Battery monomer and battery pack

Abstract

The utility model relates to the technical field of new energy batteries, and discloses a single battery and a battery pack, the single battery has a first direction, a second direction and a third direction which are intersected pairwise, and the single battery comprises a shell and a cover plate; the shell comprises a first side plate, a second side plate, a third side plate and a fourth side plate, the first side plate, the second side plate, the third side plate and the fourth side plate define a containing cavity, and the size of the third side plate is larger than that of the fourth side plate in the third direction; the shell further comprises a boss, the boss is arranged on the sides, close to the cover plate, of the first side plate and the second side plate, and the side, away from the cover plate, of the boss is provided with a first face. The cover plate comprises a plate body and a sliding table, the sliding table is further provided with a sliding groove extending in the first direction, the boss is in sliding connection with the sliding groove in the first direction, the sliding table is provided with a stopping face facing the plate body, and the first face is in stopping connection with the stopping face in the third direction. By increasing the welding area and the additional acting force provided by the boss, the risk that the cover plate is lifted away is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to new energy battery technical field especially relates to a battery monomer and battery package. BACKGROUND

[0002] Square aluminum battery is the common battery form in the present battery package, and it has the advantage of high group efficiency. The packaging of square aluminum battery adopts laser welding process, and the interface between the cover plate and the aluminum shell is welded by laser, so that the cover plate and the aluminum shell are welded into one body to avoid leakage of electrolyte in the aluminum shell.

[0003] An explosion-proof valve is arranged on the square aluminum battery to timely discharge high-pressure substances and achieve pressure relief when the battery triggers thermal runaway. The battery produces a large amount of gas instantaneously when it triggers thermal runaway, and after the explosion-proof valve is opened, it cannot achieve complete pressure relief. At this time, the un-discharged gas will gather at the top of the battery, causing the pressure at the top of the battery to be too high, and the cover plate will be lifted and flown, affecting the safety of the battery. SUMMARY

[0004] The utility model aims at: provide a kind of battery monomer, to solve the problem of the cover plate being lifted and flown in battery in prior art when thermal runaway;The utility model further provides a kind of battery package using the battery monomer.

[0005] To achieve the above purpose, the utility model provides a kind of battery monomer, the battery monomer has first direction, second direction and third direction that intersect each other, including shell and cover plate;

[0006] The shell includes first side plate, second side plate, third side plate and fourth side plate, the first side plate and the second side plate are oppositely arranged, the third side plate and the fourth side plate are oppositely arranged, the first side plate, the second side plate, the third side plate and the fourth side plate form an accommodating cavity, along the third direction, the size of the third side plate is greater than the size of the fourth side plate;

[0007] The shell further includes a boss, the side of the first side plate and the second side plate close to the cover plate is respectively provided with the boss, the boss extends along the first direction, and the side of the boss away from the cover plate has a first surface;

[0008] The cover plate covers and seals the accommodating cavity, and the cover plate includes a plate body and a sliding table, the sliding table is arranged on the side of the plate body facing the accommodating cavity, the sliding table is further provided with a sliding groove extending along the first direction, the boss and the sliding groove are slidably connected along the first direction, the sliding table has a stop surface facing the plate body, the first surface and the stop surface are stop connected along the third direction, and the plate body and the third side plate are stop connected along the first direction.

[0009] Preferably, the cover plate further comprises a blocking table, the blocking table is arranged on one side of the plate body facing the third side plate, one side of the third side plate facing the blocking table is provided with a blocking groove, and the blocking table is inserted into the blocking groove along the first direction.

[0010] Preferably, the blocking groove has a first section extending along the second direction and a second section extending along the first direction, both ends of the extension direction of the first section are connected with the second section, the blocking table comprises a first part extending along the second direction and a second part extending along the first direction, both ends of the extension direction of the first part are connected with the second part, the first section is arranged opposite to the first part, and the second section is arranged opposite to the second part.

[0011] Preferably, the cover plate further comprises a clamping table fixedly connected with the plate body, the clamping table is arranged on one side of the plate body facing the accommodating cavity, one side of the fourth side plate away from the third side plate is provided with a clamping groove, the clamping groove extends along the second direction, the clamping table is arranged opposite to the clamping groove along the first direction, and the clamping table is clamped into the clamping groove along the first direction.

[0012] Preferably, the clamping table comprises a fixed plate and a clamping plate connected with the fixed plate, the fixed plate is connected with the plate body, along the first direction, the clamping plate is arranged on one side of the fixed plate facing the fourth side plate, the clamping plate is clamped and matched with the clamping groove, and the fixed plate is attached to the fourth side plate.

[0013] Preferably, the boss further has a second face and a connecting face, the first face and the second face are arranged opposite to each other, the first face and the second face are perpendicular to the third direction respectively, the connecting face has two, the two connecting faces are perpendicular to the second direction respectively, and the first face, the second face and the two connecting faces form a rectangular structure.

[0014] Preferably, the boss further has a third face and a fourth face, the first face is perpendicular to the third direction, and the first face, the third face and the fourth face form a triangular structure.

[0015] Preferably, the boss further has a fifth face facing the plate body, the first face has two, the distance between the two first faces increases along the direction close to the fifth face, and the fifth face and the two first faces form a trapezoidal structure.

[0016] Preferably, the boss further has a sixth face towards the plate body and two inclined faces, the two inclined faces are connected between the sixth face and the first face, and the distance between the two inclined faces decreases along the direction close to the sixth face, and the first face, the sixth face and the two inclined faces form a trapezoidal structure.

[0017] The utility model further provides a battery pack, including the battery monomer of any prior art scheme.

[0018] The battery monomer and the battery pack have the beneficial effects that: the boss is arranged on one side of the first side plate and the second side plate of the shell close to the cover plate, the slide table is arranged on one side of the plate body close to the accommodating cavity, the boss and the slide groove in the slide table are connected in sliding mode along the first direction, the cover plate and the shell can be assembled in sliding mode along the first direction, the boss is embedded in the slide groove, the plate body is positioned after being connected with the third side plate, and subsequent welding operation is positioned; the slide groove and the boss are laser welded when the cover plate and the shell are assembled, welding area is increased, welding strength between the cover plate and the shell is increased, the first face of the boss and the stop face of the slide table are connected in stop mode along the third direction, the boss provides additional force to the cover plate when the cover plate is impacted by gas due to thermal runaway, the welding area is increased and the additional force provided by the boss is increased, and the risk that the cover plate is lifted is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a three-dimensional structural schematic view of the battery monomer of the utility model;

[0020] Figure 2 is Figure 1 a three-dimensional structural schematic view of the battery monomer from another perspective;

[0021] Figure 3 is Figure 1 a sectional view of the battery monomer;

[0022] Figure 4 is Figure 3 an enlarged structural schematic view of A of the battery monomer;

[0023] Figure 5 is a structural schematic view of the cover plate of the battery monomer of the utility model;

[0024] Figure 6 is Figure 5 an enlarged structural schematic view of B of the cover plate;

[0025] Figure 7 is a structural schematic view of the cover plate of the battery monomer from another perspective;

[0026] Figure 8 is a structure enlarged schematic view of C of the cover plate of Figure 7

[0027] Figure 9 is a front view of the cover plate of Figure 7

[0028] Figure 10 is a structure enlarged schematic view of E of the cover plate of Figure 9

[0029] Figure 11 is a sectional view of the cover plate of Figure 9

[0030] Figure 12 is a structure enlarged schematic view of D of the cover plate of Figure 11

[0031] Figure 13 is a structure schematic view of the shell of the battery monomer of the utility model;

[0032] Figure 14 is a structure enlarged schematic view of F of the shell of Figure 13

[0033] Figure 15 is a structure enlarged schematic view of G of the shell of Figure 13

[0034] Figure 16 is a structure schematic view of one embodiment of the shell of the battery monomer of the utility model;

[0035] Figure 17 is a structure schematic view of another embodiment of the shell of the battery monomer of the utility model;

[0036] Figure 18 is a structure schematic view of still another embodiment of the shell of the battery monomer of the utility model.

[0037] In the figure, 1, shell, 11, first side plate, 12, second side plate, 13, third side plate, 131, blocking groove, 1311, first section, 1312, second section, 14, fourth side plate, 141, clamping groove, 15, accommodating cavity, 16, boss, 161, first face, 162, second face, 163, third face, 164, fourth face, 165, fifth face, 166, sixth face, 167, inclined face, 168, connecting face, 2, cover plate, 21, plate body, 22, sliding table, 221, sliding groove, 222, blocking face, 23, blocking table, 231, first part, 232, second part, 24, clamping table, 241, fixed plate, 242, clamping plate, 3, guide inclined face, X, first direction, Y, second direction, Z, third direction. DETAILED DESCRIPTION​​​​​​​

[0038] The specific embodiments of the utility model will be further described in detail below in combination with the drawings and examples. The following examples are used to illustrate the utility model, but not to limit the scope of the utility model.

[0039] A preferred embodiment of the battery monomer of the utility model is shown in the figure, which has the first direction X, the second direction Y and the third direction Z intersecting with each other, and the battery monomer has a square structure, wherein the first direction X is the width direction of the battery monomer, the second direction Y is the thickness direction of the battery monomer, and the third direction Z is the height direction of the battery. Figures 1 to 18 The battery monomer comprises a shell 1 and a cover plate 2, and the cover plate 2 is capped above the shell 1. The shell 1 comprises a first side plate 11, a second side plate 12, a third side plate 13 and a fourth side plate 14, the first side plate 11 and the second side plate 12 are oppositely arranged, the third side plate 13 and the fourth side plate 14 are oppositely arranged, and the first side plate 11, the second side plate 12, the third side plate 13 and the fourth side plate 14 are connected through rounded corners and smoothly transitioned. The first side plate 11, the second side plate 12, the third side plate 13 and the fourth side plate 14 form an accommodating cavity 15, and the accommodating cavity 15 is used for assembling an electrode assembly. In the embodiment, the first side plate 11, the second side plate 12, the third side plate 13 and the fourth side plate 14 are all aluminum shell parts.

[0040] As shown in the figure, along the third direction Z, the size of the third side plate 13 is greater than that of the fourth side plate 14, and the end of the third side plate 13 close to the cover plate 2 is higher than that of the fourth side plate 14. In the embodiment, the heights of the first side plate 11, the second side plate 12 and the fourth side plate 14 are the same, that is, the top end of the third side plate 13 exceeds the top end of the first side plate 11, the second side plate 12 and the fourth side plate 14. When assembling the shell 1 and the cover plate 2, the third side plate 13 and the plate body 21 of the cover plate 2 are stopper matched along the first direction X, which can position the cover plate 2, and also can increase the contact area between the shell 1 and the cover plate 2, thereby increasing the welding area and ensuring the connection of the shell 1 and the cover plate 2.

[0041] Figure 14 The shell 1 further comprises a boss 16, and the boss 16 is arranged on the side of the first side plate 11 and the second side plate 12 close to the cover plate 2, that is, the top end of the first side plate 11 and the second side plate 12 is provided with the boss 16. The boss 16 extends along the first direction X, that is, the boss 16 extends along the width direction of the battery monomer. The boss 16 exceeds the first side plate 11 and the second side plate 12 along the second direction Y, and the side of the boss 16 away from the cover plate 2 has a first face 161, and the first face 161 is located on the part of the boss 16 exceeding the first side plate 11 and the second side plate 12, so as to be stopper connected with the cover plate 2 along the third direction Z.

[0042] The shell 1 further comprises a boss 16, and the boss 16 is arranged on the side of the first side plate 11 and the second side plate 12 close to the cover plate 2, that is, the top end of the first side plate 11 and the second side plate 12 is provided with the boss 16. The boss 16 extends along the first direction X, that is, the boss 16 extends along the width direction of the battery monomer. The boss 16 exceeds the first side plate 11 and the second side plate 12 along the second direction Y, and the side of the boss 16 away from the cover plate 2 has a first face 161, and the first face 161 is located on the part of the boss 16 exceeding the first side plate 11 and the second side plate 12, so as to be stopper connected with the cover plate 2 along the third direction Z.

[0043] ​The cover plate 2 covers the containing cavity 15 to avoid impurities from the outside entering the containing cavity 15, and also to avoid the electrolyte in the containing cavity 15 flowing out. The cover plate 2 comprises a plate body 21 and a sliding table 22, the sliding table 22 is arranged on the side of the plate body 21 facing the containing cavity 15, and the sliding table 22 is further provided with a sliding groove 221 extending along the first direction X, and the boss 16 is slidingly connected with the sliding groove 221 along the first direction X. The boss 16 and the sliding groove 221 have the same shape in the cross section perpendicular to the first direction X, so as to ensure the stability of the guiding movement of the boss 16 and the sliding groove 221, and also to increase the contact area and the welding area of the boss 16 and the sliding groove 221.

[0044] As shown in Figure 3 , Figure 11 and Figure 12 , when the cover plate 2 is assembled, the boss 16 is embedded in the sliding groove 221, and the cover plate 2 can be assembled with the shell 1 in a sliding manner along the first direction X by using the sliding connection relationship between the boss 16 and the sliding groove 221. In addition, the gap between the sliding groove 221 and the boss 16 is welded at the same time when the cover plate 2 and the shell 1 are welded, which increases the welding area, so as to increase the connection strength between the cover plate 2 and the shell 1.

[0045] The sliding table 22 further has a stop surface 222 facing the plate body 21, and the stop surface 222 is the inner wall surface of the sliding groove 221. After the cover plate 2 is assembled with the shell 1, the first surface 161 of the boss 16 is stop-connected with the stop surface 222 of the sliding table 22 along the third direction Z, that is, the boss 16 limits the movement of the sliding table 22 and the plate body 21 along the third direction Z by the first surface 161 and the stop surface 222. When the battery body is in thermal runaway, the boss 16 can provide additional force to the cover plate 2 along the third direction Z, which reduces the risk of the cover plate 2 being lifted off.

[0046] The battery monomer is provided with the boss 16 on the side of the first side plate 11 and the second side plate 12 of the shell 1 close to the cover plate 2, the plate body 21 is provided with the sliding table 22 on the side close to the containing cavity 15, the boss 16 is slidingly connected with the sliding groove 221 in the sliding table 22 along the first direction X, and the cover plate 2 can be assembled with the shell 1 in a sliding manner along the first direction X when the cover plate 2 is assembled with the shell 1. The boss 16 is embedded in the sliding groove 221, and the plate body 21 is positioned to the cover plate 2 after the stop connection with the third side plate 13, which is convenient for positioning the subsequent welding operation; at the same time, the sliding groove 221 and the boss 16 are subjected to laser welding when the cover plate 2 is assembled with the shell 1, which increases the welding area and further increases the welding strength between the cover plate 2 and the shell 1; in addition, the first surface 161 of the boss 16 is stop-connected with the stop surface 222 of the sliding table 22 along the third direction Z, and when the cover plate 2 is impacted by the gas after thermal runaway, the boss 16 provides additional force to the cover plate 2 along the third direction Z, which reduces the risk of the cover plate 2 being lifted off by increasing the welding area and the additional force provided by the boss 16.

[0047] Preferably, the cover plate 2 further comprises a stop table 23, the stop table 23 is arranged on the side of the plate body 21 facing the third side plate 13, the side of the third side plate 13 facing the stop table 23 is provided with a stop groove 131, and the stop table 23 is inserted into the stop groove 131 along the first direction X.

[0048] As shown in the drawings, Figure 7 With Figure 8 In the present embodiment, the stop groove 131 is arranged on the part of the third side plate 13 beyond the fourth side plate 14. When the cover plate 2 is assembled with the shell 1 along the first direction X, the stop table 23 will be embedded in the stop groove 131 of the third side plate 13, and the stop table 23 and the stop groove 131 are in stop cooperation along the third direction Z. The third side plate 13 can apply additional force to the plate body 21 along the third direction Z through the stop groove 131 and the stop table 23. In addition, the stop groove 131 and the stop table 23 are assembled by welding, which increases the welding area and avoids the cover plate 2 from being lifted off.

[0049] Preferably, the stop groove 131 has a first section 1311 extending along the second direction Y and a second section 1312 extending along the first direction X, both ends of the extension direction of the first section 1311 are connected with the second section 1312, and the stop table 23 comprises a first part 231 extending along the second direction Y and a second part 232 extending along the first direction X, both ends of the extension direction of the first part 231 are connected with the second part 232, the first section 1311 is arranged opposite to the first part 231, and the second section 1312 is arranged opposite to the second part 232.

[0050] As shown in the drawings, Figure 13 With Figure 14 In the present embodiment, the second section 1312 penetrates the third side plate 13 at the end facing the fourth side plate 14, and the length of the stop groove 131 is increased as much as possible in the direction perpendicular to the third direction Z. The second part 232 and the second section 1312 are arranged opposite to each other, which also increases the length of the stop table 23, and further increases the welding area of the stop groove 131 and the stop table 23, and further increases the welding strength of the cover plate 2 and the shell 1.

[0051] Preferably, the cover plate 2 further comprises a clamping table 24 fixedly connected with the plate body 21, the clamping table 24 is arranged on the side of the plate body 21 facing the accommodating cavity 15, and the fourth side plate 14 away from the third side plate 13 is provided with a clamping groove 141 extending along the second direction Y. The clamping table 24 and the clamping groove 141 are arranged opposite to each other along the first direction X, and the clamping table 24 is clamped into the clamping groove 141 along the first direction X.

[0052] As shown in the drawings, Figure 9 , Figure 10 , Figure 13 With Figure 15As shown, a locking platform 24 is provided on the side of the plate body 21 facing the receiving cavity 15, and a locking groove 141 is provided on the side of the fourth side plate 14 away from the third side plate 13. When the cover plate 2 and the outer shell 1 are slidably assembled along the first direction X, the locking platform 24 can be locked in the locking groove 141 along the first direction X. The locking groove 141 extends along the first direction X, increasing the length of the locking groove 141. After the locking platform 24 and the locking groove 141 are assembled, their connection position is welded, which can increase the welding area between the cover plate 2 and the outer shell 1. At the same time, the fourth side plate 14 can apply a force to the cover plate 2 along the third direction Z through the locking groove 141 and the locking platform 24, which can improve the problem of the cover plate 2 being blown off in the event of thermal runaway.

[0053] Preferably, the card holder 24 includes a fixing plate 241 and a snap-fit ​​plate 242 connected to the fixing plate 241. The fixing plate 241 is connected to the plate body 21. Along the first direction X, the snap-fit ​​plate 242 is disposed on the side of the fixing plate 241 facing the fourth side plate 14. The snap-fit ​​plate 242 is engaged with the card slot 141, and the fixing plate 241 is in contact with the fourth side plate 14.

[0054] like Figure 6 , Figure 9 , Figure 10 As shown, the mounting plate 24 is formed by a fixing plate 241 and a snap-fit ​​plate 242. The snap-fit ​​plate 242 is located on the side of the fixing plate 241 facing the fourth side plate 14 along the first direction X. When the cover plate 2 and the outer shell 1 are slidably assembled, the snap-fit ​​plate 242 is embedded in the slot 141, and the fixing plate 241 is attached to the side of the fourth side plate 14 away from the third side plate 13. Through the setting of the fixing plate 241 and the snap-fit ​​plate 242, the connection between the snap-fit ​​plate 242 and the slot 141, and between the fixing plate 241 and the fourth side plate 14, are welded and fixed, further increasing the welding area to increase the welding strength between the cover plate 2 and the outer shell 1.

[0055] Preferably, along the first direction X, the boss 16 is provided with a guide slope 3 at one end near the third side plate 13 and the fourth side plate 14, and the slide 22 is provided with a guide slope 3 at one end near the third side plate 13 and the fourth side plate 14, respectively.

[0056] like Figure 6 , Figure 8 and Figure 10 As shown, guide slopes 3 are provided at both ends of the boss 16 along the first direction X and at both ends of the slide 22 along the first direction X. The guide slopes 3 on the boss 16 have a guiding function, which makes the two ends of the boss 16 slide more smoothly when it is inserted into the slide groove 221, and makes the two ends of the slide 22 cooperate more smoothly with the third side plate 13 and the fourth side plate 14, thereby increasing the adaptability of the structure. In this embodiment, the guide slopes 3 are provided on the end faces of the boss 16 and the slide 22 that are perpendicular to the second direction Y.

[0057] Preferably, the boss 16 also has a second surface 162 and a connecting surface 168. The first surface 161 and the second surface 162 are arranged opposite to each other. The first surface 161 and the second surface 162 are perpendicular to the third direction Z. There are two connecting surfaces 168, which are perpendicular to the second direction Y. The first surface 161, the second surface 162 and the two connecting surfaces 168 form a rectangular structure.

[0058] like Figure 4 As shown, in this embodiment, the two connecting surfaces 168 are arranged opposite to each other. The first surface 161, the second surface 162 of the boss 16 and the two connecting surfaces 168 enclose a rectangular structure, so that a T-shaped step structure is formed between the boss 16 and the first side plate 11 and the second side plate 12. The processing is simple, and the rectangular surface area is larger, the welding area is larger, and the welding strength is higher.

[0059] Preferably, the boss 16 also has a third surface 163 and a fourth surface 164, the first surface 161 is perpendicular to the third direction Z, and the first surface 161, the third surface 163 and the fourth surface 164 form a triangular structure.

[0060] like Figure 16 As shown, the first surface 161, the third surface 163, and the fourth surface 164 of the boss 16 form a triangular structure. The triangle has stability and can increase the mechanical stability of the boss 16. When the battery thermally runs away, the boss 16 can withstand greater deformation forces.

[0061] Preferably, the boss 16 also has a fifth surface 165 facing the plate body 21, and there are two first surfaces 161. The distance between the two first surfaces 161 increases in the direction close to the fifth surface 165, and the fifth surface 165 and the two first surfaces 161 form a trapezoidal structure.

[0062] like Figure 17 As shown, the fifth surface 165 and the two first surfaces 161 form a trapezoidal structure. When the battery thermally runs away, the force exerted by the first surface 161 is inclined, which can increase the mechanical stability of the boss 16. In addition, the trapezoidal structure has a large surface area, which can increase the welding area between the cover plate 2 and the outer shell 1, thereby allowing it to withstand greater deformation forces.

[0063] Preferably, the boss 16 also has a sixth surface 166 facing the plate body 21 and an inclined surface 167. There are two inclined surfaces 167, which are connected between the sixth surface 166 and the first surface 161. The distance between the two inclined surfaces 167 decreases in the direction closer to the sixth surface 166. The first surface 161, the sixth surface 166 and the two inclined surfaces 167 form a trapezoidal structure.

[0064] like Figure 18As shown, when the first face 161, the sixth face 166 and the two inclined faces 167 form a trapezoidal structure, the trapezoidal structure is in a normal form, the top size of the trapezoidal structure is smaller than the bottom size, and the inclined faces 167 can increase the stability of the boss 16, in addition, the surface area of the trapezoidal structure is large, and the welding area between the cover plate 2 and the shell 1 can be increased, so that a greater deformation force can be borne.

[0065] The preferred embodiment of the battery pack of the utility model, including battery monomer, the specific structure of battery monomer is same with the specific structure of battery monomer in any embodiment above, this does not repeat here.

[0066] In summary, the utility model embodiment provides a kind of battery monomer and battery pack, it is arranged boss in the first side plate and the second side plate of shell close to the side of cover plate, the side of plate body close to accommodating cavity is arranged sliding table, the sliding groove in the sliding table of boss and sliding table is slidably connected along first direction, cover plate and shell can be assembled in the way of sliding along first direction when assembling, boss is embedded in sliding groove, plate body is positioned after being connected with third side plate stop, it is convenient for subsequent welding operation positioning;While sliding groove, boss is in cover plate and shell assembly, and laser welding is carried out, welding area is increased, and then the welding strength between cover plate and shell is increased;In addition, the first face of boss and the stop surface of sliding table are connected along third direction stop, when gas impact cover plate occurs thermal runaway, boss provides additional force to cover plate, by increasing welding area and the additional force provided by boss, the risk of cover plate being lifted is reduced.

[0067] The above is only preferred embodiment of the utility model, it should be pointed out, for ordinary skilled person in the art, without departing from the technical principle of the utility model, can make several improvements and substitutions under the premise, these improvements and substitutions also should be regarded as the protection range of the utility model.

Claims

1. A battery cell having a first direction, a second direction, and a third direction that each intersect with one another, characterized by, The shell and the cover plate are included. The shell includes a first side plate, a second side plate, a third side plate and a fourth side plate, the first side plate and the second side plate are oppositely arranged, the third side plate and the fourth side plate are oppositely arranged, and the first side plate, the second side plate, the third side plate and the fourth side plate form an accommodating cavity. The shell further includes a boss, the first side plate and the second side plate are respectively provided with the boss near the cover plate, the boss extends along the first direction, and a side of the boss away from the cover plate is provided with a first surface. The cover plate covers the accommodating cavity, and the cover plate includes a plate body and a sliding table, the sliding table is arranged on a side of the plate body facing the accommodating cavity, the sliding table is further provided with a sliding groove extending along the first direction, the boss and the sliding groove are slidably connected along the first direction, the sliding table is provided with a stop surface facing the plate body, the first surface and the stop surface are stop connected along the third direction, and the plate body and the third side plate are stop connected along the first direction.

2. The battery cell of claim 1, wherein, The cover plate further includes a blocking table, the blocking table is arranged on a side of the plate body facing the third side plate, and a side of the third side plate facing the blocking table is provided with a blocking groove, and the blocking table is inserted into the blocking groove along the first direction.

3. The battery cell of claim 2, wherein, The blocking groove has a first section extending along the second direction and a second section extending along the first direction, both ends of the extension direction of the first section are connected with the second section, the blocking table includes a first part extending along the second direction and a second part extending along the first direction, both ends of the extension direction of the first part are connected with the second part, the first section and the first part are oppositely arranged, and the second section and the second part are oppositely arranged.

4. The battery cell according to any one of claims 1 to 3, characterized in that, The cover plate further includes a clamping table fixedly connected with the plate body, the clamping table is arranged on a side of the plate body facing the accommodating cavity, a side of the fourth side plate away from the third side plate is provided with a clamping groove, the clamping groove extends along the second direction, the clamping table and the clamping groove are oppositely arranged along the first direction, and the clamping table is clamped in the clamping groove along the first direction.

5. The battery cell of claim 4, wherein, The clamping table includes a fixed plate and a clamping plate connected with the fixed plate, the fixed plate is connected with the plate body, along the first direction, the clamping plate is arranged on a side of the fixed plate facing the fourth side plate, the clamping plate is clamped in the clamping groove, and the fixed plate is attached to the fourth side plate.

6. The battery cell of any one of claims 1-3, wherein, The boss further has a second surface and a connecting surface, the first surface and the second surface are oppositely arranged, the first surface and the second surface are respectively perpendicular to the third direction, the connecting surface has two, the two connecting surfaces are respectively perpendicular to the second direction, and the first surface, the second surface and the two connecting surfaces form a rectangular structure.

7. The battery cell of any one of claims 1-3, wherein, The boss further has a third surface and a fourth surface, the first surface is perpendicular to the third direction, and the first surface, the third surface and the fourth surface form a triangular structure.

8. The battery cell of any one of claims 1-3, wherein, The boss further has a fifth surface facing the plate body, the first surface has two, the distance between the two first surfaces increases along the direction close to the fifth surface, and the fifth surface and the two first surfaces form a trapezoidal structure.

9. The battery cell of any one of claims 1-3, wherein, The boss further has a sixth surface facing the plate body and two inclined surfaces, the two inclined surfaces are connected between the sixth surface and the first surface, the distance between the two inclined surfaces decreases along the direction close to the sixth surface, and the first surface, the sixth surface and the two inclined surfaces form a trapezoidal structure.

10. A battery pack, characterized by, A battery cell comprising any one of claims 1-9.

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