Core package, battery and battery pack

Abstract

A core package (100) intended for a battery, the core package (100) comprising: an electrode plate assembly (1), wherein the electrode plate assembly (1) comprises a plurality of electrode plates (10), and each of the electrode plates (10) has a tab (2); wherein several of the tabs (2) form a weld embossed area (21) after welding, the height of the folded tabs (2) is H1, and the height of the weld embossed area (21) is H2; the core package (100) further comprises two side surfaces (110) which are opposite one another in the thickness direction, the distance D between the weld embossing region (21) and the side surface (110) being, and the thickness of the core package (100) being d, where: 0.42 ≤ arctan((H1 - H2) / (d - D)) / arctan((H1 - H2) / D) ≤ 1.

Description

Technical area

[0001] The present application relates to the field of battery technology, in particular to a core package, a battery and a battery pack. State of the art

[0002] A battery comprises a core package, which in turn comprises an electrode plate assembly. The electrode plate assembly includes a plurality of electrode plates, each of which is provided with a tab. The plurality of electrode plates each has a corresponding number of tabs that are joined together by ultrasonic welding. However, during the ultrasonic welding process of the tabs, miswelds or incomplete welds can occur, which can compromise the weld quality and the mechanical strength of the joint. This, in turn, can lead to the breakage of the tabs and reduce the safety of the battery cell. Technical problem

[0003] Current technology for ultrasonic welding of multiple tabs can result in defects such as cold solder joints or incomplete welds, which impair weld quality and weld tensile strength. This, in turn, can lead to tab tearing and compromise the safety performance of the battery cell. Disclosure of the application

[0004] In a first aspect, an embodiment of the present application provides a core pack intended for a battery. The core pack comprises an electrode plate assembly including a plurality of electrode plates, each electrode plate having a tab. A plurality of tabs are welded together to form a weld embossed region, wherein the height of the folded tabs is H1 and the height of the weld embossed region is H2. The core pack further comprises two side surfaces opposite each other in the thickness direction, wherein the distance between the weld embossed region and the side surface is D, and the thickness of the core pack is denoted by d. Where: 0.42 ≤ arctan((H1 - H2) / (d - D)) / arctan((H1 - H2) / D) ≤ 1.

[0005] In a second aspect, an embodiment of the present application provides a battery comprising a housing and a core package arranged in the housing, wherein the core package is configured according to the core package described above.

[0006] In a third aspect, an embodiment of the present application provides a battery pack comprising a housing and a plurality of batteries arranged therein, the batteries being configured according to the battery described above. Beneficial effect

[0007] In the present application, in the embodiments, by controlling the height H1 of the folded tabs, the thickness d of the core package, the height H2 of the welded embossed area of ​​the tabs, and the distance D between the welded embossed area and a side edge of the core package, it is ensured that the following condition is satisfied: 0.42 ≤ arctan ((H1 - H2) / (d - D)) / arctan ((H1 - H2) / D) ≤ 1. By conducting a tensile test on the tabs of the core package, it was determined that the tabs of the core package meet the tensile strength requirements. In addition, a drop test of the battery assembled from the core package confirmed that the battery meets the drop test requirements. This not only improves the welding strength of the tabs but also increases the safety of the battery at the same time. Short description of the drawings Fig.1 is a plan view of a stacked electrode plate group unit according to some embodiments of the present application; Fig. 2 is an enlarged partial view of Fig. 1; Fig. 3 is a side view of a core package according to some embodiments of the present application; Fig. 4 is a front view of a core package according to some embodiments of the present application; Fig. 5 is a front view of two interconnected core packages according to some embodiments of the present application; Fig. 6 is a side view of two interconnected core packages according to some embodiments of the present application. Reference symbol:

[0008] 100, core package; 101, first core package; 102, second core package; 110, side surface; 1, electrode plate assembly; 10, electrode plate; 11, positive electrode plate; 12, negative electrode plate; 13, separator; 2, tab; 21, weld embossment area; 211, first weld embossment area; 212, second weld embossment area; 22, positive tab; 23, negative tab; 3, connector. Embodiments

[0009] One embodiment of the present application relates to a battery comprising a housing assembly and a core package. The battery may be a cylindrical battery or a prismatic battery.

[0010] The battery housing assembly comprises a housing and a cover cap, with the cover cap being welded to the open end of the housing. A terminal column is also arranged on the cover cap, which can be a positive terminal column, a negative terminal column, or both positive and negative terminal columns.

[0011] As in the Fig. 1 to Fig.3, the core package 100 includes an electrode plate assembly 1 including a plurality of electrode plate group units. The plurality of electrode plate group units are assembled into a core package by stacking or winding. Each electrode plate group unit includes a positive electrode plate 11, a negative electrode plate 12, and a separator 13, wherein the separator 13 is disposed between and separates the positive electrode plate 11 and the negative electrode plate 12. Each positive electrode plate 11 includes a positive tab 22, and each negative electrode plate 12 includes a negative tab 23. After stacking the plurality of electrode plate group units, the plurality of positive tabs 22 are folded and joined into a unit by ultrasonic welding, while the plurality of negative tabs 23 are also joined into a unit by ultrasonic welding.In this case, a welding embossed area 21 is formed by welding the plurality of positive tabs 22 or the plurality of negative tabs 23.

[0012] As in Fig. 1 and Fig.2, the dimension of each positive electrode plate 11 is less than the dimension of each negative electrode plate 12, which in turn is smaller than the dimension of the separator 13. In a concrete embodiment, which is explained using the example of a prismatic battery, each positive electrode plate 11, each negative electrode plate 12, and each separator 13 are designed as rectangular structures. The length difference L1 between each negative electrode plate 12 and each positive electrode plate 11 is 0.5 mm to 1.5 mm, while the width difference w1 is 0.5 mm to 2.5 mm. The length difference L2 between each separator 13 and each negative electrode plate 12 is 0.5 mm to 1.5 mm, while the width difference w2 is 1 mm to 2 mm.The larger size of the separator 13 compared to the negative electrode plate 12 and the positive electrode plate 11 enables effective insulation between the positive electrode plate 11 and the negative electrode plate 12, thereby preventing short circuits. If the positive electrode plate 11 were larger than the negative electrode plate 12, excess lithium ions would not be able to penetrate the negative electrode plate 12 during charging. This would lead to the deposition of lithium ions from the positive electrode plate 11 on the surface of the negative electrode plate 12, thereby affecting the cycle life of the battery. By dimensioning the negative electrode plate 12 larger than the positive electrode plate 11, lithium precipitation on the surface of the negative electrode plate 12 can be effectively reduced.

[0013] The present application further provides a manufacturing method for a lithium-ion battery. The manufacturing method includes the following steps: manufacturing the positive electrode plate, manufacturing the negative electrode plate, assembling the core package, welding the tabs, and assembling the lithium-ion battery.

[0014] The manufacturing process for the positive electrode plate involves dispersing a positive active material, a conductive agent, and a binder in a solvent (NMP) (N-methylpyrrolidone) and stirring uniformly to form a suspension. The suspension is then applied to the positive current collector and undergoes processes such as drying, cold pressing, punching, and cutting to obtain the positive electrode plate. Suitable positive active materials include lithium iron phosphate, lithium manganese iron phosphate, or NCM lithium cobalt oxide, either individually or in combination. The mass ratio of the positive active material: conductive agent: binder is (94.5%-97%): (1.5%-3%): (1.5%-2.5%).

[0015] The manufacturing process of the negative electrode plate includes: dispersing the negative active material, the conductivity agent and the binder in a certain ratio in a solvent, stirring uniformly to prepare a suspension, applying the suspension to the negative current collector and then performing processes such as drying, cold pressing, punching and cutting to manufacture the negative electrode plate.

[0016] The core package assembly includes: applying the stacking method, wherein the negative electrode plate, the separator, the positive electrode plate and the separator are stacked in repeated order, followed by heat press forming.

[0017] Tab welding: The tabs of the core package typically consist of several overlapping foils. The tab welding is performed using ultrasonic welding to bond the multiple foils into a single unit. The tabs are then either laser welded to the battery terminal post or laser welded to the connector, which is then electrically connected to the terminal post.

[0018] Lithium-ion battery assembly: The core pack is inserted into the case, a cover plate is welded to one end of the case, followed by electrolyte filling, forming, and capacity sorting to complete the battery.

[0019] In the relevant technology, during ultrasonic welding of multiple tabs, defective welds such as cold welds or incomplete welds may occur, which can affect the weld quality and weld tensile strength. This, in turn, can lead to tab breakage and reduce the safety of the battery cell.

[0020] In the embodiments of the present application, as in Fig. 3 and Fig. 4, the core package 100 comprises two opposite side surfaces 110 along the thickness direction of the core package 100. The thickness direction is in Fig.3 as the x-direction. The height of the folded tabs is defined as H1, the height of the weld embossed area 21 formed by welding multiple tabs 2 is H2, the distance between the weld embossed area 21 and a side edge of the core package 100 is D, and the thickness of the core package 100 is d. The design parameters of the core package 100 satisfy the first equation: 0.42 ≤ arctan((H1-H2) / (dD)) / arctan((H1-H2) / D) ≤ 1. In a specific embodiment, the ratio of arctan((H1-H2) / (dD)) to arctan((H1-H2) / D) can take the following values: 0.42, 0.45, 0.48, 0.5, 0.52, 0.55, 0.58, 0.6, 0.62, 0.65, 0.68, 0.7, 0.72, 0.75, 0.78, 0.8, 0.82, 0.85, 0.88, 0.9, 0.92, 0.95, 0.98, 1.0 Value between any two of the above values ​​or a range between any two of the above values.

[0021] The height of the weld embossed area 21 corresponds to the elevation of the weld embossed area 21 in the direction perpendicular to the plane of the tab. The measurement method for the height H2 of the weld embossed area 21 is as follows: The surface of the unwelded tab is taken as the reference plane. Using a precision measuring tool, including a micrometer or height gauge, the vertical distance between the reference plane and the highest point of the weld embossed area 21 is measured. This distance represents the height of the weld embossed area 21.

[0022] In some embodiments, the design parameters of the core package 100 satisfy the second equation H1 - H2 ≤ d / 2. While improving the weld strength of the tab, limiting the position of the weld embossment area helps optimize the space utilization of the battery, ultimately increasing the energy density of the battery.

[0023] In the embodiments of the present application, core pack embodiments that satisfy both the first and second equations are designed, as well as comparative core pack examples that do not satisfy either the first or second equations. Subsequently, the relevant core pack embodiments and comparative core pack examples are processed into batteries to conduct tensile strength tests of the tab weld joint and drop tests of the batteries.

[0024] An embodiment of the present application also provides a test method for determining the weld tensile strength of a battery's tab. The test method comprises the following steps: 1. Specimen mounting: One end of the battery clamp is clamped into the upper clamping fixture of the tensile testing machine, while the other end is secured into the lower clamping fixture. This ensures that the clamp is precisely positioned within the clamping angle of the tensile testing machine and that the clamping force is appropriately adjusted to prevent the clamp from slipping or being damaged. 2. Setting the test parameters: According to the specifications of the battery tab and the test requirements, parameters such as the charging speed and the maximum tensile force value of the tensile testing machine are set. 3. Test execution: The tensile testing machine is started to slowly apply a load to the battery tab. During the loading process, the tensile testing machine records the changes in the tensile force value and the deformation of the tab in real time. The loading is continued until a fracture occurs in the welded area of ​​the tab or until the specified maximum tensile force value is reached. 4. Repeat the test: For each exemplary or comparative example, 10 batteries are tested. The maximum tensile force value of the tab of each battery is recorded to calculate the average weld tensile force value of the tabs for each test case. At the same time, it is checked whether a crack occurs in the weld embossed area of ​​the tab. If a crack is detected, the corresponding weld tensile force value is documented.

[0025] The standard value for the weld tensile strength of the tab is ≥ 60 N.

[0026] The embodiments of the present application also provide a test method for a drop test of a battery. The reference standard for this test method is GB31485-2015. The test method includes: 1. The battery is charged with a constant current of 1C up to the specified discharge voltage of the battery and then switched to constant voltage charging until the charging current drops to 0.05C and charging is stopped. 2. The battery falls freely onto a cement surface from a height of 1.2 m with its positive and negative terminals facing downwards. 3. An observation period of 1 hour. 4. Repeat the test: For each working example or comparative example, 10 pieces of batteries are used for verification, and the success rate of the battery drop test is recorded.

[0027] The present application provides six exemplary batteries that satisfy both the first and second equations, as well as seven comparative examples of batteries that fail to satisfy one or both of the first and second equations. These batteries are subjected to a tab tensile force test and a drop test, and the test results are recorded.

[0028] The respective parameters of the six working examples and the seven comparative examples as well as the results of the tensile force test of the tabs and the drop test of the batteries are shown in Table 1 and Table 2. Table 1: Test example data table 1 First example Second embodiment Third embodiment First comparison example Second comparison example Third comparison example Thickness of the core package / d 23 23 30 16 23 23 Height of the tab / H1 18 18 18 18 24 18 Height of the welding embossing area / H2 8 12 8 8 8 3 Distance of the welding embossing area / D 10 10 10 10 10 10 First equation 0.83 0. 80 0.59 1.31 0.88 0.87 Second equation Fulfilled Fulfilled Fulfilled Not fulfilled Not fulfilled Not fulfilled Welding tensile force / N 64 71 61 58 68 55 Success rate of the drop test / % 100 100 100 70 100 50 Table 2: Test example data table 2 Fourth embodiment 1 Fifth embodiment example Sixth embodiment 1 Fourth comparison example Fifth comparison example Sixth comparison example Seventh comparison example Thickness of the core package / d 26 17 22 23 23 26 24 Height of the tab / H1 22 14 20 18 18 21.5 23 Height of the welding embossing area / H2 10 5.5 9 8 8 3 9 Distance of the welding embossing area / D 13 4.5 10 14 3 3.5 13 First equation 1.00 0.55 0.89 1.35 0.36 0.50 1.10 Second equation Fulfilled Fulfilled Fulfilled Fulfilled Fulfilled Not fulfilled Not fulfilled Welding tensile force / N 67 64 65 56 57 56 70 Success rate of the drop test / % 100 100 100 70 70 50 100

[0029] From the test data of the first, second, third, fourth, fifth, and sixth embodiments shown in Table 1 and Table 2, it can be seen that when the above-mentioned design parameters of the core package, namely the height H1 of the tab 2, the height H2 of the weld embossed portion, the thickness d of the core package, and the distance D of the weld embossed portion 21 to the side surface 110 of the core package simultaneously satisfy the first and second equations, the welding tensile strength of the tab 2 of the core package meets the standard, and the pass rate of the drop test of the battery is 100%.

[0030] It should be noted that the above-mentioned design parameters of the core pack in the second embodiment satisfy both the first and second equations, and there are no risks in the weld tensile strength test of the tab or the drop test of the battery. However, the height of the weld embossed area is too large, which results in a low volumetric space utilization rate inside the battery and thus affects the energy density of the battery. The design parameters of the core pack in the third embodiment also satisfy the first and second equations, and there are no risks in the weld tensile strength test of the tab or the drop test of the battery. However, the excessive thickness d of the core pack causes the tab length of the electrode plate 10 to become too large, thereby reducing the volumetric space utilization rate of the battery and consequently reducing the energy density of the battery.

[0031] From the test data of the first comparative example in Table 1, it can be seen that if the above design parameters of the core package do not meet the first or second equation, the welding tensile strength of the battery cell tab will not reach the standard, resulting in a high risk of tab cracking. At the same time, there is a risk of the battery failing the drop test, which in turn affects the safety of the battery. From the test data of the third comparative example in Table 1, it can be seen that if the above design parameters of the core package do not meet the second equation and the height H2 of the welding embossment area is too small, the welding tensile strength of the battery cell tab will not meet the standard. This increases the risk of tab cracking and may cause the battery to fail the drop test, thereby affecting its safety.It should be noted that the above-mentioned design parameters of the battery cell provided in the second comparison group do not satisfy the second equation, but do satisfy the first equation. At the same time, the height H1 of the folded tab is significantly increased, while the height of the weld embossed area remains essentially unchanged. Although the tab weld tensile strength test and the battery drop test can be passed, the excessively high height H1 of the folded tab leads to excessive empty space within the battery, resulting in an uncompetitive volumetric energy density.

[0032] From the test data of the fourth comparative example and the fifth comparative example in Table 2, it can be seen that when the design parameters of the core pack do not satisfy the first equation, the tab of the battery fails the tensile force test and the battery fails the drop test. From the test data of the sixth comparative example in Table 2, it can be seen that when the design parameters of the battery cell do not satisfy the first equation or the second equation, the tab of the battery fails the tensile force test and the battery fails the drop test. From the test data of the seventh comparative example in Table 2, it can be seen that the tab of the battery passes the tensile force test and the battery passes the drop test even though the design parameters of the core pack do not satisfy the first equation or the second equation.Through analysis, it was found that the height H1 of the tab in the seventh comparative example is too large, which reduces the volume utilization of the core package, which has an adverse effect on increasing the energy density of the battery.

[0033] In some embodiments, with further reference to Fig. 3, the height of the electrode plate assembly is H, and the ratio of the height H1 of the folded tab to the height H of the electrode plate assembly is in the range of 0.02 to 0.13. In one embodiment, the height H of the electrode plate assembly is 80 mm to 180 mm, and the height H1 of the folded tab is 14 mm to 22 mm.

[0034] The height H of the electrode plate assembly can be 80 mm, 100 mm, 120 mm, 150 mm, 180 mm, as well as a value between any two of the above values ​​or a range between any two of the above values, depending on the capacity of the battery.

[0035] Through research, the applicant has found that when the height H1 of the folded tab is less than 14 mm, the area of ​​the weld embossed region where the tab is located is relatively small, which affects the welding strength of the tab. When the height H1 of the folded tab is greater than 22 mm, the space utilization of the battery is relatively low, which in turn affects the energy density of the battery. In a specific embodiment, H1 can be 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, or 22 mm, as well as a value between any two of the above values, or a range between any two of the above values.

[0036] In a specific embodiment, the ratio between H1 and H may be 0.08, 0.10, 0.12, 0.14, 0.16, 0.20, 0.24, 0.28, and a value between any two of the above values ​​or a range between any two of the above values, which is advantageous for maintaining a high energy density of the battery while improving the welding strength of the tab.

[0037] In some embodiments, the ratio of the height H2 of the weld embossed region 21 of the tab 2 to the height H of the electrode plate assembly 1 is 0.02 to 0.13. In one embodiment, the height H of the electrode plate assembly 1 is 80 mm to 180 mm, while the height H2 of the weld embossed region is 4 mm to 10 mm.

[0038] In a specific embodiment, H2 can be 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, or a value between any two of the above values, or a range between any two of the above values. The applicant has determined through research that an H2 value less than 4 mm results in the weld embossing area being too small and the weld strength of the tab being insufficient. If H2 is greater than 10 mm, the height H1 of the tab increases accordingly, which in turn reduces the space utilization of the battery.

[0039] In a specific embodiment, the ratio between H2 and H may be 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.10, 0.11, 0.12, 0.13, as well as a value between any two of the above values ​​or a range between any two of the above values, which is advantageous for maintaining a high energy density of the battery while improving the welding strength of the tab.

[0040] In some embodiments, dD is 4 mm to 22 mm, wherein the thickness d of the core package is 17 mm to 26 mm and the distance D between the weld embossing area of ​​the tab and the side surface 110 of the core package is 4 mm to 13 mm.

[0041] In a specific embodiment, dD can be 4 mm, 6 mm, 8 mm, 10 mm, 12 mm, 15 mm, 17 mm, 19 mm, 21 mm, 22 mm, or a value between any two of the above values, or a range between any two of the above values. By setting dD in the range of 4 mm to 22 mm, the battery can maintain high volume utilization while ensuring the weld strength of the tab.

[0042] In some embodiments, the ratio between the thickness d of the core package and the distance D of the weld embossed area of ​​the tab to the side surface 110 of the core package is 0.15 to 0.5. The thickness d of the core package is in the range of 17 mm to 26 mm, and the distance D of the weld embossed area of ​​the tab to the side surface 110 of the core package is 4 mm to 13 mm.

[0043] In a specific embodiment, d may be 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm, or 26 mm, as well as a value between any two of the above values, or a range between any two of the above values. Through research, the applicant has determined that setting d less than 17 mm results in a relatively low battery capacity, which adversely affects the battery's energy density. Conversely, if d is greater than 26 mm, the battery capacity increases excessively, which in turn leads to an increased risk of battery thermal runaway and thus increases safety risks.

[0044] In a specific embodiment, the distance D between the weld embossed area of ​​the tab and the side surface 110 of the core pack is 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, or 13 mm, and a value between any two of the above values, or a range between any two of the above values. The applicant has determined through research that when the distance D between the weld embossed area of ​​the tab and the side surface 110 of the core pack is less than 4 mm—for example, when the left tab is less than 4 mm from the side surface 110 of the core pack—and the thickness of the core pack remains unchanged, the right tab becomes relatively longer. This results in the coating area of ​​the associated electrode plate 10 on the right side being reduced, which in turn reduces the battery capacity. If the distance D is greater than 13 mm, this impairs the volumetric utilization of the battery.

[0045] In a specific embodiment, the ratio between the thickness d of the core stack and the distance D of the weld embossed area of ​​the tab to the side surface 110 of the core stack is 0.15, 0.18, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, or 0.5, and a value between any two of the above values, or a range between any two of the above values. If the ratio between the thickness d of the core stack and the distance D of the weld embossed area of ​​the tab to the side surface 110 of the core stack is within the above range, this can contribute to both increasing the energy density of the battery and improving the weld strength of the tab, thus increasing the safety of the battery.

[0046] In some embodiments, the first weld embossed region 211 is formed after welding a portion of the positive tabs 22 or the negative tabs 23, while the second weld embossed region 212 is formed after welding another portion of the positive tabs 22 or the negative tabs 23, wherein the first weld embossed region 211 and the second weld embossed region 212 are arranged at a distance from each other. The number of weld embossed regions of the tabs is two, which corresponds to discontinuous welding. If only a single weld embossed region is provided, this corresponds to the continuous welding of all positive tabs 22 or negative tabs 23 at the same weld embossed region. During the continuous welding process, the welding heat continuously increases, which can easily lead to explosive weld seam formation, i.e., a crack or rupture of the weld embossed region.By arranging two or more weld embossed areas, wherein first a part of the tabs is welded to form the first weld embossed area 211 and then another part of the tabs is welded to form the second weld embossed area 212, excessive heat accumulation due to continuous welding can be effectively avoided.

[0047] In some embodiments, as in the Fig. 5 and Fig.As shown in Figure 6, the core pack 100 includes a first core pack 101 and a second core pack 102 connected in parallel. The battery includes a connector 3, one end of which is connected to the tabs of the first core pack 101, while the other end is connected to the tabs of the second core pack 102, so that the two core packs 100 are connected in parallel via the connector 3. By configuring the battery with two core packs connected in parallel, not only can the capacity of the battery be increased, but also the current output capability can be improved and reliability increased. For example, in the event of a failure of one of the core packs, the other core pack can continue to function.

[0048] In a concrete embodiment, as in Fig.6, the first core package 101 and the second core package 102 are stacked one on top of the other along their thickness direction, wherein the merging direction of the core packages in the y-direction according to Fig. 6. The distance L between the connecting piece 3 and the side surface 110 of the first core pack 101 or the second core pack 102 is 7.5 mm to 9.0 mm. This contributes to increasing the welding strength between the connecting piece 3 and the tabs of the first core pack 101 or the second core pack 102 and improves the volumetric utilization efficiency of the battery.

[0049] In a first aspect, an embodiment of the present application provides a core pack intended for a battery. The core pack comprises an electrode plate assembly including a plurality of electrode plates, each electrode plate having a tab. A plurality of tabs are welded together to form a weld embossed region, wherein the height of the folded tabs is H1 and the height of the weld embossed region is H2. The core pack further comprises two side surfaces opposite each other in the thickness direction, wherein the distance between the weld embossed region and the side surface is D, and the thickness of the core pack is denoted by d. Where: 0.42 ≤ arctan((H1 - H2) / (d - D)) / arctan((H1 - H2) / D) ≤ 1.

[0050] In one embodiment, H1 - H2 ≤ d / 2.

[0051] In one embodiment, the height of the electrode plate assembly is H, and the ratio of H1 to H is in the range of 0.08 to 0.28; and / or 14 mm ≤ H1 ≤ 22 mm.

[0052] In one embodiment, the ratio of H2 to H is 0.02 to 0.13; and / or 4 mm ≤ H2 ≤ 10 mm.

[0053] In one embodiment, 4 ≤ d - D ≤ 22.

[0054] In one embodiment, the ratio of D to d is in the range of 0.15 to 0.5; and / or 17 mm ≤ d ≤ 26 mm; and / or 4 mm ≤ D ≤ 13 mm.

[0055] In one embodiment, a part of the tabs forms a first weld embossed area after welding, another part forms a second weld embossed area, wherein the first and the second weld embossed area are arranged at a distance from one another.

[0056] In one embodiment, the core pack comprises a first and a second core pack connected in parallel, and the battery comprises a connector, one end of the connector being connected to the tabs of the first core pack and the other end being connected to the tabs of the second core pack.

[0057] In a second aspect, an embodiment of the present application provides a battery comprising a housing and a core package arranged in the housing, wherein the core package is formed according to the core package described above.

[0058] In a third aspect, an embodiment of the present application provides a battery pack comprising a housing and a plurality of batteries arranged therein, the batteries being configured according to the battery described above. QUOTES CONTAINED IN THE DESCRIPTION

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

[0000] GB 31485-2015

[0026]

Claims

[1] A core package (100) intended for a battery, the core package (100) comprising: an electrode plate assembly (1), wherein the electrode plate assembly (1) comprises a plurality of electrode plates (10), and each of the electrode plates (10) has a tab (2); wherein several of the tabs (2) form a weld embossed area (21) after welding, the height of the folded tabs (2) is H1, and the height of the weld embossed area (21) is H2; the core package (100) further comprises two side surfaces (110) which are opposite one another in the thickness direction, the distance D between the weld embossing region (21) and the side surface (110) being, and the thickness of the core package (100) being d, where: 0.42 ≤ arctan((H1 - H2) / (d - D)) / arctan((H1 - H2) / D) ≤ 1. [2] Core package (100) according to claim 1, wherein H1 - H2 ≤ d / 2. [3] Core package (100) according to claim 2, wherein the height of the electrode plate assembly (1) is H and the ratio of H1 to H is in the range of 0.08 to 0.

28. [4] Core package (100) according to claim 2 or 3, wherein H1 satisfies the following range: 14 mm ≤ H1 ≤ 22 mm. [5] Core package (100) according to claim 2, wherein the height of the electrode plate assembly (1) is H and the ratio of H2 to H is in the range of 0.02 to 0.

13. [6] Core package (100) according to claim 2 or 5, wherein H2 satisfies the following range: 4 mm ≤ H2 ≤ 10 mm. [7] Core package (100) according to claim 1, wherein: 4 ≤ d - D ≤ 22. [8] Core package (100) according to claim 7, wherein the ratio of D to d is in the range of 0.15 to 0.

5. [9] Core package (100) according to claim 7 or 8, wherein d satisfies the following range: 17 mm ≤ d ≤ 26 mm. [10] Core package (100) according to claim 7 or 8, wherein D satisfies the following range: 4 mm ≤ D ≤ 13 mm. [11] Core package (100) according to one of claims 1 to 10, wherein a part of the tabs (2) forms a first weld embossed region (211) after welding and a further part of the tabs (2) forms a second weld embossed region (212) after welding, wherein the first weld embossed region (211) and the second weld embossed region (212) are arranged at a distance from one another. [12] Core package (100) according to claim 11, wherein the core package (100) comprises a first core package (101) and a second core package (102) connected in parallel to each other, wherein the core package comprises a connecting piece (3) whose one end is connected to the tab (2) of the first core package (101) and whose other end is connected to the tab (2) of the second core package (102). [13] Core package (100) according to claim 12, wherein the first core package (101) and the second core package (102) are arranged one above the other in the thickness direction of the core package (100), and the distance L between the connecting piece (3) and the side surface (110) of the first core package (101) or the side surface (110) of the second core package (102) is in the range of 7.5 mm to 9.0 mm. [14] The core package (100) according to any one of claims 1 to 13, wherein the plurality of electrode plates (10) comprises a plurality of positive electrode plates (11) and a plurality of negative electrode plates (12), the positive electrode plates (11) and the negative electrode plates (12) being rectangular, and the length difference L1 between the negative electrode plates (12) and the positive electrode plates (11) being in the range of 0.5 mm to 1.5 mm, and the width difference w1 between the negative electrode plates (12) and the positive electrode plates (11) being in the range of 0.5 mm to 2.5 mm. [15] The core package (100) according to claim 14, wherein the electrode plate assembly (1) further comprises a separator (13), wherein the separator (13) is rectangular in shape and the length difference L2 between the separator (13) and the negative electrode plates (12) is in the range of 0.5 mm to 1.5 mm, and the width difference w2 between the separator (13) and the negative electrode plates (12) is in the range of 1.0 mm to 2.0 mm. [16] Battery comprising: a housing; a core package (100) arranged in the housing, wherein the core package (100) is designed according to one of claims 1 to 15. [17] Battery pack comprising: a housing; a plurality of batteries, wherein the plurality of batteries are arranged in the housing, and wherein the batteries are formed according to claim 16.

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