Battery test fixture and battery test device

Abstract

The utility model provides a battery testing clamp and a battery testing device.The battery testing clamp comprises a shell, a bearing piece, a pressing plate and a driving structure, the bearing piece comprises a first connecting part, a bearing part and a second connecting part which are connected in a bent mode, and the first connecting part and the second connecting part are connected with the shell; the bearing part and the shell are spaced and form a containing gap used for containing a battery, the pressing plate is arranged in the shell, the pressing plate and the bearing part are arranged in a spaced mode, the pressing plate can move in the first direction so as to make contact with and press the battery, the first direction is perpendicular to the bearing part, and the driving structure is connected with the pressing plate. The driving structure is used for driving the pressing plate to move in the first direction or the opposite direction of the first direction so as to adjust the distance between the pressing plate and the bearing part. The driving structure can enable the pressing plate to stop at any position of the moving path of the pressing plate, the size of the gap for free expansion of the battery can be accurately reserved, the expansion force of the battery can be conveniently tested subsequently, other structural parts do not need to be replaced, and the cost of the battery test fixture can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery testing, in particular to a battery test fixture and a battery testing device. BACKGROUND

[0002] In the process of continuous charging and discharging, the thickness of the secondary battery changes, and the stress generated by the thickness of the secondary battery has a significant impact on its performance. At the same time, the volume change caused by the thickness change also greatly affects the application scenarios of the secondary battery. Therefore, during the development and testing of the secondary battery, it is of great significance to introduce a pre-tightening force that can be accurately distributed on the surface of the secondary battery and to reserve the size of the accurate free expansion gap for the design of the secondary battery and the subsequent packaging and battery pack design.

[0003] In related technologies, the battery test fixture directly clamps on the surface of the battery cell by using a rigid clamp plate to apply a pre-tightening force, and the pre-tightening force is realized by using a torque wrench to tighten the screw. This method cannot guarantee that the upper and lower clamping plates remain horizontal relative to the surface of the secondary battery being tested during the tightening process. At the same time, due to the expansion of the secondary battery, it is difficult for the traditional test fixture to determine the precise relationship between the expansion force and the thickness change. Furthermore, the torque wrench cannot guarantee the application of accurate pre-tightening force due to user's technique. The traditional constant gap test fixture uses a rigid limiting block to reserve a portion of the free expansion space for the secondary battery at the BOL stage. However, due to the difference in the initial thickness of the secondary battery, this method will produce certain errors in the test results. At the same time, for a large number of gradient experiments, this traditional test fixture needs to customize a large number of limiting devices of different sizes, which has the problems of difficult replacement, high cost, and low reusability. UTILITY MODEL CONTENT

[0004] The purpose of the present application is to provide a battery test fixture and a battery testing device to solve the technical problems of the battery test fixture in related technologies that can easily cause errors in test results and have the problems of difficult replacement, high cost, etc.

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

[0006] a housing;

[0007] a carrier comprising a first connecting portion, a bearing portion and a second connecting portion connected in sequence and bent, the first connecting portion and the second connecting portion connecting the outer wall of the housing, the bearing portion being spaced apart from the housing and forming a receiving gap, the receiving gap being used for receiving a battery;

[0008] a pressing plate, the pressing plate is arranged in the shell, and the pressing plate and the bearing part are arranged in a spaced manner, the pressing plate is capable of moving in a first direction to contact and press the battery, wherein the first direction is perpendicular to the bearing part; and

[0009] a driving structure, the driving structure is connected to the pressing plate, and the driving structure is capable of driving the pressing plate to move in the first direction or in a reverse direction of the first direction to adjust the distance between the pressing plate and the bearing part.

[0010] In the battery test fixture provided by the application, the bearing part comprises a first connecting part, a bearing part and a second connecting part which are connected in sequence and are bent, the first connecting part and the second connecting part are connected to the outer wall of the shell, the bearing part is arranged in a spaced manner with the shell and forms a receiving gap for receiving the battery, the pressing plate is arranged in the shell and is arranged in a spaced manner with the bearing part, the pressing plate is capable of moving in a first direction to contact and press the battery, wherein the first direction is perpendicular to the bearing part, the driving structure is connected to the pressing plate, and the driving structure is capable of driving the pressing plate to move in the first direction or in a reverse direction of the first direction to adjust the distance between the pressing plate and the bearing part. The driving structure can stop the pressing plate at any position on the moving path of the pressing plate, the size of the gap for free expansion of the battery can be accurately reserved, and the subsequent test on the expansion force of the battery is facilitated. Moreover, the driving structure directly drives the pressing plate to move, so that the distance between the pressing plate and the bearing part can be adjusted, the battery test fixture provided by the application can clamp and test batteries of different thickness types, other structural parts do not need to be replaced, the cost of the battery test fixture can be reduced, and the utilization rate of the battery test fixture can be improved.

[0011] The driving structure comprises a guide rod, a transmission gear and an adjusting assembly, the guide rod is connected to the pressing plate and is capable of driving the pressing plate to move in the first direction or in a reverse direction of the first direction, the outer periphery of the guide rod has a sawtooth structure, the transmission gear is engaged with the outer periphery of the guide rod, and the transmission gear drives the guide rod to move in the first direction or in a reverse direction of the first direction while rotating;

[0012] The outer periphery of the adjusting assembly has an external thread, the transmission gear is engaged with the external thread of the adjusting assembly, the adjusting assembly drives the transmission gear to rotate while rotating, and the guide rod is further driven to move in the first direction or in a reverse direction of the first direction.

[0013] The shell comprises a main body part, a first extension part and a second extension part, the main body part encloses a receiving space for receiving the transmission gear and the guide rod, and the first extension part and the second extension part are arranged at two ends of the main body part, respectively.

[0014] One end of the adjusting assembly is provided with the first extension part, and the other end is fixedly connected with the second extension part. The adjusting assembly comprises an adjusting knob and an adjusting screw rod connected with each other. The adjusting knob and the adjusting screw rod are respectively arranged on two sides of the first extension part. The outer periphery of the adjusting screw rod is engaged with the transmission gear.

[0015] The battery test fixture further comprises a locking structure arranged on the first extension part. The locking structure is used for locking the adjusting knob to limit the rotation of the adjusting knob and the adjusting screw rod.

[0016] The shell further comprises a reinforcing rib. One end of the reinforcing rib is connected with the first extension part, and the other end is connected with the second extension part.

[0017] The battery test fixture further comprises a pressure sensor arranged on the side of the pressing plate away from the bearing part. The pressure sensor is used for detecting the expansion force of the battery.

[0018] The transmission gear is provided with a plurality of lightening through holes.

[0019] The number of gears of the transmission gear is 35-45.

[0020] The moving distance range of the pressing plate along the first direction is 0cm-3cm.

[0021] In the second aspect, the application provides a battery test device. The battery test device comprises the battery test fixture and an electrical performance test assembly. The electrical performance test assembly is used for electrically connecting the battery.

[0022] In the battery test device provided by the application, the bearing part comprises a first connecting part, a bearing part and a second connecting part which are sequentially and foldably connected. The first connecting part and the second connecting part are connected with the outer wall of the shell. The bearing part is arranged in a spaced manner with the shell and forms a receiving gap for receiving the battery. The pressing plate is arranged in the shell and is arranged in a spaced manner with the bearing part. The pressing plate can move along the first direction to contact and press the battery. The first direction is perpendicular to the bearing part. The driving structure is connected with the pressing plate. The driving structure can be used to drive the pressing plate to move along the first direction or the opposite direction of the first direction, so as to adjust the distance between the pressing plate and the bearing part. The driving structure can stop the pressing plate at any position on the moving path of the pressing plate, so that the size of the free expansion gap of the battery can be accurately reserved, and the subsequent test of the expansion force of the battery can be facilitated. Moreover, the driving structure directly drives the pressing plate to move, so that the distance between the pressing plate and the bearing part can be adjusted. Therefore, the battery test device provided by the application can clamp and test batteries of different thickness types, and other structural parts do not need to be replaced. Therefore, the cost of the battery test device can be reduced, and the utilization rate of the battery test device can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0024] Figure 1 is a structural schematic diagram of a battery test fixture provided by an embodiment of the present application Figure 1 ;

[0025] Figure 2 is a structural schematic diagram of a battery test fixture provided by an embodiment of the present application Figure 2 ;

[0026] Figure 3 is a partial structural schematic diagram of a driving structure provided by an embodiment of the present application

[0027] Figure 4 is a structural schematic diagram of a driving structure provided by an embodiment of the present application

[0028] Label explanation:

[0029] Battery test fixture 100, housing 10, main body part 11, first extension part 12, second extension part 13, reinforcing rib 14, bearing part 20, first connecting part 21, bearing part 22, second connecting part 23, pressing plate 30, driving structure 40, guide rod 41, transmission gear 42, adjusting assembly 43, adjusting knob 431, adjusting lead screw 432, first threaded part 4321, second threaded part 4322. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort belong to the scope of protection of the present application.

[0031] It should be noted that the terms “first”, “second” and the like in the specification and claims of the present application and the above drawings are used to distinguish different objects, but are not used to describe a particular sequence. In addition, the terms “include” and “have” and any variations thereof are intended to cover non-exclusive inclusion.

[0032] In this specification, the words "center", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like used in relation to indicating the spatial positions or positional relationships of the components are used to describe the positional relationships of the components with reference to the drawings only for the convenience of describing this specification and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present disclosure. The positional relationships of the components are appropriately changed according to the directions of the components described. Therefore, it is not limited to the words described in the specification, and can be appropriately changed according to the circumstances.

[0033] In this specification, unless explicitly defined and limited otherwise, the terms "mount", "connect", "connection" should be understood broadly. For example, it can be fixedly connected, or detachably connected, or integrally connected; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate piece, or the communication inside two elements. For those skilled in the art, the meaning of the above terms in this disclosure can be understood according to the circumstances.

[0034] In the process of continuous charging and discharging, the thickness of the secondary battery changes, and the stress generated by the thickness of the secondary battery has a significant impact on its performance. At the same time, the volume change caused by the thickness change also greatly affects the application scenarios of the secondary battery. Therefore, during the development and testing stage of the secondary battery, introducing a pre-tightening force that can be accurately distributed on the surface of the secondary battery and reserving the size of the accurate free expansion gap is of great significance to the design of the secondary battery and the subsequent packaging and battery pack design.

[0035] In the related art, the battery test fixture directly clamps on the surface of the battery cell by using a rigid clamp plate to apply a pre-tightening force, and the pre-tightening force is realized by using a torque wrench to tighten the screw. This method cannot guarantee that the upper and lower clamping plates remain horizontal relative to the surface of the secondary battery being tested during the process of tightening the screw. At the same time, due to the expansion of the secondary battery, it is difficult for the traditional test fixture to determine the precise relationship between the expansion force and the thickness change. Furthermore, the torque wrench cannot guarantee the application of accurate pre-tightening force due to the user's technique during use. The traditional constant gap test fixture uses a rigid limiting block to reserve a part of the free expansion space for the secondary battery at the BOL stage. However, due to the difference in the initial thickness of the secondary battery, this method will produce certain errors in the test results. At the same time, for a large number of gradient experiments, this traditional test fixture needs to customize a large number of limiting devices of different sizes, which has the problems of difficult replacement, high cost and low reusability.

[0036] Please refer to Figure 1 and Figure 2 ,Figure 1 is a structural schematic of a battery test fixture provided by an embodiment of the present application Figure 1 , Figure 2 is a structural schematic of a battery test fixture provided by an embodiment of the present application Figure 2 .

[0037] The present application provides a battery test fixture 100 to solve the technical problems of the prior art that the battery test fixture is prone to cause errors in test results and is difficult to replace and has high cost.

[0038] The battery test fixture 100 comprises a housing 10, a bearing member 20, a pressing plate 30 and a driving structure 40. The bearing member 20 comprises a first connecting portion 21, a bearing portion 22 and a second connecting portion 23 connected in sequence and bent. The first connecting portion 21 and the second connecting portion 23 are connected to the outer wall of the housing 10. The bearing portion 22 is spaced apart from the housing 10 and forms a receiving gap. The receiving gap is used to accommodate a battery. The pressing plate 30 is arranged in the housing 10, and the pressing plate 30 and the bearing portion 22 are spaced apart. The pressing plate 30 can move along a first direction D1 to contact and press the battery, wherein the first direction D1 is perpendicular to the bearing portion 22. The driving structure 40 is connected to the pressing plate 30. The driving structure 40 can be used to drive the pressing plate 30 to move along the first direction D1 or the opposite direction of the first direction D1, so as to adjust the distance between the pressing plate 30 and the bearing portion 22.

[0039] The housing 10 comprises a main body portion 11, a first extension portion 12 and a second extension portion 13. The main body portion 11 forms a receiving space. The receiving space is used to accommodate at least part of the driving structure 40 and the pressing plate 30. Specifically, the main body portion 11 comprises a first side plate, a second side plate, a third side plate and a fourth side plate connected in sequence. The first side plate is perpendicular to the second side plate. The second side plate is perpendicular to the third side plate. The third side plate is perpendicular to the fourth side plate. The fourth side plate is perpendicular to the first side plate. The first side plate and the third side plate are spaced apart. The second side plate and the fourth side plate are spaced apart. The first side plate, the second side plate, the third side plate and the fourth side plate form a square receiving space.

[0040] The first extension 12 and the second extension 13 are respectively arranged at two ends of the main body 11, specifically, the first extension 12 is arranged on the first side plate, the second extension 13 is arranged on the third side plate, the first extension 12 and the second extension 13 are arranged at intervals and are used to connect the driving structure 40 to fix part of the driving structure 40 between the first extension 12 and the second extension 13 of the shell 10.

[0041] The carrier 20 comprises the first connecting portion 21, the carrying portion 22 and the second connecting portion 23 which are sequentially and flexibly connected, the first connecting portion 21 and the second connecting portion 23 connect the outer wall of the shell 10. Specifically, the first connecting portion 21 connects the outer wall of the second side plate, the second connecting portion 23 connects the outer wall of the fourth side plate, the carrying portion 22 is arranged corresponding to the accommodation space, the carrying portion 22 and the shell 10 are arranged at intervals and form an accommodation gap for accommodating the battery, and the carrying portion 22 can be used to carry the battery.

[0042] The pressing plate 30 is arranged in the shell 10, the pressing plate 30 and the shell 10 are arranged at intervals, so that the pressing plate 30 can move relative to the shell 10 to avoid the shell 10 interfering with the movement of the pressing plate 30. Optionally, the distance between the pressing plate 30 and the shell 10 is 0.1mm-10mm.

[0043] The pressing plate 30 and the carrying portion 22 are arranged at intervals, the pressing plate 30 can move along the first direction D1 to contact and press the battery. Specifically, the pressing plate 30 can move along the first direction D1 to press the battery on the carrying portion 22 to fix the battery between the pressing plate 30 and the carrying portion 22. Also, the pressing plate 30 can also move in the opposite direction of the first direction D1 and be arranged at intervals with the battery to provide a corresponding expansion space for the battery. Wherein, the first direction D1 is perpendicular to the carrying portion 22, in other words, the first direction D1 is the vertical direction in Figure 1 and Figure 2 .

[0044] The battery test fixture 100 further comprises the driving structure 40, the driving structure 40 connects the pressing plate 30, the driving structure 40 can be used to drive the pressing plate 30 to move along the first direction D1 or the opposite direction of the first direction D1 to adjust the distance between the pressing plate 30 and the carrying portion 22.

[0045] It should be noted that the driving structure 40 can be used to drive the pressing plate 30 to move along the first direction D1 or the opposite direction of the first direction D1, and the driving structure 40 can stop the pressing plate 30 at any position of the moving path of the pressing plate 30 to adjust the distance between the pressing plate 30 and the bearing part 22, so that the size of the free expansion gap of the battery can be accurately reserved, and the subsequent test on the expansion force of the battery can be facilitated. Moreover, the driving structure 40 directly drives the pressing plate 30 to move, so that the distance between the pressing plate 30 and the bearing part 22 can be adjusted, the battery test fixture 100 of the present application can clamp and test the battery of different thickness types, and other structural parts do not need to be replaced, so that the cost of the battery test fixture 100 can be reduced and the utilization rate of the battery test fixture 100 can be improved.

[0046] In the battery test fixture 100 provided by the present application, the bearing part 20 comprises the first connecting part 21, the bearing part 22 and the second connecting part 23 which are sequentially and flexibly connected, the first connecting part 21 and the second connecting part 23 are connected to the outer wall of the shell 10, the bearing part 22 is spaced apart from the shell 10 and forms a receiving gap for receiving the battery, the pressing plate 30 is arranged in the shell 10 and is spaced apart from the bearing part 22, the pressing plate 30 can move along the first direction D1 to contact and press the battery, wherein the first direction D1 is perpendicular to the bearing part 22, the driving structure 40 is connected to the pressing plate 30, and the driving structure 40 can be used to drive the pressing plate 30 to move along the first direction D1 or the opposite direction of the first direction D1 to adjust the distance between the pressing plate 30 and the bearing part 22. The driving structure 40 can stop the pressing plate 30 at any position of the moving path of the pressing plate 30, so that the size of the free expansion gap of the battery can be accurately reserved, and the subsequent test on the expansion force of the battery can be facilitated. Moreover, the driving structure 40 directly drives the pressing plate 30 to move, so that the distance between the pressing plate 30 and the bearing part 22 can be adjusted, the battery test fixture 100 of the present application can clamp and test the battery of different thickness types, and other structural parts do not need to be replaced, so that the cost of the battery test fixture 100 can be reduced and the utilization rate of the battery test fixture 100 can be improved.

[0047] It should be noted that, alternatively, in the embodiment, the moving distance range of the pressing plate 30 along the first direction D1 is 0cm-3cm. The moving distance range of the pressing plate 30 along the first direction D1 can be adjusted according to the type and specification of the battery to be tested by the battery test fixture 100. For example, the moving distance range of the pressing plate 30 along the first direction D1 can be 0.2cm, or 0.5cm, or 0.8cm, or 1.0cm, or 1.2cm, or 1.5cm, or 1.7cm, or 1.9cm, or 2.0cm, or 2.4cm, or 2.6cm, or 2.8cm, or 3cm, or other distances within the range of 0cm-3cm, which are not limited in the present application.

[0048] Please refer to Figures 1 to 4 , Figure 3 is a partial structure schematic diagram of a driving structure provided by the embodiment of the present application, Figure 4 is a structure schematic diagram of a driving structure provided by the embodiment of the present application.

[0049] In an embodiment, the driving structure 40 comprises a guide rod 41, a transmission gear 42 and an adjusting assembly 43. The guide rod 41 is connected to the pressing plate 30 and used to drive the pressing plate 30 to move along the first direction D1 or the opposite direction of the first direction D1. The guide rod 41 has a sawtooth structure on the outer periphery. The transmission gear 42 is engaged with the outer periphery of the guide rod 41. The transmission gear 42 drives the guide rod 41 to move along the first direction D1 or the opposite direction of the first direction D1 while rotating.

[0050] Specifically, the guide rod 41 is a flat cuboid, and one end of the guide rod 41 is connected to the pressing plate 30. At least one long side of the guide rod 41 is provided with the sawtooth structure. The transmission gear 42 is engaged with the sawtooth structure to drive the guide rod 41 to move along the first direction D1 or the opposite direction of the first direction D1 while rotating.

[0051] It should be noted that, in the embodiment, the guide rod 41 and the pressing plate 30 are integrated, that is, the guide rod 41 and the pressing plate 30 are integrally prepared by one process. In other embodiments, the guide rod 41 and the pressing plate 30 can also be a split structure and be fixed by gluing, screw connection or other fixing methods, which are not limited in the present application.

[0052] In an embodiment, the transmission gear 42 is provided with a plurality of weight-reducing through holes, which can be used to reduce the overall weight of the battery test fixture 100 and achieve the lightweight of the battery test fixture 100.

[0053] Further, in the embodiment, the number of the transmission gears 42 is 2, and the two transmission gears 42 are respectively arranged on the two sides of the guide rod 41. Similarly, the sawtooth structure is arranged on the two sides of the guide rod 41 to respectively engage with the two transmission gears 42. The two transmission gears 42 are arranged on the two sides of the guide rod 41, and the rotation of the two transmission gears 42 drives the guide rod 41 to move along the first direction D1 or the reverse direction of the first direction D1, which is beneficial to improve the stability of the movement of the guide rod 41.

[0054] It should be noted that when the number of the transmission gears 42 is 2, the two transmission gears 42 are respectively arranged on the two sides of the guide rod 41, and the rotation directions of the two transmission gears 42 are opposite, so that the guide rod 41 can move along the first direction D1 or the reverse direction of the first direction D1. Specifically, for example, as shown in Figure 4 if the left transmission gear 42 rotates in the clockwise direction and the right transmission gear 42 rotates in the counterclockwise direction, the guide rod 41 and the pressing plate 30 are driven to move along the first direction D1; if the left transmission gear 42 rotates in the counterclockwise direction and the right transmission gear 42 rotates in the clockwise direction, the guide rod 41 and the pressing plate 30 are driven to move along the reverse direction of the first direction D1.

[0055] Further optionally, in an embodiment, the number of gears of the transmission gear 42 is 35-45, for example, the number of gears of the transmission gear 42 can be 35, or 36, or 37, or 38, or 39, or 40, or 41, or 42, or 43, or 44, or 45, which is not limited in the application.

[0056] The battery test fixture 100 further comprises the adjusting assembly 43, one end of the adjusting assembly 43 is arranged through the first extension 12, and the other end is fixedly connected to the second extension 13. The adjusting assembly 43 has an outer thread on the outer periphery. The transmission gear 42 and the outer thread of the adjusting assembly 43 are clamped. The rotation of the adjusting assembly 43 drives the transmission gear 42 to rotate, and in turn drives the guide rod 41 to move along the first direction D1 or the reverse direction of the first direction D1.

[0057] It should be noted that when the number of the transmission gears 42 is 2, the adjusting assembly 43 needs to drive the two transmission gears 42 to rotate in opposite directions. The specific structure of the adjusting assembly 43 is exemplarily described below, which should not be understood as a limitation on the application.

[0058] Specifically, the adjusting assembly 43 comprises an adjusting knob 431 and an adjusting screw 432 connected with each other, the adjusting knob 431 and the adjusting screw 432 are respectively arranged on two sides of the first extending part 12, and the outer periphery of the adjusting screw 432 is engaged with the transmission gear 42.

[0059] Further, the outer periphery of the adjusting screw 432 comprises a first threaded part 4321 and a second threaded part 4322, the threaded direction of the first threaded part 4321 is opposite to the threaded direction of the second threaded part 4322, that is, the first threaded part 4321 and the second threaded part 4322 are symmetrically arranged. The first threaded part 4321 is used for connecting the left transmission gear 42, and the second threaded part 4322 is used for connecting the right transmission gear 42, the threaded direction of the first threaded part 4321 is opposite to the threaded direction of the second threaded part 4322, so that the adjusting screw 432 can drive the two transmission gears 42 to rotate in opposite directions, and further drive the guide rod 41 and the pressing plate 30 to move along the first direction D1 or the opposite direction of the first direction D1.

[0060] The adjusting knob 431 and the adjusting screw 432 are respectively arranged on two sides of the first extending part 12, and the adjusting knob 431 can be used for being rotated by an operator, so as to facilitate the operator to control and adjust the distance between the pressing plate 30 and the bearing part 22.

[0061] In an embodiment, the battery test fixture 100 further comprises a locking structure (not shown) arranged on the first extending part 12, and the locking structure is used for locking the adjusting knob 431 to limit the rotation of the adjusting knob 431 and the adjusting screw 432. The locking structure can be used for locking the adjusting knob 431 to limit the rotation of the adjusting knob 431 and the adjusting screw 432, and further limit the movement of the guide rod 41 and the pressing plate 30 along the first direction D1 or the opposite direction of the first direction D1, so as to ensure that the gap between the pressing plate 30 and the bearing part 22 of the battery test fixture 100 is not affected by the change of the thickness of the battery when the battery is clamped, and improve the test effect of the battery.

[0062] It should be noted that the specific structure of the locking structure is not limited in the present application, and should not be understood as a limitation of the present application.

[0063] In one embodiment, the shell 10 further comprises a reinforcing rib 14, one end of which is connected to the first extension 12 and the other end of which is connected to the second extension 13. The reinforcing rib 14 can be used to improve the overall structural rigidity of the shell 10, so as to avoid the shell 10 from being damaged, such as being cracked, when the battery test fixture 100 clamps the battery.

[0064] In one embodiment, the battery test fixture 100 further comprises a pressure sensor, which is arranged on the side of the pressure plate 30 away from the bearing portion 22. The pressure sensor is used to detect the swelling force of the battery. In this embodiment, the pressure sensor is a thin-film pressure sensor. In other embodiments, the pressure sensor can also be of other types, which are not limited in the present application.

[0065] The present application also provides a battery test device, which comprises the battery test fixture 100 and an electrical performance test assembly, which is used to electrically connect the battery.

[0066] The following description of the battery test device illustrates the test method for the battery, which should not be understood as a limitation of the present application.

[0067] Test method one: the battery is placed in front of the battery test fixture 100, the thickness d of the battery is measured first, then the position of the pressure plate 30 is adjusted to the required height by rotating the adjusting knob 431 and the adjusting screw 432, at this time, the distance between the pressure plate 30 and the bearing plate is d+x (x≥0).

[0068] Further, when x=0, i.e. the distance between the pressure plate 30 and the bearing plate is d, the battery starts to be tested, at this time, the pressure plate 30 is tightly attached to the surface of the battery being tested, but does not exert any pre-tightening force on the battery.

[0069] Further, the locking structure is opened, at this time, the position of the pressure plate 30 no longer changes.

[0070] Further, the electrical performance test, including but not limited to the cycle test, storage test, working condition test and rate test, etc., is started by the electrical performance test assembly.

[0071] Further, during the test, the battery being tested continuously generates swelling force due to the charging and discharging behavior, but the deformation of the battery being tested in the thickness direction is constrained, the battery being tested squeezes the pressure plate 30, and the swelling force generated by the battery being tested during the test is obtained according to the real-time reading of the pressure sensor that can be connected to the pressure plate 30.

[0072] Further, by comparing the data of the pressure sensor and other testing devices at different testing stages of the battery at BOL state, the time point of the appearance of the swelling force of the battery and the overall change trend during the whole testing process can be obtained.

[0073] Test method two:

[0074] The battery is placed in front of the battery testing fixture 100, and the thickness d of the battery is measured first. Then, the adjusting knob 431 and the adjusting screw 432 are rotated to adjust the position of the pressing plate 30 to the required height, and the distance between the pressing plate 30 and the bearing plate at this time is d+x (x≥0).

[0075] Further, when x>0, the test is started, and the position of the pressing plate 30 is adjusted according to the required test conditions at this time, and the distance between the pressing plate 30 and the surface of the battery being tested at this time is x.

[0076] Further, the locking structure is opened, and the position of the pressing plate 30 no longer changes at this time.

[0077] Further, the electrical performance test assembly is used to start repeated electrical performance tests, including but not limited to cycle tests, storage tests, working condition tests, and rate tests.

[0078] Further, during the test, the battery being tested continuously generates swelling force with the charging and discharging behavior, and the battery being tested freely swells without touching the pressing plate 30 before the thickness change of the battery being tested reaches x; when the thickness change reaches x and during the subsequent test, the change of the battery being tested in the thickness direction is constrained, and at this time, the swelling force generated by the battery being tested during the test can be obtained according to the real-time reading of the pressure sensor that can be connected to the pressing plate 30.

[0079] Further, by using different test conditions, the most suitable size of the reserved free swelling gap can be obtained.

[0080] In summary, the above two test methods can be used for the battery testing device of the present application, and of course, the battery testing device of the present application can also be used for other test methods, and the present application does not limit this.

[0081] The battery testing device provided in the application, the bearing part 20 comprises the first connecting part 21, the bearing part 22 and the second connecting part 23 which are sequentially and flexibly connected, the first connecting part 21 and the second connecting part 23 are connected to the outer wall of the shell 10, the bearing part 22 is spaced apart from the shell 10 and forms a receiving gap for receiving the battery, the pressing plate 30 is arranged in the shell 10 and is spaced apart from the bearing part 22, the pressing plate 30 can be moved along the first direction D1 to contact and press the battery, wherein the first direction D1 is perpendicular to the bearing part 22, the driving structure 40 is connected to the pressing plate 30, and the driving structure 40 can be used to drive the pressing plate 30 to move along the first direction D1 or the opposite direction of the first direction D1, so as to adjust the distance between the pressing plate 30 and the bearing part 22. The driving structure 40 can stop the pressing plate 30 at any position on the moving path of the pressing plate 30, and the size of the free expansion gap of the battery can be accurately reserved, so that the subsequent test on the expansion force of the battery can be facilitated. Moreover, the driving structure 40 directly drives the pressing plate 30 to move, so that the distance between the pressing plate 30 and the bearing part 22 can be adjusted, so that the battery testing device can clamp and test batteries of different thickness types, and other structural parts do not need to be replaced, so that the cost of the battery testing device can be reduced and the utilization rate of the battery testing device can be improved.

[0082] In the present application, the phrase "embodiment" or "embodiments" means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment that is not mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present application can be combined with other embodiments. In addition, it should be understood that the features, structures or characteristics described in the embodiments of the present application can be combined with each other without contradiction, to form another embodiment without departing from the spirit and scope of the present application.

[0083] The above is part of the embodiments of the present application. It should be pointed out that, for ordinary skilled in the art, without departing from the principle of the present application, a number of improvements and refinements can be made, which are also considered as the protection scope of the present application.

Claims

1. A battery test fixture, comprising: The battery test fixture comprises: a housing; a carrier comprising a first connecting portion, a carrier portion and a second connecting portion connected in sequence, the first connecting portion and the second connecting portion being connected to the outer wall of the housing, the carrier portion being spaced apart from the housing and forming a receiving gap for receiving a battery; a pressing plate arranged in the housing and spaced apart from the carrier portion, the pressing plate being capable of moving in a first direction to contact and press the battery, wherein the first direction is perpendicular to the carrier portion; a driving structure connected to the pressing plate, the driving structure being capable of driving the pressing plate to move in the first direction or the opposite direction of the first direction to adjust the distance between the pressing plate and the carrier portion. The driving structure comprises a guide rod connected to the pressing plate and capable of driving the pressing plate to move in the first direction or the opposite direction of the first direction, the outer periphery of the guide rod having a sawtooth structure, a transmission gear meshing with the outer periphery of the guide rod, the transmission gear being capable of driving the guide rod to move in the first direction or the opposite direction of the first direction while rotating; 2. The battery test fixture of claim 1, wherein, the outer periphery of the adjusting assembly has external threads, the transmission gear and the external threads of the adjusting assembly being meshed, the adjusting assembly being capable of driving the transmission gear to rotate while rotating, thereby driving the guide rod to move in the first direction or the opposite direction of the first direction. The housing comprises a main body portion, a first extension portion and a second extension portion, the main body portion enclosing a receiving space for receiving the transmission gear and the guide rod, the first extension portion and the second extension portion being arranged at two ends of the main body portion respectively; 3. The battery test fixture of claim 2, wherein, one end of the adjusting assembly penetrates through the first extension portion, and the other end is fixedly connected to the second extension portion, the adjusting assembly comprising an adjusting knob and an adjusting screw connected in sequence, the adjusting knob and the adjusting screw being arranged at two sides of the first extension portion respectively, the outer periphery of the adjusting screw meshing with the transmission gear. The battery test fixture further comprises a locking structure arranged on the first extension portion, the locking structure being capable of locking the adjusting knob to limit the rotation of the adjusting knob and the adjusting screw.

4. The battery test fixture of claim 3, wherein, The housing further comprises a reinforcing rib, one end of the reinforcing rib being connected to the first extension portion, and the other end being connected to the second extension portion.

5. The battery test fixture of claim 3, wherein, The battery test fixture further comprises a pressure sensor arranged on the side of the pressing plate away from the carrier portion, the pressure sensor being capable of detecting the swelling force of the battery.

6. The battery test fixture of claim 2, wherein, The transmission gear is provided with a plurality of weight-reducing through holes.

7. The battery test fixture of any of claims 2-6, wherein, The number of gears of the transmission gear is 35-45.

8. The battery test fixture of any of claims 2-6, wherein, The moving distance of the pressing plate in the first direction ranges from 0 cm to 3 cm.

9. The battery test fixture of any of claims 1-6, wherein, The battery test fixture and the electrical performance test assembly according to any one of claims 1-9 are used for electrically connecting the battery.

10. A battery testing device, characterized by, ​

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