CN117917837A - Switch structure of battery charging and discharging circuit and method for controlling battery charging and discharging circuit - Google Patents

Abstract

The invention provides a switch structure for a battery charging and discharging circuit, which comprises: a main switch for the main circuit, comprising a first switch connected in series between the positive electrode of the power supply and the positive electrode of the battery and a second switch connected in series between the negative electrode of the power supply and the negative electrode of the battery; and a secondary switch for the pre-charge loop comprising a third switch connected in series between the positive power supply and the positive battery and a fourth switch connected in series between the negative power supply and the negative battery. The invention also proposes a method comprising three operations. The first operation includes: the main driving mechanism drives the secondary driving mechanism to move towards the connection direction so as to connect the secondary switch; the main driving mechanism drives the main switch to move towards the on direction so as to switch on the main switch; the primary driving mechanism drives the secondary driving mechanism to move towards the opening direction, so that the secondary switch is opened. The second operation includes: the main driving mechanism drives the main switch to turn on. The third operation includes: the primary driving mechanism drives the secondary driving mechanism to move towards the on direction so as to switch on the secondary switch.

Description

Switch structure of battery charging and discharging circuit and method for controlling battery charging and discharging circuit

Technical Field

The invention provides a switch structure for a battery charging and discharging circuit and a method for controlling the battery charging and discharging circuit.

Background

With the continuous pushing of the double-carbon strategy, new energy power generation is greatly developed, but the defects of the new energy power generation are the problems of instability, time mismatch, energy waste and the like. In order to ensure the stability of the generated energy of new energy, and not wasting the uneasy electric power, the electrochemical energy storage is used as an important matching technology and is also increasingly applied to the electrochemical energy storage with the battery as the main component, and the electrochemical energy storage has a wide development prospect.

In current electrochemical energy storage power stations, the cells are connected in series to form a battery pack and then connected in series into battery clusters, and each battery cluster has a high voltage box to control the charging of the cells. Typically a manual disconnect switch would be included, two main loop contactors and a series resistance pre-charge loop contactor. The positive electrode and the negative electrode are protected by a fuse in a short circuit way.

The pre-charge circuit of the prior art protects the main contactor and the capacitor and eliminates the circulation between the battery clusters. The precharge loop closing timing of the energy conversion system (PCS) is calculated according to the size and power of the capacitor. When the battery is dangerous, a Battery Management System (BMS) may command quick opening (several tens of ms).

However, when the energy storage power station in the prior art needs to charge the battery pack, the operation steps are as follows: 1. switching on a pre-charging loop; 2. switching on the main loop; 3. the pre-charge circuit is disconnected and charged through the main circuit. And then the battery pack is in a charging state, if the battery pack is required to stop charging, the step 4 is required to be carried out: the main loop is disconnected.

In the process, the manual disconnecting switch, the two main loop contactors and the one pre-charging loop contactor need to be controlled respectively, so that the mechanism is complex and the process is complex. There is therefore a need for an improved electrical control mechanism to more simply and reliably implement the above functions.

Disclosure of Invention

In view of the above-mentioned problems and needs, the present disclosure proposes a novel technical solution, which solves the above-mentioned problems and brings about other technical effects due to the following technical features.

The invention proposes a switch structure for a battery charge-discharge circuit comprising a main circuit and a pre-charge circuit connected in parallel between a power supply and a battery, the switch structure comprising: a main switch for the main circuit, the main switch comprising a first switch connected in series between the positive electrode of the power supply and the positive electrode of the battery and a second switch connected in series between the negative electrode of the power supply and the negative electrode of the battery; and a secondary switch for the pre-charge circuit, the secondary switch comprising a third switch connected in series between the positive power supply and the positive battery and a fourth switch connected in series between the negative power supply and the negative battery.

Further preferably, the first switch is linked with the second switch to synchronously switch on or off the main circuit; and the third switch and the fourth switch are linked to synchronously switch on or off the pre-charging loop.

Further preferably, the switch structure further includes: a main driving mechanism for driving the main switch to be turned on or off, and a sub driving mechanism for driving the sub switch to be turned on or off.

Further preferably, the main driving mechanism further comprises an intermediate driving part; and the intermediate driving part is arranged to drive the secondary driving mechanism to switch on the secondary switch in the process that the primary driving mechanism moves the primary switch towards the switch-on direction and is not switched on.

Further preferably, the secondary drive mechanism comprises an energy storage component and is arranged to release energy storage after the primary switch has been turned on, to turn off the secondary switch.

Further preferably, the primary drive mechanism further comprises an energy storage component arranged to: the energy storage component is stored energy in a first stage of movement of the main driving mechanism in a direction of turning on the main switch, and releases energy storage in a second stage of movement of the main driving mechanism in a direction of turning on the main switch so as to realize turning on of the main switch; and in a first phase of movement of the main drive mechanism in a direction to open the main switch, the energy storage component is stored energy, and in a second phase of movement of the main drive mechanism in a direction to open the main switch, the energy storage component releases the stored energy to effect opening of the main switch.

Further preferably, the primary drive mechanism further comprises a locking member arranged to selectively lock the energy storage member in an energy storage position; and, after the locking member is unlocked, the energy storage member releases its energy to move the primary drive mechanism in a direction to open the primary switch.

Further preferably, the switch structure further includes: a main sensor for indicating an on state or an off state of the main switch; a sub sensor for indicating an on state or an off state of the sub switch; and/or a locking sensor for indicating that the locking member locks the energy storage member.

The present invention also proposes a method for controlling a battery charge-discharge circuit comprising a switch structure as described above, the method comprising performing one of the following operations according to a control command: a first operation comprising: step S11 is executed according to the control command: the main driving mechanism drives the secondary driving mechanism to move towards the on direction so as to switch on the secondary switch; step S12 is executed according to the control command: the main driving mechanism drives the main switch to move towards the on direction so as to enable the main switch to be on; step S13 is executed according to the control command: the main driving mechanism drives the secondary driving mechanism to move towards the disconnection direction so as to disconnect the secondary switch; a second operation comprising: step S21 is executed according to the control command: the main driving mechanism drives the main switch to be turned on; a third operation comprising: step S31 is executed according to the control command: the primary driving mechanism drives the secondary driving mechanism to move towards the on direction so as to enable the secondary switch to be on.

Further preferably, before step S11, a judging step S110 is further included to judge whether the primary switch and the secondary switch are both turned off, if yes, step S11 is executed, otherwise, the process is ended; before step S12, a determining step S120 is further included to determine whether the secondary switch is turned on, if yes, step S12 is performed, otherwise, a determining step S121 is further performed to determine whether the primary switch and the secondary switch are both turned off, if yes, the primary driving mechanism drives the primary switch to move in the on direction, so that the primary switch is turned on, and if not, the primary switch is ended.

Further preferably, step S11 further includes: locking the energy storage component before the primary drive mechanism drives the secondary drive mechanism to move in the on direction and the primary switch is about to be turned on, so that the energy storage component stores energy and prevents the primary drive mechanism from moving in the off direction; step S13 further includes: locking the energy storage component to store energy before the primary drive mechanism drives the secondary drive mechanism to move in an opening direction and the primary switch has not been opened; and the first operation further comprises: step S14 is executed according to the control command: and the energy storage component releases energy stored by the energy storage component, so that the main driving mechanism drives the main switch to move towards the opening direction, and the main switch is opened.

Further preferably, the method further includes a determining step S140 before the step S14 to determine whether the primary switch is turned on, if yes, the step S14 is executed, otherwise, the determining step S141 is further executed to determine whether the secondary switch is turned on, if yes, the primary driving mechanism drives the secondary driving mechanism to move in the off direction, so that the secondary switch is turned off, and otherwise, the method is ended.

Further preferably, step S21 includes: the main driving mechanism sequentially enables the secondary switch to be on, enables the main switch to be on and enables the secondary switch to be off, and after the main switch is on, the main driving mechanism drives the secondary driving mechanism to enable the energy storage component to store energy in the process of moving towards the opening direction.

Further preferably, before step S21, a determining step S210 is further included to determine whether the primary switch and the secondary switch are both turned off, if yes, step S21 is performed, otherwise, a determining step S211 is further performed to determine whether the secondary switch is turned on, if yes, the primary driving mechanism drives the primary switch to turn on, and if not, the primary switch is ended.

Further preferably, the second operation further includes: step S22 is executed according to the control command: the energy storage component is caused to release its energy storage to cause the primary drive mechanism 50 to drive the primary switch in an off direction to cause the primary switch to be turned off.

Further preferably, before step S22, a determining step S220 is further included to determine whether the primary switch is turned on, if yes, step S22 is performed, otherwise, a determining step S221 is further performed to determine whether the secondary switch is turned on, if yes, the primary driving mechanism drives the secondary driving mechanism to move in the off direction, so that the secondary switch is turned off, and otherwise, the process is ended.

Further preferably, before step S31, a determining step S310 is further included to determine whether the primary switch and the secondary switch are both turned off, if so, step S31 is performed, otherwise, the process is ended.

Further preferably, step S31 further includes: locking the energy storage component before the primary drive mechanism drives the secondary drive mechanism to move in the on direction and the primary switch is about to be turned on, so that the energy storage component stores energy and prevents the primary drive mechanism from moving in the off direction; and the third operation further comprises: step S32 is executed according to the control command: the energy storage component is caused to release its energy storage so that the primary drive mechanism 50 drives the secondary drive mechanism in the opening direction to open the secondary switch.

Further preferably, the method further includes a determining step S320 before the step S32 to determine whether the secondary switch is turned on, if yes, the step S32 is executed, otherwise, the determining step S321 is further executed to determine whether the primary switch is turned on, if yes, the primary driving mechanism drives the primary switch to turn off, otherwise, the method is ended.

Further preferably, a predetermined time delay is spaced between step S11 and step S12.

Drawings

Fig. 1 is a circuit diagram of a switch structure according to the present invention;

FIG. 2 is a schematic illustration of a primary drive mechanism and a secondary drive mechanism according to a preferred embodiment of the present invention;

Fig. 3 is a first operation schematic diagram of a method of controlling a battery charge-discharge circuit according to a preferred embodiment of the present invention;

Fig. 4 is a second operation schematic diagram of a method of controlling a battery charge-discharge circuit according to a preferred embodiment of the present invention;

Fig. 5 is a third operational schematic diagram of a method of controlling a battery charge-discharge circuit according to a preferred embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the technical solutions of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings of the specific embodiments of the present disclosure. Like reference numerals in the drawings denote like parts. It should be noted that the described embodiments are some, but not all embodiments of the present disclosure. All other embodiments, which can be made by one of ordinary skill in the art without the need for inventive faculty, are within the scope of the present disclosure, based on the described embodiments of the present disclosure.

Possible implementations within the scope of the present disclosure may have fewer components, have other components not shown in the drawings, different components, differently arranged components, differently connected components, etc., than the examples shown in the drawings. Furthermore, two or more of the elements in the figures may be implemented in a single element or a single element shown in the figures may be implemented as multiple separate elements.

Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The terms "first," "second," and the like in the description and in the claims, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Where the number of components is not specified, the number of components may be one or more; likewise, the terms "a," "an," "the," and the like do not necessarily denote a limitation of quantity. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "mounted," "configured," "connected," or "connected" and the like are not limited to physical or mechanical mounting, configuration, connection, but may include electrical mounting, configuration, connection, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to denote relative positional relationships when the apparatus is in use or positional relationships shown in the drawings, and when the absolute position of the object to be described is changed, the relative positional relationships may be changed accordingly.

In order to solve the problems of complicated and unreliable control mechanism of the charge-discharge circuit in the prior art, the invention provides an improved switch structure of a battery charge-discharge circuit. The battery charge-discharge circuit includes a main circuit and a pre-charge circuit connected in parallel between a power source (typically a dc power source) and a battery. It should be appreciated that although the invention is described hereinafter primarily with respect to battery charging operations, the main circuit may implement charging or discharging operations on the battery (see the second operation hereinafter).

According to a preferred embodiment of the present invention, as shown in fig. 1, the switch structure includes: a main switch for the main circuit, comprising a first switch 11 connected in series between the power supply positive bat+ and the battery positive dc+ and a second switch 12 connected in series between the power supply negative BAT-and the battery negative DC-; and a secondary switch for the pre-charge loop, comprising a third switch 13 connected in series between the power supply positive bat+ and the battery positive dc+ and a fourth switch 14 connected in series between the power supply negative BAT-and the battery negative DC-. In addition, a pre-charge resistor R1 is connected in series in the pre-charge circuit, so that the pre-charge circuit has a small current only when being turned on, and the main circuit is turned on (as described later) when the pre-charge circuit is turned off, so that breaking arc is not generated, and damage to electrical elements is prevented.

The switch structure of the invention eliminates a manual isolating switch, two main loop contactors and a pre-charging loop contactor in the charge-discharge circuit in the prior art, and optimizes the on and off operations of both the main loop and the pre-charging loop by simplifying the switch structure so as to provide more reliable and flexible control for the charge-discharge process of the battery.

Further preferably, the first switch 11 is linked with the second switch 12 to switch on or off the main circuit synchronously; and the third switch 13 is linked with the fourth switch 14 to synchronously turn on or off the precharge circuit. The linkage between such switches may be accomplished by any suitable mechanical mechanism, electrical component, etc.

Referring to fig. 2, the switching structure according to the preferred embodiment of the present invention may further include: a primary drive mechanism 20 for driving the primary switch on or off, and a secondary drive mechanism 30 for driving the secondary switch on or off. Although not shown in detail, the main drive mechanism 20 may include a dial 21 driven by a motor or any other suitable power source, including manual driving by a user, and the dial 21 may connect and drive the first switch 11 and the second switch 12 (not specifically shown in FIG. 2). For example, the first switch 11 and the second switch 12 may be implemented as moving contacts that move with the turntable 21, so that when the turntable 21 is rotated from an initial position through a certain angle (e.g. in the counterclockwise direction a in the figure), the first switch 11 and the second switch 12 will simultaneously switch on the stationary contacts on the main circuit; accordingly, if the turntable 21 is rotated in the opposite direction by a certain angle, the first switch 11 and the second switch 12 will be simultaneously turned off. Similarly, the secondary drive mechanism 30 may also be implemented as a rotary disk, and the third switch 13 and the fourth switch 14 are implemented as moving contacts that move with the rotary disk and contact or separate from the stationary contacts on the priming circuit.

Further preferably, the main drive mechanism 20 may also comprise an intermediate drive 40, which may be implemented for example as a push rod extending from the turntable 21. Further, the turntable of the secondary drive mechanism 30 includes a first arm 31 and a second arm 32 extending therefrom. Thus, when the turntable 21 drives the intermediate driving part 40 thereon to rotate along the direction a, the intermediate driving part 40 can push the first arm 31 to drive the secondary driving mechanism 30 along the clockwise direction B so as to turn on the secondary switch; when the turntable 21 drives the intermediate driving part 40 thereon to rotate in a direction opposite to the direction a, the intermediate driving part 40 can push the second arm 32 to drive the secondary driving mechanism 30 to rotate in a direction opposite to the direction B, so as to turn off the secondary switch.

For convenience of description, hereinafter, for the main driving mechanism 20, the counterclockwise direction a will be referred to as the on direction of the main switch, and the opposite counterclockwise direction will be referred to as the off direction of the main switch; accordingly, the clockwise direction B is the on direction of the secondary switch and the opposite counterclockwise direction is the off direction of the secondary switch for the secondary drive mechanism 30. By providing and further designing the intermediate drive 40 and the positional relationship (in particular angular positional relationship) of the arms 31 and 32, the primary switch and the secondary switch by means of such a mechanism, the intermediate drive 40 can be realized such that the intermediate drive 40 can drive the secondary drive 30 to switch on during the movement of the primary switch in the on direction by the primary drive 20, which has not yet been switched on. That is, for example, according to a control command from the BMS, the sub-switch may be turned on before the main switch, i.e., the pre-charge circuit is turned on before the main circuit, during the movement of the main driving mechanism 20 in the direction in which the main switch is turned on.

It should be understood that, in this context, "movement of the main drive mechanism in a direction to turn the main switch on" and "movement of the main drive mechanism in a direction to turn the main switch off" do not mean that the main switch must be turned on or off, but rather that the main drive mechanism has such a tendency to move.

It should be understood that fig. 2 is a preferred example of a primary drive mechanism 20 and a secondary drive mechanism 30 according to the principles of the present invention, and that the primary drive mechanism 20 and the secondary drive mechanism 30 may have various embodiments, such as implemented by a linkage structure, a gear structure, etc., so long as they achieve the operational relationship therebetween described above and the specific operation for the primary switch and the secondary switch described below. Thus, the method is applicable to a variety of applications. Other implementations consistent with this principle are also within the scope of the invention.

Further preferably, the primary drive mechanism 20 may be implemented as a hands-free, manually operated mechanism, which may include an energy storage component 50, the energy storage component 50 being configured to: the energy storage member 50 can be charged during a first phase of movement of the main drive mechanism 20 in a direction to switch on the main switch (direction a described above), and the energy storage member 50 can release the stored energy during a second phase of movement of the main drive mechanism 20 in a direction to switch on the main switch, the released stored energy causing the dial 21 to move further in a direction to switch on the main switch to effect switching on of the main switch.

In the preferred embodiment of fig. 2, the energy storage component 50 is implemented, for example, as a pair of springs, each of which is pivotally connected at one end to a frame or housing (not shown) of the switch structure and at the other end to a suitable location on the turntable 21. Thus in a first phase of movement of the main drive mechanism 20 by the drive motor or manual operation of the user in the direction of turning on the main switch, the pair of springs will be compressed and release their stored elastic potential energy after passing their spring dead points (i.e. the second phase) to move the dial 21 further in the direction of turning on the main switch and finally achieve turning on of the main switch, and no further driving of the drive motor or manual operation of the user is required in this second phase. It should be appreciated that the energy storage component 50 may also have other suitable embodiments, such as pneumatic, hydraulic energy storage mechanisms, etc., in accordance with the principles described above.

Similarly, the energy storage component 50 may be charged during a first phase of movement of the main drive mechanism 20 in a direction to open the main switch, and the energy storage component 50 may release the stored energy during a second phase of movement of the main drive mechanism 20 in a direction to open the main switch, the released stored energy causing the dial 21 to move further in a direction to open the main switch to effect opening of the main switch.

It is further preferred that the primary drive mechanism 20 also include a locking member 60 configured to selectively lock the energy storage member 50 in an energy storage position. After the locking member is unlocked, the energy storage member 50 releases its energy storage to move the main drive mechanism 20 in a direction to open the main switch. In the preferred embodiment of fig. 2, the locking member 60 is pivotally connected at one end to the housing or casing of the switch structure and has a return spring to bias the locking member 60 back to the counterclockwise position. Accordingly, the dial 21 may have a protrusion 70 provided at a proper position, the protrusion 70 may push the locking member 60 open during movement of the dial 21 in the on direction (i.e., not blocking counterclockwise rotation of the dial 21), and abut the locking member 60 during movement of the dial 21 in the off direction, and the energy storage member 50 may be locked by the locking member 60 since the energy storage member 50 is connected to the dial 21.

By providing the position (in particular the angular position) of the locking member 60 and the projection 70, when the main drive mechanism 20 is moved in the direction of opening the main switch and the energy storage member 50 embodied as a spring is compressed but has not yet reached the spring dead point, the locking member 60 locks the energy storage member in an energy storage position, in which case the spring will release its elastic potential energy if the locking member 60 is unlocked, whereby the turntable 21 is moved in the direction of opening the main switch. On the other hand, when the main drive mechanism 20 is moved in a direction to open the main switch and the energy storage member 50 implemented as a spring is compressed and passes its spring dead point, the locking member 60 will also lock the energy storage member in the energy storage position, at which time, if the locking member 60 is unlocked, the spring will release its elastic potential energy, so that the turntable 21 is moved in a direction to open the main switch. Preferably, the locking member 60 may be manufactured, for example, from a ferrous material, and its unlocking may be achieved by an additional electromagnet drive mechanism; for example, upon an unlocking command from the BMS, the electromagnet may be energized, the magnetic force of which will attract the locking member 60 away from the locked position, thereby releasing the turntable 21 and thus the energy storage member. Or the locking and unlocking operations of the locking member may be accomplished by any other suitable means and mechanism as long as it can accomplish the above-described functions.

Further preferably, although not shown, the secondary drive mechanism 30 may also include an energy storage component 80, such as a spring, that is pivotally connected at one end to the frame or housing and at the other end to the dial of the secondary drive mechanism 30. By properly setting its position (particularly the angular position), the energy storage member 80 can release its energy storage after the primary switch has been turned on, so that the dial of the secondary drive mechanism 30 rotates in a direction opposite to the direction B, thereby turning the secondary switch off. It should be appreciated that the energy storage component 80 may have other suitable embodiments, such as pneumatic, hydraulic energy storage mechanisms, and the like.

Further preferably, although not shown, the switch structure may further include: a main sensor for indicating an on state or an off state of the main switch; a sub sensor for indicating an on state or an off state of the sub switch; and/or a locking sensor for indicating that the locking member locks the energy storage member. The sensor may be a micro switch, a hall sensor, a photoelectric sensor, etc., as long as it can sense the position of the relevant switch, the locking state of the energy storage component.

A method for controlling a battery charge-discharge circuit according to the present invention will be further described below in accordance with the above-described principles of the present invention, and in particular with reference to the preferred embodiment of the switch structure of fig. 2.

Referring to fig. 3-5, the method includes performing one of three operations according to a control command. The control command is, for example, from the BMS, and it is generally only necessary to control the rotation of the motor for driving the main driving mechanism 20 and the unlocking/locking of the locking member to achieve these three operations.

Referring to fig. 3, the first operation is mainly for realizing: from the state that the main loop and the pre-charging loop are both disconnected, the pre-charging loop is firstly connected to pre-charge the battery; then the main loop is connected; the precharge circuit is then disconnected. Specifically, the first operation includes:

step S11 is executed according to the control command: the primary drive mechanism 20 drives the secondary drive mechanism 30 to move in the on direction to turn on the secondary switch so that the battery is pre-charged through the pre-charge circuit;

Step S12 is executed according to the control command: the main driving mechanism 20 drives the main switch to move towards the on direction so as to enable the main switch to be on, at the moment, the main circuit is on, the battery can be normally charged, and the pre-charging circuit is also in the on state;

Step S13 is executed according to the control command: the primary drive mechanism 20 drives the secondary drive mechanism 30 in the opening direction such that the secondary switch is opened, i.e. the pre-charge circuit is opened, and the battery is charged only through the primary circuit.

Preferably, a predetermined time delay may be spaced between step S11 and step S12. The delay may be preset by the BMS system or by any suitable control circuit, or may be manually controlled by the user to switch on the main circuit after the precharge circuit has been on for a period of time.

Further preferably, before step S11, a determining step S110 may be further included, for example, by determining, through position sensors provided for the first switch 11 and the second switch 12, the third switch 13 and the fourth switch 14, whether both the main switch and the sub switch are turned off, if yes, step S11 is performed, otherwise, ending.

It will be appreciated that, similar to this determination step, the determination of the switch positions in each subsequent determination step is mainly performed by the BMS based on the sensing signals from the sensors as described above, i.e., the determination is performed based on the positions (corresponding to on or off states) where each switch is located, so that it is possible to ensure that the related operations correspond to the correct switch states, and avoid misoperation.

Preferably, before step S12, a determining step S120 is further included to determine whether the secondary switch is turned on, if yes, step S12 is performed, otherwise, a determining step S121 is further performed to determine whether the primary switch and the secondary switch are both turned off, if yes, the primary driving mechanism 20 drives the primary switch to move in the on direction so as to turn on the primary switch (i.e. perform a step similar to the following second operation so as to quickly turn on the primary circuit), and otherwise, the process is ended.

Further preferably, step S11 further includes: before the primary drive mechanism 20 drives the secondary drive mechanism 30 in the on direction and the primary switch is about to be turned on, the energy storage component 50 is locked to store energy in the energy storage component 50 and prevent the primary drive mechanism 20 from moving in the off direction. That is, by locking the energy storage member 50 before the main switch is turned on, the main switch can be prevented from moving in the off direction to ensure that the subsequent main switch on operation is smoothly performed.

Further preferably, step S13 further includes: the energy storage component 50 is locked to store energy in the energy storage component 50 before the primary drive mechanism 20 drives the secondary drive mechanism 30 in the opening direction and the primary switch has not been opened.

By this operation, after the main switch is turned on, the main driving mechanism 20 can move in the off direction according to the command, and further the sub-switch 30 is driven to turn off the sub-switch, so that the battery is brought into a normal charge state; while the main switch remains on, movement of the main drive mechanism 20 in the off direction also causes the energy storage member 50 to store energy and again be locked to store energy for subsequent main circuit opening operations.

Further, the first operation further includes: step S14 is executed according to the control command: the energy storage component 50 is caused to release its energy storage to cause the primary drive mechanism 20 to drive the primary switch in an opening direction to open the primary switch. The step S14 corresponds to an operation of opening the main circuit after the battery is charged.

Further preferably, before step S14, a determining step S140 is further included to determine whether the primary switch is turned on, if yes, step S14 is performed, otherwise, a determining step S141 is further performed to determine whether the secondary switch is turned on, if yes, the primary driving mechanism 20 drives the secondary driving mechanism 30 to move in the off direction, so that the secondary switch is turned off, and otherwise, the process is ended.

In fig. 3 and subsequent fig. 4 and 5, the node A, B does not indicate that the operation flow is continuously executed without interruption, but is executed according to a control command.

Referring to fig. 4, the second operation is mainly for realizing: the main circuit is quickly connected in a state that the main circuit and the pre-charging circuit are disconnected so as to charge the battery normally. The pre-charge circuit will briefly turn on and quickly turn off during this process. And the second operation may also be used in the case where the battery is already full to discharge the battery. Thus, the main circuit of the present invention can be used to perform the dual functions of charging and discharging a battery. Specifically, the second operation includes: step S21 is executed according to the control command: the main driving mechanism 20 drives the main switch to turn on the main switch.

Preferably, step S21 includes: the main driving mechanism 20 turns on the sub-switch, turns on the main switch, and turns off the sub-switch in this order. In contrast to the first operation, the command issued by the BMS does not include a delay as in the first operation, but rapidly passes through the process of the precharge circuit being turned on first, the main circuit being turned on again, and the precharge circuit being turned off.

In step S21, similarly to the first stage of the first operation in which the main driving mechanism 20 moves in the opening direction of the main switch, the energy storage member 50 is also stored in the process of the main driving mechanism 20 driving the sub driving mechanism 30 to move in the opening direction after the main switch is turned on, so as to prepare for the subsequent main switch opening operation.

Further, the second operation further includes: step S22 is executed according to the control command: the energy storage component 50 is caused to release its energy storage so that the main drive mechanism 50 drives the main switch in the opening direction to open the main switch.

Further preferably, before step S21, a determining step S210 is further included to determine whether the main switch and the sub switch are both turned off, if yes, step S21 is performed, otherwise, a determining step S211 is further performed to determine whether the sub switch is turned on, if yes, the main driving mechanism 20 drives the main switch to turn on, and if not, the process is ended.

Further preferably, the method further includes a determining step S220 before the step S22 to determine whether the main switch is turned on, if yes, the step S22 is executed, otherwise, the determining step S221 is further executed to determine whether the sub-switch is turned on, if yes, the main driving mechanism 20 drives the sub-driving mechanism 30 to move in the off direction so as to turn off the sub-switch, otherwise, the method is ended.

Referring to fig. 5, the third operation is mainly for realizing: the precharge circuit is turned on from a state where both the main circuit and the precharge circuit are turned off to precharge the battery. Specifically, the third operation includes: step S31 is executed according to the control command: the primary drive mechanism 20 drives the secondary drive mechanism 30 in the on direction to turn on the secondary switch. By this point the precharge circuit has been turned on and the battery will be precharged without further command or manual operation by the user.

Further preferably, before step S31, a determining step S310 is further included to determine whether the primary switch and the secondary switch are both turned off, if yes, step S31 is performed, otherwise, the process is ended.

Further preferably, step S31 may further include, similar to step S11: before the primary drive mechanism 20 drives the secondary drive mechanism 30 in the on direction and the primary switch is about to be turned on, the energy storage component 50 is locked to store energy in the energy storage component 50 and prevent the primary drive mechanism 20 from moving in the off direction.

Further, the third operation further includes: step S32 is executed according to the control command: the energy storage component 50 is caused to release its energy storage so that the primary drive mechanism 50 drives the secondary drive mechanism 30 in the opening direction to open the secondary switch. That is, the precharge circuit may be disconnected after the battery is precharged for a period of time.

It is further preferable that the method further includes a determining step S320 before the step S32 to determine whether the secondary switch is turned on, if yes, the step S32 is executed, otherwise, the determining step S321 is further executed to determine whether the primary switch is turned on, if yes, the primary driving mechanism 30 drives the primary switch to turn off, otherwise, the method is ended.

By the switch structure and the method for controlling the battery charging and discharging circuit, the fusion of the electric isolating switch with the direct current belt pre-charging function can be realized, one manual isolating switch, three contactors and direct wiring of the low-voltage electric appliances in the prior art are replaced, and the circuit mechanism and the control mechanism are greatly simplified. And the main loop and the pre-charging loop can be quickly switched on and off. And the battery can be directly disconnected after being connected with the pre-charge loop, and the main loop is not connected, so that the greater flexibility of charge and discharge control is realized, and the short circuit tolerance of the related circuit is improved.

The exemplary implementation of the present disclosure has been described in detail hereinabove with reference to the preferred embodiments, however, it will be understood by those skilled in the art that various modifications and adaptations to the specific embodiments described above may be made and that various combinations of the technical features and structures set forth in the present disclosure may be practiced without departing from the scope of the present disclosure, which is defined in the appended claims.

Claims (20)

1. A switching structure for a battery charge-discharge circuit including a main loop and a pre-charge loop connected in parallel between a power source and a battery, the switching structure comprising:

A main switch for the main circuit, the main switch comprising a first switch (11) connected in series between the positive electrode of the power supply and the positive electrode of the battery and a second switch (12) connected in series between the negative electrode of the power supply and the negative electrode of the battery; and

A secondary switch for the pre-charge circuit, the secondary switch comprising a third switch (13) connected in series between the positive power supply and the positive battery and a fourth switch (14) connected in series between the negative power supply and the negative battery.

2. The switch structure of claim 1, wherein,

The first switch (11) is linked with the second switch (12) to synchronously switch on or off the main loop; and is also provided with

The third switch (13) and the fourth switch (14) are linked to synchronously switch on or off the pre-charging loop.

3. The switch structure of claim 2, further comprising:

a main driving mechanism (20) for driving the main switch to be turned on or off,

And a sub-driving mechanism (30) for driving the sub-switch to be turned on or off.

4. The switching structure of claim 3, wherein,

The main driving mechanism (20) further comprises an intermediate driving part (40); and is also provided with

The intermediate drive unit (40) is configured such that, during a movement of the main switch in the on direction by the main drive mechanism (20) and not yet being turned on, the intermediate drive unit (40) can drive the sub-drive mechanism (30) to turn on the sub-switch.

5. The switch arrangement of claim 4 wherein the secondary drive mechanism (30) includes an energy storage component and is arranged to release energy storage to cause the secondary switch to open after the primary switch has been turned on.

6. A switch arrangement according to claim 3, wherein the primary drive mechanism (20) further comprises an energy storage component (50), the energy storage component (50) being arranged to:

The energy storage component (50) is stored energy in a first stage of movement of the main drive mechanism (20) in a direction of turning on the main switch, and the energy storage component (50) releases the stored energy to achieve turning on of the main switch in a second stage of movement of the main drive mechanism (20) in a direction of turning on the main switch; and is also provided with

The energy storage component (50) is stored energy during a first phase of movement of the main drive mechanism (20) in a direction to open the main switch, and the energy storage component (50) releases the stored energy during a second phase of movement of the main drive mechanism (20) in the direction to open the main switch to effect opening of the main switch.

7. The switch arrangement of claim 6 wherein the primary drive mechanism (20) further comprises a locking member (60) configured to selectively lock the energy storage member (50) in an energy storage position; and, after the locking member is unlocked, the energy storage member (50) releases its energy storage to move the main drive mechanism (20) in a direction to open the main switch.

8. The switch structure of any of claims 1-7, further comprising:

A main sensor for indicating an on state or an off state of the main switch;

a sub sensor for indicating an on state or an off state of the sub switch; and/or

A locking sensor for indicating that the locking member locks the energy storage member (50).

9. A method for controlling a battery charge-discharge circuit comprising the switch structure of claim 8, the method comprising performing one of the following operations in accordance with a control command:

A first operation comprising:

step S11 is executed according to the control command: the main driving mechanism (20) drives the secondary driving mechanism (30) to move towards the on direction so as to enable the secondary switch to be on;

Step S12 is executed according to the control command: the main driving mechanism (20) drives the main switch to move towards the on direction so as to enable the main switch to be on;

Step S13 is executed according to the control command: the main driving mechanism (20) drives the secondary driving mechanism (30) to move towards the opening direction so as to open the secondary switch;

A second operation comprising:

Step S21 is executed according to the control command: the main driving mechanism (20) drives the main switch to turn on the main switch;

A third operation comprising:

Step S31 is executed according to the control command: the primary drive mechanism (20) drives the secondary drive mechanism (30) to move in an on direction to turn on the secondary switch.

10. The method of claim 9, wherein,

Before the step S11, a judging step S110 is further included to judge whether the primary switch and the secondary switch are both turned off, if yes, the step S11 is executed, otherwise, the step is ended;

Before step S12, a determining step S120 is further included to determine whether the secondary switch is turned on, if yes, step S12 is performed, otherwise, a determining step S121 is further performed to determine whether the primary switch and the secondary switch are both turned off, if yes, the primary driving mechanism (20) drives the primary switch to move in the on direction, so that the primary switch is turned on, and if not, the primary switch is ended.

11. The method of claim 10, wherein,

Step S11 further includes: locking the energy storage component (50) to store energy in the energy storage component (50) and prevent movement of the primary drive mechanism (20) in an off direction before the primary drive mechanism (20) drives the secondary drive mechanism (30) to move in an on direction and the primary switch is about to be turned on;

Step S13 further includes: locking the energy storage component (50) to store energy in the energy storage component (50) before the primary drive mechanism (20) drives the secondary drive mechanism (30) to move in an opening direction and the primary switch is not opened yet; and is also provided with

The first operation further includes:

Step S14 is executed according to the control command: the energy storage component (50) releases energy so that the main driving mechanism (20) drives the main switch to move towards the opening direction to open the main switch.

12. The method according to claim 11, further comprising a determining step S140 before step S14, wherein if the primary switch is turned on, step S14 is performed, otherwise, further determining step S141 is performed, wherein if the secondary switch is turned on, the primary driving mechanism (20) drives the secondary driving mechanism (30) to move in the off direction, so that the secondary switch is turned off, and otherwise, the method is ended.

13. The method of claim 9, wherein step S21 includes: the main driving mechanism (20) sequentially turns on the secondary switch, turns on the main switch, turns off the secondary switch, and

After the main switch is turned on, the main driving mechanism (20) drives the secondary driving mechanism (30) to move in the off direction, and the energy storage component (50) stores energy.

14. The method according to claim 13, further comprising, before step S21, a determining step S210 to determine whether the primary switch and the secondary switch are both turned off, if yes, performing step S21, otherwise further performing a determining step S211 to determine whether the secondary switch is turned on, if yes, the primary driving mechanism (20) drives the primary switch to turn on, otherwise ending.

15. The method of claim 14, wherein the second operation further comprises:

Step S22 is executed according to the control command: the energy storage component (50) is enabled to release energy stored by the energy storage component, so that the main driving mechanism 50 drives the main switch to move towards the opening direction, and the main switch is opened.

16. The method according to claim 15, further comprising a determining step S220 before step S22, to determine whether the primary switch is turned on, if yes, performing step S22, otherwise further performing a determining step S221, to determine whether the secondary switch is turned on, if yes, the primary driving mechanism (20) drives the secondary driving mechanism (30) to move in the off direction, so that the secondary switch is turned off, otherwise ending.

17. The method of claim 9, further comprising, prior to step S31, a determining step S310 to determine whether both the primary switch and the secondary switch are turned off, if so, performing step S31, otherwise ending.

18. The method of claim 17, wherein step S31 further comprises: locking the energy storage component (50) to store energy in the energy storage component (50) and prevent movement of the primary drive mechanism (20) in an off direction before the primary drive mechanism (20) drives the secondary drive mechanism (30) to move in an on direction and the primary switch is about to be turned on; and is also provided with

The third operation further comprises:

Step S32 is executed according to the control command: the energy storage component (50) is enabled to release energy storage of the energy storage component, so that the primary driving mechanism (50) drives the secondary driving mechanism (30) to move towards the opening direction, and the secondary switch is opened.

19. The method of claim 18, further comprising a determining step S320 before the step S32, to determine whether the secondary switch is turned on, if yes, performing the step S32, otherwise further performing a determining step S321, to determine whether the primary switch is turned on, if yes, the primary driving mechanism (30) drives the primary switch to turn off, otherwise ending.

20. The method of claim 9, wherein a predetermined time delay is spaced between step S11 and step S12.