A battery shell, a battery and an electronic device

Abstract

The application discloses a battery shell, a battery and an electronic device. The battery shell comprises a side wall, a bottom wall connected with one end of the side wall, and an anti-explosion groove formed on the bottom wall by a rotary cutting process. The anti-explosion groove has a semicircular cross section and a whole annular profile. The bottom wall of the battery shell provided by the application forms the anti-explosion groove, the cross section of the anti-explosion groove is semicircular, and the profile is annular. Under the action of pressure, the anti-explosion groove is uniformly broken or deformed, so that the internal gas can be rapidly and stably released, the battery explosion caused by excessive pressure is avoided, and the safety of the battery use is remarkably improved.

Description

Technical Field

[0001] This application relates to the field of energy storage device technology, and more specifically, to a battery casing, a battery, and an electronic device. Background Technology

[0002] During charging and discharging, batteries may generate a large amount of heat and gas due to the complexity of their internal chemical reactions. If this heat and gas cannot be released effectively and in a timely manner, the internal pressure of the battery will rise sharply. When the pressure exceeds the tolerance limit of the battery casing, it may cause serious safety accidents such as battery explosion or fire.

[0003] Currently, to improve battery safety and prevent explosions, the industry has implemented several measures to enhance battery casing design. Common methods include incorporating explosion-proof valves or vents into the battery casing. However, existing explosion-proof valve and vent technologies have several significant shortcomings. Explosion-proof valves require sophisticated material selection and manufacturing processes, resulting in relatively high costs. Furthermore, the burst pressure of explosion-proof valves is difficult to control precisely, potentially leading to instability due to slight differences in material properties or fluctuations in manufacturing processes, thus affecting battery safety. Additionally, the bursting of an explosion-proof valve can generate fragments that may enter the battery, damaging critical components such as electrodes and further exacerbating battery failure. Existing explosion-proof vents are typically manufactured using simple processes like stamping, making precise control of their shape and size difficult, resulting in inconsistent pressure relief.

[0004] In view of this, it is necessary to propose a new technical solution to solve the above-mentioned technical problems. Utility Model Content

[0005] One objective of this application is to provide a new technical solution for a battery casing, a battery, and an electronic device.

[0006] According to a first aspect of this application, a battery housing is provided, the battery housing comprising:

[0007] Sidewall;

[0008] The bottom wall is connected to one end of the side wall; the bottom wall is formed with an explosion-proof groove by a rotary cutting process, and the cross-sectional shape of the explosion-proof groove is semi-circular and its overall outline is annular.

[0009] Optionally, the overall outline of the explosion-proof groove is semi-circular or circular.

[0010] Optionally, the center of the explosion-proof groove outline coincides with the geometric center of the bottom wall.

[0011] Optionally, the bottom wall is circular, and the shortest distance D from the outer wall of the explosion-proof groove to the edge of the bottom wall satisfies: 2 / 5R≤D≤4 / 5R, where R is the radius of the explosion-proof groove.

[0012] Optionally, the maximum depth of the explosion-proof groove is 30%-80% of the total thickness of the bottom wall.

[0013] Optionally, the maximum depth of the explosion-proof groove is 50%-70% of the total thickness of the bottom wall.

[0014] Optionally, the explosion-proof groove is disposed on the inner or outer side of the bottom wall.

[0015] Optionally, the bottom wall is made of steel.

[0016] According to a second aspect of this application, a battery is provided, the battery including a battery casing as described in the first aspect, and further including a cap and a core, the cap being connected to the other end of the sidewall, the cap and the battery casing enclosing an accommodating space, and the core being disposed within the accommodating space.

[0017] According to a third aspect of this application, an electronic device is provided, the electronic device comprising a battery as described in the second aspect.

[0018] According to one embodiment of the battery casing provided in this application, when the battery generates a large amount of gas and heat due to internal chemical reactions during charging and discharging, causing a sharp increase in internal pressure, the explosion-proof groove can play a crucial pressure relief role. Because its cross-section is semi-circular and its outline is annular, under pressure, the explosion-proof groove will uniformly rupture or deform, allowing the internal gas to be released quickly and smoothly, preventing the battery from exploding due to excessive pressure, thereby significantly improving the safety of battery use.

[0019] Other features and advantages of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present application and, together with their description, serve to explain the principles of the present application.

[0021] Figure 1 This is a cross-sectional structural schematic diagram of a battery casing according to an embodiment of this application.

[0022] Figure 2 This is a schematic diagram of the outline shape of the explosion-proof groove in the battery casing according to an embodiment of this application. Figure 1 .

[0023] Figure 3This is a schematic diagram of the outline shape of the explosion-proof groove in the battery casing according to an embodiment of this application. Figure 2 .

[0024] Figure 4 This is a cross-sectional structural diagram of a battery according to an embodiment of this application.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Battery casing; 10. Side wall; 11. Bottom wall; 110. Explosion-proof groove; 2. Cap. Detailed Implementation

[0027] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0028] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0029] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0030] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0032] Reference Figures 1-4 As shown, according to one embodiment of this application, a battery casing 1 is provided. The battery casing 1 includes: a side wall 10; a bottom wall 11, the bottom wall 11 being connected to one end of the side wall 10; the bottom wall 11 is formed with an explosion-proof groove 110 by a rotary cutting process, the explosion-proof groove 110 having a semi-circular cross-sectional shape and its overall outline being annular.

[0033] In this embodiment, the battery casing 1 mainly consists of two parts: a side wall 10 and a bottom wall 11. The side wall 10 and the bottom wall 11 cooperate with each other to provide a space for housing and protecting the battery cells, electrolyte, and other components inside the battery. The bottom wall 11 is connected to one end of the side wall 10, and the two together form a semi-enclosed casing structure (if there are openings for electrode leads, etc.) to ensure that the components inside the battery can be stably placed inside, and to a certain extent prevent external environmental factors (such as moisture, dust, etc.) from affecting the inside of the battery.

[0034] An explosion-proof groove 110 is formed on the bottom wall 11, specifically through a rotary cutting process. For example, a special die is used to directionally machine the explosion-proof groove 110. This special die is a diamond circular grinding tool. The diamond circular grinding tool forms the explosion-proof groove 110 on the bottom wall 11 through high-speed rotation. When rotating at high speed, the diamond circular grinding tool can cut the material of the bottom wall 11 with extremely high precision and stability. The high-speed rotation of the diamond circular grinding tool generates cutting force, precisely etching the shape of the explosion-proof groove 110 onto the bottom wall 11.

[0035] Rotary cutting is a process that uses the relative motion between a rotating workpiece (a special die) and a fixed workpiece (the battery casing) to cut the material of the fixed workpiece (part of the battery's bottom wall) into a specific shape. Through rotary cutting, the explosion-proof groove 110 can be accurately manufactured on the bottom wall 11 according to a predetermined design. Compared to other processing methods, rotary cutting can achieve higher precision and more complex shape processing. Compared to laser forming, it can improve processing efficiency and reduce costs.

[0036] An explosion-proof groove 110 is formed on the bottom wall 11, and the cross-sectional shape of the explosion-proof groove 110 is semi-circular. When the internal pressure of the battery rises abnormally, the semi-circular cross-section allows the explosion-proof groove 110 to deform more evenly under stress, avoiding stress concentration and thus more reliably achieving the pressure relief function. The overall outline of the explosion-proof groove 110 is annular. The annular outline design allows the explosion-proof groove 110 to be distributed around a specific area of ​​the bottom wall 11. When the internal pressure of the battery reaches a certain level, the pressure can be released from all directions, improving the efficiency and uniformity of pressure relief and effectively reducing the risk of battery explosion due to excessive local pressure.

[0037] For example, the explosion-proof groove 110 is provided on the inner or outer side of the bottom wall 11. That is, the explosion-proof groove 110 can be provided on the side of the bottom wall 11 near the side wall 10, or it can be provided on the side of the bottom wall 11 away from the side wall 10.

[0038] For example, the bottom wall 11 is made of steel. For instance, the battery casing 1 is made of steel.

[0039] In this embodiment, when the battery generates a large amount of gas and heat due to internal chemical reactions during charging and discharging, causing a sharp increase in internal pressure, the explosion-proof groove 110 plays a crucial pressure-relieving role. Because of its semi-circular cross-section and annular outline, under pressure, the explosion-proof groove 110 will uniformly rupture or deform, allowing the internal gas to be released quickly and smoothly, preventing the battery from exploding due to excessive pressure, thereby significantly improving battery safety. Furthermore, the semi-circular cross-sectional shape allows the explosion-proof groove 110 to uniformly distribute stress when subjected to pressure, reducing localized stress concentration. This helps improve the structural strength and stability of the explosion-proof groove 110 itself, making it less prone to damage under normal operating conditions and ensuring the overall structural integrity of the battery casing 1.

[0040] In the embodiments of this application, reference is made to Figure 2 and Figure 3 The overall outline of the explosion-proof groove 110 is semi-circular or circular.

[0041] In one example, refer to Figure 3 The explosion-proof groove 110 has an overall semi-circular outline. However, the outline of the explosion-proof groove 110 is not a complete circle, but rather resembles a semi-circular arc shape formed by cutting a circle along a certain diameter, surrounding a certain area. This type of explosion-proof groove 110 is provided in a local area of ​​the bottom wall 11 of the battery casing 1, for example, forming a semi-circular groove structure only on one side of the bottom wall 11 or within a specific angle range.

[0042] The explosion-proof groove 110 has a semi-circular outline, which allows for precise local pressure relief. For example, near the battery electrodes, the electrochemical reaction is relatively intense, which may generate a lot of gas and heat. By placing the semi-circular explosion-proof groove 110 in the bottom wall 11 area corresponding to the electrode, the pressure accumulated in this area can be released in a timely manner, preventing the electrode from deforming or being damaged due to excessive pressure.

[0043] In another example, refer to Figure 2 The explosion-proof groove 110 has a complete circular outline, forming a closed ring around the center or a specific location of the bottom wall 11. This type of explosion-proof groove 110 can be distributed omnidirectionally around the bottom wall 11, allowing pressure to be released from all directions when the internal pressure of the battery is abnormal, achieving omnidirectional and uniform pressure relief.

[0044] In the embodiments of this application, reference is made to Figure 2 and Figure 3 The center of the outline of the explosion-proof groove 110 coincides with the geometric center of the bottom wall 11.

[0045] In this embodiment, the explosion-proof groove 110 is substantially centered on the bottom wall 11. Since the center of the outline of the explosion-proof groove 110 coincides with the geometric center of the bottom wall 11, the explosion-proof groove 110 can be evenly distributed around the core area of ​​the battery's internal pressure. Thus, when the pressure reaches the opening threshold of the explosion-proof groove 110, gas can be evenly released from all directions of the explosion-proof groove 110, avoiding the risk of localized rupture or explosion of the battery casing 1 due to localized pressure concentration, and improving the battery's safety under extreme conditions.

[0046] In the embodiments of this application, reference is made to Figure 2 and Figure 3 The bottom wall 11 is circular, and the shortest distance D from the outer wall of the explosion-proof groove 110 to the edge of the bottom wall 11 satisfies: 2 / 5R≤D≤4 / 5R, where R is the radius of the explosion-proof groove 110.

[0047] In this embodiment, D is a parameter that measures the position of the explosion-proof groove 110 on the bottom wall 11, reflecting the distance of the explosion-proof groove 110 from the edge of the bottom wall 11. By limiting this range of values, the relative position of the explosion-proof groove 110 on the circular bottom wall 11 is precisely controlled.

[0048] Limiting D to the range of 2 / 5R≤D≤4 / 5R ensures that the explosion-proof slot 110 is in a suitable position, allowing the internal pressure of the battery to be released evenly and effectively through the explosion-proof slot 110.

[0049] If D is too small, that is, the explosion-proof groove 110 is too close to the edge of the bottom wall 11, when the pressure is released, the edge of the bottom wall 11 may be subjected to excessive local force, which may easily cause the edge of the bottom wall 11 to crack, thereby affecting the overall structural integrity of the battery casing 1, and may even lead to leakage of internal battery materials, causing more serious safety accidents.

[0050] If D is too large, the explosion-proof groove 110 will be far from the edge of the bottom wall 11. During the pressure release process, the path for pressure to be transmitted to the explosion-proof groove 110 will be longer, which may lead to untimely pressure release, causing the internal pressure of the battery to continue to rise, increasing the risk of battery explosion.

[0051] In the embodiments of this application, reference is made to Figure 1 The maximum depth of the explosion-proof groove 110 is 30%-80% of the total thickness of the bottom wall 11.

[0052] In this embodiment, the maximum depth of the explosion-proof groove 110 is set to 30%-80% of the total thickness of the bottom wall 11, which ensures that the explosion-proof groove 110 can reliably function when the pressure reaches the dangerous threshold.

[0053] If the depth of the explosion-proof groove 110 is too shallow, less than 30% of the total thickness of the bottom wall 11, the explosion-proof groove 110 may not be able to rupture or open in time when the internal pressure of the battery increases, resulting in the inability to effectively release the pressure, and the internal pressure of the battery will continue to rise, increasing the risk of explosion.

[0054] If the explosion-proof groove 110 is too deep, exceeding 80% of the total thickness of the bottom wall 11, the explosion-proof groove 110 may prematurely rupture during normal battery operation due to slight mechanical stress or minor fluctuations in internal pressure, causing the battery to lose its explosion-proof protection function. It may also affect the overall structural strength and sealing of the battery casing 1. Preferably, the maximum depth of the explosion-proof groove 110 is 50%-70% of the total thickness of the bottom wall 11. For example, the maximum depth of the explosion-proof groove 110 is 55%, 60%, or 65% of the total thickness of the bottom wall 11.

[0055] According to another embodiment of this application, refer to Figure 4 A battery is provided, the battery including a battery casing 1 as described above, a cap 2 and a winding core, the cap 2 being connected to the other end of the side wall 10, the cap 2 and the battery casing 1 enclosing a receiving space, and the winding core being disposed within the receiving space.

[0056] The battery provided in this application embodiment uses a battery casing 1 with an explosion-proof groove 110, which can release pressure in time through the explosion-proof groove 110 when the internal pressure of the battery is too high, thereby improving the overall safety and reliability of the battery, extending the battery's service life, and making it suitable for various devices and scenarios that require battery power.

[0057] According to yet another embodiment of this application, an electronic device is provided, the electronic device including the battery as described above.

[0058] The electronic device provided in this application embodiment has high safety because it includes the battery with the above-mentioned safe and reliable explosion-proof pressure relief function; thereby reducing safety accidents caused by battery failure and ensuring user safety.

[0059] For example, electronic devices include, but are not limited to, headphones, smartwatches, and mobile phones.

[0060] The above embodiments mainly describe the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. For the sake of brevity, they will not be elaborated here.

[0061] While specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this application. The scope of this application is defined by the appended claims.

Claims

1. A battery casing, characterized in that, The battery casing includes: Side wall (10); The bottom wall (11) is connected to one end of the side wall (10); the bottom wall (11) is formed with an explosion-proof groove (110) by a rotary cutting process, and the cross-sectional shape of the explosion-proof groove (110) is semi-circular and its overall outline is annular.

2. The battery casing according to claim 1, characterized in that, The overall outline of the explosion-proof groove (110) is semi-circular or circular.

3. The battery casing according to claim 1 or 2, characterized in that, The center of the outline of the explosion-proof groove (110) coincides with the geometric center of the bottom wall (11).

4. The battery casing according to claim 1, characterized in that, The bottom wall (11) is circular, and the shortest distance D from the outer wall of the explosion-proof groove (110) to the edge of the bottom wall (11) satisfies: 2 / 5R≤D≤4 / 5R, where R is the radius of the explosion-proof groove (110).

5. The battery casing according to claim 1, characterized in that, The maximum depth of the explosion-proof groove (110) is 30%-80% of the total thickness of the bottom wall (11).

6. The battery casing according to claim 5, characterized in that, The maximum depth of the explosion-proof groove (110) is 50%-70% of the total thickness of the bottom wall (11).

7. The battery casing according to claim 1, characterized in that, The explosion-proof groove (110) is located on the inner or outer side of the bottom wall (11).

8. The battery casing according to claim 1, characterized in that, The bottom wall (11) is made of steel.

9. A battery comprising a battery casing (1) as claimed in any one of claims 1-8, further comprising a cap (2) and a core, the cap (2) being connected to the other end of the sidewall (10), the cap (2) and the battery casing (1) enclosing a receiving space, the core being disposed within the receiving space.

10. An electronic device comprising the battery as claimed in claim 9.

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