JP3221870B2 - Secondary battery with battery protection circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a secondary battery, such as a lithium ion secondary battery, which is provided with a battery protection circuit and has a function of protecting the battery itself from overcharging and overdischarging. The present invention relates to a secondary battery including a battery protection circuit adapted to be applied to a small and flat secondary battery.

[0002]

2. Description of the Related Art Secondary batteries are used to prevent battery damage due to abnormal use such as short-circuiting of battery peripheral circuits, short-circuiting between positive and negative electrodes, and overcharging and overdischarging of equipment using the secondary batteries. Protection function is provided. These include PTC elements that prevent excessive discharge current due to short circuits, etc., and current cutoff valves that release the internal pressure by interrupting the current-carrying circuit due to an abnormal rise in battery internal pressure due to overcharging. It is a well-known function to be equipped. In addition, a lithium ion secondary battery is provided with a battery protection circuit to prevent overcharging, overdischarging, and the like, and this battery protection circuit generally has a battery protection circuit in the form of a battery pack together with the lithium ion secondary battery. The formed circuit board is housed in a pack case and integrated. It is well-known that such a battery pack in which a secondary battery and a battery protection circuit are housed and integrated in a pack case is often used as a battery power supply device of a portable device such as a mobile phone or a portable computer. By the way.

[0003] The battery protection circuit can have functions of preventing overcharge and overdischarge, shutting off excessive current, monitoring the battery temperature, and the like, and can be integrated with the secondary battery itself. If possible, a secondary battery having a battery protection circuit can be formed without forming a battery pack, and a highly versatile secondary battery can be provided. As a secondary battery in which a protection circuit is integrated with a secondary battery, those disclosed in JP-A-8-31460, JP-A-11-26029 and the like are known.

[0004]

However, when a battery protection circuit is integrated with a secondary battery, it is a problem to configure the secondary battery without impairing the form of the secondary battery and suppressing an increase in external dimensions. In particular, in the case of a small flat secondary battery, in order to integrate the battery protection circuit into the battery, it is difficult to integrate the battery protection circuit while suppressing the increase in external dimensions due to a small arrangement space.

[0005] In addition, in the case of a small flat secondary battery, there is little space for providing the above-mentioned PTC element and the current cutoff valve, and when these are provided, there is a problem that the battery capacity is reduced due to a decrease in the number of power generation elements. Is provided outside the secondary battery as part of the battery protection circuit, and the function of the current cutoff valve must be delegated to the battery protection circuit. However, when the PTC element is provided as a part of the battery protection circuit, an increase in volume when the battery protection circuit is integrated with the secondary battery is unavoidable, and it is difficult to achieve the purpose of suppressing an increase in external dimensions. Further, in a normal battery protection circuit, the valve body is broken by a battery internal pressure accompanying gas generated in an overcharge region exceeding an overcharge protection voltage set in the circuit, and functions as a current cutoff valve that cuts off current. I couldn't do that.

An object of the present invention is to provide a compact structure applicable to a flat type secondary battery so as to suppress an increase in the external dimensions of the secondary battery, and to improve the function of a battery protection circuit to provide a PTC element and a current supply. It is an object of the present invention to provide a battery provided with a battery protection circuit that enables battery protection by a circuit configuration without providing a shut-off valve, and that does not require a battery pack and can be used alone.

[0007]

Means for Solving the Problems A first invention of the present application for achieving the above object is a battery can in which a power generating element is housed in a bottomed cylindrical container, and a closure for closing an open end of the battery can. A battery protection circuit that protects the secondary battery from overcharge, overdischarge, etc., to a secondary battery in which a positive electrode or a negative electrode is respectively set to a protruding terminal provided insulated from the battery can at the center of the part. Is a secondary battery provided with a battery protection circuit integrally provided, wherein a circuit board on which the battery protection circuit and a plurality of input / output terminals are formed is disposed on a sealing portion side of a battery can, and the protrusion is provided. A terminal and a battery can are respectively connected to the input / output terminal via a battery protection circuit, and the battery can is sealed.
In addition, an opening is formed in the input / output terminal part formed on the circuit board.
To cover the circuit board and to the bottom of the battery can
A connecting portion is formed at the tip of a pair of extending portions extending
Place the insulated holder on the bottom of the battery can.
And a pair of
Place a lower insulating holder with a connecting part at the end of the extension.
The upper insulating holder and the lower insulating holder
Connect the connecting parts, and connect the upper insulating holder and lower insulating holder.
The side peripheral surface of the secondary battery including the side peripheral portion of the secondary battery is covered with an insulating sheet.

According to the first aspect, the positive and negative electrodes of the secondary battery are connected to the plurality of input / output terminals formed on the circuit board via the battery protection circuit, and the periphery thereof is at a position corresponding to the input / output terminals. It is insulated and covered by an upper insulating holder provided with an opening, a lower insulating holder, and an insulating sheet. A secondary battery provided with a battery protection circuit can be configured without impairing the form of the secondary battery simply by providing a space on the sealing portion of the secondary battery on which the circuit board can be disposed.

In a second aspect of the present invention, a battery can in which a power generating element is housed in a bottomed cylindrical container, and the battery can is insulated at the center of a sealing portion for sealing an open end of the battery can. A secondary battery in which a protruding terminal provided and a positive electrode or a negative electrode are respectively set, and a battery protection circuit for protecting the secondary battery from overcharge, overdischarge, etc., is provided integrally. A connection board joined to the protruding terminal, a circuit board on which a battery protection circuit is formed and a plurality of input / output terminals are formed, and a seating surface of the circuit board. And a spacer for separating the secondary battery from the secondary battery, and connecting the lead plate and the connection plate joined to the battery can to predetermined positions on the circuit board, respectively. The secondary battery and the circuit board are integrated, and the secondary battery and The battery protection circuit is electrically connected, the positive and negative electrodes of the secondary battery are connected to the input / output terminals via the battery protection circuit, and the input / output terminals formed on the circuit board at the sealing side of the battery can. An upper insulating holder having a connecting portion formed at the tip of a pair of extending portions that forms an opening in the portion and covers the circuit board and extends toward the bottom side of the battery can is provided. A lower insulating holder having a connecting portion formed at the tip of a pair of extending portions that covers the bottom surface of the battery can and extends toward the sealing portion side of the battery can. It is characterized in that the holder is connected between the respective connecting portions, and the side peripheral surface of the secondary battery including the side peripheral portions of the upper insulating holder and the lower insulating holder is covered with an insulating sheet.

According to the above configuration, the circuit board is disposed on the secondary battery via the spacer, and the secondary battery is connected to the battery protection circuit formed on the circuit board by the connection plate and the lead plate. The secondary battery is formed in the secondary battery with the battery protection circuit connected to the input / output terminal formed on the circuit board through the battery protection circuit. By covering the entire area except the input / output terminals with the upper insulating holder, lower insulating holder, and insulating sheet, the secondary battery is compact with a battery protection circuit that exposes only the input / output terminals to the outside. Is done.

In the above configuration, the secondary battery is preferably applied to a battery having a flat shape with an oblong cross section, and can be applied as a battery power source for a portable device which is intended to be small and thin.

Further, the electronic components mounted on the sealing portion side of the circuit board are arranged at positions corresponding to the concave portions formed on the sealing portion of the secondary battery, so that the amount of protrusion from the secondary battery is reduced. Thus, a battery protection circuit can be provided.

Further, by forming the positioning portion for the secondary battery and the opening at a position corresponding to the electronic component mounted on the circuit board in the spacer, positioning at the time of mounting on the secondary battery can be achieved. The battery protection circuit can be accommodated in a small space by housing the electronic component mounted on the sealing portion side of the circuit board in the opening.

By forming the positioning portion on a positioning projection disposed in parallel with both sides of the protruding terminal, the insulation between the battery can and the connection plate can be strengthened simultaneously with the positioning.

Further, by arranging the plurality of input / output terminals provided on the circuit board asymmetrically, reverse loading can be prevented.

Further, by forming a step for covering the insulating sheet on the side peripheral portion of the upper insulating holder, positioning at the time of attaching the insulating sheet is performed.

Further, by forming a covering portion on the upper insulating holder and the lower insulating holder so as to cover the short side and a part of the long side of the flat secondary battery, the secondary battery and the battery are protected. The circuit can be integrated reliably, and the upper and lower insulating holders do not cover the entire secondary battery, so even when the battery can swells due to repeated charging and discharging, the outer diameter changes. Do not let.

Further, when the upper insulating holder and the lower insulating holder are connected by overlapping and / or engaging the respective connecting portions, the connection is reliably performed.

The lead plate has one end joined to the bottom surface of the battery can and extends along the short side surface of the flat battery can toward the sealing portion, thereby reducing the thickness of the flat secondary battery. Not increase.

Further, by forming a concave portion or an open portion for accommodating the lead plate on the inner surface side of the upper insulating holder and the lower insulating holder, it is possible to suppress the position holding of the lead plate and an increase in the width size.

The battery protection circuit includes a main control circuit that detects a state such as overcharge or overdischarge and shuts off the charge / discharge circuit.
A double protection circuit including a sub-control circuit that shuts off the charge / discharge circuit when the main control circuit is abnormal is formed, and the circuit pattern on the circuit board is separated from the ground portion of each of the main and sub-control circuits. The pair of lead plates, one end of which is joined to the battery can, are connected to the ground portions of the main control circuit and the sub control circuit, respectively, and are not directly connected between them, so that a closed loop is formed in the ground circuit. Instead, the effect of noise due to the closed loop can be reduced.

[0022]

Embodiments of the present invention will be described below with reference to the accompanying drawings to provide an understanding of the present invention.
The embodiment described below is an example embodying the present invention, and does not limit the technical scope of the present invention.

In the embodiment described below, a flat lithium ion secondary battery as shown in FIG. 3 is integrated with a circuit board constituting a battery protection circuit for protecting the secondary battery from overcharge, overdischarge, and the like. As shown in FIG. 1, the secondary battery is provided with a battery protection circuit without damaging the form of the secondary battery.

In FIG. 1, a secondary battery provided with a battery protection circuit according to the present embodiment has a plus terminal 4 on one end surface thereof.
Exposing the minus terminal 5 and the temperature detection terminal 6 to the outside,
The secondary battery 1 and a circuit board 9 that constitutes a battery protection circuit are integrated into a single unit, while all parts other than the terminal portions are covered with an upper insulating holder 13, a lower insulating holder 14, and an insulating label 7.

FIG. 2 is an exploded view showing the internal structure of the secondary battery 1. A positive electrode input / output terminal (protruding terminal) of the secondary battery 1 A) a connection plate 11 joined to 25), a spacer 12 provided on the secondary battery 1 to provide a seating surface for the circuit board 9,
A circuit board 9, which constitutes a battery protection circuit and has a positive terminal 4, a negative terminal 5, and a temperature detecting terminal 6 formed thereon, and an upper insulating holder 13 that insulates and covers the upper side, are provided on the bottom side of the secondary battery 1. A base 10 b is joined to the bottom surface of the secondary battery 1, and a pair of lead plates 10, 10 that extend the lead 10 a to the sealing portion side and a lower insulating holder 14 that insulates the lower side are provided.

As shown in FIG. 3, the secondary battery 1 includes a power generating element 3 in a battery can 31 formed in a bottomed cylindrical shape having an oval cross section.
3 and a sealing portion provided with a gasket 35, a sealing plate 32, and an electrode cap 34 at the open end of the battery can 31.
A small-sized, closed end of the battery can 31 by fixing the sealing portion by caulking to bend the opening end inward.
It is formed in a flat shape. The positive electrode plate constituting the power generating element 33 is connected to an electrode cap 34 insulated from the battery can 31 by a gasket 35, and the central protrusion serves as the positive electrode input / output terminal 25 of the secondary battery 1. The power generation element 33
Is connected to the battery can 31 and the battery can 3
Reference numeral 1 denotes a negative electrode input / output terminal of the secondary battery 1.

The positive electrode input / output terminal 25 of the secondary battery 1
The base 11b of the connection plate 11 formed in an L shape is joined. A pair of lead plates 1 is provided on the bottom surface of the battery can 31.
The base portions 10b of the 0 and 10 are joined, and the pair of lead portions 10a and 10a extend toward the sealing portion along the side surface of the battery can 31.

Further, a spacer 12 formed as shown in FIG. 4 is attached to the sealing portion side of the secondary battery 1.
As shown in FIG. 4B, on the lower surface (the secondary battery 1 side) of the spacer 12, a positive electrode input / output terminal 25 formed in an oval shape is provided.
A pair of positioning portions 37 are formed in contact with the side surfaces in the longitudinal direction, and are arranged on the sealing portion so as to be fitted to the positive electrode input / output terminals 25, whereby the spacer 12 is positioned on the secondary battery 1. The insulation between the battery can 31 and the negative electrode is strengthened.

The connection plate through hole 38 opening between the pair of positioning portions 37 allows the lead portion 11a of the connection plate 11 joined to the positive electrode input / output terminal 25 to penetrate the upper surface. The spacer 12 forms a seat surface insulated from the secondary battery 1, and the seat surface has openings 36 a and 36 b for housing electronic components mounted on the sealing portion side of the circuit board 9. When the circuit board 9 is disposed thereon, the electronic components mounted on the sealing portion side are accommodated in the openings 36a and 36b.
The thickness is added to the secondary battery 1 only at the height obtained by adding the thickness of the battery, and the increase in height due to the provision of the battery protection circuit is suppressed.

FIG. 5 is a perspective view showing circuit patterns formed on both front and back surfaces of the circuit board 9 and electronic components mounted thereon. The battery protection circuit shown in FIG. And an output terminal. As shown in FIG.
On the back side (b) of the circuit board 9, IC components 21 and 22 are provided.
A battery protection circuit on which the chip component 26 is mounted is formed. On the front side (a), the plus terminal 4, the minus terminal 5, the temperature detection terminal 6, and the connection plate conductor pattern 15 for connecting the connection plate 11. And lead plate conductor patterns 16a and 16b for connecting the lead plate 10. The circuit patterns formed on both sides are connected by through holes 30 at important points. The lead portion 11a of the connection plate 11 is passed through the lead through hole 20 formed in the circuit board 9, and the lead portion 11a is bent onto the connection plate conductor pattern 15 and soldered. Further, the lead portions 10a, 10a of the pair of lead plates 10 are respectively inserted into the lead plate passing recesses 29, 29 formed at both ends of the circuit board 9.
To bend and solder on the lead plate conductor patterns 16a and 16b. The circuit board 9 is fixed on the spacer 12 by soldering the connection plate 11 and the lead plate 10.

The battery protection circuit shown in FIG. 6 is a main control circuit IC for protecting the secondary battery 1 from overcharge, overdischarge and overcurrent.
When a voltage in an overcharge, overdischarge and overcurrent state is detected, the switching element incorporated in the IC is controlled to an off state, and is turned off until a predetermined release voltage is detected by a hysteresis operation. The state is maintained, and the input / output circuit of the secondary battery 1 is shut off to prevent the secondary battery 1 from being overcharged, overdischarged, and overcurrent. Further, control is performed such that energization is enabled in the discharging direction when the input / output circuit is interrupted due to overcharging, and energization is enabled in the charging direction when the input / output circuit is interrupted due to overdischarging. In addition to the main control circuit IC22, a sub-control circuit IC21 for protecting the secondary battery 1 from overcharge is provided. The sub-control circuit IC21 normally controls the switching element incorporated in the IC to be in an on state to keep the input / output circuit in a conductive state, and when the operation of preventing overcharge is not performed due to an abnormal operation of the main control circuit IC22. ,
The progress of the overcharge state is detected, the switching element is controlled to the off state, the input / output circuit is cut off, the off state is maintained until a predetermined release voltage is detected by the hysteresis operation, and the secondary battery 1 is overcharged. To prevent damage due to the progress of the work. With this configuration, the secondary battery 1 is doubly protected from overcharge. In particular, the secondary battery 1 that is significantly damaged by overcharge can be protected by the battery protection circuit. Therefore, a current cutoff valve or a PTC (Pos) conventionally provided in the battery to protect the battery.
active Temperature Coeffic
i) can be eliminated, which is a suitable means in the case of the small and thin secondary battery 1 applied to the present embodiment. In other words, it is difficult to obtain a space for providing a current cutoff valve and a PTC in a small or thin battery, and by providing these, the volume of the positive and negative electrodes serving as power generation elements is reduced, and the battery performance is reduced due to a reduction in battery capacity. The problem of being unable to obtain is eliminated. Also, PT
If C is configured as a part of the battery protection circuit, the space occupied by the battery protection circuit increases, which hinders miniaturization. However, the battery protection circuit of this configuration can configure a battery protection circuit without PTC.

The circuit board 9 on which the battery protection circuit is formed
In the above, the conductor pattern 16a for the lead plate to which one of the pair of lead plates 10
As shown in FIG. 5B, the main ground pattern 19 connected through the through hole 30 and the sub ground pattern 18 connected through the through hole 30 from the lead plate conductor pattern 16b to which the other lead plate 10 is connected. Not directly connected. With the configuration of this circuit pattern, the battery can 3
The formation of a closed circuit in which the pair of lead plates 10 each having the base 10b joined to the base 1 by a conductor pattern on the circuit board 9 is avoided. Although the formation of a closed circuit is easily affected by noise or the like from the applied device, a malfunction due to noise or the like can be prevented by the configuration in which the closed circuit is not formed.

As shown in FIG. 5A, the plus terminal 4 is formed on the plus terminal conductor pattern 4a formed on the front side of the circuit board 9, and the minus terminal 5 is formed on the minus terminal conductor pattern 5a. The temperature detection terminal 6 is joined onto the detection terminal conductor pattern 6a. By using a copper-nickel alloy plate or a clad material of the copper-nickel alloy and stainless steel, these terminals are excellent in conductivity, bonding property, and corrosion resistance. Also, each conductor pattern can be plated with gold and used as a terminal without joining a plate material as a terminal.

After attaching the circuit board 9 to the secondary battery 1 as described above, as shown in FIG. 2, the upper insulating holder 13 is provided on the circuit board 9 and the lower insulating holder 13 is provided on the bottom of the secondary battery 1. 14 are arranged, and the entire peripheral surface including the periphery of the upper insulating plate 13 and the lower insulating holder 14 is covered with an insulating label 7 to complete a secondary battery having a battery protection circuit having a form as shown in FIG. Is done.

As shown in FIG. 2, the upper insulating holder 13 has a plus terminal window 4c at a position corresponding to the plus terminal 4 provided on the circuit board 9, a minus terminal window 5c at a position corresponding to the minus terminal 5, and Temperature detection terminal windows 6c are respectively opened at positions corresponding to the temperature detection terminals 6, and step portions 43 for positioning the edges of the insulating label 7 are formed around the temperature detection terminal windows 6c. As shown in FIG. 2, a lead groove 41 for accommodating the lead plate 10 is formed in the upper insulating holder 13 and the lower insulating holder 14, as shown in FIG.

As shown in FIGS. 7 and 8, the positions of the upper insulating holder 13 and the lower insulating holder 14 corresponding to the lead plate 10 are opened, and the extension of the upper insulating holder 13 and the lower insulating holder 14 is performed. By forming the protrusions 13a and 14a into two parts, the width of the upper insulating holder 13 and the lower insulating holder 14 can be reduced, and the size can be reduced. Further, when connecting portions 13b and 14b that fit each other are provided at the tip portions where the extending portions 13a and 14a abut, the connection between the upper insulating holder 13 and the lower insulating holder 14 is ensured. Further, when the connecting portions 13b and 14b are provided with a convex portion 48 and an opening portion 49 which are fitted to each other, and the upper insulating holder 13 and the lower insulating holder 14 are configured to be engaged with each other,
The connection between the upper insulating holder 13 and the lower insulating holder 14 is more reliable.

As shown in FIG. 2, the upper insulating holder 13 and the lower insulating holder 14 are provided with a covering portion 44 for covering the upper and lower portions of the long side surface of the secondary battery 1 so as to fit into the secondary battery 1. The connection is assured, and the winding of the insulating label 7 is facilitated. The formation of the covering portion 44 can be provided also in the configuration shown in FIGS. 7 and 8 and does not cover the entire side surface of the secondary battery 1, so that room for expansion is secured in the battery can 31 and expansion occurs. Also, the change in the overall thickness is suppressed. The secondary battery 1 generates gas due to repeated charge / discharge or is left at a high temperature in a fully charged state, and the mechanically weak battery can 31
The central portion of the secondary battery 1 tends to swell, but the swelling is absorbed within the thickness of the covering portion 44, so that the influence of the thickness change of the secondary battery 1 can be avoided.

After the upper insulating holder 13 and the lower insulating holder 14 are attached as described above, the upper insulating holder 1
The insulating label 7 is attached to the side peripheral surface below the step portion 43 of No. 3. The insulating label 7 is formed by applying a pressure-sensitive adhesive to a heat-shrinkable sheet. The insulating label 7 is adhered to each constituent member and, at the same time, is coated and integrated by heat shrinkage. Since the insulating label 7 can be subjected to design printing on its surface, it can be used as an exterior body having a beautiful appearance, and can display instructions for use and notes.

As shown in FIG. 1, the secondary battery provided with the battery protection circuit configured as described above is provided with the battery protection circuit only by slightly extending the height of the secondary battery 1,
When set in a device in this state, the device itself has a battery protection function and becomes a highly reliable battery power source. In addition, a plus terminal 4, a minus terminal 5, and a temperature detection terminal 6
Since the are arranged asymmetrically in the left and right direction, reverse loading of the device can be prevented.

The flat secondary battery 1 is mainly used for a battery power source of a small portable electronic device, and an increase in thickness impairs the advantages of the flat secondary battery. A battery protection circuit can be provided without increasing the thickness of the battery, and a secondary battery with a battery protection circuit that is smaller and lighter than a battery pack is configured. , Which contributes to weight reduction.

Further, the secondary battery 1 applied to the present embodiment
Shows an example of a lithium ion secondary battery having a positive electrode input / output terminal 25 in the sealing portion and a battery can 31 as a negative electrode input / output terminal, but a secondary battery in which a negative electrode is set in the sealing portion and a positive electrode is set in the battery can side. Needless to say, a battery can be similarly implemented by changing the connection.

[0042]

As described above, according to the present invention, since the battery protection circuit is integrally formed with the secondary battery, it can be used as if only the battery is loaded in the device without providing a battery pack. This can contribute to miniaturization and weight reduction of equipment using a secondary battery as a power supply. In addition, by improving the function of the battery protection circuit, the secondary battery can be protected from overcharge, overdischarge, overcurrent, etc. without providing a PTC element or a current cutoff valve, and can be reliably used without reducing the capacity of the secondary battery. A highly reliable battery protection function can be configured compactly.

[Brief description of the drawings]

FIG. 1 is an external view of a secondary battery with a battery protection device according to an embodiment.

FIG. 2 is a perspective view showing an assembled structure by disassembling each component.

FIGS. 3A and 3B show a configuration of a secondary battery; FIG.
Is a sectional view.

FIGS. 4A and 4B show the structure of a spacer, FIG.
Is a plan view of the lower surface side, and (c) is a cross-sectional view taken along line AA.

FIGS. 5A and 5B show the configuration of the circuit board, FIG.
Is a plan view of the back side.

FIG. 6 is a circuit diagram showing an electrical configuration of a secondary battery including a battery protection circuit.

7A is a top view, FIG. 7B is a front view, FIG. 7C is a left side view, FIG. 7D is a right side view, and FIG. 7E is a bottom view showing another embodiment of the upper insulating holder.

8 (a) is a top view, FIG. 8 (b) is a front view, FIG. 8 (c) is a left side view, FIG. 8 (d) is a right side view, and FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Secondary battery 4 Positive terminal 5 Negative terminal 6 Temperature detection terminal 7 Insulation label 9 Circuit board 10 Lead plate 11 Connection plate 12 Spacer 13 Upper insulating holder 14 Lower insulating holder 25 Positive input / output terminal (protruding terminal) 31 Battery can 33 Power generation Element 37 Positioning part 43 Step part 44 Cover part

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI // H01M 10/40 H01M 10/40 Z (72) Inventor Takeshi Ishimaru 1006 Kazuma Kazuma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. (72) Inventor Masaru Kawabe 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Katsuyuki Shirasawa 1006 Kadoma Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. (56) JP-A-8-31460 (JP, A) JP-A-11-187578 (JP, A) JP-A-7-201358 (JP, A) JP-A-9-320643 (JP, A) (58) (Int.Cl. ⁷ , DB name) H01M 2/30-2/34 H01M 2/02-2/08 H01M 10/40-10/48

Claims (14)

(57) [Claims] 1. A battery can in which a power generating element is accommodated in a bottomed cylindrical container, and a protruding terminal provided insulated from the battery can at the center of a sealing portion for sealing an open end of the battery can. A secondary battery having a battery protection circuit in which a positive electrode or a negative electrode is set, and a battery protection circuit for protecting the secondary battery from overcharging, overdischarging, etc. are integrally provided. A circuit board on which the battery protection circuit and a plurality of input / output terminals are formed is disposed on the side of the sealing portion of the battery can, and the projecting terminal and the battery can are respectively connected to the input / output terminals via the battery protection circuit. Connected, the input / output terminal formed on the circuit board, on the side of the sealed part of the battery can
An opening is formed in the child part to cover the circuit board and the battery
Connected to the tip of a pair of extensions that extend toward the bottom of the can
Place the upper insulating holder with the part formed, and place it on the bottom side of the battery can.
Cover the bottom of the battery can and
The connecting part is formed at the tip of a pair of extending parts
The upper insulating holder and the lower insulating holder.
The secondary connection including the side peripheral parts of the upper insulating holder and the lower insulating holder
A secondary battery provided with a battery protection circuit, wherein a side peripheral surface of the battery is covered with an insulating sheet. 2. A battery can containing a power generating element in a bottomed cylindrical container, and a protruding terminal provided at the center of a sealing portion for sealing an open end of the battery can and insulated from the battery can. A secondary battery having a battery protection circuit in which a positive electrode or a negative electrode is set, and a battery protection circuit for protecting the secondary battery from overcharging, overdischarging, etc. are integrally provided. A connecting plate joined to the protruding terminal, a circuit board on which a battery protection circuit is formed and a plurality of input / output terminals are formed, and a seat surface of the circuit board, A spacer formed and spaced from the secondary battery is provided, and the lead plate and the connection plate joined to the battery can are connected to predetermined positions of the circuit board, respectively.
While the secondary battery and the circuit board are integrated, the secondary battery and the battery protection circuit are electrically connected, the positive electrode and the negative electrode of the secondary battery are connected to the input / output terminal via the battery protection circuit, An opening is formed in the input / output terminal portion formed on the circuit board on the sealing side of the battery can to cover the circuit board, and a pair of extending ends extending toward the bottom side of the battery can. An upper insulating holder having a connecting portion formed thereon is disposed on the bottom side of the battery can. The connecting portion covers the bottom surface of the battery can and extends to the sealing portion side of the battery can. Is formed, and the upper insulating holder and the lower insulating holder are connected between the respective connecting portions. The side peripheral surface of the secondary battery including the side peripheral portions of the upper insulating holder and the lower insulating holder is removed. Battery protection circuit characterized by being covered with an insulating sheet Secondary battery with a. 3. The secondary battery provided with a battery protection circuit according to claim 1, wherein the secondary battery is formed in a flat shape with an oblong cross section, and the protruding terminal is formed in an oblong shape. 4. The battery protection according to claim 1, wherein the electronic component mounted on the sealing portion side of the circuit board is arranged at a position corresponding to the concave portion formed on the sealing portion. Secondary battery with circuit. 5. A spacer, a positioning unit for secondary battery and a circuit board, an opening is formed at a position corresponding to the electronic components mounted on a circuit board according to claim 2, wherein <br/> of A secondary battery with a battery protection circuit. 6. The positioning projection for the secondary battery is a positioning projection disposed in parallel with the longitudinal direction of the protruding terminal.
A secondary battery comprising the battery protection circuit according to claim 5 . 7. A secondary battery provided with a battery protection circuit according to claim 1, wherein a plurality of input / output terminals provided on a circuit board are arranged asymmetrically. 8. A step for determining a covering position of the insulating sheet is formed on a side peripheral portion of the upper insulating holder.
A secondary battery comprising the battery protection circuit according to any one of the preceding claims. 9. An upper insulating holder and a lower insulating holder,
9. The flat battery according to claim 1 , wherein a cover is formed to cover the short side and a part of the long side of the secondary battery.
A secondary battery comprising the battery protection circuit according to any one of the preceding claims. 10. upper insulating holder and the lower insulating holder, equipped with a battery protection circuit according to claim 8 any one coupled by causing the respective connecting portions polymerization and / or engaged two Next battery. 11. The battery protection circuit according to claim 2 , wherein one end of the lead plate is joined to the bottom surface of the battery can, and the lead plate extends to the sealing portion along the short side surface of the flat battery can. Rechargeable battery. 12. A secondary battery having a battery protection circuit according to claim 11, wherein a concave portion or an open portion for accommodating a lead plate is formed in an extension of the upper insulating holder and the lower insulating holder. 13. A secondary battery provided with the battery protection circuit according to claim 1, wherein the circuit board is formed to have the same sectional size or smaller than the sectional size of the secondary battery. 14. A battery control circuit comprising: a main control circuit for detecting a state such as overcharge or overdischarge and shutting off the charge / discharge circuit; and a sub-control circuit for shutting down the charge / discharge circuit when the main control circuit is abnormal. A secondary battery comprising a battery protection circuit according to claim 1 or 2, wherein a double protection circuit comprising: a main protection circuit and a control circuit;