Battery pack upper cover structure and continuous glass fiber composite material battery

Abstract

The invention discloses a battery pack upper cover structure and a continuous glass fiber composite material battery, and relates to the technical field of vehicles, the battery pack upper cover structure comprises a cover body and a metal insert; a flange face is arranged on the cover body in a protruding mode towards the circumferential side along the joint, and a first installation hole is formed in the flange face in a penetrating mode. The metal insert is annularly arranged and is fixedly arranged in the first mounting hole; the metal insert comprises an inner end body and an outer end body which are arranged in a stepped mode in the thickness direction of the cover body. The inner end body is clamped on the end face of the inner side of the cover body, the upper end body protrudes out of the upper end face of the cover body, and the bolt is installed in the first installation hole from the annular hole of the metal insert. According to the technical scheme, the flange face is arranged at the joint of the cover body in the protruding mode, then the first installation hole is formed in the flange face in the penetrating mode, the metal insert is fixedly arranged in the first installation hole, the upper end body of the metal insert protrudes out of the upper end face of the cover body, and the bolt is installed in the first installation hole from the annular hole of the metal insert, so that the bolt does not make contact with the flange face; and therefore, the tightening force during bolt connection is not attenuated.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to a battery pack upper cover structure and a continuous glass fiber composite material battery. Background Art

[0002] At present, continuous glass fiber composite battery covers are increasingly used in electric vehicle battery packs due to their light weight, good insulation performance, corrosion resistance, and easy molding. However, since the battery cover is installed on the battery lower box with steel bolts, the tightening force of the fastening bolts is easily attenuated due to the brittleness and poor rigidity of the continuous glass fiber composite battery cover, and the bolts will loosen, thus affecting the sealing of the battery pack. Summary of the invention

[0003] The main purpose of the present invention is to propose a battery pack cover structure and a continuous glass fiber composite material battery, aiming to provide a battery pack cover structure and a continuous glass fiber composite material battery that can prevent the bolt tightening force from attenuating.

[0004] To achieve the above-mentioned purpose, the battery pack upper cover structure proposed in the present invention includes:

[0005] The cover body is provided with a flange surface protruding from the circumferential side along the joint, and a first mounting hole is penetrated on the flange surface; and

[0006] A metal insert is arranged in an annular shape and fixedly arranged in the first mounting hole; the metal insert comprises an inner end body and an outer end body, and is arranged in a stepped manner along the thickness direction of the cover body;

[0007] The inner end body is clamped on the inner end surface of the cover body, the upper end body protrudes from the upper end surface of the cover body, and the bolt is installed in the first installation hole through the annular hole of the metal insert.

[0008] In one embodiment, the battery pack upper cover structure further includes a sealing gasket attached to the inner end surface of the cover body;

[0009] The sealing gasket is provided with a second mounting hole corresponding to the first mounting hole, and the inner end body is located in the second mounting hole.

[0010] In one embodiment, a sealing structure is provided on the sealing gasket to prevent the battery pack upper cover structure from being waterproof after being assembled.

[0011] In one embodiment, the sealing structure includes a first rib, which is protruded from the sealing gasket in a direction away from the cover body and is arranged along an extension direction of the circumference of the cover body.

[0012] In one embodiment, the sealing structure further comprises:

[0013] A second rib protrudes from the sealing gasket in a direction away from the cover body and is arranged along an extending direction of a circumference of the cover body;

[0014] A sealed air chamber is formed between the first rib and the second rib.

[0015] In one embodiment, the metal insert and the sealing gasket are connected by bonding, wherein F≥7N / mm, and F is the bonding force.

[0016] In one embodiment, the sealing pad is made of foamed silicone foam.

[0017] In one embodiment, a plurality of limiting protrusions are convexly provided on the inner side of the cover body.

[0018] In one embodiment, the thickness of the flange surface is greater than the thickness of the cover body.

[0019] The present invention further provides a continuous glass fiber composite material battery. The continuous glass fiber composite material battery 200 includes a battery pack upper cover structure as described in any one of the above items.

[0020] The technical solution of the present invention is to convexly arrange the flange surface at the joint of the cover body, and then penetrate the first mounting hole on the flange surface, so that the metal insert is fixed in the first mounting hole, wherein the inner end body of the metal insert is clamped on the inner end surface of the cover body, and the upper end body protrudes from the upper end surface of the cover body, and the bolt is installed in the first mounting hole through the annular hole of the metal insert, so that the bolt does not contact the flange surface, thereby ensuring that the tightening force during bolt connection is not attenuated. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 the structures shown in these drawings without paying creative work.

[0022] Figure 1 A schematic structural diagram of an embodiment of a battery pack upper cover structure provided by the present invention;

[0023] Figure 2 for Figure 1 The internal section view at A in FIG.

[0024] Figure 3 for Figure 1 Schematic diagram of the structure of the metal insert at A;

[0025] Figure 4 for Figure 1 A schematic diagram of the structure of the cover body at A;

[0026] Figure 5 for Figure 1 Schematic diagram of the structure of the sealing gasket at A in FIG.

[0027] Description of Figure Numbers:

[0028] 100. Battery pack upper cover structure; 1. Cover body; 11. Flange surface; 111. First mounting hole; 12. Position limiting protrusion; 2. Metal insert; 21. Inner end body; 22. Outer end body; 3. Sealing pad; 31. Second mounting hole; 32. Sealing structure; 321. First rib; 322. Second rib; 333. Sealing air chamber;

[0029] 200. Continuous glass fiber composite battery.

[0030] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0033] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0034] At present, continuous glass fiber composite battery covers are increasingly used in electric vehicle battery packs due to their light weight, good insulation performance, corrosion resistance, and easy molding. However, since the battery cover is installed on the battery lower box with steel bolts, the tightening force of the fastening bolts is easily attenuated due to the brittleness and poor rigidity of the continuous glass fiber composite battery cover, and the bolts will loosen, thus affecting the sealing of the battery pack.

[0035] In order to solve the above problems, the present invention proposes a battery pack cover structure and a continuous glass fiber composite material battery, aiming to provide a battery pack cover structure and a continuous glass fiber composite material battery that prevent the bolt tightening force from attenuating. Figures 1 to 5 A schematic structural diagram of an embodiment of a battery pack cover structure provided by the present invention.

[0036] Please refer to Figures 1 to 5 In one embodiment of the present invention, the battery pack upper cover structure 100 includes a cover body 1 and a metal insert 2; the cover body 1 is provided with a flange surface 11 protruding from the circumferential side along the joint, and the flange surface 11 is penetrated with a first mounting hole 111; the metal insert 2 is arranged in an annular shape and fixed in the first mounting hole 111; the metal insert 2 includes an inner end body 21 and an outer end body 22, which are arranged in a stepped manner along the thickness direction of the cover body 1; wherein the inner end body 21 is clamped on the inner end surface of the cover body 1, and the upper end body is arranged to protrude from the upper end surface of the cover body 1, and the bolt is installed in the first mounting hole 111 through the annular hole of the metal insert 2.

[0037] The technical solution of the present invention is to convexly provide the flange surface 11 at the joint of the cover body 1, and then penetrate the first mounting hole 111 on the flange surface 11, so that the metal insert 2 is fixed in the first mounting hole 111, wherein the inner end body 21 of the metal insert 2 is clamped on the inner end surface of the cover body 1, and the upper end body protrudes from the upper end surface of the cover body 1, and the bolt is installed in the first mounting hole 111 through the annular hole of the metal insert 2, so that the bolt does not contact the flange surface 11, thereby ensuring that the tightening force during bolt connection is not attenuated.

[0038] It is understandable that the continuous glass fiber composite battery 200 upper cover is increasingly used in electric vehicle battery packs due to its light weight, good insulation performance, corrosion resistance, and easy molding. In some embodiments, the overall thickness of the cover 1 of the continuous glass fiber composite battery 200 upper cover is 1.2 mm. In order to meet the waterproof level requirements of the battery pack, the thickness of the flange surface 11 of the battery upper cover installed with the battery pack box is increased to 3 mm. The cover 1 is installed on the battery lower box with steel bolts. Since the continuous glass fiber composite battery upper cover is brittle and has poor rigidity, the tightening force of the fastening bolts is easily attenuated, and the bolts will loosen, affecting the sealing of the battery pack. In order to prevent the attenuation of the tightening force of the fastening bolts, the first mounting hole 111 is penetrated on the flange surface 11 of the cover 1 of the continuous glass fiber composite battery. The first mounting hole 111 is used to inlay the metal insert 2.

[0039] It can be understood that when the cover 1 of the continuous glass fiber composite material battery 200 is formed, since the metal insert 2 cannot be formed integrally with the mold, the first mounting hole 111 of the flange surface 11 of the cover 1 of the continuous glass fiber composite material battery 200 is formed by machining, and then the metal insert 2 is assembled to the first mounting hole 111 of the flange surface 11 of the cover 1 of the continuous glass fiber composite material battery 200. The metal insert 2 can be installed on the cover 1 of the continuous glass fiber composite material battery 200 by interference fit. The metal insert 2 is processed into a "C" shape. In this embodiment, it is fixed to the cover 1 of the continuous glass fiber composite material battery 200 by the expansion force of the metal insert 2.

[0040] It is understandable that due to the manufacturing tolerance of parts, after the cover body 1 of the continuous glass fiber composite material battery 200 is fastened to the lower battery box by bolts, there is a channel for water to enter the battery pack through the gap of the metal insert 2. In some embodiments, the sealing requirement can be met by increasing the sealing area on the inner side of the sealing foam, but this will cause the width of the flange surface 11 of the cover body 1 of the continuous glass fiber composite material battery 200 to increase significantly, thereby reducing the utilization rate of the idle battery space.

[0041] Furthermore, the cover body 1 of the continuous glass fiber composite material battery 200 has to withstand the rebound force of the sealing foam, and the metal insert 2 and the first mounting hole 111 of the cover body 1 of the continuous glass fiber composite material battery 200 are interference-fitted. A small interference fit may cause the metal insert 2 to move in the first mounting hole 111 of the cover body 1, thereby affecting the compression amount of the sealing foam. In severe cases, the battery pack seal may fail. It can be seen that very high requirements are placed on the dimensional accuracy, heat treatment and installation of the metal insert 2.

[0042] At the same time, the installation of the metal insert 2 also requires high precision of the opening of the cover 1 of the continuous glass fiber composite material battery 200, and requires the distance from the hole edge to the flange surface 111 to be greater than 5.5 mm. This setting is to ensure that the cover 1 of the continuous glass fiber composite material battery 200 has sufficient strength when assembled in the lower box of the battery pack, and is not easily damaged by external forces. At the same time, in order to ensure that the flange surface 111 has sufficient strength to cope with the influence of external forces after installation, not only the flange surface 111 of the cover 1 of the continuous glass fiber composite material battery 200 and the flange edge of the lower box are required to have a certain width, but also the position of the nut corresponding to the lower box is required, which will affect the design of the lower box and reduce the space utilization of the battery pack.

[0043] For further information, please refer to Figure 2 , Figure 4 and Figure 5The battery pack upper cover structure 100 also includes a sealing gasket 3 attached to the inner end surface of the cover body 1; the sealing gasket 3 is penetrated by a second mounting hole 31 corresponding to the first mounting hole 111, and the inner end body 21 is located in the second mounting hole 31. It can be understood that the tightening force during bolt connection does not decay in order to ensure the sealing of the cover body 1 after assembly. Therefore, in order to further enhance the sealing performance of the cover body 1 after assembly, the battery pack cover structure 100 also includes the sealing gasket 3, which is attached to the inner end face of the cover body 1; it can be understood that the metal insert 2 includes the inner end body 21 and the outer end body 22, wherein the inner end body 21 is protruding from the inner end face of the cover body 1, which will interfere with the installation of the sealing gasket 3 to a certain extent. Therefore, in order to better install the sealing gasket 3, the sealing gasket 3 is provided with the second mounting hole 31 at a position relative to the first mounting hole 111 to accommodate the inner end body 21, and thus there is no interference between the metal insert 2 and the sealing gasket 3 in the installation of the cover body 1, and the installation is tighter and more reliable, thereby further improving the sealing of the battery pack cover structure 100.

[0044] In addition, the sealing gasket 3 is provided with a sealing structure 32 to waterproof the battery pack cover structure 100 after being assembled. It is understandable that in some extreme cases, since the battery will heat up during use, the temperature of the cover body 1 will rise, and thus, it is easy to form condensed water when it comes into contact with the colder air outside. If the condensed water penetrates into the battery, it is very easy to cause equipment damage and danger. Condensed water is also most likely to enter at the joint of the cover body 1. Therefore, in order to further ensure the sealing of the cover body 1 after being assembled, the sealing gasket 3 is provided with the sealing structure 32 to waterproof the battery pack cover structure 100 after being assembled.

[0045] For further information, please refer to Figure 2 The sealing structure 32 includes a first rib 321, which is convexly arranged on the sealing gasket 3 in a direction away from the cover body 1 and is arranged along the extension direction of the circumference of the cover body 1. It can be understood that in order to further ensure the sealing performance of the cover body 1 after assembly, the sealing structure 32 is provided on the sealing gasket 3 to waterproof the battery pack upper cover structure 100 after assembly. Specifically, the sealing structure 32 includes the first rib 321, which is convexly arranged on the sealing gasket 3 in a direction away from the cover body 1 and is arranged along the extension direction of the circumference of the cover body 1. Therefore, when the cover body 1 is assembled, the first rib 321 can serve as a waterproof barrier to prevent the entry of condensed water, thereby ensuring the safe use of the battery.

[0046] For further information, please refer to Figure 2, the sealing structure 32 further includes a second rib 322 and a sealing air chamber 323: the second rib 322 is convexly arranged on the sealing gasket 3 in the direction away from the cover body 1, and is arranged along the extension direction of the circumference of the cover body 1; the sealing air chamber 323 is formed between the first rib 321 and the second rib 322. It can be understood that in order to further improve the sealing performance of the cover body 1 after assembly, specifically, the sealing structure 32 further includes the second rib 322 and the sealing air chamber 323: the second rib 322 is convexly arranged on the sealing gasket 3 in the direction away from the cover body 1, and is arranged along the extension direction of the circumference of the cover body 1; the sealing air chamber 323 is formed between the first rib 321 and the second rib 322; it can be understood that. The second rib 322 can serve as a second waterproof barrier. At the same time, the sealed air chamber 323 formed on the first rib 321 and the second rib 322 forms a sealed space after the cover body 1 is assembled. If external condensed water wants to enter, it needs to exchange volume with the air in the sealed air chamber 323. However, in the absence of a circulating air path, the closed air chamber will not exchange gas with the outside. At the same time, such a setting also simply blocks the entry of condensed water.

[0047] It can be understood that, as mentioned above, when the cover body 1 of the continuous glass fiber composite material battery 200 is molded, since the metal insert 2 cannot be integrally molded with the mold, the first mounting hole 111 of the flange surface 11 of the cover body 1 of the continuous glass fiber composite material battery 200 is formed by machining, and then the metal insert 2 is assembled to the first mounting hole 111 of the flange surface 11 of the cover body 1 of the continuous glass fiber composite material battery 200. The metal insert 2 can be installed on the cover 1 of the continuous glass fiber composite material battery 200 by interference fit. The metal insert 2 is processed into a "C" shape. In the present embodiment, the metal insert 2 is fixed to the cover 1 of the continuous glass fiber composite material battery 200 by the expansion force. Due to the manufacturing tolerance of parts, after the cover 1 of the continuous glass fiber composite material battery 200 is fastened to the battery lower box by bolts, there is a channel for water to enter the battery pack through the gap of the metal insert 2. Therefore, even if there is condensed water entering the sealed air chamber 323 from the gap of the metal insert 2, due to the double blocking effect of the first rib 321 and the second rib 322, it is difficult for the condensed water to enter the battery pack, thereby ensuring the use of the battery and avoiding the possibility of battery failure or damage.

[0048] In addition, please refer to Figure 2 and Figure 3The metal insert 2 and the sealing gasket 3 are connected by bonding, wherein F≥7N / mm, and F is the bonding force. It can be understood that the metal insert 2 is installed on the cover body 1, and the sealing gasket 3 is also installed on the cover body 1. For the sake of sealing, the first mounting hole 111 of the cover body 1 and the second mounting hole 31 of the sealing gasket 3 are connected, wherein the outer end body 22 of the metal insert 2 is installed in the first mounting hole 111, and the inner end body 21 of the metal insert 2 is installed in the second mounting hole 31. In this way, for the sake of the airtightness of the cover body 1 after assembly, the metal insert 2 and the sealing gasket 3 also need to be connected. Therefore, the metal insert 2 and the sealing gasket 3 are connected by bonding, wherein F≥7N / mm, F is the bonding force, when the bonding force is less than 7N / mm, condensed water can penetrate from here, but when the bonding force is greater than or equal to 7N / mm, it can be ensured that condensed water cannot penetrate from here.

[0049] It can be understood that in order to simplify the process and facilitate the operation, the operator coats the surface of the metal insert 2 with liquid adhesive, puts it into the second mounting hole 31 left after the sealing gasket 3 is cut and formed, and then puts the sealing gasket 3 into an oven for curing at a certain temperature and then takes it out. In this way, the metal insert 2 and the sealing gasket 3 can be connected into a whole, thereby greatly improving the sealing performance at the notch of the metal insert 2.

[0050] In addition, the material of the sealing gasket 3 is foamed silicone foam. It is understandable that the foamed silicone foam is made of AB two-component silicone material that is mixed, calendered, cured, cut and spliced ​​to match the cover body 1. The thickness of the sealing gasket 3 is 4 to 10 mm, which can be adjusted according to different size requirements. The key performance and requirements of the sealing gasket 3: the flame retardant performance reaches UL 94V0 level, and the compression permanent deformation (after 70h×100℃) is ≤5%. With such requirements, it is understandable that the battery will also generate heat when working, and its temperature will spread to the surroundings, especially the sealing gasket 3 will be the first to bear the brunt. If the heat reaches its melting point, it is very easy to cause a fire. Therefore, in some embodiments, it is necessary to require the flame retardant performance to reach UL 94V0 level.

[0051] In addition, please refer to Figure 1 , the inner side of the cover body 1 is provided with a plurality of limiting protrusions 12. It is understandable that when the cover body 1 is assembled, it is difficult to align without an external reference. Therefore, in some embodiments, the inner side of the cover body 1 is provided with a plurality of limiting protrusions 12, which can provide a certain reference to help position the cover body 1 when assembled, and can ensure that the compression amount of the sealing gasket 3 is determined when the cover body 1 is assembled.

[0052] In addition, the thickness of the flange surface 11 is greater than the thickness of the cover body 1. It can be understood that the flange surface 11 is provided with a plurality of first mounting holes 111 for mounting the metal insert 2. For strength considerations, the thickness of the flange surface 11 is greater than the thickness of the cover body 1. This setting is also to meet the waterproof level requirements of the battery pack.

[0053] It can be understood that the cover body 1, the metal insert 2 and the foamed silicone sealing gasket 3 of the continuous glass fiber composite battery 200 form the battery cover structure 100 through an integrated glue coating vulcanization process; and the water inlet path of the flange surface 111 of the cover body 1 of the continuous glass fiber composite material battery 200 is eliminated, thereby ensuring the sealing, safety and reliability of the battery pack.

[0054] It can be understood that the battery upper cover structure 100 has a wide range of applicability, and can be used as long as the cover body 1 and the lower box of the battery pack are tightened with bolts. At the same time, since the cover body 1 is convexly provided with the limiting protrusion 112, the gap between the cover body 1 and the lower box of the battery pack can be ensured, and the compression amount of the sealing gasket 3 of the foamed silicone can be determined; and for the bolt holes of the lower box, whether rivet nuts, countersunk holes or welding nuts are used, the battery upper cover structure 100 is applicable, that is, the battery upper cover structure 100 in this embodiment is suitable for a variety of lower boxes of battery packs, and is easy to install and replace.

[0055] The present invention also proposes a continuous glass fiber composite material battery, wherein the continuous glass fiber composite material battery 200 includes the battery pack upper cover structure 100. The specific structure of the battery pack upper cover structure 100 refers to the above-mentioned embodiment. Since the continuous glass fiber composite material battery 200 adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0056] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A battery pack cover structure, characterized in that: include: The cover body is provided with a flange surface protruding from the circumferential side along the joint, and a first mounting hole is penetrated on the flange surface; and A metal insert is arranged in an annular shape and fixedly arranged in the first mounting hole; the metal insert comprises an inner end body and an outer end body, and is arranged in a stepped manner along the thickness direction of the cover body; The inner end body is clamped on the inner end surface of the cover body, the upper end body protrudes from the upper end surface of the cover body, and the bolt is installed in the first installation hole through the annular hole of the metal insert.

2. The battery pack cover structure according to claim 1, characterized in that: The battery pack upper cover structure also includes a sealing gasket attached to the inner end surface of the cover body; The sealing gasket is provided with a second mounting hole corresponding to the first mounting hole, and the inner end body is located in the second mounting hole.

3. The battery pack cover structure according to claim 2, characterized in that: The sealing gasket is provided with a sealing structure for waterproofing the battery pack upper cover structure after being assembled.

4. The battery pack cover structure as claimed in claim 3, characterized in that: The sealing structure comprises a first rib, which is protruded from the sealing gasket in a direction away from the cover body and arranged along an extending direction of the circumference of the cover body.

5. The battery pack cover structure as claimed in claim 4, characterized in that: The sealing structure further comprises: A second rib protrudes from the sealing gasket in a direction away from the cover body and is arranged along an extending direction of a circumference of the cover body; A sealed air chamber is formed between the first rib and the second rib.

6. The battery pack cover structure as claimed in claim 2, characterized in that: The metal insert and the sealing gasket are connected by bonding, wherein F≥7N / mm, and F is the bonding force.

7. The battery pack cover structure as claimed in claim 2, characterized in that: The sealing pad is made of foamed silicone foam.

8. The battery pack cover structure according to claim 1, characterized in that: A plurality of limiting protrusions are convexly arranged on the inner side of the cover body.

9. The battery pack cover structure according to claim 1, characterized in that: The thickness of the flange surface is greater than the thickness of the cover body.

10. A continuous glass fiber composite battery, characterized in that: The continuous glass fiber composite material battery includes the battery pack cover structure as described in any one of claims 1-9.

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