Battery cell and battery

Abstract

The utility model relates to the technical field of battery technology, in particular to a battery cell and a battery, the battery cell comprises a pole group end plate, the pole group end plate comprises a main body part, and the main body part is provided with a mounting part; the shape of the mounting part is matched with that of the lower plastic part, the lower plastic part is arranged in the mounting part, and the mounting part surrounds part of the wall surface of the lower plastic part; the battery core pole group comprises a pole lug, the main body part is provided with a mounting cavity, and the mounting cavity is used for accommodating the pole lug. According to the battery cell provided by the invention, the lower plastic part is wrapped by the pole group end plate in a manner of mounting the lower plastic part in the pole group end plate, so that the pole group end plate and the lower plastic part are mutually limited and positioned, and meanwhile, the special accommodating and mounting cavities are formed for the tabs so as to protect the tabs; the risks of extrusion and tearing of the tabs caused by relative displacement of the pole group end plate and the lower plastic part are effectively reduced, and the risk of thermal runaway is reduced, so that the power supply stability and safety of the battery cell are improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery technology, and in particular to a battery cell and a battery. Background Art

[0002] At present, lithium-ion batteries have high energy density, long service life, high rated voltage, high power tolerance, low self-discharge, high charging efficiency, wide operating temperature range, high average output voltage, high output power, and fast charging and discharging. They have been widely used in various fields such as power, energy storage, and smart home.

[0003] The structure of lithium-ion battery includes: cover plate, shell, pole group end plate, wall plate, bare cell insulation sheet, pole group, etc. After the cover plate and shell are welded, a closed space with certain mechanical strength is formed to protect the pole group; after the wall plate and bare cell insulation sheet are welded and fixed, they are wrapped around the outside of the pole group, and the bare cell insulation sheet is melted and fixed with the plastic parts of the positive and negative pole cover plates, so that the pole group is well fixed in the shell.

[0004] The electrode group end plate is an important component of the battery cell structure. Its function is not only to facilitate the insulation packaging of the bare battery cell insulation sheet to the electrode group and then put it into the shell, but the most important thing is that the baffle part isolates and protects the battery cell ears to prevent the ears from stretching and damaging or bending and touching the electrode group below, causing the battery cell to short-circuit.

[0005] Currently, the positioning of the electrode end plate in the shell mainly relies on the hot melting of the electrode end plate and the Mylar film, which has low strength. When subjected to severe environments such as vibration, the electrode end plate will shake inside the battery, which has limitations in protecting the ear from bending and poses a risk of tearing. The product is more likely to experience risks such as thermal runaway. Utility Model Content

[0006] The purpose of the present application is to provide a battery cell and a battery, so as to solve to a certain extent the technical problem existing in the prior art that the battery cell is prone to the risk of tab tearing when subjected to severe working conditions such as severe vibration.

[0007] The present application provides a battery cell, comprising: an electrode group end plate, the electrode group end plate comprising a main body, the main body being provided with a mounting portion;

[0008] A lower plastic part, the shape of the mounting portion matches the shape of the lower plastic part, the lower plastic part is arranged in the mounting portion, and the mounting portion surrounds a part of the wall surface of the lower plastic part;

[0009] A battery cell pole group, the battery cell pole group includes pole ears, the main body is provided with a mounting cavity, and the mounting cavity is used to accommodate the pole ears.

[0010] In the above technical solution, further, the battery cell also includes a cover plate, and the lower plastic part is arranged on the cover plate; the wall surfaces of the lower plastic part except for one side wall surface in contact with the cover plate are all located in the installation part.

[0011] In any of the above technical solutions, further, the main body includes a plurality of wall panels, and the plurality of wall panels are connected end to end in sequence to form an annular frame structure;

[0012] The annular frame structure has a first port and a second port distributed in the axial direction, and the first port forms the mounting portion.

[0013] In any of the above technical solutions, further, the pole group end plate further includes: a first support member and a second support member; the first support member and the second support member are both arranged in the main body, the main body is in a long strip shape, and the first support member and the second support member are arranged at intervals along the length direction of the main body;

[0014] When the lower plastic part is mounted on the mounting portion, both the first support member and the second support member are in contact with the lower plastic part.

[0015] In any of the above technical solutions, further, two of the wall panels among the plurality of wall panels are respectively a first end panel and a second end panel, and the first end panel and the second end panel are distributed along the length direction of the main body;

[0016] The first end plate, the first support member, the second support member and the second end plate are sequentially arranged in intervals along the length direction of the main body.

[0017] In any of the above technical solutions, further, the main body also includes a bottom plate, and the bottom plate is arranged on the second port; in the main body, the first support member, the second support member and a part of the bottom plate jointly define the installation cavity.

[0018] In any of the above technical solutions, further, the bottom plate includes:

[0019] first plate portion;

[0020] The second plate portion;

[0021] a third plate portion, wherein the first plate portion, the second plate portion and the third plate portion are arranged in sequence along the length direction of the main body portion, the second plate portion is arranged opposite to the mounting cavity, and the second plate portion is provided with a penetration portion for penetrating the pole ear;

[0022] A first step portion is formed between the second plate portion and the first plate portion, and a second step portion is formed between the second plate portion and the third plate portion.

[0023] In any of the above technical solutions, further, along the installation direction of the lower plastic part to the installation portion, the diameter of the first port is gradually reduced to form a first guide portion at the first port;

[0024] The lower plastic part is provided with a plurality of top edges, and each of the top edges is provided with a second guide portion.

[0025] In any of the above technical solutions, further, some of the wall panels among the plurality of wall panels are provided with a connecting portion;

[0026] The bottom plate is provided with a first through hole, and the lower plastic part is provided with a second through hole, and the second through hole can be communicated with the first through hole.

[0027] The present application also provides a battery, comprising the battery cell described in any of the above technical solutions, and thus having all the beneficial technical effects of the battery cell, which will not be repeated here.

[0028] Compared with the prior art, the beneficial effects of this application are:

[0029] The battery cell provided in the present application includes: a pole group end plate, the pole group end plate includes a main body, and the main body is provided with a mounting portion; a lower plastic part, the shape of the mounting portion is adapted to the shape of the lower plastic part, the lower plastic part is arranged in the mounting portion, and the mounting portion surrounds part of the wall surface of the lower plastic part; a battery cell pole group, the battery cell pole group includes a pole ear, and the main body is provided with a mounting cavity, and the mounting cavity is used to accommodate the pole ear.

[0030] The battery cell provided in the present application realizes that the pole group end plate wraps the lower plastic part by installing the lower plastic part into the pole group end plate, thereby realizing mutual limitation and positioning between the pole group end plate and the lower plastic part. At the same time, a special accommodating and installing cavity is provided for the pole ear to protect the pole ear, effectively reducing the risk of relative displacement between the pole group end plate and the lower plastic part causing squeezing and tearing of the pole ear, reducing the risk of thermal runaway, thereby improving the power supply stability and safety of the battery cell.

[0031] The battery provided in the present application includes the battery cell described above. Therefore, the protection effect of the pole ear is improved through the battery cell, and the probability of relative movement between the pole group end plate and the lower plastic part is reduced, thereby reducing the risk of extrusion and tearing of the pole ear, and significantly improving the safety of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 A schematic diagram of the structure of a battery cell provided in an embodiment of the present application;

[0034] Figure 2 for Figure 1 Section view along AA;

[0035] Figure 3 for Figure 2 A schematic diagram of the enlarged structure at M;

[0036] Figure 4 A schematic diagram of the structure of the lower plastic part and the electrode group end plate of the battery cell provided in an embodiment of the present application in an assembled state;

[0037] Figure 5 Another perspective view of the lower plastic part and the electrode group end plate of the battery cell provided in the embodiment of the present application in an assembled state;

[0038] Figure 6 A schematic diagram of the structure of the electrode group end plate of the battery cell provided in an embodiment of the present application.

[0039] Figure markings: 1-pole group end plate, 101-main body, 1011-first end plate, 1012-second end plate, 1013-first side plate, 1014-second side plate, 102-installing portion, 103-bottom plate, 1031-first plate portion, 1032-second plate portion, 1033-third plate portion, 1034-first step portion, 1035-second step portion, 1036-penetrating portion, 104-installing cavity, 105-first support member, 106-second support member, 107-connecting portion, 108-first through hole, 109-first guide portion, 2-lower plastic part, 201-second guide portion, 202-second through hole, 203-bottom wall surface, 204-side wall surface, 3-cover plate. DETAILED DESCRIPTION

[0040] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0041] The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed, but merely represents the selected embodiments of the present application.

[0042] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0043] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0044] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0045] Refer to the following Figures 1 to 6 The battery cell and the battery according to the embodiments of the present application are described.

[0046] See also Figures 1 to 6 As shown, an embodiment of the present application provides a battery cell, which includes: a pole group end plate 1, a lower plastic part 2 and a battery cell pole group (not shown in the figure), wherein the pole group end plate 1 includes a main body 101, a mounting portion 102 is provided on the main body 101, and the lower plastic part 2 is arranged in the mounting portion 102. In this embodiment, preferably, the shape of the mounting portion 102 is adapted to the shape of the lower plastic part 2, and more preferably, the depth of the mounting portion 102 is greater than the overall thickness of the lower plastic part 2, so that the lower plastic part 2 is completely arranged in the mounting portion 102 in an embedded manner. After the pole group end plate 1 and the lower plastic part 2 are assembled with each other, the mounting portion 102 can cover the other wall surfaces of the lower plastic part 2 except the upper surface, thereby effectively limiting the pole group end plate 1 and the lower plastic part 2. The battery cell pole group includes a pole ear, and the main body 101 is provided with a mounting cavity 104, which can accommodate and be used to install the pole ear, and the pole ear is connected to the output pole of the present battery cell. In this embodiment, by providing an installation cavity 104, the joint position between the pole group end plate 1 and the lower plastic part 2 is separated from the accommodation position of the pole ear. The installation cavity 104 can limit and protect the pole ear. When the battery cell is subjected to bumps, due to the mutual limiting effect between the pole group end plate 1 and the lower plastic part 2, the relative position between the pole group end plate 1 and the lower plastic part 2 can be kept stable, and there will be no large position change between the two. At the same time, the pole ear will not move or change its position relative to the main body 101 and the lower plastic part 2, thereby effectively reducing the risk of the pole ear tearing.

[0047] Furthermore, the main body 101 includes a plurality of wall panels, which are connected end to end in sequence to form an annular frame structure; the annular frame structure has a first port and a second port distributed along the axial direction, and the first port forms the mounting portion 102 .

[0048] In this embodiment, the number of wall panels is preferably four, the main body 101 is in the shape of a long strip as a whole, two of the four wall panels are end panels, the two end panels are respectively a first end panel 1011 and a second end panel 1012, the other of the four wall panels are side panels, the two side panels are respectively a first side panel 1013 and a second side panel 1014, wherein the first end panel 1011 and the second end panel 1012 are arranged parallel to each other and face each other, and the first end panel 1011 and the second end panel 1012 are arranged sequentially along the length direction of the main body 101, One end of the first side plate 1013 is connected to the first end plate 1011, the other end of the first side plate 1013 is connected to the second end plate 1012, the second side plate 1014 and the first side plate 1013 are arranged at intervals along the width direction of the main body 101, the second side plate 1014 is parallel to and directly opposite to the first side plate 1013, one end of the second side plate 1014 is connected to the first end plate 1011, and the other end of the second side plate 1014 is connected to the second end plate 1012, thereby forming an annular frame structure of the main body 101. Preferably, the first end plate 1011, the second end plate 1012, the first side plate 1013 and the second side plate 1014 are integrally processed and formed.

[0049] The annular frame structure has a first port and a second port distributed along its axis. Figure 2 In the state shown, the first port is located above the second port, and a mounting portion 102 is formed at the first port. The lower plastic part 2 can be completely embedded in the main body 101 through the first port.

[0050] Furthermore, the main body 101 also includes a bottom plate 103, which is arranged at the second port. After the battery cell is assembled, the bottom plate 103 can support and limit the end face of the pole group of the battery cell. Furthermore, the battery cell also includes a first support member 105 and a second support member 106. Preferably, the first support member 105 and the second support member 106 both have a flat plate structure. The first support member 105 and the second support member 106 are arranged at intervals in the annular frame structure of the main body 101. One of the large faces of the first support member 105 is arranged facing the first end plate 1011, and another large face of the first support member 105 is arranged facing one of the large faces of the second support member 106. Another large face of the second support member 106 is arranged facing the second end plate 1012. Along the length direction of the main body 101, the first end plate 1011, the first support member 105, the second support member 106 and the second end plate 1012 are arranged in sequence.

[0051] Preferably, one of the two parallel sides of the first support member 105 is connected to the first side panel 1013, and the other is connected to the second side panel 1014. Similarly, the second support member 106 is also connected to the first side panel 1013 and the second side panel 1014 at the same time. More preferably, the first support member 105, the second support member 106 and the main body 101 have an integral structure.

[0052] The height of the first support member 105 is smaller than the heights of the first end plate 1011, the second end plate 1012, the first side plate 1013 and the second side plate 1014, and the height of the second support member 106 is the same as the height of the first support member 105, so that when the lower plastic part 2 is assembled with the main body 101, the first support member 105 and the second support member 106 will not affect the lower plastic part 2. After the lower plastic part 2 is assembled in place, the first support member 105 and the second support member 106 can contact the lower plastic part 2, thereby supporting the lower plastic part 2.

[0053] Further, as described above, the first support member 105 and the second support member 106 are spaced apart so that inside the main body 101, the first support member 105, the second support member 106 and a portion of the surface of the first side plate 1013 and a portion of the surface of the second side plate 1014 together enclose an installation cavity 104, and the installation cavity 104 and the cavity between the first support member 105 and the first end plate 1011, and the cavity between the second support member 106 and the second end plate 1012 are independently arranged, thereby providing an independent accommodation and installation space for the pole ear, which can protect the pole ear.

[0054] Furthermore, the bottom plate 103 includes a first plate portion 1031, a second plate portion 1032 and a third plate portion 1033, wherein the first plate portion 1031, the second plate portion 1032 and the third plate portion 1033 are arranged in sequence along the length direction of the main body 101, the first plate portion 1031 is arranged between the first end plate 1011 and the first support member 105, and the first plate portion 1031 is simultaneously connected to the inner wall surface of the first end plate 1011, the side wall surface 204 of the first support member 105 facing the first end plate 1011, the inner wall surface of the first side edge and the inner wall surface of the second side plate 1014, preferably, the first plate portion 1031 has an integral structure with the main body 101 and the first support member 105; the second plate portion 1032 is arranged on the first support member 105, and the first plate portion 1031 is connected to the inner wall surface of the first end plate 1011, the side wall surface 204 of the first support member 105 facing the first end plate 1011, the inner wall surface of the first side edge and the inner wall surface of the second side plate 1014. 105 and the second support member 106, the second plate portion 1032 is connected to the wall surfaces facing each other of the first support member 105 and the second support member 106, and is also connected to the inner wall surfaces of the first side plate 1013 and the inner wall surfaces of the second side plate 1014. Preferably, the second plate portion 1032 has an integral structure with the main body 101, the first support member 105, and the second support member 106; the third plate portion 1033 is arranged between the second support member 106 and the second end plate 1012, and the third plate portion 1033 is connected to the first end plate 1011, the second support member 106 and the first side plate 1013, the second side plate 1014. Preferably, the third plate portion 1033 has an integral structure with the main body 101 and the second support member 106.

[0055] Furthermore, a first step portion 1034 is formed between the first plate portion 1031 and the second plate portion 1032, and a second step portion 1035 is formed between the second plate portion 1032 and the third plate portion 1033. The first step portion 1034 and the second step portion 1035 make the second plate portion 1032 not in the same plane as the first plate portion 1031 and the third plate portion 1033, and the second plate portion 1032 is offset relative to the first plate portion 1031 and the third plate portion 1033 toward the first port. The plate portion 1032, the first support member 105, the second support member 106 and part of the plate surface of the two side plates together enclose an installation cavity 104. The second plate portion 1032 is provided with a penetration portion 1036, and the penetration portion 1036 is in the shape of a long hole. The pole ear can be penetrated into the installation cavity 104 through the penetration portion 1036. In addition, since the second plate portion 1032 is staggered, there is enough space below the second plate portion 1032 to provide the required space for bending, fixing, etc. for the part of the pole ear that has not penetrated into the installation cavity 104.

[0056] Furthermore, a connecting portion 107 is respectively provided on the first side wall and the second side wall. The connecting portion 107 is specifically a notch provided on the first side wall and the second side wall. After the lower plastic part 2 is assembled to the mounting portion 102, the connecting portion 107 is still in an open state, so as to play a role in exhaust.

[0057] A first through hole 108 is provided on the bottom plate 103. Preferably, the first plate portion 1031 of the bottom plate 103 is provided with the first through hole 108. More preferably, the number of the first through holes 108 is multiple, and the multiple first through holes 108 are distributed in a matrix. A second through hole 202 is provided at a position of the lower plastic part 2 corresponding to the first plate portion 1031. The number of the second through holes 202 is also multiple, and the multiple second through holes 202 are distributed in a matrix. After the battery cell is assembled, the electrolyte is injected into the space below the electrode group end plate 1 through the first through hole 108 and the second through hole 202 so that the electrolyte can infiltrate the battery cell electrode group.

[0058] Furthermore, the first port is formed with a first guide portion 109, and along the axis of the main body 101 from the first port toward the second port, the upper end surfaces of the first end plate 1011, the first side plate 1013, the second end plate 1012 and the second side plate 1014 (that is, the end surfaces corresponding to the first port) are chamfered close to the side edges of the inner wall surface, so that the inner diameter of the first port gradually decreases.

[0059] The lower plastic part 2 is in the shape of an elongated strip, and includes a bottom wall surface 203 and four side wall surfaces 204 arranged on the bottom wall surface 203. The four side wall surfaces 204 are connected end to end in sequence to form an elongated ring. Preferably, the bottom wall surface 203 and the four side wall surfaces 204 of the lower plastic part 2 have an integral structure. The position where each side wall surface 204 of the lower plastic part 2 intersects with the bottom wall surface 203 forms a top edge. Each top edge is chamfered to form a second guide portion 201, so that a guide fillet is formed at the top edge. During the assembly of the lower plastic part 2 and the main body 101, each second guide portion 201 can correspond to a first guide portion 109 to guide the assembly of the lower plastic part 2 and the mounting portion 102, thereby improving the assembly accuracy of the lower plastic part 2 and the mounting portion 102, avoiding rigid extrusion between the two, causing damage to the lower plastic part 2 and / or the mounting portion 102, and affecting the assembly stability.

[0060] Furthermore, the blade also includes necessary structures of the battery such as a cover plate 3 and a pole, wherein the pole is arranged on the cover plate 3 and the lower plastic part 2 is also arranged on the cover plate 3 .

[0061] It should be noted that, in this embodiment, the mounting portion 102 covers the four side walls 204 and the bottom wall 203 of the lower plastic part 2 , or in other words, all the walls of the lower plastic part 2 except for the wall on one side in contact with the cover plate 3 are located inside the mounting portion 102 .

[0062] In summary, the battery cell provided in the present application realizes that the pole group end plate 1 wraps the lower plastic part 2 by installing the lower plastic part 2 into the pole group end plate 1, thereby realizing mutual limitation and positioning between the pole group end plate 1 and the lower plastic part 2, and at the same time, a special accommodating and mounting cavity 104 is provided for the pole ear to protect the pole ear, effectively reducing the risk of relative displacement between the pole group end plate 1 and the lower plastic part 2 causing squeezing and tearing of the pole ear, reducing the risk of thermal runaway, and thereby improving the power supply stability and safety of the battery cell.

[0063] An embodiment of the present application further provides a battery, comprising the battery cell described in any of the above embodiments, and thus having all the beneficial technical effects of the battery cell, which will not be described in detail herein.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cell, characterized in that: include: A pole group end plate, the pole group end plate comprising a main body, the main body being provided with a mounting portion; A lower plastic part, the shape of the mounting portion matches the shape of the lower plastic part, the lower plastic part is arranged in the mounting portion, and the mounting portion surrounds a part of the wall surface of the lower plastic part; A battery cell pole group, the battery cell pole group includes pole ears, the main body is provided with a mounting cavity, and the mounting cavity is used to accommodate the pole ears.

2. The battery cell according to claim 1, characterized in that: The battery core further includes a cover plate, and the lower plastic part is arranged on the cover plate; the wall surfaces of the lower plastic part except for one side wall surface in contact with the cover plate are all located in the mounting portion.

3. The battery cell according to claim 1, characterized in that: The main body includes a plurality of wall panels, and the plurality of wall panels are connected end to end in sequence to form an annular frame structure; The annular frame structure has a first port and a second port distributed in the axial direction, and the first port forms the mounting portion.

4. The battery cell according to claim 3, characterized in that: The pole group end plate further includes: a first support member and a second support member; the first support member and the second support member are both arranged in the main body, the main body is in a long strip shape, and the first support member and the second support member are arranged at intervals along the length direction of the main body; When the lower plastic part is mounted on the mounting portion, both the first support member and the second support member are in contact with the lower plastic part.

5. The battery cell according to claim 4, characterized in that: Two of the wall plates among the plurality of wall plates are respectively a first end plate and a second end plate, and the first end plate and the second end plate are distributed along the length direction of the main body; The first end plate, the first support member, the second support member and the second end plate are sequentially arranged in intervals along the length direction of the main body.

6. The battery cell according to claim 4, characterized in that: The main body also includes a bottom plate, which is arranged on the second port; in the main body, the first support member, the second support member and a part of the bottom plate jointly define the installation cavity.

7. The battery cell according to claim 6, characterized in that: The bottom plate comprises: first plate portion; The second plate portion; a third plate portion, wherein the first plate portion, the second plate portion and the third plate portion are arranged in sequence along the length direction of the main body portion, the second plate portion is arranged opposite to the mounting cavity, and the second plate portion is provided with a penetration portion for penetrating the pole ear; A first step portion is formed between the second plate portion and the first plate portion, and a second step portion is formed between the second plate portion and the third plate portion.

8. The battery cell according to claim 3, characterized in that: Along the installation direction of the lower plastic part to the installation portion, the diameter of the first port gradually decreases to form a first guide portion at the first port; The lower plastic part is provided with a plurality of top edges, and each of the top edges is provided with a second guide portion.

9. The battery cell according to claim 6, characterized in that: Some of the wall panels among the plurality of wall panels are provided with connecting portions; The bottom plate is provided with a first through hole, and the lower plastic part is provided with a second through hole, and the second through hole can be communicated with the first through hole.

10. A battery, characterized in that: A battery cell comprising the battery cell according to any one of claims 1 to 9.

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