A power bank with power shortage wake-up function

Abstract

The utility model discloses a kind of power banks with power shortage wake-up function, including shell, including lithium ion cell and sodium ion cell, lithium ion cell is electrically connected with lithium ion battery circuit board, and the lithium ion battery circuit board is electrically connected with discharge interface;Sodium ion cell is electrically connected with sodium ion battery circuit board, and the sodium ion battery circuit board is electrically connected with wake-up indicator light;Lithium ion cell and sodium ion cell are connected in parallel by lithium ion battery circuit board, sodium ion battery circuit board is achieved.The power bank with power shortage wake-up function of the utility model has the characteristics of long service life, high safety and simple structure.

Description

Technical Field

[0001] This utility model relates to the field of mobile power technology, specifically to a power bank with a power-off wake-up function. Background Technology

[0002] A power bank, also known as a portable power bank, is a portable power supply device primarily used to provide power to electronic devices such as mobile phones and tablets. It typically consists of a casing, battery cells, and a circuit board. Internally, it mainly contains a lithium-ion battery, chosen for its high energy density, high charging efficiency, and long cycle life. When charging, a power bank uses a boost system to convert a low voltage to a higher voltage suitable for the device, thus charging mobile phones and other electronic devices. Due to its small size and portability, it is suitable for daily use and can meet the needs of most electronic devices.

[0003] In existing technology, power banks use lithium-ion cells as the power supply device, which has the following disadvantages in current applications:

[0004] If a lithium-ion battery cell is left in an open-circuit state for an extended period, its capacity will spontaneously decrease, a phenomenon known as self-discharge. Self-discharge not only leads to a reduction in cell capacity and a drop in lithium-ion cell voltage, but also affects battery packing and cycle life.

[0005] If a lithium-ion battery cell is left unattended for an extended period after reaching its lower voltage limit, it will be affected by self-discharge. If the lithium battery is charged with normal current, it will cause the battery to swell, which may further lead to thermal runaway, resulting in fire or explosion.

[0006] For example, lithium batteries in power banks are usually connected in parallel. At the same time, the batteries are protected by the lower limit voltage of the circuit board. If they are left unused for a long time, they will be affected by self-discharge and the battery voltage will drop below the lower limit voltage protection. Due to the lower limit voltage protection setting of the BMS system, the lithium-ion cells will not be able to be recharged, causing the entire power bank to fail. Utility Model Content

[0007] The purpose of this utility model is to provide a power bank with a power bank wake-up function when the battery is low, which has the characteristics of long service life, high safety and simple structure.

[0008] This utility model can be achieved through the following technical solutions:

[0009] This utility model relates to a power bank with a low-power wake-up function, comprising a shell, a lithium-ion battery cell, and a sodium-ion battery cell. The lithium-ion battery cell is electrically connected to a lithium-ion battery circuit board, which is electrically connected to a discharge interface. The sodium-ion battery cell is electrically connected to a sodium-ion battery circuit board, which is electrically connected to a wake-up indicator light. The lithium-ion battery cell and the sodium-ion battery cell are connected in parallel through the lithium-ion battery circuit board and the sodium-ion battery circuit board.

[0010] Furthermore, the wake-up indicator light and discharge interface are located on the end face of the housing.

[0011] Furthermore, the lithium-ion cell is either a cylindrical lithium-ion cell or a pouch-type prismatic lithium-ion cell.

[0012] Furthermore, the sodium-ion battery cell is either a cylindrical sodium-ion battery cell or a pouch-type square sodium-ion battery cell.

[0013] Furthermore, the lithium-ion battery cell is a lithium cobalt oxide battery cell, a lithium iron phosphate battery cell, a lithium manganese oxide battery cell, or a ternary material battery cell.

[0014] Furthermore, the sodium-ion battery cell is a polyanionic material battery cell, a layered oxide material battery cell, or a Prussian blue material battery cell.

[0015] Furthermore, the end face of the housing is also provided with a power indicator light that is electrically connected to the lithium-ion battery circuit board. This power indicator light consists of several LEDs.

[0016] Furthermore, the end face of the casing is also provided with a charging interface that is electrically connected to the lithium-ion battery circuit board.

[0017] Furthermore, the discharge interface is a micro USB interface, a USB interface, or a type-C interface.

[0018] Furthermore, the housing can be a metal housing or a plastic housing.

[0019] This utility model discloses a power bank with a low-battery wake-up function, which has the following beneficial effects:

[0020] First, sodium-ion batteries have a long service life, providing energy for extended periods to wake up lithium-ion batteries even when they are undercharged. This is primarily because sodium-ion batteries can be over-discharged to 0V. Since the negative electrode current collector of a sodium-ion battery is aluminum foil, aluminum remains stable even at 0V during over-discharge, preventing corrosion and dissolution. This effectively avoids battery performance degradation and safety risks caused by current collector dissolution.

[0021] Secondly, it boasts high safety. Sodium-ion batteries often use hard carbon as the negative electrode material. Hard carbon has a disordered internal crystal arrangement, numerous pores, and large interlayer spacing and pore size, resulting in excellent cycle performance and relatively good thermal stability, making it less prone to serious safety issues such as thermal runaway. The sodium-ion battery circuit board provides real-time monitoring to replenish the lithium-ion cells. Real-time replenishment prevents over-discharge of the lithium-ion cells due to self-discharge, which significantly degrades performance. When self-discharge causes the voltage to exceed the lower limit, the copper foil current collector of the lithium-ion cell dissolves (Cu→Cu²⁺), and corrosion products deposit on the separator or electrode surface, further increasing internal resistance. Increased internal resistance leads to increased voltage polarization during charging and discharging, making the battery more likely to reach the cutoff voltage and reducing the actual usable capacity. When the lithium-ion cell experiences severe self-discharge voltage below 2V, the Cu²⁺ generated from the dissolved copper foil may deposit on the positive electrode surface, causing internal metal deposits to pierce the separator and trigger thermal runaway.

[0022] Third, the structure is simple. In the power bank of this utility model, the sodium-ion battery circuit board, lithium-ion battery circuit board, sodium-ion battery cell, and lithium-ion battery cell are all manufactured using existing mature processes. Their electrical connections can be made using conventional wires. The existing power bank shell structure is used to position and electrically connect the sodium-ion battery circuit board, lithium-ion battery circuit board, sodium-ion battery cell, and lithium-ion battery cell, and then connect them to other additional functions. Attached Figure Description

[0023] Appendix Figure 1 This is a schematic diagram of the structure of a power bank with a power-loss wake-up function according to the present invention;

[0024] Appendix Figure 2 This is a schematic diagram showing the electrical connection relationship between the lithium-ion battery cell and the sodium-ion battery cell of a power bank with a power-loss wake-up function.

[0025] The markings in the attached diagram include: 100, casing; 200, cell placement area; 210, lithium-ion cell; 220, sodium-ion cell; 300, circuit board placement area; 310, lithium-ion battery circuit board; 320, lithium-ion battery circuit board; 400, wake-up indicator light; 500, discharge interface; 600, charging interface; 700, power indicator light. Detailed Implementation

[0026] To enable those skilled in the art to better understand the technical solution of this utility model, the product of this utility model will be further described in detail below with reference to the embodiments.

[0027] like Figures 1-2As shown, this utility model relates to a power bank with a low-power wake-up function, including a housing 100. The housing 100 is provided with a cell placement area 200 and a circuit board placement area 300. The cell placement area 200 is provided with lithium-ion cells 210 and sodium-ion cells 220. The circuit board placement area 300 is provided with lithium-ion battery circuit boards 310 and sodium-ion battery circuit boards 320. The lithium-ion cell 210 is electrically connected to the lithium-ion battery circuit board 310, which is electrically connected to a discharge interface 500. The sodium-ion cell 220 is electrically connected to the sodium-ion battery circuit board 320, which is electrically connected to a wake-up indicator light 400. The lithium-ion cell 210 and the sodium-ion cell 220 are connected in parallel through the lithium-ion battery circuit board 310 and the sodium-ion battery circuit board 320.

[0028] like Figure 1 As shown, the wake-up indicator light 400 and the discharge interface 500 are located on the end face of the housing 100.

[0029] In this utility model, there are no special restrictions on the structure of the battery cell. For example, the lithium-ion battery cell can be a cylindrical lithium-ion battery cell or a pouch square lithium-ion battery cell, and the sodium-ion battery cell can be a cylindrical sodium-ion battery cell or a pouch square sodium-ion battery cell.

[0030] In this invention, there are no special restrictions on the type of material for the battery cell. For example, the lithium-ion battery cell can be a lithium cobalt oxide battery cell, a lithium iron phosphate battery cell, a lithium manganese oxide battery cell, or a ternary material battery cell. The sodium-ion battery cell can be a polyanionic material battery cell, a layered oxide material battery cell, or a Prussian blue material battery cell.

[0031] like Figure 1 As shown, in order to achieve visual control of the power level, the end face of the housing 100 is also provided with a power indicator light 700 that is electrically connected to the lithium-ion battery circuit board 310. The power indicator light consists of several LEDs.

[0032] like Figure 1 As shown, to enable convenient charging, the end face of the housing 100 is also provided with a charging interface 600 that is electrically connected to the lithium-ion battery circuit board 310.

[0033] like Figure 1 As shown, the discharge interface can be a micro USB interface, a USB interface, or a type-C interface. Only two types are shown in the figure, but there is no restriction on the specific type.

[0034] In this invention, to ensure processability and aesthetics, the housing can be either a metal or plastic shell. The specific choice can be made according to requirements, with the principle of balancing cost and safety.

[0035] In this invention, when manufacturing power banks of different structural types, lithium-ion cells (cylindrical and pouch cells) are connected in parallel to form the main power supply; sodium-ion cells (cylindrical and pouch cells) are connected in parallel with the lithium-ion cell group after being controlled by a separate circuit board. When powering electrical appliances, the lithium-ion cells provide power. After the lithium-ion battery circuit board detects that the lower limit voltage has been reached and is protected, the power supply to the power bank is disconnected. Due to the polarization of the lithium-ion cells, the voltage of the lithium-ion cells will be higher than the lower limit voltage set by the lithium-ion battery circuit board. If the user does not charge the power bank in time and it is left unused for a long time, the self-discharge voltage of the lithium-ion cells will drop below 3V. After the sodium-ion battery circuit board detects that the lower limit of the lithium-ion battery circuit board has dropped below 3V, it provides a small current to charge the lithium-ion cells and simultaneously activates the alarm wake-up indicator light to remind the user to charge the power bank. When the power bank is charging, the sodium-ion cells are charged simultaneously under the separate control of the sodium-ion battery circuit board.

[0036] In the description of this utility model, it should be understood that terms such as "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0038] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to 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 this utility model according to the specific circumstances.

[0039] The above embodiments are merely specific examples of this utility model, and their descriptions are quite specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of this utility model, and these obvious substitutions all fall within the protection scope of this utility model.

Claims

1. A power bank with a low-power wake-up function, comprising a casing, characterized in that: It includes lithium-ion cells and sodium-ion cells. The lithium-ion cells are electrically connected to a lithium-ion battery circuit board, which is electrically connected to a discharge interface. The sodium-ion cells are electrically connected to a sodium-ion battery circuit board, which is electrically connected to a wake-up indicator light. The lithium-ion cells and sodium-ion cells are connected in parallel through the lithium-ion battery circuit board and the sodium-ion battery circuit board.

2. The power bank with power loss wake-up function according to claim 1, characterized in that: The wake-up indicator and discharge interface are located on the end face of the housing.

3. The power bank with power loss wake-up function according to claim 2, characterized in that: The lithium-ion battery cell is a cylindrical lithium-ion battery cell or a pouch-type square lithium-ion battery cell.

4. The power bank with power loss wake-up function according to claim 3, characterized in that: The sodium-ion battery cell is either a cylindrical sodium-ion battery cell or a pouch-type square sodium-ion battery cell.

5. The power bank with power loss wake-up function according to claim 4, characterized in that: The lithium-ion battery cell is a lithium cobalt oxide battery cell, a lithium iron phosphate battery cell, a lithium manganese oxide battery cell, or a ternary material battery cell.

6. The power bank with power loss wake-up function according to claim 5, characterized in that: The sodium-ion battery cell is a polyanionic material battery cell, a layered oxide material battery cell, or a Prussian blue material battery cell.

7. The power bank with power loss wake-up function according to claim 6, characterized in that: The end face of the housing is also provided with a power indicator light that is electrically connected to the lithium-ion battery circuit board. This power indicator light consists of several LEDs.

8. The power bank with power loss wake-up function according to claim 7, characterized in that: The end face of the casing is also provided with a charging interface that is electrically connected to the lithium-ion battery circuit board.

9. The power bank with power loss wake-up function according to claim 8, characterized in that: The discharge interface can be a microUSB interface, a USB interface, or a type-C interface.

10. The power bank with power loss wake-up function according to claim 9, characterized in that: The casing can be made of metal or plastic.

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