CN210741711U - Electricity core bulging force testing arrangement - Google Patents
Electricity core bulging force testing arrangement Download PDFInfo
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- CN210741711U CN210741711U CN201921521002.XU CN201921521002U CN210741711U CN 210741711 U CN210741711 U CN 210741711U CN 201921521002 U CN201921521002 U CN 201921521002U CN 210741711 U CN210741711 U CN 210741711U
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Abstract
The utility model relates to the technical field of lithium ion batteries, in particular to an electric core expansive force testing device, which comprises a top plate, a movable plate, a bottom plate, a fixed rod, a laser emitter, a scale and a reflector, wherein the top plate, the movable plate and the bottom plate are arranged in parallel from top to bottom; the laser emitter and the scale are arranged oppositely, and light emitted by the laser emitter reaches the reflector through the hollow area and then is reflected to the scale. The expansion force of the battery core can be calculated through the reading difference of the scales before and after the battery core expands and the deformation amount of the elastic piece, the small deformation generated by the battery core expansion can be amplified through the reading difference on the scales, the accuracy of a test result is improved, and the reading error is reduced.
Description
Technical Field
The utility model relates to a lithium ion battery technical field especially relates to an electricity core expansibility testing arrangement.
Background
The lithium ion battery becomes the first choice of new energy vehicles due to the advantages of high specific energy density, long service life and the like. The basic principle of the lithium battery is that the lithium ions are inserted into the negative electrode to store energy during charging and released energy during discharging by means of shuttling effect of the lithium ions at the positive electrode and the negative electrode. In the lithium cell use, the negative pole can appear the inflation bounce-back owing to inlaying the lithium, leads to electric core thickness to increase, and this assembles into electric core group at electric core and will enlarge at double in PACK technology promptly, causes the module to damage easily and unable work, leads to the incident even. If the maximum expansion of the battery core or the maximum stress generated by the expansion can be monitored, a material with corresponding strength is selected when the PACK is designed, and the risk can be reduced to the minimum. The thickness before and after the battery core cycle can be monitored by measuring the thickness expansion of the battery, but the cycle life of the power battery is less, 3000 times and more, 8000 times, so that the thickness measurement becomes a very complicated matter.
Patent 106532156A provides a power battery inflation measuring device, through the plywood setting and the inflation and the thickness change of measuring electric core such as spring, pressure sensor, displacement sensor, has the characteristics that the precision is high, but whole equipment is complicated and need sensor cooperation real-time recording, and is expensive. Patent 201811107820.5 provides a lithium ion battery inflation displacement testing arrangement, through setting up spring and guide pillar scale, can be very convenient reading electric core inflation thickness, but to laminate polymer battery, its thickness is less than or equal to 50mm usually, and the maximum inflation thickness in the life cycle is 7.5mm, and the maximum inflation thickness in the cycle is 1.5mm, consequently, can lead to the error great through the direct reading of guide pillar scale.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: to prior art's not enough, provide an electric core expansibility testing arrangement, can record the inflation state of electric core, can be better provide the support data for PACK design.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a battery cell expansion force testing device comprises a top plate, a movable plate, a bottom plate, a fixed rod, a laser emitter, a scale and a reflector, wherein the top plate, the movable plate and the bottom plate are arranged in parallel from top to bottom, the fixed rod penetrates through the top plate, the movable plate and the bottom plate, an upper locking piece used for fixing the top plate and a lower locking piece used for fixing the bottom plate are arranged on the fixed rod, an elastic piece is connected between the top plate and the movable plate, a hollow area used for laser to pass through is formed in the top plate, the reflector is arranged on the upper surface of the movable plate, and a space for accommodating a battery cell is formed between the bottom plate and the movable plate; the laser emitter and the scale are arranged oppositely, and light emitted by the laser emitter reaches the reflector through the hollow area and then is reflected to the scale.
As an improvement of electric core expansibility testing arrangement, the roof sets up with reciprocating on the dead lever, the bottom plate is fixed to be set up on the dead lever. Battery cells are placed on the bottom plate, and the movable plate and the top plate can be adjusted according to the thickness condition of the soft-package battery cell, so that the test requirements of battery cell expansion force with different thicknesses are met.
As an improvement of the cell expansion force testing device, the upper locking piece is pressed on the upper surface of the top plate. Go up the retaining member and can set up to the nut, apply an initial pressure for the nut, pressure transmission gives the elastic component when the nut is screwed up, and the plywood is given in the elasticity transmission of elastic component, applies on electric core at last, can ensure that the atress of not inflation electric core is even, the measurement of the follow-up electric core dilatancy of being convenient for. The upper clamp applies an initial pressure to the top panel of F0.
As an improvement of electric core expansibility testing arrangement, the quantity of dead lever is 4, the dead lever evenly sets up respectively the roof the fly leaf with four extreme points department of bottom plate.
As an improvement of electric core expansibility testing arrangement, the lower surface of fly leaf with the upper surface of bottom plate is provided with the insulation board respectively, the length of insulation board is more than or equal to the length of electric core, the width of insulation board is more than or equal to the width of electric core. In order to avoid damage to the battery cell caused by direct contact between the movable plate and the battery cell and the bottom plate, the lower surface of the movable plate and the upper surface of the bottom plate are respectively provided with the insulating plates, if the insulating plates are too thick, the expansion force of the battery cell is easily and uniformly distributed, the distribution condition of the expansion force of the battery cell is difficult to accurately measure, and if the insulating plates are too thin, the expansion force distribution accuracy is also influenced by easy deformation after exceeding the bearing force threshold range.
As an improvement of electric core expansibility testing arrangement, still include with dead lever parallel arrangement's first montant and second montant, laser emitter can set up with reciprocating in on the first montant, the scale is fixed set up in on the second montant.
As an improvement of electricity core expansibility testing arrangement, the speculum is right angle prism, the mirror surface and the horizontal direction of speculum form contained angle α, wherein, 0 < α < 90.
As an improvement of electric core expansibility testing arrangement, the laser that laser emitter launches reachs the surface and the horizontal direction of speculum form contained angle β, wherein, 0 < β < 90.
As an improvement of the battery cell expansion force testing device of the utility model, β <90 degrees, 2 α < β when α and β satisfy the formula condition, the scale change is more sensitive than the battery cell thickness change, thereby increasing the reading accuracy.
As an improvement of the battery cell expansive force testing device of the utility model, the elastic part is a spring, and the spring coefficient of the spring is 0.4-0.8N/mm. The elastic coefficient of the spring is in the range, which is beneficial to accurately measuring the expansion force of the battery core. The elastic coefficient of the spring is too small, and the deformation quantity is too small, so that the expansion force error of the battery cell is larger; the elastic coefficient of the spring is too large, the battery core expands little, and the spring generates too large deformation, so that the accuracy of an experimental result can be reduced.
The utility model has the advantages of but not limited to: the utility model discloses on emitting laser earlier to the speculum, being reflected laser by the speculum again to the scale, the expansion force of electric core can be calculated to the reading difference of scale and the deformation volume of elastic component around the rethread electric core inflation, can enlarge the small deformation that electric core inflation produced through the reading on the scale, increases test result's accuracy, reduces reading error. The utility model discloses but the bulging force of real-time recording electricity core, perhaps record the bulging force of electricity core in life cycle or the bulging force of certain period of time in the cycle as required. The utility model discloses simple structure, convenient operation need not adopt complicated pressure sensor and displacement sensor, and the cost is lower.
Drawings
Fig. 1 is a schematic structural diagram of the device of the present invention.
Fig. 2 is a schematic structural diagram of the top plate of the device of the present invention.
Fig. 3 is a schematic diagram of the calculation method of the present invention.
In the figure: 1-top plate, 2-movable plate, 3-bottom plate, 4-fixed rod, 5-upper locking piece, 6-lower locking piece, 7-elastic piece, 8-battery cell, 9-laser emitter, 10-scale, 11-reflector, 12-hollow area, 13-first vertical bar, 14-second vertical bar.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and the accompanying drawings, but the present invention is not limited thereto.
Example 1
As shown in fig. 1-2, a device for testing cell expansion force comprises a top plate 1, a movable plate 2, a bottom plate 3, a fixed rod 4, a laser emitter 9, a scale 10 and a reflector 11, wherein the top plate 1, the movable plate 2 and the bottom plate 3 are arranged in parallel from top to bottom, the fixed rod 4 penetrates through the top plate 1, the movable plate 2 and the bottom plate 3, an upper locking member 5 for fixing the top plate 1 and a lower locking member 6 for fixing the bottom plate 3 are arranged on the fixed rod 4, an elastic member 7 is connected between the top plate 1 and the movable plate 2, a hollow area 12 for laser to pass through is formed in the top plate 1, the reflector 11 is arranged on the upper surface of the movable plate 2, and a space for accommodating a cell 8 is formed between the bottom; the laser emitter 9 and the scale 10 are arranged oppositely, and light emitted by the laser emitter 9 reaches the reflecting mirror 11 through the hollow area 12 and then is reflected to the scale 10.
According to the utility model discloses an in an embodiment of electric core expansibility testing arrangement, roof 1 can set up on dead lever 4 with reciprocating, and bottom plate 3 is fixed to be set up on dead lever 4. Battery cell 8 is put on bottom plate 3, and fly leaf 2 and roof 1 can be adjusted according to the thickness condition of soft-packaged battery cell 8, satisfy the test demand of different thickness battery cell bulging force.
According to the utility model discloses an in an embodiment of electric core bulging force testing arrangement, go up the upper surface of retaining member 5 pressfitting at roof 1. Go up retaining member 5 and can set up to the nut, apply an initial pressure for the nut, pressure transmission when the nut is screwed up gives elastic component 7, and the plywood is given in the elastic transmission of elastic component 7, applies on electric core 8 at last, can ensure that the atress of unexpanded electric core 8 is even, the measurement of the follow-up electric core dilatancy of being convenient for. The initial pressure of upper clamp 5 against top panel 1 is F0.
According to the utility model discloses an in the embodiment of electric core expansibility testing arrangement, the quantity of dead lever 4 is 4, and dead lever 4 evenly sets up four termination points departments at roof 1, fly leaf 2 and bottom plate 3 respectively.
According to the utility model discloses an in the embodiment of electric core expansibility testing arrangement, the lower surface of fly leaf 2 and the upper surface of bottom plate 3 are provided with the insulation board respectively, and the length of insulation board is more than or equal to electric core 8's length, and the width of insulation board is more than or equal to electric core 8's width. In order to avoid damage to the battery cell 8 caused by direct contact between the movable plate 2 and the battery cell 8 and the bottom plate 3, the lower surface of the movable plate 2 and the upper surface of the bottom plate 3 are respectively provided with an insulating plate, if the insulating plate is too thick, the expansion force of the battery cell 8 is easily and uniformly distributed, the distribution condition of the expansion force of the battery cell is difficult to accurately measure, and if the insulating plate is too thin, the expansion force is easily deformed after exceeding the bearing force threshold range, and the distribution accuracy of the expansion force is also influenced.
According to the utility model discloses an in the embodiment of electric core expansibility testing arrangement, still include with dead lever 4 parallel arrangement's first montant 13 and second montant 14, laser emitter 9 can set up on first montant 13 with reciprocating, and scale 10 is fixed to be set up on second montant 14.
In an embodiment of the device for testing cell expansion force according to the present invention, the reflector 11 is a right-angled prism, and the mirror surface of the reflector 11 forms an included angle α with the horizontal direction, wherein 0 ° < α <90 °.
In an embodiment of the device for testing cell expansion force according to the present invention, the surface of the laser beam emitted from the laser emitter 9 reaching the reflector 11 forms an included angle β with the horizontal direction, wherein 0 ° < β <90 °.
In an embodiment of the device for testing cell expansion force according to the present invention, β <90 °, 2 α < β, when α and β satisfy the condition of the formula, the scale change is more sensitive than the thickness change of the cell 8, thereby increasing the reading accuracy.
In an embodiment of the device for testing expansion force of battery cell according to the present invention, the elastic member 7 is a spring, and the spring coefficient of the spring is 0.4-0.8N/mm. The elastic coefficient of the spring is in the range, which is beneficial to accurately measuring the expansion force of the battery cell 8. The elastic coefficient of the spring is too small, and the deformation quantity is too small, so that the expansion force error of the battery cell 8 is larger; the elastic coefficient of the spring is too large, the battery cell 8 expands very little, and the spring generates too large deformation, so that the accuracy of an experimental result can be reduced.
As shown in fig. 3, the utility model discloses the measurement method of electric core bulging force does: place electric core 8 between bottom plate 3 and fly leaf 2, adjust roof 1 and fly leaf 2, make fly leaf 2 hug closely the upper surface of electric core 8 but not to electric core 8 production effort, then fix roof 1, fly leaf 2 and bottom plate 3 respectively on dead lever 4, apply for an initial pressure F0 of last packing member 5, adjust the position of first montant 13 and laser emitter 9's height, make the laser that laser emitter 9 sent can reach on the scale 10 through the reflection of speculum 11 reflection, 10 scales H1 of scale this moment of record, and fix laser emitter 9. And then, the battery cell 8 is charged and discharged, the battery cell 8 expands, the thickness increases, an expansion force is applied to the movable plate 2, the height of the reflector 11 on the movable plate 2 changes along with the expansion force, and the scale of the laser reflected to the scale 10 at the moment is recorded as H2. Therefore, the utility model discloses only need to open laser emitter 9 and measure the change of scale 10 scale, can calculate the expanded change of electricity core 8 through the change of scale 10.
The utility model discloses specific calculation method of electric core expansibility is that the mirror surface and the horizontal direction of speculum 11 form contained angle α, the surface that laser emitter 9 launches reachd speculum 11 forms contained angle β with the horizontal direction, spring elastic coefficient K, the scale of scale 10 is marked as H1 before electric core 8 inflation, the scale of scale 10 is marked as H2 after electric core 8 inflation, then the inflation degree of electric core 8 can be represented by the altitude variation of reflector 11, mark as H, then
Swelling power of battery cell 8
Wherein, as defined as 2 α < β <90 °, thereby obtaining (H2-H1)/H >1, the change of the degree is more sensitive than the change of the expansion thickness of the battery cell 8, thereby increasing the reading precision.
To sum up, the utility model discloses on emitting laser earlier to the speculum, by speculum reflection laser to the scale again, the expansion force of electric core can be calculated to the reading difference of scale and the deformation volume of elastic component around the rethread electric core inflation, can enlarge the small deformation that electric core inflation produced through the reading on the scale, increases test result's accuracy, reduces reading error. The utility model discloses but the bulging force of real-time recording electricity core, perhaps record the bulging force of electricity core in life cycle or the bulging force of certain period of time in the cycle as required. The utility model discloses simple structure, convenient operation need not adopt complicated pressure sensor and displacement sensor, and the cost is lower.
Variations and modifications to the above-described embodiments may become apparent to those skilled in the art from the disclosure and teachings of the above description. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious modifications, replacements or variations made by those skilled in the art on the basis of the present invention belong to the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. The battery cell expansion force testing device is characterized by comprising a top plate, a movable plate, a bottom plate, a fixed rod, a laser emitter, a scale and a reflector, wherein the top plate, the movable plate and the bottom plate are arranged in parallel from top to bottom, the fixed rod penetrates through the top plate, the movable plate and the bottom plate, an upper locking piece used for fixing the top plate and a lower locking piece used for fixing the bottom plate are arranged on the fixed rod, an elastic piece is connected between the top plate and the movable plate, a hollow area used for laser to pass through is formed in the top plate, the reflector is arranged on the upper surface of the movable plate, and a space for accommodating a battery cell is formed between the bottom plate and the movable plate; the laser emitter and the scale are arranged oppositely, and light emitted by the laser emitter reaches the reflector through the hollow area and then is reflected to the scale.
2. The device for testing cell expansion force of claim 1, wherein the top plate is movably disposed on the fixing rod up and down, and the bottom plate is fixedly disposed on the fixing rod.
3. The cell expansion force testing device of claim 1, wherein the upper locking member is press-fitted on the upper surface of the top plate.
4. The battery cell expansion force testing device of claim 1, wherein the number of the fixing rods is 4, and the fixing rods are respectively and uniformly arranged at four end points of the top plate, the movable plate and the bottom plate.
5. The device for testing cell expansion force of claim 1, wherein an insulating plate is disposed on the lower surface of the movable plate and the upper surface of the bottom plate, the length of the insulating plate is greater than or equal to the length of the cell, and the width of the insulating plate is greater than or equal to the width of the cell.
6. The battery cell expansion force testing device of claim 1, further comprising a first vertical rod and a second vertical rod which are parallel to the fixing rod, wherein the laser transmitter is movably arranged on the first vertical rod up and down, and the scale is fixedly arranged on the second vertical rod.
7. The cell expansion force testing device of claim 1, wherein the reflector is a right triangular prism, and a mirror surface of the reflector forms an included angle α with a horizontal direction, wherein 0 ° < α <90 °.
8. The cell expansion force testing device of claim 7, wherein the surface of the mirror where the laser emitted by the laser emitter reaches forms an angle β with the horizontal, wherein 0 ° < β <90 °.
9. The cell expansion force testing device of claim 8, wherein β <90 °, 2 α < β.
10. The cell expansion force testing device of claim 1, wherein the elastic member is a spring, and the spring coefficient of the spring is 0.4-0.8N/mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921521002.XU CN210741711U (en) | 2019-09-12 | 2019-09-12 | Electricity core bulging force testing arrangement |
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| CN201921521002.XU CN210741711U (en) | 2019-09-12 | 2019-09-12 | Electricity core bulging force testing arrangement |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113805090A (en) * | 2021-10-14 | 2021-12-17 | 南京工业大学 | Device and method for aging test of multiple batteries in extrusion state |
| CN114279886A (en) * | 2021-11-24 | 2022-04-05 | 合肥国轩高科动力能源有限公司 | Lithium battery volume swelling degree testing device and testing method |
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2019
- 2019-09-12 CN CN201921521002.XU patent/CN210741711U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113805090A (en) * | 2021-10-14 | 2021-12-17 | 南京工业大学 | Device and method for aging test of multiple batteries in extrusion state |
| CN113805090B (en) * | 2021-10-14 | 2022-07-05 | 南京工业大学 | Device and method for aging test of multiple batteries in extrusion state |
| GB2612437A (en) * | 2021-10-14 | 2023-05-03 | Nanjing University Of Technology | Aging test device for multiple batteries in extruded state and test method |
| GB2612437B (en) * | 2021-10-14 | 2023-12-27 | Nanjing University Of Technology | Aging test device for multiple batteries in extruded state and test method |
| CN114279886A (en) * | 2021-11-24 | 2022-04-05 | 合肥国轩高科动力能源有限公司 | Lithium battery volume swelling degree testing device and testing method |
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