CN208368568U

CN208368568U - A kind of battery pack and electrical equipment

Info

Publication number: CN208368568U
Application number: CN201820817951.1U
Authority: CN
Inventors: 王雷雨; 朱昊
Original assignee: Beijing Mobai Technology Co Ltd
Current assignee: Hanhai Information Technology Shanghai Co Ltd
Priority date: 2018-05-29
Filing date: 2018-05-29
Publication date: 2019-01-11
Anticipated expiration: 2028-05-29

Abstract

The utility model discloses a kind of battery pack and electrical equipment, which includes battery core, protective switch and the detection circuit of setting inside the shell, and the first contact, the second contact, cathode contact and the cathode contact that are exposed to outside shell；Battery core forms the current supply circuit to power supply for electrical equipment by cathode contact and cathode contact, and protective switch is arranged on current supply circuit；The connection of the anode or cathode of first contact and battery core；Second contact is connect with detection circuit；Detection circuit is arranged to according to the on state between the first contact and the second contact, output switch control signal to protective switch, and switch control signal is used to control the switch state of protective switch.The battery pack of the utility model can provide hardware foundation to cut off the implementation of battery core current supply circuit when battery pack immersion.

Description

Battery package and consumer

Technical Field

The utility model relates to a circuit design technical field, more specifically, the utility model relates to a battery package and consumer.

Background

Existing battery packs typically include a cell and a protection circuit disposed within a housing, and positive and negative contacts exposed outside the housing. The battery core supplies power to the electric equipment through the positive contact and the negative contact. The protection circuit comprises a protection switch, and the protection switch is connected to a loop of the battery cell for supplying power to the positive contact and the negative contact. Through the protection circuit, the protection functions of over-discharge protection, over-charge protection, over-current protection, over-temperature protection and the like of the battery pack can be realized.

However, for the existing electric devices such as bicycles, electric automobiles, etc., the user may use the electric device in rainy days or the electric device may be immersed in water, so that the battery pack is immersed in water.

The existing waterproof protection scheme of the battery pack is to wrap a battery core and a protection circuit in a shell with a waterproof effect, but a positive contact and a negative contact are always exposed outside. If the battery pack is soaked in water, the positive contact and the negative contact are corroded and melted along with electrophoresis, and water enters the battery pack. Therefore, the short circuit of the battery cell can be caused, the service life of the battery cell is shortened, or the battery cell is damaged, and even a fire disaster can be caused, so that the life and property safety of a user are damaged.

SUMMERY OF THE UTILITY MODEL

It is an object of the present invention to provide a new solution that solves one of the above mentioned problems.

According to a first aspect of the present invention, there is provided a battery pack, comprising an electric core, a protection switch and a detection circuit arranged in a casing of the battery pack, and a first contact, a second contact, a positive contact and a negative contact exposed outside the casing; the battery cell forms a power supply loop for supplying power to electric equipment through the positive contact and the negative contact, and the protection switch is arranged on the power supply loop; the first contact is connected with the positive electrode or the negative electrode of the battery cell; the second contact is connected with the detection circuit; the detection circuit is configured to output a switch control signal to the protection switch according to a conduction state between the first contact and the second contact, the switch control signal being used to control a switching state of the protection switch.

Optionally, the first contact is connected to a negative electrode of the battery cell; the detection circuit comprises a first comparator, a first resistor, a second resistor and a third resistor; the second contact is connected with the positive electrode of the battery cell through the first resistor; the second resistor and the third resistor are connected in series between the positive electrode and the negative electrode of the battery cell, and a potential point between the second resistor and the third resistor is connected with a first input end of the first comparator; a second input end of the first comparator is connected with the second contact; and the output end of the first comparator is connected with the control end of the protection switch.

Optionally, the first input terminal of the first comparator is a non-inverting input terminal, the second input terminal of the first comparator is an inverting input terminal, and the first comparator is configured to output a high level as a switch control signal when the first contact and the second contact are turned on, so as to control the protection switch to be turned off;

or,

the first comparator is configured to output a low level as a switch control signal when the first contact and the second contact are turned on, so as to control the protection switch to be turned off.

Optionally, the first contact is connected with the positive electrode of the battery cell; the detection circuit comprises a second comparator, a fourth resistor, a fifth resistor and a sixth resistor; the second contact is connected with the negative electrode of the battery cell through the fourth resistor; the fifth resistor and the sixth resistor are connected in series between the positive electrode and the negative electrode of the battery cell, and a potential point between the fifth resistor and the sixth resistor is connected with the first input end of the second comparator; a second input end of the second comparator is connected with the second contact; and the output end of the second comparator is connected with the control end of the protection switch.

Optionally, the first input terminal of the second comparator is a non-inverting input terminal, the second input terminal of the second comparator is an inverting input terminal, and the second comparator is configured to output a low level as a switch control signal when the first contact and the second contact are connected, so as to control the protection switch to be turned off;

or,

the first input end of the second comparator is an inverting input end, the second input end of the second comparator is a non-inverting input end, and the second comparator is set to output a high level as a switch control signal under the condition that the first contact and the second contact are conducted so as to control the protection switch to be switched off.

Optionally, the detection circuit includes a processor chip, the second contact is connected to a first pin of the processor chip, and the control end of the protection switch is connected to a second pin of the processor chip

Optionally, the first pin is a general input/output pin or an analog-to-digital conversion pin, and the second pin is a general input/output pin.

Optionally, the protection switch is a field effect transistor.

Optionally, the protection switch is connected between the positive electrode of the battery cell and the positive electrode contact, the switch control signal received by the protection switch is disconnected when the switch control signal is at a high level, the protection switch is provided for a P-channel field effect transistor, a source electrode of the P-channel field effect transistor is connected with the positive electrode of the battery cell, a drain electrode of the P-channel field effect transistor is connected with the positive electrode contact, and a gate electrode of the P-channel field effect transistor is connected with the detection circuit;

or,

the protection switch is connected between the negative electrode of the battery cell and the negative electrode contact, the switch control signal received by the protection switch is disconnected when the switch control signal is at a low level, the protection switch is an N-channel field effect transistor, a source electrode of the N-channel field effect transistor is connected with the negative electrode of the battery cell, a drain electrode of the N-channel field effect transistor is connected with the negative electrode contact, and a grid electrode of the N-channel field effect transistor is connected with the detection circuit.

According to the utility model discloses a second aspect provides a consumer, include according to the utility model discloses the first aspect the battery package.

The beneficial effects of the utility model reside in that, the utility model discloses a battery package can provide the hardware basis for the realization mode that cuts off electric core power supply circuit when the battery package soaks.

Therefore, under the condition that the protection switch is switched on, if the detection circuit detects that the first contact and the second contact are disconnected, the battery pack is not soaked, the protection switch can be continuously controlled to be switched on, so that the power supply loop of the battery core is switched on to supply power to the electric equipment.

Under the condition that protection switch switches on, if detection circuitry detects when switching on between first contact and the second contact, it probably soaks to show the battery package, can control protection switch disconnection, cuts off the power supply circuit of electric core in battery package inside to avoid anodal contact and negative pole contact to produce the electrophoresis, prevent that electric core short circuit from causing the problem emergence of battery package damage.

Under the condition that the protection switch is disconnected, if the detection circuit detects that the first contact and the second contact are disconnected, indicating that the battery pack is immersed in water, the protection switch can be controlled to be switched on again, so that the power supply loop of the battery core is switched on again to continue supplying power to the electric equipment.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.

Fig. 1 is a schematic structural diagram of a battery pack provided by the present invention;

fig. 2 is a schematic circuit diagram of one implementation structure of the battery pack provided by the present invention;

fig. 3 is a schematic circuit diagram of one implementation structure of the battery pack provided by the present invention;

fig. 4 is a schematic circuit diagram of one implementation structure of the battery pack provided by the present invention;

fig. 5 is a schematic circuit diagram of one implementation structure of the battery pack provided by the present invention;

fig. 6 is a schematic circuit diagram of one of the implementation structures of the battery pack provided by the present invention.

Description of reference numerals:

u1: an electric core; u2: a detection circuit;

p1: a first contact; p2: a second contact;

p +: a positive electrode contact; p-: a negative contact;

s1: a protection switch; a1, A2: a comparator;

u21: a processor chip; R1-R6: a resistance;

VCC: the positive electrode of the battery cell; GND: a negative electrode of the battery cell;

q1: a PMOS tube; q2: an NMOS tube;

p3, P4: a potential point; 100: a battery pack.

Detailed Description

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In order to solve the problem of short circuit of a battery cell caused by conduction of a positive contact and a negative contact of a battery pack under the condition that the battery pack in the prior art is soaked, the battery pack is provided. As shown in fig. 1, the battery pack 100 includes a battery cell U1, a protection switch S1, a detection circuit U2, and a first contact P1, a second contact P2, a positive contact P + and a negative contact P-exposed outside the casing. The first contact P1, the second contact P2, the positive contact P + and the negative contact P-are all made of conductive materials, and may be conductive metals, for example. Wherein no electrical connection is made between the first contact P1 and the second contact P2 without external intervention.

In one example, the housing may be waterproof to prevent water from flooding the interior of the battery pack, which may cause damage to the battery pack.

The battery cell U1 supplies power to the electric equipment through the positive contact P + and the negative contact P-. Specifically, the positive electrode VCC of the battery cell U1 may be connected to the positive electrode contact P +, and the negative electrode GND of the battery cell U1 may be connected to the negative electrode contact P-. In this way, the battery cell U1 may form a power supply loop for supplying power to the electrical device through the positive contact P + and the negative contact P-. The power supply loop comprises a connecting path between the positive electrode of the battery cell U1 and the positive electrode contact P +, and a connecting path between the negative electrode GND of the battery cell U1 and the negative electrode contact P-.

A protection switch S1 is provided on the power supply circuit. Specifically, the protection switch S1 may be connected between the positive electrode VCC of the battery cell U1 and the positive electrode contact P +, as shown in fig. 4; alternatively, the protection switch S1 may be connected between the negative electrode GND of the battery cell U1 and the negative electrode contact P —, as shown in fig. 1.

The first contact P1 is connected to the positive terminal VCC of the cell U1, or the first contact P1 is connected to the negative terminal GND of the cell U1. The connection in the embodiment of the present invention includes direct connection and indirect connection, wherein the direct connection may be, for example, that no other element is connected between the first contact P1 and the positive electrode VCC of the battery cell U1, or between the first contact P1 and the negative electrode GND of the battery cell U1, and the connection is only through a wire; the indirect connection may be achieved, for example, by connecting the first contact P1 to the positive electrode VCC of the cell U1, or connecting the first contact P1 to the negative electrode GND of the cell U1 through an element such as a switch.

The second contact P2 is connected to the detection circuit U2. The detection circuit U2 is configured to output a switch control signal to the protection switch S1 according to a conductive state between the first contact P1 and the second contact P2, the switch control signal being used to control a switching state of the protection switch S1. Specifically, the switch control signal is output to the control terminal Ctrl of the protection switch S1, and then the control terminal Ctrl of the protection switch S1 is also connected to the detection circuit U2.

In the case of flooding of the battery pack, the exposed first contact P1 and second contact P2 are flooded, and there is a water connection between the first contact P1 and second contact P2. Since there are mineral ions that can conduct electricity in the water, the water connecting the first contact P1 and the second contact P2 corresponds to a water resistance, and therefore, the first contact P1 and the second contact P2 correspond to an electrical connection through the water resistance. The magnitude of the water resistance is related to the type and amount of impurities in the water and also to the exposed area of the first contact point P1 and the second contact point P2.

In the case where the first contact P1 is connected to the positive electrode VCC of the battery cell U1, if the detection circuit U2 detects that the second contact P2 becomes high, it can be determined that the first contact P1 and the second contact P2 are in conduction, and the first contact P1 and the second contact P2 of the battery pack are immersed in water. In order to protect the battery pack and prevent the short circuit of the battery cell, the detection circuit U2 may output a switch control signal to control the protection switch S1 to open when detecting that the second contact P2 becomes a high level, so as to cut off the power supply loop of the battery cell U1.

In the case where the first contact P1 is connected to the negative GND of the battery cell U1, if the detection circuit U2 detects that the level of the second contact P2 becomes low, it may be determined that the first contact P1 and the second contact P2 are in conduction, and the first contact P1 and the second contact P2 of the battery pack are immersed in water. In order to protect the battery pack and prevent the short circuit of the battery cell, the detection circuit U2 may output a switch control signal to control the protection switch S1 to open when detecting that the second contact P2 becomes a low level, so as to cut off the power supply loop of the battery cell U1.

The utility model discloses a battery package can provide the hardware basis for the realization mode that cuts off electric core power supply circuit when battery package soaks.

If the positive contact P + and the negative contact P-are oxidized, the conductivity of the positive contact P + and the negative contact P-may be affected, and the power supply performance of the battery pack may be affected. If the first and second contacts P1 and P2 are oxidized, the conductivity of the first and second contacts P1 and P2 may be affected, thereby reducing the detection sensitivity of the battery pack in the event of water immersion. Therefore, in one example of the present invention, the surfaces of the first contact P1, the second contact P2, the positive contact P + and the negative contact P-exposed on the housing are all plated with gold. Because gold is inert metal, the surfaces of all the contacts exposed outside the shell are plated with gold, so that the contacts can be effectively prevented from being oxidized in the air and influencing the conductivity of the contacts.

In an example of the present invention, as shown in fig. 2, the first contact P1 is connected to the negative electrode GND of the cell U1. The detection circuit U2 may include a first comparator a1, a first resistor R1, a second resistor R2, and a third resistor R3. The second contact P2 is connected to the positive terminal VCC of the cell U1 via a first resistor R1. The second resistor R2 and the third resistor R3 are connected in series between the positive electrode VCC and the negative electrode GND of the battery cell U1. A potential point P3 between the second resistor R2 and the third resistor R3 is connected to the first input terminal in11 of the first comparator a 1; the second contact P2 is connected to the second input in12 of the first comparator a 1; the output out1 of the first comparator a1 is connected to the control terminal Ctrl of the protection switch S1.

A voltage between the positive electrode VCC and the negative electrode GND of the cell U1 is V1, the second resistor R2 is connected between the positive electrode VCC of the cell U1 and the potential point P3, and the third resistor R3 is connectedThe potential point P3 has a level between the negative GND of the cell U1 and the potential point P3

When the protection switch S1 is turned on when the control terminal Ctrl is inputted with a low level and the protection switch S1 is turned off when the control terminal Ctrl is inputted with a high level, the first input terminal in11 of the first comparator a1 may be a non-inverting input terminal and the second input terminal in12 of the first comparator a1 may be an inverting input terminal. The first comparator a1 is configured to output a high level as a switch control signal in case of conduction between the first contact P1 and the second contact P2 to control the protection switch S1 to be turned off.

Under normal conditions, the first contact P1 and the second contact P2 are open if there is no external influence. Since the first contact P1 is connected to the negative GND of the cell U1 and the second contact P2 is connected to the positive VCC of the cell U1, the first contact P1 is at a low level; the second contact P2 is at a high level, which is equal to the level V1 of the positive VCC of the cell U1. Then, the level of the non-inverting input terminal in11 of the first amplifier a1 isThe level of the inverting input terminal in12 of the first amplifier a1 is V1 because of V1>V3, the output end out1 of the first amplifier a1 outputs a low level, and controls the protection switch S1 to be turned on, so that the power supply loop of the battery cell U1 is turned on.

If the battery pack is soaked in water, the first contact P1 and the second contact P2 are communicated through water, which is equivalent to a water resistor Rw connected between the first contact P1 and the second contact P2. Then, the second contact point P2 will become lowThe water resistance Rw is related to the type and content of impurities in the water and also to the exposed area of the first contact P1 and the second contact P2, and has a size of between 20K Ω and 170K Ω. Through the presetting of the first resistor R1,The resistance values of the second resistor R2 and the third resistor R3 make the level V2 of the inverting input terminal of the first amplifier a1 smaller than the level V3 of the non-inverting input terminal, and the output terminal out1 outputs a high level as a switch control signal to control the protection switch S1 to be switched off, so as to cut off the power supply loop of the battery cell U1.

When the protection switch S1 is turned on when the control terminal Ctrl is inputted with a high level and the protection switch S1 is turned off when the control terminal Ctrl is inputted with a low level, the first input terminal in11 of the first comparator a1 may be an inverting input terminal and the second input terminal in12 of the first comparator a1 may be a non-inverting input terminal. The first comparator a1 is configured to output a low level as a switch control signal in case of conduction between the first contact P1 and the second contact P2 to control the protection switch S1 to be turned off.

Under normal conditions, the first contact P1 and the second contact P2 are open if there is no external influence. Since the first contact P1 is connected to the negative GND of the cell U1 and the second contact P2 is connected to the positive VCC of the cell U1, the first contact P1 is at a low level; the second contact P2 is at a high level, which is equal to the level V1 of the positive VCC of the cell U1. Then, the level of the inverting input terminal in11 of the first amplifier a1 isThe non-inverting input in12 of the first amplifier a1 has a level of V1 because of V1>V3, the output end out1 of the first amplifier a1 outputs a high level, and controls the protection switch S1 to be turned on, so that the power supply loop of the battery cell U1 is turned on.

If the battery pack is soaked in water, the first contact P1 and the second contact P2 are communicated through water, which is equivalent to a water resistor Rw connected between the first contact P1 and the second contact P2. Then, the second contact point P2 will become lowThe water resistance Rw is related to the type and content of impurities in the water and also to the exposed area of the first contact P1 and the second contact P2, and has a size of between 20K Ω and 170K Ω. By pre-treatingThe resistances of the first resistor R1, the second resistor R2, and the third resistor R3 are set first, so that when the level V2 of the non-inverting input terminal of the first amplifier a1 is smaller than the level V3 of the inverting input terminal, the output terminal out1 outputs a low-level switch control signal to control the protection switch S1 to be turned off, and the power supply loop of the battery cell U1 is cut off.

Therefore, through the battery pack of the embodiment, a hardware basis can be provided for the implementation mode of cutting off the battery core power supply loop when the battery pack is soaked in water.

In another example of the present invention, as shown in fig. 3, the first contact P1 is connected to the positive electrode VCC of the battery cell U1. The detection circuit U2 may include a second comparator a2, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6. The second contact P2 is connected to the negative GND of the cell U1 via a fourth resistor R4. The fifth resistor R5 and the sixth resistor R6 are connected in series between the positive electrode VCC and the negative electrode GND of the battery cell U1. A potential point P4 between the fifth resistor R5 and the sixth resistor R6 is connected with a first input terminal in21 of the second comparator A2; the second contact P2 is connected to the second input in22 of the second comparator a 2; the output out2 of the second comparator a2 is connected to the control terminal Ctrl of the protection switch S1.

When the voltage between the positive electrode VCC and the negative electrode GND of the cell U1 is V1, the fifth resistor R5 is connected between the positive electrode VCC of the cell U1 and the potential point P4, and the sixth resistor R6 is connected between the negative electrode GND of the cell U1 and the potential point P4, the level at the potential point P4 is V1

When the control terminal Ctrl inputs a high level, the protection switch S1 is turned on, and when the control terminal Ctrl inputs a low level, the protection switch S1 is turned off, the first input terminal in21 of the second comparator a2 may be a non-inverting input terminal, and the second input terminal in22 may be an inverting input terminal. The second comparator a2 is configured to output a low level as a switch control signal in case of conduction between the first contact P1 and the second contact P2 to control the protection switch S1 to be turned off.

Under normal conditions, the first contact P1 and the second contact P2 are open if there is no external influence. Since the first contact P1 is connected to the positive electrode VCC of the cell U1 and the second contact P2 is connected to the negative electrode GND of the cell U1, the first contact P1 is at a high level; the second contact P2 is at a low level, and the high level is equal to the level 0 of the negative electrode GND of the battery cell U1. Then, the level of the non-inverting input terminal in21 of the second amplifier a2 isThe level of the inverting input terminal in22 of the second amplifier a2 is 0 since V4>0, the output end out2 of the second amplifier a2 will output a high level, and control the protection switch S1 to be turned on, so that the power supply loop of the battery cell U1 is turned on.

If the battery pack is soaked in water, the first contact P1 and the second contact P2 are communicated through water, which is equivalent to a water resistor Rw connected between the first contact P1 and the second contact P2. Then, the second contact point P2 will become high levelThe water resistance Rw is related to the type and content of impurities in the water and also to the exposed area of the first contact P1 and the second contact P2, and has a size of between 20K Ω and 170K Ω. By presetting the resistance values of the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6, when the level V4 of the non-inverting input end of the second amplifier a2 is smaller than the level V2' of the inverting input end of the second amplifier a2, the output end out2 outputs a low level as a switch control signal to control the protection switch S1 to be switched off, so as to cut off the power supply loop of the battery cell U1.

When the control terminal Ctrl inputs a low level, the protection switch S1 is turned on, and when the control terminal Ctrl inputs a high level, the protection switch S1 is turned off, the first input terminal in21 of the second comparator a2 may be an inverting input terminal, and the second input terminal in22 of the second comparator a2 may be a non-inverting input terminal. The second comparator a2 is configured to output a high level as a switch control signal in case of conduction between the first contact P1 and the second contact P2 to control the protection switch S1 to be turned off.

Under normal conditions, the first contact P1 and the second contact P2 are open if there is no external influence. Since the first contact P1 is connected to the positive electrode VCC of the cell U1 and the second contact P2 is connected to the negative electrode GND of the cell U1, the first contact P1 is at a high level; the second contact P2 is at a low level, and the high level is equal to the level 0 of the negative electrode GND of the battery cell U1. Then, the level of the inverting input terminal in21 of the second amplifier a2 isThe level of the non-inverting input in22 of the second amplifier A2 is 0 because V4>0, the output end out2 of the second amplifier a2 will output a low level, and control the protection switch S1 to be turned on, so that the power supply loop of the battery cell U1 is turned on.

If the battery pack is soaked in water, the first contact P1 and the second contact P2 are communicated through water, which is equivalent to a water resistor Rw connected between the first contact P1 and the second contact P2. Then, the second contact point P2 will become high levelThe water resistance Rw is related to the type and content of impurities in the water and also to the exposed area of the first contact P1 and the second contact P2, and has a size of between 20K Ω and 170K Ω. By presetting the resistance values of the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6, when the level V4 of the inverting input end of the second amplifier a2 is smaller than the level V2' of the non-inverting input end of the second amplifier a2, the output end out2 outputs a high level as a switch control signal to control the protection switch S1 to be switched off, so as to cut off the power supply loop of the battery cell U1.

In another example of the present invention, as shown in fig. 4, the detection circuit U2 can be further provided by the processor chip U21, the second contact P2 is connected to the first pin of the processor chip U21, and the control terminal Ctrl of the protection switch S1 is connected to the second pin of the processor chip U21.

In this case, the first contact P1 may be connected to the positive electrode VCC of the cell U1, or may be connected to the negative electrode GND of the cell U1.

The first pin of the processor chip U21 connected to the second contact P2 may be a General Purpose Input/Output (GPIO) pin; the second pin of the processor chip U21 connected to the control terminal Ctrl of the protection switch S1 may also be an input/output pin.

Under normal conditions, if there is no external influence, the first contact P1 and the second contact P2 are disconnected, and the first pin is in a high impedance state. If the battery pack is soaked in water, the first contact P1 and the second contact P2 are conducted through water. If the first contact P1 is connected to the positive VCC of the cell U1, the first pin will go high; if the first contact P1 is connected to the negative GND of the cell U1, the first pin goes low. Therefore, the program of the processor chip U21 may be preset, so that when the first pin is in a high impedance state (indicating that the first contact P1 and the second contact P2 are disconnected), the processor chip U21 outputs a switch control signal through the second pin to control the protection switch S1 to be turned on, so as to turn on the power supply loop of the cell U1; when the first pin is at a high level or a low level (indicating that the first contact P1 and the second contact P2 are connected), a switch control signal is output through the second pin to control the protection switch S1 to be switched off, so as to cut off the power supply loop of the battery cell U1.

A first pin on the processor chip U21 connected to the second contact P2 may be an Analog-to-Digital Converter (ADC) pin; the second pin on the processor chip U21 connected to the control terminal Ctrl of the protection switch S1 may be an input/output pin.

Under normal conditions, if there is no external influence, the first contact point P1 and the second contact point P2 are disconnected, and the level of the first pin is Va. If the battery pack is flooded such that conduction between the first contact P1 and the second contact P2 is through water, the level of the first pin will change. Thus, the processor chip U21 may be pre-programmed to continuously monitor the level of the first pin. When the level of the first pin is detected to be Va (indicating that the first contact P1 and the second contact P2 are disconnected), outputting a switch control signal through the second pin to control the protection switch S1 to be turned on, so as to turn on the power supply loop of the battery cell U1; when the level of the first pin is detected to be not equal to Va (indicating that the first contact P1 and the second contact P2 are conducted), a switch control signal is output through the second pin to control the protection switch S1 to be switched off so as to cut off the power supply loop of the battery cell U1.

Through this embodiment battery package, can provide the hardware basis for the realization mode that cuts off electric core power supply circuit when battery package soaks.

Optionally, to reduce the circuit footprint, the protection switch S1 may be a fet.

In one example, as shown in fig. 5, the protection switch S1 may be a P-channel Metal-Oxide-Semiconductor Field-Effect Transistor (PMOS Transistor) Q1. When the switch control signal received by the PMOS transistor Q1 is at a low level, it is turned on, and when the switch control signal received by the PMOS transistor Q1 is at a high level, it is turned off. Therefore, when the first contact and the second contact are turned on, if the detection circuit outputs a high level, the PMOS can be used as the protection switch. Specifically, the source of the PMOS transistor Q1 is connected to the positive electrode VCC of the battery cell U1, the drain of the PMOS transistor Q1 is connected to the positive electrode contact P +, and the gate of the PMOS transistor Q1 is connected to the detection circuit U2.

When the gate of the PMOS transistor Q1 receives the low-level switch control signal sent by the detection circuit U2, the PMOS transistor Q1 is turned on. When the gate of the PMOS transistor Q1 receives the high-level switch control signal sent by the detection circuit U2, the PMOS transistor Q1 is turned off.

In another example, as shown in fig. 6, the protection switch S1 may be an N-channel Metal-Oxide-Semiconductor Field-Effect Transistor (NMOS) Q2. When the switch control signal received by the NMOS transistor Q2 is at a high level, the switch is turned on, and when the switch control signal received by the NMOS transistor Q2 is at a low level, the switch is turned off. Therefore, when the first contact and the second contact are turned on, if the detection circuit outputs a low level, the NMOS can be used as the protection switch. Specifically, the source of the NMOS transistor Q2 is connected to the negative GND of the electric core U1, the drain of the NMOS transistor Q2 is connected to the negative contact P-, and the gate of the NMOS transistor Q2 is connected to the detection circuit U2.

When the gate of the NMOS transistor Q2 receives the high-level switch control signal sent by the detection circuit U2, the NMOS transistor Q2 is turned on. When the gate of the NMOS transistor Q2 receives the low-level switch control signal sent by the detection circuit U2, the NMOS transistor Q2 is turned off.

Under the condition that the protection switch is switched on, if the detection circuit detects that the first contact and the second contact are disconnected, the battery pack is not soaked, the protection switch can be continuously controlled to be switched on, so that the power supply loop of the battery core is switched on to supply power to the electric equipment.

The utility model also provides an electric equipment, including aforementioned battery package. The battery pack can be connected with a power supply circuit of the electric equipment through the positive contact P + and the negative contact P-, so that the battery pack can supply power to other functional modules of the electric equipment.

The electric equipment can be, for example, a mobile phone, a tablet, a computer, an electric vehicle and other equipment which need to be powered by a battery pack.

The above embodiments mainly focus on differences from other embodiments, but it should be clear to those skilled in the art that the above embodiments can be used alone or in combination with each other as needed.

Although some specific embodiments of the present invention have been described in detail by way of illustration, it should be understood by those skilled in the art that the above illustration is only for purposes of illustration and is not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A battery pack is characterized by comprising a battery core, a protection switch, a detection circuit, a first contact, a second contact, a positive contact and a negative contact, wherein the battery core, the protection switch and the detection circuit are arranged in a shell of the battery pack; the battery cell forms a power supply loop for supplying power to electric equipment through the positive contact and the negative contact, and the protection switch is arranged on the power supply loop; the first contact is connected with the positive electrode or the negative electrode of the battery cell; the second contact is connected with the detection circuit; the detection circuit is configured to output a switch control signal to the protection switch according to a conduction state between the first contact and the second contact, the switch control signal being used to control a switching state of the protection switch.

2. The battery pack of claim 1, wherein the first contact is connected to a negative electrode of the cell; the detection circuit comprises a first comparator, a first resistor, a second resistor and a third resistor; the second contact is connected with the positive electrode of the battery cell through the first resistor; the second resistor and the third resistor are connected in series between the positive electrode and the negative electrode of the battery cell, and a potential point between the second resistor and the third resistor is connected with a first input end of the first comparator; a second input end of the first comparator is connected with the second contact; and the output end of the first comparator is connected with the control end of the protection switch.

3. The battery pack according to claim 2, wherein the first input terminal of the first comparator is a non-inverting input terminal, the second input terminal of the first comparator is an inverting input terminal, and the first comparator is configured to output a high level as a switch control signal to control the protection switch to be turned off when the first contact and the second contact are turned on;

or,

4. The battery pack of claim 1, wherein the first contact is connected to a positive electrode of the cell; the detection circuit comprises a second comparator, a fourth resistor, a fifth resistor and a sixth resistor; the second contact is connected with the negative electrode of the battery cell through the fourth resistor; the fifth resistor and the sixth resistor are connected in series between the positive electrode and the negative electrode of the battery cell, and a potential point between the fifth resistor and the sixth resistor is connected with the first input end of the second comparator; a second input end of the second comparator is connected with the second contact; and the output end of the second comparator is connected with the control end of the protection switch.

5. The battery pack according to claim 4, wherein the first input terminal of the second comparator is a non-inverting input terminal, the second input terminal of the second comparator is an inverting input terminal, and the second comparator is configured to output a low level as a switch control signal to control the protection switch to be turned off in a case where the first contact and the second contact are connected;

or,

6. The battery pack of claim 1, wherein the detection circuit comprises a processor chip, the second contact is connected to a first pin of the processor chip, and the control terminal of the protection switch is connected to a second pin of the processor chip.

7. The battery pack of claim 6, wherein the first pin is a general purpose input/output pin or an analog-to-digital conversion pin, and the second pin is a general purpose input/output pin.

8. The battery pack according to any one of claims 1 to 7, wherein the protection switch is a field effect transistor.

9. The battery pack according to claim 8, wherein the protection switch is connected between the positive electrode of the electric core and the positive electrode contact, the protection switch is turned off when the switch control signal received by the protection switch is at a high level, the protection switch is provided for a P-channel field effect transistor, a source of the P-channel field effect transistor is connected to the positive electrode of the electric core, a drain of the P-channel field effect transistor is connected to the positive electrode contact, and a gate of the P-channel field effect transistor is connected to the detection circuit;

or,

10. An electric device characterized by comprising the battery pack according to any one of claims 1 to 9.