CN220400805U

CN220400805U - Battery pack, power device and energy storage device

Info

Publication number: CN220400805U
Application number: CN202321964023.5U
Authority: CN
Inventors: 刘学文; 赵向阳
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2023-07-24
Filing date: 2023-07-24
Publication date: 2024-01-26
Anticipated expiration: 2033-07-24

Abstract

The utility model provides a battery pack, a power device and an energy storage device, wherein the battery pack comprises a lower box body, a cover plate arranged on the lower box body, two-phase immersed cooling liquid filled in the lower box body and a battery module immersed in the two-phase immersed cooling liquid; the battery module comprises at least two rows of cell assemblies which are sequentially arranged along the width direction, each row of cell assemblies is internally provided with a plurality of cylindrical cells which are sequentially arranged along the length direction, and a first cooling plate is clamped between the two rows of cell assemblies. The battery pack disclosed by the utility model can shorten the temperature difference between the cylindrical battery cells, so that the battery pack has good temperature uniformity, the service life of the whole pack is prolonged, meanwhile, the insulation and pressure resistance of the whole pack can be improved, the internal gap can be reduced under the condition that the insulation and pressure resistance of the whole pack is kept unchanged, the design size of the whole pack is reduced, and the whole pack design and development are facilitated.

Description

Battery pack, power device and energy storage device

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery pack, and simultaneously relates to a power device provided with the battery pack and an energy storage device provided with the battery pack.

Background

The cylindrical battery has high capacity, long cycle life and wide use environment temperature. At present, battery modules assembled from cylindrical batteries also have the following problems:

1. when the electric quantity design value is large, the battery module is also large, the length of the side cooling plate is large, and the battery module is locally cooled, so that the temperature difference of the battery module is large;

2. when the battery module is designed to be larger, electric connection with U-shaped design is sometimes needed, and the two middle rows of electric cores are required to be larger in safety clearance, so that the width of the battery module is increased, and the whole occupied space is large;

3. for the quick-charging scheme, a cold plate is required to be arranged at the top of the battery module for cooling, at the moment, a heat conduction structure is required to be bonded with the cold plate at the top, and a sampling point is easy to open and weld with the tab and is in virtual connection with the tab;

4. in the fast charging scheme, the output electrode of the battery module is large in current carrying capacity, larger sectional area size is required to be designed, the copper bar is used in a large amount, the occupied space is large, and the heating is serious.

Disclosure of Invention

In view of the above, the present utility model is directed to a battery pack having good temperature uniformity, and capable of improving the service life of the whole pack.

In order to achieve the above purpose, the technical scheme of the utility model is realized as follows:

a battery pack comprises a lower box body, a cover plate arranged on the lower box body, two-phase immersed cooling liquid filled in the lower box body, and a battery module immersed in the two-phase immersed cooling liquid;

the battery module comprises at least two rows of battery cell assemblies which are sequentially arranged along the width direction, each row of battery cell assemblies is internally provided with a plurality of cylindrical battery cells which are sequentially arranged along the length direction, and a first cooling plate is clamped between the two rows of battery cell assemblies.

Further, the battery module is provided with an output stage conductive bar for current transmission; the battery cell assemblies of each row are connected with each other and the cylindrical battery cells in each row of battery cell assemblies are connected with each other through a bus bar; the output stage conductive bars and each of the bus bars are immersed in the two-phase immersion cooling liquid.

Further, the cover plate adopts a second cooling plate; and/or the two-phase immersed cooling liquid adopts a fluoridation liquid.

Further, the cover plate is connected with the lower box body through a sealing strip.

Further, the lower box body comprises a tray for supporting each cylindrical battery cell and a shell arranged on the tray.

Further, a glue filling area is formed at the bottom of the lower box body; at least the bottom of the tray, the shell and each cylindrical cell are sealed together by sealant filled in the sealant filling area.

Further, an opening through which the first cooling plate passes is formed in the shell, and the first cooling plate and the shell are arranged in a sealing mode at the opening.

Further, the shell adopts an aluminum shell.

Compared with the prior art, the utility model has the following advantages:

according to the battery pack, the first cooling plate can be used for cooling the side parts of the cylindrical battery cells in a direct contact manner, and part of the cylindrical battery cells which are not in contact with the first cooling plate in each row of battery cell assemblies can be indirectly cooled by the two-phase immersed cooling liquid, so that the temperature difference between the cylindrical battery cells can be shortened, the battery pack has good temperature uniformity, the service life of the whole pack is prolonged, meanwhile, the two-phase immersed cooling liquid fully covers the battery module, the insulation pressure resistance of the whole pack can be improved, the internal gap can be reduced under the condition that the insulation pressure resistance of the whole pack is kept unchanged, the design size of the whole pack is reduced, the whole pack integration is improved, and the whole pack has good use effect.

In addition, the output stage conductive bars and the bus bars are immersed in the two-phase immersion type cooling liquid, so that the miniaturized design of the output stage conductive bars is facilitated, the occupied space is reduced, the bus bar cooling effect is good, and the whole bag is supported to be suitable for the high-rate quick-charging working condition. The apron adopts the second cooling plate, can make the top area of battery package cool off, under this condition, need not to use heat conduction structure, is favorable to the design of sampling assembly, and does not have the virtual risk of connecing. The two-phase immersed cooling liquid adopts the fluorinated liquid and has the advantages of boiling point and thermal stability required by two-phase immersed cooling operation, nonflammability, high reliability and safety and the like.

In addition, the cover plate is connected with the lower box body through the sealing strip, so that the overall tightness of the battery pack can be ensured. The bottom of lower box sets up the encapsulating area, and the bottom of tray, casing and each cylinder electricity core is sealed together through the sealant that pours into in the encapsulating area, easy operation, and the leakproofness is good. At the opening part, the first cooling plate and the shell are arranged in a sealing way, so that the sealing performance of the whole package can be ensured.

Another object of the present utility model is to propose a power plant in which the battery pack as described above is arranged. Meanwhile, it is still another object of the present utility model to provide an energy storage device in which the battery pack as described above is provided.

Compared with the prior art, the power device, the energy storage device and the battery pack have the same beneficial effects, and are not described in detail herein.

Drawings

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 utility model. In the drawings:

fig. 1 is a schematic view of the overall structure of a battery pack according to an embodiment of the present utility model;

fig. 2 is an exploded view of a battery pack according to an embodiment of the present utility model;

fig. 3 is a schematic view illustrating a part of a structure of a battery pack according to an embodiment of the present utility model;

reference numerals illustrate:

1. a lower box body; 11. a tray; 12. a housing; 121. an opening; 13. a glue filling area; 14. a submerged zone;

2. a cover plate;

3. a battery module; 31. a cylindrical cell; 32. a busbar;

4. a first cooling plate;

5. and (5) a sealing strip.

Detailed Description

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other.

In the description of the present utility model, it should be noted that, if terms indicating an orientation or positional relationship such as "upper", "lower", "inner", "outer", etc. are presented, they are based on the orientation or positional relationship shown in the drawings, only for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, if any, are also used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Furthermore, in the description of the present utility model, the terms "mounted," "connected," and "connected," are to be construed broadly, unless otherwise specifically defined. For example, the connection can be fixed connection, detachable connection or integrated connection; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art in combination with specific cases.

The utility model will be described in detail below with reference to the drawings in connection with embodiments.

Example 1

The embodiment relates to a battery pack, which can shorten the temperature difference between each cylindrical battery core 31, has good temperature uniformity, prolongs the service life of the whole pack, reduces the internal clearance under the condition of keeping the insulation and pressure resistance of the whole pack unchanged, reduces the design size of the whole pack, and is beneficial to the improvement of the energy density of the whole pack.

As shown in fig. 1 to 3, the battery pack of the present embodiment includes a lower case 1, a cover plate 2 provided on the lower case 1, a two-phase immersion type cooling liquid filled in the lower case 1, and a battery module 3 immersed in the two-phase immersion type cooling liquid.

The battery module 3 includes at least two rows of electric core components that arrange in proper order along the width direction, all has a plurality of cylinder electric core 31 that arrange in proper order along length direction in every row of electric core component to press from both sides between two rows of electric core components and be equipped with first cooling plate 4.

It can be understood that in this embodiment, when the temperature of the two-phase immersed cooling liquid reaches the boiling point temperature due to heat generation of the electrical components inside the battery pack, the two-phase immersed cooling liquid will boil and vaporize to a vapor state, and condense at the first cooling plate 4, and phase-change back to the liquid, so that the reciprocating cycle cools the electrical components.

Of course, the two-phase immersion cooling liquid in the vapor state also rises to the top cover plate 2, and at this time, based on the heat exchange between the cover plate 2 and the outside, part of the two-phase immersion cooling liquid in the vapor state is condensed to become liquid reflux, and is matched with the first cooling plate 4 to cool the inside of the battery pack.

Specifically, in the present embodiment, as a preferred embodiment, the battery module 3 has an output stage conductive bar for current transmission. Meanwhile, the battery cell assemblies of each row and the cylindrical battery cells 31 in each row are connected through a bus bar 32. The output stage conductor bars and each bus bar 32 are immersed in a two-phase immersion coolant.

It can be understood that the output stage conductive bars and each of the bus bars 32 are immersed in the two-phase immersion cooling liquid, which is favorable for miniaturized design of the output stage conductive bars, reduces occupied space, ensures that the bus bars 32 have good cooling effect, supports the whole package to be suitable for high-rate quick-charging working conditions, and is favorable for design and development of a quick-charging scheme.

Moreover, the output-stage conductive bars and each bus bar 32 are immersed in the two-phase immersion type cooling liquid, so that the complete immersion of the electric components such as the cell module, the bus bars 32 and the output-stage conductive bars is realized, namely the design of complete contact cooling with the two-phase immersion type cooling liquid is beneficial to realizing the better cooling effect on the electric components such as the cell module, the bus bars 32 and the output-stage conductive bars.

In particular, in this embodiment, as a preferred implementation manner, the cover plate 2 adopts the second cooling plate, so that the top belt of the battery pack is cooled, and under this condition, a heat conduction structure is not required, which is favorable for the design of the sampling assembly, and no virtual connection risk exists.

Furthermore, it can be understood that the cover plate 2 adopts the second cooling plate, can promote the cooling effect at top, when joining in marriage with the first cooling plate 4, can promote the cooling effect to the inside cooling of battery package, and then do benefit to the development and the design of quick charge scheme.

It should be noted that, in this embodiment, both the second cooling plate and the first cooling plate 4 may be a cold plate product known to those skilled in the art, such as a water cooling plate, and only when the first cooling plate 4 is specifically disposed, the first cooling plate 4 needs to be disposed in a structure adapted to two adjacent rows of the cell assemblies;

for example, the first cooling plate 4 is provided with a groove attached to each cylindrical battery cell 31 in each row of battery cell assemblies, a protruding part capable of penetrating into a gap between two adjacent cylindrical battery cells 31 in each row of battery cell assemblies, and the like, so that the overall structure stability of the battery module 3 is better, and the structure is also more compact.

Of course, when the first cooling plate 4 is specifically set, it is only necessary to set and adjust the cooling requirement of the battery module 3, for example, as shown in fig. 3, the battery modules 3 are two groups arranged at intervals along the width direction, each group of battery modules 3 has four rows of battery cell assemblies arranged along the width direction, each battery cell assembly has a plurality of cylindrical battery cells 31 arranged in sequence along the length direction, and the first cooling plate 4 is two of the first row of battery cell assemblies and the second row of battery cell assemblies, and the third row of battery cell assemblies and the fourth row of battery cell assemblies arranged in each group of battery modules 3.

The width direction of the present embodiment refers to the width direction of the battery pack, and the length direction refers to the length direction of the battery pack.

At the same time, as a preferred embodiment, the two-phase immersion cooling liquid is a fluorinated liquid. The two-phase immersed cooling liquid adopts the fluoridation liquid, and has the advantages of boiling point and thermal stability required by two-phase immersed cooling operation, nonflammability, high reliability and safety and the like. The fluorination liquid may be an electronic fluorination liquid having a boiling point of 34 to 174℃and may be, for example, 34℃or 35℃or 50 ℃.

In this embodiment, a fluorinated liquid with a boiling point of 35 ℃ is taken as an example, because the fluorinated liquid is filled in the battery pack, the fluorinated liquid wets and submerges each cylindrical cell 31, the busbar 32, the output-stage conducting bar and the like in the battery pack, and is used for cooling, when the temperature of the fluorinated liquid reaches the boiling point temperature of 35 ℃ due to heat generation of electric components in the battery pack, the fluorinated liquid is boiled and vaporized into a vapor state, heat exchange is performed with the first cooling plate 4 in the rising process, and heat exchange is performed with the second cooling plate (the cover plate 2) at the top in the rising process, condensation is performed to form liquid reflux, and thus the reciprocating circulation is used for cooling the electric components, thereby realizing cooling and cooling of the battery pack.

In addition, in the present embodiment, as a preferred embodiment, as shown in fig. 2, the cover plate 2 and the lower case 1 are connected by a sealing strip 5 to ensure sealability of the entire battery pack.

In addition, in this embodiment, as a preferred embodiment, as shown in fig. 2, the lower case 1 includes a tray 11 for supporting each of the cylindrical cells 31, and a housing 12 provided on the tray 11. In a specific structure, as a preferred implementation manner, as shown in fig. 1, a glue filling area 13 is formed at the bottom of the lower case 1, and at least the tray 11, the case 12 and the bottom of each cylindrical cell 31 are sealed together by sealant filled in the glue filling area 13.

It can be understood that the glue filling area 13 is arranged at the bottom of the lower box body 1, and the bottoms of the tray 11, the shell 12 and the cylindrical battery cells 31 are sealed together through the sealant filled in the glue filling area 13, so that the operation is simple, and the tightness is good.

Furthermore, it should be mentioned that, in the lower case 1 of the present embodiment, an immersed area 14 filled with the two-phase immersion cooling liquid is formed above the sealant, i.e. above the sealant pouring area 13, so that the design ensures the structural stability of the whole package and improves the cooling performance and the temperature uniformity of the whole package.

In addition to the bottom of the tray 11, the housing 12 and each of the cylindrical cells 31, the bottom of the first cooling plate 4 is sealed together by a sealant, if necessary, so that the overall structural stability of the battery pack is higher.

In this embodiment, as a preferred embodiment, the housing 12 is provided with an opening 121 through which the first cooling plate 4 passes, and a seal is provided between the first cooling plate 4 and the housing 12 at the opening 121. The advantage of this arrangement is that the sealing performance of the whole package can be ensured.

Of course, in this embodiment, in addition to the opening 121 for avoiding the first cooling plate 4, an avoiding opening for avoiding the output stage conductive bar is further provided on the housing 12, and at the avoiding opening, the output stage conductive bar and the housing 12 are also sealed, so as to ensure the tightness of the whole package.

Meanwhile, in this embodiment, as a preferred implementation manner, the casing 12 is an aluminum casing, so as to facilitate the light-weight design of the whole package, and meanwhile, the heat dissipation effect and the safety are good. It will be appreciated that the housing 12 may be made of a common plastic material other than aluminum, so as to meet the requirement of light weight, but it should be noted that the heat dissipation effect and safety may not be as good as that of aluminum.

The battery pack of this embodiment, accessible first cooling plate 4 and the direct contact cooling of a plurality of cylinder electric core 31 lateral part, and the partial cylinder electric core 31 of each row electric core subassembly that does not contact with first cooling plate 4, accessible two-phase immersion type coolant liquid carries out indirect cooling, from this can shorten the difference in temperature between each cylinder electric core 31, make this battery pack have good sameness, in order to promote the life of whole package, simultaneously, two-phase immersion type coolant liquid covers battery module 3 design entirely, both can promote whole package insulation withstand voltage performance, also can reduce inside clearance under the unchangeable condition of keeping whole package insulation withstand voltage performance, reduce whole package design size, and then do benefit to promoting whole package integrated level, thereby make whole package have good result of use.

Example two

The present embodiment relates to a power unit in which the battery pack of the first embodiment is provided. Meanwhile, the embodiment also relates to an energy storage device, and the battery pack of the embodiment is also arranged in the energy storage device.

The power device and the energy storage device of the embodiment have long service life through the battery pack in the first embodiment, and can meet the quick charge requirement, so that the battery pack has good use reliability, safety and convenience. The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims

1. A battery pack, characterized in that:

the battery module comprises a lower box body, a cover plate arranged on the lower box body, two-phase immersed cooling liquid filled in the lower box body and a battery module immersed in the two-phase immersed cooling liquid;

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

the battery module is provided with an output stage conductive bar for current transmission;

the battery cell assemblies of each row are connected with each other and the cylindrical battery cells in each row of battery cell assemblies are connected with each other through a bus bar;

the output stage conductive bars and each of the bus bars are immersed in the two-phase immersion cooling liquid.

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

the cover plate adopts a second cooling plate; and/or the two-phase immersed cooling liquid adopts a fluoridation liquid.

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

the cover plate is connected with the lower box body through a sealing strip.

5. The battery pack according to any one of claims 1 to 4, wherein:

the lower box body comprises a tray for supporting each cylindrical battery cell and a shell arranged on the tray.

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

a glue filling area is formed at the bottom of the lower box body;

at least the bottom of the tray, the shell and each cylindrical cell are sealed together by sealant filled in the sealant filling area.

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

the shell is provided with an opening through which the first cooling plate passes, and the opening is sealed between the first cooling plate and the shell.

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

the shell adopts an aluminum shell.

9. A power plant, characterized in that:

the power unit has the battery pack according to any one of claims 1 to 8 disposed therein.

10. An energy storage device, characterized in that:

the battery pack according to any one of claims 1 to 8 is provided in the energy storage device.