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

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery housing component and a battery. Background Art

[0002] In the related art, the battery may include a pole structure, and the negative pole structure may be formed by a copper-aluminum composite structure. However, due to the difference in material properties of the two materials, for example, the difference in ductility or hardness of the two materials, the copper layer in the formed pole structure may be too thin in some areas, resulting in a safety risk of aluminum leakage causing electrochemical corrosion of the pole assembly. Utility Model Content

[0003] The utility model provides a battery housing component and a battery, so as to improve the use performance of the battery housing component.

[0004] According to one aspect of the utility model, a battery housing assembly is provided, comprising:

[0005] A battery housing, wherein a terminal through hole is provided on the battery housing;

[0006] A first pole structure, a portion of which is disposed in the pole through hole, and the first pole structure includes a copper layer and an aluminum layer connected to each other;

[0007] Among them, 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 orthographic projection of the limiting section on the surface of the battery shell provided with a pole through hole is arranged around the pole through hole, the protruding section is protruding 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, and 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, along the direction X in which the pole through hole passes through the battery shell, the minimum thickness of the copper layer included in the protruding section is a, the height of the step is b, 0.025≤a / b≤1.33.

[0008] A battery shell assembly according to one embodiment of the utility model includes a battery shell and a first pole structure, and the first pole structure is arranged in the pole through hole of the battery shell. The copper layer of the first pole structure can be connected to the battery cell, and the aluminum layer can be used to connect to the bus. The limiting section of the first pole structure is connected to the circumferential outer surface of the connecting section, and the protruding section is protruded from the connecting section toward one side of the battery cell, so that the limiting section and the protruding section can form a step, and the protruding section includes at least part of the copper layer and part of the aluminum layer. Along the direction X in which the pole through hole passes through the battery shell, the minimum thickness of the copper layer included in the protruding section is a, and the height of the step is b. The ratio of the minimum thickness a of the copper layer included in the protruding section to the height b of the step is too small, and the copper layer is too thin, which increases the risk of aluminum leakage, resulting in the risk of corrosion of the aluminum layer of the first pole structure, affecting the strength of the first pole structure and the battery Overall sealing performance; the ratio of the minimum thickness a of the copper layer included in the protruding section to the height b of the step is too large. Since the positive electrode post and the negative electrode post are made of different materials, the conductivity of aluminum is worse than that of copper. Therefore, the copper layer is too thick. Although the strength can be guaranteed, due to the difference in transmission rates between the positive electrode post and the negative electrode post, the resistance difference is large, which will reduce the rate and cycle performance of the battery, and at the same time increase the production cost of the first electrode structure. 0.025≤a / b≤1.33 can effectively reduce the risk of exposure of the aluminum layer and can effectively improve the performance of the battery shell assembly.

[0009] According to another aspect of the utility model, a battery is provided, comprising the above-mentioned battery housing assembly and a battery cell, wherein the battery cell is arranged in the battery housing, the copper layer is electrically connected to the battery cell, and at least a portion of the copper layer is arranged on a side of the aluminum layer close to the battery cell.

[0010] A battery according to one embodiment of the utility model includes a battery case, a battery cell and a first pole structure. The battery cell is arranged in the battery case, and the first pole structure is arranged in the pole through hole of the battery case, and the battery cell is electrically connected to the first pole structure. The copper layer of the first pole structure can be connected to the battery cell, and the aluminum layer can be used to connect to the bus. The limiting section of the first pole structure is connected to the circumferential outer surface of the connecting section, and the protruding section is protruded from the connecting section toward one side of the battery cell, so that the limiting section and the protruding section can form a step, and the protruding section includes at least part of the copper layer and part of the aluminum layer. Along the direction X in which the pole through hole passes through the battery case, the minimum thickness of the copper layer included in the protruding section is a, and the height of the step is b. The ratio of the minimum thickness a of the copper layer included in the protruding section to the height b of the step is too small, and the copper layer is too thin, which increases the risk of aluminum leakage, resulting in the risk of corrosion of the aluminum layer of the first pole structure, affecting the strength and The overall sealing performance of the battery; the ratio of the minimum thickness a of the copper layer included in the protruding section to the height b of the step is too large. Since the positive electrode post and the negative electrode post are made of different materials, the conductivity of aluminum is worse than that of copper. Therefore, the copper layer is too thick. Although the strength can be guaranteed, due to the difference in transmission rates between the positive electrode post and the negative electrode post, the resistance difference is large, the rate and cycle performance of the battery will be reduced, and the production cost of the first electrode structure will be increased. 0.025≤a / b≤1.33 can effectively reduce the risk of exposure of the aluminum layer and effectively improve the performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to better understand the present disclosure, reference may be made to the embodiments shown in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, related elements or components may have different arrangements as known in the art. In addition, in the drawings, the same reference numerals represent the same or similar components in each drawing. Among them:

[0012] Figure 1 is a schematic structural diagram of a battery according to an exemplary embodiment;

[0013] Figure 2 is a schematic diagram of a partial cross-sectional structure of a battery according to an exemplary embodiment;

[0014] Figure 3 is a schematic diagram of a partial cross-sectional structure of a battery according to another exemplary embodiment;

[0015] Figure 4 is a schematic cross-sectional structure diagram of a first pole structure of a battery according to an exemplary embodiment;

[0016] Figure 5is a schematic cross-sectional structure diagram of a battery according to another exemplary embodiment;

[0017] Figure 6 is a schematic structural diagram of a battery cell according to an exemplary embodiment;

[0018] Figure 7 is a schematic structural diagram of a battery cell according to another exemplary embodiment.

[0019] The following are the descriptions of the reference numerals:

[0020] 10. Battery shell; 11. Pole through hole; 12. Fixing part; 121. Fixing section; 122. Pressing section; 13. Cover plate; 14. Shell member; 20. Battery cell; 21. First pole ear; 22. Second pole ear; 30. First pole structure; 31. Copper layer; 32. Aluminum layer; 33. Connecting section; 34. Limiting section; 35. Step; 351. Corner area; 36. Groove; 37. Protruding section; 38. Blocking member; 40. Sealing member; 41. Insulating member; 50. Second pole structure; 60. Adapter. DETAILED DESCRIPTION

[0021] The following will be combined with the accompanying drawings in the exemplary embodiments of the present disclosure to clearly and completely describe the technical solutions in the exemplary embodiments of the present disclosure. The exemplary embodiments described herein are only for illustrative purposes and are not intended to limit the scope of protection of the present disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of the present disclosure.

[0022] In the description of the present disclosure, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more; the term "and / or" includes any and all combinations of one or more associated listed items. In particular, reference to "the / the" object or "an" object is also intended to indicate one of a possible plurality of such objects.

[0023] Unless otherwise specified or explained, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

[0024] Further, in the description of the present disclosure, it should be understood that the directional words such as "upper", "lower", "inner", "outer" and the like described in the exemplary embodiments of the present disclosure are described at the angles shown in the accompanying drawings and should not be understood as limitations on the exemplary embodiments of the present disclosure. It should also be understood that, in the context, when it is mentioned that an element or feature is connected to another element (one or more) "upper", "lower", or "inner", "outer", it can not only be directly connected to the other (one or more) elements "upper", "lower", "inner", "outer", but also can be indirectly connected to the other (one or more) elements "upper", "lower", "inner", "outer" through an intermediate element.

[0025] An embodiment of the present utility model provides a battery, please refer to Figures 1 to 7 The battery comprises: a battery housing 10, on which a pole through hole 11 is provided; a first pole structure 30, a portion of which is inserted into the pole through hole 11, and the first pole structure 30 comprises a copper layer 31 and an aluminum layer 32 connected to each other; wherein the first pole structure 30 comprises a connecting section 33, a limiting section 34 and a protruding section 37, wherein the limiting section 34 is connected to the circumferential outer surface of the connecting section 33, and the orthographic projection of the limiting section 34 on the surface of the battery housing 10 on which the pole through hole 11 is provided surrounds the pole. The column through hole 11 is provided, and the protruding section 37 is protruded from the connecting section 33. The limiting section 34 and the protruding section 37 form a step 35. The protruding section 37 includes at least a portion of the copper layer 31 and a portion of the aluminum layer 32, and at least a portion 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. In the direction X along which the pole through hole 11 passes through the battery housing 10, the minimum thickness of the copper layer 31 included in the protruding section 37 is a, and the height of the step 35 is b, 0.025≤a / b≤1.33.

[0026] The battery housing assembly of one embodiment of the utility model includes a battery housing 10 and a first pole structure 30, and the first pole structure 30 is arranged in the pole through hole 11 of the battery housing 10. The copper layer 31 of the first pole structure 30 can be used to connect with the battery cell, and the aluminum layer 32 can be used to connect with the busbar. The limiting section 34 of the first pole structure 30 is connected to the circumferential outer surface of the connecting section 33, and the protruding section 37 is protruding from the connecting section 33, so that the limiting section 34 and the protruding section 37 can form a step 35, and 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 through hole 11 passes through the battery shell 10, the minimum thickness of the copper layer 31 included in the protruding section 37 is a, and 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 to the height b of the step 35 is too small, and the copper layer 31 is too thin, which increases the risk of aluminum leakage, resulting in the risk of corrosion of the aluminum layer 32 of the first pole structure 30, affecting 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 protruding section 37 to the height b of the step 35 is too large. Since the positive pole and the negative pole are made of different materials, the conductivity of aluminum is worse than that of copper. Therefore, the copper layer 31 is too thick. Although the strength can be guaranteed, due to the difference in transmission rate between the positive pole and the negative pole, the resistance difference is large, the rate and cycle performance of the battery will be reduced, and the production cost of the first pole structure 30 will be increased. 0.025≤a / b≤1.33 can effectively reduce the risk of exposure of the aluminum layer 32 and can effectively improve the performance of the battery shell assembly.

[0027] It should be noted that, combined with Figure 2 As shown, a pole through hole 11 is provided on the battery housing 10 , and the first pole structure 30 is passed through the pole through hole 11 , so that the first pole structure 30 is fixed on the battery housing 10 .

[0028] like Figures 2 to 5 As shown, the first pole structure 30 includes a copper layer 31 and an aluminum layer 32 connected to each other, and the copper layer 31 and the aluminum layer 32 can respectively connect the battery cell 20 and the busbar. For example, the copper layer 31 can be connected to the copper tab of the battery cell 20, and the aluminum layer 32 can be connected to the aluminum busbar, thereby achieving electrical connection of at least two batteries. The copper layer 31 can include pure copper or a copper alloy, and the aluminum layer 32 can include pure aluminum or an aluminum alloy, such as an aluminum-manganese alloy, an aluminum-magnesium alloy, etc.

[0029] Combination 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 from the circumferential outer surface of the connecting section 33, and the protruding section 37 is protruded from the connecting section 33 toward the side of 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 surface of the limiting section 34 facing the battery cell 20 and the circumferential outer surface of the protruding section 37 form a step 35. Figure 4 As shown, the portion above the dotted line can be considered as the connecting segment 33 and the limiting segment 34 , while the portion below the dotted line can be considered as the protruding segment 37 , which includes a portion of the copper layer 31 and a portion of the aluminum layer 32 .

[0030] The limiting section 34 is projected on the surface of the battery housing 10 where the pole through hole 11 is provided, and is arranged around the pole through hole 11, so that the limiting section 34 can be fixed on the battery housing 10 in a limited manner. The setting of the protruding section 37 can conveniently form an electrical connection between the battery cell 20 and the first pole structure 30. The connecting section 33 can ensure the current carrying 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 an electrical connection with other batteries through a bus.

[0031] The protruding section 37 includes at least a portion of the copper layer 31 and a portion of the aluminum layer 32, and at least a portion 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, thereby allowing the copper layer 31 to form a protection for the aluminum layer 32, and the copper layer 31 can be arranged to cover the aluminum layer 32.

[0032] like Figure 2 As shown, along the direction X in which the pole through hole 11 passes through the battery housing 10, the minimum thickness of the copper layer 31 included in the protruding section 37 can be expressed as a, and the height of the step 35 can be expressed as b. 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, etc.

[0033] In one embodiment, Figure 2As shown, the limiting section 34 is overlapped on the battery housing 10, and at least a portion of the protruding section 37 is inserted into the pole through hole 11, which not only facilitates the arrangement of the first pole structure 30 so that the limiting section 34 forms a limiting connection with the battery housing 10, but also facilitates the protruding section 37 to form an electrical connection with the battery cell 20, and can shorten the connection distance between the protruding section 37 and the battery cell 20 to a certain extent.

[0034] The limiting section 34 overlaps the side of the battery housing 10 away from the battery cell 20 , that is, a portion of the first pole structure 30 can be located outside the battery housing 10 , thereby forming a limiting fixation with the battery housing 10 , thereby improving the fixing ability of the first pole structure 30 .

[0035] In one embodiment, a fixing portion 12 is provided on the battery housing 10, and at least a portion of the fixing portion 12 is arranged around the pole through hole 11. The fixing portion 12 fixes the first pole structure 30, thereby ensuring that the first pole structure 30 can be stably arranged on the battery housing 10, thereby improving the safe use performance of the battery.

[0036] The fixing portion 12 may be connected to the first pole structure 30 by riveting, or the fixing portion 12 may be interference fit with the first pole structure 30 , or the fixing portion 12 may be threadedly connected to the first pole structure 30 .

[0037] In one embodiment, Figure 2 and Figure 5 As shown, 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 housing 10, and the pressing section 122 is pressed on the limiting section 34, so that at least a portion of the limiting section 34 is clamped between the pressing section 122 and the battery housing 10, thereby ensuring the connection stability of the first pole structure 30, preventing the first pole structure 30 from detaching from the battery housing 10, and effectively improving the safe use performance of the battery.

[0038] Combination Figure 5 As shown, the battery housing 10 is provided with a fixing portion 12, which can be welded and fixed to the battery housing 10, or the fixing portion 12 can be integrally formed on the battery housing 10. At least part of the fixing portion 12 is arranged around the pole through hole 11, thereby facilitating the fixing portion 12 to fix the first pole structure 30, thereby improving the assembly efficiency of the battery.

[0039] The fixing portion 12 can be bent into a fixing section 121 and a pressing section 122, so that the pressing section 122 can be pressed onto the first pole structure 30, and the first pole structure 30 is clamped between the pressing section 122 and the battery housing 10. At this time, a certain angle is formed between the fixing section 121 and the pressing section 122, so that the fixing section 121 can be set on the battery housing 10, and the pressing section 122 can be pressed onto the first pole structure 30, thereby effectively preventing the first pole structure 30 from detaching from the battery housing 10, thereby ensuring the safe use performance of the battery.

[0040] The first pole structure 30 is passed through the pole through hole 11, thereby setting the first pole structure 30 on the battery housing 10, and the first pole structure 30 and the battery housing 10 can be insulated. For example, the first pole structure 30 and the battery housing 10 can be insulated by an insulating structure, or the first pole structure 30 and the battery housing 10 can be insulated by an insulating coating.

[0041] 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 of the copper layer 31 easily leaking the aluminum layer 32, it can also ensure that the pressing section 122 can effectively fix and limit the first pole structure 30, thereby improving the safe use performance of the battery.

[0042] Combination Figure 5 As shown, the minimum thickness of the pressing section 122 can be expressed 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 fixing 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, resulting in an increased risk of corrosion, which is not conducive to ensuring the service life of the battery.

[0043] 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, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3.0, 3.1, 3.2, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.1 .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.

[0044] In one embodiment, Figure 5 As shown, the battery housing assembly also includes a seal 40, at least a portion of which is disposed between the first pole structure 30 and the battery housing 10, thereby forming a sealed protection between the first pole structure 30 and the battery housing 10, and preventing the inside and outside of the battery housing 10 from being connected through the pole through hole 11.

[0045] Among them, at least part of the seal 40 is arranged between the step 35 and the battery shell 10, the step 35 has a corner area 351, at least part of the corner area 351 is in contact with the seal 40, and the R angle of the corner area 351 is 0.12mm-1.48mm, which not only facilitates the molding of the corner area 351, but also ensures that the seal 40 forms a reliable seal with the first pole structure 30 and the battery shell 10, avoiding battery safety risks.

[0046] Combination Figure 5 As shown, the corner area 351 can be in contact with the seal 40, and the corner area 351 of the step 35 can be considered as a transition area between the end face of the limiting section 34 facing the battery cell 20 and the circumferential outer surface of the protruding section 37, and the R angle of the corner area 351 can be considered to be cut along the center line direction of the first pole structure 30, so as to form an arc line between the outer edge of the limiting section 34 and the outer edge of the protruding section 37, and the radius of the arc line is the R angle size of the corner area 351.

[0047] The R angle of the corner area 351 can be 0.12mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm or 1.48mm, etc. If the R angle of the corner area 351 is too large, it may affect the seal between the first pole structure 30 and the battery housing 10, which may easily cause battery safety risks; and if the R angle of the corner area 351 is too small, it is not only not conducive to structural molding, but may also cause stress concentration, and may damage the seal 40, which is not conducive to sealing protection.

[0048] The first pole structure 30 is radially cut along the direction X in which the pole through hole 11 passes through the battery housing 10, and the cross-section of the cut first pole structure 30 is placed under an image measuring instrument. The radius measuring function of the image measuring instrument is used to take points at the R angle of the corner area 351 (3-5 measurement points can be taken), thereby obtaining the size of the R angle of the corner area 351.

[0049] In one embodiment, the ratio of the initial thickness of the seal 40 to the R angle of the corner area 351 is 0.6-15, which can not only effectively control the sealing performance of the seal 40 between the first pole structure 30 and the battery casing 10 to ensure the safe use of the battery, but also reduce the risk of leakage of the aluminum layer 32 in the corner area 351.

[0050] The initial thickness of the seal 40 can be considered as the thickness dimension obtained after the seal 40 is removed from the battery and the seal 40 is out of the compressed state. The aging problem caused by the long-term use of the seal 40 is not considered here.

[0051] The ratio of the initial thickness of the seal 40 to the R angle of the corner area 351 is too small, the seal between the first pole structure 30 and the battery case 10 is weak, the electrolyte flows out to the aluminum layer 32, causing corrosion of the first pole structure 30, affecting the performance of the battery; the ratio of the initial thickness of the seal 40 to the R angle of the corner area 351 is too large, the corner area 351 is prone to aluminum leakage risk, and there may be a safety risk of electrochemical corrosion.

[0052] The ratio of the initial thickness of the seal 40 to the R angle of the corner area 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, etc.

[0053] In one embodiment, Figure 5 As shown, an insulating member 41 may be disposed between the battery housing 10 and the first pole structure 30 .

[0054] In one embodiment, the minimum thickness of the copper layer 31 included in the protruding section 37 is a, and the size of a is 0.1mm-2mm. On the basis of reducing the risk of aluminum leakage, it can also be beneficial to balance the current transmission rate of the positive electrode column and the negative electrode column.

[0055] The minimum thickness a of the copper layer 31 included in the protruding section 37 is too small, resulting in the protruding section 37 being too thin at the corner area 351 of the step 35 during the molding process, thereby increasing the risk of local aluminum leakage and the risk of corrosion of the first pole structure 30. The minimum thickness a of the copper layer 31 included in the protruding section 37 is too large, resulting in a large difference in the current transmission rate between the positive pole and the negative pole, which is not conducive to the operation of the battery.

[0056] The minimum thickness a of the copper layer 31 included in the protruding segment 37 can be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm or 2mm, etc.

[0057] In one embodiment, the height of the step 35 is b, and the size of b is 1.52 mm-3.9 mm, which not only facilitates the electrical connection between the copper layer 31 and the battery cell 20, but also reduces the risk of aluminum leakage, thereby ensuring the safe use performance of the battery.

[0058] The height b of the step 35 is too large, and the protruding height of the protruding section 37 is relatively large. During the thinning process of the copper layer 31 during the molding process, the local copper layer 31 is too thin and the aluminum layer 32 leaks out, causing corrosion of the first pole structure 30; 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.

[0059] The height b of the step 35 can be 1.52mm, 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, 3.85mm or 3.9mm, etc.

[0060] In one embodiment, the step 35 has a corner area 351, and the ratio of the R angle of the corner area 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.

[0061] The ratio of the R angle of the corner area 351 to a is too small, and the corner area 351 is not easy to push the material, and there may be a risk of corrosion due to local thinness. Moreover, since the positive pole and the negative pole are made of different materials, the conductivity of aluminum is worse than that of copper. Therefore, the copper layer 31 is too thick. Although the strength can be guaranteed, 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. The ratio of the R angle of the corner area 351 to a is too large, and the copper layer 31 is too thin, so the copper layer 31 is prone to aluminum leakage, causing corrosion risks. Since the R angle of the corner area 351 is set too large, the subsequent sealing performance of the first pole structure 30 is affected.

[0062] The ratio of the R angle size of the corner area 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 so on.

[0063] In one embodiment, the R angle of the corner area 351 is 0.1mm-1.5mm, which not only facilitates the molding of the corner area 351 and reduces the risk of aluminum leakage, but also ensures that the first pole structure 30 and the battery shell 10 are easily sealed to avoid battery safety risks.

[0064] In one embodiment, the ratio of a to the Brinell hardness of the copper layer 31 is 0.0015mm-0.1mm, 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, and aluminum leakage is likely to occur in the corner area 351. The Brinell hardness of the copper layer 31 is too large and it is not easy to push the material, resulting in local uneven material. 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, and the conductivity of aluminum is worse than that of copper. Therefore, the copper layer 31 is too thick. Although the strength can be guaranteed, due to the difference in transmission rates between the positive electrode column and the negative electrode column, the resistance difference is large, which will result in a reduction in the rate and cycle performance of the battery, and will increase the overall manufacturing cost of the first electrode structure 30.

[0065] 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 0.0015mm, 0.002mm, 0.003mm, 0.004mm, 0.005mm, 0.006mm, 0.007mm, 0.008mm, 0.01mm, 0.02mm, 0.03mm, 0.04mm, 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm or 0.1mm, etc.

[0066] 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 can not only ensure the overall structural strength of the first pole structure 30 but also reduce the risk of aluminum leakage, thereby effectively improving the safe use performance of the first pole structure 30.

[0067] The ratio of the Brinell hardness of the copper layer 31 to the Brinell hardness of the aluminum layer 32 is too small. After the internal battery cell 20 collides with the first pole structure 30, the first pole structure 30 is relatively weak, which will affect the overall structural strength; 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 aluminum leakage in the corner area 351 and the risk of corrosion.

[0068] 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, etc.

[0069] In one embodiment, along the direction X in which the pole through hole 11 passes through the battery casing 10, in the area 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 is 0.5-80, which can reduce the risk of aluminum leakage and control the consistency of the transmission rate of the positive pole and the negative pole.

[0070] Combination Figure 4 As shown, along the direction X in which the pole through hole 11 passes through the battery housing 10, in the area where the connecting section 33 and the protruding section 37 are located, the minimum thickness of the aluminum layer 32 can be represented as a1, and the minimum thickness of the copper layer 31 can be represented as a.

[0071] Combination Figure 5 As shown, along the direction X in which the terminal through hole 11 passes through the battery housing 10, in the area where the connecting section 33 and the protruding section 37 are located, the minimum thickness of the aluminum layer 32 can be represented as d, and the minimum thickness of the copper layer 31 can be represented as a.

[0072] In the area 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 is too large, and there is a risk of corrosion of the first pole structure 30 due to aluminum leakage from the copper layer 31; the ratio of the minimum thickness of the aluminum layer 32 to the minimum thickness of the copper layer 31 is too small, and the resistance transmission rates of the positive and negative poles of the battery are inconsistent.

[0073] In the area 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, etc.

[0074] In one embodiment, along the direction X in which the electrode through hole 11 passes through the battery casing 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 large difference in electron transfer rate between the positive electrode and the negative electrode can be avoided.

[0075] Combination Figure 4 and Figure 5 As shown, along the direction X in which the pole through hole 11 passes through the battery casing 10, the minimum thickness of the aluminum layer 32 included in the protruding section 37 can be expressed 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, etc.

[0076] In one embodiment, the copper layer 31 and the aluminum layer 32 are integrally formed, 0.03≤a / b, which not only facilitates the rapid forming of the copper layer 31 and the aluminum layer 32, but also increases the risk of aluminum leakage at the corners of the integral forming of the copper layer 31 and the aluminum layer 32, and the ductility of aluminum is better. The flow rate of the material strip during the forming process of the two is quite different. 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.

[0077] The copper layer 31 and the aluminum layer 32 are integrally formed, which means that after the materials of the two are prepared, they are formed by a common forming method, which is called an integrally formed setting.

[0078] For example, the first pole structure 30 is formed by cold heading or extrusion, which can not only reduce the overall internal resistance of the first pole structure 30 , but also improve the overall manufacturing efficiency of the first pole structure 30 and reduce the cost of the first pole structure 30 .

[0079] Cold heading or extrusion can be considered as deforming the aluminum material and the copper material and then squeezing them together, thereby forming the first pole structure 30 in which the aluminum layer 32 and the copper layer 31 are connected. When the first pole structure 30 is formed by cold heading or extrusion, in the process of forming the step 35, the copper layer 31 in the corner area 351 can be controlled to be difficult to push the material, thereby ensuring the uniform distribution of the material to the greatest extent, thereby reducing the risk of corrosion caused by local excessive thinness.

[0080] In one embodiment, a groove 36 is formed on the side of the first pole structure 30 away from the protruding section 37; wherein the aluminum layer 32 forms at least a portion of the groove wall of the groove 36, which not only facilitates the molding of the protruding section 37 and increases the overall thickness of the protruding section 37, but also prevents the copper layer 31 from being too thin and leaking aluminum, thereby improving the safe use performance of the battery.

[0081] A groove 36 is formed on a side of the first pole structure 30 away from the protruding section 37 , that is, a groove 36 is formed on a side of the first pole structure 30 away from the battery cell 20 .

[0082] In one embodiment, along the direction X in which the pole through hole 11 passes through the battery housing 10, the depth e of the groove 36 is 1.5 mm-6 mm, which can reduce the risk of aluminum leakage due to the copper layer 31 being too thin, and can effectively control the height dimension of the first pole structure 30, thereby controlling the space occupancy rate of the first pole structure 30 of the battery.

[0083] Combination Figure 5 As shown, along the direction X in which the pole through hole 11 passes through the battery shell 10, the depth of the groove 36 can be expressed as e. If the depth e of the groove 36 is too small, the copper layer 31 is prone to be locally too thin, and there may be a 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 larger space of the entire battery, and the overall space utilization rate of the battery is low.

[0084] 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.

[0085] In one embodiment, 0.15 mm 2 ≤a×e≤12mm 2 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, and more material is needed to ensure the thickness during the molding process of the protruding section 37, resulting in a small overall thickness in the protruding section 37, and the copper layer 31 is locally too thin, and the risk of aluminum leakage is increased; 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, and the first pole structure 30 occupies a larger space inside the battery.

[0086] 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 0.15 mm. 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 etc.

[0087] In one embodiment, Figure 5As shown, a blocking member 38 may be disposed in the groove 36 , and the blocking member 38 is connected to the aluminum layer 32 . The blocking member 38 may be used to connect to the busbar.

[0088] In one embodiment, the step 35 has a corner area 351, the copper layer 31 forms at least a portion of the corner area 351, and the copper layer 31 has a minimum thickness of ≥0.01 mm in the corner area 351, thereby effectively reducing the risk of aluminum leakage from the copper layer 31 in the corner area 351, thereby improving the safe use performance of the first pole structure 30.

[0089] The minimum thickness of the copper layer 31 in the corner area 351 may 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.

[0090] In one embodiment, along the direction Y perpendicular to the pole through hole 11 passing through the battery housing 10, the width f of the step 35 is 1.5 mm-5 mm. The smaller the width f of the step 35, the greater the risk of aluminum leakage from the protruding section 37; the larger the width f of the step 35, the smaller the flow area on the bottom surface of the first pole structure 30, the more serious the local heat generation, and the increase in internal resistance.

[0091] Combination Figure 2 As shown, along the direction Y perpendicular to the pole through hole 11 passing through the battery housing 10, the width of the step 35 can be expressed as f, and the width f of the step 35 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 or 5mm, etc.

[0092] In one embodiment, part of the aluminum layer 32 is located within the copper layer 31, and the connection area between the aluminum layer 32 and the copper layer 31 includes a curved surface, and a / b≤1.25, thereby ensuring the connection strength between the aluminum layer 32 and the copper layer 31, avoiding detachment of the interface between the aluminum layer 32 and the copper layer 31, causing the aluminum layer 32 to be affected, thereby improving the safe use performance of the first pole structure 30.

[0093] Combination Figures 2 to 5 As shown, the corner connection area between the aluminum layer 32 and the copper layer 31 can be a curved surface, thereby ensuring the connection strength between the aluminum layer 32 and the copper layer 31 .

[0094] An embodiment of the utility model further provides a battery, which includes the above-mentioned battery shell assembly and a battery cell 20, wherein the battery cell 20 is arranged in the battery shell 10, the copper layer 31 is electrically connected to the battery cell 20, and at least a portion of the copper layer 31 is arranged on a side of the aluminum layer 32 close to the battery cell 20.

[0095] A battery according to an embodiment of the present invention includes a battery housing 10, a battery cell 20, and a first pole structure 30. The battery cell 20 is disposed in the battery housing 10, and the first pole structure 30 is disposed in the pole through hole 11 of the battery housing 10. The battery cell 20 is electrically connected to the first pole structure 30. The copper layer 31 of the first pole structure 30 can be connected to the battery cell 20, and the aluminum layer 32 can be used to connect to the busbar. The limiting section 34 of the first pole structure 30 is connected to the circumferential outer surface of the connecting section 33, and the protruding section 37 is protruded from the connecting section 33 toward one side of the battery cell 20, so that the limiting section 34 and the protruding section 37 can form a step 35, and 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 through hole 11 passes through the battery shell 10, the minimum thickness of the copper layer 31 included in the protruding section 37 is a, and 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 to the height b of the step 35 is too small, and the copper layer 31 is too thin, which increases the risk of aluminum leakage, resulting in corrosion of the aluminum layer 32 of the first pole structure 30. The risk of the first pole structure 30 being damaged and the overall sealing performance of the battery being affected is affected; 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 and the negative pole are made of different materials, the conductivity of aluminum is worse than that of copper. Therefore, the copper layer 31 is too thick. Although the strength can be guaranteed, the resistance difference is large due to the difference in transmission rates between the positive pole and the negative pole, which will reduce the rate and cycle performance of the battery and increase the production cost of the first pole structure 30. 0.025≤a / b≤1.33 can effectively reduce the risk of exposure of the aluminum layer 32 and effectively improve the performance of the battery.

[0096] In one embodiment, Figure 1As shown, the battery shell assembly also includes a second pole structure 50, which is arranged on the battery shell 10, and the battery cell 20 includes a first pole ear 21 and a second pole ear 22 with opposite polarities, the first pole ear 21 is electrically connected to the first pole structure 30, and the second pole ear 22 is electrically connected to 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 end face area of ​​the second pole structure 50 away from the battery cell 20 is larger than the end face area of ​​the first pole structure 30 away from the battery cell 20, which can not only increase the flow area of ​​the second pole structure 50, but also balance the current transmission rates of the first pole structure 30 and the second pole structure 50, and reduce the overall internal resistance of the battery, thereby avoiding inconsistent current transmission rates of the pole pieces of the battery cell 20 and causing local lithium deposition.

[0097] 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.

[0098] like Figure 6 As shown, the first pole tab 21 and the second pole tab 22 may extend from the same end of the battery cell 20, or, as shown in Figure 7 As shown, the first electrode tab 21 and the second electrode tab 22 may extend from opposite ends of the battery cell 20 .

[0099] The first pole tab 21 and the second pole tab 22 may be directly connected to the first pole structure 30 and the second pole structure 50 respectively; or, the first pole tab 21 and the second pole tab 22 may be directly connected to the first pole structure 30 and the second pole structure 50 respectively through two adapter sheets.

[0100] For example, Figure 2 As shown, the first pole lug 21 can be directly connected to the first pole structure 30. Alternatively, Figure 3 As shown, the first pole tab 21 can be connected to the first pole structure 30 via an adapter sheet 60 .

[0101] In one embodiment, the battery cell 20 includes a first pole ear 21, which is directly in contact with the copper layer 31. The first pole ear 21 includes copper, and 0.028≤a / b. This ensures that the copper layer 31 has a certain thickness, thereby ensuring the structural strength of the first pole structure 30, thereby ensuring the safe use performance of the battery.

[0102] After the first pole ear 21 is directly in contact with the copper layer 31, the connection strength between the first pole ear 21 and the first pole column structure 30 needs to be guaranteed. Therefore, in addition to avoiding aluminum leakage and a small difference in positive and negative currents, it is also necessary to take into account the overall strength of the first pole ear 21 and the first pole column structure 30 to avoid too high a proportion of the aluminum layer 32, which leads to weak strength of the first pole column structure 30 and causes 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.

[0103] The first pole tab 21 includes copper, and the first pole tab 21 directly contacts and connects the copper layer 31 , thereby ensuring the connection strength between the first pole tab 21 and the copper layer 31 and facilitating the connection therebetween, for example, the first pole tab 21 and the copper layer 31 are connected by welding.

[0104] In one embodiment, Figure 1 As shown, the battery housing 10 may include a cover plate 13 and a housing member 14 , the cover plate 13 and the housing member 14 are connected, and the cover plate 13 may be provided with a first pole structure 30 and a second pole structure 50 .

[0105] In some embodiments, the battery housing 10 may include a cover plate 13 and a housing member 14 , the cover plate 13 and the housing member 14 are connected, and a first pole structure 30 and a second pole structure 50 may be provided on a side of the housing member 14 opposite to the cover plate 13 .

[0106] In some embodiments, the battery housing 10 may include a cover plate 13 and a housing member 14, the cover plate 13 and the housing member 14 are connected, there may be two cover plates 13, the two cover plates 13 may be arranged opposite to each other, and the first pole structure 30 and the second pole structure 50 may be arranged on the two cover plates 13 respectively.

[0107] It should be noted that the battery housing assembly may be a cover plate assembly, for example, the battery housing 10 may include a cover plate 13, and the battery housing 10 does not include a housing member 14; or, the battery housing assembly may be a cover plate assembly, for example, the battery housing 10 may include a housing member 14, and the battery housing 10 does not include a cover plate 13.

[0108] It should be noted that the battery includes a cell and an electrolyte, which is the smallest unit capable of performing electrochemical reactions such as charge / discharge. A cell refers to a unit formed by winding or laminating a stacked portion, the stacked portion including a first pole sheet, a separator, and a second pole sheet. When the first pole sheet is a positive pole sheet, the second pole sheet is a negative pole sheet. The polarities of the first pole sheet and the second pole sheet can be interchanged. The first pole sheet and the second pole sheet are coated with an active material.

[0109] In one embodiment, the battery may be a quadrangular prism battery. A quadrangular prism battery mainly refers to a battery having a prism shape, but it is not strictly limited whether each side of the prism must be a straight line in the strict sense, and the corners between the sides are not necessarily right angles, and can be arc transitions.

[0110] The battery can be a laminated battery, which is not only convenient to group, but also can be processed to obtain a longer battery. Specifically, the battery cell is a laminated battery cell, which has a first pole piece stacked on top of each other, a second pole piece with electrical properties opposite to the first pole piece, and a diaphragm sheet arranged between the first pole piece and the second pole piece, so that multiple pairs of first pole pieces and second pole pieces are stacked to form a laminated battery cell.

[0111] Alternatively, the battery may be a wound battery, that is, a first pole sheet, a second pole sheet with electrical properties opposite to the first pole sheet, and a diaphragm sheet arranged between the first pole sheet and the second pole sheet are wound to obtain a wound battery cell.

[0112] In one embodiment, the battery may be a cylindrical battery, or the battery may be a hexagonal prism battery. The battery may be a wound battery, that is, a first pole piece, a second pole piece with electrical properties opposite to the first pole piece, and a diaphragm sheet disposed between the first pole piece and the second pole piece are wound to obtain a wound battery cell.

[0113] An embodiment of the utility model further provides a battery pack, which includes the above-mentioned battery.

[0114] The battery of the battery pack of one embodiment of the utility model comprises a battery housing 10, a battery cell 20 and a first pole structure 30, wherein the battery cell 20 is disposed in the battery housing 10, the first pole structure 30 is disposed in the pole through hole 11 of the battery housing 10, and the battery cell 20 is electrically connected to the first pole structure 30. The copper layer 31 of the first pole structure 30 can be connected to the battery cell, and the aluminum layer 32 can be used to connect to the busbar. The limiting section 34 of the first pole structure 30 is connected to the circumferential outer surface of the connecting section 33, and the protruding section 37 is protruded from the connecting section 33 toward one side of the battery cell 20, so that the limiting section 34 and the protruding section 37 can form a step 35, and 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 through hole 11 passes through the battery shell 10, the minimum thickness of the copper layer 31 included in the protruding section 37 is a, and 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 to the height b of the step 35 is too small, and the copper layer 31 is too thin, which increases the risk of aluminum leakage, resulting in corrosion of the aluminum layer 32 of the first pole structure 30. The risk of the first pole structure 30 being damaged and the overall sealing performance of the battery being affected is affected; 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 and the negative pole are made of different materials, the conductivity of aluminum is worse than that of copper. Therefore, the copper layer 31 is too thick. Although the strength can be guaranteed, due to the difference in transmission rates 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. 0.025≤a / b≤1.33 can effectively reduce the risk of exposure of the aluminum layer 32 and can effectively improve the performance of the battery pack.

[0115] In one embodiment, the battery pack is a battery module or a battery pack.

[0116] The battery module includes a plurality of batteries, and the battery module may further include an end plate and a side plate, and the end plate and the side plate are used to fix the plurality of batteries.

[0117] It should be noted that multiple batteries can be arranged in a battery box after forming a battery module, and multiple batteries can be fixed by end plates and side plates. Multiple batteries can be directly arranged in the battery box, that is, there is no need to group multiple batteries, in which case the end plates and side plates can be removed.

[0118] Those skilled in the art will readily come up with other embodiments of the present disclosure after considering the specification and practicing the utility model disclosed herein. The present disclosure is intended to cover any variation, use or adaptation of the present utility model, which follows the general principles of the present disclosure and includes common knowledge or customary technical means in the art that are not disclosed in the present disclosure. The specification and example embodiments are to be regarded as exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

[0119] It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from its scope. The scope of protection of the present disclosure is limited only by the appended claims.

Claims

1. A battery housing assembly, characterized in that: include: A battery housing (10), wherein a terminal through hole (11) is provided on the battery housing (10); A first pole structure (30), a portion of which is inserted into the pole through hole (11), and the first pole structure (30) comprises a copper layer (31) and an aluminum layer (32) connected to each other; 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); and the orthographic projection of the limiting section (34) on the surface of the battery housing (10) on which the pole through hole (11) is provided is arranged around the pole through hole (11); the protruding section (37) is arranged to protrude from the connecting section (33); and the limiting section (34) and the protruding section (37) form a step (37). 5), 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 a side of the protruding section (37) away from the connecting section (33) to cover the aluminum layer (32), and along the direction X in which the electrode through hole (11) passes through the battery housing (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 0.025≤a / b≤1.

33.

2. The battery housing assembly according to claim 1, characterized in that: The limiting section (34) is overlapped on the battery housing (10), and at least a portion of the protruding section (37) is inserted into the pole through hole (11).

3. The battery housing assembly according to claim 2, characterized in that: The battery housing (10) is provided with a fixing portion (12), at least part of which is arranged around the pole through hole (11), and the fixing portion (12) fixes the first pole structure (30); wherein the fixing portion (12) is bent into a fixing section (121) and a pressing section (122), the fixing section (121) being arranged on the battery housing (10), and the pressing section (122) being pressed 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 housing (10).

4. The battery housing assembly according to claim 3, characterized in that: The ratio of the minimum thickness c of the pressing section (122) to a is 0.2-10.

5. The battery housing assembly according to claim 2, characterized in that: The battery housing assembly further comprises a sealing member (40), at least a portion of which is disposed between the first pole structure (30) and the battery housing (10); Wherein, at least a portion of the sealing member (40) is disposed between the step (35) and the battery housing (10), the step (35) has a corner region (351), at least a portion of the corner region (351) is in contact with the sealing member (40), and the R angle of the corner region (351) is 0.12 mm-1.48 mm.

6. The battery housing assembly according to claim 5, characterized in that: The ratio of the initial thickness of the sealing member (40) to the R angle of the corner area (351) is 0.6-15.

7. The battery housing assembly according to claim 1, characterized in that: The size of a is 0.1mm-2mm, and / or the size of b is 1.52mm-3.9mm.

8. The battery housing assembly according to claim 1, characterized in that: The step (35) has a corner region (351), and the ratio of the R angle of the corner region (351) to a is 0.05-15.

9. The battery housing assembly according to claim 8, characterized in that: The R angle of the corner area (351) is 0.1 mm-1.5 mm.

10. The battery housing assembly according to claim 1, characterized in that: The ratio of a to the Brinell hardness of the copper layer (31) is 0.0015 mm-0.1 mm.

11. The battery housing assembly according to claim 10, characterized in that: The ratio of the Brinell hardness of the copper layer (31) to the Brinell hardness of the aluminum layer (32) is 0.4-4.

12. The battery housing assembly according to claim 1, characterized in that: In a direction X in which the pole through hole (11) passes through the battery housing (10), 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) is 0.5-80.

13. The battery housing assembly according to claim 1, characterized in that: In a direction X in which the pole through hole (11) passes through the battery housing (10), the minimum thickness of the aluminum layer (32) included in the protruding section (37) is d, and a / d is 0.03-2.

14. The battery housing assembly according to claim 1, characterized in that: The copper layer (31) and the aluminum layer (32) are integrally formed, and 0.03≤a / b.

15. The battery housing assembly according to claim 1, characterized in that: A groove (36) is formed on a side of the first pole structure (30) facing away from the protruding section (37); The aluminum layer (32) forms at least a portion of the groove wall of the groove (36).

16. The battery housing assembly according to claim 15, characterized in that: In a direction X along which the pole through hole (11) passes through the battery housing (10), the depth e of the groove (36) is 1.5 mm to 6 mm.

17. The battery housing assembly according to claim 16, characterized in that: 0.15mm 2 ≤a×e≤12mm 2 。 18. The battery housing assembly according to claim 1, characterized in that: The step (35) has a corner region (351), the copper layer (31) forms at least a portion of the corner region (351), and the copper layer (31) has a minimum thickness of ≥0.01 mm in the corner region (351).

19. The battery housing assembly according to claim 1, characterized in that: Along a direction Y perpendicular to the direction in which the pole through hole (11) passes through the battery housing (10), the width f of the step (35) is 1.5 mm to 5 mm.

20. The battery housing assembly according to claim 1, characterized in that: Part of the aluminum layer (32) is located within the copper layer (31), a connection area between the aluminum layer (32) and the copper layer (31) includes a curved surface, and a / b is ≤1.

25.

21. A battery, characterized in that: The battery cell (20) comprises a shell assembly and a battery cell (20) as described in any one of claims 1 to 20, wherein the battery cell (20) is arranged in the battery shell (10), the copper layer (31) is electrically connected to the battery cell (20), and at least a portion of the copper layer (31) is arranged on a side of the aluminum layer (32) close to the battery cell (20).

22. The battery according to claim 21, characterized in that The battery housing assembly further comprises a second pole structure (50), the second pole structure (50) being arranged on the battery housing (10), the battery cell (20) comprising a first pole lug (21) and a second pole lug (22) having opposite polarities, the first pole lug (21) being electrically connected to the first pole structure (30), the second pole lug (22) being electrically connected to the second pole structure (50), the first pole structure (30) being a negative pole output terminal, and the second pole structure (50) being a positive pole output terminal; The end surface area of ​​the second pole structure (50) facing away from the battery cell (20) is greater than the end surface area of ​​the first pole structure (30) facing away from the battery cell (20).

23. The battery according to claim 21, characterized in that The battery cell (20) comprises a first pole tab (21), the first pole tab (21) is directly in contact with and connected to the copper layer (31), the first pole tab (21) comprises copper, and 0.028≤a / b.

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