Battery shell and battery

Abstract

The utility model relates to the technical field of batteries, in particular to a battery shell and a battery, the battery shell comprises a shell body, nicks are arranged on the shell body, and a plurality of communicated pressure relief areas are formed by the nicks. When the battery shell is applied and the internal pressure of the battery shell is too large, the pressure relief area can be broken to release the internal pressure of the battery shell, so that the safety of the battery is improved. The plurality of pressure relief areas are arranged along the pressure relief wall surface to form an array, so that pressure relief can be performed on a plurality of positions of the battery shell, the situation that the pressure relief of the battery shell is not timely is avoided, and the pressure relief capability of the battery shell is improved. When a certain pressure relief area is broken and is insufficient to release pressure, the adjacent pressure relief area can be broken to continue to release pressure. The pressure relief device can be well adapted to a long-size and large-size battery, and one or more pressure relief areas in a plurality of arranged pressure relief areas can relieve pressure at certain positions when the pressure at the certain positions in the long-size and large-size battery is too high.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to battery casings and batteries. Background Technology

[0002] In the context of the global push for electrification, batteries are being used more and more widely, especially in electric vehicles and energy storage systems, making battery safety a major concern. Battery pressure relief devices, typically located on the battery cover, are a crucial component for ensuring battery safety. They rupture to release pressure when internal pressure becomes excessive, preventing explosions. However, for batteries with elongated structures, due to their larger size and the fixed number and location of pressure relief devices, pressure delays can occur when excessive pressure is present in areas far from these devices. This pressure transmission takes time to reach the pressure relief devices on the cover, leading to a pressure relief delay and potential safety hazards. Therefore, designing a battery casing that effectively improves pressure relief capacity is a pressing issue in the field of battery manufacturing technology. Utility Model Content

[0003] In view of this, this application provides a battery casing and a battery, which are configured to form multiple continuous pressure relief zones, thereby effectively improving the pressure relief capacity of the battery casing.

[0004] In a first aspect, this application provides a battery casing, comprising: a casing body and a plurality of pressure relief areas; the casing body has a pressure relief wall surface, the plurality of pressure relief areas are disposed on the pressure relief wall surface, the plurality of pressure relief areas are interconnected, and the pressure relief areas are recessed into the surface of the casing body.

[0005] In conjunction with the first aspect, in one possible implementation, the housing body includes a first mating end and a second mating end. The first mating end has a first end and a second end, the first end and the second end forming a first mating notch. The second mating end has a third end and a fourth end, the third end and the fourth end forming a second mating notch. The third end is mated and connected in the first mating notch, and the second end is mated and connected in the second mating notch.

[0006] In conjunction with the first aspect, in one possible implementation, the housing body is integrally formed by stamping to create multiple pressure relief zones.

[0007] In conjunction with the first aspect, in one possible implementation, the length of the housing body is greater than or equal to 200 mm.

[0008] In conjunction with the first aspect, in one possible implementation, the array length of the plurality of pressure relief zones is any value between 30% and 95% of the length dimension of the housing body.

[0009] In conjunction with the first aspect, in one possible implementation, the pressure relief zone has at least one of the following shapes: circular, semi-circular, elliptical, polygonal, and a graphic comprising at least one curve.

[0010] In conjunction with the first aspect, in one possible implementation, the plurality of pressure relief zones have a plurality of pressure relief holes and / or a plurality of pressure relief grooves.

[0011] In conjunction with the first aspect, in one possible implementation, the pressure relief holes and the pressure relief grooves are arranged alternately, the array of multiple pressure relief zones has two pressure relief holes at both ends, and the two ends of the pressure relief grooves are respectively connected to the adjacent pressure relief holes.

[0012] In conjunction with the first aspect, in one possible implementation, the diameter of the pressure relief hole gradually increases along a first direction, the first direction being the direction from the geometric center of the pressure relief wall towards the edge of the pressure relief wall.

[0013] In conjunction with the first aspect, in one possible implementation, the diameter Φ of the pressure relief hole satisfies: 2mm ≤ Φ < d1, where d1 is the width of the pressure relief wall; the length L of the pressure relief groove satisfies: 2mm ≤ L ≤ d1; and the width M of the pressure relief groove satisfies: M < 2mm.

[0014] In conjunction with the first aspect, in one possible implementation, the first number of pressure relief holes is greater than or equal to 2, and the second number of pressure relief grooves is the first number minus one.

[0015] In conjunction with the first aspect, in one possible implementation, the relative distance d2 between the array ends of the plurality of pressure relief zones and the edge of the pressure relief wall surface satisfies: d2 ≥ d1, where d1 is the width dimension of the pressure relief wall surface.

[0016] In conjunction with the first aspect, in one possible implementation, the pressure relief area has a groove, the depth D of which satisfies: 55%*T≤D≤95%*T, where T is the thickness of the shell body.

[0017] Secondly, this application provides a battery, including: the aforementioned battery casing and a battery cell, wherein the battery cell is disposed in the battery casing.

[0018] This application eliminates the need for additional safety valves, saving on related safety valve manufacturing processes. When the internal pressure of the battery casing becomes excessive, the pressure relief zone can rupture to release the internal pressure, improving battery safety. Because multiple pressure relief zones are arranged in an array along the pressure relief wall, pressure can be relieved at multiple locations within the battery casing, preventing delayed pressure relief and improving the casing's pressure relief capacity. Furthermore, the multiple pressure relief zones are interconnected; if rupturing one zone is insufficient to release pressure, adjacent zones can rupture to continue relieving pressure. It is well-suited for long, large-volume batteries, helping to relieve pressure at specific locations within such batteries when excessive pressure occurs. Attached Figure Description

[0019] Figure 1 The diagram shown is a schematic diagram of the structure of a battery casing when unfolded according to an embodiment of this application.

[0020] Figure 2 As shown Figure 1 A magnified schematic diagram of part of the structure.

[0021] Figure 3 The image shown is an enlarged schematic of the scratch.

[0022] Figure 4 The diagram shows the structure of the welded area before assembly.

[0023] Figure 5 The diagram shown is a schematic of the structure after the welded parts are assembled. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0025] An example battery casing is shown below:

[0026] Figure 1 The diagram shown is a schematic diagram of the structure of a battery casing when unfolded according to an embodiment of this application. Figure 2 As shown Figure 1 A magnified schematic diagram of part of the structure. Figure 3 The image shown is an enlarged schematic of the scratch. Figure 4 The diagram shows the structure of the welded area before assembly. Figure 5 The diagram shown is a schematic of the structure after the welded parts are assembled.

[0027] This application provides a battery casing, in one embodiment, such as... Figure 1 As shown, the battery housing includes a housing body 1 and multiple pressure relief areas 2. The housing body 1 has a pressure relief wall 102, and the multiple pressure relief areas 2 are disposed on the pressure relief wall 102. The multiple pressure relief areas 2 are interconnected and are recessed into the surface of the housing body 1.

[0028] In this embodiment, no additional safety valve is required during application, saving on the related safety valve process. When the internal pressure of the battery casing is too high, the pressure relief zone 2 can be broken to release the internal pressure of the battery casing, improving battery safety. Since multiple pressure relief zones 2 are arranged in an array along the pressure relief wall 102, pressure can be relieved at multiple locations on the battery casing, avoiding untimely pressure relief and improving the pressure relief capacity of the battery casing. Furthermore, the multiple pressure relief zones 2 are interconnected, so if the pressure relief after one pressure relief zone 2 is broken is insufficient to release the pressure, adjacent pressure relief zones 2 can be broken to continue relieving pressure. It is well adapted to long and large-volume batteries, and helps to relieve pressure at certain locations inside long and large-volume batteries when the pressure is too high at certain locations. One or more of the multiple arranged pressure relief zones 2 can relieve pressure at these locations.

[0029] Specifically, such as Figure 4 and 5 The housing body 1 includes a first mating end 10 and a second mating end 11. The first mating end 10 has a first end 1001 and a second end 1002, which together form a first mating notch 1100. The second mating end 11 has a third end 1101 and a fourth end 1102, which together form a second mating notch 1200. The third end 1101 is mated and connected in the first mating notch 1100, and the second end 1002 is mated and connected in the second mating notch 1200. Figure 1 This is a schematic diagram of the unfolded state of the battery casing 1. The casing 1 is bent along the dashed crease 110 to form a cuboid battery casing. The first mating end 10 and the second mating end 11 are then joined together and welded using a laser welding machine. By seam welding the notch-type mating structure, the connection stability of the first mating end 10 and the second mating end after welding can be improved, thus enhancing the structural stability of the entire battery casing and increasing the yield rate of casing manufacturing. Using laser welding with seam welding technology can improve welding strength, ensure the sealing of the weld seam of the battery casing, and improve the yield rate of battery casing manufacturing.

[0030] In one embodiment, the first end 1001 has a first outer wall surface and a first welding surface, the second end 1002 has a second welding surface and a third welding surface, the third end 1101 has a second outer wall surface, a fourth welding surface and a fifth welding surface, and the fourth end 1102 has a sixth welding surface. After the first mating end 10 and the second mating end 11 are mated, the third end 1101 is matched and connected in the first mating notch 1100, and the second end 1002 is matched and connected in the second mating notch 1200. The first welding surface is mated with the fourth welding surface, the second welding surface is mated with the fifth welding surface, and the third welding surface is mated with the sixth welding surface. The first outer wall surface and the second outer wall surface are disposed on the same plane, forming the outer wall of the shell body 1.

[0031] In one embodiment, the length of the first end 1001 along the extension direction of the first docking end 10 is different from the length of the second end 1002 along the extension direction of the first docking end 10. Specifically, the first end 1001 and the second end 1002 have a length difference, and the first end 1001 and the second end 1002 constitute a stepped first docking end 10. The length of the third end 1101 along the extension direction of the second docking end 11 is different from the length of the fourth end 1102 along the extension direction of the second docking end 11. Specifically, the third end 1101 and the fourth end 1102 have a length difference, and the third end 1101 and the fourth end 1102 constitute a stepped second docking end 11. This application, through its stepped structural design, can prevent impurities from entering the interior of the battery casing when the welding device is welded from the outside of the battery casing.

[0032] Specifically, the length of the first end 1001 along the extension direction of the first mating end 10 is greater than the length of the second end 1002 along the extension direction of the first mating end 10; the length of the third end 1101 along the extension direction of the second mating end 11 is greater than the length of the fourth end 1102 along the extension direction of the second mating end 11.

[0033] In one embodiment, the housing body 1 has a bottom surface 103, which is located opposite to the pressure relief wall surface 102. At least one first mating end 10 and a second mating end 11 are disposed on the bottom surface 103. When assembling the battery housing body 1, by placing the first mating end 10 and the second mating end 11, which need to be welded, on the side farther away from the pressure relief area, damage to the pressure relief area 2 on the opposite side due to high temperature and vibration can be avoided during the welding operation of the first mating end 10 and the second mating end 11.

[0034] In one embodiment, the housing body 1 is integrally formed by stamping to create multiple pressure relief zones 2, which makes it easier and faster to manufacture multiple pressure relief zones 2, and can achieve better structural consistency, improve pressure relief stability and reliability, and ensure pressure relief effect.

[0035] In one embodiment, this application is applied to a long-size battery, which means that the length of the battery casing body 1 is greater than or equal to 200mm. This application can timely relieve pressure in various areas inside the battery casing by means of multiple pressure relief zones 2 arranged in an array.

[0036] In one embodiment, the array length of the plurality of pressure relief zones 2 is any value between 30% and 95% of the length of the housing body 1, that is, the array of pressure relief zones 2 is long enough to ensure that the pressure can be relieved in a timely manner in various areas inside the battery housing.

[0037] In one embodiment, the shapes of the plurality of pressure relief zones 2 include one or more of the following shapes: circular, semi-circular, elliptical, polygonal, and planar shapes including at least one curve. The various shapes in this embodiment can all be broken open and release pressure, thus achieving an effective pressure relief effect.

[0038] Multiple pressure relief zones 2 have multiple pressure relief holes 210 and / or multiple pressure relief grooves 220. In some embodiments, all pressure relief zones 2 are pressure relief holes 210; in some embodiments, all pressure relief zones 2 are pressure relief grooves 220; in some embodiments, some pressure relief zones 2 are pressure relief holes 210 and some pressure relief zones 2 are pressure relief grooves 220.

[0039] In one embodiment, such as Figure 2 As shown, multiple pressure relief zones 2 include circular pressure relief holes 210 and rectangular pressure relief grooves 220. The pressure relief holes 210 and pressure relief grooves 220 are arranged alternately, with two pressure relief holes 210 at each end of the array of multiple pressure relief zones 2, and the two ends of the pressure relief grooves 220 communicating with adjacent pressure relief holes 210. In this embodiment, the shape of the circular pressure relief holes 210 ensures uniform stress on the grooves 101 around the pressure relief holes 210, allowing for faster breaking. When the breaking of a pressure relief hole 210 is insufficient to release the internal pressure of the battery, the broken pressure relief hole 210 can tear apart the pressure relief groove 220 connected to it, and continue to break along the grooves 101 at the edge of the pressure relief groove 220 to the next pressure relief hole 210. This embodiment, by alternating the circular pressure relief holes 210 and rectangular pressure relief grooves 220, avoids the impact of consecutive pressure relief zones 2 of the same shape on the overall structural strength and rigidity of the casing body 1.

[0040] In one embodiment, the line connecting the geometric centers of the plurality of pressure relief zones 2 is located on the centerline of the width direction of the pressure relief wall 102. There are 14 pressure relief grooves 220 and 15 pressure relief holes 210. A 1mm thick AL3003 aluminum alloy sheet is selected and cut into 280mm*450mm sheets, as shown in the reference... Figure 1 The sheet material conforms to the unfolded dimensions and shape of the battery casing.

[0041] The battery casings fabricated above were tested and verified for valve opening pressure using a pneumatic pressure testing device with a maximum test pressure of 10 MPa and a test accuracy of 0.001 MPa. The stamping depth of the pressure relief hole 210 and the pressure relief groove 220 was adjusted to control the opening pressure between 0.5 MPa and 0.65 MPa. Battery casings prepared with different stamping dies were repeatedly tested and verified to ensure the stability and reliability of the pressure relief.

[0042] In one embodiment, such as Figure 1 As shown, the diameter of the pressure relief hole 210 gradually increases along the first direction S1, where the first direction S1 is the direction from the geometric center of the pressure relief wall 102 towards its edge. In this embodiment, the closer the pressure relief hole is to the geometric center of the pressure relief wall 102 along the first direction z, the weaker the structural strength and rigidity of the shell body 1. Therefore, limiting the pressure relief hole 210 to gradually increase along the first direction z, i.e., the smaller the size of the pressure relief hole 210 closer to the geometric center of the pressure relief wall 102, can effectively reduce the damage to the structural strength and rigidity of the shell body 1 caused by the continuous pressure relief zone 2.

[0043] In one embodiment, reference is made to Figure 2 The diameter Φ of the pressure relief hole 210 satisfies: Φ≥2mm, Φ<d1, where d1 is the width of the pressure relief wall 102. In this embodiment, Φ≥2mm ensures that the area of ​​the pressure relief hole 210 is large enough to effectively break through and relieve pressure; Φ<d1 prevents the size of the pressure relief hole 210 from being too large and affecting the strength of the pressure relief wall 102.

[0044] In one embodiment, the length L of the pressure relief groove 220 satisfies: 2mm ≤ L ≤ d1. The width M of the pressure relief groove 220 satisfies: M < 2mm. In this embodiment, the length L of the pressure relief groove 220 ≥ 2mm can prevent the pressure relief holes 210 on both sides of the pressure relief groove 220 from being too close, which can reduce the damage to the structural strength and rigidity of the shell body 1. The length L ≤ d1 of the pressure relief groove 220 can prevent the pressure relief groove 220 from being too long, that is, it can prevent the adjacent pressure relief holes 210 from breaking and failing to relieve pressure when one pressure relief hole 210 breaks. The length L of the two pressure relief grooves 220 separated by one pressure relief hole 210 can be the same or different.

[0045] In one embodiment, the first number of pressure relief holes 210 is greater than or equal to 2, and the second number of pressure relief grooves 220 is the first number minus one, so as to ensure that there is a sufficient number of pressure relief holes 210 to effectively relieve pressure.

[0046] In one embodiment, reference is made to Figure 2The relative distance d2 between the end of the array of multiple pressure relief zones 2 and the edge of the pressure relief wall 102 satisfies: d2≥d1, where d1 is the width of the pressure relief wall 102. In this embodiment, the relative distance d2≥d1 can prevent the pressure relief zones 2 at the ends from being too close to the pressure relief wall 102, and can effectively reduce the damage to the structural strength and rigidity of the shell body 1.

[0047] In one embodiment, reference is made to Figure 3 The pressure relief area 2 has a notch 101, which encloses and forms the pressure relief area 2. The depth D of the notch 101 satisfies: 55%*T ≤ D ≤ 95%*T, where T is the thickness of the shell body 1. In this embodiment, when applied, D ≥ 55%*T ensures that the depth of the notch 101 is sufficient, preventing the pressure relief area 2 from being difficult to break open. D ≤ 95%*T prevents the notch 101 from being too deep, thus avoiding the pressure relief area 2 becoming too fragile.

[0048] An example battery is shown below:

[0049] This application also provides a battery, which includes the aforementioned battery casing and battery cell, with the battery cell disposed in the battery casing.

[0050] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0051] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0052] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.

[0053] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features of the present invention.

[0054] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications or equivalent substitutions made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery casing, characterized in that, include: The shell body (1) and multiple pressure relief zones (2); The housing body (1) has a pressure relief wall surface (102), and a plurality of pressure relief areas (2) are disposed on the pressure relief wall surface (102). The plurality of pressure relief areas (2) are interconnected, and the pressure relief areas (2) are recessed into the surface of the housing body (1).

2. The battery case according to claim 1, wherein The housing body (1) includes a first docking end (10) and a second docking end (11). The first docking end (10) has a first end (1001) and a second end (1002). The first end (1001) and the second end (1002) form a first docking notch (1100). The second docking end (11) has a third end (1101) and a fourth end (1102). The third end (1101) and the fourth end (1102) form a second docking notch (1200). The third end (1101) is matched and connected in the first docking notch (1100), and the second end (1002) is matched and connected in the second docking notch (1200).

3. The battery case of claim 1, wherein, The housing body (1) is integrally formed by stamping to create multiple pressure relief zones (2).

4. The battery case of claim 1, wherein, The length of the shell body (1) is greater than or equal to 200 mm.

5. The battery case of claim 1, wherein, The array length of the plurality of pressure relief zones (2) is any value between 30% and 95% of the length dimension of the housing body (1).

6. The battery case of claim 1, wherein, The pressure relief area (2) has at least one of the following shapes: circular, semi-circular, elliptical, polygonal, and a graphic including at least one curve.

7. The battery case of claim 1, wherein, The plurality of pressure relief zones (2) have a plurality of pressure relief holes (210) and / or a plurality of pressure relief grooves (220).

8. The battery case of claim 7, wherein, The pressure relief holes (210) and pressure relief grooves (220) are arranged alternately, and the array of multiple pressure relief zones (2) has two pressure relief holes (210) at both ends. The two ends of the pressure relief grooves (220) are respectively connected to the adjacent pressure relief holes (210).

9. The battery casing according to claim 8, characterized in that, The diameter of the pressure relief hole (210) gradually increases along a first direction, which is the direction from the geometric center of the pressure relief wall (102) toward the edge of the pressure relief wall (102).

10. The battery casing according to claim 8, characterized in that, The diameter Φ of the pressure relief hole (210) satisfies: 2mm≤Φ<d1, where d1 is the width dimension of the pressure relief wall (102); The length L of the pressure relief groove (220) satisfies: 2mm≤L≤d1; The width M of the pressure relief groove (220) satisfies: M < 2 mm.

11. The battery casing according to claim 8, characterized in that, The first number of pressure relief holes (210) is greater than or equal to 2, and the second number of pressure relief grooves (220) is the first number minus one.

12. The battery casing according to claim 1, characterized in that, The relative distance d2 between the array ends of the plurality of pressure relief zones (2) and the edge of the pressure relief wall (102) satisfies: d2≥d1, where d1 is the width dimension of the pressure relief wall (102).

13. The battery casing according to claim 1, characterized in that, The pressure relief zone (2) has a notch (101), the depth D of which satisfies: 55%*T≤D≤95%*T, where T is the thickness of the shell body (1).

14. A battery, characterized by include: Battery casing as described in any one of claims 1 to 13; The battery cell is housed within the battery casing.

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