TWI402525B - Detecting circuit for detecting multiple cell units using internal resistance and battery pack having detecting capability - Google Patents

Description

Internal resistance multi-cell detection circuit and battery pack with battery detection function

The present invention relates to a battery detecting circuit and a battery pack, and more particularly to an internal resistance type multi-cell detecting circuit and a battery pack having a battery detecting function.

With the development of science and technology, the industry is increasingly improving, the functions of electronic products are becoming more and more diversified, and the occasions of using electronic products are no longer limited to engineering purposes, and have gradually been integrated into the daily life of human beings. In order to enable people to use these electronic products with various functions anytime and anywhere, more and more electronic products and mobile devices are designed as portable electronic devices and electric power mobile devices. Every portable electronic device or power-powered mobile device, such as a notebook computer, personal digital assistant (PDA), mobile phone, wireless power tool, remote control car, remote control aircraft, electric steam locomotive or electric bicycle, etc. The battery provides the power required for operation, and is environmentally friendly. Today, portable electronic devices and electric power mobile devices use rechargeable batteries.

Please refer to the first figure, which is a schematic diagram of the structure of a conventional battery pack. As shown in the first figure, the battery set 1 includes: a first battery unit B1, a second battery unit B2, a third battery unit B3, and a fourth battery unit B4, and each of the plastic batteries One battery unit B1~B4 is wrapped together. The battery unit 1 electrically connects the first battery unit B1, the second battery unit B2, the third battery unit B3, and the fourth battery unit B4 to each other in series, for example, the two ends of the first conductive metal M1 are respectively soldered to Positive electrode and second battery of the first battery unit B1 The negative electrode of the unit B2, the two ends of the second conductive metal M2 are respectively soldered to the anode of the third battery unit B3 and the cathode of the fourth battery unit B4, and the series voltage of the battery units B1 to B4 is connected by the wire 11 and the connector 12 The electrical energy is transferred to system circuitry (not shown) of the portable electronic device or the electrically powered mobile device to provide the electrical energy required for operation.

Each of the battery cells B1 B B4 of the battery pack 1 is of a rechargeable type. When a charging circuit (not shown) charges the battery pack 1 , the charging voltage is transmitted to the electrical connections in series by the wires 11 and the connector 12 . Battery unit B1~B4. In order to make the battery pack 1 have better battery efficiency to prevent the portable electronic device or the electrically powered mobile device from functioning properly, the charging circuit (not shown) charges the battery pack 1 in a preferred charging manner. For example, during charging, the charging circuit (not shown) first charges the battery pack 1 with a constant current until the voltage of the battery pack 1 rises to a critical voltage value, and then changes to a constant voltage ( Constant voltage) Charges battery pack 1.

Since the battery cells B1 to B4 have their service life, the battery efficiency of the battery unit will decrease correspondingly with the number of uses or the use time. Even if the battery pack 1 is charged in the above manner, the battery cells B1 to B4 still have battery efficiency. When it is not good. The battery efficiency and the storage capacity of each battery unit B1~B4 are different. If the battery efficiency of one of the battery units 1 is too low or the storage capacity is insufficient, the voltage of the completed battery pack 1 may reach the standard value. For example, 19.2V (volts), however, the overall battery efficiency and actual power storage capacity of the battery pack 1 cannot reach the standard value regardless of the charging time.

The conventional battery detecting circuit determines whether the battery efficiency of the battery unit 1 is too low or the actual power storage amount is insufficient by the series voltage of the battery units B1 to B4. Therefore, the conventional battery detecting circuit cannot accurately detect whether the battery efficiency of the battery unit 1 is low. Is it too low or the actual amount of electricity is insufficient? When the battery pack 1 whose battery efficiency is too low or the actual power storage amount is insufficient is considered to be good in battery efficiency or sufficient power storage to supply the portable electronic device or the electric power mobile device, the power supply time of the battery pack 1 is short and When the power supply voltage is unstable, when the battery pack 1 is exhausted, its rapidly falling voltage The value may cause the portable electronic device to fail to complete the shutdown process, thereby causing damage to the portable electronic device. In addition, the battery cells B1 B B4 in the conventional battery pack 1 are fixed by soldering. If only one of the battery cells has poor battery efficiency or the actual stored power is insufficient, the user can only discard the entire battery pack and cannot replace the battery pack. Battery cells that are inefficient in battery cells are very environmentally unfriendly. The user purchases another battery pack, which further increases the use cost of the portable electronic device or the electric power mobile device.

The purpose of the present invention is to provide an internal resistance type multi-cell detecting circuit, which can quickly and accurately detect the battery efficiency condition of each battery unit electrically connected in series, and prevent the battery from being detected by the battery. The circuit is misjudged to cause the battery pack to provide an unstable voltage, or to prevent the portable electronic device from completing the shutdown procedure and causing damage to the portable electronic device.

Another object of the present invention is to provide a battery pack with battery detection function, which can directly and accurately detect each battery unit of the electrical series connection by directly using the battery detection function of the battery pack without additional tools. Whether the battery efficiency condition and the actual chargeable capacity are normal, to prevent the battery pack from providing an unstable voltage due to the incorrect judgment of the battery detection circuit, or to prevent the portable electronic device from being damaged due to the failure of the portable electronic device to complete the shutdown procedure. Each battery unit of the battery pack is designed to be replaceable, and the user can replace only the battery unit with poor battery efficiency without discarding the entire battery pack, thereby reducing the use cost and complying with environmental protection.

In order to achieve the above object, a more general implementation of the present invention provides an internal resistance type multi-cell detecting circuit for respectively detecting a first battery unit and a second battery unit electrically connected in series, comprising: a detecting switch; The auxiliary voltage generating unit is configured to generate a first reference voltage; the first discharging unit is electrically connected to the first battery unit and the detecting switch, and the first discharging unit is detected by The switch causes the first battery unit to discharge the first discharge unit and generates a first discharge signal; the second discharge unit is electrically connected to the second battery unit and the detection switch, and the second discharge unit causes the second battery unit pair by detecting the switch The second discharge unit discharges and generates a second discharge signal; the first comparison circuit is electrically connected to the auxiliary voltage generating unit and the first discharge unit for generating the first battery unit status signal according to the first discharge signal; and the second a comparison circuit electrically connected to the auxiliary voltage generating unit and the second discharging unit for generating a second battery unit status signal according to the second discharging signal; wherein, when the detecting switch is turned on, the first battery unit and the second battery unit Discharging the first discharge unit and the second discharge unit respectively to perform battery detection, and reacting the state of the first battery unit state signal and the second battery unit status signal to the battery efficiency status or actuality of the first battery unit and the second battery unit Whether the amount of electricity that can be stored is normal.

In order to achieve the above object, another broad aspect of the present invention provides a battery pack having a battery detecting function, comprising: a first battery unit; a second battery unit electrically connected to the first battery unit; a detecting switch; a battery a state display unit configured to display whether a battery efficiency condition of the first battery unit and the second battery unit is normal; and an internal resistance multi-cell detection circuit for detecting battery efficiency status of the first battery unit and the second battery unit, respectively Wherein, when the detecting switch is turned on, the internal resistance type multi-cell detecting circuit respectively discharges the first battery unit and the second battery unit to perform battery detection, and displays the first battery unit and the second battery correspondingly in the battery state display unit. Whether the unit's battery efficiency condition or actual chargeable capacity is normal.

1‧‧‧Battery Pack

M1‧‧‧First Conductive Metal

B1~B4‧‧‧First to Fourth Battery Units

M2‧‧‧Second conductive metal

11‧‧‧Wire

12‧‧‧Connecting head

2‧‧‧Internal resistance multi-cell detection circuit

21‧‧‧Detection switch

22a~22d‧‧‧first to fourth auxiliary circuits

3‧‧‧System Circuit

23a~23d‧‧‧first to fourth discharge cells

31‧‧‧Power monitoring unit

23a1~23d1‧‧‧first to fourth isolation components

32‧‧‧Display unit

24a~24d‧‧‧first to fourth comparison circuits

41‧‧‧Shell

25a~25d‧‧‧first to fourth indicator circuits

42‧‧‧ cover

4‧‧‧Battery pack with battery detection

43‧‧‧Wire

B1a~B4a‧‧‧first to fourth battery cells

44‧‧‧Connecting head

LED1~LED4‧‧‧first to fourth light-emitting diodes

R1~R4‧‧‧first to fourth resistor

Rs1~Rs4‧‧‧first to fourth discharge resistors

Q1~Q4‧‧‧first to fourth switch

Ra~Rd‧‧‧first to fourth current limiting resistors

Vb1~Vb4‧‧‧first to fourth battery cell voltage

S1~S4‧‧‧first to fourth discharge signals

Vref1~Vref4‧‧‧first to fourth reference voltage

Sb1~Sb4‧‧‧first to fourth battery unit status signals

Vb‧‧‧ series voltage

The first picture is a schematic diagram of the structure of a conventional battery pack.

The second figure is a schematic diagram of the internal resistance multi-cell detection circuit of the preferred embodiment of the present invention.

The third figure is a schematic diagram of an internal resistance multi-cell detecting circuit of another preferred embodiment of the present invention.

Figure 4 is a schematic view showing the structure of a battery pack having a battery detecting function according to a preferred embodiment of the present invention.

Some exemplary embodiments embodying the features and advantages of the present invention are described in detail in the following description. It is to be understood that the present invention is capable of various modifications in the various aspects of the present invention, and the description and drawings are intended to be illustrative and not limiting.

The internal resistance multi-cell detection circuit and the battery detection function battery pack of the present invention are applicable to the power supply structure of multiple battery cells electrically connected in series. To explain the operation principle, four battery cells are electrically connected in series below. Power supply architecture, but not limited to this. Please refer to the second figure, which is a schematic diagram of the internal resistance multi-cell detection circuit of the preferred embodiment of the present invention. As shown in the second figure, the internal resistance type multi-cell detecting circuit 2 is configured to respectively detect the first battery unit B1a, the second battery unit B2a, the third battery unit B3a, and the fourth battery unit B4a electrically connected in series, The detection switch 21, the first auxiliary circuit 22a, the second auxiliary circuit 22b, the third auxiliary circuit 22c, the fourth auxiliary circuit 22d, the first discharge unit 23a, the second discharge unit 23b, the third discharge unit 23c, and the fourth The discharge unit 23d, the first comparison circuit 24a, the second comparison circuit 24b, the third comparison circuit 24c, and the fourth comparison circuit 24d.

In this embodiment, the first discharge unit 23a includes: a first isolation element 23a1, a first resistor R1, a first switch Q1, and a first discharge resistor Rs1; and the second discharge unit 23b includes: a second isolation element 23b1, a second The resistor R2, the second switch Q2, and the second discharge resistor Rs2; the third discharge unit 23c includes: a third isolation element 23c1, a third resistor R3, a third switch Q3, and a third discharge resistor Rs3; and the fourth discharge unit 23d includes: The fourth isolation element 23d1, the fourth resistor R4, the fourth switch Q4, and the fourth discharge resistor Rs4. The first isolation element 23a1, the second isolation element 23b1, the third isolation element 23c1, and the fourth isolation element 23d1 may be, but are not limited to, optically coupled isolation elements, and the first switch Q1, the second switch Q2, and the third switch Q3 And the fourth switch Q4 can be, but is not limited to, a Bipolar Junction Transistor (BJT), a Metal-Oxide-Semiconductor Field-Effect Transistor (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET), Insulated Gate Bipolar Transistor (IGBT) or relay (Relay) switching elements.

In this embodiment, the two input ends of the first isolation element 23a1 are electrically connected to the detection switch 21 and the negative electrode of the first battery unit B1a, and an output end of the first isolation element 23a1 is electrically connected to the first resistor R1. The other output end is electrically connected to the positive pole of the first battery unit B1a (ie, the output side of the first isolation element 23a1 and the first resistor R1 are electrically connected between the anode of the first battery unit B1a and the control end of the first switch Q1). The first switch Q1 and the first discharge resistor Rs1 are electrically connected in series between the positive and negative electrodes of the first battery unit B1a. The two input ends of the second isolation element 23b1 are electrically connected to the negative electrodes of the detection switch 21 and the second battery unit B2a, respectively. One output end of the second isolation element 23b1 is electrically connected to the second resistor R2, and the other output end is electrically connected. The second switch Q2 and the second discharge resistor Rs2 are electrically connected in series between the positive and negative electrodes of the second battery unit B2a. The two input ends of the third isolation element 23c1 are electrically connected to the negative electrodes of the detection switch 21 and the third battery unit B3a, respectively. One output end of the third isolation element 23c1 is electrically connected to the third resistor R3, and the other output end is electrically connected. The third switch Q3 and the third discharge resistor Rs3 are electrically connected in series between the positive and negative electrodes of the third battery unit B3a. The two input ends of the fourth isolation component 23d1 are electrically connected to the negative electrodes of the detection switch 21 and the fourth battery unit B4a, respectively. One output end of the fourth isolation component 23d1 is electrically connected to the fourth resistor R4, and the other output terminal is electrically connected. The fourth switch Q4 and the fourth discharge resistor Rs4 are electrically connected in series between the positive and negative electrodes of the fourth battery unit B4a.

The detecting switch 21 is electrically connected to the first battery unit B1a, the first isolation element 23a1, the second isolation element 23b1, the third isolation element 23c1, and the fourth isolation element 23d1, and the control end of the detection switch 21 is electrically connected to the system circuit. The power supply monitoring unit 31 of 3 controls the first discharge unit 23a, the second discharge unit 23b, the third discharge unit 23c, and the fourth discharge unit 23d by the detection switch 21 to make the first battery unit B1a, the second battery unit B2a, Third battery unit B3a and fourth The battery unit B4a approximates the short-circuit type discharge to the first discharge unit 23a, the second discharge unit 23b, the third discharge unit 23c, and the fourth discharge unit 23d, respectively. The input ends of the first auxiliary circuit 22a, the second auxiliary circuit 22b, the third auxiliary circuit 22c, and the fourth auxiliary circuit 22d are electrically connected to the positive electrode of the first battery unit B1a, the positive electrode of the second battery unit B2a, and the third battery, respectively. The anode of the unit B3a and the anode of the fourth battery unit B4a, and the outputs of the first auxiliary circuit 22a, the second auxiliary circuit 22b, the third auxiliary circuit 22c, and the fourth auxiliary circuit 22d are electrically connected to the first comparison circuit, respectively. a negative comparison terminal of 24a, a negative comparison terminal of the second comparison circuit 24b, a negative comparison terminal of the third comparison circuit 24c, and a negative comparison terminal of the fourth comparison circuit 24d for respectively generating a first reference voltage Vref1 and a second reference voltage Vref2, a third reference voltage Vref3, and a fourth reference voltage Vref4.

When the power source monitoring unit 31 controls the detection switch 21 to be turned on to cause the internal resistance type multi-cell unit detecting circuit 2 to perform battery detection, the series connection of the first battery unit B1a, the second battery unit B2a, the third battery unit B3a, and the fourth battery unit B4a The voltage Vb is transmitted to the input sides of the first isolation element 23a1, the second isolation element 23b1, the third isolation element 23c1, and the fourth isolation element 23d1 via the detection switch 21, so that the first isolation element 23a1 and the second isolation element 23b1 The output sides of the three isolation elements 23c1 and the fourth isolation elements 23d1 are in an on state. Therefore, the series voltage Vb is transmitted to the control terminal of the first switch Q1 via the output side of the first isolation element 23a1 and the first resistor R1 to turn on the first switch Q1. Similarly, the second switch Q2, the third switch Q3, and the The four switches Q4 are in an on state.

During the battery detection process, the first battery cell voltage Vb1 of the first battery unit B1a generates a first discharge signal S1 by approximately short-circuiting the first discharge resistor Rs1 via the first switch Q1 (for example, the battery unit is approximately short-circuited). The discharge is such that the discharge current is 50% to 150% of the rated current value), and the second battery cell voltage Vb2 of the second battery cell B2a is approximately short-circuited by the second switch Q2 to the second discharge resistor Rs2. Second discharge signal S2, third battery unit The third battery cell voltage Vb3 of B3a generates a third discharge signal S3 by a short-circuit discharge of the third discharge resistor Rs2 via the third switch Q3, and the fourth battery cell voltage Vb4 of the fourth battery cell B4a passes the fourth switch. Q4 approximates the short-circuit discharge to the fourth discharge resistor Rs4 to generate a fourth discharge signal S4.

In this embodiment, the negative comparison ends of the first comparison circuit 24a, the second comparison circuit 24b, the third comparison circuit 24c, and the fourth comparison circuit 24d are electrically connected to the output end of the first auxiliary circuit 22a and the second auxiliary circuit. The output end of 22b, the output end of the third auxiliary circuit 22c, and the output end of the fourth auxiliary circuit 22d, and the positive comparison end of the first comparison circuit 24a, the positive comparison end of the second comparison circuit 24b, and the third comparison circuit 24c The positive comparison terminal and the positive comparison terminal of the fourth comparison circuit 24d are electrically connected to the first discharge resistor Rs1, the second discharge resistor Rs2, the third discharge resistor Rs3, and the fourth discharge resistor Rs4, respectively, wherein the first comparison circuit 24a compares A discharge signal S1 and the first reference voltage Vref1 generate a corresponding first battery unit status signal Sb1, and the second comparison circuit 24b compares the second discharge signal S2 with the second reference voltage Vref2 and generates a corresponding second battery unit status signal Sb2. The third comparison circuit 24c compares the third discharge signal S3 with the third reference voltage Vref3 and generates a corresponding third battery unit status signal Sb3, and the fourth comparison circuit 24d compares the fourth discharge signal. S4 and the fourth reference voltage Vref4 and generates a corresponding fourth cell state signal Sb4.

In this embodiment, the first comparison circuit 24a, the second comparison circuit 24b, the third comparison circuit 24c, and the fourth comparison circuit 24d are low-power operational amplifiers (OPs), and the minimum operating voltage of the normal operation. The voltage value when the battery unit is depleted, for example, 2.4 V. Therefore, when the voltage value of the battery cell voltage (Vb1, Vb2, Vb3, Vb4) is lowered during the battery detection process, the first comparison circuit 24a, the first The second comparison circuit 24b, the third comparison circuit 24c, and the fourth comparison circuit 24d can still operate normally.

The voltage of the battery unit will vary with the storage capacity of the battery unit, such as lithium ion (Li-Ion) The voltage of the battery unit when the power storage is full and the power storage is exhausted is 4.2V and 3.5V respectively. Therefore, it can be judged whether the storage capacity of the battery unit is sufficient by the voltage of the battery unit, but the battery unit The actual chargeable capacity and battery efficiency cannot be judged by the voltage level of the battery unit. In fact, the internal resistance of the battery unit will vary with the actual storage capacity of the battery unit and the battery efficiency. For example, the internal resistance of the lithium ion battery unit when the battery efficiency is normal is about 0.035 to 0.05 Ω (ohm). The internal resistance of the battery efficiency is about 100~300Ω. Therefore, by measuring the internal resistance of the battery unit, the actual storage capacity and battery efficiency of the battery unit can be accurately detected. However, the internal resistance of the battery unit is small, and the internal resistance of the battery unit cannot be measured in a general manner, and the battery unit must measure the internal resistance of the battery unit by means of a large current discharge (approximate short-circuit discharge). For example, the battery unit is approximately short-circuited to have a discharge current of 50% to 150% of the rated current value.

According to the concept of the present invention, the designer can select the first discharge resistor Rs1 and the second discharge resistor with appropriate resistance values according to the internal resistances of the first battery unit B1a, the second battery unit B2a, the third battery unit B3a, and the fourth battery unit B4a. Rs2, a third discharge resistor Rs3, and a fourth discharge resistor Rs4. During the battery detection process, the first discharge signal S1, the second discharge signal S2, the third discharge signal S3, and the fourth discharge signal S4 are subjected to the first battery unit B1a, the second battery unit B2a, the third battery unit B3a, and the first The internal resistance of the four battery cells B4a affects the corresponding first discharge signal S1 if the internal resistance of one of the first battery unit B1a, the second battery unit B2a, the third battery unit B3a, and the fourth battery unit B4a is excessive. The second discharge signal S2, the third discharge signal S3 or the fourth discharge signal S4 may be smaller than the corresponding first reference voltage Vref1, the second reference voltage Vref2, the third reference voltage Vref3 or the fourth reference voltage Vref4, so that the corresponding first The battery unit status signal Sb1, the second battery unit status signal Sb2, the third battery unit status signal Sb3, or the fourth battery unit status signal Sb4 are changed from the normal state to the abnormal state.

For example, in the battery detection process, if the internal resistance of the first battery unit B1a is too large or different In a normal state, the corresponding first discharge signal S1 is smaller than the first reference voltage Vref1, so that the first battery unit status signal Sb1 outputted by the first comparison circuit 24a is changed from the normal state to the abnormal state. Therefore, the power supply monitoring unit 31 can be abnormal. The first battery unit state signal Sb1 of the state determines that the battery efficiency condition of the first battery unit B1a is abnormal, that is, the actual power storage capacity of the first battery unit B1a is too low, and displays the abnormality of the first battery unit B1a on the display unit 32. Warning message.

In this embodiment, the auxiliary voltage generating unit includes a first auxiliary circuit 22a, a second auxiliary circuit 22b, a third auxiliary circuit 22c, and a fourth auxiliary circuit 22d, and is supported by the first auxiliary circuit 22a and the second auxiliary circuit 22b. The third auxiliary circuit 22c and the fourth auxiliary circuit 22d respectively convert the first battery cell voltage Vb1, the second battery cell voltage Vb2, the third battery cell voltage Vb3, and the fourth battery cell voltage Vb4 into a first reference voltage Vref1, and a second The reference voltage Vref2, the third reference voltage Vref3, and the fourth reference voltage Vref4 are selected by the designer according to the internal resistances of the first battery unit B1a, the second battery unit B2a, the third battery unit B3a, and the fourth battery unit B4a. The first reference voltage Vref1, the second reference voltage Vref2, the third reference voltage Vref3, and the fourth reference voltage Vref4 of the appropriate voltage value are not limited thereto.

In some embodiments, since the internal resistances of the first battery unit B1a, the second battery unit B2a, the third battery unit B3a, and the fourth battery unit B4a are the same, the auxiliary voltage generating unit may include only a single first auxiliary circuit 22a ( Not shown), and only the first reference voltage Vref1 is generated to the first comparison circuit 24a, the second comparison circuit 24b, the third comparison circuit 24c, and the negative comparison terminal (not shown) of the fourth comparison circuit 24d, so that the first The comparison circuit 24a, the second comparison circuit 24b, the third comparison circuit 24c, and the fourth comparison circuit 24d respectively respectively discharge the first discharge signal S1, the second discharge signal S2, the third discharge signal S3, and the fourth discharge signal S4 with the first reference The voltages Vref1 are compared to generate corresponding first battery unit status signals Sb1, second battery unit status signals Sb2, third battery unit status signals Sb3, and fourth battery unit status signals Sb4, respectively. Similarly, during the battery detection process, if the first battery unit B1a, the second battery unit B2a, and the third battery unit B3a are When the internal resistance of one of the fourth battery cells B4a is too large, the corresponding first discharge signal S1, second discharge signal S2, third discharge signal S3 or fourth discharge signal S4 is smaller than the first reference voltage Vref1, so that the corresponding The first battery unit status signal Sb1, the second battery unit status signal Sb2, the third battery unit status signal Sb3, or the fourth battery unit status signal Sb4 are changed from the normal state to the abnormal state.

In general, the first comparison circuit 24a, the second comparison circuit 24b, the third comparison circuit 24c, and the fourth comparison circuit 24d are respectively based on the first discharge signal S1, regardless of whether the auxiliary voltage generating unit includes a single or four auxiliary circuits. The second discharge signal S2, the third discharge signal S3, and the fourth discharge signal S4 generate corresponding first battery unit status signal Sb1, second battery unit status signal Sb2, third battery unit status signal Sb3, and fourth battery unit status signal. Sb4, the states of the first battery unit status signal Sb1, the second battery unit status signal Sb2, the third battery unit status signal Sb3, and the fourth battery unit status signal Sb4 are reflected by the first battery unit B1a, the second battery unit B2a, Whether the battery efficiency condition or the actual chargeable amount of the third battery unit B3a and the fourth battery unit B4a is normal.

Please refer to the third figure and the second figure. The third figure is a schematic diagram of the internal resistance multi-cell detecting circuit of another preferred embodiment of the present invention. The third figure is different from the second figure in that the internal resistance multi-cell detecting circuit 2 of the third figure further includes: a first indicating circuit 25a, a second indicating circuit 25b, a third indicating circuit 25c, and a fourth indicating circuit 25d. The battery state display unit is constructed, and the detection switch 21 can be controlled to be turned on or off by the user. The first indication circuit 25a, the second indication circuit 25b, the third indication circuit 25c, and the fourth indication circuit 25d are respectively configured according to the first battery unit status signal Sb1, the second battery unit status signal Sb2, and the third battery unit status signal Sb3. And the fourth battery unit status signal Sb4 respectively displays whether the battery efficiency status of the first battery unit B1a, the second battery unit B2a, the third battery unit B3a, and the fourth battery unit B4a is normal.

In this embodiment, the battery state display unit is implemented by four indicating circuits (25a, 25b, 25c, 25d) including four light emitting elements (LED1, LED2, LED3, LED4), but not limited thereto. In an embodiment, the battery state display unit is implemented by a liquid crystal display panel (LCD panel). Similarly, the liquid crystal display panel (not shown) is configured according to the first battery unit status signal Sb1 and the second battery unit status signal Sb2. The three battery unit status signal Sb3 and the fourth battery unit status signal Sb4 respectively indicate whether the battery efficiency status of the first battery unit B1a, the second battery unit B2a, the third battery unit B3a, and the fourth battery unit B4a is normal. In this embodiment, the first indicating circuit 25a, the second indicating circuit 25b, the third indicating circuit 25c, and the fourth indicating circuit 25d respectively adopt the first light emitting diode LED 1, the second light emitting diode LED 2, and the third light emitting, respectively. The four light-emitting elements, such as the diode LED 3 and the fourth light-emitting diode LED 4, are realized, but not limited thereto, and can also be realized by other light-emitting elements.

In this embodiment, the first indicating circuit 25a, the second indicating circuit 25b, the third indicating circuit 25c, and the fourth indicating circuit 25d further include a first current limiting resistor Ra, a second current limiting resistor Rb, and a third current limiting current, respectively. The resistor Rc and the fourth current limiting resistor Rd are used to limit the current flowing through the light emitting diodes (LED1, LED2, LED3, LED4). The two ends of the first current limiting resistor Ra are electrically connected to the output ends of the first LED diode 1 and the first comparison circuit 24a, respectively, and the two ends of the second current limiting resistor Rb are respectively connected to the second LED. The output ends of the LEDs 2 and the second comparison circuit 24b are electrically connected in series and then electrically connected. The two ends of the third current limiting resistor Rc are respectively electrically connected to the outputs of the third LEDs 3 and the third comparator circuit 24c. The two ends of the fourth current limiting resistor Rd are electrically connected to the output ends of the fourth LED and the fourth comparator circuit 24d. The electrical connection order of the current limiting resistors (Ra, Rb, Rc, Rd) and the light emitting diodes (LED1, LED2, LED3, LED4) is not limited to the third figure, and may be reversed in this embodiment (not Graphic).

In this embodiment, the detecting switch 21 is implemented by a push-type switching element, but not limited thereto. When the user presses the detecting switch 21, the turned-on detecting switch 21 causes the internal resistance type multi-cell unit to be inspected. The measuring circuit 2 performs battery detection to make the first battery unit status signal Sb1, the second battery unit status signal Sb2, the third battery unit status signal Sb3, and the fourth battery unit status signal Sb4 along with the first battery unit B1a and the second battery. The internal resistances of the unit B2a, the third battery unit B3a, and the fourth battery unit B4a are changed to reflect whether the battery efficiency condition of the corresponding battery unit is normal. Therefore, if the battery efficiency state of the corresponding battery unit is abnormal, the corresponding battery unit status signal changes from the normal state to the abnormal state, so that the corresponding light-emitting diode emits light to reach the user clearly indicating the battery. The battery efficiency of the unit is an abnormal purpose.

For example, in the battery detection process, if the internal resistance of the second battery unit B2a is too large or abnormal, the corresponding second discharge signal S2 is smaller than the second reference voltage Vref2, so that the second battery output by the second comparison circuit 24b The unit state signal Sb2 is changed from the normal state to the abnormal state. Therefore, the corresponding second LED LED 2 emits light, indicating that the battery efficiency condition of the second battery unit B2a is abnormal, that is, the actual stored amount of the second battery unit B2a. Too low. In the present embodiment, the normal state and the abnormal state are respectively high potential and low potential, for example, 3.3V and 0V, but not limited thereto, when the internal resistance type multi-cell detecting circuit 2 does not perform the battery detecting procedure, the height is high. The potential cell status signal does not cause the light-emitting elements of the indicating circuit to illuminate and consume electrical energy.

Please refer to the fourth figure and the third figure, wherein the fourth figure is a schematic structural diagram of the battery pack with the battery detecting function of the preferred embodiment of the present invention. As shown in the fourth figure, the battery pack 4 having the battery detecting function includes: a first light emitting diode LED 1, a second light emitting diode LED 2, a third light emitting diode LED 3, and a fourth light emitting diode LED 4. a first battery unit B1a, a second battery unit B2a, a third battery unit B3a, a fourth battery unit B4a, a detection switch 21, a housing 41, a cover 42, a wire 43 and a connector 44, wherein the first battery unit B1a The second battery unit B2a, the third battery unit B3a, and the fourth battery unit B4a are replaceably disposed in the housing 41. The cover 42 is detachably coupled to the housing 41 (not shown) for more securely arranging the battery unit within the housing 41. The wire 43 extends from one side of the housing 41 to the connector 44 for the first battery unit B1a, The series voltage Vb of the two battery cells B2a, the third battery cells B3a, and the fourth battery cells B4a is transmitted to a system circuit (not shown) of the portable electronic device or the electrically powered mobile device to provide electrical energy required for operation.

In the present embodiment, the battery pack 4 having the battery detecting function uses the internal resistive multi-cell detecting circuit 2 of the third figure, and its operation principle is the same as that described above. When the user presses the detecting switch 21, the detecting switch 21 is turned on. The internal resistance type multi-cell detecting circuit 2 performs battery detection, so that the first battery unit status signal Sb1, the second battery unit status signal Sb2, the third battery unit status signal Sb3, and the fourth battery unit status signal Sb4 follow The internal resistances of one of the battery cells B1a, the second battery cells B2a, the third battery cells B3a, and the fourth battery cells B4a are changed to reflect whether the battery efficiency state of the corresponding battery cells or the actual chargeable amount is normal. Therefore, if the battery efficiency state or the actual power storage capacity of the corresponding battery unit is abnormal, the corresponding battery unit status signal changes from the normal state to the abnormal state, so that the corresponding light emitting diode emits light to reach the user explicitly. Indicates the battery efficiency condition of the battery unit or the actual stored power is abnormal. In this embodiment, the battery state display unit is implemented by four indicating circuits (25a, 25b, 25c, 25d) including four light emitting elements (LED1, LED2, LED3, LED4), but not limited thereto. In an embodiment, the battery state display unit is implemented in the form of a liquid crystal display panel (LCD panel).

In summary, the internal resistance multi-cell detection circuit of the present invention does not need to use a complicated circuit, but achieves a fast and accurate detection of each battery cell electrically connected in series with a relatively simple and low-cost circuit. The battery efficiency condition prevents the battery pack from providing an unstable voltage due to the incorrect judgment of the battery detection circuit, and prevents the portable electronic device from being damaged due to the inability of the portable electronic device to complete the shutdown procedure. In addition, since the internal resistance type multi-cell unit in the present case detects that the road electric power is a simpler circuit and realizes a lower cost circuit, it can be applied to the battery pack.

In this case, the battery pack with battery detection function can be straightened without additional tools. The battery detection function of the battery pack is used to quickly and accurately detect the battery efficiency condition of each battery unit electrically connected and the actual storage capacity is normal, so as to prevent the battery pack from being unstable due to incorrect judgment of the battery detection circuit. The voltage can prevent the portable electronic device from being damaged due to the failure of the portable electronic device to complete the shutdown process. Each battery unit of the battery pack is designed to be replaceable, and the user can replace only the battery unit with poor battery efficiency without discarding the entire battery pack, thereby reducing the use cost and complying with environmental protection.

This case has been modified by people who are familiar with the technology, but it is not intended to be protected by the scope of the patent application.

2‧‧‧Internal resistance multi-cell detection circuit

21‧‧‧Detection switch

23a~23d‧‧‧first to fourth discharge cells

3‧‧‧System Circuit

22a~22d‧‧‧first to fourth auxiliary circuits

31‧‧‧Power monitoring unit

23a1~23d1‧‧‧first to fourth isolation components

32‧‧‧Display unit

24a~24d‧‧‧first to fourth comparison circuits

R1~R4‧‧‧first to fourth resistor

Vref1~Vref4‧‧‧first to fourth reference voltage

Q1~Q4‧‧‧first to fourth switch

B1a~B4a‧‧‧first to fourth battery cells

Vref1~Vref4‧‧‧first to fourth reference voltage

Rs1~Rs4‧‧‧first to fourth discharge resistors

Vb1~Vb4‧‧‧first to fourth battery cell voltage

S1~S4‧‧‧first to fourth discharge signals

Sb1~Sb4‧‧‧first to fourth battery unit status signals

Vb‧‧‧ series voltage

Claims (12)

An internal resistance type multi-cell detecting circuit for detecting one of the first battery unit and the second battery unit, respectively, comprising: a detecting switch; an auxiliary voltage generating unit for generating a first reference a first discharge unit electrically connected to the first battery unit and the detection switch, wherein the first discharge unit causes the first battery unit to discharge the first discharge unit and generate a first discharge by the detection switch a second discharge unit electrically connected to the second battery unit and the detection switch, wherein the second discharge unit causes the second battery unit to discharge the second discharge unit and generate a second discharge by the detection switch a first comparison circuit electrically connected to the auxiliary voltage generating unit and the first discharge unit for generating a first battery unit status signal according to the first discharge signal; and a second comparison circuit, electrical Connected to the auxiliary voltage generating unit and the second discharging unit for generating a second battery unit status signal according to the second discharging signal; wherein the detecting is Whether the conduction is controlled by a user by pressing the detection switch or by a system circuit, when the detection switch is turned on, the first battery unit and the second battery unit respectively respectively the first discharge unit and the second discharge unit The battery is detected by discharging, and the state of the first battery unit state signal and the state of the second battery unit state signal reflects whether the battery efficiency condition or the actual chargeable capacity of the first battery unit and the second battery unit is normal. The internal resistance multi-cell detecting circuit of claim 1, wherein the first battery unit status signal is a normal state when the battery efficiency condition or the actual stored power of the first battery unit is normal; When the first battery unit has a battery efficiency condition or an actual chargeable amount When the abnormality occurs, the first battery unit status signal is in an abnormal state. The internal resistance type multi-cell detection circuit of claim 1 or 2, further comprising a battery state display unit electrically connected to the first comparison circuit and the second comparison circuit, according to the first The battery unit status signal and the second battery unit status signal indicate whether the battery efficiency status or the actual chargeable capacity of the first battery unit and the second battery unit are normal. The internal resistance multi-cell detecting circuit of claim 3, wherein the battery state display unit is implemented by a liquid crystal display panel or a plurality of light emitting elements. The internal resistance type multi-cell detection circuit of claim 4, wherein the battery state display unit comprises: a first indication circuit electrically connected to the first comparison circuit for using the first battery The unit status signal indicates whether the battery efficiency condition or the actual power storage capacity of the first battery unit is normal; and a second indication circuit electrically connected to the second comparison circuit for displaying the status according to the second battery unit status signal Whether the battery efficiency condition or the actual chargeable capacity of the second battery unit is normal; wherein the first indicating circuit and the second indicating circuit comprise the plurality of light emitting elements, and the first battery is displayed by whether the plurality of light emitting elements emit light Whether the battery efficiency condition or the actual chargeable capacity of the unit or the second battery unit is normal. The internal resistance type multi-cell detecting circuit of the fifth aspect of the invention, wherein the first indicating circuit or the second indicating circuit comprises: a current limiting resistor; and a light emitting diode electrically connected to the Current limiting resistor and the comparison circuit. The internal resistance type multi-cell detection circuit of claim 1, wherein the first discharge unit or the second discharge unit comprises: a discharge resistor; a switch electrically connected in series with the positive and negative electrodes of the first battery unit or the second battery unit; a resistor; and an isolation component, the input side of the isolation component being electrically connected to the detection switch The output side of the isolation component is electrically connected in series with the resistor and then electrically connected to the control terminal of the first switch. When the detection switch is turned on, the switch is turned on to cause the voltage of the first battery unit to pass through the first A switch discharges the first discharge resistor to generate the first discharge signal. The internal resistance multi-cell detection circuit of claim 1, wherein the first comparison circuit compares the first discharge signal with the first reference voltage to generate the first battery unit status signal, the second The comparison circuit compares the second discharge signal with the first reference voltage to generate the second battery unit status signal. The internal resistance multi-cell detecting circuit of claim 1, wherein the auxiliary voltage generating unit further generates a second reference voltage, and the first comparing circuit compares the first discharging signal with the first reference voltage The first battery unit status signal is generated, and the second comparison circuit compares the second discharge signal with the second reference voltage to generate the second battery unit status signal. A battery pack with a battery detecting function, comprising: a first battery unit; a second battery unit electrically connected to the first battery unit; a detecting switch; and a battery state display unit for displaying the first battery Whether the battery efficiency condition of the unit and the second battery unit is normal; and an internal resistance multi-cell detecting circuit for detecting the battery efficiency status of the first battery unit and the second battery unit, respectively, comprising: An auxiliary voltage generating unit for generating a reference voltage; a first discharging unit electrically connected to the first battery unit for causing the first battery unit to selectively discharge the first discharging unit and generate a a first discharge signal; a second discharge unit electrically connected to the second battery unit, wherein the second battery unit selectively discharges the second discharge unit and generates a second discharge signal; a comparison circuit electrically connecting the first discharge unit, the battery state display unit and the auxiliary voltage generating unit for comparing the first discharge signal and the reference voltage to generate a first battery unit status signal; and a second a comparison circuit electrically connecting the second discharge unit, the battery state display unit, and the auxiliary voltage generating unit, for comparing the second discharge signal and the reference voltage to generate a second battery unit status signal; wherein the detecting Whether the switch is turned on or controlled by a user by pressing the detection switch or by a system circuit, when the detection switch is turned on, the internal resistance type multi-battery The first detecting unit and the second battery unit respectively discharge the first discharging unit and the second discharging unit to perform battery detection, so that the first battery unit status signal and the second battery unit status signal The state reflects whether the battery efficiency condition or the actual chargeable capacity of the first battery unit and the second battery unit is normal, and the battery state display unit correspondingly displays the battery efficiency of the first battery unit and the second battery unit Is the condition normal? The battery pack with battery detection function according to claim 10, wherein the battery state display unit is implemented by a liquid crystal display panel or a plurality of light emitting elements. The battery pack with a battery detecting function according to claim 10, further comprising: a housing, the first battery unit and the second battery unit are disposed, and the detecting switch is disposed on the housing or a battery state display unit; a cover body combined with the housing for firmly arranging the first battery unit and the second battery unit in the housing; a connector; and a wire extending from one side of the housing to the connector for transmitting the series voltage of the first battery unit and the second battery unit to a portable electronic device or A system circuit of an electrically powered mobile device to provide the electrical energy required for operation.