Thermal safety lithium battery pack system

Abstract

The utility model discloses a thermal safety lithium battery pack system, which is characterized in that a plurality of lithium battery pack systems are arranged in a power cabinet, and each lithium battery pack system comprises a box body, a man-machine interaction unit, and a battery cell, a lithium battery thermal runaway detector, a fire fighting device, a BMS (Battery Management System) and a ceramic fiber aerogel heat insulation device which are arranged in the box body, the plurality of lithium battery pack systems share one man-machine interaction unit, and the man-machine interaction unit is arranged on a cabinet door of the power cabinet and electrically connected to the BMS; the plurality of battery cells are fixed on a battery cell frame in the box body and are electrically connected to the BMS; a ceramic fiber aerogel heat insulation device is also arranged between the battery cells; the lithium battery thermal runaway detector is electrically connected to the BMS; the fire fighting device is electrically connected to the BMS; the BMS can realize the functions of battery voltage, current and cell temperature monitoring, energy balance, electric quantity display, abnormity alarm, charge and discharge management and communication. Therefore, according to the utility model, when thermal runaway of the battery cell occurs, the BMS automatically judges abnormity, and actively gives an alarm or directly executes fire-fighting action.

Description

Technical Field

[0001] The utility model relates to the technical field of battery safety, in particular to a thermal safety lithium battery pack system. Background Art

[0002] Currently, the lithium battery pack systems on the market mainly include one or more lithium batteries or battery cell modules, a battery management system (BMS), and battery protection devices such as fuses or positive temperature coefficient thermistors; however, the thermal safety management of the battery pack is limited to: voltage monitoring, current monitoring and / or temperature monitoring.

[0003] Therefore, when a battery cell in the battery pack system experiences thermal runaway, the occurrence of thermal runaway cannot be monitored in a timely and effective manner, and thus early warning information cannot be issued in advance, and heat diffusion between battery cells cannot be effectively prevented, resulting in large-scale thermal runaway of the battery pack.

[0004] Therefore, there is an urgent need in the art for a thermally safe lithium battery pack system that can monitor multiple parameters of the lithium battery pack in real time while ensuring safe and stable operation, so as to timely and effectively monitor the occurrence of thermal runaway, and then respond to ensure the safety of the lithium battery pack system. Summary of the invention

[0005] In order to overcome the defects of the prior art, the technical problem to be solved by the present invention is: how to monitor multiple parameters of a lithium battery pack in real time and then respond to ensure the safety of the lithium battery pack system.

[0006] In order to solve the above technical problems, the utility model provides a thermal safety lithium battery pack system, wherein a plurality of thermal safety lithium battery pack systems are arranged in a power supply cabinet, including a box body, a human-machine interaction unit, and the following components arranged in the box body: a battery cell, a lithium battery thermal runaway detector, a fire fighting device, a BMS and a ceramic fiber aerogel insulation device; wherein,

[0007] A plurality of thermal safety lithium battery pack systems share one human-machine interaction unit, and the human-machine interaction unit is arranged on the door of the power cabinet and electrically connected to the BMS;

[0008] There are multiple battery cells, which are fixed on a battery cell rack in the box and electrically connected to the BMS; the ceramic fiber aerogel insulation device is also provided between the battery cells;

[0009] The lithium battery thermal runaway detector is electrically connected to the BMS;

[0010] The fire fighting device is electrically connected to the BMS;

[0011] The functions that can be realized by the BMS include but are not limited to: monitoring of battery voltage, current and cell temperature, energy balancing, power display, abnormal alarm, charge and discharge management and communication.

[0012] On the basis of the above technical solution, the present invention can also be improved as follows.

[0013] Preferably, the battery cell, the lithium battery thermal runaway detector, the human-machine interaction unit and the fire-fighting device are respectively connected to the BMS via a communication harness.

[0014] Preferably, the ceramic fiber aerogel thermal insulation device is: a ceramic fiber aerogel sheet, a ceramic fiber aerogel felt, a ceramic fiber aerogel blanket or a ceramic fiber aerogel pad, or a combination of several of them.

[0015] Preferably, the lithium battery thermal runaway detector is a composite detector that can perform CO monitoring, flammable and explosive volatile gas monitoring and temperature monitoring.

[0016] Preferably, the fire-fighting device is a thermal aerosol fire-extinguishing device.

[0017] Preferably, the human-computer interaction unit is a combination of a display screen and operation buttons.

[0018] Preferably, the human-computer interaction unit is a touch screen.

[0019] Preferably, the human-computer interaction unit is also provided with an audible and visual alarm module for giving audible and visual alarms when the BMS detects a system abnormality.

[0020] Preferably, the box body also includes a detachable rear box cover.

[0021] Compared with the prior art, the utility model can produce the following beneficial technical effects:

[0022] (1) The utility model uses the battery cell as the protection unit and arranges a ceramic fiber aerogel thermal insulation device between the battery cells, which can not only isolate the heat diffusion between the battery cells, but also has flame retardant properties, avoiding or delaying the problem of battery cells burning and catching fire in the case of thermal runaway;

[0023] (2) The utility model arranges a composite lithium battery thermal runaway detector in the box, which can monitor CO, flammable and explosive volatile gases and temperature, providing a comprehensive judgment basis for thermal safety management;

[0024] (3) The utility model is also equipped with a fire-fighting device. Once a battery cell experiences thermal runaway, the BMS obtains signals from the battery cell itself and / or the lithium battery thermal runaway detector, and then actively issues an alarm or directly executes a fire-fighting action, providing a stable and reliable backup guarantee for the daily operation and use of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 This is a schematic diagram of the structure of the thermal safety lithium battery pack system of the utility model;

[0027] In the accompanying drawings, the component names represented by the reference numerals are listed as follows:

[0028] 1: Box, 2: Human-machine interaction unit, 3: Battery cell, 4: Lithium battery thermal runaway detector, 5: Fire fighting device, 6: BMS, 7: Ceramic fiber aerogel insulation device. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] Please refer to Figure 1 As shown, it is a schematic diagram of the structure of the thermal safety lithium battery pack system of the utility model; in the utility model, a plurality of thermal safety lithium battery pack systems are arranged in a power cabinet, and the thermal safety lithium battery pack system includes a box 1, a human-machine interaction unit 2, and arranged in the box 1: a battery cell 3, a lithium battery thermal runaway detector 4, a fire protection device 5, a BMS 6 and a ceramic fiber aerogel insulation device 7, wherein,

[0031] A plurality of the thermally safe lithium battery pack systems share one human-machine interaction unit 2, and the human-machine interaction unit 2 can be arranged on the cabinet door of the power cabinet, but is not limited thereto; the human-machine interaction unit 2 can be a combination of a display screen and operation buttons, or a touch screen; the human-machine interaction unit 2 is electrically connected to the BMS 6, thereby obtaining and displaying a plurality of parameters in the cabinet; further preferably, an audible and visual alarm module is also provided in the human-machine interaction unit 2, which is used to give an audible and visual alarm when the BMS detects a system abnormality.

[0032] There are multiple battery cells 3, eight of which are shown in the figure. In practice, the required number can be set according to the needs of the user. Multiple battery cells are fixed on the battery cell rack in the box body 1; the ceramic fiber aerogel insulation device 7 is provided between the battery cells, and the ceramic fiber aerogel insulation device 7 can be: one or a combination of ceramic fiber aerogel sheets, ceramic fiber aerogel felts, ceramic fiber aerogel blankets or ceramic fiber aerogel pads, which can not only isolate the heat diffusion between the battery cells, but also have flame retardant properties, avoiding or delaying the problem of battery cells burning and catching fire in the case of thermal runaway; preferably, in order to facilitate the inspection of battery cells or rescue in case of thermal runaway, the box body 1 also includes a detachable rear box cover.

[0033] The lithium battery thermal runaway detector 4 is a composite detector that can perform CO monitoring, flammable and explosive volatile gas monitoring, and temperature monitoring.

[0034] The fire-fighting device 5 is preferably a thermal aerosol fire-extinguishing device, but is not limited thereto.

[0035] The BMS 6 is arranged in the box 1, and can realize the functions of monitoring the battery voltage, current and battery cell temperature, energy balancing, power (SOC) display, abnormal alarm, charge and discharge management and communication; if overcharging, overcurrent, overdischarge or overheating occurs, the BMS 6 will perform corresponding operations; the battery cell 3, the lithium battery thermal runaway detector 4, the human-computer interaction unit 2 and the fire-fighting device 5 are respectively connected to the BMS 6 through a communication harness, wherein the BMS 6 monitors and transmits various parameters such as the voltage, current, power, charging status, etc. of the battery cell 3 to the human-computer interaction unit 2 through the communication harness, and at the same time, the BMS 6 monitors and transmits the gas, pressure, temperature and other data detected by the lithium battery thermal runaway detector 4 to the human-computer interaction unit 2 through the communication harness, and the BMS 6 makes a judgment based on the received information and then performs a corresponding operation.

[0036] The working principle of the utility model is as follows:

[0037] 1) If the BMS determines that it is a warning period, the following operations are performed: a warning screen is displayed on the human-computer interaction unit, or an audible and visual alarm is sounded, and the charging circuit of the battery cell is cut off at the same time;

[0038] 2) If the BMS determines that it is an alarm period, the following operations are performed: a warning screen is displayed on the human-computer interaction unit, an audible and visual alarm is sounded, and the charging circuit of the battery cell is cut off at the same time;

[0039] 3) If the BMS determines that it is an open flame period, the following operations are performed: a warning screen is displayed on the human-machine interaction unit, and an audible and visual alarm is sounded, and at the same time, the charging and discharging circuits of the battery cells are cut off and the fire fighting device is started to cool down the cabinet and extinguish the fire.

[0040] Therefore, the utility model can detect and alarm the thermal runaway of lithium batteries more accurately and earlier, and can effectively prevent the heat diffusion between the battery cells when thermal runaway occurs, avoiding or delaying the problem of battery cells burning and catching fire in the case of thermal runaway; it can also control the on and off of the charging circuit and the discharging circuit accordingly, and the linkage with the fire protection system, which greatly improves the safety of the use of lithium battery packs and greatly protects the personal safety and property safety of relevant personnel.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A thermally safe lithium battery pack system, wherein a plurality of thermally safe lithium battery pack systems are arranged in a power cabinet, characterized in that: It includes a box, a human-machine interaction unit, and the following components arranged in the box: a battery cell, a lithium battery thermal runaway detector, a fire fighting device, a BMS and a ceramic fiber aerogel insulation device; wherein, A plurality of thermal safety lithium battery pack systems share one human-machine interaction unit, and the human-machine interaction unit is arranged on the door of the power cabinet and electrically connected to the BMS; There are multiple battery cells, which are fixed on a battery cell rack in the box and electrically connected to the BMS; the ceramic fiber aerogel insulation device is also provided between the battery cells; The lithium battery thermal runaway detector is electrically connected to the BMS; The fire fighting device is electrically connected to the BMS; The functions that can be realized by the BMS include but are not limited to: monitoring of battery voltage, current and cell temperature, energy balancing, power display, abnormal alarm, charge and discharge management and communication.

2. The thermally safe lithium battery pack system according to claim 1, characterized in that: The battery cell, the lithium battery thermal runaway detector, the human-machine interaction unit and the fire-fighting device are respectively connected to the BMS via a communication harness.

3. The thermally safe lithium battery pack system according to claim 1 or 2, characterized in that: The ceramic fiber aerogel heat insulation device is: a ceramic fiber aerogel sheet, a ceramic fiber aerogel felt, a ceramic fiber aerogel blanket or a ceramic fiber aerogel pad, or a combination of several of them.

4. The thermally safe lithium battery pack system according to claim 1 or 2, characterized in that: The lithium battery thermal runaway detector is a composite detector that can perform CO monitoring, flammable and explosive volatile gas monitoring, and temperature monitoring.

5. The thermally safe lithium battery pack system according to claim 1 or 2, characterized in that: The fire-fighting device is a thermal aerosol fire-extinguishing device.

6. The thermally safe lithium battery pack system according to claim 1, characterized in that: The human-computer interaction unit is a combination of a display screen and operation buttons.

7. The thermally safe lithium battery pack system according to claim 1, characterized in that: The human-computer interaction unit is a touch screen.

8. The thermally safe lithium battery pack system according to claim 6 or 7, characterized in that: The human-machine interaction unit is also provided with an audible and visual alarm module, which is used to give audible and visual alarm when the BMS detects a system abnormality.

9. The thermally safe lithium battery pack system according to claim 1, characterized in that: The box body also includes a detachable rear box cover.

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