Battery energy processing device and vehicle

Abstract

The present disclosure relates to a battery energy processing device and a vehicle. The device includes: an inverter, an energy storage element and a controller; the controller is used to: in a first preset state, control the inverter to charge and discharge the energy storage element and the battery to realize battery self-heating; in a second preset state, reuse the energy storage element and the inverter to form a voltage adaptation charging module, and control the inverter to charge the battery. In this way, in the first preset state, the energy storage element is used to realize battery self-heating, better maintain the battery temperature, ensure the vehicle driving ability, and the self-heating energy loss is small, the heat transfer is uniform, and the heating efficiency is high. In the second preset state, the battery energy processing device can also reuse the energy storage element and the inverter to form a voltage adaptation charging module, and control the inverter to charge the battery. That is, the battery charging and battery self-heating share a set of battery energy processing devices, realizing the multi-functional reuse of the battery energy processing device, saving component costs and volume space.

Description

Technical Field

[0001] The present disclosure relates to the field of vehicle technology, and in particular, to a battery energy processing device and a vehicle. Background Art

[0002] At present, with the rapid development of electric vehicles, their application scenarios are becoming more and more extensive, and power batteries need to be able to adapt to various temperature changes. However, the performance of power batteries installed in electric vehicles is seriously degraded during the charging and discharging process in low temperature environments, resulting in limited capabilities of the drive system or charging system in low temperature environments, which seriously reduces the user experience.

[0003] In order to reduce the restrictions of low temperature environment on power batteries, some power battery heating solutions have been proposed. At the same time, the fast charging function of power batteries is also a necessary function for new energy vehicles.

[0004] Therefore, seeking a technical solution that takes into account both charging and heating functions is a technical problem that needs to be solved urgently. Summary of the invention

[0005] In order to overcome the problems existing in the related art, the present disclosure provides a battery energy processing device and a vehicle.

[0006] In order to achieve the above objectives, in a first aspect, the present disclosure provides a battery energy processing device, comprising:

[0007] Inverters, energy storage components and controllers;

[0008] Wherein, one end of the inverter is used to connect to the battery, and the other end is connected to the energy storage element;

[0009] The energy storage element is used to connect to an external power supply device;

[0010] The controller is connected to the inverter and is used for:

[0011] In a first preset state, controlling the inverter to charge and discharge the energy storage element and the battery to achieve self-heating of the battery;

[0012] In a second preset state, the energy storage element and the inverter are reused to form a voltage adaptation charging module, and the inverter is controlled to charge the battery.

[0013] Optionally, the inverter includes N-phase bridge arms, and the energy storage element includes N coils, where N≥2;

[0014] Among them, the first bus end of the N-phase bridge arm is connected to the positive electrode of the battery, the second bus end of the N-phase bridge arm is respectively connected to the negative electrode of the battery and the negative electrode of the external power supply device, the first ends of the N coils are connected one by one to the midpoint of the N-phase bridge arm, and the second ends of the N coils are connected together to form a neutral point, and the neutral point is used to be connected to the positive electrode of the external power supply device.

[0015] Optionally, the controller is used to:

[0016] In a first preset state, at least two phase bridge arms of the N phase bridge arms are controlled so that the coils among the N coils connected to the at least two phase bridge arms are charged and discharged with the battery to achieve self-heating of the battery;

[0017] In the second preset state, at least one coil among the N coils and at least one phase bridge arm correspondingly connected to the at least one coil are reused to form a voltage adaptation charging module, and at least one phase bridge arm of the N phase bridge arms is controlled to charge the battery.

[0018] Optionally, the controller is further used to detect whether the voltage of the external power supply device is less than the voltage of the battery;

[0019] The controller is used to:

[0020] In the second preset state, in response to detecting that the voltage of the external power supply device is lower than the voltage of the battery, at least one of the N coils and at least one phase bridge arm corresponding to the at least one coil are reused to form a voltage adaptation charging module, and the upper bridge arm of at least one phase bridge arm of the N phase bridge arm is controlled to be disconnected and the lower bridge arm of the at least one phase bridge arm is alternately turned on and off to boost charging the battery.

[0021] Optionally, the controller is further configured to:

[0022] In a second preset state, in response to detecting that the voltage of the external power supply device is not less than the voltage of the battery, the N-phase bridge arm is controlled to be disconnected to directly charge the battery.

[0023] Optionally, the device further includes: N first switches connected to the N coils in a one-to-one correspondence, wherein one end of the first switch is connected to the neutral point.

[0024] Optionally, the controller is used to:

[0025] In a first preset state, a first switch among the N first switches and connected to a first target coil is controlled to be closed, and at least two bridge arms of the N-phase bridge arms are controlled to charge and discharge the first target coil and the battery, so as to realize self-heating of the battery, wherein the first target coil includes a coil among the N coils and connected to the at least two bridge arms;

[0026] In the second preset state, at least one of the N coils and at least one phase bridge arm corresponding to the at least one coil are reused to form a voltage adaptation charging module, and the first switch of the N first switches corresponding to the at least one coil is controlled to be closed, and at least one phase bridge arm of the N phase bridge arms is controlled to charge the battery.

[0027] Optionally, the controller is further configured to detect whether each phase bridge arm in the N phase bridge arms is faulty in a second preset state;

[0028] The controller is used to, in the second preset state, multiplex the second target coil and the bridge arm of the N-phase bridge arm that has not failed to form a voltage adaptation charging module, and control the first switch of the N first switches that is connected to the third target coil to be disconnected, and control the first switch of the N first switches that is connected to the second target coil to be closed, and control the bridge arm of the N-phase bridge arm that has not failed to charge the battery, wherein the second target coil includes the coil of the N coils that is connected to the bridge arm that has not failed, and the third target coil includes the coil of the N coils that is connected to the bridge arm that has failed.

[0029] Optionally, the energy storage element further includes a first capacitor;

[0030] One end of the first capacitor is connected to the neutral point and the positive electrode of the external power supply device, and the other end is connected to the negative electrode of the battery and the negative electrode of the external power supply device.

[0031] Optionally, the controller is used to:

[0032] In a first preset state, controlling at least one phase bridge arm of the N-phase bridge arm so that the first capacitor and the battery are charged and discharged to achieve self-heating of the battery;

[0033] In the second preset state, at least one coil among the N coils and at least one phase bridge arm correspondingly connected to the at least one coil are reused to form a voltage adaptation charging module, and the at least one phase bridge arm is controlled to charge the battery.

[0034] Optionally, the device further comprises: N first switches connected to the N coils in a one-to-one correspondence, wherein one end of the first switch is connected to the neutral point;

[0035] The controller is further used to detect whether each phase bridge arm in the N phase bridge arms is faulty;

[0036] The controller is used to control, under the first preset state, the first switch among the N first switches that is connected to the third target coil to be disconnected, and the first switch among the N first switches that is connected to the second target coil to be closed, and the bridge arm among the N phase bridge arms that has not failed to charge and discharge the first capacitor and the battery to achieve self-heating of the battery, wherein the second target coil includes the coil among the N coils that is connected to the bridge arm that has not failed to fail, and the third target coil includes the coil among the N coils that is connected to the bridge arm that has failed to fail.

[0037] Optionally, the device further comprises:

[0038] N first switches connected to the N coils in a one-to-one correspondence, wherein one end of each first switch is connected to the neutral point;

[0039] A second switch, wherein one end of the second switch is connected to the neutral point, and the other end is used to be connected to the positive electrode of the external power supply device;

[0040] The energy storage element further includes a first capacitor, wherein one end of the first capacitor is respectively connected to the neutral point and the positive electrode of the external power supply device, and the other end is respectively connected to the negative electrode of the battery and the negative electrode of the external power supply device;

[0041] The controller is used to:

[0042] In a first preset state, in response to receiving a first control instruction for instructing inductive self-heating of the battery, a first switch among the N first switches and correspondingly connected to a first target coil is controlled to be closed, the second switch is controlled to be opened, and at least two phases of the N phase bridge arms are controlled to charge and discharge the first target coil with the battery, so as to realize self-heating of the battery, wherein the first target coil includes a coil among the N coils and connected to the at least two phases of the bridge arms;

[0043] In a first preset state, in response to receiving a second control instruction for instructing capacitive self-heating of the battery, the first switch among the N first switches and correspondingly connected to the second target coil is controlled to be closed, the second switch is controlled to be closed, and at least one phase bridge arm of the N phase bridge arms is controlled to charge and discharge the first capacitor and the battery to achieve self-heating of the battery, wherein the second target coil includes a coil among the N coils and connected to the at least one phase bridge arm.

[0044] In a second aspect, the present disclosure provides a vehicle, comprising:

[0045] Batteries; and

[0046] The battery energy processing device provided according to the first aspect of the present disclosure.

[0047] In the above technical solution, the battery energy processing device includes: an inverter, an energy storage element and a controller, wherein the inverter is connected to the battery and the energy storage element respectively, and the energy storage element is connected to the external power supply device; the controller is used to: in the first preset state, control the inverter to charge and discharge the energy storage element and the battery to realize battery self-heating. In this way, the energy storage element can be used to transfer the electricity in the battery back and forth between the battery and the energy storage element in the first preset state to realize battery charging and discharging, thereby realizing battery self-heating, so as to better maintain the battery temperature, improve the activity of the lithium-ion battery electrolyte and the electrochemical reaction rate, and ensure the driving ability of the electric vehicle drive system. In addition, the battery self-heating has small energy loss, uniform heat transfer, and high heating efficiency. In addition, in the second preset state, the above-mentioned battery energy processing device can also reuse the energy storage element and the inverter to form a voltage adaptation charging module, and control the inverter to charge the battery. That is, the battery charging and battery self-heating share a set of battery energy processing devices, thereby realizing the multi-functional reuse of the battery energy processing device, saving the cost of components and volume space.

[0048] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0050] Figure 1 The figure is a structural block diagram of a battery energy processing device according to an exemplary embodiment.

[0051] Figure 2 The diagram is a circuit topology diagram of a battery energy processing device according to an exemplary embodiment.

[0052] Figure 3 and Figure 4 The present invention is a schematic diagram showing a working principle of boost charging a battery in a first preset state according to an exemplary embodiment.

[0053] Figure 5 is a circuit topology diagram of a battery energy processing device according to another exemplary embodiment.

[0054] Figure 6 is a circuit topology diagram of a battery energy processing device according to another exemplary embodiment.

[0055] Figure 7 is a circuit topology diagram of a battery energy processing device according to another exemplary embodiment.

[0056] Figure 8-Figure 11 According to an exemplary embodiment, a method of using Figure 7 Schematic diagram of the working principle of the battery energy processing device heating the battery shown in FIG.

[0057] Fig.12 is a circuit topology diagram of a battery energy processing device according to another exemplary embodiment.

[0058] Fig.13 is a circuit topology diagram of a battery energy processing device according to another exemplary embodiment. DETAILED DESCRIPTION

[0059] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0060] It should be noted that all actions of acquiring signals, information or data in the present disclosure are carried out in compliance with the relevant data protection laws and policies of the country where the device is located and with the authorization given by the owner of the corresponding device.

[0061] Figure 1 FIG. 1 is a structural block diagram of a battery energy processing device according to an exemplary embodiment. Figure 1 As shown, the battery energy processing device 300 may include: an inverter 1 , an energy storage element 2 and a controller 3 .

[0062] Among them, the inverter 1 is used to connect to the battery 100 at one end and to connect to the energy storage element 2 at the other end; the energy storage element 2 is used to connect to the external power supply device 200; the controller 3 is connected to the inverter 1 and is used to: in a first preset state, control the inverter 1 to charge and discharge the energy storage element 2 and the battery 100 (for example, cyclic charging and discharging) to achieve self-heating of the battery 100; in a second preset state, reuse the energy storage element 2 and the inverter 1 to form a voltage adaptation charging module, and control the inverter 1 to charge the battery 100. Among them, the external power supply device 200 can be, for example, a charging pile, a battery, etc.

[0063] The above-mentioned cyclic charging and discharging refers to that charging and discharging are switched multiple times at a certain frequency. Through the cyclic charging and discharging of the battery, the battery can generate heat, thereby realizing self-heating of the battery.

[0064] In the present disclosure, the first preset state refers to a battery self-heating state, and the second preset state refers to a battery charging state.

[0065] In the above technical solution, the battery energy processing device includes: an inverter, an energy storage element and a controller, wherein the inverter is connected to the battery and the energy storage element respectively, and the energy storage element is connected to the external power supply device; the controller is used to: in the first preset state, control the inverter to charge and discharge the energy storage element and the battery to realize battery self-heating. In this way, the energy storage element can be used to transfer the electricity in the battery back and forth between the battery and the energy storage element in the first preset state to realize battery charging and discharging, thereby realizing battery self-heating, so as to better maintain the battery temperature, improve the activity of the lithium-ion battery electrolyte and the electrochemical reaction rate, and ensure the driving ability of the electric vehicle drive system. In addition, the battery self-heating has small energy loss, uniform heat transfer, and high heating efficiency. In addition, in the second preset state, the above-mentioned battery energy processing device can also reuse the energy storage element and the inverter to form a voltage adaptation charging module, and control the inverter to charge the battery. That is, the battery charging and battery self-heating share a set of battery energy processing devices, thereby realizing the multi-functional reuse of the battery energy processing device, saving the cost of components and volume space.

[0066] like Figure 2 As shown, the inverter 1 includes an N-phase bridge arm B, and the energy storage element 2 includes N coils KM, where N≥2. The first bus terminal of the N-phase bridge arm B is connected to the positive electrode of the battery 100, and the second bus terminal of the N-phase bridge arm B is respectively connected to the negative electrode of the battery 100 and the negative electrode of the external power supply device 200, the first ends of the N coils KM are connected to the midpoint of the N-phase bridge arm B in a one-to-one correspondence, and the second ends of the N coils KM are connected together to form a neutral point, which is used to connect to the positive electrode of the external power supply device 200.

[0067] At this time, the controller 3 is used to: in a first preset state, control at least two phase bridge arms of the N-phase bridge arm B, so that the coils connected to at least two phase bridge arms among the N coils KM are charged and discharged with the battery 100 to achieve self-heating of the battery 100; in a second preset state, reuse at least one coil among the N coils KM and at least one phase bridge arm correspondingly connected to at least one coil to form a voltage adaptation charging module, and control at least one phase bridge arm correspondingly connected to the above-mentioned at least one coil to charge the battery 100.

[0068] Preferably, the controller 3 is used to control the N-phase bridge arm B in a first preset state to charge and discharge the N coils KM and the battery 100 to achieve self-heating of the battery 100. In this way, the N-phase bridge arm and the N coils work simultaneously, which can maximize the heating power and thus improve the battery self-heating effect.

[0069] The controller 3 is used to reuse the N coils KM and the N-phase bridge arm B to form a voltage adaptation charging module in the second preset state, and control the N-phase bridge arm B to charge the battery 100. In this way, the N-phase bridge arm and the N coils work simultaneously, which can maximize the charging power, thereby improving the battery charging efficiency.

[0070] Although Figure 2 The diagram is illustrated by taking N=2 as an example, but those skilled in the art should understand that Figure 2 The number of bridge arms and the number of coils are only examples.

[0071] In the first preset state, use Figure 2 The specific process of the battery energy processing device 300 heating the battery 100 is as follows: N coils KM are used as current limiting buffer devices to control the conduction mode of the N-phase bridge arm B, and at the same time, the duty cycle of the conducted bridge arm is adjusted to control the battery loop current, so that the internal resistance of the battery is heated, thereby driving the temperature of the battery 100 to rise, thereby achieving controllable heating of the battery 100.

[0072] In the second preset state, at least one phase arm of the N-phase bridge arm B is controlled to charge the battery 100, wherein the battery 100 can be boosted charged or directly charged, and the charging method to be used can be determined based on the voltage of the battery 100 and the voltage of the external power supply device 200.

[0073] Specifically, the controller 3 is also used to detect whether the voltage of the external power supply device 200 is less than the voltage of the battery 100; at this time, the controller 3 can be used to: in the second preset state, in response to detecting that the voltage of the external power supply device 200 is less than the voltage of the battery 100, reuse at least one coil of the N coils KM and at least one phase bridge arm corresponding to the at least one coil to form a voltage adaptation charging module, and control the upper bridge arm of at least one phase bridge arm corresponding to the at least one coil to be disconnected, and the lower bridge arm of at least one phase bridge arm to be alternately turned on and off, so as to boost and charge the battery 100; in the second preset state, in response to detecting that the voltage of the external power supply device 200 is not less than the voltage of the battery 100, control the N-phase bridge arm B to be disconnected, so as to directly charge the battery 100. In this way, voltage adaptation charging can be automatically performed according to the size of the voltage of the external power supply device 200 and the voltage of the battery 100, so that both high-voltage external power supply devices and low-voltage external power supply devices can realize the charging of high-voltage batteries through the battery energy processing device 300 without the need for additional configuration of boosting devices.

[0074] Combine the following Figure 3 and Figure 4 The working principle of boost charging the battery 100 in the first preset state is described in detail.

[0075] exist Figure 3 In the embodiment, the controller 3 controls all upper bridge arms of the N-phase bridge arm B to be disconnected, and controls at least one phase lower bridge arm of the N-phase bridge arm B to be turned on. Then, the current flows out from the positive pole of the external power supply device 200, flows through the coil connected to the turned-on lower bridge arm among the N coils KM, the turned-on lower bridge arm of the N-phase bridge arm B, and then returns to the negative pole of the external power supply device 200. In this way, the coil connected to the turned-on lower bridge arm among the N coils KM can be charged. In addition, by controlling the number of lower bridge arms turned on and the on-duty ratio, the size of the charging current can be controlled, and then the size of the charging power can be controlled.

[0076] In one example, assume that the N-phase bridge arm B includes two bridge arms b1 and b2, and the N coils KM include two coils H1 and H2, wherein one end of the coil H1 is connected to the midpoint of the bridge arm b1, and one end of the coil H2 is connected to the midpoint of the bridge arm b2. Then, the controller 3 controls all the upper bridge arms of the bridge arms b1 and b2 to be disconnected, and controls all the lower bridge arms of the bridge arms b1 and b2 to be turned on, then the positive pole of the external power supply device 200, the N coils KM (i.e., coils H1 and H2), all the lower bridge arms of the N-phase bridge arm B (i.e., the lower bridge arms of the bridge arms b1 and b2), and the negative pole of the external power supply device 200 form a circuit for charging the N coils KM.

[0077] Then, in Figure 4In the embodiment, the controller 3 controls all lower bridge arms of the N-phase bridge arm B to be disconnected, and then the current flows out from the positive electrode of the external power supply device 200, flows through the N coils KM, the freewheeling diodes in all upper bridge arms of the N-phase bridge arm B, the positive electrode of the battery 100, the negative electrode of the battery 100 in sequence, and then returns to the negative electrode of the external power supply device 200. In this way, the energy of the external power supply device 200 and the N coils KM can be transferred to the battery 100, so that the N coils KM and the external power supply device 200 can charge the battery 100 at the same time, that is, the boost charging of the battery 100 is realized.

[0078] Still taking the above example as an example. Since in the above example, all the lower bridge arms of bridge arms b1 and b2 are turned on, all the lower bridge arms of N-phase bridge arm B (i.e., all the upper bridge arms of bridge arms b1 and b2) should be disconnected now, then the positive pole of the external power supply device 200, the N coils KM (i.e., coils H1 and H2), the freewheeling diodes in all the upper bridge arms of N-phase bridge arm B (i.e., the upper bridge arms of bridge arms b1 and b2), the battery 100, and the negative pole of the external power supply device 200 form a circuit that transfers the energy in the N coils KM and the energy received by the external power supply device to the battery 100, that is, the battery 100 is charged by the N coils KM and the external power supply device 200.

[0079] Therefore, by controlling the upper bridge arm of at least one phase bridge arm of the N-phase bridge arm B to be disconnected and the lower bridge arm of at least one phase bridge arm to be alternately turned on and off, Figure 3 and Figure 4 The state cycle works to complete the boost charging of battery 100.

[0080] Combine the following Figure 4 The working principle of directly charging the battery 100 in the first preset state is described in detail.

[0081] When the voltage of the external power supply device 200 is not less than the voltage of the battery 100, it is not necessary to boost the external power supply device. Figure 4 As shown, the controller 3 can control all lower bridge arms of the N-phase bridge arm B to be disconnected, and then the current flows out from the positive electrode of the external power supply device 200, flows through the N coils KM, the freewheeling diodes in all upper bridge arms of the N-phase bridge arm B, the positive electrode of the battery 100, the negative electrode of the battery 100, and then returns to the negative electrode of the external power supply device 200. In this way, the energy of the external power supply device 200 can be transferred to the battery 100, so that the external power supply device 200 charges the battery 100, that is, the direct charging of the battery 100 is realized.

[0082] In one embodiment, the N coils KM are motor windings (e.g., motor windings of a drive motor), and the N-phase bridge arm B is a bridge arm converter. That is, the existing motor windings and bridge arm converters on the vehicle are reused, so that different functions can be realized as needed. For example, when the battery needs to be self-heated or charged, the N coils KM and the N-phase bridge arm B can be applied to the various self-heating processes described in the present disclosure; when the vehicle needs to be driven, the N coils KM and the N-phase bridge arm B can be switched to control the bridge arm B to make the motor output power corresponding to the motor winding, thereby driving the vehicle. In this way, different functions can be realized as needed by reusing the vehicle motor windings and bridge arm converters, and the vehicle cost is also saved.

[0083] In addition, if Figure 5 As shown, the battery energy processing device 300 may further include a second capacitor C2, wherein one end of the second capacitor C2 is respectively connected to the positive electrode of the battery 100 and the first bus terminal of the N-phase bridge arm B, and the other end is respectively connected to the negative electrode of the battery 100 and the second bus terminal of the N-phase bridge arm B. The second capacitor C2 has a voltage stabilizing effect, thereby preventing the peak generated when the battery energy processing device 300 is turned on with the battery 100 or the external power supply device 200 from affecting the components in the energy processing device 300.

[0084] In addition, the battery energy processing device 300 may further include: a third switch K3 and a fourth switch K4 (not shown in the figure). The third switch K3 has one end connected to the neutral point and the other end connected to the positive electrode of the external power supply device 200; the fourth switch K4 has one end connected to the negative electrode of the battery 100 and the other end connected to the negative electrode of the external power supply device 200.

[0085] At this time, the controller 3 is used to: in a first preset state, control the third switch K3 and the fourth switch K4 to be disconnected, and control at least two phases of the N-phase bridge arm B, so that the coils connected to at least two phases of the N coils KM are charged and discharged with the battery 100 to achieve self-heating of the battery 100; in a second preset state, control the third switch K3 and the fourth switch K4 to be closed, and control at least one phase of the N-phase bridge arm B to charge the battery 100.

[0086] like Figure 6 As shown, the battery energy processing device 300 further includes: N first switches K1 connected to the N coils KM in a one-to-one correspondence, wherein one end of the first switch K1 is connected to the neutral point.

[0087] At this time, the controller 3 is used to: in a first preset state, control the first switch K1 among the N first switches K1, which is connected to the first target coil, to be closed, and control at least two phases of the N phase bridge arm B, so that the first target coil and the battery 100 are charged and discharged to realize self-heating of the battery 100, wherein the first target coil includes the coil among the N coils KM, which is connected to at least two phases; in a second preset state, reuse at least one coil among the N coils KM and at least one phase of the bridge arm connected to at least one coil to form a voltage adaptation charging module, and control the first switch K1 among the N first switches K1, which is connected to the at least one coil, to be closed, and control at least one phase of the bridge arm connected to the at least one coil, so as to charge the battery 100.

[0088] In addition, for Figure 6 The battery energy processing device 300 shown in the figure, the controller 3 can also be used to detect whether each phase bridge arm in the N-phase bridge arm B is faulty in the second preset state; at this time, the controller 3 is used to reuse the second target coil and the bridge arm in the N-phase bridge arm that has not failed to form a voltage adaptation charging module in the second preset state, and control the first switch K1 in the N first switches K1 that is connected to the third target coil to be disconnected, and control the first switch K1 in the N first switches K1 that is connected to the second target coil to be closed, and control the bridge arm in the N-phase bridge arm B that has not failed to charge the battery 100, wherein the second target coil includes the coil in the N coils KM that is connected to the bridge arm that has not failed, and the third target coil includes the coil in the N coils KM that is connected to the bridge arm that has failed. In this way, if a phase arm of the N-phase bridge arm B fails, the faulty bridge arm can be disconnected by the first switch K1 connected to it to close the channel of the phase bridge arm, and the battery can be charged by using the channel composed of other phase bridge arms with normal functions, thereby improving the redundant fault tolerance performance of the battery energy processing device 300.

[0089] like Figure 7 As shown, the energy storage element 2 further includes a first capacitor C1, wherein one end of the first capacitor C1 is respectively connected to the neutral point and the positive electrode of the external power supply device 200, and the other end is respectively connected to the negative electrode of the battery 100 and the negative electrode of the external power supply device 200.

[0090] At this time, the controller 3 is used to: in a first preset state, control at least one phase bridge arm of the N-phase bridge arm B to charge and discharge the first capacitor C1 and the battery 100 to achieve self-heating of the battery 100; in a second preset state, reuse at least one coil among the N coils KM and at least one phase bridge arm correspondingly connected to the at least one coil to form a voltage adaptation charging module, and control at least one phase bridge arm correspondingly connected to the at least one coil to charge the battery 100.

[0091] Combine the following Figures 8 to 11 Detailed description of using in the first preset state Figure 7 The process of heating the battery 100 by the N-phase bridge arm B, the N coils KM, and the first capacitor C1.

[0092] First, if Figure 8 As shown, in the first process, the controller 3 can control all lower bridge arms of the N-phase bridge arm B to be disconnected, and control at least one upper bridge arm of the N-phase bridge arm B to be turned on. At this time, the current flows out from the positive electrode of the battery 100, flows through the turned-on upper bridge arm, the coil connected to the turned-on upper bridge arm and the first capacitor C1, and finally returns to the negative electrode of the battery 100. In this process, the battery 100 is in an outward discharge state, and the first capacitor C1 receives the energy of the coil connected to the turned-on upper bridge arm, and the voltage continues to increase, realizing energy storage.

[0093] Next, if Fig. 9 As shown, in the second process, the controller 3 can control all upper bridge arms of the N-phase bridge arm B to be disconnected, and control the lower bridge arm in the lower bridge arm of the N-phase bridge arm B, which is connected to the coil with the freewheeling current, to be turned on. At this time, the current flows out of the coil with the freewheeling current, flows through the first capacitor C1 and the turned-on lower bridge arm, and finally returns to the coil with the freewheeling current. In this process, due to the freewheeling effect of the coil, the first capacitor C1 continues to receive energy from the coil, and the voltage continues to increase.

[0094] like Fig.10 As shown, in the third process, as the voltage across the first capacitor C1 continues to increase, the first capacitor C1 will automatically convert the energy of the receiving coil KM into releasing energy to the coil KM. At this time, the current flows out of the first capacitor C1, flows through the coil connected to the conductive lower bridge arm, the conductive lower bridge arm, and finally returns to the first capacitor C1. In this process, the voltage across the first capacitor C1 continues to decrease.

[0095] Afterwards, if Fig.11 As shown, in the fourth process, the controller 3 can control all lower bridge arms of the N-phase bridge arm B to be disconnected, and control at least one upper bridge arm of the N-phase bridge arm B to be turned on. At this time, the current flows out of the first capacitor C1, flows through the coil connected to the turned-on upper bridge arm, the turned-on upper bridge arm, the positive electrode of the battery 100 and the negative electrode of the battery 100, and finally returns to the first capacitor C1. In this process, the battery 100 is in a charging state.

[0096] As the voltage across the first capacitor C1 continues to decrease, the first capacitor C1 and the coil connected to the turned-on upper bridge arm switch from releasing energy to the battery 100 to receiving energy from the battery 100. At this time, the current flow direction returns to the flow direction described in the first process, and the battery 100 begins to discharge outward.

[0097] The above four processes are continuously cycled, so that the first capacitor C1 and the battery 100 can be rapidly charged / discharged in a cyclic manner. Due to the existence of the internal resistance of the battery, a large amount of heat is generated, which causes the battery to heat up rapidly, thereby improving the heating efficiency of the battery.

[0098] like Fig.12 As shown, the above-mentioned device also includes: N first switches K1 connected to the N coils KM in a one-to-one correspondence, wherein one end of the first switch K1 is connected to the neutral point, and at this time, the above-mentioned controller 3 can also be used to detect whether each phase bridge arm in the N-phase bridge arm B is faulty; at this time, the controller 3 can be used to control the first switch K1 connected to the third target coil among the N first switches K1 to be disconnected, and control the first switch K1 connected to the second target coil among the N first switches K1 to be closed, and control the bridge arm in the N-phase bridge arm B that has not failed, so that the first capacitor C1 and the battery 100 are charged and discharged to realize self-heating of the battery 100, wherein the second target coil includes the coil connected to the bridge arm that has not failed among the N coils KM, and the third target coil includes the coil connected to the bridge arm that has failed among the N coils KM.

[0099] In this way, if a phase arm of the N-phase bridge arm B fails, the faulty bridge arm can be disconnected by the first switch K1 connected to it to close the channel of the phase bridge arm, and the channel composed of other phase bridge arms with normal functions can be used to complete battery self-heating, thereby improving the redundant fault tolerance performance of the battery energy processing device 300.

[0100] like Fig.13 As shown, the battery energy processing device 300 may further include: N first switches K1 connected one-to-one with the N coils (KM), wherein one end of the first switch K1 is connected to the neutral point; a second switch K2, wherein one end of the second switch K2 is connected to the neutral point, and the other end is used to connect to the positive electrode of the external power supply device 200; the energy storage element 2 also includes a first capacitor C1, wherein one end of the first capacitor C1 is respectively connected to the neutral point and the positive electrode of the external power supply device 200, and the other end is respectively connected to the negative electrode of the battery 100 and the negative electrode of the external power supply device 200.

[0101] At this time, the controller 3 is used to: in a first preset state, in response to receiving a first control instruction for instructing inductive self-heating of the battery 100, control the first switch K1 among the N first switches K1, which is connected to the first target coil, to close, control the second switch K2 to open, and control at least two bridge arms of the N-phase bridge arm B, so that the first target coil and the battery 100 are charged and discharged to achieve self-heating of the battery 100, wherein the first target coil includes the coils among the N coils KM, which are connected to at least two bridge arms; in the first preset state, in response to receiving a second control instruction for instructing capacitive self-heating of the battery 100, control the first switch K1 among the N first switches K1, which is connected to the second target coil, to close, control the second switch K2 to close, and control at least one bridge arm of the N-phase bridge arm B, so that the first capacitor C1 and the battery 100 are charged and discharged to achieve self-heating of the battery 100, wherein the second target coil includes the coils among the N coils KM, which are connected to at least one bridge arm.

[0102] In this way, battery heating includes two modes, namely inductive self-heating mode and capacitive self-heating mode. In this way, users can choose the appropriate battery heating mode according to their own needs, thereby improving user experience.

[0103] Although Figure 3-Figure 13 In the figure, N=2 is used as an example for illustration, but those skilled in the art should understand that the number of bridge arms and the number of coils in the above figures are only examples.

[0104] The present disclosure also provides a battery energy processing method, the method comprising:

[0105] In a first preset state, controlling the inverter to charge and discharge the energy storage element and the battery to achieve self-heating of the battery;

[0106] In the second preset state, the energy storage element and the inverter are reused to form a voltage adaptation charging module, and the inverter is controlled to charge the battery.

[0107] Among them, the inverter has one end connected to the battery and the other end connected to the energy storage element;

[0108] Energy storage element, used to connect to external power supply equipment.

[0109] Through the above technical solution, in the first preset state, the energy storage element can be used to transfer the electricity in the battery back and forth between the battery and the energy storage element to realize battery charging and discharging, thereby realizing battery self-heating, so as to better maintain the battery temperature, improve the activity of the lithium-ion battery electrolyte and the electrochemical reaction rate, and ensure the driving ability of the electric vehicle drive system. In addition, the battery self-heating has low energy loss, uniform heat transfer, and high heating efficiency. In addition, in the second preset state, the above-mentioned battery energy processing device can also reuse the energy storage element and the inverter to form a voltage adaptation charging module, and control the inverter to charge the battery. That is, battery charging and battery self-heating share a set of battery energy processing devices, thereby realizing the multi-functional reuse of the battery energy processing device, saving component costs and volume space.

[0110] Optionally, the inverter includes N-phase bridge arms, and the energy storage element includes N coils, where N≥2;

[0111] The first bus terminal of the N-phase bridge arm is connected to the positive electrode of the battery, the second bus terminal of the N-phase bridge arm is connected to the negative electrode of the battery and the negative electrode of the external power supply device respectively, the first ends of the N coils are connected to the midpoint of the N-phase bridge arm one by one, and the second ends of the N coils are connected together to form a neutral point, which is used to connect to the positive electrode of the external power supply device;

[0112] Control the inverter to charge and discharge the energy storage elements and batteries, including:

[0113] Controlling at least two phase bridge arms of the N phase bridge arms so that the coils connected to at least two phase bridge arms among the N coils are charged and discharged with the battery;

[0114] The energy storage element and the inverter are reused to form a voltage adaptation charging module, and the inverter is controlled to charge the battery, including:

[0115] At least one coil among the N coils and at least one phase bridge arm correspondingly connected to the at least one coil are reused to form a voltage adaptation charging module, and at least one phase bridge arm correspondingly connected to the at least one coil is controlled to charge the battery.

[0116] Optionally, the above method further includes:

[0117] Detect whether the voltage of the external power supply device is lower than the voltage of the battery;

[0118] At least one coil among the N coils and at least one phase bridge arm correspondingly connected to the at least one coil are reused to form a voltage adaptation charging module, and at least one phase bridge arm correspondingly connected to the at least one coil is controlled to charge the battery, including:

[0119] In response to detecting that the voltage of the external power supply device is lower than the voltage of the battery, at least one coil among the N coils and at least one phase bridge arm correspondingly connected to the at least one coil are reused to form a voltage adaptation charging module, and the upper bridge arm of the at least one phase bridge arm correspondingly connected to the at least one coil is controlled to be disconnected, and the lower bridge arm of the at least one phase bridge arm is alternately turned on and off to boost charging the battery.

[0120] Optionally, at least one coil among the N coils and at least one phase bridge arm correspondingly connected to the at least one coil are reused to form a voltage adaptation charging module, and at least one phase bridge arm correspondingly connected to the at least one coil is controlled to charge the battery, further comprising:

[0121] In response to detecting that the voltage of the external power supply device is not less than the voltage of the battery, the N-phase bridge arm is controlled to be disconnected to directly charge the battery.

[0122] Optionally, the N coils are connected to N first switches in a one-to-one correspondence, wherein one end of the first switch is connected to the neutral point;

[0123] Controlling at least two phase bridge arms of the N phase bridge arms so that the coils connected to the at least two phase bridge arms among the N coils are charged and discharged with the battery, comprising:

[0124] Controlling the first switch among the N first switches that is connected to the first target coil to close, and controlling at least two bridge arms of the N-phase bridge arms to charge and discharge the first target coil with the battery, wherein the first target coil includes the coil among the N coils that is connected to at least two bridge arms;

[0125] At least one coil among the N coils and at least one phase bridge arm correspondingly connected to the at least one coil are reused to form a voltage adaptation charging module, and at least one phase bridge arm correspondingly connected to the at least one coil is controlled to charge the battery, including:

[0126] At least one coil among the N coils and at least one phase bridge arm correspondingly connected to the at least one coil are reused to form a voltage adaptation charging module, and the first switch among the N first switches correspondingly connected to the at least one coil is controlled to be closed, and the at least one phase bridge arm correspondingly connected to the at least one coil is controlled to charge the battery.

[0127] Optionally, the N coils are connected to N first switches in a one-to-one correspondence, wherein one end of the first switch is connected to the neutral point;

[0128] The above method further includes:

[0129] In a second preset state, detecting whether each phase bridge arm in the N phase bridge arms is faulty;

[0130] At least one coil among the N coils and at least one phase bridge arm correspondingly connected to the at least one coil are reused to form a voltage adaptation charging module, and at least one phase bridge arm correspondingly connected to the at least one coil is controlled to charge the battery, including:

[0131] The second target coil and the bridge arm in the N-phase bridge arm that has not failed are reused to form a voltage adaptation charging module, and the first switch in the N first switches that is connected to the third target coil is controlled to be disconnected, and the first switch in the N first switches that is connected to the second target coil is controlled to be closed, and the bridge arm in the N-phase bridge arm that has not failed is controlled to charge the battery, wherein the second target coil includes the coil in the N coils that is connected to the bridge arm that has not failed, and the third target coil includes the coil in the N coils that is connected to the bridge arm that has failed.

[0132] Optionally, the energy storage element further includes a first capacitor, wherein one end of the first capacitor is respectively connected to the neutral point and the positive electrode of the external power supply device, and the other end is respectively connected to the negative electrode of the battery and the negative electrode of the external power supply device;

[0133] Control the inverter to charge and discharge the energy storage elements and batteries, including:

[0134] Controlling at least one phase bridge arm of the N phase bridge arms to charge and discharge the first capacitor and the battery;

[0135] The energy storage element and the inverter are reused to form a voltage adaptation charging module, and the inverter is controlled to charge the battery, including:

[0136] At least one coil among the N coils and at least one phase bridge arm correspondingly connected to the at least one coil are reused to form a voltage adaptation charging module, and the at least one phase bridge arm correspondingly connected to the at least one coil is controlled to charge the battery.

[0137] Optionally, the N coils are connected to N first switches in a one-to-one correspondence, wherein one end of the first switch is connected to the neutral point;

[0138] The energy storage element further includes a first capacitor, wherein one end of the first capacitor is respectively connected to the neutral point and the positive electrode of the external power supply device, and the other end is respectively connected to the negative electrode of the battery and the negative electrode of the external power supply device;

[0139] The above method further includes:

[0140] Detect whether each phase bridge arm in the N-phase bridge arm is faulty;

[0141] Control the inverter to charge and discharge the energy storage elements and batteries, including:

[0142] The first switch among the N first switches connected to the third target coil is controlled to be disconnected, and the first switch among the N first switches connected to the second target coil is controlled to be closed, and the bridge arm without fault among the N phase bridge arms is controlled to charge and discharge the first capacitor and the battery to achieve battery self-heating, wherein the second target coil includes the coil among the N coils connected to the bridge arm without fault, and the third target coil includes the coil among the N coils connected to the bridge arm with fault.

[0143] Optionally, the N coils are connected to N first switches in a one-to-one correspondence, wherein one end of the first switch is connected to the neutral point;

[0144] The energy storage element further includes a first capacitor, wherein one end of the first capacitor is respectively connected to the neutral point and the positive electrode of the external power supply device, and the other end is respectively connected to the negative electrode of the battery and the negative electrode of the external power supply device;

[0145] Control the inverter to charge and discharge the energy storage elements and batteries, including:

[0146] In response to receiving a first control instruction for instructing inductive self-heating of the battery, a first switch among the N first switches corresponding to the first target coil is controlled to be closed, a second switch is controlled to be opened, and at least two bridge arms of the N phase bridge arms are controlled to charge and discharge the first target coil with the battery, wherein the first target coil includes a coil among the N coils connected to at least two bridge arms, and a second switch, one end of which is connected to the neutral point, and the other end of which is used to be connected to the positive electrode of an external power supply device;

[0147] In response to receiving a second control instruction for instructing capacitive self-heating of the battery, a first switch among the N first switches that is connected to the second target coil is controlled to be closed, the second switch is controlled to be closed, and at least one phase bridge arm of the N phase bridge arms is controlled to charge and discharge the first capacitor and the battery, wherein the second target coil includes a coil among the N coils that is connected to at least one phase bridge arm.

[0148] The specific implementation method of each step in the battery energy processing method according to the embodiment of the present disclosure has been described in detail in the battery energy processing device according to the embodiment of the present disclosure, and will not be repeated here.

[0149] In addition, the present disclosure also provides a vehicle, including a battery and the above-mentioned battery energy processing device provided by the present disclosure.

[0150] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0151] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0152] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A battery energy processing device, characterized in that: include: An inverter (1), an energy storage element (2), a controller (3), N first switches (K1) and a second switch (K2); The inverter (1) comprises N-phase bridge arms (B), the energy storage element (2) comprises N coils (KM) and a first capacitor (C1), and N≥2; The first busbar end of the N-phase bridge arm (B) is connected to the positive electrode of the battery (100), the second busbar end of the N-phase bridge arm (B) is respectively connected to the negative electrode of the battery (100) and the negative electrode of the external power supply device (200), the first ends of the N coils (KM) are connected to the midpoint of the N-phase bridge arm (B) in a one-to-one correspondence, the second ends of the N coils (KM) are connected together to form a neutral point, and the neutral point is used to be connected to the positive electrode of the external power supply device (200); The N coils (KM) are connected to the N first switches (K1) in a one-to-one correspondence, wherein one end of the first switch (K1) is connected to the neutral point; The second switch (K2) has one end connected to the neutral point and the other end connected to the positive electrode of the external power supply device (200); The first capacitor (C1) has one end connected to the neutral point and the positive electrode of the external power supply device (200) respectively, and the other end connected to the negative electrode of the battery (100) and the negative electrode of the external power supply device (200) respectively; The controller (3) is connected to the inverter (1) and is used to: In a first preset state, in response to receiving a first control instruction for instructing inductive self-heating of the battery (100), the first switch (K1) among the N first switches (K1) and connected to the first target coil is controlled to be closed, the second switch (K2) is controlled to be opened, and at least two phases of the N phase bridge arms (B) are controlled to charge and discharge the first target coil and the battery (100) so as to achieve self-heating of the battery (100), wherein the first target coil includes the coil among the N coils (KM) and connected to the at least two phases of the bridge arms; In a first preset state, in response to receiving a second control instruction for instructing capacitive self-heating of the battery (100), the first switch (K1) among the N first switches (K1) and connected to the second target coil is controlled to be closed, the second switch (K2) is controlled to be closed, and at least one phase bridge arm of the N phase bridge arms (B) is controlled to charge and discharge the first capacitor (C1) and the battery (100) to achieve self-heating of the battery (100), wherein the second target coil includes the coil among the N coils (KM) and connected to the at least one phase bridge arm; In a second preset state, the energy storage element (2) and the inverter (1) are reused to form a voltage adaptation charging module, and the inverter (1) is controlled to charge the battery (100).

2. The device according to claim 1, characterized in that The controller (3) is used to: In a second preset state, at least one coil among the N coils (KM) and at least one phase bridge arm correspondingly connected to the at least one coil are reused to form a voltage adaptation charging module, and the first switch (K1) among the N first switches (K1) correspondingly connected to the at least one coil is controlled to be closed, and the at least one phase bridge arm is controlled to charge the battery (100).

3. The device according to claim 2, characterized in that The controller (3) is further used to detect whether the voltage of the external power supply device (200) is lower than the voltage of the battery (100); The controller (3) is used to: In a second preset state, in response to detecting that the voltage of the external power supply device (200) is lower than the voltage of the battery (100), at least one of the N coils (KM) and at least one phase bridge arm correspondingly connected to the at least one coil are reused to form a voltage adaptation charging module, and the first switch (K1) correspondingly connected to the at least one coil among the N first switches (K1) is controlled to be closed, and the upper bridge arm of the at least one phase bridge arm is controlled to be disconnected, and the lower bridge arm of the at least one phase bridge arm is controlled to be alternately turned on and off, so as to boost and charge the battery (100).

4. The device according to claim 3, characterized in that The controller (3) is further used for: In a second preset state, in response to detecting that the voltage of the external power supply device (200) is not less than the voltage of the battery (100), the N-phase bridge arm (B) is controlled to be disconnected, and the first switch (K1) among the N first switches (K1) corresponding to the at least one coil is controlled to be closed, so as to directly charge the battery (100).

5. The device according to claim 1, characterized in that The controller (3) is further used to detect whether each phase bridge arm in the N-phase bridge arm (B) is faulty in a second preset state; The controller (3) is used to, in the second preset state, reuse the second target coil and the bridge arm of the N-phase bridge arm (B) that has not failed to form a voltage adaptation charging module, and control the first switch (K1) of the N first switches (K1) that is connected to the third target coil to be disconnected, and control the first switch (K1) of the N first switches (K1) that is connected to the second target coil to be closed, and control the bridge arm of the N-phase bridge arm (B) that has not failed to charge the battery (100), wherein the second target coil includes the coil of the N coils (KM) that is connected to the bridge arm that has not failed, and the third target coil includes the coil of the N coils (KM) that is connected to the bridge arm that has failed.

6. The device according to claim 1, characterized in that The controller (3) is further used to detect whether each phase bridge arm in the N-phase bridge arm (B) is faulty; The controller (3) is used for, in the first preset state, in response to receiving a second control instruction for instructing the battery (100) to perform capacitive self-heating, controlling the first switch (K1) among the N first switches (K1) that is connected to the third target coil to be disconnected, controlling the first switch (K1) among the N first switches (K1) that is connected to the second target coil to be closed, controlling the second switch (K2) to be closed, and controlling the bridge arm among the N phase bridge arm (B) that has not failed, so that the first capacitor (C1) and the battery (100) are charged and discharged to achieve self-heating of the battery (100), wherein the second target coil includes the coil among the N coils (KM) that is connected to the bridge arm that has not failed, and the third target coil includes the coil among the N coils (KM) that is connected to the bridge arm that has failed.

7. A vehicle, characterized in that: include: Battery; as well as A battery energy processing device according to any one of claims 1 to 6.

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