Lithium battery management circuit with high heat dissipation performance

Abstract

The utility model discloses a lithium battery management circuit with high heat dissipation performance. The lithium battery management circuit comprises a control module, an input module, an energy storage management module and an output module, the input module, the energy storage management module and the output module are electrically connected with the control module respectively; the energy storage management module comprises a charging inductor and a heat conduction bridge; the charging inductor is electrically connected with the control module; the heat conduction bridge is connected to the two sides of the charging inductor and used for dissipating heat generated by the charging inductor in the rapid charging process. The two ends of the charging inductor are connected with the heat conduction bridge, the temperature of the inductor is reduced by 10-15 DEG C without modifying any electronic parameters, the application environment temperature range of the product is expanded under the condition that the temperature is reduced by 10 DEG C, and the four power tubes are electrically connected with the heat conduction bridge and the two ends of the charging inductor, so that the temperature of the power tubes during fast charging is reduced; and the service life of the power tube is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery fast charging management circuits, and in particular to a lithium battery management circuit with high heat dissipation performance. Background Art

[0002] "Lithium batteries are a type of battery that uses lithium metal or lithium alloy as the negative electrode material and a non-aqueous electrolyte solution. Due to the very active chemical properties of lithium metal, the processing, storage, and use of lithium metal have very high environmental requirements. With the development of science and technology, lithium batteries have now become mainstream, and people are using more and more electronic products. Lithium-ion batteries, with their excellent properties, are widely used in portable electronic devices such as mobile phones, camcorders, laptops, cordless phones, power tools, remote control or electric toys, cameras, etc. The lithium battery management circuit is specifically used to manage the charging of lithium-ion batteries.

[0003] Lithium batteries, when fast-charged, are capable of receiving large amounts of current in a short period of time. They store energy in a short period of time, and the charge management circuitry delivers high current and charge to increase charging speed. Fast-charging lithium batteries are high-rate lithium batteries that can be fully charged to 80% or 100% in a short period of time. Fast charging is achieved by modifying the battery's electrolyte formula, enabling it to withstand high currents and achieve full charge in a short period of time, thereby achieving higher current levels. This is the most significant feature of fast-charging, high-rate lithium batteries.

[0004] When fast-charging a high-rate lithium battery, the voltage across the inductor changes by the output voltage within a switching cycle, with a large amplitude. This results in large high-frequency switching ripple in the inductor current. When the switch is off, the voltage across it equals the output voltage, resulting in high voltage stress on the switch. When the output voltage of a switching power supply is high, excessive high-frequency current can generate severe electromagnetic interference (EMI) and cause severe inductor heating, seriously shortening the life of the charging inductor.

[0005] Therefore, it is necessary to dissipate the heat generated by the charging inductor during fast charging. Summary of the Invention

[0006] In the prior art, when fast charging a lithium battery, the large current transmitted causes the charger's inductor to heat up severely, shortening the life of the charger's charging inductor.

[0007] To address the above issues, a lithium battery management circuit with high heat dissipation performance is proposed. By connecting a thermal bridge at both ends of the charging inductor, the inductor temperature can be reduced by 10-15 degrees without modifying any electronic parameters. By reducing the temperature by 10 degrees, the product's application ambient temperature range is expanded. By electrically connecting the four power tubes to the thermal bridge and both ends of the charging inductor, the temperature of the power tubes during fast charging is reduced, thereby increasing the life of the power tubes.

[0008] A lithium battery management circuit with high heat dissipation performance comprises:

[0009] a control module;

[0010] an input module;

[0011] an energy storage management module;

[0012] an output module;

[0013] The input module, the energy storage management module, and the output module are electrically connected to the control module;

[0014] The energy storage management module comprises:

[0015] a charging inductor;

[0016] a heat-conducting bridge;

[0017] The charging inductor is electrically connected to the control module;

[0018] The heat-conducting bridge is connected to both sides of the charging inductor and is used to dissipate heat generated by the charging inductor during fast charging.

[0019] In a first possible implementation of the lithium battery management circuit with high heat dissipation performance, the control module comprises:

[0020] a control chip;

[0021] The control chip comprises:

[0022] a first pin and a second pin;

[0023] The first end of the charging inductor is electrically connected to the first pin, and the second end is electrically connected to the second pin.

[0024] In a second possible implementation of the first possible implementation of the lithium battery management circuit with high heat dissipation performance, the heat-conducting bridge comprises:

[0025] a first heat-conducting element, a second heat-conducting element, a third heat-conducting element, and a fourth heat-conducting element;

[0026] The first end of the first heat-conducting element and the first end of the second heat-conducting element are connected to the first end of the charging inductor, and the first end of the third heat-conducting element and the first end of the fourth heat-conducting element are connected to the second end of the charging inductor;

[0027] The second ends of the first heat-conducting element, the second heat-conducting element, the third heat-conducting element, and the fourth heat-conducting element are connected to ground.

[0028] The utility model discloses a lithium battery management circuit of high heat dissipation performance, third possible implementation, the energy storage management module still includes:

[0029] First power tube, second power tube,

[0030] The drain of first power tube is connected with input module, and the grid is connected with the third pin of control chip through first resistance, and the source of first power tube and the drain of second power tube are connected with the first end of charging inductance,

[0031] The source of second power tube is grounded.

[0032] In combination with the third possible implementation of the utility model, fourth possible implementation, the energy storage management module still includes:

[0033] Third power tube, fourth power tube,

[0034] The grid of third power tube is connected with the grid of second power tube through second resistance and third resistance, and the source of third power tube is grounded, and the drain of third power tube and the source of fourth power tube are connected with the second end of charging inductance, and the grid of fourth power tube is connected with control chip through fourth resistance, and the drain of fourth power tube is connected with output module.

[0035] In combination with the fourth possible implementation of the utility model, fifth possible implementation, the energy storage management module still includes:

[0036] First voltage stabilizing filter unit,

[0037] The first voltage stabilizing filter unit includes:

[0038] Fifth resistance and first capacitor,

[0039] The first end of fifth resistance is connected with the first end of charging inductance, and the second end is connected with the first end of first capacitor, and the second end of first capacitor is grounded.

[0040] In combination with the fifth possible implementation of the utility model, sixth possible implementation, the energy storage management module still includes:

[0041] Second voltage stabilizing filter unit,

[0042] The second voltage stabilizing filter unit includes:

[0043] Sixth resistance and second capacitor,

[0044] The first end of the sixth resistor is commonly connected to the second end of the charging inductor, the second end of the sixth resistor is electrically connected to the first end of the second capacitor, and the second end of the second capacitor is grounded.

[0045] The lithium battery management circuit with high heat dissipation performance described in the utility model is implemented. By connecting a thermal bridge at both ends of the charging inductor, the inductor temperature is reduced by 10-15 degrees without modifying any electronic parameters. With the temperature reduced by 10 degrees, the product's application environment temperature range is expanded. By electrically connecting four power tubes to the thermal bridge and both ends of the charging inductor, the temperature of the power tubes during fast charging is reduced, thereby increasing the life of the power tubes. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only 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.

[0047] Figure 1 This is a schematic diagram of the circuit structure of the lithium battery management circuit with high heat dissipation performance in the present invention.

[0048] Components and their serial numbers:

[0049] 100 - control module, 200 - input module, 300 - energy storage management module, 310 - thermal bridge, 320 - first voltage stabilizing and filtering unit, 330 - second voltage stabilizing and filtering unit. DETAILED DESCRIPTION

[0050] The following is a clear and complete description of the technical solutions of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by ordinary technicians in this field without creative work are all within the scope of protection of the present invention.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are intended only to describe specific embodiments and are not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0052] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0053] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore cannot be understood as a limitation on this application.

[0054] 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0055] In the prior art, when a lithium battery is fast charged, the large current transmitted causes the inductor L1 of the charger to heat up severely, thereby shortening the life of the charging inductor L1 of the charger.

[0056] In order to solve the above problems, a lithium battery management circuit with high heat dissipation performance is proposed.

[0057] A lithium battery management circuit with high heat dissipation performance includes a control module 100, an input module 200, an energy storage management module 300, and an output module. The input module 200, energy storage management module 300, and output module are each electrically connected to the control module 100. The energy storage management module 300 includes a charging inductor L1 and a thermal bridge 310. The charging inductor L1 is electrically connected to the control module 100. The thermal bridge 310 is connected to both sides of the charging inductor L1 to dissipate heat generated by the charging inductor L1 during rapid charging. By connecting the thermal bridge 310 at both ends of the charging inductor L1, the temperature of the inductor L1 is reduced by 10-15 degrees Celsius without modifying any electronic parameters. With this 10-degree temperature reduction, the product's application ambient temperature range is expanded. By electrically connecting four power transistors to the thermal bridge 310 and both ends of the charging inductor L1, the temperature of the power transistors during rapid charging is reduced, thereby increasing their lifespan.

[0058] In this embodiment, the control module 100 includes a control chip that manages the entire charging or fast charging process. The input module 200 rectifies and steps down the AC power and inputs the power supply voltage required for charging. The energy storage management module 300 smoothly processes and stores the transmission current during the charging process. The output module uses the charge output by the energy storage management module 300 to charge the lithium battery pack.

[0059] Further, such as Figure 1 , Figure 1 This is a schematic diagram of the circuit structure of a lithium battery management circuit with high heat dissipation performance in the present invention; the control module 100 includes a control chip U1; the control chip U1 includes: a first pin PIN1 and a second pin PIN2; the first end of the charging inductor L1 is electrically connected to the first pin, and the second end is electrically connected to the second pin.

[0060] In this embodiment, the thermal bridge 310 includes a first thermally conductive element J1, a second thermally conductive element J2, a third thermally conductive element J3, and a fourth thermally conductive element J4. The first ends of the first thermally conductive element J1 and the second thermally conductive element J2 are connected to the first end of the charging inductor L1, and the first ends of the third thermally conductive element J3 and the fourth thermally conductive element J4 are connected to the second end of the charging inductor L1. The second ends of the first thermally conductive element J1, the second thermally conductive element J2, the third thermally conductive element J3, and the fourth thermally conductive element J4 are connected to a common ground.

[0061] It is worth noting that in some embodiments, a single thermal conductive element may be connected to the charging inductor L1, or multiple thermal conductive elements may be connected in parallel at both ends of the charging inductor L1. A single thermal conductive element may be connected in series with the charging inductor L1, or multiple thermal conductive elements may be connected in series at both ends of the charging inductor L1. The embodiments of the present application do not limit the number and connection method of the thermal conductive elements.

[0062] Furthermore, the energy storage management module 300 also includes a first power tube Q1 and a second power tube Q2; the drain of the first power tube Q1 is electrically connected to the input module 200, and the gate is electrically connected to the third pin PIN3 of the control chip U1 through the first resistor R1. The source of the first power tube Q1 and the drain of the second power tube Q2 are commonly connected to the first end of the charging inductor L1, and the source of the second power tube Q2 is grounded.

[0063] Furthermore, the energy storage management module 300 also includes:

[0064] A third power tube Q3 and a fourth power tube Q4;

[0065] The gate of the third power tube Q3 is electrically connected to the gate of the second power tube Q2 through the second resistor R2 and the third resistor R3. The source of the third power tube Q3 is grounded. The drain of the third power tube Q3 and the source of the fourth power tube Q4 are connected to the second end of the charging inductor L1. The gate of the fourth power tube Q4 is electrically connected to the fourth pin PIN4 of the control chip U1 through the fourth resistor R4. The drain of the fourth power tube Q4 is electrically connected to the output module.

[0066] Furthermore, the energy storage management module 300 also includes a first voltage stabilizing filter unit 320; the first voltage stabilizing filter unit 320 includes: a fifth resistor R5 and a first capacitor C1; the first end of the fifth resistor R5 is connected to the first end of the charging inductor L1, the second end is electrically connected to the first end of the first capacitor C1, and the second end of the first capacitor C1 is grounded.

[0067] Furthermore, the energy storage management module 300 also includes a second voltage stabilizing and filtering unit 330; the second voltage stabilizing and filtering unit 330 includes: a sixth resistor R6 and a second capacitor C2; the first end of the sixth resistor R6 is connected to the second end of the charging inductor L1, the second end is electrically connected to the first end of the second capacitor C2, and the second end of the second capacitor C2 is grounded.

[0068] The lithium battery management circuit with high heat dissipation performance of the present invention connects a thermal bridge at both ends of the charging inductor L1, thereby reducing the inductor temperature by 10-15 degrees without modifying any electronic parameters. By reducing the temperature by 10 degrees, the application environment temperature range of the product is expanded. By electrically connecting the four power tubes to the thermal bridge and both ends of the charging inductor, the temperature of the power tubes during fast charging is reduced, thereby increasing the life of the power tubes.

[0069] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A lithium battery management circuit with high heat dissipation performance, characterized in that: include: Control module; Input module; Energy storage management module; Output module; The input module, energy storage management module, and output module are electrically connected to the control module respectively; The energy storage management module includes: Charging inductor; Thermal bridge; The charging inductor is electrically connected to the control module; The heat-conducting bridge is connected to both sides of the charging inductor and is used to dissipate heat generated by the charging inductor during the fast charging process.

2. The lithium battery management circuit with high heat dissipation performance according to claim 1, characterized in that: The control module includes: Control chip; The control chip includes: A first pin and a second pin; The first end of the charging inductor is electrically connected to the first pin, and the second end of the charging inductor is electrically connected to the second pin.

3. The lithium battery management circuit with high heat dissipation performance according to claim 2, characterized in that: The thermal bridge comprises: a first heat conducting element, a second heat conducting element, a third heat conducting element, and a fourth heat conducting element; The first ends of the first heat conducting element and the second heat conducting element are connected to the first end of the charging inductor, and the first ends of the third heat conducting element and the fourth heat conducting element are connected to the second end of the charging inductor; The second ends of the first heat conducting element, the second heat conducting element, the third heat conducting element and the fourth heat conducting element are connected to the ground.

4. The lithium battery management circuit with high heat dissipation performance according to claim 3, characterized in that: The energy storage management module also includes: A first power tube and a second power tube; The drain of the first power tube is electrically connected to the input module, the gate of the first power tube is electrically connected to the third pin of the control chip via a first resistor, and the source of the first power tube and the drain of the second power tube are commonly connected to the first end of the charging inductor; The source of the second power tube is grounded.

5. The lithium battery management circuit with high heat dissipation performance according to claim 4, characterized in that: The energy storage management module also includes: A third power tube and a fourth power tube; The gate of the third power tube is electrically connected to the gate of the second power tube through the second resistor and the third resistor, the source of the third power tube is grounded, the drain of the third power tube and the source of the fourth power tube are commonly connected to the second end of the charging inductor, the gate of the fourth power tube is electrically connected to the fourth pin of the control chip through the fourth resistor, and the drain of the fourth power tube is electrically connected to the output module.

6. The lithium battery management circuit with high heat dissipation performance according to claim 5, characterized in that: The energy storage management module also includes: a first voltage stabilizing and filtering unit; The first voltage stabilizing and filtering unit includes: a fifth resistor and a first capacitor; A first end of the fifth resistor is commonly connected to a first end of the charging inductor, a second end of the fifth resistor is electrically connected to a first end of the first capacitor, and a second end of the first capacitor is grounded.

7. The lithium battery management circuit with high heat dissipation performance according to claim 6, characterized in that: The energy storage management module also includes: A second voltage stabilizing and filtering unit; The second voltage stabilizing and filtering unit includes: a sixth resistor and a second capacitor; The first end of the sixth resistor is commonly connected to the second end of the charging inductor, the second end of the sixth resistor is electrically connected to the first end of the second capacitor, and the second end of the second capacitor is grounded.

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