Battery pack and electric equipment
By controlling the inverter control module to output pulses and charging signals through the battery management module, the problem of difficult charging of the battery pack in low-temperature environments is solved, achieving reliable charging of the battery pack and reducing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-15
- Publication Date
- 2026-03-10
AI Technical Summary
In existing technologies, battery packs are difficult to charge in low-temperature environments, and the use of heating films increases costs and poses potential safety risks.
The battery management module controls the inverter control module to output pulse and charging signals, thereby heating and charging the battery pack. Sine wave signals are used to control the current and time, avoiding lithium plating and reducing costs.
This enables reliable charging of the battery pack in low-temperature environments, reducing costs and improving safety.
Smart Images
Figure CN223986596U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of electronics, and in particular to a battery pack and an electric device. BACKGROUND
[0002] Battery packs are widely used in portable electronic devices, electric vehicles, energy storage systems, and other fields requiring high energy density power sources. However, in low temperature environments, the performance of the battery pack will be significantly affected. Specifically, under low temperature conditions, the battery pack may face the problem of charging difficulty, and can only be charged at a very low current. If the charging current is slightly increased, lithium ions may be precipitated on the negative electrode surface, which has a serious impact on the cycle life of the battery pack.
[0003] To solve this problem, the prior art usually uses a heating film to heat the battery pack, but this not only greatly increases the cost, but also may cause the heating film to overheat if the temperature control is not proper, causing potential safety risks and unpredictable damage. CONTENT OF THE UTILITY MODEL
[0004] Therefore, the embodiments of the present application provide a battery pack and an electric device, which can effectively solve the problem of the prior art that using a heating film to heat the battery pack greatly increases the cost, and even causes potential safety risks and unpredictable damage.
[0005] In a first aspect, the embodiments of the present application provide a battery pack, comprising: an inverter control module, a battery pack, and a battery management module, an input end of the inverter control module is used to connect a charging device, an output end of the inverter control module is connected to the battery pack, and the battery management module is electrically connected to a control end of the inverter control module.
[0006] The battery management module is used to control the inverter control module to output a pulse signal to the battery pack when it is detected that the temperature of the battery pack is lower than a first preset temperature, so as to raise the temperature of the battery pack.
[0007] When it is detected that the temperature of the battery pack is not lower than a second preset temperature, the inverter control module is controlled to output a charging signal to the battery pack to charge the battery pack, and the second preset temperature is not lower than the first preset temperature.
[0008] In some embodiments, the inverter control module comprises a signal switching unit and an inverter output unit, an input end of the signal switching unit is electrically connected with the charging device, a first output end of the signal switching unit is electrically connected with an input end of the inverter output unit, a control end of the signal switching unit is electrically connected with the battery management module, a second output end of the signal switching unit is electrically connected with the battery pack, an output end of the inverter output unit is electrically connected with the battery pack, and a control end of the inverter output unit is electrically connected with the battery management module.
[0009] In some embodiments, the inverter control module further comprises a drive chip, an input end of the drive chip is electrically connected with the battery management module, and an output end of the drive chip is electrically connected with the control end of the inverter output unit.
[0010] In some embodiments, the inverter output unit comprises four switching devices constituting a double-bridge arm structure.
[0011] Two ends of the double-bridge arm structure are electrically connected with the output end of the signal switching unit, a midpoint of a first bridge arm is connected with a positive electrode end of the battery pack, and a midpoint of a second bridge arm is connected with a negative electrode end of the battery pack.
[0012] In some embodiments, each of the switching devices is a switching tube.
[0013] In some embodiments, the signal switching unit comprises a charging switch subunit and a heating switch subunit.
[0014] An input end of the charging switch subunit is used for connecting the charging device, an output end of the charging switch subunit is connected with the battery pack, and a control end of the charging switch subunit is electrically connected with the battery management module.
[0015] An input end of the heating switch subunit is used for connecting the charging device, an output end of the heating switch subunit is connected with the input end of the inverter output unit, and a control end of the heating switch subunit is electrically connected with the battery management module.
[0016] In some embodiments, the battery management module is communicatively connected with the charging device, and the battery management module is further used for controlling the charging device to output an electric energy signal.
[0017] In some embodiments, the second preset temperature is a sum of the first preset temperature and a third preset temperature.
[0018] In some embodiments, a waveform of the pulse signal is a sine wave.
[0019] Secondly, embodiments of this application provide an electric device, the electric device including at least one battery pack as described in the first aspect above.
[0020] The embodiments of this application have the following beneficial effects:
[0021] The battery pack of this application includes: an inverter control module, a battery pack, and a battery management module. The input terminal of the inverter control module is connected to a charging device, and the output terminal of the inverter control module is connected to the battery pack. The battery management module is electrically connected to the control terminal of the inverter control module. When the battery pack temperature is detected to be lower than a first preset temperature, the battery management module controls the inverter control module to output a pulse signal to the battery pack to raise its temperature. When the battery pack temperature is detected to be not lower than a second preset temperature, the battery management module controls the inverter control module to output a charging signal to the battery pack to charge it. The second preset temperature is not lower than the first preset temperature. This application achieves heating and charging of the battery pack by controlling the inverter control module through the battery management module in the battery pack, ensuring the reliability of battery pack charging while reducing the cost of the battery pack. Attached Figure Description
[0022] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0023] Figure 1 A first structural schematic diagram of the battery pack according to an embodiment of this application is shown;
[0024] Figure 2 A schematic diagram of the waveform of the pulse signal according to an embodiment of this application is shown;
[0025] Figure 3 A second structural schematic diagram of the battery pack according to an embodiment of this application is shown;
[0026] Figure 4 A circuit diagram of a battery pack according to an embodiment of this application is shown.
[0027] Explanation of key component symbols:
[0028] 11: Inverter control module; 12: Battery pack; 13: Battery management module; 14: Charging device; 111: Signal switching unit; 112: Inverter output unit; 113: Driver chip. Detailed Implementation
[0029] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.
[0030] The components of the embodiments of this application described and illustrated in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0031] In the following text, the terms "comprising," "having," and their cognates, which may be used in various embodiments of this application, are intended only to indicate a particular feature, number, step, operation, element, component, or combination thereof, and should not be construed as primarily excluding the presence of one or more other features, numbers, steps, operations, elements, components, or combinations thereof, or adding the possibility of one or more combinations thereof. Furthermore, the terms "first," "second," "third," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance.
[0032] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of this application pertain. Terms (such as those defined in commonly used dictionaries) shall be interpreted as having the same meaning as in their contextual meaning in the relevant technical field and shall not be construed as having an idealized or overly formal meaning, unless clearly defined in the various embodiments of this application.
[0033] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.
[0034] Considering the significant cost increase and potential safety risks and unforeseen damage associated with using heating films to heat battery packs in existing technologies, this application proposes a battery pack and electric device. This application achieves heating and charging of the battery pack by controlling the inverter control module through the battery management module within the battery pack, ensuring reliable battery pack charging while reducing battery pack costs.
[0035] The battery pack will be described below with reference to some specific embodiments.
[0036] Figure 1A schematic diagram of a battery pack according to an embodiment of this application is shown. Exemplarily, the battery pack includes: an inverter control module 11, a battery pack 12, and a battery management module 13. The input terminal of the inverter control module 11 is connected to a charging device, the output terminal of the inverter control module 11 is connected to the battery pack 12, and the control terminal of the inverter control module 11 is electrically connected to the battery management module 13. It is understood that the charging device can be any type of battery charger, and the inverter control module 11 can convert the DC signal output by the charging device into an AC signal to heat the battery pack 12 based on the signal from the battery management module 13.
[0037] The output pulse signal can be adjusted by controlling the inverter control module 11 according to the actual application, thereby controlling the current and time input to the battery pack 12. For example, Figure 2 As shown, the waveform of the pulse signal is a sine wave.
[0038] As an example, the peak value of the sine wave is inversely proportional to the pulse width, meaning the current input to battery pack 12 is inversely proportional to the duration of the current. The shorter the duration, the larger the current value. The product of current and time is between 0.001 and 1. For example, if the current is set to 10A and the duration is set to 1ms, the positive half-wave of the sine wave represents a large current of 10A output in 1ms. The energy of this large current in a very short time enables battery pack 12 to generate its own heat. The negative half-wave of the sine wave represents a large current for discharging battery pack 12. The duration of the negative half-wave allows lithium in the negative electrode of battery pack 12 to diffuse freely, preventing lithium plating at the negative electrode. The heat generation of the sine wave is equivalent to AC internal resistance heat generation, resulting in uniform heating, rapid temperature rise, and minimal impact on the lifespan of battery pack 12.
[0039] Examplely, the battery management module 13 is a battery management chip that can acquire the temperature of the battery pack 12 in real time. The battery management module 13 is communicatively connected to the charging device and is used to control the output of the charging device to generate electrical energy signals. It is understood that the electrical energy signals are DC signals.
[0040] Specifically, when the charging device is connected, the battery management module 13 communicates with the charging device. When the temperature of the battery pack 12 obtained by the battery management module 13 is lower than the first preset temperature, the charging device is controlled to output a DC signal to the inverter control module 11, and the inverter control module 11 is controlled to generate an AC pulse signal to the battery pack 12 according to the DC signal, so that the battery pack 12 is heated. When the temperature of the battery pack 12 obtained by the battery management module 13 is not lower than the second preset temperature, the inverter control module 11 is controlled to supply power to the battery pack 12 normally, so that the battery pack 12 is charged normally.
[0041] The first and second preset temperatures can be set according to the actual application. It is understood that the second preset temperature is not lower than the first preset temperature. Furthermore, the second preset temperature is the sum of the first and third preset temperatures. For example, the first preset temperature is 5 degrees Celsius, and the second preset temperature is 10 degrees Celsius.
[0042] In this embodiment, the battery pack is equipped with an inverter control module 11. When the battery management module 13 detects that the battery pack 12 needs to be heated, it controls the inverter control module 11 to convert the electrical energy signal of the charging device into an AC signal to the battery pack 12, so that the battery pack 12 is heated. When the battery management module 13 detects that the battery pack 12 does not need to be heated, it controls the inverter control module 11 to use the electrical energy signal of the charging device to supply power to the battery pack 12, so that the battery is charged. This reduces the cost of the battery pack while greatly ensuring the reliability of the battery.
[0043] As an alternative solution, Figure 3 The diagram shown is a schematic of another structure of a battery pack. Accordingly, Figure 4 As shown Figure 3 A circuit diagram of a battery pack.
[0044] In one embodiment, based on the above embodiments, such as Figure 3 and Figure 4 As shown, the inverter control module 11 includes a signal switching unit 111 and an inverter output unit 112. The input terminal of the signal switching unit 111 is electrically connected to the charging device 14, the first output terminal of the signal switching unit 111 is electrically connected to the input terminal of the inverter output unit 112, the control terminal of the signal switching unit 111 is electrically connected to the battery management module 13, and the second output terminal of the signal switching unit 111 is electrically connected to the battery pack 12.
[0045] Understandably, a switching device should be provided in the signal switching unit 111. The battery management module 13 controls the signal switching unit 111 to switch the direction of the power signal flow of the charging device 14, so that the power signal flows to the inverter output unit 112 or directly to the battery pack 12.
[0046] Specifically, the signal switching unit 111 includes a charging switch subunit and a heating switch subunit. The charging switch subunit is used to allow the electrical energy signal to flow directly to the battery pack 12 according to the signal from the battery management module 13, and the heating switch subunit is used to allow the electrical energy signal to flow to the inverter output unit 112 according to the signal from the battery management module 13.
[0047] The input terminal of the charging switch subunit is used to connect to the charging device 14, the output terminal of the charging switch subunit is connected to the battery pack 12, and the control terminal of the charging switch subunit is electrically connected to the battery management module 13.
[0048] The input terminal of the heating switch subunit is used to connect to the charging device 14, the output terminal of the heating switch subunit is connected to the input terminal of the inverter output unit 112, and the control terminal of the heating switch subunit is electrically connected to the battery management module 13.
[0049] Understandably, the switching device in the signal switching unit 111 can be one or more of a switching transistor, optocoupler, or relay, as exemplified by, for example Figure 4 As shown, the charging switch subunit includes a switch Q1 and a switch Q7. When the switch Q1 and the switch Q7 are turned on, the battery pack 12 is charged. The heating switch subunit includes a switch Q2. When the switch Q2 is turned on, the electrical energy signal flows to the inverter output unit 112.
[0050] The output terminal of the inverter output unit 112 is electrically connected to the battery pack 12, and the control terminal of the inverter output unit 112 is electrically connected to the battery management module 13. The inverter output unit 112 is used to convert the electrical energy signal of the charging device 14 into a pulse signal. The inverter output unit 112 includes four switching devices forming a double-bridge structure. The two ends of the double-bridge structure are electrically connected to the output terminal of the signal switching unit 111. The midpoint of the first bridge arm is connected to the positive terminal of the battery pack 12, and the midpoint of the second bridge arm is connected to the negative terminal of the battery pack 12.
[0051] Understandably, the switching devices in the inverter output unit 112 can be MOSFETs, IGBTs, etc. For example, Figure 4 Figure 4 As shown, the inverter output unit 112 includes switching transistors Q3, Q4, Q5, and Q6. The input terminal of switching transistor Q3 is connected to the output terminal of switching transistor Q2, the output terminal of switching transistor Q3 is connected to the input terminal of switching transistor Q4, the output terminal of switching transistor Q4 is grounded, the center node of switching transistors Q3 and Q4 is connected to the positive terminal of battery pack 12, the input terminal of switching transistor Q5 is connected to the output terminal of switching transistor Q2, the output terminal of switching transistor Q5 is connected to the input terminal of switching transistor Q6, the output terminal of switching transistor Q6 is grounded, and the center node of switching transistors Q5 and Q6 is connected to the negative terminal of battery pack 12.
[0052] To enhance driving capability, the inverter control module 11 further includes a driver chip 113. The input terminal of the driver chip 113 is electrically connected to the battery management module 13, and the output terminal of the driver chip 113 is electrically connected to the control terminal of the inverter output unit 112. The driver chip 113 is used to amplify the current and convert the level of the signal from the battery management module 13, greatly improving the reliability of the system.
[0053] The working process of the battery pack in this embodiment is as follows: When the charging device 14 is connected, the battery management module 13 communicates with the charging device 14. When the temperature of the battery pack 12 obtained by the battery management module 13 is lower than the first preset temperature, the battery management module 13 outputs the turn-on signal of the switch Q2, the switch Q2 is turned on, the switch Q1 and the switch Q7 remain off, and outputs a signal to the driver chip 113, so that the driver chip 113 closes the switch Q3 and the switch Q6 to charge the battery pack 12 with a large current after receiving the signal. Then, the switch Q3 and the switch Q6 are turned off, and the switch Q4 and the switch Q5 are closed at the same time to discharge the battery pack 12. By controlling the battery pack 12 to continuously perform large current charging and discharging, the battery pack 12 is heated.
[0054] In this embodiment, the battery pack uses a driver chip 113 to drive the switching transistors of the inverter output unit 112. The driver chip 113 can provide sufficient gate drive current to ensure that the switching transistors can be turned on and off quickly. It can also perform level conversion, converting the signal output by the battery management module 13 into a level signal suitable for the gate drive of the switching transistors, ensuring the reliable operation of the switching transistors. Furthermore, this embodiment uses the switching transistors to form a dual-bridge structure for inverter output. Full-bridge inverters can provide higher output frequency and better efficiency, while also increasing the output voltage amplitude, which greatly improves the quality of the output signal. This embodiment also uses the switching subunit to control the signal flow, which greatly improves the reliability of the system.
[0055] This application also provides an electric device, exemplary of which includes the battery pack described above. It is understood that the electric device can be any type of electric device; it can be a car, or it can be a two-wheeled electric vehicle. Exemplarily, the electric device is a two-wheeled electric vehicle.
[0056] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can also be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings show the architecture, functionality, and operation of possible implementations of apparatus, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that, in alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, and combinations of blocks in the block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.
[0057] In addition, the functional modules or units in the various embodiments of this application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.
[0058] If the aforementioned functions are implemented as software functional modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a smartphone, personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application.
[0059] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.
Claims
1. A battery pack, characterized by, The application relates to an electric battery pack for an electric device. The electric battery pack comprises an inverter control module, a battery pack and a battery management module, an input end of the inverter control module is connected with a charging device, an output end of the inverter control module is connected with the battery pack, and a control end of the inverter control module is electrically connected with the battery management module. The battery management module is used for controlling the inverter control module to output a pulse signal to the battery pack when detecting that the temperature of the battery pack is lower than a first preset temperature, so as to increase the temperature of the battery pack. The battery management module is used for controlling the inverter control module to output a charging signal to the battery pack when detecting that the temperature of the battery pack is not lower than a second preset temperature, so as to charge the battery pack, and the second preset temperature is not lower than the first preset temperature.
2. The battery pack of claim 1, wherein, The inverter control module comprises a signal switching unit and an inverter output unit, an input end of the signal switching unit is electrically connected with the charging device, a first output end of the signal switching unit is electrically connected with an input end of the inverter output unit, a control end of the signal switching unit is electrically connected with the battery management module, a second output end of the signal switching unit is electrically connected with the battery pack, an output end of the inverter output unit is electrically connected with the battery pack, and a control end of the inverter output unit is electrically connected with the battery management module.
3. The battery pack of claim 2, wherein, The inverter control module further comprises a driving chip, an input end of the driving chip is electrically connected with the battery management module, and an output end of the driving chip is electrically connected with the control end of the inverter output unit.
4. The battery pack of claim 2, wherein, The inverter output unit comprises four switching devices forming a double-bridge arm structure. Two ends of the double-bridge arm structure are electrically connected with the output end of the signal switching unit, a midpoint of a first bridge arm is connected with a positive electrode end of the battery pack, and a midpoint of a second bridge arm is connected with a negative electrode end of the battery pack.
5. The battery pack of claim 4, wherein, Each of the switching devices is a switching tube.
6. The battery pack of claim 2, wherein, The signal switching unit comprises a charging switch subunit and a heating switch subunit. An input end of the charging switch subunit is connected with the charging device, an output end of the charging switch subunit is connected with the battery pack, and a control end of the charging switch subunit is electrically connected with the battery management module. An input end of the heating switch subunit is connected with the charging device, an output end of the heating switch subunit is connected with the input end of the inverter output unit, and a control end of the heating switch subunit is electrically connected with the battery management module.
7. The battery pack of claim 1, wherein, The battery management module is in communication connection with the charging device, and the battery management module is further used for controlling the charging device to output an electric energy signal.
8. The battery pack of claim 1, wherein, The second preset temperature is the sum of the first preset temperature and a third preset temperature.
9. The battery pack of claim 1, wherein, The waveform of the pulse signal is a sine wave.
10. An electrically powered device, characterized by The electric device comprises the electric battery pack according to any one of claims 1-9.