New energy automobile battery aging test cabinet

Abstract

The invention relates to the technical field of battery testing, and discloses a new energy automobile battery aging test cabinet which is characterized in that first transverse partition plates and second transverse partition plates with the same number are arranged in a cabinet body, and an inner cavity of the cabinet body is divided into a plurality of independent buffer cavities and test cavities; a plurality of vertical partition plates are arranged in the test cavity to divide the test cavity into a plurality of independent test bins; at least one communicating hole is formed in the top of each testing bin, and each communicating hole is provided with a hot melting diaphragm for blocking an inner cavity of the communicating hole; the first transverse partition plate and the second transverse partition plate are both made of heat insulation materials. When the new energy automobile battery aging test cabinet is used for carrying out aging test on new energy batteries in batches, if part of the batteries have abnormal temperature rise, spontaneous combustion and even explosion, the negative influence of the batteries on the normally tested batteries in the surrounding test bins can be weakened to the maximum extent.

Description

Technical Field

[0001] This invention belongs to the field of battery testing technology, specifically relating to a battery aging test cabinet for new energy vehicles. Background Technology

[0002] Batteries are a key component of new energy vehicles, serving as both the primary and auxiliary power source for the vehicle's drive system. Battery technology is central to the development of new energy vehicles. To identify potential hazards, batteries need to be tested to improve their quality. Current technology indicates that batteries often release heat during aging tests due to inherent problems, leading to abnormal temperature increases, spontaneous combustion, and even explosions. To prevent explosions of faulty batteries from harming workers and the environment, performance testing is typically conducted in a testing cabinet. Furthermore, to improve testing efficiency, multiple batteries are often placed in the testing cabinet for batch testing.

[0003] In related technologies, test cabinets often have multiple shelves, on which multiple batteries may be placed for testing simultaneously. When some batteries malfunction, causing abnormal temperature rises, spontaneous combustion, or even explosion, it may affect other batteries being tested, not only impacting the accuracy of test results but also posing certain safety hazards.

[0004] To address the aforementioned problems, the relevant technologies have attempted to solve them using the following methods:

[0005] Two guide plates are fixedly installed on the rack, and an explosion-proof box can be placed between the two guide plates. When an abnormality occurs in the battery inside the explosion-proof box, the staff can quickly pull the explosion-proof box out of the rack, disconnecting the battery from the external wiring. This allows the battery test to be paused without opening the explosion-proof box, preventing the spillage of materials when the box is opened. This method requires the testing personnel to monitor the status of each battery during testing, and the personnel must be able to handle problems quickly and accurately, which is relatively inconvenient. CN215728697U provides a battery aging test cabinet, which is equipped with a swingable dry powder spraying device, which can effectively suppress the growth of fire by spraying dry powder over a large area. Although this method can suppress the spread of fire, it cannot eliminate the negative impact of battery explosion / combustion on other batteries tested in the same batch, causing other batteries to be scrapped or the test results to be deviated. In addition, the test cabinet is difficult to clean after spraying dry powder.

[0006] Therefore, there are other ways to minimize the negative impacts of abnormal battery heating, combustion, or even explosion during testing. Summary of the Invention

[0007] The purpose of this invention is to provide a new energy vehicle battery aging test cabinet that can minimize the negative impacts caused by abnormal battery temperature rise, spontaneous combustion, or even explosion during testing.

[0008] To achieve the above objectives, the present invention provides the following specific technical solution:

[0009] A battery aging test cabinet for new energy vehicles includes a cabinet body. Between the top and bottom plates of the cabinet body, several parallel first and second horizontal partitions are alternately arranged from top to bottom. The number of first and second horizontal partitions is equal, dividing the cabinet's internal cavity into several independent buffer chambers and test chambers alternately distributed from top to bottom. Several vertical partitions, with their top ends fixed to the first horizontal partitions, are arranged on the top surface of the second horizontal partitions, dividing the test chambers into several independent test compartments. Each test compartment has at least one connecting hole at its top, and test compartments on the same layer are connected to the adjacent buffer chamber above through these connecting holes. Each connecting hole is equipped with a heat-melting membrane to seal the inner cavity of the connecting hole. Both the first and second horizontal partitions are made of heat-insulating material.

[0010] By adopting the above technical solution, when conducting batch testing of batteries, one battery is placed in each test chamber. When some batteries abnormally heat up or spontaneously combust, the pressure and temperature of the corresponding test chamber will increase. Once the threshold is reached, the heat-fused diaphragm in the connecting hole will be ruptured by the pressure or melted by the high temperature, thereby connecting the test chamber with the buffer chamber. This releases the pressure accumulated in the test chamber, preventing the test chamber from bursting due to overpressure and affecting the batteries in the surrounding chambers. At the same time, the relatively independent test chamber has a certain degree of temperature insulation, thus minimizing the negative impact caused by problems with some batteries.

[0011] Furthermore, the hot melt separator is selected from any one of PA-type hot melt adhesive film, PES-type hot melt adhesive film, TPU-type hot melt adhesive film, EVA-type hot melt adhesive film, and EAA-type hot melt adhesive film.

[0012] Furthermore, an installation tube is fixedly connected within the communicating hole, and the hot-melt diaphragm covers the end of the installation tube; the length of the installation tube is less than the depth of the communicating hole. This allows for convenient and quick replacement of the installation tube with a damaged hot-melt diaphragm. The hot-melt diaphragm and the installation tube can be directly hot-melted or bonded with adhesive.

[0013] Furthermore, the bottom periphery of the mounting tube is provided with a mounting ring plate, a movable insert rod is inserted into the first transverse partition plate, and a through hole is opened on the mounting ring plate for the movable insert rod to be inserted; the movable insert rod includes a first rod body and a second rod body with a diameter smaller than the first rod body located in the through hole; a fixed convex ring is coaxially fixed at the end of the second rod body away from the first rod body, and a movable convex ring is coaxially sleeved on the second rod body; the outer circumferential surfaces of the fixed convex ring and the movable convex ring are tapered, and their outer radial directions gradually decrease in opposite directions; a spring pin is installed radially on the mounting ring plate, the end of the spring pin is inserted into the through hole and is provided with a guide slope; the movable insert rod includes a spring-force reset mechanism for maintaining a gap between the movable convex ring and the fixed convex ring.

[0014] By adopting the above technical solution, after inserting the installation tube into the connecting hole, a movable insert rod is inserted from top to bottom into the first partition plate. During the insertion of the movable insert rod into the through hole, the spring pin first retracts and then abuts against the second column, at which point the movable insert rod cannot retract. Compared with the threaded connection of the installation tube, this method of installation can achieve more efficient replacement of the hot melt diaphragm. When disassembly is required, continue to insert the movable insert rod downwards until the movable convex ring pushes the spring pin back; the end of the spring pin moves to abut against the conical surface of the movable convex ring, and then the movable insert rod is pulled upwards. At this time, due to the presence of the spring pin, the movable convex ring moves along the second rod body to fit against the fixed convex ring. As the movable insert rod moves upwards, the spring pin moves from the conical surface of the movable convex ring to the conical surface of the fixed convex ring; continue to pull the movable insert rod to remove it, at which point the installation tube can be removed.

[0015] Furthermore, at least three movable inserts are spaced apart around the circumference of the mounting ring plate, which increases the reliability of the mounting tube installation.

[0016] Furthermore, the second rod body has a mounting cavity that extends to the end of the second rod body to form an opening. A pair of symmetrically distributed guide grooves are formed on the circumferential side of the second rod body along its length, on both sides of the rod's axis. A guide crossbar passes through both guide grooves, and both ends of the guide crossbar are fixed to the inner wall of the movable convex ring. The mounting cavity is equipped with a return spring, and a sealing element is provided at the opening of the mounting cavity. The return spring is located between the guide crossbar and the sealing element. The presence of the return spring ensures that, in the initial state, the movable convex ring and the fixed convex ring maintain a certain gap, facilitating the smooth engagement of the spring pin end between them.

[0017] Furthermore, the top surface of the first transverse partition is provided with several receiving slots located within the buffer cavity, and the receiving slots are filled with fire extinguishing agent. When the battery burns, the fire extinguishing agent helps to suppress the spread of the fire.

[0018] Furthermore, the extinguishing agent is sodium bicarbonate powder and / or calcium bicarbonate powder. When heated, sodium bicarbonate powder and calcium bicarbonate powder decompose and release carbon dioxide, which is beneficial for extinguishing fires and inhibiting their spread.

[0019] Furthermore, a hexagonal mesh grid is fixedly installed on the top surface of the first transverse partition, and the holes of the hexagonal mesh grid and the top surface of the first transverse partition form a receiving groove for containing the fire extinguishing agent.

[0020] Furthermore, the vertical partition consists of a first panel layer, a second panel layer, several intermediate panel layers, and several grid layers; the grid layers are disposed between the first and second panel layers, and the mesh of the grid layers is hexagonal; the intermediate panel layers are disposed between adjacent grid layers. This type of vertical partition is lightweight yet possesses sufficient strength, making it less prone to cracking under high temperature and pressure, thus facilitating the suppression of fire spread.

[0021] Furthermore, at least three layers of grating are provided between the first panel layer and the second panel layer, and the holes in adjacent grating layers are staggered. This structure provides better vertical diaphragm strength.

[0022] Furthermore, the cabinet sidewall is equipped with several pressure relief devices communicating with the buffer chambers, with each buffer chamber having at least one pressure relief device. When the pressure inside the buffer chamber is too high, the pressure relief devices can be used to release the pressure and maintain the pressure inside the buffer chamber at a relatively safe level.

[0023] Furthermore, around the vertical point on the top wall of the buffer chamber, the central axis of each connecting hole is surrounded by several protrusions arranged in a logarithmic spiral pattern, which can effectively buffer the impact force of high-temperature and high-pressure gas entering the buffer chamber.

[0024] Furthermore, the protrusions are in the form of dots, arc-shaped segments, or continuous logarithmic spirals.

[0025] Furthermore, the side panel of the cabinet is provided with a gap that communicates with the buffer cavity, which increases the volume of the buffer cavity and better mitigates the negative impact of a single or partial battery failure on the remaining batteries in the test.

[0026] The present invention has the following beneficial effects:

[0027] This invention features a buffer chamber located above the test chamber, connected by a connecting hole containing a heat-fused separator. When a battery in an independent test chamber malfunctions, abnormal temperature rise or spontaneous combustion causes an increase in temperature and pressure within the test chamber. When the heat-fused separator reaches its threshold, it ruptures, connecting the test chamber and the buffer chamber. This process mitigates the temperature and pressure within the test chamber, suppressing negative impacts. Because each test chamber is relatively independent, the impact of a problem with a single or partial battery on the remaining batteries in the test can be reduced. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the new energy vehicle battery aging test cabinet in an embodiment of the present invention;

[0029] Figure 2 This is a (partial) cross-sectional view of the new energy vehicle battery aging test cabinet in Embodiment 1 of the present invention;

[0030] Figure 3 for Figure 2 Enlarged view of section A;

[0031] Figure 4 This is a schematic diagram of the protrusion on the top wall of the buffer cavity in Embodiment 1 of the present invention;

[0032] Figure 5 This is a schematic diagram of the structure of the receiving groove on the top surface of the first transverse partition in Embodiment 1 of the present invention;

[0033] Figure 6 This is a schematic diagram of the vertical partition in Embodiment 1 of the present invention;

[0034] Figure 7 This is a schematic diagram of the structure of the mounting tube, mounting ring plate, and movable insertion rod in Embodiment 2 of the present invention;

[0035] Figure 8 for Figure 7 An enlarged schematic diagram of part B;

[0036] Figure 9 This is a schematic diagram of the movable insert rod in Embodiment 2 of the present invention;

[0037] Figure 10a / Figure 10b / Figure 10c / Figure 10d / Figure 10e / Figure 10f All of these are schematic diagrams illustrating the installation and disassembly process of the movable insert rod in Embodiment 2 of the present invention.

[0038] Explanation of reference numerals in the attached figures:

[0039] 1. Cabinet body; 11. Top plate; 12. Bottom plate; 13. Side plate; 2. First transverse partition; 21. Movable insert rod; 211. First rod body; 212. Second rod body; 2121. Mounting cavity; 2122. Guide groove; 213. Fixed protruding ring; 214. Movable protruding ring; 2141. Return spring; 2142. Guide crossbar; 215. Sealing component; 216. Auxiliary spring; 22. Hexagonal mesh grille; 221. Receiving groove; 23. Protrusion; 3. Second horizontal partition; 4. Vertical partition; 41. First panel layer; 42. Second panel layer; 43. Intermediate panel layer; 44. Grating panel layer; 5. Buffer chamber; 6. Test chamber; 61. Connecting hole; 7. Hot melt diaphragm; 8. Mounting pipe; 81. Mounting ring plate; 811. Through hole; 812. Spring pin; 8121. Guide slope; 9. Pressure relief device; 91. Pressure relief pipe; 92. Plunger; 93. End cap; 94. Buffer spring; 95. Support component. Detailed Implementation

[0040] To enable those skilled in the art to better understand the technical solutions of this invention, the present application will be further described in detail below with reference to the accompanying drawings.

[0041] [Example 1]

[0042] A battery aging test cabinet for new energy vehicles is used for batch aging tests on new energy vehicle batteries. (Refer to...) Figure 1 and Figure 2 The system includes a rectangular box-shaped cabinet 1, which consists of a top plate 11, a bottom plate 12, side plates 13, and several partitions. The partitions include several first horizontal partitions 2 and second horizontal partitions 3 arranged parallel to the top plate 11, alternating from top to bottom in equal numbers, dividing the internal space of the cabinet 1 into several independent buffer chambers 5 and test chambers. In this embodiment, two first horizontal partitions 2 and two second horizontal partitions 3 are provided, dividing the internal space of the cabinet 1 into buffer chambers 5, test chambers, and buffer chambers 5 and test chambers arranged from top to bottom.

[0043] Reference Figure 2 Each test chamber is fixedly equipped with a vertical partition 4, dividing the test chamber into two relatively independent test compartments 6. Each test compartment 6 is equipped with an independent heating device and temperature control system. The heating and temperature control of the aging test cabinet is existing technology and will not be described in detail here. When implementing the present invention, existing methods can be directly adopted or simply modified based on existing methods, as long as they can heat up and control the temperature of each test. During testing, each test compartment 6 can hold one new energy vehicle battery, enabling batch aging tests on multiple new energy vehicle batteries.

[0044] Reference Figure 2 and Figure 3During the test, in order to minimize the negative impact on the batteries undergoing normal testing in the surrounding test chamber 6 when a single or partial battery experiences abnormal heating, spontaneous combustion, or even explosion, this embodiment has a connecting hole 61 on the first horizontal partition 2 and a pressure relief device 9 connected to the buffer chamber 5 on the side wall of the cabinet 1.

[0045] Reference Figure 2 and Figure 3 Each test chamber 6 on the same layer is connected to the buffer chamber 5 above it through a connecting hole 61. Each connecting hole 61 has a mounting tube 8 threaded from bottom to top. The length of the mounting tube 8 is less than the depth of the connecting hole 61. A hot-melt diaphragm 7 is provided at the top opening of the mounting tube 8, and a mounting ring plate 81 is provided around the bottom periphery. In this embodiment, an EVA-type hot-melt adhesive film with a melting point of approximately 90°C is used, which is adhered and fixed to the end of the mounting tube 8 by hot pressing. When the temperature and / or pressure inside the test chamber 6 rises to the melting / rupture threshold of the hot-melt diaphragm 7, the hot-melt diaphragm 7 breaks, and the test chamber 6 connects to the buffer chamber 5. This allows the high-temperature, high-pressure gas inside the test chamber 6 to be poured into the buffer chamber 5 for slow release, preventing the test chamber 6 from cracking due to excessive pressure and facilitating cooling by releasing the pressure in the test chamber 6.

[0046] Reference Figure 2 and Figure 3 The pressure relief device 9 is used to release pressure to the outside after the pressure in the buffer chamber 5 has accumulated to a certain level, thus ensuring safety. The pressure relief device 9 includes a pressure relief pipe 91, a plunger 92 coaxially disposed in the pressure relief pipe 91, an end cap 93 fixed to the end of the plunger 92 for sealing the opening of the pressure relief pipe 91, a buffer spring 94 sleeved on the plunger 92, and a support member 95 for supporting the plunger 92. The support member 95 is fixed to the inner wall of the pressure relief pipe 91 and is located on the side close to the buffer chamber 5; the support member 95 has a flow channel for airflow; the plunger 92 passes through the support member 95, can move along its own axial direction, and has a limiting protrusion at its end to prevent it from detaching from the support member 95; one end of the buffer spring 94 is fixedly connected to the support member 95, and the other end is fixedly connected to the end cap 93. Under normal conditions, the presence of the buffer spring 94 ensures that the end cap 93 seals the opening of the pressure relief pipe 91, isolating the buffer chamber 5 from the outside. When the pressure inside the buffer chamber 5 is too high, the plunger 92 and the end cap 93 retract under the action of air pressure, and the buffer spring 94 is stretched until a gap appears between the end cap 93 and the opening of the pressure relief pipe 91, thus releasing pressure. After the pressure inside the buffer chamber 5 decreases, the end cap 93 returns to its state of sealing the opening of the pressure relief pipe 91 under the action of the buffer spring 94. Depending on actual needs, multiple sets of pressure relief devices 9 can be provided in other embodiments.

[0047] Reference Figure 2 , Figure 4 and Figure 5To further mitigate the negative impact of abnormal heating, spontaneous combustion, or even explosion of some batteries on the batteries undergoing normal testing in the surrounding test chamber 6, a hexagonal mesh grid 22 is fixedly installed on the bottom wall of the buffer chamber 5 (the top surface of the first transverse partition 2) in this embodiment. The holes of the hexagonal mesh grid 22 and the bottom wall of the buffer chamber 5 together form several hexagonal receiving grooves 221. Fire extinguishing agents such as sodium bicarbonate powder and / or calcium bicarbonate powder are placed in the receiving grooves 221. When the temperature inside the buffer chamber 5 is too high, the fire extinguishing agent decomposes upon heating to produce carbon dioxide, which helps to suppress the spread of fire. Sodium bicarbonate powder is selected as the fire extinguishing agent in this embodiment. At the same time, several protrusions 23 distributed in a logarithmic spiral pattern are distributed around the perpendicular point of the axis of each connecting hole 61 on the top wall of the buffer chamber 5 (the bottom surface of the top plate 11 or the bottom surface of the second transverse partition 3). The protrusions 23 can be in the form of dots or arc-shaped strips. The protrusion 23 is designed so that when high-temperature and high-pressure gas rushes into the buffer chamber 5 through the connecting hole 61, the presence of the protrusion 23 can weaken the impact force and reduce damage to the test cabinet.

[0048] Reference Figure 2 and Figure 6 The vertical partition 4 is made of heat-insulating material and includes a first panel layer 41, a second panel layer 42, an intermediate panel layer 43, and a grid layer 44. The intermediate panel layer 43 and the grid layer 44 are alternately arranged between the first panel layer 41 and the second panel layer 42. In this embodiment, the vertical partition 4 includes two grid layers 44 and an intermediate panel layer 43 sandwiched between the grid layers 44. The holes of adjacent grid layers 44 are staggered. In this embodiment, the holes of the grid layers 44 are hexagonal. The vertical partition 4 with this structure is lightweight and high-strength. The several independent cavities inside are beneficial for heat insulation and reducing the negative impact of the battery explosion shock wave on the battery in the surrounding test chamber 6. In other embodiments, three or more grid layers 44 can be provided, with intermediate panels 43 sandwiched between adjacent grid layers 44 and the holes staggered.

[0049] [Example 2]

[0050] The only difference between Example 2 and Example 1 is that the installation method of the installation tube 8 is different.

[0051] Reference Figure 7 , Figure 8 and Figure 9 The mounting tube 8 is a smooth tube, which is directly inserted into the connecting hole 61. Several through holes 811 are circumferentially formed on the mounting ring plate 81, with the axial direction of the through holes 811 parallel to the axis of the mounting tube 8. Several circumferentially spaced spring pins 812 are inserted around the periphery of the mounting ring plate 81, with the ends of the spring pins 812 inserted into the through holes 811 and having a guide bevel 8121. In this embodiment, three spring pins are inserted into each mounting ring plate 81.

[0052] Reference Figure 7 , Figure 8 and Figure 9 A movable insert rod 21 is provided from top to bottom on the first transverse partition 2 and inserted into the mounting ring plate 81. This rod engages with the spring pin 812 to lock the mounting tube 8 and the mounting ring plate 81. The movable insert rod 21 includes a first rod body 211, a second rod body 212, and an auxiliary spring 216 arranged coaxially. The diameter of the first rod body 211 is equal to the diameter of the through hole 811. It is inserted into the first transverse partition 2, and its top end has an anti-detachment protrusion to facilitate installation. The auxiliary spring 216 is sleeved on the first rod body 211 and located between the anti-detachment protrusion and the top surface of the first transverse partition 2. The diameter of the second rod body 212 is smaller than that of the first rod body 211, and its length is equal to the thickness of the mounting ring plate 81 (the depth of the through hole 811). It is inserted into the through hole 811. A fixed protruding ring 213 and a movable protruding ring 214 are coaxially arranged on the second rod body 212. Both are frustum-shaped, and their outer radial directions gradually decrease in opposite directions. A fixed convex ring 213 is located at the bottom end of the second rod 212, and its outer diameter gradually increases towards the first rod 211. The inclined direction of the spring pin 812 is consistent with the inclined direction of the conical side of the fixed convex ring 213. A movable convex ring 214 is coaxially sleeved on the first rod 211 and can slide along the length of the second rod 212. An installation cavity 2121 is opened inside the second rod 212, and the installation cavity 2121 extends to the bottom end of the second rod 212 (end face of the fixed convex ring 213) to form an opening. A sealing block is threaded to the opening of the installation cavity 2121. A pair of strip-shaped guide grooves 2122 are symmetrically distributed on both sides of the central axis of the second rod 212 on the circumferential side wall of the second rod 212. A guide crossbar 2142 is inserted through the two guide grooves 2122 along a direction perpendicular to the axis of the second rod 212, and both ends of the guide crossbar 2142 are fixed to the inner wall of the movable convex ring 214. A return spring 2141 is provided within the mounting cavity 2121, located between the sealing member 215 and the guide crossbar 2142. The presence of the return spring 2141 ensures that a certain gap remains between the movable convex ring 214 and the fixed convex ring 213 when no external force is applied, facilitating the insertion of the end of the spring pin 812 with the guide bevel 8121. Through the mutual cooperation of the spring pin 812, the movable convex ring 214, and the fixed convex ring 213, the installation, fixing, and disassembly of the mounting ring plate 81 can be completed by pulling the movable insertion rod 21. Specifically:

[0053] Reference Figure 10a When the first rod 211 is inserted, the second rod 212, the fixed protrusion ring 213 and the movable protrusion ring 214 move down simultaneously until the conical surface of the fixed protrusion ring 213 abuts against the guide slope 8121 of the spring pin 812. As the first rod 211 is inserted, the spring pin 812 is squeezed back.

[0054] Reference Figure 10bThe first rod 211 continues to be inserted until the end of the spring pin 812 is inserted between the movable protruding ring 214 and the fixed protruding ring 213, completing the installation. At this time, the mounting ring plate 81 is fixed.

[0055] Reference Figure 10c When it is necessary to disassemble and install the ring plate 81, first insert the first rod body 211 until the spring pin 812 moves to abut against the conical surface of the movable convex ring 214;

[0056] Reference Figure 10d Pull the first rod 211 upward. Due to the abutment of the spring pin 812, the movable protrusion 214 slides downward along the second rod 212 during the upward movement of the first rod 211 until it comes into contact with the fixed protrusion 213.

[0057] Reference Figure 10e and Figure 10f If the first rod 211 is pulled further, the spring pin 812 will move until it abuts against the conical surface of the fixed protrusion ring 213, at which point its locking effect on the fixed protrusion ring 213 will be released.

[0058] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A new energy vehicle battery aging test cabinet, comprising a cabinet body (1), characterized in that: A plurality of mutually parallel first transverse partitions (2) and second transverse partitions (3) are alternately arranged from top to bottom between a top plate (11) and a bottom plate (12) of the cabinet body (1); the first transverse partitions (2) and the second transverse partitions (3) are equal in number, and the inner cavity of the cabinet body (1) is divided into a plurality of independent buffer cavities (5) and test cavities alternately arranged from top to bottom; a plurality of vertical partitions (4) whose top ends are fixed to the first transverse partitions (2) are arranged on the top surface of the second transverse partition (3); the plurality of vertical partitions (4) divide the test cavity into a plurality of independent test chambers (6); at least one connecting hole (61) is opened on the top of each test chamber (6); the test chambers (6) on the same layer are all connected to the buffer chamber (5) above through the connecting hole (61); each connecting hole (61) is provided with a hot-melt diaphragm (7) for blocking the inner cavity of the connecting hole (61); the first transverse partition (2) and the second transverse partition (3) are both made of heat-insulating material.

2. A new energy vehicle battery aging test cabinet according to claim 1, characterized in that: A mounting tube (8) is fixedly connected inside the communicating hole (61), and the hot-melt diaphragm (7) covers the end of the mounting tube (8); the length of the mounting tube (8) is smaller than the depth of the communicating hole (61).

3. A new energy vehicle battery aging test cabinet according to claim 1, characterized in that: The top surface of the first transverse partition (2) is provided with a plurality of receiving grooves (221) located in the buffer cavity (5), and the receiving grooves (221) are filled with fire extinguishing agent.

4. A new energy vehicle battery aging test cabinet according to claim 3, characterized in that: The fire extinguishing agent is sodium bicarbonate powder and / or calcium bicarbonate powder.

5. A new energy vehicle battery aging test cabinet according to claim 4, characterized in that: A hexagonal mesh grille (22) is fixedly arranged on the top surface of the first transverse partition (2), and the holes of the hexagonal mesh grille (22) and the top surface of the first transverse partition (2) are combined to form a containing groove (221) for containing the fire extinguishing agent.

6. A new energy vehicle battery aging test cabinet according to any one of claims 1 to 5, characterized in that: The vertical partition (4) is composed of a first panel layer (41), a second panel layer (42), a plurality of intermediate panel layers (43) and a plurality of grid panel layers (44); the grid panel layer (44) is arranged between the first panel layer (41) and the second panel layer (42), and the holes of the grid panel layer (44) are hexagonal; the intermediate panel layer (43) is arranged between two adjacent grid panel layers (44).

7. A new energy vehicle battery aging test cabinet according to claim 6, characterized in that: At least three layers of grid plate layers (44) are provided between the first panel layer (41) and the second panel layer (42), and holes are staggered between two adjacent layers of grid plate layers (44).

8. A new energy vehicle battery aging test cabinet according to any one of claims 1 to 5, characterized in that: A plurality of pressure relief devices (9) connected to the buffer chambers (5) are provided on the side wall of the cabinet (1), and each buffer chamber (5) is connected to at least one pressure relief device (9).

9. A new energy vehicle battery aging test cabinet according to any one of claims 1 to 5, characterized in that: A plurality of protrusions (23) distributed in a logarithmic spiral shape are distributed around the vertical point of the central axis of each communicating hole (61) on the top wall of the buffer cavity (5).

10. A new energy vehicle battery aging test cabinet according to claim 9, characterized in that: The protrusion (23) is in the shape of a point, an arc segment or a continuous logarithmic spiral.

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