CN215578908U

CN215578908U - Battery module and battery pack

Info

Publication number: CN215578908U
Application number: CN202121100887.3U
Authority: CN
Inventors: 刘文锋
Original assignee: Evergrande New Energy Technology Shenzhen Co Ltd
Current assignee: Evergrande New Energy Technology Shenzhen Co Ltd
Priority date: 2021-05-21
Filing date: 2021-05-21
Publication date: 2022-01-18
Anticipated expiration: 2031-05-21

Abstract

The utility model relates to the technical field of batteries, and particularly discloses a battery module and a battery pack. This battery module includes the electric core group of constituteing by a plurality of electric cores, still includes two combination end plates and two curb plates, and two combination end plates set up relatively in electric core group along its length direction's both sides, and the combination end plate includes main end plate and vice end plate, and main end plate has seted up the draw-in groove that runs through its upper end, and vice end plate detachably sets up in main end plate's upper end to the opening of shutoff draw-in groove in main end plate upper end. The two side plates are oppositely arranged at two sides of the electric core group along the width direction of the electric core group. The both ends of curb plate all are provided with the locking piece, and the cooperation is pegged graft with the draw-in groove that corresponds to the locking piece, and the opening parallel and level of at least partial top surface and draw-in groove of locking piece. The locking piece is in plug-in fit with the clamping groove, so that the combined end plate and the side plate are assembled through splicing, the structure is simple, the assembly quality and the assembly efficiency of the battery module are improved, and the assembly cost is reduced.

Description

Battery module and battery pack

Technical Field

The utility model belongs to the technical field of batteries, and particularly relates to a battery module and a battery pack.

Background

The battery module is mainly assembled by components such as a battery cell group, an end plate, a side plate and a bus bar. Two end plates set up in the both ends of electric core array orientation relatively, and two curb plates set up relatively to enclose into the shell of battery module with two end plates, with fixed and the inside electric core group of protection.

In the assembling process of the battery module, the end plate and the side plate are positioned with higher precision through the positioning tool fixture, and the connecting part of the end plate and the side plate is welded by the laser welding equipment. The problems that exist at present are: laser welding equipment and a positioning tool fixture are needed, so that the cost is high and the efficiency is low. In the welding process, the structure of the battery module is easy to deform and the size is difficult to meet the requirements due to the influence of welding thermal deformation and the clamping force of the clamp.

In addition, the end plate and the side plate need to be disassembled for reworking and overhauling the battery module, the workload of removing the welding seam is large, the operation is complex, and the reworking difficulty is increased.

Therefore, a battery module and a battery pack are needed to solve the above problems.

SUMMERY OF THE UTILITY MODEL

An object of the present invention is to provide a battery module to improve the assembling quality and efficiency and reduce the assembling cost.

In order to achieve the purpose, the technical scheme adopted by the utility model is as follows:

the utility model provides a battery module, includes the electric core group of constituteing by a plurality of electricity core, battery module still includes:

the two combined end plates are oppositely arranged on two sides of the electric core pack along the length direction of the electric core pack, each combined end plate comprises a main end plate and an auxiliary end plate, the main end plate is provided with a clamping groove penetrating through the upper end of the main end plate, the auxiliary end plates are detachably arranged at the upper end of the main end plate, and the openings of the clamping grooves at the upper end of the main end plate are blocked;

the two side plates are oppositely arranged on two sides of the electric core group along the width direction of the electric core group; the both ends of curb plate all are provided with the locking piece, the locking piece with correspond the cooperation of pegging graft of draw-in groove, at least partial top surface of locking piece with the draw-in groove the opening parallel and level.

Further, the battery module further comprises a bus bar, a mounting groove is formed in the upper end of the auxiliary end plate, a fastening nut is fixedly arranged in the mounting groove, and the output end of the bus bar is locked to the fastening nut.

Furthermore, the auxiliary end plate is provided with a first mounting hole, the main end plate is correspondingly provided with a second mounting hole, and the fastener sequentially penetrates through the first mounting hole and the second mounting hole so as to fixedly mount the auxiliary end plate on the main end plate.

Furthermore, the battery module further comprises a top rod, a positioning hole is formed in the auxiliary end plate, splicing grooves are formed in the positions, close to the opening, of the two side walls, opposite to the clamping grooves, splicing grooves are formed in the positions, close to the opening, of the two side walls, the two splicing grooves surround a sliding hole opposite to the positioning hole, at least part of the top surface of the locking piece is recessed inwards to form a positioning groove, and the bottom surface of the positioning groove is coplanar with the bottom surface of the sliding hole; the ejector rod is arranged in the positioning hole in a sliding mode and extends into the sliding hole to abut against the bottom of the positioning groove.

Furthermore, the battery module further comprises an ejector rod, a positioning hole opposite to the clamping groove is formed in the auxiliary end plate, and the ejector rod is arranged in the positioning hole in a sliding mode and is abutted to at least part of the upper end of the locking piece.

Furthermore, the locking piece comprises an extension part and a limiting part, and two ends of the extension part are respectively connected with the side plate and the limiting part; the draw-in groove is including the first recess and the second recess of intercommunication, first recess be in the side of header plate have with the draw-in groove dodge the mouth of opening intercommunication, first recess with correspond the extension cooperation of pegging graft, the second recess with correspond spacing portion cooperation of pegging graft.

Furthermore, the extension part is a vertical plate, the limiting part is a baffle plate, and the vertical plate is vertically connected with the baffle plate to form a T-shaped structure.

Further, the extension part is a vertical plate, and the limiting part is a cylinder or a polygonal cylinder.

Further, the side plate and the locking piece are integrally formed in a bending mode.

Another object of the present invention is to provide a battery pack to improve the assembling quality and efficiency and reduce the assembling cost.

a battery pack comprises a battery box and the battery module, wherein the battery module is arranged in the battery box.

The utility model has the beneficial effects that:

according to the battery module and the battery pack provided by the utility model, the locking piece on the side plate is inserted into the main end plate from the opening of the clamping groove at the upper end of the main end plate, so that the insertion fit of the locking piece and the clamping groove is realized. After the auxiliary end plate and the main end plate are assembled into the combined end plate, the opening at the upper end of the main end plate is blocked, the locking piece is prevented from being separated from the clamping groove, and the reliable assembly of the side plate and the combined end plate is realized. Compared with a laser welding process, the combined end plate and the side plate are assembled in a splicing mode, structural deformation of the battery module caused by the welding process is avoided, and the assembling quality of the battery module is improved. The battery module is simple in structure and convenient to disassemble and assemble, welding and clamping operations are saved, assembling efficiency is improved, assembling cost is reduced, and reworking operation is facilitated.

Drawings

Fig. 1 is a schematic structural diagram of a battery module according to an embodiment of the present invention;

fig. 2 is an exploded view of a battery module according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a secondary endplate provided by an embodiment of the present invention;

FIG. 4 is an enlarged view of a portion of FIG. 2 at A;

fig. 5 is a partially enlarged view at B in fig. 2.

The component names and designations in the drawings are as follows:

1. a main end plate; 11. a card slot; 111. a first groove; 1111. splicing grooves; 112. a second groove; 12. a second mounting hole; 2. a secondary end plate; 21. a first mounting hole; 22. positioning holes; 23. mounting grooves; 3. a side plate; 31. a vertical plate; 311. positioning a groove; 32. a baffle plate; 4. a top rod; 5. and the electric core group.

Detailed Description

In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

The technical scheme of the utility model is further explained by the specific implementation mode in combination with the attached drawings.

The embodiment discloses a battery pack, and this battery pack includes battery box and battery module, and battery module installs in the battery box.

Current battery module mainly includes end plate, curb plate, electric core group and busbar, and a plurality of electric cores set up side by side and form electric core group. Two end plates are arranged at two ends of the arrangement direction of the electric core groups relatively, two side plates are arranged relatively, and the two side plates and the two end plates are enclosed to form a shell of the battery module.

In the battery module assembling process, the end plate and the side plate are positioned with high precision through the positioning tool fixture, and the end plate and the side plate are welded and connected by the laser welding equipment. Due to the fact that devices such as laser welding equipment and positioning tool fixtures are used, the assembly cost of the battery module is high, the assembly process is multiple, and efficiency is low. Moreover, the battery module is easily affected by welding and clamping to cause structural deformation, and the size after assembly molding is difficult to meet the quality requirement. In addition, because the end plate is connected with the side plate through welding, if reworking is carried out, operations such as welding seam excision, electric core group cleaning and the like need to be carried out, and the workload is large.

In order to solve the above problem, as shown in fig. 1 to 5, the present embodiment further discloses a battery module. The battery cell module comprises two combined end plates and two side plates 3 besides a battery cell group 5. Two combination end plates set up in the both sides of cell group 5 along its length direction relatively, and the combination end plate includes header plate 1 and vice end plate 2, and header plate 1 is seted up and is run through its upper end draw-in groove 11, and vice end plate 2 detachably sets up in header plate 1's upper end to shutoff draw-in groove 11 is in the opening of header plate 1 upper end. The two side plates 3 are oppositely arranged at two sides of the electric core group 5 along the width direction. Both ends of curb plate 3 all are provided with the locking piece, and the cooperation of pegging graft of locking piece and the draw-in groove 11 that corresponds, at least partial top surface of locking piece and the opening parallel and level of draw-in groove 11.

In this embodiment, the locking member on the side plate 3 is inserted into the main end plate 1 from the opening of the clamping groove 11 at the upper end of the main end plate 1, so that the locking member is inserted into the clamping groove 11. When the auxiliary end plate 2 and the main end plate 1 are assembled into a combined end plate, the auxiliary end plate 2 plugs the opening at the upper end of the main end plate 1, the locking piece is prevented from dropping off the clamping groove 11, and reliable assembly of the side plate 3 and the combined end plate is realized. For laser welding process, the combination end plate is assembled with the side plate 3 through splicing, so that structural deformation of the battery module caused by welding process is avoided, and the assembly quality of the battery module is improved. The battery module is simple in structure and convenient to disassemble and assemble, welding and clamping operations are saved, assembling efficiency is improved, assembling cost is reduced, and reworking operation is facilitated.

It should be noted that the battery module of this embodiment further includes bus bars (not shown in the drawings), and the bus bars are electrically connected to the corresponding poles on the upper end of the electric core assembly 5 respectively, so as to lead out the positive electrode and the negative electrode of the electric core assembly 5.

As shown in fig. 1, an installation groove 23 is formed at the upper end of the secondary end plate 2, a fastening nut is fixedly arranged in the installation groove 23, and the output end of the busbar is locked to the fastening nut. The positive output end and the negative output end of the bus bar are respectively arranged in the mounting grooves 23 of the two auxiliary end plates 2. Since the fastening nut is fixedly disposed in the mounting groove 23, frequent wiring may cause the fastening nut to slip. Because the combination end plate is split type design, can realize fastening nut's change through changing vice end plate 2, reduce the reworking degree of difficulty of replacement cost and combination end plate.

As shown in fig. 2 and 5, the secondary end plate 2 is provided with a first mounting hole 21, the main end plate 1 is correspondingly provided with a second mounting hole 12, and the fastener sequentially penetrates through the first mounting hole 21 and the second mounting hole 12 to fixedly mount the secondary end plate 2 on the main end plate 1.

The fastening member of this embodiment is a bolt, and the second mounting hole 12 is a threaded hole and is threadedly coupled to the fastening member. The first mounting hole 21 is a light hole. The main end plate 1 and the auxiliary end plate 2 are connected together by bolts.

In other alternative embodiments, the main end plate 1 and the auxiliary end plate 2 can be detachably connected by adhesion or magnetic attraction.

The both ends of curb plate 3 along its length direction of this embodiment are provided with the locking piece respectively, and the locking piece is connected in curb plate 3 perpendicularly to form U type structure. Specifically, the side plate 3 and the two locking pieces are integrally bent and formed, and processing and manufacturing are facilitated.

As shown in fig. 4 and 5, the locking member includes an extending portion and a limiting portion, and both ends of the extending portion are connected to the side plate 3 and the limiting portion, respectively. The clamping groove 11 comprises a first groove 111 and a second groove 112 which are communicated, the side face of the main end plate 1 of the first groove 111 is provided with an avoiding opening communicated with the opening of the clamping groove 11, the first groove 111 is in plug fit with the corresponding extending portion, the second groove 112 is in plug fit with the corresponding limiting portion, and reliable plug of the main end plate 1 and the side plate 3 is achieved. For current welded fastening mode, the main end plate 1 of this embodiment realizes dismantling the connection through pegging graft with curb plate 3, and grafting structure between them is simple, and the operation of being convenient for is favorable to improving the packaging efficiency of battery module.

Specifically, the extending portion is a vertical plate 31, the limiting portion is a baffle 32, and the vertical plate 31 is vertically connected with the baffle 32 to form a T-shaped structure. The cross section of the clamping groove 11 is correspondingly T-shaped. A catch 11 extends through the upper surface of the main endplate 1 to form an opening for insertion of a locking element. The first groove 111 has an avoidance port on the side of the main end plate 1 for avoiding the extension portion so as to facilitate insertion of the lock member.

The assembly process of the combined end plate and the side plate 3 comprises the following steps: the locking piece of the side plate 3 is inserted into the slot 11 from the opening at the upper end of the main end plate 1. Then, the sub-header 2 is fixed to the upper end of the main header 1 by bolts. The first groove 111 is in inserting fit with the vertical plate 31, and the second groove 112 is in inserting fit with the baffle 32, so that the limit of the side plate 3 in the horizontal direction is realized. Because the clamping groove 11 does not penetrate through the lower end of the main end plate 1, and the auxiliary end plate 2 blocks the opening of the clamping groove 11 at the upper end of the main end plate 1, the clamping groove 11 and the auxiliary end plate 2 jointly form the limit of the side plate 3 in the vertical direction, and therefore the reliable assembly of the combined end plate and the side plate 3 is realized.

In other alternative embodiments, the extending portion is a vertical plate 31, and the limiting portion may also be a cylinder or a polygonal cylinder. The structure of the second groove 112 can be adjusted adaptively according to the specific shape of the limiting portion.

It is noted that the main end plate 1 is a rectangular plate. The degree of depth looks adaptation of the height of lock piece and draw-in groove 11, when the lock piece was pegged graft with draw-in groove 11 and is cooperated, vice end plate 2 can support and press in the top surface of lock piece, avoids curb plate 3 to remove along vertical direction in draw-in groove 11, has realized the stability of being connected between combination end plate and the curb plate 3.

As shown in fig. 3 and 5, two second mounting holes 12 are formed in the main end plate 1, the two second mounting holes 12 are respectively close to the clamping grooves 11 at the two ends, and two first mounting holes 21 are correspondingly formed in the auxiliary end plate 2. The locking positions of the main end plate 1 and the auxiliary end plate 2 are close to the clamping groove 11, so that the pressure of the auxiliary end plate 2 on the locking piece is improved. Of course, the number of the second mounting holes 12 may also be one, three or more.

Because there is machining error in main end plate 1, vice end plate 2 and locking piece, after the equipment of combination end plate and curb plate 3 was accomplished, there may be the clearance between the lower surface of vice end plate 2 and the top surface of locking piece for curb plate 3 can remove along vertical direction in draw-in groove 11, and the structural stability who leads to battery module is relatively poor, takes place to warp easily.

For solving above-mentioned problem, the battery module of this embodiment still includes ejector pin 4, supports through ejector pin 4 and presses in the top surface of locking piece, has realized that the locking piece is spacing in the reliable of vertical direction.

As shown in fig. 4 and 5, the assistant end plate 2 is provided with a positioning hole 22, two side walls opposite to the slot 11 are provided with splicing grooves 1111 near the opening, and the two splicing grooves 1111 surround a sliding hole opposite to the positioning hole 22. The slide hole of this embodiment is formed only in the first groove 111, and two side walls of the first groove 111 along the width direction thereof are recessed inward at the opening portions near the upper end of the main end plate 1 to form the splice grooves 1111, respectively.

The ejector rod 4 of the embodiment is a bolt, and is cheap and easy to obtain. The positioning holes 22 correspond to threaded holes. Of course, the top bar 4 may be a pin or the like. Because ejector pin 4 is the bolt, the slide opening is the circular port that can be with ejector pin 4 looks adaptation. Specifically, the splice groove 1111 is an arc groove, and the two arc grooves are disposed opposite to each other and form a sliding hole.

As shown in fig. 4, at least a portion of the top surface of the locking member is recessed to form a detent 311, and the bottom of the detent 311 is coplanar with the bottom surface of the slide opening. The ejector rod 4 is slidably disposed in the positioning hole 22 and extends into the sliding hole to abut against the bottom of the positioning groove 311, so that the locking member is vertically limited.

Specifically, a part of the top surface of the vertical plate 31 is recessed inwards to form a positioning slot 311, and when the locking member is in plug-in fit with the card slot 11, the bottom of the positioning slot 311 is coplanar with the bottoms of the two splicing slots 1111. The top rod 4 is in threaded connection with the positioning hole 22, and the top rod 4 is pressed against the bottom of the positioning groove 311 by screwing the top rod 4.

In other alternative embodiments, the slide hole may also be formed only in the second groove 112 or between the first groove 111 and the second groove 112. For example, a slide hole is formed in the second groove 112, at least a portion of the top surface of the shutter 32 is recessed inward to form a positioning groove 311, and the bottom surface of the positioning groove 311 is coplanar with the bottom surface of the slide hole. Alternatively, the sliding hole is formed between the first groove 111 and the second groove 112, and the positioning slot 311 is formed on the baffle 32 and the vertical plate 31.

The upper end of the locking piece of this embodiment has a stair structure, supports respectively through end plate 2 and ejector pin 4 and presses in two ladder faces of stair structure, has realized the dual location to the locking piece, has avoided curb plate 3 to take place to reciprocate in vertical direction, has improved the structural strength and the stability of battery module.

It should be noted that the bottom of the positioning slot 311 can be higher than the bottom of the splicing slot 1111, so that the ejector rod 4 can be reliably pressed against the locking member.

In other alternative embodiments, the secondary end plate 2 is provided with a positioning hole 22 opposite to the slot 11, and the push rod 4 is slidably disposed in the positioning hole 22 to press against at least a portion of the upper end of the locking member. The locking member in this embodiment may also be formed without forming the positioning slot 311, and only the top rod 4 passes through the positioning hole 22 and presses against a part of the top surface of the locking member. At this time, the pressing end of the ejector rod 4 is not in contact with the upper surface of the main end plate 1, so as to avoid interference.

The foregoing embodiments are merely illustrative of the principles and features of this invention, which is not limited to the above-described embodiments, but rather is susceptible to various changes and modifications without departing from the spirit and scope of the utility model, which changes and modifications are within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a battery module, includes the electric core group of constituteing by a plurality of electricity cores, its characterized in that, battery module still includes:

2. The battery module according to claim 1, further comprising a bus bar, wherein an installation groove is formed in the upper end of the secondary end plate, a fastening nut is fixedly arranged in the installation groove, and the output end of the bus bar is locked to the fastening nut.

3. The battery module as recited in claim 1, wherein the secondary end plate defines a first mounting hole, the primary end plate defines a second mounting hole, and a fastener is sequentially inserted through the first mounting hole and the second mounting hole to fixedly mount the secondary end plate on the primary end plate.

4. The battery module according to claim 3, wherein the battery module further comprises a top rod, the secondary end plate is provided with a positioning hole, two side walls of the clamping groove, which are oppositely arranged, are provided with splicing grooves at positions close to the opening, the splicing grooves enclose a sliding hole opposite to the positioning hole, at least part of the top surface of the locking piece is recessed inwards to form a positioning groove, and the bottom surface of the positioning groove is coplanar with the bottom surface of the sliding hole; the ejector rod is arranged in the positioning hole in a sliding mode and extends into the sliding hole to abut against the bottom of the positioning groove.

5. The battery module as recited in claim 3, further comprising a post, wherein the secondary end plate is provided with a positioning hole opposite to the engaging groove, and the post is slidably disposed in the positioning hole to abut against at least a portion of the upper end of the locking member.

6. The battery module according to claim 1, wherein the locking member comprises an extending portion and a limiting portion, and two ends of the extending portion are respectively connected with the side plate and the limiting portion; the draw-in groove is including the first recess and the second recess of intercommunication, first recess be in the side of header plate have with the draw-in groove dodge the mouth of opening intercommunication, first recess with correspond the extension cooperation of pegging graft, the second recess with correspond spacing portion cooperation of pegging graft.

7. The battery module according to claim 6, wherein the extending portion is a vertical plate, the limiting portion is a baffle plate, and the vertical plate is vertically connected with the baffle plate and forms a T-shaped structure.

8. The battery module according to claim 6, wherein the extending portion is a vertical plate, and the limiting portion is a cylinder or a polygonal cylinder.

9. The battery module according to any one of claims 1 to 8, wherein the side plate and the locking member are integrally formed by bending.

10. A battery pack, comprising a battery case and the battery module according to any one of claims 1 to 9, the battery module being mounted in the battery case.