CN212848641U

CN212848641U - Battery module

Info

Publication number: CN212848641U
Application number: CN202021465442.0U
Authority: CN
Inventors: 周逸
Original assignee: Evergrande Hengchi New Energy Automobile Research Institute Shanghai Co Ltd
Current assignee: Evergrande Hengchi New Energy Automobile Research Institute Shanghai Co Ltd
Priority date: 2020-07-22
Filing date: 2020-07-22
Publication date: 2021-03-30
Anticipated expiration: 2030-07-22

Abstract

The utility model discloses a battery module, which comprises a battery unit, a heat dissipation bottom plate and a module cover body; the module cover body is connected to the heat dissipation bottom plate and forms an accommodating cavity with the heat dissipation bottom plate in an enclosing mode; the battery unit is arranged in the accommodating cavity and is in contact with the heat dissipation bottom plate; and a cooling liquid circulation cavity is arranged in the heat dissipation bottom plate. The battery unit is in contact with the heat dissipation bottom plate, and a heat transfer path is shortened, so that the heat dissipation efficiency is improved. And only the heat dissipation bottom plate and the module cover body form a shell for installing the battery unit, so that the structure is simplified, and the overall weight is reduced.

Description

Battery module

Technical Field

The utility model relates to an electric motor car equipment field especially relates to a battery module.

Background

The acceleration performance and the cruising ability of the new energy automobile are two very important indexes, and higher requirements are put forward on the output power of the battery.

The battery has certain internal resistance, and can generate larger heat under the condition of high-power use, and if the heat cannot be led out in time, a serious battery thermal runaway event can occur.

The power of the battery during operation is relatively high, and a related heat management assembly needs to be arranged to dissipate heat of the battery. In the prior art, the thermal management assembly is generally disposed at the outside, and the related cooling plate is generally disposed at the outside of the battery module. In this technique, the heat dissipation path of the battery cell is: the battery monomer reaches the inside heat-conducting glue of module to the cooling plate to outside heat-conducting glue, reaches outside thermal management group at last, under this technique, not only the heat dissipation route is longer, and the thermal resistance is great, and spare part is in large quantities moreover, and is with high costs.

Therefore, a solution to the above problem is needed.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a battery module with good radiating effect and easy to assemble.

The technical scheme of the utility model provides a battery module, including battery unit, radiating bottom plate and module cover body; the module cover body is connected to the heat dissipation bottom plate and forms an accommodating cavity with the heat dissipation bottom plate in an enclosing mode; the battery unit is arranged in the accommodating cavity and is in contact with the heat dissipation bottom plate; and a cooling liquid circulation cavity is arranged in the heat dissipation bottom plate.

Furthermore, the front end and the rear end of the heat dissipation bottom plate are respectively provided with a bottom plate extending part extending outwards; the front end and the rear end of the module cover body are respectively provided with a cover body clamping groove for mounting the bottom plate extension part; at least part of the bottom plate extension part is positioned in the cover body clamping groove.

Furthermore, two bottom plate extension parts are respectively provided with a cooling liquid joint; the coolant joint is in communication with the coolant circulation cavity.

Further, the heat dissipation bottom plate comprises an external water cooling plate and an internal water cooling plate in contact with the battery unit; the inner water cooling plate is connected above the outer water cooling plate; the inner water-cooling plate and the outer water-cooling plate form the cooling liquid circulation cavity.

Furthermore, a plurality of reinforcing ribs protruding towards the inner water cooling plate are arranged on the inner side of the outer water cooling plate at intervals.

Furthermore, the battery unit comprises a plurality of battery cell units; a plurality of bottom plate grooves with openings facing the battery cell monomers are formed in the inner water cooling plate at intervals; and the battery cell single body is arranged in one bottom plate groove.

Further, the bottom plate groove is provided with an arc-shaped groove wall, and the battery cell monomer is provided with an arc-shaped lower end part; the circular arc lower end part is contacted with the circular arc groove wall.

Furthermore, a heat insulation cushion layer is arranged between any two adjacent electric core monomers.

Further, a heat-conducting glue layer is arranged in the groove of the bottom plate.

Further, an insulating cushion layer is arranged between the inner side of the module cover body and the battery unit.

The utility model discloses a battery module, including the battery cell, heat dissipation bottom plate and the module cover body. The module cover body is connected to the heat dissipation bottom plate and encloses an accommodating cavity with the heat dissipation bottom plate. The battery unit is installed in the receiving cavity and is in contact with the heat dissipation bottom plate. And a cooling liquid circulation cavity is arranged in the heat dissipation bottom plate. The battery unit is installed in the receiving cavity and is in contact with the heat dissipation bottom plate. The radiating bottom plate is a part of the battery module, and the radiating bottom plate and the module cover body are enclosed to form an accommodating cavity, so that the battery module is convenient to install, and the weight of the battery module can be reduced. And the battery unit is contacted with the heat dissipation bottom plate, so that heat transfer ways are reduced, and the heat dissipation efficiency is improved.

Drawings

Fig. 1 is a perspective view of a battery module according to an embodiment of the present invention;

fig. 2 is an exploded view of a battery module according to an embodiment of the present invention;

fig. 3 is a cross-sectional view of a battery module according to an embodiment of the present invention;

fig. 4 is a cross-sectional view of a heat sink base plate according to an embodiment of the present invention;

fig. 5 is a bottom view of the heat dissipating base plate according to an embodiment of the present invention;

fig. 6 is a schematic view of a cover plate according to an embodiment of the present invention.

Detailed Description

The following describes the present invention with reference to the accompanying drawings. In which like parts are designated by like reference numerals. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.

Fig. 1 to 3 show a battery module 10 according to an embodiment of the present invention, which includes a battery unit 1, a heat dissipation base plate 2, and a module cover 3.

The module cover body 3 is connected to the heat dissipation base plate 2 and encloses an accommodating cavity with the heat dissipation base plate 2.

The battery unit 1 is mounted in the receiving cavity and is in contact with the heat dissipation base plate 2.

A coolant circulation chamber 23 is provided in the heat-radiating base plate 2.

The battery module 10 is commonly used in electric vehicles, and is easy to install and has a good heat dissipation effect. The battery module 10 has a heat-dissipating base plate 2, a module cover 3, and a battery unit 1, and the module cover 3 is mounted on the heat-dissipating base plate 2, preferably, the module cover 3 is mounted on the heat-dissipating base plate 2 by welding. An accommodating cavity is formed between the module cover body 3 and the heat dissipation bottom plate 2, and the battery unit 1 is installed in the accommodating cavity. The heat dissipation bottom plate 2 is provided with a cooling liquid circulation cavity 23, cooling liquid in the cooling liquid circulation cavity 23 can absorb heat, and the cooling liquid is mixed liquid formed by mixing 50% of water and 50% of glycol.

The module housing 3 includes two housing end plates 31, two housing side plates 32, and a housing cover plate 33. The heat radiation base plate 2 is a square straight plate, wherein the length direction is the front-back direction, and the width direction is the left-right direction. The two cover end plates 31 are connected to the heat dissipation base plate 2 at intervals in the front-rear direction, the two cover side plates 32 are connected to the left and right sides of the two cover end plates 31, respectively, and are connected to the heat dissipation base plate 2, and the cover plate 33 is connected to the upper ends of the two cover end plates 31 and the two cover side plates 32. Optionally, the cover plate 33 and the two cover side plates 32 are integrally formed, and the two cover side plates 32 are connected to the left and right sides of the cover plate 33, so that the production is convenient.

The heat dissipation bottom plate 2, the cover body cover plate 33, the two cover body end plates 31 and the two cover body side plates 32 enclose an accommodating cavity. The battery unit 1 is located in the accommodation chamber, and is mounted on the heat dissipation base plate 2 in contact with the heat dissipation base plate 2. So, the heat that battery unit 1 produced can directly transmit to radiating bottom plate 2 on, reduced heat transfer's way to improve the radiating efficiency, make battery module 10 can lower the temperature more fast, guarantee good effect of discharging. The heat dissipation bottom plate 2 is used as a part of the accommodating cavity in a surrounding mode, and is used as the mounting bottom plate of the whole module cover body 3, so that the module cover body 3 is prevented from being connected with an additional mounting bottom plate, the use of production materials is reduced, and the use of mounting parts is realized, the cost is saved, and the mounting is facilitated.

The heat dissipation process of the heat dissipation base plate 2 is as follows, wherein the heat dissipation base plate 2 is provided with two coolant joints 26 communicated with the coolant circulation cavity 23. A coolant device is provided in a vehicle, the coolant device having a coolant inlet pipe, a coolant outlet pipe, a hydraulic pump, which may also be referred to as an electronic water pump, and a liquid storage tank for supplying coolant, which may also be referred to as a liquid storage tank. The import and the liquid storage bucket of hydraulic pump, the export and the coolant liquid import union coupling of hydraulic pump, the coolant liquid outlet pipe is connected on the liquid storage bucket. One of the two coolant connections 26, is connected to the coolant inlet line and defines a first connection; the other coolant connection 26 is connected to a coolant outlet pipe and defines a second connection. The hydraulic pump is started to operate, the hydraulic pump pumps out the cooling liquid in the liquid storage barrel, the cooling liquid enters the cooling liquid inlet pipe through the hydraulic pump and then enters the cooling liquid circulation cavity 23 from the first joint, the cooling liquid flows to the second joint after absorbing heat in the cooling liquid circulation cavity 23 and then enters the cooling liquid outlet pipe and finally flows into the liquid storage barrel to be stored and cooled. After cooling, the liquid can enter the radiating bottom plate 2 again.

The utility model provides a battery module 10, including battery unit 1, radiating bottom plate 2 and the module cover body 3. The module housing 3 includes two housing end plates 31, two housing side plates 32, and a housing cover plate 33 connected to the upper ends of the two housing end plates 31 and the two housing side plates 32. Two cover end plates 31 are arranged on the heat dissipation bottom plate 2 at intervals. The two cover side plates 32 are respectively arranged on two sides of the two cover end plates 31 and connected to the heat dissipation bottom plate 2, and the heat dissipation bottom plate 2 is provided with a coolant circulation cavity 23. The heat-dissipating bottom plate 2, the cover plate 33, the two cover end plates 31 and the two cover side plates 32 define an accommodating cavity. The battery unit 1 is mounted in the receiving cavity and is in contact with the heat dissipation base plate 2. The heat dissipation base plate 2 is a part of the battery module 10, and encloses an accommodating cavity with the module cover 3, so that the installation is convenient, and the weight of the battery module 10 can be reduced. In the battery module 10, the heat dissipation path of the battery unit 1 is from the battery unit 1 to the heat dissipation base plate 2, so that the heat transfer path is reduced, and the heat dissipation efficiency is improved.

In one embodiment, as shown in fig. 1-2 and 5, the front and rear ends of the heat-dissipating base plate 2 are provided with base plate extensions 24 extending outward. The front and rear ends of the module housing 3 are respectively provided with a housing locking groove 311 for mounting the bottom plate extension 24. At least a portion of the base extension 24 is positioned within the housing slot 311.

The module housing 3 includes two housing end plates 31 arranged in the front-rear direction, two housing side plates 32 arranged in the left-right direction, and a housing cover plate 33 connected to the upper ends of the two housing end plates 31 and the two housing side plates 32. A cover body locking groove 311 is provided in the cover body end plate 31. The heat radiation base plate 2 includes a base plate main body 25, and base plate extension portions 24 extending outward are connected to front and rear ends of the base plate main body 25, respectively. And the bottom of two cover body end plates 31 all is provided with a cover body draw-in groove 311, and during the installation, two bottom plate extension portions 24 block respectively in two cover body draw-in grooves 311, and specific casing bottom plate extension portion 24 is fixed bottom plate extension portion 24 and cover body end plate 31 through installation fixing bolt. But of course also by riveting, bolting or welding. Cover body draw-in groove 311 has limiting displacement, avoids radiating bottom plate 2 and cover body end plate 31 before the installation is fixed, and both take place the dislocation, so can easy to assemble. Preferably, the cover body locking groove 311 is disposed at the bottom of the cover body end plate 31. Of course, the present invention may be provided in other portions of the cover end plate 31, and is not limited thereto as long as the present invention can be used for mounting the bottom plate extension 24.

In one embodiment, as shown in FIGS. 1-2 and 5, two floor extensions 24 are each provided with a coolant connection 26. The coolant connection 26 communicates with the coolant circulation chamber 23. The provision of the coolant connections 26 facilitates the communication of the coolant circulation chamber 23 with the outside, for example the connection of two coolant connections 26 with the coolant inlet and outlet pipes. The coolant can smoothly enter the coolant circulation cavity 23, and the bottom plate extension part 24 expands the space for the coolant joint 26, thereby facilitating the installation of the coolant joint 26.

Coolant liquid connects 26 and bottom plate extension portion 24 can be integrated into one piece, also can be detachably connected, and wherein detachable mode is for being provided with on bottom plate extension portion 24 and connect the mounting hole, is provided with the internal thread in connecting the mounting hole, is provided with the external screw thread on the coolant liquid connects 26, and during the installation, the external screw thread that coolant liquid connects 26 and the female connection who connects in the mounting hole.

In one embodiment, as shown in fig. 2-4, heat sink base plate 2 includes an outer water cooling plate 21 and an inner water cooling plate 22 in contact with battery cell 1. The inner water-cooling plate 22 is connected above the outer water-cooling plate 21. A coolant circulation chamber 23 is formed between the inner water-cooling plate 22 and the outer water-cooling plate 21.

The heat dissipation base plate 2 is used for water cooling heat dissipation and is formed by connecting an outer water cooling plate 21 and an inner water cooling plate 22 up and down. The outer water-cooling plate 21 is positioned below the inner water-cooling plate 22, the inner side of the outer water-cooling plate 21 is recessed downward, and the inner water-cooling plate 22 covers the upper side of the outer water-cooling plate 21, so that a cooling liquid circulation cavity 23 is formed between the inner water-cooling plate 22 and the outer water-cooling plate 21. The coolant circulation chamber 23 contains a coolant, such as water. The internal water-cooling plate 22 is in contact with the battery unit 1, heat generated by the battery unit 1 is firstly transferred to the internal water-cooling plate 22, and then the coolant flowing through the cavity 23 absorbs the heat. The mode of adopting the water-cooling heat dissipation is simple and practical, saves the cost, and the heat dissipation bottom plate 2 comprises outer water-cooling board 21 and interior water-cooling board 22, makes things convenient for the manufacturing shaping of heat dissipation bottom plate 2.

In one embodiment, as shown in fig. 2-4, the inner side of the outer water-cooling plate 21 is spaced apart from a plurality of reinforcing ribs 211 that protrude toward the inner water-cooling plate 22. The reinforcing ribs 211 upwardly contact the inner water-cooling plate 22 to support the inner water-cooling plate 22 so that the inner water-cooling plate 22 can bear a greater weight.

In this embodiment, the reinforcing rib 211 is formed by the inner side of the outer water cooling plate 21 protruding upward, and correspondingly, an upward concave groove is formed on the outer side of the outer water cooling plate 21. Thus, the weight of the outer water-cooling plate 21 can be reduced. A plurality of reinforcing ribs 211 are arranged at intervals in the left-right direction, and a coolant passage is formed between adjacent two reinforcing ribs. The arrangement is such that the coolant in the coolant circulation chamber 23 can be divided into a plurality of streams, which respectively flow in different coolant channels, so that the coolant flows more smoothly.

In one embodiment, as shown in fig. 2 to 4, the battery unit 1 includes a plurality of battery cells 11. A plurality of bottom plate grooves 221 with openings facing the battery cell 11 are arranged at intervals on the inner water cooling plate 22. A cell unit 11 is mounted in a bottom plate groove 221.

The upper surface of the inner water-cooling plate 22 is recessed downward to form a plurality of bottom plate grooves 221, and the lower ends of the battery cell units 11 are located in the bottom plate grooves 221. The arrangement of the bottom plate groove 221 limits the positions of the battery cell single bodies 11, and prevents the plurality of battery cell single bodies 11 from moving. And the contact area between the battery cell monomer 11 and the internal water cooling plate 22 is increased, so that the heat of the battery cell monomer 11 can be more efficiently transferred to the internal water cooling plate 22.

In one embodiment, as shown in fig. 2 to 4, the bottom plate groove 221 has a circular arc groove wall 2211, and the single cell 11 has a circular arc lower end 111. The circular arc-shaped lower end portion 111 contacts the circular arc-shaped groove wall 2211. The arc-shaped slot wall 2211 is smooth in surface, and damage to the battery cell 11 caused when the battery cell 11 is mounted can be avoided. And the circular arc lower end part 111 is designed to enable the battery cell single body 11 to be fully contacted with the circular arc groove wall 2211, so that the heat dissipation efficiency is improved.

In one embodiment, as shown in fig. 2 to 3, a thermal insulation cushion layer 12 is disposed between two adjacent battery cells 11.

The battery unit 1 further comprises a plurality of heat insulation cushion layers 12, wherein the plurality of heat insulation cushion layers 12 and the plurality of battery cell monomers 11 are alternately arranged. The arrangement of the heat insulation cushion layer 12 avoids the influence of the heat generated by the cell single body 11 on another adjacent cell single body 11. And the heat insulation cushion layer 12 also avoids the contact between two adjacent electric core single bodies 11, thereby preventing collision damage.

In one embodiment, a heat insulating cushion layer 12 is disposed between the battery unit 1 and the two housing side plates 32 of the module housing 3. Specifically, a plurality of heat insulation cushion layers 12 and a plurality of battery cell monomers 11 are alternately arranged in a row. For convenience of description, the leftmost cell 11 in the row of cell units 11 is defined as a first cell unit, and the rightmost cell unit 11 is defined as a second cell unit. A heat insulation cushion layer 12 is arranged between the first battery cell and one cover body side plate 32, and a heat insulation cushion layer 12 is also arranged between the second battery cell and the other cover body side plate 32. So set up, avoid battery unit 1 and module cover body 3 direct contact.

The heat insulation cushion layer 12 may be aerogel felt such as glass fiber, asbestos, rock wool, silicate, etc., or vacuum plate, etc.

In one embodiment, as shown in fig. 3-4, a layer 2212 of thermally conductive adhesive is disposed in the bottom plate recess 221. The groove wall of each bottom plate groove 221 is coated with a heat-conducting adhesive layer 2212, and the lower end of the battery cell 11 is in contact with the heat-conducting adhesive layer 2212. The heat conducting adhesive layer 2212 has good heat conducting efficiency, and can quickly transfer the heat of the battery cell monomer 11, so that the heat can be transferred to the inner water cooling plate 22 better. And the heat-conducting adhesive layer 2212 has a buffering effect, so that the direct contact between the single battery cell 11 and the internal water cooling plate 22 is avoided, and the single battery cell 11 is protected. Secondly, the heat-conducting adhesive layer 2212 also has an insulating effect, and avoids conducting electricity with the battery cell 11.

The heat conductive adhesive layer 2212 is preferably made of a heat conductive material with high heat conductivity, low density and insulation, and may be made of ultra-high temperature heat conductive adhesive, silicone heat conductive adhesive, epoxy AB adhesive, polyurethane heat conductive adhesive and heat conductive silicone grease, for example.

In one of the embodiments, as shown in fig. 3 and 6, an insulating spacer 4 is provided between the inside of the module case 3 and the battery cell 1.

The module case 3 has a case cover 33, two case end plates 31, and two case side plates 32. The cover end plate 31 is typically an insulating material, such as plastic. The cover side plates 32 and the cover plate 33 are made of metal materials, preferably, aluminum alloy or steel, and the processing mode is sheet metal stamping. So can have better intensity, not fragile. The insulating pad layer 4 can be made of polyethylene terephthalate film, polycarbonate film or polyimide film, and is adhered to the inner side of the module cover body 3 through double-sided adhesive. The module housing 3 can provide external protection for the battery cells on the one hand and can serve as a strength support member on the other hand. And the insulation of the insulating pad 4 prevents the current of the battery cell 1 from leaking to the module case 3 to cause conduction, thereby preventing harm to the outside people or vehicles. The insulating mat 4 may be disposed in various ways, and may be disposed only on the inner side of the module cover plate 33, or may be disposed on both the inner sides of the module cover plate 33 and the module side plate 32. When the heat insulating mat layer 12 is provided between the two module side plates 32 and the battery cell 1, the heat insulating mat layer 4 is provided only on the inner side of the module cover plate 33. When the heat insulating mat layer 12 is not provided between the two module side plates 32 and the battery cell 1, the module cover plate 33 and the inner sides of the module side plates 32 are both provided with the insulating mat layer 4.

To sum up, the utility model provides a battery module, including the battery cell, radiating bottom plate and the module cover body. The module cover body is connected to the heat dissipation bottom plate and encloses an accommodating cavity with the heat dissipation bottom plate. The battery unit is installed in the receiving cavity and is in contact with the heat dissipation bottom plate. And a cooling liquid circulation cavity is arranged in the heat dissipation bottom plate. The radiating bottom plate is a part of the battery module, and the radiating bottom plate and the module cover body are enclosed to form an accommodating cavity, so that the battery module is convenient to install, and the weight of the battery module can be reduced. And the battery unit is contacted with the heat dissipation bottom plate, so that heat transfer ways are reduced, and the heat dissipation efficiency is improved.

According to the needs, the above technical schemes can be combined to achieve the best technical effect.

What has been described above is merely the principles and preferred embodiments of the present invention. It should be noted that, for those skilled in the art, on the basis of the principle of the present invention, several other modifications can be made, and the protection scope of the present invention should be considered.

Claims

1. A battery module (10) is characterized by comprising a battery unit (1), a heat dissipation base plate (2) and a module cover body (3);

the module cover body (3) is connected to the heat dissipation bottom plate (2) and forms an accommodating cavity with the heat dissipation bottom plate (2);

the battery unit (1) is arranged in the accommodating cavity and is in contact with the heat dissipation bottom plate (2);

and a cooling liquid circulation cavity (23) is arranged in the heat dissipation bottom plate (2).

2. The battery module (10) according to claim 1, wherein the heat dissipation base plate (2) has base plate extensions (24) extending outward at the front and rear ends thereof, respectively;

the front end and the rear end of the module cover body (3) are respectively provided with a cover body clamping groove (311) for mounting the bottom plate extension part (24);

at least part of the bottom plate extension part (24) is positioned in the cover body clamping groove (311).

3. The battery module (10) according to claim 2, wherein the two floor extensions (24) are provided with coolant tabs (26), respectively;

the coolant connection (26) communicates with the coolant circulation chamber (23).

4. The battery module (10) according to any one of claims 1 to 3, wherein the heat-dissipating base plate (2) comprises an outer water-cooling plate (21) and an inner water-cooling plate (22) in contact with the battery cells (1);

the inner water cooling plate (22) is connected above the outer water cooling plate (21);

the inner water-cooling plate (22) and the outer water-cooling plate (21) form the coolant circulation cavity (23) therebetween.

5. The battery module (10) according to claim 4, wherein the outer water-cooling plate (21) is provided at intervals inside thereof with a plurality of reinforcing ribs (211) protruding toward the inner water-cooling plate (22).

6. The battery module (10) according to claim 4, wherein the battery unit (1) comprises a plurality of battery cells (11);

a plurality of bottom plate grooves (221) with openings facing the battery cell single bodies (11) are formed in the inner water cooling plate (22) at intervals;

one of the cell units (11) is mounted in one of the bottom plate grooves (221).

7. The battery module (10) according to claim 6, wherein the floor groove (221) has a circular arc groove wall (2211), and the cell unit (11) has a circular arc lower end (111);

the circular arc-shaped lower end part (111) is in contact with the circular arc-shaped groove wall (2211).

8. The battery module (10) according to claim 6, wherein a thermal insulation cushion layer (12) is arranged between any two adjacent battery cell units (11).

9. The battery module (10) according to claim 6, wherein the bottom plate groove (221) is provided therein with a heat conductive adhesive layer (2212).

10. The battery module (10) according to claim 1, wherein an insulating cushion (4) is provided between the inside of the module case (3) and the battery cell (1).