High-voltage control circuit and energy storage system

Abstract

The utility model discloses a high-voltage control circuit and an energy storage system, the high-voltage control circuit comprises an anode line, a first loop and a second loop, the first loop and the second loop are arranged on the anode line in parallel, a first relay and a second relay are sequentially connected on the anode line in series, and the first loop is connected to two ends of the first relay in parallel. The second loop is connected in parallel to two ends of the second relay; the first loop and the second loop are only conducted independently. The energy storage system is provided with the high-voltage control circuit.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of charge and discharge control technology, specifically relates to a high voltage control circuit and energy storage system. BACKGROUND

[0002] In the functional safety of energy storage battery system, if the grade serious fault appears, will disconnect the relay and prohibit charging / discharging; in the general high voltage control hardware circuit, once the fault occurs, considering the safety, directly carries out synchronous prohibition, does not distinguish charging and discharging; this design guarantees the safety, but actually is the performance of centralized processing of fault, is the confusion to regional, same type fault problem, and is not conducive to subsequent maintenance operation.

[0003] Therefore, there is an urgent need for a high voltage control circuit that can distinguish between charging and discharging and execute the prohibition separately. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a kind of high voltage control circuit and energy storage system, distinguish between charging and discharging, can execute prohibition separately for prohibition of charging and prohibition of discharging;Make the clear fault division of hardware support, make fault clear and traceable, it is beneficial to subsequent maintenance operation.

[0005] The utility model solves the technical scheme that its technical problem adopts, proposes a kind of high voltage control circuit, including positive line and the first loop, second loop being connected in parallel in the positive line, first relay KM1, second relay KM2 are sequentially connected in the positive line, the first loop is parallel to the two ends of the first relay KM1, the second loop is parallel to the two ends of the second relay KM2;First unidirectional conducting element, first switch K1 are sequentially connected in the first loop;Second switch K2, second unidirectional conducting element are sequentially connected in the second loop.

[0006] The conducting direction of the first loop and the second loop is opposite. First unidirectional conducting element is diode D1, and second unidirectional conducting element is diode D2.

[0007] Further, a fuse FU is connected in series on the positive line.

[0008] Further, it further includes a negative line, and a third relay KM3 is connected in series on the negative line.

[0009] Further, a control switch K0 is arranged on the positive line and the negative line. The control switch K0 is disconnected, and charging and discharging are prohibited.

[0010] Further, it further includes a pre-charge loop, and the pre-charge loop is connected in parallel to the two ends of the first relay KM1 and the second relay KM2.

[0011] Further, the pre-charge circuit is in series with a pre-charge relay K3 and a pre-charge resistor R in sequence.

[0012] Further, the first relay KM1 is disconnected, the second relay KM2 is connected, the first switch K1 is connected, the first circuit is conducted, and the charging is prohibited but the discharging is not prohibited.

[0013] Further, the first relay KM1 is connected, the second relay KM2 is disconnected, the second switch K2 is connected, the second circuit is conducted, and the charging is not prohibited but the discharging is prohibited.

[0014] Further, the first switch K1 and the second switch K2 are electromagnetic relays.

[0015] The utility model also provides a kind of energy storage system, and the energy storage system is configured with the high voltage control circuit of above-mentioned. For fault control, execute the operation of prohibiting charging and discharging.

[0016] Further, the energy storage system further includes a controller, and the controller is electrically connected with the first relay KM1, the second relay KM2, the third relay KM3, the first switch K1, the second switch K2, the pre-charge switch K3 and the control switch K0.

[0017] The utility model has the advantages that:

[0018] The utility model provides a kind of high voltage control circuit and energy storage system, reach the effect of prohibiting charging and discharging by disconnecting and connecting corresponding relay, distinguish charging and discharging, can separate the execution of prohibiting charging and discharging;For the working condition of prohibiting charging and not prohibiting discharging / prohibiting discharging and not prohibiting charging, can switch state by the control of relay.

[0019] Only the first circuit or the second circuit is conducted each time, effectively distinguish charging and discharging, make the clear fault division of hardware support, such as charging fault, discharging fault, make fault clear and traceable, it is favorable for subsequent repair operation. Prohibiting charging and discharging can also be realized based on control switch. BRIEF DESCRIPTION OF DRAWINGS

[0020] The drawings incorporated into and forming a part of the specification illustrate embodiments of the present application and together with the description serve to explain the principles of the application. In the drawings, which are not necessarily to scale, like numerals represent like elements in the several views. The drawings are of some embodiments of the present application and not all possible embodiments. Other embodiments of the present application, upon application of the principles disclosed herein, can occur to skilled artisans without departing from the spirit and scope of the present application.

[0021] Figure 1 It is a structure diagram of the high voltage control circuit of the utility model embodiment.

[0022] Figure 2 is a schematic diagram of the case of forbidden charging and not forbidden discharging;

[0023] Figure 3 is a schematic diagram of the case of forbidden discharging and not forbidden charging. DETAILED DESCRIPTION

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application and the prior art, the specific embodiments of the present application will be described below with reference to the drawings. Obviously, the drawings described below are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained from these drawings without creative labor, and other embodiments can also be obtained. In addition, the design direction is only to represent the relative position relationship between the components, not the absolute position relationship.

[0025] The embodiment of the present application provides a high-voltage control circuit, please refer to Figure 1 、 Figure 2 、 Figure 3 , mainly including a positive line and a first loop and a second loop connected in parallel on the positive line, the first relay KM1 and the second relay KM2 are connected in series on the positive line, the first loop is connected in parallel to both ends of the first relay KM1, and the second loop is connected in parallel to both ends of the second relay KM2; the first loop and the second loop are only individually turned on.

[0026] The high-voltage control circuit further comprises a negative line, the third relay KM3 is connected in series on the negative line, and the positive line and the negative line form a main loop to realize charging and discharging. When the function of forbidden charging and forbidden discharging is realized, only the on-off of the positive line, the first loop and the second loop is considered, and the negative line is defaulted to meet the corresponding functional requirements, that is, the third relay KM3 is in a closed and turned-on state.

[0027] In the embodiment of the present application, a fuse FU can be configured on the positive line to protect the circuit, and the fuse FU is connected in series to the positive line.

[0028] In the present application, the first loop and the second loop carried on the positive line are only individually turned on, that is, only one can be turned on at a time, at which time the effects of forbidden charging and not forbidden discharging and forbidden discharging and not forbidden charging are realized respectively, but for the working condition of forbidden charging and forbidden discharging, it cannot be realized by relying on the two loops. Therefore, when forbidden charging and forbidden discharging is needed, the positive line and the negative line can be directly and synchronously cut off.

[0029] In a feasible embodiment, a control switch K0 can be configured on the positive line and the negative line to synchronously cut off the positive line and the negative line, and realize the synchronous execution of forbidden charging and forbidden discharging. In normal state, the control switch K0 is defaulted to be in a closed state.

[0030] Of course, the first relay KM1 or the second relay KM2 on the positive line and the third relay KM3 on the negative line are used to realize the forbidden charging and discharging. Taking the first relay KM1 and the third relay KM3 as an example, the first relay KM1 and the third relay KM3 are simultaneously disconnected, and the same effect as the opening of the control switch K0 is realized.

[0031] However, in actual situations, a pre-charging circuit is often configured on the positive line, which is often directly connected in parallel to the load port, but does not pass through the control switch K0, that is, is connected in parallel to the two ends of the first relay KM1 and the second relay KM2. The on-off of the first relay KM1 and the second relay KM2 cannot affect the pre-charging circuit, but the on-off of the control switch K0 can directly affect the pre-charging circuit.

[0032] Therefore, when the forbidden charging and discharging is realized based on the first relay KM1 and the third relay KM3, it should be ensured that the pre-charging circuit is in a disconnected state.

[0033] In a specific example, the pre-charging circuit is connected in series with a pre-charging relay K3 and a pre-charging resistor R in sequence, wherein the pre-charging relay K3 is used to control the on-off of the pre-charging circuit. When the pre-charging relay K3 is disconnected, the forbidden charging and discharging can be realized in cooperation with the first relay KM1 and the third relay KM3. When the pre-charging relay K3 is closed, the forbidden charging and discharging cannot be supported. When the pre-charging circuit is turned on, the pre-charging function is realized.

[0034] In the embodiments of the present application, please refer to Figure 1 The main circuit formed by the positive line and the negative line has the battery (B) and the charging and discharging port (P) at both ends. One end of the positive line and the negative line is connected to the positive and negative poles of the battery, and the other end is the charging and discharging port. The current on the high-voltage control circuit is high-voltage direct current. When charging, the charging and discharging port P functions as a charging port, and high-voltage direct current is input from the charging port to the battery B to charge the battery. When discharging, the charging and discharging port P functions as a discharging port, and high-voltage direct current is output from the battery B to the outside through the discharging port. The output objects include a driving motor, a vehicle-mounted device, and an external discharging device.

[0035] When charging, the current flows from P to B through the high-voltage control circuit. At this time, the first circuit can be in a conductive state, and the second circuit is in a disconnected state, that is, the forbidden charging and discharging are not forbidden. When discharging, the current flows from B to P through the high-voltage control circuit. At this time, the second circuit can be in a conductive state, and the first circuit is in a disconnected state, that is, the forbidden charging and discharging are not forbidden.

[0036] It can be understood that the first circuit should be reverse-conductive, and the current can only flow from P to B; the second circuit should be forward-conductive, and the current can only flow from B to P.

[0037] Therefore, at least one controllable switch and one unidirectional conduction element limiting the conduction direction should be included in the first loop, wherein the controllable switch is used to control the on-off of the first loop, and the conduction direction requires the current to flow from P to B.

[0038] Similarly, at least one controllable switch and one unidirectional conduction element limiting the conduction direction should be included in the second loop, wherein the controllable switch is used to control the on-off of the second loop, and the conduction direction requires the current to flow from B to P.

[0039] The controllable switches in the first loop and the second loop can be the same, and the unidirectional conduction elements can also be the same, but should be installed in reverse to make the current flow in opposite directions and make the conduction directions of the first loop and the second loop opposite.

[0040] Specifically, the controllable switch can be an electromagnetic relay or other electrically controlled switch, and the unidirectional conduction element can be a diode or a combination of multiple elements with unidirectional conduction.

[0041] Taking the controllable switch as an electromagnetic relay and the unidirectional conduction element as a diode as an example:

[0042] Please refer to Figure 2 , the current flows from B to P, and the second loop is connected in series with the second switch K2 and the diode D2; when the first relay KM1 is closed, the second relay KM2 is opened, and the second switch K2 is closed, the second loop is conducted, realizing the function of prohibiting charging and not prohibiting discharging.

[0043] Please refer to Figure 3 , the current flows from P to B, and the first loop is connected in series with the diode D1 and the first switch K1; when the first relay KM1 is opened, the second relay KM2 is closed, and the first switch K1 is closed, the first loop is conducted, realizing the function of prohibiting discharging and not prohibiting charging.

[0044] The application also provides a storage system, which is configured with the high-voltage control circuit described above, and the storage system can be loaded with a controller, which is electrically connected with the first relay KM1, the second relay KM2, the third relay KM3, the first switch K1, the second switch K2, the pre-charging switch K3, and the control switch K0, and realizes the functions of pre-charging, separate execution of prohibiting discharging and not prohibiting charging / prohibiting charging and not prohibiting discharging, synchronous execution of prohibiting charging and discharging, and switching of the state of prohibiting charging and discharging through the controller.

[0045] When the controller controls the control switch K0, the control switch K0 is generally in a closed state, and the functions of charging and discharging and the functions related to prohibiting charging and discharging are realized through the on-off of the other switches.

[0046] When the controller controls the first relay KM1, the second relay KM2, the third relay KM3, the first switch K1, the second switch K2, and the pre-charging switch K3 to realize the functions related to prohibiting charging and discharging, the following cases are included:

[0047] When normal charging and discharging, first close the third relay KM3 on the negative line, delay and close the pre-charge relay K3, after pre-charge is completed, then close the first relay KM1 and the second relay KM2 on the positive line, delay and open the pre-charge relay K3.

[0048] When normal charging and discharging is switched to forbidden charging and not forbidden discharging, close the second switch K2, delay and open the second relay KM2; when normal charging and discharging is switched to forbidden discharging and not forbidden charging, close the first switch K1, delay and open the relay KM1.

[0049] When forbidden charging and not forbidden discharging is switched to forbidden discharging and not forbidden charging, close the first switch K1, delay and close the second relay KM2, delay and open the first relay KM1, and then delay and open the second switch K2; when forbidden discharging and not forbidden charging is switched to forbidden charging and not forbidden discharging, close the second switch K2, delay and close the first relay KM1, delay and open the second relay KM2, and then delay and open the first switch K1.

[0050] When forbidden charging and not forbidden discharging is switched to normal charging and discharging, close the second relay KM2, delay and open the second switch K2; when forbidden discharging and not forbidden charging is switched to normal charging and discharging, close the first relay KM1, delay and open the first switch K1.

[0051] When forbidden charging and not forbidden discharging is switched to forbidden charging and forbidden discharging, open the first relay KM1, delay and open the second switch K2, and then delay and open the third relay KM3; when forbidden discharging and not forbidden charging is switched to forbidden charging and forbidden discharging, open the second relay KM2, delay and open the first switch K1, and then delay and open the third relay KM3. It should be clear that during this process, the pre-charge relay K3 is in an open state.

[0052] The application designs a high-voltage control circuit on the basis of hardware, so that it has the condition of distinguishing forbidden charging and forbidden discharging, and cooperates with the controller to realize the switching of the circuit state. Compared with distinguishing forbidden charging and forbidden discharging by relying on BMS software alone, it has higher safety; at the same time, in the face of fault problems, it can effectively distinguish whether it is a charging fault or a discharging fault, and achieve separate disablement without confusion.

[0053] It can be understood that based on BMS software, although it can be designed according to the conditions of forbidden charging and not forbidden discharging, or forbidden discharging and not forbidden charging, the forbidden charging and forbidden discharging can be executed separately, without hardware support, relying on software control for the high-voltage control circuit still has a large safety hazard, such as dead machine, control command disorder, failure, etc. When a fault occurs, it cannot respond in time, but will cause greater accidents.

[0054] It is to be noted that the relational terms herein, such as first and second, and the like, are used solely to distinguish one from another entity or action without necessarily requiring or implying any actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0055] The above further describes the present application in detail in connection with specific preferred embodiments. It is to be understood that the specific embodiments described above are not to be construed as limiting the present application, but merely as describing specific embodiments thereof. It is to be understood that many variations and modifications of the application can be made by those skilled in the art without departing from the spirit and scope of the application. Accordingly, it is not intended that the application be limited, except as by the appended claims.

Claims

1. A high voltage control circuit, characterized by, The high-voltage control circuit comprises a negative electrode line, a positive electrode line, a first return circuit and a second return circuit which are connected in parallel to the positive electrode line, one end of the negative electrode line and the positive electrode line is connected to the positive and negative electrodes of the battery, and the other end is a charging and discharging port. The first return circuit is connected in parallel to both ends of the first relay, and the second return circuit is connected in parallel to both ends of the second relay. The first return circuit is connected in series with a first unidirectional conducting element and a first switch in sequence, and the second return circuit is connected in series with a second switch and a second unidirectional conducting element in sequence.

2. A high voltage control circuit according to claim 1, characterized in that The positive electrode line is connected in series with a fuse.

3. The high voltage control circuit of claim 1, wherein, The negative electrode line is connected in series with a third relay.

4. A high voltage control circuit according to claim 3, characterized in that The positive electrode line and the negative electrode line are both provided with a control switch, and the control switch is turned off to disable charging and discharging.

5. The high voltage control circuit of claim 1, wherein, The high-voltage control circuit further comprises a pre-charging circuit which is connected in parallel to both ends of the first relay and the second relay.

6. A high voltage control circuit according to claim 5, wherein The pre-charging circuit is connected in series with a pre-charging relay and a pre-charging resistor in sequence, the pre-charging relay is closed, and the pre-charging circuit is turned on.

7. The high voltage control circuit of claim 1, wherein, The first relay is turned off, the second relay is turned on, the first switch is turned on, and the first return circuit is turned on to disable discharging and enable charging.

8. The high voltage control circuit of claim 1, wherein, The first relay is turned on, the second relay is turned off, the second switch is turned on, and the second return circuit is turned on to disable charging and enable discharging.

9. An energy storage system characterized by, The energy storage system is provided with a high-voltage control circuit as claimed in any one of claims 1-8.

10. An energy storage system according to claim 9, wherein, The energy storage system further comprises a controller which is electrically connected to the first relay, the second relay, the third relay, the first switch, the second switch, the pre-charging relay and the control switch.

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