Battery expansion test fixture and test system

Abstract

The utility model relates to a battery expansion test fixture and a test system, a battery cell accommodating assembly in the fixture accommodates a to-be-tested battery cell module, the to-be-tested battery cell module comprises a first side surface, and the first side surface is provided with an end plate fitting area; the first inner wall of the battery cell accommodating assembly is provided with a first mounting area; a first base plate with the same size as the end plate fitting area is mounted in the first mounting area, so that the first base plate fits and covers the end plate fitting area of the to-be-tested cell module; the tightness adjusting mechanism adjusts the accommodating space of the battery cell accommodating assembly so as to apply or release pressure to the to-be-tested battery cell module, so that the structure of the end plate can be simulated through the first base plate, and the to-be-tested battery cell module is applied or released through the tightness adjusting mechanism. The expansion force of the end plate fitting area of the to-be-tested cell module under different coverage areas is tested, the expansion cycle performance of the end plate fitting area of the to-be-tested cell module under different coverage areas is tested, and the battery expansion force test universality and test reliability are improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery expansion test fixture and a test system. Background Art

[0002] A battery module usually includes two end plates and several single cells, and each single cell is arranged between the two end plates. With the development of battery technology, the types of battery modules (or battery packs) are becoming more and more diverse, and the structures of the end plates are also becoming more and more diverse. For example, for different battery product applications, the area ratio of the side of the single cell covered by the end plate is different, so the expansion force test requirements for the battery module (or battery pack) are also different. The expansion force of the single cell may cause certain damage to the structural components such as the end plate of the battery module (or battery pack). In order to ensure that the structure of the battery module (or battery pack) will not fail due to battery expansion throughout its life cycle, it is particularly important to study the expansion force generated by the single cells in the battery module (or battery pack).

[0003] In the related art, the existing battery expansion force testing tooling usually performs expansion force testing on the battery cell in a manner where the end plate fully covers the side of the single battery cell, and the test has poor versatility and low reliability. Utility Model Content

[0004] Based on this, it is necessary to provide a battery expansion test fixture and test system that can improve the test versatility of the battery expansion force test fixture and have high test reliability in order to address the problems existing in the above-mentioned existing battery expansion force test tooling.

[0005] In a first aspect, the present application provides a battery expansion test fixture, comprising:

[0006] A cell accommodating assembly, the cell accommodating assembly is configured to accommodate a cell module to be tested, the cell module to be tested includes a first side surface, the first side surface is provided with an end plate fitting area; a first inner wall of the cell accommodating assembly is provided with a first mounting area; the first mounting area is configured to install a first pad having the same size as the end plate fitting area, so that the first pad fits and covers the end plate fitting area of ​​the cell module to be tested;

[0007] The tension adjustment mechanism is configured to adjust the accommodation space of the battery cell accommodation assembly to apply pressure or release pressure on the battery cell module to be tested.

[0008] In one embodiment, the battery cell module to be tested also includes a second side surface opposite to the first side surface; the second inner wall of the battery cell containing assembly is provided with a second installation area; the second installation area is configured to install a second pad so that the second pad fits and covers the second side surface of the battery cell module to be tested.

[0009] In one embodiment, the battery cell containing assembly includes a first fixing plate and a clamping plate, and the battery cell module to be tested is arranged between the first fixing plate and the clamping plate;

[0010] The first mounting area is arranged on the first fixing plate, and the second mounting area is arranged on the clamping plate;

[0011] Alternatively, the first mounting area is arranged on the clamping plate, and the second mounting area is arranged on the first fixing plate.

[0012] In one embodiment, the tension adjustment mechanism includes a transmission rod and a sliding rod group; the clamping plate is provided with a first through hole group;

[0013] The sliding rod group passes through the first through hole group of the clamping plate, and the first end of the sliding rod group is arranged on the first fixing plate;

[0014] The transmission rod is used to apply pressure to or release pressure on the clamping plate so that the clamping plate moves axially along the sliding rod group.

[0015] In one embodiment, the tension adjustment mechanism further includes a second fixing plate; the second fixing plate is provided with a second through hole;

[0016] The second end of the sliding rod assembly is disposed on the second fixed plate;

[0017] The transmission rod passes through the second through hole to apply pressure to or release pressure on the clamping plate.

[0018] In one embodiment, a pressing plate is further included; the pressing plate is provided with a third through hole group and a third mounting area;

[0019] The sliding rod group passes through the third through hole group of the pressing plate, and the pressing plate is located between the clamping plate and the second fixing plate;

[0020] The third mounting area is configured to mount a pressure sensor, and the pressure sensor is located between the pressure plate and the clamping plate.

[0021] In one embodiment, a connecting block is provided at the first end of the transmission rod, and an adjusting rod is provided at the second end of the transmission rod;

[0022] The connecting block is used to abut against the pressure plate.

[0023] In one embodiment, the tension adjustment mechanism further includes an adjustment plate; the first end of the adjustment plate is arranged on the first fixed plate, and the second end of the adjustment plate is arranged on the second fixed plate;

[0024] The adjusting plate is provided with a slide rail area, the clamping plate is provided with a first slide groove, and the pressing plate is provided with a second slide groove;

[0025] The first slide groove of the clamping plate is used for moving along the slide rail area, and the second slide groove of the clamping plate is used for moving along the slide rail area.

[0026] In one of the embodiments, the adjustment plate is further provided with a boss;

[0027] The boss is used to support the third side surface of the battery cell module to be tested.

[0028] In a second aspect, the present application provides a test system, including a control device and a battery expansion test fixture as described above; the battery expansion test fixture is used to set a battery cell module to be tested;

[0029] The control device is connected to the battery cell module to be tested.

[0030] One of the above technical solutions has the following advantages and beneficial effects:

[0031] The above-mentioned battery expansion test fixture includes a battery cell accommodating assembly and a tension adjustment mechanism. The battery cell accommodating assembly is configured to accommodate a battery cell module to be tested. The battery cell module to be tested includes a first side surface, and the first side surface is provided with an end plate fitting area; the first inner wall of the battery cell accommodating assembly is provided with a first installation area; the first installation area is configured to install a first pad with the same size as the end plate fitting area, so that the first pad fits and covers the end plate fitting area of ​​the battery cell module to be tested; the tension adjustment mechanism is configured to adjust the accommodation space of the battery cell accommodating assembly to apply pressure or release pressure on the battery cell module to be tested, thereby realizing the expansion force test of the battery cell module to be tested. The present application designs the size of the first pad according to the end plate fitting area of ​​the battery cell module to be tested, so that the size of the first pad is the same as the size of the end plate fitting area, and the first pad is set in the first installation area of ​​the first inner wall of the battery cell containing assembly to simulate the structure of the end plate through the first pad, and the battery cell module to be tested is pressurized or relieved through the tension adjustment mechanism, so as to test the expansion force of the end plate fitting area of ​​the battery cell module to be tested under different coverage areas, thereby realizing the expansion cycle performance test of the end plate fitting area of ​​the battery cell module to be tested under different coverage areas, thereby improving the versatility and test reliability of the battery expansion force test. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the structure of the battery expansion test fixture from a first perspective in an embodiment of the present application;

[0033] Figure 2 This is a schematic diagram of the structure of the battery expansion test fixture from a second perspective in an embodiment of the present application;

[0034] Figure 3 This is a schematic diagram of the exploded structure of the battery expansion test fixture from a first perspective in an embodiment of the present application;

[0035] Figure 4 This is a schematic diagram of the exploded structure from a second perspective of the battery expansion test fixture in an embodiment of the present application.

[0036] Reference numerals:

[0037] 100, battery cell containing assembly; 106, first fixed plate; 108, clamping plate; 1082, first through hole group; 1084, first slide groove; 200, tension adjustment mechanism; 202, transmission rod; 204, connecting block; 206, adjustment rod; 208, sliding rod group; 212, second fixed plate; 2122, second through hole; 214, adjustment plate; 2142, slide rail area; 2144, boss; 300, first pad; 400, second pad; 500, pressure plate; 502, third through hole group; 506, second slide groove; 600, battery cell module to be tested. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0039] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover inclusions that are not listed. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0040] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0041] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0042] In addition, the term "plurality" shall mean two or more.

[0043] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0044] In one embodiment, Figure 1 As shown, a battery expansion test fixture is provided, including a battery cell accommodating assembly 100 and a tension adjustment mechanism 200; the battery cell accommodating assembly 100 is configured to accommodate a battery cell module 600 to be tested, and the battery cell module 600 to be tested includes a first side surface, and the first side surface is provided with an end plate fitting area; the first inner wall of the battery cell accommodating assembly 100 is provided with a first installation area; the first installation area is configured to install a first pad 300 with the same size as the end plate fitting area, so that the first pad 300 fits and covers the end plate fitting area of ​​the battery cell module 600 to be tested; the tension adjustment mechanism 200 is configured to adjust the accommodation space of the battery cell accommodating assembly 100 to apply pressure or release pressure on the battery cell module 600 to be tested.

[0045] The cell module 600 to be tested may be composed of one single cell. In another example, the cell module 600 to be tested may also be composed of multiple single cells. For example, when the cell module 600 to be tested includes multiple single cells, the multiple single cells are arranged in a column and multiple rows. That is, the battery expansion test fixture of the present application can perform an expansion force cycle test on a single cell, and can also enhance the single cell according to actual needs, and perform an expansion force cycle test on a cell module composed of multiple single cells.

[0046] When the cell module 600 to be tested includes one single cell, the first side of the cell module 600 to be tested refers to the side of the single cell used to fit the end plate. Exemplarily, the single cell can be a lithium-ion cell, and the single cell has a square structure (e.g., a rectangular structure), then the side of the single cell used to fit the end plate is the side with a larger area. When the cell module 600 to be tested includes multiple single cells, the first side of the cell module 600 to be tested refers to the side of the first single cell in a column and multiple rows arranged to fit the end plate or the side of the last single cell used to fit the end plate.

[0047] The end plate fitting area of ​​the first side is used to fit with the end plate, that is, the size of the end plate fitting area is the same as the size of the fitting surface of the end plate, so that the end plate can cover the end plate fitting area. It should be noted that the end plates used by the different models or types of battery cell modules 600 to be tested are different, that is, the shapes and sizes of the end plate fitting areas set for the different models or types of battery cell modules 600 to be tested are different. Exemplarily, according to the actual product application scenario, the area ratio of the end plate covering the first side can be between 60% and 100%, and then the area ratio of the end plate fitting area to the first side is set to between 60% and 100, and the fitting position of the end plate is the same as the setting position of the end plate fitting area.

[0048] The battery cell containing assembly 100 may be provided with an adjustable containing cavity, which is used to contain the battery cell module 600 to be tested. For example, when the space of the containing cavity is reduced, the battery cell module 600 to be tested can be clamped to achieve pressure on the battery cell module 600 to be tested; when the space of the containing cavity is increased, the battery cell module 600 to be tested can be loosened to achieve pressure relief on the battery cell module 600 to be tested, so that the user can take out the battery cell module 600 to be tested.

[0049] The first inner wall of the battery cell containing assembly 100 is provided with a first installation area, and the first installation area can be used to install and set the first pad 300, and the size of the first pad 300 is the same as the size of the end plate fitting area. Exemplarily, a plurality of first pads 300 of different sizes can be preset, and in the actual test process, the first pad 300 of the corresponding size can be selected according to the size of the end plate fitting area. In another example, in the actual test process, the initial first pad 300 can also be cut according to the size of the end plate fitting area, so as to obtain a first pad 300 of the same size as the end plate fitting area.

[0050] Exemplarily, the first pad 300 can be set in the first installation area by bonding or screwing. For example, a plurality of first bolt holes can be set in the first installation area, and the first pad 300 can be set with a plurality of second bolt holes, and then the first pad 300 can be locked and fixed in the first installation area by passing bolts through the corresponding first bolt holes and second bolt holes. By setting the first pad 300 in the first installation area, the battery cell module 600 to be tested is set in the battery cell containing assembly 100, and pressure is applied to the battery cell module 600 to be tested, so that the first pad 300 fits and covers the end plate fitting area of ​​the battery cell module 600 to be tested, and then the expansion force test of the battery cell module 600 to be tested can be realized by simulating the end plate through the first pad 300, thereby improving the reliability of the test.

[0051] The tension adjustment mechanism 200 can be used to adjust the accommodating space of the battery cell accommodating component 100 to increase or decrease. The tension adjustment mechanism 200 is mechanically connected to the battery cell accommodating component 100. For example, when the tension adjustment mechanism 200 adjusts the accommodating space of the battery cell accommodating component 100 to decrease, pressure is applied to the battery cell module 600 to be tested, and then the expansion force cycle test can be performed on the battery cell module 600 to be tested; when the tension adjustment mechanism 200 adjusts the accommodating space of the battery cell accommodating component 100 to increase, pressure is released on the battery cell module 600 to be tested, and then the battery cell module 600 to be tested is conveniently removed from the battery cell accommodating component 100. It should be noted that the tension adjustment mechanism 200 can be manually operated to achieve pressure application or pressure relief on the battery cell module 600 to be tested; and the tension adjustment mechanism 200 can also be automatically operated (such as a motor drive method) to achieve pressure application or pressure relief on the battery cell module 600 to be tested.

[0052] In the above-mentioned embodiment, the battery cell module 600 to be tested is arranged in the battery cell containing assembly 100, and the first inner wall of the battery cell containing assembly 100 is provided with a first installation area; the first installation area is used to install a first pad 300 with the same size as the end plate fitting area of ​​the battery cell module 600 to be tested, so that the first pad 300 fits and covers the end plate fitting area of ​​the battery cell module 600 to be tested; the tension adjustment mechanism 200 adjusts the accommodation space of the battery cell containing assembly 100 to apply pressure or release pressure on the battery cell module 600 to be tested, thereby realizing the expansion force test of the battery cell module 600 to be tested. The present application designs the size of the first pad 300 according to the end plate fitting area of ​​the battery cell module 600 to be tested, so that the size of the first pad 300 is the same as the size of the end plate fitting area, and the first pad 300 is set in the first installation area of ​​the first inner wall of the battery cell containing assembly 100, so as to simulate the structure of the end plate through the first pad 300, and apply pressure or release pressure on the battery cell module 600 to be tested through the tension adjustment mechanism 200, so as to test the expansion force of the end plate fitting area of ​​the battery cell module 600 to be tested under different coverage areas, thereby realizing the expansion cycle performance test of the end plate fitting area of ​​the battery cell module 600 to be tested under different coverage areas, thereby improving the versatility and test reliability of the battery expansion force test.

[0053] In one embodiment, Figure 2 As shown, the battery cell module 600 to be tested also includes a second side opposite to the first side; the second inner wall of the battery cell containing assembly 100 is provided with a second installation area; the second installation area is configured to install a second pad 400 so that the second pad 400 fits and covers the second side of the battery cell module 600 to be tested.

[0054] The second side of the cell module 600 to be tested corresponds to the first side of the cell module 600 to be tested. For example, if the cell module 600 to be tested is a square structure, the shape and size of the second side are the same as the first side. In an exemplary pipeline, the cell module 600 to be tested includes a plurality of single cells. The first side of the first single cell is used to fit the end plate. The second side of the first single cell is arranged adjacent to the first side of the second single cell. The second side of the second single cell is arranged adjacent to the first side of the third single cell, and so on. It should be noted that an isolation pad may be arranged between two single cells.

[0055] The second inner wall of the battery cell containing assembly 100 is opposite to the first inner wall, and the second inner wall of the battery cell containing assembly 100 is provided with a second installation area; the second installation area can be used to install and set the second pad 400. In one example, when the battery cell module 600 to be tested includes a single battery cell, the size of the second pad 400 is the same as the size of the second side of the battery cell module 600 to be tested. For example, a plurality of second pads 400 of different sizes can be preset, and in the actual test process, the second pad 400 of the corresponding size can be selected according to the size of the battery cell module 600 to be tested. For another example, in the actual test process, the initial second pad 400 can also be cut according to the size of the second side of the battery cell module 600 to be tested, so as to obtain a second pad 400 with the same size as the second side of the battery cell module 600 to be tested.

[0056] In another example, when the cell module 600 to be tested includes multiple cell modules, the second side surface of the cell module 600 to be tested can be used to fit another end plate, so that the size of the second pad 400 is the same as the size of the area of ​​the second side surface of the cell module 600 to be tested that fits the end plate.

[0057] Exemplarily, the second pad 400 can be arranged in the second installation area by bonding or screwing. For example, a plurality of third bolt holes can be arranged in the second installation area, and a plurality of fourth bolt holes can be arranged in the second pad 400, and then bolts can be passed through the corresponding third bolt holes and fourth bolt holes to lock and fix the second pad 400 in the second installation area. By setting the second pad 400 in the second installation area, the first pad 300 in the first installation area, and the cell module 600 to be tested in the cell containing assembly 100, pressure is applied to the cell module 600 to make the second pad 400 fit and cover the second side of the cell module 600 to be tested, and the first pad 300 fit and cover the end plate fitting area of ​​the cell module 600 to be tested, so that the expansion force test of the cell module 600 to be tested can be carried out by simulating the end plate through the first pad 300 and simulating the adjacent single cell through the second pad 400, thereby improving the reliability of the test; by applying pressure or releasing pressure on the cell module 600 to be tested through the tension adjustment mechanism 200, the expansion force of the end plate fitting area of ​​the cell module 600 to be tested under different coverage areas can be tested, so as to realize the expansion cycle performance test of the end plate fitting area of ​​the cell module 600 to be tested under different coverage areas, thereby improving the versatility of the battery expansion force test.

[0058] In one embodiment, Figure 2 and Figure 3 As shown, the battery cell containing assembly 100 includes a first fixing plate 106 and a clamping plate 108 , and the battery cell module 600 to be tested is arranged between the first fixing plate 106 and the clamping plate 108 ; the first installation area is arranged on the first fixing plate 106 , and the second installation area is arranged on the clamping plate 108 .

[0059] The first fixing plate 106 may be a metal plate, and the clamping plate 108 may be a metal plate. The clamping plate 108 is a movable plate, and the clamping plate 108 can move closer to or away from the first fixing plate 106 under the action of an external force. Exemplarily, the first fixing plate 106 and the clamping plate 108 are arranged parallel to each other.

[0060] The first fixing plate 106 is provided with a first installation area, in which a first pad 300 is installed, and the clamping plate 108 is provided with a second installation area, in which a second pad 400 is installed. By arranging the cell module 600 to be tested between the first fixing plate 106 and the clamping plate 108, that is, the cell module 600 to be tested is located between the first pad 300 and the second pad 400, when the tension adjustment mechanism 200 applies pressure to the cell module 600 to be tested, the clamping plate 108 drives the second pad 400 to squeeze the cell module 600 to be tested, so that the first pad 300 and the second pad 400 are respectively abutted against the cell module 600 to be tested, so that the first pad 300 can simulate the end plate, and the second pad 400 can simulate the adjacent single cell. , an expansion force test is performed on the battery cell module 600 to be tested, thereby improving the reliability of the test; the battery cell module 600 to be tested is depressurized by the tension adjustment mechanism 200, and the clamping plate 108 can move away from the battery cell module 600 to be tested, so that the pressure of the first pad 300 and the second pad 400 on the battery cell module 600 to be tested is released, so that the battery cell module 600 to be tested is separated from the first pad 300 and the second pad 400 respectively, thereby facilitating the removal of the battery cell module 600 to be tested, thereby being able to test the expansion force of the end plate fitting area of ​​the battery cell module 600 to be tested under different coverage areas, thereby realizing the expansion cycle performance test of the end plate fitting area of ​​the battery cell module 600 to be tested under different coverage areas, thereby improving the versatility and reliability of the battery expansion force test.

[0061] In one example, the first installation area is set on the clamping plate 108, and the second installation area is set on the first fixed plate 106. The first installation area is installed with the first pad 300, and the second installation area is installed with the second pad 400. By setting the cell module 600 to be tested between the first fixed plate 106 and the clamping plate 108, that is, the cell module 600 to be tested is located between the first pad 300 and the second pad 400, when the tension adjustment mechanism 200 applies pressure to the cell module 600 to be tested, the clamping plate 108 drives the first pad 300 to squeeze the cell module 600 to be tested, so that the first pad 300 and the second pad 400 are respectively abutted against the cell module 600 to be tested, so that the test cell module 600 can be realized. The expansion force test of the cell module 600 to be tested is performed by simulating the end plate through the first pad 300 and simulating the adjacent single cell through the second pad 400, thereby improving the reliability of the test; the pressure of the cell module 600 to be tested is released through the tension adjustment mechanism 200, and the clamping plate 108 can move away from the cell module 600 to be tested, so that the pressure of the first pad 300 and the second pad 400 on the cell module 600 to be tested is released, so that the cell module 600 to be tested is separated from the first pad 300 and the second pad 400 respectively, thereby facilitating the removal of the cell module 600 to be tested.

[0062] In one embodiment, Figure 2 and Figure 3 As shown, the tension adjustment mechanism 200 includes a transmission rod 202 and a sliding rod group 208; the clamp plate 108 is provided with a first through hole group 1082; the sliding rod group 208 passes through the first through hole group 1082 of the clamp plate 108, and the first end of the sliding rod group 208 is provided on the first fixed plate 106; the transmission rod 202 is used to apply pressure to or release pressure on the clamp plate 108 so that the clamp plate 108 moves axially along the sliding rod group 208.

[0063] The transmission rod 202 may be a screw rod, and the clamping plate 108 may be pressed or relieved by rotating the transmission rod 202. For example, when the transmission rod 202 is rotated clockwise, the clamping plate 108 is pressed, so that the clamping plate 108 drives the first pad 300 or the second pad 400 to abut against the battery cell module 600 to be tested, thereby applying pressure to the battery cell module 600 to be tested; when the transmission rod 202 is rotated counterclockwise, the clamping plate 108 is relieved of pressure, so that the battery cell module 600 to be tested is separated from the first pad 300 and the second pad 400, thereby facilitating the removal of the battery cell module 600 to be tested.

[0064] The sliding rod group 208 may be composed of a plurality of sliding rods, and the first through hole group 1082 may be composed of a plurality of first through holes, wherein the number of the sliding rods is the same as the number of the first through holes. For example, the splint 108 can be a square splint 108, the sliding rod group 208 includes 4 sliding rods, the first through hole group 1082 includes 4 first through holes, the 4 first through holes are distributed at the 4 corners of the splint 108, the 4 sliding rods pass through the 4 first through holes on the splint 108 accordingly, the first end of the sliding rod can be set on the first fixed plate 106 by welding or screwing, and each sliding rod is perpendicular to the first fixed plate 106. When the rotating transmission rod 202 applies pressure to the splint 108, the splint 108 moves axially along the sliding rod group 208, thereby driving the first pad 300 or the second pad 400 to squeeze toward the battery cell module 600 to be tested, so that the first pad 300 and the second pad 400 are respectively abutted against the battery cell module 600 to be tested, so that the first pad 300 simulates the end plate, and the second pad 400 simulates the adjacent single battery cell. The expansion force test of the battery cell module 600 to be tested is performed to improve the reliability of the test; when the rotating transmission rod 202 releases the pressure on the clamping plate 108, the clamping plate 108 moves axially along the sliding rod group 208, so that the clamping plate 108 moves away from the battery cell module 600 to be tested, thereby releasing the pressure of the first pad 300 and the second pad 400 on the battery cell module 600 to be tested, so that the battery cell module 600 to be tested is separated from the first pad 300 and the second pad 400 respectively, thereby facilitating the removal of the battery cell module 600 to be tested, and the clamping plate 108 is guided to move axially by the sliding rod group 208, so that the first fixed plate 106 and the clamping plate 108 can be kept parallel to each other. When the transmission rod 202 applies pressure to the clamping plate 108, the first pad 300 and the second pad 400 can tightly abut against the battery cell module 600 to be tested, thereby further improving the reliability of the expansion force test.

[0065] In one embodiment, Figure 3 As shown, the tension adjustment mechanism 200 further includes a second fixing plate 212 ; the second fixing plate 212 is provided with a second through hole 2122 ; the second end of the sliding rod group 208 is provided on the second fixing plate 212 ; the transmission rod 202 passes through the second through hole 2122 to apply pressure to or release pressure on the clamping plate 108 .

[0066] The second fixing plate 212 may be a metal plate, and the second end of the sliding rod group 208 may be disposed on the second fixing plate 212 by welding or screwing, so as to achieve mutual fixation among the first fixing plate 106 , the second fixing plate 212 and the sliding rod group 208 .

[0067] The second through hole 2122 may be provided with an internal thread, and the rod body of the transmission rod 202 may be provided with an external thread. The transmission rod 202 passes through the second through hole 2122, and the external thread of the transmission rod 202 and the internal thread of the second through hole 2122 are connected with each other, and the clamping plate 108 is pressed or relieved by rotating the transmission rod 202. For example, rotating the transmission rod 202 clockwise can pressurize the clamping plate 108, thereby applying pressure to the battery cell module 600 to be tested; rotating the transmission rod 202 counterclockwise can relieve pressure on the clamping plate 108, thereby releasing pressure on the battery cell module 600 to be tested.

[0068] In one embodiment, Figure 2 and Figure 3 As shown, the battery expansion test fixture also includes a pressing plate 500; the pressing plate 500 is provided with a third through hole group 502 and a third mounting area; the sliding rod group 208 passes through the third through hole group 502 of the pressing plate 500, and the pressing plate 500 is located between the clamping plate 108 and the second fixed plate 212; the third mounting area is configured to install a pressure sensor, and the pressure sensor is located between the pressing plate 500 and the clamping plate 108.

[0069] Among them, the third through hole group 502 can be composed of a plurality of third through hole groups 502, and the number of the third through holes is the same as the number of the sliding rods. The pressure plate 500 can be a plate-like structure made of metal. The third installation area can be used to install and set the pressure sensor, and the pressure sensor can be set in the third installation area by bonding or screwing. For example, a plurality of fifth bolt holes can be set in the third installation area, and the pressure sensor can be set with a plurality of sixth bolt holes, and then bolts can be passed through the corresponding fifth bolt holes and sixth bolt holes to achieve locking and fixing the pressure sensor in the third installation area, and the pressure sensor is located between the pressure plate 500 and the clamping plate 108.

[0070] Exemplarily, the pressing plate 500 may be a square pressing plate 500, the sliding rod group 208 includes four sliding rods, the third through hole group 502 includes four third through holes, and the four third through holes are distributed at the four corners of the pressing plate 500. The four sliding rods pass through the four first through holes on the clamping plate 108 and the four third through holes on the pressing plate 500 respectively. When the rotating transmission rod 202 applies pressure to the pressing plate 500, the pressing plate 500 moves axially along the sliding rod group 208, and then the pressing plate 500 drives the pressure sensor to move, so that the pressure sensor abuts against the clamping plate 108. When the clamping plate 108 is under stress, it drives the first pad 300 or the second pad 400 to squeeze the battery cell module 600 to be tested, so that the first pad 300 and the second pad 400 are respectively abutted against the battery cell module 600 to be tested. The first pad 300 simulates the end plate, and the second pad 400 simulates the adjacent single battery cell. The stress state of the battery cell module 600 to be tested is monitored in real time by the pressure sensor, so as to realize the expansion cycle performance test of the end plate fitting area of ​​the battery cell module 600 to be tested under different coverage areas, thereby improving the versatility and test reliability of the battery expansion force test.

[0071] In one embodiment, Figure 4 As shown, a connecting block 204 is disposed at the first end of the transmission rod 202 , and an adjusting rod 206 is disposed at the second end of the transmission rod 202 ; the connecting block 204 is used to abut against the pressing plate 500 .

[0072] The connecting block 204 is movably connected to the first end of the transmission rod 202. For example, the first surface of the connecting block 204 is used to fit the pressing plate 500. The second surface of the connecting block 204 may be provided with a receiving groove. The first end of the transmission rod 202 may be provided with a bearing, and the bearing is received in the receiving groove of the connecting block 204. When the transmission rod 202 is rotated, the bearing is driven to rotate, and the connecting block 204 is not driven to rotate, so that the connecting block 204 can only move along the axial direction of the transmission rod 202. By providing the connecting block 204 at the first end of the transmission rod 202, the contact area with the pressing plate 500 can be increased, so that when the transmission rod 202 is in a pressure state, the pressing plate 500 is evenly stressed, and the pressing plate 500 is prevented from tilting and causing jamming.

[0073] The adjustment rod 206 can be a pry bar, and the adjustment rod 206 can be vertically set at the second end of the transmission rod 202, so as to facilitate manual operation by the user or automatic mechanical operation of the adjustment rod 206, so that the transmission rod 202 rotates, thereby applying pressure or releasing pressure on the battery cell module 600 to be tested.

[0074] In one embodiment, Figure 2 and Figure 3As shown, the tension adjustment mechanism 200 also includes an adjustment plate 214; the first end of the adjustment plate 214 is arranged on the first fixed plate 106, and the second end of the adjustment plate 214 is arranged on the second fixed plate 212; the adjustment plate 214 is provided with a slide rail area 2142, the clamping plate 108 is provided with a first slide groove 1084, and the pressure plate 500 is provided with a second slide groove 506; the first slide groove 1084 of the clamping plate 108 is used to move along the slide rail area 2142, and the second slide groove 506 of the clamping plate 108 is used to move along the slide rail area 2142.

[0075] The adjustment plate 214 may be a plate-shaped structure made of metal. The first end of the adjustment plate 214 may be arranged on the first fixing plate 106 by screwing or welding, and the second end of the adjustment plate 214 may be arranged on the second fixing plate 212 by screwing or welding. Exemplarily, the first fixing plate 106 is perpendicular to the adjustment plate 214, and the second fixing plate 212 is perpendicular to the adjustment plate 214.

[0076] The adjusting plate 214 is provided with a slide rail area 2142, the first slide groove 1084 of the clamping plate 108 is provided adjacent to the slide rail area 2142, and the second slide groove 506 of the pressing plate 500 is provided adjacent to the slide rail area 2142. When the rotating transmission rod 202 applies pressure to the pressing plate 500, the pressing plate 500 moves axially along the sliding rod group 208, and at the same time, the second slide groove 506 of the pressing plate 500 moves along the slide rail area 2142 of the adjusting plate 214, and then the pressing plate 500 drives the pressure sensor to move, so that the pressure sensor abuts against the adjusting plate 214. On the clamping plate 108, the clamping plate 108 moves axially along the sliding rod group 208 under stress, and at the same time, the first sliding groove 1084 of the clamping plate 108 moves along the sliding rail area 2142 of the adjustment plate 214, thereby driving the first pad 300 or the second pad 400 to be squeezed toward the battery cell module 600 to be tested, so that the first pad 300 and the second pad 400 are respectively abutted against the battery cell module 600 to be tested, thereby realizing the expansion cycle performance test of the end plate fitting area of ​​the battery cell module 600 to be tested under different coverage areas. When the battery cell module 600 to be tested needs to be replaced or substituted, the pressure on the pressure plate 500 is released by rotating the transmission rod 202, and the pressure plate 500 moves axially along the sliding rod group 208, and at the same time, the second slide groove 506 of the pressure plate 500 moves along the slide rail area 2142 of the adjustment plate 214. In addition, the clamping plate 108 can move axially along the sliding rod group 208 in the pressure relief state, and at the same time, the first slide groove 1084 of the clamping plate 108 moves along the slide rail area 2142 of the adjustment plate 214, so that the battery cell module 600 to be tested can be taken out, and the pressure plate 500 and the clamping plate 108 are aligned to prevent the pressure plate 500 and the clamping plate 108 from tilting, thereby further improving the versatility and test reliability of the battery expansion force test.

[0077] In one embodiment, Figure 3 and Figure 4As shown, the adjustment plate 214 is further provided with a boss 2144 ; the boss 2144 is used to support the third side surface of the battery cell module 600 to be tested.

[0078] Among them, the third side of the battery cell module 600 to be tested is adjacent to the first side and the second side of the battery cell module 600 to be tested, respectively, and the boss 2144 of the adjustment plate 214 can be used to support the third side of the battery cell module 600 to be tested, so as to support the battery cell module 600 as a whole, so that the first pad 300 and the second pad 400 can abut against the battery cell module 600 to be tested, thereby improving the operational convenience of the expansion force test of the battery cell module 600 to be tested.

[0079] In one embodiment, a test system is also provided, including a control device and a battery expansion test fixture as described above; the battery expansion test fixture is used to set the battery cell module to be tested; and the control device is connected to the battery cell module to be tested.

[0080] The control device can be used to control the charge and discharge of the battery module to be tested. In another example, the control device is also connected to a pressure sensor, which can be used to collect pressure signals of the battery module to be tested. The control device can obtain the pressure signals collected by the pressure sensor to monitor the expansion force of the battery module to be tested.

[0081] For the specific description of the battery swelling test fixture, reference may be made to the specific description of the battery swelling test fixture in the above embodiment, which will not be repeated here.

[0082] By arranging the battery cell module to be tested in the battery cell containing assembly, the control device is connected to the battery cell module to be tested, and the first inner wall of the battery cell containing assembly is provided with a first installation area; the first installation area is used to install a first pad with the same size as the end plate fitting area of ​​the battery cell module to be tested, so that the first pad fits and covers the end plate fitting area of ​​the battery cell module to be tested; the tension adjustment mechanism adjusts the accommodation space of the battery cell containing assembly to apply pressure or release pressure on the battery cell module to be tested, thereby realizing the expansion force test of the battery cell module to be tested.

[0083] In the above embodiment, the size of the first pad is designed according to the end plate fitting area of ​​the battery cell module to be tested, so that the size of the first pad is the same as the size of the end plate fitting area, and the first pad is set in the first installation area of ​​the first inner wall of the battery cell containing assembly to simulate the structure of the end plate through the first pad, and the battery cell module to be tested is pressurized or relieved through the tension adjustment mechanism, so that the expansion force of the end plate fitting area of ​​the battery cell module to be tested under different coverage areas can be tested, and the expansion cycle performance test of the end plate fitting area of ​​the battery cell module to be tested under different coverage areas can be realized, thereby improving the versatility and test reliability of the battery expansion force test.

[0084] It should be noted that the test system may also include components such as a display, and the specific test system may include more components than those described in the above embodiments, or combine certain components, or have a different arrangement of components.

[0085] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0086] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A battery expansion test fixture, characterized in that: include: A cell accommodating assembly, the cell accommodating assembly is configured to accommodate a cell module to be tested, the cell module to be tested comprises a first side surface, the first side surface is provided with an end plate fitting area; a first inner wall of the cell accommodating assembly is provided with a first mounting area; the first mounting area is configured to install a first pad having the same size as the end plate fitting area, so that the first pad fits and covers the end plate fitting area of ​​the cell module to be tested; The tension adjustment mechanism is configured to adjust the accommodation space of the battery cell accommodation assembly to apply pressure to or release pressure on the battery cell module to be tested.

2. The battery expansion test fixture according to claim 1, characterized in that: The battery cell module to be tested also includes a second side surface opposite to the first side surface; the second inner wall of the battery cell containing assembly is provided with a second installation area; the second installation area is configured to install a second pad so that the second pad fits and covers the second side surface of the battery cell module to be tested.

3. The battery expansion test fixture according to claim 2, characterized in that: The battery cell accommodating assembly comprises a first fixing plate and a clamping plate, and the battery cell module to be tested is arranged between the first fixing plate and the clamping plate; The first mounting area is arranged on the first fixing plate, and the second mounting area is arranged on the clamping plate; Alternatively, the first installation area is arranged on the clamping plate, and the second installation area is arranged on the first fixing plate.

4. The battery expansion test fixture according to claim 3, characterized in that: The tension adjustment mechanism includes a transmission rod and a sliding rod group; the clamping plate is provided with a first through hole group; The sliding rod group passes through the first through hole group of the clamping plate, and the first end of the sliding rod group is arranged on the first fixing plate; The transmission rod is used to apply pressure to or release pressure on the clamping plate, so that the clamping plate moves axially along the sliding rod group.

5. The battery expansion test fixture according to claim 4, characterized in that: The tension adjustment mechanism further includes a second fixing plate; the second fixing plate is provided with a second through hole; The second end of the sliding rod group is arranged on the second fixing plate; The transmission rod passes through the second through hole to apply pressure to or release pressure on the clamping plate.

6. The battery expansion test fixture according to claim 5, characterized in that: Also includes a pressing plate; the pressing plate is provided with a third through hole group and a third mounting area; The sliding rod group passes through the third through hole group of the pressing plate, and the pressing plate is located between the clamping plate and the second fixing plate; The third mounting area is configured to mount a pressure sensor, and the pressure sensor is located between the pressure plate and the clamping plate.

7. The battery expansion test fixture according to claim 6, characterized in that: A connecting block is provided at the first end of the transmission rod, and an adjusting rod is provided at the second end of the transmission rod; The connecting block is used for abutting against the pressing plate.

8. The battery expansion test fixture according to claim 6 or 7, characterized in that: The tension adjustment mechanism further includes an adjustment plate; a first end of the adjustment plate is arranged on the first fixing plate, and a second end of the adjustment plate is arranged on the second fixing plate; The adjusting plate is provided with a slide rail area, the clamping plate is provided with a first slide groove, and the pressing plate is provided with a second slide groove; The first slide groove of the clamping plate is used for moving along the slide rail area, and the second slide groove of the clamping plate is used for moving along the slide rail area.

9. The battery expansion test fixture according to claim 8, characterized in that: The adjustment plate is also provided with a boss; The boss is used to support the third side surface of the battery cell module to be tested.

10. A testing system, characterized in that: It comprises a control device and a battery expansion test fixture as claimed in any one of claims 1 to 9; the battery expansion test fixture is used to set a battery cell module to be tested; The control device is connected to the battery cell module to be tested.

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