Battery monomer, preparation method of battery monomer, battery and power utilization device thereof

Abstract

The invention discloses a battery monomer, a preparation method of the battery monomer, a battery and a power utilization device of the battery monomer, and the battery monomer comprises a shell which comprises a first wall; the pole is arranged on the first wall, a connecting hole penetrating through the pole is formed in the pole, at least part of the inner peripheral wall of the connecting hole forms a first inclined plane, and the first inclined plane is obliquely arranged relative to the axis of the connecting hole; the electrode assembly comprises an active substance coating part and a tab, the active substance coating part is arranged in the shell, the tab is electrically connected with the active substance coating part, and at least part of the tab extends into the connecting hole and is connected with the first inclined surface. According to the battery monomer disclosed by the invention, the connecting hole penetrating through the pole column is formed in the pole column, at least part of the inner wall of the connecting hole forms the first inclined surface, and at least part of the tab extends into the connecting hole and is fixedly connected with the first inclined surface, so that the tab occupies less space in the battery monomer, and the weight of the tab and the pole column is reduced; therefore, the energy density of the single battery can be well improved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery cell, a method for preparing the battery cell, a battery and an electrical device thereof. Background Art

[0002] With the increasingly serious environmental problems, the gradual maturity of people's environmental awareness and the rise in oil prices, more and more people will focus on new energy vehicles when purchasing vehicles, and the advantages and disadvantages of new energy vehicles in terms of endurance and power performance have a relatively important impact on people's choices. At present, most new energy vehicles use power batteries as energy storage and kinetic energy devices, and there are also traces of power batteries in other types of vehicles. The battery energy density of power batteries has a relatively important impact on the vehicle's endurance and power performance. Therefore, improving the energy density of batteries is a direction that needs to be studied in the process of continuous improvement and innovation of batteries.

[0003] Currently, batteries are provided with a longer tab structure for connection and assembly with the battery pole. The tab is longer and has a certain redundancy, so that it occupies a larger space in the battery, thereby reducing the energy density of the battery. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a battery cell, which can significantly improve the energy density of the battery cell.

[0005] The present invention also provides a method for preparing the battery monomer.

[0006] The present invention also provides a battery having the battery cell.

[0007] The present invention also provides an electrical device having the battery.

[0008] A battery cell according to a first aspect of the present invention comprises: a shell comprising a first wall; a pole arranged on the first wall and formed with a connection hole passing through the pole, at least a portion of the inner peripheral wall of the connection hole being formed as a first inclined surface, the first inclined surface being arranged obliquely relative to the axis of the connection hole; an electrode assembly comprising an active material coating portion and a pole ear, the active material coating portion being arranged in the shell, the pole ear being electrically connected to the active material coating portion, and at least a portion of the pole ear extending into the connection hole and connected to the first inclined surface.

[0009] According to the battery cell of the present invention, a connecting hole penetrating the pole is provided on the pole and at least a portion of the inner wall of the connecting hole is formed as a first inclined surface, and at least a portion of the pole ear extends into the connecting hole and is fixedly connected to the first inclined surface. This allows the pole ear to occupy less space in the battery cell, reducing the weight of the pole ear and the pole, thereby greatly improving the energy density of the battery cell.

[0010] In some embodiments of the present invention, the pole lug is connected to the pole by welding.

[0011] In this embodiment, the pole lug and the pole are connected and fixed by welding, and the connection is firm and reliable. When connecting and fixing, the welding connection has a smaller operating space and a reliable and fast connection effect, making the connection and fixing operation of the pole lug and the pole more convenient and efficient.

[0012] In some embodiments of the present invention, in a direction from the electrode assembly toward the pole, the first inclined surface extends obliquely outward along a radial direction of the connecting hole.

[0013] In the present embodiment, the first inclined surface is arranged to extend outwardly along the radial direction of the connecting hole, so that the first inclined surface can be oriented toward the end of the connecting hole away from the electrode assembly. Therefore, when the pole ear is fixedly connected to the first inclined surface, an external device can more conveniently extend into the connecting hole from the side of the pole facing outside the battery cell to contact the pole ear and operate the pole ear, thereby making the connection and fixation of the pole ear and the pole easier and more convenient.

[0014] In some embodiments of the present invention, the angle between the first inclined surface and a first plane perpendicular to the axis of the connecting hole is 0°-70°; or the angle between the first inclined surface and the first plane is 30°-60°.

[0015] In this embodiment, the angle between the first inclined surface and the first plane perpendicular to the axis of the connecting hole is limited to between 0° and 70°, which can better meet the needs of welding equipment, clamps, etc. for welding and fixing the pole lug and the pole, so that the pole lug and the pole can obtain a good and stable welding and fixing effect; the angle between the first inclined surface and the first plane is further limited, so that the angle between the first inclined surface and the first plane can be within a more suitable angle range, so that the pole lug can be more conveniently and quickly abutted against the first inclined surface after being extended into the connecting hole, and the welding equipment, clamps, etc. can be more conveniently and smoothly arranged to the welding position in the connecting hole to perform welding operations on the pole lug and the first inclined surface.

[0016] In some embodiments of the present invention, the pole includes: a pole body, the pole body is a hollow ring, a raised connecting protrusion is provided on the inner wall surface of the pole body, the pole body and the connecting protrusion cooperate to define the connecting hole, and the first inclined surface is formed on the connecting protrusion.

[0017] In this embodiment, the pole body and the connecting protrusion cooperate to define a connecting hole, the first inclined surface is formed on the connecting protrusion, the pole ear can be directly and conveniently attached to the first inclined surface and connected and fixed to the first inclined surface, the connecting protrusion can play a good structural reinforcement role on the pole body, so that the overall structural strength of the pole is higher, the first inclined surface is formed on the connecting protrusion, the connecting protrusion can well withstand the force when the pole ear is connected and fixed to the first inclined surface, so that the pole ear and the first inclined surface can be welded and fixed more stably.

[0018] In one embodiment of the present invention, in the axial direction of the connecting hole, at least a portion of a surface of a side of the connecting protrusion facing away from the electrode assembly is formed as the first inclined surface.

[0019] In this embodiment, the first inclined surface is arranged on the side of the connecting protrusion away from the electrode assembly, so that the connecting protrusion can form a certain separation effect on the electrode ear and the electrode assembly at the connecting hole, so that the electrode ear and the first inclined surface can reduce the influence and effect on the electrode assembly when being welded, so that the electrode assembly is more stable during assembly. The connecting protrusion can also have a certain sealing effect on the pole column, so that the stability of the battery cell is better.

[0020] In some examples of the present invention, the first inclined surface has a welding area, the pole lug is welded to the welding area, and in the axial direction of the connecting hole, the thickness of the connecting protrusion at the welding area is a first thickness, and the depth of the molten pool formed at the welding area of ​​the connecting protrusion when the pole lug is welded to the connecting protrusion is a first depth, and the first thickness is greater than the first depth.

[0021] In the present embodiment, the first thickness is set to be greater than the first depth, so that the connecting protrusion will not be welded through when the pole ear is welded and fixed to the first inclined surface, so that the connecting protrusion can maintain good structural strength and a stable connection and fixing effect with the pole ear, and the possibility of welding slag generated after the connecting protrusion is welded through and falling into the electrode assembly is reduced, and the possibility of higher temperature being transferred to the electrode assembly during welding and causing damage to the electrode assembly is reduced, so that the pole ear and the pole column can be welded more reliably and stably, so that the battery cell maintains good quality.

[0022] In an example of the present invention, a difference between the first thickness and the first depth is greater than or equal to 0.2 mm.

[0023] In this embodiment, the difference between the first thickness and the first depth is set to be greater than or equal to 0.5 mm, so that when the connecting protrusion is welded to the pole ear, the welding equipment can stably and reliably weld the pole ear to the first inclined surface and reliably reduce the possibility of welding through the connecting protrusion, thereby making the battery cell more stable during assembly.

[0024] In some specific embodiments of the present invention, the difference between the first thickness and the first depth is greater than or equal to 0.5 mm.

[0025] In this embodiment, the difference between the first thickness and the first depth is further limited, which can better reduce the possibility of welding equipment welding through the connecting bump when welding the tab and the first bevel, so that the battery cell structure can be more stable and reliable during assembly welding.

[0026] In some examples of the present invention, the first inclined surface is connected to a surface of one side of the connecting protrusion facing the electrode assembly in an arc shape.

[0027] In this embodiment, the first inclined surface is connected to the arc surface of the connecting protrusion facing the electrode assembly, so that the transition between the first inclined surface and the surface of the connecting protrusion facing the motor assembly can be relatively smooth, thereby reducing the possibility of damaging the pole ear when it is fixed with the first inclined surface. The position of the arc connection can provide a certain avoidance space for the pole ear to bend toward the first inclined surface, so that the pole ear can be more stably and reliably attached to the first inclined surface, thereby achieving a better welding effect when the pole ear is welded to the first inclined surface.

[0028] In one embodiment of the present invention, a surface of one side of the connecting protrusion facing the electrode assembly is flush with a surface of one side of the electrode body facing the electrode assembly.

[0029] In this embodiment, the surface of one side of the connecting protrusion facing the electrode assembly is flush with the surface of one side of the pole body facing the electrode assembly, so that the connecting protrusion can be completely located in the space surrounded by the inner wall of the pole body, thereby reducing the extra space occupied by the connecting protrusion in the battery cell, which can be beneficial to the improvement of the energy density of the battery cell to a certain extent, and the surface of the pole facing the electrode assembly is only formed with an opening structure of the connecting hole, so that the pole ear can be positioned more freely and stably at the opening position of the connecting hole and extend from the opening into the connecting hole to be fixed with the first inclined surface, so that the pole ear and the pole are more convenient to assemble.

[0030] In one embodiment of the present invention, the minimum width of the connecting hole is greater than or equal to 3 mm.

[0031] In this embodiment, the minimum width of the connection hole is set to be greater than or equal to 3 mm, so that the pole ear can be conveniently and reliably extended into the connection hole from the opening of the connection hole and fixed with the first inclined surface, making the connection and fixation of the pole ear and the pole more convenient and easy.

[0032] In one embodiment of the present invention, the ratio of the minimum width of the connection hole to the thickness of the tab is 1.5-5; or, the ratio of the minimum width of the connection hole to the thickness of the tab is 2.5-5.

[0033] In this embodiment, the ratio of the minimum width of the connection hole to the thickness of the pole lug is limited to 1.5-5, so that the connection hole has a larger minimum width to facilitate the insertion of the pole lug. It can be understood that the connection hole is formed by the inner wall of the pole body and the first inclined surface of the connection protrusion. The ratio of the minimum width of the connection hole to the thickness of the pole lug is limited to 1.5-2, so that the first inclined surface on the connection protrusion has a sufficient length to facilitate welding and fixing with the pole lug, so that the pole lug and the first inclined surface are well matched when the pole lug is welded to the pole; the ratio of the minimum width of the connection hole to the thickness of the pole lug is further limited to between 2.5-5, which can better reduce the possibility of the connection hole wall causing scratch damage to the pole lug when the pole lug is inserted, so that the pole lug can be more conveniently and reliably extended into the connection hole from the opening position of the minimum width of the connection hole and fixed with the first inclined surface.

[0034] In one embodiment of the present invention, the ratio of the minimum width of the connection hole to the maximum width of the connection hole is 0.3-0.5; or, the ratio of the minimum width of the connection hole to the maximum width of the connection hole is 0.35-0.45.

[0035] In this embodiment, the ratio of the minimum width of the connection hole to the maximum width of the connection hole is limited, which can make the design and manufacture of the pole more convenient. In this embodiment, the ratio of the minimum width to the maximum width of the connection hole is limited to between 0.3-0.5, so that the pole ear can be more conveniently and reliably extended into the connection hole from the opening at the minimum width of the connection hole to be connected and fixed with the first inclined surface, so that the first inclined surface formed by the connecting protrusion in the connection hole can better meet the needs of connection and fixation with the pole ear while keeping the original pole height dimension unchanged or reducing it, and the opening at the minimum width has a smaller opening structure, so that the connection hole can maintain a weaker connection between the shell accommodating cavity and the external environment to a certain extent, so that the pole can have a certain sealing effect on the battery cell; In this embodiment, the ratio of the minimum width to the maximum width of the connection hole is further limited, so that the connection hole can better facilitate the extension of the pole ear, and the first inclined surface can be more well and reliably matched with the pole ear for connection and fixation, so that the overall height dimension of the pole can be well improved and reduced, thereby facilitating the improvement of the energy density of the battery cell.

[0036] In one embodiment of the present invention, the pole further includes: a first ring, which is connected to one end of the pole body facing the electrode assembly, and the first ring extends radially outward from the pole body and extends circumferentially from the pole body in a ring shape; and a second ring, which is connected to the other end of the pole body facing away from the electrode assembly, and the second ring extends radially outward from the pole body and extends circumferentially from the pole body in a ring shape.

[0037] In this embodiment, the first ring and the second ring are respectively arranged at both ends of the pole body, and the first ring and the second ring can improve the structural strength of the pole body to a certain extent, so that the overall structural strength of the pole is better, so that the pole and the pole ear are more stable and reliable when connected and fixed, and the pole can better participate in the power transmission operation of the battery cell. The first ring and the second ring can cooperate with the pole body to form a slot structure, so as to facilitate the installation and fixation of the pole in the battery cell. The first ring and the second ring have a simple structure and are easy to use.

[0038] In some embodiments of the present invention, the battery cell further includes: a matching block, the matching block is disposed in the connecting hole, and the pole tab abuts between the matching block and the first inclined surface.

[0039] In this embodiment, a matching block is arranged in the connection hole to cooperate with the first inclined surface to clamp the pole ear, so that the pole ear can be stably abutted and fixed on the first inclined surface under the action of the matching block and maintain a good abutment state, so that it is more convenient to weld the pole ear to the pole. The matching block is arranged in the connection hole, which can further strengthen the structure of the pole. At the same time, the matching block can have a certain shielding effect on the opening of the connection hole facing the electrode assembly, so as to have a certain sealing effect on the pole, reduce the possibility of electrolyte leakage in the battery cell at the pole connection hole, and make the battery cell have good stability.

[0040] In one embodiment of the present invention, the matching block has a second inclined surface parallel to the first inclined surface, and the tab abuts between the first inclined surface and the second inclined surface.

[0041] A second inclined surface parallel to the first inclined surface is arranged on the matching block, so that the spacing between the first inclined surface and the second inclined surface in the extension direction perpendicular to the first inclined surface can always be the same, so that when the pole ear and the pole are welded and fixed, under the matching and pressing action of the second inclined surface and the first inclined surface, the pole ear part falling on the first inclined surface can always remain in a close and fixed state with the first inclined surface in the extension direction of the first inclined surface, so that the welding of the pole ear and the first inclined surface is more convenient and stable, and the matching block can stably and reliably press and fix the pole ear through the matching of the second inclined surface and the first inclined surface.

[0042] In some examples of the present invention, in the axial direction of the connecting hole, an end surface of the matching block facing one end of the electrode assembly abuts against the electrode assembly.

[0043] In this embodiment, the matching block is abutted against the electrode assembly, which can limit and fix the electrode assembly and the pole ear in the axial direction of the pole, and has a certain pressing effect on the pole ear, so that one end of the pole ear can be more stably extended into the connecting hole, so that the electrode assembly can be more securely placed in the battery cell after assembly.

[0044] In an example of the present invention, the matching block is connected to the pole by welding.

[0045] In this embodiment, the matching block and the pole are fixed by welding, and the connection is convenient and reliable, so that the matching block can stably and reliably cooperate with the connecting protrusion to clamp and fix the pole ear, thereby making the connection and fixing of the pole ear and the pole more stable and convenient.

[0046] In some examples of the present invention, a supporting protrusion is formed on the peripheral wall of the connecting hole, the supporting protrusion and the first inclined surface are arranged at intervals in the circumferential direction of the connecting hole, and one end of the matching block is supported on the supporting protrusion.

[0047] In this embodiment, a supporting protrusion is provided in the connecting hole to support and fix the matching block, so that when the matching block and the pole are assembled, the supporting protrusion can play a good supporting and limiting role for the matching block, reducing the possibility of excessive downward pressure of the matching block toward the first inclined surface, so that the matching block and the first inclined surface can better cooperate to clamp and fix the pole ear, and the supporting protrusion can further improve the structural strength of the pole to a certain extent, so that the structural stability of the pole is better.

[0048] In an example of the present invention, an angle between the first inclined surface, the second inclined surface and a first plane perpendicular to the axis of the connecting hole is 0°-60°.

[0049] In this embodiment, the angle between the first bevel and the second bevel and the first plane perpendicular to the axis of the connecting hole is limited to between 0° and 60°, so that the angle between the first bevel and the first plane and the angle between the second bevel and the first plane form acute angles and are within a smaller range, so that the inclination of the first bevel and the second bevel in the radial direction of the connecting hole is relatively gentle. When welding the pole ear and the pole column, since the welding direction of the welding equipment is perpendicular to the extension direction of the first bevel and the second bevel, the welding equipment can also be tilted at a smaller angle to extend into the connecting hole for welding operations, thereby better reducing the interference of the hole wall of the connecting hole on the welding equipment, clamps, etc., making it more convenient and easy to weld and fix the pole ear and the pole column.

[0050] In some specific embodiments of the present invention, the angles between the first inclined surface, the second inclined surface and the first plane are 0°-20°.

[0051] In this embodiment, the angle between the first bevel, the second bevel and the first plane is further limited to between 0° and 20°, so that the first bevel and the second bevel can extend more smoothly along the radial direction of the connecting hole, and the first bevel and the second bevel can better face the opening on the side of the connecting hole away from the electrode assembly, so that welding equipment, clamps, etc. can more easily, conveniently and quickly reach the welding position of the first bevel and the second bevel, making the welding and fixing of the pole ear and the pole more convenient and efficient.

[0052] In an example of the present invention, the other end of the matching block extends to the other side wall of the connecting hole opposite to the supporting protrusion.

[0053] In this embodiment, by extending the other end of the matching block to the other side wall of the connection hole opposite to the support protrusion, the matching block and the support protrusion can cooperate to seal the connection hole well, so that the end of the first inclined surface pole ear extending into the connection hole can be relatively closed between the first inclined surface and the second inclined surface, thereby effectively reducing the probability of the pole ear and the first inclined surface welding point contacting the external atmosphere through the connection hole, making the electrical connection between the pole ear and the pole more stable and reliable. The matching block and the side wall of the connection hole can form a good abutment and fixing effect, so that the matching block can better play a role in structural reinforcement of the pole, making the overall structure of the pole more stable and firm.

[0054] In some specific embodiments of the present invention, the matching block, the pole lug and the pole are welded together as a whole.

[0055] In this embodiment, the matching block is welded to the pole lug and the pole as a whole, so that the connection and fixation of the matching block to the pole lug and the pole are more firm and reliable, and the matching block and the pole can be fixed to the pole lug more firmly.

[0056] In one embodiment of the present invention, the material of the matching block is the same as that of the pole.

[0057] In this embodiment, the material of the matching block is set to be the same as that of the pole, which can make it more convenient to weld and fix the matching block to the pole, make the welding more firm, and achieve better welding effect.

[0058] In some embodiments of the present invention, the active material coating portion includes a current collector and an active material layer disposed on the current collector, the pole lug is electrically connected to the current collector, the pole lug includes a plurality of pole lug sheets, a plurality of the pole lug sheets converge at a position close to the current collector to form a first gathered portion, a plurality of the pole lug sheets converge at a position away from the current collector and are connected to form a second gathered portion, the first gathered portion connects the second gathered portion and the active material coating portion, and at least a portion of the second gathered portion extends into the connecting hole and is connected to the first inclined surface.

[0059] In this embodiment, a plurality of pole tab sheets are gathered together to form a pole tab, so that the pole tab and the pole can be reliably connected and fixed to the pole post through the second gathering portion when the pole tab and the pole post are welded and fixed, and the second gathering portion can have a smaller size and thickness, so that the pole tab can be more easily and conveniently inserted into the connecting hole and fixed to the first inclined surface.

[0060] In one embodiment of the present invention, at least a portion of the first gathering portion extends into the connecting hole and extends along the first inclined surface.

[0061] In this embodiment, at least a portion of the first folded portion is extended into the connecting hole and along the first inclined surface, so that the pole ear and the first inclined surface have a longer abutment and fixing dimension, thereby making the connection and fixation between the pole ear and the first inclined surface more stable and reliable, and the pole ear can occupy less space in the shell, so that the active material coating portion can be increased in size to improve the energy density of the battery cell, and the redundancy of the pole ear in the shell can be further reduced, so that the probability of short circuit between the pole ear and the active material coating portion is further reduced, thereby making the use of the battery cell more stable and reliable.

[0062] In one embodiment of the present invention, a ratio of a width of an overlap between the second gathered portion and the first inclined surface on the first inclined surface to a width of the first inclined surface is greater than or equal to 0.5.

[0063] In this embodiment, the width of the second gathered portion overlapping the first inclined surface on the first inclined surface and the width of the first inclined surface are limited to be greater than or equal to 0.5, so that the second gathered portion and the first inclined surface can have a sufficient overlapping length so that the second gathered portion can be stably and firmly connected to the first inclined surface, thereby making the connection between the pole ear and the pole stable and firm.

[0064] In some examples of the present invention, the ratio of the overlapping width of the second gathered portion and the first inclined surface to the width of the first inclined surface is 0.8-1.2.

[0065] This embodiment further limits the ratio of the overlapping width of the second gathering portion and the first inclined surface to the width of the first inclined surface, so that the second gathering portion and the first inclined surface can be better overlapped and matched, and the second gathering portion can maintain a larger overlapping surface and overlapping length with the first inclined surface, so that the connection and fixation between the pole ear and the pole column are more stable and reliable, and the redundant size of the first inclined surface or the second gathering portion can be reduced, so that the second gathering portion and the first inclined surface can be more conveniently matched and abutted, thereby reducing the space occupied by the pole ear and the pole column in the battery cell to a certain extent.

[0066] In some embodiments of the present invention, the battery cell further comprises: a cover plate, the cover plate covers an end of the connection hole away from the electrode assembly, and the cover plate is sealed and connected to the pole.

[0067] In this embodiment, a cover plate is provided to seal the pole, which can reliably seal the matching block and the pole ear structure located in the connection hole, so that the pole ear and the pole can be in a good closed environment after being welded and fixed, so that the pole ear and the pole can be stably and well connected during long-term use. The cover plate can cooperate with the pole to transmit electricity, and the cover plate can form a good electrical connection surface, so that the battery cell can be more conveniently connected to the electrical connector when in use.

[0068] In one embodiment of the present invention, a groove is formed on a surface of the pole facing away from the electrode assembly, the connection hole is formed on the inner side of the groove and passes through the bottom wall of the groove, and the cover plate is disposed in the groove.

[0069] In this embodiment, a groove is provided on the pole, so that the cover plate and the pole can be positioned more conveniently when being fixed, and the connection and fixation are more stable and reliable.

[0070] In some examples of the present invention, in a direction from the electrode assembly toward the cover plate, a side wall of the groove extends obliquely outward along a radial direction of the connection hole.

[0071] In this embodiment, the side wall of the groove is extended outwardly along the radial direction of the connecting hole, which can play a certain guiding role when the cover plate and the pole are assembled, so that the cover plate can be fixed in the groove more conveniently. The structure is simple and easy to assemble. The cover plate and the pole can be welded with high welding quality, so that the cover plate and the pole can have a better welding sealing effect.

[0072] In some examples of the present invention, a surface of one side of the cover plate facing away from the electrode assembly is flush with an end surface of one end of the pole facing away from the electrode assembly.

[0073] In this embodiment, the surface of one side of the cover plate facing away from the electrode assembly is flush with the end surface of the pole facing away from the electrode assembly, so that the cover plate and the pole can cooperate to form a continuous plane, thereby reducing the space occupied by the cover plate to a certain extent and increasing the electrical connection surface of the battery cell pole, so that the energy density of the battery cell can be improved to a certain extent, and the battery cell can be more conveniently electrically connected to the electrical connector through the end of the pole facing away from the electrode assembly.

[0074] According to the preparation method of the battery cell of the second aspect of the present invention, the battery cell is the battery cell of the first aspect of the present invention, and the preparation method comprises: extending one end of the pole ear into the connection hole of the pole column; making one side surface of the one end of the pole ear in the thickness direction abut against the first inclined surface; welding the one end of the pole ear to the first inclined surface.

[0075] According to the preparation method of the battery cell of the embodiment of the present invention, by extending the pole ear into the connecting hole of the pole column and abutting against the first inclined surface and welding it to be fixed, the pole ear can occupy less space in the battery cell, reducing the weight of the pole ear and the pole column, thereby greatly improving the energy density of the battery cell.

[0076] In some embodiments of the present invention, abutting one side surface of the one end of the pole ear in the thickness direction with the first inclined surface includes: placing a matching block into a connecting hole, and pressing the one end of the pole ear toward the first inclined surface through the matching block until it abuts with the first inclined surface.

[0077] In this embodiment, the matching block presses one end of the pole ear toward the first inclined surface, so that the pole ear can stably and reliably fit and abut against the first inclined surface under the action of the matching block. The matching block can reduce the extension degree of the mechanical device used to drive the matching block to move into the connecting hole, thereby making it easier and more convenient for the pole ear to abut and fix against the first inclined surface.

[0078] A battery according to a third aspect of the present invention comprises the battery cell according to the first aspect of the present invention.

[0079] According to the battery of the present invention, by setting the battery cell of the first aspect mentioned above, a connecting hole penetrating the pole is set on the pole and at least a part of the inner wall of the connecting hole is formed as a first inclined surface, at least a part of the pole ear extends into the connecting hole and is fixedly connected to the first inclined surface, so that the pole ear can occupy less space in the battery cell, reducing the weight of the pole ear and the pole, so that the energy density of the battery cell can be greatly improved.

[0080] The electric device according to the fourth aspect of the present invention comprises the battery according to the third aspect of the present invention, wherein the battery is used to provide electric energy.

[0081] According to the electrical device of the present invention, by setting the battery of the third aspect mentioned above, a connecting hole penetrating the pole is set on the pole and at least a part of the inner wall of the connecting hole is formed as a first inclined surface, at least a part of the pole ear extends into the connecting hole and is fixedly connected to the first inclined surface, so that the pole ear can occupy less space in the battery cell, reducing the weight of the pole ear and the pole, so that the energy density of the battery cell can be greatly improved.

[0082] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0083] Figure 1 is a schematic diagram of an electric device according to an embodiment of the present invention;

[0084] Figure 2 yes Figure 1An exploded view of the battery shown in ;

[0085] Figure 3 yes Figure 2 A cross-sectional view of a battery cell shown in ;

[0086] Figure 4 yes Figure 3 A schematic diagram of an electrode assembly shown in ;

[0087] Figure 5 yes Figure 3 A schematic diagram of the pole shown in ;

[0088] Figure 6 yes Figure 3 A schematic diagram of the mating block shown in ;

[0089] Figure 7 yes Figure 3 Schematic diagram of the electrode assembly, housing and pole assembly shown in FIG.

[0090] Figure 8 yes Figure 3 Schematic diagram of the assembly of the mating block with the housing, pole and electrode assembly shown in ;

[0091] Fig. 9 is a cross-sectional view of a battery cell according to another embodiment of the present invention;

[0092] Fig.10 yes Fig. 9 A schematic diagram of the mating block shown in ;

[0093] Fig.11 yes Fig. 9 Schematic diagram of the assembly of the housing, pole and electrode assembly shown in FIG.

[0094] Fig.12 yes Fig. 9 Schematic diagram of the assembly of the mating block with the housing, pole and electrode assembly shown in ;

[0095] Fig.13 is a schematic diagram of a battery cell according to an embodiment of the present invention.

[0096] Reference numerals:

[0097] 10. Battery cells;

[0098] 11. housing; 111. first wall; 112. accommodating chamber;

[0099] 12, pole; 121, first ring; 122, pole body; 1221, connecting protrusion; 12211, first inclined surface; 1222, supporting protrusion; 1223, connecting hole; 1224, groove; 123, second ring;

[0100] 13. electrode assembly; 131. active material coating portion; 132. electrode tab; 1321. first gathering portion; 1322. second gathering portion;

[0101] 14. Matching block; 141. Second inclined surface;

[0102] 15. Cover plate;

[0103] 20, box body; 201, first box body; 202, second box body;

[0104] 100, battery; 200, controller; 300, motor;

[0105] 1000. Electrical equipment. DETAILED DESCRIPTION

[0106] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0107] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" in the specification and claims of the present invention and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0108] In the description of the embodiments of the present invention, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present invention, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0109] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0110] In the description of the embodiments of the present invention, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0111] In the description of the embodiments of the present invention, the orientations or positional relationships indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "bottom", "axial", "radial", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the embodiments of the present invention and simplifying the description. They do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the embodiments of the present invention.

[0112] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0113] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. As the core components of new energy vehicles, power batteries have high requirements in terms of energy density and reliability.

[0114] When the battery cell is being processed and manufactured, it is necessary to connect the pole ear in the shell with the pole column. The pole ear is composed of multiple pole ear pieces led out from the pole piece in the battery cell. Usually, an adapter piece is arranged in the battery cell and welded to the multiple pole ear pieces, and then the adapter piece is welded to the pole column. There is also a connection method in which multiple pole ear pieces are ultrasonically pre-welded and then welded to the adapter piece. In order to meet the process requirements, the pole ear needs to be led out longer and have a certain redundancy to make the connection between the pole ear and the adapter piece and the pole column reliable and stable. The longer pole ear occupies a larger space when arranged in the battery cell, thereby reducing the energy density of the battery cell, making the energy density of the battery cell lower. At the same time, the adapter piece set also further reduces the energy density of the battery cell. The longer pole ear is prone to short-circuit with the pole piece, causing a short circuit in the battery, which makes the stability of the battery cell poor.

[0115] The connection between the pole tab and the pole post in the battery cell can also be connected by a process of pre-welding the pole tab and laser welding the pole post. Specifically, the pole tab is pre-welded and directly connected to the pole post by laser welding. This eliminates the use of adapters and can greatly improve the energy density of the battery cell. However, the pole tab still needs to be longer and have a certain redundancy to ensure a reliable and stable connection between the pole tab and the pole post. The pole tab occupies a larger space in the battery cell, which makes the energy density of the battery cell lower.

[0116] Based on the above considerations, in order to reduce the space occupied by the pole ear to improve the energy density of the battery cell, the present invention provides a battery cell, a connecting hole is provided in the pole column and a first inclined surface is provided in the connecting hole, the pole ear is fixedly connected to the first inclined surface, so that the pole ear occupies a smaller space in the battery cell, thereby greatly improving the energy density of the battery cell.

[0117] In the present invention, the battery cell 100 may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery or a magnesium-ion battery, etc., which is not limited in the embodiment of the present invention. The battery cell 100 may be cylindrical, flat, rectangular or other shapes, etc., which is not limited in the embodiment of the present invention. The battery cell 100 is generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, which is not limited in the embodiment of the present invention.

[0118] The battery 100 mentioned in the embodiment of the present invention refers to a single physical module including one or more battery cells 10 to provide higher voltage and capacity. For example, the battery 100 mentioned in the present invention can be a battery module or a battery 100 package. The battery module generally includes a plurality of battery cells 10. The battery 100 package generally includes a box 20 for encapsulating one or more battery cells 10 or one or more battery modules. The box 20 can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cell 10.

[0119] The battery cell 10 disclosed in the embodiment of the present invention can be used in an electric device 1000 using the battery 100 as a power source or various energy storage systems using the battery 100 as an energy storage element. The electric device 1000 can be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, and the like. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, and the like, and the spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, and the like.

[0120] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electric device 1000 according to an embodiment of the present invention.

[0121] refer to Figure 1 As shown, Figure 1 Schematic diagram of an electrical device 1000 according to an embodiment of the present invention. The vehicle may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle, and the battery 100 may be provided at the bottom, head or tail of the vehicle. The battery 100 may be used to power the vehicle, for example, the battery 100 may be used as an operating power source for the vehicle. The vehicle may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and operating power requirements of the vehicle during driving.

[0122] In some embodiments of the present invention, the battery 100 can be used not only as an operating power source for the vehicle, but also as a driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0123] Please refer to Figure 2 , Figure 2 The battery cell 10 provided for some embodiments of the present invention is an exploded view of the battery 100. The battery 100 includes a case 20 and a plurality of battery cells 10, and the battery cells 10 are accommodated in the case 20. The case 20 is used to provide an assembly space for the battery cells 10, and the case 20 can adopt a variety of structures. In some embodiments, the case 20 may include a first case 201 and a second case 202, and the first case 201 and the second case 202 cover each other, and the first case 201 and the second case 202 jointly define an assembly space for accommodating the battery cells 10. The second case 202 may be a hollow structure with one end open, and the first case 201 may be a plate-like structure, and the first case 201 covers the open side of the second case 202, so that the first case 201 and the second case 202 jointly define an assembly space; or, the first case 201 and the second case 202 may also be hollow structures with one side open (such as Figure 2 As shown in FIG. 2 , the open side of the first box body 201 covers the open side of the second box body 202. Of course, the box body 20 formed by the first box body 201 and the second box body 202 can be in various shapes, such as a cylinder or a cuboid.

[0124] In the battery 100, multiple battery cells 10 can be connected in series, in parallel or in a mixed connection. A mixed connection means that multiple battery cells 10 are connected in series and in parallel. Multiple battery cells 10 can be directly connected in series, in parallel or in a mixed connection, and then the whole formed by multiple battery cells 10 is accommodated in the box 20; or, the battery 100 can also be a battery module formed by multiple battery cells 10 connected in series, in parallel or in a mixed connection, and then multiple battery modules are connected in series, in parallel or in a mixed connection to form a whole, and accommodated in the box 20. The battery 100 may also include other structures, for example, the battery 100 may also include a busbar component, an electrical connector, etc. for realizing electrical connection between multiple battery cells 10.

[0125] Reference below Figure 3-Figure 11 A battery cell 10 according to an embodiment of the first aspect of the present invention will be described. Figure 3 yes Figure 2 A cross-sectional view of a battery cell 10 shown in FIG. Figure 4 yes Figure 3 A schematic diagram of the electrode assembly 13 shown in FIG. Figure 5 yes Figure 3 A schematic diagram of the pole 12 shown in FIG. Figure 6 yes Figure 3 A schematic diagram of the mating block 14 shown in FIG. Figure 7 yes Figure 3 Schematic diagram of the electrode assembly 13, the housing 11 and the pole 12 when they are assembled; Figure 8 yes Figure 3 Schematic diagram of the matching block 14 shown in FIG. 1 when it is assembled with the housing 11, the pole 12 and the electrode assembly 13; Fig. 9 is a cross-sectional view of a battery cell 10 according to another embodiment of the present invention; Fig.10 yes Fig. 9 A schematic diagram of the mating block 14 shown in FIG. Fig.11 yes Fig. 9 Schematic diagram of the housing 11, the pole 12 and the electrode assembly 13 when they are assembled; Fig.12 yes Fig. 9 Schematic diagram of the matching block 14 shown in FIG. 1 when it is assembled with the housing 11, the pole 12 and the electrode assembly 13; Fig.13 is a schematic diagram of a battery cell 10 according to an embodiment of the present invention.

[0126] like Figure 3-Figure 13As shown, the battery cell 10 according to the embodiment of the first aspect of the present invention includes: a shell 11, a pole 12 and an electrode assembly 13. Specifically, the shell 11 includes a first wall 111; the pole 12 is arranged on the first wall 111, and a connecting hole 1223 is formed to pass through the pole 12, and at least a part of the inner peripheral wall of the connecting hole 1223 is formed as a first inclined surface 12211, and the first inclined surface 12211 is arranged obliquely relative to the axis of the connecting hole 1223; the electrode assembly 13 includes an active material coating portion 131 and a pole ear 132, the active material coating portion 131 is arranged in the shell 11, the pole ear 132 is electrically connected to the active material coating portion 131, and at least a part of the pole ear 132 extends into the connecting hole 1223 and is connected to the first inclined surface 12211.

[0127] The shape of the housing 11 can be adjusted according to the type of the battery cell 10. For example, when the battery cell 10 is a square battery 100, the housing 11 is square. When the battery cell 10 is a cylindrical battery 100, the housing 11 is cylindrical. In the embodiments of the present invention, the housing 11 is square as an example. Figure 3 As shown, the shell 11 can be an aluminum shell, a stainless steel shell, etc. The shell 11 is used to accommodate the electrode assembly 13 in the battery cell 10 and fix the pole 12. The first wall 111 of the shell 11 is formed in the length direction of the shell 11 (such as Figure 3 When the battery cell 10 is assembled, the electrode assembly 13 can be placed in the accommodating cavity 112 of the shell 11, and the pole 12 is fixed on the first wall 111 of the shell 11. Specifically, the first wall 111 of the shell 11 can be provided with a thickness direction of the first wall 111 (such as Figure 3 The pole 12 is disposed in the mounting hole and is fixedly connected to the housing 11. For example, the pole 12 and the housing 11 can be fixed by welding or riveting.

[0128] The pole 12 is used to connect the battery cell 10 with the electrical connector and transmit electrical energy. The material of the pole 12 can be copper, aluminum, zinc and alloys thereof, and the shape of the pole 12 can be set to a circular, rectangular or other shape structure according to design requirements. Generally, the number of poles 12 is at least two. Specifically, the pole 12 is at least one positive pole and at least one negative pole. For example, when the number of poles 12 is two, one is a positive pole and the other is a negative pole, and the two are electrically connected to the positive and negative tabs 132 of the electrode assembly 13 respectively; for another example, when the number of poles 12 is four, two can be positive poles and two can be negative poles. At this time, both positive poles are electrically connected to the positive tabs of the battery cell assembly, and both negative poles are electrically connected to the negative tabs of the battery cell assembly.

[0129] The electrode assembly 13 is usually formed by laminating or winding electrode sheets and a separator. The electrode sheets include a positive electrode sheet and a negative electrode sheet. The positive electrode tab led out from the positive electrode sheet is electrically connected to the positive electrode column, and the negative electrode tab led out from the negative electrode sheet is electrically connected to the negative electrode column.

[0130] The positive electrode sheet generally includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer can be directly or indirectly coated on the positive electrode collector to form a positive electrode active material coating portion of the electrode assembly 13. The portion of the positive electrode collector that is not coated with the positive electrode active material layer protrudes from the positive electrode active material coating portion to form a positive electrode ear sheet. Multiple positive electrode ear sheets are stacked together to form a positive electrode ear, whereby the positive electrode ear is led out from the positive electrode sheet and electrically connected to the positive electrode active material coating portion. The materials of the positive electrode collector and the positive electrode active material coating portion are set accordingly according to the type of battery cell 10. For example, when the battery 100 is a lithium-ion battery, the material of the positive electrode collector can be aluminum, and the material of the positive electrode active material coating portion can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc.

[0131] The negative electrode sheet generally includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer can be directly or indirectly coated on the negative electrode current collector to form the negative electrode active material coating part of the electrode assembly 13. The part of the negative electrode current collector that is not coated with the negative electrode active material layer protrudes from the negative electrode active material coating part to form a negative electrode tab sheet. A plurality of negative electrode tab sheets are stacked together to form a negative electrode tab, whereby the negative electrode tab is led out from the negative electrode sheet and electrically connected to the negative electrode active material coating part. The materials of the negative electrode current collector and the negative electrode active material coating part are set accordingly according to the type of the battery cell 10. For example, when the battery 100 is a lithium-ion battery, the material of the negative electrode current collector can be copper, and the material of the negative electrode active material coating part can be carbon or silicon, etc. The material of the separator is not limited, for example, the separator can be a polypropylene film or a polyethylene film, etc.

[0132] For the convenience of description, the embodiments of the present invention will not distinguish between the positive and negative electrodes of the pole 12, the pole ear 132 and the pole piece. The pole 12, the pole ear 132 and the pole piece and the related descriptions involved in the embodiments of the present invention can be applied to the positive pole ear, the positive pole column, the positive pole piece and other structures, or to the negative pole ear, the negative pole column, the negative pole piece and other structures, or to the positive and negative pole ears 132, the positive and negative pole columns 12 and the positive and negative pole pieces and other structures.

[0133] In this embodiment, at least a portion of the pole lug 132 extends into the connection hole 1223 , that is, the pole lug 132 may partially extend into the connection hole 1223 , or the pole lug 132 may fully extend into the connection hole 1223 .

[0134] In this embodiment, a connection hole 1223 is formed on the pole 12, and the shape of the connection hole 1223 can match the shape of the pole 12, and at least a portion of the inner peripheral wall of the connection hole 1223 is formed as a first inclined surface 12211, that is, the inner peripheral wall of the connection hole 1223 can partially form the first inclined surface 12211, and the inner peripheral wall of the connection hole 1223 can also be completely formed with the first inclined surface 12211. Here, completely means that the first inclined surface 12211 can extend from one end of the axial direction of the connection hole 1223 to the other end. The inclination angle and size of the first inclined surface 12211 can be reasonably set as needed. When the pole ear 132 is fixedly connected to the first inclined surface 12211, the pole ear 132 extends into the connecting hole 1223 of the pole 12 and tilts toward the first inclined surface 12211, so that the pole ear 132 can fit with the first inclined surface 12211. After the pole ear 132 fits with the first inclined surface 12211, the pole ear 132 and the first inclined surface 12211 can be connected by welding, riveting, bolts, etc.

[0135] In the present embodiment, a shell 11 is provided. As an indispensable component of the battery cell 10, the shell 11 can facilitate the assembly and fixation of the electrode assembly 13 and the pole 12 in the battery cell 10. The shell 11 can provide good protection and sealing for the electrode assembly 13, thereby enabling the battery cell 10 to maintain a stable structural state and use state during processing, transportation and use. The structure is simple and the use effect is good.

[0136] In this embodiment, the pole 12 is provided with a through connection hole 1223, which can reduce the weight of the pole 12, thereby improving the energy density of the battery cell 10 to a certain extent. At least part of the pole ear 132 extends into the connection hole 1223 of the pole 12 and is connected and fixed to the pole 12, so that the pole ear 132 and the pole 12 in the battery cell 10 can be partially overlapped in the arrangement space, thereby greatly reducing the space occupied by the pole ear 132 in the battery cell 10, so that the energy density of the battery cell 10 is greatly improved.

[0137] It can be understood that when the pole ear 132 is connected and fixed to the pole 12, the pole ear 132 and the pole 12 need to have a sufficient connection and fixing surface. Specifically, the length of the pole ear 132 fixedly connected to the pole 12 needs to meet certain requirements. In this embodiment, when at least a portion of the pole ear 132 is extended into the connection hole 1223 of the pole 12 to be connected and fixed to the pole 12, the height dimension of the pole 12 needs to be adaptively adjusted according to the dimension of the pole ear 132 in the height direction of the pole 12. When the pole ear 132 is in the height direction of the pole 12 (such as Figure 3When the dimension of the pole 12 (in the vertical direction shown in the figure) is longer, the height of the pole 12 needs to be set higher, which will increase the weight and volume of the pole 12, thereby reducing the energy density of the battery cell 10. The height dimension of the pole 12 here refers to the length dimension of the pole 12 in the axial direction of the connecting hole 1223.

[0138] In this embodiment, at least a portion of the inner wall of the connection hole 1223 of the pole 12 is formed with a first inclined surface 12211, and the first inclined surface 12211 is arranged obliquely relative to the axis of the connection hole 1223, so that the first inclined surface 12211 has a shorter length in the axial direction of the connection hole 1223 and a longer length in the oblique direction. When at least a portion of the pole ear 132 is inserted into the connection hole 1223 and fixedly connected with the first inclined surface 12211, the pole ear 132 can be fixed with the first inclined surface 12211 along the oblique direction of the first inclined surface 12211. , so that it can have a sufficient connection and fixing length with the first inclined surface 12211, so that the pole ear 132 can be stably and reliably connected and fixed to the pole 12, and the pole ear 132 has a smaller arrangement size in the axial direction of the connecting hole 1223, so that the height dimension of the pole 12 can be set according to the conventional size or shortened to a certain extent, so that the weight and volume of the pole 12 can remain unchanged or reduced. Therefore, the method of fixedly connecting the pole ear 132 to the first inclined surface 12211 can make the battery cell 10 have a higher energy density.

[0139] Since the pole lug 132 extends into the connecting hole 1223 and is fixed on the first inclined surface 12211, the pole lug 132 is more stable and convenient to be fixed and assembled with the pole post 12, which can reduce the possibility of the pole lug 132 falling off. In addition, when the pole lug 132 is processed and manufactured, the length of the pole lug 132 required for connection and fixation can be determined more conveniently, thereby reducing the length redundancy of the pole lug 132, reducing the weight and volume of the pole lug 132 to a certain extent, and further improving the energy density of the battery cell 10.

[0140] It can be understood that the electrode pieces in the battery cell 10 include a positive electrode piece and a negative electrode piece. In this embodiment, after the electrode ear 132 is electrically connected to the first inclined surface 12211, it can have a better separation effect with the electrode piece of the other polarity in the shell 11, thereby effectively reducing the probability of short circuit in the battery cell 10 and making the battery cell 10 more stable.

[0141] According to the battery cell 10 of the embodiment of the present invention, a connection hole 1223 penetrating the pole 12 is provided on the pole 12, and at least a portion of the inner wall of the connection hole 1223 is formed as a first inclined surface 12211, and at least a portion of the pole lug 132 extends into the connection hole 1223 and is fixedly connected to the first inclined surface 12211. This can make the pole lug 132 occupy less space in the battery cell 10, reduce the weight of the pole lug 132 and the pole 12, and thus greatly improve the energy density of the battery cell 10.

[0142] In some embodiments of the present invention, the pole lug 132 may be connected to the pole 12 by welding.

[0143] The pole tab 132 is welded to the pole post 12 . For example, the pole tab 132 and the pole post 12 can be welded and fixed by ultrasonic welding, laser welding, resistance heat melting welding or other welding methods.

[0144] In this embodiment, the pole lug 132 and the pole post 12 are connected and fixed by welding, and the connection is firm and reliable. When the connection and fixation are performed, the welding connection has a smaller operating space and a reliable and fast connection effect, making the connection and fixation operation of the pole lug 132 and the pole post 12 more convenient and efficient.

[0145] In some embodiments of the present invention, Figure 3-Figure 5 As shown, in the direction from the electrode assembly 13 toward the pole 12, the first inclined surface 12211 can be along the radial direction of the connecting hole 1223 (such as Figure 3 The left and right directions shown) extend obliquely outward.

[0146] refer to Figure 3 and Figure 4 As shown, the direction of the electrode assembly 13 toward the pole 12 refers to the axial direction of the connecting hole 1223 (such as Figure 3 In the up and down directions shown in the figure, from the side of the pole 12 facing the inside of the battery cell 10 toward the side outside the battery cell 10, the first slope 12211 in this embodiment extends obliquely outward along the radial direction of the connecting hole 1223, and the pole ear 132 extends into the connecting hole 1223 from the side of the first slope 12211 facing the electrode assembly 13 and extends obliquely outward along the first slope 12211 toward the radial direction of the connecting hole 1223. In the actual assembly process, the pole ear 132 can first extend into the connecting hole 1223 along the axial direction of the connecting hole 1223, and the pole ear 132 is then bent toward the first slope 12211 to fit the first slope 12211, thereby being fixed to the first slope 12211.

[0147] In the present embodiment, the first inclined surface 12211 is arranged to extend outwardly along the radial direction of the connecting hole 1223, so that the first inclined surface 12211 can be oriented toward the end of the connecting hole 1223 which is away from the electrode assembly 13. Thus, when the pole lug 132 is fixedly connected to the first inclined surface 12211, an external device can more conveniently extend into the connecting hole 1223 from the side of the pole 12 facing the outside of the battery cell 10 to contact the pole lug 132 and operate the pole lug 132, thereby making the connection and fixation of the pole lug 132 and the pole 12 easier and more convenient.

[0148] In some embodiments of the present invention, the angle between the first inclined surface 12211 and the first plane perpendicular to the axis of the connecting hole 1223 may be 0°-70°.

[0149] In this embodiment, the angle between the first inclined surface 12211 and the first plane perpendicular to the axis of the connecting hole 1223 is limited to between 0° and 70°, for example, the angle can be 10°, 20°, 30°, 40°, 50°, 60°, etc. Figure 3 As shown in the figure, the straight line L represents the axis of the connecting hole 1223, the straight line L1 represents the first plane, the first plane is perpendicular to the axis, and the extension line L2 of the first inclined surface 12211 toward the first plane forms an angle α with the first plane L1.

[0150] It can be understood that when the pole ear 132 is welded and fixed to the pole 12, the welding position of the pole ear 132 and the pole 12 is in the connecting hole 1223 of the pole 12, and the hole wall of the connecting hole 1223 causes certain obstacles and interference to the arrangement and movement of welding equipment, clamps, etc. In this embodiment, the angle between the first inclined surface 12211 and the first plane perpendicular to the axis of the connecting hole 1223 is limited to between 0° and 70°, which can better meet the needs of welding equipment, clamps, etc. for welding and fixing the pole ear 132 and the pole 12, so that the pole ear 132 and the pole 12 can obtain a good and stable welding and fixing effect.

[0151] In one embodiment of the present invention, the angle between the first inclined surface 12211 and the first plane may be 30°-60°.

[0152] In this embodiment, the angle between the first inclined surface 12211 and the first plane perpendicular to the axis of the connecting hole 1223 is limited to between 30° and 60°. For example, the angle can be 30°, 35°, 40°, 45°, 50°, 55°, 60°, etc.

[0153] This embodiment further limits the angle between the first bevel 12211 and the first plane, so that the angle between the first bevel 12211 and the first plane is within a more suitable angle range, so that the pole ear 132 can be more conveniently and quickly abutted against the first bevel 12211 after extending into the connecting hole 1223, and welding equipment, clamps, etc. can be more conveniently and smoothly arranged at the welding position in the connecting hole 1223 to perform welding operations on the pole ear 132 and the first bevel 12211.

[0154] In some embodiments of the present invention, Figure 5 As shown, the pole 12 may include: a pole body 122, which is a hollow ring, and a raised connecting protrusion 1221 is provided on the inner wall surface of the pole body 122, and the pole body 122 and the connecting protrusion 1221 cooperate to define a connecting hole 1223, and a first inclined surface 12211 is formed on the connecting protrusion 1221.

[0155] The pole body 122 is configured as a hollow ring, for example, the cross section of the pole body 122 can be formed into a ring structure such as a circular ring, a waist-shaped frame, a rectangular frame, etc. The connecting protrusion 1221 is arranged on the inner wall surface of the pole body 122. Specifically, the side of the connecting protrusion 1221 close to the inner wall surface of the pole body 122 can be attached to the inner wall surface of the pole body 122 and connected to the inner wall surface of the pole body 122. The connecting protrusion 1221 can be separated from the pole body 122, and the connecting protrusion 1221 can also form an integral structure with the pole body 122. The material of the connecting protrusion 1221 can be the same as or different from the material of the pole body 122.

[0156] In this embodiment, the pole body 122 cooperates with the connecting protrusion 1221 to define a connecting hole 1223, and the first inclined surface 12211 is formed on the connecting protrusion 1221. Figure 3 and Figure 4 As shown, the first bevel 12211 is located on the side of the connecting protrusion 1221 that is away from the electrode assembly 13 in the axial direction of the pole 12. The first bevel 12211 can be formed as a part of the hole wall of the connecting hole 1223. After the pole ear 132 is inserted into the connecting hole 1223, the pole ear 132 can be directly and conveniently attached to the first bevel 12211 and connected and fixed to the first bevel 12211.

[0157] In this embodiment, a raised connecting protrusion 1221 is provided on the inner wall surface of the pole body 122. The connecting protrusion 1221 can play a good role in structural reinforcement of the pole body 122, so that the overall structural strength of the pole 12 is higher. The first inclined surface 12211 is formed on the connecting protrusion 1221. The connecting protrusion 1221 can well withstand the force when the pole ear 132 is connected and fixed to the first inclined surface 12211, so that the pole ear 132 and the first inclined surface 12211 can be welded and fixed more stably.

[0158] In one embodiment of the present invention, Figure 4 As shown, in the axial direction of the connecting hole 1223 (such as Figure 3 In the up-down direction shown in FIG. 1 , at least a portion of a surface of the connecting bump 1221 that faces away from the electrode assembly 13 may be formed as a first inclined surface 12211.

[0159] At least a portion of the side surface of the connecting bump 1221 facing away from the electrode assembly 13 is formed as a first slope 12211, that is, the side surface of the connecting bump 1221 facing away from the electrode assembly 13 can be formed as the first slope 12211, and a portion of the side surface of the connecting bump 1221 facing away from the electrode assembly 13 can also be formed as the first slope 12211, for example, a portion of the side surface of the connecting bump 1221 facing away from the electrode assembly 13 is formed as the first slope and the other portion is formed as a plane, a curved surface, a folded surface, etc.

[0160] In this embodiment, the first inclined surface 12211 is arranged on the side of the connecting protrusion 1221 away from the electrode assembly 13, so that the connecting protrusion 1221 can form a certain separation effect on the electrode ear 132 and the electrode assembly 13 at the connecting hole 1223, so that the influence and effect on the electrode assembly 13 can be reduced when the electrode ear 132 and the first inclined surface 12211 are welded, so that the electrode assembly 13 is more stable during assembly. The connecting protrusion 1221 can also have a certain sealing effect on the pole column 12, so that the battery cell 10 has better stability.

[0161] In some examples of the present invention, reference Figure 3 and Figure 4 As shown, the first inclined surface 12211 may have a welding area, and the pole ear 132 is welded to the welding area. In the axial direction of the connecting hole 1223, the thickness of the connecting protrusion 1221 at the welding area is a first thickness. When the pole ear 132 is welded to the connecting protrusion 1221, the depth of the molten pool formed at the welding area of ​​the connecting protrusion 1221 is a first depth, and the first thickness is greater than the first depth.

[0162] The welding area refers to the area where the pole lug 132 is welded to the first bevel 12211. When welding the pole lug 132 to the first bevel 12211, the welding equipment quickly melts the pole lug 132 and the first bevel 12211 in the welding area, evaporates and solidifies them, so that the pole lug 132 and the first bevel 12211 are connected and fixed. The thickness of the connecting protrusion 1221 at the welding area position refers to the thickness of the connecting protrusion 1221 at the welding area position in the axial direction of the connecting hole 1223. The molten pool depth refers to the distance between the deepest position of the molten part of the base material and the surface of the base material. The molten pool depth in this embodiment refers to the size of the melting of the connecting protrusion 1221 at the welding area in the axial direction of the connecting hole 1223, such as Figure 3 As shown in the figure, h1 represents the first thickness and h2 represents the first depth.

[0163] In this embodiment, the first thickness is set to be greater than the first depth, so that the pole ear 132 and the first inclined surface 12211 are welded and fixed without being welded through the connecting protrusion 1221, so that the connecting protrusion 1221 can maintain good structural strength and a stable connection and fixing effect with the pole ear 132, and reduce the possibility of welding slag generated after the connecting protrusion 1221 is welded through and falling into the electrode assembly 13, and reduce the possibility of higher temperature during welding being transferred to the electrode assembly 13 and causing damage to the electrode assembly 13, so that the pole ear 132 and the pole 12 can be welded more reliably and stably, so that the battery cell 10 maintains good quality.

[0164] In an example of the present invention, the difference between the first thickness and the first depth may be greater than or equal to 0.2 mm.

[0165] In this embodiment, the difference between the first thickness and the first depth is set to be greater than or equal to 0.2 mm. For example, the difference between the first thickness and the first depth can be 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, etc.

[0166] In this embodiment, the difference between the first thickness and the first depth is set to be greater than or equal to 0.5 mm, so that when the connecting protrusion 1221 and the pole ear 132 are welded and fixed, the welding equipment can stably and reliably weld the pole ear 132 and the first inclined surface 12211, and reliably reduce the possibility of welding through the connecting protrusion 1221, thereby making the battery cell 10 more stable during assembly.

[0167] In some specific embodiments of the present invention, the difference between the first thickness and the first depth may be greater than or equal to 0.5 mm.

[0168] In this embodiment, the difference between the first thickness and the first depth is set to be greater than or equal to 0.5 mm. For example, the difference between the first thickness and the first depth can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, etc.

[0169] In this embodiment, the difference between the first thickness and the first depth is further limited, which can better reduce the possibility of welding equipment welding through the connecting protrusion 1221 when welding the pole ear 132 and the first inclined surface 12211, so that the battery cell 10 can have a more stable and reliable structure during assembly welding.

[0170] In some examples of the present invention, Figure 4 As shown, the first inclined surface 12211 and the surface of the connecting protrusion 1221 facing the electrode assembly 13 may be connected in an arc.

[0171] Specifically, refer to Figure 3 and Figure 4 As shown, the side of the first inclined surface 12211 facing the electrode assembly 13 can be connected to the arc of the surface of the side of the connecting protrusion 1221 facing the electrode assembly 13, and the arc can be a semicircular arc, a quarter circular arc, etc. The radius of the arc can be reasonably set according to the welding connection requirements of the pole ear 132 and the first inclined surface 12211. When the pole ear 132 is fixed with the first inclined surface 12211, the part of the pole ear 132 located on the side of the pole 12 facing the electrode assembly 13 and the part of the pole ear 132 extending into the connecting hole 1223 clamp the connecting protrusion 1221, and the side of the pole ear 132 facing the first inclined surface 12211 forms an angle with the side of the pole ear 132 facing the connecting protrusion 1221, and the part where the first inclined surface 12211 is connected to the arc of the surface of the side of the connecting protrusion 1221 facing the electrode assembly 13 is located at the angle formed by the pole ear 132.

[0172] In this embodiment, the first bevel 12211 is connected to the arc surface of the side of the connecting protrusion 1221 facing the electrode assembly 13, so that the transition between the first bevel 12211 and the side surface of the connecting protrusion 1221 facing the motor assembly can be relatively smooth, thereby reducing the possibility of damaging the pole ear 132 when the pole ear 132 is fixed with the first bevel 12211, and the position of the arc connection can provide a certain avoidance space for the pole ear 132 to bend toward the first bevel 12211, so that the pole ear 132 can be more stably and reliably attached to the first bevel 12211, thereby achieving a better welding effect when the pole ear 132 is welded to the first bevel 12211.

[0173] In one embodiment of the present invention, Figure 4As shown, a surface of the connection protrusion 1221 facing the electrode assembly 13 may be flush with a surface of the electrode body 122 facing the electrode assembly 13 .

[0174] like Figure 4 As shown, a side surface of the pole body 122 facing the electrode assembly 13 is formed with an opening of a connecting hole 1223, a side surface of the connecting protrusion 1221 facing the electrode assembly 13 is flush with a side surface of the pole body 122 facing the electrode assembly 13, and cooperates with a side surface of the pole body 122 facing the electrode assembly 13 to form the opening of the connecting hole 1223, the distance between the side surface of the connecting protrusion 1221 facing the electrode assembly 13 and the electrode assembly 13 is the same as the distance between the side surface of the pole body 122 facing the electrode assembly 13 and the electrode assembly 13, and the pole ear 132 led out from the side of the electrode assembly 13 toward the pole body 122 extends into the connecting hole 1223 from the opening of the connecting hole 1223 and is fixed with the first inclined surface 12211 of the connecting protrusion 1221.

[0175] In this embodiment, the side surface of the connecting protrusion 1221 facing the electrode assembly 13 is flush with the side surface of the pole body 122 facing the electrode assembly 13, so that the connecting protrusion 1221 can be completely located in the space surrounded by the inner wall of the pole body 122, thereby reducing the extra space occupied by the connecting protrusion 1221 in the battery cell 10, which can be beneficial to the improvement of the energy density of the battery cell 10 to a certain extent, and the side surface of the pole 12 facing the electrode assembly 13 is only formed with an opening structure of the connecting hole 1223, so that the pole ear 132 can be positioned more freely and stably at the opening position of the connecting hole 1223 and extend from the opening into the connecting hole 1223 to cooperate and fix with the first inclined surface 12211, so that the pole ear 132 and the pole 12 are more convenient to assemble.

[0176] In one embodiment of the present invention, the minimum width of the connection hole 1223 may be greater than or equal to 3 mm.

[0177] The width of the connection hole 1223 refers to the width in the radial direction of the pole 12. Since the first inclined surface 12211 is formed as a part of the inner wall of the connection hole 1223, the first inclined surface 12211 extends obliquely outward along the radial direction of the pole 12 from the side of the pole body 122 facing the electrode assembly 13 toward the side of the pole body 122 away from the electrode assembly 13, and the width of the connection hole 1223 gradually increases along the axial direction of the connection hole 1223 toward the direction away from the electrode assembly 13. In other words, the width of the opening position of the connection hole 1223 formed by cooperating with the connecting protrusion 1221 on the side of the pole body 122 facing the electrode assembly 13 is the minimum width of the connection hole 1223. When the pole lug 132 is welded to the pole 12, the pole lug 132 needs to extend from the opening position of the connection hole 1223 with the minimum width into the connection hole 1223 and be fixed in cooperation with the first inclined surface 1221. Reference Figure 4 As shown in the figure, L3 is schematically shown as the minimum width of the connection hole 1223. For example, the minimum width L3 of the connection hole 1223 can be 3mm, 3.2mm, 3.4mm, 3.6mm, 3.8mm, 4mm, etc.

[0178] In this embodiment, the minimum width of the connection hole 1223 is set to be greater than or equal to 3 mm, so that the pole ear 132 can be easily and reliably extended into the connection hole 1223 from the opening of the connection hole 1223 and fixed with the first inclined surface 12211, making it more convenient and easy to connect and fix the pole ear 132 to the pole 12.

[0179] In one embodiment of the present invention, the ratio of the minimum width of the connection hole 1223 to the thickness of the tab 132 may be 1.5-5.

[0180] The thickness of the tab 132 refers to the distance between the side surface of the tab 132 that is in contact with the first slope 12211 and the side surface of the tab 132 that is away from the first slope 12211. For example, the ratio of the minimum width of the connection hole 1223 to the thickness of the tab 132 can be 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, etc.

[0181] In this embodiment, the ratio of the minimum width of the connection hole 1223 to the thickness of the pole lug 132 is limited to 1.5-5, so that the connection hole 1223 has a larger minimum width to facilitate the insertion of the pole lug 132. It can be understood that the connection hole 1223 is formed by the inner wall of the pole body 122 and the first inclined surface 12211 of the connection protrusion 1221. The ratio of the minimum width of the connection hole 1223 to the thickness of the pole lug 132 is limited to 1.5-5, so that the first inclined surface 12211 on the connection protrusion 1221 has a sufficient length to facilitate welding and fixing with the pole lug 132, so that the pole lug 132 and the first inclined surface 12211 are well matched when the pole lug 132 is welded to the pole 12.

[0182] In some examples of the present invention, the ratio of the minimum width of the connection hole 1223 to the thickness of the tab 132 may be 2.5-5.

[0183] In this embodiment, the ratio of the minimum width of the connecting hole 1223 to the thickness of the pole ear 132 is limited to 2.5-5. For example, the ratio of the minimum width of the connecting hole 1223 to the thickness of the pole ear 132 can be 2.5, 2.6, 2.7, 2.8, 2.9, 3, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, 5 and the like.

[0184] In this embodiment, the ratio of the minimum width of the connecting hole 1223 to the thickness of the pole ear 132 is further limited to between 2.5 and 5, which can better reduce the possibility of the pole ear 132 being damaged by the wall of the connecting hole 1223 when the pole ear 132 is inserted, and enable the pole ear 132 to be more conveniently and reliably inserted into the connecting hole 1223 from the opening position of the minimum width of the connecting hole 1223 and fixed in cooperation with the first inclined surface 12211.

[0185] In one embodiment of the present invention, the ratio of the minimum width of the connection hole 1223 to the maximum width of the connection hole 1223 may be 0.3-0.5.

[0186] The maximum width of the connection hole 1223 refers to the maximum width of the connection hole 1223 in the radial direction of the pole 12. Figure 4 As shown in the figure, L4 is indicated as the maximum width of the connection hole 1223, and the maximum width of the connection hole 1223 can be formed at the opening of the side of the connection hole 1223 away from the electrode assembly 13. The ratio of the minimum width of the connection hole 1223 to the maximum width of the connection hole 1223 can be 0.3, 0.35, 0.4, 0.45, 0.5, etc., and the ratio is less than or equal to 0.5, that is, the opening of the end of the connection hole 1223 facing the electrode assembly 13 is smaller than half of the opening of the end of the connection hole 1223 away from the electrode assembly 13.

[0187] In the present embodiment, the ratio of the minimum width of the connection hole 1223 to the maximum width of the connection hole 1223 is limited, so that during the processing and manufacturing of the pole 12, the overall width of the connection hole 1223 can be more conveniently determined and manufactured according to the required width dimension of the opening of the connection hole 1223 toward the side of the electrode assembly 13, making the design and manufacturing of the pole 12 more convenient.

[0188] In this embodiment, the ratio of the minimum width to the maximum width of the connecting hole 1223 is limited to between 0.3 and 0.5, so that the pole ear 132 can be more conveniently and reliably extended from the opening at the minimum width of the connecting hole 1223 into the connecting hole 1223 and connected and fixed to the first inclined surface 12211, so that the first inclined surface 12211 formed by the connecting protrusion 1221 in the connecting hole 1223 can better meet the needs of connecting and fixing with the pole ear 132 while keeping the original height size of the pole 12 unchanged or reducing it, and the opening at the minimum width has a smaller opening structure, so that the connection hole 1223 can maintain a weaker connection effect on the housing cavity 112 of the shell 11 and the external environment to a certain extent, so that the pole 12 can have a certain sealing effect on the battery cell 10.

[0189] In some examples of the present invention, the ratio of the minimum width of the connection hole 1223 to the maximum width of the connection hole 1223 may be 0.35-0.45.

[0190] For example, the ratio of the minimum width to the maximum width of the connection hole 1223 may be 0.35, 0.36, 0.37, 0.38, 0.39, 0.4, 0.41, 0.42, 0.43, 0.44, 0.45, and so on.

[0191] This embodiment further limits the ratio of the minimum width to the maximum width of the connection hole 1223, so that the connection hole 1223 can better facilitate the insertion of the pole ear 132, and the first inclined surface 12211 can be better and more reliably matched with the pole ear 132 for connection and fixation, so that the overall height dimension of the pole 12 can be greatly improved and reduced, thereby facilitating the improvement of the energy density of the battery cell 10.

[0192] In one embodiment of the present invention, reference Figure 3 and Figure 4 As shown, the pole 12 may further include: a first ring 121 and a second ring 123. The first ring 121 is connected to one end of the pole body 122 facing the electrode assembly 13, and the first ring 121 extends radially outward from the pole body 122 and extends circumferentially from the pole body 122 to form a ring; the second ring 123 is connected to the other end of the pole body 122 away from the electrode assembly 13, and the second ring 123 extends radially outward from the pole body 122 and extends circumferentially from the pole body 122 to form a ring.

[0193] A surface of the first ring 121 on one side facing the electrode assembly 13 may be flush with a surface of the pole body 122 on one side facing the electrode assembly 13, the shape of the first ring 121 may match the shape of the pole body 122, the first ring 121 and the pole body 122 may be separately provided or integrally formed, the material of the first ring 121 may be the same as or different from the material of the pole body 122, the axial thickness of the first ring 121 on the pole body 122 may be reasonably set according to the installation and assembly requirements of the pole 12, optionally, the first ring 121 may be formed by flanging along the radial outward direction of the pole body 122 at one end of the pole body 122 facing the electrode assembly 13.

[0194] A side surface of the second ring 123 facing the electrode assembly 13 can be arranged flush with a side surface of the pole body 122 facing away from the electrode assembly 13, the shape of the second ring 123 can match the shape of the pole body 122, the second ring 123 and the pole body 122 can be separately arranged or integrally formed, the material of the second ring 123 can be the same as or different from the material of the pole body 122, and the axial thickness of the second ring 123 in the pole body 122 can be reasonably set according to the installation and assembly requirements of the pole 12, optionally, the second ring 123 can be formed by flanging the end of the pole body 122 away from the electrode assembly 13 along the radial outward direction of the pole body 122.

[0195] In this embodiment, a first ring 121 and a second ring 123 are respectively provided at both ends of the pole body 122. The first ring 121 and the second ring 123 can improve the structural strength of the pole body 122 to a certain extent, so that the overall structural strength of the pole 12 is better, so that the pole 12 is more stable and reliable when connected and fixed with the pole ear 132, and the pole 12 can better participate in the power transmission operation of the battery cell 10. The first ring 121 and the second ring 123 can cooperate with the pole body 122 to form a slot structure, so as to facilitate the installation and fixation of the pole 12 in the battery cell 10. The first ring 121 and the second ring 123 have a simple structure and are easy to use.

[0196] In some embodiments of the present invention, Figure 3 As shown, the battery cell 10 may further include: a matching block 14 , which is disposed in the connecting hole 1223 , and the tab 132 is abutted between the matching block 14 and the first inclined surface 12211 .

[0197] The shape of the matching block 14 can match the connection hole 1223 and the first inclined surface 12211. The matching block 14 can be made of the same material as the pole 12. The matching block 14 can be fixedly connected to the pole body 122. The matching block 14 can also be fixedly connected to the pole body 122 and the pole ear 132. When the pole ear 132 is welded to the pole 12, the matching block 14 is placed in the connection hole 1223, and the side surface of the matching block 14 facing the first inclined surface 12211 cooperates with the first inclined surface 12211 to clamp and fix the pole ear 132.

[0198] In this embodiment, a matching block 14 is arranged in the connection hole 1223 to cooperate with the first inclined surface 12211 to clamp the pole lug 132, so that the pole lug 132 can be stably abutted and fixed on the first inclined surface 12211 under the action of the matching block 14 and maintain a good abutting state, so that it is more convenient to weld the pole lug 132 to the pole 12. The matching block 14 is arranged in the connection hole 1223, which can further strengthen the structure of the pole 12. At the same time, the matching block 14 can have a certain shielding effect on the opening of the end of the connection hole 1223 facing the electrode assembly 13, so that it can have a certain sealing effect on the pole 12, reduce the possibility of electrolyte leakage in the battery cell 10 at the connection hole 1223 of the pole 12, and make the battery cell 10 have good stability.

[0199] In one embodiment of the present invention, Figure 3 and Figure 6 As shown, the matching block 14 has a second inclined surface 141 parallel to the first inclined surface 12211 , and the tab 132 can abut between the first inclined surface 12211 and the second inclined surface 141 .

[0200] The second inclined surface 141 may be a plane or a curved surface. In the axial direction of the pole 12, one end of the second inclined surface 141 facing the electrode assembly 13 may be flush with one end of the first inclined surface 12211 facing the electrode assembly 13, and one end of the second inclined surface 141 facing away from the electrode assembly 13 may be flush with one end of the first inclined surface 12211 facing away from the electrode assembly 13 or be located within the extension range of the first inclined surface 12211. Optionally, in this embodiment, the second inclined surface 141 and the first inclined surface 12211 are both planes.

[0201] A second inclined surface 141 parallel to the first inclined surface 12211 is provided on the matching block 14, so that the spacing between the first inclined surface 12211 and the second inclined surface 141 in the extension direction perpendicular to the first inclined surface 12211 can always be the same, so that when the pole ear 132 and the pole 12 are welded and fixed, under the cooperation and pressing action of the second inclined surface 141 and the first inclined surface 12211, the part of the pole ear 132 falling on the first inclined surface 12211 can always remain close to and fixed with the first inclined surface 12211 in the extension direction of the first inclined surface 12211, so that the welding of the pole ear 132 and the first inclined surface 12211 is more convenient and stable, and the matching block 14 can stably and reliably press and fix the pole ear 132 through the cooperation between the second inclined surface 141 and the first inclined surface 12211.

[0202] In some examples of the present invention, reference Figure 3 As shown, in the axial direction of the connecting hole 1223 , the end surface of the matching block 14 facing the electrode assembly 13 can abut against the electrode assembly 13 .

[0203] The end face of the mating block 14 facing the electrode assembly 13 abuts against the electrode assembly 13. Specifically, the end face of the mating block 14 facing the electrode assembly 13 can be flush with the end face of the pole body 122 facing the electrode assembly 13. When the battery cell 10 is assembled, the end of the mating block 14 facing the electrode assembly 13 and the end of the pole body 122 facing the electrode assembly 13 cooperate to abut the electrode assembly 13, and one end portion of the pole ear 132 led out from the end of the electrode assembly 13 facing the pole 12 extends into the connecting hole 1223 and is clamped between the first inclined surface 12211 and the second inclined surface 141.

[0204] In this embodiment, the matching block 14 is abutted against the electrode assembly 13, which can limit and fix the electrode assembly 13 and the pole ear 132 in the axial direction of the pole 12, and has a certain pressing effect on the pole ear 132, so that the pole ear 132 can be more stably extended into the connecting hole 1223, so that the electrode assembly 13 can be more securely located in the battery cell 10 after assembly.

[0205] In one example of the present invention, the mating block 14 may be connected to the pole 12 by welding.

[0206] The matching block 14 is welded to the pole 12 . For example, the pole ear 132 and the pole 12 can be welded and fixed by ultrasonic welding, laser welding, resistance heat melting welding or other welding methods.

[0207] In this embodiment, the matching block 14 and the pole 12 are fixed by welding, and the connection is convenient and reliable, so that the matching block 14 can stably and reliably cooperate with the connecting protrusion 1221 to clamp and fix the pole ear 132, so that the connection and fixation of the pole ear 132 and the pole 12 are more stable and convenient.

[0208] In some examples of the present invention, Fig. 9 As shown, a supporting protrusion 1222 may be formed on the peripheral wall of the connecting hole 1223 , the supporting protrusion 1222 and the first inclined surface 12211 are arranged at intervals in the circumferential direction of the connecting hole 1223 , and one end of the matching block 14 is supported on the supporting protrusion 1222 .

[0209] A supporting protrusion 1222 is formed on the peripheral wall of the connecting hole 1223. Specifically, the supporting protrusion 1222 may be an arc-shaped protrusion, a rectangular protrusion, a polygonal protrusion, etc. The supporting protrusion 1222 may extend radially inwardly along the connecting hole 1223, such as Fig. 9 As shown, the side surface of the support protrusion 1222 facing the electrode assembly 13 in the axial direction of the connecting hole 1223 can be arranged flush with the side surface of the pole body 122 facing the electrode assembly 13, and the side surface of the support protrusion 1222 away from the electrode assembly 13 can support and fix the matching block 14 at one end in the radial direction of the connecting hole 1223, and the side surface of the support protrusion 1222 supporting and abutting the matching block 14 can be arranged according to the shape of the surface of the matching block 14 facing the electrode assembly 13 to support and fix the matching block 14.

[0210] In this embodiment, the support protrusion 1222 and the first inclined surface 12211 are arranged at intervals in the circumferential direction of the connecting hole 1223, that is, there is a distance between one end of the support protrusion 1222 facing the first inclined surface 12211 and one end of the first inclined surface 12211 facing the support protrusion 1222 in the radial direction of the connecting hole 1223. During assembly, the pole ear 132 can extend into the connecting hole 1223 from the space defined by the support protrusion 1222 and the first inclined surface 12211 in the radial direction of the connecting hole 1223, and the matching block 14 is placed in the connecting hole 1223 to press and fix the pole ear 132 toward the first inclined surface 12211, and one end of the matching block 14 is matched and fixed with the support protrusion 1222.

[0211] In this embodiment, a supporting protrusion 1222 is provided in the connecting hole 1223 to support and fix the matching block 14, so that when the matching block 14 is assembled with the pole 12, the supporting protrusion can play a good supporting and limiting role for the matching block 14, and reduce the possibility of excessive downward pressure of the matching block 14 toward the first inclined surface 12211, so that the matching block 14 and the first inclined surface 12211 can better cooperate to clamp and fix the pole ear 132, and the supporting protrusion 1222 can further improve the structural strength of the pole 12 to a certain extent, so that the structural stability of the pole 12 is better.

[0212] In one example of the present invention, Fig. 9As shown, a side surface of the support protrusion 1222 facing the electrode assembly 13 and a side surface of the support protrusion 1222 facing the first inclined surface 12211 may be connected in an arc.

[0213] A side surface of the support protrusion 1222 facing the electrode assembly 13 is connected to a side surface of the support protrusion 1222 facing the first slope 12211 by an arc. The arc may be a semicircular arc, a quarter circular arc, etc. The radius of the arc may be reasonably set according to the need for the pole ear 132 to extend into the connecting hole 1223 and the need for fixing the matching block 14 to the support protrusion 1222.

[0214] In this embodiment, the side surface of the support protrusion 1222 facing the electrode assembly 13 is connected in an arc with the side surface of the support protrusion 1222 facing the first inclined surface 12211, which can reduce the possibility of friction and damage between the pole ear 132 and the support protrusion 1222 when extending from between the support protrusion 1222 and the connecting protrusion 1221 into the connecting hole 1223, so that the pole ear 132 can be connected and assembled with the pole column 12 more easily and conveniently.

[0215] In one example of the present invention, reference Figure 3 and Fig. 9 As shown, the angles between the first inclined surface 12211 and the second inclined surface 141 and the first plane perpendicular to the axis of the connecting hole 1223 can be 0°-60°.

[0216] For example, the angles between the first slope 12211 and the second slope 141 and the first plane perpendicular to the axis of the connecting hole 1223 may be 10°, 20°, 30°, 40°, 50°, 60°, etc.

[0217] In this embodiment, the angle between the first bevel 12211 and the second bevel 141 and the first plane perpendicular to the axis of the connecting hole 1223 is limited to between 0° and 60°, so that the angle between the first bevel 12211 and the first plane and the angle between the second bevel 141 and the first plane form an acute angle and are within a smaller range, so that the first bevel 12211 and the second bevel 141 are inclined more gently in the radial direction of the connecting hole 1223. When welding the pole ear 132 and the pole 12, since the welding direction of the welding equipment is perpendicular to the extension direction of the first bevel 12211 and the second bevel 141, the welding equipment can also be inclined at a smaller angle to extend into the connecting hole 1223 for welding, thereby better reducing the interference of the hole wall of the connecting hole 1223 on the welding equipment, clamps, etc., making it more convenient and easy to weld and fix the pole ear 132 and the pole 12.

[0218] In some specific embodiments of the present invention, the angles between the first inclined surface 12211 and the second inclined surface 141 and the first plane are 0°-20°.

[0219] For example, the angle between the first slope 12211 and the second slope 141 and the first plane perpendicular to the axis of the connecting hole 1223 can be 2°, 4°, 6°, 8°, 10°, 12°, 14°, 16°, 18°, etc.

[0220] In the present embodiment, the angle between the first bevel 12211, the second bevel 141 and the first plane is further limited to between 0° and 20°, so that the first bevel 12211 and the second bevel 141 can extend more smoothly along the radial direction of the connecting hole 1223, and the first bevel 12211 and the second bevel 141 can better face the opening of the side of the connecting hole 1223 away from the electrode assembly 13, so that welding equipment, clamps, etc. can more easily, conveniently and quickly reach the welding position of the first bevel 12211 and the second bevel 141, making the welding and fixing of the pole ear 132 and the pole 12 more convenient and efficient.

[0221] In one example of the present invention, reference Fig. 9 As shown, the other end of the matching block 14 can extend to the other side wall of the connecting hole 1223 opposite to the supporting protrusion 1222 .

[0222] The other end of the mating block 14 extends to the other side wall of the connecting hole 1223 opposite to the support protrusion 1222. Specifically, in the radial direction of the connecting hole 1223, one end of the mating block 14 can extend to the side wall of the connecting hole 1223 on which the support protrusion 1222 is formed, and the other end of the mating block 14 can extend to the other side wall of the connecting hole 1223 opposite to the support protrusion 1222.

[0223] In this embodiment, by extending the other end of the matching block 14 to the other side wall of the connection hole 1223 opposite to the support protrusion 1222, the matching block 14 and the support protrusion 1222 can cooperate to seal the connection hole 1223 well, so that the end of the pole ear 132 extending into the connection hole 1223 can be relatively airtightly located between the first inclined surface 12211 and the second inclined surface 141, thereby effectively reducing the probability of the pole ear 132 and the first inclined surface 12211 being in contact with the external atmosphere through the connection hole 1223, making the electrical connection between the pole ear 132 and the pole 12 more stable and reliable. The matching block 14 and the side wall of the connection hole 1223 can form a good abutment and fixing effect, so that the matching block 14 can better play a role in structural reinforcement of the pole 12, making the overall structure of the pole 12 more stable and firm.

[0224] In some specific embodiments of the present invention, Figure 3 and Fig. 9 As shown, the mating block 14 , the pole ear 132 and the pole 12 may be welded and connected as a whole.

[0225] After the matching block 14 is assembled with the pole lug 132 and the pole 12, the matching block 14 can be welded and fixed to the pole body 122, the pole lug 132 can be welded and fixed to the connecting protrusion 1221 of the pole 12, and the pole lug 132 can also be welded and fixed to the matching block 14 and the connecting protrusion 1221. When the matching block 14 is welded with the pole lug 132 and the connecting protrusion 1221, the welding equipment can weld the matching block 14, the pole lug 132 and the connecting protrusion 1221 together from the side of the matching block 14 away from the pole lug 132, and the matching block 14, the pole lug 132 and the connecting protrusion 1221 can be welded and connected by a single weld.

[0226] In this embodiment, the matching block 14 is welded together with the pole lug 132 and the pole 12 to make the connection and fixation between the matching block 14 and the pole lug 132 and the pole 12 more firmly and reliably, and the matching block 14 and the pole 12 can be fixed to the pole lug 132 more firmly.

[0227] In one embodiment of the present invention, the material of the matching block 14 can be the same as the material of the pole 12 .

[0228] For example, when the pole 12 is made of copper, the matching block 14 may also be made of copper; when the pole 12 is made of aluminum alloy, the matching block 14 may also be made of aluminum alloy, and so on.

[0229] In this embodiment, the material of the matching block 14 is set to be the same as that of the pole 12, so that the matching block 14 and the pole 12 can be welded and fixed more conveniently, the welding is more firm, and the welding effect is better.

[0230] In some embodiments of the present invention, Figure 3 As shown, the active material coating portion 131 includes a current collector and an active material layer arranged on the current collector, the pole ear 132 is electrically connected to the current collector, the pole ear 132 includes a plurality of pole ear sheets, the plurality of pole ear sheets converge near the current collector to form a first gathering portion 1321, and the plurality of pole ear sheets converge and connect to form a second gathering portion 1322 away from the current collector, the first gathering portion 1321 connects the second gathering portion 1322 and the active material coating portion 131, and at least a portion of the second gathering portion 1322 extends into the connecting hole 1223 and is connected to the first inclined surface 12211.

[0231] The tab 132 includes a plurality of layers of tab sheets. For example, the tab sheet may have three layers, four layers, five layers, six layers, seven layers, eight layers, etc.

[0232] The tab 132 is led out from the current collector, refer to Figure 3As shown, a plurality of pole tabs converge from the active material coating portion 131 toward the surface of one side of the pole 12 toward the connection hole 1223 of the pole 12, and the spacing between the plurality of pole tabs gradually decreases until they are stacked and abutted against each other. During the processing of the pole tab 132, the pole tab 132 is pre-welded at the stacked and abutted portion to form a second gathered portion 1322, and in the direction from the active material coating portion 131 toward the pole 12, a portion with a certain spacing between the plurality of pole tabs and a portion of the stacked and abutted portion of the pole tab 132 that is not pre-welded form a first gathered portion 1321.

[0233] When the pole tab 132 is welded to the pole 12 , the second retracted portion 1322 of the pole tab 132 can partially extend into the connection hole 1223 and be connected and fixed to the first inclined surface 12211 , or the second retracted portion 1322 of the pole tab 132 can fully extend into the connection hole 1223 and be connected and fixed to the first inclined surface 12211 .

[0234] In this embodiment, a plurality of pole tabs are gathered together to form a pole tab 132, so that the pole tab 132 and the pole 12 can be reliably connected and fixed via the second gathering portion 1322 when being welded and fixed, and the second gathering portion 1322 can have a smaller thickness, so that the pole tab 132 can be more easily and conveniently inserted into the connecting hole 1223 and fixed to the first inclined surface 12211.

[0235] Optionally, the position where the first gathering portion 1321 and the second gathering portion 1322 are connected can be arranged corresponding to the opening of the connection hole 1223 on one side facing the electrode assembly 13. That is, on the projection plane perpendicular to the axial direction of the pole 12, the projection of the connection position of the first gathering portion 1321 and the second gathering portion 1322 on the projection plane is located within the projection range of the opening of one side of the connection hole 1223, and when the pole lug 132 is connected and assembled with the pole 12, the second gathering portion 1322 extends from the opening of the connection hole 1223 on one side of the opening of the connection hole 1223 into the connection hole 1223 and is connected and fixed to the pole 12.

[0236] In this way, the second retracted portion 1322 can extend into the connecting hole 1223 at a shorter distance, thereby reducing the redundancy of the tab 132 and lowering the cost, thereby improving the energy density of the battery cell 10 to a certain extent.

[0237] In one embodiment of the present invention, reference Figure 3 and Fig. 9 As shown, at least a portion of the first gathered portion 1321 may extend into the connecting hole 1223 and extend along the first inclined surface 12211 .

[0238] At least a portion of the first gathering portion 1321 extends into the connection hole 1223 and extends along the first inclined surface 12211 , that is, the first gathering portion 1321 may partially extend into the connection hole 1223 , or the first gathering portion 1321 may fully extend into the connection hole 1223 .

[0239] In this embodiment, at least a portion of the first retracted portion 1321 is extended into the connecting hole 1223 and along the first inclined surface 12211, so that the pole ear 132 and the first inclined surface 12211 have a longer abutment and fixing dimension, so that the connection and fixation between the pole ear 132 and the first inclined surface 12211 is more stable and reliable, and the pole ear 132 can occupy less space in the shell 11, so that the active material coating portion 131 can be increased in size to improve the energy density of the battery cell 10, and the redundancy of the pole ear 132 in the shell 11 can be further reduced, so that the probability of short circuit between the pole ear 132 and the active material coating portion 131 is further reduced, so that the use of the battery cell 10 is more stable and reliable.

[0240] In one embodiment of the present invention, a ratio of a width of the second gathered portion 1322 overlapping the first inclined surface 12211 to a width of the first inclined surface 12211 is greater than or equal to 0.5.

[0241] The overlap width between the second gathered portion 1322 and the first inclined surface 12211 refers to the length dimension of the second gathered portion 1322 extending along the first inclined surface 12211, and the width of the first inclined surface 12211 refers to the length dimension of the first inclined surface 12211 extending in the axial direction of the pole 12. Figure 4 and Figure 5 As shown, Figure 4 Where L5 represents the width of the first inclined surface 12211, Figure 5 L6 represents the overlapping width, and the ratio of the overlapping width of the second gathered portion 1322 on the first inclined surface 12211 to the width of the first inclined surface 12211 is greater than or equal to 0.5, for example, the ratio can be 0.5, 0.6, 0.7, 0.8, 0.9, 1, etc.

[0242] In this embodiment, the width of the second gathering portion 1322 overlapping the first inclined surface 12211 on the first inclined surface 12211 and the width of the first inclined surface 12211 are limited to be greater than or equal to 0.5, so that the second gathering portion 1322 and the first inclined surface 12211 can have a sufficient overlapping length so that the second gathering portion 1322 can be stably and firmly connected to the first inclined surface 12211, thereby making the connection between the pole ear 132 and the pole 12 stably and firmly fixed.

[0243] In some examples of the present invention, the ratio of the overlapping width between the second gathered portion 1322 and the first inclined surface 12211 to the width of the first inclined surface 12211 is 0.8-1.2.

[0244] The ratio of the overlapping width between the second gathered portion 1322 and the first inclined surface 12211 to the width of the first inclined surface 12211 is 0.8-1.2, for example, the ratio may be 0.8, 0.9, 1, 1.1, 1.2, and so on.

[0245] In this embodiment, the ratio of the overlapping width of the second gathering portion 1322 and the first inclined surface 12211 to the width of the first inclined surface 12211 is further limited, so that the second gathering portion 1322 and the first inclined surface 12211 can be better overlapped and matched, and the second gathering portion 1322 can maintain a larger overlapping surface and overlapping length with the first inclined surface 12211, so that the connection and fixation between the pole ear 132 and the pole 12 is more stable and reliable, and the redundant size of the first inclined surface 12211 or the second gathering portion 1322 can be reduced, so that the second gathering portion 1322 and the first inclined surface 12211 can be more conveniently matched and abutted, thereby reducing the space occupied by the pole ear 132 and the pole 12 in the battery cell 10 to a certain extent.

[0246] In one embodiment of the present invention, a plurality of tab sheets of the tab 132 may be pre-welded and connected at the second gathered portion 1322 .

[0247] Before the pole tab 132 is welded and assembled with the pole post 12, the multiple pole tab sheets are stacked and gathered to form a second gathered portion 1322. The welding equipment pre-welds the multiple pole tab sheets at the second gathered portion 1322 so that the multiple pole tab sheets at the second gathered portion 1322 of the pole tab 132 facing the pole post 12 are connected. Optionally, the multiple pole tab sheets at the second gathered portion 1322 can be welded and connected by ultrasonic pre-welding.

[0248] It can be understood that the pre-welding width required for pre-welding of multiple layers of pole tabs is relatively small, and the pre-welding connection of multiple pole tabs of the pole tab 132 at the second gathering portion 1322 can shorten the size of the pole tab 132 to a certain extent during processing and manufacturing, thereby making the pole tab 132 shorter and smaller, and further making the height dimension of the pole column 12 fixed with the pole tab 132 can be set shorter, thereby further improving the energy density of the battery cell 10.

[0249] In this embodiment, by pre-welding the second gathered portion 1322 of the pole lug 132, the interlayer gap can be reduced, so that the fluffy multiple pole lug sheets form a plate structure with a certain rigidity in the second gathered portion 1322, so that the second gathered portion 1322 of the pole lug 132 is not easy to move relative to each other and stretch during the overall movement or bending process, so that the second gathered portion 1322 has better integrity, and the second gathered portion 1322 can be more stably bent toward the first inclined surface 12211 or welded to the first inclined surface 12211, etc., which effectively reduces the possibility of cracking when the pole lug 132 is welded to the pole column 12, so that the welding and fixing of the pole lug 132 to the pole column 12 is more stable and reliable. Optionally, multiple pole lug sheets can also be connected and fixed in the second gathered portion 1322 by means of conductive adhesive bonding, etc., which are not listed here one by one.

[0250] In one embodiment of the present invention, the pre-welding width of the second gathered portion 1322 may be greater than or equal to 1.5 mm.

[0251] In this embodiment, the pre-welding width of the second gathered portion 1322 is greater than or equal to 1.5 mm. For example, the pre-welding width may be 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, etc.

[0252] In this embodiment, the pre-welding width of the second gathered portion 1322 is set to be greater than or equal to 1.5 mm, so that the pre-welding of the pole lug 132 has a sufficient width dimension, so that when the pole lug 132 is bent or abutted against the first inclined surface 12211, etc., the overall structural strength of the pole lug 132 at the pre-welding position is sufficient to resist the tensile deformation and other stresses generated by the pole lug 132, so that the pole lug 132 maintains a good and stable structural state during assembly, thereby making the welding and fixing operation of the pole lug 132 and the pole post 12 more stable and smooth.

[0253] In some embodiments of the present invention, Fig.13 As shown, the battery cell 10 may further include: a cover plate 15 , the cover plate 15 covers an end of the connection hole 1223 away from the electrode assembly 13 , and the cover plate 15 is sealed and connected to the pole 12 .

[0254] The cover plate 15 can be made of copper, zinc, aluminum, copper-aluminum alloy, etc. The shape of the cover plate 15 can be adapted to the cross-sectional shape of the connection hole 1223, and the thickness of the cover plate 15 can be reasonably set as needed. When the battery cell 10 is assembled, after the tab 132 is assembled with the pole 12 and the matching block 14, the cover plate 15 is arranged at the end of the connection hole 1223 away from the electrode assembly 13.

[0255] In this embodiment, a cover plate 15 is provided to seal the pole 12, and the matching block 14 and the pole ear 132 structure located in the connection hole 1223 can be reliably sealed, so that the pole ear 132 and the pole 12 can be in a good closed environment after being welded and fixed, so that the pole ear 132 and the pole 12 can be stably and well connected during long-term use. The cover plate 15 can cooperate with the pole 12 to transmit electricity, and the cover plate 15 can form a good electrical connection surface, so that the battery cell 10 can be more conveniently connected to the electrical connector when in use.

[0256] In one embodiment of the present invention, reference Fig.13 and Figure 4 As shown, a groove 1224 may be formed on the surface of one side of the pole 12 facing away from the electrode assembly 13 , a connecting hole 1223 is formed on the inner side of the groove 1224 and passes through the bottom wall of the groove 1224 , and the cover plate 15 is disposed in the groove 1224 .

[0257] The shape of the groove 1224 can match the shape structure of the periphery of the cover plate 15, and the depth of the groove 1224 can be adapted to the thickness of the cover plate 15. The axis of the groove 1224 can be colinear with the axis of the connecting hole 1223. When the cover plate 15 is assembled with the pole 12, the surface of one side of the cover plate 15 facing the electrode assembly 13 abuts against the bottom of the groove 1224, and the periphery of the cover plate 15 abuts against the wall of the groove 1224.

[0258] In this embodiment, the groove 1224 is provided on the pole 12, so that the cover plate 15 and the pole 12 can be positioned more conveniently when being fixed, and the connection and fixation are more stable and reliable.

[0259] In some examples of the present invention, reference Fig.13 and Figure 4 As shown, in the direction from the electrode assembly 13 toward the cap plate 15 , the side wall of the groove 1224 may extend outwardly in a radial direction of the connection hole 1223 .

[0260] The side wall of the groove 1224 extends outwardly along the radial direction of the connecting hole 1223, and the inclination angle of the side wall can be reasonably set according to the installation and fixation requirements of the cover plate 15. The extension direction of the side wall of the groove 1224 can be consistent with the extension direction of the periphery of the cover plate 15, and the side wall of the groove 1224 can abut against the peripheral wall of the cover plate 15.

[0261] In this embodiment, the side wall of the groove 1224 is extended outwardly along the radial direction of the connection hole 1223, which can play a certain guiding role when the cover plate 15 and the pole 12 are assembled, so that the cover plate 15 can be more conveniently fixed in the groove 1224, and the structure is simple and easy to assemble. When the cover plate 15 and the pole 12 are welded, the peripheral edge of the cover plate 15 and the inclined side wall of the groove 1224 can increase the welding width during welding, so that the cover plate 15 and the pole 12 have a higher welding quality, and the cover plate 15 and the pole 12 can have a better welding sealing effect.

[0262] In some examples of the present invention, reference Fig.13 and Figure 4 As shown, a surface of the cover plate 15 facing away from the electrode assembly 13 may be flush with an end surface of the electrode column 12 facing away from the electrode assembly 13 .

[0263] After the cover plate 15 is assembled with the pole 12, the cover plate 15 can cooperate with the pole 12 to form a continuous plane on the side of the pole 12 facing away from the electrode assembly 13. Specifically, the side surface of the second ring 123 facing away from the electrode assembly 13 can be flush with the side surface of the pole 12 facing away from the electrode assembly 13 and the side surface of the cover plate 15 facing away from the electrode assembly 13. The cover plate 15 can be bonded or welded to the pole 12.

[0264] In this embodiment, the side surface of the cover plate 15 facing away from the electrode assembly 13 is flush with the end surface of the pole 12 facing away from the electrode assembly 13, so that the cover plate 15 and the pole 12 can cooperate to form a continuous plane, thereby reducing the space occupied by the cover plate 15 to a certain extent and increasing the electrical connection surface of the pole 12 of the battery cell 10, so that the energy density of the battery cell 10 can be improved to a certain extent, and the battery cell 10 can be more conveniently electrically connected to the electrical connector through the end of the pole 12 facing away from the electrode assembly 13.

[0265] Reference below Figure 3-Figure 8 The preparation method of the battery cell 10 according to the embodiment of the second aspect of the present invention is described. The battery cell 10 is the battery cell 10 according to the embodiment of the first aspect of the present invention. The preparation method includes: extending one end of the pole ear 132 into the connecting hole 1223 of the pole column 12; making one side surface of one end of the pole ear 132 in the thickness direction abut against the first inclined surface 12211; and welding one end of the pole ear 132 to the first inclined surface 12211.

[0266] One end of the pole lug 132 refers to the end of the pole lug 132 that is away from the electrode assembly 13, that is, the second folded portion 1322 of the pole lug 132. The pole lug 132 is led out from the electrode assembly 13, and one end of the pole lug 132 extends toward and into the connection hole 1223 of the pole column 12. The pole lug 132 is composed of multiple layers of pole lug sheets, which are stacked. When the pole lug 132 extends into the connection hole 1223 and abuts against the first inclined surface 12211, one side surface of the pole lug 132 in the stacking direction of the pole lug sheets abuts against the first inclined surface 12211. The first inclined surface 12211 is an inclined surface that is inclined radially outward in the axial direction of the pole column 12. After the pole lug 132 extends into the connection hole 1223, it bends and tilts toward the first inclined surface 12211 to abut against the first inclined surface 12211.

[0267] According to the preparation method of the battery cell 10 of the embodiment of the present invention, by extending the pole ear 132 into the connection hole 1223 of the pole post 12 and abutting against the first inclined surface 12211 and welding it to be fixed, the pole ear 132 can occupy less space in the battery cell 10, reducing the weight of the pole ear 132 and the pole post 12, so that the energy density of the battery cell 10 can be greatly improved.

[0268] In some embodiments of the present invention, a side surface of one end of the pole ear 132 in the thickness direction is abutted against the first inclined surface 12211, including: placing the matching block 14 into the connecting hole 1223, and pressing one end of the pole ear 132 toward the first inclined surface 12211 through the matching block 14 until it abuts against the first inclined surface 12211.

[0269] When the matching block 14 is placed in the connecting hole 1223, one end of the pole ear 132 is located between the second inclined surface 141 and the first inclined surface 12211 of the matching block 14. As the matching block 14 moves toward the electrode assembly 13, the pole ear 132 is gradually tilted and bent toward the first inclined surface 12211 under the pushing action of the second inclined surface 141 and finally abuts against the first inclined surface 12211.

[0270] In this embodiment, the matching block 14 presses one end of the tab 132 toward the first inclined surface 12211 , so that the tab 132 can be stably and reliably fitted and abutted against the first inclined surface 12211 under the action of the matching block 14 , thereby making it easier and more convenient for the tab 132 to abut and fix against the first inclined surface 12211 .

[0271] In one embodiment of the present invention, the preparation method further includes: sealing the cover plate 15 at the end of the connection hole 1223 away from the electrode assembly 13 , and welding the cover plate 15 to the electrode column 12 .

[0272] A groove 1224 is formed at one end of the pole 12 away from the electrode assembly 13 , and the cover plate 15 is assembled in the groove 1224 and covers the connection hole 1223 . The cover plate 15 is assembled with the pole 12 and then welded to the pole 12 .

[0273] In this embodiment, the cover plate 15 is welded and sealed to the end of the pole 12 away from the electrode assembly 13, which can increase the electrical connection surface of the pole 12 and seal the electrode assembly 13 and the pole ear 132 in the shell 11, so that the battery cell 10 is more convenient to connect with the electrical connector when in use, and the battery cell 10 is more stable to use.

[0274] In some embodiments of the present invention, before extending one end of the pole tab 132 into the connection hole 1223 of the pole 12, the preparation method further includes: connecting a plurality of pole tab sheets of the pole tab 132 into one body by pre-welding.

[0275] A plurality of tab sheets are stacked to form a tab 132 , and the plurality of tab sheets can be connected as a whole by ultrasonic pre-welding to form one end of the tab 132 .

[0276] In this embodiment, the multiple tab pieces of the tab 132 are connected as one by pre-welding, which can reduce the gap between the tab pieces and make one end of the tab 132 more compact, thereby facilitating the subsequent operation of extending the tab 132 into the connection hole 1223, etc.

[0277] Reference below Figure 2-Figure 13 A battery 100 according to an embodiment of the third aspect of the present invention is described.

[0278] like Figure 2-Figure 13 As shown, a battery 100 according to an embodiment of the present invention includes a battery cell 10 according to an embodiment of the first aspect of the present invention.

[0279] Other structures and operations of the battery 100 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0280] According to the battery 100 of the embodiment of the present invention, by setting the battery cell 10 of the first embodiment mentioned above, a connection hole 1223 penetrating the pole 12 is set on the pole 12, and at least a part of the inner wall of the connection hole 1223 is formed as a first inclined surface 12211, and one end of the pole lug 132 extends into the connection hole 1223 and is fixedly connected to the first inclined surface 12211, so that the pole lug 132 occupies less space in the battery cell 10, reducing the weight of the pole lug 132 and the pole 12, so that the energy density of the battery cell 10 can be greatly improved.

[0281] Reference below Figure 1-Figure 13 An electric device 1000 according to an embodiment of a fourth aspect of the present invention is described.

[0282] like Figure 1-Figure 13 As shown, a battery 100 according to an embodiment of the present invention includes a battery cell 10 according to an embodiment of the third aspect of the present invention.

[0283] Other structures and operations of the electric device 1000 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0284] According to the electrical device 1000 of the embodiment of the present invention, by setting the battery 100 of the third aspect embodiment mentioned above, a connection hole 1223 penetrating the pole 12 is set on the pole 12, and at least a part of the inner wall of the connection hole 1223 is formed as a first inclined surface 12211, and one end of the pole lug 132 extends into the connection hole 1223 and is fixedly connected to the first inclined surface 12211, so that the pole lug 132 and the pole 12 occupy less space in the battery cell 10, reducing the weight of the pole lug 132 and the pole 12, so that the energy density of the battery cell 10 can be greatly improved.

[0285] The following will refer to Figure 1-Figure 13 An electric device 1000 according to two specific embodiments of the present invention is described.

[0286] Embodiment 1,

[0287] like Figure 1 and Figure 2 As shown, the electric device 1000 according to the fourth aspect of the present invention is a vehicle, and the electric device 1000 includes the battery 100 according to the second aspect of the present invention, and the battery 100 is used to provide or store electric energy.

[0288] like Figure 3-Figure 8 and Fig.13 As shown, the battery 100 includes a housing 11, a pole 12, a cover plate 15, a matching block 14, an electrode assembly 13 and a pole 12. The housing 11 has a housing cavity 112 and a mounting hole, two mounting holes are provided and communicated with the housing cavity 112, the electrode assembly 13 is arranged in the housing cavity 112, the electrode assembly 13 includes a pole piece and a diaphragm, the pole piece has a current collector and an active material layer, the active material layer is coated on the current collector to form an active material coating portion 131 of the electrode assembly 13, the portion of the current collector not coated with the active material layer protrudes from the active material coating portion 131 to form a pole ear piece, there are a plurality of pole ear pieces, the plurality of pole ear pieces converge toward one end of the mounting hole to form a pole ear 132, one end of the pole ear 132 facing the active material coating portion 131 forms a first converged portion 1321, the pole ear 132 is stacked toward one end of the pole 12 to form a second converged portion 1322, and the pole ear 132 includes a positive pole ear 132 and a negative pole ear 132.

[0289] There are two poles 12, which are arranged in one-to-one correspondence with the mounting holes, and the poles 12 are inserted into the mounting holes. The pole 12 includes a pole body 122, a first ring 121, and a second ring 123. The pole body 122 is a hollow annular structure. The first ring 121 is integrally formed with the pole body 122 and is located in the accommodating cavity 112. The first ring 121 is arranged around the outer peripheral surface of the pole body 122. The surface of one side of the first ring 121 facing the electrode assembly 13 is flush with the surface of one side of the pole body 122 facing the electrode assembly 13, and the other side abuts against the inner wall of the shell 11. The second ring 123 is formed in two parts with the pole body 122 and is located outside the shell 11. The second ring 123 is arranged around the outer peripheral surface of the pole body 122. The surface of one side of the second ring 123 away from the electrode assembly 13 is flush with the surface of one side of the pole body 122 away from the electrode assembly 13, and the other side abuts against the shell 11.

[0290] A connecting protrusion 1221 is formed on the inner wall of the pole 12, and the connecting protrusion 1221 cooperates with the pole body 122 to form a connecting hole 1223. The side surface of the connecting protrusion 1221 facing the electrode assembly 13 is flush with the side surface of the pole 12 and the first ring 121 facing the electrode assembly 13. The side surface of the connecting protrusion 1221 facing away from the electrode assembly 13 is formed with a first inclined surface 12211, and the first inclined surface 12211 extends obliquely from one end facing the electrode assembly 13 to the end facing away from the electrode assembly 13 toward the inner wall surface of the pole 12.

[0291] The mating block 14 is arranged in the connecting hole 1223 and has a second inclined surface 141 parallel to the first inclined surface 12211. The mating block 14 and the connecting protrusion 1221 are arranged radially spaced apart from each other in the connecting hole 1223. The mating block 14 abuts against the hole wall of the connecting hole 1223. One end of the pole ear 132 extends into the connecting hole 1223 and is clamped and fixed between the first inclined surface 12211 and the second inclined surface 141.

[0292] A groove 1224 is formed at one end of the pole 12 away from the electrode assembly 13 , a connecting hole 1223 passes through the bottom of the groove 1224 , and the notch of the groove 1224 gradually increases. The cover plate 15 is covered in the groove 1224 and covers the connecting hole 1223 .

[0293] When the battery cell 10 is assembled, the multiple pole tabs in the electrode assembly 13 are pre-welded to form a whole, the electrode assembly 13 is placed in the accommodating cavity 112 of the shell 11, the pole 12 is inserted into the mounting hole and fixed to the shell 11 through the first ring 121 and the second ring 123 and abuts against the electrode assembly 13, one end of the pole tab 132 extends into the connecting hole 1223, the matching block 14 is placed in the connecting hole 1223 and moves toward the electrode assembly 13, the pole tab 132 is clamped between the first inclined surface 12211 and the second inclined surface 141 under the cooperation of the matching block 14 and the connecting protrusion 1221, the welding equipment welds the pole tab 132, the pole 12 and the matching block 14, after the welding is completed, the cover plate 15 is sealed at the groove 1224 of the pole 12 and is welded and fixed to the pole 12, thereby completing the assembly of the battery cell 10.

[0294] According to the electrical device 1000 of the embodiment of the present invention, a connection hole 1223 penetrating the pole 12 is provided on the pole 12, and at least a portion of the inner wall of the connection hole 1223 is formed as a first inclined surface 12211, and one end of the pole lug 132 extends into the connection hole 1223 and is fixedly connected to the first inclined surface 12211. This can make the pole lug 132 occupy less space in the battery cell 10, reduce the weight of the pole lug 132 and the pole 12, and thus greatly improve the energy density of the battery cell 10.

[0295] Embodiment 2:

[0296] like Figure 9-12 As shown, the structure of this embodiment is roughly the same as that of the first embodiment, wherein the same components are marked with the same figures, and the only difference is that a supporting protrusion 1222 is formed on the inner wall of the connecting hole 1223, which is radially opposite to the connecting protrusion 1221 in the connecting hole 1223, and the matching block 14 is fixed on the supporting protrusion, and the inclination angle of the first inclined surface 12211 is further limited to between 0° and 20°, so that it can play a certain limiting role in the movement of the matching block 14, reduce the probability of the matching block 14 over-pressuring the pole lug 132, make the matching block 14 and the pole lug 132 and the pole 12 cooperate better, and the welding equipment is more convenient and easy to operate when welding the pole lug 132, the pole lug 132 and the matching block 14.

[0297] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: A housing (11) comprising a first wall (111); A pole (12) is arranged on the first wall (111), and is formed with a connection hole (1223) penetrating the pole (12), at least a portion of an inner peripheral wall of the connection hole (1223) is formed as a first inclined surface (12211), and the first inclined surface (12211) is arranged obliquely relative to the axis of the connection hole (1223); An electrode assembly (13) comprises an active material coating portion (131) and a pole lug (132), wherein the active material coating portion (131) is disposed in the shell (11), the pole lug (132) is electrically connected to the active material coating portion (131), and at least a portion of the pole lug (132) extends into the connection hole (1223) and is connected to the first inclined surface (12211).

2. The battery cell according to claim 1, characterized in that: The pole lug (132) is connected to the pole (12) by welding.

3. The battery cell according to claim 1, characterized in that: In the direction from the electrode assembly (13) toward the pole (12), the first inclined surface (12211) extends outwardly along the radial direction of the connection hole (1223).

4. The battery cell according to claim 1, characterized in that: The angle between the first inclined surface (12211) and a first plane perpendicular to the axis of the connecting hole (1223) is 0°-70°; or The angle between the first inclined surface (12211) and the first plane is 30°-60°.

5. The battery cell according to claim 1, characterized in that: The pole (12) comprises: a pole (12) body, the pole (12) body is a hollow ring, a raised connecting protrusion (1221) is provided on the inner wall surface of the pole (12) body, the pole (12) body cooperates with the connecting protrusion (1221) to define the connecting hole (1223), and the first inclined surface (12211) is formed on the connecting protrusion (1221).

6. The battery cell according to claim 5, characterized in that: In the axial direction of the connection hole (1223), at least a portion of a surface of a side of the connection protrusion (1221) that faces away from the electrode assembly (13) is formed as the first inclined surface (12211).

7. The battery cell according to claim 6, characterized in that: The first inclined surface (12211) has a welding area, and the pole ear (132) is welded to the welding area. In the axial direction of the connecting hole (1223), the thickness of the connecting protrusion (1221) at the welding area is a first thickness, and the depth of the molten pool formed at the welding area of ​​the connecting protrusion (1221) when the pole ear (132) and the connecting protrusion (1221) are welded is a first depth, and the first thickness is greater than the first depth.

8. The battery cell according to claim 7, characterized in that: A difference between the first thickness and the first depth is greater than or equal to 0.2 mm.

9. The battery cell according to claim 8, characterized in that: A difference between the first thickness and the first depth is greater than or equal to 0.5 mm.

10. The battery cell according to claim 6, characterized in that: The first inclined surface (12211) is connected to a surface of one side of the connecting protrusion (1221) facing the electrode assembly (13) in an arc shape.

11. The battery cell according to claim 6, characterized in that: A surface of one side of the connecting protrusion (1221) facing the electrode assembly (13) is flush with a surface of one side of the electrode column (12) body facing the electrode assembly (13).

12. The battery cell according to claim 6, characterized in that: The minimum width of the connection hole (1223) is greater than or equal to 3 mm.

13. The battery cell according to claim 6, characterized in that: The ratio of the minimum width of the connection hole (1223) to the thickness of the pole lug (132) is 1.5-5; or the ratio of the minimum width of the connection hole (1223) to the thickness of the pole lug (132) is 2.5-5.

14. The battery cell according to claim 6, characterized in that: The ratio of the minimum width of the connection hole (1223) to the maximum width of the connection hole (1223) is 0.3-0.5; or, the ratio of the minimum width of the connection hole (1223) to the maximum width of the connection hole (1223) is 0.35-0.

45.

15. The battery cell according to claim 5, characterized in that: The pole (12) further comprises: a first ring (121), the first ring (121) being connected to one end of the pole (12) body facing the electrode assembly (13), the first ring (121) extending radially outwards along the pole (12) body and extending circumferentially along the pole (12) body in a ring shape; A second ring (123), the second ring (123) is connected to the other end of the pole (12) body away from the electrode assembly (13), and the second ring (123) extends radially outwardly along the pole (12) body and extends circumferentially along the pole (12) body in a ring shape.

16. The battery cell according to any one of claims 1 to 15, characterized in that: Also includes: A matching block (14), the matching block (14) is arranged in the connecting hole (1223), and the pole ear (132) abuts between the matching block (14) and the first inclined surface (12211).

17. The battery cell according to claim 16, characterized in that: The matching block (14) has a second inclined surface (141) parallel to the first inclined surface (12211), and the pole ear (132) abuts between the first inclined surface (12211) and the second inclined surface (141).

18. The battery cell according to claim 17, characterized in that: In the axial direction of the connecting hole (1223), an end surface of the matching block (14) facing one end of the electrode assembly (13) abuts against the electrode assembly (13).

19. The battery cell according to claim 18, characterized in that: The matching block (14) is connected to the pole (12) by welding.

20. The battery cell according to claim 17, characterized in that: A supporting protrusion (1222) is formed on the peripheral wall of the connecting hole (1223); the supporting protrusion (1222) and the first inclined surface (12211) are arranged at intervals in the circumferential direction of the connecting hole (1223); and one end of the matching block (14) is supported on the supporting protrusion (1222).

21. The battery cell according to claim 20, characterized in that: An included angle between the first inclined surface (12211) and the second inclined surface (141) and a first plane perpendicular to the axis of the connecting hole (1223) is 0°-60°.

22. The battery cell according to claim 21, characterized in that: The angles between the first inclined surface (12211) and the second inclined surface (141) and the first plane are 0°-20°.

23. The battery cell according to claim 20, characterized in that: The other end of the matching block (14) extends to the other side wall of the connecting hole (1223) opposite to the supporting protrusion (1222).

24. The battery cell according to claim 23, characterized in that: The matching block (14), the pole ear (132) and the pole (12) are welded together as a whole.

25. The battery cell according to claim 16, characterized in that: The material of the matching block (14) is the same as that of the pole (12).

26. The battery cell according to claim 1, characterized in that: The active material coating portion (131) includes a current collector and an active material layer disposed on the current collector, the pole lug (132) is electrically connected to the current collector, the pole lug (132) includes a plurality of pole lug (132) sheets, the plurality of pole lug (132) sheets converge at a position close to the current collector to form a first gathered portion (1321), the plurality of pole lug (132) sheets converge at a position away from the current collector and are connected to form a second gathered portion (1322), the first gathered portion (1321) connects the second gathered portion (1322) and the active material coating portion (131), and at least a portion of the second gathered portion (1322) extends into the connection hole (1223) and is connected to the first inclined surface (12211).

27. The battery cell according to claim 26, characterized in that: At least a portion of the first retracted portion (1321) extends into the connecting hole (1223) and extends along the first inclined surface (12211).

28. The battery cell according to claim 26, characterized in that: The ratio of the overlapping width of the second gathered portion (1322) on the first inclined surface (12211) and the first inclined surface (12211) to the width of the first inclined surface (12211) is greater than or equal to 0.

5.

29. The battery cell according to claim 28, characterized in that: The ratio of the overlapping width between the second gathered portion (1322) and the first inclined surface (12211) to the width of the first inclined surface (12211) is 0.8-1.

2.

30. The battery cell according to claim 1, characterized in that Also includes: A cover plate (15), the cover plate (15) covers an end of the connection hole (1223) away from the electrode assembly (13), and the cover plate (15) is sealed and connected to the pole (12).

31. The battery cell according to claim 30, characterized in that: A groove (1224) is formed on a surface of one side of the pole (12) facing away from the electrode assembly (13); the connection hole (1223) is formed on the inner side of the groove (1224) and passes through the bottom wall of the groove (1224); and the cover plate (15) is arranged in the groove (1224).

32. The battery cell according to claim 31, characterized in that: In a direction from the electrode assembly (13) toward the cover plate (15), the side wall of the groove (1224) extends outwardly and obliquely along the radial direction of the connection hole (1223).

33. The battery cell according to claim 31, characterized in that A surface of one side of the cover plate (15) facing away from the electrode assembly (13) is flush with an end surface of one end of the pole (12) facing away from the electrode assembly (13).

34. A method for preparing a battery monomer, characterized in that: The battery cell is a battery cell according to any one of claims 1 to 33, and the preparation method comprises: Insert one end of the pole ear (132) into the connecting hole (1223) of the pole (12); A side surface of the one end of the pole ear (132) in the thickness direction is brought into contact with the first inclined surface (12211); The one end of the pole ear (132) is welded to the first inclined surface (12211).

35. The method for preparing a battery cell according to claim 34, characterized in that: The step of bringing a side surface of the one end of the pole ear (132) in the thickness direction into contact with the first inclined surface (12211) comprises: The matching block (14) is placed in the connecting hole (1223), and the one end of the pole ear (132) is pressed toward the first inclined surface (12211) by the matching block (14) until it abuts against the first inclined surface (12211).

36. A battery, characterized in that: Comprising a battery cell according to any one of claims 1-33.

37. An electrical device, characterized in that: A battery according to claim 36, for providing electrical energy.

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