CN220290957U

CN220290957U - Battery cell, battery module and battery pack

Info

Publication number: CN220290957U
Application number: CN202321764210.9U
Authority: CN
Inventors: 李勇
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2023-07-05
Filing date: 2023-07-05
Publication date: 2024-01-02
Anticipated expiration: 2033-07-05

Abstract

The utility model relates to the technical field of batteries, and discloses a battery cell, a battery module and a battery pack. The battery cell comprises a shell, a core package, a baffle plate and an elastic connecting assembly, wherein the core package is arranged in the shell; the baffle is arranged in the shell, a gap is formed between one side of the baffle and the large inner side surface of the shell, and the other side of the baffle is abutted against the front surface of the core bag; the elastic connecting component is elastically connected between the baffle plate and the large inner side surface of the shell so that the baffle plate can adaptively move relative to the shell according to the expansion condition of the core bag. When the battery cell is in a normal state, the baffle is used for limiting the movement of the core pack, plays a role in fixing and supporting, avoids random shaking of the core pack in the shell, and improves the safety performance and service life of the battery cell. When the core package expands, the core package promotes the baffle adaptability and removes to release certain space, reduce the extrusion force that the core package receives, and no matter how the inflation condition, the baffle can both play the supporting role to the core package, promotes the life of electric core to the maximize.

Description

Battery cell, battery module and battery pack

Technical Field

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

Background

In cell design, the concept of group margin is generally adopted to characterize the space filling degree of the cells. Group margin refers to the ratio of the cross-sectional area of the core pack to the internal cross-sectional area of the outer shell. When the electric core is designed, the energy efficiency of the electric core is required to be improved, the group margin of the electric core is often improved, namely, the inner core bag is basically attached to the shell of the electric core, on one hand, the energy efficiency of the electric core is maximum, and on the other hand, the core bag is prevented from shaking in the shell, so that potential safety hazards are eliminated. However, during the use process of the battery cell, the battery cell expands to different degrees along with the continuous charge and discharge, so that the thickness dimension of the battery cell changes. For the battery cells with high group margin, the battery cells expand, so that the outer shell is extruded, and the extrusion force acts on the battery cell package reversely, so that the service life of the battery cells is influenced.

Therefore, in order to solve the above problem, during actual production, a certain gap is reserved between the core pack and the shell, so that a certain expansion space is reserved for the core pack, the service life of the battery cell is prolonged, and potential safety hazards are avoided. However, because there is the clearance between core package and the shell, in the transportation, the core package can constantly rock and collide in the shell for the utmost point ear is pulled and takes place fatigue fracture, leads to the electric core inefficacy, and the utmost point ear still can lead to the pole piece to shift at the in-process of pulling, causes the short circuit risk.

Therefore, it is desirable to provide a battery cell, a battery module and a battery pack to solve the above problems.

Disclosure of Invention

The first object of the present utility model is to provide a battery cell, in which the baffle plate can adaptively move along with the expansion of the core pack while restricting the movement of the core pack, so as to reduce the stress of the core pack and maximally improve the service life of the battery cell.

In order to achieve the purpose, the utility model is realized by the following technical scheme:

a battery cell, comprising:

a housing and a core pack, the core pack being disposed within the housing;

the baffle is arranged in the shell, a gap is formed between one side of the baffle and the large inner side surface of the shell, and the other side of the baffle is abutted against the front surface of the core bag;

and the elastic connecting assembly is elastically connected between the baffle plate and the large inner side surface of the shell so that the baffle plate can adaptively move relative to the shell according to the expansion condition of the core bag.

As an alternative, the elastic connection assembly includes:

one end of the connecting rod is connected to the large inner side surface of the shell, the other end of the connecting rod penetrates through the baffle, and the baffle can slide relative to the connecting rod;

the elastic piece is sleeved on the connecting rod and located between the shell and the baffle, one end of the elastic piece is abutted to the large inner side surface of the shell, and the other end of the elastic piece is abutted to the side surface of the baffle.

As an alternative scheme, the electric core includes two baffles, two baffles are followed the width direction interval and parallel arrangement of shell, the shell has two the inboard big face, every the baffle with correspond all overlap on the connecting rod between the inboard big face be equipped with the elastic component, the core package is located two between the baffles, just two openly of core package respectively with the baffle looks butt of corresponding one side.

As an alternative, the connecting rod is simultaneously threaded through two baffles, and two ends of the connecting rod are respectively fixed on the two inner large surfaces of the shell.

As an alternative scheme, the baffle is square structure, the quantity of connecting rod sets up to four, four the connecting rod set up respectively in four corners of baffle, every the both ends of connecting rod all overlap and are equipped with the elastic component.

As an alternative, a pressure sensor is provided on the side of the baffle facing away from the core pack or on the inner large surface of the housing, said pressure sensor being used to detect the pressure exerted by the baffle on the core pack.

As an alternative, a gap is formed between two ends of the baffle along the length direction and the inner side surface of the shell, a gap is formed between the bottom end of the baffle and the bottom surface of the shell, and the top end of the baffle is lower than the upper end surface of the shell.

As an alternative, the battery cell further includes a top cover structure, and the top cover structure is buckled at the open end of the housing.

The second objective of the present utility model is to provide a battery module, which can maximize the service life of the battery module by providing the above-mentioned battery cells.

a battery module comprising any one of the above-described cells.

A third object of the present utility model is to provide a battery pack, which can maximize the service life of the battery pack by providing the battery module.

a battery pack comprises the battery module.

The beneficial effects of the utility model are as follows:

according to the battery cell provided by the utility model, the baffle is abutted against the front surface of the core pack, and when the battery cell is in a normal state, the baffle is used for limiting the movement of the core pack, so that the battery cell plays a role in fixing and supporting, the core pack is prevented from shaking randomly in the shell, the safety performance of the battery cell is improved, and the service life of the battery cell is prolonged. When the core bag expands, the thickness of the core bag increases, and the core bag pushes the baffle to adaptively move, so that a certain space is released, and the extrusion force born by the core bag is reduced. Under the elastic connection effect of the elastic connection assembly, the baffle can adaptively move according to the expansion condition of the core package so as to meet the dimensional change of the core package after expansion, reduce the stress of the core package, and play a supporting role on the core package regardless of the expansion condition, so that the service life of the battery cell is maximally prolonged.

According to the battery module provided by the utility model, the service life of the battery module can be prolonged to the greatest extent by arranging the battery core.

According to the battery pack provided by the utility model, the service life of the battery pack can be prolonged to the greatest extent by arranging the battery module.

Drawings

For a more obvious and understandable description of embodiments of the utility model or solutions according to the prior art, reference will be made to the accompanying drawings, which are used in the description of the embodiments or the prior art and which are examples of the utility model, and from which other drawings can be obtained without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of the structure of the interior of a housing provided by an embodiment of the present utility model;

FIG. 2 is a schematic view of the structure of the shell with part of the structure hidden inside;

fig. 3 is a transverse cross-sectional view of a cell provided by an embodiment of the present utility model;

fig. 4 is a longitudinal cross-sectional view of a battery cell provided by an embodiment of the present utility model.

In the figure:

1. a housing; 11. a large inner surface; 12. an inner side surface; 13. a bottom surface; 14. an upper end surface; 15. a receiving chamber;

2. a baffle;

3. an elastic connection assembly; 31. a connecting rod; 32. an elastic member.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are orientation or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

As shown in fig. 1, this embodiment provides a battery cell, which is a square battery cell and includes a housing 1, a core pack and a top cover structure, wherein an accommodating cavity 15 with an opening is formed in the housing 1, the core pack is disposed in the accommodating cavity 15 of the housing 1, and electrolyte is injected into the accommodating cavity 15, and the top cover structure is buckled at the opening end of the housing to seal the opening of the housing 1. Wherein the housing 1 is used for carrying the core pack and providing effective restraint and protection for the core pack. The housing may be made of a conductive metal material, such as aluminum, aluminum alloy, etc., and the top cover structure may be in sealing connection with the housing 1 by welding, and the top cover structure is in the prior art, and the specific structure thereof will not be described herein. Specifically, be provided with anodal utmost point ear and negative pole utmost point ear on the core package, be provided with anodal utmost point post and negative pole utmost point post on the top cap structure, anodal utmost point ear is connected with anodal utmost point post electricity, and negative pole utmost point ear is connected with negative pole utmost point post electricity to realize switching on of electric current.

Specifically, with reference to fig. 1 and 2, the casing 1 is configured as a square casing structure, wherein a side surface defining the largest internal area of the casing 1 is an inner large surface 11, a side surface having a smaller area is an inner surface 12, and a side surface having the largest core package area is a front surface of the core package. In the prior art, in order to prevent the shell 1 from extruding the core package when the core package expands, a certain gap is reserved between the front surface of the core package and the large inner side surface 11 of the shell 1, so that a certain expansion space is reserved for the core package, the service life of the battery cell is prolonged, and potential safety hazards are avoided. However, due to the gap between the core pack and the housing 1, the core pack can continuously shake and collide in the housing 1 during transportation, so that the tab is pulled to generate fatigue fracture, thereby causing failure of the battery cell, and the tab can also cause pole piece displacement during pulling, thereby causing short circuit risk.

In order to solve the above problems, as shown in fig. 1 and 2, the battery cell further includes a baffle plate 2 and an elastic connection assembly 3, wherein the baffle plate 2 is disposed in the housing 1 and is parallel to the inner large surface 11 of the housing 1, a gap is formed between one side of the baffle plate 2 and the inner large surface 11 of the housing 1, and the other side of the baffle plate is abutted against the front surface of the core pack; the elastic connection component 3 is elastically connected between the baffle 2 and the large inner surface 11 of the casing 1, so that the baffle 2 can adaptively move relative to the casing 1 according to the expansion condition of the core pack, wherein the material of the baffle 2 is not limited as long as the baffle 2 does not react with the electrolyte.

When the core package is in normal state, baffle 2 and the positive looks butt of core package for the removal of restriction core package plays fixed support effect, avoids the core package to rock at will in shell 1, improves the security performance and the life of electric core. When the core package charges and expands, the thickness of the core package increases, and the baffle plate 2 is pushed to adaptively move, so that a certain space is released, the extrusion force born by the core package is reduced, after the core package discharges, the thickness of the core package is reduced, and under the action of the elastic restoring force of the elastic connecting component 3, the baffle plate 2 is reset along with the core package. Therefore, under the elastic connection effect of the elastic connection assembly 3, the baffle plate 2 can adaptively move according to the expansion condition of the core package so as to meet the dimensional change of the core package after expansion, reduce the stress of the core package, and the baffle plate 2 can play a supporting role on the core package regardless of the expansion condition, thereby maximally improving the service life of the battery cell.

Specifically, as shown in fig. 1 and 2, the elastic connection assembly 3 includes a connection rod 31 and an elastic member 32, one end of the connection rod 31 is connected to the inner large surface 11 of the housing 1, and the other end is inserted into the baffle 2, and the baffle 2 can slide relative to the connection rod 31; the elastic member 32 is sleeved on the connecting rod 31 and is located between the shell 1 and the baffle 2, one end of the elastic member 32 is abutted against the large inner side surface 11 of the shell 1, and the other end is abutted against the side surface of the baffle 2. After the core pack is placed in the accommodating cavity 15, the elastic piece 32 is in a compressed state, and the baffle 2 is tightly attached to the front surface of the core pack by the elastic force of the elastic piece 32 so as to support and fix the core pack and prevent the core pack from shaking randomly in the shell 1. When the core pack expands during charging, the thickness of the core pack increases and pushes the shutter 2 to adaptively move, and the shutter 2 continues to compress the elastic member 32 during the movement. When the core pack is discharged, the thickness of the core pack is reduced, and the baffle plate 2 is reset along with the core pack under the action of the elastic restoring force of the elastic piece 32. Therefore, under the action of the elastic piece 32, the baffle plate 2 is always abutted against the front surface of the core pack, so that the core pack is supported and fixed, and meanwhile, the self-adaptive movement of the baffle plate 2 can be realized. The connecting rod 31 can play a guiding role in the movement of the baffle 2 and the elastic member 32 to ensure that the elastic member 32 stretches and contracts only in the axial direction of itself. In this embodiment, the elastic member 32 is a spring, and in other embodiments, the elastic member 32 may be an elastic structure such as an elastic sleeve or a spring plate, which is not limited herein.

Specifically, as shown in fig. 2, the electric core includes two baffles 2, the two baffles 2 are spaced along the width direction of the casing 1 and are arranged in parallel, the casing 1 has two inner large faces 11, elastic pieces 32 are respectively sleeved on connecting rods 31 between each baffle 2 and the corresponding inner large face 11, the core package is located between the two baffles 2, and two front faces of the core package are respectively abutted against the baffles 2 on the corresponding side. When the core pack is in a normal state, under the action of the corresponding elastic piece 32, the two baffles 2 are respectively abutted against the two front sides of the core pack, so that the core pack is prevented from shaking randomly in the shell 1, and the safety performance and the service life of the battery cell are further improved. When the core pack is charged and expands, the thickness of the core pack is increased, and the two baffles 2 are pushed to move adaptively, so that a certain space is released, the extrusion force borne by the core pack is reduced, and the service life of the battery cell is prolonged to the maximum extent. When the core pack is discharged, the thickness of the core pack is reduced, and the two baffles 2 are reset along with the core pack under the action of elastic restoring force of the elastic piece 32.

Preferably, as shown in fig. 2, the connecting rod 31 is simultaneously threaded through two baffles 2, and two ends of the connecting rod 31 are respectively fixed on two inner large surfaces 11 of the housing 1. That is, the two baffles 2 can share one connecting rod 31, so that the structure is compact, the stable movement of the baffles 2 is ensured, the manufacturing cost is saved, and the workload of the operators for disassembling the connecting rod 31 is reduced.

Specifically, referring to fig. 2, the baffle 2 is in a square structure, the number of the connecting rods 31 is four, the four connecting rods 31 are respectively arranged at four corners of the baffle 2, and two ends of each connecting rod 31 are respectively sleeved with an elastic piece 32. Through setting up four connecting rods 31 in the four corners of baffle 2 respectively for the core package is located two baffles 2 and four connecting rods 31 jointly limited space, thereby guarantees that connecting rod 31 does not interfere with the core package. Under the combined action of the four connecting rods 31 and the corresponding elastic pieces 32, the stress of the core package is uniform, the safety performance and the service life of the battery cell are further improved, and the baffle plate 2 moves more stably. In other embodiments, three, four or more connecting rods 31 may be disposed on each side of the housing 1 along the length direction, and may be flexibly disposed according to the requirement, which is not limited herein.

Further, as shown in fig. 3 and 4, a gap is provided between both ends of the baffle plate 2 in the longitudinal direction and the inner side surface 12 of the housing 1, a gap is provided between the bottom end of the baffle plate 2 and the bottom surface 13 of the housing 1, and the top end of the baffle plate 2 is lower than the upper end surface 14 of the housing 1. That is, both ends of the baffle 2 in the length direction and both ends in the height direction are not in contact with the housing 1, so that in the moving process of the baffle 2, the sliding friction force can be reduced, the smooth and steady movement of the baffle 2 is ensured, and the core-wrap stress is further reduced. The top end of the baffle plate 2 is lower than the upper end surface 14 of the shell 1, so as to leave an installation space for the top cover structure and avoid interference collision between the baffle plate 2 and the top cover structure.

Further, a pressure sensor is provided on the side of the baffle 2 facing away from the core pack or on the inner large surface 11 of the housing 1, the pressure sensor being used for detecting the pressure exerted by the baffle 2 on the core pack. Taking the case that the pressure sensor is arranged on the large inner side surface 11 of the shell 1 as an example, when the core pack expands, the thickness of the core pack increases, the baffle plate 2 is pushed to adaptively move, and the baffle plate 2 is abutted against the pressure sensor after a certain distance of movement, so that the pressure sensor can measure the pressure acted on the baffle plate 2 after the core pack expands, and the pressure is the pressure applied on the core pack by the baffle plate 2. The pressure sensor is electrically connected with a Battery Management System (BMS) of the battery pack, so that the internal safety of the battery cell is monitored in real time through the Battery Management System (BMS), and the safety performance of the battery cell is improved. It should be noted that, the Battery Management System (BMS) belongs to the prior art, and the specific structure and the working principle thereof are not described herein.

The embodiment also provides a battery module, which comprises the battery cell in the embodiment. Since the specific structure and technical effects of the battery cell have been described in detail in the foregoing, the detailed description is omitted herein. The battery module provided by the embodiment can maximally improve the service life of the battery module by arranging the battery cell.

The embodiment also provides a battery pack, which comprises the battery module. The battery pack provided by the embodiment can maximally improve the service life of the battery pack by arranging the battery module.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims

1. A cell, comprising:

a shell (1) and a core pack, wherein the core pack is accommodated in the shell (1);

a baffle plate (2) arranged in the shell (1), wherein a gap is formed between one side of the baffle plate (2) and the inner large surface (11) of the shell (1), and the other side of the baffle plate is abutted against the front surface of the core pack;

and the elastic connecting component (3) is elastically connected between the baffle plate (2) and the large inner side surface (11) of the shell (1) so that the baffle plate (2) can adaptively move relative to the shell (1) according to the expansion condition of the core pack.

2. The cell according to claim 1, characterized in that the elastic connection assembly (3) comprises:

a connecting rod (31), one end of which is connected with the inner large surface (11) of the shell (1), the other end of which is penetrated through the baffle (2), and the baffle (2) can slide relative to the connecting rod (31);

elastic piece (32), cover are located connecting rod (31) and be located shell (1) with between baffle (2), the one end butt of elastic piece (32) in the big face (11) of the inboard of shell (1), the other end butt in the side of baffle (2).

3. The battery cell according to claim 2, characterized in that the battery cell comprises two baffles (2), the two baffles (2) are arranged at intervals and in parallel along the width direction of the shell (1), the shell (1) is provided with two inner large surfaces (11), the connecting rod (31) between each baffle (2) and the corresponding inner large surface (11) is sleeved with the elastic piece (32), the core package is positioned between the two baffles (2), and the two front surfaces of the core package are respectively abutted against the corresponding baffles (2) on one side.

4. A cell according to claim 3, characterized in that the connecting rod (31) is simultaneously threaded through two baffles (2), and both ends of the connecting rod (31) are respectively fixed on two inner large faces (11) of the housing (1).

5. The battery cell according to claim 4, wherein the baffle (2) is in a square structure, the number of the connecting rods (31) is four, the four connecting rods (31) are respectively arranged at four corners of the baffle (2), and the two ends of each connecting rod (31) are respectively sleeved with the elastic piece (32).

6. A cell according to any of claims 1-5, characterized in that a pressure sensor is provided on the side of the baffle (2) facing away from the core pack or on the inner large surface (11) of the housing (1), said pressure sensor being adapted to detect the pressure exerted by the baffle (2) on the core pack.

7. The cell according to any one of claims 1 to 5, wherein a gap is provided between both ends of the baffle plate (2) in the length direction and the inner side surface (12) of the housing (1), a gap is provided between the bottom end of the baffle plate (2) and the bottom surface (13) of the housing (1), and the top end of the baffle plate (2) is lower than the upper end surface (14) of the housing (1).

8. The cell according to any of claims 1-5, further comprising a cap structure, which cap structure is snapped onto the open end of the housing (1).

9. A battery module comprising the cell according to any one of claims 1 to 8.

10. A battery pack comprising the battery module according to claim 9.