CN112748338A - Power battery short circuit testing machine and testing method - Google Patents

Abstract

The invention relates to a power battery short circuit testing machine, which comprises a box body, wherein a partition plate is fixed in the box body, the box body is sequentially divided into a driving chamber, a test chamber and a temperature control chamber by the partition plate from top to bottom, a driving mechanism is arranged in the driving chamber, a placing plate is arranged in the test chamber, stripper plate and stripper rod, the one end of stripper rod and actuating mechanism's output fixed connection, the other end and the stripper plate fixed connection of stripper rod, it fixes on the baffle to place the board, it is located the stripper plate under, the baffle includes the backup pad, buffer board and connecting plate, backup pad and box fixed connection, the buffer board is fixed between backup pad and connecting plate, the buffer board is the wave line type, the side of test room is opened there is the pressure release mouth, be fixed with the pressure release bag on the pressure release mouth, the outside of pressure release mouth is equipped with the pressure release door, pressure release door one side is articulated with the box, the opposite side is fixed through joint spare and box joint. The invention has the effects of weakening the impact force generated by battery explosion and prolonging the service life of the testing machine.

Description

Power battery short circuit testing machine and testing method

Technical Field

The invention relates to the field of battery detection equipment, in particular to a power battery short circuit testing machine and a testing method.

Background

The power battery is a power supply for providing a power source for the tool, and as the holding capacity of the electric automobile increases, accidents of the electric automobile frequently occur, and the safety of the power battery draws attention of people.

The power battery short circuit tester is also called a battery large-current short circuit tester, and is designed by integrating various battery short circuit test standard requirements, and the requirements meet battery performance standard specifications; the short-circuit device is required to meet the requirement that the internal resistance range is less than or equal to 100m omega according to the standard requirement, so that the maximum short-circuit current required by the test is obtained.

Chinese utility model patent application publication No. CN204166108U discloses "a battery short circuit testing machine", including outer box, set up the frame in the outer box, set up in the warm and humid device of frame bottom, set up in the short circuit test mechanism at frame middle part and set up in the actuating mechanism at frame top, short circuit test mechanism places the board including the sample, stripper plate and stripper plate guide arm, and the one end of stripper plate guide arm is connected in actuating mechanism's output, and the other end of stripper plate guide arm is connected in the stripper plate, and the sample is placed the board and is corresponded to the stripper plate.

The above prior art solutions have the following drawbacks: when a defective battery is tested, the battery is easily exploded, and once exploded, the machine is easily damaged by the impact force generated by the explosion.

Disclosure of Invention

The invention aims to provide a power battery short circuit testing machine and a testing method, which can weaken the impact force generated by explosion.

The above object of the present invention is achieved by the following technical solutions:

a power battery short circuit testing machine comprises a box body, wherein a partition plate is fixed in the box body, the box body is sequentially divided into a driving chamber, a test chamber and a temperature control chamber by the partition plate from top to bottom, a driving mechanism is arranged in the driving chamber, a placing plate, an extrusion plate and an extrusion rod are arranged in the test chamber, one end of the extrusion rod is fixedly connected with the output end of the driving mechanism, the other end of the extrusion rod is fixedly connected with the extrusion plate, the placing plate is fixed on the partition plate, the placing plate is positioned under the extrusion plate, the partition plate comprises a supporting plate, a buffer plate and a connecting plate, the supporting plate is fixedly connected with the box body, the buffer plate is fixed between the supporting plate and the connecting plate, the buffer plate is in a wave line type, a pressure relief opening is formed in the side surface of the test chamber, a pressure relief bag is fixed on the pressure relief opening, a pressure relief, the other side is clamped and fixed with the box body through a clamping piece.

Through adopting above-mentioned technical scheme, the battery is put on placing the board, and actuating mechanism drives the stripper plate through the stripper rod and to placing the board direction motion, and the stripper plate extrudees the battery of placing on the board, tests. If the battery explodes, air in the test room rapidly expands, the expanded air flow diffuses to the periphery, the air flow impacts on a pressure relief door of a pressure relief opening, the pressure relief door is opened, a pressure relief bag rapidly expands along with the air flow, the expanded space is enlarged, the pressure relief effect is achieved, and the impact of the air flow generated by explosion on the case is weakened; the air current strikes on the connecting plate, and the connecting plate removes to the backup pad direction, and the connecting plate extrusion buffer board, the buffer board takes place to warp, and then has weakened the impact of air current to drive chamber and control by temperature change room, plays the guard action.

The invention is further configured to: the pressure release mouth is equipped with the annular arch, be fixed with the locking piece on the box, be equipped with the annular groove on the locking piece, annular arch and annular groove cooperation joint, the sack joint of pressure release bag is between annular arch and annular groove.

Through adopting above-mentioned technical scheme, the sack cover of pressure release bag is on annular protrusion, and the locking piece lid is fixed on annular protrusion, and then presss from both sides the pressure release bag tightly between annular protrusion and annular groove.

The invention is further configured to: be equipped with the mounting groove on the pressure release door, the one end of joint spare is located the mounting groove, and joint spare and mounting groove sliding connection are connected with the elastic component between the bottom of joint spare and mounting groove, be equipped with spacing hole on the box, the tip and the spacing hole cooperation joint of mounting groove are kept away from to the joint spare.

Through adopting above-mentioned technical scheme, the slip joint spare, the joint spare card is gone into spacing downthehole, and the pressure release door can't rotate, and then the pressure release door closure is fixed on the pressure release mouth. When exploding, the air current striking decompression door, the joint spare rupture, the decompression door is opened, and the inflation of pressure release bag carries out the pressure release.

The invention is further configured to: the elastic part is a first spring, one end of the first spring is fixedly connected with the clamping part, and the other end of the first spring is fixedly connected with the mounting groove.

Through adopting above-mentioned technical scheme, the elasticity of first spring makes joint spare slide to spacing hole direction, and the joint spare chucking that makes is in spacing downthehole.

The invention is further configured to: and a notch is arranged on the side surface of the clamping piece departing from the test room.

Through adopting above-mentioned technical scheme, when exploding, the air current striking decompression door, the fracture takes place from incision department easily for the decompression door is opened, and the pressure release bag collides, carries out the pressure release.

The invention is further configured to: the box body is provided with a key for pushing the clamping piece away from the limiting hole.

Through adopting above-mentioned technical scheme, the part of joint spare disconnection is stayed spacing downthehole, can make joint spare break away from spacing hole through pressing the button.

The invention is further configured to: all be equipped with the spout on backup pad and the connecting plate, the spout in-connection has the bolt, the buffer board passes through the bolt respectively with backup pad, connecting plate fixed connection.

Through adopting above-mentioned technical scheme, buffer board and backup pad, connecting plate are connected fixedly, and the connecting plate passes through the buffer board to be fixed in the backup pad, and the air current strikes on the connecting plate, and the connecting plate can remove to the backup pad direction, and the connecting plate extrusion buffer board, the buffer board takes place to warp, and then has weakened the impact of air current to driver's cabin and control by temperature change room, plays the guard action.

The invention is further configured to: the vertical section of the sliding groove is T-shaped, the nut of the bolt is positioned in the sliding groove, the nut of the bolt is connected with the sliding groove in a sliding mode, and the rod body of the bolt extends out of the sliding groove.

Through adopting above-mentioned technical scheme, tighten the nut, bolt and spout are fixed, simultaneously with the fixed of buffer board, the bolt does not die the buffer board complete fixation, and the air current strikes on the connecting plate, and the connecting plate extrudees the buffer board, and the crest height of buffer board reduces, and the bolt slides in the spout, and the buffer board extends to both sides, plays the effect that weakens the impact force.

The invention also discloses a testing method of the power battery short-circuit testing machine, which is applied to the power battery short-circuit testing machine and comprises the following steps:

s1: debugging before testing, namely placing the battery on a placing plate (4), turning on a power switch on a control panel, and selecting the temperature and the short-circuit resistance value required by the test;

s2: starting a test, wherein a driving mechanism (3) is connected with a control system, the driving mechanism (3) drives an extrusion plate (41) to move towards the direction of a placing plate (4) through an extrusion rod (42), and the extrusion plate (41) extrudes a battery on the placing plate (4);

s3: the result shows that the positive electrode and the negative electrode of the battery are subjected to external short circuit for 10 minutes, the external line resistance is less than 5m omega, and the battery is observed for 1 hour and is not required to explode or ignite.

In conclusion, the invention has the following beneficial effects: if the battery explodes, the exploded airflow impacts the pressure relief door of the pressure relief opening, the pressure relief door is opened, the pressure relief bag rapidly expands, the pressure relief effect is achieved, and the impact of the airflow generated by explosion on the case is weakened; the air current strikes on the connecting plate, and the connecting plate removes to the backup pad direction, and the connecting plate extrusion buffer board, the buffer board takes place to warp, and then has weakened the impact of air current to driver's cabin and control by temperature change room, plays the guard action, has improved the life of testing machine.

Drawings

FIG. 1 is a schematic structural diagram of a power battery short-circuit tester according to the present invention;

FIG. 2 is an internal structure diagram of a power battery short circuit tester according to the present invention;

FIG. 3 is an enlarged schematic view of portion A of FIG. 2;

FIG. 4 is a partial cross-sectional view of the tank in the direction of the pressure relief vent;

FIG. 5 is a partial sectional view of the case along the direction of the stopper hole.

In the figure: 1. a box body; 11. a viewing port; 12. a drive chamber; 13. a laboratory; 14. a temperature control chamber; 2. a partition plate; 21. a support plate; 22. a buffer plate; 23. a connecting plate; 24. a chute; 25. a bolt; 3. a drive mechanism; 31. a support; 32. a drive motor; 33. a screw rod; 34. a slider; 4. placing the plate; 41. a pressing plate; 42. an extrusion stem; 5. a pressure relief port; 51. a pressure relief bag; 52. an annular projection; 53. a locking member; 54. an annular groove; 6. a pressure relief door; 61. accommodating grooves; 62. mounting grooves; 63. a clamping piece; 64. cutting; 65. a first spring; 7. a limiting hole; 71. a through hole; 8. pressing a key; 81. a button; 82. a push rod; 83. a second spring; 9. a temperature and humidity mechanism; 91. a water tank; 92. a condenser; 93. a fan; 94. a temperature and humidity controller.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1 and 2, the power battery short circuit testing machine disclosed by the invention comprises a box body 1, wherein an observation port 11 is formed in the front surface of the box body 1, and an explosion-proof glass (not shown) is fixed on the observation port 11. A partition board 2 (refer to fig. 3) is fixed in the box body 1, and the box body 1 is sequentially divided into a driving chamber 12, a test chamber 13 and a temperature control chamber 14 by the partition board 2 from top to bottom.

Referring to fig. 2 and 3, the partition board 2 includes a support plate 21, a buffer plate 22 and a connecting plate 23, the support plate 21 is fixedly connected with the box 1, the connecting plate 23 is abutted against the inner wall of the case, the buffer plate 22 is fixed between the support plate 21 and the connecting plate 23, the buffer plate 22 is in a wavy line shape, and the width of the buffer plate 22 is smaller than the widths of the support plate 21 and the connecting plate 23. The air current that the battery explosion produced strikes on connecting plate 23, and connecting plate 23 moves to backup pad 21 direction, and connecting plate 23 extrusion buffer board 22, buffer board 22 take place to warp, and then has weakened the impact of air current to drive chamber 12 and control by temperature change room 14, plays the guard action.

The supporting plate 21 and the connecting plate 23 are provided with sliding grooves 24 towards the side face of the buffer plate 22, the vertical section of each sliding groove 24 is in a T shape, a bolt 25 is connected in each sliding groove 24, a nut of each bolt 25 is located in each sliding groove 24, the nut of each bolt 25 is in sliding connection with the corresponding sliding groove 24, a rod body of each bolt 25 extends out of each sliding groove 24, and the buffer plate 22 is fixedly connected with the supporting plate 21 and the corresponding connecting plate 23 through the corresponding bolt 25. The nut is screwed up, bolt 25 and spout 24 are fixed, simultaneously with the fixed of buffer board 22, bolt 25 does not die the complete fixation of buffer board 22, and the air current strikes on connecting plate 23, and connecting plate 23 extrusion buffer board 22, the crest height reduction of buffer board 22, and bolt 25 slides in spout 24, and buffer board 22 extends to both sides, plays the effect that weakens the impact force.

The driving chamber 12 is internally provided with a driving mechanism 3, the driving mechanism 3 comprises a support 31, a driving motor 32, a screw rod 33 and a sliding block 34, the support 31 is fixed on the support plate 21 through a screw, the driving motor 32 is fixed on the support 31, the screw rod 33 is vertically connected with the support 31 in a rotating manner, the sliding block 34 is connected with the support 31 in a sliding manner, the sliding block 34 is in threaded connection with the screw rod 33, the number of the screw rods 33 is two, the two screw rods are respectively positioned at two ends of the sliding block 34, and the driving motor 32 drives the two screw. The driving motor 32 is started, the driving motor 32 drives the two screw rods 33 to rotate, and the screw rods 33 drive the sliding blocks 34 to slide up and down along the support 31.

A placing plate 4, a squeezing plate 41 and a squeezing rod 42 are arranged in the test chamber 13, one end of the squeezing rod 42 extends into the driving chamber 12 and is fixedly connected with the sliding block 34, a sensor (not shown) is arranged at the connecting position of the squeezing rod 42 and the sliding block 34, the other end of the squeezing rod 42 is fixedly connected with the squeezing plate 41, the placing plate 4 is fixed on the connecting plate 23 close to the temperature control chamber 14, and the placing plate 4 is positioned right below the squeezing plate 41. The driving motor 32 is started, the driving motor 32 drives the two screw rods 33 to rotate, the screw rods 33 drive the sliding blocks 34 to slide downwards along the support 31, the sliding blocks 34 drive the extrusion plates 41 to move towards the direction of the placing plate 4 through the extrusion rods 42, and the extrusion plates 41 extrude the batteries on the placing plate 4.

Referring to fig. 2 and 4, a pressure relief opening 5 is formed in the side surface of the test chamber 13, the pressure relief opening 5 is communicated with the test chamber 13, a pressure relief bag 51 covers the pressure relief opening 5, and the pressure relief bag 51 is made of PEI plastics. An annular bulge 52 is fixed on the side wall of the pressure relief opening 5 far away from the laboratory 13 in a welding mode, and the annular bulge 52 and the pressure relief opening 5 are arranged coaxially. There is locking piece 53 through the screw fixation on the box 1, and locking piece 53 is the ring form, and locking piece 53 and 5 coaxial settings in pressure release mouth have seted up annular groove 54 on the locking piece 53, and annular bulge 52 and annular groove 54 cooperation joint, the sack joint of pressure release bag 51 is between annular bulge 52 and annular groove 54.

The air current strikes on the pressure relief bag 51 of pressure relief opening 5, and pressure relief bag 51 expands rapidly thereupon, and pressure relief bag 51 can avoid flame to scatter, has increased the expanded space simultaneously, plays the pressure release effect, and then has weakened the impact of the air current that the explosion produced to the quick-witted case.

Referring to fig. 4 and 5, the pressure relief opening 5 is covered with the pressure relief door 6, the pressure relief door 6 is opened with an accommodating groove 61 corresponding to the position of the pressure relief opening 5, and the accommodating groove 61 is used for accommodating the pressure relief bag 51. Door 6 one side and box 1 hinge, and mounting groove 62 has been seted up to the opposite side, and mounting groove 62 has two, and two mounting grooves 62 symmetry set up on door 6 leaks, and mounting groove 62 upper cover closes apron (not shown), and the quilt is through screw and door 6 fixed connection leaks. Sliding connection has joint spare 63 in mounting groove 62, and mounting groove 62 is stretched out to the one end of joint spare 63, and the terminal surface that joint spare 63 stretches out mounting groove 62 is the inclined plane, and it has incision 64 to open on the side that joint spare 63 deviates from pressure relief vent 5, and incision 64 is the triangle-shaped. Be connected with first spring 65 between the bottom of joint spare 63 and mounting groove 62, the one end and the joint spare 63 fixed connection of first spring 65, the other end and mounting groove 62 fixed connection. The machine case is provided with a limiting hole 7 corresponding to the clamping piece 63, and one end of the clamping piece 63 extending out of the mounting groove 62 is clamped with the limiting hole 7 in a matched mode.

The clamping piece 63 is clamped into the limiting hole 7, the pressure relief door 6 cannot rotate, and the pressure relief door 6 is covered and fixed on the pressure relief opening 5. When explosion happens, the air flow impacts the pressure relief door 6, the clamping piece 63 is broken off from the notch 64, the pressure relief door 6 is opened, and the pressure relief bag 51 is expanded to relieve pressure.

Referring to fig. 5, a through hole 71 is formed in the limiting hole 7, and the key 8 is slidably connected in the through hole 71. The key 8 comprises a button 81 and a push rod 82, the button 81 is connected with the through hole 71 in a sliding mode, a second spring 83 is fixed on the button 81, the other end of the second spring 83 is fixedly connected with the through hole 71, and the second spring 83 is sleeved on the push rod 82. The push rod 82 is connected with the through hole 71 in a sliding mode, the push rod 82 is fixedly connected with the button 81, and one end, far away from the button 81, of the push rod 82 extends into the limiting hole 7. If the disconnected part of the clamping piece 63 is left in the limiting hole 7, the clamping piece 63 can be separated from the limiting hole 7 by pressing the key 8.

Referring to fig. 2, a temperature and humidity mechanism 9 is disposed in the temperature control chamber 14, the temperature and humidity mechanism 9 includes a water tank 91 and a condenser 92, a fan 93 and a temperature and humidity controller 94 are fixed in the case, and the water tank 91, the condenser 92, the fan 93 and the temperature and humidity controller 94 are connected. During testing, the temperature and humidity to be tested can be set by the temperature and humidity controller 94.

The invention also discloses a testing method of the power battery short circuit testing machine, which comprises the following steps:

s1: debugging before surveying, opening the chamber door, placing the battery on placing board 4, closing the chamber door, opening the switch on the control panel, the temperature and the short circuit resistance that the selection test needs to use.

S2: the test is started, the driving motor 32 is connected with the control system, the driving motor 32 is started, the driving motor 32 drives the two screw rods 33 to rotate, the screw rods 33 drive the sliding blocks 34 to slide downwards along the support 31, the sliding blocks 34 drive the extrusion plates 41 to move towards the direction of the placing plate 4 through the extrusion rods 42, and the extrusion plates 41 extrude the batteries on the placing plate 4 for testing.

S3: the result shows that the positive electrode and the negative electrode of the battery are subjected to external short circuit for 10 minutes, the external line resistance is less than 5m omega, and the battery is observed for 1 hour and is not required to explode or ignite.

The implementation principle of the embodiment is as follows: the driving motor 32 is started, the driving motor 32 drives the two screw rods 33 to rotate, the screw rods 33 drive the sliding blocks 34 to slide downwards along the support 31, the sliding blocks 34 drive the extrusion plates 41 to move towards the direction of the placing plate 4 through the extrusion rods 42, and the extrusion plates 41 extrude the batteries on the placing plate 4. During testing, if the battery explodes, air in the test chamber 13 rapidly expands, the expanded air flow is diffused to the periphery, the air flow impacts on the pressure relief door 6 of the pressure relief opening 5, the clamping piece 63 is broken off from the notch 64, the pressure relief door 6 is opened, the pressure relief bag 51 rapidly expands along with the air flow, the expansion space is enlarged, the pressure relief effect is achieved, and the impact of the air flow generated by explosion on the case is weakened. The airflow impacts on the connecting plate 23, the connecting plate 23 moves towards the supporting plate 21, the connecting plate 23 extrudes the buffer plate 22, and the buffer plate 22 deforms, so that the impact of the airflow on the driving chamber 12 and the temperature control chamber 14 is weakened, and a protective effect is achieved.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims (9)

1. The utility model provides a power battery short circuit testing machine, includes box (1), box (1) internal fixation has baffle (2), baffle (2) from top to bottom separate into drive chamber (12), laboratory (13) and control by temperature change room (14) with box (1) in proper order, be equipped with actuating mechanism (3) in drive chamber (12), be equipped with in laboratory (13) and place board (4), stripper plate (41) and stripper rod (42), the output fixed connection of the one end of stripper rod (42) and actuating mechanism (3), the other end and stripper plate (41) fixed connection of stripper rod (42), place board (4) and fix on baffle (2), place board (4) and be located stripper plate (41) under, its characterized in that: baffle (2) include backup pad (21), buffer board (22) and connecting plate (23), backup pad (21) and box (1) fixed connection, buffer board (22) are fixed between backup pad (21) and connecting plate (23), and buffer board (22) are the wave line type, open the side of laboratory (13) has pressure release mouth (5), be fixed with pressure release bag (51) on pressure release mouth (5), the outside of pressure release mouth (5) is equipped with pressure release door (6), pressure release door (6) one side and box (1) are articulated, and the opposite side is fixed through joint spare (63) and box (1) joint.

2. The power battery short circuit testing machine according to claim 1, characterized in that: pressure release mouth (5) are equipped with annular protrusion (52), be fixed with locking piece (53) on box (1), be equipped with annular groove (54) on locking piece (53), annular protrusion (52) and annular groove (54) cooperation joint, the sack joint of pressure release bag (51) is between annular protrusion (52) and annular groove (54).

3. The power battery short circuit testing machine according to claim 1, characterized in that: be equipped with mounting groove (62) on pressure release door (6), the one end of joint spare (63) is located mounting groove (62), and joint spare (63) and mounting groove (62) sliding connection are connected with the elastic component between the bottom of joint spare (63) and mounting groove (62), be equipped with spacing hole (7) on box (1), the tip and spacing hole (7) cooperation joint of mounting groove (62) are kept away from in joint spare (63).

4. The power battery short circuit testing machine according to claim 3, characterized in that: the elastic part is a first spring (65), one end of the first spring (65) is fixedly connected with the clamping piece (63), and the other end of the first spring is fixedly connected with the mounting groove (62).

5. The power battery short circuit testing machine according to claim 3, characterized in that: the side of the clamping piece (63) departing from the test chamber (13) is provided with a notch (64).

6. The power battery short circuit testing machine according to claim 3, characterized in that: the box body (1) is provided with a key (8) used for pushing the clamping piece (63) away from the limiting hole (7).

7. The power battery short circuit testing machine according to claim 1, characterized in that: all be equipped with spout (24) on backup pad (21) and connecting plate (23), spout (24) in-connection bolt (25), buffer board (22) pass through bolt (25) respectively with backup pad (21), connecting plate (23) fixed connection.

8. The power battery short circuit testing machine according to claim 7, characterized in that: the vertical section of spout (24) is the T type, the nut of bolt (25) is located spout (24), and the nut and spout (24) sliding connection of bolt (25), the body of rod of bolt (25) stretches out in spout (24).

9. A testing method of a power battery short-circuit testing machine is applied to the power battery short-circuit testing machine of any one of claims 1-8, and is characterized by comprising the following steps:

s1: debugging before testing, namely placing the battery on a placing plate (4), turning on a power switch on a control panel, and selecting the temperature and the short-circuit resistance value required by the test;

s2: starting a test, wherein a driving mechanism (3) is connected with a control system, the driving mechanism (3) drives an extrusion plate (41) to move towards the direction of a placing plate (4) through an extrusion rod (42), and the extrusion plate (41) extrudes a battery on the placing plate (4);

s3: the result shows that the positive electrode and the negative electrode of the battery are subjected to external short circuit for 10 minutes, the external line resistance is less than 5m omega, and the battery is observed for 1 hour and is not required to explode or ignite.

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