CN211698110U - Battery stress testing device - Google Patents

Abstract

The utility model relates to a lithium cell capability test field provides a battery stress test device, include: a mounting frame; the lower pressing plate is installed on the installation frame, and a lower insulation plate is arranged at the top of the lower pressing plate; the upper pressure plate is connected with the mounting frame through a driving mechanism, and an upper insulating plate is arranged at the bottom of the upper pressure plate; the driving mechanism drives the upper pressure plate to move so that the upper insulating plate moves towards or away from the lower insulating plate, the lower pressure plate is provided with a pressure sensor, and the upper insulating plate is provided with a displacement sensor. An object of the utility model is to provide a battery stress test device to at least, the realization can make lithium ion laminate polymer battery carry out normal position stress test under the invariable displacement state, research power is to the influence of battery performance.

Description

Battery stress test device

technical field

The utility model relates to the field of lithium battery performance testing, in particular to a battery stress testing device.

Background technique

The external stress to which a lithium-ion battery is subjected has a significant impact on its charge-discharge performance. Lithium batteries have a certain volume expansion effect during the charging and discharging process. After the batteries are grouped, they are subject to the restraint pressure of the module. At the same time, the expansion of the battery gives a certain pressure to the module. It is of great significance to study the stress environment for the optimal battery performance for the battery and the module.

The technical solution disclosed in the Chinese utility model patent with publication number CN 209470684 U is a representative thickness measurement device solution in the current industry. The device includes a frame, a test platform arranged on the frame, a pressure applying mechanism and a thickness measuring mechanism. The linear power device is composed of a straight stroke cylinder, and the upper fixed plate is constructed with a fixed plate sliding guide rod. The device realizes cell thickness measurement under constant pressure.

In fact, the device is powered by a cylinder, and the pressure is constant for a single measurement, and the stress change of the battery under constant displacement cannot be measured in-situ; and the upper and lower pressure plates are installed independently, which requires high installation and processing level, and the flatness of the upper and lower pressure plates is not suitable. Adjustment.

Utility model content

In order to solve the defects existing in the prior art, the purpose of the present invention is to provide a battery stress test device, so as to at least realize the in-situ stress test of the lithium ion soft pack battery under a constant displacement state, and to study the influence of force on the battery performance. .

According to an embodiment of the present invention, a battery stress testing device is provided, comprising: an installation frame; a lower pressing plate, which is installed on the installation frame and has a lower insulating plate on the top; and an upper pressing plate, which is connected to the installation by a driving mechanism The frame and the bottom are provided with an upper insulating plate; wherein, the driving mechanism drives the upper pressing plate to move, so as to move the upper insulating plate toward or away from the lower insulating plate, and a pressure sensor is arranged on the lower pressing plate, and A displacement sensor is arranged on the upper insulating plate.

According to an embodiment of the present invention, the displacement sensor is mounted on the side surface of the upper insulating plate through a displacement sensor bracket, and a displacement sensor positioning plate opposite to the displacement sensor is provided on the lower pressing plate.

According to an embodiment of the present invention, the pressure sensor is mounted on the bottom surface of the lower pressing plate through a sensor pressing plate.

According to an embodiment of the present invention, the driving mechanism includes a lead screw, one end of the lead screw is located outside the mounting frame, and the other end passes through the mounting frame and is connected to the upper pressing plate, wherein the screw The lever is mounted on the mounting frame through the first bushing.

According to an embodiment of the present invention, a guide post is installed between the upper pressure plate and the lower pressure plate, one end of the guide column is connected to the lower pressure plate, and the other end is connected to the upper pressure plate through a second bushing.

According to an embodiment of the present invention, the mounting frame includes an upper beam and a lower beam interconnected by sliding guide posts, the lower pressing plate and the upper pressing plate are located between the upper beam and the lower beam, and the The lower pressing plate is mounted on the sliding guide column through a sliding guide sleeve.

According to an embodiment of the present invention, the upper beam and the lower beam are mounted on both ends of the sliding guide column by fasteners.

According to an embodiment of the present invention, the pressure sensor includes a spoke-type pressure sensor or a pull-type pressure sensor.

According to an embodiment of the present invention, the displacement sensor includes a contact displacement sensor or a grating displacement sensor.

According to an embodiment of the present invention, the upper insulating board and the lower insulating board include marble insulating boards or bakelite insulating boards.

The beneficial effects of the present utility model are:

In the battery stress testing device provided by the present invention, the driving mechanism can drive the upper pressure plate to move, so that the upper insulating plate moves toward or away from the lower insulating plate, and at the same time, a pressure sensor is arranged on the lower pressure plate, and a pressure sensor is arranged on the upper insulating plate. Motion detector. Compared with the traditional scheme, the utility model combines the characteristics of the lithium battery thickness measuring device to apply pressure and position the upper pressure plate through the driving mechanism, so as to achieve the purpose of constant displacement. In addition, sufficient space is reserved for the upper and lower pressing plates of the present invention, and the insulating plates can be matched and replaced according to the specifications of the test battery, so as to achieve the purpose of battery testing in the in-situ charging and discharging state.

Description of drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative efforts.

FIG. 1 is a schematic diagram of an exemplary structure of the battery stress testing device of the present invention.

Reference number:

100: battery stress testing device; 102: mounting frame; 104: lower pressing plate; 106: upper pressing plate; 108: lower insulating plate; 110: upper insulating plate; 112: pressure sensor; 114: displacement sensor; 116: displacement sensor bracket; 118: displacement sensor positioning plate; 120: sensor pressure plate; 122: lead screw; 124: first bushing; 126: guide post; 128: second bushing; 130: sliding guide post; 132: upper beam; 134: lower beam; 136: sliding guide bush; 138: bolt; B: test battery.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. The embodiments of the present invention are some of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a connectable connection. Detachable connection, or integral connection; may be mechanical connection or electrical connection; may be direct connection, or indirect connection through an intermediate medium, or internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

In addition, in the description of the present invention, unless otherwise specified, "multiple", "multiple" and "multiple groups" mean two or more, "several", "several", "several" Groups" means one or more than one.

As shown in FIG. 1 , an embodiment of the present invention provides a battery stress testing device 100 . The battery stress testing apparatus 100 may generally include a mounting frame 102 , a lower pressure plate 104 and an upper pressure plate 106 . Specifically, the lower pressing plate 104 can be installed on the mounting frame 102 and the top can be provided with a lower insulating plate 108 ; the upper pressing plate 106 can be connected to the mounting frame 102 through a driving mechanism and the bottom can be provided with an upper insulating plate 110 . Further, the driving mechanism can drive the upper pressing plate 106 to move, so that the upper insulating plate 110 moves toward or away from the lower insulating plate 108 , in addition, the lower pressing plate 104 can be provided with a pressure sensor 112 , and the upper insulating plate 110 can be provided with a displacement sensor 114.

Comparing the structure provided by the present utility model with the traditional scheme, it can be found that: compared with the traditional scheme, the traditional scheme cannot realize the in-situ stress test of the battery under the constant displacement state. The pressure plate is pressed and positioned, which can achieve the purpose of constant displacement. In addition, compared with the traditional solution, the traditional solution does not consider the in-situ requirements of charging and discharging, and charging and discharging cannot be realized in the test. The upper and lower pressing plates of the utility model have enough space reserved, and the insulating plates can be matched and replaced according to the test battery specifications, so as to achieve the purpose of battery testing in the in-situ charging and discharging state.

Further as shown in FIG. 1 , in the embodiment of the present invention, the displacement sensor 114 can be installed on the side of the upper insulating plate 110 through the displacement sensor bracket 116 , and the lower pressing plate 104 can be provided with a displacement sensor opposite to the displacement sensor 114 Positioning plate 118 . The function of the displacement sensor positioning plate 118 is for positioning and calibrating the displacement sensor 114, and the process will be described below with reference to the actual operation.

On the other hand, as shown in FIG. 1 , in one embodiment of the present invention, the pressure sensor 112 can be installed on the bottom surface of the lower pressing plate 104 through the sensor pressing plate 120 . The pressure sensor 112 is used for the pressure test of the battery in the present invention, and the process will also be described below with reference to the actual operation.

In a specific embodiment, the drive mechanism as described above may include a lead screw 122 . Specifically, one end of the lead screw 122 is located outside the mounting frame 102 (outside the top of the mounting frame 102 in the illustrated embodiment), and the other end of the lead screw 122 passes through the mounting frame 102 and is connected to the upper platen 106 , wherein the lead screw 122 can be mounted on the mounting frame 102 through the first bushing 124 . In one embodiment, the first bushing 124 can be a trapezoidal bushing; correspondingly, the lead screw 122 can be a trapezoidal lead screw.

However, it should be understood that the lead screw 122 is only an embodiment of the driving mechanism, and other suitable structures can also be used as the driving mechanism, such as a cylinder structure, an oil cylinder structure, and the like. Moreover, the specific form of the lead screw 122 and the specific form of the first bushing 124 are only schematic. In other words, the various structures described above do not constitute any particular limitation to the present invention.

1 , in an embodiment of the present invention, guide posts 126 can be installed between the upper pressing plate 106 and the lower pressing plate 104, for example, high-precision guide posts are preferred to guide the upper and lower pressing plates and the upper and lower insulating plates. parallelism between. Specifically, one end of the guide post 126 may be connected to the lower pressing plate 104 , and the other end of the guiding post 126 may be connected to the upper pressing plate 106 through the second bushing 128 . In one embodiment, the second bushing 128 can be a ball bushing; however, it should be understood that the selection of the second bushing 128 is only illustrative, and does not constitute any particular limitation to the present invention, and may be selected according to specific circumstances An appropriate type of second bushing 128 is selected.

For the mounting frame 102 , in one embodiment, as shown in FIG. 1 , the mounting frame 102 may include an upper beam 132 and a lower beam 134 interconnected by sliding guide posts 130 . Specifically, the lower pressing plate 104 and the upper pressing plate 106 can be located between the upper beam 132 and the lower beam 134 to form the structure shown in FIG. 1 , and the lower pressing plate 104 can be installed on the sliding guide post 130 through the sliding guide sleeve 136 . In an optional embodiment, the upper beam 132 and the lower beam 134 may be installed on both ends of the sliding guide column 130 by fasteners. In the embodiment, for example, the fasteners may be bolts 138; however, it should be understood that the connection between the upper beam 132 and the lower beam 134 and the sliding guide column 130 may also adopt other appropriate connection methods, and the bolt connection is only the present An embodiment of the utility model does not constitute any special limitation to the present utility model. In a specific embodiment, the upper beam 132 and the lower beam 134 are connected as sliding guide posts 130 , and the lower pressing plate 104 and the sliding guide posts 130 are guided by linear bearings, which reduces the influence of friction on the pressure sensor.

In an optional embodiment, the pressure sensor 112 may include a spoke-type pressure sensor or a pull-type pressure sensor, and the range of the pressure sensor 112 may be in the range of 100kg-10000kg. In addition, the displacement sensor 114 may include a contact type displacement sensor or a grating type displacement sensor, and the range of the displacement sensor 114 may be in the range of 0˜50 mm. The displacement sensor can be selected according to the test accuracy requirements. If the test accuracy is less than 1um, the contact sensor is preferred; if it is higher than 1um, the grating sensor is preferred. Further, the upper insulating board 110 and the lower insulating board 108 may include marble insulating boards or bakelite insulating boards, so as to ensure that the battery will not be short-circuited during battery testing.

It should be understood here that the type of the pressure sensor 112, the type of the displacement sensor 114, and the types of the upper insulating plate 110 and the lower insulating plate 108 can be selected according to actual conditions. That is to say, the above description is only an exemplary embodiment of the present invention, and does not constitute any particular limitation to the present invention.

In addition, in an optional embodiment, the thickness of the upper insulating plate 110 and the lower insulating plate 108 may be in the range of 5-50 mm, and the upper insulating plate 110 and the lower insulating plate 108 may be replaced as required. The choice of thickness is based on the maximum test pressure and the size of the battery. The upper insulating plate 110 and the lower insulating plate 108 can be replaced, and the replacement is based on the battery specification.

Similar to the above, the upper beam 132 , the lower beam 134 , the upper pressing plate 106 and the lower pressing plate 104 may be made of steel plates because the steel plates have sufficient rigidity. In addition, the upper beam 132 , the lower beam 134 , the upper pressing plate 106 and the lower pressing plate 104 are the main stress components, and the thickness of their steel plates can be in the range of 5-50 mm. In a specific embodiment, the upper beam 132 and the lower beam 134 are preferably nickel-plated steel plates to achieve aesthetic and anti-corrosion purposes; the upper pressure plate 106 and the lower pressure plate 104 are preferably steel plate chrome-plated to achieve bright and beautiful appearance, increased hardness and wear resistance. Purpose. In addition, the selection of the thickness of the steel plate is determined according to the maximum test pressure and the size of the battery to ensure that the stiffness of the steel plate meets the test requirements.

In the actual use process of the present utility model, the pre-tightening force is generated by the driving mechanism (such as the lead screw 122) rotating and descending, and the pre-tightening force is gradually added to the upper and lower pressing plates, the upper and lower insulating plates and the battery from small to large. Reduce the impact on the battery and ensure the accuracy and stability of the predicted preload.

Specifically, the use method of the battery stress testing device 100 provided by the embodiment of the present invention is as follows:

Confirm that the upper insulating plate 110 and the lower insulating plate 108 are suitable for the test battery specifications, and the upper insulating plate 110 and the lower insulating plate 108 are in close contact by rotating the screw 122 to reset the displacement sensor 114 to zero. Then, the upper insulating plate 110 and the lower insulating plate 108 are separated to a distance where the test battery B can be accommodated.

Next, the lithium ion soft pack battery as the test battery B is placed on the lower insulating plate 108 , and the battery tabs are protruded from the lower insulating plate 108 at the same time.

Then, the upper insulating plate 110 and the lower insulating plate 108 are in close contact with the battery by rotating the lead screw 122, and the displayed values of the displacement sensor 114 and the pressure sensor 112 are observed. When the displacement or pressure required by the experiment is reached, the rotating lead screw 122 is stopped.

Next, connect the positive and negative poles of the external charging and discharging equipment fixture to the positive and negative poles of the battery, respectively, and start the charging and discharging equipment for testing.

Finally, the displacement sensor 114 and the pressure sensor 112 are connected to the computer, and displacement and pressure data are collected through corresponding collection software.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, but not to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the spirit of the technical solutions of the embodiments of the present invention and range.

Claims (10)

1. a battery stress testing device, is characterized in that, comprises: mounting frame; a lower pressing plate, mounted on the mounting frame and provided with a lower insulating plate on the top; an upper pressing plate, which is connected to the mounting frame through a driving mechanism and is provided with an upper insulating plate at the bottom; Wherein, the driving mechanism drives the upper pressing plate to move, so that the upper insulating plate moves toward or away from the lower insulating plate, a pressure sensor is arranged on the lower pressing plate, and a displacement is arranged on the upper insulating plate sensor. 2 . The battery stress testing device according to claim 1 , wherein the displacement sensor is mounted on the side of the upper insulating plate through a displacement sensor bracket, and the lower pressing plate is provided with a position opposite to the displacement sensor. 3 . The displacement sensor positioning plate. 3 . The battery stress testing device according to claim 1 , wherein the pressure sensor is mounted on the bottom surface of the lower pressing plate through a sensor pressing plate. 4 . 4. The battery stress testing device according to any one of claims 1 to 3, wherein the driving mechanism comprises a lead screw, one end of the lead screw is located outside the mounting frame, and the other end passes through the The mounting frame is connected to the upper pressing plate, wherein the lead screw is mounted on the mounting frame through a first bushing. 5 . The battery stress testing device according to claim 1 , wherein a guide post is installed between the upper pressure plate and the lower pressure plate, and one end of the guide post is connected to the lower pressure plate. 6 . The pressing plate, the other end of which is connected to the upper pressing plate through a second bushing. 6. The battery stress testing device according to any one of claims 1 to 3, wherein the mounting frame comprises an upper beam and a lower beam interconnected by sliding guide posts, the lower pressing plate and the upper The pressing plate is located between the upper beam and the lower beam, and the lower pressing plate is mounted on the sliding guide column through a sliding guide sleeve. 7 . The battery stress testing device according to claim 6 , wherein the upper beam and the lower beam are mounted on both ends of the sliding guide column by fasteners. 8 . 8 . The battery stress testing device according to claim 1 , wherein the pressure sensor comprises a wheel-spoke pressure sensor or a pull-out pressure sensor. 9 . 9 . The battery stress testing device according to claim 1 , wherein the displacement sensor comprises a contact displacement sensor or a grating displacement sensor. 10 . 10 . The battery stress testing device according to claim 1 , wherein the upper insulating board and the lower insulating board comprise marble insulating boards or bakelite insulating boards. 11 .

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