JP2001035544A - Secondary battery with battery protection circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery having a battery protection circuit, wherein the battery protection circuit protecting a secondary battery from overcharging or overdischarging is integrated with the secondary battery. SOLUTION: A spacer 12 and a circuit board 9 are arranged on a secondary battery 1, the positive input output terminal of the secondary battery 1 is connected with the circuit board 9, and a lead board 10 bonded to the bottom of the secondary battery 1 is attached to the circuit board 9. On the circuit board 9 a battery protection circuit is formed, and the secondary battery 1 is connected with positive and negative terminals 4, 5 formed on the circuit board 9 via the battery protecting circuit. With the terminals on the circuit board exposed to an upper insulation plate 13 being placed, and a lower insulation plate 14 being placed at the bottom of the secondary battery 1, the periphery of the insulation plates 13, 14 and all side peripheries are covered with an insulation label 7, so as to constitute a secondary battery integrated with a battery protection circuit.

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 mobile computer. is there.

[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. In addition, in a normal battery protection circuit, in order to perform the function of a current cutoff valve, its reliability is poor, and it is difficult to obtain reliability for reliably protecting a secondary battery.

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 overcharging, overdischarging, etc. is integrated with a secondary battery that has a positive electrode or a negative electrode set on a protruding terminal provided insulated from the battery can on the unit. A secondary battery provided with a battery protection circuit provided in an integrated manner, wherein a connection plate joined to the protruding terminal and a battery protection circuit are formed and a plurality of input / output terminals are provided on the sealing portion side of the battery can. The formed circuit board and the spacer that forms the seating surface of the circuit board and separates the secondary battery from each other are disposed, and the lead plate and the connection plate joined to the battery can are provided. By connecting each to the predetermined position of the circuit board, the secondary power And a circuit board are integrated, a secondary battery and a battery protection circuit are electrically connected, and a positive electrode and / or a negative electrode of the secondary battery is connected to the input / output terminal via a battery protection circuit, and the circuit board An upper insulating plate having an opening formed in the input / output terminal portion is disposed thereon, a lower insulating plate is disposed on the bottom surface of the battery can, and all side peripheral surfaces from the peripheral edge of the upper insulating plate and the lower insulating plate. It is characterized by being constituted by covering with an insulating sheet.

According to the above configuration, the circuit board is arranged 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. This is the upper insulating plate,
By insulatingly covering all parts except the input / output terminals with the lower insulating plate and the insulating sheet, a secondary battery having a battery protection circuit in which only the input / output terminals are exposed to the outside is compactly configured.

A second invention of the present application provides a battery can in which a power generating element is housed in a cylindrical container having a bottom, and a battery can provided on a sealing portion for sealing an open end of the battery can. The battery protection device is formed by integrally attaching a battery protection device that protects the secondary battery from overcharge, overdischarge, etc., to a secondary battery in which the positive terminal or the negative electrode of the battery is set to the protruding terminal. A battery comprising: a connection 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; A spacer that forms a seating surface of the board and that separates the battery can from the battery can 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. By this, the secondary battery and the circuit board are integrated A secondary battery and a battery protection circuit are electrically connected, and a positive electrode and / or a negative electrode of the secondary battery are connected to the input / output terminal via a battery protection circuit to form a secondary battery with a battery protection circuit. A secondary battery with a battery protection circuit is accommodated in a pack case having an opening formed at a position corresponding to an input / output terminal.

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 housing this in a case having an opening at a position corresponding to the input / output terminal, a secondary battery having a battery protection circuit in which only the input / output terminal is exposed to the outside is compactly configured.

In the above configuration, the connection board and the lead board are connected to the circuit board by a pair of leads, respectively, so that the circuit board is securely held on the secondary battery.

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

Further, as the input / output terminals, the terminal conductor patterns formed on the circuit board can be used as they are.

Further, the input / output terminals can be formed by joining a metal plate to a terminal conductor pattern formed on a circuit board.

Further, the spacer is positioned on the secondary battery by forming the positioning portion for the secondary battery, the accommodating portion for the electronic component mounted on the circuit board, and the gas vent hole in the spacer. The resulting circuit board is in a state where the thickness of the electronic component is absorbed in the spacer, so that the space occupied by the circuit board can be minimized, and a secondary battery having gas exhaust holes can be obtained.

Further, by fixing the spacer to the secondary battery, the circuit board can be positioned and held at a predetermined position.

Further, by forming the insulating sheet from a sticky or sticky and heat-shrinkable material,
Each of the constituent elements can be reliably included and formed into a secondary battery having an excellent appearance.

Further, input / output terminal symbols can be provided on the surface of the insulating sheet, thereby preventing connection errors.

In addition, a design can be applied to the surface of the insulating sheet, and a beautiful appearance can be given, and at the same time, instructions for use, notes, and the like can be clearly indicated.

Further, by forming a step for covering the insulating sheet at the periphery of the upper insulating plate and the lower insulating plate, the edge of the covered insulating sheet can be accommodated in the step.

Further, the lower insulating plate is provided with a recess for accommodating the accommodating recess of the lead plate and the bottom surface of the battery can, so that the lead plate can be accommodated and positioned on the bottom surface of the secondary battery.

The battery protection circuit according to a third aspect of the present invention includes:
A main control circuit and a sub-control circuit that double protects the secondary battery from overcharging, and an overcurrent prevention circuit that prevents overcurrent is provided in the main control circuit, thereby preventing damage to the secondary battery. Double protection is provided from applied overcharging and other means of preventing overcurrent can be eliminated.

Further, the battery protection circuit can be configured as a circuit without PTC due to the presence of the overcurrent prevention circuit, so that the battery protection circuit can be configured more compactly.

In addition, the structure of the battery protection circuit allows the use of a secondary battery having no PTC therein. By eliminating the PTC, the volume of the power generating element can be increased, and the capacity of the battery can be reduced. Expansion can be achieved.

Further, since the overcharge is reliably prevented by the double overcharge prevention function provided in the battery protection circuit, a rise in the internal pressure of the battery due to the overcharge is prevented, and the secondary battery has a current cutoff valve therein. , And the volume of the power generating element can be increased, and the battery capacity can be increased.

[0026]

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-type lithium ion secondary battery as shown in FIG. 3 is provided with a circuit board having a battery protection circuit for protecting from overcharge, overdischarge, etc. as shown in FIG. Are integrally mounted to form a secondary battery having a function of a battery protection circuit.

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,
Except for these terminal portions, all the upper insulating plate 13 and the lower insulating plate 1
The secondary battery 1 and a circuit board 9 that constitutes a battery protection circuit are integrally incorporated in a case where the secondary battery 1 and the insulating label 7 are covered.

FIG. 2 is an exploded view of 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 detection terminal 6, and an upper insulating plate 13 that insulates and covers the circuit board 9 are provided. A lead plate 10 joined to the bottom surface of the secondary battery 1 and extending the pair of lead portions 10a to the sealing portion side; a lower insulating plate 1 for insulatingly covering the bottom of the secondary battery 1
4 are provided.

As shown in FIG. 3, the secondary battery 1 has a power generating element 3 in a battery can 31 formed in a bottomed cylindrical shape having an oval cross section.
3 and is formed in a small and flat shape in which the open end of the battery can 31 is sealed with a gasket 35, a sealing plate 32 and a sealing portion provided with an electrode cap 34. 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. Also,
The negative electrode plate constituting the power generating element 33 is connected to the battery can 31, and the battery can 31 serves as a negative input / output terminal of the secondary battery 1.

The positive electrode input / output terminal 25 of the secondary battery 1
As shown in FIG. 4, the base 11b of the connection plate 11 formed in a U-shape is joined. The battery can 3 of the secondary battery 1
As shown in FIG. 5, a base 10 b of a U-shaped lead plate 10 is joined to the bottom surface of the battery 1, and a pair of leads 10 a, 10 a is formed along the side of the battery can 31 on the side of the sealing portion. Is extended to

A spacer 12 formed as shown in FIG. 6 is attached to the sealing portion side of the secondary battery 1. FIG.
As shown in (c), on the lower surface of the spacer 12, a positioning portion 37 that fits into the positive electrode input / output terminal 25 of the secondary battery 1 and a fitting portion 40 that fits into a concave portion on the side of the sealing portion of the secondary battery 1 are provided. The spacer 12 is positioned and fitted on the secondary battery 1. The spacer 12 has a connection plate through hole 3.
The lead portion 11a of the connection plate 11 joined to the positive electrode input / output terminal 25 penetrates through the connection plate through hole 38. The spacer 12 forms a flat seating surface that is separated from the secondary battery 1, and the seating surface includes a circuit board 9.
Since the recess 36 for accommodating the electronic component mounted thereon is formed, when the circuit board 9 is disposed thereon, the electronic component is accommodated in the recess 36 as shown in FIG. Is stacked on the secondary battery 1 only with the thickness of the substrate, and an increase in volume due to the provision of the battery protection circuit is suppressed.

FIG. 7 shows the structure of both the front and back sides of the circuit board 9, and the battery protection circuit shown in FIG. 8 is formed on the board. As shown in FIG. 7, the back side of the circuit board 9 (b)
A positive terminal 4, a negative terminal 5, a temperature detecting terminal 6, and connection plate conductor patterns 15a, 1b for connecting the connection plate 11 to the front side (a).
5b and lead plate conductor patterns 16a and 16b for connecting the lead plate 10 are formed. The circuit patterns formed on both sides are connected at important points by through holes 30. A pair of leads 11a, 11a of the connection plate 11 are passed through the lead through holes 20, 20 formed in the circuit board 9, and the leads 11a, 11a are bent onto the connection plate conductor patterns 15a, 15b, respectively, and soldered. I do. Further, a pair of lead portions 10a, 10a of the lead plate 10 are passed through the lead plate through recesses 29, 29 formed at both ends of the circuit board 9, and are bent and soldered on the lead plate conductor patterns 16a, 16b. The circuit board 9 is fixed on the spacer 12 by soldering the pair of lead portions 11a and 10a of the connection plate 11 and the lead plate 10, respectively.

The battery protection circuit shown in FIG. 8 is a main control circuit IC for protecting the secondary battery 1 from overcharge, overdischarge and overcurrent.
When a voltage in the state of overcharge, overdischarge, and overcurrent is detected, the FET, which is a switching element incorporated in the IC, is turned off, and a predetermined release voltage is detected by a hysteresis operation. Until the overcurrent state is released or until the overcurrent state is released, 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 overcharge, and energization is enabled in the charging direction when the input / output circuit is interrupted due to overdischarge. In addition to the main control circuit IC21, a sub-control circuit IC22 for protecting the secondary battery 1 from overcharge is provided. The sub control circuit IC22 normally controls the power MOSFET 23 connected in series to the input / output circuit to an on state to keep the input / output circuit conductive, and the main control circuit IC2
When the overcharge prevention operation is not performed due to the operation abnormality of the power MOS1, the progress of the overcharge state is detected and the power MOS
The input / output circuit is cut off by controlling the FET 23 to an off state,
The off state is maintained until a predetermined release voltage is detected by the hysteresis operation, thereby preventing the secondary battery 1 from being damaged due to the progress of overcharge. With this configuration, the secondary battery 1 is doubly protected from overcharging, and in particular, the secondary battery 1 that is significantly damaged by overcharging can be protected by the battery protection circuit. Therefore, a current cutoff valve or a PTC (Positive Temperature) conventionally provided in the battery to protect the battery.
It is also possible to abolish the Coefficient (Coefficient), and this 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 or 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. In addition, if the PTC is configured as a part of the battery protection circuit, the space occupied by the battery protection circuit increases, which hinders miniaturization. .

As shown in FIG. 7A, 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 used as a terminal as it is without joining a plate material as a terminal.

As described above, by mounting the spacer 12 and the circuit board 9 on the secondary battery 1, FIG.
As shown in the circuit diagram of FIG. 1, the secondary battery 1 and the battery protection circuit formed on the circuit board 9 are connected, and the input / output of the secondary battery 1 is made via the battery protection circuit. As shown in FIG. 9, a secondary battery 1a in which a battery protection circuit is integrated is configured. As shown in FIG. 9, this secondary battery 1a
When the plus terminal window 4b, the minus terminal window 5b, and the temperature detection terminal window 6b are accommodated in the lower case 41 having openings, and the lower case 41 is closed with the upper case 42, the battery pack can be configured as a battery pack. Also, instead of the upper case 42,
Secondary battery 1a with integrated battery protection circuit and lower case 41
May be covered with an insulating sheet.

In the present embodiment, the spacer 12 and the circuit board 9 are not provided in the form of a battery pack as described above, but in the form of a secondary battery having a battery protection circuit as shown in FIG. The processing described below is added to the secondary battery 1a to which is attached. That is, as shown in FIG. 2, the upper insulating plate 13 is disposed on the circuit board 9 and the lower insulating plate 14 is disposed on the bottom surface of the secondary battery 1. Insulating labels 7 are coated on the entire peripheral surface including the battery, thereby completing a secondary battery having a battery protection circuit having a form as shown in FIG.

As shown in FIG. 10, the upper insulating plate 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 a step portion 43 is formed around the periphery thereof so as to cover an end of the insulating label 7. As shown in FIG. 11A, a lead groove for accommodating the lead plate 10 is formed on the inner surface of the lower insulating plate 14, and a curved surface corresponding to the shape of the bottom surface of the secondary battery 1 is formed around the lower insulating plate 14. Is formed. In addition, as shown in FIG. 11C, a step portion 45 is formed around the outer surface side so as to cover an end of the insulating label 7.

When the insulating label 7 is formed by applying a heat-shrinkable sheet to a pressure-sensitive adhesive, it is adhered to each constituent member, and is also integrated by covering each constituent member by heat shrinkage. Can be done. In addition, since the insulating label 7 can be designed and printed on its surface, it can be used as an exterior body having a beautiful appearance, and display of input / output terminal symbols, instructions for use, precautionary notes, etc. can do.

In the secondary battery provided with the battery protection circuit configured as described above, as shown in FIG. 1, the battery protection circuit is provided only by slightly extending the height of the secondary battery 1,
If the device is set in this state, the device itself has a battery protection function, and a highly reliable battery can be used. Further, since the plus terminal 4, the minus terminal 5, and the temperature detecting terminal 6 arranged on the upper surface are arranged asymmetrically on the left and right, it is possible to prevent the device from being reversely loaded.

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.

The thermistor 24 is connected to the temperature detecting terminal 6.
Is connected, and the thermistor 24 is connected to the secondary battery 1 of the circuit board 9.
As it is located closer to the main control circuit IC21, it changes its resistance value in response to the temperature of the secondary battery 1 and the main control circuit IC21. When connected to the temperature detection terminal 6 in a device using a battery, the temperature can be detected to cope with an abnormal temperature rise.

Further, the secondary battery 1 applied to this 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.

[0044]

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. 1A is a side view showing a configuration of a secondary battery with a battery protection device according to an embodiment, in which FIG. 1A is a side view showing a state where a coating of a 1/2 insulating label is removed, and FIG. FIG. 3C is a bottom view showing the configuration of the bottom surface.

FIG. 2 is a side view showing a disassembled structure of each component.

FIGS. 3A and 3B are plan views showing the configuration of a secondary battery, and FIGS.
Is a sectional view.

FIG. 4 is a perspective view showing a configuration of a connection plate.

FIG. 5 is a perspective view showing a configuration of a lead plate.

6A is a plan view showing a configuration of a spacer, and FIG.
Is a sectional view taken along the line AA, (c) is a rear view.

FIGS. 7A and 7B show the configuration of the circuit board, FIG.
Is a plan view of the back side.

FIG. 8 is a circuit diagram showing an electrical configuration of a secondary battery with a battery protection device.

FIG. 9 is a perspective view showing an example applied to the form of a battery pack.

10A is a plan view showing a configuration of an upper insulating plate, FIG.
(B) is a sectional view taken along line BB, (c) is a rear view.

11A is a plan view showing a configuration of a lower insulating plate, FIG.
(B) is a sectional view taken along line CC, and (c) is a rear view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Secondary battery 4 Positive terminal 5 Minus terminal 6 Temperature detection terminal 7 Insulation label 9 Circuit board 10 Lead plate 11 Connection plate 12 Spacer 13 Upper insulation plate 14 Lower insulation plate 15 Connection plate conductor pattern 16 Lead plate conductor pattern 20 Lead Through-hole 21 Main control circuit IC 22 Sub-control circuit IC 23 Power MOSFET 24 Thermistor 25 Positive electrode input / output terminal (protruding terminal) 29, 39 Lead plate through recess 31 Battery can 33 Power generation element 37 Positioning section 40 Insertion section 41 Lower case (pack) Case) 42 Upper case (pack case) 43, 45 Step 44 Lead groove

Continuation of the front page F term (reference) 5H022 AA09 CC09 KK01 5H029 AJ12 AK00 AL00 AM01 BJ02 BJ14 DJ02 5H030 AA07 AA10 AS05 AS11 FF22 FF43 FF44

Claims (17)

[Claims] A positive electrode is provided on a battery can in which a power generating element is housed in a bottomed cylindrical container, and on a protruding terminal provided insulated from the battery can on a sealing portion for sealing an open end of the battery can. Or a secondary battery in which a negative electrode is set, a battery protection circuit integrally provided with a battery protection circuit for protecting the secondary battery from overcharge, overdischarge, etc. 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 is formed to form a connection between the battery and the secondary battery. By disposing a spacer for separating the lead plate and the connection plate joined to the battery can at predetermined positions of the circuit board, respectively.
The secondary battery and the circuit board are integrated, the secondary battery and the battery protection circuit are electrically connected, and the positive electrode and / or the negative electrode of the secondary battery are connected to the input / output terminal via the battery protection circuit, An upper insulating plate having an opening formed in an input / output terminal portion is disposed on the circuit board, a lower insulating plate is disposed on a bottom surface of the battery can, and all sides from the peripheral portions of the upper insulating plate and the lower insulating plate. A secondary battery provided with a battery protection circuit, wherein a peripheral surface 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 insulated from the battery can on a sealing portion for sealing an open end of the battery can. Or a secondary battery in which a negative electrode is set, a battery protection circuit integrally provided with a battery protection circuit for protecting the secondary battery from overcharge, overdischarge, etc. 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 is formed to form a connection between the battery and the secondary battery. By disposing a spacer for separating the lead plate and the connection plate joined to the battery can at predetermined positions of the circuit board, respectively.
The secondary battery and the circuit board were integrated, the secondary battery and the battery protection circuit were electrically connected, and the positive electrode and / or the negative electrode of the secondary battery were connected to the input / output terminal via the battery protection circuit. A secondary battery with a battery protection circuit is constituted, and the secondary battery with the battery protection circuit is housed in a case having an opening formed at a position corresponding to an input / output terminal, A secondary battery with a battery protection circuit. 3. The connecting board and the lead board are connected to the circuit board by a pair of lead portions, respectively.
A secondary battery provided with the battery protection circuit according to the above. 4. A secondary battery comprising the battery protection circuit according to claim 1, wherein a plurality of input / output terminals provided on a circuit board are arranged asymmetrically. 5. A secondary battery comprising the battery protection circuit according to claim 1, wherein the input / output terminal is a conductor pattern for a terminal formed on a circuit board. 6. The input / output terminal is formed by joining a metal plate to a terminal conductor pattern formed on a circuit board.
A secondary battery provided with the battery protection circuit according to any one of claims 4 to 10. 7. A secondary having a battery protection circuit according to claim 1, wherein a positioning portion for the secondary battery, an accommodating portion for an electronic component mounted on a circuit board, and a gas outlet are formed in the spacer. battery. 8. A secondary battery provided with the battery protection circuit according to claim 1, wherein the spacer is fixed to the secondary battery. 9. The secondary battery provided with a battery protection circuit according to claim 1, wherein the insulating sheet is formed of an adhesive or an adhesive and heat-shrinkable material. 10. A secondary battery comprising the battery protection circuit according to claim 1, wherein a design is applied to a surface of the insulating sheet. 11. A secondary battery provided with a battery protection circuit according to claim 1, wherein input / output terminal symbols are provided on the surface of the insulating sheet. 12. The battery protection circuit according to any one of claims 1, 9, 10, and 11, wherein a step for covering an insulating sheet is formed at a peripheral portion of the upper insulating plate and the lower insulating plate. Rechargeable battery. 13. A rechargeable battery having a battery protection circuit according to claim 1, wherein the lower insulating plate is formed with a recess for accommodating the receiving recess of the lead plate and a bottom surface of the battery can. 14. A secondary battery comprising the battery protection circuit according to claim 1 or 2, wherein the battery protection circuit includes a main control circuit and a sub control circuit for double protecting the secondary battery from overcharge. 15. A secondary battery comprising the battery protection circuit according to claim 1, wherein the battery protection circuit is configured as a circuit without PTC. 16. A secondary battery provided with the battery protection circuit according to claim 1, wherein the secondary battery does not have a PTC therein. 17. A secondary battery provided with the battery protection circuit according to claim 1, wherein the secondary battery does not have a current cutoff valve therein.