Temperature control cell circuit and battery management system

Abstract

The utility model provides a temperature control cell circuit and a battery management system, and belongs to the technical field of battery safety, the temperature control cell circuit comprises a temperature acquisition module, a temperature comparison module, a control module and a switch module; the output end of the temperature acquisition module is connected with the input end of the temperature comparison module, the output end of the temperature comparison module is connected with the control module, the control module is further connected with the switch module, and the switch module is connected with the refrigerator and the heater; the temperature acquisition module is used for acquiring the temperature value of the battery cell, the temperature comparison module is used for outputting a temperature comparison signal, the control module is used for outputting a switching signal according to the temperature comparison signal, and the switching module switches on the heater or the refrigerator according to the switching signal; the refrigerator and the heater in the battery pack are controlled through the circuit so as to adjust the temperature of the battery cell, so that the temperature of the battery cell can be controlled within a target range more quickly and effectively, and the temperature control efficiency of the battery cell is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery safety, and in particular to a temperature-controlled battery circuit and a battery management system. Background Art

[0002] With the continuous improvement of science and technology, in various fields such as automobiles, energy storage, and communications, multiple battery cells are usually connected in series to form a high-voltage power supply unit to obtain sufficient power energy. Since the whole vehicle needs to operate in various harsh environments, the safe operation of the whole vehicle is particularly important. Therefore, the performance requirements for the battery cells are very strict, and their performance is greatly affected by temperature. Especially under low or high temperature conditions, the state of the battery cells is prone to abnormality, resulting in the inability to supply power normally. Therefore, the temperature of the battery cells needs to be guaranteed to be within the range of normal, stable and efficient operation. At present, the commonly used battery cell temperature control method is liquid cooling, which is achieved by laying a liquid cooling plate around the battery cell and passing coolant into the liquid cooling plate to dissipate the heat of the battery cell.

[0003] However, when the battery is subjected to external forces, the coolant is prone to leak into the battery, causing safety issues such as battery short circuit, combustion or explosion. In addition, the temperature of the battery cell cannot be quickly controlled and adjusted by cooling with coolant, and it is difficult to ensure that the battery cell remains within the temperature range where it can work stably and efficiently. Utility Model Content

[0004] The utility model provides a temperature-controlled battery cell circuit and a battery management system, which are used to solve the defect of low battery cell temperature control efficiency in the prior art.

[0005] On the one hand, the utility model provides a temperature control battery circuit, including: a temperature acquisition module, a temperature comparison module, a control module and a switch module;

[0006] The output end of the temperature acquisition module is connected to the input end of the temperature comparison module, the output end of the temperature comparison module is connected to the control module, the control module is also connected to the switch module, and the switch module is connected to the refrigerator and the heater;

[0007] The temperature acquisition module is used to acquire the temperature value of the battery cell, the temperature comparison module is used to output a temperature comparison signal, the control module is used to output a switch signal according to the temperature comparison signal, and the switch module turns on the heater or the refrigerator according to the switch signal.

[0008] According to a temperature-controlled battery cell circuit provided by the utility model, the switch module includes: a drive switch and a temperature-controlled switch;

[0009] The input end of the driving switch is connected to the control module, the output end of the driving switch is connected to the temperature control switch, and the temperature control switch is also connected to the heater and the refrigerator;

[0010] The driving switch is used to drive the temperature control switch to be turned on or off, and the temperature control switch is used to switch the on state and the off state of the heater or the refrigerator.

[0011] According to a temperature-controlled battery cell circuit provided by the utility model, the driving switch includes: a high-side driving and a low-side driving;

[0012] The input end of the high-side driver and the input end of the low-side driver are both connected to the control module, and the output end of the high-side driver and the output end of the low-side driver are both connected to the temperature control switch;

[0013] The high-side driver and the low-side driver are used to turn on or off the temperature control switch.

[0014] According to a temperature-controlled battery circuit provided by the utility model, the temperature-controlled switch includes: a heater switch and a refrigerator switch;

[0015] The heater switch is respectively connected to the high-side driver and the low-side driver, and is used to turn on or off the heater;

[0016] The refrigerator switch is connected to the high-side driver and the low-side driver respectively, and is used to turn on or off the refrigerator.

[0017] According to a temperature-controlled battery cell circuit provided by the utility model, the switch module further includes: a protection component;

[0018] One end of the protection component is connected between the drive switch and the temperature control switch, and the other end of the protection component is connected to the control module;

[0019] The protection component is used for performing pressure division and current limiting protection on the heater and the refrigerator.

[0020] According to a temperature-controlled battery cell circuit provided by the utility model, the temperature comparison module includes: a high temperature comparison component and a low temperature comparison component;

[0021] The input end of the high temperature comparison component and the input end of the low temperature comparison component are both connected to the temperature acquisition module, and the output end of the high temperature comparison component and the output end of the low temperature comparison component are both connected to the control module;

[0022] The high temperature comparison component is used to compare the temperature value with the high temperature threshold and output a high temperature level signal, and the low temperature comparison component is used to compare the temperature value with the low temperature threshold and output a low temperature level signal.

[0023] According to a temperature control battery circuit provided by the utility model, the temperature acquisition module includes: a temperature sensor, a first voltage-dividing resistor, a second voltage-dividing resistor, a first filter capacitor and a second filter capacitor;

[0024] One end of the first filter capacitor, one end of the temperature sensor and one end of the second filter capacitor are all grounded;

[0025] The other end of the first filter capacitor and one end of the first voltage-dividing resistor are both connected to a high level;

[0026] The other end of the temperature sensor and the other end of the first voltage-dividing resistor are both connected to one end of the second voltage-dividing resistor;

[0027] The other end of the second voltage-dividing resistor and the other end of the second filter capacitor are both connected to the temperature comparison module.

[0028] According to a temperature-controlled battery cell circuit provided by the utility model, the temperature acquisition module further includes: a current-limiting resistor;

[0029] One end of the current limiting resistor is connected to the other end of the second voltage-dividing resistor and the other end of the second filter capacitor respectively, and the other end of the current limiting resistor is connected to the temperature comparison module.

[0030] According to a temperature control battery cell circuit provided by the utility model, it also includes: a power module;

[0031] The power module is connected to the control module;

[0032] The power module is used to supply power to the temperature control battery circuit.

[0033] The utility model also protects a battery management system, comprising the temperature control battery cell circuit as described in any one of the above items.

[0034] The utility model provides a temperature-controlled battery cell circuit and a battery management system, wherein the temperature-controlled battery cell circuit comprises: a temperature acquisition module, a temperature comparison module, a control module and a switch module; the output end of the temperature acquisition module is connected to the input end of the temperature comparison module, the output end of the temperature comparison module is connected to the control module, the control module is also connected to the switch module, and the switch module is connected to the refrigerator and the heater; the temperature acquisition module is used to acquire the temperature value of the battery cell, the temperature comparison module is used to output a temperature comparison signal, the control module is used to output a switch signal according to the temperature comparison signal, the switch module turns on the heater or the refrigerator according to the switch signal, controls the refrigerator and the heater inside the battery pack by means of a circuit, and thus adjusts the temperature of the battery cell, which can more quickly and effectively control the battery cell temperature within a target range, and effectively improves the battery cell temperature control efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0036] Figure 1 It is a structural schematic diagram of a temperature control battery cell circuit provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0038] Figure 1 It is a structural schematic diagram of a temperature control battery cell circuit provided by an embodiment of the utility model.

[0039] like Figure 1 As shown, a temperature control cell circuit provided in this embodiment includes: a temperature acquisition module 1, a temperature comparison module 2, a control module 3 and a switch module 4; the output end of the temperature acquisition module 1 is connected to the input end of the temperature comparison module 2, the output end of the temperature comparison module 2 is connected to the control module 3, the control module 3 is also connected to the switch module 4, and the switch module 4 is connected to the refrigerator and the heater; the temperature acquisition module 1 is used to collect the temperature value of the cell, the temperature comparison module 2 is used to output a temperature comparison signal, the control module 3 is used to output a switch signal according to the temperature comparison signal, and the switch module 4 turns on the heater or the refrigerator according to the switch signal. The control module 3 usually uses a controller.

[0040] In a specific implementation process, the main function of the controller is to control the on or off of the switch module 4 according to the level signal output by the comparison module, so the control module 3 can use a microcontroller (Microcontroller Unit, MCU). The main function of the temperature comparison module 2 is to compare the relationship between the temperature value and the preset target value, so as to determine whether the current temperature is within the target temperature range. The temperature acquisition module 1 is mainly used to collect the real-time temperature of the battery cell.

[0041] The specific workflow is that first, the temperature control cell circuit replaces the original liquid cooling heat dissipation, so as not to reach the battery pack, wherein the temperature acquisition module 1 is close to or in contact with the cell to collect the real-time temperature value of the cell. After the temperature acquisition module 1 collects the real-time temperature value of the cell, the temperature value is transmitted to the temperature comparison module 2. The temperature comparison module 2 compares the temperature drop value with the target value. There can be two target values, a high temperature target value and a low temperature target value, that is, two boundary values ​​of the normal temperature range. Through temperature comparison, it is determined whether the current cell temperature value is within the normal temperature range. If it is within the normal temperature range, no temperature adjustment is required. At this time, the controller does not respond after receiving the signal. If it is found that the temperature value of the cell is not within the normal temperature range after comparison, it indicates that the current cell temperature value is abnormal and the cell temperature value needs to be adjusted. At this time, the controller will output a switch signal to the switch module 4, and turn on the corresponding refrigerator or heater by turning on the switch module 4 to adjust the cell temperature. Thereby, the temperature of the cell is adjusted to within the normal temperature range, and then the controller is restored to a state where no switch signal is output. By collecting the battery cell temperature value in real time and adjusting the battery cell temperature in real time, it can be better ensured that the battery cell temperature is within the normal temperature range, thereby improving the working condition of the battery cell.

[0042] Compared with the existing liquid cooling method, the temperature of the battery cell is regulated by the circuit. It effectively avoids the refrigerant flowing into the battery and causing damage to the battery. It can not only cool the battery cell, but also heat the battery cell, effectively improving the efficiency of regulating the battery cell temperature and better ensuring battery safety. Moreover, after the circuit is integrated into the semiconductor circuit board, it is more convenient to install.

[0043] Further, based on the above embodiment, Figure 1 As shown, the switch module 4 in this embodiment includes: a driving switch and a temperature control switch; the input end of the driving switch is connected to the control module 3, the output end of the driving switch is connected to the temperature control switch, and the temperature control switch is also connected to the heater and the refrigerator; the driving switch is used to drive the temperature control switch to be turned on or off, and the temperature control switch is used to switch the on state and the off state of the heater or the refrigerator.

[0044] Specifically, the drive switch and the temperature control switch cooperate with each other to jointly realize the control of the heater and the refrigerator, wherein the heater and the refrigerator are the battery management system itself. Therefore, for the temperature-controlled battery cell circuit, the circuit is more concise, the temperature control switch is connected to the heater and the refrigerator respectively, and the drive switch is connected to the temperature control switch. The control process is that when the drive switch receives the cooling signal of the controller, the drive switch drives the refrigerator switch 42 in the temperature control switch to turn on, thereby controlling the refrigerator to turn on and cool the battery cell. When the drive switch receives the heating signal of the controller, the drive switch drives the heater switch 41 in the temperature control switch to turn on, thereby controlling the heater to turn on and heat the battery cell. Thereby, the heating or cooling of the battery cell is effectively and quickly achieved.

[0045] Further, based on the above embodiment, Figure 1 As shown, the driving switch in this embodiment includes: a high-side driver HSD and a low-side driver LSD; the input end of the high-side driver HSD and the input end of the low-side driver LSD are both connected to the control module 3, and the output end of the high-side driver HSD and the output end of the low-side driver LSD are both connected to the temperature control switch; the high-side driver HSD and the low-side driver LSD are used to turn on or off the temperature control switch. The temperature control switch includes: a heater switch 41 and a refrigerator switch 42; the heater switch 41 is respectively connected to the high-side driver HSD and the low-side driver LSD, and is used to turn on or off the heater; the refrigerator switch 42 is respectively connected to the high-side driver HSD and the low-side driver LSD, and is used to turn on or off the refrigerator.

[0046] Specifically, the heater switch 41 and the refrigerator switch 42 are controlled by the high-side drive HSD and the low-side drive LSD. The two ends of the heater switch 41 are connected to the high-side drive HSD and the low-side drive LSD, respectively. Similarly, the two ends of the refrigerator switch 42 are also connected to the high-side drive HSD and the low-side drive LSD. When a cooling signal is received, the high-side drive HSD and the low-side drive LSD work, driving the refrigerator switch 42 to turn on, so that the refrigerator starts cooling and reduces the battery core temperature to within the normal temperature range; when a heating signal is received, the high-side drive HSD and the low-side drive LSD work, driving the heater switch 41 to turn on, so that the heater starts heating and heats the battery core temperature to within the normal temperature range. In this way, the rapid adjustment of the battery core temperature is achieved quickly, and the temperature adjustment efficiency is effectively guaranteed.

[0047] Further, based on the above embodiment, Figure 1 As shown, the switch module 4 in this embodiment also includes: a protection component; one end of the protection component is connected between the drive switch and the temperature control switch, and the other end of the protection component is connected to the control module 3; the protection component is used to perform voltage division and current limiting protection on the heater and the refrigerator.

[0048] Specifically, the protection component includes a voltage-dividing resistor and a current-limiting resistor, which are mainly used to protect the heater switch 41 and the refrigerator switch 42 to prevent the heater or the refrigerator from overvoltage or overcurrent. The circuit between the high-side driver HSD and the heater switch 41 and the refrigerator switch 42, as well as the circuit between the low-side driver LSD and the heater switch 41 and the refrigerator switch 42, are connected with a protection component composed of a voltage-dividing resistor Rf and a current-limiting resistor Rx, which can more comprehensively protect the heater switch 41 and the refrigerator switch 42 as well as the refrigerator and the heater, and better ensure the safety and reliability of the circuit.

[0049] Further, based on the above embodiment, Figure 1 As shown, the temperature comparison module 2 includes: a high temperature comparison component 21 and a low temperature comparison component 22; the input end of the high temperature comparison component 21 and the input end of the low temperature comparison component 22 are both connected to the temperature acquisition module 1, and the output end of the high temperature comparison component 21 and the output end of the low temperature comparison component 22 are both connected to the control module 3; the high temperature comparison component 21 is used to compare the temperature value with the high temperature threshold and output a high temperature level signal, and the low temperature comparison component 22 is used to compare the temperature value with the low temperature threshold and output a low temperature level signal.

[0050] Specifically, both the high temperature comparison component 21 and the low temperature comparison component 22 use operational amplifiers to compare temperature values. The high temperature comparison component 21 mainly compares the temperature value with the high temperature threshold to determine whether the current temperature value of the battery cell is too high through the output level; the low temperature comparison component 22 mainly compares the temperature value with the low temperature threshold to determine whether the current temperature value of the battery cell is too low through the output level. The current comparison result can be judged by outputting high and low levels. The high temperature comparison component 21 and the low temperature comparison component 22 work simultaneously, thereby better ensuring the timeliness and effectiveness of the judgment of the battery cell temperature. (5V) means that the operating voltage is 5V.

[0051] Further, based on the above embodiment, Figure 1As shown, the temperature acquisition module 1 in this embodiment includes: a current limiting resistor R3, a temperature sensor NTC, a first voltage dividing resistor R1, a second voltage dividing resistor R2, a first filter capacitor C1 and a second filter capacitor C2; one end of the first filter capacitor C1, one end of the temperature sensor NTC and one end of the second filter capacitor C2 are all grounded; the other end of the first filter capacitor C1 and one end of the first voltage dividing resistor R1 are both connected to a high level; the other end of the temperature sensor NTC and the other end of the first voltage dividing resistor R1 are both connected to one end of the second voltage dividing resistor R2; the other end of the second voltage dividing resistor R2 and the other end of the second filter capacitor C2 are both connected to the temperature comparison module 2. One end of the current limiting resistor R3 is respectively connected to the other end of the second voltage dividing resistor R2 and the other end of the second filter capacitor C2, and the other end of the current limiting resistor R3 is connected to the temperature comparison module 2.

[0052] Specifically, the temperature sensor NTC is used to collect the real-time temperature value of the battery cell. The function of the first filter capacitor C1 and the second filter capacitor C2 is to maintain the accuracy of the temperature acquisition signal. The first voltage divider resistor R1 and the second voltage divider resistor R2 are to ensure the voltage safety of the temperature sensor, and the current limiting resistor R3 is to ensure that the current flowing into the temperature comparison module 2 is within a reasonable range, thereby ensuring the working safety of the temperature comparison module 2.

[0053] Further, based on the above embodiment, Figure 1 As shown, this embodiment also includes a power module 5; the power module 5 is connected to the control module 3; the power module 5 is used to supply power to the temperature control battery circuit.

[0054] Specifically, the power module 5 supplies 12V voltage to the controller, which can better ensure the power supply of the temperature control battery circuit, and the diode can also protect the circuit.

[0055] Furthermore, the temperature-controlled cell circuit is integrated on a semiconductor circuit board and then installed in the battery pack, which can effectively increase the rate of cooling or heating of the cell, thereby keeping the cell within a temperature range where it can work efficiently. At the same time, it can also effectively avoid safety issues such as battery short circuit, combustion or explosion caused by coolant leaking into the cell, thus ensuring the reliability of the vehicle during driving. Avoiding the use of coolant in the whole package and using semiconductor circuit boards makes the whole package assembly simpler and safer. In addition, compared with coolant, the working life cycle is increased by dozens of times and the cost is greatly reduced.

[0056] Based on the same general concept, the utility model also protects a battery management system, including the temperature control battery cell circuit of any of the above embodiments.

[0057] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Those of ordinary skill in the art may understand and implement it without creative effort.

[0058] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A temperature-controlled battery cell circuit, characterized in that: include: Temperature acquisition module, temperature comparison module, control module and switch module; The output end of the temperature acquisition module is connected to the input end of the temperature comparison module, the output end of the temperature comparison module is connected to the control module, the control module is also connected to the switch module, and the switch module is connected to the refrigerator and the heater; The temperature acquisition module is used to acquire the temperature value of the battery cell, the temperature comparison module is used to output a temperature comparison signal, the control module is used to output a switch signal according to the temperature comparison signal, and the switch module turns on the heater or the refrigerator according to the switch signal.

2. The temperature control battery circuit according to claim 1, characterized in that: The switch module includes: a drive switch and a temperature control switch; The input end of the driving switch is connected to the control module, the output end of the driving switch is connected to the temperature control switch, and the temperature control switch is also connected to the heater and the refrigerator; The driving switch is used to drive the temperature control switch to be turned on or off, and the temperature control switch is used to switch the on state and the off state of the heater or the refrigerator.

3. The temperature control cell circuit according to claim 2, characterized in that: The driving switch includes: a high-side driver and a low-side driver; The input end of the high-side driver and the input end of the low-side driver are both connected to the control module, and the output end of the high-side driver and the output end of the low-side driver are both connected to the temperature control switch; The high-side driver and the low-side driver are used to turn on or off the temperature control switch.

4. The temperature-controlled battery cell circuit according to claim 3, characterized in that: The temperature control switch includes: a heater switch and a refrigerator switch; The heater switch is respectively connected to the high-side driver and the low-side driver, and is used to turn on or off the heater; The refrigerator switch is connected to the high-side driver and the low-side driver respectively, and is used to turn on or off the refrigerator.

5. The temperature control cell circuit according to claim 2, characterized in that: The switch module further includes: a protection component; One end of the protection component is connected between the drive switch and the temperature control switch, and the other end of the protection component is connected to the control module; The protection component is used for performing pressure division and current limiting protection on the heater and the refrigerator.

6. The temperature-controlled battery cell circuit according to claim 1, characterized in that: The temperature comparison module includes: a high temperature comparison component and a low temperature comparison component; The input end of the high temperature comparison component and the input end of the low temperature comparison component are both connected to the temperature acquisition module, and the output end of the high temperature comparison component and the output end of the low temperature comparison component are both connected to the control module; The high temperature comparison component is used to compare the temperature value with the high temperature threshold and output a high temperature level signal, and the low temperature comparison component is used to compare the temperature value with the low temperature threshold and output a low temperature level signal.

7. The temperature-controlled battery cell circuit according to claim 1, characterized in that: The temperature acquisition module includes: a temperature sensor, a first voltage-dividing resistor, a second voltage-dividing resistor, a first filter capacitor and a second filter capacitor; One end of the first filter capacitor, one end of the temperature sensor and one end of the second filter capacitor are all grounded; The other end of the first filter capacitor and one end of the first voltage-dividing resistor are both connected to a high level; The other end of the temperature sensor and the other end of the first voltage-dividing resistor are both connected to one end of the second voltage-dividing resistor; The other end of the second voltage-dividing resistor and the other end of the second filter capacitor are both connected to the temperature comparison module.

8. The temperature-controlled battery cell circuit according to claim 7, characterized in that: The temperature acquisition module also includes: a current limiting resistor; One end of the current limiting resistor is connected to the other end of the second voltage-dividing resistor and the other end of the second filter capacitor respectively, and the other end of the current limiting resistor is connected to the temperature comparison module.

9. The temperature-controlled battery cell circuit according to any one of claims 1 to 8, characterized in that: Also includes: Power module; The power module is connected to the control module; The power module is used to supply power to the temperature control battery circuit.

10. A battery management system, characterized in that: Comprising a temperature-controlled battery cell circuit as described in any one of claims 1 to 9.

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