Battery temperature control circuit, forklift battery assembly and forklift

Abstract

The invention provides a battery temperature control circuit, a forklift battery assembly and a forklift, and relates to the technical field of forklifts. The temperature detection circuit comprises a temperature sensor, the temperature sensor is attached to the battery pack or a battery cell of the battery pack, and the temperature detection circuit is used for monitoring the current operation temperature of the battery pack and outputting a corresponding temperature signal; the first input end of the control circuit is connected with the output end of the temperature detection circuit; the input end of the temperature adjusting circuit is connected with the output end of the control circuit; the temperature adjusting circuit is used for adjusting the temperature of the battery pack; the control circuit is used for controlling the temperature adjusting circuit to adjust the running temperature of the battery pack according to the temperature signal and a preset strategy, and the preset strategy comprises heating the battery pack when the temperature signal is lower than a preset temperature threshold value and cooling the battery pack when the temperature signal is higher than the preset temperature threshold value. The battery temperature can be controlled, 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 forklifts, and in particular to a battery temperature control circuit, a forklift battery assembly and a forklift. Background Art

[0002] During forklift operation, the battery is used as a power source, and its performance directly affects the operating efficiency and safety of the forklift. However, the battery generates heat during the charging and discharging process. If it is not controlled, the battery temperature will be too high, which will lead to a decrease in battery performance and even cause safety accidents. In a low temperature environment, the battery's chemical reaction rate will slow down, resulting in a decrease in its output power, affecting the normal operation of the forklift.

[0003] The current method of controlling excessive temperature of forklift batteries mainly relies on natural heat dissipation or simple fan heat dissipation, and when the temperature is too low, it is directly heated. It cannot effectively cope with temperature changes 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 battery temperature control circuit, which is intended 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 battery temperature control circuit, the battery temperature control circuit comprising: Battery pack; A temperature detection circuit, wherein the temperature detection circuit comprises a temperature sensor, wherein the temperature sensor is attached to the battery pack or disposed on a cell of the battery pack, and the temperature detection circuit is used to monitor the current operating temperature of the battery pack and output a corresponding temperature signal; A control circuit, wherein a first input terminal of the control circuit is connected to an output terminal of the temperature detection circuit; a temperature regulating circuit, wherein an input end of the temperature regulating circuit is connected to an output end of the control circuit, and the temperature regulating circuit is used to regulate the temperature of the battery pack; The control circuit is used to control the temperature control circuit to adjust the operating temperature of the battery pack according to the temperature signal and a preset strategy. The preset strategy includes heating the battery pack when the temperature signal is lower than a preset temperature threshold, and dissipating heat from the battery pack when the temperature signal is higher than the preset temperature threshold.

[0006] Optionally, the temperature control circuit includes a plurality of power fans; When the temperature signal is higher than a preset temperature threshold, at least one of the power fans is controlled to operate at a preset speed to dissipate heat for the battery pack.

[0007] Optionally, a plurality of the power fans are distributed at a plurality of positions of the battery pack; There are multiple temperature sensors, and the temperature sensors are distributed at multiple positions of the battery pack; The temperature detection circuit is used to output a corresponding temperature signal according to the operating temperature transmitted back by the plurality of temperature sensors; The control circuit is used to control the power fan at the corresponding position of the battery pack to rotate at a preset speed according to the temperature signal, so as to dissipate heat when the temperature of the battery pack exceeds a preset temperature threshold.

[0008] Optionally, the battery pack has a plurality of battery cells; the temperature regulating circuit includes a plurality of battery heating components; Each of the battery cells is provided with at least one battery heating assembly; The preset strategy includes controlling the corresponding battery heating component to heat the battery cell when the temperature signal is lower than a preset temperature threshold, until the temperature of the battery cell reaches a preset operating temperature threshold.

[0009] Optionally, it also includes: A charging circuit, wherein the input end of the charging circuit is used to connect to an external power source, the output end of the charging circuit is connected to the battery pack, and the controlled end of the charging circuit is connected to the control circuit; The charging circuit comprises: A charging contactor, wherein the input end of the charging contactor is used to connect to an external power source, the output end of the charging contactor is connected to the battery pack, and the controlled end of the charging contactor is electrically connected to the control circuit; A pre-charging contactor, the input end of the pre-charging contactor being connected to the output end of the charging contactor; A first resistor, wherein a first end of the first resistor is connected to an output end of the pre-charging contactor.

[0010] Optionally, a shunt is provided between the charging circuit and the battery pack; The output end of the shunt is connected to the second input end of the control circuit. The shunt is used to collect the current signal output by the charging circuit to the battery pack and output it to the control circuit to control the output of the charging circuit.

[0011] Optionally, it also includes: A discharge circuit, wherein the input end of the discharge circuit is connected to the battery pack, the output end of the discharge circuit is used to connect to a load, the output end of the discharge circuit is connected to the output end of the pre-charging contactor, and the controlled end of the discharge circuit is electrically connected to the control circuit.

[0012] Optionally, it also includes: A human-machine interaction circuit, the human-machine interaction circuit is electrically connected to the control circuit, the human-machine interaction circuit is used to display the operating temperature and operating status of the battery pack, and the human-machine interaction circuit is also used for the user to select the corresponding control instruction to adjust the value of the preset temperature threshold or control the action of the temperature control circuit.

[0013] In addition, to achieve the above-mentioned purpose, the present invention also provides a forklift battery assembly, comprising the battery temperature control circuit as described above.

[0014] In addition, to achieve the above-mentioned object, the present invention also provides a forklift, comprising the forklift battery assembly as described above.

[0015] The embodiment of the present invention is provided with a temperature detection circuit, and the temperature detection circuit includes a temperature sensor. The temperature sensor is attached to the surface of the battery pack or to the battery cell of the battery pack to monitor the current operating temperature of the battery pack and output a corresponding temperature signal. A temperature control circuit is then provided to adjust the temperature of the battery pack. Finally, a control circuit is provided to control the temperature control circuit to adjust the operating temperature of the battery pack according to a preset strategy based on the temperature signal. When the temperature signal is lower than the preset temperature threshold, the battery pack is heated. When the temperature signal is higher than the preset temperature threshold, the battery pack dissipates heat, 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 circuit block diagram of a battery temperature control circuit according to an embodiment of the present invention; Figure 2 for Figure 1 A circuit block diagram of a temperature detection circuit in FIG. Figure 3 is a circuit block diagram of a battery temperature control circuit according to another embodiment of the present invention; Figure 4 for Figure 3 A schematic diagram of the structure of the power fan; Figure 5 for Figure 4 Schematic diagram of the exploded structure of the power fan and battery pack; Figure 6 A circuit block diagram of a battery temperature control circuit according to another embodiment of the present invention; Figure 7 A circuit block diagram of a battery temperature control circuit according to another embodiment of the present invention; Figure 8 A circuit block diagram of a battery temperature control circuit according to another embodiment of the present invention; Fig. 9 A circuit block diagram of a battery temperature control circuit according to another embodiment of the present invention; Fig.10 The figure is a circuit diagram of the battery temperature control circuit of the present invention.

[0019] Description of Figure Numbers:

[0020] 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

[0021] 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.

[0022] 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.

[0023] The main solution of the embodiment of the present application is: by providing a temperature detection circuit, and the temperature detection circuit includes a temperature sensor, and the temperature sensor is attached to the surface of the battery pack or to the battery cell of the battery pack to monitor the current operating temperature of the battery pack and output a corresponding temperature signal, and then a temperature control circuit is provided to adjust the temperature of the battery pack, and finally a control circuit is provided to control the temperature control circuit to adjust the operating temperature of the battery pack according to the temperature signal and a preset strategy. 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 dissipates heat.

[0024] The existing forklift battery control method of over-temperature mainly relies on natural heat dissipation or simple fan heat dissipation, and when the temperature is too low, no heating treatment is performed. It is unable to effectively cope with temperature changes under complex working conditions, resulting in shortened battery life and reduced forklift operating efficiency.

[0025] The present application provides a solution to control battery temperature, extend battery life, and improve forklift operating efficiency.

[0026] Reference Figure 1 and Figure 2 In one embodiment of the present invention, the battery temperature control circuit includes a battery pack 10, a temperature detection circuit 20, a control circuit 30 and a temperature adjustment circuit 40, wherein: The temperature detection circuit 20 includes a temperature sensor 21, which is attached to the battery pack 10 or to the battery cell 11 of the battery pack 10. The temperature detection circuit 20 is used to monitor the current operating temperature of the battery pack 10 and output a corresponding temperature signal. The first input end of the control circuit 30 is connected to the output end of the temperature detection circuit 20. The input end of the temperature control circuit 40 is connected to the output end of the control circuit 30, and the temperature control circuit 40 is used to adjust the temperature of the battery pack 10. The control circuit 30 is used to control the temperature control circuit 40 to adjust the operating temperature of the battery pack 10 according to the temperature signal and a preset strategy. The preset strategy includes heating the battery pack 10 when the temperature signal is lower than a preset temperature threshold, and dissipating heat from the battery pack 10 when the temperature signal is higher than the preset temperature threshold.

[0027] In this embodiment, the temperature sensor 21 may be a negative temperature coefficient (NTC) thermistor, whose resistance decreases as the temperature increases. This sensor has high sensitivity and good linearity, and is suitable for accurately measuring the temperature of the battery pack 10.

[0028] The control circuit 30 can be implemented by a main controller, such as an MCU (Micro controller Unit), a DSP (Digital Signal Process), an FPGA (Field Programmable Gate Array), a SOC (System On Chip), etc. It has the ability to process temperature signals and execute preset strategies. An analog-to-digital converter (ADC) can be integrated inside the control circuit 30 to convert the analog signal output by the temperature sensor 21 into a digital signal in order to process the temperature signal. The control circuit 30 can also have a communication interface, such as I2C or SPI, to exchange data and set parameters with external devices.

[0029] The temperature control circuit 40 may include a heating element and a heat dissipation element. The heating element may be a resistance wire or a semiconductor heater, which is used to provide heat to the battery pack 10 when the temperature is too low. The heat dissipation element may be a heat sink, a fan or a heat pipe, which is used to dissipate the heat generated by the battery pack 10 when the temperature is too high. The temperature control circuit 40 may also include a power control module, such as a MOSFET or a relay, which is used to adjust the working state of the heating or heat dissipation element according to the instruction of the control circuit 30.

[0030] In this embodiment, a temperature detection circuit 20 is provided, and the temperature detection circuit 20 includes a temperature sensor 21. The temperature sensor 21 is attached to the surface of the battery pack 10 or to the battery cell 11 of the battery pack 10 to monitor the current operating temperature of the battery pack 10 and output a corresponding temperature signal. A temperature control circuit 40 is provided to adjust the temperature of the battery pack 10. Finally, a control circuit 30 is provided to control the temperature control circuit 40 to adjust the operating temperature of the battery pack 10 according to a preset strategy based on the temperature signal. When the temperature signal is lower than the preset temperature threshold, the battery pack 10 is heated. When the temperature signal is higher than the preset temperature threshold, the battery pack 10 dissipates heat, thereby extending the battery life and improving the operating efficiency of the forklift.

[0031] Optionally, refer to Figures 3 to 5 Another embodiment of the present invention provides a battery temperature control circuit, based on the above Figure 1 and Figure 2 In the illustrated embodiment, the temperature control circuit 40 includes a plurality of power fans 41, wherein: When the temperature signal is higher than a preset temperature threshold, the control circuit 30 controls at least one power fan 41 to operate at a preset speed to dissipate heat for the battery pack 10 .

[0032] In this embodiment, the speed of the power fan 41 can be precisely controlled by the control circuit 30, for example, by using PWM (pulse width modulation) technology. PWM technology controls the speed of the fan by adjusting the pulse width, thereby achieving precise regulation of the fan speed. When the temperature signal gradually decreases and approaches the preset temperature threshold, the control circuit 30 will correspondingly reduce the duty cycle of the PWM signal, so that the speed of the power fan 41 gradually slows down to reduce unnecessary energy consumption.

[0033] The control circuit 30 receives real-time data from the temperature sensor 21 and dynamically adjusts the speed of the fan according to the temperature change of the battery pack 10. When the temperature gradually increases, the control circuit 30 instructs the fan to run at a higher speed to ensure that the temperature of the battery pack 10 remains within a safe range. Conversely, when the temperature drops to a value close to the normal value, the control circuit 30 will reduce the speed of the fan to reduce energy consumption and noise.

[0034] In order to improve the reliability of the system, the temperature control circuit 40 also has a fault detection function. Once a power fan 41 fails, the control circuit 30 will immediately detect and issue an alarm, and start the backup fan to ensure the normal operation of the cooling system. The number and position of the backup fans are carefully designed to ensure that sufficient cooling capacity can still be provided in the event of a main fan failure.

[0035] Optionally, the power of the power fan 41 is greater than or equal to 40 watts.

[0036] In this embodiment, since the battery temperature control circuit is applied to the forklift battery pack 10, the power design of the power fan 41 must take into account the actual requirements of the forklift's working environment. In order to better perform heat dissipation and temperature reduction, through testing the actual operating environment of multiple forklift battery packs 10, it is found that the power of the power fan 41 needs to be at least 40 watts. Such a design ensures that even under high temperature and high load working conditions, the fan can still provide sufficient air volume to maintain the normal working temperature of the battery pack 10.

[0037] Optionally, there are at least four power fans 41 .

[0038] In this embodiment, in order to ensure the heat dissipation effect of the battery pack 10 under various working conditions, the temperature control circuit 40 is designed with at least four power fans 41. The layout of the multiple fans is optimized to ensure that the airflow evenly covers various parts of the battery pack 10. Each fan is independently controlled, so that even if one of the fans fails, the other fans can still continue to work, thereby improving the redundancy and reliability of the battery temperature control circuit.

[0039] In addition, each power fan 41 is equipped with an independent air duct design to reduce interference between wind flows and ensure that each fan can play a maximum heat dissipation role. The air duct design also takes into account the special structure of the forklift battery pack 10 to avoid direct impact of wind force on the battery pack 10, thereby protecting the battery pack 10 from potential physical damage.

[0040] Optionally, refer to Figure 4 and Figure 5 Another embodiment of the present invention provides a battery temperature control circuit based on the above Figures 3 to 5 In the embodiment shown, a plurality of power fans 41 are distributed at a plurality of positions of the battery pack 10; a plurality of temperature sensors 21 are provided, and the temperature sensors 21 are distributed at a plurality of positions of the battery pack 10, wherein: The temperature detection circuit 20 is used to output a corresponding temperature signal according to the operating temperature transmitted back by multiple temperature sensors 21; the control circuit 30 is used to control the power fan 41 at the corresponding position of the battery pack 10 to rotate at a preset speed according to the temperature signal, so as to dissipate heat when the temperature of the battery pack 10 exceeds the preset temperature threshold.

[0041] In this embodiment, by rationally arranging and precisely controlling the power fans 41, the heat accumulation generated by the battery pack 10 during operation can be effectively reduced. The speed of each power fan 41 can be independently adjusted according to the temperature detected by the temperature sensor 21 at its corresponding position, thereby achieving more refined temperature management. Among them, the temperature sensor 21 will obtain the temperature data at the corresponding point and transmit the temperature data back to the control circuit 30. After calculation, the control circuit 30 generates corresponding control instructions and sends them to each power fan 41. This distributed control strategy ensures that each fan can optimize the speed adjustment according to the real-time temperature conditions in its area.

[0042] Optionally, refer to Figure 6 Another embodiment of the present invention provides a battery temperature control circuit, based on the above Figure 1 In the embodiment shown, the battery pack 10 has a plurality of battery cells 11; the temperature control circuit 40 includes a plurality of battery heating components 42; each battery cell 11 is provided with at least one battery heating component 42, wherein: The preset strategy includes controlling the corresponding battery heating assembly 42 to heat the battery cell 11 when the temperature signal is lower than the preset temperature threshold, until the temperature of the battery cell 11 reaches the preset operating temperature threshold.

[0043] In this embodiment, a battery pack 10 is formed by connecting a plurality of battery cells 11 in series or in parallel, wherein the battery cells 11 may be lithium-ion batteries, nickel-metal hydride batteries or other types of rechargeable batteries. The series connection can increase the voltage of the battery pack 10, while the parallel connection can increase the capacity of the battery pack 10.

[0044] In order to ensure that charging the battery cell 11 will not cause battery performance degradation or damage when the temperature is too low, at least one battery heating component 42 is correspondingly provided on each battery cell 11. When the battery cell 11 is low in power and the temperature signal is lower than the preset temperature threshold, the control circuit 30 will control the corresponding battery heating component 42 to heat the battery cell 11, thereby ensuring that the battery cell 11 operates within a safe temperature range and extending the battery life.

[0045] Optionally, refer to Figure 7 Another embodiment of the present invention provides a battery temperature control circuit, based on the above Figures 1 to 6 In the embodiment shown, the battery temperature control circuit further includes a charging circuit 50, wherein: The input end of the charging circuit 50 is used to access an external power source, the output end of the charging circuit 50 is connected to the battery pack 10 , and the controlled end of the charging circuit 50 is connected to the control circuit 30 .

[0046] In this embodiment, a charging circuit 50 is further provided for connecting an external power source to the battery pack 10 to store energy in the battery pack 10 when the battery power is low.

[0047] In this embodiment, the design of the charging circuit 50 can adopt pulse width modulation (PWM) technology to ensure that the battery pack 10 obtains the best charging efficiency and safety during the charging process. PWM technology effectively controls the charging rate of the battery by adjusting the pulse width of the charging current to avoid overcharging and overheating.

[0048] In addition, the charging circuit 50 may also have multiple protection functions, including over-current protection, short-circuit protection, and over-temperature protection. These protection mechanisms can quickly cut off the charging circuit 50 in abnormal situations to ensure the safety of the battery pack 10.

[0049] In actual applications, the charging circuit 50 and the control circuit 30 work closely together. By real-time monitoring of the voltage, current, temperature and other parameters of the battery pack 10, the control circuit 30 can accurately control the charging process. When the battery pack 10 is low in power, the control circuit 30 will instruct the charging circuit 50 to start the charging mode, and the external power supply will start charging the battery pack 10. As the power of the battery pack 10 gradually recovers, the control circuit 30 will adjust the charging strategy according to the battery status to achieve the best charging effect.

[0050] Optionally, refer to Fig.10 Another embodiment of the present invention provides a battery temperature control circuit, based on the above Figure 7 In the embodiment shown, the charging circuit 50 includes a charging contactor RL3, a pre-charging contactor RL2, and a first resistor R1, wherein: The input end of the charging contactor RL3 is used to connect to an external power supply, the output end of the charging contactor RL3 is connected to the battery pack 10, and the controlled end of the charging contactor RL3 is electrically connected to the control circuit 30; the input end of the pre-charging contactor RL2 is connected to the output end of the charging contactor RL3; the first end of the first resistor R1 is connected to the output end of the pre-charging contactor RL2.

[0051] In this embodiment, the controlled end of the pre-charging contactor RL2 is also electrically connected to the control circuit 30 to ensure that its action is coordinated with the charging contactor RL3. The main function of the pre-charging contactor RL2 is to provide a smaller current at the initial stage of charging the battery pack 10 to avoid direct large current impact on the battery, thereby protecting the battery and extending its service life. The function of the first resistor R1 is to limit the current during the pre-charging stage to ensure that the battery pack 10 is gradually charged within a safe current range.

[0052] When the battery pack 10 enters a stable charging stage, the charging contactor RL3 operates, and the control circuit 30 issues a command to disconnect the pre-charging contactor RL2, thereby cutting off the connection between the first resistor R1 and the battery pack 10. At this time, the charging contactor RL3 continues to remain in a closed state, and the battery pack 10 directly obtains a large charging current from the external power supply until the battery is fully charged.

[0053] Optionally, refer to Fig.10 Another embodiment of the present invention provides a battery temperature control circuit based on the above Figure 7 In the embodiment shown, a shunt RS is provided between the charging circuit 50 and the battery pack 10, wherein: The output end of the shunt RS is connected to the second input end of the control circuit 30 . The shunt RS is used to collect the current signal output from the charging circuit 50 to the battery pack 10 , and output it to the control circuit 30 to control the output of the charging circuit 50 .

[0054] In this embodiment, the shunt RS can be a precision current sensor having the characteristics of high precision and low internal resistance. The material of the shunt RS is usually a highly conductive metal, such as copper or aluminum, to ensure accurate acquisition of the current signal. The structure of the shunt RS is designed to be thin-sheet-shaped so as to introduce a smaller resistance into the circuit, thereby reducing the impact on the performance of the charging circuit 50.

[0055] The output signal of the shunt RS is usually a voltage signal, because the current signal is easily interfered during the transmission process. By converting the current signal into a voltage signal, the signal can be transmitted to the control circuit 30 more stably. The output voltage signal of the shunt RS is proportional to the current flowing through it, so that the control circuit 30 can determine the size of the charging current according to the size of the voltage signal.

[0056] After receiving the output signal of the current divider RS, the control circuit 30 will perform a series of processing and analysis. The control circuit 30 can dynamically adjust the output of the charging circuit 50 according to the preset charging strategy and the current signal collected in real time. For example, when the battery pack 10 is close to a fully charged state, the control circuit 30 will reduce the charging current to avoid overcharging. On the contrary, when the battery pack 10 is low in power, the control circuit 30 will increase the charging current to shorten the charging time.

[0057] Optionally, refer to Figure 8 Another embodiment of the present invention provides a battery temperature control circuit, based on the above Figure 7 In the embodiment shown, the battery temperature control circuit further includes a discharge circuit 60, wherein: The input end of the discharge circuit 60 is connected to the battery pack 10 , the output end of the discharge circuit 60 is used to connect to the load, the output end of the discharge circuit 60 is connected to the output end of the pre-charge contactor RL2 , and the controlled end of the discharge circuit 60 is electrically connected to the control circuit 30 .

[0058] In this embodiment, the discharge circuit 60 can be a circuit composed of multiple power switch tubes. The H-bridge circuit can realize the power supply control of the load, thereby providing a more flexible control method during the discharge process. Each power switch tube can be a semiconductor switch device such as MOSFET or IGBT to ensure the reliable operation of the circuit under high current and high voltage conditions.

[0059] The control circuit 30 can control the power switch tube in the discharge circuit 60 through a PWM (pulse width modulation) signal, thereby achieving precise regulation of the discharge current. The frequency and duty cycle of the PWM signal can be adjusted according to the load characteristics to achieve the best discharge effect and efficiency.

[0060] In addition, the discharge circuit 60 may also include a current detection module for real-time monitoring of the current flowing through the load. The current detection module may use technologies such as a Hall effect sensor or a current transformer to ensure detection accuracy and response speed. The detected current signal will be fed back to the control circuit 30 for real-time current control and protection.

[0061] Optionally, refer to Fig. 9 Another embodiment of the present invention provides a battery temperature control circuit, based on the above Figure 1 and Figure 2 In the embodiment shown, the battery temperature control circuit further includes a human-computer interaction circuit 70, wherein: The human-machine interaction circuit 70 is electrically connected to the control circuit 30. The human-machine interaction circuit 70 is used to display the operating temperature and operating status of the battery pack 10. The human-machine interaction circuit 70 is also used for the user to select the corresponding control instruction to adjust the value of the preset temperature threshold or control the action of the temperature control circuit 40.

[0062] In this embodiment, the human-computer interaction circuit 70 may include a touch screen interface, which is concise and intuitive, and convenient for users to operate. The touch screen may display multiple function options, such as temperature monitoring, status indication, control command input, etc.

[0063] The human-computer interaction circuit 70 can facilitate the user to select the corresponding control instruction. When the user touches the corresponding instruction, the value of the preset temperature threshold can be adjusted, or the action of the temperature adjustment circuit 40 can be manually controlled, such as manually controlling heating or cooling. In addition, the human-computer interaction circuit 70 can also provide real-time feedback, displaying the temperature curve of the current battery pack 10, to help the user better understand the operating status of the battery.

[0064] In addition, the human-computer interaction circuit 70 can also be equipped with a voice recognition function, allowing the user to control the relevant operations of the battery pack 10 through voice commands. For example, the user can say "display temperature" or "adjust temperature threshold" and other commands, and the human-computer interaction circuit 70 will automatically perform the corresponding operation and feedback the current temperature value or adjustment result through voice.

[0065] The present invention also provides a forklift battery assembly, comprising the battery temperature control circuit according to all the above embodiments.

[0066] It is worth noting that since the forklift battery assembly of the present invention is based on the above-mentioned battery temperature control circuit, the embodiments of the forklift battery assembly of the present invention include all technical solutions of all embodiments of the above-mentioned battery temperature control circuit, and the technical effects achieved are also exactly the same, which will not be repeated here.

[0067] The present invention further provides a forklift, which includes the forklift battery assembly according to the above embodiment.

[0068] It is worth noting that since the forklift of the present invention is based on the forklift battery assembly mentioned above, the embodiments of the forklift of the present invention include all technical solutions of all embodiments of the forklift battery assembly mentioned above, and the technical effects achieved are also exactly the same, which will not be repeated here.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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 battery temperature control circuit, characterized in that: The battery temperature control circuit comprises: Battery pack; A temperature detection circuit, wherein the temperature detection circuit comprises a temperature sensor, wherein the temperature sensor is attached to the battery pack or disposed on a cell of the battery pack, and the temperature detection circuit is used to monitor the current operating temperature of the battery pack and output a corresponding temperature signal; A control circuit, wherein a first input terminal of the control circuit is connected to an output terminal of the temperature detection circuit; a temperature regulating circuit, wherein an input end of the temperature regulating circuit is connected to an output end of the control circuit, and the temperature regulating circuit is used to regulate the temperature of the battery pack; The control circuit is used to control the temperature control circuit to adjust the operating temperature of the battery pack according to the temperature signal and a preset strategy. The preset strategy includes heating the battery pack when the temperature signal is lower than a preset temperature threshold, and dissipating heat from the battery pack when the temperature signal is higher than the preset temperature threshold.

2. The battery temperature control circuit according to claim 1, characterized in that: The temperature control circuit includes a plurality of power fans; When the temperature signal is higher than a preset temperature threshold, at least one of the power fans is controlled to operate at a preset speed to dissipate heat for the battery pack.

3. The battery temperature control circuit according to claim 2, characterized in that: A plurality of the power fans are distributed at a plurality of positions of the battery pack; There are multiple temperature sensors, and the temperature sensors are distributed at multiple positions of the battery pack; The temperature detection circuit is used to output a corresponding temperature signal according to the operating temperature transmitted back by the plurality of temperature sensors; The control circuit is used to control the power fan at the corresponding position of the battery pack to rotate at a preset speed according to the temperature signal, so as to dissipate heat when the temperature of the battery pack exceeds a preset temperature threshold.

4. The battery temperature control circuit according to claim 1, characterized in that: The battery pack has a plurality of battery cells; the temperature regulating circuit includes a plurality of battery heating components; Each of the battery cells is provided with at least one battery heating assembly; The preset strategy includes controlling the corresponding battery heating component to heat the battery cell when the temperature signal is lower than a preset temperature threshold, until the temperature of the battery cell reaches a preset operating temperature threshold.

5. The battery temperature control circuit according to any one of claims 1 to 4, characterized in that: Also includes: A charging circuit, wherein the input end of the charging circuit is used to connect to an external power source, the output end of the charging circuit is connected to the battery pack, and the controlled end of the charging circuit is connected to the control circuit; The charging circuit comprises: A charging contactor, wherein the input end of the charging contactor is used to connect to an external power source, the output end of the charging contactor is connected to the battery pack, and the controlled end of the charging contactor is electrically connected to the control circuit; A pre-charging contactor, the input end of the pre-charging contactor being connected to the output end of the charging contactor; A first resistor, wherein a first end of the first resistor is connected to an output end of the pre-charging contactor.

6. The battery temperature control circuit according to claim 5, characterized in that: A shunt is provided between the charging circuit and the battery pack; The output end of the shunt is connected to the second input end of the control circuit. The shunt is used to collect the current signal output by the charging circuit to the battery pack and output it to the control circuit to control the output of the charging circuit.

7. The battery temperature control circuit according to claim 5, characterized in that: Also includes: A discharge circuit, wherein the input end of the discharge circuit is connected to the battery pack, the output end of the discharge circuit is used to connect to a load, the output end of the discharge circuit is connected to the output end of the pre-charging contactor, and the controlled end of the discharge circuit is electrically connected to the control circuit.

8. The battery temperature control circuit according to claim 1, characterized in that: Also includes: A human-machine interaction circuit, the human-machine interaction circuit is electrically connected to the control circuit, the human-machine interaction circuit is used to display the operating temperature and operating status of the battery pack, and the human-machine interaction circuit is also used for the user to select the corresponding control instruction to adjust the value of the preset temperature threshold or control the action of the temperature control circuit.

9. A forklift battery assembly, characterized in that: The battery temperature control circuit comprises the battery temperature control circuit as claimed in any one of claims 1 to 8.

10. A forklift, characterized in that: Comprising the forklift battery assembly as claimed in claim 9.

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