Battery temperature control NTC circuit structure

Abstract

The utility model relates to the field of temperature control, and discloses a battery temperature control NTC (Negative Temperature Coefficient) circuit structure, which comprises an NTC control circuit arranged on an integrated circuit board of an electronic product, and a temperature sensor connecting point close to the positive electrode of a battery is led out from the NTC control circuit; the temperature sensor is connected with the temperature sensor connecting point, and the temperature sensor is connected with an NTC pole of the NTC control circuit through an insulating flexible wire; one surface of the battery positive plate is in contact with the battery positive electrode, and the other surface of the battery positive plate is exposed and has a contact area matched with the size of the temperature sensor; the exposed surface of the battery positive plate is coated with the heat-conducting glue, and a probe of the temperature sensor is attached to the exposed surface through the heat-conducting glue and is reinforced and stable through a peripheral assembly structure of the positive plate, or the probe and the battery positive plate are reinforced and stable in a mode that viscous foam or hot melt glue or quick-drying glue is adopted for pasting and then the periphery is filled with the heat-conducting glue.

Description

Technical Field

[0001] This utility model relates to the field of battery temperature control technology for electronic products, and in particular to a battery temperature control NTC circuit structure suitable for electronic products with replaceable ordinary single-cell batteries. Background Technology

[0002] In the field of electronic products, some countries and regions have put forward strict circuit protection requirements and certification standards for the safe operating temperature of electronic product batteries. That is, it is necessary to ensure that electronic products work normally within the safe operating temperature range of batteries, and automatically stop working and charging if the range is exceeded.

[0003] An NTC (Negativile Temperature Coefficient) thermistor is an electronic component widely used in temperature detection and control. Its resistance decreases exponentially with increasing temperature. In existing battery temperature control technologies, this characteristic of NTC thermistors is often utilized to construct control circuits. For example, in conventional battery protection circuit designs, an NTC thermistor is typically connected between the positive and negative terminals of the battery and linked to the control circuit. When the internal temperature of the battery rises, the resistance of the NTC thermistor decreases, leading to an increase in current in the circuit. This triggers protective measures, such as stopping battery charging or suspending electronic devices, to prevent battery damage or safety accidents due to overheating.

[0004] From a material composition perspective, NTC thermistors are typically made by mixing transition metal oxides (such as oxides of manganese, cobalt, and nickel) in specific proportions and then sintering them at high temperatures. The crystal structure and electronic properties of these metal oxides change with temperature, resulting in a change in resistance. The relationship between resistance and temperature can be approximated by the following formula:

[0005]

[0006] Where RT is the resistance value at the actual temperature T, R0 is the resistance value at the reference temperature T0; B is the material constant, the value of which depends on the material composition of the NTC thermistor; e is the natural constant, approximately equal to 2.71828.

[0007] In existing battery temperature control technologies, NTC thermistors are widely used. They are commonly used to build battery protection circuits, controlling the charging and discharging process by monitoring battery temperature to ensure safe battery use. In practical applications, NTC thermistors are usually combined with other electronic components (such as resistors, capacitors, and transistors) to form a circuit connected to the positive and negative terminals of the battery or other relevant circuit nodes. When the battery temperature changes, the resistance value of the NTC thermistor changes accordingly, causing changes in electrical parameters such as current and voltage in the circuit. These changes are captured by the detection circuit, and after appropriate signal processing and logic judgment, the battery status can be monitored and controlled. For example, when the battery temperature is too high, the circuit can trigger protective measures based on the change in the NTC thermistor, such as reducing the charging current, stopping charging, or stopping electronic products from operating, thereby preventing the battery from being damaged due to overheating and avoiding potential safety accidents such as battery bulging, burning, or even explosion.

[0008] However, as Figure 1 As shown, the traditional method of battery temperature control using NTC mainly involves integrating the NTC control circuit onto the integrated circuit board of the electronic product, and setting a temperature sensor (such as a thermistor) and circuitry within the battery's protection board. The protection board is tightly attached to the heat-generating area of ​​the battery body and encapsulated as a single unit. The positive and negative terminals of the protection board, along with the wires of the temperature sensor, are connected to the positive and negative terminals of the power output of the integrated circuit board of the electronic product and the NTC terminals. This method has significant drawbacks: batteries using this type of temperature control are usually placed inside the product, making it difficult for users to quickly remove or replace them; even if some electronic products use detachable connectors for battery removal, the operation is complex and the user experience is poor; for electronic products such as keyboards and mice that have long used removable ordinary single-cell batteries and whose battery compartment structures are designed according to the specifications of the single-cell batteries, it is impossible to use detachable connectors inside the battery compartment to implement temperature control circuit protection. If a non-removable battery is used, it contradicts the actual "openable battery compartment for battery replacement" form of the product, easily leading to the risk of sales that do not match the description. Utility Model Content

[0009] The purpose of this utility model is to provide a battery temperature control NTC circuit structure, which effectively solves the temperature control problem of removable single-cell battery electronic products, meets specific safe operating temperature requirements and certification requirements, while maintaining the original structural characteristics of the removable battery, improving user experience and avoiding sales risks.

[0010] This application provides a battery temperature control NTC circuit structure, including:

[0011] An NTC control circuit is installed on the integrated circuit board of an electronic product, and a temperature sensor connection point is led out from the NTC control circuit near the positive terminal of the battery.

[0012] A temperature sensor connected to the temperature sensor connection point, wherein the temperature sensor is connected to the NTC pole of the NTC control circuit via an insulated flexible wire;

[0013] A positive electrode plate for a battery, wherein one side of the positive electrode plate is in contact with the positive electrode of the battery, and the other side of the positive electrode plate is exposed and has a contact area adapted to the size of the temperature sensor;

[0014] The thermally conductive adhesive is applied to the exposed surface of the positive electrode of the battery. The probe of the temperature sensor is attached to the exposed surface through the thermally conductive adhesive and reinforced and stabilized by the outer assembly structure of the positive electrode. Alternatively, it can be reinforced and stabilized with the positive electrode by using any one of adhesive foam, hot melt adhesive, or quick-drying adhesive and then filling the surrounding area with thermally conductive adhesive.

[0015] Furthermore, the temperature sensor is a thermistor, which can quickly and sensitively detect the instantaneous temperature of the battery so that the NTC control circuit can make an accurate and timely safety control response. The probe of the temperature sensor is closely attached to the metal surface of the positive electrode of the battery. This metal surface is the other side of the convex structure stamped from a metal sheet with good conductivity and thermal conductivity. Alternatively, when the thermal conductivity structure of the negative electrode or other battery parts does not conform to the characteristics of the conventional positive electrode, the battery position with the best thermal conductivity structure is used as the contact point for the probe of the temperature sensor.

[0016] Compared with existing technologies, the battery temperature control NTC circuit structure provided above effectively solves the temperature control problem of removable single-cell battery electronic products, meets specific safe operating temperature requirements and certification requirements, while maintaining the original structural characteristics of the removable battery, improving user experience and avoiding sales risks. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the NTC circuit and assembly structure in the prior art;

[0018] Figure 2 This is a schematic diagram of the battery temperature control NTC circuit and assembly structure provided in this embodiment of the utility model;

[0019] Figure 3 This is a schematic diagram of the core components related to battery temperature control provided in this embodiment of the utility model;

[0020] Figure 4 This is a schematic diagram of the NTC control circuit layout and temperature sensor connection point location on the integrated circuit board of an electronic product provided in this embodiment of the utility model.

[0021] Figure 5 This is a schematic diagram of the key parts of the temperature sensor bonding and wire connection path provided in this embodiment of the utility model. Detailed Implementation

[0022] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0023] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0025] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0027] The implementation of this utility model will be described in detail below with reference to specific embodiments.

[0028] Reference Figure 1-5 A battery temperature control NTC circuit structure, comprising:

[0029] An NTC control circuit is installed on the integrated circuit board of an electronic product, and a temperature sensor connection point is led out from the NTC control circuit near the positive terminal of the battery.

[0030] A temperature sensor connected to the temperature sensor connection point, wherein the temperature sensor is connected to the NTC pole of the NTC control circuit via an insulated flexible wire;

[0031] A positive electrode plate for a battery, wherein one side of the positive electrode plate is in contact with the positive electrode of the battery, and the other side of the positive electrode plate is exposed and has a contact area adapted to the size of the temperature sensor;

[0032] The thermally conductive adhesive is applied to the exposed surface of the positive electrode of the battery. The probe of the temperature sensor is attached to the exposed surface through the thermally conductive adhesive and reinforced and stabilized by the outer assembly structure of the positive electrode. Alternatively, it can be reinforced and stabilized with the positive electrode by using adhesive foam, hot melt adhesive, quick-drying adhesive, etc., and then filling the surrounding area with thermally conductive adhesive.

[0033] Furthermore, the temperature sensor is a thermistor, which can quickly and sensitively detect the instantaneous temperature of the battery so that the NTC control circuit can make an accurate and timely safety control response. The probe of the temperature sensor is closely attached to the metal surface of the positive electrode of the battery. This metal surface is the other side of the convex structure stamped from a metal sheet with good conductivity and thermal conductivity. Alternatively, when the thermal conductivity structure of the negative electrode or other battery parts does not conform to the characteristics of the conventional positive electrode, the battery position with the best thermal conductivity structure is used as the contact point for the probe of the temperature sensor.

[0034] Circuit modification and connection point setting: Add (or adapt) an NTC control circuit to the integrated circuit board of the electronic product, and lead out the connection point (which can be a connector or solder joint) of the temperature sensor (such as a thermistor) from the circuit. The connection point should be located as close as possible to the positive terminal of the battery to facilitate subsequent production assembly operations, improve production efficiency and connection stability.

[0035] Temperature sensor selection and connection: Based on the actual operating conditions of the product and the characteristics of the battery, select a temperature sensor with a suitable shape and structure, such as a thermistor, which should have the ability to respond quickly to temperature changes. Use insulated flexible wires to reliably connect the temperature sensor to the NTC pole of the NTC control circuit to ensure the accuracy and stability of signal transmission and avoid temperature detection errors or signal interruptions caused by wire problems.

[0036] Battery positive electrode structure optimization: A detailed inspection and optimization adjustment were performed on the mounting structure of the battery positive electrode. Typically, in the electronics industry, it is customary for removable batteries to use a metal sheet with good conductivity, stamped into a raised shape, to facilitate contact with the battery's positive metal tip. Since metal-to-metal has good thermal conductivity, it is essential to ensure that the temperature sensor probe is tightly fitted to the metal surface of the battery positive electrode. Common electronic products with battery positive electrode structures usually have a slot (or clip) structure for mounting the positive electrode. In this invention, this slot structure can be fully utilized to securely mount the temperature sensor. Specifically, a temperature sensor with a matching temperature control probe is precisely selected based on the size and shape of the slot, and the space between the concave surface of the positive electrode and the slot wall. During installation, the temperature sensor probe is aligned and placed on the concave surface of the battery positive electrode, and then the entire positive electrode with the probe is inserted into the slot. If, due to limitations in the product's internal installation structure, insufficient contact area is exposed for the temperature sensor to adhere, then this part of the structure needs to be modified to ensure that the exposed area precisely matches the size of the temperature sensor. This guarantees that the temperature sensor can adhere tightly and securely to the positive electrode, achieving efficient heat conduction. The battery negative electrode is generally a two-in-one structure of a metal sheet welded to a conductive spring or contact spring, and its thermal conductivity is slightly lower than that of the positive electrode. If the actual design and structure of a particular product may not conform to the above, then the optimal location for the temperature sensor probe should be the battery position with the best thermal conductivity.

[0037] Temperature sensor mounting and thermal conductivity enhancement: Apply a thermally conductive adhesive (such as thermally conductive adhesive specifically for computer CPUs) evenly to the exposed surface of the treated battery positive electrode. Securely attach the temperature sensor probe to this surface, fully utilizing the excellent thermal conductivity between metals to enable the sensor to quickly and sensitively detect instantaneous temperature changes in the battery. Subsequently, reinforce the temperature sensor externally with adhesive foam or hot melt adhesive to prevent displacement or loosening during use; alternatively, initially attach the probe with quick-drying adhesive (such as 502 glue) to ensure accurate positioning, then fill the area around the probe with thermally conductive adhesive to further enhance thermal conductivity and mounting reliability.

[0038] Temperature control parameter debugging and optimization: After prototype assembly, considering the differences in internal structure of each electronic product, the variability of actual operating environment temperature, and the uncertainty of potential internal fault heat conduction paths, it is necessary to conduct in-depth calculations and analysis based on the NTC temperature control principle. Combined with actual test results, appropriate high and low temperature NTC control resistor values ​​are repeatedly debugged and selected. By simulating various extreme and normal operating conditions, it is ensured that the battery's operating temperature is always precisely controlled within a safe range under different operating conditions, fully meeting the safety operating temperature standards of the batteries used, thereby guaranteeing the stable operation of electronic products and the battery's lifespan.

[0039] Alternative applications for non-standard structure products: For special electronic products that do not have the traditional positive and negative electrode mounting structure of batteries, R&D personnel should fully understand and apply the core principles of this utility model. Based on the unique structural characteristics of the product and the battery mounting method, they should flexibly make innovative adjustments and optimizations to the installation position, fixing method and circuit connection method of the temperature sensor, so as to ensure that the battery temperature can be effectively monitored and controlled without changing the basic design architecture of the product, so that it can also meet the requirements of safe temperature control.

[0040] A specific implementation process is as follows:

[0041] 1. Integrated Circuit Board Processing: For common removable battery electronic products, the integrated circuit board is first evaluated. If an NTC control circuit is not present, it is carefully designed and added based on the product's electrical performance and temperature control requirements. If an NTC control circuit already exists, it is modified appropriately according to the temperature sensor's connection requirements to ensure that the temperature sensor connection point can be smoothly led out. Furthermore, this connection point should be positioned as close as possible to the battery's positive terminal in terms of spatial layout to facilitate subsequent wiring and installation, and to reduce wire length and signal interference.

[0042] 2. Temperature Sensor Preparation and Connection: Based on the product's internal space constraints, heat dissipation conditions, and battery heating characteristics, select a temperature sensor with high sensitivity, fast response speed, and good stability, such as a thermistor, and equip it with wires that have good insulation and flexibility. Connect one end of the temperature sensor to the temperature sensor connection point led out from the integrated circuit board using a reliable method such as soldering or a connector. Securely connect the other end to the NTC pole of the NTC control circuit, ensuring good electrical performance of the entire circuit connection and unobstructed signal transmission, laying the foundation for accurate temperature detection and control.

[0043] 3. Modification of battery positive electrode and fixation of temperature sensor: When installing the battery positive electrode, carefully check the exposed condition of the other side that is in contact with the battery positive electrode.

[0044] In common electronic products with battery positive electrode structures, a slot (or clip) structure is usually designed for mounting the battery positive electrode. In the implementation of this invention, this slot structure can be fully utilized to securely install a temperature sensor. Specifically, based on the size and shape of the slot, and the size of the space between the concave surface of the positive electrode and the slot wall, a temperature sensor with a suitable-sized temperature control probe is precisely selected. During installation, the temperature sensor probe is aligned and placed on the concave surface of the battery positive electrode, and then the entire positive electrode with the probe installed is inserted into the slot.

[0045] If a gap is found between the probe and the concave surface of the positive electrode during installation, the following optimization measures can be taken to ensure that the temperature sensor can stably and efficiently detect the battery temperature: First, place a sponge on the wall of the slot, using the elasticity and compressibility of the sponge to ensure that the probe fits tightly against the concave surface of the positive electrode; Second, first use a suitable adhesive (such as glue with good thermal conductivity) to bond the probe, positive electrode, and sponge into a whole, and then insert it into the slot. This method not only enhances the connection stability between the temperature sensor and the battery positive electrode, but also further improves heat conduction efficiency, ensuring that the temperature data acquired by the temperature sensor is accurate and reliable, providing precise temperature information to the NTC control circuit, thereby achieving effective monitoring and control of the battery temperature.

[0046] If the surface of the battery's positive electrode is not sufficiently exposed to accommodate the temperature sensor due to obstruction or improper design of internal structural components, then mechanical processing or structural optimization design methods should be used to appropriately cut, adjust, or redesign the relevant structural components. This ensures that the exposed area of ​​the positive electrode perfectly matches the size of the temperature sensor, guaranteeing a tight fit between the temperature sensor and the positive electrode for efficient heat conduction. A thin, even layer of thermally conductive adhesive is then applied to the prepared exposed surface. The temperature sensor probe is gently placed on top, ensuring full contact with the positive electrode. The appropriate reinforcement method is then selected based on the specific circumstances. If using adhesive foam or hot melt adhesive, it should be ensured to evenly cover the outside of the temperature sensor, providing sufficient fixing force. If using quick-drying adhesive to initially fix the probe, care should be taken to avoid excessive adhesive flowing between the probe and the positive electrode, affecting heat conduction. After the quick-drying adhesive has initially cured, thermally conductive adhesive should be carefully filled around the probe, ensuring that it fully fills the tiny gaps between the probe and the positive electrode, further improving heat conduction efficiency and fixing reliability.

[0047] 4. Temperature Control Parameter Adjustment: After completing the hardware assembly described above, the electronic product is assembled into a complete prototype. Considering the various complex environmental conditions and internal heat source changes that the electronic product may face during actual use, professional temperature control testing equipment and software are used to perform precise theoretical calculations based on the NTC temperature control principle, combined with a large amount of actual test data. By simulating normal operation, full-load operation, and possible fault states of the electronic product under different ambient temperatures, the battery temperature changes and the response of the NTC control circuit are monitored. The resistance values ​​of the high and low temperature NTC control resistors are repeatedly adjusted until an optimal set of resistance parameters is found. This ensures that the battery's operating temperature can be stably maintained within the safe operating temperature range under various operating conditions, ensuring the safe and reliable operation of the electronic product, while maximizing the battery's performance advantages and extending its lifespan.

[0048] 5. Application of Non-Standard Structure Products: For special electronic products that lack typical battery positive and negative electrode mounting structures, the R&D team should thoroughly analyze the product's structural characteristics, battery mounting methods, and heat conduction paths. For example, for products using irregularly shaped batteries or special fixing methods, it may be necessary to cleverly mount the temperature sensor on a metal structural component near the battery. By optimizing the heat conduction path, such as by adding thermal pads or thermal grease, efficient heat conduction between the temperature sensor and the battery can be achieved. Alternatively, the connection method of the temperature sensor can be innovatively designed, using a wireless transmission module to send the temperature signal to the NTC control circuit on the integrated circuit board to overcome the wiring difficulties caused by structural limitations. In short, based on the basic principles of this utility model, innovative thinking should be fully utilized, and various technical means should be flexibly applied to achieve effective control and monitoring of battery temperature, ensuring the safe and stable operation of the product under different ambient temperatures and meeting the market's requirements for temperature control safety in electronic products.

[0049] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0050] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A battery temperature control NTC circuit structure, characterized in that, include: An NTC control circuit is installed on the integrated circuit board of an electronic product, and a temperature sensor connection point is led out from the NTC control circuit near the positive terminal of the battery. A temperature sensor connected to the temperature sensor connection point, wherein the temperature sensor is connected to the NTC pole of the NTC control circuit via an insulated flexible wire; A positive electrode plate for a battery, wherein one side of the positive electrode plate is in contact with the positive electrode of the battery, and the other side of the positive electrode plate is exposed and has a contact area adapted to the size of the temperature sensor; The thermally conductive adhesive is applied to the exposed surface of the positive electrode of the battery. The probe of the temperature sensor is attached to the exposed surface through the thermally conductive adhesive and reinforced and stabilized by the outer assembly structure of the positive electrode. Alternatively, it can be reinforced and stabilized with the positive electrode by using any one of adhesive foam, hot melt adhesive, or quick-drying adhesive and then filling the surrounding area with thermally conductive adhesive.

2. The battery temperature control NTC circuit structure according to claim 1, characterized in that, The temperature sensor is a thermistor, which can quickly and sensitively detect the instantaneous temperature of the battery so that the NTC control circuit can make an accurate and timely safety control response. The probe of the temperature sensor is closely attached to the metal surface of the positive electrode of the battery. This metal surface is the other side of the convex structure stamped from a metal sheet with good conductivity and thermal conductivity. Alternatively, when the thermal conductivity structure of the negative electrode or other battery parts does not conform to the characteristics of the conventional positive electrode, the battery position with the best thermal conductivity structure is used as the contact point for the probe of the temperature sensor.

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