Battery testing device

Abstract

The utility model discloses a battery testing device. A bearing table is used for placing a battery to be tested; the pressing assembly comprises a pressing plate and a displacement sensor, the displacement sensor is at least arranged on the pressing plate, and a sensing part of the displacement sensor can detect the expansion displacement of the battery to be detected; the movable end of the pressure applying piece is connected with the abutting assembly, the movable end can reciprocate to drive the abutting plate to be close to or away from the bearing table, and the sensing part of the displacement sensor can detect expansion displacement of the to-be-detected battery; the gas detection assembly is communicated with a pressure release valve of the to-be-detected battery, so that the gas detection assembly can detect the amount of gas discharged by the to-be-detected battery. The size and change of the expansion displacement of the to-be-tested battery in the process that the normal temperature rises to the target temperature can be obtained through the displacement sensor, the gas discharged by the to-be-tested battery is collected through the gas detection assembly, the gas discharge amount is obtained, and the expansion displacement and gas production parameters in the test process of the to-be-tested battery are obtained, so that parameter support is provided for a research and development person; the battery safety performance is improved.

Description

Technical Field

[0001] This utility model generally relates to the field of lithium battery technology, and in particular to a battery testing device. Background Technology

[0002] Lithium batteries are increasingly widely used in consumer electronics, aerospace, energy storage and new energy vehicles due to their advantages such as high energy density, high operating voltage, low self-discharge, high charging efficiency, long cycle life and no memory effect.

[0003] During use, lithium batteries undergo various chemical reactions that produce gas, increasing internal pressure and causing the battery casing to expand. When a significant amount of gas is produced inside the lithium battery, an explosion hazard can occur.

[0004] In related technologies, battery testing devices cannot determine the amount of gas produced inside lithium batteries during the expansion process. Therefore, there is an urgent need to develop a device that can quickly measure the amount of gas produced by lithium batteries. Utility Model Content

[0005] This application aims to provide a battery testing device, which is at least used to collect the gas emitted by the battery under test and obtain the gas emission amount, thereby obtaining the gas production parameters during the testing of the battery under test.

[0006] This utility model provides a battery testing device, including a support platform, a pressure-reducing component, and a pressure-applying component.

[0007] The support platform is used to place the battery under test; the pressure assembly includes a pressure plate and a displacement sensor, the displacement sensor being at least disposed on the pressure plate, and the sensing part of the displacement sensor being able to detect the expansion displacement of the battery under test; the movable end of the pressure applying member is connected to the pressure assembly, and the movable end is able to reciprocate to drive the pressure plate closer to or away from the support platform; the gas detection assembly is connected to the pressure relief valve of the battery under test, so that the gas detection assembly can detect the amount of gas discharged by the battery under test.

[0008] As one possible implementation, the pressure-blocking assembly also includes a connecting plate and a pressure sensor.

[0009] The movable end of the pressure-applying component is connected to the connecting plate, and the pressure sensor is sandwiched between the pressure plate and the connecting plate. The pressure sensor is used to obtain the start time and end time of the venting of the battery under test.

[0010] As one possible implementation, the pressure assembly is provided with a plurality of displacement sensors arranged around the pressure sensor.

[0011] In one possible implementation, the displacement sensor is movably connected to the pressure plate and the connecting plate, and the distance between the displacement sensor and the pressure sensor is adjustable.

[0012] As an implementation method, the connecting plate is provided with a plurality of second sliding grooves, and the pressing plate is provided with a plurality of first sliding grooves. The first sliding grooves and the second sliding grooves are correspondingly arranged and extend in the same direction. The displacement sensor passes through the first sliding groove and the second sliding groove and slides along the first sliding groove and the second sliding groove.

[0013] As an implementation, the support platform includes at least two support plates, the support plates being movable to have a first position and a second position, the support plates switching between the first position and the second position, and hovering between the first position and the second position;

[0014] The support plate is in the first position, and the support plates are spliced ​​together to form the support platform; the support plate is in the second position, and the support plates form an opening for the battery to be tested to pass through.

[0015] As an implementation, the support platform includes two support plates, which are horizontally arranged in the first position and swing downward from the first position to the second position, or the support plates slide in the horizontal direction to have the first position and the second position.

[0016] As an alternative implementation, a recycling box is also included, which is located below the support plate, with the opening of the recycling box corresponding to the openness, and fire extinguishing sand is provided inside the recycling box.

[0017] As an alternative implementation, a housing is also included, wherein a partition is provided inside the housing to divide the housing's accommodating cavity into a first accommodating cavity and a second accommodating cavity, which are arranged vertically.

[0018] The pressure-reducing component and the pressure-applying element are located in the first accommodating cavity, the recycling box is located in the second accommodating cavity, the partition plate is provided with mounting holes, and the bearing plate is hinged to the mounting holes.

[0019] In one possible implementation, the gas detection component includes a liquid storage container and a liquid measuring container, the liquid measuring container having graduations. The liquid storage container is connected to the pressure relief valve of the battery under test via a connecting pipe, and the liquid storage container is connected to the liquid measuring container via a drain pipe.

[0020] In the above-described scheme, this embodiment can acquire the expansion displacement of the battery under test in real time through a displacement sensor and the temperature sensor can acquire the temperature change of the battery under test in real time. This allows the acquisition of the magnitude and change of the expansion displacement of the battery under test as it rises from the normal temperature to the target temperature. The gas emitted by the battery under test is collected by a gas detection component, and the amount of gas emitted is acquired. Thus, the expansion displacement, gas production, and temperature change parameters of the battery under test during the test can be obtained to provide parameter support for developers and improve battery safety performance. Attached Figure Description

[0021] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0022] Figure 1 A schematic diagram of the battery testing device provided in an embodiment of this utility model;

[0023] Figure 2 This is an internal schematic diagram of the battery testing device provided in an embodiment of the present invention;

[0024] Figure 3 yes Figure 2 A magnified view of a portion of the image;

[0025] Figure 4 An internal front view of the battery testing device provided in an embodiment of this utility model;

[0026] Figure 5 yes Figure 4 A sectional view;

[0027] Figure 6 A schematic diagram of a support plate 11 switching between a first position and a second position provided in an embodiment of this utility model;

[0028] Figure 7 This is a schematic diagram of the structure of the gas detection component provided in an embodiment of the present utility model;

[0029] Support platform 10, support plate 11, telescopic rod 12;

[0030] Compression assembly 20, compression plate 21, connecting plate 22, displacement sensor 23, pressure sensor 24, limit block 25;

[0031] Pressure applying component 30, movable end 31 of pressure applying component, partition plate 40, mounting hole 41

[0032] Gas detection component 50, liquid storage container 51, liquid measuring container 52, connecting pipe 53, drain pipe 54;

[0033] Box 60, first accommodating cavity 601, second accommodating cavity 602, recycling box 70. Detailed Implementation

[0034] The present application 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 relevant utility model and not intended to limit the scope of the utility model. Furthermore, it should be noted that, for ease of description, only the parts relevant to the utility model are shown in the accompanying drawings.

[0035] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0036] At least see Figures 1-7 As shown, this utility model provides a battery testing device, which includes: a support platform 10, a pressure component 20, a pressure application component 30, a gas detection component 50, a recycling box 70, and a housing 60.

[0037] like Figure 5 As shown, the housing 60 has a receiving cavity, and a partition plate 40 is provided inside the receiving cavity, dividing the receiving cavity into a first receiving cavity 601 and a second receiving cavity 602. The first receiving cavity 601 and the second receiving cavity 602 are arranged vertically. A cover plate is hinged to the opening of the first receiving cavity 601, and the cover plate covers the opening of the first receiving cavity 601 to make the first receiving cavity 601 a closed space.

[0038] like Figure 5 As shown, a mounting hole 41 is provided on the partition plate 40, and the support platform 10 is mounted in the mounting hole 41. The battery to be tested is placed on the support platform 10, and the battery to be tested is located in the first accommodating cavity 601.

[0039] The support platform 10 includes at least two support plates 11, each capable of movement and having a first position and a second position. The support plates 11 can switch between the first and second positions and hover between them. In the first position, the support plates 11 are assembled to form the support platform 10; in the second position, each support plate 11 forms an opening 101 through which the battery to be tested passes. Figure 5 As shown by the green dashed line.

[0040] For example, the support platform 10 can be divided into two support plates 11, left and right; or, the support platform 10 can be divided into four support plates 11, front, back, left, and right; or, the support platform 10 can be divided into support plates 11 in three of the four directions, such as front, back, left, and right, etc. This embodiment does not list them all. Figure 6 As shown, the support plate 11 can slide linearly back and forth in the horizontal direction to have a first position and a second position. When the support plate 11 is in the second position, as shown... Figure 6As shown by the green dashed line, slide the plate 40 to the area where the mounting hole 41 is not provided, so that each carrier plate 11 forms an opening 101 for the battery to be tested to pass through, and the opening 101 is correspondingly provided with the mounting hole 41; or, as Figure 5 As shown, the support plate 11 is horizontally positioned in the first position and vertically positioned in the second position. The support plate 11 can swing back and forth between the first and second positions, as shown. Figure 5 As shown by the green dashed line, the support plate 11 swings to the vertical direction, so that each support plate 11 forms an opening 101 for the battery to be tested to pass through, and the opening 101 is set in correspondence with the mounting hole 41.

[0041] like Figure 2 and Figure 4 As shown, the pressure-applying component 30 and the pressure-blocking assembly 20 are located within the first receiving cavity 601. The pressure-applying component 30 is connected to the top of the first receiving cavity 601. The pressure-applying component 30 has a movable end 31, which can reciprocate in the vertical direction. The pressure-applying component 30 can be an electric telescopic mechanism, a hydraulic telescopic mechanism, a pneumatic telescopic mechanism, etc., and this embodiment is not limited to this. The movable end 31 of the pressure-applying component 30 is connected to the pressure-blocking assembly 20, which can approach and move away from the support platform 10, so that the pressure-blocking assembly 20 can press against the battery under test, thereby applying a pre-tightening force to the battery under test.

[0042] Among them, such as Figure 3 As shown, the pressure-applying assembly 20 includes a pressure plate 21, a connecting plate 22, a displacement sensor 23, and a pressure sensor 24. The movable end 31 of the pressure-applying member 30 is connected to the connecting plate 22, and the pressure sensor 24 is sandwiched between the connecting plate 22 and the pressure plate 21. The displacement sensor 23 can be disposed on the pressure plate 21, that is, the sensing part of the displacement sensor 23 can pass through the pressure plate 21, and the sensing part of the displacement sensor 23 protrudes from the lower surface of the pressure plate 21; or, the displacement sensor 23 can be disposed on the pressure plate 21 and the connecting plate 22, that is, the sensing part of the displacement sensor 23 can pass through the connecting plate 22 and the pressure plate 21, and the sensing part of the displacement sensor 23 protrudes from the lower surface of the pressure plate 21. The sensing part of the displacement sensor 23 is elastic and extensible, and the sensing part of the displacement sensor 23 can detect the expansion displacement of the battery under test.

[0043] It should be noted that the pressure assembly 20 also includes a temperature sensor, which is located on the sensing part of the displacement sensor 23, so that the temperature sensor can contact the battery under test in the same way as the sensing part of the displacement sensor 23 to obtain the temperature of the battery under test. The probe of the temperature sensor can be made of a high-temperature resistant material, requiring a temperature resistance exceeding 300°C.

[0044] The recycling box 70 is located within the second receiving cavity 602. The recycling box 70 is positioned below the support plate 11, and its opening corresponds to the open end 101. The recycling box 70 contains fire extinguishing sand.

[0045] The gas detection component 50 is located outside the housing 60. The gas detection component 50 is connected to the pressure relief valve of the battery under test through a pipe, so that the gas detection component 50 can detect the amount of gas discharged by the battery under test.

[0046] Battery testing device operation process: S10, open the cover, place the battery under test on the support platform 10 in the first accommodating cavity 601, and then close the cover. S20, the movable end 31 of the pressure member 30 moves closer to the support platform 10 until the pressure plate 21 presses against the battery under test, so that the battery under test is subjected to a pre-tightening force. S30, continuously inject hot air into the first accommodating cavity 601, or heat the air in the first accommodating cavity 601 through the heating member, so that the temperature of the battery under test rises to the target temperature. The battery under test generates gas inside at high temperature and expands until it explodes. During this process, the sensing part of the displacement sensor 23 can obtain the expansion displacement of the battery under test in real time, and the temperature sensor can obtain the temperature change of the battery under test in real time. In this way, the magnitude and change of the expansion displacement of the battery under test during the process of rising from the normal temperature to the target temperature can be obtained. Under the expansion of the battery under test, the pressure plate 21 moves upward and presses against the pressure sensor 24. The pressure sensor 24 acquires the change in the upward force applied by the pressure plate 21 in real time to determine the start and end times of the venting of the battery under test. This allows the test operator to observe the expansion changes of the battery under test in a timely manner and to be notified when the expansion of the battery under test has ended. During the process from the start to the end of the venting of the battery under test, the gas detection component 50 collects the gas emitted by the battery under test and acquires the amount of gas emitted. S40, when the displacement sensor 23 detects that the expansion displacement of the battery under test exceeds 50% or the temperature exceeds the target temperature, the support plate 11 of the support platform 10 switches from the first position to the second position, causing the battery under test to fall into the recovery box 70, and the fire extinguishing sand prevents the battery under test from going out of control and exploding.

[0047] This embodiment utilizes a displacement sensor to acquire the expansion displacement of the battery under test in real time, and a temperature sensor to acquire the temperature change of the battery under test in real time. This allows for the acquisition of the magnitude and change of expansion displacement as the battery under test rises from its normal temperature to the target temperature. A gas detection component 50 collects the gas emitted by the battery under test and acquires the gas emission volume. This provides parameters such as expansion displacement, gas production, and temperature change during the battery under test testing process, offering parameter support to developers and improving battery safety performance. Furthermore, before the battery under test experiences thermal runaway and explodes, it is automatically retrieved and fire extinguished, enhancing safety during the testing process.

[0048] As an implementation method, the pressure assembly 20 is provided with a plurality of displacement sensors 23, which are arranged around the pressure sensor 24.

[0049] like Figure 3 As shown, the connecting plate 22 has four second sliding grooves 221 arranged around the pressure sensor 24, each extending in the left-right direction. The pressure plate 21 has four first sliding grooves 211 arranged around the pressure sensor 24, each extending in the left-right direction. The first sliding grooves 211 correspond to the second sliding grooves 221.

[0050] The displacement sensor 23 is elongated. The displacement sensor 23, the first slide groove 211, and the second slide groove 221 correspond one-to-one. The displacement sensor 23 passes through the first slide groove 211 and the second slide groove 221, sliding left and right along these slide grooves. A limiting block 25 is provided at the upper end of the displacement sensor 23, which engages with the second slide groove 221 to prevent the displacement sensor 23 from detaching from the first slide groove 211 and the second slide groove 221.

[0051] With this configuration, the displacement sensor 23 is movably connected to the pressure plate 21 and the connecting plate 22, and the distance between the displacement sensor 23 and the pressure sensor 24 is adjustable, thus adapting to batteries of different sizes to be tested.

[0052] As an alternative implementation, the support platform 10 also includes a telescopic rod 12, which corresponds one-to-one with the support plate 11. One end of the telescopic rod 12 is hinged to the cavity wall of the second accommodating cavity 602, and the other end is connected to the support plate 11, so that the support plate 11 can swing back and forth between the horizontal and vertical positions.

[0053] like Figure 5 As shown, both the left and right support plates 11 are hinged to the mounting holes 41. The left support plate 11 is correspondingly paired with a telescopic rod 12, one end of which is hinged to the wall of the second accommodating cavity 602, and the other end to the support plate 11. Similarly, the right support plate 11 is also correspondingly paired with a telescopic rod 12, one end of which is hinged to the wall of the second accommodating cavity 602, and the other end to the support plate 11. The telescopic rod 12 controls the switching between horizontal and vertical positions of the support plate 11.

[0054] With this configuration, the carrier plate 11 can freely switch between horizontal and vertical positions to ensure that the battery under test that is about to explode is recovered by the recycling box 70 through the opening 101, thus avoiding the battery under test from exploding.

[0055] As a possible approach, such as Figure 7As shown, the gas detection component 50 includes a liquid storage container 51 and a liquid measuring container 52. The liquid measuring container 52 is provided with scale lines. The liquid storage container 51 is connected to the pressure relief valve of the battery under test through a connecting pipe 53. The liquid storage container 51 and the liquid measuring container 52 are connected through a drain pipe 54.

[0056] The gas detection component 50 can be used to quickly determine the amount of gas produced by the battery under test, and also make the result of the amount of gas produced by the battery under test closer to the true value.

[0057] It should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" used above to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0058] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the utility model involved in this application is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A battery testing device, characterized by, The utility model relates to a battery swelling test device, which comprises: a bearing table (10) for placing a battery to be tested; a pressing assembly (20) comprising a pressing plate (21) and a displacement sensor (23), the displacement sensor (23) being arranged on the pressing plate (21), and the sensing part of the displacement sensor (23) being capable of detecting the swelling displacement of the battery to be tested; a pressure applying member (30) having a movable end (31) connected to the pressing assembly (20), the movable end (31) being capable of reciprocating to drive the pressing plate (21) to move towards or away from the bearing table (10); a gas detection assembly (50) in communication with a pressure relief valve of the battery to be tested, so that the gas detection assembly (50) can detect the amount of gas discharged by the battery to be tested.

2. The battery testing device of claim 1, wherein, The pressing assembly (20) further comprises a connecting plate (22) and a pressure sensor (24), the movable end (31) of the pressure applying member (30) is connected to the connecting plate (22), and the pressure sensor (24) is clamped between the pressing plate (21) and the connecting plate (22), and the pressure sensor (24) is used to obtain the start time and end time of the exhaust of the battery to be tested.

3. The battery testing device of claim 2, wherein, The pressing assembly (20) is provided with a plurality of displacement sensors (23), and the plurality of displacement sensors (23) are arranged around the pressure sensor (24).

4. The battery testing device of claim 3, wherein, The displacement sensor (23) is movably connected to the pressing plate (21) and the connecting plate (22), and the distance between the displacement sensor (23) and the pressure sensor (24) is adjustable.

5. The battery testing device of claim 4, wherein, The connecting plate (22) is provided with a plurality of second sliding grooves (221), and the pressing plate (21) is provided with a plurality of first sliding grooves (211), the first sliding grooves (211) and the second sliding grooves (221) are correspondingly arranged, and the extending directions of the first sliding grooves (211) and the second sliding grooves (221) are the same, the displacement sensor (23) passes through the first sliding grooves (211) and the second sliding grooves (221) and slides along the first sliding grooves (211) and the second sliding grooves (221).

6. The battery testing device of any one of claims 1-5, wherein, The bearing table (10) comprises at least two bearing plates (11), the bearing plates (11) are capable of moving to have a first position and a second position, the bearing plates (11) are switched between the first position and the second position, and hover at the first position and the second position; when the bearing plates (11) are at the first position, the bearing plates (11) are spliced to form the bearing table (10); when the bearing plates (11) are at the second position, the bearing plates (11) form an opening (101) through which the battery to be tested passes.

7. The battery testing device of claim 6, wherein, The bearing table (10) comprises two bearing plates (11), the bearing plates (11) are arranged horizontally at the first position, the bearing plates (11) swing downward from the first position to the second position, or the bearing plates (11) slide in the horizontal direction to have the first position and the second position.

8. The battery testing device of claim 7, wherein, Further comprising a recycling box (70) located below the bearing plate (11), an opening of the recycling box (70) is arranged corresponding to the open mouth (101), and the recycling box (70) is internally provided with fire extinguishing sand.

9. The battery testing device of claim 8, wherein, Further comprising a box body (60) internally provided with a partition plate (40), the partition plate (40) divides the accommodating cavity of the box body (60) into a first accommodating cavity (601) and a second accommodating cavity (602) arranged in an upper and lower mode, The pressing assembly (20) and the pressing member (30) are located in the first accommodating cavity (601), the recycling box (70) is located in the second accommodating cavity (602), the partition plate (40) is provided with a mounting hole (41), and the bearing plate (11) is hinged to the mounting hole (41).

10. The battery testing device of any one of claims 1-5, wherein, The gas detection assembly (50) comprises a liquid storage container (51) and a liquid measuring container (52), the liquid measuring container (52) is provided with a scale line, The liquid storage container (51) is communicated with a pressure relief valve of the battery to be detected through a connecting pipe (53), and the liquid storage container (51) is communicated with the liquid measuring container (52) through a liquid discharge pipe (54).

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