Battery bending test system and battery bending test method

Abstract

The embodiments of the present application are about a battery bending test system and a battery bending test method. According to one embodiment, the battery bending test system includes a fixing device having a setting surface configured to hold a battery; an extrusion device configured to squeeze the battery to bend the battery; and a carrying device configured to carry the fixing device, and the carrying device has a reference surface for carrying the fixing device, and the setting surface and the reference surface form a first angle. The range of the first angle is The battery bending test system and the battery bending test method provided in the embodiments of the present application can accurately control the bending angle and bending morphology of the battery, and reasonably evaluate the safety performance of the battery when subjected to bending force, which meets the expectations of safety testing.

Description

Technical Field

[0001] Embodiments of the present application relate to the field of batteries, and in particular, to a battery bending test system and a battery bending test method. Background Art

[0002] Batteries have been widely used in various electronic products and electric vehicles. However, in the actual use of batteries, various situations may occur that cause the batteries to bend or fold. For example, when disassembling a device to replace a battery, because the battery is firmly attached to the battery compartment, it is necessary to forcefully pry the battery out. At this time, the battery is subjected to bending force. For another example, when the device to which the battery belongs is subjected to bending force, the battery inside the device is also affected and thus subjected to bending force. Such bending conditions may cause safety hazards to the battery.

[0003] Therefore, the industry needs a reasonable battery bending test system and battery bending test method to evaluate the safety risks that may be caused by battery bending conditions. Summary of the invention

[0004] One of the purposes of the embodiments of the present application is to provide a battery bending test system and a battery bending test method, which can simulate reasonable battery bending conditions, thereby achieving a reasonable evaluation of the safety performance of the battery when subjected to bending forces.

[0005] According to an embodiment of the present application, a battery bending test system is provided, comprising: a fixing device having a setting surface, configured to fix the battery; a pressing device, configured to press the battery to bend the battery; and a carrying device, configured to carry the fixing device, and the carrying device has a reference surface for carrying the fixing device, and the setting surface and the reference surface form a first angle The first angle The range is about

[0006] In some embodiments of the present application, the first angle It is about 30°, about 45° or about 60°.

[0007] In some embodiments of the present application, the pressing device includes a pressing head configured to press the battery along a direction perpendicular to the reference surface.

[0008] In some embodiments of the present application, the fixing device includes a first plate-shaped element and a second plate-shaped element parallel to the first plate-shaped element, for fixing a portion of the battery.

[0009] In some embodiments of the present application, the first plate-like element has the setting surface and a first side surface perpendicular to the setting surface, and when the pressing head is configured to just start pressing the battery, the pressing head and the first side surface have a distance D in a direction extending along the setting surface.

[0010] In some embodiments of the present application, the distance D is about 20 mm.

[0011] In some embodiments of the present application, the fixing device also includes: a third plate-shaped element, which is parallel to the first plate-shaped element, the second plate-shaped element is located between the first plate-shaped element and the third plate-shaped element, and a first rod-shaped element, which passes through the second plate-shaped element and is connected to the first plate-shaped element and the third plate-shaped element, and the second plate-shaped element can move between the first plate-shaped element and the third plate-shaped element along the first rod-shaped element.

[0012] In some embodiments of the present application, the fixing device also includes: a second rod-shaped element, which passes through the third plate-shaped element, the second rod-shaped element having a first end and a second end opposite to the first end; a fourth plate-shaped element, which is connected to the first end and to the second plate-shaped element; and a third rod-shaped element, which is connected to the second end, the third rod-shaped element being configured to rotate so that the second rod-shaped element drives the second plate element to move along the first rod-shaped element.

[0013] In some embodiments of the present application, the pressing device is configured to descend at a predetermined speed to contact the battery.

[0014] In some embodiments of the present application, the extrusion device further comprises a connecting element and an actuating element, wherein the connecting element is configured to be connected to the extrusion head, and the actuating element is configured to be connected to the connecting element and control the displacement and extrusion force of the extrusion head.

[0015] In some embodiments of the present application, the supporting device includes an angle adjustment element configured to be connected to the fixing device, and the angle adjustment element includes a supporting surface supporting the fixing device, and the supporting surface is parallel to a setting surface of the fixing device.

[0016] In some embodiments of the present application, the angle adjustment device is configured to be connected to the reference surface.

[0017] In some embodiments of the present application, the supporting device includes a base, and the base is connected to the angle adjustment element.

[0018] In some embodiments of the present application, a data acquisition device is also included, which is used to collect battery parameters of the battery to determine the safety performance of the battery.

[0019] According to another embodiment of the present application, a battery bending test method is provided, comprising: carrying a fixing device by a carrying device, the carrying device having a reference surface for carrying the fixing device; holding the battery by the fixing device, the fixing device having a setting surface configured to hold the battery, the setting surface and the reference surface forming a first angle The first angle The range is The battery is compressed by a compression device to bend the battery; and the battery is compressed to a set condition.

[0020] The battery bending test system and battery bending test method provided in the embodiments of the present application can accurately control the bending angle and bending morphology of the battery, reasonably evaluate the safety performance of the battery when subjected to bending force, and meet the expectations of safety testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The following will briefly describe the drawings necessary for describing the embodiments of the present application or the prior art to facilitate the description of the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, without the need for creative work, drawings of other embodiments can still be obtained based on the structures illustrated in these drawings.

[0022] Figure 1a A three-dimensional schematic diagram of a battery bending test system according to an embodiment of the present application is shown;

[0023] Figure 1b Shows Figure 1a A top view of a battery in the battery bending test system of the illustrated embodiment along the Z direction;

[0024] Figure 2 Shows Figure 1a A side view of a battery bending test system of the embodiment shown, which shows a state where the battery bending test system does not hold a battery;

[0025] Figure 3 Shows Figure 1a A side view of a battery bending test system of the embodiment shown, which shows the state of the battery bending test system holding a battery;

[0026] Figure 4 yes Figure 3 An enlarged schematic diagram of the AA portion of the battery bending test system of the embodiment shown;

[0027] Figure 5 Shows Figure 1a A three-dimensional schematic diagram of a fixture of a battery bending test system according to the embodiment shown;

[0028] Figure 6 A schematic diagram of a process of a battery bending test method according to an embodiment of the present application is shown;

[0029] Figure 7 A curve chart showing the change of parameters of battery 1 over time obtained by using a battery bending test method according to an embodiment of the present application;

[0030] Figure 8 A curve chart showing the variation of parameters of Battery II over time obtained using a battery bending test method according to an embodiment of the present application. DETAILED DESCRIPTION

[0031] The embodiments of the present application will be described in detail below. In the full text of the present application specification, the same or similar components and components with the same or similar functions are represented by similar reference numerals. The embodiments of the accompanying drawings described herein are illustrative, graphical, and are used to provide a basic understanding of the present application. The embodiments of the present application should not be construed as limiting the present application.

[0032] In this specification, unless otherwise specified or limited, relative terms such as:

[0033] "Central", "longitudinal", "lateral", "front", "rear", "right", "left", "inner", "outer", "lower", "higher", "horizontal", "vertical", "above", "below", "above", "below", "top", "bottom" and their derivatives (such as "horizontally", "downwardly", "upwardly", etc.) should be interpreted as referring to the directions described in the discussion or illustrated in the drawings. These relative terms are used for convenience of description only and do not require that the present application be constructed or operated in a specific orientation.

[0034] As used herein, the terms "about," "approximately," "substantially," "substantially," and "approximately" are used to describe and illustrate small variations. When used in conjunction with an event or circumstance, the terms may refer to instances where the event or circumstance occurred exactly as well as instances where the event or circumstance occurred very approximately. For example, when used in conjunction with a numerical value, the terms may refer to a range of variation less than or equal to ±10% of the numerical value, such as less than or equal to ±5%, less than or equal to ±4%, less than or equal to ±3%, less than or equal to ±2%, less than or equal to ±1%, less than or equal to ±0.5%, less than or equal to ±10%, less than or equal to ±20%, less than or equal to ±1 ...

[0035] For example, two values ​​may be considered "substantially" the same if the difference between the two values ​​is less than or equal to ±10% of the mean of the values ​​(e.g., less than or equal to ±5%, less than or equal to ±4%, less than or equal to ±3%, less than or equal to ±2%, less than or equal to ±1%, less than or equal to ±0.5%, less than or equal to ±0.1%, or less than or equal to ±0.05%).

[0036] Furthermore, for ease of description, “first”, “second”, “third”, etc. may be used herein to distinguish different components in one figure or a series of figures. “First”, “second”, “third”, etc. are not intended to describe the corresponding components.

[0037] In the present application, unless otherwise specified or limited, the terms "set", "connect", "couple", "fixed" and similar terms are used broadly, and those skilled in the art can understand that the above terms can be, for example, fixed connection, detachable connection or integrated connection according to the specific circumstances; it can also be a mechanical connection or an electrical connection; it can also be a direct connection or an indirect connection through an intermediate structure; it can also be an internal communication between two components.

[0038] In the detailed description and claims, a list of items connected by the terms "one of," "one of," "a kind of," or other similar terms may mean any of the listed items. For example, if items A and B are listed, the phrase "one of A and B" means only A or only B. In another example, if items A, B, and C are listed, the phrase "one of A, B, and C" means only A; only B; or only C. Item A may include a single element or multiple elements. Item B may include a single element or multiple elements. Item C may include a single element or multiple elements.

[0039] In the detailed description and claims, a list of items connected by the terms "at least one of," "at least one of," "at least one of," or other similar terms may mean any combination of the listed items. For example, if items A and B are listed, the phrase "at least one of A and B" means only A; only B; or A and B. In another example, if items A, B, and C are listed, the phrase "at least one of A, B, and C" means only A; or only B; only C; A and B (excluding C); A and C (excluding B); B and C (excluding A); or all of A, B, and C. Item A may include a single element or multiple elements. Item B may include a single element or multiple elements. Item C may include a single element or multiple elements.

[0040] The "General Technical Requirements for Lithium-ion Batteries for Wireless Headphones" proposes a method for bending batteries, which is required to be performed at a temperature of 20±5 degrees Celsius. The battery can be a rectangular parallelepiped having four sides along the length direction and four sides along the width direction, wherein the first side and the second side extend along the length direction, the third side and the fourth side extend along the width direction, and the third side and the fourth side are both located between the first side and the second side. First, fully charge the battery to be tested in accordance with the regulations of the battery manufacturer. Then, the battery is loosely held between the two clamps of the testing machine, one of which is movable for bending the battery. Next, the first side, the second side, the third side and the fourth side of the battery are reciprocated and bent 250 times at a frequency of 0.5Hz. The angle range of the battery that can be bent using this device is 45 degrees to 60 degrees.

[0041] However, in the actual use of batteries, it is not common for batteries to be subjected to high-frequency repeated bending. Therefore, this test method does not accurately and appropriately simulate the common working conditions when the battery is subjected to bending force, and cannot reasonably evaluate the safety performance in actual applications, which does not meet the expectations of safety testing.

[0042] The prior art also provides a method, which provides two horizontally placed metal blocks with Teflon tape, tightly wraps the battery with the Teflon tape, and then places the battery between the two metal blocks to ensure that the battery does not slide between the two metal blocks. Then, an extrusion head is used to vertically extrude the battery downward.

[0043] However, the applicant found that the battery cannot be firmly fixed by clamping the battery with a metal block with Teflon tape. In the actual test process, it is easy for the battery and the metal block to slip, which will cause the test to fail to proceed smoothly. In addition, the edge where the metal block contacts the battery is an edge, which easily applies shear force to the battery, which does not conform to the actual working condition of the battery. In addition, since the existing test method squeezes the battery downward in a direction perpendicular to the horizontal plane, it can only control the bending angle of the battery within a small range of about 45 degrees to 60 degrees. If you want to achieve a larger range of bending angles, such as a bending angle of about 0 degrees to 90 degrees, or about 0 degrees to 120, or about 0 degrees to 180 degrees, the existing test methods and systems are difficult to achieve. Furthermore, neither of the above two methods can achieve precise control of the bending angle and bending morphology of the battery.

[0044] In view of the above, the embodiments of the present application provide a novel battery bending test system and battery bending test method. Through the system and method provided in the embodiments of the present application, the battery can be bent to a predetermined angle, or subjected to a predetermined pressure, or a predetermined displacement can be achieved, thereby achieving precise control of the angle, displacement and pressure of the battery bending, and then performing a reasonable battery bending test to effectively and reasonably evaluate the safety performance of the battery. In addition, through the system provided in the embodiments of the present application, the battery can be securely fixed to prevent the battery from sliding between the fixture during the test, thereby improving the convenience and efficiency of the test. In addition, through the system provided in the embodiments of the present application, the range of battery bending can be not limited to about 45 degrees to 60 degrees, and can reach a range of about 0 degrees to 180 degrees.

[0045] FIG1 shows a three-dimensional schematic diagram of a battery bending test system 10 according to an embodiment of the present application. Figure 1b Shows Figure 1a The battery bending test system 10 of the illustrated embodiment is a top view of a battery along the Z direction. Figure 2 Shows Figure 1a The illustrated embodiment is a schematic side view of the battery bending test system 10 , which shows a state where the battery bending test system 10 does not hold a battery. Figure 3 Shows Figure 1a The battery bending test system 10 of the illustrated embodiment is a side view schematically showing the state of the battery bending test system 10 holding a battery. Figure 4 Shows Figure 3 The illustrated embodiment is an enlarged schematic diagram of the AA portion of the battery bending test system 10 . Figure 5 Shows Figure 1a The three-dimensional schematic diagram of the fixing device 100 of the battery bending test system 10 of the embodiment shown in FIG. Figures 1a to 5 As shown, a battery bending test system 10 according to an embodiment of the present application includes: a fixing device 100 , a pressing device 200 , a carrying device 300 , an angle adjustment element 400 and a battery 500 .

[0046] In one embodiment, the fixing device 100 may be configured to hold the battery 500. The fixing device 100 may include a first plate-shaped element 101, a second plate-shaped element 103, a third plate-shaped element 105, a first rod-shaped element 107, a second rod-shaped element 109, a fourth plate-shaped element 111, and a third rod-shaped element 113. The material of the first plate-shaped element 101, the second plate-shaped element 103, the third plate-shaped element 105, the first rod-shaped element 107, the second rod-shaped element 109, the fourth plate-shaped element 111, and the third rod-shaped element 113 may be a metal or non-metal material with suitable hardness.

[0047] In one embodiment, the first plate-shaped element 101 may be configured to be disposed on the reference surface 301 of the carrier 300 through the angle adjustment element 400. In other embodiments of the present application, the first plate-shaped element 101 may be configured to be disposed on the reference surface 301 of the carrier 300 in any suitable manner. The first plate-shaped element 101 includes a first surface 101a and a second surface 101b opposite to the first surface 101a, and a first side surface 101c perpendicular to the first surface 101a and the second surface 101b and located between the first surface 101a and the second surface 101b. The second surface 101b configured to hold the battery 500 may be referred to as a setting surface in the present application. The first surface 101a of the first plate-shaped element 101 is disposed on the angle adjustment element 400. The intersection of the second surface 101b and the first side surface 101c may be chamfered to prevent the intersection of the second surface 101b and the first side surface 101c from causing shear force to the battery 500 when the extrusion device 200 extrudes the battery 500. The first plate-shaped element 101 may be connected to the angle adjustment element 400 via a bolt 101d, and connected to the first rod-shaped element 107 via a bolt 101e. In other embodiments of the present application, the first plate-shaped element 101 may be configured to be connected to the angle adjustment element 400 and the first rod-shaped element 107 in any suitable manner.

[0048] In one embodiment, the battery 500 has a first portion 501 located on the second surface 101b of the first plate-like element 101, and a second portion 502 extending from the plane where the first side surface 101c is located along the extension direction of the setting surface, that is, the Y direction. The battery 500 has a first surface 500a and a second surface 500b opposite to the first surface 500a, and the first portion 501 and the second portion both have a first surface 500a and a second surface 500b. The fixing device 100 is configured to hold the first surface 500a and the second surface 500b of the first portion 501, and expose the first surface 500a and the second surface 500b of the second portion 502 of the battery 500, so that the extrusion device 200 can extrude the second portion 502 of the battery 500. See Figure 1b ,by Figure 1bThe left side of the dotted line M in the figure is the first part 501 clamped in the fixing device 100, and the right side of the dotted line M is the second part 502. When the battery 500 is fixed between the first plate-shaped element 101 and the second plate-shaped element 103, the first surface 500a of the battery 500 intersects the first side surface 101c perpendicularly, and the first surface 500a of the battery 500 is parallel to the first surface 101a and the second surface 101b of the first plate-shaped element 101. The second part 502 of the battery 500 passes through between the first plate-shaped element 101 and the second plate-shaped element 103, and extends a first distance L along the extension direction of the first surface 500a of the battery with the plane where the first side surface 101c is located as the starting point. The first distance L can be, for example, but not limited to, about 10mm, about 20mm, about 30mm, about 35mm, about 40mm or about 50mm. The value of the first distance L can be determined according to the specific model of the battery 500 or the actual situation. The battery 500 may be a substantially rectangular parallelepiped, and in a plane viewed from the Z direction, the battery 500 has a first side 500c and a second side 500d parallel to the first side 500c, and a third side 500e and a fourth side 500f perpendicularly intersecting the second side 500d and the first side 500c. The Z direction is perpendicular to the first surface 500a of the battery 500. The second portion 502 is a portion of a corner where the intersection of the third side 500e and the second side 500d is located. In other embodiments of the present application, the second portion 502 may be a portion of a corner where the intersection of any two of the first side 500c, the second side 500d, the third side 500e and the fourth side 500f is located. In other embodiments of the present application, the battery 500 may be of any shape, and the second portion 502 of the battery 500 may be any portion of the battery 500.

[0049] In one embodiment, the second plate-shaped element 103 is parallel to the first plate-shaped element 101. The second plate-shaped element 103 includes a third surface 103a and a fourth surface 103b opposite to the third surface 103a, and a second side surface 103c perpendicular to the third surface 103a and the fourth surface 103b and located between the third surface 103a and the fourth surface 103b. The third surface 103a configured to hold the battery 500 may be referred to as a setting surface in this application. The second plate-shaped element 103 includes a through hole 103e that passes through the second plate-shaped element 103. The through hole 103e can receive the first rod-shaped element 107 so that the second plate-shaped element 103 can move along the first rod-shaped element 107. In other embodiments of the present application, the second plate-shaped element 103 can be configured to receive the first rod-shaped element 107 in any suitable manner. The second plate-shaped element 103 can be moved along the first rod-shaped element 107 in a direction close to the first plate-shaped element 101 to hold the first portion 501 of the battery 500 between the first plate-shaped element 101 and the second plate-shaped element 103. Alternatively, the second plate-shaped element 103 can be moved in a direction away from the first rod-shaped element 107 to disengage the first portion 501 of the battery 500 held between the first plate-shaped element 101 and the second plate-shaped element 103 from the fixing device 100. When the battery 500 is held between the first plate-shaped element 101 and the second plate-shaped element 103, the first surface 500a of the battery 500 intersects the second side surface 103c of the second plate-shaped element 103 at right angles, and the first surface 500a of the battery 500 is parallel to the third surface 103a and the fourth surface 103b of the second plate-shaped element 103. The intersection of the third surface 103a of the second plate-shaped element 103 and the second side surface 103c may be chamfered to prevent shear force on the battery 500 when the extrusion device 200 extrudes the battery 500.

[0050] In one embodiment, the third plate-shaped element 105 is parallel to the first plate-shaped element 101 and the second plate-shaped element 103. The third plate-shaped element 105 includes a through hole 105a that passes through the third plate-shaped element 105. The through hole 105a can receive the second rod-shaped element 109 so that the second rod-shaped element 109 can drive the second plate-shaped element 103 to move along the first rod-shaped element 107. The third plate-shaped element 105 can be connected to the first rod-shaped element 107 via a bolt 105b.

[0051] In one embodiment, the first rod-shaped element 107 may be configured to penetrate the second plate-shaped element 103, connected to the first plate-shaped element 101 via bolts 101e, and connected to the third plate-shaped element 105 via bolts 105b. The first rod-shaped element 107 is fixed between the first plate-shaped element 101 and the second plate-shaped element 103.

[0052] In one embodiment, the second rod-shaped element 109 may be configured to penetrate the third plate-shaped element 105. The second rod-shaped element 109 has a first end 109a and a second end 109b opposite to the first end 109a. The first end 109a may be configured to be fixed in the fourth plate-shaped element 111. Since the fourth plate-shaped element 111 is connected to the second plate-shaped element 103 via a bolt 111a, the second rod-shaped element 109 fixed in the fourth plate-shaped element 111 can thereby drive the second plate-shaped element 103 to move. The second end 109b may be configured to be connected to the third rod-shaped element 113.

[0053] In one embodiment, the fourth plate-shaped element 111 may be configured to receive and fix the first end 109a of the second rod-shaped element 109, and may be connected to the second plate-shaped element 103 via a bolt 111a. In other embodiments of the present application, the fourth plate-shaped element 111 may fix the first end 109a and be connected to the second plate-shaped element 103 by any suitable means. When the second rod-shaped element 109 moves toward a direction close to the first plate-shaped element 101, the fourth plate-shaped element 111 moves along with the second rod-shaped element 109 toward a direction close to the first plate-shaped element 101, and thus pushes the second plate-shaped element 103 to move along the first rod-shaped element 107 toward a direction close to the first plate-shaped element 101. When the second rod-shaped element 109 moves toward a direction away from the first plate-shaped element 101, the fourth plate-shaped element 111 moves along with the second rod-shaped element 109 toward a direction away from the first plate-shaped element 101, and thus drives the second plate-shaped element 103 to move along the first rod-shaped element 107 toward a direction away from the first plate-shaped element 101.

[0054] In one embodiment, the third rod-shaped element 113 may be configured to be connected to the second end 109b of the second rod-shaped element 109. The third rod-shaped element 113 may be configured to rotate around the direction in which the second rod-shaped element 109 body extends, so that the second rod-shaped element 109 can move in the through hole 105a of the third plate-shaped element 105, so that the second rod-shaped element 109 can move toward a direction close to the first plate-shaped element 101, or move toward a direction away from the first plate-shaped element 101, so as to drive the second plate-shaped element 103 to move along the first rod-shaped element 107 toward a direction close to the first plate-shaped element 101 or move away from the first plate-shaped element 101.

[0055] In one embodiment, the pressing device 200 may be configured to press the first surface 500a of the second portion 502 of the battery 500 to bend the battery 500. The pressing device 200 includes an actuating element (not shown), a pressing head 201, and a connecting element 203.

[0056] In one embodiment, an actuating element (not shown) may be configured to be connected to the connecting element 203. The actuating element may control the displacement of the extrusion head 201 and the extrusion force applied to the battery 500. The actuating element may be configured to ensure that the extrusion head 201 squeezes the battery 500 to a set condition. The set condition may be that the bending battery 500 reaches a predetermined displacement, or the extrusion force of the battery 500 reaches a predetermined extrusion force, or the voltage drop of the battery 500 reaches a predetermined voltage drop. The predetermined displacement may be, for example, but not limited to, about 17.32 mm. The predetermined displacement may be the displacement of the battery 500 along the first direction X. The first direction X is perpendicular to and toward the reference surface 301. The predetermined extrusion force may be, for example, but not limited to, about 100 N. The predetermined voltage drop may be, for example, but not limited to, about 50 mv. The predetermined displacement, extrusion force and voltage drop may all be set according to the model of the battery 500 and actual needs. The actuating element may be configured to cause the extrusion head 201 to extrude the first surface 500a of the second portion 502 of the battery 500 at a speed of about 180 mm / min to 600 mm / min. When the displacement, extrusion force or voltage drop of the battery 500 is measured to reach a predetermined value, the actuating element may stop the extrusion head 201 from extruding. The actuating element may be configured to ensure that the tolerance of the displacement and extrusion force of the extrusion head 201 is ±1%. The actuating element may be connected to the connecting element 203 or directly to the extrusion head 201 in any suitable manner. The actuating element may be configured to squeeze the battery through the extrusion head 201 to bend to a predetermined angle, or to withstand a predetermined pressure, or to achieve a predetermined displacement, thereby achieving precise control of the angle, displacement and pressure of the bending of the battery 500, and then performing a reasonable battery bending test to effectively and reasonably evaluate the safety performance of the battery.

[0057] In one embodiment, the pressing head 201 may be configured to descend at a predetermined speed to contact the first surface 500a of the second portion 502 of the battery 500. The pressing head 201 may be configured to press the first surface 500a of the second portion 502 along a first direction X perpendicular to the reference surface 301 of the carrier 300 to bend the battery 500. In the direction extending along the first surface 500a of the battery 500, that is, Figure 3 and Figure 4In the Y direction shown in , when the extrusion head 201 descends to just start to squeeze the battery 500, there is a second distance D between the position of the extrusion head 201 just starting to squeeze the battery 500 and the first side surface 101c to prevent the extrusion head 201 from contacting the fixing device 100 when the battery 500 is subsequently squeezed. The second distance D can be, for example, but not limited to, about 10 mm, about 15 mm, about 20 mm. Since when the extrusion head 201 squeezes the battery 500, the extrusion head 201 will move on the surface 500b of the battery 500 toward the direction close to the first side surface 101c. Therefore, a minimum distance D is reserved to reserve space for the movement of the extrusion head 201 to prevent the extrusion head 201 from touching the fixing device 100. The value of the minimum distance D can be determined according to the specific model of the battery 500 or actual needs.

[0058] In one embodiment, the material of the pressing head 201 may be S136. The material of the pressing head 201 may be any material having a suitable hardness to press the battery 500.

[0059] In one embodiment, the connecting element 203 may be configured to be connected to the extrusion head 201. The connecting element 203 may be a connecting shaft. The material of the connecting element 203 may be S136. The diameter of the connecting element 203 may be, for example, but not limited to, about 30 mm, about 40 mm, or about 50 mm. The material of the connecting element 203 may have a suitable hardness to connect the extrusion head 201 with the actuating element. A pin 203a may be provided on the connecting element 203. The extrusion head 201 may be connected to the connecting element 203 via the pin 203a. In other embodiments of the present application, the connecting element 203 may be a connecting element of any suitable shape and material.

[0060] In one embodiment, the carrier 300 may be configured to carry the fixture 100. The carrier 300 has a reference surface 301 for carrying the angle adjustment element 400. The fixture 100 is disposed on the reference surface 301 of the carrier 300 through the angle adjustment element 400, so that the first surface 101a and the second surface 101b of the first plate-shaped element 101 of the fixture 100 form a first angle with the reference surface 301. The first angle For example, but not limited to, about about or about The first angle It may be, for example, but not limited to, about 30°, about 45°, or about 60°.

[0061] In one embodiment, the carrying device 300 may include a base 301. The angle adjustment element 400 may be connected to the base 301 by screws 301a. The carrying device 300 may also include a fixed base 303 configured to be connected to the base 301. The base 301 may be connected to the fixed base 302 by screws 301b. In the embodiment of the present application, the base 301 and the fixed base 302 may be connected by any suitable method.

[0062] In one embodiment, the battery bending test system 10 may further include a test platform 600. The test platform 600 may be configured to carry a fixed base 303. The fixed base 303 may be connected to the test platform 600 by screws 303a and a fixing element 700. The fixing element 700 may be L-shaped, which may firmly connect the test platform 600 and the fixed base 303. In other embodiments of the present application, the fixing element 700 may be in any suitable shape to fix the fixed base 303 to the test platform 600. In an embodiment of the present application, the fixed base 303 and the test platform 600 may be connected in any suitable manner.

[0063] In one embodiment, the angle adjustment element 400 may be configured to be connected to the fixture 100. The angle adjustment element 400 includes a bearing surface 401 that bears the fixture 100. The first plate-shaped element 101 may be connected to the angle adjustment element 400 via a bolt 101d. The first surface 101a of the first plate-shaped element 101 is disposed on the bearing surface 401 and is parallel to the bearing surface 401. Therefore, the angle between the bearing surface 401 and the reference surface 301 is = equal to the first angle between the first surface 101a or the second surface 101b of the first plate-like element 101 and the reference surface 301 Therefore, different angles can be set The angle adjustment element 400 forms first angles of different degrees between the first surface 101a and the second surface 101b of the first plate-like element 101 and the reference surface 301 of the carrying device 300. The extrusion device 200 can bend the battery 500 at a convenient and appropriate angle, and the battery 500 can be bent at any appropriate angle θ, and the range of θ can be, for example, but not limited to, about 0°≤θ≤180°, about 0°≤θ≤120°, about about about

[0064] In some embodiments of the present application, the battery bending test system 10 also includes a data acquisition device (not shown in the figure). The data acquisition device is used to collect battery parameters of the battery 500 to determine the safety performance of the battery. Battery parameters include various parameters that can indicate the safety performance of the battery 500, such as, but not limited to, temperature, voltage, displacement, and the extrusion force exerted on the battery 500. If the battery 500 catches fire or explodes after testing, the temperature of the battery 500 will rise rapidly to a higher temperature and the voltage will drop to about 0V. If the battery 500 does not catch fire or explode after testing, the temperature and voltage of the battery 500 will not change significantly.

[0065] The battery bending test system 10 provided in the embodiment of the present application can firmly hold the battery 500 between the first plate-shaped element 101 and the second plate-shaped element 103 to prevent the battery 500 from moving during the test. In addition, the first plate-shaped element 101 and the second plate-shaped element 103 will not cause shear force to the battery 500. In addition, by setting the angle adjustment element 400, the second surface 101b of the first plate-shaped element 101 of the fixture 100 holding the battery 500 is formed at a first angle with the reference surface 301. Thus, the squeezing device 200 can conveniently squeeze the battery 500 to bend the battery 500 to any desired angle θ, and the angle θ is not limited to the bending angle of only about 45 degrees to 60 degrees in the prior art, and can reach a range of about 0 degrees to 180 degrees. Therefore, the battery bending test system 10 provided in the embodiment of the present application can accurately and appropriately simulate the common working conditions when the battery is subjected to bending force, which meets the expectations of safety testing.

[0066] Figure 6 A schematic diagram of a battery bending test method 60 according to an embodiment of the present application is shown, which uses the battery bending test method shown in FIG. 1 to FIG. Figure 5 The illustrated embodiment provides a battery bending test system 100 .

[0067] according to Figure 6 In the illustrated embodiment, in step 601 , a battery bending test system 100 is provided, and a fixture 100 is carried by a carrying device 300 , wherein the carrying device 300 has a reference surface 301 for carrying the fixture 100 .

[0068] Next, in step 602, the battery 500 is fixed by the fixing device 100 of the battery bending test system 100. Specifically, the battery 500 is placed on the second surface 101b of the first plate-shaped element 101. Then, the third rod-shaped element 113 can be rotated to drive the second plate-shaped element 103 to move along the first rod-shaped element 107 toward the direction close to the first plate-shaped element 101, so as to fix the first part 501 of the battery 500 between the third surface 103a of the second plate-shaped element 103 and the second surface 101b of the first plate-shaped element 101, that is, the battery 500 is fixed between the setting surface 101b (second surface 101b) and the setting surface 103a (third surface 103a), and the second part 502 of the battery 500 is passed from between the first plate-shaped element 101 and the second plate-shaped element 103, so as to exceed the first side surface 101c of the battery 500 by a first distance L along the extension direction of the first surface 500a of the battery 500. The first distance L may be, for example, but not limited to, about 10 mm, about 20 mm, about 30 mm, about 35 mm, about 40 mm, or about 50 mm. The value of the first distance L may be determined according to the specific model of the battery 500 or the actual situation. The setting surface 101b (second surface 101b) or the setting surface 103a (third surface 103a) of the fixing device 100 forms a first angle with the reference surface 301. First Angle The range is

[0069] In one embodiment, the relevant parameters of the battery 500 are obtained by a data acquisition device. The relevant parameters of the battery 500 include, for example, but not limited to, the temperature, voltage and / or the extrusion force of the battery 500. In some embodiments of the present application, any suitable parameters related to the battery 500 may also be obtained.

[0070] In step 603, the first surface 500a of the second portion 502 of the battery 500 is pressed by the pressing head 201 of the pressing device 200 to bend the battery 500. The pressing head 201 may be pressed along a first direction X perpendicular to the reference surface 301 to bend the battery 500. In one embodiment, the pressing head 201 is configured to descend at a predetermined speed by the actuating assembly of the pressing device 200 so that the pressing head 201 contacts the first surface 500a of the second portion 502 of the battery 500. The predetermined speed may range from about 0.1 mm / min to 900 mm / min. The range of the predetermined speed may be determined according to actual needs. The pressing head 201 may be configured to descend at a constant predetermined speed. In some embodiments of the present application, the pressing head 201 may be configured to descend at a non-constant predetermined speed. When the pressing head 201 descends to start pressing the battery 500 , the minimum distance D between the position where the pressing head 201 starts pressing the battery 500 and the first side surface 101 c may be, for example, but not limited to, about 10 mm.

[0071] In step 604, the second part 502 of the battery 500 is squeezed to a set condition. The set condition may be that the bending battery 500 reaches a predetermined displacement, or the squeezing force of squeezing the battery 500 reaches a predetermined squeezing force, or the voltage drop of the battery 500 reaches a predetermined voltage drop. The predetermined displacement may be, for example, but not limited to, about 17.32 mm. The predetermined squeezing force may be, for example, but not limited to, about 100 N. The predetermined voltage drop may be, for example, but not limited to, about 50 mv. The predetermined displacement, squeezing force and voltage drop may all be set according to the model of the battery 500 and actual needs. The squeezing device 200 may be configured to squeeze the first surface 500a of the second part 502 at a speed of about 180 mm / min to 600 mm / min. When the displacement, squeezing force or voltage drop of the battery 500 is measured to reach a predetermined value, the squeezing device 200 stops squeezing. If the battery 500 does not catch fire or explode when the set condition is reached, the battery can be determined to be qualified. Otherwise, if the battery 500 catches fire or explodes, the battery may be determined to be unqualified.

[0072] Then, the third rod-shaped element 113 can be rotated in the opposite direction, so that the third rod-shaped element 113 drives the second plate-shaped element 103 to move along the first rod-shaped element 107 in a direction away from the first plate-shaped element 101, thereby taking out the battery 500 held between the first plate-shaped element 101 and the second plate-shaped element 103.

[0073] Therefore, the battery bending test method 60 provided in the embodiment of the present application can simulate the common bending conditions of the battery 500 during the terminal use process to perform a bending test on the battery 500. Moreover, during the test process, relative movement between the battery 500 and the fixing device 100 can be avoided, ensuring that the battery bending test is carried out effectively and smoothly. At the same time, by setting the first surface 101a of the first plate-shaped element of the fixing device 100 to have a first angle with the reference surface 301, The extrusion device 200 can be made to more conveniently squeeze the battery 500 to any desired angle. Moreover, different setting conditions can be set according to the specific models and actual requirements of different batteries 500, so as to more flexibly perform reasonable bending tests on various types of batteries. In addition, the battery bending test method 60 provided in the embodiment of the present application can accurately control the battery bending angle and bending morphology, so that the safety performance of different types of batteries when subjected to bending force can be more reasonably evaluated, which meets the expectations of safety testing.

[0074] Figure 7 A curve chart showing the variation of parameters of battery I over time obtained using a battery bending test method according to an embodiment of the present application. Figure 8 A curve chart showing the variation of parameters of battery I over time obtained using a battery bending test method according to an embodiment of the present application.

[0075] A battery I and a battery II of the same model with a width of about 26 mm and a thickness of about 40 mm are provided, and the initial voltage of the battery I and the battery II is measured to be about 4.3 V. The battery I and the battery II are fixed in the fixture 100. The second portion 502 of the battery I and the battery II is along the extension direction of the first surface 500a of the battery I and the battery II, that is, the first distance L beyond the first side surface 101c of the fixture where the battery I and the battery II are located is about 20 mm.

[0076] The pressing device 200 is lowered at a predetermined constant speed of about 20 mm / min so that the pressing head 201 contacts the first surface 500a of the second portion 502 of the battery I and the battery II. When the pressing head 201 is lowered to just contact the first surface 500a of the second portion 502 of the battery I and the battery II, the minimum distance D along the Y direction between the position where the pressing head 201 just contacts the battery I and the battery I and the first side surface 101c of the device where the battery I and the battery I are located is about 10 mm.

[0077] Next, the pressing head 201 was made to press the battery I and the battery II at a speed of 6 mm / min to a predetermined displacement of about 17.5 mm.

[0078] The displacement and voltage of battery I and battery II during the test are collected by a data acquisition device.

[0079] exist Figure 7 In FIG. 1 , the curve of the displacement of battery I over time is marked as curve I, and the curve of the voltage of battery I over time is marked as curve II. Figure 7 It can be seen that when the displacement of battery 1 reaches about 17.5 mm, the initial voltage of battery 1 drops rapidly from about 4.3 V to about 0 V. Battery 1 has caught fire at this time, so it is determined that battery 1 is unqualified and is a defective battery.

[0080] exist Figure 8 In the figure, the curve of the displacement of battery II changing with time is marked as curve I, and the curve of the voltage of battery II changing with time is marked as curve II. Figure 8 It can be seen that when the displacement of battery II reaches about 17.5 mm, the voltage of battery II does not change substantially. Therefore, it can be determined that battery II is qualified and is a normal battery.

[0081] Compared with the battery bending test method proposed in the "General Technical Requirements for Lithium-ion Batteries for Wireless Headphones", the battery testing method provided in this application can set test conditions that meet actual working conditions according to the characteristics of the battery itself to perform reasonable bending tests on the battery. It can accurately control the bending angle and bending morphology of the battery, and achieve more reasonable identification of internal defects and risks of the battery, which meets the expectations of safety testing and has a wide range of applications.

[0082] The technical content and technical features of this application have been disclosed as above, but those skilled in the art may still make various substitutions and modifications based on the teachings and disclosures of this application without departing from the spirit of this application. Therefore, the protection scope of this application should not be limited to the contents disclosed in the embodiments, but should include various substitutions and modifications without departing from this application, and be covered by the claims of this application.

Claims

1. A battery bending test system, comprising: A fixing device having a setting surface and configured to fix the battery, wherein the fixing device comprises a first plate-shaped element and a second plate-shaped element parallel to the first plate-shaped element and used to fix a portion of the battery; a pressing device configured to press the battery to bend the battery; and A carrying device is configured to carry the fixing device, and the carrying device has a reference surface for carrying the fixing device, and the setting surface and the reference surface form a first angle The first angle The range is The pressing device comprises a pressing head, and the pressing head is configured to press the battery along a direction perpendicular to the reference surface.

2. The battery bending test system according to claim 1, wherein the first angle 30°, 45° or 60°.

3. A battery bending test system according to claim 1, wherein the first plate-like element has the setting surface and a first side surface perpendicular to the setting surface, and when the extrusion head is configured to just start to squeeze the battery, the extrusion head and the first side surface have a distance D in a direction extending along the setting surface. The battery bending test system according to claim 3 , wherein the distance D is 20 mm.

5. The battery bending test system according to claim 1, wherein the fixture further comprises: a third plate-shaped element parallel to the first plate-shaped element, the second plate-shaped element being located between the first plate-shaped element and the third plate-shaped element, and A first rod-shaped element penetrates through the second plate-shaped element and is connected to the first plate-shaped element and the third plate-shaped element, and the second plate-shaped element is movable along the first rod-shaped element between the first plate-shaped element and the third plate-shaped element.

6. The battery bending test system according to claim 5, wherein the fixture further comprises: a second rod-shaped element, which penetrates through the third plate-shaped element, the second rod-shaped element having a first end and a second end opposite to the first end; a fourth plate-like element connected to the first end and to the second plate-like element; and A third rod-shaped element is connected to the second end portion, and the third rod-shaped element is configured to rotate so that the second rod-shaped element drives the second plate-shaped element to move along the first rod-shaped element.

7. A battery bending test system according to claim 1, wherein the supporting device includes an angle adjustment element, the angle adjustment element is connected to the fixing device, the angle adjustment element includes a supporting surface supporting the fixing device, and the supporting surface is parallel to the setting surface of the fixing device.

8. The battery bending test system according to claim 1, further comprising a data acquisition device for acquiring battery parameters of the battery to determine the safety performance of the battery.

9. A battery bending test method performed by the battery bending test system according to claim 1, comprising: Carrying a fixing device by a carrying device, wherein the carrying device has a reference surface for carrying the fixing device; The battery is held by the fixing device, wherein the fixing device has a setting surface configured to hold the battery, and a first angle is formed between the setting surface and the reference surface The first angle The range is squeezing the battery by a squeezing device to bend the battery; and The cell was squeezed to a set condition.

10. The battery bending test method according to claim 9, wherein the set condition is to bend the battery to achieve a predetermined displacement, or the set condition is to bend the battery to achieve a predetermined extrusion force, or the set condition is to bend the battery so that the battery achieves a predetermined voltage drop. 11 . The battery bending test method according to claim 10 , wherein the predetermined displacement is 17.32 mm, the predetermined extrusion force is 100 N, and the predetermined voltage drop is 50 mv.

12. The battery bending test method according to claim 9, wherein the first angle 30°, 45° or 60°.

13. The battery bending test method according to claim 9, wherein squeezing the battery by a squeezing device to bend the battery comprises: lowering the pressing device at a predetermined speed to contact the battery; and The pressing device is caused to press the battery in a direction perpendicular to the reference surface. 14 . The battery bending test method according to claim 13 , wherein the predetermined speed ranges from 0.1 mm / min to 900 mm / min. 15 . The battery bending test method according to claim 13 , wherein the pressing device presses the battery at a speed of 180 mm / min to 600 mm / min.

16. The battery bending test method according to claim 13, wherein holding the battery by the fixing device comprises: A first portion of the battery is held between a first plate-like element and a second plate-like element of the fixture, the first plate-like element being parallel to the second plate-like element.

17. The battery bending test method according to claim 16, wherein the first plate-shaped element has the setting surface and a first side surface perpendicular to the setting surface, and the fixing device holding the battery further comprises: The second portion of the battery is passed through between the first plate-shaped element and the second plate-shaped element, and is extended by a first distance along the extension direction of the setting surface starting from the plane where the first side surface is located.

18. The battery bending test method according to claim 17, wherein causing the pressing device to press the battery in a direction perpendicular to the reference surface comprises: When the pressing head of the pressing device is configured to just start pressing the battery, the pressing head is spaced a distance D from the first side surface in a direction extending along the setting surface so that the pressing head does not contact the fixing device during a subsequent pressing process.

19. The battery bending test method according to claim 9, further comprising collecting battery parameters of the battery through a data acquisition device, wherein the battery parameters include displacement, voltage and extrusion force exerted on the battery.

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