CN209312826U - Cabinet and battery pack for battery pack - Google Patents

Abstract

The utility model relates to a kind of cabinets and battery pack for battery pack, the opening that cabinet has accommodation space and is connected to accommodation space, accommodation space is enclosed by the wall portion of cabinet, and wall portion is laminated by two layers or more of substrate and is formed, and is formed with a plurality of cavities between two layers or more of substrate.Cabinet provided by the utility model for battery pack, by being formed with a plurality of cavities in wall portion, both the bearing capacity and impact resistance of cabinet had been improved, the heat management of cell assembly can also be realized by filling phase-change material or coolant liquid in a plurality of cavities, improve the mechanical performance of cabinet, and lighter in weight, reliability are higher.In addition, battery pack provided by the embodiment of the utility model improves the safety of battery pack using foregoing cabinet.

Description

Cabinet and battery pack for battery pack

Technical field

The utility model relates to power battery technology fields, more particularly to a kind of cabinet and battery for battery pack Packet.

Background technique

With the fast development of electric car industry, the demand of power battery is increasing, and the performance of power battery is wanted It asks and is also continuously improved.As the core component of electric car, safety, cruising ability and the charge efficiency of electrokinetic cell system will Directly influence the vehicle performance and service life of electric car.

In the prior art, weight of the cabinet of power battery due to needing to bear battery, usually by sheet metal component or cast aluminium Part composition.But while the car is driving, battery will receive from external various impacts, and cabinet is by external impact When external impact force directly can be passed into battery, will lead to for a long time battery abrasion, rupture, to cause safety accident.

Utility model content

The purpose of the utility model embodiment is to provide a kind of cabinet and battery pack for battery pack, the cabinet have compared with Good bearing capacity and impact resistance.

On the one hand, the utility model embodiment provides a kind of cabinet for battery pack, which has accommodation space And the opening being connected to accommodation space, accommodation space are enclosed by the wall portion of cabinet, wall portion is laminated by two layers or more of substrate It is formed, is formed with a plurality of cavities between two layers or more of substrate.

According to the one aspect of the utility model embodiment, substrate includes first substrate and the second substrate, and cavity is by second The convex wall of outwardly convex and on first substrate and flat wall corresponding with convex wall surrounds on substrate.

According to the one aspect of the utility model embodiment, first substrate and the second substrate are by the outer of accommodation space to cabinet The stacking of portion direction.

According to the one aspect of the utility model embodiment, convex wall includes top and the side that connect with top, and top is Plane or arcwall face, top and side rounding off.

According to the one aspect of the utility model embodiment, the value range of the wall thickness t of wall portion are as follows: 1mm≤t≤6mm, The ratio range of the wall thickness t2 of the wall thickness t1 and convex wall of flat wall are as follows: 0.5≤t2/t1≤1, the value range of the height h of cavity Are as follows: h≤5 × t1, and the ratio range of the height h and width W of cavity are as follows: h/W≤0.5.

According to the one aspect of the utility model embodiment, wall portion includes bottom wall and encloses in the side wall of bottom wall side, case Body further includes the eaves portion extended from the opening of accommodation space to all side directions far from accommodation space, and bottom wall, side wall and eaves portion are Integrated formed structure.

According to the one aspect of the utility model embodiment, between the intersection and cavity between adjacent two side walls most Small distance d >=25mm.

According to the one aspect of the utility model embodiment, a plurality of cavities are interconnected to form runner.

According to the one aspect of the utility model embodiment, inlet tube and outlet, import are provided on the side wall of cabinet Pipe and outlet are connected to the both ends of runner respectively, and inlet tube and outlet are located at the ipsilateral of side wall.

According to the one aspect of the utility model embodiment, tensile strength sigma >=100Mpa of the material of substrate, substrate Elongation at break >=12% of material.

According to the one aspect of the utility model embodiment, cavity is formed in first substrate and by inflation moulding process Between two substrates.

On the other hand, the utility model embodiment additionally provides a kind of battery pack comprising: cell assembly；Such as preceding institute Any cabinet stated；Lid is covered on the opening of cabinet, to form the envelope for accommodating cell assembly with the accommodation space of cabinet Close space.

Cabinet provided by the embodiment of the utility model for battery pack, by being formed with a plurality of cavities in wall portion, both The bearing capacity and impact resistance of cabinet are improved, it can also be by being packed into phase-change material or cooling in a plurality of cavities Liquid realizes the heat management of cell assembly, further promotes the shock resistance of cabinet, improves the mechanical performance of cabinet, and Structure is simple, lighter in weight, reliability are higher.In addition, battery pack provided by the embodiment of the utility model, using foregoing Cabinet improves the safety of battery pack.

Detailed description of the invention

The feature, advantage and technical effect of the utility model exemplary embodiment described below with reference to the accompanying drawings.

Fig. 1 is a kind of structural schematic diagram of battery pack provided by the embodiment of the utility model；

Fig. 2 is structural schematic diagram of one of the battery pack shown in FIG. 1 cabinet along an angle；

Fig. 3 is structural schematic diagram of the cabinet shown in Fig. 2 along another angle；

Fig. 4 is cross-sectional view of the cabinet shown in Fig. 3 along the direction A-A；

Fig. 5 is the enlarged structure schematic diagram of the region B in cross-sectional view shown in Fig. 4；

Fig. 6 is the structural schematic diagram for the runner that a plurality of cavities in cabinet shown in Fig. 3 are formed；

Fig. 7 is cross-sectional view of the cabinet shown in fig. 6 along the direction C-C；

Fig. 8 is the structural schematic diagram of another cabinet in battery pack shown in FIG. 1；

Fig. 9 is cross-sectional view of the cabinet shown in Fig. 8 along the direction D-D；

Figure 10 is the enlarged structure schematic diagram of the region E in cross-sectional view shown in Fig. 9；

Figure 11 is the enlarged structure schematic diagram of the region F in cabinet shown in Fig. 8.

Wherein:

1- cabinet；

10- accommodation space；

11- wall portion；

111- bottom wall；

112- side wall；

113- spherical shape angle；

12- eaves portion；

13- inlet tube；

131- installation step；

132- welds step；

14- outlet；

15- supporting element；

16- protector；

20- cavity；

21- first substrate；

211- flat wall；

22- the second substrate；

221- convex wall；

At the top of 2211-；

The side 2212-；

30- isolated island；

2- cell assembly；

3- lid；

R- runner；

R1- feed liquor doab；

R2- goes out liquid doab.

In the accompanying drawings, identical component uses identical appended drawing reference.The attached drawing is not drawn according to the actual ratio.

Specific embodiment

The feature and exemplary embodiment of the various aspects of the utility model is described more fully below.It is retouched in detail in following In stating, many details are proposed, in order to provide the comprehensive understanding to the utility model.But for those skilled in the art It will be apparent that the utility model can be implemented in the case where not needing some details in these details for member. Below the description of embodiment is used for the purpose of providing by showing the example of the utility model to the more preferable of the utility model Understanding.In the the accompanying drawings and the following description, at least part of known features and technology are not shown, to avoid to this reality Unnecessary obscure is caused with novel；Also, for clarity, may be exaggerated the size of part-structure.In addition, hereinafter being retouched Feature, the structure or characteristic stated can be incorporated in any suitable manner in one or more embodiments.

The noun of locality of middle appearance described below is direction shown in figure, is not the specific structure to the utility model It is defined.In the description of the present invention, it should also be noted that, unless otherwise clearly defined and limited, term " is pacified Dress ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, be also possible to detachable connection, or be integrally connected； It can be directly connected, can also be indirectly connected.For the ordinary skill in the art, on visual concrete condition understands State the concrete meaning of term in the present invention.In addition, term " first ", " second " are used for description purposes only, and cannot manage Solution is indication or suggestion relative importance or the quantity for implicitly indicating indicated technical characteristic.Define as a result, " first ", The feature of " second " can explicitly or implicitly include at least one of the features.

The utility model in order to better understand, below with reference to Fig. 1 to Figure 11 to the utility model embodiment for electricity The cabinet and battery pack of Chi Bao is described in detail.

Also referring to Fig. 1, Fig. 2 and Fig. 3, the utility model embodiment provides a kind of battery pack comprising: cabinet 1, Cell assembly 2 and lid 3.Lid 3 and cabinet 1 form the enclosure space for accommodating cell assembly 2.

In a kind of cabinet 1 for battery pack provided by the embodiment of the utility model, cabinet 1 have accommodation space 10 and with The opening that accommodation space 10 is connected to, accommodation space 10 encloses by the wall portion 11 of cabinet 1, and wall portion 11 is by two layers or more of base Board stacking is formed, and a plurality of cavities 20 are formed between two layers or more of substrate.

Cabinet 1 can be stamped to form using metal substrate, under normal circumstances, cell assembly and its pipe inside battery pack The value range of the wall thickness t for the wall portion 11 that the weight such as reason system are formed after 200Kg or more, metal substrate punching press are as follows: 1mm≤t ≤6mm.As t < 1mm, the wall portion 11 of cabinet 1 is excessively thin, can not carry cell assembly and other component in battery pack, and It is easily broken in use.As t > 6mm, volume shared by cabinet 1 is excessive, is unfavorable for the promotion of battery pack energy density. In order to improve the structural strength of cabinet 1 in a limited space, passes through and form a plurality of cavities 20 between two layers or more of substrate To promote the structural strength and bearing capacity of cabinet 1.

Compared to being arranged for the technical solution of reinforcing rib in the wall portion 11 of cabinet 1, which is improving the rigid of cabinet 1 While degree and intensity, cavity 20 can also promote the anti-vibrating and impact performance of cabinet 1.It is empty when battery pack is hit by the external world Chamber 20 can be absorbed and disperse the extraneous external shock power in part, achieve the effect that buffer shock-absorbing, to promote the entirety of battery pack Impact resistance.Cavity structure is being formed due to the limitation of casting technique compared to the cavity structure that cast aluminium extrusion process is formed When, wall thickness will generally be greater than 3mm, if internal form cavity, wall thickness is at least 6mm or more, and occupied space is big, is unfavorable for The promotion of the energy density of battery pack.

In addition, use environment temperature range is generally -30 DEG C~80 for the electric car for using power battery DEG C, the optimal use environment temperature of power battery is 20 DEG C~40 DEG C, in the charge-discharge performance of this temperature range internally-powered battery Most preferably, longest-lived, and 0 DEG C or less is charged to power battery, there is the danger of short circuit.Therefore, reasonable battery heat Management design is most important to the performance and used life of power battery.

For this purpose, Heat Conduction Material can be built into a plurality of cavities 20 of the wall portion 11 of cabinet 1, such as, but not limited to have The phase-change material or coolant liquid of solid-liquid transformation temperature, to realize the heat management of cell assembly 2.In compared with the existing technology For the technical solution of the general heat management for carrying out cell assembly 2 by built-in/external water-cooling system, structure is simple, accounts for It is small with space, excessive pipe joint is not needed, risk of leakage is avoided.Preferably, the Heat Conduction Material being placed in cavity 20 is Liquid or flexible material pass to internal liquid or flexible material by cavity 20, due to liquid when cabinet is by external impacts Body, the morphotropism of flexible material are higher, can further absorb external shock power, further promote the impact resistance of cabinet 1.

Cabinet 1 provided by the embodiment of the utility model for battery pack, by being formed with a plurality of cavities in wall portion 11 20, both improved the bearing capacity and impact resistance of cabinet 1, can also by a plurality of cavities 20 fill phase-change material or Person's coolant liquid realizes the heat management of cell assembly 2, further promotes the shock resistance of cabinet 1, improves the machine of cabinet 1 Tool performance, and structure is simple, lighter in weight, reliability are higher.

The tool of cabinet 1 provided by the embodiment of the utility model for battery pack is described in further detail with reference to the accompanying drawing Body structure.

Referring again to Fig. 1 and Fig. 2, cabinet 1 further includes from the opening of accommodation space 10 to the side far from accommodation space 10 The eaves portion 12 that direction extends, eaves portion 12 are connect with lid 3, to form the enclosure space for accommodating cell assembly 2.

The wall portion 11 of cabinet 1 includes bottom wall 111 and encloses in the side wall 112 of 111 side of bottom wall.Specifically, the bottom of cabinet 1 Wall 111, side wall 112 and eaves portion 12 are integrally formed structures, and to promote the leakproofness of cabinet 1, reduce cabinet 1 because connection causes Seal failure problem.

In order to guarantee the structural strength and load-bearing requirements of battery pack, metal substrate can use tensile strength sigma >=100Mpa Material can avoid cabinet in forming process since substrate becomes such as tensile strength sigma >=100Mpa aluminium, magnesium, iron and its alloy Shape causes the excessively thin or tension failure in part.Preferably, elongation at break >=12% of baseplate material, it is ensured that substrate is forming wall There is certain deflection during the side wall 112 and eaves portion 12 in portion 11, guarantee the leakproofness and intensity of cabinet 1.Due to electricity Chi Bao can meet with environment of paddling in use, and to avoid outside water from immersing in battery pack, the height of side wall 112 be should be greater than 20mm。

Also referring to Fig. 3 and Fig. 4, formed as previously mentioned, wall portion 11 is laminated by two layers or more of substrate, specifically, two Layer or more substrate the number of plies be two layers, the weight and volume of cabinet can be further decreased.The two-layer substrate is respectively the first base Plate 21 and the second substrate 22, cavity 20 are outside by the convex wall 221 of outwardly convex in the second substrate 22 and on first substrate 21 The convex wall (not shown) of protrusion surrounds.Alternatively, cavity 20 is by the convex wall 221 of outwardly convex in the second substrate 22 and positioned at the first base On plate 21 and flat wall 211 corresponding with convex wall 221 surrounds.As a result, when battery pack is by hitting, external force first acts on convex On wall 221, power is transferred to by cavity 20, the second substrate 22 and first substrate 21 by convex wall 221, by the Multistage dispersion of power, To promote the impact resistance of cabinet 1.Preferably, cavity 20 by outwardly convex in the second substrate 22 convex wall 221 and be located at On first substrate 21 and flat wall 211 corresponding with convex wall 221 surrounds, and convenient for other structures on cabinet 1, (such as supporting element is prevented Guard etc.) setting.

It is further preferred that first substrate 21 and the second substrate 22 are laminated by the outside direction of accommodation space 10 to cabinet 1, by This, the flat wall 211 of first substrate 21 is arranged close to the cell assembly 2 of battery pack, so that first substrate 21 is close to battery collection The surface of zoarium 2 is approximately plane, increases the contact area between first substrate 21 and cell assembly 2, makes to be transferred to battery The power of aggregate 2 is evenly dispersed, to promote the safety of cell assembly 2, avoid impacting because of localized external force it is excessive caused by electricity Pond aggregate 2 fails.

In order to guarantee the leakproofness of a plurality of cavities being formed between substrate 20, it is preferable that cavity 20 is formed by inflation Technique is formed between first substrate 21 and the second substrate 22.In order to avoid 221 inflation of convex wall of cavity 20 ruptures, further Preferably, baseplate material is the aluminium or aluminium alloy of elongation at break >=20%.Preferably, the tension of 21 material of first substrate is strong The tensile strength sigma 2 of 1 >=the second substrate of σ, 22 material is spent, convenient for controlling first substrate 21 and the second substrate 22 in blowing-up technology Deflection, so that first substrate 21 forms the flat wall 211 of opposing straight.

Refering to Fig. 5, the convex wall 221 in the second substrate 22 includes top 231 and the side 232 connecting with top 231, top 231 be plane or arcwall face, top 231 and 232 rounding off of side.Top 231 is preferably plane, can increase protrusion 23 It avoids external force at the highest point of protrusion 23 conducive to the evenly dispersed of external force with extraneous contact area, causes protrusion 23 Rupture.Top 231 and 232 rounding off of side are conducive to the dispersion of power, and increase the stability of protrusion 23, avoid part Active force is excessive, and protrusion 23 is caused to deform or rupture.

Further, the ratio range of the wall thickness t2 of the wall thickness t1 and convex wall 221 of flat wall 211 are as follows: 0.5≤t2/t1≤ 1；As t2/t1 > 1, when inflation forms cavity 20, first substrate 21 is easy torsional deformation, causes first substrate 21 close to battery The surface deformation of aggregate 2 can not be bonded with cell assembly 2；As t2/t1 < 0.5, in use, due to second The convex wall 221 that substrate 22 is formed is excessively thin, is easily broken at the position of convex wall 221, causes 20 seal failure of cavity.Cavity 20 The value range of height h are as follows: h≤5 × t1.Height h 5 × t1 of >, the rupture of the easy inflation of the second substrate 22.The height h of cavity 20 With the ratio range of width W are as follows: h/W≤0.5, when height h is excessively high, first substrate 21 is easy torsional deformation.Height h is too low When, fluid flow resistance increases, and the thermal management effect of cell assembly 2 reduces.

In addition, forming ball between bottom wall 111 and adjacent two side walls 112 after cabinet 1 is by metal substrate punch forming Shape angle 113 is unfavorable for arranging cavity 20 since the molding wall thickness at spherical angle 113 is relatively thin.In addition, spherical angle 113 is easily in external force The lower breakage of impact, in order to avoid influencing the leakproofness of cavity 20 because of the damage of spherical angle 113, between adjacent two side walls 112 Intersection and cavity 20 between minimum range d >=25mm, the work of cavity 20 is transferred to weaken external force by spherical angle 113 Firmly.For example, when a plurality of cavities 20 are set on bottom wall 111, the cavity 20 by proximal wall 112 that is formed on bottom wall 111 with Minimum range d >=25mm between side wall 112 causes cavity 20 to rupture, so as to cause close to avoid due to spherical 113 stress of angle The problem of envelope failure, as shown in Figure 4.

As previously mentioned, the wall portion 11 of cabinet 1 includes bottom wall 111 and encloses in the side wall 112 of 111 side of bottom wall.Cavity 20 It can be formed on bottom wall 111, side wall 112 can also be formed in, can also be formed on bottom wall 111 and side wall 112.Pass through conjunction The distribution of the arrangement cavity 20 of reason and area, can promote the impact resistance of battery pack.For ease of description, the utility model Embodiment is illustrated so that cavity 20 is formed in bottom wall 111 as an example.

Referring to Figure 6 together and Fig. 7, a plurality of cavities 20 formed on bottom wall 111 are interconnected to form runner R.Cabinet 1 Side wall 112 on be provided with inlet tube 13 and outlet 14, inlet tube 13 and outlet 14 are connected to the both ends of runner R respectively, And inlet tube 13 and outlet 14 are located at the ipsilateral of side wall 112, to reduce the overall dimensions of cabinet 1.Inlet tube 13 and outlet 14 structure of pipe is same or similar, and by taking inlet tube 13 as an example, installation step 131 and welding bench are arranged at intervals on inlet tube 13 Rank 132, inlet tube 13 are fixed on side wall 112 by welding step 132, are electrically connected by installation step 131 with external device.

As an alternative embodiment, a plurality of cavities 20 can be formed on bottom wall 111 be arranged side by side it is a plurality of into Liquid stream road and a plurality of time liquid stream road, and the one end in a plurality of feed liquor runner and a plurality of time liquid stream road is interconnected, other end difference It is connected to inlet tube 13 and outlet 14, to form a plurality of U-shaped runner in parallel, passes through phase-change material in runner or cooling Liquid can carry out heat management to entire cell assembly 2.

By taking cavity 20 is built into coolant liquid as an example, one end of inlet tube 13 and outlet 14 respectively with coolant liquid input and it is defeated Equipment is connected out, and the corresponding wall portion of the other end 11 is nearby respectively formed with mutually isolated feed liquor doab R1 and out liquid confluence Area R2, to improve coolant liquid in the flow velocity of each runner.As shown in fig. 7, feed liquor doab R1 is to be formed in side wall 112 and bottom wall Cavity 20 between 111, the cavity 20 are formed between first substrate 21 and the second substrate 22 by inflation moulding process, and And the feed liquor doab R1 is connected to a plurality of feed liquor runner being arranged side by side.Similar, liquid doab R2 is to be formed in side wall out Cavity 20 between 112 and bottom wall 111, the cavity 20 are formed in first substrate 21 and the second substrate 22 by inflation moulding process Between, and liquid doab R2 should be gone out and be connected to a plurality of liquid stream road out being arranged side by side.Coolant liquid is imported by inlet tube 13 Feed liquor doab R1, then arrow in Fig. 7 respectively enter in the feed liquor runner being arranged side by side, and turn in the end of feed liquor runner Arrow after curved again in Fig. 7 respectively enters in the liquid stream road out being arranged side by side, and is pooled to out liquid in the end in liquid stream road out Doab R2 is finally discharged from outlet 14.Due to coolant liquid during flowing to outlet 14 from inlet tube 13 temperature It gradually rising, the cabinet 1 at feed liquor runner and the cabinet 1 at liquid stream road out generally have the temperature difference, therefore, this stream The layout in road can make the temperature of cell assembly 2 relatively uniform.

By taking cavity 20 is built into phase-change material as an example, battery pack is further provided with temperature control device, to control phase-change material Temperature.When the temperature of the cell assembly 2 of battery pack is lower than minimum target temperature, pass through the phase transformation material in heating cavities 20 Material is allowed to discharge thermal energy during being liquid by Solid State Transformation, so that heat is provided for cell assembly 2, in order to vehicle Cell assembly 2 can be quickly heated after berthing in cold environments.When the temperature of the cell assembly 2 of battery pack is higher than most When high target temperature, by reducing the temperature of the phase-change material in cavity 20, it is allowed to during being changed into solid by liquid The thermal energy of cell assembly 2 is absorbed, so as to quickly remove the heat of cell assembly 2.The temperature of entire cell assembly 2 Degree is evenly distributed, and improves the thermal management effect of cell assembly 2.

In addition, a plurality of feed liquor runner and a plurality of time liquid stream road being arranged side by side can when cavity 20 is built into phase-change material To be interconnected, can also not be connected to mutually.

It it should be noted that the runner that a plurality of cavities 20 are formed is not limited to example shown in fig. 6, such as can also be S-shaped Runner, rectangular-ambulatory-plane runner etc., specifically can be according to structurally reasonable 20 shape of layout a plurality of cavities of the cell assembly 2 in battery pack At runner path, repeat no more.

Although being formed in bottom wall 111 above for description is facilitated as example using cavity 20 and being illustrated, it should be understood that , the cabinet 1 of exemplary embodiment according to the present utility model is equally applicable to the structure that cavity 20 is formed in side wall 112, It is also applied for the structure that cavity 20 is formed in bottom wall 111 and side wall 112, is repeated no more.

Refering to Fig. 8, the utility model embodiment additionally provides a kind of cabinet 1 for battery pack, with case shown in Fig. 3 1 structure of body is similar, the difference is that, isolated island 30 is provided in cavity 20.

Also referring to Fig. 8 and Fig. 9, still it is illustrated so that a plurality of cavities 20 are formed on bottom wall 111 as an example.Bottom wall A plurality of cavities 20 on 111 are interconnected to form runner R.

Wall portion 11 is including being first substrate 21 and the second substrate 22, and first substrate 21 and the second substrate 22 are by accommodation space 10 to cabinet 1 outside direction be laminated, cavity 20 by outwardly convex in the second substrate 22 convex wall 221 and be located at first substrate 21 Flat wall 211 upper and corresponding with convex wall 221 surrounds, and isolated island 30 is recessed by convex wall 221 towards flat wall 211.Second Substrate 22 can be improved the rigidity of the second substrate 22, mention by being respectively formed convex wall 221 in opposite direction and forming isolated island 30 Rise the bearing capacity of cabinet 1.Further, convex wall 221 includes the side 2212 at top 2211 and connection top 2211, top 2211 be plane or arcwall face, and top 2211 and 2212 rounding off of side, the corresponding convex wall 221 of isolated island 30 attaches to flat In straight wall 211.The part external force for acting on convex wall 221 can be transferred to first substrate 21 via isolated island 30, can further improve sky The impact resistance of chamber 20 and cabinet 1, while the ratio of briquetting of cabinet 1 can be also promoted, avoid the torsional deformation due to cavity 20 from damaging Bad cabinet 1.In addition, the side of isolated island 30 and 221 rounding off of convex wall, can also reduce the phase-change material of coolant liquid or liquid Flow through the resistance of 30 side of isolated island.

Further, when being equipped with isolated island 30 in cavity 20, the volume of cavity 20 is opposite to be reduced.In order to promote cavity 20 Volume, the height h and the ratio range of width W of cavity 20 may be configured as: h/W≤1.

A plurality of cavities 20 are interconnected to form runner R, and isolated island 30 is located in runner R.The quantity of isolated island 30 be it is multiple, Multiple isolated islands 30 are arranged in a column or two column or more along the length direction of runner R.Multiple isolated islands 30 effectively enhance cavity 20 Pressure-resistant performance, and can guarantee to form multiply when the phase-change material of coolant liquid or liquid flows through the runner of the formation of cavity 20 Turbulent flow keeps the Temperature Distribution in wall portion 11 more uniform, improves the heat exchange efficiency of cell assembly 20.

Refering to Fig. 9, isolated island 30 attach to the part of flat wall 211 shape be strip or ellipse, the long side of strip or The elliptical long axis of person is parallel to the length direction setting of runner R.During inflation molding, length direction of the medium along runner R Mobile, the long axis of isolated island 30 is arranged along the direction runner R, can promote the ratio of briquetting of runner R, and strip or elliptical shape opposite can increase The contact area of isolated island 30 and first substrate 21, isolated island 30 deforms during avoiding inflation from forming.

Preferably, the length dimension of isolated island 30 is L, width dimensions W1, the length of isolated island 30 and the ratio range of width For 2≤L/W1≤5, wherein the value range of length dimension L are as follows: 5mm≤L≤15mm, the length or broad-ruler of isolated island 30 When very little excessive, the flow resistance in cavity 20 will affect, length or width dimensions are too small, are easy to cause 20 inflation of cavity broken It splits or structural strength is insufficient.

The distance between center and the unilateral edge of cavity 20 of isolated island 30 are the first spacing L1, the first spacing L1 >=isolated island 30 width dimensions W1.When multiple isolated islands 30 are arranged in two column or more along the length direction of runner R, two adjacent column isolated islands 30 The distance between center can be considered as the first spacing L1, and L1 >=W1.As L1 < W1,20 inflation of cavity is easy to cause to rupture.

On the length direction of runner R, the distance between two adjacent isolated islands 30 are the second spacing L2 in each column.It is preferred that Ground, the second spacing L1 of spacing L2 >=first are easy to cause 20 inflation of cavity to rupture as second spacing L2 < the first spacing L1.

Cabinet 1 provided by the embodiment of the utility model for battery pack, by being set in a plurality of cavities 20 of wall portion 11 Isolated island 30 is set, the structural strength of cabinet 1 and cavity 20 can not only be improved, the flow and stream of fluid in cavity 20 can also be changed Speed keeps the Temperature Distribution in wall portion 11 more uniform, improves the heat exchange efficiency of cell assembly 2, further improves battery pack Thermal management effect.

Referring again to Fig. 2, above-mentioned any cabinet 1 for battery pack includes supporting element 15, and supporting element 15 is fixed on On bottom wall 111, it is provided with multiple threaded holes on supporting element 15, is provided with through-hole on the fixed frame of cell assembly 2, passes through spiral shell Cell assembly 2 is fixed in accommodation space 10 by nail across the threaded hole.Lid 3 is covered on the opening of cabinet 1, with cabinet 1 accommodation space 10 forms the enclosure space for accommodating cell assembly 2.

In order to further increase the thermal management effect of cell assembly 2, the inner surface and cell assembly 2 of bottom wall 111 it Between can be with coated with thermally conductive glue, so that heat quickly transmits between cell assembly 2 and cavity 20.

Cabinet 1 further includes protector 16, and protector 16 is fixed at the edge 17 of cabinet 1 around cavity 20, whole to support A cabinet 1 protects cavity 20 from being damaged by extraneous component, while battery pack can also be fixed on vehicle by protector 16 Or other component.

In addition, the utility model embodiment additionally provides a kind of battery pack, foregoing any cabinet 1 is used, The heat exchange efficiency for improving cell assembly 2 improves the thermal management effect of battery pack.

Although the present utility model has been described by reference to the preferred embodiments, but in the model for not departing from the utility model In the case where enclosing, various improvement can be carried out to it and can replace component therein with equivalent.Especially, as long as not depositing In structural conflict, items technical characteristic mentioned in the various embodiments be can be combined in any way.The utility model It is not limited to specific embodiment disclosed herein, but is included all technical solutions falling within the scope of the claims.

Claims (12)

1. a kind of cabinet (1) for battery pack, wherein the cabinet (1) has accommodation space (10) and empty with the receiving Between (10) opening for being connected to, the accommodation space (10) encloses by the wall portion (11) of the cabinet (1), the wall portion (11) It is laminated and is formed by two layers or more of substrate, a plurality of cavities (20) are formed between two layers or more of the substrate.

2. cabinet (1) according to claim 1, which is characterized in that the substrate includes first substrate (21) and the second base Plate (22), the cavity (20) is by the convex wall (221) of outwardly convex on the second substrate (22) and positioned at the first substrate (21) on and flat wall corresponding with the convex wall (221) (211) surrounds.

3. cabinet according to claim 2, which is characterized in that the first substrate (21) and the second substrate (22) by The outside direction of the accommodation space (10) to the cabinet (1) is stacked.

4. cabinet according to claim 2, which is characterized in that the convex wall (221) includes top (2211) and is connected to The side (2212) of the top (2211), the top (2211) are plane or arcwall face, the top (2211) and institute State side (2212) rounding off.

5. cabinet (1) according to claim 2, which is characterized in that the value range of the wall thickness t of the wall portion (11) are as follows: 1mm≤t≤6mm, the ratio range of the wall thickness t2 of the wall thickness t1 and convex wall (221) of the flat wall (211) are as follows: 0.5≤ T2/t1≤1, the value range of the height h of the cavity (20) are as follows: h≤5 × t1, and the height h and width of the cavity (20) The ratio range of W are as follows: h/W≤0.5.

6. cabinet (1) according to any one of claims 1 to 5, which is characterized in that the wall portion (11) includes bottom wall (111) it and encloses in the side wall (112) of the bottom wall (111) side, the cabinet (1) further includes by the accommodation space (10) The eaves portion (12) that extends to all side directions far from the accommodation space (10) of opening, and the bottom wall (111), the side wall (112) it is an integral molding structure with the eaves portion (12).

7. cabinet (1) according to claim 6, which is characterized in that the intersection between the side wall (112) of adjacent two With minimum range d >=25mm between the cavity (20).

8. cabinet (1) according to claim 6, which is characterized in that the multiple cavity (20) is interconnected to form stream Road (R).

9. cabinet (1) according to claim 8, which is characterized in that be arranged on the side wall (112) of the cabinet (1) Have an inlet tube (13) and outlet (14), the inlet tube (13) and the outlet (14) respectively with the runner (R) two End connection, and the inlet tube (13) and the outlet (14) are located at the ipsilateral of the side wall (112).

10. cabinet (1) according to claim 1, which is characterized in that the tensile strength sigma of the material of the substrate >= 100Mpa, elongation at break >=12% of the material of the substrate.

11. cabinet (1) according to claim 2, which is characterized in that the cavity (20) is formed by inflation moulding process Between the first substrate (21) and the second substrate (22).

12. a kind of battery pack characterized by comprising

Cell assembly (2)；

Cabinet (1) as described in any one of claim 1 to 11；

Lid (3) is covered on the opening of the cabinet (1), to be formed with the accommodation space (10) of the cabinet (1) Accommodate the enclosure space of the cell assembly (2).