Wireless power transmission system of terminal-free battery pack

Abstract

The invention provides a wireless power transmission system of a terminal-free battery pack. The wireless power transmission system comprises the terminal-free battery pack, a switching transformer, a wireless loader and a wireless charger. The terminal-free battery pack is a battery pack without a metal connector (or a metal terminal) and comprises a battery and a bidirectional switcher. The switching transformer comprises a first magnetic core wire set and a second magnetic core wire set which are arranged in a separated mode, the first magnetic core wire set is arranged on the terminal-free battery pack, and the second magnetic core wire set is arranged on the wireless loader and the wireless charger. When the terminal-free battery pack is close to the wireless load device, the bidirectional switcher serves as a driver, the first magnetic core wire set and the second magnetic core wire set generate electromagnetic coupling, and the battery supplies electric energy to the wireless load device through the driver and the switching transformer. When the terminal-free battery pack is close to the wireless charger, the bidirectional switcher serves as a rectifier, the first magnetic core wire set and the second magnetic core wire set generate electromagnetic coupling, and the battery receives electric energy from the wireless charger through the switching transformer and the rectifier.

Description

Technical Field

[0001] This application relates to the field of power transmission technology, and in particular to a wireless power transmission system for terminalless battery packs. Background Technology

[0002] With the continuous development of electric vehicles, energy walls, and energy stations, the demand for batteries is gradually increasing, and high-power DC power supply systems are becoming indispensable. In high-power DC power supply systems, high-current wired connections are typically implemented through mechanical contact, which presents problems of low reliability and high safety risks.

[0003] For plug-in charging, taking electric vehicle charging guns as an example, there is a tolerance between the diameter of the charging gun's socket and the diameter of the charging socket's pins. This tolerance affects the contact resistance between the socket and the socket. Specifically, if the socket diameter is too large or the pin diameter is too small, the socket and socket cannot make complete contact, thus increasing the contact resistance. When current flows through the socket and socket, the temperature of the contact surfaces rises. This increased temperature promotes the formation of an oxide film on the contact surfaces, further increasing the contact resistance; ultimately, the charging gun malfunctions.

[0004] If the diameter of the socket is too small or the diameter of the pins is too large, the pins will wear out significantly when the charging gun is plugged in and out, eventually leading to poor contact between the socket and the outlet, thus increasing contact resistance. Furthermore, due to the wide variety of electric vehicle brands and socket types, the contact between different types of sockets and outlets will not be complete, further increasing contact resistance.

[0005] For non-pluggable electrical contacts secured by other fasteners, when direct current passes through them, an oxide film forms on the contact surface due to electrochemical effects, increasing contact resistance. Especially in high-temperature and high-humidity environments, this causes the non-pluggable contacts to heat up, leading to increased conductivity loss and even burnout. Furthermore, electrical contacts with metal connectors or terminals increase safety risks in environments with flammable gases, dust, or underwater. Summary of the Invention

[0006] Based on the foregoing, this application provides a wireless power transmission system for terminalless battery packs to solve the problems of low reliability and high safety risks caused by metal connectors or connection terminals.

[0007] Based on the foregoing, this application provides a wireless power transmission system for a terminalless battery pack, including a switching transformer, a terminalless battery pack, a wireless load, and a wireless charger. The switching transformer includes a first magnetic core wire group and a second magnetic core wire group, which are separately disposed. When the first and second magnetic core wire groups are close together, they generate electromagnetic coupling; when they are far apart, they do not generate electromagnetic coupling. The terminalless battery pack includes a battery and a bidirectional switcher. The battery is electrically connected to the bidirectional switcher. The first magnetic core wire group of the switching transformer is disposed on the terminalless battery pack, and the bidirectional switcher is electrically connected to the first magnetic core wire group. The second magnetic core wire group of the switching transformer is disposed on the wireless load and the wireless charger, respectively. When the terminalless battery pack is close to the wireless load, the terminalless battery pack is in a power-on state. The bidirectional switcher acts as a driver, and the first and second magnetic core wire groups are in a closed state and generate electromagnetic coupling. The battery provides first electrical energy to the wireless load through the driver and the switching transformer. When the terminalless battery pack is near the wireless charger, the terminalless battery pack is in a charging state. The bidirectional switch acts as a rectifier, and the first and second magnetic core wire groups are in a closed state and generate electromagnetic coupling. The battery receives second electrical energy from the wireless charger through the switching transformer and rectifier.

[0008] Based on the foregoing, this application provides a wireless power transmission system for a terminalless battery pack, including a first switching transformer, a second switching transformer, a terminalless battery pack, a wireless load, and a wireless charger. The first switching transformer includes a first magnetic core wire group and a third magnetic core wire group, which are separately disposed. The first magnetic core wire group is the primary terminal of the first switching transformer, and the third magnetic core wire group is the secondary terminal. When the first and third magnetic core wire groups are close together, electromagnetic coupling occurs; when they are far apart, there is no electromagnetic coupling. The second switching transformer includes a second magnetic core wire group and a fourth magnetic core wire group, which are separately disposed. The second magnetic core wire group is the secondary terminal of the second switching transformer, and the fourth magnetic core wire group is the primary terminal. When the second and fourth magnetic core wire groups are close together, they generate electromagnetic coupling; when they are far apart, they do not generate electromagnetic coupling. The terminalless battery pack includes a battery, a rectifier, and a driver. The battery is electrically connected to the rectifier and the driver. The first magnetic core wire group of the first switching transformer and the second magnetic core wire group of the second switching transformer are disposed in the terminalless battery pack. The first magnetic core wire group is electrically connected to the driver, and the second magnetic core wire group is electrically connected to the rectifier. The third magnetic core wire group of the first switching transformer is disposed in the wireless load device. The fourth magnetic core wire group of the second switching transformer is disposed in the wireless charger. When the terminalless battery pack is near the wireless load, it is in a power supply state. The first and third magnetic core wire groups are closed and electromagnetically coupled. The battery provides first electrical energy to the wireless load through the driver and the first switching transformer. When the terminalless battery pack is near the wireless charger, it is in a charging state. The second and fourth magnetic core wire groups are closed and electromagnetically coupled. The battery receives second electrical energy from the wireless charger through the second switching transformer and the rectifier.

[0009] In summary, the wireless power transmission system for the terminalless battery pack of this application forms a transformer through the configuration of two magnetic core wire groups. The configuration of the transformer enables the charging and power supply of the terminalless battery pack to be achieved through wireless transmission, without the need for metal connectors or connection terminals, thereby improving reliability and reducing safety risks.

[0010] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, the following describes the application in detail with reference to the preferred embodiments and accompanying drawings. Attached Figure Description

[0011] Figure 1A configuration diagram of a wireless power transmission system for a terminalless battery pack is shown according to an embodiment of this application.

[0012] Figure 2A This is a schematic diagram illustrating a wireless power transmission system for a terminalless battery pack in a powered state, according to an embodiment of this application.

[0013] Figure 2B This is a schematic diagram illustrating a wireless power transmission system for a terminalless battery pack in a charging state, according to an embodiment of this application.

[0014] Figure 3 A configuration diagram of a bidirectional switcher according to an embodiment of this application is shown.

[0015] Figure 4 A configuration diagram of a bidirectional switcher is shown according to another embodiment of this application.

[0016] Figure 5 A configuration diagram of a terminalless battery pack is shown according to an embodiment of this application.

[0017] Figure 6 A configuration diagram of diodes, capacitors, and voltage regulators is shown according to an embodiment of this application.

[0018] Figure 7 A configuration diagram of a wireless power transmission system for a terminalless battery pack is shown according to another embodiment of this application.

[0019] Figure 8 This is a schematic diagram illustrating the wireless power transmission system of the terminalless battery pack in a power supply state and a charging state according to another embodiment of this application.

[0020] Figure 9 A configuration diagram of a terminalless battery pack is shown according to another embodiment of this application.

[0021] Figure 10 A configuration diagram of a wireless loader is shown according to an embodiment of this application.

[0022] Figure 11 A configuration diagram of a wireless charger is shown according to an embodiment of this application.

[0023] Figure 12 A configuration diagram of an AC-DC converter in a wireless charger is shown according to an embodiment of this application.

[0024] Figure 13A This is a schematic diagram illustrating a plurality of first magnetic cores connected in series according to an embodiment of the present application.

[0025] Figure 13B This is a schematic diagram illustrating a plurality of first magnetic cores connected in parallel according to an embodiment of the present application.

[0026] Figure 14A A structural diagram of the first magnetic core is shown according to an embodiment of this application.

[0027] Figure 14B A structural diagram of the first magnetic core is shown according to another embodiment of this application.

[0028] Figure 14C A structural diagram of the first magnetic core is shown according to another embodiment of this application.

[0029] Figure 15 A schematic diagram of a shield-shaped shield is shown according to an embodiment of this application.

[0030] In the attached figures, the following labels are used:

[0031] 1, 2: Wireless power transmission system for terminalless battery packs

[0032] 1A, 2A: Terminalless battery pack

[0033] 1B, 2B: Wireless Loaders

[0034] 1C, 2C: Wireless charger

[0035] 10: Battery

[0036] 20: Bidirectional switch

[0037] 20A, 2C-30: Driver

[0038] 20B, 2B-10: Rectifier

[0039] 30A, 31A: The first magnetic core group of the switching transformer

[0040] 30B, 31B: Second core wire group of switching transformer

[0041] 31C: The third magnetic core group of the switching transformer

[0042] 31D: The fourth core wire group of the switching transformer

[0043] 40, 2B-30, 2C-40: Controller

[0044] 50: Voltage-controlled oscillator

[0045] 60: Temperature sensor

[0046] 70: Temperature regulator

[0047] 80, 2B-20, 2C-20: Current sensors

[0048] 90: Voltage Sampler

[0049] 100, D1~D4: Diodes

[0050] 110: Capacitor

[0051] 120: Voltage Regulator

[0052] 130: Trigger

[0053] 140, 2B-40, 2C-70: Communicators

[0054] 2B-50: Discharge Start Signal

[0055] 2C-10: AC-DC Converter

[0056] 2C-50: Oscillator

[0057] 2C-60: Charging Start Signal

[0058] AC1: AC power supply

[0059] a, b: Terminals of the first magnetic core group of the switching transformer

[0060] B1: Base Plate

[0061] BC1, BC2: Bypass circuits

[0062] c, d: Points

[0063] C1: Charger

[0064] D5, D6: Zener diodes

[0065] inv1, inv2: Digital inverters

[0066] L: Transformer coil

[0067] L1: Load element

[0068] RD1: Magnetic column

[0069] R1~R4: Resistors

[0070] S1~S4, S11~S14: Switches

[0071] SW1: Sidewall

[0072] SL1: Cable routing channel

[0073] SC1: Cover-shaped shield

[0074] SP1: Shielding plate

[0075] tr1, tr2: Output signals

[0076] Vcc: Voltage at one end of the diode Detailed Implementation

[0077] The following specific embodiments illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification.

[0078] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present application will now be described in detail with reference to the accompanying drawings and embodiments. To enable those skilled in the art to better understand the solutions of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application.

[0079] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products, or devices.

[0080] Please see Figure 1 This is a configuration diagram illustrating a wireless power transmission system for a terminalless battery pack according to an embodiment of this application. Figure 1As shown, the wireless power transmission system 1 for terminalless battery packs includes a switching transformer, a terminalless battery pack 1A, a wireless load device 1B, and a wireless charger 1C. The switching transformer includes a first magnetic core wire group 30A and a second magnetic core wire group 30B, which are separately disposed. The first magnetic core wire group 30A is disposed on the terminalless battery pack 1A, and the second magnetic core wire group 30B is disposed on both the wireless load device 1B and the wireless charger 1C. When the first magnetic core wire group 30A and the second magnetic core wire group 30B are close together and in a closed state, electromagnetic coupling occurs; when they are far apart and in a separated state, there is no electromagnetic coupling. In this embodiment, the terminalless battery pack 1A is a portable terminalless battery pack; it should be noted that a terminalless battery pack is a battery pack without metal connectors or metal terminals, and it transmits (powers) and receives (charges) power wirelessly, thus avoiding the problem of poor contact between adjacent metal contacts. The terminalless battery pack 1A includes a battery 10 and a bidirectional switch 20. The battery 10 is electrically connected to the bidirectional switch 20 and can be a commercially available battery pack or battery. The battery 10 switches between power supply and charging states of the terminalless battery pack 1A, functioning as either a power source or an energy storage device. The bidirectional switch 20 is electrically connected to a first magnetic core wire group 30A; in other words, the bidirectional switch 20 is located between the first magnetic core wire group 30A and the battery 10. The bidirectional switch 20 switches between driver and rectifier functions based on the power supply and charging states of the terminalless battery pack 1A.

[0081] The first magnetic core assembly 30A includes a first magnetic core with a finished coil winding. The first magnetic core may be, for example, but not limited to, a can-shaped core, an E-shaped core, or a semi-toroidal core. The material of the first magnetic core may be, but is not limited to, ferrite. The coil of the first magnetic core assembly 30A may be made of single-strand enameled wire or multi-strand enameled wire. The number of the first magnetic core assemblies 30A can be adjusted to one or more assemblies according to the requirements of the wireless power transmission system 1 for the terminalless battery pack. The number of first magnetic cores may be one or more; there is no limitation on the number of the first magnetic core assemblies 30A or the number of first magnetic cores. The second magnetic core assembly 30B includes a second magnetic core with a finished coil winding. The coil type of the first magnetic core assembly 30A is the same as the coil type of the second magnetic core assembly 30B. The number of the second magnetic core wire group 30B can be adjusted to one or more groups according to the needs of the wireless power transmission system 1 for the terminalless battery pack. The number of the second magnetic cores can be one or more, and there is no limitation on the number of the second magnetic core wire group 30B and the number of the second magnetic cores.

[0082] When the first magnetic core wire group 30A approaches the second magnetic core wire group 30B of the wireless load device 1B or the second magnetic core wire group 30B of the wireless charger 1C, the first magnetic core wire group 30A and the second magnetic core wire group 30B of the wireless load device 1B or the second magnetic core wire group 30B of the wireless charger 1C form a switchable transformer. Since the magnetic cores of the two magnetic core wire groups of the switchable transformer are not integrally formed but are two separate cores, the first magnetic core wire group 30A can be separated without being fixedly connected to the second magnetic core wire group 30B of the wireless load device 1B, and the first magnetic core wire group 30A can be separated without being fixedly connected to the second magnetic core wire group 30B of the wireless charger 1C. In other words, the first magnetic core wire group 30A and the second magnetic core wire group 30B are separately configured. In use, the first magnetic core wire group 30A is placed close to the second magnetic core wire group 30B of the wireless load device 1B or the second magnetic core wire group 30B of the wireless charger 1C for power supply or discharge; therefore, the switching transformer is an important component in wireless power supply and wireless charging, and it is very flexible and adaptable in use. One first magnetic core wire group 30A can be combined with multiple second magnetic core wire groups 30B to form a switching transformer; or, one second magnetic core wire group 30B can be combined with multiple first magnetic core wire groups 30A to form a switching transformer.

[0083] The terminalless battery pack 1A switches between a power supply state and a charging state depending on the wireless load and wireless charger, to supply power to the wireless load or receive power from the wireless charger. The operating mechanism of the terminalless battery pack 1A supplying power to the wireless load and receiving power from the wireless charger is detailed below.

[0084] Please see Figure 2A and Figure 2B These are schematic diagrams illustrating a wireless power transmission system for a terminalless battery pack in a power-on state, and a schematic diagram illustrating a wireless power transmission system for a terminalless battery pack in a charging state, according to an embodiment of this application. Figure 2AAs shown, the second magnetic core wire group 30B is disposed on the wireless load device 1B, which includes a load element L1. When the terminalless battery pack 1A approaches the wireless load device 1B, the terminalless battery pack 1A switches to a power supply state, the battery 10 is regarded as the power source, the bidirectional switch 20 acts as the driver, and the first magnetic core wire group 30A and the second magnetic core wire group 30B are in a closed state, forming a switching transformer. The first magnetic core wire group 30A belongs to the primary end of the switching transformer and serves as the primary magnetic core wire group, while the second magnetic core wire group 30B belongs to the secondary end of the switching transformer and serves as the secondary magnetic core wire group. Through the electromagnetic coupling of the primary and secondary magnetic core wire groups, a magnetic flux loop is formed between the first magnetic core of the first magnetic core wire group 30A and the second magnetic core of the second magnetic core wire group 30B. The battery 10 transmits the first electrical energy to the load element L1 through the driver and the magnetic flux loop, that is, the battery 10 provides the first electrical energy to the wireless load device 1B through the driver and the switching transformer. When the terminalless battery pack 1A is not close to the wireless load device 1B, the first magnetic core wire group 30A and the second magnetic core wire group 30B are in a separate state, the primary magnetic core wire group is not coupled to the secondary magnetic core wire group, and the terminalless battery pack 1A does not perform the power supply function.

[0085] like Figure 2B As shown, the second magnetic core wire group 30B is disposed in the wireless charger 1C, which includes a charger C1. When the terminalless battery pack 1A is close to the wireless charger 1C, the terminalless battery pack 1A switches to a charging state, the battery 10 is regarded as an energy storage device, the bidirectional switch 20 is regarded as a rectifier, the first magnetic core wire group 30A and the second magnetic core wire group 30B are in a closed state and form a switching transformer. The first magnetic core wire group 30A belongs to the secondary end of the switching transformer and serves as the secondary magnetic core wire group, and the second magnetic core wire group 30B belongs to the primary end of the switching transformer and serves as the primary magnetic core wire group. Through the electromagnetic coupling of the primary and secondary magnetic core wire groups, a magnetic flux loop is formed between the first magnetic core of the first magnetic core wire group 30A and the second magnetic core of the second magnetic core wire group 30B. The battery 10 receives second electrical energy from the charger C1 through the rectifier and the magnetic flux loop, that is, the battery 10 receives second electrical energy from the wireless charger 1C through the rectifier and the switching transformer. When the terminalless battery pack 1A is not near the wireless charger 1C, the first magnetic core wire group 30A and the second magnetic core wire group 30B are separated, the primary magnetic core wire group is not coupled to the secondary magnetic core wire group, and the terminalless battery pack 1A does not perform the charging function.

[0086] In the wireless power transmission system of the terminalless battery pack of this embodiment, when the terminalless battery pack is in a power-on state, the first magnetic core wire group belongs to the primary terminal of the switching transformer, and the terminalless battery pack acts as a charging device to supply power to the wireless load. When the terminalless battery pack is in a charging state, the first magnetic core wire group belongs to the secondary terminal of the switching transformer, and the terminalless battery pack acts as a receiving device to receive electrical energy from the wireless charger. As described above, the first magnetic core wire group of the terminalless battery pack has the functions of both a primary and secondary magnetic core wire group, and can switch between the primary and secondary magnetic core wire groups according to the power-on and charging states. In other words, the terminalless battery pack has the functions of both the primary and secondary sides of the switching transformer, and can perform charging and power supply functions, but cannot perform both simultaneously. Therefore, the terminalless battery pack can switch between the primary and secondary sides of the switching transformer as a receiving device or a power supply device depending on the power-on and charging states.

[0087] In this embodiment of the terminalless battery pack, since there is no need to loosen or tighten the connectors or metal terminals of the mechanical mechanism, when a terminalless battery pack with insufficient power needs to be replaced, workers can quickly replace it with a pre-charged new terminalless battery pack without disassembling screws and metal connectors, thus saving workers the time of repeatedly disassembling and reassembling all screws and metal connectors. When the wireless power transmission system of this embodiment of the terminalless battery pack is applied to a battery swapping station that replaces a charging station, the energy replenishment speed of electric vehicles is faster than the refueling speed of traditional gasoline vehicles. This embodiment of the wireless power transmission system of the terminalless battery pack will bring a revolutionary change to the rapid energy replenishment of electric vehicles. In addition, another revolutionary change brought by the wireless power transmission system of this embodiment of the terminalless battery pack to the battery swapping station is that, since there is no traditional charging socket and charging outlet configuration, there is also no problem of poor contact between the socket and outlet. The terminalless battery pack (equivalent to a traditional battery) belongs to the battery swapping station itself rather than the electric vehicle itself, which significantly reduces the price of electric vehicles and improves their reliability.

[0088] The following text will be based on Figure 1 The battery 10 and the first magnetic core wire group 30A shown illustrate the configuration of the bidirectional switcher 20. Please refer to further details. Figure 3 This is a configuration diagram of a bidirectional switch according to an embodiment of this application. Figure 3As shown, the bidirectional switch 20 includes switches S1 to S4 and diodes D1 to D4. When the bidirectional switch 20 functions as a driver, switches S1 to S4 form a full-bridge driver, while diodes D1 to D4 are reverse-biased and open. However, the bidirectional switch 20 can also be a half-bridge driver or other types of drivers, and is not limited to these. When the bidirectional switch 20 functions as a rectifier, switches S1 to S4 and diodes D1 to D4 form a full-bridge rectifier. However, the bidirectional switch 20 can also be a half-bridge rectifier or other types of rectifiers, and is not limited to these.

[0089] Please refer to the following: Figure 2A and Figure 2B .like Figure 2A and Figure 3 As shown, when the terminalless battery pack 1A is powered, the first magnetic core wire group 30A serves as the primary magnetic core wire group of the switching transformer. First, switches S1 and S4 are turned on, while switches S2 and S3 are turned off. The current supplied by the battery 10 flows through switch S1 into one end a of the first magnetic core wire group 30A and out from the other end b, passing through switch S4. Next, switches S1 and S4 are turned off, while switches S2 and S3 are turned on. The current supplied by the battery 10 flows through switch S3 into the other end b of the first magnetic core wire group 30A and out from one end a, passing through switch S2. By alternately switching on switches S1 and S4, and switches S2 and S3, the first magnetic core wire group 30A generates a pulsed magnetic field due to the current from the battery 10. The pulsed magnetic field is guided through the first magnetic core of the first magnetic core wire group 30A and the second magnetic core of the second magnetic core wire group 30B to form a magnetic flux loop in the first and second magnetic cores. The first electrical energy of the battery 10 is transmitted to the load element L1 through the magnetic flux loop. The advantages of the aforementioned full-bridge drive mode are as follows: (1) The peak voltage of the first magnetic core wire group 30A is twice the voltage of the battery 10. (2) The average current of the first magnetic core wire group 30A is zero, and the non-zero average current will not cause problems such as asymmetry in the magnetic core characteristics of the first magnetic core wire group 30A.

[0090] like Figure 2B and Figure 3As shown, when the terminalless battery pack 1A is in the charging state, the first magnetic core wire group 30A serves as the secondary magnetic core wire group of the switching transformer. With all switches S1-S4 open, the second magnetic core of the second magnetic core wire group 30B generates a pulsed magnetic field due to the current supplied by the charger C1. This pulsed magnetic field is guided through the first magnetic core of the first magnetic core wire group 30A and the second magnetic core of the second magnetic core wire group 30B to form a magnetic flux loop. This magnetic flux loop transmits the second electrical energy from the charger C1 to the first magnetic core wire group 30A, generating an AC voltage across its terminals. Diodes D1-D4 rectify this AC voltage into a DC voltage to charge the battery 10. Furthermore, to reduce the voltage drop of diodes D1-D4 and improve their rectification efficiency, low forward voltage Schottky diodes can be selected for diodes D1-D4.

[0091] Please see Figure 4 This is a configuration diagram of a bidirectional switch according to another embodiment of this application. Figure 4 As shown, the bidirectional switch 20 includes switches S1-S4, diodes D1-D4, and bypass circuits BC1 and BC2. The configuration of switches S1-S4 and diodes D1-D4 is similar to... Figure 3 The configuration shown is similar and will not be repeated here. When the voltage at terminal a of the first magnetic core wire group 30A is higher than the voltage at terminal b of the first magnetic core wire group 30A, diodes D1 and D4 conduct; simultaneously, the output signal tr2 of bypass circuit BC2 is at a high level, which turns on switches S1 and S4. Similarly, when the voltage at terminal b of the first magnetic core wire group 30A is higher than the voltage at terminal a of the first magnetic core wire group 30A, diodes D2 and D3 conduct; simultaneously, the output signal tr1 of bypass circuit BC1 is at a high level, and the output signal tr2 of bypass circuit BC2 is at a low level, which turns on switches S2 and S3. Thus, the simultaneous parallel conduction of diodes and switches reduces the voltage drop across the rectifier and improves the rectification efficiency. In other words, bypass circuits BC1 and BC2 assist the bidirectional switch 20 in voltage regulation.

[0092] The bypass circuit BC1 includes resistors R1 and R2, a Zener diode D5, and a digital inverter inv1. Since the voltage of battery 10 is higher than the operating voltage of the digital logic elements (e.g., the digital inverter inv1), resistors R1 and R2 act as voltage dividers in the bypass circuit BC1 to reduce the power consumption of the bidirectional switch 20. The Zener diode D5 (e.g., a Zener diode) maintains a constant voltage output for the bypass circuit BC1. When the voltage at one end a of the first magnetic core wire group 30A reaches its highest value, resistors R1 and R2 divide the voltage at end a of the first magnetic core wire group 30A, generating a first voltage division at point c; even when the voltage at end a of the first magnetic core wire group 30A reaches its highest value, the first voltage division remains within the operating voltage range of the digital inverter inv1. When the voltage at the other end b of the first magnetic core wire group 30A is greater than the voltage at one end a of the first magnetic core wire group 30A, diodes D2 and D3 are turned on, switches S2 and S3 are turned on, diodes D1 and D4 are turned off, switches S1 and S4 are turned off, and digital inverter inv1 generates output signal tr1 according to the first voltage divider.

[0093] The bypass circuit BC2 includes resistors R3 and R4, a Zener diode D6, and a digital inverter inv2. Since the voltage of battery 10 is higher than the operating voltage of the digital logic elements (e.g., the digital inverter inv2), resistors R3 and R4 act as voltage dividers in the bypass circuit BC2 to reduce the power consumption of the bidirectional switch 20. The Zener diode D6 (e.g., a Zener diode) maintains a constant voltage output for the bypass circuit BC2. Resistors R3 and R4 divide the voltage at one end b of the first magnetic core wire group 30A and generate a second voltage division at point d; even if the voltage at the other end b of the first magnetic core wire group 30A reaches its highest value, the second voltage division remains within the operating voltage range of the digital inverter inv2. When the voltage at one end a of the first magnetic core wire group 30A is greater than the voltage at the other end b of the first magnetic core wire group 30A, diodes D1 and D4 are turned on, switches S1 and S4 are turned on, diodes D2 and D3 are turned off, switches S2 and S3 are turned off, and digital inverter inv2 generates output signal tr2 according to the second voltage divider.

[0094] The configuration of the terminalless battery pack 1A will be further described below. Please refer to [link / reference]. Figure 5 This is a configuration diagram of a terminalless battery pack according to an embodiment of this application. Figure 5 As shown, the terminalless battery pack 1A includes a battery 10, a bidirectional switch 20, a first magnetic core wire group 30A, a controller 40, a voltage-controlled oscillator 50, a temperature sensor 60, a temperature regulator 70, a current sensor 80, a voltage sampler 90, a diode 100, a capacitor 110, a voltage regulator 120, a trigger 130, and a communicator 140. The configuration of the battery 10, the bidirectional switch 20, and the first magnetic core wire group 30A is... Figure 1The configurations shown are similar and will not be described again here.

[0095] Controller 40 is electrically connected to voltage-controlled oscillator 50, and voltage-controlled oscillator 50 is electrically connected to bidirectional switch 20. Controller 40 transmits control signals to voltage-controlled oscillator 50, and voltage-controlled oscillator 50 outputs operating signals to bidirectional switch 20 according to the control signals. Bidirectional switch 20 operates according to the operating signals; in other words, voltage-controlled oscillator 50 is controlled by controller 40 to output operating signals with operating frequencies to bidirectional switch 20, and bidirectional switch 20 operates according to the operating frequency of the operating signals. The operating frequency of bidirectional switch 20 can be low frequency, medium frequency, or high frequency. Furthermore, in order to reduce the size of the first magnetic core wire assembly 30A, the operating frequency of bidirectional switch 20 is usually set to high frequency.

[0096] Please refer to the following: Figure 1 When the coupling state between the first magnetic core wire group 30A and the second magnetic core wire group 30B of the wireless load device 1B or the second magnetic core wire group 30B of the wireless charger 1C is strong coupling, that is, when the contact between the terminalless battery pack 1A and the wireless load device 1B or the contact between the terminalless battery pack 1A and the wireless charger 1C is direct contact, the controller 40 controls the voltage-controlled oscillator 50 to adjust the operating frequency so that the efficiency of the terminalless battery pack 1A reaches the highest efficiency or the power of the terminalless battery pack 1A reaches the peak power. When the coupling state of the first magnetic core wire group 30A and the second magnetic core wire group 30B is weak coupling, that is, the contact between the terminalless battery pack 1A and the wireless load 1B or the contact between the terminalless battery pack 1A and the wireless charger 1C is a spaced contact, and there is a gap (e.g., 30cm) between the terminalless battery pack 1A and the wireless load 1B or between the terminalless battery pack 1A and the wireless charger 1C, the controller 40 controls the voltage-controlled oscillator 50 to adjust the operating frequency so that the terminalless battery pack 1A is maintained in a resonant state. In other words, the controller 40 controls the voltage-controlled oscillator 50 to adjust the operating signal according to the coupling state of the first magnetic core wire group 30A and the second magnetic core wire group 30B.

[0097] Temperature sensor 60 and temperature regulator 70 are electrically connected to controller 40, and temperature regulator 70 is electrically connected to battery 10. Temperature sensor 60 detects and transmits the temperature value of battery 10 to controller 40. Controller 40 selectively activates temperature regulator 70 based on the temperature value of battery 10 to maintain the ambient temperature of battery 10 within the allowable temperature range, so that the charging and discharging of battery 10 can operate normally.

[0098] In one embodiment, there is one temperature sensor 60, which is located near the center of the battery 10. The temperature regulator 70 is a heater and is located around the battery 10. The controller 40 has a temperature threshold. The temperature sensor 60 detects the temperature of the battery 10 and transmits the temperature value to the controller 40. The controller 40 compares the temperature value with the temperature threshold. When the temperature value is lower than the temperature threshold, the temperature of the battery 10 is too low to be suitable for charging and discharging. The controller 40 controls the temperature regulator 70 to heat the surrounding environment of the battery 10, raising the temperature of the battery 10 to above the temperature threshold, so that the temperature of the battery 10 is suitable for operation.

[0099] In another embodiment, there is one temperature sensor 60, which is located near the center of the battery 10. A temperature regulator 70 is located around the battery 10 and includes a heater and a heat sink. The controller 40 has a temperature range, including an upper temperature limit and a lower temperature limit. The temperature sensor 60 detects the temperature of the battery 10 and transmits the temperature value to the controller 40. The controller 40 determines whether the temperature value is within the temperature range. When the temperature value is determined to be outside the temperature range and below the lower temperature limit, the battery 10's temperature is too low to be suitable for charging and discharging. The controller 40 controls the heater to heat the surrounding environment of the battery 10, raising the battery 10's temperature to above the lower temperature limit, making the battery 10's temperature suitable for operation. When the temperature value is determined to be outside the temperature range and above the upper temperature limit, the battery 10's temperature is too high to be suitable for charging and discharging. The controller 40 controls the heat sink to cool the surrounding environment of the battery 10, lowering the battery 10's temperature to below the upper temperature limit, thus preventing high temperatures from affecting the battery 10's performance.

[0100] In addition, when there are multiple batteries 10, multiple temperature sensors 60 are respectively installed on multiple batteries and transmit multiple temperature values ​​to the controller 40 through a shared data transmission line (e.g., I2C bus). The controller 40 determines the operating status of multiple batteries 10 based on the multiple temperature values, so as to further optimize the terminalless battery pack 1A and improve the safety of the terminalless battery pack 1A.

[0101] The current sensor 80 is electrically connected to the battery 10, the bidirectional switch 20, and the controller 40. When the terminalless battery pack 1A is in a powered state, the current sensor 80 detects and transmits the discharge current of the terminalless battery pack 1A to the controller 40. The controller 40 obtains the discharge capacity of the battery 10 by accumulating or integrating the discharge current over time. When the terminalless battery pack 1A is in a charging state, the current sensor 80 detects and transmits the charging current of the terminalless battery pack 1A to the controller 40. The controller 40 obtains the charging capacity of the battery 10 by accumulating or integrating the charging current over time. The controller 40 compares the discharge current, the charging current, and a current threshold. When the discharge current exceeds the current threshold or the charging current exceeds the current threshold, the controller 40 stops the operation of the voltage-controlled oscillator 50 to prevent high current from damaging the terminalless battery pack 1A and to achieve overcurrent protection. Furthermore, when the discharge current or the charging current is zero, it indicates that the terminalless battery pack 1A is neither in a charging state nor in a powered state.

[0102] The voltage sampler 90 is electrically connected to the battery 10, the bidirectional switch 20, and the controller 40. When the terminalless battery pack 1A is in a power-on state, the voltage sampler 90 detects and transmits the discharge voltage of the terminalless battery pack 1A in the power-on state to the controller 40. The controller 40 calculates a first ratio between the discharge capacity and the battery voltage change in the power-on state. When the terminalless battery pack 1A is in a charging state, the voltage sampler 90 detects and transmits the charging voltage of the terminalless battery pack 1A in the charging state to the controller 40. The controller 40 calculates a second ratio between the charging capacity and the battery voltage change in the charging state, and can calculate the resistance of the charging circuit based on the charging current and charging voltage. The first and second ratios are important parameters that characterize the lifespan of the battery 10 and also important parameters that reflect the degree of aging of the battery 10. The controller 40 estimates the lifespan of the battery 10 based on the first and second ratios. The aforementioned battery voltage change refers to the voltage change of the terminalless battery pack 1A. The battery voltage change in the power-on state is the discharge voltage change of the terminalless battery pack 1A in the power-on state, and the battery voltage change in the charging state is the charging voltage change of the terminalless battery pack 1A in the charging state.

[0103] Furthermore, to ensure that the charging and discharging voltages are within the input voltage range of the controller 40, the voltage sampler 90 is a voltage divider composed of series resistors, with a fixed voltage division ratio. Therefore, when the battery 10 is in a power-supply state (without terminals 1A), the voltage decreases according to the voltage division ratio to generate the supply voltage, which is within the input voltage range of the controller 40; similarly, when the battery 10 is in a charging state (without terminals 1A), the voltage decreases according to the voltage division ratio to generate the charging voltage, which is within the input voltage range of the controller 40.

[0104] When the terminalless battery pack 1A is in a powered state, but the voltage of battery 10 is abnormal and unable to perform its power supply function, the terminalless battery pack 1A requires a backup power supply configuration to maintain its power supply function. The configuration of the backup power supply will be described below. Further references Figure 6 This is a diagram illustrating the configuration of diodes, capacitors, and voltage regulators according to an embodiment of this application. Figure 6 As shown, and paired with Figure 5 The backup power supply includes diode 100, capacitor 110 and voltage regulator 120.

[0105] Diode 100 is electrically connected to battery 10 and bidirectional switch 20. Capacitor 110 is electrically connected to diode 100 and voltage regulator 120. Voltage regulator 120 is electrically connected to battery 11 and controller 40. When the terminalless battery pack 1A is powered, controller 40 obtains the discharge voltage from voltage sampler 90 and determines whether the discharge voltage falls within the normal voltage range. When controller 40 determines that the discharge voltage falls within the normal voltage range, the voltage Vcc at one end of diode 100 is greater than the voltage of capacitor 110. Diode 100 is forward biased and conducts, and battery 10 charges capacitor 110 and supplies power to voltage regulator 120. Capacitor 110 stores electrical energy. In addition, since voltage regulator 120 has a wide input voltage range, it can convert the voltage of battery 10 into the operating voltage required by controller 40. Voltage regulator 120 provides operating voltage to controller 40, enabling controller 40 to operate normally. When the controller 40 determines that the discharge voltage is not within the normal voltage range, the voltage Vec at one end of the diode 100 is less than the voltage of the capacitor 110. The diode 100 is reverse biased and disconnects in reverse, causing the capacitor 110 to discharge. The voltage of the capacitor 110 is input to the voltage regulator 120, which generates and outputs a backup voltage to the battery 10 based on the voltage of the capacitor 110. Through the aforementioned charging and discharging mechanism of the capacitor 110, in the event that the battery 10 cannot supply power normally due to abnormal voltage, the backup voltage of the capacitor 110 can still maintain the power supply function of the terminalless battery pack 1A.

[0106] Trigger 130 is electrically connected to controller 40. Trigger 130 is a mechanical trigger (e.g., a push-button switch). Trigger 130 generates and transmits a trigger signal to controller 40 by pressing. Controller 40 selectively operates in either a power-on state or a charging state based on the trigger signal. When trigger 130 generates and transmits a first trigger signal to controller 40 by pressing, controller 40 selects to operate in the power-on state and transmits a first control signal to voltage-controlled oscillator 50. Voltage-controlled oscillator 50 generates and transmits an operating signal to bidirectional switcher 20 based on the first control signal. Bidirectional switcher 20 switches to driver mode based on the operating frequency of the operating signal. When trigger 130 generates and transmits a second trigger signal to controller 40 by pressing, controller 40 selects to operate in the charging state based on the second trigger signal and transmits a second control signal to voltage-controlled oscillator 50. Voltage-controlled oscillator 50 generates and transmits an operating signal to bidirectional switcher 20 based on the second control signal. Bidirectional switcher 20 switches to rectifier mode based on the operating frequency of the operating signal. Since the driver and rectifier are used for different purposes, the operating signal corresponding to the bidirectional switch 20 when it is switched to driver use is different from the operating signal corresponding to the bidirectional switch 20 when it is switched to rectifier use. The operating frequency corresponding to the bidirectional switch 20 when it is switched to driver use is different from the operating frequency corresponding to the bidirectional switch 20 when it is switched to rectifier use.

[0107] The communicator 140 is electrically connected to the controller 40 and can be a Bluetooth wireless transceiver or a LoRa wireless transceiver. See also... Figure 2A and Figure 2B The terminalless battery pack 1A communicates wirelessly with the wireless load 1B and the wireless charger 1C via the communicator 140 to receive power supply information from the wireless load 1B or transmit charging information to the wireless charger 1C. For example, the power supply information is the input voltage range of the wireless load 1B, and the charging information is the remaining power of the battery 10. It is worth mentioning that the wireless signal (e.g., radio frequency signal) emitted by the communicator 140 has a different resonant frequency than the switching transformer, and the communicator 140 and the switching transformer can operate simultaneously without conflict.

[0108] As mentioned above, considering the calculation of the first ratio, the second ratio, temperature rise, and the internal resistance information of battery 10, controller 40 needs to possess superior computing power in addition to signal generation and control capabilities. Furthermore, controller 40 stores the identification code of the terminalless battery pack 1A and various parameters of battery 10, such as the first ratio, the second ratio, and the internal resistance information of battery 10.

[0109] Please refer to the following: Figure 2A , Figure 2B as well as Figure 5The wireless power transmission system 1 for the terminalless battery pack is applied to an electric vehicle. A wireless load 1B is fixedly mounted on the electric vehicle and provides power to it. A wireless charger 1C is located in a convenient location for the user. When the terminalless battery pack 1A needs charging, the user places it on the wireless charger 1C. The second magnetic core wire group 30B of the wireless charger 1C is the power supply end (primary end) of the switching transformer, and the first magnetic core wire group 30A of the terminalless battery pack 1A is the receiving end (secondary end) of the switching transformer. The communicator of the wireless charger 1C sends a charging signal to the communicator 140 of the terminalless battery pack 1A. The communicator 140 of the terminalless battery pack 1A transmits the charging signal to the controller 40 of the terminalless battery pack 1A. The controller 40 of the terminalless battery pack 1A operates in charging mode according to the charging signal and controls the voltage-controlled oscillator 50 to generate and transmit a working signal to the bidirectional switcher 20. The bidirectional switcher 20 switches to rectifier mode according to the working signal. Next, the controller 40 of the terminalless battery pack 1A obtains the charging voltage of the battery 10 from the voltage sampler 90 of the terminalless battery pack 1A, and transmits the charging voltage of the battery 10 to the communicator of the wireless charger 1C through the communicator 140 of the terminalless battery pack 1A. The controller of the wireless charger 1C receives the charging voltage of the battery 10 from the communicator of the wireless charger 1C, sets the optimal charging energy according to the charging voltage of the battery 10, and charges the terminalless battery pack 1A wirelessly.

[0110] When the terminalless battery pack 1A and the wireless load device 1B approach each other to an effective sensing distance, the first magnetic core wire group 30A of the terminalless battery pack 1A becomes the power supply end (primary end) of the switching transformer, and the second magnetic core wire group 30B of the wireless load device 1B becomes the receiving end (secondary end) of the switching transformer. The communicator of the wireless load device 1B sends a power supply signal to the communicator 140 of the terminalless battery pack 1A. The communicator 140 of the terminalless battery pack 1A transmits the power supply signal to the controller 40 of the terminalless battery pack 1A. The controller 40 of the terminalless battery pack 1A operates in the power supply state according to the power supply signal and controls the voltage-controlled oscillator 50 to generate and transmit the working signal to the bidirectional switcher 20. The bidirectional switcher 20 switches to driver use according to the working signal. Next, the controller 40 of the terminalless battery pack 1A obtains the power supply voltage of the battery 10 from the voltage sampler 90 of the terminalless battery pack 1A, and determines whether the current power of the battery 10 is sufficient to continuously charge the wireless load 1B and whether external power (such as the power of the wireless charger 1C) is required based on the power supply voltage.

[0111] Please see Figure 7 This is a configuration diagram illustrating a wireless power transmission system for a terminalless battery pack according to another embodiment of this application. Figure 7As shown, the wireless power transmission system 2 with a terminalless battery pack includes a first switching transformer, a second switching transformer, a terminalless battery pack 2A, a wireless load 2B, and a wireless charger 2C. The first switching transformer includes a first magnetic core wire group 31A and a third magnetic core wire group 31C, which are separately disposed. The first magnetic core wire group 31A is the primary terminal of the first switching transformer, and the third magnetic core wire group 31C is the secondary terminal. When the first magnetic core wire group 31A and the third magnetic core wire group 31C are close together, electromagnetic coupling occurs; when they are far apart, there is no electromagnetic coupling. The second switching transformer includes a second magnetic core wire group 31B and a fourth magnetic core wire group 31D. The second magnetic core wire group 31B and the fourth magnetic core wire group 31D are separately disposed. The second magnetic core wire group 31B belongs to the secondary terminal of the second switching transformer, and the fourth magnetic core wire group 31D belongs to the primary terminal of the second switching transformer. When the second magnetic core wire group 31B and the fourth magnetic core wire group 31D are close together and in a closed state, electromagnetic coupling is generated; when the second magnetic core wire group 31B and the fourth magnetic core wire group 31D are far apart and in a separated state, there is no electromagnetic coupling. In this embodiment, the terminalless battery pack 2A is a stationary function terminalless battery pack and includes a battery 10, a driver 20A, and a rectifier 20B. The first magnetic core wire group 31A of the first switching transformer and the second magnetic core wire group 31B of the second switching transformer are disposed in the terminalless battery pack 2A. The configuration of the battery 10 and the first magnetic core wire group 30A is similar to... Figure 1 The battery 10 shown is similar in configuration and will not be described again; in addition, Figure 3 The bidirectional switch shown can be used as a driver 20A. Figure 4 The bidirectional switch shown can function as rectifier 20B; the detailed configurations of driver 20A and rectifier 20B will not be repeated here. Driver 20A and rectifier 20B are electrically connected to battery 10, respectively. The first magnetic core wire group 31A is electrically connected to driver 20A, and the second magnetic core wire group 31B is electrically connected to rectifier 20B; in other words, driver 20A is positioned between the first magnetic core wire group 30A and battery 10, and rectifier 20B is positioned between the second magnetic core wire group 30B and battery 10. The third magnetic core wire group 31C of the first switching transformer is located in wireless load 2B. The fourth magnetic core wire group 31D of the second switching transformer is located in wireless charger 2C.

[0112] In one embodiment, the driver 20A and the rectifier 20B are arranged independently of each other, and the first magnetic core wire group 31A and the second magnetic core wire group 31B are arranged independently of each other. The first magnetic core wire group 31A is arranged corresponding to the driver 20A, and the second magnetic core wire group 31B is arranged corresponding to the rectifier 20B.

[0113] The second magnetic core wire group 31B, the third magnetic core wire group 31C, and the fourth magnetic core wire group 31D respectively include a second magnetic core, a third magnetic core, and a fourth magnetic core of a wound coil. The second, third, and fourth magnetic cores can be, but are not limited to, can-shaped magnetic cores, E-shaped magnetic cores, or semi-toroidal magnetic cores. The materials of the second, third, and fourth magnetic cores can be, but are not limited to, ferrite. The coils of the second magnetic core wire group 31B, the third magnetic core wire group 31C, and the fourth magnetic core wire group 31D can be made of single-strand enameled wire or multi-strand enameled wire. The number of the second magnetic core wire group 31B, the third magnetic core wire group 31C, and the fourth magnetic core wire group 31D can be adjusted to one or more groups according to the needs of the wireless power transmission system 2 for the terminalless battery pack. The number of the second magnetic core, the third magnetic core, and the fourth magnetic core can be one or more. There is no limitation on the number of the second magnetic core wire group 31B, the third magnetic core wire group 31C, and the fourth magnetic core wire group 31D, or on the number of the second, third, and fourth magnetic cores.

[0114] When the first magnetic core wire group 31A approaches the third magnetic core wire group 31C, the first magnetic core wire group 31A and the third magnetic core wire group 31C form a first switching transformer. When the second magnetic core wire group 31B approaches the fourth magnetic core wire group 31D, the second magnetic core wire group 31B and the fourth magnetic core wire group 31D form a second switching transformer. In one embodiment, the number of groups of the first magnetic core wire group 31A, the second magnetic core wire group 31B, the third magnetic core wire group 31C, and the fourth magnetic core wire group 31D are each one group. One group of the first magnetic core wire group 31A and one group of the third magnetic core wire group 31C form a first switching transformer, and the first magnetic core wire group 31A and the third magnetic core wire group 31C are separately arranged. One group of the second magnetic core wire group 31B and one group of the fourth magnetic core wire group 31D form a second switching transformer, and the second magnetic core wire group 31B and the fourth magnetic core wire group 31D are separately arranged. In another embodiment, the number of groups of the first magnetic core wire group 31A and the second magnetic core wire group 31B is one group each, and the number of groups of the third magnetic core wire group 31C and the fourth magnetic core wire group 31D is multiple groups each. One group of the first magnetic core wire group 31A and multiple groups of the third magnetic core wire group 31C form multiple first switching transformers, and the first magnetic core wire group 31A and multiple groups of the third magnetic core wire group 31C are separately arranged. One group of the second magnetic core wire group 31B and multiple groups of the fourth magnetic core wire group 31D form multiple second switching transformers, and the second magnetic core wire group 31B and multiple groups of the fourth magnetic core wire group 31D are separately arranged. In another embodiment, the number of first magnetic core wire groups 31A, second magnetic core wire groups 31B, third magnetic core wire groups 31C, and fourth magnetic core wire groups 31D are multiple. One group of first magnetic core wire groups 31A and one group of third magnetic core wire groups 31C form a first switching transformer, thereby forming multiple first switching transformers. The multiple groups of first magnetic core wire groups 31A and multiple groups of third magnetic core wire groups 31C are separately arranged. One group of second magnetic core wire groups 31B and one group of fourth magnetic core wire groups 31D form a second switching transformer, thereby forming multiple second switching transformers. The multiple groups of second magnetic core wire groups 31B and multiple groups of fourth magnetic core wire groups 31D are separately arranged.

[0115] Please see Figure 8 This is a schematic diagram illustrating the wireless power transmission system for a terminalless battery pack in a power-on state and a charging state, according to another embodiment of this application. Figure 8 As shown, the wireless load 2B is located on one side of the terminalless battery pack 2A, and the wireless charger 2C is located on the other side of the terminalless battery pack 2A. It should be noted that the first magnetic core wire group 31A is fixed to the primary terminal of the first switching transformer and serves as the primary magnetic core wire group; the second magnetic core wire group 31B is fixed to the secondary terminal of the second switching transformer and serves as the secondary magnetic core wire group; correspondingly, the third magnetic core wire group 31C belongs to the secondary terminal of the first switching transformer and serves as the secondary magnetic core wire group, and the fourth magnetic core wire group 31D belongs to the primary terminal of the second switching transformer and serves as the primary magnetic core wire group.

[0116] When the terminalless battery pack 2A is close to the wireless load device 2B, the terminalless battery pack 2A switches to power supply mode, and the battery 10 is considered as a power source. The first magnetic core wire group 31A and the third magnetic core wire group 31C are close to each other and in a closed state. Through the electromagnetic coupling of the primary and secondary magnetic core wire groups of the first switching transformer, a first magnetic flux loop is formed between the first magnetic core of the first magnetic core wire group 31A and the third magnetic core wire group 31C. The battery 10 transmits the first electrical energy to the load element L1 through the driver 20A and the first magnetic flux loop, that is, the battery 10 provides the first electrical energy to the wireless load device 2B through the driver 20A and the first switching transformer. When the terminalless battery pack 2A is not close to the wireless load device 2B, the first magnetic core wire group 31A and the third magnetic core wire group 31C are in a separated state. The first magnetic core wire group 31A is not coupled to the third magnetic core wire group 31C, and the terminalless battery pack 2A does not perform the power supply function.

[0117] When the terminalless battery pack 2A is near the wireless charger 2C, it switches to charging mode, and battery 10 is considered an energy storage device. The second magnetic core wire group 31B and the fourth magnetic core wire group 31D are close together. Through the electromagnetic coupling of the primary and secondary magnetic core wire groups of the second switching transformer, a second magnetic flux loop is formed between the second core of the second magnetic core wire group 31B and the fourth core of the fourth magnetic core wire group 31D. Battery 10 receives second electrical energy from charger C1 through rectifier 20B and the second magnetic flux loop, that is, battery 10 receives second electrical energy from wireless charger 1C through rectifier 20B and the second switching transformer. When the terminalless battery pack 2A is not near the wireless charger 2C, the second magnetic core wire group 31B and the fourth magnetic core wire group 31D are separated, the second magnetic core wire group 31B is not coupled to the fourth magnetic core wire group 31D, and the terminalless battery pack 2A does not perform the charging function.

[0118] In the wireless power transmission system of the terminalless battery pack of this embodiment, the power supply function is performed through the configuration of the driver, the first magnetic core wire group, and the third magnetic core wire group; the charging function is performed through the configuration of the rectifier, the second magnetic core wire group, and the fourth magnetic core wire group. Therefore, the wireless power transmission system of the terminalless battery pack of this embodiment has both power supply and charging functions. When the wireless power transmission system of the terminalless battery pack of this embodiment is applied to an electric vehicle, the terminalless battery pack and the wireless load are fixedly mounted on the electric vehicle, and the terminalless battery pack continuously supplies power to the wireless load; the wireless charger only approaches the terminalless battery pack when the terminalless battery pack needs charging, and the terminalless battery pack receives the power provided by the wireless charger. When the wireless power transmission system of the terminalless battery pack of this embodiment is applied to an artificial heart pacemaker, the battery of the artificial heart pacemaker is charged wirelessly, without the need for surgical replacement of the battery.

[0119] The configuration of the terminalless battery pack 2A will be further described below. Please refer to [link / reference]. Figure 9 This is a configuration diagram of a terminalless battery pack according to another embodiment of this application. Figure 9 As shown, the terminalless battery pack 2A includes a battery 10, a driver 20A, a rectifier 20B, a first magnetic core wire group 31A, a second magnetic core wire group 31B, a controller 40, a voltage-controlled oscillator 50, a temperature sensor 60, a temperature regulator 70, a current sensor 80, a voltage sampler 90, a diode 100, a capacitor 110, a voltage regulator 120, a trigger 130, and a communicator 140. The configuration of the battery 10, controller 40, voltage-controlled oscillator 50, temperature sensor 60, temperature regulator 70, current sensor 80, voltage sampler 90, diode 100, capacitor 110, voltage regulator 120, trigger 130, and communicator 140 is consistent with... Figure 5 The configuration shown is similar and will not be repeated here. The configuration of the driver 20A and the first magnetic core wire group 31A is the same as... Figure 5 The bidirectional switch 20 shown is similar to the first magnetic core wire group 30A, and the power supply functions corresponding to the driver 20A and the first magnetic core wire group 31A are the same. Figure 5 The bidirectional switch 20 and the first magnetic core wire group 30A shown have the same power supply function when in power supply state, and will not be described again here.

[0120] like Figure 9 As shown, since the driver 20A and the rectifier 20B correspond to the first magnetic core wire group 31A and the second magnetic core wire group 31B respectively, rather than a combination of a magnetic core wire group and a driver, therefore in Figure 5 Based on the configuration shown, the electrical connections of some components are modified. The modifications to the electrical connections of some components are explained below: Battery 10, current sensor 80, and voltage-controlled oscillator 50 are electrically connected to rectifier 20B. Correspondingly, controller 40 sends a first control signal corresponding to driver 20A to voltage-controlled oscillator 50. Voltage-controlled oscillator 50 outputs a first operating signal to driver 20A according to the first control signal, and driver 20A operates according to a first operating frequency of the first operating signal. Controller 40 sends a second control signal corresponding to rectifier 20B to voltage-controlled oscillator 50. Voltage-controlled oscillator 50 outputs a second operating signal to rectifier 20B according to the second control signal, and rectifier 20B operates according to a second operating frequency of the second operating signal.

[0121] When the coupling state between the first magnetic core wire group 31A and the third magnetic core wire group 31C, or the coupling state between the second magnetic core wire group 31B and the fourth magnetic core wire group 31D, is strong coupling, the controller 40 controls the voltage-controlled oscillator 50 to adjust the first operating frequency or the second operating frequency, so that the efficiency of the terminalless battery pack 2A reaches its maximum efficiency or the power of the terminalless battery pack 2A reaches its maximum power. When the coupling state between the first magnetic core wire group 31A and the third magnetic core wire group 31C, or the coupling state between the second magnetic core wire group 31B and the fourth magnetic core wire group 31D, is weak coupling, the controller 40 controls the voltage-controlled oscillator 50 to adjust the first operating frequency or the second operating frequency, so that the terminalless battery pack 2A is maintained in a resonant state. In other words, the controller 40 controls the voltage-controlled oscillator 50 to adjust the first operating signal according to the coupling state of the first magnetic core wire group 31A and the third magnetic core wire group 31C, and controls the voltage-controlled oscillator 50 to adjust the second operating signal according to the coupling state of the second magnetic core wire group 31B and the fourth magnetic core wire group 31D.

[0122] The detailed configuration of the wireless loader 2B is described as an example below. Please refer to [link / reference]. Figure 10 This is a configuration diagram of a wireless loader according to an embodiment of this application. Figure 10 As shown, the wireless load device 2B includes a third magnetic core wire group 31C, a rectifier 2B-10, a current sensor 2B-20, a controller 2B-30, a communicator 2B-40, a discharge start signal 2B-50, and a load element L1. The configuration of the third magnetic core wire group 31C is shown in the corresponding diagram. Figure 7 and Figure 8 The paragraphs will explain this further without repeating the details.

[0123] The rectifier 2B-10 is electrically connected to the third magnetic core wire group 31C and the current sensor 2B-20. Figure 4The bidirectional switch shown can be used as rectifier 2B-10, and the detailed configuration of rectifier 2B-10 will not be described again here. Current sensor 2B-20 is electrically connected to rectifier 2B-10 and controller 2B-30, and detects and transmits the current flowing through rectifier 2B-10 to controller 2B-30. Controller 2B-30 determines whether the current flowing through rectifier 2B-10 is greater than the current threshold value, and selectively sends a power supply stop signal communicator. Communicator 2B-40 of wireless load 2B is wirelessly connected to communicator 140 of terminalless battery pack 2A. Wireless load 2B transmits power request signals and power supply stop signals to terminalless battery pack 2A through communicator 2B-40; or, wireless load 2B is wirelessly connected to communicator 140 of terminalless battery pack 1A to transmit power request signals and power supply stop signals to terminalless battery pack 1A. The discharge start signal unit 2B-50 generates and transmits a start signal to the controller 2B-30 based on the trigger signal generated by the trigger 130 of the terminalless battery pack 2A, the trigger signal generated by the trigger 130 of the terminalless battery pack 1A, or the load element L1. The load element L1 can be the controller of a DC motor or other types of load elements.

[0124] When the trigger 130 of terminalless battery pack 2A or terminalless battery pack 1A is electrically connected to the discharge start signal 2B-50, the trigger signal generated by the trigger 130 of terminalless battery pack 2A or terminalless battery pack 1A is transmitted to the discharge start signal 2B-50. The discharge start signal 2B-50 generates and transmits a start signal to the controller 2B-30 according to the trigger signal, and the controller 2B-30 starts. When the load element L1 transmits a start request signal to the discharge start signal 2B-50, the discharge start signal 2B-50 generates and transmits a start signal to the controller 2B-30 according to the start request signal, and the controller 2B-30 starts.

[0125] After controller 2B-30 is activated, it transmits a power request signal to communicator 140 of terminalless battery pack 2A or terminalless battery pack 1A via communicator 2B-40. The driver 20A of terminalless battery pack 2A or the bidirectional switch 20 of terminalless battery pack 1A then begins operation to transfer initial power to wireless load 2B. When controller 2B-30 determines that the current of rectifier 2B-10 exceeds the current threshold or the load element L1 transmits a power supply termination signal to controller 2B-30 via discharge start signal 2B-50, controller 2B-30 transmits a power supply stop signal to terminalless battery pack 2A or terminalless battery pack 1A via communicator 2B-40.

[0126] The detailed configuration of the Wireless Charger 2C is described as an example below. Please refer to [link / reference]. Figure 11 This is a configuration diagram of a wireless charger according to an embodiment of this application. Figure 11 As shown, the wireless charger 2C includes an AC power supply AC1, an AC-DC converter 2C-10, a current sensor 2C-20, a driver 2C-30, a controller 2C-40, an oscillator 2C-50, a charging start signal 2C-60, a communicator 2C-70, and a fourth magnetic core wire group 31D. The configuration of the fourth magnetic core wire group 31D is shown in the corresponding... Figure 7 and Figure 8 The paragraphs will explain this further without repeating the details.

[0127] AC power supply AC1 is electrically connected to AC-DC converter 2C-10 to provide AC voltage to AC-DC converter 2C-10. AC-DC converter 2C-10 is electrically connected to driver 2C-30 and controller 2C-40, and converts AC voltage to DC voltage. Driver 2C-30 is electrically connected to oscillator 2C-50 and fourth magnetic core wire group 31D to receive DC voltage and drive the fourth magnetic core wire group 31D. Figure 3 The bidirectional switch shown can function as driver 2C-30; the detailed configuration of driver 2C-30 will not be repeated here. Current sensor 2C-20 is electrically connected to current sensor 2C-20, driver 2C-30, and controller 2B-30, and detects and transmits the current flowing from AC-DC converter 2C-10 to rectifier 2B-10 to controller 2C-40. Controller 2C-40 is electrically connected to AC-DC converter 2C-10, oscillator 2C-50, charging start signal 2C-60, and communicator 2C-70, and controls the operation of oscillator 2C-50 of AC-DC converter 2C-10. Oscillator 2C-50 is electrically connected to driver 2C-30; controller 2C-40 controls oscillator 2C-50 to generate and transmit oscillation signals to driver 2C-30, and driver 2C-30 operates according to the oscillation signals. The wireless charger 2C's communicator 2C-70 is wirelessly connected to the communicators 140 of the terminalless battery pack 2A and 1A to receive identification codes from terminalless battery pack 2A or 1A and to transmit charging preparation signals to terminalless battery pack 2A or 1A. The charging start signal transmitter 2C-60 generates and transmits a charging start signal to the controller 2C-40 based on the trigger signal generated by the trigger 130 of terminalless battery pack 2A or terminalless battery pack 1A.

[0128] When the trigger 130 of the terminalless battery pack 2A or the trigger 130 of the terminalless battery pack 1A is electrically connected to the charging start signal 2C-60, the trigger signal generated by the trigger 130 of the terminalless battery pack 2A or the trigger 130 of the terminalless battery pack 1A is transmitted to the charging start signal 2C-60. The charging start signal 2C-60 generates and transmits a charging start signal to the controller 2C-40 according to the trigger signal of the terminalless battery pack 2A or the trigger signal of the terminalless battery pack 1A, and the controller 2C-40 is activated.

[0129] After controller 2C-40 transmits an inquiry signal to terminalless battery pack 1A via communicator 2C-70, controller 40 of terminalless battery pack 1A operates in charging mode and controls voltage-controlled oscillator 50 to generate and transmit operating signals to bidirectional switcher 20. Bidirectional switcher 20 switches to rectifier mode according to the operating signals. At this time, controller 40 of terminalless battery pack 1A transmits an identification code to wireless charger 2C via communicator 140. Wireless charger 2C confirms that the identification code provided by terminalless battery pack 1A is a valid identification code. Then, controller 40 of wireless charger 2C obtains charging current, charging voltage, and charging circuit resistance from terminalless battery pack 1A via communicator 140.

[0130] Then, the controller 40 of the wireless charger 2C, based on the charging voltage of the terminalless battery pack 1A, controls the AC-DC converter 2C-10 to generate a corresponding DC voltage and controls the oscillator 2C-50 to generate a corresponding oscillation signal. The driver 2C-30 then starts operating to transfer the second electrical energy to the terminalless battery pack 1A. Finally, the controller 40 of the terminalless battery pack 1A obtains the new charging voltage and new charging current through the voltage sampler 90 and the current sensor 80, and calculates the resistance of the new charging circuit and the new second ratio based on the new charging voltage and new charging current. As the wireless charger 2C continuously provides the second electrical energy to the terminalless battery pack 1A, the battery in the terminalless battery pack 1A gradually becomes fully charged.

[0131] After controller 2C-40 transmits an inquiry signal to terminalless battery pack 2A via communicator 2C-70, controller 40 of terminalless battery pack 2A operates in charging mode and controls voltage-controlled oscillator 50 to generate and transmit operating signals to rectifier 20B. Rectifier 20B then operates to receive second electrical energy from wireless charger 2C. At this time, controller 40 of terminalless battery pack 2A transmits an identification code to wireless charger 2C via communicator 140. Wireless charger 2C confirms that the identification code provided by terminalless battery pack 2A is a valid identification code. Subsequently, controller 40 of wireless charger 2C obtains the charging current, charging voltage, and charging circuit resistance from terminalless battery pack 2A via communicator 140.

[0132] Then, the controller 40 of the wireless charger 2C, based on the charging voltage of the terminalless battery pack 2A, controls the AC-DC converter 2C-10 to generate a corresponding DC voltage and controls the oscillator 2C-50 to generate a corresponding oscillation signal. The driver 2C-30 then starts operating to transfer the second electrical energy to the terminalless battery pack 2A. Finally, the controller 40 of the terminalless battery pack 2A obtains the new charging voltage and new charging current through the voltage sampler 90 and the current sensor 80, and calculates the resistance of the new charging circuit and the new second ratio based on the new charging voltage and new charging current. As the wireless charger 2C continuously provides the second electrical energy to the terminalless battery pack 2A, the battery in the terminalless battery pack 2A gradually becomes fully charged.

[0133] The following text will be based on Figure 11 The AC power supply AC1 shown further illustrates the configuration of the AC-DC converter 2C-10. Please refer to [link / reference]. Figure 12 This is a diagram illustrating the configuration of an AC-DC converter in a wireless charger according to an embodiment of this application. Figure 12 As shown, the AC-DC converter 2C-10 includes switches S11 to S14 and transformer coil L. Switches S11 to S14 and transformer coil L form a full-bridge AC-DC converter. Of course, the AC-DC converter 2C-10 can also be other types of AC-DC converters and is not limited to this.

[0134] When switches S11 and S14 are on, and switches S12 and S13 are off, the current generated by the AC power supply AC1 flows through switch S11 into one end of the transformer coil L, and flows out from the other end of the transformer coil L through switch S14. When switches S12 and S13 are on, and switches S11 and S14 are off, the current generated by the AC power supply AC1 flows through switch S13 into the other end of the transformer coil L, and flows out from one end of the transformer coil L through switch S12. By alternately switching switches S1 and S4, and switches S2 and S3, the AC voltage is converted into a DC voltage.

[0135] The power a transformer can transmit is related to its size, and more specifically, the power it can transmit is closely related to its effective cross-sectional area; the greater the power transmitted, the larger the required effective cross-sectional area. However, in the actual production of magnetic cores (e.g., pot cores), the manufacturing capabilities of pot core manufacturing equipment make it difficult to produce large-area cores. Therefore, the following section will further describe how to improve the power transmission capacity of switching transformers by adjusting the configuration of pot cores.

[0136] Please see Figure 13A as well as Figure 13BThe above are schematic diagrams illustrating a plurality of first magnetic cores connected in series and a plurality of first magnetic cores connected in parallel, according to an embodiment of the present application. Figure 13A and Figure 13B To illustrate the configuration adjustment of multiple magnetic cores using the first magnetic core wire group 30A as an example, the configuration adjustments of the second magnetic core wire group 30B, the first magnetic core wire group 31A, the second magnetic core wire group 31B, the third magnetic core wire group 31C, and the fourth magnetic core wire group 31D are the same as those of the first magnetic core wire group 30A, and will not be described again.

[0137] like Figure 13A As shown, the four first magnetic core wire groups 30A are connected in series to increase the transmission voltage of the switching transformer. Figure 13B As shown, the four first magnetic core wire groups 30A are connected in parallel to increase the transmission current of the switching transformer.

[0138] To further improve the electromagnetic interference (EMI) leakage caused by winding multiple magnetic core wire groups in parallel, the structure of the magnetic core needs to be further adjusted. The structural adjustment of the magnetic core will be further described below.

[0139] Please see Figures 14A to 14C The above are structural diagrams of the first magnetic core according to one embodiment of the present application, another embodiment of the present application, and yet another embodiment of the present application. Figures 14A to 14C To illustrate the structural adjustment of a magnetic core using a single magnetic core as an example, the structural adjustment of the magnetic core is applicable to the first magnetic core wire group 30A, the second magnetic core wire group 30B, the first magnetic core wire group 31A, the second magnetic core wire group 31B, the third magnetic core wire group 31C, and the fourth magnetic core wire group 31D.

[0140] like Figure 14A As shown, the magnetic core includes a base plate B1, a magnetic pillar RD1, two side walls SW1, and two wiring slots SL1. The magnetic pillar RD1 is mounted on the base plate B1 and is a hollow cylinder. The two side walls SW1 and the two wiring slots SL1 are located around the periphery of the base plate and surround the magnetic pillar RD1; the two wiring slots SL1 are located between the two side walls SW1. In other words, the two side walls SW1 are separately mounted, and each side wall SW1 is separately mounted from the magnetic pillar RD1.

[0141] like Figure 14B As shown, the magnetic core includes a base plate B1, magnetic pillars RD1, three side walls SW1, and three wiring slots SL1. The configuration of the base plate B1, magnetic pillars RD1, side walls SW1, and wiring slots SL1 is similar to... Figure 14A Similar configurations Figure 14A Implementation examples and Figure 14BThe similarities to the embodiments will not be repeated, but Figure 14A Implementation examples and Figure 14B The differences in the embodiments are: three sidewalls SW1 and three wiring channels SL1.

[0142] like Figure 14C As shown, the magnetic core includes a base plate B1, magnetic pillars RD1, four side walls SW1, and four wiring slots SL1. The configuration of the base plate B1, magnetic pillars RD1, side walls SW1, and wiring slots SL1 is similar to... Figure 14A Similar configurations Figure 14A Implementation examples and Figure 14C The similarities to the embodiments will not be repeated, but Figure 14A Implementation examples and Figure 14C The differences in the embodiments are: four sidewalls SW1 and four wiring channels SL1.

[0143] The following section uses the configuration of the first magnetic core wire group 30A and the second magnetic core wire group 30B to illustrate how to effectively maintain the weak coupling of the switching transformer. Please refer to further information. Figure 15 This is a schematic diagram illustrating a shield-shaped shield according to an embodiment of this application. Figure 15 As shown, the first magnetic core wire group 30A and the second magnetic core wire group 30B are located inside the dome shield SC1, and the shielding plate SP1 is disposed on the second magnetic core wire group 30B to effectively avoid external EMI.

[0144] In summary, the wireless power transmission system for terminalless battery packs of this application forms a switching transformer through the configuration of two magnetic core wire groups. The configuration of the switching transformer enables the charging and power supply of the terminalless battery pack to be achieved through wireless transmission, without the need for metal connectors or connection terminals, thereby improving reliability and reducing safety risks.

Claims

1. A wireless power transmission system for a terminalless battery pack, characterized in that, include: The switching transformer includes a first magnetic core wire group and a second magnetic core wire group. The first magnetic core wire group and the second magnetic core wire group are separately arranged. When the first magnetic core wire group and the second magnetic core wire group are close to each other and in a closed state, electromagnetic coupling is generated. When the first magnetic core wire group and the second magnetic core wire group are far apart and in a separated state, there is no electromagnetic coupling. A terminalless battery pack includes a battery and a bidirectional switch, wherein the battery is electrically connected to the bidirectional switch, and the first magnetic core wire group of the switching transformer is disposed in the terminalless battery pack, and the bidirectional switch is electrically connected to the first magnetic core wire group. Wireless load device, wherein the second magnetic core wire group of the switching transformer is disposed on the wireless load device; and A wireless charger, wherein the second magnetic core wire group of the switching transformer is disposed in the wireless charger; When the terminalless battery pack is near the wireless load, it is in a power-on state. The bidirectional switch acts as a driver, and the first and second magnetic core wire groups are in a closed state, generating electromagnetic coupling. The battery provides first electrical energy to the wireless load through the driver and the switching transformer. When the terminalless battery pack is near the wireless charger, it is in a charging state. The bidirectional switch acts as a rectifier, and the first and second magnetic core wire groups are in a closed state, generating electromagnetic coupling. The battery receives second electrical energy from the wireless charger through the switching transformer and the rectifier.

2. The wireless power transmission system for terminalless battery packs as described in claim 1, characterized in that, When the terminalless battery pack is close to the wireless load, the first magnetic core wire group belongs to the primary terminal of the switching transformer, and the second magnetic core wire group belongs to the secondary terminal of the switching transformer; when the terminalless battery pack is close to the wireless charger, the first magnetic core wire group belongs to the secondary terminal of the switching transformer, and the second magnetic core wire group belongs to the primary terminal of the switching transformer.

3. The wireless power transmission system for terminalless battery packs as described in claim 1, characterized in that, The terminalless battery pack also includes a bypass circuit, which is electrically connected to the bidirectional switch and assists the bidirectional switch in voltage regulation.

4. The wireless power transmission system for terminalless battery packs as described in claim 1, characterized in that, The terminalless battery pack also includes a controller and a voltage-controlled oscillator (VCO). The controller is electrically connected to the VCO, and the VCO is electrically connected to the bidirectional switch. The controller controls the VCO to output a working signal to the bidirectional switch, and the bidirectional switch operates according to the working signal.

5. The wireless power transmission system for terminalless battery packs as described in claim 4, characterized in that, The controller controls the voltage-controlled oscillator to adjust the operating signal according to the coupling state of the first magnetic core wire group and the second magnetic core wire group.

6. The wireless power transmission system for terminalless battery packs as described in claim 4, characterized in that, The terminalless battery pack also includes a temperature sensor and a temperature regulator, which are electrically connected to the controller. The temperature sensor detects and transmits the temperature value of the battery to the controller. The controller determines whether the temperature value is within the allowable temperature range. When the controller determines that the temperature value is not within the temperature range, it controls the temperature regulator to start to adjust the temperature value.

7. The wireless power transmission system for terminalless battery packs as described in claim 4, characterized in that, The terminalless battery pack also includes a current sensor, which is electrically connected to the battery, the bidirectional switch, and the controller. The current sensor detects and transmits the discharge current of the terminalless battery pack when it is in the power supply state and the charging current of the terminalless battery pack when it is in the charging state to the controller. The controller compares the discharge current or the charging current with a current threshold. When the discharge current is greater than the current threshold or the charging current is greater than the current threshold, the controller stops the operation of the voltage-controlled oscillator.

8. The wireless power transmission system for terminalless battery packs as described in claim 7, characterized in that, The controller obtains the discharge capacity and charging capacity based on the discharge current and the charging current; the terminalless battery pack further includes a voltage sampler, which is electrically connected to the battery, the bidirectional switch and the controller. The voltage sampler detects and transmits the discharge voltage of the terminalless battery pack when it is in the power supply state and the charging voltage of the terminalless battery pack when it is in the charging state to the controller. The controller calculates a first ratio of the battery voltage change to the discharge capacity when it is in the power supply state and a second ratio of the battery voltage change to the charging capacity when it is in the charging state.

9. The wireless power transmission system for terminalless battery packs as described in claim 8, characterized in that, The terminalless battery pack also includes a diode, a capacitor, and a voltage regulator. The diode is electrically connected to the battery and the bidirectional switch, the capacitor is electrically connected to the diode and the voltage regulator, and the voltage regulator is electrically connected to the battery and the controller. The voltage regulator supplies operating voltage to the controller. The controller determines whether the discharge voltage falls within the normal voltage range. When the controller determines that the discharge voltage falls within the normal voltage range, the diode is turned on, and the battery charges the capacitor and supplies power to the voltage regulator. When the controller determines that the discharge voltage does not fall within the normal voltage range, the diode is turned off, and the voltage regulator generates and outputs a backup voltage to the wireless power transmission system based on the voltage corresponding to the capacitor.

10. The wireless power transmission system for terminalless battery packs as described in claim 4, characterized in that, The terminalless battery pack also includes a trigger and a communicator. The trigger is electrically connected to the controller and transmits a trigger signal to the controller. The controller selectively operates in one of the power supply state and the charging state according to the trigger signal. The communicator is electrically connected to the controller, and the terminalless battery pack communicates wirelessly with the wireless load and the wireless charger through the communicator.

11. The wireless power transmission system for terminalless battery packs as described in claim 1, characterized in that, The first magnetic core wire group includes multiple first magnetic cores, and the second magnetic core wire group includes multiple second magnetic cores. The multiple first magnetic cores and the multiple second magnetic cores are connected in parallel or in series, respectively.

12. A wireless power transmission system for a terminalless battery pack, characterized in that, include: The first switching transformer includes a first magnetic core wire group and a third magnetic core wire group. The first magnetic core wire group and the third magnetic core wire group are separately arranged. The first magnetic core wire group belongs to the primary terminal of the first switching transformer, and the third magnetic core wire group belongs to the secondary terminal of the first switching transformer. When the first magnetic core wire group and the third magnetic core wire group are close to each other and in a closed state, electromagnetic coupling is generated. When the first magnetic core wire group and the third magnetic core wire group are far apart and in a separated state, there is no electromagnetic coupling. The second switching transformer includes a second magnetic core wire group and a fourth magnetic core wire group. The second magnetic core wire group and the fourth magnetic core wire group are separately arranged. The second magnetic core wire group belongs to the secondary terminal of the second switching transformer, and the fourth magnetic core wire group belongs to the primary terminal of the second switching transformer. When the second magnetic core wire group and the fourth magnetic core wire group are close to each other and in the closed state, electromagnetic coupling is generated. When the second magnetic core wire group and the fourth magnetic core wire group are far apart and in the separated state, there is no electromagnetic coupling. A terminalless battery pack includes a battery, a rectifier, and a driver. The battery is electrically connected to the rectifier and the driver. The first magnetic core wire group of the first switching transformer and the second magnetic core wire group of the second switching transformer are disposed in the terminalless battery pack. The first magnetic core wire group is electrically connected to the driver, and the second magnetic core wire group is electrically connected to the rectifier. A wireless load cell, wherein the third magnetic core wire group of the first switching transformer is disposed on the wireless load cell; and A wireless charger, wherein the fourth magnetic core wire group of the second switching transformer is disposed in the wireless charger; Specifically, when the terminalless battery pack is close to the wireless load device, the terminalless battery pack is in a power supply state, the first magnetic core wire group and the third magnetic core wire group of the first switching transformer are in the closed state and generate the electromagnetic coupling, and the battery provides first electrical energy to the wireless load device through the driver and the first switching transformer; when the terminalless battery pack is close to the wireless charger, the terminalless battery pack is in a charging state, the second magnetic core wire group and the fourth magnetic core wire group of the second switching transformer are in the closed state and generate the electromagnetic coupling, and the battery receives second electrical energy from the wireless charger through the second switching transformer and the rectifier.

13. The wireless power transmission system for terminalless battery packs as described in claim 12, characterized in that, The rectifier and the driver are configured independently of each other, and the first magnetic core wire group and the second magnetic core wire group are configured independently of each other.

14. The wireless power transmission system for terminalless battery packs as described in claim 12, characterized in that, The terminalless battery pack also includes a bypass circuit, which is electrically connected to the rectifier and assists the rectifier in voltage regulation.

15. The wireless power transmission system for terminalless battery packs as described in claim 12, characterized in that, The terminalless battery pack also includes a controller and a voltage-controlled oscillator (VCO). The controller is electrically connected to the VCO, and the VCO is electrically connected to the rectifier and the driver. The controller controls the VCO to output a first operating signal and a second operating signal to the driver and the rectifier, respectively. The driver operates according to the first operating signal, and the rectifier operates according to the second operating signal.

16. The wireless power transmission system for terminalless battery packs as described in claim 15, characterized in that, The controller controls the voltage-controlled oscillator to adjust the first operating signal according to the coupling state of the first magnetic core wire group and the third magnetic core wire group, and controls the voltage-controlled oscillator to adjust the second operating signal according to the coupling state of the second magnetic core wire group and the fourth magnetic core wire group.

17. The wireless power transmission system for terminalless battery packs as described in claim 15, characterized in that, The terminalless battery pack also includes a temperature sensor and a temperature regulator, which are electrically connected to the controller. The temperature sensor detects and transmits the temperature value of the battery to the controller. The controller determines whether the temperature value is within the allowable temperature range. When the controller determines that the temperature value is not within the temperature range, it controls the temperature regulator to start to adjust the temperature value.

18. The wireless power transmission system for a terminalless battery pack as described in claim 15, characterized in that, The terminalless battery pack also includes a current sensor, which is electrically connected to the battery, the rectifier, the driver, and the controller. The current sensor detects and transmits the discharge current of the terminalless battery pack when it is in the power supply state and the charging current of the terminalless battery pack when it is in the charging state to the controller. The controller compares the discharge current and the charging current with a current threshold. When the discharge current is greater than the current threshold or the charging current is greater than the current threshold, the controller stops the operation of the voltage-controlled oscillator.

19. The wireless power transmission system for terminalless battery packs as described in claim 18, characterized in that, The controller obtains the discharge capacity and the charging capacity based on the discharge current and the charging current; the terminalless battery pack further includes a voltage sampler, which is electrically connected to the battery, the rectifier, the driver, and the controller. The voltage sampler detects and transmits the discharge voltage of the terminalless battery pack when it is in the power supply state and the charging voltage of the terminalless battery pack when it is in the charging state to the controller. The controller calculates a first ratio of the battery voltage change to the discharge capacity in the power supply state and a second ratio of the battery voltage change to the charging capacity in the charging state.

20. The wireless power transmission system for a terminalless battery pack as described in claim 19, characterized in that, The terminalless battery pack further includes a diode, a capacitor, and a voltage regulator. The diode is electrically connected to the battery and the driver, the capacitor is electrically connected to the diode and the voltage regulator, and the voltage regulator is electrically connected to the battery and the controller. The voltage regulator supplies the operating voltage to the controller, and the controller determines whether the discharge voltage falls within the normal voltage range; When the controller determines that the discharge voltage falls within the normal voltage range, the diode is turned on, the battery charges the capacitor and supplies power to the voltage regulator; when the controller determines that the discharge voltage does not fall within the normal voltage range, the diode is turned off, and the voltage regulator generates and outputs a backup voltage to the wireless power transmission system based on the voltage corresponding to the capacitor.

21. The wireless power transmission system for terminalless battery packs as described in claim 15, characterized in that, The terminalless battery pack also includes a trigger and a communicator. The trigger is electrically connected to the controller and transmits a trigger signal to the controller. The controller selectively operates in one of the power supply state and the charging state according to the trigger signal. The communicator is electrically connected to the controller, and the terminalless battery pack communicates wirelessly with the wireless load and the wireless charger through the communicator.

22. The wireless power transmission system for a terminalless battery pack as described in claim 12, characterized in that, The first magnetic core wire group includes multiple first magnetic cores, the second magnetic core wire group includes multiple second magnetic cores, the third magnetic core wire group includes multiple third magnetic cores, and the fourth magnetic core wire group includes multiple fourth magnetic cores. The multiple first magnetic cores, multiple second magnetic cores, multiple third magnetic cores, and multiple fourth magnetic cores are connected in parallel or in series, respectively.

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