CN220138602U - Battery pack - Google Patents

Abstract

The utility model relates to the technical field of lithium batteries, in particular to a battery pack. The battery cell module comprises a shell, a separation beam, a plurality of battery cell modules and a bottom plate, wherein the bottom plate is connected with the shell, and an accommodating space for accommodating the battery cell modules is formed by surrounding the bottom plate and the shell; the separation beam is connected with the shell, so that the accommodating space is divided into a plurality of accommodating parts, each accommodating part is correspondingly provided with one battery cell assembly, the bottom plate comprises at least one strip-shaped through hole, at least one row of explosion-proof valves are arranged at the bottom of each battery cell assembly, and each row of explosion-proof valves are communicated with the corresponding strip-shaped through holes. According to the battery pack, the problems that the existing blade battery pack is inconvenient to exhaust and the weight of the blade battery pack is large due to the explosion-proof valve arranged at the bottom of the battery cell module are solved.

Description

Battery pack

Technical Field

The utility model relates to the technical field of lithium batteries, in particular to a battery pack.

Background

With the rise of new energy automobiles, the design of a battery pack is strived for, and the safety design of the battery pack has become a hot problem in current researches, wherein the most popular problem is the arrangement mode of the battery pack.

The traditional battery pack is a module structure formed by a plurality of battery cells and is directly arranged on the shell of the battery pack. However, conventional battery packs are less efficient in grouping.

In this regard, blade battery pack structures have been developed to address the problem of lower battery pack efficiencies. The existing blade battery pack is characterized in that the accommodating space of a shell is divided into four parts through a cross beam and a longitudinal beam, each part is correspondingly provided with an electric core module, and the bottom of the electric core module is provided with a bottom plate support.

However, in the conventional blade battery pack, the bottom of the battery cell module is provided with the bottom plate for supporting, the explosion-proof valve is arranged at the bottom of the battery cell module, so that the exhaust is inconvenient, and the weight of the blade battery pack is large.

Disclosure of Invention

The utility model aims to provide a battery pack, so that the problems that an explosion-proof valve arranged at the bottom of a battery cell module is inconvenient to exhaust and the weight of the battery pack is large in the conventional blade battery pack are solved.

The utility model provides a battery pack, which comprises a shell, a separation beam, a plurality of battery cell assemblies and a bottom plate, wherein the bottom plate is connected with the shell, and an accommodating space for accommodating the battery cell assemblies is formed by surrounding the bottom plate and the shell; the separation beam is connected with the shell, so that the accommodating space is divided into a plurality of accommodating parts, each accommodating part is correspondingly provided with one battery cell assembly, the bottom plate comprises at least one strip-shaped through hole, at least one row of explosion-proof valves are arranged at the bottom of each battery cell assembly, and each row of explosion-proof valves are communicated with the corresponding strip-shaped through holes.

In any of the above-mentioned technical solutions, further, the bottom plate includes a plurality of bar-shaped through holes that set up along the first direction interval, the division roof beam includes middle crossbeam and longeron, middle crossbeam with the longeron is all connected the shell, with four accommodation space divide into accommodation portion, wherein, middle crossbeam is followed the first direction extends, the longeron is followed the second direction and is extended, first direction perpendicular to the second direction, the battery package still includes along the front crossbeam and the rear crossbeam that the first direction extends, front crossbeam with the rear crossbeam is all connected the shell, four the electric core subassembly sets up between the front crossbeam with the rear crossbeam.

In any of the above technical solutions, further, the housing includes a front side beam, a rear side beam and two side beams connected to each other, the front side beam and the rear side beam all extend along the first direction, the side beams extend along the second direction, two ends of the middle beam are respectively connected with two side beams, two ends of the front beam are respectively connected with two side beams, two ends of the rear beam are respectively connected with two side beams, and two ends of the longitudinal beam are respectively connected with the front beam and the rear beam.

In any of the above-mentioned technical solutions, further, the bottom plate includes a plurality of bar-shaped plates extending along the second direction, a bar-shaped through hole is formed between two adjacent bar-shaped plates, each bar-shaped plate connects simultaneously the front cross beam, the middle cross beam and the rear cross beam, among the plurality of bar-shaped plates, two of the bar-shaped plates connect two of the side beams respectively, one of the bar-shaped plates connects the longitudinal beam.

In any of the above technical solutions, further, two of the strip-shaped plate members, two of the side beams, the front side beam and the rear side beam are integrally formed by extrusion of profiles.

In any of the above technical solutions, further, the front beam, the middle beam and the rear beam are all connected with the plurality of strip-shaped plates through rivets, and the front beam, the middle beam and the rear beam are all hollow structures.

In any of the above technical solutions, further, the battery pack further includes a cold plate and a heat-conducting structural adhesive, the cold plate is connected with the housing and located at the top of the battery cell assembly, and the cold plate is adhered to the battery cell assembly through the heat-conducting structural adhesive.

In any of the above technical solutions, further, the battery pack further includes a bottom protection plate, the bottom protection plate is connected with the housing and located at the bottom of the battery cell assembly, the external bolts can sequentially pass through the cold plate and the middle cross beam and are connected with the bottom protection plate, and the external bolts can sequentially pass through the cold plate, the longitudinal beam and the corresponding strip-shaped plate and are connected with the bottom protection plate.

In any of the above technical solutions, further, the battery pack further includes a structural adhesive and a glue-spreading limiting strip, the glue-spreading limiting strip is disposed at an edge of the strip-shaped plate, the structural adhesive is disposed inside the glue-spreading limiting strip, and the battery cell assembly and the bottom plate are both adhered by the structural adhesive.

In any of the above technical solutions, further, the battery pack further includes a plurality of heat protection pieces and a plurality of support bars, the plurality of support bars are disposed at intervals along the first direction in the bottom protection plate, each heat protection piece is overlapped by two adjacent support bars, and the heat protection pieces are disposed on one side of the support bars facing away from the bottom protection plate, so that exhaust channels are formed by surrounding the two adjacent support bars, the bottom protection plate and the corresponding heat protection pieces; the battery cell assembly is arranged on the heat protection piece, each battery cell assembly comprises explosion-proof valves, each row of explosion-proof valves is connected with the corresponding heat protection piece through the corresponding strip-shaped through holes, the shell comprises an exhaust part, and each exhaust channel is communicated with the exhaust part.

Compared with the prior art, the utility model has the beneficial effects that:

according to the battery pack, the blade battery pack is divided into a plurality of accommodating parts by the separation beam, and each accommodating part is correspondingly provided with one cell assembly. On one hand, the blade battery pack improves the grouping efficiency of the battery pack, and on the other hand, the structure of the separation beam improves the strength of the blade battery pack.

On this basis, the bottom plate includes a plurality of bar through-holes that set up along first direction interval, and the multirow explosion-proof valve of the bottom setting of every electric core subassembly, every row explosion-proof valve communicates with the bar through-hole that corresponds. On the one hand, the plurality of strip-shaped through holes are formed in the bottom plate, so that the blade battery pack is lighter, on the other hand, when the air pressure in the battery cell assembly exceeds the threshold value, the leaked air in the battery cell assembly can be discharged to the outside of the blade battery pack through the strip-shaped through holes at the bottom, the exhaust is convenient, and the safety of the battery pack is greatly improved.

In order to make the above objects, features and advantages of the present utility model more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 illustrates an exploded structural view of a battery pack according to an embodiment of the present utility model;

fig. 2 is a partial schematic structure of a battery pack according to an embodiment of the present utility model;

FIG. 3 shows a schematic view of the mounting structure of a housing according to an embodiment of the utility model;

fig. 4 shows a schematic structural view of a cell assembly according to an embodiment of the present utility model.

Icon: 100-a housing; 101-front side beams; 1011-an exhaust section; 102-a rear side beam; 103-side beams; 200-middle cross beam; 300-front cross beam; 400-rear cross beam; 500-stringers; 600-bar-shaped plate; 700-cold plate; 800-heat conduction structural adhesive; 900-bottom guard board; 1000-cell assembly; 1001-explosion-proof valve; 1100-mica board; 1200-supporting bars; 1400-bolt; 1500-blind rivet.

Detailed Description

The following detailed description is provided to assist the reader in obtaining a thorough understanding of the methods, apparatus, and/or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatuses, and/or systems described herein will be apparent after an understanding of the present disclosure. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but rather, obvious variations may be made upon an understanding of the present disclosure, other than operations that must occur in a specific order. In addition, descriptions of features known in the art may be omitted for the sake of clarity and conciseness.

The features described herein may be embodied in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein have been provided solely to illustrate some of the many possible ways of implementing the methods, devices, and/or systems described herein that will be apparent after understanding the present disclosure.

In the entire specification, when an element (such as a layer, region or substrate) is described as being "on", "connected to", "bonded to", "over" or "covering" another element, it may be directly "on", "connected to", "bonded to", "over" or "covering" another element or there may be one or more other elements interposed therebetween. In contrast, when an element is referred to as being "directly on," directly connected to, "or" directly coupled to, "another element, directly on," or "directly covering" the other element, there may be no other element intervening therebetween.

As used herein, the term "and/or" includes any one of the listed items of interest and any combination of any two or more.

Although terms such as "first," "second," and "third" may be used herein to describe various elements, components, regions, layers or sections, these elements, components, regions, layers or sections should not be limited by these terms. Rather, these terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first member, component, region, layer or section discussed in examples described herein could also be termed a second member, component, region, layer or section without departing from the teachings of the examples.

For ease of description, spatially relative terms such as "above … …," "upper," "below … …," and "lower" may be used herein to describe one element's relationship to another element as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "upper" relative to another element would then be oriented "below" or "lower" relative to the other element. Thus, the term "above … …" includes both orientations "above … …" and "below … …" depending on the spatial orientation of the device. The device may also be otherwise positioned (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the disclosure. Singular forms also are intended to include plural forms unless the context clearly indicates otherwise. The terms "comprises," "comprising," and "having" are intended to specify the presence of stated features, integers, operations, elements, and/or groups thereof, but do not preclude the presence or addition of one or more other features, integers, operations, elements, and/or groups thereof.

Variations from the shapes of the illustrations as a result, of manufacturing techniques and/or tolerances, are to be expected. Accordingly, the examples described herein are not limited to the particular shapes shown in the drawings, but include changes in shapes that occur during manufacture.

The features of the examples described herein may be combined in various ways that will be apparent upon an understanding of the present disclosure. Further, while the examples described herein have a variety of configurations, other configurations are possible as will be apparent after an understanding of the present disclosure.

A battery pack according to some embodiments of the present utility model will be described with reference to fig. 1 to 4, which includes a case 100, a middle cross member 200, a longitudinal member 500, a plurality of cell assemblies 1000, and a bottom plate, wherein the bottom plate is connected to the case 100, and the bottom plate and the case 100 enclose a receiving space for receiving the cell assemblies 1000; the middle cross member 200 and the longitudinal member 500 are connected to the housing 100 to divide the receiving space into four receiving parts, each of which is provided with one cell assembly 1000. The bottom plate includes a plurality of bar-shaped through holes that set up along first direction interval, and the bottom of every electric core subassembly 1000 is provided with multirow explosion-proof valve 1001, and every row explosion-proof valve 1001 communicates with the bar-shaped through hole that corresponds.

According to the above technical features, the blade battery pack is divided into four receiving parts by the cross member and the side member 500, and each receiving part is provided with one cell assembly 1000. The blade battery pack of the utility model improves the grouping efficiency of the battery pack on the one hand, and the cross structure of the cross beam and the longitudinal beam 500 improves the strength of the blade battery pack on the other hand.

On this basis, the bottom plate includes a plurality of bar-shaped through holes that set up along first direction interval, and the multirow explosion-proof valve 1001 that the bottom of every electric core subassembly 1000 set up, every row explosion-proof valve 1001 communicates with corresponding bar-shaped through hole. On the one hand, the plurality of strip-shaped through holes are formed in the bottom plate, so that the blade battery pack is lighter, on the other hand, when the air pressure in the battery cell assembly 1000 exceeds the threshold value, the gas leakage in the battery cell assembly 1000 can be discharged to the outside of the blade battery pack through the strip-shaped through holes at the bottom, and the safety of the battery pack is improved greatly.

In the embodiment of the present utility model, referring to fig. 1 to 4, the direction shown by X in fig. 2 may be an example of a first direction, the direction shown by Y in the drawing may be an example of a second direction, and the direction shown by Z in the drawing may be an example of a third direction. Preferably, any two of the first direction X, the second direction Y, and the third direction Z are perpendicular.

Preferably, the middle cross member 200 extends in the first direction, the side members 500 extend in the second direction, the battery pack further includes a front cross member 300 and a rear cross member 400 extending in the first direction, each of the front cross member 300 and the rear cross member 400 is connected to the case 100, and four battery cell assemblies 1000 are disposed between the front cross member 300 and the rear cross member 400.

Further, as shown in fig. 2, the outer case 100 includes a front side rail 101, a rear side rail 102, and two side rails 103 connected to each other, wherein the front side rail 101 and the rear side rail 102 each extend in the first direction, the side rails 103 extend in the second direction, both ends of the middle cross rail 200 are welded to the middle portions of the two side rails 103, both ends of the front cross rail 300 are welded to the front ends of the two side rails 103, both ends of the rear cross rail 400 are welded to the rear ends of the two side rails 103, and both ends of the side rail 500 are welded to the middle portions of the front cross rail 300 and the rear cross rail 400, respectively.

Further, as shown in fig. 2, the bottom plate includes a plurality of bar-shaped plate members 600 extending in the second direction, a bar-shaped through hole is formed between two adjacent bar-shaped plate members 600, and each bar-shaped plate member 600 connects the front cross member 300, the middle cross member 200, and the rear cross member 400 at the same time. Based on this, in the plurality of cells included in each cell assembly 1000 of the present utility model, the length direction of each cell extends along the first direction, so that the length direction of each cell is perpendicular to (i.e. staggered with) the strip-shaped through holes, thereby improving the rigidity of the battery pack.

Further, among the plurality of strip-shaped plate members 600, two strip-shaped plate members 600 are respectively connected to the two side beams 103. As an example, as shown in fig. 2, two bar-shaped plate members 600 located at both sides are integrally formed with the housing 100 by profile extrusion. One of the strip plates 600 connects the stringers 500 for installation of the stringers 500.

In an embodiment of the present utility model, as shown in fig. 3, the front cross member 300, the middle cross member 200, and the rear cross member 400 may be connected to the plurality of strip-shaped plate members 600 by one row of blind rivets 1500, wherein the middle cross member 200 is connected to the plurality of strip-shaped plate members 600 by two rows of blind rivets 1500. Here, the front cross member 300, the middle cross member 200, and the rear cross member 400 may each have a hollow structure, further improving the weight reduction of the battery pack.

In an embodiment of the present utility model, as shown in fig. 1, the battery pack may further include a cold plate 700 and a heat-conducting structural adhesive 800, wherein the cold plate 700 is adhered above the battery cell module via the heat-conducting structural adhesive 800, so that the cold plate 700 is disposed on the top of the battery cell module, and cold air cooled by the cold plate 700 flows to the whole battery pack, thereby improving the cooling efficiency of the cold plate 700.

With continued reference to fig. 1, the battery pack may further include a bottom guard 900, where the bottom guard 900 is coupled to the housing 100 and is located at the bottom of the cell assembly 1000. As shown in fig. 3, the external bolts 1400 can pass through the cold plate 700 and the middle cross member 200 in order and connect the bottom rail 900, and the external bolts 1400 can pass through the cold plate 700, the stringers 500 and the corresponding strip-shaped plate members 600 in order and connect the bottom rail 900. Thus improving the overall strength of the battery pack.

In an embodiment of the present utility model, the battery pack may further include a structural adhesive and a glue-coated limit bar (not shown) disposed at an edge of the bar-shaped plate 600, and the structural adhesive is disposed inside the glue-coated limit bar. That is, the glue-coated limit bar is provided at the edge of the bar plate 600 to provide a supporting and limiting effect, and then both the cell assembly 1000 and the base plate are glued via the structural glue. Thus, not only the connection reliability of the battery cell assembly 1000 is improved, but also the redundant structural adhesive cannot overflow the strip-shaped plate 600 due to the limitation of the gluing limiting strips, so that the light weight of the battery pack is improved.

The exhaust passage and the exhaust path of the explosion proof valve 1001 will be described below.

As shown in fig. 2, the battery pack may further include a plurality of heat shields (the heat shields may be mica boards 1100, which will be described below as an example of the mica boards 1100) and a plurality of support bars 1200, the plurality of support bars 1200 being disposed at intervals in the first direction to the bottom guard plate 900, each mica board 1100 being overlapped via two adjacent support bars 1200, and the mica boards 1100 being disposed at a side of the support bars 1200 facing away from the bottom guard plate 900 such that the adjacent two support bars 1200, the bottom guard plate 900, and the corresponding mica boards 1100 are enclosed to form an exhaust passage; the battery cell assemblies 1000 are disposed on the mica boards 1100, and each battery cell assembly 1000 includes a plurality of rows of explosion-proof valves 1001, each row of explosion-proof valves 1001 being connected to a corresponding mica board 1100 through a corresponding strip-shaped through hole, and the housing 100 includes an exhaust portion 1011, each exhaust passage being in communication with the exhaust portion 1011 (e.g., an end of each exhaust passage having an air gap with the front cross member 300, the air gap being in communication with the exhaust portion 1011).

According to the above technical features, by disposing the plurality of support bars 1200 at intervals in the bottom guard plate 900 along the first direction, and the mica boards 1100 overlap via the side of the adjacent two support bars 1200 facing away from the bottom guard plate 900, the adjacent two support bars 1200, the bottom guard plate 900 and the corresponding mica boards 1100 enclose to form an exhaust channel, so when the air pressure in the cell assembly 1000 exceeds the threshold value, the venting gas in the cell assembly 1000 can sequentially pass through the explosion-proof valve 1001 and the mica boards 1100 to enter the exhaust channel, and then the venting gas is discharged from the exhaust portion 1011 via the air passing gap.

In this way, when the air pressure in the battery cell assembly 1000 exceeds the threshold value and needs to be discharged for pressure relief, the pressure relief air rushing out of the explosion-proof valve 1001 can be discharged through the independent exhaust passage (namely, the explosion-proof valve 1001, the exhaust passage and the exhaust part 1011), so that the speed of the pressure relief air discharged out of the battery pack is effectively improved.

Finally, it should be noted that: the above examples are only specific embodiments of the present utility model, and are not intended to limit the scope of the present utility model, but it should be understood by those skilled in the art that the present utility model is not limited thereto, and that the present utility model is described in detail with reference to the foregoing examples: any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or perform equivalent substitution of some of the technical features, while remaining within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model, and are intended to be included in the scope of the present utility model.

Claims (10)

1. A battery pack is characterized by comprising a shell, a separation beam, a plurality of cell assemblies and a bottom plate,

the bottom plate is connected with the shell, and an accommodating space for accommodating the battery cell assembly is formed by surrounding the bottom plate and the shell;

the separation beam is connected with the shell to divide the accommodating space into a plurality of accommodating parts, each accommodating part is correspondingly provided with one electric core component,

the bottom plate comprises at least one strip-shaped through hole,

the bottom of each battery cell assembly is provided with at least one row of explosion-proof valves, and each row of explosion-proof valves is communicated with the corresponding strip-shaped through holes.

2. The battery pack of claim 1, wherein the bottom plate includes a plurality of bar-shaped through holes spaced apart along the first direction,

the dividing beam comprises a middle cross beam and a longitudinal beam, the middle cross beam and the longitudinal beam are both connected with the shell to divide the accommodating space into four accommodating parts, wherein the middle cross beam extends along the first direction, the longitudinal beam extends along the second direction, the first direction is perpendicular to the second direction,

the battery pack further includes a front cross member and a rear cross member extending in the first direction, both of the front cross member and the rear cross member being connected to the housing,

four the electric core components set up the front cross beam with the back cross beam.

3. The battery pack of claim 2, wherein the housing includes a front side rail, a rear side rail, and two side rails connected to each other, the front side rail and the rear side rail each extending in the first direction, the side rails extending in the second direction,

two ends of the middle cross beam are respectively connected with two side beams,

two ends of the front cross beam are respectively connected with two side beams,

two ends of the rear cross beam are respectively connected with two side beams,

and two ends of the longitudinal beam are respectively connected with the front cross beam and the rear cross beam.

4. The battery pack according to claim 3, wherein the bottom plate includes a plurality of bar-shaped plate members extending in the second direction, a bar-shaped through hole is formed between adjacent two of the bar-shaped plate members,

each strip-shaped plate is simultaneously connected with the front beam, the middle beam and the rear beam,

two of the plurality of strip-shaped plate members are respectively connected with the two side beams,

one of the strip-shaped plate members is connected with the longitudinal beam.

5. The battery pack according to claim 4, wherein the two strip-shaped plate members, the two side rails, the front rail and the rear rail are integrally formed by profile extrusion.

6. The battery pack of claim 4, wherein the front cross member, the middle cross member, and the rear cross member are each connected to the plurality of strip-shaped plate members by rivets,

the front cross beam, the middle cross beam and the rear cross beam are hollow structures.

7. The battery pack of claim 4, further comprising a cold plate and a thermally conductive structural adhesive, the cold plate being attached to the housing and positioned on top of the cell assembly,

the cold plate is adhered to the cell assembly through the heat conducting structure adhesive.

8. The battery pack of claim 7, further comprising a bottom guard plate,

the bottom guard board is connected with the shell and is positioned at the bottom of the battery cell component,

external bolts can sequentially pass through the cold plate and the middle cross beam and are connected with the bottom guard plate,

the exterior bolts can sequentially pass through the cold plate, the longitudinal beam and the corresponding strip-shaped plate and are connected with the bottom guard plate.

9. The battery pack of claim 7, further comprising structural adhesive and adhesive-coated limit bars,

the gluing limiting strip is arranged at the edge of the strip-shaped plate, the structural glue is arranged in the gluing limiting strip,

both the cell assembly and the base plate are glued via the structural adhesive.

10. The battery pack of claim 8, further comprising a plurality of thermal shields and a plurality of support bars,

the support bars are arranged on the bottom guard plate at intervals along the first direction, each heat protection piece is overlapped by two adjacent support bars, and the heat protection pieces are arranged on one side of the support bars, which is opposite to the bottom guard plate, so that exhaust channels are formed by surrounding the two adjacent support bars, the bottom guard plate and the corresponding heat protection pieces;

the cell assembly is disposed on the thermal shield,

in the explosion-proof valves included in each cell assembly, each row of explosion-proof valves is connected with the corresponding heat protection piece through the corresponding strip-shaped through hole,

the housing includes exhaust portions, each of which communicates with the exhaust portion.