A battery device and a communication apparatus

Abstract

The application discloses a battery device and a communication device. The battery device comprises a battery pack, a switch assembly and a first charge-discharge capacitor. The battery pack comprises a first battery and a second battery connected in series. The switch assembly is used for switching the first charge-discharge capacitor in parallel connection with the first battery or the second battery. The switch assembly and the first charge-discharge capacitor connected with the first battery and the second battery through the switch assembly are arranged in the battery device. When the first charge-discharge capacitor is connected with the battery with higher voltage, the battery can charge the first charge-discharge capacitor. When the first charge-discharge capacitor is connected with the battery with lower voltage, the first charge-discharge capacitor can discharge the battery. Thus, the voltage of the first battery and the second battery in the battery device is balanced, the safety and reliability of the battery device are improved, and the use experience of the battery device is improved.

Description

Technical Field

[0001] This application relates to the field of battery management technology, and in particular to a battery device and a communication device. Background Technology

[0002] With the rapid development of the national communications and electronics industry, battery packs, as the core component for energy storage and supply in handheld terminals and other electronic devices, directly affect the reliability and efficiency of the entire system. Battery packs are typically composed of multiple individual cells connected in series or parallel. However, in actual use (including charging, discharging, and resting), inherent manufacturing differences, uneven aging, and varying self-discharge rates among individual cells inevitably lead to differences in the actual usable capacity and terminal voltage between cells within the battery pack. This voltage imbalance between individual cells significantly affects the overall performance of the battery pack: it not only limits the usable capacity (the weakest link effect), reduces charging and discharging efficiency, and accelerates battery aging, but in severe cases, it can even cause overcharging or over-discharging of individual cells, leading to overheating, expansion, rapid performance degradation, and even thermal runaway (fire, explosion), resulting in equipment damage and serious safety risks.

[0003] Therefore, how to efficiently and reliably achieve balanced control among individual cells within a battery pack, and eliminate or reduce inconsistencies caused by their own characteristics and usage processes, has become a key technical challenge for improving battery pack performance, extending service life, and ensuring safety, and an effective solution is urgently needed. Utility Model Content

[0004] To address the aforementioned technical problems, this application provides a battery device, including a battery pack, a switching assembly, and a first charging / discharging capacitor;

[0005] The battery pack includes a first battery and a second battery connected in series, with the second end of the first battery connected to the first end of the second battery, and the first charging / discharging capacitor connected to the battery pack through the switching assembly.

[0006] Wherein, the first end of the first charging / discharging capacitor is connected to the first end of the first battery through the switching assembly, and the second end of the first charging / discharging capacitor is connected to the first end of the second battery through the switching assembly; or, the first end of the first charging / discharging capacitor is connected to the second end of the first battery through the switching assembly, and the second end of the first charging / discharging capacitor is connected to the second end of the second battery through the switching assembly.

[0007] The switching assembly is used to switch the connection state between the first charge / discharge capacitor and the first and second batteries.

[0008] The battery device further includes a switching circuit, one end of which is connected to a charging power source, and the other end of which is connected to the switching assembly. The switching circuit is used to control the switching time of the switching assembly when receiving a charging signal transmitted by the charging power source.

[0009] The switching circuit includes an energy storage element and a current limiting element. The first end of the energy storage element is connected to the charging power supply, the second end of the energy storage element is connected to the switching assembly, the first end of the current limiting element is connected to the second end of the energy storage element, and the second end of the current limiting element is grounded.

[0010] The battery device further includes a diode, the cathode of which is connected to the connection circuit between the switching circuit and the switching assembly, and the anode of which is grounded.

[0011] The battery device further includes a frequency oscillation circuit, which is connected to the switching circuit and is used to increase the switching frequency of the switching assembly.

[0012] The energy storage element includes a capacitor, the current limiting element includes a resistor, and the switching time of the switching assembly is determined by the capacitance value of the capacitor and the resistance value of the resistor.

[0013] The battery pack further includes at least one third battery, and the battery device further includes at least one second charge / discharge capacitor. The at least one third battery is connected in series with the first battery and the second battery, and the at least one second charge / discharge capacitor is connected in series with the first charge / discharge capacitor. The switching assembly is used to switch the connection state between the first charge / discharge capacitor and the second charge / discharge capacitor and the first battery, the second battery and the at least one third battery, so that at least two adjacent batteries among the first battery, the second battery and the at least one third battery are connected in parallel with the first charge / discharge capacitor and the second charge / discharge capacitor, respectively.

[0014] The battery pack includes a third battery, and the battery device includes a second charge-discharge capacitor. The second terminal of the first charge-discharge capacitor is connected to the first terminal of the second charge-discharge capacitor. The first terminal of the third battery is connected to the second terminal of the second battery.

[0015] The switching assembly includes a first switch, a second switch, and a third switch. The first end of the first switch is connected to the first end of the first charging and discharging capacitor, the first end of the second switch is connected to the second end of the first charging and discharging capacitor, and the first end of the third switch is connected to the second end of the second charging and discharging capacitor.

[0016] The second end of the first switch is connected to the first end of the first battery, the second end of the second switch is connected to the second end of the first battery, and the second end of the third switch is connected to the second end of the second battery; or, the second end of the first switch is connected to the first end of the second battery, the second end of the second switch is connected to the second end of the second battery, and the second end of the third switch is connected to the second end of the third battery.

[0017] To address the aforementioned technical problems, this application also provides a communication device, including a load component and a battery device as described above, wherein the load component is connected to the battery device, and the battery device is used to supply power to the load component to drive the load component to operate.

[0018] The communication device further includes a charging power supply, which is connected to the battery pack and the switching circuit of the battery device. The charging power supply is used to charge the battery pack and outputs a charging signal to the switching circuit while charging the battery pack.

[0019] The beneficial effects of this application are as follows: Unlike existing technologies, the battery device provided in this application includes a battery pack, a switching assembly, and a first charging / discharging capacitor. The battery pack includes a first battery and a second battery connected in series. The first charging / discharging capacitor is connected to the battery pack via the switching assembly. Specifically, the first terminal of the first charging / discharging capacitor is connected to the first terminal of the first battery via the switching assembly, and the second terminal of the first charging / discharging capacitor is connected to the first terminal of the second battery via the switching assembly; alternatively, the first terminal of the first charging / discharging capacitor is connected to the second terminal of the first battery via the switching assembly, and the second terminal of the first charging / discharging capacitor is connected to the second terminal of the second battery via the switching assembly. The switching assembly is used to switch the connection state between the first charging / discharging capacitor and the first and second batteries. By setting a switching assembly and a first charging / discharging capacitor connected to the first and second batteries via the switching assembly in the battery device, when the first charging / discharging capacitor is connected to a battery with a higher voltage, the battery can charge the first charging / discharging capacitor; and when the first charging / discharging capacitor is connected to a battery with a lower voltage, the first charging / discharging capacitor can discharge the battery. This achieves voltage balance between the first and second batteries in the battery device, improves the safety and reliability of the battery device, and enhances the user experience. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] in:

[0022] Figure 1 This is a schematic diagram of the structure of the battery device according to the first embodiment of this application;

[0023] Figure 2 This is a schematic diagram of the structure of the second embodiment of the battery device of this application;

[0024] Figure 3 This is a schematic diagram of the structure of the battery device according to the third embodiment of this application;

[0025] Figure 4 This is a schematic diagram of the structure of the fourth embodiment of the battery device of this application;

[0026] Figure 5 This is a structural schematic diagram of the fifth embodiment of the battery device of this application.

[0027] Reference numerals: Battery device 1; Battery pack 11; First battery 111; Second battery 112; Third battery 113; Switch assembly 12; First switch K1; Second switch K2; First charge / discharge capacitor C1; Switching circuit 13; Capacitor C2; Resistor R; Diode D; Second charge / discharge capacitor C3. Detailed Implementation

[0028] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0029] In the following description, specific details such as particular system architectures, interfaces, and technologies are presented for illustrative purposes rather than for limiting purposes, in order to provide a thorough understanding of this application.

[0030] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0031] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Additionally, the character " / " generally indicates that the preceding and following related objects are in an "or" relationship. Furthermore, "many" in this application means two or more. Moreover, the term "at least one" in this application means any combination of at least two of any one or more of a plurality of objects. For example, including at least one of A, B, and C can mean including any one or more elements selected from the set consisting of A, B, and C. Furthermore, the terms "first," "second," and "third" in this application are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features.

[0032] In the field of battery pack voltage balancing technology, existing solutions are mainly divided into two categories: passive balancing and active balancing. Active balancing technology, due to its ability to transfer energy rather than simply dissipate it, offers superior efficiency and performance, but its implementation is more complex. Currently disclosed typical active balancing methods include:

[0033] The first method is an active balancing technology for lithium battery packs based on a boost converter circuit and a supercapacitor. Its core lies in combining inductors and capacitors to achieve energy transfer, allowing charge transfer between any two individual cells within the battery pack, thereby achieving voltage balance. This method reportedly achieves an overall efficiency of approximately 84% during the balancing process and features flexible control and relatively high charge transfer efficiency, making it suitable for low-current discharge balancing scenarios in large-capacity series-connected lithium battery packs.

[0034] The second method utilizes series-connected battery cells and strategies to address inconsistencies, primarily involving the application of a common bridging capacitor. The specific process is as follows: first, the battery cells are detected and sorted according to their voltage; then, the cell with the highest voltage charges the bridging capacitor; subsequently, this capacitor is connected to the cell with the lowest voltage, using its stored energy to charge it, repeating this cycle to achieve charge balance. The advantage of this method is that it avoids direct energy waste, improves charging efficiency to some extent, and simplifies the structure of the balancing circuit.

[0035] However, both of the aforementioned existing active equalization technologies have significant drawbacks: First, both require complex voltage sampling circuits (for detecting individual cell voltages) and dedicated control chips (such as MCUs or dedicated ICs) to execute precise detection and control logic; second, to achieve energy transfer functions (such as boost conversion, switching, and capacitor charging / discharging path switching), their circuit designs are relatively complex, involving numerous components; third, the complexity of the circuits inevitably leads to higher system costs; and finally, the complex switching actions, the operation of the control chip itself, and the inherent power consumption of topologies such as boost converters collectively result in high overall system power loss, i.e., high circuit power consumption. These disadvantages (high cost, high power consumption, and high complexity) limit the widespread application of such advanced equalization technologies in cost-sensitive or power-constrained scenarios.

[0036] To address the aforementioned technical problems, this application provides a battery device that achieves a low-cost, low-power, and easily integrated battery balancing solution. Please refer to [link / reference]. Figure 1 , Figure 1 This is a schematic diagram of the structure of the first embodiment of the battery device of this application. The battery device 1 provided in this embodiment includes a battery pack 11, a switching assembly 12, and a first charging / discharging capacitor C1.

[0037] The battery pack 11 includes a first battery 111 and a second battery 112 connected in series. The second end of the first battery 111 can be connected to the first end of the second battery 112. The first charging and discharging capacitor C1 is connected to the battery pack 11 through the switching assembly 12.

[0038] Please refer to the following: Figure 1 and Figure 2 , Figure 2 This is a schematic diagram of the structure of the second embodiment of the battery device of this application. Figure 1 As shown, the first terminal of the first charging / discharging capacitor C1 is connected to the first terminal of the first battery 111 via the switching assembly 12, and the second terminal of the first charging / discharging capacitor C1 is connected to the second terminal of the second battery 112 via the switching assembly 12, or, as... Figure 2 As shown, the first terminal of the first charging / discharging capacitor C1 is connected to the second terminal of the first battery 111 through the switching assembly 12, and the second terminal of the first charging / discharging capacitor C1 is connected to the second terminal of the second battery 112 through the switching assembly 12.

[0039] The switching assembly 12 is used to switch the connection state between the first charging / discharging capacitor C1 and the first battery 111 and the second battery 112.

[0040] Specifically, such as Figures 1-2As shown, the switch assembly 12 may include a first switch K1 and a second switch K2. The first switch K1 and the second switch K2 may be single-pole double-throw switches, which can switch to connect the first charging and discharging capacitor C1 in parallel with the first battery 111, or switch to connect the first charging and discharging capacitor C1 in parallel with the second battery 112.

[0041] For ease of description, the first battery 111 is defined as a battery with a higher voltage, and the second battery 112 is defined as a battery with a lower voltage.

[0042] When the switching assembly 12 switches to connect the first charging / discharging capacitor C1 in parallel with the first battery 111, the first battery 111 charges the first charging / discharging capacitor C1, and the voltage of the first battery 111 decreases until the voltage of the first charging / discharging capacitor C1 equals the voltage of the first battery 111. Then, the switching assembly 12 can switch to connect the first charging / discharging capacitor C1 in parallel with the second battery 112. At this time, the voltage of the first charging / discharging capacitor C1 is higher than the voltage of the second battery 112, and the first charging / discharging capacitor C1 discharges into the second battery 112 until the voltage of the first charging / discharging capacitor C1 equals the voltage of the second battery 112.

[0043] Next, the switching assembly 12 can switch to connect the first charging / discharging capacitor C1 in parallel with the first battery 111, and then switch to connect the first charging / discharging capacitor C1 in parallel with the second battery 112. Through the cooperation of the first charging / discharging capacitor C1 and the switching assembly 12, the voltage of the first battery 111 and the voltage of the second battery 112 are gradually balanced, so that the voltage of the first battery 111 is equal to the voltage of the second battery 112.

[0044] In one embodiment, after the switch assembly 12 switches to a parallel connection between the first charging / discharging capacitor C1 and the first battery 111, a preset time is elapsed before the switch assembly 12 switches to a parallel connection between the first charging / discharging capacitor C1 and the second battery 112. After another preset time, the switch assembly 12 switches back to a parallel connection between the first charging / discharging capacitor C1 and the first battery 111. The preset time can be determined by the user, and this application does not impose any restrictions on it.

[0045] In another embodiment, if the second battery 112 is a battery with a higher voltage and the first battery 111 is a battery with a lower voltage, the process of switching the switch assembly 12 to balance the voltage of the first battery 111 and the voltage of the second battery 112 is the same as the above-described balancing process, and will not be repeated here.

[0046] In other embodiments, the operating current of the switching component 12 can be in the nA range, reducing the power consumption of the switching component 12 and thus reducing the overall power consumption of the battery device 1. This power consumption is much lower than that of a battery using an MCU solution. Furthermore, the number of internal components of the battery device 1 provided in this embodiment is much smaller than that of the battery using a main control chip solution. The battery device 1 provided in this embodiment has a single internal component and high reliability.

[0047] In summary, the battery device 1 provided in this application embodiment achieves voltage balancing of individual cells in the battery pack 11 by using the cooperation of the first charging / discharging capacitor C1 and the switching component 12. This eliminates the complex sampling circuit of existing solutions, and eliminates the need for a main control chip control system and control strategy, as well as the need to distinguish internal voltage differences within the batteries. Active balancing of the battery pack 11 can be achieved each time the battery is charged using the switching component 12 and the first charging / discharging capacitor C1. Over time, this balances the internal voltage of the battery device 1, protects the battery device 1, extends its service life, and saves on component costs.

[0048] It is understood that the capacitance value of the first charge / discharge capacitor C1 can be determined by the capacity of the individual cells in the battery pack 11. That is, in the battery device 1 provided in this application embodiment, for individual cells with different capacities, only the capacitance value of the first charge / discharge capacitor C1 needs to be changed to achieve the effect of battery voltage balancing in the battery pack 11, which is highly versatile. Moreover, active balancing can extend battery life, reduce safety risks, reduce overcharging and over-discharging of individual cells, avoid battery overheating, swelling, or even fire, and improve the safety and reliability of the battery device 1.

[0049] Furthermore, without the need for complex components such as an MCU, the first charging / discharging capacitor C1 can be installed in the battery device 1 and shipped with it. Thus, during the user's use of the battery device 1, the first charging / discharging capacitor C1 can still cooperate with the switching component 12 to achieve active voltage balancing of the batteries in the battery pack 11. Compared with existing methods that only perform voltage balancing once before the battery device leaves the factory and cannot achieve voltage balancing after leaving the factory, the battery device 1 provided in this application embodiment can perform active voltage balancing of the batteries immediately when the user charges the battery pack 11, extending the service life of the battery device 1 and improving the user's experience with the battery device 1.

[0050] Optionally, the battery device 1 further includes a switching circuit 13, one end of which is connected to the charging power supply Vin, and the other end of which is connected to the switching assembly 12. The switching circuit 13 is used to control the switching time of the switching assembly 12 when receiving the charging signal transmitted by the charging power supply Vin.

[0051] The charging power supply Vin can charge the battery pack 11. While charging the battery pack 11, the charging power supply Vin can transmit a charging signal to the switching circuit 13. When the switching circuit 13 receives the charging signal, it controls the switching time of the switching component 12 so that the switching component 12 switches periodically so that the first charging and discharging capacitor C1 is connected in parallel with the first battery 111, or the first charging and discharging capacitor C1 is connected in parallel with the second battery 112, so as to balance the voltage of the individual cells in the battery pack 11.

[0052] Optionally, the switching circuit 13 may include an energy storage element and a current limiting element, wherein the first end of the energy storage element is connected to the charging power supply Vin, the second end of the energy storage element is connected to the switching assembly, the first end of the current limiting element is connected to the second end of the energy storage element, and the second end of the current limiting element is grounded.

[0053] The energy storage element stores electrical energy and forms a controlled voltage transient response at the connection node between the charging power supply Vin and the switching assembly 12. A current-limiting element is connected at one end to the node between the energy storage element and the switching assembly 12 (defined as the monitoring node). This element primarily provides a precisely controlled current path, limits the rate of charge and discharge current flowing through the node, and sets a time reference for the voltage transient response. The energy storage element and the current-limiting element work together to establish a predictable voltage evolution characteristic (such as exponential charge / discharge characteristics) at the monitoring node. The delay time of this voltage change is used as a control signal to trigger the state switching of the switching assembly 12.

[0054] The switching time of the switch assembly 12 can be defined as the time elapsed from after the switch assembly 12 switches to connect the first charging / discharging capacitor C1 in parallel with the first battery 111 until the switch assembly 12 starts switching to connect the first charging / discharging capacitor C1 in parallel with the second battery 112, which is the preset time mentioned above.

[0055] In one embodiment, the energy storage element can be a capacitor C2, and the current limiting element can be a resistor R. Then the switching circuit 13 can be an RC charging and discharging circuit, and the switching time of the switching component 12 is determined by the capacitance value of capacitor C2 and the resistance value of resistor R.

[0056] In this configuration, capacitor C2, acting as an energy storage element, is connected in series between the power supply Vin and the switching component 12. Resistor R, acting as a current-limiting element, is connected between the second terminal of capacitor C2 and ground. Capacitor C2 and resistor R form a time constant circuit. During charging, capacitor C2 charges, causing the voltage at the monitoring node mentioned earlier to rise exponentially. The time required for this voltage to reach a preset threshold, i.e., the delay time (switching time) from when the switching component 12 remains in its current state to when it begins to switch, is mainly determined by the capacitance of capacitor C2 and the resistance of resistor R (approximately satisfying τ∝R*C, where τ is the switching time, R is the resistance of resistor R, and C is the capacitance of capacitor C2). The switching time of the switching component 12 can be directly controlled by setting the values ​​of resistor R and capacitor C2.

[0057] In summary, by cooperating with the energy storage element and the current limiting element in the switching circuit 13, the switching time of the switching assembly 12 is controlled, the orderliness of the switching of the switching assembly 12 is improved, and the operational reliability of the battery device 1 is improved.

[0058] Understandably, when the switching circuit 13 does not receive a charging signal from the charging power supply Vin, that is, when the battery pack 11 is not in a charging state, the switching circuit 13 does not switch the connection state of the switching component 12. At this time, the switching component 12 and the battery pack 11 are in an open circuit state, that is, the first charging / discharging capacitor C1 and the battery pack 11 are in an open circuit state. Therefore, no current loop is formed between the first charging / discharging capacitor C1 and the battery pack 11, which improves the safety of the individual cells in the battery pack 11 and avoids the situation where the first charging / discharging capacitor C1 discharges to any individual cell in the battery pack 11. At the same time, since the switching component 12 forms a high resistance between the first charging / discharging capacitor C1 and the battery pack 11, there is no leakage current inside the battery device 1, thereby reducing the static power consumption of the battery device 1.

[0059] Optionally, please refer to Figure 3 The battery device 1 provided in this application embodiment also includes a diode D. The cathode of the diode D is connected to the connection circuit between the switching circuit 13 and the switching component 12, and the anode of the diode D is grounded.

[0060] In this embodiment, diode D is used to maintain a constant voltage across the switching circuit 13, preventing potential transient negative voltage spikes from damaging sensitive components in the switching circuit 13 and affecting the operational stability of the switching circuit 13. This embodiment protects the switching circuit 13 by setting diode D, thereby improving the operational reliability of the switching circuit 13 and the reliability of the battery device 1.

[0061] Optionally, the battery device 1 also includes a frequency oscillation circuit (not shown), which is connected to the switching circuit 13 and is used to increase the switching frequency of the switching assembly 12.

[0062] In cases where the capacity of the first charging / discharging capacitor C1 is too large, or where battery voltage balancing is slow, a frequency oscillation circuit can be added to the battery device 1 and connected to the switching circuit 13 to increase the switching frequency of the switching component 12 during charging, thereby achieving the goal of starting battery voltage balancing.

[0063] Alternatively, please continue reading Figure 4 , Figure 4 This is a schematic diagram of the structure of the fourth embodiment of the battery device of this application. The battery pack 11 also includes at least one third battery 113, and the battery device 1 also includes at least one second charge-discharge capacitor C3 (it can be understood that the number of third batteries 113 is equal to the number of second charge-discharge capacitors C3, so that in the battery device 1, the number of individual batteries is one more than the number of charge-discharge capacitors). At least one third battery 113 is connected in series with the first battery 111 and the second battery 112, and at least one second charge-discharge capacitor C3 is connected in series with the first charge-discharge capacitor C1. The switching assembly 12 is used to switch the connection state between the first charge-discharge capacitor C1 and the second capacitor C2 and the first battery 111, the second battery 112 and at least one third battery 113, so that at least two adjacent batteries among the first battery 111, the second battery 112 and the third battery 113 are connected in parallel with the first charge-discharge capacitor C1 and the second charge-discharge capacitor C3 respectively.

[0064] Specifically, when the first charge / discharge capacitor C1 is connected in parallel with a battery with a higher voltage, the battery can charge the first charge / discharge capacitor C1, reducing the voltage of the higher-voltage battery. When the first charge / discharge capacitor C1 is connected in parallel with a battery with a lower voltage, the first charge / discharge capacitor C1 discharges to the battery, increasing the voltage of the lower-voltage battery. Similarly, when the second charge / discharge capacitor C3 is connected in parallel with a battery with a higher voltage, the battery also charges the second charge / discharge capacitor C3, reducing the voltage of the higher-voltage battery. When the second charge / discharge capacitor C3 is connected in parallel with a battery with a lower voltage, the second charge / discharge capacitor C3 discharges to the battery, increasing the voltage of the lower-voltage battery. By periodically switching between connecting the first charge / discharge capacitor C1 and the second charge / discharge capacitor C3 in parallel with adjacent batteries, voltage balance among individual batteries is achieved.

[0065] In one embodiment, the battery pack 11 may include a third battery 113, the battery device 1 includes a second charge / discharge capacitor C3, the second end of the first charge / discharge capacitor C1 is connected to the first end of the second charge / discharge capacitor C3, and the switch assembly 12 includes a first switch K1, a second switch K2 and a third switch K3, the first end of the first switch K1 is connected to the first end of the first charge / discharge capacitor C1, the first end of the second switch K2 is connected to the second end of the first charge / discharge capacitor C1, and the first end of the third switch K3 is connected to the second end of the second charge / discharge capacitor C3.

[0066] The second end of the first switch K1 is connected to the first end of the first battery 111, the second end of the second switch K2 is connected to the second end of the first battery 111, and the second end of the third switch K3 is connected to the second end of the second battery 112; or, the second end of the first switch K1 is connected to the first end of the second battery 112, the second end of the second switch K2 is connected to the second end of the second battery 112, and the second end of the third switch K3 is connected to the second end of the third battery 113.

[0067] Please refer to the following: Figures 4-5 , Figure 4 This is a schematic diagram showing the structure where the switching assembly 12 switches to a configuration where the first charging / discharging capacitor C1 is connected in parallel with the first battery 111, and the second charging / discharging capacitor C3 is connected in parallel with the second battery 112. Figure 5 This is a schematic diagram showing the structure where the switching assembly 12 is switched so that the first charging / discharging capacitor C1 is connected in parallel with the second battery 112, and the second charging / discharging capacitor C3 is connected in parallel with the third battery 113. The first switch K1, the second switch K2, and the third switch K3 can all be single-pole double-throw switches. Therefore, the switching assembly 12 can first switch so that the second terminal of the first switch K1 is connected to the first terminal of the first battery 111, the second terminal of the second switch K2 is connected to the second terminal of the first battery 111, and the second terminal of the third switch K3 is connected to the second terminal of the second battery 112. This results in the first charging / discharging capacitor C1 being connected in parallel with the first battery 111, and the second charging / discharging capacitor C3 being connected in parallel with the second battery 112. The voltage of the first charging / discharging capacitor C1 is equal to the voltage of the first battery 111, and the voltage of the second charging / discharging capacitor C3 is equal to the voltage of the second battery 112.

[0068] Then, the switch assembly 12 can be switched so that the second end of the first switch K1 is connected to the first end of the second battery 112, the second end of the second switch K2 is connected to the second end of the second battery 112, the second end of the third switch K3 is connected to the third battery 113, the first charging / discharging capacitor C1 is connected in parallel with the second battery 112, and the second charging / discharging capacitor C3 is connected in parallel with the third battery 113. At this time, the voltage of the first charging / discharging capacitor C1 can be equal to the voltage of the second battery 112. That is, if the voltage of the first battery 111 is greater than the voltage of the second battery 112, the first charging / discharging capacitor C1 discharges to the second battery 112 to increase the voltage of the second battery 112. If the voltage of the first battery 111 is less than the voltage of the second battery 112, the second battery 112 charges the first charging / discharging capacitor C1, and the voltage of the second battery 112 decreases. Furthermore, the voltage of the second charging / discharging capacitor C3 can be equal to the voltage of the third battery 113. Therefore, if the voltage of the second battery 112 is greater than the voltage of the third battery 113, the second charging / discharging capacitor C3 discharges the third battery 113, increasing its voltage. If the voltage of the second battery 112 is less than the voltage of the third battery 113, the third battery 113 charges the second charging / discharging capacitor C3, decreasing its voltage.

[0069] Similarly, the first switch K1, the second switch K2, and the third switch K3 can be periodically switched to connect to different batteries, so that the first charging / discharging capacitor C1 and the second charging / discharging capacitor C3 are connected in parallel with different batteries. If the voltage of the battery connected in parallel with the first charging / discharging capacitor C1 before the switch is greater than the voltage of the battery connected in parallel with the first charging / discharging capacitor C1 after the switch, then the first charging / discharging capacitor C1 discharges, increasing the voltage of the battery connected in parallel at this time. If the voltage of the battery connected in parallel with the first charging / discharging capacitor C1 before the switch is less than the voltage of the battery connected in parallel with the first charging / discharging capacitor C1 after the switch, then the battery charges the first charging / discharging capacitor C1. The first charging / discharging capacitor C1 can carry electrical energy and charge the battery with the lower voltage as the switch assembly 12 switches.

[0070] Meanwhile, if the voltage of the battery connected in parallel with the second charging / discharging capacitor C3 before the switch is greater than the voltage of the battery connected in parallel with the second charging / discharging capacitor C3 after the switch, then the second charging / discharging capacitor C3 discharges to increase the voltage of the battery connected in parallel at this time; and if the voltage of the battery connected in parallel with the second charging / discharging capacitor C3 before the switch is less than the voltage of the battery connected in parallel with the second charging / discharging capacitor C3 after the switch, then the battery charges the second charging / discharging capacitor C3, and the second charging / discharging capacitor C3 can carry electrical energy to charge the battery with the lower voltage as the switching assembly 12 switches.

[0071] Through the cooperation of the first charging and discharging capacitor C1, the second charging and discharging capacitor C3 and the switching assembly 12, active voltage balancing among multiple individual cells in the battery pack 11 can be achieved, thereby improving the reliability and safety of the battery device 1.

[0072] In summary, in the battery device 1 provided in this application embodiment, by setting a switching component 12 and a charging and discharging capacitor connected in parallel with different individual batteries through the switching component 12, when the charging and discharging capacitor is connected to a battery with a higher voltage, the battery can charge the charging and discharging capacitor, and when the charging and discharging capacitor is connected to a battery with a lower voltage, the charging and discharging capacitor can discharge the battery. This achieves voltage balance of different individual batteries in the battery device 1, improves the safety and reliability of the battery device 1, and enhances the user's experience with the battery device 1.

[0073] This application also provides a communication device (not shown), including a load component and a battery device 1. The load component can be connected to the battery device 1, and the battery device 1 is used to supply power to the load component to drive the load component to operate.

[0074] Optionally, the communication device also includes a charging power supply, which can be considered to be the charging power supply Vin mentioned above. The charging power supply is connected to the battery pack 11 of the battery device 1 and the switching circuit 13 respectively, and is used to charge the battery pack 11. When charging the battery pack 11, it outputs a charging signal to the switching circuit 13 so that the switching circuit 13 controls the switching component 12 to swing. The switching component 12 cooperates with the first charging and discharging capacitor C1 to realize the voltage balance of different batteries in the battery pack 11. During the charging process of the battery pack 11, the voltage between different individual batteries in the battery pack 11 is actively balanced, avoiding overcharging or over-discharging of individual batteries and improving the reliability and safety of the communication device.

[0075] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A battery device, characterized in that, Includes battery pack, switching assembly and first charge / discharge capacitor; The battery pack includes a first battery and a second battery connected in series, with the second end of the first battery connected to the first end of the second battery, and the first charging / discharging capacitor connected to the battery pack through the switching assembly. Wherein, the first end of the first charging / discharging capacitor is connected to the first end of the first battery through the switching assembly, and the second end of the first charging / discharging capacitor is connected to the first end of the second battery through the switching assembly; or, the first end of the first charging / discharging capacitor is connected to the second end of the first battery through the switching assembly, and the second end of the first charging / discharging capacitor is connected to the second end of the second battery through the switching assembly. The switching assembly is used to switch the connection state between the first charge / discharge capacitor and the first and second batteries.

2. The battery device according to claim 1, characterized in that, The battery device further includes a switching circuit, one end of which is connected to a charging power source and the other end of which is connected to the switching assembly. The switching circuit is used to control the switching time of the switching assembly when receiving a charging signal transmitted by the charging power source.

3. The battery device according to claim 2, characterized in that, The switching circuit includes an energy storage element and a current limiting element. The first end of the energy storage element is connected to the charging power supply, the second end of the energy storage element is connected to the switching assembly, the first end of the current limiting element is connected to the second end of the energy storage element, and the second end of the current limiting element is grounded.

4. The battery device according to claim 2, characterized in that, The battery device also includes a diode, the cathode of which is connected to the connection circuit between the switching circuit and the switching assembly, and the anode of which is grounded.

5. The battery device according to claim 2, characterized in that, The battery device further includes a frequency oscillation circuit, which is connected to the switching circuit and is used to increase the switching frequency of the switching assembly.

6. The battery device according to claim 3, characterized in that, The energy storage element includes a capacitor, the current limiting element includes a resistor, and the switching time of the switching assembly is determined by the capacitance value of the capacitor and the resistance value of the resistor.

7. The battery device according to claim 1, characterized in that, The battery pack further includes at least one third battery, and the battery device further includes at least one second charge-discharge capacitor. The at least one third battery is connected in series with the first battery and the second battery, and the at least one second charge-discharge capacitor is connected in series with the first charge-discharge capacitor. The switching assembly is used to switch the connection state between the first charge-discharge capacitor and the second charge-discharge capacitor and the first battery, the second battery and the at least one third battery, so that at least two adjacent batteries among the first battery, the second battery and the at least one third battery are connected in parallel with the first charge-discharge capacitor and the second charge-discharge capacitor, respectively.

8. The battery device according to claim 7, characterized in that, The battery pack includes a third battery, and the battery device includes a second charge-discharge capacitor, with the second terminal of the first charge-discharge capacitor connected to the first terminal of the second charge-discharge capacitor; the first terminal of the third battery is connected to the second terminal of the second battery. The switching assembly includes a first switch, a second switch, and a third switch. The first end of the first switch is connected to the first end of the first charging and discharging capacitor, the first end of the second switch is connected to the second end of the first charging and discharging capacitor, and the first end of the third switch is connected to the second end of the second charging and discharging capacitor. The second end of the first switch is connected to the first end of the first battery, the second end of the second switch is connected to the second end of the first battery, and the second end of the third switch is connected to the second end of the second battery; or, the second end of the first switch is connected to the first end of the second battery, the second end of the second switch is connected to the second end of the second battery, and the second end of the third switch is connected to the second end of the third battery.

9. A communication device, characterized in that, It includes a load component and a battery device as described in any one of claims 1-8, wherein the load component is connected to the battery device, and the battery device is used to supply power to the load component to drive the load component to operate.

10. The communication device according to claim 9, characterized in that, The communication device also includes a charging power supply, which is connected to the battery pack and the switching circuit of the battery device. The charging power supply is used to charge the battery pack and outputs a charging signal to the switching circuit when charging the battery pack.

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