Battery testing device and battery testing method

Abstract

The embodiment of the invention provides a battery testing device and a battery testing method, and belongs to the technical field of battery testing. The battery testing device comprises a shell assembly which at least partially stretches out and draws back; the clamping mechanism is arranged in the shell assembly in a sliding mode, part of the clamping mechanism rotates relative to the shell assembly, and the clamping mechanism is provided with a clamping space used for clamping a to-be-tested battery; the clamping space is configured to rotate or move relative to the shell assembly along with the clamping mechanism, or increase or decrease along with stretching and retracting of the shell assembly; and the pressure applying mechanism is connected to the clamping mechanism so as to apply pressure to the clamping space through the clamping mechanism. According to the battery testing device, the posture of the to-be-tested battery can be simultaneously adjusted through a single device, and the pre-tightening force can also be applied to the to-be-tested battery, so that various parameter testing is realized, the device does not need to be replaced, and the battery testing is more convenient and faster.

Description

Technical Field

[0001] This application relates to the technical field of battery testing, and particularly to a battery testing device and a battery testing method. Background Art

[0002] The electrolyte breathing effect of a battery refers to that during the charge and discharge cycle of the battery, the battery expands, and under the action of the expansion stress, the electrolyte inside the battery is extruded and inhaled, resulting in uneven distribution, which causes adverse reactions in the battery.

[0003] In the prior art, by placing the battery on different testing devices, parameters such as the position, stress, and strain of the battery are respectively regulated to observe the electrolyte breathing effect of the battery.

[0004] Therefore, the existing battery testing operation is relatively inconvenient. Summary of the Invention

[0005] Embodiments of this application provide a battery testing device and a battery testing method to solve the problem of inconvenient existing battery testing.

[0006] In a first aspect, embodiments of this application provide a battery testing device, including:

[0007] A housing assembly, at least part of the housing assembly is telescopic;

[0008] A clamping mechanism, the clamping mechanism is slidably arranged in the housing assembly and partially rotates relative to the housing assembly. The clamping mechanism has a clamping space for clamping the battery to be tested;

[0009] The clamping space is configured to increase or decrease as the clamping mechanism rotates or moves relative to the housing assembly, or as the housing assembly expands or contracts;

[0010] A pressure applying mechanism, the pressure applying mechanism is connected to the clamping mechanism to apply pressure to the clamping space through the clamping mechanism.

[0011] In a possible implementation manner, for the battery testing device provided by embodiments of this application, the clamping mechanism includes:

[0012] A crank-slider assembly, two crank-slider assemblies are oppositely arranged, both of the two crank-slider assemblies are slidably connected to the housing assembly, and the sliding directions of the two crank-slider assemblies are different. The pressure applying mechanism is connected to at least one crank-slider assembly;

[0013] Two pressing plates, the two pressing plates are arranged in parallel and are hinged to the corresponding crank-slider assemblies. A clamping space is formed between the two pressing plates.

[0014] In a possible implementation manner, for the battery testing device provided by embodiments of this application, the crank-slider assembly includes:

[0015] A guide post, which is slidably connected to the housing assembly, and a slider is arranged on the guide post;

[0016] A stress rod, which is slidably connected to the slider and hinged to the pressing plate;

[0017] A crank, which is hinged to the slider, and the crank is arranged obliquely relative to the stress rod and hinged to the pressing plate;

[0018] The stress rod is configured to drive the pressing plate to move by sliding with the slider along with the guide post relative to the housing assembly, and slide relative to the slider to make the pressing plate rotate.

[0019] In a possible implementation manner, for the battery testing device provided by the embodiment of the present application, the length of the crank is less than or equal to the length of the stress rod.

[0020] In a possible implementation manner, for the battery testing device provided by the embodiment of the present application, in two crank-slider assemblies, one of the guide posts slides relative to the housing assembly along a first direction;

[0021] The other guide post slides along an arc tangent to the first direction or along a straight line obliquely intersecting the first direction.

[0022] In a possible implementation manner, for the battery testing device provided by the embodiment of the present application, in two crank-slider assemblies, the extending directions of the stress rods are all consistent with the first direction, and each stress rod slides relative to the slider along the first direction.

[0023] In a possible implementation manner, for the battery testing device provided by the embodiment of the present application, the first direction is the vertical direction.

[0024] In a possible implementation manner, for the battery testing device provided by the embodiment of the present application, in the same crank-slider assembly, at least two sliders, stress rods and cranks are correspondingly arranged.

[0025] In a possible implementation manner, for the battery testing device provided by the embodiment of the present application, the pressing mechanism includes at least one pressing member, and the pressing member is correspondingly connected to the stress rod and applies pressure to the stress rod.

[0026] In a possible implementation manner, for the battery testing device provided by the embodiment of the present application, the housing assembly includes:

[0027] An upper housing;

[0028] A lower housing, and a set of crank-slider assemblies are respectively arranged on the lower housing and the upper housing;

[0029] An adjustable guide post, which is slidably connected to the upper housing and the lower housing to make the upper housing and the lower housing approach or separate from each other.

[0030] In a possible implementation, for the battery testing device provided by the embodiments of the present application, a plurality of adjustable guide posts are provided, and the plurality of adjustable guide posts are sequentially arranged at intervals between the upper housing and the lower housing.

[0031] In a possible implementation, the battery testing device provided by the embodiments of the present application further includes a detection component, and the detection component is arranged on the clamping mechanism for detecting the pressure applied to the clamping space and / or the relative displacement of the clamping space.

[0032] In a possible implementation, the battery testing device provided by the embodiments of the present application further includes a locking component, and the locking component is correspondingly arranged with the clamping mechanism for locking the clamping space in a preset pose or unlocking it.

[0033] In a second aspect, the embodiments of the present application provide a battery testing method applied to the above battery testing device. The battery testing method includes:

[0034] Placing the battery to be tested into the clamping space;

[0035] Adjusting the pose of the battery to be tested through the clamping mechanism;

[0036] Adjusting the gap between the clamping space and the battery to be tested by telescoping at least part of the housing assembly, and / or adjusting the pressure applied to the battery to be tested by the pressure applying mechanism;

[0037] Testing the corresponding parameters of the battery to be tested.

[0038] For the battery testing device and the battery testing method provided by the embodiments of the present application, the battery testing device includes a housing assembly, a clamping mechanism and a pressure applying mechanism. By providing a telescopic housing assembly and arranging a clamping mechanism with a clamping space on the housing assembly, the battery to be tested can be clamped through the clamping space, and the clamping mechanism itself can slide or rotate relative to the housing assembly, so that the clamping space and the battery to be tested can move or rotate accordingly, thereby adjusting the pose of the battery to be tested. And when part of the housing assembly telescopes, the size of the clamping space can also be adjusted by the telescoping of the housing assembly, thereby adjusting the gap parameter between the battery to be tested and the clamping space. The pressure applying mechanism is connected to the clamping mechanism so that the pressure applying mechanism can apply pressure to the clamping space through the clamping mechanism, thereby applying a pre-tightening force to the battery to be tested. In this way, the battery testing device provided by the embodiments of the present application can simultaneously adjust the pose of the battery to be tested through a single device and can also apply a pre-tightening force to the battery to be tested, so as to realize the testing of multiple parameters without replacing the device, making the battery testing more convenient and fast. Description of the Drawings

[0039] The drawings here are incorporated into the description and form a part of this description, showing embodiments consistent with the present application and used together with the description to explain the principles of the present application.

[0040] Figure 1 Schematic structural diagram of the battery testing device provided by an embodiment of the present application;

[0041] Figure 2 is Figure 1 Schematic structural diagram of another perspective of the battery testing device in

[0042] Figure 3 is Figure 2 A-A cross-sectional view of the battery testing device in

[0043] Figure 4 Schematic flow chart of the battery testing method provided by an embodiment of the present application.

[0044] Description of reference numerals:

[0045] 100 - housing assembly; 110 - upper housing; 111 - first slide rail; 120 - lower housing; 121 - second slide rail; 130 - adjustable guide post;

[0046] 200 - clamping mechanism; 210 - crank-slider assembly; 211 - guide post; 2111 - slider; 212 - stress rod; 213 - crank; 220 - pressing plate; 221 - clamping space;

[0047] 300 - pressing mechanism; 310 - pressing member;

[0048] 400 - detection assembly; 410 - pressure detection member; 420 - displacement detection member;

[0049] 500 - battery under test.

[0050] Through the above-mentioned drawings, specific embodiments of the present application have been shown, and there will be more detailed descriptions hereinafter. These drawings and written descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. Detailed Description of the Invention

[0051] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention. Without conflict, the following embodiments and the features in the embodiments may be combined with each other.

[0052] Batteries, especially lithium-ion batteries, will expand during the charge and discharge cycle. The reason is that during the charge and discharge process, the extraction and insertion of lithium ions cause the material to undergo expansion or contraction deformation, accompanied by stress changes, resulting in battery expansion. Moreover, as the battery charge and discharge cycle progresses, factors such as the thickening of the SEI film inside the battery, gas generation accompanying the battery electrochemical reaction, swelling of the battery separator, and lithium deposition or co-insertion of solvated ions under extreme conditions will all cause strain and stress transformation of the battery electrode sheet, which will also lead to battery expansion.

[0053] When the battery expands and contracts, affected by stress, the electrolyte inside the battery will be extruded and inhaled accordingly, resulting in uneven distribution of the electrolyte inside the battery cell, further promoting adverse reactions such as lithium deposition in the battery. This phenomenon is called the breathing effect of the electrolyte.

[0054] In the prior art, by placing the battery on different test devices, parameters such as the pose, stress, and strain of the battery are adjusted respectively to observe the breathing effect of the battery electrolyte. For example, the battery is placed on a device with an adjustable pose to test the influence of gravity on the breathing effect of the electrolyte; or the battery can be placed on a horizontally clamped device to test the breathing effect of the battery under constant pressure or constant gap conditions.

[0055] However, the existing battery tests cannot achieve the adjustment of multiple parameters through a single device. When it is necessary to test multiple aspects of parameters of the battery under test, multiple test devices need to be replaced, making the battery test inconvenient.

[0056] In order to overcome the defects in the prior art, the battery test device and battery test method provided in the embodiments of the present application. The battery test device includes a housing assembly, a clamping mechanism, and a pressing mechanism. By setting a telescopic housing assembly and providing a clamping mechanism with a clamping space on the housing assembly, the battery under test can be clamped through the clamping space. The clamping mechanism itself can slide or rotate relative to the housing assembly, so that the clamping space and the battery under test can move or rotate accordingly, thereby adjusting the pose of the battery under test. And when part of the housing assembly expands and contracts, the size of the clamping space can also be adjusted by the expansion and contraction of the housing assembly, thereby adjusting the gap parameter between the battery under test and the clamping space. The pressing mechanism is connected to the clamping mechanism so that the pressing mechanism can apply pressure to the clamping space through the clamping mechanism, thereby applying a pre-tightening force to the battery under test. In this way, the battery test device provided in the embodiments of the present application can simultaneously adjust the pose of the battery under test through a single device, and can also apply a pre-tightening force to the battery under test, so as to realize the test of multiple parameters without replacing the device, making the battery test more convenient and fast.

[0057] The content of the present invention will be described in detail below with reference to the accompanying drawings, so that those skilled in the art can understand the content of the present invention more clearly and in detail.

[0058] In some embodiments, as shown with reference to Figures 1 to 3 , an embodiment of the present application provides a battery testing device, including:

[0059] A housing assembly 100, at least part of the housing assembly 100 is telescopic;

[0060] A clamping mechanism 200, the clamping mechanism 200 is slidably disposed in the housing assembly 100 and is partially rotatable relative to the housing assembly 100. The clamping mechanism 200 has a clamping space 221 for clamping a battery 500 to be tested;

[0061] The clamping space 221 is configured to increase or decrease as the clamping mechanism 200 rotates or moves relative to the housing assembly 100, or as the housing assembly 100 expands or contracts;

[0062] A pressing mechanism 300, the pressing mechanism 300 is connected to the clamping mechanism 200 to apply a pressure to the clamping space 221 through the clamping mechanism 200.

[0063] It can be understood that the clamping mechanism 200 is provided on the housing assembly 100 to ensure support for the clamping mechanism 200 and ensure its structural stability. And at least part of the housing assembly 100 itself is telescopic, and at least part of the clamping mechanism 200 is connected to the telescopic part of the housing assembly 100. Then, when the housing assembly 100 expands or contracts, the clamping mechanism 200 can be driven to move together, so that the structural posture of the clamping mechanism 200 is adjusted to meet the test requirements for the battery 500 to be tested.

[0064] Among them, the clamping mechanism 200 is slidably disposed in the housing assembly 100, and is partially rotatable relative to the housing assembly 100. And the clamping mechanism 200 has a clamping space 221 for clamping the battery 500 to be tested. Thus, when the clamping mechanism 200 slides or rotates relative to the housing assembly 100, the clamping space 221 can be driven to slide or rotate together with the clamping mechanism 200, so that the position and posture of the battery 500 to be tested in the clamping space 221 can be adjusted, facilitating relevant tests that require adjusting the battery position and posture for the battery 500 to be tested.

[0065] Moreover, a pressing mechanism 300 is further connected to the clamping mechanism 200. By using the pressing mechanism 300 to apply a pressure to the clamping space 221, and the pressure in the clamping space 221 further acts on the battery 500 to be tested, a pre-tightening force can be applied to the battery 500 to be tested, facilitating relevant tests that require applying a pre-tightening force to the battery 500 to be tested.

[0066] Therefore, the battery testing device provided by the embodiments of the present application includes a housing assembly 100, a clamping mechanism 200, and a pressing mechanism 300. By providing a telescopic housing assembly 100 and arranging a clamping mechanism 200 with a clamping space 221 on the housing assembly 100, the battery 500 to be tested can be clamped through the clamping space 221. The clamping mechanism 200 itself can slide or rotate relative to the housing assembly 100, so that the clamping space 221 and the battery 500 to be tested can move or rotate accordingly, thereby adjusting the pose of the battery 500 to be tested. And when a part of the housing assembly 100 is telescoped, the size of the clamping space 221 can also be adjusted by the telescoping of the housing assembly 100, thereby adjusting the gap parameter between the battery 500 to be tested and the clamping space 221. The pressing mechanism 300 is connected to the clamping mechanism 200 so that the pressing mechanism 300 can apply pressure to the clamping space 221 through the clamping mechanism 200, thereby applying a pre-tightening force to the battery 500 to be tested.

[0067] In this way, the battery testing device provided by the embodiments of the present application can adjust the pose of the battery 500 to be tested through a single device and can also apply a pre-tightening force to the battery 500 to be tested, so as to realize the testing of multiple parameters without replacing the device, making the battery testing more convenient and fast.

[0068] In some embodiments, as shown in Figures 1 to 3 the clamping mechanism 200 includes:

[0069] A crank-slider assembly 210. Two crank-slider assemblies 210 are arranged oppositely. Both of the two crank-slider assemblies 210 are slidably connected to the housing assembly 100, and the sliding directions of the two crank-slider assemblies 210 are different. The pressing mechanism 300 is connected to at least one crank-slider assembly 210;

[0070] Two pressing plates 220. The two pressing plates 220 are arranged in parallel. The pressing plates 220 are hinged to the corresponding crank-slider assemblies 210, and a clamping space 221 is formed between the two pressing plates 220.

[0071] It can be understood that the two oppositely arranged crank-slider assemblies 210 are respectively slidably connected to the housing assembly 100 along different sliding directions. The two parallel pressing plates 220 are respectively connected to the crank-slider assemblies 210 and form a clamping space 221. In this way, it is convenient to control the sliding or rotation of a single crank-slider assembly 210 relative to the housing assembly 100 to drive the movement or rotation of the pressing plate 220, so as to realize the pose adjustment of the clamping space 221 and the battery 500 to be tested.

[0072] The different sliding directions of the two crank-slider assemblies 210 can make the pose adjustment of the clamping space 221 and the battery 500 to be tested more flexible, meeting various pose requirements during battery testing.

[0073] Connecting the pressing mechanism 300 to at least one crank-slider assembly 210 enables the pressing mechanism 300 to apply pressure to the pressing plate 220 through the crank-slider assembly 210, with a relatively simple, compact, and stable structure.

[0074] Among them, referring to Figures 1 to 3 as shown, the crank-slider assembly 210 includes:

[0075] A guide post 211, which is slidably connected to the housing assembly 100, and a slider 2111 is provided on the guide post 211;

[0076] A stress rod 212, which is slidably connected to the slider 2111 and is hinged to the pressing plate 220;

[0077] A crank 213, which is hinged to the slider 2111, and the crank 213 is inclined relative to the stress rod 212 and is hinged to the pressing plate 220;

[0078] The stress rod 212 is configured to drive the pressing plate 220 to move by sliding with the slider 2111 along with the guide post 211 relative to the housing assembly 100, and slide relative to the slider 2111 itself to make the pressing plate 220 rotate.

[0079] It can be understood that a first slide rail 111 and a second slide rail 121 are provided on the housing assembly 100. One guide post 211 is slidably connected to the first slide rail 111, and the other guide post 211 is slidably connected to the second slide rail 121. By setting the trajectories of the first slide rail 111 and the second slide rail 121 to be different, the two guide posts 211 slide in different directions.

[0080] A slider 2111 is fixedly connected to the guide post 211, and the stress rod 212 is slidably inserted into the slider 2111, so that the stress rod 212 can be perpendicular to the guide post 211 and slide relative to the guide post 211. The end of the stress rod 212 is hinged to the pressing plate 220, so that the pressing plate 220 can slide relative to the housing assembly 100 along with at least one of the guide post 211 or the stress rod 212 and rotate relative to the housing assembly 100.

[0081] Both ends of the crank 213 are respectively hinged to the slider 2111 on the guide post 211 and the pressure plate 220, and the crank 213 is inclined relative to the stress rod 212, so that the hinge axis between the crank 213 and the pressure plate 220 can be spaced from the hinge axis between the stress rod 212 and the pressure plate 220, making the hinge axis between the crank 213 and the slider 2111, the hinge axis between the crank 213 and the pressure plate 220, and the hinge axis between the stress rod 212 and the pressure plate 220 satisfy that the distance between any two of the above three hinge axes is greater than the difference between the distances of the third party from the two, and the distance between any two is less than the sum of the distances of the third party from the two, and the three can be distributed in a triangle, ensuring that the pressure plate 220 is stable and reliable when adjusting its pose.

[0082] Among them, referring to Figures 1 to 3 As shown, the length of the crank 213 is less than or equal to the length of the stress rod 212.

[0083] It can be understood that since the crank 213 is used to ensure the relative stability of the pose of the pressure plate 220, the crank-slider assembly 210 mainly adjusts the specific pose of the pressure plate 220 by the stress rod 212 sliding along the slider 2111. Therefore, setting the length of the crank 213 to be less than or equal to the length of the stress rod 212 can, on the one hand, enable the stress rod 212 to have a larger stroke, that is, enable a larger pose adjustment range of the pressure plate 220, and on the other hand, can also make the pose of the pressure plate 220 change significantly when the stress rod 212 moves, making the pose adjustment of the pressure plate 220 more convenient and fast.

[0084] In some embodiments, referring to Figures 1 to 3 As shown, in the two crank-slider assemblies 210, one of the guide posts 211 slides relative to the housing assembly 100 in the first direction;

[0085] The other guide post 211 slides along an arc tangent to the first direction, or slides along a straight line obliquely intersecting the first direction.

[0086] It can be understood that by setting like this, one of the guide posts 211 can translate in a single direction (i.e., the first direction), and the other guide post 211 translates in a composite direction relative to the previous guide post 211. The composite direction can be decomposed into the first direction and another direction perpendicular to the first direction. In this way, on the premise of ensuring the stable sliding of the two guide posts 211, it has a certain flexibility, which is convenient for realizing the increase or decrease of the distance between the two pressure plates 220, or the relative sliding of the two pressure plates 220 along parallel directions, meeting the battery test requirements.

[0087] Furthermore, in the two crank-slider assemblies 210, the extending directions of the respective stress rods 212 are all the same as the first direction, and each stress rod 212 slides relative to the slider 2111 in the first direction.

[0088] It can be understood that with such a setting, when the pressing plate 220 moves relative to the guiding column 211 along with the stress rod 212, or when the pressing plate 220 slides relative to the housing assembly 100 along with the guiding column 211 through the stress rod 212, the relative positional relationship between the two pressing plates 220 can be effectively ensured to be stable, so that the clamping space 221 is stable, ensuring a stable clamping effect on the battery 500 to be tested.

[0089] During specific implementation, the first direction is the vertical direction.

[0090] It can be understood that setting the first direction as the vertical direction can make the sliding directions of the stress rod 212 and the guiding column 211 in the corresponding crank-slider assembly 210 correspond to the gravity direction, facilitating the simulation of the conditions of the battery in different postures under the action of gravity, facilitating the test operation, and enabling the structural layout of the battery testing device to be more optimized, reducing the floor area.

[0091] Moreover, with such a setting, the guiding column 211 and the stress rod 212 of one of the crank-slider assemblies 210 can both slide in the vertical direction, and the guiding column 211 and the stress rod 212 of the other crank-slider assembly 210 can slide in the vertical direction and the horizontal direction simultaneously, ensuring the flexibility and convenience of the posture adjustment of the clamping space 221.

[0092] In some embodiments, referring to Figures 1 to 3 as shown, in the same crank-slider assembly 210, at least two sliders 2111, stress rods 212, and cranks 213 are correspondingly provided.

[0093] It can be understood that with such a setting, in each crank-slider assembly 210, at least two stress rods 212 and two cranks 213 are connected to the pressing plate 220, enabling the pressure applied by the pressing mechanism 300 to the pressing plate 220 to be more balanced, avoiding excessive local pressure on the battery 500 to be tested due to uneven force when balanced pressure needs to be applied to the battery 500 to be tested, and also enabling, in specific situations, the battery 500 to be tested to be pressurized and tested unilaterally through a single set of stress rods 212 and cranks 213, etc.

[0094] During specific implementation, the two sliders 2111 are arranged at intervals along the length extension direction of the guiding column 211, and the stress rods 212 and the cranks 213 are respectively arranged in one-to-one correspondence with the sliders 2111.

[0095] In some embodiments, referring to Figures 1 to 3 as shown, the pressing mechanism 300 includes at least one pressing member 310, and the pressing member 310 is correspondingly connected to the stress rod 212 and applies pressure to the stress rod 212.

[0096] It can be understood that the pressing member 310 can be a pneumatic piston cylinder, a hydraulic piston cylinder, a motor, or other devices that can output pressure linearly, and the present application does not limit this.

[0097] By providing at least one pressing member 310, the pressing member 310 applies pressure to the clamping space 221 along the extension direction of the stress rod 212, successively through the stress rod 212 and the pressing plate 220, making the pressure more stable and reliable.

[0098] Among them, only one pressing member 310 can be provided. The pressing member 310 is connected to each stress rod 212 in the same crank-slider assembly 210 through a pressure equalizing device to achieve synchronous pressing. Alternatively, the pressing members 310 can be connected to the corresponding stress rods 212 one by one. This application does not limit this.

[0099] Moreover, in some embodiments, the housing assembly 100 includes:

[0100] The upper housing 110;

[0101] The lower housing 120. A set of crank-slider assemblies 210 are respectively provided corresponding to the lower housing 120 and the upper housing 110;

[0102] The adjustable guide posts 130 are slidably connected to the upper housing 110 and the lower housing 120 to make the upper housing 110 and the lower housing 120 approach or move away from each other.

[0103] It can be understood that the first slide rail 111 and the second slide rail 121 are respectively provided on the upper housing 110 and the lower housing 120. The two sets of crank-slider assemblies 210 are respectively provided corresponding to the upper housing 110 and the lower housing 120 and are correspondingly connected to the first slide rail 111 and the second slide rail 121. When the upper housing 110 and the lower housing 120 approach or move away from each other under the action of the adjustable guide posts 130, the two sets of crank-slider assemblies 210 can be driven to move synchronously, realizing the increase and decrease of the clamping space 221.

[0104] Among them, multiple adjustable guide posts 130 are provided, and the multiple adjustable guide posts 130 are sequentially arranged at intervals between the upper housing 110 and the lower housing 120.

[0105] It can be understood that the multiple adjustable guide posts 130 are sequentially arranged at intervals, which can make the connection between the upper housing 110 and the lower housing 120 more stable and the relative approach or separation more smooth.

[0106] In addition, in some embodiments, the battery testing device provided by the embodiments of this application further includes a detection component 400. The detection component 400 is arranged on the clamping mechanism 200 to detect the pressure applied to the clamping space 221 and / or the relative displacement of the clamping space 221.

[0107] By setting the detection component 400, additional detection devices can be omitted, making the battery test more convenient and fast. Among them, the detection component 400 at least includes a pressure detection member 410 and a displacement detection member 420. The pressure detection member 410 is arranged between the stress rod 212 at the upper housing 110 and the pressing member 310 to detect the output pressure of the pressing member 310 and the pressure received by the pressing plate 220, so as to obtain the pressure borne by the battery under test 500. The displacement detection member 420 is arranged on the lower housing 120 and is located below the stress rod 212 at the lower housing 120, so that the displacement detection member 420 measures the displacement of the stress rod 212 and the pressing plate 220, thereby obtaining the expansion strain of the battery under test 500.

[0108] Moreover, the battery test device provided by the embodiment of the present application further includes a locking component, which is correspondingly arranged with the clamping mechanism 200 for locking the clamping space 221 in a preset pose or unlocking it.

[0109] It can be understood that when specifically testing the battery under test 500, sometimes it is necessary to fix the pose of the battery under test 500. Therefore, the locking component is set to lock components such as the guide post 211, the stress rod 212, the adjustable guide post 130, and the pressing plate 220 to meet the test requirements.

[0110] Specifically, the locking component can be an electromagnetic adsorption locking component or a mechanical locking component, and the present application does not limit this. Among them, the electromagnetic adsorption locking component can be selected to be opened or closed according to the test requirements, realizing stepless regulation of the full pose of the battery under test 500, and the pose of the battery under test 500 is accurate and stable.

[0111] Furthermore, the battery test device provided by the embodiment of the present application can also be connected to a computer communication module, so as to automatically control the gap of the pressing plate 220 and real-time feedback and regulate the battery pose during the test process.

[0112] Refer to Figures 1 to 4 As shown, the embodiment of the present application provides a battery test method, which is applied to the battery test device in the above embodiment. The battery test method includes:

[0113] S101. Place the battery under test 500 into the clamping space 221.

[0114] Among them, the battery under test 500 can be a power battery with a partially opened transparent observation window or a fully transparent power battery, which is convenient for directly observing the electrolyte breathing effect of the battery under test 500. The present application does not limit this.

[0115] Moreover, the power battery can specifically be common lithium batteries, nickel-metal batteries, lead-acid batteries, etc. on the market, or it can also be a soft-pack battery, a square aluminum-shell battery, etc. It can also be a specially designed window battery, transparent battery, half-cell, or even a single cell or multiple cells. This application does not limit this.

[0116] S102. Adjust the pose of the battery 500 to be measured through the clamping mechanism 200.

[0117] Among them, the pose of the pressing plate 220 can be adjusted by adjusting the position of the guiding column 211 relative to the housing assembly 100, the position of the stress rod 212 relative to the slider 2111 on the guiding column 211, etc., so as to realize the adjustment of the pose of the battery 500 to be measured.

[0118] S103. Adjust the gap between the clamping space 221 and the battery 500 to be measured by telescoping at least part of the housing assembly 100, and / or adjust the pressure received by the battery 500 to be measured through the pressing mechanism 300.

[0119] Among them, the telescoping of the housing assembly 100 can adjust the distance between the upper housing 110 and the lower housing 120 through the adjustable guiding column 130, drive the two crank-slider assemblies 210 to move, and realize the adjustment of the size of the clamping space 221; and the pressure received by the battery 500 to be measured can be adjusted by adjusting the output pressure of the pressing mechanism 300.

[0120] S104. Test the corresponding parameters of the battery 500 to be measured.

[0121] Among them, the test parameters of the battery 500 to be measured can include the expansion amount, expansion stress, etc. of the battery 500 in a changing pose.

[0122] Exemplarily, the battery test method can specifically include a battery test method with adjustable pose, a battery test method with adjustable pose and constant pre-tightening force, and a battery test method with adjustable pose and constant gap.

[0123] Among them, the battery test method with adjustable pose is used to observe the breathing effect of the electrolyte inside the battery. The specific operation is as follows: Place the battery 500 to be measured and the filler in the clamping space 221 for fixation; adjust the relative positions of the two guiding columns 211 and their sliders 2111 to realize the battery pose at a specific angle; connect the pressing member 310 to an external power source; adjust the output pressure of the pressing member 310, and adjust the adjustable guiding column 130 between the upper housing 110 and the lower housing 120, so that the battery 500 to be measured is pre-tightened with a certain initial force; connect the battery 500 to be measured to a charge and discharge test cabinet for testing; observe the breathing effect of the electrolyte inside the battery through an image acquisition device.

[0124] The pose adjustment method of this method is simple, the mechanism connection is simple, and the battery under test 500 is evenly and stably stressed. During the test, the electromagnetic adsorption locking component is used to lock between the guide columns 211. During the process of adjusting the pose of the battery under test 500, the electromagnetic is turned off, and the guide columns 211 can move freely in the first slide rail 111 or the second slide rail 121; after the pose adjustment of the battery under test 500 is completed, the electromagnetic is turned on, and the guide columns 211 are locked in specific positions of the first slide rail 111 or the second slide rail 121, realizing stepless adjustment of the battery pose.

[0125] A constant pre-tightening force battery test method with adjustable pose is used to observe the expansion amount and electrolyte breathing effect of the battery under test 500. The specific operation is as follows: Place the battery under test 500 and the filler in the clamping space 221 for fixation; Use the locking component to lock the relative positions of the two guide columns 211, adjust the angle of the pressure plate 220 to the preset angle, and use the locking component to lock the pose of the pressure plate 220, as well as lock the relative positions of the two stress rods 212 and the adjustable guide column 130; Connect the pressure applying member 310 to an external power source, and move the pressure plate 220 at the upper housing 110 towards the battery under test 500 by adjusting the pressure, so that the battery under test 500 is clamped in the clamping space 221 with a certain initial force until the pressure detection member 410 detects a preset pressure value; Connect the battery under test 500 to the charge and discharge test cabinet for testing, and monitor the expansion amount generated by the battery under test 500 during the test in real time through the displacement detection member 420, and observe the electrolyte breathing effect inside the battery through the image acquisition device.

[0126] During the test, the battery will generate continuous stress and strain changes due to the internal reaction process. The pressure applying member 310, the adjustable guide column 130, the crank-slider assembly 210, and the pressure plate 220 jointly play a role in stabilizing the voltage, so that the battery under test 500 can accurately maintain the pressure state during the test. When the volume of the battery increases and expands, the stress on the pressure plate 220 at the upper housing 110 increases, and feedback will be generated inside the pressure applying member 310 and the output pressure will be reduced, finally achieving the effect that the battery under test 500 is pressed to maintain a constant value; when the battery under test 500 shrinks or the expansion stress decreases, the opposite is true. This is convenient for studying the influence of decoupling the gravity and expansion force thresholds on the electrolyte breathing effect.

[0127] An adjustable pose constant gap test method is used to observe the swelling force of the battery under test 500. The specific operations are as follows: Place the battery under test 500 and the filler in the clamping space 221; Lock the relative positions of the two guide columns 211 through the locking assembly, adjust the angle of the pressing plate 220 to the preset angle, and use the locking assembly to lock the pose of the pressing plate 220, as well as lock the relative positions of the two stress rods 212 and the adjustable guide column 130; Adjust the gap between the upper housing 110 and the lower housing 120 through the adjustable guide column 130, and then adjust the gap between the two pressing plates 220 until the displacement signal displayed by the displacement detection member 420 corresponding to the stress rod 212 at the lower housing 120 is the constant gap required for the test; Unlock the locking assembly and lock the relative positions of the upper housing 110 and the lower housing 120; Connect the battery under test 500 to the charge and discharge test cabinet for testing, and monitor the swelling force generated by the battery during the test in real time through the configured pressure detection member 410 and observe the electrolyte breathing effect inside the battery through the image acquisition device.

[0128] Therefore, before the test starts, control the distance between the upper housing 110 and the lower housing 120 through the adjustable guide column 130, complete the pose control through the crank-slider assembly 210, so as to generate a relative displacement between the pressing plate 220 and the battery under test 500, and reserve a certain gap under the monitoring mode of the displacement detection member 420, so as to ensure that the gap between the pressing plate 220 and the battery under test 500 remains unchanged during the test.

[0129] In addition, the requirements for connecting the battery under test 500 to the charge and discharge test cabinet for testing are described as follows:

[0130] Exemplarily, under the conditions of a pose of 0 to 90° and 25 ± 1°C, the battery under test 500 can be subjected to charge and discharge tests at a rate of 1C. That is, discharge at a constant current of 0.5C to 2.5V and set aside; charge and discharge at a constant current of 1C to 4.2V and set aside; charge at a constant current of 1.0C to 2.5V and set aside; Repeat the above steps, which is a cycle at a rate of 1C. During the test, the pressure detection member 410 detects the pressure in real time, and the displacement detection member 420 synchronously detects the change in the swelling amount of the battery under test 500. Among them, the ratio of the swelling amount of the battery under test 500 to the initial thickness of the battery under test 500 multiplied by the percentage can be understood as the thickness change rate of the battery under test 500. And, by adjusting the pose of the battery under test 500, the battery under test 500 can be tested in a vertical state or a horizontal state.

[0131] In summary, the battery testing method provided by the embodiments of the present application is applied to a battery testing device. The battery testing device includes a housing assembly 100, a clamping mechanism 200, and a pressing mechanism 300. By providing a telescopic housing assembly 100 and arranging a clamping mechanism 200 with a clamping space 221 on the housing assembly 100, a battery under test 500 can be clamped through the clamping space 221. The clamping mechanism 200 itself can slide or rotate relative to the housing assembly 100, so that the clamping space 221 and the battery under test 500 can move or rotate accordingly, thereby adjusting the pose of the battery under test 500. Moreover, when part of the housing assembly 100 telescopes, the size of the clamping space 221 can also be adjusted by the telescoping of the housing assembly 100, thereby adjusting the gap parameter between the battery under test 500 and the clamping space 221. The pressing mechanism 300 is connected to the clamping mechanism 200 so that the pressing mechanism 300 can apply pressure to the clamping space 221 through the clamping mechanism 200, thereby applying a pre-tightening force to the battery under test 500. Thus, the battery testing device provided by the embodiments of the present application can simultaneously adjust the pose of the battery under test 500 through a single device and can also apply a pre-tightening force to the battery under test 500, so as to achieve multiple parameter tests without replacing the device, making the battery testing more convenient and fast.

[0132] It should be noted that references to "one embodiment", "an embodiment", "an exemplary embodiment", "some embodiments", etc. in the specification mean that the described embodiment may include a particular feature, structure, or characteristic, but not every embodiment necessarily includes that particular feature, structure, or characteristic. Moreover, such phrases do not necessarily refer to the same embodiment. Further, when combining a particular feature, structure, or characteristic with an embodiment, implementing such feature, structure, or characteristic in other embodiments, whether explicitly or implicitly described, is within the knowledge of those skilled in the art.

[0133] In general, terms should be understood at least in part in the context of their use. For example, at least in part depending on the context, the term "one or more" used herein can be used to describe any feature, structure, or characteristic in a singular sense or can be used to describe a combination of features, structures, or characteristics in a plural sense. Similarly, at least in part depending on the context, terms such as "a" or "the" can also be understood to convey a singular usage or a plural usage.

[0134] It should be readily understood that the terms "on", "above", and "over" in this application should be construed in the broadest possible manner so that "on" not only means "directly on something", but also includes the meaning of "on something" with intervening features or layers therebetween, and "above" or "over" not only includes the meaning of "above" or "over something", but may also include the meaning of "above" or "over something" with no intervening features or layers therebetween (i.e., directly on something).

[0135] In addition, for ease of description, spatial relative terms may be used in the text, such as "below", "beneath", "under", "above", "over", etc., to describe the relationship of one element or feature to another as shown in the figures. Spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation shown in the drawings. The device may have other orientations (rotated 90° or at other orientations), and the spatial relative descriptors used in the text may be interpreted accordingly as well.

[0136] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery testing device, characterized in that, Comprising: A housing assembly (100), at least part of the housing assembly (100) being telescopic; A clamping mechanism (200), the clamping mechanism (200) being slidably disposed within the housing assembly (100) and being rotatable relative to the housing assembly (100) in part, the clamping mechanism (200) having a clamping space (221) for clamping a battery under test (500); The clamping space (221) is configured to increase or decrease as the clamping mechanism (200) rotates or moves relative to the housing assembly (100), or as the housing assembly (100) telescopes; A pressing mechanism (300), the pressing mechanism (300) being connected to the clamping mechanism (200) to apply pressure to the clamping space (221) through the clamping mechanism (200).

2. The battery testing device according to claim 1, wherein The clamping mechanism (200) includes: Two crank-slider assemblies (210) disposed oppositely, both of the two crank-slider assemblies (210) being slidably connected to the housing assembly (100), and the sliding directions of the two crank-slider assemblies (210) being different, the pressing mechanism (300) being connected to at least one of the crank-slider assemblies (210); Two pressing plates (220) disposed in parallel, the pressing plates (220) being hinged to the corresponding crank-slider assemblies (210), and the clamping space (221) being formed between the two pressing plates (220).

3. The battery testing device according to claim 2, characterized in that, The crank-slider assembly (210) includes: A guide post (211), the guide post (211) being slidably connected to the housing assembly (100), and a slider (2111) being provided on the guide post (211); A stress rod (212), the stress rod (212) being slidably connected to the slider (2111) and being hinged to the pressing plate (220); A crank (213), the crank (213) being hinged to the slider (2111), and the crank (213) being inclined relative to the stress rod (212) and being hinged to the pressing plate (220); The stress rod (212) is configured to drive the pressing plate (220) to move by sliding with the guide post (211) relative to the housing assembly (100) through the slider (2111), and to slide relative to the slider (2111) itself to rotate the pressing plate (220).

4. The battery testing device according to claim 3, wherein, The length of the crank (213) is less than or equal to the length of the stress rod (212).

5. The battery testing device according to claim 3, characterized in that, In the two crank-slider assemblies (210), one of the guide posts (211) slides relative to the housing assembly (100) in a first direction; The other guide post (211) slides along an arc tangent to the first direction, or slides along a straight line intersecting the first direction obliquely.

6. The battery testing device according to claim 5, characterized in that, In the two crank-slider assemblies (210), the extending directions of the stress rods (212) are all consistent with the first direction, and each of the stress rods (212) slides relative to the slider (2111) in the first direction.

7. The battery testing device according to claim 5, wherein The first direction is the vertical direction.

8. The battery testing device according to claim 3, wherein In the same crank-slider assembly (210), at least two of the slider (2111), the stress rod (212), and the crank (213) are correspondingly provided.

9. The battery testing device according to any one of claims 3-8, characterized in that, The pressing mechanism (300) includes at least one pressing member (310), and the pressing member (310) is correspondingly connected to the stress rod (212) and applies pressure to the stress rod (212).

10. The battery testing device according to any one of claims 2-8, characterized in that, The housing assembly (100) includes: An upper housing (110); A lower housing (120), and a set of the crank-slider assemblies (210) are respectively and correspondingly provided on the lower housing (120) and the upper housing (110); Adjustable guide posts (130) are slidably connected to the upper housing (110) and the lower housing (120) to make the upper housing (110) and the lower housing (120) approach or separate from each other.

11. The battery testing device according to claim 10, characterized in that, A plurality of the adjustable guide posts (130) are provided, and the plurality of adjustable guide posts (130) are sequentially and spacedly arranged between the upper housing (110) and the lower housing (120).

12. The battery testing device according to any one of claims 1-8, characterized in that, It further includes a detection assembly (400), and the detection assembly (400) is arranged on the clamping mechanism (200) to detect the pressure applied to the clamping space (221) and / or the relative displacement of the clamping space (221).

13. The battery testing device according to any one of claims 1-8, characterized in that, It further includes a locking assembly, and the locking assembly is correspondingly arranged with the clamping mechanism (200) to lock the clamping space (221) in a preset pose or unlock it.

14. A battery testing method, applied to the battery testing device according to any one of claims 1-13, characterized in that, The battery testing method includes: Placing the battery under test (500) into the clamping space (221); Adjusting the pose of the battery under test (500) through the clamping mechanism (200); Adjusting the gap between the clamping space (221) and the battery under test (500) by telescoping at least a part of the housing assembly (100), and / or adjusting the pressure received by the battery under test (500) through the pressing mechanism (300); Testing the corresponding parameters of the battery under test (500).

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