Battery pack heating circuit and energy storage cabinet

Abstract

The utility model relates to a battery pack heating circuit and an energy storage cabinet, the circuit comprises at least one energy storage module, and the energy storage module comprises an AC-DC conversion circuit, a driving element and a controller; the DC side of the AC-DC conversion circuit is suitable for being connected with the battery pack, and the AC side is suitable for being connected with an external power supply; the controller is connected with the driving element, the first confluence end of the controller is suitable for connecting the anode of the battery pack, and the second confluence end is suitable for connecting the cathode of the battery pack; when the temperature of the battery pack is lower than the preset temperature, the inductor in the controller and the driving element is suitable for forming a current loop with the battery pack lower than the preset temperature so as to perform self-heating of the battery pack; or the external power supply is suitable for charging the battery pack with the temperature lower than the preset temperature or discharging the battery pack with the temperature lower than the preset temperature to the external power supply so as to perform self-heating of the battery pack. According to the scheme, the internal self-heating function of the battery pack can be realized without arranging an additional external device, the heating is uniform, the heating speed is high, and additional cost and volume are not increased.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more particularly to a battery pack heating circuit and an energy storage cabinet. Background Art

[0002] With the development of economy and technology, renewable energy has been widely used in various fields. However, due to the instability and intermittency of renewable energy, the application of renewable energy in industry and commerce is limited. The development of energy storage technology can solve the shortcomings of renewable energy, that is, it can store energy when there is excess energy and output energy when needed. The battery of electric vehicles can be used for energy storage. However, the performance of the battery is easily affected by temperature, especially in low temperature environment, the performance of the battery will decline significantly.

[0003] In the related art, the battery is generally heated by external heating, wherein the external heating can be divided into external heating by gas or external heating by external devices such as liquid, material, heating wire, etc. However, the heating process by external heating by gas is slow and the heating is uneven; the external heating by external devices such as liquid, material, heating wire, etc. is complex in structure, high in cost and low in safety. Utility Model Content

[0004] A series of simplified concepts are introduced in the utility model content section, which will be further described in detail in the detailed implementation section. The utility model content section of this application does not mean to attempt to define the key features and essential technical features of the technical solution claimed for protection, nor does it mean to attempt to determine the scope of protection of the technical solution claimed for protection.

[0005] In response to the existing problems, the present application provides a battery pack heating circuit on one hand, comprising at least one energy storage module, wherein the energy storage module comprises an AC / DC conversion circuit, a driving element and a controller, wherein the driving element comprises an inductor, and each of the energy storage modules is suitable for connecting to a battery pack; the DC side of the AC / DC conversion circuit in the energy storage module is suitable for connecting to the battery pack, and the AC side of the AC / DC conversion circuit is suitable for connecting to an external power supply; the controller in the energy storage module is connected to the driving element, wherein the first bus terminal of the controller is suitable for connecting to the positive electrode of the battery pack, and the second bus terminal of the controller is suitable for connecting to the negative electrode of the battery pack; when the temperature of at least one of the battery packs is lower than a preset temperature: the inductor of the controller and the driving element are suitable for forming a current loop with the battery pack lower than the preset temperature to perform self-heating of the battery pack; or, the external power supply is suitable for charging the battery pack lower than the preset temperature through the AC / DC conversion circuit, or the battery pack lower than the preset temperature is suitable for discharging the external power supply through the AC / DC conversion circuit to perform self-heating of the battery pack.

[0006] Exemplarily, the controller includes a plurality of bridge arm components connected in parallel between the first bus terminal and the second bus terminal, each of the bridge arm components includes a first bridge group and a second bridge group connected in series, the first end of the first bridge group is connected to the first bus terminal, the second end of the second bridge group is connected to the second bus terminal, and the second end of the first bridge group and the first end of the second bridge group in each of the bridge arm components are connected in series and connected to an inductor of the driving element.

[0007] Exemplarily, when the temperature of at least one of the battery packs is lower than the preset temperature, the controller controls the first bridge group in at least one of the bridge arm components to be turned on and the second bridge group to be turned off, and controls the first bridge group in at least one of the remaining bridge arm components to be turned off and the second bridge group to be turned on, so that the battery pack below the preset temperature is discharged and forms a current loop with the turned-on first bridge group, the turned-on second bridge group and the inductance of the driving element to perform self-heating of the battery pack.

[0008] Exemplarily, different battery packs are connected in parallel.

[0009] Exemplarily, the first bridge group and the second bridge group each include an insulated gate bipolar transistor.

[0010] Exemplarily, the driving element is a driving motor, the inductance of the driving element is a winding of the driving motor, and the controller is a motor controller.

[0011] Exemplarily, the AC-DC conversion circuit includes a power factor correction circuit and a DC-DC conversion circuit.

[0012] Exemplarily, the energy storage module further includes a capacitor, which is connected in parallel between a first bus terminal and a second bus terminal of the controller.

[0013] On the other hand, the present application provides an energy storage cabinet, which includes the above-mentioned battery pack heating circuit.

[0014] Exemplarily, the energy storage cabinet further includes an AC charging and discharging interface, and the AC-DC conversion circuit of the energy storage cabinet is connected to an external power supply via the AC charging and discharging interface.

[0015] The battery pack heating circuit and energy storage cabinet of the present application can realize the internal self-heating function of the battery pack without the need for additional external devices, and the heating is uniform and fast without adding additional cost and volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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.

[0017] In the attached figure:

[0018] Figure 1 A circuit structure schematic diagram of a battery pack heating circuit according to a specific embodiment of the present application is shown.

[0019] Figure 2 A schematic diagram of the flow of current when a current loop is formed by a controller, an inductor in a driving element, and a battery pack in a specific embodiment of the present application is shown.

[0020] Figure 3 A schematic diagram showing the flow of current when an external power source in a specific embodiment of the present application charges a battery pack through an AC-DC conversion circuit.

[0021] Figure 4 A schematic diagram showing the flow of current when a battery pack according to a specific embodiment of the present application discharges an external power source through an AC-DC conversion circuit. 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] Refer to the following Figures 1 to 4 An exemplary description is given of a battery pack heating circuit according to a specific embodiment of the present application, wherein: Figure 1 A circuit structure diagram of a battery pack heating circuit according to a specific embodiment of the present application is shown. Figure 2 A schematic diagram showing the flow of current when a current loop is formed by a controller, an inductor in a driving element, and a battery pack in a specific embodiment of the present application is shown. Figure 3 A schematic diagram showing the flow of current when an external power source in a specific embodiment of the present application charges a battery pack through an AC-DC conversion circuit is shown. Figure 4 A schematic diagram showing the flow of current when a battery pack according to a specific embodiment of the present application discharges an external power source through an AC-DC conversion circuit.

[0024] like Figure 1 As shown, the battery pack heating circuit of the present application includes at least one energy storage module, the energy storage module includes an AC-DC conversion circuit, a driving element and a controller, the driving element includes an inductor, and each energy storage module is suitable for connecting to a battery pack, wherein: the DC side of the AC-DC conversion circuit in the energy storage module is suitable for connecting to the battery pack, and the AC side of the AC-DC conversion circuit is suitable for connecting to an external power supply; the controller in the energy storage module is connected to the driving element, the first bus terminal of the controller is suitable for connecting to the positive electrode of the battery pack, and the second bus terminal of the controller is suitable for connecting to the negative electrode of the battery pack.

[0025] Among them, when the temperature of at least one battery pack is lower than the preset temperature: Figure 2 As shown, the inductor in the controller and the power element is suitable for forming a current loop with the battery pack below the preset temperature to perform self-heating of the battery pack. At this time, the battery pack discharges externally. Specifically, the current flows out from the positive electrode of the battery pack and flows to the negative electrode of the battery pack after flowing through the controller and the inductor in the power element to form a complete current loop; or Figure 3 and Figure 4 As shown, the external power supply charges the battery pack below the preset temperature through the AC-DC conversion circuit or the battery pack below the preset temperature discharges the external power supply through the AC-DC conversion circuit to perform self-heating of the battery pack, wherein the process of the external power supply charging the battery pack below the preset temperature and the battery pack below the preset temperature discharging the external power supply can be performed alternately. It is worth noting that when the temperature of at least one battery pack is lower than the preset temperature, each battery pack with a temperature lower than the preset temperature respectively forms a current loop with the controller and the inductance of the driving element in the energy storage module connected to the battery pack. Exemplarily, when there are multiple battery packs with temperatures lower than the preset temperature at the same time, multiple battery packs with temperatures lower than the preset temperature can simultaneously or successively perform the above-mentioned battery pack self-heating process, and the present application does not limit this. Exemplarily, the preset temperature should be reasonably set according to actual needs, and the present application does not limit this. Exemplarily, the temperature of the battery pack can be monitored by corresponding equipment, and when the temperature of the battery pack rises to the required temperature, the heating process can be stopped, wherein the required temperature can be equal to or greater than the preset temperature.

[0026] Specifically, when the temperature of at least one battery pack is lower than a preset temperature, the inductance of the controller and the driving element is suitable for forming a current loop with the battery pack whose temperature is lower than the preset temperature. At this time, the battery pack is discharged to the outside. During the discharge of the battery pack, the current passes through the battery pack and generates heat on the internal resistance of the battery pack, thereby realizing the internal self-heating of the battery pack; or, the battery pack can be charged by an external power supply through an AC-DC conversion circuit or the battery pack can be discharged to the external power supply through an AC-DC conversion circuit. During the charging or discharging process, the current will pass through the battery pack and generate heat on the internal resistance of the battery pack, thereby realizing the internal self-heating of the battery pack. Exemplarily, the battery pack can be discharged or charged in a certain order to realize the internal self-heating of the battery pack. Specifically, the inductance of the controller and the driving element forms a current loop with the battery pack whose temperature is lower than the preset temperature to realize the self-heating of the battery pack, the external power supply charges the battery pack through the AC-DC conversion circuit to realize the self-heating of the battery pack, and the battery pack discharges the external power supply through the AC-DC conversion circuit to realize the self-heating of the battery pack.

[0027] Therefore, the battery pack heating circuit of the present application can form a current loop between the inductance of the battery pack, the controller and the driving element for a battery pack below a preset temperature, or use an external power source to charge the battery pack through an AC-DC conversion circuit or allow the battery pack to discharge the external power source through an AC-DC conversion circuit. During the discharge process of the battery pack or the charging process of the battery pack, the current passes through the battery pack and generates heat on the internal resistance of the battery pack, thereby realizing internal self-heating of the battery pack. Moreover, the present application does not require the provision of additional external devices to realize internal self-heating of the battery pack, and the heating is uniform and fast, without adding additional cost and volume.

[0028] In the embodiments of the present application, the battery pack may include a cell group, and the number of cells in different cell groups may be the same or different, and there is no limitation on this.

[0029] In the embodiments of the present application, Figure 1 The battery pack heating circuit shown includes two energy storage modules. In other embodiments, the battery pack heating circuit may also include three, four or more energy storage modules, which is not limited in the present application.

[0030] In the embodiments of the present application, Figure 1As shown, the controller includes a plurality of bridge arm components connected in parallel between the first bus terminal and the second bus terminal of the controller, each bridge arm component includes a first bridge group 110 and a second bridge group 120 connected in series, the first end of the first bridge group 110 is connected to the first bus terminal of the controller, the second end of the second bridge group 120 is connected to the second bus terminal of the controller, and the second end of the first bridge group 110 and the first end of the second bridge group 120 in each bridge arm component are connected in series and connected to an inductor of the driving element. Exemplarily, the first end of the first bridge group 110 and the second bridge group 120 is an end where the drain is located, and the second end of the first bridge group 110 and the second bridge group 120 is an end where the source is located.

[0031] In the embodiments of the present application, Figure 1 The driving element shown includes three inductors, and the controller includes three bridge arm components.

[0032] In the embodiment of the present application, the first bridge group 110 and the second bridge group 120 each include a switch tube and a diode, wherein the diode is connected in parallel between the drain and the source of the switch tube.

[0033] Furthermore, the first bridge group 110 and the second bridge group 120 both include power electronic devices such as IGBT (Insulated Gate Bipolar Transistor), MOSFET (Metal Oxide Semiconductor Field Effect Transistor), HEMT (High Electron Mobility Transistor), etc. The material of the power electronic devices can be Si, SiC, GaN, etc., without limitation.

[0034] In an embodiment of the present application, the driving element is a driving motor, the inductance of the driving element is the winding of the driving motor, and the controller is a motor controller. Taking the driving motor as a three-phase motor as an example, the inductance of the driving element is respectively the three phase lines (windings) of the three-phase motor, and the motor controller includes three bridge arm components. Exemplarily, the power of the driving motor is relatively large. When the driving element is a driving motor, a high-power self-heating function of the battery pack can be realized. Among them, the driving motor and the motor controller can adopt the driving motor and the motor controller on the scrap electric vehicle, so as to minimize the cost while making full use of the scrap parts. Exemplarily, the three phase lines in the three-phase motor can adopt the same-phase control method, or the phase-shifted carrier frequency modulation can be used to realize the staggered control to reduce the current ripple. Exemplarily, the driving electrode can remove the rotor, but the heating situation needs to be evaluated, and the temperature of the parts related to the rotor should be lower than 150 degrees Celsius. Exemplarily, the driving element can also be a compressor, the inductance of the driving element can also be the winding of the compressor, and the controller can also be a compressor controller. At this time, due to the power limitation of the compressor, low-power self-heating of the battery pack can be achieved. Among them, the compressor and compressor controller can adopt the compressor and compressor controller on used electric vehicles, thereby making full use of waste parts while minimizing costs.

[0035] In the embodiments of the present application, Figure 2 As shown, when the temperature of at least one battery pack is lower than a preset temperature, the controller controls the first bridge group 110 in at least one bridge arm component to be turned on and the second bridge group 120 to be turned off, and controls the first bridge group 110 in at least one remaining bridge arm component to be turned off and the second bridge group 120 to be turned on, so that the battery pack below the preset temperature is discharged and forms a current loop with the turned-on first bridge group, the turned-on second bridge group and the inductance of the driving element to perform self-heating of the battery pack.

[0036] by Figure 2 As an example, the driving element shown includes three inductors and the controller includes three bridge arm components. The controller can control the first bridge group 110 of one of the bridge arm components to be turned on and the second bridge group 120 to be turned off, and control the second bridge group 120 of another bridge arm component to be turned on and the first bridge group 110 to be turned off, so that the battery pack discharges externally. Figure 2As shown, at this time, the current flows out from the positive electrode of the battery pack, flows to the inductance of the driving element connected to the first bridge group 110 through the conductive first bridge group 110, and continues to flow to the conductive second bridge group 120 through the inductance of the driving element connected to the conductive second bridge group 120, and finally returns to the negative electrode of the battery pack, and flows to the positive electrode of the battery pack inside the battery pack to form a complete current loop. In this process, since the current passes through the inside of the battery pack, heat can be generated on the internal resistance inside the battery pack to achieve internal self-heating of the battery pack. Exemplarily, during the discharge process of the battery pack, the first bridge group 110 and the second bridge group 120 in the remaining bridge arm components of the controller that do not participate in the current flow are both kept disconnected.

[0037] In other embodiments, taking the example that the driving element includes three inductors and the controller includes three bridge arm components, when the battery pack is discharged below a preset temperature, the controller can control the first bridge group 110 of two of the bridge arm components to be turned on and the second bridge group 120 to be disconnected, and control the first bridge group 110 of the remaining bridge arm component to be disconnected and the second bridge group 120 to be turned on. At this time, the current flows out from the positive electrode of the battery pack, flows through the two turned-on first bridge groups 110 to the inductors of the driving element connected to the turned-on first bridge groups 110 to complete the convergence, and continues to flow to the turned-on second bridge group 120 through the inductors of the driving element connected to the turned-on second bridge group 120, and finally returns to the negative electrode of the battery pack, and flows inside the battery pack to the positive electrode of the battery pack to form a complete current loop.

[0038] In other embodiments, taking the example that the driving element includes three inductors and the controller includes three bridge arm components, when the battery pack is discharged below a preset temperature, the controller can control the first bridge group 110 of one of the bridge arm components to be turned on and the second bridge group 120 to be disconnected, and control the first bridge groups 110 of the remaining two bridge arm components to be disconnected. At this time, the current flows out from the positive electrode of the battery pack, flows through the two turned-on first bridge groups 110 to the inductor of the driving element connected to the turned-on first bridge group 110, and continues to flow to the turned-on second bridge groups 120 through the inductors of the driving elements connected to the two turned-on second bridge groups 120 respectively, and completes the convergence back to the negative electrode of the battery pack after flowing through the turned-on second bridge groups 120, and flows inside the battery pack to the positive electrode of the battery pack to form a complete current loop.

[0039] In the embodiments of the present application, Figure 3As shown, when the temperature of at least one battery pack is lower than a preset temperature, the external power source charges the battery pack below the preset temperature through an AC-DC conversion circuit to achieve self-heating of the battery pack. In the process of charging the battery pack, inside the battery pack, the current flows from the positive electrode of the battery pack to the negative electrode of the battery pack. At this time, due to the existence of the internal resistance of the battery pack, the current will generate heat on the internal resistance of the battery, thereby achieving internal self-heating of the battery pack. Exemplarily, the external power source discharges the battery pack below the preset temperature through the AC-DC conversion circuit in the energy storage module connected to the battery pack below the preset temperature.

[0040] In the embodiments of the present application, Figure 4 As shown, when the temperature of at least one battery pack is lower than a preset temperature, the battery pack whose temperature is lower than the preset temperature discharges to an external power source through an AC-DC conversion circuit to achieve self-heating of the battery pack. In the process of the battery pack discharging to the external power source, inside the battery pack, the current flows from the negative electrode of the battery pack to the positive electrode of the battery pack. At this time, due to the existence of the internal resistance of the battery pack, the current will generate heat on the internal resistance of the battery, thereby achieving internal self-heating of the battery pack. Exemplarily, the battery pack at a preset temperature discharges to an external power source through an AC-DC conversion circuit in an energy storage module connected to the battery pack whose temperature is lower than the preset temperature.

[0041] Exemplarily, the AC-DC conversion circuit includes a power factor correction (PFC) circuit and a DC-DC conversion circuit, wherein the input end of the PFC circuit is connected to the AC side of the AC-DC conversion circuit, the output end of the PFC circuit is connected to the input end of the DC-DC conversion circuit, and the output end of the DC-DC conversion circuit is connected to the DC side of the AC-DC conversion circuit. Wherein, the PFC circuit may include a plurality of bridge arm components, each of which may include two switch tubes connected in series, such as IGBT or MOSFET, etc., and the AC power of the external power supply is converted into DC power and output to the DC-DC conversion circuit by controlling the on and off of the switch tubes on the bridge arm components; the DC-DC conversion circuit includes a primary circuit and a secondary circuit coupled by a transformer, and the primary circuit and the secondary circuit both include a plurality of bridge arm components, and each bridge arm component may include two switch tubes connected in series, such as IGBT or MOSFET, etc., the primary circuit of the DC-DC conversion circuit converts DC power into AC power and inputs it to the secondary circuit through the coupling of the transformer, and the secondary circuit converts AC power into DC power again, and after passing through the DC-DC conversion circuit, the voltage of the DC power is converted into a suitable voltage and input into the battery pack to charge the battery pack. Exemplarily, the input end of the PFC circuit is connected to the external power supply through three live wires and one ground wire. Exemplarily, the external power supply includes a power grid.

[0042] In the embodiments of the present application, Figure 1 As shown, different battery packs are connected in parallel. Specifically, the positive electrodes of different battery packs are connected to each other, and the negative electrodes are connected to each other, and different energy storage modules can be electrically connected to each other through the parallel battery packs.

[0043] In the embodiments of the present application, Figure 1 As shown, the energy storage module in the battery pack heating circuit also includes a capacitor C, wherein the capacitor C is connected in parallel between the first bus terminal and the second bus terminal of the controller. Exemplarily, the branch where the capacitor C is located can realize functions such as decoupling, filtering and energy storage.

[0044] This completes the introduction to the structure of the battery pack heating circuit of the present application. A complete battery pack heating circuit may also include other components, which will not be described one by one here.

[0045] In summary, the battery pack heating circuit of the present application can form a current loop between the inductance of the battery pack, the controller and the driving element for a battery pack below a preset temperature, or use an external power supply to charge the battery pack through an AC-DC conversion circuit or allow the battery pack to discharge the external power supply through an AC-DC conversion circuit. During the discharge process of the battery pack or the charging process of the battery pack, the current passes through the battery pack and generates heat on the internal resistance of the battery pack, thereby realizing internal self-heating of the battery pack. Moreover, the present application does not require the provision of additional external devices to realize internal self-heating of the battery pack, and the heating is uniform and fast, without adding additional cost and volume.

[0046] An embodiment of the present application also provides an energy storage cabinet, which includes the above-mentioned battery pack heating circuit.

[0047] In an embodiment of the present application, the energy storage cabinet further includes an AC charging and discharging interface, and the AC-DC conversion circuit is connected to an external power source via the AC-DC charging and discharging interface. Exemplarily, the external power source includes a power grid. Exemplarily, the energy storage cabinet may also include other components, which are not limited in the embodiment of the present application.

[0048] 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.

[0049] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0050] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed.

[0051] 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.

[0052] Similarly, it should be understood that in order to streamline the present application and help understand one or more of the various application 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.

[0053] 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.

[0054] 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.

[0055] It should be noted that the above embodiments illustrate the present application rather than limit the present application, and that those skilled in the art may design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets should not be constructed as a limitation to the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "one" or "an" preceding an element does not exclude the presence of multiple such elements. The present application may be implemented by means of hardware including several different elements and by means of a suitably programmed computer. In a unit claim that lists several devices, several of these devices may be embodied by the same hardware item. The use of the words first, second, and third, etc. does not indicate any order. These words may be interpreted as names.

[0056] The above is only a specific implementation method or description of a specific implementation method 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 battery pack heating circuit, characterized in that: It includes at least one energy storage module, which includes an AC / DC conversion circuit, a driving element and a controller, wherein the driving element includes an inductor, and each of the energy storage modules is suitable for connecting to a battery pack; The DC side of the AC-DC conversion circuit in the energy storage module is suitable for connecting to the battery pack, and the AC side of the AC-DC conversion circuit is suitable for connecting to an external power source; The controller in the energy storage module is connected to the driving element, the first bus terminal of the controller is suitable for connecting to the positive electrode of the battery pack, and the second bus terminal of the controller is suitable for connecting to the negative electrode of the battery pack; When the temperature of at least one of the battery packs is lower than a preset temperature: the controller and the inductor in the driving element are suitable for forming a current loop with the battery pack below the preset temperature to achieve self-heating of the battery pack; or, the external power supply is suitable for charging the battery pack below the preset temperature through the AC / DC conversion circuit, or the battery pack below the preset temperature is suitable for discharging the external power supply through the AC / DC conversion circuit to achieve self-heating of the battery pack.

2. The battery pack heating circuit according to claim 1, characterized in that: The controller includes a plurality of bridge arm components connected in parallel between the first bus terminal and the second bus terminal, each of the bridge arm components includes a first bridge group and a second bridge group connected in series, the first end of the first bridge group is connected to the first bus terminal, the second end of the second bridge group is connected to the second bus terminal, and the second end of the first bridge group and the first end of the second bridge group in each of the bridge arm components are connected in series and connected to an inductor of the driving element.

3. The battery pack heating circuit according to claim 2, characterized in that: When the temperature of at least one of the battery packs is lower than the preset temperature, the controller controls the first bridge group in at least one of the bridge arm components to be turned on and the second bridge group to be turned off, and controls the first bridge group in at least one of the remaining bridge arm components to be turned off and the second bridge group to be turned on, so that the battery pack below the preset temperature is discharged and forms a current loop with the turned-on first bridge group, the turned-on second bridge group and the inductance of the driving element to perform self-heating of the battery pack.

4. The battery pack heating circuit according to claim 1, characterized in that: Different battery packs are connected in parallel.

5. The battery pack heating circuit according to claim 2, characterized in that: The first bridge group and the second bridge group each include an insulated gate bipolar transistor.

6. The battery pack heating circuit according to claim 1, characterized in that: The driving element is a driving motor, the inductance of the driving element is a winding of the driving motor, and the controller is a motor controller.

7. The battery pack heating circuit according to claim 1, characterized in that: The AC-DC conversion circuit includes a power factor correction circuit and a DC-DC conversion circuit.

8. The battery pack heating circuit according to claim 1, characterized in that: The energy storage module further includes a capacitor connected in parallel between the first bus terminal and the second bus terminal of the controller.

9. An energy storage cabinet, characterized in that: The energy storage cabinet includes the battery pack heating circuit described in any one of claims 1-8.

10. The energy storage cabinet according to claim 9, characterized in that: The energy storage cabinet further comprises an AC charging and discharging interface, and the AC-DC conversion circuit of the energy storage cabinet is suitable for being connected to an external power source through the AC charging and discharging interface.

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