Battery cell shell, battery cell, battery pack and vehicle

Abstract

The utility model relates to a battery cell shell, a battery cell, a battery pack and a vehicle. The battery cell shell comprises a hollow shell body, the shell body is provided with a pole and a mounting area for mounting an anti-explosion valve, and the mounting area and the pole are respectively arranged on different surfaces of the shell body; a through hole is formed in the mounting area, the through hole is used for communicating a pressure relief air inlet of the explosion-proof valve with the inner cavity of the shell body, and a reinforcing piece is arranged on the periphery of the through hole, so that the situation that the battery cell is damaged in the pressure relief process is avoided to a certain extent.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a battery cell housing, a battery cell, a battery pack and a vehicle. Background Art

[0002] At present, new energy electric vehicles are receiving more and more attention from the society and have become the development direction of future vehicles. The battery pack is an important component of electric vehicles, which includes a battery cell, a battery cell includes a shell and a winding core located in the shell, and the winding core has a winding core ear. The position of the shell corresponding to the winding core ear has a pole connected to the winding core ear and used for charging and discharging.

[0003] In actual use, the battery cell is prone to thermal runaway due to mechanical, electrical, thermal and other abuses, resulting in a large amount of gas generated in the shell in a short period of time, which can cause the battery pack to catch fire or even explode, endangering the safety of the occupants. In the related art, an explosion-proof valve is usually set on the shell. When thermal runaway occurs, the explosion-proof valve can be opened to release pressure in the inner cavity of the shell, thereby reducing the risk of fire and explosion of the battery cell. However, in the related art, the battery cell is easily damaged during the pressure release process. Utility Model Content

[0004] In order to solve the above technical problems, the present application provides a battery cell housing, a battery cell, a battery pack and a vehicle.

[0005] In a first aspect, the present application provides a battery cell housing, comprising a hollow housing body;

[0006] The shell body has a pole and an installation area for installing an explosion-proof valve, and the installation area and the pole are arranged on different surfaces of the shell body;

[0007] A through hole is provided on the installation area, and the through hole is used to connect the pressure relief air inlet of the explosion-proof valve and the inner cavity of the shell body, and a reinforcement piece is provided on the periphery of the through hole.

[0008] In some embodiments, the pole and the mounting area are arranged on two oppositely disposed end surfaces of the shell body.

[0009] In some embodiments, the reinforcement member is an annular structure arranged around the through hole in a circumferential direction;

[0010] The reinforcement member is a reinforcement protrusion.

[0011] In some embodiments, the projection of the reinforcement protrusion on the surface where the installation area is located is located within the area surrounded by the outer contour of the shell body;

[0012] And / or, the reinforcing protrusion is integrally formed with the shell body by stamping;

[0013] And / or, the axial dimension of the reinforcing protrusion is between 1 / 2 and 2 times the wall thickness of the shell body corresponding to the installation area.

[0014] In some embodiments, the reinforcing protrusion is located on a side of the shell body that is away from the inner cavity of the shell body;

[0015] The reinforcing protrusion is provided with a positioning portion for positioning the explosion-proof valve.

[0016] In some embodiments, the positioning portion is a positioning groove in which a part of the reinforcing protrusion is recessed toward the inner cavity of the shell body;

[0017] The positioning groove is extended along the circumference of the reinforcing protrusion and is used for at least a portion of the explosion-proof valve to extend into.

[0018] In some embodiments, a side surface of the explosion-proof valve away from the inner cavity of the shell body does not protrude from the notch of the positioning groove;

[0019] And / or, the size of the positioning groove is adapted to the outer contour size of the explosion-proof valve;

[0020] and / or, in the axial direction of the reinforcing protrusion, the groove depth of the positioning groove is not greater than the axial dimension of the reinforcing protrusion;

[0021] And / or, in the radial direction of the reinforcing protrusion, the distance between the outer edge of the reinforcing protrusion and the groove wall of the positioning groove is not less than 3.5 mm.

[0022] In a second aspect, the present application provides a battery cell, comprising the battery cell shell as described above.

[0023] In a third aspect, the present application provides a battery pack comprising the battery cell as described above.

[0024] In a fourth aspect, the present application provides a vehicle, comprising the battery cell as described above, or the vehicle comprises the battery pack as described above.

[0025] Compared with the prior art, the technical solution provided by the embodiments of the present application has the following advantages:

[0026] The cell shell, cell, battery pack and vehicle provided by the present application, by arranging the pole and the installation area for installing the explosion-proof valve on different surfaces of the shell body, compared with the solution of arranging the installation area and the pole on the same surface, can avoid to a certain extent the high-temperature and high-pressure gas blocking and accumulating in the through hole in the installation area for connecting the pressure relief air inlet of the explosion-proof valve and the inner cavity of the shell body during the pressure relief process of the cell, which leads to the high-voltage short circuit of the winding core pole ear, thereby reducing the probability of "secondary harm" caused by thermal runaway, and well protecting the entire cell, thereby reducing the probability of damage to the cell. At the same time, by arranging a reinforcement member on the periphery of the through hole, the structural strength of at least the position corresponding to the installation area on the shell body can be enhanced to a certain extent, thereby avoiding to a certain extent the deformation and damage of the cell shell due to the impact force during installation or use, thereby ensuring the stability of the explosion-proof valve during pressure relief, and playing a good protective role for the explosion-proof valve and the cell, to a certain extent improving the pressure relief effect of the explosion-proof valve, and effectively improving the safety of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0028] In order to more clearly illustrate the embodiments of the present application 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, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0029] Figure 1 This is a schematic diagram of the structure of the battery cell housing according to an embodiment of the present application;

[0030] Figure 2 A partial cross-sectional view of a battery cell casing according to an embodiment of the present application;

[0031] Figure 3 It is a cross-sectional schematic diagram of an explosion-proof valve installed on a battery cell housing according to an embodiment of the present application;

[0032] Figure 4 for Figure 3 An enlarged schematic diagram of the explosion-proof valve portion of the battery cell housing;

[0033] Figure 5 This is a schematic diagram of a portion of the shell described in an embodiment of the present application being formed in a stamping die.

[0034] Among them, 10, battery cell shell; 1, shell body; 11, shell; 111, through hole; 112, installation area; 12, cover; 2, reinforcement; 3, positioning part; 4, pole; 5, explosion-proof valve; 6, upper mold; 7, lower mold. DETAILED DESCRIPTION

[0035] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the scheme of the present application will be further described below. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0036] In the following description, many specific details are set forth to facilitate a full understanding of the present application, but the present application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only part of the embodiments of the present application, rather than all of the embodiments.

[0037] Reference Figures 1 to 5 As shown, this embodiment provides a battery cell housing, and the battery cell housing 10 can be specifically used in a battery pack of a vehicle. The battery pack may include at least one battery cell, and the battery cell may include a battery cell housing 10, an explosion-proof valve 5, and a winding core located in the battery cell housing 10. The explosion-proof valve 5 is specifically arranged on the battery cell housing 10, and the explosion-proof valve 5 has a pressure relief air inlet and a pressure relief air outlet that are connected.

[0038] The cell housing 10 specifically includes a hollow shell body 1, which has a pole 4 and an installation area 112 for installing an explosion-proof valve 5, and the installation area 112 and the pole 4 are arranged on different surfaces of the shell body 1. A through hole 111 is opened in the installation area 112, and the through hole 111 is used to connect the pressure relief air inlet of the explosion-proof valve 5 and the inner cavity of the shell body 1, and a reinforcement member 2 is arranged on the periphery of the through hole 111.

[0039] In specific implementation, the pressure relief channel can be connected at the pressure relief exhaust port of the explosion-proof valve 5 to connect the pressure relief channel with the outside of the battery pack, so that the high-temperature and high-pressure gas in the shell body 1 can be discharged through the through hole 111, the pressure relief air inlet, the pressure relief exhaust port and the pressure relief channel.

[0040] By arranging the installation area 112 and the pole 4 on different surfaces of the shell body 1, that is, the pressure relief area and the winding core ear during thermal runaway of the battery cell are in different areas, it can be avoided to a certain extent that during thermal runaway, the high-temperature and high-pressure gas is not discharged in time and accumulates and blocks between the through hole 111 and the pressure relief channel, thereby causing the high and low voltage lines of the battery cell to short-circuit, thereby achieving thermoelectric separation to a certain extent, avoiding the spread of thermal runaway to a certain extent, and well protecting the battery cell and other structures, reducing the probability of damage to the battery cell, and can extend the service life of the battery cell to a certain extent.

[0041] The cell shell provided in this embodiment, by arranging the pole 4 and the installation area 112 for installing the explosion-proof valve 5 on different surfaces of the shell body 1, can avoid to a certain extent the high-temperature and high-pressure gas blocking and accumulating at the through hole 111 for connecting the pressure relief air inlet of the explosion-proof valve 5 and the inner cavity of the shell body 1 during the pressure relief process of the cell, thereby causing the high-voltage short circuit of the winding core pole ear, thereby avoiding to a certain extent the situation of "secondary harm" caused by thermal runaway, and providing good protection for the entire cell, thereby reducing the probability of damage to the cell. At the same time, by arranging a reinforcement member 2 on the periphery of the through hole 111, the structural strength of at least the position corresponding to the installation area 112 on the shell body 1 can be enhanced to a certain extent, thereby avoiding to a certain extent the situation of deformation and damage of the cell shell due to impact force during installation or use, thereby ensuring the stability of the explosion-proof valve 5 during pressure relief, and playing a good protective role for the explosion-proof valve 5 and the cell, improving the pressure relief effect of the explosion-proof valve 5 to a certain extent, and effectively improving the safety of the battery pack.

[0042] In some embodiments, reference Figures 1 to 5 The shell body 1 includes a shell 11 and a cover 12. The shell 11 is hollow inside, and one side of the shell 11 has an opening, and the cover 12 is connected to the opening. The pole 4 is located on the cover 12, and the mounting area 112 is located on the shell 11. The wall thickness of the cover 12 is greater than the wall thickness of the shell 11.

[0043] Through the above-mentioned arrangement, the structural strength and stability of the cover body 12 can be improved to a certain extent, damage to the cover plate can be avoided to a certain extent, and the stable connection between the cover body 12 and the shell 11 is ensured. For example, when the pole 4 on the cover body 12 is subjected to a pulling force during the use of the battery pack in a vehicle, the above-mentioned arrangement can ensure the stable connection between the pole 4 and the cover body 12, so that the stability of the battery cell during use is high. Since the wall thickness of the shell 11 is smaller than that of the cover body 12, this is conducive to ensuring the energy density of the entire battery cell.

[0044] For example, the shell 11 and the cover 12 may be connected by welding, or the two may be connected by gluing, detachable means, etc.

[0045] In some embodiments, the pole 4 and the mounting area 112 are disposed on two opposite end surfaces of the shell body 1. This can increase the distance between the pole 4 and the mounting area 112 to a certain extent, further achieve thermal and electrical separation, and improve the protection effect of the pole and the winding core tab.

[0046] For example, when the pole 4 is located on the top end surface of the shell body 1 , the mounting area may be arranged on the bottom end surface of the shell body 1 .

[0047] When the battery pack includes multiple battery cells, the side surfaces of the shell bodies of the multiple battery cells adjacent to the poles will be contacted and stacked in sequence. Therefore, compared with the solution of setting the installation area on the side surface of the shell body adjacent to the pole, this can achieve thermal and electrical separation to protect the winding pole ears and the pole 4, while also avoiding to a certain extent the situation where the setting of the explosion-proof valve 5 affects the stacking of the battery cells. This can also improve the convenience of the above-mentioned exhaust pipe setting, facilitate the pressure relief of the explosion-proof valve 5, and at the same time do not occupy the stacking space of the battery cells, which is beneficial to saving the volume of the entire battery pack.

[0048] In some embodiments, the reinforcement member 2 is an annular structure arranged around the through hole 111. In this way, the end surface of the shell body 1 corresponding to the installation of the explosion-proof valve 5 can be thickened, so that the reinforcement member 2 can structurally strengthen the installation area 112 along the entire circumference of the through hole 111, thereby improving the structural strength of the shell body 1, ensuring the stability of the installation of the explosion-proof valve 5 on the shell body 1, thereby ensuring the stability of the pressure relief, and thus better protecting the battery cell and the explosion-proof valve 5, etc., and the battery pack is highly safe when used.

[0049] Of course, in other implementations, the reinforcement member 2 may also be at least two reinforcement ribs spaced apart on the outer peripheral side of the through hole 111 .

[0050] In some embodiments, the reinforcement member 2 is a reinforcement protrusion to reinforce the corresponding area of ​​the shell body 1 to ensure the stability and reliability of the installation of the explosion-proof valve 5.

[0051] Of course, in other embodiments, the reinforcement member 2 may also be a reinforcement block or the like.

[0052] In some embodiments, the projection of the reinforcing protrusion on the surface where the installation area 112 is located is located within the area enclosed by the outer contour of the shell body 1, so that the position of the installation area 112 on the shell body 1 corresponding to the installation of the explosion-proof valve 5 is thickened, that is, the shell body 1 is partially thickened. In this way, while ensuring the structural strength of the shell body 1 to ensure the stability of the explosion-proof valve 5, it can also avoid the overall thickening that makes the overall weight of the battery cell too large and causes the energy density of the battery cell to decrease too much.

[0053] In some embodiments, the reinforcing protrusion is integrally formed with the shell body 1 by stamping. In this way, the overall structural strength of the reinforcing protrusion and the shell body 1 is high, which can further improve the structural reinforcement effect of the reinforcing protrusion on the corresponding area of ​​the shell body 1, and this is also beneficial to improving the subsequent assembly efficiency.

[0054] Specifically, the reinforcing protrusion and the housing 11 are stamped and formed, and a stamping die is required in the stamping process, wherein the stamping die includes an upper die 6 and a lower die 7 which are arranged opposite to each other. Figure 5 As shown, the upper mold 6 can be a male mold and the lower mold 7 can be a female mold, and the forming of the reinforcing protrusion and the shell 11 can be achieved through the cooperation of the upper mold 6 and the lower mold 7.

[0055] In some embodiments, the axial dimension of the reinforcing protrusion is between 1 / 2 and 2 times the wall thickness of the shell body 1 corresponding to the mounting area 112. Figure 2 Z direction shown.

[0056] This arrangement ensures the structural reinforcement effect of the reinforcement protrusion on the corresponding area of ​​the shell body 1, while also being able to avoid to a certain extent the situation where the axial dimension of the reinforcement protrusion is too large, causing the entire battery shell 10 to be too heavy and resulting in an excessive decrease in the energy density of the battery cell.

[0057] In addition, when the reinforcing protrusion and the shell body 1 are formed by stamping, the above arrangement can also avoid the situation where the axial dimension of the reinforcing protrusion is too large, which causes inconvenience in stamping, to a certain extent, and is conducive to improving the forming efficiency.

[0058] Among them, refer to Figure 2 As shown, the dimension of the shell body 1 in the axial direction of the reinforcing protrusion is set to T1, and the axial dimension of the reinforcing protrusion is set to T2, then 0.5·T1≤T2≤2·T1.

[0059] In some embodiments, reference Figures 1 to 5 As shown, the reinforcement protrusion is located on the side of the shell body 1 that is away from the inner cavity of the shell body 1 .

[0060] Such an arrangement can enhance the structural strength of the corresponding area of ​​the shell body 1. Compared with the solution of arranging the reinforcement on the side of the shell body facing the inner cavity of the shell body, the above arrangement can also avoid the situation where the reinforcement 2 occupies the internal space of the shell body 1, and to a certain extent avoid the situation where the reinforcement 2 affects the winding core inside the shell body 1, and is conducive to the development of the battery cell in the direction of miniaturization.

[0061] In some embodiments, reference Figures 1 to 4 As shown, a positioning portion 3 for positioning the explosion-proof valve 5 is provided on the reinforcing protrusion.

[0062] In this way, the explosion-proof valve 5 can be well positioned through the positioning portion 3, which is beneficial to improving the installation efficiency of the explosion-proof valve 5. At the same time, it can also improve the stability of the position of the explosion-proof valve 5 to a certain extent, further ensuring a good pressure relief effect and high safety of the battery pack.

[0063] In some embodiments, the positioning portion 3 is a positioning groove in which a part of the reinforcing protrusion is recessed toward the inner cavity of the shell body 1. The positioning groove is arranged to extend along the circumference of the reinforcing protrusion and is used for at least part of the explosion-proof valve 5 to extend therein.

[0064] With this arrangement, the explosion-proof valve 5 can be well positioned through the positioning groove, thereby improving the installation efficiency of the explosion-proof valve 5 and ensuring the stability of the position of the explosion-proof valve 5 to a certain extent. At the same time, this can also save material costs to a certain extent.

[0065] Exemplarily, when the housing 11 and the reinforcing protrusion are integrally formed, the positioning groove is integrally formed on the reinforcing protrusion.

[0066] Of course, a plurality of positioning protrusions extending in a direction away from the inner cavity of the shell body 1 may also be provided on the reinforcing protrusion, and the positioning protrusions may be enclosed to form the above-mentioned positioning groove.

[0067] In specific implementation, for example, the explosion-proof valve 5 can be connected to the bottom groove wall of the positioning groove by welding.

[0068] In some embodiments, reference Figure 4 As shown, the side of the explosion-proof valve 5 away from the inner cavity of the shell body 1 does not protrude from the notch of the positioning groove. This can avoid interference between the explosion-proof valve 5 and the external structure to a certain extent, protect the explosion-proof valve 5 to a certain extent, and also improve the appearance of the battery cell to a certain extent.

[0069] Exemplarily, the depth of the positioning groove may be no greater than the thickness of the explosion-proof valve 5 .

[0070] In some embodiments, reference Figure 4 As shown, the size of the positioning groove is adapted to the outer contour size of the explosion-proof valve 5. This can further improve the positioning effect of the positioning groove on the explosion-proof valve 5, and further protect the battery housing 10 and the explosion-proof valve 5.

[0071] For example, the portion of the positioning groove located outside the through hole 111 is Figure 2 The dimension in the X direction is H1. After the explosion-proof valve 5 is installed in place on the shell body 1, the portion of the explosion-proof valve 5 outside the through hole 111 is Figure 2 The size in the X direction is 1.5 mm, so H1 can be 1.5 mm.

[0072] In some embodiments, reference Figures 1 to 4 As shown, along the axial direction of the reinforcing protrusion, the depth of the positioning groove is not greater than the axial dimension of the reinforcing protrusion. In other words, the positioning groove is completely opened on the reinforcing protrusion without affecting the part of the shell body 1 corresponding to the positioning groove. Figure 2The thickness in the Z direction as shown can ensure the structural strength of the corresponding installation area 112 of the shell body 1 while achieving the positioning of the explosion-proof valve 5.

[0073] In some embodiments, in the radial direction of the reinforcing protrusion, the distance between the outer edge of the reinforcing protrusion and the groove wall of the positioning groove is not less than 3.5 mm. Figure 2 X direction shown.

[0074] In this way, the positioning groove can be used to position the explosion-proof valve 5 while ensuring the reinforcing effect of the reinforcing protrusion on the installation area of ​​the explosion-proof valve 5, thereby further protecting the shell body 1 and the explosion-proof valve 5.

[0075] The outer ring size of the reinforcing protrusion and half of the inner ring size are set as H2, and the distance between the outer edge of the reinforcing protrusion and the groove wall of the positioning groove is Figure 2 The difference between H2 and H1, that is, H2-H1≥3.5mm. Since H1 is 1.5mm, H2≥5mm.

[0076] In specific implementation, H2 can also be made ≤10mm, so as to ensure the energy density of the battery cell while ensuring the structural strength and positioning effect.

[0077] This embodiment further provides a battery cell, including a battery cell shell 10 .

[0078] The specific structure and implementation principle of the battery cell housing 10 in this embodiment are the same as those of the battery cell housing 10 provided in the above embodiment, and can bring the same or similar technical effects. For details, please refer to the description of the above embodiment.

[0079] This embodiment also provides a battery pack, including a battery cell.

[0080] The specific structure and implementation principle of the battery cell in this embodiment are the same as those of the battery cell provided in the above embodiment, and can bring the same or similar technical effects. For details, please refer to the description of the above embodiment.

[0081] This embodiment also provides a vehicle, including a battery cell or a battery pack.

[0082] The specific structure and implementation principle of the battery cell or battery pack in this embodiment are the same as those of the battery cell or battery pack provided in the above embodiments, and can bring the same or similar technical effects. For details, please refer to the description of the above embodiments.

[0083] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0084] The above is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features applied for herein.

Claims

1. A battery cell casing, characterized in that: including a hollow shell body; The shell body has a pole and an installation area for installing an explosion-proof valve, and the installation area and the pole are arranged on different surfaces of the shell body; A through hole is provided on the installation area, and the through hole is used to connect the pressure relief air inlet of the explosion-proof valve and the inner cavity of the shell body, and a reinforcement piece is provided on the periphery of the through hole.

2. The battery cell casing according to claim 1, characterized in that: The pole and the mounting area are arranged on two oppositely arranged end surfaces of the shell body.

3. The battery cell casing according to claim 1, characterized in that: The reinforcement member is an annular structure arranged around the through hole in the circumferential direction; The reinforcement member is a reinforcement protrusion.

4. The battery cell casing according to claim 3, characterized in that: The projection of the reinforcing protrusion on the surface where the installation area is located is located within the area surrounded by the outer contour of the shell body; And / or, the reinforcing protrusion is integrally formed with the shell body by stamping; And / or, the axial dimension of the reinforcing protrusion is between 1 / 2 and 2 times the wall thickness of the shell body corresponding to the installation area.

5. The battery cell casing according to claim 3, characterized in that: The reinforcing protrusion is located on a side of the shell body that is away from the inner cavity of the shell body; The reinforcing protrusion is provided with a positioning portion for positioning the explosion-proof valve.

6. The battery cell casing according to claim 5, characterized in that: The positioning portion is a positioning groove in which a part of the reinforcing protrusion is recessed toward the inner cavity of the shell body; The positioning groove is extended along the circumference of the reinforcing protrusion and is used for at least a portion of the explosion-proof valve to extend into.

7. The battery cell casing according to claim 6, characterized in that: A side surface of the explosion-proof valve away from the inner cavity of the shell body does not protrude from the notch of the positioning groove; And / or, the size of the positioning groove is adapted to the outer contour size of the explosion-proof valve; and / or, in the axial direction of the reinforcing protrusion, the groove depth of the positioning groove is not greater than the axial dimension of the reinforcing protrusion; And / or, in the radial direction of the reinforcing protrusion, the distance between the outer edge of the reinforcing protrusion and the groove wall of the positioning groove is not less than 3.5 mm.

8. A battery cell, characterized in that: Comprising the battery cell casing according to any one of claims 1 to 7.

9. A battery pack, characterized in that: Comprising the battery cell as claimed in claim 8.

10. A vehicle, characterized in that: The vehicle comprises the battery cell as claimed in claim 8, or the vehicle comprises the battery pack as claimed in claim 9.

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