Single battery and battery pack

Abstract

The utility model provides a single battery and a battery pack. The single battery comprises a shell, an inner surface and an outer surface, the cover plate assembly is connected with the shell, so that a cavity is defined by the cover plate assembly and the inner surface, and the cover plate assembly is provided with an electrode terminal; the electrode assembly is positioned in the cavity; a tab of the electrode assembly is electrically connected with the electrode terminal in the cavity; the thickening part is arranged on the outer surface and protrudes towards the direction far away from the cavity; the thickened part is provided with an assembly part connected with the inner surface, and the section of the assembly part in the height direction of the shell is step-shaped; the explosion-proof assembly is mounted on the assembling part and seals the cavity; according to the battery, the thickening part is arranged on the outer surface of the shell, so that the explosion-proof assembly with a larger thickness value can be mounted, the durability of the explosion-proof assembly is improved, and the safety of the battery is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a single battery and a battery pack. BACKGROUND

[0002] The explosion-proof assembly is an important safety assembly of the single battery, which can be opened and release the high-temperature and high-pressure substances inside the battery when the battery is in thermal runaway, so as to prevent the battery from being damaged or exploded and other safety accidents.

[0003] In the related art, as shown in Figure 1 and Figure 2 , the explosion-proof assembly is usually composed of an explosion-proof sheet and a patch, wherein, since the explosion-proof sheet is in long-term contact with the electrolyte, the surface thereof is gradually corroded by the electrolyte, and the wall thickness of the battery shell limits the thickness of the explosion-proof sheet, which causes the explosion-proof sheet to be easily thinned and aged, thereby affecting the safety of the battery in use. CONTENT OF THE UTILITY MODEL

[0004] Therefore, the present application aims to provide a single battery and a battery pack to solve the above-mentioned technical problems.

[0005] To achieve the above purpose, the first aspect of the present application provides a single battery, comprising:

[0006] a shell comprising an inner surface and an outer surface arranged oppositely;

[0007] a cover plate assembly connected with the shell to form a cavity with the inner surface, the cover plate assembly being provided with an electrode terminal;

[0008] an electrode assembly located in the cavity; the tab of the electrode assembly is electrically connected with the electrode terminal in the cavity;

[0009] a thickened portion provided on the outer surface and protruding away from the cavity; the thickened portion is provided with a fitting portion connected with the inner surface, and the cross section of the fitting portion in the height direction of the shell is in a stepped shape;

[0010] an explosion-proof assembly mounted on the fitting portion and sealing the cavity.

[0011] The second aspect of the present application provides a battery pack, comprising:

[0012] a box body, the box body being provided with a containing cavity; and

[0013] at least two single batteries according to the first aspect, the at least two single batteries being located in the containing cavity;

[0014] the protruding directions of the thickened portions of any two single batteries are the same,

[0015] The thickness of the thickened portion in the shell height direction is less than the minimum distance between the thickened portion and the inner bottom wall of the accommodating cavity.

[0016] From the above, it can be seen that the single battery and battery pack provided by the present application provide a more abundant installation space for the explosion-proof assembly by arranging the protruding thickened portion on the outer surface of the shell, so as to apply a thicker and more corrosion-resistant explosion-proof assembly, thereby slowing down the aging rate of the explosion-proof assembly, which is conducive to improving the durability of the explosion-proof assembly, prolonging the service life of the battery and improving the safety of its application. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present application or related art, the drawings needed to be used in the embodiments or related art description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0018] Figure 1 It is a schematic diagram of a single battery in the related art;

[0019] Figure 2 It is a sectional view of a shell in the related art;

[0020] Figure 3 It is a schematic diagram of a single battery at a first angle in the present application;

[0021] Figure 4 It is a schematic diagram of a single battery at a second angle in the present application;

[0022] Figure 5 It is a sectional view of a single battery in the present application;

[0023] Figure 6 It is a local enlarged schematic diagram of a thickened portion in the present application;

[0024] Figure 7 It is a structural schematic diagram of a battery pack in the present application.

[0025] Explanation of reference signs:

[0026] 10, single battery;

[0027] 1, shell; 101, inner surface; 102, outer surface;

[0028] 2, cover plate assembly; 201, cavity; 202, electrode terminal; 203, liquid injection hole;

[0029] 3, electrode assembly;

[0030] 4, thickening part; 401, assembly surface; 402, stepped hole; 4021, first hole section; 4022, second hole section; 4023, third hole section;

[0031] 5, explosion-proof assembly; 510, patch; 520, explosion-proof patch; 21, first plugging part; 522, second plugging part;

[0032] 20, box. DETAILED DESCRIPTION

[0033] To make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to specific embodiments and drawings.

[0034] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be understood as the common meanings understood by those with ordinary skills in the art to which the present application belongs. The terms "first", "second" and similar terms used in the embodiments of the present application do not represent any order, number or importance, but are only used to distinguish different components. The terms "include", "contain" and similar terms mean that the components or objects before the terms cover the components or objects listed after the terms and their equivalents, and do not exclude other components or objects. The terms "connect" or "connected" and similar terms do not mean physical or mechanical connection, but can include electrical connection, whether direct or indirect. The terms "upper", "lower", "left", "right" and the like only represent relative positional relationships, which can change accordingly when the absolute positions of the described objects change.

[0035] The embodiments of the present application will be described in detail below with reference to the drawings.

[0036] For a single battery 10 such as a square cell, the explosion-proof assembly 5 is used to maintain the stability of the internal environment of the single battery 10. According to the prior art, when the single battery 10 is in thermal runaway, the internal pressure and temperature of the single battery 10 increase. If the internal pressure and / or temperature of the single battery 10 exceeds the corresponding safety threshold, the explosion-proof assembly 5 of the single battery 10 will be de-soldered and opened, so that the high-temperature and high-pressure gas and eruption material in the battery are instantly ejected to reduce the risk of thermal runaway of the single battery 10. Figure 1 and Figure 2 As shown in the prior art, Figure 1 is a schematic diagram of a single battery 10 in the related art, Figure 2 is a cross-sectional view of a shell 1 in the related art, the explosion-proof assembly 5 includes an explosion-proof patch 520 for plugging the release hole of the shell 1 and a patch 510 for shielding the explosion-proof patch 520. When the single battery 10 is in thermal runaway, the internal pressure and temperature of the single battery 10 increase. If the internal pressure and / or temperature of the single battery 10 exceeds the corresponding safety threshold, the explosion-proof assembly 5 of the single battery 10 will be de-soldered and opened, so that the high-temperature and high-pressure gas and eruption material in the battery are instantly ejected to reduce the risk of thermal runaway of the single battery 10.

[0037] In this design, the explosion-proof plate 520 of some individual battery cells 10 is disposed on the side wall of the individual battery cell 10. Specifically, taking the explosion-proof plate 520 located at the bottom of the individual battery cell 10 as an example, when thermal runaway occurs, the explosion-proof plate 520 detaches from the solder joint and allows high-temperature, high-pressure gases and ejected materials to be discharged in a directional manner, reducing the impact of the individual battery cell 10 on its surroundings and connected electrical equipment. In addition, this design facilitates thermoelectric separation, preventing electrical faults in its wiring parts or electrical equipment due to thermal runaway, and improving the safety of the individual battery cell 10.

[0038] like Figure 2 As shown, since the explosion-proof plate 520 of the explosion-proof component 5 is installed on the housing 1, its surface is in long-term contact with the electrolyte. Due to the corrosion of the electrolyte, the thickness of the explosion-proof plate 520 will gradually decrease, resulting in a gradual decrease in its durability, which affects the service life of the single battery 10 and the safety of its application. In addition, based on production cost and lightweight design requirements, the housing 1 of the single battery 10 should not be too thick. Therefore, due to the limitation of the thickness of the housing 1, the housing 1 of the single battery 10 is currently difficult to adapt to the explosion-proof plate 520 with a larger thickness value, which makes the explosion-proof component 5 more prone to aging and failure, which not only shortens the service life of the single battery 10, but also threatens the safety of its application.

[0039] A first aspect of this application provides a single-cell battery 10, combined with... Figures 2-6 The exhibit provides a detailed description of the single-cell battery 10.

[0040] A single-cell battery 10 includes a housing 1, a cover plate assembly 2, an electrode assembly 3, a thickened portion 4, and an explosion-proof component 5. The housing 1 includes an inner surface 101 and an outer surface 102 disposed opposite to each other. The cover plate assembly 2 is connected to the housing 1 so that the cover plate assembly 2 and the inner surface 101 enclose a cavity 201, and the cover plate assembly 2 is provided with electrode terminals 202. The electrode assembly 3 is located in the cavity 201, and the tabs of the electrode assembly 3 are electrically connected to the electrode terminals 202 in the cavity 201. The thickened portion 4 is disposed on the outer surface 102 and protrudes in a direction away from the cavity 201. The thickened portion 4 is provided with an assembly portion that connects to the inner surface 101, and the cross-section of the assembly portion in the height direction of the housing 1 is stepped. The explosion-proof component 5 is installed on the assembly portion and seals the cavity 201.

[0041] Please see Figures 3-6 , Figure 3 This is a schematic diagram of a single cell 10 at a first angle in this application. Figure 4 This is a schematic diagram of the single cell 10 at the second angle in this application. Figure 5 This is a cross-sectional view of the single cell 10 in this application. Figure 6 This is a partially enlarged schematic diagram of the thickened portion 4 in this application.

[0042] Specifically, such as Figures 1-5As shown, the casing 1 is the main supporting body of the single battery 10, mainly including an inner surface 101 and an outer surface 102 arranged opposite to each other. The inner surface 101 of the casing 1 is recessed to form a receiving cavity, which can accommodate electrolyte and related components such as electrode assembly 3.

[0043] For example, the housing 1 may be formed of aluminum and related alloys, which are strong and lightweight.

[0044] For example, the inner surface 101 of the housing 1 can be coated with a coating that is chemically stable, highly corrosion-resistant, and has good insulation properties, such as polyurethane or ceramic coating, which can extend the service life of the housing 1.

[0045] Furthermore, such as Figure 3 As shown, the cover plate assembly 2 is connected to the housing 1 and surrounds the inner surface 101 of the housing 1 to form a cavity 201. The cavity 201 can be sealed by the cover plate assembly 2, which can maintain the stability of the internal environment of the single cell 10. In addition, the cover plate assembly 2 is provided with electrode terminals 202 through it. The exposed part of the electrode terminals 202 can establish an electrical connection between external electrical devices.

[0046] For example, the cover plate assembly 2 may also be provided with an injection hole 203 for replenishing electrolyte into the housing 1.

[0047] Furthermore, such as Figure 5 As shown, the electrode assembly 3 is located in the cavity 201 and immersed in the electrolyte, and the tabs of the electrode assembly 3 are electrically connected to the electrode terminals 202 in the cavity 201. The electrode assembly 3 includes a positive electrode, a negative electrode, and a diaphragm to isolate the positive and negative electrodes. The positive and negative electrodes are electrically connected to different electrode terminals 202 through the tabs and store and release energy in the electrolyte through chemical reactions. The diaphragm allows ions in the electrolyte to migrate freely during the electro-circulation process and prevents the positive and negative electrodes from contacting each other and causing a short circuit.

[0048] Furthermore, such as Figures 4-6 As shown, the thickened portion 4 is provided on the outer surface 102 of the housing 1 and protrudes in a direction away from the cavity 201, so as to form an assembly area with a larger thickness on the outer surface 102 of the housing 1. At this time, the assembly area can be adapted to the explosion-proof component 5 with a larger thickness, thereby increasing the ability of the explosion-proof component 5 to resist electrolyte corrosion, thereby slowing down the aging rate of the explosion-proof component 5, improving its durability, which is conducive to extending the service life of the single battery 10 and improving the safety of the application of the single battery 10.

[0049] For example, such as Figure 6As shown, the thickness of the housing 1 and the thickness of the thickened part 4 are a (a>0) and b (b>0), respectively. At this time, the thickness of the assembly area formed by the housing 1 and the thickened part 4 is a+b and is greater than the thickness of the housing 1. Therefore, compared with directly installing the explosion-proof component 5 on the side wall of the housing 1, the single cell 10 in this application can be adapted to the explosion-proof component 5 with a larger thickness value, thus having better performance.

[0050] Furthermore, the thickened part 4 is provided with an assembly part that connects to the inner surface 101, and the cross section of the assembly part in the height direction of the housing 1 is stepped, so that the assembly part can be adapted to the explosion-proof component 5, ensuring the firmness of the connection between the explosion-proof component 5 and the assembly part; and the explosion-proof component 5 installed in the assembly part can seal the cavity 201, so that it can effectively protect the single battery 10 while isolating the internal and external environment of the single battery 10.

[0051] For example, the thickness of the bottom of the housing 1 can be set to 1mm-1.5mm to ensure good connection strength between the housing 1 and the thickened part 4, while also controlling the weight of the housing 1.

[0052] In some embodiments, the thickness of the thickened portion 4 in the height direction of the housing 1 is 0.5mm-9mm. Specifically, setting the thickness of the thickened portion 4 to 0.5mm-9mm can significantly increase the size of the assembly portion, providing sufficient installation space for the explosion-proof component 5 and ensuring its installation strength, thereby ensuring the safety and reliability of the application of the single battery cell 10. At the same time, controlling the thickness of the thickened portion 4 within this range can effectively control the weight of the single battery cell 10, avoiding the impact on the performance of the single battery cell 10 due to excessive weight gain.

[0053] In some embodiments, the thickened portion 4 and the housing 1 are integrally formed and connected, which can ensure good connection strength between the housing 1 and the thickened portion 4.

[0054] For example, the housing 1 can be formed by a stretch forming process, and a thickening layer is formed at its bottom during the forming process. The thickening layer is then machined into a thickening part 4 by milling or turning, so that there is good connection strength between the housing 1 and the thickening part 4, while also controlling the overall weight of the housing 1.

[0055] In some embodiments, the assembly portion includes an assembly surface 401 and a stepped hole 402; specifically, as shown in the figure Figure 5 and Figure 6 As shown, the mounting surface 401 is located on the side of the thickened part 4 away from the cavity 201. When the explosion-proof valve is connected to the mounting surface 401, it can shield the stepped hole 402, improve the refinement of the surface of the single cell 10, and provide effective protection for the inside of the stepped hole 402.

[0056] Furthermore, such asFigure 5 and Figure 6 As shown, the stepped hole 402 is disposed within the thickened portion 4 and penetrates both the inner surface 101 and the mounting surface 401. At this time, the cavity 201 inside the housing 1 communicates with the outside through the stepped hole 402. When the single-cell battery 10 experiences thermal runaway, the high-temperature, high-pressure gas and ejected materials inside the housing 1 can be directionally discharged through the stepped hole 402, ensuring the safety of the single-cell battery 10 in application. Simultaneously, part of the explosion-proof component 5 is located within the stepped hole 402, providing an installation position for the explosion-proof component 5 to seal the cavity 201 of the single-cell battery 10, maintaining the stability and balance of the internal environment of the single-cell battery 10, thereby ensuring the performance of the single-cell battery 10.

[0057] In some embodiments, the stepped hole 402 includes a first hole segment 4021, a second hole segment 4022, and a third hole segment 4023 that are sequentially connected in the height direction of the housing 1; the first hole segment 4021 penetrates the inner surface 101, and the third hole segment 4023 penetrates the mounting surface 401, thereby forming a channel connecting the internal and external environments of the single cell 10, ensuring that when the single cell 10 experiences thermal runaway, high-temperature and high-pressure gases and ejected materials can be discharged to the external environment sequentially through the first hole segment 4021, the second hole segment 4022, and the third hole segment 4023.

[0058] Specifically, such as Figure 2 , Figure 5 and Figure 6 As shown, since the stepped hole 402 is opened in the assembly area formed by the housing 1 and the thickened part 4, the height of the first hole segment 4021, the second hole segment 4022 and the third hole segment 4023 in the height direction of the housing 1 is increased compared with the through hole opened on the housing 1 in the related art; it can provide a more sufficient connection area and accommodation space, so that it can be adapted to the larger explosion-proof component 5, and ensure the firmness of the explosion-proof component 5 installed in the stepped hole 402.

[0059] Furthermore, such as Figure 6 As shown, the explosion-proof component 5 is partially embedded in the second hole section 4022 and the third hole section 4023, which can provide sufficient installation space for the explosion-proof component 5, ensure the firmness of the installation of the explosion-proof component 5, and ensure its sealing effect on the step hole 402.

[0060] Furthermore, such as Figure 6As shown, when the single cell 10 experiences thermal runaway, the sealing effect of the explosion-proof component 5 on the stepped hole 402 needs to be released. That is, the explosion-proof component 5 moves away from the cavity 201 during thermal runaway. Therefore, when assembling the explosion-proof component 5, it needs to be installed in the direction from the third hole section 4023 to the second hole section 4022. At this time, by making the inner diameter of the first hole section 4021, the second hole section 4022 and the third hole section 4023 increase sequentially from the inner surface 101 to the assembly surface 401, the cross section of the stepped hole 402 in the height direction of the housing 1 can be stepped, and the explosion-proof component 5 can be limited to ensure that the explosion-proof component 5 can be smoothly detached when the single cell 10 experiences thermal runaway again.

[0061] In some embodiments, the height of the first hole segment 4021 in the height direction of the housing 1 is 0.4mm-8mm. For example... Figure 6 As shown, the depth of the first hole segment 4021 in the height direction of the housing 1 can be set to c; where c can be in the range of 0.4mm-8mm, so as to reserve more venting space inside the single cell 10 and ensure the venting effect of the single cell 10; at the same time, it can also avoid contact with the electrode assembly 3 when the electrode assembly 3 expands, thus affecting the performance of the single cell 10.

[0062] In some embodiments, the side of the thickened portion 4 is connected to the mounting surface 401 by a rounded transition.

[0063] Specifically, such as Figure 5 and Figure 6 As shown, by connecting the thickened portion 4 with its adjacent side through an arc transition, even if the edges or corners of the thickened portion 4 have an R-angle transition, the stress of the thickened portion 4 can be effectively dispersed, reducing the potential damage caused by the sharp edges of the thickened portion 4 and improving the safety of the product.

[0064] For example, the arc on the thickened portion 4 can be formed by a grinding and polishing process.

[0065] In some embodiments, the explosion-proof component 5 includes a patch 510 and an explosion-proof sheet 520. Specifically, as Figure 6 As shown, the patch 510 is disposed on the mounting surface 401 and covers the stepped hole 402, which can effectively shield the stepped hole 402, improve the surface finish of the thickened part 4, and also protect the explosion-proof piece 520 located inside the stepped hole 402 from external influences, preventing dust and other impurities from accumulating inside the stepped hole 402.

[0066] Furthermore, such as Figure 5 and Figure 6As shown, the explosion-proof plate 520 is adapted to and embedded in the stepped hole 402, so that the explosion-proof plate 520 effectively seals the stepped hole 402, providing a good operating environment for the electrode assembly 3; and when the single cell 10 experiences thermal runaway, the explosion-proof plate 520 disengages from the inner wall of the stepped hole 402, ensuring that the high-temperature and high-pressure gas and ejected material inside the single cell 10 can be discharged.

[0067] For example, such as Figure 6 As shown, assuming the thickness of the explosion-proof disc 520 is d, compared to explosion-proof discs 520 in related technologies, the thickness of the explosion-proof disc 520 can be increased to 0.6mm-2mm. For example, if the thickness of the applied explosion-proof disc 520 is 1mm and the annual corrosion depth is 0.1mm, then the annual corrosion rate of the explosion-proof disc 52013 reaches 10%; if a 2mm thick explosion-proof disc 520 is used, the corrosion rate is reduced to 5%. Therefore, it can be seen that the greater the thickness of the applied explosion-proof disc 520, the stronger its ability to resist electrolyte corrosion, and thus the better its durability.

[0068] Furthermore, the gap between the explosion-proof disc 520 and the patch 510 can reduce the restraining effect of the patch 510 on the explosion-proof disc 520, so that the explosion-proof disc 520 can move away from the cavity 201 in the event of thermal runaway, allowing the high-temperature and high-pressure gas and ejected material to be discharged in a directional manner.

[0069] For example, such as Figure 6 As shown, the gap between the explosion-proof sheet 520 and the patch 510 is set to e; where the value of e can be in the range of 0.4mm-0.6mm, to avoid interference with the patch 510 when the explosion-proof sheet 520 expands, and also to avoid the gap between the two being too large, which would cause the size of the thickened part 4 to increase excessively.

[0070] In some embodiments, the explosion-proof plate 520 includes a first sealing portion 21 and a second sealing portion 522 connected to each other. Specifically, as shown... Figure 6 As shown, the first sealing part 21 is adapted to and embedded in the second hole section 4022, so that the first sealing part 21 effectively seals the second hole section 4022 and isolates the cavity 201 of the housing 1 from the external environment. In addition, high-temperature gas can directly act on the surface of the explosion-proof sheet 520 through the first hole section 4021, ensuring that the high-temperature and high-pressure gas can break through the explosion-proof sheet 520 and be discharged in time in the event of thermal runaway, thereby reducing the impact of thermal runaway on the single cell 10.

[0071] Furthermore, the second sealing part 522 is located inside the third hole section 4023, and there is a gap between the edge of the second sealing part 522 and the inner wall of the third hole section 4023. At this time, the reserved gap can provide a welding area for the explosion-proof piece 520 and the thickened part 4, so as to weld the explosion-proof piece 520 to the inside of the stepped hole 402, ensuring the firmness of the connection between the explosion-proof piece 520 and the thickened part 4 and the sealing effect of the stepped hole 402.

[0072] A second aspect of this application also provides a battery pack for improving the safety of battery pack applications, combined with Figure 7 The battery pack is described in detail.

[0073] A battery pack includes a housing 20 and at least two individual cells 10 as described in any one embodiment of the first aspect; specifically, since the battery pack includes the individual cells 10 described in any one of the above embodiments, it possesses all the advantages and beneficial effects of the individual cells 10.

[0074] More specifically, such as Figure 7 As shown, the housing 20 has a receiving cavity, in which at least two individual batteries 10 are located. The housing 20 can accommodate at least two individual batteries 10 to provide effective protection for the individual batteries 10 and improve the compatibility of the battery pack.

[0075] Furthermore, such as Figure 7 As shown, within the accommodating cavity, the thickened portions 4 of any two individual cells 10 protrude in the same direction. When at least one individual cell 10 in the battery pack experiences thermal runaway, the impact of that battery on the surrounding individual cells 10 can be reduced, thereby improving the safety of the battery application process.

[0076] Furthermore, such as Figure 7 As shown, inside the housing 20, the thickness of the thickened part 4 in the height direction of the housing 1 is less than the minimum distance between the thickened part 4 and the inner surface of the inner bottom wall of the receiving cavity, so that sufficient space is reserved between the side of the thickened part 4 away from the cavity 201 and the inner surface 101 of the housing 20 to ensure the smooth exhaust of the single battery 10.

[0077] For example, such as Figure 7 As shown, the minimum distance between the thickened part 4 and the receiving cavity is f, and the value of the minimum distance f is in the range of 10mm-12mm. Since the thickness b of the thickened part 4 in the height direction of the shell 1 is 0.5mm-9mm, f>b, so as to ensure that the single cell 10 can smoothly discharge high temperature and high pressure gas and ejected material when thermal runaway, and ensure the overall safety of the battery pack.

[0078] It should be noted that the above description describes some embodiments of this application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in a different order than that shown in the above embodiments and still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0079] The various embodiments in this application are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0080] The description in this application is given for illustrative purposes and is not intended to be exhaustive or to limit the application to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of this application and to enable those skilled in the art to understand this application and design various embodiments with various modifications suitable for a particular purpose.

[0081] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application (including the claims) is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of this application as described above, which are not provided in the details for the sake of brevity.

[0082] Although this application has been described in conjunction with specific embodiments thereof, many substitutions, modifications and variations of these embodiments will be apparent to those skilled in the art from the foregoing description.

[0083] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A single-cell battery, characterized in that, include: The housing includes an inner surface and an outer surface that are disposed opposite to each other; A cover plate assembly is connected to the housing so that the cover plate assembly and the inner surface enclose a cavity, and the cover plate assembly is provided with electrode terminals; An electrode assembly is located within the cavity; the tabs of the electrode assembly are electrically connected to the electrode terminals within the cavity. A thickened portion is provided on the outer surface and protrudes in a direction away from the cavity; the thickened portion is provided with an assembly portion that connects to the inner surface, and the cross-section of the assembly portion in the height direction of the housing is stepped; An explosion-proof component is installed on the assembly and seals the cavity.

2. The single-cell battery according to claim 1, characterized in that, The thickness of the thickened portion in the height direction of the shell is 0.5mm-9mm.

3. The single-cell battery according to claim 1, characterized in that, The thickened part is integrally formed and connected to the shell.

4. The single-cell battery according to claim 1, characterized in that, The assembly unit includes: The mounting surface is located on the side of the thickened portion away from the cavity; A stepped hole is provided inside the thickened portion; the stepped hole passes through the inner surface and the mounting surface respectively. The explosion-proof component is partially connected to the mounting surface and partially embedded in the stepped hole.

5. The single-cell battery according to claim 4, characterized in that, The stepped hole includes a first hole segment, a second hole segment, and a third hole segment that are sequentially connected along the height direction of the housing; the first hole segment penetrates the inner surface, and the third hole segment penetrates the mounting surface. The explosion-proof component is partially embedded in the second and third hole sections. The inner diameters of the first hole segment, the second hole segment, and the third hole segment increase sequentially from the inner surface to the assembly surface.

6. The single-cell battery according to claim 5, characterized in that, The height of the first hole segment in the height direction of the housing is 0.4mm-8mm.

7. The single-cell battery according to claim 4, characterized in that, The side of the thickened part is connected to the mounting surface by a rounded transition.

8. The single-cell battery according to claim 6, characterized in that, The explosion-proof component includes: A patch is disposed on the mounting surface and covers the stepped hole; An explosion-proof sheet is adapted to and embedded in the stepped hole to seal the stepped hole, and there is a gap between the explosion-proof sheet and the patch.

9. The single-cell battery according to claim 8, characterized in that, The explosion-proof plate includes a first sealing part and a second sealing part that are connected to each other. The first sealing part is adapted to the second hole segment and is embedded in the second hole segment. The second sealing part is located inside the third hole section, and there is a gap between the edge of the second sealing part and the inner wall of the third hole section.

10. A battery pack, characterized in that, include: The box body has a receiving cavity inside; as well as At least two single-cell batteries as described in any one of claims 1-9, wherein at least two of the single-cell batteries are located within the receiving cavity; The thickened portions of any two individual cells protrude in the same direction. The thickness of the thickened portion in the height direction of the housing is less than the minimum distance between the thickened portion and the inner bottom wall of the receiving cavity.

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