CN114440754B - Device and method capable of testing expansion amounts of multiple batteries under different pressures - Google Patents
Device and method capable of testing expansion amounts of multiple batteries under different pressures Download PDFInfo
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- CN114440754B CN114440754B CN202110968311.7A CN202110968311A CN114440754B CN 114440754 B CN114440754 B CN 114440754B CN 202110968311 A CN202110968311 A CN 202110968311A CN 114440754 B CN114440754 B CN 114440754B
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- 238000012360 testing method Methods 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000003825 pressing Methods 0.000 claims abstract description 87
- 239000011229 interlayer Substances 0.000 claims abstract description 58
- 238000006073 displacement reaction Methods 0.000 claims abstract description 40
- 230000008569 process Effects 0.000 claims abstract description 15
- 230000000712 assembly Effects 0.000 claims description 19
- 238000000429 assembly Methods 0.000 claims description 19
- 230000009286 beneficial effect Effects 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 4
- 238000011161 development Methods 0.000 description 7
- 230000008901 benefit Effects 0.000 description 6
- 238000013461 design Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 125000004122 cyclic group Chemical group 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 238000009826 distribution Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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- 230000008094 contradictory effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
- G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
- G01B7/10—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using magnetic means, e.g. by measuring change of reluctance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/06—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/06—Systems determining position data of a target
- G01S17/08—Systems determining position data of a target for measuring distance only
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- Battery Mounting, Suspending (AREA)
Abstract
The invention provides a device and a method for testing the expansion of a plurality of batteries under different pressures, wherein the device comprises a base, a bracket retainer and a guide rod vertically fixed on the base; a plurality of movable pressing plate components and a displacement reader on the movable pressing plate; the base and the first movable pressing plates and every two adjacent movable pressing plates are clamped with batteries, a plurality of interlayer batteries are connected in series, constant pressure born by each interlayer battery is equal to the weight combination above the interlayer battery, constant pressure born by batteries of different interlayers is different, expansion of each interlayer battery in the charge-discharge circulation process is obtained through a plurality of displacement readers, and then the optimal constant pressure value of the batch of batteries is screened out.
Description
Technical Field
The invention relates to the technical field of battery development, in particular to a device and a method capable of testing expansion amounts of a plurality of batteries under different pressures.
Background
In the development process of lithium batteries, the expansion amount and the cycle life of the batteries are obviously influenced by the pressure born by the batteries. It is important to test the effect of different pressures experienced by a lithium battery during charge and discharge cycles on the amount of expansion and cycle life. At present, a method for applying constant pressure to a battery and testing the expansion amount in the charge-discharge cycle process generally adopts a servo motor or an electric cylinder and the like to apply pressure, the pressure born by the battery is collected through a pressure sensor, and the reduction amount is regulated through a control system to adjust the servo motor or the electric cylinder so as to ensure that the battery bears the constant pressure. While the amount of expansion of the battery was measured by a displacement reader mounted on the battery. The testing method has the problems of high implementation difficulty, complex control and high cost, and can be used for testing only one battery.
The application number is as follows: the Chinese patent of CN201922024734.4 discloses a square lithium battery electrical property circulation testing device, which comprises a bottom plate, wherein the upper surface of the bottom plate is fixedly connected with a fixed end plate and an opening end plate which are distributed in parallel, at least one movable pressing plate is arranged between the fixed end plate and the opening end plate in parallel, guide rods symmetrically penetrate through the movable pressing plate, and two ends of each guide rod are respectively fixedly connected with the fixed end plate and the opening end plate; an L-shaped pressing plate which transversely moves relative to the movable pressing plate is arranged on one side of the opening end plate, a notch for the L-shaped pressing plate to pass through is formed in the opening end plate, and a pressure sensor is arranged on the surface of the L-shaped pressing plate, facing the movable pressing plate; the bottom plate is also fixed with a driving device for transversely moving the L-shaped pressing plate.
The Chinese patent with the application number of CN201811644548.4 discloses a method for testing the expansion force of a battery module, which comprises the following steps: step S210: manufacturing a plurality of identical battery modules; step S220: respectively placing each battery module into a measuring clamp of the expansion force testing device, applying initial pretightening force values with different sizes to the battery modules, and setting a data sampling period and a data display format in a pressure sensor display instrument of the expansion force testing device; step S230: connecting the anode and the cathode of the corresponding battery module with the charge and discharge test cabinet, measuring the expansion force value of the battery module under each initial pretightening force value, and reading the expansion force value in the pressure sensor display instrument; step S240: and obtaining a change curve of the expansion force according to expansion force values corresponding to the initial pretightening force values. In step S220, initial pre-tightening force values of different magnitudes are applied to the battery module 10 by adjusting the position of the lead screw 8 of the expansion force testing device. By the method, different initial pretightening forces can be adjusted for all the battery modules 10 by adjusting the screw rod 8 by using one expansion force testing device.
And the following steps: chinese patent application No. cn201910038216.X discloses a battery expansion force measuring device, the battery expansion force measuring device includes: a support stand; at least two guide rods; the first movable flat plate and the second movable flat plate are perpendicular to the guide rod and respectively penetrate through the guide rod, and the first movable flat plate is suitable for being in contact with a battery arranged between the first movable flat plate and the base; a force sensor disposed between the first movable plate and the second movable plate, the force sensor adapted to detect a force of a battery surface; a force sensor array disposed on a bottom surface of the first movable plate, the force sensor array adapted to detect a force distribution of a battery surface; and the data acquisition and processing device is respectively and electrically connected with the force sensor, the force sensor array and the micro-displacement adjusting device, and is suitable for receiving force signals from the force sensor, force distribution signals from the force sensor array and displacement signals from the micro-displacement adjusting device and sending control signals to the micro-displacement adjusting device.
From the above, it can be seen that: the prior art is used for testing the expansion force of the battery by adjusting the pressing down amount of a servo motor or an electric cylinder through a control system so as to ensure that the battery bears constant pressure, and when the constant pressure is changed, the pressing down amount of the servo motor or the electric cylinder is also required to be adjusted, and the expansion amount of a plurality of interlayer batteries can not be tested at the same time under different pressures.
Disclosure of Invention
In view of the above, the invention provides a device and a method for testing the expansion amount of a plurality of batteries under different pressures, the batteries of different interlayers are simultaneously subjected to different constant pressures through the constant pressure born by the batteries of each interlayer being equal to the weight combination above the batteries of the interlayers, and the expansion amount of the batteries of each interlayer in the charge and discharge cycle process is respectively obtained through a plurality of displacement readers, so that the beneficial effects of simultaneously testing the expansion amount of the batteries of the interlayers under different pressures are realized, and the device and the method have the advantages of high testing efficiency, high precision, low cost, strong practicability, simplicity in operation and the like, and further solve the problems of complex operation, high implementation difficulty, high cost, low testing efficiency and low precision in the prior art.
In order to achieve the above object, according to one aspect of the present invention, there is provided an apparatus for testing the expansion of a plurality of batteries under different pressures, comprising a base, a rack holder, at least two guide rods vertically fixed to the base, wherein a test space is formed between the rack holder and the base; the movable pressing plate assemblies comprise movable pressing plates and displacement readers arranged on the movable pressing plates, the movable pressing plates slide up and down along the guide rods, and interlayer batteries are clamped between the base and the first movable pressing plate and between two adjacent movable pressing plates;
the displacement reader reads the expansion amount of the interlayer battery below the displacement reader in the charge-discharge cycle process.
Further, the weight combination above a certain one of the sandwich cells is the sum of the weight of all the movable platen assemblies above that sandwich cell and the weight of all the sandwich cells.
Further, in the movable platen assembly, the weights of any two of the movable platen assemblies may be the same or different.
Further, a through hole is formed in the movable pressing plate, a guide shaft sleeve which is beneficial to the movable pressing plate to slide up and down is arranged on the through hole, and the inner diameter of the guide shaft sleeve is matched with the outer diameter of the guide rod.
Further, a first battery is arranged between the base and the first movable pressing plate, an N-1 th battery is arranged between the N-1 th movable pressing plate and the N-th battery, and the first battery and the N-th battery are sequentially connected in series, wherein N is a positive integer, and N is more than or equal to 2 and less than or equal to 10.
Further, the number of the movable pressing plate assemblies is six.
Further, a magnetic column body is fixedly connected to the base, and a magnetic strip is arranged on the side surface, close to the displacement reader, of the magnetic column body.
Further, a holding part is arranged on the movable pressing plate.
In another aspect, the present invention provides a method for testing the expansion of a plurality of batteries under different pressures, the method using the device for testing the expansion of a plurality of batteries under different pressures, the method comprising the steps of:
step S10: clamping each interlayer battery between the base and the first movable pressing plate and between the adjacent two movable pressing plates respectively, wherein the constant pressure born by the battery of each interlayer is equal to the weight combination above the interlayer battery;
step S20: sequentially connecting the interlayer batteries in series;
step S30: circularly charging and discharging the battery;
step S40: during charge and discharge cycles, the displacement reader reads the amount of expansion of the sandwich cell below it.
Further, the sum of the weight of all movable platen assemblies above a certain sandwich cell and the weight of all sandwich cells gives the weight combination of the sandwich cell in the step S10.
As a preferred embodiment, the method for testing the expansion of a plurality of batteries under different pressures uses the device for testing the expansion of a plurality of batteries under different pressures, the method comprises the following steps:
step S100: clamping a first battery between the base and a first movable pressing plate, and sequentially clamping a second battery and a third battery … … Nth battery upwards, wherein the Nth battery is clamped between an N-1 th movable pressing plate and an N movable pressing plate; the constant pressure applied by the first battery is the sum of the weights of the second movable plate component and the N movable plate component plus the sum of the weights of the second battery and the N battery, the constant pressure applied by the second battery and the N battery of the third battery … … is sequentially reduced relative to the first battery, and the constant pressure applied by the N battery is the weight of the N movable plate component;
step S200: sequentially connecting the first battery to the N battery in series to lead out a total positive electrode terminal and a total negative electrode terminal;
step S300: circularly charging and discharging the first battery to the N battery through the total positive electrode terminal and the total negative electrode terminal in the step S200;
step S400: the first battery to the Nth battery expand in the process of charge-discharge circulation, and at the moment, the first displacement reader to the Nth displacement reader which are correspondingly connected with the first movable pressing plate to the Nth movable pressing plate respectively read the first expansion amount to the Nth expansion amount, wherein N is a positive integer, and N is more than or equal to 2 and less than or equal to 10; further, n=6 is preferable.
The invention has the beneficial effects that:
1. the invention is fixed on the base vertically through the guide rod, a plurality of movable pressing plates are arranged along the guide rod in a sliding way up and down, so that the upper and lower parallel relation is formed between each movable pressing plate and the base; moreover, batteries are clamped between the base and the first movable pressing plate and between every two adjacent movable pressing plates, so that the movable pressing plate assemblies and the batteries have the same number and are in laminated arrangement, the constant pressure born by the batteries of each interlayer is the sum of the movable pressing plate assemblies and the weights of the batteries on all the batteries of the interlayer, the pressure born by the batteries on the bottommost base is the largest, the pressure born by the batteries on the top layer is the smallest, and different constant pressures are applied to the batteries of different interlayers; then, the expansion amount of the battery of each interlayer in the charge-discharge circulation process is respectively obtained through a plurality of displacement readers, and the design of the weight combination of the movable pressing plate component is adopted, so that the beneficial effects of simultaneously testing the expansion amounts of a plurality of interlayer batteries under different pressures are realized.
2. According to the invention, through the weight combination of the movable pressing plate assemblies with the same weight and/or different weights, different constant pressures are applied to batteries with different interlayers, the expansion amount of the same batch of batteries under different pressures can be observed at the same time, and then the optimal constant pressure value of the batch of batteries is obtained rapidly, so that the efficiency is high, the operability is strong, and important data is provided for the development design of the batteries and the cycle service life of the batteries.
3. Through the guide shaft sleeve arranged on the movable pressing plate, the inner diameter of the guide shaft sleeve is matched with the outer diameter of the guide rod, so that a plurality of movable pressing plates can slide flexibly up and down, the friction between the movable pressing plates is reduced, and the beneficial effects of capability of simultaneously testing the expansion amounts of a plurality of sandwich batteries, simplicity in operation and high testing precision are further realized.
4. Through the serial connection among the batteries of each interlayer, the unified test current of each battery can be ensured, the expansion test accuracy under different pressures in the cyclic charge and discharge process is further ensured, and only one charge and discharge test device is needed to be connected, so that only one charge and discharge test device channel is occupied for simultaneously testing a plurality of batteries, and the beneficial effects of simple structure, convenience in operation and resource cost saving are further realized.
5. The displacement reader arranged on each movable pressing plate is used for measuring the relative displacement variation of every two adjacent movable pressing plates, so that the thickness variation (namely the expansion of the battery) of the battery in the charge-discharge cycle process is accurately measured, and the displacement reader adopts a magnetic grating ruler, a grating ruler or a laser range finder with higher precision, so that the invention has the beneficial effect of high measurement precision.
6. The holding part arranged on the movable pressing plate is convenient for installing and using the movable pressing plate, and further enhances the beneficial effect of the operation convenience of the invention.
Drawings
The following drawings are included to provide a further understanding of the present application and are intended to provide a further explanation and illustration of the invention, and are not intended to limit the scope of the invention. In the drawings:
FIG. 1 is a schematic diagram of an apparatus for testing the expansion of a plurality of batteries under different pressures according to a first embodiment of the present disclosure;
FIG. 2 is a schematic front view of an apparatus for testing the expansion of a plurality of batteries under different pressures according to a second embodiment of the present application;
fig. 3 is a flow chart of a method for testing the expansion of a plurality of cells under different pressures in accordance with a third embodiment of the present application.
Reference numerals:
10. a base; 11. a bracket holder; 20. a guide rod; 21. a first movable platen; 22. a second movable platen; 23. a third movable platen; 24. a fourth movable platen; 25. a fifth movable platen; 26. a sixth movable platen; 2N, the N movable pressing plate; 2 (N-1), the N-1 th movable pressing plate; 200. a grip portion; 30. a displacement reader; 31. a magnetic stripe column; 40. and (5) conducting wires.
Detailed Description
The following drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate several embodiments of the invention and together with the description serve to explain the principles of the invention.
Unless a direction is defined separately, the directions of up, down, left, right, horizontal, vertical, etc. referred to herein are all based on the directions of up, down, left, right, horizontal, vertical, etc. as shown in fig. 1 of the embodiment of the present application, and if the specific gesture changes, the directional indication changes accordingly. The terms "first," "second," and the like, herein do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Furthermore, in various embodiments of the present disclosure, the same or similar reference numerals denote the same or similar components.
In the present invention, unless explicitly specified and limited otherwise, the terms "coupled," "affixed," and the like are to be construed broadly, and for example, "affixed" may be either a fixed connection, a removable connection, or an integral body, unless explicitly specified otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, the technical solutions of the embodiments of the present invention may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of the claimed invention.
Example 1
Referring to fig. 1 to 2, an apparatus for testing the expansion of a plurality of batteries under different pressures in the present embodiment includes a base 10, a rack holder 11, and a testing space formed between the rack holder 11 and the base 10, wherein the present embodiment includes, but is not limited to, four guide rods 20 vertically fixed on the base; the movable pressing plate assembly comprises a movable pressing plate and a displacement reader 30 arranged on the movable pressing plate, and each movable pressing plate slides up and down along the guide rod 20 to enable each movable pressing plate to be parallel to the base.
By utilizing the technical scheme of the embodiment, batteries are clamped between the base 10 and the first movable pressing plate 21 and between every two adjacent movable pressing plates to form a plurality of interlayer batteries, and the constant pressure born by each interlayer battery is equal to the weight combination above the interlayer battery, so that the pressure born by the battery on the bottommost base is the largest, the pressure born by the battery on the top layer is the smallest, and different constant pressures are applied to the batteries of different interlayers; furthermore, the expansion amount of the battery of each interlayer in the charge-discharge cycle process is respectively obtained through a plurality of displacement readers, the optimal constant pressure value of the battery batch is screened out, the cycle life data of the battery under different constant pressures can be further obtained, and high-efficiency and high-precision test data are provided for the development and design of the battery and the cycle service life of the battery. Therefore, the beneficial effects of simultaneously testing the expansion amounts of the plurality of interlayer batteries under different pressures are realized, and the device has the advantages of high testing efficiency, high precision, low cost, strong practicability, simplicity in operation and the like, and further solves the problems of complex operation, high implementation difficulty, high cost, low testing efficiency and low precision in the prior art.
It should be noted that each of the interlayer cells in this embodiment is preferably, but not limited to, a single cell, and may be a cell module. The lug clamps and the lead wires 40 are used for connecting the plurality of interlayer batteries in series, so that the unified test current of each battery is ensured, the expansion test accuracy under different pressures in the cyclic charge and discharge process is further ensured, and only one charge and discharge test device is needed to be connected, so that only one charge and discharge test device channel is occupied for simultaneously testing the plurality of batteries, and the beneficial effects of simple structure, convenience in operation, resource cost saving and high test accuracy are further realized.
The displacement reader in this embodiment reads the amount of expansion of the sandwich cell beneath it during the charge and discharge cycles, and specifically each displacement reader 30 reads the amount of expansion of the sandwich cell immediately beneath it. Furthermore, the displacement reader 30 mounted on each movable platen is preferably, but not limited to, a magnetic grating scale, or laser rangefinder; referring to fig. 1, the displacement reader 30 slides along the magnetic stripe arranged on the magnetic stripe column 31, reads the relative displacement data, and transmits the data to the corresponding software of the computer, so as to accurately measure the thickness change (i.e. the expansion of the battery) of each sandwich battery in the charge-discharge cycle process, and further ensure that the invention has the advantage of high measurement accuracy.
Example two
The first embodiment is different from the first embodiment in that the weight combination in the first embodiment is specifically described as the sum of the weights of the movable pressing plate components above the interlayer battery plus the sum of the weights of the batteries above the interlayer battery; as shown in fig. 2, the present embodiment includes N movable platen assemblies, which respectively include a first movable platen 21, a second movable platen 22, a third movable platen 23, … …, an N-1 movable platen 2N-1, an N-th movable platen 2N, and displacement readers 30 respectively mounted on the respective movable platens. The weights of the movable pressing plate components in the embodiment are respectively M1, M2 and M3 … … Mn, and the data of the weights can be the same or different and are set according to actual conditions; the weight of each interlayer battery is S, the weight of the batteries in the same batch is generally the same, and the device can be used for batteries with different weights in different batches, so that the advantages of wide application range and strong practicability of the testing device are further reflected; because the interlayer batteries and the movable pressing plate assemblies have the same number and are in laminated arrangement, the pressure F1 born by the first interlayer battery on the bottommost base is the maximum constant pressure value, and F1=M1+M2+M3+M … … +Mn+S (n-1); the pressure F2 applied to the second sandwich cell in sequence is: f2 =m2+m3+m … … +mn+s (n-2); the third sandwich cell is subjected to a pressure F3 of: f3 The pressure Fn experienced by the N-th cell on the top layer of (N-3) … …, m3+m4+ 4 … … +mn+s, is the minimum constant pressure value, fn=mn.
Therefore, according to the embodiment, through the combination of the movable pressing plates, the constant pressure to which the batteries of different interlayers are subjected is different, the series battery pack is subjected to charge-discharge circulation through the charge-discharge test equipment, the change amount condition of the relative displacement between the adjacent movable pressing plates is tested through the displacement reader 30, the expansion amount of each interlayer battery under different constant pressures is obtained, the optimal constant pressure value of the batch of batteries is screened according to the different expansion amounts under different constant pressures, and further the cycle life data of the batteries under different constant pressures can be obtained, so that the test data with high efficiency and high precision are provided for the development, design and cycle life of the batteries.
Example III
In this embodiment, as a preferred embodiment, as shown in fig. 1, the number of the movable platen assemblies is preferably, but not limited to, six, and the movable platen assembly includes a first movable platen 21, a second movable platen 22, a third movable platen 23, a fourth movable platen 24, a fifth movable platen 25, a sixth movable platen 26, and displacement readers 30 respectively mounted on the movable platens. The weight of the first movable pressing plate assembly to the weight of the fifth movable pressing plate assembly in the embodiment are 24kg, the weight of the sixth movable pressing plate is 25kg, and the weight of each interlayer battery is 1kg. F1=150 kg, f2=125 kg, f3=100 kg, f4=75 kg, f5=50 kg, f6=25 kg, the constant pressures to which the first to sixth cells are subjected are respectively: 150kg,125kg,100kg,75kg,50kg,25kg; the positive electrode and the negative electrode of each layer of battery are placed on the movable pressing plate in a crossed manner, the batteries are sequentially connected in series through the lead wire 40, the total positive electrode end and the total negative electrode end led out through the series connection are connected on the charge and discharge test equipment for charge and discharge circulation, the expansion amount of each interlayer battery under the action of constant pressure is measured, the expansion amount of each interlayer battery is tested through the displacement reader 30, the optimal constant pressure value of each batch of batteries is screened out, the cycle life data of the batteries under different constant pressures can be further obtained, and high-efficiency and high-precision test data are provided for the development and design of the batteries and the cycle service life of the batteries.
Example IV
As shown in fig. 3, the present embodiment provides a method for testing the expansion of a plurality of batteries under different pressures, which adopts the device for testing the expansion of a plurality of batteries under different pressures in the first, second and third embodiments, and specifically includes the following steps:
step S10: clamping a plurality of batteries between a base and a first movable pressing plate and between every two adjacent movable pressing plates respectively, wherein the constant pressure born by the batteries of each interlayer is equal to the weight combination above the batteries of the interlayer;
step S20: sequentially connecting a plurality of batteries in series;
step S30: charging and discharging a plurality of batteries;
step S40: and respectively obtaining the expansion amounts of the batteries in the charge and discharge cycle process through the displacement readers.
As a preferred embodiment, the sum of the weights of the movable platen assemblies above the sandwich cell in this example plus the sum of the weights of the cells above the sandwich cell gives the weight combination in step S10.
Specifically, in connection with fig. 2, the first step of this embodiment is as follows: firstly, a first battery is placed on a base 10, and a first movable pressing plate assembly 21 is installed on a guide rod 20 and is in sliding contact with the first battery downwards; next, the second cell is placed on the first movable platen assembly 21, then the second movable platen assembly 22 is pressed onto the second cell, sequentially stacked and arranged, and finally the nth movable platen assembly is pressed onto the nth cell. The weights of the movable pressing plate components in the embodiment are respectively M1, M2 and M3 … … Mn, and the data of the weights can be the same or different and are set according to actual conditions; the weight of each interlayer battery is S, the weight of the batteries in the same batch is generally the same, and the device can be used for batteries with different weights in different batches, so that the advantages of wide application range and strong practicability of the testing device are further reflected; because the interlayer batteries and the movable pressing plate assemblies have the same number and are in laminated arrangement, the pressure F1 born by the first interlayer battery on the bottommost base is the maximum constant pressure value, and F1=M1+M2+M3+M … … +Mn+S (n-1); the pressure F2 applied to the second sandwich cell in sequence is: f2 =m2+m3+m … … +mn+s (n-2); the third sandwich cell is subjected to a pressure F3 of: f3 =m3+m … … +mn+s (n-3); the top nth cell is subjected to a pressure Fn of a minimum constant pressure value, fn=mn.
The second step of this embodiment: the first battery and the second battery … … are sequentially connected in series through the lead 40, and the total positive end and the total negative end of the lead-out can ensure the unification of the test current of each battery, thereby further ensuring the test accuracy of the expansion amount under different pressures in the cyclic charge and discharge process.
The third step of this embodiment: the total positive electrode end and the total negative electrode end led out through the series connection are connected on the charge-discharge test equipment for circulation charge-discharge, only one charge-discharge test equipment needs to be connected, only one charge-discharge test equipment channel is occupied for simultaneously testing a plurality of batteries, and the beneficial effects of simple structure, convenience in operation, resource cost saving and high test precision are further realized.
The fourth step of this embodiment: the displacement reader 30 is used for testing the change amount of the relative displacement between the adjacent movable pressing plates, so as to obtain the expansion amount of each interlayer battery under different constant pressures,
in summary, according to the invention, through the weight combination of each movable pressing plate component, the constant pressure born by each interlayer battery is equal to the weight combination above the interlayer battery, the constant pressures born by different interlayer batteries are different, different expansion values of the batteries are measured under different constant pressures, and then the optimal constant pressure value of the batch of batteries is screened out, so that the cycle life data of the batteries under different constant pressures can be further obtained, and the high-efficiency and high-precision test data are provided for the development and design of the batteries and the cycle life of the batteries. Therefore, the expansion quantity of the plurality of interlayer batteries can be tested at the same time under different constant pressures, and the method has the advantages of high testing efficiency, high precision, low cost, strong practicability, simplicity in operation and the like, and further solves the problems of complex operation, high implementation difficulty, high cost, low testing efficiency and low precision in the prior art.
While the foregoing description illustrates and describes the preferred embodiments of the present application, it is to be understood that this application is not limited to the forms disclosed herein, but is not to be construed as an exclusive use of other embodiments, and is capable of many other combinations, modifications and environments, and is capable of changes within the scope of the inventive subject matter, either as a result of the foregoing teachings or as a result of knowledge or technology in the relevant art. And that modifications and variations which do not depart from the spirit and scope of the present invention are intended to be within the scope of the appended claims.
Claims (10)
1. An apparatus for testing the expansion of a plurality of batteries under different pressures, comprising a base, a bracket holder, a testing space formed between the bracket holder and the base, and the apparatus is characterized in that the apparatus further comprises:
at least two guide rods, wherein the guide rods are vertically fixed on the base;
the movable pressing plate assemblies comprise movable pressing plates and displacement readers arranged on the movable pressing plates, the movable pressing plates slide up and down along the guide rods, and interlayer batteries are clamped between the base and the first movable pressing plate and between two adjacent movable pressing plates;
the displacement reader reads the expansion amount of the interlayer battery below the displacement reader in the charge-discharge cycle process.
2. The apparatus of claim 1 wherein said weight combination above a given one of said cells is the sum of the weight of all of said movable platen assemblies above the given cell and the weight of all of said cells.
3. The apparatus of claim 1, wherein the weight of any two of said movable platen assemblies may be the same or different in said movable platen assemblies.
4. The device for testing the expansion amounts of a plurality of batteries under different pressures according to claim 1, wherein the movable pressing plate is provided with a through hole, a guide shaft sleeve which is beneficial to the movable pressing plate to slide up and down is arranged on the through hole, and the inner diameter of the guide shaft sleeve is matched with the outer diameter of the guide rod.
5. The device for testing the expansion amount of a plurality of batteries under different pressures according to claim 1, wherein a first battery is arranged between the base and the first movable pressing plate, an Nth battery is arranged between the N-1 th movable pressing plate and the Nth movable pressing plate, and the first battery to the Nth battery are sequentially connected in series, wherein N is a positive integer, and N is more than or equal to 2 and less than or equal to 10.
6. The apparatus of claim 5, wherein the number of movable platen assemblies is six.
7. The device for testing the expansion amount of a plurality of batteries under different pressures according to claim 1, wherein a magnetic column is fixedly connected to the base, and a magnetic strip is arranged on the side surface, close to the displacement reader, of the magnetic column.
8. The device for testing the expansion of a plurality of batteries under different pressures according to claim 1, wherein the movable pressing plate is provided with a holding part.
9. A method for testing the expansion of a plurality of cells under different pressures, said method employing the apparatus for testing the expansion of a plurality of cells under different pressures according to any one of claims 1-8, said method comprising the steps of:
step S10: clamping each interlayer battery between the base and the first movable pressing plate and between the adjacent two movable pressing plates respectively, wherein the constant pressure born by the battery of each interlayer is equal to the weight combination above the interlayer battery;
step S20: sequentially connecting the interlayer batteries in series;
step S30: circularly charging and discharging the battery;
step S40: during charge and discharge cycles, the displacement reader reads the amount of expansion of the sandwich cell below it.
10. The method of claim 9, wherein the sum of the weight of all movable platen assemblies above a certain sandwich cell and the weight of all sandwich cells gives the weight combination of the sandwich cells in step S10.
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