Battery and battery arrangement

Abstract

Battery cell, characterized in that it comprises: a housing having an opening portion; an end cap blocking the opening portion, the end cap being connected to the housing to form a receiving space, the end cap comprising an end cap body and a first insulating member, the first insulating member being arranged on the side of the end cap body toward the receiving space; an electrode assembly disposed in the receiving space, the electrode assembly comprising an electrode body and a first tab; a support member disposed between the electrode body and the first insulating member, the support member comprising a support portion and a support portion, the support portion projecting relative to the support portion toward the electrode body to form a first convex portion and a first concave portion opposite to each other; wherein an electrolyte injection hole is arranged on the end cap and the projection of the electrolyte injection hole and the projection of the first concave portion at least partially overlap in the thickness direction of the end cap, and the first convex portion is further provided with a first through hole that enables communication between the first concave portion and the receiving space.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery cell and a battery arrangement. BACKGROUND

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles have become an important part of the sustainable development of the automotive industry due to their advantages of energy conservation and environmental protection. Battery technology is a key factor in the development of electric vehicles.

[0003] The electrolyte injection process is an important step in battery manufacturing. Therefore, improving electrolyte injection efficiency and effectiveness is a technical problem that currently needs to be solved. SUMMARY OF THE UTILITY MODEL

[0004] The present application provides a battery cell and a battery assembly that improves the electrolyte injection efficiency and the electrolyte injection effect of the battery cell.

[0005] To solve the above problem, the present application contains the following essential technical solutions: An embodiment of the present application provides a battery cell including a housing, an end cap, an electrode assembly, and a support member; the housing includes an opening portion blocked by the end cap, the end cap is connected to the housing to form a receiving space, the end cap includes an end cap body and a first insulating member, and the first insulating member is arranged on the side of the end cap body toward the receiving space; the electrode assembly is arranged in the receiving space, and the electrode assembly includes an electrode body and a first tab;The support member is arranged between the electrode body and the first insulating member. The support member includes a support portion and a support portion, and the support portion protrudes relative to the support portion toward the electrode body to form a first convex portion and a first concave portion that oppose each other. An electrolyte injection hole is arranged on the end cap, and the projection of the electrolyte injection hole and the projection of the first concave portion at least partially overlap in a thickness direction of the end cap. The first convex portion is further provided with a first through-hole that enables communication between the first concave portion and the receiving space.

[0006] In the battery cell according to the embodiment of the present application, the support member located between the electrode body and the first insulating member supports the electrode body, the first insulating member forms an insulating partition between the support member and the end cap, and the support portion supports the first insulating member, so that the edge and the center of the support member support the first support member and the electrode body, respectively. With this arrangement, the outer side of the first convex portion of the support member can perform the function of supporting the electrode body, and the first concave portion can perform the function of receiving the first tab on the electrode body. Through the electrolyte injection hole, the electrolyte can be easily injected into the receiving space from one side of the end cap.Furthermore, the projection of the electrolyte injection hole in the thickness direction of the end cap partially overlaps with the projection of the first concave portion in the thickness direction of the end cap, allowing a portion of the electrolyte in the electrolyte injection hole to directly fall into the first concave portion, thereby buffering a portion of the electrolyte in the electrolyte injection hole. Furthermore, it facilitates the rapid accumulation of the electrolyte in the first concave portion, allowing the electrolyte in the first concave portion to flow out of the first through-hole more quickly, thereby realizing rapid electrolyte injection for the accommodation space.

[0007] According to a second aspect, an embodiment of the present application provides a battery assembly including a plurality of battery cells as described in any of the above embodiments.

[0008] The end cap is located below a corresponding housing, the electrode body includes a first end surface toward the end cap, and the ratio of the area of ​​the first through-hole to the area of ​​the first end surface is greater than or equal to 0.002 and less than or equal to 0.09. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] To more clearly illustrate the embodiments of the present application or the technical solution in the prior art, the drawings required for describing the specific embodiments or the prior art are briefly presented below. It is understood that the drawings described below represent some embodiments of the present application. Those skilled in the art may obtain other drawings based on these drawings without any creative effort. Fig. 1 is a schematic diagram of the structure of a battery cell according to some embodiments of the present application; Fig. 2 is a schematic diagram of the structure of a battery cell according to some embodiments of the present application; Fig. 3 is a schematic diagram of the structure of a battery cell according to some embodiments of the present application; Fig. 4 is a schematic diagram of the structure of a battery cell according to some embodiments of the present application. In the figures: 1: Housing; 101: Opening section; 2: End cap; 201: Receiving space; 202: End cap body; 203: First insulating element; 204: Electrolyte injection hole; 205: Second insulating element; 3: Electrode assembly; 301: Electrode body; 302: First tab; 3011: First end face; 4: Support element; 401: Support section; 402: Supporting section; 4011: First convex section; 4012: First concave section; 4013: First through hole; 4015: First sub-through hole; 4018: floor wall, 4019: perimeter wall; X: First direction. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0010] In order to clarify the subject matter, technical solution, and advantages of the embodiments of the present application, the technical solution according to the embodiments of the present application will be described clearly and completely in conjunction with the drawings of the present application. Obviously, the described embodiments are a part of the embodiments of the present application and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of the present application.

[0011] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. The terms used in the description of this application are for the purpose of describing particular embodiments only and are not intended to be limiting of this application. The terms "include", "comprising", and "having" in the description and claims of this application as well as in the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc.in the application text and claims of the present application or the above-mentioned drawings are used to distinguish different objects rather than to describe a specific order or primary and secondary relationship.

[0012] Reference to an "embodiment" in this application means that the specific features, structures, or characteristics described in connection with the embodiment may be included in at least one embodiment of this application. The term used in various places throughout the application text does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. Those skilled in the art expressly and implicitly understand that the embodiments described in this application may be combined with other embodiments.

[0013] In the description of the present application, it should be noted that the terms "installation," "interconnection," "connection," and "fixing" are to be understood in a broad sense, unless expressly stated and limited otherwise. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a direct connection or an indirect connection through an intermediate medium, or it may be the internal connection of two elements. Those skilled in the art will recognize the specific meanings of the above terms in the present application according to the specific circumstances.

[0014] The term "and / or" in this application merely describes the association relationship of the associated objects and indicates that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the symbol " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0015] As used in this application, the term "a plurality of" / "a plurality of" refers to more than two (including two). Similarly, the term "a plurality of groups" / "a plurality of groups" refers to more than two groups (including two groups), and the term "a plurality of sheets" / "a plurality of sheets" refers to more than two sheets (including two sheets).

[0016] As an example, a battery cell includes a cell formed by a positive electrode and a negative electrode as electrochemical material carriers, a separator for separating the positive electrode and the negative electrode to prevent short circuits, an electrolyte as an ion transport carrier, a casing to achieve structural protection, and a terminal to achieve connection with an external circuit.

[0017] As an example, the cell includes at least one of a prismatic cell with a steel casing or an aluminum casing, a cell with a plastic casing, a pouch cell, or a cylindrical cell.

[0018] In some embodiments, a prismatic aluminum-case battery includes an end cap, and a positive terminal pin and a negative terminal pin may be arranged on an end surface of the end cap in the thickness direction. A prismatic aluminum case is connected to the bottom of the end cap, and the edge of the prismatic aluminum cases is fixed to the edge of the end cap, and together they enclose and form a receiving space. A positive electrode and a negative electrode are arranged in the receiving space, and a separator paper is arranged between the positive electrode and the negative electrode, wherein the main material of the separator paper includes polyethylene.

[0019] In some embodiments, the separator paper is also referred to as Mylar film, and the separator paper includes at least one or more layers of thin film. If the separator paper includes a multi-layer composite film, the materials of each layer may be the same or different.

[0020] In some embodiments, the battery cell includes a separator component but does not include separator paper, and the separator component includes a solid electrolyte disposed between the positive electrode and the negative electrode. The solid electrolyte transfers ions between the positive electrode and the negative electrode and insulates the positive electrode and the negative electrode.

[0021] In some embodiments, a sealing ring is arranged in the prismatic aluminum housing battery, located between the prismatic aluminum housing and the end cap. The sealing ring is configured to achieve a seal between the prismatic aluminum housing and the end cap.

[0022] In some embodiments, an insulating blue foil is applied to the outside of the prismatic aluminum housing, which is designed to provide insulation protection for the prismatic aluminum housing and to improve the reliability of the prismatic aluminum housing battery.

[0023] In some embodiments, the active ions in the electrolyte include lithium ions, and the active ions move back and forth between the positive electrode and the negative electrode.

[0024] In some embodiments, the positive electrode includes a positive current collector and a positive active material disposed on at least one surface of the positive current collector. In this arrangement, the positive current collector has two surfaces perpendicular to its thickness direction, and the positive active material is disposed on at least one of the two opposite surfaces of the positive current collector.

[0025] In some embodiments, the positive current collector includes a metal foil or a composite current collector. When the positive current collector is a metal foil, it includes at least one of aluminum with silver plating on the surface, stainless steel, stainless steel with silver plating on the surface, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium. When the positive current collector includes a composite current collector, the positive current collector includes a polymer material layer and a metal layer arranged sequentially. The polymer material layer includes substrates including, but not limited to, polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, and polyethylene, and the metal layer includes metal materials including, but not limited to, aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy.

[0026] In some embodiments, the negative electrode includes one of a metal foil and a negative current collector. When the negative electrode includes a metal foil, the metal foil includes, but is not limited to, aluminum with surface silver plating, stainless steel with surface silver plating, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium. When the negative electrode includes a negative current collector, the negative current collector includes two surfaces perpendicular to its thickness direction, and at least one of the two surfaces is provided with a negative active material.

[0027] For example, the negative active material includes at least one of artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based material, tin-based material, and lithium titanate. The silicon-based material includes at least one of elemental silicon, silicon oxide compound, silicon-carbon compound, silicon-nitrogen compound, and silicon alloy. The tin-based material includes at least one of elemental tin, tin oxide compound, and tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as negative active materials for batteries can also be used. These negative active materials can be used alone or in a combination of two or more.

[0028] If the cell includes a cylindrical cell, in some embodiments, the cylindrical cell includes a cap, a housing, and a bottom spacer arranged sequentially. A sealing ring is arranged between the cap and the housing, and the sealing ring fills the gap between the cap and the housing. The cap, the housing, and the bottom spacer enclose and form a receiving space, and a bare cell in a wound form is arranged in the receiving space. The bare cell includes a cathode electrode, an anode electrode, and a separator paper.

[0029] The end surface of the lower spacer facing away from the receiving space in the vertical thickness direction is provided with a negative tab, and the outer housing is the negative terminal.

[0030] The end face of the cap facing away from the receiving space in the vertical thickness direction is provided with a positive terminal, and the end face of the cap closest to the receiving space in the vertical thickness direction is provided with a positive tab. The positive tab is located at the first end face of the positive electrode, and the first end face is the end face perpendicular to the overlapping surfaces of multiple positive electrodes.

[0031] In some embodiments, the cell includes a pouch cell, and a plurality of overlapping positive electrodes, negative electrodes, and separator paper are arranged within the pouch cell. The pouch cell is surrounded by an aluminum-plastic packaging film and an insulating film to form a receiving space, and an electrolyte is arranged within the receiving space.

[0032] In some embodiments, the battery cells are connected in series and parallel, fixed by an external frame, connected to a battery management module for signal detection and a thermal cooling management system to form a battery module.

[0033] In one example, the battery module includes a bottom plate for a bottom guard, an end plate for an end guard, a side plate for a side guard, and a cap plate for a top guard.

[0034] For the sake of simplicity, an embodiment of the present application will be described by taking a vehicle as an example of an electrical device.

[0035] The vehicle includes a fuel vehicle, a gas vehicle, or a new energy vehicle, where the new energy vehicle includes, but is not limited to, a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle. A battery is located at the bottom, front end, or rear of the vehicle. The battery supplies power to the vehicle. As the vehicle's operating power source, the battery supplies power to the vehicle's circuitry, including meeting the vehicle's required operating power during startup, navigation, and operation.

[0036] The vehicle further includes a control unit and a motor, and the controller is configured to control the battery to supply power to the motor, including meeting the required operating power of the vehicle during starting, navigation, and driving.

[0037] In some embodiments of the present application, the battery may be used not only as the operating power source of the vehicle, but also as the motive power source of the vehicle, replacing or partially replacing fuel or natural gas to provide motive power for the vehicle.

[0038] The battery includes a box and a battery cell housed in the box. The box can take on various structures. In some embodiments, the box includes a first sub-box and a second sub-box, wherein the first sub-box and the second sub-box are combined to form a box, and the first sub-box and the second sub-box together define a receiving space for receiving the battery cell. The second sub-box includes a prismatic structural element with an opening on one side, the first sub-box includes a prismatic structural element with an opening on one side, and the openings of the first sub-box and the second sub-box are combined accordingly, such that the first sub-box and the second sub-box together define the receiving space.The first sub-box includes a plate-shaped structural element, and the first sub-box covers the opening side of the second sub-box.

[0039] The battery may contain a plurality of battery cells, and the plurality of battery cells may be connected in series, parallel, or mixed. Mixed connection means that both series and parallel connections are present among the plurality of battery cells. The plurality of battery cells may be directly connected in series, parallel, or mixed connection, and then the whole formed by the plurality of battery cells is housed in the case. Of course, the battery may also be a battery module formed by connecting a plurality of battery cells in series, parallel, or mixed connection, and then connecting a plurality of these battery modules in series, parallel, or mixed connection to form a whole housed in the case. The battery may also have other structures.For example, the battery may further include a busbar component for implementing an electrical connection between the plurality of battery cells.

[0040] In the present embodiment, the battery cell includes at least one of a secondary battery and a primary battery. The battery cell includes, but is not limited to, a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery.

[0041] The development of battery technology involves many design factors, including performance parameters such as energy density and discharge energy. Furthermore, batteries must be clamped, moved, or transported during battery manufacturing, testing, and debugging. In this case, the electrode assembly within the battery inevitably moves with the movement of the battery. The electrode assembly includes electrodes, separator paper, and tabs. When the battery is vibrated, vibrations of the electrode assembly occur, resulting in relative vibrations or collisions between the separator paper and the electrodes within the electrode assembly. Furthermore, when the battery is turned over, the tabs inevitably collide with the cap plate. Therefore, a support member for the electrode assembly is provided to protect the electrodes and the tabs.The support element protects the tabs between the cap plate and the electrodes and reduces or even prevents vibrations of the electrode assembly.

[0042] The support element is connected to the electrode assembly, and both are located together in the receiving space formed by the cap plate and the housing in the battery. Since the support element must also protect the tab, the support element is located between the electrode assembly and the cap plate. Based on this, the support element blocks the end surface of the electrode assembly where the tab is located, so that the projection of the support element in the thickness direction of the cap plate partially overlaps the projection of the electrode assembly in the thickness direction of the cap plate.During the battery's electrolyte injection process, the support member located between the electrode assembly and the cap plate blocks the material to be injected, reducing the battery's electrolyte injection efficiency. This is especially true because the first end face is difficult to impregnate and can only be impregnated after the electrolyte injection is complete, thus impairing the efficiency of electrolyte injection. The first end face may be the end face of the electrode assembly toward the cap plate.

[0043] In view of this, the embodiment of the present application provides a battery cell to improve the electrolyte injection efficiency of the battery. As in Fig. 1, the battery cell includes a housing 1, an end cap 2, an electrode assembly 3 and a support element 4.

[0044] The housing 1 may be a conductive element or an insulating element, and the housing 1 may provide structural protection for the electrode assembly 3. The housing 1 has an opening portion 101.

[0045] The end cap 2 blocks the opening portion, and the end cap 2 is connected to the housing 1 to define a receiving space 201, which accommodates the electrode assembly 3 and the electrolyte. During electrolyte injection, the electrolyte enters the receiving space 201 from the outer area of ​​the end cap 2 and gradually fills the receiving space 201, so that the electrode assembly 3 within the receiving space 201 is impregnated with the electrolyte.

[0046] The end cap 2 includes an end cap body 202 and a first insulating member 203. The first insulating member 203 is designed to provide insulation separation between the electrode assembly 3 and the end cap 2. During the electrolyte injection process, the first insulating member 203 does not affect the injection process, thereby improving the insulation reliability of the electrolyte injection process.

[0047] The first insulating element 203 is arranged on the side of the end cap body 202 facing the receiving space 201. During electrolyte injection, the electrolyte flows from the end cap 2 to the first insulating element 203 and then, after flowing through the first insulating element 203, flows to the support element 4.

[0048] The electrode assembly 3 is arranged in the receiving space 201, and the electrode assembly 3 includes an electrode body 301 and a first tab 302. The material in the electrolyte injection process not only impregnates the first tab 302 but also impregnates the electrode body 301.

[0049] It should be noted that the first tab 302 may be a positive tab or a negative tab, which is not limited in the present application.

[0050] As an example, the electrode assembly 3 is formed by stacking or winding a positive electrode, a negative electrode, and a separator. The separator is placed between the positive electrode and the negative electrode. The separator has an insulating function. The positive electrode and the negative electrode realize ionic conduction through the electrolyte.

[0051] The support member 4 is disposed between the electrode body 301 and the first insulating member 203. The electrode assembly 3 is supported by the support member 4 to prevent the tab from being compressed when the battery is turned over and to reduce the likelihood of the electrode assembly 3 falling off during shocks.

[0052] The support element 4 includes a support section 401 and a support section 402. Reference should be made to the Fig. 2 and Fig. 3. The support portion 401 protrudes relative to the support portion 402 toward the electrode body 301 to form a first convex portion 4011 and a first concave portion 4012 that oppose each other. When electrolyte injection is performed, the first concave portion 4012 can buffer and accumulate the material to be injected, thereby reducing the problem of the electrolyte directly impacting the electrode assembly 3 during the electrolyte injection process.

[0053] The first through-hole 4013 is disposed in the first convex portion 4011, and the electrolyte discharged from the first through-hole 4013 can flow along the surface of the first convex portion 4011, so that the first convex portion 4011 can also exert secondary buffering on the material to be injected. As a result, the material to be injected does not directly fall onto the electrode assembly 3, and the material to be injected is guided by the first convex portion 4011, thus improving the efficiency of electrolyte injection. Note that the first concave portion 4012 can also achieve a certain degree of material guiding effect during electrolyte injection.

[0054] The end cap 2 is provided with an electrolyte injection hole 204. In the thickness direction of the end cap 2, the projection of the electrolyte injection hole 204 at least partially overlaps with the projection of the first concave portion 4012. The electrolyte injection of the battery can be realized through the electrolyte injection hole 204. Since the projections of the electrolyte injection hole 204 and the first concave portion 4012 at least partially overlap in the thickness direction of the end cap 2, the material in the electrolyte injection that flows out of the electrolyte injection hole 204 flows into the first concave portion 4012 in proportion to the overlap area of ​​the projections, so that the injected material accumulates in the first concave portion 4012 and thus does not directly impinge on the electrode assembly 3.The first concave portion 4012 is designed to realize the accumulation of materials during the electrolyte injection process, thereby improving the electrolyte injection effect during the electrolyte injection process.

[0055] The first convex portion 4011 is further provided with a first through-hole 4013, which allows the first concave portion 4012 to communicate with the receiving space 201. The first through-hole 4013 is designed to release the material injected into the first concave portion 4012. When the material flows into the first concave portion 4012 during the electrolyte injection process, the first through-hole 4013 releases the material accumulated in the first concave portion 4012 to the electrode assembly 3, thereby improving the impregnation efficiency of the electrode assembly 3 and the electrolyte injection efficiency of the battery.

[0056] By providing the first through-hole 4013 at the edge of the first convex portion 4011, the material in the first concave portion 4012 can be quickly discharged to the electrode assembly 3, thereby improving the impregnation efficiency of the electrode assembly 3, so that the electrode assembly 3 can be quickly impregnated.

[0057] In the battery cell according to the embodiment of the present application, the support member 4 is located between the electrode body 301 and the first insulating member 203, and the first insulating member 203 forms an insulation separation between the support member 4 and the end cap body 202. The support portion 402 supports the first insulating member 203, and the support portion 401 is configured to support the electrode body 301, so that the edge and the center of the support member 4 support the first insulating member 203 and the electrode body 301, respectively.

[0058] The first convex portion 4011 of the support member 401 may perform the function of supporting the electrode body 301, and the first concave portion 4012 may perform the function of receiving the first tab 302 on the electrode body 301. Through the electrolyte injection hole 204, the material can be easily injected into the receiving space 201 from one side of the end cap 2, and the projection of the electrolyte injection hole 204 in the thickness direction of the end cap 2 partially overlaps with the projection of the first concave portion 4012 in the thickness direction of the end cap 2, so that part of the material in the electrolyte injection hole 204 first falls into the first concave portion 4012. As a result, part of the material flowing through the electrolyte injection hole 204 can be buffered, the direct impact of the injected material on the electrode assembly 3 can be reduced, and the electrolyte injection effect can be improved.

[0059] In other embodiments, Fig. 2, the electrode body 301 has a first end surface 3011 in the direction of the end cap 2, the area of ​​the first end surface 3011 being greater than or equal to 2000 mm 2 and less than or equal to 10000 mm 2 the area of ​​the first through hole 4013 is greater than or equal to 20 mm 2 and less than or equal to 200 mm 2and the ratio of the area of ​​the first through-hole 4013 to the area of ​​the first end face 3011 is greater than or equal to 0.002 and less than or equal to 0.1. When the electrolyte injection is performed, the electrolyte enters from the electrolyte injection hole 204, passes through the first insulating member 203 and the supporting member 4 in sequence, and then flows to the first end face 3011. In this case, the electrolyte may start to impregnate the electrode assembly 3 from the first end face 3011, and then the electrolyte impregnates downward along the electrode assembly 3, thereby improving the impregnation efficiency.

[0060] It is understood that the larger the ratio of the first through-hole 4013 to the first end surface 3011, the faster the electrolyte in the first concave portion 4012 can flow to the first end surface 3011. The smaller the ratio of the first through-hole 4013 to the first end surface 3011, the smaller the influence of the first through-hole 4013 on the strength of the support member 4, thereby ensuring that the support member 4 has sufficient strength to achieve the supporting effect.

[0061] In the above embodiment, under the above relationship, the time for the electrolyte flowing through the first through-hole 4013 to impregnate the first end face 3011 is further shortened, so that the electrolyte flowing through the first through-hole 4013 can impregnate the first end face 3011 in a shorter time. Therefore, the impregnation time of the first end face 3011 does not change with its own area or the diameter of the first through-hole 4013, which can improve the impregnation efficiency of the first end face 3011 of the electrode body 301 toward the end cap 2.

[0062] Optionally, the area of ​​the first end surface 3011 2000 mm 2 , 3000 mm 2 , 4000 mm 2 , 5000 mm 2 , 6000 mm 2 , 7000 mm 2 , 8000 mm 2 , 9000 mm 2 , 10000 mm 2It is understood that the above values ​​are only examples for the present application and that, as long as they fall within the above range, they are within the scope of the present application.

[0063] Optionally, the area of ​​the first through hole 4013 20 mm 2 , 40 mm 2 , 60 mm 2 , 80 mm 2 , 100 mm 2 , 120 mm 2 , 140 mm 2 , 160 mm 2 , 180 mm 2 , 200 mm 2 It is understood that the above values ​​are only examples for the present application and that, as long as they fall within the above range, they are within the scope of the present application.

[0064] Optionally, the area ratio can be 0.002, 0.012, 0.022, 0.032, 0.042, 0.052, 0.062, 0.072, 0.082, 0.092, or 0.1. It is understood that the above values ​​are only examples for the present application, and that as long as they fall within the above range, they are within the scope of the present application.

[0065] In other embodiments, the present solution further provides that the projection of the electrolyte injection hole 204 in the thickness direction of the end cap 2 does not overlap with the projection of the first through-hole 4013.

[0066] Therefore, when electrolyte injection is performed, the electrolyte, after flowing out of the electrolyte injection hole 204 under the action of gravity, does not immediately fall into the first through-hole 4013, but first falls onto the inner wall of the first concave portion 4012 and then flows through the first through-hole 4013. Thus, the probability that the electrolyte leaking from the electrolyte injection hole 204 directly impacts the electrode assembly 3 is reduced, so that the electrolyte is first buffered by the inner wall of the first concave portion 4012, thereby ensuring the injection reliability of the battery during the electrolyte injection process.

[0067] In the above embodiment, the electrolyte flowing out of the electrolyte injection hole 204 first flows to the support member part 4, so that the support member 4 can buffer the electrolyte flowing out of the electrolyte injection hole 204 before the electrolyte then enters the first through-hole 4013. This reduces the probability that the electrolyte from the electrolyte injection hole 204 directly impacts the electrode assembly 3.

[0068] In other embodiments, the present solution further provides that in the thickness direction of the end cap 2, the electrolyte injection hole 204 has a first projection 2041, the first through-hole 4013 has a second projection and in a first direction “X” the minimum distance between the first projection 2041 and the second projection is greater than or equal to 4 mm and less than or equal to 40 mm, and the first direction “X” is perpendicular to the thickness direction of the end cap 2.

[0069] The distance between the first projection 2041 and the second projection is the horizontal distance between the electrolyte injection hole 204 and the first through-hole 4013. By limiting the above minimum distance, the electrolyte flowing out of the electrolyte injection hole 204 enters the first through-hole 4013 after a horizontal displacement, thereby achieving buffering of the electrolyte in the electrolyte injection hole 204 to the first through-hole 4013.

[0070] In the above embodiment, at the minimum distance, the entry of the electrolyte flowing out of the electrolyte injection hole 204 into the first through-hole 4013 can be delayed, so that there is a horizontal displacement between the electrolyte flowing out of the electrolyte injection hole 204 and the electrolyte in the first through-hole 4013.

[0071] Optionally, the minimum distance can be 4 mm, 14 mm, 24 mm, 34 mm, or 40 mm. It is understood that the above values ​​are only examples for the present application, and that as long as they fall within the above range, they are within the scope of the present application.

[0072] On the one hand, this can ensure that the electrolyte in the first concave portion 4012 can be discharged relatively quickly from the first through-hole 4013 to ensure the impregnation speed of the electrode assembly 3; on the other hand, the electrolyte in the first concave portion 4012 can have sufficient time to buffer to reduce the impact energy of the electrolyte and further reduce the direct impact force of the electrolyte on the electrode assembly 3.

[0073] In other embodiments, the present solution further provides that the first through-hole 4013 includes a plurality of first sub-through-holes 4015 arranged at intervals, and in the thickness direction of the end cap 2, the projection of the electrolyte injection hole 204 does not overlap with the projection of a first through-hole 4013. After the electrolyte flows through the electrolyte injection hole 204 to the first concave portion 4012, it is discharged through a plurality of first sub-through-holes 4015 to impregnate the electrode assembly 3. In this case, the electrolyte first flows into the first concave portion 4012 and then sequentially flows out of the near first sub-through-hole 4015 and the far first sub-through-hole 4015.In the thickness direction of the end cap 2, the distance between the projection of the electrolyte injection hole 204 and the projection of any two sub-via-holes 4015, after comparing any two distances, the first sub-via-hole 4015 corresponding to the smaller distance is the near first sub-via-hole 4015, and the first sub-via-hole 4015 corresponding to the larger distance is the far first sub-via-hole 4015.

[0074] In the above embodiment, the electrode assembly 3 is simultaneously impregnated in multiple directions through the plurality of first sub-through holes 4015, and the electrolyte flowing out of the electrolyte injection hole 204 does not directly enter any first sub-through hole 4015, so that the electrolyte can be quickly injected into the receiving space 201 while reducing the impact of the electrolyte on the electrode assembly 3.

[0075] After the electrolyte in the electrolyte injection hole 204 falls into the first concave portion 4012, the impact point of the electrolyte in the first concave portion 4012 may be located between the plurality of first sub-through-holes 4015, and then it may flow to each first sub-through-hole 4015. The electrolyte simultaneously passes through the plurality of first sub-through-holes 4015 to impregnate the electrode assembly 3, so that the electrode assembly 3 is supplied with electrolyte at different locations, thereby achieving multi-location impregnation and improving the impregnation efficiency.

[0076] In other embodiments, the present system further provides that, in the thickness direction of the end cap 2, the projections of the plurality of first sub-through holes 4015 include a third projection and a fourth projection, and in the first direction "X," the third projection and the fourth projection are located on both sides of the projection of the electrolyte injection hole 204, and the first direction "X" is perpendicular to the thickness direction of the end cap 2. After the electrolyte in the electrolyte injection hole 204 flows into the first concave portion 4012, the electrolyte can flow to the first sub-through hole 4015 corresponding to the third projection and to the first sub-through hole 4015 corresponding to the fourth projection, respectively, so that the electrolyte can flow to the first sub-through holes 4015 in different directions and different paths.

[0077] When the third projection and the fourth projection are each at the same distance from the projection of the electrolyte injection hole 204, the electrolyte in the electrolyte injection hole 204 can simultaneously flow out of the first sub-through-hole 4015 corresponding to the third projection and the fourth projection. In this case, the electrode assembly 3 can simultaneously receive electrolyte injection from the first sub-through-hole 4015 in two different directions. When the third projection and the fourth projection are each at different distances from the projection of the electrolyte injection hole 204, the electrolyte in the electrolyte injection hole 204 can sequentially flow out of the first sub-through-hole 4015 corresponding to the third projection and the fourth projection.In this case, the electrode assembly 3 may be sequentially impregnated with the electrolyte discharged from the first sub-through-hole 4015 corresponding to the third projection and the fourth projection.

[0078] When the third projection and the fourth projection are located on both sides of the projection of the electrolyte injection hole 204, the first sub-through-hole 4015 corresponding to the third projection and the fourth projection is located on both sides of the electrolyte injection hole 204. In this case, when the electrolyte flows out of the electrolyte injection hole 204, the electrolyte can enter the first sub-through-hole 4015 corresponding to the third projection and the fourth projection after flowing to both sides, thereby ensuring that the electrode assembly 3 can be impregnated with electrolyte from different directions, thereby improving the electrolyte injection efficiency and the impregnation effect.

[0079] In other embodiments, the present system further provides that the first through-hole 4013 is a long stripe hole, and the dimension of the first through-hole 4013 in the longitudinal direction of the end cap 2 is larger than the dimension of the first through-hole 4013 in the width direction of the end cap 2. When the electrolyte flows to the first through-hole 4013, the electrolyte flows out along the long stripe hole. Since the dimension of the first through-hole 4013 in the longitudinal direction of the end cap 2 is larger than the dimension of the first through-hole 4013 in the width direction of the end cap 2, the length and width of the long stripe hole correspond to the length and width of the end cap 2, respectively.In this case, when the electrolyte flows out from the long side of the long strip hole, the long side of the end cap 2 corresponding to the electrode assembly 3 can be impregnated, and when the electrolyte flows out from the short side of the long strip hole, the short side of the end cap 2 corresponding to the electrode assembly 3 can be impregnated.

[0080] That is, the long first stripe through-hole 4013 is formed according to the shape of the electrode assembly 3 so that the electrode assembly 3 can be impregnated with maximum efficiency, thereby improving the overall impregnation effect on the electrode assembly 3.

[0081] In the above embodiment, when the long first stripe through-hole 4013 allows the electrolyte to flow out of the first through-hole 4013, the electrolyte injection can be performed more quickly in the longitudinal direction of the end cap 2, so that the electrolyte injection efficiency in the longitudinal direction of the end cap 2 is greater than the electrolyte injection efficiency in the width direction of the end cap 2. Since the longitudinal direction of the electrode assembly 3 is consistent with the longitudinal direction of the end cap 2, the long side of the electrode assembly 3 can be impregnated more quickly, thereby reducing the situation that the wide side of the electrode assembly 3 is already impregnated, but the long side of the electrode assembly 3 has not been impregnated or has been impregnated to a small extent. This improves the overall impregnation efficiency and the impregnation effect on the electrode assembly 3.

[0082] In other embodiments, as in Fig.4, the present system further provides that the first convex portion 4011 includes a bottom wall 4018 and a peripheral wall 4019. In the thickness direction of the end cap 2, the bottom wall 4018 abuts the electrode body 301. One end of the peripheral wall 4019 is connected to the outer peripheral edge of the bottom wall 4018, and the other end of the peripheral wall 4019 is connected to the support portion 402.

[0083] That is, the bottom wall 4018 and the peripheral wall 4019 enclose and form a first concave portion 4012 for temporarily accommodating the electrolyte, and the electrolyte flows out of the electrolyte injection hole 204 and enters the first concave portion 4012. The electrode body 301 is supported by the bottom wall 4018, and the bottom wall 4018 is supported by the peripheral wall 4019 of the support portion 402.

[0084] In the above embodiment, the bottom wall 4018 of the first convex portion 4011 abuts against the electrode body 301, and the peripheral wall 4019 is connected between the bottom wall 4018 and the support portion 402, and the peripheral wall 4019 supports the bottom wall 4018 and the support portion 402 on the side of the bottom wall 4018. The peripheral wall 4019 can guide the electrolyte to the bottom wall 4018 to improve the electrolyte injection efficiency.

[0085] In other embodiments, the present system further provides that the first through-hole 4013 is arranged on the bottom wall 4018. In this way, the electrolyte can flow directly from the first through-hole 4013 on the bottom wall 4018. Since the bottom wall 4018 also supports the electrode body 301, the electrolyte can flow directly from the first through-hole 4013 of the bottom wall 4018 to the electrode body 301, thereby preventing the electrolyte from directly impacting the electrode assembly 3 and also improving the speed and efficiency of the electrolyte flowing out of the first through-hole 4013. In this way, the electrode assembly 3 is impregnated, and the impregnation efficiency and impregnation effect are improved.

[0086] In the above embodiment, when the electrolyte flows out of the first through-hole 4013, it can flow directly to the electrode body 301, which improves the impregnation efficiency and the impregnation effect and enables the rapid impregnation of the electrode body 301 and the corresponding side of the support member 4.

[0087] In other embodiments, the present system further provides that the first through-hole 4013 is disposed on the peripheral wall 4019. In this way, the electrolyte can be impregnated through the first through-hole 4013 only when its height reaches the first through-hole 4013 on the peripheral wall 4019. In this case, the electrolyte flows out of the first through-hole 4013 located on the peripheral wall 4019 after a certain amount of electrolyte is stored in the first concave portion 4012, thereby further enhancing the buffering effect of the support portion 401.

[0088] Furthermore, in the above embodiment, the electrolyte can be drained from the first through-hole 4013 during the injection process and guided along the peripheral wall 4019 to the electrode assembly 3. The process of the electrolyte flowing along the peripheral wall 4019 is also another buffering process. That is, when the electrolyte flows out of the first through-hole 4013, it can be blocked by the peripheral wall 4019 side to create a buffer.

[0089] In other embodiments, the present system further provides that the minimum distance "A" between the first through-hole 4013 and the bottom wall 4018 in the thickness direction of the end cap 2 satisfies 0≤A≤5 mm. Optionally, the minimum distance between the first through-hole 4013 and the bottom wall 4018 may be 0.1 mm, 2 mm, 3 mm, 4 mm, 5 mm. It is understood that the above values ​​are only examples for the present application, and that as long as they fall within the above range, they are within the scope of the present application.

[0090] After the electrolyte flows to the bottom wall 4018, it accumulates in the first concave portion 4012. After the electrolyte flows out from the first through-hole 4013, it can impregnate the electrode assembly 3. Since the minimum distance between the first through-hole 4013 and the bottom wall 4018 in the thickness direction of the end cap 2 is within the above range, on the one hand, it can ensure that the support portion 401 can store a certain amount of electrolyte and ensure the buffer capacity of the support portion 401 for the electrolyte, and on the other hand, the impregnation speed of the electrode assembly 3 is not significantly adversely affected due to the excess electrolyte stored in the first concave portion 4012.

[0091] In the above embodiment, after accumulating a certain amount on the bottom wall 4018, the electrolyte flows out of the first through-hole 4013, and the time until the electrolyte remains on the bottom wall 4018 for buffering is shortened, thereby improving the electrolyte injection efficiency.

[0092] In other embodiments, the scheme further provides that, in the first direction "X," the inner edge of the cross section of the peripheral wall 4019 is inclined in the first direction "X" relative to the inner side surface of the bottom wall 4018, wherein the first direction "X" is perpendicular to the thickness direction of the end cap 2. The inclined peripheral wall 4019 allows the electrolyte in the first concave portion 4012 to be discharged more quickly from the first through-hole 4013, thereby improving the impregnation efficiency of the electrolyte with respect to the electrode assembly 3. In addition, when the inclined peripheral wall 4019 is opposite the electrolyte injection hole 204 in the thickness direction of the end cap 2, the electrolyte can be better buffered and the impact energy of the electrolyte can be reduced.

[0093] In the above embodiment, after the electrolyte is discharged from the first through-hole 4013, the inclined peripheral wall 4019 further performs an inclined deflection function for the electrolyte, so that the electrolyte flows more slowly along the peripheral wall 4019 to the electrode assembly 3, thereby better buffering the electrolyte and improving the impregnation effect on the electrode assembly 3.

[0094] In other embodiments, the present system further provides that in the first direction "X", the angle between the inner edge of the cross-section of the peripheral wall 4019 in the first direction "X" and the inner side surface of the bottom wall 4018 is θ θ, where 91°≤θ≤179°.

[0095] Since the angle between the inner edge of the cross-section of the peripheral wall 4019 in the first direction "X" and the inner side surface of the bottom wall 4018 corresponds to the above range, the inclined peripheral wall 4019 allows the electrolyte in the first concave portion 4012 to be discharged more quickly from the first through-hole 4013, thereby improving the impregnation efficiency of the electrolyte into the electrode assembly 3. In addition, when the inclined peripheral wall 4019 is opposite to the electrolyte injection hole 204 in the thickness direction of the end cap 2, the electrolyte can be better buffered and the impact energy of the electrolyte can be reduced.

[0096] Optionally, the angle θ between the inner edge of the cross-section of the peripheral wall 4019 in the first direction "X" and the inner side surface of the bottom wall 4018 can be 91°, 101°, 111°, 121°, 131°, 141°, 151°, 161°, 171°, 179°. It should be understood that the above values ​​are only examples for the present application, and as long as they fall within the above range, they are within the scope of the present application.

[0097] On the one hand, the inclined peripheral wall 4019 can further enhance the buffering effect on the electrolyte, and on the other hand, the peripheral wall 4019 is not so inclined that it impairs the supporting function of the supporting element 4.

[0098] In other embodiments, the present system further provides that the electrode body 301 has a first end surface 3011 toward the end cap 2, and the ratio of the area of ​​the first through-hole 4013 to the area of ​​the first end surface 3011 is greater than or equal to 0.003 and less than or equal to 0.1.

[0099] As the electrolyte flows through the first through-hole 4013, it is influenced by the area of ​​the first through-hole 4013, which in turn determines the injection rate of the electrolyte. By adjusting the area ratio, the electrolyte flowing through the first through-hole 4013 can quickly impregnate the electrode assembly 3 while simultaneously ensuring the buffering effect of the support member 4 on the electrolyte.

[0100] Optionally, the ratio of the area of ​​the first through-hole 4013 to the area of ​​the first end surface 3011 may be 0.003, 0.013, 0.023, 0.033, 0.043, 0.053, 0.063, 0.073, 0.083, 0.093, 0.1. It should be understood that the above values ​​are only examples for the present application, and as long as they fall within the above range, they are within the scope of the present application.

[0101] In the above embodiment, when the ratio of the area of ​​the first through-hole 4013 to the area of ​​the first end face 3011 is 0.003 or 0.1, the electrolyte flows out of the first through-hole 4013 more quickly and impregnates the first end face 3011 more quickly, thereby improving the electrolyte injection efficiency and ensuring the buffering effect of the support member 4 on the electrolyte.

[0102] In other embodiments, the present system further provides that the projection of the first tab 302 in the thickness direction of the end cap 2 at least partially overlaps the projection of the electrolyte injection hole 204. After the electrolyte flows from the electrolyte injection hole 204, it may first impinge on the first tab 302, and the first tab 302 may have a buffering effect on a portion of the electrolyte and then enter the first concave portion 4012. And by partially overlapping the projection of the first tab 302 with the projection of the electrolyte injection hole 204, the first tab 302 is fully received in the first concave portion 4012.

[0103] In the above embodiment, a part of the electrolyte flowing out of the electrolyte injection hole 204 is blocked by the first tab 302, that is, a part of the electrolyte flowing out of the electrolyte injection hole 204 can directly fall into the first concave portion 4012, and the other part is buffered by a tab and flows along the first tab 302 to the first concave portion 4012.

[0104] In other embodiments, the present system further provides that at least one side of the first tab 302 is provided with a second insulating element 205 in the thickness direction, and one end of the second insulating element 205 extends beyond the end of the first tab 302 on the same side in the width direction of the first tab 302.

[0105] The second insulating member 205 insulates and separates the first tab 302 in the width direction of the first tab 302. In addition, since at least a part of the first tab 302 is covered with the second insulating member 205, the second insulating member 205 acts as a buffer during the bending process of the first tab 302, thereby reducing the likelihood of breakage due to excessive bending of the first tab 302.

[0106] In other embodiments, the present system further provides that the area of ​​the electrolyte injection hole 204 is greater than or equal to 2 mm 2 and less than or equal to 20 mm 2and the ratio of the area of ​​the first through-hole 4013 to the area of ​​the first end surface 3011 is greater than or equal to 0.004 and less than or equal to 0.1. The electrolyte injection efficiency of the electrolyte injection hole 204 is affected by the ratio of the first through-hole 4013 to the first end surface 3011. Since the ratio of the area of ​​the first through-hole 4013 to the area of ​​the first end surface 3011 corresponds to the above range, on the one hand, the electrolyte injection efficiency is ensured during the electrolyte injection process and the electrode assembly 3 can be impregnated at a more appropriate speed. On the other hand, this can also ensure that the support member 4 can buffer the electrolyte and reduce the probability of the electrolyte directly impacting the electrode assembly 3.

[0107] In the above embodiment, by limiting the area of ​​the electrolyte injection hole 204, the electrolyte injection speed of the electrolyte injection hole 204 can be accelerated, so that the optimal electrolyte injection rate is maintained when the area of ​​the first through-hole 4013 and the first end surface 3011 changes. Also, the degree of coordination between the inflow rate of the electrolyte, the electrode body 301, and the first through-hole 4013 can be improved.

[0108] Optionally, the area of ​​the electrolyte injection hole 204 2 mm 2 , 4 mm 2 , 6 mm 2 , 8 mm 2 , 10 mm 2 , 14 mm 2 , 16 mm 2 , 18 mm 2 , 20 mm 2 It is understood that the above values ​​are only examples for the present application and that, as long as they fall within the above range, they are within the scope of the present application.

[0109] Optionally, the ratio of the area of ​​the first through-hole 4013 to the area of ​​the first end surface 3011 may be 0.004, 0.014, 0.024, 0.034, 0.044, 0.054, 0.064, 0.074, 0.084, 0.094, 0.1. It should be understood that the above values ​​are only examples for the present application, and as long as they fall within the above range, they are within the scope of the present application.

[0110] In other embodiments, the present system further provides that an electrode body 301 is provided, and the ratio of the area of ​​the first through-hole 4013 to the area of ​​the first end face 3011 is greater than or equal to 0.001 and less than or equal to 0.05. After the electrolyte flows through the first through-hole 4013, the first end face 3011 is impregnated in proportion to the area ratio, thereby improving the impregnation efficiency and impregnation effect of the first end face 3011.

[0111] In the above embodiment, the electrolyte injection efficiency and electrolyte injection effect of the battery cell including an electrode body 301 are improved. It is ensured that both the electrolyte injection speed and the electrolyte injection effect can be improved.

[0112] Optionally, the ratio of the area of ​​the first through-hole 4013 to the sum of the areas of the plurality of first end surfaces 3011 may be 0.001, 0.011, 0.021, 0.031, 0.041, 0.05. It should be understood that the above values ​​are only examples for the present application, and that as long as they fall within the above range, they are within the scope of the present application.

[0113] The present invention further provides another embodiment in which a plurality of electrode bodies 301 are arranged, and the ratio of the area of ​​the first through-hole 4013 to the sum of the areas of a plurality of first end surfaces 3011 is greater than or equal to 0.001 and less than or equal to 0.05. After the electrolyte flows through the first through-hole 4013, it can impregnate the plurality of electrode bodies 301. Since the ratio of the area of ​​the first through-hole 4013 to the sum of the areas of the plurality of first end surfaces 3011 is within the above range, the electrolyte injection efficiency increases with the increase in the number of electrode bodies 301, ensuring that even a plurality of electrode assemblies 3 can be efficiently impregnated.

[0114] In the above embodiment, the electrolyte injection efficiency is improved when a plurality of electrode bodies 301 are provided, and the electrolyte injection efficiency and the impregnation effect can be improved without being limited to the number of electrode bodies 301.

[0115] Optionally, in this case, the ratio of the area of ​​the first through-hole 4013 to the sum of the areas of the plurality of first end surfaces 3011 may be 0.001, 0.011, 0.021, 0.031, 0.041, 0.05. It should be understood that the above values ​​are only examples for the present application, and as long as they fall within the above range, they are within the scope of the present application.

[0116] The present invention further provides another embodiment in which the electrode assembly 3 is a wound electrode assembly 3, and the ratio of the area of ​​the first through-hole 4013 to the area of ​​the first end face 3011 is greater than or equal to 0.003 and less than or equal to 0.09. The electrolyte can simultaneously impregnate the shielded parts of the anode, cathode, and connected separator of the wound electrode, and can simultaneously impregnate multiple parts of any one anode, cathode, or separator, thereby improving the electrolyte injection efficiency of the wound electrode assembly 3. With this area ratio, the impregnation efficiency of any one anode, cathode, or separator in the first end face 3011 of the wound electrode assembly 3 is improved.

[0117] In the above embodiment, the electrode assembly 3 includes a wound electrode assembly 3, and the electrolyte entering the accommodation space 201 through the electrolyte injection hole 204 first flows to the first end surface 3011 corresponding to the anode, cathode, and the associated separator in the wound electrode assembly 3. The ratio of the area of ​​the first through-hole 4013 to the first end surface 3011 can improve the impregnation efficiency of the anode, cathode, and the associated separator, improve the injection efficiency of the wound electrode assembly 3, and also ensure the impregnation effect of the electrode assembly 3.

[0118] Optionally, in this case, the ratio of the area of ​​the first through-hole 4013 to the area of ​​the first end surface 3011 may be as follows: 0.003, 0.013, 0.023, 0.033, 0.043, 0.053, 0.063, 0.073, 0.083, 0.09. It should be understood that the above values ​​are only examples for the present application, and as long as they fall within the above range, they are within the scope of the present application.

[0119] The present invention further provides another embodiment in which the electrode assembly 3 is a stacked electrode assembly 3, and the ratio of the area of ​​the first through-hole 4013 to the area of ​​the first end face 3011 is greater than or equal to 0.004 and less than or equal to 0.1. The electrolyte simultaneously impregnates the multilayered positive electrode, negative electrode, and separator paper of the stacked electrode assembly 3, ensuring that the shielded parts of each layer of the structure can be quickly impregnated, thereby improving the impregnation efficiency of the stacked electrode assembly 3. With this ratio, the first end face 3011 corresponding to the stacked electrode assembly 3 can be impregnated more quickly, and the impregnation effect of the electrode assembly 3 can also be ensured.

[0120] In the above embodiment, the electrode assembly 3 includes a stacked electrode assembly 3. The electrolyte, after entering the receiving space 201 through the electrolyte injection hole 204, first flows to the first end surface 3011 corresponding to the tab of the stacked electrode assembly 3, which improves the impregnation efficiency of the electrode body 301 by the ratio of the area of ​​the first through-hole 4013 and the first end surface 3011, thereby improving the electrolyte injection efficiency of the stacked electrode assembly 3.

[0121] Optionally, in this case, the ratio of the area of ​​the first through-hole 4013 to the area of ​​the first end surface 3011 may be 0.004, 0.014, 0.024, 0.034, 0.044, 0.054, 0.064, 0.074, 0.084, 0.094, 0.1. It should be understood that the above values ​​are only examples for the present application, and as long as they fall within the above range, they are within the scope of the present application.

[0122] The present invention further provides another embodiment in which a battery cell is provided, the battery cell including an end cap 2, the end cap 2 being connected to a housing 1, and the end cap 2 and the housing 1 together enclosing and forming a receiving space 201. The end cap 2 includes an end cap body 202 and a first insulating member 203, which are arranged sequentially toward the interior of the receiving space 201.

[0123] An electrode assembly 3 is arranged in the receiving space 201, and a support member 4 is arranged between the electrode assembly 3 and the first insulating member 203. A tab receiving portion is arranged on the side of the support member 4 near the first insulating member 203, and the projection of the tab receiving portion in the thickness direction of the end cap 2 at least partially overlaps with the electrolyte injection hole 204. A first concave portion 4012 is arranged in the center of the support member 4, and the first concave portion 4012 includes a bottom wall 4018 and a peripheral wall 4019. The first concave portion 4012 and the first insulating member 203 enclose and form the tab receiving portion. The peripheral wall 4019 is provided with a first through-hole 4013, and the area ratio of the first through-hole 4013 to the end surface of the electrode assembly 3 near the end cap 2 is greater than or equal to 0.002 and less than or equal to 0.09.

[0124] There are at least two first through-holes 4013, and the projections of a plurality of first through-holes 4013 in the thickness direction of the end cap 2 do not overlap with the electrolyte injection hole 204 on the end cap 2, and the electrolyte injection hole 204 is located between the projections of the plurality of first through-holes 4013. The positional distance between the projection of the first through-hole 4013 in the thickness direction of the end cap 2 and the electrolyte injection hole 204 on the end cap 2 is greater than or equal to 4 mm and less than or equal to 40 mm.

[0125] The dimension of the first through hole 4013 in the longitudinal direction of the end cap 2 is larger than its dimension in the width direction of the end cap 2.

[0126] The bottom wall 4018 abuts the electrode assembly 3, and the peripheral wall 4019 is located on both sides of the electrode assembly 3. In the thickness direction of the end cap 2, the minimum distance between the first through-hole 4013 and the bottom wall 4018 is "A", where 0≤A≤5 mm. In the first direction "X", the inner edge of the cross section of the peripheral wall 4019 is inclined in the first direction "X" relative to the inner side surface of the bottom wall 4018, and the first direction "X" is perpendicular to the thickness direction of the end cap 2. In the first direction "X", the angle between the inner edge of the cross section of the peripheral wall 4019 in the first direction "X" and the inner side surface of the bottom wall 4018 is θ, where 91°≤θ≤179°.

[0127] The electrode assembly 3 includes a first tab 302 located in the tab receiving area. In the thickness direction of the end cap 2, the projection of the first tab 302 at least partially overlaps the projection of the electrolyte injection hole 204.

[0128] The first tab 302 is provided with a second insulating member 205 on at least one side in the thickness direction, and in the width direction of the first tab 302, one end of the second insulating member 205 extends beyond the end of the first tab 302 on the same side. The surface of the first tab 302 is coated with an insulating rubber layer, and the width of the rubber layer extends beyond the width of the first tab 302.

[0129] The area of ​​the electrolyte injection hole 204 is greater than or equal to 2 mm 2 and less than or equal to 20 mm 2, and the ratio of the area of ​​the first through-hole 4013 to the area of ​​the first end surface 3011 is greater than or equal to 0.004 and less than or equal to 0.1.

[0130] There are a plurality of electrode assemblies 3, and the range of the ratio of the end area of ​​the electrode assembly 3 near the end cap 2 to the opening area of ​​the first through-hole 4013 is greater than or equal to 0.001 and less than or equal to 0.05.

[0131] In other embodiments, the present application discloses a battery assembly including a plurality of battery cells as described in any of the above embodiments, wherein the end cap is located below the corresponding housing, the electrode body includes a first end surface toward the end cap, and the ratio of the area of ​​the first through-hole to the area of ​​the first end surface is greater than or equal to 0.002 and less than or equal to 0.09.

[0132] It should also be noted that the terms "include," "comprise," or any other variations are intended to cover a non-exclusive inclusion, such that a process, method, commodity, or device that includes a set of elements may include not only those elements, but also other elements not expressly listed, or may also include elements inherent in such a process, method, commodity, or device. Unless further limitations apply, the elements defined by the phrase "include a..." do not exclude the presence of other identical elements in the process, method, commodity, or device that include the elements.

[0133] The various embodiments in this specification are described in sequential order, where identical and similar parts may be referenced between the various embodiments, and each embodiment focuses on the differences from other embodiments. In particular, the description for one embodiment of the system is relatively simple because it is substantially similar to the embodiment of the method, where the relevant parts may be referenced to the partial description of the embodiment of the method.

[0134] The above description is only one embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modification, equivalent substitution, improvement, etc., made within the spirit and principle of the present application are intended to be included within the scope of the claims of the present application.

[0135] Although the embodiments of the present application are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, all such modifications and variations being within the scope of the appended claims.

Claims

[1] Battery cell, characterized by that it includes: a housing having an opening portion; an end cap blocking the opening portion, the end cap being connected to the housing to form a receiving space, the end cap comprising an end cap body and a first insulating member, the first insulating member being arranged on the side of the end cap body toward the receiving space; an electrode assembly disposed in the receiving space, the electrode assembly comprising an electrode body and a first tab; a support member disposed between the electrode body and the first insulating member, the support member comprising a support portion and a support portion, the support portion projecting relative to the support portion toward the electrode body to form a first convex portion and a first concave portion opposite to each other; wherein an electrolyte injection hole is arranged on the end cap and the projection of the electrolyte injection hole and the projection of the first concave portion at least partially overlap in the thickness direction of the end cap, and the first convex portion is further provided with a first through hole that enables communication between the first concave portion and the receiving space. [2] Battery cell according to claim 1, characterized bythat the electrode body comprises a first end face in the direction of the end cap and the ratio of the area of ​​the first through-hole to the area of ​​the first end face is greater than or equal to 0.002 and less than or equal to 0.

1. [3] Battery cell according to claim 1 or 2, characterized by that in the thickness direction of the end cap the projection of the electrolyte injection hole does not overlap with the projection of the first through-hole. [4] Battery cell according to claim 3, characterized by in that in the thickness direction of the end cap, the electrolyte injection hole has a first projection, the first through-hole has a second projection and in a first direction the minimum distance between the first projection and the second projection is greater than or equal to 4 mm and less than or equal to 40 mm, wherein the first direction is perpendicular to the thickness direction of the end cap. [5] Battery cell according to claim 3, characterized bythat the first through-hole comprises a plurality of first sub-through-holes arranged at intervals, and in the thickness direction of the end cap, the projection of the electrolyte injection hole does not overlap with the projection of any of the first through-holes. [6] Battery cell according to claim 5, characterized by in that in the thickness direction of the end cap, the projections of the plurality of first sub-through holes include a third projection and a fourth projection, and in the first direction, the third projection and the fourth projection are located on both sides of the projection of the electrolyte injection hole, the first direction being perpendicular to the thickness direction of the end cap. [7] Battery cell according to one of the preceding claims, characterized bythat the first through-hole is a long strip hole and the dimension of the first through-hole in the longitudinal direction of the end cap is larger than the dimension of the first through-hole in the width direction of the end cap. [8] Battery cell according to one of the preceding claims, characterized by that the first convex portion comprises a bottom wall and a peripheral wall, and in the thickness direction of the end cap, the bottom wall abuts the electrode body, one end of the peripheral wall is connected to the outer peripheral edge of the bottom wall, and the other end of the peripheral wall is connected to the support portion. [9] Battery cell according to claim 8, characterized by that the first through hole is located on the bottom wall. [10] Battery cell according to claim 8, characterized by that the first through hole is arranged on the peripheral wall. [11] Battery cell according to claim 10, characterized bythat in the thickness direction of the end cap the minimum distance between the first through hole and the bottom wall is "A", where 0≤A≤5 mm. [12] Battery cell according to claim 10, characterized by that in the first direction the inner edge of the cross section of the peripheral wall is inclined in the first direction relative to the inner side surface of the bottom wall, the first direction being perpendicular to the thickness direction of the end cap. [13] Battery cell according to claim 12, characterized by that in the first direction, the angle between the inner edge of the cross-section of the peripheral wall in the first direction and the inner side surface of the bottom wall is θ, where 91°≤θ≤179°. [14] Battery cell according to claim 10, characterized by that the electrode body comprises a first end face in the direction of the end cap and the ratio of the area of ​​the first through-hole to the area of ​​the first end face is greater than or equal to 0.003 and less than or equal to 0.

1. [15] Battery cell according to one of the preceding claims, characterized by that the projection of the first tab and the projection of the electrolyte injection hole at least partially overlap in the thickness direction of the end cap. [16] Battery cell according to one of the preceding claims, characterized by that the first tab is provided with a second insulating element on at least one side in the thickness direction and that one end of the second insulating element extends beyond the end of the first tab on the same side in the width direction of the first tab. [17] Battery cell according to one of the preceding claims, characterized by that the area of ​​the electrolyte injection hole is greater than or equal to 2 mm 2 and less than or equal to 20mm 2 and the ratio of the area of ​​the first through-hole to the area of ​​the first end surface is greater than or equal to 0.004 and less than or equal to 0.

1. [18] Battery cell according to one of the preceding claims, characterized by that an electrode body is arranged and the ratio of the area of ​​the first through-hole to the area of ​​the first end surface is greater than or equal to 0.001 and less than or equal to 0.

05. [19] Battery cell according to one of the preceding claims, characterized by that a plurality of electrode bodies are arranged and the ratio of the area of ​​the first through-hole to the sum of the areas of the plurality of first end surfaces is greater than or equal to 0.001 and less than or equal to 0.

05. [20] Battery cell according to one of the preceding claims, characterized by that the electrode assembly is a wound electrode assembly and the ratio of the area of ​​the first through-hole to the area of ​​the first end surface is greater than or equal to 0.003 and less than or equal to 0.

09. [21] Battery cell according to one of the preceding claims, characterized bythat the electrode assembly is a stacked electrode assembly and the ratio of the area of ​​the first through-hole to the area of ​​the first end surface is greater than or equal to 0.004 and less than or equal to 0.

1. [22] Battery arrangement, characterized by in that it comprises a plurality of battery cells according to one of claims 1 to 21, the end cap is located under the corresponding housing, the electrode body has a first end surface towards the end cap, and the ratio of the area of ​​the first through-hole to the area of ​​the first end surface is greater than or equal to 0.002 and less than or equal to 0.09.

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