Heating device, power supply system and electric equipment

Abstract

The utility model relates to a heating device, a power supply system and electric equipment, and the heating device comprises a battery module which comprises a battery pack; the first end of the driving circuit is electrically connected with the battery module; the second end of the driving circuit is connected with the first pole of the battery pack or the second pole of the battery pack in a switchable manner through the switch module, so that the battery module and the driving circuit form a first heating loop; or enabling the battery module and the driving circuit to form a second heating loop; wherein the first heating loop and the second heating loop are used for self-heating of the battery pack. According to the heating device, self-heating can be achieved through the battery module and the driving circuit, an external heating device is not needed, and the heating cost can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of battery equipment, and in particular to a heating device, a power supply system and an electrical device. Background Art

[0002] At present, with the development of new energy technology, electric vehicles have become more popular. However, when the battery is in a low temperature environment, its charge and discharge performance will drop significantly due to the decrease in the activity of the positive and negative electrode materials and the electrolyte. Therefore, when the battery temperature is too low, the battery must be heated to increase its body temperature to ensure normal use of the battery under cold conditions.

[0003] In the related art, the method of heating the battery in a low temperature environment is generally external heating, which is to heat the battery by adding additional heating equipment. This heating method is costly. Utility Model Content

[0004] The present application is proposed to solve the above-mentioned problems. According to one aspect of the present application, a heating device is provided, which includes: a battery module, the battery module includes a battery pack; a drive circuit, a first end of the drive circuit is electrically connected to the battery module; a switch module, a second end of the drive circuit is switchably connected to the first pole of the battery pack or the second pole of the battery pack through the switch module, so that the battery module and the drive circuit form a first heating circuit; or, the battery module and the drive circuit form a second heating circuit; wherein the first heating circuit and the second heating circuit are used for self-heating of the battery pack.

[0005] Exemplarily, the battery module also includes a control circuit, the drive circuit includes at least one inductor, and the control circuit includes at least one bridge arm; two switching tubes are provided on the bridge arm, and the two ends of the bridge arm are respectively connected to the first pole and the second pole of the battery pack; the first end of the inductor is connected to the midpoint of the bridge arm, and the second end of the inductor is switchably connected to the first pole or the second pole of the battery pack through the switch module.

[0006] Exemplarily, the switch module includes a first switch and a second switch, the second end of the inductor can be connected to the first pole of the battery pack through the first switch, and the second end of the inductor can be connected to the second pole of the battery pack through the second switch.

[0007] Exemplarily, the control circuit includes a first bridge arm consisting of a first switch tube and a second switch tube, a second bridge arm consisting of a third switch tube and a fourth switch tube, and a third bridge arm consisting of a fifth switch tube and a sixth switch tube; the first bridge arm, the second bridge arm and the second ends of the third bridge arm are respectively connected to a first bus terminal and a second bus terminal, the first bus terminal is connected to a first pole of the battery pack, and the second bus terminal is connected to a second pole of the battery pack.

[0008] Exemplarily, the driving circuit includes a first inductor, a second inductor and a third inductor, the first end of the first inductor is connected to the midpoint of the first bridge arm, the first end of the second inductor is connected to the midpoint of the second bridge arm, and the first end of the third inductor is connected to the midpoint of the third bridge arm; the second ends of the first inductor, the second inductor and the third inductor are connected to a third bus terminal, and the third bus terminal is switchably connected to the first pole or the second pole of the battery pack through the switch module.

[0009] Exemplarily, the control circuit is configured as follows: at least one of the second switch tube, the fourth switch tube and the sixth switch tube is closed, and the first switch tube, the third switch tube and the fifth switch tube are opened; one end of the switch module is connected to the third bus terminal, and the other end is connected to the first pole of the battery pack; so that the battery module, the switch module and the drive circuit form the first heating circuit.

[0010] Exemplarily, the control circuit is configured as follows: at least one of the first switch tube, the third switch tube and the fifth switch tube is closed, and the second switch tube, the fourth switch tube and the sixth switch tube are opened; one end of the switch module is connected to the third bus terminal, and the other end is connected to the second pole of the battery pack; so that the battery module, the switch module and the drive circuit form the second heating circuit.

[0011] Exemplarily, the device further includes a controller, and the controller is used to control the configuration of the switch module and the control circuit.

[0012] Exemplarily, the first electrode of the battery pack is a positive electrode, and the second electrode of the battery pack is a negative electrode.

[0013] Exemplarily, the control circuit further includes a capacitor connected between the first bus terminal and the second bus terminal.

[0014] According to another aspect of the present application, a power supply system is provided, wherein the power supply system includes the above-mentioned heating device.

[0015] According to another aspect of the present application, an electrical device is provided, wherein the electrical device includes the above-mentioned power supply system.

[0016] The heating device in the present application connects the battery module and the drive circuit together through a switch module. The drive circuit can switchably connect the first pole or the second pole of the battery pack through the switch module to form a first heating circuit or a second heating circuit. After the heating circuit is formed, heat can be generated by passing current, thereby realizing self-heating of the battery pack. The heating device in the present application can realize self-heating through the battery module and the drive circuit, without the need for an external heating device, which can reduce the heating cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] By describing the embodiments of the present application in more detail in conjunction with the accompanying drawings, the above and other purposes, features and advantages of the present application will become more apparent. The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the accompanying drawings, the same reference numerals generally represent the same components or steps.

[0018] Figure 1 It is a structural block diagram of a heating device provided by an embodiment of the utility model.

[0019] Figure 2 It is a circuit diagram of a heating device provided by an embodiment of the utility model.

[0020] Figure 3 It is a schematic diagram of a first heating circuit provided by an embodiment of the utility model.

[0021] Figure 4 It is a schematic diagram of a second heating circuit provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the present application more obvious, the example embodiments according to the present application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application, and it should be understood that the present application is not limited to the example embodiments described herein. Based on the embodiments of the present application described in the present application, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of the present application.

[0023] like Figure 1 As shown, an embodiment of the present application provides a heating device applied to a battery pack, wherein the heating device includes: a battery module, a drive circuit and a switch module.

[0024] The battery module includes a battery pack, and the first end of the drive circuit is electrically connected to the battery module. The second end of the drive circuit is switchably connected to the first pole of the battery pack or the second pole of the battery pack through the switch module, so that the battery module and the drive circuit form a first heating circuit; or, the battery module and the drive circuit form a second heating circuit. The first heating circuit and the second heating circuit are used for self-heating of the battery pack.

[0025] The heating device in the present application connects the battery module and the drive circuit together through a switch module. The drive circuit can switchably connect the first pole or the second pole of the battery pack through the switch module to form a first heating circuit or a second heating circuit. After the heating circuit is formed, heat can be generated by passing current, thereby realizing self-heating of the battery pack. The heating device in the present application can realize self-heating through the battery module and the drive circuit without the aid of an external heating device, which can reduce the heating cost of the battery pack.

[0026] Exemplarily, the driving circuit includes at least one inductor, the battery module also includes a control circuit, the control circuit includes at least one bridge arm, two switch tubes are arranged on the bridge arm, and the two ends of the bridge arm are respectively connected to the first pole and the second pole of the battery pack; one end of the inductor is connected to the midpoint of the bridge arm, and the second end of the inductor is switchably connected to the first pole or the second pole of the battery module through the switch module. The switch tube on the control circuit can control the on and off of the circuit, and when the switch tube is turned on, the branch where it is located can form a corresponding loop.

[0027] Exemplarily, the control circuit further includes two bus bars, which are respectively connected to the two ends of the bridge arm and serve as bus terminals for connecting to the first pole and the second pole of the battery pack.

[0028] like Figure 2 As shown, it is a circuit diagram of the heating device in the embodiment of the present application. The switch module 2 includes a first switch 21 and a second switch 22. The second end of the inductor in the drive circuit 4 can be connected to the first pole of the battery pack 1 through the first switch 21, and the second end of the inductor can be connected to the second pole of the battery pack 1 through the second switch 22. Exemplarily, the first pole of the battery pack 1 is the positive pole, and the second pole of the battery pack 1 is the negative pole. In the embodiment of the present application, the first switch 21 and the second switch 22 will not be in a closed state at the same time to avoid a short circuit in the battery pack 1.

[0029] Exemplarily, the control circuit 3 includes a first bridge arm composed of a first switch tube 31 and a second switch tube 32, a second bridge arm composed of a third switch tube 33 and a fourth switch tube 34, and a third bridge arm composed of a fifth switch tube 35 and a sixth switch tube 36. Both ends of the first bridge arm, the second bridge arm, and the third bridge arm are respectively connected to a first bus terminal and a second bus terminal, the first bus terminal is connected to a first pole of the battery pack 1, and the second bus terminal is connected to a second pole of the battery pack 1.

[0030] The driving circuit 4 includes a first inductor 41, a second inductor 42 and a third inductor 43. The first end of the first inductor 41 is connected to the midpoint of the first bridge arm, the first end of the second inductor 42 is connected to the midpoint of the second bridge arm, and the first end of the third inductor 43 is connected to the midpoint of the third bridge arm. The second ends of the first inductor 41, the second inductor 42 and the third inductor 43 are connected to the third bus terminal, and the third bus terminal is switchably connected to the first pole or the second pole of the battery pack 1 through the switch module 2. Exemplarily, the third bus terminal is connected to the positive pole of the battery pack 1 through the first switch 21, or the third bus terminal is connected to the negative pole of the battery pack 1 through the second switch 22.

[0031] In the figure, the part of the bridge arm where the first switch tube 31, the third switch tube 33 and the fifth switch tube 35 are located is the upper bridge arm, and the upper bridge arm is connected to the positive electrode of the battery pack 1. The part of the bridge arm where the second switch tube 32, the fourth switch tube 34 and the sixth switch tube 36 are located is the lower bridge arm, and the lower bridge arm is connected to the negative electrode of the battery pack 1. Therefore, according to the different on-off states of the upper bridge arm and the lower bridge arm in the control circuit 3, the inductor connected thereto will also be connected to different poles of the battery pack 1. Exemplarily, the types of the first switch 21, the second switch 22, and the first switch tube 31 to the sixth switch tube 36 include but are not limited to insulated gate bipolar transistors (IGBT).

[0032] like Figure 3 As shown, the arrow in the figure indicates the direction of current. When the battery is discharging, the switch module 2 and the control circuit 3 are configured as follows: the first switch 21 is closed and the second switch 22 is opened, at least one of the second switch tube 32, the fourth switch tube 34 and the sixth switch tube 36 is closed, the first switch tube 31, the third switch tube 33 and the fifth switch tube 35 are opened, and the switch module 2 is connected to the third bus terminal and the first pole of the battery pack 1. Figure 3 The arrow in the figure indicates the direction of current flow. Because the upper bridge arm in the control circuit 3 is disconnected (the first switch tube 31, the third switch tube 33 and the fifth switch tube 35 are disconnected), the current will flow into the inductor through the first switch 21. The first inductor 41, the second inductor 42 and the third inductor 43 correspond to the three bridge arms on the control circuit 3. When one of the second switch tube 32, the fourth switch tube 34 and the sixth switch tube 36 is closed, the current flows into the negative electrode of the battery pack 1 through the corresponding inductor and switch tube, thereby forming a first heating circuit. Because of the flow of current, heat will be generated in the battery pack due to the internal resistance of the battery, thereby achieving a self-heating effect.

[0033] like Figure 4As shown, when the first heating loop is disconnected, the switch module 2 and the control circuit 3 can be configured as follows: at least one of the first switch tube 31, the third switch tube 33 and the fifth switch tube 35 is closed, the second switch tube 32, the fourth switch tube 34 and the sixth switch tube 36 are disconnected, and the switch module 2 connects the third bus terminal and the second pole of the battery pack 1. The battery pack 1, the switch module 2, the control circuit 3 and the drive circuit 4 form a second heating loop.

[0034] When the first switch 21 is disconnected, the first heating circuit is disconnected, and the energy stored in the first to third inductors 41 to 43 can be released from the second heating circuit. Because the lower bridge arm (the second switch tube 32, the fourth switch tube 34, and the sixth switch tube 36) in the control circuit 3 is disconnected, the current can flow into the positive electrode of the battery pack 1 through the upper bridge arm, and then flow back into the inductor through the negative electrode of the battery pack 1 and the second switch 22, thereby forming a second heating circuit. In this process, heat is generated due to the passage of current, thereby realizing the self-heating function of the battery pack.

[0035] Exemplarily, the multiple switch tubes (the first switch tube 31, the third switch tube 33, and the fifth switch tube 35) of the upper bridge arm can act simultaneously or staggered. As long as one of them is turned on, a second heating loop can be formed when the second switch 22 is turned on. If the multiple switch tubes in the upper bridge arm are turned on at the same time, the energy accumulated by the first inductor 41 to the third inductor 43 can flow into the battery through the upper bridge arm for charging. Similarly, the multiple switch tubes (the second switch tube 32, the fourth switch tube 34, and the sixth switch tube 36) of the lower bridge arm can act simultaneously or staggered. As long as one of them is turned on, a first heating loop can be formed when the first switch 21 is turned on.

[0036] The first inductor 41 to the third inductor 43 need to be excited when the first heating circuit is turned on before they can be discharged when the second heating circuit is turned on. Figure 3 and Figure 4 The two states are cyclically alternating. During the process of battery self-heating, the first switch 21 and the second switch 22 are cyclically and alternately turned on, and similarly, the lower bridge arm and the upper bridge arm of the control circuit 3 are also cyclically and alternately turned on to continuously perform battery self-heating.

[0037] Exemplarily, the DCOBC in the figure represents a bidirectional on-board charger in an electric vehicle, and a battery pack can be charged by the bidirectional on-board charger.

[0038] For example, the control circuit 3 in the embodiment of the present application can be an internal circuit of the battery pack. The battery pack can be heated by multiplexing the control circuit 3 in conjunction with the drive circuit 4 and the switch module, without the need for external heating devices. In addition, in the present application, when the corresponding switch tubes on the upper bridge arm or the lower bridge arm are all turned on, the circulation of multiple currents in the control circuit 3 can be achieved, and the battery pack can be heated more effectively.

[0039] like Figure 3 Figure 4 As shown, the control circuit 3 also includes a capacitor connected between the first bus terminal and the second bus terminal. The capacitor can provide protection for the control circuit 3 to avoid circuit damage due to instantaneous voltage changes.

[0040] Exemplarily, the heating device also includes a controller, which is used to control the configuration of the switch module 2 and the control circuit 3. Exemplarily, the controller can be a battery sampling and execution unit (BASU), which is part of the battery management system (BMS) and can collect information such as the temperature, voltage, and current in the circuit of the battery. When the battery temperature is too low, the first switch 21 and the second switch 22 can be controlled to be turned on in a cycle, so that the first heating circuit and the second heating circuit are alternately turned on to achieve self-heating of the battery. When the first heating circuit is turned on, the battery pack 1 will discharge, and the second heating circuit can charge the battery pack 1 when it is turned on. Therefore, the charging and discharging process of the battery pack 1 will be cyclic, and the impact will be smaller than that of the scheme that only heats during the discharge process or the charging process.

[0041] The heating device in the present application connects the battery pack 1, the control circuit 3 and the drive circuit 4 together through the switch module 2. The first pole and the second pole of the battery pack 1 are connected through the switch module 2 to form different heating circuits. After the heating circuit is formed, there will be current to generate heat, so as to realize self-heating of the battery pack. There is no need to use an external heating device to increase the temperature of the battery pack, which is more convenient to use. In addition, the first heating circuit and the second heating circuit can be turned on alternately, and both can perform self-heating of the battery pack. Compared with the solution of heating only during the discharge process or the charging process, it is more efficient and less affected.

[0042] The embodiments of the present application describe exemplary connection modes of the control circuit 3 and the drive circuit 4. In some embodiments, the battery module only includes the battery pack 1, and the control circuit 3, the drive circuit 4, and the switch module 2 are all connected to the outside of the battery module. In some embodiments, the control circuit 3 and the drive circuit 4 are both arranged inside the battery pack 1.

[0043] The embodiment of the present application also provides a power supply system and an electric device, the power supply system includes the above-mentioned heating device, and the electric device includes the above-mentioned power supply system. Exemplarily, the electric device can be an electric vehicle or an energy storage device for battery recycling, etc. The power supply system is used to supply power to the electric device. The heating device mentioned above includes a battery pack and can be used for self-heating of the battery pack. The heating device is also part of the power supply system, which is used to provide the required power to the electric vehicle, energy storage device, etc.

[0044] The power supply system and electrical equipment in the present application adopt the above-mentioned heating device, and the battery pack 1, the control circuit 3 and the drive circuit 4 are connected together through the switch module 2. The first pole and the second pole of the battery pack 1 are connected through the switch module 2 to form different heating circuits. After the heating circuit is formed, there will be current to generate heat, so as to realize the self-heating of the battery pack. There is no need to use an external heating device to increase the temperature of the battery pack. It is more convenient to use and can effectively reduce the heating cost of the battery pack. In addition, the first heating circuit and the second heating circuit can be turned on alternately, and both can perform self-heating of the battery pack. Compared with the scheme of heating only during the discharge process or the charging process, it is more efficient and less affected.

[0045] Although example embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above example embodiments are merely exemplary and are not intended to limit the scope of the present application to this. Those of ordinary skill in the art may make various changes and modifications therein without departing from the scope and spirit of the present application. All these changes and modifications are intended to be included within the scope of the present application as required by the appended claims.

[0046] In the description provided herein, a large number of specific details are described. However, it is understood that the embodiments of the present application can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0047] Similarly, it should be understood that in order to streamline the present application and help understand one or more of the various inventive aspects, in the description of the exemplary embodiments of the present application, the various features of the present application are sometimes grouped together into a single embodiment, figure, or description thereof. However, the method of the present application should not be interpreted as reflecting the following intention: the claimed application requires more features than the features clearly stated in each claim. More specifically, as reflected in the corresponding claims, the inventive point is that the corresponding technical problem can be solved with features less than all the features of a single disclosed embodiment. Therefore, the claims following the specific embodiment are hereby explicitly incorporated into the specific embodiment, wherein each claim itself serves as a separate embodiment of the present application.

[0048] It will be understood by those skilled in the art that, except for mutually exclusive features, all features disclosed in this specification (including the accompanying claims, abstracts and drawings) and all processes or units of any method or device disclosed in this specification may be combined in any combination. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstracts and drawings) may be replaced by an alternative feature that provides the same, equivalent or similar purpose.

[0049] In addition, those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0050] The above is only a specific implementation or description of a specific implementation of the present application, and the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. The protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A heating device, characterized in that: The heating device comprises: A battery module, wherein the battery module comprises a battery pack; a drive circuit, a first end of the drive circuit being electrically connected to the battery module; and A switch module, wherein the second end of the drive circuit is switchably connected to the first pole of the battery pack or the second pole of the battery pack through the switch module, so that the battery module and the drive circuit form a first heating loop; or, the battery module and the drive circuit form a second heating loop; The first heating circuit and the second heating circuit are used for self-heating of the battery pack.

2. The heating device according to claim 1, characterized in that The battery module also includes a control circuit, the drive circuit includes at least one inductor, and the control circuit includes at least one bridge arm; two switching tubes are provided on the bridge arm, and the two ends of the bridge arm are respectively connected to the first pole and the second pole of the battery pack; the first end of the inductor is connected to the midpoint of the bridge arm, and the second end of the inductor is switchably connected to the first pole or the second pole of the battery pack through the switch module.

3. The heating device according to claim 2, characterized in that: The switch module includes a first switch and a second switch. The second end of the inductor can be connected to the first pole of the battery pack through the first switch, and the second end of the inductor can be connected to the second pole of the battery pack through the second switch.

4. The heating device according to claim 2, characterized in that: The control circuit includes a first bridge arm composed of a first switch tube and a second switch tube, a second bridge arm composed of a third switch tube and a fourth switch tube, and a third bridge arm composed of a fifth switch tube and a sixth switch tube; the first bridge arm, the second bridge arm and the two ends of the third bridge arm are respectively connected to a first bus terminal and a second bus terminal, the first bus terminal is connected to a first pole of the battery pack, and the second bus terminal is connected to a second pole of the battery pack.

5. The heating device according to claim 4, characterized in that: The driving circuit comprises a first inductor, a second inductor and a third inductor, wherein a first end of the first inductor is connected to a midpoint of the first bridge arm, a first end of the second inductor is connected to a midpoint of the second bridge arm, and a first end of the third inductor is connected to a midpoint of the third bridge arm; The second ends of the first inductor, the second inductor and the third inductor are connected to a third bus terminal, and the third bus terminal is switchably connected to the first pole or the second pole of the battery pack through the switch module.

6. The heating device according to claim 5, characterized in that: The control circuit is configured as follows: at least one of the second switch tube, the fourth switch tube and the sixth switch tube is closed, and the first switch tube, the third switch tube and the fifth switch tube are opened; one end of the switch module is connected to the third bus terminal, and the other end is connected to the first pole of the battery pack; The battery module, the switch module and the drive circuit form the first heating loop.

7. The heating device according to claim 5, characterized in that: The control circuit is configured as follows: at least one of the first switch tube, the third switch tube and the fifth switch tube is closed, and the second switch tube, the fourth switch tube and the sixth switch tube are opened; one end of the switch module is connected to the third bus terminal, and the other end is connected to the second pole of the battery pack; The battery module, the switch module and the drive circuit form the second heating loop.

8. The heating device according to any one of claims 2 to 7, characterized in that: The device also includes a controller, which is used to control the configuration of the switch module and the control circuit.

9. The heating device according to any one of claims 1 to 7, characterized in that: The first electrode of the battery pack is a positive electrode, and the second electrode of the battery pack is a negative electrode.

10. The heating device according to any one of claims 4 to 7, characterized in that: The control circuit further includes a capacitor connected between the first bus terminal and the second bus terminal.

11. A power supply system, characterized in that: The power supply system comprises the heating device according to any one of claims 1-10.

12. An electrical device, characterized in that: The electrical equipment includes the power supply system according to claim 11.

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