CN216389485U

CN216389485U - Lithium ion battery module

Info

Publication number: CN216389485U
Application number: CN202123212265.2U
Authority: CN
Inventors: 付垚; 马训振; 俞会根
Original assignee: Beijing WeLion New Energy Technology Co ltd
Current assignee: Beijing WeLion New Energy Technology Co ltd
Priority date: 2021-12-20
Filing date: 2021-12-20
Publication date: 2022-04-26
Anticipated expiration: 2031-12-20

Abstract

The embodiment of the utility model provides a lithium ion battery module which comprises a plurality of assembled and connected battery cell assemblies, wherein each battery cell assembly comprises a battery cell body and an assembled bracket arranged on the battery cell body; the assembling connection of the battery cell assembly comprises transverse connection along the width direction of the battery cell body and/or longitudinal connection along the length direction of the battery cell body. The assembling support on the cell body is used for realizing the free assembling connection of the plurality of cell assemblies, and the assembling connection of the cell assemblies comprises transverse connection along the width direction of the cell body and/or longitudinal connection along the length direction of the cell body, so that the assembling connection structure has the advantage of high assembling connection flexibility, and can meet the assembling of modules with different specifications, thereby achieving the beneficial effects of improving the space volume utilization rate and the grouping efficiency, and improving the energy density and the endurance mileage of the battery pack.

Description

Lithium ion battery module

Technical Field

The utility model relates to the field of new energy power batteries, in particular to a lithium ion battery module.

Background

Regarding the battery module in new forms of energy power battery field, the mainstream has 355, 390, 590 series of modules at present, and the common shortcoming of these several types of modules is that the flexibility is not enough, and the cost is higher, and it is lower just can not satisfy the demand of the inside battery compartment size of different motorcycle types to organize efficiency in groups. Especially, 355 module size as the most mainstream is less, can only be fit for the less new energy automobile of wheel base, and the size that needs the motorcycle type platform is little, and battery cell body is in groups efficient, and is with high costs.

Because the demand of each whole car enterprise is different, and the different motorcycle type demand of every enterprise is also different, and the size of electric core enterprise is more difficult to satisfy the module specification of each whole car enterprise one by one. Such as: to some module specifications, 355 system module can have transversely put 3 then have too many vacant, put 4 circumstances that still can't realize, cause the space on the make full use of motorcycle type of being difficult to cause the flexibility poor, volume utilization and group inefficiency, influenced the electric quantity of battery package and the energy density of system greatly.

With the increasing energy crisis, the lithium ion battery industry is currently being supported by high importance and great effort in all countries of the world as an important component of new energy. The battery cell cannot meet the direct use of a user load due to low single voltage, and is connected in a series-parallel mixed connection mode, and then is assisted with monitoring management control of voltage, temperature, current and the like, so that direct power supply on the load side is realized.

At present, a traditional square-shell lithium ion battery module generally comprises a square-shell battery cell body, a buffer cushion between battery cells, a supporting frame, an electric connecting piece, an insulating assembly, a safety assembly and the like; wherein, the square-shell battery just, negative terminal post and relief valve all are located the upper surface of battery, just, negative terminal post is outwards protruded from the upper surface of battery, arrange the busbar back in utmost point post top, can occupy the high space of battery utmost point post top, cause the volume utilization ratio of battery direction of height not high, and efficiency in groups is not high, and then influences the energy density and the continuation of the journey mileage of battery.

Furthermore, traditional square shell lithium ion battery is in groups the back, and the gaseous gas that produces gas at the inside electrochemical reaction that takes place of charge-discharge in-process is generally discharged through the relief valve, if the gaseous sudden expansion of module inside, the gaseous meeting that gives out through the relief valve can lead to the fact the damage to spare part on every side easily to the diffusion in all directions, if outside the system is discharged in untimely orientation, gaseous meeting inflation even takes place the explosion, and the battery module can have great potential safety hazard.

SUMMERY OF THE UTILITY MODEL

In view of the above, embodiments of the present invention provide a lithium ion battery module, which can solve at least one of the above problems in the prior art; particularly, the free assembling connection of the plurality of cell assemblies is realized through the assembling support on the cell body, the flexibility is high, the assembling of modules with different specifications can be met, and the space volume utilization rate and the grouping efficiency are improved.

In order to achieve the above object, an embodiment of the present invention provides a lithium ion battery module, which includes a plurality of assembled and connected battery cell assemblies, each battery cell assembly includes a battery cell body and an assembled bracket disposed on the battery cell body; the assembling connection of the battery cell assembly comprises transverse connection along the width direction of the battery cell body and/or longitudinal connection along the length direction of the battery cell body.

Furthermore, the assembling support is provided with a clamping groove and a clamping protrusion matched and clamped with the clamping groove.

Further, assemble the support including with the support is assembled to the first support of assembling of electric core body top looks adaptation connection and with the support is assembled to the second of electric core body bottom looks adaptation connection.

Further, be provided with the relief valve on the electric core body, set up on the first support of assembling with the mounting hole of relief valve looks adaptation, the both sides of mounting hole all are provided with first card strip, first card strip sets up dorsad one side of electric core body, the length direction of first card strip is the width direction of electric core body.

Further, the lateral surface of the first support of assembling is provided with a plurality of first forked tail sand grips and the first dovetail groove with this first forked tail sand grip looks adaptation, the lateral surface of the second support of assembling is provided with a plurality of second forked tail sand grips and the second dovetail groove with this second forked tail sand grip looks adaptation.

Further, the binding belt is used for fixing the first assembling support and the second support in a binding mode.

Further, still include with the first apron of assembling support lock joint.

Further, be provided with on the assembly apron with first card strip looks adaptation connection's second card strip, the top of relief valve forms the pressure release passageway.

Furthermore, a clamping head is arranged on the first assembling support, and a clamping hole matched with the clamping head is formed in the assembling cover plate.

Further, a buffer material is sandwiched between any adjacent two of the electric core assemblies.

Furthermore, a groove is formed in the battery cell body, a confluence structure is arranged in the groove, and the outer surface of the confluence structure does not exceed the outer edge of the notch of the groove.

The utility model has the beneficial effects that:

1. the assembling support on the cell body is used for realizing the free assembling connection of the plurality of cell assemblies, and the assembling connection of the cell assemblies comprises transverse connection along the width direction of the cell body and/or longitudinal connection along the length direction of the cell body, so that the assembling connection structure has the advantage of high assembling connection flexibility, can meet the assembling of modules with different specifications, and achieves the beneficial effects of improving the space volume utilization rate and the grouping efficiency and improving the energy density and the endurance mileage of a battery pack.

2. According to the utility model, through the clamping grooves and the clamping protrusions arranged on the assembling support, further, the free assembling connection of a plurality of electric core assemblies is realized through a plurality of first dovetail protruding strips arranged on the outer side surface of the first assembling support and first dovetail grooves matched with the first dovetail protruding strips, and a plurality of second dovetail protruding strips arranged on the outer side surface of the second assembling support and second dovetail grooves matched with the second dovetail protruding strips, so that the electric core assemblies are simple and convenient to install and disassemble, the later-stage replacement and maintenance are facilitated, and the electric core assembly has the beneficial effect of ultrahigh flexibility.

3. According to the utility model, the assembled cover plate is connected to the first assembled support in a buckling manner, and the closed pressure relief channel is formed above the pressure relief valve, so that high-pressure gas generated by the battery module in the charging and discharging process is outwards defined and dredged through the pressure relief valve and the pressure relief channel, the battery module and surrounding parts are prevented from being damaged, and the safety performance of the battery is greatly improved.

4. According to the utility model, through the arrangement that the outer surface of the confluence structure does not exceed the outer edge of the notch of the groove, the volume utilization rate and the grouping efficiency in the height direction of the battery are improved, and further, the energy density and the endurance mileage of the battery are improved.

Drawings

The following drawings are included to provide a further understanding of the utility model, are incorporated in and constitute a part of this application, and are provided for illustrative purposes only and are not intended to limit the scope of the utility model. In the drawings:

fig. 1 is an exploded view of a lithium ion battery module according to an embodiment of the present disclosure;

fig. 2 is a schematic view illustrating an assembly structure of a lithium ion battery module according to an embodiment of the present disclosure;

FIG. 3 is an exploded view of an electrical core assembly according to an embodiment of the present application;

FIG. 4 is a schematic view of a first sectional support structure according to an embodiment of the present disclosure;

fig. 5 is a schematic structural diagram of a splicing cover plate in an embodiment of the present application;

FIG. 6 is a schematic view of a second mounting bracket according to an embodiment of the present application;

fig. 7 is a schematic diagram of a partial enlargement of a groove of a cell body in an embodiment of the present application;

FIG. 8 is a schematic view of a second assembly of 4 cell modules according to another embodiment of the present invention;

FIG. 9 is a schematic view of a third assembly of 4 electric core assemblies in another embodiment of the present application;

fig. 10 is a schematic view of a first assembly connection of 12 electric core assemblies in another embodiment of the present application;

fig. 11 is a schematic view of a second assembly connection of 12 electric core assemblies in another embodiment of the present application;

fig. 12 is a schematic view of a third assembly connection of 12 electric core assemblies in another embodiment of the present application.

Reference numerals:

1. an electrical core assembly; 10. a cell body; 101. a groove; 102. a pressure relief valve; 103. a pole column; 104. a bus bar; 105. a positive and negative electrode lead-out row; 21. a first assembled bracket; 210. mounting holes; 211. a first dovetail bead; 212. a first dovetail groove; 213. a first clip strip; 214. clamping a head; 22. a second assembled bracket; 221. a second dovetail convex strip; 222. a second dovetail groove; 3. assembling a cover plate; 30. a clamping hole; 31. a second card strip; 4. a binding band; 5. a buffer material.

Detailed Description

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the principles of the utility model and not to limit the utility model.

It should be noted that, unless the directions indicated are individually defined, the directions of up, down, left, right, etc. referred to herein are based on the directions of up, down, left, right, etc. shown in fig. 1 of the embodiment of the present application, and if the specific posture is changed, the directional indication is changed accordingly. As used herein, the terms "first," "second," "third," "fourth," and the like do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Further, in the various embodiments of the present disclosure, the same or similar reference numerals denote the same or similar components.

In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part, unless otherwise expressly stated or limited. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the scope of the present invention as claimed.

Example one

As shown in fig. 1 to fig. 6, the present embodiment provides a lithium ion battery module, which includes four battery core assemblies 1 connected in an assembled manner, wherein, as shown in fig. 1 to fig. 3, the four battery core assemblies 1 are sequentially connected in a transverse direction along a width direction of a battery cell body 10, and no longitudinal connection is implemented along a length direction of the battery cell body; the cell assembly 1 in this embodiment includes a cell body 10 and an assembling bracket disposed on the cell body 10.

It should be noted that, in the present embodiment, four electrical core assemblies are taken as an example, but not limited to four electrical core assemblies, which may be 6, 8, 12 or may be arranged and assembled into more electrical core assemblies with different numbers in the horizontal and vertical assembling and connecting modes according to the sizes of the specific module specifications of different enterprises and different vehicle models.

Utilize the technical scheme of this embodiment, the connection is assembled to the freedom that a plurality of electricity core subassembly was realized to the support of assembling on this embodiment through electric core body, moreover, because the connection of assembling of electricity core subassembly includes along electric core body width direction's transverse connection and/or along electric core body length direction's longitudinal tie, has the advantage of assembling and connecting the flexibility height, can satisfy assembling of different specification modules, reach and improve space volume utilization and efficiency in groups, improve the energy density of battery package and the beneficial effect of continuation of the journey mileage.

As shown in the first assembly bracket structure schematic diagram of fig. 4 and the second assembly bracket structure schematic diagram of fig. 6, as a preferred embodiment, the assembly bracket in this embodiment is provided with a clamping groove and a clamping protrusion adapted to be clamped and connected with the clamping groove. Further, the assembling support comprises a first assembling support 21 and a second assembling support 22, wherein the first assembling support 21 is in adaptive connection with the top of the battery cell body 10, and the second assembling support 22 is in adaptive connection with the bottom of the battery cell body 10. Specifically, in the present embodiment, the outer side surface of the first assembling bracket 21 is provided with a plurality of first dovetail ribs 211 and first dovetail grooves 212 adapted to the first dovetail ribs 211, and the outer side surface of the second assembling bracket 22 is provided with a plurality of second dovetail ribs 221 and second dovetail grooves 222 adapted to the second dovetail ribs 221.

It should be noted that, the material of the first assembled bracket and the second assembled bracket of the present embodiment is preferably, but not limited to, an extruded insulating material such as ABS, PC, etc., and may also be formed by a metal material and an insulating material coated outside. The first second forked tail sand grip that assembles the second forked tail sand grip that a plurality of first forked tail sand grips that the lateral surface of support set up and second of assembling the support set up is the protruding embodiment of concrete card, with a plurality of first dovetail of this first forked tail sand grip looks adaptation and with the second dovetail of this second forked tail sand grip looks adaptation be an embodiment of concrete draw-in groove, come the free connection of assembling between the concrete realization electric core subassembly through above-mentioned structure, thereby make the installation between electric core subassembly, it is simple convenient to dismantle, and do benefit to the change in later stage, the maintenance, the beneficial effect who has super high flexibility.

As shown in fig. 1 and fig. 3, as a preferred embodiment, a pressure relief valve 102 is disposed on the battery cell body 10 in this embodiment, a mounting hole 210 adapted to the pressure relief valve 102 is disposed on the first assembling support 21, first clamping strips 213 facing away from one side of the battery cell body are disposed on both sides of the mounting hole 210, a length direction of the first clamping strips is a width direction of the battery cell body 10, and directional pressure relief of the assembled battery modules can be fully implemented by the design in this direction. Furthermore, the assembling cover plate 3 is buckled and connected above the first assembling support 21, a second clamping strip 31 which is in adaptive connection with the first clamping strip 213 is arranged on the assembling cover plate 3, furthermore, a clamping head 214 is arranged on the first assembling support 21, and a clamping hole 30 which is in adaptive connection with the clamping head 214 is arranged on the assembling cover plate 3; under the buckling connection of the assembly cover plate 3 and the first assembly bracket 21, the pressure relief valve 102 is arranged in the mounting hole 210 in a penetrating manner, and a so-called closed directional pressure relief channel is formed by combining the closed buckling of the first clamping strip 213 and the second clamping strip 31 on the two sides of the mounting hole 210.

It should be noted that, the apron lock of assembling of this embodiment is connected at first support of assembling, has formed inclosed directional pressure release passageway in the top of relief valve to with the battery module at the discharge in-process production high-pressure gas through relief valve and pressure release passageway, outwards define to the mediation, avoid damaging battery module and spare part around it, improved the security performance of battery greatly.

As shown in fig. 1, as a preferred embodiment, the lithium ion battery module in this embodiment further includes a binding belt 4 for binding and fixing the first assembled bracket 21 and the second assembled bracket 22.

It should be noted that, the binding band of this embodiment binds and fixes the battery modules after being grouped, and provides a certain binding force for the expansion of each battery cell body, so that the battery module structure becomes an organic whole, and the material of the binding band is preferably, but not limited to, engineering plastics or steel materials, and may also be other materials with structural strength.

As shown in fig. 1, as a preferred embodiment, a buffer material 5 is sandwiched between any adjacent two electric core assemblies 1.

It should be noted that, the buffer material in this embodiment includes EVA, PE, XPE, TPE, and other materials, and the material has a certain thickness and a certain tensile strength or compressive strength, and can satisfy the requirement of recovering the original form in a specific compression time, satisfy the expansion allowance during the charge and discharge process and after the cycle of the electric core side, and have a buffering effect and an electrical isolation effect in the use or storage process.

As a preferred embodiment, the battery cell body 1 in this embodiment is provided with a groove 101, and a bus structure is disposed in the groove, and an outer surface of the bus structure does not exceed an outer edge of a notch of the groove.

It should be noted that, the structure of the cell body in this embodiment is preferably, but not limited to, a "convex" type cell; as shown in fig. 1, the bus structure in this embodiment includes a terminal 103 (positive and negative terminals) on the cell body, a bus bar 104 welded to the terminal, and a positive and negative lead-out bar 105. As shown by the enlarged view of the structure at the groove in FIG. 7, the vertical distance between the upper surface of the bus bar structure (i.e. the upper surface of the bus bar 104) and the outer edge 1011 of the notch of the groove in the embodiment is Δ H1, so that 0 ≦ Δ H1 ≦ 25mm, more preferably 5 ≦ Δ H1 ≦ 15mm, and still more preferably 10mm Δ H1.

Example two

As shown in fig. 8, the difference between the present embodiment and the first embodiment is: 4 electric core subassembly second kind that this embodiment adopted is assembled and is connected unitized mode, 2 electric core subassemblies along electric core body's width direction transverse connection in proper order promptly, and 2 electric core subassemblies are along electric core body's length direction longitudinal connection in proper order.

EXAMPLE III

As shown in fig. 9, the difference between the present embodiment and the first and second embodiments is: the connection mode in groups is assembled to 4 electric core subassembly third kind that this embodiment adopted, and 4 electric core subassemblies are longitudinal connection in proper order along the length direction of electricity core body promptly, do not implement transverse connection along the width direction of electricity core body.

Example four

As shown in fig. 10, the difference between the present embodiment and the first to third embodiments is: 12 electric core subassemblies that this embodiment adopted are connected in groups, and the mode of assembling the connection that this embodiment adopted is that 6 electric core subassemblies are along the width direction of electric core body transverse connection in proper order, and 2 electric core subassemblies are along the length direction of electric core body longitudinal connection in proper order.

EXAMPLE five

As shown in fig. 11, the present embodiment is different from the fourth embodiment in that: the 12 electric core subassembly second kind that this embodiment adopted is assembled and is connected unitized mode, 4 electric core subassemblies are along electric core body's width direction transverse connection in proper order promptly, and 3 electric core subassemblies are along electric core body's length direction longitudinal connection in proper order.

EXAMPLE six

As shown in fig. 12, the present embodiment is different from the fourth embodiment and the fifth embodiment in that: the 12 electric core subassembly third kinds that this embodiment adopted are assembled and are connected unitized mode, and 3 electric core subassemblies are along electric core body's width direction transverse connection in proper order promptly, and 4 electric core subassemblies are along electric core body's length direction longitudinal connection in proper order.

EXAMPLE seven

The difference between this embodiment and the fourth, fifth and sixth embodiments is: the fourth kind of 12 electric core subassembly that this embodiment adopted is assembled and is connected unitized mode, 2 electric core subassemblies along electric core body's width direction transverse connection in proper order promptly, and 6 electric core subassemblies are along electric core body's length direction longitudinal connection in proper order.

Example eight

The difference between this embodiment and the fourth, fifth, sixth and seventh embodiments is that: the fifth kind of mode of connecting into groups is assembled to 12 electric core subassemblies that this embodiment adopted, and 12 electric core subassemblies are transverse connection in proper order along the width direction of electricity core body promptly, do not implement longitudinal connection in the length direction of electricity core body.

Example nine

The difference between this embodiment and the fourth, fifth, sixth, seventh and eighth embodiments is that: the sixth kind of mode of connecting of assembling of 12 electric core subassemblies that this embodiment adopted, 12 electric core subassemblies are longitudinal connection in proper order along the length direction of electricity core body promptly, do not implement transverse connection in the width direction of electricity core body.

In summary, the utility model realizes the free assembly connection of a plurality of electric core assemblies through the assembly support on the electric core body, and moreover, because the assembly connection of the electric core assemblies comprises the transverse connection along the width direction of the electric core body and/or the longitudinal connection along the length direction of the electric core body, the assembly of modules with different specifications can be met, the space volume utilization rate and the grouping efficiency can be improved, the energy density and the endurance mileage of the battery pack can be improved, meanwhile, the assembly and the disassembly among the electric core assemblies can be simple and convenient, the later replacement and the maintenance can be facilitated, and the electric core assembly has the beneficial effect of ultrahigh flexibility.

While the above description shows and describes the preferred embodiments of the application, it is to be understood, as noted above, that the application is not limited to the forms disclosed herein, but is not intended to be exhaustive of other embodiments, and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the subject matter disclosed above, as determined by the teachings or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the application, which is to be protected by the claims appended hereto.

Claims

1. A lithium ion battery module is characterized by comprising a plurality of assembled and connected battery cell assemblies, wherein each battery cell assembly comprises a battery cell body and an assembled bracket arranged on the battery cell body;

the assembling connection of the battery cell assembly comprises transverse connection along the width direction of the battery cell body and/or longitudinal connection along the length direction of the battery cell body.

2. The lithium ion battery module as claimed in claim 1, wherein the assembling bracket is provided with a clamping groove and a clamping protrusion which is matched and clamped with the clamping groove;

the assembling support comprises a first assembling support and a second assembling support, wherein the first assembling support is connected with the top of the battery cell body in an adaptive mode, and the second assembling support is connected with the bottom of the battery cell body in an adaptive mode.

3. The lithium ion battery module of claim 2, wherein a pressure release valve is disposed on the battery cell body, a mounting hole adapted to the pressure release valve is disposed on the first assembling support, first clamping strips are disposed on two sides of the mounting hole, and the first clamping strips are disposed on a side facing away from the battery cell body.

4. The lithium ion battery module of claim 2, wherein the outer side surface of the first assembling bracket is provided with a plurality of first dovetail ribs and first dovetail grooves matched with the first dovetail ribs, and the outer side surface of the second assembling bracket is provided with a plurality of second dovetail ribs and second dovetail grooves matched with the second dovetail ribs.

5. The lithium ion battery module of claim 2, further comprising a tie strap for tie-fixing the first and second split brackets.

6. The lithium ion battery module of claim 3, wherein the cell assembly further comprises a splice cover plate snap-fit connected to the first splice bracket.

7. The lithium ion battery module of claim 6, wherein a second clamping strip is arranged on the assembled cover plate and is in adaptive connection with the first clamping strip, and a pressure relief channel is formed above the pressure relief valve.

8. The lithium ion battery module as claimed in claim 6, wherein the first assembling bracket is provided with a clamping head, and the assembling cover plate is provided with a clamping hole matched with the clamping head.

9. The lithium ion battery module of claim 1, wherein a buffer material is sandwiched between any two adjacent cell assemblies.

10. The lithium ion battery module of any of claims 1-9, wherein a groove is disposed on the cell body, a bus structure is disposed in the groove, and an outer surface of the bus structure does not exceed an outer edge of a notch of the groove.