Battery testing device

Abstract

The utility model provides a battery testing device, the battery testing device is used for testing a battery module, and the battery module comprises a box body and at least one battery monomer located in an inner cavity of the box body; the battery testing device comprises a testing base, a first detection unit and a second detection unit. The battery module is used for being fixed on the test base; the first detection unit is arranged on the test base and provided with a first detection end, the first detection end penetrates through the box body and abuts against the outer wall of the single battery, and the first detection unit is used for measuring the displacement amount of the first detection end when the single battery expands; the second detection unit is arranged on the test base and provided with a second detection end, the second detection end abuts against the outer wall of the box body, and the second detection unit is used for measuring the displacement amount of the second detection end when the battery monomers expand. The detection result of the battery testing device can well reflect the actual expansion condition of the battery module, and the accuracy of the obtained result is improved.

Description

Technical Field

[0001] The present disclosure relates to the field of battery technology, and in particular to a battery testing device. Background Art

[0002] In the context of the country's advocacy of green travel, electric vehicles are regarded as the mainstream mode of travel in the future. Electric vehicles are equipped with battery packs that can store electrical energy. The battery packs can provide energy for the motor to drive the electric vehicle to move.

[0003] Due to technological limitations, current mainstream battery packs all have certain instability. During long-term use of the battery pack, the battery cells inside the battery pack may swell, and after the battery cells swell, they may explode or spontaneously combust, which will not only cause property damage, but is also likely to endanger the lives of drivers and passengers.

[0004] Therefore, before battery cars are put on the market, it is necessary to ensure the safety of the battery pack and conduct sufficient safety tests on the battery pack. The swelling of the battery pack is also an important parameter for testing the safety performance of the battery pack.

[0005] In existing test devices for measuring battery pack bulging and expansion, force sensors are mostly used to detect battery deformation. However, installing force sensors on battery modules requires overall modification of the battery module structure, which will cause a significant change in the stiffness of the battery module structure. As a result, the test results cannot reflect the actual expansion of the battery module. Moreover, only the force data of the battery module after bulging and expansion can be obtained, and the actual deformation state of the battery module cannot be obtained. Summary of the invention

[0006] In view of this, an embodiment of the present disclosure provides a battery testing device.

[0007] According to a first aspect of an embodiment of the present disclosure, a battery testing device is provided, the battery testing device being configured to test a battery module, wherein the battery module comprises a box body and at least one battery cell located in an inner cavity of the box body;

[0008] The battery testing device comprises:

[0009] A test base, the battery module is configured to be fixed on the test base;

[0010] a first detection unit, the first detection unit being disposed on the test base and having a first detection end, the first detection end being configured to penetrate the box body and abut against an outer wall of the battery cell, the first detection unit being configured to measure a displacement of the first detection end when the battery cell expands;

[0011] The second detection unit is arranged on the test base and has a second detection end, the second detection end is constructed to abut against the outer wall of the box body, and the second detection unit is configured to measure the displacement of the second detection end when the battery cell expands.

[0012] In one embodiment of the present disclosure, at least two of the first detection units are provided, and / or at least two of the second detection units are provided.

[0013] In one embodiment of the present disclosure, the first detection unit includes a first central detection unit and / or a first edge detection unit, wherein a first detection end of the first central detection unit abuts against a central region of the battery cell, and a first detection end of the first edge detection unit abuts against an edge region of the battery cell;

[0014] And / or, the second detection unit includes a second central detection unit and / or a second edge detection unit, the second detection end of the second central detection unit abuts against the central area of ​​the outer wall of the box body, and the second detection end of the second edge detection unit abuts against the edge area of ​​the outer wall of the box body.

[0015] In one embodiment of the present disclosure, the first detection unit includes at least two first edge detection units, and the first detection ends of the first edge detection units are symmetrically distributed at positions abutting against the battery cells;

[0016] And / or, the second detection unit includes at least two second edge detection units, and the second detection ends of the second edge detection units are symmetrically distributed at positions abutting against the outer wall of the box body.

[0017] In one embodiment of the present disclosure, four first edge detection units are provided, and the first detection ends of the four first edge detection units abut against the four corners of the battery cell; and / or, four second edge detection units are provided, and the second detection ends of the four second edge detection units abut against the four corners of the outer wall of the box body.

[0018] In one embodiment of the present disclosure, the first detection unit and the second detection unit are micrometers;

[0019] The test base includes a first side wall and a second side wall located on both sides of the battery module; the first detection unit has a first reference end, the first reference end abuts against the first side wall, and the second detection unit has a second reference end, the second reference end abuts against the second side wall.

[0020] In one embodiment of the present disclosure, a fixing portion is provided on the first side wall and the second side wall, a first fixing end is provided on the surface body of the first detection unit, and a second fixing end is provided on the surface body of the second detection unit, and the first fixing end and the second fixing end are fixedly provided on the fixing portions at corresponding positions.

[0021] In one embodiment of the present disclosure, the battery module includes at least two battery cells, and each of the battery cells is configured to be arranged from a first side of the inner cavity to a second side of the inner cavity along a thickness direction thereof.

[0022] In one embodiment of the present disclosure, the first detection unit and the second detection unit are one of a laser displacement sensor, a magnetostrictive displacement sensor, and a potentiometer displacement sensor.

[0023] In one embodiment of the present disclosure, it further includes: a modeling unit, wherein the modeling unit is configured to obtain an expansion deformation model of the battery module through the displacement obtained by the first detection unit and / or the displacement obtained by the second detection unit.

[0024] During the use of the battery testing device disclosed in the present invention, before the battery module is fixed on the test base, a through hole can be opened on the outer wall of one side of the box body of the battery module, and then the battery module, the first detection unit, and the first detection unit are all arranged on the test base, and the first detection end of the first detection unit passes through the box body and abuts against the outer wall of the battery cell, and the second detection end of the second detection unit abuts against the outer wall of the box body.

[0025] In this way, during the repeated charging and discharging of the battery module, the first detection unit can measure the displacement of the first detection end when the battery cell expands, and thus obtain the expansion displacement of the battery cell. The second detection unit can measure the displacement of the second detection end when the battery cell expands, and thus obtain the expansion displacement of the outer wall of the box body of the battery module when the battery cell expands.

[0026] Compared with the existing battery testing device, the battery testing device disclosed in the present invention has a relatively small change to the structure of the battery module. It only needs to open a through hole on the outer wall of one side of the box body of the battery module, and the rigidity of the battery module structure is relatively small, so that the detection result can better reflect the actual expansion of the battery module, and improve the accuracy of the obtained result. Moreover, in the battery testing device disclosed in the present invention, the first detection unit obtains the expansion displacement of the battery cell, and the second detection unit obtains the expansion displacement of the outer wall of the box body of the battery module when the battery cell expands, so that the tester can easily obtain the real deformation state of the battery module, and then optimize the battery module structure according to the real deformation state of the battery module, and improve the safety of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a three-dimensional diagram of a battery testing device provided by an embodiment of the present disclosure;

[0028] Figure 2 is a cross-sectional view of a battery testing device provided by an embodiment of the present disclosure;

[0029] Figure 3 is an internal side view of a battery testing device provided by an embodiment of the present disclosure;

[0030] Figure 4 It is an internal stereoscopic diagram of a battery testing device provided by an embodiment of the present disclosure.

[0031] Figures 1 to 4 The one-to-one correspondence between the component names and the reference numerals is as follows:

[0032] 10. Battery module; 11. Battery cell; 12. Box body; 20. Battery testing device; 21. First detection unit; 211. First detection end; 212. First reference end; 213. First center detection unit; 214. First edge detection unit; 22. Second detection unit; 221. Second detection end; 222. Second reference end; 223. Second center detection unit; 224. Second edge detection unit; 23. First side wall; 24. Second side wall; 25. Fixing part; 26. Test base. DETAILED DESCRIPTION

[0033] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that unless specifically stated otherwise, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present disclosure. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values.

[0034] Many specific details are set forth in the following description to facilitate a full understanding of the present disclosure. However, the present disclosure can be implemented in many other ways than those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present disclosure, so the present disclosure is not limited to the specific implementation disclosed below. Techniques, methods, and devices known to ordinary technicians in the relevant fields may not be discussed in detail, but where appropriate, the techniques, methods, and devices should be considered as part of the specification.

[0035] The terms used in one or more embodiments of the present disclosure are only for the purpose of describing specific embodiments, and are not intended to limit one or more embodiments of the present disclosure. The singular forms of "a", "said" and "the" used in one or more embodiments of the present disclosure and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used in one or more embodiments of the present disclosure refers to and includes any or all possible combinations of one or more associated listed items.

[0036] It should be understood that, although the terms first, second, etc. may be used to describe various information in one or more embodiments of the present disclosure, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of one or more embodiments of the present disclosure, the first may also be referred to as the second, and similarly, the second may also be referred to as the first. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determination". In this article, "upper", "lower", "front", "back", "left", "right", etc. are only used to indicate the relative position relationship between the relevant parts, rather than to limit the absolute position of these relevant parts. In this article, "equal", "same", etc. are not strictly mathematical and / or geometrical limitations, but also include errors that can be understood by those skilled in the art and allowed by manufacturing or use. Unless otherwise specified, the numerical range herein includes not only the entire range within its two endpoints, but also includes several sub-ranges contained therein.

[0037] The present disclosure provides a battery testing device, which is configured to test a battery module, wherein the battery module includes a box body and at least one battery cell located in an inner cavity of the box body. The battery testing device includes a test base, a first detection unit, and a second detection unit. The battery module is configured to be fixed on the test base. The first detection unit is disposed on the test base and has a first detection end, the first detection end is configured to penetrate the box body and abut against an outer wall of the battery cell, and the first detection unit is configured to measure the displacement of the first detection end when the battery cell swells. The second detection unit is disposed on the test base and has a second detection end, the second detection end is configured to abut against an outer wall of the box body, and the second detection unit is configured to measure the displacement of the second detection end when the battery cell swells.

[0038] During the use of the battery testing device disclosed in the present invention, before the battery module is fixed on the test base, a through hole can be opened on the outer wall of one side of the box body of the battery module, and then the battery module, the first detection unit, and the first detection unit are all arranged on the test base, and the first detection end of the first detection unit passes through the box body and abuts against the outer wall of the battery cell, and the second detection end of the second detection unit abuts against the outer wall of the box body.

[0039] In this way, during the repeated charging and discharging of the battery module, the first detection unit can measure the displacement of the first detection end when the battery cell expands, and thus obtain the expansion displacement of the battery cell. The second detection unit can measure the displacement of the second detection end when the battery cell expands, and thus obtain the expansion displacement of the outer wall of the box body of the battery module when the battery cell expands.

[0040] Compared with the existing battery testing device, the battery testing device disclosed in the present invention has a relatively small change to the structure of the battery module. It only needs to open a through hole on the outer wall of one side of the box body of the battery module, and the rigidity of the battery module structure is relatively small, so that the detection result can better reflect the actual expansion of the battery module, and improve the accuracy of the obtained result. Moreover, in the battery testing device disclosed in the present invention, the first detection unit obtains the expansion displacement of the battery cell, and the second detection unit obtains the expansion displacement of the outer wall of the box body of the battery module when the battery cell expands, so that the tester can easily obtain the real deformation state of the battery module, and then optimize the battery module structure according to the real deformation state of the battery module, and improve the safety of the battery module.

[0041] For ease of understanding, refer to Figures 1 to 4 , the specific structure and working principle of the battery testing device disclosed in the present invention are explained in detail in combination with an embodiment.

[0042] like Figure 1 and Figure 2 As shown, the present disclosure provides a battery testing device 20, which is configured to test a battery module 10, wherein the battery module 10 includes a box body 12 and at least one battery cell 11 located in the inner cavity of the box body 12. It is understandable that the battery module 10 of the present disclosure may include lithium batteries such as lithium iron phosphate batteries and ternary lithium batteries that are widely used in new energy vehicles today, and may also include lithium batteries in other forms such as lithium cobalt oxide, lithium manganese oxide, and lithium nickel oxide, and may also include batteries in other forms such as solid-state batteries and lead-acid batteries, which are not limited here.

[0043] like Figure 2As shown, the battery testing device 20 includes a test base 26, a first detection unit 21 and a second detection unit 22. The battery module 10 is configured to be fixed on the test base 26. The first detection unit 21 is arranged on the test base 26 and has a first detection end 211. The first detection end 211 is configured to penetrate the box body 12 and abut against the outer wall of the battery cell 11. The first detection unit 21 is configured to measure the displacement of the first detection end 211 when the battery cell 11 expands. The second detection unit 22 is arranged on the test base 26 and has a second detection end 221. The second detection end 221 is configured to abut against the outer wall of the box body 12. The second detection unit 22 is configured to measure the displacement of the second detection end 221 when the battery cell 11 expands.

[0044] During the use of the battery testing device 20 of the present invention, before the battery module 10 is fixed on the test base 26, a through hole can be opened on the outer wall of one side of the box body 12 of the battery module 10, and then the battery module 10, the first detection unit 21, and the first detection unit 21 are all arranged on the test base 26, and the first detection end 211 of the first detection unit 21 passes through the box body 12 and abuts against the outer wall of the battery cell 11, and the second detection end 221 of the second detection unit 22 abuts against the outer wall of the box body 12.

[0045] In this way, during the repeated charging and discharging of the battery module 10, the first detection unit 21 can measure the displacement of the first detection end 211 when the battery cell 11 expands, and thus obtain the expansion displacement of the battery cell 11. The second detection unit 22 can measure the displacement of the second detection end 221 when the battery cell 11 expands, and thus obtain the expansion displacement of the outer wall of the box body 12 of the battery module 10 when the battery cell 11 expands.

[0046] Compared with the existing battery testing device 20, the battery testing device 20 of the present disclosure makes relatively minor structural changes to the battery module 10. It only needs to open a through hole on the outer wall of one side of the box body 12 of the battery module 10, and the rigidity of the battery module 10 structure changes slightly, so that the detection result can better reflect the actual expansion of the battery module 10, and improve the accuracy of the obtained results. Moreover, in the battery testing device 20 of the present disclosure, the first detection unit 21 obtains the expansion displacement of the battery cell 11, and the second detection unit 22 obtains the expansion displacement of the outer wall of the box body 12 of the battery module 10 when the battery cell 11 expands, so that the tester can easily obtain the real deformation state of the battery module 10, and then optimize the structure of the battery module 10 according to the real deformation state of the battery module 10, and improve the safety of the battery module 10.

[0047] like Figure 2As shown, in one embodiment of the present disclosure, the battery module 10 includes at least two battery cells 11, and each battery cell 11 is constructed to be arranged along the thickness direction thereof from the first side of the inner cavity to the second side of the inner cavity. It is understandable that during the use of the battery cell 11, its main expansion deformation direction is its thickness direction, and the thickness direction is mostly the direction where the shortest side of its length, width, height and height is located. Since the battery cells 11 are arranged along their thickness direction, the first detection unit 21 and the second detection unit 22 are respectively arranged on the first side and the second side of the battery module 10, and the expansion displacement obtained by the first detection unit 21 and the second detection unit 22 is the expansion amount of the battery module 10 in the thickness direction of the battery cell 11, which can better reflect the actual expansion of the battery module 10.

[0048] Moreover, since each battery cell 11 is arranged from the first side of the inner cavity to the second side of the inner cavity along the thickness direction thereof, the expansion displacement acquired by the first detection unit 21 and the second detection unit 22 is the comprehensive expansion displacement of the displacements of each battery cell 11 after expansion. Thus, even if the displacement after expansion of a single battery cell 11 is relatively small, the first detection unit 21 and the second detection unit 22 can detect it after comprehensiveness, thereby effectively improving the accuracy of the results obtained by the battery testing device 20 disclosed in the present invention.

[0049] Furthermore, in one embodiment of the present disclosure, the battery testing device 20 of the present disclosure further includes a modeling unit, which is configured to obtain an expansion deformation model of the battery module 10 through the displacement obtained by the first detection unit 21 and / or the displacement obtained by the second detection unit 22. After the modeling unit obtains the expansion deformation model of the battery module 10, the tester can obtain the actual deformation state of the battery module 10, and then optimize the structure of the battery module 10 according to the actual deformation state of the battery module 10.

[0050] Further, such as Figure 1 As shown, in one embodiment of the present disclosure, at least two first detection units 21 are provided. Since at least two first detection units 21 are provided. The battery testing device 20 of the present disclosure can effectively integrate the detection results of each first detection unit 21, can reduce the error caused by the result obtained by a single first detection unit 21, and improve the accuracy of the expansion displacement result of the battery cell 11. Similarly, in one embodiment of the present disclosure, at least two second detection units 22 are provided, so that the detection results of each second detection unit 22 can be integrated, can reduce the error caused by the result obtained by a single second detection unit 22, and improve the accuracy of the expansion displacement result of the outer wall of the box body 12 of the battery module 10 when the battery cell 11 expands.

[0051] It is understandable that, due to the packaging structure of the battery cell 11, when the battery cell 11 expands, the expansion amplitudes of the central area and the edge area thereof are not necessarily consistent. Figure 3 As shown, in one embodiment of the present disclosure, the first detection unit 21 includes a first central detection unit 213 and / or a first edge detection unit 214, the first detection end 211 of the first central detection unit 213 abuts against the central area of ​​the battery cell 11, and the first detection end 211 of the first edge detection unit 214 abuts against the edge area of ​​the battery cell 11. In this way, the first central detection unit 213 can obtain the expansion displacement of the central area of ​​the battery cell 11, and the first edge detection unit 214 can obtain the expansion displacement of the edge area of ​​the battery cell 11, and then obtain the expansion amplitude of each part of the battery cell 11 when it expands, so as to facilitate the tester to obtain the real expansion state of the battery cell 11.

[0052] Similarly, in one embodiment of the present disclosure, the second detection unit 22 includes a second center detection unit 223 and / or a second edge detection unit 224, the second detection end 221 of the second center detection unit 223 abuts against the center area of ​​the outer wall of the box body 12, and the second detection end 221 of the second edge detection unit 224 abuts against the edge area of ​​the outer wall of the box body 12. In this way, the second center detection unit 223 can obtain the expansion displacement of the center area of ​​the outer wall of the box body 12, and the second edge detection unit 224 can obtain the expansion displacement of the edge area of ​​the outer wall of the box body 12, and then obtain the expansion amplitude of each part of the outer wall of the box body 12 when the battery cell 11 expands, so as to facilitate the tester to obtain the real expansion state of the outer wall of the box body 12 of the battery module 10.

[0053] Further, such as Figure 3 As shown, in one embodiment of the present disclosure, the first detection unit 21 includes at least two first edge detection units 214, and the first detection end 211 of each first edge detection unit 214 is symmetrically distributed at the position abutting against the battery cell 11. In this way, the battery testing device 20 of the present disclosure can effectively integrate the detection results of each first edge detection unit 214, reduce the error caused by the result obtained by a single first edge detection unit 214, and improve the accuracy of the expansion displacement result of the edge area of ​​the battery cell 11. Similarly, in one embodiment of the present disclosure, the second detection unit 22 includes at least two second edge detection units 224, and the second detection end 221 of each second edge detection unit 224 is symmetrically distributed at the position abutting against the outer wall of the box body 12, so that the detection results of each second edge detection unit 224 can be integrated, the error caused by the result obtained by a single second edge detection unit 224 can be reduced, and the accuracy of the expansion displacement result of the edge area of ​​the outer wall of the box body 12 can be improved.

[0054] Further, such as Figure 3 As shown, in one embodiment of the present disclosure, four first edge detection units 214 are provided, and the first detection ends 211 of the four first edge detection units 214 are abutted against the four corners of the battery cell 11, so that the battery testing device 20 of the present disclosure can effectively integrate the detection results of the four first edge detection units 214, further reduce the error, and improve the accuracy of the expansion displacement results of the edge area of ​​the battery cell 11. Similarly, in one embodiment of the present disclosure, four second edge detection units 224 are provided, and the second detection ends 221 of the four second edge detection units 224 are abutted against the four corners of the outer wall of the box body 12, so as to effectively integrate the detection results of the four second edge detection units 224, further reduce the error, and improve the accuracy of the expansion displacement results of the edge area of ​​the outer wall of the box body 12.

[0055] The types of the first detection unit 21 and the second detection unit 22 can be selected as needed. In one embodiment of the present disclosure, the first detection unit 21 and the second detection unit 22 of the present disclosure are micrometers. It can be understood that when the first detection unit 21 and the second detection unit 22 of the present disclosure are micrometers, the micrometers have a reference end and a measuring end. During the use of the micrometer, the relative displacement of the measuring end relative to the reference end can be obtained. When the first detection unit 21 and the second detection unit 22 of the present disclosure are micrometers, the measurement accuracy can reach 0.001mm level, which is extremely high, can effectively meet the measurement requirements, and improve the accuracy of the results.

[0056] When the first detection unit 21 and the second detection unit 22 of the present disclosure are micrometers, such as Figure 3 As shown, in one embodiment of the present disclosure, the test base 26 includes a first side wall 23 and a second side wall 24 located on both sides of the battery module 10; the first detection unit has a first reference end 212, the first reference end 212 abuts on the first side wall 23, and the second detection unit has a second reference end 222, the second reference end 222 abuts on the second side wall 24. In this way, during the operation of the battery test device 20 of the present disclosure, the first reference end 212 and the second reference end 222 remain stationary, the first detection unit can obtain the relative displacement of the first measuring end relative to the first reference end 212, and then obtain the expansion displacement of the battery cell 11, and the second detection unit can obtain the relative displacement of the second measuring end relative to the second reference end 222, and then obtain the expansion displacement of the outer wall of the box body 12 of the battery module 10 when the battery cell 11 expands. The above method is simple to calibrate and the result is relatively accurate. It can be understood that in order to facilitate data acquisition, an electronic micrometer can be used, and relevant data can be directly obtained using electronic equipment such as a computer.

[0057] In order to realize the fixed installation of the first detection unit 21 and the second detection unit 22, as shown in FIG. Figure 1 and Figure 4 As shown, in one embodiment of the present disclosure, a fixing portion 25 is provided on the first side wall 23 and the second side wall 24, a first fixing end is provided on the surface body of the first detection unit 21, and a second fixing end is provided on the surface body of the second detection unit 22, and the first fixing end and the second fixing end are fixedly provided on the fixing portion 25 at corresponding positions. By providing the fixing portion 25 on the first side wall 23 and the second side wall 24, the fixing of the first detection unit 21 and the second detection unit 22 is effectively facilitated, and the measurement process of the first detection unit 21 and the second detection unit 22 will not be affected. Figure 4 As shown, for the first edge detection unit 214 and the second edge detection unit 224, each edge detection unit can be fixed on a fixing portion 25, or two or more edge detection units can share the same fixing portion 25, which is not limited here.

[0058] In another embodiment of the present disclosure, in the battery testing device 20 of the present disclosure, the first detection unit 21 and the second detection unit 22 are one of a laser displacement sensor, a magnetostrictive displacement sensor, and a potentiometer displacement sensor. When the first detection unit 21 and the second detection unit 22 are one of a laser displacement sensor, a magnetostrictive displacement sensor, and a potentiometer displacement sensor, since the laser displacement sensor, the magnetostrictive displacement sensor, and the potentiometer displacement sensor have high measurement accuracy, they can also effectively meet the measurement requirements.

[0059] It can be understood that in other embodiments of the present disclosure, the first detection unit 21 and the second detection unit 22 can also select other forms of displacement sensors, as long as the measurement accuracy can effectively meet the requirements and can effectively obtain the expansion displacement of the battery cell 11 and the expansion displacement of the outer wall of the box body 12 of the battery module 10 when the battery cell 11 expands, which will not be repeated here.

[0060] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The choice of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the marketplace, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein. The scope of the present disclosure is defined by the appended claims.

Claims

1. A battery testing device, characterized in that: The battery testing device (20) is configured to test a battery module (10), wherein the battery module (10) comprises a box body (12) and at least one battery cell (11) located in an inner cavity of the box body (12); The battery testing device (20) comprises: a test base (26), the battery module (10) being configured to be fixed on the test base (26); a first detection unit (21), the first detection unit (21) being arranged on the test base (26) and having a first detection end (211), the first detection end (211) being configured to penetrate the box body (12) and abut against an outer wall of the battery cell (11), the first detection unit (21) being configured to measure a displacement of the first detection end (211) when the battery cell (11) expands; A second detection unit (22), the second detection unit (22) is arranged on the test base (26) and has a second detection end (221), the second detection end (221) is configured to abut against an outer wall of the box body (12), and the second detection unit (22) is configured to measure the displacement of the second detection end (221) when the battery cell (11) expands.

2. The battery testing device according to claim 1, characterized in that: At least two of the first detection units (21) are provided, and / or at least two of the second detection units (22) are provided.

3. The battery testing device according to claim 2, characterized in that: The first detection unit (21) comprises a first central detection unit (213) and / or a first edge detection unit (214), wherein the first detection end (211) of the first central detection unit (213) abuts against the central area of ​​the battery cell (11), and the first detection end (211) of the first edge detection unit (214) abuts against the edge area of ​​the battery cell (11); And / or, the second detection unit (22) includes a second central detection unit (223) and / or a second edge detection unit (224), the second detection end (221) of the second central detection unit (223) abuts against the central area of ​​the outer wall of the box body (12), and the second detection end (221) of the second edge detection unit (224) abuts against the edge area of ​​the outer wall of the box body (12).

4. The battery testing device according to claim 3, characterized in that: The first detection unit (21) comprises at least two first edge detection units (214), and the positions at which the first detection ends (211) of the first edge detection units (214) abut against the battery cell (11) are symmetrically distributed; And / or, the second detection unit (22) comprises at least two second edge detection units (224), and the second detection ends (221) of the respective second edge detection units (224) are symmetrically distributed at positions abutting against the outer wall of the box body (12).

5. The battery testing device according to claim 4, characterized in that: Four first edge detection units (214) are provided, and the first detection ends (211) of the four first edge detection units (214) abut against the four corners of the battery cell (11); and / or four second edge detection units (224) are provided, and the second detection ends (221) of the four second edge detection units (224) abut against the four corners of the outer wall of the box body (12).

6. The battery testing device according to any one of claims 1 to 5, characterized in that: The first detection unit (21) and the second detection unit (22) are micrometers; The test base (26) comprises a first side wall (23) and a second side wall (24) located on both sides of the battery module (10); the first detection unit (21) has a first reference end (212), the first reference end (212) abuts against the first side wall (23), and the second detection unit (22) has a second reference end (222), the second reference end (222) abuts against the second side wall (24).

7. The battery testing device according to claim 6, characterized in that: The first side wall (23) and the second side wall (24) are provided with a fixing portion (25), the surface body of the first detection unit (21) is provided with a first fixing end; the surface body of the second detection unit (22) is provided with a second fixing end, and the first fixing end and the second fixing end are fixedly arranged on the fixing portion (25) at corresponding positions.

8. The battery testing device according to any one of claims 1 to 5, characterized in that: The battery module (10) comprises at least two battery cells (11), and each of the battery cells (11) is configured to be arranged along a thickness direction thereof from a first side of the inner cavity to a second side of the inner cavity.

9. The battery testing device according to any one of claims 1 to 5, characterized in that: The first detection unit (21) and the second detection unit (22) are one of a laser displacement sensor, a magnetostrictive displacement sensor, and a potentiometer displacement sensor.

10. The battery testing device according to any one of claims 1 to 5, characterized in that: Also includes: A modeling unit, wherein the modeling unit is configured to obtain an expansion deformation model of the battery module (10) through the displacement obtained by the first detection unit (21) and / or the displacement obtained by the second detection unit (22).

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