CN205900735U - Lithium-ion power battery protection device - Google Patents

Abstract

The embodiment of the utility model discloses a lithium ion power battery protection device, which relates to the technical field of lithium battery protection. The device includes: at least two protective plates, which are electrically connected to a set number of battery packs respectively, and are used to manage the state of the connected battery packs, wherein the set number is less than the set number of battery packs in the lithium battery. total number of . The lithium-ion power battery protection device provided by the embodiment of the utility model realizes the modular management of the battery cell group, thereby solving the problems of easy wrong connection, low production efficiency, and inconvenient maintenance.

Description

Lithium-ion power battery protection device

technical field

The embodiment of the utility model relates to lithium battery protection technology, in particular to a lithium ion power battery protection device.

Background technique

Due to the advantages of small size, light weight, high voltage, high power, less self-discharge and long service life, lithium battery packs have gradually become the mainstream of power batteries. Among them, a plurality of batteries are connected in parallel or in series to form a battery pack, and a plurality of battery packs are connected in series or in parallel and put into a battery box to form a lithium battery. The battery management system is connected to each battery pack through a detection line to manage the state of the battery.

Because, usually, the number of battery packs in a lithium battery is about 100 or more, and all detection lines connecting the battery pack and the battery management system must be wired when the batteries are assembled into the battery box. Therefore, it is easy to cause wrong wiring, low production efficiency, and inconvenient maintenance.

Utility model content

The embodiment of the utility model provides a lithium-ion power battery protection device to realize the modular management of the battery pack, so as to solve the problems of easy wrong connection, low production efficiency and inconvenient maintenance.

In the first aspect, the embodiment of the utility model provides a lithium-ion power battery protection device, which is set in the lithium battery, and the device includes:

At least two protective plates are respectively electrically connected to a set number of battery packs for managing the state of the connected battery packs, wherein the set number is less than the total number of battery packs in the lithium battery.

Further, the protective plate includes:

The sampling unit is electrically connected to the set number of battery packs, and is used to sample the battery information data of the connected battery packs;

The control unit is electrically connected with the sampling unit, and is used for managing the state of the battery pack according to the collected battery information data of the battery pack.

Further, the sampling unit includes:

The voltage sampling circuit is used to collect the voltage data of the connected cell pack in real time;

The temperature sampling circuit is used to collect the temperature data of the connected battery pack in real time.

Further, the control unit includes:

The charging and discharging protection circuit is electrically connected to the voltage sampling circuit, and is used to shut down the battery pack when it is detected that the voltage of any connected battery pack is inconsistent with the voltage of other battery packs;

The temperature protection circuit is electrically connected to the temperature sampling circuit, and is used to shut down the battery pack when it detects that the temperature of any connected battery pack is higher than the set threshold;

A protection cancellation circuit, electrically connected to the voltage sampling circuit and the temperature sampling circuit, is used to turn on the battery when it is detected that the voltage of the closed battery pack is consistent with the voltage of other battery packs and the temperature is lower than the set threshold The battery pack.

Further, the control unit also includes an overcharge protection circuit and an overdischarge protection circuit.

Further, the control unit includes a MOS transistor as a switching device of the battery pack.

Further, the device also includes:

The communication unit is electrically connected with the control unit and used for data communication with the control unit.

Further, the device also includes:

The battery management system is electrically connected with the protection board and is used to manage the charge and discharge state of the entire lithium battery.

Further, the lithium battery is a special lithium ion power battery for automobiles.

In the embodiment of the utility model, a plurality of protective plates are added in the lithium battery, which are respectively electrically connected with a set number of battery packs, and are used for modular management of the states of the battery packs in the lithium battery. Thereby solving the problems of wrong connection, low production efficiency and inconvenient maintenance caused by the large number of battery packs when all the battery packs in the lithium battery are directly connected to the battery management system.

Description of drawings

Fig. 1 is a schematic structural diagram of a lithium-ion power battery protection device provided in Embodiment 1 of the present invention;

Fig. 2 is a schematic structural view of a protective plate provided in Embodiment 2 of the present invention;

Fig. 3 is a schematic structural diagram of a battery module provided in Embodiment 2 of the present invention.

detailed description

Below in conjunction with accompanying drawing and embodiment the utility model is described in further detail. It can be understood that the specific embodiments described here are only used to explain the utility model, rather than limit the utility model. In addition, it should be noted that, for the convenience of description, only some structures related to the present utility model are shown in the drawings but not all structures.

Embodiment one

Fig. 1 is a schematic structural diagram of a protection device for a lithium-ion power battery provided in Embodiment 1 of the present utility model. This embodiment is applicable to the situation of modularized management of the battery pack in the lithium battery. Referring to FIG. 1 , the lithium-ion power battery protection device 10 provided in this embodiment is set in the lithium battery 01 and includes: at least two protection plates 110 .

Wherein, the protection board 110 is electrically connected with a set number of battery packs 120 respectively, and is used to manage the state of the connected battery packs 120, wherein the set number is less than the set number of battery packs 120 in the lithium battery 01. The total quantity, the set quantity can be one or more. Specifically, the state of the battery pack 120 may include at least one of a charge state, a discharge state, a temperature state, an overcharge protection state, and an overdischarge protection state of the battery pack 120 .

For example, a lithium battery includes 100 battery packs, and every 10 battery packs are connected to a protective board. Such a lithium battery contains 10 protection boards, and each protection board manages the state of the 10 battery packs connected to it.

The technical solution provided by this embodiment is to add a plurality of protective plates in the lithium battery, and respectively electrically connect with a set number of battery packs, and is used for modular management of the state of the battery packs in the lithium battery. Thereby solving the problems of wrong connection, low production efficiency and inconvenient maintenance caused by the large number of battery packs when all the battery packs in the lithium battery are directly connected to the battery management system.

In order to manage and monitor the status of the entire lithium battery, the lithium-ion power battery protection device provided in this embodiment may further include a battery management system.

Wherein, the battery management system is electrically connected with the protection board, and is used to manage at least one of the charge state, discharge state, temperature state, overcharge protection state, and overdischarge protection state of the entire lithium battery.

Further, the lithium battery may be a lithium-ion power battery dedicated to automobiles.

Embodiment two

Fig. 2 is a schematic structural diagram of a protective plate provided in Embodiment 2 of the present invention. This embodiment is optimized on the basis of the foregoing embodiments. Referring to FIG. 2 , the protection board in this embodiment may include: a sampling unit 111 and a control unit 112 .

Wherein, the sampling unit 111 is electrically connected to the set number of battery packs, and is used to sample the battery information data of the connected battery packs; the control unit 112 is electrically connected to the sampling unit, and is used to Based on the collected battery information data of the battery pack, the state of the battery pack is managed. Specifically, the sampling unit 111 can set the sampling period of the battery information data of the connected battery pack as required, and can also sample the battery information data of the connected battery pack in real time.

In the technical solution of this embodiment, the battery information data of the set number of battery packs is sampled by the sampling module, and the control module manages the states of the set number of battery packs according to the sampled battery information data . In this way, the modular sampling and state management of the battery pack in the lithium battery can be realized.

Further, the sampling unit may include: a voltage sampling circuit and a temperature sampling circuit.

Wherein, the voltage sampling circuit is used to collect the voltage data of the connected battery pack in real time; the temperature sampling circuit is used to collect the temperature data of the connected battery pack in real time. The temperature sampling circuit may include a temperature sensor for collecting the temperature of the battery pack. Specifically, the temperature sensor may be a thermal resistance temperature sensor, or a thermocouple temperature sensor.

Further, the control unit may include: a charging and discharging protection circuit, a temperature protection circuit and a protection revocation circuit.

Wherein, the charging and discharging protection circuit is electrically connected with the voltage sampling circuit, and is used to shut down the battery pack when it is detected that the voltage of any connected battery pack is inconsistent with the voltage of other battery packs.

The temperature protection circuit is electrically connected with the temperature sampling circuit, and is used for shutting down the battery pack when it detects that the temperature of any connected battery pack is higher than a set threshold.

A protection cancellation circuit, electrically connected to the voltage sampling circuit and the temperature sampling circuit, is used to turn on the battery when it is detected that the voltage of the closed battery pack is consistent with the voltage of other battery packs and the temperature is lower than the set threshold The battery pack.

Specifically, the device used to turn on and off the battery pack may be a transistor or a MOS transistor. From the perspective of the flexibility of the switch control and the stability of the application environment, it is preferable to use a MOS transistor as the switching device of the control unit.

In order to realize the overcharge and overdischarge protection of the connected battery pack, the control unit may further include an overcharge protection circuit and an overdischarge protection circuit. Those skilled in the art can understand that there are many kinds of overcharge protection circuits and overdischarge protection circuits in the prior art, which are not limited in this embodiment.

In order to realize data communication between modules, the device described in this embodiment further includes: a communication unit.

Wherein, the communication unit is electrically connected with the control unit and used for data communication with the control unit. In order to manage the state of the entire lithium battery, the state management information of the protection board to the connected battery pack can be sent to the battery management system through the communication unit. Specifically, the communication unit may be a wireless communication unit or a wired communication unit. In the case of a wireless communication unit, the wireless communication unit may include an antenna for receiving signals and transmitting signals, an encoder for encoding transmitted signals, and a decoder for decoding received signals. If it is a wired communication unit, the wired communication unit may include a signal line for transmitting signals, preferably a cable for easy connection.

Fig. 3 is a schematic structural diagram of a battery module provided in Embodiment 2 of the present invention. Referring to FIG. 3 , in order to facilitate the management and maintenance of the battery pack, the protective plate 110 and a set number of battery packs 120 connected thereto are integrated as a battery module 20 , and a lithium battery can be composed of multiple battery modules 20 .

Note that the above are only preferred embodiments of the present invention and the applied technical principles. Those skilled in the art will understand that the utility model is not limited to the specific embodiments described here, and various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the utility model. Therefore, although the utility model has been described in detail through the above embodiments, the utility model is not limited to the above embodiments, and can also include more other equivalent embodiments without departing from the concept of the utility model. The scope of the present invention is determined by the appended claims.

Claims (9)

1. a kind of lithium-ion-power cell protection device, is arranged in lithium battery it is characterised in that including:

At least two protection boards, are electrically connected with the battery core group setting quantity, respectively for the state to the battery core group being connected It is managed, wherein, described setting quantity is less than the total quantity of battery core group in lithium battery.

2. device according to claim 1 is it is characterised in that described protection board includes:

Sampling unit, is electrically connected with the described battery core group setting quantity, for the battery information number to the battery core group being connected According to being sampled；

Control unit, is electrically connected with described sampling unit, for the battery information data of the battery core group according to collection, to described The state of battery core group is managed.

3. device according to claim 2 is it is characterised in that described sampling unit includes:

Voltage sampling circuit, the voltage data of the battery core group being connected for Real-time Collection；

Temperature sampling circuit, the temperature data of the battery core group being connected for Real-time Collection.

4. device according to claim 3 is it is characterised in that described control unit includes:

Charge-discharge protection circuit, is electrically connected with described voltage sampling circuit, detects, for working as, the arbitrary battery core group being connected When voltage is inconsistent with other battery core group voltages, close this battery core group；

Temperature protection circuit, is electrically connected with described temperature sampling circuit, detects, for working as, the arbitrary battery core group temperature being connected When degree is higher than given threshold, close this battery core group；

Protection revocation circuit, is electrically connected with described voltage sampling circuit and described temperature sampling circuit, detects for working as The voltage closing battery core group is consistent with other battery core group voltages, and when temperature is less than given threshold, opens this battery core group.

5. device according to claim 4 is it is characterised in that described control unit also includes additives for overcharge protection circuit and mistake Discharge protection circuit.

6. device according to claim 4 is it is characterised in that described control unit is included as battery core group switching device Mos manages.

7. device according to claim 2 is it is characterised in that also include:

Communication unit, is electrically connected with described control unit, for entering row data communication to described control unit.

8. device according to claim 1 is it is characterised in that also include:

Battery management system, is electrically connected with described protection board, for being managed to the charging and discharging state of whole lithium battery.

9. device according to claim 1 is it is characterised in that described lithium battery is automobile specified lithium-ion-power cell.