Feed-through member and battery pack

Abstract

A feed-through member and a battery pack. The feed-through member is axially provided with a wiring through-hole for a wiring harness to pass through, and the wiring through-hole is sealed and filled with an adhesive. The feed-through member comprises a blocking part and a plug-in part. The blocking part is configured to be inserted into a feed-through hole of a casing of the battery pack. The blocking part protrudes on a first end of the plug-in part in the axial direction, and an end surface of the first end is provided with an adhesive-applied region arranged circumferentially around the blocking part. The adhesive-applied region is coated with an adhesive, so that the end surface of the first end is sealed and adhered to a wall plate of the casing having the feed-through hole. The battery pack comprises the feed-through member, the blocking part of the feed-through member being inserted into the feed-through hole of the casing of the battery pack, and the first end of the plug-in part being sealed and adhered to the wall plate of the casing having the feed-through hole by means of the adhesive in the adhesive-applied region, thereby achieving sealing installation of the feed-through member in the casing. Furthermore, the wiring through-hole is sealed and filled with an adhesive, thereby achieving sealed installation of the wiring harness in the feed-through member and improving the sealing performance and protection level of the battery pack.

Description

Piercing member and battery pack

[0001] The present application claims priority to the Chinese patent application No. 202421179760.9, filed on May 27, 2024, to the Chinese Patent Office, the whole content of the above application being incorporated herein by reference.

[0002] TECHNICAL FIELD

[0003] The present application relates to the technical field of batteries, for example to a kind of piercing member and battery pack.

[0004] BACKGROUND

[0005] In the immersed battery pack, cooling medium is arranged in the box of the battery pack, and the battery cell is immersed in the cooling medium to exchange heat with the battery cell to cool the battery cell.

[0006] In the process of thermal runaway test of the immersed battery pack, the thermocouple is built in the battery cell inside the box, and the thermocouple wire needs to be led out from the box to transmit the collected battery cell temperature change to the test platform.In the immersed battery pack in the related art, a cabin hole needs to be punched on the box to meet the piercing requirement of the thermocouple wire.There may be a gap between the thermocouple wire and the piercing hole, which reduces the sealing performance of the box, and it is difficult to meet the protection level required by the box of the battery pack.

[0007] TECHNICAL PROBLEM

[0008] The present application provides a kind of piercing member and battery pack, which can improve the poor sealing performance of the box of the battery pack in the related art when the box is pierced.

[0009] TECHNICAL SOLUTION

[0010] In a first aspect, the embodiments of the present application provide a piercing member, the piercing member is provided with a wire hole for wire harness along the axial direction, and the wire hole is filled with a colloid; the piercing member includes a plugging part and a plug-in part, the plugging part is arranged in the piercing hole of the box of the battery pack, the first end of the plug-in part is provided with the plugging part, and the end face of the first end is provided with a glue coating area around the plugging part, and the glue coating area is coated with the colloid to make the end face of the first end seal and fit on the wall plate of the box with the piercing hole.

[0011] In a second aspect, the embodiments of the present application provide a battery pack including the above-mentioned piercing member.

[0012] ADVANTAGEOUS EFFECTS

[0013] The present application has the following advantages:

[0014] The plug-in part of the cabin-penetrating piece is provided with a glue coating area, so that the first end of the plug-in part can be sealed and fitted on the wall plate of the box body having the cabin-penetrating hole, and the sealed installation of the cabin-penetrating piece on the box body is realized. Meanwhile, the wire harness in the box body penetrates through the wire penetrating hole of the cabin-penetrating piece, and the wire penetrating hole is sealed and filled with glue, so as to fix the wire harness by the glue and seal and block the wire penetrating hole, realize the sealed installation of the wire harness on the cabin-penetrating piece, avoid the gap between the wire harness and the cabin-penetrating hole, and improve the sealing performance and protection level of the box body.

[0015] The battery pack provided in the application includes the above-mentioned cabin-penetrating piece. By installing the cabin-penetrating piece in the cabin-penetrating hole of the box body, the wire harness is sealed and installed with the box body through the cabin-penetrating piece, the cabin-penetrating requirement of the wire harness is met, and the sealing performance and protection level of the battery pack are improved.

[0016] BRIEF DESCRIPTION OF DRAWINGS

[0017] FIG. 1 is a partial structure schematic view of a battery pack provided by an embodiment of the application;

[0018] FIG. 2 is a longitudinal sectional view of a cabin-penetrating piece provided by an embodiment of the application;

[0019] FIG. 3 is a structure schematic view one of a cabin-penetrating piece provided by an embodiment of the application;

[0020] FIG. 4 is a structure schematic view two of a cabin-penetrating piece provided by an embodiment of the application.

[0021] Component names and labels in the figure are as follows:

[0022] 100, box body; 101, wall plate; 102, cabin-penetrating hole; 200, wire harness;

[0023] 1, cabin-penetrating piece; 10, wire penetrating hole; 11, plugging part; 111, first glue overflow groove; 12, plug-in part; 121, glue coating area; 122, second glue overflow groove; 123, third glue overflow groove.

[0024] Embodiment of the application

[0025] The technical solution of the application will be further described below by combining with the drawings and through specific embodiments.

[0026] The battery pack provided in the embodiment can be applied to power storage systems, new energy vehicles and other power consumption scenarios. As shown in FIG. 1, the battery pack of the embodiment can be an immersion type battery pack, which includes a box body 100, battery cells and thermocouples, etc. The box body 100 is provided with a cooling medium, and the battery cells are immersed in the cooling medium to exchange heat with the cooling medium and achieve cooling of the battery cells. The battery pack of the embodiment can also be a non-immersion type battery pack, which is not specifically limited here.

[0027] During the battery pack thermal runaway test process, a thermocouple is built into the box 100 and used to measure the temperature change of the battery cell after thermal runaway. The thermocouple wire needs to be led out from the box 100 to transmit the collected battery temperature change to the test platform. In the related art immersion battery pack, a cabin hole needs to be punched on the box to meet the cabin penetration requirement of the thermocouple wire. There may be a gap between the thermocouple wire and the cabin hole, which destroys the sealing of the box and makes it difficult to achieve the high protection level required by the battery pack.

[0028] To improve the above situation, as shown in FIGS. 1-3, the present embodiment also proposes a cabin penetrating piece 1 applied to the above-mentioned immersion battery pack during the thermal runaway test process. The cabin penetrating piece 1 can also be applied to other assembly operations that need to be routed through the cabin. The cabin penetrating piece 1 is provided with a threading hole 10 for the wire harness 200 to pass through along the axial direction, and the threading hole 10 is sealed and filled with glue. The cabin penetrating piece 1 includes a plugging part 11 and a plug-in part 12, the plugging part 11 can be arranged in the cabin hole 102 of the box 100 of the battery pack, and the first end of the plug-in part 12 protrudes the plugging part 11 along the axial direction, and the end face of the first end has a glue coating area 121 arranged circumferentially around the plugging part 11, and the glue coating area 121 is coated with glue to make the end face of the first end of the plug-in part 12 sealingly fit on the wall plate 101 of the box 100 having the cabin hole 102. By arranging the plugging part 11 of the cabin penetrating piece 1 in the cabin hole 102 of the box 100 of the battery pack, the glue coating area 121 of the first end of the plug-in part 12 of the cabin penetrating piece 1 is coated with glue, so that the first end of the plug-in part 12 is sealingly fit on the wall plate 101 of the box 100 having the cabin hole 102, realizing the sealing installation of the cabin penetrating piece 1 on the box 100. At the same time, the wire harness 200 in the box 100 passes through the threading hole 10 of the cabin penetrating piece 1, and the threading hole 10 is sealed and filled with glue to fix the wire harness 200 and seal the threading hole 10, realizing the sealing installation of the wire harness 200 in the cabin penetrating piece 1 to avoid the gap between the wire harness 200 and the cabin hole 102, and improve the sealing performance and protection level of the box 100. The above-mentioned glue can be a structural adhesive, which has good adhesive performance and low cost.

[0029] In the present embodiment, the cabin penetrating piece 1 is a rubber piece with good elastic-plasticity, which is convenient for injection molding. The plugging part 11 and the plug-in part 12 are integrally formed by injection molding, which is simple and efficient. In other embodiments, the cabin penetrating piece 1 can also be made of other materials, which is not limited here. The cabin penetrating piece 1 is a stepped shaft structure, i.e. the plugging part 11 and the plug-in part 12 are cylindrical structures, and the diameter of the plugging part 11 is smaller than that of the plug-in part 12, so that the end face of the first end of the plug-in part 12 forms a stepped face of the cabin penetrating piece 1 to realize the positioning installation of the cabin penetrating piece 1, and the first end of the plug-in part 12 has the glue coating area 121.

[0030] The glue applying area 121 is annular due to the circumferential arrangement of the glue applying area 121 around the plugging part 11. The threading hole 10 is a circular hole coaxial with the plugging part 11, and the wire harness 200 is a thermocouple wire but is not limited thereto, and the thermocouple wire can be one or more. The cross-sectional area of the threading hole 10 is 1.3-1.5 times the cross-sectional area of the wire harness 200, so that the cross-sectional area of the threading hole 10 is 30%-50% larger than the cross-sectional area of the wire harness 200, to ensure that the wire harness 200 can smoothly pass through the threading hole 10, reduce the threading difficulty, and improve the threading efficiency. Moreover, the threading hole 10 has a suitable diameter, avoiding that the overall size of the cabin-penetrating piece 1 is too large. It should be noted that when the wire harness 200 has multiple wires, the cross-sectional area of the wire harness 200 refers to the sum of the cross-sectional areas of all the wires passing through the threading hole 10.

[0031] As shown in FIGS. 2 and 3, the first end of the plugging part 11 away from the plug-in part 12 is provided with a first glue overflow groove 111, and the first glue overflow groove 111 is in communication with one end of the threading hole 10. The first glue overflow groove 111 is arranged to store the excess glue in the threading hole 10, to avoid that the excess glue overflows to the outside of the cabin-penetrating piece 1 to cause pollution. As shown in FIGS. 2 and 4, the second end of the plug-in part 12 in the axial direction is provided with a second glue overflow groove 122, and the second glue overflow groove 122 is in communication with the other end of the threading hole 10. The second glue overflow groove 122 is also arranged to store the excess glue in the threading hole 10, to avoid that the excess glue overflows to the outside of the cabin-penetrating piece 1 to cause pollution. The cabin-penetrating piece 1 of the embodiment has the first glue overflow groove 111 and the second glue overflow groove 122 at the two axial ends, respectively, and the first glue overflow groove 111 and the second glue overflow groove 122 are in communication through the threading hole 10. In other embodiments, only the first glue overflow groove 111 can be arranged at the first end of the plugging part 11 away from the plug-in part 12, or only the second glue overflow groove 122 can be arranged at the second end of the plug-in part 12 in the axial direction.

[0032] As shown in FIGS. 2 and 3, the end face of the first end of the plug-in part 12 is circumferentially provided with a third glue overflow groove 123 around the plugging part 11, and the opening end of the third glue overflow groove 123 is in communication with the glue applying area 121. Specifically, the end face of the first end of the plug-in part 12 is concave to form the third glue overflow groove 123, and when the cabin-penetrating piece 1 is installed in the cabin-penetrating hole 102 of the box body 100, the end face of the first end of the plug-in part 12 is tightly attached to the wall plate 101 of the box body 100 having the cabin-penetrating hole 102, and the glue of the glue applying area 121 can enter the third glue overflow groove 123 after being extruded, to avoid that the excess glue overflows to the outside of the cabin-penetrating piece 1 to cause pollution.

[0033] In an optional embodiment, the axial length of the threading hole 10 is 20-40 mm. As shown in FIG. 2, the axial length L of the threading hole 10 can be 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, etc., so as to ensure that the length of the threading hole 10 is moderate. When the axial length L of the threading hole 10 is too small, the amount of colloid in the threading hole 10 is too small, and it is difficult to completely seal the threading hole 10, which cannot guarantee the sealing of the cabin-penetrating piece 1. When the axial length L of the threading hole 10 is too long, not only the amount of colloid used is increased, but also the overall length of the cabin-penetrating piece 1 is too long, which is not conducive to the miniaturization of the cabin-penetrating piece 1.

[0034] In an optional embodiment, the diameter D2 of the plugging part 11 is 3-8 times the diameter D1 of the threading hole 10, so that the end of the plugging part 11 away from the plug-in part 12 has sufficient end surface area, and the setting space of the first overflow groove 111 is reserved. The difference between the diameter D3 of the plug-in part 12 and the diameter D2 of the plugging part 11 is 30-80 mm, so that the first end of the plug-in part 12 has sufficient end surface area, and the setting space of the glue applying area 121 and the third overflow groove 123 is reserved. The difference between the outer diameter D4 of the glue applying area 121 and the inner diameter (i.e. the diameter D2 of the plugging part 11) of the glue applying area 121 is greater than 10 mm, so that the radial width of the glue applying area 121 is greater than 5 mm, which guarantees that the glue applying area 121 has sufficient glue applying area, improves the adhesion and tightness of the end surface of the first end of the plug-in part 12 and the wall plate 101 of the cabin-penetrating hole 102 of the cabinet 100, and thus improves the sealing of the cabin-penetrating piece 1 after being assembled to the cabinet 100.

[0035] The outer edge of the end of the plugging part 11 away from the plug-in part 12 is provided with a round corner. By rounding the outer edge of the end of the plugging part 11 away from the plug-in part 12, a guide circular arc surface is formed on the outer edge of the end of the plugging part 11 away from the plug-in part 12, so as to guide the plugging part 11 to be quickly inserted into the cabin-penetrating hole 102, which is conducive to improving the installation efficiency of the cabin-penetrating piece 1.

[0036] In the present embodiment, the outer edges of the first end and the second end of the plug-in part 12 in the axial direction are respectively provided with chamfers. The outer edges of the first end and the second end of the plug-in part 12 in the axial direction are respectively provided with right-angle structures, so as to remove burrs at the edges of the plug-in part 12 and improve the quality of the cabin-penetrating piece 1. At the same time, the right-angle structure is provided at the first end of the plug-in part 12 in the axial direction, which facilitates the picking and placing operation when the cabin-penetrating piece 1 is manually inserted and pulled out, so as to quickly install the cabin-penetrating piece 1 to the cabinet 100 or quickly pull out the cabin-penetrating piece 1 from the cabinet 100, which reduces the disassembly difficulty of the cabin-penetrating piece 1 and improves the disassembly efficiency of the cabin-penetrating piece 1.

Claims

1. A through-penetration member, wherein, The through-penetration piece (1) is provided with a wire hole (10) for the wire harness (200) to pass through in the axial direction, and the wire hole (10) is filled with a gel sealant. The through-penetration piece (1) comprises a blocking part (11) and a plug-in part (12), the blocking part (11) is arranged in the through-penetration hole (102) of the battery pack box (100), the first end of the plug-in part (12) in the axial direction protrudes the blocking part (11), and the end face of the first end is provided with a gel coating area (121) arranged circumferentially around the blocking part (11), and the gel coating area (121) is coated with the gel to make the end face of the first end seal and fit on the wall plate (101) of the box (100) with the through-penetration hole (102).

2. The cross-car element of claim 1, wherein, The through-penetration piece is arranged in at least one of the following manners: The end of the blocking part (11) away from the plug-in part (12) is provided with a first overflow groove (111) in communication with one end of the wire hole (10); and The second end of the plug-in part (12) in the axial direction is provided with a second overflow groove (122) in communication with the other end of the wire hole (10).

3. The cross-cabin element according to claim 1, wherein, The end face of the first end of the plug-in part (12) is provided with a third overflow groove (123) arranged circumferentially around the blocking part (11), and the opening end of the third overflow groove (123) is in communication with the gel coating area (121).

4. The cross-cabin element according to claim 1, wherein, The cross-sectional area of the wire hole (10) is 1.3-1.5 times the cross-sectional area of the wire harness (200).

5. The cross-car element of claim 1, wherein, The axial length of the wire hole (10) is 20-40 mm.

6. The tunneling member according to any one of claims 1 to 5, wherein The through-penetration piece (1) is a stepped shaft structure, the diameter of the blocking part (11) is smaller than the diameter of the plug-in part (12), and the gel coating area (121) is in the form of a circular ring.

7. The cross-car element of claim 6, wherein, The wire hole (10) is a circular hole coaxial with the blocking part (11), and the diameter of the blocking part (11) is 3-8 times the diameter of the wire hole (10).

8. The cross-car element of claim 7, wherein, The difference between the diameter of the plug-in part (12) and the diameter of the blocking part (11) is 30-80 mm.

9. The cross-car element of claim 6, wherein, The difference between the outer diameter of the gel coating area (121) and the inner diameter of the gel coating area (121) is greater than 10 mm.

10. A battery pack comprising the through-penetration piece according to any one of claims 1-9.

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