CN216145712U

CN216145712U - Battery shell and battery

Info

Publication number: CN216145712U
Application number: CN202121476200.6U
Authority: CN
Inventors: 马猛超; 殷立梅
Original assignee: Mobai Beijing Information Technology Co Ltd
Current assignee: Mobai Beijing Information Technology Co Ltd
Priority date: 2021-06-29
Filing date: 2021-06-29
Publication date: 2022-03-29
Anticipated expiration: 2031-06-29

Abstract

The present disclosure provides a casing of a battery, the casing including two first side walls disposed oppositely and two second side walls disposed oppositely at both ends of the first side walls, the two first side walls being located in an expansion direction of a cell unit; the two first side walls and the two second side walls enclose a cavity; a side plate is arranged on one side of at least one first side wall facing the cavity, and a hollow structure is formed between the side plate and the first side wall; and a support structure is arranged in the hollow structure and is respectively connected with the first side wall and the side plate.

Description

Battery shell and battery

Technical Field

The disclosed embodiments relate to the technical field of battery cases, and more particularly, to a battery case and a battery.

Background

The lithium ion battery applied to the electric bicycle generally packages a plurality of battery cell units in a packaging structure made of metal or plastic materials to form a battery cell module, and then places the battery cell module in a shell of the battery.

The electric core unit can generate heat and expand in the working process, the shell of the battery can deform due to the extrusion of the expansive force of the electric core, and the shell of the battery can crack when the shell is serious, so that the electric core module or the electric core unit is directly exposed in the atmosphere, and potential safety hazards are caused.

And the packaging structure of the existing battery cell module has the advantages of large mass, more structural components and high cost.

SUMMERY OF THE UTILITY MODEL

An object of the present disclosure is to provide a new technical solution for a battery case and a battery.

In one aspect, the present disclosure provides a battery case including two first sidewalls disposed opposite to each other, and two second sidewalls disposed at both ends of the first sidewalls and disposed opposite to each other. The two first side walls are located in the expansion direction of the cell unit. The two first side walls and the two second side walls enclose a cavity. A side plate is arranged on one side of at least one first side wall facing the cavity, and a hollow structure is formed between the side plate and the first side wall. And a support structure is arranged in the hollow structure and is respectively connected with the first side wall and the side plate.

Optionally, one end of the side plate is connected to one of the second side walls, and the other end of the side plate is connected to the other of the second side walls.

Optionally, a reinforcing structure is respectively disposed at the connection positions of the first side wall and the two second side walls. One end of the side plate is connected with one of the reinforcing structures, and the other end of the side plate is connected with the other reinforcing structure.

Optionally, the first side wall, the second side wall, the support structure and the side panel form an integral structure.

Optionally, at least one reinforcing rib is arranged on one side of the second side wall facing the cavity, and the reinforcing rib and the second side wall form an integral structure.

Optionally, an end surface of the reinforcing rib facing one side of the cavity is arc-shaped.

Optionally, the reinforcing ribs are multiple, a recess is formed between adjacent reinforcing ribs and between the reinforcing rib and the first side wall, and a buffer element is arranged in the recess.

Optionally, the cushioning element at least partially covers the stiffener.

On the other hand, this disclosure provides a battery, including electric core module and the shell of aforementioned battery, electric core position module is located in the shell of battery, electric core module includes a plurality of electric core units, the range upon range of setting of electric core unit, the range upon range of direction of electric core unit is electric core unit's inflation direction.

Optionally, the battery cell module further comprises an organic film layer arranged around the battery cell module, and the organic film layer is provided with at least one through hole. The organic film layer is provided with an opening end, the battery cell module is wrapped by the organic film layer, and a tab unit of the battery cell module extends out of the organic film layer from the opening end.

Alternatively, insulating layers are provided in the organic film layer on both sides in the stacking direction.

One beneficial effect of the disclosed embodiment lies in that the damage of the cell module to the shell of the battery due to the stress generated by the expansion in the expansion direction is effectively relieved. Avoided because of the too big pressure of applying in battery case because of the inflation of electricity core module, leaded to the cracked condition of shell to take place.

Other features of the present description and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the specification and together with the description, serve to explain the principles of the specification.

Fig. 1 is a schematic cross-sectional structure of a case of a battery in an embodiment of the present disclosure.

Fig. 2 is a schematic view of a partial structure of a case of a battery in one embodiment of the present disclosure.

Fig. 3 is a schematic diagram of a partial structure of a battery in one embodiment of the present disclosure.

Fig. 4 is a schematic diagram of a battery structure in one embodiment of the present disclosure.

Reference numerals:

100: an upper end cover; 200: a battery cell module; 300: an organic film layer; 400: a housing; 500: a lower end cover; 201: a cell unit; 202: a tab unit; 204: an insulating layer; 301: a through hole; 401: a first side wall; 402: a second side wall; 403: a side plate; 404: a cavity; 405: reinforcing ribs; 406: a reinforcing structure; 407: a connecting portion; 408: a support structure; 409: a buffer element; 410: a recessed portion; 411: and (3) a hollow structure.

Detailed Description

Reference will now be made in detail to the embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of illustrating the present disclosure and should not be construed as limiting the same. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

The features of the terms first and second in the description and in the claims of the present disclosure may explicitly or implicitly include one or more of such features. In the description of the present disclosure, "a plurality" means two or more unless otherwise specified.

In the description of the present disclosure, it is to be understood that the terms "center," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing and simplifying the disclosure, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be considered as limiting the disclosure.

In the description of the present disclosure, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present disclosure can be understood in specific instances by those of ordinary skill in the art.

As shown in fig. 1 and 2, the present disclosure provides a housing 400 for a battery. The housing 400 includes two first sidewalls 401 disposed oppositely, and two second sidewalls 402 disposed oppositely at both ends of the first sidewalls 401. Two first side walls 401 and two second side walls 402 enclose a cavity 404.

Specifically, the case 400 of the battery includes two first sidewalls 401, two second sidewalls 402, an upper end cap 100, and a lower end cap 500. The upper and

lower end caps

100 and 500 of the battery case 400 and the two first and

second sidewalls

401 and 402 of the battery constitute the case 400 of the battery. The battery cell module 200 is fixed on the first sidewall 401, and the cavity 404 enclosed by the second sidewall. The battery cell module 200 is fixedly connected to the lower end cap 500.

As shown in fig. 1 and 2, the two first side walls 401 are located in the expansion direction of the cell unit 201.

The battery cell module 200 includes a plurality of battery cell units 201, and the size of a plurality of battery cell units 201 is the same. A plurality of the cell units 201 are stacked.

The battery cell unit 201 is a soft-package lithium ion power module. The battery cell unit 201 includes a positive plate, a negative plate, an electrolyte, a diaphragm, and a soft package structure, and the soft package structure is an aluminum plastic film. During operation of the cell unit 201, the cells may swell for various reasons. For example, when the capacity of the battery cell module 200 is increased by increasing the number of the battery cell units 201, or when the capacity of each battery cell unit 201 is increased, the battery cell units 201 generate significant volume expansion in the charging and discharging process.

The first side wall 401 refers to a side wall of the casing 400 perpendicular to the expansion direction of the cell unit 201. As shown in fig. 1 and 2, the first side wall 401 is a side wall where a long side of the case 400 of the battery is located, and correspondingly, the second side wall 402 is a side wall where a short side of the case 400 of the battery is located.

As shown in fig. 1 and 2, a side plate 403 is disposed on a side of the at least one first side wall 401 facing the cavity 404, and a hollow structure 411 is formed between the side plate 403 and the first side wall 401.

A side plate 403 may be disposed on the first side wall 401 of the battery, that is, the side of one of the first side walls 401 perpendicular to the expansion direction of the cell unit 201, which faces the cavity 404; a side plate 403 may be provided on each of the two first side walls 401 perpendicular to the expansion direction of the cell unit 201.

As shown in fig. 1 and 2, one end of the side plate 403 is connected to one of the second side walls 402, and the other end of the side plate 403 is connected to the other second side wall 402. A hollow structure 411 is formed between the side plate 403 and the first side wall 401. The hollow structure 411 is formed by a portion of the first sidewall 401, the side plate 403, and the two second sidewalls 402.

Through the arrangement of the hollow structure 411, the stress of the cell unit 201 in the expansion direction due to expansion is effectively relieved. The situation that the pressure applied to the battery shell 400 by the battery cell module 200 formed by the battery cell units 201 is too large, so that the shell 400 is broken is avoided.

In one embodiment of the present disclosure, side plates 403 are respectively disposed on the sides of the two first sides facing the cavity 404, and two hollow structures 411 perpendicular to the expansion direction of the cell module 200 composed of the cell units 201 are formed between the side plates 403 and the first side walls 401.

As shown in fig. 1-4, a support structure 408 is provided within the hollow structure 411, the support structure 408 being connected to the first side wall 401 and the side plate 403, respectively.

The hollow structure 411 is structurally reinforced by providing a support structure 408 inside the hollow structure 411 connecting the first side wall 401 and the side plate 403. The stress generated by the expansion of the battery cell module 200 is prevented from excessively compressing the hollow structure 411, which may result in damage to the battery case 400.

For example, the support structure 408 is a reinforcing rib. At least one reinforcing rib is formed within the hollow structure 411, the reinforcing rib connecting the first side wall 401 and the side plate 403, forming a support structure 408 for the hollow structure 411. The reinforcing rib can be arranged into 1 strip, and can also be provided with a plurality of strips, such as 2 strips, 4 strips, 5 strips and the like.

When the cell module 200 expands, pressure is applied to the side plate 403, and the side plate 403 protrudes outward and deforms. By providing support structures 408, e.g., reinforcing ribs, the side panels 403 can be effectively supported. And transmits the pressure generated by the expansion of the cell module 200 to the housing 400 through the reinforcing ribs, so that the stress is dispersed. Simultaneously, can effectively restrain telecommunications module 200's excessive inflation to the expanded restriction that plays of electric core module 200.

Optionally, the support structure 408 is a reinforcing rib that extends axially through the hollow structure 411. Or radially disposed reinforcing ribs. The skilled person will be able to select it as desired. The shape of the cross section of the reinforcing rib is not particularly limited, and may be a straight shape, a T shape, a cross shape, or other cross-sectional shapes.

Alternatively, as shown in fig. 1-4, the support structure 408 divides the hollow structure 411 into N sections, N being an integer greater than or equal to 2.

For example, the support structure 408 is two reinforcing ribs disposed along the axial direction of the housing 400, and the two reinforcing ribs are spaced apart to divide the hollow structure 411 into three parts. In this way, the stress of the hollow structure 411 can be effectively dispersed.

Optionally, the support structure 408 divides the hollow structure 411 into N uniform sections. If the support structure 408 is two reinforcing ribs arranged along the axial direction of the housing 400, the two reinforcing ribs are arranged at intervals to divide the hollow structure 411 into three uniform parts. In this way, the force applied to each portion of the support structure 408 is made more uniform, and the force applied to the hollow structure 411 can be further dispersed.

In one embodiment, a connecting portion 407 is provided on an end surface of the support structure 408, and the connecting portion 407 is used for connecting with end caps at both ends of the housing 400.

For example, a connection portion 407 is provided on the support structure 408. The support structure 408 is a reinforcing rib provided axially along the housing 400 through the hollow structure 411. Screw holes are provided at both end portions of the reinforcing rib in the axial direction of the housing 400, respectively. Screw holes are also provided at corresponding positions of the upper and

lower end caps

100 and 500 of the battery case 400. The side walls of the battery case 400 can be fastened and connected to the upper and lower end caps of the battery case 400 by fastening screws.

Through such setting, the effectual battery case 400 problem of damaging that leads to of the inflation of the electric core module 200 of having avoided the constitution of electricity core unit 201. And the support structure 408 in the present disclosure is provided with a connection portion 407 that can be connected with an end cap of the battery or other structural members in the battery. The parts of the battery are effectively reduced. The battery assembly efficiency is improved.

As shown in fig. 1 and 2, in one embodiment of the present disclosure, the first sidewall 401, the second sidewall 402, the support structure 408, and the side plate 403 form a unitary structure.

The structure of the housing 400 in the embodiment of the present disclosure is formed, for example, by integral press molding, integral injection molding, or the like. Through the mode, the production efficiency is effectively improved.

As shown in fig. 1 and 2, in one embodiment of the present disclosure, reinforcing structures 406 are respectively disposed at the junctions of the first side wall 401 and the two second side walls 402, one end of the side plate 403 is connected to one of the reinforcing structures 406, and the other end of the side plate 403 is connected to the other reinforcing structure 406.

In the hollow structure 411, in addition to the support structure 408, a reinforcing structure 406 is provided at the junction of the first side wall 401 to the second side wall 402, i.e., at the corner.

The hollow structure 411 of the battery case 400 is disposed in the expansion direction of the cell module 200 composed of the cell units 201 in the present disclosure. Each reinforcing structure 406 is connected to a first side wall 401, a second side wall 402 and a side plate 403. One end of the side plate 403 is connected to one of the reinforcing structures 406 and the other end of the side plate 403 is connected to the other reinforcing structure 406.

For example, the reinforcing structure 406 is a triangular cross-section reinforcing rib that may be disposed through the hollow structure 411. The triangular section reinforcing ribs may also be corner supports provided only at both ends in the axial direction of the hollow structure 411.

By providing the reinforcing structure 406 at the corner, it is possible to achieve increased strength and rigidity of the article without increasing the wall thickness of the shell. Meanwhile, the distortion of the housing 400 caused by the uneven stress due to the thickness difference between the hollow structure 411 and the second side wall 402 formed by the first side wall 401 and the side plate 403 can be overcome.

Optionally, a connection 407 is also provided on the reinforcing structure 406. For example, the connection portion 407 is a screw hole, and a cover of the housing 400 and other structural members may be screwed thereto.

In one embodiment of the present disclosure, at least one rib 405 is disposed on a side of the second sidewall 402 facing the cavity 404, and the rib 405 is formed as an integral structure with the second sidewall 402. The end surface of the rib 405 on the side facing the cavity 404 is curved.

On the side of the second side wall 402 facing the cavity 404, at least one reinforcement rib 405 is provided. The reinforcing ribs 405 are used for abutting against the battery cell module 200. The arrangement direction and number of the ribs 405 are not limited in this disclosure. The number of ribs 405 may be 1, 3 or 4.

For example, set up strengthening rib 405 along the axial interval of shell 400 for spacing with battery module 200, restriction battery module 200 rocks in the battery.

The surface of strengthening rib 405 towards one side of cavity 404 is the cambered surface, and through setting up strengthening rib 405 that the surface is the cambered surface, avoid when strengthening rib 405 carries out spacingly to electric core module 200, the aluminium-plastic membrane of electric core unit 201 is punctureed with the contact surface of electric core unit 201 to strengthening rib 405 on shell 400.

The ribs 405 are integrally formed with the second sidewall 402 by an integral molding process, such as injection molding or extrusion molding.

As shown in fig. 1 to 4, in one embodiment of the present disclosure, the reinforcing beads 405 are a plurality of beads, recesses 410 are formed between adjacent beads 405 and between the beads 405 and the first sidewall 401, and a buffer member 409 is disposed in the recess 410.

The cushioning element 409 is disposed in the recess 410 between the plurality of ribs 405, and the cushioning element 409 may be foam.

In one embodiment of the present disclosure, the buffer member 409 at least partially covers the bead 405 to further prevent collision between the cell module 200 and the bead 405 when the bead 405 is in contact with the cell module 200.

The cushioning element 409 is a foam that covers the second sidewall 402. Part of the foam covers the ribs 405. A portion of the foam can fill the recess 410.

For example, foam is respectively disposed on the sides of the two second sidewalls 402 facing the cavity 404, and covers the surface of the rib 405 and fills the recess 410. Through set up the cotton mode of bubble at second lateral wall 402, effectively cushioned the collision of strengthening rib 405 to electric core unit 201, further protected electric core unit 201.

As shown in fig. 3 and fig. 4, the present disclosure provides a battery, including the casing 400 of the above-mentioned battery, the cell site module is located in the casing 400 of the battery, the cell module 200 includes a plurality of cell units 201, the cell units 201 are stacked, and the stacking direction of the cell units 201 is the expansion direction of the cell units 201.

In one embodiment of the present application, a battery is provided, including a battery housing 400 of the present disclosure. The upper end cap 100 of the casing 400 has a through hole 301 that avoids the tab unit 202 of the cell module 200. A bus bar (not shown) for connecting the cell modules 200 in series or in parallel is provided in the through hole 301. The lower surface of the upper cap 100 is provided with a groove (not shown) for receiving the bus bar. The upper end cap 100 is further provided with an opening, and the opening is provided with an electrical connection portion for connecting with an external device.

The tab unit 202 includes a positive tab and a negative tab.

The battery cell module 200 is composed of a plurality of battery cell units 201, and the battery cell units 201 are sequentially stacked from the front to the back along the short side direction of the casing 400. For example, each cell unit 201 is a laminated soft pack lithium ion power module. The tab units 202 of each cell unit 201 are sequentially stacked and arranged towards the same end to form the cell module 200.

In an embodiment of the present disclosure, as shown in fig. 3 and fig. 4, an organic film layer 300 is disposed around the battery cell module 200, the organic film layer 300 has an open end, the battery cell module 200 is wrapped by the organic film layer 300, and the tab unit 202 of the battery cell module 200 extends out of the organic film layer 300 from the open end.

The organic film 300 is a film with an opening at one end, and the pole unit 202 of the battery cell module 200 composed of the battery cell units 201 extends out from the opening end of the organic film 300, and is electrically connected with the upper end cap 100 of the battery case 400 after being connected in series or in parallel by bus bars. The organic film 300 is U-shaped and covers the cell module 200.

Through being provided with around wrapping up battery core module 200's organic rete 300 outside battery core module 200, effectively avoided prior art, need the equipment step in the encapsulation casing of metal or plastics with battery core module 200 encapsulation. The quality of the battery cell module 200 is effectively reduced, and the overall assembly efficiency of the battery is improved.

Because directly place electric core module 200 in shell 400, the edge of shell 400 has the risk of scratch electric core module 200, has reduced the reliability of battery. The organic film layer 300 is disposed outside the battery cell module 200. The risk that the battery case 400 scratches the battery cell module 200 is effectively avoided.

In addition, the organic film layer 300 has elasticity. The organic film 300 can provide a buffer space for battery expansion, and when the battery cell module 200 expands and extrudes the organic film 300, the organic film 300 exerts a reverse acting force on the battery cell module 200. Limiting the over-expansion of the cell module 200. The organic film layer 300 is made of synthetic rubber or plastic.

The pole units 202 of the cell units 201 constituting the cell module 200 are all oriented in the same direction. The tab unit 202 extends out of the organic film layer 300 from the open end of the organic film layer 300 and is electrically connected to the bus bar.

Optionally, as shown in fig. 3-4, at least one through hole 301 is disposed on the organic film layer 300. Set up through-hole 301 on organic rete 300 is when carrying out the encapsulating to electric core module 200, and the colloid can pass through from through-hole 301 on organic rete 300 to contact battery's shell 400 and electric core module 200. Thereby firmly fixing the case 400 of the battery and the battery module together. In this way, the cell module 200 is prevented from shaking in the battery case 400. Meanwhile, the fixing support of the battery cell module 200 can be replaced by a glue pouring mode, so that the weight of the battery can be further reduced, and the cost of the battery is reduced.

Alternatively, a through hole 301 may be formed on the organic film layer 300. The size of the area of the through hole 301 can be selected by those skilled in the art as desired.

Optionally, as shown in fig. 3 to 4, a plurality of through holes 301 are disposed on three contact surfaces of the organic film 300 and the cell module 200. The plurality of through holes 301 are arranged in an array.

Optionally, the through holes 301 are uniformly arranged on the contact surface between each organic film layer 300 and the battery cell module 200.

The shape of the through hole 301 formed in the organic film 300 can be selected by a person skilled in the art according to the needs. It can be quadrilateral, arc, triangle or irregular shape.

In one embodiment of the present application, as shown in fig. 3 to 4, insulating layers 204 are disposed in the organic film layer 300 on both sides in the stacking direction. That is, the insulating layer 204 is disposed on two contact surfaces of the outermost cell unit 201 of the cell module 200 and the organic film layer 300. For example, the insulating layer 204 is foam. The insulating layer 204 functions as insulation. Meanwhile, a buffer space can be further provided for the expansion of the battery.

Through the technical scheme that this disclosure provided, on the one hand, the harm of the produced stress of electric core module 200 because of the inflation on the inflation direction to the shell 400 of battery has been alleviated effectively. The situation that the battery shell 400 is broken due to overlarge pressure applied to the battery shell 400 by the expansion of the battery cell module 200 is avoided. On the other hand, the weight and production cost of the battery can be reduced. While further improving the efficiency of the assembly of the cell.

In the description herein, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means 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 disclosure. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present disclosure have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the disclosure, the scope of which is defined by the claims and their equivalents.

Claims

1. A casing of a battery, wherein the casing comprises two first side walls which are oppositely arranged and two second side walls which are positioned at two ends of the first side walls and are oppositely arranged, and the two first side walls are positioned in the expansion direction of a cell unit;

the two first side walls and the two second side walls enclose a cavity;

a side plate is arranged on one side of at least one first side wall facing the cavity, and a hollow structure is formed between the side plate and the first side wall;

and a support structure is arranged in the hollow structure and is respectively connected with the first side wall and the side plate.

2. The battery casing of claim 1, wherein one end of the side plate is connected to one of the second side walls, and the other end of the side plate is connected to the other of the second side walls.

3. The battery casing according to claim 1 or 2, wherein a reinforcing structure is provided at the junction of the first side wall and the two second side walls, respectively, one end of the side plate is connected to one of the reinforcing structures, and the other end of the side plate is connected to the other reinforcing structure.

4. The battery enclosure of claim 1, wherein the first sidewall, the second sidewall, the support structure, and the side plate form a unitary structure.

5. The battery casing of claim 1, wherein at least one rib is disposed on a side of the second side wall facing the cavity, the rib and the second side wall form an integral structure, and an end surface of the rib facing the cavity is curved.

6. The battery case according to claim 5, wherein the reinforcing ribs are plural, recesses are formed between adjacent reinforcing ribs and between the reinforcing ribs and the first side wall, and a buffer member is provided in the recesses.

7. The battery housing of claim 6, wherein the cushioning element at least partially covers the stiffener.

8. A battery, comprising a cell module and the housing of the battery of any one of claims 1 to 7, wherein the cell module is located in the housing of the battery, the cell module includes a plurality of cell units, the cell units are stacked, and the stacking direction of the cell units is the expansion direction of the cell units.

9. The battery of claim 8, further comprising an organic film layer disposed around the cell module, wherein at least one through hole is disposed in the organic film layer, the organic film layer has an open end, the organic film layer wraps the cell module, and a tab unit of the cell module extends out of the organic film layer from the open end.

10. The battery according to claim 9, wherein insulating layers are provided in the organic film layer on both sides in the stacking direction.