Single battery and battery pack
By installing a liquid-blocking device at the liquid injection hole of the individual battery, the problem of repeatedly inserting and removing pins to block the liquid injection hole during the production process is solved, thereby reducing costs and improving liquid injection efficiency, and preventing moisture from entering the battery cell.
Patent Information
- Application Number
- CN202520242753.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-14
- Publication Date
- 2026-01-30
- Estimated Expiration
- 2035-02-14
AI Technical Summary
In existing technologies, the production process of single-cell batteries requires repeated insertion and removal of pins to seal the liquid injection holes, which leads to increased production line length and increased cost of the pins, and makes it difficult to effectively prevent moisture from the air from entering the cell.
A liquid-blocking component is installed at the liquid injection hole of a single cell, including a connecting part and a blocking part. By partially blocking the liquid injection hole with the liquid-blocking component, combined with the elastic design and the channel structure, the liquid injection hole can be effectively sealed and opened to prevent water from entering. At the same time, the blocking area of the liquid injection hole is reduced during liquid injection to facilitate liquid injection.
It simplifies the production process, saves the need for inserting and removing pins, reduces costs, and effectively prevents moisture from entering the electrode assembly, thereby improving the efficiency of liquid injection and battery production.
Smart Images
Figure CN223858249U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of single battery, and in particular to a single battery and a battery pack. BACKGROUND
[0002] As the core component and energy source of electric vehicles, power batteries are the focus of current research. In the subsequent production of power batteries, in order to prevent moisture in the air from entering the inside of the battery cell, it is necessary to plug and unplug the nails to block the liquid injection hole in multiple processes such as primary liquid injection, formation and secondary liquid injection. For the process of single battery production, the nails need to be repeatedly plugged and unplugged, which not only lengthens the length of the production line, but also brings a large amount of nail cost. CONTENT OF THE UTILITY MODEL
[0003] Therefore, the purpose of the present application is to overcome the deficiencies in the prior art and provide a single battery and a battery pack.
[0004] In a first aspect, the present application provides a single battery, the single battery has a height direction, and the single battery comprises:
[0005] A shell is provided with an accommodation cavity inside the shell;
[0006] An electrode assembly is arranged in the accommodation cavity;
[0007] A top cover is connected to the shell to cover the accommodation cavity along the height direction, a boss is arranged on one side of the top cover close to the electrode assembly, the boss protrudes in the direction close to the electrode assembly along the height direction, and a liquid injection hole is arranged in the boss along the height direction;
[0008] An insulating piece is arranged in the accommodation cavity, the insulating piece is arranged on one side of the top cover facing the electrode assembly, a liquid passing hole is arranged in the insulating piece along the height direction, the boss is located in the liquid passing hole, and the liquid passing hole is in communication with the liquid injection hole;
[0009] A liquid blocking piece is arranged on one side of the insulating piece close to the electrode assembly, the liquid blocking piece is an elastic liquid blocking piece, part of the liquid blocking piece abuts against the boss along the height direction, a projection of part of the liquid blocking piece along the height direction is located in the liquid passing hole, and part of the liquid blocking piece along the height direction blocks the liquid injection hole.
[0010] In some embodiments, the liquid blocking piece comprises a connecting portion and a blocking portion connected to each other, the connecting portion is connected to the insulating piece, the blocking portion abuts against the boss along the height direction, a projection of the blocking portion along the height direction is located in the liquid passing hole, and the blocking portion blocks the liquid injection hole along the height direction.
[0011] In some embodiments, the monomer battery has a length direction intersecting with the height direction, the shielding part is provided with a gap part, the gap part penetrates the shielding part along the height direction, the gap part communicates the liquid injection hole and the accommodating cavity, and the gap part partially extends along the length direction.
[0012] In some embodiments, the gap part includes a first strip-shaped channel extending along the length direction, and an end of the first strip-shaped channel away from the connecting part penetrates an edge of the shielding part along the length direction.
[0013] In some embodiments, the monomer battery has a width direction intersecting with both the height direction and the length direction; the gap part further includes a second strip-shaped channel extending along the width direction, and the second strip-shaped channel communicates with the first strip-shaped channel.
[0014] In some embodiments, the second strip-shaped channel communicates with the first strip-shaped channel at a center along the length direction, the first strip-shaped channel and the second strip-shaped channel cross-communicate, the first strip-shaped channel separates the second strip-shaped channel into two flow channels, and the two flow channels are symmetrically arranged along the length direction.
[0015] In some embodiments, the second strip-shaped channel communicates with the first strip-shaped channel at an end along the length direction, the second strip-shaped channel is close to the connecting part, and an end of the first strip-shaped channel away from the connecting part penetrates an edge of the shielding part along the length direction.
[0016] In some embodiments, the second strip-shaped channel communicates with the first strip-shaped channel at an end along the length direction; the second strip-shaped channel is away from the connecting part, and the second strip-shaped channel is away from an edge of the shielding part away from the connecting part.
[0017] In some embodiments, the liquid blocking member is made of insulating material.
[0018] In a second aspect, the application provides a battery pack comprising the monomer battery.
[0019] Embodiments of the application have the following advantages: by adding the liquid blocking member at the liquid injection hole, the projection of at least part of the liquid blocking member along the height direction covers the liquid injection hole, so as to block the external air and moisture from entering the electrode assembly; in addition, the liquid blocking member can move into the accommodating cavity during liquid injection, so as to reduce the overlapping area between the liquid blocking member along the height direction and the liquid injection hole, so as to facilitate the liquid injection into the electrode assembly, not only meeting the production requirements of liquid injection and formation processes, but also saving the action of plugging and unplugging the nail, simplifying the process, and reducing the cost.
[0020] In order to make the above objects, features and advantages of the present application more apparent and easy to understand, the following preferred embodiments are specifically described below with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS
[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be considered as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.
[0022] Figure 1 A structure diagram of a single battery from one perspective is shown, which is provided by some embodiments of the present application;
[0023] Figure 2 An exploded view of a single battery is shown, which is provided by some embodiments of the present application;
[0024] Figure 3 A structure diagram of a top cover and an insulating part from one perspective in a single battery is shown, which is provided by some embodiments of the present application;
[0025] Figure 4 A sectional view of the A-A part in the single battery is shown; Figure 3
[0026] Figure 5 An enlarged view of the B part in the single battery is shown; Figure 4
[0027] An exploded view of the top cover and the insulating part in the single battery is shown, which is provided by some embodiments of the present application; Figure 6
[0028] A sectional view of the top cover and the insulating part from one perspective in the single battery is shown, which is provided by some embodiments of the present application; Figure 7
[0029] A structure diagram of a liquid blocking part from one perspective in a single battery is shown, which is provided by some embodiments of the present application; Figure 8
[0030] A structure diagram of a liquid blocking part from one perspective in a single battery is shown, which is provided by some embodiments of the present application; Figure 9
[0031] A structure diagram of a liquid blocking part from one perspective in a single battery is shown, which is provided by some embodiments of the present application; Figure 10
[0032] Figure 11 A structure schematic view of one perspective of a fourth implementation of the liquid blocking piece in the single battery is shown according to some embodiments of the utility model.
[0033] Main element symbol explanation:
[0034] 100 - shell; 110 - containing cavity; 200 - electrode assembly; 300 - top cover; 310 - boss; 311 - liquid injection hole; 400 - insulation piece; 410 - liquid passing hole; 500 - liquid blocking piece; 510 - connecting part; 520 - shielding part; 521 - gap part; 5211 - first strip-shaped hole; 5212 - second strip-shaped hole.
[0035] X - length direction; Y - width direction; Z - height direction. DETAILED DESCRIPTION
[0036] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only, and are used to explain the present application, and cannot be understood as a limitation of the present application.
[0037] It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical", "horizontal", "left", "right", and similar expressions used herein are used for illustrative purposes only.
[0038] In the present application, unless specifically defined otherwise and limited, the terms "mount", "connect", "connection", "fixed", and similar terms are to be broadly understood, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0039] In addition, the terms "first", "second", etc. are used only for descriptive purposes and should not be construed as implying or suggesting relative importance or an indicated number of technical features. Thus, features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.
[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the template herein is only for the purpose of describing specific embodiments and is not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more of the associated listed items.
[0041] During the manufacturing process of the single battery, it is generally necessary to inject electrolyte, charge and discharge the single battery, activate the active material, and make the single battery charged to the extent of normal use.
[0042] Currently, in order to prevent moisture in the air from entering the inside of the battery cell, the production needs to plug the injection hole in multiple processes such as primary injection, formation and secondary injection. Therefore, not only the length of the production line is lengthened, but also a large amount of glue nail cost is brought.
[0043] As shown in Figures 1 to 6 Some embodiments of the present application provide a single battery, mainly for reducing the cost of production equipment, reducing the consumption cost of glue nails, and improving the injection efficiency.
[0044] Among them, the single battery has a height direction Z.
[0045] The single battery includes a shell 100, an electrode assembly 200, a top cover 300, an insulating piece 400 and a liquid blocking piece 500.
[0046] Among them, the shell 100 is provided with a containing cavity 110, and the electrode assembly 200 is arranged in the containing cavity 110, so as to provide protection and limiting effect for the electrode assembly 200 by the shell 100.
[0047] The top cover 300 is connected to the shell 100 along the height direction Z to cover and seal the containing cavity 110, and the connection mode includes any one of bonding, clamping, threaded connection, bolt connection and hot melting connection, which can be specifically set according to the actual situation. The containing cavity 110 is sealed by the top cover 300 to form a sealed containing cavity 110, so as to provide protection and limiting effect for the electrode assembly 200 by the top cover 300 and the shell 100, so as to ensure the stability of the electrode assembly 200 in the containing cavity 110.
[0048] In addition, the top cover 300 is provided with a boss 310 on the side close to the electrode assembly 200, the boss 310 protrudes in the direction close to the electrode assembly 200 along the height direction Z, the boss 310 is provided with a liquid injection hole 311 penetrating along the height direction Z, so as to communicate the accommodation cavity 110 with the external space of the shell 100 through the liquid injection hole 311, that is, the liquid can be injected into the electrode assembly 200 in the accommodation cavity 110 through the liquid injection hole 311.
[0049] The insulating piece 400 is arranged on the side of the top cover 300 close to the electrode assembly 200, and is provided with a liquid passing hole 410 penetrating along the height direction Z, the boss 310 is located in the liquid passing hole 410, the side wall of the boss 310 abuts against the hole wall of the liquid passing hole 410, so as to form a limiting connection structure, which improves the accuracy of the connection between the insulating piece 400 and the top cover 300 and improves the connection efficiency. It should be noted that the height of the boss 310 is less than the depth of the liquid passing hole 410.
[0050] In the embodiment, the liquid passing hole 410 communicates with the liquid injection hole 311.
[0051] In some embodiments, the liquid passing hole 410 is coaxially arranged with the liquid injection hole 311. Since a part of the boss 310 is located in the liquid passing hole 410, and the liquid injection hole 311 penetrates the boss 310 along the height direction Z, that is, the hole diameter of the liquid injection hole 311 is less than the hole diameter of the liquid passing hole 410, by adjusting the hole diameter of the liquid injection hole 311, the flow of the liquid injection is controlled, so as to control the liquid injection efficiency to the electrode assembly 200.
[0052] In addition, the liquid blocking piece 500 is arranged on the side of the insulating piece 400 close to the electrode assembly 200, the liquid blocking piece 500 is an elastic liquid blocking piece, a part of the liquid blocking piece 500 abuts against the boss 310 along the height direction Z, the projection of a part of the liquid blocking piece 500 along the height direction Z is located in the liquid passing hole 410, and a part of the liquid blocking piece 500 along the height direction Z blocks the liquid injection hole 311, so as to form a blocking effect on the external air and moisture through the liquid blocking piece 500, to prevent the external moisture from entering the electrode assembly 200 through the liquid injection hole 311, and the liquid blocking piece 500 can swing up and down with the positive and negative pressure of the liquid injection or formation, so as to leave enough space to meet the entry and exit of the gas and the liquid in the liquid injection hole 311.
[0053] It can be understood that when normal liquid injection, the liquid blocking piece 500 can be moved into the accommodation cavity during liquid injection, so as to reduce the overlapping area between the liquid blocking piece 500 and the height direction Z and the liquid injection hole 311, so as to facilitate the liquid injection into the electrode assembly 200. When the liquid injection negative pressure, the blocking piece bends upward, forms a negative pressure channel, and blocks the liquid injection hole 311 through the liquid blocking piece 500, so as to prevent external water vapor from entering the electrode assembly 200 through the liquid injection hole 311, so as to form a protective effect on the electrode assembly 200. Not only meet the production requirements of liquid injection and formation process, but also save the action of plugging the nail, simplify the process, and reduce the cost.
[0054] As shown in Figure 4 , Figure 5 and Figure 7 , in some embodiments, the liquid blocking piece 500 is arranged on the side of the insulating piece 400 away from the top cover 300. It can be understood that the liquid blocking piece 500 is accommodated in the accommodation cavity 110 and located between the electrode assembly 200 and the insulating piece 400.
[0055] Among them, the liquid blocking piece 500 includes a connecting part 510 and a shielding part 520 connected with each other, and the connecting part 510 is connected with the insulating piece 400. The connection mode includes at least one of bonding, clamping, hot pressing, hot melting, ultrasonic welding, laser welding and injection molding, so as to ensure the stability of the connection between the liquid blocking piece 500 and the insulating piece 400.
[0056] In addition, the shielding part 520 abuts against the boss 310 along the height direction Z, the projection of the shielding part 520 along the height direction Z is located in the liquid passing hole 410, and the shielding part 520 shields the liquid injection hole 311 along the height direction Z, so as to form a blocking effect on the water vapor outside the shell 100 through the shielding part 520, and prevent the external water vapor from entering the electrode assembly 200 through the liquid injection hole 311.
[0057] As shown in Figures 8 to 11 , in some embodiments, the single battery has a length direction X intersecting the height direction Z, the shielding part 520 is provided with a gap part 521, the gap part 521 penetrates the shielding part 520 along the height direction Z, the gap part 521 communicates the liquid injection hole 311 and the accommodation cavity 110, and the gap part 521 partially extends along the length direction X.
[0058] By arranging the gap portion 521 on the shielding portion 520 to divide the shielding portion 520 into at least two sub-shielding portions through the gap portion, so that each sub-shielding portion on the shielding portion 520 is subjected to equal external force when the shielding portion 520 is subjected to external force, and the volume of the sub-shielding portion is smaller than the volume of the shielding portion 520. Since the shielding portion 520 has elastic force, under the condition of equal external force, the smaller the stressed volume, the greater the deformation ability, so that the sub-shielding portion is more easily bent under the action of external force, so that the shielding portion 520 provided with the gap portion 521 is more easily bent under the action of external force, thereby increasing the bending performance of the shielding portion 520 and improving the toughness of the shielding portion 520.
[0059] The gap portion 521 can be one of a strip-shaped hole, a fold line-shaped hole, and an arc-shaped hole, which can be specifically set according to actual conditions.
[0060] As shown in Figure 8 and Figure 9 In some embodiments, the gap portion 521 includes a first strip-shaped hole 5211 extending along the length direction X, and the first strip-shaped hole 5211 penetrates the edge of the shielding portion 520 away from the connecting portion 510 along the length direction X, so as to separate the shielding portion 520 into two sub-shielding portions through the first strip-shaped hole 5211. These two sub-shielding portions can be folded individually, so as to further improve the folding performance of the shielding portion 520.
[0061] As shown in Figures 9 to 11 In some embodiments, the single battery has a width direction Y intersecting with the height direction Z and the length direction X, and the gap portion 521 further includes a second strip-shaped hole 5212 extending along the width direction Y, and the second strip-shaped hole 5212 communicates with the first strip-shaped hole 5211.
[0062] In the present embodiment, the first strip-shaped hole 5211 and the second strip-shaped hole 5212 intersect to form a communication portion, and the first strip-shaped hole 5211 and the second strip-shaped hole 5212 communicate through the communication portion.
[0063] By arranging the first strip-shaped hole 5211 and the second strip-shaped hole 5212 communicating with each other on the shielding portion 520, the folding performance of the shielding portion 520 is further improved, so as to improve the liquid injection efficiency.
[0064] In addition, the length of the first strip-shaped hole 5211 and the length of the second strip-shaped hole 5212 can be specifically set according to actual conditions.
[0065] As shown in Figure 9As shown in some embodiments, the second strip-shaped channel 5212 communicates with the first strip-shaped channel 5211 at the center of the length direction X, and the first strip-shaped channel 5211 and the second strip-shaped channel 5212 cross-communicate to divide the second strip-shaped channel 5212 into two flow channels through the first strip-shaped channel 5211, and the two flow channels are symmetrically arranged along the length direction X.
[0066] In some embodiments, the first strip-shaped channel 5211 and the second strip-shaped channel 5212 communicate at the center, i.e., the first strip-shaped channel 5211 and the second strip-shaped channel 5212 are respectively symmetric about the center, and a "cross" channel is formed on the shielding part 520 through the communication of the first strip-shaped channel 5211 and the second strip-shaped channel 5212.
[0067] In some embodiments, the center of the "cross" channel coincides with the center of the shielding part 520, so that an external liquid injector can pass through the "cross" channel and inject liquid to the electrode assembly 200, thereby improving the liquid injection efficiency.
[0068] As shown in some embodiments, the second strip-shaped channel 5212 communicates with the first strip-shaped channel 5211 at one end of the length direction X, and the second strip-shaped channel is close to the connecting part, and the first strip-shaped channel 5211 penetrates through the edge of the shielding part 520 along the length direction X away from the one end of the connecting part 510, so as to form a "T" channel on the shielding part 520 through the communication of the first strip-shaped channel 5211 and the second strip-shaped channel 5212. Figure 10 Figure 11 As shown in some embodiments, the second strip-shaped channel 5212 communicates with the first strip-shaped channel 5211 at one end of the length direction X, and the second strip-shaped channel is close to the connecting part, and the first strip-shaped channel 5211 penetrates through the edge of the shielding part 520 along the length direction X away from the one end of the connecting part 510, so as to form a "T" channel on the shielding part 520 through the communication of the first strip-shaped channel 5211 and the second strip-shaped channel 5212.
[0069] In some embodiments, the second strip-shaped channel 5212 communicates with the first strip-shaped channel 5211 at one end of the length direction X, and the second strip-shaped channel is away from the connecting part 510, and the second strip-shaped channel 5212 is away from the edge of the shielding part 520 away from the connecting part 510.
[0070] Specifically, the second strip-shaped channel 5212 is away from the connecting part 510, and a "T" channel is formed on the shielding part 520 through the communication of the first strip-shaped channel 5211 and the second strip-shaped channel 5212.
[0071] In some embodiments, the liquid blocking piece 500 is an elastic liquid blocking piece, so that the elastic liquid blocking piece can be elastically deformed under the action of an external force, and the elastic liquid blocking piece can return to the initial state after the external force is removed.
[0072] In some embodiments, the liquid blocking piece 500 is made of an insulating material.
[0073] The shielding piece can be made of a non-metal material or a metal material.
[0074] Since the metal material may be broken and dropped due to repeated folding, in the embodiment, the shielding member is a non-metal material.
[0075] In the embodiment, the material of the liquid blocking member 500 can be PPS (Polyphenylene sulfide) or POM (Polyoxymethylene) or other elastic materials.
[0076] In some embodiments, the thickness of the shielding member is less than or equal to 2 mm. In the case of meeting the conditions of not being bent due to self-weight and broken by electrolyte impact, the thickness of the shielding member is reduced to reduce the weight of the shielding member itself and improve the bending performance of the shielding member.
[0077] It should be noted that the initial state here refers to the state when the liquid blocking member 500 is not subjected to external force and the shielding part 520 blocks the liquid injection hole 311. That is, in the initial state, the liquid blocking member 500 can block the water vapor outside the shell 100 to prevent the external water vapor from entering the electrode assembly 200, thereby forming a protective effect on the electrode assembly 200.
[0078] It can be understood that when it is necessary to inject electrolyte into the electrode assembly 200, the liquid blocking member 500 is away from the liquid injection hole 311 under the action of external force, thereby opening the liquid injection hole 311, so that the external electrolyte can be injected into the electrode assembly 200 through the liquid injection hole 311, thereby realizing liquid injection.
[0079] As shown in Figure 5 and Figure 7 In the embodiment, part of the elastic liquid blocking member abuts against the boss 310 along the height direction Z to ensure that the elastic liquid blocking member can cover the liquid injection hole 311 when it is not subjected to external force, thereby preventing external water vapor from entering the electrode assembly 200.
[0080] As shown in Figure 5 and Figure 7 In some embodiments, at least part of the boss 310 is located in the liquid passing hole 410 to form a limiting structure by connecting the side wall of the boss 310 and the hole wall of the liquid passing hole 410, which not only ensures the accuracy and stability of the connection between the top cover 300 and the insulating member 400, but also improves the assembly efficiency.
[0081] Among them, part of the liquid blocking member 500 projects on the boss 310 along the height direction Z is located in the liquid injection hole 311 to form a shielding effect on the liquid injection hole 311 by the liquid blocking member 500. It can be understood that the area of the side of the liquid blocking member 500 facing the liquid injection hole 311 is less than or equal to the area of the liquid injection hole 311.
[0082] It should be noted that in the embodiment, the part of the liquid blocking piece 500 refers to the shielding part 520, that is, the projection of the shielding part 520 on the boss 310 in the height direction Z is located in the liquid injection hole 311. That is, the diameter or length and width of the shielding part 520 should be less than or equal to the diameter or length and width of the liquid injection hole 311, so as to avoid that the shielding part 520 is too large to affect the liquid injection efficiency.
[0083] In some embodiments, the diameter of the shielding part 520 is between 90% and 95% of the diameter of the liquid injection hole 311. It should be noted that when the shielding part 520 is too large, it will block the liquid injection hole 311 and affect the liquid injection effect, and when the shielding part 520 is too small, it cannot effectively block the water vapor outside the shell 100, therefore, by controlling the effective shielding area of the shielding part 520 to the liquid injection hole 311, the effective shielding of the shielding part 520 to the liquid injection hole 311 is ensured, and the liquid injection efficiency is ensured.
[0084] The application provides a battery pack comprising the single battery as described in any one of the above embodiments.
[0085] It can be understood that the battery pack has the structure of the single battery and the beneficial effects thereof, which will not be repeated here.
[0086] In all examples shown and described herein, any specific values should be interpreted as merely exemplary and not as a limitation, and thus, other examples of the example embodiments can have different values.
[0087] It should be noted that similar reference numbers and letters represent similar items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.
[0088] The above-described embodiments only express several implementation manners of the application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the application. It should be noted that for those skilled in the art, without departing from the concept of the application, several modifications and improvements can be made, which are all within the protection scope of the application.
Claims
1. A single cell, characterized by, The monomer battery has a height direction (Z), and the monomer battery comprises: A shell (100) in which a containing cavity (110) is arranged; An electrode assembly (200) arranged in the containing cavity (110); A top cover (300) connected to the shell (100) along the height direction (Z) to cover the containing cavity (110), wherein a boss (310) is arranged on a side of the top cover (300) close to the electrode assembly (200), the boss (310) protrudes towards the electrode assembly (200) along the height direction (Z), and a liquid injection hole (311) is arranged through the boss (310) along the height direction (Z); An insulation piece (400) arranged in the containing cavity (110), wherein the insulation piece (400) is arranged on a side of the top cover (300) facing the electrode assembly (200), a liquid passing hole (410) is arranged through the insulation piece (400) along the height direction (Z), the boss (310) is arranged in the liquid passing hole (410), and the liquid passing hole (410) is in communication with the liquid injection hole (311); A liquid blocking piece (500) arranged on a side of the insulation piece (400) close to the electrode assembly (200), wherein the liquid blocking piece (500) is an elastic liquid blocking piece, a part of the liquid blocking piece (500) abuts against the boss (310) along the height direction (Z), a projection of a part of the liquid blocking piece (500) along the height direction (Z) is arranged in the liquid passing hole (410), and a part of the liquid blocking piece (500) along the height direction (Z) blocks the liquid injection hole (311).
2. The cell according to claim 1, wherein The liquid blocking piece (500) comprises a connecting part (510) and a blocking part (520) connected to each other, the connecting part (510) is connected to the insulation piece (400), the blocking part (520) abuts against the boss (310) along the height direction (Z), a projection of the blocking part (520) along the height direction (Z) is arranged in the liquid passing hole (410), and the blocking part (520) blocks the liquid injection hole (311) along the height direction (Z).
3. The cell according to claim 2, wherein The monomer battery has a length direction (X) intersecting the height direction (Z), the blocking part (520) is provided with a gap part (521) arranged through the blocking part (520) along the height direction (Z), the gap part (521) is in communication with the liquid injection hole (311) and the containing cavity (110), and the gap part (521) partially extends along the length direction (X).
4. The cell according to claim 3, wherein The gap part (521) comprises a first strip-shaped hole (5211) extending along the length direction (X), and an end of the first strip-shaped hole (5211) away from the connecting part (510) penetrates an edge of the blocking part (520) along the length direction (X).
5. The cell according to claim 4, wherein The monomer battery has a width direction (Y) intersecting with the height direction (Z) and the length direction (X) two by two; the gap part (521) further comprises a second strip-shaped channel (5212), the second strip-shaped channel (5212) extends along the width direction (Y), and the second strip-shaped channel (5212) communicates with the first strip-shaped channel (5211).
6. The cell according to claim 5, wherein The second strip-shaped channel (5212) communicates with the first strip-shaped channel (5211) at the center of the length direction (X), the first strip-shaped channel (5211) and the second strip-shaped channel (5212) cross-communicate, and the first strip-shaped channel (5211) divides the second strip-shaped channel (5212) into two flow channels, and the two flow channels are symmetrically arranged along the length direction (X).
7. The cell according to claim 5, wherein The second strip-shaped channel (5212) communicates with one end of the first strip-shaped channel (5211) along the length direction (X); the second strip-shaped channel (5212) is close to the connecting part (510), and one end of the first strip-shaped channel (5211) away from the connecting part (510) penetrates through the edge of the shielding part (520) along the length direction (X).
8. The cell according to claim 5, wherein The second strip-shaped channel (5212) communicates with one end of the first strip-shaped channel (5211) along the length direction (X); the second strip-shaped channel (5212) is away from the connecting part (510), and the second strip-shaped channel (5212) is away from the edge of one end of the shielding part (520) away from the connecting part (510).
9. The cell according to claim 1, wherein The liquid blocking piece (500) is made of insulating material.
10. A battery pack, characterized by, The monomer battery comprises the single battery as claimed in any one of claims 1 to 9.