Pulse circuit, control method and vehicle

Abstract

The present application relates to a pulse circuit, a control method and a vehicle, and relates to the field of battery charging and discharging technology. The pulse circuit includes a pre-charging module, a first switching circuit, an energy connection end and a capacitive energy storage device. Among them, the pre-charging module, the energy connection end and the capacitive energy storage device are connected to each other; the first end of the first switching circuit is located between the energy connection end and the capacitive energy storage device, and the second end of the first switching circuit is connected to the pre-charging module; by turning on and off the first switching circuit and the pre-charging module, a pulse current is generated. The pre-charging of the capacitive energy storage device is achieved by controlling the on and off between the pre-charging module and the capacitive energy storage device. A pulse current for self-heating the battery pack is generated by controlling the on and off of the pre-charging module and the first switching circuit. In this way, the integration of the pre-charging function and the self-heating function of the battery pack is achieved without the need to set up additional hardware facilities such as components, thereby improving the integration of the pulse circuit.

Description

Technical Field

[0001] The present application relates to the technical field of battery charging and discharging, and in particular to a pulse circuit, a control method and a vehicle. Background Art

[0002] At present, battery heating technology usually achieves heat transfer to the battery pack by setting a heating film on the surface of the battery pack and applying voltage to the heating film to increase the temperature. Pre-charging technology usually uses pre-charging contactors, pre-charging resistors, capacitors, negative contactors and other devices to form a pre-charging circuit before applying high voltage to the battery pack to pre-charge the capacitor with a small current, thereby avoiding damage to the circuit by large current.

[0003] Although battery self-heating and pre-charging technologies can improve the charging and discharging performance of the battery pack, the two are implemented in completely different ways and require different hardware implementations, resulting in low integration of the pulse circuit. Summary of the invention

[0004] The embodiments of the present application provide a pulse circuit, a control method and a vehicle, which realize the integration of battery pack self-heating and pre-charging technology, improve the integration of the pulse circuit, and at least partially solve the above-mentioned technical problems.

[0005] In order to achieve the above-mentioned object, according to a first aspect of the present application, a pulse circuit is provided, comprising a pre-charging module, a first switching circuit, an energy connection terminal and a capacitive energy storage device;

[0006] The pre-charging module, the energy connection end and the capacitive energy storage device are connected to each other;

[0007] The first end of the first switch circuit is located between the energy connection end and the capacitive energy storage device, and the second end of the first switch circuit is connected to the pre-charging module;

[0008] The first switch circuit and the pre-charging module are turned on and off to generate a pulse current; the energy connection end is suitable for inputting or outputting energy of the pulse circuit.

[0009] Optionally, the pre-charging module includes a main switch circuit, a pre-charging circuit and a second switch circuit;

[0010] After the pre-charging circuit and the second switch circuit are connected in parallel with the main switch circuit, the second end of the first switch circuit is located between the pre-charging circuit and the second switch circuit.

[0011] Optionally, the main switch circuit includes at least two transistors connected in series, and the conduction directions of the two transistors connected in series are opposite.

[0012] Optionally, the at least two transistors connected in series are a first transistor and a second transistor;

[0013] The first transistor comprises a control electrode for connecting to an external controller, a first electrode connected to the pre-charging circuit and the energy connection terminal, and a second electrode connected to the second transistor;

[0014] The second transistor includes a control electrode for connecting to an external controller, a first electrode connected to the capacitive energy storage device and the second switch circuit, and a second electrode connected to the first transistor.

[0015] Optionally, the main switch circuit includes at least two switches connected in parallel, and the conduction directions of the at least two switches connected in parallel are opposite.

[0016] Optionally, at least two parallel switches include: a first switch consisting of at least one third transistor and at least one first unidirectional conductive device, and a second switch consisting of at least one fourth transistor and at least one second unidirectional conductive device; at least one of the third transistors and at least one of the first unidirectional conductive devices have the same conduction direction; at least one of the fourth transistors and at least one of the second unidirectional conductive devices have the same conduction direction.

[0017] Optionally, the third transistor includes a control electrode connected to an external controller, a first electrode connected to the energy connection terminal, the pre-charging circuit and the fourth transistor, and a second electrode connected to the first end of the first unidirectional conductive device;

[0018] The fourth transistor comprises a control electrode for connecting to an external controller, a first electrode connected to the second end of the second unidirectional conductive device, and a second electrode connected to the energy connection end, the pre-charging circuit and the third transistor;

[0019] The second end of the first unidirectional conducting component is connected to the first end of the second unidirectional conducting component.

[0020] Optionally, the pre-charging circuit includes an inductor and a first switching transistor;

[0021] The first switching transistor comprises a control electrode for connecting to an external controller, a first electrode connected to a first end of the inductor device, and a second electrode connected to the energy connection end and the main switching circuit;

[0022] The second end of the inductor is connected to the first switch circuit and the second switch circuit.

[0023] Optionally, the second switch circuit includes a second switch transistor;

[0024] The second switch transistor includes a control electrode for connecting to an external controller, a first electrode connected to the second end of the inductor device and the first switch circuit, and a second electrode connected to the main switch circuit and a first end of the capacitive energy storage device.

[0025] Optionally, the first switch circuit includes a third switch transistor;

[0026] The third switching transistor comprises a control electrode for connecting to an external controller, a first electrode connected to the energy connection terminal and the second end of the capacitive energy storage device, and a second electrode connected to the second end of the inductive device and the second switching transistor.

[0027] Optionally, a contactor circuit is further included, wherein the contactor circuit is connected in series between the energy connection end and the first switch circuit.

[0028] Optionally, the pre-charging module is arranged at the first end of the energy connection end, and the contactor circuit includes a positive contactor, which is connected in series at the second end of the energy connection end; or, the pre-charging module is arranged at the second end of the energy connection end, and the contactor circuit includes a negative contactor, which is connected in series at the first end of the energy connection end.

[0029] Optionally, the energy connection terminal is suitable for connecting to a battery pack, and the main switch circuit is suitable for connecting to the negative electrode or the positive electrode of the battery pack.

[0030] According to a second aspect of the present application, a pulse circuit control method is provided for controlling the above-mentioned pulse circuit, the method comprising:

[0031] The on and off of the first switch circuit and the pre-charging module are controlled so that the pulse circuit generates a pulse current.

[0032] Optionally, when the second switch circuit is disconnected, the capacitive energy storage device generates a pulse or energy is input to the capacitive energy storage device.

[0033] Optionally, when the second switch circuit is disconnected, the capacitive energy storage device generates a pulse or energy is input to the capacitive energy storage device, including: when the first switch circuit is turned on and the second switch circuit and the main switch circuit are disconnected, the capacitive energy storage device generates a pulse or energy is input to the capacitive energy storage device.

[0034] Optionally, when the first switch circuit is turned on and the second switch circuit and the main switch circuit are turned off, the capacitive energy storage device generates a pulse, or inputs energy to the capacitive energy storage device, including:

[0035] When the body diode of the third switch transistor is turned on, the capacitive energy storage device inputs energy;

[0036] When the third switching transistor is turned on, the capacitive energy storage device generates a pulse.

[0037] Optionally, when the second switch circuit is turned on, the capacitive energy storage device is disconnected, and the inductive device generates a pulse or energy is input to the inductive device.

[0038] Optionally, when the second switch circuit is turned on, the capacitive energy storage device is disconnected, and the inductor device generates a pulse or energy is input to the inductor device, including: when the second switch circuit is turned on and the first switch circuit and the main switch circuit are disconnected, the capacitive energy storage device is disconnected, and the inductor device generates a pulse or energy is input to the inductor device.

[0039] Optionally, when the second switch circuit is turned on and the first switch circuit and the main switch circuit are turned off, the capacitive energy storage device is turned off, and the inductor device generates a pulse or inputs energy to the inductor device, including:

[0040] When the second switch transistor is turned on, the capacitive energy storage device is turned off, and the inductive device inputs energy;

[0041] When the body diode of the second switching transistor is turned on, the capacitive energy storage device is turned off and the inductive device generates a pulse.

[0042] Optionally, when the second switch circuit is disconnected, the pulse circuit is pre-charged.

[0043] Optionally, when the second switch circuit is disconnected, the pulse circuit performs pre-charging, including: when the first switch circuit is turned on and the second switch circuit is disconnected, the pulse circuit performs pre-charging.

[0044] Optionally, the pulse current is suitable for heating the battery pack.

[0045] According to a third aspect of the present application, an electronic device is provided, comprising the above-mentioned pulse circuit.

[0046] According to a fourth aspect of the present application, a storage medium is provided, comprising a computer program that can be loaded by a processor and executed as in the pulse circuit control method described above.

[0047] According to a fifth aspect of the present application, a controller is provided for executing a computer program of the pulse circuit control method as described above.

[0048] Pulse Current According to a sixth aspect of the present application, a vehicle is provided, comprising the above-mentioned pulse circuit.

[0049] In the pulse circuit of the embodiment of the present application, the pre-charging of the capacitive energy storage device is achieved by switching the on / off state between the pre-charging module and the capacitive energy storage device. By controlling the on / off state of the pre-charging module and the first switch circuit, a pulse current is generated, and the pulse current is used to self-heat the battery pack, thereby realizing the integration of the pre-charging function and the self-heating function of the battery pack without setting up additional hardware facilities such as components, thereby improving the integration of the pulse circuit.

[0050] Other features and advantages of the present application will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0052] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same figure numbers represent the same parts in the following description.

[0053] Figure 1 is a schematic diagram of a pulse circuit provided in an exemplary embodiment of the present disclosure.

[0054] Figure 2 is a schematic diagram of a pulse circuit provided in another exemplary embodiment of the present disclosure.

[0055] Figure 3 2 is a connection structure diagram of a pulse circuit provided in the first exemplary embodiment of the present disclosure.

[0056] Figure 4 2 is a connection structure diagram of a pulse circuit provided in the second exemplary embodiment of the present disclosure.

[0057] Figure 5 2 is a connection structure diagram of a pulse circuit provided in the third exemplary embodiment of the present disclosure.

[0058] Figure 6 2 is a connection structure diagram of a pulse circuit provided in a fourth exemplary embodiment of the present disclosure.

[0059] Explanation of the accompanying drawings: 1. Pre-charging module; 11. Main switch circuit; 12. Pre-charging circuit; 13. Second switch circuit; 2. First switch circuit; 3. Capacitive energy storage device; 4. Contactor circuit. DETAILED DESCRIPTION

[0060] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0061] According to the first aspect of the present application, referring to Figure 1 and Figure 2 The present disclosure provides a pulse circuit, including a pre-charging module 1, a first switching circuit 2, an energy connection terminal and a capacitive energy storage device 3.

[0062] Among them, the pre-charging module 1, the energy connection end and the capacitive energy storage device 3 are interconnected; the first end of the first switching circuit 2 is located between the energy connection end and the capacitive energy storage device 3, and the second end of the first switching circuit 2 is connected to the pre-charging module 1; a pulse current is generated by turning on and off the first switching circuit 2 and the pre-charging module 1; the energy connection end is suitable for the input or output of pulse circuit energy.

[0063] The energy connection terminal is suitable for connecting a battery pack.

[0064] The capacitive energy storage device 3 may include one or more capacitors, and the capacitive energy storage device 3 is arranged on a DC bus of a high-voltage circuit, and the DC bus of the high-voltage circuit is used for transmission and distribution of electric energy in the vehicle. The switching of the conduction direction between the battery pack and the capacitive energy storage device 3 is jointly controlled by the pre-charging module 1 and the first switch circuit 2.

[0065] As an example, when pre-charging is required, the pre-charging module 1 and the capacitive energy storage device 3 are controlled to be connected to each other, so that the battery pack discharges to the capacitive energy storage device 3 through the pre-charging module 1 through the energy connection terminal to achieve pre-charging of the capacitive energy storage device 3.

[0066] As an example, when the battery pack needs to self-heat, the first switch circuit 2 and the pre-charging module 1 are turned on and off to generate a pulse current, which is transmitted to the battery cells of the battery pack through the energy connection end. Since the battery cells have internal resistance, the battery cells will generate heat when the pulse current passes through the battery cells, thereby achieving self-heating of the battery pack.

[0067] In the above embodiment, the precharging of the capacitive energy storage device 3 is achieved by switching the on / off state between the precharging module 1 and the capacitive energy storage device 3. By controlling the on / off state of the precharging module 1 and the first switch circuit 2, a pulse current is generated, and the pulse current is used to self-heat the battery pack, thereby realizing the integration of the precharging function and the self-heating function of the battery pack without setting up additional hardware facilities such as components, thereby improving the integration of the pulse circuit.

[0068] Reference Figures 2 to 6 As an embodiment, the pre-charging module includes a main switch circuit 11, a pre-charging circuit 12 and a second switch circuit 13; after the pre-charging circuit 12 and the second switch circuit 13 are connected in parallel with the main switch circuit 11, the second end of the first switch circuit 2 is located between the pre-charging circuit 12 and the second switch circuit 13.

[0069] The main switch circuit is suitable for connecting to the negative electrode or the positive electrode of the battery pack.

[0070] As an embodiment, the main switch circuit 11 includes at least two transistors connected in series, and the conduction directions of the two transistors connected in series are opposite.

[0071] Combination Figure 3 and Figure 5 , as an example, the at least two transistors connected in series are a first transistor Q1 and a second transistor Q2;

[0072] Among them, the first transistor Q1 includes a control electrode for connecting to an external controller, a first electrode connected to the pre-charging circuit and the energy connection end, and a second electrode connected to the second transistor Q2; the second transistor Q2 includes a control electrode for connecting to an external controller, a first electrode connected to the capacitive energy storage device 3 and the second switching circuit 13, and a second electrode connected to the first transistor Q1.

[0073] Combination Figure 4 and Figure 6 As an example, in the process of outputting energy at the energy connection end, the first transistor Q1 is turned on and the second transistor Q2 is turned off, so that the body diode of the first transistor Q1 and the second transistor Q2 constitute the energy output path of the energy connection end. In the process of inputting energy at the energy connection end, the first transistor Q1 is turned off and the second transistor Q2 is turned on, so that the body diode of the first transistor Q1 and the second transistor Q2 constitute the energy input path of the energy connection end.

[0074] As another embodiment, the main switch circuit 11 includes at least two switches connected in parallel, and the conduction directions of the at least two switches connected in parallel are opposite.

[0075] As an example, at least two parallel switches include: a first switch consisting of at least one third transistor Q3 and at least one first unidirectional conductive device D1, and a second switch consisting of at least one fourth transistor Q4 and at least one second unidirectional conductive device D2; the conduction direction of at least one third transistor Q3 and at least one first unidirectional conductive device D1 is the same; the conduction direction of at least one fourth transistor Q4 and at least one second unidirectional conductive device D2 is the same.

[0076] As an example, the third transistor Q3 includes a control electrode for connecting to an external controller, a first electrode connected to an energy connection terminal, a pre-charging circuit 12 and the fourth transistor Q4, and a second electrode connected to the first end of the first unidirectional conductive device D1; the fourth transistor Q4 includes a control electrode for connecting to an external controller, a first electrode connected to the second end of the second unidirectional conductive device D2, and a second electrode connected to the energy connection terminal, the pre-charging circuit 12 and the third transistor Q3; the second end of the first unidirectional conductive device D1 is connected to the first end of the second unidirectional conductive device D2.

[0077] As an example, in the process of outputting energy from the energy connection end, the third transistor Q3 is turned on, the fourth transistor Q4 is turned off, and the third transistor Q3 and the first unidirectional conductive device D1 constitute the output energy path of the energy connection end, and the conduction direction is the discharge direction of the energy connection end. In the process of inputting energy to the energy connection end, the third transistor Q3 is turned off, and the fourth transistor Q4 is turned on, so that the fourth transistor Q4 and the second unidirectional conductive device D2 constitute the energy input path of the energy connection end, and the conduction direction is the charging direction of the energy connection end. When the third transistor Q3 and the fourth transistor Q4 are turned off at the same time, the energy connection end is disconnected.

[0078] The third transistor Q3 and the fourth transistor Q4 may have a body diode or may not have a body diode. When the third transistor Q3 and the fourth transistor Q4 have a body diode, the conduction direction of the first unidirectional conduction device D1 is opposite to the conduction direction of the body diode of the third transistor Q3, and the conduction direction of the second unidirectional conduction device D2 is opposite to the conduction direction of the body diode of the fourth transistor Q4, so as to prevent the backflow of current.

[0079] Reference Figure 1 and Figure 2 In some embodiments, a contactor circuit 4 is further included, wherein the contactor circuit 4 is connected in series between the energy connection end and the first switch circuit 2 .

[0080] As an example, the pre-charging module 1 is set at the first end of the energy connection end, and the contactor circuit 4 includes a positive contactor KM1, which is connected in series to the second end of the energy connection end; or, the pre-charging module 1 is set at the second end of the energy connection end, and the contactor circuit 4 includes a negative contactor KM2, which is connected in series to the first end of the energy connection end.

[0081] The first end of the energy connection terminal can be used to connect to the negative electrode of the battery pack, and the second end of the energy connection terminal can be used to connect to the positive electrode of the battery pack.

[0082] Combination Figure 1 and Figure 3 As an example, the pre-charging module 1 is arranged at the first end of the energy connection end, and the positive contactor KM1 is connected in series at the second end of the energy connection end, so that the battery pack and the capacitive energy storage device 3 are connected in a low-side pre-charging manner, and the pre-charging of the capacitive energy storage device 3 is achieved by controlling the on and off of the pre-charging module 1, thereby forming a controllable pre-charging current path between the negative electrode of the battery pack and the capacitive energy storage device 3. Since the pre-charging module 1 is connected to the negative electrode of the battery pack, the pre-charging module 1 usually does not need to withstand a higher voltage in the low-side pre-charging manner, so that the cost of the pre-charging module 1 is relatively low.

[0083] Combination Figure 2 and Figure 5 As an example, the pre-charging module 1 is arranged at the second end of the energy connection end, the negative contactor KM2 is connected in series to the first end of the energy connection end, the pre-charging module 1 can be connected to the positive pole of the battery pack, and the contactor circuit 4 can be connected in series between the negative pole of the battery pack and the pre-charging module 1, so that the battery pack and the capacitive energy storage device 3 are connected in a high-side pre-charging manner, and the capacitive energy storage device 3 is pre-charged by controlling the on and off of the pre-charging module 1, thereby forming a controllable pre-charging current path between the positive pole of the battery pack and the capacitive energy storage device 3. Since the pre-charging module 1 is connected to the positive pole of the battery pack, in the high-side pre-charging manner, the connection between the battery pack and the capacitive energy storage device 3 can be cut off by the pre-charging module 1, effectively isolating the battery pack and the load, and having higher safety.

[0084] In some embodiments, the pre-charging circuit 12 includes an inductor and a first switch transistor. The first switch transistor includes a control electrode for connecting to an external controller, a first electrode connected to a first end of the inductor, and a second electrode connected to the energy connection end and the main switch circuit; the second end of the inductor is connected to the first switch circuit 2 and the second switch circuit 13.

[0085] As an example, when the battery pack needs to be self-heated, by controlling the on and off of the first switch circuit 2 and the second switch 13, the inductor and the capacitive energy storage device 3 can be repeatedly switched on and off, and the flow direction of the current can be switched, that is, the battery pack first outputs energy to the inductor and the capacitive energy storage device 3, so that the charging of the capacitive energy storage device 3 and the energy storage of the inductor are continuously increased, and the current of the battery pack is gradually reduced until the battery pack stops discharging. Then, the inductor and the capacitive energy storage device are reversely discharged to the battery pack, so that the direction of the current flowing through the battery pack is changed, and the conduction direction between the battery pack, the inductor and the capacitive energy storage device 3 is repeatedly switched, that is, an oscillation circuit can be formed, thereby generating a pulse current for heating the battery cell of the battery pack.

[0086] The inductance of the inductive device and the capacitance of the capacitive energy storage device 3 can be set according to actual conditions. During the self-heating process, the frequency of the pulse current output by the oscillation circuit composed of the inductive device and the capacitive energy storage device 3 can be expressed as: f = 1 / (2π√(LC)); wherein L represents the inductance of the inductive device and C represents the capacitance of the capacitive energy storage device 3. Therefore, by adjusting the inductance of the inductive device and the capacitance of the capacitive energy storage device 3, the frequency of the pulse current can be controlled to optimize the self-heating effect on the battery cell.

[0087] Among them, since the inductor has the characteristics of inductance, the current at both ends of the inductor cannot change suddenly, which avoids the large current flowing directly to the capacitive energy storage device 3 during the pre-charging process, so as to complete the pre-charging of the capacitive energy storage device 3, so that the voltage of the capacitive energy storage device 3 is close to the output voltage of the battery pack, so that the subsequent battery pack can be stably powered by the capacitive energy storage device 3.

[0088] Reference Figures 3 to 6 In some embodiments, the second switching circuit 13 includes a second switching transistor; the second switching transistor includes a control electrode for connecting to an external controller, a first electrode connected to the second end of the inductor device and the first switching circuit, and a second electrode connected to the main switching circuit and the first end of the capacitive energy storage device.

[0089] In some embodiments, the first switching circuit 2 includes a third switching transistor; the third switching transistor includes a control electrode for connecting to an external controller, a first electrode connected to the energy connection end and the second end of the capacitive energy storage device 3, and a second electrode connected to the second end of the inductive device and the second switching transistor.

[0090] As an example, in the case where a low-side pre-charging method is adopted between the battery pack and the capacitive energy storage device 3, the inductive device includes a first inductor L1, the first switching transistor includes a fifth transistor Q5 having a body diode, and the second switching transistor includes a sixth transistor Q6. The fifth transistor Q5 includes a control electrode for connecting to an external controller, a first electrode connected to the first end of the first inductor L1, and a second electrode connected to the first end of the energy connection end and the main switch circuit 11. The sixth transistor Q6 includes a control electrode for connecting to an external controller, a first electrode connected to the second end of the first inductor L1 and the seventh transistor Q7, and a second electrode connected to the main switch circuit 11 and the first end of the capacitive energy storage device 3. The seventh transistor Q7 includes a control electrode for connecting to an external controller, a first electrode connected to the positive contactor KM1 and the second end of the capacitive energy storage device 3, and a second electrode connected to the second end of the first inductor L1 and the sixth transistor Q6.

[0091] Combination Figure 3 and Figure 4 As an example, when a low-side pre-charging method is adopted between the battery pack and the capacitive energy storage device 3, during the pre-charging process, the fifth transistor Q5 is turned on, so that the current flows from the battery pack to the capacitive energy storage device 3 through the fifth transistor Q5, the first inductor L1 and the body diode of the sixth transistor Q6 in sequence, so that the battery pack, the positive contactor KM1, the capacitive energy storage device 3 and the first inductor L1 together constitute a pre-charging path to pre-charge the capacitive energy storage device 3.

[0092] As an example, when a low-side pre-charging method is adopted between the battery pack and the capacitive energy storage device 3, the self-heating process of the battery pack can be divided into four stages. In the first stage, the fifth transistor Q5 and the seventh transistor Q7 are turned on, and the battery pack, the positive contactor KM1 and the first inductor L1 form a closed loop. At this time, the conduction direction of the battery pack is the discharge direction, and the battery pack discharges to the first inductor L1 so that the first inductor L1 stores energy. In the second stage, the fifth transistor Q5 is turned on, so that the first end of the first inductor L1 is conducted to the negative electrode of the battery pack, and the other end of the first inductor L1 is conducted to the positive electrode of the battery pack through the body diode of the seventh transistor Q7 after the positive contactor KM1 is closed, so that there is a voltage difference between the two ends of the first inductor L1. At this time, the first inductor L1 and the battery pack discharge to the capacitive energy storage device 3 at the same time, and the conduction direction of the battery pack is the discharge direction. In the third stage, the fifth transistor Q5 and the seventh transistor Q7 are turned on, and the capacitive energy storage device 3 discharges to the first inductor L1 through the seventh transistor Q7. At the same time, the positive contactor KM1 is closed, so that the capacitive energy storage device 3 discharges to the battery pack through the positive contactor KM1. At this time, the conduction direction of the battery pack is the charging direction. In the fourth stage, the first inductor L1 is connected to the battery pack through the body diode of the fifth transistor Q5 and the body diode of the seventh transistor Q7 to discharge to the battery pack. At this time, the conduction direction of the battery pack is the charging direction of the battery pack. The above four stages constitute a complete oscillation cycle. The above four stages are repeated so that the direction of the current flowing through the battery pack is constantly changed, thereby achieving the effect of providing pulse current to the battery cells in the battery pack to heat the battery cells.

[0093] Among them, by adjusting the conduction duty cycle of the fifth transistor Q5, the sixth transistor Q6 and the seventh transistor Q7, the current adjustment is achieved during the pre-charging process and the self-heating process of the battery pack, so as to use appropriate current for pre-charging and self-heating.

[0094] Combination Figure 5 and Figure 6As another example, in the case where a high-side pre-charging method is adopted between the battery pack and the capacitive energy storage device 3, the inductive device includes a second inductor L2, the first switching transistor includes an eighth transistor Q8 having a body diode, and the second switching transistor includes a tenth transistor Q10. Among them, the eighth transistor Q8 includes a control electrode for connecting to an external controller, a first electrode connected to the second end of the energy connection end and the main switch circuit 11, and a second electrode connected to the first end of the second inductor L2. The ninth transistor Q9 includes a control electrode for connecting to an external controller, a first electrode connected to the main switch circuit 11 and the capacitive energy storage device 3, and a second electrode connected to the second end of the second inductor L2 and the tenth transistor Q10. The tenth transistor Q10 includes a control electrode for connecting to an external controller, a first electrode connected to the second end of the second inductor L2 and the ninth transistor Q9, and a second electrode connected to the negative contactor KM2 and the capacitive energy storage device 3.

[0095] As an example, when a high-side pre-charging method is adopted between the battery pack and the capacitive energy storage device 3, during the pre-charging process, the eighth transistor Q8 is turned on, so that the current flows from the battery pack to the capacitive energy storage device 3 through the eighth transistor Q8, the first inductor L1 and the body diode of the ninth transistor Q9 in sequence, so that the battery pack, the second inductor L2, the capacitive energy storage device 3, the body diode of the ninth transistor Q9 and the negative contactor KM2 together constitute a pre-charging path to pre-charge the capacitive energy storage device 3.

[0096] As an example, in the case where a high-side pre-charging method is adopted between the battery pack and the capacitive energy storage device 3, the self-heating process of the battery pack can be divided into four stages. In the first stage, the eighth transistor Q8 and the tenth transistor Q10 are turned on, and the battery pack, the eighth transistor Q8, the second inductor L2, the tenth transistor Q10 and the negative contactor KM2 form a closed loop. At this time, the conduction direction of the battery pack is the discharge direction, and the battery pack discharges to the second inductor L2 so that the second inductor L2 stores energy. In the second stage, the eighth transistor Q8 is turned on, so that the first end of the second inductor L2 is conducted to the positive electrode of the battery pack, and the other end of the second inductor L2 is conducted to the capacitive energy storage device 3 through the body diode of the ninth transistor Q9. Since the capacitive energy storage device 3 has not yet stored energy at this time, there is a voltage difference between the two ends of the second inductor L2, so that the second inductor L2 and the battery pack discharge to the capacitive energy storage device 3 at the same time, and the conduction direction of the battery pack is the discharge direction. In the third stage, the ninth transistor Q9 is turned on, and the capacitive energy storage device 3 discharges to the second inductor L2 through the ninth transistor Q9, and at the same time discharges to the battery pack through the body diode of the eighth transistor Q8. At this time, the conduction direction of the battery pack is the charging direction. In the fourth stage, the second inductor L2 is connected to the battery pack through the body diode of the eighth transistor Q8 and the body diode of the tenth transistor Q10 to discharge to the battery pack. At this time, the conduction direction of the battery pack is the charging direction of the battery pack. The above four stages constitute a complete oscillation cycle. The above four stages are repeated so that the direction of the current flowing through the battery pack is constantly changed, thereby achieving the effect of providing pulse current to the battery cells in the battery pack to heat the battery cells.

[0097] In the above embodiment, by controlling the on and off of the eighth transistor Q8, the ninth transistor Q9 and the tenth transistor Q10, the eighth transistor Q8, the ninth transistor Q9 and the tenth transistor Q10 are placed in different on and off state combinations, thereby achieving control of pre-charging the capacitive energy storage device 3 or self-heating the battery pack.

[0098] Among them, the external controller is used to output external control instructions, and the external control instructions can be a combination of multiple control signals. For example, the external control instructions can include five independent control signals, of which two control signals are used together to control the on and off and conduction direction of the main switch circuit 11, and the other three control signals can be used together to control the on and off and conduction direction of the pre-charging module 1.

[0099] The control electrodes of the first transistor Q1 to the tenth transistor Q10 may be gate electrodes thereof, one of the first electrode and the second electrode may be a source electrode, and the other may be a drain electrode.

[0100] According to a second aspect of the present application, a pulse circuit control method is provided for controlling the above-mentioned pulse circuit, the method comprising: controlling the on and off of the first switch circuit and the pre-charge module so that the pulse circuit generates a pulse current.

[0101] In some embodiments, when the second switch circuit is opened, the capacitive energy storage device generates a pulse or energy is input to the capacitive energy storage device.

[0102] As an example, when the second switching circuit is disconnected, the capacitive energy storage device generates a pulse or energy is input to the capacitive energy storage device, including: when the first switching circuit is turned on and the second switching circuit and the main switching circuit are disconnected, the capacitive energy storage device generates a pulse or energy is input to the capacitive energy storage device.

[0103] As an example, when the first switch circuit is turned on and the second switch circuit and the main switch circuit are turned off, the capacitive energy storage device generates a pulse, or energy is input to the capacitive energy storage device, including:

[0104] Step S101: when the body diode of the third switch transistor is turned on, the capacitive energy storage device inputs energy.

[0105] When the body diode of the third switch transistor is turned on, the battery pack, the pre-charging circuit, the body diode of the third switch transistor and the capacitive energy storage device are turned on to form a complete loop, and the conduction direction is the discharge direction of the battery pack.

[0106] Step S102: when the third switch transistor is turned on, the capacitive energy storage device generates a pulse.

[0107] When the body diode of the third switch transistor is turned on, the battery pack, the pre-charging circuit, the third switch transistor and the capacitive energy storage device are connected to form a complete loop, and the conduction direction is the charging direction of the battery pack.

[0108] In some embodiments, when the second switch circuit is turned on, the capacitive energy storage device is disconnected, and the inductive device generates a pulse or energy is input to the inductive device.

[0109] In some embodiments, when the second switch circuit is turned on, the capacitive energy storage device is disconnected, and the inductor device generates a pulse or energy is input to the inductor device, including: when the second switch circuit is turned on and the first switch circuit and the main switch circuit are disconnected, the capacitive energy storage device is disconnected, and the inductor device generates a pulse or energy is input to the inductor device.

[0110] As an example, when the second switch circuit is turned on and the first switch circuit and the main switch circuit are turned off, the capacitive energy storage device is turned off, and the inductive device generates a pulse or inputs energy to the inductive device, including:

[0111] Step S201: when the second switch transistor is turned on, the capacitive energy storage device is turned off, and the inductive device inputs energy.

[0112] When the second switch transistor is turned on, the battery pack, the inductor device and the second switch transistor form a complete loop, and the conduction direction is the discharge direction of the battery pack to discharge and store energy to the inductor device.

[0113] Step S202: when the body diode of the second switch transistor is turned on, the capacitive energy storage device is turned off, and the inductive device generates a pulse.

[0114] When the body diode of the second switch transistor is turned on, the battery pack, the inductor and the body diode of the second switch transistor form a complete loop, and the conduction direction is the charging direction of the battery pack, so that the inductor discharges to the battery pack.

[0115] When the second switch circuit is disconnected, the pulse circuit is pre-charged.

[0116] Wherein, when the second switch circuit is disconnected, the pulse circuit is pre-charged, including: when the first switch circuit is turned on and the second switch circuit is disconnected, the pulse circuit is pre-charged.

[0117] The current is suitable for heating the battery pack.

[0118] According to a third aspect of the present application, an electronic device is provided, comprising the above-mentioned pulse circuit.

[0119] According to a fourth aspect of the present application, a storage medium is provided, comprising a computer program that can be loaded by a processor and executed as in the pulse circuit control method described above.

[0120] According to a fifth aspect of the present application, a controller is provided for executing a computer program of the pulse circuit control method as described above.

[0121] According to a sixth aspect of the present application, a vehicle is provided, comprising the above-mentioned pulse circuit.

[0122] The vehicle may be a fuel vehicle, a plug-in hybrid vehicle, a new energy vehicle, etc., and the present disclosure does not make any specific limitation on this.

[0123] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0124] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0125] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0126] The above are only preferred embodiments of the present application and do not constitute any form of limitation to the present application. Although the descriptions of various embodiments in the embodiments of the present application have different focuses, parts that are not described in detail in a certain embodiment can be referred to other embodiments. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A pulse circuit, characterized in that: It comprises a pre-charging module (1), a first switch circuit (2), an energy connection terminal and a capacitive energy storage device (3); The first end of the pre-charging module (1) is connected to the energy connection end, and the second end is connected to the capacitive energy storage device (3); The first end of the first switch circuit (2) is located between the energy connection end and the capacitive energy storage device (3), and the second end of the first switch circuit (2) is connected to the pre-charging module (1); A pulse current is generated by switching the first switch circuit (2) and the pre-charging module (1) on and off; the energy connection end is suitable for inputting or outputting energy of the pulse circuit; The pre-charging module (1) comprises a pre-charging circuit (12); the pre-charging circuit (12) comprises an inductor (L1 / L2) and a first switch transistor (Q5 / Q8); the inductor (L1 / L2) and the first switch transistor (Q5 / Q8) are connected in series between a first end and a second end of the pre-charging module (1); and the inductor (L1 / L2) and the capacitive energy storage device (3) form an oscillating circuit to output a pulse current.

2. The pulse circuit according to claim 1, characterized in that: The pre-charging module (1) comprises a main switch circuit (11) and a second switch circuit (13); After the pre-charging circuit (12) and the second switch circuit (13) are connected in parallel with the main switch circuit (11), the second end of the first switch circuit (2) is located between the pre-charging circuit (12) and the second switch circuit (13).

3. The pulse circuit according to claim 2, characterized in that: The main switch circuit (11) comprises at least two transistors connected in series, and the conduction directions of the two transistors connected in series are opposite.

4. The pulse circuit according to claim 3, characterized in that: The at least two transistors connected in series are a first transistor (Q1) and a second transistor (Q2); The first transistor (Q1) comprises a control electrode for connecting to an external controller, a first electrode connected to the pre-charging circuit (12) and the energy connection terminal, and a second electrode connected to the second transistor (Q2); The second transistor (Q2) comprises a control electrode for connecting to an external controller, a first electrode connected to the capacitive energy storage device (3) and the second switch circuit (13), and a second electrode connected to the first transistor (Q1).

5. The pulse circuit according to claim 2, characterized in that: The main switch circuit (11) comprises at least two switches connected in parallel, and the conduction directions of the at least two switches connected in parallel are opposite.

6. The pulse circuit according to claim 5, characterized in that: At least two switches connected in parallel include: a first switch composed of at least one third transistor (Q3) and at least one first unidirectional conductive device (D1), and a second switch composed of at least one fourth transistor (Q4) and at least one second unidirectional conductive device (D2); at least one of the third transistors (Q3) and at least one of the first unidirectional conductive devices (D1) have the same conduction direction; at least one of the fourth transistors (Q4) and at least one of the second unidirectional conductive devices (D2) have the same conduction direction.

7. The pulse circuit according to claim 6, characterized in that: The third transistor (Q3) comprises a control electrode for connecting to an external controller, a first electrode connected to the energy connection terminal, the pre-charging circuit (12) and the fourth transistor (Q4), and a second electrode connected to the first end of the first unidirectional conductive device (D1); The fourth transistor (Q4) comprises a control electrode for connecting to an external controller, a first electrode connected to the second end of the second unidirectional conductive device (D2), and a second electrode connected to the energy connection end, the pre-charging circuit (12) and the third transistor (Q3); The second end of the first unidirectional conducting device (D1) is connected to the first end of the second unidirectional conducting device (D2).

8. The pulse circuit according to claim 2, characterized in that: The first switching transistor (Q5 / Q8) comprises a control electrode for connecting to an external controller, a first electrode connected to a first end of the inductor (L1 / L2), and a second electrode connected to the energy connection end and the main switching circuit (11); The second end of the inductor (L1 / L2) is connected to the first switch circuit (2) and the second switch circuit (13).

9. The pulse circuit according to claim 8, characterized in that: The second switch circuit (13) comprises a second switch transistor (Q6 / Q10); The second switching transistor (Q6 / Q10) comprises a control electrode for connecting to an external controller, a first electrode connected to the second end of the inductor device (L1 / L2) and the first switching circuit (2), and a second electrode connected to the main switching circuit (11) and the first end of the capacitive energy storage device (3).

10. The pulse circuit according to claim 9, characterized in that: The first switch circuit (2) comprises a third switch transistor (Q7 / Q9); The third switching transistor (Q7 / Q9) comprises a control electrode for connecting to an external controller, a first electrode connected to the energy connection terminal and the second end of the capacitive energy storage device (3), and a second electrode connected to the second end of the inductor device (L1 / L2) and the second switching transistor (Q6 / Q10).

11. The pulse circuit according to any one of claims 2 to 10, characterized in that: It also includes a contactor circuit (4), which is connected in series between the energy connection end and the first switch circuit (2).

12. The pulse circuit according to claim 11, characterized in that: The pre-charging module (1) is arranged at the first end of the energy connection end, and the contactor circuit (4) includes a positive contactor (KM1), and the positive contactor (KM1) is connected in series to the second end of the energy connection end; or, the pre-charging module (1) is arranged at the second end of the energy connection end, and the contactor circuit (4) includes a negative contactor (KM2), and the negative contactor (KM2) is connected in series to the first end of the energy connection end.

13. The pulse circuit according to claim 11, characterized in that: The energy connection terminal is suitable for connecting to a battery pack, and the main switch circuit (11) is suitable for connecting to the negative pole or the positive pole of the battery pack.

14. A pulse circuit control method, used to control the pulse circuit according to any one of claims 1 to 13, characterized in that: The method comprises: The on and off of the first switch circuit (2) and the pre-charging module (1) are controlled so that the pulse circuit generates a pulse current.

15. The pulse circuit control method according to claim 14, characterized in that: When the second switch circuit (13) is disconnected, the capacitive energy storage device (3) generates a pulse or inputs energy into the capacitive energy storage device (3).

16. The pulse circuit control method according to claim 15, characterized in that: When the second switch circuit (13) is disconnected, the capacitive energy storage device (3) generates a pulse or inputs energy into the capacitive energy storage device (3), comprising: when the first switch circuit (2) is turned on and the second switch circuit (13) and the main switch circuit (11) are disconnected, the capacitive energy storage device (3) generates a pulse or inputs energy into the capacitive energy storage device (3).

17. The pulse circuit control method according to claim 16, characterized in that: When the first switch circuit (2) is turned on and the second switch circuit (13) and the main switch circuit (11) are turned off, the capacitive energy storage device (3) generates a pulse, or inputs energy to the capacitive energy storage device (3), comprising: When the body diode of the third switching transistor is turned on, the capacitive energy storage device (3) inputs energy; When the third switching transistor is turned on, the capacitive energy storage device (3) generates a pulse.

18. The pulse circuit control method according to claim 14, characterized in that: When the second switch circuit (13) is turned on, the capacitive energy storage device (3) is disconnected, and the inductive device generates a pulse or energy is input to the inductive device.

19. The pulse circuit control method according to claim 18, characterized in that: When the second switch circuit (13) is turned on, the capacitive energy storage device (3) is turned off, and the inductor device generates a pulse or inputs energy to the inductor device, comprising: when the second switch circuit (13) is turned on and the first switch circuit (2) and the main switch circuit (11) are turned off, the capacitive energy storage device (3) is turned off, and the inductor device generates a pulse or inputs energy to the inductor device.

20. The pulse circuit control method according to claim 18, characterized in that: When the second switch circuit (13) is turned on and the first switch circuit (2) and the main switch circuit (11) are turned off, the capacitive energy storage device (3) is turned off, and the inductor device generates a pulse or inputs energy to the inductor device, comprising: When the second switch transistor is turned on, the capacitive energy storage device (3) is disconnected, and the inductive device inputs energy; When the body diode of the second switching transistor is turned on, the capacitive energy storage device (3) is turned off and the inductive device generates a pulse.

21. The pulse circuit control method according to claim 14, characterized in that: When the second switch circuit (13) is disconnected, the pulse circuit is pre-charged.

22. The pulse circuit control method according to claim 21, characterized in that: When the second switch circuit (13) is disconnected, the pulse circuit performs pre-charging, including: when the first switch circuit (2) is turned on and the second switch circuit (13) is turned off, the pulse circuit performs pre-charging.

23. The pulse circuit control method according to any one of claims 14 to 20, characterized in that: The pulse current is suitable for heating the battery pack.

24. An electronic device, characterized in that: A pulse circuit comprising any one of claims 1 to 13.

25. A storage medium, characterized in that: The device comprises a computer program which can be loaded by a processor and execute the pulse circuit control method according to any one of claims 14 to 23.

26. A controller, characterized in that: A computer program for executing the pulse circuit control method according to any one of claims 14 to 23.

27. A vehicle, characterized in that: A pulse circuit comprising any one of claims 1 to 13.

Images