CN215771344U

CN215771344U - Battery pack

Info

Publication number: CN215771344U
Application number: CN202121639379.2U
Authority: CN
Inventors: 刘萱; 赵念斌; 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: 2021-07-19
Filing date: 2021-07-19
Publication date: 2022-02-08
Anticipated expiration: 2031-07-19

Abstract

The utility model discloses a battery pack, and belongs to the technical field of batteries. The battery comprises a battery core stacking body, wherein the battery core stacking body comprises a plurality of battery cores which are connected in series or in parallel and stacked along a first direction, the width direction of the battery cores is a second direction, the length direction of the battery cores is a third direction, and the first direction, the second direction and the third direction are mutually vertical; the shell assembly comprises an insulating film and a shell, the insulating film is wrapped outside the battery cell stacking body, the shell is wrapped outside the insulating film, and the shell is provided with a ventilation window. The battery pack has good heat dissipation effect, avoids thermal runaway, and improves the use safety of the battery pack.

Description

Battery pack

Technical Field

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

Background

The traditional soft package battery adopts an aluminum-plastic film as a shell of the battery pack, and the aluminum-plastic film shell has light weight, so that the weight of the soft package battery is 40% lighter than that of a steel-shell lithium battery with the same capacity and 20% lighter than that of an aluminum-shell battery; compared with a battery pack with the same size specification, the soft package battery has larger capacity, so that the energy density of the soft package battery is high.

But laminate polymer battery's radiating effect is poor, uses a period when laminate polymer battery, takes place thermal runaway easily to make laminate polymer battery's safety in utilization low.

Therefore, a battery pack with good heat dissipation effect is needed to solve the above technical problems in the prior art.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a battery pack which has a good heat dissipation effect, avoids thermal runaway and improves the use safety of the battery pack.

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

a battery pack, comprising:

the battery cell stacking body comprises a plurality of battery cells, the battery cells are connected in series or in parallel and stacked along a first direction, the width direction of the battery cells is a second direction, the length direction of the battery cells is a third direction, and the first direction, the second direction and the third direction are mutually perpendicular;

the shell assembly comprises an insulating film and a shell, the insulating film wraps the battery cell stacking body, the shell wraps the insulating film, and a ventilation window is formed in the shell.

As a preferable technical solution of the battery pack, a normal direction of a plane in which the ventilation window is located is the same as the second direction.

As a preferred technical scheme of the battery pack, the shell is provided with an exhaust hole.

As a preferred technical scheme of battery package, shell subassembly still includes the insulation protection shield, the electric core stack body is followed the both sides of second direction all are provided with the insulation protection shield, just the insulation protection shield is located the insulating film with between the shell, the ventilation window is just right the heat dissipation grid has been seted up on the insulation protection shield.

As a preferable technical solution of the battery pack, the heat dissipation grid of the insulation protection plate is filled with a heat conductive glue.

As a preferred technical scheme of the battery pack, the length of the battery core is less than 600 mm.

As a preferred technical scheme of the battery pack, the battery pack further comprises a positive current collecting piece and a negative current collecting piece, the positive current collecting piece and the negative current collecting piece are both connected with the battery cell stacking body, and the positive current collecting piece and the negative current collecting piece are both made of aluminum.

As a preferred technical solution of the battery pack, the positive current collector and the negative current collector are both connected to the cell stack by laser welding.

As a preferred technical scheme of a battery package, the battery package still includes output pole switching structure, output pole switching structure includes insulating support, anodal output, negative pole output and voltage sensor, anodal output the negative pole output with voltage sensor all set up in on the insulating support, anodal output with negative pole output respectively with anodal current collector with the negative pole current collector is connected, voltage sensor connect in anodal current collector with on the negative pole current collector.

As a preferred technical scheme of battery package, set up the information acquisition position on the shell subassembly for gather the information of electric core stack.

The utility model provides a battery pack which comprises a battery cell stack body and a shell assembly, wherein the shell assembly comprises an insulating film and a shell, and a ventilation window is arranged on the shell to ensure that the battery cell stack body can radiate heat well, avoid thermal runaway of the battery pack and improve the use safety of the battery pack.

Drawings

Fig. 1 is a schematic structural diagram of a battery pack according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a cell stack according to an embodiment of the present invention;

fig. 3 is a top view of a cell stack provided in an embodiment of the utility model;

fig. 4 is a schematic structural diagram of a cell stack and an insulating film according to an embodiment of the present invention;

fig. 5 is a schematic structural view of an insulating protection plate according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a housing provided in accordance with an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of an output electrode switching structure according to an embodiment of the present invention;

FIG. 8 is an exploded view of an output pole transition structure provided in accordance with an embodiment of the present invention;

fig. 9 is a schematic structural view of a plurality of battery packs mounted to a vehicle underbody according to an embodiment of the present invention.

Reference numerals:

1. a cell stack body;

2. a housing assembly; 21. an insulating film; 22. a housing; 221. a ventilation window; 222. an exhaust hole; 23. an insulating protection plate; 231. a heat dissipation grid;

3. an output electrode switching structure; 31. an insulating support; 32. a positive output member; 33. a negative output member; 34. a voltage sensor.

Detailed Description

In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings.

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

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

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

As shown in fig. 1 to 6, the present embodiment provides a battery pack including a battery cell stack 1 and a case assembly 2, where the battery cell stack 1 includes a plurality of battery cells, the plurality of battery cells are connected in series or in parallel and are stacked in a first direction, a width direction of the battery cells is a second direction, a length direction of the battery cells is a third direction, and the first direction, the second direction and the third direction are perpendicular to each other; the shell assembly 2 comprises an insulating film 21 and a shell 22, the insulating film 21 is wrapped outside the cell stack body 1, the shell 22 is wrapped outside the insulating film 21, and the shell 22 is provided with a ventilation window 221. Through set up ventilation window 221 on shell 22, shortened to the route of external heat transfer, improved heat transfer efficiency to guarantee the heat dissipation that electric core stack 1 can be good, avoid the battery package to take place thermal runaway, improve the safety in utilization of battery package.

Preferably, the length of the battery cell is less than 600mm, so that compared with the conventional blade battery, the internal resistance of the battery cell is reduced, and the energy conversion efficiency of the battery cell is improved. In this embodiment, the number of the cells in the third direction is two. In other embodiments, the number of cells in the third direction may be adjusted according to the length of the cells. Because the increase along the total length of third direction electricity core, the intensity that needs shell subassembly 2 improves to stack body 1's effective support to electric core, consequently, under the circumstances that guarantees that the overall strength of battery package satisfies the requirement, when the length of adjustment electricity core and the quantity along third direction electricity core. Besides the length of the battery cell is adjustable, the thickness of the battery cell along the first direction can be adjusted, and the stacking number of the battery cells along the first direction is adjusted according to the thickness of the battery cell. The battery cell of the embodiment can have the advantages of the blade battery cell by adopting the thickness range of the blade battery cell, the strength of the battery cell is improved, and meanwhile, the battery pack can have the same assembly advantages as the blade battery cell in the technical schemes of CTP (cell to pack) and CTC (cell to Car).

The number of series connections and the number of parallel connections of the cells in the cell stack body 1 can be freely combined according to the requirements. In the battery field, the serial connection and parallel connection modes of the battery cells in the battery pack are mature technologies, and the specific serial connection and parallel connection modes are not described herein again. In this embodiment, the serial connection and parallel connection modes of the cells are not limited. Optionally, the battery cell stack body 1 can be used as a standard component, can be used for CTP and CTC technical schemes, and is low in mass production and manufacturing cost.

Preferably, the normal direction of the plane where the ventilation window 221 is located is the same as the second direction, that is, the ventilation window 221 is opened on one or two of the two opposite surfaces of the casing 22 along the second direction, and since the cells are stacked along the first direction, the two opposite surfaces of the casing 22 along the second direction are opposite to the plurality of cells in the cell stack body 1, and therefore, the ventilation window 221 can enable more cells to dissipate heat through the ventilation window 221, and the heat dissipation capability of the battery pack is improved. In other embodiments, the ventilation window 221 is not limited to be opened on two opposite sides of the housing 22 in the second direction, but may be opened on two opposite sides of the housing 22 in the first direction. In the present embodiment, one of two opposite surfaces of the housing 22 along the second direction is opened with a plurality of square ventilation windows 221. In other embodiments, the shape of the louver 221 may be any shape, such as circular, triangular, etc.

As shown in fig. 6, the casing 22 is provided with an exhaust hole 222 for exhausting gas from the battery pack.

As shown in fig. 1 and 5, the housing assembly 2 further includes an insulation protection plate 23, the insulation protection plates 23 are disposed on both sides of the cell stack body 1 along the second direction, and the insulation protection plate 23 is located between the insulation film 21 and the housing 22, so that when a cell wrapped with the insulation film 21 is loaded into the housing 22, corners of the cell are protected from being damaged, the insulation protection plate 23 facing the ventilation window 221 is provided with a heat dissipation grid 231, and the heat dissipation grid 231 is used for dissipating heat of the cell stack body 1. Preferably, in the present embodiment, the thickness of the insulating protection plate 23 is 0.5mm to 5 mm. Further preferably, the material of the insulating protection plate 23 is plastic.

Preferably, the heat dissipation grid 231 of the insulation protection plate 23 is filled with a heat conductive glue, so that when the insulation protection plate 23 is fixed on the insulation film 21, the battery cell can directly contact with the refrigerant, and the thermal resistance is low, so as to perform a rapid heat dissipation function.

The battery pack further comprises an anode current collector and a cathode current collector, the anode current collector and the cathode current collector are both connected with the battery cell stacking body 1, and the anode current collector and the cathode current collector are both made of aluminum. Preferably, the positive current collector and the negative current collector are connected with the battery cell stack 1 by laser welding, and compared with a connection method using a fixing member such as a screw, the laser welding can further reduce the overall weight of the battery pack and improve the energy density of the battery.

Preferably, as shown in fig. 7 and 8, the battery pack further includes an output electrode adapter 3, the output electrode adapter 3 includes an insulating support 31, a positive electrode output member 32, a negative electrode output member 33, and a voltage sensor 34, the positive electrode output member 32, the negative electrode output member 33, and the voltage sensor 34 are all disposed on the insulating support 31, the positive electrode output member 32 and the negative electrode output member 33 are respectively connected with the positive electrode current collector and the negative electrode current collector, and the voltage sensor 34 is connected to the positive electrode current collector and the negative electrode current collector. Voltage sensor 34 is used for the collection of electric core stack body 1's voltage, and positive pole output 32 and negative pole output 33 are as with external equipment's output, and insulating support 31 can play the effect of supporting positive pole output 32, negative pole output 33 and voltage sensor 34, and integrated output pole switching structure 3 has simplified the structure of battery package, and it is more convenient to operate. For the convenience of processing, the positive output member 32, the negative output member 33 and the voltage sensor 34 are formed into the insulating support 31 by injection molding and connected to the insulating support 31.

Preferably, the shell component 2 is provided with an information acquisition point for acquiring information of the battery cell stack 1, wherein the information includes voltage information or temperature information.

The battery pack of this embodiment has solved laminate polymer battery's safety problem, especially thermal runaway safety problem, can promote electric core simultaneously again and organize efficiency in groups, improves energy density, reduces the manufacturing degree of difficulty to reduce material and manufacturing cost. As shown in fig. 9, when the battery pack in the present embodiment is applied to a vehicle, a plurality of battery packs may be directly mounted on a vehicle body floor.

The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.

Claims

1. A battery pack, comprising:

the battery cell stacking body (1) comprises a plurality of battery cells, the battery cells are connected in series or in parallel and stacked along a first direction, the width direction of the battery cells is a second direction, the length direction of the battery cells is a third direction, and the first direction, the second direction and the third direction are mutually perpendicular;

the shell assembly (2) comprises an insulating film (21) and a shell (22), the insulating film (21) wraps the battery cell stacking body (1), the shell (22) wraps the insulating film (21), and a ventilation window (221) is formed in the shell (22).

2. A battery pack according to claim 1, wherein the normal to the plane in which the ventilation window (221) lies is the same as the second direction.

3. The battery pack according to claim 2, wherein the housing (22) is provided with an air vent (222).

4. The battery pack according to claim 2, wherein the casing assembly (2) further comprises an insulating protection plate (23), the insulating protection plate (23) is provided on both sides of the cell stack (1) in the second direction, the insulating protection plate (23) is located between the insulating film (21) and the casing (22), and a heat dissipation grid (231) is provided on the insulating protection plate (23) opposite to the ventilation window (221).

5. The battery pack according to claim 4, wherein the heat dissipation grid (231) of the insulating protection plate (23) is filled with a thermally conductive paste.

6. The battery pack of claim 1, wherein the cells are less than 600mm in length.

7. The battery pack according to claim 1, further comprising a positive current collector and a negative current collector, both of which are connected to the cell stack (1), and both of which are made of aluminum.

8. The battery pack according to claim 7, wherein the positive electrode current collector and the negative electrode current collector are each connected to the cell stack (1) by laser welding.

9. The battery pack of claim 7, further comprising an output electrode adapter structure (3), wherein the output electrode adapter structure (3) comprises an insulating support (31), a positive electrode output member (32), a negative electrode output member (33), and a voltage sensor (34), wherein the positive electrode output member (32), the negative electrode output member (33), and the voltage sensor (34) are disposed on the insulating support (31), the positive electrode output member (32) and the negative electrode output member (33) are respectively connected to the positive electrode current collector and the negative electrode current collector, and the voltage sensor (34) is connected to the positive electrode current collector and the negative electrode current collector.

10. The battery pack according to claim 1, wherein the housing component (2) is provided with an information collecting point for collecting information of the cell stack (1).