CN220984756U - End cover structure and battery module - Google Patents

Abstract

The utility model relates to the technical field of batteries and discloses an end cover structure and a battery module. The battery module comprises an end cover structure, the end cover structure is buckled on the shell, the end cover structure comprises an end plate and an insulating cover plate, the end plate is molded by adopting a cast aluminum process, the edge of the end plate, which is attached to the shell, is connected through laser seam welding, the welding area is larger, the welding strength is high, and the connection is firm. The insulating cover plate is overlapped in one side that the end plate is close to the casing, one of them is equipped with the spacing groove, and another is equipped with spacing arch, and spacing arch grafting is spacing in the spacing inslot for end plate and insulating top cap combine firmly, and can fix a position the phase position of end plate and insulating top cap during the installation, make end plate and insulating top cap can integrate as an organic wholely fast, simplified the equipment process, the installation is more convenient, has saved assembly time cost, has improved installation effectiveness, is applicable to large-scale volume production.

Description

End cover structure and battery module

Technical Field

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

Background

The battery module is an intermediate energy storage unit between the battery cell unit and the battery pack, and the battery module forms a modularized battery pack by connecting a plurality of battery cells in series and parallel and adding auxiliary structural members which play roles in collecting current, collecting data, fixing and protecting the battery cells and the like.

The conventional battery module generally includes a case and an end cap structure, and the end cap structure is fastened to both ends of the case to close the openings at both ends of the case. The end cover structure generally comprises an end plate and an insulating cover plate, in the scheme of the prior art, the insulating cover plate and the Block frame after stacking are generally installed, then the end plate and the Block frame are installed to form the end cover structure, the assembly process is complex, and in large-scale mass production, the time cost and the assembly process are increased, so that the product cost is increased. Secondly, after the battery cell assembly is put into the shell, the peripheral edges of the end plate and the shell are required to be welded and fixed, but the current end plate is mostly formed by adopting an aluminum extrusion molding process, and only the side edges of the end plate and the shell can be welded and fixed in a penetrating way, so that the welding strength is insufficient.

Therefore, it is desirable to provide an end cap structure and a battery module to solve the above problems.

Disclosure of utility model

An object of the present utility model is to provide an end cap structure which can simplify the assembly process, is suitable for mass production, and has a large welding area between the end plate and the housing, high welding strength, and firm connection.

Another object of the present utility model is to provide a battery module, in which the above end plate structure is provided, so that the assembly process can be simplified, the battery module is suitable for mass production, and the welding area between the end plate and the case is large, the welding strength is high, and the connection is firm.

In order to achieve the purpose, the utility model is realized by the following technical scheme:

an end cover structure is detained on the casing, end cover structure includes:

The end plate is formed by adopting a cast aluminum process, and the edge of the end plate, which is attached to the shell, is connected by laser seam welding;

the insulation cover plate is overlapped on one side, close to the shell, of the end plate and one of the insulation cover plate is provided with a limiting groove, the other one of the insulation cover plate and the end plate is provided with a limiting protrusion, and the limiting protrusion is inserted into and limited in the limiting groove.

As an alternative scheme, the quantity of spacing groove sets up to a plurality ofly, the quantity of spacing arch sets up to a plurality ofly and with a plurality of spacing groove one-to-one, every spacing arch can peg graft and spacing in corresponding spacing inslot.

As an alternative scheme, the insulating cover plate is a plastic part, the insulating cover plate is provided with the limiting protrusions, and the end plate is provided with the limiting grooves.

As an alternative, the end plate comprises a thin wall plate which is horizontally arranged along the length direction of the end plate, and the limit groove is formed in the thin wall plate.

As an alternative scheme, the spacing protruding setting is cross or T shape, and it includes grafting portion and the butt portion of perpendicular connection, grafting portion grafting and block in the spacing inslot, butt portion butt in the surface of thin wall board.

As an alternative scheme, be formed with on the end plate and dodge the hole, dodge the hole by the thin wall board with the end plate prescribes a limit jointly and form, the insulating apron orientation one side of end plate is equipped with the brace table, the brace table is used for supporting and connecting the copper bar, the brace table can pass dodge the hole, in order to expose the copper bar.

As an alternative, the end plate has a first recess arranged concavely in a direction facing away from the insulating cover plate, and the insulating cover plate has a second recess arranged concavely in a direction facing toward the end plate, the second recess being accommodated in the first recess.

As an alternative, the end plate is provided with a reinforcing part toward one side of the insulating cover plate and at both ends in the length direction.

As an alternative, the end cover structure further includes a through hole penetrating through the end plate and the insulating cover plate at the same time, and the through hole is used for lifting and exhausting.

The battery module comprises a shell, a battery cell assembly and any one of the end cover structures, wherein the battery cell assembly is accommodated in the shell, the end cover structure is buckled at the end part of the shell, and the end plate is connected with the edge of the shell in a bonding mode through laser seam welding.

The beneficial effects of the utility model are as follows:

According to the end cover structure provided by the utility model, the end plate and the insulating top cover are firmly combined through the plug-in matching of the limiting protrusion and the limiting groove, and the phase positions of the end plate and the insulating top cover can be positioned during installation, so that the end plate and the insulating top cover can be rapidly integrated into a whole, the assembly process is simplified, the installation is more convenient, the assembly time cost is saved, the installation efficiency is improved, and the end cover structure is suitable for large-scale mass production. Through adopting cast aluminum technology shaping with the end plate for the edge of end plate and casing laminating can be connected through laser seam welding, and the welding area is bigger, and welding strength is high, firm in connection.

Drawings

For a more obvious and understandable description of embodiments of the utility model or solutions according to the prior art, reference will be made to the accompanying drawings, which are used in the description of the embodiments or the prior art and which are examples of the utility model, and from which other drawings can be obtained without inventive effort for a person skilled in the art.

Fig. 1 is an exploded view of a battery module according to an embodiment of the present utility model;

FIG. 2 is a schematic structural view of an end cap structure according to an embodiment of the present utility model;

FIG. 3 is a schematic view of an end plate according to an embodiment of the present utility model at a first view angle;

FIG. 4 is a schematic view of an end plate according to an embodiment of the present utility model at a second view angle;

Fig. 5 is a schematic structural view of an insulating cover plate according to an embodiment of the present utility model;

fig. 6 is a partial enlarged view at a in fig. 5.

In the figure:

10. An end cap structure; 11. an end plate; 111. bao Biban; 112. a limit groove; 113. avoidance holes; 114. a first concave portion; 115. a reinforcing part; 116. a mounting hole; 12. an insulating cover plate; 121. a limit protrusion; 1211. a plug-in part; 1212. an abutting portion; 122. a support table; 123. a second concave portion; 124. a third recess; 13. a through hole;

20. a housing; 21. a first housing; 22. a second housing;

30. and a cell assembly.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the 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.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are orientation or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus 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 utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

As shown in fig. 1, the present embodiment provides a battery module, including a housing 20, a battery cell assembly 30 and an end cover structure 10, wherein the battery cell assembly 30 is accommodated in the housing 20, the end cover structure 10 is disposed at two ends of the battery cell assembly 30, and the end cover structure 10 is fastened to an end of the housing 20 to close openings at two ends of the housing 20. The casing 20 is a square casing, and includes a first casing 21 and a second casing 22 that are fastened to each other up and down, where the first casing 21 and the second casing 22 are both U-shaped casings, and the side height of the first casing 21 is greater than the side height of the second casing 22, and the battery cell assembly 30 is located in a space enclosed by the first casing 21, the second casing 22 and the two end cover structures 10, so as to play a better role in protecting the battery cell assembly 30.

Specifically, as shown in fig. 1 and 2, the end cap structure 10 includes an end plate 11 and an insulating cover plate 12, the insulating cover plate 12 is stacked on one side of the end plate 11 near the housing 20, the end plate 11 is disposed at both ends of the cell assembly 30, and the insulating cover plate 12 is disposed between the end face of the cell assembly 30 and the end plate 11 to perform an insulating function.

In the prior art, when assembling the end plate 11 and the insulating cover plate 12, the insulating cover plate 12 and the stacked Block frame are generally installed first, and then the end plate 11 and the Block frame are installed to form the end cover structure 10, so that the assembly process is complicated, and in large-scale mass production, the time cost and the assembly process are increased, thereby increasing the product cost.

In order to solve the above-mentioned problems, as shown in fig. 3 to 5, in the present embodiment, one of the end plate 11 and the insulating cover plate 12 is provided with a limit groove 112, and the other is provided with a limit protrusion 121, and the limit protrusion 121 is inserted and limited in the limit groove 112. Through spacing protruding 121 and spacing groove 112's grafting cooperation for end plate 11 and insulating cover plate 12 are together fixed, have promoted the connection stability between the two, and can also fix a position the phase position of end plate 11 and insulating cover plate 12 during the installation, make end plate 11 and insulating cover plate 12 can be integrated as an organic wholely fast, have cancelled the setting of Block frame, have simplified the equipment process, and the installation is more convenient, has saved assembly time cost, has improved installation effectiveness, is applicable to large-scale mass production.

Referring to fig. 1, it should be noted that the assembly process of the battery module provided in this embodiment is: the end plate 11 and the insulating cover plate 12 are integrated together to form the end cover structure 10, then the cell assembly 30 is placed in the first shell 21, then the two end cover structures 10 and the second shell 22 are packaged, and finally the end plate 11 and the peripheral edge of the shell 20 are welded and fixed.

However, in the prior art, the end plate 11 is mostly formed by using an aluminum extrusion process, and only the side edges of the end plate 11 and the shell 20 can be fixed by penetration welding, so that the connection between the end plate 11 and the shell 20 is unstable due to insufficient welding strength.

In order to solve the above problems, in this embodiment, the end plate 11 is formed by adopting a cast aluminum process, the end plate 11 is AlSi10MgMn, and has good casting performance, increased structural strength, reduced weight, and on this basis, the peripheral edges of the end plate 11 and the housing 20 are bonded by laser seam welding, so that the welding area is larger, the welding strength is higher, and the connection is firmer. In addition, the first casing 21 and the second casing 22 are preferably made of aluminum alloy, so that welding with the end plate 11 is facilitated, the weight of the battery module can be reduced, the energy density of the battery module is improved, the outer parts of the battery cell assembly 30 are wrapped by metal pieces, and the protection effect is better.

As shown in fig. 3 to 5, in one embodiment, the limit groove 112 is provided on the end plate 11, and the limit protrusion 121 is provided on the insulating cover plate 12. Specifically, the end plate 11 includes a thin-walled plate 111 lying along a length direction thereof, a limiting groove 112 is formed in Bao Biban a, the insulating cover 12 is a plastic part, the insulating cover 12 is made of pp+20% gf, and a limiting protrusion 121 is disposed on the insulating cover 12. Through setting up spacing groove 112 on thin-walled plate 111, can be convenient for the processing of spacing groove 112, can save manufacturing cost again, and through setting up spacing arch 121 on insulating cover plate 12, utilize the elasticity resilience of plastic part, can make spacing arch 121 stable block in spacing groove 112, promoted the connection stability between end plate 11 and the insulating cover plate 12. In another embodiment, the limit groove 112 may be alternatively disposed on the insulating cover 12, and the limit protrusion 121 may be disposed on the end plate 11.

Preferably, the number of the limiting grooves 112 is multiple, the number of the limiting protrusions 121 is multiple and corresponds to the limiting grooves 112 one by one, and each limiting protrusion 121 can be inserted into and limited in the corresponding limiting groove 112, so that the stability of connection between the end plate 11 and the insulating cover plate 12 can be further ensured.

Illustratively, as shown in fig. 3, in this embodiment, the number of the thin-walled plates 111 is two, the two thin-walled plates 111 are arranged at intervals along the length direction of the end plate 11, the number of the limit grooves 112 is four, two limit grooves 112 are arranged on each thin-walled plate 111, correspondingly, as shown in fig. 5, the number of the limit protrusions 121 is four, four limit protrusions 121 are arranged at intervals along the length direction of the insulating cover plate 12, each limit protrusion 121 can be inserted and limited in the corresponding limit groove 112, and the stability of connection between the end plate 11 and the insulating cover plate 12 can be further improved on the premise of ensuring convenience in assembly. In other embodiments, the number of the limiting grooves 112 and the limiting protrusions 121 may be two, three or more, which may be flexibly set according to actual requirements, and is not limited herein.

As an example, as shown in fig. 5 and 6, the limit protrusion 121 is provided in a cross shape or a T shape, which includes a plug portion 1211 and an abutment portion 1212 that are vertically connected, the plug portion 1211 extends in a vertical direction, the abutment portion 1212 extends in a horizontal direction, the limit groove 112 extends in a vertical direction, the plug portion 1211 is plugged and locked in the limit groove 112, and the abutment portion 1212 abuts against the surface of the thin-walled plate 111, thereby achieving the fit between the limit protrusion 121 and the limit groove 112. Through the above arrangement, the insulating cover plate 12 can be limited to move along multiple directions, so that the stability of connection between the end plate 11 and the insulating cover plate 12 is ensured, and the limiting protrusions 121 and the limiting grooves 112 in the above forms are easy to process, so that the cost is saved. In other embodiments, the limiting protrusion 121 and the limiting groove 112 may be provided in a circular shape, a square shape or other shapes, and may be flexibly provided according to actual needs, which is not limited herein.

Further, as shown in fig. 3 and fig. 4, the end plate 11 is formed with a relief hole 113, the relief hole 113 is defined by the thin-walled plate 111 and the end plate 11, the relief hole 113 penetrates through two side surfaces of the end plate 11, a supporting table 122 is arranged on one side, facing the end plate 11, of the insulating cover plate 12, the upper surface of the supporting table 122 is used for supporting and connecting copper bars, the copper bars are electrically connected with the cell assembly 30 and used for outputting current, and the supporting table 122 can penetrate through the relief hole 113 to expose the copper bars, so that the copper bars are convenient to electrically connect with external devices.

Specifically, as shown in fig. 5, two support tables 122 are provided, two limiting protrusions 121 are provided under each support table 122, in this embodiment, the limiting protrusions 121 are preferably cross-shaped, and the top ends of the limiting protrusions 121 extend and are connected to the bottom of the support table 122, so that the structural strength of the limiting protrusions 121 can be ensured. As shown in fig. 3 and fig. 4, two avoidance holes 113 are also provided, the thin wall plate 111 is the lower surface of the avoidance hole 113, and when the supporting table 122 passes through the avoidance hole 113, the limiting protrusions 121 are inserted and limited in the corresponding limiting grooves 112, so that the operation is convenient.

As shown in fig. 3 and 5, the end plate 11 has a first recess 114 concavely disposed in a direction away from the insulating cover plate 12, the insulating cover plate 12 has a second recess 123 concavely disposed toward the end plate 11, the second recess 123 forms a corresponding convex structure on the other side of the insulating cover plate 12, and the second recess 123 is accommodated in the first recess 114. The second depressed part 123 is mainly used for dodging the structure of electric core subassembly 30 tip, and first depressed part 114 is mainly used dodges second depressed part 123, simultaneously, through the cooperation of second depressed part 123 and first depressed part 114, can make end plate 11 and insulating cover plate 12 combine inseparabler again for end plate 11 structure is thinner, occupation space is littleer.

As shown in fig. 3, the end plate 11 is provided with reinforcing portions 115 toward one side of the insulating cover 12 and at both ends in the longitudinal direction. As shown in fig. 4, it can be understood that the end plate 11 is provided at one side facing away from the insulating cover plate 12 and at both ends in the length direction with mounting holes 116 extending in the vertical direction, the mounting holes 116 being used to pass screws to fix the battery module as a whole at a preset position, and therefore, the end plate 11 is easily deformed at both ends, requiring structural strength to be secured therein. By providing the reinforcing portions 115 at these two positions, the wall thickness of the end plate 11 at both ends can be increased, thereby improving the structural strength of the end plate 11.

As shown in fig. 3 and fig. 5, the surface of the reinforcing portion 115 adopts an arc surface, one side of the insulating cover plate 12 facing the end plate 11 is contoured, that is, a third recess portion 124 is provided at a position of the insulating cover plate 12 corresponding to the reinforcing portion 115, the surface of the third recess portion 124 is an arc surface, after the insulating cover plate 12 is buckled with the end plate 11, the reinforcing portion 115 is accommodated in the third recess portion 124, and the arc surfaces of the two are matched and attached. Through the arrangement, the end plate 11 and the insulating cover plate 12 can be combined more tightly, the occupied space is smaller, the wall thickness of the part can be increased, the structural strength of the whole end cover structure 10 is improved, and deformation of the part when screwing screws is avoided.

As shown in fig. 4 and 5, the end cap structure 10 further includes a through hole 13 penetrating both the end plate 11 and the insulating cover plate 12, the through hole 13 being used for lifting and exhausting. When the through holes 13 are used as lifting holes, the battery module is convenient to lift in the carrying process. When the through holes 13 are used as exhaust holes, the pressure relief and heat dissipation of the battery module are facilitated. As shown in fig. 4 and 5, the number of the through holes 13 may be two, and in other embodiments, the number of the through holes 13 may be one, three or more, which may be flexibly set according to actual requirements, and is not specifically limited herein.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (10)

1. An end cap structure, detain on locating casing (20), characterized in that, end cap structure includes:

the end plate (11) is formed by adopting a cast aluminum process, and the edge of the end plate (11) attached to the shell (20) is connected by laser seam welding;

The insulating cover plate (12) is stacked on one side, close to the shell (20), of the end plate (11), one of the end plate (11) and the insulating cover plate (12) is provided with a limiting groove (112), the other end plate is provided with a limiting protrusion (121), and the limiting protrusion (121) is inserted and limited in the limiting groove (112).

2. The end cover structure according to claim 1, wherein the number of the limit grooves (112) is plural, the number of the limit protrusions (121) is plural and corresponds to the limit grooves (112) one by one, and each limit protrusion (121) can be inserted and limited in the corresponding limit groove (112).

3. The end cover structure according to claim 1, wherein the insulating cover plate (12) is a plastic part, the insulating cover plate (12) is provided with the limiting protrusion (121), and the end plate (11) is provided with the limiting groove (112).

4. An end cap structure according to claim 3, wherein the end plate (11) comprises a thin wall plate (111) lying along its length, and the limiting groove (112) is provided on the thin wall plate (111).

5. The end cover structure according to claim 4, wherein the limit protrusion (121) is configured as a cross or T-shape, and comprises a vertically connected plug portion (1211) and an abutment portion (1212), the plug portion (1211) is plugged into and locked in the limit groove (112), and the abutment portion (1212) abuts against the surface of the Bao Biban (111).

6. The end cover structure according to claim 4, wherein the end plate (11) is formed with a relief hole (113), the relief hole (113) is defined by Bao Biban (111) and the end plate (11), a support table (122) is disposed on a side of the insulating cover plate (12) facing the end plate (11), the support table (122) is used for supporting and connecting copper bars, and the support table (122) can pass through the relief hole (113) to expose the copper bars.

7. End cap structure according to any one of claims 1 to 6, characterized in that the end plate (11) has a first recess (114) arranged concavely in a direction away from the insulating cover plate (12), the insulating cover plate (12) has a second recess (123) arranged concavely towards the end plate (11), the second recess (123) being accommodated in the first recess (114).

8. End cap structure according to any one of claims 1 to 6, characterized in that the end plate (11) is provided with reinforcement parts (115) towards one side of the insulating cover plate (12) and at both ends in the length direction.

9. End cap structure according to any of claims 1-6, characterized in that it further comprises a through hole (13) penetrating both the end plate (11) and the insulating cover plate (12), said through hole (13) being used for lifting and venting.

10. The battery module is characterized by comprising a shell (20), a battery cell assembly (30) and the end cover structure according to any one of claims 1-9, wherein the battery cell assembly (30) is accommodated in the shell (20), the end cover structure is buckled at the end part of the shell (20), and the edge of the end plate (11) attached to the shell (20) is connected through laser seam welding.