Battery measuring device

Abstract

The utility model relates to a battery measuring device, and the device comprises a first plate body which is used for bearing a battery; the second plate body and the first plate body are oppositely arranged in a spaced mode in the first direction, and the second plate body can move up and down in the first direction; the plurality of first sensing units are arranged on the bottom surface, facing the first plate body, of the pressing surface, and the ends, deviating from the second plate body, of all the first sensing units jointly form a pressing surface which is used for abutting against the battery when the second plate body moves downwards; and the at least one second sensing unit is arranged on the bottom surface, facing the first plate body, of the pressing surface, and one end, deviating from the second plate body, of the second sensing unit protrudes out of the pressing surface. The battery measuring device provided by the embodiment of the utility model can quantitatively research the distribution information of the large-area expansion force in the battery circulation process.

Description

Technical Field

[0001] This application relates to battery manufacturing technology, and in particular to a battery measuring device. Background Technology

[0002] Currently, judging from market trends, battery applications are becoming increasingly widespread. Batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. With the continuous expansion of battery applications, market demand is also constantly increasing.

[0003] In related technologies, as batteries undergo continuous charge-discharge cycles, ions are inserted into or extracted from the positive and negative electrode active materials, resulting in internal chemical reactions and battery expansion. In battery testing, the expansion force during charge-discharge is a crucial indicator; however, current measuring devices often cannot quantitatively study the distribution of large-area expansion force during battery cycling, thus failing to meet usage requirements. Utility Model Content

[0004] Therefore, it is necessary to provide a battery measurement device to address the problem that measurement devices cannot quantitatively study the distribution information of large-area expansion forces during battery cycling.

[0005] A first aspect of this application provides a measuring device, comprising: a first plate for supporting a battery; a second plate spaced apart from the first plate along a first direction, the second plate being movable up and down along the first direction; a plurality of first sensing units disposed on the bottom surface of the pressing surface facing the first plate, the ends of all the first sensing units facing away from the second plate forming a pressing surface for contacting the battery when the second plate moves downward; and at least one second sensing unit disposed on the bottom surface of the pressing surface facing the first plate, the end of the second sensing unit facing away from the second plate protruding from the pressing surface. By disposing at least one second sensing unit and a plurality of first sensing units on the bottom surface of the second plate facing the first plate, and the ends of all the first sensing units facing away from the second plate forming a pressing surface for contacting the battery, the pressing surface can press against the large surface of the battery to be measured, thereby detecting the distribution of expansion force on the large surface of the battery to be measured.

[0006] In one embodiment, projecting along the first direction, all the first and second sensing units are arranged in a matrix on the surface of the second plate. Thus, the first and second sensing units form a regularly distributed grid layout on the surface of the second plate, ensuring that the first and second sensing units uniformly cover the large rectangular surface of the battery, avoiding measurement blind spots, and thereby enabling comprehensive and synchronous acquisition of the expansion force distribution of the large surface of the battery to be measured.

[0007] In one embodiment, the second sensing unit is arranged at the corner of the matrix; and / or, the second sensing unit is arranged in the central region of the matrix. This allows for the simulation of stress concentration on the battery under various harsh environments. The second sensing unit and the first sensing unit work together to study the battery's cycle performance under these conditions, enabling the measuring device to quantitatively study the distribution of large-area expansion forces during battery cycling, ultimately providing detailed detection data for battery optimization and improvement.

[0008] In one embodiment, the height difference between the second sensing unit and the pressure-bearing surface is A, satisfying 0.5mm ≤ A ≤ 5mm. This facilitates creating a localized stress concentration state on the large surface of the battery to be measured and obtaining the pressure distribution on that surface.

[0009] In one embodiment, the end of the second sensing unit facing away from the second plate is spherical, cylindrical, or conical. This facilitates the creation of a localized stress concentration state on the large surface of the battery to be measured, and allows for the acquisition of the pressure distribution on that surface.

[0010] In one embodiment, the measuring device includes a fixing member that passes through the top surface of the second plate, facing away from the first plate, and is mounted on the second plate. Both the first and second sensing units are detachably fixed to the second plate via the fixing member. This installation method, with the fixing member facing away from the first plate, facilitates quick disassembly and replacement of the sensing units. Furthermore, the rear-mounted installation method does not affect other sensing units, avoiding interference and impacts. This significantly improves the flexibility and maintainability of the measuring device without damaging the second plate or other sensing units.

[0011] In one embodiment, the fastener is a screw; a fixing hole adapted to the fastener is formed on the surface of the second plate.

[0012] In one embodiment, each of the first sensing units includes a first acquisition part, a first connecting post, and a first base. The first base is connected to the second plate, and the two ends of the first connecting post are respectively connected to the first acquisition part and the first base. All the first acquisition parts together constitute the pressure surface. The second sensing unit includes a second acquisition part, a second connecting post, and a second base. The second base is connected to the second plate, and the two ends of the second connecting post are respectively connected to the second acquisition part and the second base. The second acquisition part protrudes from the pressure surface.

[0013] In one embodiment, when projected along the first direction, the first base completely covers the first acquisition unit, and the second base completely covers the second acquisition unit.

[0014] In one embodiment, projected along the first direction, the first base is a square structure and the first acquisition unit is a square structure; the side length of the first base is B1, 20.5mm≤B1≤22.8mm; the side length of the first acquisition unit is B2, 19mm≤B2≤22.5mm.

[0015] In one embodiment, the gap between two adjacent first acquisition units is C, where 0mm ≤ C ≤ 1mm. By controlling the gap between two adjacent first acquisition units, it can be ensured that the first base of the first sensing unit and the second base of the second sensing unit are closely arranged without causing interference between the first acquisition units or between the first and second acquisition units; at the same time, it can also avoid the inability to accurately obtain the pressure distribution of each area on the battery surface due to excessive gaps, thereby ensuring the measurement accuracy of the measuring device.

[0016] In one embodiment, the first sensing unit is a pressure sensor; and / or, the second sensing unit is a pressure sensor.

[0017] In one embodiment, the measuring device includes: a frame, a drive unit, and a connecting plate. The drive unit is fixed to the top side of the frame, and the first plate is disposed on the bottom side of the frame. The connecting plate is detachably connected to the second plate. The drive unit drives the second plate to move up and down along the first direction through the connecting plate.

[0018] In one embodiment, the second plate has positioning grooves formed on both sides along the second direction, and the connecting plate has hooks that mate with the positioning grooves on both sides along the second direction; the second direction intersects with the first direction. This ensures that the second plate and the connecting plate remain relatively fixed in the first direction.

[0019] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a measuring device provided in some embodiments of this application.

[0021] Figure 2 for Figure 1 Enlarged view of region D of the structure shown.

[0022] Figure 3 This is a schematic diagram of the structure of a first sensing unit provided in some embodiments of this application.

[0023] Figure 4 This is a schematic diagram of the structure of a second sensing unit provided in some embodiments of this application.

[0024] Figure 5 This is an assembly diagram of a first sensing unit, a second sensing unit, a fixing member, and a second plate provided in some embodiments of this application. The solid arrows in the diagram represent the installation direction of the fixing member.

[0025] Figure 6 This is an assembly diagram of the first sensing unit, the second sensing unit, and the second plate provided in some embodiments of this application.

[0026] Figure 7 This is a schematic diagram of the structure of a connecting plate provided in some embodiments of this application.

[0027] Figure 8 The diagram below shows the structure of the second plate provided in some embodiments of this application, wherein the fixing holes are omitted.

[0028] Figure 9 A flowchart illustrating a battery detection method provided in some embodiments of this application.

[0029] Explanation of reference numerals in the attached figures:

[0030] Battery-121, Charger-100;

[0031] First plate-10, second plate-20, first sensing unit-30, first acquisition unit-31, first connecting post-32, first base-33, second sensing unit-40, second acquisition unit-41, second connecting post-42, second base-43, fixing component-50, frame-60, driving component-70, connecting plate-80, first direction-X, second direction-Y. Detailed Implementation

[0032] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0034] In the description of the embodiments of this application, if the technical terms such as "first" and "second" appear, these terms are used only for descriptive purposes to distinguish different objects, and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0035] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0036] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0037] In the description of the embodiments of this application, if the term "multiple" appears, "multiple" means at least two (including two), such as two, three, etc., unless otherwise explicitly specified. Similarly, if the term "multiple sets" appears, "multiple sets" refers to two or more sets (including two sets), and if the term "multiple pieces" appears, "multiple pieces" refers to two or more pieces (including two pieces).

[0038] In the description of the embodiments of this application, if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0039] In the description of the embodiments of this application, unless otherwise explicitly specified and limited, the technical terms "installation," "connection," "joining," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0040] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0041] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0042] Currently, judging from market trends, battery applications are becoming increasingly widespread. Batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. With the continuous expansion of battery applications, market demand is also constantly increasing.

[0043] In related technologies, as batteries undergo continuous charge-discharge cycles, ions are inserted or extracted from the positive and negative electrode active materials, resulting in internal chemical reactions and battery expansion. In battery testing, the expansion force during charge-discharge is a crucial indicator. Measuring this expansion force through a measuring device can aid in battery design. However, existing devices for measuring battery expansion force use a matrix distribution of sensors, which are indistinguishable from one another. Therefore, this device can only measure the magnitude of the force or pressure across the entire cell surface and the distribution of expansion force at different locations on the cell surface. In practical applications, batteries are often more susceptible to localized stress, leading to some distortion in the results obtained using the aforementioned measuring devices regarding their impact on battery design. There is an urgent need for a measuring device suitable for studying the impact of localized stress concentration on cycle performance.

[0044] To address the issue that measuring devices cannot quantitatively study the distribution of large-area expansion forces during battery cycling, a second sensing unit can be designed to protrude beyond the other first sensing units. This creates a localized stress concentration state on the large surface of the battery to be measured, facilitating the acquisition of pressure distribution on that surface. This allows the measuring device to quantitatively study the distribution of large-area expansion forces during battery cycling, providing detailed testing data for battery optimization and improvement.

[0045] Figure 1 This is a schematic diagram of the structure of a measuring device provided in some embodiments of this application. Figure 2 for Figure 1 Enlarged view of region D of the structure shown. Figure 3 This is a schematic diagram of the structure of a first sensing unit provided in some embodiments of this application. Figure 4 This is a schematic diagram of the structure of a second sensing unit provided in some embodiments of this application. Figure 5 This is an assembly diagram of the first sensing unit, the second sensing unit, the fixing member, and the second plate provided in some embodiments of this application. Figure 6 for Figure 5 The bottom view of the assembly structure shown. Figure 7 This is a schematic diagram of the structure of a connecting plate provided in some embodiments of this application. Figure 8 This is a schematic diagram of the structure of the second plate provided in some embodiments of this application.

[0046] The first aspect of this application provides a battery measuring device for measuring the expansion force on the surface of a battery 121, particularly for measuring local stress on the surface of the battery 121.

[0047] See Figures 1 to 8 As shown, the measuring device includes: a first plate 10, a second plate 20, a plurality of first sensing units 30 and at least one second sensing unit 40.

[0048] The first plate 10 is used to support the battery 121. The second plate 20 is disposed at a distance from the first plate 10 along a first direction X, and the second plate 20 is movable up and down along the first direction X. A plurality of first sensing units 30 are disposed on the bottom surface of the second plate 20 facing the first plate 10, and the ends of all the first sensing units 30 opposite to the second plate 20 are collectively configured as a pressing surface for abutting against the battery 121 when the second plate 20 moves downward. The second sensing unit 40 is disposed on the bottom surface of the second plate 20 facing the first plate 10, and the end of the second sensing unit 40 opposite to the second plate 20 protrudes from the pressing surface.

[0049] The first plate 10 is used to support the battery 121. The first plate 10 can be a square plate or a circular plate, and the embodiments of this application are not limited in this regard. The material of the first plate 10 can be an alloy material such as aluminum alloy or stainless steel, and the surface is covered with an insulating layer; the material of the first plate 10 can also be a polymer material such as plastic or nylon, and the embodiments of this application are not limited in this regard either.

[0050] The second plate 20 and the first plate 10 are arranged at intervals relative to each other along the first direction X, and the constraint plate 20 and the first plate 10 form a space for accommodating the battery 121, which facilitates operation.

[0051] The second plate 20 can be a square plate or a circular plate, and the embodiments of this application are not limited in this regard. The material of the second plate 20 can also be a polymer material such as plastic or nylon, and the embodiments of this application are not limited in this regard either.

[0052] The first sensing unit 30 can be a thin-film sensor or a pressure sensor. The first sensing unit 30 can convert pressure into an electrical signal and transmit it outward, thereby obtaining the pressure distribution of the area on the surface of the battery 121 covered by the first sensing unit 30. Similarly, the second sensing unit 40 can be a pressure sensor, capable of converting pressure into an electrical signal and transmitting it outward, thereby obtaining the pressure distribution of the area on the surface of the battery 121 covered by the second sensing unit 40.

[0053] By setting at least one second sensing unit 40 and a plurality of first sensing units 30 on the bottom surface of the second plate 20 facing the first plate 10, the ends of all the first sensing units 30 away from the second plate 20 are collectively configured as a pressing surface that abuts against the battery 121; the pressing surface can press against the large surface of the battery 121 to be measured, thereby detecting the distribution of expansion force on the large surface of the battery 121 to be measured. Specifically, multiple first sensing units 30 and second sensing units 40 can be arranged in an array on the inner bottom surface of the second plate 20 facing the first plate 10. Each first sensing unit 30 and each second sensing unit 40 is an independent measurement area. By setting one end of the second sensing unit 40 away from the second plate 20 to protrude from the pressure surface, a local stress concentration state can be created on the large surface of the battery 121 to be measured, which facilitates the acquisition of the pressure distribution on the large surface to be measured. Finally, the cycle performance of the battery 121 under this state can be studied by the second sensing unit 40 and the first sensing unit 30. This allows the measuring device to quantitatively study the distribution information of the large surface expansion force of the battery 121 during cycling, providing detailed test data for the optimization and improvement of the battery 121.

[0054] It is understood that the battery 121 in the various embodiments of this application can be a single battery cell or a battery module composed of multiple battery cells.

[0055] In some possible embodiments, see Figures 1 to 8 As shown, the height difference between the second sensing unit 40 and the pressing surface is A, which satisfies 0.5mm≤A≤5mm.

[0056] Specifically, the height difference A between the second sensing unit 40 and the pressure surface can be 0.8mm to 2mm.

[0057] Thus, by setting the end of the second sensing unit 40 away from the second plate 20 to protrude 0.8mm~2mm from the pressure surface, it is convenient to create a local stress concentration state on the large surface of the battery 121 to be measured, and obtain the pressure distribution on the large surface to be measured. Then, the second sensing unit 40 and the first sensing unit 30 can jointly study the cycle performance of the battery 121 under this state, so that the measuring device can quantitatively study the distribution information of the large surface expansion force of the battery 121 during the cycle, and finally provide detailed test data for the optimization and improvement of the battery 121.

[0058] For example, the height difference A between the second sensing unit 40 and the pressing surface is 0.8mm, 1.0mm, 1.2mm, 1.45mm, 1.63mm, 1.82mm, or 2.0mm.

[0059] In some possible embodiments, see Figures 1 to 8As shown, the end of the second sensing unit 40 that is away from the second plate 20 is spherical, cylindrical or conical.

[0060] The end of the second sensing unit 40 facing away from the second plate 20 is also the first acquisition unit 31 (mentioned below). By setting the end of the second sensing unit 40 facing away from the second plate 20 to be spherical, cylindrical, or conical, it is convenient to create a local stress concentration state on the large surface of the battery 121 to be measured. Due to the spherical, cylindrical, or conical shape, the stress concentration of the battery 121 under various harsh environments can be simulated. Then, the cycle performance of the battery 121 under this state can be studied by the second sensing unit 40 and the first sensing unit 30. This allows the measuring device to quantitatively study the distribution information of the large surface expansion force of the battery 121 during the cycle, and finally provide detailed test data for the optimization and improvement of the battery 121.

[0061] In some possible embodiments, see Figures 1 to 8 As shown, when projected along the first direction X, all the first sensing units 30 and the second sensing units 40 are arranged in a matrix on the surface of the second plate 20.

[0062] Thus, the first sensing unit 30 and the second sensing unit 40 form a regularly distributed grid layout on the surface of the second plate 20, ensuring that the first sensing unit 30 and the second sensing unit 40 uniformly cover the rectangular surface of the battery 121, avoiding measurement blind spots, thereby enabling comprehensive and synchronous acquisition of the expansion force distribution of the large surface of the battery 121 to be measured; in addition, each first sensing unit 30 and each second sensing unit 40 is an independent measurement area, and the matrix arrangement allows the second sensing unit 40 to easily replace any of the first sensing units 30, thereby simulating the stress concentration of different areas of the battery 121 under various harsh environments.

[0063] In some other embodiments, all the first sensing units 30 and the second sensing units 40 may be arranged in a spiral, a ring or a straight line on the surface of the second plate 20, and the embodiments of this application do not limit this.

[0064] In some possible embodiments, the second sensing unit 40 may be arranged at the corners of the matrix to simulate stress concentration in the corner areas of the battery 121. In other possible embodiments, the second sensing unit 40 may be arranged in the central area of ​​the matrix to simulate stress concentration in the central area of ​​the battery 121.

[0065] Thus, by simulating the stress concentration of battery 121 under various harsh environments, the second sensing unit 40 and the first sensing unit 30 jointly study the cycle performance of battery 121 under this state, enabling the measuring device to quantitatively study the distribution information of large-area expansion force of battery 121 during cycling, and ultimately providing detailed test data for the optimization and improvement of battery 121.

[0066] In some possible embodiments, the number of second sensing units 40 in the measuring device is one, two, three, or four. The second sensing unit 40 can be disposed individually in the corner area of ​​the matrix, disposed individually in the middle area of ​​the matrix, or disposed simultaneously in both the corner area and the middle area of ​​the matrix.

[0067] In some possible embodiments, see Figures 1 to 8 As shown, the measuring device includes a fixing member 50, which passes through the second plate 20 from the top surface of the second plate 20 away from the first plate 10. The first sensing unit 30 and the second sensing unit 40 are both detachably fixed to the second plate 20 by the fixing member 50.

[0068] The fastener 50 may be a screw. A fixing hole 21 adapted to the fastener 50 is formed on the surface of the second plate 20. The fastener 50 passes through the fixing hole 21 and is threadedly connected to the end of the first sensing unit 30 and the second sensing unit 40 near the second plate 20.

[0069] In this embodiment, the sensor unit is installed from the top surface of the second plate 20 to the back of the first plate 10 using the fastener 50. This facilitates quick disassembly and replacement of the sensor unit, and the installation and fixing method from the back will not affect other sensor units, avoiding interference and collisions. This significantly improves the flexibility and maintainability of the measuring device without damaging the second plate 20 and other sensor units.

[0070] In this embodiment of the application, the sensing unit includes a first sensing unit 30 and a second sensing unit 40.

[0071] When it is necessary to simulate local stress concentration, it is only necessary to remove the fastener 50 at a specific location. The fastener 50 is removed from the top surface of the second plate 20 facing away from the first plate 10, without interfering with or colliding with other first sensing units 30 and second sensing units 40.

[0072] For example, the first sensing unit 30 at any position can be replaced with the second sensing unit 4. The first sensing unit 30 is removed by disassembling it from the top surface of the second plate 20 away from the first plate 10 using the fastener 50, and the second sensing unit 40 is installed on the bottom surface of the second plate 20. The fastener 50 passes through the top surface of the second plate 20 away from the first plate 10 and is screwed to the second sensing unit 40, thus completing the replacement of the first sensing unit 30 with the second sensing unit 40, simplifying the operation process and reducing maintenance costs.

[0073] In some possible embodiments, see Figures 1 to 8 As shown, each first sensing unit 30 includes a first acquisition part 31, a first connecting post 32 and a first base 33. The first base 33 is connected to the second plate 20. The two ends of the first connecting post 32 are respectively connected to the first acquisition part 31 and the first base 33. All the first acquisition parts 31 together constitute a pressing surface.

[0074] The first sensing unit 30 adopts a split structure. The first connecting post 32 and the first base 33 can both be made of high-strength metal materials, such as stainless steel or aluminum alloy; the independent assembly and disassembly of a single first sensing unit 30 can be achieved through the detachable connection between the first base 33 and the second plate 20.

[0075] All the first acquisition units 31 of the first sensing units 30 together form a pressure surface. The rigid structure of the first sensing unit 30 can accurately transmit the expansion force of the battery 121 to the first acquisition unit 31, and then transmit it to the outside through wires; avoiding signal attenuation and measurement deviation caused by the material deformation of the first connecting post 32 and the first base 33.

[0076] In some possible embodiments, see Figures 1 to 8 As shown, the second sensing unit 40 includes a second acquisition part 41, a second connecting post 42, and a second base 43. The second base 43 is connected to the second plate 20, and the two ends of the second connecting post 42 are respectively connected to the second acquisition part 41 and the second base 43. The second acquisition part 41 protrudes from the pressing surface.

[0077] Thus, the second sensing unit 40 adopts a split structure. The second connecting post 42 and the second base 43 can both be made of high-strength metal materials, such as stainless steel or aluminum alloy; through the detachable connection between the second base 43 and the second plate 20, the individual second sensing unit 40 can be independently assembled and disassembled.

[0078] The second acquisition unit 41 protrudes from the pressure surface, thereby creating a local stress concentration state on the large surface of the battery 121 to be measured. Then, the second sensing unit 40 and the first sensing unit 30 can jointly study the cycle performance of the battery 121 under this state, so that the measuring device can quantitatively study the distribution information of the large surface expansion force of the battery 121 during the cycle, and finally provide detailed test data for the optimization and improvement of the battery 121.

[0079] It is understood that the first collecting part 31 and the second collecting part 41 may have the same function, and their shapes may be the same or different. For example, the first collecting part 31 is plate-shaped, and the second collecting part 41 may be spherical, cylindrical or conical.

[0080] The first connecting post 32 and the second connecting post 42 usually have the same function, material and structure; however, the length of the second connecting post 42 can be greater than the length of the first connecting post 32, so that the second collecting part 41 can protrude from the pressing surface.

[0081] The functions, materials and structures of the first base 33 and the second base 43 are generally consistent, and this application does not limit them.

[0082] In some possible embodiments, see Figures 1 to 8 As shown, when projected along the first direction X, the first base 33 completely covers the first acquisition unit 31, and the second base 43 completely covers the second acquisition unit 41.

[0083] When all the first sensing units 30 and the second sensing units 40 are arranged in a matrix on the surface of the second plate 20, since the first base 33 completely covers the first acquisition part 31 and the second base 43 completely covers the second acquisition part 41, the first base 33 of the first sensing unit 30 and the second base 43 of the second sensing unit 40 can be arranged closely without causing interference between the first acquisition parts 31 and the second acquisition parts 41. This makes it convenient for operators to replace any one of the first sensing units 30 and the second sensing unit 40 as needed, thereby simulating stress concentration in different areas of the battery 121 under various harsh environments.

[0084] For example, when projected along the first direction X, the first base 33 is a square structure and the first acquisition unit 31 is a square structure; the side length of the first base 33 is B1, 20.5mm≤B1≤22.8mm; the side length of the first acquisition unit 31 is B2, 19mm≤B2≤22.5mm.

[0085] Specifically, the side length B1 of the first base 33 can be 20.5mm, 20.8mm, 21.2mm, 21.8mm, 22.1mm, or 22.8mm. The side length B2 of the first collecting part 31 can be 19mm, 19.5mm, 20.1mm, 20.5mm, 21.5mm, or 22.5mm.

[0086] Similarly, projecting along the first direction X, the second base 43 can be a square, and the second collecting part 41 can be the inscribed circle of the square; the side length of the second base 43 is B4, 20.5mm≤B1≤22.8mm; the diameter of the second collecting part 41 is B3, 19mm≤B4≤22.5mm.

[0087] Specifically, the side length B4 of the second base 43 can be 20.5mm, 20.8mm, 21.2mm, 21.8mm, 22.1mm, or 22.8mm. The side length B4 of the second collecting part 41 can be 19mm, 19.5mm, 20.1mm, 20.5mm, 21.5mm, or 22.5mm.

[0088] In some possible embodiments, see Figures 1 to 8 As shown, the gap between two adjacent first acquisition units 31 is C, where 0mm≤C≤1mm.

[0089] The collateral surface is projected along the first direction X, and the gap between two adjacent first acquisition units 31 is C, where 0mm ≤ C ≤ 1mm. In some embodiments, the gap C between two adjacent first acquisition units 31 can be 0.1mm to 0.8mm; the specific design shall prevail. By controlling the gap between two adjacent first acquisition units 31, it can be ensured that the first base 33 of the first sensing unit 30 and the second base 43 of the second sensing unit 40 are closely arranged without causing interference between the first acquisition units 31 and between the first acquisition units 31 and the second acquisition units 41; at the same time, it can also avoid the inability to accurately obtain the pressure distribution of each area on the surface of the battery 121 due to an excessively large gap C, thereby ensuring the measurement accuracy of the measuring device.

[0090] In some possible embodiments, see Figures 1 to 8 As shown, the measuring device includes: a frame 60, a drive unit 70, and a connecting plate 80. The drive unit 70 is fixed to the top side of the frame 60, and the first plate 10 is disposed on the bottom side of the frame 60. The connecting plate 80 is detachably connected to the second plate 20. The drive unit 70 drives the second plate 20 to move up and down along the first direction X through the connecting plate 80.

[0091] The frame 60 can be a frame structure supported by aluminum alloy or stainless steel, and the whole can be in the shape of a U. The frame 60 serves as the overall support frame, fixing the drive unit 70 to the top side, and the first plate 10 is set on the bottom side.

[0092] The drive component 70 can be a motor, a hydraulic cylinder, or a pneumatic cylinder. Taking a pneumatic cylinder as an example, the drive component 70 has a drive shaft (not shown) and a body (not shown). One end of the drive shaft can be connected to the connecting plate 80. The body is mounted on the frame 60. The drive shaft extends and retracts relative to the body, thereby driving the connecting plate 80, and thus driving...

[0093] The second plate 20 moves up and down along the first direction X.

[0094] Thus, by setting the drive component 70 and the frame 60, the second plate 20 can move up and down along the first direction X, thereby providing the required preset pressure. This allows the pressing surface to press against the large surface of the battery 121 to be measured under the preset pressure, thereby detecting the expansion force distribution of the large surface of the battery 121 to be measured, and providing detailed test data for the optimization and improvement of the battery 121.

[0095] In some possible embodiments, see Figures 1 to 8 As shown, the second plate 20 has positioning grooves 22 formed on both sides along the second direction Y, and the connecting plate 80 has hooks 81 that cooperate with the positioning grooves 22 on both sides along the second direction Y; the second direction Y is intersecting with the first direction X.

[0096] Specifically, the hook 81 can be L-shaped, and the two hooks 81 can be respectively embedded in the positioning groove 22, so that the second plate 20 and the connecting plate 80 remain relatively fixed in the first direction X. This ensures that the preset pressure of the driving member 70 can be transmitted to the second plate 20 through the connecting plate 80, and drives the second plate 20 to move up and down along the first direction X. This allows the pressing surface to press against the large surface of the battery 121 to be measured under the preset pressure, thereby detecting the expansion force distribution of the large surface of the battery 121 to be measured, and providing detailed test data for the optimization and improvement of the battery 121.

[0097] In other embodiments, the second plate 20 and the connecting plate 80 can be connected by connecting bolts and snap-fits, which is not limited in this application.

[0098] Figure 9 A flowchart illustrating a battery detection method provided in some embodiments of this application.

[0099] A second aspect of this application provides a battery detection method, which uses the above-described measuring device to measure the battery 121.

[0100] Battery testing methods include:

[0101] S10. Drive the second plate 20 downward along the first direction X, so that the first sensing unit 30 and the second sensing unit 40 mounted on the second plate 20 abut against the large surface of the battery 121. First, place the battery 121 on the first plate 10, and then apply pressure by the driving member 70. The driving member 70 drives the second plate 20 downward along the first direction X through the connecting plate 80 until the abutting surface slowly contacts the large surface of the battery 121 to be tested. Continue to apply pressure until a specified preset pressure is reached. The preset pressure value is equal to the sum of the pressure values ​​of all the first sensing units 30 and the second sensing units 40 obtained by the pressure acquisition software. Optionally, the preset pressure can typically be 1000N~3000N.

[0102] S20. Perform a charge / discharge test on battery 121. Specifically, connect the charge / discharge machine 100 to battery 121 and perform a charge / discharge test. The charge / discharge test conditions are: perform cyclic charge / discharge under a preset pressure of 2000N, a temperature of 25℃, and 1C cycle conditions, and collect expansion force distribution information in situ.

[0103] Thus, by jointly studying the cycle performance of battery 121 under this state through the second sensing unit 40 and the first sensing unit 30, the measuring device can quantitatively study the distribution information of large-area expansion force of battery 121 during cycling, and finally provide detailed test data for the optimization and improvement of battery 121.

[0104] Before placing the battery 121 on the first plate 10, multiple first sensing units 30 and at least one second sensing unit 40 can be mounted on the second plate 20. The required size of the first sensing units 30 and second sensing units 40 is selected based on the area requirement of the large surface of the battery 121 to be tested. Smaller sizes of the first sensing units 30 and second sensing units 40 are used when high data density is required, while larger sizes are used when low data density is required. The assembled second plate 20 should cover the large surface area of ​​the battery 121 to be tested.

[0105] To further illustrate the impact of stress concentration at different locations on cycle performance of the battery in this application, the following example data are provided.

[0106] Example 1:

[0107] According to the above battery detection method, the array panel composed of 8 first sensing units 30 and 1 second sensing unit 40 is as follows: Figure 5As shown, the second sensing unit 40 is 2mm above the collateral surface; it is cyclically charged and discharged under preset conditions of 2000N pressure, 25℃ temperature, and 1C cycle until the capacity of battery 121 drops.

[0108] It should be noted that the capacity drop of battery 121 refers to the phenomenon that the usable capacity of battery 121 suddenly and drastically decreases during cyclic charging and discharging under specific test conditions. This capacity decay does not occur slowly, but is a phenomenon of cell structure failure caused by local stress concentration. It is directly manifested as a significant drop in a short period of time (such as after a certain cycle), resembling a "diving" curve.

[0109] Result: After 96 cycles, the capacity of battery 121 dropped sharply.

[0110] Example 2:

[0111] All other conditions are the same as in Example 1, but combined with Figure 5 As shown, the second sensing unit 40 is located in the second area of ​​the second row (that is, in the center position).

[0112] Results: After 64 cycles, the battery capacity of 121 dropped drastically. At this time, the expansion pressure of the first area of ​​the first row was 9452N, the expansion pressure of the second area of ​​the first row was 9515N, and the expansion pressure of the third area of ​​the first row was 9645N; the expansion pressure of the first area of ​​the second row was 8790N, the expansion pressure of the second area of ​​the second row was 21057N, and the expansion pressure of the third area of ​​the second row was 9078N; the expansion pressure of the first area of ​​the third row was 8369N, the expansion pressure of the second area of ​​the third row was 8278N, and the expansion pressure of the third area of ​​the third row was 8430N.

[0113] Example 3:

[0114] All other conditions are the same as in Example 1, but combined with Figure 5 As shown, the second sensing unit 40 is located in the first area of ​​the first row (that is, the upper left corner).

[0115] Result: After 83 cycles, the battery capacity of 121 dropped sharply.

[0116] The comparison results of Examples 1, 2, and 3 show that stress concentration in the central region of battery 121 has a significant impact on cycle life. At the same time, according to the expansion pressure data of each region distributed in Example 2, stress concentration will also generate greater expansion pressure. Therefore, the battery 121 should avoid the concentration of expansion force in the central region during structural design.

[0117] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0118] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery measuring device for measuring the expansion force on the surface of a battery (121), characterized in that, The measuring device includes: The first plate (10) is used to support the battery (121). The second plate (20) is disposed at a distance from the first plate (10) along the first direction (X), and the second plate (20) can move up and down along the first direction (X); Multiple first sensing units (30) are disposed on the bottom surface of the second plate (20) facing the first plate (10), and the ends of all the first sensing units (30) facing away from the second plate (20) are collectively configured as a pressing surface for abutting against the battery (121) when the second plate (20) moves downward; And at least one second sensing unit (40) is disposed on the bottom surface of the second plate (20) facing the first plate (10), and one end of the second sensing unit (40) away from the second plate (20) protrudes from the pressure surface.

2. The measuring device according to claim 1, characterized in that, Projected along the first direction (X), all the first sensing units (30) and the second sensing units (40) are arranged in a matrix on the surface of the second plate (20).

3. The measuring device according to claim 2, characterized in that, The second sensing unit (40) is arranged at the corner of the matrix; and / or, The second sensing unit (40) is arranged in the middle region of the matrix.

4. The measuring device according to claim 1, characterized in that, The height difference between the second sensing unit (40) and the pressure surface is A, which satisfies 0.5mm≤A≤5mm.

5. The measuring device according to claim 1, characterized in that, The end of the second sensing unit (40) facing away from the second plate (20) is spherical, cylindrical or conical.

6. The measuring device according to any one of claims 1 to 5, characterized in that, The measuring device includes a fixing member (50), which is installed on the second plate (20) from the top surface of the second plate (20) away from the first plate (10). The first sensing unit (30) and the second sensing unit (40) are detachably fixed to the second plate (20) through the fixing member (50).

7. The measuring device according to claim 6, characterized in that, The fastener (50) is a screw; a fixing hole (21) adapted to the fastener (50) is formed on the surface of the second plate (20).

8. The measuring device according to any one of claims 1 to 5, characterized in that, Each of the first sensing units (30) includes a first acquisition part (31), a first connecting post (32) and a first base (33). The first base (33) is connected to the second plate (20), and the two ends of the first connecting post (32) are respectively connected to the first acquisition part (31) and the first base (33). All of the first collecting parts (31) together constitute the pressure surface; The second sensing unit (40) includes a second acquisition part (41), a second connecting post (42) and a second base (43). The second base (43) is connected to the second plate (20), and the two ends of the second connecting post (42) are respectively connected to the second acquisition part (41) and the second base (43). The second collecting part (41) protrudes from the pressing surface.

9. The measuring device according to claim 8, characterized in that, Projecting along the first direction (X), the first base (33) completely covers the first acquisition unit (31), and the second base (43) completely covers the second acquisition unit (41).

10. The measuring device according to claim 8, characterized in that, Projecting along the first direction (X), the first base (33) has a square structure and the first acquisition unit (31) has a square structure; The side length of the first base (33) is B1, 20.5mm≤B1≤22.8mm; the side length of the first acquisition unit (31) is B2, 19mm≤B2≤22.5mm.

11. The measuring device according to claim 8, characterized in that, The gap between two adjacent first acquisition units (31) is C, where 0mm≤C≤1mm.

12. The measuring device according to any one of claims 1-5, characterized in that, The first sensing unit (30) is a pressure sensor; and / or, The second sensing unit (40) is a pressure sensor.

13. The measuring device according to any one of claims 1-5, characterized in that, The measuring device includes: a frame (60), a drive unit (70), and a connecting plate (80). The drive unit (70) is fixed to the top side of the frame (60), and the first plate (10) is disposed on the bottom side of the frame (60). The connecting plate (80) is detachably connected to the second plate (20). The driving component (70) drives the second plate (20) to move up and down along the first direction (X) via the connecting plate (80).

14. The measuring device according to claim 13, characterized in that, The second plate (20) has positioning grooves (22) formed on both sides along the second direction (Y), and the connecting plate (80) has hooks (81) that cooperate with the positioning grooves (22) on both sides along the second direction (Y). The second direction (Y) is set to intersect with the first direction (X).

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