Single battery and battery

Abstract

The utility model provides a single battery and a battery, the single battery comprises a shell and cover plates, the shell comprises two first side walls which are oppositely arranged, each first side wall comprises two first welding parts and a first main body part located between the two first welding parts along the length direction, each first welding part is connected with one cover plate, and the first main body part is located between the two first welding parts. The thickness of the first welding part is larger than that of the first main body part, so that the structural strength of the first welding part with the larger thickness is high, and when the first welding part is welded to the corresponding cover plate, the first welding part with the larger thickness and the high structural strength can meet the requirement for welding strength; meanwhile, the thickness of the first main body part is relatively thin, so that the volume of the accommodating space in the shell can be increased, the space utilization rate in the battery is improved, the weight of the first side wall and the shell can be reduced, and the light weight of the battery is realized.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to a single cell and a battery. Background Technology

[0002] With the rapid development of new energy sources, electric vehicles are placing increasingly higher demands on batteries. They not only need to possess advantages such as high energy density, high space utilization, and good heat dissipation, but also need to be lighter. However, existing batteries struggle to simultaneously meet the requirements of lightweight design and weld strength. Utility Model Content

[0003] In view of this, the purpose of this application is to provide a single cell battery and a battery to solve or partially solve the problems raised in the prior art.

[0004] To achieve the above objectives, the first aspect of this application provides a single-cell battery, comprising:

[0005] The housing has two openings that are positioned opposite each other;

[0006] The cover plate is provided in two, and the two cover plates are arranged one-to-one with the two openings. The cover plate is used to seal the corresponding opening. The cover plate and the housing together form a receiving space, and the receiving space contains the electrode assembly.

[0007] The housing includes two first sidewalls disposed opposite each other. Along the length of the housing, each first sidewall includes two first welded portions and a first main body portion located between the two first welded portions. Each first welded portion is connected to a cover plate. The thickness of the first welded portion is greater than the thickness of the first main body portion.

[0008] Optionally, the thickness of the first welded part is T1, the thickness of the first main body part is T2, and 3T2≥T1≥T2+0.1mm.

[0009] Optionally, the housing further includes two opposing second sidewalls. Along the length of the housing, each second sidewall includes two second welded portions and a second main body portion located between the two second welded portions. Each second welded portion is connected to a cover plate, and the thickness of the second welded portion is greater than the thickness of the second main body portion.

[0010] Optionally, the thickness of the second welded part is T3, and the thickness of the second main body part is T4, where 3T4≥T3≥T4+0.1mm.

[0011] Optionally, the thickness T3 of the second welded portion is the same as the thickness T1 of the first welded portion, and the thickness T2 of the first main body portion is the same as the thickness T4 of the second main body portion.

[0012] Optionally, the shell is made of aluminum or aluminum alloy, and the thickness of the first main body and the second main body is 0.25 to 1 mm; or the shell is made of iron or iron alloy, and the thickness of the first main body and the second main body is 0.1 to 1 mm.

[0013] Optionally, in the length direction of the housing, the size of the first welded portion is smaller than the size of the first main body portion, and the size of the second welded portion is smaller than the size of the second main body portion.

[0014] Optionally, in the length direction of the housing, the dimensions of the first welded portion and the second welded portion are 2 to 15 mm.

[0015] Optionally, one of the two second sidewalls has a weld seam, and the other second sidewall has an explosion-proof valve on its second main body.

[0016] A second aspect of this application provides a battery comprising a single cell battery as described in any of the first aspects above.

[0017] As can be seen from the above, the single-cell battery and battery provided in this application include a casing and a cover plate. The casing includes two opposing first sidewalls. Along the length direction, each first sidewall includes two first welded portions and a first main body portion located between the two first welded portions. Each first welded portion is connected to a cover plate. The thickness of the first welded portion is greater than the thickness of the first main body portion. Thus, the thicker first welded portion has stronger structural strength. When the first welded portion is welded to the corresponding cover plate, the thicker and stronger first welded portion can meet the welding strength requirements. At the same time, the thinner thickness of the first main body portion can increase the volume of the internal space of the casing, improve the space utilization rate inside the battery, and thus improve the volumetric energy density of the battery. Furthermore, the thinner thickness of the first main body portion can reduce the weight of the first sidewalls and the casing, thereby reducing the weight of the entire battery and achieving battery lightweighting. Thus, the battery provided in this application can further achieve battery lightweighting while meeting welding requirements, balancing the needs of lightweighting and welding strength. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1An exploded schematic diagram of a single cell according to an embodiment of this application is shown;

[0020] Figure 2 A side view of a single battery cell according to an embodiment of this application is shown;

[0021] Figure 3 It shows Figure 2 Schematic diagram of the cross section AA;

[0022] Figure 4 It shows Figure 3 A magnified view of part of C;

[0023] Figure 5 It shows Figure 2 Schematic diagram of the cross-section BB in the middle;

[0024] Figure 6 It shows Figure 3 A magnified view of part of D;

[0025] Figure 7 An exemplary structural schematic diagram of the housing according to an embodiment of this application is shown.

[0026] In the figure: 1. Shell; 11. First side wall; 111. First main body; 112. First welded part; 12. Second side wall; 121. Second main body; 1211. Explosion-proof valve; 122. Second welded part; 123. Weld; 13. Opening; 2. Cover plate. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0028] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word covers the element or object listed following the word and its equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0029] With the continuous development of lithium-ion batteries, battery lightweighting has received widespread attention in the industry. Lightweight battery technology can reduce the weight of electrical devices and decrease energy consumption. For vehicles, reducing battery weight reduces the overall weight of the vehicle, thereby reducing energy consumption and allowing the vehicle to travel a longer distance with the same amount of battery power, thus aligning with the development concept of environmental protection and energy conservation.

[0030] Lightweighting the battery casing is an important means of achieving battery weight reduction. Lightweighting the battery casing not only reduces the battery's weight but also improves the utilization of the battery's internal space, thereby increasing the battery's volumetric energy density.

[0031] Existing battery casings are typically designed with a uniform wall thickness. In practical applications, to ensure the casing meets welding requirements and possesses good structural strength, a thicker wall is necessary. However, a thicker wall results in a heavier overall casing, making it difficult to meet lightweight requirements. Conversely, reducing the overall wall thickness to meet lightweight requirements leads to insufficient structural strength, making welding between the casing and cover plate 2 difficult.

[0032] Therefore, there is an urgent need to provide a new type of battery that can balance the requirements of lightweight design and weld strength.

[0033] Based on this, this application provides a battery and a battery.

[0034] Figure 1 An exploded schematic diagram of a single cell according to an embodiment of this application is shown (electrode assembly not shown).

[0035] See Figure 1 As shown, the single battery includes: a housing 1 with two openings 13 arranged opposite to each other; and two cover plates 2, which are arranged one-to-one with the two openings 13. The cover plates 2 are used to seal the corresponding openings 13. The cover plates 2 and the housing 1 together form an accommodating space, which contains an electrode assembly. The housing 1 includes two first sidewalls 11 arranged opposite to each other. Along the length of the housing 1, each first sidewall 11 includes two first welded portions 112 and a first main body portion 111 located between the two first welded portions 112. Each first welded portion 112 is connected to a cover plate 2. The thickness of the first welded portion 112 is greater than the thickness of the first main body portion 111.

[0036] Specifically, the electrode assembly is mainly formed by stacking or winding a first electrode and a second electrode with opposite polarities, and a separator is usually provided between the first electrode and the second electrode. The portions of the first and second electrodes coated with active material constitute the active body of the electrode assembly, while the portions of the first and second electrodes not coated with active material constitute the first tab and the second tab, respectively. In a lithium-ion battery, the first electrode can be a positive electrode, including a positive current collector and positive active material layers disposed on both sides of the positive current collector. The material of the positive current collector can be, for example, aluminum, and the positive active material can be, for example, lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc.; the second electrode can be a negative electrode, including a negative current collector and negative active material layers disposed on both sides of the negative current collector. The material of the negative current collector can be, for example, copper, and the negative active material can be, for example, graphite or silicon, etc.

[0037] In this application, the first tab and the second tab can be located at opposite ends of the active body. During the charging and discharging process of the battery cell, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals to form a current loop.

[0038] The housing 1 includes two first sidewalls 11 arranged opposite to each other. The first sidewalls 11 can be the large surfaces of the housing 1, that is, the two sidewalls with larger areas among the four sidewalls of the housing 1.

[0039] Along the length direction of housing 1 (i.e. Figure 1 (In the direction shown by L in the middle), each first sidewall 11 includes two first welding parts 112 and a first main body part 111 located between the two first welding parts 112. Each first welding part 112 is connected to a cover plate 2. Thus, the two first welding parts 112 of the housing 1 are located at both ends of the housing 1 and are used to weld to the cover plate 2, while the first main body part 111 of the housing 1 is located in the middle of the housing 1 and does not require welding.

[0040] The thickness of the first welded portion 112 is greater than the thickness of the first main body portion 111. Therefore, the thicker first welded portion 112 has greater structural strength. When the first welded portion 112 is welded to the corresponding cover plate 2, its greater thickness and stronger structural strength can meet the welding strength requirements. Simultaneously, the thinner thickness of the first main body portion 111 increases the volume of the internal space of the casing 1, improving the space utilization rate inside the battery and thus increasing the volumetric energy density of the battery. Furthermore, the thinner thickness of the first main body portion 111 reduces the weight of the first sidewall 11 and the casing 1, thereby reducing the overall weight of the battery and achieving lightweighting. Thus, the battery provided in this application can further achieve lightweighting while meeting welding requirements, balancing both lightweighting and welding strength needs.

[0041] In this application, only the thickness of the first welded portion 112 can be greater than the thickness of the first main body portion 111. In this way, the first sidewall 11 can meet both the welding requirements and the requirements for lightweighting. Since the first sidewall 11 is the sidewall with the largest area among the four sidewalls of the casing 1, the performance of the first sidewall 11 largely determines the performance of the entire casing 1. Therefore, when the first sidewall 11 can meet both the welding requirements and achieve lightweighting, the battery casing 1 can also meet the welding requirements and achieve lightweighting.

[0042] Given that the thickness of the first welded portion 112 of the first sidewall 11 is greater than the thickness of the first main body portion 111, since the area of ​​the second sidewall 12 is small, its performance does not significantly affect the overall performance of the shell 1. Therefore, the second sidewall 12 can be a sidewall of equal thickness or a sidewall of unequal thickness, without limitation, depending on actual needs.

[0043] Figure 2 A side view of a single battery cell according to an embodiment of this application is shown; Figure 3 It shows Figure 2 Schematic diagram of the cross section AA; Figure 4 It shows Figure 3 A magnified view of part C in the diagram.

[0044] In some embodiments, see Figure 2 , Figure 3 and Figure 4 As shown, the thickness of the first welded part 112 is T1, the thickness of the first main body part 111 is T2, and 3T2≥T1≥T2+0.1mm.

[0045] Specifically, when 3T2≥T1≥T2+0.1mm, the thickness of the first welded part 112 is moderate, and the thickness difference between the first welded part 112 and the first main body part 111 is also moderate. In this way, the first welded part 112 can meet the welding strength requirements without being significantly larger than the thickness of the first main body part 111, thus not significantly increasing the weight of the shell 1. This allows the first sidewall 11 to achieve lightweighting while meeting the welding strength requirements, thereby increasing the volume of the internal space of the shell 1, improving the space utilization rate inside the battery, and increasing the volumetric energy density of the battery.

[0046] When T1 < T2 + 0.1 mm, the thickness of the first welded part 112 is not much different from the thickness of the first main body part 111. Thus, when the thickness of both the first welded part 112 and the first main body part 111 is small in order to achieve weight reduction, the first welded part 112 cannot meet the welding strength requirements. When the thickness of both the first welded part 112 and the first main body part 111 is large in order to meet the welding strength requirements, the first welded part 112 can meet the welding strength requirements, but cannot achieve weight reduction.

[0047] When T1 > 3T2, the thickness of the first welded part 112 is too thick. Although it can meet the welding strength requirements, it will significantly increase the weight of the casing 1, which is not conducive to achieving battery lightweighting.

[0048] For example, T1 can be T2+0.1mm, 1.5T2, 2T2, 2.5T2, 3T2, etc.

[0049] In some embodiments, see continue to see Figure 1 As shown, the housing 1 also includes two second sidewalls 12 disposed opposite to each other. Along the length direction of the housing 1, each second sidewall 12 includes two second welded portions 122 and a second main body portion 121 located between the two second welded portions 122. Each second welded portion 122 is connected to a cover plate 2. The thickness of the second welded portion 122 is greater than the thickness of the second main body portion 121.

[0050] Specifically, the area of ​​the second sidewall 12 is smaller than the area of ​​the first sidewall 11. That is, the first sidewall 11 can be the large surface of the shell 1, that is, the two sidewalls with larger areas among the four sidewalls of the shell 1, and the second sidewall 12 can be the small surface of the shell 1, that is, the two sidewalls with smaller areas among the four sidewalls of the shell 1.

[0051] Along the length direction of housing 1 (i.e. Figure 1 (In the direction shown by L in the middle), each second sidewall 12 includes two second welding parts 122 and a second main body part 121 located between the two second welding parts 122. Each of the two first welding parts 112 is connected to a cover plate 2. Thus, the two second welding parts 122 of the housing 1 are located at both ends of the housing 1 and are used to weld to the cover plate 2, while the second main body part 121 of the housing 1 is located in the middle of the housing 1 and does not require welding.

[0052] The thickness of the second welded portion 122 is greater than the thickness of the second main body portion 121. Therefore, the thicker second welded portion 122 has greater structural strength. When the second welded portion 122 is welded to the corresponding cover plate 2, its greater thickness and stronger structural strength can meet the welding strength requirements. Simultaneously, the thinner thickness of the second main body portion 121 increases the volume of the internal space of the casing 1, improving the space utilization rate inside the battery and thus increasing the volumetric energy density of the battery. Furthermore, the thinner thickness of the second main body portion 121 reduces the weight of the second sidewall 12 and the casing 1, thereby reducing the overall weight of the battery and achieving lightweighting. Thus, the battery provided in this application can further achieve lightweighting while meeting welding requirements, balancing both lightweighting and welding strength needs.

[0053] In this application, under the premise that the thickness of the first welding part 112 is greater than the thickness of the first main body part 111, so that the first sidewall 11 can meet the welding requirements and the lightweight requirements, the thickness of the second welding part 122 is further controlled to be greater than the thickness of the second main body part 121, so that the second sidewall 12 can also meet both the welding requirements and the lightweight requirements. In this way, all four sidewalls of the shell 1 can meet both the welding strength requirements and the lightweight requirements, further enabling the entire battery to take into account both the welding strength requirements and the lightweight requirements.

[0054] Figure 5 It shows Figure 2 Schematic diagram of the cross-section BB in the middle; Figure 6 It shows Figure 3 A magnified view of part of D.

[0055] In some embodiments, the thickness of the second welded portion 122 is T3, and the thickness of the second main body portion 121 is T4, where 3T4≥T3≥T4+0.1mm.

[0056] Specifically, when 3T4≥T3≥T4+0.1mm, the thickness of the second welded part 122 is moderate, and the thickness difference between the second welded part 122 and the second main body part 121 is also moderate. In this way, the second welded part 122 can meet the welding strength requirements without being significantly larger than the thickness of the second main body part 121, thus not significantly increasing the weight of the shell 1. This allows the second sidewall 12 to achieve lightweighting while meeting the welding strength requirements, thereby increasing the volume of the internal space of the shell 1, improving the space utilization rate inside the battery, and increasing the volumetric energy density of the battery.

[0057] When T3 < T4 + 0.1 mm, the thickness of the second welded part 122 is not much different from the thickness of the second main body part 121. Thus, when the thickness of both the second welded part 122 and the second main body part 121 is small in order to achieve weight reduction, the second welded part 122 cannot meet the welding strength requirements. When the thickness of both the second welded part 122 and the second main body part 121 is large in order to meet the welding strength requirements, the second welded part 122 can meet the welding strength requirements, but cannot achieve weight reduction.

[0058] When T3 > 3T4, the thickness of the second welded part 122 is too thick. Although it can meet the welding strength requirements, it will significantly increase the weight of the casing 1, which is not conducive to achieving battery lightweighting.

[0059] For example, T3 can be T4+0.1mm, 1.5T4, 2T4, 2.5T4, 3T4, etc.

[0060] In some embodiments, the thickness T3 of the second welded portion 122 is the same as the thickness T1 of the first welded portion 112, and the thickness T2 of the first main body portion 111 is the same as the thickness T4 of the second main body portion 121. Thus, the boundary between the first welded portion 112 and the second main body portion 121 on the first sidewall 11 is the same as the boundary between the second welded portion 122 and the second main body portion 121 on the second sidewall 12. The wall thickness settings of the first sidewall 11 and the second sidewall 12 are also the same. Therefore, the first sidewall 11 and the second sidewall 12 can be manufactured using the same shell material that meets the wall thickness requirements. For example, a larger shell material that meets the wall thickness requirements can be used, and after bending and welding, the shell structure of this application can be formed. Only one welding process is required to form the shell 1, which facilitates the actual manufacturing process of the shell 1.

[0061] In some embodiments, the shell 1 is made of aluminum or aluminum alloy, and the thickness of the first main body 111 and the second main body 121 is 0.25 to 1 mm; or the shell 1 is made of iron or iron alloy, and the thickness of the first main body 111 and the second main body 121 is 0.1 to 1 mm.

[0062] Specifically, when the shell 1 is made of aluminum or aluminum alloy, the material has relatively low hardness and is relatively soft. Therefore, the thickness of the first main body 111 and the second main body 121 can be 0.25–1 mm to ensure that the thickness of the first main body 111 and the second main body 121 meets the structural strength requirements of the shell 1. If the thickness of the first main body 111 and the second main body 121 is less than 0.25 mm, the thickness of the first main body 111 and the second main body 121 is too thin, resulting in insufficient structural strength, which is not conducive to the practical use of the shell 1. When the thickness of the first main body 111 and the second main body 121 is greater than 1 mm, the thickness of the first main body 111 and the second main body 121 is too thick, making it impossible to achieve extreme lightweighting. For example, the thickness of the first main body portion 111 and the second main body portion 121 can be 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1mm, etc.

[0063] When the shell 1 is made of iron or an iron alloy, the material has relatively high hardness and is quite rigid. Therefore, the thickness of the first main body 111 and the second main body 121 can be 0.1–1 mm to ensure that the thickness of the first main body 111 and the second main body 121 meets the structural strength requirements of the shell 1. If the thickness of the first main body 111 and the second main body 121 is less than 0.1 mm, the thickness of the first main body 111 and the second main body 121 is too thin, resulting in insufficient structural strength, which is detrimental to the practical use of the shell 1. When the thickness of the first main body 111 and the second main body 121 is greater than 1 mm, the thickness of the first main body 111 and the second main body 121 is too thick, making it impossible to achieve extreme lightweight design. For example, the thickness of the first main body portion 111 and the second main body portion 121 can be 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1mm, etc.

[0064] It is worth noting that, compared to the case where the shell 1 is made of aluminum or aluminum alloy, when the shell 1 is made of iron or iron alloy, the thickness of the first main body 111 and the second main body 121 can be made thinner because the shell 1 material is harder, thereby achieving extreme lightweighting.

[0065] In some embodiments, along the length of the housing 1, the size of the first welded portion 112 is smaller than the size of the first main body portion 111, and the size of the second welded portion 122 is smaller than the size of the second main body portion 121. This results in a larger proportion of the first main body portion 111 in the first sidewall 11 and a larger proportion of the second main body portion 121 in the second sidewall 12. Since both the first main body portion 111 and the second main body portion 121 are relatively thin, the larger the size of the first main body portion 111 and the second main body portion 121, the larger the internal space of the area opposite the first main body portion 111 and the second main body portion 121, and the larger the released internal space. This can further improve the utilization rate of the battery's internal space and thus improve the battery's volumetric energy density.

[0066] In some embodiments, the dimensions of the first welded portion 112 and the second welded portion 122 in the length direction of the housing 1 are 2 to 15 mm.

[0067] Specifically, the dimensions of the first welding part 112 and the second welding part 122 are 2 to 15 mm, which makes the dimensions of the first welding part 112 and the second welding part 122 suitable, which can meet the welding strength requirements without significantly increasing the weight of the casing 1, thus meeting the requirements for battery lightweighting.

[0068] When the dimensions of the first welding part 112 and the second welding part 122 are less than 2 mm, the dimensions of the first welding part 112 and the second welding part 122 are too small to meet the welding requirements; when the dimensions of the first welding part 112 and the second welding part 122 are greater than 15 mm, the dimensions of the first welding part 112 and the second welding part 122 are too large. Although they can meet the welding requirements, the thickness of the first welding part 112 and the second welding part 122 increases the weight of the entire casing 1, which cannot meet the requirements for battery lightweighting.

[0069] For example, the dimensions of the first welding part 112 and the second welding part 122 can be 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, etc.

[0070] Figure 7 An exemplary structural schematic diagram of the housing 1 according to an embodiment of this application is shown.

[0071] In some embodiments, see Figure 7 As shown, one of the two second sidewalls 12 is provided with a weld 123, and the other second sidewall 12 is provided with an explosion-proof valve 1211 on its second main body 121.

[0072] Specifically, the explosion-proof valve 1211 can be opened by excessive air pressure inside the battery. When the internal pressure in the containment space exceeds a certain threshold, the explosion-proof valve 1211 is opened to release the internal air pressure and improve the safety of the battery.

[0073] An explosion-proof valve 1211 is provided on the second main body 121 of the second side wall 12, making the explosion-proof valve 1211 thinner and easier to be opened by excessive internal pressure inside the battery to release internal air pressure and ensure that the battery will not explode.

[0074] Of the two second sidewalls 12, one second sidewall 12 is provided with a weld 123, and the second main body 121 of the other second sidewall 12 is provided with an explosion-proof valve 1211. The weld 123 and the explosion-proof valve 1211 are arranged opposite to each other, so that both the weld 123 and the explosion-proof valve 1211 can serve as weak points of the housing 1. When the internal pressure of the housing 1 is too large, the weld 123 and the explosion-proof valve 1211 can be deformed or opened by impact to release the internal pressure, ensure that the battery will not explode, and improve the safety of the battery.

[0075] This application also provides a battery, including the single-cell battery of any of the above embodiments.

[0076] Specifically, a battery can contain multiple individual cells, which can be connected in series, parallel, or a combination thereof. A combination of series and parallel connections refers to multiple individual cells being connected in both series and parallel configurations. Multiple individual cells can be directly connected in series, parallel, or a combination thereof, and then the entire assembly is housed within a casing. Alternatively, a battery can consist of multiple individual cells first connected in series, parallel, or a combination thereof to form a battery module, and then these modules are connected in series, parallel, or a combination thereof to form a single unit housed within a casing. The battery can also include other structures; for example, it can include a busbar component for electrical connection between the multiple individual cells.

[0077] The battery has the technical effects described in any of the above embodiments, and will not be repeated here.

[0078] 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 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 the different aspects of this application as described above, which are not provided in detail for the sake of brevity.

[0079] 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 this application should be included within the protection scope of this application.

Claims

1. A single-cell battery, characterized in that, include: The housing has two openings that are positioned opposite each other; The cover plate is provided in two, and the two cover plates are arranged one-to-one with the two openings. The cover plate is used to seal the corresponding opening. The cover plate and the housing together form a receiving space, and the receiving space contains the electrode assembly. The housing includes two first sidewalls disposed opposite each other. Along the length of the housing, each first sidewall includes two first welded portions and a first main body portion located between the two first welded portions. Each first welded portion is connected to a cover plate. The thickness of the first welded portion is greater than the thickness of the first main body portion.

2. The single-cell battery according to claim 1, characterized in that, The thickness of the first welded part is T1, the thickness of the first main body part is T2, and 3T2≥T1≥T2+0.1mm.

3. The single-cell battery according to claim 1, characterized in that, The housing also includes two opposing second sidewalls. Along the length of the housing, each second sidewall includes two second welded portions and a second main body portion located between the two second welded portions. Each second welded portion is connected to a cover plate, and the thickness of the second welded portion is greater than the thickness of the second main body portion.

4. The single-cell battery according to claim 3, characterized in that, The thickness of the second welded part is T3, and the thickness of the second main body part is T4, where 3T4≥T3≥T4+0.1mm.

5. The single-cell battery according to claim 3, characterized in that, The thickness T3 of the second welded part is the same as the thickness T1 of the first welded part, and the thickness T2 of the first main body part is the same as the thickness T4 of the second main body part.

6. The single-cell battery according to claim 3, characterized in that, The shell is made of aluminum or aluminum alloy, and the thickness of the first main body and the second main body is 0.25-1mm; or the shell is made of iron or iron alloy, and the thickness of the first main body and the second main body is 0.1-1mm.

7. The single-cell battery according to claim 3, characterized in that, Along the length of the housing, the size of the first welded portion is smaller than the size of the first main body portion, and the size of the second welded portion is smaller than the size of the second main body portion.

8. The single-cell battery according to claim 7, characterized in that, Along the length of the housing, the dimensions of the first welded portion and the second welded portion are 2 to 15 mm.

9. The single-cell battery according to claim 3, characterized in that, Of the two second sidewalls, one second sidewall has a weld, and the other second sidewall has an explosion-proof valve on its second main body.

10. A battery comprising a single cell as described in any one of claims 1 to 9.

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