Battery shell charging and discharging radial expansion testing device for automobile

Abstract

The utility model discloses an automobile battery shell charging and discharging radial expansion testing device. The automobile battery shell charging and discharging radial expansion testing device comprises an installation frame, a battery core body, a connecting tool and a sealing sleeve. The installation frame comprises an inner groove and an injection hole formed in a frame body of the frame. The battery core body is connected and mounted at the bottom of the inner groove, and an annular groove is formed in the non-connecting end of the battery core body; the connecting tool is formed by splicing four valves, each valve is provided with a boss, after the four valves are spliced, the multiple bosses are spliced to form an annular table, the annular table is used for being matched with the annular groove, after the four valves are spliced to form the connecting tool, the connecting tool is constructed to be of a hollow structure, and the hollow structure is communicated with the injection hole; the sealing sleeve sleeves the outer side of the connecting tool; and after the target medium is injected into the injection hole, the battery core body is expanded along the radial direction by the connecting tool. The radial expansion of the battery core is realized based on the connecting tool, the operation is simple and convenient, and the repeatability is good.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery performance testing, and in particular relates to a charging and discharging radial expansion testing device for a battery shell for an automobile. Background Art

[0002] Lithium-ion batteries will swell during use. As the number of charge and discharge times accumulates, the expansion phenomenon becomes more obvious. Appropriate pressure helps to tighten the fit between the positive / negative electrode and the diaphragm to reduce the loss of active lithium ions. However, when the pressure exceeds a certain value, the diffusion impedance of lithium ions will increase as the pressure continues to increase, causing the service life of the lithium-ion battery to be greatly reduced. In addition, for battery modules, if the expansion force is not properly handled, the size of the battery module will not meet the standard or the frame of the battery module will be damaged. Therefore, people need to test and understand the expansion of lithium-ion batteries during their life cycle. Based on this, the expansion force testing device was born.

[0003] The traditional expansion force testing device includes a pressure plate, a guide rod, a top plate, a guide sleeve and a pressure sensor. Among them, the pressure plate is suitable for pressing against the top surface of the battery to be tested, and moves up and down as the volume of the battery to be tested expands. The axis of the guide rod is vertically arranged, and the bottom end is fixedly connected to the pressure plate, which can move up and down with the pressure plate and guide the moving direction of the pressure plate. The top plate is arranged above the pressure plate, and a limiting hole is provided for the top end of the guide rod to pass through. The guide sleeve is arranged in the limiting hole, the outer wall is fixedly connected to the hole wall of the limiting hole, and the inner wall is in contact with the side wall of the guide rod, which not only plays a guiding and limiting role for the guide rod, but also can avoid wear between the top plate and the guide rod. The pressure sensor is fixed on the bottom surface of the top plate, which can sense the upward force of the pressure plate to measure the expansion force of the battery. The structure is relatively complicated and the repeatability is poor. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a charging and discharging radial expansion test device for a battery casing for an automobile, so as to solve the problems of complicated structure and poor repeatability of the expansion force test device in the prior art.

[0005] The automotive battery housing charging and discharging radial expansion test device of the present application includes:

[0006] A mounting frame, the mounting frame comprising an inner groove and an injection hole provided on a frame body of the frame;

[0007] A battery core, the battery core is connected and installed at the bottom of the inner tank, and a non-connection end of the battery core is provided with an annular groove;

[0008] A connecting tool, wherein the connecting tool is formed by splicing four valves, each valve is provided with a boss, after the four valves are spliced, a plurality of the bosses are spliced ​​to form a ring platform, the ring platform is used to cooperate with the ring groove, after the four valves are spliced ​​to form the connecting tool, the connecting tool is constructed as a hollow structure, and the hollow structure is connected to the injection hole;

[0009] A sealing sleeve, the sealing sleeve being arranged on the outside of the connecting tooling;

[0010] After the target medium is injected into the injection hole, the battery core is expanded radially by the connecting tool.

[0011] Furthermore, the non-connection end of the battery core is also provided with a groove, and the groove shares a groove wall with the annular groove.

[0012] Furthermore, the sealing sleeve is provided with a sleeve groove, and the sleeve groove is sleeved on the ring platform.

[0013] Furthermore, after the four valves are spliced ​​together to form the connecting tool, the connecting tool is constructed as a conical structure.

[0014] Furthermore, after the four valves are spliced ​​together to form the connecting tool, a gap is formed between two adjacent valves, and the gap gradually decreases from the end of the tool where the platform is replaced to the end away from the ring platform.

[0015] Furthermore, the sealing sleeve is provided with a sleeve hole and a transition hole, the diameter of the sleeve hole is larger than the diameter of the transition hole, the sleeve hole is connected with the sleeve groove, the sleeve hole is sleeved on the connecting tooling, the transition hole is arranged at one end away from the sleeve groove on the sealing sleeve, and the transition hole is connected with the injection hole.

[0016] In an implementable solution, the cross-sectional shape of the sealing sleeve is hexagonal.

[0017] The automotive battery housing charging and discharging radial expansion test device of the present application includes a mounting frame, a battery core, a connecting tool and a sealing sleeve, wherein the mounting frame includes an inner groove and an injection hole provided on the frame of the frame; the battery core is connected and installed at the bottom of the inner groove, and a ring groove is provided at the non-connecting end of the battery core; the connecting tool is formed by splicing four valves, each valve is provided with a boss, after the four valves are spliced, a plurality of the bosses are spliced ​​to form a ring platform, the ring platform is used to cooperate with the ring groove, after the four valves are spliced ​​to form the connecting tool, the connecting tool is constructed as a hollow structure, and the hollow structure is connected to the injection hole; the sealing sleeve is sleeved on the outside of the connecting tool; after the target medium is injected into the injection hole, the battery core is radially expanded by the connecting tool. The present application can be constructed into a connecting tool based on four valves, and the radial expansion of the battery core is realized based on the non-integrated relationship of the connecting tool, with a simple structure, convenient operation and good repeatability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0019] Figure 1 It is a structural schematic diagram of the expansion testing device described in the utility model;

[0020] Figure 2 is an exploded view of the expansion testing device described in the utility model;

[0021] Figure 3 It is a structural schematic diagram of the connecting tooling described in the utility model;

[0022] Figure 4 It is a cross-sectional view of the connecting tool described in the utility model;

[0023] Figure 5 It is a partial enlarged view of the expansion testing device described in the utility model;

[0024] In the figure, 1-installation frame, 11-first connecting plate, 12-second connecting plate, 13-third connecting plate, 14-fourth connecting plate, 15-injection hole, 16-inner groove, 2-battery core, 21-ring groove, 22-groove, 23-groove wall, 3-connecting tooling, 31-valve, 32-boss, 33-ring platform, 34-gap, 4-sealing sleeve, 41-sleeve groove, 42-sleeve hole, 43-transition hole. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] In order to solve the problems existing in the prior art, the present application provides a charging and discharging radial expansion test device for a battery casing for an automobile.

[0027] For details, see Figures 1 to 5 As shown, the expansion test device includes a mounting frame 1, a battery core 2, a connecting tool 3 and a seal. Among them, the mounting frame 1 is a rectangular structure, and the mounting frame 1 includes a first connecting plate 11, a second connecting plate 12, a third connecting plate 13 and a fourth connecting plate 14 connected in sequence, and the four connecting plates surround the inner groove 16 of the mounting frame 1. The battery core 2 is connected and mounted on the first connecting plate 11 of the mounting frame 1, and an injection hole 15 is provided on the third connecting plate 13. Specifically, the injection hole 15 is used to inject the target medium, wherein the target medium is an electrolyte. It can be understood that in the radial expansion test of the battery, the electrolyte is an important component of the battery. The electrolyte plays a role in transferring ions between the positive and negative electrodes of the battery, so that the battery can perform electrochemical reactions. When performing the radial expansion test, the liquid medium is mainly used to simulate the environment inside the battery in actual use. In this way, the expansion of the battery during the charging and discharging process can be more accurately evaluated. The selection of the liquid medium is usually related to the type and application of the battery. In one example, the electrolyte can be an organic solution containing lithium salts, such as lithium salts dissolved in carbonates. It is understandable that the electrolyte being a lithium salt dissolved in carbonate is only a preferred embodiment. In a specific battery radial expansion test, the choice of the target medium can be selected based on safety and environmental requirements, and is not specifically limited here.

[0028] Furthermore, a ring groove 21 is provided at the non-connecting end of the battery core 2; the connecting tool 3 is formed by splicing four valves 31, each valve 31 is provided with a boss 32, after the four valves 31 are spliced, a plurality of bosses 32 are spliced ​​to form a ring platform 33, the ring platform 33 is used to cooperate with the ring groove 21, after the four valves 31 are spliced ​​to form the connecting tool 3, the connecting tool 3 is constructed as a hollow structure, and the hollow structure is connected to the injection hole 15; the sealing sleeve 4 is sleeved on the outside of the connecting tool 3; after the target medium is injected into the injection hole 15, the battery core 2 is radially expanded by the connecting tool 3. In one example, after the four valves 31 are spliced ​​to form the connecting tool 3, a gap 34 is formed between two adjacent valves 31, and the gap 34 gradually decreases from the end of the tooling where the platform is replaced to the end away from the ring platform 33. It is understandable that by setting the gap 34 formed between two adjacent valves 31 to gradually decrease from one end of the tooling to the end away from the ring platform 33, the end of the connecting tooling 3 with the ring platform 33 can be fully compressed when the sealing sleeve 4 is sleeved on the connecting tooling 3, so that when the target medium is injected and the ring platform 33 expands the battery core 2, sufficient expansion space is provided for the expansion, reducing the impact of the expansion test effect due to too small expansion. It is understandable that the gap 34 between two adjacent valves 31 can be set based on the diameter of the battery core 2 to meet the expansion test requirements of battery cores 2 with different diameters.

[0029] Furthermore, a groove 22 is further provided at the non-connection end of the battery core 2 , and the groove 22 and the annular groove 21 share a groove wall 23 .

[0030] Furthermore, the sealing sleeve 4 is provided with a sleeve groove 41 , and the sleeve groove 41 is sleeved on the ring platform 33 .

[0031] Furthermore, after the four valves 31 are spliced ​​to form the connection fixture 3, the connection fixture 3 is constructed as a conical structure. It can be understood that constructing the connection fixture 3 as a conical structure can adapt to the size change of the gap 34 at different positions of the gap 34 between two adjacent valves 31, improve the smooth change of the gap 34, and thus improve the expansion stability during the expansion test.

[0032] Furthermore, a sleeve hole 42 and a transition hole 43 are provided on the sealing sleeve 4. The diameter of the sleeve hole 42 is larger than the diameter of the transition hole 43. The sleeve hole 42 is connected with the sleeve groove 41. The sleeve hole 42 is sleeved on the connecting tooling 3. The transition hole 43 is provided at one end away from the sleeve groove 41 on the sealing sleeve 4. The transition hole 43 is connected with the injection hole 15.

[0033] In one practicable solution, the cross-sectional shape of the sealing sleeve 4 is a hexagon. It is understandable that the hexagon is the outer shape structure of the sealing sleeve 4, and in other practicable solutions, the outer shape structure of the sealing sleeve 4 may also be a rectangle, a circle or other polygonal structures.

[0034] Specifically, when conducting an expansion test, the battery core 2 is first mounted and fixed on the mounting frame 1, and then the connecting tool 3 is matched with the battery core 2, and then the sealing sleeve 4 is sleeved on the connecting tool 3, so that the valves 31 at the bottom of the connecting tool 3 (the end with the ring platform 33) are close to each other, so that the gap 34 is reduced, and the target medium is filled into the sealing sleeve 4 until it reaches the battery core 2 and ruptures it.

[0035] The automotive battery housing charging and discharging radial expansion test device of the present application includes an installation frame 1, a battery core 2, a connecting tool 3 and a sealing sleeve 4, the installation frame 1 includes an inner groove 16 and an injection hole 15 opened on the frame body of the frame; the battery core 2 is connected and installed at the bottom of the inner groove 16, and a ring groove 21 is opened at the non-connecting end of the battery core 2; the connecting tool 3 is formed by splicing four valves 31, each valve 31 is provided with a boss 32, after the four valves 31 are spliced, a plurality of bosses 32 are spliced ​​to form an annular platform 33, the annular platform 33 is used to cooperate with the annular groove 21, after the four valves 31 are spliced ​​to form the connecting tool 3, the connecting tool 3 is constructed as a hollow structure, and the hollow structure is connected to the injection hole 15; the sealing sleeve 4 is sleeved on the outside of the connecting tool 3; after the target medium is injected into the injection hole 15, the battery core 2 is radially expanded by the connecting tool 3. The present application can construct a connecting tool 3 based on four valves 31, and realize radial expansion of the battery core 2 based on the non-integrated relationship of the connecting tool 3. It has a simple structure, convenient operation and good repeatability.

[0036] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

[0037] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A charging and discharging radial expansion test device for a battery housing for an automobile, characterized in that: The device comprises: A mounting frame (1), the mounting frame (1) comprising an inner groove (16) and an injection hole (15) provided on a frame body of the frame; A battery core (2), the battery core (2) being connected and mounted on the bottom of the inner groove (16), and a non-connection end of the battery core (2) being provided with an annular groove (21); A connecting tool (3), wherein the connecting tool (3) is formed by splicing four valves (31), each valve (31) being provided with a boss (32), and after the four valves (31) are spliced ​​together, a plurality of bosses (32) are spliced ​​together to form an annular platform (33), and the annular platform (33) is used to cooperate with the annular groove (21), and after the four valves (31) are spliced ​​together to form the connecting tool (3), the connecting tool (3) is constructed as a hollow structure, and the hollow structure is connected to the injection hole (15); A sealing sleeve (4), the sealing sleeve (4) being sleeved on the outside of the connecting tooling (3); After the target medium is injected into the injection hole (15), the battery core (2) is expanded radially by the connecting tool (3).

2. The automotive battery housing charge and discharge radial expansion test device according to claim 1, characterized in that: The non-connection end of the battery core (2) is also provided with a groove (22), and the groove (22) and the annular groove (21) share a groove wall (23).

3. The automotive battery housing charge and discharge radial expansion test device according to claim 1, characterized in that: The sealing sleeve (4) is provided with a sleeve groove (41), and the sleeve groove (41) is sleeved on the ring platform (33).

4. The automotive battery housing charge and discharge radial expansion test device according to claim 1, characterized in that: After the four valves (31) are spliced ​​together to form the connecting tool (3), the connecting tool (3) is constructed into a conical structure.

5. The automotive battery housing charge and discharge radial expansion test device according to claim 1, characterized in that: After the four valves (31) are spliced ​​together to form the connecting tool (3), a gap (34) is formed between two adjacent valves (31), and the gap (34) gradually decreases from the end of the tool where the platform is replaced to the end away from the ring platform (33).

6. The automotive battery housing charge and discharge radial expansion test device according to claim 3, characterized in that: The sealing sleeve (4) is provided with a sleeve hole (42) and a transition hole (43); the diameter of the sleeve hole (42) is larger than the diameter of the transition hole (43); the sleeve hole (42) is communicated with the sleeve groove (41); the sleeve hole (42) is sleeved on the connecting tool (3); the transition hole (43) is provided at an end away from the sleeve groove (41) on the sealing sleeve (4); and the transition hole (43) is communicated with the injection hole (15).

7. The automotive battery housing charge and discharge radial expansion test device according to claim 1, characterized in that: The cross-sectional shape of the sealing sleeve (4) is hexagonal.

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