CN107238799B

CN107238799B - Battery testing device

Info

Publication number: CN107238799B
Application number: CN201610183823.1A
Authority: CN
Inventors: 张鑫; 王瑛; 柯伟; 韦德行; 王国庆; 于卫昆
Original assignee: Material And Industrial Technology Research Institute Beijing
Current assignee: Material And Industrial Technology Research Institute Beijing
Priority date: 2016-03-28
Filing date: 2016-03-28
Publication date: 2023-09-12
Anticipated expiration: 2036-03-28
Also published as: CN107238799A

Abstract

The invention relates to the field of battery safety testing devices, and discloses battery testing equipment, which comprises: a support heating mechanism (1) capable of supporting and heating the battery to be tested; a pressing mechanism (2) having a pressing element (21) and a first pressure sensor (22), the pressing element (21) being capable of being driven to approach or depart from the support heating mechanism (1) so as to press the battery under test on the support heating mechanism (1), the first pressure sensor (22) being capable of measuring a pressure from the pressing element (21) received by the battery under test supported on the support heating mechanism (1) when the pressing element (21) approaches the support heating mechanism (1). The battery testing equipment provided by the invention can perform various safety tests such as extrusion, needling and the like on the battery to be tested, and is convenient for obtaining the performance parameters of the battery to be tested in a single test.

Description

Battery testing device

Technical Field

The invention relates to a battery safety test device, in particular to battery test equipment.

Background

Batteries (including thermal battery cells and battery packs, lithium ion batteries, etc.) may be in different operating environments when in use and thus exhibit different performance. For example, under extreme conditions such as high temperature and/or high voltage, over-discharge, overshoot, etc. may occur, which may cause damage to the reversibility of the battery, or even directly cause explosion of the battery, and threaten the safety of the user. Therefore, batteries often require safety testing before they can be put into service.

The traditional battery safety test mainly comprises needling, extrusion, impact and the like, namely, in the state that the battery to be tested is fully charged, pressing elements or devices such as steel nails, steel bars, extrusion devices and the like are utilized to pierce, impact and extrude the battery to be tested, so as to observe whether the battery to be tested has phenomena such as fire, explosion and the like.

However, the test device or equipment used in the battery test has a relatively single function, is difficult to completely simulate the state and environment of the battery in actual use, cannot determine the pressure applied in the process of puncturing, impacting and extruding, is difficult to obtain the state and environment condition of the tested battery in the process of firing and explosion through a single test, wastes battery materials and has high test cost.

To this end, it is necessary to provide a battery testing device to solve at least some of the technical problems in the prior art.

Disclosure of Invention

The invention aims to provide a battery test device which can perform various safety tests such as extrusion, needling and the like on a battery to be tested and is convenient for obtaining the performance parameters of the battery to be tested in a single test.

In order to solve the above technical problems, the present invention provides a battery testing apparatus, comprising: a support heating mechanism capable of supporting and heating the battery to be measured; a pressing mechanism having a pressing element that can be driven to approach or depart from the support heating mechanism so as to press the battery to be measured on the support heating mechanism, and a first pressure sensor that can measure a pressure from the pressing element that the battery to be measured supported on the support heating mechanism receives when the pressing element approaches the support heating mechanism;

the pressing mechanism comprises a pressure cradle head connected with the pressing element, and the pressure cradle head comprises:

the fixing part comprises a first fixing plate and a second fixing plate which are arranged at intervals, and a screw rod which is arranged on the first fixing plate and the second fixing plate through a bearing;

the cloud platform portion, this cloud platform portion is including first cloud platen and the second cloud platen that the interval set up, cloud platform portion still including the interval set up in the second cloud platen be dorsad the biography clamp plate of first cloud platen one side, this biography clamp plate pass through connecting rod sliding connection in the second cloud platen, just first pressure sensor install in the second cloud platen be towards the one side of biography clamp plate, the component that applies pressure be pressure push pedal or firing pin and pass through the biography clamp plate connect in on the second cloud platen, in order can be in when the lead screw rotates, pass through in proper order first cloud platen, first bracing piece, second cloud platen, first pressure sensor, biography clamp plate will drive force transfer extremely the component that applies pressure.

Preferably, the support heating mechanism comprises a heating plate and a graphite backing plate for supporting the battery to be tested, the heating plate is provided with an electric heating wire, and the graphite backing plate is arranged in a fitting manner with the heating plate so as to be capable of heating the battery to be tested supported on the graphite backing plate when the electric heating wire is electrified.

Preferably, the battery test apparatus includes an apparatus housing formed with a test cavity, the support heating mechanism having a support surface within the test cavity, the pressing element moving within the test cavity to be either adjacent to or remote from the support heating mechanism.

Preferably, the apparatus housing includes an upper sleeve and a lower sleeve having opposite openings, respectively, and abutting each other, the pressing mechanism is mounted to an upper end wall of the upper sleeve, and the support heating mechanism is provided on an inner side surface of a lower end wall of the lower sleeve.

Preferably, the battery testing apparatus includes a power device for driving the pressing member, the power device being disposed on an outer side surface of the upper end wall of the upper sleeve and drivingly connected to the pressing member.

Preferably, at least one of a lead hole, a temperature sensor and a second pressure sensor is arranged on the upper end wall of the upper sleeve.

Preferably, the first pan plate is provided with a screw hole in threaded fit with the screw rod, the pressing element is connected to one side of the second pan plate, which is opposite to the first pan plate, and the first pan plate and the second pan plate are connected with each other through a first support rod penetrating through one of the first fixing plate and the second fixing plate and extending along a direction parallel to the extending direction of the screw rod, so that when the screw rod rotates, the pan head drives the pressing element to move along the axial direction of the screw rod.

Preferably, a safety valve is installed on the apparatus housing, and is opened to allow the test chamber to communicate with a space outside the apparatus housing when the air pressure in the test chamber reaches a set value.

Preferably, the device housing is further provided with a camera device for observing the inside of the test cavity, the camera device comprises a stainless steel sleeve, one end of the stainless steel sleeve is provided with an infrared camera with a quartz glass outer cover and is provided with a control line hole extending to the other end in a penetrating way, and a control line inlet for introducing a control line connected to the infrared camera is formed at one end of the stainless steel sleeve, which is far away from the infrared camera.

Through the technical scheme, the battery testing equipment can heat the tested battery through the supporting heating mechanism, so that the tested battery is under different testing temperature conditions; and pressure is applied to the battery to be tested through a pressing element (such as a pressure push plate or a firing pin) to pierce or press the battery to be tested, wherein the first pressure sensor can measure the pressure applied by the battery to be tested, so that the limit pressure condition that the battery to be tested is on fire or explosion and the like can be obtained in a single or fewer times of testing, thereby being convenient for saving battery materials and reducing testing cost.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate the invention and together with the description serve to explain, without limitation, the invention. In the drawings:

FIG. 1 is a schematic cross-sectional view of a battery testing apparatus according to a preferred embodiment of the present invention;

FIG. 2 is a schematic top view of the battery testing apparatus of FIG. 1;

FIGS. 3a and 3b are front and perspective schematic views, respectively, of a pressure head of the battery testing apparatus of FIG. 1;

fig. 4a and fig. 4b are schematic front view and perspective view of the pressure head in fig. 3a in another lifting position;

fig. 5a and 5b are cross-sectional views of the safety valve of the battery testing apparatus of fig. 1, respectively;

fig. 6a and 6b are respectively perspective and front view schematic diagrams of an image pickup device of the battery test apparatus of fig. 1.

Description of the reference numerals

Graphite backing plate with 1 supporting heating mechanism 11 and heating plate 12

2 pressing mechanism 21 pressing element 21a pressing plate

22 first pressure sensor 23 fixing portion 231 first fixing plate

232 second fixing plate 233 screw 234 second support rod

24 pan-tilt 241 first pan-tilt 242 second pan-tilt

243 first support rod 244 pressure transmitting plate 245 connecting rod

246 ball joint 3 equipment shell 31 test cavity

32 upper sleeve 321 lead hole 322 temperature sensor

323 second pressure sensor 33 lower sleeve 4 power device

5 relief valve 51 valve seat 511 intermediate passage

512 step 5121 groove 52 diaphragm

53 compacting piece 531 protruding part 6 camera device

61 control line hole 62 control line inlet 63 sleeve

631 external screw 632 step 64 camera

65 sealing ring

Detailed Description

The following describes specific embodiments of the present invention in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.

Referring to fig. 1 to 6b, a battery testing apparatus according to a preferred embodiment of the present invention includes a support heating mechanism 1 and a pressing mechanism 2.

Wherein a battery (not shown) to be tested may be supported on the support heating mechanism 1 and heated by the support heating mechanism 1 so as to have a desired test temperature of the battery to be tested. By controlling the heating element (such as the electric heating plate 11 described below), the battery to be measured can be made to have different temperatures.

The pressing mechanism 2 has a pressing member 21 (such as a pressing push plate 21a or a striker, etc.), and the pressing member 21 can be driven by, for example, the power device 4 to come close to or go away from the support heating mechanism 1, thereby pressing the battery to be measured on the support heating mechanism 1. It is understood that the pressing herein includes penetrating, impacting or pressing the battery to be measured by using various types of pressing members 21 such as a striker, a pressing plate 21a, etc., as long as the pressing members 21 exert a pressing force on the battery to be measured, which is within the scope of the present invention. In addition, the pressing mechanism 2 further has a first pressure sensor 22, and the first pressure sensor 22 is capable of measuring the pressure that the battery to be measured supported on the support heating mechanism 1 receives when the pressing member 21 approaches the support heating mechanism 1 and acts on the battery to be measured, and this pressure may be a pressure value in an instant (or short time) under the impact, or may be a gradually changing pressure that the pressure pushing plate 21a exerts on the battery to be measured.

The battery test equipment can be formed into various structural forms, the tested battery is heated by the supporting heating mechanism 1 and is in different test temperature conditions (the temperature measuring element is used for controlling the test temperature), the pressure is applied to the tested battery by the pressure applying element 21 of the pressure applying mechanism 2 so as to puncture, impact and squeeze the tested battery, meanwhile, the first pressure sensor 22 is used for measuring the applied pressure, so that various safety tests can be carried out on the tested battery, the limit pressure conditions of the tested battery when the fire, explosion and the like occur can be conveniently obtained in single or fewer times of tests, and the battery materials can be effectively saved and the test cost can be reduced.

Referring to fig. 1, in a battery testing apparatus according to a preferred embodiment of the present invention, an apparatus housing 3 may be included, the apparatus housing 3 being formed with a testing chamber 31. In this case, the main functional components of the battery testing apparatus (such as the supporting heating mechanism 1 and the pressing mechanism 2) may be disposed in the testing chamber 31, and the safety test is performed in the testing chamber 31, so as to avoid the injury to the test personnel caused by the combustion, explosion, etc. of the tested battery during the test. For example, in the illustrated embodiment, the support heating mechanism 1 has a support surface (such as the upper surface of the graphite backing plate 12) for supporting the battery under test, the support surface being located in the test chamber 31, and the pressing member 21 being moved within the test chamber 31 to approach or depart from the support heating mechanism 1 so as to apply pressure to the battery under test on the support surface when approaching, at which time, if the battery burns and explodes, flame or explosion fragments can be confined in the test chamber 31 by the apparatus housing 3, avoiding injuring the test person. In addition, as will be seen from the following description, the apparatus housing 3 may be provided with a vertically extending test chamber 31, the support surface supporting the heating mechanism 1 being located in a horizontal direction, and the pressing member 21 being moved in a vertical direction to apply pressure to the battery under test, so that the respective parts can be conveniently placed/mounted. For example, the pressing mechanism 2 and its power means 4 may be mounted on the upper end wall of the apparatus housing 3, with the support heating mechanism 1 being placed at the bottom of the test chamber 31.

In order to facilitate placement of the battery under test on the support surface supporting the heating mechanism 1 and to facilitate installation, maintenance and replacement of components within the test chamber 31, the apparatus housing 3 may be provided as a split structure. Specifically, as shown in fig. 1, the apparatus housing 3 may include an upper sleeve 32 and a lower sleeve 33, the upper sleeve 32 and the lower sleeve 33 having opposite openings, respectively, and being abutted against each other (e.g., by flanges). The pressing means 2 is mounted to the upper end wall of the upper sleeve 32 and its pressing element 21 can be in driving connection with the power take-off of the power means 4, such as a stepper motor or the like, for which purpose the power means 4 can be arranged on the outer side of the upper end wall of the upper sleeve 32. The support heating mechanism 1 is provided on the inner side surface of the lower end wall of the lower sleeve 33, and may be electrically connected to a power source located outside the apparatus housing 3, for example, using a lead wire.

In the above preferred embodiment, in order to facilitate the access of the lead wires for the power unit 4, the battery to be tested supporting the heating mechanism 1, and the like, a lead wire hole 321 may be provided in the apparatus case 3. For example, referring to fig. 2, the lead hole 321 may be provided on the upper end wall of the upper sleeve 32. Additionally, optionally or preferably, a temperature sensor 322, a second pressure sensor 323, etc. may also be provided on the upper end wall for measuring, monitoring, etc. parameters of the ambient temperature and/or air pressure within the test chamber 31, so as to more accurately and comprehensively obtain the performance condition of the battery under test.

Referring again to fig. 1, in the battery testing apparatus of the present invention, the support heating mechanism 1 may include a heating plate 11 and a graphite backing plate 12, and the graphite backing plate 12 is disposed on the upper side of the heating plate 11 in a fitting manner and is capable of supporting the battery to be tested (e.g., by forming an upper surface as a supporting surface). The heating plate 11 may have a heating wire which, when energized, can heat the battery under test through the graphite backing plate 12. In the preferred embodiment, the graphite backing plate 12 is provided primarily for testing of the thermal battery(s) and serves as a current collector during discharge. For other types of batteries, the graphite backing plate 12 is not required or other materials of backing plate may be utilized.

As can be seen from the above description, the battery test process has a relatively harsh environment (due to combustion, explosion, etc.), and the relatively closed test chamber 31 is subjected to high temperature and high pressure, which may cause damage to the device, for this purpose, a relief valve 5 for relieving pressure may be provided on the device housing 3, so that when the pressure in the test chamber 31 rises to a set value, for example, by the pressure difference across the relief valve 5, the test chamber 31 is communicated with the space outside the device housing 3, thereby releasing the pressure in the test chamber 31 and defining the highest air pressure allowed by the test chamber 31. In addition, in order to observe the test state, the camera device 6 may be mounted on the device housing 3, and the problem that the camera device 6 cannot clearly shoot the test cavity 31 or is damaged at high temperature may be avoided by a special design.

In order to better understand the above technical solution of the present invention and to illustrate further preferred technical solutions, several key components of the battery testing device of the present invention will be described in detail below, and these descriptions are not intended to limit the scope of the present invention.

Pressure cradle head

Referring to fig. 1, 3a to 4b, the pressing mechanism 2 in the battery testing apparatus of the present invention may include a pressing head connected to the pressing member 21. Wherein fig. 3a-3b and fig. 4a-4b are views of the pressure head in different lifting positions, respectively, fig. 3a and fig. 3b are lifting positions of the pressure element 21 in an extended limit state, and fig. 4a and fig. 4b are lifting positions of the pressure element 21 in a retracted limit state. In order to better show the specific structure of the pressure head, the pressure head shown in fig. 3a to 4b is in an inverted state of the pressure head in the mounted state of fig. 1.

The pressure head includes a fixed portion 23 and a head portion 24. Wherein the head part 23 has a screw 233 mounted by a bearing (e.g., a cross roller bearing); the holder 24 is provided with a screw hole in threaded engagement with the screw 233. When the screw 233 is rotated (e.g., by the power device 4), the cradle head 24 can drive the pressing member 21 connected thereto to move in the axial direction of the screw 233, so as to apply pressure to the battery to be tested through the pressing member 21.

Here, the pressure element 21 may be a pressure push plate 21a, a striker, or the like as described above. The pressure cradle head takes the fixing part 23 as a moving frame (for example, the pressure cradle head can be fixed on the equipment shell 3), so that when the screw rod 233 rotates, the cradle head part 24 drives the pressure applying element 21 to apply pressure on the battery to be tested to pierce or press the battery to be tested, and multiple safety testing functions can be realized.

In the illustrated embodiment, the fixing portion 23 includes first and second fixing plates 231 and 232 disposed at intervals such that the screw 233 may be mounted on the first and second fixing plates 231 and 232, i.e., bearings are provided on the first and second fixing plates 231 and 232, respectively, through which the screw 233 is mounted to extend between the first and second fixing plates 231 and 232. The first and second fixing plates 231 and 232 disposed with this interval can define two extreme movement positions of the pan and tilt head 24, respectively. However, the present invention is not limited thereto, and for example, only one fixing plate may be provided, and a screw 233 may be installed on the fixing plate and the upper end wall of the apparatus housing 3, the screw 233 extending above the upper end wall to be drivingly connected to the power output end of the power device 4.

Further, the cradle head portion 24 may include a first cradle platen 241 and a second cradle platen 242 that are disposed at intervals. The screw hole for screw-fitting with the screw rod 233 is provided on the first pan plate 241, that is, the first pan plate 241 is located between the first fixing plate 231 and the second fixing plate 232. In order to transmit power to the second cloud deck 242 when the first cloud deck 241 moves with the rotation of the screw 233, the first and second cloud decks 241 and 242 are connected to each other by a first support rod 243, the first support rod 243 extends through one of the first and second fixing plates 231 and 232, and the extending direction is parallel to the extending direction of the screw 233. Thus, the pressing member 21 may be connected to the side of the second cloud deck 242 facing away from the first cloud deck 241 so as to be able to cause the pressing member 21 to apply pressure to the battery under test when moving. As an alternative embodiment, the pan head 24 may also be provided with only one pan plate, on which a screw hole for screw-fitting with the screw rod 233 is provided, which pan plate may be extended beyond the fixing portion 23 for transmitting power to the pressing element 21 through the pan plate, as in the placement position of fig. 3a, with the first pan plate 241 extending horizontally beyond the second fixing plate 232, so that the pressing element 21 can be directly connected around the second fixing plate 232 without providing the second pan plate 242, the first support rod 243, etc.

During the process of rotating the screw rod 233 and driving the first and second pan plates 241 and 242 to move, friction force between the threads may drive the first and second pan plates 241 and 242 to rotate, so that the rotation motion of the power output end of the power device 4 cannot be well converted into the axial displacement of the pressing element 21 along the extending direction of the screw rod 233. For this purpose, the second fixing plate 232 may be directly fixed to the side wall of the apparatus housing 3. In a preferred embodiment of the present invention, a second support bar 234 may be connected between the first and second fixing plates 231 and 232 such that the second support bar 234 passes through the first cloud deck 241 and extends in a direction parallel to the extension direction of the screw rod 233, so that the first and second fixing plates 231 and 232 are fixed to each other at least in a circumferential direction around the screw rod 241, and the rotation of the first and second cloud decks 241 and 242 is limited only in a direction parallel to the extension direction of the screw rod 233 by the second support bar 234 and the above-mentioned first support bar 243 acting together.

Importantly, in a preferred embodiment of the present invention, the cradle head 24 further includes a pressure transmitting plate 244 for connecting the pressure applying element 21, and the pressure transmitting plate 244 can transmit the reaction force of the battery to be tested to the pressure applying element 21 to the first pressure sensor 22 so as to measure the pressure applied to the battery to be tested. Specifically, the pressure transmitting plate 244 may be disposed at a side of the second cloud deck 242 facing away from the first cloud deck 241 at a distance from the second cloud deck 242, and slidably connected through a connecting rod 245. That is, the pressure transmitting plate 244 can slide toward the second cloud deck 242 along the connecting rod 245 under the reaction force of the battery under test. The first pressure sensor 22 is mounted on a side of the second cloud deck 242 facing the pressure transmitting plate 244, and the pressing member 21 is connected to the pressure transmitting plate 244. Thus, when the screw 233 rotates, the driving force transmitted from the screw 233 can be transmitted to the pressing member 21 through the first pan plate 241, the first support rod 243, the second pan plate 242, the first pressure sensor 22, and the pressure transmitting plate 244 in order (i.e., the connecting rod 245 is not subjected to an axial force when friction force is ignored) to press the battery to be measured. At this time, the force measured by the first pressure sensor 22 is equal to the pressure of the pressing member 21 acting on the battery to be measured. In addition, the pressure transmitting plate 244 can also avoid directly damaging the first pressure sensor 22 and other components of the pressure cradle head when the battery to be tested burns or explodes, thereby prolonging the service life. Typically, the first pressure sensor 22 of the present invention may be a load cell.

Further, a ball joint 246 for connecting the pressing member 21 may be mounted on the pressure transmitting plate 244, which has an advantage in that if the reaction force of the battery to be measured to the pressing member 21 is offset with respect to the screw 233 (i.e., the point of application of the pressure is not on the axis of the screw 233), the reaction force can be transmitted to the first pressure sensor 22 through the ball joint 246 in a direction parallel to the extending direction of the screw 233, thereby accurately measuring the pressure applied to the battery to be measured.

Safety valve

In the battery testing apparatus according to the preferred embodiment of the present invention, referring to fig. 1, 2, 5a and 5b, a safety valve 5 may be installed on the apparatus housing 3 for opening the safety valve 5 to allow the testing chamber 31 to communicate with a space outside the apparatus housing 3 when the air pressure in the testing chamber 31 reaches a set value.

In a preferred embodiment, the safety valve 5 comprises a valve seat 51 and a diaphragm 52. Wherein the valve seat 51 is formed with an intermediate passage 511 therethrough and is capable of being connected to the apparatus housing 3 in various suitable forms; the diaphragm 52 is provided to block communication of the intermediate passage 511. The diaphragm 52 is capable of rupturing under the pressure differential across the intermediate passage 511 when the pressure differential reaches a set point. The maximum pressure allowed by the test chamber 31 can thus be defined by the safety valve 5, avoiding safety problems caused by too high a pressure. The membrane 52 may be made of any suitable material, such as a metal membrane (e.g., aluminum foil), PP membrane, PE membrane, etc.

As described above, the valve seat 51 may be attached to the device housing 3 in a variety of suitable forms, such as welding, screwing, and the like. In the illustrated preferred embodiment, an external thread is formed on the outer peripheral surface of one end portion of the valve seat 51 so as to be screwed into a screw hole formed in the apparatus housing 3. With this arrangement, the safety valve 5 can be easily detached from the apparatus housing 3 for replacement or maintenance.

In the present invention, the diaphragm 52 may be provided in various ways, such as directly bonded to the valve seat 51, as long as it can block the communication of the intermediate passage 511. In the illustrated preferred embodiment, the diaphragm 52 is secured to the valve seat 51 by a hold-down member 53. Specifically, the relief valve 5 includes a packing 53 having an annular shape, the packing 53 being connected to the valve seat 51 and fixing the diaphragm 52 into the intermediate passage 511. For example, the diaphragm 52 may be fixed by the end surface or the peripheral surface of the pressing member 53 being closely fitted with the valve seat 51, which will be described later in detail. Alternatively, the pressing member 53 may fix the diaphragm 52 to one end of the valve seat 51, for example, an internal thread may be formed on the pressing member 53 and engaged with an external thread on the valve seat 51 to press the diaphragm 52 against one end of the valve seat 51.

In a preferred embodiment of the present invention, the diaphragm 52 is fixed by tightly fitting the end surface of the pressing member 53 with the valve seat 51, and referring to fig. 5a, a stepped surface 512 is formed in the middle passage 511 of the valve seat 51, and the pressing member 53 is connected to the middle passage 511 and abuts against the stepped surface 512, so that the connection position of the pressing member 53 can be defined by the stepped surface 512, facilitating a stable connection, so as to clamp and fix the diaphragm 52 between the pressing member 53 and the stepped surface 512.

As described above, the diaphragm 52 of the relief valve 5 is ruptured in use by the pressure difference of the set value, thereby causing the relief valve 5 to fail. For this purpose, the above-mentioned hold-down 53 may be provided to be detachably connected to the valve seat 51, so that only the diaphragm 52 needs to be replaced after the diaphragm 52 is ruptured, without replacing the entire safety valve 5. For example, in the illustrated embodiment, a portion of the intermediate passage 511 adjacent to the outer edge of the stepped surface 512 is formed with an internal thread, and the pressing piece 53 is formed with an external thread so as to be threadably coupled into the intermediate passage 511 and define a connection position by the stepped surface 512. Thus, the diaphragm 52 can be replaced by removing the hold-down member 53 from the valve seat 51.

Here, in order to facilitate the removal of the pressing member 53, a screw-thread removing and fitting structure for fitting with a removing and fitting tool may be formed thereon. The screw-thread assembling and disassembling mating structure may be formed in various suitable forms, such as an inner hole formed in a hexagon so as to be assembled and disassembled by using an inner hexagonal wrench; alternatively, a structure for a dismounting tool, such as a straight groove, is formed on the end face of the pressing member 53 facing away from the step face 512, that is, two groove portions on the same straight line are formed on the end face of the annular pressing member 53 facing away from the step face 512, so that dismounting can be performed by a tool such as a straight screwdriver.

Importantly, the safety valve 5 of the present invention is used to open to release pressure when the pressure in the test chamber 31 is too high, however, the relative tightness should be maintained when the pressure in the test chamber 31 is small to have high test accuracy, for which reason it is necessary to have a good tightness of the safety valve 5 before opening. In a preferred embodiment of the present invention, at least one of the stepped surface 512 of the valve seat 51 and the end surface of the pressing member 53 facing the stepped surface 512 may be formed with a groove portion 512, and the other may be formed with a protrusion portion 531 matching the groove portion 5121. Thus, when the pressing member 53 is connected to abut against the stepped surface 512, the diaphragm 52 can be pressed into the groove portion 5121, and the gas in the test chamber 31 is prevented from overflowing through the connection portion.

By the above-mentioned safety valve 5 connected to the apparatus housing 3, when the air pressure in the test chamber 31 reaches a predetermined value, the safety valve 5 is opened (the diaphragm 52 is ruptured) by the pressure difference to communicate the test chamber 31 with the space outside the apparatus housing 3, and the pressure in the test chamber 31 is released, so that the safety accident caused by the excessive pressure can be avoided by limiting the maximum allowable pressure thereof.

Image pickup apparatus

In the battery testing apparatus according to the preferred embodiment of the present invention, referring to fig. 1, 2, 6a and 6b, an image pickup device 6 for observing the testing state in the testing chamber 31 may be installed on the apparatus housing 3.

The camera device 6 may include a sleeve 63, one end of the sleeve 63 is provided with a camera 64 and is formed with a control line hole 61 extending from the camera 64 to the other end, for example, the camera 64 may be installed at one end where the control line hole 61 is formed, and the other end may serve as a control line introduction port 62 through which a control line can be introduced into the control line hole 61 and connected with the camera 64 so as to observe the change of the battery under test during the test through the camera 64. Here, the sleeve 63 may provide a certain protection for the control line.

As described above, during the battery test, the device housing 3 and the test chamber 31 thereof have a relatively severe test environment, such as high temperature, high pressure, etc., which is liable to cause damage to the camera 64, the control line, etc., and is inconvenient to clearly observe the test state. For this purpose, the invention provides corresponding preferred embodiments, respectively.

To provide better protection for the control wires, to avoid or reduce corrosion, the sleeve 63 may be a stainless steel sleeve for longer service life. The outer peripheral surface portion of the sleeve 63 near the control line introduction port 62 may be formed in a frustum shape tapered toward the control line introduction port 62 to have high structural strength. Although protection may be provided in a number of ways, the camera device 6 is a wearing part of the battery testing apparatus that may be detachably connected to the apparatus housing 3 for ease of replacement or maintenance. For example, an external thread portion 631 may be formed on an outer peripheral surface portion of one end of the sleeve 63 near the camera 64 so as to be capable of being screwed to the apparatus housing 3 and extending the camera 64 into the apparatus housing 3 for observation.

During normal testing, the test chamber 31 should be kept relatively closed to have high testing accuracy, and the problem of tightness caused by connection of the camera device 6 should be reduced as much as possible. For this purpose, a stepped portion 632 adjacent to the male screw portion 631 and facing the camera 64 side may be formed on the sleeve 63, and the stepped portion 632 is provided with a seal ring 65, so that the stepped portion 632 may be sealingly connected to the apparatus housing 3 with the seal ring 65 by pressing the stepped portion 632 toward the apparatus housing 3. The seal ring 65 may be of various suitable materials as long as it has high corrosion resistance, pressure resistance, and high temperature resistance, and typically, the seal ring 65 may be a polytetrafluoroethylene seal ring.

During battery testing, smoke is often present in the test chamber 31, which makes it impossible to clearly observe the test conditions with a conventional camera. Therefore, the invention adopts the infrared camera, so that not only can observation be carried out when smoke exists in the test cavity 31, but also the state information of discharge, internal reaction and the like of the tested battery can be conveniently obtained. The camera 4 faces a relatively more severe testing environment due to the need to face the inside of the testing cavity 31, and for this purpose, can be provided with a quartz glass housing to be able to withstand high temperature and high pressure environments, and to have a prolonged service life.

Through the above-mentioned camera device 6 of connecting on equipment housing 3, can observe discharge, the state when internal reaction and battery take place the safety problem in the battery test process, solve the unable problem of clearly shooting test chamber 31 internal condition under the smog environment to be convenient for learn battery test information more comprehensively.

The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention.

In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. The various possible combinations of the invention are not described in detail in order to avoid unnecessary repetition.

Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.

Claims

1. A battery testing apparatus, characterized in that the battery testing apparatus comprises:

a support heating mechanism (1), the support heating mechanism (1) being capable of supporting and heating a battery to be tested;

a pressing mechanism (2) having a pressing element (21) and a first pressure sensor (22), the pressing element (21) being capable of being driven to approach or depart from the support heating mechanism (1) so as to press the battery under test on the support heating mechanism (1), the first pressure sensor (22) being capable of measuring a pressure from the pressing element (21) received by the battery under test supported on the support heating mechanism (1) when the pressing element (21) approaches the support heating mechanism (1);

the pressing mechanism (2) comprises a pressure head connected to the pressing element (21), the pressure head comprising:

a fixing part (23), wherein the fixing part (23) comprises a first fixing plate (231) and a second fixing plate (232) which are arranged at intervals, and a screw rod (233) which is arranged on the first fixing plate (231) and the second fixing plate (232) through a bearing;

the cradle head part (24), the cradle head part (24) comprises a first cradle platen (241) and a second cradle platen (242) which are arranged at intervals, the cradle head part (24) also comprises a pressure transmitting plate (244) which is arranged at intervals on one side of the second cradle platen (242) and is opposite to the first cradle platen (241), the pressure transmitting plate (244) is connected to the second cradle platen (242) in a sliding way through a connecting rod (245), the first pressure sensor (22) is arranged on one side of the second cradle platen (242) which faces to the pressure transmitting plate (244), and the pressure applying element (21) is a pressure pushing plate (21 a) or a firing pin and is connected to the second cradle platen (242) through the pressure transmitting plate (244) so as to be capable of transmitting driving force to the pressure applying element (21) through the first cradle platen (241), the first supporting rod (243), the second cradle platen (242), the first pressure sensor (22) and the pressure transmitting plate (244) in sequence when the screw rod (233) rotates;

the battery test device comprises a device housing (3) formed with a test cavity (31), the support heating mechanism (1) has a support surface positioned in the test cavity (31), and the pressing element (21) moves in the test cavity (31) to be close to or far away from the support heating mechanism (1);

a safety valve (5) is arranged on the equipment shell (3), and when the air pressure in the test cavity (31) reaches a set value, the safety valve (5) is opened so that the test cavity (31) is communicated with a space outside the equipment shell (3).

2. Battery testing device according to claim 1, characterized in that the support heating mechanism (1) comprises a heating plate (11) and a graphite backing plate (12) for supporting the battery under test, the heating plate (11) having heating wires, the graphite backing plate (12) being arranged in a fitting manner with the heating plate (11) so as to be able to heat the battery under test supported on the graphite backing plate (12) when the heating wires are energized.

3. Battery testing device according to claim 1, characterized in that the device housing (3) comprises an upper sleeve (32) and a lower sleeve (33), the upper sleeve (32) and the lower sleeve (33) having opposite openings and abutting each other, respectively, the pressing mechanism (2) being mounted to an upper end wall of the upper sleeve (32), the support heating mechanism (1) being arranged on an inner side of a lower end wall of the lower sleeve (33).

4. A battery testing device according to claim 3, characterized in that the battery testing device comprises power means (4) for driving the pressing element (21), which power means (4) are arranged on the outer side of the upper end wall of the upper sleeve (32) and are drivingly connected to the pressing element (21).

5. A battery testing device according to claim 3, wherein at least one of a lead hole (321), a temperature sensor (322), a second pressure sensor (323) is provided on an upper end wall of the upper sleeve (32).

6. The battery testing apparatus according to any one of claims 1 to 5, wherein,

the first cloud platen (241) is provided with a screw hole in threaded fit with the screw rod (233), the pressing element (21) is connected to one side, facing away from the first cloud platen (241), of the second cloud platen (242), and the first cloud platen (241) and the second cloud platen (242) are connected with each other through a first supporting rod (243) penetrating through one of the first fixing plate (231) and the second fixing plate (232) and extending in the extending direction parallel to the screw rod (233), so that when the screw rod (233) rotates, the cloud platform (24) drives the pressing element (21) to move along the axial direction of the screw rod (233).

7. Battery testing device according to any of claims 3 to 5, characterized in that the device housing (3) is further provided with camera means (6) for observing the inside of the testing chamber (31), which camera means comprise a stainless steel sleeve, which sleeve is provided at one end with an infrared camera with a quartz glass housing and is formed with a control line hole (61) extending through to the other end, so that at the end of the stainless steel sleeve remote from the infrared camera a control line introduction opening (62) for introducing a control line connected to the infrared camera is formed.