Airbag end plate, battery pack and electric vehicle

Abstract

The utility model provides a kind of air bag end plate, battery pack and electric car belong to battery technical field, including end plate, the surface of the end plate is provided with air bag, the surface of the air bag is provided with inflation port and pressure relief valve.The air bag end plate of the utility model includes end plate, end plate surface is provided with air bag, the surface of the air bag is provided with inflation port and pressure relief valve.Gas is filled into air bag, and then air bag is inflated and contacted with the end face of battery cell, the fixation of battery cell is realized, the battery cell is prevented from shaking due to vehicle movement or battery pack carrying process, and fire or explosion is caused;when battery cell works and expands due to heating, and then air bag is squeezed, air bag reaches pressure relief pressure, and pressure relief valve is opened, gas is released through pressure relief valve, and then gas is released, and the effect of automatically adjusting battery cell expansion space is achieved.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, and specifically relates to an airbag end plate, a battery pack, and an electric vehicle. Background Technology

[0002] In existing CTP (Cell to Pack) modules, the expansion space of the end plate is released through the end plate structure design. Currently, the end plate and module (multiple cells assembled into a module) need to be installed into the enclosure using a matching module mounting fixture, thus securing the module with an interference fit between the end plate, module, and enclosure. However, the height of the internal horizontal and vertical beams is limited by impacts during module and end plate installation using the mounting fixture, resulting in a relatively low beam height and affecting the overall rigidity of the battery pack. Therefore, existing technologies must consider the beam height when designing the enclosure. Furthermore, the cells in the module expand during use, causing compression between the cells, end plate, and enclosure, potentially leading to cell damage.

[0003] In order to prevent damage to the battery cells after they expand in the module, and to install the module and end plate into the box without the need for tooling, an airbag end plate that can adjust the expansion space of the battery cells needs to be designed. Utility Model Content

[0004] To address the aforementioned problems, this utility model proposes an airbag end plate, comprising an end plate, an airbag disposed on the surface of the end plate, and an inflation port and a pressure relief valve disposed on the surface of the airbag.

[0005] Furthermore, the inflation port and the pressure relief valve are located on the same side of the airbag.

[0006] A battery pack includes a housing, battery cells, and the aforementioned airbag end plate; the airbag end plate and battery cells are installed in the housing, and the airbag end plate is installed at least one end of the battery cell; the end face of the battery cell contacts the side of the airbag away from the end plate.

[0007] Furthermore, the enclosure includes an enclosure frame and an enclosure bottom plate, the enclosure bottom plate is installed on the lower surface of the enclosure frame, and the battery cell is installed in the space enclosed by the enclosure bottom plate and the enclosure frame.

[0008] Furthermore, at least one end face of the battery cell contacts the side of the airbag away from the end plate, the end plate contacts the inner surface of the housing frame, and / or two adjacent and opposite end plates contact each other.

[0009] Furthermore, a crossbeam is provided on the upper surface of the bottom plate of the enclosure, and the crossbeam is located in the middle of the enclosure frame; at least one end face of the battery cell contacts the side of the airbag away from the end plate, the end plate contacts the inner surface of the enclosure frame, and / or the end plate contacts the crossbeam.

[0010] Furthermore, the inflation port and pressure relief valve are located on the side of the airbag away from the bottom plate of the housing.

[0011] Furthermore, the battery pack also includes a cell limiting strip, which is installed on the lower and / or upper surfaces of the airbags located at both ends of the same group of cells, and the two ends of the cell limiting strip are respectively connected to the outer surface of the end plate.

[0012] Furthermore, the battery pack also includes a cover, which is mounted on the upper surface of the housing.

[0013] An electric vehicle includes a body and the aforementioned battery pack, the battery pack being installed in the body.

[0014] Beneficial effects:

[0015] 1. The airbag end plate of this utility model includes an end plate, on the surface of which an airbag is disposed. An inflation port and a pressure relief valve are disposed on the surface of the airbag. Gas is inflated into the airbag, causing it to bulge and contact the end face of the battery cell, thus securing the battery cell and preventing it from shaking during vehicle movement or battery pack transport, which could lead to fire or explosion. When the battery cell expands due to heat during operation, compressing the airbag, the pressure relief valve opens after the airbag reaches its pressure relief pressure, releasing the gas and achieving the effect of automatically adjusting the expansion space of the battery cell.

[0016] 2. The airbag end plate of this utility model includes an end plate with an airbag on its surface. When installing the battery cell and the airbag end plate into the housing, the airbag is not inflated. The battery cell and the airbag end plate can be easily installed into the housing manually. Therefore, it can be achieved without tooling or auxiliary tools, and the height of the transverse and longitudinal beams inside the housing can be designed to be higher, thereby increasing the overall rigidity of the battery pack.

[0017] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention can be realized and obtained through the structures pointed out in the description and the accompanying drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1A schematic diagram of the overall structure of the airbag end plate in an embodiment of this utility model is shown.

[0020] Figure 2 This diagram illustrates the installation of the airbag end plate and cell limiting strip of the battery pack in an embodiment of the present invention.

[0021] Figure 3 A schematic diagram of the installation of the battery cells and housing in an embodiment of this utility model is shown.

[0022] Figure 4 The diagram shows a front view of the battery pack's cells and housing in an embodiment of the present invention.

[0023] Figure 5 It shows Figure 4 A schematic diagram of the cross-section at point AA.

[0024] Figure 6 It shows Figure 5 A magnified view of part B.

[0025] In the diagram, 10 is the airbag end plate; 11 is the inflation port; 12 is the pressure relief valve; 13 is the end plate; 14 is the airbag; 20 is the battery cell limit strip; 30 is the housing; 31 is the housing frame; 32 is the housing bottom plate; 33 is the housing crossbeam; and 40 is the battery cell. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] Example 1,

[0028] refer to Figure 1 , Figure 1This diagram illustrates the overall structure of the airbag end plate in an embodiment of the present invention. An airbag end plate includes an end plate 13, with an airbag 14 disposed on one side surface of the end plate 13. An inflation port 11 and a pressure relief valve 12 are disposed on the surface of the airbag 14. Specifically, in use, an inflation device is connected to the inflation port 11 to inflate the airbag 14. Once the airbag 14 is inflated to a specified pressure, inflation is complete. The airbag 14 bulges and contacts the end face of the battery cell 40, thus securing the battery cell 40 and preventing it from shaking during vehicle movement or transport, which could lead to fire or explosion. When the battery cell 40 expands due to heat during operation, compressing the airbag 14, the pressure relief valve 12 opens after the airbag 14 reaches its pressure relief level. Gas is then released through the pressure relief valve 12, achieving automatic gas release and regulating the expansion space of the battery cell 40. Simultaneously, this prevents the airbag 14 from rupturing and provides space for the battery cell 40 to expand, or prevents damage to the housing 30 due to the expansion of the battery cell 40.

[0029] Furthermore, the inflation port 11 and the pressure relief valve 12 are located on the same side of the airbag 14. Specifically, the inflation port 11 and the pressure relief valve 12 can be located on the same side of the airbag 14 or on different sides of the airbag 14. For example, the inflation port 11 can be located on the upper surface of the airbag 14, and the pressure relief valve 12 can be located on the lower surface of the airbag 14.

[0030] Preferably, the inflation port 11 and the pressure relief valve 12 are located on the upper surface of the airbag 14. Since the two large surfaces (the two opposite surfaces with the largest areas) of the airbag 14 are in contact with the battery cell 40 and the end plate 13 is installed thereon, and the airbag 14 needs to be placed inside the housing 30, it is the optimal choice to place the inflation port 11 and the pressure relief valve 12 on the upper surface of the airbag 14.

[0031] Example 2,

[0032] refer to Figure 3 A battery pack includes a housing 30, a battery cell 40, and an airbag end plate of embodiment 1; the battery cell 40 and the airbag end plate 10 are installed in the housing 30, and the airbag end plate 10 is installed at least one end of the battery cell 40; the end face of the battery cell 40 contacts the side of the airbag 14 away from the end plate 13.

[0033] Specifically, by installing airbag end plates 10 at both ends of the battery cell 40, the airbag 14 of the airbag end plate 10 is made in contact with the end face of the battery cell 40, thereby fixing the battery cell 40 and preventing the battery cell 40 from shaking during vehicle movement or transportation, which could lead to fire or explosion. When the battery cell 40 expands due to heat during operation and compresses the airbag 14, the pressure relief valve 12 opens after the airbag 14 reaches the pressure relief pressure. At this time, the gas is released through the pressure relief valve 12, thereby releasing the gas. At the same time, the airbag 14 is prevented from rupturing and space is provided for the expansion of the battery cell 40, preventing damage to the housing 30 due to the expansion of the battery cell 40 or damage to the battery cell 40 due to being confined in a narrow space.

[0034] Furthermore, a crossbeam 33 is provided in the housing 30, and the crossbeam 33 contacts the end plate 13. For example... Figure 4 As shown, three crossbeams 33 are provided in the housing 30, which divide the housing 30 into four spaces, thus facilitating the placement of three sets of battery cells 40 and control components of the battery pack. The end plates 13 of the airbag end plates 10 installed at both ends of the battery cells 40 contact the crossbeams 33 and / or the inner side of the housing frame 31 of the housing 30, thereby fixing the battery cells 40, protecting the battery cells 40, and grouping the battery cells 40 together, improving the efficiency and neatness of battery installation.

[0035] In the above embodiments, another optional implementation is that the housing 30 includes a housing frame 31 and a housing bottom plate 32, the housing bottom plate 32 is installed on the lower surface of the housing frame 31, and the battery cell 40 is installed in the space enclosed by the housing bottom plate 32 and the housing frame 31.

[0036] Specifically, the enclosure 30 includes an enclosure frame 31, an enclosure base plate 32, and an enclosure cover. The enclosure frame 31, the enclosure base plate 32, and the enclosure cover form a complete enclosure. The enclosure cover is installed on the upper surface of the enclosure base plate 32 and is used to place the battery cell 40. The enclosure 30 is mainly used to place the battery cell 40 and to protect the battery cell 40, preventing the battery cell 40 from being damaged, catching fire, or exploding due to impact or bump.

[0037] refer to Figure 5 and Figure 6At least one end face of the battery cell 40 contacts the side of the airbag 14 away from the end plate 13. The end plate 13 contacts the inner surface of the housing frame 31, and / or two adjacent and opposite end plates 13 contact each other. Specifically, the housing 30 does not have a housing beam 33, that is, the housing 30 is an empty housing. In this case, airbag end plates 10 are installed on both sides of the battery cell 40. There are two contact situations for the end plates 13 of the airbag end plates 10: one is that the end plate 13 contacts the inner surface of the housing 30, and the other is that two adjacent and opposite end plates 13 contact each other. This situation can facilitate the installation of the battery cell 40 and is suitable for battery packs with fewer battery cells 40, such as installing only 2 sets of battery cells 40. The above method has the advantages of simple manufacturing and low cost.

[0038] Furthermore, a box body crossbeam 33 is provided on the upper surface of the box body bottom plate 32, and the box body crossbeam 33 is located in the middle of the box body frame 31; at least one end face of the battery cell 40 contacts the side of the airbag 14 away from the end plate 13, the end plate 13 contacts the inner surface of the box body frame 31, and / or the end plate 13 contacts the box body crossbeam 33.

[0039] refer to Figure 5 and Figure 6 The housing 30 is provided with a housing beam 33, which facilitates the placement of the battery cell 40. The end plates 13 of the airbag end plates 10 installed at both ends of the battery cell 40 contact the housing beam 33 and / or the inner side of the housing frame 31 of the housing 30, thereby fixing the battery cell 40, protecting the battery cell 40, and grouping the battery cells 40, which improves the efficiency and neatness of battery installation.

[0040] Furthermore, the inflation port 11 and the pressure relief valve 12 are located on the side of the airbag 14 away from the bottom plate 32 of the housing. Specifically, since the inflation port 11 and the pressure relief valve 12 are located on the upper surface of the airbag 14, and since the two large surfaces (the two largest opposing surfaces) of the airbag 14 are in contact with the battery cell 40 and have end plates 13 installed thereon, and since the airbag 14 needs to be placed inside the housing 30, it is the optimal choice to place the inflation port 11 and the pressure relief valve 12 on the upper surface of the airbag 14.

[0041] refer to Figure 2 The battery pack also includes a cell limiting strip 20, which is installed on the lower and / or upper surfaces of the airbags 14 located at both ends of the same group of cells 40. The two ends of the cell limiting strip 20 are respectively connected to the outer surface of the end plate 13.

[0042] Specifically, the cell limiting strip 20 is installed on the outside of the end plate 13 of the airbag end plate 10 at both ends of the same cell 40. The cell limiting strip 20 is used to further limit the airbag end plate 10 at both ends of the same cell 40, so as to prevent the end plate 13 from shifting due to the force of the airbag 14, which would weaken the protective function of the airbag 14 and cause the cell 40 to move and be easily bumped.

[0043] In the above embodiments, another optional implementation is that the cell limiting strip 20 is installed on the lower surface of the end plate 13 of the airbag end plate 10 at both ends of the same cell 40. The cell limiting strip 20 is used to further limit the airbag end plates 10 at both ends of the same cell 40, thereby preventing the end plate 13 from shifting due to the force on the airbag 14, which would weaken the protective function of the airbag 14, and cause the cell 40 to move and cause the cell 40 to catch fire or explode.

[0044] In the above embodiments, another optional implementation is that the cell limiting strip 20 is installed on the upper surface of the end plate 13 of the airbag end plate 10 at both ends of the same cell 40. The cell limiting strip 20 is used to further limit the airbag end plates 10 at both ends of the same cell 40, thereby preventing the end plate 13 from shifting due to the force on the airbag 14, which would weaken the protective function of the airbag 14, and cause the cell 40 to move and cause the cell 40 to catch fire or explode.

[0045] Assembly process of this utility model:

[0046] Step 1: When assembling this utility model, the first step is to produce the housing 30. Specifically, this involves producing a housing frame 31 and a housing base plate 32 of specified dimensions, installing the housing frame 31 onto the housing base plate 32 with screws, and cutting the interior of the housing 30 into equal-sized spaces according to the size of the battery cell 40 by installing the housing crossbeam 33.

[0047] Step 2: Attach the airbag 14 to the end plate 13 with glue, and install the inflation port 11 and the pressure relief valve 12 on the airbag 14 as needed.

[0048] Step 3: Place the battery cell 40 into the housing 30, and position it between two adjacent housing beams 33 or between the housing beam 33 and the housing frame 31.

[0049] Step 4: Install the end plate 13 with airbag 14 onto the end face of the battery cell 40, so that the airbag 14 contacts the battery cell 40, the end plate 13 contacts the box beam 33 and / or the end plate 13 contacts the inner surface of the box frame 31.

[0050] Step 5: Install the cell limiting strip 20 onto the outside of the end plate 13 of the airbag end plate 10 at both ends of the same cell 40. That is, the cell limiting strip 20 further restricts the position of the end plate 13.

[0051] Step 6: Inflate all airbags 14 by connecting the inflation device to the inflation port 11. After the airbags 14 are inflated to the specified pressure, they will contact the battery cell 40, thereby limiting the battery cell 40.

[0052] Example 3,

[0053] An electric vehicle includes a body and a battery pack according to Embodiment 2, the battery pack being installed in the body. Specifically, by using the battery pack of the above embodiment in the electric vehicle, the battery cell 40 is better protected, preventing the battery cell 40 from catching fire or exploding due to a collision with the electric vehicle.

[0054] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery pack, characterized in that, It includes a housing (30), a battery cell (40), and an airbag end plate (10); the airbag end plate (10) and the battery cell (40) are installed in the housing (30), and the airbag end plate (10) is installed at least one end of the battery cell (40); the end face of the battery cell (40) is in contact with the side of the airbag (14) away from the end plate (13); The airbag end plate (10) includes an end plate (13), on the surface of the end plate (13) an airbag (14) is provided, and on the surface of the airbag (14) an inflation port (11) and a pressure relief valve (12) are provided; the inflation port (11) and the pressure relief valve (12) are located on the same side of the airbag (14).

2. The battery pack according to claim 1, characterized in that, The enclosure (30) includes an enclosure frame (31) and an enclosure bottom plate (32). The enclosure bottom plate (32) is installed on the lower surface of the enclosure frame (31), and the battery cell (40) is installed in the space enclosed by the enclosure bottom plate (32) and the enclosure frame (31).

3. A battery pack according to claim 2, characterized in that, At least one end face of the battery cell (40) is in contact with the side of the airbag (14) away from the end plate (13), the end plate (13) is in contact with the inner surface of the frame (31) of the housing, and / or two adjacent and opposite end plates (13) are in contact with each other.

4. A battery pack according to claim 2, characterized in that, The upper surface of the bottom plate (32) of the box is provided with a box beam (33), and the box beam (33) is located in the middle of the box frame (31); at least one end face of the battery cell (40) is in contact with the side of the airbag (14) away from the end plate (13), the end plate (13) is in contact with the inner surface of the box frame (31), and / or the end plate (13) is in contact with the box beam (33).

5. A battery pack according to any one of claims 3-4, characterized in that, The inflation port (11) and the pressure relief valve (12) are located on the side of the airbag (14) away from the bottom plate (32) of the box.

6. A battery pack according to claim 1, characterized in that, The battery pack also includes a cell limiting strip (20), which is installed on the lower and / or upper surfaces of the airbags (14) located at both ends of the same group of cells (40), and the two ends of the cell limiting strip (20) are respectively connected to the outer surface of the end plate (13).

7. A battery pack according to claim 1, characterized in that, The battery pack also includes a cover, which is mounted on the upper surface of the housing (30).

8. A tram, characterized in that, It includes a vehicle body and a battery pack as described in any one of claims 1-7, wherein the battery pack is installed in the vehicle body.

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