Power battery expansion force testing device

Abstract

A power battery expansion force testing device belongs to the technical field of power battery testing, and comprises an accommodating part which is internally provided with an accommodating cavity; the power battery module is arranged in the accommodating cavity and is in contact with one end of the accommodating cavity; the propelling mechanism penetrates through one end surface, far away from the power battery module, of the accommodating part and extends into the accommodating cavity to be connected with the detection part so as to push the detection part to be in contact with the power battery module; the detection part is movably arranged in the accommodating cavity, and the detection part is positioned between the propelling mechanism and the power battery module; and the detection part is used for detecting the expansion force of the power battery module. The detection device is provided with the detection part, the pressure sensor is arranged in the detection part, one end, far away from the propelling mechanism, of the detection part is in contact with the power battery module, and the pressure sensor in the detection part is used for detecting the expansion force of the power battery module so as to obtain data of the expansion force of the battery.

Description

Technical Field

[0001] This utility model belongs to the field of power battery testing technology, and specifically relates to a power battery expansion force testing device. Background Technology

[0002] With the increasing popularity of electric vehicles, people are paying more and more attention to their safety. The power battery is the core component of an electric vehicle. During use, the power battery will expand and deform. The expansion force generated by the battery expansion can damage the battery pack tray structure and even cause the risk of fire and failure. Therefore, in the production process of power batteries, it is necessary to conduct expansion force tests on the batteries and collect expansion force data throughout the entire charge and discharge life cycle of the battery. This data is particularly important for the protection and reinforcement of the battery pack. How to stably and accurately collect battery expansion force is an urgent problem to be solved. Utility Model Content

[0003] To address the above problems, this utility model proposes a power battery expansion force testing device, comprising:

[0004] A receiving section, wherein a receiving cavity is provided within the receiving section;

[0005] A power battery module, wherein the power battery module is disposed in the receiving cavity and is in contact with one end of the receiving cavity;

[0006] A propulsion mechanism passes through the end face of the receiving part away from the power battery module and extends into the receiving cavity to connect with the detection part, so as to push the detection part to maintain contact with the power battery module;

[0007] The detection unit is movably disposed in the receiving cavity and is located between the propulsion mechanism and the power battery module; the detection unit is used to detect the expansion force of the power battery module.

[0008] Specifically, the detection unit divides the receiving cavity into a first receiving cavity and a second receiving cavity, with the power battery module disposed in the first receiving cavity and the propulsion mechanism disposed in the second receiving cavity.

[0009] Specifically, the testing department includes:

[0010] The second end plate is slidably installed in the receiving cavity, and the end of the second end plate away from the power battery module is fixedly connected to the propulsion mechanism.

[0011] A pressure sensor is fixedly installed at one end of the second end plate near the power battery module; the other end of the pressure sensor away from the second end plate is in contact with the power battery module.

[0012] Specifically, the testing department also includes:

[0013] The third end plate is slidably installed in the receiving cavity and is located between the pressure sensor and the power battery module; the two ends of the third end plate are in contact with the pressure sensor and the power battery module, respectively.

[0014] An infrared rangefinder is provided on the third end plate near the power battery module, and the infrared rangefinder is located on the outside of the power battery module.

[0015] Specifically, the promoting organizations include:

[0016] A limiting mechanism is fixedly installed inside the second receiving cavity;

[0017] A lead screw sleeve is rotatably mounted on the limiting mechanism through a receiving part; a threaded hole is provided at one end of the lead screw sleeve near the power battery module.

[0018] A lead screw is threadedly connected to the threaded hole, and the end of the lead screw away from the lead screw sleeve is fixedly connected to the detection unit.

[0019] Specifically, the limiting mechanism includes:

[0020] A stop sleeve base is fixedly installed inside the second receiving cavity;

[0021] The first bearing chamber is fixedly installed at one end of the stop sleeve base near the power battery module;

[0022] The bearing is installed inside the first bearing chamber, and the lead screw sleeve passes through the stop sleeve base and the first bearing chamber and is installed with the inner ring of the bearing.

[0023] Specifically, the limiting mechanism further includes:

[0024] A spline is provided on the outer surface of the lead screw sleeve away from the power battery module;

[0025] A semi-circular groove is provided at the end of the stop sleeve base away from the power battery module;

[0026] A stop sleeve is slidably mounted on the outer surface of the lead screw sleeve, and the stop sleeve is slidably mounted in the semi-circular groove;

[0027] A clamping block is fixedly installed between the first bearing chamber and the stop sleeve base;

[0028] A spring is sleeved on a lead screw sleeve, with one end of the spring abutting against a clamping block and the other end abutting against a stop sleeve.

[0029] Specifically, the advancing organizations also include:

[0030] The second bearing chamber is fixedly installed inside the receiving cavity, and a bearing is installed inside the second bearing chamber; the inner ring of the bearing is installed on the outer surface of the lead screw sleeve near the end of the lead screw.

[0031] A fastening nut is fitted onto the outer surface of the lead screw and is installed at one end of the second bearing housing near the power battery module.

[0032] Specifically, the bearing is a tapered roller bearing.

[0033] Specifically, the receiving portion includes:

[0034] A base plate, wherein a first end plate and a fourth end plate are respectively provided on the surface of the base plate near both ends;

[0035] A guide rod, a plurality of the guide rods are located between the first end plate and the fourth end plate, one end of the plurality of the guide rods is connected to the first end plate, and the other end passes through the detection part and is connected to the fourth end plate. The base plate, the first end plate, the fourth end plate and the guide rods form a receiving cavity.

[0036] Specifically, the base plate and the fourth end plate are insulated.

[0037] Beneficial effects:

[0038] 1. This utility model is provided with a detection unit, in which a pressure sensor is provided. The end of the detection unit away from the propulsion mechanism is in contact with the power battery module. The pressure sensor in the detection unit is used to detect the expansion force of the power battery module, thereby obtaining data on the battery expansion force.

[0039] 2. This utility model is provided with a propulsion mechanism, which is used to adjust the pre-tightening force of the contact between the detection part and the power battery module, thereby facilitating subsequent testing. At the same time, the propulsion mechanism can self-lock, thereby maintaining the pre-tightening force.

[0040] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained by means of the structures pointed out in the description, claims, and drawings. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is an axonometric view of the overall structure of one embodiment of the present invention;

[0043] Figure 2 This is a front view schematic diagram of the overall structure of one embodiment of the present utility model;

[0044] Figure 3 This is a top view schematic diagram of the overall structure of one embodiment of the present utility model;

[0045] Figure 4 This is an exploded view of the overall structure of one embodiment of the present invention;

[0046] Figure 5 This is an isometric schematic diagram of the propulsion mechanism according to one embodiment of the present invention;

[0047] Figure 6 This is an exploded schematic diagram of the propulsion mechanism according to one embodiment of the present invention;

[0048] Figure 7 This is a cross-sectional schematic diagram of the propulsion mechanism according to one embodiment of the present invention.

[0049] In the diagram, 20 is the receiving part; 1 is the base plate; 2 is the first end plate; 3 is the screw; 9 is the guide rod; and 10 is the fourth end plate.

[0050] 30. Detection unit; 5. Second end plate; 6. Pressure sensor; 7. Third end plate; 8. Infrared rangefinder;

[0051] 40. Propulsion mechanism; 401. Lead screw sleeve; 4011. Spline; 4012. Hexagonal countersunk hole; 4013. Step;

[0052] 402. Stop sleeve; 403. Stop sleeve base; 4031. Semi-circular groove;

[0053] 404. Spring; 405. Clamping block; 406. First bearing chamber; 407. Bearing; 408. Second bearing chamber; 409. Fastening nut; 410. Lead screw;

[0054] 50. Power battery module. Detailed Implementation

[0055] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0056] like Figure 1 As shown, Figure 1 This is an axonometric schematic diagram of the overall structure of one embodiment of the present invention; see reference. Figure 1 A power battery expansion force testing device includes a receiving portion 20, within which a receiving cavity is provided; a power battery module 50 is disposed in the receiving cavity and contacts one end of the receiving cavity; the power battery module 50 is formed by placing different numbers or different types of batteries between a third end plate 7 and a fourth end plate 10, and the device can test the expansion force generated by the power battery or the power battery module 50 composed of power batteries, and obtain the relationship curve between the expansion force and displacement of the power battery module 50. A pushing mechanism 40 passes through the receiving portion 20 at the end face away from the power battery module 50 and extends into the receiving cavity to connect with a detection portion 30, thereby pushing the detection portion 30 to maintain contact with the power battery module 50; the detection portion 30 is movably disposed in the receiving cavity and is located between the pushing mechanism 40 and the power battery module 50; the end of the detection portion 30 away from the pushing mechanism 40 contacts the power battery module 50, and the detection portion 30 is used to detect the expansion force of the power battery module 50. The detection unit 30 divides the receiving cavity into a first receiving cavity and a second receiving cavity. The power battery module 50 is disposed in the first receiving cavity, and the propulsion mechanism 40 is disposed in the second receiving cavity, thereby facilitating subsequent battery detection.

[0057] Specifically, by manually tightening and loosening the push mechanism 40, the detection unit 30 can be moved left and right, thereby setting different pre-tightening forces for the power battery module 50. The push mechanism 40 has a self-locking function, which can stably apply pre-tightening force to the power battery module 50.

[0058] like Figure 4 As shown, Figure 4 This is an exploded view of the overall structure of one embodiment of the present invention; see reference. Figure 4The detection unit 30 includes a second end plate 5, which is slidably installed in the receiving cavity. The end of the second end plate 5 away from the power battery module 50 is fixedly connected to the propulsion mechanism 40. Specifically, the second end plate 5 is rectangular in shape, with a through hole machined at each of its four corners. A guide rod 9 passes through the through hole, allowing the second end plate 5 to move left and right along the guide rod 9. The second end plate 5 is used to limit the lead screw 410 and prevent it from rotating. A pressure sensor 6 is fixedly installed at the end of the second end plate 5 near the power battery module 50. The end of the pressure sensor 6 away from the second end plate 5 is in contact with the power battery module 50. The pressure sensor 6 can collect the expansion force generated by the power battery module 50 and the preload force generated during the tightening process of the propulsion mechanism 40 in real time.

[0059] In the above embodiment, another optional implementation is that the detection unit 30 further includes: a third end plate 7, which is slidably installed in the receiving cavity and located between the pressure sensor 6 and the power battery module 50; the two ends of the third end plate 7 are in contact with the pressure sensor 6 and the power battery module 50 respectively; the third end plate 7 is rectangular in shape, with a through hole processed at each of the four corners, through which the guide rod 9 passes, allowing the third end plate 7 to move left and right along the guide rod 9; an infrared rangefinder 8 is provided at the end of the third end plate 7 near the power battery module 50, and the infrared rangefinder 8 is located on the outside of the power battery module 50. The symmetrical arrangement of two infrared rangefinders 8 can accurately measure the deformation displacement of the power battery module 50, reducing the error of unilateral ranging, that is, it can collect the distance between the third end plate 7 and the fourth end plate 10 in real time, thereby monitoring the change in the expansion displacement of the power battery module 50, and combining the expansion force detected by the pressure sensor 6, the relationship between the expansion force and the expansion displacement can be obtained. (Combined with...) Figure 2 and Figure 3 The third end plate 7 and the fourth end plate 10 are parallel, so the movement of the third end plate 7 facilitates detection by the infrared rangefinder 8.

[0060] Preferably, the third end plate 7 is made of insulating material or is treated with insulation.

[0061] like Figure 5 As shown, Figure 5 This is an isometric schematic diagram of the propulsion mechanism 40 according to an embodiment of the present invention; see reference. Figure 5The propulsion mechanism 40 includes a limiting mechanism, which is fixedly installed on the inner surface of the receiving cavity; a lead screw sleeve 401 is rotatably mounted on the limiting mechanism through the receiving part 20; a countersunk thread hole is provided at one end of the lead screw sleeve 401 near the power battery module 50; the countersunk thread hole is a trapezoidal countersunk thread hole. A step 4013 is provided on the outer surface of the lead screw sleeve 401 near the spline 4011, the step 4013 contacts the inner ring of the bearing 407, and the clamping block 405 is located at the other end of the step 4013, thereby achieving limiting and preventing the lead screw sleeve 401 from moving left or right (e.g., ...). Figure 7 (As shown); the lead screw 410 is threadedly connected to the threaded hole, and the end of the lead screw 410 away from the lead screw sleeve 401 is fixedly connected to the detection part 30. The lead screw 410 is a trapezoidal lead screw. Since the lead screw 410 is welded to the second end plate 5, it can only move left and right and cannot rotate.

[0062] Furthermore, the limiting mechanism includes a stop sleeve base 403, which is fixedly mounted on the inner surface of the receiving cavity by screws 3; and a first bearing chamber 406, which is fixedly mounted on one end of the stop sleeve base 403 near the power battery module 50. Specifically, the first bearing chamber 406 is mounted on the stop sleeve base 403 by screws 3 and presses against the clamping block 405. A bearing 407 is installed inside the first bearing chamber 406, and a lead screw sleeve 401 passes through the stop sleeve base 403 and the first bearing chamber 406, and is installed with the inner ring of the bearing 407. The bearing 407 is used to limit the lead screw sleeve 401 and bear axial force, and can also bear radial force.

[0063] like Figure 6 As shown, Figure 6 This is an exploded schematic diagram of the propulsion mechanism 40 according to an embodiment of the present invention; Reference Figure 6 A countersunk hole 4012 is provided at the end of the lead screw sleeve 401 away from the lead screw 410, and a spline 4011 is provided on the outer surface of the lead screw sleeve 401 away from the power battery module 50; specifically, a spline 4011 arranged around the axis of the lead screw sleeve 401 is provided on the outer surface of the lead screw sleeve 401 away from the power battery module 50, and a wrench can drive the propulsion mechanism 40 through the countersunk hole 4012; a stop sleeve base 403 is located away from the power battery module 50. One end of the battery module 50 is provided with a semi-circular groove 4031; the stop sleeve 402 is slidably installed on the outer surface of the lead screw sleeve 401, and the stop sleeve 402 is slidably installed in the semi-circular groove 4031; the clamping block 405 is fixedly installed between the first bearing chamber 406 and the stop sleeve base 403; the spring 404 is sleeved on the lead screw sleeve 401, and one end of the spring 404 abuts against the clamping block 405, and the other end abuts against the stop sleeve 402.

[0064] It should be noted that when the lead screw sleeve 401 rotates, the limiting mechanism limits the lead screw sleeve 401, preventing it from moving left or right. The lead screw sleeve 401 then transmits its rotation to the lead screw 410 via the thread. Since the lead screw 410 cannot rotate, it can move left or right. The lead screw sleeve 401 has a spline 4011 feature machined on the outer side near the internal hexagonal countersunk hole 4012, which mates with the spline sleeve feature of the inner ring of the stop sleeve 402, thereby locking the lead screw sleeve 401. The outer ring of the stop sleeve 402 has a symmetrical semi-circular notch feature, allowing it to move left or right along the semi-circular groove 4031 of the stop sleeve base 403.

[0065] Specifically, when preload is required, a wrench is inserted into the hexagonal countersunk hole 4012 and pressed to move the stop sleeve 402 toward the first bearing chamber 406, thereby disengaging the spline sleeve of the stop sleeve 402 from the spline 4011 on the lead screw sleeve 401. The wrench is then turned to rotate the lead screw sleeve 401, which in turn causes the lead screw 410 to move to adjust the preload of the pressure sensor 6 and the power battery module 50. When the target preload is reached, the stop sleeve 402 is released, and under the action of the spring 404, the stop sleeve 402 returns to its original position, and the spline 4011 re-engages with the spline sleeve, thus completing the locking of the lead screw sleeve 401.

[0066] In the above embodiment, another optional implementation is that the propulsion mechanism 40 further includes: a second bearing chamber 408, which is fixedly installed in the receiving cavity, and a bearing 407 is installed in the second bearing chamber 408; the inner ring of the bearing 407 is installed on the outer surface of the lead screw sleeve 401 near the end of the lead screw 410; a fastening nut 409 is sleeved on the outer surface of the lead screw 410, and the fastening nut 409 is installed at the end of the second bearing chamber 408 near the power battery module 50; and is locked with the fastening nut 409; the bearing 407 is a tapered roller bearing. It can withstand both axial and radial forces.

[0067] Further, the receiving part 20 includes: a base plate 1, which is the base of the entire device and is rectangular in shape. A first end plate 2 and a fourth end plate 10 are respectively disposed on the surface of the base plate 1 near both ends; that is, the first end plate 2 and the fourth end plate 10 are vertically installed and fixed at the left and right ends of the base plate 1; a plurality of guide rods 9 are located between the first end plate 2 and the fourth end plate 10. One end of each guide rod 9 is connected to the first end plate 2, and the other end passes through the detection part 30 and connects to the fourth end plate 10. The base plate 1, the first end plate 2, the fourth end plate 10, and the guide rods 9 form a receiving cavity. Specifically, each guide rod 9 is a cylindrical rod, installed and fixed between the first end plate 2 and the fourth end plate 10, with four guide rods 9 respectively installed at the four corners of the first end plate 2 and the fourth end plate 10.

[0068] In the above embodiments, another optional implementation is that the base plate 1 and the fourth end plate 10 are made of insulating material or are treated with insulation.

[0069] Specifically, the distance between the third end plate 7 and the fourth end plate 10 can be adjusted to accommodate different numbers and models of batteries, thus enhancing the versatility of the device.

[0070] Working principle:

[0071] In use, the power battery module 50 to be tested is placed in the receiving part 20, and the power battery module 50 contacts the fourth end plate 10. By manually tightening the pushing mechanism 40, first, the stop sleeve 402 is manually pressed to disengage the spline sleeve feature of the inner ring of the stop sleeve 402 from the spline 4011 of the screw thread sleeve 401. Then, the screw thread sleeve 401 is rotated. Due to the limiting mechanism's limitation on the screw thread sleeve 401, the screw thread sleeve 401 is prevented from moving left or right, thereby allowing the screw thread sleeve to rotate. The sleeve 401 transmits rotation to the lead screw 410 through the thread. The lead screw 410 cannot rotate, which can then drive the lead screw 410 to move to clamp the power battery module 50. The stop sleeve 402 is released. Under the elastic force of the spring 404, the spline sleeve feature of the stop sleeve 402 is locked with the spline 4011 of the lead screw sleeve 401, thereby locking the lead screw sleeve 401. Then the pressure sensor 6 and the infrared rangefinder 8 record the initial data and continuously record the expansion process data of the power battery module 50.

[0072] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A power battery expansion force testing device, characterized in that, include: The receiving part (20) has a receiving cavity provided therein; A power battery module (50) is disposed in the receiving cavity and is in contact with one end of the receiving cavity; The propulsion mechanism (40) passes through the end face of the receiving part (20) away from the power battery module (50) and extends into the receiving cavity to connect with the detection part (30) so as to push the detection part (30) to keep in contact with the power battery module (50); The detection unit (30) is movably disposed in the receiving cavity and is located between the propulsion mechanism (40) and the power battery module (50); the detection unit (30) is used to detect the expansion force of the power battery module (50); The detection unit (30) divides the accommodating cavity into a first accommodating cavity and a second accommodating cavity, and the propulsion mechanism (40) is disposed in the second accommodating cavity; The propulsion mechanism (40) includes a limiting mechanism, which is fixedly installed inside the second receiving cavity; The limiting mechanism includes a spline (4011) on the outer surface of the lead screw sleeve (401) away from the power battery module (50). A semi-circular groove (4031) is provided at one end of the stop sleeve base (403) away from the power battery module (50); A stop sleeve (402) is slidably mounted on the outer surface of the lead screw sleeve (401) and slidably mounted in the semi-circular groove (4031); A clamping block (405) is fixedly installed between the first bearing chamber (406) and the stop sleeve base (403); A spring (404) is sleeved on a lead screw sleeve (401), with one end of the spring (404) abutting against a pressing block (405) and the other end abutting against a stop sleeve (402).

2. The power battery expansion force testing device according to claim 1, characterized in that, The power battery module (50) is disposed in the first receiving cavity.

3. A power battery expansion force testing device according to claim 1 or 2, characterized in that, The testing department (30) includes: The second end plate (5) is slidably installed in the cavity, and the end of the second end plate (5) away from the power battery module (50) is fixedly connected to the propulsion mechanism (40); Pressure sensor (6) is fixedly installed on the end of the second end plate (5) near the power battery module (50); the end of the pressure sensor (6) away from the second end plate (5) is in contact with the power battery module (50).

4. The power battery expansion force testing device according to claim 3, characterized in that, The testing department (30) also includes: The third end plate (7) is slidably installed in the receiving cavity and is located between the pressure sensor (6) and the power battery module (50). The two ends of the third end plate (7) are in contact with the pressure sensor (6) and the power battery module (50) respectively. An infrared rangefinder (8) is provided on the third end plate (7) near the power battery module (50), and the infrared rangefinder (8) is located on the outside of the power battery module (50).

5. The power battery expansion force testing device according to claim 2, characterized in that, The propulsion mechanism (40) also includes: A lead screw sleeve (401) is rotatably mounted on the limiting mechanism through the receiving part (20); a threaded hole is provided at one end of the lead screw sleeve (401) near the power battery module (50); The lead screw (410) is threadedly connected to the threaded hole, and the end of the lead screw (410) away from the lead screw sleeve (401) is fixedly connected to the detection part (30).

6. The power battery expansion force testing device according to claim 5, characterized in that, The limiting mechanism includes: A stop sleeve base (403) is fixedly installed inside the second receiving cavity; The first bearing housing (406) is fixedly installed at one end of the stop sleeve base (403) near the power battery module (50); The bearing (407) is installed inside the first bearing chamber (406), and the lead screw sleeve (401) passes through the stop sleeve base (403) and the first bearing chamber (406) and is installed with the inner ring of the bearing (407).

7. A power battery expansion force testing device according to claim 5 or 6, characterized in that, The propulsion mechanism (40) also includes: The second bearing chamber (408) is fixedly installed in the receiving cavity, and a bearing (407) is installed in the second bearing chamber (408); the inner ring of the bearing (407) is installed on the outer surface of the lead screw sleeve (401) near the end of the lead screw (410); A fastening nut (409) is sleeved on the outer surface of the lead screw (410) and the fastening nut (409) is installed at one end of the second bearing chamber (408) near the power battery module (50).

8. The power battery expansion force testing device according to claim 7, characterized in that, The bearing (407) is a tapered roller bearing.

9. The power battery expansion force testing device according to claim 1, characterized in that, The receiving portion (20) includes: The base plate (1) has a first end plate (2) and a fourth end plate (10) respectively provided on the surface of the base plate (1) near both ends. The guide rod (9) is located between the first end plate (2) and the fourth end plate (10). One end of the guide rod (9) is connected to the first end plate (2), and the other end passes through the detection part (30) and is connected to the fourth end plate (10). The base plate (1), the first end plate (2), the fourth end plate (10) and the guide rod (9) form a receiving cavity.

10. A power battery expansion force testing device according to claim 9, characterized in that, The base plate (1) and the fourth end plate (10) are insulated.

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