Battery cell and battery pack

Abstract

The utility model discloses a battery monomer and a battery pack, and relates to the technical field of batteries. Each battery monomer comprises a battery cell body, a tab and an insulating sheet; the battery cell body is provided with two opposite end surfaces; the tab is connected to the end surface and is provided with a transition part and a connecting part which are connected; the insulating sheet is provided with a first insulating section, a second insulating section and a third insulating section which are connected, the first insulating section is attached to the battery cell body, the second insulating section covers the transition part, and the third insulating section is attached to the connecting part. According to the battery cell, the insulating sheets are arranged on the tabs, and the two ends of the insulating sheets in the width direction are glued, so that the insulating sheets are in a loose state after the insulating sheets, the battery cell body and the tabs are connected, the constraint of the insulating sheets on the tabs is reduced, the tabs are prevented from being torn, and the phenomena of short circuit and corrosion of the single batteries are prevented.

Description

TECHNICAL FIELD

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

[0002] The battery is roughly divided into a battery with a wound cell and a battery with a laminated cell. The battery forms a cell by stacking of a pole piece, and a tab leads out the positive and negative poles in the cell. In the battery manufacturing process, the existing tab has poor insulation effect, the connection between the tab and the pole piece of the cell is unstable, and even the tab is torn due to the pulling of the tab. CONTENT OF THE UTILITY MODEL

[0003] The utility model aims at providing a battery monomer and a battery pack to solve the technical problems of unstable connection between the tab and the pole piece of the cell and tab tearing.

[0004] In a first aspect, the utility model provides a battery monomer, which comprises a cell body, the cell body has two opposite end faces; a tab, the tab is connected to the end face of the cell body, the tab has a connected transition part and a connecting part; and an insulating sheet, which has a connected first insulating section, a second insulating section and a third insulating section, the first insulating section is attached to the cell body, the second insulating section covers the transition part, and the third insulating section is attached to the connecting part.

[0005] In some embodiments, the transition part comprises a folding part and a bending part, the bending part is connected between the folding part and the connecting part; the second insulating section comprises a first covering section and a second covering section, the second covering section is connected between the first covering section and the third insulating section; wherein the first covering section covers the outer surface of the folding part, and the second covering section covers the outer surface of the bending part.

[0006] In some embodiments, the first insulating section is attached to the cell body through a first adhesive layer, and the third insulating section is attached to the connecting part through a second adhesive layer.

[0007] In some embodiments, the connecting part comprises a connected adhesive area and a pole column connecting area, the second adhesive layer is arranged in the adhesive area; the battery monomer further comprises a pole column, the pole column is arranged in the pole column connecting area away from the cell body.

[0008] In some embodiments, the battery monomer further comprises a shell, the cell body is arranged in the shell, the shell is provided with a first opening; a first cover plate is connected with the shell and used for closing the first opening, the first cover plate is provided with a containing hole; the pole column comprises a first part and a second part connected with each other, the first part is arranged in the pole column connecting area, and the second part is installed in the containing hole.

[0009] In some embodiments, the battery monomer further comprises: an upper plastic, arranged on a side of the first cover plate away from the battery core body, the upper plastic being provided with a first mounting hole in communication with the accommodating hole, and the second part being further mounted in the first mounting hole.

[0010] In some embodiments, the battery monomer further comprises: a first lower plastic, connected with the first cover plate and arranged on a side of the first cover plate close to the battery core body, the first lower plastic being provided with a second mounting hole in communication with the accommodating hole, and the second part being further mounted in the second mounting hole.

[0011] In some embodiments, the shell is further provided with a second opening arranged opposite to the first opening; the battery monomer further comprises: a second cover plate, connected with the shell and used for closing the second opening, the first cover plate and the second cover plate being arranged at two ends of the shell respectively, the second cover plate being provided with an explosion-proof hole and a liquid injection hole; and an explosion-proof valve, arranged in the explosion-proof hole.

[0012] In some embodiments, the width of the first adhesive layer is greater than 2 mm; and the width of the second adhesive layer is greater than 2 mm.

[0013] In some embodiments, the width of the first adhesive layer is greater than 2 mm; and the width of the second adhesive layer is greater than 2 mm.

[0014] The technical effect of the utility model lies in providing a battery monomer and a battery pack, by arranging an insulating sheet on the tab and coating glue on both ends of the insulating sheet in the width direction, the insulating sheet is in a relaxed state after being connected with the battery core body and the tab, the constraint of the insulating sheet on the tab is reduced, and the phenomenon of tab tearing and battery monomer short circuit and corrosion is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0015] The technical scheme and other beneficial effects of the present application will be apparent from the following detailed description of specific embodiments of the present application, combined with the accompanying drawings.

[0016] Figure 1 The structure schematic diagram of the battery monomer provided by the embodiments of the present application is shown.

[0017] Figure 2 The structure schematic diagram of the battery monomer provided by the embodiments of the present application is shown. Figure 1 The local enlarged view of the A part.

[0018] Figure 3 The structure schematic diagram of the tab and the insulating sheet provided by the embodiments of the present application is shown.

[0019] Figure 4 The exploded view of the first end cover assembly provided by the embodiments of the present application is shown.

[0020] Figure 5 The exploded view of the second end cover assembly provided by the embodiments of the present application is shown.

[0021] The components in the drawings are identified as follows:

[0022] 1 cell body; 2 tab; 21 transition part; 22 connecting part; 211 folding part; 212 bending part; 221 bonding area; 222 pole connecting area; 3 insulating sheet; 31 first insulating section; 32 second insulating section; 321 first covering section; 322 second covering section; 33 third insulating section; 4 first bonding layer; 5 second bonding layer; 6 pole; 61 first part; 62 second part; 7 first cover plate; 71 accommodating hole; 8 upper plastic; 81 first mounting hole; 9 first lower plastic; 91 second mounting hole; 10 shell; 101 first opening; 102 second opening; 11 second cover plate; 111 explosion-proof hole; 112 liquid injection hole; 12 explosion-proof valve; 13 riveting block; 131 third mounting hole; 14 sealing ring; 15 second lower plastic; 151 protruding part; 152 air hole; 110 first end cover assembly; 120 second end cover assembly; Z first direction; X second direction; Y third direction. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0024] In the drawings, the shapes and sizes can be exaggerated for clarity, and the same reference signs will be used to indicate the same or similar components in all the drawings.

[0025] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship 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, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be understood as a limitation on the present application. In particular, "height" corresponds to the size from top to bottom, "width" corresponds to the size from left to right, and "depth" corresponds to the size from front to back, which are relative concepts, so it is possible that they will change accordingly according to different positions and different use states. Therefore, these or other orientations should not be used to interpret as limiting language.

[0026] The terms "first", "second", "third", etc. are used only for descriptive purposes and do not connote or imply relative importance or a quantity of the indicated technical features. Thus, a feature defined with "first", "second", etc. can explicitly or implicitly include one or more of the feature. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified and limited.

[0027] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mount", "connect", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, it can be direct connection, or indirect connection through intermediate medium, it can be internal communication of 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.

[0028] In the embodiments of the present application, the terms "a plurality of" and "a plurality of" refer to two or more than two. In the embodiments of the present application, unless otherwise specified, the description of "parallel" means that a certain error range is allowed to be approximately parallel, and the error range can be within an angle of less than or equal to 5° relative to the absolute parallel. The description of "vertical" means that a certain error range is allowed to be approximately vertical, and the error range can be within an angle of less than or equal to 5° relative to the absolute vertical.

[0029] Generally, after the tab of the battery monomer is welded with the cover plate, the two sides of the tab are pasted with insulating tape to prevent short circuit between the tab and the shell, and also to prevent the welding slag of the welding area of the tab and the cover plate from falling off. Since the insulating tape is coated with a glue layer on the whole surface, and the insulating tape completely covers the tab, it will cause the insulating tape to be in a tight state after the battery monomer is assembled, and the position of the tab changes slightly, the insulating tape pulls the tab, causing the tab to tear. After the tab is torn, the capacity of the battery monomer is lost, the cell material cannot play a role, and finally the cost is wasted.

[0030] To solve the above problems, the present application provides a battery monomer, which comprises a cell body, a tab and an insulating sheet. The cell body has two opposite end faces; the tab is connected to the end face, and the tab has a transition part and a connecting part connected thereto; the insulating sheet has a first insulating section, a second insulating section and a third insulating section connected thereto, the first insulating section is pasted on the cell body, the second insulating section covers the transition part, and the third insulating section is pasted on the connecting part. The present application sets the insulating sheet on the tab, and glues the two ends in the width direction of the insulating sheet, so that the insulating sheet, the cell body and the tab are connected, and the insulating sheet is in a relaxed state, so as to reduce the restraint of the insulating sheet on the tab, thereby avoiding the tearing of the tab and preventing the short circuit and corrosion of the battery monomer. The following will be described in detail.

[0031] As Figure 1 shown, the battery cell provided by the present application is in the shape of a cuboid, and based on this, an XYZ coordinate system is established, and the battery is defined to have a first direction Z, a second direction X and a third direction Y. The first direction Z, the second direction X and the third direction Y are perpendicular to each other in pairs. The battery cell is used in an electric device such as a vehicle, a ship or an aircraft, to provide electric energy to the above-mentioned devices. The battery disclosed in the embodiments of the present application includes but is not limited to those used in an electric device such as a vehicle, a ship or an aircraft. The electric device includes but is not limited to a mobile phone, a tablet, a notebook computer, an electric vehicle, an electric automobile, a ship, a spacecraft, etc.

[0032] The following embodiments are further descriptions based on the above-mentioned arrangement of 2 cells in the second direction X, which cannot be considered as a special limitation to the present application.

[0033] The battery cell includes a cell body 1, a tab 2 and an insulating sheet 3.

[0034] The cell body 1 has two end faces arranged opposite to each other along the first direction Z, two first faces arranged opposite to each other along the second direction X, and a second face arranged opposite to each other along the third direction Y. Among them, the end face is the surface of the cell body 1 with the smallest face, the first face is the surface of the cell body 1 with the largest area, and the second face is the surface between the area of the end face and the area of the first face. In other words, the first face is the large face of the cell body 1, and the end face and the second face are the small faces of the cell body 1.

[0035] The end face at the top of the cell body 1 is the head of the battery cell, and the end face at the bottom of the cell body 1 is the tail of the battery cell. The cell body 1 includes a positive plate, a negative plate and a separator, the positive plate and the negative plate are arranged in layers, and the separator is arranged between the positive plate and the negative plate to achieve the effect of insulating and spacing between the positive plate and the negative plate.

[0036] The cell body 1 is generally stacked in the manner of positive plate, separator, negative plate, separator, etc., and the tab 2 led out from the positive plate is a positive tab 2, and the tab 2 led out from the negative plate is a negative tab 2. Figure 1 It is shown that two tabs 2 with different polarities are located at the top end face of the cell body 1, and in other embodiments, the two tabs 2 with different polarities can be located at the bottom end face of the cell body 1, or the two tabs 2 with different polarities are located at the top end face and the bottom end face of the cell body 1 respectively, which is not particularly limited here.

[0037] As Figures 2-3 shown, the tab 2 is connected to the end face of the cell body 1 along the first direction Z, and the tab 2 has a transition part 21 and a connecting part 22 connected thereto.

[0038] Specifically, the transition portion 21 comprises a folding portion 211 and a bending portion 212, and the bending portion 212 is connected between the folding portion 211 and the connecting portion 22.

[0039] In the specific installation, all the tab 2 are folded and stacked together, and then are fixed on the end surface of the battery cell body 1 in the same direction, so that the tab 2 has the connecting portion 22 connected with the connecting piece, and the plurality of groups of tab 2 are connected together through the connecting piece and are electrically connected with the pole 6.

[0040] The insulating sheet 3 has a first insulating section 31, a second insulating section 32 and a third insulating section 33 connected together.

[0041] The first insulating section 31 is attached to the battery cell body 1, the second insulating section 32 covers the transition portion 21, and the third insulating section 33 is attached to the connecting portion 22. Therefore, by providing the insulating sheet 3 on the tab 2, and by gluing the two ends of the insulating sheet 3 in the width direction (the first direction Z) of the insulating sheet 3, that is, by gluing the first insulating section 31 and the third insulating section 33, the insulating sheet 3, the battery cell body 1 and the tab 2 are connected in a relaxed state, the restraint of the insulating sheet 3 on the tab 2 is reduced, and the tearing of the tab 2 is avoided, and the short circuit and corrosion of the battery cell are prevented.

[0042] In an embodiment, the first insulating section 31 is attached to the battery cell body 1 through a first adhesive layer 4, and the third insulating section 33 is attached to the connecting portion 22 through a second adhesive layer 5. The first adhesive layer 4 and the second adhesive layer 5 can be formed by gluing. Specifically, liquid glue is applied on the first insulating section 31 and the third insulating section 33, and then the first insulating section 31 is attached to the battery cell body 1, and the third insulating section 33 is attached to the connecting portion 22 of the tab 2, and after the liquid glue is solidified, the first adhesive layer 4 and the second adhesive layer 5 are formed.

[0043] In other embodiments, the first adhesive layer 4 and the second adhesive layer 5 can be adhesive tapes or other materials with adhesion, as long as the first insulating section 31 can be attached to the battery cell body 1, and the third insulating section 33 can be attached to the connecting portion 22 of the tab 2.

[0044] The width of the first adhesive layer 4 is greater than 2 mm, and the width of the second adhesive layer 5 is greater than 2 mm. Specifically, the size of the first adhesive layer 4 in the first direction Z is greater than 2 mm, and the size of the second adhesive layer 5 in the second direction X is greater than 2 mm. In this way, while achieving the connection of the insulating sheet 3 with the battery cell body 1 and the tab 2, the amount of glue can be further reduced to reduce the production cost of the battery cell.

[0045] Optionally, the size of the first adhesive layer 4 in the first direction Z (unit: mm) can be any one of 5, 6, 7, 8, 9, 10 or a value between any two of them. Similarly, the size of the second adhesive layer 5 in the second direction X (unit: mm) can be any one of 5, 6, 7, 8, 9, 10 or a value between any two of them.

[0046] Therefore, by segmenting the insulating sheet 3 and setting the gel body at the beginning and end of the two segments, the connection between the insulating sheet 3 and the electrode core body 1 and the tab 2 is achieved while reducing the connection area between the insulating sheet 3 and the tab 2, i.e. reducing the restraint of the tab 2 by the insulating sheet 3, so that after the battery monomer is assembled, the insulating sheet 3 is still in a relaxed state, reducing the pulling of the tab 2 by the insulating sheet 3, thereby reducing the risk of tearing of the tab 2, and further avoiding the loss of battery monomer capacity, ensuring the use effect of the electrode core material. In addition, the amount of glue can also be reduced to further reduce the production cost of the battery monomer.

[0047] The first insulating segment 31 can be attached to part of the first surface of the electrode core body 1, or the first insulating segment 31 can be completely attached to the first surface of the electrode core body 1, so as to insulate the outer surface of the electrode core body 1 and the inner surface of the shell 10, preventing short circuit between the electrode core body 1 and the shell 10.

[0048] As shown in FIG. 1, Figure 3 In one embodiment, the second insulating segment 32 includes a first covering segment 321 and a second covering segment 322, and the second covering segment 322 is connected between the first covering segment 321 and the third insulating segment 33. The first covering segment 321 covers the outer surface of the folding portion 211, and the second covering segment 322 covers the outer surface of the bending portion 212.

[0049] As shown in FIG. 1, Figures 2-3 The connecting portion 22 includes a connecting area 221 and a pole connecting area 222, and the second adhesive layer 5 is arranged on the connecting area 221.

[0050] As shown in FIG. 1, Figure 1 , Figure 4 and Figure 5 The battery monomer further includes a shell 10, a first end cover assembly 110 and a second end cover assembly 120. The first end cover assembly 110 includes a first cover body, and the second end cover assembly 120 includes a second cover body.

[0051] The shell 10 is provided with the cell body 1, the second cover plate 11 is arranged with the first cover plate 7, and the first cover plate 7 and the second cover plate 11 are arranged at two ends of the shell 10 respectively. The shell 10 has two side walls arranged oppositely along the first direction Z, one side wall is provided with a first opening 101, and the other side wall is provided with a second opening 102. The first cover plate 7 is arranged at the first opening 101 and closes the first opening 101, and the second cover plate 11 is arranged at the second opening 102 and closes the second opening 102. The shape of the first cover plate 7 is matched with the shape of the first opening 101, and the shape of the second cover plate 11 is matched with the shape of the second opening 102, so as to better close the openings on the shell 10 and protect the cell body 1 installed in the shell 10. The shell 10 is made of metal material aluminum to ensure that the battery has good heat dissipation effect. The shell 10 can also be made of copper, iron, aluminum alloy and the like.

[0052] The first cover plate 7 and the second cover plate 11 can be made of materials with certain hardness to avoid deformation of the first cover plate 7 or the second cover plate 11 when subjected to external force impact, and the external force is transmitted to the cell body 1 through the first cover plate 7 or the second cover plate 11, causing damage to the cell body 1.

[0053] As shown in Figure 4 The first cover plate 7 assembly further includes the pole 6, the upper plastic 8, the first lower plastic 9, the riveting block 13 and the sealing ring 14.

[0054] Specifically, the first cover plate 7 is arranged at the side of the tab 2 away from the cell body 1, and the first cover plate 7 is provided with a containing hole 71.

[0055] The pole 6 is arranged at the pole connecting area 222 away from the cell body 1. The pole 6 includes a first part 61 and a second part 62 connected with each other, the first part 61 is arranged at the pole connecting area 222, and the second part 62 is installed in the containing hole 71. The pole 6 includes a positive pole 6 and a negative pole 6, which are respectively located in the containing hole 71 on the first cover plate 7.

[0056] The upper plastic 8 is arranged at the side of the first cover plate 7 away from the cell body 1, and the upper plastic 8 is provided with a first installation hole 81 communicated with the containing hole 71, and the second part 62 is further installed in the first installation hole 81. It can be understood that the upper plastic 8 is sleeved on the outer periphery of the pole 6 and is fixedly connected with the first cover plate 7. The pole 6 is insulated from the first cover plate 7 by the upper plastic 8.

[0057] The first lower plastic 9 is connected with the first cover plate 7 and arranged at the side of the first cover plate 7 close to the cell body 1. The size of the first lower plastic 9 is substantially the same as the size of the first cover plate 7. The first lower plastic 9 is provided with a second installation hole 91 communicated with the containing hole 71, and the second part 62 of the pole 6 is further installed in the second installation hole 91. The first cover plate 7 is insulated from the cell body 1 by the first lower plastic 9.

[0058] The riveting block 13 is arranged on the side of the upper plastic 8 away from the first cover plate 7, and the riveting block 13 is provided with a third mounting hole 131 communicated with the accommodating hole 71, and the second part 62 of the pole 6 is also mounted in the third mounting hole 131. The riveting block 13 can be riveted with the pole 6 by laser welding.

[0059] The sealing ring 14 is sleeved on the second part 62 of the pole 6, and is used for sealing the accommodating hole 71, so that a closed space is formed in the shell 10.

[0060] The accommodating hole 71, the first mounting hole 81, the second mounting hole 91, the third mounting hole 131, the sealing ring 14 and the pole 6 are arranged on the same center line.

[0061] As shown in Figure 5 The second cover plate 11 assembly further includes an explosion-proof valve 12 and a second lower plastic 15.

[0062] Specifically, the second cover plate 11 is provided with an explosion-proof hole 111 and a liquid injection hole 112. The explosion-proof valve 12 is arranged in the explosion-proof hole 111 and is fixedly connected with the second cover plate. When the internal pressure of the battery monomer is too large, the explosion-proof valve 12 will automatically open to release pressure, so as to prevent explosion. Before the explosion-proof valve 12 is installed, electrolyte can be injected into the shell 10 through the explosion-proof hole 111 and the liquid injection hole 112, so as to realize the perfusion of the electrolyte. Compared with the prior art which uses only the liquid injection hole 112, the use of the explosion-proof hole 111 and the liquid injection hole 112 can increase the liquid injection area, and the size of the explosion-proof hole 111 is larger, so the injection speed of the electrolyte from the explosion-proof hole 111 is faster, thereby improving the liquid injection efficiency and improving the infiltration effect of the battery monomer body 1. After the liquid injection is completed, the explosion-proof valve 12 is installed on the second cover plate 11 to close the explosion-proof hole 111, so as to realize the closure of the inside of the battery monomer.

[0063] The second lower plastic 15 is fixedly connected with the second cover plate 11, and the second lower plastic 15 is a rectangular thin plate. The size of the second lower plastic 15 is substantially the same as that of the second cover plate 11. The second lower plastic 15 is provided with a protruding part 151 and a gas permeable hole 152, so that there is a gap between the second cover plate 11 and the battery monomer body 1, and the gas gathering effect of the explosion-proof valve 12 is improved. In addition, the high-pressure gas in the battery monomer can contact the explosion-proof valve 12 through the gas permeable hole 152, and generate a force on the explosion-proof valve 12, so that the explosion-proof valve 12 bursts at a preset pressure threshold, thereby improving the safety performance of the battery monomer.

[0064] The application further provides a battery pack comprising at least two battery monomers as described above, and the at least two battery monomers are connected in series and in parallel. The battery pack can be a battery module, a battery pack, or a battery cluster. All the battery monomers in the battery pack can be connected in series or in parallel. Of course, part of the battery monomers in the battery pack can be connected in series, and the other part can be connected in parallel, which is not particularly limited herein, and can be set as required.

[0065] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0066] The battery monomer and the battery pack provided by the embodiments of the application are described in detail above, and the principle and implementation manner of the application are described by applying specific examples. The above description of the embodiments is only used to help understand the technical solutions and the core idea of the application; those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some technical features can be replaced equivalently; and the modification or replacement does not make the essence of the corresponding technical solution deviate from the scope of the technical solutions of the embodiments of the application.

Claims

1. A battery cell, characterized by, The battery cell comprises: a cell body having two opposite end faces; a tab connected to the end face of the cell body, the tab having a transition portion and a connecting portion connected thereto; and an insulating sheet having a first insulating segment, a second insulating segment and a third insulating segment connected thereto, the first insulating segment being attached to the cell body, the second insulating segment covering the transition portion, and the third insulating segment being attached to the connecting portion.

2. The battery cell according to claim 1, wherein: the transition portion comprises a folding portion and a bending portion connected between the folding portion and the connecting portion; the second insulating segment comprises a first covering segment and a second covering segment connected between the first covering segment and the third insulating segment; wherein the first covering segment covers an outer surface of the folding portion, and the second covering segment covers an outer surface of the bending portion.

3. The battery cell according to claim 1, wherein: the first insulating segment is attached to the cell body via a first adhesive layer, and the third insulating segment is attached to the connecting portion via a second adhesive layer.

4. The battery cell according to claim 3, wherein: the connecting portion comprises an adhesive area and a post connecting area connected thereto, and the second adhesive layer is arranged on the adhesive area; the battery cell further comprises a post arranged on the post connecting area away from the cell body.

5. The battery cell of claim 4, wherein, The battery cell further comprises: a housing in which the cell body is arranged, the housing being provided with a first opening; a first cover plate connected to the housing and used for closing the first opening, the first cover plate being provided with a receiving hole; the post comprises a first portion and a second portion connected thereto, the first portion being arranged on the post connecting area, and the second portion being arranged in the receiving hole.

6. The battery cell of claim 5, wherein, The battery cell further comprises: an upper plastic arranged on a side of the first cover plate away from the cell body, the upper plastic being provided with a first mounting hole in communication with the receiving hole, and the second portion being further arranged in the first mounting hole.

7. The battery cell of claim 5, wherein the cathode comprises a lithium metal oxide. The battery cell further comprises: a first lower plastic connected to the first cover plate and arranged on a side of the first cover plate close to the cell body, the first lower plastic being provided with a second mounting hole in communication with the receiving hole, and the second portion being further arranged in the second mounting hole.

8. The battery cell according to claim 5, wherein: the housing is further provided with a second opening arranged opposite to the first opening; the battery cell further comprises: a second cover plate connected to the housing and used for closing the second opening, the first cover plate and the second cover plate being arranged at two ends of the housing respectively, the second cover plate being provided with an explosion-proof hole and a liquid injection hole; and an explosion-proof valve arranged in the explosion-proof hole.

9. The battery cell according to claim 3, wherein: a width of the first adhesive layer is greater than 2 mm; a width of the second adhesive layer is greater than 2 mm.

10. A battery pack characterized by comprising: The battery cell comprises at least two battery cells according to any one of claims 1 to 9, and the at least two battery cells are connected in series or in parallel.

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