Air tightness detection structure for battery box body

Abstract

The utility model relates to the technical field of air tightness detection, in particular to an air tightness detection structure for a battery box body, which comprises a lower box body, an air tightness detection tool and a filling block, and is characterized in that the lower box body is reversely buckled and detachably arranged on the air tightness detection tool; the filling block is arranged in the lower box body and is placed on the air tightness detection tool; the battery pack detection device further comprises compression foam, the compression foam is arranged at the top of the filling block, and the top of the compression foam elastically abuts against the box bottom of the lower box body, so that the pressure of a module on the box bottom during battery pack detection is simulated; the consistency of the air tightness measurement state of the lower box body and the air tightness measurement state of the battery pack can be conveniently realized through the simulated pressure, so that a lower box body manufacturer can conveniently find unqualified products possibly appearing in a subsequent battery pack test stage in a product delivery detection stage, the number of reworked products is effectively reduced, and manpower and material resources are saved.

Description

Technical Field

[0001] The utility model relates to the technical field of airtightness detection, in particular to an airtightness detection structure for a battery box body. Background Technique

[0002] In the new energy vehicle industry, as one of the important components, the airtightness of the battery box body is crucial for ensuring the safety and reliability of the battery system. In order to ensure that the airtightness of the battery box body meets the requirements, airtightness detection is usually carried out before the box body leaves the factory and before the battery pack is assembled.

[0003] In the stage of airtightness detection before the box body leaves the factory, the manufacturer of the battery box body usually conducts airtightness testing on the lower box body. During the test, the lower box body is inverted on a specially designed airtight tooling (such as an airtight tooling for quickly and efficiently detecting the battery box body of a new energy vehicle disclosed in CN217505121U). A filling block is placed in the enclosed space formed between the lower box body and the tooling. The filling block is used to simulate the volume of the module in the battery pack to ensure that the cavity volume is consistent with the detection state of the battery pack. During the test, the filling block does not contact the module mounting surface of the box body. Therefore, during the test, the module mounting surface is in an unloaded state.

[0004] In the stage of airtightness detection before the battery pack leaves the factory, when all the battery modules and other internal components are assembled, the box cover is installed in place to form a complete battery pack. At this time, the entire system will conduct a second airtightness detection. Different from the previous test, at this time, the bottom of the lower box body is in a state of bearing the gravity of the module, and this stress condition will affect the result of the airtightness test.

[0005] In the above two detection stages, the stress state of the box bottom is different. Therefore, it is easy to cause the problem that the products that are qualified in the early stage do not meet the airtightness standard after being assembled into a complete battery pack in the subsequent stage. It wastes manpower and material resources during the subsequent rework. To solve the above technical problems, it is necessary to provide an airtightness detection structure for a battery box body. Content of the Utility Model

[0006] In view of this, the utility model provides an airtightness detection structure for a battery box body. By setting the top elastic force of the compression foam to abut against the bottom of the lower box body to simulate the pressure of the module on the bottom of the box body during the battery pack detection, it is convenient to achieve the consistency of the airtightness measurement state of the lower box body and the airtightness measurement state of the battery pack through the simulated pressure. Furthermore, it is convenient for the manufacturer of the lower box body to find the unqualified products that may appear in the subsequent battery pack test stage during the product factory inspection stage, effectively reducing the number of product reworks and saving manpower and material resources.

[0007] The technical solution of the utility model is realized as follows:

[0008] The utility model provides an airtight detection structure for a battery box body, which includes a lower box body, an airtightness detection tooling and a filling block. Among them,

[0009] The lower box body is reversely buckled and detachably arranged on the airtightness detection tooling;

[0010] The filling block is arranged inside the lower box body and placed on the airtightness detection tooling;

[0011] It also includes a compression foam. Among them,

[0012] The compression foam is arranged on the top of the filling block, and the top of the compression foam elastically abuts against the bottom of the lower box body to simulate the pressure of the module on the bottom of the box during the detection of the battery pack.

[0013] On the basis of the above technical solutions, preferably, at least one filling block is provided, and one compression foam is arranged on each filling block.

[0014] On the basis of the above technical solutions, preferably, both the filling block and the compression foam are rectangular plate-like structures.

[0015] On the basis of the above technical solutions, preferably, the compression foam is detachably arranged on the top of the filling block.

[0016] On the basis of the above technical solutions, preferably, the compression foam is fixed on the top of the filling block.

[0017] On the basis of the above technical solutions, preferably, the airtightness detection tooling includes an inflation platform and a clamp. Among them,

[0018] The lower box body and the filling block are placed on the inflation platform;

[0019] One end of the clamp is fixed on the inflation platform, and the other end clamps and fixes the lower box body on the inflation platform.

[0020] On the basis of the above technical solutions, preferably, an inflation port is arranged on the inflation platform.

[0021] On the basis of the above technical solutions, preferably, it also includes a sealing ring. Among them,

[0022] The sealing ring is clamped between the lower box body and the inflation platform.

[0023] On the basis of the above technical solutions, preferably, the sealing ring is fixed on the inflation platform.

[0024] On the basis of the above technical solutions, preferably, the sealing ring is fixed on the opening of the lower box body.

[0025] The airtight detection structure of a battery box body of the present utility model has the following beneficial effects compared with the prior art:

[0026] (1) By arranging the top elastic force of the compression foam to abut against the bottom of the lower box body to simulate the pressure of the module on the bottom of the box body during the battery pack detection, it is convenient to make the airtightness measurement state of the lower box body consistent with the airtightness measurement state of the battery pack through the simulated pressure, so as to facilitate the lower box body manufacturer to find unqualified products that may appear in the subsequent battery pack test stage during the product factory inspection stage, effectively reducing the number of product reworks and saving manpower and material resources. Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0028] Figure 1 It is the front view of an airtight detection structure of a battery box body of the present utility model;

[0029] Figure 2 It is the sectional view taken along the line A-A of the present utility model;

[0030] Figure 3 It is the partial exploded view of the present utility model;

[0031] In the figure: 1, lower box body; 2, airtightness detection tooling; 3, filling block; 4, compression foam; 5, sealing ring; 21, inflation platform; 22, clamp; 201, inflation port. Detailed Embodiments

[0032] The following will clearly and completely describe the technical solutions in the present utility model in conjunction with the specific embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present utility model.

[0033] As Figures 1-3 shown, an airtight detection structure of a battery box body of the present utility model includes a lower box body 1, an airtightness detection tooling 2, a filling block 3, and a compression foam 4.

[0034] Among them, the lower box body 1 is reversely buckled and detachably arranged on the airtightness detection tooling 2; the filling block 3 is arranged inside the lower box body 1 and placed on the airtightness detection tooling 2; the compressed foam 4 is arranged on the top of the filling block 3, and the top of the compressed foam 4 elastically abuts against the bottom of the lower box body 1 to simulate the pressure of the module on the bottom of the box during the battery pack detection. When performing the airtightness test, the airtightness measurement state at this stage and the subsequent airtightness measurement state of the battery pack are made consistent through the simulated pressure, so as to facilitate the manufacturer of the lower box body 1 to detect unqualified products that may occur in the subsequent battery pack test stage during the product factory inspection stage, effectively reducing the number of product reworks and saving manpower and material resources.

[0035] As Figure 3 shown, in this battery box body airtightness detection structure, both the filling block 3 and the compressed foam 4 are rectangular plate-like structures, and at least one filling block 3 is provided, and one compressed foam 4 is provided on each filling block 3. Among them, the compressed foam 4 is installed on the top of the filling block 3 by using a magic tape fixing method, which is convenient for disassembly and has good convenience. It can also be fixed on the top of the filling block 3 by using structural adhesive.

[0036] As Figure 1 shown, the airtightness detection tooling 2 includes an inflation platform 21 and a clamp 22. Among them, as Figure 2 shown, the inflation platform 21 is used to place the lower box body 1 and the filling block 3, and an inflation port 201 is also provided on the inflation platform 21 for inflating into the lower box body 1.

[0037] As Figure 1 shown, the clamp 22 adopts a pneumatic clamp structure, one end of which is fixed on the inflation platform 21, and the other end is used to clamp and fix the lower box body 1 on the inflation platform 21.

[0038] As Figure 2 shown, the above battery box body airtightness detection structure further includes a sealing ring 5. Among them, the sealing ring 5 is clamped between the lower box body 1 and the inflation platform 21, and the gap between the lower box body 1 and the inflation platform 21 is sealed through the sealing ring 5. The sealing ring 5 can be fixedly connected to the inflation platform 21 or can be fixedly connected to the box opening of the lower box body 1.

[0039] In addition, the airtightness detection tooling 2 can also adopt any one of the existing airtight toolings, such as an airtight tooling for quickly and efficiently detecting the battery box body of a new energy vehicle disclosed in CN217505121U. When using the existing airtight tooling, the lower box body 1 is reversely buckled on the BASE board of the airtight tooling, and then the lower box body 1 is fixed through the clamping mechanism on the airtight tooling.

[0040] In the above structure, the filling block 3 is used to simulate the volume of the module in the battery pack to ensure that the cavity volume in the lower box body 1 is consistent with the battery pack detection state.

[0041] To ensure that the compression foam 4 in the airtight detection structure of the battery box can accurately simulate the pressure of the module on the bottom of the battery pack, it is necessary to calculate the relationship between the resilience of the compression foam 4 and the weight of the module. The steps are as follows:

[0042] S1. Calculate the average pressure of the module on the bottom of the box: Divide the total weight of the module by the bottom area of the module to obtain the average pressure P of the module on the bottom of the box.

[0043] S2. Select a suitable foam type according to the physical properties of the compression foam 4. Generally, the resilience of the foam is proportional to its compression amount. Based on the required resilience, calculate the thickness of the compression foam 4. When calculating, consider the resilience coefficient of the foam. Assume that the initial thickness of the foam is d0, and the compression amount under the action of pressure O is Δd. Then the thickness d of the foam is d = d0 + Δd, where Δd = (d0 - d1) / d0 * 100%, and d1 is the thickness of the foam after compression.

[0044] The usage method of an airtight detection structure of a battery box of the present utility model is as follows:

[0045] Before testing, place the filling block 3 on the inflation platform 21, then install the compression foam 4 on the top of the filling block 3, then invert the lower box body 1 on the inflation platform 21, and make the filling block 3 and the compression foam 4 inside the lower box body 1. Fix the lower box body 1 through the clamp 22. After fixing, the top of the compression foam 4 abuts against the bottom of the lower box body 1. During testing, inflate into the lower box body 1 through the inflation port 201.

[0046] The above is only the preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A battery box airtightness detection structure, comprising a lower box (1), an airtightness detection tool (2) and a filling block (3), wherein: The lower box body (1) is inverted and detachably arranged on the air tightness detection tooling (2); The filling block (3) is arranged inside the lower box (1) and is placed on the airtightness detection tooling (2); It is characterized in that it also includes compressed foam (4), wherein: The compressed foam (4) is arranged on the top of the filling block (3), and the elastic force of the top of the compressed foam (4) presses against the bottom of the lower box (1) to simulate the pressure of the module on the bottom of the box during battery pack testing.

2. A battery box airtightness detection structure as claimed in claim 1, characterized in that: At least one filling block (3) is provided, and a piece of the compressed foam (4) is provided on each filling block (3).

3. A battery box airtightness detection structure as claimed in claim 2, characterized in that: The filling block (3) and the compressed foam (4) are both rectangular plate-shaped structures.

4. A battery box airtightness detection structure as claimed in claim 3, characterized in that: The compressed foam (4) is detachably arranged on the top of the filling block (3).

5. A battery box airtightness detection structure as claimed in claim 3, characterized in that: The compressed foam (4) is fixed on the top of the filling block (3).

6. A battery box airtightness detection structure as claimed in claim 4 or 5, characterized in that: The air tightness testing tool (2) comprises an air-filling platform (21) and a clamp (22), wherein: The lower box (1) and the filling block (3) are placed on the inflation platform (21); One end of the clamp (22) is fixed on the inflation platform (21), and the other end clamps and fixes the lower box (1) on the inflation platform (21).

7. A battery box airtightness detection structure as claimed in claim 6, characterized in that: The inflation platform (21) is provided with an inflation port (201).

8. A battery box airtightness detection structure as claimed in claim 7, characterized in that: It also includes a sealing ring (5), wherein: The sealing ring (5) is clamped between the lower box (1) and the inflation platform (21).

9. A battery box airtightness detection structure as claimed in claim 8, characterized in that: The sealing ring (5) is fixed on the inflation platform (21).

10. A battery box airtightness detection structure as claimed in claim 8, characterized in that: The sealing ring (5) is fixed on the box opening of the lower box body (1).

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