Battery cell and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery cell and a battery pack, and the battery cell comprises a shell, a cover plate, a plurality of pole groups and connecting sheets, a plurality of avoiding areas are arranged in the width direction of the second conductive part at intervals; and the tabs of the two pole groups in each group extend out of the connecting sheet through the avoiding area and are bent on the outer wall surface of the second conductive part in a back-to-back manner. According to the battery cell with the structure, the tabs are bent in the back direction, and a bending tool can be placed in the space between the adjacent tabs, so that the space utilization rate in the first direction is improved, the opening size of the operation through hole can be reduced, and the strength of the cover plate and the battery cell is improved. And the bending process of the connecting sheet is omitted in the manufacturing process of the battery cell, so that the production efficiency of the battery cell can be improved. The width of the second conductive part is larger than that of the first conductive part, so that the strength of the second conductive part is improved, the non-deformability of the second conductive part is improved, and meanwhile, a plurality of avoiding areas are conveniently formed on the second conductive part in the width direction.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to an electric core and a battery pack. Background Art

[0002] The electric core includes structures such as a housing, a cover plate, a pole group, a conductive connecting piece, a pole column, a first insulating member, a second insulating member, and a sealing member. The pole column, the first insulating member, the second insulating member, and the sealing member are arranged on the cover plate to form a cover plate assembly. The pole group is arranged in the housing. The end of the pole group is provided with a pole ear. The cover plate assembly is arranged on the open end of the housing. The pole ear of the electric core needs to be bent towards one side. When bending the pole ear, a bending tooling is required, and a space for operating the bending tooling needs to be reserved inside the electric core, resulting in low space utilization rate of the electric core. Content of the Utility Model

[0003] In view of this, the utility model provides an electric core and a battery pack to solve the problem of low space utilization rate of the electric core in the prior art.

[0004] In the first aspect, the utility model provides an electric core, comprising:

[0005] A housing, the top of which is provided with an open end;

[0006] A cover plate, arranged at the open end of the housing; two mounting holes and an operation through hole are arranged on the cover plate; a pole column is arranged in the mounting hole;

[0007] A plurality of pole groups, arranged in the housing; a pole ear is arranged on the end face of each pole group facing the cover plate; the plurality of pole groups are arranged in pairs;

[0008] A connecting piece, including a first conductive part and a second conductive part. The first conductive part is electrically connected to the pole column. One side of the second conductive part is connected to the first conductive part, and the other side extends towards the lower side of the operation through hole; along the first direction, the width of the second conductive part is greater than the width of the first conductive part; a plurality of avoidance areas are arranged at intervals in the width direction of the second conductive part; the pole ears of the two pole groups in each group extend out of the connecting piece through the avoidance areas and are bent back on the outer wall surface of the second conductive part.

[0009] Beneficial effects: For the battery cell with this structure, multiple pole groups are arranged in the housing. The tabs at the ends of each pole group extend out of the connecting piece through the avoidance area in the middle of the second conductive part. When bending the tabs, a bending tooling is required, and the bending tooling occupies a certain space. If the tabs of two groups are bent towards the inside of the housing, a certain width of space for the operation through-hole needs to be reserved outside the outermost tab along the first direction to place the bending tooling in this space, which requires increasing the opening size of the operation through-hole, and this will affect the overall strength of the battery cell after the cover plate and the cover plate are welded to the housing. To avoid the over-large opening size of the operation through-hole, the present utility model bends the tabs away from each other, and the space between adjacent tabs can be utilized to place the bending tooling, improving the space utilization rate in the first direction. Thus, there is no need to reserve space outside the outer tab, the opening size of the operation through-hole can be reduced, and the strength of the cover plate and the battery cell can be improved. Moreover, the bending process of the connecting piece is omitted during the manufacturing process of the battery cell, which can improve the production efficiency of the battery cell. Compared with the prior art in which the connecting piece extends a certain distance towards the pole group and then is bent and welded to the tab, the space occupied by the connecting piece in the height direction of the housing can be effectively reduced, and the space utilization rate inside the battery cell can be improved. The width of the second conductive part is greater than the width of the first conductive part, which is beneficial to improving the strength of the second conductive part, enhancing the anti-deformation ability of the second conductive part, preventing the connecting piece from deforming under force during the tab bending process and damaging the pole group and the tab, and at the same time facilitating the opening of multiple avoidance areas on the second conductive part along the width direction.

[0010] In an optional embodiment, the avoidance area includes an avoidance groove, and the avoidance groove is recessed inward from one end of the second conductive part away from the first conductive part.

[0011] In an optional embodiment, along the first direction, the width of each avoidance groove is W1, and the width of the second conductive part is W, and W1 ≤ 0.2W.

[0012] Beneficial effects: Such a setting can control the width of the avoidance groove and the area of the grooved area, enabling the second conductive part to have sufficient solid parts, ensuring the strength and anti-deformation ability of the second conductive part, and preventing the connecting piece from deforming and damaging the pole group and the tab during the tab bending and welding processes.

[0013] In an optional embodiment, along the second direction, the length of the second conductive part is L, and the length of the avoidance groove is L1, and L - L1 ≥ 1 mm.

[0014] Beneficial effects: Such a setting can ensure that the end of the avoidance groove has a sufficient area of the solid part of the second conductive part, thereby ensuring the strength of the second conductive part and preventing the second conductive part from deforming.

[0015] In an optional embodiment, the bottom of the avoidance groove is in an arc surface shape.

[0016] Beneficial effect: When assembling the tab of the battery cell to pass through the avoidance groove, it can prevent the bottom of the avoidance groove from contacting the tab and damaging the tab.

[0017] In an alternative embodiment, the connecting piece includes a positive connecting piece and a negative connecting piece. The thickness of the positive connecting piece is T1, and the thickness of the negative connecting piece is T2, where T1≥1.5 mm and T2≥1.2 mm.

[0018] Beneficial effect: Such a setting can ensure that the positive connecting piece and the negative connecting piece have sufficient strength to prevent the connecting piece from deforming and damaging the tab or the battery cell group.

[0019] In an alternative embodiment, reinforcing ribs are provided on the second conductive part.

[0020] Beneficial effect: The setting of the reinforcing ribs can further improve the overall strength of the second conductive part and the connecting piece, thereby further improving the anti-deformation ability of the second conductive part.

[0021] In an alternative embodiment, there are four battery cell groups, and two avoidance areas are provided in the width direction of the second conductive part. The width between the two avoidance areas is greater than the width of any one of the avoidance areas from the edge of the second conductive part close to it.

[0022] Beneficial effect: Such a setting can ensure the strength and anti-deformation ability of the second conductive part; at the same time, two tabs need to be welded on the second conductive part between the two avoidance areas, which can ensure the width of the second conductive part in this area and the welding width with the tabs, thereby ensuring the over-current capacity of the battery cell.

[0023] In an alternative embodiment, it further includes a sealing plate, and the sealing plate is hermetically arranged on the operation through hole.

[0024] In a second aspect, the present invention further provides a battery pack, including the battery cell described in any one of the above. The battery pack includes the battery cell and has the same technical effects as the battery cell, which will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 It is a three-dimensional structure schematic diagram of a battery cell according to an embodiment of the present invention;

[0027] Figure 2 Schematic diagram during the assembly process of a battery cell according to an embodiment of the present invention;

[0028] Figure 3 Schematic diagram after the tab of the battery cell is bent during the assembly process according to an embodiment of the present invention;

[0029] Figure 4 Schematic diagram of the cooperation of the electrode group, tab and connecting piece in the battery cell according to an embodiment of the present invention;

[0030] Figure 5 Schematic diagram of the cooperation of the electrode group, tab and connecting piece after the tab of the battery cell is bent according to an embodiment of the present invention;

[0031] Figure 6 Schematic diagram of the three-dimensional structure of the connecting piece in the battery cell according to an embodiment of the present invention;

[0032] Figure 7 Top view of the connecting piece in the battery cell according to an embodiment of the present invention.

[0033] Explanation of reference numerals:

[0034] 1. Housing; 2. Cover plate; 21. Operation through hole; 3. Electrode group; 4. Tab; 5. Connecting piece; 51. First conductive part; 52. Second conductive part; 521. Avoidance area; 6. Electrode post; 7. Sealing plate. Detailed implementation manners

[0035] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0036] The side of each component of the battery cell facing the outside of the housing 1 is called the outer side, and the side of each component facing the inside of the housing 1 is called the inner side. The upper part refers to the upper part in the z direction when the battery cell is in the Figure 1 state, and the lower part refers to the lower part in the z direction when the battery cell is in the Figure 1 state. When the battery cell is in the Figure 1 state, the x direction refers to the length direction of the battery cell, the y direction refers to the thickness direction of the battery cell, and the z direction refers to the height direction of the battery cell.

[0037] Next, with reference to Figures 1 to 7 , the embodiments of the present invention will be described.

[0038] According to an embodiment of the present utility model, on the one hand, a battery cell is provided, which includes a housing 1, a cover plate 2, a plurality of electrode groups 3, and a connecting piece 5.

[0039] Among them, an open end is provided at the top of the housing 1; the cover plate 2 is arranged at the open end of the housing 1; two mounting holes and an operation through hole 21 are provided on the cover plate 2; electrode posts 6 are arranged in the mounting holes; a plurality of electrode groups 3 are arranged in the housing 1; an electrode tab 4 is provided on the end face of each electrode group 3 facing the cover plate 2; the plurality of electrode groups 3 are arranged in pairs; the connecting piece 5 includes a first conductive part 51 and a second conductive part 52, the first conductive part 51 is electrically connected to the electrode post 6, one side of the second conductive part 52 is connected to the first conductive part 51, and the other side extends downward toward the lower side of the operation through hole 21; along the first direction (y direction), the width of the second conductive part 52 is greater than the width of the first conductive part 51; a plurality of avoidance areas 521 are arranged at intervals in the width direction of the second conductive part 52; the electrode tabs 4 of the two electrode groups 3 in each group extend out of the connecting piece 5 through the avoidance area 521 and are bent backward on the outer wall surface of the second conductive part 52.

[0040] For the battery cell with this structure, a plurality of electrode groups 3 are arranged in the housing 1, and the electrode tabs 4 at the ends of each electrode group 3 extend out of the connecting piece 5 through the avoidance area 521 in the middle of the second conductive part 52, and the electrode tabs 4 are bent through the operation through hole 21 on the cover plate 2. When bending the electrode tabs 4, a bending tooling is required, and the bending tooling needs to occupy a certain space. If the two groups of electrode tabs 4 are bent toward the inside of the housing 1, a certain width of space for the operation through hole 21 needs to be reserved outside the outermost electrode tab 4 along the first direction, so as to place the bending tooling in this space, which requires increasing the opening size of the operation through hole 21, and this will affect the overall strength of the battery cell after the cover plate 2 and the cover plate 2 are welded to the housing 1. In order to avoid the opening size of the operation through hole 21 being too large, the present utility model bends the electrode tabs 4 backward, and the space between adjacent electrode tabs 4 can be used to place the bending tooling, improving the space utilization rate in the first direction, so that there is no need to reserve space outside the outer electrode tab 4, the opening size of the operation through hole 21 can be reduced, and the strength of the cover plate 2 and the battery cell can be improved. And the bending process of the connecting piece 5 can be omitted during the manufacturing process of the battery cell, which can improve the production efficiency of the battery cell. Compared with the prior art in which the connecting piece 5 extends a certain distance toward the electrode group 3 and then the connecting piece 5 is bent and welded to the electrode tab 4, the space occupied by the connecting piece 5 in the height direction of the housing 1 can be effectively reduced, and the space utilization rate inside the battery cell can be improved. The width of the second conductive part 52 is greater than the width of the first conductive part 51, which is beneficial to improving the strength of the second conductive part 52, enhancing the anti-deformation ability of the second conductive part 52, preventing the connecting piece 5 from being deformed by force during the bending process of the electrode tabs 4 and damaging the electrode group 3 and the electrode tabs 4, and at the same time facilitating the opening of a plurality of avoidance areas 521 on the second conductive part 52 along the width direction.

[0041] Optionally, in some embodiments, such as Figure 6 and Figure 7As shown, the avoidance area 521 includes an avoidance groove, which is recessed inward from one end of the second conductive part 52 away from the first conductive part 51. The avoidance groove penetrates through the wall thickness of the second conductive part 52, and the tab 4 bends toward the outer wall surfaces of the second conductive part 52 on both sides of the avoidance groove after protruding from the avoidance groove.

[0042] In other embodiments, the avoidance area 521 may further include an avoidance hole provided on the second conductive part 52, and the tab 4 protrudes from the avoidance hole.

[0043] In some embodiments, the first conductive part 51 is welded to the terminal post 6, and the second conductive part 52 is welded to the tab 4, thereby realizing the electrical connection between the electrode group 3 and the terminal post 6.

[0044] As Figure 7 shown, in some embodiments, along the first direction (y direction), the width of each avoidance groove is W1, and the width of the second conductive part 52 is W, where W1 ≤ 0.2W. Such a setting can control the width of the avoidance groove and the area of the grooved area, so that the second conductive part 52 has sufficient solid parts, ensuring the strength and anti-deformation ability of the second conductive part 52, and preventing the tab 4 from being bent and the connecting piece 5 from being deformed during the welding process to damage the electrode group 3 and the tab 4.

[0045] In some embodiments, as Figure 7 shown, along the second direction (x direction), the length of the second conductive part 52 is L, and the length of the avoidance groove is L1, where L - L1 ≥ 1 mm, that is, the distance between the inner end of the avoidance groove and one end of the second conductive part 52 facing the first conductive part 51 is greater than 1 mm. Such a setting can ensure that the end of the avoidance groove has a sufficient area of the solid part of the second conductive part 52, thereby ensuring the strength of the second conductive part 52 and preventing the second conductive part 52 from being deformed.

[0046] In some embodiments, as Figure 6 and Figure 7 shown, the bottom of the avoidance groove is in the shape of an arc surface, and the bottom of the avoidance groove is smooth. When assembling the tab 4 of the battery cell to pass through the avoidance groove, it can prevent the bottom of the avoidance groove from contacting the tab 4 and damaging the tab 4.

[0047] In some embodiments, the connecting piece 5 includes a positive connecting piece and a negative connecting piece. The thickness of the positive connecting piece is T1, and the thickness of the negative connecting piece is T2, where T1 ≥ 1.5 mm and T2 ≥ 1.2 mm. Such a setting can ensure that the positive connecting piece and the negative connecting piece have sufficient strength, preventing the connecting piece 5 from being deformed to damage the tab 4 or the electrode group 3.

[0048] The terminal post 6 includes a positive terminal post and a negative terminal post. The tab 4 includes a positive tab and a negative tab. The positive terminal post and the negative terminal post are disposed in the mounting holes on both sides of the operation through-hole 21 along the second direction. The positive tab and the negative tab are spaced apart along the second direction of the electrode group 3. The first conductive portion 51 of the positive connection piece is welded to the positive terminal post, and the second conductive portion 52 of the positive connection piece is welded to the positive tab. The first conductive portion 51 of the negative connection piece is welded to the negative terminal post, and the second conductive portion 52 of the negative connection piece is welded to the negative tab.

[0049] In some embodiments, reinforcing ribs (not shown in the figure) are provided on the second conductive portion 52. The provision of the reinforcing ribs can further improve the overall strength of the second conductive portion 52 and the connection piece 5, thereby further improving the anti-deformation ability of the second conductive portion 52.

[0050] Optionally, the reinforcing ribs are provided on the outer wall surface of the second conductive portion 52 and extend along the second direction (x direction).

[0051] As Figure 4 and Figure 5 shown, in some embodiments, there are four electrode groups 3. Two avoidance areas 521 are provided in the width direction of the second conductive portion 52. The width between the two avoidance areas 521 is greater than the width of any avoidance area 521 from the edge of the second conductive portion 52 on the side close to it, that is, the width of the second conductive portion 52 between the two avoidance areas 521 is greater than the width of the second conductive portion 52 outside the avoidance area 521 (the outside along the first direction). Such a setting can ensure the strength and anti-deformation ability of the second conductive portion 52; at the same time, two tabs 4 need to be welded on the second conductive portion 52 between the two avoidance areas 521, which can ensure the width of the second conductive portion 52 in this area and the welding width with the tab 4, thereby ensuring the over-current capacity of the battery cell.

[0052] In some embodiments, as Figure 1 shown, the battery cell further includes a sealing plate 7. The sealing plate 7 is sealingly disposed on the operation through-hole 21 so that the battery cell as a whole forms a sealed structure.

[0053] Optionally, in some embodiments, the sealing plate 7 is welded to the cover plate 2.

[0054] According to an embodiment of the present invention, on the other hand, a battery pack is further provided, including the above-mentioned battery cell.

[0055] For the battery pack with this structure, the tabs 4 of the internal battery cells are bent backward, and the space between adjacent tabs 4 can be utilized to place the bending tooling, improving the space utilization rate in the first direction. Thus, there is no need to reserve space outside the external tabs 4, the opening size of the operation through hole 21 can be reduced, and the strength of the cover plate 2 and the battery cells can be improved. Moreover, the bending process of the connecting piece 5 can be omitted during the manufacturing process of the battery cells, improving the production efficiency of the battery cells. At the same time, the space occupied by the connecting piece 5 in the height direction of the housing 1 can be effectively reduced, improving the space utilization rate inside the battery cells, and thus improving the volume energy density of the battery cells and the battery pack.

[0056] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A battery cell, characterized in that, Comprising: A housing having an open end at its top; A cover plate provided at the open end of the housing; two mounting holes and an operation through-hole are provided on the cover plate; pole columns are provided in the mounting holes; A plurality of pole groups provided in the housing; pole lugs are provided on the end faces of each pole group facing the cover plate; the plurality of pole groups are arranged in pairs; A connecting piece including a first conductive portion and a second conductive portion, the first conductive portion is electrically connected to the pole column, one side of the second conductive portion is connected to the first conductive portion, and the other side extends downward toward the lower side of the operation through-hole; along a first direction, the width of the second conductive portion is greater than the width of the first conductive portion; a plurality of avoidance areas are provided at intervals in the width direction of the second conductive portion; the pole lugs of the two pole groups in each group extend out of the connecting piece through the avoidance areas and are bent backward on the outer wall surface of the second conductive portion.

2. The battery cell according to claim 1, characterized in that, The avoidance area includes an avoidance groove, and the avoidance groove is recessed inward from one end of the second conductive portion away from the first conductive portion.

3. The battery cell according to claim 2, wherein, Along the first direction, the width of each avoidance groove is W1, and the width of the second conductive portion is W, and W1 ≤ 0.2W.

4. The battery cell according to claim 2 or 3, characterized in that, Along a second direction, the length of the second conductive portion is L, and the length of the avoidance groove is L1, and L - L1 ≥ 1 mm.

5. The cell according to claim 2 or 3, characterized in that, The bottom of the avoidance groove is in the shape of an arc surface.

6. The battery cell according to any one of claims 1 to 3, characterized in that, The connecting piece includes a positive connecting piece and a negative connecting piece, the thickness of the positive connecting piece is T1, and the thickness of the negative connecting piece is T2, T1 ≥ 1.5 mm, T2 ≥ 1.2 mm.

7. The battery cell according to any one of claims 1 to 3, characterized in that, Reinforcing ribs are provided on the second conductive portion.

8. The battery cell according to any one of claims 1 to 3, characterized in that, There are four pole groups, two avoidance areas are provided in the width direction of the second conductive portion, and the width between the two avoidance areas is greater than the width of any one of the avoidance areas from the edge of the second conductive portion close to its side.

9. The battery cell according to any one of claims 1 to 3, characterized in that, It further includes a sealing plate, and the sealing plate is hermetically arranged on the operation through-hole.

10. A battery pack, characterized in that, Including the battery cell according to any one of claims 1 to 9.

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