JP3878411B2 - Battery pack - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a battery pack, and more particularly to a battery pack having a simplified structure.
[0002]
[Prior art]
In recent years, mobile phones have rapidly spread and the types of mobile phones are diverse. Along with this, the battery packs mounted on the mobile phone are variously changed according to the type of the mobile phone, and various types of battery packs having different shapes and arrangement of connection terminals with the mobile phone are produced.
[0003]
A battery pack of this type of first conventional example is shown in FIG. In the figure, reference numeral 20 denotes a battery pack, which is configured by housing a battery cell 22, a battery protection module 23, and a terminal block 24 inside a casing 21.
[0004]
In the battery protection module 23, an electronic component 232 that constitutes a battery protection circuit is mounted on the printed wiring board 231, and the battery cell 22 is connected via cell connection terminals 233a and 233b provided at predetermined positions on the printed wiring board 231. Connected to the positive and negative electrodes. Further, a terminal block 24 is mounted on the printed wiring board 231 of the battery protection module 23, and a plurality of external terminal electrodes 241 provided on the terminal block 24 are externally provided through an opening 211 provided in the casing 21. Exposed.
[0005]
[Problems to be solved by the invention]
However, in the battery pack of the conventional example described above, it is troublesome to fix the position so that the external terminal electrode 241 faces the opening 211, and the fixing work is troublesome.
[0006]
In view of the above problems, an object of the present invention is to provide a battery pack capable of easily fixing an external terminal electrode to an exposed position.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, in a battery pack in which a battery cell and a protection circuit for the battery cell are housed in a casing, the protection circuit is formed on one main surface of the battery pack. A printed wiring board having a terminal electrode connected to the battery cell on the other main surface and an external terminal electrode for connection to the main device on which the component is mounted, and the one main surface of the printed wiring board A battery protection module having a resin layer having a rectangular parallelepiped shape provided with the main surface as one surface and sealing the electronic component and having only a locking groove on the surface; A battery having a protrusion that engages with a locking groove and an opening having a predetermined shape provided corresponding to the external electrode, and the external terminal electrode is exposed to the outside of the casing through the opening. Suggest a pack.
[0008]
According to the battery pack, the cell connection terminal of the battery protection module is connected to the battery cell, and the external terminal electrode of the battery protection module is exposed to the outside of the casing through the opening. Further, the engaging groove provided in the resin layer of the battery protection module and the protrusion provided in the casing are engaged so that the external terminal electrode of the battery protection module faces the opening of the casing. Ru is fixed is aligned to.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Below, an embodiment of the present invention with reference to the accompanying drawings.
[0010]
Figure 1 is an exploded perspective view illustrating a battery pack according to an embodiment of the present invention, FIG. 3 is a perspective view showing a terminal electrode formation surface of the battery protection module according to one embodiment, FIG. 4 is a resin of a battery protection module according to one embodiment perspective view of the layer surface, and FIG. 5 is a perspective view showing a battery protection module in one embodiment.
[0011]
In the figure, reference numeral 10 denotes a battery pack, which includes battery cells 12 and a battery protection module 13 inside casings 11a and 11b.
[0012]
As shown in FIGS. 3 to 5, the battery protection module 13 has electronic components 132a to 132j constituting a battery protection circuit mounted on one main surface of a printed wiring board 131 made of a rectangular ceramic substrate. On the other main surface of the wiring board 131, terminal electrodes 136a136b for connecting battery cells are provided at both ends in the longitudinal direction, and a plurality of external terminal electrodes 136c are provided at the center.
[0013]
Further, the electronic components 132a to 132j provided on the printed wiring board 131 are sealed with resin, and a resin layer 133 is formed with the sealing resin. The resin layer 133 has a rectangular parallelepiped shape having a bottom surface equal to the main surface of the printed wiring board 131, and two locking grooves 137a and 137b extending in the width direction and the longitudinal direction are formed on the top surface. The resin layer 133 is made of, for example, a transparent thermosetting resin or ultraviolet curable resin having insulating properties, waterproof properties, and heat resistance properties. In addition, a resin having chemical resistance, for example, a resin having alkali resistance, acid resistance, and corrosion resistance, such as a resin that prevents chemical change due to leakage of an electrolyte used in a battery, may be used. Further, for example, a resin containing a ferrite filler may be used. The printed wiring board 141 is not limited to a ceramic substrate, and may be a glass epoxy substrate, a paper epoxy substrate, a paper phenol substrate, a flexible substrate, or the like.
[0014]
Further, the metal tabs 14a and 14b are soldered to the terminal electrodes 136a and 136b, respectively, and the external terminal electrode 136c is disposed so as to face and be adjacent to the opening 111 for exposing the external terminal electrode provided in the casing 11a. In this state, strip-shaped metal pieces 15a and 15b are welded to the metal tabs 14a and 14b, respectively, and are electrically connected to the positive electrode terminal and the negative electrode terminal of the battery cell 12 by the metal pieces 15a and 15b.
[0015]
Further, the casing 11b, the locking grooves 137a for positioning and fixing the battery protection module 13, protrusion 112 of Cross shape you engage in 137b is provided.
[0016]
According to the battery pack 10 having the above configuration, when the battery cell 12 and the battery protection module 13 are stored in the casings 11a and 11b, the protrusion 112 is engaged with the locking grooves 137a and 137b of the battery protection module 13. As a result, the battery protection module 13 can be easily positioned and fixed, and the external terminal electrode 136c can be easily opposed to the opening 111 and exposed.
[0017]
In the present embodiment, the above-described battery protection module 13 is manufactured as follows. That is, as shown in FIG. 6, a collective substrate 31 in which printed wiring boards 131 of a plurality of battery protection modules 13 are connected in a matrix is formed (aggregate substrate manufacturing process). Here, the collective substrate 31 in which 12 printed wiring boards 131 are arranged in a 2 × 6 matrix is formed. The collective substrate 31 has a marker region 31a at the peripheral portion thereof, and a mark 31b indicating a cutting position is attached to the marker region 31a. In addition, it may replace with the mark 31 by a display, and may mark by a notch | incision, a recessed part, etc.
[0018]
Next, after mounting the electronic component 132 on the upper surface of the collective substrate 31 (electronic component mounting step), a resin layer 133 is formed on the upper surface side of the collective substrate 31 (resin layer forming step).
[0019]
As shown in FIG. 7, the resin layer 133 is formed by placing the collective substrate 31 on a base 41 on which the collective substrate 31 on which the electronic component 132 is mounted can be placed in a horizontal state, The frame member 42 is fixed so as to overlap the peripheral portion of the marker region 31a so as to hide 31b. Next, the above-described resin 43 is poured into the upper surface side of the collective substrate 31. Next, after the resin 43 is cured, the frame member 42 is removed, and then the collective substrate 31 is removed from the base 41, and the resin layer forming step is completed.
[0020]
Next, locking grooves 137a and 137b are formed on the upper surface of the resin layer 133 using a dicing apparatus or the like (groove forming step). Further, the collective substrate 31 in which the locking grooves 137a and 137b are formed in the resin layer 133 is cut using the dicing device 44. At this time, the dicing device 44 is positioned by determining the cutting position using the mark 31b attached to the marker region 31a of the collective substrate 31 as a mark. Thereby, the collective substrate 31 is cut into a matrix along the boundary line between the individual printed wiring boards 131, and the battery protection module 13 is obtained (separation process). When cutting is performed using the dicing device 44 in this way, the cut surface becomes a very smooth surface, and shaping such as deburring can be performed simultaneously. Furthermore, since the resin layer 133 is waterproof, a wet cutting method can also be used.
[0021]
According to the manufacturing method of the battery protection module 13 described above, the resin layer 133 can be formed in the state of the collective substrate 31 and the collective substrate 31 can be separated and the deburring and the like can be simultaneously performed. In addition, the number of processes is reduced as compared with the case of manufacturing using individual printed wiring boards. Furthermore, when the surface is cut by the dicing device 44, the surface of the battery protection module 13 is smooth, so that the display ink is less likely to permeate and a character display without fading can be formed on the surface of the battery protection module 13. Further, the battery protection module 13 can be protected by the resin layer 133 even when liquid leakage occurs from the battery cell 12 or water enters from the outside.
[0022]
Further, since the resin protection layer 13 is formed in a rectangular parallelepiped shape by providing the resin layer 133, it is possible to easily cope with a packing form corresponding to various parts supply methods such as a tray, taping, or bulk feeder. Furthermore, since the printed wiring board 131 is reinforced by the resin layer 133, the printed wiring board 131 does not bend at the time of inspection.
[0023]
Furthermore, when the battery protection module 13 is inspected, the battery protection module 13 can be easily transported and positioned using the locking grooves 137a and 137b formed in the resin layer 133.
[0024]
Next, a reference example of the present invention will be described.
[0025]
FIG. 8 is an exploded perspective view showing the battery pack in the reference example , and FIG. 9 is a perspective view showing the battery protection module in the reference example . In the figure, the same components as those of the above-described embodiment are denoted by the same reference numerals and the description thereof is omitted. Moreover, differences between the embodiment and the reference example, an external terminal electrode 136c in the implementation form with a battery protection module 13B was replaced with the connector 138, that has a configuration for connecting the main device by a connector 138 There, other configurations are the same as implementation form.
[0026]
That is, in the battery protection module 13B in the reference example , the connector 138 is mounted on one main surface of the printed wiring board 131 together with the electronic components 132a to 132j constituting the protection circuit, and the connector 138 is removed except for the opening 138a of the connector 138. The electronic components 132a to 132j are sealed with the resin layer 133. Further, only the terminal electrodes 136a and 136b for connection to the battery cell 12 are provided on the other main surface of the printed wiring board 131.
[0027]
The connector 138 is for connecting to the main device using the battery pack 10B, and is a socket-type connector having a rectangular parallelepiped shape. The connector 138 includes a plurality of contacts 138b in the opening 138a and is connected to the bottom surface thereof. Terminal (not shown). The connection terminals on the bottom surface are soldered to connection electrodes provided on the main surface of the printed wiring board 131. The connector 138 is mounted so that the opening surface thereof is orthogonal to the main surface of the printed wiring board 131 and the opening surface is positioned on the edge of the printed wiring board 131. Therefore, the opening 138 a of the connector 138 is exposed on the side surface of the resin layer 133.
[0028]
In addition, the resin layer 133 has a rectangular parallelepiped shape having a bottom surface equal to the main surface of the printed wiring board 131, and two locking grooves 137a and 137b extending in the width direction and the longitudinal direction are formed on the top surface. .
[0029]
Further, the metal tabs 14a and 14b are soldered to the terminal electrodes 136a and 136b, respectively, and the opening 138a of the connector 138 is disposed so as to face and adjoin the opening 113 provided on the side surface of the casing 11a. In the state, the strip-shaped metal pieces 15a and 15b are welded to the metal tabs 14a and 14b, respectively, and are electrically connected to the positive electrode terminal and the negative electrode terminal of the battery cell 12 by the metal pieces 15a and 15b.
[0030]
Further, the casing 11b, implementation forms as well as engaging grooves 137a for positioning and fixing the battery protection module 13B, projections 112 of Cross shape you engage in 137b is provided.
[0031]
According to the battery pack 10B having the above configuration, when the battery cell 12 and the battery protection module 13B are stored in the casings 11a and 11b, the protrusion 112 is engaged with the locking grooves 137a and 137b of the battery protection module 13B. Thus, the battery protection module 13B can be easily positioned and fixed, and the contact 138b in the opening 138a of the connector 138 can be easily opposed to the opening 113 and exposed.
[0032]
Method for producing a battery protection module 13B described above is almost the same as the implementation forms, with respect to embedded connectors 138 in the step of forming the resin layer 133 was prepared as described below.
[0033]
That is, as shown in FIGS. 10 and 11, when the electronic component 132 and the connector 138 are mounted on the upper surface of the collective substrate 31, the closing member 138 c is attached so as to close the opening 138 a of the connector 138. This is to prevent the resin from being filled in the opening 138a when the resin layer 133 is formed later. Further, the closing member 138c is a plate or film that is affixed to the edge of the opening surface of the connector 138. The thickness of the closing member 138c is that of the blade of the dicing apparatus used in the separation step as shown in FIG. It is preferable to set the thickness D2 or less. In this way, by setting the thickness of the closing member 138c, the closing member 138c can be removed when cutting with the dicing apparatus.
[0034]
Note that implementation embodiment described above will not be the present invention only one embodiment of the present invention be limited only to these embodiments. For example, as a battery pack 10C of another reference example shown in FIG. 12, may be exposed through the opening 114 provided with a connector 138 in the reference example to the surface of the same casing 11a and implementation forms. In this case, if the battery protection module 13B is rotated and mounted in the casing 11a and a protrusion equivalent to the protrusion 112 is provided on the inner surface of the casing 11a, the opening of the connector 138 is opposed to the opening 114. Can be fixed.
[0035]
【The invention's effect】
As described above, according to the battery pack of the first aspect of the present invention, the engagement groove provided in the resin layer of the battery protection module engages with the protrusion provided in the casing, so that the battery protection module is engaged. Therefore, the external terminal electrode provided on the printed wiring board of the battery protection module can be positioned to face the opening of the casing, and the external terminal is exposed to the outside through the opening. it is Ru can.
[Brief description of the drawings]
[1] terminal electrodes formed of a battery protection module according to one embodiment of the exploded perspective view of a battery pack 2 is an exploded perspective view showing the battery pack in the prior art [3] The present invention in one embodiment of the present invention perspective view of a battery protection module in an embodiment of a perspective view and FIG. 5 the invention showing a resin layer surface of the battery protection module in an embodiment of a perspective view of a surface [4] the present invention 6 the Process drawing explaining the manufacturing method of the battery protection module in one Embodiment of this invention [FIG. 7] The figure explaining the resin layer formation process in one Embodiment of this invention [FIG. 8] The battery pack in the reference example of this invention is shown. Figure 11 illustrating a manufacturing method of a battery protection module in reference example of an exploded perspective view perspective view of a battery protection module in reference example of the present invention; FIG 10 shows the present invention Exploded perspective view illustrating a battery pack according to another reference example of FIG. 12 shows the present invention for explaining a method for manufacturing a battery protection module in reference example of the invention [Description of symbols]
DESCRIPTION OF SYMBOLS 10, 10B, 10C ... Battery pack, 11a, 11b ... Casing, 111, 113, 114 ... Opening part, 112, 115 ... Projection, 12 ... Battery cell, 13, 13BD ... Battery protection module, 131 ... Printed wiring board, 132a-132j ... Electronic component 133 ... Resin layer, 136a, 136b ... Terminal electrode for battery cell connection, 136c ... External terminal electrode, 14a, 14b ... Metal tab, 15a, 15b ... Metal piece, 31 ... Collective substrate, 31a ... Marker region, 31b ... Mark 41 ... Base, 42 ... Frame member, 43 ... Resin, 44 ... Dicing machine.

Claims (1)

In a battery pack in which a battery cell and a protection circuit for the battery cell are housed in a casing,
A printed wiring board having electronic components forming the protection circuit mounted on one main surface and having terminal electrodes connected to the battery cells on the other main surface and external terminal electrodes for connection to the main device And a resin layer having a rectangular parallelepiped shape provided on the one main surface of the printed wiring board with the main surface as one surface, sealing the electronic component and having only a locking groove on the surface. A battery protection module having
The casing includes a protrusion that engages with the locking groove and an opening having a predetermined shape provided corresponding to the external electrode, and the external terminal electrode is disposed outside the casing through the opening. A battery pack characterized by being exposed.

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