CN220341377U

CN220341377U - Battery module

Info

Publication number: CN220341377U
Application number: CN202320259961.9U
Authority: CN
Inventors: 蔡彪; 尤志毅; 岳兴; 庄明加; 王渭渭
Original assignee: Shenzhen Infypower Co ltd
Current assignee: Shenzhen Infypower Co ltd
Priority date: 2023-02-20
Filing date: 2023-02-20
Publication date: 2024-01-12
Anticipated expiration: 2033-02-20

Abstract

The utility model provides a battery module, comprising: the battery cell is fixed in the box body, a battery cell limiting structure is arranged at the front end and/or the rear end of the box body, the battery cell limiting structure is arranged opposite to each row of battery cells, and the isolation protection cover is fixed on the upper side of each battery cell. When the electric core heat spreading test is carried out, the electric core starts to expand continuously in the continuous heating process, the electric core around the electric core starts to be extruded, the electric core limiting structure ensures that the two ends of the electric core module are limited, the position limitation of the electric core in the deformation process can be ensured, the electric core is forced to generate heat spreading, and the smooth passing of the heat spreading test is ensured. In addition, an isolation protective cover is arranged on the upper side of the battery cells, when one battery cell in the battery module is out of control, high-temperature and high-pressure substances sprayed out of the battery cell explosion-proof valve cannot be sprayed onto the other battery cell on the opposite side of the battery cell, and safety of the battery module is improved.

Description

Battery module

Technical Field

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

Background

In order to ensure the safety of the battery module, a heat spreading test needs to be carried out on the battery module, in the heat spreading test, when the battery core is continuously heated, the battery core starts to continuously expand and starts to extrude surrounding battery cores, in the prior battery module, a certain expansion space is reserved for the battery core, so the battery core is not completely fixed, and as the two ends of the battery core are not limited, the battery core is not limited in position in the deformation process, so that the battery core cannot effectively generate heat spreading in the test process, the test cannot pass, and the cost is wasted.

In addition, when one cell is continuously heated, high-temperature and high-pressure substances in the cell shell are sprayed out by the pressure release valve of the cell, and then the high-temperature and high-pressure substances are sprayed onto the other cell on the opposite side of the cell, because the temperature is continuously increased, when the temperature reaches a certain degree, a fire phenomenon can occur, so that a thermal runaway test can be caused, and the cost and time are wasted.

Therefore, a new battery module design scheme is needed to solve the above technical problems.

Disclosure of Invention

The utility model aims to provide a battery module, which aims to solve the problems that the conventional battery module cannot smoothly form heat spreading when performing a heat spreading test, so that the test fails and the cost and time are wasted.

In order to solve the above technical problems, the present utility model is implemented as a battery module, comprising: the battery cell structure comprises a box body, battery cells and isolation protection covers, wherein at least one column of battery cells are fixed in the box body, a battery cell limiting structure is arranged at the front end and/or the rear end of the box body, the battery cell limiting structure is arranged opposite to each column of battery cells, and the isolation protection covers are fixed on the upper sides of the battery cells.

Further, the electric core limit structure comprises a front limit support and a rear limit support, the front limit support is fixedly arranged on the inner side of the front end of the box body, the rear limit support is fixedly arranged on the inner side of the rear end of the box body, and the electric core is arranged between the front limit support and the rear limit support side by side.

Further, heat insulation cotton longitudinally arranged is arranged in the box body and is arranged between the two electric cores. The heat insulation cotton can effectively prevent heat transfer of adjacent battery cells, and the safety of the battery module is improved.

Further, every second cell is provided with a heat insulation cotton.

Further, two rows of battery cells are arranged in the box body, two front limiting brackets are fixed on the inner side of the front end of the box body, two rear limiting brackets are fixed on the inner side of the rear end of the box body, and each row of battery cells is arranged between one front limiting bracket and one rear limiting bracket.

Further, a limiting plate is arranged on the front limiting support, one end of the limiting plate is fixedly connected with the front limiting support, and the other end of the limiting plate is obliquely arranged in a direction close to the battery cell. The limiting plate limits the battery core and has certain mechanical elasticity, so that the battery core has a certain expansion space, and the safety requirement of the battery core and the heat spreading test requirement are met.

The limiting plate is made by punching the middle part of the front limiting support, and the limiting plate and the front limiting support are of an integrated structure, have certain elasticity, can better provide position limitation for the battery cell, and are convenient to process and low in cost.

Further, the middle part of the front limiting support protrudes towards the direction close to the battery cell, and two sides of the front limiting support are fixedly connected with the front side plate of the box body through two fixed ear plates.

Further, the middle part of the back limiting support protrudes towards the direction close to the battery cell, and two sides of the back limiting support are fixedly connected with the back side plate of the box body through two fixed ear plates.

Further, an electrolyte spray hole is formed in the isolation protective cover, and the electrolyte spray hole is arranged opposite to the explosion-proof valve of the battery cell.

Further, the upper side of the box body is also provided with a wire harness isolation plate, and the wire harness isolation plate is arranged on the lower side of the isolation protective cover.

Further, a plurality of weeping holes are formed in the wire harness isolation plate.

Further, the two sides of the box body are also fixed with the battery cell fixing plates, and the battery cell fixing plates are used for fixing the battery cells.

The battery cell fixing plate is horizontally arranged, one side of the battery cell fixing plate is fixedly connected with a side plate which is vertically arranged, and the side plates are fixedly connected to two sides of the box body.

Compared with the prior art, the battery module has the beneficial effects that:

according to the utility model, the front end and the rear end of the box body are provided with the cell limiting structures, when a cell thermal spread test is carried out, the cell in the battery module begins to expand continuously in the continuous heating process, and begins to extrude surrounding cells, the cell limiting structures ensure that the two ends of the cell module are limited, so that the position of the cell in the deformation process can be ensured to be limited, the cell is forced to generate thermal spread, the smooth passing of the thermal spread test is ensured, the failure times of the battery module in the thermal runaway test process can be effectively reduced, the passing rate of the whole machine test is greatly improved, and the time cost and the test cost of the thermal runaway test of the battery module are reduced.

In addition, the battery module is provided with the isolation protective cover on the upper side of the battery cells, when one battery cell in the battery module is out of control, high-temperature and high-pressure substances sprayed from the battery cell explosion-proof valve cannot be sprayed onto the other battery cell on the opposite side of the battery cell, so that the probability of heat spreading of the battery module is reduced, the safety of the battery module is improved, and the generation of a fire source can be effectively slowed down or prevented under the condition that a battery fails, so that the whole battery module is free from firing from beginning to end in the thermal control test process.

Drawings

FIG. 1 is a schematic view of the overall structure of a front side view of a case according to an embodiment of the present utility model;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

FIG. 3 is a schematic view of the overall structure of the rear side view angle of the case according to the embodiment of the present utility model;

FIG. 4 is a partial enlarged view at B in FIG. 3;

fig. 5 is a schematic view showing the overall structure of a battery module according to an embodiment of the present utility model;

fig. 6 is a schematic view of a battery module mounting isolation cover according to an embodiment of the present utility model;

fig. 7 is a schematic view of a battery module mounting harness isolation board in an embodiment of the present utility model;

in the drawings, each reference numeral denotes:

1. the battery pack comprises a case body 2, a front limiting support 3, a rear limiting support 4, a limiting plate 5, a battery cell fixing plate 6, a side plate 7, a battery cell 8, an isolation protective cover 9, an electrolyte spraying hole 10, a wire harness isolating plate 11, a front fixing lug plate 12, a rear fixing lug plate 13, heat insulation cotton 14 and a liquid leakage hole.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below are exemplary and intended to illustrate the present utility model and should not be construed as limiting the utility model, and all other embodiments, based on the embodiments of the present utility model, which may be obtained by persons of ordinary skill in the art without inventive effort, are within the scope of the present utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", "radial", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplify the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Examples:

referring to fig. 1 to 4, in the present embodiment, a battery module includes: the battery cell 7 is fixed in the box 1, the front end inner side of the box 1 is fixedly provided with the front limiting support 2, the rear end inner side of the box 1 is fixedly provided with the rear limiting support 3, the battery cell 7 is arranged between the front limiting support 2 and the rear limiting support 3 side by side, when the battery cell 7 is appointed to be sent out in the continuous heating process, the battery cell 7 begins to lose efficacy, the volume of the battery cell 7 is expanded continuously, when a certain value is reached, the battery cell 7 touches the front limiting support 2 and the rear limiting support 3, the battery cell 7 is extruded continuously under the constraint force, electrolyte is sprayed out immediately, and therefore the smooth performance of a heat spreading test is ensured.

In this embodiment, two rows of battery cells 7 are disposed in the case 1, two front limiting brackets 2 are fixed on the inner side of the front end of the case 1, two rear limiting brackets 3 are fixed on the inner side of the rear end of the case 1, and each row of battery cells 7 is disposed between one front limiting bracket 2 and one rear limiting bracket 3.

The middle part of the front limiting bracket 2 protrudes towards the direction close to the battery cell 7, and two sides of the front limiting bracket 2 are fixedly connected with the front side plate of the box body 1 through two front fixing lug plates 11. The middle part of the front limiting support 2 is U-shaped, so that the front limiting support can be used as a limiting support structure of the battery cell 7, and meanwhile, the inner part of the front limiting support 2 can also be used as a mounting space of other parts. The middle part of the rear limit bracket 3 is also protruded towards the direction close to the battery cell 7, and two sides of the rear limit bracket 3 are fixedly connected with the rear side plate of the box body 1 through two rear fixing lug plates 12.

In this embodiment, a limiting plate 4 is disposed on the front limiting support 2, one end of the limiting plate 4 is fixedly connected with the front limiting support 2, and the other end is obliquely disposed in a direction approaching to the battery cell 7. The limiting plate 4 can provide further support on the basis of the front limiting support 2, so that the battery cell 7 can be guaranteed to be heated and then expanded to a certain extent, and meanwhile, the battery cell 7 is limited by the front limiting support 2 after the limiting plate 4 is pressed in place, so that the smooth performance of a heat spreading test is guaranteed. Limiting plate 4 in this embodiment is stamped by preceding limiting bracket 2 middle part and is made, limiting plate 4 and preceding limiting bracket 2 structure as an organic whole, has certain elasticity, can provide the position restriction to electric core 7 better, and processing cost is low moreover.

In this embodiment, the two sides of the case 1 are further fixed with a battery cell fixing plate 5, and the battery cell fixing plate 5 is used for fixing the battery cell 7. The battery cell fixed plate 5 is horizontally arranged, one side of the battery cell fixed plate 5 is fixedly connected with a side plate 6 which is vertically arranged, and the side plate 6 is fixedly connected with two sides of the box body 1.

Referring to fig. 5, in order to effectively prevent heat transfer of adjacent cells 7, a heat insulating cotton 13 is disposed in the case 1 in a longitudinal direction, and the heat insulating cotton 13 is disposed between the two cells 7. In this embodiment, the case 1 has eight cells 7 in a row, and one heat insulation cotton 13 is disposed every two cells 7 instead of disposing the heat insulation cotton 13 between each cell 7, so that the volume and cost of the battery module are reduced while ensuring safety.

While heat transfer between the battery cells 7 is blocked by the heat insulation cotton 13, a plurality of heat dissipation holes are further formed in the box body 1, and timely heat dissipation of the battery cells 7 is ensured through the heat dissipation holes.

Referring to fig. 6, the battery module further includes an isolation protection cover 8, the isolation protection cover 8 is fixed on the upper side of the battery cell 7, the isolation protection cover 8 is provided with an electrolyte spray hole 9, the electrolyte spray hole 9 is opposite to an explosion-proof valve of the battery cell 7, and thus electrolyte sprayed by the battery cell 7 can be effectively prevented from being burst to tabs of other battery cells 7, and short circuit and fire are avoided.

The battery module of this embodiment has set up the isolation protection cover 8 in electric core 7 upside to set up electrolyte orifice 9 on isolation protection cover 8, when the electric core 7 in this battery module takes place thermal runaway, from this electric core 7 explosion-proof valve spun high temperature high pressure material can not spray on this electric core 7 of electric core 7 opposite one side another electric core 7, and then reduced the probability that battery module takes place the heat and spread, improved the security of battery module, can be under the condition that the battery takes place to become invalid, the effectual production that slows down or stops the fire source lets whole battery module take place the phenomenon that fires throughout in thermal runaway test process.

Referring to fig. 7, in this embodiment, the upper side of the case 1 is further provided with a wire harness isolation board 10, the wire harness isolation board 10 is disposed at the lower side of the isolation protection cover 8, and a plurality of drain holes 14 are formed in the wire harness isolation board 10, so that the electrolyte discharged after the explosion-proof valve of the battery core 7 is opened is effectively split and isolated, the ignition and short circuit of the whole battery module are delayed, and the safety is further improved.

In this embodiment, the front limiting support 2 and the rear limiting support 3 are respectively disposed at the inner sides of two ends of the box body 1, a row of electric cores 7 are fixed between the front limiting support 2 and the rear limiting support 3, when a battery module thermal spread test is performed, the electric cores 7 in the battery module start to expand continuously in the continuous heating process, the electric cores 7 around the electric cores start to be extruded, the front limiting support 2 and the rear limiting support 3 ensure that two ends of the battery module are limited, the electric cores 7 can be ensured to be limited in position in the deformation process, the electric cores 7 generate thermal spread, and smooth passing of the thermal spread test is ensured. The failure times of the battery module in the thermal runaway test process can be effectively reduced, the passing rate of the whole machine test is greatly improved, and the time cost and the test cost of the thermal runaway test of the battery module are reduced.

In other embodiments, a stopper or other structure may be used as a cell limiting structure for limiting the position of the cell 7.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.

Claims

1. The battery module is characterized by comprising a box body, electric cores and isolation protection covers, wherein at least one row of the electric cores are fixed in the box body, electric core limiting structures are arranged at the front end and/or the rear end of the box body, the electric core limiting structures are arranged opposite to each row of the electric cores, and the isolation protection covers are fixed on the upper sides of the electric cores.

2. The battery module according to claim 1, wherein the cell limiting structure comprises a front limiting bracket and a rear limiting bracket, the front limiting bracket is fixedly arranged on the inner side of the front end of the box body, the rear limiting bracket is fixedly arranged on the inner side of the rear end of the box body, and the cells are arranged between the front limiting bracket and the rear limiting bracket side by side.

3. The battery module according to claim 1 or 2, wherein a heat insulating cotton is provided in the case body, the heat insulating cotton being provided between two cells.

4. A battery module according to claim 3, wherein one heat insulating cotton is provided every two cells.

5. The battery module according to claim 2, wherein two rows of the battery cells are arranged in the case, two front limit brackets are fixed on the inner side of the front end of the case, two rear limit brackets are fixed on the inner side of the rear end of the case, and each row of the battery cells is arranged between one front limit bracket and one rear limit bracket.

6. The battery module according to claim 2 or 5, wherein the middle part of the front limit bracket protrudes in a direction approaching the battery cell, and both sides of the front limit bracket are fixedly connected with the front side plate of the case body through two fixing ear plates.

7. The battery module according to claim 2 or 5, wherein the middle part of the rear limit bracket protrudes in a direction approaching the battery cell, and both sides of the rear limit bracket are fixedly connected with the rear side plate of the case body through two fixing ear plates.

8. The battery module according to claim 1, wherein the isolation protective cover is provided with an electrolyte spray hole, and the electrolyte spray hole is arranged opposite to the explosion-proof valve of the battery cell.

9. The battery module according to claim 1, wherein the upper side of the case is further provided with a harness isolation plate provided at the lower side of the isolation protection cover.

10. The battery module of claim 9, wherein the harness isolation plate is provided with a plurality of drain holes.