CN211125716U

CN211125716U - Lithium battery module

Info

Publication number: CN211125716U
Application number: CN201921813391.3U
Authority: CN
Inventors: 刘昌�
Original assignee: Hangzhou Qiandai Technology Co ltd
Current assignee: Hangzhou Qiandai Technology Co ltd
Priority date: 2019-09-20
Filing date: 2019-10-25
Publication date: 2020-07-28
Anticipated expiration: 2029-10-25

Abstract

The application discloses lithium battery module 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 beneficial effect of this application lies in providing one kind through welded structure and middle gasket's improvement thereby improve the lithium cell module of electric core unit equilibrium.

Description

Lithium battery module

Technical Field

The application relates to a battery module, particularly, relates to a lithium battery module.

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 battery module and then is supplemented with a peripheral circuit to form a battery pack which can be used independently.

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

If chinese patent document CN208093630U describes a lithium battery module, which uses an aluminum strip to electrically connect each parallel battery cell in a series unit, and then uses an external electrical connection structure to connect each series unit in series, such a connection would cause the imbalance of the parallel battery cells in a series unit, and thus cause the deterioration of some battery cells, which affects the life of the series unit, and thus reduces the utilization rate of the battery cells in a better state.

Disclosure of Invention

A lithium battery module, comprising: a plurality of terminal parts provided at both ends of the lithium battery module such that the lithium battery module is constructed as a whole; the assembling units are arranged between the end parts so as to enable the lithium 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; the middle gasket is arranged on the outer side of the unit bracket and forms surface contact with the middle gasket of the adjacent assembly unit; a cell bonding wire electrically connecting an end of the cell unit 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 part of the battery cell unit is exposed out of the middle gasket, the edge of the gasket through hole of the middle gasket is provided with an inner welding wire groove sunken towards the inner part of the middle gasket, 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 hole to be welded to the middle gasket and is positioned in the inner welding wire groove.

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 lithium battery module still includes: assembling a bolt and a nut;

the unit bracket is provided with a plurality of assembling through holes so that the assembling bolts or the assembling nuts pass through or are accommodated in the assembling through holes, and the assembling through holes are stepped holes.

The application has the advantages that:

provided is a lithium battery module having improved cell unit balance through improvement of a welding structure and a middle gasket.

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 battery module according to an embodiment of the present application;

fig. 2 is a schematic structural view of an assembly unit of the lithium battery module in the embodiment shown in fig. 1;

fig. 3 is a partial exploded view of an assembled unit of the lithium battery cell module in the embodiment shown in fig. 1;

fig. 4 is a further exploded view of an assembled unit of the lithium battery cell module in the embodiment shown in fig. 1;

fig. 5 is a schematic end view of the lithium battery module in the embodiment shown in fig. 1;

FIG. 6 is an enlarged view of a portion of FIG. 5;

FIG. 7 is an enlarged view of another portion of FIG. 5;

fig. 8 is a sectional view of a section of the lithium battery cell module in the embodiment shown in fig. 1;

fig. 9 is a sectional view of another section of the lithium battery cell module in the embodiment shown in fig. 1;

fig. 10 is a schematic structural view of a lithium battery module according to another embodiment of the present application;

fig. 11 is a case assembly of a battery pack capable of being matched with the lithium battery module shown in fig. 9;

fig. 12 is a schematic structural view of the assembled lithium battery module shown in fig. 9 and the case assembly shown in fig. 11.

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 9, a lithium battery module 100 of the present application includes: two end pieces 101 and several assembly units 102.

Wherein two terminal parts 101 are provided at both ends of the lithium battery module 100 so that the lithium battery module 100 is constructed as a single body. The two end pieces 101 may be formed with snap 117 formations on their peripheries so that they can be quickly made up for connection.

The assembly unit 102 is disposed between the terminal members 101 to enable the lithium battery module 100 to realize a reserve of electric power. The number of assembly units 102 to be assembled between the two end pieces 101 can be determined according to specific requirements.

Specifically, the assembly unit 102 includes: a plurality of cell units 103, two unit brackets 104, and two middle gaskets 105. The assembly unit 102 further includes a number of cell bonding wires 106.

The battery cell unit 103 is configured to store electric energy, and as a specific option, a 18650 standard battery cell may be selected as the battery cell unit 103.

The two unit supports 104 are arranged oppositely, and are mainly used for fixing the battery cell units 103, and the two unit supports 104 form a matching structure and enable the two unit supports and the battery cell units 103 between the two unit supports to form an assembled whole.

As a point of improvement, the middle pad 105 is mainly used to realize the series electrical connection between the different assembly units 102, so that the different assembly units 102 can be combined into a whole and can also form a balanced electrical connection. Also, the cell bonding wire 106 electrically connects the end of the cell unit 103 to the middle spacer 105.

Specifically, the intermediate gasket 105 is provided outside the unit bracket 104 and in surface contact with the intermediate gasket 105 of the adjacent assembly unit 102; the cell unit 103 is arranged between the two cell supports 104, the cell supports 104 are provided with a plurality of positioning grooves 107, and two ends of the cell unit 103 are embedded in the positioning grooves 107; the unit support 104 is provided with a plurality of support through holes 108 at positions corresponding to the plurality of positioning grooves 107 so that the end parts of the cell units 103 are exposed out of the unit support 104; the middle gasket 105 is provided with a plurality of gasket through holes 109 at positions corresponding to the bracket through holes 108 so that the end portions of the cell units 103 are exposed out of the middle gasket 105, the middle gasket 105 is provided with an inner wire groove 110 recessed towards the inside of the middle gasket 105 at the edge of the gasket through hole 109, one end of a cell wire 106 is welded to the end portion of the cell unit 103, and the other end of the cell wire 106 penetrates through the bracket through hole 108 and the gasket through hole 109 to be welded to the middle gasket 105 and is located in the inner wire groove 110.

It should be noted that the cell bonding wires 106 may be bonded to the end portions of the cell units 103 and the middle spacer 105 by using an aluminum wire bonding process.

In this way, the cells of the same assembly unit 102 are connected in parallel by the cell bonding wires 106 and the middle gaskets 105, and the different assembly units 102 are connected in series by the contact of the middle gaskets 105, and since the middle gaskets 105 cover the regions of all the cell units 103 and are electrically connected by the surface contact, all the cell units 103 are balanced in the specific charging and discharging process, thereby improving the conventional defects.

Specifically, the cell units 103 are substantially a solid of revolution, such as a cylinder, and all the cell units 103 are arranged in parallel, where parallel means that the axes of revolution of the cell units 103 are parallel. As a further preferred scheme, the support through hole 108 is a circular hole and the center of the circular hole is located on the rotation axis of the cell unit 103, and similarly, the gasket through hole 109 is a circular hole and the center of the circular hole is also located on the rotation axis of the cell unit 103, that is, the gasket through hole 109 is a circular hole concentric with the support through hole 108.

As a further specific solution, the inner wire groove 110 is located on the side of the gasket through hole 109, and its shape constitutes mirror symmetry with respect to one axis of symmetry. The inner wire grooves 110 are all provided at the same relative position of the pad through hole 109.

When the pad through-hole 109 is a circular hole, the inner wire groove 110 is symmetrical with respect to one diameter of the pad through-hole 109 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 105 located on the outer side is aligned with the end face of the cell holder 104 or located on the inner side of the end face of the cell holder 104. This prevents the cell bonding wires 106 from protruding beyond the end surfaces of the unit brackets 104.

In order to facilitate detection, a plurality of outer welding wire grooves 111 which are sunken towards the inside of the middle gasket 105 are formed in the edge of the middle gasket 105; the edge of the unit bracket 104 is provided with a routing notch 112 corresponding to the position of the outer wire bonding groove 111. This allows the desired electrical signal to be obtained through the lead 118 soldered within the outer wire groove 111.

As a further specific solution, the end face of the unit bracket 104 is provided with a seating groove 113, and the middle gasket 105 is embedded in the seating groove 113. Further, as one of the solutions, the unit bracket 104 is provided with a bracket mounting hole 120, the intermediate gasket 105 is at least partially embedded in the bracket mounting hole 120 and forms an internally threaded hole, and then the intermediate gasket 105 is mounted at the end face of the unit bracket 104 by a mounting screw 119 screwed into the internally threaded hole. In addition, when the assembly unit 102 is butted, in order to accommodate the nut of the mounting screw, the center pad and the unit bracket 104 are butted to form a hole structure for accommodating the nut.

As a further specific scheme, the lithium battery module 100 further includes: an assembly bolt 114 and an assembly nut 115; the unit bracket 104 is provided with a plurality of assembly through holes 116 such that the assembly bolts 114 or the assembly nuts 115 pass through or are received in the assembly through holes 116, the assembly through holes 116 being stepped holes. Similarly, the middle spacer 105 is provided with a through hole corresponding to the position of the assembly through hole 116 in order to provide a space for passing.

Alternatively, the assembly bolt 114 and the assembly nut 115 may be made of conductive metal material, so as to conduct a large current based on the conductivity of the intermediate gasket 105.

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 lithium battery module, comprising:

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

the assembling units are arranged between the end parts so as to enable the lithium 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;

the middle gasket is arranged on the outer side of the unit bracket and forms surface contact with the middle gasket of the adjacent assembly unit;

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 part of the battery cell unit is exposed out of the middle gasket, the edge of the gasket through hole of the middle gasket is provided with an inner welding wire groove sunken towards the inner part of the middle gasket, 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 hole to be welded to the middle gasket and is positioned in the inner welding wire groove.

2. The lithium battery module as claimed in claim 1, wherein:

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

3. The lithium battery module as claimed in 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 lithium battery module as claimed in claim 3, wherein:

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

5. The lithium battery module as claimed in 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 lithium battery module as claimed in 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 lithium battery module as claimed in 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 lithium battery module as claimed in 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 lithium battery module as claimed in claim 8, wherein:

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

10. The lithium battery module as claimed in claim 1, wherein:

the lithium battery module further comprises: assembling a bolt and a nut;