Lithium battery charging protection module

Abstract

The utility model discloses a lithium battery charging protection module, which is used in a battery charging circuit and comprises a shell and a battery protection board. A shell inner cavity is formed in the shell, the battery protection plate is installed in the shell inner cavity, and an MOS tube, a voltage monitoring module and a controller are arranged on the battery protection plate; the MOS tube is used for being connected in series in a battery charging circuit; the voltage monitoring module is used for being electrically connected in a battery charging circuit so as to monitor the charging voltage value of the battery charging circuit. The controller is electrically connected to the MOS tube and the voltage monitoring module. The utility model provides a battery protection device independent of a BMS (Battery Management System), so as to more reliably protect the battery and improve the convenience of maintenance.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium battery technical field, especially a lithium battery charging protection module. BACKGROUND

[0002] At present, the charging and discharging process of the battery is managed through BMS (battery management system), and the charging protection circuit is integrated on the BMS to cut off the battery charging circuit when overvoltage and other charging abnormalities occur, thereby protecting the battery. However, integrating the battery protection circuit on the BMS will reduce the reliability of the battery protection circuit in operation and cause inconvenience in the maintenance of the battery protection circuit.

[0003] If a battery protection device independent of the BMS can be designed to protect the battery charging through the battery protection device, the working reliability and the convenience of maintenance can be effectively improved. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a lithium battery charging protection module, and solves the technical problem of how to provide a battery protection device independent of the BMS.

[0005] To achieve the above purpose, the solution of the utility model is as follows: a lithium battery charging protection module is used in a battery charging circuit and includes a shell and a battery protection board.

[0006] A shell cavity is formed in the shell, the battery protection board is installed in the shell cavity, and the battery protection board is provided with a MOS tube, a voltage monitoring module, and a controller.

[0007] The MOS tube is used to be connected in series in the battery charging circuit.

[0008] The voltage monitoring module is used to be electrically connected in the battery charging circuit to monitor the charging voltage value of the battery charging circuit.

[0009] The controller is electrically connected to the MOS tube and the voltage monitoring module.

[0010] Further, the shell is provided with a heat dissipation fin.

[0011] The shell is provided with a heat dissipation opening to communicate the shell cavity with the outside through the heat dissipation opening.

[0012] The heat dissipation fin is installed in the shell cavity and connected to the battery protection board, a plurality of heat dissipation fins are formed in an array on the heat dissipation fin at intervals, and each heat dissipation fin is arranged perpendicularly to the heat dissipation opening.

[0013] Further, the heat dissipation openings are respectively formed in the opposite two side walls of the shell, and each heat dissipation fin extends between the two side walls of the shell provided with the heat dissipation openings.

[0014] Further, the heat dissipation fin is spaced from the battery protection plate and is connected to the battery protection plate by a copper column.

[0015] Further, a cable and / or a nut terminal are connected to the battery protection plate, the cable passes out of the shell, the nut terminal is exposed to the shell, and the MOS tube and the voltage monitoring module are electrically connected to the battery charging circuit through the cable and / or the nut terminal.

[0016] Further, a threading hole is formed in the shell, and a flexible ring is mounted on a hole wall of the threading hole, and the cable passes through the flexible ring to pass out of the shell.

[0017] Further, the controller is used for receiving a charging voltage value of the battery charging circuit monitored by the voltage monitoring module, and controlling the MOS tube to cut off the battery charging circuit when the charging voltage value reaches an upper limit.

[0018] Further, a switching button is arranged on the battery protection plate, the switching button is electrically connected to the controller and is exposed to the shell, and is used for switching the upper limit of the charging voltage value.

[0019] Further, one indicator lamp is arranged on the battery protection plate corresponding to different upper limits of the charging voltage value, and each indicator lamp is exposed to the shell and is communicatively connected to the controller.

[0020] After the above scheme is adopted, the battery protection plate is installed in the shell cavity, the MOS tube is arranged on the battery protection plate and is used for being connected in series in the battery charging circuit, the voltage monitoring module is arranged on the battery protection plate and is used for being electrically connected in the battery charging circuit, and the controller is electrically connected to the MOS tube and the voltage monitoring module, and the MOS tube is controlled to cut off and conduct the battery charging circuit according to the battery charging circuit voltage value monitored by the voltage monitoring module, thereby forming a battery charging protection module which is independent of the BMS and works independently, and the working is more reliable and stable, and the maintenance is more convenient. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a perspective view of the utility model;

[0022] Figure 2 It is a schematic view of the internal structure of the shell of the utility model;

[0023] Figure 3 It is Figure 2 It is a local enlarged view of A in the middle;

[0024] Figure 4 It is a schematic view of the connection of the battery protection plate and the heat dissipation fin;

[0025] Figure 5 It is a schematic view of the circuit connection of the utility model.

[0026] Explanation of reference numerals: 1 - shell, 2 - battery protection plate, 3 - heat dissipation fin, 4 - shell inner cavity, 5 - heat dissipation opening, 6 - heat dissipation fin, 7 - copper column, 8 - cable, 9 - threading hole, 10 - flexible ring, 11 - switching button, 12 - indicator light, 13 - heat dissipation channel, 14 - nut terminal, 15 - connecting lug, 16 - screw hole, 17 - upper shell, 18 - bottom plate, 19 - MOS tube, 20 - voltage monitoring module, 21 - controller. DETAILED DESCRIPTION

[0027] The utility model will be explained in detail below in combination with the drawings and specific embodiments.

[0028] The embodiments of the utility model will be described below in detail with reference to the drawings. It should be noted that the utility model can be implemented in different forms and is not limited to the embodiments explained herein. The provision of these embodiments aims to make the present disclosure thorough and complete and to fully convey the scope of the utility model to those skilled in the art.

[0029] The utility model provides a kind of lithium battery charging protection module, as shown in Figures 1-5 It is used to be arranged in the battery charging circuit between battery and charging power supply, including shell 1 and battery protection plate 2;Shell 1 is formed with shell inner cavity 4 in it, and battery protection plate 2 is installed in shell inner cavity 4, and MOS tube 19, voltage monitoring module 20 and controller 21 are provided on battery protection plate 2;MOS tube 19 is full name MOSFET metal-oxide semiconductor field effect transistor, for being connected in series in battery charging circuit, specifically in this embodiment, it is arranged on charging loop;Voltage monitoring module 20 can be any kind of electrical element for collecting voltage value in the prior art, for being electrically connected in battery charging circuit, to monitor the charging voltage value of battery charging circuit;Controller 21 can be any kind of programmable controller, specifically in this embodiment, 8051 single-chip microcomputer is used, and controller 21 is electrically connected to MOS tube 19 and voltage monitoring module 20, so that controller 21 is used to receive the charging voltage value of battery charging circuit monitored by voltage monitoring module 20, and when charging voltage value reaches the voltage upper limit set in controller 21, MOS tube 19 is controlled to cut off battery charging circuit, to play the role of protecting battery, since in this scheme, the charging protection device separated from BMS is formed, and is protected by shell 1, so that charging protection function is more reliable, and in the case that MOS tube 19 is fused, maintenance and replacement are more convenient.

[0030] In order to improve the heat dissipation of the battery protection plate 2 in the shell 1, the preferred embodiment further comprises a heat sink 3; the shell 1 is provided with a heat dissipation opening 5 to communicate the shell cavity 4 with the outside through the heat dissipation opening 5, and the shell 1 is formed by buckling an upper shell 17 and a bottom plate 18; the heat sink 3 is installed in the shell cavity 4 and connected with the battery protection plate 2, a plurality of heat dissipation fins 6 are formed on the heat sink 3 in an array, each heat dissipation fin 6 is arranged perpendicular to the heat dissipation opening 5, and a heat dissipation channel 13 is formed between two adjacent heat dissipation fins 6, so that the outside air entering the shell cavity 4 from the heat dissipation opening 5 is more easily guided along the heat dissipation channel 13 to each heat dissipation fin 3, thereby ensuring the heat dissipation effect. In order to further enhance the heat dissipation effect, the heat dissipation opening 5 is formed on the opposite two side walls of the shell 1, and each heat dissipation fin 6 extends between the two side walls of the shell 1 provided with the heat dissipation opening 5.

[0031] In a more preferred embodiment, the heat sink 3 is made of aluminum material, which has a high thermal conductivity and a light weight, so that the heat sink 3 with a large volume is made of aluminum material, which can reduce the weight of the device while ensuring the heat dissipation performance, the heat sink 3 is spaced from the battery protection plate 2 and connected and fixed to the battery protection plate 2 through copper columns 7 at four corners, the copper column 7 has a small volume, so that a copper material with a higher heat dissipation coefficient is used to enable the heat generated by the battery protection plate 2 to be efficiently conducted to the heat sink 3, and the shell 1 is preferably made of ABS plastic, so that the shell 1 has good heat resistance, insulation and impact resistance.

[0032] In order to facilitate the electrical connection of the battery protection plate 2 and the battery charging circuit, the cable 8 and / or the nut terminal 14 are connected to the battery protection plate 2, the cable 8 passes out of the shell 1, and the nut terminal 14 is exposed to the shell 1, and the MOS tube 19 and the voltage monitoring module 20 are electrically connected to the battery charging circuit through the cable 8 and / or the nut terminal 14; more specifically, in this embodiment, two cables 8 are connected to the battery protection plate 2, one of which is a negative power line for providing a current loop when the battery is charging, and the other is a positive power line for collecting voltage, and a nut terminal 14 is further provided on the battery protection plate 2, which provides a negative interface for input power when the lithium battery is charging; in order to avoid damage to the cable 8, a threading hole 9 is formed on the shell 1, and a flexible ring 10 is installed on the hole wall of the threading hole 9, and the cable 8 passes through the flexible ring 10 to pass out of the shell 1 to the outside of the shell 1.

[0033] The battery protection board 2 is provided with a switching button 11, which is electrically connected to the controller 21 and exposed to the shell, and is used for switching the upper limit of the charging voltage value, and in the embodiment, the upper limit of the voltage is provided with four values, i.e. 12V, 24V, 36V or 48V, so as to control the MOS tube 19 to be disconnected when the charging voltage value of the battery charging circuit reaches the corresponding upper limit. The battery protection board 2 is provided with an indicating lamp 12 corresponding to different charging voltage upper limits, and each indicating lamp 12 is exposed to the shell 1 and is communicatively connected to the controller to be lighted when switched to the corresponding voltage upper limit, thereby playing an indicating role.

[0034] In the preferred embodiment, the battery protection board 2 takes power from the battery end through DC-DC, and the power is reduced to 12V or 5V through a voltage reduction chip to supply power to the controller 21, and the controller 21 is further electrically connected with a buzzer to alarm when the voltage upper limit is reached.

[0035] In order to facilitate the fixing of the shell 1, preferably in the embodiment, the opposite sides of the shell 1 are respectively transversely provided with a connecting lug 15, and the connecting lug 15 is provided with a screw through hole 16, so that the shell 1 can be screwed and fixed in a predetermined position through the screw passing through the screw through hole 16.

[0036] The above is only the preferred embodiment of the present application, and is not a limitation on the design of the present application. Any equivalent changes made according to the key design of the present application shall fall within the protection scope of the present application.

Claims

1. A lithium battery charging protection module, used in a battery charging circuit, characterized in that: Includes a housing (1) and a battery protection board (2); A housing cavity (4) is formed inside the housing (1), and a battery protection board (2) is installed in the housing cavity (4). The battery protection board (2) is equipped with a MOS transistor (19), a voltage monitoring module (20) and a controller (21). The MOSFET (19) is used in series in the battery charging circuit; The voltage monitoring module (20) is electrically connected in the battery charging circuit to monitor the charging voltage value of the battery charging circuit; The controller (21) is electrically connected to the MOSFET (19) and the voltage monitoring module (20).

2. The lithium battery charging protection module as described in claim 1, characterized in that: It also includes a heat sink (3); The housing (1) has a heat dissipation vent (5) so that the inner cavity (4) of the housing can be connected to the outside through the heat dissipation vent (5); The heat sink (3) is installed in the inner cavity (4) of the housing and connected to the battery protection board (2). Multiple heat dissipation fins (6) are formed on the heat sink (3) in an array at intervals, and each heat dissipation fin (6) is set perpendicular to the heat dissipation port (5).

3. The lithium battery charging protection module as described in claim 2, characterized in that: The heat dissipation vents (5) are respectively provided on the opposite side walls of the housing (1), and each heat dissipation fin (6) extends between the two side walls of the housing (1) where the heat dissipation vents (5) are provided.

4. The lithium battery charging protection module as described in claim 2, characterized in that: The heat sink (3) is spaced apart from the battery protection board (2) and is connected and fixed to the battery protection board (2) by a copper pillar (7).

5. The lithium battery charging protection module as described in claim 1, characterized in that: The battery protection board (2) is connected to a cable (8) and / or a nut terminal (14). The cable (8) passes through the housing (1) and the nut terminal (14) is exposed in the housing (1). The MOS transistor (19) and the voltage monitoring module (20) are electrically connected to the battery charging circuit through the cable (8) and / or the nut terminal (14).

6. The lithium battery charging protection module as described in claim 5, characterized in that: The housing (1) has a wire hole (9) and a flexible ring (10) is installed on the wall of the wire hole (9). The cable (8) passes through the flexible ring (10) to pass out from inside the housing (1) to outside the housing (1).

7. The lithium battery charging protection module as described in claim 1, characterized in that: The controller (21) is used to receive the charging voltage value of the battery charging circuit monitored by the voltage monitoring module (20), and when the charging voltage value reaches the upper limit, it controls the MOS transistor (19) to cut off the battery charging circuit.

8. The lithium battery charging protection module as described in claim 7, characterized in that: The battery protection board (2) is provided with a switching button (11), which is electrically connected to the controller (21) and exposed in the housing, and is used to switch the upper limit of the charging voltage value.

9. The lithium battery charging protection module as described in claim 8, characterized in that: The battery protection board (2) is provided with an indicator light (12) corresponding to different charging voltage values. Each indicator light (12) is exposed in the housing (1) and is connected to the controller.

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