Battery cell test fixture

Abstract

The utility model relates to the technical field of battery cells, in particular to a battery cell test fixture. The battery cell test clamp comprises a fixing plate. The fixing plate comprises a first base and a plurality of bearing pieces. The plurality of bearing parts have the same appearance structure, the plurality of bearing parts are respectively provided with a first accommodating cavity for mounting a battery cell, and the first accommodating cavities of the plurality of bearing parts are different in dimension specification; a target bearing part in the multiple bearing parts is detachably connected with the first structure. When the fixing plate is used, the corresponding bearing part is selected to be detachably mounted on the first base according to the characteristics of the size, the shape and the like of the selected battery cell, so that the fixing plate can be matched with the battery cell of the model. In the capacity grading test of different types of battery cells, only the bearing piece on the fixing plate needs to be replaced, and the whole battery cell test fixture does not need to be replaced. Therefore, on one hand, the configuration cost of the battery cell test fixture is improved, on the other hand, the operation is convenient, and the test efficiency of different types of battery cells during testing can be effectively improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of battery cells, in particular to a battery cell test fixture. BACKGROUND

[0002] A battery cell test link, such as a battery cell capacity grading, is one of the most important links in the battery cell processing and production process. In the battery cell test link, technicians need to fix the battery cell with an appropriate battery cell test fixture. However, the size and shape of the existing battery cell are not uniform, which means that the battery cell test fixture also needs to be customized to change the shape and size of the battery cell. This not only increases the configuration cost of the battery cell test fixture, but also forces technicians to frequently replace the battery cell test fixture when facing different models of battery cells, thereby slowing down the efficiency of the battery cell test. CONTENT OF THE UTILITY MODEL

[0003] The application provides a battery cell test fixture to at least solve the above technical problems. The battery cell test fixture described in the application comprises a fixed plate;

[0004] The fixed plate comprises a first base and a plurality of bearing pieces;

[0005] The plurality of bearing pieces have the same outer shape structure, and a first accommodating cavity for installing a battery cell is formed on each of the plurality of bearing pieces, and the size specifications of the first accommodating cavities of the plurality of bearing pieces are different;

[0006] The target bearing piece in the plurality of bearing pieces is detachably connected with the first base.

[0007] Optionally, the first base is provided with a second accommodating cavity, the size specifications of the second accommodating cavity are the same as the outer shape structure of the plurality of bearing pieces, and the bearing piece is installed in the second accommodating cavity.

[0008] Optionally, the fixed plate comprises a clamping mechanism, and the clamping mechanism comprises a fixed part, a movable part and a first elastic piece;

[0009] The bearing piece is provided with a first guide groove, and the first base is provided with a second guide groove; the first end of the second guide groove is arranged towards the fixed part, the second end of the second guide groove is in communication with the first end of the first guide groove, and the second end of the first guide groove is in communication with the first accommodating cavity;

[0010] The movable part is movably installed in the first guide groove and the second guide groove, the fixed part is fixedly installed in the first base, and the first elastic piece is arranged between the fixed part and the movable part; the first elastic piece is used for pressing the movable part on the battery cell.

[0011] Optionally, the fixed plate comprises a charging and discharging assembly;

[0012] The charging and discharging assembly comprises probes and a mounting structure; the probes are two and are spaced apart, and the mounting structure is provided with mounting holes; the mounting holes are spaced apart in the direction along which the probes are spaced apart, and the probes are mounted in target mounting holes in the mounting holes.

[0013] Optionally, the mounting structure comprises a second base, a movable seat and a second elastic member.

[0014] The second base is fixedly mounted on the first base, and the second base comprises a first guide rail extending towards the first accommodating cavity.

[0015] The movable seat is movably mounted on the first guide rail, and the mounting holes are arranged on the movable seat.

[0016] The second elastic member is arranged between the first base and the movable seat, and the second elastic member is used to move the probes away from the first accommodating cavity.

[0017] Optionally, the battery cell testing fixture comprises a pressing mechanism.

[0018] The pressing mechanism comprises a first moving member, a second moving member, a first driving member and a second driving member.

[0019] The power output end of the first driving member is in transmission connection with the first moving member to drive the first moving member to move in a first direction; the second driving member is fixed on the first moving member to drive the second moving member to move in a second direction and press the movable seat of the mounting structure; and the first direction intersects with the second direction.

[0020] Optionally, the movable seat comprises a roller, and the roller is used to contact the second moving member.

[0021] Optionally, the battery cell testing fixture comprises a pressing mechanism.

[0022] The pressing mechanism comprises a first rack, a second rack, a guide rod and a driving assembly.

[0023] The first rack and the second rack are spaced apart opposite to each other; the first end of the guide rod is fixedly connected with the first rack, and the second end of the guide rod is fixedly connected with the second rack; and at least two fixing plates are stacked along the axial direction of the guide rod and are movably mounted on the guide rod.

[0024] The driving assembly is mounted on at least one of the first rack and the second rack, and the power output end of the driving assembly is used to press the fixing plates in the axial direction of the guide rod.

[0025] Optionally, the driving assembly comprises a driving motor, a lead screw and a driving plate.

[0026] The driving motor is arranged on the first rack, and a power output end of the driving motor is in transmission connection with a first end of the lead screw.

[0027] The first end of the lead screw is rotatably arranged on the first rack, and a second end of the lead screw is rotatably arranged on the second rack.

[0028] The driving plate is movably arranged on the guide rod and is in screw connection with the lead screw, so as to serve as the power output end of the driving assembly.

[0029] Optionally, a pressure sensor is arranged on a side of the second rack facing the fixed plate.

[0030] Optionally, a temperature probe is arranged on the first base, and the temperature probe is used for detecting the temperature of the battery cell in the first accommodating cavity.

[0031] Optionally, a flow channel is arranged in the first base, and an inlet and an outlet in communication with the flow channel are arranged on the surface of the first base. The inlet is used for flowing the refrigerant into the flow channel, and the outlet is used for flowing the refrigerant out of the flow channel.

[0032] In some implementations of the present application, the fixed plate of the battery cell test fixture described in the present application has a first base and a plurality of load carriers. Each of the load carriers is provided with a first accommodating cavity for mounting a battery cell, and the first accommodating cavities of the load carriers are different from each other. The first base has a mounting structure, and the load carriers can be detachably mounted on the mounting structure. In use, only the corresponding load carrier needs to be selected and detachably mounted on the first base according to the size, shape and other characteristics of the selected battery cell, so that the fixed plate can be adapted to the battery cell of this model. In the test of different models of battery cells, only the load carrier on the fixed plate needs to be replaced, without the need to replace the whole battery cell test fixture. In this way, on the one hand, the configuration cost of the battery cell test fixture is improved, and on the other hand, the operation is facilitated, and the test efficiency of different models of battery cells in the test can be effectively improved.

[0033] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0034] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the appended drawings.

[0035] Figure 1 is a schematic diagram of the overall structure of the battery cell test fixture described in the embodiments of the present application.

[0036] Figure 2 is Figure 1 a structure diagram of a fixed plate in the middle;

[0037] Figure 3 is Figure 2 a structure diagram of a charge-discharge assembly in the middle;

[0038] Figure 4 is Figure 1 a structure diagram of a pressing mechanism in the middle;

[0039] Figure 5 is Figure 1 a structure diagram of a pressing mechanism in the middle;

[0040] Figure 6 is Figure 2 a sectional view of a first base in the middle;

[0041] Fig. 1, fixed plate; 11, first base; 111, second accommodating cavity; 112, second guide groove; 12, bearing piece; 121, first accommodating cavity; 122, first guide groove; 13, clamping mechanism; 131, fixed part; 132, movable part; 133, first elastic piece; 14, charge-discharge assembly; 141, probe; 142, mounting structure; 1421, mounting hole; 1422, second base; 14221, first guide rail; 1423, movable seat; 14231, roller; 1424, second elastic piece; 15, temperature probe; 16, flow channel; 17, inlet; 18, outlet; 2, pressing mechanism; 21, first moving piece; 22, second moving piece; 23, first driving piece; 24, second driving piece; 3, pressing mechanism; 31, first rack; 32, second rack; 33, guide rod; 34, driving assembly; 341, driving motor; 342, screw rod; 343, driving plate; 35, pressure sensor; 4, battery cell; 5, pipeline. DETAILED DESCRIPTION

[0042] The embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only, for the purpose of explaining the present application, and should not be understood as a limitation to the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0043] The capacity test is an extremely important link in the production and processing process of the battery cell. Under the fixed requirements, the technician first charges the battery cell; after full charging, it is discharged under certain conditions. At this time, the capacity of the battery cell is discharged. The technician classifies the battery cell according to the capacity, and this process is the capacity classification process. In the capacity classification process, the technician can classify the qualified product and the unqualified product according to the capacity classification result. That is, when the capacity of the battery cell meets the requirements, it is a qualified product. When the capacity of the battery cell is lower than the specification, it is an unqualified product. Capacity classification is also beneficial to the technician to classify and group the battery cell, that is, to select the inner group and the battery cell with the same capacity to combine into a battery pack. In this way, the performance of the battery cells in the battery pack can be consistent, preventing the discharge depth of each battery cell in the battery pack from being inconsistent. The inconsistent discharge depth of each battery cell will cause the battery cell with small capacity and poor performance to reach the full charge state in advance during charging, and the battery cell with large capacity and good performance cannot reach the full charge state, thereby causing the decline of the charge and discharge performance of the battery pack.

[0044] In the capacity classification, the technician usually uses a clamp to fix a plurality of battery cells and synchronously charges and discharges the battery cells. In order to ensure the adaptive relationship between the battery cell and the clamp, a single clamp usually corresponds to a single battery cell model. When facing the capacity classification demand of multiple specifications and multiple models of battery cells, the technician needs to use multiple sets of clamps to clamp different battery cells. This will greatly increase the configuration cost of the clamp on the one hand, and it is also troublesome to operate, which is not conducive to improving the efficiency of the capacity classification.

[0045] Therefore, the present application provides a battery cell test clamp.

[0046] Embodiment 1 of the battery cell test clamp described in the present application:

[0047] Referring to Figure 1 and Figure 2 , the battery cell test clamp described in Embodiment 1 of the present application comprises a fixed plate 1. The fixed plate 1 is in a plate-like structure as a whole, and specifically comprises a first base 11 and a bearing 12.

[0048] As shown in Figure 2 , the first base 11 is also in a plate-like structure. The bearing 12 is detachably connected with the first base 11, so as to replace different bearings 12 at any time as needed. One bearing 12 can be installed on the first base 11, or two, three or more bearings 12 can be installed.

[0049] Corresponding to the same first base 11, the plurality of carriers 12 are arranged. Each carrier 12 is provided with a first accommodating cavity 121 for mounting the battery cell 4. In the embodiment, the carrier 12 can be a plate structure, and the first accommodating cavity 121 is a concave cavity formed on the surface of the carrier 12. The recess direction of the first accommodating cavity 121 can be arranged along the thickness direction of the carrier 12, and the size specification is consistent with the outer dimensions of the corresponding battery cell 4. The size specification of the first accommodating cavity 121 refers to the shape, depth, width, length, etc. of the first accommodating cavity 121, and the outer dimensions of the battery cell 4 refer to the shape, length, width, and height of the battery cell 4. During the capacity test, a target carrier is selected from the plurality of carriers 12 and mounted on the first base 11. The target carrier is the carrier 12 whose size specification of the first accommodating cavity 121 is consistent with the outer dimensions of the battery cell 4 to be tested. The battery cell 4 is fixedly mounted in the first accommodating cavity 121 to ensure the fixing effect of the battery cell test fixture on the battery cell 4. For the plurality of carriers 12 in the same set, the first accommodating cavities 121 on the carriers 12 are all different from each other. Specifically, the shape and size of the first accommodating cavity 121 on a single carrier 12 are the same as the outer dimensions of a single type of battery cell 4; the plurality of carriers 12 in the same set correspond to a plurality of battery cells 4 with different outer dimensions. The outer shape and size of the plurality of carriers 12 in the same set are consistent, so as to be easily interchangeable.

[0050] During the capacity test, according to the outer dimensions of the battery cell 4, the corresponding carrier 12 is selected and mounted on the first base 11, and then the battery cell 4 is mounted in the first accommodating cavity 121 of the carrier 12. When the outer dimensions of the battery cell 4 change, only the corresponding carrier 12 needs to be replaced, so that the battery cell test fixture can be adapted to battery cells 4 with different outer dimensions. This process does not require replacement of other structures of the battery cell test fixture, thereby effectively reducing the configuration cost of the battery cell test fixture. In addition, since the carrier 12 is modularly assembled on the first base 11, the disassembly process is simple, thereby facilitating the improvement of the efficiency of the capacity test of battery cells 4 with different outer dimensions.

[0051] Optionally, reference can be made to Figure 2As shown, the first base 11 is provided with a second accommodating cavity 111. In the embodiment, the second accommodating cavity 111 is specifically an inner concave cavity provided on the surface of the first base 11. The recess direction of the second accommodating cavity 111 can be provided along the thickness direction of the first base 11, and the size specification is consistent with the external shape and size of the corresponding carrier 12. The multiple carriers 12 in the same set can have the same external shape and size, so that the size specification of the second accommodating cavity 111 can be adapted to the multiple carriers 12. During the capacity test, the carrier 12 is installed in the second accommodating cavity 111. The second accommodating cavity 111 can provide limiting in multiple directions, which can effectively ensure the installation effect of the first base 11 on the carrier 12. At the same time, the carrier 12 is directly installed in the second accommodating cavity 111, which can simplify the disassembly and assembly steps of the carrier 12, thereby improving the disassembly and replacement efficiency of the carrier 12, and further improving the efficiency of the capacity test of the battery cell 4 with different external shapes and sizes. The carrier 12 can be detachably installed in the second accommodating cavity 111, which is also beneficial to reduce the occupied space of the fixing plate 1. When multiple fixing plates 1 are arranged on the battery cell test fixture, the number of fixing plates 1 that can be arranged on the battery cell test fixture can be increased, thereby increasing the number of battery cells 4 that can be clamped by the battery cell test fixture. Alternatively, the mounting structure 142 can also be a threaded hole, so that the carrier 12 can be detachably installed on the first base 11 by a fastener.

[0052] Alternatively, the fixing plate 1 can include a clamping mechanism 13, and the clamping mechanism 13 is used to realize the detachable connection between the carrier 12 and the first base 11.

[0053] Specifically, the clamping mechanism 13 includes a fixed part 131, a movable part 132 and a first elastic member 133. Corresponding to the movable part 132 of the clamping mechanism 13, the carrier 12 is provided with a first guide groove 122, and the first base 11 is provided with a second guide groove 112. The first installation groove and the second installation groove extend in the same direction and are communicated. The first end of the second guide groove 112 is arranged towards the fixed part 131, the second end of the second guide groove 112 is communicated with the first end of the first guide groove 122, and the second end of the first guide groove 122 is communicated with the first accommodating cavity 121.

[0054] The movable part 132 is movably installed in the first guide groove 122 and the second guide groove 112, so as to move along the extension direction of the first guide groove 122 and the second guide groove 112. The fixed part 131 is fixedly installed on the first base 11, and the first elastic member 133 is arranged between the fixed part 131 and the movable part 132. The first elastic member 133 provides an elastic force to the movable part 132 in the direction of the first accommodating cavity 121, so that on the one hand, the movable part 132 can be kept in the first guide groove 122 and the second guide groove 112, so as to prevent the carrier 12 from being taken out of the second accommodating cavity 111. On the other hand, the first elastic member 133 can press the movable part 132 against the battery cell 4, so that the battery cell 4 is pressed against the side wall of the first accommodating cavity 121. In this way, the friction between the movable part 132 and the battery cell 4, and between the battery cell 4 and the first accommodating cavity 121 can be increased, so as to prevent the battery cell 4 from being taken out of the first accommodating cavity 121. The arrangement of the clamping mechanism 13 synchronously ensures the fixing effect of the battery cell 4 in the first accommodating cavity 121 and the carrier 12 in the second accommodating cavity 111. While ensuring the reliable connection between the battery cell 4 and the carrier 12, and between the carrier 12 and the first base 11, the arrangement of the redundant clamping mechanism 13 is avoided, so as to effectively reduce the occupied space of the fixing plate 1.

[0055] Optionally, the fixing plate 1 further comprises a charging and discharging assembly 14.

[0056] For reference Figure 3 As shown in the figure, the charging and discharging assembly 14 comprises a probe 141 and a mounting structure 142. The probe 141 is provided with two probes and is arranged at intervals, so as to be in contact with the pole of the battery cell 4 and perform charging and discharging. The mounting structure 142 is provided with a mounting hole 1421 for mounting the probe 141, so that the probe 141 is fixedly installed on the mounting structure 142 by means of a fastener. The mounting holes 1421 are arranged at intervals along the direction in which the probes 141 are arranged at intervals. In use, the technician can install the probe 141 on the target mounting hole in the plurality of mounting holes 1421 according to the pole spacing of the battery cell 4 actually assembled on the carrier 12, so that the spacing between the pair of probes 141 can be adjusted to adapt to the change of the battery cell 4. The target mounting hole is the mounting hole 1421 opposite to the position of the pole of the battery cell 4 currently tested among the plurality of mounting holes 1421.

[0057] Optionally, the mounting structure 142 comprises a second base 1422, a movable seat 1423 and a second elastic member 1424.

[0058] For reference Figure 3 As shown in the figure, the second base 1422 is fixedly installed on the first base 11. In this embodiment, the second base 1422 and the first base 11 are fixedly connected by means of a fastener. Specifically, for reference Figure 3As shown, the second base 1422 can include a vertical plate, and a flange is arranged on one side of the vertical plate facing the first base 11. A long strip-shaped hole can be formed on the flange to adjust the position of the second base 1422. The first guide rail 14221 is fixedly installed on the second base 1422 and extends towards the first accommodating cavity 121.

[0059] The movable seat 1423 is movably installed on the first guide rail 14221 to move towards or away from the first accommodating cavity 121 along the first guide rail 14221. The mounting hole 1421 is arranged on the movable seat 1423 to enable the probe 141 to move towards or away from the first accommodating cavity 121 synchronously with the movable seat 1423. The second elastic member 1424 is arranged between the first base 11 and the movable seat 1423 and provides an elastic force to the movable seat 1423 in a direction away from the first accommodating cavity 121 to move the probe 141 away from the first accommodating cavity 121. The second base 1422 is provided with a baffle on a side of the movable seat 1423 away from the second elastic member 1424 to limit the stroke of the movable seat 1423 in a direction away from the second elastic member 1424. In use, the movable seat 1423 only needs to be pressed down to move the probe 141 to a position in contact with the pole of the battery cell 4.

[0060] Since the probe 141 can move with the movable seat 1423, the distance between the probe 141 and the first accommodating cavity 121 is also adjustable. Even if the battery cell 4 changes, the probe 141 can still ensure contact with the pole of the battery cell 4 by pressing down the movable seat 1423. At the same time, when the battery cell 4 is disassembled, since the probe 141 is in a position away from the first accommodating cavity 121 under the action of the second elastic member 1424, the probe 141 will not interfere with the disassembly of the battery cell 4 and is not easy to be damaged due to the disassembly of the battery cell 4.

[0061] Optionally, the battery cell testing fixture includes a pressing mechanism 2.

[0062] Reference can be made to Figure 4 As shown, the pressing mechanism 2 includes a first moving member 21, a second moving member 22, a first driving member 23 and a second driving member 24. The first moving member 21 is in transmission connection with the power output end of the first driving member 23 with the first driving member 23 as the reference to enable the first moving member 21 to move in a first direction. The second driving member 24 is fixed on the first moving member 21 to drive the second moving member 22 to move in a second direction and press down the movable seat 1423 of the mounting structure 142.

[0063] The first direction intersects with the second direction. The first direction and the second direction can be arranged at an acute angle or an obtuse angle, or can be arranged orthogonally. In the embodiment, the second direction is a vertical direction, and the first direction is any horizontal direction.

[0064] Specifically, reference can be made to Figure 1 As shown, the battery cell test fixture has a plurality of fixed plates 1 arranged in a stack. Reference can be made to Figure 4 As shown, the first driving member 23 is provided with two, and is arranged on both sides of the stacked fixed plates 1 along the stacking direction. The first driving member 23 can be a pneumatic cylinder, an electric cylinder or a hydraulic cylinder, etc., and a second guide rail for guiding the first moving member 21 can be arranged beside the first driving member 23. The first moving member 21 is in a beam-like structure, and both ends thereof are fixedly connected with the power output ends of the first driving member 23, and is movably mounted on the second guide rail. The first moving member 21 is fixedly provided with a second driving member 24, which can be a pneumatic cylinder, an electric cylinder or a hydraulic cylinder, etc. The power output end of the second driving member 24 is fixedly connected with a second moving member 22. In this embodiment, the second moving member 22 is in a plate-like structure. A guide structure can be arranged between the first moving member 21 and the third moving member, which can be a guide sleeve fixed on the first moving member 21 and a guide shaft fixed on the second moving member 22. The guide shaft is inserted into the guide sleeve.

[0065] Under the driving of the first driving member 23, the first moving member 21 can drive the second moving member 22 and the second driving member 24 to move to a position directly opposite the movable seat 1423 of the mounting structure 142. Since the second direction is towards the movable seat 1423, under the driving of the second driving member 24, the second moving member 22 moves towards the mounting seat to press the mounting seat, so that the probe 141 on the mounting seat can contact the pole of the battery cell 4.

[0066] Optionally, reference can be made to Figure 3 As shown, the movable seat 1423 further comprises a roller 14231. The roller 14231 is arranged on the side of the main body of the movable seat 1423 facing the second moving member 22, so as to contact the second moving member 22 when the second moving member 22 moves towards the movable seat 1423. In this way, even when the pressing mechanism 2 exerts pressure on the movable seat 1423 of the fixed plate 1, the pressing mechanism 2 will not interfere with the movement of the fixed plate 1. In other words, the movement of the fixed plate 1 can be synchronized with the pressing of the pressing mechanism 2, so that the fixed plate 1 can be adjusted to the position for capacity test as soon as possible. In this way, the adjustment time of the battery cell test fixture can be shortened, and the test efficiency of the capacity test of the battery cell 4 can be improved.

[0067] Embodiment 2 of the battery cell test fixture described in the present application:

[0068] Embodiment 2 of the battery cell test fixture described in the present application is a further improvement based on the foregoing embodiment 1. In this embodiment, the fixed plate 1, the pressing mechanism 2, etc. remain the same as in the foregoing embodiment 1. The key of this embodiment compared with embodiment 1 is that the battery cell test fixture described in this embodiment comprises a pressing mechanism 3.

[0069] The pressing mechanism 3 in the embodiment specifically comprises a first rack 31, a second rack 32, a guide rod 33 and a driving assembly 34. The specific shape of the first rack 31 and the second rack 32 can be set according to actual needs. In the embodiment, the first rack 31 and the second rack 32 can be a box structure enclosed by a plate. The first rack 31 and the second rack 32 are arranged in opposite spaced relation, and the guide rod 33 is arranged between the first rack 31 and the second rack 32. Specifically, reference can be made to Figure 5 The first end of the guide rod 33 is fixedly connected with the first rack 31, and the second end of the guide rod 33 is fixedly connected with the second rack 32. At least two of the fixing plates 1 are stacked along the axial direction of the guide rod 33 and movably mounted on the guide rod 33. The number of the fixing plates 1 stacked on the guide rod 33 can be set according to actual needs, and specifically can be two, three or even more. In this way, the number of the fixing plates 1 can be increased or decreased according to the processing needs of different models of the battery cell 4. In order to facilitate cooperation with the guide rod 33, one connecting structure can be fixedly arranged on each side of the fixing plate 1, and two through holes are respectively arranged on the connecting structure and penetrate the connecting structure along the thickness direction of the fixing plate 1. Reference can be made to Figure 1 As shown in the figure, the guide rod 33 also has four corresponding through holes arranged on the fixing plate 1. The guide rod 33 penetrates the corresponding through holes on the fixing plate 1, so that the fixing plate 1 can slide on the guide rod 33 along the axial direction of the guide rod 33.

[0070] The driving assembly 34 is mounted on at least one of the first rack 31 and the second rack 32. The power output end of the driving assembly 34 is in transmission connection with the fixing plate 1 and provides the fixing plate 1 with a pressing force in the axial direction of the guide rod 33. Under the action of the driving assembly 34, the fixing plates 1 are stacked and pressed together along the axial direction of the guide rod 33, and the battery cell 4 fixed on the fixing plate 1 is subjected to the pressing force exerted by the adjacent fixing plate 1, so that the battery cell 4 is not prone to adverse deformation such as bulging during charging and discharging.

[0071] Optionally, the driving assembly 34 specifically comprises a driving motor 341, a lead screw 342 and a driving plate 343.

[0072] Reference can be made to Figure 5 As shown in the figure, the driving motor 341 and the transmission assembly are arranged on the first rack 31. The power output end of the driving motor 341 is in transmission connection with the first end of the lead screw 342. Specifically, the transmission assembly can be used to realize the transmission connection between the power input end of the driving motor 341 and the first end of the lead screw 342, that is, the power output end of the driving assembly 34 is in transmission connection with the power input end of the transmission assembly, and the power output end of the transmission assembly is in transmission connection with the first end of the lead screw 342. Alternatively, the power output end of the driving motor 341 can be directly fixedly and coaxially connected with the first end of the lead screw 342.

[0073] In the embodiment, the transmission assembly can be a gear set. The gear set includes a first gear, a second gear and a third gear. The power output end of the driving motor 341 is in transmission connection with the first gear, so that the torque output by the driving motor 341 can act on the first gear and drive the first gear to rotate. The first gear is in meshing connection with the second gear, the second gear is in meshing connection with the third gear, and the third gear is coaxially fixed with the lead screw 342, so that the third gear and the lead screw 342 can synchronously rotate. Under the action of the gear set, the torque output by the driving motor 341 can be converted into a predetermined torque for driving the lead screw 342 to rotate, so that the lead screw 342 can rotate according to the required parameters. It should be noted that the specific structure of the gear set can be determined according to actual needs. For example, the gear set can only include the first gear and the second gear. The first gear is in transmission connection with the power output end of the driving motor 341, the second gear is in meshing connection with the first gear, and the second gear is coaxially fixed with the lead screw 342 and synchronously rotates. Alternatively, a fourth gear, a fifth gear or the like can be added to the transmission path of the gear set. The transmission assembly can also adopt other transmission structures according to needs. For example, the transmission assembly can also be a belt and pulley. That is, one pulley is coaxially fixed with the lead screw 342, another pulley is coaxially fixed with the power output end of the driving motor 341, and a belt is wound around the two pulleys to transmit torque.

[0074] The first end of the lead screw 342 is rotatably installed on the first rack 31, and the second end of the lead screw 342 is rotatably installed on the second rack 32. The driving plate 343 is movably installed on the guide rod 33 and is in threaded connection with the lead screw 342. After the battery cell 4 is clamped to the battery cell testing fixture, the power output end of the driving motor 341 outputs torque and drives the lead screw 342 to rotate. At this time, the driving plate 343 which is in threaded connection with the lead screw 342 moves axially along the guide rod 33 and drives the fixed plate 1 to move axially along the guide rod 33 towards the second rack 32. The transmission of the lead screw 342 is stable, which can enable the driving plate 343 to apply pressure to the fixed plate 1 evenly. At the same time, the threaded connection between the lead screw 342 and the driving plate 343 has good self-locking effect, which can ensure the reliability of the driving plate 343 pressing the fixed plate 1.

[0075] Optionally, the side of the second rack 32 facing the fixed plate 1 is provided with a pressure sensor 35. The pressure sensor 35 can read the pressing force applied to the fixed plate 1 by the driving assembly 34, so as to enable the technician to control the magnitude of the pressing force applied to the fixed plate 1. If the pressing force is too small, the pressing force received by the fixed plate 1 is insufficient to help the battery cell 4 overcome the undesirable deformation such as bulging. If the pressing force is too large, the battery cell 4 and the fixed plate 1 are likely to be damaged. Therefore, the provision of the pressure sensor 35 is beneficial to help the technician control the pressing force applied to the fixed plate 1 within a predetermined range, so as to prevent the situation of insufficient pressing force or excessive pressing force from occurring.

[0076] Embodiment 3 of the battery cell testing fixture described in the application:

[0077] The embodiment 3 of the battery cell test fixture described in the present application is a further improvement based on the aforementioned embodiment 2. Compared with embodiment 2, the pressing mechanism 2, the technical mechanism and the like in the present embodiment remain the same as embodiment 2, and the key lies in that the present embodiment adds a temperature probe 15 to the fixing plate 1 described in the aforementioned embodiment 2.

[0078] Specifically, referring to Figure 2 As shown, the first base 11 of the fixing plate 1 is provided with a temperature probe 15. The temperature probe 15 can monitor the temperature of the fixing plate 1 and the battery cell 4 on the fixing plate 1 in real time during the capacity test, and send a temperature signal to the outside world. The battery cell 4 needs to be repeatedly charged and discharged during the capacity test, which will cause a large amount of heat of the battery cell 4. When the heat accumulates to a certain extent, the battery cell 4 is prone to fire and explosion. The temperature probe 15 can help the technician to master the temperature of the battery cell 4 in real time, so as to facilitate the technician to take timely measures when the battery cell 4 is overheated, thereby reducing or even eliminating the risk of fire and explosion of the battery cell 4 during the capacity test.

[0079] In order to further reduce the risk of fire and explosion of the battery cell 4 during the capacity test, the first base 11 can be a liquid cooling plate. In other words, referring to Figure 6 As shown, the first base 11 is provided with a flow channel 16; the surface of the first base 11 is provided with an inlet 17 and an outlet 18 which are in communication with the flow channel 16. The inlet 17 is used for flowing the coolant into the flow channel 16, and the outlet 18 is used for flowing the coolant out of the flow channel 16. In the present embodiment, the coolant can be a liquid coolant, such as cold water or cold oil and the like, or a gaseous coolant, such as cold air and the like. Referring to Figure 1 In order to provide the coolant to the first base 11, in the present embodiment, the battery cell test fixture can further include a pipeline 5 which is in communication with an external coolant supply device. Specifically, the pipeline 5 includes a main inflow pipeline and a main outflow pipeline. The main inflow pipeline is provided with a main inlet which is in communication with the external coolant supply device, and the main outflow pipeline is provided with a main outlet which is in communication with the external coolant supply device. When the fixing plate 1 is arranged with a plurality of battery capacity test fixtures, the main inflow pipeline can be in communication with the inlet 17 on each fixing plate 1, and the main outflow pipeline can be in communication with the outlet 18 on each fixing plate 1. The coolant enters the flow channel 16 inside the first base 11 of the fixing plate 1 through the inlet 17, absorbs the heat on the fixing plate 1, and then flows out of the fixing plate 1 through the outlet 18. Since each fixing plate 1 has a flow channel 16 inside, the heat on the battery cell 4 can be taken away by circulating the coolant in the first base 11, thereby eliminating the safety hazards such as fire and explosion of the battery cell 4 caused by excessive heat of the battery cell 4.

[0080] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application.

[0081] The terms "first", "second" in the description of the present application and claims can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "at least two" is two or more than two. In addition, "and / or" in the description and claims indicates at least one of the connected objects, and the character " / ", generally indicates that the front and rear associated objects are in a "or" relationship.

[0082] In the description of the present application, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "left", "right", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying 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 limiting the present application.

[0083] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0084] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the description of the present application, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or at least two embodiments or examples in a suitable manner.

[0085] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the present application.

Claims

1. An electric cell test fixture, characterized by, The fixing plate (1) comprises a first base (11) and a plurality of bearing pieces (12). The fixing plate (1) comprises a first base (11) and a plurality of bearing pieces (12). The plurality of bearing pieces (12) have the same shape structure, and a first accommodating cavity (121) for mounting an electric core (4) is formed on each of the plurality of bearing pieces (12). The target bearing piece among the plurality of bearing pieces (12) is detachably connected with the first base (11).

2. The cell test fixture of claim 1, wherein, The first base (11) is provided with a second accommodating cavity (111), and the size specification of the second accommodating cavity (111) is the same as the shape structure of the plurality of bearing pieces (12); and the bearing piece (12) is mounted in the second accommodating cavity (111).

3. The cell test fixture of claim 2, wherein, The fixing plate (1) comprises a clamping mechanism (13), and the clamping mechanism (13) comprises a fixed part (131), a movable part (132) and a first elastic piece (133). The bearing piece (12) is provided with a first guide groove (122), and the first base (11) is provided with a second guide groove (112); a first end of the second guide groove (112) is provided towards the fixed part (131), a second end of the second guide groove (112) is communicated with a first end of the first guide groove (122), and a second end of the first guide groove (122) is communicated with the first accommodating cavity (121). The movable part (132) is movably mounted in the first guide groove (122) and the second guide groove (112), the fixed part (131) is fixedly mounted on the first base (11), and the first elastic piece (133) is arranged between the fixed part (131) and the movable part (132); the first elastic piece (133) is used for pressing the movable part (132) on the electric core (4).

4. The cell test fixture of claim 1, wherein, The fixing plate (1) comprises a charging and discharging assembly (14). The charging and discharging assembly (14) comprises a probe (141) and a mounting structure (142); the probe (141) has two and is arranged at intervals, the mounting structure (142) is provided with a mounting hole (1421); along the direction of the probe (141) arranged at intervals, the mounting hole (1421) is arranged at intervals, and two probes (141) are mounted in a target mounting hole in the plurality of mounting holes (1421).

5. The cell test fixture of claim 4, wherein, The mounting structure (142) comprises a second base (1422), a movable seat (1423) and a second elastic piece (1424). The second base (1422) is fixedly mounted on the first base (11), and the second base (1422) comprises a first guide rail (14221) extending towards the first accommodating cavity (121). The movable seat (1423) is movably mounted on the first guide rail (14221), and the mounting hole (1421) is arranged on the movable seat (1423). The second elastic member (1424) is arranged between the first base (11) and the movable seat (1423); the second elastic member (1424) is used for moving the probe (141) away from the first containing cavity (121).

6. The cell test fixture of claim 5, wherein, The battery cell testing fixture comprises a pressing mechanism (2). The pressing mechanism (2) comprises a first moving member (21), a second moving member (22), a first driving member (23) and a second driving member (24). The power output end of the first driving member (23) is in transmission connection with the first moving member (21) to drive the first moving member (21) to move in a first direction; the second driving member (24) is fixed on the first moving member (21) to drive the second moving member (22) to move in a second direction and press the movable seat (1423) of the mounting structure (142); the first direction intersects with the second direction.

7. The cell test fixture of claim 6, wherein, The movable seat (1423) comprises a roller (14231) used for contacting the second moving member (22).

8. The cell test fixture of any of claims 1-7, wherein, The battery cell testing fixture comprises a pressing mechanism (3). The pressing mechanism (3) comprises a first rack (31), a second rack (32), a guide rod (33) and a driving assembly (34). The first rack (31) and the second rack (32) are oppositely arranged; the first end of the guide rod (33) is fixedly connected with the first rack (31), and the second end of the guide rod (33) is fixedly connected with the second rack (32); at least two fixing plates (1) are stacked along the axial direction of the guide rod (33) and movably mounted on the guide rod (33). The driving assembly (34) is mounted on at least one of the first rack (31) and the second rack (32), and the power output end of the driving assembly (34) is used for pressing the fixing plate (1) in the axial direction of the guide rod (33).

9. The cell test fixture of claim 8, wherein, The driving assembly (34) comprises a driving motor (341), a lead screw (342) and a driving plate (343). The driving motor (341) is arranged on the first rack (31), and the power output end of the driving motor (341) is in transmission connection with the first end of the lead screw (342). The first end of the lead screw (342) is rotatably mounted on the first rack (31), and the second end of the lead screw (342) is rotatably mounted on the second rack (32). The driving plate (343) is movably mounted on the guide rod (33) and in screw connection with the lead screw (342) to serve as the power output end of the driving assembly (34).

10. The cell test fixture of claim 8, wherein, The second rack (32) is provided with a pressure sensor (35) on the side facing the fixing plate (1).

11. The cell test fixture of any of claims 1-7, wherein, The first base (11) is provided with a temperature probe (15) used for detecting the temperature of the battery cell (4) in the first containing cavity (121).

12. The cell test fixture of any of claims 1-7, wherein, The first base (11) is provided with a flow channel (16); the surface of the first base (11) is provided with an inlet (17) and an outlet (18) which communicate with the flow channel (16), the inlet (17) is used for flowing the refrigerant into the flow channel (16), and the outlet (18) is used for flowing the refrigerant out of the flow channel (16).

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