Activation circuit, battery protection device and battery

Abstract

The utility model discloses an activation circuit, a battery protection device and a battery, the activation circuit comprises a battery protection chip, an activation circuit and an activation terminal, the activation circuit comprises a diode, a first resistor, a second resistor, a thermistor, a protection branch and a switch element, one end of the activation terminal is connected with one end of the diode, and the other end of the activation terminal is connected with the second resistor. The other end of the diode is connected with the other end of the first resistor, one end of the first resistor is connected with the first end of the switch element, one end of the second resistor is connected with the first end of the switch element, the thermistor is connected with the second end of the switch element, and the battery protection chip is connected with the third end of the switch element through the protection branch. According to the activation circuit, the battery activation enabling function can be newly added on a large number of battery protection chips without the battery activation enabling function, and the universality of the battery activation enabling function is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a kind of activation circuit, battery protection device and battery. BACKGROUND

[0002] Lithium battery protection chip is the key component of guaranteeing lithium battery safe operation. It is mainly used to monitor and control the charging and discharging process of lithium battery, prevent overcharge, overdischarge, overcurrent and short circuit phenomenon, so as to protect the battery from damage, prolong the battery life, and ensure user safety.

[0003] The CW12X4 series battery protection chip widely used in the current market is long output under conventional application, that is, it is always in an enabled state, and there is a risk of electric shock in multi-string battery application. Moreover, the battery is activated by default, and the power consumption is also at the maximum power consumption. UTILITY MODEL CONTENT

[0004] The utility model provides a kind of activation circuit, battery protection device and battery to solve the technical problem that battery voltage is always in an enabled state under the application of battery protection chip in prior art, leading to the performance reduction of battery.

[0005] In order to achieve the above purpose, the utility model provides an activation circuit, which comprises a battery protection chip, an activation circuit and an activation terminal, wherein,

[0006] The activation circuit comprises a diode, a first resistor, a second resistor, a thermistor, a protection branch and a switching element.

[0007] One end of the activation terminal is connected to one end of the diode, the other end of the diode is connected to the other end of the first resistor, one end of the first resistor is connected to the first end of the switching element, and one end of the second resistor is connected to the first end of the switching element.

[0008] The thermistor is connected to the second end of the switching element, and the battery protection chip is connected to the third end of the switching element through the protection branch.

[0009] In a possible implementation manner of the first aspect, the protection branch comprises a third resistor, a fourth resistor and a fifth resistor, and the third resistor, the fourth resistor and the fifth resistor are connected in series.

[0010] In a possible implementation manner of the first aspect, the battery protection chip comprises at least a first pin, a second pin and a third pin, wherein,

[0011] The third resistor is connected to the first pin for discharge protection.

[0012] The fourth resistor is connected to the second pin for high-temperature charging protection.

[0013] The fifth resistor is connected with the third pin for charging low temperature protection.

[0014] In a possible implementation of the first aspect, the first end of the switching element is a gate, the second end of the switching element is a source, and the third end of the switching element is a drain.

[0015] In a possible implementation of the first aspect, the switching element is an N-channel metal oxide semiconductor field effect transistor.

[0016] In a possible implementation of the first aspect, the other end of the activation terminal is short-circuited with the positive electrode of the battery through a wire for turning on the switching element.

[0017] In a possible implementation of the first aspect, when the other end of the activation terminal is left open, the resistance between the second end and the third end of the switching element is in the order of megaohm.

[0018] The second aspect of the embodiment of the utility model provides a battery protection device, the battery protection device includes the activation circuit of the first aspect.

[0019] The third aspect of the embodiment of the utility model provides a battery, the battery protection device includes the activation circuit of the first aspect, or the battery protection device like the second aspect.

[0020] The utility model technical scheme has the following advantages:

[0021] The activation circuit provided by the embodiment of the utility model, including battery protection chip, activation circuit and activation terminal, wherein, the activation circuit includes diode, first resistance, second resistance, thermistor, protection branch and switching element, one end of the activation terminal is connected with one end of the diode, the other end of the diode is connected with the other end of the first resistance, one end of the first resistance is connected with the first end of the switching element, one end of the second resistance is connected with the first end of the switching element, the thermistor is connected with the second end of the switching element, the battery protection chip is connected with the third end of the switching element through the protection branch, the activation circuit can realize the new battery activation enabling function on a large number of battery protection chips without battery activation enabling function, and the safety of the battery and the battery storage time are improved. DRAWINGS

[0022] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0023] Figure 1 The circuit structure connection diagram of the activation circuit in the embodiment of the utility model;

[0024] Wherein, the reference signs of the drawings of the drawings are as follows: ACT1-activation terminal; D9-diode; R44-first resistance; R43-second resistance; NTC1-thermistor; Q8-switching element; R9-third resistance; R10-fourth resistance; R11-fifth resistance; U1-battery protection chip; 1-positive pole pin of the battery protection chip; 21 to 24-hanging pin of the battery protection chip; 2 to 8, 17-other pin of the battery protection chip; 20-first pin; 19-second pin; 18-third pin. DETAILED DESCRIPTION

[0025] The technical scheme in the embodiment of the utility model will be clearly and completely described below in combination with the drawings in the embodiment of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the ordinary skilled in the art without making creative labor belong to the scope of protection of the utility model.

[0026] In the description of the utility model, it needs to be explained that the terms "first", "second" and "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0027] In the description of the utility model, it needs to be explained that, unless otherwise explicitly specified and limited, the term "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the internal communication of two elements; it can be wireless connection, or wired connection. For the ordinary skilled in the art, the specific meaning of the above-mentioned term in the utility model can be understood according to the specific circumstances.

[0028] Please refer to Figure 1 The circuit structure relationship schematic diagram of one embodiment of the activation circuit provided by the utility model, including the battery protection chip U1, the activation circuit and the activation terminal ACT1, the activation circuit includes the diode D9, the first resistance R43, the second resistance R44, the thermistor NTC1, the protection branch and the switching element Q8;

[0029] One end of the activation terminal ACT1 is connected with one end of the diode D9, the other end of the diode D9 is connected with the other end of the first resistance R43, one end of the first resistance R43 is connected with the first end of the switching element Q8, one end of the second resistance R44 is connected with the first end of the switching element Q8;

[0030] The thermal resistor NTC1 is connected with the second end of the switching element Q8, and the battery protection chip U1 is connected with the third end of the switching element Q8 through the protection branch.

[0031] In the embodiment, the conventional battery voltage default output, the multi-string battery application exists the electric shock risk, the battery default activation, and the power consumption is also in the maximum power consumption. Therefore, by adding the battery activation enabling function on the battery, when the battery activation enabling function is not activated, the battery protection chip U1 is in the open state through the internal switching element Q8, so that the battery cannot output voltage to the outside. Only when the activation signal such as the activation terminal ACT1 is connected with the positive electrode of the battery, the battery protection chip U1 will control the switching element Q8 to close, so that the battery starts to work normally and outputs voltage. Therefore, in the case of not using the battery, the power consumption is reduced, and the safety of the battery and the storage time of the battery are improved. The specific implementation manner is that: an activation circuit is designed, the activation circuit includes the battery protection chip U1, the activation terminal ACT1, the diode D9, the first resistor R43, the second resistor R44, the switching element Q8, the thermal resistor NTC1 and the protection branch, wherein one end of the activation terminal ACT1 is connected with one end of the diode D9, the other end of the diode D9 is connected with the other end of the second resistor R44, one end of the first resistor R43 is connected with the first end of the switching element Q8; the thermal resistor NTC1 is connected with the second end of the switching element Q8, and the battery protection chip U1 is connected with the third end of the switching element Q8 through the protection branch. Through the above connection mode, the battery activation enabling function is added on a large number of battery protection chips U1 without the battery activation enabling function.

[0032] In an embodiment, the protection branch further includes a third resistor R9, a fourth resistor R10 and a fifth resistor R11, and the third resistor R9, the fourth resistor R10 and the fifth resistor R11 are connected in series.

[0033] In the embodiment, the protection branch includes a third resistor R9, a fourth resistor R10 and a fifth resistor R11, and the third resistor R9, the fourth resistor R10 and the fifth resistor R11 are connected in series.

[0034] In an embodiment, the battery protection chip U1 at least includes a first pin 20, a second pin 19 and a third pin 18, wherein the third resistor R9 is connected with the first pin 20, and is used for discharging protection;

[0035] The fourth resistor R10 is connected with the second pin 19, and is used for charging high-temperature protection;

[0036] The fifth resistor R11 is connected with the third pin 18, and is used for charging low-temperature protection.

[0037] In the embodiment, the battery protection chip U1 includes a plurality of pins, wherein the first pin 20, the second pin 19 and the third pin 18 are connected with the third resistor R9, the fourth resistor R10 and the fifth resistor R11 respectively, for circuit protection.

[0038] The positive pin 1 of the battery protection chip U1 is connected with the power supply for power supply of the battery protection chip U1, the pins 2-8, the pins 21-24 and the pin 17 are other pins of the battery protection chip U1, which are suspended. The first pin 20 is connected with the third resistor R9 for discharge protection, the second pin 19 is connected with the fourth resistor R10 for charging high temperature protection, and the third pin 18 is connected with the fifth resistor R11 for charging low temperature protection.

[0039] In an embodiment, the first end of the switch element Q8 is the gate, the second end of the switch element Q8 is the source, and the third end of the switch element Q8 is the drain.

[0040] In the embodiment, one end of the second resistor R44 is connected with the gate of the switch element Q8, and one end of the first resistor R43 is connected with the gate of the switch element Q8; the thermistor NTC1 is connected with the source of the switch element Q8, and the battery protection chip U1 is connected with the drain of the switch element Q8 through the protection branch.

[0041] In an embodiment, the switch element Q8 is an N-channel metal oxide semiconductor field effect transistor.

[0042] In the embodiment, the switch element Q8 is an N-channel metal oxide semiconductor field effect transistor, i.e. NMOS, which can be turned on when the activation terminal ACT1 is short-circuited with the positive pole of the battery.

[0043] In an embodiment, the other end of the activation terminal ACT1 is short-circuited with the positive pole of the battery through a wire, for turning on the switch element Q8.

[0044] In the embodiment, as shown in Figure 1 When the battery is installed in the whole machine, the activation terminal ACT1 is short-circuited with the positive pole of the battery, at this time the battery voltage makes the switch element Q8 conductive, allowing current to pass through, and at the same time the thermistor NTC1 detects the temperature, if the temperature detection is normal at this time, the battery voltage is normally output. If the temperature detection is not normal, the protection state is entered.

[0045] Specifically, when the battery is discharging, if the voltage across the third resistor R9 is lower than the set value, the monitoring circuit can trigger the protection mechanism, such as cutting off the discharge circuit, to prevent the battery from over-discharging;

[0046] When the battery is charging, if the fourth resistance R10 changes, the thermistor NTC1 detects the temperature rise in the battery circuit, and triggers the temperature protection, such as cutting off the charging circuit;

[0047] When the battery is charging, if the fifth resistance R11 changes, the thermistor NTC1 detects the temperature drop in the battery circuit, and triggers the temperature protection, such as stopping charging or adjusting the charging strategy.

[0048] In an embodiment, when the other end of the activation terminal ACT1 is suspended, the resistance between the two ends of the switch element Q8 is in the order of megaohm.

[0049] In the embodiment, when the battery is in the process of transportation, storage, etc., the activation terminal ACT1 is suspended, at this time, the first resistance R43 closes the switch element Q8, and the resistance of the switch element Q8 is in the order of megaohm. The resistance is much larger than the above-mentioned specific resistance, corresponding to very low temperature, at this time, the battery protection chip U1 triggers the low temperature protection. When the charging and discharging switch element Q8 is closed, the battery voltage stops outputting.

[0050] In an embodiment of the present application, a battery protection device is provided, which comprises the activation circuit in the embodiment of the present application, and the implementation principle and technical effects thereof are similar to those of the above-mentioned method embodiment, which will not be described herein again.

[0051] In an embodiment of the present application, a battery is provided, which comprises the activation circuit in the embodiment of the present application, and the implementation principle and technical effects thereof are similar to those of the above-mentioned method embodiment, which will not be described herein again.

[0052] The battery protection chip U1, the activation circuit and the activation circuit of the activation terminal ACT1 provided by the utility model can be applied in the fields of floor cleaning machines, dust collectors, electric tools, electric bicycles, backup power sources, lithium ion and lithium polymer battery packs, etc., and realize the addition of the battery activation enabling function on a large number of battery protection chips without the battery activation enabling function, thereby improving the universality of the battery activation enabling function.

[0053] The above-mentioned specific embodiments further specifically describe the purpose, technical scheme and beneficial effects of the utility model, and it should be understood that the above-mentioned specific embodiments are only specific embodiments of the utility model, and are not used for limiting the protection scope of the utility model. It is particularly pointed out that, for those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. An activation circuit, characterized by The battery protection device comprises a battery protection chip, an activation circuit and an activation terminal, wherein, the activation circuit comprises a diode, a first resistor, a second resistor, a thermistor, a protection branch and a switching element; one end of the activation terminal is connected with one end of the diode, the other end of the diode is connected with the other end of the first resistor, one end of the first resistor is connected with the first end of the switching element, one end of the second resistor is connected with the first end of the switching element; the thermistor is connected with the second end of the switching element, and the battery protection chip is connected with the third end of the switching element through the protection branch.

2. The activation circuit of claim 1, wherein, the protection branch comprises a third resistor, a fourth resistor and a fifth resistor, and the third resistor, the fourth resistor and the fifth resistor are connected in series.

3. The activation circuit of claim 2, wherein, the battery protection chip comprises at least a first pin, a second pin and a third pin, wherein, the third resistor is connected with the first pin for discharging protection; the fourth resistor is connected with the second pin for charging high-temperature protection; the fifth resistor is connected with the third pin for charging low-temperature protection.

4. The activation circuit of claim 1, wherein, the first end of the switching element is a gate, the second end of the switching element is a source, and the third end of the switching element is a drain.

5. The activation circuit of claim 1, wherein, the switching element is an N-channel metal oxide semiconductor field effect transistor.

6. The activation circuit of claim 1, wherein, the other end of the activation terminal is short-circuited with the positive electrode of the battery through a wire for turning on the switching element.

7. The activation circuit of claim 1, wherein, when the other end of the activation terminal is suspended, the resistance value between the second end and the third end of the switching element is in the order of mega-ohm.

8. A battery protection device, characterized by the battery protection device comprises the activation circuit of any one of claims 1-7.

9. A battery, characterized by the battery comprises the activation circuit of any one of claims 1-7 or the battery protection device of claim 8.

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