New energy lithium battery protection board

Abstract

The utility model is suitable for the technical field of lithium batteries, and provides a new energy lithium battery protection board, which comprises an IC (integrated circuit) chip module for monitoring the abnormal condition of a single battery and managing the single battery and / or a total battery pack; the communication interface is connected with the IC chip module and is used for communicating with other protection boards; the electromagnetic relay is used for controlling on-off of the single batteries; through the arrangement of the communication interface and the IC chip module, a plurality of lithium battery protection plates can form a series structure to form a volt number variable high-voltage battery pack, and each lithium battery protection plate can control the on-off of current to realize independent control; compared with the prior art, main electromagnetic relays are installed at the positive electrode and the negative electrode, on one hand, high temperature of the field effect MOS tube of a single protection plate caused by series high voltage use can be avoided, and on the other hand, the electromagnetic relays at the main positive electrode and the main negative electrode can be instantaneously disconnected to achieve protection when abnormity occurs.

Description

Technical Field

[0001] This utility model belongs to the field of lithium battery technology, and in particular relates to a protection board for new energy lithium batteries. Background Technology

[0002] In the fields of two-wheeled and three-wheeled electric vehicles and energy storage, existing lead-acid batteries suffer from short driving range and short lifespan. Therefore, electric vehicles are gradually switching to lithium batteries for power supply. However, existing lithium batteries have the following problems: low compatibility, poor safety, limited applicability, high safety risks, and non-universal battery specifications. For example, existing 12V protection boards can only be connected in parallel, not in series with other protection boards to create high voltage. Furthermore, using MOSFETs to control circuit switching can cause high temperatures in individual protection board MOSFETs under series high voltage conditions. Utility Model Content

[0003] The purpose of this utility model embodiment is to provide a new energy lithium battery protection board, which aims to solve the technical problems existing in the prior art mentioned in the background art.

[0004] This utility model embodiment is implemented as follows: a new energy lithium battery protection board, characterized in that the protection board includes:

[0005] IC chip modules are used to monitor abnormal conditions of individual battery cells and manage individual battery cells and / or the entire battery pack.

[0006] A communication interface, connected to the IC chip module, is used for communication with other protection boards;

[0007] Electromagnetic relays are used to control the on / off state of individual battery cells;

[0008] A field-effect MOSFET is connected to the IC chip module and is used to receive instructions from the IC chip module to control the opening and closing of the electromagnetic relay.

[0009] As a preferred technical solution of this utility model: the IC chip module includes an IC chip, as well as a current detection circuit and a temperature detection circuit for detecting the current and temperature of a single battery cell.

[0010] As another preferred technical solution of this utility model: the electromagnetic relay is a mechanical T90 normally closed 4-pin electromagnetic relay, the electromagnetic relay is installed at the positive and negative terminals of the single battery, and the electromagnetic relay is connected to the field-effect MOSFET.

[0011] As another preferred technical solution of this utility model: the communication interface is an RS485 interface.

[0012] The beneficial effects of this utility model embodiment are as follows: This application, through the setting of communication interface and IC chip module, enables multiple lithium battery protection boards to form a series structure, forming a variable voltage high-voltage battery pack, and the current on and off can be controlled in each lithium battery protection board to achieve independent control; moreover, unlike the prior art, a total electromagnetic relay is installed at both the positive and negative terminals, which on the one hand can avoid the high temperature of the field effect MOSFET of a single protection board caused by the use of series high voltage, and on the other hand can also instantly disconnect the electromagnetic relay at the positive and negative terminals when an abnormality occurs, so as to achieve protection. Attached Figure Description

[0013] Figure 1 A circuit diagram of a new energy lithium battery protection board provided for an embodiment of this utility model. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0015] It is understood that the terms “first,” “second,” etc., used in this application may be used herein to describe various elements, but unless otherwise stated, these elements are not limited by these terms. These terms are used only to distinguish one element from another.

[0016] like Figure 1 As shown, in one embodiment, a new energy lithium battery protection board is proposed, the protection board comprising:

[0017] IC chip modules are used to monitor abnormal conditions of individual battery cells and manage individual battery cells and / or the entire battery pack.

[0018] A communication interface is connected to the IC chip module for communicating with other protection boards. Preferably, the communication interface is an RS485 interface.

[0019] Electromagnetic relays are used to control the on / off state of individual battery cells;

[0020] A field-effect MOSFET is connected to the IC chip module and is used to receive instructions from the IC chip module to control the opening and closing of the electromagnetic relay.

[0021] In practical applications, this utility model embodiment collects current and voltage detection data and temperature control data of a single battery cell (or a single cell, such as a 3.2V / 3.7V cell) through an IC chip module. When an abnormal condition such as overcharge, over-discharge, overcurrent, high voltage, short circuit, or high temperature is detected in a single battery cell, the IC chip module sends a command to the field-effect MOSFET, thereby controlling the electromagnetic relay to engage.

[0022] In this embodiment of the invention, by setting up a communication interface and an IC chip module, multiple lithium battery protection boards can be connected in series to form a variable voltage high-voltage battery pack, and the current can be controlled in each lithium battery protection board to achieve independent control.

[0023] like Figure 1 As shown, in a preferred embodiment of the present invention, the IC chip module includes an IC chip, and a current detection circuit and a temperature detection circuit for detecting the current and temperature of a single battery cell. The temperature detection circuit can be composed of a temperature sensor and its auxiliary circuits, and the current detection circuit can be a conventional detection circuit. The present invention does not impose any additional limitations here.

[0024] like Figure 1 As shown, in another preferred embodiment of this utility model, the electromagnetic relay is a mechanical T90 normally closed 4-pole electromagnetic relay. The electromagnetic relay is installed at the positive and negative terminals of the single battery cell, and the electromagnetic relay is connected to the field-effect MOSFET.

[0025] In this embodiment of the utility model, unlike the prior art, the method of directly controlling the circuit on and off with a field-effect MOSFET is not used. Instead, an electromagnetic relay is used to control the circuit on and off to replace the field-effect MOSFET, thus avoiding the high temperature of the field-effect MOSFET on a single protection board caused by the use of series high voltage.

[0026] Furthermore, unlike the prior art which uses a method of outputting the same positive terminal without controlling the on / off state of the positive terminal, this embodiment of the present invention instantaneously disconnects the electromagnetic relays at the positive and negative terminals when an abnormality occurs, thereby achieving protection.

[0027] As can be seen from the above embodiments, in practical applications, when managing individual batteries, the present invention collects current and voltage detection data and temperature control data of individual batteries (or individual cells, such as 3.2V / 3.7V cells) through an IC chip module. When abnormal conditions such as overcharge, over-discharge, overcurrent, high voltage, short circuit, or high temperature are detected in an individual battery, the IC chip module sends a command to the field-effect MOSFET, thereby controlling the electromagnetic relay to engage.

[0028] When the protection board is connected in series with high voltage, all data can be integrated through IC chip modules to simultaneously manage the voltage of all individual cells and the total voltage. It detects all individual cells and the entire battery pack. When abnormalities such as overcharge, over-discharge, overcurrent, high voltage, short circuit, and high temperature are detected, each IC chip module controls the MOSFET to send a signal to the electromagnetic relay, which in turn controls the electromagnetic relay in each protection board to disconnect the circuit, thus protecting the overall module's safety performance.

[0029] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0030] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

[0031] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A protection board for a new energy lithium battery, characterized in that, The protective plate includes: IC chip modules are used to monitor abnormal conditions of individual battery cells and manage individual battery cells and / or the entire battery pack. A communication interface, connected to the IC chip module, is used to communicate with the protection board; Electromagnetic relays are used to control the on / off state of individual battery cells; A field-effect MOSFET is connected to the IC chip module and is used to receive instructions from the IC chip module to control the opening and closing of the electromagnetic relay.

2. The new energy lithium battery protection board according to claim 1, characterized in that, The IC chip module includes an IC chip, as well as a current detection circuit and a temperature detection circuit for detecting the current and temperature of individual battery cells.

3. The new energy lithium battery protection board according to claim 1, characterized in that, The electromagnetic relay is a mechanical T90 normally closed 4-pin electromagnetic relay. The electromagnetic relay is installed at the positive and negative terminals of the single cell and is connected to a field-effect MOSFET.

4. The new energy lithium battery protection board according to claim 1, characterized in that, The communication interface is an RS485 interface.

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