Fixing device for battery thermal runaway test

Abstract

The utility model discloses a battery thermal runaway test fixing device which comprises a supporting framework, a first thermal insulation plate, a second thermal insulation plate, a fixing assembly and an elastic abutting assembly, and a first fixing end and a second fixing end are arranged at the two ends of the supporting framework respectively. The first heat insulation plate and the second heat insulation plate are arranged between the first fixed end and the second fixed end at an interval and can define a fixed space for clamping a battery. The fixing assembly is connected with the first heat insulation plate and the first fixing end and used for fixedly supporting the first heat insulation plate. The elastic abutting assembly is connected with the second heat insulation plate and the second fixing end. The elastic abutting assembly comprises a first pressure spring and a second pressure spring. The first pressure spring and the second pressure spring are both arranged between the second heat insulation plate and the second fixed end, so that the battery can have enough space for expansion during thermal runaway, and meanwhile, due to the elastic effect of the pressure springs, the second heat insulation plate can rebound and cannot be damaged when the battery is out of control, and the battery can be repeatedly used.

Description

Technical Field

[0001] The utility model relates to the technical field of battery testing, in particular to a battery thermal runaway testing fixture. Background Art

[0002] Lithium-ion battery thermal runaway test can effectively evaluate the safety of lithium-ion batteries. There are many ways to fix the battery in the thermal runaway test. At present, in the adiabatic temperature rise thermal runaway, lateral heating thermal runaway, and electrical abuse thermal runaway experiments, the battery is hoisted and clamped with a clamp.

[0003] At present, the electrolyte and electrodes of lithium-ion batteries will produce a large amount of gas during thermal runaway. The generated gas causes the battery shell to expand. The way of fixing the battery with a splint will hinder the expansion of the shell, and the occurrence of thermal runaway in advance is different from the actual performance of the battery. At the same time, the splint fixing method will produce irreversible deformation after the battery runs out of control, which will affect the accuracy of subsequent tests. The cost of the solution of frequently replacing the splint will increase. In the adiabatic temperature rise thermal runaway test, the ordinary splint fixing method will increase the contact between the battery and the outside world, accelerate the heat exchange and affect the accuracy of the battery's self-generated heat temperature test. At present, the adiabatic thermal runaway uses a hoisting method to fix the battery. The hoisting device will also generate a binding force on the battery and accelerate the occurrence of thermal runaway. The hoisting device is generally damaged after the battery runs out of control, and the failure of the battery cell to fix it will cause greater damage to the data acquisition device. At the same time, in the existing fixing method, the test device cannot protect the data acquisition line; in view of this, it is necessary to provide a lithium-ion battery thermal runaway test fixture. Utility Model Content

[0004] In order to overcome the above shortcomings, the purpose of the present invention is to provide a battery thermal runaway test fixture to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is a battery thermal runaway test fixture, comprising:

[0006] The supporting frame is provided with a first fixed end and a second fixed end at two ends along the first direction respectively.

[0007] The first heat insulation board and the second heat insulation board are both extended along the second direction and are spaced apart between the first fixed end and the second fixed end along the first direction, so as to enclose a fixed space for clamping the battery.

[0008] A fixing assembly is respectively connected to the first heat insulation board and the first fixing end, and is used for fixing and supporting the first heat insulation board.

[0009] An elastic abutment assembly is respectively connected to the second heat insulation board and the second fixed end. The elastic abutment assembly includes a first pressure spring and a second pressure spring. The first pressure spring and the second pressure spring both extend along the first direction and are arranged between the second heat insulation board and the second fixed end along the third direction, and are used to enable the second heat insulation board to be elastically pressed against the battery along the first direction through the elastic force of the first pressure spring and the second pressure spring, and the first direction, the second direction and the third direction are perpendicular to each other.

[0010] The battery thermal runaway test fixture provided by the utility model uses a support frame as a fixing base, assembles various components of the tool, and uses a pressure spring and a first insulation board and a second insulation board to clamp and fix the battery. The insulation board is made of insulation material, such as polyethylene, polypropylene, natural rubber, etc., and can make it easier for the test instrument to track the heat generation of the battery in the test experiment of reducing battery heat exchange or making the battery in adiabatic temperature rise, while taking into account the role of fixing the battery. The thermal runaway of the battery usually includes electrical abuse and thermal abuse, and the setting of the first pressure spring and the second pressure spring can allow the battery to have enough space to expand when it is thermally runaway. At the same time, due to the elastic effect of the pressure spring, the second insulation board can rebound when the battery is out of control, without damage, and can be reused.

[0011] In some embodiments, the fixing assembly includes a first fixing rod and a second fixing rod. The first fixing rod and the second fixing rod both extend along the first direction and are spaced apart along the third direction. One end of the first fixing rod and the second fixing rod is fixed to the first fixing end, and the other end is passed through the first heat insulation board.

[0012] By adopting the above technical solution, the first heat insulation board is fixed to the first fixed end through the first fixed rod and the second fixed rod. The first fixed rod and the second fixed rod are both connected to the first fixed end with bolts for fixing.

[0013] In some embodiments, the fixing assembly further includes a positioning nut, which is disposed at the connection between the first heat insulation board and the first fixing rod and the second fixing rod, and is used to adjust and fix the position of the first heat insulation board on the first fixing rod and the second fixing rod.

[0014] By adopting the above technical solution, the position of the first heat insulation board on the first fixing rod and the second fixing rod is changed by adjusting the tightness of the positioning nut to adapt to batteries of different sizes.

[0015] In some embodiments, the elastic abutment assembly further includes a third fixing rod and a fourth fixing rod. The third fixing rod and the fourth fixing rod both extend along the first direction and are spaced apart along the third direction. One end of the third fixing rod and the fourth fixing rod is fixed to the second fixing end, and the other end is passed through the second heat insulation board. The first pressure spring is sleeved on the first fixing rod, and the second pressure spring is sleeved on the second fixing rod, so as to enable the second heat insulation board to slide elastically along the third fixing rod and the fourth fixing rod.

[0016] In some embodiments, along the first direction, the first fixing rod and the third fixing rod correspond to each other and are integrally arranged, and the second fixing rod and the fourth fixing rod correspond to each other and are integrally arranged.

[0017] By adopting the above technical solution, the second heat insulation board is fixed to the second fixed end by the third fixing rod and the fourth fixing rod. The third fixing rod and the fourth fixing rod are both connected to the second fixed end by bolts for fixing. Since the first fixing rod and the third fixing rod are a continuous whole, and the second fixing rod and the fourth fixing rod are a continuous whole, the second heat insulation board can slide along the first direction, and after the battery is placed in the fixed space, and when testing, the elastic potential energy of the first pressure spring and the second pressure spring is used to continuously apply pressure to the second heat insulation board in the direction of the battery, thereby clamping the battery in cooperation with the first heat insulation board.

[0018] In some embodiments, the battery thermal runaway test fixture further includes a deformation amount detection device. The deformation amount detection device includes a distance sensor and a protective cover. The distance sensor is disposed at the second fixed end, and the protective cover is disposed on the distance sensor. The detection end of the distance sensor is disposed facing the second heat insulation board.

[0019] By adopting the above technical solution, the distance sensor can calculate the deformation and expansion force of the battery during thermal runaway in combination with the elastic contraction of the pressure spring, and a protective cover is provided to protect the distance sensor. The protective cover is connected and fixed with the second fixed end bolt.

[0020] In some embodiments, the battery thermal runaway test fixture further comprises an external data acquisition terminal. The external data acquisition terminal comprises a voltage test line and a temperature acquisition line. The voltage test line is used to connect to the top of the battery, and the temperature acquisition line is used to connect to the outer shell of the battery.

[0021] By adopting the above technical solution, the top cover (ear end) of the battery to be tested is conductive, while the side wall is not conductive. According to this characteristic, a voltage test line and a temperature collection line are set to collect the corresponding battery voltage and temperature.

[0022] In some embodiments, the battery thermal runaway test fixture further includes a protection tube, wherein the protection tube is respectively sleeved on the voltage test line and the temperature collection line.

[0023] By adopting the above technical solution, the temperature collection line and voltage test line connected to the battery are connected to the external data collection terminal through the protection tube, and the voltage and temperature are collected during the thermal runaway process of the battery.

[0024] In some embodiments, the interior of the protection tube is made of quartz material, and the exterior is made of stainless steel material.

[0025] By adopting the above technical solution, the interior of the protection tube is made of high-temperature and corrosion-resistant quartz tube and the outer layer is stainless steel, so that the protection tube has the characteristics of high temperature resistance, corrosion resistance and low strength, and protects the voltage test line and the temperature acquisition line. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a top view of an embodiment of a battery thermal runaway test fixture of the utility model;

[0027] Figure 2 It is a three-dimensional diagram of an embodiment of a battery thermal runaway test fixture of the utility model;

[0028] In the figure:

[0029] 1-battery thermal runaway test fixture; 2-support frame; 20-first fixed end; 21-second fixed end; 30-first heat insulation board; 31-second heat insulation board; 32-fixed space; 4-fixed assembly; 40-first fixed rod; 41-second fixed rod; 42-positioning nut; 5-elastic abutment assembly; 50-first pressure spring; 51-second pressure spring; 52-third fixed rod; 53-fourth fixed rod; 6-deformation variable detection device; 60-distance sensor; 61-protective cover; 70-voltage test line; 71-temperature acquisition line; 72-protective tube. DETAILED DESCRIPTION

[0030] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0031] refer to Figure 1 and Figure 2 , Figure 1 A top view of a battery thermal runaway test fixture provided by an embodiment of the utility model is shown; Figure 2 A stereoscopic diagram of a battery thermal runaway test fixture provided by an embodiment of the utility model is shown.

[0032] like Figure 1 and Figure 2 As shown, the figure shows the technical solution provided by the present application, a battery thermal runaway test fixture, including: a support frame, a first heat insulation board, a second heat insulation board, a fixing assembly and an elastic abutment assembly, wherein:

[0033] The support frame is along the first direction ( Figure 1 The first and second heat insulation boards are arranged along the second direction ( Figure 1 The first fixing end and the second fixing end are arranged between the first fixing end and the second fixing end along the first direction, so as to enclose a fixed space for clamping the battery.

[0034] The fixing assembly is respectively connected to the first insulation board and the first fixed end, and is used to fix and support the first insulation board. The elastic abutment assembly is respectively connected to the second insulation board and the second fixed end. The elastic abutment assembly includes a first pressure spring and a second pressure spring. The first pressure spring and the second pressure spring both extend along the first direction and extend along the third direction ( Figure 1 The second insulation board is spaced between the second fixed end and the second insulation board (as shown in the Y direction) and is used to elastically press the second insulation board to the battery along the first direction through the elastic force of the first pressure spring and the second pressure spring. The first direction, the second direction and the third direction are perpendicular to each other.

[0035] The battery thermal runaway test fixture provided by the utility model uses a support frame as a fixing base, assembles various components of the tool, and uses a pressure spring and a first insulation board and a second insulation board to clamp and fix the battery. The insulation board is made of insulation material, such as polyethylene, polypropylene, natural rubber, etc., and can make it easier for the test instrument to track the heat generation of the battery in the test experiment of reducing battery heat exchange or making the battery in adiabatic temperature rise, while taking into account the role of fixing the battery. The thermal runaway of the battery usually includes electrical abuse and thermal abuse, and the setting of the first pressure spring and the second pressure spring can allow the battery to have enough space to expand when it is thermally runaway. At the same time, due to the elastic effect of the pressure spring, the second insulation board can rebound when the battery is out of control, without damage, and can be reused.

[0036] In some embodiments, reference Figure 1 and Figure 2 The fixing assembly includes a first fixing rod and a second fixing rod. The first fixing rod and the second fixing rod both extend along a first direction and are spaced apart along a third direction, and the first direction, the second direction and the third direction are perpendicular to each other. One end of the first fixing rod and the second fixing rod is fixed to the first fixing end, and the other end is passed through the first heat insulation board.

[0037] Exemplarily, the first heat insulation board is fixed to the first fixed end by a first fixing rod and a second fixing rod. The first fixing rod and the second fixing rod are both connected to the first fixing end by bolts for fixing.

[0038] In some embodiments, reference Figure 1 and Figure 2 The fixing assembly further includes a positioning nut. The positioning nut is arranged at the connection between the first heat insulation board and the first fixing rod and the second fixing rod, and is used to adjust and fix the position of the first heat insulation board on the first fixing rod and the second fixing rod.

[0039] Exemplarily, by adjusting the tightness of the positioning nut, the position of the first heat insulation plate on the first fixing rod and the second fixing rod is changed to adapt to batteries of different sizes.

[0040] In some embodiments, reference Figure 1 and Figure 2 The elastic abutment assembly further includes a third fixing rod and a fourth fixing rod. The third fixing rod and the fourth fixing rod both extend along the first direction and are spaced apart along the third direction. One end of the third fixing rod and the fourth fixing rod is fixed to the second fixing end, and the other end is passed through the second heat insulation board. The first pressure spring is sleeved on the first fixing rod, and the second pressure spring is sleeved on the second fixing rod, so as to enable the second heat insulation board to slide elastically along the third fixing rod and the fourth fixing rod.

[0041] Along the first direction, the first fixing rod and the third fixing rod correspond to each other and are integrally arranged, and the second fixing rod and the fourth fixing rod correspond to each other and are integrally arranged.

[0042] Exemplarily, the second heat shield is fixed to the second fixed end by a third fixing rod and a fourth fixing rod. The third fixing rod and the fourth fixing rod are both connected to the second fixed end with bolts for fixing. Since the first fixing rod and the third fixing rod are a continuous whole, and the second fixing rod and the fourth fixing rod are a continuous whole, the second heat shield can slide along the first direction, and after the battery is placed in the fixed space, and when testing, the elastic potential energy of the first pressure spring and the second pressure spring continuously applies pressure to the second heat shield in the direction of the battery, thereby clamping the battery in cooperation with the first heat shield.

[0043] In some embodiments, reference Figure 1 and Figure 2 The battery thermal runaway test fixture also includes a deformation detection device. The deformation detection device includes a distance sensor and a protective cover. The distance sensor is arranged at the second fixed end, and the protective cover is arranged on the distance sensor. The detection end of the distance sensor is arranged facing the second heat insulation board.

[0044] For example, the distance sensor can calculate the deformation and expansion force of the battery during thermal runaway in combination with the elastic contraction of the pressure spring, and a protective cover is provided to protect the distance sensor. The protective cover is bolted and fixed to the second fixed end.

[0045] In some embodiments, reference Figure 1 and Figure 2 The battery thermal runaway test fixture also includes an external data acquisition terminal. The external data acquisition terminal includes a voltage test line and a temperature acquisition line. The voltage test line is used to connect to the top of the battery, and the temperature acquisition line is used to connect to the outer shell of the battery.

[0046] Exemplarily, the top cover (ear end) of the battery to be tested is conductive, while the side enclosure is not conductive. Based on this characteristic, a voltage test line and a temperature collection line are set to collect the corresponding battery voltage and temperature.

[0047] In some embodiments, reference Figure 1 and Figure 2 The battery thermal runaway test fixture also includes a protection tube. The protection tube is respectively sleeved on the voltage test line and the temperature collection line.

[0048] Exemplarily, the temperature collection line and the voltage test line connected to the battery are connected to the external data collection terminal through a protection tube, and act on the battery thermal runaway process to collect voltage and temperature.

[0049] In some embodiments, the interior of the protection tube is made of quartz and the exterior is made of stainless steel.

[0050] Exemplarily, the inside of the protection tube is made of a high-temperature and corrosion-resistant quartz tube and the outer layer is stainless steel, so that the protection tube has the characteristics of high-temperature resistance, corrosion resistance and low strength, and protects the voltage test line and the temperature acquisition line.

[0051] The above implementation modes are only for illustrating the technical concept and features of the utility model, and their purpose is to allow people familiar with this technology to understand the content of the utility model and implement it. It cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A battery thermal runaway test fixture, characterized in that: include: A supporting frame, with a first fixed end and a second fixed end respectively provided at two ends along a first direction; The first heat insulation board and the second heat insulation board are both extended along the second direction and are spaced apart between the first fixed end and the second fixed end along the first direction, so as to enclose a fixed space for clamping the battery; A fixing assembly, connected to the first heat insulation board and the first fixing end, respectively, and used for fixing and supporting the first heat insulation board; An elastic abutment component is respectively connected to the second heat insulation plate and the second fixed end; the elastic abutment component includes a first pressure spring and a second pressure spring; the first pressure spring and the second pressure spring both extend along the first direction and are arranged between the second heat insulation plate and the second fixed end along a third direction, and are used to enable the second heat insulation plate to be elastically pressed against the battery along the first direction through the elastic force of the first pressure spring and the second pressure spring, and the first direction, the second direction and the third direction are perpendicular to each other.

2. The battery thermal runaway test fixture according to claim 1, characterized in that: The fixing assembly includes a first fixing rod and a second fixing rod; the first fixing rod and the second fixing rod both extend along the first direction and are arranged at intervals along the third direction; one end of the first fixing rod and the second fixing rod is fixed to the first fixing end, and the other end is passed through the first insulation board.

3. The battery thermal runaway test fixture according to claim 2, characterized in that: The fixing assembly also includes a positioning nut; the positioning nut is arranged at the connection between the first insulation board and the first fixing rod and the second fixing rod, and is used to adjust and fix the position of the first insulation board on the first fixing rod and the second fixing rod.

4. The battery thermal runaway test fixture according to claim 2, characterized in that: The elastic abutment assembly also includes a third fixing rod and a fourth fixing rod; the third fixing rod and the fourth fixing rod both extend along the first direction and are spaced apart along the third direction; one end of the third fixing rod and the fourth fixing rod are fixed to the second fixing end, and the other end is passed through the second heat insulation board; the first pressure spring is sleeved on the first fixing rod, and the second pressure spring is sleeved on the second fixing rod, so as to enable the second heat insulation board to slide elastically along the third fixing rod and the fourth fixing rod.

5. The battery thermal runaway test fixture according to claim 4, characterized in that: Along the first direction, the first fixing rod and the third fixing rod correspond to each other and are integrally arranged, and the second fixing rod and the fourth fixing rod correspond to each other and are integrally arranged.

6. The battery thermal runaway test fixture according to claim 1, characterized in that: It also includes a deformation amount detection device; the deformation amount detection device includes a distance sensor and a protective cover; the distance sensor is arranged at the second fixed end, and the protective cover is arranged on the distance sensor; the detection end of the distance sensor is arranged facing the second heat insulation board.

7. The battery thermal runaway test fixture according to claim 1, characterized in that: It also includes an external data acquisition terminal; the external data acquisition terminal includes a voltage test line and a temperature acquisition line; the voltage test line is used to connect to the top of the battery, and the temperature acquisition line is used to connect to the outer shell of the battery.

8. The battery thermal runaway test fixture according to claim 7, characterized in that: It also includes a protection tube; the protection tube is respectively sleeved on the voltage test line and the temperature collection line.

9. The battery thermal runaway test fixture according to claim 8, characterized in that: The interior of the protection tube is made of quartz material, and the exterior is made of stainless steel material.

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