Battery charging and discharging method based on integrated module

Abstract

The invention discloses a battery charging and discharging method based on an integrated module, and relates to the technical field of battery charging and discharging, and the battery charging method comprises the steps: controlling a rectification and inversion circuit to be communicated with an external power supply, converting low-frequency alternating current into low-frequency direct current through the rectification and inversion circuit, outputting the low-frequency direct current, converting the low-frequency direct current into high-frequency direct current through a frequency conversion circuit, and outputting the high-frequency direct current; the high-frequency inverter circuit converts the high-frequency direct current into high-frequency alternating current to be output, the transformer is adopted to carry out voltage reduction on the high-frequency alternating current, and the high-frequency rectifier inverter circuit converts the high-frequency alternating current into the high-frequency direct current to be output to the battery. Otherwise, the method is a battery discharging method. According to the method, the radiator, the charging and discharging circuit, the DBC ceramic substrate and the insulator are integrated into an integrated module for charging and discharging in advance, so that the purposes of improving the production efficiency, reducing the product size, improving the shockproof and anti-collision capability, enhancing the water vapor / dust isolation capability, improving the reliability, improving the product quality and guaranteeing the final charging and discharging effect can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery charging and discharging, and in particular to a battery charging and discharging method based on an integrated module. Background Art

[0002] A battery is an energy storage device that converts chemical energy directly into electrical energy. Its working principle is: when charging, it uses external electrical energy to regenerate internal active substances and store electrical energy as chemical energy. When discharging, it converts chemical energy into electrical energy output again. As the most commonly used energy storage device today, batteries are also increasingly widely used in electric vehicles, aircraft, mobile phones, medical and other industries.

[0003] The use of batteries is inseparable from charging and discharging. At present, the charging and discharging of batteries are usually achieved by the cooperation of rectifier circuits, frequency conversion circuits, inverter circuits, transformers and other related components. For example, the patent documents with announcement numbers CN201918762U and CN203707860U both disclose related charging and discharging technologies. Although these charging and discharging technologies have good charging and discharging effects, careful analysis shows that since these charging and discharging technologies all use separate circuits, they also need to be assembled separately and installed on the radiator in actual applications, resulting in low production efficiency, large product size, poor shock and collision resistance, poor water vapor / dust isolation ability, poor reliability, easy quality problems and technical problems that affect the final charging and discharging effect.

[0004] Therefore, it is necessary to provide an integrated charging and discharging technology to solve the above technical problems. Summary of the invention

[0005] In order to overcome the above-mentioned technical problems existing in the prior art, the present invention provides a battery charging and discharging method based on an integrated module. The method is based on pre-integrating a heat sink, a charging and discharging circuit, a DBC ceramic substrate and an insulator into an integrated module for charging and discharging. Compared with the existing separately assembled charging and discharging technology, the method can achieve the purpose of improving production efficiency, reducing product volume, improving shock and collision resistance, enhancing water vapor / dust isolation capability, improving reliability, improving product quality and ensuring the final charging and discharging effect.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is as follows: A battery charging and discharging method based on an integrated module, the integrated module comprising a first integrated module and a second integrated module, the first integrated module comprising a first radiator, a first DBC ceramic substrate being fixed on the first radiator, a first insulator and a rectifier inverter circuit, a frequency conversion circuit and a high-frequency inverter circuit connected in sequence being fixed on the first DBC ceramic substrate, the rectifier inverter circuit, the frequency conversion circuit and the high-frequency inverter circuit being all encapsulated in the first insulator; the second integrated module comprising a second radiator, a second DBC ceramic substrate being fixed on the second radiator, a high-frequency rectifier inverter circuit and a second insulator being fixed on the second DBC ceramic substrate, the high-frequency rectifier inverter circuit being encapsulated in the second insulator; The battery charging and discharging method includes a battery charging method and a battery discharging method, wherein: The battery charging method comprises: controlling the rectifier inverter circuit to be connected with an external power source, converting low-frequency alternating current into low-frequency direct current output by the rectifier inverter circuit, converting low-frequency direct current into high-frequency direct current output by the frequency conversion circuit, converting high-frequency direct current into high-frequency alternating current output by the high-frequency inverter circuit, stepping down the high-frequency alternating current by a transformer, and converting the stepped-down high-frequency alternating current into high-frequency direct current by the high-frequency rectifier inverter circuit and outputting the high-frequency direct current to the battery for charging; The battery discharge method comprises the following steps: controlling the rectifier inverter circuit to be connected to the load, inverting the high-frequency direct current output by the battery into a high-frequency alternating current output by the high-frequency rectifier inverter circuit, boosting the high-frequency alternating current by a transformer, inverting the boosted high-frequency alternating current into a high-frequency direct current output by the high-frequency inverter circuit, and converting the high-frequency direct current into a low-frequency alternating current by the rectifier inverter circuit and outputting the low-frequency alternating current to the load for discharge.

[0007] The first insulator is fixed on the first DBC ceramic substrate by potting / molding, and the second insulator is fixed on the second DBC ceramic substrate by potting / molding.

[0008] In the battery charging method, using a transformer to step down the high-frequency alternating current means stepping down the high-frequency alternating current to 24V, 36V, 48V or 72V; in the battery discharging method, using a transformer to step up the high-frequency alternating current means stepping up the high-frequency alternating current to 220V.

[0009] The first radiator and the second radiator both have a mounting plane, on which a copper connection layer is fixed, the lower surface of the first DBC ceramic substrate is welded to the copper connection layer of the first radiator, and the rectifier inverter circuit, the frequency conversion circuit and the high-frequency inverter circuit are all located on the upper surface of the first DBC ceramic substrate; the lower surface of the second DBC ceramic substrate is welded to the copper connection layer of the second radiator, and the high-frequency rectifier inverter circuit is located on the upper surface of the second DBC ceramic substrate.

[0010] The sides between the upper and lower surfaces of the first DBC ceramic substrate are all wrapped by the first insulator.

[0011] The sides between the upper and lower surfaces of the second DBC ceramic substrate are all wrapped by the second insulator.

[0012] The length, width and height of the first integrated module do not exceed 120*970*80mm.

[0013] The length, width and height of the second integrated module do not exceed 100*70*80 mm.

[0014] The advantages of adopting the present invention are: 1. The key innovation of the present invention is that an integrated module that pre-integrates the radiator, the charge and discharge circuit, the DBC ceramic substrate and the insulator is used for charge and discharge. Among them, the upper and lower surfaces of the DBC ceramic substrate are provided with copper foils, the upper surface copper foil is designed as a functional circuit for installing the charge and discharge circuit, and the lower surface copper foil is designed to facilitate connection with the radiator. Through this integrated solution, the first aspect can effectively reduce the volume of the charge and discharge structure, which has the advantage of facilitating the miniaturization of the charge and discharge structure; the second aspect can quickly and standardly realize the production and assembly of the product, which has the advantage of improving production efficiency; the third aspect can completely wrap the charge and discharge circuit through the insulator, and can isolate the voltage of the circuit between the copper foils on the DBC ceramic substrate and protect the chip surface, so as to prevent the copper foil on the surface of the DBC ceramic substrate and the charge and discharge circuit from being accidentally damaged, which has the advantages of improving reliability, improving product quality and ensuring the final charge and discharge effect; the fourth aspect is to facilitate reliable installation with other components, which has the advantages of simplifying the installation process and reducing labor costs. In summary, the present invention has the advantages of improving production efficiency, reducing product volume, improving shock and collision resistance, enhancing water vapor / dust isolation, improving reliability, improving product quality and ensuring the final charge and discharge effect.

[0015] 2. The present invention designs the sides between the upper and lower surfaces of the DBC ceramic substrate to be wrapped by an insulator, which can wrap the DBC ceramic substrate and the charging and discharging circuit in the insulator, which is beneficial to improving the shock and collision resistance during discharge and enhancing the water vapor / dust isolation ability, thereby ensuring a more stable and reliable charging and discharging effect.

[0016] 3. The hardware device involved in the present invention has a simple structure, a small size and is easy to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 is a circuit schematic diagram of the present invention; Figure 3 is a schematic diagram of a transverse cross-sectional structure of a first integrated module; Figure 4 is a schematic diagram of a longitudinal cross-sectional structure of a first integrated module; Figure 5 is a schematic diagram of the three-dimensional structure of the first integrated module; Figure 6 is a schematic diagram of the longitudinal structure of the second integrated module; Figure 7 It is a schematic diagram of the three-dimensional structure of the second integrated module.

[0018] Marked in the figure: 1. rectifier inverter circuit, 2. frequency conversion circuit, 3. high-frequency inverter circuit, 4. high-frequency rectifier inverter circuit, 5. first integrated module, 6. second integrated module, 7. transformer, 8. first radiator, 9. first DBC ceramic substrate, 10. first insulator, 11. second radiator, 12. second DBC ceramic substrate, 13. second insulator, 14. battery, 15. pin. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention, but are not used to limit the present invention.

[0020] like Figure 1 , 2 As shown, the present invention provides a battery charging and discharging method based on an integrated module, wherein the integrated module includes a first integrated module 5 and a second integrated module 6, wherein the first integrated module 5 and the second integrated module 6 are connected via a transformer 7, and the second integrated module 6 is connected to a battery 14. like Figure 3-5 As shown, the first integrated module 5 includes a first heat sink 8, on which a first DBC ceramic substrate 9 is fixed. Crucially, a first insulator 10 and a rectifier inverter circuit 1, a frequency conversion circuit 2 and a high-frequency inverter circuit 3 connected in sequence are fixed on the first DBC ceramic substrate 9. The first insulator 10 is fixed on the first DBC ceramic substrate 9 by potting / plastic sealing. The rectifier inverter circuit 1, the frequency conversion circuit 2 and the high-frequency inverter circuit 3 are all encapsulated in the first insulator 10, thereby forming a charge-discharge integrated module with a small size, improved shock and collision resistance, and enhanced water vapor / dust isolation capability.

[0021] like Figure 6-7As shown, the second integrated module 6 includes a second heat sink 11, on which a second DBC ceramic substrate 12 is fixed. Crucially, a high-frequency rectifier inverter circuit 4 and a second insulator 13 are fixed on the second DBC ceramic substrate 12. The second insulator 13 is fixed on the second DBC ceramic substrate 12 by potting / plastic sealing, and the high-frequency rectifier inverter circuit 4 is encapsulated in the second insulator 13, thereby forming a charge-discharge integrated module with a small size, improved shock and collision resistance, and enhanced water vapor / dust isolation capability.

[0022] The above-mentioned rectifier inverter circuit 1 is used to convert low-frequency AC power into low-frequency DC power output when the battery 14 is charged, or to convert high-frequency DC power into low-frequency AC power output when the battery 14 is discharged. The frequency conversion circuit 2 is used to convert low-frequency DC power into high-frequency DC power output when the battery 14 is charged. The high-frequency inverter circuit 3 is used to convert high-frequency DC power into high-frequency AC power output when the battery 14 is charged, or to invert high-frequency AC power into high-frequency DC power output when the battery 14 is discharged. The high-frequency rectifier inverter circuit 4 is used to convert high-frequency AC power into high-frequency DC power output when the battery 14 is charged, or to invert high-frequency DC power into high-frequency AC power output when the battery 14 is discharged.

[0023] Based on the above-mentioned integrated module, the battery 14 charging method of the present invention is: control the rectifier inverter circuit 1 to be connected with the external power supply, the rectifier inverter circuit 1 converts the low-frequency AC power into a low-frequency DC power output, the frequency conversion circuit 2 converts the low-frequency DC power into a high-frequency DC power output, the high-frequency inverter circuit 3 converts the high-frequency DC power into a high-frequency AC power output, the transformer 7 is used to reduce the voltage of the high-frequency AC power, and the high-frequency rectifier inverter circuit 4 converts the reduced high-frequency AC power into a high-frequency DC power and outputs it to the battery 14 for charging.

[0024] Based on the above-mentioned integrated module, the battery 14 discharge method of the present invention is: control the rectifier inverter circuit 1 to be connected with the load, the high-frequency rectifier inverter circuit 4 inverts the high-frequency direct current output by the battery 14 into a high-frequency alternating current output, the transformer 7 is used to boost the high-frequency alternating current, the high-frequency inverter circuit 3 inverts the boosted high-frequency alternating current into a high-frequency direct current output, and the rectifier inverter circuit 1 converts the high-frequency direct current into a low-frequency alternating current and outputs it to the load for discharge.

[0025] In the above-mentioned battery charging method, using a transformer to reduce the voltage of high-frequency AC power means reducing the voltage of high-frequency AC power to 24V, 36V, 48V or 72V; in the above-mentioned battery discharging method, using a transformer to boost the voltage of high-frequency AC power means boosting the voltage of high-frequency AC power to 220V. The function of boosting is to output and replace the mains power for use as a power source; the function of reducing the voltage is to match the battery voltage to prevent the risk of battery failure.

[0026] In this embodiment, the length, width and height of the first integrated module do not exceed 120*970*80 mm, and the length, width and height of the second integrated module do not exceed 100*70*80 mm. It has the advantages of small size and easy installation.

[0027] In a specific embodiment, the first radiator 8 and the second radiator 11 can both adopt a fin heat dissipation structure, one side of which has a heat dissipation fin and the other side has a mounting plane, and a copper connection layer (not shown in the figure) is fixed on the mounting plane. The lower surface of the first DBC ceramic substrate 9 is welded to the copper connection layer of the first radiator 8, and the rectifier inverter circuit 1, the frequency conversion circuit 2 and the high-frequency inverter circuit 3 are all located on the upper surface of the first DBC ceramic substrate 9; the lower surface of the second DBC ceramic substrate 12 is welded to the copper connection layer of the second radiator 11, and the high-frequency rectifier inverter circuit 4 is located on the upper surface of the second DBC ceramic substrate 12.

[0028] In this embodiment, the first heat sink 8 and the second heat sink 11 can be a metal aluminum heat sink or a ceramic heat sink, etc., and the copper connection layer can be a copper-plated layer coated on the mounting plane or a copper plate fixed to the mounting plane by screws to ensure that the integrated module has better heat dissipation capability.

[0029] In a specific embodiment, the sides between the upper and lower surfaces of the first DBC ceramic substrate 9 are wrapped by the first insulator 10, and the sides between the upper and lower surfaces of the second DBC ceramic substrate 12 are wrapped by the second insulator 13. By wrapping the DBC ceramic substrate and the charging and discharging circuit in the insulator, the shock and collision resistance of the charging and discharging structure can be improved, and the water vapor / dust isolation capability can be enhanced.

[0030] In this embodiment, after the DBC ceramic substrate is wrapped by the insulator, the overall area of ​​the lower surface thereof can be the same as or different from the area of ​​the mounting plane on the heat sink.

[0031] The rectifier inverter circuit 1, the frequency conversion circuit 2, the high-frequency inverter circuit 3 and the high-frequency rectifier inverter circuit 4 in the present invention are all existing conventional circuits. Figure 2 The specific circuit schematic diagram of the present invention when charging and discharging the battery 14 is shown. Specifically, the rectifier inverter circuit 1 includes 4 IGBT single-tube chips, namely Q55 chip, Q53 chip, Q61 chip and Q62 chip. The frequency conversion circuit 2 includes 1 IGBT single-tube chip Q29, 1 FRD single-tube chip D8 and inductor L1. The high-frequency inverter circuit 3 includes 4 IGBT single-tube chips, namely Q31 chip, Q33 chip, Q35 chip and Q37 chip. The high-frequency rectifier inverter circuit 4 includes 4 mosfet single-tube chips, namely Q5 chip, Q24 chip, Q10 chip and Q19 chip. It should be noted that the pins 15 of the aforementioned chips all extend out of the insulator.

[0032] Now combined with the attached Figure 2 The charging and discharging principle of this embodiment in actual use is described as follows: A. Battery 14 Charging Process A1. External AC power is input to the rectifier inverter circuit 1 through interfaces VL4 and VN3. The rectifier inverter circuit 1 rectifies through the Q55 chip, Q53 chip, Q61 chip and Q62 chip, converts the low-frequency AC power into low-frequency DC power and outputs it to the frequency conversion circuit 2.

[0033] A2. The frequency conversion circuit 2 converts low-frequency DC power into high-frequency DC power through the Q29 chip, inductor L1, and FRD single-tube chip D8 and outputs a high-frequency inverter circuit 3.

[0034] A3. The high-frequency inverter circuit 3 converts high-frequency direct current into high-frequency alternating current through the Q31 chip, the Q33 chip, the Q35 chip and the Q37 chip and outputs it to the transformer 7.

[0035] A4. After the transformer 7 steps down the high-frequency AC power, the high-frequency rectifier inverter circuit 4 converts the stepped-down high-frequency AC power into high-frequency DC power through the Q5 chip, the Q24 chip, the Q10 chip and the Q19 chip and inputs the stepped-down high-frequency AC power into the battery 14 , thereby charging the battery 14 .

[0036] B. Discharging process of battery 14 B1. The battery 14 outputs high-frequency direct current, and the high-frequency rectifying and inverting circuit 4 inverts the high-frequency direct current into high-frequency alternating current through the Q5 chip, the Q24 chip, the Q10 chip, and the Q19 chip and outputs it to the transformer 7.

[0037] B2. After the transformer 7 boosts the high-frequency AC power, the boosted high-frequency AC power is inverted into high-frequency DC power through the Q31 chip, Q33 chip, Q35 chip and Q37 chip of the high-frequency inverter circuit 3 and output to the rectifier inverter circuit 1.

[0038] B3. The rectifier inverter circuit 1 converts high-frequency direct current into low-frequency alternating current output through the Q55 chip, the Q53 chip, the Q61 chip and the Q62 chip, thereby achieving the discharge of the battery 14.

[0039] The present invention is based on the charging and discharging technology of the integrated module, and only needs to be welded and fixed to the DBC ceramic substrate and the radiator once, and there is no need to weld and fix each circuit on a different radiator separately. Moreover, according to tests, compared with the existing split-type and separately installed charging and discharging technology, the present invention can save more than 30% of the volume of the hardware structure on the one hand, and can achieve a cost reduction of not less than 20% on the other hand, and can provide a more stable and reliable charging and discharging effect on the other hand.

[0040] The above description is only a specific implementation mode of the present invention. Any feature disclosed in this specification, unless otherwise stated, can be replaced by other equivalent or alternative features with similar purposes; all disclosed features, or all methods or steps in the process, except for mutually exclusive features and / or steps, can be combined in any way.

Claims

1. A battery charging and discharging method based on an integrated module, characterized in that: The integrated module comprises a first integrated module (5) and a second integrated module (6); the first integrated module (5) comprises a first heat sink (8); a first DBC ceramic substrate (9) is fixed on the first heat sink (8); a first insulator (10) and a rectifier inverter circuit (1), a frequency conversion circuit (2) and a high-frequency inverter circuit (3) connected in sequence are fixed on the first DBC ceramic substrate (9); the rectifier inverter circuit (1), the frequency conversion circuit (2) and the high-frequency inverter circuit (3) are all packaged in the first insulator (10); the second integrated module (6) comprises a second heat sink (11); a second DBC ceramic substrate (12) is fixed on the second heat sink (11); a high-frequency rectifier inverter circuit (4) and a second insulator (13) are fixed on the second DBC ceramic substrate (12); the high-frequency rectifier inverter circuit (4) is packaged in the second insulator (13); The battery (14) charging and discharging method comprises a battery (14) charging method and a battery (14) discharging method, wherein: The battery (14) is charged by: controlling the rectifying and inverting circuit (1) to be connected to an external power source, the rectifying and inverting circuit (1) converts low-frequency alternating current into low-frequency direct current for output, the frequency conversion circuit (2) converts low-frequency direct current into high-frequency direct current for output, the high-frequency inverter circuit (3) converts high-frequency direct current into high-frequency alternating current for output, a transformer (7) is used to reduce the voltage of the high-frequency alternating current, and the high-frequency rectifying and inverting circuit (4) converts the reduced-voltage high-frequency alternating current into high-frequency direct current and outputs it to the battery (14) for charging; The battery (14) discharge method comprises: controlling the rectifier inverter circuit (1) to be connected to the load, using the high-frequency rectifier inverter circuit (4) to invert the high-frequency direct current output by the battery (14) into high-frequency alternating current output, using the transformer (7) to boost the high-frequency alternating current, using the high-frequency inverter circuit (3) to invert the boosted high-frequency alternating current into high-frequency direct current output, and using the rectifier inverter circuit (1) to convert the high-frequency direct current into low-frequency alternating current and output it to the load for discharge.

2. A battery charging and discharging method based on an integrated module according to claim 1, characterized in that: The first insulator (10) is fixed on the first DBC ceramic substrate (9) by potting / molding, and the second insulator (13) is fixed on the second DBC ceramic substrate (12) by potting / molding.

3. A battery charging and discharging method based on an integrated module according to claim 1, characterized in that: In the battery charging method, using the transformer (7) to reduce the voltage of the high-frequency alternating current means reducing the voltage of the high-frequency alternating current to 24V, 36V, 48V or 72V; and in the battery discharging method, using the transformer (7) to increase the voltage of the high-frequency alternating current means increasing the voltage of the high-frequency alternating current to 220V.

4. The battery charging and discharging method based on an integrated module according to claim 1, characterized in that: The first heat sink (8) and the second heat sink (11) both have a mounting plane, on which a copper connection layer is fixed, the lower surface of the first DBC ceramic substrate (9) is welded to the copper connection layer of the first heat sink (8), and the rectifier inverter circuit (1), the frequency conversion circuit (2) and the high-frequency inverter circuit (3) are all located on the upper surface of the first DBC ceramic substrate (9); the lower surface of the second DBC ceramic substrate (12) is welded to the copper connection layer of the second heat sink (11), and the high-frequency rectifier inverter circuit (4) is located on the upper surface of the second DBC ceramic substrate (12).

5. The battery charging and discharging method based on an integrated module according to claim 1, characterized in that: The side edges between the upper and lower surfaces of the first DBC ceramic substrate (9) are both wrapped by a first insulator (10).

6. The charging and discharging method of a battery based on an integrated module according to claim 1, characterized in that: The side edges between the upper and lower surfaces of the second DBC ceramic substrate (12) are both wrapped by the second insulator (13).

7. A battery charging and discharging method based on an integrated module according to claim 1, characterized in that: The length, width and height of the first integrated module (5) do not exceed 120*970*80 mm.

8. A battery charging and discharging method based on an integrated module according to claim 1, characterized in that: The length, width and height of the second integrated module (6) do not exceed 100*70*80 mm.

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