Upper cover assembly and battery

Abstract

The utility model provides an upper cover assembly and a battery. The battery comprises a shell, the pole piece assembly is arranged in the shell, and the pole piece assembly comprises a pole piece; the cover plate is connected to one end of the shell so as to cover the pole piece assembly; the first insulation part is arranged on the inner side of the cover plate, the first insulation part comprises a bottom wall and a side wall connected to the bottom wall, the bottom wall is arranged close to the top end face of the pole piece, and the side wall extends towards one side of the cover plate and abuts against the cover plate.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to an upper cover assembly and a battery. Background Art

[0002] Active implant neurostimulators, the main product types currently include vagus nerve stimulator (VNS), deep brain nerve stimulator (DBS), spinal nerve stimulator (SCS), pubic nerve stimulator (SNS), etc. Among them, DBS and SCS mostly use secondary lithium-ion batteries. As the core power component of the neurostimulator, the structural stability of the battery is crucial to the normal operation of the active implant neurostimulator.

[0003] In the related art, the above-mentioned battery includes a shell, a pole piece assembly and an upper cover assembly connected to one end of the shell, and the upper cover assembly further includes structures such as a cover plate, a pole post, an insulating member and a connecting plate. The pole ear at the end of the pole piece assembly is electrically connected to the pole post through the connecting plate. When the active implant neural stimulator is implanted in the human body and used, the battery will vibrate as the human body moves, which can easily cause the pole piece assembly inside the battery to loosen, thereby destroying the electrical connection between the connecting plate and at least part of the pole ear of the pole piece assembly, thereby affecting the stability of the electrical connection structure inside the battery. Utility Model Content

[0004] The embodiments of the utility model provide a top cover assembly and a battery, which can improve the technical problem that the pole piece assembly inside the battery is easy to loosen.

[0005] In a first aspect, an embodiment of the present utility model provides a battery, the battery comprising:

[0006] case;

[0007] A pole piece assembly, the pole piece assembly is arranged inside the housing, and the pole piece assembly includes a pole piece;

[0008] A cover plate, the cover plate being connected to one end of the housing to cover the pole piece assembly;

[0009] A first insulating member, the first insulating member is arranged on the inner side of the cover plate, the first insulating member includes a bottom wall and a side wall connected to the bottom wall, the bottom wall is arranged close to the top end surface of the pole piece, and the side wall is constructed to extend toward one side of the cover plate and abut against the cover plate.

[0010] In one embodiment, the side wall and the bottom wall enclose a first cavity, and the height of the first cavity is set to 2.5 mm to 4.0 mm.

[0011] In one embodiment, the battery further includes a first electrode and a connecting plate, the first electrode includes a positive electrode or a negative electrode, the electrode plate assembly includes a first pole ear, the connecting plate is used to electrically connect the first pole ear with the first electrode, and a perforation is provided on the bottom wall, and the perforation is used for the first pole ear to pass through.

[0012] In one embodiment, the length of the through hole is greater than the width of the first electrode tab; and / or the ratio of the width of the through hole to the thickness of the first electrode tab is greater than 2.

[0013] In one embodiment, the top end of the first pole extends to the outside of the cover plate, the first pole extends into the first cavity, and a gap is provided between the end of the first pole and the bottom wall.

[0014] In one embodiment, the interval is set to 0.2 mm to 1.0 mm.

[0015] In one embodiment, a liquid conducting hole is further provided on the bottom wall, and the liquid conducting hole is spaced apart from the through hole.

[0016] In one embodiment, the battery further includes a second insulating member disposed between the cover plate and the connecting sheet, and the second insulating member is disposed inside the first cavity.

[0017] In one embodiment, the second insulating member includes a protrusion extending toward the bottom wall, the connecting piece is provided with a positioning hole, and the protrusion is provided through the positioning hole.

[0018] In one embodiment, the battery further includes a liquid injection hole column connected to the cover plate, the liquid injection hole column extends into the interior of the first cavity, one side of the second insulating member abuts against the side wall, and the other side of the second insulating member abuts against the liquid injection hole column.

[0019] In one embodiment, the pole piece assembly includes a second pole tab, which is disposed on the outer side of the first insulating member, and the second pole tab is welded in a gap between the cover plate and the shell.

[0020] In one embodiment, the pole piece assembly includes a second pole ear, the first insulating member is provided with an avoidance portion, the avoidance portion defines an opening for the second pole ear to pass through, and the second pole ear passes through the opening and is electrically connected to the cover plate.

[0021] In one embodiment, the avoidance portion is configured to be formed by a concave portion of the first insulating member.

[0022] In one embodiment, the first insulating member is provided with a first cavity, and the battery further comprises a second insulating member disposed in the first cavity, one side of the second insulating member abuts against the side wall, and the other side of the second insulating member is provided with a notch, and the notch is disposed corresponding to the avoidance portion.

[0023] In one embodiment, the cover plate is provided with a first hole, and the battery further includes a liquid injection hole column, which extends through the first hole to the interior of the first cavity, and the liquid injection hole column is used to seal a portion of the first hole. The battery further includes a second pole, and the second pole is used to seal another portion of the first hole.

[0024] In a second aspect, an embodiment of the utility model provides an upper cover assembly, the upper cover assembly comprising:

[0025] Cover plate;

[0026] A first insulating member, the first insulating member is arranged on the inner side of the cover plate, the first insulating member includes a bottom wall and a side wall connected to the bottom wall, the bottom wall is arranged close to the top end surface of the pole piece, and the side wall is constructed to extend toward one side of the cover plate and abut against the cover plate.

[0027] Beneficial effects of the embodiments of the utility model:

[0028] In an embodiment of the utility model, the first insulating member includes a bottom wall and a side wall connected to the bottom wall, wherein the side wall is configured to extend toward one side of the cover plate and abut against the cover plate, and the bottom wall is arranged close to the top end surface of the pole piece. Since the bottom wall of the first insulating member is arranged close to the top end surface of the pole piece, the pole piece assembly will abut against the bottom wall of the first insulating member when subjected to vibration. Furthermore, since the side wall of the first insulating member abuts against the cover plate, the side wall of the first insulating member further limits the pole piece assembly from vibrating significantly inside the battery, thereby allowing the pole piece assembly to be stably maintained inside the battery, thereby effectively improving the technical problem of the pole piece assembly being easily loosened. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 It is a three-dimensional schematic diagram of a battery provided in the first embodiment of the utility model;

[0031] Figure 2 This is an exploded view of a battery provided in Embodiment 1 of the present utility model;

[0032] Figure 3 is a cross-sectional view of a battery provided in Embodiment 1 of the present utility model;

[0033] Figure 4a It is a three-dimensional diagram of a first insulating member provided in the first embodiment of the present utility model from one viewing angle;

[0034] Figure 4b is a three-dimensional diagram of the first insulating member provided in the first embodiment of the present utility model from another viewing angle;

[0035] Figure 5a It is a three-dimensional diagram of a second insulating member provided in the first embodiment of the present utility model from one viewing angle;

[0036] Figure 5b is a three-dimensional diagram of the second insulating member provided in the first embodiment of the present utility model from another viewing angle;

[0037] Figure 6 is a cross-sectional view of the upper cover assembly provided in the first embodiment of the present utility model;

[0038] Figure 7 yes Figure 6 A partial enlarged view of

[0039] Figure 8 is a three-dimensional diagram of a connecting piece provided by an embodiment of the utility model;

[0040] Fig. 9 is a three-dimensional diagram of a battery provided in the second embodiment of the present utility model;

[0041] Fig.10 This is an exploded view of a battery provided in Embodiment 2 of the present utility model;

[0042] Fig.11 is a cross-sectional view of a battery provided in Embodiment 2 of the present utility model;

[0043] Fig.12a It is a three-dimensional diagram of a first insulating member provided in the second embodiment of the present utility model from one viewing angle;

[0044] Figure 12b is a three-dimensional diagram of the first insulating member provided in the second embodiment of the present utility model from another viewing angle;

[0045] Fig.13a It is a three-dimensional diagram of a second insulating member provided in the second embodiment of the present utility model from one viewing angle;

[0046] Fig.13b is a three-dimensional diagram of the second insulating member provided in the second embodiment of the present utility model from another viewing angle;

[0047] Figure Number:

[0048] 100, battery; 10, shell; 11, bottom plate; 12, insulating film; 20, upper cover assembly; 21, cover plate; 211, first hole; 22, bottom plate; 30, pole piece assembly; 31, pole piece; 311, top surface of pole piece; 32, first pole ear; 33, second pole ear; 40, first insulating member; 41, bottom wall; 42, side wall; 43, first cavity; 44, perforation; 45, liquid guide hole; 46, avoidance portion; 47, opening; 50, second insulating member; 51, protrusion; 52, inner hole; 53, protrusion; 54, notch; 61, first pole column; 62, second pole column;

[0049] 70, connecting piece; 71, first section; 72, second section; 73, third section; 74, positioning hole;

[0050] 80, injection hole column; 81, main body; 82, boss portion; 83, injection hole; 84, sealing rubber particles;

[0051] 85. Sealing nails; DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model. In the utility model, unless otherwise stated, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0053] Active implantable neurostimulators, the main product types currently include vagus nerve stimulator (VNS), deep brain nerve stimulator (DBS), spinal nerve stimulator (SCS), pubic nerve stimulator (SNS), etc. Among them, DBS and SCS mostly use secondary lithium-ion batteries. As the core power component of the neurostimulator, the structural stability of the battery is crucial to the stability of the active implantable neurostimulator.

[0054] In the related art, the above-mentioned battery includes a shell, a pole piece assembly and an upper cover assembly connected to one end of the shell, and the upper cover assembly further includes structures such as a cover plate, a pole post, an insulating member and a connecting plate. The pole ear at the end of the pole piece assembly is electrically connected to the pole post through the connecting plate. When the active implant neural stimulator is implanted in the human body and used, the battery will vibrate as the human body moves, which can easily cause the pole piece assembly inside the battery to loosen, thereby destroying the electrical connection between the connecting plate and at least part of the pole ear of the pole piece assembly, thereby affecting the stability of the electrical connection structure inside the battery.

[0055] An embodiment of the utility model provides a battery, which optimizes the structure of the upper cover assembly of the battery so that the pole piece assembly can be stably maintained inside the shell, thereby improving the stability of the electrical connection structure inside the battery.

[0056] refer to Figures 1 to 8 As shown, the battery 100 includes a shell 10 , an upper cover assembly 20 and a pole piece assembly 30 . The pole piece assembly 30 is disposed inside the shell 10 , and the upper cover assembly 20 is connected to the open end of the shell 10 .

[0057] The electrode assembly 30 includes an electrode 31 and a separator. The electrode 31 includes a positive electrode and a negative electrode. The separator is used to separate the positive electrode and the negative electrode. Figure 2 and Figure 3 As shown, the pole piece assembly 30 is constructed as a winding core structure, and the positive pole piece, the separator and the negative pole piece are stacked in sequence and then wound layer by layer with the height direction of the shell 10 as the axial direction. In other optional examples, the pole piece assembly 30 can be set to a stacked structure, and the positive pole piece, the separator and the negative pole piece are stacked in sequence and then stacked along the height direction of the shell 10.

[0058] The end of the positive electrode plate is not coated with positive active material to form a positive electrode tab, and the end of the negative electrode plate is not coated with negative active material to form a negative electrode tab. The positive electrode tab is further electrically connected to the positive output terminal of the battery 100, and the negative electrode tab is further electrically connected to the negative output terminal of the battery 100.

[0059] Further references Figure 2 and Figure 3 As shown, the housing 10 includes a top end and a bottom end that are relatively arranged, wherein the top end and the bottom end are both arranged as open ends, the top end opening is connected to the upper cover assembly 20, the bottom end opening is connected to the bottom plate 11, the top end surface 311 of the pole piece 31 is arranged close to the upper cover assembly 20, the bottom end surface of the pole piece 31 is arranged close to the bottom plate 11, and an insulating film 12 is further arranged between the pole piece assembly 30 and the bottom plate 11. In other optional examples, the top end of the housing 10 is arranged as an open end, and the bottom end of the housing 10 is arranged as a closed end.

[0060] like Figure 2 , Figure 3 as well as Figure 6 As shown, the upper cover assembly 20 of the battery 100 further includes a cover plate 21 and a first insulating member 40, and the cover plate 21 is connected to the top opening of the shell 10 to cover the pole piece assembly 30, wherein the connection between the cover plate 21 and the shell 10 is preferably welding.

[0061] The cover plate 21 is arranged on the top opening of the shell 10, and the length of the cover plate 21 is set to be able to fit with the length dimension of the inner cavity of the shell 10 through clearance, and the width of the cover plate 21 is set to be able to fit with the width of the inner cavity of the shell 10 through interference, so that the cover plate 21 can be stably connected to the shell 10, wherein the length of the inner cavity of the shell 10 is set to be the length extending along its length direction, and the width of the inner cavity of the shell 10 is set to be the width extending along its thickness direction.

[0062] The material of the shell 10 of the battery 100 suitable for use in the active implant neural stimulator needs to meet the characteristics of non-magnetic, good biocompatibility, low density and high strength. The shell 10 is mostly made of stainless steel, titanium or titanium alloy, among which suitable stainless steel includes SUS304, suitable titanium includes TA1 and TA2, and suitable titanium alloy includes TC4. When the material of the shell 10 is SUS304, TA1 or TA2, the shell 10 is formed by multiple annealing, stamping and stretching. When the material of the shell 10 is TC4, the shell 10 is mostly formed by precision machining. The wall thickness of the shell 10 is 0.3mm~0.4mm.

[0063] The material suitable for making the cover plate 21 includes at least one of stainless steel, titanium and titanium alloy, wherein suitable stainless steel materials include SUS304, suitable titanium materials include TA1 and TA2, and suitable titanium alloys include TC4. The thickness of the cover plate 21 is 0.8 mm to 1.0 mm.

[0064] Taking the square battery 100 as an example, the size of the battery 100 suitable for use in an active implant neurostimulator is defined by the shell 10, wherein the length of the shell 10 is set to 15mm~25mm, the thickness of the shell 10 is set to 3.5mm~7mm, and the height of the shell 10 is set to 15mm~40mm, wherein the specific size of the shell 10 can be customized according to the size of the power cavity of the neurostimulator.

[0065] Further references Figure 2 and Figure 3 As shown, the first insulating member 40 is arranged on the inner side of the cover plate 21, and the first insulating member 40 includes a bottom wall 41 and a side wall 42 connected to the bottom wall 41, the bottom wall 41 is arranged close to the top end surface 311 of the pole piece assembly 30, and the side wall 42 is constructed to extend toward one side of the cover plate 21 and abut against the cover plate 21.

[0066] As the human body moves, the battery 100 will vibrate. Since the bottom wall 41 of the first insulating member 40 is arranged close to the top surface 311 of the pole piece 31, the pole piece assembly 30 will abut against the bottom wall 41 of the first insulating member 40 when vibrated. Furthermore, since the side wall 42 of the first insulating member 40 abuts against the cover plate 21, the first insulating member 40 further limits the pole piece assembly 30 from vibrating significantly inside the battery 100, thereby stably maintaining the pole piece assembly 30 inside the battery 100, thereby effectively improving the technical problem of the pole piece assembly 30 being easily loosened.

[0067] The bottom wall 41 of the first insulating member 40 is arranged close to the top end surface 311 of the pole piece assembly 30. It can be understood that the interval between the first insulating member 40 and the top end surface 311 of the pole piece assembly 30 is very small, or the bottom wall 41 of the first insulating member 40 is infinitely close to the top end surface 311 of the pole piece assembly 30, so that the bottom wall 41 of the first insulating member 40 abuts against the top end surface 311 of the pole piece assembly 30.

[0068] Further references Figure 2 and Figure 3 As shown, the projection surface of the bottom wall 41 of the first insulating member 40 on the top surface 311 of the pole piece assembly 30 can basically cover the top surface 311 of the pole piece assembly 30, so that the top surface 311 of the pole piece assembly 30 can completely abut against the bottom wall 41 of the first insulating member 40 during vibration, thereby further improving the stability of the fixation of the pole piece assembly 30 inside the battery 100. In a preferred embodiment, the side wall 42 and the bottom wall 41 enclose a first cavity 43, and the height of the first cavity 43 is set to 2.5mm to 4.0mm.

[0069] After research, the inventors found that when the height of the shell 10 is set to 15mm~40mm, the height of the first cavity 43 defined by the first insulating member 40 is preferably set to 2.5mm~4.0mm, wherein, under the premise of meeting the height requirement of the pole piece assembly 30 inside the shell 10, when the height of the shell 10 increases, the height of the first cavity 43 defined by the first insulating member 40 can be appropriately increased. Specifically, the height of the first cavity 43 can be 2.8mm, 3.0mm, 3.2mm, 3.4mm, 3.6mm, 3.8mm, and a value between any two of the above values ​​or a range between any two of the above values.

[0070] The bottom wall 41 of the first insulating member 40 is arranged close to the top end surface 311 of the pole piece assembly 30, and the side wall 42 of the first insulating member 40 abuts against the cover plate 21, so that the height of the first cavity 43 of the first insulating member 40 is set to the difference between the height of the shell 10 and the height of the pole piece assembly 30, and a positive pole ear and / or a negative pole ear are arranged at the end of the pole piece assembly 30, and the positive pole ear is electrically connected to the positive output terminal of the battery 100, and the negative pole ear is electrically connected to the negative output terminal of the battery 100. When the height of the first cavity 43 is less than 2.5 mm, it is impossible to further set the positive output terminal and / or the negative output terminal and the insulating member inside the first cavity 43. When the height of the first cavity 43 is greater than 4.0 mm, when the height of the pole piece assembly 30 remains constant, the height response of the shell 10 increases accordingly, which is not conducive to the miniaturized design of the battery 100. The size of the battery 100 cavity of the active implant neurostimulator is limited. Therefore, under the premise of meeting the capacity of the battery 100, the height of the first cavity 43 is preferably set to 2.5 mm to 4.0 mm.

[0071] Further references Figure 2 , Figure 3 , Figure 4a , Figure 4b , Figure 5a , Figure 5b , Figure 6 as well as Figure 8 As shown, the upper cover assembly 20 also includes a first pole 61 and a connecting plate 70, the pole piece assembly 30 includes a first pole ear 32, the connecting plate 70 is used to electrically connect the first pole ear 32 with the first pole 61, and a through hole 44 is provided on the bottom wall 41, and the through hole 44 is used for the first pole ear 32 to pass through.

[0072] Compared with the prior art, the first pole lug 32 is directly welded to the first pole 61 by resistance welding, and the diameter of the first pole 61 is generally set to 0.5mm-3mm. Due to the small diameter of the first pole 61, the welding area between the first pole lug 32 and the first pole 61 is small, so that at least a part of the first pole lug 32 and the first pole 61 forms a virtual weld, so that the part of the first pole lug 32 and the first pole 61 cannot form a stable electrical connection, thereby affecting the stability of the capacity of the battery 100. Furthermore, the first pole 61 is usually made of molybdenum, which is a refractory metal material, thereby resulting in low welding strength between the first pole lug 32 and the first pole 61, and the welding point formed between the first pole lug 32 and the first pole 61 is easy to fall off, thereby causing an internal short circuit in the battery 100, and further causing the battery 100 to fail in the patient's body, causing the patient's pain.

[0073] In the embodiment of the utility model, a connecting piece 70 is added between the first pole 61 and the first pole ear 32. The connecting piece 70 is preferably made of a fusible metal material. Suitable metal materials include pure aluminum, stainless steel, low carbon steel, titanium, etc. The connecting piece 70 is connected to the first pole 61 by laser welding, thereby enhancing the welding strength between the connecting piece 70 and the first pole 61, and improving the stability of the electrical connection between the first pole 61 and the connecting piece 70. Further, since the connecting piece 70 is made of a fusible metal material, the first pole ear 32 can also be stably welded to the connecting piece 70 by resistance welding. In addition, the connecting piece 70 can increase its width or length based on the need for welding strength with the first pole ear 32, so that the first pole ear 32 can be stably welded to the connecting piece 70, thereby improving the stability of the electrical connection structure inside the battery 100.

[0074] The above-mentioned first pole 61 includes a positive pole or a negative pole. When the first pole 61 is set as a positive pole, the first pole ear 32 is set as a positive pole. When the first pole 61 is set as a negative pole, the first pole ear 32 is set as a negative pole. A through hole 44 is set on the bottom wall 41, and the first pole ear 32 passes through the through hole 44 and is welded to the connecting plate 70.

[0075] like Figure 2 as well as Figure 8 As shown, the connecting piece 70 includes a first section 71, a second section 72 and a third section 73 which are connected in sequence, wherein one end of the second section 72 is bent and connected to the first section 71, and the other end of the second section 72 is bent and connected to the third section 73. In one example, the first section 71 and the third section 73 are arranged in parallel, one end of the second section 72 is vertically connected to the end of the first section 71, and the other end of the second section 72 is vertically connected to one end of the third section 73.

[0076] A connecting hole is provided on the first section 71, and the connecting hole is configured to allow the first pole 61 to pass through and electrically connect the first pole 61 to the connecting piece 70, wherein the first pole 61 and the connecting piece 70 are preferably connected by welding. Further, the first pole tab 32 is welded to the third section 73 of the connecting piece 70.

[0077] like Figure 4a and Figure 4bAs shown, a through hole 44 for the first pole ear 32 to pass through is provided on the bottom wall 41 of the first insulating member 40, and the through hole 44 is arranged in a racetrack shape. In a preferred embodiment, the length L of the through hole 44 is 5 mm to 8 mm; and / or the width d of the through hole 44 is 0.3 mm to 0.6 mm. The length L of the through hole 44 can be 5 mm, 6 mm, 7 mm, 8 mm, or a value between any two of the above values, or a range between any two of the above values, and the width d of the through hole 44 can be 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, or a value between any two of the above values, or a range between any two of the above values.

[0078] In some implementations, the length of the through hole 44 is greater than the width of the first tab 32, and / or the ratio of the width of the through hole 44 to the thickness of the first tab 32 is greater than 2.

[0079] Taking the first pole ear 32 as an example, the thickness of the positive pole ear is usually set to 0.1mm-0.3mm, and the width of the positive pole ear is usually set to 1.5mm-3.0mm. The inventor has found through research that when the length of the perforation 44 is set to be greater than the width of the positive pole ear, and the width of the perforation 44 is set to be greater than 2 times the thickness of the positive pole ear, it is convenient for the positive pole ear to pass through the perforation 44 and be welded on the connecting piece 70. When the length of the perforation 44 is less than 5.0mm, or when the width of the perforation 44 is less than 0.3mm, it is not convenient for the positive pole ear to pass through the perforation 44. When the length of the perforation 44 is greater than 8mm, or the width of the perforation 44 is greater than 0.6mm, when the area of ​​the bottom wall 41 of the first insulating member 40 is constant, the size of the perforation 44 is too large, which is not conducive to maintaining the rigidity of the bottom wall 41 of the first insulating member 40, thereby weakening the limiting effect of the bottom wall 41 of the first insulating member 40 on the pole piece assembly 30.

[0080] The top end of the first pole 61 extends to the outside of the cover plate 21 , the end of the first pole 61 extends into the first cavity 43 , and a gap is provided between the end of the first pole 61 and the bottom wall 41 of the first insulating member 40 .

[0081] By arranging the above-mentioned connecting piece 70 in the inner cavity of the first insulating member 40, the top end of the first pole 61 extends to the outside of the cover plate 21, so as to facilitate the electrical connection between the positive output terminal or the negative output terminal of the battery 100 and the outside, the end of the first pole 61 extends into the inner cavity of the first insulating member 40 and a gap is arranged between the end of the first pole 61 and the bottom wall 41 of the first insulating member 40, so that the welding position of the connecting piece 70 of the first pole 61 is basically located in the inner cavity of the first insulating member 40, and the welding position of the first pole ear 32 and the connecting piece 70 is also basically located in the first cavity 43 of the first insulating member 40, which is conducive to optimizing the internal structure of the upper cover assembly 20.

[0082] In a further preferred embodiment, the height between the end of the first pole 61 and the bottom wall 41 of the first insulating member 40 is set to be 0.2 mm to 1.0 mm. Figure 3 As shown, the welding position of the first pole 61 and the connecting piece 70 is close to the end of the first pole 61. When the height of the end of the first pole 61 from the bottom wall 41 of the first insulating member 40 is less than 0.2 mm, the laser energy used in the laser welding process of the first pole 61 and the connecting piece 70 may cause thermal corrosion to the bottom wall 41 of the first insulating member 40, resulting in the breakdown of the bottom wall 41 of the first insulating member 40 at the corresponding position below. When the pole piece assembly 30 is vibrated, it will further contact with the first pole 61, thereby causing the battery 100 to short-circuit. When the height of the end of the first pole 61 from the bottom wall 41 of the first insulating member 40 is set to be greater than 1.0 mm, the height of the inner cavity of the first insulating member 40 will be further increased, thereby increasing the proportion of the height of the inner cavity of the first insulating member 40 to the height of the inner cavity of the shell 10, which is not conducive to the miniaturization design and high capacity ratio design of the battery 100.

[0083] Further references Figure 2 , Figure 3 , Figure 4a , Figure 4b , Figure 6 and Figure 7 As shown, a liquid injection structure is also provided on the upper cover assembly 20. Specifically, the liquid injection structure includes a liquid injection hole column 80 connected to the cover plate 21 and a liquid guide hole 45 provided on the bottom wall 41 of the first insulating member 40, wherein the liquid guide hole 45 provided on the bottom wall 41 of the first insulating member 40 is spaced apart from the through hole 44.

[0084] The injection hole column 80 is provided with an injection hole 83 , which is connected to the first cavity 43 of the first insulating member 40 . The electrolyte is injected into the first cavity 43 through the injection hole 83 and further enters the pole piece assembly 30 through the liquid guide hole 45 provided on the bottom wall 41 .

[0085] A plurality of liquid guide holes 45 are spaced apart on the bottom wall 41. Furthermore, since the ratio of the width of the through-hole 44 to the thickness of the first pole ear 32 is greater than 2, the length of the through-hole 44 is greater than the width of the first pole ear 32. Thus, the first pole ear 32 passes through the through-hole 44. A gap is formed between the first pole ear 32 and the inner wall defining the through-hole 44. The electrolyte can also enter the pole piece assembly 30 through the gap.

[0086] Further references Figure 6 and Figure 7 As shown, the injection hole column 80 can be set to a cylindrical shape or a square column shape. The cylindrical injection hole column 80 is used as an example for explanation. The above-mentioned injection hole column 80 is set to a sink cylindrical shape. The outer diameter of the injection hole column 80 is set to 3.0mm~4.5mm, and the overall height of the injection hole column 80 is set to 1.0mm~2.5mm. The injection hole column 80 includes a main body 81 and a boss portion 82 with different outer diameters, wherein the outer diameter of the boss portion 82 is larger than the outer diameter of the main body 81, and the outer diameter of the boss portion 82 is 0.5mm~1.0mm larger than the outer diameter of the main body 81. The height of the boss is preferably set to 0.35mm~0.5mm.

[0087] The boss portion 82 is disposed on the inner side of the cover plate 21, and a first hole 211 is disposed on the cover plate 21. The main body 81 and the first hole 211 are interference fit or clearance fit. When the main body 81 of the injection hole column 80 and the cover plate 21 are interference fit, the outer diameter of the main body 81 is 0.02 mm greater than the inner diameter of the first hole 211. When the main body 81 of the injection hole column 80 and the cover plate 21 are clearance fit, the outer diameter of the main body 81 is 0.02 mm less than the inner diameter of the first hole 211. The injection hole column 80 is connected to the cover plate 21 by laser welding. When the matching mode of the injection hole column 80 and the cover plate 21 is different, the corresponding welding jigs used between the injection hole column 80 and the cover plate 21 are different.

[0088] The injection hole column 80 is provided with an injection hole 83 , and the electrolyte is injected into the first cavity 43 through the injection hole 83 by the injection pump, and is injected into the pole piece assembly 30 through the liquid guide hole 45 on the bottom wall 41 of the first insulating member 40 .

[0089] like Figure 2 and Figure 3 As shown, the upper cover assembly 20 further includes a sealing rubber particle 84 for sealing the injection hole 83 of the injection hole column 80. The height of the sealing rubber particle 84 is set to 1.0mm to 3.0mm. The sealing rubber particle 84 and the injection hole column 80 are interference fit, and the interference fit amount between the sealing rubber particle 84 and the injection hole column 80 is 0.08mm to 0.15mm. After the injection is completed, the sealing rubber particle 84 is pressed into the injection hole 83 of the injection hole column 80 through the capping process.

[0090] Further references Figure 2 and Figure 3 As shown, the upper cover assembly 20 further includes a sealing nail 85. A portion of the first hole 211 on the cover plate 21 is sealed by the main body 81 of the injection hole column 80, and another portion of the first hole 211 is sealed by the sealing nail 85. The thickness of the sealing nail 85 is set to 0.4mm to 0.6mm. A step surface is formed between the injection hole column 80 and the cover plate 21. After the sealing rubber particles 84 are pressed into the injection hole 83 of the injection hole column 80, the sealing nail 85 is installed in the first hole 211 of the cover plate 21, and the sealing nail 85 abuts against the above-mentioned step surface. Among them, the sealing pin 85 and the cover plate 21 are set to be an interference fit or a clearance fit. In a preferred implementation, the sum of the thickness of the sealing pin 85 and the height of the boss portion 82 of the injection hole column 80 is less than the thickness of the cover plate 21, and the thickness of the cover plate 21 minus the thickness of the sealing pin 85 and the height of the boss portion 82 of the injection hole column 80 is set to 0.05mm~1.0mm, which is beneficial to maintaining the sealing performance of the injection hole structure of the upper cover assembly 20.

[0091] Further references Figure 2 , Figure 3 , Figure 5a and Figure 5b As shown, the upper cover assembly 20 also includes a second insulating member 50, which is arranged between the cover plate 21 and the connecting piece 70 and provides insulation. The second insulating member 50 is connected to the inner side of the cover plate 21, and the second insulating member 50 is arranged inside the first cavity 43.

[0092] Specifically, the second insulating member 50 is disposed inside the first cavity 43 of the first insulating member 40. The first cavity 43 of the first insulating member 40 and the second insulating member 50 can be set to an interference fit or a clearance fit along the width direction thereof. When the first insulating member 40 and the second insulating member 50 are set to an interference fit, the unilateral interference amount of the first insulating member 40 and the second insulating member 50 in the width direction is set to 0.05mm to 0.2mm. When the first insulating member 40 and the second insulating member 50 are set to a clearance fit, in a preferred implementation, the width of the first insulating member 40 is greater than the width of the second insulating member 50, and the difference between the width of the first insulating member 40 and the width of the second insulating member 50 is 0.1mm to 0.3mm, so that the second insulating member 50 can be stably assembled inside the first cavity 43 of the first insulating member 40 without shaking.

[0093] The upper surface of the second insulating member 50 abuts against the inner surface of the cover plate 21 . The second insulating member 50 includes a protruding column 51 . The protruding column 51 is provided with an inner hole 52 . The first pole 61 passes through the cover plate 21 and extends into the first cavity 43 through the inner hole 52 .

[0094] The lower surface of the second insulating member 50 abuts against the third section 73 of the connecting piece 70. Figure 3 , Figure 5a , Figure 5b , Fig.12a and Figure 12b As shown, the second insulating member 50 further includes a protrusion 53 extending toward the bottom wall 41 , and the connecting piece 70 is provided with a positioning hole 74 , and the protrusion 53 is provided through the positioning hole 74 .

[0095] By providing a protrusion 53 on the second insulating member 50 and the protrusion 53 passing through the positioning hole 74 on the connecting piece 70 , the positions of the second insulating member 50 and the connecting piece 70 are kept relatively fixed. Furthermore, the positioning hole 74 is provided on the third section 73 of the connecting piece 70 .

[0096] Further references Figure 3 , Figure 5a and Figure 5b As shown, the boss portion 82 of the injection hole column 80 extends to the inside of the first cavity 43, one side of the second insulating member 50 abuts against the side wall 42, and the other side of the second insulating member 50 abuts against the injection hole column 80, so that the second insulating member 50 abuts between the side wall 42 of the first insulating member 40 and the injection hole column 80 along its length direction. An arc-shaped notch 54 is provided at one end of the second insulating member 50 abutting against the injection hole column 80, so as to facilitate one end of the second insulating member 50 to be clamped on the injection hole column 80.

[0097] Further references Figures 1 to 7 As shown, in an embodiment provided by the utility model, the upper cover assembly 20 includes a first pole 61 and a second pole 62, wherein the first pole 61 is set as a positive pole, the second pole 62 is set as a negative pole, and the negative pole is directly welded to the cover plate 21, and the pole piece assembly 30 includes a first pole ear 32 and a second pole ear 33, the first pole ear 32 is set as a positive pole ear, and the second pole ear 33 is set as a negative pole ear, the positive pole extends to the interior of the first cavity 43 and is welded to the connecting plate 70, the positive pole ear is welded to the connecting plate 70, the negative pole ear is arranged closer to the side of the pole piece assembly 30 relative to the positive pole ear, and the negative pole ear is located on the outside of the first insulating member 40, and further the negative pole ear is welded in the gap between the cover plate 21 and the shell 10, and the negative pole ear is electrically connected to the negative pole via the cover plate 21 and the shell 10.

[0098] Further references Figures 9 to 11 , Fig.12a , Figure 12b , Fig.13a as well as Fig.13bAs shown, in the second embodiment provided by the utility model, the upper cover assembly 20 includes a first pole 61 and a second pole 62, wherein the first pole 61 is set as a positive pole, and the second pole 62 is set as a negative pole, and the negative pole is directly welded on the cover plate 21, and the pole piece assembly 30 includes a first pole ear 32 and a second pole ear 33, wherein the first pole ear 32 is set as a positive pole ear, and the second pole ear 33 is set as a negative pole ear. Different from the above embodiment, the distance between the negative pole ear and the positive pole ear and the center of the pole piece assembly 30 is substantially the same, and the first insulating member 40 is provided with an avoidance portion 46, and the avoidance portion 46 defines an opening 47, and the opening 47 is used for the second pole ear 33 to pass through, and the second pole ear 33 passes through the opening 47 and is electrically connected to the cover plate 21.

[0099] By directly welding the negative electrode tab to the inner side surface of the cover plate 21 , the welding stability between the negative electrode tab and the cover plate 21 can be further improved.

[0100] Further references Fig.12a and Figure 12b As shown, the avoidance portion 46 is configured to be formed by a portion of the bottom wall 41 and the side wall 42 of the first insulating member 40 being recessed, and the liquid guide holes 45 provided on the bottom wall 41 are provided on both sides of the opening 47 .

[0101] By providing the avoidance portion 46 of the concave structure, the negative electrode tab can be directly extended toward the direction close to the cover plate 21 so as to be welded on the cover plate 21 , thereby improving the welding efficiency of the negative electrode tab.

[0102] Further references Fig.13a and Fig.13b As shown, different from the above embodiment, one side of the second insulating member 50 abuts against the side wall 42, and the other side of the second insulating member 50 is provided with an L-shaped notch 54, and the notch 54 is provided corresponding to the avoidance portion 46, so that the second insulating member 50 is along its length direction, one end of the second insulating member 50 abuts against the side wall 42, and the other end of the second insulating member 50 abuts against the avoidance portion 46, so that the second insulating member 50 can be stably fixed inside the first cavity 43.

[0103] Further references Fig.10 As shown, the injection hole column 80 extends through the first hole 211 to the inside of the first cavity 43 , the injection hole column 80 is used to seal a portion of the first hole 211 , and the second pole 62 is used to seal another portion of the first hole 211 .

[0104] The welding position between the second electrode tab 33 and the cover plate 21 is arranged close to the injection hole column 80 , so the sealing pin 85 for sealing the first hole 211 of the cover plate 21 is replaced by the negative electrode column, thereby simplifying the structure of the upper cover assembly 20 .

[0105] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for technicians in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A battery, characterized in that: include: case; A pole piece assembly, the pole piece assembly is arranged inside the housing, and the pole piece assembly includes a pole piece; A cover plate, the cover plate being connected to one end of the housing to cover the pole piece assembly; A first insulating member, the first insulating member is arranged inside the shell and located on the inner side of the cover plate, the first insulating member includes a bottom wall and a side wall connected to the bottom wall, the bottom wall is arranged close to the top end surface of the pole piece, and the side wall is constructed to extend toward one side of the cover plate and abut against the cover plate.

2. The battery according to claim 1, characterized in that The side wall and the bottom wall enclose a first cavity, and the height of the first cavity is set to 2.5 mm to 4.0 mm.

3. The battery according to claim 2, characterized in that The battery further includes a first pole and a connecting plate. The pole plate assembly includes a first pole ear. The connecting plate is used to electrically connect the first pole ear to the first pole. A through hole is provided on the bottom wall, and the through hole is used for the first pole ear to pass through.

4. The battery according to claim 3, characterized in that The length of the through hole is greater than the width of the first electrode tab; and / or the ratio of the width of the through hole to the thickness of the first electrode tab is greater than 2.

5. The battery according to claim 3, characterized in that The top end of the first pole extends to the outside of the cover plate, the end of the first pole extends into the first cavity, and a gap is provided between the end of the first pole and the bottom wall.

6. The battery according to claim 5, characterized in that The interval is set to 0.2 mm to 1.0 mm.

7. The battery according to claim 3, characterized in that The bottom wall is also provided with a liquid conducting hole, and the liquid conducting hole is spaced apart from the perforation.

8. The battery according to claim 3, characterized in that The battery further includes a second insulating member disposed between the cover plate and the connecting plate, the second insulating member is disposed close to the cover plate, the first insulating member is disposed close to the pole piece assembly, and the second insulating member is disposed inside the first cavity.

9. The battery according to claim 8, characterized in that The second insulating member includes a protrusion extending toward the bottom wall, and the connecting piece is provided with a positioning hole, and the positioning hole is used for the protrusion to pass through.

10. The battery according to claim 8, characterized in that The battery further includes a liquid injection hole column connected to the cover plate, the liquid injection hole column extends to the interior of the first cavity, one end of the second insulating member abuts against the side wall, and the other end of the second insulating member abuts against the liquid injection hole column.

11. The battery according to any one of claims 1 to 10, characterized in that: The pole piece assembly includes a second pole ear, which is arranged on the outside of the first insulating member and is welded in a gap between the cover plate and the shell.

12. The battery according to any one of claims 1 to 9, characterized in that: The pole piece assembly includes a second pole lug, the first insulating member is provided with an escape portion, the escape portion defines an opening, and the opening is used for the second pole lug to pass through, and the second pole lug passes through the opening and is electrically connected to the cover plate.

13. The battery according to claim 12, characterized in that The escape portion is configured to be formed by a portion of the first insulating member being recessed.

14. The battery according to claim 12, characterized in that The first insulating member is provided with a first cavity, and the battery further comprises a second insulating member disposed in the first cavity, one end of the second insulating member abuts against the side wall, and the other end of the second insulating member is provided with a notch, and the notch is disposed corresponding to the avoidance portion.

15. The battery according to claim 14, characterized in that The cover plate is provided with a first hole, and the battery also includes a liquid injection hole column, which extends to the interior of the first cavity through the first hole, and the liquid injection hole column is used to seal a part of the first hole. The battery also includes a second pole, and the second pole is used to seal another part of the first hole.

16. A top cover assembly, characterized in that: The upper cover assembly comprises: Cover plate; A first insulating member, the first insulating member is arranged on the inner side of the cover plate, the first insulating member includes a bottom wall and a side wall connected to the bottom wall, the bottom wall is arranged close to the top end surface of the pole piece, and the side wall is constructed to extend toward one side of the cover plate and abut against the cover plate.

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