CN219801213U

CN219801213U - Electric connection assembly, top cover and battery

Info

Publication number: CN219801213U
Application number: CN202321165641.3U
Authority: CN
Inventors: 林法稳; 房森基; 黄婷; 李勇军; 陈圣立
Original assignee: Jiangsu Zenio New Energy Battery Technologies Co Ltd
Current assignee: Jiangsu Zenio New Energy Battery Technologies Co Ltd
Priority date: 2023-05-15
Filing date: 2023-05-15
Publication date: 2023-10-03
Anticipated expiration: 2033-05-15

Abstract

The utility model discloses an electric connection assembly, a top cover and a battery, wherein the electric connection assembly comprises a switching sheet, a convex part is convexly arranged on the switching sheet along a first direction, a containing groove is formed in the convex part along the first direction, and a sealing sheet is hermetically connected with a notch of the containing groove; the accommodating groove is provided with a flame retardant and a piercing member; when the battery is in thermal runaway, the pressure in the battery is increased due to the high temperature in the battery, and the pressure acts on the sealing piece along the first direction, so that the sealing piece moves along the first direction, and at the moment, the puncture piece is in contact with the sealing piece, the sealing piece is broken, and the flame retardant is released into the internal space of the battery cell; so that the flame retardant can be released into the oxygen-containing environment before the combustible gas, and further contact between the combustible gas and oxygen is blocked; meanwhile, the flame retardant agent is further vaporized in a high-temperature environment to take away a large amount of heat, so that the temperature of the battery is rapidly reduced, and the thermal runaway of surrounding batteries is avoided; and by the arrangement, the flame retardant is not required to be directly added into the electrolyte.

Description

Electric connection assembly, top cover and battery

Technical Field

The utility model relates to the technical field of battery structures, in particular to an electric connection assembly, a top cover and a battery.

Background

Nowadays, a new energy automobile is used as a rising transportation tool, is more environment-friendly compared with a traditional fuel automobile, and has the advantage of low carbon; however, when the accident of spontaneous combustion of the new energy automobile occurs, certain potential safety hazard exists, so that consumers have worry about the safety of the new energy automobile; among them, the safety of the new energy automobile mainly depends on its power battery, so those skilled in the art have made many improvements to the safety performance of the power battery.

At present, the industry generally adds a flame retardant to electrolyte in a power battery, and the flame retardant can effectively prevent the spontaneous combustion of the power battery, but can cause adverse effects on the performance of the power battery, so that the capacity decay period of the power battery is accelerated, the output power is reduced, the low-temperature performance is deteriorated, and the like.

Disclosure of Invention

The utility model aims to provide an electric connection assembly, a top cover and a battery, which are used for solving the technical problem that the performance of the current power battery is reduced due to the fact that flame retardant is directly added.

To achieve the purpose, the utility model adopts the following technical scheme:

an electric connection assembly comprises a switching sheet, wherein a protruding part is arranged on the switching sheet in a protruding mode along a first direction, a containing groove is formed in the protruding part along the first direction, and a sealing sheet is connected to a notch of the containing groove in a sealing mode;

wherein, the containing groove is provided with a flame retardant and a piercing member; the puncture piece is used for enabling the sealing piece to be broken when the sealing piece moves along the first direction, so that the flame retardant is released.

Optionally, the lancing element comprises a lancing carriage, the lancing carriage being connected to the groove wall of the receiving groove;

the puncture support is provided with a puncture part in a protruding mode along the direction opposite to the first direction, and the puncture part is used for puncturing the sealing piece.

Optionally, the end part of the puncture bracket, which is arranged towards the groove wall of the accommodating groove, is convexly provided with a supporting extension part along the opposite direction of the first direction, and the height of the supporting extension part is larger than that of the puncture part;

the notch edge of the accommodating groove is provided with a bracket mounting groove, and the end part of the puncture bracket and the supporting extension part are embedded in the bracket mounting groove.

Optionally, the number of the support extensions is plural and distributed circumferentially around the puncture at equal intervals.

Optionally, a sealing installation groove is formed at the edge of the notch of the accommodating groove and corresponds to the sealing piece, and the sealing piece is embedded in the sealing installation groove;

wherein the seal mounting groove and the bracket mounting groove are arranged along the first direction.

Optionally, the flame retardant is a fluorocarbon or ketone.

A top cover comprising a top cover body on which an electrical connection assembly as described above is mounted;

the top cover body is provided with a first avoidance opening corresponding to the position of the protruding portion, the switching piece is arranged on one side of the top cover body, and the protruding portion penetrates through the first avoidance opening and is located on the other side of the top cover body.

Optionally, a sleeve is arranged between the first avoidance port and the protruding part; the sleeve is sleeved outside the protruding part, a bottom side step part and an injection molding groove are formed on the outer wall of the sleeve, and the bottom side step part protrudes out of the injection molding groove;

the sealing ring is sleeved between the bottom side step part and the first avoidance port, an injection molding part is formed in the injection molding groove in an injection molding mode, and the injection molding part is respectively connected with the sleeve and the adapter piece.

Optionally, a top step part is further formed on the outer wall of the sleeve, and the top step part is arranged on one side of the injection molding groove away from the bottom step part and protrudes out of the injection molding groove;

the injection molded portion extends in the first direction until the injection molded portion is aligned with the topside stepped portion.

A battery comprises a shell, wherein a mounting groove is formed in the shell, an electric core is arranged in the mounting groove, and a top cover is arranged at the notch of the mounting groove.

Compared with the prior art, the utility model has the following beneficial effects:

when the battery is in thermal runaway, namely the explosion-proof valve on the battery is opened, the high temperature in the battery causes the pressure in the battery to rise, the pressure acts on the sealing plate along the first direction, so that the sealing plate moves along the first direction, the puncture member contacts with the sealing plate at the moment, the sealing plate is broken, and the flame retardant is released into the internal space of the battery; meanwhile, when the explosion-proof valve is opened, the containing groove is used as a part of the polar column, and the polar column is arranged on the top cover and is obviously higher than the electric core in the battery, so that the flame retardant can be firstly contacted with oxygen, and the flame retardant can be released into an oxygen-containing external environment through the opened explosion-proof valve before the combustible gas from the electric core passes through the open explosion-proof valve, and further contact between the combustible gas and the oxygen is blocked; meanwhile, the flame retardant agent is further vaporized in a high-temperature environment to take away a large amount of heat, so that the temperature of the battery is rapidly reduced, and the thermal runaway of surrounding batteries is avoided; and through the arrangement, the flame retardant is not required to be directly added into the electrolyte, so that the performance of the battery is not affected.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the utility model, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.

The structures, proportions, sizes, etc. shown in the drawings are shown only in connection with the present disclosure, and are not intended to limit the scope of the utility model, since any modification, variation in proportions, or adjustment of the size, etc. of the structures, proportions, etc. should be considered as falling within the spirit and scope of the utility model, without affecting the effect or achievement of the objective.

Fig. 1 is a schematic diagram of an overall structure of an electrical connection assembly according to an embodiment of the present utility model;

FIG. 2 is a schematic diagram of an exploded view of an electrical connection assembly according to an embodiment of the present utility model;

FIG. 3 is a schematic view of the overall structure of a top cover according to an embodiment of the present utility model;

FIG. 4 is a schematic view of an explosion structure of a top cover according to an embodiment of the present utility model;

fig. 5 is a schematic view of a first cross-sectional structure of a top cover according to an embodiment of the present utility model;

FIG. 6 is a schematic view of a second cross-sectional structure of a top cover according to an embodiment of the present utility model;

FIG. 7 is a schematic view of the overall structure of a lancing member according to an embodiment of the present utility model;

fig. 8 is a schematic overall structure of an injection molding part according to an embodiment of the utility model.

Illustration of: 1. a transfer sheet; 101. a boss; 102. a receiving groove; 103. a bracket mounting groove; 104. sealing the mounting groove; 105. a first outer step portion; 106. a second outer step portion;

2. a piercing member; 201. a puncturing portion; 202. puncturing the stent; 203. a support extension;

3. a sealing sheet;

4. a top cover body; 401. a first avoidance port;

5. a sleeve; 501. a bottom side step portion; 502. an injection molding groove; 503. a top side step portion; 504. a first inner step portion; 505. a second inner step portion; 506. an extension;

6. a seal ring; 7. injection molding part.

Detailed Description

In order to make the objects, features and advantages of the present utility model more comprehensible, the technical solutions in the embodiments of the present utility model are described in detail below with reference to the accompanying drawings, and it is apparent that the embodiments described below are only some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "top", "bottom", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model. It is noted that when one component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present.

The technical scheme of the utility model is further described below by the specific embodiments with reference to the accompanying drawings.

Referring to fig. 1 to 8, fig. 1 is a schematic overall structure of an electrical connection assembly according to an embodiment of the present utility model, fig. 2 is a schematic explosion structure of an electrical connection assembly according to an embodiment of the present utility model, fig. 3 is a schematic overall structure of a top cover according to an embodiment of the present utility model, fig. 4 is a schematic explosion structure of a top cover according to an embodiment of the present utility model, fig. 5 is a schematic first cross-sectional structure of a top cover according to an embodiment of the present utility model, fig. 6 is a schematic second cross-sectional structure of a top cover according to an embodiment of the present utility model, fig. 7 is a schematic overall structure of a piercing member according to an embodiment of the present utility model, and fig. 8 is a schematic overall structure of an injection molding part according to an embodiment of the present utility model.

Example 1

The electric connection assembly that this embodiment provided is mainly applied to the top cap of energy storage battery, and it plays the effect of electricity connection outside and the electric core in the energy storage battery, optimizes through the utmost point post structure simultaneously, makes it possess fire-retardant ability to it can be understood that fire-retardant structure sets up in the utmost point post structure, can save energy storage battery's inner space, makes energy storage battery's energy density improve, and the electric connection assembly of this embodiment possesses the advantage that the security is high and small promptly.

As shown in fig. 1 and 2, the electrical connection assembly of the present embodiment includes a switching piece 1, the switching piece 1 is provided with a protruding portion 101 protruding along a first direction, the protruding portion 101 is provided with a receiving groove 102 along the first direction, and a notch of the receiving groove 102 is connected with a sealing piece 3 in a sealing manner; the protruding part 101 corresponds to a pole body, and protrudes out of the top cover, so that the battery can be electrically connected with the protruding part; the sealing piece 3 can be connected to the notch of the accommodating groove 102 in a sealing way by laser welding; wherein, the holding groove 102 is provided with a flame retardant and a piercing member 2; the piercing member 2 is used to break the sealing sheet 3 and release the flame retardant when the sealing sheet 3 moves in the first direction.

Specifically, when thermal runaway occurs in the battery, i.e., when the explosion-proof valve on the battery is opened, the pressure in the battery is raised by the high temperature occurring in the battery, and the pressure acts on the sealing sheet 3 in the first direction, so that the sealing sheet 3 moves in the first direction, and at this time, the puncture member 2 contacts with the sealing sheet 3, and the sealing sheet 3 breaks, so that the flame retardant is released into the internal space of the battery cell; meanwhile, when the explosion-proof valve is opened, as the accommodating groove 102 is used as a part of the polar column, the polar column is arranged on the top cover and is obviously higher than the battery core in the battery, the flame retardant can be firstly contacted with oxygen, so that the flame retardant can be released into an oxygen-containing external environment through the opened explosion-proof valve before the combustible gas from the battery core passes through the explosion-proof valve, and further contact between the combustible gas and the oxygen is blocked; meanwhile, the flame retardant agent is further vaporized in a high-temperature environment to take away a large amount of heat, so that the temperature of the battery is rapidly reduced, and the thermal runaway of surrounding batteries is avoided; and through the arrangement, the flame retardant is not required to be directly added into the electrolyte, so that the performance of the battery is not affected.

Further, as shown in fig. 2, 5-7, lancing element 2 includes lancing carriage 202, lancing carriage 202 being connected to the groove wall of receiving groove 102; the lancing bracket 202 is convexly provided with a lancing portion 201 in the opposite direction of the first direction, the lancing portion 201 being used to lance the sealing sheet 3. Wherein the piercing portion 201 is tapered to be able to apply a force to a local area of the sealing sheet 3 when the sealing sheet 3 is moved in the first direction, so that the sealing sheet 3 is pierced; meanwhile, the number of the piercing portions 201 is not limited, and in this embodiment, one piercing portion 201 is selected.

In a specific embodiment, as shown in fig. 5 and 7, the end of the lancing bracket 202 disposed toward the groove wall of the receiving groove 102 is convexly provided with a supporting extension 203 in the opposite direction of the first direction, and the height of the supporting extension 203 is greater than the height of the lancing portion 201; a bracket mounting groove 103 is formed at the edge of the notch of the accommodating groove 102, and the end part of the puncture bracket 202 and the supporting extension part 203 are embedded in the bracket mounting groove 103. Namely, the piercing member 2 is arranged in the accommodating groove 102 in an assembled mode, and meanwhile, the piercing member 2 is limited by utilizing the sealing sheet 3 welded on the accommodating groove 102, so that the device has the advantages of convenience in processing, simplicity in assembly and the like; meanwhile, since the height of the supporting extension 203 is greater than that of the puncture 201, the puncture 201 is ensured not to contact with the sealing sheet 3 under normal conditions, and the flame retardant is prevented from being erroneously released, which has an advantage of high reliability. In other alternative embodiments, the lancing support 202 can be mounted in the housing 102 in other forms of encapsulation, welding, etc.

On the basis of the above embodiment, as shown in fig. 7, the number of the supporting extensions 203 is plural, and is equally circumferentially distributed around the puncture 201. In this embodiment, the number of the supporting extension parts 203 is four, and the supporting extension parts are distributed at 90 ° intervals, which is equivalent to a cross shape, and the four bracket mounting grooves 103 are equally arranged, so that the puncture member 2 can be stably mounted in the accommodating groove 102 without affecting the release of the flame retardant; in other alternative embodiments, the number of support extensions 203 may be two and distributed 180 ° apart, with the bracket mounting slots 103 likewise provided with two, which enables the release of flame retardant at the fastest rate.

Further, as shown in fig. 5, a sealing installation groove 104 is formed at the edge of the notch of the accommodating groove 102 and corresponds to the position of the sealing sheet 3, and the sealing sheet 3 is embedded in the sealing installation groove 104; wherein the seal mounting groove 104 and the bracket mounting groove 103 are provided along the first direction. It will be appreciated that the provision of the seal mounting groove 104 enables the sealing plate 3 to be positioned quickly on the adapter plate 1, providing positioning for the sealing plate 3, facilitating laser welding of the sealing plate 3 to the notch of the receiving groove 102.

On the basis of the embodiment, the flame retardant is fluorine-containing hydrocarbon or ketone, the boiling point of the flame retardant is less than or equal to 80 ℃, and the flame retardant is heat-absorbing and nonflammable liquid.

In summary, the electrical connection assembly provided in this embodiment has the advantages of being easy to process, easy to assemble, small in size, and the like, while having a flame retardant function, without affecting the performance of the battery.

Example two

As shown in fig. 3 to 8, the top cover provided in this embodiment includes a top cover body 4, and an electrical connection assembly in the first embodiment is mounted on the top cover body 4; the first embodiment describes a specific structure and technical effects concerning the electrical connection assembly, and the top cover of the present embodiment refers to the structure and has the technical effects as well; meanwhile, a first avoidance port 401 is formed in the position, corresponding to the protruding portion 101, of the top cover body 4, the switching piece 1 is arranged on one side of the top cover body 4, and the protruding portion 101 penetrates through the first avoidance port 401 and is located on the other side of the top cover body 4; additionally, a lower plastic structure is also arranged below the top cover body 4.

On the basis of the above embodiment, the sleeve 5 is provided between the first escape opening 401 and the boss 101; the sleeve 5 is sleeved outside the protruding part 101; wherein, the assembly of top cap is as follows: firstly, combining the top cover body 4 with the sleeve 5, then injection molding an injection molding part 7 on the top cover body 4, enabling the injection molding part 7 to connect the top cover body 4 with the sleeve 5, and then sleeving the switching piece 1 of the electric connection assembly in the sleeve 5 through welding; the temperature of the injection molding part 7 is required to reach 300 ℃ during molding, and the diaphragm closed-pore temperature of the battery cell is usually lower than the temperature, and the top cover and the battery cell are mutually independent at the moment, so that the injection molding temperature does not influence the diaphragm; therefore, through the arrangement of the sleeve 5, the problem that the cell membrane closed hole is invalid due to welding the switching piece 1 and the cell in the conventional technology is avoided, namely, the cell membrane is prevented from being invalid due to injection molding. And, the lower extreme of injection molding 7 is laminated with the upside of top cap body 4, and the lower extreme of sleeve pipe 5 outwards extends, forms an extension 506, and extension 506 is located the downside of top cap body 4, and orthographic projection face is on the downside of top cap body 4 to form the interlock and combine, guaranteed not only the leakproofness but also guaranteed the connection stability between injection molding 7, adapter 1 and sleeve pipe 5.

The outer wall of the sleeve 5 is formed with a bottom step part 501 and an injection molding groove 502 which are arranged along the first direction, and the bottom step part 501 protrudes from the injection molding groove 502; a sealing ring 6 is sleeved between the bottom side step part 501 and the first avoiding opening 401, an injection molding part 7 is formed in the injection molding groove 502 in an injection molding mode, the injection molding part 7 is respectively connected with the sleeve 5 and the switching piece 1, and the injection molding part 7 adopts PPS injection molding; wherein the injection molding groove 502 is provided such that the injection molding part 7 can be partially embedded therein to improve the air tightness and connection tightness between the injection molding part 7, the switching piece 1 and the sleeve 5. It can be understood that the sealing between the electrical connection assembly and the top cover body 4 can be improved by the arrangement of the sealing ring 6 and the injection molding part 7, so that the sealing inside the battery is ensured. Simultaneously, sleeve 5 is located on top cap body 4 through first mouthful 401 cover of dodging, makes bellying 101 pass sleeve 5, makes the utmost point post pass sleeve 5 promptly, and bellying 101 protrusion is used for being connected with the outside electricity of battery in the one end of sleeve 5 for top cap simple structure, convenient to use, production efficiency is high moreover, low in production cost to can assist the lightweight that realizes the battery, and can reduce the cost of manufacture of battery.

Further, as shown in fig. 5 and 7, a top step portion 503 is further formed on the outer wall of the sleeve 5, and the top step portion 503 is disposed on a side of the injection molding groove 502 away from the bottom step portion 501 and protrudes from the injection molding groove 502; the injection molded part 7 extends in the first direction until the injection molded part 7 is aligned with the top side step 503. Wherein, through the setting of topside step portion 503, play the anti-overflow's of moulding plastics effect, avoid moulding plastics portion 7 to spill over to lead to the too big profile of moulding plastics portion 7.

Additionally, as shown in fig. 5, the inner wall of the sleeve 5 is sequentially provided with a second inner step portion 505 and a first inner step portion 504 along the first direction, wherein the first inner step portion 504 protrudes from the second inner step portion 505, and the first inner step portion 504 can be mutually overlapped and matched with the protruding portion 101 so as to facilitate welding; while the boss 101 is formed with a first outer step 105 corresponding to the first inner step 504, and a second outer step 106 corresponding to the second inner step 505, wherein the second outer step 106 protrudes from the first outer step 105; the first inner step portion 504 and the first outer step portion 105 are fixed and sealed by laser welding, the second inner step portion 505 and the second outer step portion 106 are in a bonding limiting mode, and the outline of the second inner step portion 505 is in a bell-mouth shape and slightly larger than the outline of the second outer step portion 106; on the one hand, the second inner step part 505 is bonded with the second outer step part 106 to limit, so that the assembly between the electric connection assembly and the top cover is more convenient, and on the other hand, the first inner step part 504 and the first outer step part 105 are connected through laser welding, so that the tightness between the electric connection assembly and the top cover is ensured.

In summary, the top cover provided in this embodiment has the flame retardant function, does not affect the performance of the battery, and has the advantages of easy processing, easy assembly, small volume and the like.

Example III

The battery provided by the embodiment comprises a shell, wherein a mounting groove is formed in the shell, a battery core is arranged in the mounting groove, and a top cover in the second embodiment is arranged at a notch of the mounting groove. Wherein, the electric connection assembly on the top cover is electrically connected with the electric core. In the second embodiment, a specific structure and technical effects concerning the top cover are described, and the battery of the present embodiment refers to the structure and has the technical effects as well

In summary, the embodiment has the advantages of high safety, stable performance, easy processing, easy assembly, small volume and the like.

The above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. The electric connection assembly is characterized by comprising a switching piece (1), wherein a protruding part (101) is protruding from the switching piece (1) along a first direction, a containing groove (102) is formed in the protruding part (101) along the first direction, and a sealing piece (3) is connected with a notch of the containing groove (102) in a sealing way;

wherein, the containing groove (102) is provided with a flame retardant and a piercing member (2); the puncture member (2) is configured to break the sealing sheet (3) when the sealing sheet (3) moves in the first direction, thereby releasing the flame retardant.

2. An electrical connection assembly according to claim 1, wherein the lancing element (2) comprises a lancing carriage (202), the lancing carriage (202) being connected to the groove wall of the receiving groove (102);

the puncture bracket (202) is convexly provided with a puncture part (201) along the direction opposite to the first direction, and the puncture part (201) is used for puncturing the sealing sheet (3).

3. An electrical connection assembly according to claim 2, wherein the end of the lancing carriage (202) disposed towards the wall of the receiving slot (102) is provided with a supporting extension (203) protruding in the opposite direction to the first direction, the supporting extension (203) having a height greater than the lancing section (201);

a bracket mounting groove (103) is formed in the edge of the notch of the accommodating groove (102), and the end part of the puncture bracket (202) and the support extension part (203) are embedded in the bracket mounting groove (103).

4. An electrical connection assembly according to claim 3, wherein the number of support extensions (203) is plural and equally circumferentially distributed around the puncture (201).

5. An electrical connection assembly according to claim 3, wherein a seal mounting groove (104) is formed at the edge of the notch of the accommodating groove (102) corresponding to the position of the sealing piece (3), and the sealing piece (3) is embedded in the seal mounting groove (104);

wherein the seal mounting groove (104) and the bracket mounting groove (103) are provided along the first direction.

6. An electrical connection assembly according to claim 1, wherein the flame retardant is a fluorocarbon or ketone.

7. A header comprising a header body (4), said header body (4) having an electrical connection assembly according to any one of claims 1 to 6 mounted thereon;

the top cover body (4) is provided with a first avoiding opening (401) corresponding to the position of the protruding portion (101), the adapter piece (1) is arranged on one side of the top cover body (4), and the protruding portion (101) penetrates through the first avoiding opening (401) and is located on the other side of the top cover body (4).

8. A cap according to claim 7, wherein a sleeve (5) is provided between the first relief opening (401) and the boss (101); the sleeve (5) is sleeved outside the protruding portion (101), a bottom side step portion (501) and an injection molding groove (502) are formed in the outer wall of the sleeve (5), and the bottom side step portion (501) protrudes out of the injection molding groove (502);

the sealing ring (6) is sleeved between the bottom side step part (501) and the first avoiding opening (401), an injection molding part (7) is formed in the injection molding groove (502) in an injection molding mode, and the injection molding part (7) is respectively connected with the sleeve (5) and the adapter piece (1).

9. A top cover according to claim 8, wherein a top side step part (503) is further formed on the outer wall of the sleeve (5), and the top side step part (503) is disposed on the side of the injection molding groove (502) away from the bottom side step part (501) and protrudes from the injection molding groove (502);

the injection molded part (7) extends in the first direction until the injection molded part (7) is aligned with the top side step part (503).

10. A battery comprising a housing, wherein the housing is provided with a mounting groove, a battery cell is arranged in the mounting groove, and a top cover as claimed in any one of claims 7 to 9 is arranged at a notch of the mounting groove.