CN219203293U

CN219203293U - Thermal runaway trigger device and battery cell

Info

Publication number: CN219203293U
Application number: CN202223529212.8U
Authority: CN
Inventors: 张爽; 刘昌辉; 袁园; 胡朝帅; 徐亚杰; 向新宇
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2022-12-27
Filing date: 2022-12-27
Publication date: 2023-06-16
Anticipated expiration: 2032-12-27

Abstract

The utility model provides a thermal runaway triggering device and a battery cell, wherein the thermal runaway triggering device comprises a device body arranged in the battery cell, the device body comprises two insulating films which are arranged oppositely, and a heating unit and a temperature measuring unit which are arranged between the two insulating films in a sealing way, the heating unit is used for providing heat for triggering thermal runaway, the temperature measuring unit is used for detecting the temperatures in the insulating films and the battery cell, and the heating unit and the temperature measuring unit are both in a sheet shape. According to the thermal runaway triggering device, the heating unit and the temperature measuring unit are arranged in the battery core, and are made to be sheet-shaped, so that the thermal runaway triggering device is convenient to arrange, small in occupied space and capable of realizing the triggering of the thermal runaway of the battery core under the condition of small energy introduction, and the temperature measuring unit can detect the temperature inside the battery core in real time, so that the heating power of the heating unit can be adjusted as required, and the thermal runaway triggering mode is simple and reliable.

Description

Thermal runaway trigger device and battery cell

Technical Field

The utility model relates to the technical field of batteries, in particular to a thermal runaway triggering device. Meanwhile, the utility model also relates to a battery cell provided with the thermal runaway triggering device.

Background

Electric automobiles are the most rapidly developing emerging industry in the new energy industry. However, the safety accident of the lithium ion battery system featuring thermal runaway occurs, which disturbs the development of electric vehicles, so the state of the art uses the thermal runaway test of the battery of the electric vehicle as the mandatory standard for checking the battery of the electric vehicle, and the thermal runaway triggering scheme is particularly important.

In the prior art, an external heating or needling method is mostly adopted to trigger the battery to generate thermal runaway. However, by the external heating method, the introduced energy is high, the internal volume of the battery pack is additionally occupied, the structure of the battery pack is changed to a certain extent, and the difference from the actual working condition is large. Although no external energy is introduced in the needling method, the integrity of a battery pack system is destroyed, an additional needling device is needed for triggering, and the needling method is complex and high in cost.

Disclosure of Invention

In view of the foregoing, the present utility model is directed to a thermal runaway trigger device, so as to make the thermal runaway trigger mode of the battery cell simpler and more reliable.

In order to achieve the above purpose, the technical scheme of the utility model is realized as follows:

a thermal runaway triggering apparatus, characterized by:

including locating the inside device body of electric core, the device body includes two insulating diaphragms of relative arrangement, and sealed locating two heating element and temperature measuring unit between the insulating diaphragms, heating element is used for providing the heat that triggers thermal runaway, temperature measuring unit is used for detecting insulating diaphragm with the inside temperature of electric core, just heating element with temperature measuring unit all is the slice.

Further, the heating unit adopts a heating wire, the thickness of the heating wire is between 0.05 and 0.15mm, and/or the resistance value of the heating wire is between 2 and 100 omega.

Further, the heating wire comprises a first part with an input end and a second part connected with the first part and provided with an output end; the first portion and the second portion each include a plurality of straight line segments arranged side by side, and an arc segment connecting between two adjacent straight line segments.

Further, the heating wire is connected with an external power supply through an electric connecting piece penetrating through the cover plate of the electric core, and the joint of the heating wire and the electric connecting piece is sealed through packaging glue.

Further, the joint with the packaging adhesive is sealed in the two insulating films.

Further, the electric connector adopts a wire, the wire is welded with the heating wire, and/or the wire is bonded with the heating wire.

Further, the thickness of the device body is less than 0.3mm.

Furthermore, the temperature measuring unit adopts a thermocouple.

Compared with the prior art, the utility model has the following advantages:

according to the thermal runaway triggering device, the heating unit and the temperature measuring unit are arranged in the battery core, and are made to be sheet-shaped, so that the thermal runaway triggering device is convenient to arrange, small in occupied space and capable of realizing the triggering of the thermal runaway of the battery core under the condition of small energy introduction, and the temperature measuring unit can detect the temperature inside the battery core in real time, so that the heating power of the heating unit can be adjusted as required, and the thermal runaway triggering mode is simple and reliable.

In addition, through sealing through the encapsulation glue in the junction of heater strip and electric connector, be convenient for make the junction of heater strip and electric connector protect, promote this thermal runaway trigger device's stability in use.

In addition, the thickness of the device body is smaller than 0.3mm, so that the device body is convenient to arrange in the battery cell.

Another object of the present utility model is to propose a cell in which a thermal runaway trigger device as described above is provided.

Further, a plurality of pole groups are arranged in the battery cell, the thermal runaway trigger device is arranged between two adjacent pole groups, and/or the thermal runaway trigger device is arranged at the bottom of each pole group along the height direction of the battery cell.

According to the battery cell, the thermal runaway triggering device is arranged, so that the thermal runaway of the battery cell can be triggered more simply and reliably, and the safety test of the battery cell is convenient to realize.

Drawings

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

fig. 1 is a schematic structural diagram of a thermal runaway trigger device according to an embodiment of the present utility model.

Reference numerals illustrate:

1. an insulating film; 2. a temperature measuring unit; 3. a heating wire; 301. a straight line segment; 302. a circular arc section; 303. an input end; 304. an output end; 4. a wire; 5. and (5) packaging glue.

Detailed Description

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other.

In the description of the present utility model, it should be noted that, if terms indicating an orientation or positional relationship such as "upper", "lower", "inner", "outer", etc. are presented, they are based on the orientation or positional relationship shown in the drawings, only for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, if any, are also used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Furthermore, in the description of the present utility model, the terms "mounted," "connected," and "connected," are to be construed broadly, unless otherwise specifically defined. For example, the connection can be fixed connection, detachable connection or integrated connection; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art in combination with specific cases.

The utility model will be described in detail below with reference to the drawings in connection with embodiments.

Example 1

The embodiment relates to a thermal runaway triggering device, on the whole constitution, this thermal runaway triggering device is including locating the inside device body of electric core, and the device body includes two insulating diaphragms 1 of relative arrangement to and sealed heating element and the temperature measurement unit 2 of locating between two insulating diaphragms 1, heating element is used for providing the heat that triggers thermal runaway, and temperature measurement unit 2 is used for detecting the inside temperature of insulating diaphragm 1 and electric core, and heating element and temperature measurement unit 2 all are the slice.

Through all setting up heating element and temperature measuring unit 2 into the slice, when being convenient for heating element and temperature measuring unit 2's the arrangement, through setting up heating element and temperature measuring unit 2 inside the electric core, then under the condition of introducing less energy, can touch the thermal runaway of electric core, the trigger mode is simple reliable, and through being provided with temperature measuring unit 2, is convenient for adjust heating element's power according to the temperature in the electric core.

Based on the above overall description, as a preferred embodiment, as shown in fig. 1, in this embodiment, the heating unit uses the heating wire 3, and the thickness of the heating wire 3 is between 0.05mm and 0.15mm, which may be specifically 0.05mm, 0.1mm, 0.13mm, 0.15mm, and the like. And as a further preferable, the resistance value of the heating wire 3 is between 2 to 100 Ω, which may be specifically 2 Ω, 50 Ω, 80 Ω, 100 Ω, etc. In addition, the heating material is one of high temperature resistant metals commonly used in the prior art, such as stainless steel, copper or iron-nickel alloy.

As also shown in fig. 1, the heating wire 3 comprises a first portion having an input end 303 and a second portion connected to the first portion having an output end 304. The first portion and the second portion each include a plurality of straight line segments 301 arranged side by side, and a circular arc segment 302 connecting between adjacent two of the straight line segments 301. By the arrangement form, the heating area of the heating wire 3 is convenient to be increased, so that a better heating effect is achieved. Of course, in addition to the above-described shape of the heating wire 3, the heating wire 3 may be provided in other shapes as required in the specific implementation.

As a further preference, in the present embodiment, the heating wire 3 is connected to an external power source through an electrical connector passing through the cover plate of the battery cell, and the connection between the heating wire 3 and the electrical connector is sealed by the encapsulation glue 5. In specific implementation, the material sense of the encapsulation adhesive 5 can be a high-temperature-resistant and electrolyte corrosion-resistant polymer material, such as one of organic silicon resin, polyvinyl alcohol and polyisobutylene adhesive, so as to protect the connection position of the heating wire 3 and the electric connecting piece and prevent the electrolyte from penetrating to the connection position of the heating wire 3 and the electric connecting piece, thereby causing adverse effects on the normal use of the heating wire 3.

Further, in this embodiment, the connection portion with the encapsulation glue 5 is sealed in the two insulating films 1, so that the connection position between the heating wire 3 and the electrical connector can be further protected by the insulating films 1.

In addition, the electric connector can adopt the lead 4, and the lead 4 is welded and bonded with the heating wire 3 so as to obtain better connection effect. Of course, the bonding and welding connection between the wire 4 and the heating wire 3 is only a preferred embodiment, and furthermore, the bonding connection may be only adopted or only adopted. It should be noted that, when the wire 4 is connected to the heating wire 3 by welding, a soldering method and the like commonly used in the prior art are adopted, and no description is repeated here.

As further preferred, in this embodiment, the thickness of the device body is less than 0.3mm, which may specifically be 0.1mm, 0.2mm, 0.25mm, 0.3mm, and the like, and by setting the thickness of the device body in the above range, the arrangement of the device body in the battery cell is facilitated, and the original structure of the battery cell does not need to be changed due to the arrangement of the device body, so that the device is more suitable for practical situations, and the triggering of thermal runaway of the battery cell is more reliable.

In addition, the temperature measuring unit 2 in the embodiment can adopt a thermocouple, so that the monitoring of the internal temperature of the battery cell can be realized while the structure is simple, and the power of an external power supply can be adjusted according to the requirement. It should be further noted that, in this embodiment, the insulating film 1 may be made of a material with a glass transition temperature greater than 300 ℃, such as one of liquid crystal polymers, polyaryletherketones (PAEKs), and polyimides, so that the two insulating films 1 may be packaged with the heating wire 3 at high temperature and high pressure.

According to the thermal runaway triggering device, the heating unit and the temperature measuring unit 2 are arranged in the battery cell, the heating unit and the temperature measuring unit 2 are in the shape of a sheet, the arrangement is convenient, the occupied space is small, the triggering of the thermal runaway of the battery cell can be realized under the condition of small introduced energy, the temperature measuring unit 2 can detect the temperature inside the battery cell, the heating power of the heating unit is adjusted as required, and the thermal runaway triggering mode is simple and reliable.

Example two

The present embodiment relates to a battery cell in which the thermal runaway trigger device of the first embodiment is provided.

In addition, be equipped with a plurality of polar groups in the electric core, thermal runaway trigger device locates between two adjacent polar groups. Of course, besides locating the thermal runaway trigger device between two pole groups, the thermal runaway trigger device can also be located at other positions in the battery core, for example, along the height direction of the battery core, the thermal runaway trigger devices are arranged at the bottoms of the pole groups, and the thermal runaway trigger device is convenient to arrange in specific implementation.

The battery cell of this embodiment through being provided with above thermal runaway trigger device, can more simple reliable trigger the thermal runaway of battery cell to be convenient for realize the security test to the battery cell.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims

1. A thermal runaway triggering apparatus, characterized by:

2. The thermal runaway trigger device of claim 1, wherein:

the heating unit adopts a heating wire, the thickness of the heating wire is between 0.05 and 0.15mm, and/or the resistance value of the heating wire is between 2 and 100 omega.

3. The thermal runaway trigger device of claim 2, wherein:

the heating wire comprises a first part with an input end and a second part with an output end, wherein the second part is connected with the first part;

the first portion and the second portion each include a plurality of straight line segments arranged side by side, and an arc segment connecting between two adjacent straight line segments.

4. The thermal runaway trigger device of claim 2, wherein:

the heating wire is connected with an external power supply through an electric connecting piece penetrating through the cover plate of the electric core, and the joint of the heating wire and the electric connecting piece is sealed through packaging glue.

5. The thermal runaway trigger device of claim 4, wherein:

the joint with the packaging adhesive is sealed in the two insulating films.

6. The thermal runaway trigger device of claim 5, wherein:

the electric connector adopts a wire, the wire is connected with the heating wire in a welding way, and/or the wire is connected with the heating wire in a bonding way.

7. The thermal runaway trigger device of claim 1, wherein:

the thickness of the device body is less than 0.3mm.

8. The thermal runaway trigger device according to any one of claims 1 to 7, characterized in that:

the temperature measuring unit adopts a thermocouple.

9. The utility model provides an electric core which characterized in that:

the thermal runaway trigger device according to any one of claims 1 to 8 is provided in the cell.

10. The cell of claim 9, wherein:

the battery cell is internally provided with a plurality of pole groups, the thermal runaway trigger device is arranged between two adjacent pole groups, and/or the thermal runaway trigger device is arranged at the bottom of each pole group along the height direction of the battery cell.