CN219554625U

CN219554625U - Lithium battery protection board supporting wide-voltage charging

Info

Publication number: CN219554625U
Application number: CN202320456438.5U
Authority: CN
Inventors: 刘延; 李俊杰; 李军
Original assignee: Xi'an Xindetong Information Technology Co ltd
Current assignee: Xi'an Xindetong Information Technology Co ltd
Priority date: 2023-03-10
Filing date: 2023-03-10
Publication date: 2023-08-18
Anticipated expiration: 2033-03-10

Abstract

The utility model belongs to the technical field of lithium battery protection boards, in particular to a lithium battery protection board supporting wide-voltage charging, which comprises a protection board, wherein an MOS switch is arranged on the left side of the upper end of the protection board, an MOS opening and closing accelerating circuit is arranged in the middle of the upper end of the protection board, a front end chip and an MCU are arranged on the right side of the upper end of the protection board, the MCU is positioned on the right side of the front end chip, the MOS switch, the MOS opening and closing accelerating circuit, the front end chip and the MCU are sequentially connected, and after the lithium battery is assembled with the lithium battery protection board supporting wide-voltage charging, normal charging can be carried out by using any charger of 48V, 60V and 72V on the market, so that the phenomenon that the MOS switch on the protection board is damaged after repeated charging due to misoperation of a user, and the phenomenon that the lithium battery cannot normally work is avoided.

Description

Lithium battery protection board supporting wide-voltage charging

Technical Field

The utility model belongs to the technical field of lithium battery protection plates, and particularly relates to a lithium battery protection plate supporting wide-voltage charging.

Background

The rated voltage of lithium battery packs for two-wheel and three-wheel vehicles in the market is generally 48V, 60V and 72V; the chargers for charging these lithium batteries are also everywhere, and it is often the case that a 60V or 48V lithium battery is charged with a 72V charger.

The common lithium battery pack protection board in the market is not provided with an accelerating circuit for MOS opening and MOS closing, so that a high-voltage difference charger gathers too much charge at a MOS switch driving circuit on the protection board when the lithium battery pack is charged, the MOS switch cannot rapidly work in a saturated conduction state but is in an amplifying state, and the PN junction temperature in the MOS switch is rapidly raised to cause the damage of the MOS switch, so that the MOS switch fails to work; when the charging is finished, too much charge is accumulated at the MOS switch driving circuit on the protection plate, so that the MOS switch can not work in a saturated conduction state and is in an amplifying state, and the PN junction temperature in the MOS switch is rapidly increased to cause MOS damage, and the MOS switch works to fail; when such phenomenon happens for many times, the protection board can thoroughly fail in work, so that the protection board which only supports single matching voltage can generate the phenomenon that the protection board of the lithium battery pack is damaged after many times of charging due to overlarge pressure difference between the charger and the lithium battery pack when the charger voltage and the lithium battery pack voltage are not matched when the lithium battery pack is charged, the normal use of a user is influenced, and the loss is caused for the user.

In view of the above, we propose a lithium battery protection plate supporting wide-voltage charging.

Disclosure of Invention

In order to solve the problems in the prior art, the utility model provides the lithium battery protection board supporting wide-voltage charging, after the lithium battery is assembled with the lithium battery protection board supporting wide-voltage charging, any charger of 48V, 60V and 72V in the market can be used for normal charging, so that the phenomenon that an MOS switch on the protection board is damaged after repeated charging due to misoperation of a user and the charging voltage of a charger and a lithium ion battery pack is not matched, and the lithium battery protection board cannot work normally is avoided.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a support lithium cell protection shield that wide voltage charged, includes the protection shield, the upper end left side of protection shield is provided with the MOS switch, the upper end intermediate position of protection shield is provided with MOS and opens and close accelerating circuit, the upper end right side of protection shield is provided with front end chip and MCU, MCU is located the right side of front end chip, MOS switch, MOS open and close accelerating circuit, front end chip, MCU link to each other in proper order.

As a preferred technical scheme of the lithium battery protection board supporting wide-voltage charging, the P-of the MOS switch is connected with the P-of an external charger, the B-of the MOS switch is connected with the B-of an external lithium ion battery pack, and the MOS switch is used for controlling the charging and discharging of the external lithium ion battery pack.

As a preferable technical scheme of the lithium battery protection board supporting wide-voltage charging, the MOS opening and closing acceleration circuit is used for adapting to large-voltage-difference charging.

As a preferred technical scheme of the lithium battery protection board supporting wide-voltage charging, the front-end chip is used for collecting voltages of all battery cells forming an external lithium ion battery, collecting charging and discharging currents of the external lithium ion battery and controlling MOS switches.

As a preferable technical scheme of the lithium battery protection board supporting wide-voltage charging, the MCU is used for setting protection parameters, external communication and front-end control.

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

the utility model is formed by protecting plate and MOS switch, MOS opening and closing accelerating circuit, front end chip and MCU which are set up on protecting plate, when charging lithium ion battery, P+ of charger is connected with B+ of lithium ion battery, P-of charger is connected with P-of MOS switch, B-of lithium ion battery is connected with B-of MOS switch; when charging is started, the MOS switch can be quickly in a saturated conduction state under the support of the MOS on/off acceleration circuit, so that the PN junction temperature cannot be raised; when the charging is finished, the MOS switch can be quickly in a saturated conduction state under the support of the MOS on and off acceleration circuit, so that the PN junction temperature cannot be raised; through the support of MOS opening and closing accelerating circuit, when making high pressure differential charger charge for lithium ion battery, can release the electric charge of MOS switch drive department rapidly, make the MOS switch can work at normal on-state rapidly, ensure to charge normally, after this lithium cell protection shield that supports wide pressure charging is assembled to the lithium cell, can carry out normal charging with 48V, 60V and 72V arbitrary charger on the market, thereby avoided because the user maloperation causes because charger and lithium ion battery charge voltage mismatch, damage the MOS switch on the protection shield after leading to many times of charging, and then lead to the phenomenon that the lithium cell protection shield can not normally work.

Drawings

The accompanying drawings are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate the utility model and together with the embodiments of the utility model, serve to explain the utility model. In the drawings:

FIG. 1 is a schematic diagram of the structure of the present utility model;

fig. 2 is a diagram of a MOS on and off acceleration circuit of the present utility model;

fig. 3 is a charging block diagram of the present utility model.

In the figure: 1. a protective plate; 2. a MOS switch; 3. MOS opens and closes the accelerating circuit; 4. a front end chip; 5. and (3) an MCU.

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.

Examples

Referring to fig. 1-3, the present utility model provides the following technical solutions: a lithium battery protection board supporting wide-voltage charging comprises a protection board 1, an MOS switch 2 for controlling charging and discharging of a lithium ion battery pack, an MOS on/off acceleration circuit 3 for adapting to large-voltage-difference charging, an MCU5 for collecting voltages of all battery cores forming the lithium ion battery, collecting charging and discharging currents of the lithium ion battery, controlling the MOS switch 2, setting protection parameters, communicating outside and controlling front ends.

Referring to fig. 1 and 3, specifically, the MOS switch 2 is disposed on the left side of the upper end of the protection plate 1, the MOS on-off acceleration circuit 3 is disposed at the middle position of the upper end of the protection plate 1, the front chip 4 and the MCU5 are disposed on the right side of the upper end of the protection plate 1, the MCU5 is disposed on the right side of the front chip 4, and the MOS switch 2, the MOS on-off acceleration circuit 3, the front chip 4, and the MCU5 are sequentially connected.

Further, as shown in fig. 3, the P-of the MOS switch 2 is connected to the P-of the external charger, and the B-of the MOS switch 2 is connected to the B-of the external lithium ion battery pack.

In the embodiment, the utility model consists of a protection plate 1, a MOS switch 2, a MOS on-off acceleration circuit 3, a front end chip 4 and an MCU5, wherein the MOS on-off acceleration circuit 3, the front end chip 4 and the MCU5 are arranged on the protection plate 1; when charging is started, the MOS switch 2 can quickly enable the MOS switch 2 to be in a saturated conduction state under the support of the MOS on-off acceleration circuit 3, so that PN junction temperature cannot be raised; when the charging is finished, the MOS switch 2 can quickly enable the MOS switch 2 to be in a saturated conduction state under the support of the MOS on-off acceleration circuit 3, so that the PN junction temperature cannot be raised; through the support of the MOS on-off acceleration circuit 3, when the high-voltage difference charger charges the lithium ion battery pack, the electric charge at the driving part of the MOS switch 2 can be rapidly released, so that the MOS switch 2 can rapidly work in a normal conduction state, normal charging can be ensured, after the lithium battery is assembled with the lithium battery protection board supporting wide-voltage charging, the lithium battery protection board can be normally charged by any charger of 48V, 60V and 72V in the market, thereby avoiding the phenomenon that the MOS switch 2 on the protection board 1 is damaged after repeated charging due to misuse of a user caused by mismatching of charging voltages of the charger and the lithium ion battery pack, and further the lithium battery protection board cannot normally work.

In addition, the contents of the present embodiment, which are not described in detail, are within the scope of the prior art and common general knowledge in the art

Finally, it should be noted that: the above is only a preferred embodiment of the present utility model, and the present utility model is not limited thereto, but it is to be understood that the present utility model is described in detail with reference to the foregoing embodiments, and modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. Lithium battery protection board that supports wide voltage charging, including protection board (1), its characterized in that: the MOS switch (2) is arranged on the left side of the upper end of the protection plate (1), the MOS opening and closing accelerating circuit (3) is arranged at the middle position of the upper end of the protection plate (1), the front end chip (4) and the MCU (5) are arranged on the right side of the upper end of the protection plate (1), the MCU (5) is positioned on the right side of the front end chip (4), and the MOS switch (2), the MOS opening and closing accelerating circuit (3), the front end chip (4) and the MCU (5) are sequentially connected.

2. A lithium battery protection plate supporting wide voltage charging according to claim 1, wherein: the P-of the MOS switch (2) is connected with the P-of an external charger, the B-of the MOS switch (2) is connected with the B-of an external lithium ion battery pack, and the MOS switch (2) is used for controlling the charge and discharge of the external lithium ion battery pack.

3. A lithium battery protection plate supporting wide voltage charging according to claim 1, wherein: the MOS on and off acceleration circuit (3) is used for adapting to large-voltage-difference charging.

4. A lithium battery protection plate supporting wide voltage charging according to claim 1, wherein: the front-end chip (4) is used for collecting voltages of all battery cells forming the external lithium ion battery and collecting charging and discharging currents of the external lithium ion battery and controlling the MOS switch (2).

5. A lithium battery protection plate supporting wide voltage charging according to claim 1, wherein: the MCU (5) is used for setting protection parameters and external communication and performing front-end control.