CN219436645U

CN219436645U - Lithium battery integrated protection board

Info

Publication number: CN219436645U
Application number: CN202320448074.6U
Authority: CN
Inventors: 周远飞
Original assignee: Shenzhen Tuodatong Electronics Co ltd
Current assignee: Shenzhen Tuodatong Electronics Co ltd
Priority date: 2023-03-10
Filing date: 2023-03-10
Publication date: 2023-07-28
Anticipated expiration: 2033-03-10

Abstract

The utility model discloses a lithium battery integrated protection board, which comprises a PCBA board, wherein a protection chip U1 is configured on the PCBA board, a bottom end interface of a lithium battery pack is electrically connected with a 7 th pin of the protection chip U1, a top end interface of the lithium battery pack is electrically connected with a 1 st pin of the protection chip U1, connecting points of every two lithium batteries are sequentially connected to a 4 th pin to a 6 th pin according to corresponding sequences, the lithium battery integrated protection board further comprises a field effect tube Q1 and a field effect tube Q2, the positive electrode of an input power supply is electrically connected with the conducting end of the field effect tube Q1, the lithium battery integrated protection board further comprises a field effect tube Q3, one conducting end of the field effect tube Q3 is electrically connected with a resistor R3, and the resistor R3 is electrically connected with the positive electrode of the input power supply. The utility model samples the voltage of each battery in the battery pack, compares the voltage with the internal precise reference voltage, and when any battery is in an overvoltage or undervoltage state, the chip can perform corresponding control so as to prevent further charge or discharge.

Description

Lithium battery integrated protection board

Technical Field

The utility model relates to the field of batteries, in particular to an integrated protective plate for a lithium battery.

Background

The quality of lithium batteries on the market is good and bad, the service life of a general battery is short, the overcharge or overdischarge protection is mainly improper, the charge and discharge protection of each lithium battery is neglected for an integrated protection board, for example, the integrated protection board of the lithium batteries disclosed in the prior patent document CN202110804328.9 is provided with a power supply module, a control module and an antenna module, and the power supply module and the antenna module are connected with the control module; the voltage of the lithium battery is converted by the power module and then is supplied to the control module, the control module is used for acquiring battery information and positioning information of the lithium battery, and the control module is also used for sending the battery information and the positioning information to the cloud server through the antenna module. The battery monitoring device further comprises a sampling module, wherein the sampling module is connected with the control module and is used for collecting the battery information and sending the battery information to the control module. In a similar prior art, there is no related art technique for accurately sampling the voltage of each battery, resulting in a short battery life.

Disclosure of Invention

In order to achieve the above purpose, the present utility model provides the following technical solutions:

the integrated lithium battery protection board comprises a PCBA board, a protection chip U1 is configured on the PCBA board, the type of the protection chip U1 is UCC3957, a bottom end interface of a lithium battery pack is electrically connected with a 7 th pin of the protection chip U1, a top end interface of the lithium battery pack is electrically connected with a 1 st pin of the protection chip U1, connection points of every two lithium batteries are sequentially connected to a 4 th pin to a 6 th pin, the 4 th pin is grounded, the integrated lithium battery protection board further comprises a field effect transistor Q1 and a field effect transistor Q2, the anode of an input power supply is electrically connected with the conducting end of the field effect transistor Q1, the other conducting end of the field effect transistor Q1 is electrically connected with one conducting end of the field effect transistor Q2, the other conducting end of the field effect transistor Q2 is electrically connected with the 1 st pin of the protection chip U1, the integrated lithium battery protection board further comprises a field effect transistor Q3, one conducting end of the field effect transistor Q3 is electrically connected with a resistor R3, the other conducting end of the field effect transistor Q3 is electrically connected with the anode of an input power supply, and the other conducting end of the field effect transistor Q3 is electrically connected with the control end of the protection chip U1.

Further, the control end of the field effect tube Q1 is electrically connected with one conducting end of the field effect tube Q3, and the control end of the field effect tube Q1 is also electrically connected with the 3 rd pin of the protection chip U1.

Further, the control end of the field effect transistor Q2 is electrically connected to the 13 th pin of the protection chip U1.

Further, when the lithium battery pack is odd, the 2 nd pin and the 16 th pin of the protection chip U1 are electrically connected, and the 6 th pin and the 7 th pin are electrically connected; when the battery pack is even, the 2 nd pin of the protection chip U1 is grounded.

Further, the 11 th pin and the 10 th pin of the protection chip U1 are electrically connected.

Compared with the prior art, the utility model has the following beneficial effects:

the utility model samples the voltage of each battery in the battery pack, compares the voltage with the internal precise reference voltage, and when any battery is in an overvoltage or undervoltage state, the chip can perform corresponding control so as to prevent further charge or discharge.

Drawings

Fig. 1 is a schematic circuit diagram of the present application.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The application provides a lithium cell integrated form protection shield, as shown in fig. 1, including the PCBA board, dispose protection chip U1 on the PCBA board, protection chip U1's model is UCC3957, lithium cell group bottom interface and protection chip U1's 7 th pin electricity are connected, lithium cell group top interface and protection chip U1's 1 st pin electricity are connected, every two lithium cell's connected point is connected to 4 th pin to 6 th pin according to corresponding order, wherein, 4 th pin ground, still include field effect tube Q1, field effect tube Q2, input power's anodal electricity is connected field effect tube Q1's conduction end, another conduction end of field effect tube Q1 and field effect tube Q2's one conduction end electricity is connected, another conduction end of field effect tube Q2 with protection chip U1's 1 st pin electricity is connected, still include field effect tube Q3, one conduction end and resistance R3 electricity are connected, resistance R3 electricity is connected the anodal, another conduction end of field effect tube Q3 and protection chip Q1's electricity is connected. The utility model samples the voltage of each battery in the battery pack, compares the voltage with the internal precise reference voltage, and when any battery is in an overvoltage or undervoltage state, the chip can perform corresponding control so as to prevent further charge or discharge.

In a preferred embodiment, the control end of the field effect transistor Q1 is electrically connected to a conducting end of the field effect transistor Q3, and the control end of the field effect transistor Q1 is further electrically connected to the 3 rd pin of the protection chip U1.

In a preferred embodiment, the control end of the field effect transistor Q2 is electrically connected to the 13 th pin of the protection chip U1.

In a preferred embodiment, when the lithium battery pack is odd, the 2 nd pin and the 16 th pin of the protection chip U1 are electrically connected, and the 6 th pin and the 7 th pin are electrically connected; when the battery pack is even, the 2 nd pin of the protection chip U1 is grounded.

In a preferred embodiment, the 11 th pin and the 10 th pin of the protection chip U1 are electrically connected.

In a specific embodiment, the application provides a lithium battery integrated protection board, as shown in fig. 1, the lithium battery integrated protection board includes a PCBA board, a protection chip U1 is configured on the PCBA board, the model of the protection chip U1 is UCC3957, a bottom end interface of the lithium battery pack is electrically connected with a 7 th pin of the protection chip U1, a top end interface of the lithium battery pack is electrically connected with a 1 st pin of the protection chip U1, connection points of every two lithium batteries are sequentially connected to a 4 th pin to a 6 th pin, wherein the 4 th pin is grounded, the lithium battery integrated protection board further includes a field effect transistor Q1, a field effect transistor Q2, the field effect transistor Q1 and the field effect transistor Q2 are P-channel MOSFET transistors, charging and discharging currents are respectively controlled, an anode of an input power supply is electrically connected with a conducting end of the field effect transistor Q1, another conducting end of the field effect transistor Q1 is electrically connected with a conducting end of the field effect transistor Q2, another conducting end of the field effect transistor Q2 is electrically connected with a 1 st pin of the protection chip U1, the other conducting end of the field effect transistor Q3 is also connected with a positive electrode of the field effect transistor Q3, and the anode of the field effect transistor Q3 is connected with a positive electrode of the power supply 12. The control end of the field effect tube Q1 is electrically connected with one conducting end of the field effect tube Q3, and the control end of the field effect tube Q1 is also electrically connected with the 3 rd pin of the protection chip U1. The control end of the field effect transistor Q2 is electrically connected with the 13 th pin of the protection chip U1. When the lithium battery pack is odd, the 2 nd pin and the 16 th pin of the protection chip U1 are electrically connected, and the 6 th pin and the 7 th pin are electrically connected; when the battery pack is even, the 2 nd pin of the protection chip U1 is grounded. The 11 th pin and the 10 th pin of the protection chip U1 are electrically connected.

When the protection chip U1 detects that any battery is in overdischarge, the 3 rd pin and the 13 th pin of the protection chip U1 output high level, meanwhile, the field effect transistor Q1 and the field effect transistor Q3 are turned off, at the moment, the field effect transistor Q3Q2 and the protection chip U1 enter a dormant state, when the voltage of the 3 rd pin of the protection chip U1 rises to normal voltage, the chip can exit the dormant state after detecting, when a charger is connected, the switch S1 is closed, the 9 th pin of the U1 is communicated with the 16 th pin, the 3 rd pin of the protection chip U1 outputs low level, the charging switch field effect transistor Q1 is conducted, the battery pack is charged, during charging, if the protection chip U1 is in the dormant state, the discharging switch field effect transistor Q2 is still turned off, a charging current flows through a diode in the field effect transistor Q2 to charge the battery pack, and when the voltage of each battery is higher than an undervoltage value, the field effect transistor Q2 is conducted.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The integrated lithium battery protection board is characterized by comprising a PCBA board, wherein a protection chip U1 is configured on the PCBA board, the type of the protection chip U1 is UCC3957, a bottom end interface of a lithium battery pack is electrically connected with a 7 th pin of the protection chip U1, a top end interface of the lithium battery pack is electrically connected with a 1 st pin of the protection chip U1, connecting points of every two lithium batteries are sequentially connected to a 4 th pin to a 6 th pin, the 4 th pin is grounded, the integrated lithium battery protection board further comprises a field effect tube Q1 and a field effect tube Q2, the positive electrode of an input power supply is electrically connected with the conducting end of the field effect tube Q1, the other conducting end of the field effect tube Q1 is electrically connected with one conducting end of the field effect tube Q2, the other conducting end of the field effect tube Q2 is electrically connected with the 1 st pin of the protection chip U1, the integrated lithium battery protection board further comprises a field effect tube Q3, one conducting end of the field effect tube Q3 is electrically connected with a resistor R3, the resistor R3 is electrically connected with the positive electrode of the input power supply, and the other conducting end of the field effect tube Q3 is connected with the control pin of the protection chip Q12.

2. The integrated lithium battery protection board according to claim 1, wherein the control end of the field effect transistor Q1 is electrically connected to a conducting end of the field effect transistor Q3, and the control end of the field effect transistor Q1 is further electrically connected to the 3 rd pin of the protection chip U1.

3. The integrated lithium battery protection board according to claim 1, wherein the control end of the field effect transistor Q2 is electrically connected to a 13 th pin of the protection chip U1.

4. The integrated lithium battery protection board according to claim 1, wherein when the lithium battery pack is an odd number, the 2 nd pin and the 16 th pin of the protection chip U1 are electrically connected, while the 6 th pin and the 7 th pin are electrically connected; when the battery pack is even, the 2 nd pin of the protection chip U1 is grounded.

5. The integrated lithium battery protection plate according to claim 1, wherein the 11 th pin and the 10 th pin of the protection chip U1 are electrically connected.