Battery cell, battery, electric device, and energy storage device

Abstract

Provided in the embodiments of the present disclosure are a battery cell, a battery, an electric device, and an energy storage device. The battery cell comprises: a housing having an accommodating space and an opening; an electrode assembly accommodated in the accommodating space, the electrode assembly comprising electrode plates and a separator that are stacked at least in a first direction, and in a second direction, the electrode assembly having an end surface on the side close to the opening, and the electrode assembly having first side surfaces opposite each other in the first direction; an end cap covering the opening, the end cap comprising a main body portion and a protruding portion connected to the main body portion, and in a second direction, the protruding portion protruding towards the side away from the electrode assembly; a first electrode terminal arranged on the protruding portion and electrically connected to the electrode assembly; and a protective member covering part of the end surface and extending to at least one of the first side surfaces, and in the same projection plane perpendicular to the second direction, the orthographic projection of the protective member at least partially overlapping the orthographic projection of the main body portion, where the first direction is perpendicular to the second direction.

Description

Battery cell, battery, electric device and energy storage device

[0001] Cross-reference to related applications

[0002] The present disclosure is based on and claims priority to Chinese Patent Application No. 202421542731.4, filed on July 2, 2024, entitled “Battery cell, battery, electric device and energy storage device”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] Embodiments of the present disclosure relate to the technical field of battery, in particular to a battery cell, a battery, an electric device and an energy storage device. BACKGROUND

[0004] New energy batteries are increasingly widely used in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also increasingly used in the field of energy storage and the like.

[0005] A battery includes at least one battery cell. The battery cell usually includes a shell having an opening, an electrode assembly accommodated in the shell, and an end cover covering the opening. If foreign matter exists at the connection position of the end cover and the shell, the connection strength, sealing performance, and the like of the end cover and the shell can be adversely affected. Therefore, how to reduce the possibility of foreign matter entering the connection position of the end cover and the shell and thereby reduce the risk of poor connection and poor sealing is one of the research topics in the industry. SUMMARY

[0006] To solve the above technical problems, the present disclosure provides a battery cell, a battery, an electric device and an energy storage device capable of reducing the risk of foreign matter such as a separator entering the connection position of the end cover and the shell.

[0007] In a first aspect, the embodiments of the present disclosure provide a battery cell, comprising: a shell, the shell having an accommodation space and an opening; an electrode assembly, the electrode assembly being accommodated in the accommodation space, the electrode assembly comprising at least a tab and a separator stacked along a first direction, along a second direction, the electrode assembly having an end face on a side close to the opening, the electrode assembly having a first side face opposite to each other along the first direction; an end cover, the end cover covering the opening, the end cover comprising a main body portion and a protruding portion connected to the main body portion, along the second direction, the protruding portion protruding away from the electrode assembly; a first electrode terminal, the first electrode terminal being provided on the protruding portion and electrically connected to the electrode assembly; a protective member, the protective member covering part of the end face and extending to at least one first side face, and, in the same projection plane perpendicular to the second direction, the protective member and the main body portion at least partially overlap in orthographic projection, wherein the first direction and the second direction are perpendicular.

[0008] In the embodiments of the present disclosure, since the first electrode terminal is arranged on the protruding portion and electrically connected with the electrode assembly, part of the structure of the first electrode terminal can be accommodated in the protruding portion, the main body portion can be closer to the electrode assembly relative to the protruding portion, and thus the overall volume of the battery monomer can be reduced. Since the normal projection of the protection member and the main body portion at least partially overlaps in the same projection plane perpendicular to the second direction, the protection member can bind the diaphragm close to the main body portion, reduce the case that the diaphragm extends randomly, reduce the possibility that the diaphragm extends into the connecting position of the end cover and the shell, and thus improve the connecting strength of the end cover and the shell, and thus improve the structural strength of the battery monomer.

[0009] In some embodiments, the protection member covers part of the end surface and extends to the two first side surfaces.

[0010] Since the protection member covers the end surface and the two first side surfaces, only one complete protection member is needed to extend from one first side surface to the other first side surface across the end surface to complete the sealing of the diaphragm, the operation is simple, and the processing efficiency of the battery monomer can be improved.

[0011] In some embodiments, two protruding portions are arranged on the end cover and spaced apart along the third direction, the battery monomer further comprises a second electrode terminal, the first electrode terminal is arranged on one of the protruding portions and electrically connected with the electrode assembly, the second electrode terminal is arranged on the other protruding portion and electrically connected with the electrode assembly, along the second direction, the projection of the electrically connected part of the first electrode terminal and the electrode assembly on the same projection plane of the protection member does not overlap, and the projection of the electrically connected part of the second electrode terminal and the electrode assembly on the same projection plane of the protection member does not overlap, wherein the first direction, the second direction and the third direction are perpendicular to each other.

[0012] Since the first electrode terminal is arranged on one protruding portion and the second electrode terminal is arranged on the other protruding portion, the two protruding portions are spaced apart, part of the structure of the first electrode terminal and part of the structure of the second electrode terminal can be accommodated in different protruding portions, the risk of conduction of the first electrode terminal and the second electrode terminal can be reduced, and the main body portion can be closer to the electrode assembly relative to the protruding portion, and thus the overall volume of the battery monomer can be reduced. Since along the second direction, the projection of the electrically connected part of the first electrode terminal and the electrode assembly and the projection of the electrically connected part of the second electrode terminal and the electrode assembly on the same projection plane of the protection member do not overlap, the protection member does not hinder the electrical connection between the electrode terminal and the electrode assembly.

[0013] In some embodiments, along the second direction, the projection of the main body portion and the protection member on the same projection plane overlaps, and the projection of the protruding portion and the protection member on the same projection plane does not overlap.

[0014] Therefore, even if the setting position of the protection member has a slight deviation, the electrical connection between the electronic terminal and the electrode assembly is not easily affected, the assembly precision requirement is reduced, and the production efficiency is improved.

[0015] In some embodiments, the battery monomer further comprises a first insulation member, the first insulation member is arranged between the shell and the electrode assembly, and along the second direction, the first insulation member does not exceed the end surface.

[0016] Since the first insulation member is arranged between the shell and the electrode assembly, the electrode assembly can be insulated from the shell, and the probability of accidental conduction is reduced. Since along the second direction, the first insulation member does not exceed the end surface of the electrode assembly, the first insulation member is difficult to extend into the connection position of the main body and the shell, which helps to improve the connection strength of the end cover and the shell, thereby improving the structural strength of the battery monomer.

[0017] In some embodiments, along the second direction, there is a gap between the main body and the first insulation member.

[0018] Since along the second direction, the lowest connection position of the main body and the shell is spaced from the first insulation member, the first insulation member is difficult to extend into the connection position of the main body and the shell, which helps to improve the connection strength of the end cover and the shell, thereby improving the structural strength of the battery monomer.

[0019] In some embodiments, the first insulation member is attached to the protection member by an adhesive sheet, the adhesive sheet is laminated and covers the first insulation member from the side away from the electrode assembly, and the part of the adhesive sheet that does not overlap the covered first insulation member is attached to the protection member.

[0020] Therefore, part of the adhesive sheet sticks to the first insulation member, and the other part of the adhesive sheet sticks to the protection member to relatively fix the first insulation member and the adhesive sheet, which is simple in structure and convenient to operate, and helps to improve the processing efficiency of the battery monomer. The first insulation member and the protection member surround the electrode assembly, which helps to improve the insulation effect of the electrode assembly.

[0021] In some embodiments, the first insulation member comprises a sheet-shaped insulation member, and along the direction perpendicular to the first insulation member, the projection of the first insulation member is located within the projection of the adhesive sheet in the same projection plane.

[0022] Since the first insulating piece comprises a sheet-shaped insulating piece, the sheet-shaped insulating piece can closely fit the electrode assembly and the shell, occupies a smaller space, has a larger coverage area, and can provide a better insulation effect between the electrode assembly and the shell. Since the projection of the first insulating piece in the direction perpendicular to the first insulating piece is located within the projection of the adhesive sheet, the adhesive sheet surrounds all surfaces of the first insulating sheet away from the electrode assembly, and the adhesive sheet outside the first insulating sheet can protect the first insulating sheet inside, thereby helping to reduce the damage of the first insulating sheet. Moreover, the larger area of the adhesive sheet and the first insulating sheet helps to improve the adhesive strength of the first insulating sheet.

[0023] In some embodiments, the surface of the first insulating piece facing the electrode assembly is provided with a first adhesive layer, a portion of the first insulating piece is adhered to the electrode assembly through the first adhesive layer, and another portion of the first insulating piece is adhered to the protective piece through the first adhesive layer.

[0024] Therefore, the first insulating piece can closely fit the surface of the electrode assembly, thereby helping to improve the insulation effect of the electrode assembly relative to the shell. The first insulating piece fixes part of the protective piece between the first insulating piece and the electrode assembly through the first adhesive layer, without the need for additional adhesive layers to fix the protective piece, thereby simplifying the structure, helping to simplify the processing steps, and improving production efficiency.

[0025] In some embodiments, the battery monomer further comprises a second insulating piece, the second insulating piece is arranged between the end cover and the electrode assembly, and the second insulating piece abuts against the protective piece from the side away from the electrode assembly along the second direction.

[0026] Since the second insulating piece is arranged between the end cover and the electrode assembly, the electrode assembly can be insulated from the end cover, thereby reducing the probability of accidental conduction. Since the second insulating piece abuts against the protective piece from the side away from the electrode assembly along the second direction, the second insulating piece can press the protective piece to fix the protective piece, thereby pressing the diaphragm, making it difficult for the diaphragm to extend into the connection position of the end cover and the shell, and helping to improve the connection strength of the end cover and the shell, thereby improving the structural strength of the battery monomer.

[0027] In some embodiments, along the first direction, the second insulating piece does not exceed the protective piece.

[0028] Therefore, the size of the second insulating piece in the first direction is smaller than the size of the opening in the first direction, thereby reducing the probability of the second insulating piece being stuck in the shell, and when the end cover with an uneven bottom extends into the shell from the opening, the second insulating piece is not located on the extension path of the end cover, and does not hinder the extension of the end cover.

[0029] In some embodiments, the end cover is provided with a liquid injection hole, the end cover and the electrode assembly have a flow guide channel in communication with the liquid injection hole, and the protective piece is provided with a first through hole in communication with the flow guide channel.

[0030] Since the end cover is provided with the liquid injection hole, and the end cover and the electrode assembly have the flow guide channel in communication with the liquid injection hole, the electrolyte can enter the flow guide channel from the liquid injection hole, the flow guide channel can guide at least part of the electrolyte to flow to the area in the shell away from the liquid injection hole, reduce the case that the electrolyte accumulates in the area near the liquid injection hole, expand the flow range of the electrolyte in the shell, and help to improve the penetration speed of the electrolyte. Since the part of the protective member provided on the end surface is provided with the first through hole in communication with the flow guide channel, the electrolyte can penetrate the electrode tab and the separator through the first through hole, and help to improve the penetration efficiency.

[0031] In some embodiments, the battery monomer further comprises a second insulating member, the second insulating member is arranged between the end cover and the electrode assembly, along the second direction, the second insulating member abuts the protective member from the side away from the electrode assembly, the side of the second insulating member facing the protective member is provided with a first groove, the side of the first groove facing the protective member is open, and the first groove forms at least part of the flow guide channel.

[0032] Since the second insulating member abuts the protective member from the side away from the electrode assembly along the second direction, the second insulating member can press the protective member to fix the protective member, so that the first through hole can be kept in stable communication with the flow guide channel, and help to keep stable penetration efficiency. Since the side of the second insulating member facing the protective member is provided with the first groove, the electrolyte is guided to the upper side of the protective member by the first groove, and enters the electrode assembly from the first through hole of the protective member, so as to realize the penetration of the electrolyte to the electrode assembly.

[0033] In some embodiments, the battery monomer further comprises a second insulating member, the second insulating member is arranged between the end cover and the electrode assembly, along the second direction, the second insulating member abuts the protective member from the side away from the electrode assembly, the side of the second insulating member facing the end cover is provided with a second groove, the side of the second groove facing the end cover is open, the second groove forms at least part of the flow guide channel, and the second groove is provided with a second through hole, and the flow guide channel is in communication with the first through hole through the second through hole.

[0034] Since the second insulating member abuts the protective member from the side away from the electrode assembly along the second direction, the second insulating member can press the protective member to fix the protective member, so that the first through hole can be kept in stable communication with the flow guide channel, and help to keep stable penetration efficiency. Since the side of the second insulating member facing the end cover is provided with the second groove, and the second through hole is arranged in the second groove, the electrolyte is guided to the upper side of the protective member by the second groove, and flows into the first through hole of the protective member from the second through hole to enter the electrode assembly, so as to realize the penetration of the electrolyte to the electrode assembly.

[0035] In some embodiments, a plurality of first through holes are provided, and the first through holes are arranged along a third direction, wherein the first direction, the second direction and the third direction are perpendicular to each other.

[0036] In this way, the electrolyte can contact more areas of the electrode assembly, which helps to improve the uniformity of electrolyte infiltration on the electrode assembly and improves the efficiency of electrolyte injection.

[0037] In some embodiments, along the second direction, the total area of the projections of all the first through holes in the same projection plane accounts for 10% to 50% of the area of the projection of the electrode assembly.

[0038] In this way, it helps to ensure that the total cross-sectional area of the first through holes meets the flow requirement of electrolyte outflow, and also helps to ensure that the structural strength of the protective member meets the requirement.

[0039] In some embodiments, the equivalent diameter of each first through hole is less than or equal to 15 mm.

[0040] In this way, it not only makes it difficult for the diaphragm to protrude from the first through hole, but also helps to ensure that the structural strength of the protective member meets the requirement.

[0041] In some embodiments, a portion of the end cover is bent in the second direction to form a protruding portion, a portion of the end cover extends into the shell and is connected with the inner circumferential surface of the shell, and the edge of the end cover abuts against and is connected with the end edge of the shell in the second direction.

[0042] Since a portion of the end cover extends into the shell and is connected with the inner circumferential surface of the shell, the inner circumferential surface of the shell can limit the end cover, making it difficult for the end cover to deviate in the first direction and the third direction. Since the edge of the end cover abuts against and is connected with the end edge of the shell in the second direction, the end edge of the shell supports the end cover, limiting the displacement of the end cover relative to the shell in the second direction, which helps to reduce the gap between the end cover and the shell and helps to enhance the connection strength of the end cover and the shell.

[0043] In some embodiments, the side of the protective member facing the electrode assembly has a second adhesive layer.

[0044] In this way, the protective member adheres the diaphragm to the end face, improves the situation that the diaphragm extends into the connection position of the end cover and the shell, and helps to improve the connection strength of the end cover and the shell, thereby improving the structural strength of the battery monomer.

[0045] In some embodiments, the protective member is made of insulating material.

[0046] In this way, when the protective member contacts the pole piece, it does not affect the insulation between the pole pieces, which helps to improve the insulation effect of the electrode assembly relative to the shell.

[0047] In some embodiments, the side of the protrusion part facing the electrode assembly in the second direction has a receiving cavity in communication with the accommodation space, and the tab electrically connected to the first electrode terminal is at least accommodated in the receiving cavity.

[0048] In this way, by accommodating the tab electrically connected to the first electrode terminal in the receiving cavity of the protrusion part, the main body part is closer to the electrode assembly relative to the protrusion part, thereby helping to reduce the overall volume of the battery monomer and improve the volume utilization rate in the battery monomer.

[0049] In some embodiments, the battery monomer includes a first electrode terminal and a second electrode terminal, the end cover has a first protrusion part and a second protrusion part, the first protrusion part has a first receiving cavity, the second protrusion part has a second receiving cavity, part of the first electrode terminal is located in the first receiving cavity, and part of the second electrode terminal is located in the second receiving cavity.

[0050] Since the first electrode terminal is arranged on the first protrusion part and part of the first electrode terminal is located in the first receiving cavity, and the second electrode terminal is arranged on the second protrusion part and part of the second electrode terminal is located in the second receiving cavity, the two electrode terminals are respectively accommodated in relatively independent receiving cavities, which can not only reduce the risk of conduction of the first electrode terminal and the second electrode terminal, but also help to make the main body part closer to the electrode assembly relative to the protrusion part, thereby helping to reduce the overall volume of the battery monomer and improve the volume utilization rate in the battery monomer.

[0051] In a second aspect, the embodiments of the present disclosure also provide a battery including a box body and at least two battery monomers as described above.

[0052] Since the battery includes battery monomers with strong structural strength, the battery has strong use reliability.

[0053] In some embodiments, the battery monomers are arranged in the first direction, and in adjacent battery monomers, the first electrode terminal of one battery monomer is electrically connected to the first electrode terminal of the other battery monomer through a busbar.

[0054] In this way, the electrical connection between adjacent battery monomers is achieved by arranging the busbar.

[0055] In some embodiments, at least one wall of the box body has a boss formed by bulging in a direction away from the battery monomers, the boss forms a receiving part on the side facing the battery monomers, and the projection of the protrusion part does not exceed the projection of the boss in a direction perpendicular to the wall where the boss is formed, and the protrusion part is at least partially accommodated in the receiving part.

[0056] In this way, by accommodating the protrusion part in the receiving part of the boss, the overall volume of the box body is reduced, and the volume utilization rate in the box body is improved.

[0057] In a third aspect, the embodiments of the present disclosure further provide a power consuming device, which comprises the battery cell as described above, or the battery as described above, the battery cell or the battery being used to supply power for the power consuming device.

[0058] Therefore, the use reliability of the power consuming device is improved. In addition, the space reserved for the battery or the battery cell of the power consuming device can be reduced, or the overall energy of the battery can be improved without reducing the space, thereby helping to improve the arrangement freedom of the battery and the surrounding structure of the power consuming device, and helping to improve the endurance / standby capability of the power consuming device.

[0059] In a fourth aspect, the embodiments of the present disclosure further provide an energy storage device, which comprises the battery cell as described above, or the battery as described above, the battery cell or the battery being used to store and provide electric energy.

[0060] Therefore, the use reliability of the energy storage device is improved. In addition, the space reserved for the battery of the energy storage device can be reduced, or the overall energy of the battery can be improved without reducing the space, thereby helping to reduce the space required by the energy storage device or increase the energy storage capability.

[0061] The above description is only a summary of the technical solutions of the present disclosure. In order to enable a clearer understanding of the technical means of the present disclosure, the specific embodiments of the present disclosure are described in detail according to the contents of the description, and in order to make the above and other purposes, characteristics and advantages of the present disclosure more obvious and easy to understand, the following specific embodiments of the present disclosure are described. BRIEF DESCRIPTION OF DRAWINGS

[0062] FIG. 1 is a schematic view of a power consuming device being a vehicle according to an embodiment of the present disclosure;

[0063] FIG. 2 is a schematic view of a battery according to an embodiment of the present disclosure;

[0064] FIG. 3 is a schematic view of a battery cell according to an embodiment of the present disclosure;

[0065] FIG. 4 is a schematic view of an electrode assembly according to an embodiment of the present disclosure;

[0066] FIG. 5 is a schematic view of an electrode assembly according to another embodiment of the present disclosure;

[0067] FIG. 6 is a schematic view of a battery cell according to another embodiment of the present disclosure;

[0068] FIG. 7 is a schematic view of an electrode assembly according to still another embodiment of the present disclosure;

[0069] FIG. 8 is a schematic view of a battery cell according to still another embodiment of the present disclosure;

[0070] FIG. 9 is a schematic view of an electrode assembly with a first through hole in a protective member according to an embodiment of the present disclosure;

[0071] Fig. 10 is a front view of a battery cell according to an embodiment of the present disclosure;

[0072] Fig. 11 is a cross-sectional view of A-A in Fig. 10;

[0073] Fig. 12 is a partial enlarged view of B in Fig. 11;

[0074] Fig. 13 is a top view of a battery cell according to an embodiment of the present disclosure;

[0075] Fig. 14 is a cross-sectional view of C-C in Fig. 13;

[0076] Fig. 15 is a partial enlarged view of D in Fig. 14;

[0077] Fig. 16 is a schematic view of a second insulating member provided with a second groove according to an embodiment of the present disclosure;

[0078] Fig. 17 is a schematic view of a battery provided with a boss according to an embodiment of the present disclosure.

[0079] Legend of reference signs 1000, vehicle; 100, battery; 101, box; 1011, boss; 102, battery cell; 200, controller; 300, motor; 10, housing; 11, end cover; 111, main body portion; 112, protruding portion; 112a, accommodating cavity; 113, liquid injection hole; 12, electrode assembly; 121, end surface; 122, first side surface; 123, second side surface; 124, tab; 13, first electrode terminal; 14, second electrode terminal; 15, protective member; 151, first through hole; 16, first insulating member; 17, adhesive sheet; 18, second insulating member; 19, flow guide passage; 191, first groove; 192, second groove; 193, second through hole; X, first direction; Z, second direction; Y, third direction. DETAILED DESCRIPTION

[0080] The embodiments of the technical solutions of the present disclosure will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present disclosure, and therefore only serve as examples, and cannot limit the protection scope of the present disclosure.

[0081] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this present disclosure belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure; the terms "include" and "have" and any variations thereof in the present disclosure are intended to cover non-exclusive inclusion.

[0082] In the description of the embodiments of the disclosure, the technical terms "first", "second", "third", "fourth" and the like 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 disclosure, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0083] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the disclosure. The occurrence of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0084] In the description of the embodiments of the disclosure, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A existing alone, A and B existing together, and B existing alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.

[0085] In the description of the embodiments of the disclosure, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the disclosure and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed in a particular orientation, be operated or used, and therefore cannot be understood as a limitation on the embodiments of the disclosure.

[0086] In the description of the embodiments of the disclosure, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the disclosure can be understood according to the specific circumstances.

[0087] In the description of the embodiments of the disclosure, unless otherwise explicitly specified and limited, the technical term "contact" should be understood in a broad sense, which can be direct contact or contact through an intermediate medium layer, and can be contact between two objects in contact without interaction force, or contact between two objects in contact with interaction force.

[0088] Hereinafter, the present disclosure will be described in detail.

[0089] New energy batteries are increasingly widely used in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also increasingly used in the field of energy storage and the like.

[0090] A battery includes at least one battery cell, which generally includes a shell having an opening, an electrode assembly accommodated in the shell, and an end cover covering the opening. If there is foreign matter (such as a separator described below) at the connection position of the end cover and the shell, the connection strength, sealing performance, and the like of the end cover and the shell can be adversely affected. The electrode assembly generally includes positive and negative electrode sheets and a separator interposed between the positive and negative electrode sheets. In order to ensure that the electrode sheets can be insulated from each other, the length of the separator is generally longer than that of the electrode sheets.

[0091] However, the part of the separator that is higher than the electrode sheets can extend into the gap between the end cover and the shell, which can affect the sealing performance and the connection strength of the end cover and the shell. In particular, for a battery cell in which the end cover is provided with a protruding portion, since the structures (such as tabs) protruding from the surface of the electrode assembly can be accommodated in the protruding portion, the main body portion of the end cover can be arranged closer to the electrode assembly. This results in the separator being easily extended into the connection position of the main body portion and the shell, which affects the connection of the end cover and the shell, thereby reducing the structural strength of the battery cell. Therefore, how to reduce the risk of the separator entering the connection position of the end cover and the shell, and further reduce the influence of the separator on the strength of the battery cell is one of the problems in the industry.

[0092] The present disclosure provides a battery cell capable of reducing the risk of the separator entering the connection position of the end cover and the shell.

[0093] Based on such design concept, the inventors of the present disclosure designed a battery cell, which includes a shell having an accommodation space and an opening, an electrode assembly accommodated in the accommodation space, the electrode assembly including at least electrode sheets and a separator stacked along a first direction, the electrode assembly having an end face on a side close to the opening along a second direction, the electrode assembly having first side faces opposite to each other along the first direction, an end cover covering the opening, the end cover including a main body portion and a protruding portion connected to the main body portion, the protruding portion protruding away from the electrode assembly along the second direction, a first electrode terminal provided in the protruding portion and electrically connected to the electrode assembly, and a protective member covering part of the end face and extending to at least one of the first side faces, and in the same projection plane perpendicular to the second direction, the protective member at least partially overlaps the orthographic projection of the main body portion, wherein the first direction and the second direction are perpendicular.

[0094] Since the first electrode terminal is arranged on the protruding portion and electrically connected with the electrode assembly, part of the structure of the first electrode terminal can be accommodated in the protruding portion, and the main body portion can be closer to the electrode assembly relative to the protruding portion, thereby helping to reduce the overall volume of the battery monomer. Since the protective member and the orthographic projection of the main body portion at least partially overlap in the same projection plane perpendicular to the second direction, the protective member can bind the diaphragm close to the main body portion, reducing the case of the diaphragm extending at will, reducing the possibility of the diaphragm extending into the connecting position of the end cover and the shell, and helping to improve the connection strength of the end cover and the shell, thereby improving the structural strength of the battery monomer.

[0095] The battery monomer involved in the embodiments of the present disclosure can be a secondary battery, which refers to a battery monomer that can be activated by charging after discharging.

[0096] The battery monomer can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc., and the embodiments of the present disclosure are not limited thereto.

[0097] The battery monomer generally includes an electrode assembly. The electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a separator (e.g., a diaphragm below). During the charging and discharging process of the battery monomer, active ions (e.g., lithium ions) are inserted and extracted between the positive electrode sheet and the negative electrode sheet. The separator is arranged between the positive electrode sheet and the negative electrode sheet, which can prevent the positive and negative electrodes from short-circuiting, and at the same time allow the active ions to pass through. The positive electrode sheet generally includes a positive electrode current collector and a positive electrode active material attached to the positive electrode current collector. Exemplarily, the positive electrode current collector can be an aluminum foil. The negative electrode sheet generally includes a negative electrode current collector and a negative electrode active material attached to the negative electrode current collector. Exemplarily, the negative electrode current collector can be a copper foil.

[0098] In some embodiments, the electrode assembly is provided with tabs, which can guide current out of the electrode assembly. The tabs include positive tabs and negative tabs. The positive tabs can be connected to the positive electrode current collector, and the negative tabs can be connected to the negative electrode current collector.

[0099] In some embodiments, the battery monomer can include a shell. The shell is used to encapsulate components such as the electrode assembly and the electrolyte. The shell can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0100] As an example, the battery monomer can be a cylindrical battery monomer, a prismatic battery monomer, a soft-pack battery monomer, or other shapes of battery monomers, the prismatic battery monomer includes a square shell battery monomer, a blade-shaped battery monomer, a multi-prismatic battery, such as a hexagonal prism battery, etc., and the present disclosure is not particularly limited.

[0101] In some embodiments, at least one electrode terminal is arranged on the shell, and the electrode terminal is electrically connected with the tab. The electrode terminal can be directly connected with the tab, or can be connected with the tab through an adapter or the like.

[0102] The battery mentioned in the embodiments of the present disclosure can include one or more battery cells to provide a single physical module with higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, in parallel, or in a mixed connection through a busbar.

[0103] In some embodiments, the battery can be a battery module, and when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0104] In some embodiments, the battery can be a battery pack, and the battery pack includes a box body and battery cells, and the battery cells or battery modules are accommodated in the box body.

[0105] In some embodiments, the box body can be part of the chassis structure of the vehicle. For example, part of the box body can be at least part of the floor of the vehicle, or part of the box body can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0106] In some embodiments, the battery cell or the battery can be applied to an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, or the like.

[0107] The technical solutions described in the embodiments of the present disclosure are applicable to various electric devices using battery cells or batteries, such as mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships, and spacecraft, such as aircraft, rockets, space shuttles, and spacecraft.

[0108] In the following, the electric device of the embodiments of the present disclosure is taken as the vehicle 1000 for example to be described in conjunction with the drawings.

[0109] FIG. 1 is a structural schematic diagram of the vehicle 1000 provided by an embodiment of the present disclosure. The vehicle 1000 can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric vehicle, a hybrid electric vehicle, or a range extended vehicle, etc. As shown in FIG. 1, the vehicle 1000 is internally provided with a battery 100, and the battery 100 can be arranged at the bottom, the head, or the tail of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000, for example, the battery 100 can be used as the operating power supply of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the power demand of the vehicle 1000 during starting, navigation, and driving.

[0110] In some embodiments of the present disclosure, the battery 100 can not only serve as an operating power source of the vehicle 1000, but also serve as a driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0111] The following will be described in detail with reference to the accompanying drawings.

[0112] FIG. 2 is a schematic diagram of a battery according to an embodiment of the present disclosure; FIG. 3 is a schematic diagram of a battery cell according to an embodiment of the present disclosure; FIG. 4 is a schematic diagram of an electrode assembly according to an embodiment of the present disclosure; FIG. 5 is a schematic diagram of an electrode assembly according to another embodiment of the present disclosure; FIG. 6 is a schematic diagram of a battery cell according to another embodiment of the present disclosure; FIG. 7 is a schematic diagram of an electrode assembly according to yet another embodiment of the present disclosure; FIG. 8 is a schematic diagram of a battery cell according to yet another embodiment of the present disclosure; FIG. 9 is a schematic diagram of an electrode assembly with a first through hole in a protective member according to an embodiment of the present disclosure; FIG. 10 is a front view of a battery cell according to an embodiment of the present disclosure; FIG. 11 is a sectional view of A-A in FIG. 10; FIG. 12 is a partial enlarged view of B in FIG. 11; FIG. 13 is a top view of a battery cell according to an embodiment of the present disclosure; FIG. 14 is a sectional view of C-C in FIG. 13; FIG. 15 is a partial enlarged view of D in FIG. 14; FIG. 16 is a schematic diagram of a second insulating member with a second groove according to an embodiment of the present disclosure; and FIG. 17 is a schematic diagram of a battery with a boss according to an embodiment of the present disclosure.

[0113] In a first aspect, an embodiment of the present disclosure provides a battery cell 102, as shown in FIGS. 3 to 10, comprising: a housing 10, the housing 10 having a containing space and an opening; an electrode assembly 12, accommodated in the containing space, the electrode assembly 12 comprising at least a tab and a separator stacked along a first direction X, the electrode assembly 12 having an end face 121 on a side close to the opening along a second direction Z, the electrode assembly 12 having a first side face 122 opposite to each other along the first direction X; an end cover 11, covering the opening, the end cover 11 comprising a main body portion 111 and a protruding portion 112 connected to the main body portion 111, the protruding portion 112 protruding away from the electrode assembly 12 along the second direction Z; a first electrode terminal 13, provided on the protruding portion 112 and electrically connected to the electrode assembly 12; and a protective member 15, covering part of the end face 121 and extending to at least one first side face 122, and in the same projection plane perpendicular to the second direction Z, the protective member 15 at least partially overlaps with the main body portion 111, wherein the first direction X and the second direction Z are perpendicular.

[0114] The battery cell 102 comprises the housing 10, the electrode assembly 12, the end cover 11, the first electrode terminal 13, and the protective member 15.

[0115] The electrode assembly 12 includes an electrode tab and a separator. The separator closely adheres to and covers the surface of the electrode tab, and the separator is slightly larger in size than the electrode tab. The electrode assembly 12 can be manufactured using a stacking process or a winding process, and the present disclosure does not make any special limitation on the manufacturing process of the electrode assembly 12.

[0116] The electrode tab can include a positive electrode tab and a negative electrode tab. The positive electrode tab can include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector. The negative electrode tab can include a negative electrode current collector.

[0117] As an example, the positive electrode current collector has two surfaces opposite in the thickness direction thereof, and the positive electrode active material is disposed on either one or both of the two opposite surfaces of the positive electrode current collector.

[0118] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as the metal foil, silver surface-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, or the like can be used. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, or the like) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, or the like).

[0119] As an example, the positive electrode active material can include at least one of lithium-containing phosphates, lithium transition metal oxides, and modified compounds thereof. However, the present disclosure is not limited to these materials, and other conventional materials that can be used as a battery positive electrode active material can also be used. These positive electrode active materials can be used alone or in combination with two or more. Among them, examples of the lithium-containing phosphates can include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (which can also be referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite material of lithium manganese iron phosphate and carbon.

[0120] As an example, the negative current collector can employ a metal foil, a foam metal, or a composite current collector. For example, as a metal foil, silver surface-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, a carbon electrode, or the like can be employed. The composite current collector can include a polymer material base layer and a metal layer. The foam metal can be a foam nickel, a foam copper, a foam aluminum, a foam alloy, or a foam carbon, or the like. The composite current collector can be formed by forming a metal material (copper, a copper alloy, nickel, a nickel alloy, titanium, a titanium alloy, silver, and a silver alloy, or the like) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, or the like). In some embodiments, the material of the positive current collector can be aluminum, and the material of the negative current collector can be copper.

[0121] In some embodiments, the separator can be selected from any known porous structure separator having good chemical stability and mechanical stability. As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride, ceramic.

[0122] Optionally, the electrode assembly 12 is manufactured by a stacking process. In some embodiments, the positive electrode sheet and the negative electrode sheet are subjected to multiple reverse bending, so that the positive electrode sheet and the negative electrode sheet are alternately stacked at least along a first direction X, and the separator is arranged at least between the positive electrode sheet and the negative electrode sheet. The separator and the electrode sheet extend in a second direction Z. The first direction X is a direction perpendicular to the plane in which the separator is located, and the second direction Z is a direction parallel to the plane in which the separator is located, and the second direction Z is perpendicular to the first direction X.

[0123] Also optionally, the electrode assembly 12 is manufactured by a winding process. At least one positive electrode sheet, one negative electrode sheet, and one separator are arranged, and the positive electrode sheet, the separator, and the negative electrode sheet are sequentially attached along a first direction X, and are wound by a winding machine, so that the positive electrode sheet, the separator, and the negative electrode sheet are alternately stacked at least along the first direction X. If the electrode assembly 12 after winding is approximately a cylinder, the first direction X is any radial direction of the electrode assembly 12 after winding, and the second direction Z is an axial direction of the electrode assembly 12 after winding, and the second direction Z is perpendicular to the first direction X. If the electrode assembly 12 after winding is approximately a cube, the first direction X is a direction perpendicular to the plane in which the separator is located, and the second direction Z is a direction parallel to the plane in which the separator is located, and the second direction Z is perpendicular to the first direction X.

[0124] The second direction Z of the electrode assembly 12 is on both sides of the protrusion of the separator with respect to the tab, and the separator and the tab are concave-convexly distributed. The face on which the end of the separator on either side of the second direction Z of the electrode assembly 12 is located can be regarded as an end face 121. The surfaces on both sides of the first direction X of the electrode assembly 12 are complete surfaces of the tab or complete surfaces of the separator, and the surfaces on both sides of the first direction X of the electrode assembly 12 opposite to each other can be regarded as a first side face 122. The surfaces on both sides of the third direction Y of the electrode assembly 12 are complete faces. The surfaces on both sides of the third direction Y of the electrode assembly 12 opposite to each other can be regarded as a second side face 123. The first direction X, the second direction Z and the third direction Y are perpendicular to each other.

[0125] The housing 10 surrounds an accommodation space, and the housing 10 is configured with an opening towards one side, and the electrode assembly 12 can enter the accommodation space of the housing 10 from the opening. After the electrode assembly 12 is placed in the accommodation space, one side end face 121 of the second direction Z of the electrode assembly 12 faces the opening, and the end face 121 is protruded with the separator with respect to the tab, and the separator and the tab are concave-convexly distributed. The housing 10 can be configured in a cylindrical shape, a rectangular shape, etc. according to the shape of the electrode assembly 12, and the shape of the housing 10 is not limited by any characteristics in the present disclosure.

[0126] The end cover 11 covers the opening of the housing 10 to close the accommodation space. As shown in FIGS. 3, 6 and 8, the end cover 11 includes a main body part 111 and a protruding part 112. A part of the end cover 11 protrudes in a direction away from the accommodation space to form the protruding part 112, and the part of the end cover 11 without the protruding part 112 is the main body part 111. The protruding part 112 has a receiving cavity 112a therein, and the receiving cavity 112a is in communication with the accommodation space and can be used to receive part of the structure of the electrode assembly 12 and part of the structure of the first electrode terminal 13.

[0127] The first electrode terminal 13 is provided on the end cover 11 and penetrates the end cover 11. One end of the first electrode terminal 13 is placed in the accommodation space and electrically connected with the electrode assembly 12, and the other end of the first electrode terminal 13 is exposed from the end cover 11 for electrical connection with the outside. The first electrode terminal 13 can be arranged on the protruding part 112, so that part of the structure of the first electrode terminal 13 is received in the receiving cavity 112a.

[0128] In some embodiments, the end cover 11 includes a covering part, and the projection of the covering part covers the projection of the opening along the second direction Z. The second direction Z of one side surface of the covering part abuts against the second direction Z of one side surface of the housing 10, and the positions where the covering part and the housing 10 abut against each other can be connected by welding. The end cover 11 can also include a limiting part, which is provided on the side of the covering part close to the accommodation space and protrudes from the surface of the covering part. At least the first direction X of the surface of the limiting part abuts against the inner wall surface of the housing 10.

[0129] The protector 15 covers at least the end surface 121 and presses the diaphragm on the end surface 121 near the connection position of the end cap 11 and the housing 10. Specifically, the main body portion 111 is closer to the electrode assembly 12 than the protruding portion 112, and the diaphragm protruding from the end surface 121 easily extends to the connection position of the main body portion 111 of the end cap 11 and the housing 10. The protector 15 is provided at least on the diaphragm near the connection position of the main body portion 111 and the housing 10. The projection of the protector 15 along the second direction Z and the projection of the main body portion 111 along the second direction Z at least partially overlap in the same projection plane perpendicular to the second direction Z.

[0130] Further, the protector 15 also covers at least one of the first side surface 122. The protector 15 covers the edge between the end surface 121 and the first side surface 122, and the diaphragm is completely isolated from the connection position of the main body portion 111 and the housing 10. In some embodiments, the protector 15 can span from one side to the other side of the first direction X of the end surface 121, and cover the portion of the end surface 121 overlapping the projection of the main body portion 111 along the second direction Z and the edge of the first direction X on both sides of the portion. Optionally, the protector 15 also covers at least one of the second side surface 123. The protector 15 can cover the corner between the end surface 121 and the first side surface 122 and / or the edge between the end surface 121 and the second side surface 123.

[0131] In some embodiments, the protector 15 can be configured in a film or sheet shape. As an example, the protector 15 can be a film such as a blue film or the like that can be insulated.

[0132] In the embodiments of the present disclosure, since the first electrode terminal 13 is arranged on the protruding portion 112 and electrically connected with the electrode assembly 12, part of the structure of the first electrode terminal 13 can be accommodated in the protruding portion 112, and the main body portion 111 can be closer to the electrode assembly 12 relative to the protruding portion 112, thereby helping to reduce the overall volume of the battery monomer 102. Since the normal projection of the protection member 15 and the main body portion 111 at least partially overlaps in the same projection plane perpendicular to the second direction Z, the protection member 15 can bind the diaphragm close to the main body portion 111, reduce the case that the diaphragm extends randomly, reduce the possibility that the diaphragm extends into the connecting position of the end cover 11 and the shell 10, and help to improve the connecting strength of the end cover 11 and the shell 10, thereby improving the structural strength of the battery monomer 102. Since the first electrode terminal 13 is arranged on the protruding portion 112 and electrically connected with the electrode assembly 12, the terminal disc and the adapter plate of the first electrode terminal 13 and the tab 124 of the electrode assembly 12 can be accommodated in the protruding portion 112, and the main body portion 111 can be closer to the electrode assembly 12 relative to the protruding portion 112, thereby helping to reduce the overall volume of the battery monomer 102. Since the electrode assembly 12 is arranged in the accommodation space, and the end cover 11 closes the opening of the shell 10, the shell 10 and the end cover 11 can close and protect the electrode assembly 12.

[0133] In some embodiments, as shown in FIG. 4, two protection members 15 are arranged apart from each other along the first direction X, one protection member 15 covers part of the end face 121 and extends to one first side face 122, and the other protection member 15 covers part of the end face 121 and extends to the other first side face 122.

[0134] In a specific embodiment, the protruding portion 112 extends from one side of the end cover 11 in the first direction X to the other side, the protruding portion 112 is arranged on both sides of the end cover 11 in the third direction Y, and the main body portion 111 is located between the protruding portions 112. On the end face 121, the part of the projection of the main body portion 111 along the second direction Z coinciding with the end face 121 is provided with the protection member 15, and the protection member 15 is arranged at least at the edge between the end face 121 and the first side face 122.

[0135] Specifically, the part of the end face 121 facing the main body portion 111 is provided with the protection member 15 arranged apart from each other along the first direction X, the protection member 15 located on one side of the end face 121 in the first direction X extends to the close first side face 122, and the protection member 15 located on the other side of the end face 121 in the first direction X extends to the close first side face 122.

[0136] Optionally, the protection member 15 is a blue film, one side surface of which is adhesive. A part of the blue film is attached to the part of the end face 121 facing the main body part 111, the blue film is configured in a strip shape and extends along the third direction Y, and the length of the third direction Y of the blue film is not less than the length of the third direction Y of the main body part 111; another part of the blue film is attached to the first side face 122, and the blue film isolates the diaphragm from the connection position of the main body part 111 and the shell 10.

[0137] The protrusion part 112 can be located at any position of the end cover 11. If one side of the protrusion part 112 relative to the third direction Y of the end cover 11 has a space, the main body part 111 is located at the side of the end cover 11 relative to the third direction Y. Along the second direction Z, the part of the end face 121 facing the main body part 111 has three edges, and the diaphragm located near the three edges is easy to extend into the connection position of the main body part 111 and the shell 10, and the three edges can be respectively covered by the protection member 15.

[0138] Specifically, at least three protection members 15 are provided. Two of the three protection members 15 extend along the third direction Y, and the remaining one protection member 15 extends along the first direction X. The two protection members 15 extending along the third direction Y are arranged on both sides of the first direction X of the end face 121, and the two protection members 15 extend from the end face 121 to the first side face 122 in directions away from each other. The protection member 15 extending along the first direction X is arranged on one side of the third direction Y of the end face 121 and corresponds to the position of the main body part 111.

[0139] Optionally, one protection member 15 extends along the edge of the end face 121 from one side of the first direction X of the end face 121 and is bent until it extends to the other side of the first direction X of the end face 121, thereby covering the edge of the end face 121 facing the main body part 111.

[0140] Since the protection member 15 covers the two side edges of the electrode assembly 12 respectively, each protection member 15 extends from the end face 121 to one first side face 122, so that the diaphragm is isolated from the connection position of the end cover 11 and the shell 10, thereby improving the condition that the diaphragm extends into the connection position of the end cover 11 and the shell 10, and saving the amount of the protection member 15.

[0141] In some embodiments, continuing to refer to FIG. 4, the two protection members 15 are arranged away from each other along the third direction Y.

[0142] Specifically, as shown in FIG. 7, the protection member 15 is arranged on the part of the end face 121 facing the main body part 111 and away from each other along the third direction Y, the protection member 15 located on one side of the third direction Y of the end face 121 extends to the second side face 123 close to it, and the protection member 15 located on the other side of the third direction Y of the end face 121 extends to the second side face 123 close to it.

[0143] Optionally, the protection member 15 is a blue film, one side surface of the blue film is adhesive. A part of the blue film is attached to the part of the end surface 121 facing the main body 111, the blue film is configured in a strip shape and extends along the first direction X, the length of the first direction X of the blue film is not less than the length of the first direction X of the main body 111; another part of the blue film is attached to the second side surface 123, the blue film isolates the diaphragm from the connection position of the main body 111 and the shell 10.

[0144] In an optional embodiment, the protruding part 112 is configured to have a space with the first direction X and the third direction Y of the end cover 11 respectively. For example, the protruding part 112 is formed on the end cover 11 by a stamping process. Two protection members 15 are respectively arranged on the two sides of the first direction X of the end surface 121, and a part of each protection member 15 is arranged on the end surface 121, and another part of the protection member 15 is arranged close to the first side surface 122.

[0145] In some embodiments, as shown in FIGS. 5, 7 and 9, the protection member 15 covers part of the end surface 121 and extends to the two first side surfaces 122.

[0146] The projection of the main body 111 along the second direction Z on the end surface 121 has an overlapping area, and the protection member 15 can be arranged to cover the entire overlapping area. The end cover 11 extends along the first direction X, and the position of the end cover 11 without the protruding part 112 is the main body 111. The protection member 15 extends from the first side surface 122 of one side of the first direction X to the end surface 121 and covers the entire overlapping area, and then extends to the first side surface 122 of the other side of the first direction X. The protection member 15 extending to the first side surface 122 can cover part or all of the first side surface 122.

[0147] Since the protection member 15 covers the end surface 121 and the two first side surfaces 122, only one complete protection member 15 is needed to extend from one first side surface 122 to the other first side surface 122 across the end surface 121 to complete the sealing of the diaphragm, which is simple to operate and helps to improve the processing efficiency of the battery monomer 102.

[0148] In some embodiments, the end cover 11 is provided with one protruding part 112. The battery monomer 102 further comprises a second electrode terminal 14, which is arranged on the protruding part 112 and separated from the first electrode terminal 13, the second electrode terminal 14 is electrically connected with the electrode assembly 12, and the protruding part 112 can accommodate part of the second electrode terminal 14 and part of the first electrode terminal 13.

[0149] In some embodiments, as shown in FIGS. 8-10 and 13, the end cover 11 is provided with two protrusions 112, which are spaced apart along the third direction Y. The battery cell 102 further comprises a second electrode terminal 14. The first electrode terminal 13 is arranged on one of the protrusions 112 and electrically connected to the electrode assembly 12. The second electrode terminal 14 is arranged on the other protrusion 112 and electrically connected to the electrode assembly 12. Along the second direction Z, the projection of the position where the first electrode terminal 13 is electrically connected to the electrode assembly 12 on the same projection plane as the protective member 15 does not overlap with the projection of the protective member 15 on the same projection plane. The projection of the position where the second electrode terminal 14 is electrically connected to the electrode assembly 12 on the same projection plane as the protective member 15 does not overlap with the projection of the protective member 15 on the same projection plane. Here, the first direction X, the second direction Z and the third direction Y are perpendicular to each other.

[0150] The end cover 11 is provided with two protrusions 112, each of which can extend along the first direction X. The two protrusions 112 are spaced apart along the third direction Y. The two protrusions 112 can be arranged at any position of the end cover 11. For example, the two protrusions 112 can be arranged on the two sides of the end cover 11 along the third direction Y.

[0151] The battery cell 102 further comprises a second electrode terminal 14, which is spaced apart from the first electrode terminal 13. The first electrode terminal 13 can be arranged on one of the protrusions 112, and the second electrode terminal 14 can be arranged on the other protrusion 112. The first electrode terminal 13 and the second electrode terminal 14 are respectively electrically connected to the electrode assembly 12. The protective member 15 can extend from the area of the end surface 121 facing the main body portion 111 to the area of the end surface 121 facing the protrusions 112, and avoid the positions where the first electrode terminal 13 and the electrode assembly 12 are electrically connected and the positions where the second electrode terminal 14 and the electrode assembly 12 are electrically connected.

[0152] In a specific embodiment, the electrode assembly 12 comprises a positive electrode tab, a negative electrode tab and a separator. The positive electrode tab has a positive electrode lug protruding from the end surface 121, and the positive electrode lug is electrically connected to the first electrode terminal 13. The negative electrode tab has a negative electrode lug protruding from the end surface 121, and the negative electrode lug is electrically connected to the second electrode terminal 14. Along the second direction Z, the projection of one of the protrusions 112 on the same projection plane as the positive electrode lug at least partially overlaps with the positive electrode lug, so that the positive electrode lug is at least partially accommodated in the protrusion 112. Along the second direction Z, the projection of the other protrusion 112 on the same projection plane as the negative electrode lug at least partially overlaps with the negative electrode lug, so that the negative electrode lug is at least partially accommodated in the protrusion 112.

[0153] The first electrode terminal 13 penetrates the protruding portion 112, and a portion of the first electrode terminal 13 is accommodated in the protruding portion 112. One end of the first electrode terminal 13 is electrically connected to the positive tab, and the other end of the first electrode terminal 13 is arranged on the surface of the protruding portion 112 away from the accommodation space. The second electrode terminal 14 penetrates the protruding portion 112, and a portion of the second electrode terminal 14 is accommodated in the protruding portion 112. One end of the second electrode terminal 14 is electrically connected to the negative tab, and the other end of the second electrode terminal 14 is arranged on the surface of the protruding portion 112 away from the accommodation space. The protective member 15 covers the end face 121 opposite to the main body portion 111, and can extend to the edge of the closest positive tab and / or negative tab.

[0154] Since the first electrode terminal 13 is arranged in one protruding portion 112, the second electrode terminal 14 is arranged in another protruding portion 112, and the two protruding portions 112 are arranged in a spaced manner, the terminal disc and adapter plate structures of the first electrode terminal 13 and the terminal disc and adapter plate structures of the second electrode terminal 14 can be accommodated in different protruding portions 112, respectively, which can not only reduce the risk of conduction of the first electrode terminal 13 and the second electrode terminal 14, but also make the main body portion 111 closer to the electrode assembly 12 relative to the protruding portion 112, thereby helping to reduce the overall volume of the battery monomer 102. Since along the second direction Z, the electrical connection positions of the first electrode terminal 13 and the electrode assembly 12 and the electrical connection positions of the second electrode terminal 14 and the electrode assembly 12 do not overlap with the projection of the protective member 15 on the same projection plane, the protective member 15 does not hinder the electrical connection between the electrode terminals and the electrode assembly 12.

[0155] In some embodiments, along the second direction Z, the projection of the main body portion 111 and the protective member 15 on the same projection plane overlaps, and the projection of the protruding portion 112 and the protective member 15 on the same projection plane does not overlap.

[0156] As shown in FIG. 15, the end of the protective member 15 extending along the third direction Y is slightly spaced from the protruding portion 112. Along the third direction Y, the entire protective member 15 is located within the range of the main body portion 111.

[0157] Therefore, even if there is a slight deviation in the arrangement position of the protective member 15, it is not easy to hinder the electrical connection between the electrode terminals and the electrode assembly, which reduces the requirement for assembly precision and is beneficial to improve the production efficiency.

[0158] In some embodiments, as shown in FIGS. 11 and 12, the battery monomer 102 further comprises a first insulating member 16 arranged between the shell 10 and the electrode assembly 12, and along the second direction Z, the first insulating member 16 does not exceed the end face 121.

[0159] In some embodiments, there is a gap between the main body portion 111 (the lowest connection position of the main body portion 111 and the housing 10) and the first insulating member 16 along the second direction Z.

[0160] The battery cell 102 further comprises a first insulating member 16. The first insulating member 16 itself has insulating properties, and is exemplarily a mylar. The first insulating member 16 is disposed between the housing 10 and the electrode assembly 12.

[0161] In an alternative embodiment, the first insulating member 16 is disposed on the first side surface 122, the second side surface 123 and the surface opposite to the end surface 121 of the electrode assembly 12, and has a thickness such that the regions of the electrode assembly 12 not covered by the first insulating member 16 have gaps with respect to the housing 10, thereby insulating the electrode assembly 12 from the housing 10.

[0162] In another alternative embodiment, the first insulating member 16 is configured as an open-sided box, and the electrode assembly 12 is disposed in the first insulating member 16 such that the first insulating member 16 covers the first side surface 122, the second side surface 123 and the surface opposite to the end surface 121 of the electrode assembly 12, thereby insulating the electrode assembly 12 from the housing 10.

[0163] In order to avoid the first insulating member 16 extending into the connection position of the housing 10 and the end cap 11, there can be a gap between the first insulating member 16 and the connection position of the main body portion 111 and the housing 10 along the second direction Z. The first insulating member 16 can also extend into the space between the protective member 15 and the electrode assembly 12.

[0164] In a specific embodiment, the first insulating member 16 is configured as an open-sided box around the first side surface 122, the second side surface 123 and the surface opposite to the end surface 121 of the electrode assembly 12, and has a notch on the side facing the end cap 11. Along the second direction Z, the region of the first insulating member 16 opposite to the protrusion portion 112 has a gap with the connection position of the protrusion portion 112 and the housing 10, the region of the first insulating member 16 opposite to the main body portion 111 has a gap with the connection position of the main body portion 111 and the housing 10, and the length of the region of the first insulating member 16 opposite to the main body portion 111 is less than the length of the region of the first insulating member 16 opposite to the protrusion portion 112 to form the notch.

[0165] Exemplarily, the distance between the first insulating member 16 and the lowest connection position of the end cap 11 and the housing 10 is not less than 3 mm, such as 3 mm, 3.6 mm, 4.1 mm, 4.5 mm, etc.

[0166] Since the first insulating member 16 is arranged between the housing 10 and the electrode assembly 12, the electrode assembly 12 can be insulated from the housing 10, and the probability of accidental conduction can be reduced. Since the lowest connecting position of the body portion 111 and the housing 10 is spaced apart from the first insulating member 16 along the second direction Z, the first insulating member 16 is difficult to extend to the connecting position of the body portion 111 and the housing 10, and the connecting strength of the end cover 11 and the housing 10 can be improved, thereby improving the structural strength of the battery cell 102.

[0167] In some embodiments, referring to FIG. 12, the first insulating member 16 is adhered to the protective member 15 by the adhesive sheet 17, the adhesive sheet 17 is laminated and covers the first insulating member 16 from the side away from the electrode assembly 12, and the portion of the adhesive sheet 17 that does not overlap the covered first insulating member 16 is adhered to the protective member 15.

[0168] One side of the adhesive sheet 17 has adhesion. Along the second direction Z, the adhesive sheet 17 at least partially overlaps the projection of the body portion 111 on the same projection plane. A portion of the adhesive sheet 17 adheres to the surface of the first insulating member 16 away from the electrode assembly 12, and another portion of the adhesive sheet 17 adheres to the surface of the protective member 15 away from the electrode assembly 12. The protective member 15 can be located between the first insulating member 16 and the electrode assembly 12, and the protective member 15 can also be located between the first insulating member 16 and the adhesive sheet 17.

[0169] If there is a gap between the first insulating member 16 and the protective member 15, a portion of the adhesive sheet 17 can be adhered to the protective member 15, a portion of the adhesive sheet 17 can be adhered to the electrode assembly 12, and the remaining portion of the adhesive sheet 17 can be adhered to the first insulating member 16. If the length of the first insulating member 16 in the second direction Z opposite the protruding portion 112 exceeds the length of the electrode assembly 12 in the second direction Z, the adhesive sheet 17 can be arranged on the first insulating member 16 opposite the body portion 111.

[0170] Thus, a portion of the adhesive sheet 17 adheres to the first insulating member 16, and another portion of the adhesive sheet 17 adheres to the protective member 15 to relatively fix the first insulating member 16 and the adhesive sheet 17, the structure is simple, the operation is convenient, and the processing efficiency of the battery cell 102 can be improved. The first insulating member 16 and the protective member 15 surround the electrode assembly 12, and the insulation effect of the electrode assembly 12 can be improved.

[0171] In some embodiments, the first insulating member 16 includes a sheet-shaped insulating member, and along a direction perpendicular to the first insulating member 16, the projection of the first insulating member 16 is located within the projection of the adhesive sheet 17 in the same projection plane.

[0172] The first insulating member 16 can include a sheet-shaped insulating member and a block-shaped insulating member. The first insulating member 16 is provided with the sheet-shaped insulating member close to the surface of the housing 10, and in the same projection plane, the projection of the first insulating member 16 is located within the projection of the adhesive sheet 17 in the direction perpendicular to the first insulating member 16, that is, the sheet-shaped insulating member covers the entire first insulating member 16. Optionally, the sheet-shaped insulating member has adhesion on both sides.

[0173] Since the first insulating member 16 includes a sheet-shaped insulating member, the sheet-shaped insulating member can closely fit the electrode assembly 12 and the housing 10, occupy less space, cover a larger area, and provide better insulation between the electrode assembly 12 and the housing 10. Since in the direction perpendicular to the first insulating member 16, the projection of the first insulating member 16 is located within the projection of the adhesive sheet 17, the adhesive sheet 17 surrounds the entire surface of the first insulating sheet away from the electrode assembly 12, and the adhesive sheet 17 outside the first insulating sheet can protect the first insulating sheet inside, which helps to reduce the damage of the first insulating sheet. And the large area adhesion between the adhesive sheet 17 and the first insulating sheet helps to improve the adhesion strength of the first insulating sheet.

[0174] In some embodiments, the surface of the first insulating member 16 facing the electrode assembly 12 is provided with a first adhesive layer, and a part of the first insulating member 16 is adhered to the electrode assembly 12 through the first adhesive layer, and another part of the first insulating member 16 is adhered to the protective member 15 through the first adhesive layer.

[0175] The surface of the first insulating member 16 facing the electrode assembly 12 is provided with a first adhesive layer. The first insulating member 16 is adhered to the electrode assembly 12 through the first adhesive layer. In the same projection plane, the projection of the first insulating member 16 and the projection of the protective member 15 have an overlap in the direction perpendicular to the first insulating member 16, and the first insulating member 16 is adhered to the protective member 15 through the first adhesive layer. Further, the surface of the first insulating member 16 facing the housing 10 is also provided with a first adhesive layer.

[0176] In an optional embodiment, the first insulating member 16 is bent and extended towards the end surface 121, and in the same projection plane, the projection of the first insulating member 16 is located within the projection of the protective member 15 in the second direction Z.

[0177] In this way, the first insulating member 16 can closely fit on the surface of the electrode assembly 12, which helps to improve the insulation effect of the electrode assembly 12 relative to the housing 10. The first insulating member 16 fixes part of the protective member 15 between the first insulating member 16 and the electrode assembly 12 through the first adhesive layer, without the need for additional adhesive layer to fix the protective member 15, which is simple in structure, helps to simplify the processing steps and improve production efficiency.

[0178] In some embodiments, as shown in FIGS. 11-16, the battery cell 102 further comprises a second insulating member 18 disposed between the end cover 11 and the electrode assembly 12, and abutting against the protective member 15 from the side away from the electrode assembly 12 along the second direction Z.

[0179] The battery cell 102 further comprises a second insulating member 18 disposed between the end cover 11 and the electrode assembly 12, and capable of pressing the protective member 15 against the end face 121.

[0180] The second insulating member 18 has insulating property, and is exemplarily a plastic.

[0181] Since the second insulating member 18 is disposed between the end cover 11 and the electrode assembly 12, the electrode assembly 12 can be insulated from the end cover 11, reducing the probability of accidental conduction. Since the second insulating member 18 abuts against the protective member 15 from the side away from the electrode assembly 12 along the second direction Z, the second insulating member 18 can press the protective member 15 to fix the protective member 15, so that the protective member 15 presses the diaphragm, making it difficult for the diaphragm to extend to the connection position of the end cover 11 and the shell 10, which helps to improve the connection strength of the end cover 11 and the shell 10, thereby improving the structural strength of the battery cell 102.

[0182] In some embodiments, along the first direction X, the second insulating member 18 does not exceed the protective member 15.

[0183] In this way, the size of the second insulating member 18 along the first direction X is smaller than the size of the opening along the first direction X, reducing the probability of the second insulating member 18 being stuck in the shell 10, and when the end cover 11 with uneven bottom is extended into the shell 10 from the opening, the second insulating member 18 is not located on the extension path of the end cover 11, and does not hinder the extension of the end cover 11.

[0184] In some embodiments, as shown in FIGS. 8 and 15, the end cover 11 is provided with a liquid injection hole 113, and the end cover 11 and the electrode assembly 12 have a flow guide channel 19 communicating with the liquid injection hole 113, and the protective member 15 is provided with a first through hole 151 communicating with the flow guide channel 19.

[0185] The number of liquid injection holes 113 can be one or multiple. The liquid injection hole 113 penetrates the end cover 11 to communicate the accommodation space with the outside, so that the electrolyte can enter the accommodation space through the liquid injection hole 113. In the embodiment shown in FIG. 15, a plugging member, such as a sealing pin, is inserted into the liquid injection hole 113 to plug the liquid injection hole 113.

[0186] The end cover 11 and the electrode assembly 12 have a gap therebetween, and a flow guide channel 19 is formed in the gap. The flow guide channel 19 can be a part of the gap or can be formed by a structure inside the battery cell 102. The flow guide channel 19 is open toward the electrode assembly 12.

[0187] In an alternative embodiment, the protector 15 extends from a first side 122 to the end face 121, and then extends from the part of the end face 121 covered by the protector 15 to another first side 122. Electrolyte flows from the open position of the flow guide channel 19 to the protector 15. A first through hole 151 is formed in the part of the protector 15 on the end face 121, and electrolyte flows through the first through hole 151 to soak the electrode assembly 12.

[0188] In another alternative embodiment, the protectors 15 are arranged apart from each other along the first direction X. If the protectors 15 and the open region of the flow guide channel 19 coincide in the same projection plane along the second direction Z, a first through hole 151 is formed in the position of the protector 15 directly opposite the open region of the flow guide channel 19. If the protectors 15 and the open region of the flow guide channel 19 do not coincide in the same projection plane along the second direction Z, electrolyte flows directly from the open position of the flow guide channel 19 to the electrode assembly 12, and the first through hole 151 can not be formed in the protector 15.

[0189] In some embodiments, the injection hole 113 is arranged on the protrusion 112, and the protrusion 112 has a receiving cavity 112a on the side facing the electrode assembly 12. The receiving cavity 112a is in communication with the accommodation space. The injection hole 113 is in communication with the flow guide channel 19 through the receiving cavity 112a. The receiving cavity 112a can temporarily store electrolyte, reducing the probability of excessive electrolyte injection.

[0190] In some embodiments, protrusions 112 are arranged on both sides of the end cover 11 along the third direction Y, and injection holes 113 are formed in each protrusion 112. The flow guide channel 19 communicates the receiving cavities 112a on both sides. Electrolyte has a larger flow range, which can meet the injection requirements of multiple positions on the electrode assembly 12.

[0191] Since the end cover 11 is provided with the liquid injection hole 113, and the end cover 11 and the electrode assembly 12 have the flow guide channel 19 in communication with the liquid injection hole 113, the electrolyte can flow into the flow guide channel 19 from the liquid injection hole 113, and the flow guide channel 19 can guide at least part of the electrolyte to flow to an area in the casing 10 away from the liquid injection hole 113, reduce the case that the electrolyte accumulates in the area near the liquid injection hole 113, expand the flow range of the electrolyte in the casing 10, and help to improve the penetration speed of the electrolyte. Since the protective piece 15 is provided with the first through hole 151 in communication with the flow guide channel 19 on the part of the end face 121, the electrolyte can penetrate the electrode plate and the separator through the first through hole 151, and the penetration efficiency can be improved.

[0192] In some embodiments, as shown in FIGS. 11 and 12, the battery cell 102 further includes a second insulating piece 18, which is arranged between the end cover 11 and the electrode assembly 12, and abuts against the protective piece 15 from one side away from the electrode assembly 12 along the second direction Z. The side of the second insulating piece 18 facing the protective piece 15 is provided with a first groove 191, and the side of the first groove 191 facing the protective piece 15 is open. The first groove 191 forms at least part of the flow guide channel 19.

[0193] The flow guide channel 19 can be formed by the second insulating piece 18 and the end face 121. The second insulating piece 18 is located between the end cover 11 and the protective piece 15, and the side of the second insulating piece 18 facing the protective piece 15 is provided with the first groove 191 extending along the third direction Y. The first groove 191 is in communication with the liquid injection hole 113, and the side of the first groove 191 facing the protective piece 15 is open and forms the flow guide channel 19 together with the protective piece 15. The electrolyte in the first groove 191 can flow out through the open position of the first groove 191 facing the electrode assembly 12 and directly contact the electrode assembly 12.

[0194] For example, the second insulating piece 18 can be made of plastic material by injection molding process to form the second insulating piece 18 with the first groove 191.

[0195] Since the second insulating piece 18 abuts against the protective piece 15 from one side away from the electrode assembly 12 along the second direction Z, the second insulating piece 18 can press the protective piece 15 to fix the protective piece 15, so that the first through hole 151 can maintain a stable communication state with the flow guide channel 19, and help to maintain a stable penetration efficiency. Since the side of the second insulating piece 18 facing the protective piece 15 is provided with the first groove 191, the electrolyte is guided to the upper side of the protective piece 15, and enters the electrode assembly 12 through the first through hole 151 of the protective piece 15 to realize the penetration of the electrolyte to the electrode assembly 12.

[0196] In some embodiments, as shown in FIG. 16, the battery cell 102 further comprises a second insulating piece 18, which is arranged between the end cover 11 and the electrode assembly 12 along the second direction Z, and abuts against the protective piece 15 from the side away from the electrode assembly 12. The side of the second insulating piece 18 facing the end cover 11 is provided with a second groove 192, which is open to the side of the end cover 11 and forms at least part of the flow guide channel 19. The second groove 192 is provided with a second through hole 193, and the flow guide channel 19 communicates with the first through hole 151 through the second through hole 193.

[0197] The flow guide channel 19 can be formed by the second insulating piece 18 alone. The second insulating piece 18 is located between the end cover 11 and the protective piece 15, and the side of the second insulating piece 18 facing the end cover 11 is provided with a second groove 192 extending along the third direction Y, which communicates with the liquid injection hole 113. The second groove 192 is provided with a second through hole 193, which coincides with the projection of the first through hole 151 in the same projection plane along the second direction Z, so as to communicate the second through hole 193 with the first through hole 151. The electrolyte flows along the second groove 192 and flows into the first through hole 151 from the second through hole 193, and then enters the electrode assembly 12 through the first through hole 151.

[0198] Since the second insulating piece 18 abuts against the protective piece 15 from the side away from the electrode assembly 12 along the second direction Z, the second insulating piece 18 can press the protective piece 15 to fix the protective piece 15, so that the first through hole 151 can be kept in a stable communication state with respect to the flow guide channel 19, which helps to maintain a stable wettability efficiency. Since the side of the second insulating piece 18 facing the end cover 11 is provided with the second groove 192, and the second groove 192 is provided with the second through hole 193, the electrolyte is guided by the second groove 192 to the upper side of the protective piece 15, and then flows into the first through hole 151 of the protective piece 15 from the second through hole 193 to enter the electrode assembly 12, so as to realize the wettability of the electrolyte to the electrode assembly 12.

[0199] In some embodiments, as shown in FIG. 9, the first through hole 151 is provided in plurality, and the first through holes 151 are arranged along the third direction Y, wherein the first direction X, the second direction Z and the third direction Y are perpendicular to each other.

[0200] The first through hole 151 is provided in plurality, and the first through holes 151 can be uniformly arranged along the third direction Y. The shape of each first through hole 151 can be configured to be different or the same, and the size of each first through hole 151 can be configured to be different or the same, and the present disclosure does not make any special limitation on the size and shape of the first through hole 151.

[0201] Optionally, the second channels are provided in plurality corresponding to the first channels and arranged along the third direction Y. In this way, the electrolyte can contact more areas of the electrode assembly 12, which helps the electrolyte to uniformly infiltrate on the electrode assembly 12, and improves the efficiency of liquid injection.

[0202] In some embodiments, along the second direction Z, the total area of the projections of all the first through holes 151 in the same projection plane accounts for 10% to 50% of the area of the projection of the electrode assembly 12.

[0203] Along the second direction Z, the total area of the projections of all the first through holes 151 in the same projection plane can account for 10%, 22%, 30%, 45%, 50%, etc. of the area of the projection of the electrode assembly 12.

[0204] Optionally, the total area of the projections of all the second through holes 193 accounts for 10% to 50% of the area of the projection of the electrode assembly 12.

[0205] In this way, it helps to meet the flow requirement of the total cross-sectional area of the first through holes 151 for the electrolyte outflow, and also helps to meet the structural strength requirement of the protective piece 15.

[0206] In some embodiments, the equivalent diameter of each first through hole 151 is less than or equal to 15 mm.

[0207] The equivalent diameter of each first through hole 151 can be 2 mm, 4 mm, 6.2 mm, 7 mm, 8.5 mm, 10 mm, 12.5 mm, 15 mm, etc.

[0208] Optionally, the equivalent diameter of the second through hole 193 is less than or equal to 15 mm.

[0209] In this way, it not only makes the diaphragm not easy to protrude from the first through hole 151, but also helps to meet the structural strength requirement of the protective piece 15.

[0210] In some embodiments, the end cover 11 is partially bent along the second direction Z to form a protruding portion 112, a part of the end cover 11 extends into the shell 10 and is connected with the inner circumferential surface of the shell 10, and the edge of the end cover 11 abuts against and is connected with the end edge of the shell 10 in the second direction Z.

[0211] The end cover 11 is partially bent along the second direction Z to form a protruding portion 112, and the edge of the shell 10 in the second direction Z is provided with a raised portion corresponding to the position of the protruding portion 112, the raised portions are spaced apart from each other along the first direction X and jointly form a receiving cavity 112a with the protruding portion 112. A part of the end cover 11 extends into the shell 10 and is connected with the inner circumferential surface of the shell 10, and the edge of the end cover 11 abuts against and is connected with the end edge of the shell 10 in the second direction Z.

[0212] In one specific embodiment, the end cover 11 comprises a cover portion and a limiting portion. In the same projection plane, the projection of the opening is located within the projection of the cover portion, and the side surface of the cover portion in the second direction Z abuts against the side surface of the shell 10 in the second direction Z. The cover portion and the shell 10 can be connected to each other by welding at the position where they abut against each other. The limiting portion is arranged on the side of the cover portion close to the accommodation space, and the limiting portion protrudes from the surface of the cover portion. At least the surface of the limiting portion in the first direction X abuts against the inner wall surface of the shell 10.

[0213] Since a part of the end cover 11 protrudes into the shell 10 and is connected to the inner circumferential surface of the shell 10, the inner circumferential surface of the shell 10 can limit the end cover 11, so that the end cover 11 is difficult to deviate in the first direction X and the third direction Y. Since the edge of the end cover 11 abuts against the end edge of the shell 10 in the second direction Z and is connected to each other, the end edge of the shell 10 in the second direction Z supports the end cover 11, so that the displacement of the end cover 11 relative to the shell 10 in the second direction Z is limited, which helps to reduce the gap between the end cover 11 and the shell 10 and to enhance the connection strength of the end cover 11 and the shell 10.

[0214] In some embodiments, the side of the protective member 15 facing the electrode assembly 12 has a second adhesive layer.

[0215] The protective member 15 is adhered to the electrode assembly 12 by the second adhesive layer. The second adhesive layer can also be provided on the side of the protective member 15 facing the end cover 11, and the second insulating member 18 is adhered to the protective member 15 by the second adhesive layer.

[0216] In this way, the protective member 15 adheres the diaphragm to the end surface 121, improves the situation that the diaphragm protrudes into the connection position of the end cover 11 and the shell 10, and helps to improve the connection strength of the end cover 11 and the shell 10, thereby improving the structural strength of the battery cell 102.

[0217] In some embodiments, the protective member 15 is made of an insulating material.

[0218] For example, the protective member 15 can be made of polypropylene, polyethylene, polybutylene, or the like insulating material.

[0219] In this way, when the protective member 15 contacts the pole piece, it does not affect the insulation between the pole pieces, which helps to improve the insulation effect of the electrode assembly 12 relative to the shell 10.

[0220] In some embodiments, as shown in FIG. 15, the side of the protruding portion 112 facing the electrode assembly 12 in the second direction Z has a receiving cavity 112a communicating with the accommodation space, and the tab 124 electrically connected to the first electrode terminal 13 is at least accommodated in the receiving cavity 112a.

[0221] The protruding portion 112 is formed by protruding toward a side away from the accommodation space, and has a receiving cavity 112a on a side close to the accommodation space, which communicates with the accommodation space. The electrode assembly 12 has a tab 124, and the first electrode terminal 13 is electrically connected to the tab 124. The tab 124 can be entirely received in the receiving cavity 112a, or a part of the tab 124 can be received in the receiving cavity 112a, and the other part of the tab 124 can be received in the accommodation space.

[0222] In this way, by receiving the tab 124 electrically connected to the first electrode terminal 13 in the receiving cavity 112a of the protruding portion 112, the main body portion 111 is closer to the electrode assembly 12 relative to the protruding portion 112, which helps to reduce the overall volume of the battery monomer 102 and improve the volume utilization in the battery monomer 102.

[0223] In some embodiments, the battery monomer 102 includes the first electrode terminal 13 and the second electrode terminal 14, and the end cover 11 has a first protruding portion and a second protruding portion, the first protruding portion has a first receiving cavity, and the second protruding portion has a second receiving cavity, a part of the first electrode terminal 13 is located in the first receiving cavity, and a part of the second electrode terminal 14 is located in the second receiving cavity.

[0224] The first protruding portion and the second protruding portion are arranged separately on the end cover 11, the first electrode terminal 13 is arranged on the first protruding portion, and the second electrode terminal 14 is arranged on the second protruding portion. The electrode assembly 12 has a first tab 124 and a second tab 124. A part of the first electrode terminal 13 passes through the first protruding portion and is electrically connected to the first tab 124, and is received in the first receiving cavity. A part of the second electrode terminal 14 passes through the second protruding portion and is electrically connected to the second tab 124, and is received in the second receiving cavity. For example, as shown in FIG. 15, the second electrode terminal 14 can include a terminal plate located above the second protruding portion and a terminal disc located below the second protruding portion, and the terminal plate and the terminal disc are connected by a connecting column extending in the up-down direction of the drawing. The first electrode terminal 13 can be similarly configured.

[0225] Since the first electrode terminal 13 is arranged on the first protruding portion and a part of the first electrode terminal 13 is located in the first receiving cavity, and the second electrode terminal 14 is arranged on the second protruding portion and a part of the second electrode terminal 14 is located in the second receiving cavity, the two electrode terminals are respectively received in relatively independent receiving cavities 112a, which can not only reduce the risk of conduction of the first electrode terminal 13 and the second electrode terminal 14, but also help the main body portion 111 to be closer to the electrode assembly 12 relative to the protruding portion 112, thereby helping to reduce the overall volume of the battery monomer 102 and improve the volume utilization in the battery monomer 102.

[0226] In a second aspect, the embodiments of the present disclosure further provide a battery 100, comprising a box 101 and at least two battery cells 102 as described above.

[0227] The battery cells 102 are arranged in the box 101 at least along the first direction X and are connected in series or in parallel with each other.

[0228] Since the battery comprises the battery cells 102 with strong structural strength, the battery has strong use reliability.

[0229] In some embodiments, as shown in FIG. 2 and FIG. 17, the battery cells 102 are arranged along the first direction X, and in adjacent battery cells 102, the first electrode terminal 13 of one battery cell 102 is electrically connected to the first electrode terminal 13 of another battery cell 102 through a busbar.

[0230] In this way, the electrical connection between adjacent battery cells 102 is achieved by arranging the busbar.

[0231] In some embodiments, as shown in FIG. 17, at least one wall of the box 101 has a boss 1011 formed by protruding from the wall in a direction away from the battery cells 102, the boss 1011 forms a receiving portion on the side facing the battery cells 102, and the projection of the protruding portion 112 does not exceed the projection of the boss 1011 along the direction perpendicular to the wall where the boss 1011 is formed, and the protruding portion 112 is at least partially received in the receiving portion.

[0232] In this way, by receiving the protruding portion 112 in the receiving portion of the boss 1011, it helps to reduce the overall volume of the box 101 and improve the volume utilization rate in the box 101.

[0233] In a third aspect, the embodiments of the present disclosure further provide a power consumption device, comprising the battery cell 102 as described above, or the battery 100 as described above, the battery cell 102 or the battery supplies power to the power consumption device.

[0234] In this way, the use reliability of the power consumption device is improved. Moreover, the space reserved for the battery or the battery cell 102 in the power consumption device can be reduced, or the overall energy of the battery can be improved while maintaining the space, thereby helping to improve the arrangement freedom of the battery and its surrounding structure of the power consumption device, and helping to improve the endurance / standby capability of the power consumption device.

[0235] In a fourth aspect, the embodiments of the present disclosure further provide an energy storage device, comprising the battery cell 102 as described above, or the battery 100 as described above, the battery cell 102 or the battery is used for storing and providing electrical energy.

[0236] Therefore, the use reliability of the energy storage device is improved. Moreover, the space reserved for the battery can be reduced, or the overall energy of the battery can be improved without reducing the space, thereby helping to reduce the space occupied by the energy storage device or increase the energy storage capacity.

[0237] One specific embodiment of the present disclosure is described below.

[0238] The end cover 11 and the shell 10 are connected by welding. The top (end face 121) of the bare cell (electrode assembly 12) is attached to the blue film (protective member 15), which seals the diaphragm on the surface of the bare cell, so that the diaphragm is isolated from the connection position of the end cover 11 and the shell 10.

[0239] The insulating sheet (first insulating member 16) of the bare cell (electrode assembly 12) is close to the welding area, which will have some adverse effects on welding. A notch is provided at the position where the first insulating member 16 directly faces the main body part 111, so that the first insulating member 16 has a gap from the connection position of the end cover 11 and the shell 10, avoiding the first insulating member 16 extending into the welding area between the end cover 11 and the shell 10, and reducing the influence on welding.

[0240] A lower plastic (second insulating member 18) is provided between the end cover 11 and the electrode assembly 12. Along the third direction Y, the blue film (protective member 15) is longer than the lower plastic (second insulating member 18), but does not exceed the area where the pole (first electrode terminal 13 and second electrode terminal 14) is arranged.

[0241] At least the blue film (protective member 15) is arranged near the edge of the bare cell (electrode assembly 12), and only the lower plastic (second insulating member 18) can be arranged in the middle of the two side edges.

[0242] The main body part 111 and the end face 121 are relatively close, the height of the lower plastic (second insulating member 18) is reduced, and the first insulating member 16 is difficult to fix with the lower plastic (second insulating member 18). The adhesive sheet 17 is arranged to adhere the first insulating member 16 to the electrode assembly 12 or the protective member 15, so that the first insulating member 16 is fixed.

[0243] A plurality of first through holes 151 are provided on the blue film (protective member 15) to increase the infiltration performance. The equivalent diameter of each first through hole 151 is not greater than 15 mm, and the ratio of the total area of all through holes to the total area of the end face 121 is within the range of 10% to 50%.

[0244] The above only describes the preferred embodiments of the present disclosure and is not intended to limit the present disclosure. Those skilled in the art can make various modifications and changes to the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A battery cell comprising: a case having an accommodation space and an opening; an electrode assembly accommodated in the accommodation space, the electrode assembly including a tab and a separator stacked along a first direction, the electrode assembly having an end surface on a side close to the opening along a second direction, the electrode assembly having first side surfaces opposite to each other along the first direction; a terminal cover covering the opening, the terminal cover including a main body portion and a protruding portion connected to the main body portion, the protruding portion protruding away from the electrode assembly along the second direction; a first electrode terminal provided to the protruding portion and electrically connected to the electrode assembly; a protector covering part of the end surface and extending to at least one of the first side surfaces, and, in the same projection plane perpendicular to the second direction, the protector at least partially overlaps a projection of the main body portion, wherein the first direction and the second direction are perpendicular to each other.

2. The battery cell according to claim 1, wherein the protector covers part of the end surface and extends to both of the first side surfaces.

3. The battery cell according to claim 1 or 2, wherein the terminal cover is provided with two protruding portions spaced apart along a third direction, the battery cell further includes a second electrode terminal, the first electrode terminal is provided to one of the protruding portions and electrically connected to the electrode assembly, the second electrode terminal is provided to the other protruding portion and electrically connected to the electrode assembly, in the same projection plane, a projection of the first electrode terminal at a position of electrical connection to the electrode assembly does not overlap a projection of the protector, and a projection of the second electrode terminal at a position of electrical connection to the electrode assembly does not overlap a projection of the protector along the second direction, wherein the first direction, the second direction, and the third direction are perpendicular to each other.

4. The battery cell according to claim 3, wherein in the same projection plane, a projection of the main body portion overlaps a projection of the protector, and a projection of the protruding portion does not overlap a projection of the protector along the second direction.

5. The battery cell according to any one of claims 1 to 4, wherein the battery cell further includes a first insulating member provided between the case and the electrode assembly, in the second direction, the first insulating member does not extend beyond the end surface.

6. The battery cell according to claim 5, wherein in the second direction, there is a gap between the main body portion and the first insulating member.

7. The battery cell according to claim 5 or 6, wherein the first insulating member is adhered to the protector by an adhesive sheet, the adhesive sheet is stacked on the first insulating member from a side away from the electrode assembly, and a portion of the adhesive sheet not overlapping the first insulating member is adhered to the protector.

8. The battery cell according to claim 7, wherein the first insulating member includes a sheet-shaped insulating member, in the same projection plane perpendicular to the first insulating member, a projection of the first insulating member is located within a projection of the adhesive sheet. 9.The battery cell of claim 6, wherein, a surface of the first insulating member facing the electrode assembly is provided with a first adhesive layer, a portion of the first insulating member is adhered to the electrode assembly via the first adhesive layer, and another portion of the first insulating member is adhered to the protective member via the first adhesive layer. 10.The battery cell of any one of claims 1 to 9, wherein, the battery cell further comprises a second insulating member disposed between the end cover and the electrode assembly, in the second direction, the second insulating member abuts against the protective member from a side facing away from the electrode assembly. 11.The battery cell of claim 10, wherein, in the first direction, the second insulating member does not protrude beyond the protective member. 12.The battery cell of any one of claims 1 to 9, wherein, the end cover is provided with a liquid injection hole, the end cover and the electrode assembly have a flow guide channel in communication with the liquid injection hole, and the protective member is provided with a first through hole in communication with the flow guide channel. 13.The battery cell of claim 12, wherein, the battery cell further comprises a second insulating member disposed between the end cover and the electrode assembly, in the second direction, the second insulating member abuts against the protective member from a side facing away from the electrode assembly, a side of the second insulating member facing the protective member is provided with a first groove, the first groove is open to a side of the protective member, and the first groove forms at least part of the flow guide channel. 14.The battery cell of claim 12, wherein, the battery cell further comprises a second insulating member disposed between the end cover and the electrode assembly, in the second direction, the second insulating member abuts against the protective member from a side facing away from the electrode assembly, a side of the second insulating member facing the end cover is provided with a second groove, the second groove is open to a side of the end cover, the second groove forms at least part of the flow guide channel, and the second groove is provided with a second through hole, the flow guide channel communicates with the first through hole via the second through hole. 15.The battery cell of any one of claims 12 to 14, wherein, the first through hole is provided with a plurality of first through holes arranged in a third direction, wherein the first direction, the second direction and the third direction are perpendicular to each other. 16.The battery cell of any one of claims 12 to 15, wherein, in the second direction, a total area of projections of all the first through holes in a same projection plane accounts for 10% to 50% of an area of a projection of the electrode assembly. 17.The battery cell of claim 16, wherein, an equivalent diameter of each of the first through holes is less than or equal to 15 mm. 18.The battery cell of any one of claims 1 to 17, wherein, a portion of the end cover is bent in the second direction to form a protruding portion, A portion of the end cover extends into the case and is connected to an inner peripheral surface of the case, and an edge of the end cover abuts against and is connected to an end edge of the case in the second direction.

19. The battery cell according to any one of claims 1 to 18, wherein A side of the protector facing the electrode assembly has a second adhesive layer.

20. The battery cell according to any one of claims 1 to 19, wherein The protector is a member of an insulating material.

21. The battery cell according to any one of claims 1 to 20, wherein A side of the protrusion portion facing the electrode assembly in the second direction has a receiving cavity that communicates with the accommodation space, A tab electrically connected to the first electrode terminal is accommodated at least in the receiving cavity.

22. The battery cell according to claim 21, wherein The battery cell includes a first electrode terminal and a second electrode terminal, The end cover has a first protrusion portion and a second protrusion portion, the first protrusion portion has a first receiving cavity, and the second protrusion portion has a second receiving cavity, A portion of the first electrode terminal is located in the first receiving cavity, and a portion of the second electrode terminal is located in the second receiving cavity.

23. A battery including a case and at least two battery cells according to any one of claims 1 to 22.

24. The battery according to claim 23, wherein The battery cells are arranged in the first direction, In adjacent battery cells, the first electrode terminal of one battery cell is electrically connected to the first electrode terminal of the other battery cell by a bus member.

25. The battery according to claim 23 or 24, wherein At least one case wall of the case has a boss formed by the case wall bulging in a direction away from the battery cells, the boss forms a receiving portion on a side facing the battery cells, In a direction perpendicular to the case wall in which the boss is formed, a projection of the protrusion portion does not exceed a projection of the boss, and the protrusion portion is at least partially accommodated in the receiving portion.

26. An electrical device including a plurality of battery cells according to any one of claims 1 to 22 or a battery according to any one of claims 23 to 25, the battery cells or the battery supplying power to the electrical device.

27. An energy storage device including a plurality of battery cells according to any one of claims 1 to 22 or a battery according to any one of claims 23 to 25, the battery cells or the battery storing and capable of supplying electrical energy.

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