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CN-122003776-A - Battery monomer, electric connecting piece, battery device, power utilization device and energy storage device

CN122003776ACN 122003776 ACN122003776 ACN 122003776ACN-122003776-A

Abstract

The battery unit (100) comprises a shell (1), an electrode assembly (2), an electrode terminal (3) and an electric connecting piece (4). The electrode assembly (2) is positioned in the accommodating cavity (1 a) of the shell (1), the electrode assembly (2) comprises an electrode main body (21) and a tab (22) connected with the electrode main body (21), and the thickness direction of the electrode main body (21) is a first direction. The electrode terminal (3) is inserted into a mounting hole formed in a first wall (11) of the case (1). The electric connector (4) comprises a lug connection part (41), an electrode terminal connection part (42) and an intermediate connection part (43), wherein the lug connection part (41) is connected with the lug (22), the electrode terminal connection part (42) is connected with the electrode terminal (3), the intermediate connection part (43) is connected with the lug connection part (41) and the electrode terminal connection part (42), and the lug connection part (41) and the electrode terminal connection part (42) are positioned on two opposite sides of the intermediate connection part (43) along the second direction. At least one side of the tab connection part (41) along the first direction is provided with an accommodating space (10), and at least part of the tab (22) is accommodated in the accommodating space (10).

Inventors

  • XIE CHENGBIN
  • WU GUANGJIN
  • ZHOU WENLIN
  • GUO ZHIJUN

Assignees

  • 宁德时代新能源科技股份有限公司

Dates

Publication Date
20260508
Application Date
20240731

Claims (20)

  1. A battery cell, wherein the battery cell comprises: a housing having a receiving cavity formed therein, the housing including a first wall formed with a mounting hole; the electrode assembly is positioned in the accommodating cavity and comprises an electrode main body and a tab connected with the electrode main body, and the thickness direction of the electrode main body is a first direction; An electrode terminal penetrating the mounting hole, and The electrode terminal connecting part is connected with the electrode terminal, the middle connecting part is connected with the electrode terminal connecting part, the electrode terminal connecting part and the middle connecting part are positioned on two opposite sides of the middle connecting part along a second direction, and the second direction is perpendicular to the first direction; The tab connection part is provided with an accommodating space along at least one side of the first direction, and at least part of the tab is accommodated in the accommodating space.
  2. The battery cell according to claim 1, wherein, The tab connection part comprises a first surface and a second surface which are opposite along a third direction, wherein the first surface faces the first wall, and the second surface faces away from the first wall; The electrode lug comprises a welding part and a bending part, the welding part is connected with the bending part, the welding part is welded with the second surface of the electrode lug connecting part, the bending part protrudes towards the side where the first wall is located along the third direction relative to the welding part, and the bending part is accommodated in the accommodating space; the third direction is perpendicular to both the first direction and the second direction.
  3. The battery cell according to claim 2, wherein, And along the third direction, the difference between the first dimension and the second dimension is greater than or equal to 0mm and less than or equal to 3mm, wherein the first dimension is the distance dimension between the top surface of the bending part and the first wall, and the second dimension is the distance dimension between the first surface of the tab connection part and the first wall.
  4. The battery cell according to any one of claim 1 to 3, wherein, At least part of the tab connection parts are recessed along the first direction to form groove parts, and the groove parts define at least part of the accommodating space.
  5. The battery cell according to claim 4, wherein, The battery cell further includes an insulating member located at a side of the first wall facing the electrode assembly; The width of the bending part is smaller than the distance between the bottom wall of the groove part and the outer edge of the insulating piece along the first direction.
  6. The battery cell according to claim 5, wherein, A distance dimension between a bottom wall of the groove portion and an outer edge of the insulating member in the first direction is greater than or equal to a third dimension; the third dimension is the sum of the distance dimension between the shell and the insulating piece along the first direction and half of the width of the tab connection part along the first direction.
  7. The battery cell according to claim 6, wherein, The distance between the bottom wall of the groove and the outer edge of the insulator is smaller than or equal to the fourth dimension; Wherein the fourth dimension is one half of the thickness of the battery cell in the first direction minus the third dimension.
  8. The battery cell according to any one of claims 4 to 7, wherein, The width of the groove portion is less than or equal to half the width of the electrical connector along the first direction.
  9. The battery cell according to claim 8, wherein, The width of the groove part is larger than or equal to a fifth dimension along the first direction; The fifth dimension is a dimension of a distance between a bottom of the groove portion and the housing along the first direction minus a dimension of a distance between the electrical connector and the housing along the first direction.
  10. The battery cell according to any one of claims 4 to 9, wherein, Along the second direction, the length of the groove part is smaller than or equal to the length of the electric connecting piece, and is larger than or equal to the length of the tab plus an error dimension.
  11. The battery cell according to any one of claims 1 to 10, wherein, The electrode terminal connection part and the tab connection part extend in the second direction, the intermediate connection part extends in a third direction, and the tab connection part is closer to the first wall than the electrode terminal connection part in the third direction; the third direction is perpendicular to both the first direction and the second direction.
  12. The battery cell according to any one of claims 4 to 11, wherein, The number of the groove parts is two, and the two groove parts are positioned at two opposite sides of the tab connecting part along the first direction; the shape and the size of the two groove parts are the same or different.
  13. The battery cell according to any one of claims 1 to 12, wherein, The tab connection part is flat and/or The electrode terminal connection part is flat.
  14. The battery cell according to any one of claims 1 to 13, wherein, The electrode terminals include a positive electrode terminal and a negative electrode terminal; The electrical connector comprises a first electrical connector and a second electrical connector; The tab comprises a positive tab and a negative tab, the positive tab and the positive terminal are located on the same side, and/or the negative tab and the negative terminal are located on the same side, the positive tab is connected with the positive terminal through the first electric connecting piece, and the negative tab is connected with the negative terminal through the second electric connecting piece.
  15. The battery cell according to any one of claims 1 to 13, wherein, The electrode terminals include a positive electrode terminal and a negative electrode terminal; The electrical connector comprises a first electrical connector and a second electrical connector; The electrode tab comprises an anode tab and a cathode tab, the anode tab and the anode terminal are located on different sides, and/or the cathode tab and the cathode terminal are located on different sides, the anode tab is connected with the anode terminal through the first electric connecting piece, and the cathode tab is connected with the cathode terminal through the second electric connecting piece.
  16. The battery cell according to any one of claims 1 to 15, wherein, The electrode assemblies are arranged in parallel along the first direction, and the electrode lugs with the same polarity of the electrode assemblies are connected through the same electric connecting piece.
  17. An electrical connector for a battery cell, the thickness direction of the battery cell being a first direction, wherein the electrical connector comprises: The tab connection part is used for being connected with the tab of the battery cell; an electrode terminal connection part for connecting with the electrode terminal of the battery cell, and An intermediate connection part connecting the tab connection part and the electrode terminal connection part, the tab connection part and the electrode terminal connection part being positioned at opposite sides of the intermediate connection part in a second direction perpendicular to the first direction; The tab connection part is provided with an accommodating space along at least one side of the first direction, and the accommodating space is used for accommodating at least part of the tab.
  18. A battery device, wherein the battery device comprises: Case body, and At least one battery cell according to any one of claims 1 to 16, which is accommodated in the case.
  19. An electrical device, wherein the electrical device comprises the battery cell of any one of claims 1 to 16 or the battery device of claim 18 for providing electrical energy.
  20. An energy storage device, wherein the energy storage device comprises the battery cell of any one of claims 1 to 16 or the battery device of claim 18 for providing electrical energy.

Description

Battery monomer, electric connecting piece, battery device, power utilization device and energy storage device Technical Field The disclosure relates to the technical field of batteries, and in particular relates to a battery cell, an electric connecting piece, a battery device, an electric device and an energy storage device. Background New energy batteries are increasingly used in life and industry, for example, new energy automobiles equipped with battery devices have been widely used, and in addition, battery devices are increasingly used in the field of energy storage and the like. With the development of battery technology, how to increase the energy density of a battery cell is one of the subjects of research in the industry. Disclosure of Invention In order to solve the technical problems, the present disclosure provides a battery cell, an electrical connector, a battery device, an electricity-using device and an energy storage device with high energy density. The technical scheme of the disclosure is as follows. The first aspect of the disclosure provides a battery cell including a case having a receiving cavity formed therein, the case including a first wall having a mounting hole formed therein, an electrode assembly disposed in the receiving cavity, the electrode assembly including an electrode body and tabs connected to the electrode body, a thickness direction of the electrode body being a first direction, an electrode terminal penetrating the mounting hole, and an electrical connection member including tab connection parts, electrode terminal connection parts and intermediate connection parts, the tab connection parts being connected to the electrode terminal, the electrode terminal connection parts being connected to the electrode terminal connection parts, the electrode terminal connection parts and the electrode terminal connection parts being disposed at opposite sides of the intermediate connection parts in a second direction perpendicular to the first direction, wherein at least one side of the tab connection parts in the first direction has a receiving space, and at least a portion of the tab connection parts is received in the receiving space. Because the tab connecting portion of the electric connecting piece has accommodation space along at least one side of the first direction, and at least part of tab is accommodated in the accommodation space, thereby, the accommodation space of the electric connecting piece along the side of the first direction can be fully utilized, the occupied space of the tab in the height direction (the third direction) is reduced, the tab is not wholly positioned below the electric connecting piece, thereby being beneficial to improving the space utilization rate in the shell of the battery, reserving larger space for the electrode main body, and further properly increasing the volume of the electrode main body and improving the energy density of the battery while not changing the shell size of the battery. In some embodiments, the tab connection portion includes a first surface and a second surface opposite to each other along a third direction, the first surface faces the first wall, the second surface faces away from the first wall, the tab includes a welded portion and a bending portion, the welded portion is connected with the bending portion, the welded portion is welded with the second surface of the tab connection portion, the bending portion protrudes toward the side where the first wall is located along the third direction relative to the welded portion, the bending portion is accommodated in the accommodating space, and the third direction is perpendicular to both the first direction and the second direction. From this, can be through the mode of buckling of change utmost point ear for the structure of utmost point ear is compacter, and whole along the size of third direction is littleer, thereby makes utmost point ear occupation space littleer, practices thrift the space in holding the intracavity of casing, and then makes the space that holds the intracavity and be used for holding the electrode main part increase, is favorable to improving the free energy density of battery. And the bending part of the lug is accommodated in the accommodating space, so that the lateral space of the lug connecting part can be fully utilized, the space in the accommodating cavity of the shell is further saved, and the improvement of the energy density of the battery cell is facilitated. In some embodiments, a difference between a first dimension and a second dimension along the third direction is greater than or equal to 0mm and less than or equal to 3mm, wherein the first dimension is a distance dimension between a top surface of the bend and the first wall, and the second dimension is a distance dimension between the first surface of the tab connection and the first wall. Therefore, along the third direction, the top surface of the bending part is flush with