JPH07501650A - Battery with protection circuit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Battery with protection circuit Technical field TECHNICAL FIELD The present invention relates to batteries, and more particularly to batteries with current limiting protection.

Background technique Rechargeable batteries that can withstand a high number of recharge cycles are safe and reliable. Widely used in Votaple wireless applications that require a high energy source. part Portable applications, especially in communication equipment, have high power requirements and size limitations that make it difficult to High energy batteries are required. For further output power requirements of these devices. In response, new cell technologies are constantly being developed. Some of these new technologies are Requires a fixed charging pattern. In other words, using these new technologies, the desired charging Charging the battery at a charge rate other than the charging rate may result in permanent damage to the battery. There is a risk of causing this. These batteries can be used to charge at undesirable charging rates. Electricity may cause gas vapor deposition, which may lead to an explosion. Reduce cell damage The method is to use dedicated chargers for each cell type. Dedicated charger There are clearly some problems with this: high cost, unnecessary increase in quantity. Large, maintenance and storage are some of them. Batteries using these new cell technologies It would be desirable for the battery to be able to provide the desired additional power without significantly increasing the size.

Therefore, for batteries that can take advantage of new cell technology without the need for a dedicated charger, The necessity is recognized.

Demonstration of invention In summary, the present invention has a cell, the charging pattern of the cell is set in a predetermined manner. A battery device is provided having means for inducing compliance with the formula.

In another aspect of the invention, the battery device is configured such that the battery has a charging rate below a predetermined charging rate. and inhibitor means for inhibiting the battery from being charged at a rate that

Brief description of the drawing FIG. 1 shows a battery according to the invention combined with a charger.

FIG. 2 is a circuit diagram of a protection circuit according to the invention.

FIG. 3 is a block diagram of a receiver according to the invention.

BEST MODE FOR CARRYING OUT THE INVENTION Referring to FIG. 1, a block coupling charger 102 with battery pack 104 Show the diagram. The power generated by charger 102 is transmitted through two power lines 106, 108. is coupled to battery pack 104 via. The latter power line connects the charger 102 and battery bank 104. functions as Inside the battery pack 104 there is at least one cell 1 14, which has a cell capacity (C) and is connected to the power line 10 through a protection circuit 116. Combined with 6. Protection circuit 116 protects battery pack 104 from interference. Provide data means. Cell 114 may be of the nickel metal hybrid type. is desirable. As known in the art, these battery cells The battery cannot be safely charged below the charging rate. Specifically, in order to prevent damage, It has been determined that charging rates below 3C must be avoided. protection circuit 116 prevents the rate at which cell 114 is charged from falling below a predetermined level.

In the preferred embodiment, this minimum charging rate is set to the cell capacity (C). other centers Other charging rates can also be used to adapt the battery to charging rate limits. actual , the protection circuit 116 conforms the desired charging pattern of the cell 114 to a certain charging pattern. may include a circuit that instructs the user to That is, battery bank 1 04 includes a circuit that induces the charging pattern of the cell 114 to follow a predetermined format. can be included. This latter circuit, when following a predetermined charging pattern, Suitable for applications where battery cells are optimally charged.

The battery pack 104 also includes a thermistor 1i2, and the thermistor 1i2. 12 monitors the temperature of the cell 114 during chargeup. used to.

Thermistor 112 is energized by the heat that may result from fast charging of the battery. Provides additional protection against damage caused. The thermistor 112 is Upon request, the temperature of the cell 114 is communicated to the charger 102.

Charger 102 is a general purpose charger. Universal charger can charge a variety of batteries Known for its flexibility. Generally, generic chargers have similar but different packaging. It is intended to charge batteries using different technologies. These chargers are Reduces the number of chargers required to charge the various batteries used by users and highly desirable. General-purpose chargers generally support the various types of batteries that may be charged. A protection circuit 116 is required to prevent damage to the battery. charger, In particular, the operation of universal chargers is well known in the art. Battery placed in charger 102 First, its internal temperature is evaluated. If the temperature is within the given range, Chargers often use a current source to initiate fast charging of a battery. Battery Fast charging is periodically interrupted due to temperature measurements. In fact, it determines the charging rate is the temperature level of the battery or the rate of temperature rise of the battery.

Trickle charge state as soon as the battery temperature is determined to be above the appropriate level for fast charging Enter (Trickle charge 5tate).

The protection circuit 116 switches from fast charging to trickle charging if a trickle charging rate is applied. is used to prevent battery pack 104 from being charged.

Referring to FIG. 2, a circuit diagram of a preferred embodiment of protection circuit 116 is shown. Charging input terminal 118 is a resistor formed by Zener diode 210 and resistor 222. branched to the controller. Input terminal 118 is also coupled to the anode of 5CR204. Ru. The cathode of 5CR 204 is coupled to the positive terminal of cell 114. 5CR204 game The gate is coupled to two switching transistors 208,220. the latter The base of transistor 220 is connected to resistor 222 through diodes 216 and 218. is combined with The base of transistor 208 is connected to the transistor through resistor 214. 220 collector. by charger 102 at input terminal 118. The fast charging provided by transistor 22 via diodes 216 and 218 Turn on 0. As a result, the base of transistor 208 connects to resistor 214 and O Since the transistor 220 is connected to ground through the N transistor 220, the transistor 2 08 is turned on. Also, a high voltage of 5 Since the voltage is applied to the gate of CR204, 5CR204 is turned ON. Next, 5C R204 sends high-speed light to cell 114! Provides IL current. Charging of cell 114 continues At the same time, regular temperature checks are carried out.

As cell 114 reaches full charge, the temperature increase transferred to charger 102 causes Fast charging is then stopped and replaced with trickle charging. In trickle charging mode, The current provided by charger 102 is sufficient to turn transistor 220 ON. An insufficient voltage develops across resistor 222. As a result, transistors 208 and and 5CR204 are not turned on, and the low current rate prevents trickle charging of cell 114. prevent. A charging rate below the desired level (in this case the IC) will cause the cell 114 to charge. It is clear that electricity can be blocked, thereby preventing damage. transistor 2 Number of supporting components of 08,220 By changing the value, other charging rates can be prevented from charging the cell 114. Ru.

Circuit 116 illustrates the principles of the invention in the context of one particular battery cell. It is something. Other cells with different characteristics may require different charging patterns. This charging pattern can be satisfied by different protection circuits.

The elements of circuit 116 shown herein are not intended to directly or indirectly limit the invention. It's not something to taste.

In summary, protection circuit 116 is used to ensure that cell 114 is only charged in fast mode. make it possible to do so. Circuit 116 indicates that fast charging is stopped and replaced with trickle charging. In this case, the current path from the charger 102 to the charging cell 114 is cut off.

Protection circuit 116 protects cell 114 from potential damage caused by trickle charging. protects against certain damage and overcomes the shortcomings of prior art battery packages .

Referring to FIG. 3, a block diagram of the communication device is shown. radio frequency signal antenna 302 and is received by receiver 304 . Receiver 304 and communication device Other elements of 300 are powered via battery 104.

The audible signal received and decoded by receiver 304 is transmitted through speaker 308. provided. On the other hand, the data signal is displayed via the display terminal 306. each Specified batteries may include a protection circuit 116 to prevent them from being trickle charged. During this period, it can be used together with the communication device 300. With the above battery, various A single charger can be used to support the battery; no need to have multiple chargers Gender disappears.

Figure 1 Figure 3 Figure 2

Claims (10)

[Claims] 1. A battery device comprising: at least one cell having a cell capacity; and said at least one cell comprising: an inhibitor means for suppressing charging at a rate below a predetermined charging rate; A battery device comprising: 2. wherein the at least one cell includes a nickel metal hybrid. The battery device according to claim 1. 3. The inhibitor means is configured such that the at least one cell has a capacity of 3/3 of the cell capacity. Claim 1, characterized in that charging at a charging rate lower than 1 is suppressed. battery device. 4. The inhibitor means is configured such that the at least one cell has a capacity equal to the cell capacity. The charger is characterized in that it includes means for suppressing charging at a rate lower than the desired charging rate. The battery device according to claim 1. 5. A nickel metal hybrid battery device comprising: cell capacity and charging at least one cell having a turn; and the charging pattern prevents the at least one cell from being trickle charged; A nickel metal hive characterized by comprising: means for inducing Lid battery device. 6. The induction means induces the battery to be charged with the cell capacity. 6. The battery device according to claim 5, further comprising means for determining. 7. A nickel-metal hybrid battery device comprising: a small battery having a cell capacity; at least one nickel metal cell; and means for preventing said at least one cell from being trickle charged; A nickel-metal hybrid battery device characterized by comprising: . 8. 8. The nickel metal alloy according to claim 7, further comprising a thermistor. Ibrid Battery. 9. A communication device that: Receiving machine; A battery device comprising: at least one cell having a cell capacity; and said at least one cell comprising: an inhibitor means for inhibiting charging at a rate below a predetermined charging rate; Terry device; A communication device comprising: 10. The inhibitor means causes the at least one cell to reduce the cell capacity. Claim 9, characterized in that it includes means for suppressing charging at a charging rate that is Communication equipment on board.