshold, the battery pack is cooled.

[0006] Optionally, the temperature detection circuit includes a plurality of temperature sensors; the plurality of temperature sensors are arranged on the outside of the battery pack and on each battery cell of the battery pack; the temperature adjustment circuit is arranged corresponding to the position of the temperature sensor; The specific steps of obtaining the current temperature data of the battery pack are as follows: Acquire first temperature data of the outer side of the battery pack and second temperature data of each of the battery cells; The determining a difference between the current temperature data and a preset temperature threshold value corresponding to the operating state, and controlling the temperature regulating circuit to adjust the operating temperature of the battery pack according to a preset strategy, includes: According to the current operating state of the battery pack, the difference between the first temperature data, the second temperature data and a preset temperature threshold is determined respectively, and the corresponding temperature adjustment circuit action is controlled according to a preset strategy to adjust the operating temperature of the battery pack.

[0007] Optionally, the temperature control circuit includes a plurality of power fans; the plurality of power fans are distributed at a plurality of positions of the battery pack; The determining a difference between the current temperature data and a preset temperature threshold value corresponding to the operating state, and controlling the temperature regulating circuit to adjust the operating temperature of the battery pack according to a preset strategy, includes: Obtaining the corresponding heat dissipation of the power fan at different powers to generate a power-heat mapping table; Determine the corresponding over-temperature position and the exceeded temperature value according to the difference between the first temperature data, the second temperature data and a preset temperature threshold; Determining the excess heat corresponding to the excess temperature value; According to the over-temperature position and the excess heat, the power fan at the corresponding position is controlled to rotate according to the power corresponding to the power-heat mapping table to dissipate the heat at the over-temperature position.

[0008] Optionally, the temperature control circuit includes a plurality of battery heating components; each of the battery cells is provided with at least one battery heating component; The determining a difference between the current temperature data and a preset temperature threshold value corresponding to the operating state, and controlling the temperature regulating circuit to adjust the operating temperature of the battery pack according to a preset strategy, includes: Determine a battery cell temperature difference corresponding to each battery cell according to the second temperature data and the preset temperature threshold; The battery heating components at the corresponding positions of the battery cells are controlled to heat the battery cells according to the corresponding battery cell temperature differences until the temperature of the battery cells reaches a preset temperature threshold.

[0009] Optionally, the battery assembly includes a charging contactor, the input end of the charging contactor is used to connect to an external power source, and the output end of the charging contactor is used to be electrically connected to the battery pack; The determining a difference between the current temperature data and a preset temperature threshold value corresponding to the operating state, and controlling the temperature regulating circuit to adjust the operating temperature of the battery pack according to a preset strategy, includes: Obtaining the current first power data of the battery pack; When the first power data is lower than a preset power threshold, obtaining current third temperature data of the battery pack; After adjusting the current temperature data to a preset temperature threshold, the charging contactor is controlled to be turned on according to a preset charging power to charge the battery pack; Continuously acquiring second power data at a preset interval, and acquiring fourth temperature data of the battery pack, and determining a charging temperature difference between the fourth temperature data and a temperature threshold corresponding to the second power data; The temperature regulating circuit is controlled to regulate the temperature of the battery pack according to the charging temperature difference.

[0010] Optionally, controlling the charging contactor to be turned on according to a preset charging power to charge the battery pack specifically comprises: Obtain the upper limit voltage of each battery cell, the maximum input current of each battery cell, the voltage data of the external power supply, and the current data of the external power supply; Calculating the optimal charging power output by the charging contactor according to the upper limit voltage, the maximum input current, the voltage data of the external power supply, and the current data of the external power supply; According to the optimal charging power, the charging contactor is controlled to be turned on to charge the battery pack.

[0011] Optionally, the battery assembly includes a discharge contactor, the input end of the discharge contactor is connected to the battery pack, and the output end of the discharge contactor is used to connect to a load; The determining a difference between the current temperature data and a preset temperature threshold value corresponding to the operating state, and controlling the temperature regulating circuit to adjust the operating temperature of the battery pack according to a preset strategy, includes: When the operating state is discharging, obtaining a current first discharge temperature of the battery pack; adjusting the first discharge temperature to within the first preset discharge temperature threshold, and controlling the discharge contactor to be turned on, so as to supply power in the battery pack to the load; Continuously obtaining a second discharge temperature during the discharge process of the battery pack; When the second discharge temperature exceeds the first preset discharge temperature threshold, the temperature regulating circuit is controlled to dissipate heat from the battery pack, and when the discharge temperature of the battery pack exceeds the second preset discharge temperature threshold, the discharge contactor is controlled to be turned off, and the battery pack stops supplying power to the load; Wherein, the second preset discharge temperature threshold is greater than the first preset discharge temperature threshold.

[0012] Optionally, the control method further includes: Get the user's operation instructions on the operation panel; According to the operation instruction, the operating temperature and operating status of the battery pack are displayed, or the value of the preset temperature threshold is adjusted or the action of the temperature adjustment circuit is controlled.

[0013] In addition, to achieve the above-mentioned purpose, the present invention also provides a control device, which includes: a memory, a processor, and a control program of a battery component stored in the memory and executable on the processor, wherein the control program of the battery component is configured to implement the control method of the battery component as described above.

[0014] In addition, to achieve the above object, the present invention also provides a forklift, comprising the control device as described above.

[0015] The embodiment of the present invention obtains the current operating state of the battery pack and the current temperature data of the battery pack, determines the difference between the current temperature data and the preset temperature threshold value corresponding to the operating state, controls the temperature control circuit to adjust the operating temperature of the battery pack according to the preset strategy, heats the battery pack when the temperature signal is lower than the preset temperature threshold value, and dissipates the heat of the battery pack when the temperature signal is higher than the preset temperature threshold value. The temperature of the battery pack during operation can be better controlled, thereby extending the battery life and improving the operating efficiency of the forklift. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 is a schematic flow chart of a control method for a battery assembly according to an embodiment of the present invention; Figure 2 A schematic flow chart of a control method for a battery assembly according to another embodiment of the present invention; Figure 3 A schematic flow chart of a control method for a battery assembly according to another embodiment of the present invention; Figure 4 A schematic flow chart of a control method for a battery assembly according to another embodiment of the present invention; Figure 5 A schematic flow chart of a control method for a battery assembly according to another embodiment of the present invention; Figure 6A schematic flow chart of a control method for a battery assembly according to another embodiment of the present invention; Figure 7 A schematic flow chart of a control method for a battery assembly according to another embodiment of the present invention; Figure 8 The figure is a flow chart of a control method for a battery assembly according to another embodiment of the present invention.

[0019] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0020] 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, and the well-known modules, units and their connections, links, communications or operations are not shown or described in detail. In addition, the described features, architectures or functions can be combined in any way in one or more embodiments. It should be understood by those skilled in the art that the various embodiments described below are only for illustration and not for limiting the scope of protection of the present invention. It can also be easily understood that the modules or units or processing methods in the various embodiments described herein and shown in the drawings can be combined and designed according to various different configurations. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0021] The limitations of various nouns or methods referred to in the following embodiments, except for those that are logically untenable, are generally based on the broad concepts that can be implemented under the premise of the disclosure in the embodiments. Under such understanding, the various specific subordinate specific limitations of the nouns or methods should be regarded as the inventive content of the present invention, and should not be understood narrowly or interpreted in a biased manner on the grounds that the specification does not disclose the specific limitations. Similarly, under the premise that it can be implemented logically, the order of the steps in the method is flexible and changeable, and the specific subordinate specific limitations in the broad concepts of various nouns or methods all fall within the scope of protection of the present invention.

[0022] The main solution of the embodiment of the present application is: by obtaining the current operating status of the battery pack and the current temperature data of the battery pack, and then determining the difference between the current temperature data and the preset temperature threshold corresponding to the operating status, and controlling the temperature control circuit according to the preset strategy to adjust the operating temperature of the battery pack, and heating the battery pack when the temperature signal is lower than the preset temperature threshold, and dissipating the heat of the battery pack when the temperature signal is higher than the preset temperature threshold.

[0023] In this embodiment, for the convenience of description, the following description is made with the control device as the execution subject.

[0024] The existing methods of controlling high temperature of forklift batteries mainly rely on natural heat dissipation or simple fan heat dissipation technology, and direct heating measures are adopted in low temperature conditions. These methods are not effective enough to deal with temperature fluctuations under complex working conditions, resulting in shortened battery life and reduced forklift operating efficiency.

[0025] The present application provides a solution that can better control the temperature of the battery pack during operation, thereby extending the battery life and improving the operating efficiency of the forklift.

[0026] To this end, the present invention proposes a control method for a battery assembly; it can be understood that a control device for storing and executing the following method is provided in the forklift, and the control device can be implemented by a main controller, such as MCU (Microcontroller Unit), DSP (Digital Signal Process), FPGA (Field Programmable Gate Array), SOC (System On Chip), etc.

[0027] It can be understood that the battery assembly of this embodiment is applied to a forklift, and the battery assembly includes a battery pack, a temperature detection circuit for detecting current temperature data of the battery pack, and a temperature adjustment circuit for adjusting the temperature of the battery pack.

[0028] Reference Figure 1 In one embodiment of the present invention, the control method of the battery assembly includes steps S100-S200, wherein: S100, obtaining the current operating state of the battery pack and the current temperature data of the battery pack; S200, determine the difference between the current temperature data and the corresponding preset temperature threshold under the operating state, and control the temperature control circuit to adjust the operating temperature of the battery pack according to the preset strategy; wherein, when the temperature signal is lower than the preset temperature threshold, the battery pack is heated, and when the temperature signal is higher than the preset temperature threshold, the battery pack is cooled.

[0029] In this embodiment, the operating state may include charging, discharging or standing still, and the temperature data may include the temperature values ​​of various points inside the battery to accurately monitor and respond to temperature differences at different locations. After obtaining comprehensive temperature data, the control device will analyze the data to determine the hot spots (i.e., areas with higher temperatures) and cold spots (i.e., areas with lower temperatures) in the battery pack. For hot spots, the control device will not only increase the heat dissipation intensity, but may also adjust the distribution of current in the battery pack to reduce the charging or discharging power in the area to avoid performance degradation or safety hazards caused by overheating.

[0030] As for cold spots, especially in low temperature environments, the control device will give priority to heating them to ensure uniform temperature distribution within the battery pack and prevent battery capacity reduction and cycle life shortening due to local low temperatures. This precise temperature control strategy can not only effectively improve the overall performance of the battery pack, but also significantly extend its service life.

[0031] In addition, considering the heat generation and consumption characteristics of the battery pack under different operating conditions, the control method will also dynamically adjust the preset temperature threshold according to the current state of the battery pack. For example, during the charging process, due to the active chemical reaction inside the battery, a lot of heat is generated. At this time, the control device may appropriately increase the preset temperature threshold to reduce unnecessary heat dissipation operations and improve charging efficiency. On the contrary, in the discharge or static state, the control device will tend to lower the preset temperature threshold to ensure that the battery pack operates within a safe temperature range.

[0032] In addition, since the battery assembly of this embodiment is applied to forklift batteries, that is, the control method of the battery assembly is also applied to the forklift environment, the particularity of forklift operation and environmental factors need to be considered in the actual application process. When a forklift is operating in a warehouse, factory or other environment, it may face frequent starting, stopping, acceleration and deceleration, and these operations will generate different loads and heat on the battery pack. And these heats will have a significant impact on the performance and life of the battery assembly.

[0033] In actual application, for example, the battery pack is in the charging state at this time, and the current temperature of the battery pack is 10°C. When the preset temperature threshold for entering the charging state is set to 26°C, the control device will first analyze the difference between the temperature data and the preset temperature threshold (26°C). Since the current battery pack temperature is 10°C, which is much lower than the preset charging temperature threshold, the control device will preset a strategy to control the temperature control circuit to heat the battery pack so that the battery can reach a temperature of at least 26°C, and will continue to monitor the temperature data of the battery pack during the charging process. For example, if the temperature data during normal charging is 26°C-50°C, the control device will ensure that the battery pack is charged within this safe temperature range. Once the temperature of the battery pack approaches or exceeds the upper limit temperature (50°C), the control device will quickly adjust the charging strategy, which may include reducing the charging current, suspending charging, or starting the cooling system to avoid damage caused by overheating of the battery.

[0034] This embodiment obtains the current operating status of the battery pack and the current temperature data of the battery pack, determines the difference between the current temperature data and the preset temperature threshold value corresponding to the operating status, controls the temperature control circuit to adjust the operating temperature of the battery pack according to the preset strategy, heats the battery pack when the temperature signal is lower than the preset temperature threshold value, and dissipates the heat of the battery pack when the temperature signal is higher than the preset temperature threshold value. This can better control the temperature of the battery pack during operation, thereby extending the battery life and improving the operating efficiency of the forklift.

[0035] It can be understood that the temperature detection circuit includes a plurality of temperature sensors; the plurality of temperature sensors are arranged on the outside of the battery pack and on each battery cell of the battery pack; and the temperature adjustment circuit is arranged corresponding to the position of the temperature sensors.

[0036] Optionally, refer to Figure 2 Another embodiment of the present invention provides a control method for a battery assembly, based on the above Figure 1 In the embodiment shown, obtaining the current temperature data of the battery pack is specifically step S110, wherein: S110 , obtaining first temperature data of the outer side of the battery pack and second temperature data of each battery cell.

[0037] In this embodiment, the first temperature data may include a temperature reading of the battery pack housing, which reflects the ambient temperature of the battery pack as a whole or external temperature changes caused by internal heating of the battery. In order to capture this data more accurately, multiple temperature sensors may be installed at different locations of the battery pack housing, and then the average or maximum value of these readings is taken as the first temperature data to ensure the representativeness and accuracy of the data.

[0038] The second temperature data, that is, the temperature data of each battery cell, is more critical because it is directly related to the health and working efficiency of the battery cell. An abnormal increase in the temperature of the battery cell may be a signal of overheating, overcharging or over-discharging, and immediate measures need to be taken to prevent potential safety risks. If the temperature of the battery cell is too low, it is easy to cause damage during the charging process. Therefore, installing an independent temperature sensor on each battery cell and recording its temperature changes in real time is crucial for the effective operation of the battery management system to ensure that the battery pack can operate well under various working conditions.

[0039] Optionally, determining the difference between the current temperature data and a preset temperature threshold value corresponding to the operating state, and controlling the temperature regulating circuit to adjust the operating temperature of the battery pack according to a preset strategy, includes step S2010, wherein: S2010. Determine the difference between the first temperature data, the second temperature data and a preset temperature threshold value according to the current operating state of the battery pack, and control the corresponding temperature adjustment circuit to operate according to a preset strategy to adjust the operating temperature of the battery pack.

[0040] In this embodiment, if the temperature data exceeds the preset high temperature threshold, the temperature control circuit will start the cooling mechanism, such as starting the fan or starting the liquid cooling circulation system, to discharge the excess heat from the battery pack to prevent the battery cell from overheating. This can not only avoid the degradation of battery cell performance, but also effectively prevent safety accidents caused by high temperature, such as thermal runaway or fire.

[0041] On the contrary, if the temperature data is lower than the preset low temperature threshold, the temperature control circuit will start the heating function, such as through electric heating elements or heat pump systems, to provide the necessary heat for the battery pack to ensure that the battery cells operate within a suitable temperature range. This is especially important for battery packs operating in cold environments, because too low a temperature will seriously affect the charging efficiency and discharge performance of the battery cells, and may even cause irreversible damage.

[0042] In addition, if abnormal temperature fluctuations are detected or they continue to deviate from the ideal range, the control device will immediately sound an alarm and may trigger emergency protection mechanisms, such as automatically cutting off the power supply or reducing the charging and discharging power to prevent the situation from deteriorating, ensuring that the battery pack can maintain optimal operating conditions under various operating conditions, thereby extending the battery life and improving the safety and reliability of the vehicle.

[0043] It can be understood that the temperature control circuit includes a plurality of power fans; the plurality of power fans are distributed at a plurality of positions of the battery pack.

[0044] Optionally, refer to Figure 3 Another embodiment of the present invention provides a control method for a battery assembly, based on the above Figure 1In the embodiment shown, determining the difference between the current temperature data and the preset temperature threshold value corresponding to the operating state, and controlling the temperature regulating circuit to adjust the operating temperature of the battery pack according to the preset strategy, includes S2020-S2050, wherein: S2020, obtaining the corresponding heat dissipation of the power fan at different powers to generate a power heat mapping table; S2030, determining a corresponding over-temperature position and an exceeded temperature value according to a difference between the first temperature data, the second temperature data and a preset temperature threshold; S2040, determining the excess heat corresponding to the exceeded temperature value; S2050. According to the over-temperature position and the excess heat, control the power fan at the corresponding position to rotate according to the power corresponding to the power-heat mapping table to dissipate the heat at the over-temperature position.

[0045] In this embodiment, the power heat map may include the corresponding heat dissipation and efficiency evaluation of the power fan at different powers to more accurately guide the fan control strategy. The power heat map not only records the heat that the fan can dissipate at each power level, but also takes into account the efficiency changes of the fan under different working conditions, such as the influence of factors such as air flow speed and ambient temperature on the heat dissipation effect.

[0046] Among them, power fans are fans with power above 40W, which are widely used in servers, industrial equipment, communication base stations and other occasions that require efficient heat dissipation. They are also suitable for efficient heat dissipation scenarios such as forklifts. These occasions usually have high requirements for fan speed, air volume, noise and other performance parameters, and power fans have become the preferred heat dissipation solution in these fields due to their powerful power output and stable performance.

[0047] In addition, the excess heat corresponding to the exceeded temperature value is accurately estimated to ensure the accuracy of regulation. By comprehensively considering the thermal conductivity, heat capacity of the battery pack material and external environmental factors such as ambient temperature, humidity and air flow rate, the specific heat value required to dissipate exceeding the preset temperature threshold is calculated.

[0048] In actual operation, the control device will first detect and record two key temperature data of the battery pack in real time: one is the center temperature inside the battery pack (first temperature data), which represents the overall thermal state of the battery pack; the other is the temperature of the heat dissipation surface outside the battery pack (second temperature data), which reflects the efficiency of the heat dissipation system. By comparing these two temperature data with the preset temperature threshold, the control device can quickly locate the over-temperature position and calculate the additional heat represented by the exceeded temperature value.

[0049] Next, based on the over-temperature location and the excess heat, the control device will look up the corresponding fan power setting from the power-heat mapping table. This mapping table not only includes the fan's heat dissipation capacity at different powers, but also incorporates the fan efficiency evaluation factor to ensure that the heat dissipation effect can be maximized while reducing unnecessary energy consumption during the regulation process. By adjusting the speed of the power fan at the corresponding position, the control device can accurately control the fan's heat dissipation capacity to quickly dissipate the heat at the over-temperature location and return the battery pack temperature to a safe range.

[0050] It is worth noting that during the entire control process, the control device will continue to monitor the temperature changes of the battery pack and fine-tune the control strategy according to the actual situation. This dynamic adjustment mechanism can ensure that the control device can always maintain efficient heat dissipation performance in a complex and changing operating environment, providing a stable and reliable working environment for the battery pack.

[0051] By monitoring the temperature of key areas of the battery pack in real time, not only can the over-temperature location be accurately identified, but the specific over-temperature value and its corresponding additional heat demand can also be calculated. The accuracy of this step is crucial for taking appropriate heat dissipation measures later.

[0052] Next, the control device will intelligently select and adjust the operating status of the power fan at the corresponding position according to the over-temperature location and the excess heat level. The power heat mapping table serves as the basis for decision-making, ensuring that the power output of each fan can accurately match the required heat dissipation, avoiding energy waste or insufficient heat dissipation.

[0053] It is worth noting that in addition to directly controlling the fan power, the control device can also combine other heat dissipation mechanisms, such as liquid cooling loops or heat pipe technology, to form a multi-level heat dissipation system. Such a design not only improves the heat dissipation efficiency, but also enhances the reliability and stability of the entire battery management system.

[0054] In addition, the control device will continuously monitor the effect of temperature regulation and make dynamic adjustments based on real-time feedback. Once the temperature data returns to the preset safe range, it will reduce or stop additional cooling measures accordingly to save energy and extend the service life of the equipment. It can effectively ensure that the battery pack can be maintained in a safe and stable temperature range under various operating conditions, thereby ensuring the normal operation and long-term reliability of the entire system.

[0055] It can be understood that the temperature control circuit includes a plurality of battery heating components; each battery cell is provided with at least one battery heating component.

[0056] Optionally, refer to Figure 4 Another embodiment of the present invention provides a control method for a battery assembly, based on the above Figure 1In the embodiment shown, determining the difference between the current temperature data and the preset temperature threshold value corresponding to the operating state, and controlling the temperature regulating circuit to adjust the operating temperature of the battery pack according to the preset strategy includes: S2060, determining a battery cell temperature difference corresponding to each battery cell according to the second temperature data and a preset temperature threshold; S2070: Control the battery heating components at the corresponding positions of the battery cells to heat the battery cells according to the corresponding battery cell temperature differences until the temperature of the battery cells reaches a preset temperature threshold.

[0057] In this embodiment, at least one battery heating component is provided in each battery cell, so as to realize independent heating control of each battery cell. This design not only improves the accuracy of temperature regulation, but also effectively avoids the potential safety hazards caused by uneven temperature inside the battery pack. Each battery heating component can be accurately adjusted according to the difference between the real-time temperature of the battery cell and the preset temperature threshold, ensuring that the battery cell operates within the optimal temperature range, extending the service life of the battery, and improving the performance stability of the entire battery system.

[0058] It can be understood that the battery assembly includes a charging contactor, an input end of the charging contactor is used to access an external power source, and an output end of the charging contactor is used to be electrically connected to the battery pack.

[0059] Optionally, refer to Figure 5 Another embodiment of the present invention provides a control method for a battery assembly, based on the above Figure 1 In the embodiment shown, determining the difference between the current temperature data and the preset temperature threshold value corresponding to the operating state, and controlling the temperature regulating circuit to adjust the operating temperature of the battery pack according to the preset strategy includes: S2080, obtaining current first power data of the battery pack; S2090, when the first power data is lower than a preset power threshold, obtaining current third temperature data of the battery pack; S2100, after adjusting the current temperature data to a preset temperature threshold, controlling the charging contactor to be turned on according to a preset charging power to charge the battery pack; S2110, continuously acquiring second power data at a preset interval, and acquiring fourth temperature data of the battery pack, and determining a charging temperature difference between the fourth temperature data and a temperature threshold corresponding to the second power data; S2120, controlling the temperature regulating circuit to regulate the temperature of the battery pack according to the charging temperature difference.

[0060] In this embodiment, based on the above-mentioned charging process control logic, an intelligent battery assembly maintenance strategy is provided, which not only focuses on temperature regulation during charging, but also covers daily maintenance and abnormality detection of battery assemblies to ensure long-term stable operation and high efficiency performance of the battery assemblies.

[0061] First, the control unit will perform a comprehensive battery health check regularly (such as daily, weekly, or customized according to battery usage). This process includes but is not limited to detecting the voltage balance of the battery pack, changes in internal resistance, and whether there are any potential short circuit or open circuit risks. Through built-in high-precision sensors and data analysis algorithms, the control unit can accurately assess the health status of the battery and give corresponding maintenance recommendations or warnings.

[0062] Secondly, during the charging process, in addition to dynamically adjusting the charging strategy according to the power and temperature, the control device also monitors the status of the charging contactor in real time. Once the contactor is found to have poor contact, overheating or other abnormal conditions, the control device will immediately interrupt the charging process and issue an alarm to notify the user or maintenance personnel to check and handle it. This real-time fault detection and response mechanism effectively avoids battery damage or safety accidents caused by charging equipment failure.

[0063] In addition, in order to improve the service life and performance of the battery assembly, the present invention also introduces an intelligent charge and discharge management function. According to the real-time power of the battery pack, the usage history and the charging habits of the user, the control device can automatically calculate the optimal charge and discharge plan and automatically execute it at the right time. For example, charging is performed during the night time when the grid load is low, or automatically switching to low power consumption mode when the battery is about to run out to extend the use time. This intelligent charge and discharge management not only helps to save energy costs, but also effectively prolongs the service life of the battery.

[0064] Optionally, refer to Figure 6 Another embodiment of the present invention provides a control method for a battery assembly, based on the above Figure 1 In the embodiment shown, controlling the charging contactor to conduct according to the preset charging power to charge the battery pack is specifically steps S2101-S2103, wherein: S2101, obtaining the upper limit voltage of each battery cell, the maximum input current of each battery cell, the voltage data of the external power supply, and the current data of the external power supply; S2102, calculating the optimal charging power output by the charging contactor according to the upper limit voltage, the maximum input current, the voltage data of the external power supply, and the current data of the external power supply; S2103. According to the optimal charging power, control the charging contactor to be turned on to charge the battery pack.

[0065] In this embodiment, the charging status of the battery pack is monitored in real time, including key parameters such as voltage, current and temperature, to ensure the safety and efficiency of the charging process.

[0066] First, high-precision sensors are used to collect the real-time voltage and temperature of each battery cell in the battery pack, as well as the current value flowing through the battery pack. These data are important bases for evaluating the health status and charging efficiency of the battery pack. Based on the collected data, combined with the preset safety threshold and charging strategy, intelligent analysis is performed. If it is detected that the voltage or temperature of any battery cell exceeds the safety range, or the charging current fluctuates abnormally, the control device will immediately activate the protection mechanism, such as reducing the charging power, suspending charging, or issuing an alarm to prevent damage to the battery pack or even a safety accident.

[0067] In addition, the control device will dynamically adjust the charging strategy according to the real-time status of the battery pack. For example, when the battery pack is close to full charge, the charging power is automatically reduced and the trickle charging mode is adopted to reduce the impact on the battery life. In addition, if the external power supply conditions change (such as voltage fluctuations, insufficient current, etc.), the system can also respond quickly and adjust the output power of the charging contactor to ensure a smooth charging process.

[0068] During the entire charging process, the control device will also record and analyze charging data, including key indicators such as charging time, charging capacity, and charging efficiency. These data can not only be used to evaluate the effect of this charging, but also provide data support for subsequent charging strategy optimization, which can not only ensure the safety and efficiency of the charging process, but also effectively extend the service life of the battery pack and improve the user experience.

[0069] It can be understood that the battery assembly includes a discharge contactor, the input end of the discharge contactor is connected to the battery pack, and the output end of the discharge contactor is used to connect to the load.

[0070] Optionally, refer to Figure 7 Another embodiment of the present invention provides a control method for a battery assembly, based on the above Figure 1 In the embodiment shown, determining the difference between the current temperature data and the preset temperature threshold value corresponding to the operating state, and controlling the temperature regulating circuit to adjust the operating temperature of the battery pack according to the preset strategy includes: S2130, when the operating state is discharging, obtaining a current first discharge temperature of the battery pack; S2140, adjusting the first discharge temperature to within a first preset discharge temperature threshold, and controlling the discharge contactor to be turned on to supply power in the battery pack to the load; S2150, continuously obtaining a second discharge temperature during the discharge process of the battery pack; S2160. When the second discharge temperature exceeds the first preset discharge temperature threshold, the temperature control circuit is controlled to dissipate heat from the battery pack, and when the discharge temperature of the battery pack exceeds the second preset discharge temperature threshold, the discharge contactor is controlled to be turned off, and the battery pack stops supplying power to the load; wherein the second preset discharge temperature threshold is greater than the first preset discharge temperature threshold.

[0071] In this embodiment, the discharge contactor and the temperature control circuit work together to achieve refined temperature management of the battery pack during the discharge process. When the battery pack starts to discharge, the control device first ensures that the battery pack is within a suitable first preset discharge temperature threshold range, which helps to maximize the discharge efficiency and safety of the battery pack. At this time, the discharge contactor is activated, and the battery pack can smoothly provide power to the load.

[0072] However, as the discharge process continues, heat may be generated inside the battery pack due to chemical reactions or current flow, causing the temperature to rise. In order to prevent the risk of overheating, the control device monitors the second discharge temperature of the battery pack in real time and sets a more stringent second preset discharge temperature threshold as a safety limit. Once the temperature reaches this threshold, the temperature control circuit starts immediately and actively cools the battery pack through fan heat dissipation, liquid cooling cycle or other effective means to ensure that it operates within a safe range.

[0073] If the discharge temperature of the battery pack continues to rise to a dangerous level exceeding the second preset discharge temperature threshold despite the cooling measures, the control device will decisively take protective measures to automatically cut off the discharge contactor and disconnect the battery pack from the load, thereby avoiding potential serious consequences such as fire and explosion. This emergency power-off mechanism is the last line of defense to ensure the safety of the battery pack and the entire battery assembly.

[0074] In addition, this embodiment also takes into account the different requirements of the battery pack for temperature management under different operating conditions. For example, during the charging process, different temperature thresholds and control strategies may need to be set to ensure the optimization of charging efficiency and battery life. Therefore, the system should have flexible configuration capabilities to adapt to different application scenarios and user needs.

[0075] Optionally, refer to Figure 8 Another embodiment of the present invention provides a control method for a battery assembly, based on the above Figure 1 In the embodiment shown, the control method further includes S300-S400, wherein: S300, obtaining the operation instruction of the user on the operation panel; S400: Display the operating temperature and operating status of the battery pack according to the operating instruction, or adjust the value of the preset temperature threshold or control the operation of the temperature adjustment circuit.

[0076] In this embodiment, the operation panel, as an intuitive interface for users to interact with the device, not only carries the function of receiving user instructions, but also improves the user experience through real-time feedback. When the user touches the screen or presses a button, the control device immediately captures the operation instruction and quickly interprets its intention. Subsequently, on the high-definition display, the current operating temperature of the battery pack is displayed in the form of intuitive numbers or charts, allowing users to see it at a glance. At the same time, the operating status of the battery, such as charging, discharging, standby, etc., will also be presented together with the temperature information, providing users with comprehensive equipment monitoring.

[0077] In addition, if the user needs to adjust the preset temperature threshold to adapt to a specific working environment or protect the battery from overheating damage, the operation panel also provides a convenient way to adjust it. The user only needs to simply set it, and the control device will automatically record and apply the new temperature threshold to ensure that the battery operates within a safe temperature range. In addition, for devices with intelligent temperature control function, users can also directly control the action of the temperature control circuit through the operation panel to achieve precise adjustment of the battery temperature, whether it is rapid cooling to deal with emergencies, or slow heating to maintain optimal working performance.

[0078] The present invention also proposes a control device, which includes: the control device includes: a memory, a processor, and a control program of a battery assembly stored in the memory and executable on the processor, the control program of the battery assembly being configured to implement the above control method of the battery assembly.

[0079] It is worth noting that since the control device of the present invention is based on the control method of the above-mentioned battery assembly, the embodiments of the control device of the present invention include all technical solutions of all embodiments of the control method of the above-mentioned battery assembly, and the technical effects achieved are also exactly the same, which will not be repeated here.

[0080] The present invention also provides a forklift, which comprises the control device according to the above embodiment.

[0081] It is worth noting that since the forklift of the present invention is based on the above-mentioned control device, the embodiments of the forklift of the present invention include all technical solutions of all embodiments of the above-mentioned control device, and the technical effects achieved are also exactly the same, which will not be repeated here.

[0082] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.

[0083] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0084] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as above, and includes a number of instructions for a terminal device (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods of various embodiments of the present invention.

[0085] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A control method for a battery assembly, wherein the battery assembly is applied to a forklift, the battery assembly comprises a battery pack, a temperature detection circuit for detecting current temperature data of the battery pack, and a temperature adjustment circuit for adjusting the temperature of the battery pack, characterized in that: The control method comprises: Acquire the current operating state of the battery pack and the current temperature data of the battery pack, wherein the operating state includes charging, discharging or standing still; Determine the difference between the current temperature data and the preset temperature threshold value corresponding to the operating state, and control the temperature adjustment circuit to adjust the operating temperature of the battery pack according to a preset strategy; When the temperature signal is lower than a preset temperature threshold, the battery pack is heated, and when the temperature signal is higher than the preset temperature threshold, the battery pack is cooled.

2. The control method of the battery assembly according to claim 1, characterized in that: The temperature detection circuit includes a plurality of temperature sensors; the plurality of temperature sensors are arranged on the outside of the battery pack and on each battery cell of the battery pack; the temperature adjustment circuit is arranged corresponding to the position of the temperature sensor; The specific steps of obtaining the current temperature data of the battery pack are as follows: Acquire first temperature data of the outer side of the battery pack and second temperature data of each of the battery cells; The determining a difference between the current temperature data and a preset temperature threshold value corresponding to the operating state, and controlling the temperature regulating circuit to adjust the operating temperature of the battery pack according to a preset strategy, includes: According to the current operating state of the battery pack, the difference between the first temperature data, the second temperature data and a preset temperature threshold is determined respectively, and the corresponding temperature adjustment circuit action is controlled according to a preset strategy to adjust the operating temperature of the battery pack.

3. The control method of the battery assembly according to claim 2, characterized in that: The temperature control circuit includes a plurality of power fans; the plurality of power fans are distributed at a plurality of positions of the battery pack; The determining a difference between the current temperature data and a preset temperature threshold value corresponding to the operating state, and controlling the temperature regulating circuit to adjust the operating temperature of the battery pack according to a preset strategy, includes: Obtaining the corresponding heat dissipation of the power fan at different powers to generate a power-heat mapping table; Determine the corresponding over-temperature position and the exceeded temperature value according to the difference between the first temperature data, the second temperature data and a preset temperature threshold; Determining the excess heat corresponding to the excess temperature value; According to the over-temperature position and the excess heat, the power fan at the corresponding position is controlled to rotate according to the power corresponding to the power-heat mapping table to dissipate the heat at the over-temperature position.

4. The control method of the battery assembly according to claim 2, characterized in that: The temperature control circuit includes a plurality of battery heating components; each of the battery cells is provided with at least one battery heating component; The determining a difference between the current temperature data and a preset temperature threshold value corresponding to the operating state, and controlling the temperature regulating circuit to adjust the operating temperature of the battery pack according to a preset strategy, includes: Determine a battery cell temperature difference corresponding to each battery cell according to the second temperature data and the preset temperature threshold; The battery heating components at the corresponding positions of the battery cells are controlled to heat the battery cells according to the corresponding battery cell temperature differences until the temperature of the battery cells reaches a preset temperature threshold.

5. The control method of the battery assembly according to any one of claims 1 to 4, characterized in that: The battery assembly includes a charging contactor, the input end of the charging contactor is used to connect to an external power source, and the output end of the charging contactor is used to be electrically connected to the battery pack; The determining a difference between the current temperature data and a preset temperature threshold value corresponding to the operating state, and controlling the temperature regulating circuit to adjust the operating temperature of the battery pack according to a preset strategy, includes: Obtaining the current first power data of the battery pack; When the first power data is lower than a preset power threshold, obtaining current third temperature data of the battery pack; After adjusting the current temperature data to a preset temperature threshold, the charging contactor is controlled to be turned on according to a preset charging power to charge the battery pack; Continuously acquiring second power data at a preset interval, and acquiring fourth temperature data of the battery pack, and determining a charging temperature difference between the fourth temperature data and a temperature threshold corresponding to the second power data; The temperature regulating circuit is controlled to regulate the temperature of the battery pack according to the charging temperature difference.

6. The control method of the battery assembly according to claim 5, characterized in that: The controlling the charging contactor to conduct according to the preset charging power to charge the battery pack is specifically as follows: Obtain the upper limit voltage of each battery cell, the maximum input current of each battery cell, the voltage data of the external power supply, and the current data of the external power supply; Calculating the optimal charging power output by the charging contactor according to the upper limit voltage, the maximum input current, the voltage data of the external power supply, and the current data of the external power supply; According to the optimal charging power, the charging contactor is controlled to be turned on to charge the battery pack.

7. The control method of a battery assembly according to any one of claims 1 to 4, characterized in that: The battery assembly includes a discharge contactor, the input end of the discharge contactor is connected to the battery pack, and the output end of the discharge contactor is used to connect to a load; The determining a difference between the current temperature data and a preset temperature threshold value corresponding to the operating state, and controlling the temperature regulating circuit to adjust the operating temperature of the battery pack according to a preset strategy, includes: When the operating state is discharging, obtaining a current first discharge temperature of the battery pack; adjusting the first discharge temperature to within the first preset discharge temperature threshold, and controlling the discharge contactor to be turned on, so as to supply power in the battery pack to the load; Continuously obtaining a second discharge temperature during the discharge process of the battery pack; When the second discharge temperature exceeds the first preset discharge temperature threshold, the temperature regulating circuit is controlled to dissipate heat from the battery pack, and when the discharge temperature of the battery pack exceeds the second preset discharge temperature threshold, the discharge contactor is controlled to be turned off, and the battery pack stops supplying power to the load; Wherein, the second preset discharge temperature threshold is greater than the first preset discharge temperature threshold.

8. The control method of the battery assembly according to claim 1, characterized in that: The control method further comprises: Get the user's operation instructions on the operation panel; According to the operation instruction, the operating temperature and operating status of the battery pack are displayed, or the value of the preset temperature threshold is adjusted or the action of the temperature adjustment circuit is controlled.

9. A control device, characterized in that: The control device includes: a memory, a processor, and a control program of the battery assembly stored in the memory and executable on the processor, wherein the control program of the battery assembly is configured to implement the control method of the battery assembly as described in any one of claims 1 to 8.

10. A forklift, characterized in that: Comprising a control device as claimed in claim 9.

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