Battery monomer and electric equipment

Abstract

The invention relates to a battery monomer and electric equipment, and the battery monomer comprises a top cover assembly which is provided with a pole; a tab is led out from the end face, facing the top cover assembly, of the battery cell; and an electrode adapter, the electrode adapter comprises a pole connecting part extending along the second direction, a bending part formed by bending from one end of the pole connecting part to the tab direction, and a tab connecting part connected with the bending tail end of the bending part; wherein the bending part is provided with a fusing part, and the area of the cross section of the area where the fusing part is located is smaller than the area of the cross section of a non-fusing area on the bending part. The fusing part is arranged on the bending part, so that the whole area of the tab connecting part can be used for connecting the tabs, and the offset space of the tabs in the extension direction of the tab connecting part is increased; the tab connecting part of the electrode adapter can be wholly used for connecting the tabs, the area for connecting the tabs is increased, and the designable area of the tabs is correspondingly increased, so that the current bearing capacity of the tabs is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to battery cells and electrical equipment. Background Art

[0002] As a new energy source, lithium batteries play an increasingly important role in energy storage and power. Compared with lithium iron phosphate batteries, ternary lithium batteries have higher energy density, but their safety is poor, and a circuit breaker device is required in the battery cell unit when the external circuit is short-circuited. At present, most ternary lithium batteries use a fuse structure as a circuit breaker on the positive electrode adapter, in which the positive electrode adapter is a sheet structure, and the front and back sides of the positive electrode adapter are used to connect the positive electrode ear and the positive electrode column respectively.

[0003] The above-mentioned fuse structure is arranged on the sheet-shaped positive electrode adapter. Although the structure is simple, it has the following defects:

[0004] Since part of the area of ​​the positive electrode adapter is used to set the fuse part, the area of ​​the positive electrode adapter used to connect the pole ear is correspondingly reduced, which in turn limits the space where the pole ear can be offset in the extension direction of the positive electrode adapter, and ultimately causes difficulties in the design of the entire battery cell;

[0005] In addition, since the area of ​​the positive electrode adapter used to connect the pole ear is correspondingly reduced, the designable area of ​​the pole ear is also correspondingly reduced, which in turn limits or reduces the current carrying capacity of the pole ear. Summary of the invention

[0006] The embodiments of the present application provide battery cells and electrical equipment to solve the technical problems in the prior art of difficulty in battery cell design and overcurrent limitation caused by the reduction of the offset space of the tabs in the horizontal direction.

[0007] In order to solve the above technical problems, the present invention provides a battery cell, comprising:

[0008] A top cover assembly, on which a pole is disposed;

[0009] A battery cell, which is arranged on one side of the top cover assembly along a first direction, and the battery cell has a tab extending from an end surface facing the top cover assembly; and

[0010] an electrode adapter, which is arranged between the battery cell and the top cover assembly along the first direction and is used to connect the pole and the pole tab; the electrode adapter includes a pole connecting portion extending along the second direction, a bent portion bent from one end of the pole connecting portion toward the pole tab, and a pole tab connecting portion connected to the bent end of the bent portion, wherein the second direction is perpendicular to the first direction;

[0011] Wherein, a fuse portion is arranged on the bending portion, and the cross-sectional area of ​​the region where the fuse portion is located is smaller than the cross-sectional area of ​​the non-fuse region on the bending portion.

[0012] In one embodiment of the present invention, the bending portion is configured to be deformable during assembly, and the electrode adapter has at least a first state before the bending portion is assembled, and has at least a second state after the bending portion is assembled:

[0013] When the electrode adapter is in the first state, the bent portion is perpendicular to the pole connecting portion and the pole lug connecting portion, and the pole connecting portion and the pole lug connecting portion are staggered along the second direction;

[0014] When the electrode adapter is in the second state, the bent portion is connected to the pole connection portion and the tab connection portion at an acute angle, and projections of the pole connection portion, the tab connection portion and the bent portion along the first direction at least partially overlap.

[0015] In one embodiment of the present invention, a receiving groove is provided on the side of the pole facing the electrode adapter, and the electrode adapter is assembled into the receiving groove; wherein the pole connecting portion and at least part of the bent portion are accommodated in the receiving groove, and the pole connecting portion is fittedly connected to the bottom of the receiving groove, and the pole ear connecting portion is exposed and arranged outside the receiving groove.

[0016] In one embodiment of the present invention, the edge of the slot opening of the accommodating slot is turned outward to form an extension portion, and an insulating gap is provided between the tab connecting portion and the extension portion.

[0017] In one embodiment of the present invention, the top cover assembly comprises:

[0018] a top cover sheet having a first mounting hole thereon; and,

[0019] A first insulating member, which is arranged on one side of the top cover sheet along the first direction and is located between the top cover sheet and the battery core; the first insulating member is provided with a second mounting hole and an adapter via hole which are interconnected, and a support portion is extended from the connection between the second mounting hole and the adapter via hole toward the center of the second mounting hole, and the support portion is penetrated in the insulating gap; the first mounting hole, the second mounting hole and the adapter via hole are distributed in sequence along the first direction and are arranged coaxially;

[0020] The pole is assembled into the second mounting hole, and the support portion supports the extension portion and is closely connected thereto; a portion of the pole is also inserted into the first mounting hole for assembly;

[0021] The tab connection portion is exposed to the outside of the adapter through hole, and the side of the tab connection portion facing the pole is in contact with the support portion.

[0022] In one embodiment of the present invention, the top cover assembly also includes a snap ring, which is inserted into the second mounting hole and arranged around the pole; wherein the snap ring is snapped with the inner wall of the second mounting hole, one side of the snap ring in the first direction abuts against the extension portion, and the other side of the snap ring in the first direction contacts the side of the top cover sheet facing the first insulating member.

[0023] In one embodiment of the present invention, the top cover assembly also includes a sealing ring, which is sleeved outside the pole and abuts the extension portion, the sealing ring is located in the inner ring of the clamping ring, and the sealing ring is sealed and connected to the side of the top cover sheet facing the first insulating member.

[0024] In one embodiment of the present invention, the top cover assembly also includes a second insulating member, which is sleeved on the pole along the first direction and pressed on the side of the top cover sheet away from the first insulating member, and a partial area of ​​the second insulating member fills the gap between the pole and the top cover.

[0025] In one embodiment of the present invention, the electrode adapter has a set height before assembly, and the set height is determined based on the following formula:

[0026]

[0027] Among them, h represents the height of the electrode adapter before assembly; a represents the depth of the accommodating groove; b represents the thickness of the supporting portion; c represents the thickness of the pole connecting portion; d represents the thickness of the pole ear connecting portion; e represents the thickness of the bending portion; and f represents the groove width of the accommodating groove along the first direction.

[0028] The present invention also provides an electrical device, comprising the above-mentioned battery cell.

[0029] The above technical solution of the present invention has the following beneficial effects compared with the prior art:

[0030] The electrode adapter in the present invention includes a pole connecting portion, a bent portion formed by bending from one end of the pole connecting portion toward the pole ear, and a pole ear connecting portion connected to the bent end of the bent portion, so that the electrode adapter is roughly Z-shaped, that is, the pole connecting portion, the bent portion and the pole ear connecting portion are arranged in layers in the first direction, and because the fuse portion is arranged on the bent portion, the entire area of ​​the pole ear connecting portion can be used to connect the pole ear, thereby increasing the space in which the pole ear can be offset in the extension direction of the pole ear connecting portion;

[0031] The entire area of ​​the pole ear connection portion of the electrode adapter in the present invention can be used to connect the pole ear. Compared with the existing sheet-shaped electrode adapter in which only a part of the area is used to connect the pole ear, the area used to connect the pole ear is increased, and the designable area of ​​the pole ear is also increased accordingly, thereby improving the current carrying capacity of the pole ear.

[0032] A receiving groove is provided on the pole, so the overall volume of the pole is reduced, thereby reducing the manufacturing cost of the pole, and further reducing the manufacturing cost of the battery cell; since the electrode adapter can be accommodated in the receiving groove of the pole, the space occupied by the electrode adapter and the pole in the height direction is reduced. When the overall height of the battery cell is determined, the height at which the battery cell can be set is increased, thereby improving the space utilization of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments of the present invention in conjunction with the accompanying drawings, wherein

[0034] Figure 1 is an exploded view of a battery cell in the present invention;

[0035] Figure 2 is a cross-sectional view of a battery cell in the present invention;

[0036] Figure 3 is an exploded view of the top cover assembly of the present invention;

[0037] Figure 4 is a partial cross-sectional view of the top cover assembly of the present invention;

[0038] Figure 5 is a partial cross-sectional view of the top cover assembly of the present invention;

[0039] Figure 6 is a partial cross-sectional view of the first insulating member in the present invention;

[0040] Figure 7 is a cross-sectional view of the connection between the electrode adapter and the pole in the present invention;

[0041] Figure 8 is a schematic structural diagram of the adapter in the present invention in the second state;

[0042] Fig. 9 is a schematic structural diagram of the adapter in the present invention in a first state;

[0043] Fig.10 It is a schematic diagram of the structure of the pole in the present invention;

[0044] Fig.11 It is a schematic diagram of the structure of the pole and the guide block in the present invention.

[0045] Explanation of the reference numerals in the drawings in the specification: 10. electrode adapter; 11. pole connecting portion; 12. pole ear connecting portion; 13. bending portion; 131. groove; 20. pole; 21. accommodation groove; 22. pole body; 23. extension portion; 24. conductive block; 241. snap-in groove; 30. first insulating member; 31. second mounting hole; 32. adapter through hole; 33. support portion; 40. top cover sheet; 50. sealing ring; 60. snap ring; 70. second insulating member; 80. battery cell; 90. pole ear; 100. shell. DETAILED DESCRIPTION

[0046] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0047] Reference Figures 1 to 3 As shown in 8, a battery cell comprises:

[0048] A top cover assembly, on which a pole 20 is arranged;

[0049] A battery cell 80 is disposed on one side of the top cover assembly along a first direction, and a tab 90 is led out from the end surface of the battery cell 80 toward the top cover assembly; and

[0050] The electrode adapter 10 is arranged between the battery cell 80 and the top cover assembly along the first direction and is used to connect the pole 20 and the pole ear 90; the electrode adapter 10 includes a pole connecting portion 11 extending along the second direction, a bending portion 13 formed by bending from one end of the pole connecting portion 11 toward the direction of the pole ear 90, and a pole ear connecting portion 12 connected to the bent end of the bending portion 13, and the second direction is perpendicular to the first direction; preferably, the pole ear connecting portion 12 also extends in the second direction and is parallel to the pole connecting portion 11;

[0051] The bending portion 13 is provided with a fuse portion 131, and the cross-sectional area of ​​the region where the fuse portion 131 is located is smaller than the cross-sectional area of ​​the non-fuse region on the bending portion 13. When a short circuit occurs in the battery, the current increases, and the cross-sectional area of ​​the fuse portion 131 is smaller than the cross-sectional area of ​​other non-fuse regions, then the resistance of the fuse portion is large, and a large amount of heat can be generated, which melts the electrode adapter 10 and cuts off the circuit.

[0052] Specifically, the bending portion 13 can be designed as a square plate structure, and a through hole with an opening facing outward is respectively opened on both sides along the width direction of the bending portion 13, or a closed through hole is opened in the middle of the bending portion 13, so as to form a fuse portion 131, and the cross-sectional area of ​​the fuse portion 131 is smaller than the cross-sectional area of ​​the square plate structure. Optionally, the through hole can be a square hole, a round hole or a hole of other shapes. Alternatively, the bending portion 13 can be formed into the fuse portion 131 by reducing the thickness.

[0053] The thickness of the pole connecting portion 11 , the pole tab connecting portion 12 and the bending portion 13 is 0.3 mm to 2.5 mm, and the specific thicknesses of the three can be the same or different.

[0054] The electrode adapter 10 in the embodiment of the present invention includes a pole connecting portion 11, a bending portion 13 formed by bending from one end of the pole connecting portion 11 toward the direction of the pole ear 90, and a pole ear connecting portion 12 connected to the bent end of the bending portion 13, so that the electrode adapter 10 is approximately Z-shaped, or it can be said that the pole connecting portion 11, the bending portion 13 and the pole ear connecting portion 12 are arranged in layers in the first direction; since the fuse portion 131 is arranged on the bending portion 13, the space occupied by the electrode adapter 10 in the second direction is reduced, thereby increasing the space that the pole ear 90 can be offset and misplaced in the second direction; the pole ear 90 can be adjusted to a suitable position along the extension direction of the pole ear connecting portion 12 as needed and then connected to the pole ear connecting portion 12, which provides more design possibilities for the pole ear 90 and reduces the design difficulty of the battery cell; at the same time, since the pole ear and the fuse portion 131 are staggered in the second direction, the problem of the fuse portion 131 being overlapped with the pole ear for the second time after the fuse portion 131 is melted and the circuit is re-connected can be avoided.

[0055] The entire area of ​​the pole lug connecting portion 12 of the electrode adapter 10 in the embodiment of the present invention can be used to connect the pole lug 90. Compared with the existing sheet-shaped electrode adapter in which only a partial area is used to connect the pole lug, the area of ​​the pole lug connecting portion 12 in this embodiment used to connect the pole lug 90 is increased, so the designable area of ​​the pole lug 90 is also increased accordingly, thereby improving the current carrying capacity of the pole lug 90.

[0056] The pole lug connection portion 12 and the fuse portion 131 of the electrode adapter 10 in this embodiment are staggered in the second direction. Compared with the existing sheet-like electrode adapter in which the pole lug connection portion and the fuse portion are sequentially arranged along the second direction, the space occupied by the electrode adapter in the second direction can be reduced. On the one hand, the pole lug connection portion and the pole lug can be designed to be larger, thereby improving the current carrying capacity, reducing the internal resistance of the battery, and improving the energy conversion rate. On the other hand, sufficient pole lug staggered space can be provided.

[0057] Reference Fig. 9As shown, in some embodiments of the battery cell of the present invention, the bending portion 13 is configured to be deformable during assembly, and the electrode adapter 10 has at least a first state before the bending portion 13 is assembled, and has at least a second state after the bending portion 13 is assembled:

[0058] When the electrode adapter 10 is in the first state, the bending portion 13 is perpendicular to the pole connecting portion 11 and the pole tab connecting portion 12, and the pole connecting portion 11 and the pole tab connecting portion 12 are staggered along the second direction;

[0059] Reference Figure 8 As shown, when the electrode adapter 10 is in the second state, the bending portion 13 is connected to the pole connection portion 11 and the tab connection portion 12 at an acute angle, and the projections of the pole connection portion 11, the tab connection portion 12 and the bending portion 13 along the first direction at least partially overlap.

[0060] In this embodiment, the assembly process of the electrode adapter 10, the electrode column 20, and the electrode ear 90 is as follows:

[0061] The pole connecting portion 11 of the electrode adapter 10 in the first state is electrically connected to the pole 20. The pole connecting portion 11 and the pole 20 may be connected by welding, so as to realize the circuit flow between the electrode adapter 10 and the pole 20.

[0062] After the electrode adapter 10 is electrically connected to the pole 20, the pole lug connection portion 12 of the electrode adapter 10 in the first state is pushed, and the bending portion 13 is also subjected to force and begins to bend from a state perpendicular to the pole lug connection portion 12, so that the pole lug connection portion 12 gradually approaches the pole connection portion 11 in both the first direction and the second direction;

[0063] Continue to push the pole lug connection portion 12 until the projections of the pole column connection portion 11, the pole lug connection portion 12 and the bent portion 13 along the first direction at least partially overlap, preferably until Figure 8 The projections of the pole connecting portion 11, the pole ear connecting portion 12 and the bending portion 13 along the first direction are all overlapped;

[0064] Finally, the tab connection portion 12 of the electrode adapter 10 is electrically connected to the tab 90 . The tab connection portion 12 and the tab 90 may be connected by welding, thereby achieving circuit flow between the tab connection portion 12 and the tab 90 .

[0065] In this embodiment, since the pole connection portion 11 and the pole lug connection portion 12 of the electrode adapter 10 in the first state are misaligned in the first direction, the pole lug connection portion 12 will not block the pole connection portion 11 in the first direction, so that it is convenient to weld the pole connection portion 11 of the electrode adapter 10 with the pole 20; after the pole connection portion 11 and the pole 20 are welded, the pole lug connection portion 12 is pushed, so that the electrode adapter 10 is assembled with the pole lug 90 and the pole 20 in the second state. If the electrode adapter 10 is welded with the pole 20 in the second state, since the pole lug connection portion 12 and the pole connection portion 11 at least partially overlap in the first direction, the pole lug connection portion 12 blocks the pole connection portion 11 in the first direction, so that it is not convenient for tools such as welding guns to weld the pole connection portion 11 of the electrode adapter 10 with the pole 20.

[0066] Since the pole connection part 11, the pole lug connection part 12 and the bending part 13 of the electrode adapter 10 of the present invention are arranged in layers in the first direction, the electrode adapter 10 occupies more space in the first direction, which limits the space utilization of the battery cell. Figures 4 to 7 As shown, in some embodiments of the battery cell of the present invention, a receiving groove 21 is provided on the side of the pole 20 facing the electrode adapter 10, and the electrode adapter 10 is assembled into the receiving groove 21; wherein, the pole connecting portion 11 and at least part of the bent portion 13 are accommodated in the receiving groove 21, and the pole connecting portion 11 is fitted and connected with the bottom of the receiving groove 21, and the pole ear connecting portion 12 is exposed and arranged outside the receiving groove 21.

[0067] In this embodiment, the assembly process of the electrode adapter 10, the electrode column 20, and the electrode tab 90 is as follows:

[0068] The pole connecting portion 11 of the electrode adapter 10 in the first state is electrically connected to the bottom of the receiving groove 21 of the pole 20, so as to realize the circuit flow between the electrode adapter 10 and the pole 20. At this time, the pole ear connecting portion 12 of the electrode adapter 10 is exposed outside the receiving groove 21.

[0069] After the electrode adapter 10 is electrically connected to the pole 20, the pole lug connection portion 12 of the electrode adapter 10 in the first state is pushed, and the bending portion 13 is also subjected to force and starts to bend from a state perpendicular to the pole lug connection portion 12, so that the pole lug connection portion 12 gradually approaches the pole connection portion 11 in both the first direction and the second direction;

[0070] Continue to push the pole lug connection portion 12 until the projections of the pole column connection portion 11, the pole lug connection portion 12 and the bent portion 13 along the first direction at least partially overlap (optimally, until Figure 8The projections of the pole connection portion 11, the pole tab connection portion 12 and the bending portion 13 along the first direction are all overlapped), and the pole tab connection portion 12 covers the receiving groove 21 of the pole 20, and the pole tab connection portion 12 is still exposed outside the receiving groove 21;

[0071] Finally, the tab connection portion 12 of the electrode adapter 10 is electrically connected to the tab 90 to achieve circuit flow between the tab connection portion 12 and the tab 90 .

[0072] In this embodiment, a receiving groove 21 is provided on the pole 20, so that the overall volume of the pole 20 is reduced, thereby reducing the manufacturing cost of the pole 20, and further reducing the manufacturing cost of the battery cell; since the electrode adapter 10 and the pole 20 can be accommodated in the receiving groove 21 of the pole 20 after being assembled, the space occupied by the electrode adapter 10 and the pole 20 in the height direction is reduced. When the overall height of the battery cell is determined, the height at which the battery cell 80 can be set is increased, thereby improving the space utilization of the battery cell.

[0073] In addition, since the pole connecting portion 11 and the pole lug connecting portion 12 of the electrode adapter 10 in the first state are misaligned in the first direction, the pole lug connecting portion 12 will not block the pole connecting portion 11 in the first direction, so it is convenient to connect the pole connecting portion 11 of the electrode adapter 10 with the receiving groove 21 of the pole 20. If the electrode adapter 10 is connected to the receiving groove 21 of the pole 20 in the second state, since the pole lug connecting portion 12 and the pole connecting portion 11 at least partially overlap in the first direction, the pole lug connecting portion 12 blocks the pole connecting portion 11 in the first direction, and the space of the receiving groove 21 is very small, it is not convenient to electrically connect the pole connecting portion 11 of the electrode adapter 10 with the bottom of the receiving groove 21 of the pole 20.

[0074] Reference Figure 7 As shown, in some embodiments of the battery cell of the present invention, the edge of the notch of the receiving groove 21 is turned outward to form an extension portion 23 , and an insulating gap is provided between the tab connecting portion 12 and the extension portion 23 .

[0075] In this embodiment, the edge of the notch of the accommodating groove 21 is turned outward to form an extension portion 23, and an insulating gap is provided between the pole lug connecting portion 12 and the extension portion 23. The existence of the insulating gap can ensure that the pole lug connecting portion 12 and the extension portion 23 do not contact each other and form an insulated state between the two, thereby preventing the pole lug connecting portion 12 and the pole 20 from still being electrically connected even after the fuse portion 131 of the electrode adapter 10 is melted, thereby ensuring that when the electrode adapter 10 is overcurrent, the fuse portion 131 can be melted and the purpose of protecting the battery cell is successfully achieved;

[0076] There is an insulating gap between the tab connection part 12 and the extension part 23, so the tab connection part 12 forms a notch of the cover receiving groove 21, and the molten beads generated after the fuse part 131 is melted will be completely taken up by the tab connection part 12, avoiding the damage of the molten beads to the battery cell.

[0077] Reference Figure 1 As shown in 4 to 6, in some embodiments of the battery cell of the present invention, the top cover assembly includes:

[0078] A top cover sheet 40 having a first mounting hole formed therein; and

[0079] The first insulating member 30 is arranged on one side of the top cover sheet 40 along the first direction and is located between the top cover sheet 40 and the battery cell 80; the first insulating member 30 is provided with a second mounting hole 31 and an adapter via 32 which are interconnected, and a support portion 33 extends from the connection between the second mounting hole 31 and the adapter via 32 toward the center of the second mounting hole 31, and the support portion 33 is penetrated in the insulating gap; the first mounting hole, the second mounting hole 31 and the adapter via 32 are distributed in sequence along the first direction and are coaxially arranged; the first insulating member 30 can be made of plastic or other insulating materials.

[0080] The pole 20 is assembled into the second mounting hole 31, and the support portion 33 supports the extension portion 23 of the pole 20 and is closely connected thereto; a portion of the pole 20 is also inserted into the first mounting hole for assembly;

[0081] The tab connection portion 12 is exposed to the outside of the adapter through hole 32 , and the side of the tab connection portion 12 facing the pole 20 abuts against the support portion 33 .

[0082] On the one hand, the support portion 33 supports the pole lug connection portion 12; on the other hand, the support portion 33 is inserted into the insulating gap formed between the pole lug connection portion 12 and the extension portion 23, and the pole lug connection portion 12 abuts against the side of the support portion 33 away from the extension portion 23. In this way, the support portion 33 insulates the pole lug connection portion 12 and the extension portion 23, thereby avoiding the problem that the pole lug connection portion 12 and the pole 20 can still be electrically connected even after the fuse portion 131 of the electrode adapter 10 is blown, thereby ensuring that when the electrode adapter 10 is overcurrent, the fuse portion 131 can be blown and the purpose of protecting the battery cell is successfully achieved.

[0083] Reference Figures 3 to 5 As shown, in some embodiments of the battery cell of the present invention, the top cover assembly also includes a snap ring 60, which is arranged on a side of the first insulating member 30 close to the top cover sheet 40, penetrates the second mounting hole 31, and is arranged around the pole 20; wherein the snap ring 60 is snapped with the inner wall of the second mounting hole 31, one side of the snap ring 60 in the first direction abuts against the extension portion 23, and the other side of the snap ring 60 in the first direction contacts the side of the top cover sheet 40 facing the first insulating member 30.

[0084] Specifically, the snap ring 60 includes a snap ring body and a snap ring protrusion protruding outward from the outer periphery of the snap ring body. The inner wall of the second mounting hole 31 is provided with a clamping groove, and the snap ring protrusion is clamped with the clamping groove.

[0085] One side of the snap ring 60 in the first direction abuts against the extension portion 23, and the other side of the snap ring 60 in the first direction contacts the side of the top cover sheet 40 facing the first insulating member 30. On the one hand, the snap ring 60 can serve as an insulating pole 20 and the top cover sheet 40; on the other hand, the first insulating member 30 is fixed to the top cover sheet 40 through the pole 20. If there is no snap ring 60, the first insulating member 30 and the top cover sheet 40 cannot be fixedly connected.

[0086] Specifically, the aperture of the second mounting hole 31 at one end close to the top cover sheet 40 along the first direction is larger than the pole extension portion 23, so the pole 20 can be installed in the mounting hole. The end of the second mounting hole 31 along the first direction away from the top cover sheet 40 is smaller than the size of the extension portion 23 due to the provision of the support portion 33, and the pole 20 cannot be installed therein; when the pole 20 is installed in the second mounting hole 31, the retaining ring 60 is assembled on the inner wall of the second mounting hole 31, and the side of the retaining ring 60 away from the top cover sheet contacts the extension portion 23.

[0087] Reference Figures 3 to 5 As shown, in some embodiments of the battery cell of the present invention, the top cover assembly also includes a sealing ring 50, which is sleeved on the outside of the pole 20 and abuts the extension portion 23, and the sealing ring 50 is located in the inner circle of the clamping ring 60. The sealing ring 50 is sealed and connected to the top cover sheet 40 on one side facing the first insulating member 30.

[0088] The sealing ring 50 abuts against the extension portion 23 , and the sealing ring 50 is sealed and connected to a side of the top cover sheet 40 facing the first insulating member 30 . The sealing ring 50 plays a role in sealing and connecting the extension portion 23 and the top cover sheet 40 .

[0089] Reference Figures 3 to 5 As shown, in some embodiments of the battery cell of the present invention, the top cover assembly also includes a second insulating member 70, which is sleeved on the pole 20 along the first direction and pressed on the side of the top cover sheet 40 away from the first insulating member 30, and a partial area of ​​the second insulating member 70 fills the gap between the pole 20 and the top cover sheet 40.

[0090] The second insulating member 70 is sleeved on the pole 20 to fix and insulate the pole 20 and the top cover sheet 40. Specifically, the size of the end of the pole away from the extension 23 is smaller than the first mounting hole, and the size of the extension is larger than the first mounting hole, so that the pole can be inserted into the first mounting hole. Part of the second insulating member 70 fills the gap between the pole 20 and the top cover sheet 40 and extends to the side surface of the top cover sheet away from the extension 23, so that the pole 20 can be fixedly connected to the top cover sheet 40. Optionally, a groove is provided on the side wall of the pole 20, and the second insulating member 70 can be embedded in the groove to enhance the connection effect.

[0091] The assembly process of the top cover assembly in this embodiment is as follows: first, the sealing ring 50 is sleeved on the outer side of the pole 20; then the pole 20 with the sealing ring 50 sleeved is placed in the second mounting hole 31 of the first insulating member 30; then, the snap ring protrusion of the snap ring 60 is snapped into the slot of the first insulating member 30, so that one side of the snap ring 60 in the first direction abuts against the extension 23, and the other side of the snap ring 60 in the first direction contacts the side of the top cover sheet 40 facing the first insulating member 30; then, the end of the pole 2 away from the extension is passed through the first mounting hole, and the top cover sheet 40 and the first insulating member 30 are attached and pressed onto the sealing ring 50, so that the sealing ring 50 reaches the designed compression rate and achieves sealing; finally, the second insulating member 70 is formed by injection molding, so that a partial area of ​​the second insulating member 70 fills the gap between the pole 20 and the top cover sheet 40 and covers the surface of the top cover sheet 40.

[0092] Reference Figure 5 As shown, in some embodiments of the battery cell of the present invention, the electrode adapter 10 has a set height before assembly, and the set height is determined based on the following formula:

[0093]

[0094] Among them, h represents the height of the electrode adapter 10 before assembly; a represents the depth of the accommodating groove 21; b represents the thickness of the supporting portion 33; c represents the thickness of the pole connecting portion 11; d represents the thickness of the pole ear connecting portion 12; e represents the thickness of the bending portion 13; and f represents the groove width of the accommodating groove 21 along the first direction.

[0095] The height of the electrode adapter 10 before assembly can be calculated through the determined values ​​represented by the above-mentioned a, b, c, d, e, and f, so that the electrode adapter 10 can be accurately processed, thereby ensuring that the electrode adapter 10 can be accurately assembled in the subsequent assembly process.

[0096] Reference Figures 10 to 11As shown, the pole 20 includes a pole body 22 and a conductive block 24. The conductive block 24 plays a role of conducting electricity. A snap-fit ​​groove 241 is provided on the conductive block 24. The pole body 22 is accommodated in the snap-fit ​​groove 241 and assembled therewith. The receiving groove 21 is provided in the pole body 22. The notch edge of the receiving groove 21 is turned outward to form an extension portion 23. Part of the second insulating member 70 fills the gap between the conductive block 24 and the top cover sheet 40. Specifically, a groove 25 is provided on the periphery of the conductive block 24, and a portion of the second insulating member 70 is embedded in the groove 25.

[0097] Reference Figure 1 As shown, the battery cell further includes a shell 100 , in which the battery cell 80 is accommodated, and the top cover assembly encapsulates the shell 100 . The shell 100 is made of aluminum, and the shell 100 plays a role in protecting the battery cell 80 .

[0098] Reference Figure 1 As shown, two poles 20 are arranged on the top cover assembly, one is a positive pole and the other is a negative pole; two pole ears 90 are led out from the end surface of the battery cell 80 toward the top cover assembly, one is a positive pole ear and the other is a negative pole ear; the positive pole column is connected to the positive pole ear through the electrode adapter 10, and the negative pole column is connected to the negative pole ear through the electrode adapter 10; wherein, the fuse part 13 may not be arranged on the bending part 13 of one electrode adapter 10, and only the fuse part 13 on the bending part 13 of the other electrode adapter 10 is used as the circuit breaker.

[0099] The embodiment of the present invention further discloses an electric device, including the above-mentioned battery cell. Since the electric device includes the battery cell, it has the same technical effect as the above-mentioned battery cell, which will not be described in detail here.

[0100] Obviously, the above embodiments are merely examples for clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the protection scope of the invention.

Claims

1. A battery cell, characterized in that: include: A top cover assembly, on which a pole (20) is arranged; A battery cell (80) is arranged on one side of the top cover assembly along a first direction, and a pole lug (90) is extended from the end surface of the battery cell (80) toward the top cover assembly; and An electrode adapter (10) is arranged between the battery cell (80) and the top cover assembly along the first direction and is used to connect the pole (20) and the pole lug (90); the electrode adapter (10) comprises a pole connecting portion (11) extending along a second direction, a bent portion (13) formed by bending from one end of the pole connecting portion (11) toward the pole lug (90), and a pole lug connecting portion (12) connected to the bent end of the bent portion (13), wherein the second direction is perpendicular to the first direction; Wherein, a fuse part (131) is provided on the bending part (13), and the cross-sectional area of ​​the region where the fuse part (131) is located is smaller than the cross-sectional area of ​​the non-fuse region on the bending part (13).

2. A battery cell according to claim 1, characterized in that: The bending portion (13) is configured to be deformable during assembly, and the electrode adapter (10) has at least a first state before the bending portion (13) is assembled, and has at least a second state after the bending portion (13) is assembled: When the electrode adapter (10) is in the first state, the bent portion (13) is perpendicular to the pole connecting portion (11) and the pole lug connecting portion (12), and the pole connecting portion (11) and the pole lug connecting portion (12) are staggered along the second direction; When the electrode adapter (10) is in the second state, the bent portion (13) is connected to the pole connecting portion (11) and the pole lug connecting portion (12) at an acute angle, and the projections of the pole connecting portion (11), the pole lug connecting portion (12) and the bent portion (13) along the first direction at least partially overlap.

3. A battery cell according to claim 1 or 2, characterized in that: The pole (20) is provided with a receiving groove (21) on the side facing the electrode adapter (10), and the electrode adapter (10) is assembled into the receiving groove (21); wherein the pole connecting portion (11) and at least a part of the bent portion (13) are accommodated in the receiving groove (21), and the pole connecting portion (11) is closely connected to the bottom of the receiving groove (21), and the pole lug connecting portion (12) is exposed outside the receiving groove (21).

4. A battery cell according to claim 3, characterized in that: An extension portion (23) is formed on the outwardly turned edge of the slot opening of the accommodation slot (21), and an insulating gap is provided between the tab connection portion (12) and the extension portion (23).

5. A battery cell according to claim 4, characterized in that: The top cover assembly comprises: a top cover sheet (40) having a first mounting hole thereon; and a first insulating member (30) which is arranged on one side of the top cover sheet (40) along the first direction and is located between the top cover sheet (40) and the battery cell (80); the first insulating member (30) is provided with a second mounting hole (31) and an adapter via hole (32) which are interconnected, and a support portion (33) is extended from the connection between the second mounting hole (31) and the adapter via hole (32) toward the center of the second mounting hole (31), and the support portion (33) is penetrated in the insulating gap; the first mounting hole, the second mounting hole (31) and the adapter via hole (32) are sequentially distributed along the first direction and are coaxially arranged; The pole (20) is assembled into the second mounting hole (31), and the support portion (33) supports the extension portion (23) and is closely connected thereto; a portion of the pole (20) is also inserted into the first mounting hole for assembly; The pole lug connection portion (12) is exposed to the outside of the adapter through hole (32), and the side of the pole lug connection portion (12) facing the pole (20) abuts against the support portion (33).

6. A battery cell according to claim 5, characterized in that: The top cover assembly also includes a snap ring (60), which is inserted into the second mounting hole (31) and arranged around the pole (20); wherein the snap ring (60) is snap-engaged with the inner wall of the second mounting hole (31), one side of the snap ring (60) in the first direction abuts against the extension portion (23), and the other side of the snap ring (60) in the first direction contacts the side of the top cover sheet (40) facing the first insulating member (30).

7. A battery cell according to claim 6, characterized in that: The top cover assembly also includes a sealing ring (50), which is sleeved outside the pole (20) and abuts against the extension portion (23), and the sealing ring (50) is located in the inner ring of the clamping ring (60). The sealing ring (50) is sealed and connected to a side of the top cover sheet (40) facing the first insulating member (30).

8. A battery cell according to claim 6, characterized in that: The top cover assembly further comprises a second insulating member (70), the second insulating member (70) being sleeved on the pole (20) along the first direction and pressed against a side of the top cover sheet (40) facing away from the first insulating member (30), and a partial area of ​​the second insulating member (70) filling a gap between the pole (20) and the top cover (40).

9. A battery cell according to claim 5, characterized in that: The electrode adapter (10) has a set height before assembly, and the set height is determined based on the following formula: Wherein, h represents the height of the electrode adapter sheet (10) before assembly; a represents the depth of the receiving groove (21); b represents the thickness of the support portion (33); c represents the thickness of the pole connecting portion (11); d represents the thickness of the pole ear connecting portion (12); e represents the thickness of the bending portion (13); and f represents the groove width of the receiving groove (21) along the first direction.

10. An electrical device, characterized in that: The invention comprises the battery cell as claimed in claims 1 to 9.

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