Patent Publication Number: US-2021194067-A1

Title: Storage battery device for a battery pack of a handheld power tool

Description:
CROSS REFERENCE 
     The present application claims the benefit under 35 U.S.C. § 119 of German Patent Application No. DE 102019220202.0 filed on Dec. 19, 2019, which is expressly incorporated herein by reference in its entirety. 
     BACKGROUND INFORMATION 
     A convention storage battery device for a battery pack of a handheld power tool includes at least one electronics unit that has at least one circuit board. 
     SUMMARY 
     The present invention relates to a storage battery device for a battery pack of a handheld power tool, including at least one electronics unit, which has at least one circuit board. 
     In accordance with an example embodiment of the present invention, the electronics unit includes at least one electrically conductive plastic element, in particular, an electrically conductive elastomer, which is connected electrically to at least the circuit board. This advantageously allows a high degree of protection of a storage battery device to be achieved. A high degree of functionality of an electronics unit may be provided in an advantageous manner. A simple type of construction of a storage battery device may be implemented in an advantageous manner. Particularly simple electrical contacting of a circuit board may advantageously be produced. A high degree of reliability of the electrical contacting of an electronics unit may be ensured in an advantageous manner. 
     In particular, the electrically conductive plastic element is made completely of a conductive plastic. The electrically conductive plastic element is preferably made of an electrically conductive polymer, such as a polypropylene (PP), a polyethylene (PE), a polyester, a polymer mixture (mixture of a homopolymer and a copolymer), or another polymer appearing useful to one skilled in the art. In particular, the electrically conductive plastic element takes the form of an electrically conductive elastomer. In particular, it is possible for the electrically conductive plastic element to be doped. It is also possible for the electrically conductive plastic element to be made of an extrinsically conductive polymer, which is preferably conductive due to electrically conductive fillers, such as aluminum flakes, carbon or the like. In particular, it is possible for the electronics unit to include a plurality of electrically conductive plastic elements. In particular, the electrically conductive plastic element is at least partially, preferably completely, wire-shaped. However, it is also possible for the electrically conductive plastic element to be at least partially planar. It is also possible for the electrically conductive plastic element to be completely planar. 
     The electrically conductive plastic element is preferably designed to electrically connect at least the circuit board to at least a further unit and/or a further element of the storage battery device. In particular, the electrically conductive plastic element is configured to electrically connect at least the circuit board to a battery cell unit of the storage battery device. The battery cell unit preferably includes at least one cell holder unit. In particular, the cell holder unit has at least one battery cell, in particular, a plurality of battery cells; the cell holder unit being designed at least to hold the battery cells. The battery cells of the cell holder unit are preferably interconnected electrically by at least one cell connector and/or a further cell connector. The cell connector is preferably positioned at negative poles of the battery cells, in particular, connected to the negative poles of the battery cells electrically. The further cell connector is preferably positioned at positive poles of the battery cells, in particular, connected to the positive poles of the battery cells electrically. In particular, the at least one battery cell takes the form of a lithium ion cell. It is also possible for the battery cell to take the form of a different conventional battery cell, such as a Pb battery cell, a NiCd battery cell, a NiFe battery cell, or the like. The electrically conductive plastic element is preferably connected to the negative poles of the battery cells electrically, in particular, via the cell connector. It is also possible for the electrically conductive plastic element to be connected electrically to the positive poles of the battery cells, in particular, via the further cell connector. 
     In particular, metallic, electrical contact elements of the battery device, such as ones containing copper or made out of copper, which are intended for electrical contacting, and/or contacting enabling data exchange, of the battery device, with mating contact elements of the handheld power tool and/or with mating contact elements of a battery charger, are preferably provided on the circuit board. In particular, the circuit board is situated on, in particular, for the most part, in, a housing unit of the battery device and/or on the battery cell unit. 
     Using at least one spacing element, preferably, a plurality of spacing elements, the circuit board is preferably positioned on the battery cell unit so as to be set apart from it. It is also possible for the circuit board to be positioned directly on the battery cell unit. In particular, at least the electrical contact element is situated on a side of the circuit board, which is opposite to a further side, on which at least the spacing element is situated. In particular, the battery cell unit is at least partially connected to the electrical contact elements of the circuit board electrically, via at least the electrically conductive plastic element. In particular, the circuit board includes at least one electrical contact surface, on which the electrically conductive plastic element is situated. In particular, the contact surface is positioned so as to be set apart from the electrical contact elements. In particular, the electrically conductive plastic element is pressed against the contact surface. It is also possible for the electrically conductive plastic element to be glued, bolted, clamped, or the like, to the contact surface. 
     In particular, the electronics unit includes at least one further electrically conductive plastic element, preferably, a plurality of further electrically conductive plastic elements. In particular, the further electrically conductive plastic element is formed identically to the electrically conductive plastic element. It is also possible for the further electrically conductive plastic element to be formed differently from the electrically conductive plastic element. In particular, the further electrically conductive plastic element is connected electrically to the positive poles of the battery cells, in particular, via the further cell connector. It is also possible for the further electrically conductive plastic element to be connected to the negative poles of the battery cells electrically, in particular, via the cell connector. In particular, the further electrically conductive plastic element is situated on a further electrical contact surface of the circuit board. In particular, the further electrical contact surface is positioned so as to be set apart from the electrical contact elements. In particular, the further electrical contact surface is positioned oppositely to the electrical contact surface. In particular, the further electrically conductive plastic element is pressed against the further electrical contact surface. It is also possible for the further electrically conductive plastic element to be glued, bolted, clamped, or the like, to the further contact surface. 
     In particular, it is possible for the battery cell unit to include a further cell holder unit. In particular, the further cell holder unit is formed identically to the cell holder unit. It is also possible for the further cell holder unit to be formed differently from the cell holder unit. It is possible for the further cell holder unit to have a number of battery cells different from that of the cell holder unit. It is also possible for the further cell holder unit to include battery cells, which are formed differently from the battery cells of the cell holder unit. In particular, the electronics unit includes at least one additional electrically conductive plastic element, preferably, a plurality of additional electrically conductive plastic elements, and at least another additional electrically conductive plastic element, preferably, a plurality of other additional electrically conductive plastic elements. In particular, at least the additional electrically conductive plastic element is formed at least identically to the electrically conductive plastic element. It is also possible for at least the additional electrically conductive plastic element and/or at least the other additional electrically conductive plastic element to be formed differently from the electrically conductive plastic element. Preferably, all of the electrically conductive plastic elements are formed identically, in particular, with regard to their electrical characteristics. In particular, the further cell holder unit is connected to the circuit board via the additional electrically conductive plastic element and/or the other additional electrically conductive plastic element. In particular, the further cell holder unit is positioned so as to be set apart from the cell holder unit. In particular, at least the electrically conductive plastic element and the further electrically conductive plastic element are positioned so as to be set apart from the additional electrically conductive plastic element and the other additional electrically conductive plastic element. 
     In particular, it is possible for the electronics unit to include at least one further circuit board. In particular, the further circuit board is formed at least substantially identically to the circuit board. “At least substantially identical” is to be understood as, in particular, identical right down to a reflection, preferably, a point reflection, particularly preferably, right down to an axial reflection. However, it is also possible for the further circuit board to be formed differently from the circuit board. In particular, the further circuit board is intended for a function different from the function of the circuit board, such as, in particular, indicating a state of charge. In particular, at least the electrically conductive plastic element is designed to electrically connect at least the circuit board to the further circuit board. It is also possible for the further circuit board to be connected electrically, in particular, electrically in a direct manner, to the battery cell unit, preferably, at least via the electrically conductive plastic element. In particular, the further circuit board is positioned so as to be set apart from the circuit board. In particular, the further circuit board is situated on the battery cell unit. In particular, the further circuit board is situated on the battery cell unit so as to be set apart from it by spacing elements. It is also possible for the further circuit board to be positioned directly on the battery cell unit. 
     In addition, in accordance with an example embodiment of the present invention, it is provided that the electrically conductive plastic element have at least an electrical conductivity in a range of 10 −10  S cm −1  to 10 3  S cm −1 . A low volume resistivity of an electrically conductive plastic element may be produced in an advantageous manner. In particular, at least the electrically conductive plastic element is configured to transmit electrical power. At least the electrically conductive plastic element is preferably configured to transmit an electrical signal. It is possible for at least the electrically conductive plastic element to be at least configured to form at least part of an electrical heating unit. It is also possible for the electrically conductive plastic element to have an electrical conductivity, which lies in a range different from the range of 10 −10  S cm −1  to 10 3  S cm −1 , in particular, below the range of 10 −10  S cm −1  to 10 3  S cm −1 , or, advantageously, above the range of 10 −10  S cm −1  to 10 3  S cm −1 . In particular, the further electrically conductive plastic element, the additional electrically conductive plastic element, and/or the other additional electrically conductive plastic element has an electrical conductivity identical to the electrical conductivity of the electrically conductive plastic element. It is also possible for the further electrically conductive plastic element, the additional electrically conductive plastic element, and/or the other additional electrically conductive plastic element to have an electrical conductivity different from, in particular, less than or greater than, the electrical conductivity of the electrically conductive plastic element. The electrically conductive plastic element preferably has a maximum electrical volume resistance, which is, in particular, less than 10 9  Ohm, preferably, less than 10 7  Ohm, and, particularly preferably, less than 10 5  Ohm. 
     It is further provided that the battery device include at least one housing unit, in particular, the one already mentioned above, and a battery cell unit, in particular, the one already mentioned above; the electrically conductive plastic element being situated on the battery cell unit and/or on the housing unit. A high level of protection of the battery cell unit is advantageously ensured. An electronics unit having a high level of functionality may be advantageously produced for the battery cell unit. In particular, the electrically conductive plastic element is positioned at least substantially completely, preferably completely, between the housing unit and the battery cell unit. “At least substantially completely” is to be understood as, in particular, at least 50%, preferably, at least 75%, and, particularly preferably, at least 90%, of a total volume and/or a total mass of an object, in particular, of the electrically conductive plastic element. In particular, the electrically conductive plastic element surrounds the battery cell unit at least partially. In particular, the housing unit includes at least one lateral cover. The lateral cover is situated on the battery cell unit, preferably, on the cell holder unit. In particular, the battery cell unit is surrounded at least partially by the lateral cover. In particular, the electrically conductive plastic element is situated between the lateral cover and the battery cell unit. Preferably, the electrically conductive plastic element is surrounded at least partially, in particular, at least substantially completely, and, particularly preferably, completely, by the lateral cover. The lateral cover preferably forms at least one shoulder, which faces the circuit board. In particular, the shoulder has a free end, which is opposite to the electrical contact surface of the circuit board. In particular, the free end of the shoulder of the lateral cover is positioned so as to be set apart from the electrical contact surface of the circuit board. The electrically conductive plastic element is preferably positioned at least partially between the lateral cover, in particular, the free end of the shoulder of the lateral cover, and the circuit board, preferably, the electrical contact surface of the circuit board. In particular, the electrically conductive plastic element may be forced against the circuit board by the lateral cover. It is also possible for contacting, in particular, electrical contacting, of at least the electrically conductive plastic element with the circuit board to be able to be produced with the aid of a spring unit. Preferably, the spring unit is formed in one piece with the electrically conductive plastic element, is attached to the circuit board, or is formed in one piece with the circuit board. In addition, it is possible for at least the electrically conductive plastic element to be pressed into the circuit board with the aid of a pressing technique. In particular, the electrically conductive plastic element may be forced by the lateral cover against the cell holder unit, preferably, against the cell connector of the battery cells. It is also possible for the electrically conductive plastic element to be able to be fastened to the cell connector by at least one fastening element, such as a screw, preferably, a retaining ring. In order to attach the electrically conductive plastic element, the cell connector preferably includes a recess, which has, in particular, toothing pointing inwards; the toothing being configured to secure the electrically conductive plastic element, which is insertable at least partially into the recess, to the cell connector, in particular, in the manner of a barb. In particular, the electrically conductive plastic element is guided at least partially through the lateral cover and/or the battery cell unit. 
     In particular, the further electrically conductive plastic element is positioned at least substantially completely, preferably completely, between the housing unit and the battery cell unit. In particular, the further electrically conductive plastic element surrounds the battery cell unit at least partially. In particular, the housing unit includes at least one further lateral cover. In particular, the further lateral cover is situated on the battery cell unit, preferably, on the cell holder unit. In particular, the battery cell unit is surrounded at least partially by the further lateral cover. In particular, the further electrically conductive plastic element is situated between the further lateral cover and the battery cell unit. In particular, the further electrically conductive plastic element is surrounded by the further lateral cover at least partially, preferably, at least substantially completely, and particularly preferably, completely. In particular, the further lateral cover is formed at least substantially identically to the lateral cover. It is also possible for the further lateral cover to be formed differently from the lateral cover. In particular, a free end of a shoulder of the further lateral cover faces the circuit board. The free end of the shoulder of the further lateral cover is preferably opposite to the further electrical contact surface of the circuit board; the free end of the shoulder of the further lateral cover being positioned, in particular, so as to be set apart from the further electrical contact surface. In particular, the further electrically conductive plastic element is positioned at least partially between the further lateral cover, in particular, the free end of the shoulder of the further lateral cover, and the circuit board, preferably, the further electrical contact surface of the circuit board. In particular, the further electrically conductive plastic element may be forced against the circuit board by the further lateral cover. In particular, the further electrically conductive plastic element may be forced by the further lateral cover against the cell holder unit, preferably, against the further cell connector. In particular, the further electrically conductive plastic element is guided at least partially through the further lateral cover and/or the battery cell unit. 
     It is further provided that the storage battery device include at least one housing unit, in particular, the one already mentioned above, and a battery cell unit, in particular, the one already mentioned above; the electrically conductive plastic element being molded into the battery cell unit and/or into the housing unit. A particularly simple type of construction of a storage battery device with regard to at least the manufacturing costs may be implemented in an advantageous manner. Particularly simple contacting of the circuit board with the battery cell unit may advantageously be produced. A particularly high degree of reliability of electrical contacting of the circuit board may be achieved in an advantageous manner. In particular, at least the electrically conductive plastic element is extruded onto the cell holder unit, onto the cell connector, and/or onto the lateral cover. In particular, it is possible for the electrically conductive plastic element to be formed in one piece with the lateral cover. “In one piece” is to be understood as, in particular, at least integrally joined, for example, by a welding method, an adhesive bonding method, an injection molding method, and/or another method appearing to be useful to one skilled in the art; and/or understood as formed advantageously in one piece, such as through production from casting and/or through production in a single-component or multicomponent injection molding method, and, advantageously, from a single blank. In particular, the circuit board includes an additional electrical contact surface. In particular, the additional electrical contact surface of the circuit board is positioned oppositely to the battery cell unit. In particular, the electrically conductive plastic element is situated on the additional electrical contact surface, preferably, connected to the additional electrical contact surface electrically. In particular, the further electrically conductive plastic element is extruded onto the cell holder unit, onto the further cell connector, and/or onto the further lateral cover. In particular, it is possible for the further electrically conductive plastic element to be formed in one piece with the further lateral cover. In particular, the further electrically conductive plastic element is situated on the additional electrical contact surface, preferably, connected to the additional electrical contact surface electrically. 
     It is further provided that the storage battery device include at least one battery cell unit, in particular, the one already mentioned above, and at least one monitoring unit, which is configured to at least monitor the battery cell unit; the monitoring unit being formed at least partially by the electrically conductive plastic element. A high degree of protection of a storage battery device may be provided in an advantageous manner. A simple type of construction of a monitoring unit for a storage battery device may be provided in an advantageous manner. In particular, the monitoring unit is at least configured to monitor the voltages of the individual battery cells. In particular, the monitoring unit includes a regulating and/or control unit. In particular, the regulating and/or control unit is situated on the circuit board. In particular, the regulating and/or control unit is at least configured to measure the voltages of the battery cells, which are connected electrically to the regulating and/or control unit, in particular, via at least the electrically conductive plastic element, the further electrically conductive plastic element, the additional electrically conductive plastic elements, and/or the other additional electrically conductive plastic elements, in particular, with the aid of the circuit board. 
     In addition, it is provided that the storage battery device include at least one battery cell unit, in particular, the one already mentioned above, and at least one electrical circuit protection unit, which is configured to protect at least the battery cell unit and/or the electronics unit at least from damage due to a short circuit; the electrical circuit protection unit being formed at least partially by the electrically conductive plastic element. A high level of protection of a storage battery device from heat damage, in particular, heat damage able to be caused by high currents, may be provided in an advantageous manner. In particular, the electrical circuit protection unit is formed by the electrically conductive plastic element and/or the further electrically conductive plastic element. In particular, the electrically conductive plastic element and/or the further electrically conductive plastic element is/are designed to warm up at least in the event of a short circuit. 
     In accordance with an example embodiment of the present invention, it is further provided that the storage battery device include at least one battery cell unit, in particular, the one already mentioned above, and at least one heating unit, in particular, the one already mentioned above, which is intended at least for heating the battery cell unit; the heating unit being formed at least partially by the electrically conductive plastic element. A high degree of functionality of an electrically conductive plastic element may be advantageously achieved. A high degree of protection of a storage battery device from low-temperature damage may be achieved in an advantageous manner. In particular, the heating unit is formed by at least the electrically conductive plastic element, the further electrically conductive plastic element, and at least the additional electrically conductive plastic element, preferably, a plurality of additional electrically conductive plastic elements. In particular, the electrically conductive plastic element is connected electrically to the further electrically conductive plastic element. In particular, the electrically conductive plastic element and the further electrically conductive plastic element are connected electrically via at least the additional electrically conductive plastic element. In particular, between the electrically conductive plastic element and the further electrically conductive plastic element, a voltage may be applied, which is intended to generate a flow of current through at least the electrically conductive plastic element, the further electrically conductive plastic element, and the additional electrically conductive plastic element. In particular, at least warming of the electrically conductive plastic element, the further electrically conductive plastic element, and/or the additional electrically conductive plastic element may be generated by the flow of current through the electrically conductive plastic element, the further electrically conductive plastic element, and the additional electrically conductive plastic element, which means that, in particular, warming of the battery cell unit may be generated, as well. In particular, the monitoring unit includes at least one sensor unit. The sensor unit has, in particular, at least one temperature sensor. In particular, the regulating and/or control unit is at least configured to apply at least one voltage at least between the electrically conductive plastic element and the further electrically conductive plastic element, preferably, as a function of a parameter, in particular, a temperature parameter, such as a battery cell temperature, an ambient temperature, or the like. In particular, the temperature parameter is measurable at least by the temperature sensor. In particular, the electrically conductive plastic element and the further electrically conductive plastic element each have a cross-sectional diameter, which is preferably greater than a cross-sectional diameter of the additional electrically conductive plastic element. It is also possible for the cross-sectional diameter of the electrically conductive plastic element, the cross-sectional diameter of the further electrically conductive plastic element, and the cross-sectional diameter of the additional electrically conductive plastic element to be at least substantially identical, preferably, identical, to each other. 
     In addition, it is provided that the electronics unit include at least one operating element, in particular, a pushbutton element, which is formed at least partially by the electrically conductive plastic element. An electronics unit, which allows a particularly simple type of construction of an operating element, may be provided in an advantageous manner. In particular, the operating element is positioned at least partially on the housing unit. In particular, the operating element is movably supported at least partially on the housing unit. In particular, the operating element is formed at least by a pushbutton, the electrically conductive plastic element, and the further electrically conductive plastic element; the electrically conductive plastic element and/or the further electrically conductive plastic element preferably being made of an electrically conductive elastomer. The electrically conductive plastic element and the further electrically conductive plastic element are preferably positioned at least partially between the pushbutton and the battery cell unit, which are positioned so as to be set apart from each other, in particular, in a rest state. In particular, the electrically conductive plastic element and/or the further electrically conductive plastic element is/are designed to deform under a force applied to the pushbutton; the force pointing, in particular, in a direction facing the battery cell unit. In particular, the electrically conductive plastic element and/or the further electrically conductive plastic element is/are configured to deform, in such a manner, due to the force applied to the pushbutton during manipulation of the operating element, that the electrically conductive plastic element contacts the further electrically conductive plastic element directly. 
     It is further proposed that the storage battery device include at least one battery cell unit, in particular, the one already mentioned above, and at least one evaluation unit, which is configured to evaluate a code of the battery cell unit; the code being formed at least partially by the electrically conductive plastic element. A code of a battery cell unit may be advantageously produced in a particularly simple manner. A “code” is to be understood, in particular, as a parameter, preferably, an identification parameter, such as a type of storage battery or the like. In particular, it is possible for the code to be a function of, for example, at least a number of cell holder units, a number of battery cells, a voltage of the battery cells, a configuration of the battery cells, and/or the like. In particular, the evaluation unit is situated on the circuit board. In particular, it is possible for the evaluation unit to be formed in one piece with the circuit board. In particular, the circuit board has at least one contact point, preferably, at least a plurality of contact points. In particular, the contact points are connected electrically to the evaluation unit by electrical conductors, such as a wire, a circuit trace, or the like. In particular, a coding element of the code, which may be read out, in particular, by the evaluation unit, may be generated by an electrical connection of particular contact points via at least the electrically conductive plastic element. In particular, it is possible that at least with the aid of the further electrically conductive plastic element, at least a further coding element of the code of the battery cell unit is formed at least partially by an electrical connection of particular contact points, which are, in particular, different from the contact points that are connected electrically via the electrically conductive plastic element In particular, it is possible that along a major axis of extension of the electrically conductive plastic element, the further electrically conductive plastic element has a maximum length, which is, in particular, different from a maximum length of the further electrically conductive plastic element along a major axis of extension of the further electrically conductive plastic element. In this context, a “major axis of extension” of an object is to be understood, in particular, as an axis, which runs parallelly to the longest edge of the smallest geometric, right parallelepiped, which only just encloses the object completely. It is also possible for the maximum length of the electrically conductive plastic element along the major axis of extension to correspond to the maximum length of the further electrically conductive plastic element along the major axis of extension. In particular, it is possible for the evaluation unit to include at least one reference element, which is formed, in particular, at least by two further contact points of the circuit board and the additional electrically conductive plastic element. In particular, the reference element is situated on the circuit board. In particular, the reference element is electrically connected to the evaluation unit by at least one electrical conductor, preferably, two electrical conductors. In particular, the reference element is formed independently of the code of the battery cell unit. In particular, the evaluation unit is configured to measure a resistance value of the reference element and to compare it to the code. 
     Furthermore, a battery pack including a storage battery device of the present invention is provided in accordance with an example embodiment of the present invention. A high degree of protection of a battery pack may be ensured in an advantageous manner. A simple type of construction of a battery pack having a high degree of functionality may be advantageously provided. In particular, the battery pack has a battery pack housing. The battery pack housing is preferably formed in one piece with the housing unit of the storage battery device. However, it is also possible for the battery pack housing to be formed separately from the housing unit and to surround the housing unit of the storage battery device at least for the most part and/or to contain the housing unit of the storage battery device. The battery pack is preferably equipped for use with a handheld power tool. However, it is also possible for the battery pack to be configured for other devices appearing practical to one skilled in the art, such as portable communications devices, portable home electronics, or the like. 
     In addition, a handheld power tool having an, in particular, exchangeable battery pack of the present invention is provided. A high degree of readiness for operation of a handheld power tool may be achieved in an advantageous manner. In particular, it is possible for the handheld power tool to include a battery pack holding fixture, which is designed to secure the battery pack detachably. The handheld power tool may take the form of a chipping hammer, hammer drill, drill, cordless screwdriver, sander, milling machine, garden machine, or other handheld power tool appearing useful to one skilled in the art. In particular, the handheld power tool includes a housing. In particular, it is possible for the battery pack to be situated at least substantially completely, preferably, completely, inside the housing of the handheld power tool. In particular, at least the electrically conductive plastic element, the further electrically conductive plastic element, and/or the additional electrically conductive plastic element is/are situated outside of the housing. It is also possible for at least the electrically conductive plastic element, the further electrically conductive plastic element, and/or the additional electrically conductive plastic element to be situated inside the housing. It is also possible for at least the electrically conductive plastic element, the further electrically conductive plastic element, and/or the additional electrically conductive plastic element to be surrounded by the housing at least substantially completely, particularly preferably, completely. 
     In addition, a method for manufacturing a storage battery device, in particular, of the present invention, for a battery pack of a handheld power tool, is provided; in at least one method step, at least one electrically conductive plastic element, in particular, the electrically conductive plastic element already mentioned above, of an electronics unit, in particular, the one already mentioned previously, of the storage battery device, being manufactured at least partially in a dispensing method or a 3-D printing method. Particularly simple manufacturing of an electrically conductive plastic element of an electronics unit may be implemented in an advantageous manner. In particular, in at least one method step, a molded element of at least the electrically conductive plastic element is manufactured in a single-component injection molding method. In particular, in at least one further method step, an electrically conductive material, in particular, e.g., an electrically conductive sealing compound, an electrically conductive adhesive agent, or the like, is dispensed onto the molded element of the electrically conductive plastic element. It is also possible that in at least one further method step, the electrically conductive material is deposited onto the molded element in a 3-D printing method. It is also possible that in at least one method step, the electrically conductive plastic element is manufactured completely in a 3-D printing method. It is also possible that in at least one method step, at least the electrically conductive plastic element is manufactured in a two-component injection molding method. 
     In this connection, the storage battery device of the present invention, the battery pack of the present invention, the handheld power tool of the present invention, and/or the method of the present invention shall not be limited to the use and specific embodiment described above. In particular, in order to achieve a functionality described here, the storage battery device of the present invention, the battery pack of the present invention, the handheld power tool of the present invention, and/or the method of the present invention may have a number of individual elements, component parts and units, as well as method steps, different from a number mentioned here. In addition, in the ranges of values indicated in this description, values lying within the above-mentioned limits are also to be acknowledged as described and as applicable as desired. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Further advantages of the present invention are derived from the description of the figures that follows. Five exemplary embodiments of the present invention are represented in the figures. The figures and the description include numerous features in combination. One skilled in the art will necessarily consider the features individually, as well, and unite them to form useful, further combinations. 
         FIG. 1  shows a schematic representation of a handheld power tool of the present invention, including a battery pack of the present invention and a storage battery device of in accordance with an example embodiment of the present invention. 
         FIG. 2 a    shows a front view of a schematic representation of a first variant of the storage battery device according to an example embodiment of the present invention. 
         FIG. 2 b    shows a side view of a schematic representation of the first variant of the storage battery device according to an example embodiment of the present invention. 
         FIG. 3  shows a side view of a schematic representation of a second variant of the storage battery device according to an example embodiment of the present invention. 
         FIG. 4  shows a top view of a schematic representation of a third variant of the storage battery device according to an example embodiment of the present invention. 
         FIG. 5  shows a side view of a schematic representation of a fourth variant of the storage battery device according to an example embodiment of the present invention. 
         FIG. 6  shows a schematic representation of a bottom side of a circuit board of a fifth variant of the battery storage device according to an example embodiment of the present invention. 
         FIG. 7  shows a schematic flow chart of a method of the present invention for manufacturing a storage battery device according to an example embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF EXAMPLE EMBODIMENTS 
       FIG. 1  shows a handheld power tool  14   a  having an, in particular, exchangeable battery pack  12   a ; handheld power tool  14   a  taking the form of a battery-operated hammer drill. Battery pack  12   a  is configured to supply an electrical load circuit  90   a , in particular, an electric motor  92   a , at least with electrical power. Handheld power tool  14   a  includes a housing  40   a . Electrical load circuit  90   a  is provided for propelling a tool holding fixture  94   a , in particular, in a rotary manner; a tool  96   a  being able to be secured in tool holding fixture  94   a . Battery pack  12   a  is detachably mounted to housing  40   a  and includes a storage battery device  10   a.    
       FIG. 2 a    and  FIG. 2 b    show a front view ( FIG. 2 a   ) and a side view ( FIG. 2 b   ) of a first variant of storage battery device  10   a ; storage battery device  10   a  including at least one electronics unit  16   a , which has at least one circuit board  18   a . Electronics unit  16   a  includes at least one electrically conductive plastic element  20   a , in particular, an electrically conductive elastomer  22   a , which is electrically connected to at least circuit board  18   a . Electrically conductive plastic element  20   a  is made completely of a conductive plastic. Electrically conductive plastic element  20   a  is partially wire-shaped and partially planar. Electrically conductive plastic element  20   a  is configured to electrically connect at least circuit board  18   a  to at least a further unit and/or one further element of storage battery device  10   a . Electrically conductive plastic element  20   a  is configured to electrically connect at least circuit board  18   a  to a battery cell unit  26   a  of storage battery device  10   a . Battery cell unit  26   a  includes at least one cell holder unit  42   a , which has a plurality of battery cells  44   a . Cell holder unit  42   a  is configured to hold battery cells  44   a . Battery cells  44   a  of cell holder unit  42   a  are interconnected electrically by a cell connector  46   a  and a further cell connector  48   a . Cell connector  46   a  is positioned at negative poles of battery cells  44   a  and connected to the negative poles electrically. Further cell connector  48   a  is positioned at positive poles of battery cells  44   a  and connected to the positive poles electrically. Battery cells  44   a  take the form of lithium ion cells. Electrically conductive plastic element  20   a  is connected electrically to the negative poles of battery cells  44   a  via cell connector  46   a . Electrical contact elements  50   a , which are intended for electrical contacting, and/or contacting enabling data exchange, of battery device  10   a  to mating contact elements of handheld power tool  14   a  and/or to mating contact elements of a battery charger, are situated on circuit board  18   a . Circuit board  18   a  is situated on battery cell unit  26   a  of storage battery device  10   a . Circuit board  18   a  is positioned at battery cell unit  26   a  so as to be set apart from it by spacing elements  52   a . Contact elements  50   a  are situated on a side of circuit board  18   a , which is opposite to a further side of circuit board  18   a , on which spacing elements  52   a  are situated. Battery cell unit  26   a  is at least partially connected to electrical contact elements  50   a  of circuit board  18   a  electrically, via at least electrically conductive plastic element  20   a . Circuit board  18   a  includes at least one electrical contact surface  54   a , at which electrically conductive plastic element  20   a  is situated. Electrical contact surface  54   a  is positioned so as to be set apart from electrical contact elements  50   a . Electrically conductive plastic element  20   a  is pressed against electrical contact surface  54   a.    
     Electronics unit  16   a  includes at least one further electrically conductive plastic element  56   a , which is formed identically to electrically conductive plastic element  20   a . Further electrically conductive plastic element  56   a  is connected electrically to the positive poles of battery cells  44   a  via further cell connector  48   a . Further electrically conductive plastic element  56   a  is situated on a further electrical contact surface  58   a  of circuit board  18   a . Further electrical contact surface  58   a  is positioned so as to be set apart from electrical contact elements  50   a  and to be opposite to electrical contact surface  54 . Further electrically conductive plastic element  56   a  is pressed against further electrical contact surface  58   a . Battery cell unit  26   a  includes at least two further cell holder units  60   a . One of the further cell holder units  60   a  has a number of battery cells  44   a , which is different from a number of battery cells  44   a  of cell holder unit  42   a . Electronics unit  16   a  includes at least a plurality of additional electrically conductive plastic elements  62   a  and a plurality of other additional electrically conductive plastic elements (not shown explicitly). Additional electrically conductive plastic elements  62   a  and the other additional electrically conductive plastic elements are formed at least substantially identically to electrically conductive plastic element  20   a . Further cell holder units  60   a  are connected electrically to circuit board  18   a  via additional electrically conductive plastic elements  62   a  and the other additional electrically conductive plastic elements. Further cell holder units  60   a  and cell holder unit  42   a  are positioned so as to be set apart from each other. At least electrically conductive plastic element  20   a  and further electrically conductive plastic element  56   a  are positioned so as to be set apart from additional electrically conductive plastic element  62   a  and the other additional electrically conductive plastic element. 
     Electrically conductive plastic element  20   a  has at least an electrical conductivity in a range of 10 −13  S cm −1  to 10 3  S cm −1 . Electrically conductive plastic element  20   a  is designed to transmit electrical power, in particular, an electrical signal. Further electrically conductive plastic element  56   a , additional electrically conductive plastic elements  62   a , and the other additional electrically conductive plastic elements have an electrical conductivity, which corresponds at least substantially to the electrical conductivity of electrically conductive plastic element  20   a.    
     Storage battery device  10   a  includes at least one housing unit  24   a ; electrically conductive plastic element  20   a  being situated on battery cell unit  26   a  and/or on housing unit  24   a . Electrically conductive plastic element  20   a  is positioned at least substantially completely between housing unit  24   a  and battery cell unit  26   a . Electrically conductive plastic element  20   a  surrounds battery cell unit  26   a  at least partially. Housing unit  24   a  has at least one lateral cover  64   a . Lateral cover  64   a  is situated on battery cell unit  26   a;    
     battery cell unit  26   a  being surrounded at least partially by lateral cover  64   a . Electrically conductive plastic element  20   a  is positioned between lateral cover  64   a  and battery cell unit  26   a ; electrically conductive plastic element  20   a  being surrounded at least substantially completely by lateral cover  64   a . Lateral cover  64   a  forms a shoulder  66   a , which faces circuit board  18   a . Shoulder  66   a  has a free end  68   a , which is opposite to electrical contact surface  54   a  of circuit board  18   a . Free end  68  of shoulder  66   a  of lateral cover  64   a  is situated so as to be set apart from electrical contact surface  54   a . Electrically conductive plastic element  20   a  is positioned at least partially between lateral cover  64   a , in particular, free end  68   a , and circuit board  18   a , in particular, electrical contact surface  54   a  of circuit board  18   a . Electrically conductive plastic element  20   a  is forced against circuit board  18   a  and against cell connector  46   a  by lateral cover  64   a . Electrically conductive plastic element  20   a  is guided partially through lateral cover  64   a  and battery cell unit  26   a.    
     Further electrically conductive plastic element  56   a  is positioned at least substantially completely between housing unit  24   a  and battery cell unit  26   a ; further electrically conductive plastic element  56   a  surrounding battery cell unit  26   a  at least partially. Housing unit  24   a  has a further lateral cover  70   a , which is situated on battery cell unit  26   a , in particular, cell holder unit  42   a . Battery cell unit  26   a  is surrounded at least partially by further lateral cover  70   a . Further electrically conductive plastic element  56   a  is situated at least partially between further lateral cover  70   a  and battery cell unit  26   a ; further electrically conductive plastic element  56   a  being surrounded at least substantially completely by further lateral cover  70   a . Further lateral cover  70   a  is formed at least substantially identically to lateral cover  64   a . A free end  72   a  of a shoulder  74   a  of further lateral cover  70   a  is opposite to further electrical contact surface  58   a  of circuit board  18   a ; free end  72   a  of further lateral cover  70   a  being positioned so as to be set apart from further electrical contact surface  58   a . Further electrically conductive plastic element  56   a  is positioned at least partially between further lateral cover  70   a , in particular, free end  72   a  of shoulder  74   a  of further lateral cover  70   a , and further electrical contact surface  58   a  of circuit board  18   a ; further electrically conductive plastic element  56   a  being forced against circuit board  18   a  and against further cell connector  48   a  by further lateral cover  70   a . Further electrically conductive plastic element  62   a  is guided at least partially through further lateral cover  70   a  and battery cell unit  26   a.    
     Storage battery device  10   a  includes at least one monitoring unit  28   a , which is intended at least for monitoring battery cell unit  26   a ; monitoring unit  28   a  being formed at least partially by electrically conductive plastic element  20   a . Monitoring unit  28   a  is at least configured to monitor the voltages of battery cells  44   a ; monitoring unit  28   a  including a regulating and/or control unit  76   a . Regulating and/or control unit  76   a  is situated on circuit board  18   a  and is at least configured to measure the voltages of battery cells  44   a , which are connected electrically to regulating and/or control unit  76   a  via electrically conductive plastic element  20   a , further electrically conductive plastic element  56   a , additional electrically conductive plastic elements  62   a , and/or the other additional electrically conductive plastic elements, in particular, with the aid of circuit board  18   a.    
     In addition, storage battery device  10   a  includes at least one electrical circuit protection unit  30   a , which is configured to protect at least battery cell unit  26   a  and/or electronics unit  16   a  at least from damage due to a short circuit; electrical circuit protection unit  30   a  being formed at least partially by electrically conductive plastic element  20   a . Electrical circuit protection unit  30   a  is formed by at least electrically conductive plastic element  20   a , further electrically conductive plastic element  56   a , additional electrically conductive plastic elements  62   a , and/or the other additional electrically conductive plastic elements, which is/are configured to warm up at least in response to a short circuit. 
     Further exemplary embodiments of the present invention are shown in  FIGS. 3 through 6 . The following descriptions and the figures are limited mainly to the differences between the exemplary embodiments; with regard to identically designated components, in particular, with regard to components having the same reference characters, reference also being able to be made, in principle, to the figures and/or the description of the other exemplary embodiments, in particular, of  FIGS. 1, 2   a  and  2   b . In order to distinguish between the exemplary embodiments, the letter “a” follows the reference numerals of the exemplary embodiment in  FIGS. 1, 2   a  and  2   b . In the exemplary embodiments of  FIGS. 3 through 6 , the letter “a” is replaced by the letters “b” through “e.” 
       FIG. 3  shows a second variant of storage battery device  10   b ; an electrically conductive plastic element  20   b  being molded into a battery cell unit  26   b  of storage battery device  10   b  and/or into a housing unit of storage battery device  10   b . At least electrically conductive plastic element  20   b  is extruded onto a cell holder unit  42   b  and/or onto a cell connector  46   b . A circuit board  18   b  includes an additional electric contact surface  78   b , which is situated opposite to battery cell unit  26   b . Electrically conductive plastic element  20   b  is connected electrically to additional electrical contact surface  78   b . A further electrically conductive plastic element  56   b  is extruded onto cell holder unit  42   b  and/or onto a further cell connector  48   b . Further electrically conductive plastic element  56   b  is connected electrically to additional electrical contact surface  78   b.    
       FIG. 4  shows a third variant of a storage battery device  10   c , which includes at least one heating unit  32   c  that is configured to heat a battery cell unit  26   c ; heating unit  32   c  being formed at least partially by an electrically conductive plastic element  20   c . Heating unit  32   c  is formed by electrically conductive plastic element  20   c , a further electrically conductive plastic element  56   c  and additional electrically conductive plastic elements  62   c . Electrically conductive plastic element  20   c  is connected electrically to further electrically conductive plastic element  56   c  via additional electrically conductive plastic elements  62   c ; a voltage being able to be applied between electrically conductive plastic element  20   c  and further electrically conductive plastic element  56   c , the voltage being intended to generate a flow of current through at least electrically conductive plastic element  20   c , further electrically conductive plastic element  56   c , and additional electrically conductive plastic elements  62   c . At least warming of the electrically conductive plastic element  20   c , further electrically conductive plastic element  56   c , and/or additional electrically conductive plastic elements  62   c  may be generated by the flow of current through electrically conductive plastic element  20   c , further electrically conductive plastic element  56   c , and additional electrically conductive plastic elements  62   c , which means that warming of battery cell unit  26   c  may be induced, as well. A regulating and/or control unit  76   c  is configured to apply a voltage between electrically conductive plastic element  20   c  and further electrically conductive plastic element  56   c . It is possible for regulating and/or control unit  76   a  to apply a voltage as a function of a temperature parameter, which is measurable, in particular, by a temperature sensor. Electrically conductive plastic element  20   c  and further electrically conductive plastic element  56   c  each have a cross-sectional diameter, which is greater than a cross-sectional diameter of additional electrically conductive plastic elements  62   c.    
       FIG. 5  shows a fourth variant of a storage battery device  10   d , which includes at least an electronics unit  16   d . Electronics unit  16   d  includes at least one operating element  34   d , in particular, a pushbutton element  36   d , which is formed at least partially by an electrically conductive plastic element  20   d . Operating element  34   d  is formed by a pushbutton  80   d , electrically conductive plastic element  20   d , and a further electrically conductive plastic element  56   d . At least electrically conductive plastic element  20   d  takes the form of an electrically conductive elastomer  22   d . It is possible for further electrically conductive plastic element  56   d  to take the form of a further electrically conductive elastomer. Electrically conductive plastic element  20   d  and further electrically conductive plastic element  56   d  are positioned at least partially between pushbutton  80   d  and a battery cell unit  26   d  of storage battery device  10   d , which are positioned so as to be set apart from each other in a rest state. Electrically conductive plastic element  20   d  and further electrically conductive plastic element  56   d  are designed to deform under a force applied to pushbutton  80   d ; the force pointing in a direction facing battery cell unit  26   d . Electrically conductive plastic element  20   d  and further electrically conductive plastic element  56   d  are also configured to deform, in such a manner, due to the force applied to pushbutton  80   d  during manipulation of operating element  34   d , that electrically conductive plastic element  20   d  contacts further electrically conductive plastic element  56   d  directly. 
     In a fifth variant,  FIG. 6  shows a bottom side of a circuit board  18   e  of a storage battery device  10   e , which includes at least one evaluation unit  38   e ; evaluation unit  38   e  being configured to evaluate a code of a battery cell unit ( 26   e , not shown explicitly); the code being formed at least partially by an electrically conductive plastic element  20   e . Evaluation unit  38   e  is situated on circuit board  18   e ; circuit board  18   e  having a plurality of contact points  82   e . Contact points  82   e  are connected electrically to evaluation unit  38   e  via electrical conductors  84   e . The electrical connection of certain contact points  82   e  with the aid of electrically conductive plastic element  20   e  is intended to generate a coding element of the code, which may be read out by evaluation unit  38   e . Further coding elements of the code are formed by an electrical connection of particular contact points  82   e  with the aid of a further electrically conductive plastic element  56   e  and additional electrically conductive plastic elements  62   e ; the particular contact points being different from the contact points  82   e  that are connected electrically by electrically conductive plastic element  20   e.    
       FIG. 7  schematically shows a method for manufacturing a storage battery device  10   a - e  for a battery pack  12   a - e  of a handheld power tool  14   a - e . In at least one method step  86 , a molded element of an electrically conductive plastic element  20   a - e  is manufactured in a single-component injection molding method. In at least one further method step  88 , at least one electrically conductive plastic element  20   a - e  of an electronics unit  16   a - e  of storage battery device  10   a - e  is manufactured at least partially in a dispensing method or a 3-D printing method. In further method step  88 , an electrically conductive material, in particular, e.g., an electrically conductive sealing compound, an electrically conductive adhesive agent, or the like, is dispensed onto the molded element or deposited onto the molded element in a 3-D printing method.