Battery shell, battery monomer and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery shell, a battery monomer and a battery pack, the battery shell comprises a peripheral side wall and a bottom wall, the bottom wall is connected with one end of the peripheral side wall to form a containing cavity with an opening, the bottom wall is provided with a groove, the bottom wall and the groove are integrally formed in a stamping or stretching mode, and the bottom wall and the groove are arranged in the containing cavity. The number of the grooves is at least two, and all the grooves are distributed around the center of the bottom wall at equal angles at intervals. An anti-explosion line is arranged on the groove bottom face of at least one groove. The at least two grooves are formed in the bottom wall, and all the grooves are distributed around the center of the bottom wall at equal angles at intervals, so that stress and material feeding are more uniform in the stamping or stretching forming process, the size of each part is more uniform, the strength of the battery shell is more uniform, and the service life of the battery shell is prolonged. And the explosion value of the explosion-proof valve formed by the groove and the explosion-proof line is more stable.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery shell, a battery cell and a battery pack. Background Art

[0002] In the prior art, the primary method for preventing explosions from battery failure is to install an explosion-proof valve at the bottom of the battery casing. When the battery fails and generates gas, the explosion-proof valve ruptures, releasing the gas within the battery casing to reduce the internal pressure and prevent the battery from exploding. However, currently, if a single explosion-proof valve is installed at the bottom of the battery casing, the force and material flow will be uneven during the integrated stamping or stretching process, resulting in uneven dimensions and strength of the formed battery casing. This can easily cause the battery casing to crack during the pressure relief process, and the explosion value is not stable. Utility Model Content

[0003] The purpose of the utility model is to provide a battery shell to solve the problems of uneven size and unstable explosion value of the battery shell caused by uneven force and material flow during the current explosion-proof valve integrated stamping or stretching process.

[0004] In a first aspect, the present application further provides a battery housing, comprising a peripheral side wall and a bottom wall, wherein the bottom wall is connected to one end of the peripheral side wall to form a receiving cavity with an opening, and the bottom wall is provided with a groove, the number of the grooves being at least two, and all the grooves being distributed at equal angles around the center of the bottom wall;

[0005] An explosion-proof line is provided on the bottom surface of at least one of the grooves.

[0006] In one embodiment, the bottom surface of at least one of the grooves is not provided with an explosion-proof line.

[0007] In one embodiment, the bottom wall has a first surface and a second surface opposite to each other, wherein the surface of the bottom wall facing the peripheral side wall is the first surface;

[0008] The groove is provided on the first surface and is recessed toward the second surface; or, the groove is provided on the second surface and is recessed toward the first surface.

[0009] In one embodiment, the number of the grooves is three, and the angle between two adjacent grooves is 120°.

[0010] In one embodiment, the groove is elliptical, and the major axis of the ellipse is arranged along the radial direction of the peripheral side wall.

[0011] In one embodiment, in the radial direction of the peripheral side wall, the distance from one end of the explosion-proof wire close to the peripheral side wall to the outer wall surface of the peripheral side wall is L mm, and L≤5.0.

[0012] In a second aspect, the present application also provides a battery cell comprising the battery housing as described above.

[0013] In a third aspect, the present application also provides a battery pack comprising a plurality of battery cells as described above.

[0014] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0015] By providing at least two grooves on the bottom wall, and all the grooves are distributed at equal angles around the center of the bottom wall, the force and material flow of the bottom wall and the grooves during the integrated stamping or stretching process are more uniform, thereby making the size of each part more uniform, and the strength of the battery casing more uniform, avoiding the battery casing from being cracked during the pressure relief process. In addition, the explosion value of the explosion-proof valve composed of the grooves and the explosion-proof wire can be more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings herein are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present invention, and together with the description, serve to explain the principles of the present invention.

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0018] In the attached figure:

[0019] Figure 1 is a cross-sectional view of a battery casing of the present application;

[0020] Figure 2 This is a structural schematic diagram of an embodiment of a battery housing of the present application;

[0021] Figure 3 This is a schematic structural diagram of another embodiment of a battery housing of the present application;

[0022] Figure 4 This is a schematic structural diagram of a bottom wall of a battery housing of the present application;

[0023] Figure 5 This is a schematic diagram of a battery housing of the present application having a groove provided on a first surface;

[0024] Figure 6This is a schematic diagram of a battery housing of the present application having a groove disposed on the second surface.

[0025] Figure Number:

[0026] 10. Battery housing; 11. Side wall; 12. Bottom wall; 12a. First surface; 12b. Second surface; 20. Groove; 30. Accommodation cavity; 40. Explosion-proof wire. DETAILED DESCRIPTION

[0027] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings and are constructed and operated in specific directions. They are only for the convenience of describing the present technical solution and do not indicate that the devices or components referred to must have specific directions. Therefore, they should not be understood as limiting the present invention.

[0028] It should also be noted that, unless otherwise clearly specified and limited, terms such as "installed", "connected", "connected", "fixed", and "set" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intervening elements. The terms "first", "second", and "third" are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", and "third" can explicitly or implicitly include one or more of the features. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0029] In the following description, specific details such as specific system structures and techniques are provided for purposes of illustration, not limitation, to facilitate a thorough understanding of the embodiments of the present invention. However, it will be apparent to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid obscuring the description of the present invention with unnecessary detail.

[0030] In the present application, an explosion-proof wire 40 is provided on the bottom surface of the groove 20 to form an explosion-proof valve consisting of the groove 20 and the explosion-proof wire 40. Furthermore, the explosion-proof wire 40 described below is an indentation formed by pressing during the manufacturing process. Its function is to rupture and release the gas inside the battery when an abnormal condition occurs in the battery (e.g., overcharging, short circuit, continuous heating to thermal runaway, etc.), thereby helping to relieve the internal pressure of the battery and prevent the battery from exploding or catching fire.

[0031] Example 1

[0032] Please refer to Figure 1 and Figure 2 The present application also provides a battery housing 10, which includes a peripheral side wall 11 and a bottom wall 12. The bottom wall 12 is connected to one end of the peripheral side wall 11 to form an accommodating cavity 30 with an opening. The bottom wall 12 is provided with a groove 20. There are at least two grooves 20, and all grooves 20 are distributed at equal angles around the center of the bottom wall 12. The bottom surface of at least one groove 20 is provided with an explosion-proof wire 40.

[0033] In this embodiment, at least two grooves 20 are provided on the bottom wall 12, and all the grooves 20 are distributed at equal angles around the center of the bottom wall 12, so that the force is more uniform during the stamping or stretching process, and the size of each part is more uniform, so that the strength of the battery casing is more uniform, and the explosion value of the explosion-proof valve composed of the grooves 20 and the explosion-proof line 40 is more stable.

[0034] It should be noted that the shape of the explosion-proof wire 40 can also be arc-shaped, elliptical ring-shaped, C-shaped, U-shaped, semicircular or other shapes that can play a pressure relief role. This application does not limit its shape and size.

[0035] Here, it should be noted that the provision of an explosion-proof line 40 on the bottom surface of at least one groove 20 can mean that the bottom surfaces of all grooves 20 are provided with an explosion-proof line 40, or it can mean that only the bottom surfaces of some grooves 20 are provided with an explosion-proof line 40. In other words, if the bottom surfaces of all grooves 20 are provided with an explosion-proof line 40, multiple explosion-proof valves can be formed on the bottom wall 12. When the battery is depressurized, the gas can break through the multiple explosion-proof valves, which is conducive to the rapid discharge of the gas generated in the battery housing 10 and can achieve a better pressure relief effect. If the bottom surfaces of only some grooves 20 are provided with an explosion-proof line 40, the grooves 20 without the explosion-proof line 40 can be used for welding to the collecting plate or for other purposes.

[0036] In addition, the above-mentioned "at least two" refers to two or more, which can be determined according to the actual situation. For example, in one embodiment, referring to Figure 3 There are two grooves 20 , and the two grooves 20 are symmetrically arranged on the bottom wall 12 .

[0037] In another embodiment, referring to Figure 2 The number of grooves 20 is three, and all grooves 20 are spaced apart around the center of the bottom wall 12, with the angle between adjacent grooves 20 being 120°. This ensures more uniform stress and material flow during the molding process, thereby making the dimensions of each part more uniform, thereby ensuring more stable strength of the battery housing and the explosion-proof valve formed by the grooves 20 and explosion-proof wire 40.

[0038] In one embodiment, the bottom wall 12 and the peripheral side walls 11 may be an integral piece or separate pieces. That is, the bottom wall 12 and the peripheral side walls 11 may be formed using an integral molding process, or the bottom wall 12 and the peripheral side walls 11 may form two separate structures, that is, the bottom wall 12 and the peripheral side walls 11 may be formed separately and then connected to form the battery housing 10.

[0039] Specifically, in this embodiment, the battery housing 10 is formed by a stamping or drawing process, and the bottom wall 12 and the peripheral side wall 11 are integrally formed. The connection between the peripheral side wall 11 and the bottom wall 12 can be omitted, thereby ensuring the structural strength of the battery housing 10. In addition, the battery housing of this embodiment is made of aluminum, but is not limited thereto.

[0040] Reference Figure 4 In one embodiment, the bottom wall 12 has a first surface 12a and a second surface 12b that are opposite each other. The surface of the bottom wall 12 facing the peripheral sidewall 11 is the first surface 12a, and the surface of the bottom wall 12 facing away from the peripheral sidewall 11 is the second surface 12b. Specifically, after the bottom wall 12 and the peripheral sidewall 11 are connected to form the housing, the first surface 12a of the bottom wall 12 specifically serves as the bottom surface of the housing's accommodating cavity 30, and the second surface 12b of the bottom wall 12 specifically serves as the outer bottom surface of the housing.

[0041] In one embodiment, reference Figure 5 The groove 20 is provided on the first surface 12a and is recessed toward the second surface 12b. Thus, when the battery is depressurized, the gas can more easily break through the explosion-proof valve, allowing the gas to escape quickly from the battery housing.

[0042] In other embodiments, referring to Figure 6 The groove 20 is provided on the second surface 12b and is recessed toward the first surface 12a. Thus, when the battery is bumped, it will first hit the second surface 12b of the bottom wall 12 and is less likely to hit the explosion-proof valve, ensuring a highly reliable battery structure.

[0043] In one embodiment, the groove 20 is elliptical, and the major axis of the ellipse is arranged along the radial direction of the peripheral side wall 11. In actual application, since the material at the bottom wall 12 is moved radially (radially) from its center along the peripheral side wall 11 during the molding process, the recessed part of the groove will hinder the material movement. The wider the groove is in the direction perpendicular to the radial direction of the peripheral side wall 11, the more serious the material obstruction is. When the major axis of the ellipse is arranged along the radial direction of the peripheral side wall 11, the material obstruction of the elliptical groove is less under the same explosion-proof valve area. The explosion-proof valve of this structure is easier to mold, and the size distribution after molding is more uniform. In addition, it can be understood that during the processing of the groove 20, due to the existence of processing errors, the groove 20 is not an absolute ellipse. Among them, the situation where the groove 20 is similar to an ellipse also falls within the scope of protection of this application.

[0044] For example, the shape of the groove 20 can also be annular. For example, if the groove 20 is an annular shape connected end to end, in which case the bottom surface of the groove 20 is annular; or if the groove 20 is C-shaped, in which case the bottom surface of the groove 20 is C-shaped. When the groove 20 is annular or C-shaped and the explosion-proof wire 40 is also annular or C-shaped, as one implementation method, the width of the groove bottom of the former is the same as the width of the groove opening of the latter. The specific shape of the groove 20 is not limited in this application.

[0045] In one embodiment, in the groove 20 provided with an explosion-proof valve, there is one explosion-proof line 40, which is arranged around the center of the groove 20 to form a larger explosion-proof valve on the bottom surface of the groove 20, which is conducive to accelerating the discharge of gas inside the battery casing 10.

[0046] Reference Figure 6 In one embodiment, the distance between the end of the explosion-proof wire 40 closest to the peripheral side wall 11 and the peripheral side wall 11 is L, where L is ≤ 5.0 mm. This allows the explosion-proof wire 40 to be relatively close to the peripheral side wall 11. When the battery pressure is released, the pressure on the peripheral side wall 11 is relatively small, effectively preventing the peripheral side wall 11 or its associated locations from cracking.

[0047] In other embodiments, in the groove 20 provided with the explosion-proof valve, the number of explosion-proof lines 40 is two or more, and the bottom surface of the groove 20 is divided into several blasting areas. In this way, the blasting effect can be adjusted according to actual explosion-proof requirements.

[0048] Example 2

[0049] Based on the above-mentioned battery housing 10 , the present invention further provides a single battery, which includes the battery housing 10 of the above-mentioned embodiment 1.

[0050] It is understandable that the battery cell of the embodiment of the present application includes the technical features and technical effects of the aforementioned battery housing 10, which will not be repeated here.

[0051] Example 3

[0052] Based on the above-mentioned single battery, the present invention also provides a battery pack, which includes a plurality of the above-mentioned single batteries, wherein the plurality of single batteries can be connected in series or in parallel, without limitation.

[0053] It can be understood that the battery pack of the embodiment of the present application includes the technical features and technical effects of the aforementioned single battery, which will not be repeated here.

[0054] It can be understood that the above embodiments only express the preferred implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the present invention. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, all of which fall within the scope of protection of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of coverage of the claims of the present invention.

Claims

1. A battery casing, characterized in that: The invention comprises a peripheral side wall (11) and a bottom wall (12), wherein the bottom wall (12) is connected to one end of the peripheral side wall (11) to form a receiving cavity (30) with an opening, and the bottom wall (12) is provided with grooves (20), the number of the grooves (20) is at least two, and all the grooves (20) are distributed at equal angles around the center of the bottom wall (12); An explosion-proof line (40) is provided on the bottom surface of at least one of the grooves (20).

2. The battery housing according to claim 1, wherein: The bottom surface of at least one of the grooves (20) is not provided with an explosion-proof line (40).

3. The battery housing according to claim 1, wherein: The bottom wall (12) has a first surface (12a) and a second surface (12b) opposite to each other, wherein the surface of the bottom wall (12) facing the peripheral side wall (11) is the first surface (12a); The groove (20) is provided on the first surface (12a) and is recessed toward the second surface (12b); or, the groove (20) is provided on the second surface (12b) and is recessed toward the first surface (12a).

4. The battery housing according to claim 1, wherein: The number of the grooves (20) is three, and the angle between two adjacent grooves (20) is 120°.

5. The battery housing according to claim 1, wherein: The groove (20) is elliptical, and the major axis of the ellipse is arranged along the radial direction of the peripheral side wall (11).

6. The battery housing according to claim 1, wherein: In the radial direction of the peripheral side wall (11), the distance from one end of the explosion-proof wire (40) close to the peripheral side wall (11) to the outer wall surface of the peripheral side wall (11) is L mm, and L≤5.

0.

7. A battery cell, characterized in that: The invention comprises a battery housing, wherein the battery housing is the battery housing according to any one of claims 1 to 6.

8. A battery pack, characterized in that: The device comprises a plurality of battery cells as claimed in claim 7.

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