High-voltage relay driving switching circuit, battery pack and energy storage device

Abstract

The utility model provides a high-voltage relay drive switching circuit, a battery pack and an energy storage device. The high-voltage relay drive switching circuit comprises a comparison sub-circuit, a high-voltage drive switching sub-circuit and a storage battery drive switching sub-circuit, the comparison sub-circuit is respectively connected with the storage battery, the high-voltage driving switching sub-circuit and the storage battery driving switching sub-circuit, the high-voltage driving switching sub-circuit is connected with the battery module, the storage battery driving switching sub-circuit is connected with the storage battery, and the high-voltage driving switching sub-circuit and the storage battery driving switching sub-circuit are both connected with the high-voltage relay. According to the scheme provided by the utility model, the high-voltage driving switching sub-circuit and the storage battery driving switching sub-circuit can be reasonably controlled to act according to the voltage condition of the storage battery, the storage battery can be used for supplying power to the high-voltage relay when the voltage of the storage battery is sufficient, and the storage battery can be used for supplying power to the high-voltage relay when the voltage of the storage battery is insufficient. Therefore, the driving stability and reliability of the high-voltage relay are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of relay driving, and in particular to a high-voltage relay driving switching circuit, a battery pack and an energy storage device. Background Art

[0002] As the number of electrical components in a car increases, the power consumption of the battery also increases. When the car is dormant or not in use for a long time, the battery cannot be effectively charged and is easily in a feeding state, which will eventually cause the battery modules in the battery pack to also be fed.

[0003] In the related art, when the battery is seriously overcharged, it is impossible to drive the main positive relay, main negative relay, pre-charge relay and other high-voltage relays to close, and thus it is impossible to complete the charging process independently. It is necessary to close the high-voltage relay by external jumper to assist in completing the charging process. As a result, the high-voltage relay driving process is time-consuming and labor-intensive, and is not stable and reliable enough. Utility Model Content

[0004] The utility model provides a high-voltage relay drive switching circuit, a battery pack and an energy storage device, which are used to solve the defect that the high-voltage relay drive process is not stable and reliable enough.

[0005] On the one hand, the utility model provides a high-voltage relay drive switching circuit, comprising: a comparison subcircuit, a high-voltage drive switching subcircuit and a battery drive switching subcircuit;

[0006] The comparison subcircuit is respectively connected to the battery, the high-voltage drive switching subcircuit and the battery drive switching subcircuit, the high-voltage drive switching subcircuit is connected to the battery module, the battery drive switching subcircuit is connected to the battery, and the high-voltage drive switching subcircuit and the battery drive switching subcircuit are both connected to the high-voltage relay;

[0007] After receiving the relay drive command signal, the comparison subcircuit compares the voltage of the battery with the voltage setting value, outputs a first switching signal to the high-voltage drive switching subcircuit, and outputs a second switching signal to the battery drive switching subcircuit;

[0008] When the high-voltage drive switching subcircuit receives the first switching signal and the level state of the first switching signal is the target state, the connecting branch between the battery module and the high-voltage relay is connected;

[0009] When the battery drive switching subcircuit receives the second switching signal and the level state of the second switching signal is the target state, the battery drive switching subcircuit connects the connection branch between the battery and the high-voltage relay.

[0010] According to the high-voltage relay drive switching circuit provided by the utility model, the comparison subcircuit includes: a first voltage stabilizing chip and a comparison module;

[0011] The first voltage stabilizing chip is connected to the comparison module, and the first voltage stabilizing chip is used to power the comparison module. The comparison module is respectively connected to the battery, the high-voltage drive switching subcircuit, and the battery drive switching subcircuit.

[0012] According to the high-voltage relay drive switching circuit provided by the utility model, the comparison module includes: a first comparator, a first inverter, an OR gate and an AND gate;

[0013] The first comparator is respectively connected to the first voltage stabilizing chip, the battery, the first inverter and the battery drive switching sub-circuit, the first inverter and the OR gate are both connected to the AND gate, the OR gate is connected to the main control chip of the battery management system, and the OR gate is used to receive the relay drive command signal sent by the main control chip.

[0014] According to the high-voltage relay drive switching circuit provided by the utility model, the high-voltage drive switching subcircuit includes: a first triode, a voltage conversion module, a second voltage stabilizing chip and a switching control module;

[0015] The base of the first transistor is connected to the comparison subcircuit, the emitter of the first transistor is connected to the positive electrode of the battery module, the collector of the first transistor is connected to the voltage conversion module, the voltage conversion module is respectively connected to the negative electrode of the battery module and the second voltage stabilizing chip, the second voltage stabilizing chip is connected to the switching control module, and the switching control module is connected to the high-voltage relay.

[0016] According to the high-voltage relay drive switching circuit provided by the utility model, the switching control module includes: a second comparator, a second inverter, a second transistor and a third transistor;

[0017] The second comparator is connected to the second voltage stabilizing chip, the second inverter and the second transistor respectively, the second transistor and the second inverter are both connected to the third transistor, and the third transistor is connected to the high-voltage relay.

[0018] According to the high-voltage relay drive switching circuit provided by the utility model, the voltage conversion module includes a transformer, a first peripheral unit and a second peripheral unit;

[0019] The input end of the transformer is connected to the first peripheral unit, the output end of the transformer is connected to the second peripheral unit, the first peripheral unit is respectively connected to the negative electrode of the battery module and the first transistor, and the second peripheral unit is connected to the second voltage stabilizing chip.

[0020] According to the high-voltage relay drive switching circuit provided by the utility model, the battery drive switching subcircuit includes: a fourth transistor, a first diode and a first resistor;

[0021] The emitter of the fourth transistor is connected to the battery, the base of the fourth transistor is connected to the comparison subcircuit, the collector of the fourth transistor is connected to the first diode, the first diode is connected to the first resistor, and the first resistor is connected to the high-voltage relay.

[0022] According to the high-voltage relay drive switching circuit provided by the utility model, the circuit further includes: an energy storage capacitor;

[0023] The energy storage capacitor is connected to the battery drive switching sub-circuit and the high-voltage relay respectively.

[0024] On the other hand, the utility model also provides a battery pack, comprising any one of the above-mentioned high-voltage relay drive switching circuits.

[0025] On the other hand, the utility model also provides an energy storage device, comprising any one of the above-mentioned high-voltage relay drive switching circuits or the above-mentioned battery pack.

[0026] The high-voltage relay drive switching circuit, battery pack and energy storage device provided by the utility model are provided with a comparison subcircuit, a high-voltage drive switching subcircuit and a battery drive switching subcircuit. After receiving the relay drive command signal, the comparison subcircuit compares the voltage of the battery with the voltage setting value, outputs a first switching signal to the high-voltage drive switching subcircuit, and outputs a second switching signal to the battery drive switching subcircuit; when the high-voltage drive switching subcircuit receives the first switching signal and the level state of the first switching signal is the target state, the connection branch between the battery module and the high-voltage relay is connected; when the battery drive switching subcircuit receives the second switching signal and the level state of the second switching signal is the target state, the connection branch between the battery and the high-voltage relay is connected. Since the actions of the high-voltage drive switching subcircuit and the battery drive switching subcircuit can be reasonably controlled according to the voltage of the battery, the battery can be used to power the high-voltage relay when the battery voltage is sufficient, and when the battery voltage is insufficient, the battery module is switched to power the high-voltage relay, thereby improving the driving stability and reliability of the high-voltage relay. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 It is a schematic diagram of the structure of the high-voltage relay inside the battery pack;

[0029] Figure 2 This is the driving principle diagram of the main positive relay;

[0030] Figure 3 It is a structural schematic diagram of a high-voltage relay drive switching circuit provided by an embodiment of the utility model;

[0031] Figure 4 It is a schematic diagram of the setting position of the high-voltage relay drive switching circuit in the embodiment of the utility model;

[0032] Figure 5 It is a structural schematic diagram of a voltage conversion module in an embodiment of the utility model. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] This embodiment relates to the field of relay driving, and can be specifically applied to the driving control scenario of a high-voltage relay in a battery pack. Figure 1 As shown, the high-voltage relay inside the battery pack includes a main positive relay K1, a main negative relay K2 and a pre-charge relay K3. The above high-voltage relays are connected to both ends of the battery module, such as Figure 1 The battery module is formed by connecting cells Cell1 to Cell100 in series.

[0035] The driving process of the main positive relay can be found in Figure 2When the BMS has a command to drive the relay, such as when the main control chip sends a relay drive command signal, the relay drive chip Uq first drives the two switches Ka and Kb to close, and then the battery supplies power to the coil to drive the main positive relay K1 to close. In this process, the driving voltage of the main positive relay K1 comes from the battery. If the battery is powered and the driving voltage is relatively low, when the BMS sends a driving command to close the relay, although the two Ka and Kb can be closed, the battery driving voltage is insufficient, and the coil cannot drive the main positive relay K1 to close, resulting in Figure 2 The high-voltage circuit in the relay is disconnected. The driving principle of other high-voltage relays is the same as that of the main positive relay, so it will not be repeated here.

[0036] It can be seen that since the high-voltage relay requires a higher driving voltage, when the battery is powered, for example, when the battery voltage is lower than 6V, the high-voltage relay cannot be effectively driven to close. At this time, if the user wants to close the high-voltage relay, an external jumper is required to assist in closing the high-voltage relay, which adds extra work to the user, is time-consuming and laborious, and results in low stability and reliability of the high-voltage relay driving process.

[0037] In view of the above technical problems, the embodiments of the present utility model provide corresponding solutions. Figures 3 to 5 The detailed scheme of the high-voltage relay drive switching circuit, battery pack and energy storage device provided in the embodiment of the utility model is described.

[0038] Figure 3 It is a structural schematic diagram of a high-voltage relay drive switching circuit provided in an embodiment of the utility model.

[0039] like Figure 3 As shown, the high-voltage relay drive switching circuit provided by the embodiment of the utility model specifically includes: a comparison sub-circuit 110 , a high-voltage drive switching sub-circuit 120 and a battery drive switching sub-circuit 130 .

[0040] The comparison subcircuit 110 is respectively connected to the battery V1, the high-voltage drive switching subcircuit 120 and the battery drive switching subcircuit 130, the high-voltage drive switching subcircuit 120 is connected to the battery module V2, the battery drive switching subcircuit 130 is connected to the battery V1, and both the high-voltage drive switching subcircuit 120 and the battery drive switching subcircuit 130 are connected to the high-voltage relay K.

[0041] After receiving the relay drive command signal sent by the main control chip of the battery management system, the comparison subcircuit 110 compares the voltage of the battery V1 with the voltage setting value, outputs a first switching signal to the high-voltage drive switching subcircuit 120, and outputs a second switching signal to the battery drive switching subcircuit 130.

[0042] The high-voltage drive switching sub-circuit 120 connects the connection branch between the battery module V2 and the high-voltage relay K when receiving the first switching signal and the level state of the first switching signal is the target state.

[0043] The battery drive switching sub-circuit 130 connects the connection branch between the battery V1 and the high-voltage relay K when receiving the second switching signal and the level state of the second switching signal is the target state.

[0044] In practical applications, the location of the high voltage relay drive switching circuit provided in this embodiment can be found in Figure 4 The high-voltage relay drive switching circuit W can be specifically arranged between a battery module formed by connecting the battery cells Cell1 to Cell100 in series and high-voltage relays such as the main positive relay K1, the main negative relay K2 and the pre-charge relay K3.

[0045] In this embodiment, the comparison subcircuit 110 can compare the voltage of the battery V1 with the voltage setting value, output a first switching signal to the high-voltage drive switching subcircuit 120 according to the comparison result, and output a second switching signal to the battery drive switching subcircuit 130, thereby controlling the high-voltage drive switching subcircuit 120 to be turned on, or controlling the battery drive switching subcircuit 130 to be turned on.

[0046] In actual applications, if the comparison result is that the voltage of the battery V1 is lower than the voltage setting value, the high-voltage drive switching subcircuit 120 is turned on by controlling the first switching signal; if the comparison result is that the voltage of the battery V1 is higher than the voltage setting value, the battery drive switching subcircuit 130 is turned on by controlling the second switching signal.

[0047] In some embodiments, the voltage setting value can be reasonably set according to actual control requirements, for example, the voltage setting value can be set to 8V.

[0048] It can be understood that the first switching signal and the second switching signal are essentially level signals, and the high-voltage drive switching subcircuit 120 and the battery drive switching subcircuit 130 can perform switching actions to connect or disconnect the circuit according to the level status of the level signals they receive.

[0049] In one embodiment, see Figure 3 The comparison sub-circuit 110 specifically includes: a first voltage stabilizing chip U7A and a comparison module.

[0050] The first voltage stabilizing chip U7A is connected to the comparison module, and the first voltage stabilizing chip U7A is used to power the comparison module. The comparison module is respectively connected to the battery V1, the high-voltage drive switching sub-circuit 120, and the battery drive switching sub-circuit 130.

[0051] The first voltage regulator chip U7A can be a voltage regulator chip of model NS6326, and the first voltage regulator chip U7A can output a voltage of 5V to power the comparison module. Figure 3 As shown, the first capacitor C3 and the second capacitor C4 are also connected to the two ends of the first voltage stabilizing chip U7A. The first capacitor C3 is connected to the output end of the first voltage stabilizing chip U7A, and the second capacitor C4 is connected to the input end of the first voltage stabilizing chip U7A. The first capacitor C3 and the second capacitor C4 are both grounded.

[0052] In one embodiment, if Figure 3 As shown, the comparison module specifically includes: a first comparator U1A, a first inverter U4A, an OR gate U3A and an AND gate U2A.

[0053] The first comparator U1A is respectively connected to the first voltage stabilizing chip U7A, the battery V1, the first inverter U4A and the battery drive switching subcircuit 130, the first inverter U4A and the OR gate U3A are both connected to the AND gate U2A, and the OR gate U3A is connected to the main control chip U10A of the battery management system.

[0054] In this embodiment, the OR gate U3A can receive the relay driving instruction signal sent by the main control chip U10A of the battery management system, and the OR gate U3A outputs a high level signal after receiving the relay driving instruction signal.

[0055] In one embodiment, see Figure 3 The high-voltage drive switching sub-circuit 120 specifically includes: a first transistor Q3, a voltage conversion module U8A, a second voltage stabilizing chip U9A and a switching control module.

[0056] The base of the first transistor Q3 is connected to the comparison subcircuit 110, the emitter of the first transistor Q3 is connected to the positive electrode of the battery module V2, the collector of the first transistor Q3 is connected to the voltage conversion module U8A, the voltage conversion module U8A is respectively connected to the negative electrode of the battery module V2 and the second voltage stabilizing chip U9A, the second voltage stabilizing chip U9A is connected to the switching control module, and the switching control module is connected to the high-voltage relay K.

[0057] like Figure 3 As shown, the two ends of the second voltage stabilizing chip U9A are also connected to a third capacitor C5 and a fourth capacitor C6, the third capacitor C5 and the fourth capacitor C6 are both grounded, and the second voltage stabilizing chip U9A can adopt a voltage stabilizing chip model LM7812.

[0058] In this embodiment, the voltage conversion module U8A can realize the function of converting high voltage to low voltage, and can convert the high voltage of the battery module into a low voltage of 14-30V. The specific structure of the voltage conversion module U8A can be seen in Figure 5 .

[0059] like Figure 5 As shown, the voltage conversion module includes a transformer T, a first peripheral unit 210 and a second peripheral unit 220 .

[0060] The input end of the transformer T is connected to the first peripheral unit 210, the output end of the transformer T is connected to the second peripheral unit 220, the first peripheral unit 210 is respectively connected to the negative electrode of the battery module and the first transistor, and the second peripheral unit 220 is connected to the second voltage stabilizing chip.

[0061] In one embodiment, see Figure 3 The switching control module specifically includes: a second comparator U6A, a second inverter U5A, a second transistor Q2 and a third transistor Q4.

[0062] The second comparator U6A is connected to the second voltage stabilizing chip U9A, the second inverter U5A and the second transistor Q2 respectively. The second transistor Q2 and the second inverter U5A are both connected to the third transistor Q4. The third transistor Q4 is connected to the high-voltage relay K.

[0063] like Figure 3 As shown, the second comparator U6A is also connected to the second resistor R10, the third resistor R11, the fourth resistor R8, and the fifth resistor R9, respectively. The fourth resistor R8 is connected to the second diode D3. The second diode D3 is respectively connected to the third diode D2 and the series branch of the sixth resistor R7 and the fifth capacitor C2. The second transistor Q2 is grounded through the seventh resistor R6.

[0064] In one embodiment, see Figure 3 The battery driving switching sub-circuit 130 specifically includes: a fourth transistor Q1, a first diode D1 and a first resistor R5.

[0065] The emitter of the fourth transistor Q1 is connected to the battery V1, the base of the fourth transistor Q1 is connected to the output end of the first comparator U1A in the comparison subcircuit 120, the collector of the fourth transistor Q1 is connected to the first diode D1, the first diode D1 is connected to the first resistor R5, and the first resistor R5 is connected to the high-voltage relay K through the third transistor Q4.

[0066] In one embodiment, see Figure 3 , the high-voltage relay drive switching circuit may further include: an energy storage capacitor C1.

[0067] The energy storage capacitor C1 is respectively connected to the first resistor R5 in the battery drive switching sub-circuit 130 , and the energy storage capacitor C1 is connected to the high-voltage relay K through the third transistor Q4 .

[0068] In this embodiment, the energy storage capacitor C1 is mainly used to charge and store energy when the battery V1 is fully charged, and when the battery V1 is insufficiently charged and before the low voltage converted by the voltage conversion module from the high voltage is sufficient to supply power to the high voltage relay K, the energy storage capacitor C1 is used to supply power to the high voltage relay K, thereby playing the role of a delay circuit.

[0069] Combine the following Figure 3 The working principle of the high-voltage relay drive switching circuit provided in this embodiment is described as follows:

[0070] In the first working condition, the battery changes from a non-power-feeding state to a power-feeding state. In this case, the working process of the high-voltage relay driving switching circuit is as follows:

[0071] When the battery V1 is not powered, the voltage of the battery V1 is greater than or equal to the voltage setting value 8V. At this time, the input voltage of the pin3 of the first comparator U1A is greater than 2V. Since the output voltage of the first voltage regulator chip U7A is 5V, the input voltage of the pin2 of the first comparator U1A is 2V. The pin5 of the first comparator U1A outputs a high-level signal (i.e., the second switching signal), which is converted into a low-level signal through the first inverter U4A. The gate U3A receives a driving instruction from any contactor and outputs a high-level signal. Therefore, when the battery V1 is not powered, the voltage of the battery V1 is greater than or equal to the voltage setting value 8V. When feeding, the AND gate U2A outputs a low-level signal (i.e., the first switching signal). At this time, the first transistor Q3 is not turned on, the voltage conversion module U8A does not work, the second voltage regulator chip U9A outputs 0V, the pin3 pin input of the second comparator U6A is 0V, and the pin2 pin input of the second comparator U6A is 2V. Therefore, the pin5 pin of the second comparator U6A outputs a low-level signal, which is input through the second inverter U5A and the pin3 pin of the third transistor Q4 as a high-level signal. The third transistor Q4 is turned on, and the second transistor Q2 is not turned on.

[0072] At the same time, since the pin5 of the first comparator U1A outputs a high-level signal, the fourth transistor Q1 is turned on. When the main control chip U10A sends a relay drive command signal to pre-drive the high-voltage relay K to close, the battery V1 supplies power to the high-voltage relay K through the fourth transistor Q1, the third transistor Q4, the first diode D1 and the first resistor R5, and the battery V1 charges the energy storage capacitor C1.

[0073] During the period when the battery V1 supplies power to the high-voltage relay K to keep the high-voltage relay K closed, the voltage of the battery V1 gradually decreases. When the voltage of the battery V1 is lower than the voltage setting value of 8V, the input voltage of the pin3 pin of the first comparator U1A is lower than 2V, the pin5 pin of the first comparator U1A outputs a low-level signal (i.e., the second switching signal), and the fourth transistor Q1 is not turned on. The battery V1 cannot supply power to the high-voltage relay. To prevent the high-voltage relay K from disconnecting, before the low-voltage electricity converted from the high voltage by the voltage conversion module is sufficient to supply power to the high-voltage relay K, the energy storage capacitor C1 supplies power to the high-voltage relay K, acting as a delay circuit.

[0074] Before the output voltage of the second voltage regulator chip U9A is greater than 10V, the pin5 of the second comparator U6A always outputs a low-level signal, the third transistor Q4 is always turned on, and the energy storage capacitor C1 supplies power to the high-voltage relay K to ensure that the high-voltage relay K will not be disconnected during the power switching process.

[0075] At the same time, after the voltage of the battery V1 is lower than the voltage setting value of 8V, the pin5 pin of the first comparator U1A outputs a low-level signal, passes through the first inverter U4A, and the BMS sends a relay drive command, and the pin3 pin of the AND gate U2A outputs a high-level signal (i.e., the first switching signal), the first transistor Q3 is turned on, the voltage conversion module is started, and the second voltage regulator chip U9A outputs a stable 12V voltage, which is supplied to the high-voltage relay through diodes D3 and D2. When the output voltage of the second voltage regulator chip U9A is greater than 10V, the pin3 pin of the second comparator U6A outputs a voltage greater than 2V, and the pin5 pin of the second comparator U6A outputs a high-level signal, passes through the second inverter U5A, the third transistor Q4 is not turned on, and the second transistor Q2 is turned on, and the energy storage capacitor C1 is self-discharged through the seventh resistor R6. The whole process completes the power supply of the high-voltage relay K from the battery V1 to the low voltage converted from the high voltage of the battery module V2.

[0076] In the second working condition, the battery changes from the feeding state to the non-feeding state. In this case, the working process of the high-voltage relay driving switching circuit is as follows:

[0077] When the battery V1 is powered, the voltage of the battery V1 is less than the voltage setting value 8V, and the input voltage of the pin3 pin of the first comparator U1A is less than 2V. Since the output voltage of the first voltage regulator chip U7A is 5V, the input voltage of the pin2 pin of the first comparator U1A is 2V, and the pin5 pin of the first comparator U1A outputs a low-level signal (i.e., the second switching signal), the fourth transistor Q1 is not turned on, and the battery V1 cannot provide driving power to the high-voltage relay.

[0078] At the same time, the low-level signal is converted into a high-level signal through the second inverter U4A. At this time, if the main control chip U10A sends a relay drive command signal, or the gate U3A receives a drive command of any contactor and sends a high-level signal, the AND gate U2A outputs a high-level signal (i.e., the first switching signal), the first transistor Q3 is turned on, the voltage conversion module is started, and the second voltage regulator chip U9A outputs a stable 12V voltage, which is supplied to the high-voltage relay through diodes D3 and D2, and the energy storage capacitor C2 is charged at the same time. When the output voltage of the second voltage regulator chip U9A is greater than 10V, the output voltage of the pin3 pin of the second comparator U6A is greater than 2V, and the pin5 pin of the second comparator U6A outputs a high-level signal, and after the second inverter U5A, the third transistor Q4 is not turned on, and the second transistor Q2 is turned on.

[0079] When the battery V1 is fed with power, after the high-voltage relay K is closed, the DCDC module will be triggered to charge the battery V1, and the voltage of the battery V1 will gradually increase. When the voltage of the battery V1 is higher than the voltage setting value of 8V, the input voltage of the pin3 pin of the first comparator U1A is higher than 2V, the pin5 pin of the first comparator U1A outputs a high-level signal (i.e., the second switching signal), and the AND gate U2A outputs a low-level signal (i.e., the first switching signal), the second transistor Q3 is not turned on, the voltage conversion module does not work, the second voltage regulator chip U9A outputs 0V, the pin3 pin input of the second comparator U6A is 0V, and the pin2 pin input of the second comparator U6A is 2V, so the pin5 pin of the second comparator U6A outputs a low-level signal, which passes through the second inverter U5A, and the pin3 pin input of the third transistor Q4 is a high-level signal, the third transistor Q4 is turned on, and the second transistor Q2 is not turned on.

[0080] At the same time, because pin5 of the first comparator U1A outputs a high-level signal, the fourth transistor Q1 is turned on. When the main control chip U10A sends a relay drive command signal, the battery V1 provides power to the high-voltage relay K through the fourth transistor Q1, the third transistor Q4, the first diode D1 and the first resistor R5. When the voltage conversion module stops working, in order to prevent the high-voltage relay K from disconnecting, the energy storage capacitor C1 can provide driving power for the high-voltage relay and act as a delay circuit until the energy storage capacitor C1 is discharged. The whole process is completed and the power supply of the high-voltage relay K is switched from the low voltage converted from the high voltage of the battery module V2 to the battery V1.

[0081] The solution provided in this embodiment can use the battery module to power the high-voltage relay after converting high voltage to low voltage when the battery voltage is insufficient to power the high-voltage relay. The power supply mode can be switched automatically, making the driving process of the high-voltage relay more stable and reliable.

[0082] In addition, an embodiment of the utility model further provides a battery pack, including the high-voltage relay drive switching circuit provided by the above embodiments.

[0083] In addition, an embodiment of the utility model further provides an energy storage device, including the high-voltage relay drive switching circuit provided in the above embodiments or the above-mentioned battery pack.

[0084] It is understandable that the energy storage device may be a vehicle, a working machine, etc.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A high voltage relay drive switching circuit, characterized in that: include: A comparison subcircuit, a high voltage drive switching subcircuit, and a battery drive switching subcircuit; The comparison subcircuit is respectively connected to the battery, the high-voltage drive switching subcircuit and the battery drive switching subcircuit, the high-voltage drive switching subcircuit is connected to the battery module, the battery drive switching subcircuit is connected to the battery, and the high-voltage drive switching subcircuit and the battery drive switching subcircuit are both connected to the high-voltage relay; After receiving the relay drive command signal, the comparison subcircuit compares the voltage of the battery with the voltage setting value, outputs a first switching signal to the high-voltage drive switching subcircuit, and outputs a second switching signal to the battery drive switching subcircuit; When the high-voltage drive switching subcircuit receives the first switching signal and the level state of the first switching signal is the target state, the connecting branch between the battery module and the high-voltage relay is connected; When the battery drive switching subcircuit receives the second switching signal and the level state of the second switching signal is the target state, the battery drive switching subcircuit connects the connection branch between the battery and the high-voltage relay.

2. The high voltage relay drive switching circuit according to claim 1, characterized in that: The comparison subcircuit comprises: a first voltage stabilizing chip and a comparison module; The first voltage stabilizing chip is connected to the comparison module, and the first voltage stabilizing chip is used to power the comparison module. The comparison module is respectively connected to the battery, the high-voltage drive switching subcircuit, and the battery drive switching subcircuit.

3. The high voltage relay drive switching circuit according to claim 2, characterized in that: The comparison module includes: a first comparator, a first inverter, an OR gate and an AND gate; The first comparator is respectively connected to the first voltage stabilizing chip, the battery, the first inverter and the battery drive switching sub-circuit, the first inverter and the OR gate are both connected to the AND gate, the OR gate is connected to the main control chip of the battery management system, and the OR gate is used to receive the relay drive command signal sent by the main control chip.

4. The high voltage relay drive switching circuit according to claim 1, characterized in that: The high-voltage drive switching subcircuit comprises: a first triode, a voltage conversion module, a second voltage stabilizing chip and a switching control module; The base of the first transistor is connected to the comparison subcircuit, the emitter of the first transistor is connected to the positive electrode of the battery module, the collector of the first transistor is connected to the voltage conversion module, the voltage conversion module is respectively connected to the negative electrode of the battery module and the second voltage stabilizing chip, the second voltage stabilizing chip is connected to the switching control module, and the switching control module is connected to the high-voltage relay.

5. The high voltage relay drive switching circuit according to claim 4, characterized in that: The switching control module includes: a second comparator, a second inverter, a second transistor and a third transistor; The second comparator is connected to the second voltage stabilizing chip, the second inverter and the second transistor respectively, the second transistor and the second inverter are both connected to the third transistor, and the third transistor is connected to the high-voltage relay.

6. The high voltage relay drive switching circuit according to claim 4, characterized in that: The voltage conversion module includes a transformer, a first peripheral unit and a second peripheral unit; The input end of the transformer is connected to the first peripheral unit, the output end of the transformer is connected to the second peripheral unit, the first peripheral unit is respectively connected to the negative electrode of the battery module and the first transistor, and the second peripheral unit is connected to the second voltage stabilizing chip.

7. The high voltage relay drive switching circuit according to claim 1, characterized in that: The battery drive switching subcircuit comprises: a fourth transistor, a first diode and a first resistor; The emitter of the fourth transistor is connected to the battery, the base of the fourth transistor is connected to the comparison subcircuit, the collector of the fourth transistor is connected to the first diode, the first diode is connected to the first resistor, and the first resistor is connected to the high-voltage relay.

8. The high voltage relay drive switching circuit according to claim 1, characterized in that: The circuit also includes: an energy storage capacitor; The energy storage capacitor is connected to the battery drive switching sub-circuit and the high-voltage relay respectively.

9. A battery pack, characterized in that: It comprises the high voltage relay drive switching circuit as claimed in any one of claims 1 to 8.

10. An energy storage device, characterized in that: It comprises the high-voltage relay drive switching circuit as described in any one of claims 1 to 8 or the battery pack as described in claim 9.

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