CN211125717U

CN211125717U - Battery pack

Info

Publication number: CN211125717U
Application number: CN201921814037.2U
Authority: CN
Inventors: 刘昌�
Original assignee: Hangzhou Qiandai Technology Co ltd
Current assignee: Hangzhou Zhirong Technology Co.,Ltd.
Priority date: 2019-09-20
Filing date: 2019-10-25
Publication date: 2020-07-28
Anticipated expiration: 2029-10-25
Also published as: CN111416144B; CN111416144A; CN111416094B; CN211125719U; CN111416094A

Abstract

The application discloses battery package includes: an end piece and an assembly unit; the assembly unit includes: the battery cell unit, the unit bracket, the middle gasket and the battery cell welding wire; the cell unit is arranged between the two cell supports, and the cell supports are provided with a plurality of support through holes at positions corresponding to the plurality of positioning grooves so that the end parts of the cell unit are exposed out of the cell supports; the middle gasket is provided with a plurality of gasket through holes at positions corresponding to the support through holes so that the end part of the battery cell unit is exposed out of the middle gasket, the middle gasket is provided with an inner welding wire groove sunken towards the inside of the middle gasket at the edge of the support through hole, one end of a battery cell welding wire is welded to the end part of the battery cell unit, and the other end of the battery cell welding wire penetrates through the support through hole and the gasket through holes to be welded to the middle gasket and is positioned in the inner welding wire groove. The end piece is provided with a clamping groove which can be matched with a box body clamping block of the battery pack. It is advantageous to provide a battery pack in which the installation convenience of the battery module is improved by the improvement of the structure of the end members.

Description

Battery pack

Technical Field

The application relates to a battery pack, in particular to a battery pack capable of being assembled quickly.

Background

The lithium battery is a battery which uses lithium metal or lithium alloy as a negative electrode material and uses a non-aqueous electrolyte solution, the lithium metal battery is firstly proposed and researched by Gilbert N. L ewis in 1912, and in the 70 th century, the lithium battery is proposed and researched by M.S. Whittingham.

With the further development of science and technology, lithium batteries have become very important electric energy sources in the fields of new energy automobiles and the like, and a single battery cell is often packaged into a lithium ion battery module and then is supplemented with peripheral circuits to form a battery pack which can be used independently.

In the description of the related documents, the assembly of the lithium ion battery module is often inconvenient and complicated for forming electrical connection with the battery cell.

If the lithium ion battery module described in chinese patent document CN208093630U is configured to electrically connect the parallel cells in one series unit through the aluminum strip, and then connect the series units in series through the external electrical connection structure, such a connection manner may cause the parallel cells in one series unit to generate an imbalance condition, thereby causing a part of the cells to be deteriorated first, and affecting the life of the series unit, thereby reducing the utilization rate of the cells in a better state.

Meanwhile, the problem of complex assembly of the existing battery pack of the lithium battery exists.

Disclosure of Invention

A battery pack, comprising: the lithium ion battery pack comprises a box body assembly and a lithium ion battery module arranged in the box body; wherein, the lithium ion battery module includes: a plurality of terminal parts provided at both ends of the lithium ion battery module so that the lithium ion battery module is constructed as a whole; the assembling units are arranged between the end parts so as to enable the lithium ion battery module to realize electric energy storage; the assembly unit includes: the battery cell units are used for storing electric energy; the two unit brackets are used for fixing the battery cell units; a middle gasket disposed at an outer side of the unit bracket and formed with a side edge portion bent toward a side surface of the unit bracket; the connecting gasket is used for connecting two adjacent side edge parts; a plurality of cell bonding wires electrically connecting the end portions of the cell units to the middle gasket; the cell unit is arranged between the two unit supports, the unit supports are provided with a plurality of positioning grooves, and two ends of the cell unit are embedded into the positioning grooves; the unit support is provided with a plurality of support through holes at positions corresponding to the positioning grooves so that the end parts of the electric core units are exposed out of the unit support; the middle gasket is provided with a plurality of gasket through holes at positions corresponding to the support through holes so that the end parts of the cell units are exposed out of the middle gasket, the middle gasket is provided with an inner welding wire groove which is sunken towards the inner part of the middle gasket at the edge of the support through hole, one end of one cell welding wire is welded to the end part of the cell unit, and the other end of the cell welding wire penetrates through the support through hole and the gasket through hole to be welded to the middle gasket and is positioned in the inner welding wire groove; the connecting gasket is arranged on the side surface of the whole formed by the battery cell unit and the unit bracket; the end part is provided with a plurality of clamping grooves which are arranged in a parallel mode, and the extending direction of each clamping groove is perpendicular to the axial direction of the cell unit; the box subassembly includes: the box body is used for accommodating the lithium ion battery module; the clamping block is inserted into the clamping groove to fix the lithium ion battery module; the clamping blocks are at least arranged on two opposite sides in the box body. Further, the battery cell units are substantially revolved bodies, and the battery cell units are all arranged in parallel.

Furthermore, the support through hole is a circular hole, and the circle center of the support through hole is located on the rotation axis of the battery cell unit.

Further, the gasket through holes are circular holes concentric with the bracket through holes.

Further, the end face of the middle gasket located on the outer side is aligned with or located on the inner side of the end face of the unit bracket.

Furthermore, a plurality of outer welding wire grooves which are sunken towards the inside of the middle gasket are arranged at the edge of the middle gasket; and routing notches are formed in the edges of the unit supports corresponding to the positions of the outer welding wire grooves.

Furthermore, the end face of the unit bracket is provided with a placement groove, and the middle gasket is embedded in the placement groove.

Further, the inner wire groove is located on one side of the gasket through hole, and the shape of the inner wire groove is mirror-symmetrical relative to a symmetry axis.

Further, the inner wire grooves are all arranged at the same relative position of the gasket through holes.

Further, the unit brackets are provided with protruding structures or recessed structures so that they can be engaged with adjacent protruding structures or recessed structures; the middle gasket is provided with a hollow hole which can enable the protruding structure to pass through.

The application has the advantages that:

there is provided a battery pack in which the installation convenience of a battery module is improved by the improvement of the structure of the terminal member.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, serve to provide a further understanding of the application and to enable other features, objects, and advantages of the application to be more apparent. The drawings and their description illustrate the embodiments of the invention and do not limit it. In the drawings:

fig. 1 is a schematic structural diagram of a lithium ion battery module according to an embodiment of the present application;

fig. 2 is a partial exploded view of an assembled unit of the battery module in the embodiment of fig. 1;

FIG. 3 is a schematic view of the structure of the middle pad of FIG. 2;

FIG. 4 is a schematic structural view of the unit bracket of FIG. 2;

FIG. 5 is a schematic view of the unit bracket of FIG. 2 from another perspective;

FIG. 6 is a schematic view of a mounting connection pad of the assembled unit of FIG. 2;

FIG. 7 is a schematic view of the assembled unit of FIG. 6 after installation;

fig. 8 is a partially enlarged structural view illustrating an assembly unit of the battery module in the embodiment of fig. 1;

fig. 9 is a partially enlarged cross-sectional structural view of the battery module in the embodiment shown in fig. 1;

fig. 10 is a partially enlarged cross-sectional structural view of another cross section of the battery module in the embodiment shown in fig. 1;

fig. 11 is a schematic structural diagram of a lithium ion battery module according to another embodiment of the present application;

FIG. 12 is a battery pack housing assembly that can be mated with the lithium ion battery module of FIG. 11;

fig. 13 is a schematic structural view of the assembled lithium ion battery module shown in fig. 11 and the case assembly shown in fig. 12.

Detailed Description

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.

Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.

Furthermore, the terms "mounted," "disposed," "provided," "connected," and "sleeved" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

As shown in fig. 1 to 10, a lithium ion battery module 300 of the present application includes: two end pieces 301 and several assembly units 302.

Wherein two end parts 301 are provided at both ends of the lithium ion battery module 300 so that the lithium ion battery module 300 is constructed as a single body. The two end pieces 301 may be formed with snap 317 formations on their peripheries so that they can be quickly made up for connection.

The assembly unit 302 is disposed between the end members 201 to enable the lithium ion battery module 200 to realize an electric energy reserve. The number of assembly units 302 to be assembled between the two end pieces 301 can be determined according to specific requirements.

Specifically, the assembly unit 302 includes: a plurality of cell units 303, two unit brackets 304, and two intermediate gaskets 305. The assembly unit 302 also includes a number of cell wire bonds 306.

The cell unit 303 is configured to store electric energy, and as a specific option, a 18650 standard cell may be selected as the cell unit 303.

The two unit supports 304 are arranged oppositely, and are mainly used for fixing the cell units 303, and the two unit supports 304 form a matching structure and enable the cell units 303 and the plurality of cell units 303 between the cell units to form an assembled whole.

As a point of improvement, the middle pad 305 is mainly used to realize the series electrical connection between the different assembly units 302, so that the different assembly units 302 can be combined into a whole and can also form a balanced electrical connection. Also, the cell bonding wire 306 electrically connects the end of the cell unit 203 to the middle spacer 305.

Specifically, the intermediate gasket 305 is provided outside the unit holder 304 and in surface contact with the intermediate gasket 305 of the adjacent assembly unit 302; the battery cell unit 303 is arranged between the two unit brackets 304, the unit brackets 304 are provided with a plurality of fixing grooves 307, and two ends of the battery cell unit 303 are embedded in the fixing grooves 307; the unit bracket 304 is provided with a plurality of bracket through holes 308 at positions corresponding to the plurality of fixing grooves 307 so that the end parts of the electric core units 303 are exposed out of the unit bracket 304; the middle gasket 305 is provided with a plurality of gasket through holes 309 at positions corresponding to the bracket through holes 308 so that the end portions of the cell units 303 are exposed out of the middle gasket 305, the middle gasket 305 is provided with an inner wire groove 210 recessed towards the inside of the middle gasket 305 at the edge of the gasket through hole 309, one end of a cell wire 306 is welded to the end portion of the cell unit 303, and the other end of the cell wire 306 penetrates through the bracket through hole 308 and the gasket through hole 309 to be welded to the middle gasket 305 and is located in the inner wire groove 310.

It should be noted that the cell bonding wires 306 may be bonded to the end portions of the cell units 303 and the middle spacers 305 by using an aluminum wire bonding process.

In this way, the cells of the same assembly unit 302 are connected in parallel by the cell bonding wire 306 and the intermediate gasket 305, and the different assembly units 302 are connected in series by the contact of the intermediate gasket 305, so that the intermediate gasket 305 covers the area of all the cell units 303 and is electrically connected by the surface contact, thereby improving the conventional defects.

Specifically, the cell units 303 are substantially a solid of revolution, such as a cylinder, and all the cell units 303 are arranged in parallel, where parallel refers to the rotation axes of the cell units 303 being parallel. As a further preferable scheme, the support through hole 308 is a circular hole and the center of the circular hole is located on the rotation axis of the cell unit 303, and similarly, the gasket through hole 309 is a circular hole and the center of the circular hole is also located on the rotation axis of the cell unit 303, that is, the gasket through hole 309 is a circular hole concentric with the support through hole 308.

As shown in fig. 5, the size of the holder through-hole 308 is smaller than that of the fixing groove 307, so that a stopper surface 307a is formed between the holder through-hole 308 and the fixing groove 307, thereby allowing the cell unit 303 to be exposed from the holder through-hole 308 and supporting and fixing the cell unit 303.

As a further specific solution, the inner wire groove 310 is located on the side of the gasket through hole 309, and its shape constitutes mirror symmetry with respect to one axis of symmetry. The inner wire grooves 310 are all disposed at the same relative position of the pad through hole 309.

When the pad through-hole 309 is a circular hole, the inner wire groove 310 is symmetrical with respect to one diameter of the pad through-hole 309 and is located on one side of a line on which the other diameter perpendicular to the one diameter is located.

As a further concrete measure, the end face of the intermediate spacer 305 located on the outer side is aligned with the end face of the cell holder 304 or located on the inner side of the end face of the cell holder 304. This prevents the cell bonding wires 306 from protruding beyond the end faces of the unit brackets 304.

In order to facilitate detection, a plurality of outer welding wire grooves 311 which are recessed towards the inside of the middle gasket 305 are formed in the edge of the middle gasket 305; the edge of the unit bracket 304 is provided with a routing notch 312 at a position corresponding to the outer wire bonding groove 311. This allows the desired electrical signal to be obtained through the lead 318 soldered within the outer wire groove 311.

As a further specific solution, the end face of the unit bracket 304 is provided with a seating groove 313, and the middle gasket 305 is embedded in the seating groove 313.

Specifically, the intermediate gasket 305 is formed with side edges 319, the side edges 319 are disposed outside the unit bracket 304, and the side edges 319 are bent toward the side of the unit bracket 304; the side edge portions 319 are not formed entirely with the entire edge of the middle gasket 305 but are formed only at the central portion of the middle gasket 305, and the side edge portions 319 are provided with two side edge holes 322.

A single side bar 323 is provided at a position corresponding to the side edge portion 319 outside the unit bracket 304, and the single side bar 323 is formed with a single side groove 324.

Specifically, the assembly unit 302 further includes a connection pad 320, and the connection pad 320 is used for connecting two adjacent side edges 319. More specifically, opposite sides of the connection pad 320 are formed with edge-inserting portions 320a, the edge-inserting portions 320a can be inserted into the single-sided grooves 324 of the single-sided strip 323 so that the connection pad 320 is at least partially positioned inside the side portions 319, the side holes 322 are provided as threaded holes, and the ends of the locking bolts 321 are locked in position of the connection pad 320 by contacting the connection pad 320 after being screwed into the side holes 322. By adopting the connection gasket 320, the locking bolt 321 can not directly contact the unit bracket 304, so that the unit bracket 304 is not damaged due to locking, and thus, the unit bracket 304 can be used after the battery cell 303 in the assembly unit 302 is replaced, and only the connection gasket 320 is replaced, so that the utilization rate and the universality of the unit bracket 304 and the battery cell 303 are greatly improved.

The connection pad 320 is preferably made of an insulating material, and the connection pad 320 may preferably be made of a resin material.

Specifically, in order to enable the unit bracket 304 to position the middle spacer 305, the unit bracket 304 is formed with a plurality of positioning protrusions 314 and positioning grooves 315, the positioning protrusions 314 and the positioning grooves 315 of two adjacent unit brackets 304 are matched with each other, the positioning protrusion 314 of one unit bracket 304 is embedded in the positioning groove 315 of the other unit bracket 304, the middle spacer 305 is provided with a hollow hole 316 through which the positioning protrusion can pass, specifically, the shapes of the positioning protrusion 314, the positioning groove 315 and the hollow hole 316 are matched with each other, and after the positioning protrusion 314 is inserted into the positioning groove 315, the positioning protrusion 314 passes through the hollow hole 316, so that the middle spacer 305 can be positioned.

Preferably, the positioning protrusion 314, the positioning groove 315 and the hollow hole 316 are formed in a cross shape.

Fig. 9 shows another embodiment of a lithium ion battery module 300 ', which differs from the previously described solutions in that the end piece 301 of the lithium ion battery module 300' is formed with two parallel snap grooves 325, and the extending direction of the snap grooves 325 is perpendicular to the axial direction of the cell unit 303.

Fig. 10 and 11 show a case assembly that can constitute a battery pack 327, including a case 328 and a snap block 326 fixedly mounted therein. The case 328 is used to house the lithium ion battery modules, and the clamping blocks are used to insert into the clamping slots to position the lithium ion battery modules.

When the battery pack 327 is assembled (not shown), the engaging blocks 326 are inserted into the engaging grooves 325, so that the lithium ion battery module 300' can be mounted inside the case 328 without using bolts or welding.

The snap blocks 326 are disposed on opposite sides of the interior of the housing 328. The case 328 may be substantially constructed as a rectangular body.

As an extension, the snap groove 325 or the snap block 326 may be configured with a slope so that they are more and more tightly combined as the insertion progresses during the docking.

By adopting the preparation method, the middle gasket can effectively conduct current and has enough structural strength. The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery pack, comprising:

the lithium ion battery pack comprises a box body assembly and a lithium ion battery module arranged in the box body;

wherein, the lithium ion battery module includes:

a plurality of terminal parts provided at both ends of the lithium ion battery module so that the lithium ion battery module is constructed as a whole;

the assembling units are arranged between the end parts so as to enable the lithium ion battery module to realize electric energy storage;

the method is characterized in that:

the assembly unit includes:

the battery cell units are used for storing electric energy;

the two unit brackets are used for fixing the battery cell units;

a middle gasket disposed at an outer side of the unit bracket and formed with a side edge portion bent toward a side surface of the unit bracket;

the connecting gasket is used for connecting two adjacent side edge parts;

a plurality of cell bonding wires electrically connecting the end portions of the cell units to the middle gasket;

the cell unit is arranged between the two unit supports, the unit supports are provided with a plurality of positioning grooves, and two ends of the cell unit are embedded into the positioning grooves; the unit support is provided with a plurality of support through holes at positions corresponding to the positioning grooves so that the end parts of the electric core units are exposed out of the unit support; the middle gasket is provided with a plurality of gasket through holes at positions corresponding to the support through holes so that the end parts of the cell units are exposed out of the middle gasket, the middle gasket is provided with an inner welding wire groove which is sunken towards the inner part of the middle gasket at the edge of the support through hole, one end of one cell welding wire is welded to the end part of the cell unit, and the other end of the cell welding wire penetrates through the support through hole and the gasket through hole to be welded to the middle gasket and is positioned in the inner welding wire groove; the connecting gasket is arranged on the side surface of the whole formed by the battery cell unit and the unit bracket;

the end part is provided with a plurality of clamping grooves which are arranged in a parallel mode, and the extending direction of each clamping groove is perpendicular to the axial direction of the cell unit;

the box subassembly includes:

the box body is used for accommodating the lithium ion battery module;

the clamping block is inserted into the clamping groove to fix the lithium ion battery module;

the clamping blocks are at least arranged on two opposite sides in the box body.

2. The battery pack according to claim 1, wherein:

the battery cell units are substantially revolved bodies and are all arranged in parallel.

3. The battery pack according to claim 2, wherein:

the support through hole is a circular hole, and the circle center of the support through hole is located on the rotating axis of the battery cell unit.

4. The battery pack according to claim 3, wherein:

the gasket through holes are circular holes concentric with the support through holes.

5. The battery pack according to claim 1, wherein:

the end face of the middle gasket located at the outer side is aligned with the end face of the unit bracket or located at the inner side of the end face of the unit bracket.

6. The battery pack according to claim 5, wherein:

a plurality of outer welding wire grooves which are sunken towards the inner part of the middle gasket are arranged at the edge of the middle gasket; and routing notches are formed in the edges of the unit supports corresponding to the positions of the outer welding wire grooves.

7. The battery pack according to claim 6, wherein:

the end face of the unit support is provided with a placement groove, and the middle gasket is embedded into the placement groove.

8. The battery pack according to claim 1, wherein:

the inner welding wire groove is positioned on one side of the gasket through hole, and the shape of the inner welding wire groove is mirror symmetry relative to a symmetry axis.

9. The battery pack according to claim 8, wherein:

the inner welding wire grooves are all arranged at the same relative position of the gasket through holes.

10. The battery pack according to claim 1, wherein:

the unit brackets are provided with positioning bulges or positioning grooves so that the positioning bulges or the positioning grooves can be matched with the positioning grooves or the positioning bulges of the adjacent unit brackets; the middle gasket is provided with a hollow hole through which the positioning protrusion can pass.