CN216215974U

CN216215974U - Battery pack

Info

Publication number: CN216215974U
Application number: CN202122486847.3U
Authority: CN
Inventors: 代礼超; 黄建平
Original assignee: Jiangsu Dartek Technology Co Ltd
Current assignee: Jiangsu Dartek Technology Co Ltd
Priority date: 2021-10-15
Filing date: 2021-10-15
Publication date: 2022-04-05
Anticipated expiration: 2031-10-15

Abstract

The utility model discloses a battery pack, which comprises a battery cell and a management module, wherein the management module is configured to be respectively connected with a charger or a controller of a machine tool so as to output a charging signal to the charger or output a discharging signal to the controller of the machine tool, the charging signal and the discharging signal are resistance signals, the management module is configured to output a high-resistance charging signal when the working state of the battery cell is normal, a first ground resistance discharging signal is output, a second ground resistance charging signal is output when the working state of the battery cell is abnormal, and a third ground resistance discharging signal is output. The battery pack provided by the utility model judges whether the battery cell works in a normal working state or an abnormal working state; therefore, after the charger and the controller receive the discharging signal and the charging signal, the charging on-off and the discharging on-off are realized; not only can realize the battery package extension, but also can unite user's former battery package, improved user's convenience and practicality.

Description

Battery pack

Technical Field

The utility model relates to a battery pack.

Background

With the continuous development of lithium battery technology, the application of the direct current electric tool is more and more extensive. In the past, many direct current electric tools have low current, so that charging and discharging protection is performed on a management system of a battery pack. When the battery has the abnormality of overvoltage, overdischarge, overcurrent or overtemperature and the like, the management system of the battery pack can close the charging or discharging loop by itself. With the rapid development of the direct current electric tool, the battery pack is required to meet larger charging and discharging requirements, and if charging or discharging protection is still performed on a management system of the battery pack, not only is the cost greatly increased, but also the whole set of product cannot be developed due to the limitation of the size structure; at present, the battery pack which is moved out to the management system for charging and discharging in the market is not matched with the previous battery pack, so that the waste of the original battery pack of the user is caused, and the dissatisfaction of the user is caused.

The information disclosed in this background section is only for enhancement of understanding of the general background of the utility model and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a battery pack, which can realize the expansion and the integration of the battery pack.

In order to achieve the above object, the present invention provides a battery pack, including a battery cell and a management module, where the management module is configured to be respectively connectable to a charger or a controller of a machine tool to output a charging signal to the charger or output a discharging signal to the controller of the machine tool, where the charging signal and the discharging signal are resistance signals, and the management module is configured to output a high resistance as the charging signal when the battery cell is in a normal operating state, output a first ground resistance as the discharging signal, output a second ground resistance as the charging signal when the battery cell is in an abnormal operating state, and output a third ground resistance as the discharging signal, where resistance values of the first ground resistance and the third ground resistance are different.

In one or more embodiments, the management module comprises:

the protection module is used for detecting working environment parameters of the battery cell to judge whether the working state is abnormal or not, and outputting a first variable resistor RD with different resistance values or outputting a second variable resistor RC with different resistance values according to whether the working state is abnormal or not;

the discharge signal module is electrically connected with the protection module and the controller respectively, and is used for providing the first ground resistor for the controller when the resistance value of the second variable resistor RC is the resistance value under the normal working state, and providing the third ground resistor for the controller when the resistance value of the second variable resistor RC is the resistance value under the abnormal working state;

and the charging signal module is respectively electrically connected with the protection module and the charger and is used for providing the high resistance for the charger when the resistance value of the first variable resistor RD is the resistance value under the normal working state, and providing the second ground resistor for the charger when the resistance value of the first variable resistor RD is the resistance value under the abnormal working state.

In one or more embodiments, the discharge signal module includes: resistance R1, resistance R2, resistance R3 and switch tube Q1, resistance R1's one end with the discharge signal output end Out1 of battery package is connected, the other end with switch tube Q1 is connected, resistance R2 and resistance R3 one end link to each other and are connected switch tube Q1 with the protection module, resistance R2's the other end with the anodal output B + of battery package is connected, resistance R3's the other end with the negative pole output B-of battery package is connected.

In one or more embodiments, the switching tube Q1 is a MOS tube, the drain of the switching tube Q1 is connected to the resistor R1, the source of the switching tube Q1 is connected to the negative output terminal B-of the battery pack, and the gate of the switching tube Q1 is connected to the resistor R2, the resistor R3, and the protection module.

In one or more embodiments, the discharge signal module further includes a capacitor C1, and one end of the capacitor C1 is connected to the discharge signal output terminal Out1 of the battery pack, and the other end is connected to the negative output terminal B-of the battery pack.

In one or more embodiments, the discharge signal module further includes a capacitor C2, and one end of the capacitor C2 is connected to one end of the resistor R2 connected to the resistor R3, and the other end of the capacitor C2 is connected to the negative output terminal B-of the battery pack.

In one or more embodiments, the charging signal module includes: the protection module comprises a resistor R4 and a resistor R5, wherein one end of the resistor R4 is connected with one end of the resistor R5 and is simultaneously connected with the protection module, and the other end of the resistor R4 is respectively connected with a charging signal output end Out2 of the battery pack and a negative electrode output end B-of the battery pack.

In one or more embodiments, the charging signal module further includes a capacitor C3, one end of the capacitor C3 is connected to the end of the resistor R4 connected to the resistor R5 and the protection module, and the other end is connected to the negative output terminal B-of the battery pack.

In one or more embodiments, the charging signal module further includes a capacitor C4, and one end of the capacitor C4 is connected to the charging signal output terminal Out2 of the battery pack, and the other end is connected to the negative output terminal B-of the battery pack.

In one or more embodiments, one end of the first variable resistor RD and one end of the second variable resistor RC are connected to the negative output terminal B "of the battery pack, the other end of the first variable resistor RD is connected to the discharge signal module, and the other end of the second variable resistor RC is connected to the charge signal module.

Compared with the prior art, according to the battery pack provided by the utility model, the management module is configured to output the charging signal with high resistance when the cell working state is normal, and output the discharging signal with the first ground resistance. And the charging signal output when the working state of the battery cell is abnormal is a second ground resistor, and the discharging signal output is a third ground resistor. Wherein the first and third ground resistors have different resistances. Therefore, whether the battery cell works in a normal working state or an abnormal working state can be judged; therefore, after the charger and the controller respectively receive the discharging signal and the charging signal, the charging on-off and the discharging on-off are realized; not only can realize the battery package extension, but also can unite user's former battery package, improved user's convenience and practicality.

Drawings

FIG. 1 is an overall block diagram according to an embodiment of the present invention.

Fig. 2 is a circuit schematic of a management module according to an embodiment of the utility model.

Detailed Description

The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.

Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.

As shown in fig. 1, a battery pack according to an embodiment of the present invention includes a battery cell 1 and a management module 2, and the management module 2 is configured to be connectable to a charger or a controller 20 of a machine tool to output a charging signal to the charger or output a discharging signal to the controller 20 of the machine tool, where the charging signal and the discharging signal are resistance signals. The charger 10 and the controller 20 can control the charging and discharging operations after receiving the discharging signal and the charging signal.

The management module is configured to output a high-resistance charging signal and a high-resistance discharging signal when the cell 1 is in a normal working state, and output a third ground resistance charging signal and a third ground resistance discharging signal when the cell is in an abnormal working state, wherein the first and third ground resistances are different.

The management module 2 includes: a protection module 21, a discharge signal module 22 and a charge signal module 23.

The protection module 21 is configured to detect a working environment parameter of the battery cell 1 to determine whether a working state is abnormal, and output the first variable resistor RD with different resistance values or output the second variable resistor RC with different resistance values according to whether the working state is abnormal. The working environment parameters include information such as voltage and temperature of the battery cell 1.

As shown in fig. 2, one end of the first variable resistor RD and one end of the second variable resistor RC are connected to the negative output terminal B-of the battery pack. The other end of the first variable resistor RD is connected to the discharge signal module 22, and the other end of the second variable resistor RC is connected to the charge signal module 23. One end of the first variable resistor RD has a DO port formed in the protection module 21. The second variable resistor RC has a CO port formed at one end thereof in the protection module 21. The negative output terminal B-of the battery pack may be a ground terminal. Under the condition that the battery cell 1 is in a normal discharge working environment parameter, the resistance value of the first variable resistor RD is 1-10K omega; when the battery cell 1 is in an abnormal discharge working environment parameter, the first variable resistor RD is in a suspended state (i.e., the resistance value is infinite). Under the condition that the battery cell 1 is in a normal charging working environment parameter, the resistance value of the second variable resistor RC is 1-10K omega; when the battery cell 1 is in an abnormal charging working environment parameter, the second variable resistor RC is in a suspended state (i.e., the resistance value is infinite).

The discharge signal module 22 is electrically connected to the protection module 21 and the controller 20, respectively. The discharge signal module 22 is configured to provide the first ground resistor to the controller 20 when the resistance of the second variable resistor RC is a resistance in a normal operating state. And provides the third resistance to ground to the controller 20 when the resistance value of the second variable resistor RC is the resistance value in the abnormal operation state. The controller 20 will turn on to turn on the discharge when the first ground resistance is provided to the controller 20; when the third resistance to ground is provided to the controller 20, the controller 20 turns off the discharge.

As shown in fig. 2, the discharge signal module 22 includes a resistor R1, a resistor R2, a resistor R3, and a switch Q1. The switching tube Q1 is a MOS tube. One end of the resistor R1 is connected with a discharge signal output end Out1 of the battery pack, and the other end of the resistor R1 is connected with the drain electrode of the switching tube Q1; the source of the switching tube Q1 is connected with the negative output end B-of the battery pack. One ends of the resistor R2 and the resistor R3 are connected and are connected with the grid of the switch tube Q1 and the protection module 21, the other end of the resistor R2 is connected with the positive electrode output end B + of the battery pack, and the other end of the resistor R3 is connected with the negative electrode output end B-of the battery pack. The discharging signal module 22 further comprises a capacitor C1, one end of the capacitor C1 is connected with the discharging signal output terminal Out1 of the battery pack, and the other end is connected with the negative electrode output terminal B-of the battery pack. The discharging signal module 22 further comprises a capacitor C2, wherein one end of the capacitor C2 is connected with the gate of the switching tube Q1, and the other end is connected with the negative output end B-of the battery pack.

The discharge signal module 22 can control the on/off of the switching tube Q1 by the variation of the resistance of the first variable resistor RD and by matching with the resistances of the resistor R2 and the resistor R3, so as to obtain a first ground resistor and a third ground resistor, respectively. According to the first ground resistance or the third ground resistance, whether the battery cell 1 works in a normal discharge state or an abnormal discharge state can be judged.

Specifically, the first variable resistor RD is a pull-down resistor of the DO port inside the protection module 21 to the negative output terminal B-of the battery pack. In one embodiment, the resistor R3 is connected in parallel with the first variable resistor RD and then connected in series with the resistor R2 to control the on/off of the switching tube Q1, so as to obtain a first ground resistor and a third ground resistor, respectively. Specifically, the resistor R3 is connected in parallel with the first variable resistor RD and then divided by the resistor R2 to obtain a voltage value V, and the voltage value V can control the on and off of the switching tube Q1.

When the battery cell 1 is in a normal discharge working environment parameter, the resistance value of the first variable resistor RD is 1-10K omega. When the battery cell 1 is in an abnormal operating environment parameter, the first variable resistor RD is in a suspended state (i.e., the resistance value is infinite). At this time, by setting the resistance values of the resistor R2 and the resistor R3, when the battery cell 1 is in the normal discharge operating environment parameter, the switching tube Q1 is in the off state, and outputs the first ground resistance. When the battery cell 1 is in the abnormal discharge working environment parameter, the switching tube Q1 is in an open state, and at this time, the third ground resistance is the resistor R1.

At this time, the output discharge signal has two states, which respectively correspond to the first ground resistor and the third ground resistor. One is the high resistance of the battery cell 1 under the normal discharge working environment parameters, and the other is the resistance value of the battery cell 1 under the abnormal discharge working environment parameters to the resistor R1 at the cathode output end B-of the battery pack. The discharge signals in the two states are clearly different. Through two kinds of discharge signals that have obvious difference to judge that electricity core 1 is in normal discharge operational environment parameter or unusual discharge operational environment parameter, and then after discharge signal transported to the controller 20 of machine tool, controller 20 can open or close according to this discharge signal and discharge.

The charging signal module 23 is electrically connected to the protection module 21 and the charger 10, respectively. The charging signal module 23 is configured to provide a high impedance to the charger 10 when the resistance of the first variable resistor RD is a resistance in a normal operating state. And supplies a second ground resistance to the charger 10 when the resistance value of the first variable resistor RD is the resistance value in the abnormal operation state. When a high impedance is provided to the charger 10, the charger 10 will turn on to turn on the charging; when the second resistance to ground is provided to the charger 10, the charger 10 turns off the charging.

As shown in fig. 2, the charging signal module 23 includes a resistor R4 and a resistor R5, one end of the resistor R4 is connected to one end of the resistor R5 and is also connected to the protection module 21, and the other end of the resistor R4 is connected to the charging signal output terminal Out2 of the battery pack and the negative output terminal B-of the battery pack. The charging signal module 23 further comprises a capacitor C3 and a capacitor C4, one end of the capacitor C3 is connected with the connection end of the resistor R4 and the resistor R5, the other end of the capacitor C3 is connected with the negative output end B-of the battery pack, one end of the capacitor C4 is connected with the charging signal output end of the battery pack, and the other end of the capacitor C4 is connected with the negative output end B-of the battery pack.

As shown in fig. 2, the second variable resistor RC is a pull-down resistor of the CO port inside the protection module 21 to the negative output terminal B-of the battery pack. In one embodiment, the resistor R4 has a resistance of 200K Ω, and the resistor R5 has a resistance of 20K Ω. When the battery cell 1 is in the normal charging working environment parameter, the resistance value of the second variable resistor RC is 1-10K Ω, so that high resistance is provided for the charger 10. When the battery cell 1 is in an abnormal charging operating environment parameter, the second variable resistor RC is in a suspended state (i.e., the resistance value is infinite), and provides a second ground resistance to the charger 10. The two different resistances of the high resistance and the second ground resistance correspond to two different charging signals, and at the moment, the charging signals in the two states are obviously different. Through two charging signals with obvious difference, whether the battery cell 1 is in a normal charging working environment parameter or an abnormal charging working environment parameter is judged, and then after the charging signals are transmitted to the charger 10, the charger 10 can open or close charging according to the charging signals.

The battery pack of the utility model is configured in such a way that the charging signal output by the management module when the cell working state is normal is high-impedance, and the discharging signal output by the management module is a first ground resistor. And the charging signal output when the working state of the battery cell is abnormal is a second ground resistor, and the discharging signal output is a third ground resistor. Wherein the first and third ground resistors have different resistances. Therefore, whether the battery cell works in a normal working state or an abnormal working state can be judged; therefore, after the charger and the controller respectively receive the discharging signal and the charging signal, the charging on-off and the discharging on-off are realized; not only can realize the battery package extension, but also can unite user's former battery package, improved user's convenience and practicality.

The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the utility model to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the utility model and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the utility model and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the utility model be defined by the claims and their equivalents.

Claims

1. A battery pack comprising a battery cell (1) and a management module (2), the management module (2) being configured to be connectable with a charger (10) or a controller (20) of a machine tool, respectively, to output a charging signal to the charger (10) or a discharging signal to the controller (20) of the machine tool, characterized in that: the charging signal and the discharging signal are resistance signals, the management module (2) is configured to output a high-resistance charging signal when the working state of the battery cell (1) is normal, output a high-resistance discharging signal when the working state of the battery cell (1) is normal, output a second ground-resistance charging signal when the working state of the battery cell (1) is abnormal, and output a third ground-resistance discharging signal, wherein the resistance values of the first ground-resistance and the third ground-resistance are different.

2. Battery pack according to claim 1, characterized in that the management module (2) comprises:

the protection module (21) is used for detecting working environment parameters of the battery cell (1) to judge whether the working state is abnormal or not, and outputting a first variable resistor RD with different resistance values or outputting a second variable resistor RC with different resistance values according to whether the working state is abnormal or not;

a discharge signal module (22), wherein the discharge signal module (22) is electrically connected to the protection module (21) and the controller (20), respectively, and is configured to provide the first ground resistor to the controller (20) when the resistance value of the second variable resistor RC is a resistance value in a normal operating state, and provide the third ground resistor to the controller (20) when the resistance value of the second variable resistor RC is a resistance value in an abnormal operating state;

the charging signal module (23) is respectively electrically connected with the protection module (21) and the charger (10), and is used for providing the high resistance for the charger (10) when the resistance value of the first variable resistor RD is the resistance value under the normal working state, and providing the second ground resistor for the charger (10) when the resistance value of the first variable resistor RD is the resistance value under the abnormal working state.

3. The battery pack according to claim 2, wherein the discharge signal module (22) comprises: resistance R1, resistance R2, resistance R3 and switch tube Q1, resistance R1's one end with the discharge signal output end Out1 of battery package is connected, the other end with switch tube Q1 is connected, resistance R2 and resistance R3 one end link to each other and are connected switch tube Q1 with protection module (21), resistance R2's the other end with the anodal output B + of battery package is connected, resistance R3's the other end with the negative pole output B-of battery package is connected.

4. The battery pack of claim 3, wherein the switch transistor Q1 is a MOS transistor, the drain of the switch transistor Q1 is connected to the resistor R1, the source of the switch transistor Q1 is connected to the negative output terminal B-of the battery pack, and the gate of the switch transistor Q1 is connected to the resistor R2, the resistor R3 and the protection module (21).

5. A battery pack as claimed in claim 3, characterised in that the discharge signal module (22) further comprises a capacitor C1, one end of the capacitor C1 being connected to the discharge signal output Out1 of the battery pack and the other end being connected to the negative output B-of the battery pack.

6. A battery pack as in claim 3, wherein the discharge signal module (22) further comprises a capacitor C2, the capacitor C2 having one end connected to the resistor R2 and the resistor R3 and the other end connected to the negative output terminal B-of the battery pack.

7. The battery pack according to claim 2, wherein the charge signal module (23) comprises: the protection circuit comprises a resistor R4 and a resistor R5, wherein one end of the resistor R4 is connected with one end of the resistor R5 and is simultaneously connected with the protection module (21), and the other end of the resistor R4 is respectively connected with a charging signal output end Out2 of the battery pack and a negative electrode output end B-of the battery pack.

8. The battery pack according to claim 7, wherein the charge signal module (23) further comprises a capacitor C3, one end of the capacitor C3 is connected to the resistor R4 and the resistor R5 and the protection module, and the other end is connected to the negative output terminal B-of the battery pack.

9. The battery pack of claim 7, wherein the charge signal module (23) further comprises a capacitor C4, one end of the capacitor C4 is connected to the charge signal output Out2 of the battery pack, and the other end is connected to the negative output B-of the battery pack.

10. The battery pack according to claim 2, wherein one end of the first variable resistor RD and one end of the second variable resistor RC are connected to a negative output terminal B "of the battery pack, the other end of the first variable resistor RD is connected to the discharge signal module (22), and the other end of the second variable resistor RC is connected to the charge signal module (23).