Battery monomer, battery, power utilization device and energy storage device

Abstract

The embodiment of the utility model provides a battery monomer, a battery, a power utilization device and an energy storage device. The battery monomer comprises a shell, and the shell is provided with an accommodating space and an opening; the electrode assembly is contained in the containing space, the electrode assembly comprises a pole piece and a diaphragm which are stacked at least in the first direction, the side, close to the opening, of the electrode assembly is provided with an end face in the second direction, and the electrode assembly is provided with first side faces opposite to each other in the first direction; the end cover covers the opening in a sealing mode, the end cover comprises a main body part and a protruding part connected with the main body part, and the protruding part protrudes towards the side away from the electrode assembly in the second direction; the first electrode terminal is arranged on the convex part and is electrically connected with the electrode assembly; the protection piece covers part of the end face and extends to at least one first side face, in the same projection plane perpendicular to the second direction, the orthographic projection of the protection piece and the orthographic projection of the main body part are at least partially overlapped, and the first direction is perpendicular to the second direction. The influence of the diaphragm on the battery monomer strength is reduced.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of batteries, and particularly to a battery cell, a battery, an electrical device, and an energy storage device. Background Art

[0002] New energy batteries are increasingly widely used in life and industries. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also increasingly applied to the energy storage field and so on.

[0003] A battery includes at least one battery cell. A battery cell generally includes a housing with an opening, an electrode assembly accommodated in the housing, and an end cap covering the opening. If there are foreign objects in the connecting component between the end cap and the housing, the connection strength, sealing performance, etc. between the end cap and the housing may be adversely affected. Therefore, how to reduce the possibility of foreign objects entering the connecting component between the end cap and the housing and further reduce the risk of poor connection strength and sealing performance is one of the research topics in the industry. Summary of the Utility Model

[0004] To solve the above technical problems, the present application provides a battery cell, a battery, an electrical device, and an energy storage device that can reduce the risk of foreign objects such as diaphragms entering the connection position between the end cap and the housing.

[0005] In a first aspect, the embodiments of the present application provide a battery cell, including: a housing having an accommodation space and an opening; an electrode assembly accommodated in the accommodation space, the electrode assembly including at least a pole piece and a separator stacked along a first direction, along a second direction, the electrode assembly has an end face on a side close to the opening, and the electrode assembly has a first side face opposite to each other along the first direction; an end cap covering the opening, the end cap including a main body portion and a convex portion connected to the main body portion, along the second direction, the convex portion protrudes away from the electrode assembly; a first electrode terminal provided on the convex portion and electrically connected to the electrode assembly; a protection 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 positive projection of the protection member and the main body portion at least partially overlap, wherein the first direction and the second direction are perpendicular.

[0006] In the embodiments of the present application, since the first electrode terminal is disposed on the convex portion and electrically connected to the electrode assembly, a part of the structure of the first electrode terminal can be received in the convex portion, enabling the main body portion to be closer to the electrode assembly relative to the convex portion, thereby contributing to reducing the overall volume of the battery cell. Since in the same projection plane perpendicular to the second direction, the positive projection of the protection member and the main body portion at least partially overlap, the protection member can form a restraint on the separator near the main body portion, reducing the situation where the separator extends randomly, reducing the possibility of the separator extending into the connection position between the end cap and the housing, and contributing to enhancing the connection strength between the end cap and the housing, thereby enhancing the structural strength of the battery cell.

[0007] In some embodiments, the protection member covers a part of the end face and extends to the two first side faces.

[0008] Since the protection member covers the end face and the two first side faces, only one complete protection member extending from one first side face across the end face to the other first side face is required to complete the sealing of the separator, which is simple to operate and helps to improve the processing efficiency of the battery cell.

[0009] In some embodiments, two convex portions are provided on the end cap, the two convex portions are spaced along the third direction, the battery cell further includes a second electrode terminal, the first electrode terminal is disposed on one of the convex portions and electrically connected to the electrode assembly, the second electrode terminal is disposed on the other convex portion and electrically connected to the electrode assembly, along the second direction, the projection of the electrical connection portion between the first electrode terminal and the electrode assembly on the same projection plane as the protection member does not overlap, and the projection of the electrical connection portion between the second electrode terminal and the electrode assembly on the same projection plane as the protection member does not overlap, wherein the first direction, the second direction, and the third direction are perpendicular to each other.

[0010] Since the first electrode terminal is disposed on one convex portion and the second electrode terminal is disposed on the other convex portion, and the two convex portions are spaced apart, a part of the structure of the first electrode terminal and a part of the structure of the second electrode terminal can be respectively received in different convex portions, which can not only reduce the risk of conduction between the first electrode terminal and the second electrode terminal, but also enable the main body portion to be closer to the electrode assembly relative to the convex portion, thereby contributing to reducing the overall volume of the battery cell. Since along the second direction, the electrical connection portions between the first electrode terminal and the electrode assembly and between the second electrode terminal and the electrode assembly do not overlap with the projection of the protection member on the same projection plane, the protection member does not interfere with the electrical connection between the electrode terminal and the electrode assembly.

[0011] In some embodiments, along the second direction, the projection of the main body portion on the same projection plane as the protection member overlaps, and the projection of the convex portion on the same projection plane as the protection member does not overlap.

[0012] Therefore, even if there is a slight deviation in the installation position of the protective member, it is not easy to interfere with the electrical connection between the electronic terminal and the electrode assembly, reducing the requirement for assembly accuracy and facilitating the improvement of production efficiency.

[0013] In some embodiments, the battery cell further includes a first insulating member disposed between the housing and the electrode assembly, and along the second direction, the first insulating member does not extend beyond the end face.

[0014] Since the first insulating member is disposed between the housing and the electrode assembly, the electrode assembly can be insulated from the housing, reducing the probability of accidental conduction. Since along the second direction, the first insulating member does not extend beyond the end face of the electrode assembly, it is difficult for the first insulating member to extend into the connection position between the main body portion and the housing, which helps to improve the connection strength between the end cover and the housing, thereby enhancing the structural strength of the battery cell.

[0015] In some embodiments, there is a gap between the main body portion and the first insulating member along the second direction.

[0016] Since there is a gap between the lowest connection position of the main body portion and the housing and the first insulating member along the second direction, it is difficult for the first insulating member to extend into the connection position between the main body portion and the housing, which helps to improve the connection strength between the end cover and the housing, thereby enhancing the structural strength of the battery cell.

[0017] In some embodiments, the first insulating member is adhered to the protective member by an adhesive sheet. The adhesive sheet overlaps and covers the first insulating member from the side facing away from the electrode assembly, and the portion of the adhesive sheet that does not overlap with the covered first insulating member is adhered to the protective member.

[0018] Thus, one part of the adhesive sheet adheres to the first insulating member, and the other part of the adhesive sheet adheres to the protective member to be relatively fixed, making the first insulating member and the adhesive sheet relatively fixed. The structure is simple and the operation is convenient, which helps to improve the processing efficiency of the battery cell. Surrounding the electrode assembly with the first insulating member and the protective member helps to improve the insulation effect of the electrode assembly.

[0019] In some embodiments, the first insulating member includes a sheet-shaped insulating member. Along the direction perpendicular to the first insulating member, in the same projection plane, the projection of the first insulating member is located within the projection of the adhesive sheet.

[0020] Since the first insulating member includes a sheet-shaped insulating member, the sheet-shaped insulating member can closely fit the electrode assembly and the housing, occupying a small space and having a large coverage area, and can provide a good insulating effect between the electrode assembly and the housing. Since the projection of the first insulating member is located within the projection of the adhesive sheet in a direction perpendicular to the first insulating member, the adhesive sheet surrounds all the surfaces of the first insulating sheet away from the electrode assembly. The adhesive sheet surrounding the first insulating sheet can protect the first insulating sheet inside it, helping to reduce the breakage of the first insulating sheet. Moreover, the large-area adhesion between the adhesive sheet and the first insulating sheet helps to improve the adhesion strength of the first insulating sheet.

[0021] In some embodiments, a first adhesive layer is provided on the surface of the first insulating member facing the electrode assembly. A part of the first insulating member is adhered to the electrode assembly through the first adhesive layer, and another part of the first insulating member is adhered to the protection member through the first adhesive layer.

[0022] Thus, the first insulating member can closely fit on the surface of the electrode assembly, helping to improve the insulating effect of the electrode assembly relative to the housing. The first insulating member fixes part of the protection member between the first insulating member and the electrode assembly through the first adhesive layer, without the need to additionally provide an adhesive layer to fix the protection member. The structure is simple, which helps to simplify the processing steps and improve the production efficiency.

[0023] In some embodiments, the battery cell further includes a second insulating member, which is disposed between the end cap and the electrode assembly. Along the second direction, the second insulating member abuts against the protection member from the side facing away from the electrode assembly.

[0024] Since the second insulating member is disposed between the end cap and the electrode assembly, the electrode assembly can be insulated from the end cap, reducing the probability of accidental conduction. Since along the second direction, the second insulating member abuts against the protection member from the side facing away from the electrode assembly, the second insulating member can press the protection member to fix the protection member, so that the protection member presses the separator, making it difficult for the separator to extend into the connection position between the end cap and the housing, helping to improve the connection strength between the end cap and the housing, and thus improving the structural strength of the battery cell.

[0025] In some embodiments, along the first direction, the second insulating member does not extend beyond the protection member.

[0026] Thus, the size of the second insulating member in the first direction is smaller than the size of the opening in the first direction, reducing the probability of the second insulating member getting stuck in the housing. Moreover, when the end cap with an uneven bottom extends into the housing from the opening, the second insulating member is not on the extending path of the end cap and will not hinder the extension of the end cap.

[0027] In some embodiments, the end cover is provided with an injection hole, a guide channel connected to the injection hole is provided between the end cover and the electrode assembly, and a first through hole connected to the guide channel is opened on the portion of the end surface where the protective member is arranged.

[0028] Since the end cap is provided with an injection hole, and there is a flow guide channel connected to the injection hole between the end cap and the electrode assembly, the electrolyte can enter the flow guide channel from the injection hole, and the flow guide channel can guide at least part of the electrolyte to flow to the area in the shell away from the injection hole, reducing the accumulation of electrolyte in the area near the injection hole, expanding the flow range of the electrolyte in the shell, and helping to increase the penetration speed of the electrolyte. Since the protective member is provided on the end surface with a first through hole connected to the flow guide channel, the electrolyte infiltrates into the pole piece and the diaphragm through the first through hole, which helps to improve the infiltration efficiency.

[0029] In some embodiments, the battery cell also includes a second insulating member, which is arranged between the end cover and the electrode assembly. Along the second direction, the second insulating member abuts against the protective member from the side away from the electrode assembly. The second insulating member is provided with a first groove on the side facing the protective member. The first groove is open toward the side of the protective member, and the first groove forms at least a portion of the guide channel.

[0030] Since the second insulating member abuts against 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 maintain a stable connection state relative to the guide channel, which helps to maintain a stable infiltration efficiency. Since the second insulating member is provided with a first groove on the side facing the protective member, the electrolyte is guided by the first groove to the top of the protective member, enters the electrode assembly from the first through hole of the protective member, and achieves the infiltration of the electrode assembly by the electrolyte.

[0031] In some embodiments, the battery cell also includes a second insulating member, which is arranged between the end cover and the electrode assembly. Along the second direction, the second insulating member abuts against the protective member from the side away from the electrode assembly. The second insulating member is provided with a second groove on the side facing the end cover, and the second groove is open toward the side of the end cover. The second groove forms at least a part of the guide channel, and the second groove is provided with a second through hole. The guide channel is connected to the first through hole through the second through hole.

[0032] Since the second insulating member abuts against the protective member from the side facing away from the electrode assembly along the second direction, the second insulating member can press the protective member to fix the protective member, enabling the first through-hole to maintain a stable communication state relative to the diversion channel, which helps to maintain a stable infiltration efficiency. Since the second insulating member is provided with a second groove on the side facing the end cap and a second through-hole is formed in the second groove, the electrolyte is guided by the second groove above the protective member and flows into the first through-hole of the protective member and then into the electrode assembly through the second through-hole, realizing the infiltration of the electrolyte into the electrode assembly.

[0033] In some embodiments, a plurality of the 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.

[0034] Thus, the electrolyte can come into contact with a larger area of the electrode assembly, which helps the electrolyte to be uniformly infiltrated on the electrode assembly and improves the liquid injection efficiency.

[0035] In some embodiments, along the second direction, in the same projection plane, the total projected area of all the first through-holes accounts for 10% to 50% of the projected area of the electrode assembly.

[0036] Thus, it not only helps the total cross-sectional area of the first through-holes to meet the flow requirement of the electrolyte outflow, but also helps the structural strength of the protective member to meet the requirements.

[0037] In some embodiments, the equivalent diameter of each of the first through-holes is less than or equal to 15 millimeters.

[0038] Thus, it not only makes it difficult for the diaphragm to protrude from the first through-hole, but also helps the structural strength of the protective member to meet the requirements.

[0039] In some embodiments, a part of the end cap is bent along the second direction to form a convex portion, a part of the end cap extends into the housing and is connected to the inner peripheral surface of the housing, and the edge of the end cap abuts against and is connected to the end edge of the housing in the second direction.

[0040] Since a part of the end cap extends into the housing and is connected to the inner peripheral surface of the housing, the inner peripheral surface of the housing can limit the end cap, making it difficult for the end cap to shift in the first direction and the third direction. Since the edge of the end cap abuts against and is connected to the end edge of the housing in the second direction, the end edge of the housing supports the end cap, restricting the displacement of the end cap relative to the housing in the second direction, which helps to reduce the gap between the end cap and the housing and helps to enhance the connection strength between the end cap and the housing.

[0041] In some embodiments, the side of the protective member facing the electrode assembly has a second adhesive layer.

[0042] Thus, the protective member bonds the separator to the end face, improves the situation where the separator extends into the connection position between the end cap and the housing, helps to enhance the connection strength between the end cap and the housing, and thus enhances the structural strength of the battery cell.

[0043] In some embodiments, the protective member is made of an insulating material.

[0044] Thus, when the protective member contacts the electrode tab, it does not affect the insulation between the electrode tabs, which helps to improve the insulation effect of the electrode assembly relative to the housing.

[0045] In some embodiments, on one side of the convex portion facing the electrode assembly along the second direction, there is a storage cavity communicating with the accommodation space, and at least the tab electrically connected to the first electrode terminal is accommodated in the storage cavity.

[0046] Thus, by accommodating the tab electrically connected to the first electrode terminal in the storage cavity of the convex portion, it helps to make the main body portion closer to the electrode assembly relative to the convex portion, thereby helping to reduce the overall volume of the battery cell and helping to improve the volume utilization rate within the battery cell.

[0047] In some embodiments, the battery cell includes a first electrode terminal and a second electrode terminal, the end cap has a first convex portion and a second convex portion, the first convex portion has a first storage cavity, the second convex portion has a second storage cavity, a part of the first electrode terminal is located in the first storage cavity, and a part of the second electrode terminal is located in the second storage cavity.

[0048] Since the first electrode terminal is provided in the first convex portion and a part of the first electrode terminal is located in the first storage cavity, and the second electrode terminal is provided in the second convex portion and a part of the second electrode terminal is located in the second storage cavity, therefore, the two electrode terminals are respectively accommodated in relatively independent storage cavities, which can not only reduce the risk of conduction between the first electrode terminal and the second electrode terminal, but also help to make the main body portion closer to the electrode assembly relative to the convex portion, thereby helping to reduce the overall volume of the battery cell and helping to improve the volume utilization rate within the battery cell.

[0049] In a second aspect, an embodiment of the present application further provides a battery, including a box body and at least two battery cells as described above.

[0050] Since the battery includes battery cells with strong structural strength, the battery has strong use reliability.

[0051] In some embodiments, the battery cells are arranged along the first direction, and in adjacent battery cells, the first electrode terminal of one battery cell is electrically connected to the first electrode terminal of another battery cell through a bus bar.

[0052] Thus, the electrical connection between adjacent battery cells is achieved by providing a bus bar member.

[0053] In some embodiments, at least one wall of the box body has a boss, which is formed by the wall of the box body bulging towards the direction away from the battery cell. The boss forms a receiving portion on the side facing the battery cell. Along the direction perpendicular to the wall of the box body where the boss is formed, the projection of the raised portion does not exceed the projection of the boss, and at least part of the raised portion is received in the receiving portion.

[0054] Thus, by receiving the raised portion in the receiving portion of the boss, it helps to reduce the overall volume of the box body and improve the volume utilization rate inside the box body.

[0055] In a third aspect, an embodiment of the present application further provides an electrical device, including the battery cell or the battery as described above, and the battery cell or the battery supplies power to the electrical device.

[0056] Thus, the electrical device has strong reliability in use. Moreover, the space reserved for the battery or the battery cell in the electrical device can be reduced, or the overall energy of the battery can be increased while keeping the space unchanged, which helps to improve the layout freedom of the battery and its surrounding structures in the electrical device and helps to improve the battery life / standby ability of the electrical device.

[0057] In a fourth aspect, an embodiment of the present application further provides an energy storage device, including the battery cell or the battery as described above, and the battery cell or the battery is used to store electrical energy and can supply electrical energy.

[0058] Thus, the energy storage device has strong reliability in use. Moreover, the space reserved for the battery in the energy storage device can be reduced, or the overall energy of the battery can be increased while keeping the space unchanged, which helps to reduce the space occupied by the energy storage device or increase the energy storage capacity.

[0059] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specifically illustrates the specific embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 Schematic diagram of an electrical device being a vehicle provided by an embodiment of the present application;

[0061] Figure 2 Schematic diagram of a battery provided by an embodiment of the present application;

[0062] Figure 3 Schematic diagram of a battery cell provided by an embodiment of the present application;

[0063] Figure 4 Schematic diagram of an electrode assembly provided by an embodiment of the present application;

[0064] Figure 5 Schematic diagram of an electrode assembly provided by another embodiment of the present application;

[0065] Figure 6 Schematic diagram of a battery cell provided by another embodiment of the present application;

[0066] Figure 7 Schematic diagram of an electrode assembly provided by yet another embodiment of the present application;

[0067] Figure 8 Schematic diagram of a battery cell provided by yet another embodiment of the present application;

[0068] Figure 9 Schematic diagram of an electrode assembly provided by an embodiment of the present application with a first through hole provided in the protective member;

[0069] Figure 10 Front view of a battery cell provided by an embodiment of the present application;

[0070] Figure 11 is Figure 10 Cross-sectional schematic view of A-A in;

[0071] Figure 12 is Figure 11 Partial enlarged schematic view of part B in;

[0072] Figure 13 Top view of a battery cell provided by an embodiment of the present application;

[0073] Figure 14 is Figure 13 Cross-sectional schematic view of C-C in;

[0074] Figure 15 is Figure 14 Partial enlarged schematic view of part D in;

[0075] Figure 16 Schematic diagram of a second insulating member provided with a second groove provided by an embodiment of the present application;

[0076] Figure 17 Schematic diagram of a battery provided with a boss provided by an embodiment of the present application.

[0077] Description of reference numerals

[0078] 1000, Vehicle; 100, Battery; 101, Box; 1011, Boss; 102, Battery Cell; 200, Controller; 300, Motor; 10, Housing; 11, End Cap; 111, Main Body; 112, Protrusion; 112a, Receiving Cavity; 113, Liquid Injection Hole; 12, Electrode Assembly; 121, End Face; 122, First Side; 123, Second Side; 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 Channel; 191, First Groove; 192, Second Groove; 193, Second Through Hole; X, First Direction; Z, Second Direction; Y, Third Direction. Detailed Embodiment

[0079] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0080] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in this application are intended to cover non-exclusive inclusion.

[0081] In the description of the embodiments of the present application, the technical terms "first", "second", "third", "fourth", etc. are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, "a plurality" means more than two, unless otherwise specifically defined.

[0082] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The phrase does not necessarily refer to the same embodiment everywhere in the specification, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0083] In the description of the embodiments of the present application, the term " / and" is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B, which can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0084] In the description of the embodiments of the present application, the orientation or position relationship indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", and "circumferential" are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0085] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0086] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and may be direct contact or contact through an intermediate medium layer. It may be contact with essentially no interaction force between the two contacting parties, or it may be contact with interaction force between the two contacting parties.

[0087] Below, this application is described in detail.

[0088] New energy batteries are being used more and more widely in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also being increasingly used in areas such as energy storage.

[0089] The battery includes at least one battery cell, which generally includes a shell with an opening, an electrode assembly contained in the shell, and an end cap that covers the opening. If there is a foreign object (such as the diaphragm described below) in the connection between the end cap and the shell, the connection strength and sealing between the end cap and the shell may be adversely affected. The electrode assembly generally includes positive and negative electrode sheets and a diaphragm 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 diaphragm is generally longer than the electrode sheets.

[0090] However, the part of the separator that protrudes above the electrode plate may extend into the gap between the end cap and the housing, which may affect the sealing performance and connection strength between the end cap and the housing. Especially for a battery cell with a raised portion provided on the end cap, since the structures protruding from the surface of the electrode assembly (such as electrode tabs) can be centrally accommodated in the raised portion, the main body portion of the end cap without the raised portion can be set closer to the electrode assembly. This results in the separator being extremely likely to extend into the connection position between the main body portion and the housing, affecting the connection between the end cap and the housing, and thus reducing the structural strength of the battery cell. Therefore, how to reduce the influence of the separator on the strength of the battery cell is one of the problems in the industry.

[0091] The present application provides a battery cell capable of reducing the risk of the separator entering the connection position between the end cap and the housing.

[0092] Based on such a design concept, the inventors of the present application designed a battery cell, including: a housing having an accommodation space and an opening; an electrode assembly accommodated in the accommodation space, the electrode assembly including at least a electrode plate and a separator stacked along a first direction, along a second direction, the electrode assembly has an end face on the side close to the opening, and the electrode assembly has a first side face opposite to each other along the first direction; an end cap covering the opening, the end cap including a main body portion and a raised portion connected to the main body portion, along the second direction, the raised portion protrudes away from the electrode assembly; a first electrode terminal provided on the raised portion and electrically connected to the electrode assembly; a protection 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, at least part of the orthographic projection of the protection member overlaps with the main body portion, wherein the first direction and the second direction are perpendicular.

[0093] Since the first electrode terminal is provided on the raised portion and electrically connected to the electrode assembly, part of the structure of the first electrode terminal can be centrally accommodated in the raised portion, which can make the main body portion closer to the electrode assembly relative to the raised portion, thereby helping to reduce the overall volume of the battery cell. Since in the same projection plane perpendicular to the second direction, at least part of the orthographic projection of the protection member overlaps with the main body portion, the protection member can form a restraint on the separator near the main body portion, reducing the situation of the separator extending randomly, reducing the possibility of the separator extending into the connection position between the end cap and the housing, and helping to improve the connection strength between the end cap and the housing, thereby improving the structural strength of the battery cell.

[0094] The battery cell involved in the embodiments of the present application can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging to continue to be used.

[0095] The battery cell 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-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present application are not limited thereto.

[0096] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and removed back and forth 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 allow 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 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 copper foil.

[0097] In some embodiments, the electrode assembly is provided with a tab, which can conduct current from the electrode assembly. The tab includes a positive tab and a negative tab. The positive tab can be connected to the positive electrode current collector, and the negative tab can be connected to the negative electrode current collector.

[0098] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0099] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery, etc. There is no special limitation in this application.

[0100] In some embodiments, at least one electrode terminal is disposed on the housing, and the electrode terminal is electrically connected to the electrode tab. The electrode terminal and the electrode tab may be connected directly or through an adapter or the like.

[0101] The battery mentioned in the embodiments of the present application may 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 hybrid connection through a busbar.

[0102] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0103] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are accommodated in the case.

[0104] In some embodiments, the box body can be part of the chassis structure of a vehicle. For example, part of the box body can become at least part of the floor of the vehicle, or part of the box body can become at least part of the cross beams and longitudinal beams of the vehicle.

[0105] In some embodiments, the battery cell or battery can be applied to an energy storage device. The energy storage device includes an energy storage container, an energy storage electrical cabinet, etc.

[0106] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using battery cells or batteries, such as mobile phones, portable devices, laptop computers, battery cars, electric toys, electric tools, vehicles, ships, and spacecrafts, etc. For example, spacecrafts include airplanes, rockets, space shuttles, and spaceships, etc.

[0107] Next, with reference to the drawings, the electrical device in the embodiments of the present application will be described by taking the vehicle 1000 as an example.

[0108] Figure 1 FIG. is a schematic structural diagram of a vehicle 1000 provided in an embodiment of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. As Figure 1 shown, a battery 100 is disposed inside the vehicle 1000. The battery 100 can be disposed at the bottom, head, or 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 source of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start, navigation, and driving of the vehicle 1000.

[0109] In some embodiments of the present application, the battery 100 can not only be used as the operating power source of the vehicle 1000, but also as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0110] Next, a detailed description will be given with reference to the drawings.

[0111] Figure 2 Schematic diagram of a battery provided in an embodiment of the present application; Figure 3 Schematic diagram of a battery cell provided in an embodiment of the present application; Figure 4 Schematic diagram of an electrode assembly provided in an embodiment of the present application; Figure 5 Schematic diagram of an electrode assembly provided in another embodiment of the present application; Figure 6 Schematic diagram of a battery cell provided in another embodiment of the present application; Figure 7Schematic diagram of an electrode assembly provided by another embodiment of the present application; Figure 8 Schematic diagram of a battery cell provided by another embodiment of the present application; Figure 9 Schematic diagram of an electrode assembly provided by an embodiment of the present application with a first through hole provided in the protective member; Figure 10 Front view of a battery cell provided by an embodiment of the present application; Figure 11 is Figure 10 Cross-sectional schematic diagram of A-A in; Figure 12 is Figure 11 Partial enlarged schematic diagram of part B in; Figure 13 Top view of a battery cell provided by an embodiment of the present application; Figure 14 is Figure 13 Cross-sectional schematic diagram of C-C in; Figure 15 is Figure 14 Partial enlarged schematic diagram of part D in; Figure 16 Schematic diagram of a second insulating member provided with a second groove according to an embodiment of the present application; Figure 17 Schematic diagram of a battery provided with a boss according to an embodiment of the present application.

[0112] In a first aspect, an embodiment of the present application provides a battery cell 102, as Figures 3 to 10 shown, including: a housing 10, the housing 10 having an accommodation space and an opening; an electrode assembly 12, accommodated in the accommodation space, the electrode assembly 12 including at least pole pieces and a separator laminated in a first direction X, along a second direction Z, the electrode assembly 12 having an end face 121 on a side close to the opening, the electrode assembly 12 having a first side face 122 opposite to each other along the first direction X; an end cap 11, the end cap 11 covering the opening, the end cap 11 including a main body portion 111 and a convex portion 112 connected to the main body portion 111, along the second direction Z, the convex portion 112 protruding away from the electrode assembly 12; a first electrode terminal 13, provided on the convex portion 112 and electrically connected to the electrode assembly 12; 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 positive projection of the protective member 15 and the main body portion 111 at least partially overlap, wherein the first direction X and the second direction Z are perpendicular.

[0113] The battery cell 102 includes a housing 10, an electrode assembly 12, an end cap 11, a first electrode terminal 13, and a protective member 15.

[0114] The electrode assembly 12 includes pole pieces and a separator. The separator closely adheres to and covers the surface of the pole pieces, and the size of the separator is slightly larger than the size of the pole pieces. The electrode assembly 12 can be manufactured by a stacking process or a winding process, and the present application does not make any special limitations on the manufacturing process of the electrode assembly 12.

[0115] The electrode can include a positive electrode and a negative electrode. The positive electrode can include a positive current collector and a positive active material disposed on at least one surface of the positive current collector. The negative electrode can include a negative current collector.

[0116] As an example, the positive current collector has two surfaces opposite to each other in its own thickness direction, and the positive active material is disposed on any one or both of the two opposite surfaces of the positive current collector.

[0117] As an example, the positive current collector can be a metal foil or a composite current collector. For example, as the metal foil, aluminum or stainless steel with silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. can be used. The composite current collector can include a polymer material substrate layer and a metal layer. The composite current collector can be formed by forming a metal material (such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0118] As an example, the positive active material can include at least one of the following materials: lithium-containing phosphate, lithium transition metal oxide, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as battery positive active materials can also be used. These positive active materials can be used alone or in combination of two or more. Among them, examples of the lithium-containing phosphate can include, but are not limited to, lithium iron phosphate (such as LiFePO4 (which can also be abbreviated 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.

[0119] As an example, the negative current collector can be a metal foil, a foam metal or a composite current collector. For example, as the metal foil, aluminum or stainless steel with silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. can be used. The composite current collector can include a polymer material substrate layer and a metal layer. The foam metal can be foam nickel, foam copper, foam aluminum, foam alloy, or foam carbon, etc. The composite current collector can be formed by forming a metal material (such as copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.). In some embodiments, the material of the positive current collector can be aluminum, and the material of the negative current collector can be copper.

[0120] In some embodiments, the separator can be any well-known porous structure separator with 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, polyvinylidene fluoride, and ceramics.

[0121] Optionally, the electrode assembly 12 is fabricated using a stacking process. In some embodiments, the positive electrode plate and the negative electrode plate are bent back and forth multiple times, such that the positive electrode plate and the negative electrode plate are alternately stacked at least along the first direction X, and a separator is disposed at least between the positive electrode plate and the negative electrode plate. The separator and the electrode plates both extend in the second direction Z. Wherein, the first direction X is a direction perpendicular to the plane where the separator is located; the second direction Z is a direction parallel to the plane where the separator is located, and the second direction Z is perpendicular to the first direction X.

[0122] Similarly optionally, the electrode assembly 12 is fabricated using a winding process. At least one positive electrode plate, one negative electrode plate, and one separator are respectively provided. Along the first direction X, the positive electrode plate, the separator, and the negative electrode plate are sequentially attached, and a winding machine is used to wind the three, such that the three are alternately stacked at least along the first direction X. If the wound electrode assembly 12 is approximately cylindrical, then the first direction X is any radial direction of the wound electrode assembly 12; the second direction Z is the axial direction of the wound electrode assembly 12, and the second direction Z is perpendicular to the first direction X. If the wound electrode assembly 12 is approximately cubic, then the first direction X is a direction perpendicular to the plane where the separator is located; the second direction Z is a direction parallel to the plane where the separator is located, and the second direction Z is perpendicular to the first direction X.

[0123] On both sides of the electrode assembly 12 in the second direction Z, the separator protrudes relative to the electrode plates, and the separator and the electrode plates are distributed in a concave-convex shape. The surface where the end of the separator on either side of the electrode assembly 12 in the second direction Z is located can be regarded as the end face 121. The two side surfaces of the electrode assembly 12 in the first direction X are the complete surfaces of the electrode plates or the complete surfaces of the separator, and the two opposite side surfaces of the electrode assembly 12 in the first direction X can be regarded as the first side surfaces 122. The two side surfaces of the electrode assembly 12 in the third direction Y are complete surfaces. The two opposite side surfaces of the electrode assembly 12 in the third direction Y can be regarded as the second side surfaces 123. The first direction X, the second direction Z, and the third direction Y are perpendicular to each other.

[0124] The housing 10 encloses an accommodation space, and the housing 10 is configured with an opening facing 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 end face 121 of the electrode assembly 12 in the second direction Z faces the opening, and on this end face 121, the separator protrudes relative to the electrode plates, and the separator and the electrode plates are distributed in a concave-convex shape. 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 present application does not impose any specific limitations on the shape of the housing 10.

[0125] The end cover 11 seals the opening of the housing 10 to enclose the accommodation space. As Figure 3 , Figure 6 and Figure 8 shown, the end cover 11 includes a main body portion 111 and a protruding portion 112. A part of the end cover 11 protrudes in a direction away from the accommodation space to form the protruding portion 112, and the portion of the end cover 11 without the protruding portion 112 is the main body portion 111. The protruding portion 112 has a storage cavity 112a, and the storage cavity 112a communicates with the accommodation space and can be used to store part of the structure of the electrode assembly 12 and part of the structure of the first electrode terminal 13.

[0126] A first electrode terminal 13 is provided on the end cover 11, and the first electrode terminal 13 penetrates through the end cover 11. One end of the first electrode terminal 13 is placed in the accommodation space and electrically connected to the electrode assembly 12, and the other end of the first electrode terminal 13 exposes from the end cover 11 for external electrical connection. The first electrode terminal 13 can be arranged on the protruding portion 112 so that part of the structure of the first electrode terminal 13 is stored in the storage cavity 112a.

[0127] In some embodiments, the end cover 11 includes a sealing portion. Along the second direction Z, the projection of the sealing portion covers the projection of the opening, and one side surface of the sealing portion in the second direction Z abuts against one side surface of the housing 10 in the second direction Z. The position where the sealing portion and the housing 10 abut against each other can be connected by welding. The end cover 11 may further include a limiting portion, and the limiting portion is provided on the side of the sealing portion close to the accommodation space. The limiting portion protrudes from the surface of the sealing portion, and at least the surface of the limiting portion in the first direction X abuts against the inner wall surface of the housing 10.

[0128] The protection member 15 covers at least part of the end face 121 and presses the diaphragm near the connection position of the end cover 11 and the housing 10 on the end face 121. Specifically, the distance between the main body portion 111 and the electrode assembly 12 is closer than the distance between the protruding portion 112 and the electrode assembly 12. The diaphragm protruding from the end face 121 is easily extended into the connection position between the main body portion 111 of the end cover 11 and the housing 10. The protection member 15 is at least arranged on the diaphragm near the connection position of the main body portion 111 and the housing 10. In the same projection plane perpendicular to the second direction Z, the projection of the protection member 15 in the second direction Z and the projection of the main body portion 111 in the second direction Z at least partially overlap.

[0129] Further, the protective member 15 also covers at least one first side surface 122. The protective member 15 wraps the edge between the end face 121 and the first side surface 122, so that the diaphragm is completely isolated from the connection position of the main body portion 111 and the housing 10. In some embodiments, the protective member 15 can span from one side of the end face 121 in the first direction X to the other side, covering the part of the end face 121 whose projection overlaps with the main body portion 111 in the second direction Z and the two side edges in the first direction X of this part. Optionally, the protective member 15 also covers at least one second side surface 123. The protective member 15 can wrap the corner between the end face 121 and the first side surface 122 and / or the edge between the end face 121 and the second side surface 123.

[0130] In some embodiments, the protective member 15 can be configured as a film or a sheet. As an example, the protective member 15 can be a film such as a blue film that can provide insulation.

[0131] In the embodiments of the present application, since the first electrode terminal 13 is disposed on the protruding portion 112 and is electrically connected to the electrode assembly 12, a part of the structure of the first electrode terminal 13 can be centrally accommodated in the protruding portion 112, enabling 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 cell 102. Since in the same projection plane perpendicular to the second direction Z, the positive projection of the protective member 15 and the main body portion 111 at least partially overlap, the protective member 15 can form a restraint on the diaphragm close to the main body portion 111, reducing the situation where the diaphragm extends randomly, reducing the possibility of the diaphragm extending into the connection position of the end cover 11 and the housing 10, and helping to improve the connection strength between the end cover 11 and the housing 10, thereby enhancing the structural strength of the battery cell 102. Since the first electrode terminal 13 is disposed on the protruding portion 112 and is electrically connected to the electrode assembly 12, structures such as the terminal plate and the adapter plate of the first electrode terminal 13 and the tab 124 of the electrode assembly 12 can be centrally accommodated in the protruding portion 112, enabling 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 cell 102. Since the electrode assembly 12 is placed in the accommodation space and the end cover 11 closes the opening of the housing 10, the housing 10 and the end cover 11 can enclose and protect the electrode assembly 12.

[0132] In some embodiments, as Figure 4 shown, the two protective members 15 are arranged at intervals along the first direction X. One protective member 15 covers a part of the end face 121 and extends to one first side surface 122, and the other protective member 15 covers a part of the end face 121 and extends to the other first side surface 122.

[0133] In a specific embodiment, the convex portion 112 extends from one side of the end cap 11 in the first direction X to the other side. The convex portions 112 are provided on both sides of the end cap 11 in the third direction Y, and the main body portion 111 is located between the convex portions 112. On the end face 121, a protective member 15 is provided at a portion where the projection of the main body portion 111 along the second direction Z coincides with the end face 121, and the protective member 15 is provided at least at the edge between the end face 121 and the first side face 122.

[0134] Specifically, the protective members 15 spaced apart from each other in the first direction X are provided at the portion of the end face 121 facing the main body portion 111. The protective member 15 on one side of the end face 121 in the first direction X extends towards the adjacent first side face 122, and the protective member 15 on the other side of the end face 121 in the first direction X extends towards the adjacent first side face 122.

[0135] Optionally, the protective member 15 is selected as a blue film, and one side surface of the blue film has adhesiveness. A part of the blue film is attached to the portion of the end face 121 facing the main body portion 111. The blue film is configured in a strip shape and extends along the third direction Y, and the length of the blue film in the third direction Y is not less than the length of the main body portion 111 in the third direction Y; 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 between the main body portion 111 and the housing 10.

[0136] The convex portion 112 can be located at any position of the end cap 11. If there is a gap on one side of the convex portion 112 relative to the third direction Y of the end cap 11, the main body portion 111 is located on this side of the end cap 11 in the third direction Y. Along the second direction Z, the portion of the end face 121 facing the main body portion 111 has three edges, and the diaphragm near these three edges is very likely to extend into the connection position between the main body portion 111 and the housing 10, and the protective members 15 can be respectively provided to cover these three edges.

[0137] Specifically, at least three protective members 15 are provided. Two of the three protective members 15 extend along the third direction Y, and the remaining one protective member 15 extends along the first direction X. The two protective members 15 extending along the third direction Y are spaced apart from each other and provided on both sides of the end face 121 in the first direction X, and these two protective members 15 extend from the end face 121 to the first side face 122 in directions away from each other. The protective member 15 extending along the first direction X is provided on one side of the end face 121 in the third direction Y and corresponds to the position of the main body portion 111.

[0138] Optionally, one protective member 15 is provided to extend along the edge of the end face 121 from one side of the end face 121 in the first direction X and bend until it extends to the other side of the end face 121 in the first direction X, forming a covering for the edge of the end face 121 opposite to the main body portion 111.

[0139] Since the protective members 15 are provided to cover the two side edges of the electrode assembly 12 respectively, each protective member 15 extending from the end face 121 to a first side face 122 can separate the diaphragm from the connection positions of the end cover 11 and the housing 10. Therefore, it is possible to improve the situation where the diaphragm extends into the connection positions of the end cover 11 and the housing 10, and at the same time, the material consumption of the protective members 15 can be saved.

[0140] In some embodiments, referring still to Figure 4 , the two protective members 15 are arranged at intervals from each other in the third direction Y.

[0141] Specifically, as Figure 7 shown, protective members 15 are provided at intervals from each other in the third direction Y at the part of the end face 121 facing the main body portion 111. The protective member 15 on one side of the third direction Y of the end face 121 extends towards the adjacent second side face 123, and the protective member 15 on the other side of the third direction Y of the end face 121 extends towards the adjacent second side face 123.

[0142] Optionally, the protective member 15 is selected as a blue film, and one side surface of the blue film has adhesiveness. A part of the blue film is pasted on the part of the end face 121 facing the main body portion 111. The blue film is configured as a strip and extends along the first direction X, and the length of the blue film in the first direction X is not less than the length of the main body portion 111 in the first direction X; another part of the blue film is pasted on the second side face 123, and the blue film isolates the diaphragm from the connection positions of the main body portion 111 and the housing 10.

[0143] In an alternative embodiment, the convex portion 112 is configured to have intervals from the two sides of the end cover 11 in the first direction X and the third direction Y respectively. Exemplarily, the convex portion 112 is formed on the end cover 11 by a stamping process. The two protective members 15 are respectively arranged on the two sides of the end face 121 in the first direction X, and a part of each protective member 15 is arranged on the end face 121, and the other part of the protective member 15 is arranged on the adjacent first side face 122.

[0144] In some embodiments, as Figure 5 , Figure 7 and Figure 9 shown, the protective member 15 covers a part of the end face 121 and extends to the two first side faces 122.

[0145] The projection of the main body portion 111 in the second direction Z has a coincident area on the end face 121, and the protective member 15 can be provided to cover all the coincident areas. The end cover 11 extends along the first direction X, and the position on the end cover 11 where the convex portion 112 is not provided is the main body portion 111. The protective member 15 extends from the first side face 122 on one side of the first direction X towards the end face 121 and covers all the coincident areas, and then extends to the first side face 122 on the other side of the first direction X. The protective member 15 extending to the first side face 122 can cover a part or all of the first side face 122.

[0146] Since the protective member 15 covers the end face 121 and the two first side faces 122 , only one complete protective member 15 is needed to extend from one first side face 122 across the end face 121 to the other first side face 122 to complete the closure of the diaphragm. This is simple to operate and helps to improve the processing efficiency of the battery cell 102 .

[0147] In some embodiments, the end cap 11 is provided with a protrusion 112. The battery cell 102 further includes a second electrode terminal 14, which is separated from the first electrode terminal 13 and disposed in the protrusion 112, and the second electrode terminal 14 is electrically connected to the electrode assembly 12, and the protrusion 112 can accommodate part of the second electrode terminal 14 and part of the first electrode terminal 13.

[0148] In some embodiments, Figures 8 to 10 , Figure 13 As shown, two protrusions 112 are provided on the end cover 11, and the two protrusions 112 are arranged at intervals along the third direction Y. The battery cell 102 also includes a second electrode terminal 14. The first electrode terminal 13 is provided on one of the protrusions 112 and is electrically connected to the electrode assembly 12. The second electrode terminal 14 is provided on the other protrusion 112 and is electrically connected to the electrode assembly 12. Along the second direction Z, the electrical connection between the first electrode terminal 13 and the electrode assembly 12 does not overlap with the projection of the protective member 15 on the same projection plane, and the electrical connection between the second electrode terminal 14 and the electrode assembly 12 does not overlap with the projection of the protective member 15 on the same projection plane, wherein the first direction X, the second direction Z and the third direction Y are perpendicular to each other.

[0149] The end cap 11 is provided with two protrusions 112, each protrusion 112 can extend along the first direction X, and the two protrusions 112 are arranged at intervals along the third direction Y. The two protrusions 112 can be arranged at any position of the end cap 11, for example, the two protrusions 112 can be arranged on both sides of the third direction Y of the end cap 11.

[0150] The battery cell 102 further includes a second electrode terminal 14, and the second electrode terminal 14 and the first electrode terminal 13 are arranged to be spaced apart from each other. The first electrode terminal 13 may be arranged at one protrusion 112, and the second electrode terminal 14 may be arranged at another protrusion 112. The first electrode terminal 13 and the second electrode terminal 14 are electrically connected to the electrode assembly 12, respectively. The protective member 15 may be extended from an area facing the end surface 121 of the main body 111 to an area facing the end surface 121 of the protrusion 112, and avoids a position where the first electrode terminal 13 and the electrode assembly 12 are electrically connected, and a position where the second electrode terminal 14 and the electrode assembly 12 are electrically connected.

[0151] In a specific embodiment, the electrode assembly 12 includes a positive electrode tab, a negative electrode tab, and a separator. The positive electrode tab has a positive electrode ear protruding from the end face 121, and the positive electrode ear is electrically connected to the first electrode terminal 13. The negative electrode tab has a negative electrode ear protruding from the end face 121, and the negative electrode ear is electrically connected to the second electrode terminal 14. Along the second direction Z, a protruding portion 112 and the projection of the positive electrode ear on the same projection plane at least partially overlap, so that at least part of the positive electrode ear is received in the protruding portion 112; along the second direction Z, the other protruding portion 112 and the projection of the negative electrode ear on the same projection plane at least partially overlap, so that at least part of the negative electrode ear is received in the protruding portion 112.

[0152] The first electrode terminal 13 penetrates through the protruding portion 112, and a part of the first electrode terminal 13 is received in the protruding portion 112. One end of the first electrode terminal 13 is electrically connected to the positive electrode ear, and the other end of the first electrode terminal 13 is disposed on the surface of the protruding portion 112 away from the accommodation space. The second electrode terminal 14 penetrates through the protruding portion 112, and a part of the second electrode terminal 14 is received in the protruding portion 112. One end of the second electrode terminal 14 is electrically connected to the negative electrode ear, and the other end of the second electrode terminal 14 is disposed on the surface of the protruding portion 112 away from the accommodation space. The protective member 15 covers the end face 121 facing the main body portion 111 and can extend to the edge of the closest positive electrode ear and / or negative electrode ear.

[0153] Since the first electrode terminal 13 is disposed in one protruding portion 112 and the second electrode terminal 14 is disposed in the other protruding portion 112, and the two protruding portions 112 are spaced apart, therefore, structures such as the terminal plate and the adapter plate of the first electrode terminal 13 and structures such as the terminal plate and the adapter plate of the second electrode terminal 14 can be respectively received in different protruding portions 112, which can not only reduce the risk of conduction between 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 cell 102. Since along the second direction Z, the electrical connection portions between the first electrode terminal 13 and the electrode assembly 12 and the electrical connection portions between 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, therefore, the protective member 15 does not interfere with the electrical connection between the electrode terminal and the electrode assembly 12.

[0154] 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 overlap, and the projection of the protruding portion 112 and the protective member 15 on the same projection plane does not overlap.

[0155] As Figure 15 shown, there is still a little distance between the end of the protective member 15 extending along the third direction Y and the protruding portion 112. Along the third direction Y, the protective member 15 is entirely within the range of the main body portion 111.

[0156] Thus, even if there is a slight deviation in the setting position of the protective member 15, it is not easy to interfere with the electrical connection between the electronic terminal and the electrode assembly, reducing the requirement for assembly accuracy and facilitating the improvement of production efficiency.

[0157] In some embodiments, such as Figure 11 and Figure 12 shown, the battery cell 102 further includes a first insulating member 16. The first insulating member 16 is disposed between the housing 10 and the electrode assembly 12. Along the second direction Z, the first insulating member 16 does not extend beyond the end face 121.

[0158] In some embodiments, along the second direction Z, 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.

[0159] The battery cell 102 further includes a first insulating member 16. The first insulating member 16 itself has insulation properties. Exemplarily, the first insulating member 16 is a mylar sheet. The first insulating member 16 is disposed between the housing 10 and the electrode assembly 12.

[0160] In an alternative embodiment, the first insulating members 16 are respectively disposed on the first side face 122, the second side face 123 and the face opposite to the end face 121 of the electrode assembly 12. The first insulating member 16 itself has a certain thickness, so that there is a gap between the region of the electrode assembly 12 where the first insulating member 16 is not provided and the housing 10, thereby insulating the electrode assembly 12 from the housing 10.

[0161] In another alternative embodiment, the first insulating member 16 is configured as a box shape with one side open. The electrode assembly 12 is placed inside the first insulating member 16, so that the first insulating member 16 covers the first side face 122, the second side face 123 and the face opposite to the end face 121 of the electrode assembly 12, thereby realizing insulation between the electrode assembly 12 and the housing 10.

[0162] To prevent the first insulating member 16 from extending into the connection position between the housing 10 and the end cover 11, along the second direction Z, a gap can be provided between the first insulating member 16 and the connection position of the main body portion 111 and the housing 10. The first insulating member 16 can also be extended between the protective member 15 and the electrode assembly 12.

[0163] In a specific embodiment, the first insulating member 16 is configured to be a box-shaped with one side open around the first side surface 122, the second side surface 123 and the surface facing the end surface 121 of the electrode assembly 12, and a notch is provided on the side of the first insulating member 16 facing the end cover 11. Along the second direction Z, there is a gap between the area of ​​the first insulating member 16 facing the protrusion 112 and the connection position of the protrusion 112 and the shell 10, and there is a gap between the area of ​​the first insulating member 16 facing the main body 111 and the connection position of the main body 111 and the shell 10, and the length of the area of ​​the first insulating member 16 facing the main body 111 is less than the length of the area facing the protrusion 112 to form a notch.

[0164] Exemplarily, the distance between the first insulating member 16 and the lowest connection position between the end cover 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.

[0165] Since the first insulating member 16 is disposed between the housing 10 and the electrode assembly 12, the electrode assembly 12 can be insulated from the housing 10, reducing the probability of accidental conduction. Since there is a gap between the lowest connection position of the main body 111 and the housing 10 and the first insulating member 16 along the second direction Z, it is difficult for the first insulating member 16 to extend into the connection position of the main body 111 and the housing 10, which helps to improve the connection strength between the end cap 11 and the housing 10, thereby improving the structural strength of the battery cell 102.

[0166] In some embodiments, see Figure 12 The first insulating member 16 is bonded to the protective member 15 via an 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 with the covered first insulating member 16 is bonded to the protective member 15 .

[0167] One side of the adhesive sheet 17 is sticky. Along the second direction Z, the projection of the adhesive sheet 17 on the same projection plane of the main body 111 at least partially overlaps. A portion of the adhesive sheet 17 is bonded to the surface of the first insulating member 16 away from the electrode assembly 12, and another portion of the adhesive sheet 17 is bonded 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, or between the first insulating member 16 and the adhesive sheet 17.

[0168] If there is a gap between the first insulating member 16 and the protective member 15, a portion of the adhesive sheet 17 may be bonded to the protective member 15, a portion may be bonded to the electrode assembly 12, and the remaining portion may be bonded to the first insulating member 16. If the length of the first insulating member 16 facing the protrusion 112 in the second direction Z exceeds the length of the electrode assembly 12 in the second direction Z, the adhesive sheet 17 may be provided on the first insulating member 16 facing the main body 111.

[0169] Thus, a part of the adhesive sheet 17 adheres to the first insulating member 16, and the other part of the adhesive sheet 17 adheres to the protection member 15 and is relatively fixed, making the first insulating member 16 and the adhesive sheet 17 relatively fixed. The structure is simple and the operation is convenient, which helps to improve the processing efficiency of the battery cell 102. The first insulating member 16 and the protection member 15 surround the electrode assembly 12, which helps to improve the insulation effect of the electrode assembly 12.

[0170] In some embodiments, the first insulating member 16 includes a sheet-shaped insulating member. Along a direction perpendicular to the first insulating member 16, within the same projection plane, the projection of the first insulating member 16 is located within the projection of the adhesive sheet 17.

[0171] The first insulating member 16 may include a sheet-shaped insulating member and a block-shaped insulating member. A sheet-shaped insulating member is provided on the surface of the first insulating member 16 close to the housing 10. Along a direction perpendicular to the first insulating member 16, within the same projection plane, the projection of the first insulating member 16 is located within the projection of the adhesive sheet 17, that is, the sheet-shaped insulating member covers the entire first insulating member 16. Optionally, both sides of the sheet-shaped insulating member have adhesiveness.

[0172] 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, occupies a small space, has a large coverage area, and can provide a good insulation effect between the electrode assembly 12 and the housing 10. Since 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, the adhesive sheet 17 surrounds all the surfaces of the first insulating sheet away from the electrode assembly 12. The adhesive sheet 17 surrounding the first insulating sheet can protect the first insulating sheet inside it, which helps to reduce the damage of the first insulating sheet. Moreover, 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.

[0173] In some embodiments, a first adhesive layer is provided on the surface of the first insulating member 16 facing the electrode assembly 12. A part of the first insulating member 16 is adhered to the electrode assembly 12 through the first adhesive layer, and the other part of the first insulating member 16 is adhered to the protection member 15 through the first adhesive layer.

[0174] A first adhesive layer is provided on the surface of the first insulating member 16 facing the electrode assembly 12. The first insulating member 16 is adhered to the electrode assembly 12 through the first adhesive layer. Along a direction perpendicular to the first insulating member 16, within the same projection plane, the projections of the first insulating member 16 and the protection member 15 overlap, and the first insulating member 16 is adhered to the protection member 15 through the first adhesive layer. Further, a first adhesive layer is also provided on the surface of the first insulating member 16 facing the housing 10.

[0175] In an optional embodiment, the first insulating member 16 is bent and extended toward the end face 121, and along the second direction Z, within the same projection plane, the projection of the first insulating member 16 is located within the projection of the protection member 15.

[0176] Thus, the first insulating member 16 can be closely attached to 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 protection member 15 between the first insulating member 16 and the electrode assembly 12 through the first adhesive layer, without the need to additionally provide an adhesive layer to fix the protection member 15. The structure is simple, which helps to simplify the processing steps and improve the production efficiency.

[0177] In some embodiments, as Figures 11 to 16 shown, the battery cell 102 further includes a second insulating member 18. The second insulating member 18 is disposed between the end cover 11 and the electrode assembly 12, and along the second direction Z, the second insulating member 18 abuts against the protection member 15 from the side facing away from the electrode assembly 12.

[0178] The battery cell 102 further includes a second insulating member 18. The second insulating member 18 is disposed between the end cover 11 and the electrode assembly 12 and can press the protection member 15 against the end face 121.

[0179] The second insulating member 18 has insulation properties. Exemplarily, the second insulating member 18 is a lower plastic.

[0180] 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 along the second direction Z, the second insulating member 18 abuts against the protection member 15 from the side facing away from the electrode assembly 12, the second insulating member 18 can press the protection member 15 to fix the protection member 15, so that the protection member 15 presses the separator, making it difficult for the separator to extend into the connection position between the end cover 11 and the housing 10, which helps to improve the connection strength between the end cover 11 and the housing 10, and thus improve the structural strength of the battery cell 102.

[0181] In some embodiments, along the first direction X, the second insulating member 18 does not extend beyond the protection member 15.

[0182] Thus, the dimension of the second insulating member 18 in the first direction X is smaller than the dimension of the opening in the first direction X, reducing the probability of the second insulating member 18 getting stuck in the housing 10. And when the end cover 11 with an uneven bottom extends into the housing 10 from the opening, the second insulating member 18 is not on the insertion path of the end cover 11 and will not hinder the insertion of the end cover 11.

[0183] In some embodiments, as Figure 8 and Figure 15As shown, the end cap 11 is provided with a liquid injection hole 113. There is a diversion channel 19 communicating with the liquid injection hole 113 between the end cap 11 and the electrode assembly 12. A first through hole 151 communicating with the diversion channel 19 is provided in a part of the protective member 15 disposed on the end face 121.

[0184] The number of the liquid injection holes 113 can be one or multiple. The liquid injection holes 113 penetrate through the end cap 11 to communicate the accommodation space with the outside, so that the electrolyte can enter the accommodation space through the liquid injection holes 113.

[0185] There is a gap between the end cap 11 and the electrode assembly 12, and a diversion channel 19 is formed in this gap. The diversion channel 19 can be a part of this gap or formed by the structure within the battery cell 102 surrounding in the gap. The diversion channel 19 opens towards the electrode assembly 12.

[0186] In an alternative embodiment, the protective member 15 extends and bends from one first side face 122 towards the end face 121, covers a part of the end face 121 and then extends and bends towards the other first side face 122. The electrolyte flows from the open position of the diversion channel 19 onto the protective member 15, and a first through hole 151 is provided in the part of the protective member 15 located on the end face 121, and the electrolyte passes through the first through hole 151 to soak the electrode assembly 12.

[0187] In another alternative embodiment, the protective members 15 are arranged at intervals along the first direction X. If along the second direction Z, the protective member 15 and the open area of the diversion channel 19 overlap on the same projection plane, then a first through hole 151 is provided at the position of the protective member 15 facing the open area of the diversion channel 19. If along the second direction Z, the protective member 15 and the open area of the diversion channel 19 do not overlap on the same projection plane, then the electrolyte flows directly from the open position of the diversion channel 19 onto the motor assembly, and a first through hole 151 may not be provided on the protective member 15.

[0188] In some embodiments, the liquid injection hole 113 is provided in the convex portion 112. The side of the convex portion 112 facing the electrode assembly 12 has a storage cavity 112a, and the storage cavity 112a communicates with the accommodation space. The liquid injection hole 113 communicates with the diversion channel 19 through the storage cavity 112a. The storage cavity 112a can temporarily accumulate the electrolyte and reduce the probability of overflow due to excessive injection of the electrolyte.

[0189] In some embodiments, convex portions 112 are respectively provided on both sides of the end cap 11 in the third direction Y, and liquid injection holes 113 are provided on each convex portion 112, and the diversion channel 19 communicates with the storage cavities 112a on both sides. This enables the electrolyte to have a larger flow range and can meet the liquid injection requirements at multiple positions on the electrode assembly 12.

[0190] Since the end cap 11 is provided with a liquid injection hole 113 and there is a diversion channel 19 communicating with the liquid injection hole 113 between the end cap 11 and the electrode assembly 12, the electrolyte can enter the diversion channel 19 from the liquid injection hole 113, and the diversion channel 19 can guide at least part of the electrolyte to flow to the area in the housing 10 far from the liquid injection hole 113, reducing the situation where the electrolyte accumulates in the area near the liquid injection hole 113, expanding the flow range of the electrolyte in the housing 10, and helping to improve the penetration speed of the electrolyte. Since the part of the protective member 15 provided on the end face 121 is provided with a first through hole 151 communicating with the diversion channel 19, the electrolyte infiltrates the electrode plate and the separator through the first through hole 151, which helps to improve the infiltration efficiency.

[0191] In some embodiments, as Figure 11 and Figure 12 shown, the battery cell 102 further includes a second insulating member 18. The second insulating member 18 is disposed between the end cap 11 and the electrode assembly 12. Along the second direction Z, the second insulating member 18 abuts against the protective member 15 from the side facing away from the electrode assembly 12. A first groove 191 is provided on the side of the second insulating member 18 facing the protective member 15. The first groove 191 is open on the side facing the protective member 15, and the first groove 191 forms at least part of the diversion channel 19.

[0192] The diversion channel 19 can be jointly formed by the second insulating member 18 and the end face 121. The second insulating member 18 is located between the end cap 11 and the protective member 15. A first groove 191 is opened on the side of the second insulating member 18 facing the protective member 15. The first groove 191 extends along the third direction Y. The first groove 191 communicates with the liquid injection hole 113. The first groove 191 is open on the side facing the protective member 15 and jointly forms the diversion channel 19 with the protective member 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.

[0193] Exemplarily, the second insulating member 18 can be made of a plastic material, and the plastic material is manufactured by an injection molding process to form the second insulating member 18 with the first groove 191.

[0194] Since along the second direction Z, the second insulating member 18 abuts against the protective member 15 from the side facing away from the electrode assembly 12, the second insulating member 18 can press the protective member 15 to fix the protective member 15, so that the first through hole 151 can maintain a stable communication state relative to the diversion channel 19, which helps to maintain a stable infiltration efficiency. Since the first groove 191 is provided on the side of the second insulating member 18 facing the protective member 15, the electrolyte is guided above the protective member 15 by the first groove 191 and enters the electrode assembly 12 through the first through hole 151 of the protective member 15, realizing the infiltration of the electrolyte into the electrode assembly 12.

[0195] In some embodiments, as Figure 16 shown, the battery cell 102 further includes a second insulating member 18 disposed between the end cap 11 and the electrode assembly 12. Along the second direction Z, the second insulating member 18 abuts against the protective member 15 from the side facing away from the electrode assembly 12. On the side of the second insulating member 18 facing the end cap 11, there is a second groove 192. The side of the second groove 192 facing the end cap 11 is open. The second groove 192 forms at least part of the diversion channel 19. The second groove 192 is provided with a second through hole 193. The diversion channel 19 communicates with the first through hole 151 through the second through hole 193.

[0196] The diversion channel 19 can be separately formed by enclosing the second insulating member 18. The second insulating member 18 is located between the end cap 11 and the protective member 15. On the side of the second insulating member 18 facing the end cap 11, there is a second groove 192. The second groove 192 extends along the third direction Y. The second groove 192 communicates with the liquid injection hole 113. A second through hole 193 is opened in the second groove 192. Along the second direction Z, the projection of the second through hole 193 coincides with the projection of the first through hole 151 in the same projection plane, so that the second through hole 193 communicates 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 thus enters the electrode assembly 12 through the first through hole 151.

[0197] Since along the second direction Z, the second insulating member 18 abuts against the protective member 15 from the side facing away from the electrode assembly 12, the second insulating member 18 can press the protective member 15 to fix the protective member 15, so that the first through hole 151 can maintain a stable communication state relative to the diversion channel 19, which helps to maintain a stable infiltration efficiency. Since the second insulating member 18 is provided with a second groove 192 on the side facing the end cap 11 and the second through hole 193 is opened in the second groove 192, the electrolyte is guided above the protective member 15 by the second groove 192 and flows into the first through hole 151 of the protective member 15 from the second through hole 193 to enter the electrode assembly 12, realizing the infiltration of the electrolyte into the electrode assembly 12.

[0198] In some embodiments, as Figure 9 shown, there are a plurality of first through holes 151. 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.

[0199] There are a plurality of first through holes 151, and the first through holes 151 can be evenly 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. The present application does not make any special limitations on the size and shape of the first through hole 151.

[0200] Optionally, a plurality of second channels are provided corresponding to the first channel and arranged along the third direction Y. Thus, the electrolyte can come into contact with a larger area of the electrode assembly 12, which helps the electrolyte to uniformly infiltrate on the electrode assembly 12 and improves the liquid injection efficiency.

[0201] In some embodiments, along the second direction Z, within the same projection plane, the total projected area of all the first through-holes 151 accounts for 10% to 50% of the projected area of the electrode assembly 12.

[0202] Along the second direction Z, within the same projection plane, the ratio of the total projected area of all the first through-holes 151 to the projected area of the electrode assembly 12 can be 10%, 22%, 30%, 45%, 50%, etc.

[0203] Optionally, the total projected area of all the second through-holes 193 accounts for 10% to 50% of the projected area of the electrode assembly 12.

[0204] Thus, it helps to make the total cross-sectional area of the first through-holes 151 meet the flow rate requirements of the electrolyte outflow, and also helps to make the structural strength of the protection member 15 meet the requirements.

[0205] In some embodiments, the equivalent diameter of each first through-hole 151 is less than or equal to 15 mm.

[0206] 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.

[0207] Optionally, the equivalent diameter of the second through-hole 193 is less than or equal to 15 mm.

[0208] Thus, it not only makes it difficult for the separator to protrude from the first through-holes 151, but also helps to make the structural strength of the protection member 15 meet the requirements.

[0209] In some embodiments, a part of the end cap 11 is bent along the second direction Z to form a convex portion 112. A part of the end cap 11 extends into the housing 10 and is connected to the inner peripheral surface of the housing 10. The edge of the end cap 11 abuts against and is connected to the end edge of the housing 10 in the second direction Z.

[0210] A part of the end cap 11 is bent along the second direction Z to form a convex portion 112. A raised portion is provided at a position corresponding to the convex portion 112 on the edge of the housing 10 in the second direction Z. The raised portions are spaced apart from each other along the first direction X and together with the convex portion 112 enclose a storage cavity 112a. A part of the end cap 11 extends into the housing 10 and is connected to the inner peripheral surface of the housing 10. The edge of the end cap 11 abuts against and is connected to the end edge of the housing 10 in the second direction Z.

[0211] In a specific embodiment, the end cap 11 includes a sealing portion and a limiting portion. Along the second direction Z, within the same projection plane, the projection of the opening is located within the projection of the sealing portion. One side surface of the sealing portion in the second direction Z abuts against one side surface of the housing 10 in the second direction Z, and the position where the sealing portion and the housing 10 abut against each other can be connected by welding. The limiting portion is provided on one side of the sealing portion close to the accommodating space, the limiting portion protrudes from the surface of the sealing portion, and at least the surface of the limiting portion in the first direction X abuts against the inner wall surface of the housing 10.

[0212] Since a part of the end cap 11 extends into the housing 10 and is connected to the inner peripheral surface of the housing 10, the inner peripheral surface of the housing 10 can limit the end cap 11, making it difficult for the end cap 11 to shift in the first direction X and the third direction Y. Since the edge of the end cap 11 abuts against and is connected to the end edge of the housing 10 in the second direction Z, the end edge of the housing 10 in the second direction Z supports the end cap 11, restricting the displacement of the end cap 11 relative to the housing 10 in the second direction Z, which helps to reduce the gap between the end cap 11 and the housing 10 and helps to enhance the connection strength between the end cap 11 and the housing 10.

[0213] In some embodiments, one side of the protective member 15 facing the electrode assembly 12 has a second adhesive layer.

[0214] The protective member 15 is adhered to the electrode assembly 12 through the second adhesive layer. A second adhesive layer can also be provided on the side of the protective member 15 facing the end cap 11, and the second insulating member 18 is adhered to the protective member 15 through the second adhesive layer.

[0215] Thus, the protective member 15 adheres the separator to the end face 121, improving the situation where the separator extends into the connection position between the end cap 11 and the housing 10, which helps to enhance the connection strength between the end cap 11 and the housing 10, thereby enhancing the structural strength of the battery cell 102.

[0216] In some embodiments, the protective member 15 is made of an insulating material.

[0217] Exemplarily, the protective member 15 can be made of insulating materials such as polypropylene, polyethylene, and polybutene.

[0218] Thus, when the protective member 15 contacts the electrode tab, it does not affect the insulation between the electrode tabs, which helps to improve the insulation effect of the electrode assembly 12 relative to the housing 10.

[0219] In some embodiments, as Figure 15 shown, on one side of the protruding portion 112 along the second direction Z facing the electrode assembly 12, there is a receiving cavity 112a communicating with the accommodating space, and at least the electrode tab 124 electrically connected to the first electrode terminal 13 is received in the receiving cavity 112a.

[0220] The convex portion 112 is formed by protruding away from the accommodation space. The side of the convex portion 112 close to the accommodation space has a storage cavity 112a, and the storage cavity 112a 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 entire tab 124 can be received in the storage cavity 112a, or a part of the tab 124 can be received in the storage cavity 112a, and the other part of the tab 124 is received in the accommodation space.

[0221] Thus, by receiving the tab 124 electrically connected to the first electrode terminal 13 in the storage cavity 112a of the convex portion 112, it helps to make the main body portion 111 closer to the electrode assembly 12 relative to the convex portion 112, thereby helping to reduce the overall volume of the battery cell 102 and helping to improve the volume utilization rate within the battery cell 102.

[0222] In some embodiments, the battery cell 102 includes a first electrode terminal 13 and a second electrode terminal 14. The end cap 11 has a first convex portion and a second convex portion. The first convex portion has a first storage cavity, and the second convex portion has a second storage cavity. A part of the first electrode terminal 13 is located in the first storage cavity, and a part of the second electrode terminal 14 is located in the second storage cavity.

[0223] The first convex portion and the second convex portion are arranged on the end cap 11 at intervals. The first electrode terminal 13 is provided on the first convex portion, and the second electrode terminal 14 is provided on the second convex 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 convex portion and is electrically connected to the first tab 124 and is received in the first storage cavity. A part of the second electrode terminal 14 passes through the second convex portion and is electrically connected to the second tab 124 and is received in the second storage cavity.

[0224] Since the first electrode terminal 13 is provided on the first convex portion and a part of the first electrode terminal 13 is located in the first storage cavity, and the second electrode terminal 14 is provided on the second convex portion and a part of the second electrode terminal 14 is located in the second storage cavity, therefore, the two electrode terminals are respectively received in the relatively independent storage cavities 112a, which can not only reduce the risk of conduction between the first electrode terminal 13 and the second electrode terminal 14, but also help to make the main body portion 111 closer to the electrode assembly 12 relative to the convex portion 112, thereby helping to reduce the overall volume of the battery cell 102 and helping to improve the volume utilization rate within the battery cell 102.

[0225] In a second aspect, an embodiment of the present application further provides a battery 100, including a box body 101 and at least two battery cells 102 as described above.

[0226] The battery cells 102 are arranged in the box body 101 at least along the first direction X and are connected in series or in parallel with each other.

[0227] Since the battery includes the battery cell 102 with strong structural strength, the battery has strong usage reliability.

[0228] In some embodiments, such as Figure 2 and Figure 17 shown, each battery cell 102 is arranged along the first direction X. Among 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 bus bar.

[0229] Thus, the electrical connection between adjacent battery cells 102 is achieved by setting the bus bar.

[0230] In some embodiments, such as Figure 17 shown, at least one box wall of the box body 101 has a boss 1011. The boss 1011 is formed by the box wall bulging towards the direction away from the battery cell 102. The boss 1011 forms a receiving portion on the side facing the battery cell 102. Along the direction perpendicular to the box wall where the boss 1011 is formed, the projection of the convex portion 112 does not exceed the projection of the boss 1011, and at least part of the convex portion 112 is received in the receiving portion.

[0231] Thus, by receiving the convex portion 112 in the receiving portion of the boss 1011, it helps to reduce the overall volume of the box body 101 and improve the volume utilization rate inside the box body 101.

[0232] In a third aspect, an embodiment of the present application further provides an electrical device, including 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 electrical device.

[0233] Thus, the electrical device has strong usage reliability. Moreover, the space reserved for the battery or the battery cell 102 in the electrical device can be reduced, or the overall energy of the battery can be increased while keeping the space unchanged, which helps to improve the layout freedom of the battery and its surrounding structures in the electrical device and improve the endurance / standby ability of the electrical device.

[0234] In a fourth aspect, an embodiment of the present application further provides an energy storage device, including the battery cell 102 as described above, or the battery 100 as described above. The battery cell 102 or the battery is used to store electrical energy and can supply electrical energy.

[0235] Thus, the energy storage device has strong usage reliability. And the space reserved for the battery in the energy storage device can be reduced, or the overall energy of the battery can be increased while keeping the space unchanged, which helps to reduce the space occupied by the energy storage device or increase the energy storage capacity.

[0236] A specific embodiment of the present application will be described below.

[0237] The end cap 11 and the housing 10 are connected by welding. The top (end face 121) of the bare battery cell (electrode assembly 12) is attached with a blue film (protective member 15), and the separator is enclosed on the surface of the bare battery cell, so that the separator is isolated from the connection position between the end cap 11 and the housing 10.

[0238] The insulating sheet (first insulating member 16) of the bare battery cell (electrode assembly 12) is close to the welding area, which will also have a certain adverse effect on the welding. A notch is provided at the position of the first insulating member 16 facing the main body portion 111, so that there is a gap between the first insulating member 16 and the connection position of the end cap 11 and the housing 10, avoiding the first insulating member 16 extending between the welding areas of the end cap 11 and the housing 10 and reducing the influence on the welding.

[0239] A lower plastic (second insulating member 18) is provided between the end cap 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 columns (first electrode terminal 13 and second electrode terminal 14) are provided.

[0240] The blue film (protective member 15) is provided at least near the edge of the bare battery cell (electrode assembly 12), and only the lower plastic (second insulating member 18) may be provided in the middle of the two side edges.

[0241] The main body portion 111 and the end face 121 are relatively close, the height of the lower plastic (second insulating member 18) is reduced, and it is difficult to fix the first insulating member 16 to the lower plastic (second insulating member 18). The bonding sheet 17 is provided to bond the first insulating member 16 to the electrode assembly 12 or the protective member 15, so that the first insulating member 16 is fixed.

[0242] A plurality of first through holes 151 are provided in 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 in the range of 10% to 50%.

[0243] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: A housing having a receiving space and an opening; an electrode assembly, accommodated in the accommodation space, the electrode assembly comprising at least a pole piece and a diaphragm stacked along a first direction, the electrode assembly having an end surface on a side close to the opening along a second direction, and the electrode assembly having first side surfaces opposite to each other along the first direction; an end cap, the end cap covering the opening, the end cap comprising a main body and a raised portion connected to the main body, and the raised portion protrudes toward a side away from the electrode assembly along the second direction; A first electrode terminal, disposed on the protruding portion and electrically connected to the electrode assembly; 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 protective member at least partially overlaps with the orthographic projection of the main body, The first direction is perpendicular to the second direction.

2. The battery cell according to claim 1, characterized in that: The protection member covers a portion of the end surface and extends to the two first side surfaces.

3. The battery cell according to claim 1 or 2, characterized in that: The end cover is provided with two protrusions, and the two protrusions are arranged at intervals along the third direction. The battery cell further includes a second electrode terminal, wherein the first electrode terminal is disposed on one of the protrusions and is electrically connected to the electrode assembly, and the second electrode terminal is disposed on the other protrusion and is electrically connected to the electrode assembly. Along the second direction, the electrical connection between the first electrode terminal and the electrode assembly does not overlap with the projection of the protective member on the same projection plane, and the electrical connection between the second electrode terminal and the electrode assembly does not overlap with the projection of the protective member on the same projection plane. The first direction, the second direction and the third direction are perpendicular to each other.

4. The battery cell according to claim 3, characterized in that: Along the second direction, projections of the main body and the protection member on the same projection plane overlap, and projections of the protrusion and the protection member on the same projection plane do not overlap.

5. The battery cell according to any one of claims 1 to 4, characterized in that: The battery cell further includes a first insulating member disposed between the housing and the electrode assembly. Along the second direction, the first insulating member does not extend beyond the end surface.

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

7. The battery cell according to claim 5 or 6, characterized in that: The first insulating member is bonded to the protective member via an adhesive sheet, the adhesive sheet is laminated and covers the first insulating member from a side away from the electrode assembly, and a portion of the adhesive sheet that does not overlap with the covered first insulating member is bonded to the protective member.

8. The battery cell according to claim 7, characterized in that: The first insulating member comprises a sheet-shaped insulating member, Along a direction perpendicular to the first insulating member, in the same projection plane, the projection of the first insulating member is located within the projection of the adhesive sheet.

9. The battery cell according to claim 6, characterized in that: A first adhesive layer is provided on the surface of the first insulating member facing the electrode assembly, a portion of the first insulating member is bonded to the electrode assembly through the first adhesive layer, and another portion of the first insulating member is bonded to the protective member through the first adhesive layer.

10. The battery cell according to any one of claims 1 to 9, characterized in that: The battery cell further includes a second insulating member, which is disposed between the end cover and the electrode assembly. Along the second direction, the second insulating member abuts against the protective member from a side away from the electrode assembly.

11. The battery cell according to claim 10, characterized in that: Along the first direction, the second insulating member does not extend beyond the protecting member.

12. The battery cell according to any one of claims 1 to 9, characterized in that: The end cover is provided with a liquid injection hole, and a guide channel connected to the liquid injection hole is provided between the end cover and the electrode assembly. The part of the protective member arranged on the end surface is provided with a first through hole connected to the guide channel.

13. The battery cell according to claim 12, characterized in that: The battery cell further includes a second insulating member, which is disposed between the end cover and the electrode assembly. Along the second direction, the second insulating member abuts against the protective member from a side away from the electrode assembly. A first groove is provided on a side of the second insulating member facing the protective member. The first groove is open toward the side of the protective member, and the first groove forms at least a portion of the guide channel.

14. The battery cell according to claim 12, characterized in that: The battery cell further includes a second insulating member, which is disposed between the end cover and the electrode assembly. Along the second direction, the second insulating member abuts against the protective member from a side away from the electrode assembly. The second insulating member is provided with a second groove on one side facing the end cover, the second groove is open on one side facing the end cover, the second groove forms at least part of the guide channel, the second groove is provided with a second through hole, and the guide channel is connected with the first through hole through the second through hole.

15. The battery cell according to any one of claims 12 to 14, characterized in that: There are a plurality of first through holes, and the first through holes are arranged along the third direction. The first direction, the second direction and the third direction are perpendicular to each other.

16. The battery cell according to any one of claims 12 to 15, characterized in that: Along the second direction, in the same projection plane, the total area of ​​projections of all the first through holes accounts for 10% to 50% of the area of ​​the projection of the electrode assembly.

17. The battery cell according to claim 16, characterized in that: The equivalent diameter of each of the first through holes is less than or equal to 15 mm.

18. The battery cell according to any one of claims 1 to 17, characterized in that: A portion of the end cover is bent along the second direction to form a convex portion, A portion of the end cover extends into the shell and is connected to the inner circumferential surface of the shell, and an edge of the end cover abuts against an end edge of the shell in the second direction and is connected to each other.

19. The battery cell according to any one of claims 1 to 18, characterized in that: A side of the protection member facing the electrode assembly has a second adhesive layer.

20. The battery cell according to any one of claims 1 to 19, characterized in that: The protection member is made of insulating material.

21. The battery cell according to any one of claims 1 to 20, characterized in that: A receiving cavity communicating with the receiving space is provided on one side of the protrusion along the second direction toward the electrode assembly. The electrode tab electrically connected to the first electrode terminal is at least accommodated in the receiving cavity.

22. The battery cell according to claim 21, characterized in that: The battery cell includes a first electrode terminal and a second electrode terminal, The end cover has a first protrusion and a second protrusion, the first protrusion has a first receiving cavity, and the second protrusion 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, characterized in that: The invention comprises a casing and at least two battery cells according to any one of claims 1 to 22.

24. The battery according to claim 23, characterized in that The battery cells are arranged along the first direction. Among the adjacent battery cells, the first electrode terminal of one of the battery cells is electrically connected to the first electrode terminal of another of the battery cells through a bus bar.

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

26. An electrical device, characterized in that: The electrical device comprises 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, and the battery cells or the battery provide power for the electrical device.

27. An energy storage device, characterized in that: The energy storage device comprises 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, wherein the battery cells or the battery are used to store electrical energy and can provide electrical energy.

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