Heating film assembly and battery pack temperature control system

Abstract

The utility model discloses a heating film assembly and a battery pack temperature control system, which comprise a heating film body, a thermistor and a relay assembly, the heating film body is provided with a connecting point, the connecting point is conductively connected with a power harness, the power harness is used for electrically connecting a battery pack, the thermistor is attached to the heating film body, and the relay assembly is connected with the thermistor. The relay assembly is electrically connected with the thermistor, the control end of the relay assembly is used for being electrically connected with a BMS system of the battery pack, and the controlled end of the relay assembly is electrically connected with the power wire harness. The thermistor is used for temperature detection, the thermistor is attached to the surface of the heating film body, temperature detection can be effectively and accurately carried out, the relay assembly is electrically connected with the thermistor, the power wire harness can be timely disconnected under the over-temperature condition, heating is stopped, and the safety and reliability of a system can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy, and in particular to a heating film component and a battery pack temperature control system. Background Art

[0002] Low-temperature performance needs to be considered in the design of battery systems for new energy vehicles. Related technologies usually install a heating film block on the battery pack and weld a temperature switch on the wiring harness at the output end of the heating film block to achieve over-temperature disconnection. However, the temperature switch has a high failure rate, inaccurate temperature detection, and untimely disconnection, which seriously affects the safety and reliability of the battery system. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a heating film assembly and a battery pack temperature control system that can more accurately detect temperature and promptly disconnect the over-temperature device.

[0004] In one aspect, an embodiment of the present invention provides a heating film assembly suitable for heating a battery pack, comprising:

[0005] The heating film body is provided with a connection point, the connection point is conductively connected to a power harness, and the power harness is used to electrically connect to the battery pack;

[0006] a thermistor mounted on the heating film body;

[0007] A relay assembly is electrically connected to the thermistor, a control end of the relay assembly is used to electrically connect to the BMS system of the battery pack, and a controlled end of the relay assembly is electrically connected to the power harness.

[0008] According to some embodiments of the present invention, the thermistor is an NTC resistor, and the NTC resistor is connected in series with the relay assembly.

[0009] According to some embodiments of the present invention, the thermistor is a water drop head resistor, and the water drop head resistor is mounted on the outer wall of the heating film body.

[0010] According to some embodiments of the present invention, the heating film body includes a heating element and an insulating film, and the heating element is wrapped in the insulating film.

[0011] According to some embodiments of the present invention, the heating element is made of a SUS conductor.

[0012] According to some embodiments of the present invention, an adhesive layer is provided on the outer surface of the heating film body.

[0013] According to some embodiments of the present invention, a silicone film covering the connection points is provided on the heating film body.

[0014] According to some embodiments of the present invention, a plug is connected to the end of the power harness, and the plug is used to be plugged into the battery pack.

[0015] On the other hand, an embodiment of the present invention provides a battery pack temperature control system, including a BMS system and the above-mentioned heating film assembly, wherein the BMS system is electrically connected to the control end of the relay assembly of the heating film assembly.

[0016] On the other hand, an embodiment of the present invention provides a battery pack temperature control system, including a battery pack and the above-mentioned heating film assembly, the battery pack is provided with a BMS system, the BMS system is electrically connected to the control end of the relay assembly of the heating film assembly, and the battery pack is electrically connected to the power harness of the heating film assembly.

[0017] The embodiments of the present invention have at least the following beneficial effects:

[0018] Using a thermistor for temperature detection and mounting the thermistor on the surface of the heating film body can effectively and accurately detect temperature. The relay component is electrically connected to the thermistor, and the power harness can be disconnected in time in the event of overtemperature, thereby stopping heating, which is beneficial to improving the safety and reliability of the system.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 This is a schematic structural diagram of a heating film assembly according to an embodiment of the present invention;

[0022] Figure 2 This is a circuit principle block diagram of the battery pack temperature control system according to an embodiment of the present invention.

[0023] Reference numerals:

[0024] Heating film body 100 , connection point 101 , power harness 102 , heating element 110 , insulating film 120 , thermistor 200 , relay assembly 300 , battery pack 400 , BMS system 500 , chip processor 510 . DETAILED DESCRIPTION

[0025] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0026] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0027] In the description of this utility model, "several" means one or more, "multiple" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, and "above," "below," and "within" are understood to include the number itself. The use of terms such as "first" and "second" is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, or implicitly indicating the number or order of the technical features indicated.

[0028] In the description of the present invention, unless otherwise clearly defined, words such as “setting”, “installation”, and “connection” should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above words in the present invention based on the specific content of the technical solution.

[0029] Please refer to Figure 1 and Figure 2This embodiment discloses a heating film assembly suitable for heating a battery pack 400. The heating film assembly includes a heating film body 100, a thermistor 200 and a relay assembly 300. The heating film body 100 is provided with a connection point 101. The connection point 101 is conductively connected to a power harness 102. The power harness 102 is used to electrically connect the battery pack 400. For example, the connection point 101 is a soldering pad, and the power harness 102 is welded on the soldering pad. For example, the connection point 101 is a plug terminal, and the power harness 102 is plugged into the plug terminal. The thermistor 200 is mounted on the heating film body 100 and can well detect the surface temperature of the heating film body 100. The relay assembly 300 is electrically connected to the thermistor 200. The control end of the relay assembly 300 is used to electrically connect to the BMS system 500 (BMS, full name Battery Management System) of the battery pack 400. The controlled end of the relay assembly 300 is electrically connected to the power harness 102. For example, the connection end of the coil of the relay assembly 300 is used as the control end (such as Figure 2 As shown by the mark A), the normally open contact and the normally closed contact of the relay assembly 300 are used as the controlled end (such as Figure 2 As shown by the mark B), the thermistor 200 is connected in series with the coil of the relay assembly 300, and is electrically connected to the chip processor 510 of the BMS system 500, so as to control the action of the relay assembly 300 according to the temperature change detected by the thermistor 200, realize the on-off control of the power harness 102, and further control the start or shut down of the heating film body 100.

[0030] This embodiment uses a thermistor 200 for temperature detection and mounts the thermistor 200 on the surface of the heating film body 100, which can effectively and accurately detect temperature. It is electrically connected to the thermistor 200 through the relay assembly 300. In the event of overtemperature, the power harness 102 can be disconnected in time to stop heating, which is beneficial to improving the safety and reliability of the system.

[0031] Thermistor 200 utilizes an NTC resistor (negative temperature coefficient resistor), connected in series with relay assembly 300. The advantages of NTC resistors include high sensitivity, excellent stability, compact size, fast response speed, and suitability for a wide range of electronic devices. The high sensitivity and small size are due to the negative temperature coefficient of NTC resistors, which means their resistance changes rapidly with temperature. This allows them to detect even small temperature changes and maintain high sensitivity. Furthermore, NTC resistors are typically very small, making them easy to integrate into various devices and simplifying installation and use. The excellent stability of NTC thermistor 200 means it maintains stability even in high-temperature environments, ensuring its reliability and consistency over long-term use. The fast response speed is due to the high temperature sensitivity of NTC resistors, which allows them to quickly respond to temperature changes. This makes them suitable for temperature control systems that require fast response times.

[0032] The thermistor 200 uses a water droplet resistor, which is mounted on the outer wall of the heating film body 100. The advantages of the water droplet resistor include high precision, fast response, good stability, high reliability, high sensitivity, fast response, compact structure, easy installation, high insulation resistance, strong interchangeability, and high precision.

[0033] As an NTC resistor, the water drop resistor has significant advantages:

[0034] ‌High precision and fast response: The water drop head resistor is produced with new materials and new processes, with the advantages of high precision and fast response. It can provide accurate temperature measurement results and has a short response time, which is suitable for application scenarios that require fast response.

[0035] ‌Good stability and high reliability‌: The water drop head resistor has good stability and can maintain performance consistency over a long period of time, ensuring measurement accuracy and reliability.

[0036] High sensitivity and fast response: The water dropper resistor has high sensitivity and can detect tiny temperature changes. It also responds quickly, making it suitable for applications that require rapid detection of temperature changes.

[0037] ‌Small structure and easy installation‌: The water drop head resistor is designed with a small size and compact structure, which is easy to install and arrange, and is suitable for application scenarios with limited space.

[0038] ‌High Insulation Resistance‌: The insulation resistance of the drip head resistor exceeds 100MΩ, which has good electrical safety.

[0039] ‌Strong interchangeability and high precision‌: The water drop head resistor provides products with different R and B values, which are highly interchangeable and can ensure high-precision measurement.

[0040] Please refer to Figure 1 The heating element 100 includes a heating element 110 and an insulating film 120. The heating element 110 is enclosed within the insulating film 120, which insulates and protects the heating element 110 from electrical leakage. The heating element 110 is made of SUS (Steel Used in Special Applications, a Japanese stainless steel material) conductor, which has a good heat generation rate and helps improve heating efficiency.

[0041] The outer surface of the heating film body 100 is provided with an adhesive layer, which is used to bond with the battery pack 400. The heating film body 100 is bonded to the battery pack 400 through the adhesive layer, wherein the adhesive layer can be realized by double-sided tape, or the adhesive layer can be realized by gluing.

[0042] The heating film body 100 is provided with a silicone film covering the connection point 101. The silicone film can provide insulation protection for the connection point 101 and improve the safety of use. In addition, the silicone film can also provide waterproof and dustproof protection for the connection point 101 and improve the reliability of the connection.

[0043] The end of the power harness 102 is connected to a plug, which is used to connect to the battery pack 400. The power harness 102 includes a positive harness and a negative harness, both of which are connected to the plug, wherein the relay assembly 300 is connected to the negative harness.

[0044] Please refer to Figure 2 This embodiment provides a battery pack temperature control system, including a BMS system 500 and the aforementioned heating film assembly. The BMS system 500 is electrically connected to the control terminal of the relay assembly 300 of the heating film assembly. The BMS system 500 is external to the battery pack 400 and is used to manage the power supply of the battery pack 400. The heating film assembly detects the temperature of the battery pack 400 via thermistor 200 and transmits the temperature detection signal to the BMS system 500. If the battery temperature is too high, the BMS system 500 controls the relay to promptly disconnect the power harness 102, thereby cutting off the power supply to the battery pack 400.

[0045] This embodiment uses a thermistor 200 for temperature detection and mounts the thermistor 200 on the surface of the heating film body 100, which can effectively and accurately detect temperature. It is electrically connected to the thermistor 200 through the relay assembly 300. In the event of overtemperature, the power harness 102 can be disconnected in time to stop heating, which is beneficial to improving the safety and reliability of the system.

[0046] Please refer to Figure 2This embodiment provides a battery pack temperature control system, including a battery pack 400 and the aforementioned heating film assembly. The battery pack 400 is provided with a BMS system 500. The BMS system 500 is electrically connected to the control terminal of the relay assembly 300 of the heating film assembly, and the battery pack 400 is electrically connected to the power harness 102 of the heating film assembly. The battery pack 400 is integrated with the BMS system 500, which is used to manage the power supply of the battery pack 400. The heating film assembly detects the temperature of the battery pack 400 via thermistor 200 and transmits the temperature detection signal to the BMS system 500. If the battery temperature is too high, the BMS system 500 controls the relay to promptly disconnect the power harness 102, thereby cutting off the power supply to the battery pack 400.

[0047] This embodiment uses a thermistor 200 for temperature detection and mounts the thermistor 200 on the surface of the heating film body 100, which can effectively and accurately detect temperature. It is electrically connected to the thermistor 200 through the relay assembly 300. In the event of overtemperature, the power harness 102 can be disconnected in time to stop heating, which is beneficial to improving the safety and reliability of the system.

[0048] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A heating film assembly suitable for heating a battery pack (400), characterized in that: include: The heating film body (100) is provided with a connection point (101), the connection point (101) is conductively connected to a power supply harness (102), and the power supply harness (102) is used to electrically connect to the battery pack (400); a thermistor (200) mounted on the heating film body (100); A relay component (300) is electrically connected to the thermistor (200), a control end of the relay component (300) is used to electrically connect to the BMS system (500) of the battery pack (400), and a controlled end of the relay component (300) is electrically connected to the power harness (102).

2. The heating film assembly according to claim 1, characterized in that: The thermistor (200) is an NTC resistor, and the NTC resistor is connected in series with the relay component (300).

3. The heating film assembly according to claim 1 or 2, characterized in that: The thermistor (200) is a water drop resistor, and the water drop resistor is mounted on the outer wall of the heating film body (100).

4. The heating film assembly according to claim 1, characterized in that The heating film body (100) comprises a heating element (110) and an insulating film (120), wherein the heating element (110) is wrapped in the insulating film (120).

5. The heating film assembly according to claim 4, characterized in that: The heating element (110) adopts a SUS conductor.

6. The heating film assembly according to claim 1, 4 or 5, characterized in that: The outer surface of the heating film body (100) is provided with an adhesive layer.

7. The heating film assembly according to claim 1, 4 or 5, characterized in that: The heating film body (100) is provided with a silicone film covering the connection point (101).

8. The heating film assembly according to claim 1, characterized in that: The end of the power harness (102) is connected to a plug, and the plug is used to be plugged into the battery pack (400).

9. A battery pack temperature control system, characterized in that: It comprises a BMS system (500) and a heating film assembly according to any one of claims 1 to 8, wherein the BMS system (500) is electrically connected to a control end of a relay assembly (300) of the heating film assembly.

10. A battery pack temperature control system, characterized in that: The invention comprises a battery pack (400) and a heating film assembly according to any one of claims 1 to 8, wherein the battery pack (400) is provided with a BMS system (500), the BMS system (500) is electrically connected to a control end of a relay assembly (300) of the heating film assembly, and the battery pack (400) is electrically connected to a power harness (102) of the heating film assembly.

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