Battery assembly, charging and discharging method and device thereof, and mobile terminal

Abstract

The present disclosure relates to a battery assembly and a charging and discharging method and a charging and discharging device, and a mobile terminal. The battery assembly includes a battery body; a battery protection board, which is arranged at one end of the battery body and electrically connected to the output end of the electrode of the battery body; a first flexible circuit board and a second flexible circuit board, which are electrically connected to the battery protection board in parallel; and a path selection module, which selects at least one of the first flexible circuit board and the second flexible circuit board as a current conduction path to charge and discharge the battery body according to at least one of the charging current and the battery temperature. The present disclosure can reduce the charging temperature rise during high current charging, shorten the charging time, increase the battery discharge capacity during low temperature discharge, and improve the user experience.

Description

Technical Field

[0001] The present disclosure relates to the field of battery technology, and in particular to a battery assembly, a charging and discharging method and a charging and discharging device thereof, and a mobile terminal. Background Art

[0002] As the configuration of mobile terminals such as mobile phones and tablets becomes higher and higher, the power consumption is increasing, and the requirements for battery capacity and battery charging and discharging speed are also increasing. As a result, fast charging methods have emerged. The charging current during fast charging can reach 6A, 8A, or even higher. However, as the charging current increases, the heat generated by the battery will inevitably increase accordingly. When the battery temperature rises to a certain temperature, it is necessary to reduce the charging speed to prevent the battery from overheating, resulting in a decrease in user experience. Summary of the invention

[0003] In order to overcome the problems existing in the related art, the present disclosure provides a battery assembly and a charging and discharging method and a charging and discharging device, and a mobile terminal.

[0004] According to a first aspect of an embodiment of the present disclosure, there is provided a battery assembly, comprising a battery body; a battery protection board, which is arranged at one end of the battery body and electrically connected to the output end of the electrode of the battery body; a first flexible circuit board and a second flexible circuit board, which are electrically connected to the battery protection board in parallel; and a path selection module, which selects at least one of the first flexible circuit board and the second flexible circuit board as a current conduction path to charge and discharge the battery body according to at least one of the charging current and the battery temperature.

[0005] In one embodiment of the present disclosure, the first flexible circuit board is attached to one end of the battery protection board along the length direction of the battery protection board; and the second flexible circuit board is attached to one surface of the battery body.

[0006] In one embodiment of the present disclosure, the path selection module is configured as follows: when the charging current is greater than a preset current, the path selection module selects the first flexible circuit board and the second flexible circuit board as current conduction paths to charge the battery body at the same time; when the charging current is less than or equal to the preset current, the path selection module selects the first flexible circuit board as the current conduction path to charge the battery body.

[0007] In one embodiment of the present disclosure, when the charging current is greater than a preset current, the path selection module selects the first flexible circuit board and the second flexible circuit board as current conduction paths to charge the battery body, including: the first flexible circuit board and the second flexible circuit board evenly share the charging current for charging.

[0008] In one embodiment of the present disclosure, the battery assembly further includes a temperature sensor, which detects the battery temperature and sends the battery temperature to the path selection module.

[0009] In one embodiment of the present disclosure, the path selection module is further configured as follows: when the temperature detected by the temperature sensor is greater than or equal to a preset temperature, the path selection module selects the first flexible circuit board as the current conduction path to discharge the battery body; when the temperature detected by the temperature sensor is less than the preset temperature, the path selection module selects the second flexible circuit board as the current conduction path to discharge the battery body.

[0010] In one embodiment of the present disclosure, the area of ​​the first flexible circuit board is less than or equal to 25% of the area of ​​the battery protection board; the area of ​​the second flexible circuit board occupies 50% to 90% of the area of ​​the surface of the battery body.

[0011] In one embodiment of the present disclosure, a groove is provided on the surface of the battery body, and the second flexible circuit board is attached to the groove.

[0012] In one embodiment of the present disclosure, a step portion is provided at one end of the battery body, and the battery protection plate is fixed on the step portion.

[0013] In one embodiment of the present disclosure, a step portion is provided at one end of the battery body, and the temperature sensor is provided on the step portion.

[0014] In one embodiment of the present disclosure, the path selection module is integrated on the battery protection board.

[0015] According to a second aspect of an embodiment of the present disclosure, a mobile terminal is provided, comprising a battery assembly, the battery assembly being any one of the battery assemblies described above; and a terminal mainboard, the battery assembly being electrically connected to a charge and discharge module of the terminal mainboard.

[0016] According to a third aspect of an embodiment of the present disclosure, a method for charging and discharging a battery assembly is provided, comprising: obtaining at least one of a charging current and a battery temperature of the battery assembly; and selecting at least one of a first flexible circuit board and a second flexible circuit board provided in the battery assembly as a current conduction path to charge and discharge the battery body according to at least one of the charging current and the battery temperature.

[0017] In one embodiment of the present disclosure, according to at least one of the charging current and the battery temperature, at least one of the first flexible circuit board and the second flexible circuit board provided in the battery assembly is selected as a current conduction path to charge and discharge the battery body, including: when the charging current is greater than a preset current, the first flexible circuit board and the second flexible circuit board are selected as current conduction paths to charge the battery body at the same time; when the charging current is less than or equal to the preset current, the first flexible circuit board is selected as the current conduction path to charge the battery body.

[0018] In one embodiment of the present disclosure, when the charging current is greater than a preset current, the first flexible circuit board and the second flexible circuit board are selected as current conduction paths to charge the battery body, including: the first flexible circuit board and the second flexible circuit board evenly share the charging current for charging.

[0019] In one embodiment of the present disclosure, the battery temperature is detected by a temperature sensor; when the detected battery temperature is greater than or equal to a preset temperature, the first flexible circuit board is selected as a current conduction path to discharge the battery body; when the detected battery temperature is less than the preset temperature, the second flexible circuit board is selected as a current conduction path to discharge the battery body.

[0020] According to a fourth aspect of an embodiment of the present disclosure, a charging and discharging device for a battery assembly is provided, comprising an acquisition module for acquiring at least one of a charging current and a battery temperature of the battery assembly; and a path selection module for selecting at least one of a first flexible circuit board and a second flexible circuit board provided in the battery assembly as a current conduction path for charging and discharging a battery body according to at least one of the charging current and the battery temperature.

[0021] In one embodiment of the present disclosure, when the charging current is greater than a preset current, the path selection module selects the first flexible circuit board and the second flexible circuit board as current conduction paths to charge the battery body at the same time; when the charging current is less than or equal to the preset current, the path selection module selects the first flexible circuit board as the current conduction path to charge the battery body.

[0022] In one embodiment of the present disclosure, when the charging current is greater than a preset current, the first flexible circuit board and the second flexible circuit board evenly share the charging current for charging.

[0023] In one embodiment of the present disclosure, the battery temperature is detected by a temperature sensor; when the detected battery temperature is greater than or equal to a preset temperature, the path selection module selects the first flexible circuit board as a current conduction path to discharge the battery body; when the detected battery temperature is less than the preset temperature, the path selection module selects the second flexible circuit board as a current conduction path to discharge the battery body. The technical solution provided by the embodiment of the present disclosure may include the following beneficial effects: by setting the first flexible circuit board and the second flexible circuit board and the path selection module, and by the path selection module, according to at least one of the charging current and the battery temperature, at least one of the first flexible circuit board and the second flexible circuit board is selected as the current conduction path to charge and discharge the battery body, the charging temperature rise during high current charging can be reduced, the charging time can be shortened, and the battery discharge capacity during low temperature discharge can be increased, which improves the user experience, and solves the problems of reduced charging speed and extended charging time caused by only using one flexible circuit board as the current conduction path in the related art, and the problem of reduced battery discharge capacity at low temperature.

[0024] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0026] Figure 1 is a schematic diagram of a battery assembly according to an exemplary embodiment.

[0027] Figure 2 It is a schematic diagram of a mobile terminal according to an exemplary embodiment.

[0028] Figure 3 The figure is a flow chart of a method for charging a battery assembly according to an exemplary embodiment.

[0029] Figure 4 The figure is a flow chart of a method for charging a battery assembly according to an exemplary embodiment.

[0030] Figure 5 The figure is a flow chart of a method for charging a battery assembly according to an exemplary embodiment.

[0031] Figure 6 The figure is a block diagram of a charging and discharging device of a battery assembly according to an exemplary embodiment. DETAILED DESCRIPTION

[0032] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0033] Mobile terminals such as mobile phones and tablet computers generally include a terminal motherboard and a battery, and the battery is usually a built-in battery. The built-in battery generally includes a battery body and a battery protection board. The battery body has two electrode output terminals, a positive electrode and a negative electrode, and the battery protection board is electrically connected to the two electrode output terminals of the battery body. A flexible printed circuit (FPC) is electrically connected to the battery protection board. The flexible printed circuit is connected to the terminal motherboard through an electrical connector as a current conduction path, thereby realizing the electrical connection between the battery body and the charge and discharge module on the terminal motherboard to charge and discharge the battery and provide power to the mobile terminal.

[0034] In the related technology, the battery body is connected to the terminal mainboard only through a flexible circuit board as a current conduction path. During the high-current charging process, the flexible circuit board generates high heat power, which increases the heat generation of the entire battery, causing the charging temperature to rise, which in turn causes the battery charging current to decrease, the charging speed to decrease, and the charging time to increase, affecting the user experience.

[0035] In addition, when charging under low temperature conditions, due to the chemical characteristics of the battery itself, the internal impedance of the battery increases. When discharging to the same voltage, the discharge capacity decreases, and the capacity available to the user is reduced, resulting in a poor user experience.

[0036] In order to solve the problem in the related art that the battery body only uses a flexible circuit board as a current conduction path, resulting in reduced charging speed and extended charging time, as well as the problem of reduced battery discharge capacity at low temperatures, an embodiment of the present disclosure provides a battery assembly.

[0037] Figure 1 is a schematic diagram of a battery assembly according to an exemplary embodiment.

[0038] like Figure 1 As shown, the battery assembly 100 provided in the embodiment of the present disclosure includes a battery body 10, a battery protection board 20, a first flexible circuit board 30, a second flexible circuit board 40 and a path selection module (not shown).

[0039] The battery body 10 is an energy storage unit in the battery assembly 100, such as a common lithium-ion battery, which is made by lamination, winding, sealing, welding, formation and other processes. The battery body 10 is a flat battery to adapt to thin and light mobile terminals such as mobile phones and computers. However, the present disclosure is not limited to this, and the battery body 10 can also be in other shapes according to its application, such as a thick rectangular parallelepiped. One end of the battery body 10 leads out the output ends of the positive and negative electrodes (not shown) from the inside for electrical connection.

[0040] The battery protection board 20 is an integrated circuit board, including a control integrated circuit (IC), a metal-oxide-semiconductor field effect transistor (MOS tube), a precision resistor, etc., and is used to provide overcharge protection, over-discharge protection, overcurrent protection and short circuit protection for the battery assembly 100.

[0041] like Figure 1 As shown, the battery protection plate 20 is disposed at one end of the battery body 10 and is electrically connected to the output end of the electrode of the battery body 10. The battery protection plate 20 is in a long strip shape and is fixed to one end of the output end of the battery body 10 where the electrode is led out by bonding, welding, etc. along the width direction of the battery body 10, so as to be electrically connected to the output end of the electrode.

[0042] like Figure 1 As shown, in one embodiment, in order to facilitate the fixing of the battery protection plate 20, a step portion 11 is provided at one end of the battery body 10, and the battery protection plate 20 is fixed on the step portion 11. For example, the long side of the battery protection plate 20, which may be a long strip, is fixed on the step portion 11. The sum of the thickness of the battery protection plate 20 and the step portion 11 is less than or equal to the thickness of the battery body 10, which reduces the space occupied by the battery assembly 100 in electronic devices such as mobile terminals.

[0043] Flexible circuit boards are made of polyimide or polyester film as substrates, and are highly reliable and extremely flexible. They can be bent, wound, and folded freely, and can be arranged arbitrarily according to spatial layout requirements, and can be moved and stretched arbitrarily in three-dimensional space, and can withstand millions of dynamic bends without damaging the wires. They can realize the integration of component assembly and wire connection, greatly reduce the size and weight of electronic products, and meet the needs of electronic products developing in the direction of high density, miniaturization, and high reliability.

[0044] In the embodiment of the present disclosure, the first flexible circuit board 30 and the second flexible circuit board 40 are electrically connected to the battery protection board 20 in parallel, and then electrically connected to the battery body 10 in parallel. When the battery body 10 is charged and discharged, the first flexible circuit board 30 and the second flexible circuit board 40 provide a current conduction path for the charge and discharge current.

[0045] In the embodiment of the present disclosure, the first flexible circuit board 30 and the second flexible circuit board 40 are used as current conductors, and their actual impedance is very small, both at the mΩ level. The impedances of the first flexible circuit board 30 and the second flexible circuit board 40 are similar.

[0046] like Figure 1 As shown, in one embodiment, the first flexible circuit board 30 is attached to one end of the battery protection board 20 along the length direction of the battery protection board 20. The second flexible circuit board 40 is attached to one surface of the battery body 10.

[0047] The first flexible circuit board 30 can be connected from the side of the battery protection board 20. One end of the first flexible circuit board 30 is welded to the pad on the back of the battery protection board 20 and is electrically connected to the battery protection board 20. After being folded from the side of the battery protection board 20 to the front of the battery protection board 20, it is attached to one end of the battery protection board 20 along the length direction of the battery protection board 20. A first electrical connector 31 is provided at one end of the first flexible circuit board 30 that is not connected to the battery protection board 20, so as to facilitate pluggable electrical connection with an electrical connector on a structure such as a mobile terminal mainboard. The so-called front and back are relative concepts and do not represent absolute front and back.

[0048] In one embodiment, the first flexible circuit board 30 is attached to one end of the battery protection board 20 by double-sided adhesive. However, the present disclosure is not limited thereto, and the two can also be attached and fixed by glue dispensing, snapping, etc.

[0049] In one embodiment, the width of the first flexible circuit board 30 is less than or equal to the width of the battery protection board 20, and the length is not greater than 25% of the length of the battery protection board 20, so that the area of ​​the first flexible circuit board 30 is less than or equal to 25% of the area of ​​the battery protection board, thereby preventing the first flexible circuit board 30 from being too large and affecting the arrangement of electronic components on the battery protection board 20.

[0050] One end of the second flexible circuit board 40 is also welded to the pad on the back of the battery protection board 20, and is electrically connected to the battery protection board 20 in parallel with the first flexible circuit board 30. The second flexible circuit board 40 is attached to one surface of the battery body 10. A second electrical connector 41 is provided at one end of the second flexible circuit board 40 that is not connected to the battery protection board 20, so as to facilitate pluggable electrical connection with an electrical connector on a structure such as a mobile terminal mainboard.

[0051] In one embodiment, the second flexible circuit board 40 is bonded to the surface of the battery body 10 by double-sided adhesive. However, the present disclosure is not limited thereto, and the two can also be bonded and fixed by dispensing glue, snapping, hot pressing, etc.

[0052] In one embodiment, the width of the second flexible circuit board 40 is not greater than the width of the battery body 10, and the length is not greater than the length of the battery body 10. The area of ​​the second flexible circuit board 40 may occupy 50% to 90% of the area of ​​the surface of the battery body 10 to which it is attached.

[0053] In one embodiment, if Figure 1 As shown, a groove 12 is provided on the surface of the battery body 10 on which the second flexible circuit board 40 is fixed, and the second flexible circuit board 40 is fitted in the groove 12. The shape of the groove 12 may be determined according to the second flexible circuit board 40. The depth of the groove 12 may be greater than or equal to the thickness of the second flexible circuit board 40. The area of ​​the groove 12 is greater than or equal to the area of ​​the second flexible circuit board 40. Fitting the second flexible circuit board 40 in the groove 12 can protect the second flexible circuit board 40 on the one hand, and prevent the thickness of the battery assembly 100 from being too large on the other hand.

[0054] During the charging and discharging process, the path selection module (not shown) selects at least one of the first flexible circuit board 30 and the second flexible circuit board 40 as a current conduction path to charge and discharge the battery body 10 according to at least one of the charging current and the battery temperature.

[0055] There may be many specific implementation circuits of the path selection module, which may include an MCU, an A / D conversion circuit, an amplifier circuit, a comparator, etc. In one embodiment, the path selection module is integrated on the battery protection board 20 .

[0056] In one embodiment, the path selection module is configured as follows: when the charging current is greater than a preset current, the path selection module selects both the first flexible circuit board 30 and the second flexible circuit board 40 as current conduction paths to charge the battery body 10. When the charging current is less than or equal to the preset current, the path selection module selects the first flexible circuit board 30 as the current conduction path to charge the battery body 10.

[0057] The preset current may be pre-set at the factory according to the model of the battery body 10, or may be custom set based on factors such as the model of the battery body 10, capacity loss, and usage time, but the present disclosure is not limited thereto. In one embodiment, the preset current may be 5A to 10A, preferably 6A. The magnitude of the charging current may be measured by a current sensor on the battery protection board 20.

[0058] Generally, the battery charging process may include the following modes: 1. Low voltage pre-charging mode, a gradual activation charging for low battery voltage to prevent excessive charging current from damaging the battery; 2. Constant current charging mode or full-speed charging mode, which continuously charges the battery with normal voltage (generally when the battery voltage is higher than 3.0V and lower than 4.2V) at the maximum allowed charging current; 3. Constant voltage charging mode: in the later stage of charging, the charging voltage is controlled to be constant at a level slightly higher than the battery saturation voltage (generally 4.20V), and the charging current is gradually reduced for smooth charging. The closer the charging process is to the end, the slower it is; 4. Trickle charging mode, when the battery voltage reaches or approaches the saturation voltage, the charging voltage is controlled to remain constant to compensate for the capacity loss caused by self-discharge of the battery after it is fully charged; 5. Pulse charging mode, which is also a constant voltage control charging mode. When in trickle charging mode, it may periodically jump to full speed charging mode to form a pulse current to charge the battery, and then enter this pulse constant voltage control charging mode.

[0059] The path selection process during the charging process of the battery body 10 will be specifically introduced below in combination with the above five charging modes.

[0060] When the voltage of the battery body 10 is too low, it first enters the low voltage pre-charging mode. In this charging mode, the charging current is very small, and the path selection module determines that the charging current is less than the preset current, so the first flexible circuit board 30 is selected as the current conduction path to charge the battery body 10. At this time, the charging current flowing through the first flexible circuit board 30 is very small, so the heat generated by the first flexible circuit board 30 is low. In addition, the first flexible circuit board 30 does not directly contact the battery body 10, and will not cause charging temperature rise.

[0061] When the voltage of the battery body 10 is normal, it enters the constant current charging mode. In this charging mode, the battery body 10 is continuously charged with the maximum allowed charging current (for example, 10A). At this time, the path selection module determines that the charging current is greater than the preset current, and the path selection module selects the first flexible circuit board 30 and the second flexible circuit board 40 as the current conduction path to charge the battery body 10, and shunts the charging current. That is, the charging current flows through the first flexible circuit board 30 and the second flexible circuit board 40 at the same time.

[0062] At this time, the heating power P of the first flexible circuit board 30 1 =I 1 2 *R 1 , where P 1 is the heating power of the first flexible circuit board 30, I 1 is the charging current flowing through the first flexible circuit board 30, R 1is the impedance of the first flexible circuit board 30 .

[0063] The heating power P of the second flexible circuit board 40 2 =I 2 2 *R 2 , where P 2 is the heating power of the second flexible circuit board 40, I 2 is the charging current flowing through the second flexible circuit board 40, R 2 is the impedance of the second flexible printed circuit 40 .

[0064] In one embodiment, when the charging current is greater than the preset current, the path selection module selects the first flexible circuit board 30 and the second flexible circuit board 40 as current conduction paths to charge the battery body 10, including: the first flexible circuit board 30 and the second flexible circuit board 40 evenly share the charging current for charging. That is, the current flowing through the first flexible circuit board 30 and the second flexible circuit board 40 each accounts for half of the charging current.

[0065] Furthermore, the heating power of the first flexible circuit board 30 is The heating power of the second flexible circuit board 40 Wherein, I is the charging current I flowing through the first flexible circuit board 30 1 The charging current I flowing through the second flexible circuit board 40 2 The sum of .

[0066] Therefore, the total heat generation power of the first flexible circuit board 30 and the second flexible circuit board 40 is

[0067] When the battery assembly 100 includes only one flexible circuit board, for example, only the first flexible circuit board 30, the first flexible circuit board 30 is the only current conduction path, and the heat generation power P of the first flexible circuit board 30 is 1 =I 2 *R 1 .

[0068] The total heat generation power P of the first flexible circuit board 30 and the second flexible circuit board 40 which are both current conduction paths is compared with the heat generation power P of the first flexible circuit board 30 which is the only current conduction path. 1 By comparison, due to the impedance R of the first flexible circuit board 30 1 and the impedance R of the second flexible printed circuit 40 2 It can be seen that the total heat generation power P of the first flexible circuit board 30 and the second flexible circuit board 40, which are both current conduction paths, is approximately equal to the heat generation power P of the first flexible circuit board 30 as the only current conduction path. 1half.

[0069] Therefore, when the first flexible circuit board 30 and the second flexible circuit board 40 simultaneously serve as current conduction paths to shunt the charging current, the total heat generation power is reduced by approximately half, the heat generation is greatly reduced, and thus the charging temperature rise is reduced. The battery body 10 will not enter the constant voltage charging mode from the constant current charging mode due to excessive temperature, which prolongs the high current charging time of the constant current charging mode and shortens the low current charging time of the constant voltage charging mode, thereby greatly shortening the entire charging time of the battery and improving the user charging experience.

[0070] In the later stage of charging, in order to prevent overcharging, the constant voltage charging mode is entered, and the charging current is gradually reduced for stable charging. In this charging mode, when the charging current drops below the preset current, the path selection module determines that the charging current is less than the preset current, and thus switches from using the first flexible circuit board 30 and the second flexible circuit board 40 as the current conduction path to charging the battery body 10 with the first flexible circuit board 30 as the current conduction path. At this time, the charging current flowing through the first flexible circuit board 30 gradually decreases, so the heat generated by the first flexible circuit board 30 is low and will not cause charging temperature rise.

[0071] When the battery voltage reaches or approaches the saturation voltage, it enters the trickle charging mode. In this charging mode, the charging current is very small, and the path selection module determines that the charging current is less than the preset current, and still uses the first flexible circuit board 30 as the current conduction path to charge the battery body 10. Since the charging current is smaller, the heat generated by the first flexible circuit board 30 is lower, and the charging temperature rise will not be caused.

[0072] When in the trickle charging mode, it may periodically jump to the constant current charging mode and enter the pulse charging mode. In this charging mode, the path selection module periodically selects the current conduction path according to the comparison result between the charging current and the preset current. That is, the current conduction path jumps between the first flexible circuit board 30 and the first flexible circuit board 30 and the second flexible circuit board 40 connected in parallel.

[0073] In this embodiment, a first flexible circuit board 30 and a second flexible circuit board 40 are provided as dual flexible circuit boards and a path selection module. The path selection module selects the first flexible circuit board 30 and / or the second flexible circuit board 40 as a current conduction path to charge the battery body 10 according to a comparison result between the charging current and a preset current.

[0074] When the charging current is less than or equal to the preset current, the path selection module selects the first flexible circuit board 30 as the current conduction path. At this time, since the charging current is relatively small, the heat generated by the first flexible circuit board 30 is low, and the first flexible circuit board 30 does not directly contact the battery body 10, which will not cause the charging temperature to rise.

[0075] When the charging current is greater than the preset current, the path selection module selects the first flexible circuit board 30 and the second flexible circuit board 40 as the current conduction path at the same time. At this time, the charging current is shunted by the first flexible circuit board 30 and the second flexible circuit board 40, and the total heat generation power is reduced by approximately half, and the heat generation is greatly reduced, thereby reducing the charging temperature rise, extending the high current charging time, and shortening the low current charging time, thereby greatly shortening the entire charging time of the battery and improving the user charging experience.

[0076] At low temperatures, the chemical activity of the battery's internal materials decreases, causing the battery's internal impedance to increase and the battery's discharge voltage to increase. At the same discharge current, the battery reaches the discharge cutoff voltage earlier due to the increase in internal impedance, and the battery's discharge capacity decreases. Therefore, when discharging at low temperatures, trying to increase the battery temperature can help reduce the decrease in battery capacity.

[0077] In one embodiment, the battery assembly 100 further includes a temperature sensor 50, which detects the battery temperature and sends the battery temperature to the path selection module. The temperature sensor 50 is disposed on the battery body 10 to sense the temperature of the battery assembly 100. In one embodiment, a step portion 11 is disposed at one end of the battery body 10, and the temperature sensor 50 is disposed on the step portion 11, which can reduce the overall occupied space of the battery assembly 100.

[0078] The path selection module is further configured as follows: when the temperature detected by the temperature sensor 50 is greater than or equal to a preset temperature, the path selection module selects the first flexible circuit board 30 as a current conduction path to discharge the battery body; when the temperature detected by the temperature sensor 50 is less than the preset temperature, the path selection module selects the second flexible circuit board 40 as a current conduction path to discharge the battery body.

[0079] The preset temperature may be pre-set at the factory according to the model of the battery body 10, or may be custom set based on factors such as the model of the battery body 10, capacity loss, and usage time, but the present disclosure is not limited thereto. In one embodiment, the preset temperature may be -10°C to 20°C, preferably 10°C.

[0080] When the temperature sensed by the temperature sensor 50 is greater than or equal to the preset temperature, the path selection module determines that the battery temperature is greater than or equal to the preset temperature according to the received temperature signal, and selects the first flexible circuit board 30 as the current conduction path to discharge the battery body 10. At this time, the discharge current flows entirely through the first flexible circuit board 30. Since the discharge current generally does not exceed 2A, the heat generated by the first flexible circuit board 30 is relatively low, and the first flexible circuit board 30 is not in direct contact with the battery body 10, so the discharge temperature rise will not be increased, thereby ensuring the battery discharge capacity and improving the user experience.

[0081] When the temperature sensed by the temperature sensor 50 is lower than the preset temperature, the path selection module determines that the battery temperature is lower than the preset temperature based on the received temperature signal, and selects the second flexible circuit board 40 as the current conduction path to discharge the battery body. At this time, the discharge current flows entirely through the second flexible circuit board 40. Since the second flexible circuit board 40 is attached to the surface of the battery body 10, the heat generated by the second flexible circuit board 40 is conducted to the battery body 10, thereby generating a heating effect on the battery body 10, increasing the temperature of the battery body 10, reducing the internal impedance, increasing the battery discharge capacity, and improving the user experience.

[0082] In this embodiment, the path selection module selects the first flexible circuit board 30 or the second flexible circuit board 40 as the current conduction path to charge the battery body 10 according to the comparison result between the battery temperature and the preset temperature. When the battery temperature is greater than or equal to the preset temperature, the discharge current is controlled to flow through the first flexible circuit board 30, which will not increase the discharge temperature rise and ensure the battery discharge capacity. When the battery temperature is lower than the preset temperature, the discharge current is controlled to flow through the second flexible circuit board 40, which produces a heating effect on the battery body 10, increases the battery temperature, increases the battery discharge capacity, and improves the user experience.

[0083] In the embodiment of the present disclosure, a first flexible circuit board 30, a second flexible circuit board 40 and a path selection module are provided, and the path selection module selects the first flexible circuit board 30 and / or the second flexible circuit board 40 as a current conduction path to charge and discharge the battery body 10 according to the charging current and the battery temperature. The charging temperature rise during high current charging is reduced, the charging time is shortened, the battery discharge capacity during low temperature discharge is increased, the user experience is improved, and the problem of reduced charging speed and extended charging time caused by only using one flexible circuit board as a current conduction path in the related art is solved, as well as the problem of reduced battery discharge capacity at low temperatures.

[0084] Figure 2 It is a schematic diagram of a mobile terminal according to an exemplary embodiment.

[0085] like Figure 2As shown, according to the second aspect of the embodiment of the present disclosure, a mobile terminal 200 is provided, comprising the battery assembly 100 as described above and a terminal mainboard (not shown). The battery assembly 100 is electrically connected to the charging and discharging module of the terminal mainboard. For example, the first electrical connector 31 at one end of the first flexible circuit board 30 and the second electrical connector 41 at one end of the second flexible circuit board 40 are respectively pluggably electrically connected to the electrical connector on the terminal mainboard.

[0086] Mobile terminals can be electronic devices such as mobile phones, tablet computers, e-readers, and smart wearable devices.

[0087] According to a third aspect of an embodiment of the present disclosure, a method for charging and discharging a battery assembly includes:

[0088] In step S11 , at least one of a charging current and a battery temperature of the battery assembly 100 is acquired.

[0089] In the embodiment of the present disclosure, the charging current can be obtained by the current sensor in the battery protection board 20. The battery temperature can be obtained by the temperature sensor 50 disposed on the battery body 10.

[0090] In step S12 , at least one of the first flexible circuit board 30 and the second flexible circuit board 40 provided in the battery assembly 100 is selected as a current conduction path to charge and discharge the battery body 10 according to at least one of the charging current and the battery temperature.

[0091] In the embodiment of the present disclosure, during charging, according to the magnitude of the charging current, at least one of the first flexible circuit board 30 and the second flexible circuit board 40 is selected as a current conduction path to charge and discharge the battery body 10. During discharging, according to the magnitude of the battery temperature, at least one of the first flexible circuit board 30 and the second flexible circuit board 40 is selected as a current conduction path to discharge the battery body 10.

[0092] In one embodiment, step S12 selects at least one of the first flexible circuit board 30 and the second flexible circuit board 40 provided in the battery assembly 100 as a current conduction path to charge and discharge the battery body 10 according to at least one of the charging current and the battery temperature, including: when the charging current is greater than a preset current, selecting the first flexible circuit board 30 and the second flexible circuit board 40 as the current conduction path to charge the battery body 10 at the same time; when the charging current is less than or equal to the preset current, selecting the first flexible circuit board 30 as the current conduction path to charge the battery body 10.

[0093] Therefore, the charging and discharging method of the battery assembly includes the following steps.

[0094] In step S21 , the charging current of the battery assembly 100 is obtained.

[0095] In step S22, it is determined whether the charging current is greater than a preset current. When the charging current is greater than the preset current, step S23 is executed. When the charging current is less than or equal to the preset current, step S24 is executed.

[0096] In step S23 , the first flexible circuit board 30 and the second flexible circuit board 40 are selected as current conducting paths to charge the battery body 10 .

[0097] In step S24 , the first flexible circuit board 30 is selected as a current conducting path to charge the battery body 10 .

[0098] In the embodiment of the present disclosure, when the first flexible circuit board 30 and the second flexible circuit board 40 are selected as the current conduction path at the same time to charge the battery body 10, a part of the charging current flows through the first flexible circuit board 30, and the other part of the charging current flows through the second flexible circuit board 40. The sum of the heating power of the first flexible circuit board 30 and the second flexible circuit board 40 is less than the heating power of the flexible circuit board when the charging current flows through only one of the first flexible circuit board 30 or the second flexible circuit board 40, thereby reducing the charging temperature rise, extending the high current charging time, shortening the low current charging time, and thus shortening the entire charging time of the battery, improving the user charging experience.

[0099] In one embodiment, when the charging current is greater than a preset current, the first flexible circuit board 30 and the second flexible circuit board 40 are selected as current conduction paths to charge the battery body 10, including: the first flexible circuit board 30 and the second flexible circuit board 40 evenly share the charging current for charging.

[0100] In the embodiment of the present disclosure, the first flexible circuit board 30 and the second flexible circuit board 40 evenly share the charging current for charging, that is, the current flowing through the first flexible circuit board 30 and the second flexible circuit board 40 each accounts for half of the charging current. At this time, the sum of the heating power of the first flexible circuit board 30 and the second flexible circuit board 40 is approximately half of the heating power of the flexible circuit board when the charging current flows through only one of the first flexible circuit board 30 or the second flexible circuit board 40, and the heat generation is greatly reduced.

[0101] In one embodiment, the battery temperature is detected by a temperature sensor 50; when the detected battery temperature is greater than or equal to a preset temperature, the first flexible circuit board 30 is selected as a current conduction path to discharge the battery body 10; when the detected battery temperature is less than a preset temperature, the second flexible circuit board 40 is selected as a current conduction path to discharge the battery body 10.

[0102] Therefore, the charging and discharging method of the battery assembly includes the following steps.

[0103] In step S31 , the battery temperature is detected by the temperature sensor 50 .

[0104] In step S32, it is determined whether the battery temperature is greater than a preset temperature. When the battery temperature is greater than or equal to the preset temperature, step S33 is executed. When the battery temperature is less than the preset temperature, step S34 is executed.

[0105] In step S33 , the first flexible circuit board 30 is selected as a current conducting path to discharge the battery body 10 .

[0106] In step S34 , the second flexible circuit board 40 is selected as a current conducting path to discharge the battery body 10 .

[0107] In the disclosed embodiment, when the battery temperature is lower than a preset temperature, the discharge current is controlled to flow entirely through the second flexible circuit board 40 , thereby heating the battery body 10 , thereby increasing the temperature of the battery body 10 , reducing the internal impedance, increasing the battery discharge capacity, and improving the user experience.

[0108] The charging and discharging method of the battery assembly according to the present disclosure is not limited to the method described above. At least one of the first flexible circuit board 30 and the second flexible circuit board 40 can be selected as the current conduction path to charge and discharge the battery body 10 only according to the charging current. The first flexible circuit board 30 or the second flexible circuit board 40 can also be selected as the current conduction path to charge and discharge the battery body 10 only according to the battery temperature. At least one of the first flexible circuit board 30 and the second flexible circuit board 40 can also be selected as the current conduction path to charge and discharge the battery body 10 according to both the charging current and the battery temperature.

[0109] Based on the same concept, the embodiment of the present disclosure also provides a charging and discharging device for a battery assembly.

[0110] It is understandable that the charging and discharging device of the battery assembly provided in the embodiment of the present disclosure includes hardware structures and / or software modules corresponding to the execution of each function in order to realize the above functions. In combination with the units and algorithm steps of each example disclosed in the embodiment of the present disclosure, the embodiment of the present disclosure can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the technical solution of the embodiment of the present disclosure.

[0111] Figure 6 FIG. 1 is a block diagram of a charging and discharging device of a battery assembly according to an exemplary embodiment. Figure 6The battery assembly charging and discharging device 300 includes an acquisition module 301 and a path selection module 302 .

[0112] The acquisition module 301 is configured to acquire at least one of a charging current and a battery temperature of the battery assembly 100 .

[0113] The path selection module 302 is configured to select at least one of the first flexible circuit board 30 and the second flexible circuit board 40 provided in the battery assembly 100 as a current conduction path to charge and discharge the battery body 10 according to at least one of the charging current and the battery temperature.

[0114] In one embodiment, when the charging current is greater than a preset current, the path selection module 302 selects the first flexible circuit board 30 and the second flexible circuit board 40 as current conduction paths to charge the battery body 10; when the charging current is less than or equal to the preset current, the path selection module 302 selects the first flexible circuit board 30 as the current conduction path to charge the battery body 10.

[0115] In one embodiment, when the charging current is greater than a preset current, the first flexible circuit board 30 and the second flexible circuit board 40 evenly share the charging current for charging.

[0116] In one embodiment, the battery temperature is detected by a temperature sensor 50; when the detected battery temperature is greater than or equal to a preset temperature, the path selection module 302 selects the first flexible circuit board 30 as a current conduction path to discharge the battery body 10; when the detected battery temperature is less than the preset temperature, the path selection module 302 selects the second flexible circuit board 40 as a current conduction path to discharge the battery body 10.

[0117] Regarding the device in the above-mentioned embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment of the method, and will not be elaborated in detail here. It is understandable that "multiple" in the present disclosure refers to two or more, and other quantifiers are similar. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. The singular forms "a", "" and "the" are also intended to include plural forms, unless the context clearly indicates other meanings.

[0118] It is further understood that the terms "first", "second", etc. are used to describe various information, but such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other, and do not indicate a specific order or degree of importance. In fact, the expressions "first", "second", etc. can be used interchangeably. For example, without departing from the scope of the present disclosure, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as the first information.

[0119] It will be further understood that the terms “center”, “longitudinal”, “lateral”, “front”, “back”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present embodiment and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation.

[0120] It can be further understood that, unless otherwise specified, “connection” includes a direct connection without other components between the two, and also includes an indirect connection with other components between the two.

[0121] It is further understood that, although the operations are described in a specific order in the drawings in the embodiments of the present disclosure, it should not be understood as requiring the operations to be performed in the specific order shown or in a serial order, or requiring the execution of all the operations shown to obtain the desired results. In certain environments, multitasking and parallel processing may be advantageous.

[0122] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0123] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A battery assembly, characterized in that: include: Battery body; A battery protection plate, disposed at one end of the battery body and electrically connected to an output end of an electrode of the battery body; A first flexible circuit board and a second flexible circuit board are electrically connected to the battery protection board in parallel, the first flexible circuit board is attached to one end of the battery protection board along the length direction of the battery protection board, and the second flexible circuit board is attached to one surface of the battery body; as well as A path selection module selects at least one of the first flexible circuit board and the second flexible circuit board as a current conduction path to charge and discharge the battery body according to at least one of the charging current and the battery temperature; wherein, When the battery temperature is greater than or equal to a preset temperature, the path selection module selects the first flexible circuit board as a current conduction path to discharge the battery body; when the battery temperature is less than the preset temperature, the path selection module selects the second flexible circuit board as a current conduction path to discharge the battery body.

2. The battery assembly according to claim 1, characterized in that: The path selection module is configured to: When the charging current is greater than a preset current, the path selection module selects the first flexible circuit board and the second flexible circuit board as current conduction paths to charge the battery body; When the charging current is less than or equal to the preset current, the path selection module selects the first flexible circuit board as a current conduction path to charge the battery body.

3. The battery assembly according to claim 2, characterized in that: When the charging current is greater than a preset current, the path selection module selects the first flexible circuit board and the second flexible circuit board as current conduction paths to charge the battery body, including: The first flexible circuit board and the second flexible circuit board evenly share the charging current for charging.

4. The battery assembly according to claim 2, characterized in that: The battery assembly further includes a temperature sensor, which detects the battery temperature and sends the battery temperature to the path selection module.

5. The battery assembly according to claim 1, characterized in that: The area of ​​the first flexible circuit board is less than or equal to 25% of the area of ​​the battery protection board; The area of ​​the second flexible circuit board occupies 50% to 90% of the area of ​​the surface of the battery body.

6. The battery assembly according to claim 1, characterized in that: A groove is arranged on the surface of the battery body, and the second flexible circuit board is attached to the groove.

7. The battery assembly according to claim 1, characterized in that: The one end of the battery body is provided with a step portion, and the battery protection plate is fixed on the step portion.

8. The battery assembly according to claim 4, characterized in that: The one end of the battery body is provided with a step portion, and the temperature sensor is provided on the step portion.

9. The battery assembly according to claim 1, characterized in that: The path selection module is integrated on the battery protection board.

10. A mobile terminal, characterized in that: The mobile terminal comprises: A battery assembly, wherein the battery assembly is the battery assembly according to any one of claims 1 to 9; and The terminal mainboard, the battery assembly is electrically connected to the charging and discharging module of the terminal mainboard.

11. A method for charging and discharging a battery assembly, characterized in that: include: Obtaining at least one of a charging current and a battery temperature of a battery assembly; According to at least one of the charging current and the battery temperature, at least one of the first flexible circuit board and the second flexible circuit board provided in the battery assembly is selected as a current conduction path to charge and discharge the battery body; wherein the battery temperature is detected by a temperature sensor; When the detected battery temperature is greater than or equal to a preset temperature, selecting the first flexible circuit board as a current conduction path to discharge the battery body; When the detected battery temperature is lower than the preset temperature, the second flexible circuit board is selected as a current conduction path to discharge the battery body.

12. The method for charging and discharging a battery assembly according to claim 11, characterized in that: According to at least one of the charging current and the battery temperature, selecting at least one of a first flexible circuit board and a second flexible circuit board provided in the battery assembly as a current conduction path to charge and discharge the battery body, comprising: When the charging current is greater than a preset current, the first flexible circuit board and the second flexible circuit board are selected as current conduction paths to charge the battery body; When the charging current is less than or equal to the preset current, the first flexible circuit board is selected as a current conduction path to charge the battery body.

13. The method for charging and discharging a battery assembly according to claim 12, characterized in that: When the charging current is greater than a preset current, selecting the first flexible circuit board and the second flexible circuit board as current conduction paths to charge the battery body at the same time includes: The first flexible circuit board and the second flexible circuit board evenly share the charging current for charging.

14. A charging and discharging device for a battery assembly, characterized in that: include: An acquisition module, used to acquire at least one of a charging current and a battery temperature of a battery assembly; A path selection module is used to select at least one of the first flexible circuit board and the second flexible circuit board provided in the battery assembly as a current conduction path to charge and discharge the battery body according to at least one of the charging current and the battery temperature, wherein the battery temperature is detected by a temperature sensor, and when the detected battery temperature is greater than or equal to a preset temperature, the path selection module selects the first flexible circuit board as the current conduction path to discharge the battery body, and when the detected battery temperature is less than the preset temperature, the path selection module selects the second flexible circuit board as the current conduction path to discharge the battery body.

15. The charging and discharging device of the battery assembly according to claim 14, characterized in that: When the charging current is greater than a preset current, the path selection module selects the first flexible circuit board and the second flexible circuit board as current conduction paths to charge the battery body; When the charging current is less than or equal to the preset current, the path selection module selects the first flexible circuit board as a current conduction path to charge the battery body.

16. The charging and discharging device of the battery assembly according to claim 15, characterized in that: When the charging current is greater than the preset current, the first flexible circuit board and the second flexible circuit board evenly share the charging current for charging.

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