Method for testing combined working condition of battery of electric forklift

Abstract

The invention discloses an electric forklift battery joint condition test method, which belongs to the technical field of cable auxiliary installation equipment, and comprises the following steps: judging whether to execute a heating strategy or a refrigeration strategy according to the battery temperature and the heat-conducting medium temperature; if yes, whether refrigeration or heating is started or not is judged according to the operation information; if the heating strategy is executed, a heater is started; and if the refrigeration strategy is executed, a refrigerator is started. The battery has the effect of improving the performance and the safety of the battery.

Description

Technical Field

[0001] The present invention belongs to the field of power battery testing methods, and in particular relates to a combined operating condition testing method for an electric forklift battery. Background Art

[0002] In the field of electric forklifts, the performance and life of batteries are affected by multiple factors such as temperature, current, and voltage. Traditional electric forklift battery testing systems often lack comprehensive management and real-time monitoring of these factors, resulting in battery performance degradation at extreme temperatures and even possible safety accidents. In addition, a single test method cannot fully evaluate the performance of batteries under different working conditions, limiting the optimization and maintenance of battery performance. Therefore, a test system that can comprehensively consider multiple factors, monitor in real time, and intelligently adjust the battery status is needed to improve the efficiency and safety of electric forklift batteries. Summary of the invention

[0003] The purpose of the present invention is to overcome the above problems existing in the prior art and provide a method for testing the combined working conditions of an electric forklift battery.

[0004] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0005] A combined working condition test method for an electric forklift battery comprises the following steps:

[0006] Determine whether to execute a heating strategy or a cooling strategy based on the battery temperature and the temperature of the heat transfer medium;

[0007] If yes, determine whether to turn on cooling or heating based on the operation information;

[0008] If the heating strategy is executed, the heater is turned on; if the cooling strategy is executed, the refrigerator is turned on.

[0009] Optionally, determine whether the heating strategy activation condition is met; the heating strategy activation condition includes that the average temperature of the battery cell is less than or equal to temperature threshold one, and the minimum temperature of the battery cell is less than or equal to temperature threshold two.

[0010] Optionally, determine whether the discharge current and discharge voltage of the battery pack reach a threshold value; if so, execute the heating strategy; when the activation conditions of the heating strategy are not met, maintain the monitoring state.

[0011] Optionally, if the conditions for starting the heating strategy are met, the thermal cycle conditions are started and it is determined whether the heating conditions are met; when the temperature of the heat transfer medium is less than or equal to temperature threshold three, it is determined that the heating conditions are met; when the temperature of the heat transfer medium is greater than or equal to temperature threshold four, it is determined that the heating conditions are not met.

[0012] Optionally, the thermal cycle condition is that after the heating strategy is started, a start signal is sent to the water pump to allow the heat transfer medium to circulate in the flow channel.

[0013] Optionally, determine whether the conditions for starting the cooling strategy are met; the conditions for starting the cooling strategy include that the average temperature of the battery cell is greater than or equal to temperature threshold three, and the minimum temperature of the battery cell is greater than or equal to temperature threshold four.

[0014] Optionally, if the conditions for starting the refrigeration strategy are met, the cold cycle conditions are started and it is determined whether the cooling conditions are met; when the temperature of the heat transfer medium is less than or equal to temperature threshold three, it is determined that the cooling conditions are met; when the temperature of the heat transfer medium is less than or equal to temperature threshold four, it is determined that the cooling conditions are not met; when the conditions for starting the refrigeration strategy are not met, the monitoring state is maintained.

[0015] Optionally, the cold cycle condition is that after the refrigeration strategy is started, a start signal is sent to the water pump to allow the heat transfer medium to circulate in the flow channel.

[0016] Optionally, the remaining power of the battery pack is detected, and when the remaining power of the battery pack is greater than or equal to a power threshold, the heating strategy or the cooling strategy is executed; otherwise, the monitoring state is maintained.

[0017] Optionally, the external environment temperature is detected, and when the external environment temperature is greater than or equal to a temperature threshold of five, the heating strategy is not executed; when the external environment temperature is less than or equal to a temperature threshold of six, the cooling strategy is not executed.

[0018] The beneficial effects of the present invention are:

[0019] 1. The electric forklift battery joint operating condition test system provided in this application can effectively prevent the performance degradation and safety risks of the battery at extreme temperatures by real-time monitoring of key parameters such as battery voltage, current, temperature, etc., and intelligently adjust the temperature of the battery pack according to these parameters, thereby improving the performance and safety of the battery.

[0020] 2. The system of the present application can intelligently judge and execute heating or cooling strategies according to the actual working conditions and environmental conditions of the battery, optimize the thermal management of the battery, extend the service life of the battery, reduce energy consumption, and improve the overall energy efficiency of the electric forklift.

[0021] 3. This application supports the monitoring and management of the temperature and status of multiple battery packs. Whether the battery packs are configured in series or in parallel, they can be effectively controlled through a flexible heat exchanger and heat transfer medium circulation system, which enhances the adaptability and flexibility of the test system.

[0022] 4. Through precise temperature control and status assessment, the system can reduce unnecessary energy consumption while ensuring battery performance and safety, thereby improving the operating efficiency and operation time of the electric forklift. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0024] Figure 1 It is a flow chart of a combined operating condition testing method for an electric forklift battery according to an embodiment of the present invention.

[0025] Figure 2 It is a schematic diagram of the flow of the heating strategy according to an embodiment of the present invention. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In order to facilitate understanding of the above technical solutions of the present disclosure, the above technical solutions of the present disclosure are described in detail below through specific usage methods.

[0028] The first object of the present disclosure is to provide an electric forklift battery joint working condition test system, which includes a display module, a thermal management module, a signal acquisition module and a battery status evaluation module. The signal input end of the signal acquisition module is connected to the electric forklift lithium battery pack, and the output end is connected to the input end of the battery status evaluation module; the output end of the battery status evaluation module is connected to the input end of the display module and the thermal management module.

[0029] The signal acquisition module includes an operation information acquisition unit, a temperature signal acquisition unit, a current sensor and a voltage sensor; the voltage sensor and the current sensor detect the voltage and current of the electric forklift battery respectively.

[0030] One or more battery packs are usually installed in an electric forklift. The thermal management module includes a heat exchanger in contact with the battery pack, a flow channel connected to the heat exchanger, a water pump, a heater and a refrigerator arranged on the flow channel. The water inlet of the water pump is connected to the heat exchanger, the water outlet of the water pump is connected to the water inlet of the heater and the refrigerator respectively, and the water outlet of the heater and the refrigerator are connected to the heat exchanger respectively.

[0031] The heat-conducting medium flowing in the water pipe is a mixed solution of water and ethylene glycol. The heat-conducting medium circulates in the flow channel driven by the water pump. When the heat-conducting medium passes through the heater, the temperature is increased and it flows into the heat exchanger to heat the battery pack; after passing through the refrigerator, the temperature is reduced and it flows into the heat exchanger to cool the battery pack.

[0032] Specifically, when the electric forklift is equipped with multiple battery packs, multiple heat exchangers can be connected in series, and the heat-conducting medium flows through the heater or refrigerator and then flows through multiple battery pack water storage layers in turn before returning to the water pump; multiple heat exchangers can be connected in parallel, and the heat-conducting medium flows through the heater or refrigerator and then is diverted into different battery pack water storage layers, and then converges back to the water pump.

[0033] The temperature signal acquisition unit includes a temperature sensor 1 disposed in the heat exchanger and a temperature sensor 2 disposed in the battery pack. In this embodiment, the temperature sensor 1 and the temperature sensor 2 can be sensors that only measure the ambient temperature, or can be temperature and pressure sensors that measure both the ambient temperature and the ambient pressure. The temperature sensor 1 is used to measure the battery pack temperature, and the temperature sensor 2 is used to measure the temperature of the heat transfer medium in the heat exchanger.

[0034] The operation information collection unit includes a battery power collector and a temperature sensor 3. The battery power collector is used to detect the remaining power of the battery pack. The temperature sensor 3 is used to measure the external environment temperature.

[0035] The battery status assessment module performs corresponding heating or cooling logic judgments through the signals collected by temperature sensor 1 and temperature sensor 2, including the control of the heater and refrigerator power, thereby controlling the battery pack temperature and the temperature change rate.

[0036] The display module is used to display the operating strategy of the battery status assessment.

[0037] Based on the above test system, Figure 1 and Figure 2 As shown, the second object of the present disclosure is to provide an electric forklift battery joint working condition testing system, comprising the following steps:

[0038] S100. Determine whether to execute a heating strategy or a cooling strategy based on the battery temperature and the temperature of the heat transfer medium.

[0039] The battery temperature can be monitored and obtained through the temperature sensor 1 set in the battery pack; the multiple cells in the battery pack can be respectively provided with the temperature sensor 1 to measure the temperature of a single cell. The temperature of the heat transfer medium can be monitored and obtained through the temperature sensor 2 set in the heat exchanger to monitor the temperature of the heat transfer medium flowing into the heat exchanger in real time.

[0040] Optionally, S100 includes:

[0041] S110. Determine whether the heating strategy activation condition is met. The heating strategy activation condition includes that the average temperature of the battery cell is less than or equal to the temperature threshold 1, and the minimum temperature of the battery cell is less than or equal to the temperature threshold 2.

[0042] When the average temperature monitored by the temperature sensor 1 set in the battery cell is less than or equal to the temperature threshold 1, and the minimum temperature is less than or equal to the temperature threshold 2, it is judged that the heating strategy activation condition is met. At this time, the temperature inside the battery pack is too low, and the battery status evaluation module can ignore other collected signals and activate the heating strategy.

[0043] In one embodiment, S110 further includes: S111. Determine whether the discharge current and discharge voltage of the battery pack reach a threshold; if so, execute S110, otherwise maintain the monitoring state.

[0044] The current sensor detects that the battery pack discharge current reaches the current threshold, and the voltage sensor detects that the battery pack discharge voltage reaches the voltage threshold; it is judged that the electric forklift is in the driving discharge state or performing other high-power operating conditions. At this time, combined with the battery cell meeting the temperature threshold 1 and temperature threshold 2 conditions, the battery status assessment module can turn on the heating strategy. When the discharge current or discharge voltage does not reach the current threshold or voltage threshold, the heating strategy is not executed to save energy.

[0045] In one embodiment, S111 further includes: S112. If the heating strategy activation condition is met, start the heat cycle condition and determine whether the heating condition is met. When the temperature of the heat transfer medium is less than or equal to the temperature threshold 3, the heating condition is determined to be met; when the temperature of the heat transfer medium is greater than or equal to the temperature threshold 4, the heating condition is determined not to be met.

[0046] Among them, the thermal cycle condition is that after the heating strategy is started, the battery status evaluation module sends a start signal to the water pump to make the heat transfer medium circulate in the flow channel.

[0047] Among them, when the temperature sensor 2 in the heat transfer device detects that the temperature of the heat transfer medium is less than or equal to the temperature threshold 3, the battery status evaluation module determines that the heating conditions are met and sends a start signal to the heater. When the temperature sensor 2 in the heat transfer device detects that the temperature of the heat transfer medium is greater than or equal to the temperature threshold 4, the battery status evaluation module determines that the heating conditions are not met, and traces back to see whether the previous signal sent to the heater is a start signal. If so, a shutdown signal is sent to the heater; otherwise, no operation is performed. The above operation makes the temperature of the heat transfer medium circulating in the flow channel greater than the temperature threshold 3; when the temperature of the heat transfer medium is greater than or equal to the temperature threshold 4, heating is stopped to reduce energy consumption.

[0048] In one embodiment, S110 further includes: S113. When the heating strategy activation condition is not met, the monitoring state is maintained.

[0049] When the average temperature monitored by the temperature sensor 1 arranged in the battery cell is greater than the temperature threshold 1, or the minimum temperature is greater than the temperature threshold 2, it is determined that the heating strategy activation condition is not met, and the monitoring state is maintained.

[0050] Optionally, S100 further includes:

[0051] S120. Determine whether the cooling strategy activation condition is met. The cooling strategy activation condition includes that the average temperature of the battery cell is greater than or equal to the temperature threshold 3, and the minimum temperature of the battery cell is greater than or equal to the temperature threshold 4.

[0052] When the average temperature monitored by the temperature sensor 1 set in the battery cell is greater than or equal to the temperature threshold 3, and the minimum temperature is greater than or equal to the temperature threshold 4, it is judged that the cooling strategy activation condition is met. At this time, the temperature inside the battery pack is too high, and the battery status assessment module can ignore other collected signals and activate the cooling strategy.

[0053] In one embodiment, S120 further includes: S121. If the refrigeration strategy activation condition is met, the cold cycle condition is started, and it is determined whether the cooling condition is met. When the temperature of the heat transfer medium is less than or equal to the temperature threshold 3, it is determined that the cooling condition is met; when the temperature of the heat transfer medium is less than or equal to the temperature threshold 4, it is determined that the cooling condition is not met.

[0054] Among them, the cold cycle condition is that after the refrigeration strategy is started, the battery status assessment module sends a start signal to the water pump to make the heat transfer medium circulate in the flow channel.

[0055] Among them, when the temperature sensor 2 in the heat transfer device detects that the temperature of the heat transfer medium is less than or equal to the temperature threshold 3, the battery status evaluation module determines that the cooling condition is met and sends a start signal to the refrigerator. When the temperature sensor 2 in the heat transfer device detects that the temperature of the heat transfer medium is less than or equal to the temperature threshold 4, the battery status evaluation module determines that the cooling condition is not met, and traces back to see whether the previous signal sent to the refrigerator is a start signal. If so, a shutdown signal is sent to the refrigerator; otherwise, no operation is performed. The above operation makes the temperature of the heat transfer medium circulating in the flow channel less than the temperature threshold 3; when the temperature of the heat transfer medium is less than or equal to the temperature threshold 4, the refrigerator stops working to reduce energy consumption.

[0056] In one implementation, S120 further includes: S122. When the refrigeration strategy activation condition is not met, the monitoring state is maintained.

[0057] When the average temperature monitored by the temperature sensor 1 arranged in the battery cell is less than the temperature threshold 3, or the minimum temperature is less than the temperature threshold 4, it is determined that the cooling strategy activation condition is not met, and the monitoring state is maintained.

[0058] S200. If yes, determine whether to turn on cooling or heating according to the operation information.

[0059] The operation information includes the remaining battery power and the external ambient temperature. When the remaining battery power is too low, executing the heating strategy or cooling strategy will accelerate the power consumption and affect the remaining operation time of the electric forklift. When the external ambient temperature is too high, executing the heating strategy may further increase the battery pack temperature; when the external ambient temperature is too low, executing the cooling strategy may further reduce the battery pack temperature.

[0060] Optionally, S200 includes: S210. Detect the remaining power of the battery pack. When the remaining power of the battery pack is greater than or equal to the power threshold, execute S100; otherwise, maintain the monitoring state.

[0061] When the remaining power of the battery pack is greater than or equal to the power threshold, the battery status evaluation module performs S100 operation. When the remaining power of the battery pack is lower than the power threshold, the heating strategy or the cooling strategy is not executed.

[0062] Optionally, S200 also includes: S220. When the external environment temperature is greater than or equal to the temperature threshold value five, the heating strategy is not executed; when the external environment temperature is less than or equal to the temperature threshold value six, the cooling strategy is not executed.

[0063] After the battery status evaluation module determines whether to execute the heating strategy, it collects the external environment temperature signal monitored by temperature sensor three; if the external environment temperature signal is less than temperature threshold five, S100 is executed; if the external environment temperature signal is greater than or equal to temperature threshold five, the heating strategy is not executed, and the monitoring state is maintained. After the battery status evaluation module determines whether to execute the cooling strategy, it collects the external environment temperature signal monitored by temperature sensor three; if the external environment temperature signal is greater than temperature threshold six, S100 is executed; if the external environment temperature signal is less than or equal to temperature threshold six, the cooling strategy is not executed, and the monitoring state is maintained. The above operation monitors the ambient temperature, and does not execute the cooling strategy when the ambient temperature is too high, and does not execute the heating strategy when the ambient temperature is too low, so as to save energy.

[0064] S300. If the heating strategy is executed, turn on the heater and the refrigerator; if the cooling strategy is executed, turn on the refrigerator.

[0065] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0066] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A combined working condition test method for electric forklift batteries, characterized in that: The method comprises the following steps: determining whether to execute a heating strategy or a cooling strategy according to the battery temperature and the temperature of the heat transfer medium; If yes, determine whether to turn on cooling or heating based on the operation information; If the heating strategy is executed, the heater is turned on; if the cooling strategy is executed, the refrigerator is turned on.

2. The electric forklift battery combined working condition testing method according to claim 1, characterized in that: Determine whether the heating strategy activation condition is met; the heating strategy activation condition includes that the average temperature of the battery cell is less than or equal to temperature threshold 1, and the minimum temperature of the battery cell is less than or equal to temperature threshold 2.

3. A combined operating condition test method for electric forklift batteries according to claim 1 or 2, characterized in that: Determine whether the discharge current and discharge voltage of the battery pack have reached a threshold value; if so, execute the heating strategy; when the activation condition of the heating strategy is not met, maintain the monitoring state.

4. A combined operating condition test method for electric forklift batteries according to claim 1 or 2, characterized in that: If the heating strategy activation condition is met, the heat cycle condition is started, and it is determined whether the heating condition is met; When the temperature of the heat transfer medium is less than or equal to the temperature threshold 3, it is determined that the heating condition is met; When the temperature of the heat transfer medium is greater than or equal to the temperature threshold 4, it is determined that the heating condition is not met.

5. The electric forklift battery combined working condition testing method according to claim 4, characterized in that: The thermal cycle condition is that after the heating strategy is started, a start signal is sent to the water pump to make the heat transfer medium circulate in the flow channel.

6. The electric forklift battery combined working condition testing method according to claim 1, characterized in that: Determine whether the cooling strategy activation condition is met; the cooling strategy activation condition includes that the average temperature of the battery cell is greater than or equal to temperature threshold three, and the minimum temperature of the battery cell is greater than or equal to temperature threshold four.

7. A combined operating condition test method for electric forklift batteries according to claim 1 or 6, characterized in that: If the refrigeration strategy activation conditions are met, the cold cycle conditions are started, and it is determined whether the temperature reduction conditions are met; When the temperature of the heat transfer medium is less than or equal to the temperature threshold 3, it is determined that the cooling condition is met; When the temperature of the heat transfer medium is less than or equal to the temperature threshold 4, it is determined that the temperature reduction condition is not met; when the refrigeration strategy activation condition is not met, the monitoring state is maintained.

8. The electric forklift battery combined working condition testing method according to claim 7, characterized in that: The cold cycle condition is that after the refrigeration strategy is started, a start signal is sent to the water pump to make the heat transfer medium circulate in the flow channel.

9. The electric forklift battery combined working condition testing method according to claim 1, characterized in that: Detect the remaining power of the battery pack. When the remaining power of the battery pack is greater than or equal to the power threshold, execute the heating strategy or the cooling strategy; otherwise, maintain the monitoring state.

10. The electric forklift battery combined working condition testing method according to claim 1, characterized in that: The external environment temperature is detected. When the external environment temperature is greater than or equal to a temperature threshold of five, the heating strategy is not executed; when the external environment temperature is less than or equal to a temperature threshold of six, the cooling strategy is not executed.

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