Thermal runaway safety protection battery system and vehicle

Abstract

The utility model belongs to the technical field of batteries, and discloses a thermal runaway safety protection battery system and a vehicle, the thermal runaway safety protection battery system comprises a shell, a plurality of battery cells, a heat insulation assembly and a detection assembly, the shell is provided with a cavity, the plurality of battery cells are arranged in the cavity, a liquid cooling plate is arranged on one side of the battery cells, and a heat insulation pad is arranged on the other side of the battery cells; the thermal diffusion condition after thermal runaway of the battery cell occurs can be isolated, so that the safety and reliability of the battery are improved, the detection sensor is installed on the shell, and when the battery cell is in thermal runaway, the detection sensor sends out battery cell thermal runaway alarm detection and feeds back an abnormal alarm signal to the control module; and the control module uploads the battery thermal runaway information to the vehicle controller in time to remind the vehicle of the battery thermal runaway fault, so that the battery energy density is improved, the battery thermal runaway safety performance is ensured, and the application requirement of the battery in the new energy vehicle is met.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to thermal runaway safety protection battery system and vehicle. BACKGROUND

[0002] Battery as one of the core parts of pure electric vehicle, its performance parameter directly influences the product quality of whole electric vehicle. The most core problem of battery is battery safety, namely battery thermal runaway safety, wherein ternary lithium (nickel cobalt manganese lithium) battery itself high energy density and high chemical activity characteristic, have very high safety risk problem.

[0003] The battery adopted by current new energy heavy truck is mostly ternary lithium ion battery standard box scheme, and the thermal management is divided into natural cooling or air cooling design, which cannot make ternary lithium ion battery maintain in comfortable working environment temperature, leads to battery thermal runaway diffusion, and poor safety reliability.

[0004] Therefore, the thermal runaway safety protection battery system and vehicle are urgently needed to solve the above problems. UTILITY MODEL CONTENTS

[0005] The utility model discloses a thermal runaway safety protection battery system can isolate the heat diffusion situation after the thermal runaway of battery cell occurs, guarantee the thermal runaway safety performance of battery.

[0006] In order to solve the above -mentioned problems existing in prior art, the utility model adopts the following technical scheme:

[0007] Thermal runaway safety protection battery system, comprising:

[0008] Shell, the shell has a cavity;

[0009] A plurality of battery cells, a plurality of the battery cells are arranged in the cavity;

[0010] Thermal insulation assembly, the thermal insulation assembly includes thermal insulation pad and liquid cooling plate, the liquid cooling plate is arranged on one side of the battery cell, the thermal insulation pad is arranged on the other side of the battery cell, and the liquid cooling plate and the thermal insulation pad are used to isolate the heat diffusion of the battery cell;

[0011] Detection assembly, the detection assembly includes detection sensor and control module electrically connected with the detection sensor, the detection sensor is installed on the shell, the detection sensor is used to detect whether the battery cell is thermal runaway, and the control module is used to send thermal runaway signal.

[0012] Preferably, the shell includes a box body and a box cover, the box body has the cavity, and the box cover is arranged on the opening of the box body, and the box cover is made of sheet metal material.

[0013] Preferably, the box cover is an integrally formed structure, and the box body is an integrally formed structure.

[0014] Preferably, the thermal runaway safety protection battery system further comprises an explosion-proof valve arranged in the box body, and the explosion-proof valve is used for discharging high-pressure gas in the shell.

[0015] Preferably, the thermal runaway safety protection battery system further comprises a fireproof blanket arranged between the box cover and the box body, and the fireproof blanket is arranged on the electric core.

[0016] Preferably, the thermal runaway safety protection battery system further comprises a mica plate arranged between the box cover and the fireproof blanket, and a fireproof interlayer is formed between the mica plate and the fireproof blanket, and the fireproof interlayer is used for accommodating high-temperature flames generated by the electric core.

[0017] Preferably, the number of the mica plates is multiple, and the multiple mica plates are sequentially connected along the length direction of the shell.

[0018] Preferably, the thermal insulation pad is made of aerogel material.

[0019] Preferably, the detection sensor is arranged as a smoke sensor.

[0020] To achieve the above-mentioned purpose, the utility model further provides a vehicle, including chassis, still includes above-mentioned thermal runaway safety protection battery system, the thermal runaway safety protection battery system installs on chassis.

[0021] The utility model has the advantages of:

[0022] The thermal runaway safety protection battery system has the advantages that the shell has a cavity, multiple electric cores are arranged in the cavity, the thermal insulation assembly includes a thermal insulation pad and a liquid cooling plate, the liquid cooling plate is arranged on one side of the electric core, and the thermal insulation pad is arranged on the other side of the electric core, so that the thermal diffusion after thermal runaway of the electric core can be isolated, thereby improving the safety and reliability of the battery. The detection assembly includes a detection sensor and a control module electrically connected with the detection sensor, the detection sensor is installed on the shell, the detection sensor is used for detecting whether the electric core is in thermal runaway, and the control module is used for sending a thermal runaway signal. When the electric core is in thermal runaway, the detection sensor sends an electric core thermal runaway alarm detection and feeds back an abnormal alarm signal to the control module, the control module timely uploads battery thermal runaway information to a vehicle controller, reminds that the vehicle has a battery thermal runaway fault, simultaneously, a battery system thermal management cooling liquid circulation system is started, active cooling of the battery is carried out, and the thermal runaway of the battery is controlled. While improving the energy density of the battery, the safety performance of the battery in thermal runaway is ensured, and the demand of the battery in new energy automobile application is met.

[0023] The vehicle provided by this utility model includes a chassis and a thermal runaway safety protection battery system, which is installed in the chassis. When a battery cell experiences thermal runaway, the heat insulation pad and liquid cooling plate can isolate the heat diffusion after thermal runaway, thereby improving the safety and reliability of the battery. At the same time, the detection sensor issues a thermal runaway alarm and feeds back the abnormal alarm signal to the control module. The control module then promptly uploads the battery thermal runaway information to the vehicle controller, alerting the vehicle to the occurrence of a battery thermal runaway fault and ensuring the battery's thermal runaway safety performance. Attached Figure Description

[0024] Fig. 1 A schematic diagram of the structure of the thermal runaway safety protection battery system provided in this embodiment of the utility model;

[0025] Fig. 2 An explosion diagram of a thermal runaway safety protection battery system provided in an embodiment of this utility model;

[0026] Fig. 3 This is a schematic diagram of the internal structure of the thermal runaway safety protection battery system provided in an embodiment of the present invention.

[0027] Figure label:

[0028] 1. Outer shell; 2. Battery cell; 3. Heat insulation pad; 4. Liquid cooling plate; 5. Box body; 6. Box cover; 7. Explosion-proof valve; 8. Fireproof blanket; 9. Mica board. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0030] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] In the utility model, unless another definite provision and limitation, first feature is in second feature "on" or "under" can include that first and second features are in direct contact, also can include that first and second features are not in direct contact but contact through other feature between them. Moreover, first feature is in second feature "on", "above" and "upper surface" include that first feature is in second feature directly above and obliquely above, or just indicate that first feature horizontal height is higher than second feature. First feature is in second feature "under", "below" and "under" include that first feature is in second feature directly below and obliquely below, or just indicate that first feature horizontal height is less than second feature.

[0032] In the description of the present embodiment, the terms "upper", "lower", "left", "right" and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0033] As Figs. 1-3As shown, in the embodiment, the thermal runaway safety protection battery system includes a shell 1, a plurality of battery cells 2, a heat insulation assembly, and a detection assembly. The shell 1 has a cavity, the plurality of battery cells 2 are arranged in the cavity, the heat insulation assembly includes a heat insulation pad 3 and a liquid cooling plate 4, the liquid cooling plate 4 is arranged on one side of the battery cell 2, the heat insulation pad 3 is arranged on the other side of the battery cell 2, and the liquid cooling plate 4 and the heat insulation pad 3 are used to isolate the heat diffusion of the battery cell 2. The detection assembly includes a detection sensor and a control module electrically connected with the detection sensor, the detection sensor is installed on the shell 1, the detection sensor is used to detect whether the battery cell 2 is in thermal runaway, and the control module is used to send a thermal runaway signal. The battery cell 2 selects a high-energy-density ternary lithium-ion square battery, the energy density of the battery cell 2 is 252 wh / kg, and the plurality of battery cells 2 are arranged in a matrix to form a battery module and are contained in the cavity of the shell 1. The two sides of the battery cell 2 are respectively fixedly provided with the heat insulation pad 3 and the liquid cooling plate 4 by welding or gluing and the like, the heat insulation pad 3 is made of aerogel material, the aerogel refers to a kind of nanometer porous solid material formed by replacing liquid phase in gel with gas by sol-gel method and a certain drying method. Such as gelatin, gum arabic, silica gel, hair, nails, etc., aerogel also has the properties of gel, that is, swelling, thixotropy, and deswelling. Based on the high-temperature resistance of the heat insulation pad 3 and the liquid cooling plate 4, the heat diffusion after the thermal runaway of the battery cell 2 can be isolated, thereby improving the safety and reliability of the battery. The detection sensor is set as a smoke sensor, which is used to detect whether the battery cell 2 is in thermal runaway state, and the control module is set as a BMS battery management system, which is commonly known as a battery nanny or a battery housekeeper. The main purpose is to intelligently manage and maintain each battery cell, monitor the state of the battery, prevent overcharging and overdischarging of the battery, and prolong the service life of the battery. When the battery cell 2 is in thermal runaway, the detection sensor sends a battery cell 2 thermal runaway alarm detection and feeds back an abnormal alarm signal to the control module, the control module timely uploads the battery thermal runaway information to the vehicle controller, reminds the vehicle of the battery thermal runaway fault, at the same time, opens the battery system thermal management cooling liquid circulation system, actively cools the battery, and controls the spread of the battery thermal runaway. While improving the energy density of the battery, the safety performance of the battery thermal runaway is ensured, and the demand of the battery in the new energy vehicle application is met.

[0034] Further, with reference to Figs. 1-3 , the shell 1 includes a box body 5 and a box cover 6, the box body 5 has a cavity, and the box cover 6 is arranged on the opening of the box body 5. The box cover 6 is made of sheet metal material. The box cover 6 is an integral forming structure, and the box body 5 is an integral forming structure. The box cover 6 adopts an integral forming cast aluminum structure with a thickness of 4.5 mm to ensure the reliability of the structural strength of the battery. The box cover 6 adopts an integral stamping sheet metal forming with a thickness of 0.7 mm. In the process of thermal runaway of the battery cell 2, the box cover 6 bears the heat of the battery and isolates the thermal runaway from spreading to the whole vehicle.

[0035] Further, with reference toFigs. 1-3 The thermal runaway safety protection battery system further comprises an explosion-proof valve 7 arranged in the box body 5, and the explosion-proof valve 7 is used for discharging high-pressure gas in the shell 1. The explosion-proof valve 7 is used in a dust removal system containing flammable gas or flammable substances, and can be used as a pressure relief device of an explosive pipeline or equipment. The diaphragm of the explosion-proof valve 7 is usually calculated according to the operating pressure of the dust removal system and the content of the flammable substances, and then the material and thickness of the diaphragm are selected. One explosion-proof valve 7 is arranged on each of the front and rear box bodies 5 of the battery, and the explosion-proof valve 7 is selected according to the gas generation rate of the thermal runaway of the battery cell 2 and the volume of the battery system. When the battery cell 2 triggers thermal runaway, the gas pressure in the shell 1 abnormally increases, and the explosion-proof valve 7 can be automatically opened to release the pressure in the battery, thereby preventing the battery system from exploding due to high pressure. Preferably, the battery cell 2 is designed with a large-area liquid cooling and liquid heating system to increase the contact area of the battery cell 2 and improve the heat exchange efficiency of the thermal management. Not only is the liquid heating system used for heating the battery in a low-temperature environment, but also the liquid cooling system is used for cooling the battery in a high-temperature environment. In addition, the liquid cooling cycle needs to be opened when thermal runaway occurs to take out the heat generated by the thermal runaway.

[0036] Further, with reference to Figs. 1-3 The thermal runaway safety protection battery system further comprises a fireproof blanket 8, which is located between the box cover 6 and the box body 5 and is arranged on the battery cell 2. The battery cell 2 is arranged with a layer of fireproof blanket 8 with a thickness of 1 mm, which has the characteristics of high temperature resistance and plays a role in heat insulation and protection of the battery cell 2.

[0037] Further, with reference to Figs. 1-3 The thermal runaway safety protection battery system further comprises a mica plate 9, which is located between the box cover 6 and the fireproof blanket 8 and forms a fireproof interlayer between the fireproof blanket 8 and the mica plate 9, and the fireproof interlayer is used for accommodating high-temperature flames generated by the battery cell 2. The mica plate 9 is an insulating material made of mica paper and organic silicone glue, which is bonded, heated and pressed. The mica content is about 90%, and the organic silicone glue content is 10%. The mica plate 9 has excellent insulation performance and high temperature resistance, and can withstand a temperature of 500-750°C, and still maintains its performance at high temperatures. The fireproof blanket 8 is arranged with a layer of mica plate 9 with a thickness of 2 mm, which has the performance of high strength impact resistance and high temperature resistance. There are multiple mica plates 9, which are connected in sequence along the length direction of the shell 1. The fireproof interlayer is formed between the fireproof blanket 8 and the mica plate 9, and the high-temperature flames generated by the thermal runaway of the battery cell 2 are controlled in the fireproof interlayer, thereby achieving high-temperature protection of the battery components.

[0038] The embodiment also provides a vehicle, comprising a chassis and the thermal runaway safety protection battery system, and the thermal runaway safety protection battery system is installed on the chassis. When the battery cell 2 is in thermal runaway, the heat insulation pad 3 and the liquid cooling plate 4 can isolate the heat diffusion after the thermal runaway of the battery cell 2, so that the safety reliability of the battery is improved, meanwhile, the detection sensor sends the thermal runaway alarm detection of the battery cell 2 and feeds back the abnormal alarm signal to the control module, the control module timely uploads the thermal runaway information of the battery to the vehicle controller, the vehicle is reminded to appear the battery thermal runaway fault, and the safety performance of the battery thermal runaway is ensured.

[0039] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not the limitation of the embodiments of the utility model. For ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be carried out without departing from the protection scope of the utility model. Here, all the embodiments cannot be exhausted. Any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A thermal runaway safety protected battery system, characterized in that, include: The outer casing (1) has a cavity; Multiple battery cells (2) are disposed within the cavity; A heat insulation assembly, comprising a heat insulation pad (3) and a liquid cooling plate (4), wherein the liquid cooling plate (4) is disposed on one side of the battery cell (2) and the heat insulation pad (3) is disposed on the other side of the battery cell (2), and the liquid cooling plate (4) and the heat insulation pad (3) are used to isolate the heat diffusion of the battery cell (2); The detection component includes a detection sensor and a control module electrically connected to the detection sensor. The detection sensor is mounted on the housing (1) and is used to detect whether the battery cell (2) is thermally runaway. The control module is used to send a thermal runaway signal.

2. The thermal runaway safety shielded battery system of claim 1, wherein, The outer casing (1) includes a box body (5) and a box cover (6). The box body (5) has the cavity, and the box cover (6) covers the opening of the box body (5). The box cover (6) is made of sheet metal.

3. The thermal runaway safety shielded battery system of claim 2, wherein, The lid (6) is a one-piece molded structure, and the body (5) is a one-piece molded structure.

4. The thermal runaway safety shielded battery system of claim 2, wherein, The thermal runaway safety protection battery system also includes an explosion-proof valve (7), which is installed in the housing (5) and is used to discharge high-pressure gas inside the housing (1).

5. The thermal runaway safety shielded battery system of claim 2, wherein, The thermal runaway safety protection battery system also includes a fire blanket (8), which is located between the cover (6) and the box body (5) and is laid on the battery cell (2).

6. The thermal runaway safety shielded battery system of claim 5, wherein, The thermal runaway safety protection battery system also includes a mica plate (9), which is located between the box cover (6) and the fireproof blanket (8), and a fireproof interlayer is formed between the mica plate (9) and the fireproof blanket (8), which is used to contain the high temperature flame generated by the battery cell (2).

7. The thermal runaway safety shielded battery system of claim 6, wherein, There are multiple mica plates (9), which are connected sequentially along the length of the outer shell (1).

8. The thermal runaway safety shield battery system of claim 1, wherein, The heat insulation pad (3) is made of aerogel material.

9. The thermal runaway safety shield battery system of claim 1, wherein, The detection sensor is set as a smoke sensor.

10. Vehicle comprising a chassis, characterised in that It also includes the thermal runaway safety protection battery system according to any one of claims 1-9, wherein the thermal runaway safety protection battery system is installed on the chassis.

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