Patent Publication Number: US-2020280031-A1

Title: Handle battery, handle battery kit and hand-held gimbal

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is a continuation of International Application No. PCT/CN2018/071622, filed Jan. 5, 2018, the entire content of which is incorporated herein by reference. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates to a handle battery, a handle battery set, and a handheld gimbal, and belongs to the technical field of handheld movable photographing device. 
     BACKGROUND 
     A handheld gimbal is small in size and convenient to carry. It can be equipped with a small photographing device, such as a video camera, a camera, a smartphone, etc., and can reach the goal of quickly stabilizing a photographing device when shooting while moving, so as to achieve a good shooting effect. However, the existing handheld gimbal often runs out of power during use in some occasions. For a rechargeable handheld gimbal, a shooting job is stopped at that time, the handheld gimbal is sent as a whole for charging, and the shooting is resumed only after the handheld gimbal is charged, which is very inconvenient. For a battery-powered handheld gimbal, the battery needs to be replaced frequently, which not only increases an extra cost for a photographer, but also causes certain pollution problems. 
     SUMMARY 
     The present disclosure provides a handle battery, a handle battery set, and a handheld gimbal to solve the problem of inconvenient battery use for the existing handheld gimbals. 
     According to embodiments of the present disclosure, a handle battery is provided. The handle battery includes a casing, an upper cover, and a lower cover. The casing has an upper-end opening, a lower-end opening, and a receiving cavity located between the upper-end opening and the lower-end opening. The receiving cavity houses a battery cell configured for supplying power to a gimbal. The upper cover covers the upper-end opening and has a mounting groove configured for detachable connection with the gimbal. The mounting groove has an entrance for the gimbal to enter the mounting groove, a first surface opposite to the entrance, a first guide groove and a second guide groove that are opposite to each other and located between the entrance and the first surface, and a bottom surface below the entrance, the first surface, the first guide groove, and the second guide groove. In addition, a power supply interface for powering the gimbal is configured in the mounting groove. The lower cover covers the lower-end opening. 
     According to embodiments of the present disclosure, a handle battery set is provided that includes a handle battery and a charging base. The handle battery includes a casing, an upper cover, and a lower cover. The casing has an upper-end opening, a lower-end opening, and a receiving cavity located between the upper-end opening and the lower-end opening. The receiving cavity houses a battery cell configured for supplying power to a gimbal. The upper cover covers the upper-end opening and has a mounting groove configured for detachable connection with the gimbal. The mounting groove has an entrance for the gimbal to enter the mounting groove, a first surface opposite to the entrance, a first guide groove and a second guide groove that are opposite to each other and located between the entrance and the first surface, and a bottom surface below the entrance, the first surface, the first guide groove, and the second guide groove. In addition, a power supply interface for powering the gimbal is configured in the mounting groove. The lower cover covers the lower-end opening. The charging base is configured to be detachably snapped into the mounting groove. A surface of the charging base in contact with the power supply interface of the handle battery includes a charging interface, which matches the power supply interface to charge the handle battery. 
     According to embodiments of the present disclosure, a handheld gimbal is provided that includes a handle battery and a base gimbal. The handle battery includes a casing, an upper cover, and a lower cover. The casing has an upper-end opening, a lower-end opening, and a receiving cavity located between the upper-end opening and the lower-end opening. The receiving cavity houses a battery cell configured for supplying power to the base gimbal. The upper cover covers the upper-end opening and has a mounting groove configured for detachable connection with the base gimbal. The mounting groove has an entrance for the base gimbal to enter the mounting groove, a first surface opposite to the entrance, a first guide groove and a second guide groove that are opposite to each other and located between the entrance and the first surface, and a bottom surface below the entrance, the first surface, the first guide groove, and the second guide groove. In addition, a power supply interface for powering the base gimbal is configured in the mounting groove. The lower cover covers the lower-end opening. The base gimbal is configured to be detachably snapped into the mounting groove. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other objects, features, and advantages of embodiments of the present disclosure will become easier to understand by referring to the following detailed description with reference to the accompanying drawings. In the drawings, various embodiments of the disclosure will be described by way of examples and non-limiting manners. 
         FIG. 1  illustrates a schematic structural diagram of a handle battery according to exemplary embodiments of the present disclosure; 
         FIG. 2  is an enlarged view of an upper cover in  FIG. 1 ; 
         FIG. 3  is a rear view of the handle battery in  FIG. 1 ; 
         FIG. 4  is a right side view of the handle battery in  FIG. 1 ; 
         FIG. 5  is an exploded view of the handle battery in  FIG. 1 ; 
         FIG. 6  is an exploded view of a protection box and its internal structure according to another exemplary embodiment of the present disclosure; 
         FIG. 7  illustrates a schematic structural diagram of a handle battery set according to exemplary embodiments of the present disclosure; 
         FIG. 8  is an exploded view of the handle battery set in  FIG. 7 ; 
         FIG. 9  illustrates a schematic structural diagram of a charging base in  FIG. 7 ; and 
         FIGS. 10-12  are exploded views of a handheld gimbal provided in different perspectives according to exemplary embodiments of the present disclosure. 
         FIGS. 13 and 14  are a schematic structural diagram and an exploded view of another handheld gimbal according to exemplary embodiments of the present disclosure. 
     
    
    
       
     
       
         
           
               
             
               
                   
               
               
                 REFERENCE NUMERALS IN DRAWINGS 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
            
               
                   1 Handle battery 
                  11 Upper cover 
                  111 Top end 
               
               
                  112 Bottom end 
                  113 Mounting groove 
                  113a Entrance 
               
               
                  113b Rear end surface 
                  113c Left guide groove 
                  113d Right guide groove 
               
               
                  113e Bottom surface 
                  114 Guide slope 
                  115 Guide rail 
               
               
                  116 Upper rubber sleeve 
                  12 Main body 
                 1211 First casing 
               
               
                 1211a Protective colloid layer 
                 1212 Second casing 
                 1221 First housing 
               
               
                 1222 Second housing 
                 1223 Recess 
                 1224 Locking recess 
               
               
                  123 Bolt 
                  13 Lower cover 
                  14 Contact board 
               
               
                  141 Power supply interface 
                  141a Positive contact 
                  141b Negative contact 
               
               
                  142 Communication contact 
                  15 Protection board 
                  16 battery cell 
               
               
                  171 Control circuit board 
                  172 Remaining power indicator 
                  173 Control button 
               
               
                  181 Connection line 
                  182 Nickel sheet 
                  183 DuPont paper 
               
               
                  19 Bottom rubber pad 
                   2 Charging base 
                  21a Rear surface 
               
               
                  21b Front surface 
                  21c Left side 
                  21d Right side 
               
               
                  21e Top surface 
                  221 Plug 
                  222 First USB interface 
               
               
                  23 Second USB interface 
                   3 Gimbal 
                  31 Control section 
               
               
                  311a Left convex rib 
                  311b Right convex rib 
                  312 Connection plate 
               
               
                  313 Control knob 
                  32 Three-axis stabilization system 
               
               
                  33 Camera mounting bracket 
                   4 Handle battery 
                   5 Handle battery 
               
               
                   
               
            
           
         
       
     
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     Embodiments of the present disclosure are described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals throughout the disclosure indicate the same or similar elements or elements having the same or similar functions. Embodiments described below with reference to the drawings are exemplary and are intended to explain the present disclosure, but should not be construed as limiting the present disclosure. 
       FIG. 1  is a schematic structural diagram of a handle battery  1  provided in embodiments of the present disclosure.  FIG. 2  is an enlarged view of an upper cover of the handle battery in  FIG. 1 .  FIG. 3  is a rear view of the handle battery in  FIG. 1 .  FIG. 4  is a right side view of the handle battery in  FIG. 1 .  FIG. 5  is an exploded view of the handle battery in  FIG. 1 . 
     As shown in  FIGS. 1-5 , the handle battery  1  includes an upper cover  11 , a main body  12 , a battery cell  16  installed in the main body portion  12 , and a lower cover  13 . A top end  111  of the upper cover  11  is detachably connected to a gimbal, a bottom end  112  of the upper cover  11  is fixed to the top end of the main body  12 , and the bottom of the main body  12  is fixed to the lower cover  13 . In order to enable those skilled in the art to understand the technical solutions of this disclosure more clearly, structures of components of the handle battery  1  are described below in the sequence of the upper cover  11 , the main body  12 , and the lower cover  13 . 
     Continuing with reference to  FIGS. 1-5 , the upper cover  11  is solid or the upper half is a solid columnar structure. The cross section of the top end  111  includes a rectangular portion on the left and a roughly semi-elliptical portion on the right. When only the upper half of the upper cover  11  is solid, the cross-section of the bottom end  112  includes a semi-closed rectangular portion on the left and a semi-closed arc portion on the right. The front and back ends of the semi-closed arc are connected to the front and back ends of the semi-closed rectangular portion. It should be understood that, in some embodiments, a cross-section of the upper cover  11  may be oval, rectangular, or any other suitable geometric shape, and in some other embodiments, a cross section of the top end  111  of the upper cover  11  and a cross-section of the bottom end  112  may also be different. 
     Optionally, the upper cover  11  is configured as shown in  FIG. 1  and  FIG. 2  with a large top end  111  and a small bottom end  112  to increase the connection area between a gimbal and the handle battery  1 , thereby enhancing the connection strength between the two, and reducing the volume of the handle battery  1  to reduce the weight of the handle battery  1 . Optionally, in some other embodiments, the upper cover  11  may also have a structure that is substantially the same size from the top end  111  to the bottom end  112 , such as an oval column with the same size on the top and bottom for reducing the mold making cost. 
     A mounting groove  113  is provided on the top end  111  of the upper cover  11  or the middle part between the top end  111  and the bottom end  112  for snap connection with a gimbal. Optionally, as described below, the mounting groove  113  may also be used for snap connection with a charging base for charging the handle battery  1  or use the handle battery  1  to supply power to an external device connected to the charging base. The mounting groove  113  may have any shape, such as a dovetail groove (as shown in  FIGS. 1 and 2 ), a circular groove, or an oval groove. 
     Specifically, the mounting groove  113  is viewed from the perspective of  FIG. 1  and  FIG. 2 , and includes an entrance  113   a  for the bottom end of a gimbal or a charging base to enter, a rear end surface  113   b  opposite the entrance  113   a , a left guide groove  113   c  located between the entrance  113   a  and the rear end surface  113   b , a right guide groove  113   d  located between the entrance  113   a  and the rear end surface  113   b  and opposite the left guide groove  113   c , and a bottom surface  113   e  below the entrance  113   a , the rear end surface  113   b , the left guide groove  113   c , and the right guide groove  113   d . It may be understood that terms “front”, “rear”, “left”, “right”, “top”, and “bottom” used herein are directed to the directions in the drawings and are not a limitation on the present disclosure. 
     A power supply interface  141  configured for powering a gimbal is arranged in the mounting groove  113 , and the power supply interface  141  may be any one of a contact-type interface, a spring pin interface, a slot interface, and a plug-in interface. The followings use the contact-type interface installed in the dovetail groove in  FIG. 1  as an example to introduce specific structures and setting methods of the power supply interface  141  in detail. Those skilled in the art may directly or after simple replacement replace the following contact-type interface with any of the spring pin interface, slot interface, and plug-in interface. 
     As shown in  FIGS. 1 and 2 , a contact board  14  is provided at a position of the dovetail groove near the rear end surface  113   b . The contact board  14  is provided with a positive contact  141   a  and a negative contact  141   b  for supplying power to a gimbal. The positive and negative contacts are electrically connected to the battery cell  16  in the main body  12  through a connection line  181  that passes through the upper cover  11 . In some embodiments, the contact board  14  may include a positive contact plate provided with a positive contact  141   a , and a negative contact plate provided with a negative contact  141   b . Specifically, during manufacturing, the contact board  14  may be fixed on the bottom surface  113   e  of the dovetail groove by means of bolts or screws, or the contact board  14  may be fixed on the bottom surface  113   e  of the dovetail groove by means of bonding, welding, or fitting, which may improve reliability of connection between the positive contact  141   a  and the negative contact  141   b  on the contact board  14  and the connection line  181 , and avoid the failure of electrical connection between the contact interface and the battery cell  16 . For example, in some embodiments, the contact board  14  and the upper cover  11  may be formed as a single piece by injection molding, thereby achieving the purpose of embedding the positive contact  141   a  and the negative contact  141   b  on the bottom surface  113   e.    
     Optionally, as shown in  FIGS. 1 and 2 , the contact board  14  is provided protruding from the bottom surface  113   e  of the dovetail groove. Between the contact board  14  and the bottom surface  113   e  of the dovetail groove, a guide slope  114  extending toward the entrance  113   a  of the dovetail groove is provided. The guide slope  114  guides when a gimbal or a charging base is installed in the dovetail groove, so that the positive contact  141   a  and the negative contact  141   b  on the contact board  14  may be brought into contact with the negative contact and the positive contact at the bottom of the gimbal or the charging base, so as to achieve the purpose of electrical connection. 
     Alternatively, on the left and right sides of the bottom surface  113   e  of the dovetail groove, guide rails  115  is provided for guiding when a gimbal or a charging base is installed. The guide rails  115  protrude from the bottom surface  113   e  of the dovetail groove. By providing the guide rails  115 , it not only makes it convenient to install a gimbal or a charging base, but also prevents direct contact between the bottom surface of a gimbal or charging base and the bottom surface  113   e  of the dovetail groove in the initial stage of installation. Especially when the positive contact  141   a  and the negative contact  141   b  are provided on the bottom surface  113   e  of the dovetail groove, it may prevent the positive contact  141   a  and negative contact  141   b  on the contact board  14  from excessive friction with the bottom surface of a gimbal or a charging base, thereby avoiding damage. 
     In addition, in order to lock the handle battery  1  with a gimbal or charging base after the gimbal or charging base is installed in place, the guide rails or the inner walls of the dovetail groove (such as the left guide groove  113   c , the right guide groove  113   d , or the rear end surface  113   b ) are also provided with a connection slot or a connection hook that matches the gimbal or charging base. Under the guidance of the guide slope  114 , the gimbal or charging base slides obliquely upward when being installed in the dovetail groove, causing the connection slot or connection hook in the dovetail groove to engage with the connection hook or connection slot on the gimbal or charging base. As such, the gimbal or charging base is locked with the handle battery  1 . 
     Further, a protection board  15  is configured in the dovetail groove. The protection board  15  is provided with a through hole, and the contact board  14  is installed in the through hole. During assembly, the protection board  15  may be fixed to the bottom surface  113   e  of the mounting groove  113  by means of bolts or screws, or it may also be fixed to the bottom surface  113   e  of the mounting groove  113  by means of adhesion or fitting. By providing the above-mentioned protection board  15 , the contact board  14  may be protected to a certain extent. 
     It should be noted that in some embodiments, it is not limited to that the positive contact  141   a  and the negative contact  141   b  are provided on the bottom surface  113   e  of the dovetail groove, and the positive contact  141   a  and the negative contact  141   b  may also be provided on the rear end surface  113   b  of the dovetail groove. For example, the contact board  14  and the protection board  15  may be fixed on the rear end surface  113   b  of the dovetail groove. As such, a gimbal and a charging base only need to have matching contacts that may connect with the positive contact  141   a  and the negative contact  141   b  on the rear end surface  113   b  of the dovetail groove. 
     Further, a communication interface is also installed in the dovetail groove, and the communication interface is configured to connect a control circuit board  171  to be described below with a gimbal communicatively. Similar to the power supply interface  141 , the communication interface may also be any of a contact-type interface, a spring pin interface, a slot interface, and a plug-in interface. Take the contact-type interface of the communication interface in the dovetail groove as shown in  FIGS. 1 and 2  as an example. A communication contact  142  of the contact-type interface is communicatively connected to the control circuit board  171  through the connection line  181  that passes through the upper cover  11 . In an exemplary setting, the communication contact  142  may be provided on any surface of the dovetail groove, such as on the bottom surface  113   e  or the rear end surface  113   b.    
     Optionally, the communication contact  142  is integrated with the positive contact  141   a  and negative contact  141   b . For example, the communication contact  142  may also be provided on the above-mentioned contact board  14  to reduce area of the connection points, thereby improving the stability of electric current and signal transmission. In order to lower the risk of short circuit of the power supply interface  141 , the communication contact  142  may be configured between the positive contact  141   a  and the negative contact  141   b.    
     Further, referring to  FIGS. 1, 4 , and,  5 , in order to improve the grip comfort and insulation, the outer surface of the upper cover  11  may be wrapped with an upper rubber sleeve  116 . As such, when a user holds the upper cover  11  by hand, a partial elastic deformation may be generated to adapt to the shape of the palm, and when the handle battery  1  falls, the upper rubber sleeve  116  may protect the upper cover  11 , the contact board  12 , and the protection board  15 . 
       FIG. 6  is an exploded view of a protection box and its internal structure. Referring to  FIGS. 5 and 6 , the main body  12  includes a casing, a protection box accommodated in a receiving cavity, a control circuit board  171  held in the casing, and the connection line  181 . The battery cell  16  is housed in the protection box, and electrically connected to the control circuit board  171  and the power supply interface  141  through the connection line  181 . 
     The casing is a hollow cylindrical structure, which has an upper-end opening, a lower-end opening, and a receiving cavity between the upper-end opening and the lower-end opening configured for housing the battery cell  16  and the protection box. The cross section of the casing may be round, oval, rectangular, or irregular shapes. 
     Optionally, in order to facilitate the installation of the protection box in the receiving cavity, the casing may include a first casing  1211  and a second casing  1212  snapped together as shown in  FIG. 5 . The first casing  1211  is an arc-shaped plate with a notch at the rear end, the second casing  1212  is a rectangular plate with a notch at the front, and there is smooth transition between the first casing  1211  and second casing  1212 . Based on aforementioned structure of the casing, the first casing  1211  is configured as an arc-shaped plate with a notch at the rear end, so that the outer surface of the first casing  1211  may be matched with the shape of a palm, thereby improving the grip of the palm on the handle battery  1 . 
     Further, a protective colloid layer  1211   a  may also be fixed on the outer surface of the first casing  1211  by means of bonding, bolting, or interference connection, so as to facilitate a user&#39;s grasp. Furthermore, the protective colloid layer  1211   a  is elastic, so that when a user grasps the first casing  1211  by hand, the protective colloid layer  1211   a  may elastically deform under the action of the holding force to adapt to the shape of a palm, thereby enhancing the friction between the casing and a hand to prevent it from falling. Still further, multiple non-slip lines may be provided on the outer surface of the protective colloid layer  1211   a , as shown in  FIGS. 1, 4, and 6 , thereby increasing the frictional force during holding the handle battery  1  and preventing it from falling off. 
     The second casing  1212  is provided with a mounting hole for a remaining power indicator  172  at a position near the bottom end, and the remaining power indicator  172  is installed in the mounting hole. The remaining power indicator  172  is electrically connected to the control circuit board  171  and a control button  173  to be described later, to indicate the remaining electrical power of the battery cell  16  in an assembly of the battery cell  16 . The remaining power indicator  172  may be a light-emitting diode (LED) lamp or an incandescent lamp. It should be understood that the remaining power indicator  172  is not limited to be installed at the position near the bottom end of the second casing  1212 , and may be installed at any position on the second casing  1212  or the first casing  1211  in some other embodiments. 
     With continued reference to  FIG. 6 , the protection box may be a closed or semi-closed box. In some embodiments, it is an integrated structure made by injection molding process, heat shrinking process, or other forming methods. For example, one or more battery cells  16  may be connected to the connection line  181  and then placed in a mold, and then an integrated protection box is formed by injection molding, or the connected battery cells  16  and the connection line  181  are placed in plastic film, and then form an integrated protection box by heat shrinking. In other embodiments, the protection box may also have a split structure. A structure of the protection box will be described below with the basically closed box shown in  FIG. 6  as an example. 
     Referring to  FIG. 6 , the protection box includes a first housing  1221  and a second housing  1222  which are snapped together, so that one or more battery cells  16 , the control circuit board  171 , and the connection line  181  may be easily mounted in the cavity of the protection box. Specifically, the first housing  1221  and the second housing  1222  may be snapped together by means of snap-fitting, or may be fixedly connected together by bolts  123 , adhesive, or other fixing methods. 
     The battery cell  16  is accommodated in the cavity of the protection box, and is electrically connected to the control circuit board  171  and the power supply interface  141  of the upper cover  11  through the connection line  181 . In some embodiments, the battery cell  16  may be one or more cells. When there are multiple battery cells  16 , each cell  16  may be arranged horizontally or vertically, or two or more cells  16  may be connected in series and into a group first, and then multiple groups of cells  16  may be arranged horizontally or vertically. The positive electrode or negative electrode located at the top end and the negative electrode or positive electrode located at the bottom end are welded to nickel sheets  182  so as to be electrically connected to the positive contact  141   a  and the negative contact  141   b  on the upper cover  11  respectively through the connection line  181 , and be connected to the control circuit board  171  to supply power to the control circuit board  171 . DuPont paper  183  is provided on the negative electrode of the battery cell  16  to avoid short circuit of the battery cell  16 . 
     Optionally, first buckles are formed on an inner surface of the protection box, as shown in  FIG. 6 . A first buckle on the left side is engaged with the nickel sheet  182  on the left side by snap connection, the nickel sheet  182  is welded to the positive electrode of the battery cell  16 , and a first buckle on the right side is engaged with the nickel sheet  182  on the right side. The nickel sheet  182  on the right side is welded to the negative electrode of the battery cell  16 . 
     The protection box and the casing are fixed together by bolts  123 . In some other embodiments, second buckles are formed on the outer surface of the protection box and the inner surface of the casing, so that the protection box and the casing may be snapped together to further fix the protection box and the casing to avoid shaking of the protection box inside the casing. 
     Alternatively, a recess  1223  is provided on a portion of the protection box near the bottom end and a locking recess  1224  is provided in the recess  1223 . The control circuit board  171  is then snapped into the locking recess  1224 , and connected to the positive and negative electrodes of the battery cell  16  through the connection line  181 , and connected to the communication contact  142  of the upper cover  11 . 
     The control circuit board  171  is designed with a module or a circuit for obtaining parameters of the battery cell  16  such as the remaining electrical power, temperature, input electrical voltage, output electrical voltage, input electric current, and output electric current of the battery cell  16 . When multiple battery cells  16  (hereinafter referred to as a battery cell  16  group) are contained in the cavity of the protection box, the control circuit board  171  is also used to obtain the ratio of the remaining electrical power of each battery cell  16  to the total remaining power to balance the power of each battery cell  16  in the battery cell group, thereby avoiding excessive discharge of power of one or more battery cells  16  in a battery cell  16  group, and achieving the purpose of balancing the power of the battery cells  16 . In some embodiments, the control circuit board  171  may control the charging and/or discharging process of one battery cell  16  or a battery cell  16  group according to one or more of the above-mentioned parameters. For example, when a battery cell  16  group is installed in the protection box, and the ratio of the remaining power of one of the battery cells  16  to the total remaining power is higher than an average value during a discharge process, the control circuit board  171  controls the battery cell  16  and causes it to discharge first. When charging, if the ratio of the remaining power of one of the battery cells  16  to the total remaining power is smaller than an average value, the control circuit board  171  controls to charge the battery cell  16  first. For another example, when a single battery cell  16  is installed in the protection box, if the temperature of the battery cell  16  is higher than a threshold value during charging, the charging may be temporarily stopped or the charging current is reduced to protect the battery cell  16 . 
     In addition, through the connection line  181 , the control circuit board  171  also forms a circuit loop with the control button  173  to be described below, the remaining power indicator  172 , and the battery cell  16 . Hence, when the control button  173  is pressed, the circuit loop may be turned on, so that the control circuit board  171  may control the remaining power indicator  172  to light according to a preset rule to indicate the remaining power of the battery cell  16  that the control circuit board  171  obtains. Optionally, as shown in  FIGS. 4 and 5 , the remaining power indicator  172  and the control button  173  may also be directly soldered to the control circuit board  171  and electrically connected through the connection line  181  formed on the control circuit board  171 . 
     In some embodiments, the remaining power of the battery cell  16  may be indicated by the brightness or color change of the remaining power indicator  172 , or be indicated by the number of lamp beads of the remaining power indicator  172  that are lit. That is, the remaining power indicator  172  may have multiple lamp beads. 
     Further, when the remaining power indicator  172  is turned on for a period of time, the remaining power indicator  172  is controlled to automatically turn off to save power of the battery cell  16 . In some embodiments, a certain timing circuit may be set on the control circuit board  171 . When the control button  173  is pressed, the remaining power indicator  172  is lit and the timing circuit starts timing. When the timing circuit reaches a preset time, the control circuit board  171  generates a control signal to turn off the remaining power indicator  172 . It should be understood that the function of the timing circuit described above may also be implemented by an executable program stored in the memory of the control circuit board  171 . 
     Hence, the control circuit board  171  is provided in the battery cell  16  assembly, and the control circuit board  171 , the battery cell  16 , the control button  173 , and the remaining power indicator  172  form a circuit loop. When the control button  173  is pressed, the remaining power of the battery cell  16  obtained by the control circuit board  171  is indicated by the remaining power indicator  172 . Moreover, the control circuit board  171  may also be configured to control the remaining power indicator  172  to automatically turn it off after a period of time to save the power of the battery cell  16 . Optionally, as described above, the control circuit board  171  may also be configured to control a charging or discharging process of the battery cell  16  or the battery cell  16  group using an obtained parameter of the battery cell  16  or the battery cell  16  group. 
     In addition, although the main body  12  in the above embodiments includes a casing and a protection box inside the casing, in some other embodiments, the protection box may not be provided, and the battery cell  16  or the battery cell  16  group may be directly installed in the receiving cavity of the casing to reduce the number of structural components, thereby reducing the weight and cost of the handle battery  1 . Specifically, when the casing is made of a non-insulating material, an insulation effect may be achieved by providing a protection box in the casing, thereby improving the safety of the handle battery  1 ; but when the casing is made of an insulating material, it may not be needed to arrange a protection box to improve insulation protection capability. 
     Continuing to refer to  FIGS. 1 to 5 , the lower cover  13  is a columnar structure, which covers the lower-end opening of the casing. For example, the lower cover  13  may be fixed at the lower-end opening by means of a snap connection, an interference connection, and so on. The cross section of the lower cover  13  matches the cross-sectional shape of the lower end of the main body  12 , so that when the lower cover  13  covers the lower end of the main body  12 , the lower cover  13  covers the opening of the lower end of the main body  12 , thereby forming the receiving cavity configured to accommodate the battery cell  16  and the protection box. 
     Specifically, referring to  FIG. 5 , the lower cover  13  includes an upper opening, a bottom end opposite to the upper opening, and a side wall located between the upper opening and the bottom end. The side wall includes a front side wall, a rear side wall opposite to the front side wall, a left side wall connected to the left sides of the front and rear side walls, and a right side wall connected to the right sides of the front and rear walls. Optionally, the front side wall has a curved surface, the rear side wall, the left side wall, and the right side wall have a flat surface, and the left side wall and the right side wall smoothly transition to the front side wall. 
     Optionally, an external thread is provided at a position of the side wall near the top end, which is used to cooperate with an internal thread provided in the lower-end opening of the casing, so as to achieve the purpose of mounting the lower cover  13  on the main body  12 . In some other embodiments, an internal thread may also be provided at a position of the side wall near the top end and inside the upper opening, which is used to cooperate with the external thread provided at the lower end of the casing to mount the lower cover  13  on the main body  12 . 
     Alternatively, a control button mounting hole is provided on the rear side wall, and the above-mentioned control button  173  for controlling the remaining power indicator  172  is installed in the control button mounting hole and electrically connected to the control circuit board  171  in the main body  12 . It should be understood that the control button  173  may also be disposed on the front side wall, the left side wall, or the right side wall of the lower cover  13 , and in some other embodiments, the control button  173  may not be disposed on the lower cover  13 . 
     Optionally, a quarter screw hole (not shown in the figure) is provided at the bottom of the lower cover  13  configured for connecting with a tripod or other fixing device. 
     Further, a bottom rubber pad  19  is fixed to the bottom of the lower cover  13  by means of bonding, interference fit, or other connection methods, so as to protect the lower cover  13  and prevent the lower cover  13  from being damaged when the handle battery  1  is dropped vertically. 
     According to handle batteries of embodiments of the present disclosure, by forming a mounting groove on an upper cover of a handle battery, a gimbal may be detachably installed in the mounting groove. When power of the handle battery is used up, it may be removed and replaced with a spare handle battery for continuing photographing. A handle battery just used may be charged to replace the spare handle battery That is, with technical solutions of embodiments of the present disclosure, the purpose of continuous photographing may be achieved by replacing between a main handle battery and a spare handle battery. 
       FIG. 7  is a schematic structural diagram of a handle battery set provided in embodiments of the present disclosure.  FIG. 8  is an exploded view of  FIG. 7 , and  FIG. 9  is a schematic structural diagram of a charging base. As shown in  FIGS. 7-9 , the handle battery  1  described in the above embodiments may further include a charging base  2 , and the charging base  2  is configured to be snapped into the mounting groove  113  arranged on the upper cover  11  of the handle battery  1 . 
     Assuming that the mounting groove  113  configured on the upper cover  11  of the handle battery  1  is a dovetail groove, the shape of the left side  21   c  and the right side  21   d  of the charging base  2  matches the shape of the dovetail groove. It should be understood that when the mounting groove  113  has other shapes, the shape of the charging base  2  may be changed accordingly to achieve the snap connection with the mounting groove  113 . 
     The bottom surface of the charging base  2  is provided with an electrical connection interface electrically connected to the positive contact  141   a  and the negative contact  141   b  on the contact board  14 . A charging interface configured for charging the handle battery  1  is also provided on a top surface  21   e  and/or a front surface  21   b  of the charging base  2 . For example,  FIGS. 8 and 9  show a plug  221  provided on a top surface  21   e  of the charging base  2  for charging the handle battery  1 , and a first USB interface  222  provided on the front surface  21   b  of the charging base  2  for charging the handle battery  1 . Optionally, in some embodiments, only one of the charging interfaces may be provided, and positions of the plug  221  and the first USB interface  222  may be interchanged, that is, the plug  221  may be provided on the front surface  21   b  and the first USB interface  222  may be arranged on the top surface  21   e.    
     In addition, the charging base  2  is also provided with a discharge interface configured for electrically connecting with an external device to supply power to the external device through the handle battery  1 . For example,  FIG. 8  and  FIG. 9  show that the front surface  21   b  of the charging base  2  is provided with a second USB interface  23  for supplying power to an external device. Optionally, in some other embodiments, the second USB interface  23  may also be provided on the top surface  21   e  of the charging base  2 . 
     According to handle battery sets of embodiments of the present disclosure, by forming a mounting groove on an upper cover of a handle battery, a charging base may be detachably installed in the mounting groove to charge a handle battery. Further, by setting multiple different types of charging interfaces, different types of power sources may be used to charge a handle battery. For example, the plug and the first USB interface may be set such that a socket or a mobile power source may be used to charge a handle battery. In addition, by setting a second USB interface, power of a handle battery may be supplied to an external device, that is, the handle battery may be used as a mobile power source, so that it may supply power for a mobile phone or a tablet computer. 
       FIGS. 10-12  are exploded views of a handheld gimbal provided in embodiments from different perspectives. Referring to  FIGS. 10-12 , the embodiments also provide a handheld gimbal, which includes the handle battery  1  described above and a gimbal  3 . The bottom end of the gimbal  3  is snapped into the mounting groove  113  of the handle battery  1 . 
     In some embodiments, the gimbal  3  includes a control section  31  at the bottom, a three-axis stabilization system  32  fixed at the top of the control section  31 , and a camera mounting bracket  33  fixed at the top of the three-axis stabilization system  32 . Optionally, in some embodiments, the three-axis stabilization system  32  may not be provided, or the three-axis stabilization system  32  may be replaced with a two-axis stabilization system, or only one rotation axis is arranged that may rotate around the pitch, yaw, or roll direction. 
     The top of the control section  31  is provided with a mounting hole configured for mounting the three-axis stabilization system  32 . The side of the control section  31  is provided with a control button and a control knob  313  configured for controlling the gimbal and/or a camera. Optionally, a display panel may also be set on the side of the control section  31  to display status of one or more of the gimbal, the camera, and a battery cell. The bottom of the control portion  31  is provided with a left convex rib  311   a  and a right convex rib  311   b  that cooperate with the left guide groove  113   c  and the right guide groove  113   d  of the mounting groove  113  of the handle battery  1 . A connection plate  312  is also provided at the bottom of the control portion  31  to contact the contact board  14  installed in the mounting groove  113  of the handle battery  1 . The connection plate  312  is provided with a negative contact, a positive contact, and a communication contact that are in contact with the positive contact  141   a , the negative contact  141   b , and the communication contact  142  provided on the contact board  14 . Hence, power required by the control unit  31 , the three-axis gimbal stabilization system  32 , and/or the power required by the camera may be obtained from the handle battery  1 , and the control section  31  may communicate with the control circuit board  171  of the handle battery  1 . In some embodiments, the connection plate  312  is disposed between the left convex rib  311   a  and the right convex rib  311   b . It should be understood that when the charging interface and the communication interface provided in the mounting groove  113  of the handle battery  1  are other interfaces (such as a pin-type interface) instead of a contact-type interface type, correspondingly, an interface type matching the interface provided in the mounting groove  113  will be provided at the bottom of the control section  31  of the gimbal  3 . 
     When the gimbal  3  needs to be mounted on the handle battery  1 , insert the left convex rib  311   a  and the right convex rib  311   b  into the mounting groove  113  from the entrance  113   a  of the mounting groove  113 , and then slide along the left guide groove  113   c  and right guide groove  113   d  to the rear end surface  113   b  to a locking position and lock it to achieve the electrical and communicative connection between the gimbal  3  and the battery  1  handle, which is simple and convenient, and easy to operate. Control signals of the control section  31  of the gimbal  3  communicate with the control circuit board  171  of the handle battery  1  through the communication interface at the bottom and the communication interface in the mounting groove of the handle battery  1 . For example, the control circuit board  171  in the handle battery  1  may be controlled by the control section  31  of the gimbal  3 , or the camera installed on the gimbal  3  or the control section  31  of the gimbal  3  may obtain the power of the battery cell  16  in the handle battery  1  through the communication interface of the handle battery  1 . 
     The three-axis stabilization system  32  may be a three-axis stabilization system of any structure used in the current technology, including a pitch motor that drives a camera to move on the pitch axis, a yaw motor that drives the camera to move on the yaw axis, and a roll motor that drives the camera to move on the roll axis. 
     The camera mounting bracket  33  may be a bracket of any structure capable of mounting a camera, and is not specifically limited herein. Taking  FIGS. 10-12  for example, the camera mounting bracket  33  includes a substantially L-shaped arm fixed to the three-axis stabilization system  32 , a camera mount installed on a horizontal portion of the L-shaped arm, and a clamping bracket mounted on a vertical portion of the L-shaped arm. More specifically, a slide rail configured for mounting a camera is provided on the camera mount, and the camera is mounted on the slide rail. Optionally, in some other embodiments, a camera may be directly fixed on the camera mounting bracket  33 , instead of being detachably connected to the camera mounting bracket  33 . 
     According to handheld gimbals of embodiments of the present disclosure, when the power is used up, there is no need to take the whole set away for charging and interrupt shooting. It only needs to remove the current handle battery in use from a gimbal and replace it with a spare handle battery. When a spare handle battery is used, the handle battery just used may be sent for charging and may replace the spare handle battery that is currently in use after charging, so as to achieve the purpose of continuous photographing. 
       FIGS. 13 and 14  illustrate a schematic structural diagram and an exploded view of another handheld gimbal according to the present disclosure. The handheld gimbal includes the gimbal  3  as discussed above and handle batteries  4  and  5 . As shown in  FIGS. 13 and 14 , the bottom end of the gimbal  3  is snapped into a mounting groove of the handle battery  4 , the bottom end of the handle battery  4  is snapped into a mounting groove of the handle battery  5 , and the gimbal  3  and the handle batteries  4  and  5  are coupled to each other electrically and communicatively. 
     The handle batteries  4  and  5  have the same structure and same dimensions. Like the handle battery  1 , the handle batteries  4  and  5  each include an upper cover, a main body, and a lower cover. In some embodiments, the upper covers and main bodies of the handle batteries  4  and  5  and the handle battery  1  are the same. For example, as the handle battery  1 , the upper covers of the handle batteries  4  and  5  may include the same mounting groove, the same power supply interface, the same contact board, the same positive contact, the same negative contact, the same communication interface, etc. As the handle battery  1 , the main bodies of the handle batteries  4  and  5  may include the same casing that includes the same upper-end opening covered by the upper cover, the same lower-end opening covered by the lower cover, the same first casing, the same second casing, the same protection box, etc. As the handle battery  1 , the handle batteries  4  and  5  may include the same control button disposed on the casing or the lower cover, the same remaining power indicator, the same or similar control circuit board, and the same circuit loop formed by a battery cell, the control circuit board, the control button, and the remaining power indicator. 
     The lower cover of the handle batteries  4  and  5  may be fixed at the lower-end opening of the casing or the main body by means of a snap connection, an interference connection, and so on. The cross section of the lower cover matches the cross-sectional shape of the lower end of the main body, so that the lower cover covers the opening of the lower end of the main body, thereby forming a receiving cavity to accommodate the battery cell and protection box. 
     Like the bottom of the control portion  31  of the gimbal  3 , the bottom of the lower cover of the handle batteries  4  and  5  includes a left convex rib and a right convex rib that cooperate with a left guide groove and a right guide groove of a mounting groove of another handle battery that is the same as the handle batteries  4  and  5 . A connection plate is provided at the bottom of the lower cover of the handle batteries  4  and  5  to contact a contact board installed in the mounting groove of the other handle battery. In some embodiments, the connection plate may be disposed between the left convex rib and the right convex rib of the lower cover of the handle batteries  4  and  5 . The connection plate is provided with a negative contact, a positive contact, and a communication contact that are in contact with the positive contact, the negative contact, and the communication contact provided on the contact board of the other handle battery. Hence, the handle battery  4  or  5  may be coupled to another handle battery by detachable connection via the top end of the handle battery  4  or  5  in a first mode or the bottom end in a second mode. 
     As shown in  FIG. 13 , when the handle battery  4  runs out of power, the bottom of the lower cover of the handle battery  4  may be snapped into the mounting groove of the handle battery  5 . As such, power required by the control unit  31 , the three-axis gimbal stabilization system  32 , and/or power required by the camera may be obtained from the handle battery  5 , and the control section  31  may communicate with the control circuit boards of both the handle battery  4  and the handle battery  5 . When the gimbal  3  and handle batteries  4  and  5  are connected electrically and communicatively, as shown in  FIG. 13 , and the handle battery  4  has a low power level, several arrangements may be configured. In some embodiments, the handle battery  5  may supply power to the gimbal  3  only and does not charge the handle battery  4 . In some other embodiments, the handle battery  5  may supply power to the gimbal  3  and charge the handle battery  4  simultaneously. In some other embodiments, the handle battery  5  may only charge the handle battery  4  that supplies power to the gimbal  3 . 
     When the gimbal  3  needs to be mounted on the handle battery  4 , insert the left convex rib and the right convex rib of the gimbal  3  into the mounting groove of the handle battery  4 , slide along the left guide groove and right guide groove to a locking position, and then lock it to achieve the electrical and communicative connection between the gimbal  3  and the handle battery  4 . Similarly, when the handle battery  4  needs to be mounted on the handle battery  5 , insert the left convex rib and the right convex rib of the handle battery  4  into the mounting groove of the handle battery  5 , slide along the left guide groove and right guide groove to a locking position, and then lock it to achieve the electrical and communicative connection between the handle batteries  4  and  5 . In some embodiments, additional handle batteries may be attached to the handle battery  5  by snap connection. As such, the gimbal  3  may be connected with more than two handle batteries easily and conveniently when needed. 
     Control signals of the control section  31  of the gimbal  3  communicate with the control circuit boards of the handle batteries  4  and  5 , respectively. For example, the control circuit boards in the handle battery  4  and  5  may be respectively controlled by the control section  31  of the gimbal  3 , or the camera installed on the gimbal  3 . 
     Hence, when the power is used up, there is no need to take the whole set away for charging and interrupt a working session. A spare handle battery may be snapped onto the bottom of an existing handle battery to supply power, thereby achieving the purpose of continuous photographing. 
     Further, it should be noted that the above embodiments are used only to illustrate the technical solutions of the present disclosure and not to limit it to the present disclosure. Although the present disclosure is described in detail in the light of the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the preceding embodiments, or they can perform equivalent replacements for some or all of the technical features. The modifications or substitutions, however, do not make the nature of the corresponding technical solutions out of the scope of the technical solutions of each embodiment of the present disclosure.