CN220172252U - End cover assembly and battery cell - Google Patents

Abstract

The utility model relates to the technical field of batteries, in particular to an end cover assembly and a battery cell. The end cover assembly is adapted to a battery cell, and the battery cell is provided with a bendable tab; the end cover assembly is provided with a containing groove formed by surrounding the inner wall of the end cover and an opening facing the battery cell; the accommodating groove is configured to accommodate the tab in a bent state and restrict a portion of the tab from being exposed outside the end cap assembly in a case where the end cap is connected with the battery cell. According to the end cover assembly, the lug in the bending state is accommodated through the accommodating groove, so that the protection of the lug and the restraint of deformation of the lug are realized, the whole lug or a part of the lug is limited to be exposed out of the end cover assembly, and the risk of short circuit of the battery pack is further reduced.

Description

End cover assembly and battery cell

Technical Field

The utility model relates to the technical field of batteries, in particular to an end cover assembly and a battery cell.

Background

Battery packs currently contain a plurality of battery cells, which typically have a metal housing. Currently, in order to improve the space utilization of the whole battery pack, the tabs of the battery cells are generally longer and in a bent state.

The tab in this bent state is easily in contact with the metal case of the battery cell, thereby causing a short circuit of the battery pack. That is, current battery cells, after being assembled into a battery pack, often have a risk of shorting.

Disclosure of Invention

The utility model aims to provide an end cover assembly and a battery cell, wherein the end cover can prevent the tab from contacting with the shell of the battery cell to a certain extent by accommodating and limiting the exposed part of the tab, and finally can reduce the risk of short circuit of a battery pack.

In a first aspect, the present utility model provides an end cap assembly adapted to a battery cell, the battery cell having a bendable tab; the end cover assembly is provided with a containing groove formed by surrounding the inner wall of the end cover and an opening facing the battery unit; the accommodating groove is configured to accommodate the tab in a bent state and restrict a portion of the tab from being exposed outside the end cover assembly in a state that the end cover is connected with the battery cell.

The end cover assembly has the advantages that the lug in the bending state has the tendency of recovering deformation, so that the deformation recovery tendency is not limited, and the lug is in contact with the shell of the battery cell to cause short circuit. And hold the state utmost point ear that is in buckling through the holding tank, realized the protection of utmost point ear and its constraint that takes place deformation to restrict whole utmost point ear or a part of utmost point ear to expose outside the end cover subassembly, and then reduced the risk of battery package short circuit.

With reference to the first aspect, optionally, the device comprises an end cover body and a partition, wherein the end cover inner wall comprises a partition inner wall, and the partition inner wall is positioned on the surface of the partition facing the accommodating groove; the end cover body is provided with a length direction, a height direction and a width direction; the length direction is perpendicular to a plane where each bending direction of the tab is located, the height direction is parallel to the direction of the opening, and the width direction is not parallel to the length direction and the height direction; the partition plate is positioned on one of two sides of the end cover body, which are distributed along the width direction, and is detachably connected with the end cover body.

Above-mentioned end cover subassembly is through dismantling between end cover body and the baffle for in-process that the lug was welded with end cover subassembly etc. is connected, can pull down or temporarily not install this baffle earlier, and then for the connection process of end cover subassembly and lug provides bigger operating space, finally made things convenient for the connection operation between lug and the end cover subassembly.

With reference to the first aspect, optionally, the separator includes separator ends distributed along the length direction; the end cover body is provided with a guide groove; the guide slot is configured to receive and guide movement of a bulkhead end in a direction proximate the end cap body to connect the bulkhead with the end cap body.

According to the end cover assembly, the guide groove is formed in the end cover body, on one hand, the baffle plate is guided to be combined with the guide groove, so that the baffle plate can be positioned more accurately, and the end cover body and the baffle plate can be assembled conveniently; on the other hand, the part of the baffle protruding out of the end cover body is reduced by accommodating the end part of the baffle through the guide groove, and even the part of the baffle protruding out of the end cover body can be completely eliminated. Thereby reducing the space occupation of the end cap assembly.

With reference to the first aspect, optionally, the separator further includes a separator middle connecting two ends of the separator; the width of the end part of the partition plate in the height direction is equal to the width of the guide groove in the height direction; the width of the middle part of the partition plate in the height direction is larger than that of the end part of the partition plate in the height direction, and one side, close to the battery cell, of the middle part of the partition plate is flush with the edge of the opening of the accommodating groove on the end cover body.

Above-mentioned end cover subassembly for the holding tank that forms after baffle and the end cover body combine through the middle part edge of baffle and the opening edge part parallel and level of holding tank on the end cover body, have the opening of parallel and level, and then the end cover subassembly is under the circumstances of being connected with the battery monomer, and the leakproofness of the accommodation space that forms is better, or is convenient for seal the end cover subassembly in the junction with the battery monomer more said.

With reference to the first aspect, optionally, a first clamping part is disposed in the guide groove; the end part of the partition plate is provided with a second clamping part matched with the first clamping part; the first clamping part is configured to realize connection of the partition plate and the end cover body through clamping with the second clamping part.

Above-mentioned end cover subassembly realizes the detachable connection of baffle and end cover body through the joint, compares in modes such as spiro union, and such connected mode is more simple and convenient swift, and then has reduced end cover subassembly's manufacturing cost.

With reference to the first aspect, optionally, the guide groove includes a bottom wall for blocking the end portion of the partition from sliding in the guide groove; the first clamping part comprises a clamping hole formed in the bottom wall; the second clamping part comprises a protruding part extending along a surface facing the clamping hole from the end part of the partition plate towards the end cover body; the protruding part comprises a protruding body and an extending part which extends from one end of the protruding body, which is close to the end cover body, along the radial direction of the protruding body; the radial width of the extension part is larger than the diameter of the clamping hole and larger than the diameter of the protruding body; a relief groove is formed in the protruding part; the abdication groove penetrates through the side wall of the protruding portion and is configured to enable the protruding portion to deform and clamp into the clamping hole.

According to the end cover assembly, the clamping connection between the end cover body and the partition plate is realized through the extending part extending out of the protruding part and the abdication groove formed in the extending part. The principle and the structure are simple and convenient, and the production and the manufacture are convenient.

With reference to the first aspect, optionally, the extension has a wedge surface distributed along a radial direction thereof; the radial width of the extension part, which is close to one end of the end cover body, is smaller than the diameter of the clamping hole and smaller than the radial width of the extension part, which is far away from one end of the end cover body, and the radial width of the extension part, which is far away from one end of the end cover body, is larger than the diameter of the body.

In the end cover assembly, the wedge surface of the extending part along the radial distribution of the extending part can be understood as a surface with a guide angle, and in the process that the protruding part is clamped into the connectable hole, a user only needs to align the protruding part to the clamping hole, and other auxiliary operations are not needed. Corresponding deformation can occur under the guidance of the guide angle so as to adapt to the size of the clamping hole, and then the clamping is realized. The structure makes the process of clamping the end cover body and the partition plate simpler and more convenient for a user.

With reference to the first aspect, optionally, the end cap assembly includes a pole; the inner wall of the end cover is provided with a through hole; the pole comprises a pole body and an abutting part extending from one end of the pole body along the inner wall of the end cover; the pole penetrates through the through hole, the other end of the pole body is located outside the accommodating groove, and the abutting part abuts against the edge of the through hole; the abutting part is used for being electrically connected with the tab.

The end cover assembly realizes the export of the electric energy of the battery monomer transmitted by the tab under the condition that the end cover assembly and the battery monomer are assembled together. On the basis, the exposure of the tab is also ensured to a certain extent.

With reference to the first aspect, optionally, the end cap assembly further includes a seal; the pole body is provided with a groove which is arranged in a delayed radial surrounding manner; the sealing piece is sleeved in the groove and is positioned in the through hole so as to realize sealing connection between the pole body and the through hole.

Above-mentioned end cover subassembly seals the junction of through-hole and utmost point post body through the sealing washer, has improved the leakproofness of holding tank, and then better protection utmost point ear. In addition, the groove that sets up on the utmost point post body can prevent to a certain extent that the relative slip between sealing washer and the utmost point post body, and then also prevent to a certain extent that the relative slip between utmost point post and the end cover body. The structural stability and the reliability of the battery monomer are improved.

In a second aspect, the present utility model provides a battery cell comprising an end cap assembly as described in the first aspect or any of the alternative embodiments of the first aspect.

The above battery cell has the same advantages as the above first aspect or any of the optional embodiments of the first aspect, and will not be described here again.

In summary, according to the end cover assembly and the battery cell provided by the embodiments of the utility model, the tab in the bending state is accommodated by the accommodating groove, so that the protection of the tab and the restraint of the deformation of the tab are realized, the whole tab or a part of the tab is limited to be exposed out of the end cover assembly, and the risk of short circuit of the battery pack is further reduced. Through the detachable connection between end cover body and the baffle, for the connection process of end cover subassembly and utmost point ear provides bigger operating space, finally made things convenient for the connection operation between utmost point ear and the end cover subassembly. Through set up the guide way on the end cover body, played the effect that carries out more accurate location to the baffle to and reduced the effect that the space of end cover subassembly took up. The clamping connection between the partition plate and the end cover body enables the assembly between the partition plate and the end cover body to be simpler, more convenient and quicker. Further, the assembling operation between the end cover body and the partition plate is further simplified through the abdication groove formed on the protruding part and the clamping connection between the extending part extending out of the abdication groove and the clamping connection hole.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a perspective view of an end cap assembly provided in an embodiment of the present utility model;

FIG. 2 is a first exploded view of an end cap assembly provided in accordance with an embodiment of the present utility model;

FIG. 3 is a perspective view of a bulkhead in an end cap assembly according to an embodiment of the utility model;

FIG. 4 is a cross-sectional view of an end cap assembly according to an embodiment of the present utility model;

FIG. 5 is a second exploded view of an end cap assembly provided in accordance with an embodiment of the present utility model;

fig. 6 is a perspective view of a battery cell according to an embodiment of the present utility model;

fig. 7 is an exploded view of a battery cell according to an embodiment of the present utility model.

Icon: 10. a battery cell; 100. an end cap assembly; 110. a receiving groove; 120. an end cap body; 121. a guide groove; 122. a first clamping part; 1221. a clamping hole; 123. a through hole; 130. a partition plate; 131. a separator end; 132. the middle part of the baffle plate; 133. a second clamping part; 1331. a boss; 13311. a protrusion body; 13312. an extension; 13313. a relief groove; 140. a pole; 141. a pole body; 1411. a groove; 142. an abutting portion; 150. a seal ring; 200. a tab; 300. a battery cell; 400. a housing.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The embodiments of the utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the 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.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present utility model and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal," "vertical," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Referring to fig. 1, fig. 1 is a perspective view of an end cap assembly 100 according to an embodiment of the utility model. The end cap assembly 100 provided in the embodiment of the present utility model is adapted to a battery cell (not shown in the drawings), and the battery cell may have a bendable tab (not shown in the drawings). The end cap assembly 100 may have a receiving groove 110 formed around the inner wall of the end cap, and an opening toward the battery cell. The receiving groove 110 is configured to receive the tab in a bent state and restrict a portion of the tab from being exposed outside the cap assembly 100 when the cap is connected to the battery cell.

The battery cell may be a power battery, which may include the battery cell 300. The battery cell 300 outputs electric energy to the outside through the tab. The inner wall of the end cap forming the accommodating groove 110 may be an inner wall of one component, or may be an inner wall of a plurality of components surrounding the accommodating groove 110 in a case where the components are connected together by a detachable connection or a fixed connection.

In the case where the end cap assembly 100 is coupled with the battery cell, the opening of the receiving groove 110 may be blocked by the battery cell, forming a receiving space for receiving the tab. The space may or may not be completely sealed. The tab received by the receiving space may be in a bent state due to its long length.

In the implementation process, the tab in the bending state has a tendency of recovering deformation, so that the tab has a high possibility of short circuit caused by contact with the shell of the battery cell due to the fact that the tendency of recovering deformation is not limited. And the lug in a bending state is accommodated by the accommodating groove 110, so that the protection of the lug and the restraint of the lug in deformation are realized, the whole lug or a part of the lug is limited to be exposed out of the end cover assembly 100, and the risk of short circuit of the battery pack is further reduced.

Referring to fig. 2, fig. 2 is a first exploded view of an end cap assembly 100 according to an embodiment of the present utility model. In some alternative embodiments, the end cap assembly 100 may include an end cap body 120 and a bulkhead 130, and the end cap inner wall may include a bulkhead 130 inner wall, the bulkhead 130 inner wall being located on a surface of the bulkhead 130 facing the receiving slot 110. The end cap body 120 may have a length direction, a height direction, and a width direction. The length direction is perpendicular to the plane where each bending direction of the tab is located, the height direction is parallel to the direction of the opening, and the width direction is not parallel to the length direction and the height direction. The partition 130 is located at one of both sides of the end cap body 120, which are distributed in the width direction, and is detachably connected to the end cap body 120.

That is, the surface of the partition 130 facing the receiving groove 110 forms a part of the inner wall of the end cap.

The tabs are typically sheet-like and the direction of bending is also typically coplanar. On this basis, the embodiment of the utility model defines the length direction perpendicular to the plane where the bending directions of the tabs are located, the height direction parallel to the opening direction of the accommodating groove 110, and the width direction opposite to the length direction and the height direction. It will be appreciated that the three directions may or may not be orthogonal.

The detachable connection between the partition 130 and the end cap body 120 may be a clamping connection, a screwing connection, or the like.

In the above implementation process, through the detachable connection between the end cover body 120 and the partition 130, the partition 130 may be detached or not installed temporarily in the process of welding or the like between the tab and the end cover assembly 100, so as to provide a larger operation space for the connection process of the end cover assembly 100 and the tab, and finally facilitate the connection operation between the tab and the end cover assembly 100.

Referring to fig. 3 in conjunction with fig. 2, fig. 3 is a perspective view of a separator 130 in the end cap assembly 100 according to an embodiment of the present utility model. In some alternative embodiments, the separator 130 can include ends of the separator 130 that are distributed along the length. The end cover body 120 is provided with a guide groove 121. The guide groove 121 is configured to receive and guide the end of the partition 130 to move in a direction approaching the cap body 120 so that the partition 130 is coupled with the cap body 120.

The guide groove 121 may be opened in a position corresponding to the shape of the partition plate 130, and the guide direction of the guide groove 121 may be a width direction as shown in fig. 2, in which case the user may move the partition plate 130 from one side of the width direction of the cap body 120 toward the cap body 120 in the width direction to achieve coupling and connection thereof. In addition, the guide direction of the guide groove 121 may be other directions, for example, a height direction as shown in fig. 2, in which case the user may move the partition 130 vertically from above the cap body 120 toward the lower cap, to achieve coupling and connection thereof.

It will be appreciated that a person skilled in the art will be able to deduce, from the examples described above, in addition to other guiding directions in the length direction, width direction and height direction, guiding directions having an angle to the length direction, width direction and height direction. For example, a guide direction slightly inclined compared to the width direction may be inferred from the width direction described above, and a guide direction slightly inclined compared to the vertical downward direction may be inferred from the vertical downward direction described above.

In the above implementation process, the guide groove 121 is formed on the end cover body 120, so that on one hand, the baffle 130 is guided to be combined with the guide groove 121, so that the baffle 130 is positioned more accurately, and further, the assembly between the end cover body 120 and the baffle 130 is facilitated; on the other hand, the portion of the partition 130 protruding outside the end cap body 120 is reduced by the accommodation of the end portion of the partition 130 by the guide groove 121, and even the portion of the partition 130 protruding outside the end cap body 120 can be completely eliminated. Thereby reducing the space occupation of the end cap assembly 100.

With continued reference to fig. 2 and 3, in some alternative embodiments, the partition 130 may further include a middle portion of the partition 130 connecting the two ends of the partition 130. The width of the end portion of the partition 130 in the height direction is equal to the width of the guide groove 121 in the height direction. The width of the middle part of the separator 130 in the height direction is greater than the width of the end part of the separator 130 in the height direction, and one side of the middle part of the separator 130, which is close to the battery cell, is flush with the edge of the opening of the receiving groove 110 on the end cap body 120.

In other words, both ends of the partition 130 may have notches so that both ends of the partition 130 are matched with the guide grooves 121. And the middle of the separator 130 between the end portions of the two separators 130, one side thereof adjacent to the battery cells is flush with the opening edge portion of the receiving groove 110 of the cap body 120. Eventually forming a receiving groove 110 that is flush throughout the opening.

In the above implementation process, the middle edge of the partition 130 is flush with the opening edge of the accommodating groove 110 on the end cover body 120, so that the accommodating groove 110 formed after the partition 130 is combined with the end cover body 120 has a flush opening, and the end cover assembly 100 is better in tightness of the accommodating space formed under the condition of being connected with the battery cell, or is more convenient for sealing the junction of the end cover assembly 100 and the battery cell.

Referring to fig. 4 in conjunction with fig. 2 and 3, fig. 4 is a cross-sectional view of an end cap assembly 100 according to an embodiment of the present utility model. In some alternative embodiments, a first clamping portion 122 is disposed within the guide slot 121. The end of the partition 130 is provided with a second clamping portion 133 that mates with the first clamping portion 122. The first clamping portion 122 is configured to connect the partition 130 and the end cap body 120 by clamping with the second clamping portion 133.

The first clamping portion 122 may be a clamping groove or a clamping hole 1221, and the second clamping portion 133 may be a corresponding clamping joint; conversely, the second clamping portion 133 may be a clamping groove or a clamping hole 1221, and the first clamping portion 122 may be a corresponding clamping joint.

In the above implementation process, the detachable connection between the partition 130 and the end cover body 120 is implemented through the clamping, and compared with the screwing and other modes, the connection mode is simpler, more convenient and quicker, and the manufacturing cost of the end cover assembly 100 is further reduced.

With continued reference to fig. 2, 3 and 4, in some alternative embodiments, the guide slot 121 may include a bottom wall for blocking the end of the baffle 130 from sliding within the guide slot 121. The first clamping portion 122 may include a clamping hole 1221 formed in the bottom wall. The second clamping portion 133 may include a boss 1331 extending along a facing clamping hole 1221 from an end of the bulkhead 130 toward the end cap body 120. The boss 1331 may include a boss body 13311 and an extension 13312 extending radially therefrom from an end of the boss body 13311 proximate to the end cap body 120. The radial width of the extension 13312 is greater than the diameter of the clamping hole 1221 and greater than the diameter of the boss body 13311. The boss 1331 is provided with a relief groove 13313. The relief groove 13313 penetrates the sidewall of the boss 1331 and is configured to deform the boss 1331 to be engaged with the engaging hole 1221.

The locking hole 1221 may be a circular hole, a square hole, or a hole of another shape. The cross section of the boss 1331 perpendicular to the extending direction thereof may be circular or square. Accordingly, the above-described "diameter" and "radial width" are not limited to the circular hole and the circular cross-section boss 1331. For example, in the case where the click hole 1221 is a square hole, the diameter thereof may be a longer or diagonal line thereof; in the case where the boss 1331 is square in cross section, the radial width thereof may be a side length or a diagonal length thereof.

The depth of the relief groove 13313 formed in the boss 1331 may be equal to the length of the entire boss 1331, or may be greater than the length of the extension 13312 in the width direction and less than the length of the entire boss 1331. The number of the relief grooves 13313 may be one, two or three. If the number of the relief slots 13313 is one, it will generally divide the relief slots 13313 into two; in the case where the number of relief grooves 13313 is two, it is generally possible to divide the boss 1331 into four portions … …, and in addition, the relief groove 13313 may also be Y-shaped, which is generally possible to divide the boss 1331 into three portions; the boss 1331 may also be generally divided into five portions in a "large" shape. Therefore, the shape and the specific number of the relief grooves 13313 are not limited in the embodiment of the utility model.

It should be noted that, in the case where the cross-sectional shape of the boss 1331 is square or circular before the relief groove 13313 is formed, the cross-sectional shape of the boss 13313 is not generally square or circular in a non-strict sense, but is "incomplete square (circular)". Accordingly, the concepts of "diameter" and "radial width" described above are based on the shape of the cross section before the relief groove 13313 is formed.

The radially extending surface of the extension 13312 may have a chamfer, in which case, by its corresponding sizing, a user may directly align and snap the boss 1331 into the snap hole 1221 during assembly of the housing end body with the bulkhead 130. Without additional assistance, the portions of the boss 1331 divided by the relief slots 13313 are generally brought together by themselves under the guidance of the guide angle by means of the relief slots 13313 on the boss 1331, thereby reducing the radial dimension of the extension 13312. After the extension portion 13312 completely passes through the clamping hole 1221, the protrusion portion 1331 will recover to deform because the diameter of the protrusion portion 1331 is smaller than the diameter of the extension portion 13312, so that the radial dimension of the extension portion 13312 is larger than the diameter of the clamping hole 1221, and further the clamping is achieved. In addition, the surface of the extension 13312 along the radial direction may not have any chamfer, in which case, the user may press several portions of the relief portion divided by the relief groove 13313 against each other by an external operation, such as hand pressing, during the process of assembling the housing end body and the partition 130, so that the radial dimension of the extension 13312 is reduced. The reduced radial extension 13312 is generally capable of being snapped into the snap hole 1221 by a user, with subsequent operation and principles substantially consistent with the rounded shape of the extension 13312.

The above-described structure may be provided on the second separator 130 and on the side of the end cap body 120 corresponding to the second separator 130.

In the above implementation process, the extending portion 13312 extending from the boss 1331 and the relief groove 13313 formed on the extending portion 1331 implement the locking connection between the end cover body 120 and the partition 130. The principle and the structure are simple and convenient, and the production and the manufacture are convenient.

With continued reference to fig. 2, 3 and 4, in some alternative embodiments, the extension 13312 may have wedge surfaces radially distributed therealong. The radial width of the end of the extension 13312 near the end cover body 120 is smaller than the diameter of the clamping hole 1221, and smaller than the radial width of the end of the extension 13312 far away from the end cover body 120, and the radial width of the end of the extension 13312 far away from the end cover body 120 is larger than the diameter of the body.

The wedge surfaces described above can be understood as having the chamfer on the radially extending surface of the extension 13312 as described in the previous embodiments. The principle and operation of the present utility model are also described in the foregoing embodiments, so that the embodiments of the present utility model will not be described again.

In the above implementation, the wedge surface of the extending portion 13312 along the radial direction thereof may be understood as having a chamfer on the radial surface thereof, which only needs to be aligned with the clamping hole 1221 by the user during the process of clamping the protrusion 1331 into the accessible hole, and no other auxiliary operation is needed. Corresponding deformation can occur under the guidance of the guide angle so as to adapt to the size of the clamping hole 1221, and further the clamping is realized. Such a structure makes the process of the user performing the clamping between the cap body 120 and the partition 130 easier.

Referring to fig. 5, fig. 5 is a second exploded view of an end cap assembly 100 according to an embodiment of the present utility model. In some alternative embodiments, the end cap assembly 100 may include a pole 140. The inner wall of the end cap is provided with a through hole 123. The pole 140 may include a pole 140 body and an abutment 142 extending along an end cap inner wall from one end of the pole 140 body. The pole 140 penetrates the through hole 123, the other end of the pole 140 body is located outside the accommodating groove 110, and the abutting portion 142 abuts against the edge of the through hole 123. The abutting portion 142 is used for being electrically connected with the tab.

The body of the pole 140 may be cylindrical or prismatic. The abutment 142 may be a square flat plate or a circular flat plate having a larger diameter than the body of the pole 140. In the process of assembling the battery cell and the end cover, the tab can be connected to the surface of the abutment portion 142 facing the battery cell by welding.

In the above implementation process, the electric energy of the battery cell transmitted by the tab is led out when the end cover assembly 100 is assembled with the battery cell. On the basis, the exposure of the tab is also ensured to a certain extent.

With continued reference to fig. 5, in some alternative embodiments, the end cap assembly 100 may also include a seal. The body of the pole 140 may have a recess 1411 disposed radially therearound with a delay. The sealing member is sleeved in the groove 1411 and is positioned in the through hole 123 so as to realize sealing connection between the pole 140 body and the through hole 123.

The sealing ring 150 may be made of one or more of nitrile, natural rubber, silica gel, etc.

In the above implementation process, the connection part between the through hole 123 and the pole 140 body is sealed by the sealing ring 150, so that the tightness of the accommodating groove 110 is improved, and the pole lug is better protected. In addition, the groove 1411 provided on the body of the pole 140 can prevent the relative sliding between the seal ring 150 and the body of the pole 140 to a certain extent, and further prevent the relative sliding between the pole 140 and the end cover body 120 to a certain extent. The structural stability and the reliability of the battery monomer are improved.

Referring to fig. 6 and 7, fig. 6 is a perspective view of a battery cell 10 according to an embodiment of the utility model; fig. 7 is an exploded view of a battery cell 10 provided in an embodiment of the present utility model. Based on the same conception, embodiments of the present utility model provide a battery cell 10 that may include the end cap assembly 100 described in the previous embodiments.

The battery cell 10 may include a battery cell 300 and a housing 400, the end cap assembly 100 may be connected to the housing 400, and the connection between the end cap assembly 100 and the housing 400 may be by welding, bonding, or detachable connection.

The battery cell 10 provided in the embodiment of the present utility model has the same advantages as the end cap assembly 100 described in the previous embodiment, and the description of the embodiment of the present utility model is omitted.

In summary, the end cover assembly 100 and the battery cell provided in the embodiments of the present utility model accommodate the tab 200 in the bent state through the accommodating groove 110, so as to protect the tab 200 and restrict the tab 200 from deforming, so as to limit the entire tab 200 or a part of the tab 200 from being exposed out of the end cover assembly 100, thereby reducing the risk of short circuit of the battery pack. Through the detachable connection between the end cover body 120 and the partition 130, a larger operation space is provided for the connection process of the end cover assembly 100 and the tab 200, and finally, the connection operation between the tab 200 and the end cover assembly 100 is facilitated. By providing the guide groove 121 on the end cap body 120, a more accurate positioning of the spacer 130 is achieved and the space occupation of the end cap assembly 100 is reduced. The clamping between the partition 130 and the end cover body 120 makes the assembly between the two easier and quicker. Further, the assembling operation between the cap body 120 and the partition 130 is further simplified by the relief groove 13313 formed on the boss 1331 and the engagement between the extended portion 13312 protruding therefrom and the engagement hole 1221.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (10)

1. An end cap assembly adapted to a battery cell having a bendable tab;

the end cover assembly is provided with a containing groove formed by surrounding the inner wall of the end cover and an opening facing the battery unit;

the accommodating groove is configured to accommodate the tab in a bent state and restrict a portion of the tab from being exposed outside the end cover assembly in a state that the end cover is connected with the battery cell.

2. The end cap assembly of claim 1, comprising an end cap body and a bulkhead, the end cap inner wall comprising a bulkhead inner wall on a surface of the bulkhead facing the receiving slot;

the end cover body is provided with a length direction, a height direction and a width direction; the length direction is perpendicular to a plane where each bending direction of the tab is located, the height direction is parallel to the direction of the opening, and the width direction is not parallel to the length direction and the height direction;

the partition plate is positioned on one of two sides of the end cover body, which are distributed along the width direction, and is detachably connected with the end cover body.

3. The end cap assembly of claim 2, wherein the bulkhead includes bulkhead ends distributed along the length;

the end cover body is provided with a guide groove;

the guide slot is configured to receive and guide movement of a bulkhead end in a direction proximate the end cap body to connect the bulkhead with the end cap body.

4. The end cap assembly of claim 3, wherein said bulkhead further comprises a bulkhead center connecting two of said bulkhead ends;

the width of the end part of the partition plate in the height direction is equal to the width of the guide groove in the height direction;

the width of the middle part of the partition plate in the height direction is larger than that of the end part of the partition plate in the height direction, and one side, close to the battery cell, of the middle part of the partition plate is flush with the edge of the opening of the accommodating groove on the end cover body.

5. The end cap assembly of claim 3, wherein the guide slot has a first snap fit therein;

the end part of the partition plate is provided with a second clamping part matched with the first clamping part;

the first clamping part is configured to realize connection of the partition plate and the end cover body through clamping with the second clamping part.

6. The end cap assembly of claim 5, wherein the guide slot includes a bottom wall for blocking sliding of the bulkhead end in the guide slot;

the first clamping part comprises a clamping hole formed in the bottom wall;

the second clamping part comprises a protruding part extending along a surface facing the clamping hole from the end part of the partition plate towards the end cover body;

the protruding part comprises a protruding body and an extending part which extends from one end of the protruding body, which is close to the end cover body, along the radial direction of the protruding body;

the radial width of the extension part is larger than the diameter of the clamping hole and larger than the diameter of the protruding body;

a relief groove is formed in the protruding part;

the abdication groove penetrates through the side wall of the protruding portion and is configured to enable the protruding portion to deform and clamp into the clamping hole.

7. The end cap assembly of claim 6, wherein the extension has a wedge surface radially disposed therealong;

the radial width of the extension part, which is close to one end of the end cover body, is smaller than the diameter of the clamping hole and smaller than the radial width of the extension part, which is far away from one end of the end cover body, and the radial width of the extension part, which is far away from one end of the end cover body, is larger than the diameter of the body.

8. The end cap assembly of claim 1, wherein the end cap assembly comprises a pole;

the inner wall of the end cover is provided with a through hole;

the pole comprises a pole body and an abutting part extending from one end of the pole body along the inner wall of the end cover;

the pole penetrates through the through hole, the other end of the pole body is located outside the accommodating groove, and the abutting part abuts against the edge of the through hole;

the abutting part is used for being electrically connected with the tab.

9. The end cap assembly of claim 8, further comprising a seal;

the pole body is provided with a groove which is arranged in a delayed radial surrounding manner;

the sealing piece is sleeved in the groove and is positioned in the through hole so as to realize sealing connection between the pole body and the through hole.

10. A battery cell comprising the end cap assembly of any one of claims 1 to 9.