Internal cavity sealing structure of battery system

Abstract

The present invention relates to the technical field of battery systems, and discloses a battery system internal cavity sealing structure, which comprises a box body, the inner surface of the box body is fixedly provided with a separation plate, the inner surface of the box body is fixedly provided with a sealing mechanism, and the sealing mechanism further comprises a first sealing cover; the sealing mechanism comprises a lifter, and the bottom of the lifter is fixedly connected with the inner surface of the box body. According to the internal cavity sealing structure of the battery system, the battery cell is placed and fixed in the box body, then the wire harness penetrates through the sealing sleeve and is filled with the fixing block, the fixing block is sealed by the sealing sleeve when being hardened, and then the box body is covered with the first sealing cover; then a user fixes a lifting rod of the lifter penetrating through the first sealing cover to the tension cap, the lifter is started to move the lifting rod downwards, the tension cap moves downwards, the tension cap drives the first sealing cover to be tightly fixed to the box body, and then the second sealing cover is fixed to the box body through bolts and nuts.

Description

Technical Field

[0001] The present invention relates to the technical field of battery systems, and in particular to a battery system internal cavity sealing structure. Background Art

[0002] The battery box is a group of battery boxes consisting of several single battery boxes, box bodies, battery box management systems and related installation structures (equipment). It has a standard battery box structure, battery box monitoring equipment, battery box connectors, battery box environmental control equipment, etc.

[0003] The sealing and waterproofing of power battery box housings are crucial for protecting the insulation of the internal battery box modules and power system. Due to the demand for lightweight vehicles, power battery box housings are relatively thin, with the wall thickness of the housing sealing surface generally less than 5mm. Bolt fasteners are generally smaller than M10, with M5 bolts being the most common.

[0004] The flange surface of the lower shell (or upper shell) of the existing power battery box is coated with a formed-in-place curing sealant. This sealant can be a single-component moisture-curing sealant or a two-component A / B reaction-curing sealant. Before the formed-in-place sealant cures, the upper and lower shells are assembled, and the upper shell is pressed against the lower shell and fastened with bolts. When the sealant cures, a chemical bonding gasket (Cure in Place Gasket, CIPG) is formed. The CIPG forms a bond between the flange surfaces of the upper and lower shells. The thickness of the CIPG is generally 0.1mm to 3mm, and it is tightened and clamped with bolt fasteners to achieve sealing.

[0005] In order to achieve the sealing effect, CIPG is required to have a very high bonding strength, generally greater than 1MPa. The technical deficiency is that when the flange seal established by the CIPG method is disassembled and repaired, the destructive force must be greater than the bonding strength of CIPG, resulting in structural deformation of the shell flange caused by disassembly damage and cannot be resealed or repaired multiple times. Summary of the Invention

[0006] In view of the above-mentioned existing problem that when the battery box needs to be repaired, the disassembly of the battery box sealing structure will damage the structure of the shell flange, resulting in the battery box being unable to be sealed again and requiring multiple repairs, the present invention is proposed.

[0007] Therefore, the purpose of the present invention is to provide a battery system internal cavity sealing structure, the purpose of which is: the battery box seals the electronic components and battery cells separately, and the sealing effect is consistent with the CIPG sealing method, and at the same time can be disassembled without damage, so that it can be disassembled and repaired multiple times.

[0008] To solve the above technical problems, the present invention provides the following technical solutions: a battery system internal cavity sealing structure, comprising a box body, a partition plate fixedly mounted on the inner surface of the box body, and a sealing mechanism fixedly mounted on the inner surface of the box body;

[0009] The sealing mechanism includes a lifter, and the bottom of the lifter is fixedly connected to the inner surface of the box.

[0010] As a preferred solution for the internal cavity sealing structure of the battery system described in the present invention, the sealing mechanism further includes a No. 1 sealing cover, the bottom of which is fixedly connected to the top of the box body by bolts and nuts, and the top of the lifting rod of the lifter passes through the No. 1 sealing cover and extends to the outside of the No. 1 sealing cover.

[0011] As a preferred solution for the internal cavity sealing structure of the battery system described in the present invention, the sealing mechanism further includes a tension cap, the inner surface of the tension cap is threadedly connected to the outer surface of the lifting rod of the lifter, and a No. 1 sealing ring is fixedly installed on the bottom of the tension cap.

[0012] As a preferred solution of the internal cavity sealing structure of the battery system described in the present invention, the sealing mechanism further includes a No. 1 sealing groove, which is opened on the top of the No. 1 sealing cover, and the inner surface of the No. 1 sealing groove is snap-connected with the outer surface of the No. 1 sealing ring.

[0013] As a preferred solution of the internal cavity sealing structure of the battery system described in the present invention, the sealing mechanism further includes a wire harness sealing assembly, the wire harness sealing assembly includes a wire harness hole, the wire harness hole is opened on the outer surface of the partition plate, and the inner surface of the wire harness hole is provided with a No. 2 sealing groove.

[0014] As a preferred solution for the internal cavity sealing structure of the battery system described in the present invention, the wiring harness sealing assembly includes a sealing sleeve, the outer surface of the sealing sleeve is snap-fitted to the inner surface of the wiring harness hole, and a No. 2 sealing ring is fixedly installed on the outer surface of the sealing sleeve, and the outer surface of the No. 2 sealing ring is snap-fitted to the inner surface of the No. 2 sealing groove.

[0015] As a preferred solution for the internal cavity sealing structure of the battery system described in the present invention, a fixed block is fixedly installed on the inner surface of the wiring harness sealing assembly, a control wiring harness is fixedly installed on the inner surface of the fixed block, and the right end of the control wiring harness is fixedly connected to the outer surface of the lifter.

[0016] As a preferred solution of the internal cavity sealing structure of the battery system of the present invention, the sealing mechanism further includes a No. 2 sealing cover, the bottom of which is fixedly connected to the top of the box body by bolts and nuts.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects:

[0018] 1. The present invention adds a design for non-destructive and quick disassembly and installation of the battery box. Through the coordinated use of the lifter and the tension cap with the No. 1 sealing cover and the box body, the coordinated use of the box body and the partition plate with the No. 1 sealing cover, and the coordinated use of the tension cap with the No. 1 sealing ring and the No. 1 sealing groove and the No. 1 sealing cover, the sealing material is deformed by the extrusion force, so that the sealing effect in the wet cavity of the battery box is consistent with that of the CIPG sealing method. At the same time, when disassembly and maintenance are required, there is no need to destructively open the battery box, so that the battery box can be disassembled and resealed multiple times.

[0019] 2. The present invention adds a design for detachable sealing and fixing of the battery wiring harness. By using the separation plate and the wiring harness hole in conjunction with the No. 2 sealing groove and the sealing sleeve, and the sealing sleeve and the No. 2 sealing ring in conjunction with the fixing block and the control wiring harness, all wiring harnesses in the wet cavity can be sealed into the dry cavity. At the same time, when maintenance and replacement are required, the sealing sleeve can be removed and the control wiring harness can be removed by destroying the fixing block. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of the internal cavity sealing structure of the battery system of the present invention;

[0021] Figure 2 This is a schematic diagram of the three-dimensional structure of the box body of the internal cavity sealing structure of the battery system of the present invention;

[0022] Figure 3 Schematic diagram of the partial explosion structure of the No. 1 sealing cover, the tension cap, the No. 1 sealing ring and the No. 1 sealing groove of the internal cavity sealing structure of the battery system of the present invention;

[0023] Figure 4 This is a schematic diagram of a partial three-dimensional cross-sectional structure of the wiring harness sealing assembly of the internal cavity sealing structure of the battery system of the present invention.

[0024] Description of reference numerals:

[0025] 1. Box body; 2. Partition plate; 3. Sealing mechanism; 31. Lifter; 32. Sealing cover No. 1; 33. Tension cap; 34. Sealing ring No. 1; 35. Sealing groove No. 1; 36. Wiring harness sealing assembly; 361. Wiring harness hole; 362. Sealing groove No. 2; 363. Sealing sleeve; 364. Sealing ring No. 2; 365. Fixing block; 366. Control wiring harness; 37. Sealing cover No. 2. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0027] Example 1

[0028] Reference Figure 1-Figure 3 , which is the first embodiment of the present invention, provides a battery system internal cavity sealing structure, the battery system internal cavity sealing structure includes a box body 1, a partition plate 2 is fixedly mounted on the inner surface of the box body 1, and a sealing mechanism 3 is fixedly mounted on the inner surface of the box body 1;

[0029] The sealing mechanism 3 includes a lifter 31 , the bottom of which is fixedly connected to the inner surface of the box body 1 .

[0030] The sealing mechanism 3 also includes a No. 1 sealing cover 32, the bottom of which is fixedly connected to the top of the box body 1 through bolts and nuts, and the top of the lifting rod of the lifter 31 passes through the No. 1 sealing cover 32 and extends to the outside of the No. 1 sealing cover 32.

[0031] The upgrader 31 consists of a power source (motor / hydraulic pump), a transmission mechanism (gear / hydraulic cylinder), a support structure (guide rail / lifting rod) and a control system (switch / limiter). The top of the lifting rod can be threadedly connected to the tension cap 33.

[0032] The sealing mechanism 3 further includes a tension cap 33 , the inner surface of the tension cap 33 is threadedly connected to the outer surface of the lifting rod of the lifter 31 , and a No. 1 sealing ring 34 is fixedly mounted on the bottom of the tension cap 33 .

[0033] The sealing mechanism 3 further includes a No. 1 sealing groove 35 , which is opened on the top of the No. 1 sealing cover 32 . The inner surface of the No. 1 sealing groove 35 is engaged with the outer surface of the No. 1 sealing ring 34 .

[0034] During use, the partition plate 2 divides the battery box into dry and wet areas, and then the No. 1 sealing cover 32 is tightly fitted to the box body 1 through the cooperation of the lifter 31, the tension cap 33 and the No. 1 sealing ring 34. The sealing material is deformed and fits tightly to the contact surface through the extrusion force, thereby filling the microscopic gaps, increasing the contact area, forming a sealing interface pressure higher than the medium pressure, and finally blocking the leakage.

[0035] Example 2

[0036] Reference Figure 2 and Figure 4 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that: the sealing mechanism 3 also includes a wire harness sealing component 36, the wire harness sealing component 36 includes a wire harness hole 361, the wire harness hole 361 is opened on the outer surface of the partition plate 2, and the inner surface of the wire harness hole 361 is provided with a No. 2 sealing groove 362.

[0037] The wiring harness sealing assembly 36 includes a sealing sleeve 363, the outer surface of which is snap-fitted to the inner surface of the wiring harness hole 361, and a No. 2 sealing ring 364 is fixedly installed on the outer surface of the sealing sleeve 363, and the outer surface of the No. 2 sealing ring 364 is snap-fitted to the inner surface of the No. 2 sealing groove 362.

[0038] A fixing block 365 is fixedly mounted on the inner surface of the harness sealing assembly 36 , a control harness 366 is fixedly mounted on the inner surface of the fixing block 365 , and a right end of the control harness 366 is fixedly connected to the outer surface of the lifter 31 .

[0039] The fixing block 365 is an epoxy resin potting agent, which is extrudable and shapeable, and is hard and flame-retardant after curing, and has high compressive strength.

[0040] The sealing mechanism 3 further includes a No. 2 sealing cover 37 , the bottom of which is fixedly connected to the top of the box body 1 via bolts and nuts.

[0041] During use, through the coordination of the partition plate 2 and the harness hole 361 with the sealing sleeve 363 and the No. 2 sealing groove 362, and the coordination of the sealing sleeve 363 and the No. 2 sealing ring 364 with the fixing block 365 and the control harness 366, all the harnesses in the wet cavity can be sealed and enter the dry cavity. At the same time, when maintenance and replacement are required, the sealing sleeve 363 can be removed, and the control harness 366 can be removed by destroying the fixing block 365.

[0042] The remaining structures are the same as those of Example 1.

[0043] Based on Examples 1-4, the working principle of the present invention is as follows: the user first places and fixes the battery cell inside the box body 1, then passes the wiring harness through the sealing sleeve 363 and fills it with the fixing block 365. When the fixing block 365 hardens, the sealing sleeve 363 seals it, and then covers the No. 1 sealing cover 32 on the box body 1. Then, the user fixes the lifting rod of the lifter 31 passing through the No. 1 sealing cover 32 to the tension cap 33. The lifter 31 is started to move the lifting rod downward, so that the tension cap 33 moves downward, and the tension cap 33 drives the No. 1 sealing cover 32 to be tightly fixed to the box body 1, and then the No. 2 sealing cover 37 is fixed to the box body 1 with bolts and nuts.

[0044] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A battery system internal cavity sealing structure, comprising a box (1), characterized in that: A partition plate (2) is fixedly mounted on the inner surface of the box body (1), and a sealing mechanism (3) is fixedly mounted on the inner surface of the box body (1); The sealing mechanism (3) comprises a lifter (31), the bottom of which is fixedly connected to the inner surface of the box body (1).

2. The battery system internal cavity sealing structure according to claim 1, characterized in that: The sealing mechanism (3) further comprises a No. 1 sealing cover (32), the bottom of which is fixedly connected to the top of the box body (1) via bolts and nuts, and the top end of the lifting rod of the lifter (31) passes through the No. 1 sealing cover (32) and extends to the outside of the No. 1 sealing cover (32).

3. The battery system internal cavity sealing structure according to claim 1, characterized in that: The sealing mechanism (3) further comprises a tension cap (33), the inner surface of the tension cap (33) being threadedly connected to the outer surface of the lifting rod of the lifter (31), and a No. 1 sealing ring (34) being fixedly mounted on the bottom of the tension cap (33).

4. The battery system internal cavity sealing structure according to claim 1, characterized in that: The sealing mechanism (3) further comprises a No. 1 sealing groove (35), which is opened on the top of the No. 1 sealing cover (32), and the inner surface of the No. 1 sealing groove (35) is engaged with the outer surface of the No. 1 sealing ring (34).

5. The battery system internal cavity sealing structure according to claim 1, characterized in that: The sealing mechanism (3) further comprises a wire harness sealing assembly (36), wherein the wire harness sealing assembly (36) comprises a wire harness hole (361), wherein the wire harness hole (361) is provided on the outer surface of the partition plate (2), and a second sealing groove (362) is provided on the inner surface of the wire harness hole (361).

6. The battery system internal cavity sealing structure according to claim 5, characterized in that: The wiring harness sealing assembly (36) includes a sealing sleeve (363), the outer surface of which is snap-fitted to the inner surface of the wiring harness hole (361), a No. 2 sealing ring (364) fixedly mounted on the outer surface of the sealing sleeve (363), and the outer surface of the No. 2 sealing ring (364) is snap-fitted to the inner surface of the No. 2 sealing groove (362).

7. The battery system internal cavity sealing structure according to claim 5, characterized in that: A fixing block (365) is fixedly mounted on the inner surface of the harness sealing assembly (36), a control harness (366) is fixedly mounted on the inner surface of the fixing block (365), and the right end of the control harness (366) is fixedly connected to the outer surface of the lifter (31).

8. The battery system internal cavity sealing structure according to claim 1, characterized in that: The sealing mechanism (3) further comprises a No. 2 sealing cover (37), the bottom of which is fixedly connected to the top of the box body (1) via bolts and nuts.

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