Battery heating pack protection circuit

Abstract

The utility model relates to a battery heating pack protection circuit. The battery heating pack protection circuit comprises a main control module, an input module and a heating module, the input module comprises a temperature relay, and the temperature relay is electrically connected with the main control module; the heating module comprises a heating sheet J7, and the heating sheet J7 is electrically connected with the main control module. According to the scheme provided by the invention, the heating loop can be cut off, so that the problem of thermal runaway caused by over-temperature of the battery pack is prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery pack technical field especially relates to a battery heating package protection circuit. BACKGROUND

[0002] In the related art, the circuit for battery pack heating protection usually uses a thermistor for overcurrent protection, or adopts hardware control MOS tube to close. UTILITY MODEL CONTENTS

[0003] The utility model discloses a battery heating package protection circuit can cut off the heating loop to prevent the battery package from the thermal runaway problem caused by overtemperature.

[0004] The utility model discloses a battery heating package protection circuit can cut off the heating loop to prevent the battery package from the thermal runaway problem caused by overtemperature.

[0005] The utility model discloses a battery heating package protection circuit, including: main control module, input module includes temperature relay U9028, temperature relay U9028 with main control module electricity is connected, heating module includes heating piece J7, heating piece J7 with main control module electricity is connected.

[0006] The input module further includes fuse F900 and fuse F9002, the first end of fuse F900 is connected with temperature relay U9028 and the first end of fuse F9002 electricity respectively, the second end of fuse F9002 is connected with the second end of fuse F900 electricity.

[0007] The main control module includes MOS tube Q9004 and MOS tube Q9000, MOS tube Q9004 and MOS tube Q9000 are connected with the second end of fuse F900 electricity respectively, MOS tube Q9004 is connected with MOS tube Q9000 electricity, and heating piece J7 is connected with MOS tube Q9004 and MOS tube Q9000 electricity respectively.

[0008] The master control module further includes a capacitor C9053, a resistor R9022 and a diode ZD9903, the first end of the capacitor C9053 is electrically connected with the MOS tube Q9004 and the MOS tube Q9000 respectively, the second end of the capacitor C9053 is electrically connected with the first end of the resistor R9022, the second end of the resistor R9022 is electrically connected with the MOS tube Q9004 and the MOS tube Q9000 respectively, the first end of the diode ZD9903 is electrically connected with the first end of the resistor R9022, and the second end of the diode ZD9903 is electrically connected with the MOS tube Q9004 and the MOS tube Q9000 respectively.

[0009] The master control module further includes an optoelectronic coupler U9024, a resistor R9023 and a resistor R9021, the first end of the resistor R9023 is electrically connected with the first end of the diode ZD9903, the second end of the resistor R9023 is electrically connected with the optoelectronic coupler U9024, and the resistor R9021 is electrically connected with the optoelectronic coupler U9024.

[0010] The master control module further includes a resistor R9020, a resistor R9019 and a MOS tube U9023, the first end of the resistor R9020 is electrically connected with the MOS tube U9023, the first end of the resistor R9019 is electrically connected with the MOS tube U9023, the second end of the resistor R9019 is grounded, and the MOS tube U9023 is electrically connected with the optoelectronic coupler U9024.

[0011] The master control module further includes a temperature control interface, and the temperature control interface is electrically connected with the second end of the resistor R9020.

[0012] Further include a detection module, the detection module includes a Hall sensor U9027, the first end of the Hall sensor U9027 is electrically connected with the MOS tube Q9004 and the MOS tube Q9000 respectively, and the second end of the Hall sensor U9027 is electrically connected with the heating piece J7.

[0013] The detection module further includes a resistor R9024 and a capacitor C9039, the resistor R9024 is electrically connected with the Hall sensor U9027, the first end of the capacitor C9039 is electrically connected with the Hall sensor U9027, and the second end of the capacitor C9039 is grounded.

[0014] The detection module further includes a capacitor C9004, and the capacitor C9004 is electrically connected with the Hall sensor U9027.

[0015] Compared with the prior art, the utility model has at least the following advantages:

[0016] By setting the temperature relay, when the heating piece temperature is too high to cause the battery pack to overheat, the whole circuit can be cut off in time, thereby preventing the battery pack from overheating and causing thermal runaway. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows.

[0018] Figure 1 The functional module diagram of the battery heating pack protection circuit in an embodiment of the present application is shown in the figure.

[0019] Figure 2 The circuit diagram of the battery heating pack protection circuit in an embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0020] The embodiments of the present application will be described in detail with reference to the accompanying drawings. Although the embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0021] It should be understood that although the terms "first", "second", "third" and the like can be used to describe various information in the present application, these information should not be limited by these terms. These terms are only used to distinguish the same type of information from each other. For example, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as the first information without departing from the scope of the present application. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0022] Unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixed connection, or detachable connection or integral; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0023] The circuit for battery pack heating protection usually uses a thermistor for overcurrent protection or adopts a hardware-controlled MOS tube to be closed. However, the above-mentioned mode cannot really disconnect the whole heating loop when the battery pack is overheated, so that the battery pack can be out of thermal runaway, resulting in a safety accident.

[0024] To solve the above-mentioned problems, the embodiment of the present application provides a battery heating pack protection circuit which can cut off the heating loop, thereby preventing the battery pack from thermal runaway caused by overheating.

[0025] The technical scheme of the embodiment of the present application is described in detail below with reference to the drawings.

[0026] Please refer to Figure 1 and Figure 2 A battery heating pack protection circuit, comprising: a main control module 100, an input module 200 and a heating module 300, the input module 200 comprises a temperature relay U9028, the temperature relay U9028 is electrically connected with the main control module 100; the heating module 300 comprises a heating sheet J7, the heating sheet J7 is electrically connected with the main control module 100.

[0027] It should be noted that the heating sheet J7 is used for heating the battery pack, and further, the temperature relay U9028 is arranged in the present application, so that when the heating sheet is overheated and the battery pack is overheated, the whole loop can be cut off in time, thereby preventing the battery pack from thermal runaway caused by overheating.

[0028] Please refer to Figure 2 In an embodiment, the input module 200 further comprises a fuse F900 and a fuse F9002, the first end of the fuse F900 is electrically connected with the temperature relay U9028 and the first end of the fuse F9002 respectively, and the second end of the fuse F9002 is electrically connected with the second end of the fuse F900.

[0029] It should be noted that the fuse F900 and the fuse F9002 can play the role of overload protection. Specifically, the temperature of the fuse gradually rises under the long-term effect of overload current, and finally reaches the melting point to be fused, thereby cutting off the circuit and preventing damage to the circuit caused by long-term overload.

[0030] Please refer to Figure 2 In an embodiment, the main control module 100 comprises a MOS tube Q9004 and a MOS tube Q9000, the MOS tube Q9004 and the MOS tube Q9000 are electrically connected with the second end of the fuse F900 respectively, the MOS tube Q9004 is electrically connected with the MOS tube Q9000, and the heating sheet J7 is electrically connected with the MOS tube Q9004 and the MOS tube Q9000 respectively.

[0031] It should be noted that the MOS tube Q9004 and the MOS tube Q9000 play the role of switch.

[0032] Please refer to Figure 2 In an embodiment, the master module 100 further comprises a capacitor C9053, a resistor R9022 and a diode ZD9903, the first end of the capacitor C9053 is electrically connected with the MOS tube Q9004 and the MOS tube Q9000 respectively, the second end of the capacitor C9053 is electrically connected with the first end of the resistor R9022, the second end of the resistor R9022 is electrically connected with the MOS tube Q9004 and the MOS tube Q9000 respectively, the first end of the diode ZD9903 is electrically connected with the first end of the resistor R9022, and the second end of the diode ZD9903 is electrically connected with the MOS tube Q9004 and the MOS tube Q9000 respectively.

[0033] It should be noted that the capacitor C9053 plays the role of filtering, the diode ZD9903 is used for protecting the circuit, and the resistor R9022 is a current limiting resistor.

[0034] Please refer to Figure 2 In an embodiment, the master module 100 further comprises an opto-coupler U9024, a resistor R9023 and a resistor R9021, the first end of the resistor R9023 is electrically connected with the first end of the diode ZD9903, the second end of the resistor R9023 is electrically connected with the opto-coupler U9024, and the resistor R9021 is electrically connected with the opto-coupler U9024.

[0035] Specifically, the master module 100 further comprises a resistor R9020, a resistor R9019 and a MOS tube U9023, the first end of the resistor R9020 is electrically connected with the MOS tube U9023, the first end of the resistor R9019 is electrically connected with the MOS tube U9023, the second end of the resistor R9019 is grounded, and the MOS tube U9023 is electrically connected with the opto-coupler U9024.

[0036] It should be noted that the combination of the opto-coupler U9024 and the MOS tube U9023 can isolate strong electricity and weak electricity, avoid the interference and damage of strong electricity to weak electricity control circuit, and improve the stability and reliability of the circuit. In addition, the output signal power of the opto-coupler U9024 is usually small, which is difficult to directly drive the MOS tube U9023, especially when driving a high-power MOS tube U9023. By combining the two, the output signal of the opto-coupler U9024 can be used as the driving signal of the MOS tube U9023, and by using the amplification function of the MOS tube U9023, the small power signal can be converted into a large power signal capable of driving the load.

[0037] Please refer to Figure 2In an embodiment, the main control module 100 further comprises a temperature control interface, which is electrically connected with the second end of the resistor R9020.

[0038] It should be noted that the temperature control interface is TEMP_CTR, which can be externally connected with a temperature controller including but not limited to a temperature controller to control the heating of the heating sheet J7 by the heating circuit.

[0039] Please refer to Figure 2 In an embodiment, the battery heating pack protection circuit further comprises a detection module, which comprises a Hall sensor U9027, the first end of the Hall sensor U9027 is electrically connected with the MOS tube Q9004 and the MOS tube Q9000 respectively, and the second end of the Hall sensor U9027 is electrically connected with the heating sheet J7. Specifically, the detection module further comprises a resistor R9024 and a capacitor C9039, the resistor R9024 is electrically connected with the Hall sensor U9027, the first end of the capacitor C9039 is electrically connected with the Hall sensor U9027, and the second end of the capacitor C9039 is grounded. Specifically, the detection module further comprises a capacitor C9004, which is electrically connected with the Hall sensor U9027.

[0040] It should be noted that the Hall sensor U9027 functions to detect current to monitor the size of the current in real time and functions as overcurrent protection. Further, the resistor R9024 is a current limiting resistor, and the capacitor C9039 is a filter capacitor.

[0041] The circuit principle of the present application is described as follows:

[0042] The external power supply VCC_HEAT+ is electrically connected, passes through the temperature relay U9028, the fuse F9000 and the fuse F9002, and the temperature controller drives the MOS tube Q9004 and the MOS tube Q9000 to be turned on through the temperature control interface, so as to heat the heating sheet J7, thereby achieving the heating of the battery pack.

[0043] The scheme of the present application has been described in detail above with reference to the drawings. In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments. It should also be known by those skilled in the art that the actions and modules involved in the specification are not necessarily required by the present application. In addition, it can be understood that the steps in the method of the embodiments of the present application can be adjusted, combined and reduced in sequence according to actual needs, and the modules in the device of the embodiments of the present application can be combined, divided and reduced according to actual needs.

[0044] Having described various embodiments of the application, it is to be understood that the above description is meant not to limit and not to encompass all of the possible embodiments. Many modifications and variations of this application can be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. It is intended that the scope of the application be defined by the scope of the patent and by the claims as allowed by the patent office, which can include adaptations based on the description, equivalents, and / or substitutions of elements individually or collectively to the entire disclosure.

Claims

1. A battery heating pack protection circuit, characterized by, It includes: A master module; An input module including a temperature relay, which is electrically connected with the master module; A heating module including a heating sheet J7, which is electrically connected with the master module.

2. The battery pack protection circuit according to claim 1, wherein The input module further includes a fuse F900 and a fuse F9002, the first end of the fuse F900 is respectively electrically connected with the temperature relay and the first end of the fuse F9002, the second end of the fuse F9002 is electrically connected with the second end of the fuse F900.

3. The battery pack protection circuit of claim 2, wherein, The master module includes MOS tube Q9004 and MOS tube Q9000, which are respectively electrically connected with the second end of the fuse F900, the MOS tube Q9004 is electrically connected with the MOS tube Q9000, and the heating sheet J7 is respectively electrically connected with the MOS tube Q9004 and the MOS tube Q9000.

4. The battery pack protection circuit of claim 3, wherein, The master module further includes a capacitor C9053, a resistor R9022 and a diode ZD9903, the first end of the capacitor C9053 is respectively electrically connected with the MOS tube Q9004 and the MOS tube Q9000, the second end of the capacitor C9053 is electrically connected with the first end of the resistor R9022, the second end of the resistor R9022 is respectively electrically connected with the MOS tube Q9004 and the MOS tube Q9000, the first end of the diode ZD9903 is electrically connected with the first end of the resistor R9022, and the second end of the diode ZD9903 is respectively electrically connected with the MOS tube Q9004 and the MOS tube Q9000.

5. The battery pack protection circuit of claim 4, wherein, The master module further includes an optoelectronic coupler, a resistor R9023 and a resistor R9021, the first end of the resistor R9023 is electrically connected with the first end of the diode ZD9903, the second end of the resistor R9023 is electrically connected with the optoelectronic coupler, and the resistor R9021 is electrically connected with the optoelectronic coupler.

6. The battery pack protection circuit of claim 5, wherein, The master module further includes a resistor R9020, a resistor R9019 and a MOS tube U9023, the first end of the resistor R9020 is electrically connected with the MOS tube U9023, the first end of the resistor R9019 is electrically connected with the MOS tube U9023, the second end of the resistor R9019 is grounded, and the MOS tube U9023 is electrically connected with the optoelectronic coupler.

7. The battery pack protection circuit of claim 6, wherein, The master module further includes a temperature control interface, which is electrically connected with the second end of the resistor R9020.

8. The battery pack protection circuit according to claim 3 or 2, characterized by, It further includes a detection module, which includes a Hall sensor, the first end of the Hall sensor is respectively electrically connected with the MOS tube Q9004 and the MOS tube Q9000, and the second end of the Hall sensor is electrically connected with the heating sheet J7.

9. The battery pack protection circuit of claim 8, wherein, The detection module further includes a resistor R9024 and a capacitor C9039, the resistor R9024 is electrically connected with the Hall sensor, and the first end of the capacitor C9039 is electrically connected with the Hall sensor, and the second end of the capacitor C9039 is grounded.

10. The battery pack protection circuit according to claim 8 or 9, characterized in that, The detection module further includes a capacitor C9004, which is electrically connected with the Hall sensor.

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