CN216529149U

CN216529149U - Battery module and battery pack

Info

Publication number: CN216529149U
Application number: CN202121103775.3U
Authority: CN
Inventors: 李峥; 冯玉川; 高伟; 何泓材
Original assignee: Suzhou Qingtao New Energy S&T Co Ltd
Current assignee: Suzhou Qingtao New Energy S&T Co Ltd
Priority date: 2021-05-21
Filing date: 2021-05-21
Publication date: 2022-05-13
Anticipated expiration: 2031-05-21

Abstract

The utility model relates to the technical field of power batteries of electric automobiles, and particularly discloses a battery module and a battery pack. The battery module comprises a box body and a plurality of battery element assemblies, wherein the box body is provided with an accommodating cavity; a plurality of electric core subassemblies stack in along its thickness direction hold the intracavity, the thickness direction of electric core subassembly with the thickness direction of battery module is unanimous, the length direction of electric core subassembly with the length direction of battery module is unanimous. Because a plurality of electric core subassemblies are folded in holding the intracavity along its thickness direction, the thickness direction of electric core subassembly is unanimous with the thickness direction of battery module, the length direction of electric core subassembly is unanimous with the length direction of battery module, when because the battery module installation, its thickness direction is vertical direction, a plurality of electric core subassemblies stack along vertical direction promptly, consequently, the holding surface between the electric core subassembly is big, thereby when the battery module pressurized or receive the lateral part striking, can not take place the dislocation between the electric core subassembly, thereby the stability of battery module mechanical properties has been improved.

Description

Battery module and battery pack

Technical Field

The utility model relates to the technical field of power batteries of electric automobiles, in particular to a battery module and a battery pack.

Background

Lithium ion batteries are increasingly used in the field of electric vehicles as clean, efficient and pollution-free energy storage units; soft package lithium ion battery receives market and terminal customer's acceptance more and more because of its higher energy density, better security, because of the inherent characteristic of soft package battery, its in-process in groups need earlier constitute battery module with the battery, then further constitute the battery package. And the electric core of current battery module all sets up vertically, shows for the thickness direction of electric core is the width or the length direction of battery module, and this to laminate polymer battery, mechanical properties becomes biggest hidden danger and challenge.

SUMMERY OF THE UTILITY MODEL

One objective of the present invention is to provide a battery module, so as to ensure the stability of the mechanical properties of the battery module.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a battery module, comprising:

a case having an accommodating chamber;

a plurality of electric core subassemblies, stack in along its thickness direction hold the intracavity, electric core subassembly's thickness direction with battery module's thickness direction is unanimous, electric core subassembly's length direction with battery module's length direction is unanimous.

Preferably, the core assembly comprises a cell having a length L, and 1200mm > L >300 mm.

Preferably, the ratio of the length to the width of the battery cell is 2-10.

Preferably, the ratio of the length to the thickness of the battery core is 10-100.

Preferably, a plurality of the electric core assemblies stacked in the thickness direction form a group of battery packs, and at least two groups of the battery packs are arranged in the accommodating cavity along the length direction of the battery module.

Preferably, the case includes:

a base plate;

the outer frame, the lid is located the bottom plate upside is in order to form hold the chamber, the bottom plate with outer frame passes through the connecting piece and connects, in order for the pretightning force is applyed to the electric core subassembly.

Preferably, the box body comprises a left side plate and a right side plate which are oppositely arranged, and the left side plate and the right side plate both extend along the length direction and the thickness direction of the battery module;

the left side board with the right side board outside all is provided with the cooling bath, the cooling bath is followed the length direction of battery module runs through the left side board with the right side board.

Preferably, the positive electrode and the negative electrode of the cell assembly are located at the same end in the length direction of the cell assembly.

Preferably, the battery pack assembly is provided with the positive pole and the one end of negative pole is connected with the busbar structure, the busbar structure include with anodal utmost point ear of being connected of positive pole and with the negative pole utmost point ear of being connected of negative pole.

Another object of the present invention is to provide a battery pack to improve the stability of the mechanical properties and the energy density of the battery pack.

a battery pack comprises a plurality of battery modules, wherein the length direction of each battery module is consistent with the width direction of the battery pack, and the thickness direction of each battery module is consistent with the thickness direction of the battery pack.

The utility model has the beneficial effects that:

because a plurality of electric core subassemblies are folded in holding the intracavity along its thickness direction, the thickness direction of electric core subassembly is unanimous with the thickness direction of battery module, the length direction of electric core subassembly is unanimous with the length direction of battery module, when because the battery module installation, its thickness direction is vertical direction, a plurality of electric core subassemblies stack along vertical direction promptly, consequently, the holding surface between the electric core subassembly is big, thereby when the battery module pressurized or receive the lateral part striking, can not take place the dislocation between the electric core subassembly, thereby the stability of battery module mechanical properties has been improved.

Drawings

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

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

FIG. 3 is a schematic structural diagram of a sampling apparatus provided in an embodiment of the present invention;

fig. 4 is a schematic partial structural diagram of a battery pack according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a battery pack according to an embodiment of the present invention.

In the figure:

10. a battery module; 20. a support frame;

11. an outer frame; 111. a left side plate; 112. a right side plate; 113. a cooling tank; 114. a top plate;

12. a base plate;

2. a battery pack; 21. an electrical core assembly; 211. an electric core; 212. soaking cotton; 213. an epoxy board;

3. a bus structure; 31. a bus bar assembly; 32. an end cap assembly; 321. an insulating cover; 322. an end cap;

4. a sampling device.

Detailed Description

The technical scheme of the utility model is further explained by the specific implementation mode in combination with the attached drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.

In the present invention, the directional terms such as "upper", "lower", "left", "right", "inner" and "outer" are used for easy understanding without making a contrary explanation, and thus do not limit the scope of the present invention.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The embodiment provides a battery module 10, which is used in an electric vehicle to improve the stability of the mechanical properties of the battery module 10.

As shown in fig. 1 and 2, in the battery module 10 provided in the present embodiment, the battery module 10 is preferably substantially a rectangular parallelepiped structure, and includes a case having a housing cavity for housing the electric cell assembly 21, and a plurality of electric cell assemblies 21. A plurality of electric core subassemblies 21 stack in holding the intracavity along its thickness direction, and the thickness direction of electric core subassembly 21 is unanimous with the thickness direction of battery module 10, and the length direction of electric core subassembly 21 is unanimous with the length direction of battery module 10.

Because a plurality of electric core subassemblies 21 stack in holding the intracavity along its thickness direction, the thickness direction of electric core subassembly 21 is unanimous with battery module 10's thickness direction, the length direction of electric core subassembly 21 is unanimous with battery module 10's length direction, when owing to battery module 10 installs, its thickness direction is vertical direction, a plurality of electric core subassemblies 21 stack along vertical direction promptly, consequently, the holding surface between the electric core subassembly 21 is big, thereby when battery module 10 pressurized or received the lateral part striking, can not take place the dislocation between the electric core subassembly 21, thereby battery module 10 mechanical properties's stability has been improved.

Preferably, the cell assembly 21 includes a cell 211, the length of the cell 211 is L, and 1200mm > L >300mm, and further, 600mm > L >400mm, the ratio of the length to the width of the cell 211 is 2-10, and the ratio of the length to the width of the cell 211 is preferably 4-8. The ratio of the length to the thickness of the battery cell 211 is 10-100. The battery cells 211 with the size ratio can further ensure the stability among the battery cells 211.

Preferably, the battery core assembly 21 further includes a foam 212 and an epoxy plate 213, the battery core 211, the foam 212 and the epoxy plate 213 are sequentially connected through a heat-conducting double-sided adhesive tape, the foam 212 has a buffering effect, and the epoxy plate 213 has an insulating effect.

The box body comprises a bottom plate 12 and an outer frame 11, wherein the outer frame 11 covers the upper side of the bottom plate 12 to form an accommodating cavity, and the bottom plate 12 is connected with the outer frame 11 through a connecting piece to apply pre-tightening force to the electric core assembly 21. Because a plurality of batteries 211 stack along thickness, consequently the inflation direction of batteries 211 is in vertical direction, and outer frame 11 and bottom plate 12 pass through bolt or other connecting pieces and connect to exert the pretightning force for battery pack assembly 21, improve battery module 10 mechanical properties stability simultaneously. When the battery cell 211 swells, the foam 212 can also protect the battery cell 211 and avoid rigid contact between the battery cells 211.

The conventional battery module 10 has a low grouping efficiency (volume grouping efficiency, mass grouping efficiency), which results in a low energy density (volume energy density, mass energy density) of the battery system. The measures taken by the battery module 10 according to the present embodiment to increase the energy density will be described in detail below.

As shown in fig. 2, a plurality of cell modules 21 stacked in the thickness direction form one group of cell stacks 2, and two groups of cell stacks 2 are disposed in the receiving cavity in the length direction of the battery module 10. It should be noted that three or more groups of battery packs 2 may be disposed in the accommodating cavity along the length direction of the battery module 10. The at least two groups of battery packs 2 are arranged in the same accommodating cavity, so that the number of the box bodies is saved, the space occupied by the box bodies is reduced, and the energy density of the battery module 10 is improved. Meanwhile, the two groups of battery packs 2 are arranged along the length direction of the battery module 10, so that the stability of the mechanical property of the battery module 10 is not affected.

The positive electrode and the negative electrode of each battery cell 211 are located at the same end of the battery cells 211 in the length direction, preferably, between two adjacent battery cells 211, the positive electrode of the upper battery cell 211 is connected with the negative electrode of the lower battery cell 211, and the negative electrode of the lower battery cell 211 is connected with the negative electrode of the next adjacent battery cell 211, so as to connect the battery pack 2 in series.

As shown in fig. 1, the end of the battery cell 211 provided with the positive electrode and the negative electrode is connected with a bus bar structure 3, and the bus bar structure 3 includes a positive electrode tab connected with the positive electrode and a negative electrode tab connected with the negative electrode. Therefore, the space of the positive electrode and the negative electrode is reserved at one end of the battery core 211, and the space of the connecting bus bar structure 3 is reserved at one end, so that the grouping efficiency of the battery module 10 is greatly improved.

In addition, the process of the battery module 10 in the prior art is complicated, which results in low production efficiency, and the measures taken by the battery module 10 according to the present embodiment to improve the production efficiency will be described in detail below.

The battery module 10 provided by the present embodiment is composed of highly integrated modular components, which greatly improves the manufacturability and production efficiency of the product, and specifically, the bus bar structure 3 includes a bus bar assembly 31 and an end cover assembly 32 for supporting the bus bar assembly 31. The bus bar assembly 31 includes a bus bar support, a bus bar and a sampling FPC, the bus bar support is disposed outside the bus bar to support the bus bar, and the sampling FPC is used to collect information such as the current of the battery pack 2. The end cap assembly 32 includes an insulating cap 321 and an end cap 322, and the insulating cap 321 physically isolates the busbar assembly 31 from electrical leakage and short circuit. The bus bar bracket, the bus bar and the sampling FPC of the embodiment are integrated into a whole part; the insulating cover 321 and the end cover 322 are integrated into a whole component to form a highly integrated modular component, which greatly improves the manufacturability and production efficiency of the product.

Preferably, the both ends of box all are provided with busbar structure 3, and the box is for link up the structure along its length direction's both ends, and busbar structure 3 part protrusion is in the box setting to establish ties between two adjacent battery module 10 of convenience, improve the compactness of battery module 10 structure simultaneously.

The outer frame 11 of the case includes a left side plate 111 and a right side plate 112 disposed opposite to each other, and both the left side plate 111 and the right side plate 112 extend in the length direction and the thickness direction of the battery module 10; the cooling grooves 113 are formed on the outer sides of the left and

right side plates

111 and 112, and the cooling grooves 113 penetrate the left and

right side plates

111 and 112 in the longitudinal direction of the battery module 10.

The liquid cooling system is integrated on the shell as one part of the outer frame 11, the outer frame 11 has the function of fixing the electric core assembly 21 and the function of cooling the electric core assembly 21, a highly integrated modularized component is formed, and the manufacturability and the production efficiency of a product are greatly improved. In addition, the left side plate 111 and the right side plate 112 of the outer frame 11 replace liquid cooling plates, so that the space occupied by the cooling plates is saved, and the energy density of the battery module 10 is improved. Meanwhile, at least two groups of battery packs 2 in the accommodating cavity share one group of cooling grooves 113, so that the cooling grooves 113 do not need to be formed in each group of battery packs 2, and the manufacturability and the production efficiency of products are greatly improved.

Left side board 111 and right side board 112 set up the both sides face at group battery 2, have used the advantage that the coefficient of heat conductivity is high on the electric core 211 plane direction, pass on left side board 111 and right side board 112 fast with the heat that electric core 211 produced in the course of the work, have improved the cooling efficiency of electric core 211.

Preferably, the outer frame 11 further includes a top plate 114 connected to upper ends of the left and

right side plates

111 and 112, the top plate 114 being disposed opposite to the bottom plate 12 and protecting the cell assembly 21.

As shown in fig. 3, in order to collect information such as temperature between two adjacent electric core assemblies 21, a sampling device 4 is provided between two adjacent electric core assemblies 21 to collect information such as temperature.

As shown in fig. 4 and 5, the present embodiment further provides a battery pack, and the battery pack is used in an electric vehicle to provide power for the electric vehicle. The battery pack includes the plurality of battery modules 10 described above, and the plurality of battery modules 10 are preferably connected in series to improve the driving range of the electric vehicle.

The length direction of the battery modules 10 is consistent with the width direction of the battery pack, at least two rows of battery modules 10 are preferably arranged along the width direction of the battery pack, a plurality of groups of battery modules 10 are arranged along the length direction of the battery pack, and the thickness direction of the battery modules 10 is consistent with the thickness direction of the battery pack, so that the stability of the mechanical property of the battery pack is ensured. The battery pack comprises a plurality of battery modules 10, namely, the battery pack adopts a large module scheme, so that the energy density of the system is greatly improved.

As shown in fig. 5, the battery pack preferably further includes a mounting frame in which the plurality of battery modules 10 are disposed, and the battery pack is mounted to the vehicle frame through the mounting frame.

Preferably, the parameters of the battery module 10 and the battery pack designed by the scheme are as follows; the size of the battery cell 211 is as follows: 8.5 × 570 × 185 mm; battery module 10 size: 1198 x 193 x 109 mm; the size of the battery pack is as follows: 1955 x 1287 x 120 mm; each module comprises 24 cells 211. Cell pack accumulation group efficiency about 57%; the battery pack mass unitization efficiency is about 80%.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A battery module, comprising:

a case having an accommodating chamber;

a plurality of electricity core subassembly (21), stack in along its thickness direction hold the intracavity, the thickness direction of electricity core subassembly (21) with battery module's thickness direction is unanimous, the length direction of electricity core subassembly (21) with battery module's length direction is unanimous.

2. The battery module according to claim 1, characterized in that the cell assembly (21) comprises cells (211), the length of the cells (211) is L, and 1200mm > L >300 mm.

3. The battery module according to claim 2, characterized in that the ratio of the length to the width of the battery cell (211) is 2-10.

4. The battery module according to claim 2, characterized in that the ratio of the length to the thickness of the battery cell (211) is 10-100.

5. The battery module according to any one of claims 1 to 4, wherein a plurality of the cell assemblies (21) stacked in the thickness direction form a group of the cell stacks (2), and at least two groups of the cell stacks (2) are arranged in the receiving cavity in the length direction of the battery module.

6. The battery module according to claim 5, wherein the case comprises:

a base plate (12);

outer frame (11), lid are located bottom plate (12) upside is in order to form the chamber is held, bottom plate (12) with outer frame (11) pass through the connecting piece and connect, in order for give electric core subassembly (21) applys the pretightning force.

7. The battery module according to claim 5, wherein the case includes a left side plate (111) and a right side plate (112) that are disposed opposite to each other, the left side plate (111) and the right side plate (112) each extending in a length direction and a thickness direction of the battery module;

the outer sides of the left side plate (111) and the right side plate (112) are respectively provided with a cooling groove (113), and the cooling grooves (113) penetrate through the left side plate (111) and the right side plate (112) along the length direction of the battery module.

8. The battery module according to any one of claims 1 to 4, wherein the positive electrode and the negative electrode of the cell assembly (21) are located at the same end in the length direction of the cell assembly (21).

9. The battery module according to claim 8, wherein the core assembly (21) has a bus bar structure (3) connected to one end thereof provided with the positive electrode and the negative electrode, and the bus bar structure (3) includes a positive electrode tab connected to the positive electrode and a negative electrode tab connected to the negative electrode.

10. A battery pack comprising a plurality of battery modules according to any one of claims 1 to 9, wherein the length direction of the battery modules coincides with the width direction of the battery pack, and the thickness direction of the battery modules coincides with the thickness direction of the battery pack.