JPH08203568A - Secondary battery pack - Google Patents

Abstract

PURPOSE: To efficiently and surely hold and exhibit large-capacity function by setting resistance for current detection of a wiring circuit as pattern resistance. CONSTITUTION: A resistance pattern 3' for current detection is interposed in a wiring circuit 6a which is provided with a wiring pattern for connecting to a battery group in which secondary batteries 1a are connected in series, and a wiring pattern for connecting to a capacity detection circuit part 4. And the pattern 3' is formed as a pattern continuing (linking) to the wiring patterns, etc., connected to the group 1 and the part 4. In this case, both ends of the pattern 3' are electrically connected to the part 4 respectively by a wiring pattern and current is measured from the voltage between the both ends of the pattern 3'. Secondarily, this measurement value is input in the part 4 and the charge quantity in the present states of the secondary battery system power supply is detected in real time based on a data holding means (for example, an IC memory) of the part 4. And adoption of such constitution for the secondary battery pack can easily secure functional reliability, reduce total cost, and improve yield.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a secondary battery pack,
More specifically, the present invention relates to an improvement of a secondary battery pack having a simplified structure and improved reliability.

[0002]

2. Description of the Related Art In portable electronic devices, a secondary battery that can be charged / discharged and functions as a semi-permanent power source is
Generally used as a driving power supply. In addition, while higher capacity (or higher capacity) of the driving power source is required due to the higher functionality and higher capacity of portable electronic devices, it is also desired that handling and use be easy. To meet such demands, it is known to combine a plurality of secondary batteries of the same standard and pack them to increase the power supply capacity. In addition, while the discharge remaining amount (remaining capacity) or the unbalanced state of the secondary battery pack is detected by the capacity detection circuit unit or the unbalanced detection circuit unit to avoid overcharge or overdischarge, the secondary battery pack is used as a secondary battery pack. , Known to ensure the required functionality.

FIG. 4, FIG. 5 and FIG. 6 show examples of circuit configurations for avoiding overcharge and overdischarge in the secondary battery pack. That is, in FIG. 4, the constant resistor 3 is inserted in the series connection circuit of the secondary batteries 1a and 2a, the current is measured from the voltage across the constant resistor 3, and this measured value is used as the capacitance detection circuit unit 4 It is configured to input to. Here, when data is input, based on the data holding means (for example, IC memory, microcomputer, voltage measurement system) of the capacity detection circuit unit 4, the current charge amount (remaining discharge amount) of the secondary battery system power supply. Is detected realistically.

FIG. 5 shows that the constant resistance bodies 3a and 3b are inserted in each series connection circuit of the secondary batteries 1a, 2a and 1b and 2b, and the current is measured from the voltage between both ends of the respective constant resistance bodies 3a and 3b. do it,
A configuration is adopted in which these measured values are input to the unbalance detection circuit unit 5. Here, when data is input, data holding means (for example, IC
Based on the memory, the microcomputer, and the voltage measurement system), the current charge amount (remaining discharge amount) of each series-connected power source of the secondary batteries 1a, 2a and 1b, 2b is realistically detected. Further, FIG. 6 is a circuit configuration capable of realistically detecting the current charge amount (remaining discharge amount) of the secondary battery system power source and the current charge state or discharge state of the series-connected system power sources arranged in parallel. Is taking.

In each of the above circuit configurations, the surface mount resistors or thin plates are used as the constant resistors 3, 3a and 3b, in other words, the current detecting resistor 3 and the unbalance detecting resistors 3a and 3b. It adopts the configuration in which a type resistor is mounted.

[0006]

However, the means for detecting the current state of charge (remaining discharge amount) of the secondary battery pack, the balance state of charge and discharge in the parallel connection system, etc., is the construction of the secondary battery pack. It becomes complicated,
Not practical enough. That is, in the configuration of the wiring circuit, surface mount resistors or thin plate resistors are used as the current detecting resistor 3 and the imbalance detecting resistors 3a and 3b. Then, the insertion of these resistors into the wiring circuit, for example, mounting by so-called soldering at a predetermined location of a flexible wiring board,
Or it is implemented by spot welding.
Therefore, not only the required wiring circuit configuration becomes complicated, but also the reliability of electrical connection is a concern. In particular, in response to the demand for downsizing of the rechargeable battery pack in accordance with the downsizing of the rechargeable battery pack or the high performance of the rechargeable battery pack, the thickness of the resistors (resistive parts) 3, 3a, 3b, mounting, The complexity of the connection process and the reliability of the electrical connection are serious problems. In addition, the heat generation due to the resistance and electromotive force of the connection part associated with the mounting / connection of the resistors 3, 3a, 3b may adversely affect the wiring circuit and the detection circuit parts 4, 5. .

The present invention has been made in consideration of such circumstances, and an object of the present invention is to provide a secondary battery pack capable of efficiently and surely retaining and exhibiting the capacity increasing function.

[0008]

A first secondary battery pack according to the present invention detects a battery group formed by electrically connecting a plurality of chargeable / dischargeable batteries and a remaining battery capacity of the battery group. And a circuit board having a wiring circuit including a current detection resistor for electrically connecting the capacity detection circuit section and the battery group, and a circuit board having an input / output terminal section, the capacity detection circuit section and circuit A secondary battery pack comprising an outer case for exposing a battery group and a circuit board integrally by exposing an input / output terminal portion of the board, wherein a resistance for current detection of the wiring circuit is patterned. It is characterized by the resistance.

A second secondary battery pack according to the present invention is a battery group formed by electrically connecting a plurality of chargeable / dischargeable batteries, and an unbalance detection circuit section for detecting the remaining battery capacity of the battery group. And a circuit board having a wiring circuit including an unbalance detection resistor for electrically connecting the capacity detection circuit section and a battery group, and a circuit board having an input / output terminal section, and input / output of the capacity detection circuit section and the circuit board A secondary battery pack comprising an exterior case for exposing a terminal portion and integrally accommodating and enclosing a battery group and a circuit board, wherein an unbalance detection resistance of the wiring circuit is a pattern resistance. It is characterized by

A third secondary battery pack according to the present invention is a battery group formed by electrically connecting a plurality of chargeable / dischargeable batteries, a capacity detection circuit section for detecting the remaining battery capacity of the battery group, and An unbalanced detection circuit unit, and a wiring circuit including a current detection resistor electrically connecting the capacity detection circuit unit and the battery group and an unbalanced detection resistor,
And a circuit board having an input / output terminal section, and an outer case for exposing and accommodating the capacitance detection circuit section and the input / output terminal section of the circuit board to integrally house and seal the battery group and the circuit board. The secondary battery pack is characterized in that the current detection resistance and the unbalance detection resistance of the wiring circuit are pattern resistances.

In the present invention, a required wiring circuit is provided,
Moreover, examples of the circuit board having the input / output terminal portion include a flexible wiring board and a rigid wiring board. More specifically, for example, a wiring board using a polyimide resin film as a base material, for example, a wiring board using a glass cloth-polyimide resin or a glass cloth-epoxy resin material as a base material can be used. Further, the current detection resistor and the imbalance detection resistor in the wiring circuit provided in the wiring board have a pattern formed by selective etching of the resistive metal thin film, a pattern formed by selective vapor deposition, or a pattern formed by printing. These can be formed at the same time as another wiring circuit.

[0012]

In the case of the first aspect of the present invention, since the current detection resistance pattern is inserted in the wiring circuit, not only the complicated assembling operation is greatly simplified, but also the wiring circuit section Since compactness and highly reliable connection are ensured and the remaining capacity can be easily detected, the secondary battery pack can be made highly functional.

In the case of the second aspect of the present invention, since the unbalance detecting resistance pattern is inserted in the wiring circuit, not only the complicated assembling operation is greatly simplified, but also the wiring circuit section is provided. The compactness and highly reliable connection can be ensured, and the charge / discharge balance state can be easily detected, so that the secondary battery pack can be highly functionalized.

In the case of the third aspect of the present invention, since the current detection resistance pattern and the unbalance detection resistance pattern are inserted in the wiring circuit, the complicated assembling operation is greatly simplified. Not only that, the wiring circuit section can be made compact and reliable connection can be secured, and the remaining capacity and the charge / discharge balance state can be easily detected, so that the function of the secondary battery pack can be improved. .

[0015]

Embodiments of the present invention will be described below with reference to FIGS.

FIG. 1 is a cross-sectional view showing a structural example of a main part of a secondary battery pack according to the present invention. Reference numeral 1 is a battery group formed by electrically connecting a plurality of chargeable / dischargeable batteries 1a, and 4 is the battery. A capacity detecting circuit section for detecting the remaining battery capacity of the group 1, 6 is provided with a wiring circuit 6a including a current detecting resistor 3'for electrically connecting the capacity detecting circuit section 4 and the battery group 1, and an input / output terminal It is a flexible circuit board having a portion 6b. Also, 7a,
Reference numeral 7b is an outer case that exposes the capacitance detection circuit section 4 and the input / output terminal section 6b of the circuit board 6 to integrally house and seal the battery group 1 and the circuit board 6. In this basic circuit configuration, the current detecting resistor 3'of the wiring circuit 6a is a pattern resistor.

That is, as shown in FIG. 2 in which the main part of the secondary battery pack is expanded and shown in perspective, the wiring pattern for connecting to the battery group 1 formed by connecting the secondary batteries 1a in series and the capacity detection circuit part 4 are shown. Wiring circuit 6a having a wiring pattern to be connected to
It is characterized in that the current detecting constant resistor 3'inserted in is formed as a pattern which is continuous (connected) with the wiring pattern or the like connected to the battery group 1 or the capacity detection circuit section 4.

Further, in this wiring circuit configuration, both ends of the constant resistance pattern 3'are electrically connected to the capacitance detection circuit section 4 by wiring patterns, respectively, and the voltage across the constant resistance pattern 3'is detected. The current is measured, and this measured value is input to the capacitance detection circuit unit 4 and based on the data holding means (for example, IC memory, microcomputer, voltage measurement system) of the capacitance detection circuit unit 4, the current state of the secondary battery system power supply. The amount of charge (remaining amount of discharge) at is actually detected.

FIG. 3 is an exploded perspective view showing a main part of the secondary battery pack according to the second invention. In this structure, the secondary batteries 1a are connected in series.
An unbalance detection constant inserted in a wiring circuit 6a having a wiring pattern to be connected to each of the battery groups 1 and 1 ', a wiring pattern to be connected to each of the battery groups 1 and 1'in the unbalance detection circuit section 5, and the like. It is characterized in that the resistors 3a ', 3a' are formed as a pattern that is continuous (connecting) with the wiring patterns connected to the battery groups 1, 1'and the unbalance detection circuit unit 5.

In this wiring circuit configuration, both ends of each of the constant resistance patterns 3a 'and 3a' are electrically connected to the unbalance detection circuit section 5 by a wiring pattern. Currents are respectively measured from the voltages across ‘′ and 3a’, and these measured values are input to the unbalance detection circuit unit 5 to hold data in the unbalance detection circuit unit 5 (for example, IC memory, microcomputer, voltage measurement system). )
Based on the above, the current state of balance of the charge amount (remaining discharge amount) of the secondary battery system power supply is realistically detected.
Further, in the case of the secondary battery pack according to the third invention, the circuit wiring 6a of the wiring board 6 is a combination of the circuit wirings shown in FIGS. 2 and 3 above. That is, the circuit configuration of FIG. 6 is adopted as the secondary battery pack, and the constant resistance 3 for current detection and the constant resistors 3a and 3b for unbalance detection are respectively set to the constant resistance pattern 3'for current detection and the constant resistance pattern for unbalance detection. The resistance patterns 3a 'and 3a' are formed.

In the circuit wiring, between both ends of the current detecting resistor 3'and the unbalance detecting resistor 3
The current is measured from the voltage between both ends of a ′ and 3b ′, and the measured values are input to the current detection circuit 4 and the unbalance detection circuit, and the current charge amount of the secondary battery system power supply ( The discharge remaining amount) and the balance state are detected realistically.

The present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the invention. For example, although a configuration example using a flexible circuit board as the circuit board has been described above, it is also possible to use a rigid type circuit board, and the chargeable / dischargeable battery has a shape other than the cylindrical shape. Of course it is also good.

[0023]

As described above, according to the present invention,
Secondary battery pack with capacity detection circuit to detect remaining capacity, secondary battery pack with unbalance detection circuit to detect unbalance during charging or discharging in each series battery group, or capacity detection circuit and In the secondary battery pack with the balance detection circuit, it is possible to reduce complexity and improve reliability as a battery system while eliminating complexity of the assembly configuration. That is,
By adopting the configuration of the secondary battery pack according to the present invention,
Easy to secure functional reliability, reduce total cost,
It is possible to improve the yield.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a main part of a configuration example of a secondary battery pack according to the present invention.

FIG. 2 is a developed perspective view of the secondary battery pack shown in FIG.

FIG. 3 is a developed perspective view of another configuration example of the secondary battery pack according to the present invention.

FIG. 4 is a circuit diagram of a secondary battery pack with a remaining capacity detection circuit.

FIG. 5 is a circuit diagram of a secondary battery pack with a charge / discharge imbalance detection circuit.

FIG. 6 is a circuit diagram of a secondary battery pack with a remaining capacity detection circuit and a charge / discharge unbalance detection circuit.

[Explanation of symbols]

1-Battery group 1a, 1b, 2a, 2b-Batteries that can be charged and discharged (secondary batteries) 3-Current detection resistors 3a, 3b-Imbalance detection resistors 3'-Current detection Resistance pattern
3a ', 3b' ... Resistance pattern for unbalance detection
4 ... Capacity detection circuit 5 ... Unbalance detection circuit 6 ... Circuit board 6a ... Wiring circuit 6b
...... Input / output terminals

Claims (3)

[Claims] 1. A battery group formed by electrically connecting a plurality of chargeable / dischargeable batteries, a capacity detection circuit section for detecting a remaining battery capacity of the battery group, and an electric capacity group for the capacity detection circuit section and the battery group. A circuit board having a wiring circuit including a current detection resistor to be electrically connected, and having an input / output terminal section, and exposing the capacity detection circuit section and the input / output terminal section of the circuit board to form a battery group and a circuit board. A secondary battery pack comprising an outer case that is integrally housed and sealed, wherein the current detection resistor of the wiring circuit is a pattern resistor. 2. A battery group formed by electrically connecting a plurality of chargeable / dischargeable batteries, an unbalance detection circuit section for detecting a remaining battery capacity of the battery group, a capacity detection circuit section and a battery group. A circuit board including a wiring circuit including an electrically connected unbalanced detection resistor and having an input / output terminal section, and exposing the capacity detection circuit section and the input / output terminal section of the circuit board to provide a battery group and a circuit. A secondary battery pack comprising an outer case that integrally houses and encloses plates, wherein the unbalance detection resistance of the wiring circuit is a pattern resistance. 3. A battery group formed by electrically connecting a plurality of chargeable / dischargeable batteries, a capacity detection circuit section and an unbalance detection circuit section for detecting the remaining battery capacity of the battery group, and the capacity detection circuit. Circuit board having a wiring circuit including a current detection resistance and an unbalance detection resistance for electrically connecting a battery section and a battery group, and an input / output terminal section; and the capacitance detection circuit section and the input / output terminal of the circuit board A secondary battery pack comprising an outer case that exposes a portion and integrally houses and encloses a battery group and a circuit board, wherein a current detection resistor and an unbalance detection resistor of the wiring circuit are provided. A secondary battery pack characterized in that each has a pattern resistance.