Method for managing high-power circuit, power battery and electronic device

Abstract

The application provides a high-power circuit management method, a power battery and an electronic device. The method is applied to a high-power circuit, the high-power circuit comprises a transistor branch and a relay branch, and the transistor branch and the relay branch are connected in parallel. The method comprises the following steps: when a charging instruction or a discharging instruction is received, determining a transistor of the transistor branch that needs to be turned on as a main power circuit according to a transmission power of the transistor branch and a first preset power; when it is detected that the transmission power is greater than or equal to a second preset power, locking all transistors of the transistor branch in an on state, and the second preset power is greater than the first preset power; when it is detected that the transmission power is greater than or equal to the second preset power and an absolute value of a working current of the high-power circuit is greater than a preset current threshold, turning on the relay branch as the main power circuit, and locking all transistors of the transistor branch to be all turned on, and the transistor branch is used as an auxiliary power circuit.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a management method for a high-power circuit, a power battery, and an electronic device. Background Technology

[0002] Currently, high-voltage power circuits are widely used in energy storage systems (200V-400VDC), high-power switching power supplies, and other equipment. These circuits face the challenge of on / off management. Commercially available high-voltage power circuits often manage on / off switching using specialized devices such as high-voltage MOSFETs, high-voltage IGBTs, and high-voltage relays. However, these specialized devices have significant drawbacks when used individually. For example, a single MOSFET solution results in higher internal resistance and power consumption with increasing voltage, requiring numerous parallel connections; a single relay solution cannot handle high-current turn-off and is prone to arcing and explosion during turn-off. These solutions still pose safety hazards when used to address the on / off management issues of high-voltage power circuits. Summary of the Invention

[0003] This application provides a management method for high-power circuits, a power battery, and an electronic device to reduce safety hazards when dealing with the on / off management of high-voltage power circuits.

[0004] In a first aspect, embodiments of this application provide a management method for a high-power circuit, applied to a high-power circuit, the high-power circuit comprising: a transistor branch and a relay branch, the transistor branch and the relay branch being connected in parallel, the method comprising:

[0005] Upon receiving a charging or discharging command, the transistors of the transistor branch that need to be turned on are determined based on the transmission power of the transistor branch and the first preset power, serving as the main power circuit.

[0006] When the transmitted power is detected to be greater than or equal to the second preset power, all transistors in the transistor branch are locked to the on state, and the second preset power is greater than the first preset power;

[0007] When the transmitted power is detected to be greater than or equal to the second preset power, and the absolute value of the operating current of the high-power circuit is greater than the preset current threshold, the relay branch is turned on as the main power circuit, and all transistors in the transistor branch are locked to be turned on, with the transistor branch serving as the auxiliary power circuit.

[0008] In some embodiments, the transistor branch includes a charging transistor and a discharging transistor. The step of determining which transistors in the transistor branch need to be activated as the main power circuit, based on the power output of the transistor branch and a first preset power, upon receiving a charging or discharging command, includes:

[0009] If the charging command is received, the charging transistor is turned on and used as the main power circuit;

[0010] If the discharge command is received, the discharge transistor is turned on and used as the main power circuit;

[0011] Upon receiving the charging command or the discharging command, if the power output of the high-power circuit is detected to be greater than or equal to the first preset power, the charging transistor and the discharging transistor are turned on, and the charging transistor and the discharging transistor are used as the main power circuit.

[0012] In some embodiments, after activating the relay branch as the main power circuit, the method further includes:

[0013] When the transmitted power is detected to be greater than or equal to the second preset power, and the absolute value of the operating current of the high-power circuit is less than the preset current threshold, the relay branch is shut down, and all transistors in the transistor branch are locked to be turned on, with the transistor branch serving as the main power circuit.

[0014] In some embodiments, after locking all transistors in the transistor branch to the on state, the method further includes:

[0015] When the transmitted power is detected to be less than the second preset power, the on-state lock of all transistors in the transistor branch is released.

[0016] In some embodiments, if the on-state of all transistors in the transistor branch is not locked, the method further includes:

[0017] If a preset shutdown signal is detected, all transistors in the transistor branch are turned off to shut down the transistor branch.

[0018] In some embodiments, the transistor branch includes a first self-locking unit, the relay branch includes a second self-locking unit, and the method further includes:

[0019] The transistors in the transistor branch are controlled to be in an open-locked state by the first self-locking unit.

[0020] The second self-locking unit controls the relays in the relay branch to be in an open-locked state.

[0021] Secondly, embodiments of this application provide a power battery, the power battery including: a lithium battery and a high-power circuit, the high-power circuit including: a transistor branch and a relay branch, the transistor branch and the relay branch being connected in parallel, the transistor branch and the relay branch being disposed at the positive terminal or the negative terminal of the lithium battery, the high-power circuit being used to execute the high-power circuit management method as described in any one of the embodiments of this application.

[0022] In some embodiments, the transistor branch includes: a first self-locking unit, a discharge transistor, and a charging transistor; the relay branch includes: a relay, a diode, and a second self-locking unit.

[0023] The source of the discharge transistor is connected to the positive terminal of the lithium battery, the drain of the discharge transistor is connected to the drain of the charging transistor, the source of the charging transistor serves as the external positive terminal of the high-power circuit, the gates of the discharge transistor and the charging transistor are both connected to the control unit through the first self-locking unit, the first switching terminal of the relay is connected to the source of the discharge transistor, the second switching terminal of the relay is connected to the source of the charging transistor, the first power supply terminal of the relay is connected to the cathode of the diode and the output terminal of the second self-locking unit, the second power supply terminal of the relay is connected to the anode of the diode, and the first and second input terminals of the second self-locking unit are both connected to the control unit.

[0024] In some embodiments, the high-power circuit further includes: a substrate, on which transistors of the transistor branch are mounted, and relays of the relay branch span the transistors of the transistor branch.

[0025] Thirdly, embodiments of this application provide an electronic device, characterized in that the electronic device includes a power battery as described in any one of the embodiments of this application.

[0026] This application provides a management method for a high-power circuit. The method is applied to a high-power circuit including a transistor branch and a relay branch connected in parallel. The method includes: upon receiving a charging or discharging command, determining which transistors in the transistor branch need to be activated based on the transmission power of the transistor branch and a first preset power, thus establishing a main power circuit; when the transmission power is detected to be greater than or equal to a second preset power, locking all transistors in the transistor branch to the activated state, where the second preset power is greater than the first preset power; when the transmission power is detected to be greater than or equal to the second preset power, and the absolute value of the operating current of the high-power circuit is greater than a preset current threshold, activating the relay branch as the main power circuit, and locking all transistors in the transistor branch to the activated state, thus establishing a secondary power circuit. In this method, by using the relay branch as the main high-power path and the transistor branch as the secondary path in high-speed road scenarios, and by combining software logic and hardware self-locking to prevent relay and transistor malfunctions, the stable operation of the high-power circuit is ensured. This solves safety issues such as arcing during shutdown, space occupation, and heat generation during the on / off management of high-voltage power circuits. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 A schematic diagram of a first type of high-power circuit provided in an embodiment of this application;

[0029] Figure 2 A schematic diagram of a second high-power circuit provided in an embodiment of this application;

[0030] Figure 3 A schematic flowchart illustrating a high-power circuit management method provided in an embodiment of this application;

[0031] Figure 4 This is a schematic diagram of the state changes of a high-power circuit provided in an embodiment of this application;

[0032] Figure 5 A circuit diagram of a power battery provided in an embodiment of this application;

[0033] Figure 6 This is a schematic diagram of a high-power circuit provided in an embodiment of this application.

[0034] Figure Labels

[0035] 100. High-power circuit; 101. Transistor branch; ZS1. First self-locking unit; Q1. Discharge transistor; Q2. Charging transistor; 102. Relay branch; K1. Relay; D1. Diode; ZS2. Second self-locking unit; 103. Control unit; 104. Substrate; 200. Power battery; 201. Lithium battery. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described below with reference to the accompanying drawings.

[0037] The terms "first" and "second," etc., used in the specification, claims, and drawings of this application are used to distinguish different objects, not to describe a specific order. 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 apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0038] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0039] It should be understood that in this application, "at least one (item)" means one or more, "more than one" means two or more, "at least two (items)" means two or three or more, and "and / or" is used to describe the relationship between related objects, indicating that there can be three relationships. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the related objects before and after are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0040] Please see Figure 1 , Figure 1This is a schematic diagram of a high-power circuit provided in an embodiment of this application. (As shown...) Figure 1 As shown, the high-power circuit 100 includes a transistor branch 101 and a relay branch 102, which are connected in parallel and are disposed at the positive terminal or the negative terminal of the lithium battery 201.

[0041] like Figure 1 As shown, transistor branch 101 includes a first self-locking unit ZS1, a discharge transistor Q1, and a charging transistor Q2, and relay branch 102 includes a relay K1, a diode D1, and a second self-locking unit ZS2. Both discharge transistor Q1 and charging transistor Q2 are PMOS transistors.

[0042] The source of discharge transistor Q1 is connected to the positive terminal of lithium battery 201, the drain of discharge transistor Q1 is connected to the drain of charging transistor Q2, the source of charging transistor Q2 serves as the external positive terminal of high-power circuit 100, the gates of discharge transistor Q1 and charging transistor Q2 are both connected to the control unit through the first self-locking unit ZS1, the first switching terminal of relay K1 is connected to the source of discharge transistor Q1, the second switching terminal of relay K1 is connected to the source of charging transistor Q2, the first power supply terminal of relay K1 is connected to the cathode of diode D1 and the output terminal of the second self-locking unit ZS2, the second power supply terminal of relay K1 is connected to the anode of diode D1, and the first and second input terminals of the second self-locking unit ZS2 are both connected to the control unit.

[0043] In another embodiment, such as Figure 2 As shown, the high-power circuit 100 can also be used for the negative electrode of the lithium battery 201. When the high-power circuit 100 is used for different electrodes, the corresponding components need to be changed accordingly. For example, the transistor can be replaced with an NMOS transistor.

[0044] Please see Figure 3 , Figure 3 This is a schematic flowchart illustrating a high-power circuit management method provided in an embodiment of this application. Figure 3 As shown, the specific steps of the high-power circuit management method include: S301-S303.

[0045] S301. Upon receiving a charging or discharging command, determine the transistors of the transistor branch that need to be turned on based on the transmission power of the transistor branch and the first preset power, and use them as the main power circuit.

[0046] For example, such as Figure 1As shown, when the power delivered by transistor branch 101 is less than the first preset power, only a portion of the transistors in transistor branch 101 need to be turned on as the main power circuit. For example, discharging transistor Q1 is turned on when a discharge command is received, and charging transistor Q2 is turned on when a charging command is received. Since the power delivered is low at this time, turning on only a portion of the transistors will prevent transistor overheating at the corresponding power level. However, when the power delivered by transistor branch 101 is greater than or equal to the first preset power, turning on only a portion of the transistors may cause transistor overheating. Therefore, both discharging transistor Q1 and charging transistor Q2 need to be turned on as the main power circuit to prevent transistor overheating.

[0047] S302. When the detected transmission power is greater than or equal to the second preset power, all transistors in the locked transistor branch are turned on, and the second preset power is greater than the first preset power.

[0048] For example, when the power delivered by the high-power circuit 100 (discharge power or charging power) is greater than or equal to the second preset power, the discharge transistor Q1 and the charging transistor Q2 will be in a holding state, and the high-power circuit 100 will enter a transistor holding state. In the transistor holding state, the discharge transistor Q1 and the charging transistor Q2 will be controlled by a hardware-designed holding self-locking circuit. At this time, if a software reset occurs, the drive signal of the control transistor will not be affected, ensuring that the discharge transistor Q1 and the charging transistor Q2 remain on.

[0049] S303. When the detected transmission power is greater than or equal to the second preset power and the absolute value of the operating current of the high power circuit is greater than the preset current threshold, the relay branch is turned on as the main power circuit, and all transistors in the transistor branch are turned on, with the transistor branch serving as the auxiliary power circuit.

[0050] For example, if the current supplied by the high-power circuit 100, which is in the transistor hold state (S5), exceeds a preset current threshold, the relay branch 102 will open and act as the main power circuit, while the transistor branch 101 acts as the auxiliary power circuit, and the high-power circuit 100 enters a steady state (S6). At this time, since the relay branch 102 is opened based on the transistor in the transistor branch 101 being in the hold state, the voltage difference across the relay K1 is very low, and the main power circuit is in a stable state, preventing dangerous conditions such as arcing. The addition of the relay branch 102 effectively alleviates problems such as overheating that easily occur in the transistor branch 101 during high-power transmission.

[0051] In high-power transmission scenarios, even with the second self-locking unit ZS2, relay K1 may still experience intermittent disconnection (e.g., due to vibration), causing relay branch 102 to open. Because of the presence of transistor branch 101 as an auxiliary power circuit, even if relay K1 intermittently disconnects, transistor branch 101 can take over as the main power circuit from relay branch 102, without affecting the power supply to the high-power circuit 100, thus preventing arcing and explosions.

[0052] This application provides a management method for a high-power circuit. The method is applied to a high-power circuit including a transistor branch and a relay branch connected in parallel. The method includes: upon receiving a charging or discharging command, determining which transistors in the transistor branch need to be activated based on the transmission power of the transistor branch and a first preset power, thus establishing a main power circuit; when the transmission power is detected to be greater than or equal to a second preset power, locking all transistors in the transistor branch to the activated state, where the second preset power is greater than the first preset power; when the transmission power is detected to be greater than or equal to the second preset power, and the absolute value of the operating current of the high-power circuit is greater than a preset current threshold, activating the relay branch as the main power circuit, and locking all transistors in the transistor branch to the activated state, thus establishing a secondary power circuit. In this method, by using the relay branch as the main high-power path and the transistor branch as the secondary path in high-speed road scenarios, and by combining software logic and hardware self-locking to prevent relay and transistor malfunctions, the stable operation of the high-power circuit is ensured. This solves safety issues such as arcing during shutdown, space occupation, and heat generation during the on / off management of high-voltage power circuits.

[0053] To more clearly illustrate the technical solution of this application, the technical solution of this application will be described below through specific embodiments. It should be noted that the specific embodiments are used to expand the description of the technical solution of this application, and are not intended to limit this application.

[0054] In some embodiments, transistor branch 101 includes a charging transistor Q2 and a discharging transistor Q1. Upon receiving a charging command or a discharging command, the transistors of transistor branch 101 that need to be turned on are determined based on the power output of transistor branch 101 and a first preset power, serving as the main power circuit. This includes: if a charging command is received, turning on charging transistor Q2 and using charging transistor Q2 as the main power circuit; if a discharging command is received, turning on discharging transistor Q1 and using discharging transistor Q1 as the main power circuit; and after receiving a charging command or a discharging command, if it is detected that the power output of high-power circuit 100 is greater than or equal to the first preset power, turning on charging transistor Q2 and discharging transistor Q1 and using charging transistor Q2 and discharging transistor Q1 as the main power circuit.

[0055] For example, the initial state of the high-power circuit 100 is the power-off state (S1). In the power-off state, both the transistor branch 101 and the relay branch 102 are in the off state. The power-off state (S1) occurs when power is off, protection is activated, or there is a short circuit.

[0056] like Figure 1 As shown, when the high-power circuit 100 receives a discharge command (button command or software command), the high-power circuit 100 enters the output-only state (S2), turning on the discharge transistor Q1. In the output-only state (S2), the main power circuit of the high-power circuit 100 allows current to flow from B+ to P+ and from P- to B-. In the output-only state (S2), if an overcurrent discharge protection or shutdown occurs, it will return to the shutdown state (S1).

[0057] like Figure 1 As shown, when the high-power circuit 100 receives a charging command (charger insertion or software command), the high-power circuit 100 enters the on-only input state (S3), turning on the charging transistor Q2. In the on-only input state (S3), the main power circuit of the high-power circuit 100 allows current to flow from P+ to B+ and from B- to P-. In the on-only input state (S3), if charging overcurrent protection, charger removal, or power-off occurs, it will return to the power-off state (S1).

[0058] In both the output-only (S2) and input-only (S3) states, when the power output (discharge or charge) of the high-power circuit 100 exceeds the first preset power, both the discharge transistor Q1 and the charge transistor Q2 are fully turned on, and the high-power circuit 100 enters the fully-on transistor state (S4), ensuring the normal operation of the main power circuit. In the fully-on transistor state (S4), the main power circuit allows current to flow from P+ to B+, from B+ to P+, from B- to P-, and from P- to B-. If a protection (charging, discharging) or shutdown condition occurs in the fully-on transistor state (S4), the circuit will return to the shutdown state (S1) to ensure no dangerous operating conditions occur.

[0059] In some embodiments, after turning on the relay branch 102 as the main power circuit, the method further includes: when the transmitted power is detected to be greater than or equal to a second preset power and the absolute value of the operating current of the high power circuit 100 is less than a preset current threshold, turning off the relay branch 102, locking all transistors in the transistor branch 101 to be turned on, and the transistor branch 101 to be the main power circuit.

[0060] For example, when the high-power circuit 100 is in a steady state (S6), the relay branch 102 acts as the main power circuit. However, when the absolute value of the operating current of the high-power circuit 100 is less than a preset current threshold, the high-power circuit 100 has actually exited the high-power transmission state and can return to the transistor holding state (S5). In the transistor holding state (S5), the current transmission requirement can be met by the transistor branch 101, and it can also further support actions such as autonomous protection. Therefore, it is necessary to exit the self-locking state of the relay branch 102 and turn off the relay K1 of the relay branch 102, thereby improving the flexibility of the relay K1 in performing autonomous protection.

[0061] In some embodiments, after locking all transistors in transistor branch 101 to the on state, the method further includes: when it is detected that the power delivered is less than a second preset power, releasing the on state lock of all transistors in transistor branch 101.

[0062] For example, when the power delivered by the high-power circuit 100 in the transistor hold state (S5) further decreases, i.e., the power delivered is less than the second preset power, the high-power circuit 100 can return to the transistor fully on state (S4). In the transistor fully on state (S4), the transistors in the transistor branch 101 can withstand the turn-off effect of the delivered power, and it is necessary to release the on-state lock applied to the transistors in the transistor hold state (S5) to improve the flexibility of the autonomous protection of the transistor branch 101.

[0063] In some embodiments, if the on state of all transistors in transistor branch 101 is not locked, the method further includes: if a preset off signal is detected, turning off all transistors in transistor branch 101 to turn off transistor branch 101.

[0064] For example, the preset shutdown signals include: power-off signal, short-circuit protection signal and overload protection signal, etc. When the control unit detects such signals, it can control the high-power circuit 100 to shut down.

[0065] In some embodiments, transistor branch 101 includes a first self-locking unit ZS1, and relay branch 102 includes a second self-locking unit ZS2. The method further includes: controlling the transistor of transistor branch 101 to be in an open-locked state through the first self-locking unit ZS1; and controlling the relay K1 of relay branch 102 to be in an open-locked state through the second self-locking unit ZS2.

[0066] For example, the transistor in transistor branch 101 is controlled to be in an open-locked state by the first self-locking unit ZS1. The transistor is controlled by the first self-locking unit ZS1 in the hardware design. At this time, if the control program of the control unit is reset, the drive signal of the control transistor will not be affected, ensuring that transistor branch 101 will not be turned off. The second self-locking unit ZS2 is to ensure that the drive signal of relay branch 102 will not be affected.

[0067] In one specific embodiment, please refer to Figure 4 , Figure 4 This illustration shows a schematic diagram of the state changes of a high-power circuit according to an embodiment of this application. Figure 4 As shown, the states of the high-power circuit 100 include: power off state (S1), output-only state (S2), input-only state (S3), transistor fully on state (S4), transistor hold state (S5), and steady state (S6).

[0068] like Figure 4 As shown, in the power-off state (S1), both transistor branch 101 and relay branch 102 are in the off state.

[0069] In the output-only state (S2) or input-only state (S3), only some transistor branches 101 (such as discharge transistor Q1 or charge transistor Q2) are turned on.

[0070] In the fully on state (S4), all transistors in transistor branch 101 are turned on.

[0071] In the transistor holding state (S5), transistor branch 101 enters the holding state (i.e., the unlocked state).

[0072] In steady state (S6), both transistor branch 101 and relay branch 102 are in the ON state.

[0073] When the transistors are in the fully on state (S4), if the discharge current exceeds the preset current threshold (or the second preset power), the first self-locking unit ZS1 will activate, locking the on state of all transistors in the transistor branch 101, preventing the transistors from being directly turned off. The high-power circuit 100 then switches to the transistor hold state (S5).

[0074] When the high-power circuit 100 is in the transistor holding state (S5), if the operating current (absolute value) continues to increase and exceeds the preset current threshold, the relay branch 102 is turned on, and the high-power circuit 100 enters a steady state (S6).

[0075] When the high-power circuit 100 is in steady state (S6), the operating current (absolute value) decreases below the preset current threshold, the relay branch 102 is closed, and the high-power circuit 100 returns to the transistor holding state (S5).

[0076] When the high-power circuit 100 is in the fully open state of the transistor (S4), only the transistor branch 101 is open, which can provide arbitrary protection, such as short-circuit protection.

[0077] When the high-power circuit 100 is in the transistor holding state (S5), only the transistor branch 101 is still open. However, due to the action of the first self-locking unit ZS1, the transistor cannot be directly turned off, thus preparing in advance for the relay branch 102 to operate.

[0078] When the high-power circuit 100 is in a steady state (S6), due to the action of the transistor branch 101, the voltage across the relay branch 102 is almost zero. Therefore, the relay branch 102 can switch on and off at any time without arcing. At the same time, since the transistor branch 101 is forcibly opened by the first self-locking unit ZS1, even if the relay branch 102 experiences a brief interruption (such as due to vibration), it will not affect the power supply of the entire high-power circuit 100.

[0079] The state switching of the entire high-power circuit 100 is controlled by logic, as follows: Figure 4 The state change logic shown is switched in an orderly manner, realizing reliable management of the high-voltage, high-current power path.

[0080] This application also provides a power battery; please refer to [link / reference]. Figure 5 , Figure 5 A circuit diagram of a power battery 200 provided in an embodiment of this application is shown.

[0081] like Figure 5 As shown, the power battery 200 includes a lithium battery 201 and a high-power circuit 100. The high-power circuit 100 includes a transistor branch 101 and a relay branch 102, which are connected in parallel. The transistor branch 101 and the relay branch 102 are disposed at the positive terminal or the negative terminal of the lithium battery 201. The high-power circuit 100 is used to execute the management method of the high-power circuit 100 as described in any one of the embodiments of this application.

[0082] In some embodiments, such as Figure 5As shown, transistor branch 101 includes a first self-locking unit ZS1, a discharge transistor Q1, and a charging transistor Q2. Relay branch 102 includes a relay K1, a diode D1, and a second self-locking unit ZS2. The source of discharge transistor Q1 is connected to the positive terminal of lithium battery 201, the drain of discharge transistor Q1 is connected to the drain of charging transistor Q2, the source of charging transistor Q2 serves as the external positive terminal of high-power circuit 100, the gates of discharge transistor Q1 and charging transistor Q2 are both connected to the control unit through the first self-locking unit ZS1, the first switching terminal of relay K1 is connected to the source of discharge transistor Q1, the second switching terminal of relay K1 is connected to the source of charging transistor Q2, the first power supply terminal of relay K1 is connected to the cathode of diode D1 and the output terminal of the second self-locking unit ZS2, the second power supply terminal of relay K1 is connected to the anode of diode D1, and the first and second input terminals of the second self-locking unit ZS2 are both connected to the control unit. In some embodiments, please refer to... Figure 6 , Figure 6 A schematic diagram of a high-power circuit provided in an embodiment of this application is shown.

[0083] like Figure 6 As shown, the high-power circuit 100 also includes: a substrate, transistors of transistor branch 101 mounted on the substrate, and relay K1 of relay branch 102 spanning the transistors of transistor branch 101 (discharge transistor Q1 and charge transistor Q2).

[0084] For example, such as Figure 5 As shown, relay K1 is mounted on a metal support, which is a metal material of a specific shape (L-shaped portion). Relay K1 and the metal support form a relay K1 module. The metal support acts as both a conductor carrying current and a bracket supporting the relay K1. The relay K1 module is then mounted onto a PCB substrate, spanning across the transistor. This layout improves the space utilization of the PCB. Furthermore, following the principle of shortest current path, this stacked structure ensures consistent current flow between the transistor and relay K1, guaranteeing current sharing and temperature rise.

[0085] This application also provides an electronic device, which includes a power battery as described in any of the embodiments of this application.

[0086] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A management method for high-power circuits, characterized in that, Applied to a high-power circuit, the high-power circuit comprising: a transistor branch and a relay branch, wherein the transistor branch and the relay branch are connected in parallel, the method comprising: Upon receiving a charging or discharging command, the transistors of the transistor branch that need to be turned on are determined based on the transmission power of the transistor branch and the first preset power, serving as the main power circuit. When the transmitted power is detected to be greater than or equal to the second preset power, all transistors in the transistor branch are locked to the on state, and the second preset power is greater than the first preset power; When the transmitted power is detected to be greater than or equal to the second preset power, and the absolute value of the operating current of the high-power circuit is greater than the preset current threshold, the relay branch is turned on as the main power circuit, and all transistors in the transistor branch are locked to be turned on, with the transistor branch serving as the auxiliary power circuit. After the relay branch is turned on as the main power circuit, the method further includes: when the transmitted power is detected to be greater than or equal to the second preset power and the absolute value of the operating current of the high power circuit is less than the preset current threshold, the relay branch is turned off, and all transistors of the transistor branch are turned on, with the transistor branch serving as the main power circuit. After locking all transistors in the transistor branch to the on state, the method further includes: when the delivered power is detected to be less than the second preset power, releasing the on state lock of all transistors in the transistor branch; The transistor branch includes a first self-locking unit, and the relay branch includes a second self-locking unit. The method further includes: controlling the transistor of the transistor branch to be in an open-locked state through the first self-locking unit; only the transistor branch is open, but because the first self-locking unit is activated, the transistor cannot be directly turned off, thus preparing in advance for the operation of the relay branch; and controlling the relay of the relay branch to be in an open-locked state through the second self-locking unit.

2. The management method for high-power circuits as described in claim 1, characterized in that, The transistor branch includes a charging transistor and a discharging transistor. Upon receiving a charging or discharging command, the transistors in the transistor branch that need to be activated are determined based on the transmission power of the transistor branch and a first preset power, serving as the main power circuit. This includes: If the charging command is received, the charging transistor is turned on and used as the main power circuit; If the discharge command is received, the discharge transistor is turned on and used as the main power circuit; Upon receiving the charging command or the discharging command, if the power output of the high-power circuit is detected to be greater than or equal to the first preset power, the charging transistor and the discharging transistor are turned on, and the charging transistor and the discharging transistor are used as the main power circuit.

3. The management method for high-power circuits as described in claim 1, characterized in that, If the on-state of all transistors in the transistor branch is not locked, the method further includes: If a preset shutdown signal is detected, all transistors in the transistor branch are turned off to shut down the transistor branch.

4. A power battery, characterized in that, The power battery includes a lithium battery and a high-power circuit. The high-power circuit includes a control unit, a transistor branch, and a relay branch. The transistor branch and the relay branch are connected in parallel and are located at the positive terminal or the negative terminal of the lithium battery. The high-power circuit is used to execute the management method of the high-power circuit as described in any one of claims 1 to 3.

5. The power battery as described in claim 4, characterized in that, The transistor branch includes: a first self-locking unit, a discharge transistor, and a charging transistor; the relay branch includes: a relay, a diode, and a second self-locking unit. The source of the discharge transistor is connected to the positive terminal of the lithium battery, the drain of the discharge transistor is connected to the drain of the charging transistor, the source of the charging transistor serves as the external positive terminal of the high-power circuit, the gates of the discharge transistor and the charging transistor are both connected to the control unit through the first self-locking unit, the first switching terminal of the relay is connected to the source of the discharge transistor, the second switching terminal of the relay is connected to the source of the charging transistor, the first power supply terminal of the relay is connected to the cathode of the diode and the output terminal of the second self-locking unit, the second power supply terminal of the relay is connected to the anode of the diode, and the first and second input terminals of the second self-locking unit are both connected to the control unit.

6. The power battery as described in claim 4, characterized in that, The high-power circuit further includes: a substrate, on which the transistors of the transistor branch are mounted, and the relays of the relay branch span the transistors of the transistor branch.

7. An electronic device, characterized in that, The electronic device includes a power battery as described in any one of claims 4 to 6.

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