Charger, electric device and cooling method

Abstract

The application provides a charger including a charging circuit, a boosting circuit, a cooling liquid channel and a shell. The charging circuit, the boosting circuit and the cooling liquid channel are arranged in the shell. The boosting circuit is selectively electrically connected with the charging circuit. The charging circuit and the boosting circuit are different in height. The cooling liquid channel includes oppositely arranged first and second sides. The first side is a plane. The second side is attached to the charging circuit and the boosting circuit. The thickness of the cooling liquid channel changes with the height of the attached charging circuit and boosting circuit. The charging circuit is configured to be connected with an external power supply. When the input voltage is not greater than a predetermined voltage, the charging circuit and the boosting circuit are electrically connected. The external power supply is electrically connected with a battery through the charging circuit and the boosting circuit. The cooling liquid channel is configured to cool the charging circuit and the boosting circuit at the same time. The scheme saves arrangement space.

Description

Technical Field

[0001] This application relates to the field of thermal management technology, and more specifically, to chargers, electrical appliances and cooling methods. Background Technology

[0002] Currently, chargers suffer from problems such as slow heat dissipation, large size, and high cost. In the field of new energy vehicles, related charger solutions are bulky and inefficient in operation. Summary of the Invention

[0003] This application aims to at least solve one of the technical problems existing in the prior art. To this end, this application proposes a charger including a charging circuit, a boost circuit, a coolant channel, and a housing. The charging circuit, boost circuit, and coolant channel are arranged in the housing. The boost circuit and the charging circuit are selectively electrically connected. The charging circuit and the boost circuit have different heights. The coolant channel includes a first side and a second side arranged opposite to each other. The first side is planar, and the second side is attached to the charging circuit and the boost circuit. The thickness of the coolant channel varies with the height of the attached charging circuit and boost circuit. The charging circuit is configured to connect to an external power source and is configured to electrically connect to the boost circuit in response to an input voltage not exceeding a predetermined voltage. The external power source is electrically connected to the battery through the charging circuit and the boost circuit. The coolant channel is configured to simultaneously cool the charging circuit and the boost circuit. The charger can accommodate slow charging of no more than 60 kW, converting AC power from the grid into DC power suitable for charging electric vehicle batteries. In fast charging scenarios exceeding 60kW, when the input voltage is not greater than a predetermined voltage (e.g., not greater than 800V), the charging circuit boosts the voltage via a boost circuit. Both the boost circuit and the charging circuit generate heat during charging. The coolant channels can simultaneously cool both the charging circuit and the boost circuit. Adjusting the thickness of the coolant channels according to the height of the charging circuit and the boost circuit ensures that both circuits can dissipate heat and saves layout space.

[0004] On the other hand, this application proposes an electrical device including the aforementioned charger and a battery. The charger is connected to the battery and configured to connect to an external power source. The charger is configured to respond to an input voltage from the external power source that is not greater than a predetermined voltage. The external power source is electrically connected to the battery via a boost circuit for fast charging. With the development of new energy vehicles, customers demand increased driving range, leading to an increase in the number of battery cells and a rise in battery charging voltage. In practical applications, the battery voltage and the voltage of the external power source (such as a charging station) may not match. This mismatch can be solved by selectively connecting a boost circuit. An external enclosure is used, i.e., an additional housing is built for the boost inductor, which can achieve heat dissipation requirements. This application integrates the boost circuit and the slow charging circuit into a single housing, saving vehicle space, reducing costs, and eliminating the need for a separate mold. To achieve heat dissipation for the boost circuit, a cooling channel with a thickness varying with the height of the charging circuit and the boost circuit is provided. This separates the coolant flow into two parts: the thicker charging circuit cooling section dissipates heat from the components of the charging circuit, while the thinner boost circuit cooling section dissipates heat from the boost circuit itself. Electrical equipment can include controllers, vehicles, skateboard chassis, ships, drones, mobile phones, computers, air conditioners, refrigerators, washing machines, microwave ovens, printers, and fax machines.

[0005] In another aspect, this application provides a cooling method. In response to an input voltage not exceeding a predetermined voltage, the charging circuit and the boost circuit are electrically connected, and an external power source is electrically connected to the battery through the charging circuit and the boost circuit. The charging circuit and the boost circuit are arranged within a housing. In response to heat generated by the charging circuit and the boost circuit, the charging circuit and the boost circuit are cooled. With a constant power, by increasing the voltage and decreasing the current, heat loss is reduced, and the heat generation power of the boost circuit is also reduced. In this case, cooling the boost circuit can meet its heat dissipation requirements. Integrating fast charging and slow charging into one module offers several advantages: First, for the vehicle as a whole, the arrangement of the charging circuit is more flexible; it can be placed separately in the distribution box or integrated with the on-board charger, providing more options for vehicle layout. Second, integrating the boost circuit and the charging circuit within the on-board charger improves space utilization, with a single coolant channel achieving heat dissipation for both modules.

[0006] The terms “set up,” “equipped with,” “arranged,” “placed,” “attached,” “electrical connection,” and “closely attached” do not limit the form of contact or connection; they can be direct or indirect contact. The term “electrical connection” and its variations are intended to encompass both wireless conductive connections and conductive connections (wired connections) via one or more wires, cables, or conductors. The term “conductive connection” refers to a state or connection method in which a low-resistance current path is formed in a device or circuit, allowing current to flow smoothly; for example, the presence of current flowing between device A and device B can be considered a conductive connection.

[0007] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be learned from practice of the application, as described herein. Attached Figure Description

[0008] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the charger according to an embodiment of this application; Figure 2 This is a schematic diagram of a charging circuit according to an embodiment of this application; Figure 3 This is another structural schematic diagram of a charger according to an embodiment of this application; Figure 4 This is a structural perspective view of the coolant passage according to an embodiment of this application; Figure 5 This is yet another structural schematic diagram of a charger according to an embodiment of this application; Figure 6 This is a schematic diagram of the structure of an electrical device according to an embodiment of this application; Figure 7 This is an illustrative flowchart of a cooling method according to an embodiment of this application; and Figure 8 This is another illustrative flowchart of a cooling method according to an embodiment of this application. Detailed Implementation

[0009] The embodiments of this application are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of this application are described in detail below.

[0010] like Figure 1-4As shown, this application proposes a charger 100 including a charging circuit 1, a boost circuit 2, a coolant channel 3, and a housing 4. The charging circuit 1, the boost circuit 2, and the coolant channel 3 are arranged in the housing 4. The boost circuit 2 is selectively electrically connected to the charging circuit 1. The charging circuit 1 and the boost circuit 2 have different heights. The coolant channel 3 includes a first side 31 and a second side 32 arranged opposite to each other. The first side 31 is planar, and the second side 32 is attached to the charging circuit 1 and the boost circuit 2. The thickness T of the coolant channel 3 varies with the height of the attached charging circuit 1 and the boost circuit 2. The charging circuit 1 is configured to be connected to an external power source 5 and is configured to be electrically connected to the boost circuit 2 in response to an input voltage not exceeding a predetermined voltage. The external power source 5 is electrically connected to a battery 6 through the charging circuit 1 and the boost circuit 2. The coolant channel 3 is configured to simultaneously cool the charging circuit 1 and the boost circuit 2. Charger 100 can handle slow charging up to 60kW, converting AC power from the grid into DC power suitable for charging electric vehicle batteries. In fast charging scenarios exceeding 60kW, when the input voltage is not greater than a predetermined voltage (e.g., not greater than 800V), charging circuit 1 boosts the voltage via boost circuit 2. Both boost circuit 2 and charging circuit 1 generate heat during charging, and coolant channels 3 can simultaneously cool both circuits. The thickness T of coolant channels 3 is adjusted according to the height of charging circuit 1 and boost circuit 2 to ensure heat dissipation for both circuits and saves layout space.

[0011] refer to Figure 2 The charging circuit 1 is configured such that, in response to an input voltage greater than a predetermined voltage, its positive terminal is directly electrically connected to the positive terminal of the battery 6, and the external power supply 5 is electrically connected to the battery 6 through the charging circuit 1. Optionally, the predetermined voltage can be 800V. Optionally, the height of the boost circuit 2 is greater than the height of the charging circuit 1, and the coolant channel 3 has a boost circuit cooling section 33 and a charging circuit cooling section 34 that are in phase communication. The boost circuit cooling section 33 is attached to the boost circuit 2, and the charging circuit cooling section 34 is attached to the charging circuit 1 (see...). Figure 5The thickness of the boost circuit cooling section 33 is less than the thickness of the charging circuit cooling section 34. The boost circuit 2 can be a boost inductor. Switch KA5 is connected in parallel with the boost circuit 2. When the voltage is greater than 800V, switch KA8 is open and switch KA5 is open, allowing the current to directly charge the battery 6 without passing through the boost circuit 2. When the voltage is not greater than 800V, for example, 400V, switch KA8 is open and switch KA5 is open, allowing the current to be boosted by the boost circuit 2 before charging the battery 6. Therefore, external power supplies 5 of various voltages can charge the battery 6. In actual installation, the height of the boost circuit 2 may be higher than that of the charging circuit 1. The thickness of the boost circuit cooling section 33 being less than that of the charging circuit cooling section 34 can save installation space. When the boost circuit 2 is integrated with the slow charging circuit, the boost circuit 2 can dissipate heat through the boost circuit cooling section 33.

[0012] In this embodiment, the charging circuit 1 may further include a Hall effect device, a fuse FU2, and a capacitor C6. The external DC power input from the external power source 5 passes through the fuse FU2 and then the Hall effect device. If the external voltage matches the voltage of the battery 6, switch KA5 is turned on, switch KA8 is turned off, and current flows through KA5, directly charging the battery 6 without passing through the boost circuit 2. If the external voltage is lower and does not match the voltage of the battery 6, switch KA5 is turned off, switch KA8 is turned on, and current flows through the boost circuit 2, then charging the battery 6. The boost circuit 2 generates heat during operation. Thermal conductive gel is applied to the bottom of the boost circuit 2, which is in close contact with the boost circuit cooling section 33 for heat dissipation. The boost circuit cooling section 33 dissipates heat from the boost circuit 2. Through the boost circuit 2, the vehicle can be equipped with fast charging for various voltages. The boost circuit cooling section 33 is specifically designed to dissipate heat from the boost circuit 2. Furthermore, the flow rate of coolant flowing through the charging circuit cooling section 34 and the boost circuit cooling section 33 can be adjusted according to the power of the heat-generating components. If the temperature of the charging circuit 1 is high, the cross-sectional area of ​​the cooling section 33 of the boost circuit is reduced and the cross-sectional area of ​​the cooling section 34 of the charging circuit is increased, so that more coolant can flow through the charging circuit 1 to dissipate heat; if the temperature of the boost circuit 2 is high, the cross-sectional area of ​​the cooling section 33 of the boost circuit can also be increased and the cross-sectional area of ​​the cooling section 34 of the charging circuit can be decreased, so that more coolant can flow through the boost circuit 2.

[0013] In this embodiment, a bridge circuit composed of a group of MOSFETs converts AC to DC, which is then boosted by a transformer to match the output voltage of the on-board charger and charge the battery 6. A pressure plate on the pressure strip compresses and deforms the MOSFET to press it tightly against a ceramic pad. The ceramic pad is an insulator, isolating the voltage between the housing and the ceramic pad. Thermal grease is applied to the ceramic pad to transfer heat from the MOSFET to the ceramic pad, and then to the coolant channel 3. The transformer cavity is filled with potting compound. The potting compound penetrates into the transformer. Heat generated by transformer losses is transferred to the coolant channel 3 through the potting compound, thus dissipating heat. The MOSFET, as a plug-in, has leads at its head, which are soldered to the PCB board. A raised bump on the back of the pressure strip supports the housing, providing structural support. The pressure plate is made of stainless steel and is fixed to the support plate on the back of the pressure strip by welding. A MOSFET is arranged on one side of the pressure strip. The pressure strip and the MOSFET are in contact, creating an interference fit. The pressure strip compresses and deforms, generating a force on the MOSFET. A ceramic gasket is arranged on one side of the MOSFET, and a coolant channel 3 is arranged on one side of the ceramic gasket. A transformer is arranged on one side of the coolant channel 3. The charging circuit cooling section 34 has a large thickness, which can dissipate heat for the devices arranged on both sides of the charging circuit cooling section 34, increasing the heat dissipation area. It also dissipates heat for the MOSFET and the transformer, and the coolant flows in the middle, resulting in good heat dissipation. Therefore, the coolant channel 3 in this embodiment can dissipate heat for both the slow charging circuit and the fast charging boost circuit 2, achieving two functions with one coolant channel 3. At the same time, the charging circuit cooling section 34 and the boost circuit cooling section 33 are in the same cavity, increasing space utilization.

[0014] In some embodiments, the coolant passage 3 is in fluid communication with coolant outside the charger 100. By being in fluid communication with external coolant, the coolant passage 3 can exchange heat with external systems, such as connecting to the vehicle thermal management system.

[0015] refer to Figure 2 The charging circuit 1 is configured to connect with the boost circuit 2 in response to an input voltage not exceeding a predetermined voltage. The positive terminal of the external power supply 5 is connected to the positive terminal of the battery 6 through the charging circuit 1 and the boost circuit 2. When the battery voltage is low (e.g., not exceeding 800V) and the power is constant (e.g., greater than 60KW), the current causes heat loss. A separate cooling box can be added to house the boost circuit, and the boost circuit (e.g., a boost inductor) can be placed in the cooling box, which dissipates heat through coolant. In this embodiment, the boost circuit 2 is selectively connected to the charging circuit 1. The boost circuit 2 and the charging circuit 1 are integrated into the same housing 4. Under the condition of constant power, the charging voltage is increased. For example, the voltage can be twice that before connection, and the heat loss can be 1 / 4 of that before connection.

[0016] like Figure 2 and 6 As shown, this application proposes an electrical device 1000, including the aforementioned charger 100 and a battery 6. The charger 100 is connected to the battery 6 and configured to connect to an external power source 5. The charger 100 is configured to respond to an input voltage from the external power source 5 that is not greater than a predetermined voltage. The external power source 5 is electrically connected to the battery 6 via a boost circuit 2 to fast charge the battery 6. With the development of new energy vehicles, customers demand increased driving range, which increases the number of battery cells in the battery 6 and raises the charging voltage of the battery 6. The voltage of the battery 6 and the voltage of the external power source 5 (such as a charging pile) may not match. This mismatch problem can be solved by selectively connecting the boost circuit 2. An external mounting method is adopted, that is, an additional enclosure is made for the boost inductor, which can achieve the heat dissipation requirements. This application integrates the boost circuit 2 and the slow charging circuit into a housing 4, which can save vehicle space, reduce costs, and eliminate the need to develop a mold. In order to achieve heat dissipation of the boost circuit 2, a cooling channel 3 with a thickness T that varies with the height of the charging circuit 1 and the boost circuit 2 is provided. The cooling channel 3 divides the cooling flow into two parts: the thicker charging circuit cooling section 34 dissipates heat to the components of the charging circuit 1, and the thinner boost circuit cooling section 33 dissipates heat to the boost circuit 2.

[0017] Those skilled in the field can understand that various components can be added according to the needs of the vehicle, including components that require heat dissipation. The flow direction of the coolant channel 3 can be adjusted according to the actual placement of the components to achieve heat dissipation for each component.

[0018] like Figure 7 As shown, this application provides a cooling method 700. At 701, in response to the input voltage not exceeding a predetermined voltage, the charging circuit 1 and the boost circuit 2 are electrically connected, and the external power supply 5 is electrically connected to the battery 6 through the charging circuit 1 and the boost circuit 2. The charging circuit 1 and the boost circuit 2 are arranged in the housing 4. At 702, in response to the heat generated by the charging circuit 1 and the boost circuit 2, the charging circuit 1 and the boost circuit 2 are cooled. Under a certain power, by increasing the voltage and decreasing the current, heat loss is reduced, and the heat generation power of the boost circuit 2 is also reduced. In this case, cooling the boost circuit 2 can meet its heat dissipation requirements. Integrating fast charging and slow charging into one module has the following advantages: First, for the whole vehicle, the arrangement of the charging circuit 1 is more flexible. It can be placed separately in the distribution box or integrated with the on-board charger, giving the whole vehicle more options for layout; Second, integrating the boost circuit 2 and the charging circuit 1 into the on-board charger 100 can improve space utilization, and a single coolant channel 3 can achieve heat dissipation for both modules.

[0019] like Figure 8As shown, at point 801, in response to the input voltage exceeding a predetermined voltage, the positive terminal of charging circuit 1 is directly connected to the positive terminal of battery 6, and external power supply 5 is connected to battery 6 through charging circuit 1. At point 802, in response to the heat generated by charging circuit 1, charging circuit 1 is cooled. When the input voltage exceeds the predetermined voltage, the input voltage matches the voltage required by battery 6, and external power supply 5 is connected to battery 6 through charging circuit 1, at which time charging circuit 1 generates heat. Cooling charging circuit 1 can meet the heat dissipation requirements.

[0020] During layout, the positions of the fast charging connector and battery connector can be determined based on the wiring and connector positions of the vehicle. Hall effect sensors are placed at the front sampling point, and boost circuit 2 is positioned near the slow charging circuit to shorten the length of the coolant channel 3. Switch KA5 is connected in parallel with boost circuit 2. A switch KA8 is placed behind boost circuit 2. The current flow is as follows: external DC power flows through the fast charging connector to the inside of charger 100, and then the internal circuitry can transmit current via copper busbars. Hall effect sensors on the copper busbars collect the voltage and current of the input DC power using the Hall effect principle. The Hall effect sensors transmit the collected information to the sampling board via a low-voltage wiring harness, and the sampling board then makes a judgment to determine whether the input voltage matches the voltage of battery 6. The current passes through fuse FU2, which protects against excessive current and prevents component burnout. A capacitor C6 is connected in parallel with the input DC power. Capacitor C6 acts as a voltage regulator to prevent damage to the circuit due to unstable input voltage. The DC power then reaches switch KA5, and subsequent circuitry proceeds based on the result determined by the sampling board. If the external voltage matches that of battery 6, KA5 closes and KA8 opens, allowing DC power to bypass boost circuit 2 and directly fast charge battery 6. If the input DC power is determined to be mismatched with the voltage of battery 6, switch KA5 opens and switch KA8 closes, allowing the externally input DC power to be boosted by boost circuit 2 before charging battery 6 via K8.

[0021] In some embodiments, the aforementioned cooling method is applied at least to the aforementioned charger 100 or the aforementioned electrical device 1000.

[0022] As defined in this article, the terms “fast charging”, “rapid charging”, and “fast charging” refer to charging with a power of approximately greater than 60 kW, while the terms “slow charging”, “slow charging”, and “slow charging” refer to charging with a power of approximately less than or equal to 60 kW.

[0023] The term "responding to" indicates a response or a readily available reaction to an action or event. Therefore, if a second action is performed "in response to" a first action, a causal relationship exists between the occurrence of the first action and the occurrence of the second action. The term "responding to" indicates a causal relationship.

[0024] The term "in response to" can refer to a condition or action that occurs at least partially (if not entirely) as a result of a preceding condition or action. For example, a first condition or action may be performed and a second condition or action may occur at least partially as a result of a preceding condition or action (whether directly after the first condition or action or after one or more other intermediate conditions or actions that occur after the first condition or action). Similarly, the use of the term "in response to" to indicate either of its general meanings includes "at least in response to".

[0025] The term "configured as" is used to refer to arranging, putting together, manufacturing, promising for sale, importing, and / or designing a device, hardware, logic, or element to perform a specified or defined task. In this example, a device or element that is not currently operating is still "configured as" to perform the specified task if it is designed, coupled, and / or interconnected to perform the specified task. As an illustrative example only, a logic gate may provide 0 or 1 during operation. However, a logic gate is "configured as" to provide an enable signal to the clock, excluding every possible logic gate that can provide 1 or 0. Instead, a logic gate is a logic gate that is coupled in some way to enable the clock by outputting 1 or 0 during operation. Again, note that the use of the term "configured as" does not require operation but focuses on the potential state of a device, hardware, and / or element, where the potential state of the device, hardware, and / or element is designed to perform a specific task when the device, hardware, and / or element is operating.

[0026] The terms “length,” “width,” “height,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” and “thickness,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0027] In the description of this application, "first feature" and "second feature" may include one or more of the features. In the description of this application, "multiple" means two or more. In the description of this application, "above" or "below" the second feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. In the description of this application, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature.

[0028] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0029] 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.

[0030] Although the terms "first," "second," etc., are used repeatedly in this application to describe various elements (or various thresholds, or various applications, or various instructions, or various operations), these elements (or thresholds, applications, instructions, or operations) should not be limited by these terms. These terms are only used to distinguish one element (or threshold, application, instruction, or operation) from another element (or threshold, application, instruction, or operation). For example, a first operation can be referred to as a second operation, and a second operation can be referred to as a first operation, without departing from the scope of the invention. Both the first operation and the second operation are operations, but they are not the same operation.

[0031] The steps in the embodiments of this application are not necessarily processed in the order described. The steps can be rearranged, deleted, or added as needed. The step descriptions in the embodiments of this application are only optional combinations of sequences and do not represent all possible combinations of steps in the embodiments of this application. The order of steps in the embodiments should not be considered as a limitation of this application.

[0032] In the embodiments of this application, the terms "and / or" and "including at least one" refer to any and all possible combinations of one or more of the associated listed items. It should also be noted that, when used in this specification, "including / comprising" specifies the presence of the stated features, integers, steps, operations, parts, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, parts, elements, and / or components and / or groups thereof.

[0033] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

[0034] List of reference numerals Charger 100 Charging circuit 1 Boost circuit 2 Coolant channel 3 First side 31 Second side 32 Boost circuit cooling section 33 Charging circuit cooling section 34 4 housings External power supply 5 Battery 6 1000 electrical devices.

Claims

1. A charger (100), characterized in that, include: Charging circuit (1), boost circuit (2), coolant channel (3), and housing (4). The charging circuit (1), the boost circuit (2), and the coolant channel (3) are arranged in the housing (4). The boost circuit (2) is selectively electrically connected to the charging circuit (1). The charging circuit (1) and the boost circuit (2) have different heights. The coolant channel (3) includes a first side (31) and a second side (32) arranged opposite to each other. The first side (31) is planar, and the second side (32) is attached to the charging circuit (1) and the boost circuit (2). The thickness of (3) varies with the height of the attached charging circuit (1) and the boost circuit (2). The charging circuit (1) is configured to be connected to an external power source (5) and is configured to be electrically connected to the boost circuit (2) in response to an input voltage not exceeding a predetermined voltage. The external power source (5) is electrically connected to the battery (6) through the charging circuit (1) and the boost circuit (2). The cooling channel (3) is configured to simultaneously cool the charging circuit (1) and the boost circuit (2).

2. The charger (100) according to claim 1, characterized in that, The charging circuit (1) is configured such that, in response to the input voltage being greater than a predetermined voltage, the positive terminal of the charging circuit (1) is directly electrically connected to the positive terminal of the battery (6), and the external power supply (5) is electrically connected to the battery (6) through the charging circuit (1).

3. The charger (100) according to claim 1 or 2, characterized in that, The predetermined voltage is 800V.

4. The charger (100) according to claim 1, characterized in that, The height of the boost circuit (2) is greater than the height of the charging circuit (1). The coolant channel (3) has a boost circuit cooling section (33) and a charging circuit cooling section (34) that are in phase communication. The boost circuit cooling section (33) is attached to the boost circuit (2), and the charging circuit cooling section (34) is attached to the charging circuit (1). The thickness of the boost circuit cooling section (33) is less than the thickness of the charging circuit cooling section (34).

5. The charger (100) according to claim 1 or 4, characterized in that, The coolant channel (3) is in fluid communication with the coolant outside the charger (100).

6. The charger (100) according to claim 1, characterized in that, The charging circuit (1) is configured to be electrically connected to the boost circuit (2) in response to an input voltage not exceeding a predetermined voltage, and the positive terminal of the external power supply (5) is electrically connected to the positive terminal of the battery (6) through the charging circuit (1) and the boost circuit (2).

7. An electrical appliance (1000), characterized in that, The device includes a charger (100) according to any one of claims 1-6; and the battery (6), wherein the charger (100) is connected to the battery (6) and configured to be connected to the external power source (5), and the charger (100) is configured to fast charge the battery (6) in response to a voltage input from the external power source (5) not exceeding a predetermined voltage, wherein the external power source (5) is electrically connected to the battery (6) via a boost circuit (2).

8. A cooling method, characterized in that, include: In response to an input voltage not exceeding a predetermined voltage, the charging circuit (1) and the boost circuit (2) are electrically connected, and the external power supply (5) is electrically connected to the battery (6) through the charging circuit (1) and the boost circuit (2); and In response to the heat generated by the charging circuit (1) and the boost circuit (2), the charging circuit (1) and the boost circuit (2) are cooled. The charging circuit (1) and the boost circuit (2) are arranged in the housing (4).

9. The cooling method as described in claim 8, characterized in that, In response to the input voltage being greater than a predetermined voltage, the positive terminal of the charging circuit (1) is directly connected to the positive terminal of the battery (6), and the external power supply (5) is connected to the battery (6) through the charging circuit (1). In response to the heat generated by the charging circuit (1), the charging circuit (1) is cooled.

10. The cooling method as described in claim 8 or 9, characterized in that, It is applied at least to the charger (100) as described in any one of claims 1-6 or the electrical appliance (1000) as described in claim 7.

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