CN220231928U

CN220231928U - Durable testing arrangement of battery module

Info

Publication number: CN220231928U
Application number: CN202321690678.8U
Authority: CN
Inventors: 雷亚洲; 关义胜; 陈彬彬; 谈作伟; 王雪飞
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2023-06-29
Filing date: 2023-06-29
Publication date: 2023-12-22
Anticipated expiration: 2033-06-29

Abstract

The utility model provides a durable testing device of a battery module. The bearing platform is used for installing the battery module, and the pressure detection subassembly is including locating between at least one of them end plate and the adjacent electric core in the battery module to and locate the membranous pressure detection portion between two adjacent electric cores in the battery module middle part. The temperature and pressure detection assembly is respectively and electrically connected with each electric core so as to detect the temperature and the voltage of each electric core. According to the durability testing device for the battery module, disclosed by the utility model, the pressure in the middle of the battery module is detected through the membranous pressure detecting part arranged between the end plate and the battery cells and the membranous pressure detecting part arranged between the two battery cells in the middle of the battery module, so that the detection precision of the pressure of the battery module can be improved, the detection efficiency is improved, the temperature and the voltage of each battery cell can be obtained, and the detection efficiency and the detection precision of the battery module are further improved.

Description

Durable testing arrangement of battery module

Technical Field

The utility model relates to the technical field of battery module testing, in particular to a battery module endurance testing device.

Background

When the safety test of the existing battery module is carried out, the data such as the cell bulge force, the cell capacity retention rate and the like under the condition of high contact cycle times are very important for judging the performance parameters of the cell and the safety indexes of structural members. Long cycle safety tests with cell cycle numbers above 8000 are generally required. Because the test period is longer, the test period generally lags behind the project development progress, so that when the influence of the cell bulge force on the safety reliability of the battery module is analyzed, the test period can be primarily evaluated only through simulation data, and the data of the feedback battery system cannot be truly and effectively obtained.

Most of the current long-cycle module tests adopt mechanical pressure sensors, so that the acquisition accuracy is low, the corresponding time is long, and data jump is easy to occur. Because the battery cell is easy to cause outward bulge deformation of the middle area of the end plate under long-cycle test, uneven stress of the mechanical pressure sensor is easy to cause inaccurate acquired data.

Disclosure of Invention

In view of the above, the present utility model is directed to a device for testing durability of a battery module, so as to improve the detection efficiency and the detection accuracy of the battery module.

In order to achieve the above purpose, the technical scheme of the utility model is realized as follows:

a durability test device of a battery module comprises a bearing table, a pressure detection assembly and a temperature and pressure detection assembly;

the bearing table is used for installing a battery module;

the pressure detection assembly comprises a membranous pressure detection part which is arranged between at least one end plate and adjacent cells in the battery module and between two adjacent cells in the middle of the battery module;

the temperature and pressure detection assembly is respectively and electrically connected with each electric core so as to detect the temperature and the voltage of each electric core.

Further, the temperature and pressure detection assembly is connected to the top of the battery cell;

and a signal acquisition terminal of the film-shaped pressure detection part extends out of one side of the battery cell.

Further, a cooling channel is arranged in the bearing table, a liquid inlet and a liquid outlet which are communicated with the cooling channel are arranged on the bearing table, and the battery module is located above the cooling channel.

Further, a heat-conducting adhesive is arranged between the bottom of the battery module and the bearing table; and/or the number of the groups of groups,

the cooling channel is serpentine.

Further, the bearing table comprises an upper plate and a lower plate which are connected in an up-down buckling way, and the cooling channel is formed on the upper plate or the lower plate.

Further, the bearing table is provided with supporting bodies corresponding to two ends of the battery module;

the battery module is detachably connected to the support body at the corresponding end via fasteners passing through the end plates.

Further, the support body has a vertical portion and a horizontal portion vertically connected, the horizontal portion being adapted to be connected to the end plate.

Further, the film-like pressure detecting section is a film pressure sensor.

Further, the temperature and pressure detection component is a CCS component.

Further, the device also comprises a constant temperature box and a hoisting part arranged on the bearing table;

the bearing table provided with the battery module is transferred into the constant temperature box through the hoisting part.

Compared with the prior art, the utility model has the following advantages:

according to the durability testing device for the battery module, the pressure at the end part of the battery module can be detected through the film-shaped pressure detecting part arranged between the end plate and the battery cells, and the pressure in the middle of the battery module is detected through the film-shaped pressure detecting part arranged between the two battery cells in the middle of the battery module, so that the detection precision of the pressure of the battery module can be improved, and the detection efficiency is also improved. And moreover, by arranging the temperature and pressure detection assembly, the temperature and the voltage of each battery cell can be obtained, and the detection efficiency and the detection precision of the battery module are further improved.

In addition, through setting up upper plate and hypoplastron, simple structure is convenient for design implementation. And through setting up cooling channel on the bearing platform, can simulate battery module's actual cooling board, promote detection accuracy. And a supporting body is arranged on the bearing table, so that the battery module can be placed conveniently.

In addition, set up the heat conduction glue between battery module bottom and bearing platform, further guarantee that this durable testing arrangement of battery module is the same with the actual arrangement structure of battery module to provide and improve the detection precision, cooling channel is serpentine and is convenient for arrange and implement, and increase the cooling effect.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:

fig. 1 is an exploded view of a battery module according to an embodiment of the present utility model;

fig. 2 is an exploded view of a durability test apparatus for a battery module according to an embodiment of the present utility model;

fig. 3 is a block diagram illustrating a long-cycle battery module test according to an embodiment of the present utility model.

Reference numerals illustrate:

1. a steel strip; 2. a module top cover; 3. an end plate; 4. a second film-like pressure sensor; 5. a battery cell; 6. a first film-like pressure sensor; 7. PET strapping tape; 8. a temperature detection assembly; 9. a bolt; 10. a hoisting part; 11. an elbow; 12. a heat-conducting adhesive; 13. a lower plate; 14. a battery module; 15. a support body; 16. and (5) an upper plate.

Detailed Description

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other.

In the description of the present utility model, it should be noted that, if terms indicating an azimuth or a positional relationship such as "upper", "lower", "inner", "back", and the like are presented, they are based on the azimuth or the positional relationship shown in the drawings, only for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, if any, are also used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The utility model will be described in detail below with reference to the drawings in connection with embodiments.

The embodiment relates to a durability test device for a battery module 14, wherein the durability test device for the battery module 14 comprises a bearing table, a pressure detection assembly and a temperature and pressure detection assembly. The support platform is used for installing the battery module 14, and the pressure detection assembly is including locating between at least its terminal plate 3 and the adjacent electric core 5 in the battery module 14 to and locate the membranous pressure detection portion between two adjacent electric cores 5 in the middle part of the battery module 14. The temperature and pressure detection assembly is respectively and electrically connected with each battery cell 5 so as to detect the temperature and the voltage of each battery cell 5.

The durability test device for the battery module 14 of the embodiment can detect the pressure at the end of the battery module 14 through the film-shaped pressure detection part arranged between the end plate 3 and the battery cells 5, and detect the pressure at the middle of the battery module 14 through the film-shaped pressure detection part arranged between the two battery cells 5 at the middle of the battery module 14, so that the detection precision of the pressure of the battery module 14 can be improved, and the detection efficiency is also improved. And, through setting up temperature and pressure detection subassembly, do benefit to the temperature and the voltage that obtain each electric core 5, further improve detection efficiency and the detection precision of battery module 14.

Based on the above-mentioned overall structure, as shown in fig. 1 and 2, the exemplary structure of the endurance testing apparatus for the battery module 14 of the present embodiment, in which the temperature detecting assembly 8 of the present embodiment employs the integrated busbar of the battery CCS and is disposed in the battery module 14 together with the film-shaped pressure detecting portion, instead of the sampling harness externally disposed outside the battery module 14, can improve the reliability and accuracy of the test. The assembled battery module 14 is fixed on the support table.

As a preferred embodiment, the temperature and pressure detecting assembly of the present embodiment is connected to the top of the battery cell 5. The signal acquisition terminal of the membranous pressure detection part is arranged at one side of the battery cell 5. Structurally, as shown in fig. 1, a temperature detecting assembly 8 is provided above each cell 5.

Through locating membranous pressure detection portion between each electric core 5 to locate each electric core 5 upper portion with temperature-detecting component 8, not only be convenient for implement, and warm-pressing detection component and membranous pressure detection portion can not take place to interfere and influence the overall structure of battery module 14, thereby can further promote the detection precision to battery module 14 in the endurance test, avoid setting up mechanical pressure sensor on battery module 14 like prior art, when the battery bulge force influences and produces the inaccurate problem of detection data when middle part trouble.

As shown in fig. 1, the temperature detecting assembly 8 specifically comprises a support, copper-aluminum bars, an FPC and other structural members, and the battery cells 5 are assembled in series-parallel to form the battery module 14 through the copper-aluminum bars on CCS. The FPC detects and monitors the voltage and the temperature of the battery cell 5 in real time, and transmits a collection signal to the BMU battery management system, so as to realize overcurrent protection and temperature thermal runaway management of the battery module 14. The temperature and pressure detection structure on the battery module 14 is simulated, so that the reliability and the accuracy of the test are improved.

Based on the drawings in fig. 1 and 2, for convenience of description, the length direction of the battery module 14 is defined as the X-direction, the width direction of the battery module 14 is defined as the Y-direction, and the height direction of the battery module 14 is defined as the Z-direction. The following description of the direction of the battery module 14 is replaced by a defined letter.

Preferably, a cooling channel is arranged in the support table of the embodiment, a liquid inlet and a liquid outlet which are communicated with the cooling channel are arranged on the support table, and the battery module 14 is positioned above the cooling channel. Specifically, as shown in fig. 2, the support table of the embodiment is formed in a planar plate-like structure, and a cooling passage of a groove is provided at a side of the support table facing the battery module 14. By the arrangement, the actual cooling plate of the battery module 14 can be simulated, and the detection precision is improved.

Preferably, the support table comprises an upper plate 16 and a lower plate 13 which are connected in a vertically buckled manner, and a cooling channel is formed on the upper plate 16 or the lower plate 13. In a specific structure, as shown in fig. 2, the lower plate 13 of the molding support table is provided with the grooves forming the cooling channels, and the cooling channels are molded in the support table by fixing the upper plate 16 and the lower plate 13, so that external cooling liquid can flow in conveniently, and the cooling liquid in the embodiment can be special cooling liquid or water.

As a specific implementation mode, the grooves of the embodiment are processed in a milling mode, so that the grooves are convenient to machine and apply to test platforms of other battery cell modules. The lower plate 13 has a planar plate-like structure, and the upper plate 16 and the lower plate 13 are fixedly connected by welding, and sealing treatment is performed along the connection part of the peripheral edges of the upper plate 13 and the lower plate 13. In addition, the upper plate 16 and the lower plate 13 can be connected through bolts 9, so that the disassembly is convenient, and a sealing strip with a peripheral ring is arranged between the upper plate 13 and the lower plate 13 to ensure sealing.

In addition, a heat-conducting adhesive 12 is disposed between the bottom of the battery module 14 and the support table, and the cooling channel has a serpentine shape. In a specific configuration, as also shown in FIG. 2, the cooling channels are provided as a plurality of interconnected N-turn serpentine channels. In addition, for the convenience of implementation, the liquid inlet and the liquid outlet are both arranged on the same side of the bearing table. Of course, the liquid inlet and the liquid outlet can be arranged on different sides of the bearing table according to design requirements.

The heat-conducting glue 12 is arranged between the bottom of the battery module 14 and the supporting table, so that the durability testing device of the battery module 14 is further guaranteed to be identical with the actual arrangement structure of the battery module 14, the detection precision is improved, the cooling channel is in a serpentine shape, the arrangement implementation is convenient, and the cooling effect is improved.

In order to facilitate the arrangement of the battery module 14, the support table of the present embodiment is provided with support bodies 15 corresponding to the two ends of the battery module 14, and the battery module 14 is detachably connected to the support bodies 15 at the corresponding ends via fasteners passing through the end plates 3. In a specific structure, as shown in fig. 2, the support body 15 of the present embodiment is formed as an L-shaped plate. Two oppositely arranged supporting bodies 15 are welded and fixed on the upper side of the upper plate 16. Of course, it is also possible to use a screw connection to be detachably connected to the upper plate 16.

Preferably, the film-like pressure detecting section of the present embodiment employs a film pressure sensor. The product is mature, the flexible material can be bent, and the battery cell 5 still has better detection precision when in collision, and meanwhile, the structure influence on the battery module 14 is smaller.

As shown in fig. 1, the battery module 14 includes a plurality of electric cores 5 disposed in the middle, the electric cores 5 are vertically disposed along the Z direction and sequentially arranged along the X direction, wherein a first film pressure sensor is disposed between the two electric cores 5, and a second film pressure sensor is disposed between the end plate 3 and the electric core 5. The acquisition terminals of the first film pressure sensor and the second film pressure sensor are led out from the side face of the battery core 5, namely the Y direction of the battery module 14, so that BMU acquisition lines and pressure acquisition wiring harnesses are separated, and testing is facilitated.

In addition, as a specific embodiment, as shown in fig. 1, a temperature detection assembly 8 is disposed above each battery module 14, the battery cells 5 stacked along the X direction are sleeved with the steel belt 1 after applying a pretightening force, the lower portion of the battery module 14 is bound with the PET tie 7 along the circumference, after the temperature detection assembly 8 is mounted in the length dimension of the module, the temperature detection assembly 8 and each battery cell 5 are welded and fixed by laser welding, and finally the battery module top cover 2 is fixed on the temperature detection assembly 8, so as to complete the preparation of the long-cycle module.

Further, the supporting body 15 has a vertical portion and a horizontal portion connected vertically, the horizontal portion being for connection with the end plate 3. As also shown in fig. 2, the horizontal portions of the two supporting bodies 15 are supported under the battery module 14, and the vertical portions are used to improve the strength of the supporting bodies 15. Wherein, be close to the through-hole that is equipped with respectively with inlet and liquid outlet intercommunication on the battery support body 15 of the one end of inlet and liquid outlet, be connected with business turn over elbow 11 on the through-hole of this battery support body 15 respectively, elbow 11 is used for connecting cooling channel and outside liquid cooling system.

As shown in fig. 2, the assembled and prepared battery module 14 is disposed in a space surrounded by two supporting bodies 15, threaded holes corresponding to the mounting holes of the battery module 14 are formed in the two supporting bodies 15, and the mounting holes are formed in the end plate 3 of the battery module 14 in this embodiment, and the battery module 14 is fastened by penetrating the mounting holes through bolts 9 and connecting and fastening the mounting holes.

In addition, the endurance testing apparatus for the battery module 14 of the present embodiment further includes an incubator, and a hanging portion 10 provided on the support table. The support table with the battery module 14 is transferred to the incubator via the hanging part 10. The arrangement of the incubator can test the durability of the battery module 14 at a specific temperature, and the lifting part 10 is beneficial to transferring the bearing table into the incubator.

In a specific structure, as shown in fig. 2, two ends of a vertical portion of each supporting body 15 are connected with lifting portions 10, and the lifting portions 10 in this embodiment are in threaded connection with lifting rings above the vertical portion. After the battery module 14 is fixed with the supporting table, the battery module 14 endurance test device is transferred to the incubator for pre-test debugging through transfer equipment such as a crane and a hanging ring.

As shown in fig. 3, the testing principle of the endurance testing apparatus for the battery module 14 in this embodiment is that after the endurance testing apparatus for the battery module 14 is assembled by the above-mentioned assembly method, an external liquid cooling system is turned on, so that the cooling operation of the liquid cooling plate is normally operated.

And then the whole set of testing device is placed in an incubator to carry out charge-discharge cycle test on the battery module 14, signals are acquired in the test process, pressure data acquisition is carried out through the first membranous pressure sensor 6 and the second membranous pressure sensor 4, data such as temperature, voltage and capacity of the current core 5 are acquired through a temperature-pressure detection assembly and a BMU acquisition system, and meanwhile, in the long-cycle test process, the length and the size of the battery module 14 are calibrated by using a three-coordinate measuring instrument. In the detection process, the following detection data can be obtained:

the main tests performed during the detection process include providing a relationship curve of the expansion force and the number of cycles, specifically, measuring 5 expansion forces every 50 cycles, collecting the first film-shaped pressure sensor 6 first, and then collecting the second film-shaped pressure sensor 4 at the end, and monitoring the expansion forces for example 46-50, 95-100, 146-150, 195-200, etc. times during the detection process to obtain the relationship curve of the expansion force and the number of cycles.

In addition, in the detection process, a capacity-cycle number relation curve needs to be provided: before the test starts and after every 100 cycles, RPT test is needed, and the temperature, voltage, capacity and other data of the battery cell 5 are monitored in real time in the whole process to obtain a relation curve of capacity and cycle times.

And in the detection process, providing a relation curve of the module size and the cycle times: the three-dimensional measurement measures the module size once every 200 cycles, for example, 0 times, 200 times, 400 times, etc., to obtain a module size versus cycle number curve.

Finally, test data which are closer to the use form of the product are obtained according to the obtained three relation curves, and the performance of the battery cell 5 and the safety index of the structural member are judged, so that the quality and the safety reliability of the battery module 14 can be ensured.

The durability test device for the battery module 14 of the embodiment is used for detecting the pressure of the end part and the middle part of the battery module 14 by the film-shaped pressure detection part arranged between the end plate 3 and the battery cells 5 and the film-shaped pressure detection part arranged between the two battery cells 5 in the middle part of the battery module 14, so that the detection precision of the pressure of the battery module 14 can be improved, and the detection efficiency is also improved. And set up temperature and pressure detection subassembly, do benefit to the temperature and the voltage that obtain each electric core 5, further improve the detection efficiency and the detection precision of battery module 14, can guarantee the quality and the fail safe nature of battery module 14.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims

1. A durable testing arrangement of battery module, its characterized in that:

comprises a bearing table, a pressure detection component and a temperature and pressure detection component;

the bearing table is used for installing a battery module;

2. The battery module durability test apparatus according to claim 1, wherein:

the temperature and pressure detection assembly is connected to the top of the battery cell;

3. The battery module durability test apparatus according to claim 1, wherein:

the bearing table is internally provided with a cooling channel, the bearing table is provided with a liquid inlet and a liquid outlet which are communicated with the cooling channel, and the battery module is positioned above the cooling channel.

4. The battery module durability test apparatus according to claim 3, wherein:

a heat-conducting adhesive is arranged between the bottom of the battery module and the bearing table; and/or the number of the groups of groups,

the cooling channel is serpentine.

5. The battery module durability test apparatus according to claim 3, wherein:

the bearing table comprises an upper plate and a lower plate which are connected in an up-down buckling way, and the upper plate or the lower plate is provided with the cooling channel.

6. The battery module durability test apparatus according to claim 1, wherein:

the bearing table is provided with supporting bodies corresponding to two ends of the battery module;

7. The battery module durability test apparatus according to claim 6, wherein:

the support body has a vertical portion and a vertical portion vertically connected, the horizontal portion being adapted to be connected to the end plate.

8. The battery module durability test apparatus according to claim 1, wherein:

the film-like pressure detecting section is a film pressure sensor.

9. The battery module durability test apparatus according to claim 1, wherein:

the temperature and pressure detection component is a CCS component.

10. The battery module durability test device according to any one of claims 1 to 9, characterized in that:

the device also comprises a constant temperature box and a hoisting part arranged on the bearing table;