Abstract:
An electrical apparatus for attaching a battery to a printed circuit board which includes a battery body containing terminals, a portion of each of said terminals defining a fixing portion, a circuit board containing conductive portions and at least one through hole formed therein, wherein the fixing portion of each of the terminals contains at least one engaging portion which lockingly engages the through holes formed in the circuit board or in the vicinity of the through holes and contains a contacting portion which contacts the conductive portion of the circuit board for electrically connecting the battery body to said conductive portion of the circuit board.

Description:
[0001]     This application is a Continuation of co-pending application Ser. No. 10/606,293, filed on Jun. 26, 2003 for which priority is claimed under 35 U.S.C. § 120, and which claims priority under 35 U.S.C. § 119(a) on Patent Application Nos. 2002-188544 and 2003-051763 filed in Japan on Jun. 27, 2002, and Feb. 27, 2003, the entire contents of each hereby incorporated by reference. 
     
    
     BACKGROUND OF THE INVENTION  
       [0002]     1. Field of the Invention  
         [0003]     The present invention relates to a battery provided with terminals, and more particularly, to a battery provided with terminals, capable of being attached to a circuit board of an electronic apparatus without soldering.  
         [0004]     2. Description of the Related Art  
         [0005]     In a flat battery such as button-shaped and coin-shaped batteries, or square and cylindrical batteries, a primary battery and a secondary battery represented by an alkaline dry battery, a lithium battery, a lithium secondary battery, and an alkaline storage battery are widely used as main power sources, or backup power supplies for memories of various electronic apparatuses.  
         [0006]     When mounting the battery on a circuit board of an electronic apparatus, it is suggested that terminals for soldering a battery to the circuit board, should be attached to the battery and that the battery is soldered to the circuit board together with other electronic parts by means of a reflow soldering furnace, in order to improve the efficiency of a manufacturing process.  
         [0007]     However, since the battery may be subjected to a high temperature, for example, over 150.degree. C. when the battery is passed through the reflow soldering furnace and heated, even for a short time, a physical change or chemical change occurs in the structure members of the battery, resulting in deterioration of the sealing characteristic, the discharge characteristic, and the cycle characteristic of the battery, which causes a short circuit in the battery. On the other hand, manual soldering application to the batteries, excluding other electronic parts in order to protect the battery, causes significant deterioration of work efficiency. Thus, there is required a high heat resistant battery, whose characteristics are not affected even though the battery passes through the reflow furnace. In particular, a dire need exists to develop a technology for making a high heat resistant lithium battery in which metal lithium with a low melting point is used for a negative electrode and an organic solvent with high volatility is used as an electrolyte solvent.  
         [0008]     In order to complete such a need, batteries which use a high heat resistant packing or an additive for improving a storage characteristic at a high temperature, are proposed (Japanese Unexamined Patent Application Publication Tokkai Nos. 8-153500 and 2000-323171). It is possible to improve the heat resistance of a battery by employing the above structure of the battery. Thus, it is possible to obtain a battery capable of passing through the reflow furnace without being damaged.  
         [0009]     In addition to, there is proposed a mounting structure for a battery in which the battery is fixed to a circuit board by interposing the circuit board between a battery body and terminals mounted on the battery body in stead of methods for fixing the battery to the circuit board by soldering, which enables the battery to be easily exchanged and repaired (Japanese Unexamined Patent Application Publication No. 10-64490). In accordance with the above method, it is possible to mount the battery on the circuit board without soldering.  
         [0010]     However, it has been proven that to make the battery heat resistant causes the following problems. That is, in the former two cases where the packing of the battery is made of a heat resistant material in order to prevent the battery from being damaged when passing through the reflow furnace, the cost of the material significantly increases compared to a material, such as polyolefin, commonly used in a conventional technology. In a case where an additive is included in an electrolyte, since the discharge characteristic of a battery deteriorates more or less, usable electronic apparatuses are restricted. Furthermore, since other structure members should be made of a high heat resistant material even though the additive is added, the cost of the material significantly increases. Since it is required to reduce the amount of the solder used in order to protect the environments due to influences of lead included in solder on environments, it is not preferable to use soldering to conductively connect a battery to a circuit board.  
         [0011]     Furthermore, when using the mounting structure in which the circuit board is interposed between the battery body and the terminal mounted on the battery body, since the outer body of the battery directly contacts the conductive portion of the circuit board, the arrangement of the battery is significantly restricted during the mounting of the battery. Thus, it is difficult to compose thin electronic apparatuses and to save the space of the circuit, and it is easy to generate poor connections caused by vibration. Therefore, reliability deteriorates.  
       SUMMARY OF THE INVENTION  
       [0012]     It is a first object of the present invention to provide a battery provided with terminals, which is capable of solving the problems that occur when the battery is mounted on a circuit board of an electronic apparatus and of being mounted on the circuit board without soldering.  
         [0013]     It is a second object of the present invention to provide a battery provided with terminals for fixing a battery body in a state of being electrically connected to the conductive portions of the circuit board without soldering.  
         [0014]     According to a first aspect of this invention, as shown in  FIGS. 1 and 2 , a battery includes a battery body  2 , and terminals  7  for electrically connecting the battery body  2  to conductive portions  6  provided in a circuit board  5 . A portion of each of the terminals  7  is fixing portion  9  for fixing the battery body  2  to the circuit board  5 .  
         [0015]     Furthermore, engaging portions  12  for engaging a through hole  13  formed in the circuit board  5  and contacting portions  11  contacting the conductive portion  6  to electrically connect the conductive portion  6  to the battery body  2  are provided in the fixing portion  9  of the terminal  7 , so that the battery body  2  is electrically connected to the conductive portion  6  in the circuit board  5 .  
         [0016]     Therefore, according to the invention, when mounting the battery on the circuit board of an electronic apparatus, it is possible to mount the battery body on the circuit board without soldering, by using the battery provided with terminals according to the present invention. Thus, it is possible to reduce the amount of solder used. Since it is not necessary to perform soldering operation, it is possible to mount the battery body on the circuit board with ease and convenience. Furthermore, since it is unnecessary to consider the heat resistance of the battery, it is possible to mount the battery body having an excellent discharge characteristic, which has the same structure as a conventional structure, on the circuit board. Thus, it is possible to improve the operation characteristic of an electronic apparatus.  
         [0017]     In a first preferred embodiment according to the invention, the contacting portion  11  and/or the engaging portions  12  have resilient function or spring characteristic, and the contacting portion  11  and/or the engaging portions  12  press the circuit board  5  to fix the battery body  2  on the circuit board.  
         [0018]     Further, the engaging portions  12  have locking portions  22  for preventing the battery body  2  from separating from the circuit board  5  by engaging in the through hole  13  of the circuit board  5  or in the vicinity of the through hole  13 . The conductive portions  6  may be provided in the through holes  13  formed in the circuit board  5  or around the through hole  13 .  
         [0019]     According to a second aspect of the present invention, as shown in  FIGS. 3 and 4 , a battery provided with terminals includes the battery body  2 , and terminals  7   a  and  7   b  for electrically connecting the battery body  2  to conductive portions  6   a  and  6   b  provided in the circuit board  5 . A portion of the  20  terminal  7   b  is fixing portion  9  for fixing the battery body  2  to the circuit board  5 . Furthermore, the fixing portion of the terminal  7   b  comprises clamping or sandwiching portions  34  and  35  for clamping the circuit board  5  in between surfaces of both sides so that a portion of each of the terminals  7   a  and  7   b  can fix the battery body  2  to the circuit board  5  sandwiched therebetween. The clamping portions  34  comprise contacting portions, which contact the conductive portions  6   b  of the circuit board  5  and electrically connect the conductive portions  6   b  to the battery body  2 . The clamping portions  35  may be provided with engaging portions  37 , which engage the portions where the conductive portions  6   a  and  6   b  of the circuit board  5  are provided, or the portion in the vicinity of the conductive portions when the battery body  2  is mounted on the circuit board  5 , thereby preventing the battery body  2  from deviating from the circuit board  5  or from coming out from the circuit board  5 .  
         [0020]     According to a third aspect of the invention, as shown in  FIGS. 5 and 6 , a battery provided with terminals includes the battery body  2 , and the terminals  7   a  and  7   b  for electrically connecting the battery body  2  to the conductive portions  6   a  and  6   b  provided in the circuit board  5 . The terminals  7   a  and  7   b  include contacting portions  42  and  44 , which contact the conductive portions  6   a  and  6   b  to thus be conductively connected to the conductive portions  6   a  and  6   b,  respectively. The through holes  43  and  45  or notches are provided in the contacting portions  42  and  44 . The terminals  7   a  and  7   b  are fixed to the circuit board  5  by rivets  40  inserted into the through holes  43  and  45 , or the notches.  
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0021]     The above and other objectives and features of the present invention will become more apparent from the following description of a preferred embodiment thereof with reference to the accompanying drawings, throughout which like parts are designated by like reference numerals, and wherein:  
         [0022]      FIG. 1  illustrates an example of a battery provided with terminals according to a first aspect of the present invention.  FIG. 1A  is a side view of a battery provided with terminals.  FIG. 1B  is a front view of a terminal in a negative electrode, which is taken along the line A-A in  FIG. 1A ;  
         [0023]      FIG. 2  is a sectional view, which is taken along the line B-B of  FIG. 1B ;  
         [0024]      FIG. 3A  is a side view of a battery provided with terminals according to a second embodiment of the present invention.  FIG. 3B  is a top view of a circuit board seen from above;  
         [0025]      FIG. 4  is an exploded perspective view of the battery provided with terminals according to the second embodiment of the present invention;  
         [0026]      FIG. 5  is a side view of a battery provided with terminals according to a third embodiment of the present invention;  
         [0027]      FIG. 6  is an exploded perspective view of the battery provided with terminals according to the third embodiment of the present invention;  
         [0028]      FIG. 7  is a side view of a battery provided with terminals according to a fourth embodiment of the present invention, wherein an A-A line sectional part of the connecting portion is enlarged; and  
         [0029]      FIG. 8  is a front view of a terminal in the negative electrode, which is taken along the line B-B in  FIG. 7 . 
     
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0030]     Preferred embodiments of the present invention will now be described in detail.  
       First Embodiment  
       [0031]     A battery provided with terminals according to the present invention will be described with a coin-shaped lithium battery taken as an example.  FIG. 1A  is a side view of a coin-shaped lithium battery  1 .  FIG. 1B  is a front view of a terminal  7  in a negative electrode, which is taken along the line A-A in  FIG. 1A .  FIG. 2  is a sectional view, which is taken along the line B-B of  FIG. 1B . The coin-shaped lithium battery  1  includes a battery body  2  and terminals  7  welded and fixed to the positive electrode and the negative electrode of the battery body  2 . The battery body  2  includes a bottomed cylindrical battery case  3 , which has an opening on an upper surface, and a cover  4  for sealing up the opening. The battery case  3  is the positive electrode, and the cover  4  is the negative electrode.  
         [0032]     The terminals  7 , 7  electrically connect the conductive portions  6  provided in the circuit board  5  to the positive electrode and the negative electrode of the battery body  2 , respectively, and fix the battery body  2  to the circuit board  5  so that the battery body  2  does not move. Each terminal  7  is a substantially L shaped press metal fitting, in which horizontal arms  8 , welded and fixed to the upper and lower surfaces of the battery body  2  and extended back and forth in a horizontal direction, are integrated with fixing portions  9 , bent and curved downward from the free ends of the horizontal arms  8 .  
         [0033]     As shown in  FIGS. 1 and 2 , each fixing portion  9  includes a central main resilient arm (a contacting portion)  11 , which is extended downward in an overhung style from the bent portion of the horizontal arm  8 , and a pair of auxiliary resilient arms (engaging portions)  12 , which are extended downward in the overhung style so as to sandwich the main resilient arm and are capable of being elastic-deformed from side to side. The main resilient arm  11  and the auxiliary resilient arms  12  are inserted into the through holes  13  provided in the circuit board  5 . Thus, the fixing portions  9  contact the conductive portions  6  formed on the internal walls of the through holes  13  to thus electrically connect the conductive portions  6  to the positive electrode and the negative electrode of the battery body  2 . Furthermore, the fixing portions  9  protrude from the circuit board  5  to thus fix the battery body  2 , so that the battery body  2  does not move.  
         [0034]     As shown in  FIG. 2 , the through holes  13  are a rectangle that is long in the right and left directions and short in the forth and rear directions, as seen in a plane. All over the inner circumferential surface of the through holes  13  is straight such that the sizes of upper and lower paths are equal to each other. The conductive portion  6  is formed all over the internal circumferential surface of the through hole  13 .  
         [0035]     As shown in  FIGS. 1 and 2 , the main resilient arm  11  includes a resilient metal plate  15  formed to be swollen toward the side of the battery body  2 , that is, backward and capable of being elastic-deformed back and forth, and resilient metal plates  16  formed to be swollen forward and capable of being elastic-deformed back and forth. The resilient metal plates  15  and  16  are supported between an upper extended base end  17  and a lower extended base end  18  in a center impeller. The distance between the resilient metal plates  15  and  16  in the front and rear directions, in which the resilient metal plate  15  faces the resilient metal plates  16 , is set to be slightly larger than the length of the path of the through hole  13  in the front and rear directions. Therefore, when the resilient metal plates  15  and  16  are inserted into the through hole  13 , the resilient metal plates  15  and  16  pressingly contact the front and rear walls of the through hole  13 .  
         [0036]     The auxiliary resilient arms  12  include a base ends  20  extended downward from an upper end, a thin portion  21  formed by thinning the right and left external wall surfaces of the base ends  20 , and a locking portions  22  integrated with the extended end of the thin portions  21  and protruding outward in the right and left directions. The right and left external wall surfaces of the locking portions  22  are taper-shaped guide surfaces  23  of which an upper portion is wider. The auxiliary resilient arms  12  are extended from right and left external positions of the extended base end  17  of the main resilient arm  11 . Furthermore, a deformation gap G is secured between the right and left internal surfaces of the auxiliary arms  12  and the external surfaces of the main resilient arm  11  which face the internal surfaces, so that the auxiliary resilient arms  12  are elastic-deformed in right and left inward directions (in the direction of the main resilient arm  11 ). That is, the auxiliary resilient arms  12  closely face the main resilient arm  11  through a little gap. Thus, the auxiliary resilient arms  12  can be elastically deformed from side to side and be independent from the main resilient arm  11 .  
         [0037]     As shown in  FIG. 1B , the distance between the right and left external wall surfaces of the thin portion  21  is set to be substantially equal to the distance between the right and left internal wall surfaces of the through hole  13 , wherein the right and left internal wall surfaces face each other. Therefore, the locking portions  22  protrude outward from side to side compared to the internal wall surface of the through hole  13  by as much a thickness difference between the locking portion  22  and the thin portion  21  in the right and left directions. The up and down distance between the base end  20  and the locking portion  22 , that is, the up and down distance of the thin portion  21  is set to be substantially equal to the thickness of the circuit board  5  at the peripheral edge of the through hole  13 .  
         [0038]     How to mount the battery provided with terminals  1  will now be described. When the auxiliary resilient arms  12  are concentrically inserted into the through hole  13  while contacting the guide surfaces  23  of the locking portions  22  to the upper ends of the right and left internal walls of the through hole  13 , the auxiliary resilient arms  12  are elastically deformed in the direction of the deformation gap G. In the state in  FIG. 1B  where the fixing portion  9  is completely inserted into the through hole  13 , the locking portions  22  protrude from side to side from the through hole  13  by the elastic resilience of the auxiliary resilient arm  12 . Thus, the locking portions  22  are engaged with the circuit board  5  related to the peripheral edge of the lower end of the through hole  13 . It is possible to prevent the terminal  7  from carelessly coming out from the through hole  13  by engaging the locking portions  22  with the circuit board  5  at the peripheral edge of the lower end of the through hole  13 . That is, it is possible to prevent the terminal  7  from coming out upward by the auxiliary resilient arms  12  being caught in the circuit board  5  related to the peripheral edge of the through hole  13 .  
         [0039]     Also, when the auxiliary resilient arms  12  are inserted into the through hole  13 , the up and down movement of the terminal  7  is restricted within the vertical length of the thin portion  21 . To be specific, the step parts between the thin portions  21  and the base ends  20  are caught in the circuit board  5  at the peripheral edge of the upper end of the through hole  13 . Thus, the terminal  7  can be firmly inserted into the through hole  13  without sinking downward. Furthermore, since the locking portions  22  are engaged with the circuit board  5  at the peripheral edge of the lower end of the through hole  13 , it is possible to prevent the terminal  7  from coming out upward. As a result, it is possible to prevent the terminal  7  from carelessly coming out from the through hole  13  or from deviating from the through hole  13  due to an external shock inflicted on the terminal  7 . Moreover, since the right and left external surfaces of the thin portions  21  contact the right and left internal wall surfaces of the through hole  13 , the terminal  7  does not deviate from side to side.  
         [0040]     In addition, since the auxiliary resilient arms  12  can be elastically deformed, after the locking portions  22  are inserted into the through hole  13 , the locking portions  22  can be penetrated and engaged with the through hole  13  while sliding along the right and left side surfaces of the through hole  13  by pushing the terminal  7  into the through hole  13 . Thus, it is possible to easily insert the battery provided with terminals  1  into the through hole  13 . If necessary, the battery provided with terminals  1  can be easily detached from the through hole  13  in the reverse order. That is, when the battery provided with terminals  1  is detached from the circuit board  5 , the locking portions  22  of the auxiliary resilient arms  12  are caught by the ends of fingers and are bent toward the main resilient arm  11  to thus release the engagement of the locking portion  22  with the circuit board  5 . Then, the terminal  7  is lifted upward.  
         [0041]     When the terminal  7  is concentrically inserted into the through hole  13 , the resilient metal plates  15  and  16 , which form the main resilient arm  11 , are elastically deformed so that the distance in the front and rear directions between the resilient metal plates  15  and  16 , in which the resilient metal plate  15  faces the resilient metal plates  16 , is reduced. In reference to the state in  FIGS. 1A and 2 , at the location where the fixing portion  9  is completely concentrically inserted into the through hole  13 , the main resilient arm  11  is pressed to and engaged with the internal wall surface in the front and rear directions of the through hole  13  by the elastic resilience of the resilient metal plates  15  and  16 . Electrical conduction between the terminal  7  and the conductive portion  6  is secured and it is possible to prevent the terminal  7  from deviating in the front and rear directions due to the pressing engagement between the resilient metal plates  15  and  16  and the internal wall surface of the through hole  13 .  
       Second Embodiment  
       [0042]     A second embodiment of the battery provided with terminals, according to the present invention, is shown in  FIGS. 3 and 4 . In this case, the battery provided with terminals  1  includes the battery body  2 , a negative electrode terminal  7   a,  that is welded and fixed to the upper surface of the battery body  2 , and an positive electrode terminal  7   b,  that is welded and fixed to the lower surface of the battery body  2 . The battery provided with terminals  1  is mounted in and fixed to the peripheral edge of the circuit board  5 .  
         [0043]     The negative electrode terminal  7   a  is a press metal fitting in which a horizontal arm  30 , extending backward, is integrated with a contacting portion  31 , which is formed by bending it in a V-shape in the free end of the horizontal arm  30 , to contact the conductive portion  6   a  of the circuit board  5 . The base end of the horizontal arm  30  is welded and fixed to the upper surface of the battery body  2 . The contacting portion  31  with the conductive portion  6   a  is flat.  
         [0044]     In  FIG. 4 , the positive electrode terminal  7   b  is a press metal fitting in which a base wall  32  supporting the lower surface of the battery body  2 , a pair of right and left supporting arms  33 , that is turned upward from the right and left sides of the rear end of the base wall  32 , an upper engaging arm  34 , that is extended from the upper end of the supporting arm  33  and bent downward on the tilt, a lower engaging arm  35 , that is extended backward from the center of the rear end of the base wall  32 , and a releasing piece  36 , that is bent downward on the tilt from the free end of the lower engaging arm  35 , are integrated with each other. The battery body  2  is welded and fixed to the upper surface of the base wall  32 . A fixing protrusion (an engaging portion)  37  is cut and raised on the upper surface of the lower engaging arm  35 . The distance between the supporting arms  33 , in which the right and left supporting arms  33  face each other, is set to be larger than the right and left widths of the negative electrode terminal  7   a.  The distance between the upper engaging arm  34  and the lower engaging arm  35 , in which the upper engaging arm  34  faces the lower engaging arm  35 , is set to be a little smaller than the thickness of the circuit board  5 . The upper and lower engaging arms  34  and  35  can be elastically deformed up and down a little. The fixing portions and the clamping portions according to the present invention are composed of the engaging arms  34  and  35 .  
         [0045]     In  FIGS. 3A and 3B , a reference numeral  13  denotes a substantially rectangular through hole, which is provided around the peripheral edge of the circuit board  5 . The negative electrode conductive portion  6   a  is provided on the upper surface of the circuit board  5  between the through hole  13  and the peripheral edge of the circuit board  5 . The positive electrode conductive portions  6   b  are provided on the right and left sides of the negative electrode conductive portion  6   a.  That is, the positive and negative electrode conductive portions  6   a  and  6   b  are provided on the upper surface of the circuit board  5  to be parallel to each other from side to side. The distance between the right side and left side of the through hole  13  is set to be slightly larger than the length of the protrusion  37 .  
         [0046]     In the battery provided with terminals  1  having the above structure, the battery  1  is mounted on the circuit board  5  by interposing the circuit board  5  between the upper engaging arms  34  and the lower engaging arm  35  of the positive electrode terminal  7   b.  That is, the battery  1  is mounted on the circuit board  5  by clamping the circuit board  5  between the upper and lower engaging arms  34  and  35  in the up and down directions in a clip state. At this time, the battery  1  is fixed to the circuit board by resilient force of the engaging arms  34  and  35 , and the upper engaging arms  34  contacts the conductive portions  6   b.  Thereby, the positive electrode of the battery body  2  is conductively connected to the circuit board  5 . At the same time, the fixing protrusion  37  provided on the lower engaging arm  35  is inserted into the through hole  13 , which is provided in the circuit board  5 . Thus, the battery  1  is engaged to the circuit board  5 , thereby preventing the battery  1  from coming out from the circuit board  5 . Meanwhile, the contacting portion  31  of the negative electrode terminal  7   a  contacts the conductive portion  6   a  so that the negative electrode of the battery body  2  is conductively connected to the circuit board  5 .  
         [0047]     When the battery provided with terminals  1  is detached from the circuit board  5 , the releasing piece  36  of the lower engaging arm  35  is caught by the ends of fingers to bend the lower engaging arm  35  downward. Next, the engagement of the protrusion  37  to the through hole  13  is released. Then, the battery  1  is taken out in a forward direction.  
       Third Embodiment  
       [0048]     A third embodiment of the battery provided with terminals according to the present invention is shown in  FIGS. 5 and 6 . The battery provided with terminals  1  includes the battery body  2 , a negative electrode terminal  7   a  which is welded and fixed to the upper surface of the battery body  2 , and a positive electrode terminal  7   b  which is welded and fixed to the lower surface of the battery body  2 . The battery  1  is fixed to and mounted on the circuit board  5  using rivets  40 .  
         [0049]     The negative electrode terminal  7   a  is a press formed product obtained by bending a horizontal portion  41  which is extended outward from the battery body  2 , and a backing plate (a contacting portion)  42 , which is fixed to the circuit board  5  by rivet in the shape of steps. A through hole  43  for the rivet  40  is formed in the center of the backing plate  42 . The positive electrode terminal  7   b  is a long flat metal plate, and a through hole  45  for the rivet  40  is provided in the center of a free end (a contacting portion)  44 .  
         [0050]     A battery chamber  46  for holding the battery body  2  is disposed to penetrate the circuit board  5 . The conductive portions  6   a  and  6   b  are buried on the surfaces of the circuit board  5  related to the peripheral edge of the battery chamber  46  facing the positive electrode and negative electrode terminals  7   a  and  7   b.  The through holes  47  for the rivets  40  are formed in the conductive portions  6   a  and  6   b  and the circuit board  5  corresponding thereto.  
         [0051]     When mounting and fixing the battery provided with terminals  1  onto the circuit board, firstly, the positive electrode terminal  7   b  is inserted into the battery chamber  46  and the battery  1  is temporarily assembled on the circuit board  5 . Then, the through holes  43 ,  45  and  47  of the terminals  7   a  and  7   b  and the conductive portions  6   a  and  6   b  are arranged, and then the rivets  40  are inserted into the through holes  43 ,  45  and  47 . Next, the sharp ends of the rivets  40 , which protrude from the through holes  43  and  44 , are made flat. As a result, the terminal  7   a  and  7   b  are fixed to the circuit board  5  with caulking. At this time, the conductive portions  6   a  and  6   b  provided on the circuit board  5  contact the backing plate  42  and the free end  44  of the terminals  7   a  and  7   b,  respectively. Therefore, the battery body  2  is conductively connected to the circuit board  5 .  
       Fourth Embodiment  
       [0052]     A fourth embodiment of the battery provided with terminals according to the present invention is shown in  FIGS. 7 and 8 . In this embodiment, the fixing portion  9  of terminals  7 ,  7  is designed to have an engaging portion  12  including a contacting portion  11 . In detail, the contacting portion  11  is designed to include a pair of resilient plates  15  and  15 , between which an auxiliary resilient arm is positioned and designed to work as a locking portion  22 . The same numbers indicate the same function portions as in the first embodiment, so that the detailed explanation is omitted and the first embodiment should be made reference.  
         [0053]     According to the present embodiments, the positive electrode terminal and the negative electrode terminal both have the terminal structure of to the present invention. However, either the positive electrode terminal or the negative electrode terminal may have the above structure. Also, the arrangement of the battery is not restricted to that mentioned above.  
         [0054]     According to the present invention, the material of the terminal is not restricted, but may be metal such as steel, copper, nickel, aluminum and titan, or an alloy thereof (stainless steel and brass), or a compound of a plurality of materials such as a clad plate of the above member. Furthermore, the surface of the terminal may be plated with tin, solder, copper, gold and the like. When mounting the terminal on the external can of the battery by welding, it is preferable to select the material of the terminal in consideration of the characteristic of welding against the external can. When the external can is stainless steel, it is preferable that the material of terminal be stainless steel or nickel. When the external can is aluminum or an aluminum alloy, it is preferable that the material of terminal be aluminum or an aluminum alloy.