CN201638904U - rechargeable lithium battery - Google Patents

Abstract

The utility model provides a rechargeable lithium battery for pointed D-type, C-type, AA-type or AAA-type, which includes a power supply device and a shell. The power supply device includes a rechargeable lithium battery cell and a circuit module. The circuit module stabilizes and steps down the voltage output by the rechargeable lithium battery cell to 1.4V to 1.6V and serves as the output voltage of the power supply device, and provides a charging path required for an external power source to charge the rechargeable lithium battery cell. Therefore, the rechargeable lithium battery of the utility model can be used as a 1.5V battery commonly used in general electrical appliances in the consumer market, and can be charged and discharged through the same point without the need to set up a charging interface on the battery body.

Description

rechargeable lithium battery

technical field

The utility model relates to a rechargeable lithium battery, in particular to a pointed D-type, C-type, AA-type or AAA-type rechargeable lithium battery suitable for consumer markets.

Background technique

Generally, the common consumer primary batteries on the market are nothing more than 1.5V dry batteries or alkaline batteries. Although the technology development of this kind of disposable batteries is quite mature, the disposable batteries are discarded when they are used up, which is easy to cause environmental pollution. Moreover, although the price of disposable batteries is low, if the load is placed for a long time, the battery will leak, and even cause damage to the electrical appliances.

In order to effectively solve the problem of environmental protection, a rechargeable secondary battery is gradually developed, such as nickel metal hydride (Ni-MH) or nickel cadmium (Ni-cd) battery, however, due to the characteristics of the material However, this kind of nickel-hydrogen or nickel-cadmium secondary battery can only provide an output voltage of 1.2V. Moreover, for nickel-hydrogen batteries with low self-discharge performance seen on the market, their self-discharge degree is still higher than that of lithium batteries. Battery. Similarly, if the 1.2V rechargeable battery is placed under load for a long time, the battery will leak, and the output voltage of 1.2V is not as good as the 1.5V performance of the primary battery. Therefore, the general 1.2V rechargeable battery still has many impracticalities.

Furthermore, another common secondary battery is a lithium battery. However, the nominal voltage of a single lithium battery cell (cell) is about 3.6V or 3.7V, and cannot be directly supplied to electrical appliances that generally use 1.5V.

Therefore, better secondary batteries are urgently needed for power supply devices.

Contents of the invention

One object of the present invention is to provide a rechargeable lithium battery that can directly use the lithium battery as a pointed D-type, C-type, AA-type or AAA-type battery that is common in the general consumer market.

Another object of the present invention is to provide a rechargeable lithium battery that can be directly charged or discharged by the positive and negative connecting parts.

Another object of the present invention is to provide a rechargeable lithium battery capable of self-protection during charging or discharging. In order to achieve the above purpose or other purposes, the rechargeable lithium battery of the present invention includes: a power supply device and a casing, wherein the power supply device includes: a rechargeable lithium battery cell with a positive terminal and a negative terminal; And a circuit module, the voltage output by the rechargeable lithium battery is stabilized and stepped down to 1.4V-1.6V and used as the output voltage of the power supply device, and an external power supply is required for charging the rechargeable lithium battery. The charging path of the circuit module is electrically connected to the positive terminal and the negative terminal of the rechargeable lithium battery through a positive battery bridge part and a negative battery bridge part respectively; The supply device is fixed inside, and the shell has a positive power connection part and a negative power connection part respectively located at two ends and electrically connected to the power supply device, for the power supply device to charge or discharge.

In one embodiment, the circuit module further includes: a discharge blocking unit, electrically connected to the positive electrode connection part, for blocking the passage of the discharge current and only allowing the passage of the charging current; a protection unit, electrically connected respectively The discharge blocking unit, the positive connecting part, the negative connecting part, the positive cell bridge and the negative cell bridge, the discharge blocking unit is located between the positive connecting part and the protection unit, the protection The unit is used to provide overcharge and overdischarge protection of the rechargeable lithium battery cell, and output a voltage signal in response to the discharge state of the rechargeable lithium battery cell; and a voltage stabilizing unit, electrically connected to the protection unit and the positive electrode respectively The power connection part, the negative power connection part, the positive cell bridging part and the negative cell bridging part are used for performing or stopping voltage regulation and step-down of the output voltage of the rechargeable lithium cell in response to the voltage signal. Wherein, the discharge blocking unit may be a diode.

In one embodiment, the voltage stabilizing unit further includes an overcurrent protection circuit and an overheating protection circuit connected in parallel to provide protection for the voltage stabilizing unit during discharge.

In one embodiment, an insulating sheet is disposed between the positive terminal and the circuit module.

In one embodiment, the casing includes a first casing and a second casing, and the inner ends of the first casing and the second casing each have a The electric part and the multiple grooves of the negative electric connection part.

In one embodiment, the housing includes a metal cylindrical housing, the negative power connection part is located at the bottom and integrally formed with the metal cylindrical case, the positive power connection part is located on the opposite side of the negative power connection part and Engages with the metal cylindrical housing. Wherein, the rechargeable lithium battery further includes a heat-shrinkable film covering the outer surface of the power supply device.

Thus, under the structural arrangement and circuit arrangement of the present utility model, it can solve the non-environmental protection of the general 1.5V dry battery and the impracticality of the general 1.2V rechargeable battery, and make the rechargeable battery of the present utility model Lithium batteries can be used repeatedly for a long time, and the voltage stabilization mechanism and protection mechanism of the battery can avoid the situation that the voltage is too low, cannot be charged, and causes liquid leakage. In addition, the rechargeable lithium battery of the present invention can be charged and discharged through the same point, without having to set up another charging interface on the battery body.

Description of drawings

FIG. 1 is an exploded view of a rechargeable lithium battery in an embodiment of the present invention.

Fig. 2 is a circuit diagram of the circuit module in an embodiment of the present invention.

FIG. 3 is a circuit diagram of a voltage stabilizing unit in an embodiment of the present invention.

FIG. 4 is an exploded view of a rechargeable lithium battery in another embodiment of the present invention.

FIG. 5 is an exploded view of a rechargeable lithium battery in yet another embodiment of the present invention.

[Description of main component symbols]

100 power supply unit

110 rechargeable lithium batteries

112 Positive terminal

114 negative terminal

122 Positive cell bridge

124 Negative cell bridge

120 circuit modules

1210 voltage regulator buck

1212 transistor

1220 controller

1222 amplifier

1224 Schmitt trigger circuit

1230 Overcurrent protection circuit

1240 Overheat protection circuit

150 insulation sheet

200 Shell

202 The first shell

204 Second shell

210 opening

220 storage space

230 Groove

250 Metal cylindrical shell

291 Positive terminal

292 Negative terminal

300 heat shrink film

U1 voltage stabilizing unit

U2 protection unit

C1～C4 capacitor

D1～D6 Diodes

VM Positive output terminal of power supply

VDD power supply positive input terminal

VCC internal circuit power supply input

GND ground terminal

ON/OFF switch terminal

VIN Voltage input terminal

VSS ground terminal

VOUT voltage output terminal

R _s feedback resistor

R _f feedback resistor

V _fb divider voltage

B+, B-, P+ endpoints

Detailed ways

In order to fully understand the purpose, features and effects of the present utility model, the present utility model is described in detail through the following specific embodiments and in conjunction with the accompanying drawings, as follows:

The utility model stabilizes the nominal voltage of a single lithium cell to 1.4V-1.6V for output, preferably 1.5V for output. In addition, the utility model is applicable to the use of D-type, C-type, AA-type or AAA-type batteries batteries in electrical appliances. The utility model is applied to consumer batteries, that is, pointed D-type, C-type, AA-type or AAA-type batteries, that is, the positive contact part is a protruding contact, and the negative contact part is a flat contact; the other This type of industrial battery is a flat D-type, C-type, AA-type and AAA-type battery, which does not belong to the type of battery used in the consumer market, that is, the positive and negative terminals are flat contacts.

First please refer to FIG. 1 , which is an exploded view of a rechargeable lithium battery in an embodiment of the present invention. The utility model includes a power supply device 100 and a casing 200, the casing 200 is used to accommodate and fix the power supply device 100 inside, and the two ends of the casing 200 further include a positive connection part 291 and a The negative terminal 292 is electrically connected to the power supply device 100 respectively, and provides the positive and negative contacts required for the power supply device to charge or discharge.

The power supply device 100 includes: a rechargeable lithium battery cell 110 and a circuit module 120 . As shown in FIG. 1 , two ends of the rechargeable lithium battery cell 110 respectively have a positive terminal 112 and a negative terminal 114 . The circuit module 120 is electrically connected to the positive end 112 and the negative end 114 through a positive cell bridge portion 122 and a negative cell bridge portion 124 respectively. The positive cell bridge 122 serves as an electrical bridge between the positive terminal 112 and the circuit module 120 , and similarly, the negative battery bridge 124 serves as an electrical bridge between the negative terminal 114 and the circuit module 120 , and the negative electrode cell bridging portion 124 can be made of a metal sheet, such as a nickel sheet. In a preferred embodiment, the negative cell bridging portion 124 extends from the negative end 114, and extends through the side of the rechargeable lithium cell 110 to electrically connect with the circuit module 120, such an arrangement This makes it easier to place the components of the present invention into the housing 200 in the form of a D-, C-, AA- or AAA battery.

The positive connection part 291 is electrically connected to the circuit module 120 ; the negative connection part 292 is electrically connected to the negative cell bridge part 124 . The rechargeable lithium battery of the present utility model can directly charge the rechargeable lithium battery cell 110 through the positive connection part 291 and the negative connection part 292, without additional electrical connection for charging on the battery body. point.

The circuit module 120 is used to stabilize and step down the voltage output by the rechargeable lithium battery cell 110 to 1.4V-1.6V, such as: 1.4V, 1.45V, 1.5V, 1.55V and 1.6V, preferably 1.5V , the voltage drop is used as the output voltage of the power supply device 100 to supply power to an external load through the positive connection part 291 and the negative connection part 292 . Similarly, when the rechargeable lithium battery of the present invention is being charged, the power supply device 100 is charged through the positive connection part 291 and the negative connection part 292 .

Next, please refer to FIG. 2 , which is a circuit diagram of the circuit module in an embodiment of the present invention. The circuit module 120 has a discharge blocking unit D1 , a protection unit U2 and a voltage stabilizing unit U1 . In FIG. 2 , the terminals B+ and B− represent the positive terminal 112 and the negative terminal 114 of the rechargeable lithium battery 110 respectively, and the terminal P+ represents the positive terminal 291 . Wherein, the negative electrode connecting portion 292 is electrically connected to the B-terminal in FIG. 2 .

The protection unit U2 is electrically connected to the discharge blocking unit D1 and the B+/B- and P+ terminals respectively (that is, respectively connected to the positive electrode connecting part 291, the negative electrode connecting part 292, the positive electrode cell bridge part 122 and the negative electrode. The cell bridging portion 124 is electrically connected), and the discharge blocking unit D1 is located between the P+ terminal (ie, the positive connecting portion 291 ) and the protection unit U2.

The voltage stabilizing unit U1 is electrically connected to the discharge blocking unit D1 and the B+/B- and P+ terminals respectively (that is, respectively connected to the positive electrode connecting part 291, the negative electrode connecting part 292, the positive electrode cell bridge part 122 and the The negative cell bridge portion 124 is electrically connected).

The discharge blocking unit D1 is electrically connected to the P+ terminal (that is, the positive connection portion 291 ) for blocking the passage of the discharge current and only allowing the passage of the charging current. In a preferred embodiment, the discharge blocking unit D1 is a diode.

In the discharge state, since the nominal voltage output by the lithium cell unit is about 3.6V or 3.7V, it must be stabilized and lowered by the voltage stabilizing unit U1 to reduce the output to about 1.5V. The utility model can reduce the voltage according to actual needs. Voltage regulation is 1.4V ~ 1.6V. Due to the blocking effect of the discharge blocking unit D1, the nominal voltage of 3.6V or 3.7V will not be output to the P+ terminal (that is, the positive electrode connecting part 291) through the protection unit U2, thereby resulting in the rechargeable lithium battery of the present invention. The battery outputs a high voltage of 3.6V or 3.7V to the outside. However, the protection unit U2 will continuously monitor the voltage of the rechargeable lithium battery 110 (i.e. the voltage difference between B+ and B- terminals), and output a voltage signal to the regulated voltage in response to the discharge state of the rechargeable lithium battery 110 The ON/OFF switch terminal of the unit U1 enables the voltage stabilizing unit U1 to perform or stop stabilizing and stepping down the voltage. For example, when the internal voltage drop of the rechargeable lithium battery cell 110 is not lower than a predetermined value of discharge voltage (usually about 2.5V), the voltage signal can activate the voltage stabilizing unit U1 to stabilize and lower the voltage; Conversely, if the protection unit U2 detects that the rechargeable lithium battery cell 110 has reached the predetermined value of the discharge voltage (lower than the predetermined value of the discharge voltage, it will be over-discharged), the voltage signal can stop the operation of the voltage stabilizing unit U1 , so that it stops voltage regulation and step-down.

In the state of charging, the charging voltage is applied by P+ (i.e., the positive terminal 291), and the charging current will not flow through the voltage stabilizing unit U1, but will pass through the protection unit U2. Therefore, similarly, the protection unit U2 will continue to The internal voltage drop of the rechargeable lithium battery cell 110 is monitored, and when it rises to a preset charging voltage (usually about 4.35V), the charging circuit is disconnected and the charging is stopped. When the external charging source is removed, the internal voltage drop of the rechargeable lithium battery cell 110 has exceeded the preset discharge voltage value (about 2.5V), so the voltage signal sent by the protection unit U2 can trigger the voltage stabilizing unit U1, Make the voltage regulation and step-down again.

Therefore, the protection unit U2 prevents the voltage/current overload of the rechargeable lithium battery cell 110 during charging or discharging. The circuit design of the protection unit U2 is a conventional overvoltage/overcurrent protection design, and its protection function can be The adjustment is made according to the actual situation (the setting of the predetermined value of the discharging and charging voltage), so it will not be repeated here.

Next, please refer to FIG. 3 , which is a circuit diagram of the voltage stabilizing unit in an embodiment of the present invention. The ON/OFF circuit controls the conduction or disconnection according to the input voltage signal, and the reference voltage circuit provides the voltage drop comparison of the voltage input terminal VIN, and then through the voltage stabilization circuit, the output voltage drop of the voltage output terminal VOUT to the ground terminal is 1.4. V˜1.6V, which is achieved through a voltage regulator 1210 . In the voltage regulator 1210, an amplifier 1222 compares the divided voltage Vfb generated by the voltage dividing resistor formed by the feedback resistors _Rs and _Rf with a reference voltage generated by a controller 1220 to determine the timing of turning on the transistor 1212, and then The voltage is stabilized and lowered, so that the rechargeable lithium battery of the utility model can stably output a voltage of 1.4V-1.6V. In addition, the voltage stabilizing unit U1 may further include an overcurrent protection circuit 1230 and an overheating protection circuit 1240 connected in parallel to provide protection for the voltage stabilizing unit U1 during discharge, and to monitor whether the entire circuit operates stably.

Next please refer to FIG. 4 , which is an exploded view of the rechargeable lithium battery in another embodiment of the present invention. The casing 200 has a hollow accommodating space 220 therein for accommodating the power supply device 100 . In a preferred embodiment, the casing 200 includes a first casing 202 and a second casing 204, and the two ends of the first casing 202 and the second casing 204 each have a A plurality of grooves 230 for the power supply device. The grooves 230 cooperate with the rechargeable lithium battery cell 110 , the positive connection part 291 and the negative connection part 292 to fix the power supply device 100 therein. In a preferred embodiment, in order to ensure the stable operation of the circuit and/or electrical components on the circuit module 120, an insulating sheet 150 is provided between the positive terminal 112 and the circuit module 120 to prevent the circuit module from A short circuit occurs between 120 and the positive terminal 112. Wherein, the outer surface of the casing 200 can be covered with a heat shrinkable film 300 to stabilize the casing 200 so that it is not easy to be disassembled or separated.

Next, please refer to FIG. 5 , which is an exploded view of the rechargeable lithium battery in another embodiment of the present invention. The casing includes a metal cylindrical casing 250, the negative electrode connecting part 292 is located at the bottom of the metal cylindrical casing 250 and integrally formed with the metal cylindrical casing 250, the positive electrode connecting part 291 is located at the negative electrode connecting part. The opposite side of the electric part 292 is connected with the metal cylindrical shell 250, and the metal cylindrical shell 250 is preferably a steel shell. Wherein, the rechargeable lithium battery of the present invention may further include a heat shrinkable film 300 covering the outer surface of the power supply device 100 .

In summary, the rechargeable lithium battery of the present utility model has protection due to the rechargeable lithium battery (containing lithium ion, lithium polymer polymer, lithium manganese, lithium cobalt and lithium iron, etc.) device made of relevant lithium elements. The combination of the unit and the voltage stabilizing unit prevents damage to the battery caused by overcharging, overdischarging or overcurrent, and can stably output a voltage (1.4V ~ 1.6V) that can be used by general electrical appliances. The pointed D-type, C-type, AA-type or AAA-type battery with lithium battery is original (there is no pointed D-type, C-type, AA-type or AAA-type rechargeable battery with lithium battery on the market) , environmental protection (higher cycle charge and discharge times and extremely low memory effect), safety (protection on the circuit), practicality (up to 1.5V output voltage) and convenience (extremely low self-discharge rate and weight reduction).

The utility model has been provided above with preferred embodiments, but those skilled in the art should understand that this embodiment is only used to describe the utility model, and should not be interpreted as limiting the scope of the utility model. It should be noted that all changes and replacements equivalent to this embodiment should be included in the scope of the present utility model. Therefore, the protection scope of the present utility model shall be determined by the scope defined in the claims.

Claims (10)

1. A rechargeable lithium battery, which is applied to one of the four types of pointed D-type, C-type, AA-type or AAA-type batteries, and is characterized in that it comprises: A power supply device comprising: A rechargeable lithium cell having a positive terminal and a negative terminal; and A circuit module, which stabilizes and lowers the voltage output by the rechargeable lithium battery cell to 1.4V-1.6V and serves as the output voltage of the power supply device, and provides the external power supply required for charging the rechargeable lithium battery cell. a charging path, the circuit module is electrically connected to the positive terminal and the negative terminal of the rechargeable lithium battery respectively through a positive battery bridge part and a negative battery bridge part; and A casing, the power supply device is fixed in it, and the casing has a positive power connection part and a negative power connection part respectively located at two ends and electrically connected to the power supply device, for the power supply device to charge or discharge. 2 . The rechargeable lithium battery according to claim 1 , wherein the circuit module stabilizes and lowers the voltage output by the rechargeable lithium battery cell to 1.5V. 3. The rechargeable lithium battery as claimed in claim 1, wherein the circuit module further comprises: A discharge blocking unit, electrically connected to the positive electrode connection part, used to block the passage of discharge current and only allow the passage of charging current; A protection unit, electrically connected to the discharge blocking unit, the positive connection part, the negative connection part, the positive cell bridge part and the negative cell bridge, the discharge blocking unit is located between the positive connection part and the negative connection part Between the protection units, the protection unit is used to provide overcharge and overdischarge protection of the rechargeable lithium battery cell, and output a voltage signal in response to the discharge state of the rechargeable lithium battery cell; and A voltage stabilizing unit, electrically connected to the protection unit, the positive connection part, the negative connection part, the positive cell bridge part and the negative cell bridge part, for responding to the voltage signal to the rechargeable The voltage output by the lithium battery cell performs or stops voltage regulation and step-down. 4. The rechargeable lithium battery as claimed in claim 3, wherein the discharge blocking unit is a diode. 5. The rechargeable lithium battery as claimed in claim 3, wherein the voltage stabilizing unit further comprises an overcurrent protection circuit and an overheating protection circuit connected in parallel to provide protection for the voltage stabilizing unit during discharge. . 6. The rechargeable lithium battery as claimed in claim 4, wherein the voltage stabilizing unit further comprises an overcurrent protection circuit and an overheating protection circuit connected in parallel to provide protection for the voltage stabilizing unit during discharge. . 7. The rechargeable lithium battery according to any one of claims 1-6, wherein an insulating sheet is disposed between the positive terminal and the circuit module. 8. The rechargeable lithium battery as claimed in claim 7, wherein the housing comprises a first housing and a second housing, and the inner ends of the first housing and the second housing are respectively There are a plurality of grooves for fixing the power supply device, the positive power connection part and the negative power connection part. 9. The rechargeable lithium battery according to any one of claims 1 to 6, wherein the casing comprises a metal cylindrical casing, the negative electrode connection part is located at the bottom and integrally formed with the metal cylindrical casing , the positive electrode connection part is located on the opposite side of the negative electrode connection part and is engaged with the metal cylindrical shell. 10. The rechargeable lithium battery as claimed in claim 9, further comprising a heat-shrinkable film covering the outer surface of the power supply device.

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