Patent Publication Number: US-11045058-B2

Title: Cleaner

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims priority under 35 U.S.C. § 119 to Korean Patent Application No. 10-2016-0108317, filed in Korea on Aug. 25, 2016, and Korean Patent Application No. 10-2016-0183825, filed in Korea on Dec. 30, 2016, whose entire disclosure is hereby incorporated by reference. 
     BACKGROUND 
     The present disclosure relates to a cleaner. 
     Cleaners may be classified into a manual cleaner that a user moves in person for cleaning and an automatic cleaner that automatically moves for cleaning. 
     Manual cleaners may fall into, depending on the types, a canister cleaner, an upright cleaner, a handy cleaner, and a stick cleaner. 
     Meanwhile, in the related art, a handheld vacuum cleaner has been disclosed in Korean Patent No. 10-1127088 (registered on 8 Mar. 2012). 
     The handheld vacuum cleaner includes a suction pipe, an airflow generator, a cyclone, a power supply, and a handle. 
     The cyclone is disposed between the handle and the suction pipe, the airflow generator is disposed right over the handle, and the power supply is disposed right under the handle. Accordingly, the airflow generator and the power supply are disposed behind the cyclone. 
     The power supply includes a plurality of battery cells laid in parallel. There is a problem in the prior art document in that it is required to disassemble the cleaner in order to separate the power supply from the cleaner. 
     Further, since the battery cells are laid in parallel on one layer, there is a problem in that the volume occupied by the power supply is large and the maximum voltage that the power supply can supply to a suction motor is small. 
     SUMMARY 
     The present disclosure provides a cleaner that allows a battery to be easily mounted and separated. 
     The present disclosure provides a cleaner in which contact between a battery terminal and a main body terminal can be stably maintained even if the battery is frequently mounted and separated. 
     The present disclosure provides a cleaner in which deformation of a circuit board on which a battery terminal is mounted is prevented when a battery is mounted and separated. 
     A cleaner includes: a battery housing: a main terminal that is disposed in the battery housing; and a battery that is separably coupled to the battery housing, wherein the battery includes: a plurality of battery cells; a battery management unit to manage voltage of the plurality of battery cells; and a battery terminal that is connected to the battery management unit and is connected to the main body terminal when the battery is inserted into the battery housing, wherein the battery terminal includes: a first clip terminal that is elastically deformable and has a first contact portion; and a second clip terminal that is elastically deformable and has a second contact portion, the main body terminal is in contact with the first contact portion and the second contact portion between the first contact portion and the second contact portion, and the first contact portion and the second contact portion are spaced apart from each other in parallel with a coupling direction of the battery terminal and the main body terminal. 
     A cleaner includes: a battery housing: a main body terminal that is disposed in the battery housing; and a battery that is separably coupled to the battery housing, wherein the battery includes: a plurality of battery cells; a battery management unit to manage voltage of the battery cells; and a battery terminal that is connected to the battery management unit and is connected to the main body terminal when the battery is inserted into the battery housing, wherein the battery terminal includes a first clip terminal having a first contact portion and a second contact portion spaced apart from each other in a second direction crossing a first direction in which the battery is inserted into the battery housing; and a second clip terminal having a third contact portion and a fourth contact portion spaced apart from each other in the second direction crossing the first direction, the first contact portion and the second contact portion are spaced apart from each other in a third direction that is the arrangement direction of the first clip terminal and the second clip terminal, and the third contact portion and the fourth contact portions are spaced apart from each other in the third direction. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of a cleaner according to an embodiment of the present invention. 
         FIG. 2  is a side view of the cleaner according to an embodiment of the present invention. 
         FIG. 3  is a plan view of the cleaner according to an embodiment of the present invention. 
         FIG. 4  is a perspective view of the cleaner according to an embodiment of the present invention when seen from under the cleaner. 
         FIG. 5  is a vertical cross-sectional view of the cleaner according to an embodiment of the present invention. 
         FIG. 6  is a view when a battery according to an embodiment of the present invention has been separated from a battery housing. 
         FIG. 7  is a view when an inner housing according to an embodiment of the present invention has been separated from the battery housing. 
         FIG. 8  is a view after the inner housing shown in  FIG. 7  is coupled to the battery housing. 
         FIG. 9  is a perspective view of the battery according to an embodiment of the present invention. 
         FIG. 10  is a front view of the battery shown in  FIG. 9 . 
         FIG. 11  is an exploded perspective view of the battery according to an embodiment of the present invention. 
         FIG. 12  is a perspective view showing a battery holder of the present invention. 
         FIG. 13  is a plan view of the battery holder shown in  FIG. 12 . 
         FIG. 14  is a plan view of a second frame according to an embodiment of the present invention. 
         FIG. 15  is a plan view after a battery holder and battery cells are seated inside the second frame. 
         FIG. 16  is a perspective view of a barrier according to an embodiment of the present invention. 
         FIG. 17  is a perspective view showing the battery shown in  FIG. 9  with a first frame removed. 
         FIG. 18  is a horizontal cross-sectional view of the battery which shows the arrangement relationship between stop ribs of the first frame and a battery management unit. 
         FIG. 19  is a vertical cross-sectional view of the battery which shows the arrangement relationship between the stop ribs of the first frame and the battery management unit. 
         FIG. 20  is a view showing the battery shown in  FIG. 9  with a second frame removed. 
         FIG. 21  is a perspective view showing battery terminals according to an embodiment of the present invention. 
         FIG. 22  is a front view of one of the battery terminals of the present invention. 
         FIG. 23  is a cross-sectional view showing the battery inserted in the battery housing. 
         FIG. 24  is a view when a user has operated a first coupling portion and a second coupling portion to separate the battery from the battery housing. 
         FIG. 25  is a perspective view of battery terminals according to another embodiment of the present invention. 
         FIG. 26  is a view showing a battery according to another embodiment of the present invention inserted in a battery housing. 
         FIG. 27  is a view when the battery is separated from the battery housing in the state shown in  FIG. 26 . 
     
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     Hereinafter, some embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. It should be noted that when components in the drawings are designated by reference numerals, the same components have the same reference numerals as far as possible even though the components are illustrated in different drawings. Further, in description of embodiments of the present disclosure, when it is determined that detailed descriptions of well-known configurations or functions disturb understanding of the embodiments of the present disclosure, the detailed descriptions will be omitted. 
     Also, in the description of the embodiments of the present disclosure, the terms such as first, second, A, B, (a) and (b) may be used. Each of the terms is merely used to distinguish the corresponding component from other components, and does not delimit an essence, an order or a sequence of the corresponding component. It should be understood that when one component is “connected”, “coupled” or “joined” to another component, the former may be directly connected or jointed to the latter or may be “connected”, coupled” or “joined” to the latter with a third component interposed therebetween. 
       FIG. 1  is a perspective view of a cleaner according to an embodiment of the present invention,  FIG. 2  is a side view of the cleaner according to an embodiment of the present invention,  FIG. 3  is a plan view of the cleaner according to an embodiment of the present invention,  FIG. 4  is a perspective view of the cleaner according to an embodiment of the present invention when seen from under the cleaner, and  FIG. 5  is a cross-sectional view of the cleaner according to an embodiment of the present invention. 
     Referring to  FIGS. 1 to 5 , a cleaner  1  according to an embodiment of the present invention may include a main body  2 . 
     The cleaner  1  may further include a suction unit  5  coupled to the front of the main body  2 . The suction unit  5  can guide air containing dust into the main body  2 . 
     The cleaner  1  may further include a handle unit  3  coupled to the main body  2 . The handle unit  3  may be positioned opposite to the suction unit  5  on the main body  2 . 
     That is, the main body  2  may be disposed between the suction unit  5  and the handle unit  3 . 
     The main body  2  may include a first body  10  and a second body  12  on the first body  10 . The first body  10  and the second body  12  may be directly combined or may be indirectly combined through an intermediate member. 
     The first body  10  and the second body  12  may be, though not limited thereto, formed in a cylindrical shape. 
     The first body  10  and the second body  12  are open at the top and the bottom, respectively. That is, the bodies  10  and  12  may have a top opening and a bottom opening, respectively. 
     The suction unit  5  may be coupled to the main body  2  such that the center of the suction unit  5  is positioned approximately at the boundary between the first body  10  and the second body  12 . 
     The main body  2  may further include a dust separation unit that separates dust from air sucked through the suction unit  5 . 
     The dust separation unit may include a first cyclone unit  110  that can separate dust, for example, using cyclonic flow. The first body  10  includes the first cyclone unit  110  in this configuration. 
     The air and dust sucked through the suction unit  5  helically flow along the inner side of the first cyclone unit  110 . 
     The axis of the cyclonic flow in the first cyclone unit  110  may vertically extend. 
     The dust separation unit may further include a second cyclone unit  130  that secondarily separates dust from the air discharged out of the first cyclone unit  110 . The second cyclone unit  130  may be disposed inside the first cyclone unit  110  to minimize the size of the dust separation unit. The second cyclone unit  130  may include a plurality of cyclone bodies arranged in a row. 
     As another example, the dust separation unit may include one cyclone unit, in which the axis of the cyclonic flow may also vertically extend. 
     The first body  10  functions as a dust container that stores dust separated by the cyclone units  110  and  130 . 
     The main body  2  may further include a body cover  16  for opening/closing the bottom of the first body  10 . The body cover  16  can open/close the first body  10  by being rotated. A button  18  for rotating the body cover  16  may be disposed on the first body  10 . A hinge  162  of the body cover  16  may be coupled to hinge coupling portions  620  of the battery housing  60 . 
     At least a portion of the second cyclone unit  130  may be positioned inside the first body  10 . 
     A dust storage guide  124  that guides the dust separated by the second cyclone unit  130  to be stored may be disposed in the first body  10 . The dust storage guide  124  may be coupled to the bottom of the second cyclone unit  130  in contact with the top of the body cover  16 . 
     The dust storage guide  124  may divide the internal space of the first body  10  into a first dust storage part  121  where the dust separated by the first cyclone unit  110  is stored and a second dust storage part  123  where the dust separated by the second cyclone unit  130  is stored. 
     The internal space of the dust storage guide  124  is the second dust storage part  123  and the space between the dust storage guide  124  and the first body  10  is the first dust storage part  121 . 
     The body cover  16  can open/close both of the first dust storage part  121  and the second dust storage part  123 . 
     The cleaner  1  may further include a suction motor  20  for generating suction force and a battery  40  for supplying power to the suction motor  20 . 
     The suction motor  20  may be disposed in the second body  12 . At least a portion of the suction motor  20  may be disposed over the dust separation unit. Accordingly, the suction motor  20  is disposed over the first body  10 . 
     The suction motor  20  may communicate with an outlet of the second cyclone unit  130 . 
     To this end, the main body  2  may further include a discharge guide  28  connected to the second cyclone unit  130  and a flow guide  22  that communicates with the discharge guide  28 . 
     For example, the discharge guide  28  is disposed on the second cyclone unit  130  and the flow guide  22  is disposed over the discharge guide  28 . 
     Further, at least a portion of the suction motor  20  is positioned inside the flow guide  22 . 
     Accordingly, the axis of the cyclonic flow in the first cyclone unit  110  may pass through the suction motor  20 . 
     When the suction motor  20  is disposed over the second cyclone unit  130 , the air discharged from the second cyclone unit  130  can flow directly to the suction motor  20 , so the channel between the dust separation unit and the suction motor  20  can be minimized. 
     The suction motor  20  may include a rotary impeller  200 . The impeller  200  may be fitted on a shaft  202 . The shaft  202  is vertically disposed. 
     An extension line from the shaft  202  (which may be considered as the rotational axis of the impeller  200 ) may pass through the first body  10 . The rotational axis of the impeller  200  and the axis of the cyclonic flow in the first cyclone unit  180  may be on the same line. 
     According to the present invention, there is the advantage that the path through which the air discharged from the dust separation unit, that is, the air discharged upward from the second cyclone unit  130  flows to the suction motor  20  can be reduced and a change in direction of air can be decreased, so a loss of airflow can be reduced. 
     As the loss of airflow is reduced, suction force can be increased and the lifetime of the battery  40  for supplying power to the suction motor  20  can be increased. 
     The cleaner  1  may further include an upper motor housing  26  covering a portion of the top of the suction motor  20  and a lower motor housing  27  covering a portion of the bottom of the suction motor  20 . 
     The suction motor  20  may be disposed inside the motor housings  26  and  27  and the flow guide  22  may be disposed to cover the upper motor housing  26 . 
     At least a portion of the flow guide  22  may be spaced apart from the upper motor housing  26 . Further, at least a portion of the flow guide  22  may be spaced apart from the second body  12 . 
     Accordingly, a first air passage  232  is defined by the inner side of the flow guide  22  and the outer side of the upper motor housing  26  and a second air passage  234  is defined by the outer side of the flow guide  22  and the inner side of the second body  12 . 
     The air discharged from the second cyclone unit  130  flows to the suction motor  20  through the first air passage  232  and the air discharged from the suction motor  20  flows through the second air passage  234  and is then discharged outside. Accordingly, the second air passage  234  functions as an exhaust channel. 
     The handle unit  3  may include a handle  30  for a user to hold and a battery housing  60  under the handle  30 . 
     The handle  30  may be disposed behind the suction motor  20 . 
     As for directions, with respect to the suction motor  20  in the cleaner  1 , the direction in which the suction unit  5  is positioned is the front direction and the direction in which the handle  30  is positioned is the rear direction. 
     The battery  40  may be disposed behind the first body  10 . Accordingly, the suction motor  20  and the battery  40  may be arranged not to vertically overlap each other and may be disposed at different heights. 
     According to the present invention, since the suction motor  20  that is heavy is disposed ahead of the handle  30  and the battery  40  that is heavy is disposed behind the handle  30 , so weight can be uniformly distributed throughout the cleaner  1 . It is possible to prevent injuries to the user&#39;s wrist when a user cleans with the handle  30  in his/her hand. That is, since the heavy components are distributed at the front and rear portions and at different heights in the cleaner  1 , it is possible to prevent the center of gravity of the cleaner  1  from concentrating on any one side. 
     Since the battery  40  is disposed under the handle  30  and the suction motor  20  is disposed in front of the handle  30 , there is no component over the handle  30 . That is, the top of the handle  30  forms a portion of the external appearance of the top of the cleaner  1 . 
     Accordingly, it is possible to prevent any component of the cleaner  1  from coming in contact with the user&#39;s arm while the user cleans with the handle  30  in his/her hand. 
     The handle  30  may include a first extension  310  extending vertically to be held by a user and a second extension  320  extending toward the suction motor  20  over the first extension  310 . The second extension  320  may at least partially horizontally extend. In the present invention, the first extension  310 , which is a portion that a user can hold (a portion that a user&#39;s palm can come in contact with), may be referred to as a grip part. 
     A stopper  312  for preventing a user&#39;s hand holding the first extension  310  from moving in the longitudinal direction of the first extension  310  (vertically in  FIG. 2 ) may be formed on the first extension  310 . The stopper  312  may extend toward the suction unit  5  from the first extension  310 . 
     The stopper  312  is spaced apart from the second extension  320 . Accordingly, a user is supposed to hold the first extension  310 , with some of the fingers over the stopper  312  and the other fingers under the stopper  312 . 
     For example, the stopper  312  may be positioned between the index finger and the middle finger. 
     According to this arrangement, when a user holds the first extension  310 , the longitudinal axis A 1  of the suction unit  5  may pass through the user&#39;s wrist. 
     When the longitudinal axis A 1  of the suction unit  5  passes through the user&#39;s wrist and the user&#39;s arm is stretched, the longitudinal axis A 1  of the suction unit  5  may be substantially aligned with the user&#39;s stretched arm. Accordingly, there is the advantage in this state that the user uses minimum force when pushing or pulling the cleaner  1  with the handle  30  in his/her hand. 
     The handle  30  may include an operation unit  326 . For example, the operation unit  326  may be disposed on an inclined surface of the second extension  320 . It is possible to input instructions to turn on/off the cleaner (suction motor) through the operation unit  326 . For example, it is possible to input instructions to turn on/off the suction motor through the operation unit  326 . Further, it is possible to control the intensity of the suction force of the suction motor  20  that has been turned on through the operation unit  326 . 
     The operation unit  326  may be disposed to face a user. The operation unit  326  may be disposed opposite to the stopper  312  with the handle  30  therebetween. 
     The operation unit  326  is positioned higher than the stopper  312 . Accordingly, a user can easily operate the operation unit  326  with his/her thumb with the first extension  310  in his/her hand. 
     Further, since the operation unit  326  is positioned outside the first extension  310 , it is possible to prevent the operation unit  326  from being unexpectedly operated when a user cleans with the first extension  310  in his/her hand. 
     A display unit  322  for showing operational states may be disposed on the second extension  320 . The display unit  322  may be, for example, disposed on the top of the second extension  320 . Accordingly, a user can easily check the display unit  322  on the top of the second extension  320  while cleaning. The display  322 , for example, can show the remaining capacity of the battery  40  and the intensity of the suction motor. 
     The display unit  322 , though not limited, may include a plurality of light emitting devices. The light emitting devices may be spaced apart from each other in the longitudinal direction of the second extension  320 . 
     The battery housing  60  may be disposed under the first extension  310 . 
     The battery  40  may be detachably combined with the battery housing  60 . For example, the battery  40  may be inserted into the battery housing  60  from under the battery housing  60 . 
     The rear side of the battery housing  60  and the rear side of the first extension  310  may form a continuous surface. Accordingly, the battery housing  60  and the first extension  310  can be shown like a single unit. 
     When the battery  40  is inserted in the battery housing  60 , the bottom of the battery  40  may be exposed to the outside. Accordingly, when the cleaner  1  is placed on the floor, the battery  40  can be in contact with the floor. 
     According to this structure, there is the advantage that the battery  40  can be directly separated from the battery housing  60 . 
     Further, since the bottom of the battery  40  is exposed to the outside, the bottom of the battery  40  can come in direct contact with the air outside the cleaner  1 , so the battery  40  can be more efficiently cooled. 
     Referring to  FIG. 3 , the cleaner  1  may further include a filter unit  50  having air exits  522  for discharging the air that has passed through the suction motor  20 . For example, the air exits  522  may include a plurality of openings and the openings may be circumferentially arranged. Accordingly, the air exist  522  may be arranged in a ring shape. 
     The filter unit  50  may be detachably coupled to the top of the main body  2 . The filter unit  50  may be detachably inserted in the second body  12 . 
     When the filter unit  50  is combined with the main body  2 , a portion of the filter unit  50  is positioned outside the second body  12 . Accordingly, a portion of the filter unit  50  is inserted in the main body  2  through the open top of the main body  2  and the other portion protrudes outside from the main body  2 . 
     The height of the main body  2  may be substantially the same as the height of the handle  30 . Accordingly, the filter unit  50  protrudes upward from the main body  2 , so a user can easily hold and separate the filter unit  50 . 
     When the filter unit  50  is combined with the main body  2 , the air exits  522  are positioned at the upper portion of the filter unit  50 . Accordingly, the air discharged from the suction motor  20  is discharged upward from the main body  2 . 
     According to this embodiment, it is possible to prevent the air discharged from the air exits  522  from flowing to a user while the user cleans using the cleaner  1 . 
     The main body  2  may further include a pre-filter  29  for filtering the air flowing into the suction motor  20 . The pre-filter  29  may be disposed inside the flow guide  22 . Further, the pre-filter  29  is seated over the upper motor housing  26  and may surround a portion of the upper motor housing  26 . That is, the upper motor housing  26  may include a filter support for supporting the pre-filter  29 . 
       FIG. 6  is a view when a battery according to an embodiment of the present invention has been separated from a battery housing,  FIG. 7  is a view when an inner housing according to an embodiment of the present invention has been separated from the battery housing, and  FIG. 8  is a view after the inner housing shown in  FIG. 7  is coupled to the battery housing. 
       FIG. 9  is a perspective view of the battery according to an embodiment of the present invention and  FIG. 10  is a front view of the battery shown in  FIG. 9 . 
     Referring to  FIGS. 6 to 10 , the battery housing  60  may include an outer housing  600  that is integrally formed with the handle  30  and an inner housing  610  that can be inserted in the outer housing  600 . 
     The inner housing  610  may be inserted a lower side of the outer housing  600 . The inner housing  610  provides a battery chamber  611  for receiving the battery  40 . 
     The inner housing  610  may be fixed to one or more of the outer housing  600  and the first body  10 . Further, the battery  40  may be coupled to the inner housing  610 . 
     According to the present embodiment, the inner housing  610  is inserted into the outer housing  600  and then the battery  40  is inserted to be coupled to the inner housing  610 , so it is possible to prevent the outer housing  600  from deforming or to prevent the outer housing  600  from being damaged when inserting or separating the battery  40 . 
     Obviously, it may be possible to integrally form the inner housing  610  with the outer housing  600  without separately forming the inner housing  610 . 
     The inner housing  610  may have a pair of hinge coupling portions  620  to which a hinge  162  of the body cover  16  is coupled. The hinge coupling portions  620  may be spaced at a predetermined distance from each other. Accordingly, a space  622  may be formed between the hinge coupling portions  620 . 
     The inner housing  610  may further include a body fastening portion  642  to be fastened to the first body  10 . 
     The inner housing  610  may further include first main body terminals  630  for charging the battery  40  coupled to the inner housing  610 . It is possible to bring charging stand terminals in contact with the first main body terminals  630  by placing the cleaner  1  on a charging stand (not shown). 
     The first main body terminals  630  are disposed on the bottoms of the hinge coupling portions  620 , but can be spaced apart from the floor when the cleaner  1  is placed on the floor. That is, terminal grooves  623  that are concave upward are formed on the bottoms of the hinge coupling portions  620  and the first main body terminals  630  can be disposed in the terminal grooves  623 . Accordingly, damage to the first main body terminals  630  can be prevented. 
     Further, since the first main body terminals  630  are disposed in the terminal grooves  623 , water cannot come in contact with the first main body terminals  630  when the cleaner  1  is placed on a floor. 
     The battery  40  may include a frame  410  that forms the external shape. The frame  410  and the battery chamber  611  may be formed in shapes corresponding to each other. 
     The battery  40  may further include a plurality of coupling portions  470  and  474 . The coupling portions  470  and  474  may include a first coupling portion  470  disposed on a first side of the frame  410  and a second coupling portion  474  disposed on a second side of the frame  410 . The first coupling portion  470  and the second coupling portion  474 , for example, may be positioned opposite to each other. 
     The first coupling portion  470  may include a first hook  472 . The first coupling portion  470  may be movably coupled to the outer side of the frame  410 . The first coupling portion  470  can be elastically supported by an elastic member  473  (see  FIG. 23 ) in the frame  410 . 
     A locking rib  640  for locking the first hook  472  of the first coupling portion  470  may be formed between the hinge coupling portions  620 . 
     While the battery  40  is coupled, the first hook  472  of the first coupling portion  470  can be locked to the locking rib  640  through the space  622 . 
     The second coupling portion  474  is integrally formed with the frame  410  and can be elastically deformed by external force. 
     In detail, an extension  475  horizontally extends from the bottom of the frame  410  and the second coupling portion  474  extends upward from the end of the extension  475 . The second coupling portion  474  is spaced from the outer side of the frame  410  by the extension  475 . 
     That is, a space for deformation is defined between the frame  410  and the second coupling portion  474 . The second coupling portion  474  can be elastically deformed toward the frame  410  by the space. 
     The second coupling portion  474  may include a second hook  476 . The second hook  476  may be thinner than other portion of the second coupling portion  474 . 
     The outer housing  600  has a first exposing hole  602  and the inner housing  610  has a second exposing hole  612  to expose the second coupling portion  474  to the outside so that the second coupling portion  474  can be operated with the battery  40  in the battery chamber  611 . 
     Further, a coupling slot  614  for coupling the second hook  476  of the second coupling portion  474  may be formed over the second exposing hole  612  of the inner housing  610 . The coupling slot  614  may be a hole or a groove. 
     The second hook  476  of the second coupling portion  474  can be inserted into the locking slot  614  when being inserted in the inner housing  610 . 
       FIG. 11  is an exploded perspective view of the battery according to an embodiment of the present invention,  FIG. 12  is a perspective view showing a battery holder of the present invention, and  FIG. 13  is a plan view of the battery holder shown in  FIG. 12 . 
     Referring to  FIGS. 10 to 13 , the battery  40  may further include a plurality of battery cells  430 , a battery holder  440  supporting the battery cells  430 , a battery management unit  480  managing the voltage of the battery cells  430 , and battery terminals  490  connected to the battery management unit  480 . 
     The battery cells  430 , the battery holder  440 , and the battery management unit  480  may be covered by the frame  410 . 
     The battery  40  may further include a barrier  450  disposed between the battery cells  430  and the battery management unit  480 . 
     The barrier  450  blocks heat transferring from the battery cells  430  to the battery management unit  480 . 
     The frame  410  may include a first frame  420  and a second frame  460  coupled to the lower portion of the first frame  420 . 
     A protrusion  422  is formed on the top of the first frame  420  and terminal holes  424  through which second main body terminals  670  (see  FIG. 23 ) to be described below pass may be formed in the protrusion  422 . 
     The terminal holes  424  are formed through the top of the protrusion  422 . Accordingly, while the battery  40  is inserted upward into the battery hosing  60 , the second main body terminals  670  (see  FIG. 23 ) can be connected to the battery terminals  490  through the terminal holes  424 . 
     The protrusion  422  may be positioned at a side from the center of the first frame  420  so that a user can easily recognize the direction in which the battery  40  is inserted into the battery housing  60 . For example, the protrusion  422  may be positioned closer to the second coupling portion  474  between the first coupling portion  470  and the second coupling portion  474 . 
     A seat  461  in which the lower end of the first frame  410  is seated may be formed at the top of the second frame  460 . 
     The battery management unit  480  may be coupled to the top of the barrier  450 . The battery management unit  480  may include one or more fastening holes  482  to be fastened to the barrier  450  by fasteners. 
     The battery holder  440  allows the battery cells  430  to be arranged in erected positions. For example, the longitudinal direction of the battery cells  430  may be in parallel with the directions in which the battery  40  is inserted into and separated from the battery housing  60 . 
     The battery holder  440  allows the battery cells  430  to be arranged in a plurality of rows. 
     For example, the battery cells  430 , though not limited, may include seven battery cells and the battery holder  440  may allow some of the seven battery cells to be arranged in two rows. However, it should be noted that the number of the battery cells  430  is not limited. 
     The battery holder  440  may have a separation wall  441  for dividing the battery cells  430  in two separate rows, first holders  442  formed at the upper portion of the separation wall  441 , and second holders  445  formed at the lower portion of the separation wall  441 . 
     The first holders  442  surround the upper portions of the battery cells  430  and the second holder  445  surround the lower portions of the battery cells  430 . 
     The first holders  442  and the second holders  445  are vertically spaced from each other. 
     According to this configuration of the present embodiment, there is an advantage in that even if the battery cells  430  in any one of the two rows ignite, the battery cells  430  in the other row are prevented from being ignited by the separation wall  441 . 
     Further, heat generated by the battery cells  430  in the two rows can be prevented from influencing each other in other rows by the separation wall  441 . 
     The structure and shape of the second holders  445  are the same as those of the first holders  442 , so hereafter, only the first holders  442  are described in detail and the description of the first holders  442  is referred to for the structure and shape of the second holders  445 . 
     The first holders  442  may include cell cases  442   a ,  442   b ,  443   a ,  443   b , and  443   c  that surround the upper portions of the battery cells  430 . 
     The battery cells  430  are spaced from each other with the upper portions surrounded by the cell cases  442   a ,  442   b ,  443   a ,  443   b , and  443   c.    
     The cell cases  442   a ,  442   b ,  443   a ,  443   b , and  443   c  may include first cell cases  442   a  and  442   b  that surround the entire outer sides of some of the battery cells  430 , second cell cases  443   a  and  443   b  that partially surround the outer sides of some of the battery cells  430 , and a third cell case  443   c  disposed between the two cell cases  443   a  and  443   b.    
     For example, the first cell cases  442   a  and  442   b  may be formed in a cylindrical shape, and the second cell cases  443   a  and  443   b  and the third cell case  443   c  may be formed in a C-shape having an opening  443   d.    
     In detail, two first cell cases  442   a  and  442   b  are in contact with each other, in which any one first cell case  442   a  surrounds a battery cell  430  in the first row and the other first cell case  442   b  surround a battery cell  430  in the second row. 
     Further, two second cell cases  443   a  and  443   b  may be horizontally spaced from each other with the separation wall  441  therebetween and may be connected to connectors  444   a  and  444   b.    
     The connectors  444   a  and  444   b  may include a first connector  444   a  vertically connecting the two second cell cases  443   a  and  443   b  and a second connector  444   b  horizontally extending and connecting the two second cell cases  443   a  and  443   b . The second connector  444   b  may be in contact with the upper portion of the separation wall  441 . 
     By the connectors  444   a  and  444   b , not only two spaced second cell cases  443   a  and  443   b  are connected, but the strength is improved. 
     The distance between the centers of the two second cell cases  443   a  and  443   b  is longer than the distance between the centers of the two first cell cases  442   a  and  442   b.    
     The first cell cases  442   a  and  442   b  may be disposed between two groups of second cell cases  443   a  and  443   b.    
     That is, a second cell case, a first cell case, and a second cell case may be sequentially arranged. According to this arrangement, the battery cells  430  can be arranged in a zigzag pattern in each row, so the horizontal length of the battery  40  can be reduced. 
     Since the battery cells  430  are arranged in a zigzag pattern, even if the number of the battery cells  430  is increased, the size of the battery  40  is not increased not that much, so the maximum chargeable voltage of the battery  40  can be increased. 
     Further, even if two second cell case  443   a  and  443   b  are spaced from each other with the separation wall  441  therebetween, the two second cell cases  443   a  and  443   b , so the size of the first holder  442  can be reduced, thus the size of the frame  410  can be reduced. 
     The third cell case  443   c  is disposed between two spaced second cell cases  443   a  and  443   b . Therefore, according to the present invention, the horizontal length of the battery  40  can be reduced. 
       FIG. 14  is a plan view of a second frame according to an embodiment of the present invention and  FIG. 15  is a plan view after the battery holder and the battery cells are seated inside the second frame. 
     Referring to  FIGS. 14 and 15 , the second frame  460  may have a support flange  462  for supporting the lower ends of the inner housing  610  and the outer housing  600  with the battery  40  inserted in the battery housing  60 . 
     The support flange  462  may horizontally extend outward from the bottom of the second frame  460 . 
     A coupling body  479  for coupling the first coupling portion  470  is formed on one side around the second frame  460  and the second coupling portion  474  is formed on another side around the second frame  460 . 
     The second frame  460  may further include contact ribs  463 ,  464 , and  465  being in contact with the battery cells  430  retained in the battery holder  440 . 
     The contact ribs  463 ,  464 , and  465  prevent horizontal movement of the battery cells  430  in the frame  410  in contact with the battery cells  430 . 
     The contact ribs  463 ,  464 , and  465  may include first contact ribs  463  disposed at corners of the second frame  460 , second contact ribs  464  being in contact with the battery cells  430  in the second cell cases  443   a  and  443   b  disposed between the first cell cases  442   a  and  442   b  and the third cell case  443   c , and a third contact rib  465  being in contact with the battery cell  430  in the third cell case  443   c.    
     As described above, since the second cell cases  443   a  and  443   b  and the third cell case  443   c  have the openings  443   d , when the battery cells  430  are fitted in the second cell cases  443   a  and  443   b  and the third cell case  443   c , the battery cells  430  are partially exposed to the outside, and accordingly, the contact ribs  463 ,  464 , and  465  can come in contact with the battery cells  430 . 
     The contact ribs  463 ,  464 , and  465  may be rounded with a curvature corresponding to the curvature of the outer sides of the battery cells  430  to stably in contact with the battery cells  430 . 
     When the battery holder  440  is disposed inside the second frame  460 , a portion of the battery holder  440  may be spaced apart from the second frame  460 . Accordingly, the space between the battery holder  440  and the second frame  460  functions as a heat dissipation space for heat from the battery cells  430  to be naturally dissipated. 
       FIG. 16  is a perspective view of the barrier according to an embodiment of the present invention,  FIG. 17  is a perspective view showing the battery shown in  FIG. 9  with a first frame removed,  FIG. 18  is a horizontal cross-sectional view of the battery which shows the arrangement relationship between stop ribs of the first frame and a battery management unit, and  FIG. 19  is a vertical cross-sectional view of the battery which shows the arrangement relationship between the stop ribs of the first frame and the battery management unit. 
     Referring to  FIGS. 16 to 19 , the barrier  450  may include a flat plate  451 . 
     The plate  451  is disposed over the battery cell  430  to block heat transferring from the battery cell  430  to the battery management unit  480 . 
     The barrier  450  may further include an outer rib  452  protruding upward along the edge of the plate  451 . The outer rib  452  increases the strength of the barrier  450 . 
     The battery management unit  480  may include a circuit board  481  and the battery terminals  490  may be directly formed on the circuit board  481 . Pin holes  483  through which terminal connection pins to be described below pass may be formed at the battery management unit  480 . 
     The circuit board  481  may be coupled to the barrier  450  over the plate  451 . The circuit board  481  and the plate  451  are arranged in parallel and spaced from each other. 
     The longitudinal direction of the battery cell  430  may cross the circuit board  481  and the plate  451 . 
     While the battery  40  is inserted into the battery housing  60 , the second main body terminals  670  (see  FIG. 23 ) are coupled to the battery terminals  490 . When the second main body terminals  670  (see  FIG. 23 ) are coupled to the battery terminals  490 , a downward force may be applied to the battery terminals  490 . The pressure applied to the battery terminals  490  may be transmitted to the circuit board  481  and the circuit board  481  is spaced apart from the plate  451 , so when the circuit board  481  is pressed down, the circuit board  481  can be deformed, and in this case, the circuit board  481  may be broken. 
     In the present embodiment, the barrier  450  may further include an anti-deformation rib  453  extending toward the circuit board  481  from the plate  451  and preventing deformation of the battery management unit  480  in order to prevent breakage of the circuit board  481 . 
     When the circuit board  481  is combined with the barrier  450 , the anti-deformation rib  453  may be in contact with the circuit board  481 , adjacent to the pin holes  483  of the circuit board  481 . 
     Further, when the battery terminals  490  and the second main body terminals  670  (see  FIG. 23 ) are separated, the anti-deformation rib  453  may be in contact with the circuit board  481 . 
     Alternatively, the anti-deformation rib  453  may be disposed close to the circuit board  481 , and it may be brought in contact with the bottom of the circuit board  481  when the circuit board  481  is pressed down. 
     The anti-deformation rib  453  may be spaced apart from the circuit board  481  when the second main body terminals  670  (see  FIG. 23 ) is separated from the battery terminals, and it may be in contact with the circuit board  481  when the second main body terminals  670  (see  FIG. 23 ) are coupled to the battery terminals  490 . 
     The barrier  450  may further include one or more fastening bosses  454  to be fastened to the circuit board  481  by fasteners. The fastening bosses  454  may extend upward on the plate  451 . 
     The fastening bosses  454  may be positioned inside the outer rib  452  and may be formed integrally with the outer rib  452 . 
     The fastening bosses  454  protrude higher than the outer rib  452  from the plate  451  so that the outer rib  452  and the circuit board  481  can be spaced from each other when the barrier  450  and the circuit board  481  are fastened. 
     The plate  451  may include a guide hole  455  through which a first top conductive plate  433  passes and guide grooves  457  for guiding second top conductive plates  433   a . The guide hole and grooves  455  and  457  guide the top conductive plates  433  and  433   a  to the circuit board  481 , so they may be referred to as, in combination, a first guide. 
     The circuit board  481  may also include a guide hole  485  (or it may be referred to as a second guide) through which the first conductive plate  433  passes. 
     Though not shown in the figures, the anodes (+) and the cathodes (−) of two adjacent battery cells of the battery cells  430  may be connected through a conductor. The conductive plates  433  and  433   a  may be connected to the conductor connecting the two battery cells  430 . 
     For example, since seven battery cells are provided in the present invention, three conductors may connect the anodes (+) and the cathodes (−) of two battery cells and one conductor may be connected to one electrode (anode (+) or cathode (−)) of one battery cell, over the battery cells. 
     The first top conductive plate  433  may be connected to the top of the circuit board  481  through the guide holes  485  of the plate  451  and the circuit board  481 . 
     The second top conductive plates  433   a  may be guided upward along the guide grooves  457  and then bent horizontally, whereby they can be connected to the top of the circuit board  481 . 
     Since the conductive plates  433  and  433   a  are connected to the circuit board  481 , the battery management unit  480  can manage the voltage of the battery cells  430 . 
     The plate  451  may include guide projections  459  for guiding the circuit board  481  when it is combined with the circuit board  481 . The guide projection  459  may protrude upward from the plate  451 . The guide projections  459  may protrude higher than the outer rib  452  to be able to pass through the circuit board  481 . 
     Projection holes  489  through which the guide projections  459  pass may be formed at the circuit board  481 . 
     On the other hand, the first frame  420  may include a plurality of stop ribs for preventing moment of the barrier and the battery management unit  480  inside the first frame  420 . 
     The stop ribs may protrude from the inner side of the first frame  420 . The stop ribs may include a first stop rib  427  and a second stop rib  428 . 
     The circuit board  481  may include a rib slot  488  through which the first stop rib  427  passes and the barrier  450  may include a rib seat  458  in which the first stop rib  427  passing through the rib slot  488  is seated. 
     When the first stop rib  427  is seated in the rib seat  458 , the first stop rib  427  may be seated on the plate  451 . The second stop rib  428  may be seated on the outer rib  452 . 
     When the first stop rib  427  is seated in the rib seat  458  through the rib slot  488  and the second stop rib  428  is seated on the outer rib  452 , not only horizontal movement, but upward movement of the barrier  450  and the battery management unit  480  are restricted. 
       FIG. 20  is a view showing the battery shown in  FIG. 9  with the second frame removed. 
     Referring to  FIGS. 19 and 20 , a plurality of first bottom conductors  437  may connect the anodes (+) and the cathodes (−) of two battery cells  430  under the battery cells  430 . 
     For example, since seven battery cells are provided in the present invention, three first bottom conductors  437  may connect the anodes (+) and the cathodes (−) of two battery cells and one second bottom conductor  437   a  may be connected to one electrode (anode (+) or cathode (−)) of one battery cell, under the battery cells. 
     First bottom conductive plates  438  may be connected to the first bottom conductors  437 . For example, the first bottom conductive plats  438  may be integrally formed with the first bottom conductors  437  and may be bent upward from the first bottom conductors  437 . 
     Second bottom conductive plates  438   a  may be connected to the second bottom conductors  437   a . For example, the second bottom conductive plats  438   a  may be integrally formed with the second bottom conductors  437   a  and may be bent upward from the second bottom conductors  437   a.    
     Wires  436  may be connected to the bottom conducive plates  438  and  438   a . The wires  436  may be connected to the circuit board  481 . 
     The barrier  450  may include wire grooves  456  in which the wires  436  are seated and the circuit board  481  may include wire holes  486  through which the wires  436  pass. 
     In the present invention, the wire grooves  456  may be referred to as first wire guides and the wire holes  486  may be referred to as second wire guide. 
       FIG. 21  is a perspective view showing the battery terminals according to an embodiment of the present invention and  FIG. 22  is a front view of a battery terminal of the present invention. 
     Referring to  FIGS. 17, 21, and 22 , a pair of battery terminals  490  may be directly disposed on the circuit board  481 . 
     The battery terminals  490  may be erected on the circuit board  481 . The battery terminals  490  may be partially or fully disposed in the protrusion  422  of the frame  410 . 
     Accordingly, while the battery  40  is vertically inserted into the battery housing  60 , the second main body terminals  670  (see  FIG. 23 ) can be coupled to the battery terminals  490 . 
     The battery terminals  490  each may have a base  491  to be installed on the circuit board  481 . 
     The base  491  may include a plurality of installation pins  491   a ,  491   b , and  491   c  passing through the pin holes  483  of the circuit board  481 . 
     The installation pins  491   a ,  491   b , and  491   c  may include a first pin  491   a  and a second pin  491   b  spaced from each other. The first pin  491   a  and the second pin  491   b  may be arranged to face each other. 
     The installation pins  491   a ,  491   b , and  491   c  may include a third pin  491   c  disposed to cross the first pin  491   a  and the second pin  491   b  in an area corresponding to the area between the first pin  491   a  and the second pin  491   b.    
     When the battery terminals  490  are installed on the circuit board  481  and the circuit board  481  is installed over the barrier  450 , the anti-deformation rib  453  of the barrier  450  may be positioned in an area between a line connecting the first pin  491   a  and the second pin  491   b , and the third pin  491   c    
     Accordingly, it is possible to effectively prevent deformation of the circuit board  481  when the battery terminals  490  and the second main body terminals  670  (see  FIG. 23 ) are combined. 
     The battery terminals  490  each may have a pair of clip terminals  492  and  493  extending upward from the base  491 . 
     The clip terminals  492  and  493  may include a first clip terminal  492  and a second clip terminal  493 . 
     The first clip terminal  492  and the second clip terminal  493  can be elastically deformed on the base  491  and the second main body terminal  670  (see  FIG. 23 ) are in contact with the first clip terminal  492  and the second clip terminal  493  between the first clip terminal  492  and the second clip terminal  493 . 
     In order for the clip terminals  492  and  493  can be elastically deformed and the second main body terminal  670  (see  FIG. 23 ) is positioned between the clip terminals  492  and  493 , the clip terminals  492  and  493  may extend toward each other, as they go upward, and then extend away from each other at a predetermined height. 
     Accordingly, as the extension directions of the clip terminals  492  and  493  are changed, the clip terminals  492  and  493  may have contact portions  497   a  and  497   b , respectively. That is, the first clip terminal  492  may have a first contact portion  497   a  and the second clip terminal  493  may have a second contact portion  497   b.    
     In order to improve contact reliability between the contact portions  497   a  and  497   b  of the clip terminals  492  and  493  and the second main body terminal  670  (see  FIG. 23 ), a cut portion  494   a  and  494   b  for dividing the clip terminals  492  and  493  into a plurality of independent terminals, respectively, may be formed at the clip terminals  492  and  493 . 
     When the cut portions  494   a  and  494   b  are formed at the clip terminals  492  and  493  in the present invention, the number of independent terminals of the clip terminals  492  and  493  is increased, so the reliability in contact with the second main body terminal  670  (see  FIG. 23 ) is improved, but the contact area with the second main body terminal  670  (see  FIG. 23 ) is decreased, so a short circuit may occur when a current is high. 
     Accordingly, the clip terminals  492  and  493  each have two independent terminals  495   a ,  495   b ,  496   a , and  496   b  horizontally spaced from each other by the cut portions  494   a  and  494   b , respectively. 
     The first clip terminal  492  includes a first independent terminal  495   a  and a second independent terminal  495   b  and the second clip terminal  403  includes a third independent terminal  496   a  and a fourth independent terminal  496   b.    
     The independent terminals  495   a ,  495   b ,  496   a , and  496   b  have contact portions  497   a  and  497   b , respectively. Accordingly, the clip terminals each have two contact portions  497   a  and  497   b  in the present invention. 
     In order to improve contact reliability between the contact portions  497   a  and  497   b  of the clip terminals  492  and  493  and the second main body terminal  670  (see  FIG. 23 ), the first contact portion  497   a  of the first clip terminal  492  and the second contact portion  497   b  of the second clip terminal  493  may be spaced from each other in parallel with the coupling direction of the second main body terminal  670  (see  FIG. 23 ). 
     That is, the first contact portion  497   a  and the second contact portion  497   b  may be arranged not to face each other. 
     In the present invention, for example, the first contact portion  497   a  and the second contact portion  497   b  may be vertically spaced from each other. 
     The horizontal gap between the first contact portion  497   a  and the second contact portion  497   b  is smaller than the thickness of the second main body terminal  670  (see  FIG. 23 ) and the gap may not be provided. 
     When the gap is not provided, it means that a virtual line connecting the first contact portion  497   a  and the second contact portion  497   b  is a vertical line. 
     Alternatively, the first contact portion  497   a  and the second contact portion  497   b  may be arranged to vertically overlap each other. 
     According to the present invention, even if the battery  40  is frequently inserted in the battery housing  60  and thus the first clip terminal  492  and the second clip terminal  493  are deformed away from each other, whereby the restoring force is reduced, the gap between the first contact portion  497   a  and the second contact portion  497   b  can be kept smaller than the thickness of the second main body terminal  670  (see  FIG. 23 ), so the contact reliability can be improved. 
       FIG. 23  is a cross-sectional view showing the battery inserted in the battery housing and  FIG. 24  is a view when a user has operated a first coupling portion and a second coupling portion to separate the battery from the battery housing. 
     Referring to  FIGS. 23 and 24 , the battery housing  60  may have the receiving portion  660  for receiving the protrusion  422 . The receiving portion  660  may have second main body terminals  670  for coupling to the battery terminals  490 . 
     In this embodiment, since the second main body terminals  660  are inserted through the terminal holes  424  when the protrusion  422  is inserted into the receiving portion  670 , the receiving portion  670  guides the protrusion  422  moving upward so that the second main body terminals  670  can be stably inserted through the terminal holes  424 . 
     In order to separate the battery from the battery housing  60 , a user can insert fingers into the space  622  defined between the hinge coupling portions  620 . 
     Further, the user can press the first coupling portion  470  toward the frame  410  with the finger. Accordingly, the elastic member  473  contracts and the first hook  472  of the first coupling portion  470  is unlocked from the locking rib  640 . 
     Further, the user can unlock the second coupling portion  474  from the battery housing  60  by operating the second coupling portion  474  exposed to the outside of the battery housing  60 . 
     In detail, the user presses the second coupling portion  474  toward the frame  410 . Accordingly, the second coupling portion  474  is bent toward the frame  410  by the space between the frame  410  and the second coupling portion  474 . Therefore, the second hook  476  is pulled out of the coupling slot  614 . 
     As a result, the first coupling portion  470  and the second coupling portion  474  are moved toward each other by a user, whereby they are unlocked. 
     Accordingly, a user can unlock the first coupling portion  470  and the second coupling portion  474  using two fingers, so the user can easily separate the battery  40  downward from the battery housing  60 . 
     According to the present invention, since the battery  40  can be separated from the battery housing  60 , it is possible to place only the battery  40  on the cradle to charge it. 
       FIG. 25  is a perspective view of battery terminals according to another embodiment of the present invention. 
     The battery terminals of this embodiment are the same as those shown in  FIG. 21 , except for the positions of the contact portions of the independent terminals. Accordingly, only characteristic parts of this embodiment are described hereafter. 
     Referring to  FIG. 25 , the battery terminals of this embodiment each may have a base  490   a  and a first clip terminal and a second clip terminal that extend from the base  490   a.    
     The first clip terminal may have a first independent terminal  701  and a second independent terminal  702  and the second clip terminal may have a third independent terminal  703  and a fourth independent terminal  704 . 
     The first independent terminal  701  and the second independent terminal  702  are spaced from each other in a second direction (in the direction of an arrow A) that crosses a first direction in which the battery  40  is inserted into the battery housing  60 . 
     The third independent terminal  703  and the fourth independent terminal  704  are spaced from each other in the second direction. 
     The first independent terminal  701  may have a first contact portion  701   a  and the second independent terminal  702  may have a second contact portion  702   a  positioned at the same height as the first contact portion  701   a.    
     The third independent terminal  703  may have a third contact portion  703   a  positioned at a different height from the first contact portion  701   a  and the fourth independent terminal  704  may have a fourth contact portion  704   a  positioned at the same height as the third contact portion  703   a.    
     The second contact portion  702   a  may be positioned in an area corresponding to the area between the first contact portion  701   a  and the third contact portion  703   a . The third contact portion  703   a  may be positioned in an area corresponding to the area between the second contact portion  702   a  and the fourth contact portion  704   a.    
     The horizontal distance between the first contact portion  701   a  and the fourth contact portion  704   a  is set smaller than the thickness of the second main body terminal  670 . 
     Alternatively, the first contact portion  701   a  and the second contact portion  702   a  may be spaced from each other in a third direction (the direction of an arrow B) that is the arrangement direction of the first clip terminal and the second clip terminal. Further, the third contact portion  703   a  and the fourth contact portion  704   a  may be spaced from each other in the third direction. The third direction crosses the first direction and the second direction. 
     According to the arrangement of the contact portions, the deformation amount of the second contact portion  702   a  and the third contact portion  703   a  is large in the early stage of use after the cleaner is purchased. Further, even if the deformation amount of the second contact portion  702   a  and the third contact portion  703   a  is large and the restoring force is reduced, the first contact portion  701   a  and the fourth contact portion  704   a  can be stably brought in contact with the second main body terminal. 
       FIG. 26  is a view showing a battery according to another embodiment of the present invention inserted in a battery housing and  FIG. 27  is a view when the battery is separated from the battery housing in the state shown in  FIG. 26 . 
     This embodiment is the same as the previous embodiment except the structure and method for mounting and separating the battery. Accordingly, only characteristic parts of this embodiment are described hereafter. 
     Referring to  FIG. 26 , the battery  40  may further have a plurality of coupling portions  470   a  and  474 . The coupling portions  470   a  and  474  may include a first coupling portion  470   a  disposed on a first side of the frame  410  and a second coupling portion  474  disposed on a second side of the frame  410 . The first coupling portion  470   a  and the second coupling portion  474 , for example, may be positioned opposite to each other. 
     The second coupling portion  474  of this embodiment is the same as that of the first embodiment, so it is not described in detail. 
     The first coupling portion  470   a , unlike the first coupling portion  470  of the first embodiment, is not movably disposed on the frame  410  of the battery  40 , but may be fixed to the frame  410 . Alternatively, the first coupling portion  470   a  may be formed integrally with the frame  410 . The first coupling portion  470   a  may have a first hook  472   a.    
     Unlike the previous embodiments, when the battery  40  is inserted into the battery housing  600  without operating the first coupling portion  470   a , the first hook  472   a  of the first coupling portion  470   a  may be locked to the locking rib  640 . 
     Further, when the battery  40  is separated from the battery housing  600  without operating the first coupling portion  470   a , the first hook  472   a  and the locking rib  640  may be unlocked from each other. 
     With the battery  40  in the battery housing  600 , it is possible to separate the battery  40  from the battery housing  600  by pivoting (or tilting) the battery  40 . 
     For example, when a user pulls out the second hook  476  from the coupling slot  614  by operating the second coupling portion  474 , it is possible to pull down and pivot (tilt) the battery in the direction of an arrow C. 
     Accordingly, the first hook  472   a  is unlocked from the locking rib  640 , so the battery  40  can be separated from the battery housing  600 . 
     In order that the battery  40  is separated from the battery housing  600 , the battery terminals  490  should be separated from the second main body terminal  670 . 
     In order that the battery  40  is separated from the battery housing  600  by pivoting, one or more of the battery terminals  490  and the second main body terminal  670  should be elastically deformed. 
     In the present invention, the battery terminals  490  each have a plurality of clip terminals, as described above with reference to the first embodiment, in order to easily elastically deform the battery terminals  490 . 
     The second main body terminals  670  vertically extend and the clip terminals are horizontally arranged. 
     The second main body terminals  670  each have a plurality of terminal pins  671  and  672 . 
     The terminal pins  671  and  672  are horizontally spaced from each other. The terminal pins  671  and  672  have a width larger than the thickness. The terminal pins  671  and  672  respectively have contact surfaces  671   a ,  671   b ,  672   a , and  672   b  that are in contact with the clip terminals, respectively. 
     A second contact surface  672   b  of the first terminal pin  671  and a first contact surface  672   a  of the second terminal pin  671  are arranged to face each other. According to this arrangement, when a force perpendicular to the contact surfaces  671   a ,  671   b ,  672   a , and  672   b  is applied to the terminal pins, the terminal pins can be elastically deformed. 
     Further, since the clip terminals are horizontally arranged, the clip terminals can be elastically deformed when the battery  40  is separated. 
     When the battery  40  is pulled down and pivoted in the direction of the arrow C while being separated, one or more of the battery terminals  490  and the second main body terminals  670  can be elastically deformed, and as a result, the second main body terminals  670  can be pulled out of a pair of clip terminals of each of the battery terminals  490 . Deformation of the clip terminals is exemplified in  FIG. 27 . 
     On the other hand, the method of coupling the battery  40  to the battery housing  600  is the opposite to the method of separating the battery  40  from the battery housing  600 , so it is not described in detail. 
     According to the proposed embodiment, since it is possible to separate the battery from the battery housing, it is possible to independently charge only the battery on a cradle. 
     Further, since the first contact portions and the second contact portions of the battery terminals that are in contact with the main body terminals are spaced from each other in the direction parallel with the coupling direction of the battery terminals and the main body terminals, reliability in contact with the battery terminals can be improved. 
     Further, when the battery terminals are disposed on the circuit board of the battery management unit, the circuit board comes in contact with the anti-deformation ribs when the battery is mounted and separated, so deformation of the circuit board can be prevented.