Battery, battery pack, and battery device

Abstract

The utility model provides a kind of battery, battery pack and battery device, it is related to battery structure technical field, battery includes shell, shell has accommodating cavity, shell has opening in one end;Cover plate, cover plate is used to cover opening, and mounting hole is opened in cover plate;Pole, the first end of pole is worn in mounting hole;Insulating component, insulating component is located between the outer periphery of pole and the inner edge of mounting hole;And busbar, busbar is welded with the first surface of pole;The material quality that busbar adopts includes first metal and first alloy element doped in first metal, the melting point of first alloy element is higher than the melting point of first metal;The welding area between busbar and the first surface of pole on the first surface of pole is ratio a, and the content ratio b of first alloy element in busbar, between both satisfy: 0.00001≤a*b≤0.05.The utility model can solve the problem of melting insulating component when busbar is welded.

Description

Technical Field

[0001] This utility model relates to the field of battery structure technology, and in particular to a battery, battery pack and battery device. Background Technology

[0002] With the rapid development of new energy vehicles, the demand for fast charging of energy storage devices is also increasing. Currently, in order to achieve fast charging, the voltage of the battery pack is usually designed to be higher. This requires more batteries to be connected in series within the limited space of the battery pack, resulting in the battery thickness gradually becoming thinner. To meet the fast charging requirements, batteries have begun to use irregularly shaped terminals.

[0003] In related technologies, when fixing irregularly shaped terminals to a cover plate, irregularly shaped terminal holes are made in the cover plate, and a flange structure is set around the terminal holes to press and fix the terminal and sealing components. In addition, the exposed side of the irregularly shaped terminal through the terminal hole needs to be welded to the busbar. However, the heat generated during the welding process between the irregularly shaped terminal and the busbar can affect the sealing components. For example, the sealing components may melt due to heat, causing insulation failure between the irregularly shaped terminal and the busbar, which in turn can lead to a short circuit in the battery. Utility Model Content

[0004] In view of the above problems, the present invention provides a battery, a battery pack and a battery device that can reduce the impact of heat generated during the welding process of irregularly shaped terminals and busbars on the sealing components, thereby avoiding insulation failure between irregularly shaped terminals and busbars and the problem of battery short circuit.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A first aspect of this utility model provides a battery, comprising:

[0007] A housing having a receiving cavity and an opening at one end;

[0008] A cover plate, the cover plate being used to seal the opening, and the cover plate having mounting holes;

[0009] A terminal post, one end of which passes through the mounting hole;

[0010] An insulating component is disposed between the outer periphery of the pole post and the inner edge of the mounting hole;

[0011] The busbar is welded to the first surface of the pole post; the material used for the busbar includes a first metal and a first alloying element doped in the first metal, wherein the melting point of the first alloying element is higher than the melting point of the first metal.

[0012] The welding area between the busbar and the first surface of the pole post is a percentage of the first surface of the pole post, and the content percentage of the first alloy element in the busbar is b. The two satisfy the condition: 0.00001≤a*b≤0.05.

[0013] The battery, battery pack, and battery device provided in this embodiment of the utility model have the following advantages:

[0014] In the battery provided by this embodiment, the strength of the busbar is improved by doping it with a first alloying element. Furthermore, the heat generated during busbar welding is limited by restricting the product range of the ratio 'a' of the welding area between the busbar and the first surface of the terminal post on the first surface of the terminal post and the ratio 'b' of the content of the first alloying element in the busbar. This prevents the insulating components from melting during the busbar welding process and ensures the busbar's strength and current carrying capacity.

[0015] In addition to the technical problems solved by the embodiments of the present invention, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions as described above, other technical problems that can be solved by the batteries and electronic devices provided by the embodiments of the present invention, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further explained in detail in the specific embodiments. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the cover plate provided in an embodiment of this application;

[0018] Figure 2 This is a schematic diagram of the structure of one end of the cover plate provided in an embodiment of this application;

[0019] Figure 3 for Figure 2 A cross-sectional view along the AA direction;

[0020] Figure 4 for Figure 2 Cross-sectional view along the BB direction;

[0021] Figure 5 This is a schematic diagram of the battery structure according to an embodiment of this application.

[0022] Explanation of reference numerals in the attached figures:

[0023] 100 - Cover plate; 110 - Mounting hole; 120 - Pressing flange; 121 - First side edge; 122 - Second side edge; 130 - Mounting countersunk platform;

[0024] 200 - pole post; 210 - first surface; 220 - first step portion;

[0025] 300 - Insulation component; 310 - Second step section;

[0026] 400 - Busbar; 410 - Reinforcing rib; 420 - Weld stamp;

[0027] 500 - Insulating Press-fit Parts;

[0028] 600 - Housing. Detailed Implementation

[0029] With the rapid development of new energy vehicles, the demand for fast charging of energy storage devices is also increasing. Currently, in order to achieve fast charging, the voltage of the battery pack is usually designed to be higher. This requires more batteries to be connected in series within the limited space of the battery pack, resulting in the battery thickness gradually becoming thinner. To meet the fast charging requirements, batteries have begun to use irregularly shaped terminals.

[0030] In related technologies, when fixing irregularly shaped terminals to a cover plate, irregularly shaped terminal holes are made in the cover plate, and a flange structure is set around the terminal holes to press and fix the terminal and sealing components. In addition, the exposed side of the irregularly shaped terminal through the terminal hole needs to be welded to the busbar. However, the heat generated during the welding process between the irregularly shaped terminal and the busbar can affect the sealing components. For example, the sealing components may melt due to heat, causing insulation failure between the irregularly shaped terminal and the busbar, which in turn can lead to a short circuit in the battery.

[0031] The terminals have different lengths in the first and second directions, so that during the welding process between the terminals and the busbar, the second direction is more susceptible to the effects of welding heat, which can cause the insulation components to melt, leading to insulation failure and causing a short circuit in the battery.

[0032] To address the aforementioned problems, the battery provided in this embodiment of the invention increases the melting point and strength of the busbar by doping it with a first alloying element. Furthermore, by limiting the product range of the proportion 'a' of the welding area between the busbar and the first surface of the terminal post on the first surface of the terminal post and the proportion 'b' of the first alloying element in the busbar, the heat generated during busbar welding is restricted, preventing the insulating components from melting during the welding process and ensuring the busbar's strength and current carrying capacity.

[0033] To make the above-mentioned objectives, features, and advantages of the embodiments of this utility model more apparent and understandable, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0034] See Figures 1 to 5 As shown, in this application, the x-direction is the first direction and the y-direction is the second direction.

[0035] This utility model provides a battery, referring to... Figures 1 to 5 It includes a cover plate 100, a pole post 200, an insulation component 300, a busbar 400, and a housing 600.

[0036] The housing 600 has a receiving cavity, and one end of the housing 600 has an opening. The receiving cavity is a space for accommodating the encapsulated battery.

[0037] The cover plate 100 is used to seal the opening, and the cover plate 100 has mounting holes 110.

[0038] For example, the side surface of the cover plate 100 facing away from the inside of the battery is recessed to form a mounting platform 130, and mounting holes 110 are formed on the mounting platform 130.

[0039] For example, the mounting platform 130 may be formed by stamping or casting processes, wherein the length of the mounting platform 130 along the second direction is greater than the length along the first direction to form an irregular structure that adapts to the installation requirements of the irregularly shaped pole post 200. The first surface 210 of the pole post 200 extends outside the mounting hole 110 so that the first surface 210 is welded to the busbar 400.

[0040] In other examples, the mounting platform 130 can be rectangular, elliptical, oval, etc.

[0041] An insulating component 300 is disposed between the outer periphery of the pole post 200 and the inner edge of the mounting hole 110. The insulating component 300 is used to isolate the conductive contact between the pole post 200 and the cover plate 100.

[0042] One end of the pole post 200 passes through the mounting hole 110.

[0043] For example, the first surface 210 of the pole post 200 is exposed through the mounting hole 110.

[0044] The busbar 400 is welded to the first surface 210 of the pole post 200; the material used in the busbar 400 includes a first metal and a first alloy element doped in the first metal, wherein the melting point of the first alloy element is higher than that of the first metal.

[0045] Using a first metal doped with a first alloying element as the busbar 400 can increase the strength and corrosion resistance of the busbar 400. While maintaining the strength of the busbar 400, the width of the busbar 400 can be reduced, thereby increasing the distance between the busbar 400 and the edge insulation component 300, which can also achieve the corresponding purpose of protecting the insulation component 300.

[0046] The proportion 'a' of the welding area between the busbar 400 and the first surface 210 of the pole post 200 on the first surface 210 of the pole post 200, and the proportion 'b' of the first alloying element in the busbar 400, satisfy the condition: 0.00001 ≤ a * b ≤ 0.05. Wherein, both the welding area between the busbar 400 and the first surface 210 of the pole post 200 and the area of ​​the first surface 210 are expressed in mm. 2 .

[0047] For example, in the embodiments of this application, a*b can be 0.00001, 0.001, 0.01, 0.02, 0.03, 0.04, 0.05, etc.

[0048] The melting point of busbar 400 increases after doping with the first alloying element, and the welding temperature also needs to be increased accordingly. However, by controlling the product of the proportion 'a' of the welding area of ​​busbar 400 on the first surface 210 of pole 200 and the proportion 'b' of the first alloying element in busbar 400, the length of busbar 400 in the second direction can be controlled. This limits the heat diffused to the insulating component 300 during welding of busbar 400, prevents the insulating component 300 from melting during the welding process of busbar 400, and ensures the rated strength and current carrying capacity of busbar 400. The current carrying capacity refers to the maximum allowable current.

[0049] For example, the first metal can be aluminum, and the first alloying element can be silver, copper, zirconium, or other elements. The first metal can be doped with any of the first alloying elements.

[0050] For example, bus 400 may also be a first metal doped with two or more first alloying elements, wherein the melting point of the first alloying element is greater than the melting point of the first metal.

[0051] For example, the insulating component 300 can be a rubber insulating component, a plastic insulating component, etc.

[0052] For example, refer to Figure 3The proportion 'a' of the welding area between the busbar 400 and the first surface 210 of the pole post 200 on the first surface 210 of the pole post 200 satisfies: 0.05≤a≤0.5;

[0053] And satisfy: a=S1 / S2, where S1 is the welding area between the busbar 400 and the first surface 210 of the pole post 200, and S2 is the area of ​​the first surface 210 of the pole post 200.

[0054] By limiting the proportion of the welding area between the busbar 400 and the first surface 210 of the pole post 200 on the first surface 210 of the pole post 200, the size of the busbar 400 can be limited. When the busbar 400 is welded to the first surface 210 of the pole post 200, it is placed at the center of the first surface 210 of the pole post 200. By limiting a, the distance between the edge of the busbar 400 and the edge of the pole post 200 is maintained, so as to reduce the welding heat radiation to the insulating component 300 at the edge of the pole post 200.

[0055] For example, the proportion 'a' of the welding area between the busbar 400 and the first surface 210 of the pole post 200 on the first surface 210 of the pole post 200 can be 0.05, 0.1, 0.25, 0.3, 0.4, 0.5, etc.

[0056] In some implementations, the content percentage b of the first alloying element in the busbar 400 satisfies: 0.001≤b≤0.02.

[0057] By controlling the content of the first alloying element in the busbar 400, the melting point of the busbar 400 can be controlled, thus preventing the insulation component 300 from melting when the busbar 400 is welded due to an excessively high melting point.

[0058] For example, the content percentage b of the first alloying element in the busbar 400 can be 0.001, 0.01, 0.015, 0.02, etc.

[0059] In some embodiments, the insulating component 300 has a dimension of 2.0 mm to 5.0 mm in the height direction of the battery.

[0060] The dimension of the insulating component 300 in the height direction of the battery is its thickness. By limiting the thickness of the insulating component 300 to between 2.0mm and 5.0mm, short circuits caused by melting during welding due to insufficient thickness are avoided. Furthermore, it reduces the possibility of short circuits caused by current breakdown during subsequent use due to insufficient thickness of the insulating component 300. Additionally, it prevents the insulating component 300 from being too thick, which could hinder heat dissipation from the terminal post 200 through the cover plate 100, thus ensuring good battery heat dissipation.

[0061] For example, the thickness of the insulating component 300 can be 2mm, 3mm, 4mm, 5mm, etc.

[0062] In some implementations, the bus 400 has a dimension of 0.5mm-3.0mm in the height direction of the battery.

[0063] The dimension of bus 400 in the height direction of the battery is the thickness of bus 400. By limiting the thickness of bus 400, the strength of bus 400 is improved and the current carrying capacity of bus 400 is increased.

[0064] For example, the dimensions of the bus 400 in the battery height direction can be 0.5mm, 1mm, 2mm, 3mm, etc.

[0065] In some implementations, refer to Figure 3 and Figure 4 The outer periphery of the pole post 200 has at least one first step portion 220, and the inner edge of the insulating component 300 has at least one second step portion 310. The at least one first step portion 220 and the at least one second step portion 310 correspond to each other and abut against each other.

[0066] The ratio 'a' of the welding area between the busbar 400 and the first surface 210 of the pole post 200 on the first surface 210 of the pole post 200, and the ratio 'b' of the content of the first alloying element in the busbar 400, satisfy the condition: 0.00001≤a*b≤0.055.

[0067] By providing the first step portion 220 and the second step portion 310, the contact area between the pole post 200 and the insulating component 300 is increased. This changes the product of the ratio 'a' of the welding area between the busbar 400 and the first surface 210 of the pole post 200 on the first surface 210 of the pole post 200 and the ratio 'b' of the content of the first alloying element in the busbar 400 to: 0.00001 ≤ a*b ≤ 0.055. This further prevents the insulating component 300 from melting during the welding process of the busbar 400 and ensures the rated strength and current carrying capacity of the busbar 400.

[0068] For example, the first step portion 220 is an annular protrusion structure provided on the pole post 200. The second step portion 310 of the insulating assembly 300 wraps around the edge of the first step portion 220 to increase the contact area between the insulating assembly 300 and the pole post 200 and improve the sealing effect.

[0069] For example, the first step portion 220 can be formed by turning or forging to provide axial positioning and support for the pole post 200 and ensure the stability of the pole post 200.

[0070] For example, the insulating component 300 may be formed using injection molding or overmolding processes.

[0071] The cover plate 100 is also provided with a pressure flange 120 surrounding the mounting platform 130. In addition, the pressure flange 120 is a folded edge surrounding the mounting platform 130, and the first step portion 220 of the pole post 200 is located inside the pressure flange on the mounting platform 130.

[0072] For example, the anti-flanged flange 120 can be formed by stamping or welding.

[0073] For example, the pressing flange 120 includes a first side 121 and a second side 122. The first side 121 surrounds the mounting platform 130 along the height direction of the battery, and the second side 122 is disposed on the first side 121 along a first direction. The first side 121, the second side 122 and the mounting platform 130 form a mounting groove for fixing the first step portion 220. The first step portion 220 of the insulating component 300 is located in the mounting groove, so that the first side 121 presses against the second step portion 310 of the insulating component 300 to achieve the fixing effect of the pole post 200 and the insulating component 300.

[0074] In the embodiments of this application, the first step portion 220 may be configured as two, and the second step portion 310 may be configured as two that are adapted to the first step portion 220.

[0075] The battery also includes an insulating press-fit 500. The insulating press-fit 500, along with at least a portion of the surfaces of the insulating assembly 300 and the compression flange, further enhances the seal. Optionally, the insulating press-fit 500 may be formed using a hot-pressing or bonding process. Optionally, the insulating press-fit 500 may be made of insulating plastic.

[0076] In some examples, the insulating press-fit 500 may cover at least a portion of the surfaces of the second step 310 and the pressing flange 120 by hot pressing or bonding after the pressing flange 120 is pressed against the insulating assembly 300. Thus, by providing the insulating press-fit 500, a covering is formed between the pressing flange 120 and the insulating assembly 300, further improving the overall structural strength and sealing requirements.

[0077] It is understandable that if the pressing flange 120 undergoes plastic deformation under thermal stress, causing partial peeling between the pressing flange 120 and the insulating component 300, the insulating pressing component 500 can still ensure contact strength, thereby ensuring the pressing stability of the pressing flange 120.

[0078] In some implementations, refer to Figure 3 A reinforcing rib 410 is provided on the first surface 210 of the busbar 400 that is away from the pole post 200.

[0079] The ratio 'a' of the welding area between the busbar 400 and the first surface 210 of the pole post 200 on the first surface 210 of the pole post 200, and the ratio 'b' of the content of the first alloying element in the busbar 400, satisfy the condition: 0.00001≤a*b≤0.05.

[0080] The addition of reinforcing rib 410 improves the strength of busbar 400, thereby changing the product of the ratio a of the welding area between busbar 400 and the first surface 210 of pole post 200 on the first surface 210 of pole post 200 and the content ratio b of the first alloying element in busbar 400, further reducing the heat radiated to insulating component 300 during welding.

[0081] For example, the reinforcing rib 410 and the busbar 400 can be integrally die-cast or cast.

[0082] For example, multiple reinforcing ribs 410 can be provided, and the multiple reinforcing ribs 410 are evenly distributed on the side of the busbar 400 opposite to the first surface 210 of the pole post 200.

[0083] For example, the reinforcing rib 410 can also be a mesh structure.

[0084] In some embodiments, the first surface 210 of the bus 400 and / or the pole 200 has a plurality of solder marks 420.

[0085] The minimum distance d between the solder mark 420 and the insulating component 300 in the first direction satisfies: 1.5mm≤d≤5mm.

[0086] For example, in the embodiments of this application, d can be 1.5mm, 2mm, 3mm, 4mm, 5mm, etc.

[0087] Reference Figure 3 Multiple solder marks 420 are provided on the first surface 210 of the busbar 400 and / or the pole 200 to pre-plan the welding position and avoid deviations during the welding process, thereby playing a positioning role.

[0088] By limiting the distance d between the solder mark 420 and the insulating component 300 in the first direction, the distance between the busbar 400 and the insulating component 300 is limited, so as to avoid the busbar 400 getting too close to the insulating component 300 and reduce the heat radiation of the busbar 400 to the insulating component 300 during the soldering process.

[0089] In some embodiments, the welding area between the busbar 400 and the first surface 210 of the pole post 200 is a percentage of the area on the first surface 210 of the pole post 200, and the minimum distance d between the solder mark 420 and the insulating component 300 in the first direction satisfies the following: 0.01(1 / mm)≤a / d≤0.35(1 / mm).

[0090] For example, in the embodiments of this application, a / d can be 0.01 (1 / mm), 0.05 (1 / mm), 0.1 (1 / mm), 0.2 (1 / mm), 0.3 (1 / mm), 0.35 (1 / mm), etc.

[0091] By associating the welding area between the busbar 400 and the first surface 210 of the pole post 200 with the area ratio 'a' on the first surface 210 of the pole post 200, and the minimum distance 'd' between the solder mark 420 and the insulating component 300 in the first direction, the ratio is controlled to be 0.01 (1 / mm) ≤ a / d ≤ 0.35 (1 / mm). This ensures that the welding area of ​​the busbar 400 is correlated with the distance between the solder mark 420 and the insulating component 300. While ensuring the area of ​​the solder mark 420, i.e. the current carrying capacity of the busbar 400, the distance between the solder mark 420 and the insulating component 300 is kept within a reasonable range, thus preventing the welding temperature from melting the insulating component 300 during the welding process.

[0092] In some embodiments, the heat distortion temperature k of the insulating component 300 satisfies: 200℃≤k≤380℃.

[0093] For example, in the embodiments of this application, k can be 200℃, 250℃, 300℃, 350℃, 380℃, etc.

[0094] By limiting the heat distortion temperature of the insulation component 300, the heat resistance of the insulation component 300 is improved, thereby enhancing the insulation effect of the insulation component 300 and preventing the insulation component 300 from deforming or even melting during the welding process of the busbar 400.

[0095] In some embodiments, the electrode post 200 is a copper-aluminum composite electrode post, and the thickness S of the copper material in the copper-aluminum composite electrode post satisfies: 0.01≤S≤0.4.

[0096] The thickness direction of the copper-aluminum composite electrode is the composite direction of the copper-aluminum composite electrode.

[0097] Copper-aluminum composite material is used as electrode 200, and the thickness ratio S of copper material in copper-aluminum composite electrode is 0.01≤S≤0.4. Copper can ensure the current carrying capacity of electrode 200, and aluminum can improve the strength of electrode 200.

[0098] For example, the thickness S of copper material in copper-aluminum composite poles can be 0.1, 0.2, 0.3, 0.4, etc.

[0099] For example, in the embodiments of this application, the thickness of the pole post 200 and the thickness of the copper material in the pole post 200 are both calculated in millimeters.

[0100] In some implementations, the melting point F of bus 400 satisfies: 660℃≤F≤1100℃.

[0101] For example, in the embodiments of this application, F can be 660℃, 700℃, 800℃, 900℃, 1000℃, 1100℃, etc.

[0102] By limiting the melting point temperature of busbar 400, the possibility of heat during the welding process of busbar 400 causing the insulating component 300 to melt is reduced.

[0103] In some implementations, refer to Figure 5 The battery also includes a housing 600 and a battery cell. The housing 600 has a receiving cavity, and the battery cell is disposed in the receiving cavity.

[0104] One end of the housing 600 has an opening, and the cover plate 100 covers the opening.

[0105] The cover plate 100 is fixed on the housing 600 and closes the opening on the housing 600. The battery cell is installed inside the housing 600, and the electrode of the battery cell is connected to the terminal post 200 as the battery cell's electrode.

[0106] This application also provides a battery pack, which may include the battery in the above embodiments.

[0107] It is understood that the battery structure has been described in detail in the above embodiments, and will not be repeated here.

[0108] The battery pack provided in this application embodiment, through the design of the battery described above, ensures the overall structural stability and sealing performance, and guarantees its service life.

[0109] This application also provides a battery device, which can be used in new energy vehicles, electric bicycles, electric trains, aircraft, energy storage cabinets, mobile phones, smart homes, drones, medical devices, etc. This battery device may include the battery or battery pack described in the above embodiments.

[0110] The battery device provided in this application, through the design of the battery or battery pack, ensures power stability and helps improve user satisfaction.

[0111] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0112] In the description of this specification, references to "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0113] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A battery, characterized in that, include: A housing (600) having a receiving cavity and an opening at one end; A cover plate (100) is provided to cover the opening, and the cover plate (100) is provided with mounting holes (110); A pole post (200), one end of which passes through the mounting hole (110); An insulating component (300) is disposed between the outer periphery of the pole post (200) and the inner edge of the mounting hole (110); And a busbar (400) is welded to the first surface (210) of the pole (200); the busbar (400) is made of a first metal and a first alloying element doped in the first metal, wherein the melting point of the first alloying element is higher than the melting point of the first metal. The welding area between the busbar (400) and the first surface (210) of the pole post (200) is a percentage of the first surface (210) of the pole post (200), and the content percentage (b) of the first alloying element in the busbar (400) satisfies the following condition: 0.00001≤a*b≤0.

05.

2. The battery according to claim 1, characterized in that, The welding area between the busbar (400) and the first surface (210) of the pole post (200) is a percentage of the first surface (210) of the pole post (200) such that 0.05 ≤ a ≤ 0.

5. And satisfying: a = S1 / S2, where S1 is the welding area between the busbar (400) and the first surface (210) of the pole post (200), and S2 is the area of ​​the first surface (210) of the pole post (200).

3. The battery according to claim 1, characterized in that, The content percentage b of the first alloying element in the busbar (400) satisfies: 0.001≤b≤0.

02.

4. The battery according to any one of claims 1-3, characterized in that, The insulating component (300) has a dimension of 2.0mm-5.0mm in the height direction of the battery.

5. The battery according to any one of claims 1-3, characterized in that, The busbar (400) has a dimension of 0.5mm-3.0mm in the height direction of the battery.

6. The battery according to any one of claims 1-3, characterized in that, The outer periphery of the pole post (200) has at least one first step portion (220), and the inner edge of the insulating component (300) has at least one second step portion (310). At least one first step portion (220) and at least one second step portion (310) correspond to each other and abut against each other. The welding area between the busbar (400) and the first surface (210) of the pole post (200) is a percentage of the first surface (210) of the pole post (200), and the content percentage (b) of the first alloying element in the busbar (400) satisfies the following condition: 0.00001≤a*b≤0.

055.

7. The battery according to any one of claims 1-3, characterized in that, The busbar (400) has a reinforcing rib (410) on the side facing away from the first surface (210) of the pole post (200); The welding area between the busbar (400) and the first surface (210) of the pole post (200) is a percentage of the first surface (210) of the pole post (200), and the content percentage (b) of the first alloying element in the busbar (400) satisfies the following condition: 0.00001≤a*b≤0.

05.

8. The battery according to any one of claims 1-3, characterized in that, The busbar (400) and / or the pole (200) have a plurality of solder marks (420) on their first surface (210); The minimum distance d between the solder mark (420) and the insulating component (300) in the first direction satisfies: 1.5mm≤d≤5mm.

9. The battery according to claim 8, characterized in that, The welding area between the busbar (400) and the first surface (210) of the pole post (200) is a percentage of the area on the first surface (210) of the pole post (200), and the minimum distance d between the solder mark (420) and the insulating component (300) in the first direction satisfies the following: 0.01 (1 / mm) ≤ a / d ≤ 0.35 (1 / mm).

10. The battery according to any one of claims 1-3, characterized in that, The heat distortion temperature k of the insulating component (300) satisfies: 200℃≤k≤380℃.

11. The battery according to any one of claims 1-3, characterized in that, The electrode (200) is a copper-aluminum composite electrode, and the thickness S of the copper material in the copper-aluminum composite electrode satisfies: 0.01≤S≤0.

4. The thickness direction of the copper-aluminum composite electrode is the composite direction of the copper-aluminum composite electrode.

12. The battery according to any one of claims 1-3, characterized in that, The melting point F of the busbar (400) satisfies: 660℃≤F≤1100℃.

13. A battery pack, characterized in that, include: The battery according to any one of claims 1-12.

14. A battery device, characterized in that, include: The battery according to any one of claims 1-12, or the battery pack according to claim 13.

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