Test fixture for single battery

Abstract

The utility model discloses a test fixture for a single battery, which comprises a first cover plate and a second cover plate, a test space is defined between the first cover plate and the second cover plate, and the single battery is suitable for being positioned in the test space; the test piece is at least arranged on the surface of one side, facing the test space, of one of the first cover plate and the second cover plate, the test piece is in contact with the single battery, and the test piece is used for absorbing the deformation quantity of the single battery. According to the test fixture of the single battery, the test piece is arranged on the surface of one side, facing the test space, of one of the first cover plate and the second cover plate, so that expansion force of the single battery can be effectively consistent, relatively moderate expansion force is generated, the situation that the expansion force is too large or too small is avoided, and the test efficiency is improved. And the battery monomers are enabled to circulate in a better state, so that the test precision and the service life test reliability are more accurately improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery manufacturing technical field especially is related to a test fixture of battery monomer. BACKGROUND

[0002] The related art points out that with the rapid rise of new energy industry, the energy storage system has been widely applied, as the core component of the energy storage system - battery, its performance such as life, safety, low temperature, rate and other characteristics have been concerned by the industry. For long-period performance test of battery life, a lot of time and money are needed to obtain the actual performance of the battery. Some electrochemical simulation technologies based on mechanism model, semi-empirical model and data-driven model, although can predict the performance of the battery to some extent, but the reliability of the actual simulation result cannot meet the application of the battery on the whole vehicle, and the direct test means is still needed to complete the evaluation of the battery performance.

[0003] In order to ensure the accuracy of the battery test result, the gap or no gap test scheme is adopted between the tooling fixture and the battery, and the two schemes have obvious influence on the life of the battery. Gap scheme: the battery can expand freely, the deficiency of this way is that: the battery is unconstrained in the initial state, the battery is easy to react insufficiently, and there is a risk of gas production, which reduces the service life of the battery. No gap scheme: the surface of the battery is close to the test fixture, and the fixture directly resists the expansion force, the deficiency of this way is that: the expansion force of the battery surface is non-uniform, so the stress of the pole core is uneven, which affects the performance of the battery, and with the increase of the life, the expansion force will be more and more large, thereby reducing the service life of the battery. UTILITY MODEL CONTENTS

[0004] The utility model aims at solving one of the technical problems in the prior art. Therefore, the utility model provides a test fixture of battery monomer, which can improve the test precision and life test reliability of the battery monomer.

[0005] According to the test fixture of battery monomer of the utility model, it comprises: a first cover plate and a second cover plate, a test space is defined between the first cover plate and the second cover plate, and the battery monomer is adapted to be located in the test space;Test piece, the test piece is at least arranged on the side surface of one of the first cover plate and the second cover plate towards the test space, and the test piece is in contact with the battery monomer, and the test piece is used for absorbing the deformation amount of the battery monomer.

[0006] The utility model discloses a test fixture of battery monomer, through setting test piece on the one side surface of first cover plate and second cover plate towards test space, can effectively consistent battery monomer's expansion force, produces relatively moderate expansion force, avoided the expansion force too big or too small condition, guarantee battery monomer is in the more optimal state and carries out circulation to more accurate improvement test precision and life test credibility.

[0007] In some embodiments, the test piece comprises: a first plate body; a second plate body, the first plate body and the second plate body are connected, and an installation space is arranged between the first plate body and the second plate body; and a first elastic member, the first elastic member is located in the installation space, and the first elastic member is supported between the first plate body and the second plate body.

[0008] In some embodiments, the first elastic member comprises a plurality of elastic units spaced apart in a first direction and a connecting plate connected between adjacent two elastic units, and the elastic units abut against the first plate body and / or the second plate body.

[0009] In some embodiments, the elastic unit comprises a honeycomb-shaped elastic unit, and the elastic unit has a cavity extending in a second direction, and the second direction is perpendicular to the first direction.

[0010] In some embodiments, the test piece further comprises a second elastic member, the second elastic member is located in the installation space, and is spaced apart from the first elastic member in the first direction.

[0011] In some embodiments, the test piece further comprises a first end plate and a second end plate connected at two ends of the first plate body in the first direction, and a third end plate and a fourth end plate connected at two ends of the second plate body in the first direction, wherein the second elastic member has a mounting portion, the mounting portion is clamped between the first end plate and the third end plate, or the mounting portion is clamped between the second end plate and the fourth end plate.

[0012] In some embodiments, the second elastic member comprises an arc-shaped plate and the mounting portion connected at one end of the arc-shaped plate, the other end of the arc-shaped plate is a free end, a limiting plate is arranged in the installation space, the limiting plate is spaced apart from the free end and the first elastic member, the limiting plate limits the deformation amount of the arc-shaped plate by limiting the activity range of the free end, and the limiting plate is located on the first plate body or the second plate body.

[0013] In some embodiments, the mounting portion comprises a first folded plate and a second folded plate and a third folded plate connected at two ends of the first folded plate in a first direction, the second folded plate and the third folded plate are arranged in parallel to form a limiting groove between the first folded plate, the second folded plate and the third folded plate, wherein the first end plate is inserted into the limiting groove, or the fourth end plate is inserted into the limiting groove.

[0014] In some embodiments, the first end plate is inserted into the limiting groove, the arc-shaped plate is protruded towards the second plate body and is spaced apart from the second plate body in a third direction; or, the fourth end plate is inserted into the limiting groove, the arc-shaped plate is protruded towards the first plate body and is spaced apart from the first plate body in a third direction.

[0015] In some embodiments, at least one of the first cover plate and the second cover plate is formed with a limiting rib extending in a second direction, the limiting ribs are arranged in pairs in a first direction, and the test piece is adapted to be arranged between the limiting ribs.

[0016] In some embodiments, the first cover plate and the second cover plate are both formed with a connecting hole, the first cover plate and the second cover plate are connected by a fastener penetrating through the connecting hole, and a sink is formed around the side of the connecting hole away from the test space.

[0017] In some embodiments, the test fixture further comprises: a movable plate arranged between the test piece and at least one of the first cover plate and the second cover plate and defining an accommodation space; and a pressure sensor arranged in the accommodation space.

[0018] Additional aspects and advantages of the present application will be given in part in the following description, become apparent from the following description, or be learned from the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a schematic view of a test fixture according to an embodiment of the present application;

[0020] Figure 2 is Figure 1 is an exploded schematic view of the test fixture shown in FIG. 1;

[0021] Figure 3 is Figure 1 is a schematic view of the side view fixture from another angle shown in FIG. 2;

[0022] Figure 4 is Figure 2 is a schematic view of a test piece shown in FIG. 3;

[0023] Figure 5 is a partial enlarged schematic view of the test piece shown in Figure 4

[0024] Figure 6 is another partial enlarged schematic view of the test piece shown in Figure 4

[0025] Figure 7 is an assembly schematic view of the first plate body, the second plate body and the first elastic piece shown in Figure 4

[0026] Figure 8 is a schematic view of the first elastic piece shown in Figure 7

[0027] Figure 9 is a schematic view of the second elastic piece shown in Figure 4

[0028] Figure 10 is a schematic view of the second plate body shown in Figure 4

[0029] Figure 11 is a schematic view of the second cover plate shown in Figure 2

[0030] Figure 12 is a schematic view of the test fixture of another embodiment of the utility model;

[0031] Figure 13 Figure 12 is an exploded schematic view of the test fixture shown in

[0032] Figure 14 Figure 12 is a schematic view of the test fixture from another angle shown in

[0033] Reference signs:

[0034] 100, test fixture;

[0035] 10, test piece;

[0036] 11, first plate body; 12, first end plate; 13, second end plate;

[0037] 21, second plate body; 22, third end plate; 23, fourth end plate;

[0038] 3, mounting space; 31, limiting plate;

[0039] 4, first elastic piece; 41, elastic unit; 411, cavity; 412, side plate; 42, connecting plate;

[0040] ​​​​​​​​​5, second elastic member; 51, arc-shaped plate; 511, free end; 52, mounting portion; 521, first folded plate; 522, second folded plate; 523, third folded plate; 524, fourth folded plate; 525, limiting groove;

[0041] 20, first cover plate; 30, second cover plate; 301, limiting rib; 302, connecting hole;

[0042] 40, test space; 50, fastener; 501, bolt; 502, stud;

[0043] 60, movable plate; 70, pressure sensor; 80, containing space;

[0044] 200, battery cell. DETAILED DESCRIPTION

[0045] The embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application.

[0046] Reference is made below Figures 1-11 to describe a test fixture 100 of a battery cell 200 according to an embodiment of the present application.

[0047] As Figures 1-3 shown, the test fixture 100 of the battery cell 200 according to an embodiment of the present application comprises a test member 10, a first cover plate 20 and a second cover plate 30.

[0048] Specifically, the first cover plate 20 and the second cover plate 30 define a test space 40 therebetween, the battery cell 200 is adapted to be located in the test space 40, and the test member 10 is arranged on at least one side surface of one of the first cover plate 20 and the second cover plate 30 facing the test space 40 and in contact with the battery cell 200, and the test member 10 is used to absorb the deformation amount of the battery cell 200. It can be understood that the first cover plate 20 and the second cover plate 30 constitute the main frame of the test fixture 100, and the test space 40 defined between the first cover plate 20 and the second cover plate 30 is used to place the battery to be tested, the size of the test space 40 can be changed, and the first cover plate 20 and the second cover plate 30 are usually made of materials with certain strength and stability to ensure that sufficient support can be provided without deformation during the test process, and the test member 10 is located between the battery cell 200 and the cover plate to absorb the expansion amount generated by the battery cell 200 during charging and discharging, thereby maintaining appropriate compression force without causing damage to the battery cell 200.

[0049] For exampleFigure 1 As shown in the drawings, one side surface of the first cover plate 20 facing the test space 40 is provided with a test piece 10, and one side surface of the second cover plate 30 facing the test space 40 is provided with a test piece 10, and the battery monomer 200 is located between the two test pieces 10.

[0050] The conventional tool cover plate directly contacts the battery monomer 200, and the expansion force of the battery monomer 200 is large. The test clamp 100 of the battery monomer 200 according to the embodiment of the utility model, by setting the test piece 10 on one side surface of one of the first cover plate 20 and the second cover plate 30 facing the test space 40, can effectively inhibit the expansion force of the battery monomer 200, produce a relatively moderate expansion force, avoid the case that the expansion force is too large or too small, and ensure that the battery monomer 200 is in a relatively optimal state for circulation, thereby more accurately improving the test precision and the life test reliability.

[0051] It should be noted here that the battery monomer 200 includes but is not limited to one of new battery systems such as lithium ion batteries, sodium ion batteries, and potassium ion batteries; and includes but is not limited to one of traditional liquid batteries, semi-solid batteries, and solid-state batteries; and includes but is not limited to one of square shell battery cells and soft package battery cells.

[0052] In some embodiments of the utility model, as shown in the drawings, Figure 4 As shown in the drawings, the test piece 10 includes a first plate body 11, a second plate body 21, and a first elastic member 4, the first plate body 11 and the second plate body 21 are connected, an installation space 3 is arranged between the first plate body 11 and the second plate body 21, the first elastic member 4 is located in the installation space 3, and the first elastic member 4 is supported between the first plate body 11 and the second plate body 21. It can be understood that during the charging and discharging process of the battery monomer 200, the battery monomer 200 will gradually expand, and appropriate expansion force is beneficial to the chemical reaction inside the battery monomer 200 and the release of performance, but excessive expansion force will cause local aging, heating or lithium precipitation of the battery, and thus the life of the battery monomer 200 will be attenuated. The first elastic member 4 is arranged in the installation space 3, and during the charging and discharging process of the battery monomer 200, the battery monomer 200 expands in the direction of the test piece 10, and the first elastic member 4 contracts, which can facilitate the expansion of the battery monomer 200; and after the battery monomer 200 expands to a certain extent, the contraction of the first elastic member 4 reaches a critical point, the first elastic member 4 no longer continues to contract, that is, the first elastic member 4 can support the first plate body 11 and the second plate body 21, and thus the test piece 10 is supported on one side of the battery monomer 200, avoiding the continuous expansion of the battery monomer 200, so as to improve the test accuracy of the battery monomer 200.

[0053] Here, the side of the test piece 10 in contact with the battery monomer 200 is a deformable side, preferably made of aluminum or copper, and the thickness should not be too thick, and the side away from the battery monomer 200 is preferably made of steel.

[0054] According to some embodiments of this utility model, refer to Figures 4-8 The first elastic element 4 includes a plurality of elastic units 41, which are arranged along a first direction (e.g., refer to the attached diagram). Figure 4 The elastic elements 4 are spaced apart in the e1 direction, and a connecting plate 42 is provided between two adjacent elastic elements 41 for connecting the two adjacent elastic elements 41. When the elastic element 41 contracts, the elastic element 41 can expand in the direction of the connecting plate 42 to provide space for the elastic element 41 to contract. In this way, the elastic force of the first elastic element 4 can be adjusted by adjusting the number of elastic elements 41 and connecting plates 42 to match the different expansion forces when different battery cells 200 expand.

[0055] The elastic unit 41 abuts against the first plate 11, or the elastic unit 41 abuts against the second plate 21, or the elastic unit 41 abuts against both the first plate 11 and the second plate 21, for fixing the elastic unit 41 to the first plate 11 or the second plate 21 or the first plate 11 and the second plate 21.

[0056] When the elastic unit 41 abuts against the first plate 11 and is spaced apart from the second plate 21, the space between the elastic unit 41 and the second plate 21 can provide expansion space for the expansion of the battery cell 200; when the elastic unit 41 abuts against the second plate 21 and is spaced apart from the first plate 11, the space between the elastic unit 41 and the first plate 11 can provide expansion space for the expansion of the battery cell 200; when the elastic unit 41 abuts against both the first plate 11 and the second plate 21, the elastic unit 41 can undergo elastic deformation to provide expansion space for the expansion of the battery cell 200.

[0057] According to some embodiments of this utility model, refer to Figure 4 , Figure 7 and Figure 8 As shown, the elastic unit 41 includes a honeycomb-shaped elastic unit 41, and the elastic unit 41 has a cavity 411. The cavity 411 is along the second direction (e.g., refer to the attached diagram). Figure 4 The cavity 411 extends in the e2 direction and can provide compression space for the contraction of the elastic unit 41. The second direction is perpendicular to the first direction.

[0058] The honeycomb elastic unit 41 includes six side plates 412 connected in sequence. The honeycomb elastic unit 41 is constructed as an equilateral hexagon, so that the honeycomb elastic unit 41 has a symmetrical structure and uniform force.

[0059] According to some embodiments of this utility model, refer to Figures 4-7 , Figure 9As shown, the test piece 10 further comprises a second elastic member 5, which is located in the installation space 3 and is spaced apart from the first elastic member 4 along the first direction, and the second elastic member 5 can also support the first plate body 11 and the second plate body 21, and under the cooperation of the first elastic member 4 and the second elastic member 5, the first plate body 11 and the second plate body 21 can be better supported, and then the battery monomer 200 on at least one side can be better supported, avoiding excessive expansion of the battery monomer 200.

[0060] Here, the first elastic member 4 and the second elastic member 5 can both be elastically deformed, and the material is preferably aluminum or steel.

[0061] According to some embodiments of the utility model, referring to Figures 4-6 As shown, the test piece 10 further comprises a first end plate 12 and a second end plate 13, which are connected at both ends of the first plate body 11 in the first direction; the test piece 10 further comprises a third end plate 22 and a fourth end plate 23, which are connected at both ends of the second plate body 21 in the first direction, and the first end plate 12 can be connected to the third end plate 22, and the second end plate 13 can be connected to the fourth end plate 23, so as to seal the installation space 3.

[0062] The first end plate 12 is located on the side of the third end plate 22 close to the installation space 3, and the fourth end plate 23 is located on the side of the second end plate 13 close to the installation space 3. Among them, the second elastic member 5 has a mounting portion 52, and the mounting portion 52 is clamped between the first end plate 12 and the third end plate 22, or the mounting portion 52 is clamped between the second end plate 13 and the fourth end plate 23, thereby providing a mounting position for the second elastic member 5. The second elastic member 5 can have two, one mounting portion 52 of the second elastic member 5 is clamped between the first end plate 12 and the third end plate 22, and the other mounting portion 52 of the second elastic member 5 is clamped between the second end plate 13 and the fourth end plate 23, and the first elastic member 4 is located between the two second elastic members 5, that is, the second elastic member 5 is located at the edge of the installation space 3, and the first elastic member 4 is located in the middle of the installation space 3.

[0063] According to some embodiments of the utility model, referring to Figure 9 As shown, the second elastic member 5 comprises an arc-shaped plate 51 and a mounting portion 52, the arc-shaped plate 51 is connected to one end of the mounting portion 52, and the other end of the arc-shaped plate 51 is a free end 511, a limiting plate 31 is arranged in the installation space 3, and the limiting plate 31 is spaced apart from the free end 511 and the first elastic member 4, the limiting plate 31 limits the deformation amount of the arc-shaped plate 51 by limiting the movement range of the free end 511, the limiting plate 31 also limits the deformation amount of the first elastic member 4 by limiting the movement range of the first elastic member 4, and then limits the deformation amount of the first plate body 11 and the second plate body 21.

[0064] One free end 511 of the second elastic member 5 is in abutment with the first plate body 11, and the other free end 511 of the second elastic member 5 is in abutment with the second plate body 21, and when the second elastic member 5 is elastically deformed, the free end 511 can move along the first plate body 11 and the second plate body 21, and can guide the compression deformation direction of the second elastic member 5.

[0065] When the free end 511 is deformed to the limiting plate 31, the first elastic member 4 is deformed to the limiting plate 31, and the arc-shaped plate 51 and the first elastic member 4 are no longer elastically deformed, that is, the first plate body 11 and the second plate body 21 are no longer deformed in the direction of approaching each other, and overexpansion of the battery monomer 200 can be avoided.

[0066] Wherein, the mounting portion 52 is located between the first end plate 12 and the third end plate 22, the limiting plate 31 is located on the first plate body 11, the mounting portion 52 is located between the second end plate 13 and the fourth end plate 23, and the limiting plate 31 is located on the second plate body 21, facilitating the installation and fixation of the limiting plate 31.

[0067] According to some embodiments of the present application, referring to Figures 4-6 , Figure 9 , the mounting portion 52 includes a first folded plate 521, a second folded plate 522 and a third folded plate 523, the second folded plate 522 and the third folded plate 523 are connected at both ends of the first direction of the first folded plate 521, and the second folded plate 522 and the third folded plate 523 are arranged in parallel to form a limiting groove 525 between the first folded plate 521, the second folded plate 522 and the third folded plate 523.

[0068] Wherein, the first end plate 12 is inserted into the limiting groove 525, or the fourth end plate 23 is inserted into the limiting groove 525, for installation and fixation of the mounting portion 52.

[0069] According to some embodiments of the present application, referring to Figures 4-6 , Figure 9 , the first end plate 12 is inserted into the limiting groove 525, the arc-shaped plate 51 protrudes towards the second plate body 21, and the arc-shaped plate 51 is spaced apart from the second plate body 21 in the third direction (for example, referring to the direction e3 in the accompanying Figure 4 , provides a compression space for the compression of the first plate body 11 and the second plate body 21, that is, provides an expansion space for the expansion of the battery monomer 200.

[0070] Or, the fourth end plate 23 is inserted into the limiting groove 525, the arc-shaped plate 51 protrudes towards the first plate body 11, and is spaced apart from the first plate body 11 in the third direction, providing a compression space for the compression of the first plate body 11 and the second plate body 21, that is, providing an expansion space for the expansion of the battery monomer 200.

[0071] According to some embodiments of the utility model, refer to Figures 4-6 、 Figure 9 As shown, the first end plate 12 is inserted into the limiting groove 525, the two sides of the second folding plate 522 along the first direction respectively abut against the third end plate 22 and the first end plate 12, and the mounting part 52 is used for sealing the gap between the first end plate 12 and the third end plate 22, facilitating the installation and fixation of the second elastic member 5.

[0072] Alternatively, the fourth end plate 23 is inserted into the limiting groove 525, the two sides of the second folding plate 522 along the first direction respectively abut against the fourth end plate 23 and the second end plate 13, and the mounting part 52 is used for sealing the gap between the second end plate 13 and the fourth end plate 23, facilitating the installation and fixation of the second elastic member 5.

[0073] The two second elastic members 5 are centrally symmetric along the second direction of the mounting space 3.

[0074] According to some embodiments of the utility model, refer to Figures 4-6 、 Figure 9 As shown, the mounting part 52 further comprises a fourth folding plate 524, the fourth folding plate 524 is connected between the third folding plate 523 and the arc-shaped plate 51, the first end plate 12 is inserted into the limiting groove 525, the fourth folding plate 524 abuts against the first plate body 11, and is used for increasing the contact area of the second elastic member 5 and the first plate body 11, facilitating the elastic deformation of the arc-shaped plate 51.

[0075] Alternatively, the fourth end plate 23 is inserted into the limiting groove 525, the fourth folding plate 524 abuts against the second plate body 21, and is used for increasing the contact area of the second elastic member 5 and the second plate body 21, facilitating the elastic deformation of the arc-shaped plate 51.

[0076] According to some embodiments of the utility model, refer to Figures 4-6 、 Figure 9 As shown, the first end plate 12 is inserted into the limiting groove 525, the minimum distance between the arc-shaped plate 51 and the second plate body 21 in the third direction is H, and the distance between the first folding plate 521 and the second plate body 21 in the third direction is h; or the fourth end plate 23 is inserted into the limiting groove 525, the minimum distance between the arc-shaped plate 51 and the first plate body 11 in the third direction is H, and the distance between the first folding plate 521 and the first plate body 11 in the third direction is h.

[0077] The first folded plate 521 of one second elastic member 5 has a spacing with the first plate body 11, the first folded plate 521 of another second elastic member 5 also has a spacing with the second plate body 21, and the spacings are equal, when the test piece 10 is installed to at least one side of the battery monomer 200, the first plate body 11 and the second plate body 21 of the test piece 10 are close to each other in the direction of approaching, when the compression amount reaches h, the first plate body 11 and the second plate body 21 no longer move in the direction of approaching each other, thereby improving the test accuracy of the battery monomer 200.

[0078] The relationship between H and h satisfies: 0 < h ≤ H, after the battery pack is assembled, the compression amount between the first plate body 11 and the second plate body 21 reaches h, and the arc-shaped plate 51 and the first plate body 11 or the second plate body 21 still have an interval space of H-h≥0. For example, H can be 1.5mm.

[0079] In some embodiments of the utility model, at least one of the first cover plate 20 and the second cover plate 30 is formed with a limiting rib 301 extending in the second direction, the limiting rib 301 is arranged in pairs in the first direction, and the test piece 10 is adapted to be arranged between the limiting rib 301. Figures 1-3 、 Figure 11 As shown in the figure, the limiting rib 301 is formed on the first cover plate 20 and the second cover plate 30 to limit the position of the test piece 10, so that the position of the test piece 10 is prevented from moving. Thus, reliable test data of the battery monomer 200 can be obtained, and the test accuracy of the battery monomer 200 is ensured.

[0080] In some embodiments of the utility model, as shown in the figures, Figures 1-3 and Figure 11 The first cover plate 20 and the second cover plate 30 are connected through the fastener 50 penetrating the connecting hole 302, the assembly difficulty of the test fixture 100 is low, the assembly efficiency of the test fixture 100 is improved, and the test fixture 100 is convenient to adjust to adapt to the test of battery monomers 200 of different sizes. The side of the connecting hole 302 away from the test space 40 is formed with a sink, which reduces the overall height of the test fixture 100.

[0081] Here, the fastener 50 includes a bolt 501 and a stud 502, the stud 502 is sleeved in the connecting hole 302, a threaded hole is formed in the stud 502, and the bolt 501 is arranged in the threaded hole and is screwed with the bolt 501.

[0082] In another embodiment of the utility model, refer to Figures 12-14As shown, the test fixture 100 also includes a movable plate 60 and a pressure sensor 70. The movable plate 60 is disposed between the test piece 10 and at least one of the first cover plate 20 and the second cover plate 30, and defines a receiving space 80. The pressure sensor 70 is disposed within the receiving space 80 and connected to the cover plate by a fastener 50. It is understood that the movable plate 60, disposed between the test piece 10 and the cover plate, can move along the axis of the stud 502. When the battery cell 200 expands, the test piece 10 deforms and pushes the movable plate 60 toward the pressure sensor 70, thereby better testing the battery cell 200 and improving the testing accuracy and precision.

[0083] Furthermore, a limiting rib 301 is also formed on the side surface of the movable plate 60 facing the test piece 10 to fix the test piece 10 and prevent the test piece 10 from being displaced.

[0084] The following will refer to Figures 1-14 The assembly process of the test fixture 100 for the battery cell 200 according to two specific embodiments of the present invention is described.

[0085] Example 1,

[0086] Reference Figures 1-3 As shown, a test piece 10 is provided on the surface of the first cover plate 20 facing the test space 40, and a test piece 10 is provided on the surface of the second cover plate 30 facing the test space 40. The test pieces 10 are both located between the limiting ribs 301. The first cover plate 20 and the adjacent test piece 10 are arranged with their centers aligned. The second cover plate 30 and the adjacent test piece 10 are arranged with their centers aligned. The battery cell 200 to be tested is placed between the two test pieces 10 and arranged with their centers aligned. It is fixed by fasteners 50. The fasteners 50 can be freely adjusted with a specified torque to ensure that the battery cell 200 is in contact with the test piece 10 and to ensure the initial preload of the battery cell 200 to be tested in the middle.

[0087] Example 2,

[0088] Reference Figures 12-14As shown, the second cover plate 30 is provided with a test piece 10 on one side surface facing the test space 40, and the movable plate 60 is provided with a test piece 10 on one side surface facing the test space 40, and the test piece 10 is located between the limiting ribs 301, the second cover plate 30 is arranged in the center alignment with an adjacent test piece 10, the movable plate 60 is arranged in the center alignment with an adjacent test piece 10, the battery monomer 200 to be tested is arranged between two test pieces 10 and is arranged in the center alignment, the pressure sensor 70 is arranged between the first cover plate 20 and the movable plate 60, the center of the pressure sensor 70 is arranged in alignment with the center of the first cover plate 20 and the center of the movable plate 60, and is fixed through the fastener 50, the fastener 50 can be installed and adjusted freely with a specified torque, the contact between the battery monomer 200 and the test piece 10 is ensured, and the initial pre-tightening force of the middle battery monomer 200 to be tested is ensured.

[0089] In the description of the present application, it should be understood that the orientations or positional relationships indicated by 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" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0090] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0091] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected, or it can be communicated; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0092] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. Furthermore, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples, without mutual contradiction.

[0093] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A test fixture for a battery cell, characterized by, The test piece is arranged on at least one side surface of one of the first cover plate and the second cover plate facing the test space, and is in contact with the battery cell, and is used to absorb the deformation amount of the battery cell. The test piece comprises: A first plate body; 2. The test fixture of claim 1, wherein, A second plate body connected with the first plate body, and an installation space being arranged between the first plate body and the second plate body; A first elastic member arranged in the installation space and supported between the first plate body and the second plate body. The first elastic member comprises a plurality of elastic units spaced apart in a first direction and a connecting plate connected between two adjacent elastic units, and the elastic units are in abutment with the first plate body and / or the second plate body. The elastic unit comprises a honeycomb-shaped elastic unit, and the elastic unit has a cavity extending in a second direction.

3. The test fixture of claim 2, wherein, The test piece further comprises a second elastic member arranged in the installation space and spaced apart from the first elastic member in the first direction.

4. The test fixture of claim 3, wherein, The test piece further comprises a first end plate and a second end plate connected to both ends of the first plate body in the first direction, and a third end plate and a fourth end plate connected to both ends of the second plate body in the first direction, wherein 5. The test fixture of claim 2, wherein, The second elastic member has a mounting portion clamped between the first end plate and the third end plate, or the mounting portion is clamped between the second end plate and the fourth end plate.

6. The test fixture of claim 5, wherein, The second elastic member comprises an arc-shaped plate and a mounting portion connected to one end of the arc-shaped plate, and the other end of the arc-shaped plate is a free end, and a limiting plate is arranged in the installation space and spaced apart from the free end and the first elastic member, and the limiting plate limits the deformation amount of the arc-shaped plate by limiting the movement range of the free end, wherein the limiting plate is arranged on the first plate body or the second plate body. The mounting portion comprises a first folded plate and a second folded plate and a third folded plate connected to both ends of the first folded plate in the first direction, and the second folded plate and the third folded plate are arranged in parallel to form a limiting groove between the first folded plate, the second folded plate and the third folded plate, wherein the first end plate is inserted into the limiting groove, or the fourth end plate is inserted into the limiting groove.

7. The test fixture of claim 6, wherein, The first end plate is inserted into the limiting groove, the arc-shaped plate protrudes towards the second plate body and is spaced apart from the second plate body in a third direction; or 8. The test fixture of claim 7, wherein, The fourth end plate is inserted into the limiting groove, the arc-shaped plate protrudes towards the first plate body and is spaced apart from the first plate body in a third direction.

9. The test fixture of claim 8, wherein, At least one of the first cover plate and the second cover plate is formed with a limiting rib extending in the second direction, the limiting ribs are arranged in pairs in the first direction, and the test piece is arranged between the limiting ribs. ​ 10. The test fixture of any one of claims 1-9, wherein, ​ 11. The test fixture of any one of claims 1-9, wherein, The first cover plate and the second cover plate are connected by a fastener penetrating a connecting hole formed on each of the first cover plate and the second cover plate, and a sink is formed around the side of the connecting hole facing away from the test space.

12. The test fixture of any one of claims 1-9, wherein, Also included are: a movable plate disposed between the test piece and at least one of the first cover plate and the second cover plate and defining a receiving space; a pressure sensor disposed in the receiving space.

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