Battery and battery pack

Abstract

Battery characterized in that it comprises the following: a housing (100) wherein the housing (100) has an opening (101) at at least one end; a cover plate (200) which is snapped into the opening of the housing, wherein the edge of the cover plate (200) facing the inside of the housing (100) is provided with a chamfer (201) and the chamfer is at least partially embedded in the interior of the housing, wherein the height of the chamfer (201) along the thickness direction of the cover plate (200) is a1, the thickness of the cover plate (200) is a2, the ratio of a1 to a2 is a, the Vickers hardness of the housing (100) is b, and where b is given in hv and 0.0005 ≤ a / b ≤ 0.014 holds; where the thickness of the side wall at the opening of the housing is d and the thickness d is in the range of 0.15 mm to 1.0 mm.

Description

Technical area

[0001] The present application relates to the technical field of batteries and in particular to a battery and a battery set. Background technology

[0002] Batteries typically consist of a casing and a cover plate. After the battery cells have been installed, the cover plate must be snapped onto the casing, and then a laser is fired into the joint between the cover plate and the casing to weld them together.

[0003] To avoid a gap between the cover and the housing, which would cause the laser to penetrate the housing through the gap during laser welding and damage the housing, a press fit between the cover and the housing is generally used in the prior art to ensure tight contact between the cover and the housing.

[0004] However, since, in the aforementioned prior art, the cover plate and the housing have an interference fit which is influenced by the different types of battery housing materials, the cover plate is difficult to open from the housing and snap together with it if the housing has a relatively high Vickers hardness, leading to difficulties in assembling the battery housing and the cover plate, or the cover plate and the housing deform excessively during assembly, creating a gap that can damage the battery cell during the subsequent welding process. Contents of the utility model

[0005] In light of this, the present application provides a battery and battery pack to solve the problem of the housing and cover being difficult to assemble, or of the cover or housing becoming excessively deformed during assembly, resulting in a gap.The present application provides a battery comprising: a housing, wherein the housing has an opening at at least one end; a cover plate snapped into the opening of the housing, wherein the edge of the cover plate facing the inside of the housing is chamfered such that the size of the underside of the cover plate decreases along the direction facing the housing and the chamfer is at least partially embedded in the interior of the housing, wherein the height of the chamfer along the thickness direction of the cover plate is a1, the thickness of the cover plate is a2, the ratio of a1 to a2 is a, and the Vickers hardness of the housing is b, where b is given in hv and 0.0005 ≤ a / b ≤ 0.014 applies.

[0006] Advantageous effects: The opening on the housing is suitable for mounting with the cover plate, and the arrangement of the chamfer on the cover plate ensures that the side walls of the housing are spread evenly when the cover plate is buckled into the housing.By carefully controlling the relationship between the chamfer height and the Vickers hardness of the housing, the cover plate can be easily inserted into the housing. The higher the Vickers hardness of the housing, the more difficult it is to spread the cover plate away from the housing. A greater chamfer height allows the beveled part to be easily inserted into the housing, so that the cover plate penetrates the housing. Since the thickness of the cover plate is fixed, the thickness of the remaining part of the cover plate, apart from the chamfer, is small. Therefore, when welding the cover plate and housing, the remaining part is easily welded through, leading to failure of the connection between the cover plate and housing.Therefore, in the present embodiment, by controlling the numerical relationship between the ratio a between the height of the chamfer and the height of the cover plate and the Vickers hardness b of the housing, the spreading of the housing side wall of the housing is further facilitated, so that the cover plate can be easily inserted into the housing. Figures

[0007] To more clearly illustrate the specific embodiments of the present application and the technical solutions in the prior art, the figures necessary for use in the specific embodiments and the description of the prior art are briefly presented below. Obviously, the figures described below represent some embodiments of the present application, and general technical personnel in this field can draw further figures based on these without any creative effort. Fig. Figure 1 is a schematic representation of the overall structure of a battery according to an embodiment of the present application; Fig. Figure 2 is a schematic representation of a battery housing structure according to an embodiment of the present application; Fig. Figure 3 is a schematic representation of the cross-sectional structure of a battery according to an embodiment of the present application, illustrating the structure and the positional relationship between a cover plate and a housing; Fig. Figure 4 is a partially enlarged schematic representation of Part A in Fig. 3; Fig. Figure 5 is a schematic representation of the cross-sectional structure of another battery according to an embodiment of the present application, illustrating the structure and the positional relationship between a cover plate and a housing; Fig. Figure 6 is a partially enlarged schematic representation of Part B in Fig. 5; Fig. Figure 7 is a schematic representation of the overall structure of a battery according to an embodiment of the present application, in which the housing is prismatic; Fig. Figure 8 is a schematic representation of the cross-sectional structure of a battery according to an embodiment of the present application, illustrating the structure and positional relationship between the cover plate and the housing when the housing is prismatic. Reference symbols in the figures:

[0008] 100. Housing; 101. Opening; 102. Stepped hole; 200. Cover plate; 201. Chamfer. Specific embodiments

[0009] To clarify the purpose, technical solution, and advantages of the embodiments of the present application, the technical solutions in the embodiments of the present application are described below in conjunction with the attached drawings. It is obvious that the described embodiments are some of the embodiments of the present application, not all of them. Based on the embodiments of the present application, all further embodiments that a person skilled in the art obtains without inventive activity fall within the scope of protection of the present application. Below, one embodiment of the present application is described in conjunction with the... Fig. 1 to 8 described.

[0010] According to one embodiment of the present application, a battery is provided in one aspect, as in the Fig. Figures 1 to 4 show the following: a housing, wherein the housing has an opening at at least one end; a cover plate snapped into the opening of the housing, wherein the edge of the cover plate facing the inside of the housing is chamfered such that the size of the underside of the cover plate decreases along the direction facing the housing and the chamfer is at least partially embedded in the interior of the housing, wherein the height of the chamfer along the thickness direction of the cover plate is a1, the thickness of the cover plate is a2, the ratio of a1 to a2 is a, the Vickers hardness of the housing is b, where b is given in hv, and 0.0005 ≤ a / b ≤ 0.014 applies.

[0011] In this embodiment, the opening in the housing is designed for mounting a cover plate. The cover plate closes the housing opening and forms a receiving space between the cover plate and the housing for arranging the battery cells. In some embodiments, the cover plate can also provide a structural basis for components such as the pole stack assembly, pressure relief mechanism, and injection port. The housing material can be steel, aluminum, or other metals, and the cover plate and housing can be made of the same or different materials. The chamfer on the cover plate ensures uniform spreading of the housing side walls when the cover plate is snapped into the housing.By carefully controlling the relationship between the chamfer height and the Vickers hardness of the housing, the cover plate can be easily inserted into the housing. The higher the Vickers hardness of the housing, the more difficult it is to spread the cover plate away from the housing. A greater chamfer height allows the beveled portion to be easily inserted into the housing, enabling the cover plate to penetrate the housing. Since the thickness of the cover plate is fixed, the thickness of the remaining portion, excluding the chamfer, is small. Therefore, when welding the cover plate and housing together, the remaining portion is easily welded through, leading to insufficient weld penetration and width, and ultimately to failure of the connection between the cover plate and the housing.Therefore, in this embodiment, by controlling the numerical relationship between the ratio a between the height of the chamfer and the height of the cover plate and the Vickers hardness b of the housing, the opening of the housing side wall is further facilitated, so that the cover plate can be easily inserted into the housing; at the same time, the reliability of the connection between the cover plate and the housing is also ensured.

[0012] In the above embodiment, it should be noted that "the size of the side of the cover plate located near the housing decreases in the direction near the housing" means, in particular, that the size of the chamfer along the longitudinal direction of the cover plate is smaller than the size of the remaining part along the thickness direction. Furthermore, the chamfer in the above embodiment can be linear or non-linear.

[0013] In particular, in the above embodiment, the value of a / b can be 0.0005, 0.0008, 0.001, 0.005, 0.011, 0.014, etc.

[0014] In the above embodiment, the angle between the chamfer 201 and the circumferential side wall of the cover plate 200 is not limited. For example, the chamfer 201 can be designed as a linear chamfer, and in particular, the chamfer is designed as an inclined plane such that the length of the cover plate corresponding to the chamfer gradually decreases in the thickness direction of the cover plate to facilitate insertion of the cover plate into the housing, wherein the angle between the chamfer 201 and the circumferential side wall of the cover plate 200 can be 45°, while other angles, such as 60° or 80°, are also possible, and in some embodiments not shown, the chamfer 201 can also be non-linear, for example, arc-shaped.

[0015] Furthermore, the embodiments described above are not limited with respect to the shape of the housing 100. For example, the housing 100 can be cylindrical, with its end located at a position corresponding to the cylindrical end face. In some embodiments not shown, the housing 100 can also have other shapes, such as a square or hexagonal prism, provided that an opening 101 can be provided at the end of the housing 100 and the cover 200 fits into the opening 101 of the housing 100 by press fit. It should be noted that the material of the housing 100 in the embodiments above can be steel or other steel-containing materials.

[0016] In the above examples, it should also be noted that the Vickers hardness measurement methods may refer to the Vickers hardness test method specified in the national standard GB / T 4340, which comprises the following steps: 1. Sample preparation ① Prepare the sample, preferably using a plate cutter or a die-cutting press, and ensure that it is flat and free of deformations or bends. ② Smooth the surface grains with a fine abrasive sponge or fine sandpaper. 2. Testing procedure: ① Calibrate the device using a 500g tool and begin testing. 2. Mount the sample horizontally and stably on the device, place it on the stage, align the lens and turn the focus knob to obtain a clear image. ③ Measure the three data sets and calculate the average as the test result. 3. Criteria for data accuracy: ① After focusing, all surface grains and edges should be clearly visible; 2 The diagonal test line runs tangentially to the four corners; ③ The difference between the diagonal test lengths (d1-d2) is smaller than the longest diagonal d1.

[0017] In one embodiment, as described in the Fig. As shown in 1 to 4, a satisfies the condition 0.1 ≤ a ≤ 0.8 and b lies in the range of 50 hv to 300 hv.

[0018] In particular, a can be 0.1, 0.15, 0.27, 0.5, 0.7 or 0.8 and b can be 50 hv, 60 hv, 80 hv, 150 hv, 175 hv, 223 hv or 300 hv.

[0019] In this embodiment, the height of the chamfer and the thickness of the cover plate are additionally controlled in the range of 0.1 to 0.8, so that the cover plate can more easily spread the opening of the housing and facilitate insertion into the housing.By choosing a ratio a greater than or equal to 0.1, it is ensured that the chamfer 201 on the cover plate 200 has a sufficient height, thus preventing the cover plate 200 from being too difficult to press into the opening 101 of the housing 100 and from becoming stuck in the opening 101 or other adverse situations occurring. Furthermore, by choosing 0.1 ≤ a ≤ 0.8 for the height of the chamfer 201 and the thickness of the cover plate 200, sufficient space remains for the circumferential side edge of the cover plate 200, ensuring that the cover plate 200 sits stably on the opening 101. This prevents the remaining thickness of the circumferential side edge of the cover plate 200 from being too small, which could lead to tilting or warping of the cover plate 200 or to deformation of the housing during welding, thereby preventing the Structural reliability is improved.

[0020] In one embodiment, the housing material comprises steel, and a is in the range of 0.15 to 0.8.

[0021] If the housing material in this embodiment comprises steel, the value of a can be 0.1, 0.25, 0.5, 0.76, or 0.8. The steel housing provides reliable strength and prevents expansion of the battery cells during charging and discharging. While maintaining the same strength, reducing the housing wall thickness allows for more space for the internal battery cells, facilitating the arrangement of larger cells and increasing the battery's energy density. However, the steel housing also increases its stiffness, making it more difficult to open the cover plate. This correspondingly increases the a-value, making it easier to insert the cover plate into the housing. In an embodiment as described in the Fig. Figures 1 to 4 show that the case is made of stainless steel and a is in the range of 0.25 to 0.7, or the case is made of nickel-plated steel and a is in the range of 0.2 to 0.8.

[0022] It should be noted that, according to the definition in GB / T20878-2007, stainless steel is a steel whose main characteristics are rust resistance and corrosion resistance, and which has a chromium content of at least 10.5% and a carbon content of no more than 1.2%. Nickel-plated steel is steel which, after a series of treatments, has a nickel layer several micrometers thick applied to the surface of the steel substrate.

[0023] In this embodiment, the value of a can be 0.25, 0.5, 0.68, or 0.7 if the housing is made of stainless steel; the value of a can be 0.2, 0.27, 0.5, 0.6, or 0.8 if the housing is made of nickel-plated steel. Stainless steel is used as the housing material, which gives the housing greater strength and effectively prevents expansion of the battery cell during charging and discharging, thus reducing the risk of battery deformation. At the same time, due to the high strength of stainless steel, the wall thickness of the housing can be reduced, creating more space for the internal battery cells. This facilitates the arrangement of larger cells and increases the battery's energy density.

[0024] Since the ductility and Vickers hardness of different materials differ in this embodiment, limiting the ratio between the height of the chamfer 201 and the thickness of the cover plate 200 when assembling the housing 100 and the cover plate 200 made of different materials allows the cover plate 200 to be easily pressed into the corresponding housing 100. Furthermore, this reduces the situation where the ratio a is too large or too small, making the cover plate 200 difficult to assemble or weld, thus ensuring product quality.

[0025] In one embodiment, as described in the Fig. As shown in Figures 1 to 4, the angle between the chamfer and the extension line of the circumferential side wall of the cover plate is in the range of 5° to 80°.

[0026] In particular, the angle between the chamfer and the extension line of the circumferential side wall of the cover plate can be in the range of 5°, 10°, 15°, 34.5°, 50° or 80°.

[0027] In this embodiment, the angle between the chamfer 201 and the circumferential side wall of the cover plate 200 is too small, causing the cover plate 200 to encounter significant resistance when inserted into the housing 100, thus complicating assembly. Conversely, a large angle between the chamfer 201 and the circumferential side wall of the cover plate 200 creates a gap at the connection point between the housing and the cover plate, leading to failure of the connection. Furthermore, an excessively large angle of inclination could allow the laser to penetrate the interior of the battery cell during welding of the cover plate and housing, potentially damaging the battery cell. Therefore, in this embodiment, the enclosed angular range between the chamfer 201 and the circumferential side wall of the cover plate 200 is limited to allow the cover plate 200 to be easily inserted into the housing 100 for assembly.

[0028] In one embodiment, as described in the Fig. As shown in Figures 1 to 4, the chamfer 201 is provided along the circumferential contour of the cover plate 200.

[0029] In this embodiment, the chamfer 201 can continuously guide and stretch the circumferential side walls of the housing 100 along the circumferential contour of the cover plate 200 evenly when the cover plate 200 is pressed into the housing 100, thereby preventing the cover plate 200 from becoming stuck as well as from tilting or warping.

[0030] In one embodiment, as described in the Fig. As shown in Figures 1 to 4, the side wall thickness of the housing at the opening d is and satisfies the condition 0.4 ≤ a / d ≤ 6.

[0031] Specifically, the thickness d ranges from 0.15 mm to 1.0 mm, and the value of d can be 0.15 mm, 0.2 mm, 0.35 mm, 0.47 mm, 0.8 mm, or 1.0 mm. The value of a / d can be 0.4, 0.5, 0.78, 1, 1.5, 4.6, 5, or 8.

[0032] In this embodiment, as the thickness of the side wall of the housing 100 increases at the opening 101, the resistance of the cover plate 200 when pressed into the housing 100 increases. Therefore, the ratio between the height of the chamfer 201 and the thickness of the cover plate 200 must be increased accordingly to further reduce the difficulty of pressing the cover plate 200 into the housing 100. This embodiment controls the ratio between the thickness d of the housing 100 and the ratio a to avoid an excessively large ratio of d to a, which would prevent the housing from being pressed smoothly by the cover plate, and likewise an excessively small ratio, such as...It is important to avoid excessively small d or excessively large a, as a too small d can easily allow the laser to penetrate the cover plate during welding, while an excessively large a results in insufficient residual thickness, increasing the risk of laser penetration and compromising product quality. Provided the cover plate 200 can be easily pressed into the housing 100, its stability after assembly is also ensured. Furthermore, a thin housing 100 results in a correspondingly small remaining thickness for the cover plate 200, which can cause the welding laser to penetrate the cover plate 200, damaging the battery cell and potentially deforming the housing 100.

[0033] In one embodiment, the housing has a first end facing the cover plate and a second end facing away from the cover plate, the opening of the housing is located at the first end and the thickness of the side wall of the first end is less than the thickness of the side wall of the second end.

[0034] In particular, the thickness of the case's side wall at the opening is d. For example, a stepped hole 102 is provided at the opening of the case at the first end of the case, so that the thickness of the side wall at the opening of the case is less than the thickness of the side wall away from the opening to facilitate the insertion of the cover plate; the side wall thickness d can also be a gradually increasing amount from top to bottom (i.e., from the side facing the opening of the case to the side facing away from it) along the vertical direction of the battery. For example, the thickness of the case side wall can gradually increase from top to bottom along the height of the case, or the thickness of the case side wall can increase section by section from top to bottom along the height of the case, or the thickness of the case side wall can increase irregularly from top to bottom along the height of the case, etc.

[0035] In this embodiment, the side wall thickness at the opening of the housing is slightly reduced, making it easier to open the cover plate and insert it into the housing; at the same time, d must not be chosen too small to avoid the battery cell being easily penetrated and damaged by the laser during the welding process, and the thickening of the side wall of the housing, except at the opening, ensures the strength of the housing and prevents deformation of the housing that would impair product quality.

[0036] In one embodiment, as described in the Fig. 5 and Fig. As shown in Figure 6, the housing 100 is provided with a stepped hole 102 at the opening 101 and the contour of the stepped hole 102 corresponds to the contour of the opening 101 of the housing 100, wherein the cover plate 200 is adapted to the stepped hole 102 and has an interference fit with the side wall of the housing 100 at the stepped hole 102.

[0037] In this embodiment, the thickness of the housing 100 at the opening 101 is reduced by providing a stepped hole 102 and attaching the cover plate 200 to the stepped hole 102, thus making it easier to press the cover plate 200 into the housing 100. Furthermore, during the laser welding process, the stepped hole 102 ensures that even when the light beam passes through the gap between the cover plate 200 and the housing 100, it only illuminates the bottom of the step of the stepped hole 102 and not the battery cell as readily. This reduces the demands on the welding process and makes welding the cover plate 200 less difficult.

[0038] In one embodiment, the opening area at the end of the housing is S and S is greater than or equal to 500 mm². 2 ; a lies in the range of 0.25 to 0.8.

[0039] It should be noted that the opening area S at the end of the housing is the area of ​​the passage enclosed by the side walls of the housing, and does not include the thickness of the side walls of the housing.

[0040] Furthermore, the value of S can be, in particular, 500 mm. 2 , 800 mm 2 , 950 mm 2 or 1000 mm 2 The value of a can be 0.25, 0.3, 0.52, 0.7 or 0.8.

[0041] Since it is relatively difficult in this embodiment to open the cover plate 200 from the housing 100 if the area of ​​the opening 101 at the end of the housing 100 is large, the area S of the opening 101 at the end of the housing 100 is controlled and the ratio a / b is controlled accordingly to reduce the difficulty of assembling the housing 100 and the cover plate 200 with different opening areas 101.

[0042] In one embodiment, as described in the Fig. As shown in Figures 1 to 6, the housing is cylindrical and a and b satisfy 0.0005 ≤ a / b ≤ 0.01, or the housing is prismatic and a and b satisfy 0.0006 ≤ a / b ≤ 0.01.

[0043] In particular, the prismatic shape can be described as follows Fig. 7 and Fig. 8. The prism can be either square or hexagonal. Furthermore, the value of a / b can be 0.0005, 0.0009, 0.0018, 0.005, or 0.01, particularly if the housing is cylindrical. If the housing is prismatic, the value of a / b can be 0.0006, 0.0008, 0.0018, 0.005, 0.0095, or 0.01.

[0044] In this embodiment, the insertion of the cover plate 200 into the housing differs depending on the shape of the housing 100. For example, compared to the two types of battery housings 100 with prismatic and cylindrical housing 100, the edge position, i.e., the angular position of the cover plate 200, is clamped simultaneously by the side walls on both sides, making it difficult to spread, so the required a and b values ​​differ. This embodiment controls the ratio range of the cylindrical housing 100 and the prismatic housing 100 to ensure that the cover plates 200 of different types of housing 100 can be assembled.

[0045] In one embodiment, the battery further comprises a battery cell, wherein the battery cell comprises a body and a terminal tab, a pole column assembly is provided on the cover plate, the terminal tab comprises a positive terminal tab and a negative terminal tab, one of the positive terminal tabs and the negative terminal tab is electrically connected to the pole column assembly and the other is electrically connected to the cover plate, and a is in the range of 0.25 to 0.8.

[0046] It should be noted that the polar flag is electrically connected to the polar column assembly, where the polar column assembly may refer to a polar column, and the polar flag is directly electrically connected to the polar column; that the polar column assembly may also comprise a polar column and an adapter plate, where the polar flag is directly connected to the adapter plate, and the adapter plate is electrically connected to the polar column, thereby establishing an electrical connection between the polar flag and the polar column assembly.

[0047] In this embodiment, the cover plate serves as the output terminal and is electrically connected to the terminal lug. By controlling the value of 'a', the difficulty of inserting the cover plate into the housing and the interaction force between the cover plate and the housing are reduced, thereby decreasing the risk of deformation during insertion. Since the cover plate is part of the output terminal and must be electrically connected to structures such as the busbar, deformation of the housing can impair the electrical connection between the cover plate and the busbar, creating a risk of cold soldering.

[0048] In the above embodiments, it should be noted that the cathode plate, the anode plate, and the separator are wound or stacked to form a battery cell; the cathode plate comprises a cathode current collector and a layer of cathode active material, and the anode plate comprises an anode current collector and a layer of anode active material. There is no particular restriction regarding the cathode current collector, as long as it is conductive and does not cause any adverse chemical changes in the battery. For example, stainless steel, aluminum, nickel, titanium, burnt carbon, or aluminum or stainless steel surface-treated with carbon, nickel, titanium, silver, etc., may be used; regarding the anode current collector, copper, stainless steel, nickel, titanium, etc., may be used.The following materials may be used; in a specific embodiment, the cathode current collector may be made of aluminum and the anode current collector of copper. The cathode active material layer comprises cathode active materials, such as ternary nickel-cobalt-manganese materials, lithium iron phosphate materials, lithium manganese iron phosphate materials, etc.; the anode active material layer comprises anode active materials, such as synthetic graphite, natural graphite, silicon-based materials, etc.

[0049] In contrast, according to one embodiment of the present application, a battery set is provided which includes at least one of the aforementioned batteries.

[0050] In this embodiment, by using the above-mentioned batteries to form a battery pack and by taking advantage of the benefits of the above-mentioned batteries, the assembly difficulties can be reduced, the structural reliability of the battery pack improved, and the product performance increased.

[0051] Although the embodiments of the present application are described in conjunction with the figures, the person skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations are all within the scope of protection defined by the attached claims. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited non-patent literature

[0000] Standard GB / T 4340

[0016] GB / T20878-2007

[0022]

Claims

[1] Battery, characterized by that it includes the following: a housing (100) wherein the housing (100) has an opening (101) at at least one end; a cover plate (200) which is snapped into the opening of the housing, wherein the edge of the cover plate (200) facing the inside of the housing (100) is provided with a chamfer (201) and the chamfer is at least partially embedded in the interior of the housing, wherein the height of the chamfer (201) along the thickness direction of the cover plate (200) is a1, the thickness of the cover plate (200) is a2, the ratio of a1 to a2 is a, the Vickers hardness of the housing (100) is b, and where b is given in hv and 0.0005 ≤ a / b ≤ 0.014 holds; where the thickness of the side wall at the opening of the housing is d and the thickness d is in the range of 0.15 mm to 1.0 mm. [2] Battery according to claim 1, characterized by, that a satisfies the condition 0.1 ≤ a ≤ 0.8 and / or b lies in the range of 50 hv to 300 hv. [3] Battery according to claim 1, characterized by , that the housing material comprises steel and a is in the range of 0.15 to 0.

8. [4] Battery according to claim 3, characterized by , that the case (100) is made of stainless steel and a is in the range of 0.25 to 0.7, or that the case (100) is made of nickel-plated steel and a is in the range of 0.2 to 0.

8. [5] Battery according to claim 1, characterized by , that the chamfer is designed as an inclined plane and the length of the cover plate corresponding to the chamfer gradually decreases along the thickness direction of the cover plate. [6] Battery according to claim 5, characterized by , that the angle between the chamfer (201) and the extension line of the circumferential side wall of the cover plate (200) is in the range of 5° to 80°. [7] Battery according to claim 1, characterized by, that the chamfer (201) is provided along the circumferential contour of the cover plate (200). [8] Battery according to claim 1, characterized by , that the side wall thickness of the housing (100) at the opening (101) is d and the condition 0.4 ≤ a / d ≤ 6 is satisfied. [9] Battery according to claim 8, characterized by , that the housing has a first end facing the cover plate and a second end facing away from the cover plate, the opening of the housing being at the first end and the thickness of the side wall of the first end being less than the thickness of the side wall of the second end. [10] Battery according to claim 1, characterized by , that the area of ​​the opening (101) at the end of the housing (100) is S and S is greater than or equal to 500 mm2, where a is in the range of 0.25 to 0.

8. [11] Battery according to any one of claims 1 to 10, characterized by, that the housing (100) is cylindrical and a and b satisfy 0.0005 ≤ a / b ≤ 0.01, or the housing (100) is prismatic and a and b satisfy 0.0006 ≤ a / b ≤ 0.

01. [12] Battery according to claim 11, characterized by , that it further comprises a battery cell, wherein the battery cell comprises a body and a terminal flag, the cover plate is provided with a terminal flag assembly, and wherein the terminal flag comprises a positive terminal flag and a negative terminal flag, one of the positive terminal flags and the negative terminal flag is electrically connected to the terminal column assembly and the other is electrically connected to the cover plate, and a is in the range of 0.25 to 0.

8. [13] Battery according to any one of claims 1 to 10, characterized by , that the chamfer (201) is formed as a linear chamfer or as an arc-shaped chamfer. [14] Battery according to any one of claims 1 to 10, characterized by, that the chamfer (201) is arranged continuously along the circumferential contour of the cover plate (200). [15] Battery according to any one of claims 1 to 10, characterized by , that the thickness of the side wall at the opening of the housing is less than the thickness of the side wall away from the opening; or that the thickness of the housing side wall gradually increases from top to bottom along the vertical direction of the housing; or that the thickness of the housing side wall increases section by section from top to bottom along the vertical direction of the housing; or that the thickness of the housing side wall increases irregularly from top to bottom along the height of the housing. [16] Battery according to claim 12, characterized by, that the polar column assembly may refer to a polar column, and the polar flag is directly electrically connected to the polar column; or that the polar column assembly may also comprise a polar column and an adapter plate, wherein the polar flag is directly connected to the adapter plate, and the adapter plate is electrically connected to the polar column, thereby establishing an electrical connection between the polar flag and the polar column assembly. [17] Battery pack, characterized by that it comprises at least one battery according to any one of claims 1 to 16.

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