Battery cell shell and battery cell structure

Abstract

The utility model relates to the technical field of power batteries, and provides a battery cell shell and a battery cell structure. The battery cell shell comprises a shell body, a containing cavity used for containing a pole core of a battery cell structure is formed in the shell body, at least part of the area on the shell body is arched in the direction towards the interior of the shell body and forms a first convex part, and the first convex part is used for supporting the pole core; at least part of the first protruding part is recessed in the direction away from the interior of the shell body to form a second protruding part, a groove is formed in the side, facing the containing cavity, of the second protruding part, an anti-explosion hole is formed in the second protruding part, and an anti-explosion valve is arranged in the anti-explosion hole. According to the battery cell shell provided by the invention, the explosion-proof hole is formed in the second convex part, even if the pole core is supported on the first convex part, the pole core can be prevented from being in direct contact with the explosion-proof hole, so that the connectivity of the explosion-proof hole can be ensured, the explosion-proof hole is prevented from being blocked by the pole core, and normal circulation between the interior of the battery cell structure and the outside can be ensured; and the safety performance of the cell structure is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power batteries, and in particular to a battery cell shell and a battery cell structure. BACKGROUND

[0002] At present, in the process of manufacturing battery cells, in order to avoid interference between the pole piece in the pole core and the R angle inside the battery cell shell and cause short circuit, a protruding part is usually arranged inside the shell of the single battery, the protruding part protrudes into the interior of the single battery, the pole core is raised by the protruding part, and thus the interference is reduced.

[0003] In order to separate the explosion-proof valve from the pole, the explosion-proof valve is usually arranged on the protruding part, but this easily leads to poor connectivity between the inner cavity of the single battery and the explosion-proof hole, and even the pole core of the single battery directly abuts against the protruding part, the explosion-proof hole is blocked by the pole core, the airflow inside the single battery cannot normally circulate with the outside, and the explosion-proof effect is poor. CONTENT OF THE UTILITY MODEL

[0004] In order to solve the above technical problems or at least partially solve the above technical problems, the present application provides a battery cell shell and a battery cell structure.

[0005] The first aspect of the present application provides a battery cell shell, which comprises a shell body;

[0006] An accommodating cavity for accommodating a pole core of a battery cell structure is formed in the interior of the shell body, at least a part of the shell body is arched in a direction towards the interior of the shell body and forms a first protruding part, and the first protruding part is used for supporting the pole core;

[0007] At least a part of the first protruding part is recessed in a direction away from the interior of the shell body and forms a second protruding part, a groove in communication with the accommodating cavity is formed on the side of the second protruding part towards the accommodating cavity, an explosion-proof hole in communication with the groove is arranged on the second protruding part, and an explosion-proof valve is arranged in the explosion-proof hole.

[0008] Optionally, the first protruding part is arranged at the middle position of the bottom wall of the shell body and is arranged in a spaced manner with the inner side wall of the shell body, and an avoiding space is formed between the first protruding part and the inner side wall of the shell body.

[0009] Optionally, the first protruding part is arranged in extension in a first direction, the second protruding part and the groove on the second protruding part are arranged in extension in a second direction, notches are formed on the two sides of the first protruding part in the second direction, and the groove is in communication with the avoiding space through the notches;

[0010] The second direction intersects the first direction, and the second direction and the first direction are both perpendicular to the direction towards the interior of the shell body.

[0011] Optionally, the first convex part comprises a plurality of spaced convex structures, the plurality of convex structures are spaced, and the second convex part is located on one of the convex structures.

[0012] A first exhaust passage is formed between each adjacent convex structure, a groove on the second convex part forms a second exhaust passage, the convex structure and the inner side wall of the shell body at the opposite position form the avoidance space, and the first exhaust passage, the second exhaust passage and the avoidance space are in communication with each other.

[0013] Optionally, the arch height of the first convex part is between 0.3 mm and 0.5 mm.

[0014] Optionally, the ratio of the area of the projection of the first convex part on the bottom wall in the direction towards the inside of the shell body to the area of the bottom wall is between 20% and 90%.

[0015] Optionally, a sunken groove is formed on the side of the first convex part away from the accommodation cavity, the second convex part is arranged in the sunken groove, and the outer surface of the second convex part is lower than or flush with the outer surface of the shell body in the direction away from the inside of the shell body.

[0016] Optionally, a support part is arranged on the hole wall of the explosion-proof hole in the circumferential direction, and the explosion-proof valve is arranged on the side of the support part towards the inside of the shell body.

[0017] Optionally, the shell body, the first convex part and the second convex part are stamp-formed as an integrated structure.

[0018] Optionally, a mounting opening for the pole core to pass through is arranged on one side wall of the shell body, a cover plate is arranged at the mounting opening, a pole is arranged on the cover plate, and the first convex part is arranged on the side wall of the shell body opposite to the cover plate.

[0019] The second aspect of the application provides an electric core structure comprising a pole core and an electric core shell as described in any one of the above aspects, the pole core is arranged in the accommodation cavity of the electric core shell and supported on the first convex part.

[0020] Compared with the prior art, the technical scheme provided by the embodiments of the application has the following advantages:

[0021] The electric core shell and the electric core structure provided by the application include a shell body, an accommodation cavity for accommodating an electric core structure pole core is formed in the inside of the shell body, at least part of the region on the shell body is arched in the direction towards the inside of the shell body and forms a first convex part, the first convex part is used for supporting the pole core, it can be understood that the side of the first convex part towards the inside of the shell body can be formed with a convex feature, in this way, the pole core can be elevated, and then interference between the pole core and the R angle in the inside of the electric core shell can be avoided, the service life of the electric core structure is improved, at least part of the region on the first convex part is recessed in the direction away from the inside of the shell body and forms a second convex part, an explosion-proof hole in communication with the groove is formed on the second convex part, the explosion-proof hole can be in communication with the accommodation cavity through the groove, an explosion-proof valve is arranged in the explosion-proof hole, the side of the second convex part towards the accommodation cavity is formed with a groove in communication with the accommodation cavity, that is, the side of the second convex part towards the inside of the shell body can be formed with a groove feature, the explosion-proof hole is arranged on the second convex part, even when the pole core is supported on the first convex part, the pole core can be arranged in space away from the groove bottom wall of the groove away from the accommodation cavity, and then the pole core can be prevented from directly contacting the explosion-proof hole, the communication property of the explosion-proof hole can be ensured, so that the explosion-proof hole is prevented from being blocked by the pole core, the inside of the electric core structure can be ensured to be in normal circulation with the outside, and the safety performance of the electric core structure is improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] The drawings incorporated into the specification and forming a part of the specification, show embodiments consistent with the application, and together with the specification serve to explain the principles of the application.

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below, and obviously, other drawings can also be obtained by those skilled in the art without creative labor.

[0024] Figure 1 It is an embodiment of the electric core shell structure diagram of the utility model;

[0025] Figure 2 It is another view of the structure of the electric core shell of an embodiment of the utility model structure diagram;

[0026] Figure 3 It is a top view of the electric core shell of an embodiment of the utility model;

[0027] Figure 4 It is Figure 3 the sectional view of A-A direction;

[0028] Figure 5 It is Figure 4 the local enlarged view of B part;

[0029] Figure 6For Figure 4 A partial enlarged view of the middle C part;

[0030] Figure 7 For Figure 3 A sectional view in the direction of D-D;

[0031] Figure 8 For Figure 7 A partial enlarged view of the middle E part.

[0032] In the figure: 1, shell body; 11, containing cavity; 12, first convex part; 121, boss structure; 13, second convex part; 14, explosion-proof hole; 141, support part; 15, avoiding space; 16, first exhaust channel; 17, second exhaust channel; 2, explosion-proof valve. DETAILED DESCRIPTION

[0033] In order to enable the above-mentioned purposes, features and advantages of the present application to be more clearly understood, 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.

[0034] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some of the embodiments of the present application, not all the embodiments.

[0035] The electric core shell and the electric core structure will be described in detail below through specific embodiments:

[0036] Referring to Figures 1 to 8 The utility model provides an electric core shell which comprises a shell body 1.

[0037] Among them, the inside of the shell body 1 is formed with containing cavity 11 for accommodating the electric core structure pole core, the shell body 1 is at least partial area and forms the first convex part 12 along the direction of the inside of the shell body 1, and the first convex part 12 is used to support the pole core, it can be understood that the side of the first convex part 12 towards the inside of the shell body 1 can form a raised feature, so the pole core can be elevated, and interference between the pole core and the R angle inside the electric core shell can be avoided, and the service life of the electric core structure is improved.

[0038] Specifically, at least part of the first protrusion 12 is recessed in a direction away from the inside of the shell body 1 and forms a second protrusion 13, the second protrusion 13 is provided with an explosion-proof hole 14 communicating with the groove, the explosion-proof hole 14 can communicate with the accommodation cavity 11 through the groove, the explosion-proof valve 2 is arranged in the explosion-proof hole 14, and the second protrusion 13 is provided with a groove communicating with the accommodation cavity 11 on the side facing the accommodation cavity 11, that is, the side of the second protrusion 13 facing the inside of the shell body 1 can be formed with a groove feature. The explosion-proof hole 14 is arranged on the second protrusion 13, so that when the pole core is supported on the first protrusion 12, the pole core can be arranged away from the groove bottom wall of the groove away from the accommodation cavity 11, thereby avoiding direct contact between the pole core and the explosion-proof hole 14, ensuring the communication of the explosion-proof hole 14, thereby avoiding the explosion-proof hole 14 being blocked by the pole core, ensuring that the inside of the battery structure can normally flow with the outside, and improving the safety performance of the battery structure.

[0039] In some embodiments, as shown in Figure 1 , Figure 2 and Figure 3 , the first protrusion 12 is arranged at the middle position of the bottom wall of the shell body 1 and is arranged away from the inner side wall of the shell body 1, and the first protrusion 12 and the inner side wall of the shell body 1 form an avoiding space 15. It can be understood that when the pole core is supported on the first protrusion 12, the pole core and the bottom wall where the first protrusion 12 is located can be separated by the avoiding space 15. Specifically, the avoiding space 15 can at least accommodate the transition R angle between the inner side wall and the bottom wall, the top surface of the first protrusion 12 is arranged at a right angle with the inner side wall of the shell body 1, thereby adapting to the angle between the bottom surface and the side surface of the pole core, thereby avoiding interference between the pole core and the R angle of the shell body 1, and avoiding short circuit phenomenon.

[0040] The first protrusion 12 is arranged in extension along a first direction, the second protrusion 13 and the groove on the second protrusion 13 are arranged in extension along a second direction, and the first protrusion 12 is formed with a notch on the two side surfaces along the second direction. The groove communicates with the avoiding space 15 through the notch, so that the electrolyte can flow in the avoiding space 15 and the groove on the second protrusion 13, and the communication between the inside and outside of the battery structure is further improved. Specifically, the notch can be directly formed by stamping or the like from the two side surfaces of the first protrusion 12 in the direction away from the inside of the shell body 1, and the present application does not limit this, which can be specifically arranged according to actual needs.

[0041] Wherein, the second direction intersects the first direction, and the second direction and the first direction are both perpendicular to the direction towards the inside of the shell body 1, as shown in Figure 3 , the first direction can be the length direction, and the second direction can be the width direction, as long as the first direction and the second direction can intersect, so that the groove on the second protrusion 13 can communicate with the avoiding space 15.

[0042] In practical implementation, further referring to Figures 1 to 3 As shown in the figure, the first convex part 12 comprises a plurality of spaced boss structures 121, and the second convex part 13 is located on one of the boss structures 121. It can be understood that the plurality of boss structures 121 are spaced apart from the inner side wall of the shell body 1 to avoid short circuit caused by interference when supporting the core together.

[0043] Further, referring to Figure 5 、 Figure 6 and Figure 8 As shown in the figure, a first exhaust channel 16 is formed between each adjacent boss structure 121, a groove formed on the second convex part 13 is a second exhaust channel 17, and an avoidance space 15 is formed between the boss structure 121 and the inner side wall of the shell body 1 at the opposite position. The first exhaust channel 16, the second exhaust channel 17 and the avoidance space 15 are in communication with each other, that is, the bottom wall of the first convex part 12, except for the first convex part 12 capable of abutting against the core, the remaining positions can be in communication with each other to avoid the core completely covering and blocking the explosion-proof hole 14, improve the safety performance of the core structure, and improve the explosion-proof effect.

[0044] It can be understood that the first exhaust channel 16, the second exhaust channel 17 and the avoidance space 15 can also form an electrolytic cavity for accommodating electrolyte to avoid affecting the volume of electrolyte due to the arrangement of the first convex part 12 and ensure the performance of the core structure.

[0045] In practical implementation, the arch height of the first convex part 12 is between 0.3mm and 0.5mm. It can be understood that the arch height of the first convex part 12 should be at least greater than or equal to 0.3mm to enable the avoidance space 15 between the first convex part 12 and the inner wall of the shell body 1 to accommodate the transition R angle between the adjacent walls inside the shell body 1, thereby avoiding interference between the core and the R angle of the shell body 1. Of course, the arch height of the first convex part 12 should also be less than or equal to 0.5mm to avoid the influence of the first convex part 12 with too high height on the internal space of the shell body 1, thereby ensuring that the core and the electrolyte have sufficient accommodation space and ensuring the overall performance of the core structure.

[0046] Further, the ratio of the area of the projection of the first protrusion 12 on the bottom wall in the direction towards the inside of the shell body 1 to the area of the bottom wall is between 20% and 90%, and correspondingly, the ratio of the area of the position on the bottom wall where the first protrusion 12 is located, except for the position where the first protrusion 12 can abut against the pole core, to the area of the bottom wall is between 10% and 80%. In this way, when the pole core is supported on the first protrusion 12, it can not only ensure that the pole core can be stably supported, but also can achieve effective heat dissipation through the contact area between the two, and at least 10% of the avoidance space 15 can be generated to ensure that the pole core does not interfere with the R angle inside the shell body 1, and the performance of the pole core is ensured.

[0047] In some embodiments, the side of the first protrusion 12 away from the accommodation cavity 11 is formed with a sunken groove, the groove bottom wall of the sunken groove is lower than the outer surface of the shell body 1 in the direction away from the shell body 1, the second protrusion 13 is arranged in the sunken groove, and the outer surface of the second protrusion 13 is lower than the outer surface of the shell body 1 or flush with the outer surface of the shell body 1 in the direction away from the inside of the shell body 1. It can be understood that the explosion-proof valve 2 is arranged in the explosion-proof hole 14 of the second protrusion 13, that is, the explosion-proof valve 2 does not exceed the outer surface of the second protrusion 13, so as not to exceed the outer surface of the shell body 1, thereby avoiding the explosion-proof valve 2 from being bumped or scratched, and ensuring the explosion-proof performance of the structure of the pole core.

[0048] In specific implementation, referring to Figure 6 As shown in the figure, the hole wall of the explosion-proof hole 14 is provided with a support portion 141 extending in the circumferential direction, and the explosion-proof valve 2 is arranged on the side of the support portion 141 facing the inside of the shell body 1. That is, the explosion-proof valve 2 can be limited by the support portion 141 to prevent the explosion-proof valve 2 from being pulled out of the explosion-proof hole 14 of the second protrusion 13, so that the explosion-proof valve 2 can be fixed relative to the second protrusion 13. Specifically, the support portion 141 can be arranged at the middle position of the explosion-proof hole 14 in the height direction, and the explosion-proof valve 2 does not contact the pole core, the liquid cooling plate or the gluing position, so as to avoid being pressed.

[0049] Continuing to refer to Figure 6 As shown in the figure, when the outer surface of the second protrusion 13 is lower than the outer surface of the shell body 1, and the explosion-proof valve 2 is arranged on the side of the support portion 141 facing the inside of the shell body 1, the explosion-proof valve 2 can form an avoidance space gap between the inner and outer surfaces of the shell body 1, so as to prevent the pole core or the external structural member from damaging the explosion-proof valve 2, and there is no need to additionally arrange a protection film for the explosion-proof valve.

[0050] In some embodiments, the shell body 1, the first protrusion 12 and the second protrusion 13 are stamped and formed as an integrated structure. Specifically, the shell body 1, the first protrusion 12 and the second protrusion 13 are aluminum shells with high thermal conductivity. When the pole core is supported on the first protrusion 12, the first protrusion 12 directly contacts the pole core for heat dissipation, the heat conduction path is short, and the heat dissipation capacity of the pole core shell can be enhanced, which is conducive to reducing the temperature rise of the pole core.

[0051] Of course, it should be noted that the shell body 1, the first protrusion 12 and the second protrusion 13 can also be structural parts made of other materials and formed in other ways. This application does not limit this and can be specifically set according to actual needs.

[0052] In some embodiments, refer to Figure 4 and Figure 7 As shown, a mounting opening for the electrode core to pass through is provided on one side wall of the casing body 1. A cover plate is provided at the mounting opening, and an electrode post is provided on the cover plate. A first protrusion 12 is formed on the side wall of the casing body 1 opposite to the cover plate. That is, the second protrusion 13 and the explosion-proof hole 14 on the second protrusion 13 are both arranged opposite to the cover plate and the electrode post on the cover plate. With this arrangement, in the event of a deflagration of the electrode core, the electrolyte can leak through the explosion-proof hole 14, avoiding damage to the electrode post and improving the safety performance of the cell structure.

[0053] Other embodiments of this application provide a battery cell structure including an electrode core and a battery cell housing as described in any of the above embodiments, wherein the electrode core is disposed in a receiving cavity 11 of the battery cell housing and supported on a first protrusion 12.

[0054] The battery cell structure provided in this application includes the battery cell casing of any of the above embodiments, and therefore has the beneficial effects of the battery cell casing of any of the above embodiments, which will not be repeated here.

[0055] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0056] The above are merely specific embodiments of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to these embodiments, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery cell housing, characterized in that, Includes the shell body (1); The shell body (1) has a receiving cavity (11) inside for accommodating the electrode core of the battery cell structure. At least a portion of the shell body (1) arches in the direction toward the interior of the shell body (1) and forms a first protrusion (12), which is used to support the electrode core. At least a portion of the first protrusion (12) is recessed in a direction away from the interior of the shell body (1) to form a second protrusion (13). The second protrusion (13) has a groove communicating with the receiving cavity (11) on the side facing the receiving cavity (11). An explosion-proof hole (14) communicating with the groove is provided on the second protrusion (13), and an explosion-proof valve (2) is provided in the explosion-proof hole (14).

2. The cell housing according to claim 1, characterized in that, The first protrusion (12) is located at the middle position of the bottom wall of the shell body (1) and is spaced apart from the inner side wall of the shell body (1). An avoidance space (15) is formed between the first protrusion (12) and the inner side wall of the shell body (1).

3. The cell housing according to claim 2, characterized in that, The first protrusion (12) extends along a first direction, and the second protrusion (13) and the groove on the second protrusion (13) extend along a second direction. The first protrusion (12) has notches on both sides along the second direction, and the groove communicates with the clearance space (15) through the notches. Wherein, the second direction intersects with the first direction, and both the second direction and the first direction are perpendicular to the direction toward the interior of the shell body (1).

4. The cell housing according to claim 3, characterized in that, The first protrusion (12) includes a plurality of spaced protrusion structures (121), the plurality of protrusion structures (121) are spaced apart, and the second protrusion (13) is located on one of the protrusion structures (121); A first exhaust channel (16) is formed between each adjacent boss structure (121), and a groove on the second protrusion (13) is formed as a second exhaust channel (17). A clearance space (15) is formed between the boss structure (121) and the inner sidewall of the shell body (1) at the opposite position. The first exhaust channel (16), the second exhaust channel (17) and the clearance space (15) are interconnected.

5. The cell housing according to claim 2, characterized in that, The arch height of the first protrusion (12) is between 0.3 mm and 0.5 mm; And / or, the area of ​​the projection of the first protrusion (12) onto the bottom wall in the direction toward the interior of the shell body (1) is in the ratio of the area of ​​the bottom wall to 20% to 90%.

6. The cell housing according to any one of claims 1 to 5, characterized in that, The first protrusion (12) has a groove formed on the side away from the receiving cavity (11), the second protrusion (13) is disposed in the groove, and the outer surface of the second protrusion (13) is lower than or flush with the outer surface of the shell body (1) in the direction away from the interior of the shell body (1).

7. The cell housing according to any one of claims 1 to 5, characterized in that, A support portion (141) is provided on the circumferentially extending wall of the explosion-proof hole (14), and the explosion-proof valve (2) is provided on the side of the support portion (141) facing the interior of the shell body (1).

8. The cell housing according to any one of claims 1 to 5, characterized in that, The shell body (1), the first protrusion (12) and the second protrusion (13) are stamped into an integral structure.

9. The cell housing according to any one of claims 1 to 5, characterized in that, The shell body (1) has an installation port on one side wall for the electrode core to pass through. The installation port is covered with a cover plate, and an electrode post is provided on the cover plate. The first protrusion (12) is formed on the side wall of the shell body (1) opposite to the cover plate.

10. A battery cell structure, characterized in that, It includes an electrode core and a cell housing as described in any one of claims 1 to 9, wherein the electrode core is disposed in a receiving cavity (11) of the cell housing and supported on the first protrusion (12).

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