CN210006791U - Housing and power battery pack - Google Patents

Abstract

The utility model relates to a power battery wraps technical field, in particular to kinds of casings and power battery package, casing (1) include closing cap (11) and have the open-ended frame, closing cap (11) lid is located the frame is in order to seal the opening forms the cavity that is used for installing electric core (3), the frame be provided with be used for to feed through runner (15) pour into the feed liquor pipe (13) of insulating coolant liquid into, be used for the circulation feed through runner (15) of coolant liquid and be used for following feed through runner (15) are outwards discharged feed through runner (14) of insulating coolant liquid the casing is through setting up the feed through runner at the frame to make insulating coolant liquid can flow in the feed through runner, directly carry out cooling process to the electric core, avoided among the prior art through set up other media and the poor problem of cooling effect that leads to between coolant liquid and electric core, improved the cooling efficiency of electric core greatly, reduced the thermal resistance, optimized the quick charge efficiency of electric core.

Description

Housing and power battery pack

technical field

The utility model relates to the technical field of power battery packs, in particular to a casing and a power battery pack.

Background technique

During the use of the power battery pack, the temperature is too high due to the heating of the module, which affects the electrical performance of the power battery pack. At present, the cooling methods of power battery packs are mainly divided into two types: natural cooling and liquid cooling. Among them, the cooling effect of liquid cooling is significantly higher than that of natural cooling. Specifically, using liquid cooling is mainly: arranging cooling pipelines at the bottom or side of the module to cool the bottom or side of the cell accordingly. However, this liquid cooling method has at least two layers of medium between the cooling liquid and the cell: the cooling plate and the thermal pad, so that the thermal resistance of this cooling method is generally at the level of 2.5-3K/W, which is limited to meet the The fast charging speed of the 1.5C-2C battery cell cannot further make the battery cell meet the use requirement of the 3C-4C charging rate, and the charging efficiency is limited, resulting in that the charging efficiency of the battery pack cannot meet the latest needs of the market.

Utility model content

In view of this, the present utility model aims to provide a casing and a power battery pack to solve the problems in the prior art due to the use of additional structures such as arranging cooling pipes at the bottom or side of the module and adding cooling plates and thermal pads. The liquid-cooling method of the battery cell leads to a serious limitation of the charging efficiency and the inability to meet the fast charging demand of the market.

In order to achieve the above object, the technical scheme of the present utility model is achieved in this way:

A case, the case includes a cover and a frame with an opening, the cover is covered on the frame to close the opening and form a cavity for installing batteries, the frame is provided with A liquid inlet pipe for injecting insulating cooling liquid into the communication flow passage, a communication flow passage for circulating the cooling liquid, and a liquid outlet pipe for discharging the insulating cooling liquid outward from the communication flow passage.

Optionally, the communication channel is configured as an annular channel formed along the extending direction of the circumferential wall of the frame.

Optionally, the annular flow channel is configured as a closed-loop structure.

Optionally, the frame includes an end plate and a rectangular frame, the end plate and the cover are respectively sealed and connected to two ends of the rectangular frame, and the rectangular frame includes a pair of first plates facing each other and A pair of opposite second plates, the pair of second plates are arranged between the pair of first plates and the two sides are respectively sealed with the pair of first plates, and the communication channels are located in the pair of the first plates. The first plate is communicated with the liquid inlet pipe and the liquid outlet pipe respectively.

Optionally, a pair of the first plates is formed with a hollow cavity, and a pair of the second plates includes a U-shaped groove protruding outward and a structural adhesive disposed on the top wall of the U-shaped groove, so that the structure The glue can be adhered to the outer surface of the battery core so that the U-shaped groove and the outer surface of the battery core can form a packaging flow channel together, and the hollow cavity and the packaging flow channel are communicated with each other to form the Describe the communication channel.

Optionally, the encapsulation flow channel is configured to gradually increase in cross-sectional area along a direction from the first plate in communication with the liquid inlet pipe to the first plate in communication with the liquid outlet pipe.

Optionally, the bottom wall of the U-shaped groove is set to a trapezoidal structure;

And/or, a side of the U-shaped groove adjacent to the first plate communicating with the liquid outlet pipe is configured as a constriction structure.

Optionally, the first plate includes a first inner plate and a first outer plate attached and disposed outside the first inner plate, the first inner plate is formed with the hollow cavity, and the first outer plate is formed with the hollow cavity. The plate is formed with mounting holes.

Optionally, a weight reduction cavity is formed on the first inner plate and the first outer plate.

Compared with the prior art, the housing of the present invention has the following advantages:

The casing is provided with a communication channel on the frame, so that the insulating cooling liquid can flow in the communication channel, and the battery core is directly cooled, avoiding the need to set other media between the cooling liquid and the battery core in the prior art. The resulting problem of poor cooling effect greatly improves the cooling efficiency of the battery cell, reduces the thermal resistance, and optimizes the fast charging efficiency of the battery cell.

Another object of the present invention is to propose a power battery pack to solve the problem that the power battery pack in the prior art uses additional structures such as arranging cooling pipes at the bottom or side of the module and adding cooling plates and thermal pads. The way the core is liquid-cooled leads to a serious limitation of charging efficiency and the inability to meet the fast charging needs of the market.

In order to achieve the above object, the technical scheme of the present utility model is achieved in this way:

A power battery pack, the power battery pack includes an electric core, a structural adhesive and the casing, and the electric core is installed in the cavity formed by the casing.

The advantages of the power battery pack and the above-mentioned housing are the same over the prior art, which will not be repeated here.

Other features and advantages of the present invention will be described in detail in the detailed description section that follows.

Description of drawings

The accompanying drawings constituting a part of the present invention are used to provide further understanding of the present invention, and the schematic embodiments of the present invention and descriptions thereof are used to explain the present invention and do not constitute an improper limitation of the present invention. In the attached image:

1 is an exploded view of a power battery pack according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a casing according to an embodiment of the present utility model;

3 is a schematic structural diagram of a first plate of the housing shown in FIG. 2;

Fig. 4 is the right side view of the first plate shown in Fig. 3;

FIG. 5 is a schematic structural diagram of the frame of the housing shown in FIG. 2 after removing the first plate and the second plate.

Description of reference numbers:

1. Shell; 11. Cover; 13. Liquid inlet pipe; 14. Liquid outlet pipe; 15. Communication channel; 16. Hollow cavity; 17. U-shaped groove; 18. First plate; 20. Second plate ; 21, necking structure; 24, second inner plate; 25, second outer plate; 26, weight reduction cavity; 27, mounting hole; 3, battery core; 4, structural glue;

Detailed ways

It should be noted that the embodiments of the present invention and the features of the embodiments can be combined with each other unless there is conflict.

In addition, the inside and outside mentioned in the embodiment of the present invention refers to the inside and outside of the casing outline.

The present utility model will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

A first aspect of the present invention provides a casing. As shown in FIGS. 1-5 , the casing 1 includes a cover 11 and a frame with an opening. The cover 11 is covered on the frame to close the The opening is formed to form a cavity for installing the battery cell 3. The frame is provided with a liquid inlet pipe 13 for injecting insulating cooling liquid into the communication flow channel 15, a communication flow channel 15 for circulating the cooling liquid, and A liquid outlet pipe 14 for discharging the insulating cooling liquid from the communication channel 15 to the outside.

Through the above solution, the casing 1 is provided with a communication channel on the frame, so that the insulating cooling liquid can flow in the communication channel, and directly cools the battery cells, avoiding the need for the cooling liquid and the battery cells in the prior art. The problem of poor cooling effect caused by setting other media between them greatly improves the cooling efficiency of the battery cells, reduces the thermal resistance, and optimizes the fast charging efficiency of the battery cells. When in use, the insulating cooling liquid is injected into the communication channel 15 of the frame through the liquid inlet pipe 13, so that the cooling liquid flows along the communication channel 15 and cools the battery cells 3 in the casing. It is discharged through the liquid outlet pipe 14 .

In order to fully cool the battery cell 3, the communication channel 15 is arranged as an annular channel formed along the extending direction of the circumferential wall of the frame, and the communication channel 15 is fully utilized to enable the cooling liquid to surround the circumferential wall of the frame The continuous flow achieves uniform cooling of the battery cells 3 . Therein, the annular flow channel can be provided in various reasonable forms, for example, a spiral-shaped flow channel formed around the circumferential wall of the frame.

Further, the annular flow channel is set as a closed-loop structure, and on the premise of comprehensively cooling the battery cell 3, it can also shorten the flow of the cooling liquid through the annular flow in the process of flowing from the liquid inlet pipe 13 to the liquid outlet pipe 14. The flow path of the channel optimizes the cooling effect.

As shown in FIGS. 1 and 2 , the frame includes an end plate and a rectangular frame, the end plate and the cover 11 are sealed and connected to two ends of the rectangular frame, respectively, and the rectangular frame includes a pair of opposite to each other The first plate 18 and a pair of second plates 20 opposite to each other, the pair of second plates 20 are disposed between the pair of the first plates 18 and the two sides are respectively sealed with the pair of the first plates 18 , the communication channel 15 communicates with the liquid inlet pipe 13 and the liquid outlet pipe 14 on a pair of the first plates 18 respectively. For the first plate, it is beneficial for the cooling liquid to uniformly cool the battery core along the second plate, so that the temperature of the two sides of the battery core adjacent to the pair of second plates is balanced, and the electrical performance of the battery core is optimized. Further, in order to optimize the cooling effect of the casing, as shown in FIGS. 1 and 2 , the first plate can be arranged to extend along the short side direction of the rectangular frame, and the second plate can be arranged to extend along the long side direction of the rectangular frame.

In order to optimize the cooling effect of the casing, the communication channel at the second plate can be set to be in direct contact with the surface of the cell and be cooled, that is, the surface of the cell can be used as the side wall of the communication channel, thereby effectively solving the problem of In the prior art, the problem of poor cooling effect caused by mediums such as cooling plates and thermal pads disposed between the cooling liquid and the cells is solved. For example, a pair of the first plates 18 are formed with hollow cavities 16, and a pair of The second plate 20 includes a U-shaped groove 17 protruding outwards and a structural adhesive disposed on the top wall of the U-shaped groove 17, so that the structural adhesive can be bonded to the outer surface of the battery cell so that all The U-shaped groove 17 can form a packaging flow channel together with the outer surface of the cell, and the hollow cavity 16 and the packaging flow channel communicate with each other to form the communication channel 15 . Among them, the U-shaped groove 17 can be set in various reasonable forms. For example, the U-shaped groove 17 is set in the middle position of the second board and extends along the long side of the rectangular frame, which is conducive to the connection between the cell through the structural adhesive and the U-shaped groove. The top wall is sealed and connected, so that the U-shaped groove 17 and the surface of the cell form the package flow channel, which reduces or even prevents the cooling liquid in the package flow channel from leaking out. Further, in order to fix the cell, the end plate and the cell can also be bonded and fixed by structural adhesive, which can also prevent the coolant from leaking between the cell and the end plate, ensuring the safety performance of the cell; first The plate 18 and the battery cells can be arranged in various reasonable forms. For example, insulating paper can be arranged between the first plate 18 and the battery cores to ensure good safety performance of the battery cores.

In order to make the cooling effect of the cells more balanced, and to solve the problem of the large temperature difference between the upstream part of the cooling liquid and the downstream part of the cooling liquid due to the gradual temperature rise during the flow of the cooling liquid, the cooling liquid can be rationally designed. The flow rate of the upstream and downstream of the coolant is realized. For example, the encapsulation flow channel is arranged to gradually increase in cross-sectional area along the direction from the first plate 18 communicating with the liquid inlet pipe 13 to the first plate 18 communicating with the liquid outlet pipe 14 , so that the flow of the cooling liquid downstream of the cooling liquid is larger, so that the temperature distribution of the battery cells in the direction along the second plate surface is more uniform.

In order to further optimize the uniformity of the temperature distribution of the cells in the direction along the second plate surface, it can be achieved by improving the contact area between the cooling liquid and the cells, for example, the opening of the U-shaped groove is set to a trapezoidal structure, and the The width of the side of the opening close to the first plate 18 communicating with the liquid inlet pipe 13 is smaller than the side of the opening close to the first plate 18 communicating with the liquid outlet pipe 14, so that The temperature difference of the cells is always within the optimal range. According to some specific embodiments of the present invention, when the thickness of the casing is very small, that is, the depth of the U-shaped groove is very small, the bottom wall of the U-shaped groove (the cavity formed by the second plate facing the casing) The shape of the side wall portion protruding from the outside of the chamber, that is, the side wall portion protruding to the right side of the second plate in FIG. 1 ) can be equal to the opening of the U-shaped groove, specifically, the bottom wall of the U-shaped groove is provided with It is a trapezoidal structure, as shown in Figures 1 and 2, the width of the side of the bottom wall close to the first plate 18 communicating with the liquid inlet pipe 13 is smaller than the width of the bottom wall close to the liquid outlet pipe 13 The tube 14 communicates with the side of the first plate 18 .

Further, the side of the U-shaped groove adjacent to the first plate 18 that communicates with the liquid outlet pipe 14 is provided with a constriction structure 21, which is beneficial for the cooling liquid to fill the entire package flow channel downstream, and improves the performance of the cooling liquid. The cooling effect of the cell downstream of the coolant. According to the present invention, the hollow cavity can be arranged to extend along the short side direction of the rectangular frame and arranged in the middle of the second plate. Further, the hollow cavity can be arranged to have a rectangular cross-section, so that the hollow cavity and the packaging flow channel can be better In order to avoid the leakage of coolant at the connection between the first plate and the second plate, the constriction structure 21 can be set to be adjacent to the U-shaped groove and the first plate 18 that communicates with the liquid inlet pipe 13 The structure of one side is consistent, and both are consistent with the cross section of the hollow cavity.

In order to facilitate the simultaneous provision of a hollow cavity and various mounting holes 27 (for the installation of the battery pack case) that are fluidly isolated from the hollow cavity on the first plate, and to resist the expansion and deformation of the battery cells, for example, as shown in FIGS. 3 and 4 . As shown, the first plate 18 includes a first inner plate and a first outer plate attached to the outside of the first inner plate, the first inner plate is formed with the hollow cavity 16, the first outer plate is formed The plate is formed with mounting holes 27 . Wherein, the first inner plate and the first outer plate can be connected in various reasonable forms, for example, by welding, at this time, the welding seam formed between the first inner plate and the first outer plate can be used for Solder the second board.

In order to reduce the overall weight of the housing, the first inner panel and the first outer panel are formed with a weight reduction cavity 26 . Further, in order to improve the sealing effect of the liquid inlet pipe or the liquid outlet pipe, avoid the leakage of the cooling liquid through the weight reduction cavity caused by the improper installation of the liquid inlet pipe or the liquid outlet pipe or the failure of the bottom to be sealed and welded with the first plate, such as As shown in FIG. 4 , the part of the first outer plate corresponding to the hollow cavity of the first inner plate can be set as a solid structure, and the liquid inlet pipe or the liquid outlet pipe passes through the solid structure and communicates with the hollow cavity. Wherein, the first inner plate and the second outer plate can be set in various reasonable forms, for example, as shown in Figs. The side of the inner plate adjacent to the cover 11 is set as a thin plate structure with a thinner thickness, and the side of the first inner plate adjacent to the end plate is set as a thick plate structure with a thicker thickness, and the thick plate structure is formed with a weight-reducing cavity and a thin plate structure. In the hollow cavity, the board surface of the first inner plate adjacent to the cell is set as a plane structure, and the side of the first outer plate adjacent to the cover 11 is set as a thin plate structure with a thinner thickness, and the adjacent end of the first outer plate is set as a thin plate structure. One side of the plate is set as a thick plate structure with a thicker thickness, and the thick plate structure is formed with a weight-reducing cavity and a solid structure.

A second aspect of the present utility model provides a power battery pack. The power battery pack includes a battery cell 3 , a structural adhesive 4 and the casing 1 . inside the chamber. Wherein, the surface of the cell 3 along the extending direction of the circumferential wall of the frame may be provided with an insulating structure, such as an insulating coating, to prevent the cooling liquid from intruding into the cell and ensure the safety performance of the cell.

The above descriptions are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the within the scope of protection of the present invention.

Claims (10)

1. A casing, characterized in that the casing (1) comprises a cover (11) and a frame having an opening, the cover (11) being covered on the frame to close the opening and form A chamber for installing the battery cell (3), the frame is provided with a communication channel (15) for circulating an insulating cooling liquid, and a liquid inlet for injecting the insulating cooling liquid into the communication channel (15) A pipe (13) and a liquid outlet pipe (14) for discharging the insulating cooling liquid from the communication channel (15). 2 . The housing according to claim 1 , wherein the communication channel ( 15 ) is provided as an annular flow channel formed along the extending direction of the circumferential wall of the frame. 3 . 3. The housing according to claim 2, wherein the annular flow channel is configured as a closed-loop structure. 4. The housing according to claim 3, characterized in that, the frame comprises an end plate and a rectangular frame, and the end plate and the cover (11) are sealed and connected to both ends of the rectangular frame, respectively, The rectangular frame comprises a pair of first plates (18) opposite to each other and a pair of second plates (20) opposite to each other, and the pair of second plates (20) are arranged on the pair of first plates (18) ) and on both sides are sealed with a pair of the first plates (18) respectively, and the communication channel (15) is respectively connected with the liquid inlet pipe (13) between the pair of first plates (18). communicate with the liquid outlet pipe (14). 5. The housing according to claim 4, characterized in that a pair of said first plates (18) are formed with hollow cavities (16), and a pair of said second plates (20) comprise U protruding outwards The groove (17) and the structural adhesive arranged on the top wall of the U-shaped groove (17), so that the structural adhesive can be bonded to the outer surface of the battery cell and thus the U-shaped groove (17) can be An encapsulation flow channel is formed together with the outer surface of the cell, and the hollow cavity (16) and the encapsulation flow channel communicate with each other to form the communication flow channel (15). 6. The housing according to claim 5, characterized in that, the encapsulation flow channel is arranged to extend from the first plate (18) communicating with the liquid inlet pipe (13) to the liquid outlet The direction cross-sectional area of the first plate (18) in which the tubes (14) are communicated increases gradually. 7. The housing according to claim 6, wherein the bottom wall of the U-shaped groove is arranged in a trapezoidal structure; And/or, a side of the U-shaped groove adjacent to the first plate (18) communicating with the liquid outlet pipe (14) is provided with a constriction structure (21). 8. The casing according to claim 5, characterized in that the first plate (18) comprises a first inner plate and a first outer plate that is fitted and arranged outside the first inner plate, the first plate (18) An inner plate is formed with the hollow cavity (16), and the first outer plate is formed with a mounting hole (27). 9. The housing according to claim 8, wherein the first inner plate and the first outer plate are formed with a weight reduction cavity (26). 10. A power battery pack, characterized in that the power battery pack comprises a battery cell (3), a structural adhesive (4) and the casing (1) according to any one of claims 1-9, so The battery cell (3) is installed in the cavity formed by the casing (1).

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