Puncture test device for testing internal temperature of battery

Abstract

The utility model discloses a needling test device for testing the internal temperature of a battery, which comprises a needling mechanism, a temperature measuring mechanism and a movement mechanism, the movement mechanism comprises a movement platform, a first movable frame, a second movable frame, a first linear driving mechanism and a second linear driving mechanism, and the needling mechanism comprises a hollow probe. One side of the motion platform is connected with the first movable frame and the second movable frame through a first linear driving mechanism and a second linear driving mechanism respectively; the second movable frame is arranged above the first movable frame, a hollow probe and a temperature measuring mechanism are arranged on one side of the first movable frame and one side of the second movable frame respectively, and the free end of the temperature measuring mechanism penetrates through the first movable frame and extends into a cavity in the hollow probe. The hollow probe and the temperature sensor can move relative to each other, so that the temperature sensor can flexibly stay at any position in the battery in the advancing direction of the probe, temperature change information in the battery is further obtained, and good practicability is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery puncture test equipment, and in particular relates to a puncture test device for testing the internal temperature of a battery. Background Art

[0002] With the widespread application of batteries in energy storage, new energy vehicles and other industries, the demand for their energy density is getting higher and higher, and the resulting safety risks are also getting higher and higher. Therefore, in order to study the safety performance of batteries, the industry has formulated a number of safety tests, among which the needle puncture test is a relatively strict test. It simulates the situation where the battery is pierced by a sharp object and observes whether sparks, explosions, etc. will occur to determine the risk level of the battery. At the same time, the battery temperature and voltage data will be recorded during the test to facilitate the prevention and treatment of battery thermal runaway before and after.

[0003] At present, when collecting temperature data of the battery during acupuncture, the temperature sensor is generally attached to different positions on the surface of the battery. In this way, only the temperature information on the surface of the battery can be collected, and the measurement accuracy is poor. Secondly, there is a method in the prior art to place the temperature sensor in the hollow cavity inside the probe to collect the temperature information inside the battery, and to control the stroke of the probe to keep the temperature sensor at the target position inside the battery. However, the relative position of the temperature sensor and the probe is fixed, and it is impossible to accurately test the temperature at any position outside the probe. Utility Model Content

[0004] The purpose of the utility model is to provide a needle puncture test device for testing the internal temperature of a battery, aiming to solve the above-mentioned problem. The utility model realizes that during the needle puncture process, the probe and the temperature sensor can move relative to each other, so that the temperature sensor can flexibly stay at any position inside the battery in the direction of the probe, thereby obtaining the temperature change information inside the battery, which has good practicality.

[0005] The utility model is mainly realized through the following technical solutions:

[0006] A needle puncture test device for testing the internal temperature of a battery comprises a needle puncture mechanism, a temperature measuring mechanism and a motion mechanism, wherein the motion mechanism comprises a motion platform, a first movable frame, a second movable frame, a first linear drive mechanism and a second linear drive mechanism, wherein the needle puncture mechanism comprises a hollow probe, wherein one side of the motion platform is connected to the first movable frame and the second movable frame respectively through the first linear drive mechanism and the second linear drive mechanism; the second movable frame is arranged above the first movable frame, and one side of the first movable frame and the second movable frame is respectively provided with a hollow probe and a temperature measuring mechanism, wherein the first linear drive mechanism is used to drive the first movable frame to move linearly and drive the hollow probe to be inserted into the battery, and the second linear drive mechanism is used to drive the second movable frame to move linearly and drive the free end of the temperature measuring mechanism to pass through the first movable frame and extend into the cavity inside the hollow probe to achieve temperature measurement.

[0007] In order to better realize the utility model, further, a needle seat is provided at the bottom of the first movable frame, a hollow probe is detachably installed in the needle seat, and a pressure sensor is provided between the needle seat and the hollow probe, and the middle of the first movable frame and the needle seat are respectively provided with through holes that penetrate the internal cavity of the hollow probe for the temperature measuring mechanism to pass through.

[0008] In order to better realize the utility model, further, a fixing seat is provided at the bottom of the second movable frame, and the fixing seat is detachably connected to the temperature measuring mechanism.

[0009] In order to better realize the utility model, further, the temperature measuring mechanism includes a guide rod, a temperature sensor and a limit part, the middle part of the guide rod is provided with an installation cavity, and the bottom is installed with a limit part; the temperature sensor is installed in the installation cavity, and the bottom is clamped with the limit part, the temperature measuring point at the bottom of the temperature sensor is in contact with the limit part, and the limit part is made of heat conductive material.

[0010] In order to better realize the utility model, further, the limiting part is a boss structure, the top of the limiting part is snap-fitted with the installation cavity, and a snap-fit ​​groove is provided in the middle of the top of the limiting part corresponding to the temperature sensor.

[0011] In order to better realize the utility model, further, the temperature sensor is a thermocouple sensor, and the top is connected to the controller through a signal transmission line.

[0012] In order to better realize the utility model, it further includes a base, guide rails are respectively arranged on both sides of the base, both ends of the first movable frame are respectively slidably connected to the guide rails, a battery is placed in the middle of the base corresponding to the hollow probe, and a puncture channel is arranged on the bottom side wall corresponding to the hollow probe.

[0013] In order to better realize the present utility model, further, the first linear drive mechanism and the second linear drive mechanism are respectively a first electric push rod and a second electric push rod.

[0014] The beneficial effects of the utility model are as follows:

[0015] The utility model drives the first movable frame to move linearly through the first linear drive mechanism, thereby driving the hollow probe to be inserted into the battery for acupuncture testing. Then, the second movable frame is driven to move linearly through the second linear drive mechanism, thereby driving the temperature measuring mechanism to pass through the first movable frame and extend into the cavity of the hollow probe, and reciprocate inside the cavity to achieve flexible position temperature measurement. The utility model realizes that during the acupuncture process, the hollow probe and the temperature sensor can move relative to each other, so that the temperature sensor can flexibly stay at any position inside the battery in the direction of travel of the hollow probe, thereby obtaining temperature change information inside the battery, and has good practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the utility model;

[0017] Figure 2 Schematic diagram of the connection structure between the guide rod and the temperature sensor.

[0018] Among them: 2-motion platform, 3-signal transmission line, 4-controller, 11-first electric push rod, 12-second electric push rod, 13-second movable frame, 131-fixed seat, 14-temperature measuring mechanism, 141-temperature sensor, 142-installation cavity, 143-guide rod, 144-limiting part, 145-temperature measuring point, 15-first movable frame, 151-through hole, 152-needle seat, 16-hollow probe, 17-battery, 18-base, 19-guide rail. DETAILED DESCRIPTION

[0019] Embodiment 1:

[0020] A needle penetration test device for testing the internal temperature of a battery, such as Figure 1As shown, it includes an acupuncture mechanism, a temperature measuring mechanism 14 and a motion mechanism, the motion mechanism includes a motion platform 2, a first movable frame 15, a second movable frame 13, a first linear drive mechanism and a second linear drive mechanism, the acupuncture mechanism includes a hollow probe 16, one side of the motion platform 2 is connected to the first movable frame 15 and the second movable frame 13 through the first linear drive mechanism, the second linear drive mechanism, respectively; the second movable frame 13 is arranged above the first movable frame 15, and one side of the first movable frame 15 and the second movable frame 13 are respectively provided with a hollow probe 16 and a temperature measuring mechanism 14, the first linear drive mechanism is used to drive the first movable frame 15 to move linearly and drive the hollow probe 16 to insert into the battery 17, the second linear drive mechanism is used to drive the second movable frame 13 to move linearly and drive the free end of the temperature measuring mechanism 14 to pass through the first movable frame 15 and extend into the cavity inside the hollow probe 16 to achieve temperature measurement. Preferably, the first linear drive mechanism and the second linear drive mechanism are respectively a first electric push rod 11 and a second electric push rod 12 . The first electric push rod 11 and the second electric push rod 12 are prior art, so they are not described in detail.

[0021] Preferably, a needle seat 152 is provided at the bottom of the first movable frame 15, and a hollow probe 16 is detachably installed in the needle seat 152, and a pressure sensor is provided between the needle seat 152 and the hollow probe 16, and a through hole 151 that penetrates the internal cavity of the hollow probe 16 is respectively provided in the middle of the first movable frame 15 and the needle seat 152 for the temperature measuring mechanism 14 to pass through.

[0022] Preferably, a fixing seat 131 is disposed at the bottom of the second movable frame 13 , and the fixing seat 131 is detachably connected to the temperature measuring mechanism 14 .

[0023] Preferably, if Figure 2 As shown, the temperature measuring mechanism 14 includes a guide rod 143, a temperature sensor 141 and a limit portion 144. The middle of the guide rod 143 is provided with a mounting cavity 142, and the bottom is provided with a limit portion 144; the temperature sensor 141 is installed in the mounting cavity 142, and the bottom is engaged with the limit portion 144, the temperature measuring point 145 at the bottom of the temperature sensor 141 is in contact with the limit portion 144, and the limit portion 144 is made of a heat-conducting material. Furthermore, the temperature sensor 141 is a thermocouple sensor, and the top is connected to the controller 4 through a signal transmission line 3. Preferably, the limit portion 144 is a boss structure, the top of the limit portion 144 is engaged with the mounting cavity 142, and a clamping groove is provided in the middle of the top of the limit portion 144 corresponding to the temperature sensor 141.

[0024] Preferably, it also includes a base 18, guide rails 19 are respectively provided on both sides of the base 18, both ends of the first movable frame 15 are slidably connected to the guide rails 19, a battery 17 is placed in the middle of the base 18 corresponding to the hollow probe 16, and a puncture channel is provided on the bottom side wall corresponding to the hollow probe 16.

[0025] The utility model drives the first movable frame 15 to move linearly through the first linear drive mechanism, thereby driving the hollow probe 16 to be inserted into the battery 17 for acupuncture testing. Then, the second movable frame 13 is driven to move linearly through the second linear drive mechanism, thereby driving the temperature measuring mechanism 14 to pass through the first movable frame 15 and extend into the cavity of the hollow probe 16, and reciprocate inside the cavity to achieve flexible position temperature measurement. The utility model realizes that during the acupuncture process, the hollow probe 16 and the temperature sensor 141 can move relative to each other, so that the temperature sensor 141 can flexibly stay at any position inside the battery 17 in the direction of travel of the hollow probe 16, thereby obtaining temperature change information inside the battery 17, and has good practicality.

[0026] Embodiment 2:

[0027] A needle penetration test device for testing the internal temperature of a battery, such as Figure 1 As shown, by realizing the relative movement between the hollow probe 16 and the temperature sensor 141, the temperature at any position inside the battery 17 in the direction of the hollow probe 16 is measured. It includes a puncture mechanism, a temperature measuring mechanism 14 and a motion mechanism, and the temperature measuring mechanism 14 and the motion mechanism are respectively connected through a signal transmission line 3 and a controller 4. The puncture mechanism includes a hollow probe 16, and the motion mechanism includes a motion platform 2, a first movable frame 15, a second movable frame 13, a first electric push rod 11 and a second electric push rod 12. The first electric push rod 11 is respectively arranged at both ends of the bottom of the motion platform 2, and the second electric push rod 12 is respectively arranged at both ends of the inner side. The first electric push rod 11 and the second electric push rod 12 are respectively connected to the first movable frame 15 and the second movable frame 13, and the second movable frame 13 is arranged above the first movable frame 15. The bottom sides of the first movable frame 15 and the second movable frame 13 are detachably connected with the hollow probe 16 and the temperature measuring mechanism 14 through a needle seat 152 and a fixing seat 131, respectively. The temperature measuring mechanism 14 passes downward through the first movable frame 15 and extends into the interior of the hollow probe 16 .

[0028] The first electric push rod 11 is controlled to extend and retract up and down and drive the first movable frame 15 to move synchronously, thereby driving the hollow probe 16 to be inserted into the battery 17. The two ends of the second electric push rod 12 are respectively connected to the second movable frame 13. The second electric push rod 12 is controlled to extend and retract up and down and drive the second movable frame 13 to move synchronously, thereby driving the temperature measuring mechanism 14 to be inserted into the hollow probe 16; its operation mechanism is consistent with that of the first electric push rod 11. The first electric push rod 11 and the second electric push rod 12 are both prior arts, so they will not be described in detail. Furthermore, the first electric push rod 11 and the second electric push rod 12 can operate independently of each other to achieve relative movement of the temperature measuring mechanism 14 and the hollow probe 16.

[0029] Preferably, it further comprises a base 18, and guide rails 19 are respectively arranged on both sides of the base 18, and both ends of the first movable frame 15 are respectively slidably connected to the guide rails 19, and a battery 17 is placed in the middle of the base 18 corresponding to the hollow probe 16, and an acupuncture channel is arranged on the bottom side wall corresponding to the hollow probe 16. The existence of the guide rail 19 is to ensure that the hollow movable frame moves in the vertical direction; the base 18 is provided with an acupuncture channel, and the hollow probe 16 can pass through the acupuncture channel.

[0030] Preferably, if Figure 2 As shown, the temperature measuring mechanism 14 includes a guide rod 143, a temperature sensor 141 and a limit portion 144. The middle of the guide rod 143 is provided with an installation cavity 142, and the bottom is provided with a limit portion 144; the temperature sensor 141 is installed in the installation cavity 142, and the bottom is engaged with the limit portion 144, and the temperature measuring point 145 at the bottom of the temperature sensor 141 is in contact with the limit portion 144, and the limit portion 144 is made of a heat conductive material. Further, the temperature sensor 141 is preferably a thermocouple type, and the lead-out test line is integrated into the controller 4 through the signal transmission line 3, and the controller 4 collects and records temperature data.

[0031] Preferably, the limiting portion 144 is a hollow boss type, wherein the hollow portion is fitted and fixed with the temperature measuring point 145 of the temperature sensor 141, and the boss is fitted with the guide rod 143. Furthermore, the limiting portion 144 is made of a material with good thermal conductivity;

[0032] Preferably, the diameter of the through hole 151 of the first movable frame 15 is larger than the outer diameter of the guide rod 143 , so that the temperature measuring mechanism 14 can move smoothly in the through hole 151 .

[0033] Preferably, the fixing seat 131 is used to clamp and fasten the temperature measuring mechanism 14. Further, the fixing seat 131 can clamp the temperature measuring mechanisms 14 of different diameters.

[0034] Preferably, the needle seat 152 is used to clamp and fasten the hollow probe 16. The needle seat 152 has a pressure sensor, which can sense the force transmitted by the hollow probe 16 and feed back the force signal to the controller 4 through the signal transmission line 3. Further, the needle seat 152 can clamp the hollow probes 16 of different diameters. Further, the through hole 151, the guide rod 143 and the hollow probe 16 are all coaxially arranged and located on the same vertical center line.

[0035] Preferably, the interior of the hollow probe 16 is a cavity of a certain depth, the bottom of the cavity should be sufficiently short from the needle tip while satisfying the rigidity of the probe puncture, and the inner diameter of the cavity is ≥ the outer diameter of the temperature measuring mechanism 14. Furthermore, the hollow probe 16 is made of a material with good thermal conductivity.

[0036] Furthermore, if Figure 1 As shown, when the bottom of the temperature measuring mechanism 14 contacts the bottom of the cavity, the lower plane of the temperature measuring mechanism 14 installed on the fixing seat 131 should be higher than the upper plane of the first movable frame 15. The travel of the temperature measuring mechanism 14 and the hollow probe 16 can be adjusted respectively by controlling the first electric push rod 11 and the second electric push rod 12. The controller 4 and the control method are both prior art, so they are not repeated here. The controller 4 can receive data and transmit instructions through signal transmission, including controlling various travels of acupuncture, receiving the pressure sensor signal and the temperature measuring mechanism 14 signal.

[0037] The present invention includes the following test steps when obtaining the internal temperature of the battery 17:

[0038] Step 1: fix the pre-treated battery 17 on the base 18 of the testing device. Preferably, the battery 17 can be tested at different SOCs, with different puncture surfaces and different puncture positions.

[0039] Step 2, install hollow probes 16 of different diameters that meet the test requirements and matching temperature measuring mechanisms 14, and adjust their positions so that the limit portion 144 of the temperature measuring mechanism 14 contacts the bottom of the cavity of the hollow probe 16, and the needle tip of the hollow probe 16 is higher than the battery 17 sample by a certain height.

[0040] Step 3, setting the test parameters on the controller 4. Assume that the effective thickness of the battery 17 sample in the needle puncture direction is M, and the distance between the temperature measuring point 145 and the needle tip is N. Preferably, N<0.1M, and the distance between the internal temperature position of the battery 17 sample to be measured and the puncture point position on the surface of the battery 17 is L, preferably, 0≤L≤M.

[0041] When the internal temperature of the battery 17 sample during the puncture process is to be investigated, the effective stroke of the temperature measuring mechanism 14 can be set to P=N+L, the effective stroke of the hollow probe 16 can be set to Q, Q≥P, and the remaining test conditions such as the puncture speed and the holding time of the hollow probe 16 can be set according to the test requirements.

[0042] Step 4, start the needle puncture test device, the hollow probe 16 and the temperature measuring mechanism 14 move at the same set speed, and the controller 4 starts to record data, including the temperature data of the temperature measuring mechanism 14, the force data of the pressure sensor, the actual stroke data and effective stroke data of the hollow probe 16, and the actual stroke data and effective stroke data of the temperature measuring mechanism 14. When the needle of the hollow probe 16 hits the surface of the battery 17 sample, the pressure sensor on the needle seat 152 generates a force signal and transmits it to the controller 4, and the effective stroke of the hollow probe 16 and the effective stroke of the temperature measuring mechanism 14 start to count. When the effective stroke of the temperature measuring mechanism 14 reaches P, the second electric push rod 12 stops moving, and when the effective stroke of the hollow probe 16 reaches Q, the first electric push rod 11 stops moving.

[0043] Step 5: The hollow probe 16 is kept for a preset time and the test phenomenon is observed.

[0044] The utility model realizes that during the acupuncture process, the hollow probe 16 and the temperature sensor 141 can move relative to each other, so that the temperature sensor 141 can flexibly stay at any position inside the battery 17 in the direction of travel of the hollow probe 16, thereby obtaining the temperature change information inside the battery 17, which has good practicality.

[0045] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A needle penetration test device for testing the internal temperature of a battery, characterized in that: The invention comprises an acupuncture mechanism, a temperature measuring mechanism (14) and a motion mechanism, wherein the motion mechanism comprises a motion platform (2), a first movable frame (15), a second movable frame (13), a first linear drive mechanism and a second linear drive mechanism, and the acupuncture mechanism comprises a hollow probe (16). One side of the motion platform (2) is connected to the first movable frame (15) and the second movable frame (13) through the first linear drive mechanism and the second linear drive mechanism respectively; the second movable frame (13) is arranged above the first movable frame (15), and one side of the first movable frame (15) and the second movable frame (13) are respectively provided with the hollow probe (16) and the temperature measuring mechanism (14), the first linear drive mechanism is used to drive the first movable frame (15) to move linearly and drive the hollow probe (16) to be inserted into the battery (17), and the second linear drive mechanism is used to drive the second movable frame (13) to move linearly and drive the free end of the temperature measuring mechanism (14) to pass through the first movable frame (15) and extend into the cavity inside the hollow probe (16) to achieve temperature measurement.

2. A needle penetration test device for testing the internal temperature of a battery according to claim 1, characterized in that: A needle seat (152) is provided at the bottom of the first movable frame (15), a hollow probe (16) is detachably mounted in the needle seat (152), and a pressure sensor is provided between the needle seat (152) and the hollow probe (16), and a through hole (151) penetrating the internal cavity of the hollow probe (16) is provided in the middle of the first movable frame (15) and the needle seat (152), respectively, for the temperature measuring mechanism (14) to pass through.

3. A needle penetration test device for testing the internal temperature of a battery according to claim 1, characterized in that: A fixing seat (131) is provided at the bottom of the second movable frame (13), and the fixing seat (131) is detachably connected to the temperature measuring mechanism (14).

4. A needle penetration test device for testing the internal temperature of a battery according to claim 1, characterized in that: The temperature measuring mechanism (14) comprises a guide rod (143), a temperature sensor (141) and a limiting portion (144); a mounting cavity (142) is provided in the middle of the guide rod (143), and the limiting portion (144) is installed at the bottom; the temperature sensor (141) is installed in the mounting cavity (142), and the bottom is clamped with the limiting portion (144); a temperature measuring point (145) at the bottom of the temperature sensor (141) is in contact with the limiting portion (144); and the limiting portion (144) is made of a heat-conducting material.

5. A needle penetration test device for testing the internal temperature of a battery according to claim 4, characterized in that: The limiting portion (144) is a boss structure, the top of the limiting portion (144) is snap-fitted with the mounting cavity (142), and a snap-fitting groove is provided in the middle of the top of the limiting portion (144) corresponding to the temperature sensor (141).

6. A needle penetration test device for testing the internal temperature of a battery according to claim 4, characterized in that: The temperature sensor (141) is a thermocouple sensor, and the top is connected to the controller (4) via a signal transmission line (3).

7. A needle penetration test device for testing the internal temperature of a battery according to any one of claims 1 to 6, characterized in that: It also comprises a base (18), guide rails (19) are respectively arranged on both sides of the base (18), both ends of the first movable frame (15) are respectively slidably connected to the guide rails (19), a battery (17) is placed in the middle of the base (18) corresponding to the hollow probe (16), and a puncture channel is arranged on the bottom side wall corresponding to the hollow probe (16).

8. A needle penetration test device for testing the internal temperature of a battery according to any one of claims 1 to 6, characterized in that: The first linear drive mechanism and the second linear drive mechanism are respectively a first electric push rod (11) and a second electric push rod (12).

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