JP3789853B2 - Battery pack - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a battery pack in which battery terminals are exposed to the outside from an electrode window of a case.
[0002]
[Prior art]
It is important for the battery pack to place the battery terminals in the correct positions. This is because the position shift of the battery terminal causes a contact failure in a state where the battery terminal is mounted on the electric device. The displacement of the battery terminal occurs due to a dimensional error of a built-in secondary battery, a displacement of a component to be mounted, a deformation of a portion where the battery terminal is disposed, or the like. In order to arrange the battery terminals at the correct position of the case, for example, as shown in FIG. 1, a battery pack incorporating a holder 22 has been developed. In this battery pack, a substrate 21 to which battery terminals are fixed is arranged at a fixed position by a holder 22. This structure has a disadvantage that the manufacturing cost increases because the number of components increases because the holder 22 that is separately molded is built in the case 20.
[0003]
Further, a battery pack having a structure shown in FIG. 2 has been developed as a battery pack for preventing the displacement of the battery terminal due to the dimensional error of the secondary battery (Japanese Patent Laid-Open No. 11-283589). This battery pack has a structure in which a substrate 31 that fixes a battery terminal 33 is disposed at an end of a secondary battery 32 and the substrate 31 is sandwiched between two cases 30. In the battery pack having this structure, the dimensional error of the secondary battery 32 does not cause the position of the substrate 31 to be distorted.
[0004]
[Problems to be solved by the invention]
However, in the battery pack of FIGS. 1 and 2, it is difficult to fix the battery terminals so as not to be displaced to a satisfactory degree. This is because the position of the battery terminal is shifted due to deformation of the holder or the case. In particular, the device terminal of the electric device is elastically pressed on the battery terminal of the battery pack in order to reduce contact failure as much as possible. For this reason, it will be in the state always pressed by the apparatus terminal in the state with which it mounts | wears with an electric apparatus. Therefore, it is important that the battery terminal of the battery pack is firmly fixed in place so that the position of the battery terminal does not shift even when continuously pressed.
[0005]
The present invention was developed for the purpose of realizing this, and an important object of the present invention is to have an extremely simple structure, without incorporating a dedicated part for fixing the battery terminal, An object of the present invention is to provide a battery pack that can reliably prevent displacement of battery terminals using a structure necessary for mounting on a device.
[0006]
[Means for Solving the Problems]
The battery pack of the present invention accommodates a terminal board 3 that fixes battery terminals 4, a secondary battery 2 that connects the terminal board 3, the terminal board 3 and the secondary battery 2, and a bottom surface. A first case 1A that has a peripheral wall around the inner wall and houses the terminal substrate 3 and the secondary battery 2 inside the peripheral wall, and a second case that is connected to the peripheral wall of the first case 1A and closes the opening. Case 1B is provided. The terminal board 3 is connected to the secondary battery 2 in a posture parallel to the bottom surface of the first case 1A, is separated from the bottom surface of the first case 1A, approaches the inner surface of the second case 1B, and the first case. It arrange | positions along the inner side of the holder parallel surrounding wall 10 which comprises one side of the surrounding wall of 1A. Further, the terminal substrate 3 has a plurality of battery terminals 4 fixed to the surface side facing the inner surface of the second case 1B. The second case 1B has an electrode window 9 that exposes the battery terminal 4 fixed to the terminal substrate 3 to the outside. Further, the first case 1A has a fitting recess for mounting the battery pack at a fixed position of the electric device at a position facing the back side of the terminal board 3 that is opposite to the side where the battery terminal 4 is fixed. 11 is provided so as to protrude from the bottom surface to the inner surface. The fitting recess 11 includes a pair of end ribs 12 projecting from the bottom surface toward the terminal substrate 3 in a direction orthogonal to both the holder parallel peripheral wall 10 and the bottom surface of the first case 1A, and a holder parallel to the bottom surface. A parallel rib 13 projecting from the bottom so as to connect the pair of end ribs 12 in a posture parallel to the peripheral wall 10, and an edge opposite to the bottom surface of the parallel rib 13 and the end rib 12 are connected. The closing plate portion 14 is formed. The end ribs 12, the parallel ribs 13, and the closing plate portion 14 that are orthogonal to each other are integrally formed of plastic that molds the first case 1A, and the fitting recess 11 is provided in the first case 1A. . The fitting recess 11 constituted by the end ribs 12, the parallel ribs 13, and the closing plate portion 14 protrudes to the back side of the terminal board 3 and supports the terminal board 3 from the back side.
[0007]
The fitting recess 11 can be disposed in the vicinity of the back surface of the terminal board 3 on which the battery terminals 4 are provided. Further, the fitting recess 11 can be disposed between the plurality of battery terminals 4. Furthermore, the fitting recess 11 can be provided with a protruding portion 15 that protrudes from the closing plate portion 14 to the terminal substrate 3, and the protruding portion 15 can support the bottom surface of the terminal substrate 3. The protrusion 15 can be disposed between the battery terminals 4. Further, the terminal board 3 can be arranged by separating the + -battery terminals 4 and the fitting recesses 11 can be arranged between the + -battery terminals 4.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. However, the example shown below illustrates the battery pack for embodying the technical idea of the present invention, and the present invention does not specify the battery pack as follows.
[0009]
Further, in this specification, in order to facilitate understanding of the scope of claims, the numbers corresponding to the members shown in the examples are referred to as “the scope of claims” and “the means for solving the problems”. It is added to the member shown by. However, the members shown in the claims are not limited to the members in the embodiments.
[0010]
The battery pack shown in FIGS. 3 to 5 stores a terminal board 3 to which battery terminals 4 are fixed, a secondary battery 2 to which the terminal board 3 is connected, a secondary battery 2 and the terminal board 3. The first case 1A and the second case 1B, which are plastic cases, are provided. In the illustrated battery pack, the outer shape of the case 1 is a rectangular box shape, and a thin battery is accommodated therein. However, the present invention does not specify the secondary battery 2 incorporated in the battery pack as a thin battery. This is because the case 1 can accommodate a plurality of cylindrical batteries arranged in parallel on the same surface. The battery pack shown in the figure incorporates a lithium ion secondary battery as the secondary battery 2. As the secondary battery 2, a nickel-hydrogen battery or a nickel-cadmium battery can be used in place of the lithium ion secondary battery.
[0011]
The terminal board 3 has a plurality of battery terminals 4 fixed to an insulating plate 5 such as plastic. The terminal substrate 3 shown in the figure has three battery terminals 4 fixed to the surface side of an elongated rectangular insulating plate 5. In the terminal substrate 3 shown in the figure, the entire length of the insulating plate 5 is substantially equal to the length of the battery end face of the thin battery. The battery terminal 4 is a metal plate. The terminal board 3 shown in the figure is provided with a space 6 in the middle, and + and − battery terminals 4 are arranged on both sides of the space 6. Two battery terminals 4 are provided on one side of the space portion 6, and one of the battery terminals 4 is a signal terminal. The terminal board 3 shown in the figure has a lead plate 7 fixed at both ends and is connected to the secondary battery 2 via the lead plates 7 at both ends. The lead plate 7 is connected to the back surface of the terminal board 3 by soldering. The terminal board 3 is provided with a conductive portion (not shown) for soldering and fixing the lead plate 7 to the back surface. In the illustrated battery pack, one end of one lead plate 7 is fixed to the back surface side of the terminal substrate 3, and the other end of the lead plate 7 is connected to the convex electrode 2 </ b> A of the secondary battery 2 via the protective element 8. ing. The protective element 8 is a PTC or a breaker. The other lead plate 7 has one end fixed to the terminal substrate 3 and the other end connected to an electrode on the outer can side of the secondary battery 2.
[0012]
Further, an electronic component (not shown) for mounting a protection circuit for the secondary battery 2 is mounted on the terminal board 3, and this protection circuit is connected to the signal terminal of the battery terminal 4. The electronic component is provided so as to protrude to the back side of the terminal board 3. However, since the back surface side of the terminal board 3 is supported by the fitting recess 11 protruding from the inner surface of the first case 1 </ b> A, the electronic component is disposed in a portion without the fitting recess 11.
[0013]
The terminal substrate 3 is connected to the secondary battery 2 in a posture orthogonal to the end surface on the convex electrode 2A side of the thin battery, that is, in a posture parallel to the bottom surface of the first case 1A. The terminal substrate 3 exposes the battery terminals 4 from the electrode windows 9 provided in the second case 1B. Accordingly, the terminal board 3 is disposed in the case 1 away from the bottom surface of the first case 1A and close to the inner surface of the second case 1B. Furthermore, the battery pack of the figure arrange | positions the terminal board 3 along the inner side of the holder parallel surrounding wall 10 which comprises one side of the surrounding wall of 1 A of 1st cases. And the terminal board 3 has fixed the some battery terminal 4 to the surface side facing the inner surface of the 2nd case 1B. In the second case 1B, an electrode window 9 is opened at a position where the battery terminal 4 fixed to the terminal substrate 3 is exposed to the outside. In the illustrated battery pack, the three battery terminals 4 are fixed to the terminal substrate 3, so that three electrode windows 9 are opened in the second case 1 </ b> B.
[0014]
The first case 1A supports the terminal board 3 from the back surface, and is integrally provided with a fitting recess 11 for fitting and mounting the battery pack at a fixed position of the electric device. The fitting recess 11 is located at a position facing the back side of the terminal board 3 and is further arranged at a position where the battery pack is mounted at a fixed position of the electric device. The fitting recess 11 is provided so as to protrude from the bottom surface of the first case 1A to the inner surface. The first case 1A shown in the figure has a rectangular bottom surface and a peripheral wall around it. The peripheral wall of one side is a holder parallel peripheral wall 10, and the fitting recess 11 is provided close to the holder parallel peripheral wall 10.
[0015]
The fitting recess 11 is formed by integrally forming a pair of end ribs 12, parallel ribs 13, and a closing plate portion 14 in the first case 1A. The pair of end ribs 12 are formed so as to protrude from the bottom surface toward the terminal substrate 3 in a direction orthogonal to both the holder parallel peripheral wall 10 and the bottom surface of the first case 1A. The parallel ribs 13 are provided so as to protrude from the bottom surface so as to connect the pair of end ribs 12 in a posture orthogonal to the pair of end ribs 12 and the bottom surface and parallel to the holder parallel peripheral wall 10. The closing plate portion 14 is formed so as to connect the end edges of the parallel ribs 13 and the end ribs 12 opposite to the bottom surfaces. The end ribs 12, the parallel ribs 13, and the closing plate portion 14 that are orthogonal to each other are integrally formed of plastic that molds the first case 1A, and the fitting recess 11 is provided in the first case 1A. Yes. In the illustrated battery pack, a recess is provided in a part of the holder parallel peripheral wall 10 of the first case 1A, and a fitting recess 11 is formed therein. The fitting recess 11 is formed by a pair of end ribs 12, parallel ribs 13, and a closing plate portion 14. The fitting recess 11 protrudes toward the back surface side of the terminal substrate 3 on the inner surface side of the first case 1 </ b> A and supports the back surface of the terminal substrate 3. Since the fitting recess 11 protrudes to the inner surface side of the first case 1A, it becomes a recess on the surface side of the first case 1A. The fitting recess 11 guides a fitting projection (not shown) provided in the battery pack mounting portion of the electrical device when the battery pack is mounted on the electrical device, and mounts the battery pack in a fixed position. To do.
[0016]
The fitting recess 11 supports the terminal board 3 from the back surface and prevents the battery terminal 4 fixed to the terminal board 3 from being pushed and displaced. Therefore, the fitting recess 11 abuts on the back surface of the terminal board 3 or approaches with almost no gap to support the terminal board 3 from the back surface.
[0017]
In the illustrated battery pack, a fitting recess 11 is disposed in the vicinity of the back surface of the terminal board 3 on which the battery terminals 4 are provided. In the illustrated battery pack, the fitting recess 11 is disposed between the battery terminals 4. Since this battery pack has the battery terminals 4 arranged on both sides of the portion supported by the fitting recess 11, there is a feature that a plurality of battery terminals 4 can be supported in a balanced manner by the fitting recess 11. However, the battery pack of the present invention can also support the outside of the plurality of battery terminals, in other words, the end side of the battery terminals with the fitting recess. However, in the battery pack in which the fitting recess is arranged closer to the end than the battery terminal, the fitting recess is arranged in the vicinity of the battery terminal. In this specification, disposing the fitting recess in the vicinity of the battery terminal means a state in which the fitting recess is arranged closer to the battery terminal than the end of the terminal board.
[0018]
The fitting recess 11 can also support the back surface of the terminal substrate 3 with the closing plate portion 14, but the battery pack shown in the figure has a protrusion 15 in the fitting recess 11, Supports the back side. The fitting recess 11 in the figure is provided with a protruding portion 15 so as to protrude from the closing plate portion 14 to the terminal board 3. The protruding portion 15 is provided so as to protrude from the pair of end ribs 12 toward the terminal substrate 3. One or a plurality of the protruding portions 15 can be provided so as to protrude from the closing plate portion 14 toward the terminal substrate 3. The first case 1 </ b> A in the figure protrudes from the end rib 12 and is provided with a pair of protrusions 15.
[0019]
In the illustrated first case 1 </ b> A, the fitting recess 11 is disposed between the battery terminals 4, and the protruding portion 15 is disposed on the back surface of the space portion 6 provided between the battery terminals 4. The protrusions 15 are arranged between the battery terminals 4 that are arranged apart from each other. However, the protruding portion can be disposed between adjacent battery terminals that are close to each other. Moreover, a pair of protrusion part can be arrange | positioned on the outer side of a some battery terminal, and a some battery terminal can also be arrange | positioned between protrusion parts. The projecting portion disposed outside the battery terminal is disposed close to the battery terminal in order to firmly support the battery terminal.
[0020]
The second case 1B is provided with a peripheral wall connected to the peripheral wall of the first case 1A. The first case 1A and the second case 1B have the same outer shape, and a peripheral wall is provided around them. The case 1 having this structure connects the peripheral walls of the first case 1A and the second case 1B, and houses the terminal substrate 3 and the secondary battery 2 therein. The peripheral walls are connected by a structure such as ultrasonic welding, adhesion, and fitting. In the illustrated battery pack, the peripheral wall is provided in the second case 1B, but the peripheral wall is not necessarily provided in the second case. In this battery pack, the peripheral wall of the first case is raised and the periphery of the second case molded in a plate shape is connected to the opening to close the case.
[0021]
Further, the second case 1B shown in FIG. 5 is provided with the vertical rib 16 integrally formed so as to protrude from the inner surface. The vertical ribs 16 are provided in parallel with the holder parallel peripheral wall 10 of the first case 1 </ b> A, and are inserted between the terminal substrate 3 and the secondary battery 2. In this case 1, both sides of the terminal board 3 are sandwiched between the holder parallel peripheral wall 10 and the vertical rib 16, and the terminal board 3 is accurately placed at a fixed position. In particular, the terminal board 3 is fixed at an accurate position of the case 1 regardless of the dimensional error of the secondary battery 2.
[0022]
Secondary batteries cannot eliminate dimensional errors from the manufacturing process. This error is considerably larger than the error of the case of a plastic molded product. For this reason, if a terminal board is positioned with a secondary battery, a position shifts with the dimensional error. In the illustrated battery pack, since the terminal substrate 3 is sandwiched between the vertical ribs 16 and the holder parallel peripheral wall 10 and placed at a fixed position, for example, even if there is a dimensional error in the length of the secondary battery 2, 3 can be placed at an accurate position. Further, the battery pack shown in the figure is provided with a notch 17 in the terminal board 3 and a vertical rib 16 is inserted therein. In this structure, the longitudinal rib 16 can also prevent the longitudinal displacement of the terminal board 3. For this reason, there exists the feature which can arrange | position the terminal board 3 in the very exact position of the case 1. FIG.
[0023]
【The invention's effect】
The battery pack of the present invention has an advantage that the battery terminal can be fixed at a fixed position so as not to be displaced with an extremely simple structure. In particular, the battery terminal can be prevented from being displaced even when the battery terminal is attached to an electric device and is elastically pressed. For this reason, there exists the feature which can reduce the contact failure with the apparatus terminal of the electric equipment resulting from the position shift of a battery terminal. Furthermore, the battery pack of the present invention is for mounting the battery pack on an electric device without incorporating a dedicated part such as a holder formed of plastic into a dedicated shape in order to prevent displacement of the battery terminal. Since the displacement of the battery terminal is reliably prevented while effectively using the fitting recess, the battery terminal can be fixed in place while simplifying the entire structure.
[0024]
In particular, the battery pack of the present invention has a unique arrangement and structure for the terminal board and the case for fixing the battery terminal, and the fitting recess is used to reinforce the case to a tough structure. The terminal substrate is supported from the back surface of the battery terminal by the recess. For this reason, even if it attaches a battery pack to an electric device and the battery terminal is pressed against the device terminal, it can be firmly pressed from the back surface to prevent displacement. That is, the battery pack of the present invention is configured such that the terminal board is in a posture parallel to the bottom surface of the first case, is separated from the bottom surface of the first case, approaches the inner surface of the second case, and further forms one side of the peripheral wall of the first case. A plurality of battery terminals are fixed on the surface side facing the inner surface of the second case, arranged along the inner side of the holder parallel peripheral wall. The first case is provided with a fitting recess for mounting the battery pack at a fixed position on the electric device at a position facing the back side of the terminal board opposite to the side where the battery terminals are fixed. Is provided so as to protrude from the inner surface. Further, the fitting recess is integrally formed with the first case of plastic with a pair of end ribs, parallel ribs, and closing plate portions that are orthogonal to each other. In this way, the fitting recess formed in a box shape with three ribs that are three-dimensionally orthogonal to each other has a shape that is extremely strong and difficult to deform, and the firm box-shaped fitting recess is a terminal. The substrate is supported from the back side. Therefore, even if the terminal board is pressed, the position does not shift, and the box-shaped fitting recess reinforces the case so as not to deform. For this reason, since the fitting recess having a tough structure supports the terminal board from the back surface and prevents the case from being deformed, the battery terminals arranged in this portion are fixed in place without being displaced.
[0025]
Furthermore, in the battery pack according to claim 2 of the present invention, since the fitting recess is disposed in the vicinity of the back surface of the terminal board on which the battery terminal is provided, the battery pack is attached to an electric device, and the device terminal is a battery. Even if the terminal is pressed, the fitting concave portion supports the portion where the battery terminal is provided, so that it is possible to prevent the displacement most effectively.
[0026]
In the battery pack according to claim 3 of the present invention, since the fitting recess is disposed between the plurality of battery terminals, the deformation of the terminal board is ensured even when the plurality of battery terminals are pushed by the device terminals. There is a feature that can be blocked. In the battery pack of claim 4 of the present invention, the end rib is provided with a protruding portion that protrudes from the closing plate portion to the terminal substrate, and the protruding portion supports the bottom surface of the terminal substrate. The battery pack according to claim 5 is characterized in that since the protruding portion is disposed between the battery terminals, the terminal substrate can be firmly supported by the protruding portion.
[Brief description of the drawings]
1 is an exploded perspective view of a conventional battery pack. FIG. 2 is an exploded perspective view of another conventional battery pack. FIG. 3 is a perspective view of a battery pack according to an embodiment of the present invention. FIG. 5 is an exploded perspective view of the battery pack shown in FIG. 4 as viewed from below.
DESCRIPTION OF SYMBOLS 1 ... Case 1A ... 1st case 1B ... 2nd case 2 ... Secondary battery 2A ... Convex part electrode 3 ... Terminal board 4 ... Battery terminal 5 ... Insulating plate 6 ... Space part 7 ... Lead board 8 ... Protection element 9 ... Electrode Window 10 ... Holder parallel peripheral wall 11 ... Fitting recess 12 ... End rib 13 ... Parallel rib 14 ... Blocking plate part 15 ... Projection part 16 ... Vertical rib 17 ... Notch part 20 ... Case 21 ... Substrate 22 ... Holder 30 ... Case 31 ... Substrate 32 ... Secondary battery 33 ... Battery terminal

Claims (6)

The terminal board (3) that fixes the battery terminal (4), the secondary battery (2) that connects the terminal board (3), the terminal board (3), and the secondary battery (2) A first case (1A) housing a terminal board (3) and a secondary battery (2) inside the peripheral wall with a peripheral wall around the bottom surface, and a peripheral wall of the first case (1A) A battery pack comprising a second case (1B) connected to the opening and closing the opening,
The terminal board (3) is connected to the secondary battery (2) in a posture parallel to the bottom surface of the first case (1A), and away from the bottom surface of the first case (1A). It is arranged along the inner side of the holder parallel peripheral wall (10) that is close to the inner surface and constitutes one side of the peripheral wall of the first case (1A). A plurality of battery terminals (4) are fixed on the surface side facing the inner surface of (1B),
The second case (1B) has an electrode window (9) that exposes the battery terminal (4) fixed to the terminal board (3) to the outside.
The first case (1A) is for mounting the battery pack at a fixed position on the electrical device at a position facing the back side of the terminal board (3), which is the opposite side to which the battery terminal (4) is fixed. The fitting recess (11) is provided so as to protrude from the bottom surface to the inner surface,
The fitting recess (11) has a pair of end ribs (projecting from the bottom surface toward the terminal board (3) in a direction perpendicular to both the holder parallel peripheral wall (10) and the bottom surface of the first case (1A)). 12), parallel ribs (13) provided so as to project from the bottom so as to connect the pair of end ribs (12) in a posture perpendicular to the bottom surface and parallel to the holder parallel peripheral wall (10), and the parallel ribs (13) 13) and a closing plate portion (14) that connects the edge opposite to the bottom surface of the end rib (12), and the end rib (12) and the parallel rib (13) in a posture orthogonal to each other ) And the closing plate portion (14) are integrally formed of plastic for molding the first case (1A), and the fitting recess (11) is provided in the first case (1A). 12), a parallel recess (13), and a fitting recess (11) composed of a closing plate part (14) are projected to the back side of the terminal board (3) to support the terminal board (3) from the back side. Battery pack. The battery pack according to claim 1, wherein a fitting recess (11) is arranged in the vicinity of the back surface of the terminal substrate (3) where the battery terminals (4) are provided. The battery pack according to claim 2, wherein the fitting recess (11) is disposed between the plurality of battery terminals (4). The fitting recess (11) has a protruding portion (15) protruding from the closing plate portion (14) to the terminal board (3), and the protruding portion (15) supports the bottom surface of the terminal board (3). The battery pack according to claim 1. The battery pack according to claim 4, wherein the protrusion (15) is arranged between the battery terminals (4). The battery pack according to claim 1, wherein the +-battery terminals (4) are arranged apart from each other, and the fitting recesses (11) are arranged between the +-battery terminals (4).

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