Test tool and test equipment

Abstract

The utility model discloses a test tool and test equipment, and relates to the technical field of batteries. The test tool comprises a clamp assembly, a movable piece, a force transmission assembly, a first force detection assembly and a second force detection assembly. The clamp assembly comprises a first end plate, a second end plate and a plurality of connecting pieces connected with the first end plate and the second end plate respectively. The movable part is connected to the plurality of connecting parts in a sliding manner along the first direction and is positioned between the first end plate and the second end plate; a test space is defined by the movable part, the plurality of connecting parts and the second end plate, and the plurality of single batteries are arranged in the test space; the force transmission assembly is fixedly connected with the movable part, and the force transmission assembly is configured to connect a plurality of battery monomers in the test space into a battery module so as to transmit the battery expansion force acting on the second end plate to the movable part; the second force detection assembly is located on the side, facing the second end plate, of the movable part and is configured to abut against the battery module. According to the technical scheme, the expansion force distribution of the battery monomer group can be reflected.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a testing fixture and testing equipment. Background Technology

[0002] During the charging and discharging process, changes in the material form, volume, or internal forces of the battery cell due to electrochemical reactions can cause the battery cell to expand. Taking lithium batteries as an example, during the charging and discharging process of lithium-ion batteries, the insertion and extraction of lithium ions between the positive and negative electrodes can cause changes in the volume of the electrode materials, thereby causing the battery cell to expand.

[0003] Since a battery device is composed of multiple battery cells, the expansion force distribution of these cells has significant spatial differences. Existing expansion force testing fixtures are usually designed for testing the expansion force of individual battery cells and cannot detect the expansion force distribution of multiple battery cells. Utility Model Content

[0004] In view of the above problems, this application provides a test fixture and test equipment, which aims to provide a test fixture capable of measuring the expansion force distribution of battery cell packs.

[0005] In a first aspect, this application provides a testing fixture, which includes a clamping assembly, a movable component, a force transmission assembly, a first force detection assembly, and a second force detection assembly. The clamping assembly includes a first end plate and a second end plate that are opposite to each other and spaced apart along a first direction, and a plurality of connecting members that connect the first end plate and the second end plate respectively. The movable component is slidably connected to the plurality of connecting members along the first direction and is located between the first end plate and the second end plate. The movable component, the plurality of connecting members, and the second end plate enclose and define a testing space for accommodating a plurality of battery cells arranged along the first direction. The movable component is a rigid component. The force transmission assembly is fixedly connected to the movable component and is configured to connect the plurality of battery cells in the testing space into a battery module to transmit the battery expansion force acting on the second end plate to the movable component. The first force detection assembly is disposed between the movable component and the first end plate. The second force detection assembly is disposed in the testing space and is located on the side of the movable component facing the second end plate. The second force detection assembly is configured to abut against the battery module.

[0006] Since the second end plate simulates the structure of the battery box's expansion beam or end plate, the force experienced by the battery cell closest to the second end plate and the end battery cell of the battery cell group within the battery box is essentially the same. For ease of description, the battery cell closest to the second end plate is defined as the end battery cell. Because forces are reciprocal, any object exerting a force is also necessarily a object receiving a force, meaning the exerting object experiences a reaction force. When the expansion force generated by multiple battery cells placed in the test space acts on the second end plate, the entire assembly of multiple battery cells and moving parts within the test space can move along the direction from the second end plate to the first end plate under the reaction force, thereby transmitting the force to the first force detection component. Thus, the first force detection component between the moving part and the first end plate measures the reaction force of the end battery cell on the battery expansion force of the second end plate. Since the magnitudes of the action and reaction forces are equal, the first force detection component reflects the battery expansion force of the end battery cell. Secondly, since the force transmission component is fixedly connected to the moving part, it connects multiple battery cells within the accommodating space to the battery module. In operation, the second force detection component is located between the moving part and the battery module, abutting against the module. Because the moving part is rigid, the battery cell closest to it cannot compress the module to gain expansion space. Therefore, the force situation of the battery cell closest to the moving part is essentially the same as that of the middle battery cell in the battery pack within the battery box. For ease of description, the battery cell closest to the moving part is defined as the middle battery cell. Since the second force detection component abuts against the middle battery cell, its expansion force directly acts on the second force detection component after expansion. Thus, the second force detection component reflects the expansion force of the middle battery cell.

[0007] The test fixture provided in this embodiment has a first force detection component that reflects the battery expansion force of the end battery cell and a second force detection component that reflects the expansion force of the middle battery cell. In this way, the test fixture can simultaneously obtain the expansion force data of the end battery cell and the middle battery cell, thereby reflecting the expansion force distribution of the battery cell group to a certain extent.

[0008] In some embodiments, the force transmission assembly includes multiple force transmission elements; wherein, a portion of the force transmission elements are configured to connect multiple battery cells within the test space into a battery module, and another portion of the force transmission elements are configured to connect the battery module to the movable component. Thus, by using some force transmission elements to connect multiple battery cells within the test space into a battery module, and another portion of the force transmission elements to connect the battery module to the movable component, it is possible to first connect multiple battery cells into a battery module in a convenient location, and then push the entire battery module into the test space. Only the connection between the module and the movable component needs to be addressed, which helps improve assembly efficiency, facilitates the replacement of new test pieces, and increases the loading efficiency of the test cycle.

[0009] In some embodiments, multiple battery cells within the test space have multiple sides extending along the first direction; multiple force transmission elements are disposed on at least two of the sides. Thus, by configuring force transmission elements on at least two sides, it is equivalent to multi-point positioning and constraint of the battery module in three-dimensional space. This helps the battery module transmit force along the first direction under the action of expansion force, which is ultimately measured by the first force detection component. This helps reduce force decomposition or measurement errors caused by battery module instability, thereby improving detection accuracy.

[0010] In some embodiments, the plurality of sides include two opposing side surfaces and opposing bottom and top surfaces; the surface where the terminal post of the battery cell is located is defined as the top surface; a force transmission component configured to connect the plurality of battery cells in the test space to form a battery module is a first force transmission component, and the first force transmission component is at least disposed on the bottom surface; a force transmission component configured to connect the battery module and the movable component is a second force transmission component, and the second force transmission component is disposed on the side surfaces. Thus, the structure of the battery cell assembly within the battery box is simulated, further improving the accuracy and reliability of the test data; by combining the second end plate and the movable component to limit the end faces of the plurality of battery cells in the test space, the working conditions of the battery device in actual use are simulated, further improving the accuracy and reliability of the test data.

[0011] In some embodiments, the first force transmission member is configured as a base, which is slidably connected to at least a portion of the connector; the plurality of battery cells in the test space are confined to the base. Thus, by first fixing the plurality of battery cells to the base, the base and the plurality of battery cells fixed to the base constitute a test module, which can be assembled, wired, and pre-inspected outside the test fixture; when it is necessary to test the expansion force of different battery cell groups, the operator does not need to disassemble the battery cells one by one, but only needs to remove the base from the test fixture and then install the other test modules to be tested, thereby reducing downtime and improving testing efficiency.

[0012] In some embodiments, the base includes a base plate and two connecting blocks disposed on the base plate. The two connecting blocks extend along a first direction and are arranged side by side along a second direction; the first direction and the second direction intersect perpendicularly; a receiving groove is defined between the base plate and the two connecting blocks, and multiple battery cells of the test space are disposed within the receiving groove; each connecting block is penetrated by at least one connector. Thus, the receiving groove can integrate multiple battery cells into a compact module, which not only facilitates transportation but also provides a robust, integrated protection and support structure for the battery cell assembly during testing. The two parallel connecting blocks, in conjunction with the connector, effectively provide two long-distance support points, reducing jamming during sliding of the base and thus improving the accuracy and reliability of the test data.

[0013] In some embodiments, there are multiple base supports, which are arranged sequentially along the first direction. By increasing or decreasing the number of base supports and adjusting the length of the connectors, the dimensions of the entire testing fixture along the first direction can be easily changed to accommodate battery packs of different thicknesses or numbers; thus, the versatility of the testing fixture can be improved, and material management and inventory pressure can be simplified.

[0014] In some embodiments, the second force transmission member is configured as a side plate, which is connected to the movable member; the side plate is configured to connect to multiple battery cells within the test space. Thus, the connection of the side plate to multiple battery cells within the test space can simulate the side plate structure of a battery box. The side plate itself can increase the rigidity and stability of the entire test fixture, helping to improve the accuracy and reliability of the test data.

[0015] In some embodiments, the second force detection assembly includes a support plate and a second force detection element; the support plate is disposed in the test space and configured to abut against the battery cell assembly, and the second force detection element is disposed between the battery cell and the moving member. Thus, the cooperation of the support plate and the second force detection element helps improve the accuracy of testing the expansion force of the central battery cell, and the support plate provides support for the battery cell, reducing the risk of battery failure or second force detection assembly failure due to excessive force or pressure.

[0016] In some embodiments, the abutment plate is slidably connected to at least a portion of the connector. This slidable connection provides mechanical restraint, preventing the abutment plate from easily detaching and helping to maintain it in the correct position, reducing the impact on battery module installation and thus improving installation efficiency.

[0017] In some embodiments, the movable member is configured as a movable plate, and a plurality of the connectors are respectively passed through the movable member; some of the connectors are passed through the abutment plate; the first force detection assembly is mounted on the first end plate, and the second force detection assembly is mounted on the movable member. Thus, the plurality of connectors passing through the movable member helps improve the connection stability between the movable member and other components; the partial connectors passing through the abutment plate improve the ease of installation and disassembly, helping to reduce the time required for installing and disassembling the abutment plate; the first force detection assembly being mounted on the first end plate helps reduce the impact of the weight of the first force detection assembly on the end expansion force. The second force detection assembly being mounted on the movable member helps reduce the impact of the weight of the second force detection assembly on the expansion force of the central battery.

[0018] In some embodiments, the first end plate is a rigid member, and / or the abutment plate is a rigid member. This can help improve the accuracy of test data.

[0019] In some embodiments, the thickness of the movable member along the first direction is not less than 30 mm; and / or, the thickness of the supporting plate along the first direction is not less than 30 mm; and / or, the thickness of the first end plate along the first direction is not less than 30 mm; and / or, the thickness of the second end plate along the first direction is not less than 10 mm and not more than 20 mm; and / or, the connector is configured as a rod with an outer diameter of not less than 10 mm. Within the above thickness range, the test fixture has good strength and stability, thus reducing deformation or failure during testing. The thicker components can provide sufficient support, which helps to improve the accuracy of test data.

[0020] In some embodiments, the first end plate and the second end plate each have a first end and a second end opposite to each other along a second direction, the first direction and the second direction intersecting perpendicularly; the first end of the first end plate and the first end of the second end plate are connected by at least two connectors, and the second end of the first end plate and the second end of the second end plate are connected by at least two connectors. Thus, together they constitute a robust and stable closed-loop load-bearing frame, which helps improve the accuracy of test data.

[0021] In some embodiments, the connector is configured as a rod having a first end and a second end opposite to each other in a first direction; the first end of the connector has a first connection hole, and the second end of the connector has a second connection hole; the test fixture further includes a plurality of fasteners, some of which pass through the first end plate and are connected to the first connection hole; and other fasteners pass through the second end plate and are connected to the second connection hole.

[0022] Secondly, this application also proposes a testing device, which includes:

[0023] The test fixture described in any of the foregoing embodiments;

[0024] A charging and discharging device, configured to electrically connect to multiple battery cells within the test space; and

[0025] A data acquisition device configured to be electrically connected to the first force detection component and the second force detection component.

[0026] 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

[0027] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0028] Figure 1 This is a schematic diagram of the structure of the test fixture in some embodiments of this application;

[0029] Figure 2 for Figure 1 A schematic diagram of the structure after the battery cells are loaded;

[0030] Figure 3 for Figure 2 A schematic diagram of the decomposed structure;

[0031] Figure 4 This is a schematic diagram of the battery module structure;

[0032] Figure 5 This is a schematic diagram of the structure of some embodiments of a battery cell pack;

[0033] Figure 6 This is a schematic diagram of the structure of a test device according to some embodiments of this application.

[0034] The reference numerals in the detailed embodiments are as follows:

[0035] 10. Test fixture; 10a. Test space; 11. Fixture assembly; 111. First end plate; 112. Second end plate; 113. Connector; 113a. First connecting hole; 113b. Second connecting hole;

[0036] 12. Moving parts; 13. Force transmission components; 130. Force transmission components; 130a. First force transmission component; 130b. Second force transmission component; 131. Base support; 131a. Base plate; 131b. Connecting block; 132. Side plate;

[0037] 14. First force detection component; 15. Second force detection component; 151. Support plate; 152. Second force detection component; 16. Fastener;

[0038] 1. Testing equipment; 20. Charging and discharging device; 30. Data acquisition device; 40. Control device;

[0039] 100, battery cell; 100a, end battery cell; 100b, middle battery cell;

[0040] 17. Battery cell assembly; 18. Battery module; 181. Side; 181a. Side side; 181b. Bottom side; 181c. Top side; x. First direction; y. Second direction.

[0041] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0042] 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.

[0043] 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.

[0044] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0045] 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.

[0046] In the description of the embodiments of this application, the term "and / or" is merely a description of the association 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. In the description of the embodiments of this application, the term "multiple" refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0047] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" 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 are not intended to 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.

[0048] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" 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. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0049] During the charging and discharging process, changes in the material form, volume, or internal forces of the battery cell due to electrochemical reactions cause the battery cell to exhibit expansion force. Taking lithium batteries as an example, during the charging and discharging process, the volume changes in the electrode materials caused by the insertion / extraction of lithium ions between the positive and negative electrodes, as well as the gas production from side reactions, lead to expansion force in the battery cell. In battery devices composed of multiple battery cells, due to the different structural constraints between the individual cells, the distribution of expansion force exhibits significant spatial differences, posing a severe challenge to the safety, cycle life, and module structure design of the battery device.

[0050] Currently, battery expansion force testing mostly focuses on the individual battery cell level. Therefore, this application proposes a testing fixture capable of measuring the expansion force distribution of a battery cell assembly.

[0051] According to some embodiments of this application, please refer to Figures 1 to 4 The test fixture 10 includes a clamp assembly 11, a movable component 12, a force transmission assembly 13, a first force detection assembly 14, and a second force detection assembly 15. The clamp assembly 11 includes a first end plate 111 and a second end plate 112 that are opposite to each other and spaced apart along a first direction x, and a plurality of connectors 113 that connect the first end plate 111 and the second end plate 112 respectively. The movable component 12 is slidably connected to the plurality of connectors 113 along the first direction x and is located between the first end plate 111 and the second end plate 112. The movable component 12 is a rigid component. The movable component 12, the plurality of connectors 113, and the second end plate 112 are connected to the second end plate 111. The plates 112 enclose and define a test space 10a; the force transmission component 13 is configured to connect multiple battery cells 100 within the test space 10a to form a battery module 18, and the force transmission component 13 is fixedly connected to the movable member 12 to transmit the battery expansion force acting on the second end plate 112 to the movable member 12; the first force detection component 14 is disposed between the movable member 12 and the first end plate 111; the second force detection component 15 is disposed within the test space 10a and located on the side of the movable member 12 facing the second end plate 112, and the second force detection component 15 is configured to abut against the battery module 18.

[0052] The fixture assembly 11 typically serves as the support and constraint frame for the entire tooling. The fixture assembly 11 includes a first end plate 111 and a second end plate 112 arranged opposite to and spaced apart along a first direction x, and a plurality of connectors 113 connecting the first end plate 111 and the second end plate 112 respectively. The first end plate 111 and the second end plate 112 typically provide opposite and spaced fixed supports in the arrangement direction of the battery cell pack 17, and the plurality of connectors 113 securely connect them to define a rigid structure, forming the structural basis of the test tooling 10. The connection between the plurality of connectors 113 and the first end plate 111 and the second end plate 112 can be a detachable connection or a non-detachable connection. The connectors 113 are typically configured as rods, but can also be plates, etc.; the number of connectors 113 can be two, three, four, five, or more.

[0053] The movable component 12 refers to a component located between the first end plate 111 and the second end plate 112, and slidable in a first direction x between the first end plate 111 and the second end plate 112. The movable component 12 is typically plate-shaped or block-shaped. In one example, the connecting component 113 is configured as a rod extending along the first direction x. In this case, the movable component 12 has a through hole, and the connecting component 113 passes through the through hole, thus allowing the movable component 12 to slide along the length of the rod. In another example, the connecting component 113 is configured as a connecting plate with a groove, and the movable component 12 has a slider. The slider on the movable component 12 engages with the groove on the connecting plate, and the slider slides within the groove along the first direction x, thereby enabling the movable component 12 to slide along the first direction x. The movable component 12 is a rigid component. A rigid component means that within the range of the testing fixture, the shape and size changes of the movable component 12 are extremely small, even negligible, during the operation of the testing fixture 10.

[0054] The force transmission component 13 is configured to connect multiple battery cells 100 within the test space 10a into a battery module 18. In other words, the relative positions of the multiple battery cells 100 within the test space 10a are essentially unchanged within the test fixture 10. The force transmission component 13, which connects the multiple battery cells 100 within the test space 10a into a single mechanical module, is also called the battery module 18. The force transmission component 13 is fixedly connected to the moving part 12. The connection between the force transmission component 13 and the moving part 12 can be either detachable or non-detachable, ensuring that the force transmission component 13 and the moving part 12 maintain a rigid connection with virtually no relative movement during operation of the test fixture 10. A detachable connection is generally understood as a connection method that allows the force transmission component 13 and the moving part 12 to be separated and reassembled without damaging any parts during assembly or maintenance. Even after multiple disassemblies and reassemblies, the force transmission component 13 and the moving part 12 maintain their original strength and precision. Detachable connections typically include threaded connections, keyed connections, pin connections, elastic snap-fit ​​connections, and quick-release components. Non-removable connections are generally understood to mean that once the connection is completed, the force transmission component 13 or the moving part 12 must be destroyed to disassemble it. Therefore, the connection is basically irreversible. Non-removable connections usually include welding, riveting, or interference fit.

[0055] The force transmission assembly 13 typically includes at least one force transmission element 130. The force transmission element 130 can be plate-shaped, rod-shaped, or block-shaped, etc. For example, the force transmission element 130 can be a connecting plate, cable tie, or clamp, etc. It is necessary to connect multiple battery cells 100 within the test space 10a into a battery module 18, and connect the battery module 18 and the movable element 12 into a whole. This whole can move along the first direction x. It is understood that during the movement along the first direction x, the relative positions of the battery module 18 and the movable element 12 remain basically unchanged. The number of force transmission elements 130 can be one or more. In one example, there is one force transmission component 130. This force transmission component 130 connects multiple battery cells 100 within the test space 10a into a single unit and is also connected to the movable component 12. In another example, there are two force transmission components 130. One force transmission component 130 connects the multiple battery cells 100 within the test space 10a into a single unit, namely a battery module 18. The other force transmission component 130 is connected to both the battery module 18 and the movable component 12. In this case, the connection between the other force transmission component 130 and the battery module 18 can be either directly connected to the multiple battery cells 100 within the test space 10a or connected to the force transmission component 130 on the battery module 18. Alternatively, both force transmission components 130 can be connected to the movable component 12 and simultaneously to the multiple battery cells 100. In short, the goal is to ensure that there is essentially no relative movement between the multiple battery cells 100 within the test space 10a and the movable component 12, and that they can move as a whole along the first direction x.

[0056] Force detection components are functional parts that convert battery expansion force into quantifiable electrical, optical, or digital signals for subsequent signal processing and data analysis. Typically, a force detection component consists of two main parts: a force sensing element and a mounting structure. The mounting structure is used to securely install the force sensing element, and its specific forms include, but are not limited to, mounting plates, mounting brackets, and fasteners such as bolts and clips, as well as ensuring reliable contact between the force sensing element and the battery, and enabling effective transmission of expansion force to the force sensing element. The force sensing element, as a functional component, typically includes a force-sensitive element and a signal conversion element, and has a preset operating range to test the battery expansion force under different operating conditions.

[0057] The working principle of the force detection device is as follows: The expansion force generated by the battery acts as an external force on the force-sensitive element, causing mechanical deformation or changes in its internal electrical parameters. The signal conversion element captures this deformation or electrical change and converts it into identifiable raw signals such as resistance changes, capacitance changes, piezoelectric charge, or optical wavelength shifts. Subsequently, the signal conditioning circuit amplifies, filters, and performs temperature compensation on the raw signal to reduce interference and improve signal accuracy, ultimately outputting a voltage signal, current signal, or digital data that conforms to industrial standards. Finally, the processed signal is output to external data acquisition or control equipment through a data interface to complete the quantitative test of the expansion force. In some examples, the force detection device can be a weighing force sensor. Weighing force sensors are a large family that use various mechanical structures to convert the physical quantity of "force" into an electrical signal that we can read and process. The selection of force detection devices includes, but is not limited to, resistance strain gauge sensors and piezoelectric sensors.

[0058] The first force detection component 14 is disposed between the movable member 12 and the first end plate 111. The first force detection component 14 can be mounted on the movable member 12 or on the first end plate 111, or it can be mounted in other ways. For example, the first force detection component 14 includes a first force detection element and a first mounting element, with the first force detection element mounted on the first mounting element, and the first mounting element slidably connected to the connecting member 113. The first force detection component 14 detects the force between the movable member 12 and the first end plate 111.

[0059] Since the force transmission component 13 is fixedly connected to the movable part, and the force transmission component 13 is configured to connect multiple battery cells 100 in the test space 10a into a battery module 18, it can transmit the battery expansion force acting on the second end plate 112 to the movable part 12. According to the characteristics of action and reaction forces, when the battery expansion force of the battery cell 100 acts on the second end plate 112, the second end plate 112 gives the whole a reaction force, so that the multiple battery cells 100 and the movable part 12 in the test space 10a can move as a whole along the first direction x. In this way, the space between the movable part 12 and the first end plate 111 is compressed. This compressed space is reflected in the force-sensitive element of the first force detection component 14.

[0060] The second force detection component 15 is disposed within the test space 10a and located on the side of the movable member 12 facing the second end plate 112. The second force detection component 15 can be mounted on the movable member 12 or on the connector 113. For example, in one example, the second force detection component 15 can also be disposed within the accommodating space and located on the side of the movable member 12 facing the second end plate 112, without direct mechanical constraint connection with other components. Since the second force detection component 15 is configured to abut against the battery module 18, that is, in the working state of the test fixture 10, one side of the second force detection component 15 abuts against the battery module 18, and the other side abuts against the movable member. In another example, the second force detection assembly 15 includes a second force detection element 152 and a second mounting element. The second force detection element 152 is mounted on the second mounting element, which is slidably connected to the connector 113. Since the second force detection assembly 15 is configured to abut against the battery module 18, that is, in the working state of the test fixture 10, one side of the second force detection assembly 15 abuts against the battery module 18, and the other side abuts against the movable member 12. In yet another example, the second force detection assembly 15 includes a second force detection element 152 and a supporting plate 151. The supporting plate 151 is slidably mounted on at least a portion of the connector 113 and is located between the movable member 12 and the second end plate 112. The supporting plate 151 is configured to abut against the battery module 18, and the second force detection element 152 is disposed between the supporting plate 151 and the movable member 12.

[0061] In a battery device, the arrangement of the individual battery cells 100 is related to the distribution of expansion forces. Typically, a battery device includes at least one group of battery cells 17, such as... Figure 5As shown, multiple battery cells 100 arranged sequentially along the first direction x within the battery cell group 17 are connected to the battery box by adhesive. This results in significant spatial differences in the expansion force distribution of battery cells 100 at different positions within the battery cell group 17. Typically, the expansion force of the middle battery cell 100b is greater than that of the end battery cell 100a. This is because the middle battery cell 100b is subjected to compression from the battery cells 100 on both sides, and its expansion is restricted by the equally rigid battery cells 100 on both sides, preventing the force from being effectively released, leading to stress accumulation and a larger expansion force. On the other hand, the end battery cell 100a is directly connected to the expansion beam or end plate on one side, and is only subjected to compression from the adjacent battery cells 100 on one side. The force on one side can be buffered and released by the elastic deformation of the expansion beam or end plate, so the actual expansion force is the smallest.

[0062] Given the aforementioned uneven distribution of expansion force, this embodiment provides a simpler solution for measuring the expansion force distribution of the battery cell assembly 17 and for using a simpler testing fixture 10. This involves selecting a subset of the battery cell assembly 17 for testing, typically keeping the size of this subset to no more than half the total number of battery cell assemblies 17. As mentioned earlier, the middle battery cell 100b is subjected to pressure from the battery cells 100 on both sides. Its expansion is restricted by the equally rigid battery cells 100 on both sides, preventing effective release of expansion force and leading to stress accumulation and a larger expansion force. Generally, the middle battery cell 100 experiences the greatest expansion force. Conversely, the end battery cell 100a, directly connected to the expansion beam or end plate on one side, is only subjected to pressure from the adjacent battery cell 100 on one side. The force on one side can be buffered and released through the elastic deformation of the expansion beam or end plate, resulting in the smallest actual expansion force. Thus, measuring the expansion force of the middle battery cell 100 and the end battery cells 100 can roughly reflect the expansion force distribution range of the battery cell assembly 17. In one example, in... Figure 2 and Figure 5 In the battery cell group 17, there are 16 battery cells 100. We selected 8 as test samples. Of course, we can also select 7, 6, 5, 4, 3 or 2 battery cells 100 for testing.

[0063] Since the second end plate 112 simulates the structure of the expansion beam or end plate of the battery box, the battery cell 100 closest to the second end plate 112 and the end battery cell of the battery cell group are subjected to basically the same force in the battery box. For ease of description, the battery cell 100 closest to the second end plate 112 is defined as the end battery cell 100a. Since forces are reciprocal, any object exerting a force is also necessarily a object receiving a force, meaning that the object exerting the force experiences a reaction force. When the expansion force generated by the multiple battery cells 100 placed in the test space 10a acts on the second end plate 112, the entire assembly consisting of the multiple battery cells 100 and the movable part 12 in the test space 10a can move along the direction from the second end plate 112 to the first end plate 111 under the reaction force, thereby transmitting the force to the first force detection component 14. Thus, the first force detection component 14 between the movable part 12 and the first end plate 111 measures the reaction force of the end battery cell 100a on the second end plate 112. Since the magnitudes of the action force and the reaction force are equal, the first force detection component 14 reflects the battery expansion force of the end battery cell 100a.

[0064] Secondly, since the force transmission component 13 is fixedly connected to the movable component 12, the force transmission component 13 connects multiple battery cells 100 in the accommodating space to the battery module 18. In the working state, the second force detection component 15 is located between the movable component 12 and the battery module 18, and the second force detection component 15 abuts against the battery module 18. Because the movable component 12 is a rigid component, the battery cell 100 closest to the movable component 12 cannot compress the movable component 12 to obtain expansion space. Thus, the force situation of the battery cell 100 closest to the movable component 12 is basically the same as the actual force situation of the middle battery cell 100b in the battery cell group 17 within the battery box. For ease of description, the battery cell 100 closest to the movable component 12 is defined as the middle battery cell 100b. Since the second force detection component 15 abuts against the middle battery cell 100b, after the middle battery cell 100b expands, its expansion force can directly act on the second force detection component 15. Therefore, the second force detection component 15 reflects the expansion force of the middle battery cell 100b.

[0065] The test fixture 10 provided in this embodiment has a first force detection component 14 that reflects the battery expansion force of the end battery cell 100a and a second force detection component 15 that reflects the expansion force of the middle battery cell 100b. In this way, the expansion force data of the end battery cell 100a and the middle battery cell 100b can be obtained at the same time, thereby reflecting the expansion force distribution of the battery cell group 17 to a certain extent.

[0066] In some embodiments, please refer to Figures 1 to 3The force transmission component 13 includes multiple force transmission elements 130; among them, a portion of the force transmission elements 130 are used to connect multiple battery cells 100 housed in the test space 10a to form a battery module 18, and another portion of the force transmission elements 130 are used to connect the battery module 18 and the moving part 12.

[0067] The number of force transmission components 130 can be two, three or four. Some of the force transmission components 130 connect multiple battery cells 100 in the test space 10a to form a battery module 18, while other force transmission components 130 connect the battery module 18 to the moving component 12. In one example, there are two force transmission components 130, which are referred to as the first force transmission component 130a and the second force transmission component 130b for ease of description. The first force transmission component 130a connects multiple battery cells 100 in the test space 10a to form a battery module 18. The second force transmission component 130b connects the battery module 18 and the movable component 12. Alternatively, the second force transmission component 130b can be connected to both the first force transmission component 130a and the movable component 12. Or, the second force transmission component 130b can be connected to both the battery cells 100 in the test space 10a and the movable component 12. Alternatively, the second force transmission component 130b can be connected to both the battery cells 100 in the test space 10a and the first force transmission component 130a and the movable component 12. In this case, the second force transmission component 130b is connected to at least one battery cell 100 in the test space 10a.

[0068] In this embodiment, multiple battery cells 100 within the test space 10a are connected into a battery module 18 via a portion of the force transmission component 130. Another portion of the force transmission component 130 connects the battery module 18 to the movable component 12. This allows multiple battery cells 100 to be connected into a battery module 18 in a convenient location before the entire battery module 18 is pushed into the test space 10a. Only the connection between the module and the movable component 12 needs to be addressed, which helps improve assembly efficiency, facilitates the replacement of new test workpieces, and increases the loading efficiency of the test cycle.

[0069] In some embodiments, please refer to Figures 2 to 4 Multiple battery cells 100 within the test space 10a have multiple sides 181 extending along a first direction x; multiple force transmission elements 130 are disposed on at least two sides 181.

[0070] The number of sides 181 can be four, five, six, or more. These multiple sides 181 extending along the first direction x are typically defined according to the shape of the battery cell 100, for example, as... Figure 4The battery cell 100 shown has a rectangular or nearly rectangular orthographic projection along the first direction x, in which case the number of sides 181 is four. Alternatively, in embodiments where the orthographic projection of the battery cell 100 along the first direction x is pentagonal or hexagonal, the number of sides 181 can be five or six, etc. Multiple force transmission members 130 are disposed on at least two sides 181. These at least two sides 181 can be any two sides 181 extending along the first direction x, that is, they can be two adjacent sides 181 or non-adjacent sides 181.

[0071] In this embodiment, by configuring force transmission components 130 on at least two sides 181, it is equivalent to performing multi-point positioning and constraint on the battery module 18 in three-dimensional space. This helps the battery module 18 to transmit force along the first direction x under the action of expansion force, and finally be measured by the first force detection component 14. This helps to reduce force decomposition or measurement errors caused by the instability of the battery module 18, thereby improving the accuracy of detection.

[0072] In some embodiments, please refer to Figure 4 And further reading Figure 2 and Figure 3 The plurality of sides 181 include two opposing side sides 181a and opposing bottom side side 181b and top side side 181c; the surface where the terminals of the plurality of battery cells 100 are located is defined as the top side side 181c; the force transmission member 130 configured to connect the plurality of battery cells 100 in the test space 10a to form a battery module 18 is a first force transmission member 130a; the first force transmission member 130a is at least disposed on the bottom side side 181b; the force transmission member 130 configured to connect the battery module 18 and the movable member 12 is a second force transmission member 130b; the force transmission member 130 configured to connect the battery module 18 and the movable member 12 is a second force transmission member 130b, and the second force transmission member 130b is disposed on the side side 181a.

[0073] Generally, the terminals of multiple battery cells 100 are usually connected between adjacent battery cells 100 through components such as busbars. In this embodiment, the surface where the terminals of multiple battery cells 100 are located is defined as the top side surface 181c, which serves as the upper surface of the battery module 18. This facilitates the connection of the busbars. Furthermore, the force transmission components 130 that fix the multiple battery cells 100 are arranged on other sides 181 where no busbars are provided can reduce terminal damage and loosening during testing, and help improve the independence and accuracy of test data acquisition.

[0074] The force transmission element 130 configured to connect multiple battery cells 100 within the test space 10a to form a battery module 18 is a first force transmission element 130a. The first force transmission element 130a is at least located on the bottom side surface 181b; that is, the first force transmission element 130a may be located solely on the bottom side surface 181b, or it may be partially located on the bottom side surface 181b with another portion located on at least one side surface 181a. Figure 1 and Figure 2 As shown, most of the first force transmission member 130a is located on the bottom side 181b, and a small portion is located on the side side 181a. The force transmission member 130 configured to connect the battery module 18 and the movable member 12 is the second force transmission member 130b, which is located on the side side 181a. This second force transmission member 130b can be located on one side side 181a or both side sides 181a can have the second force transmission member 130b. Thus, by placing the first force transmission member 130a on the bottom side 181b, a stable base is provided for the battery module 18, reducing the risk of sinking or shifting of the battery cell assembly 17 during testing due to gravity or uneven force. Secondly, all battery cells 100 can be assembled into a module on the first force transmission member 130a at the bottom (which can be imagined as a tray or base), and then the whole module can be pushed into the test space 10a. Finally, the second force transmission member 130b (which can be imagined as a quick-release lever) on the side 181a is connected to the movable member 12.

[0075] This embodiment simulates the structure of the battery cell group 17 inside the battery box, further improving the accuracy and reliability of the test data; by combining the second end plate 112 and the movable part 12 to limit the end faces of multiple battery cells 100 in the test space 10a, the working conditions of the battery device in actual use are simulated, further improving the accuracy and reliability of the test data.

[0076] In some embodiments, please refer to Figure 2 The first force transmission element 130a is configured as a base 131, which is slidably connected to at least a portion of the connector 113, and a plurality of battery cells 100 in the test space 10a are located on the base 131.

[0077] The base 131 typically refers to a component or structure located at the bottom that provides support, stabilization, or other support functions. In one example, the connector 113 is configured as a rod extending along a first direction x. In this case, the base 131 has a connecting through hole through which the connector 113 passes. Thus, the base 131 can slide along the length of the rod, thereby moving multiple battery cells 100 along the first direction x. In another example, the connector 113 is configured as a connecting plate with a groove or rail. The base 131 has a slider. The slider on the base 131 engages with the groove on the connecting plate, and slides within the groove along the first direction x, thereby enabling the base 131 to slide along the first direction x.

[0078] Multiple battery cells 100 in the test space 10a are fixed to the base 131. For example, the base 131 and the multiple battery cells 100 in the test space 10a can be connected by adhesive. In this way, the connection relationship between the battery cells 100 and the battery box in the battery device is most similar, and the value of the battery expansion force is more accurate. Of course, in some embodiments, the multiple battery cells 100 in the test space 10a can be fixed by a mechanical fixing structure. For example, the base 131 is provided with a limiting groove, and a part of the battery cell 100 is inserted into the limiting groove, thereby limiting the multiple battery cells 100. Generally speaking, the smaller part of the battery cell 100 is located in the limiting groove, and the battery cell 100 contacts or abuts the groove wall to reduce the influence of the limiting groove on the expansion force of the battery cell 100.

[0079] In this embodiment, multiple battery cells 100 are first fixed on the base 131. The base 131 and the multiple battery cells 100 fixed on the base 131 constitute a test module. This test module can be assembled, wired, and pre-inspected outside the test fixture 10. When it is necessary to test the expansion force of different battery cell groups, the operator does not need to disassemble the battery cells one by one. He only needs to take the base 131 out of the test fixture 10 and then install the other test modules to be tested, which can reduce downtime and improve testing efficiency.

[0080] In some embodiments, please refer to Figures 1 to 3 The base 131 includes a base plate 131a and two connecting blocks 131b disposed on the base plate 131a. The two connecting blocks 131b extend along a first direction x and are arranged side by side along a second direction y. The first direction x and the second direction y intersect perpendicularly. A receiving groove is defined between the base plate 131a and the two connecting blocks 131b. Multiple battery cells 100 of the test space 10a are disposed in the receiving groove. Each connecting block 131b is penetrated by at least one connector 113.

[0081] The base plate 131a serves as both a load-bearing and mounting surface. Two connecting blocks 131b, arranged in parallel on the base plate 131a, cooperate with the connector 113 to fix or guide the battery cell 100. The receiving groove, enclosed by the base plate 131a and the two connecting blocks 131b, accommodates and restricts the movement of the battery cell 100 along the second direction y. The base plate 131a bears the weight, while the connecting blocks 131b on both sides act like guardrails, hindering the movement of the battery cell 100 in the second direction y. Furthermore, the receiving groove integrates multiple battery cells 100 into a compact module, which not only facilitates transportation but also provides a robust protective and support structure for the battery cell assembly 17 during testing. The two parallel connecting blocks 131b, cooperating with the connector 113, effectively provide two long-distance support points, reducing jamming of the base 131 during sliding and thus improving the accuracy and reliability of test data.

[0082] In some embodiments, please refer to Figures 1 to 3 There are multiple base supports 131, and the multiple base supports 131 are arranged sequentially along the first direction x.

[0083] The number of base supports 131 can be two, three, four, or more. Generally, one base support 131 can support a certain number of battery cells 100. Different numbers of base supports 131 can accommodate connectors 113 and side plates 132 of different lengths. By increasing or decreasing the number of base supports 131 and adjusting the length of connectors 113, the dimensions of the entire test fixture 10 along the first direction x can be easily changed, thereby adapting to battery cell groups 17 of different thicknesses or numbers. Thus, there is no need to redesign, develop, and verify a completely new test fixture 10 for each new battery cell 100 or battery device model. Based on this platform-based solution, only a few standard-specification components need to be stocked, and various product requirements can be met through arrangement and combination. This simplifies material management and inventory pressure, enables standardization and mass production, reduces the types of molds and tooling fixtures, and allows for a relatively fixed production line, improving production efficiency. This embodiment improves the versatility of the test fixture 10 and simplifies material management and inventory pressure.

[0084] In some embodiments, please refer to Figures 1 to 3 The second force transmission component 130b is configured as a side plate 132, which is connected to the movable component 12; the side plate 132 is configured to connect to multiple battery cells 100 within the test space 10a.

[0085] In this design, the side plate 132, as a long strip-shaped structural component, differs from the base support 131, which primarily bears vertical forces. The side plate 132 provides lateral stiffness and constraint for the entire battery module 18. During testing, the individual battery cells 100 generate expansion forces and tend to spread outwards. The side plate 132 effectively restricts this movement, providing lateral stiffness and overall integrity to the battery module 18. The second force transmission component 130b can have one or more side plates, such as two, three, or four. Thus, the side plate 132 connects to multiple individual battery cells 100 within the test space 10a, simulating the structure of the battery box's side plate 132. The side plate 132 itself increases the rigidity and stability of the entire test fixture 10, thereby improving the accuracy and reliability of the test data.

[0086] In some embodiments, please refer to Figures 1 to 3 The second force detection component 15 includes a support plate 151 and a second force detection element 152; the support plate 151 is disposed in the test space 10a and is configured to abut against the battery module 18; the second force detection element 152 is disposed between the support plate 151 and the movable element 12.

[0087] The supporting plate 151 is located in the test space 10a. Its main function is to make surface contact with the battery module 18 and provide a certain support force so that the expansion force generated by the aforementioned middle battery cell 100b is evenly transmitted to the second force detection component 152, thereby reducing battery failure or failure of the second force detection component 15 due to excessive force or pressure.

[0088] In this embodiment, the cooperation of the abutment plate 151 and the second force detection component 152 helps to improve the accuracy of the test of the expansion force of the middle battery cell 100b. The abutment plate 151 provides support for the battery cell 100, reducing battery failure or failure of the second force detection component 15 due to excessive force or pressure.

[0089] In some embodiments, please refer to Figures 1 to 3 The abutment plate 151 is slidably connected to at least part of the connector 113.

[0090] The abutment plate 151 is slidably connected to at least a portion of the connector 113. In one example, the connector 113 is configured as a rod extending along a first direction x. In this case, the abutment plate 151 has a through hole through which the connector 113 passes, allowing the abutment plate 151 to slide along the length of the rod. In another example, the connector 113 is configured as a connecting plate with a groove. The abutment plate 151 has a slider. The slider on the abutment plate 151 engages with the groove on the connecting plate, and slides within the groove along the first direction x, thereby enabling the abutment plate 151 to slide along the first direction x.

[0091] In this embodiment, the abutment plate 151 is slidably connected to at least part of the connector 113, so that the abutment plate 151 has a certain mechanical limit and will not easily fall off, which helps the abutment plate 151 to stay in the corresponding position, reduce the impact on the installation of the battery module 18, and thus improve the installation efficiency of the battery module 18.

[0092] In some embodiments, the movable member 12 is configured as a movable plate, and a plurality of connectors 113 are respectively disposed on the movable member 12; some connectors 113 are disposed on the abutment plate 151; a first force detection component 14 is mounted on a first end plate 111, and a second force detection component 152 is mounted on the movable member 12.

[0093] The movable component 12 is configured as a movable plate, with multiple connectors 113 passing through it to ensure stable connection between the movable component 12 and other components. These connectors 113 provide support and fixation, allowing the movable component 12 to maintain good positioning during movement. Furthermore, by providing multiple connectors 113 on the movable component 12, the force acting on it can be evenly distributed, reducing force concentration in a specific area and thus improving the accuracy of test data. Some connectors 113 pass through the supporting plate 151, providing a certain mechanical limit to the supporting plate 151, preventing it from easily detaching and helping it maintain its position. However, too many connections might affect the ease of installation and disassembly of the supporting plate 151.

[0094] Because the sliding connection between the movable member 12 and the connecting member 113 is difficult to achieve perfectly smooth, the first force detection component 14 is mounted on the first end plate 111. The first force detection component 14 does not need to move with the movable member 12, meaning there is no sliding friction force transferred from the weight of the first force detection component 14 to the connecting member 113. This helps reduce the impact of the weight of the first force detection component 14 on the end expansion force. Similarly, the second force detection component 152 is mounted on the movable member 12. Thus, the second force detection component 152 does not need to move with the abutment plate 151, meaning there is no sliding friction force transferred from the weight of the second force detection component 152 to the connecting member 113. This helps reduce the impact of the weight of the second force detection component 152 on the expansion force of the middle battery.

[0095] In this embodiment, multiple connectors 113 are respectively inserted through the movable member 12, which helps to improve the connection stability between the movable member 12 and other components; some connectors 113 are inserted through the abutment plate 151, which can improve the convenience of installation and disassembly and help to reduce the time for installation and disassembly of the abutment plate 151; the first force detection component 14 is installed on the first end plate 111, which helps to reduce the influence of the weight of the first force detection component 14 on the end expansion force. The second force detection component 152 is installed on the movable member 12, which helps to reduce the influence of the weight of the second force detection component 152 on the expansion force of the middle battery.

[0096] In some embodiments, please refer to Figure 1 The first end plate 111 is also a rigid component; and / or, the abutment plate 151 is also a rigid component.

[0097] The term "rigid component" refers to components whose shape and size changes are extremely small, or even negligible, during operation of the test fixture within its measurement range. This reduces the impact of deformation of the test fixture 10's own structure on the test data, thereby further improving the accuracy of the test data.

[0098] In some embodiments, please refer to Figure 1 The thickness of the movable part 12 along the first direction x is not less than 30 mm; and / or, the thickness of the abutment plate 151 along the first direction x is not less than 30 mm; and / or, the thickness of the first end plate 111 along the first direction x is not less than 30 mm; and / or, the thickness of the second end plate 112 along the first direction x is not less than 10 mm and not more than 20 mm; and / or, the connector 113 is configured as a rod with an outer diameter of not less than 10 mm.

[0099] The moving part 12, the supporting plate 151, the first end plate 111, and the connector 113 are typically made of steel, usually carbon steel, which generally requires high strength, wear resistance, toughness, and good machinability. The material and thickness of the second end plate 112 are usually determined based on the end stiffness of the battery module or battery box to be tested, that is, it is usually necessary to simulate the stiffness of the battery box. The second end plate 112 usually has a certain degree of deflection. The thickness of the end plate of the battery box is usually between 10mm and 20mm. For example, the thickness of the second end plate 112 includes, but is not limited to, 10mm, 12mm, 14mm, 15mm, 16mm, 18mm, or 20mm.

[0100] Since the expansion force of the middle battery cell 100b also needs to be measured simultaneously in this embodiment, the movable member 12, the supporting plate 151, and the first end plate 111 are generally considered to have structural strength without deflection. That is, generally speaking, the thickness of the movable member 12 along the first direction x is not less than 30mm; the thickness of the supporting plate 151 along the first direction x is not less than 30mm; the thickness of the first end plate 111 along the first direction x is not less than 30mm; the thickness values ​​of the movable member 12, the supporting plate 151, and the first end plate 111 can be the same or different; for example, the thickness values ​​of the movable member 12, the supporting plate 151, and the first end plate 111 include, but are not limited to, 30mm, 32mm, 35mm, 36mm, 38mm, 40mm, 42mm, 44mm, 45mm, 46mm, 48mm, or 50mm. Thus, within the aforementioned thickness range, the moving part 12, the supporting plate 151, and the first end plate 111 provide the test fixture 10 with good strength and stability, reducing deformation or failure during testing. The thicker components provide sufficient support, which helps improve the accuracy of test data.

[0101] In some embodiments, please refer to Figures 1 to 3 The first end plate 111 and the second end plate 112 have a first end and a second end that are opposite each other along the second direction y, and the first direction x and the second direction y intersect perpendicularly; the first end of the first end plate 111 and the first end of the second end plate 112 are connected by at least two connectors 113, and the second end of the first end plate 111 and the second end of the second end plate 112 are connected by at least two connectors 113.

[0102] The first end of the first end plate 111 and the first end of the second end plate 112 are connected by at least two connectors 113, and the second end of the first end plate 111 and the second end of the second end plate 112 are connected by at least two connectors 113, together forming a robust and stable closed force-bearing frame. This frame is the structural basis for the entire scheme to accurately and reliably test the battery expansion force, laying the foundation for obtaining real measurement data and helping to improve the accuracy of the test data.

[0103] In some embodiments, please continue reading Figure 3 The connector 113 is configured as a rod, and the connector 113 has a first end and a second end opposite to each other along a first direction x; the first end of the connector 113 is provided with a first connecting hole 113a, and the second end of the connector 113 is provided with a second connecting hole 113b; the test fixture 10 also includes a plurality of fasteners 16, some of which pass through the first end plate 111 and are connected to the first connecting hole 113a; and other fasteners 16 pass through the second end plate 112 and are connected to the second connecting hole 113b.

[0104] The first connecting hole 113a and the second connecting hole 113b can be through holes or threaded holes. The fastener 16 can be a pin, rivet, screw, or bolt, etc. For example, when the first connecting hole 113a and the second connecting hole 113b are through holes, the fastener 16 can be a pin or rivet; when the first connecting hole 113a and the second connecting hole 113b are threaded holes, the fastener 16 can be a screw or bolt, etc. A large preload can be applied to the rod body using the fastener 16. The preload significantly improves the rigidity and natural frequency of the entire frame, making it almost undeformed when subjected to test loads, thus helping to improve the accuracy of expansion force testing.

[0105] In some embodiments, please refer to Figures 1 to 6The testing fixture 10 is used to test the expansion force of the battery cell assembly 17, which includes multiple battery cells 100 arranged along a first direction x. The testing fixture 10 includes a clamp assembly 11, a movable member 12, a force transmission assembly 13, a first force detection assembly 14, and a second force detection assembly 15. The clamp assembly 11 includes a first end plate 111 and a second end plate 112 arranged opposite to each other and spaced apart along the first direction x, and multiple connectors 113 connecting the first end plate 111 and the second end plate 112 respectively. The movable member 12 is slidably connected to the multiple connectors 113 along the first direction x and is located between the first end plate 111 and the second end plate 112. The movable member 12 and the multiple connectors 113... The test space 10a is defined by the enclosure between the 3 and the second end plate 112, and multiple battery cells 100 are disposed within the test space 10a. The movable member 12 is a rigid member. The force transmission component 13 is fixedly connected to the movable member 12, and the force transmission component 13 is configured to connect the multiple battery cells 100 within the test space 10a into a battery module 18, so as to transmit the battery expansion force acting on the second end plate 112 to the movable member 12. The first force detection component 14 is disposed between the movable member 12 and the first end plate 111. The second force detection component 15 is disposed within the test space 10a and is located on the side of the movable member 12 facing the second end plate 112. The second force detection component 15 is configured to abut against the battery module 18.Further, the force transmission assembly 13 includes multiple force transmission elements 130; wherein, a portion of the force transmission elements 130 are configured to connect multiple battery cells 100 within the test space 10a to form a battery module 18, and another portion of the force transmission elements 130 are configured to connect the battery module 18 and the movable element 12; further, the multiple battery cells 100 within the test space 10a have multiple sides 181 extending along a first direction x; the multiple force transmission elements 130 are disposed on at least two sides 181; further, the multiple sides 181 include opposing side sides 181a, opposing bottom sides 181b, and top sides 181c; the surface where the terminals of the multiple battery cells 100 are located is defined as the top side 181c; the force transmission element 130 configured to connect the multiple battery cells 100 within the test space 10a to form a battery module 18 is a first force transmission element 130a, and the first force transmission element 130a is disposed at least on the bottom side 181b; configured to connect the battery The force transmission element 130 of module 18 and movable element 12 is a second force transmission element 130b, which is disposed on the side surface 181a; further, the first force transmission element 130a is configured as a base 131, which is slidably connected to at least part of the connecting element 113; multiple battery cells 100 in the test space 10a are confined on the base 131; further, the base 131 includes a base plate 131a and two connecting blocks 131 disposed on the base plate 131a. b. Two connecting blocks 131b extend along the first direction x and are arranged side by side along the second direction y; the first direction x and the second direction y intersect perpendicularly; a receiving groove is defined between the base plate 131a and the two connecting blocks 131b, and multiple battery cells 100 in the test space 10a are disposed in the receiving groove; each connecting block 131b is penetrated by at least one connector 113; furthermore, there are multiple base supports 131, and the multiple base supports 131 are arranged sequentially along the first direction x.Further, the second force transmission member 130b is configured as a side plate 132, which is connected to the movable member 12; the side plate 132 is configured to connect to a plurality of battery cells 100 within the test space 10a; further, the second force detection assembly 15 includes a supporting plate 151 and a second force detection member 152; the supporting plate 151 is disposed in the test space 10a and is configured to abut against the battery module 18, and the second force detection member 152 is disposed between the supporting plate 151 and the movable member 12; further, the supporting plate 151 is connected to at least a portion of the connecting members. 113 sliding connection; further, the movable member 12 is configured as a movable plate, and multiple connectors 113 are respectively passed through the movable member 12; some connectors 113 are passed through the abutment plate 151; a first force detection assembly 14 is installed on the first end plate 111, and a second force detection assembly 152 is installed on the movable member 12; further, the thickness of the movable member 12 along the first direction x is not less than 30 mm; and / or, the thickness of the abutment plate 151 along the first direction x is not less than 30 mm; and / or, the thickness of the first end plate 111 along the first direction x is not less than 30 mm; And / or, the thickness of the second end plate 112 along the first direction x is not less than 10 mm and not more than 20 mm; and / or, the connector 113 is configured as a rod with an outer diameter of not less than 10 mm; further, the first end plate 111 and the second end plate 112 respectively have a first end and a second end opposite each other along the second direction y, the first direction x and the second direction y intersecting perpendicularly; the first end of the first end plate 111 and the first end of the second end plate 112 are connected by at least two connectors 113, and the second end of the first end plate 111 and the second end of the second end plate 112 are connected by at least two connectors 113. The ends are connected by at least two connectors 113; further, the connectors 113 are configured as rods, and the connectors 113 have a first end and a second end opposite to each other along a first direction x; the first end of the connectors 113 is provided with a first connection hole 113a, and the second end of the connectors 113 is provided with a second connection hole 113b; the test fixture 10 also includes a plurality of fasteners 16, some of which pass through the first end plate 111 and are connected to the first connection hole 113a; and other fasteners 16 pass through the second end plate 112 and are connected to the second connection hole 113b.

[0106] This application also proposes a testing device 1, which includes a testing fixture 10, a charging / discharging device 20, and a data acquisition device 30, as described in any of the foregoing embodiments. The charging / discharging device 20 is configured to be electrically connected to a plurality of battery cells 100 within the testing space 10a; the data acquisition device 30 is configured to be electrically connected to a first force detection component 14 and a second force detection component 15. The specific structure of the testing fixture 10 is as described in the above embodiments. Since this testing device 1 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0107] The charging and discharging device 20 and the data acquisition device 30 are usually also connected to the control device 40. The charging and discharging device 20 is used to electrically connect multiple battery cells 100 in the test space to charge and discharge the battery cells 100. The data acquisition device 30 is electrically connected to the first force detection component 14 and the second force detection component 15 to collect the test data of the first force detection component 14 and the second force detection component 15 and output it to the control device 40. The control device 40 can be unique to the test equipment 1 or it can be shared with other equipment.

[0108] Test fixture 10 according to Figure 1 Assemble the components as shown, and install the selected subset of battery cells 100 into the test space 10a. Further, connect the battery cells 100 and force transmission component 13 within the test space 10a with adhesive, and electrically connect multiple battery cells 100 within the test space 10a via a busbar. Finally, electrically connect the charging / discharging device 20 to the busbar, and electrically connect the data acquisition device 30 to the first force detection component 14 and the second force detection component 15 respectively. Control the charging / discharging device 20 to charge and discharge using the control device 40, and finally, collect and output the test data from the first force detection component 14 and the second force detection component 15 using the data acquisition device 30.

[0109] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A testing fixture, characterized in that, The test fixture includes: A clamping assembly, the clamping assembly including a first end plate and a second end plate that are opposite to each other and spaced apart along a first direction, and a plurality of connectors that connect the first end plate and the second end plate respectively; A movable component is slidably connected to a plurality of connecting components along the first direction and located between the first end plate and the second end plate; the movable component, the plurality of connecting components, and the second end plate enclose and define a test space for accommodating a plurality of battery cells arranged along the first direction; the movable component is a rigid component. A force transmission component is fixedly connected to the movable component, and the force transmission component is configured to connect multiple battery cells in the test space into a battery module so as to transmit the battery expansion force acting on the second end plate to the movable component. A first force detection component is disposed between the movable member and the first end plate; and A second force detection component is disposed within the test space and located on the side of the movable member facing the second end plate. The second force detection component is configured to abut against the battery module.

2. The test fixture as described in claim 1, characterized in that, The force transmission component includes multiple force transmission elements; wherein, a portion of the force transmission elements are configured to connect multiple battery cells in the test space to form a battery module, and another portion of the force transmission elements are configured to connect the battery module to the moving part.

3. The test fixture as described in claim 2, characterized in that, The multiple battery cells within the test space have multiple sides extending along the first direction; Multiple force transmission elements are disposed on at least two of the sides.

4. The test fixture as described in claim 3, characterized in that, The plurality of said sides include two opposing side surfaces and opposing bottom and top surfaces; The surface where the terminal post of the battery cell is located is defined as the top side surface; The force transmission component configured to connect multiple battery cells in the test space into a battery module is a first force transmission component, and the first force transmission component is at least disposed on the bottom side surface. The force transmission member configured to connect the battery module and the movable part is a second force transmission member, and the second force transmission member is disposed on the side surface.

5. The test fixture as described in claim 4, characterized in that, The first force transmission member is configured as a base support, which is slidably connected to at least a portion of the connecting member; The test space contains multiple battery cells located on the base.

6. The test fixture as described in claim 5, characterized in that, The base includes a base plate and two connecting blocks disposed on the base plate. The two connecting blocks extend along the first direction and are arranged side by side along the second direction, with the first direction and the second direction intersecting perpendicularly. A receiving groove is defined between the base plate and the two connecting blocks, and multiple battery cells of the test space are disposed in the receiving groove; Each of the connecting blocks is threaded through at least one of the connecting members.

7. The test fixture as described in claim 5, characterized in that, The number of base supports is multiple, and the multiple base supports are arranged sequentially along the first direction.

8. The test fixture as described in claim 4, characterized in that, The second force transmission component is configured as a side plate, which is connected to the movable component; The side plate is configured to connect to multiple battery cells within the test space.

9. The test fixture as described in any one of claims 1 to 8, characterized in that, The second force detection component includes a support plate and a second force detection element; The abutment plate is disposed in the test space and is configured to abut against the battery module. The second force detection element is disposed between the abutment plate and the movable element.

10. The test fixture as described in claim 9, characterized in that, The abutment plate is slidably connected to at least a portion of the connector.

11. The test fixture as described in claim 10, characterized in that, The movable component is configured as a movable plate, and a plurality of the connecting components are respectively inserted through the movable component; some of the connecting components are inserted through the abutment plate; the first force detection component is installed on the first end plate, and the second force detection component is installed on the movable component.

12. The test fixture as described in claim 9, characterized in that, The first end plate is a rigid component, and / or the abutment plate is a rigid component.

13. The test fixture as described in claim 12, characterized in that, The thickness of the movable part along the first direction is not less than 30mm; And / or, the thickness of the abutment plate along the first direction is not less than 30 mm; And / or, the thickness of the first end plate along the first direction is not less than 30 mm; And / or, the thickness of the second end plate along the first direction is not less than 10 mm and not more than 20 mm; And / or, the connector is configured as a rod with an outer diameter of not less than 10 mm.

14. The test fixture as described in any one of claims 1 to 8, characterized in that, The first end plate and the second end plate each have a first end and a second end that are opposite each other along a second direction, and the first direction and the second direction intersect perpendicularly. The first end of the first end plate and the first end of the second end plate are connected by at least two of the connectors, and the second end of the first end plate and the second end of the second end plate are connected by at least two of the connectors.

15. The test fixture as described in claim 14, characterized in that, The connector is configured as a rod, having a first end and a second end opposite to each other along the first direction; the first end of the connector is provided with a first connecting hole, and the second end of the connector is provided with a second connecting hole; The test fixture also includes a plurality of fasteners, some of which pass through the first end plate and are connected to the first connecting hole; the other portion of the fasteners pass through the second end plate and are connected to the second connecting hole.

16. A testing device, characterized in that, include: The test fixture as described in any one of claims 1 to 15; A charging and discharging device configured to electrically connect multiple battery cells within the test space; as well as A data acquisition device configured to be electrically connected to the first force detection component and the second force detection component.

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