Heating device and battery pack

Abstract

The utility model provides a heating device and a battery pack, and relates to the technical field of batteries. The heating device is used for the battery pack and comprises a battery management module, an oscillation module and a frequency control module, and the battery management module is used for detecting working condition information of a battery pack in the battery pack; two ends of the oscillation module are respectively connected with a positive electrode and a negative electrode of the battery pack to enable the battery pack to oscillate and charge; the frequency control module is electrically connected with the oscillation module and the battery management module so as to control the frequency of oscillation charging and discharging according to the working condition information. The heating device provided by the utility model can adjust different frequencies to carry out oscillation charging and discharging on the battery pack according to different states of the battery pack, so that the battery pack is heated, electric energy consumed by heating of the heating device is reduced, the frequency is prevented from being too high, and the safety of heating the battery pack is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a heating device and a battery pack. Background Technology

[0002] In low-temperature environments, the internal resistance of the battery pack increases significantly, affecting the performance of the battery pack. Therefore, a heating device is needed to heat the battery pack to keep its temperature within a suitable range.

[0003] In the prior art, an oscillation circuit connected to the battery pack is set up to enable the battery pack to charge and discharge at a high frequency, thereby achieving self-heating of the battery pack.

[0004] However, simply setting up an oscillation circuit to heat the battery pack makes it impossible to control the charging and discharging frequency of the battery pack. When the charging and discharging frequency is too high, the energy consumption is large and there are certain safety hazards. Utility Model Content

[0005] This application provides a heating device and a battery pack, which can control the charging and discharging frequency of the battery pack according to the operating condition information of the battery pack, which helps to save energy consumption and improve the safety of the battery pack.

[0006] In a first aspect, this application provides a heating device for a battery pack, comprising: a battery management module for detecting the operating condition information of the battery pack; an oscillation module, the two ends of which are respectively connected to the positive and negative terminals of the battery pack to cause the battery pack to oscillate for charging and discharging; and a frequency control module, which is electrically connected to both the oscillation module and the battery management module to control the frequency of oscillation for charging and discharging according to the operating condition information.

[0007] In one possible implementation, the oscillation module includes: a switching unit having a first terminal, a second terminal, and a third terminal; a frequency control module connected to the switching unit to send a control signal to the switching unit; the switching unit controlling the first terminal to conduct with the second terminal or the first terminal to conduct with the third terminal according to the control signal, and controlling the direction of the current in the oscillation module; an inductor unit, one end of which is connected to one of the positive and negative terminals of the battery pack, and the other end of which is connected to the first terminal of the switching unit; and a capacitor unit, one end of which is connected to both the second terminal of the switching unit and one of the positive and negative terminals of the battery pack, and the other end of which is connected to the third terminal of the switching unit.

[0008] In one possible implementation, the switching unit includes: a first transistor, the input terminal of which is connected to an inductor unit, and the output terminal of which is connected to one end of a capacitor unit; a second transistor, the input terminal of which is connected to the other end of the capacitor unit, and the output terminal of which is connected to the inductor unit; and a diode, the anode of which is connected to the inductor unit, and the cathode of which is connected to the other end of the capacitor unit.

[0009] In one possible implementation, the frequency control module controls the switching unit to switch between a first state, a second state, and a third state based on operating condition information to control the oscillation charging and discharging frequency; in the first state, the first transistor is turned on to enable the battery pack to charge the inductor unit or the inductor unit to charge the battery pack; in the second state, the first transistor is turned off and the diode is turned on to enable the battery pack and the inductor unit to charge the capacitor unit; in the third state, the second transistor is turned on and the first transistor is turned off to enable the capacitor unit to charge the battery pack and the inductor unit.

[0010] In one possible implementation, the capacitor unit includes a first switch, a second switch, a first capacitor, and a second capacitor; one end of the first capacitor is connected to the battery pack, and the other end of the first capacitor is connected to one end of the first switch and one end of the second switch; one end of the second capacitor is connected to the other end of the second switch, and the other end of the second capacitor is connected to the other end of the first switch and the battery pack.

[0011] In one possible implementation, the capacitor unit further includes at least one third capacitor, and the number of the first switch and the second switch is at least two; one end of the third capacitor is connected to the other end of one of the second switches, and the other end of the third capacitor is connected to the other end of the first switch and one end of another second switch.

[0012] In one possible implementation, at least one of the first capacitor, the second capacitor, and the third capacitor includes multiple capacitors and multiple third switches; the multiple capacitors are connected in parallel, and each capacitor is connected in series with a third switch in a one-to-one correspondence.

[0013] In one possible implementation, a capacitor control module is also included, which is electrically connected to the battery management module, the frequency control module, and the capacitor unit. The frequency control module sends frequency information to the capacitor control module, and the capacitor control module controls the capacity of the capacitor unit based on the operating condition information and the frequency information.

[0014] In one possible implementation, the capacitor control module is connected to the first switch, the second switch, and the third switch. The capacitor control module controls the first switch, the second switch, and the third switch to turn on or off according to the operating condition information and frequency information, so as to control the capacity of the capacitor unit.

[0015] Secondly, this application provides a battery pack, including a battery group and any of the above-mentioned heating devices, wherein the heating device is electrically connected to the battery group.

[0016] The heating device and battery pack provided in this application embodiment include an oscillation module in the heating device that continuously reverses the current to achieve high-frequency oscillating charging and discharging of the battery pack. This oscillating charging and discharging causes the battery pack's temperature to gradually rise, thus achieving self-heating. However, if the oscillation charging frequency is too high, it will lead to excessive energy consumption and may even pose a safety hazard. Therefore, the oscillation charging frequency needs to be adjusted in real time according to the battery pack's state to ensure that the battery pack always oscillates and charges within a safe, low-energy-consumption frequency range. A battery management module detects the battery pack's voltage, charging and discharging current, temperature, and other operating conditions, and sends this information to a frequency control module. The frequency control module calculates a suitable oscillation charging and discharging frequency based on this information and adjusts the oscillation module accordingly. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0018] Figure 1 This is a schematic diagram of the structure of the heating device provided in the embodiments of this application;

[0019] Figure 2 This is a schematic diagram of the structure of the capacitor unit of the heating device provided in the embodiments of this application;

[0020] Figure 3 A diagram illustrating the usage state of the heating device provided in the embodiments of this application;

[0021] Figure 4 A flowchart illustrating the operation of the heating device provided in this application embodiment.

[0022] Explanation of reference numerals in the attached figures:

[0023] 100 - Heating device;

[0024] 110 - Battery Management Module;

[0025] 120 - Oscillation module; 121 - Switching unit; 122 - Inductor unit; 123 - Capacitor unit; 1231 - First capacitor; 1232 - Second capacitor;

[0026] 130 - Frequency Control Module;

[0027] 140 - Capacitor control module;

[0028] 10-Battery pack;

[0029] VT1 - First transistor; VT2 - Second transistor; VD - Diode; K1 - First switch; K2 - Second switch; K3 - Third switch; K4 - Fourth switch; C - Capacitor.

[0030] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0031] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0032] As shown in the background section, existing technologies set up an oscillating circuit connected to the battery pack to enable the battery pack to charge and discharge at a high frequency, thereby achieving self-heating of the battery pack.

[0033] However, simply setting up an oscillation circuit to heat the battery pack makes it impossible to control the charging and discharging frequency of the battery pack. When the charging and discharging frequency is too high, the energy consumption is large and there are certain safety hazards.

[0034] To address the aforementioned technical problems, this application provides a heating device and a battery pack. The heating device includes a battery management module, an oscillation module, and a frequency control module. The frequency control module is electrically connected to both the battery management module and the oscillation module. The heating device and the battery pack together form a closed loop. The oscillation module continuously reverses the current in the loop, thereby achieving high-frequency oscillating charging and discharging of the battery pack. This oscillating charging and discharging causes the battery pack's temperature to gradually increase, thus achieving self-heating. However, if the oscillation charging frequency is too high, it will lead to excessive energy consumption and may even pose a safety hazard. Therefore, it is necessary to adjust the oscillation charging frequency in real time according to the battery pack's status to ensure that the battery pack always oscillates and charges within a safe and low-energy-consumption frequency range. The battery management module detects the voltage, charging and discharging current, temperature, and other operating conditions of the battery pack and sends this information to the frequency control module. The frequency control module calculates a suitable oscillation charging and discharging frequency based on the operating conditions and adjusts the oscillation module accordingly.

[0035] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings:

[0036] It should be noted that the heating device provided in this application embodiment can be applied to various battery packs.

[0037] See Figure 1 and Figure 3 As shown, the heating device 100 of this application embodiment is used for a battery pack and includes: a battery management module 110, an oscillation module 120, and a frequency control module 130. The battery management module 110 is used to detect the operating condition information of the battery pack 10 in the battery pack; the two ends of the oscillation module 120 are respectively used to connect to the positive and negative terminals of the battery pack 10 to make the battery pack 10 oscillate for charging and discharging; the frequency control module 130 is electrically connected to both the oscillation module 120 and the battery management module 110 to control the frequency of oscillation for charging and discharging according to the operating condition information.

[0038] In this embodiment, the two ends of the oscillation module 120 are connected to the positive and negative terminals of the battery pack 10 respectively to form a closed loop. The oscillation module 120 can control the current in the loop to continuously reverse, so that the battery pack 10 oscillates and charges and discharges at a certain frequency, thereby realizing the self-heating of the battery pack 10 and increasing the temperature of the battery pack 10.

[0039] However, when the operating conditions of the battery pack 10, such as temperature, voltage, and charging / discharging current, are different, the suitable frequency range for oscillating charging and discharging of the battery pack 10 is different. If the oscillating charging and discharging frequency is too high, it may lead to excessive energy consumption and safety hazards. If the frequency is too low, it is difficult to achieve the effect of quickly raising the temperature of the battery pack 10. Therefore, it is necessary to set up a battery management module 110 to detect the operating conditions of the battery pack 10. The operating conditions information may include the temperature, voltage, charging / discharging current, and charge of the battery pack 10. This application embodiment does not limit this and can detect it according to specific needs. The battery management module 110 sends the detected operating conditions information to the frequency control module 130. The frequency control module 130 calculates the suitable oscillating charging and discharging frequency of the battery pack 10 at this time based on the operating conditions information. By adjusting the oscillation module 120 to control the oscillating charging and discharging frequency of the battery pack 10, it is beneficial to ensure that the battery pack 10 always charges and discharges at a suitable frequency. While ensuring that the battery pack 10 can achieve self-heating and increase the temperature of the battery pack 10, it saves the consumed energy, improves the safety of the battery pack 10, and helps to ensure the safe and stable operation of the battery pack.

[0040] See also some of the possible implementation methods. Figure 1 and Figure 3 As shown, the oscillation module 120 of this application embodiment includes: a switching unit 121, an inductor unit 122, and a capacitor unit 123. The switching unit 121 has a first terminal, a second terminal, and a third terminal. The frequency control module 130 is connected to the switching unit 121 to send a control signal to the switching unit 121. The switching unit 121 controls the first terminal to be connected to the second terminal or the first terminal to the third terminal according to the control signal, and controls the current direction in the oscillation module 120. One end of the inductor unit 122 is used to connect to one of the positive and negative terminals of the battery pack 10, and the other end of the inductor unit 122 is connected to the first terminal of the switching unit 121. One end of the capacitor unit 123 is connected to both the second terminal of the switching unit 121 and the other of the positive and negative terminals of the battery pack 10, and the other end of the capacitor unit 123 is connected to the third terminal of the switching unit 121.

[0041] In practical implementation, in the circuit formed by the oscillation module 120 and the battery pack 10, the battery pack 10, inductor unit 122, switch unit 121, and capacitor unit 123 are connected in sequence. When the first terminal and the second terminal are connected, the capacitor unit 123 is short-circuited, and the circuit is equivalent to only the battery pack 10 and the inductor unit 122. At this time, the current in the circuit is unidirectional, and it can only include two modes: battery pack 10 discharging and inductor unit 122 charging, or inductor unit 122 discharging and battery pack 10 charging. When the first terminal and the third terminal are connected, the circuit is equivalent to the battery pack 10, inductor unit 122, and capacitor unit 123 being connected in series, thus forming an oscillation circuit. The current in the circuit will continuously reverse, thereby charging and discharging the battery pack 10 at a higher frequency. Therefore, the frequency control module 130 can change the direction of the current in the circuit by controlling the connection or disconnection of the first terminal and the second terminal or the first terminal and the third terminal of the switch unit 121, thereby adjusting the oscillation charging and discharging frequency of the battery pack 10.

[0042] See also some of the possible implementation methods. Figure 1 and Figure 3 As shown, the switching unit 121 in this embodiment includes: a first transistor VT1, a second transistor VT2, and a diode VD. The input terminal of the first transistor VT1 is connected to the inductor unit 122, and the output terminal of the first transistor VT1 is connected to one end of the capacitor unit 123. The input terminal of the second transistor VT2 is connected to the other end of the capacitor unit 123, and the output terminal of the second transistor VT2 is connected to the inductor unit 122. The anode of the diode VD is connected to the inductor unit 122, and the cathode of the diode VD is connected to the other end of the capacitor unit 123.

[0043] In some embodiments, the first transistor VT1 and the second transistor VT2 can both be configured as unidirectional thyristors to limit the current flow from the input terminal to the output terminal. The frequency control module 130 can control the conduction or disconnection of the first transistor VT1 and the second transistor VT2 to short-circuit or connect the capacitor unit 123 to the circuit, thereby realizing the control of the oscillation charging and discharging frequency.

[0044] See also some of the possible implementation methods. Figure 1 and Figure 3 As shown, in this embodiment, the frequency control module 130 controls the switching unit 121 to switch between a first state, a second state, and a third state according to the operating condition information to control the oscillation charging and discharging frequency. In the first state, the first transistor VT1 is turned on so that the battery pack 10 charges the inductor unit 122 or the inductor unit 122 charges the battery pack 10. In the second state, the first transistor VT1 is turned off and the diode VD is turned on so that the battery pack 10 and the inductor unit 122 charge the capacitor unit 123. In the third state, the second transistor VT2 is turned on and the first transistor VT1 is turned off so that the capacitor unit 123 charges the battery pack 10 and the inductor unit 122.

[0045] In practical implementation, after the heating device 100 starts working, the frequency control module 130 first controls the switching unit 121 to enter the first state, and the first transistor VT1 is turned on. At this time, the input terminal of the first transistor VT1 is connected to the positive terminal of the battery pack 10, and the output terminal of the first transistor VT1 is connected to the negative terminal of the battery pack 10. Therefore, a unidirectional current is formed in the circuit from the positive terminal to the negative terminal of the battery pack 10, the capacitor unit 123 is short-circuited, and the battery pack 10 charges the inductor unit 122. Then, the switching unit 121 is controlled to enter the second state, the first transistor VT1 is turned off, and the second transistor VT2 is also turned off. The positive terminal of the diode VD is connected to the positive terminal of the battery pack 10. Therefore, the circuit is still a unidirectional current. Unlike the first state, the capacitor unit 123 is connected to the circuit, and the inductor unit 122 is short-circuited. 2. Battery pack 10 can charge capacitor unit 123 simultaneously; then, it enters the third state, where the first transistor VT1 remains off and the second transistor VT2 is on. The input and output terminals of the second transistor VT2 are opposite to those of the first transistor VT1 and diode VD. Therefore, the current in the circuit can be reversed at this time. The current through diode VD is opposite to the current through the second transistor VT2, forming an oscillating circuit. Capacitor unit 123 begins to charge battery pack 10 and inductor unit 122. After the third state ends, it switches back to the first state. At this time, inductor unit 122 can charge the battery pack, thus completing one round of heating. If the temperature of battery pack 10 is still low, the above process can be repeated for heating. If the temperature of battery pack 10 has reached the preset temperature, heating can be stopped.

[0046] Therefore, the frequency control module 130 controls the frequency of oscillating charging and discharging by switching the control switch unit 121 between the first state, the second state, and the third state. The frequency control module 130 can also detect the actual frequency of oscillating charging and discharging in the circuit. The switching conditions can be determined based on the actual frequency of oscillating charging and discharging and the operating conditions of the battery pack 10. For example, when the frequency reaches a first preset value, the system switches from the first state to the second state. Specific switching conditions are not limited in this embodiment.

[0047] See also some of the possible implementation methods. Figure 1 , Figure 2 and Figure 3 As shown, the capacitor unit 123 in this embodiment includes a first switch K1, a second switch K2, a first capacitor 1231, and a second capacitor 1232. One end of the first capacitor 1231 is connected to the battery pack 10, and the other end of the first capacitor 1231 is connected to one end of the first switch K1 and one end of the second switch K2. One end of the second capacitor 1232 is connected to the other end of the second switch K2, and the other end of the second capacitor 1232 is connected to the other end of the first switch K1 and the battery pack 10.

[0048] It is understandable that when the first switch K1 is on and the second switch K2 is off, only the first capacitor 1231 is connected to the circuit. When the first switch K1 is off and the second switch K2 is on, the first capacitor 1231 and the second capacitor 1232 are connected in series and simultaneously connected to the circuit. Therefore, the capacitance of the capacitor unit 123 can be adjusted by controlling the on or off state of the first switch K1 and the second switch K2.

[0049] See also some of the possible implementation methods. Figure 1 , Figure 2 and Figure 3 As shown, the capacitor unit 123 in this embodiment of the application further includes at least one third capacitor (not shown in the figure), and the number of the first switch K1 and the second switch K2 is at least two; one end of the third capacitor is connected to the other end of one second switch K2, and the other end of the third capacitor is connected to the other end of the first switch K1 and one end of another second switch K2.

[0050] Furthermore, at least one third capacitor can be provided in the capacitor unit 123. The first capacitor 1231, the second capacitor 1232 and each third capacitor are connected in series. By controlling the conduction or disconnection of each first switch K1 and the second switch K2, the number of third capacitors connected to the circuit can be adjusted, thereby further improving the adjustable range of the capacitance of the capacitor unit 123.

[0051] See also some of the possible implementation methods. Figure 1 , Figure 2 and Figure 3As shown, at least one of the first capacitor 1231, the second capacitor 1232, and the third capacitor in this embodiment includes multiple capacitors C and multiple third switches K3; the multiple capacitors are connected in parallel, and the capacitors are connected in series with the third switches K3 in a one-to-one correspondence.

[0052] It is understood that the first capacitor 1231, the second capacitor 1232, and the third capacitor each contain multiple capacitors and a third switch K3 corresponding to each capacitor. By controlling the number of times the third switch K3 is turned on, the number of capacitors C connected to the circuit in the first capacitor 1231, the second capacitor 1232, and the third capacitor can be controlled, thereby adjusting the capacitance of the first capacitor 1231, the second capacitor 1232, and the third capacitor.

[0053] In this embodiment, the number of capacitors C in the first capacitor 1231, the second capacitor 1232, and the third capacitor can be the same or different. This application does not limit this. The value range of the number of capacitors C in the first capacitor 1231, the second capacitor 1232, and the third capacitor can be 2-100000. For example, the number of capacitors can be 2, 10, 50, 100, 500, 1000, 5000, 10000, 50000, or 100000. Of course, this application does not limit this. The capacitance of capacitor C can be reasonably selected within the above range as needed.

[0054] See also some of the possible implementation methods. Figure 1 , Figure 2 and Figure 3 As shown, this embodiment of the application also includes a capacitor control module 140, which is electrically connected to the battery management module 110, the frequency control module 130, and the capacitor unit 123. The frequency control module 130 sends frequency information to the capacitor control module 140, and the capacitor control module 140 controls the capacity of the capacitor unit 123 according to the operating condition information and the frequency information.

[0055] In some embodiments, the capacitor control module 140 can calculate the appropriate capacity of the capacitor unit 123 based on operating condition information and frequency information, and adjust the capacity of the capacitor unit 123 according to the calculated capacity. This facilitates heating the battery pack 10 with lower energy consumption and saves heating costs of the heating device 100.

[0056] See also some of the possible implementation methods. Figure 1 , Figure 2 and Figure 3 As shown, in this embodiment of the application, the capacitor control module 140 is connected to the first switch K1, the second switch K2 and the third switch K3. The capacitor control module 140 controls the first switch K1, the second switch K2 and the third switch K3 to turn on or off according to the operating condition information and frequency information, so as to control the capacity of the capacitor unit 123.

[0057] It is understood that the capacitor control module 140 can control whether the second capacitor 1232 is connected to the circuit and the number of third capacitors connected to the circuit by controlling the on / off state of the first switch K1 and the second switch K2. It can control the number of capacitors C connected to the circuit in the first capacitor 1231, the second capacitor 1232, or the third capacitor by controlling the on / off state of the third switch K3, thereby adjusting the capacitance of the capacitor unit 123. When the frequency is too high, the capacitance of the capacitor unit 123 can be increased by increasing the number of third capacitors connected, or by increasing the number of second capacitors 1232 connected, or by increasing the number of capacitors C connected to the circuit in the first capacitor 1231, the second capacitor 1232, or the third capacitor, thereby controlling the frequency of oscillation charging and discharging. For example, when the frequency of oscillation charging and discharging is higher than 3000 Hz, multiple third capacitors can be connected for adjustment. The specific frequency range and adjustment method can be selected according to the actual situation, and this embodiment does not limit this.

[0058] For example, see Figure 4 As shown, the heating device 100 can operate as follows: a fourth switch K4 can be installed between the inductor unit 122 and the battery pack 10 to control the connection or disconnection between the battery pack 10 and the heating device 100. The battery management module 110 monitors the temperature and voltage of the battery pack 10 in real time to determine whether the battery pack 10 needs heating. When the battery pack 10 needs heating, the battery management module 110 first sends the operating condition information to the frequency control module 130 and the capacitor control module 140 simultaneously. The frequency control module 130 calculates a suitable oscillation charging and discharging frequency based on the operating condition information and determines the switching unit 121 based on this frequency. The switching frequency in each state is determined by the capacitor control module 140, which calculates and adjusts the appropriate capacity of the capacitor unit 123 based on the operating condition information. After adjustment, the battery management module 110 controls the detection of whether the fourth switch K4 is closed. If it is not closed, it controls the fourth switch K4 to close. After the fourth switch K4 is closed, the frequency control module 130 starts to control the switch unit 121 to switch between the first state, the second state, and the third state. After one heating cycle, the battery management module 110 determines again whether the battery pack 10 needs to be heated. If heating is needed, the above steps are repeated. If heating is not needed, the fourth switch K4 is disconnected, and the heating device 100 stops heating.

[0059] See Figure 1 and Figure 3 As shown, this application embodiment also provides a battery pack, including a battery pack 10 and any of the above-mentioned heating devices 100, wherein the heating device 100 is electrically connected to the battery pack 10.

[0060] The structure and working principle of the heating device 100 have been described in detail in the above embodiments, and will not be repeated here.

[0061] In this embodiment of the application, by setting up a heating device 100, when the temperature of the battery pack 10 is low, the battery pack 10 can be self-heated to increase its temperature, which is beneficial to keep the battery pack 10 working within a suitable temperature range, thereby improving the working performance of the battery pack and ensuring the safe and stable operation of the battery pack.

[0062] In summary, the heating device 100 and battery pack provided in this application embodiment include a battery management module 110, an oscillation module 120, and a frequency control module 130. The battery management module 110 determines whether the battery pack 10 needs heating by detecting the operating condition information of the battery pack 10 in the battery pack. If heating is required, the operating condition information is sent to the frequency control module 130. The frequency control module 130 can calculate a suitable oscillation charging and discharging frequency for the battery pack 10 based on the operating condition information and adjust the oscillation module 120 according to the frequency. This ensures that the battery pack 10 oscillates and charges and discharges at different frequencies under different conditions, reducing energy consumption during heating without affecting the heating effect. It also helps improve the safety of the heated battery pack 10 and ensures the safe and stable operation of the battery pack.

[0063] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0064] The devices or elements referred to in the embodiments of this application or implied herein must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of this application. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise precisely specified.

[0065] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein.

[0066] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such that a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or apparatus.

[0067] The term "multiple" in this article refers to two or more. The term "and / or" in this article is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent three cases: A exists alone, A and B exist simultaneously, and B exists alone.

[0068] It is understood that the various numerical designations used in the embodiments of this application are merely for descriptive convenience and are not intended to limit the scope of the embodiments of this application.

[0069] It is understood that, in the embodiments of this application, the order of the above-mentioned process numbers does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0070] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the utility models disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0071] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A heating device (100) for a battery pack, characterized in that, include: The battery management module (110) is used to detect the operating status information of the battery pack (10) in the battery pack; An oscillation module (120) is provided, with its two ends connected to the positive and negative terminals of the battery pack (10) respectively, so that the battery pack (10) can oscillate to charge and discharge. A frequency control module (130) is electrically connected to both the oscillation module (120) and the battery management module (110) to control the frequency of the oscillation charging and discharging according to the operating condition information.

2. The heating device (100) according to claim 1, characterized in that, The oscillation module (120) includes: A switching unit (121) has a first terminal, a second terminal and a third terminal. The frequency control module (130) is connected to the switching unit (121) to send a control signal to the switching unit (121). The switching unit (121) controls the first terminal to conduct with the second terminal or the first terminal to conduct with the third terminal according to the control signal, and controls the current direction in the oscillation module (120). An inductor unit (122) is provided, one end of which is connected to one of the positive and negative terminals of the battery pack (10), and the other end of which is connected to the first terminal of the switch unit (121). A capacitor unit (123) is provided, one end of which is connected to the second end of the switch unit (121) and the other of the positive and negative terminals of the battery pack (10), and the other end of the capacitor unit (123) is connected to the third end of the switch unit (121).

3. The heating device (100) according to claim 2, characterized in that, The switching unit (121) includes: The first transistor has its input terminal connected to the inductor unit (122) and its output terminal connected to one end of the capacitor unit (123). The second transistor has its input terminal connected to the other end of the capacitor unit (123) and its output terminal connected to the inductor unit (122). A diode, the positive terminal of which is connected to the inductor unit (122), and the negative terminal of which is connected to the other end of the capacitor unit (123).

4. The heating device (100) according to claim 3, characterized in that, The frequency control module (130) controls the switching unit (121) to switch between the first state, the second state and the third state according to the operating condition information, so as to control the oscillation charging and discharging frequency; In the first state, the first transistor is turned on so that the battery pack (10) charges the inductor unit (122) or the inductor unit (122) charges the battery pack (10); In the second state, the first transistor is turned off and the diode is turned on, so that the battery pack (10) and the inductor unit (122) charge the capacitor unit (123); In the third state, the second transistor is turned on and the first transistor is turned off, so that the capacitor unit (123) charges the battery pack (10) and the inductor unit (122).

5. The heating device (100) according to claim 2, characterized in that, The capacitor unit (123) includes a first switch, a second switch, a first capacitor (1231), and a second capacitor (1232); One end of the first capacitor (1231) is connected to the battery pack (10), and the other end of the first capacitor (1231) is connected to one end of the first switch and one end of the second switch; One end of the second capacitor (1232) is connected to the other end of the second switch, and the other end of the second capacitor (1232) is connected to the other end of the first switch and the battery pack (10).

6. The heating device (100) according to claim 5, characterized in that, The capacitor unit (123) further includes at least one third capacitor, and the number of the first switch and the second switch is at least two; One end of the third capacitor is connected to the other end of a second switch, and the other end of the third capacitor is connected to the other end of the first switch and one end of another second switch.

7. The heating device (100) according to claim 6, characterized in that, At least one of the first capacitor (1231), the second capacitor (1232), and the third capacitor includes a plurality of capacitors and a plurality of third switches; The multiple capacitors are connected in parallel, and each capacitor is connected in series with the third switch in a one-to-one correspondence.

8. The heating device (100) according to claim 7, characterized in that, It also includes a capacitor control module (140), which is electrically connected to the battery management module (110), the frequency control module (130) and the capacitor unit (123); The frequency control module (130) sends frequency information to the capacitor control module (140), and the capacitor control module (140) controls the capacity of the capacitor unit (123) according to the operating condition information and the frequency information.

9. The heating device (100) according to claim 8, characterized in that, The capacitor control module (140) is connected to the first switch, the second switch and the third switch. The capacitor control module (140) controls the first switch, the second switch and the third switch to be turned on or off according to the operating condition information and the frequency information, so as to control the capacity of the capacitor unit (123).

10. A battery pack, characterized in that, It includes a battery pack (10) and a heating device (100) as described in any one of claims 1-9, wherein the heating device (100) is electrically connected to the battery pack (10).

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