Battery shell assembly and battery

Abstract

The utility model relates to the technical field of batteries, and provides a battery shell assembly and a battery. The battery shell assembly comprises: a battery shell, wherein a pole through hole is formed in the battery shell; a part of the first pole structure is arranged in the pole through hole in a penetrating manner, and the first pole structure comprises a copper layer and an aluminum layer which are connected with each other; wherein the first pole structure comprises a connecting section, a limiting section and a protruding section, the limiting section is connected to the circumferential outer surface of the connecting section, the protruding section is arranged in a protruding mode from the connecting section, the limiting section and the protruding section form steps, the protruding section comprises at least part of a copper layer and part of an aluminum layer, and the aluminum layer is arranged in the direction X, penetrating through the battery shell, of the pole through hole. The minimum thickness of the copper layer included in the protruding section is a, the height of the step is b, and a / b is larger than or equal to 0.025 and smaller than or equal to 1.33, so that the risk of exposure of the aluminum layer can be effectively reduced, and the use performance of the battery can be effectively improved.

Description

[0001] This case is Application No. 202420870336.2, Application Date 2024.04.24, Invention Name Battery Shell Assembly and Battery. TECHNICAL FIELD

[0002] The utility model relates to battery technology field especially relates to a battery shell assembly and battery. BACKGROUND

[0003] In related technologies, a battery can include a pole structure. For a negative pole structure, a copper-aluminum structure can be used for composite forming. However, due to the differences in material properties of copper and aluminum, such as differences in ductility or hardness, the copper layer in the pole structure may have a local thickness that is too thin, leading to aluminum leakage and causing the pole assembly to be subject to electrochemical corrosion. SUMMARY

[0004] The utility model provides a kind of battery shell assembly and battery, to improve the use performance of battery shell assembly.

[0005] According to one aspect of the utility model, a battery shell assembly is provided, comprising:

[0006] A battery shell, the battery shell is provided with a pole through hole;

[0007] A first pole structure, part of the first pole structure is arranged in the pole through hole, and the first pole structure includes a copper layer and an aluminum layer connected together;

[0008] The first pole structure includes a connecting section, a limiting section and a protruding section. The limiting section is connected to the circumferential outer surface of the connecting section, and the orthogonal projection of the limiting section on the surface of the battery shell provided with the pole through hole is arranged around the pole through hole. The protruding section is protrudingly arranged from the connecting section. The limiting section and the protruding section form a step. The protruding section includes at least part of the copper layer and part of the aluminum layer. At least part of the copper layer is located on the side of the protruding section away from the connecting section to cover the aluminum layer. In the direction X of the pole through hole penetrating the battery shell, the minimum thickness of the copper layer included in the protruding section is a, the height of the step is b, and 0.025≤a / b≤1.33.

[0009] The battery shell assembly of the utility model one embodiment includes battery shell and first pole post structure, first pole post structure sets up in the pole post through -hole of battery shell. The copper layer of first pole post structure can be connected with the battery cell, and the aluminum layer can be used for connecting with the busbar. The limiting section of first pole post structure is connected to the circumferential outer surface of connecting section, and the convex section is protrudingly arranged from the side of connecting section towards the battery cell, so that the limiting section and the convex section can form a step, the convex section includes at least part of the copper layer and part of the aluminum layer, in the direction X of the pole post through -hole through the battery shell, the minimum thickness of the copper layer included in the convex section is a, the height of the step is b, the ratio of the minimum thickness a of the copper layer included in the convex section to the height b of the step is too small, the copper layer is too thin, the risk of aluminum leakage is increased, which leads to the risk of corrosion of the aluminum layer of first pole post structure, affects the strength of first pole post structure and the overall sealing performance of battery, the ratio of the minimum thickness a of the copper layer included in the convex section to the height b of the step is too large, because the positive pole post and the negative pole post adopt different materials, the conductivity rate of aluminum is poorer than that of copper, so the copper layer is too thick, although the strength can be guaranteed, but due to the difference of transmission rate of the positive pole post and the negative pole post, the resistance difference is large, so the rate and the cycle performance of the battery will be reduced, and the production cost of first pole post structure is increased, and 0.025≤a / b≤1.33 can effectively reduce the risk of exposure of the aluminum layer, and can effectively improve the use performance of the battery shell assembly.

[0010] According to another aspect of the utility model, a kind of battery is provided, including above-mentioned battery shell assembly and battery cell, battery cell is arranged in battery shell, copper layer is electrically connected with battery cell, at least part of copper layer is arranged in aluminum layer side close to battery cell.

[0011] The battery of one embodiment of the utility model includes battery shell, electric core and first pole post structure, electric core sets up in battery shell, first pole post structure sets up in the pole post through -hole of battery shell, electric core is connected with first pole post structure electricity. The copper layer of first pole post structure can be connected with electric core, and the aluminum layer can be used for connecting with busbar. The limiting section of first pole post structure is connected to the circumferential outer surface of connecting section, and the convex section is protrudingly arranged from the side of connecting section towards electric core, so that the limiting section and the convex section can form a step, the convex section includes at least part of the copper layer and part of the aluminum layer, in the direction X of the pole post through -hole through the battery shell, the minimum thickness of the copper layer included in the convex section is a, the height of the step is b, the ratio of the minimum thickness a of the copper layer included in the convex section to the height b of the step is too small, the copper layer is too thin, the risk of aluminum leakage increases, which leads to the risk of corrosion of the aluminum layer of the first pole post structure, affects the strength of the first pole post structure and the overall sealing performance of the battery; the ratio of the minimum thickness a of the copper layer included in the convex section to the height b of the step is too large, because the positive pole post and the negative pole post adopt different materials, the conductivity rate of aluminum is poorer than that of copper, so the copper layer is too thick, although the strength can be guaranteed, due to the difference in transmission rate of the positive pole post and the negative pole post, the resistance difference is large, so the rate and cycle performance of the battery will be reduced, and the production cost of the first pole post structure is increased, and 0.025≤a / b≤1.33 can effectively reduce the risk of exposure of the aluminum layer and effectively improve the use performance of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to better understand the present disclosure, reference can be made to the embodiments shown in the following drawings. The components in the drawings are not necessarily to scale, and related elements can be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, related elements or components can have different settings as known in the art. Furthermore, in the drawings, the same reference numerals represent the same or similar components throughout the various drawings. Among them:

[0013] Figure 1 is a structural schematic diagram of a battery according to an exemplary embodiment;

[0014] Figure 2 is a partial cross-sectional structural schematic diagram of a battery according to another exemplary embodiment;

[0015] Figure 3 is a partial cross-sectional structural schematic diagram of a battery according to another exemplary embodiment;

[0016] Figure 4 is a cross-sectional structural schematic diagram of a first pole post structure of a battery according to an exemplary embodiment;

[0017] Figure 5is a sectional structure schematic diagram of a battery according to another exemplary embodiment;

[0018] Figure 6 is a structure schematic diagram of an electric core of a battery according to an exemplary embodiment;

[0019] Figure 7 is a structure schematic diagram of an electric core of a battery according to another exemplary embodiment.

[0020] The reference signs are explained as follows:

[0021] 10, battery shell; 11, pole post through hole; 12, fixed part; 121, fixed section; 122, pressing section; 13, cover plate; 14, shell piece; 20, electric core; 21, first pole lug; 22, second pole lug; 30, first pole post structure; 31, copper layer; 32, aluminum layer; 33, connecting section; 34, limiting section; 35, step; 351, corner area; 36, groove; 37, protruding section; 38, plugging piece; 40, sealing piece; 41, insulating piece; 50, second pole post structure; 60, adapter piece. DETAILED DESCRIPTION

[0022] The technical solutions in the example embodiments of the present disclosure will be described clearly and completely in combination with the drawings of the example embodiments of the present disclosure. The example embodiments described herein are only for illustrative purposes, and are not used to limit the protection scope of the present disclosure, so it should be understood that various modifications and changes can be made to the example embodiments without departing from the protection scope of the present disclosure.

[0023] In the description of the present disclosure, unless explicitly specified and limited, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance; the term "multiple" refers to two or more than two; the term "and / or" includes any combination and all combinations of one or more associated listed items. In particular, referring to "the" object or "one" object is also intended to represent one of the possible multiple such objects.

[0024] Unless otherwise specified or explained, the terms "connection", "fixation" and the like should be understood broadly, for example, "connection" can be fixed connection, or detachable connection, or integrally connected, or electrically connected, or signal connected; "connection" can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances.

[0025] Further, in the description of the present disclosure, it needs to be understood that the orientation words such as "upper", "lower", "inner", "outer" and the like described in the example embodiments of the present disclosure are described in the angle shown in the drawings, and should not be understood as the limitation of the example embodiments of the present disclosure. It also needs to be understood that in the context, when referring to one element or feature connected to another element (one or more) "on", "under", or "inner", "outer", it can not only be directly connected to another element (one or more) "on", "under", or "inner", "outer", but also indirectly connected to another element (one or more) "on", "under", or "inner", "outer" through intermediate elements.

[0026] One embodiment of the utility model provides a kind of battery, please refer to Figures 1 to 7 , battery includes: battery shell 10, pole hole 11 is provided on battery shell 10;First pole structure 30, part of first pole structure 30 is arranged in pole hole 11, and first pole structure 30 includes copper layer 31 and aluminum layer 32 connected;Wherein, first pole structure 30 includes connecting section 33, limiting section 34 and convex section 37, limiting section 34 is connected to the circumferential outer surface of connecting section 33, and the orthographic projection of limiting section 34 on the surface of battery shell 10 where pole hole 11 is arranged around pole hole 11, convex section 37 is arranged by connecting section 33, limiting section 34 and convex section 37 form step 35, convex section 37 includes at least part of copper layer 31 and part of aluminum layer 32, and at least part of copper layer 31 is located in the side of convex section 37 away from connecting section 33, to cover aluminum layer 32, in the direction X that pole hole 11 penetrates battery shell 10, the minimum thickness of copper layer 31 included in convex section 37 is a, the height of step 35 is b, 0.025≤a / b≤1.33.

[0027] The battery shell assembly of one embodiment of the utility model includes battery shell 10 and first pole post structure 30, first pole post structure 30 is arranged in the pole post through hole 11 of battery shell 10. The copper layer 31 of first pole post structure 30 can be used to be connected with electric core, and the aluminum layer 32 can be used to be connected with busbar. The limiting section 34 of first pole post structure 30 is connected to the circumferential outer surface of connecting section 33, and the protruding section 37 is protrudingly arranged by connecting section 33, so that the limiting section 34 and the protruding section 37 can form a step 35, the protruding section 37 includes at least part of the copper layer 31 and part of the aluminum layer 32, in the direction X of the pole post through hole 11 through battery shell 10, the minimum thickness of the copper layer 31 included in the protruding section 37 is a, the height of the step 35 is b, the ratio of the minimum thickness a of the copper layer 31 included in the protruding section 37 and the height b of the step 35 is too small, the copper layer 31 is too thin, the risk of aluminum leakage increases, which leads to the risk of corrosion of the aluminum layer 32 of the first pole post structure 30, affects the strength of the first pole post structure 30 and the overall sealing performance of the battery. The ratio of the minimum thickness a of the copper layer 31 included in the protruding section 37 and the height b of the step 35 is too large, because the positive pole post and the negative pole post adopt different materials, the conductivity rate of aluminum is poorer than that of copper, so the copper layer 31 is too thick, the strength can be guaranteed, but due to the difference between the transmission rates of the positive pole post and the negative pole post, the resistance difference is large, so the rate and cycle performance of the battery will be reduced, and the production cost of the first pole post structure 30 is increased, and 0.025≤a / b≤1.33 can effectively reduce the risk of exposure of the aluminum layer 32, and can effectively improve the use performance of the battery shell assembly.

[0028] It should be noted that, as shown in Figure 2 The battery shell 10 is provided with a pole post through hole 11, and the first pole post structure 30 is arranged in the pole post through hole 11, so that the first pole post structure 30 is fixed on the battery shell 10.

[0029] As shown in Figures 2 to 5 The first pole post structure 30 includes a copper layer 31 and an aluminum layer 32 connected with each other, and the copper layer 31 and the aluminum layer 32 can be connected with the electric core 20 and the busbar respectively, for example, the copper layer 31 can be connected with the copper tab of the electric core 20, and the aluminum layer 32 can be connected with the aluminum busbar, so as to realize the electrical connection of at least two batteries. The copper layer 31 can include pure copper or copper alloy, and the aluminum layer 32 can include pure aluminum or aluminum alloy, for example, aluminum-manganese alloy, aluminum-magnesium alloy, etc.

[0030] As shown in Figures 2 to 4As shown, the first pole structure 30 includes a connecting section 33, a limiting section 34, and a protruding section 37, the limiting section 34 is connected to the circumferential outer surface of the connecting section 33, that is, the limiting section 34 extends out of the circumferential outer surface of the connecting section 33, and the protruding section 37 is protrudingly arranged from one side of the connecting section 33 towards the battery cell 20, so that the limiting section 34 and the protruding section 37 form a step 35, at this time, it can be considered that the end face of the limiting section 34 towards the battery cell 20 and the circumferential outer surface of the protruding section 37 form the step 35. As shown in the figure, Figure 4 As shown, the part of the upper part of the dashed line can be considered as the connecting section 33 and the limiting section 34, and the part of the lower part of the dashed line can be considered as the protruding section 37, the protruding section 37 includes the copper layer 31 and the aluminum layer 32.

[0031] The limiting section 34 is arranged around the pole through hole 11 on the surface of the battery shell 10 where the pole through hole 11 is arranged, so that the limiting section 34 can be fixed on the battery shell 10, the arrangement of the protruding section 37 can conveniently form the electrical connection between the battery cell 20 and the first pole structure 30, the connecting section 33 can ensure the overcurrent capacity of the first pole structure 30, thereby ensuring the safe use performance of the battery, and the connecting section 33 can be used to form electrical connection with other batteries through bus bars.

[0032] The protruding section 37 includes at least part of the copper layer 31 and part of the aluminum layer 32, and at least part of the copper layer 31 is located on the side of the protruding section 37 away from the connecting section 33 to cover the aluminum layer 32, so that the copper layer 31 forms protection for the aluminum layer 32, and the copper layer 31 can be arranged to cover the aluminum layer 32.

[0033] As shown in the figure, Figure 2 As shown in the figure, along the direction X in which the pole through hole 11 penetrates the battery shell 10, the minimum thickness of the copper layer 31 included in the protruding section 37 can be represented as a, the height of the step 35 can be represented as b, and the ratio of the minimum thickness a of the copper layer 31 included in the protruding section 37 to the height b of the step 35 can be 0.025, 0.03, 0.035, 0.04, 0.045, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, 1.05, 1.2, 1.25, 1.28, 1.3, 1.31, 1.32, or 1.33, and the like.

[0034] In one embodiment, as shown in the figure, Figure 2As shown in FIGS. 1 and 2, the limiting section 34 is lapped on the battery shell 10, and at least part of the protruding section 37 is arranged in the pole post through hole 11, which not only facilitates the arrangement of the first pole post structure 30, so that the limiting section 34 forms a limiting connection with the battery shell 10, but also facilitates the electrical connection between the protruding section 37 and the battery cell 20, and to some extent, the connection distance between the protruding section 37 and the battery cell 20 can be shortened.

[0035] The limiting section 34 is lapped on the side of the battery shell 10 away from the battery cell 20, that is, a part of the first pole post structure 30 can be located outside the battery shell 10, thereby forming a limiting fixation with the battery shell 10, improving the fixation ability of the first pole post structure 30.

[0036] In one embodiment, the battery shell 10 is provided with a fixing portion 12, at least part of the fixing portion 12 is arranged around the pole post through hole 11, and the fixing portion 12 fixes the first pole post structure 30, so as to ensure that the first pole post structure 30 can be stably arranged on the battery shell 10, improving the safe use performance of the battery.

[0037] The fixing portion 12 can be riveted to the first pole post structure 30, or the fixing portion 12 can be interference fit with the first pole post structure 30, or the fixing portion 12 can be threadedly connected with the first pole post structure 30.

[0038] In one embodiment, as shown in FIGS. 1 and 2, Figure 2 and Figure 5 The fixing portion 12 is bent into a fixing section 121 and a pressing section 122, the fixing section 121 is arranged on the battery shell 10, and the pressing section 122 is arranged on the limiting section 34, so that at least part of the limiting section 34 is clamped between the pressing section 122 and the battery shell 10, thereby ensuring the connection stability of the first pole post structure 30, avoiding the first pole post structure 30 from being separated from the battery shell 10, and effectively improving the safe use performance of the battery.

[0039] As shown in FIGS. 1 and 2, Figure 5 The battery shell 10 is provided with a fixing portion 12, which can be welded to the battery shell 10, or the fixing portion 12 can be integrally formed on the battery shell 10. At least part of the fixing portion 12 is arranged around the pole post through hole 11, thereby facilitating the fixing of the fixing portion 12 to the first pole post structure 30, improving the assembly efficiency of the battery.

[0040] The fixed part 12 can be bent into a fixed section 121 and a pressing section 122, so that the pressing section 122 is pressed on the first pole structure 30, and the first pole structure 30 is clamped between the pressing section 122 and the battery shell 10. At this time, a certain angle is formed between the fixed section 121 and the pressing section 122, so that the fixed section 121 is arranged on the battery shell 10, and the pressing section 122 is pressed on the first pole structure 30. In this way, the first pole structure 30 can be effectively prevented from being separated from the battery shell 10, thereby ensuring the safe use performance of the battery.

[0041] The first pole structure 30 is arranged on the battery shell 10 by penetrating the pole hole 11. The first pole structure 30 and the battery shell 10 can be insulated, for example, the first pole structure 30 and the battery shell 10 can be insulated by an insulating structure, or the first pole structure 30 and the battery shell 10 can be insulated by an insulating coating.

[0042] In one embodiment, the ratio of the minimum thickness c of the pressing section 122 to a is 0.2-10, that is, the ratio of the minimum thickness c of the pressing section 122 to the minimum thickness a of the copper layer 31 included in the protruding section 37 can be 0.2-10. On the basis of reducing the risk that the copper layer 31 easily leaks the aluminum layer 32, the pressing section 122 can also ensure effective fixation and limiting of the first pole structure 30, thereby improving the safe use performance of the battery.

[0043] In combination Figure 5 As shown, the minimum thickness of the pressing section 122 can be represented as c. If the ratio of the minimum thickness c of the pressing section 122 to the minimum thickness a of the copper layer 31 included in the protruding section 37 is too small, the strength of the first pole structure 30 is too high, and the pressing section 122 is difficult to limit, which is not conducive to improving the fixation performance of the first pole structure 30. If the ratio of the minimum thickness c of the pressing section 122 to the minimum thickness a of the copper layer 31 included in the protruding section 37 is too large, the copper layer 31 is easy to leak the aluminum layer 32, which increases the risk of corrosion, and is not conducive to ensuring the service life of the battery.

[0044] The ratio of the minimum thickness c of the pressing section 122 to the minimum thickness a of the copper layer 31 included in the protruding section 37 can be 0.2, 0.3, 0.4, 0.5, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, 1.05, 1.2, 1.25, 1.28, 1.3, 1.31, 1.32, 1.4, 1.5, 1.8, 2, 2.2, 2 4, 2.5, 2.8, 3, 3.2, 3.4, 3.5, 3.8, 4, 4.2, 4.4, 4.5, 4.8, 5, 5.2, 5.4, 5.5, 5.8, 6, 6.2, 6.4, 6.5, 6.8, 7, 7.2, 7.4, 7.5, 7.8, 8, 8.2, 8.4, 8.5, 8.8, 9, 9.2, 9.4, 9.5, 9.8 or 10, etc.

[0045] In one embodiment, such as Figure 5 As shown, the battery housing assembly also includes a seal 40, at least a portion of which is disposed between the first terminal structure 30 and the battery housing 10, thereby forming a sealed protection between the first terminal structure 30 and the battery housing 10, preventing the inside and outside of the battery housing 10 from being connected through the terminal through hole 11.

[0046] At least a portion of the seal 40 is disposed between the step 35 and the battery casing 10. The step 35 has a corner region 351, at least a portion of which is in contact with the seal 40. The radius of the corner region 351 is 0.12mm-1.48mm. This not only facilitates the forming of the corner region 351, but also ensures that the seal 40 forms a reliable seal between the first pole post structure 30 and the battery casing 10, thus avoiding battery safety risks.

[0047] Combination Figure 5 As shown, the corner area 351 can contact the seal 40. The corner area 351 of the step 35 can be considered as the transition area between the end face of the limiting section 34 facing the cell 20 and the circumferential outer surface of the protruding section 37. The R-angle of the corner area 351 can be considered as being cut along the center line direction of the first pole post structure 30, thereby forming an arc between the outer edge of the limiting section 34 and the outer edge of the protruding section 37. The radius of the arc is the size of the R-angle of the corner area 351.

[0048] The R corner size of the corner region 351 can be 0.12 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, or 1.48 mm, etc. If the R corner size of the corner region 351 is too large, it can affect the sealing between the first pole structure 30 and the battery shell 10, and easily cause a battery safety risk; if the R corner size of the corner region 351 is too small, it is not only not conducive to structure forming, but also can cause stress concentration, and can damage the sealing member 40, which is not conducive to sealing protection.

[0049] The first pole structure 30 is cut along the radial direction in the direction X of penetrating the battery shell 10 through the pole hole 11, the cross section of the cut first pole structure 30 is placed under the image measuring instrument, and the function of measuring the radius of the image measuring instrument is used to take points (3-5 measurement points can be taken) at the R corner of the corner region 351, and then the size of the R corner of the corner region 351 is obtained.

[0050] In one embodiment, the ratio of the initial thickness of the sealing member 40 to the R corner size of the corner region 351 is 0.6-15, which not only can effectively control the sealing performance between the sealing member 40, the first pole structure 30 and the battery shell 10, ensure the safe use of the battery, and can reduce the risk of aluminum layer 32 leakage in the corner region 351.

[0051] The initial thickness of the sealing member 40 can be considered as the thickness size obtained after the sealing member 40 is taken out of the battery and the sealing member 40 is out of the compressed state, and the aging problem of the sealing member 40 after long-term use is not considered here.

[0052] If the ratio of the initial thickness of the sealing member 40 to the R corner size of the corner region 351 is too small, the sealing between the first pole structure 30 and the battery shell 10 is weak, the electrolyte flows out to the aluminum layer 32 to cause corrosion of the first pole structure 30, and affects the use performance of the battery; if the ratio of the initial thickness of the sealing member 40 to the R corner size of the corner region 351 is too large, the corner region 351 is prone to aluminum leakage, and may cause an electrochemical corrosion safety risk.

[0053] The ratio of the initial thickness of the sealing member 40 to the R angle size of the corner region 351 can be 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, 1.05, 1.2, 1.25, 1.28, 1.3, 1.31, 1.32, 1.4, 1.5, 1.8, 2, 2.2, 2.4, 2.5, 2.8, 3, 3.2, 3.4, 3.5, 3.8, 4, 4.2, 4.4, 4.5, 4.8, 5, 5.2, 5.4, 5.5, 5.8, 6, 6.2, 6.4, 6.5, 6.8, 7, 7.2, 7.4, 7.5, 7.8, 8, 8.2, 8.4, 8.5, 8.8, 9, 9.2, 9.4, 9.5, 9.8, 10, 10.2, 10.5, 10.8, 11, 11.2, 11.5, 11.8, 12, 12.2, 12.5, 12.8, 13, 13.2, 13.5, 13.8, 14, 14.2, 14.5, 14.8, or 15, and the like.

[0054] In one embodiment, as shown in FIG. 1, an insulating member 41 can be arranged between the battery shell 10 and the first pole structure 30. Figure 5

[0055] In one embodiment, the minimum thickness a of the copper layer 31 included in the protruding section 37 is 0.1 mm-2 mm, which can not only reduce the risk of aluminum leakage, but also balance the current transmission rate of the positive pole and the negative pole.

[0056] If the minimum thickness a of the copper layer 31 included in the protruding section 37 is too small, the thickness of the protruding section 37 at the corner region 351 of the step 35 is too thin during the forming process, which increases the risk of local aluminum leakage and increases the corrosion risk of the first pole structure 30. If the minimum thickness a of the copper layer 31 included in the protruding section 37 is too large, the current transmission rate between the positive pole and the negative pole is greatly different, which is not conducive to the operation of the battery.

[0057] The minimum thickness a of the copper layer 31 included in the protruding section 37 can be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, or 2 mm, and the like.

[0058] In one embodiment, the height b of the step 35 is 1.52 mm-3.9 mm, which can not only facilitate the electrical connection between the copper layer 31 and the battery cell 20, but also reduce the risk of aluminum leakage, thereby ensuring the safe use performance of the battery. ​

[0059] The height b of the step 35 is too large, and the protruding height of the protruding section 37 is large. During the forming process, the copper layer 31 is thinned, and the local copper layer 31 is too thin, the aluminum layer 32 leaks out, and the first pole structure 30 is corroded; the height b of the step 35 is too small, which is not conducive to the subsequent electrical connection between the copper layer 31 and the battery cell 20.

[0060] The height b of the step 35 can be 1.52 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, 3.6 mm, 3.7 mm, 3.8 mm, 3.85 mm, or 3.9 mm, etc.

[0061] In one embodiment, the step 35 has a corner region 351, and the ratio of the R angle size of the corner region 351 to a is 0.05-15. On the basis of reducing the risk of corrosion of the aluminum layer 32, the cycle performance of the battery can also be effectively controlled, thereby improving the safe use performance of the battery.

[0062] The ratio of the R angle size of the corner region 351 to a is too small, the corner region 351 is not easy to push the material, and the local thinning may occur, which is prone to corrosion risk. In addition, the positive and negative poles are made of different materials, and the conductivity of aluminum is lower than that of copper. Therefore, the copper layer 31 is too thick, the strength can be guaranteed, but due to the difference in transmission rate between the positive and negative poles, the resistance difference is large, and the rate and cycle performance of the battery will be reduced. The ratio of the R angle size of the corner region 351 to a is too large, and the copper layer 31 is too thin, so the copper layer 31 is easy to leak aluminum, which causes corrosion risk. Due to the too large R angle of the corner region 351, the subsequent sealing performance of the first pole structure 30 is affected.

[0063] The ratio of the R corner size of the corner region 351 to a can be 0.05, 0.08, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, 1.05, 1.2, 1.25, 1.28, 1.3, 1.31, 1.32, 1.4, 1.5, 1.8, 2, 2.2, 2.4, 2.5, 2.8, 3, 3.2, 3.4, 3.5, 3.8, 4, 4.2, 4.4, 4.5, 4.8, 5, 5.2, 5.4, 5.5, 5.8, 6, 6.2, 6.4, 6.5, 6.8, 7, 7.2, 7.4, 7.5, 7.8, 8, 8.2, 8.4, 8.5, 8.8, 9, 9.2, 9.4, 9.5, 9.8, 10, 10.2, 10.5, 10.8, 11, 11.2, 11.5, 11.8, 12, 12.2, 12.5, 12.8, 13, 13.2, 13.5, 13.8, 14, 14.2, 14.5, 14.8, or 15, and the like.

[0064] In an embodiment, the R corner size of the corner region 351 is 0.1 mm-1.5 mm, which not only facilitates the molding of the corner region 351 and reduces the risk of aluminum leakage, but also ensures that the first pole structure 30 and the battery shell 10 are conveniently sealed, thereby avoiding the risk of battery safety.

[0065] In an embodiment, the ratio of the minimum thickness a of the copper layer 31 included in the protruding section 37 to the Brinell hardness of the copper layer 31 is 0.0015 mm-0.1 mm. If the ratio of the minimum thickness a of the copper layer 31 included in the protruding section 37 to the Brinell hardness of the copper layer 31 is too small, the corner region 351 is prone to aluminum leakage, and if the Brinell hardness of the copper layer 31 is too large, the material is not easily pushed, resulting in uneven local material; if the ratio of the minimum thickness a of the copper layer 31 included in the protruding section 37 to the Brinell hardness of the copper layer 31 is too large, the conductivity of aluminum is poorer than that of copper, so the copper layer 31 is too thick, the strength can be guaranteed, but due to the difference in transmission rate between the positive and negative poles, the resistance difference is large, which reduces the rate and cycle performance of the battery, and increases the overall manufacturing cost of the first pole structure 30.

[0066] The ratio of the minimum thickness a of the copper layer 31 included in the protruding section 37 to the Brinell hardness of the copper layer 31 can be 0.0015 mm, 0.002 mm, 0.003 mm, 0.004 mm, 0.005 mm, 0.006 mm, 0.007 mm, 0.008 mm, 0.01 mm, 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, or 0.1 mm, and the like.

[0067] In one embodiment, the ratio of the Brinell hardness of the copper layer 31 to the Brinell hardness of the aluminum layer 32 is 0.4-4, which not only ensures the overall structural strength of the first pole structure 30, but also reduces the risk of aluminum leakage, thereby effectively improving the safe use performance of the first pole structure 30.

[0068] If the ratio of the Brinell hardness of the copper layer 31 to the Brinell hardness of the aluminum layer 32 is too small, the first pole structure 30 is relatively weak after the internal battery cell 20 collides with the first pole structure 30, which affects the overall structural strength. If the ratio of the Brinell hardness of the copper layer 31 to the Brinell hardness of the aluminum layer 32 is too large, the copper layer 31 is not easy to push the material, resulting in the risk of corrosion of the corner area 351 due to aluminum leakage.

[0069] The ratio of the Brinell hardness of the copper layer 31 to the Brinell hardness of the aluminum layer 32 can be 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, 1.05, 1.2, 1.25, 1.28, 1.3, 1.31, 1.32, 1.4, 1.5, 1.8, 2, 2.2, 2.4, 2.5, 2.8, 3, 3.2, 3.4, 3.5, 3.8, or 4, and the like.

[0070] In one embodiment, along the direction X in which the pole hole 11 penetrates the battery shell 10, the ratio of the minimum thickness of the aluminum layer 32 to the minimum thickness of the copper layer 31 in the region where the connecting section 33 and the protruding section 37 are located is 0.5-80, which not only reduces the risk of aluminum leakage, but also controls the consistency of the positive and negative pole transmission rates.

[0071] In combination with Figure 4 As shown in the figure, along the direction X in which the pole hole 11 penetrates the battery shell 10, the minimum thickness of the aluminum layer 32 in the region where the connecting section 33 and the protruding section 37 are located can be represented as a1, and the minimum thickness of the copper layer 31 can be represented as a.

[0072] In combination with Figure 5 As shown in the figure, along the direction X in which the pole hole 11 penetrates the battery shell 10, the minimum thickness of the aluminum layer 32 in the region where the connecting section 33 and the protruding section 37 are located can be represented as d, and the minimum thickness of the copper layer 31 can be represented as a.

[0073] If the ratio of the minimum thickness of the aluminum layer 32 to the minimum thickness of the copper layer 31 in the region where the connecting section 33 and the protruding section 37 are located is too large, the copper layer 31 has a risk of corrosion of the first pole structure 30 due to aluminum leakage. If the ratio of the minimum thickness of the aluminum layer 32 to the minimum thickness of the copper layer 31 is too small, the positive and negative pole resistance transmission rates of the battery are inconsistent.

[0074] In the region where the connecting section 33 and the protruding section 37 are located, the ratio of the minimum thickness of the aluminum layer 32 to the minimum thickness of the copper layer 31 can be 0.5, 0.6, 0.8, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 28, 30, 32, 35, 38, 40, 42, 45, 48, 50, 52, 55, 58, 60, 62, 65, 68, 70, 72, 75, 78, or 80, and the like.

[0075] In one embodiment, along the direction X in which the pole post through hole 11 penetrates the battery shell 10, the minimum thickness of the aluminum layer 32 included in the protruding section 37 is d, and a / d is 0.03-2. On the basis of ensuring the structural strength of the protruding section 37, aluminum leakage can be avoided, and the problem of a large difference in electron transmission rate between the positive pole post and the negative pole post can be avoided.

[0076] In combination with FIGS. 1-3, Figure 4 and Figure 5 As shown in FIGS. 1-3, along the direction X in which the pole post through hole 11 penetrates the battery shell 10, the minimum thickness of the aluminum layer 32 included in the protruding section 37 can be represented as d, and the ratio of the minimum thickness a of the copper layer 31 included in the protruding section 37 to the minimum thickness d of the aluminum layer 32 included in the protruding section 37 can be 0.03, 0.05, 0.08, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, 1.05, 1.2, 1.25, 1.28, 1.3, 1.31, 1.32, 1.4, 1.5, 1.8, or 2, and the like.

[0077] In one embodiment, the copper layer 31 and the aluminum layer 32 are integrally formed, and 0.03≤a / b. Not only can the copper layer 31 and the aluminum layer 32 be quickly formed, but the risk of aluminum leakage at the integrally formed corner of the copper layer 31 and the aluminum layer 32 is increased, the ductility of aluminum is better, and the flow rate difference of the material strip during the forming process of the two is large. By setting the copper layer 31 to be relatively thick, that is, the minimum thickness a of the copper layer 31 can be relatively large, the risk of aluminum leakage can be effectively reduced.

[0078] The integrally formed setting of the copper layer 31 and the aluminum layer 32 means that after the materials of the two are prepared, they are formed by a common forming method, and thus are referred to as integrally formed setting.

[0079] For example, the first pole post structure 30 is cold upset formed, or the first pole post structure 30 is extrusion formed. Not only can the overall internal resistance of the first pole post structure 30 be reduced, but the overall manufacturing efficiency of the first pole post structure 30 can be improved, and the cost of the first pole post structure 30 can be reduced.

[0080] Both cold heading forming or extrusion forming can be considered as deforming aluminum material and copper material and then extruding them together, thereby forming the first pole structure 30 in which the aluminum layer 32 and the copper layer 31 are connected. In the process of forming the step 35 during the cold heading forming or extrusion forming, the copper layer 31 in the corner area 351 can be controlled not to be easily pushed, thereby maximizing the uniform distribution of the material and reducing the risk of local thinning that is prone to corrosion.

[0081] In an embodiment, the side of the first pole structure 30 away from the protruding section 37 is formed with a groove 36; wherein the aluminum layer 32 forms at least part of the groove wall of the groove 36, which not only facilitates the forming of the protruding section 37 and improves the overall thickness of the protruding section 37, but also avoids the copper layer 31 being too thin to leak aluminum, thereby improving the safe use performance of the battery.

[0082] The side of the first pole structure 30 away from the protruding section 37 is formed with a groove 36, that is, the side of the first pole structure 30 away from the battery cell 20 is formed with a groove 36.

[0083] In an embodiment, along the direction X in which the pole through-hole 11 penetrates the battery shell 10, the depth e of the groove 36 is 1.5mm-6mm, which can not only reduce the risk of the copper layer 31 being too thin to leak aluminum, but also effectively control the height dimension of the first pole structure 30, thereby controlling the space occupancy of the first pole structure 30 of the battery.

[0084] In combination with Figure 5 As shown, along the direction X in which the pole through-hole 11 penetrates the battery shell 10, the depth of the groove 36 can be represented as e. If the depth e of the groove 36 is too small, the copper layer 31 is prone to be locally too thin, which may result in the risk of aluminum leakage. If the depth e of the groove 36 is too large, the overall strength of the first pole structure 30 is weak, the first pole structure 30 occupies a relatively large space of the battery, and the overall space utilization of the battery is low.

[0085] The depth e of the groove 36 can be 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5mm, 5.1mm, 5.2mm, 5.3mm, 5.4mm, 5.5mm, 5.6mm, 5.7mm, 5.8mm, 5.9mm or 6mm, etc.

[0086] In one embodiment, 0.15mm 2 ≤ a x e ≤ 12mm 2 If the product of the minimum thickness a of the copper layer 31 included in the protruding section 37 and the depth e of the groove 36 is too small, the minimum thickness a of the copper layer 31 included in the protruding section 37 is too small, or the depth e of the groove 36 is too small, the depth e of the groove 36 is small, more material is needed during the forming process of the protruding section 37 to ensure the thickness, resulting in a small overall thickness in the protruding section 37, and the risk of local thinning of the copper layer 31 and leakage of aluminum increases; if the product of the minimum thickness a of the copper layer 31 included in the protruding section 37 and the depth e of the groove 36 is too large, the first pole structure 30 occupies a larger space inside the battery.

[0087] The product of the minimum thickness a of the copper layer 31 included in the protruding section 37 and the depth e of the groove 36 can be 0.15mm 2 , 0.2mm 2 , 0.3mm 2 , 0.4mm 2 , 0.5mm 2 , 0.6mm 2 , 0.7mm 2 , 0.8mm 2 , 0.9mm 2 , 1mm 2 , 1.2mm 2 , 1.5mm 2 , 1.8mm 2 , 2mm 2 , 2.5mm 2 , 3mm 2 , 3.5mm 2 , 4mm 2 , 4.5mm 2 , 5mm 2 , 5.5mm 2 , 6mm 2 , 6.5mm 2 , 7mm 2 , 7.5mm 2 , 8mm 2 , 8.5mm 2 , 9mm 2 , 9.5mm 2 , 10mm 2 , 10.5mm 2 , 11mm 2 , 11.5mm 2 , or 12mm 2 , and the like.

[0088] In one embodiment, as Figure 5As shown, the recess 36 can be provided with a blocking piece 38, the blocking piece 38 is connected with the aluminum layer 32, and the blocking piece 38 can be used to connect with the bus bar.

[0089] In one embodiment, the step 35 has a corner area 351, the copper layer 31 forms at least part of the corner area 351, and the copper layer 31 has a minimum thickness of the corner area 351 ≥ 0.01 mm, so as to effectively reduce the risk of copper layer 31 aluminum leakage at the corner area 351, thereby improving the safe use performance of the first pole structure 30.

[0090] The minimum thickness of the copper layer 31 at the corner area 351 can be 0.01 mm, 0.05 mm, 0.08 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm or 2 mm, etc.

[0091] In one embodiment, along the direction Y perpendicular to the direction in which the pole hole 11 penetrates the battery shell 10, the width f of the step 35 is 1.5-5 mm, the smaller the width f of the step 35, the greater the risk of aluminum leakage of the protruding section 37; the greater the width f of the step 35, the smaller the flow area of the bottom surface of the first pole structure 30, and the more serious the local heat production, resulting in increased internal resistance.

[0092] In combination Figure 2 As shown, along the direction Y perpendicular to the direction in which the pole hole 11 penetrates the battery shell 10, the width of the step 35 can be represented as f, and the width f of the step 35 can be 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, 3.6 mm, 3.7 mm, 3.8 mm, 3.9 mm, 4 mm, 4.1 mm, 4.2 mm, 4.3 mm, 4.4 mm, 4.5 mm, 4.6 mm, 4.7 mm, 4.8 mm, 4.9 mm or 5 mm, etc.

[0093] In one embodiment, part of the aluminum layer 32 is located in the copper layer 31, and the connection area of the aluminum layer 32 and the copper layer 31 includes a curved surface, a / b ≤ 1.25, so as to ensure the connection strength between the aluminum layer 32 and the copper layer 31, avoid the interface separation of the aluminum layer 32 and the copper layer 31, and thus improve the safe use performance of the first pole structure 30.

[0094] Combining Figures 2 to 5 As shown in the figure, the hanging angle connecting area of the aluminum layer 32 and the copper layer 31 can be curved, thereby ensuring the connecting strength between the aluminum layer 32 and the copper layer 31.

[0095] One embodiment of the utility model also provides a battery, the battery includes above-mentioned battery shell subassembly and electric core 20, electric core 20 sets up in battery shell 10, copper layer 31 is electrically connected with electric core 20, and at least part of copper layer 31 sets up in the one side of aluminum layer 32 close to electric core 20.

[0096] The battery of one embodiment of the utility model includes battery shell 10, electric core 20 and first pole structure 30, electric core 20 sets up in battery shell 10, first pole structure 30 sets up in the pole through hole 11 of battery shell 10, and electric core 20 is electrically connected with first pole structure 30. Copper layer 31 of first pole structure 30 can be connected with electric core 20, and aluminum layer 32 can be used to be connected with busbar. The limiting section 34 of first pole structure 30 is connected to the circumferential outer surface of connecting section 33, and the convex section 37 is protrudingly arranged from the side of connecting section 33 towards electric core 20, so that the limiting section 34 and the convex section 37 form a step 35, the convex section 37 includes at least part of copper layer 31 and part of aluminum layer 32, along the direction X of the pole through hole 11 penetrating through the battery shell 10, the minimum thickness of the copper layer 31 included in the convex section 37 is a, the height of the step 35 is b, the ratio of the minimum thickness a of the copper layer 31 included in the convex section 37 to the height b of the step 35 is too small, the copper layer 31 is too thin, the risk of aluminum leakage is increased, which leads to the risk of corrosion of the aluminum layer 32 of the first pole structure 30, affects the strength of the first pole structure 30 and the overall sealing performance of the battery; the ratio of the minimum thickness a of the copper layer 31 included in the convex section 37 to the height b of the step 35 is too large, because the positive pole and the negative pole are made of different materials, the conductivity of aluminum is poorer than that of copper, so the copper layer 31 is too thick, the strength can be guaranteed, but due to the difference in transmission rate between the positive pole and the negative pole, the resistance difference is large, which will reduce the rate and cycle performance of the battery, and increase the production cost of the first pole structure 30, and 0.025≤a / b≤1.33 can effectively reduce the risk of exposure of the aluminum layer 32 and effectively improve the use performance of the battery.

[0097] In one embodiment, as Figure 1As shown, the battery shell assembly further comprises a second pole structure 50 arranged on the battery shell 10, the electric core 20 comprises a first and a second polar lug 21 and 22 with opposite polarity, the first polar lug 21 is electrically connected with the first pole structure 30, and the second polar lug 22 is electrically connected with the second pole structure 50, the first pole structure 30 is a negative output terminal, and the second pole structure 50 is a positive output terminal; wherein the area of the end surface of the second pole structure 50 away from the electric core 20 is greater than the area of the end surface of the first pole structure 30 away from the electric core 20, which not only can increase the overcurrent area of the second pole structure 50, but also can balance the current transmission rate of the first pole structure 30 and the second pole structure 50, so as to avoid local lithium precipitation caused by the inconsistent current transmission rate of the pole piece of the electric core 20.

[0098] The first pole structure 30 is a negative output terminal, and the second pole structure 50 is a positive output terminal, that is, the first pole structure 30 can be a negative pole, and the second pole structure 50 can be a positive pole.

[0099] As shown in Figure 6 , the first and second polar lugs 21 and 22 can be extended from the same end of the electric core 20, or, as shown in Figure 7 , the first and second polar lugs 21 and 22 can be extended from opposite ends of the electric core 20.

[0100] The first and second polar lugs 21 and 22 can be directly connected with the first and second pole structures 30 and 50, respectively; or the first and second polar lugs 21 and 22 can be directly connected with the first and second pole structures 30 and 50, respectively, through two adapter pieces.

[0101] For example, as shown in Figure 2 , the first polar lug 21 can be directly connected with the first pole structure 30. Or, as shown in Figure 3 , the first polar lug 21 can be connected with the first pole structure 30 through an adapter piece 60.

[0102] In one embodiment, the electric core 20 comprises a first polar lug 21 directly contacting a copper layer 31, the first polar lug 21 comprises copper, and 0.028≤a / b, so as to ensure that the copper layer 31 can have a certain thickness, thereby ensuring the structural strength of the first pole structure 30, so as to ensure the safe use performance of the battery.

[0103] After the first tab 21 directly contacts and connects the copper layer 31, the connection strength between the first tab 21 and the first pole structure 30 needs to be ensured, so in addition to avoiding aluminum leakage and a small difference between positive and negative currents, the overall strength of the first tab 21 and the first pole structure 30 also needs to be considered, and the proportion of the aluminum layer 32 should not be too high, otherwise the strength of the first pole structure 30 will be weak, which may cause risks. Therefore, the ratio of the minimum thickness a of the copper layer 31 included in the protruding section 37 to the height b of the step 35 can be appropriately controlled.

[0104] The first tab 21 includes copper, and the first tab 21 directly contacts and connects the copper layer 31, so that the connection strength between the first tab 21 and the copper layer 31 can be ensured, and the connection between the first tab 21 and the copper layer 31 can be facilitated, for example, the first tab 21 and the copper layer 31 are welded.

[0105] In one embodiment, as shown in FIG. 1, the battery case 10 can include a cover plate 13 and a case piece 14, the cover plate 13 and the case piece 14 are connected, and the first pole structure 30 and the second pole structure 50 can be arranged on the cover plate 13. Figure 1

[0106] In some embodiments, the battery case 10 can include a cover plate 13 and a case piece 14, the cover plate 13 and the case piece 14 are connected, and the first pole structure 30 and the second pole structure 50 can be arranged on the side of the case piece 14 opposite to the cover plate 13.

[0107] In some embodiments, the battery case 10 can include a cover plate 13 and a case piece 14, the cover plate 13 and the case piece 14 are connected, and the first pole structure 30 and the second pole structure 50 can be arranged on the side of the case piece 14 opposite to the cover plate 13.

[0108] It should be noted that the battery case assembly can be a cover plate assembly, for example, the battery case 10 can include a cover plate 13, and the battery case 10 does not include a case piece 14; or the battery case assembly can be a cover plate assembly, for example, the battery case 10 can include a case piece 14, and the battery case 10 does not include a cover plate 13.

[0109] It should be noted that the battery includes an electrode and an electrolyte, and is a minimum unit capable of electrochemical reactions such as charging / discharging. The electrode refers to a unit formed by winding or laminating a stack portion including a first electrode sheet, a separator, and a second electrode sheet. When the first electrode sheet is a positive electrode sheet, the second electrode sheet is a negative electrode sheet. The polarity of the first electrode sheet and the second electrode sheet can be interchanged. The first electrode sheet and the second electrode sheet are coated with an active material.

[0110] ​In one embodiment, the battery can be a quadrangular prism type battery, which mainly refers to a prism shape in appearance, but is not strictly limited to whether each side of the prism is a straight line in the strict sense, and the corners between the sides can be circularly transitioned.

[0111] The battery can be a laminated battery, which is not only convenient to group, but also can be processed to obtain a battery with a relatively long length. Specifically, the battery cell is a laminated battery cell, and the battery cell has a first pole piece, a second pole piece opposite to the first pole piece in electrical property, and a diaphragm piece arranged between the first pole piece and the second pole piece, so that a plurality of pairs of the first pole piece and the second pole piece are stacked to form the laminated battery cell.

[0112] Alternatively, the battery can be a winding type battery, that is, the first pole piece, the second pole piece opposite to the first pole piece in electrical property, and the diaphragm piece arranged between the first pole piece and the second pole piece are wound to obtain a winding type battery cell.

[0113] In one embodiment, the battery can be a cylindrical battery, or the battery can be a hexagonal prism type battery. The battery can be a winding type battery, that is, the first pole piece, the second pole piece opposite to the first pole piece in electrical property, and the diaphragm piece arranged between the first pole piece and the second pole piece are wound to obtain a winding type battery cell.

[0114] One embodiment of the utility model also provides a battery pack, and the battery pack comprises the battery.

[0115] The battery of the battery pack in one embodiment of the utility model includes battery shell 10, electric core 20 and first pole post structure 30, electric core 20 is arranged in battery shell 10, first pole post structure 30 is arranged in the pole post through-hole 11 of battery shell 10, and electric core 20 is electrically connected with first pole post structure 30. The copper layer 31 of the first pole post structure 30 can be connected with the electric core, and the aluminum layer 32 can be used to be connected with the busbar. The limiting section 34 of the first pole post structure 30 is connected to the circumferential outer surface of the connecting section 33, and the protruding section 37 is protrudingly arranged from the side of the connecting section 33 towards the electric core 20, so that the limiting section 34 and the protruding section 37 form a step 35. The protruding section 37 includes at least part of the copper layer 31 and part of the aluminum layer 32. In the direction X along which the pole post through-hole 11 penetrates the battery shell 10, the minimum thickness of the copper layer 31 included in the protruding section 37 is a, the height of the step 35 is b, and the ratio of the minimum thickness a of the copper layer 31 included in the protruding section 37 to the height b of the step 35 is too small. The copper layer 31 is too thin, the risk of aluminum leakage is increased, the aluminum layer 32 of the first pole post structure 30 is at risk of corrosion, and the strength of the first pole post structure 30 and the overall sealing performance of the battery are affected. If the ratio of the minimum thickness a of the copper layer 31 included in the protruding section 37 to the height b of the step 35 is too large, since the positive pole post and the negative pole post are made of different materials, the conductivity of aluminum is poorer than that of copper. Therefore, the copper layer 31 is too thick, the strength can be ensured, but due to the difference in transmission rate between the positive pole post and the negative pole post, the resistance difference is large, which will result in a decrease in the rate and cycle performance of the battery, and the production cost of the first pole post structure 30 is increased. However, 0.025≤a / b≤1.33 can effectively reduce the risk of exposure of the aluminum layer 32 and effectively improve the use performance of the battery pack.

[0116] In one embodiment, the battery pack is a battery module or a battery pack.

[0117] The battery module includes a plurality of batteries, and the battery module can further include end plates and side plates for fixing the plurality of batteries.

[0118] It should be noted that the plurality of batteries can be arranged in the battery box after forming the battery module, and the plurality of batteries can be fixed by the end plates and the side plates. The plurality of batteries can be directly arranged in the battery box, i.e., the plurality of batteries do not need to be grouped, and in this case, the end plates and the side plates can be removed.

[0119] Other embodiments of the present disclosure will be apparent to those skilled in the art upon consideration of the specification and practice of the utility model creation disclosed herein. The present disclosure is intended to cover any variations, uses, or adaptations of the utility model that follow the general principles of the present disclosure and include common general knowledge or custom in the art not specifically disclosed. The specification and example embodiments are only considered as exemplary, and the true scope and spirit of the present disclosure are indicated by the appended claims.

[0120] It is to be understood that the present disclosure is not limited to the precise construction that has been described above and shown in the accompanying drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A battery case assembly characterized by, The application relates to a battery pole structure, which comprises: a battery shell (10) provided with a pole hole (11); a first pole structure (30) partially arranged in the pole hole (11), wherein the first pole structure (30) comprises a copper layer (31) and an aluminum layer (32) connected with each other; wherein the first pole structure (30) comprises a connecting section (33), a limiting section (34) and a protruding section (37), the limiting section (34) is connected to the circumferential outer surface of the connecting section (33), the normal projection of the limiting section (34) on the surface of the battery shell (10) provided with the pole hole (11) is arranged around the pole hole (11), the protruding section (37) is protruded from the connecting section (33), the limiting section (34) and the protruding section (37) are formed with a step (35), the protruding section (37) comprises at least part of the copper layer (31) and part of the aluminum layer (32), at least part of the copper layer (31) is located on the side of the protruding section (37) away from the connecting section (33) to cover the aluminum layer (32), the minimum thickness of the copper layer (31) included in the protruding section (37) is a along the direction X of the pole hole (11) penetrating through the battery shell (10), the limiting section (34) is overlapped on the battery shell (10), at least part of the protruding section (37) is arranged in the pole hole (11), the battery shell (10) is provided with a fixing part (12), at least part of the fixing part (12) is arranged around the pole hole (11), and the fixing part (12) fixes the first pole structure (30); wherein the fixing part (12) is bent into a fixing section (121) and a pressing section (122), the fixing section (121) is arranged on the battery shell (10), the pressing section (122) is arranged on the limiting section (34) to make at least part of the limiting section (34) clamped between the pressing section (122) and the battery shell (10), and the ratio of the minimum thickness c of the pressing section (122) to a is 0.2-10.

2. The battery case assembly of claim 1, wherein, The size of a is 0.1mm-2mm.

3. The battery case assembly of claim 1, wherein, The ratio of a to the Brinell hardness of the copper layer (31) is 0.0015mm-0.1mm.

4. The battery case assembly of claim 3, wherein, The ratio of the Brinell hardness of the copper layer (31) to the Brinell hardness of the aluminum layer (32) is 0.4-4.

5. The battery case assembly of claim 1, wherein, The minimum thickness of the aluminum layer (32) included in the protruding section (37) is d along the direction X of the pole hole (11) penetrating through the battery shell (10), and the ratio of a to d is 0.03-2.

6. The battery case assembly of claim 1, wherein, The side of the first pole structure (30) away from the protruding section (37) is formed with a groove (36); wherein the aluminum layer (32) forms at least part of the groove wall of the groove (36).

7. The battery case assembly of claim 6, wherein, The depth e of the groove (36) is 1.5mm-6mm along the direction X of the pole hole (11) penetrating through the battery shell (10).

8. The battery case assembly of claim 7, wherein, 0.15mm 2 ≤ a x e ≤ 12 mm 2 .

9. A battery, characterized by The battery shell assembly further comprises a second pole post structure (50) arranged on the battery shell (10), the electric core (20) comprises a first tab (21) and a second tab (22) with opposite polarities, the first tab (21) is electrically connected with the first pole post structure (30), the second tab (22) is electrically connected with the second pole post structure (50), the first pole post structure (30) is a negative output end, and the second pole post structure (50) is a positive output end.

10. The battery of claim 9, wherein, The second pole post structure (50) has an end surface area facing away from the electric core (20) which is greater than an end surface area of the first pole post structure (30) facing away from the electric core (20). ​

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