Device using a battery pack

Abstract

The present disclosure provides a device using a battery pack, which includes a first battery, a second battery, and a device host; the discharge characteristic curves of the first battery and the second battery have a common voltage range, and at the same voltage within the common voltage range, the remaining capacity percentage of the first battery is less than that of the second battery; the first battery is detachably electrically connected to the device host, and the second battery is electrically connected to the device host; when the first battery is electrically connected to the device host, the first battery and the second battery are connected in parallel. In the device using a battery pack according to the present disclosure, the second battery is electrically connected to the device host, when the first battery is connected to the device host, the first battery is electrically connected to the device host and the first battery and the second battery are connected in parallel. By utilizing the different discharge characteristic curves of the first battery and the second battery, the function of uninterrupted power supply to the device host can be achieved.

Description

Technical Field

[0001] The present disclosure relates to the field of batteries, and particularly to a device using a battery pack. Background Art

[0002] For electronic devices generally powered by removable batteries, such as smart door locks and smart doorbells, when the battery is running out, the electronic device must be powered off, and then another spare battery is replaced or charged with a direct charger. However, powering off and replacing the battery will cause the electronic device to interrupt or stop working during this period, and if a direct charger is used, it must be close to the direct charging power source, which brings great inconvenience to users. Currently, once the battery is used up, it can only be taken out and replaced. There is also a solution of having an additional spare battery, but still, only one can be installed after taking out the other, and the device will still be unable to work for some time. Summary of the Invention

[0003] In view of the defects existing in the prior art, the purpose of the present disclosure is to provide a device using a battery pack, which can achieve uninterrupted power supply through a first battery and a second battery.

[0004] To achieve the above object, in some embodiments, the present disclosure provides a device using a battery pack, the device includes a first battery, a second battery, and a device host; wherein, the discharge characteristic curves of the first battery and the second battery have a common voltage range, and at the same voltage within the common voltage range, the remaining capacity percentage of the first battery is less than the remaining capacity percentage of the second battery; the first battery is detachably electrically connected to the device host, and the second battery is electrically connected to the device host; when the first battery is electrically connected to the device host, the first battery and the second battery are connected in parallel.

[0005] In some embodiments, within the common voltage range, the remaining capacity percentage of the first battery at voltage V0 is C1, and the remaining capacity percentage of the second battery at voltage V0 is C2, C2 / C1≥1.05.

[0006] In some embodiments, C2 / C1≥5.

[0007] In some embodiments, within the common voltage range, the voltage V0 of the first battery satisfies: Vh<V0<Vt; where Vh is the discharge cut-off voltage of the first battery, and Vt is the charge cut-off voltage of the first battery.

[0008] In some embodiments, 1.1×Vh<V0<0.85×Vt.

[0009] In some embodiments, the nominal capacity of the second battery is 5%-15% of the nominal capacity of the first battery.

[0010] In some embodiments, the nominal capacity of the second battery is 10% of the nominal capacity of the first battery.

[0011] In some embodiments, a current limiting unit is connected in series in the parallel circuit of the first battery and the second battery, and the current limiting unit is connected when the voltage difference between the first battery and the second battery is higher than a preset voltage threshold.

[0012] In some embodiments, the current limiting unit is a current limiting resistor, and the resistance value R1 of the current limiting resistor satisfies: R1 = U max / I max where U max is the voltage difference between the full charge voltage of the first battery and the discharge cut-off voltage of the second battery, and I max is the maximum safe charging current of the second battery.

[0013] In some embodiments, the first battery includes a single first battery cell, and the second battery includes a single second battery cell; or the first battery includes a plurality of first battery cells connected electrically, and the second battery includes a plurality of second battery cells connected electrically, and the series-parallel connection manner of the plurality of first battery cells connected electrically is the same as the series-parallel connection manner of the plurality of second battery cells connected electrically.

[0014] The beneficial effects of the present disclosure are as follows: In the device using a battery pack according to the present disclosure, the second battery is electrically connected to the device host, when the first battery is connected to the device host, the first battery is electrically connected to the device host and the first battery is connected in parallel with the second battery, and by utilizing the different discharge characteristic curves of the first battery and the second battery, the function of uninterrupted power supply of the device host can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is an assembly schematic diagram of an example of a device using a battery pack according to the present disclosure.

[0016] Figure 2 is a discharge characteristic curve of an example of the first battery cell and the second battery cell of a device using a battery pack according to the present disclosure.

[0017] Figure 3 is a discharge characteristic curve of another example of the first battery cell and the second battery cell of a device using a battery pack according to the present disclosure.

[0018] Figure 4 is an exploded schematic diagram of a first embodiment of a device using a battery pack according to the present disclosure.

[0019] Figure 5 isFigure 1 Circuit diagram of an embodiment of a device using a battery pack.

[0020] Figure 6 Circuit diagram of a second embodiment of a device using a battery pack according to the present disclosure.

[0021] Figure 7 Circuit diagram of a third embodiment of a device using a battery pack according to the present disclosure.

[0022] Figure 8 Circuit diagram of a fourth embodiment of a device using a battery pack according to the present disclosure.

[0023] Figure 9 Exploded view of a fifth embodiment of a device using a battery pack according to the present disclosure.

[0024] Figure 10 is Figure 9 Circuit diagram of an embodiment of a device using a battery pack.

[0025] Figure 11 Circuit diagram of a sixth embodiment of a device using a battery pack according to the present disclosure.

[0026] Among them, the reference numerals are explained as follows:

[0027] 100 First battery 22 Second battery management unit

[0028] 100a First interface 300 Switching circuit

[0029] 11 First battery cell 31 Current limiting unit

[0030] 12 Charging management unit 32 First switch

[0031] 13 Charging interface 33 Second switch

[0032] 14 First battery management unit 400 Device host 400

[0033] 200 Second battery 400a Second interface

[0034] 200a Third interface 400b Battery compartment

[0035] 200b Fourth interface 41 Control and acquisition system

[0036] 21 Second battery cell 500 Control chip Detailed implementation manners

[0037] The accompanying drawings illustrate embodiments of the present disclosure, and it will be understood that the disclosed embodiments are merely examples of the present disclosure, which can be implemented in various forms. Therefore, the specific details disclosed herein should not be construed as limiting, but only as a basis for the claims and as a representative basis for teaching those of ordinary skill in the art to implement the present disclosure in various ways.

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure. Apparently, the described embodiments are some, but not all, of the embodiments of the present disclosure.

[0039] In the description of the present disclosure, unless otherwise clearly specified and limited, the terms "first", "second", etc. in the specification and claims of the present disclosure or the above accompanying drawings are used to distinguish different objects, rather than to describe a specific order or primary and secondary relationship, nor can they be understood as indicating or implying relative importance.

[0040] Referring to Figures 1 to 3 , in the device using a battery pack according to the present disclosure, it includes a first battery 100, a second battery 200, and a device main body 400. The discharge characteristic curves of the first battery 100 and the second battery 200 have a common voltage range. At the same voltage within the common voltage range, the remaining capacity percentage of the first battery 100 is less than that of the second battery 200. The first battery 100 is detachably electrically connected to the device main body 400, and the second battery 200 is electrically connected to the device main body 400. When the first battery 100 is connected to the device main body 400, the first battery 100 is electrically connected to the device main body 400, and the first battery 100 and the second battery 200 are connected in parallel.

[0041] In the device using a battery pack according to the present disclosure, the second battery 200 is electrically connected to the device main body 400. When the first battery 100 is connected to the device main body 400, the first battery 100 is electrically connected to the device main body 400, and the first battery 100 and the second battery 200 are connected in parallel. By utilizing the different discharge characteristic curves of the first battery 100 and the second battery 200, the function of uninterrupted power supply to the device main body 400 can be achieved. Among them, the first battery 100 and the second battery 200 constitute a battery pack.

[0042] The discharge characteristic curve of the first battery 100 and the discharge characteristic curve of the second battery 200 have a common voltage range. At the same voltage within the common voltage range, the remaining capacity percentage of the first battery 100 is less than the remaining capacity percentage of the second battery 200. In other words, at the same remaining capacity percentage, the voltage of the first battery 100 is higher than the battery voltage of the second battery 200. That is to say, within the common voltage range, the discharge characteristic curve of the first battery 100 is higher than the discharge characteristic curve of the second battery 200.

[0043] When the first battery 100 is installed and connected to the device host 400 and is connected in parallel with the second battery 200, the first battery 100 and the second battery 200 supply power to the device host 400 in parallel. As the first battery 100 and the second battery 200 continue to supply power to the device host 400 in parallel, the voltages of the first battery 100 and the second battery 200 decrease synchronously. However, at the same voltage, the remaining capacity percentages of the first battery 100 and the second battery 200 are different, and the remaining capacity percentage of the first battery 100 is less than the remaining capacity percentage of the second battery 200. When the voltage of the first battery 100 drops to the point where the remaining capacity percentage of the first battery 100 reaches the level where the first battery 100 needs to be removed, for example, in Figure 2 In it, at about 3.7V, the remaining capacity percentage of the first battery 100 is 10%, and the remaining capacity percentage of the second battery 200 is 55%. If the first battery 100 is removed from the device host 400 at this time, the second battery 200 still has enough capacity to continue supplying power to the device host 400, and the device host 400 will not power off and interrupt operation because the first battery 100 is removed. During the period when the second battery 200 continues to supply power to the device host 400, the removed first battery 100 is charged. The charging process is opposite to the discharging process. The voltage of the first battery 100 increases until the charging ends. The battery voltage of the first battery 100 at the end of charging is higher than that of the second battery 200 that is still continuously supplying power to the device host 400. After the fully charged first battery 100 is put back into the device host 400 again, the first battery 100 is connected in parallel with the second battery 200 again to supply power to the device host 400. At this time, the battery voltage of the first battery 100 is higher than the battery voltage of the second battery 200, and the first battery 100 can charge the second battery 200 until the voltages of the first battery 100 and the second battery 200 are basically equal. Then, the first battery 100 stops charging the second battery 200, and the first battery 100 and the second battery 200 continue to supply power to the device host 400 in parallel until the first battery 100 needs to be removed again. This process is repeated continuously, thus realizing uninterrupted power supply to the device host.

[0044] The first battery 100 includes a first battery cell 11, and the second battery 200 includes a second battery cell 21.

[0045] In Figure 2 In the given example, the first battery 100 (i.e., the first battery cell 11) adopts an NCM (nickel-cobalt-manganese ternary) system, while the second battery 200 (i.e., the second battery cell 21) adopts an LCO (lithium cobalt oxide) system.

[0046] In Figure 3 In the given example, the first battery 100 (i.e., the first battery cell) adopts an NCM (nickel-cobalt-manganese ternary) system, while the second battery 200 (i.e., the second battery cell) adopts an LMO (lithium manganate) system.

[0047] By using different systems for the first battery 100 and the second battery 200, it is possible to simply and very flexibly select charge and discharge battery cells with different discharge characteristic curves from existing charge and discharge battery cells, thus extremely simply and conveniently implementing the above-mentioned uninterrupted power supply solution.

[0048] In order to increase the power supply time of the second battery 200 after the first battery 100 is removed from the device host 400, in some embodiments, within the common voltage range, the remaining capacity percentage of the first battery 100 at voltage V0 is C1, and the remaining capacity percentage of the second battery 200 at voltage V0 is C2, and C2 / C1 ≥ 1.05.

[0049] In order to further increase the power supply time of the second battery 200 after the first battery 100 is removed from the device host 400, in some embodiments, C2 / C1 ≥ 5.

[0050] In some embodiments, within the common voltage range, the voltage V0 of the first battery 100 satisfies: Vh < V0 < Vt; where Vh is the discharge cut-off voltage of the first battery 100, and Vt is the charge cut-off voltage of the first battery 100.

[0051] In order to avoid using the start and end segments of the discharge curve of the first battery 100 within the common voltage range, in some embodiments, 1.1×Vh < V0 < 0.85×Vt.

[0052] In some embodiments, the nominal capacity of the second battery 200 is 5% - 15% of the nominal capacity of the first battery 100. Thus, the first battery 100 and the second battery 200 can be respectively referred to as the main battery and the slave battery. Therefore, the second battery 200 can only temporarily supply power to the device host 400 during the period after the first battery 100 is removed and the second battery 200 is recharged separately to full charge. So, the nominal capacity of the second battery 200 does not need to be as large as that of the first battery 100. In this way, when implementing uninterrupted power supply, the manufacturing cost of the second battery 200 will also be greatly reduced.

[0053] In some embodiments, the nominal capacity of the second battery 200 is 10% of the nominal capacity of the first battery 100; in some embodiments, the nominal capacity of the first battery 100 is 5000 mAh, and the nominal capacity of the second battery 200 is 500 mAh.

[0054] In some embodiments, a current limiting unit 31 is connected in series in the parallel circuit of the first battery 100 and the second battery 200. When the voltage difference between the first battery 100 and the second battery 200 is higher than a preset voltage threshold, the current limiting unit 31 is connected, that is, it is connected in a controlled manner. The purpose of connecting the current limiting unit 31 is to prevent the voltage difference between the first battery 100 and the second battery 200 from being too large when the first battery 100 is connected to the device host 400, and the charging current of the first battery 100 to the second battery 200 from being too large and damaging the second battery 200. When the voltage difference between the first battery 100 and the second battery 200 is not higher than the preset voltage threshold, the current limiting unit 31 is not connected to the parallel circuit of the first battery 100 and the second battery 200, thereby reducing the impedance of the parallel circuit of the first battery 100 and the second battery 200.

[0055] In some embodiments, the current limiting unit 31 is a current limiting resistor, and the second battery 200 includes a second battery cell 21. The resistance value R1 of the current limiting resistor satisfies: R1 = U max / I max , where U max is the voltage difference between the full charge voltage of the first battery 100 and the discharge cut-off voltage of the second battery 200, and I max is the maximum safe charging current of the second battery 200. The maximum safe charging current of the second battery 200 is determined by the specifications of the second battery cell 21 of the second battery 200. The maximum safe charging current of the second battery 200 = the capacity of the second battery 200 multiplied by the charging rate, and the charging rate is determined by the material of the second battery cell 21 of the second battery 200 itself.

[0056] In order to ensure the above relative relationship between the discharge characteristic curves of the first battery 100 and the second battery 200, in some embodiments, the first battery 100 includes a single first battery cell 11, and the second battery 200 includes a single second battery cell 21; in other embodiments, the first battery 100 includes a plurality of first battery cells 11 connected electrically, and the second battery 200 includes a plurality of second battery cells 21 connected electrically. The series-parallel connection method of the plurality of first battery cells 11 connected electrically is the same as the series-parallel connection method of the plurality of second battery cells 21 connected electrically. For example, in Figure 1 , the first battery 100 includes two first battery cells 11 connected in series, while the second battery 200 includes two second battery cells 21 connected in series.

[0057] In the present disclosure, devices using a battery pack, such as, smart door locks, smart doorbells, mobile phones, portable devices, laptops, battery-powered vehicles, electric vehicles, ships, spacecrafts, electric toys, and electric tools, etc. The battery pack can be housed in the battery compartment of the device, and the battery pack provides power for the device. The battery pack described in the present disclosure is not limited to the devices described above, but can also be applied to all devices using a battery pack.

[0058] The following refers to Figures 4 to 11 describe Figure 1 Some embodiments of the specific circuit of the device using a battery pack.

[0059] In Figures 4 to 8 In the embodiment, the second battery 200 is built into the device main body 400. The device main body 400 is provided with a battery compartment 400b, and the first battery 100 is detachably housed in the battery compartment 400b.

[0060] In Figure 5 In the circuit diagram of the first embodiment shown, the device using a battery pack includes a first battery 100, a second battery 200, and a device main body 400.

[0061] The first battery 100 includes a first battery cell 11, a charging management unit 12, a charging interface 13, a first battery management unit 14, a switching unit 300, and a control chip 500. The first battery 100 is provided with a first interface 100a. The negative terminal of the first battery cell 11 is grounded. One end of the charging management unit 12 is connected to the positive terminal of the first battery cell 11. The other end of the charging management unit 12 is connected to the charging interface 13, and the charging management unit 12 controls overcharging, charging cut-off voltage, full charge voltage, etc. The charging interface 13 is connected to the first battery cell 11 through the charging management unit 12, and the charging interface 13 is used to connect to an external power source to charge the first battery cell 11 when the first battery 100 is removed. The first battery management unit 14 is connected to the first battery cell 11 and is also connected to the control chip 500. The first battery management unit 14 generally consists of a battery protection unit, a fuel gauge unit, and a balancing unit, and provides information such as the real-time voltage, real-time capacity, real-time temperature, discharge cut-off voltage, charging cut-off voltage, and nominal capacity of the first battery cell 11 to communicate with the control chip 500.

[0062] The switching circuit 300 includes a current limiting unit 31, a first switch 32, and a second switch 33. One end of the current limiting unit 31 is communicatively connected to the positive electrode end of the first battery cell 11, the one end of the charging management unit 12, and the control chip 500. The other end of the current limiting unit 31 is connected to one end of the second switch 33. The first switch 32 is connected in parallel across both ends of the current limiting unit 31 to form a parallel node. The second switch 33 is connected in series between the parallel node corresponding to the other end of the current limiting unit 31 and the first interface 100a. The first switch 32 and the second switch 33 are communicatively connected to the control chip 500.

[0063] The control chip 500 is a single-chip microcomputer processing unit. The control chip 500 is communicatively connected to the first interface 100a.

[0064] The second battery 200 includes a second battery cell 21 and a second battery management unit 22. The positive electrode end of the second battery cell 21 is connected to the positive power supply terminal of the device host 400. The negative electrode end of the second battery cell 21 is grounded. The second battery management unit 22 is connected to the second battery cell 21. Similarly, the second battery management unit 22 generally consists of a battery protection unit, a fuel gauge unit, and a balancing unit, and provides information such as the real-time voltage, real-time capacity, real-time temperature, charging cut-off voltage, discharging cut-off voltage, maximum safe charging current, charging rate, and nominal capacity of the second battery cell 21.

[0065] The device host 400 is provided with a second interface 400a, and the second interface 400a is connected to the positive electrode end of the second battery cell 21. The negative power supply terminal of the device host 400 is grounded. The device host 400 includes a control and acquisition system 41. The control and acquisition system 41 is communicatively connected to the second interface 400a.

[0066] After the first battery 100 is installed in the battery compartment 400b of the device host 400, the first interface 100a and the second interface 400a are communicatively connected. The control chip 500 controls both the first switch 32 and the second switch 33 to be in the off state. The control chip 500 obtains the voltage of the first battery 100 via the first battery management unit 14. The control chip 500 obtains the voltage of the second battery 200 via the first interface 100a, the second interface 400a, and the second battery management unit 22 (and / or the control acquisition system 41). The control chip 500 compares the voltage difference between the first battery 100 and the second battery 200. If the voltage difference is greater than a preset value (such as 10 mV), the control chip 500 turns on the second switch 33 and turns off the first switch 32. The current limiting unit 31 is connected to the parallel circuit of the first battery 100 and the second battery 200. The first battery 100 charges the second battery 200 through the current limiting unit 31 and the second switch 33. At the same time, the first battery 100 supplies power to the device host 400. At this time, the control acquisition system 41 controls the second battery 200 to supply power to the device host 400 simultaneously; until the voltage difference across the current limiting unit 31 is less than the preset value (such as 10 mV), that is, the voltages of the first battery 100 and the second battery 200 are basically equal, the control chip 500 keeps the second switch 33 on and turns on the first switch 32. The current limiting unit 31 is no longer connected to the parallel circuit of the first battery 100 and the second battery 200. The first battery 100 and the second battery 200 are connected in parallel through the first switch 32 and the second switch 33 to supply power to the device host 400; as the first battery 100 and the second battery 200 are connected in parallel to supply power to the device host 400, the voltages of the first battery 100 and the second battery 200 gradually decrease synchronously. When the remaining capacity percentage (i.e., the battery level) of the first battery 100 is lower than the preset value (such as 10%), the device host 400 detects the low battery level of the first battery 100 through the control acquisition system 41 via the second interface 400a, the control chip 500, and the first battery management unit 14. The control acquisition system 41 of the device host 400 notifies the user to charge the first battery 100 in time, for example, by means of sound and light. When the user removes the first battery 100 from the battery compartment 400b of the device host 400, the control chip 500 controls the first switch 32 and the second switch 33 to be in the off state. The first battery 100 is connected to an external power source through the charging interface 13 to charge the first battery cell 11. The charging management unit 12 manages the charging process of the first battery 100. The first battery management unit 14 communicates the status information of the charging process to the control chip 500. Before and during the charging process of the first battery 100 and before it is put back into the battery compartment 400b of the device host 400, the second battery 200 supplies power to the device host 400 alone. The control acquisition system 41 and the second battery management unit 22 communicate with each other to monitor the discharge process of the second battery 200.

[0067] Figure 6The circuit diagram of the second embodiment shown is basically the same as that of Figure 5 's first embodiment, except that in Figure 6 the circuit diagram of the second embodiment shown, the first battery 100 does not have a control chip 500, the first battery management unit 14 is directly communicatively connected to the first interface 100a, the first switch 32 and the second switch 33 are communicatively connected to the first interface 100a, and the control acquisition system 41 of the device host 400 also integrates Figure 5 the function of the control chip 500 (i.e., the control acquisition system 41 compares the pressure difference between the first battery 100 and the second battery 200, and controls the conduction and disconnection of the first switch 32 and the second switch 33). The operation process is basically the same as that of Figure 5 's first embodiment, and the detailed description of the operation process is omitted here.

[0068] Figure 7 The circuit diagram of the third embodiment shown is basically the same as that of Figure 6 's second embodiment, except that in Figure 7 the circuit diagram of the third embodiment shown, the switching unit 300 of the first battery 100 is changed to be arranged in the device host 400, one end of the charging management unit 12 is connected to the positive electrode of the first battery cell 11 and the first interface 100a, the first battery management unit 14 is directly communicatively connected to the first interface 100a, one end of the current limiting unit 31 is connected to the first interface 100a, the other end of the current limiting unit 31 is connected to one end of the second switch 33, the first switch 32 is connected in parallel at both ends of the current limiting unit 31 to form a parallel node, and the second switch 33 is connected in series between the parallel node corresponding to the other end of the current limiting unit 31 and the positive electrode of the second battery cell 21 of the second battery 200. The first switch 32 and the second switch 33 are communicatively connected to the control acquisition system 41. Similarly, the detailed description of its operation process is omitted here.

[0069] Figure 8 The circuit diagram of the fourth embodiment shown is basically the same as that of Figure 7 's third embodiment, except that in Figure 8 the circuit diagram of the third embodiment shown, the switching unit 300 is integrated into the second battery 200. Similarly, the detailed description of its operation process is omitted here.

[0070] In Figures 9 to 11 's embodiment, the first battery 100 and the second battery 200 are both external batteries. The first battery 100 and the second battery 200 are combined into a mother - son battery and housed in the battery compartment 400b of the device host 400 to supply power to the device host 400; the first battery 100 can be taken off separately for charging.

[0071] Since the first battery 100 and the second battery 200 can be installed together in the battery compartment 400b of the device main unit 400 and the first battery 100 can be removed individually, therefore, in Figure 10 the circuit diagram of the fifth embodiment of Figure 11 and the circuit diagram of the sixth embodiment of

[0072] In Figure 10 the circuit diagram of the fifth embodiment of Figure 5 the first battery 100 has the same configuration as the first battery 100 in the circuit diagram of the fifth embodiment of Figure 10 except that the third interface 200a and the fourth interface 200b of the second battery 200 shown in Figure 10 are communicatively connected to each other. In other words, in the circuit diagram of the fifth embodiment of Figure 5 the second battery 200 and the device main unit 400 are of a split structure, and the second battery 200 is communicatively connected to the control and acquisition system 41 of the device main unit 400 via the fourth interface 200b and the second interface 400a; while in the circuit diagram of the first embodiment of

[0073] Figure 11 the second battery 200 is integrally formed with the device main unit 400, and the second battery 200 is directly communicatively connected to the control and acquisition system 41 of the device main unit 400. Similarly, the detailed description of its operation process is omitted here. Figure 10 the circuit diagram of the sixth embodiment of Figure 11 is basically the same as the circuit diagram of the fifth embodiment of Figure 11 except that the switching unit 300 and the control chip 500 of the first battery 100 are changed to be disposed in the second battery 200. In Figure 10 the switching unit 300 is connected to the charging management unit 12 and the first battery management unit 14 via the third interface 200a and the first interface 100a, and the control chip 500 is connected to the charging management unit 12 and the first battery management unit 14 via the third interface 200a and the first interface 100a. In other words,

[0074] The detailed description above describes multiple exemplary embodiments, but the present disclosure is not intended to be limited to the explicitly disclosed combinations. Thus, unless otherwise stated, the various features disclosed herein may be combined together to form multiple additional combinations not shown for the sake of brevity.

[0075] The above are only the preferred embodiments of the present disclosure and are not used to limit the present disclosure. For those skilled in the art, various changes and modifications can be made to the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included within the protection scope of the present disclosure.

Claims

1. A device using a battery pack, the device comprising a first battery, a second battery, and a device host; wherein, the first battery and the second battery adopt different systems, the discharge characteristic curves based on voltage-discharge capacity of the first battery and the second battery have a common voltage range, and at the same voltage within the common voltage range, the remaining capacity percentage of the first battery is less than the remaining capacity percentage of the second battery; the first battery is detachably electrically connected to the device host, and the second battery is electrically connected to the device host; when the first battery is electrically connected to the device host, the first battery and the second battery are connected in parallel; when the battery voltage of the first battery is higher than the battery voltage of the second battery, the first battery charges the second battery until the battery voltages of the first battery and the second battery are equal, after which the first battery no longer charges the second battery, and the first battery and the second battery are connected in parallel to supply power to the device host.

2. The device using a battery pack according to claim 1, wherein, within the common voltage range, the remaining capacity percentage of the first battery at voltage V0 is C1, and the remaining capacity percentage of the second battery at voltage V0 is C2, and C2 / C1≥1.

05.

3. The device using a battery pack according to claim 2, wherein, C2 / C1≥5.

4. The device using a battery pack according to claim 1, wherein, within the common voltage range, the voltage V0 of the first battery satisfies: Vh<V0<Vt; wherein, Vh is the discharge cut-off voltage of the first battery, and Vt is the charge cut-off voltage of the first battery.

5. The device using a battery pack according to claim 4, wherein, 1.1×Vh<V0<0.85×Vt.

6. The device using a battery pack according to claim 1, wherein, the nominal capacity of the second battery is 5%-15% of the nominal capacity of the first battery.

7. The device using a battery pack according to claim 6, wherein, The nominal capacity of the second battery is 10% of the nominal capacity of the first battery.

8. The device using a battery pack according to claim 1, wherein, a current limiting unit is connected in series in the parallel circuit of the first battery and the second battery, when the voltage difference between the first battery and the second battery is higher than a preset voltage threshold, the current limiting unit is connected in.

9. The device using a battery pack according to claim 8, wherein, the current limiting unit is a current limiting resistor, The resistance value R1 of the current-limiting resistor satisfies: R1 = U max / I max , Among them, U max is the voltage difference between the full charge voltage of the first battery and the discharge cut-off voltage of the second battery, and I max is the maximum safe charging current of the second battery.

10. The device using a battery pack according to claim 1, wherein, the first battery includes a single first battery cell, and the second battery includes a single second battery cell; or the first battery includes a plurality of first battery cells connected electrically, and the second battery includes a plurality of second battery cells connected electrically, and the series-parallel connection manner of the plurality of electrically connected first battery cells is the same as the series-parallel connection manner of the plurality of electrically connected second battery cells.

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