Test device for the swelling effect of single cells

Abstract

The application relates to the battery technical field, in particular to a single cell expansion effect testing device. The single cell expansion effect testing device comprises a first clamping plate and a second clamping plate, the first clamping plate and the second clamping plate are clamped on the two sides of the thickness direction of a single cell, the first clamping plate is provided with first sliders slidable along a second direction on the two sides along a first direction, the second clamping plate is provided with second sliders slidable along the second direction on the two sides along the first direction, the first sliders and the second sliders on the same side are connected with fasteners, the first clamping plate and the second clamping plate clamp the cell, the state that the single cell is clamped between other two cells in a battery pack is simulated, and the position of the fastener can be adjusted according to simulation results, so that the expansion effect of the single cell in the actual use of the battery pack is effectively simulated, the effect of the equivalent battery pack is achieved, the safety and reliability of the battery are more accurately evaluated, and the test cost is effectively reduced.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a testing device for the expansion effect of a single cell. Background Technology

[0002] A lithium-ion battery module consists of multiple individual cells. During the cycle of charging and discharging, the cells expand due to internal chemical reactions and volume changes in the materials. This not only affects the cell's performance but may also lead to safety accidents. Therefore, expansion force testing of the cells is usually required during the battery manufacturing process.

[0003] Currently, battery modules are typically tested to obtain information about changes in their expansion force over their lifespan. However, directly testing the expansion force within a battery module is expensive. Therefore, it is particularly important to develop a testing device that can simulate the expansion behavior of individual cells within a battery module under various operating conditions. Utility Model Content

[0004] The purpose of this invention is to provide a testing device for the expansion effect of a single battery cell, so as to simulate the expansion effect of a single battery cell in actual use.

[0005] This utility model provides a testing device for the expansion effect of a single battery cell, including a first clamping plate, a second clamping plate, and fasteners; the first clamping plate and the second clamping plate are disposed opposite each other on both sides of the thickness direction of the battery cell to be tested; the battery cell also has a first direction and a second direction, wherein the first direction, the second direction, and the thickness direction of the battery cell are perpendicular to each other. The first clamping plate is provided with a first slider on both sides of the first direction, and the second clamping plate is provided with a second slider on both sides of the first direction. Both the first slider and the second slider can slide along the second direction. Both the first slider and the second slider have mounting holes, and the mounting holes of the first slider and the second slider on the same side can be coaxially aligned to allow the fastener to pass through, so that the first clamping plate and the second clamping plate hold the battery cell, and the position of the fastener is adjustable along the second direction.

[0006] Furthermore, the clamping plate assembly formed by the first clamping plate and the second clamping plate can be equipped with multiple fasteners on both sides of the first direction; One end of each fastener is connected to the first clamping plate via the first slider, and the other end of each fastener is connected to the second clamping plate via the second slider.

[0007] Furthermore, the single-cell expansion effect testing device also includes a first slide rail and a second slide rail; The first clamping plate is provided with the first slide rail on both sides in the first direction for mounting the first slider; The second clamping plate is provided with the second slide rail on both sides in the first direction for mounting the second slider; Both the first slide rail and the second slide rail are provided with multiple positioning holes at intervals along their own length direction. The positioning holes are used to insert slider positioning components.

[0008] Furthermore, the distance between any two adjacent positioning holes on the first slide rail is 2.5mm to 5mm; The distance between any two adjacent positioning holes on the second slide rail is 2.5 mm to 5 mm.

[0009] Furthermore, the single-cell expansion effect testing device also includes a middle plate and a force sensor; The middle plate is disposed parallel to and spaced between the first clamping plate and the second clamping plate. The middle plate is connected to the first clamping plate through the force sensor. The space between the middle plate and the second clamping plate is used to place the battery cell.

[0010] Furthermore, the testing device for the single-cell expansion effect also includes a thin-film sensor; The thin-film sensor is provided on the side of the middle plate and / or the second clamping plate facing the battery cell to monitor the expansion force of the battery cell.

[0011] Furthermore, the single-cell expansion effect testing device also includes a limiting component; The limiting component is disposed between the first clamping plate and the middle plate, and the limiting component includes a limiting rod and a limiting hole; One of the first clamping plate and the middle plate is provided with the limiting rod, and the other is provided with the limiting hole. The axes of the limiting rod and the limiting hole both extend along the thickness direction of the battery cell. One end of the limiting rod can be adapted to be inserted into the limiting hole, so that the limiting rod can move within the limiting hole along the axis of the limiting rod.

[0012] Furthermore, there are multiple limiting components, which are spaced apart circumferentially along the first clamping plate.

[0013] Furthermore, the single-cell expansion effect testing device also includes a first base plate and a second base plate; The first clamping plate is perpendicularly connected to the first base plate on the side opposite to the second clamping plate, and the second clamping plate is perpendicularly connected to the second base plate on the side opposite to the first clamping plate. The single-cell expansion effect testing device further includes a first reinforcing plate, with the first clamping plate connected to the first base plate; and / or, the single-cell expansion effect testing device further includes a second reinforcing plate, with the second clamping plate connected to the second base plate.

[0014] Furthermore, the surfaces of the first clamping plate, the second clamping plate, and the middle plate are all provided with an insulating material layer.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: The single-cell expansion effect testing device provided by this utility model includes a first clamping plate and a second clamping plate. For the single cell to be tested, the first clamping plate is disposed on one side of the cell's thickness direction, and the second clamping plate is disposed on the other side of the cell's thickness direction. The first clamping plate has first sliders that can slide along a second direction on both sides along a first direction, and the second clamping plate has second sliders that can slide along a second direction on both sides along the first direction. The first direction, the second direction, and the cell's thickness direction are mutually perpendicular. Fasteners connect the first and second sliders on the same side, allowing the first and second clamping plates to clamp the single cell. The test cell simulates the state of a single cell being sandwiched between two other cells in a battery pack. Simultaneously, the position of the fasteners between the first and second clamping plates can be adjusted based on the simulation results of the cell's expansion force within the battery pack and the individual cell's expansion force. This effectively simulates the expansion effect of a single cell during actual use within the battery pack and, to a certain extent, simulates the performance of the entire battery pack, achieving the effect of an equivalent battery pack. This allows for a more accurate assessment of battery safety and reliability, providing reliable experimental data for optimized battery design and safe use, and effectively reducing testing costs. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 A first-view structural schematic diagram of the single-cell expansion effect testing device provided in an embodiment of this utility model; Figure 2 This is a schematic diagram of the single-cell expansion effect testing device provided in an embodiment of the present invention from a second perspective.

[0018] Figure label: 1-First clamping plate, 11-First slide rail, 12-First slider, 13-First base plate, 14-First reinforcing plate, 15-Limiting rod, 2-Second clamping plate, 21-Second slide rail, 22-Second slider, 23-Positioning hole, 24-Second base plate, 25-Second reinforcing plate, 3-Middle plate, 31-Limiting hole, 4-Battery cell, 5-Force sensor, 6-Fastener, 7-Mounting hole; a - First direction, b - Second direction. Detailed Implementation

[0019] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0020] The components of the present invention embodiments described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0021] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0022] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship 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," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] The following reference Figure 1 and Figure 2 This application describes a test apparatus for single-cell expansion effect according to some embodiments.

[0025] This application provides a testing device for the single-cell expansion effect, such as... Figures 1 to 2 As shown, the single-cell expansion effect testing device includes a first clamping plate 1 and a second clamping plate 2. For the single cell 4 to be tested, the first clamping plate 1 is disposed on one side of the thickness direction of the cell 4, and the second clamping plate 2 is disposed on the other side of the thickness direction of the cell 4. The first clamping plate 1 and the second clamping plate 2 are connected by fasteners 6 so that the cell 4 is stably clamped between the first clamping plate 1 and the second clamping plate 2, simulating the state of the single cell 4 to be tested being clamped between two other cells 4 in the battery pack. At the same time, the position of the fasteners 6 between the first clamping plate 1 and the second clamping plate 2 is adjustable along the length direction of the cell 4 (i.e., the second direction b).

[0026] During actual testing, the position of fastener 6 is adjusted according to the simulation results. Specifically, before testing the expansion behavior of a single cell 4, the expansion force of the entire battery pack is simulated using simulation software. The simulation results will show the displacement distribution of each cell 4 in the battery pack at the end of its life.

[0027] Next, the expansion force of a single cell 4 is simulated using simulation software. The simulation software is equipped with a fixture model to simulate the actual testing device (i.e., the testing device provided in this application). During the simulation, the position of the fixed point (i.e. the fastener 6) of the fixture model is adjusted so that the simulation result of the single cell 4 matches the displacement result of the corresponding cell 4 in the battery pack, so as to ensure that the simulation of the single cell 4 can accurately reflect the actual performance of the corresponding cell 4 in the battery pack.

[0028] Next, actual testing of the single cell is carried out. The cell 4 is clamped between the first clamping plate 1 and the second clamping plate 2, and the position of the fastener 6 is adjusted according to the position of the fixing point obtained from the simulation results. The testing device is adjusted to be consistent with the fixture model. In this way, when the single cell 4 is tested, such as testing the expansion behavior of the cell 4 under different temperatures, different charge and discharge rates, or different cycle conditions, the expansion effect of the single cell 4 when it is actually used in the battery pack can be effectively simulated. It can also simulate the performance of the entire battery pack to a certain extent, achieving the effect of an equivalent battery pack. This allows for a more accurate evaluation of the battery's safety and reliability, provides reliable experimental data for the optimized design and safe use of the battery, and effectively reduces testing costs.

[0029] Regarding the adjustable position of the fastener 6, in one embodiment of this application, preferably, the first clamping plate 1 is provided with a first slider 12 on both sides of the first direction a, and the second clamping plate 2 is provided with a second slider 22 on both sides of the first direction a, and each first slider 12 and second slider 22 can slide along the second direction b; wherein the second direction b is the length direction of the battery cell 4, and the first direction a is the width direction of the battery cell 4.

[0030] Each of the first slider 12 and the second slider 22 is provided with a mounting hole 7. For the first slider 12 and the second slider 22 on the same side, they can be adjusted to the same height along the second direction b so that the mounting holes 7 are coaxial and opposite, so that a fastener 6 can be inserted between the first slider 12 and the second slider 22. Thus, the first clamping plate 1 and the second clamping plate 2 are connected together by the fastener 6 to form a clamping of the battery cell 4. At the same time, the position of the fastener 6 can be adjusted along the second direction b according to the position of the fixing point of the fixture model obtained by simulation test.

[0031] In this embodiment, preferably, for the clamping assembly formed by the first clamping plate 1 and the second clamping plate 2 for clamping the battery cell 4, multiple fasteners 6 can be installed on both sides of the first direction a, and the multiple fasteners 6 on the same side are spaced apart along the second direction b; thereby ensuring the installation stability of the first clamping plate 1 and the second clamping plate 2 on both sides of the battery cell 4, and also making the clamping assembly formed by the first clamping plate 1 and the second clamping plate 2 have multiple fixing points on both sides of the first direction a, so as to meet the fixing point setting requirements of the simulation results.

[0032] Specifically, in the case where multiple fasteners 6 are provided on one side, the multiple fasteners 6 are spaced apart along the second direction b. The mounting holes 7 of the multiple fasteners 6 on the first clamping plate 1 can be formed on one first slider 12 or on multiple first sliders 12. For example, when the number of fasteners 6 is three, the number of first sliders 12 can be one, with three mounting holes 7 spaced apart along the second direction b on one first slider 12; the number of first sliders 12 can also be two, with one first slider 12 having two mounting holes 7 spaced apart along the second direction b, and the other first slider 12 having one mounting hole 7; the number of first sliders 12 can also be three, with each first slider 12 having one mounting hole 7. The mounting of the multiple fasteners 6 on the second clamping plate 2 is also similar, and will not be described in detail here.

[0033] In this embodiment, preferably, the first clamping plate 1 has a first slide rail 11 on both sides of the first direction a, the first slide rail 11 is used to install the first slider 12, and the first slide rail 11 is arranged along the second direction b, so that the first slider 12 can slide on the first slide rail 11 along the second direction b; the second clamping plate 2 has a second slide rail 21 on both sides of the first direction a, the second slide rail 21 is used to install the second slider 22, and the second slide rail 21 is arranged along the second direction b, so that the second slider 22 can slide on the second slide rail 21 along the second direction b.

[0034] Both the first slide rail 11 and the second slide rail 21 are provided with multiple positioning holes 23. The multiple positioning holes 23 on the first slide rail 11 are spaced apart along the length direction of the first slide rail 11, and the multiple positioning holes 23 on the second slide rail 21 are spaced apart along the length direction of the second slide rail 21. For example, the distance between any two adjacent positioning holes 23 on the same slide rail is 2.5mm to 5mm.

[0035] In actual operation, when the position of the fastener 6 is adjusted to the required position, that is, when the first slider 12 and the second slider 22 at both ends of the fastener 6 are adjusted to the required position, a positioning pin is inserted into the positioning hole 23 on both sides of the first slider 12 and the second slider 22. The positioning pin is used to restrict the continued sliding of the first slider 12 and the second slider 22, so as to ensure that the fastener 6 is stably fixed at the required fixed point during the test.

[0036] In one embodiment of this application, preferably, the single-cell expansion effect testing device further includes a middle plate 3 and a force sensor 5. The middle plate 3 is disposed parallel to and spaced between the first clamping plate 1 and the second clamping plate 2, and the middle plate 3 is connected to the first clamping plate 1 through the force sensor 5. When testing the cell 4, the cell 4 is clamped between the middle plate 3 and the second clamping plate 2, thereby enabling the force sensor to monitor the expansion force of the cell 4.

[0037] In this embodiment, preferably, at least one of the middle plate 3 and the second clamping plate 2 is provided with a thin-film sensor on the side facing the battery cell 4, so as to monitor the expansion force of the battery cell 4 during testing by means of the thin-film sensor, thereby improving the reliability of the test data.

[0038] In this embodiment, preferably, the middle plate 3 is movably disposed between the first clamping plate 1 and the second clamping plate 2 along the thickness direction of the battery cell 4, so that when the battery cell 4 expands, the middle plate 3 can move under the push of the battery cell 4, thereby enabling the force sensor 5 to detect the expansion force of the battery cell 4.

[0039] Preferably, a limiting assembly is provided between the first clamping plate 1 and the middle plate 3. The limiting assembly includes a limiting rod 15 and a limiting hole 31. One of the first clamping plate 1 and the middle plate 3 is provided with the limiting rod 15, and the other is provided with the limiting hole 31. For example, one end of the limiting rod 15 is connected to the first clamping plate 1, and the length direction of the limiting rod 15 extends along the thickness direction of the battery cell 4. The middle plate 3 is provided with a limiting hole 31 at a position opposite to the limiting rod 15. The end of the limiting rod 15 facing the middle plate 3 can be fitted into the limiting hole 31 in a clearance fit manner. Thus, through the cooperation of the limiting hole 31 and the limiting rod 15, the movement of the middle plate 3 is limited, so that the middle plate 3 can move along the thickness direction of the battery cell 4 without moving in other directions.

[0040] Preferably, there are multiple limiting components, which are spaced apart circumferentially along the first clamping plate 1. This provides stable guidance for the movement of the middle plate 3 through multiple limiting components, thereby ensuring the reliability of the test results of the force sensor 5.

[0041] In this embodiment, preferably, the first clamping plate 1 is vertically connected to the first base plate 13 on the side opposite to the second clamping plate 2, and the second clamping plate 2 is vertically connected to the second base plate 24 on the side opposite to the first clamping plate 1. By setting the first base plate 13 and the second base plate 24, the first clamping plate 1 and the second clamping plate 2 can be stably installed on both sides of the battery cell 4 to achieve stable clamping of the battery cell 4. At the same time, a first reinforcing plate 14 is connected between the first clamping plate 1 and the first base plate 13 to further enhance the stability of the first clamping plate 1 on one side of the battery cell 4 during testing, thereby ensuring the accuracy of the test results. Similarly, a second reinforcing plate 25 can also be set between the second clamping plate 2 and the second base plate 24.

[0042] In this embodiment, preferably, the surfaces of the first clamping plate 1, the second clamping plate 2, and the middle plate 3 are all provided with an insulating material layer, such as an insulating Teflon layer, to ensure the safety of the testing process.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A testing device for single-cell expansion effect, characterized in that, Includes a first clamping plate (1), a second clamping plate (2), and fasteners (6); The first clamping plate (1) and the second clamping plate (2) are disposed opposite to each other on both sides of the thickness direction of the battery cell (4) to be tested; the battery cell (4) also has a first direction (a) and a second direction (b), the first direction (a), the second direction (b) and the thickness direction of the battery cell (4) are perpendicular to each other. The first clamping plate (1) is provided with a first slider (12) on both sides of the first direction (a), and the second clamping plate (2) is provided with a second slider (22) on both sides of the first direction (a). The first slider (12) and the second slider (22) can slide along the second direction (b). The first slider (12) and the second slider (22) are provided with mounting holes (7), and the mounting holes (7) of the first slider (12) and the second slider (22) on the same side can be coaxially opposite to each other so as to pass through the fastener (6) so that the first clamping plate (1) and the second clamping plate (2) clamp the battery cell (4), and the position of the fastener (6) is adjustable along the second direction (b).

2. The testing apparatus for single-cell expansion effect according to claim 1, characterized in that, The clamp assembly formed by the first clamp (1) and the second clamp (2) can be equipped with a plurality of fasteners (6) on both sides of the first direction (a). One end of each of the fasteners (6) is connected to the first clamping plate (1) via the first slider (12), and the other end of each of the fasteners (6) is connected to the second clamping plate (2) via the second slider (22).

3. The testing apparatus for single-cell expansion effect according to claim 1, characterized in that, The single cell expansion effect testing device also includes a first slide rail (11) and a second slide rail (21). The first clamping plate (1) is provided with the first slide rail (11) on both sides of the first direction (a) for mounting the first slider (12). The second clamping plate (2) is provided with the second slide rail (21) on both sides of the first direction (a) for mounting the second slider (22); Both the first slide rail (11) and the second slide rail (21) are provided with a plurality of positioning holes (23) spaced apart along their own length direction. The positioning holes are used to insert the slider positioning component.

4. The testing apparatus for single-cell expansion effect according to claim 3, characterized in that, The distance between any two adjacent positioning holes (23) on the first slide rail (11) is 2.5 mm to 5 mm; The distance between any two adjacent positioning holes (23) on the second slide rail (21) is 2.5 mm to 5 mm.

5. The testing apparatus for single-cell expansion effect according to claim 1, characterized in that, The single-cell expansion effect testing device also includes a middle plate (3) and a force sensor (5); The middle plate (3) is arranged in parallel between the first clamping plate (1) and the second clamping plate (2). The middle plate (3) is connected to the first clamping plate (1) through the force sensor (5). The middle plate (3) and the second clamping plate (2) are used to place the battery cell (4).

6. The testing apparatus for single-cell expansion effect according to claim 5, characterized in that, The testing device for the single-cell expansion effect also includes a thin-film sensor; The thin-film sensor is provided on the side of the middle plate (3) and / or the second clamping plate (2) facing the cell (4) to monitor the expansion force of the cell (4).

7. The testing apparatus for single-cell expansion effect according to claim 5, characterized in that, The testing device for the single-cell expansion effect also includes a limiting component; The limiting component is disposed between the first clamping plate (1) and the middle plate (3), and the limiting component includes a limiting rod (15) and a limiting hole (31). One of the first clamping plate (1) and the middle plate (3) is provided with the limiting rod (15), and the other is provided with the limiting hole (31). The axes of the limiting rod (15) and the limiting hole (31) extend along the thickness direction of the battery cell (4). One end of the limiting rod (15) can be adapted to be inserted into the limiting hole (31), so that the limiting rod (15) can move along the axis direction of the limiting rod (15) within the limiting hole (31).

8. The testing apparatus for single-cell expansion effect according to claim 7, characterized in that, The number of limiting components is multiple, and the multiple limiting components are arranged at intervals along the circumference of the first clamping plate (1).

9. The testing apparatus for single-cell expansion effect according to claim 1, characterized in that, The single cell expansion effect testing device also includes a first base plate (13) and a second base plate (24). The first clamping plate (1) is vertically connected to the first base plate (13) on the side away from the second clamping plate (2), and the second clamping plate (2) is vertically connected to the second base plate (24) on the side away from the first clamping plate (1). The single cell expansion effect testing device also includes a first reinforcing plate (14), and the first reinforcing plate (1) is connected to the first base plate (13). And / or, the single cell expansion effect testing device further includes a second reinforcing plate (25), and the second reinforcing plate (2) is connected between the second clamping plate (2) and the second base plate (24).

10. The testing apparatus for single-cell expansion effect according to claim 5, characterized in that, The surfaces of the first clamping plate (1), the second clamping plate (2), and the middle plate (3) are all provided with an insulating material layer.

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