CN220288858U - Internal pressure testing device for battery - Google Patents
Internal pressure testing device for battery Download PDFInfo
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- CN220288858U CN220288858U CN202321696948.6U CN202321696948U CN220288858U CN 220288858 U CN220288858 U CN 220288858U CN 202321696948 U CN202321696948 U CN 202321696948U CN 220288858 U CN220288858 U CN 220288858U
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Abstract
The utility model relates to the technical field of batteries, and discloses a battery internal pressure testing device which comprises a testing component and a ranging component; the test assembly comprises a first test piece and a test piece; the first test piece is used for being fixed in the battery, a first test cavity is formed in the first test piece, the first test cavity comprises a first bottom wall and a first side wall connected to the first bottom wall, and one end, away from the first bottom wall, of the first test cavity is opened to form a first opening; the test piece is arranged in the first test cavity, is in sealing fit with the first side wall and can slide along the first side wall to be close to or far away from the first bottom wall, and the length of the test piece, which is separated from the first bottom wall, is H along the first direction; the distance measuring component is arranged outside the battery and used for acquiring the H; the utility model can effectively avoid the air leakage of the battery in the test process, and has good air tightness and high test accuracy.
Description
Technical Field
The utility model relates to the technical field of battery testing, in particular to a battery internal pressure testing device.
Background
The lithium ion battery generates side reaction to generate gas in the charge and discharge process, so that certain pressure is formed in the battery, the pressure reaches a certain value to cause serious threat to the safety of the battery core, and the possibility of liquid leakage and even explosion is caused; therefore, the measurement of the internal pressure of the battery cell in the charge and discharge process has important guiding significance for the battery cell manufacturing process and product safety performance evaluation.
At present, a pressure sensor is generally adopted to test the internal pressure of a battery, and the method needs to drill a hole in the battery, connect with the pressure sensor through a pipeline, and seal the hole with epoxy glue between the pipeline and the hole so as to avoid gas leakage in the battery; the internal pressure of the battery can be increased along with the test, and in the test mode, in the later test period, the epoxy glue at the sealing position is easy to crack and cause air leakage of the device due to the increase of the pressure; therefore, the internal pressure test device for a battery of the prior art has a defect that the internal pressure test is not accurate due to poor air tightness.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art, and provides a battery internal pressure testing device which can effectively avoid air leakage of a battery in the testing process, and has the advantages of good air tightness and high testing accuracy.
In order to achieve the above object, the present utility model provides a battery internal pressure testing device, comprising a testing component and a ranging component; the test assembly comprises a first test piece and a test piece; the first test piece is used for being fixed to the inside of a battery, a first test cavity extending along a first direction is formed in the first test piece, the first test cavity comprises a first bottom wall and a first side wall connected to the first bottom wall, and one end, away from the first bottom wall, of the first test cavity is opened to form a first opening; the test piece is arranged in the first test cavity, is in sealing fit with the first side wall and can slide along the first side wall to be close to or far away from the first bottom wall, and the length of the test piece, which is separated from the first bottom wall, is H along the first direction; the range finding subassembly is located the outside of battery and is used for acquireing H.
When the internal air pressure of the battery rises, the internal air of the battery enters the first test cavity along the first opening and pushes the test piece to be close to the first bottom wall so as to change the H, and the internal air pressure value of the battery is obtained through calculation based on the change value of the H.
The distance measuring component is a magnetic distance measuring component, and the test piece is a magnetic test piece.
The magnetic ranging component obtains the H according to the relative acting force generated between the magnetic ranging component and the magnetic test piece.
The relative force generated between the magnetic ranging component and the test piece is attractive force.
In some embodiments, the first direction is disposed in the same direction as the direction of gravity; the magnetic ranging assembly comprises a magnet piece, a tension meter and a fixing frame, wherein the tension meter, the magnet piece and the test piece are sequentially arranged from top to bottom along the gravity direction, the tension meter is connected with the fixing frame, and the magnet piece is connected with the stress end of the tension meter and can interact with the magnetic test piece.
It will be appreciated that the interaction of the magnet member with the magnetic test strip means that there is a magnetic force between the magnet member and the magnetic test strip.
Further, the magnet piece is a sheet magnet piece, and along the gravity direction, the projection of the sheet magnet piece on the plane where the magnetic test piece is located at least covers the magnetic test piece.
In some embodiments, the first direction is perpendicular to the gravity direction, the magnetic ranging component comprises a magnet piece and a second test piece, a second test cavity extending along the second direction is formed in the second test piece, the second direction is parallel to the first direction, one end of the second test cavity along the second direction is opened to form a second opening, and the magnet piece is placed in the second test cavity and can interact with the magnetic test piece to move along with the movement of the magnetic test piece.
Further, along the first direction, the length of the first test cavity is L 1 The length of the second test cavity is L 2 The method comprises the following steps: l (L) 2 ≥L 1 。
Further, the second direction is perpendicular to the first plane, along the second direction, the projection area of the second test cavity on the first plane is a, the projection area of the magnet piece on the first plane is b, and the requirements are satisfied: a > b.
Further, the material of second test piece is transparent material, just be provided with the scale mark on the outer wall of second test piece.
In some embodiments, the test device further comprises a foldable sealing bag, wherein the foldable sealing bag is arranged in the first test cavity, one end, close to the first bottom wall, of the foldable sealing bag along the first direction is fixedly connected with the test piece, one end, far away from the first bottom wall, of the foldable sealing bag along the first direction is opened to form a third opening, and the edge of the third opening is fixedly connected with the first side wall; wherein when the internal gas pressure of the battery rises, the internal gas of the battery enters the foldable sealing bag along the third opening to extend the foldable sealing bag in the first direction and push the test piece to slide along the first side wall to be close to the first bottom wall.
Further, along the first direction, the length of the first test cavity is L 1 The method comprises the steps of carrying out a first treatment on the surface of the The length of the foldable sealing bag when unfolded is L 3 The method comprises the steps of carrying out a first treatment on the surface of the The method meets the following conditions: l (L) 3 ≥L 1 。
It will be appreciated that the battery includes a housing, a top cover mounted to the housing and capable of forming a sealed receiving cavity with the housing, and a battery cell disposed in the receiving cavity.
Compared with the prior art, the battery internal pressure testing device disclosed by the embodiment of the utility model has the beneficial effects that: the test assembly may be first mounted to the inside of the case or the inside of the top cover of the battery, and then the top cover may be mounted to the case to seal the test assembly inside the battery, and the distance measuring assembly may be provided outside the battery to detect the length H of the test piece spaced apart from the first bottom wall; when the internal air pressure of the battery rises, the internal air of the battery enters the first test cavity along the first opening and pushes the test piece to be close to the first bottom wall so as to change the H, the length H of the test piece, which is separated from the first bottom wall, is obtained outside the battery through the ranging component so as to obtain a change value of the H in the test process, and the internal pressure value of the battery can be obtained by calculating based on the change value of the H in the test process by utilizing a force balance theorem and an ideal air state equation; therefore, the utility model does not need to punch holes on the battery and connect a pipeline externally, and the whole battery is directly subjected to internal pressure test through the test assembly and the ranging assembly, thereby effectively avoiding air leakage of the battery in the test process, having good air tightness and high test accuracy.
Drawings
Fig. 1 is a block diagram of a battery internal pressure testing device according to an embodiment of the present utility model;
FIG. 2 is a block diagram of a test assembly according to a first embodiment of the present utility model;
fig. 3 is a block diagram of a battery internal pressure testing device according to a second embodiment of the present utility model;
FIG. 4 is a block diagram of a test assembly according to a second embodiment of the present utility model;
FIG. 5 is a block diagram of a first test piece according to a second embodiment of the present utility model;
FIG. 6 is a comparative view of a first test piece and a foldable seal bag according to a second embodiment of the present utility model;
fig. 7 is a block diagram of a battery internal pressure testing apparatus according to a third embodiment of the present utility model;
fig. 8 is a block diagram of a ranging module provided in accordance with a third embodiment of the present utility model;
FIG. 9 is a side view of a distance measuring assembly provided in accordance with a third embodiment of the present utility model;
fig. 10 is a front view of a second test piece provided in a third embodiment of the present utility model.
In the figure, 1, a first test piece; 10. a first test chamber; 11. a first bottom wall; 12. a first sidewall; 13. a first opening;
2. a test piece;
3. a ranging assembly; 31. a magnet member; 32. a tension meter; 33. a fixing frame; 34. a second test piece; 340. a second test chamber; 341. a second bottom wall; 342. a second sidewall; 343. a second opening; 344. scale marks;
4. a foldable sealed bag; 40. a receiving chamber; 41. a third bottom wall; 42. a second sidewall; 43. a third opening;
100. a battery; 101. a housing; 102. a top cover; 103. a battery cell;
20. sealing the cavity; 201. a first side; 202. a second side; 203. a third side;
A. a first direction; B. a second direction; z, the direction of gravity.
Detailed Description
The following describes in further detail the embodiments of the present utility model with reference to the drawings and examples. The following examples are illustrative of the utility model and are not intended to limit the scope of the utility model.
In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions.
Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
In the embodiments of the present application, the same reference numerals denote the same components, and in the interest of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, etc. dimensions of the various components in the embodiments of the present application, as well as the overall thickness, length, width, etc. dimensions of the integrated device, are illustrative only and should not be construed as limiting the present application in any way.
Example 1
As shown in fig. 1-2, a battery internal pressure testing device according to a first embodiment of the present utility model includes a testing component and a ranging component 3; the test assembly comprises a first test piece 1 and a test piece 2; the first test piece 1 is used for being fixed to the interior of the battery 100, a first test cavity 10 extending along a first direction A is formed in the interior of the first test piece 1, the first test cavity 10 comprises a first bottom wall 11 and a first side wall 12 connected to the first bottom wall 11, and one end, away from the first bottom wall 11, of the first test cavity 10 is opened to form a first opening 13; the test piece 2 is arranged in the first test cavity 10, the test piece 2 is in sealing fit with the first side wall 12 and can slide along the first side wall 12 to be close to or far away from the first bottom wall 11, and the length of the test piece 2, which is separated from the first bottom wall 11, is H along the first direction; the distance measuring assembly 3 is provided outside the battery 100 and is used to acquire H.
Referring to fig. 1, a battery 100 includes a case 101, a top cover 102, and a battery cell 103, the top cover 102 being mounted on the case 101 and capable of forming a sealed accommodating chamber with the case 101, the battery cell 103 being disposed in the accommodating chamber.
The working process of the battery internal pressure testing device applying the scheme for testing the battery internal pressure comprises the following steps: firstly, the test assembly is mounted inside the shell 101 or inside the top cover 102 of the battery 100, then the top cover 102 is mounted on the shell 101 to seal the test assembly inside the battery 100, and the distance measuring assembly 3 is arranged outside the battery 100 to detect the distance H between the test piece 2 and the first bottom wall 11; when the internal air pressure of the battery 100 rises, the internal air of the battery 100 enters the first test cavity 10 along the first opening 13 and pushes the test piece 2 to be close to the first bottom wall 11 to change H, the length H of the test piece 2, which is separated from the first bottom wall 11, is obtained outside the battery through the ranging component 3 to obtain a change value of H in the test process, and the internal pressure value of the battery can be obtained by utilizing the force balance theorem and an ideal air state equation based on the change value operation of H in the test process; therefore, the utility model can directly test the internal pressure of the whole battery 100 through the test assembly and the distance measuring assembly 3, effectively avoid the air leakage of the battery 100 in the test process, and has good air tightness and high test accuracy.
It will be appreciated that the inside of the top cover 102 refers to the side of the top cover 102 facing the receiving chamber, and the outside of the top cover 102 refers to the side of the top cover 102 facing away from the receiving chamber.
It will be appreciated that the size of the first test piece 1 is designed according to the size of the accommodation space in the accommodation chamber that can be used for mounting the first test piece 1.
The distance measuring component 3 is a magnetic distance measuring component, and the test piece 2 is a magnetic test piece. The magnetic ranging component obtains H according to the relative acting force generated between the magnetic ranging component and the magnetic test piece.
The relative force generated between the magnetic ranging component and the test piece is attractive force.
Referring to fig. 1, the test piece 2, the first bottom wall 11 and the first side wall 12 enclose a sealed cavity 20, and a length H of the test piece 2 spaced from the first bottom wall 11 is a length of the sealed cavity 20 along the first direction a.
Of course, the distance measuring assembly 3 may also adopt other wireless nondestructive detection modes to obtain the length H, for example, an inductor is mounted on the test piece 2 to detect the length H of the test piece 2 spaced from the first bottom wall 11, and a receiver matched with the inductor is disposed outside the battery 100 to obtain the length H of the test piece 2 spaced from the first bottom wall 11. The function of obtaining the distance H between the test strip 2 and the first bottom wall 11 in other wireless and nondestructive manners without departing from the technical principle of the present utility model should be considered as the protection scope of the present utility model.
Referring to fig. 1 and 2, in the present embodiment, a first direction a is disposed in the same direction as a gravitational direction Z; the magnetic ranging assembly comprises a magnet piece 31, a tension meter 32 and a fixing frame 33, wherein the tension meter 32, the magnet piece 31 and the test piece 2 are sequentially arranged from top to bottom along the gravity direction Z, the tension meter 32 is connected to the fixing frame 33, and the magnet piece 31 is connected to the stress end of the tension meter 32 and can interact with the magnetic test piece.
It will be appreciated that the interaction of magnet member 31 with the magnetic test strip means that there is a magnetic force between magnet member 31 and the magnetic test strip.
The magnet member 31 is a sheet-like magnet member, and the projection of the sheet-like magnet member on the plane of the magnetic test piece in the gravity direction Z covers at least the magnetic test piece. The design is to generate a relative force between the whole surface of the test piece 2 and the magnet piece 31, so that when the test piece 2 slides along the first test cavity 10, the tension meter 32 can be correspondingly changed according to the change of the relative force between the magnet piece 31 and the test piece 2, so as to improve the accuracy of the internal pressure test of the battery.
In other embodiments, magnet member 31 may have any shape, such as trapezoidal, spherical, etc.
In this embodiment, the first test piece 1 is a first transparent measuring cylinder with scale marks, the first test cavity 10 is a hollow structure of the first transparent measuring cylinder, the first opening 13 is a cylinder opening of the first transparent measuring cylinder, the first bottom wall 11 is a cylinder bottom wall of the first transparent measuring cylinder, and the first side wall 12 is a cylinder side wall of the first transparent measuring cylinder. The first transparent measuring cylinder with a proper size is selected according to the size of the accommodating space in the accommodating cavity, wherein the accommodating space can be used for installing the first test piece 1.
In this embodiment, the tension meter 32 is a digital display tension meter.
In the present embodiment, the opposing force generated between the magnet member 31 and the test piece 2 is a mutual attractive force.
In this embodiment, the test piece 2 is a sheet-like magnet member having a uniform thickness.
In the present embodiment, the first test piece 1 is adhesively fixed to the inner side of the top cover 102.
In other embodiments, the first test piece 1 is adhesively secured to the inner sidewall of the housing 101.
The relative force generated between the magnet piece 31 and the test piece 2 is F 3 The tension meter 32 has a tension reading F 4 The method comprises the steps of carrying out a first treatment on the surface of the When the internal pressure of the battery 100 increases, H changes to cause F 3 Change F 3 The change results in F 4 Change based on H and F 4 The correspondence between them to obtain H.
In this example, a plurality of pull force versus distance experiments were used and H-F was plotted 4 Obtaining H and F by corresponding relation diagram 4 Correspondence between them.
Multiple tensile force and distance relation tests are adopted and H-F is drawn 4 The specific steps of the mode of the corresponding relation diagram of (a) are as follows:
fixing the tension meter 32 on the fixing frame 33, fixing the magnet piece 31 on the lower end of the tension meter 32, fixing the first test piece 1 on a cover plate for simulating an obstacle formed between the first test piece 1 and the magnet piece 31 by the battery 100, placing the test piece 2 into the first test cavity 10, applying external force to enable the test piece 2 to slide along the first test cavity 10 for a plurality of preset distances, and sequentially recording F passing each preset distance 4 And H, a plurality of F which are correspondingly obtained from a plurality of preset distances 4 And H is filled in H-F in a coordinate point manner 4 In the coordinate system, a plurality of coordinate points are sequentially connected into a line to obtain H-F 4 Is a correspondence map of (a).
In the present embodiment, since the first test piece 1 is adhesively fixed to the inner side of the top cover 102, the H-F is tested and plotted using a plurality of tensile force versus distance 4 In the form of the correspondence map of (a), a cover plate is used to simulate the top cover 102 of the battery 100, the cover plateThe thickness was consistent with the thickness of top cover 102, and during the test, the relative distance of the cover plate to magnet piece 31 was consistent with the relative distance of top cover 102 to magnet piece 31 along the direction of gravity Z.
In this example, H-F was tested and plotted using multiple pull and distance tests 4 In the manner of the correspondence map of (a), by fixing the test piece 2 on one end of a plastic rod, an external force is applied by the plastic rod to enable the test piece 2 to slide along the first test cavity 10, so that the test piece 2 can slide along the first test cavity 10 for a plurality of preset distances.
Example two
Referring to fig. 3-6, unlike the first embodiment, the device for testing internal pressure of a battery according to the second embodiment of the present utility model further includes a foldable sealing bag 4, wherein the foldable sealing bag 4 is disposed in the first testing chamber 10, one end of the foldable sealing bag 4, which is close to the first bottom wall 11 along the first direction a, is fixedly connected with the test strip 2, one end of the foldable sealing bag 4, which is far from the first bottom wall 11 along the first direction a, is opened to form a third opening 43, and an edge of the third opening 43 is fixedly connected with the first side wall 12; wherein when the internal air pressure of the battery 100 rises, the internal air of the battery 100 enters the foldable sealing bag 4 along the third opening 43 to stretch the foldable sealing bag 4 in the first direction a and push the test piece 2 to slide along the first side wall 12 to approach the first bottom wall 11.
The foldable sealing bag 4 comprises a containing cavity 40, the containing cavity 40 comprises a third bottom wall 41 and a third side wall 42 connected to the third bottom wall 41, the third bottom wall 41 is fixedly connected with the test piece 2, one end of the third side wall 42 away from the third bottom wall 41 is fixedly connected with the first side wall 12, and one end of the containing cavity 40 away from the third bottom wall 41 is opened to form a third opening 43.
Alternatively, the collapsible sealing bag 4 may be made of any volume-variable material such as PP film, PVC film, PET film, rubber, etc.
Because it is difficult to consider that the test piece 2 maintains tightness during the sliding process of the first test cavity 10, the test piece 2 may be in communication with the interior of the battery due to a gap between the test piece 2 and the inner wall of the first test cavity 10 during the sliding process, and a test error of the internal pressure of the battery is increased, the foldable sealing bag 4 is additionally arranged, so that the sealing cavity 20 cannot be in communication with the interior of the battery 100 during the sliding process of the test piece 2, that is, internal gas of the battery 100 is prevented from entering the sealing cavity 20 along the gap between the test piece 2 and the inner wall of the first test cavity 10, and the test error of the internal pressure of the battery is reduced.
Referring to fig. 5 and 6, in the present embodiment, the first direction a and the second direction B are parallel, and the length of the first test chamber 10 along the first direction a is L 1 The method comprises the steps of carrying out a first treatment on the surface of the The length L of the foldable sealing bag 4 when unfolded 3 The method comprises the steps of carrying out a first treatment on the surface of the The method meets the following conditions: l (L) 3 ≥L 1 . By L 3 ≥L 1 So that the test piece 2 can move any distance in the first test cavity 10, and the resistance to the movement of the test piece 2 caused by insufficient length of the foldable sealing bag 4 is avoided, so that the internal pressure test error of the battery is reduced.
Example III
Referring to fig. 7-10, unlike the embodiment, the magnetic ranging component 3 includes a magnet 31 and a second test piece 34, the second test piece 34 is internally provided with a second test cavity 340 extending along a second direction B, the second direction B is parallel to the first direction a, one end of the second test cavity 340 along the second direction B is opened to form a second opening 343, and the magnet 31 is disposed in the second test cavity 340 and can interact with the magnetic test piece to move along with the movement of the magnetic test piece.
The first direction A and the second direction B are horizontal directions, and the gravity direction Z is vertical direction.
The second testing chamber 340 includes a second bottom wall 341 and a second side wall 342 connected to the second bottom wall 341.
The relative acting force generated by the magnet piece 31 and the test piece 2 is F 3 ，F 3 The magnet member 31 can be made to move following the movement of the test piece 2 so that the position of the magnet member 31 corresponds to the position of the test piece 2, and when the internal pressure of the battery 100 rises, the movement distance of the test piece 2 is Y 1 The moving distance of the magnet member 31 is Y 2 ，Y 2 ＝Y 1 Based on Y 2 H was obtained.
Referring to fig. 6 and 7, and as will be appreciated in conjunction with fig. 2, the first test chamber 10 has a length L in a first direction a 1 The second test chamber 340 has a length L 2 The method comprises the following steps: l (L) 2 ≥L 1 . The design is such that when the test strip 2 moves any distance in the first test chamber 10, the magnet member 31 can also move any distance in the second test chamber 340 following the test strip 2.
The second test piece 34 is made of transparent material, and scale marks 344 are arranged on the outer wall of the second test piece 34. The second test piece 34 made of the magnet piece 31 and the transparent material can utilize the relative acting force between the magnet piece 31 and the test piece 2 so that the tester can pass through the position and the moving distance Y of the magnet piece 31 2 Knowing the position and the movement distance Y of the test piece 2 1 So that H can be known and an internal pressure value of the battery 100 can be obtained based on the H operation.
Graduation marks 344 of the second test piece 34 are provided on the second side wall 342.
In the present embodiment, the second test piece 34 is provided on the outside of the top cover 102 of the battery 100.
In other embodiments, the second test piece 34 is disposed on the outer side wall of the case 101 of the battery 100.
The second direction B is perpendicular to the first plane, and along the second direction B, the projection area of the second test cavity 340 on the first plane is a, and the projection area of the magnet member 31 on the first plane is B, which satisfies the following conditions: a > b. The design is adopted to avoid the sealing fit between the magnet piece 31 and the second side wall 342 to cause the magnet piece 31 to form a closed space with the second test cavity 340 in the second test cavity 340, the closed space has internal pressure, and the internal pressure can bring resistance to the movement of the magnet piece 31, so that the resistance of the movement of the magnet piece 31 in the second test cavity 340 with a being larger than b is adopted, and the test error in the battery internal pressure test process is reduced.
When the projection of the second test cavity 340 on the first plane is circular, the radius of the projection of the cell can be measured by any length measuring tool such as a ruler, a tape measure, etc., and then the radius can be measured by a circular area calculation formula (circular area=pi×radius).
It can be understood that, when the projection of the second test cavity 340 on the first plane is square, the length and width of the cell projection can be measured by any length measuring tool such as a ruler, a tape measure, etc., and then the area of the cell projection can be calculated by a square area calculation formula (square area=length×width).
Similarly, when the projection of the second test cavity 340 on the first plane is of any shape, the area of the projection of the battery cell can be calculated by an area calculation formula corresponding to the specific shape of the projection of the second test cavity 340.
In this embodiment, the magnet member 31 is a spherical magnet member, the second testing chamber 340 is a circular chamber, and the outer diameter of the magnet member 31 is smaller than the inner diameter of the second testing chamber 340.
In other embodiments, magnet member 31 may have any shape, such as square, trapezoid, oval, etc.
In this embodiment, the second test piece 34 is a second transparent measuring cylinder with scale marks, the second test cavity 340 is a hollow structure of the second transparent measuring cylinder, the second opening 343 is a cylinder opening of the second transparent measuring cylinder, the second bottom wall 341 is a cylinder bottom wall of the second transparent measuring cylinder, and the second side wall 342 is a cylinder side wall of the second transparent measuring cylinder.
The utility model provides a testing method of a battery internal pressure testing device, which comprises the following steps:
and (3) installing a testing assembly: fixing the first test piece 1 to the inside of the battery 100;
installing a ranging assembly 3: the distance measuring assembly 3 is arranged outside the battery 100 and is used for acquiring the length H of the test piece 2 separated from the first bottom wall 11;
obtaining H: h at initial state of battery 0 After waiting for a preset time t, obtaining H t ；
Obtaining an internal pressure value of the battery 100: based on H 0 And H t And operated to obtain the internal pressure value of the battery 100.
Based on h=h according to force balance law and ideal gas state equation 0 And H=H t The specific principle of the operation to obtain the internal pressure value of the battery is as follows:
the surface of the test piece 2 facing the first bottom wall 11 is a first side surface 201, the surface of the test piece 2 facing away from the first bottom wall 11 is a second side surface 202, the surface of the first bottom wall 11 facing the test piece 2 is a third side surface 203, and the area of the first side surface 201 is S 1 The second side 202 has an area S 2 The area of the third side surface 203 is S 3 ，S 1 ＝S 2 ＝S 3 Volume V of the seal chamber 20 2 ＝S 1 H。
Wherein V is 2 ＝S 1 H,F 1 ＝P 1 S 2 ，F 2 ＝P 2 S 1 ，S 1 ＝S 2 ，F 4 ＝F 3 +F 5 ；
The internal pressure of the battery at the time t is P 1t The method comprises the steps of carrying out a first treatment on the surface of the The preset pressure of the initial state of the seal chamber 20 is P 20 The internal pressure of the seal chamber 20 at time t is P 2t The initial state of the seal cavity 20 has a length H 0 The length of the seal cavity 20 at time t is H t The initial state of the seal cavity 20 has a volume V 20 The volume of the seal chamber 20 at time t is V 2t 。
From the ideal gas state equation, P 20 V 20 ＝P 2t V 2t ；
And due to V 20 ＝S 1 H 0 ；V 2t ＝S 1 H t ；
Thus can obtain P 20 H 0 ＝P 2t H t ；
In the above formula, P 1 Is the internal pressure of the battery 100;
P 2 is the internal pressure of the sealed chamber 20;
V 2 is the volume of the sealed cavity 20;
S 1 is the area of the first side 201 (which may be measured according to the specific shape and specific dimensions of the first side 201);
S 2 is the area of the second side 202 (which may be measured according to the specific shape and specific dimensions of the first side 201);
F 1 pressure applied to second side 202 for the interior of battery 100;
F 2 pressure applied to the first side 201 for sealing the interior of the cavity 20;
F 3 is the relative force between magnet 31 and test piece 2;
F 4 a tension reading for the tension meter 32;
F 5 is the weight of magnet 31 (as measured when made from a particular material);
F 6 to test the weight of the sheet 2 (obtained by measurement when manufactured according to the particular material).
In the first and second embodiments, since the first test piece 1 is arranged along the gravity direction Z, the first opening 13 is the lower end of the first test chamber 10, the first bottom wall 11 is the upper end of the first test chamber 10, and is based on H and F 4 The correspondence relationship between the magnet piece 31 and the test piece 2 is based on the principle that the relative acting force between the magnet piece 31 and the test piece 2 is reduced along with the increase of the relative distance between the magnet piece 31 and the test piece 2, so that the larger the relative distance between the magnet piece 31 and the test piece 2 is, the smaller the H is, resulting in H and F 3 The greater H is present between F 3 Smaller H is smaller F 3 The larger the correspondence; therefore, the weight F of the test piece 2 needs to be considered 6 And the opposing force F between magnet member 31 and test piece 2 3 Influence of stress balance on the test piece 2;
the stress balance relation of the test piece 2 in the gravity direction Z can be obtained according to the force balance law to be F 1 ＝F 2 +F 6 -F 3 ；
Bond F 1 ＝P 1 S 2 ，F 2 ＝P 2 S 1 ，P 20 H 0 ＝P 2t H t ,S 1 ＝S 2 ，F 4 ＝F 3 +F 5 The method comprises the steps of carrying out a first treatment on the surface of the Can calculate and obtain the internal pressure value, P, of the battery 100 at the time t 1t ＝P 20 H 0 /H t +(F 6 -F 4 +F 5 )/S 1 。
In other embodiments, since the first test piece 1 is disposed along the gravity direction Z, the first opening 13 is the upper end of the first test chamber 10, the first bottom wall 11 is the lower end of the first test chamber 10, and the force balance relationship of the test piece 2 in the gravity direction (Z) is F according to the force balance law 1 ＝F 2 -F 3 -F 6 ；
Can calculate and obtain the internal pressure value of the battery at the time t, P 1t ＝P 20 H 0 /H t -(F 6 +F 4 -F 5 )/S 1 。
In the third embodiment, since the first test piece 1 is arranged perpendicular to the gravitational direction Z, and is not based on H and F 3 The corresponding relation between the two components is used for obtaining H, and the weight F of the test piece 2 can be ignored 6 And the opposing force F between magnet member 31 and test piece 2 3 Influence of stress balance on the test piece 2;
according to the force balance law, the stress balance relation of the test piece 2 in the direction vertical to the gravity direction Z is F 1 ＝F 2 ；
Bond F 1 ＝P 1 S 2 ，F 2 ＝P 2 S 1 ，P 20 H 0 ＝P 2t H t ,S 1 ＝S 2 ；
Can calculate and obtain the internal pressure value, P, of the battery 100 at the time t 1t ＝P 20 H 0 /H t 。
In summary, the device for testing the internal pressure of the battery provided by the embodiment of the utility model has the following beneficial effects:
1. when the internal pressure of the battery 100 rises, the internal gas of the battery 100 can enter the communication cavity 22 to push the test piece 2 to approach the first bottom wall 11 along the first direction A in the first test cavity 10 so as to test the length H of the space between the test piece 2 and the first bottom wall 11, the changed H is obtained through the ranging component 3, the internal pressure value of the battery 100 is obtained based on H operation by utilizing the force balance law and the ideal gas state equation, the internal pressure of the battery 100 can be tested in a nondestructive testing mode, the top cover 102 is not required to be damaged by punching processing on the battery 100 as in the prior art, the internal pressure of the whole battery 100 is directly tested through the testing component and the ranging component 3, the air leakage of the battery in the testing process is effectively avoided, the air tightness is good, and the testing accuracy is high.
2. Adopt magnetic force range finding subassembly and magnetic material's test piece 2, can utilize magnetic force in order to acquire H, need not range finding subassembly 3 direct contact test subassembly, need not to punch in the test process of battery 100 internal pressure and destroy the top cap 102 of battery 100, realize the nondestructive wireless detection of battery internal pressure.
3. The adoption of the foldable sealing bag 4 can avoid the communication between the sealing cavity 20 and the inside of the battery 100 in the sliding process of the test piece 2, and reduce the testing error of the internal pressure of the battery.
The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present utility model, and these modifications and substitutions should also be considered as being within the scope of the present utility model.
Claims (10)
1. A battery internal pressure testing device, characterized by comprising:
the test assembly comprises a first test piece (1) and a test piece (2);
the first test piece (1) is used for being fixed to the inside of the battery (100), a first test cavity (10) extending along a first direction (A) is formed in the inside of the first test piece (1), the first test cavity (10) comprises a first bottom wall (11) and a first side wall (12) connected to the first bottom wall (11), and one end, far away from the first bottom wall (11), of the first test cavity (10) is opened to form a first opening (13);
the test piece (2) is arranged in the first test cavity (10), the test piece (2) is in sealing fit with the first side wall (12) and can slide along the first side wall (12) to be close to or far away from the first bottom wall (11), and the length of the test piece (2) which is separated from the first bottom wall (11) along the first direction is H;
and a distance measuring unit (3) provided outside the battery (100) and configured to acquire the H.
2. The device according to claim 1, wherein the distance measuring unit (3) is a magnetic distance measuring unit and the test piece (2) is a magnetic test piece.
3. The battery internal pressure testing device according to claim 2, wherein the first direction (a) is disposed in the same direction as the gravitational direction (Z); the magnetic ranging assembly comprises a magnet piece (31), a tension meter (32) and a fixing frame (33), wherein the tension meter (32), the magnet piece (31) and the test piece (2) are sequentially arranged from top to bottom along the gravity direction (Z), the tension meter (32) is connected to the fixing frame (33), and the magnet piece (31) is connected to the stress end of the tension meter (32) and can interact with the magnetic test piece.
4. A device according to claim 3, wherein the magnet member (31) is a sheet-like magnet member, and a projection of the sheet-like magnet member on a plane in which the magnetic test piece is located covers at least the magnetic test piece in the gravitational direction (Z).
5. The device according to claim 2, wherein the first direction (a) is perpendicular to the gravity direction (Z), the magnetic ranging unit (3) comprises a magnet member (31) and a second test piece (34), a second test cavity (340) extending along a second direction (B) is formed in the second test piece (34), the second direction (B) is parallel to the first direction (a), a second opening (343) is formed by opening one end of the second test cavity (340) along the second direction (B), and the magnet member (31) is placed in the second test cavity (340) and can interact with the magnetic test piece to move along with the movement of the magnetic test piece.
6. The internal battery pressure testing device according to claim 5, wherein along said first directionIn the direction (A), the length of the first test cavity (10) is L 1 The length of the second test cavity (340) is L 2 The method comprises the following steps: l (L) 2 ≥L 1 。
7. The battery internal pressure testing device according to claim 5, wherein the second direction (B) is perpendicular to a first plane, a projected area of the second testing chamber (340) on the first plane is a, and a projected area of the magnet member (31) on the first plane is B along the second direction (B), satisfying: a > b.
8. The device according to claim 5, wherein the material of the second test piece (34) is transparent, and graduation marks (344) are provided on the outer wall of the second test piece (34).
9. The internal battery pressure testing device according to any one of claims 1 to 8, further comprising a foldable sealing bag (4), wherein the foldable sealing bag (4) is disposed in the first testing chamber (10), one end of the foldable sealing bag (4) close to the first bottom wall (11) along the first direction (a) is fixedly connected with the testing sheet (2), one end of the foldable sealing bag (4) far away from the first bottom wall (11) along the first direction (a) is opened to form a third opening (43), and an edge of the third opening (43) is fixedly connected with the first side wall (12);
wherein when the internal gas pressure of the battery (100) rises, the internal gas of the battery (100) enters the foldable sealing bag (4) along the third opening (43) to stretch the foldable sealing bag (4) in the first direction (a) and push the test piece (2) to slide along the first side wall (12) to be close to the first bottom wall (11).
10. The device according to claim 9, wherein the first test chamber (10) has a length L in the first direction (a) 1 The method comprises the steps of carrying out a first treatment on the surface of the The length of the folded sealing bag (4) when unfolded is L 3 The method comprises the steps of carrying out a first treatment on the surface of the Satisfy the following requirements：L 3 ≥L 1 。
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321696948.6U CN220288858U (en) | 2023-06-29 | 2023-06-29 | Internal pressure testing device for battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321696948.6U CN220288858U (en) | 2023-06-29 | 2023-06-29 | Internal pressure testing device for battery |
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