Temperature adjusting system of battery pack

Abstract

The utility model provides a temperature adjusting system of a battery pack, which belongs to the technical field of battery packs, the battery pack comprises a plurality of modules, and the temperature adjusting system comprises a heating assembly, a refrigerating assembly and a temperature control circuit; the heating assembly comprises heaters corresponding to the modules in number, and the refrigerating assembly comprises refrigerators corresponding to the modules in number; the heaters and the refrigerators are arranged in one-to-one correspondence with the modules, and the heaters and the refrigerators are connected with the temperature control circuit; the temperature control circuit is used for heating the corresponding module through the heater and is also used for refrigerating the corresponding module through the refrigerator, the battery pack is divided into a plurality of modules, and then each module is independently heated or refrigerated, so that compared with heating or refrigerating of the whole battery pack, the battery pack has higher pertinence and rationality; and the temperature adjusting effect of the battery pack is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery pack technical field especially relates to a temperature regulation system of battery pack. BACKGROUND

[0002] Current new energy industry develops rapidly, and new energy vehicles, new energy buses and energy storage industries develop rapidly, and the use range of battery pack is more and more extensive, there are low temperature environment in the north, and there are high temperature environment in the south. Because the battery pack supplies power to the whole vehicle is a series of chemical reactions, and is greatly affected by temperature, when the temperature is low, the chemical performance is poor, and the discharged power is less, when the temperature is high, the stability of the battery is poor, and thermal runaway is easy to occur, and the battery pack is ignited. In addition, the battery pack will also generate heat in the charging and discharging process, and the temperature of the battery pack is always changing, which causes certain influence on the measurement accuracy of some battery parameters, and the charging and discharging performance of the battery pack is best in the normal temperature range, and more power can be discharged, and the safety is also relatively high. Therefore, it is very important to keep the temperature of the battery pack in the normal temperature state with the best performance.

[0003] Now the battery pack is equipped with a thermal management function, but the thermal management can only heat or cool the whole battery pack at the same time, and when the local temperature of the battery pack is relatively high or low, the heating or cooling effect of the battery pack is poor. UTILITY MODEL CONTENTS

[0004] The utility model provides a temperature regulation system of battery pack to solve the defect that the temperature regulation effect of battery pack in prior art is poor.

[0005] Firstly, the utility model provides a temperature regulation system of battery pack, and the battery pack includes a plurality of modules, and the temperature regulation system includes a heating assembly, a refrigeration assembly and a temperature control circuit.

[0006] The heating assembly includes a heater corresponding to the number of modules, and the refrigeration assembly includes a refrigerator corresponding to the number of modules.

[0007] The heater and the refrigerator are respectively arranged one by one with the modules, and the heater and the refrigerator are connected with the temperature control circuit.

[0008] The temperature control circuit is used for heating the corresponding module through the heater, and is also used for refrigerating the corresponding module through the refrigerator.

[0009] According to the temperature regulation system of the battery pack, each heater is provided with a heating switch, and each refrigerator is provided with a refrigerator valve.

[0010] The temperature control circuit comprises a starting module, a temperature detection module and a control module.

[0011] The starting module and the temperature detection module are connected with the control module.

[0012] The starting module is used for controlling the starting or stopping of the temperature control circuit, the temperature detection module is used for detecting the temperature of each module, and the control module is used for adjusting the temperature of the module.

[0013] The control module comprises control components corresponding to the number of modules, and each control component comprises a comparison unit and a switch unit.

[0014] The comparison unit is connected with the temperature detection module, and the switch unit is further connected with the comparison unit.

[0015] The comparison unit is used for comparing the current temperature of the module with a target temperature, and the switch unit is used for controlling the working state of the heater or the refrigerator based on the result of the comparison unit.

[0016] The comparison unit comprises a first comparison circuit and a second comparison circuit.

[0017] The first comparison circuit and the second comparison circuit are connected with the temperature detection module, and the first comparison circuit is further connected with the second comparison circuit.

[0018] The first comparison circuit is used for controlling the conduction or disconnection of the corresponding heater, and the second comparison circuit is used for controlling the conduction or disconnection of the corresponding refrigerator.

[0019] The first comparison circuit comprises a first comparator, a first triode and a second triode, and the second comparison circuit comprises a second comparator, a third triode and a fourth triode.

[0020] The base of the first triode is connected with the temperature detection module, the emitter of the first triode is connected with a power module, the collector of the first triode is connected with the emitter of the second triode, the base of the second triode is connected with the temperature detection module, and the collector of the second triode is grounded.

[0021] The base of the third triode is connected with the temperature detection module, the emitter of the third triode is connected with the power module, the collector of the third triode is connected with the emitter of the fourth triode, the base of the fourth triode is connected with the temperature detection module, and the collector of the fourth triode is grounded;

[0022] The input end of the first comparator is connected with the temperature detection module and the emitter of the first triode respectively, and the output end of the first comparator is connected with the switch unit;

[0023] The input end of the second comparator is connected with the temperature detection module and the emitter of the third triode respectively, and the output end of the second comparator is connected with the switch unit.

[0024] According to the temperature adjusting system of the battery pack, the first comparison circuit further comprises a first capacitor, and the second comparison circuit further comprises a second capacitor;

[0025] One end of the first capacitor is connected with the emitter of the first triode, and the other end is grounded; one end of the second capacitor is connected with the emitter of the third triode, and the other end is grounded.

[0026] According to the temperature adjusting system of the battery pack, the switch unit comprises a heating switch controller and a refrigerator valve controller;

[0027] The heating switch controller is connected with the first comparison circuit, and the refrigerator valve controller is connected with the second comparison circuit;

[0028] The heating switch controller is used for controlling the conduction or disconnection of the heating switch, and the refrigerator valve controller is used for controlling the conduction or disconnection of the refrigerator valve.

[0029] According to the temperature adjusting system of the battery pack, the heating switch controller comprises a fifth triode and a sixth triode, and the refrigerator valve controller comprises a seventh triode, an eighth triode and a ninth triode;

[0030] The base of the fifth triode is connected with the second comparison circuit, the emitter of the fifth triode is connected with the first comparison circuit, the collector of the fifth triode is connected with the base of the sixth triode, the emitter of the sixth triode is connected with the power module, and the collector of the sixth triode is connected with the heating switch;

[0031] The base of the seventh transistor is connected with the first comparison circuit, the emitter of the seventh transistor is connected with the second comparison circuit, the collector of the seventh transistor is connected with the base of the eighth transistor and the ninth transistor respectively, the emitters of the eighth transistor and the ninth transistor are connected with the power module, the collector of the eighth transistor is connected with the inlet valve of the refrigerator valve, and the collector of the ninth transistor is connected with the outlet valve of the refrigerator valve.

[0032] According to the temperature adjusting system of the battery pack, the temperature detection module comprises a temperature sensor and a third comparator.

[0033] The temperature sensor is connected with the input end of the third comparator, and the output end of the third comparator is connected with the control module.

[0034] The temperature adjusting system of the battery pack comprises a heating assembly, a refrigeration assembly and a temperature control circuit. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical scheme in the utility model or the prior art, the following will be a simple introduction to the drawings needed to be used in the embodiment or the prior art description, and obviously, the following description of the drawings is some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creative labor.

[0036] Figure 1 It is the heating principle schematic diagram of the temperature adjusting system of the battery pack provided by the embodiment;

[0037] Figure 2 It is the refrigeration principle schematic diagram of the temperature adjusting system of the battery pack provided by the embodiment;

[0038] Figure 3 It is the principle schematic diagram of the temperature control circuit provided by the embodiment;

[0039] Figure 4 It is Figure 3 the circuit principle diagram of the starting module in

[0040] Figure 5 is Figure 3 Part of the circuit schematic diagram of the temperature detection module in

[0041] Figure 6 is Figure 3 Part of the circuit schematic diagram of the control module in DETAILED DESCRIPTION

[0042] In order to make the purpose, technical scheme and advantages of the utility model more clear, the technical scheme in the utility model will be described clearly and completely below in combination with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0043] Figure 1 is the heating principle schematic diagram of the temperature regulation system of the battery pack provided by the embodiment, Figure 2 is the refrigeration principle schematic diagram of the temperature regulation system of the battery pack provided by the embodiment.

[0044] As Figure 1 shown, the utility model embodiment provides a kind of temperature regulation system of battery pack, battery pack includes multiple module, temperature regulation system includes: heating component, refrigeration component and temperature control circuit;Heating component includes the heater corresponding to the number of module, refrigeration component includes the cooler corresponding to the number of module;Heater, cooler are respectively set one-to-one with module, heater and cooler are connected with temperature control circuit;Temperature control circuit is used to heat corresponding module by heater, also be used to cool corresponding module by cooler.

[0045] In a specific implementation process, firstly, the thermal management of the battery pack is grouped, which can be grouped according to the number of modules, one module can be a group, or multiple modules can be a group, and the purpose of grouping is mainly to ensure that each group is controlled separately for thermal management control, thereby ensuring the accuracy and rationality of temperature control of each group. In this embodiment, three groups are taken as an example, each group is composed of one module, and the temperature of each module in each group can be set as a constant temperature system, that is, the temperature of the battery pack is constant at 25℃, when the temperature of the module is higher than 25℃, the module is cooled, and when the temperature of the module is lower than 25℃, the module is heated. Different modules in the same battery pack can be in heating or cooling state respectively. And in the process of heating changing into cooling, or cooling changing into heating, there is a certain time delay in the middle, for example, 10 minutes, which will not be switched immediately, and the heat management mode switching will be carried out only when the cooling condition or heating condition is met for 10 minutes continuously, thereby realizing constant temperature control of different modules in the battery pack.

[0046] In this embodiment, the battery pack has three modules, each module is provided with a corresponding heater and a cooler, and each heater is provided with a heating switch, and each cooler is provided with a cooler valve.

[0047] The heater can be a PTC heater, and the cooler can be a water cooling machine and a pump circulation mode. Figure 1 As shown in the figure, the PTC is divided into three independent heating systems according to the module, which are controlled by heating relays S1, S2 and S3 respectively, and the three PTCs can be started separately or simultaneously according to the module temperature. When there is no gun inserted, if the heating demand is met, the PTC is powered by the battery pack, and if the charging gun is inserted, the PTC is powered by the charging pile when the heating demand is met. When PTC1 needs to be heated, only S1 heating relay needs to be closed; when PTC2 needs to be heated, only S2 heating relay needs to be closed; when PTC3 needs to be heated, only S3 heating relay needs to be closed; when two or three PTCs need to be heated at the same time, different PTCs can be heated by controlling the conduction of S1, S2 and S3 heating relays. Therefore, through the separate heating mode, the temperature of each module is kept in a reasonable range.

[0048] As shown in the figure, Figure 2As shown, the liquid cooling pipe is arranged according to the module, the cooling liquid flows into the water inlet of one module and flows out of the water outlet of the module, which reduces the flow distance of the cooling liquid in the battery pack and realizes independent control of the cooling and refrigeration of different modules. When module 1 needs to be cooled, motor valves MV1 and MV2 are turned on, and motor valves MV3, MV4, MV5 and MV6 are turned off, and the cooling liquid only flows through module 1; when module 2 needs to be cooled, motor valves MV3, MV4 and MV5 are turned on, and motor valves MV1, MV2 and MV6 are turned off, and the cooling liquid only flows through module 2; when module 3 needs to be cooled, motor valve MV6 is turned on, and motor valves MV1, MV2, MV3, MV4 and MV5 are turned off, and the cooling liquid only flows through module 3. When two or three modules need to be cooled at the same time, the cooling of different modules can also be realized by controlling the conduction of the motor valve. Thus, the cooling control of the modules is realized.

[0049] By separately controlling the heating or cooling of different modules, the temperature of different positions of the battery pack can be better controlled. If the temperature of different positions of the battery pack is higher than 25℃ or lower than 25℃, the cooling and heating can be turned on respectively to meet the constant temperature state of the battery pack. Thus, the accuracy of the temperature control of the whole battery pack is ensured, and the temperature control effect is improved.

[0050] Figure 3 is a principle schematic diagram of the temperature control circuit provided in the embodiment. Figure 4 is Figure 3 a circuit principle diagram of the starting module in Figure 5 is Figure 3 a partial circuit principle diagram of the temperature detection module in Figure 6 is Figure 3 a partial circuit principle diagram of the control module in

[0051] As shown in Figure 3 , the temperature control circuit in the embodiment includes a starting module 1, a temperature detection module 2 and a control module 3; the starting module 1 and the temperature detection module 2 are connected with the control module 3; the starting module 1 is used for controlling the start or stop of the temperature control circuit, the temperature detection module 2 is used for detecting the temperature of each module, and the control module 3 is used for adjusting the temperature of the module. Each starting module 1, temperature detection module 2 and control module 3 can be a group, which controls the temperature of the corresponding module, as shown in Figure 3 , three groups are listed for illustration, and one of them is described in detail in the subsequent embodiment, which can be understood by mutual reference.

[0052] Specifically, the main role of the starting module 1 is to start or stop the operation of the whole circuit, and the temperature detection module 2 detects the current temperature of the corresponding module after the circuit is started, and the control module 3 controls the corresponding heater or cooler to work according to the current temperature, so as to adjust the temperature of the module to the target value.

[0053] As shown in Figure 4 , the battery pack constant temperature system does not work all the time. When the main positive relay and the main negative relay are closed at the same time, that is, the input pin1 and pin2 of U14A are high level at the same time, pin3 outputs high level, pin3 of triode Q0 is high level, triode Q0 is turned on, and the battery pack constant temperature system is started. When connecting slow charging gun or fast charging gun, pin1 or pin2 of U15A inputs high level, pin3 of triode Q0 is high level, triode Q0 is turned on, and the battery pack constant temperature system is started. When the main positive relay and the main negative relay are disconnected, and the AC gun and the DC gun are not connected, pin1 and pin2 of U16A input low level, pin3 outputs low level, pin3 of triode Q0 is low level, triode Q0 is not turned on, and the battery pack constant temperature system is closed. The voltage stabilizing chip SSP7903 outputs stable 5V voltage to provide power supply for the comparator, and the battery pack constant temperature systems of the three modules are controlled and worked separately, without interference with each other, and judge whether the temperature of each module meets the constant temperature 25℃. Therefore, the starting module 1 determines whether to start heating or cooling or keep constant temperature according to the connection state of the main positive relay, the main negative relay, the AC gun and the DC gun.

[0054] As shown in Figure 5 , the temperature detection module 2 in the embodiment includes: a temperature sensor and a third comparator; the temperature sensor RT is connected with the input end of the third comparator U3, and the output end of the third comparator U3 is connected with the control module 3.

[0055] Specifically, the number of temperature sensors is consistent with the number of modules, that is, three temperature sensors RT are arranged in the three modules, so as to monitor the temperature of the corresponding module respectively, and further control the temperature of the module better. Meanwhile, the third comparator U3 is also included, and the function of the comparator is to compare the difference between the current temperature collected by the temperature sensor and the target document, and then control the corresponding heating switch or the cooler valve to open, so as to realize temperature regulation.

[0056] Among them, Figure 5 is a schematic diagram of the principle of the temperature sensor and the third comparator corresponding to a module, and Figure 3 , it can be known that the circuit structure of the temperature detection module 2 of other modules is the same, so it will not be illustrated one by one.

[0057] Further, as shown in Figure 3As shown, the control module 3 comprises control components corresponding to the number of modules, each of which comprises a comparison unit and a switching unit; the comparison unit is connected to the temperature detection module 2, and the switching unit is also connected to the comparison unit; the comparison unit is used to compare the current temperature of the module with the target temperature, and the switching unit is used to control the working state of the heater or the refrigerator based on the result of the comparison unit. Wherein, the comparison unit comprises a first comparison loop and a second comparison loop; the first comparison loop and the second comparison loop are connected to the temperature detection module 2, and the first comparison loop is also connected to the second comparison loop; the first comparison loop is used to control the conduction or disconnection of the corresponding heater, and the second comparison loop is used to control the conduction or disconnection of the corresponding refrigerator.

[0058] Specifically, the first comparison loop comprises a first comparator U1, a first triode Q1 and a second triode Q2; the second comparison loop comprises a second comparator U2, a third triode Q3 and a fourth triode Q4; the base of the first triode Q1 is connected to the temperature detection module 2, the emitter of the first triode Q1 is connected to the power module, the collector of the first triode Q1 is connected to the emitter of the second triode Q2, the base of the second triode Q2 is connected to the temperature detection module 2, and the collector of the second triode Q2 is grounded; the base of the third triode Q3 is connected to the temperature detection module 2, the emitter of the third triode Q3 is connected to the power module, the collector of the third triode Q3 is connected to the emitter of the fourth triode Q4, the base of the fourth triode Q4 is connected to the temperature detection module 2, and the collector of the fourth triode Q4 is grounded; the input terminals of the first comparator U1 are respectively connected to the temperature detection module 2 and the emitter of the first triode Q1, and the output terminal of the first comparator U1 is connected to the switching unit; the input terminals of the second comparator U2 are respectively connected to the temperature detection module 2 and the emitter of the third triode Q3, and the output terminal of the second comparator U2 is connected to the switching unit.

[0059] The first comparison loop further comprises a first capacitor C1, and the second comparison loop further comprises a second capacitor C2; one end of the first capacitor C1 is connected to the emitter of the first triode Q1, and the other end is grounded; one end of the second capacitor C2 is connected to the emitter of the third triode Q3, and the other end is grounded.

[0060] As Figure 6As shown, the switching unit further includes a heating switch controller and a refrigerator valve controller; the heating switch controller is connected to a first comparison circuit, and the refrigerator valve controller is connected to a second comparison circuit; the heating switch controller is used to control the heating switch to be turned on or off, and the refrigerator valve controller is used to control the refrigerator valve to be turned on or off. The heating switch controller includes a fifth transistor Q5 and a sixth transistor Q6, and the refrigerator valve controller includes a seventh transistor Q7, an eighth transistor Q8, and a ninth transistor Q9. The base of the fifth transistor Q5 is connected to the second comparator circuit, the emitter of the fifth transistor Q5 is connected to the first comparator circuit, the collector of the fifth transistor Q5 is connected to the base of the sixth transistor Q6, the emitter of the sixth transistor Q6 is connected to the power supply module, and the collector of the sixth transistor Q6 is connected to the heating switch. The base of the seventh transistor Q7 is connected to the first comparator circuit, the emitter of the seventh transistor Q7 is connected to the second comparator circuit, the collector of the seventh transistor Q7 is connected to the bases of both the eighth transistor Q8 and the ninth transistor Q9, the emitters of both the eighth transistor Q8 and the ninth transistor Q9 are connected to the power supply module, the collector of the eighth transistor Q8 is connected to the water inlet valve of the refrigerator valve, and the collector of the ninth transistor Q9 is connected to the water outlet valve of the refrigerator valve.

[0061] Therefore, the heater switch S1 and the cooler valves MV1 and MV2 can be controlled by the control module 3.

[0062] like Figures 1-6 As shown, taking the example of module 1's temperature first falling below 25℃ and then rising above 25℃, the entire circuit control process is explained as follows:

[0063] RT is a thermistor, in Figure 3In the whole circuit, since there are three modules, it can be marked as RT1, RT2 and RT3 for convenience of description, therefore, RT1 is located in module 1, and measures the temperature of module 1, when the temperature of module 1 is 25℃, the resistance value of RT1 is 10KΩ, the lower the temperature of module 1, the greater the resistance value of the thermistor, the higher the temperature of module 1, the lower the resistance value of the thermistor, when the temperature of module 1 is lower than 25℃, the resistance value of RT1 is greater than 10K, the input voltage of pin2 of the third comparator U3 is greater than 2.5V, the output of pin3 of the third comparator is high level, the first transistor Q1 is turned on, after the inverter U1A, pin2 of the second transistor Q2 is not turned on, since the first transistor Q1 is turned on, the voltage stabilizing chip SSP7903 charges the first capacitor C1 through the resistor R4, when the voltage of C1 is lower than 4V, the input voltage of pin2 of the first comparator U1 is lower than the input voltage of pin1, therefore, the output of pin3 of the first comparator U1 is low level. When the voltage of C1 reaches 4V, the input voltage of pin2 of the first comparator U1 is higher than the input voltage of pin1, therefore, the output of pin3 of the first comparator U1 is high level, after the inverter U2A, the third transistor Q3 is not turned on, and cannot charge the second capacitor C2, the input voltage of pin2 of the second comparator U2 is lower than the input voltage of pin1, therefore, the output of pin3 of the second comparator U2 is low level, after the inverter U4A, the output is high level, the fifth transistor Q5 is turned on, and the sixth transistor Q6 is turned on, driving the heating relay S1 to be closed, and the heating film PTC1 starts to work, and heats module 1.

[0064] When the temperature of the module 1 is higher than 25℃, the resistance value of the RT1 is less than 10K, the pin3 input voltage of the third comparator U3 is less than 2.5V, the pin3 output of the third comparator U3 is low, the first triode Q1 is not conductive, the pin2 of the second triode Q2 is conductive through the inverter U1A, the first capacitor C1 discharges through the resistance R7, and the first capacitor C1 discharges through the resistance R7, when the voltage of C1 is lower than 4V, the pin2 input voltage of the first comparator U1 is lower than the pin1 input voltage, and thus the pin3 output of the first comparator U1 is low, the sixth triode Q6 is not conductive, the heating relay drive of the PTC1 is disconnected, and the heating film PTC1 stops working, and the heating process is pushed out. The seventh triode Q7 is conductive through the comparator U3A output high level, the seventh triode Q7 is conductive, the pin3 output of the first comparator U1 is low when the temperature of the module 1 is higher than 25℃, the pin3 of the second triode Q2 is not conductive, the third triode Q3 is conductive through the inverter U2A output high level, the voltage of C2 is lower than 4V, the pin2 input voltage of the second comparator U2 is lower than the pin1 input voltage, and thus the pin3 output of the second comparator U2 is low. When the voltage of C2 reaches 4V, the pin2 input voltage of the second comparator U2 is higher than the pin1 input voltage, and thus the pin3 output of the first comparator U1 is high. Since the seventh triode Q7 is conductive at this time, the eighth triode Q8 and the ninth triode Q9 are conductive, and thus the refrigeration valve MV1 and MV2 are driven to be conductive, and the cooling liquid can flow through the module 1. At this time, the cooling system of the module 1 is started, and the module 1 is cooled.

[0065] When the temperature is lower than 25℃ again, the cooling is stopped, and whether the heating opening condition is met again is judged.

[0066] The first capacitor C1 and the second C2 are used to delay the driving of the PTC1 heating relay S1 or the refrigeration valve MV1, MV2, so as to prevent the heating and cooling system in the module 1 from being frequently switched. According to the capacitor charging formula T=RC*ln((V1-V0) / (V1-Vt)), V0 is the initial voltage value (0V) on the capacitor, V1 is the final voltage (5V) that the capacitor can be charged to, Vt is the voltage value (4V) on the capacitor at t time, C=37.5mF, R=10KΩ, and T=10min can be obtained by bringing the formula. That is, when the PTC1 heating relay S1 or the refrigeration valve MV1, MV2 is driven, the heating or cooling function will be started only when the heating or cooling condition is met for 10min.

[0067] The fifth transistor Q5, the seventh transistor Q7 and the inverters U3A, U4A are used to prevent the heating relay S1 and the cooler valve MV1, MV2 in the module 1 from working at the same time, thereby preventing the heating system and the cooling system from working at the same time.

[0068] It should be noted that, as Figure 3 described above, the process of detecting and controlling the corresponding heating switch and cooler valve by other temperature sensors is the same as the control mode of the above embodiment, and therefore will not be described one by one. Since there are three modules in this embodiment, there are 27 working conditions for temperature control of the modules, and the constant temperature means that the temperature of the module is controlled to be constant in a certain range, which is as follows:

[0069] Working condition 1: module 1 cooling, module 2 constant temperature, module 3 constant temperature

[0070] Working condition 2: module 1 cooling, module 2 heating, module 3 constant temperature

[0071] Working condition 3: module 1 cooling, module 2 cooling, module 3 constant temperature

[0072] Working condition 4: module 1 cooling, module 2 constant temperature, module 3 heating

[0073] Working condition 5: module 1 cooling, module 2 heating, module 3 heating

[0074] Working condition 6: module 1 cooling, module 2 cooling, module 3 heating

[0075] Working condition 7: module 1 cooling, module 2 constant temperature, module 3 cooling

[0076] Working condition 8: module 1 cooling, module 2 heating, module 3 cooling

[0077] Working condition 9: module 1 cooling, module 2 cooling, module 3 cooling

[0078] Working condition 10: module 1 heating, module 2 constant temperature, module 3 constant temperature

[0079] Working condition 11: module 1 heating, module 2 heating, module 3 constant temperature

[0080] Working condition 12: module 1 heating, module 2 cooling, module 3 constant temperature

[0081] Working condition 13: module 1 heating, module 2 constant temperature, module 3 heating

[0082] Working condition 14: module 1 heating, module 2 heating, module 3 heating

[0083] Working condition 15: module 1 heating, module 2 cooling, module 3 heating

[0084] Condition 16: Module 1 heating, module 2 constant temperature, module 3 cooling

[0085] Condition 17: Module 1 heating, module 2 heating, module 3 cooling

[0086] Condition 18: Module 1 heating, module 2 cooling, module 3 cooling

[0087] Condition 19: Module 1 constant temperature, module 2 constant temperature, module 3 constant temperature

[0088] Condition 20: Module 1 constant temperature, module 2 heating, module 3 constant temperature

[0089] Condition 21: Module 1 constant temperature, module 2 cooling, module 3 constant temperature

[0090] Condition 22: Module 1 constant temperature, module 2 constant temperature, module 3 heating

[0091] Condition 23: Module 1 constant temperature, module 2 heating, module 3 heating

[0092] Condition 24: Module 1 constant temperature, module 2 cooling, module 3 heating

[0093] Condition 25: Module 1 constant temperature, module 2 constant temperature, module 3 cooling

[0094] Condition 26: Module 1 constant temperature, module 2 heating, module 3 cooling

[0095] Condition 27: Module 1 constant temperature, module 2 cooling, module 3 cooling

[0096] By grouping the battery pack according to the module, the heat management of the battery pack is divided into several parts according to the module, one module one heat management, according to the temperature of the module to start or close the heat management, three module battery pack constant temperature system is controlled separately, works independently, and does not interfere with each other, and judges whether the temperature of the respective module meets the constant temperature 25℃. Moreover, the same module adds a mutual exclusion circuit, and the same module can only be in one state and cannot be in multiple states at the same time. Different modules of the same battery pack can be in heating or cooling state respectively. When the same module changes from heating to cooling or from cooling to heating, there is a 10-minute delay in the middle, and it will not switch immediately. It needs to meet the cooling condition or heating condition for 10 minutes continuously to switch the heat management mode, reducing the energy loss caused by frequent mode switching.

[0097] The device embodiments described above are merely illustrative, wherein the units described as separate components can or can not be physically separate, and the components displayed as units can or can not be physical units, i.e., can be located in one place, or can be distributed to multiple network units. Part or all of the modules can be selected to achieve the purposes of the embodiments according to actual needs. Those skilled in the art can understand and implement without creative labor.

[0098] Through the description of the above embodiments, those skilled in the art can clearly understand that the embodiments can be realized by means of software and the necessary general hardware platform, and of course can also be realized by hardware. Based on such understanding, the above technical solutions can be embodied in the form of a software product, which can be stored in a computer readable storage medium, such as a ROM / RAM, a magnetic disk, an optical disk, etc., and includes a plurality of instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute the methods described in each embodiment or some parts of the embodiments.

[0099] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A temperature regulation system for a battery pack, characterized in that, The battery pack includes multiple modules, and the temperature regulation system includes: a heating component, a cooling component, and a temperature control circuit. The heating assembly includes heaters corresponding to the number of modules, and the cooling assembly includes coolers corresponding to the number of modules; The heater and the cooler are respectively configured in one-to-one correspondence with the module, and both the heater and the cooler are connected to the temperature control circuit; the temperature control circuit is used to heat the corresponding module through the heater, and also to cool the module corresponding to the cooler; The battery pack has three modules. The heater is a PTC heater, and the cooler is a water chiller with pump circulation. The PTC is divided into three independent heating systems according to the modules, which are controlled by heating relays. Depending on the module temperature, the three PTCs can be turned on individually or simultaneously. When the charging gun is not plugged in, if the heating requirement is met, the PTC is powered by the battery pack. When the charging gun is plugged in, if the heating requirement is met, the charging pile powers the PTC. The temperature control circuit includes a startup module, a temperature detection module, and a control module; the startup module and the temperature detection module are both connected to the control module; the startup module is used to control the startup or shutdown of the temperature control circuit, the temperature detection module is used to detect the temperature of each module, and the control module is used to adjust the temperature of the module. The control module includes control components corresponding to the number of modules. Each control component includes a comparison unit and a switching unit. The comparison unit is connected to the temperature detection module, and the switching unit is also connected to the comparison unit. The comparison unit is used to compare the current temperature of the module with the target temperature, and the switching unit is used to control the working state of the heater or cooler based on the result of the comparison unit.

2. The temperature regulation system for the battery pack according to claim 1, characterized in that, Each heater is equipped with a heating switch, and each cooler is equipped with a cooler valve.

3. The temperature regulation system for the battery pack according to claim 1, characterized in that, The comparison unit includes: a first comparison circuit and a second comparison circuit; Both the first comparison circuit and the second comparison circuit are connected to the temperature detection module, and the first comparison circuit is also connected to the second comparison circuit; The first comparison circuit is used to control the on or off of the corresponding heater, and the second comparison circuit is used to control the on or off of the corresponding cooler.

4. The temperature regulation system for the battery pack according to claim 3, characterized in that, The first comparison circuit includes: a first comparator, a first transistor, and a second transistor; each of the second comparison circuits includes: a second comparator, a third transistor, and a fourth transistor. The base of the first transistor is connected to the temperature detection module, the emitter of the first transistor is connected to the power supply module, the collector of the first transistor is connected to the emitter of the second transistor, the base of the second transistor is connected to the temperature detection module, and the collector of the second transistor is grounded. The base of the third transistor is connected to the temperature detection module, the emitter of the third transistor is connected to the power supply module, the collector of the third transistor is connected to the emitter of the fourth transistor, the base of the fourth transistor is connected to the temperature detection module, and the collector of the fourth transistor is grounded. The input terminal of the first comparator is connected to the temperature detection module and the emitter of the first transistor, respectively, and the output terminal of the first comparator is connected to the switching unit. The input terminal of the second comparator is connected to the temperature detection module and the emitter of the third transistor, respectively, and the output terminal of the second comparator is connected to the switching unit.

5. The temperature regulation system for the battery pack according to claim 4, characterized in that, The first comparison circuit further includes a first capacitor; the second comparison circuit further includes a second capacitor. One end of the first capacitor is connected to the emitter of the first transistor, and the other end is grounded; one end of the second capacitor is connected to the emitter of the third transistor, and the other end is grounded.

6. The temperature regulation system for the battery pack according to claim 3, characterized in that, The switching unit includes: a heating switch controller and a cooler valve controller; The heating switch controller is connected to the first comparison circuit, and the cooler valve controller is connected to the second comparison circuit; The heating switch controller is used to control the heating switch to be turned on or off, and the refrigerator valve controller is used to control the refrigerator valve to be turned on or off.

7. The temperature regulation system for the battery pack according to claim 6, characterized in that, The heating switch controller includes a fifth transistor and a sixth transistor, and the cooler valve controller includes a seventh transistor, an eighth transistor, and a ninth transistor; The base of the fifth transistor is connected to the second comparator circuit, the emitter of the fifth transistor is connected to the first comparator circuit, the collector of the fifth transistor is connected to the base of the sixth transistor, the emitter of the sixth transistor is connected to the power supply module, and the collector of the sixth transistor is connected to the heating switch. The base of the seventh transistor is connected to the first comparator circuit, the emitter of the seventh transistor is connected to the second comparator circuit, the collector of the seventh transistor is connected to the base of the eighth transistor and the ninth transistor respectively, the emitters of the eighth transistor and the ninth transistor are both connected to the power supply module, the collector of the eighth transistor is connected to the water inlet valve of the refrigerator valve, and the collector of the ninth transistor is connected to the water outlet valve of the refrigerator valve.

8. The temperature regulation system for the battery pack according to claim 1, characterized in that, The temperature detection module includes: a temperature sensor and a third comparator; The temperature sensor is connected to the input terminal of the third comparator, and the output terminal of the third comparator is connected to the control module.

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