Battery module testing device

Abstract

The utility model provides a battery module testing device, and belongs to the technical field of new energy battery testing equipment. The battery module testing device comprises a testing box and a testing assembly, the testing box comprises a lower box body and a box cover, the box cover covers the lower box body and is fixedly connected with the lower box body through bolts, a sealing ring is arranged between the box cover and the lower box body, and the side wall of the lower box body is provided with a wiring harness port and an air guide port. The testing assembly comprises a barometer and a gas monitoring device, the barometer is arranged on the box cover and used for recording gas pressure in the testing box, and the gas monitoring device is arranged on the inner wall of the lower box body and used for detecting gas components. By adopting the battery module testing device, the gas production test of the battery module is facilitated, and the safety is ensured at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy battery testing equipment, in particular to a battery module testing device. Background Art

[0002] Lithium-ion batteries, currently one of the most popular energy storage devices, are widely used in new energy vehicles, various portable electronic devices, and communications equipment. With the continuous advancement of lithium-ion battery technology, especially the explosive growth of the new energy vehicle industry, the need to improve vehicle space utilization has led to higher requirements for the overall footprint of lithium-ion batteries. CTP, or Cell To Pack, is a battery module structure that directly integrates the battery cell pack into the battery pack housing, eliminating the intermediate module structure, simplifying the battery pack structure, and ultimately improving battery pack space utilization.

[0003] In related technologies, multiple single cells are stacked in a battery pack case and connected in series and parallel using a busbar structure welded on top of the cells to form a battery module. This improves the overall energy density and power density to meet the power requirements of energy vehicles.

[0004] Lithium-ion battery modules typically operate at high temperatures. A series of chemical reactions between the positive and negative electrode materials and the electrolyte within them generate gas, which in turn causes the battery to swell. Once the gas reaches a certain pressure, the lithium battery explosion-proof valve explodes, allowing the gas to escape. To ensure the safety of the battery case and the entire vehicle under these sudden conditions, it is necessary to test the gas production and composition of the battery module during an accident. However, conducting uncontrolled testing directly in the laboratory presents safety risks, and the irritating gases produced during the experiment also pose potential hazards to experimenters and the environment. Utility Model Content

[0005] The present invention provides a battery module testing device and a battery pack, which facilitates gas production testing of the battery module while ensuring safety. The technical solution is as follows:

[0006] The present invention provides a battery module testing device, comprising: a test box and a test assembly.

[0007] The test box includes a lower box body and a box cover, the box cover is arranged on the lower box body and fixedly connected by bolts, a sealing ring is arranged between the box cover and the lower box body, and a wiring harness port and an air guide port are arranged on the side wall of the lower box body;

[0008] The test assembly includes a pressure gauge and a gas monitoring device. The pressure gauge is arranged on the box cover and is used to record the air pressure in the test box. The gas monitoring device is arranged on the inner wall of the lower box body and is used to detect gas composition.

[0009] Optionally, two wiring harness ports are provided, and are arranged at intervals in the horizontal direction on the same side wall of the lower box body.

[0010] Optionally, the lower box body is in the shape of a rectangular parallelepiped, and the wiring harness opening and the air guide opening are respectively arranged on two opposite side walls of the lower box body in the length direction.

[0011] Optionally, a sealing strip groove is provided around the top end surface of the lower box body.

[0012] Optionally, the outer contour of the box cover covers the outer contour of the top end surface of the lower box body.

[0013] Optionally, a plurality of first bolt holes are provided on the box cover, and the plurality of first bolt holes are evenly spaced around the edge of the box cover; a plurality of mounting flanges are correspondingly provided on the outer side wall of the lower box body, and the mounting flanges are provided with second bolt holes matching the first bolt holes.

[0014] Optionally, a limiting protrusion is protruding from the top end surface of the lower box body, and a limiting groove matching the limiting protrusion is provided on the bottom surface of the box cover.

[0015] Optionally, a holding handle is further included, and the holding handle is detachably connected to the box cover.

[0016] The beneficial effects of the technical solution provided by the embodiment of the utility model include at least:

[0017] The battery module testing device provided by the embodiment of the present invention is adopted. A special test box is prepared for the battery module to accommodate it. A wiring harness port is opened on the side wall of the lower box body to introduce the wiring harness of the external test equipment and connect it to the battery module to control its circulation work. An air pump is set by setting an air guide port to connect to the external air source to evacuate and fill with nitrogen to provide a gas test environment in the test box. The box cover is closed on the fixed cover and a sealing ring is set to achieve a stable seal. When performing a gas production test, the internal air pressure before and after gas production is detected by a barometer to calculate the gas production volume, and the specific composition of the gas produced inside the test box is detected by a gas monitoring device. The structure is simple and easy to install. At the same time, when a thermal runaway accident occurs in the internal battery module, or when an over-critical test is deliberately performed, the test box can be used as an explosion-proof structure to avoid danger to the experimenter. At the same time, the internal gas can also be promptly extracted and discharged through the air guide port to avoid explosion hazards. While facilitating the gas production test of the battery module, the test safety is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is a three-dimensional exploded view of one side of the battery module testing device provided by an embodiment of the present utility model;

[0020] Figure 2 This is an exploded view of the three-dimensional structure of the other side of the battery module testing device provided by an embodiment of the present utility model;

[0021] Figure 3 It is a schematic diagram of the bottom structure of the box cover provided by an embodiment of the utility model.

[0022] In the figure: 1-test box; 2-test assembly; 3-sealing ring; 4-gripping handle; 11-lower box body; 12-box cover; 13-mounting flange; 14-limiting protrusion; 21-pressure gauge; 22-gas monitoring device; 111-wiring harness port; 112-air guide port; 113-sealing strip groove; 121-first bolt hole; 122-limiting groove; 123-third bolt hole; 131-second bolt hole; m-battery module. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0024] Figure 1 This is a three-dimensional exploded view of one side of the battery module testing device provided by an embodiment of the present utility model; Figure 2 This is an exploded view of the three-dimensional structure of the other side of the battery module testing device provided by an embodiment of the present utility model; Figure 3 This is a schematic diagram of the bottom structure of the box cover provided by the embodiment of the utility model. Figures 1 to 3 As shown, an embodiment of the present invention provides a battery module testing device, including a test box 1 and a test assembly 2.

[0025] The test box 1 includes a lower box body 11 and a box cover 12. The box cover 12 is mounted on the lower box body 11 and fixedly connected by bolts, with a sealing ring 3 disposed between the box cover 12 and the lower box body 11. The side walls of the lower box body 11 are provided with a wiring harness port 111 and an air guide port 112.

[0026] The test assembly 2 includes a barometer 21 and a gas monitoring device 22. The barometer 21 is provided on the box cover 12 for recording the air pressure in the test box 1, and the gas monitoring device 22 is provided on the inner wall of the lower box body 11 for detecting the gas composition.

[0027] In an embodiment of the present invention, when a gas production test of a battery module is required, the battery module m to be tested can be placed in the lower box 11. In this embodiment, the test box 1 is also configured as a rectangular parallelepiped for the long battery module m formed by stacking large square lithium batteries. The battery module m is embedded and installed in the lower box 11 along its stacking direction, that is, the length direction of the test box 1. Through dimensional design planning, one end of the battery module m abuts against the inner wall of one side of the lower box 11 in the longitudinal direction, and there is a certain gap between it and the inner wall of the other side in the longitudinal direction. The gas monitoring device 22 located on the inner wall of the lower box 11 can be placed in this gap to avoid interference. After the battery module m is placed in the box, the test harness is passed from the outside into the test box 1 through the harness port 111 and connected to the single cells or busbars on the battery module m, so that the battery module m can be controlled by the external test equipment to perform normal charge and discharge cycles. After the harness is connected, the harness port 111 is sealed with sealant. The box lid 12 is secured to the lower box body 11 to complete the seal. The sealing ring 3 is clamped to ensure the sealing of the inner cavity and prevent gas leakage during the test. At the same time, a pipe is used to connect the external air pump to the air inlet 112, exhausting the air from the test box 1 and flushing it with nitrogen. The initial internal air pressure is recorded using the barometer 21 on the box lid 12. During the gas production test, the internal battery module m is controlled to cycle under different operating conditions. After several cycles, the internal air pressure after gas production is recorded using the barometer 21. The gas production volume is then calculated using the volumetric method. At the same time, the specific composition of the internal gas produced is monitored in real time using the gas monitoring device 22.

[0028] The battery module testing device provided in the embodiment of the present invention is used. A dedicated test box 1 is prepared for accommodating the battery module m. A wiring harness port 111 is provided on the side wall of the lower box body 11 to introduce the wiring harness of the external test equipment and connect it to the battery module m to control its circulation operation. An air pump is provided through an air guide port 112 to connect to an external air source to evacuate and fill with nitrogen to provide a gas test environment within the test box 1. The box lid 12 is closed on the fixed cover and a sealing ring 3 is provided to achieve a stable seal. During the gas production test, the internal air pressure before and after gas production is detected by a barometer 21 to calculate the gas production volume. The specific composition of the gas produced inside the test box 1 is detected by a gas monitoring device 22. The structure is simple and easy to install. At the same time, when the internal battery module m experiences a thermal runaway accident or when a critical test is intentionally performed beyond the standard, the test box 1 can serve as an explosion-proof structure to avoid danger to the experimenter. At the same time, the internal gas can be promptly extracted and discharged through the air guide port 112 to avoid the risk of explosion. This ensures test safety while facilitating the battery module gas production test.

[0029] Optionally, two harness ports 111 are provided, spaced apart horizontally on the same side wall of the lower case 11. For example, in an embodiment of the present invention, by providing a plurality of harness ports 111, the positive and negative electrodes of the cells on the battery module m can be connected to the busbar or poles and the harness, respectively, and the electrodes are led out through the two harness ports 111 for layout, thereby improving testing convenience.

[0030] Optionally, the lower box 11 is a rectangular parallelepiped, and the harness port 111 and the air guide port 112 are respectively provided on two opposite longitudinal walls of the lower box 11. For example, in the embodiment of the present invention, the harness port 111 and the air guide port 112 are respectively provided on the two side walls of the lower box 11 that are furthest apart, to avoid affecting the internal connection harness during inflation and deflation, thereby improving test stability.

[0031] Optionally, a sealing strip groove 113 is provided around the top end surface of the lower box body 11. For example, in the present embodiment of the present invention, by providing the sealing strip groove 113 on the top end surface of the lower box body 11, it is convenient to install the sealing ring 3 corresponding to the sealing strip groove 113 for position fixation during the assembly process, thereby preventing the sealing ring 3 from sliding, dislocating, and loosening during the closing of the upper box cover 12 and subsequent testing, thereby improving the overall sealing performance of the battery module testing device.

[0032] Optionally, the outer contour of the box cover 12 covers the outer contour of the top end surface of the lower box body 11. For example, in an embodiment of the present invention, by setting the outer contour of the box cover 12 to be larger than the outer contour of the top end surface of the lower box body 11, it is ensured that the box cover 12 completely covers the top opening of the lower box body 11 after closing, thereby further improving the sealing performance. Furthermore, a plurality of first bolt holes 121 are provided on the box cover 12, and the plurality of first bolt holes 121 are evenly spaced around the edge of the box cover 12. A plurality of mounting flanges 13 are correspondingly provided on the outer side wall of the lower box body 11, and the mounting flanges 13 are provided with second bolt holes 131 that match the first bolt holes 121. By providing a plurality of first bolt holes 121 around the outer contour of the box cover 12 to correspond to the second bolt holes 131 on the lower mounting flange 13, the box cover 12 and the lower box body 11 are fixed with multi-point bolts by screwing in bolts. The structure is simple, the assembly is convenient, and the overall assembly stability can be guaranteed.

[0033] Optionally, a limiting protrusion 14 is provided on the top end surface of the lower housing 11, and a limiting groove 122 is provided on the bottom surface of the housing cover 12 to match the limiting protrusion 14. For example, in the embodiment of the present invention, during the closing process of the housing cover 12, only by aligning the limiting groove 122 on its bottom with the limiting protrusion 14 protruding from the top end surface of the lower housing 11 and cooperating with it can the housing cover 12 be fully closed, thus providing a limiting guide during installation. Furthermore, after closing, the matching mechanism between the limiting protrusion 14 and the limiting groove 122 further limits and secures the housing cover 12 in the horizontal direction, preventing slippage and further improving assembly stability.

[0034] Optionally, a gripping handle 4 is further included, which is detachably connected to the lid 12. For example, in this embodiment of the present invention, a third bolt hole 123 can be provided on the side surface of the lid 12. The end of the gripping handle 4 is secured to the third bolt hole 123 via a bolt, thereby connecting the gripping handle 4 to the lid 12, facilitating assembly, maintenance, and replacement. The provision of the gripping handle 4 facilitates opening and transporting the test box 1 by the experimenter, further enhancing its practicality.

[0035] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by persons of ordinary skill in the field to which the present invention belongs. The terms "first", "second" and similar words used in the specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, terms such as "a" or "an" do not indicate a quantity limitation, but rather indicate the presence of at least one. Terms such as "include" or "comprising" mean that the elements or objects appearing before "include" or "comprising" include the elements or objects listed after "include" or "comprising" and their equivalents, and do not exclude other elements or objects. Terms such as "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Terms such as "upper", "lower", "left", and "right" are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0036] The above description is only an optional embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A battery module testing device, characterized in that: include: A test box (1) and a test assembly (2), The test box (1) comprises a lower box body (11) and a box cover (12), wherein the box cover (12) is arranged on the lower box body (11) and is fixedly connected by bolts, a sealing ring (3) is arranged between the box cover (12) and the lower box body (11), and a wiring harness port (111) and an air guide port (112) are arranged on the side wall of the lower box body (11); The test assembly (2) comprises a pressure gauge (21) and a gas monitoring device (22); the pressure gauge (21) is arranged on the box cover (12) and is used to record the air pressure in the test box (1); the gas monitoring device (22) is arranged on the inner wall of the lower box body (11) and is used to detect gas components.

2. A battery module testing device according to claim 1, characterized in that: Two harness openings (111) are provided and are arranged at intervals in the horizontal direction on the same side wall of the lower box (11).

3. A battery module testing device according to claim 2, characterized in that: The lower box body (11) is in the shape of a rectangular parallelepiped, and the harness opening (111) and the air guide opening (112) are respectively arranged on two opposite side walls of the lower box body (11) in the length direction.

4. The battery module testing device according to claim 1, characterized in that: A sealing strip groove (113) is provided around the top end surface of the lower box body (11).

5. A battery module testing device according to any one of claims 1 to 4, characterized in that: The outer contour of the box cover (12) covers the outer contour of the top end surface of the lower box body (11).

6. A battery module testing device according to any one of claims 1 to 4, characterized in that: The box cover (12) is provided with a plurality of first bolt holes (121), and the plurality of first bolt holes (121) are evenly spaced around the edge of the box cover (12); the outer side wall of the lower box body (11) is correspondingly provided with a plurality of mounting flanges (13), and the mounting flanges (13) are provided with second bolt holes (131) matching the first bolt holes (121).

7. The battery module testing device according to any one of claims 1 to 4, characterized in that: A limiting protrusion (14) is protruding from the top end surface of the lower box body (11), and a limiting groove (122) matching the limiting protrusion (14) is provided on the bottom surface of the box cover (12).

8. The battery module testing device according to any one of claims 1 to 4, characterized in that: It also includes a gripping handle (4), which is detachably connected to the box cover (12).

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