CN221102288U

CN221102288U - Battery module and battery pack

Info

Publication number: CN221102288U
Application number: CN202322761784.7U
Authority: CN
Inventors: 张旭; 付方凯; 何亚飞
Original assignee: Envision Power Technology Jiangsu Co Ltd; Envision Ruitai Power Technology Shanghai Co Ltd
Current assignee: Envision Power Technology Jiangsu Co Ltd; Envision Ruitai Power Technology Shanghai Co Ltd
Priority date: 2023-10-13
Filing date: 2023-10-13
Publication date: 2024-06-07
Anticipated expiration: 2033-10-13

Abstract

The utility model belongs to the technical field of power batteries, and relates to a battery module and a battery pack. The battery module comprises a battery cell stacking body and an insulating bracket, wherein the battery cell stacking body comprises a plurality of battery cells, the end part of each battery cell is provided with an air bag, the battery cell is provided with a tab, and one part of the tab extends out of the air bag; the insulating support is arranged at the end part of the battery cell stacking body, one side of the insulating support facing the battery cell stacking body is provided with a reinforcing part and an avoidance hole corresponding to the tab, and the avoidance hole penetrates through the side wall of the insulating support and is positioned between two adjacent reinforcing parts; the tab is adapted to pass through the area between two adjacent reinforcing portions and extend into the avoidance hole, and the portion of the air bag covering the tab is adapted to be located between the two adjacent reinforcing portions and can be covered by the orthographic projection of the reinforcing portion on the tab. The beneficial effects include: the structural strength of the insulating support is guaranteed through the reinforcing part, local stress generated by local interference of the air bag and the reinforcing part is avoided, and the safety performance of the battery module and the battery pack is improved.

Description

Battery module and battery pack

Technical Field

The utility model belongs to the technical field of power batteries, and particularly relates to a battery module and a battery pack.

Background

In the soft package battery module, a sampling component is usually arranged for realizing high-voltage output and low-voltage sampling, so as to ensure the realization of the charge and discharge functions of the battery cell and the output and transmission of the voltage and current signals of the battery cell. The sampling component needs to be provided with mounting support through an insulating support, the insulating support is generally located between the soft package battery core and the sampling component, gas can be generated inside the soft package battery core in the recycling process, when the soft package battery core is recycled to an EOL (End of Life or End ofLine, EOL for short) state, gas accumulated inside the soft package battery core enables an air bag at the capping position to expand, and the air bag is easy to interfere with the insulating support to generate local stress, so that battery core leakage is caused, and potential safety hazards exist.

Disclosure of utility model

In view of the above-mentioned drawbacks of the prior art, an object of the present utility model is to provide a battery module and a battery pack, which are used for solving the problem of leakage of the battery cells due to local stress in the prior art, so as to improve the safety performance of the battery module and the battery pack.

To achieve the above and other related objects, the present utility model provides a battery module comprising:

The battery cell stacking body comprises a plurality of battery cells, wherein the end part of each battery cell is provided with an air bag, each battery cell is provided with a tab, and one part of each tab extends out of the air bag; and

The insulation support is arranged at the end part of the battery cell stacking body, one side of the insulation support facing the battery cell stacking body is provided with a reinforcing part and an avoidance hole corresponding to the tab, and the avoidance hole penetrates through the side wall of the insulation support and is positioned between two adjacent reinforcing parts;

The electrode lug is suitable for penetrating through the area between two adjacent reinforcing parts and extending into the avoiding hole, and the part of the air bag covering the electrode lug is suitable for being positioned between the two adjacent reinforcing parts and can be covered by the orthographic projection of the reinforcing parts on the electrode lug.

Optionally, the portion of the air bag covering the tab includes a top sealing portion of the battery cell, and the height of the reinforcing portion is not less than the height of the top sealing portion.

Optionally, the reinforcement portion has an arcuate surface, the arcuate surface facing the air pocket.

Optionally, the battery cell stacking device further comprises a shell, the battery cell stacking body and the insulating support are installed in the shell, a first limiting structure is arranged on the shell, and a second limiting structure which is suitable for being in limiting fit with the first limiting structure is arranged on the insulating support.

Optionally, the casing includes the bounding wall, insulating support is located the bounding wall with between the electric core stack, first limit structure is including setting up draw-in groove on the bounding wall, second limit structure is including setting up fixture block on the insulating support, the fixture block is suitable for the slip in the draw-in groove and with draw-in groove joint cooperation is spacing.

Optionally, the bounding wall includes curb plate and end plate, the curb plate with the end plate distributes in turn and links to each other and encloses into square frame, insulating support is located the end plate with between the electric core stacks, the draw-in groove sets up on the curb plate, the fixture block setting is in insulating support's orientation on the end wall of curb plate, and with the draw-in groove corresponds.

Optionally, the clamping groove penetrates through the side wall of the side plate along the thickness direction of the side plate, the clamping groove is in a U-shaped structure, an opening of the clamping groove faces the end plate, extends along the length direction of the side plate and penetrates through the end wall of the side plate, and a blocking part is arranged at the opening of the clamping groove; the clamping block is of a U-shaped structure, an opening of the clamping block faces the end plate, and an elastic clamping portion which corresponds to the blocking portion and is clamped and limited is arranged at the opening of the clamping block.

Optionally, the casing still includes roof and bottom plate, first limit structure is including setting up the roof with spacing hole on the bottom plate, second limit structure is including setting up the spacing post of top and bottom of insulating support, spacing post be suitable for with spacing hole cooperation is spacing.

Optionally, the bottom plate is the liquid cooling board, the liquid cooling board is including upper plate and the lower plate that stacks up, the edge of lower plate stretch out in the edge of upper plate and form and dodge the district, spacing hole sets up down the plywood dodge on the district.

Optionally, a guide part is arranged on an end wall of the insulating bracket, which faces the side plate, and one end of the guide part, which is far away from the end plate, is provided with a guide inclined surface which faces the side plate.

To achieve the above and other related objects, the present application also provides a battery pack including the battery module as described above.

As described above, the battery module and the battery pack of the utility model have at least the following beneficial effects: the reinforcing part is arranged on the insulating support, so that the structural strength of the insulating support is ensured, the orthographic projection of the reinforcing part on the lug can completely cover the part of the air bag, which covers the lug, and the part of the air bag, which covers the lug, is prevented from generating local stress due to the interference of local part and the reinforcing part when the air bag expands, thereby being beneficial to reducing the leakage risk and improving the safety performance of the battery module and the battery pack.

Drawings

Fig. 1 is a schematic view illustrating a structure of a battery module according to an embodiment of the present utility model;

fig. 2 is a schematic view of the battery module of fig. 1 with the end plates and top plate removed;

FIG. 3 is an enlarged schematic view of portion A of FIG. 2;

fig. 4 is a partial exploded view of the battery module of fig. 2;

FIG. 5 is an enlarged schematic view of portion B of FIG. 4;

FIG. 6 is an enlarged schematic view of portion C of FIG. 4;

FIG. 7 is a schematic view of a part of the insulating support of FIG. 4;

FIG. 8 is a partial cross-sectional view of FIG. 2;

Fig. 9 is a bottom view of the battery module of fig. 1.

Description of the part reference numerals

The side plate 1, the clamping groove 11, the blocking part 111, the bottom plate 2, the cell stack 3, the electrode lug 31, the air bag 32, the insulating support 4, the clamping block 41, the elastic clamping part 411, the limit column 42, the guide part 43, the guide inclined plane 431, the reinforcing part 44, the arc-shaped surface 441, the avoidance hole 45, the top plate 5, the exhaust hole 51, the sampling module 6, the end plate 7 and the limit hole 8.

Detailed Description

Further advantages and effects of the present utility model will become apparent to those skilled in the art from the disclosure of the present utility model, which is described by the following specific examples.

It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the utility model to the extent that it can be practiced, since modifications, changes in the proportions, or otherwise, used in the practice of the utility model, are not intended to be critical to the essential characteristics of the utility model, but are intended to fall within the spirit and scope of the utility model. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the utility model, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the utility model may be practiced.

Referring to fig. 1 and 9, in some alternative embodiments, the present application provides a battery pack including a battery module.

Referring to fig. 1, 2, 4, 7 and 8, in some alternative embodiments, the battery module includes a cell stack 3 and an insulating support 4; the battery module may include a housing and/or sampling assembly 6 in addition to the above-described components. The cell stack 3 comprises a plurality of cells, each cell is provided with an air bag 32 at the end, each cell is provided with a tab 31, a part of the tab 31 extends out of the air bag 32, that is, the air bag 32 is a part of an aluminum plastic film for packaging the bare cell, a part of the tab 31 extends out of the aluminum plastic film from the air bag 32, and the other part of the tab 31 is packaged in the aluminum plastic film; the insulating support 4 is arranged at the end part of the battery cell stacking body 3, a reinforcing part 44 and an avoidance hole 45 corresponding to the electrode lug 31 are arranged on one side, facing the battery cell stacking body 3, of the insulating support 4, the avoidance hole 45 penetrates through the side wall of the insulating support 4 and is positioned between two adjacent reinforcing parts 44, the avoidance hole 45 can provide an avoidance space for the electrode lug 31 so that the electrode lug 31 is connected with the sampling assembly 6, the reinforcing part 44 ensures the structural strength of the insulating support 4, and deformation of the insulating support 4 during welding is avoided; the tab 31 is adapted to pass through the area between two adjacent reinforcing portions 44 and extend into the avoiding hole 45, and the portion of the air bag 32 covering the tab 31 is adapted to be located between two adjacent reinforcing portions 44 and can be covered by the orthographic projection of the reinforcing portion 44 on the tab 31, or at least part of each reinforcing portion 44 overlaps with the portion of the air bag 32 covering the tab 31, so as to avoid local stress caused by interference between the portion of the air bag 32 covering the tab 31 and the reinforcing portion 44 during inflation.

Optionally, at least a portion of the insulating support 4 is located between the cell stack 3 and the sampling assembly 6 and insulates the portion of the sampling assembly 6 from the cell stack 3, that is, the cell stack 3 and the sampling assembly 6 are located on opposite sides of the insulating support 4. The number of the avoidance holes 45 and the reinforcing portions 44 may be plural, the plural electric cores are stacked along the thickness direction of the electric core, the tabs 31 of two adjacent electric cores may be bent and folded in opposite directions to be connected electrically so as to realize series connection or parallel connection of the electric cores, and the tabs 31 of two adjacent electric cores may be bent and folded together to pass through the same avoidance hole 45 and be connected with the sampling assembly 6, so that the sampling assembly 6 performs information acquisition. Further, the insulating holder 4 may be made of plastic or other insulating material, and the sampling assembly 6 is mounted on the insulating holder 4, and is supported by the insulating holder 4.

Optionally, the portion of the air bag 32 covering the tab 31 includes a top sealing portion of the battery cell, and the height of the reinforcing portion 44 is not less than the height of the top sealing portion; wherein the height of the reinforcing part 44 is H1, the height of the top sealing part is H2, and H2 is less than or equal to H1. In the present application, the height direction of the insulating support 4, the height direction of the reinforcing portion 44, the height direction of the top sealing portion, and the height direction of the cell stack 3 are the same, i.e., the Z direction in the drawing; the length direction of the insulating support 4, the arrangement direction of the plurality of reinforcing parts 44, the arrangement direction of the plurality of avoiding holes 45, the thickness direction of the reinforcing parts 44 and the thickness direction of the cell stack 3 are the same, namely, the X direction in the drawing; the thickness direction of the insulating holder 4, the width direction of the reinforcement 44, and the length direction of the cell stack 3 are the same, i.e., the Y direction in the drawing. Further, it is understood that the gas is not accumulated in the gas bag 32 when the battery cell is in the initial state, and the gas is accumulated in the battery cell to expand the gas bag 32 when the battery cell is used for a certain life or thermal runaway occurs.

Optionally, the reinforcing portion 44 has an arc surface 441, the arc surface 441 faces the air bag 32, and the reinforcing portion 44 has a smooth structure, so as to avoid damage to the air bag 32 when contacting the air bag 32.

In the battery module of the above embodiment, the projection of each reinforcing portion 44 in the thickness direction of the tab 31 can completely cover the portion of the air bag 32 covering the tab 31, so that the local stress generated by local contact between the portion of the air bag 32 corresponding to the tab 31 and the reinforcing portion 44 can be avoided, the risk of breakage of the air bag 32 is reduced, the risk of leakage of the battery cell stack 3 is reduced, and the service life and safety performance of the battery module are further improved.

Referring to fig. 1 to 6, in some alternative embodiments, the cell stack 3 and the insulating support 4 are mounted in a housing, a first limit structure is provided on the housing, and a second limit structure adapted to be in limit fit with the first limit structure is provided on the insulating support 4.

Optionally, the casing includes the bounding wall, and insulating support 4 is located between bounding wall and the electric core stack 3, and first limit structure is including setting up draw-in groove 11 on the bounding wall, and second limit structure is including setting up the fixture block on insulating support 4, and the fixture block is suitable for the slip draw-in groove and cooperates spacingly with the draw-in groove joint. Further, the bounding wall includes curb plate 1 and end plate 7, and curb plate 1 and end plate 7 alternate distribution link to each other and enclose into square frame, and insulating support 4 is located between end plate 7 and the electric core stack 3, and draw-in groove 11 sets up on curb plate 1, and fixture block 41 sets up on the end wall of insulating support 4 towards curb plate 1 to correspond with draw-in groove 11. Specifically, the clamping groove penetrates through the side wall of the side plate 1 along the thickness direction of the side plate 1, the clamping groove is of a U-shaped structure, an opening of the clamping groove faces the end plate 7 and extends along the length direction of the side plate 1 and penetrates through the end wall of the side plate 1, and a blocking part 111 is arranged at the opening of the clamping groove; the fixture block is U type structure, and the opening of fixture block is towards end plate 7, and the opening part of fixture block has and is suitable for and block portion 111 corresponds and the spacing elasticity joint portion 411 of joint, and the fixture block can remove the slip draw-in groove along the length direction of curb plate 1, and after the fixture block got into the draw-in groove, elasticity joint portion 411 resumes elastic deformation and blocks portion 111 butt for insulating support 4 obtains spacingly in the direction of height and the length of curb plate 1, realizes insulating support 4 spacing in Z orientation and Y orientation promptly. The first limit structure 11 and the second limit structure 41 are simple in structure, convenient to assemble and connect and limit, and capable of improving reliability and stability of the whole structure of the battery module and improving grouping efficiency of the battery module.

Optionally, the casing further comprises a top plate 5 and a bottom plate 2, the top plate 5 and the bottom plate 2 can be respectively connected with the top and the bottom of the coaming, the top plate 5 and the bottom plate 2 can be welded and fixed with the coaming, and the top plate 5, the bottom plate 2 and the coaming cooperate to encapsulate the components such as the cell stack 3, the sampling assembly 6, the insulating bracket 4 and the like in the casing; the first limit structure further comprises limit holes 8 arranged on the top plate 5 and the bottom plate 2, the second limit structure further comprises limit columns 42 arranged on the top end and the bottom end of the insulating support 4, the limit columns 42 correspond to the limit holes 8, the limit columns 42 are suitable for being filled in the corresponding limit holes 8 and are matched with the limit holes 8 to limit, the top plate 5 and the bottom plate 2 can be quickly assembled in place, the insulating support 4 can be further limited to move in the X direction, the Y direction and the Z direction, the insulating support 4 is installed and positioned more firmly and accurately, and accordingly the sampling reliability of the sampling assembly 6 is improved.

Further, the bottom plate 2 is a liquid cooling plate, the liquid cooling plate comprises an upper plate and a lower plate which are stacked, the edge of the lower plate extends out of the edge of the upper plate and forms an avoidance area, the limiting hole 8 is arranged on the avoidance area of the lower plate, the lower plate is provided with a cooling groove body, and the upper plate covers the cooling groove body to form a sealed cooling flow channel and is welded and/or riveted with the lower plate; the bottom plate 2 adopts the structural design, so that the bottom plate 2 has a cooling function, can directly cool and exchange heat to the battery cell stacking body 3, does not need to set an additional liquid cooling plate, simplifies the structure and the process, and reduces the cost. Further, the top plate 5 is provided with an exhaust hole 51, and when thermal runaway occurs in the battery module, a large amount of smoke is generated, and the smoke can be exhausted from the exhaust hole 51 in a directional manner.

The battery module of the embodiment, the insulating support 4 can be assembled with the shell rapidly and accurately, so that the stability and the accuracy of the installation of the insulating support 4 are improved, the sampling reliability of the sampling assembly 6 is improved, positioning references can be provided for the bottom plate 2 and the top plate 5 after the insulating support 4 and the side plate 1 are positioned and assembled, the assembly efficiency and the assembly accuracy of the components such as the side plate 1, the bottom plate 2 and the top plate 5 are improved, and the grouping efficiency of the battery module is improved.

Referring to fig. 4 and 5, in some alternative embodiments, the end wall of the insulating support 4 facing the side plate 1 is provided with a guide portion 43, and the end of the guide portion 43 remote from the end plate 7 is provided with a guide inclined surface 431 facing the side plate 1.

Alternatively, the maximum distance between the side wall of the guide 43 facing the side plate 1 and the side plate 1 is between 0.3mm and 0.5 mm. The space between the guide part 43 and the side plates 1 is reasonably arranged, so that the insulation support 4 can be smoothly arranged between the two side plates 1, and the situation that the insulation support 4 and the side plates 1 are too large in X-direction clearance and too large in X-direction movement amplitude can be avoided, and the guide part 43 has a certain limiting effect on the insulation support 4 in X-direction can be avoided. Further, the maximum pitch may be any one of values of 0.3mm, 0.35mm, 0.4mm, or 0.5 mm.

Alternatively, the number of the guide portions 43 provided on the end of the insulating holder 4 facing the side plate 1 may be one, two or more, and when the number of the guide portions 43 is two or more, the plurality of guide portions 43 are spaced apart in the height direction of the insulating holder 4.

The battery module of the above embodiment can realize the guiding of the insulating bracket 4 in the assembly process by arranging the guiding part 43, so that the insulating bracket 4 is conveniently installed between the two side plates 1, and particularly when the gap between the insulating bracket 4 and the side plates 1 is smaller, the guiding is facilitated by the guiding inclined plane 431, so that the assembly difficulty is reduced.

Referring to fig. 1, 4 and 9, in some alternative embodiments, the assembly process of the battery module is: after the cell stack body 3 is manufactured, the side plate 1, the end plate 7, the insulating support 4 and the sampling assembly 6 are assembled in place, the end plate 7 is fixedly connected with the side plate 1, glue is coated on the top plate 5 and the bottom plate 2, and after the top plate 5 and the bottom plate 2 are assembled in place with the insulating support 4 respectively, the top plate 5 and the bottom plate 2 can be respectively bonded with the cell stack body 3. Specifically, the insulating holder 4 is first assembled with the two oppositely disposed side plates 1 in place, and then the end plates 7, the top plate 5, and the bottom plate 2 are assembled in place.

According to the battery module and the battery pack, the reinforcing part 44 is arranged on the insulating support 4, so that the structural strength of the insulating support 4 can be improved, interference between the part of the air bag 32 corresponding to the tab 31 and other parts of the insulating support 4 when the air bag is inflated can be avoided, local stress caused by local contact between the part of the air bag 32 corresponding to the tab 31 and the reinforcing part 44 is avoided, the leakage risk of the battery cell stack 3 is reduced, and the safety performance of the battery module and the battery pack is improved.

In the description of the present specification, the descriptions of the terms "present embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above embodiments are merely illustrative of the principles of the present utility model and its effectiveness, and are not intended to limit the utility model. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the utility model. Accordingly, it is intended that all equivalent modifications and variations of the utility model be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims

1. A battery module, comprising:

2. The battery module according to claim 1, wherein: the part of the air bag covering the electrode lug comprises a top sealing part of the battery cell, and the height of the reinforcing part is not smaller than that of the top sealing part.

3. The battery module according to claim 1, wherein: the reinforcement has an arcuate face facing the air pocket.

4. The battery module according to claim 1, wherein: the battery cell stacking device comprises a battery cell stacking body, an insulating support and a first limiting structure, and is characterized by further comprising a shell, wherein the battery cell stacking body and the insulating support are installed in the shell, the shell is provided with the first limiting structure, and the insulating support is provided with the second limiting structure which is suitable for being in limiting fit with the first limiting structure.

5. The battery module according to claim 4, wherein: the shell comprises a coaming, the insulating support is located between the coaming and the battery cell stacking body, the first limiting structure comprises a clamping groove arranged on the coaming, the second limiting structure comprises a clamping block arranged on the insulating support, and the clamping block is suitable for sliding into the clamping groove and is matched with the clamping groove in a limiting mode.

6. The battery module according to claim 5, wherein: the bounding wall includes curb plate and end plate, the curb plate with the end plate distributes in turn and links to each other and encloses into square frame, insulating support is located the end plate with between the electric core stacks, the draw-in groove sets up on the curb plate, the fixture block setting is in insulating support's orientation on the end wall of curb plate, and with the draw-in groove corresponds.

7. The battery module according to claim 6, wherein: the clamping groove penetrates through the side wall of the side plate along the thickness direction of the side plate, the clamping groove is of a U-shaped structure, an opening of the clamping groove faces the end plate and extends along the length direction of the side plate and penetrates through the end wall of the side plate, and a blocking part is arranged at the opening of the clamping groove; the clamping block is of a U-shaped structure, an opening of the clamping block faces the end plate, and an elastic clamping portion which corresponds to the blocking portion and is clamped and limited is arranged at the opening of the clamping block.

8. The battery module according to any one of claims 4 to 7, wherein: the shell further comprises a top plate and a bottom plate, the first limiting structure comprises limiting holes arranged on the top plate and the bottom plate, the second limiting structure comprises limiting columns arranged at the top end and the bottom end of the insulating support, and the limiting columns are suitable for being matched with the limiting holes to limit.

9. The battery module according to claim 8, wherein: the bottom plate is the liquid cooling board, the liquid cooling board is including upper plate and the lower plate that the stack was established, the edge of lower plate stretch out in the edge of upper plate and form and dodge the district, spacing hole sets up down the lower plate dodge on the district.

10. The battery module according to claim 6, wherein: the end wall of the insulating support, which faces the side plate, is provided with a guide part, and one end of the guide part, which is far away from the end plate, is provided with a guide inclined surface which faces the side plate.

11. A battery pack, characterized in that: a battery module comprising the battery module according to any one of claims 1 to 10.