CN220231930U - Cell cycle test fixture - Google Patents

Abstract

The application discloses electric core circulation test fixture, electric core circulation test fixture includes clamping device, cooling plate and locating part, and clamping device has along relative first compression face of first direction and second compression face, forms interval adjustable centre gripping space between first compression face and the second compression face, and first compression face and/or second compression face are equipped with the cooling plate, and the inside of the cooling channel of cooling plate is equipped with the locating part, and the size of locating part along the first direction is less than the maximum size of cooling channel along the first direction. The battery cell circulation test fixture provided by the application can provide an integral package state for the battery cell, and has the advantage of high test accuracy of the expansion force of the battery cell.

Description

Cell cycle test fixture

Technical Field

The application relates to the technical field of battery cell production, in particular to a battery cell circulation test fixture.

Background

The primary preconditions for the development and popularization of the current lithium ion battery cell are in two aspects: cell safety and reliability, therefore, the problem of gassing and swelling of cells during the full life cycle is a concern in product development. The expansion force and expansion rate data of the battery cell are important to the safety design of the battery cell, the module and even the battery pack. In the related art, a battery cell circulation test tool is generally adopted to test the expansion force of the battery cell, but the current battery cell circulation test tool cannot simulate the state of the battery cell in the whole package, so that the defect of poor test accuracy of the expansion force of the battery cell exists.

Disclosure of Invention

The present application aims to solve, at least to some extent, one of the technical problems in the related art.

Therefore, the embodiment of the application provides a battery cell circulation test fixture, which can provide an integral package state for a battery cell and has the advantage of high test accuracy of the expansion force of the battery cell.

According to the embodiment of the application, the battery cell circulation test tool comprises a clamping device, a cooling plate and a limiting piece, wherein the clamping device is provided with a first compression surface and a second compression surface, the first compression surface and the second compression surface are oppositely arranged along a first direction, a clamping space is formed between the first compression surface and the second compression surface, and the first compression surface and the second compression surface can be mutually close to or mutually far away from each other; the first compression surface and/or the second compression surface is/are provided with the cooling plate, a limiting piece is arranged in the cooling channel of the cooling plate, and the size of the limiting piece along the first direction is smaller than the largest size of the cooling channel along the first direction.

In some embodiments, the dimension of the stop in the first direction is greater than half of the maximum dimension of the cooling channel in the first direction.

In some embodiments, the cooling channel has first and second faces opposite in the first direction, wherein,

the limiting piece is arranged on the first surface and is spaced from the second surface;

and/or, the limiting piece is arranged on the second surface and is spaced from the first surface.

In some embodiments, the cell cycle test fixture further comprises a displacement sensor disposed on a side of the cooling plate facing the clamping space.

In some embodiments, the displacement sensor comprises a film displacement sensor in abutting contact with the cooling plate, the film displacement sensor comprising a plurality of discretely arranged detection points.

In some embodiments, the clamping device comprises a first clamping plate, a second clamping plate and a fastener, wherein the first clamping plate and the second clamping plate are arranged at intervals along a first direction, the first pressing surface is formed on the first clamping plate, and the second pressing surface is formed on the second clamping plate; the fastener connects the first clamping plate and the second clamping plate.

In some embodiments, the fastener includes a connecting rod extending in the first direction, a first end of the connecting rod being connected to the first cleat, and a stop plate; and the second clamping plate is provided with a matching hole, and the connecting rod passes through the matching hole and is connected with the stop plate.

In some embodiments, the cell cycle test fixture further comprises a force sensor sandwiched between the stop plate and the second clamping plate.

In some embodiments, the connecting rods are at least three, and at least three of the connecting rods are located outside the cooling plate and are arranged at intervals along the circumferential direction of the cooling plate.

In some embodiments, the first clamping plate, the second clamping plate, and the stop plate are all steel plates, each of the first clamping plate, the second clamping plate, and the stop plate having a thickness of 8mm-15mm.

According to the battery cell circulation test tool, the cooling plate and the battery cell to be detected are clamped in the clamping space formed between the first compression surface and the second compression surface through the clamping device, and the battery cell to be detected is kept in contact with the cooling plate in a fitting mode. The limiting piece is arranged in the cooling plate to limit the shrinkage of the cooling channel, and when the battery cell to be detected expands to compress the cooling channel, the expansion deformation of the battery cell to be detected is only a part of the maximum compression of the cooling channel in the prior art, so that the expansion deformation of the battery cell to be detected is more similar to the expansion deformation of the battery cell in the whole package state, and the accuracy of the battery cell circulation test tool test is effectively improved.

Drawings

Fig. 1 is an exploded view of a cell cycle test fixture according to an embodiment of the present application.

Fig. 2 is a schematic diagram of a cell cycle test fixture according to an embodiment of the present application.

Fig. 3 is a cross-sectional view of a cooling plate in a cell cycle test fixture according to an embodiment of the present application.

Reference numerals:

1. a cooling plate; 12. a cooling channel; 121. a first face; 122. a second face; 13. a limiting piece; 2. a force sensor; 3. a thin film displacement sensor; 4. a first clamping plate; 41. a first mounting hole; 5. a second clamping plate; 6. a stop plate; 61. a second mounting hole; 7. a connecting rod; 8. a first screw; 9. a second screw; 10. and (5) detecting the battery cell.

Detailed Description

Embodiments of the present application, examples of which are illustrated in the accompanying drawings, are described in detail below. The embodiments described below by referring to the drawings are exemplary and intended for the purpose of explaining the present application and are not to be construed as limiting the present application.

In the related art, in the whole package state, the battery cells are attached to two sides of the cooling plate, and in the expansion process of the battery cells, the two battery cells expand to simultaneously press the cooling plate between the two battery cells, so as to simultaneously cause deformation and shrinkage of the cooling channel, and at this time, the maximum expansion amount of each battery cell corresponds to about half of the maximum shrinkage amount of the cooling channel. However, the battery core circulation test tool in the related art only carries out circulation test on one battery core, at this time, the cooling plate is only pressed by expansion of one battery core, which is inconsistent with the actual whole package state of the battery core, and when the cooling channel on the cooling plate is extruded in the expansion deformation process of the battery core, the expansion amount of the battery core exceeds half of the maximum contraction amount of the cooling channel, wherein the expansion process continues to occur after the expansion amount of the battery core exceeds half of the maximum contraction amount of the cooling channel, which is inconsistent with the expansion condition of the battery core in the whole package state, and further the defect of poor test accuracy of the expansion force exists.

To solve the above-mentioned drawbacks, a battery cell cycle test fixture according to an embodiment of the present application is provided below with reference to fig. 1 to 3.

The battery cell circulation test tool comprises a clamping device, a cooling plate 1 and a limiting piece. The clamping device is provided with a first clamping surface and a second clamping surface, the first clamping surface and the second clamping surface are oppositely arranged along the first direction, a clamping space is formed between the first clamping surface and the second clamping surface, and the first clamping surface and the second clamping surface can be mutually close to or mutually far away from each other. The clamping space is used for accommodating the to-be-detected battery cell 10, and the first pressing surface and the second pressing surface are close to each other to clamp the to-be-detected battery cell 10 therein.

The first compression surface and/or the second compression surface are/is provided with a cooling plate 1, a limiting piece 13 is arranged in the cooling channel 12 of the cooling plate 1, and the size of the limiting piece 13 along the first direction is smaller than the largest size of the cooling channel 12 along the first direction.

According to the battery cell circulation test tool, the cooling plate 1 and the battery cell 10 to be detected are clamped in the clamping space formed between the first clamping surface and the second clamping surface through the clamping device, and the battery cell 10 to be detected is kept in contact with the cooling plate 1. The limiting piece is arranged in the cooling plate 1 to limit the shrinkage of the cooling channel 12, when the battery cell 10 to be detected expands and compresses the cooling channel 12, the expansion deformation of the battery cell to be detected is only a part of the maximum compression of the cooling channel 12 in the prior art, so that the expansion deformation of the battery cell 10 to be detected is more similar to the expansion deformation of the battery cell in the whole package state, and the accuracy of the battery cell cycle test fixture test is effectively improved.

The first direction is the thickness direction of the cooling plate 1, the cooling passage 12 includes a first region having a dimension in the first direction that is the largest dimension of the cooling passage 12, and a second region having a dimension in the first direction that is smaller than the largest dimension of the cooling passage 12. In the whole package state, when two battery cells simultaneously press the cooling plate 1, the second area is contracted to disappear, and the expansion and deformation are stopped. At this time, the first area does not shrink to disappear, and the communication of the cooling channels 12 can still be ensured, so that the heat dissipation function of the cooling plate 1 is ensured.

In some embodiments, as shown in fig. 3, the dimension of the stop 13 in the first direction is greater than half the largest dimension of the cooling channel 12 in the first direction.

In the related art, when the cooling passage 12 of the cooling plate 1 reaches the maximum compression amount, in order to maintain the communication state of the cooling passage 12, the compression displacement amount thereof is not equal to the maximum size of the cooling passage 12 in the first direction. Therefore, by setting the size of the limiting piece 13 along the first direction to be larger than half of the maximum size of the cooling channel 12 along the first direction, when the battery cell 10 to be detected expands to compress the cooling channel 12, so that the compression amount of the limiting piece 13 is smaller than half of the maximum size of the cooling channel 12 along the first direction when the limiting piece 13 abuts against two opposite sides of the cooling channel 12 along the first direction, the deformation of the battery cell circulation test fixture in the whole package state is more met, and the test accuracy of the battery cell circulation test fixture is further ensured.

Specifically, the limiting member 13 may be a limiting post extending along the first direction, the limiting member 13 may be disposed in the second region of the cooling channel 12, and the size of the limiting member 13 along the first direction is equal to half of the size of the second region along the first direction.

As shown in fig. 3, the cooling passage 12 has a first face 121 and a second face 122 opposite in the first direction, wherein the stopper 13 is provided at the first face 121 and spaced apart from the second face 122. At this time, the space between the limiting member 13 and the second surface 122 is the maximum compression amount of the cooling channel 12, and when the limiting member 13 abuts against the second surface 122, the cell 10 to be detected reaches the maximum expansion amount in the whole package state, and does not continue to expand.

And/or, the limiting member 13 is disposed on the second surface 122 and spaced apart from the first surface 121. When the first surface 121 and the second surface 122 are both provided with the limiting members 13, the limiting members 13 of the first surface 121 may be opposite to and spaced from the limiting members 13 of the second surface 122 along the first direction, and the limiting members 13 of the first surface 121 may be arranged in a staggered manner with respect to the limiting members 13 of the second surface 122 along the first direction.

In some embodiments, as shown in fig. 1 and 2, there are two cooling plates 1, and the two cooling plates 1 are arranged at intervals along the first direction and located between the first compression surface and the second compression surface, and the cell 10 to be detected is clamped between the two cooling plates 1.

Therefore, the battery cell 10 to be detected, of which the two sides are attached with the cooling plates 1, can be tested through the battery cell circulation test tool of the embodiment in the whole package state, and the battery cell 10 to be detected can be ensured to be consistent with the stress deformation in the whole package state, and the test accuracy of the battery cell circulation test tool is high.

In some embodiments, the cell cycle test fixture further comprises a displacement sensor, and the displacement sensor is disposed on a side of the cooling plate 1 facing the clamping space.

The displacement sensor can detect the expansion displacement of the battery cell 10 to be detected in real time, so that the corresponding relation between the expansion force and the expansion amount is obtained, the data of the battery cell cycle test tool for the battery cell cycle test is more and more comprehensive, and the functionality of the battery cell cycle test tool is high.

Specifically, the displacement sensor includes a film displacement sensor 3, the film displacement sensor 3 is in contact with the cooling plate 1, and the film displacement sensor 3 includes a plurality of discretely arranged detection points. Namely, the film displacement sensor 3 can detect the expansion displacement amounts at a plurality of positions of the battery cell 10 to be detected, and further more comprehensively compares the corresponding relation between the expansion force and the expansion amount.

In some embodiments, as shown in fig. 1 and 2, the clamping device includes a first clamping plate 4, a second clamping plate 5, and a fastener. The first clamping plate 4 and the second clamping plate 5 are arranged at intervals along the first direction, the first pressing surface is formed on the first clamping plate 4, and the second pressing surface is formed on the second clamping plate 5. The fastener connects the first clamping plate 4 and the second clamping plate 5.

At this time, the distance between the first clamping plate 4 and the second clamping plate 5 is adjustable, so that the electric cores with different sizes are compressed, the fastening piece is used for connecting the first clamping plate 4 and the second clamping plate 5, and the electric core 10 to be detected and the two cooling plates 1 are stably attached.

Specifically, the first direction may be an up-down direction, the first clamping plate 4 is located below the second clamping plate 5, the areas of the first compression surface and the second compression surface are larger than the area of the cooling plate 1, that is, the first clamping plate 4 and the second clamping plate 5 fully cover the side surface of the cooling plate 1, and the detection accuracy of the expansion force of the to-be-detected battery cell 10 is further ensured under the same stress condition of the cooling plate 1 in the whole package state of the battery module.

In some embodiments, as shown in fig. 1 and 2, the fastener includes a connecting rod 7 and a stop plate 6, the connecting rod 7 extending in a first direction, a first end of the connecting rod 7 being connected to the first clamping plate 4. The second clamping plate 5 is provided with a matching hole, and the connecting rod 7 passes through the matching hole and is connected with the stop plate 6.

I.e. the second clamping plate 5 is slidable in a first direction under the guidance of the connecting rod 7, the stop plate 6 presses the second clamping plate 5 towards the first clamping plate 4 to ensure that the cell 10 to be tested and the two hydraulic plates are compressed between the first clamping plate 4 and the second clamping plate 5.

In some embodiments, as shown in fig. 1 and 2, the cell cycle test fixture further includes a force sensor 2, where the force sensor 2 is sandwiched between a stop plate 6 and a second clamping plate 5.

When the cell 10 to be detected is subjected to expansion deformation, the expansion force can be transmitted to the force sensor 2 through the cooling plate 1 and the second clamping plate 5, so that the force sensor 2 can detect the expansion force of the cell 10 to be detected. Meanwhile, the force sensor 2 is clamped between the stop plate 6 and the second clamping plate 5, so that the force sensor 2 is simple and reliable to install.

Specifically, the force sensor 2 has one and generally corresponds to the center position of the cooling plate 1. The base of the force sensor 2 may be connected to the side of the stop plate 6 facing the second clamping plate 5, and the detection end of the force sensor 2 may abut against the side of the second clamping plate 5 facing the stop plate 6.

In some embodiments, as shown in fig. 1 and 2, the cell cycle test fixture further includes a first bolt and a second bolt. The both end faces of connecting rod 7 are equipped with first screw hole and second screw hole respectively, are equipped with first mounting hole 41 on the first splint 4, are equipped with second mounting hole 61 on the backstop board 6, and first bolt passes first mounting hole 41 and with first screw hole screw-thread fit, second bolt passes second mounting hole 61 and with second screw hole screw-thread fit. Therefore, the battery cell circulation testing tool is convenient to assemble and disassemble, and the compression reliability of the battery cell 10 to be detected is high.

Specifically, the first screw 8 and the second screw 9 are bolts, after the battery cell circulation test fixture realizes the clamping of the battery cell 10 to be detected, the connecting rod 7 is abutted with the first clamping plate 4 and is arranged at intervals with the stop plate 6, the gap between the connecting rod 7 and the stop plate 6, namely the adjustment allowance of the stop plate 6, can realize the adjustment of the pressing force of the battery cell 10 to be detected through the cooperation of the second screw 9 and the second screw hole,

in some embodiments, there are at least three connecting rods 7, and at least three connecting rods 7 are located outside the cooling plate 1 and are arranged at intervals along the circumferential direction of the cooling plate 1.

From this, guarantee that first splint 4 and second splint 5 treat the compression reliability of detecting electric core 10 higher, electric core circulation test fixture satisfies the whole package state of treating detecting electric core 10 better.

Specifically, as shown in fig. 1 and 2, the connecting rods 7 are four and distributed at four corners of the first clamping plate 4.

In some embodiments, the first clamping plate 4, the second clamping plate 5 and the stop plate 6 are all steel plates, and each of the first clamping plate 4, the second clamping plate 5 and the stop plate 6 has a thickness of 8mm-15mm.

From this, guarantee that first splint 4, second splint 5 and backstop board 6 have sufficient intensity and rigidity, guarantee that the three can not warp when bearing the expansion force of waiting to detect electric core 10, effectively guarantee the degree of accuracy of the expansion force and the expansion displacement volume of waiting to detect electric core 10 that electric core circulation test fixture detected, also effectively improve electric core circulation test fixture's life.

Specifically, the first clamping plate 4, the second clamping plate 5 and the stop plate 6 may be the same size and shape, and the thickness may be 8mm, 10mm and 15mm.

In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc. indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a 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 at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.

In this application, unless specifically stated 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; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

The terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., in this application, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While the above embodiments have been shown and described, it should be understood that the above embodiments are illustrative and not to be construed as limiting the present application, and that variations, modifications, alternatives, and variations of the above embodiments will be within the scope of the present application by those of ordinary skill in the art.

Claims (10)

1. The utility model provides a electricity core circulation test fixture which characterized in that includes:

the clamping device is provided with a first compression surface and a second compression surface, the first compression surface and the second compression surface are oppositely arranged along a first direction, a clamping space is formed between the first compression surface and the second compression surface, and the first compression surface and the second compression surface can be mutually close to or mutually far away from each other;

the cooling plate, first compression face and/or second compression face are equipped with the cooling plate, the inside of cooling channel of cooling plate is equipped with the locating part, the locating part along the size of first direction is less than the cooling channel is along the maximum size of first direction.

2. The cell cycle test fixture of claim 1, wherein a dimension of the limiting member along the first direction is greater than half of a largest dimension of the cooling channel along the first direction.

3. The tool of claim 1, wherein the cooling channel has a first face and a second face opposite in the first direction, wherein,

the limiting piece is arranged on the first surface and is spaced from the second surface;

and/or, the limiting piece is arranged on the second surface and is spaced from the first surface.

4. The cell cycle test fixture of claim 1, further comprising a displacement sensor disposed on a side of the cooling plate facing the clamping space.

5. The die cycling test fixture according to claim 4, wherein said displacement sensor comprises a film displacement sensor in abutting contact with said cooling plate, said film displacement sensor comprising a plurality of discrete arranged detection points.

6. The cell cycle test fixture of claim 1, wherein the clamping device comprises:

the first clamping plate and the second clamping plate are arranged at intervals along a first direction, the first pressing surface is formed on the first clamping plate, and the second pressing surface is formed on the second clamping plate; and

and the fastener is used for connecting the first clamping plate and the second clamping plate.

7. The cell cycle test fixture of claim 6, wherein the fastener comprises:

the connecting rod extends along the first direction, and the first end of the connecting rod is connected with the first clamping plate; and

the stop plate is provided with a matching hole, and the connecting rod penetrates through the matching hole and is connected with the stop plate.

8. The cell cycle test fixture of claim 7, further comprising a force sensor sandwiched between the stop plate and the second clamp plate.

9. The electrical core circulation test fixture of claim 7, wherein at least three of said connecting rods are located outside of said cooling plate and are arranged at intervals along the circumference of said cooling plate.

10. The cell cycle test fixture of claim 7, wherein the first clamping plate, the second clamping plate, and the stop plate are steel plates, and each of the first clamping plate, the second clamping plate, and the stop plate has a thickness of 8mm-15mm.