Charger with battery heating function

Abstract

The invention relates to the field of chargers, and discloses a charger with a battery heating function, and the main points of the technical scheme are that the charger comprises a charging module, a heating module, a temperature collection module, a heating control module and a charging performance evaluation module, and the charging module is used for charging a battery; the heating module is used for heating the battery; the temperature acquisition module is used for acquiring environment temperature and battery temperature; the heating control module is configured with a preheating strategy, the heating control module calculates environment heat dissipation efficiency, heater efficiency and charging heat production according to the preheating strategy so as to obtain temperature correlation, and the temperature correlation reflects the relation among heater power, charging power and battery charging temperature; the charging performance evaluation module is pre-trained with a charging performance evaluation model, a target charging temperature is obtained based on the charging performance evaluation model, the target charging temperature is output to the heating control module to enable the heater to heat according to target power, and the target power and the target charging temperature conform to temperature correlation.

Description

Technical Field

[0001] The invention relates to the field of chargers, and more particularly to a charger with a battery heating function. Background Art

[0002] In today's transportation sector, electric bicycles have rapidly gained widespread popularity around the world due to their convenience and environmental friendliness. As one of the main power sources for electric bicycles, the performance of lead-acid batteries is directly related to the user experience and market development of electric bicycles. With the continuous growth of the number of electric bicycles, research on the performance optimization of lead-acid batteries has become increasingly in-depth. The charging and discharging performance of lead-acid batteries is extremely sensitive to the ambient temperature of use. Especially in the cold winter, the low temperature environment will significantly deteriorate the charging and discharging performance of the battery, thereby seriously shortening the mileage of the electric bicycle. To solve this problem, designers proposed the idea of ​​installing a heating device inside the battery to heat the battery. This idea attempts to improve the performance of the battery in a low temperature environment to a certain extent, but it has exposed many disadvantages in actual applications.

[0003] From a cost perspective, purchasing heating modules independently undoubtedly greatly increases the cost of batteries. Each battery needs to be equipped with a dedicated heating module, which not only increases the cost of raw material procurement, but also increases the overall production and assembly cost of the battery, causing the terminal price of electric bicycles to rise, which to a certain extent affects the market competitiveness of the product; in terms of reliability and safety, once the heating module fails, it will cause a series of serious problems. If the heating module fails and causes it to continue to heat the battery, the battery temperature will continue to rise, and may eventually be damaged due to overheating, directly shortening the service life of the battery. What's more serious is that the continuous heating and discharge of the heating module will cause the battery to be seriously depleted, which will not only prevent users from using the electric bicycle normally, but may even cause the battery to be scrapped. Moreover, long-term heating and discharge are also very likely to cause serious accidents such as fires, posing a huge threat to the safety of users' lives and property; maintenance convenience is also a major problem. Since the heating module is installed inside the battery, when a failure occurs, maintenance personnel need to disassemble the battery, which is complicated and time-consuming. This not only increases the maintenance cost, but may also cause secondary damage to the battery due to improper maintenance, further affecting the battery performance and life. From the perspective of charging management, since the heating circuit is set at the battery end, the charger cannot obtain the battery temperature information in real time, and it is difficult to perform corresponding charging management accordingly. In this case, once the battery temperature rises abnormally during the charging process, the charger cannot adjust the charging strategy in time, which greatly increases the risk of thermal runaway of the battery. Once thermal runaway occurs, it will have catastrophic consequences for the battery and even the entire electric bicycle system. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a charger with a battery heating function, which is used to overcome the above-mentioned defects in the prior art, improve the charging and discharging performance of the battery in a low temperature environment, and ensure the stable operation and safe use of the electric bicycle.

[0005] To achieve the above object, the present invention provides the following technical solutions: A charger with battery heating function, comprising: A charging module, wherein the charging module is used to charge the battery; A heating module, wherein the heating module is used to heat the battery; A temperature acquisition module, which is used to collect ambient temperature and battery temperature; a heating control module, wherein the heating control module is configured with a preheating strategy, and the heating control module calculates the ambient heat dissipation efficiency, the heater efficiency, and the charging heat generation according to the preheating strategy to obtain a temperature correlation, wherein the temperature correlation reflects a relationship between the heater power, the charging power, and the battery charging temperature; A charging performance evaluation module is pre-trained with a charging performance evaluation model, a target charging temperature is obtained based on the charging performance evaluation model, and the target charging temperature is output to a heating control module so that the heater heats according to a target power, and the target power is temperature-correlated with the target charging temperature.

[0006] In the present invention, preferably, the preheating strategy includes Sequentially acquiring a first temperature change curve, a second temperature change curve, and a third temperature change curve, wherein the first temperature curve is specifically a curve of battery temperature change over time during a process in which the heating module is controlled by the first heater power to heat the battery, the second temperature change curve is specifically a curve of battery temperature change over time during a cooling process after the heating module stops working, and the third temperature change curve is specifically a curve of battery temperature change over time during a process in which the charging module is working and the heating module is controlled by the second heater power to heat the battery; calculating an environmental heat dissipation efficiency and a heater efficiency based on the first temperature change curve and the second temperature change curve; The charging heat generation is calculated based on the third temperature variation curve.

[0007] In the present invention, preferably, the charging performance evaluation module collects battery parameters at different battery temperatures, wherein the battery parameters include charging efficiency, charging speed, battery internal resistance and battery aging degree, inputs the battery parameters into the charging performance evaluation model to obtain a charging performance score, compares the charging performance scores at different battery temperatures, and uses the battery temperature with the highest charging performance score as the target charging temperature.

[0008] In the present invention, preferably, the calculation formula of the charging performance evaluation model is specifically: ; Where Q represents the charging performance score, It represents charging efficiency, S represents charging speed, R represents battery internal resistance, and A represents battery aging degree.

[0009] In the present invention, preferably, the calculation formula of the environmental heat dissipation efficiency is as follows: ; in represents the environmental heat dissipation efficiency, m represents the mass of the battery; c represents the specific heat capacity of the battery material; Indicates the reduction in battery temperature during the cooling process; Indicates the average temperature difference between the battery and the environment during the cooling process; represents the heat dissipation coefficient; A represents the surface area of ​​the battery in contact with the environment; Indicates the cooling time.

[0010] In the present invention, preferably, the calculation formula of the heater efficiency is as follows: ; in represents the heater efficiency, Indicates the increase in battery temperature during the heating process; P indicates the heater power; Indicates the heating time.

[0011] In the present invention, preferably, the heating control module is configured with a temperature intervention strategy. When the rate of change of the ambient temperature is greater than the preset temperature change rate, the heater power is adjusted based on the temperature intervention strategy. The temperature intervention strategy includes reducing the heater power, judging the battery temperature change, and if the battery temperature has a decreasing trend, gradually increasing the heater power until the battery temperature is stable; if the battery temperature still has an increasing trend, gradually reducing the heater power until the battery temperature is stable, and recording the correlation between the ambient heat dissipation efficiency and the ambient temperature.

[0012] Beneficial effects of the present invention: 1. The present invention preheats the battery before formal charging, heats the battery to a certain temperature, and then cools it, so as to calculate the environmental heat dissipation efficiency and the heater efficiency. Then, the charging heat generation can be obtained by charging, thereby obtaining the temperature correlation, that is, the relationship between the heater power, the charging power and the battery charging temperature. Then, by judging the correlation between the charging performance and the charging temperature quality inspection when the battery is charged, the heater power is set, so that the battery can be charged with the optimal charging performance; 2. The heating control module calculates the ambient heat dissipation efficiency, heater efficiency and charging heat generation according to the preheating strategy, and obtains the temperature correlation step. First, the first, second and third temperature change curves are obtained in sequence, and the ambient heat dissipation efficiency, heater efficiency and charging heat generation are calculated based on these curves, respectively, so as to quantify the relationship between multiple key factors affecting the battery temperature, which helps the charger to accurately grasp the relationship between the heater power, charging power and battery charging temperature under different conditions, and can more accurately adjust the heating and charging parameters according to the actual environment and the battery's own characteristics, thereby improving the accuracy of the heating and charging process, avoiding damage to the battery due to improper heating or charging, and improving the battery charging efficiency and service life; 3. By providing a specific calculation formula for the charging performance evaluation model, a quantitative comprehensive evaluation of multiple battery performance parameters is achieved. The charging performance score calculated using this formula can intuitively reflect the comprehensive performance of the battery at different battery temperatures, providing a scientific and accurate quantitative basis for determining the target charging temperature, avoiding the subjectivity and uncertainty of human experience judgment, and is conducive to improving the accuracy of performance judgment and improving battery performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a structural schematic diagram of a power conversion unit in the present invention; Figure 3 is a schematic structural diagram of a battery heating unit in the present invention; Figure 4 It is a structural schematic diagram of the constant current and constant voltage control unit in the present invention; Figure 5 It is a structural schematic diagram of the MCU control unit in the present invention; DETAILED DESCRIPTION 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.

[0014] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0015] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0016] Please also see Figures 1 to 5 This embodiment provides a charger with a battery heating function, including A charging module, wherein the charging module is used to charge the battery; A heating module, wherein the heating module is used to heat the battery; A temperature acquisition module, which is used to collect ambient temperature and battery temperature; a heating control module, wherein the heating control module is configured with a preheating strategy, and the heating control module calculates the ambient heat dissipation efficiency, the heater efficiency, and the charging heat generation according to the preheating strategy to obtain a temperature correlation, wherein the temperature correlation reflects a relationship between the heater power, the charging power, and the battery charging temperature; A charging performance evaluation module is pre-trained with a charging performance evaluation model, a target charging temperature is obtained based on the charging performance evaluation model, and the target charging temperature is output to a heating control module so that the heater heats according to a target power, and the target power is temperature-correlated with the target charging temperature.

[0017] The present invention preheats the battery before formal charging, heats the battery to a certain temperature, and then cools it, so that the environmental heat dissipation efficiency and the heater efficiency can be calculated. Then, the charging heat generation can be obtained by charging, thereby obtaining the temperature correlation, that is, the relationship between the heater power, the charging power and the battery charging temperature. Then, by judging the correlation between the charging performance and the charging temperature quality inspection when the battery is charging, the heater power can be set so that the battery can be charged with the optimal charging performance.

[0018] In the present invention, preferably, the preheating strategy includes Sequentially acquiring a first temperature change curve, a second temperature change curve, and a third temperature change curve, wherein the first temperature curve is specifically a curve of battery temperature change over time during a process in which the heating module is controlled by the first heater power to heat the battery, the second temperature change curve is specifically a curve of battery temperature change over time during a cooling process after the heating module stops working, and the third temperature change curve is specifically a curve of battery temperature change over time during a process in which the charging module is working and the heating module is controlled by the second heater power to heat the battery; calculating an environmental heat dissipation efficiency and a heater efficiency based on the first temperature change curve and the second temperature change curve; The charging heat generation is calculated based on the third temperature variation curve.

[0019] The first, second, and third temperature change curves are obtained in sequence, and the environmental heat dissipation efficiency, heater efficiency, and charging heat generation are calculated based on these curves, respectively, to quantify the relationship between multiple key factors affecting battery temperature, which helps the charger to accurately grasp the relationship between heater power, charging power, and battery charging temperature under different conditions, and can more accurately adjust the heating and charging parameters according to the actual environment and the characteristics of the battery itself, thereby improving the accuracy of the heating and charging process, avoiding damage to the battery due to improper heating or charging, and improving the battery charging efficiency and service life. Heat and charge once, then cool to obtain the environmental heat dissipation coefficient and the impact of residual heat; charge when heating for the second time, calculate the thermal effect brought by charging, and you can estimate the heat generation during charging, and you can estimate the charging power-heater power-battery temperature to control the balance.

[0020] In the present invention, preferably, the charging performance evaluation module collects battery parameters at different battery temperatures, wherein the battery parameters include charging efficiency, charging speed, battery internal resistance and battery aging degree, inputs the battery parameters into the charging performance evaluation model to obtain a charging performance score, compares the charging performance scores at different battery temperatures, and uses the battery temperature with the highest charging performance score as the target charging temperature.

[0021] In the present invention, preferably, the calculation formula of the charging performance evaluation model is specifically: ; Where Q represents the charging performance score, It represents charging efficiency, S represents charging speed, R represents battery internal resistance, and A represents battery aging degree.

[0022] To quantify the charging performance of a battery, multiple factors need to be considered comprehensively. This formula will take into account the effects of charging efficiency, charging speed, changes in battery internal resistance, and battery aging on charging performance: Indicates charging efficiency: the ratio of the actual amount of electricity charged into the battery to the amount of electricity output by the charger, generally measured by an electricity meter, with a value range of (0-1). For example, if the charger outputs 100Wh of electricity and the battery actually charges 85Wh, then the charging efficiency is =85%=0.85.

[0023] Charging speed S: measured by the increase in battery power per unit time. Assuming the battery capacity is C (unit: Ah or mAh), and the time taken to charge from power Q_1 to Q_2 is t (unit: hours or minutes), then the charging speed S = (Q_2-Q_1) / t. For example, if the battery capacity is 3000mAh, and it takes 1 hour to charge from 20% (i.e. Q_1=3000mAh×0.2=600mAh) to 80% (i.e. Q_2=3000mAh×0.8=2400mAh), then the charging speed S = (2400mAh-600mAh) / 1h=1800mAh / h.

[0024] Internal resistance change rate R: The initial internal resistance of the battery is R_0. After a certain number of charging times or use time, the internal resistance changes to R_1. The internal resistance change rate R = (R_1-R_0) / R_0. The internal resistance change rate reflects the change of the internal resistance of the battery with use. The greater the change in internal resistance, the greater the negative impact on charging performance.

[0025] Battery aging degree A: It can be measured by the battery capacity attenuation ratio. Assuming the initial battery capacity is C_0 and the current actual capacity is C_1, the battery aging degree A=1-(C_1)×(C_0). The higher the aging degree, the worse the battery performance.

[0026] Formula explanation: -The numerator (η×S) represents the charging performance under ideal conditions, combining the charging efficiency and charging speed. The higher the charging efficiency and the faster the charging speed, the larger the value of this part.

[0027] -The denominator ((1+R)×(1+A)) is used to correct the negative impact of internal resistance change and battery aging on charging performance. The greater the internal resistance change rate R and the battery aging degree A, the larger the denominator and the smaller the overall CPI value, reflecting the worse charging performance.

[0028] In the present invention, preferably, the calculation formula of the environmental heat dissipation efficiency is as follows: ; in represents the environmental heat dissipation efficiency, m represents the mass of the battery; c represents the specific heat capacity of the battery material; Indicates the reduction in battery temperature during the cooling process; Indicates the average temperature difference between the battery and the environment during the cooling process; represents the heat dissipation coefficient; A represents the surface area of ​​the battery in contact with the environment; Indicates the cooling time.

[0029] In the present invention, preferably, the calculation formula of the heater efficiency is as follows: ; in represents the heater efficiency, Indicates the increase in battery temperature during the heating process; P indicates the heater power; Indicates the heating time.

[0030] In the present invention, preferably, the heating control module is configured with a temperature intervention strategy. When the rate of change of the ambient temperature is greater than the preset temperature change rate, the heater power is adjusted based on the temperature intervention strategy. The temperature intervention strategy includes reducing the heater power, judging the battery temperature change, and if the battery temperature has a decreasing trend, gradually increasing the heater power until the battery temperature is stable; if the battery temperature still has an increasing trend, gradually reducing the heater power until the battery temperature is stable, and recording the correlation between the ambient heat dissipation efficiency and the ambient temperature.

[0031] The following is a detailed description based on the order of the modules combined with the circuit part.

[0032] 1. Charging module, including power conversion unit and constant current and constant voltage control unit 1. Power conversion unit For the circuit diagram of the power conversion unit, see Figure 2 The power conversion unit is used to convert the input AC power ACL and ACN into DC power DC+ and DC- suitable for battery charging. Input side: 220V AC is rectified by FU1 (6.3A), BR1 (GBU1510), and filtered by CDO2 (400V / 150μF) to output about 300V DC. Output association: DC+ is directly connected to the U_control chip of the constant current control unit as the main power supply for charging; GND is connected to the ground of all modules to form a common reference point.

[0033] Workflow: After being protected by FU1, the 220V AC enters BR1 for rectification and is converted into pulsating DC; CDO2 filters the pulsating DC power and outputs a smooth DC power of approximately 300V; VDR1 plays the role of overvoltage protection in the circuit. When the voltage is abnormal, it will clamp the excessive voltage to protect the back-end circuit.

[0034] 2. Constant current and constant voltage control unit Constant current and constant voltage control unit, see Figure 4 The voltage DC+ converted by the power conversion unit is stabilized by the constant current and constant voltage control unit, and then forms a loop through QA1, RA1 and GND to charge the battery. Its core functions are: constant current and constant voltage charging through PWM regulation of the U_control chip, and the operational amplifier U3A and the resistor network (R22, R23, R24) form a feedback loop to monitor the output voltage / current in real time.

[0035] The constant current and constant voltage control unit is used to ensure the stability of current and voltage during charging and prevent overcharging or over-discharging of the battery. The core components include operational amplifiers U3A, U3B, feedback resistor network RO1~RO11 and PWM controller UTC81526E; it is linked with the power conversion unit through feedback FB and current detection CS pin to adjust the output in real time. The constant current and constant voltage control unit receives the I_control and U_control signals of the MCU and dynamically sets the constant current / constant voltage threshold; it controls the switching frequency of the power conversion unit through UTC81526E to adjust the output voltage / current.

[0036] Output path: Main charging circuit: DC+→QA1 (field effect transistor)→RA1 (current sampling resistor)→GND→battery BT1.

[0037] Heating module power supply: DC+→DA1 (diode)→QA2 (PMOS tube)→RL1-RL6→GND.

[0038] Control association: I_control signal (MCU pin 8): Dynamically adjusts the charging current (such as reducing the current when the temperature is too high).

[0039] SIF communication (PC2, R11, R16): transmits charging parameters (current, voltage) to the battery central control.

[0040] 2. Heating module, including battery heating unit Battery Heating Unit See Figure 3 , used to heat the battery in a low temperature environment to ensure that it works within a suitable temperature range. The voltage DC+ converted by the power conversion circuit is stabilized by the constant current and constant voltage control unit, and the other path is formed through DA1, QA2 and GND to heat the battery. Figure 2 and Figure 3 In the same figure, in fact, FU2 in the upper right corner of the power conversion unit is connected to DA1 in the battery heating unit.

[0041] 1. Hardware execution part Heating load: RL1-RL6 (6 47KΩ resistors in parallel, total power about 15W).

[0042] Control elements: QA2 (PMOS tube): The on / off is controlled by the PWM signal output by MCU pin 12.

[0043] DA1 (diode): prevents reverse current from damaging the heating circuit.

[0044] FU2 (heating fuse): short circuit protection.

[0045] 2. Control logic association Temperature trigger: RT1_in (MCU pin 9): battery temperature signal (collected by NTC1A).

[0046] Preheating strategy: When the temperature is less than 20°C, the MCU drives QA2 to turn on through Q3 to start heating.

[0047] Temperature control logic: The MCU collects the temperature signal of the battery pack through pin 9 (RT1_in).

[0048] When the battery pack temperature is lower than 20°C, pin 12 of the MCU outputs a high level signal.

[0049] This high-level signal drives Q3 (transistor) to turn on after being limited by R14.

[0050] After Q3 is turned on, the gate of QA2 is pulled low, the PMOS tube QA2 is turned on, and the current passes through DA1, QA2, RL1-RL6 and GND to form a loop to heat the battery.

[0051] When the battery pack temperature is higher than 20°C and lower than 60°C, pin 12 of the MCU outputs a low-level signal, Q3 is cut off, QA2 is turned off, and heating stops.

[0052] Overheat protection function: When the battery temperature exceeds 60°C, the charger will reduce the output current to prevent the battery from overheating.

[0053] When the battery temperature exceeds 70°C, the charger will cut off the charging circuit to prevent thermal runaway of the battery.

[0054] Heating efficiency calculation: The heater efficiency is calculated based on the power (P=U² / R) and heating time (t) of RL1-RL6, combined with the battery temperature rise ΔT.

[0055] 3. Temperature acquisition module 1. Data collection point Battery temperature: NTC1A (Pin 9, RT1_IN).

[0056] Charger temperature: NTC2 (assumed via pin 10, RT2_in).

[0057] Ambient temperature: Indirectly calculated through the cooling curve (second temperature curve) (MCU is required to record the cooling rate after heating stops).

[0058] 2. Data Flow ADC conversion: The temperature signal is converted into a digital value by the ADC built into the MCU.

[0059] Heating control module: Real-time temperature is used to determine whether to start or stop heating (20°C threshold).

[0060] Charging performance evaluation module: temperature data is used as input parameters to calculate charging efficiency (η), internal resistance (R), etc.

[0061] 4. Heating control module, including MCU control unit core MCU control unit see Figure 5 ,The MCU control unit is the core control module of the system, responsible for receiving sensor signals, such as temperature, current, voltage, logic judgment and output control instructions. Specifically, the temperature sensor (NTC) is connected through the pins RT1_in and RT2_in to monitor the battery temperature in real time; it interacts with the constant current and constant voltage control unit through the I_control and U_control signals to dynamically adjust the charging parameters; it controls the battery heating unit, triggers the SCR and fan FAN1 through the heat signal, and realizes temperature management.

[0062] The MCU control unit receives feedback signals from the temperature sensor NTC1A and the current detection Isen, and outputs control signals to the constant current and constant voltage unit to adjust the charging parameters and the heating unit to adjust the heating parameters.

[0063] 1. Algorithm Implementation Preheating strategy: The first temperature curve: QA2 is turned on, and the temperature rise rate of RL1-RL6 is recorded when it is heated.

[0064] Second temperature curve: QA2 is turned off and the natural cooling rate is recorded for calculating the ambient heat dissipation efficiency.

[0065] The third temperature curve: Charging and heating are carried out simultaneously. To calculate the heat generated by charging, the charging current and the internal resistance of the battery must be considered.

[0066] Temperature intervention strategies: When the ambient temperature change rate is greater than the threshold, the PWM duty cycle of QA2 is dynamically adjusted to maintain the target temperature.

[0067] 2. Interaction with other modules Charging module: adjusts the charging current through the I_control signal (such as reducing the current when the temperature is greater than 60°C).

[0068] Charging performance evaluation module: receives target temperature instructions and adjusts heating power.

[0069] SIF communication: transmits real-time temperature and heating status to the battery central control.

[0070] 5. Charging performance evaluation module The charging performance evaluation module does not have a dedicated hardware circuit and is implemented by the MCU through software.

[0071] 1. Data Input Battery parameters: Charging efficiency (η) = actual charging capacity / theoretical capacity (needs to be calculated in combination with charging current and time).

[0072] Charging speed (S) = charging capacity / charging time.

[0073] Battery internal resistance (R) = voltage drop / charging current (sampled by RA1).

[0074] Battery aging degree (A) = historical charging cycle number (requires SIF communication to obtain from the battery central control).

[0075] 2. Model Output Target temperature: Calculate the Q value at different temperatures and select the temperature with the maximum Q.

[0076] Command transmission: Send the target temperature to the heating control module to adjust the heating power.

[0077] Key data flows between modules: 1) Temperature collection → heating control: NTC1A → MCU pin 9 → preheating strategy calculation → QA2 on / off.

[0078] 2) Charging performance evaluation → heating control: Target temperature command → MCU pin 12 → PWM adjusts QA2 duty cycle.

[0079] 3) Heating control → charging module: High temperature signal (>60℃) → I_control → U_control current reduction.

[0080] 4) SIF communication: Charging parameters (current, temperature) → PC2 → battery central control → display and feedback.

[0081] From the above working principle, we can know that the charger can not only complete the automatic heating management of the battery, but also complete the battery charging management to prevent the battery from swelling; at the same time, it can also transmit the charging progress, battery temperature and other information to the battery central control terminal, so as to display the charging information to the user. It effectively overcomes many problems mentioned in the background.

[0082] The above are only preferred embodiments of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A charger with battery heating function, characterized in that: include A charging module, wherein the charging module is used to charge the battery; A heating module, wherein the heating module is used to heat the battery; A temperature acquisition module, which is used to collect ambient temperature and battery temperature; a heating control module, wherein the heating control module is configured with a preheating strategy, and the heating control module calculates the ambient heat dissipation efficiency, the heater efficiency, and the charging heat generation according to the preheating strategy to obtain a temperature correlation, wherein the temperature correlation reflects a relationship between the heater power, the charging power, and the battery charging temperature; A charging performance evaluation module is pre-trained with a charging performance evaluation model, a target charging temperature is obtained based on the charging performance evaluation model, and the target charging temperature is output to a heating control module so that the heater heats according to a target power, and the target power is temperature-correlated with the target charging temperature.

2. The charger with battery heating function according to claim 1, characterized in that: The preheating strategy includes Sequentially acquiring a first temperature change curve, a second temperature change curve, and a third temperature change curve, wherein the first temperature curve is specifically a curve of battery temperature change over time during a process in which the heating module is controlled by the first heater power to heat the battery, the second temperature change curve is specifically a curve of battery temperature change over time during a cooling process after the heating module stops working, and the third temperature change curve is specifically a curve of battery temperature change over time during a process in which the charging module is working and the heating module is controlled by the second heater power to heat the battery; calculating an environmental heat dissipation efficiency and a heater efficiency based on the first temperature change curve and the second temperature change curve; The charging heat generation is calculated based on the third temperature variation curve.

3. The charger with battery heating function according to claim 1, characterized in that: The charging performance evaluation module collects battery parameters at different battery temperatures, wherein the battery parameters include charging efficiency, charging speed, battery internal resistance and battery aging degree, inputs the battery parameters into a charging performance evaluation model to obtain a charging performance score, compares the charging performance scores at different battery temperatures, and uses the battery temperature with the highest charging performance score as the target charging temperature.

4. The charger with battery heating function according to claim 3, characterized in that: The calculation formula of the charging performance evaluation model is specifically as follows: ； Where Q represents the charging performance score, It represents charging efficiency, S represents charging speed, R represents battery internal resistance, and A represents battery aging degree.

5. The charger with battery heating function according to claim 1, characterized in that: The calculation formula of the environmental heat dissipation efficiency is as follows: ; in represents the environmental heat dissipation efficiency, m represents the mass of the battery; c represents the specific heat capacity of the battery material; Indicates the reduction in battery temperature during the cooling process; Indicates the average temperature difference between the battery and the environment during the cooling process; represents the heat dissipation coefficient; A represents the surface area of ​​the battery in contact with the environment; Indicates the cooling time.

6. The charger with battery heating function according to claim 1, characterized in that: The calculation formula of the heater efficiency is as follows: ； in represents the heater efficiency, m represents the mass of the battery; c represents the specific heat capacity of the battery material; Indicates the increase in battery temperature during the heating process; P indicates the heater power; Indicates the heating time.

7. The charger with battery heating function according to claim 1, characterized in that: The heating control module is configured with a temperature intervention strategy. When the rate of change of the ambient temperature is greater than the preset temperature change rate, the heater power is adjusted based on the temperature intervention strategy. The temperature intervention strategy includes reducing the heater power, judging the battery temperature change, and if the battery temperature has a decreasing trend, gradually increasing the heater power until the battery temperature is stable; if the battery temperature still has an increasing trend, gradually reducing the heater power until the battery temperature is stable, and recording the correlation between the ambient heat dissipation efficiency and the ambient temperature.

Images