WO2023165579A1

WO2023165579A1 - Cell assembly and battery device

Info

Publication number: WO2023165579A1
Application number: PCT/CN2023/079423
Authority: WO
Inventors: 潘福中; 郑松太; 李慧明; 王旭东; 牛亚琪
Original assignee: 浙江极氪智能科技有限公司; 威睿电动汽车技术(宁波)有限公司; 浙江吉利控股集团有限公司
Priority date: 2022-03-03
Filing date: 2023-03-02
Publication date: 2023-09-07
Also published as: CN114497825B; CN114497825A

Abstract

Disclosed in the present application are a cell assembly and a battery device. The cell assembly comprises: cells, wherein each cell has an electrode post, and at least two cells are provided; a connecting member, which is connected between the electrode posts of the two cells; and a heat dissipation structure, which is connected to the connecting member.

Description

Cell Assemblies and Battery Units

related application

This application claims the priority of the Chinese patent application with application number 202210208264.0 filed on March 3, 2022.

technical field

The present application relates to the technical field of battery devices, in particular to a battery cell assembly and a battery device.

Background technique

A battery pack, such as a battery pack configured on a new energy vehicle, is usually composed of several battery modules, and the battery module is composed of several battery cells. The connecting piece is fixed on the pole of the battery cell and used for To form a series or parallel relationship between different battery cells. When the current value of charging and discharging of the battery pack is large, the temperature rise of the connecting piece is high, and the heat will be transferred to the inside of the battery cell, thereby affecting the working performance and life of the battery cell.

Contents of the invention

The main purpose of the present application is to provide a battery cell assembly, which aims to improve the heat dissipation efficiency of the connecting piece through the heat dissipation structure, so as to avoid the problem that its temperature rise is too high and affect the performance of the battery cell.

In order to achieve the above purpose, the cell assembly proposed by this application includes:

The electric core has poles, and the electric core is provided with at least two poles;

a connector, connected between the poles of the two electric cores; and

The heat dissipation structure is connected to the connector.

In one embodiment, the heat dissipation structure includes a heat dissipation element, the heat dissipation element includes a body section and an extension section, and there are a plurality of electric cores, and the bottom surfaces of the plurality of electric cores are arranged on the body section, so The body section is used for heat exchange with the electric core; the extension section exceeds the side of the electric core and is used for heat exchange with the connecting piece.

In one embodiment, the heat dissipation structure further includes a heat conduction structure, and the heat conduction structure is sandwiched between Between the connecting piece and the heat sink.

In one embodiment, the material of the heat conduction structure is configured as an insulating material.

In one embodiment, the heat conduction structure is configured as a heat conduction element made of elastic material; or, the heat conduction structure is configured as heat conduction glue or heat conduction silicone grease filled between the connection element and the heat dissipation element.

In one embodiment, the connector includes a connecting plate and an abutting flange, the connecting plate is connected to the poles of the two battery cells, and the abutting flange is formed by the connecting plate close to the The side edge of the heat sink is folded and leans against the heat conducting structure.

In one embodiment, at least two of the battery cells are distributed along the first direction, and a pre-stretching rib is provided in the middle of the connecting plate, and the extending direction of the pre-stretching rib intersects the first direction and is located at Between the pole posts of the two electric cores, the cross-sectional shape of the pre-extended ribs is curved or bent.

In one embodiment, the connecting plate and the abutting flange are integrally stamped and formed.

In one embodiment, the abutment flanging is provided with a relief opening corresponding to the pre-extension rib, and the connecting plate is provided with an escape gap communicating with the relief opening, and the pre-extension rib is connected to the edge of the avoidance gap.

In one embodiment, there are multiple connecting pieces, and the connecting pieces are distributed at intervals along the first direction, and the heat conducting structure extends along the first direction and is connected to at least two connecting pieces.

In one embodiment, the connection plate covers the pole arrangement.

In one embodiment, the connecting plate is welded and fixed to the pole.

In one embodiment, the cooling element is provided with a refrigerant channel, and the refrigerant channel is used for circulation of the refrigerant.

The present application also proposes a battery device, including the aforementioned battery cell assembly.

The technical solution of the present application can dissipate the heat of the connecting piece in time through the heat dissipation structure, that is, improve the heat dissipation efficiency of the connecting piece, thereby avoiding the excessive temperature rise of the connecting piece, especially in the case of high current charging and discharging. It leads to the problem that the performance of the battery cell is degraded, and it is beneficial to improve the service life of the battery cell. It is easy to understand that if the connector only exchanges heat with the air, the heat dissipation efficiency will be too low and the temperature will rise rapidly. However, the heat dissipation efficiency of the connector connected to the heat dissipation structure can be improved by using a specially designed heat dissipation structure.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to the structures shown in these drawings without creative effort.

Fig. 1 is a schematic structural view of an embodiment of the cell assembly of the present application;

Fig. 2 is a partial enlarged view of the cell assembly at A in Fig. 1;

FIG. 3 is a schematic structural view of another embodiment of the cell assembly of the present application;

FIG. 4 is a schematic structural view of another embodiment of the cell assembly of the present application;

FIG. 5 is a schematic structural diagram of another embodiment of the cell assembly of the present application.

Explanation of reference numbers:

The realization, functional features and advantages of the present application will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

It should be noted that if there are directional indications (such as up, down, left, right, front, back...), the directional indication is only used to explain the relative positional relationship, movement, etc. Then the directional indication changes accordingly.

In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only for descriptive purposes, and cannot be interpreted as indications or hints Its relative importance or implicitly indicates the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In addition, the meaning of "and/or" appearing in the whole text includes three parallel schemes, taking "A and/or B" as an example, including scheme A, scheme B, or schemes that both A and B satisfy. In addition, the technical solutions of the various embodiments can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist , nor within the scope of protection required by the present application.

In view of this, the application proposes a cell assembly, referring to Figures 1 and 2, in an embodiment of the application, the cell assembly includes:

The electric core 10 has poles 11, and the electric core 10 is provided with at least two;

The connecting piece 20 is connected between the poles 11 of the two electric cores 10; and

The heat dissipation structure 30 is connected to the connector 20 .

The technical solution of the present application can dissipate the heat of the connector 20 in a timely manner through the heat dissipation structure 30, that is, improve the heat dissipation efficiency of the connector, thereby avoiding the excessive temperature rise of the connector 20, especially in the case of high-current charging and discharging. If the value is too high, the performance of the single battery cell 10 will be reduced, and it is beneficial to improve the service life of the battery cell 10 . It is easy to understand that if the connector 20 only exchanges heat with the air, the heat dissipation efficiency will be too low and the temperature will rise rapidly. However, the heat dissipation of the connector 20 connected to the heat dissipation structure 30 can be improved by using the specially arranged heat dissipation structure 30. efficiency.

1 and 2, in one embodiment, the heat dissipation structure 30 includes a heat dissipation element 31, the heat dissipation element 31 Including the body section 311 and the extension section 312, there are multiple battery cells 10, and the multiple battery cells are distributed along the first direction. The battery cells have adjacent bottom surfaces and side surfaces, and the plane where the bottom surface is located is parallel to the first direction. The plane where it is located is arranged in parallel with the first direction, and the bottom surfaces of the plurality of battery cells 10 are all set on the body section 311, and the body section 311 is used for heat exchange with the battery cells 10; the extension section 312 exceeds the side of the battery cell 10 and is used for Heat exchange with the connector 20 . It should be noted that the bottom surface of the battery cell 10 does not specifically refer to the lower side in the vertical direction, but can be either the upper side or the lower side. For example, please refer to FIG. 2 , in this embodiment, the heat sink 31 is located on the lower side of the battery cell 10 ; It can be understood that when the battery pack is working, the battery cell 10 is the main heat source, so heat dissipation measures need to be specially provided for the battery cell 10 . In this embodiment, the heat sink 31 is mainly used to dissipate heat from the battery cell 10, and then use the local structure (extension section 312) of the heat sink 31 to exchange heat with the connector 20, thereby improving the integration of the heat dissipation structure 30 , simplifying the structure of the heat dissipation structure 30 , and further avoiding a significant increase in the overall weight and volume of the battery pack on the premise of improving the heat dissipation efficiency of the connector 20 . It can be understood that the battery pack arranged on the new energy vehicle is extremely sensitive to its own weight and volume, so the technical solution of this embodiment is simple in structure and will not significantly increase the volume and weight of the battery pack, and has a relatively large Market Advantage. Specifically, the heat exchange between the connecting piece 20 and the extension section 312 may be that the connecting piece 20 directly contacts the extension section 312 and conducts heat conduction, or the connecting piece 20 passes through other media, such as heat-conducting silicone grease or a heat-conducting piece, It is in indirect contact with the extension section 312 and conducts heat conduction. It should be noted that when there are multiple connectors 20, in the embodiment where the connectors 20 are in direct contact with the extension section 312, the material defining the extension section 312 is configured as a thermally conductive insulating material, which can prevent the connection between the multiple connectors 20. An electrical connection is made between them through the extension segment 312 .

In this embodiment, the heat dissipation structure 30 further includes a heat conduction structure 32 , and the heat conduction structure 32 is interposed between the connecting member 20 and the heat dissipation member 31 . In this way, the heat on the connector 20 can be transferred to the heat sink 31 in time through the heat conduction structure 32 , and then the heat is dissipated by the heat sink 31 with a larger surface area, thereby further improving the heat dissipation efficiency of the connector 20 .

In an embodiment, the material of the heat conduction structure 32 is configured as an insulating material. Specifically, for example, the heat conduction structure 32 is configured as a heat conduction element made of elastic material, such as a heat conduction silicone element, or an insulating heat conduction foam pad, and the like. In this way, firstly, by limiting the material of the heat conduction structure 32 to an insulating material, it is possible to prevent electrical connection between the plurality of connectors 20 through the heat conduction structure 32 , thereby ensuring the normal operation of the battery pack. Secondly, since the heat conduction structure 32 has elasticity, it is possible to preset the assembly between the connecting piece 20 and the heat conduction structure 32 The amount of interference is to digest the dimensional tolerance and assembly tolerance, so as to ensure that a plurality of different connectors 20 can actually abut on the heat conduction structure 32, that is, to avoid the situation that some connectors 20 are separated from the heat conduction structure 32, so as to ensure Effectiveness of the heat conduction path from the connection part 20 to the heat dissipation part 31 through the heat conduction structure 32 . However, the present design is not limited thereto. In other embodiments, the heat conduction structure may also be configured as heat conduction glue or heat conduction silicone grease filled between the connector and the heat sink.

Please refer to FIGS. 1 and 2. In one embodiment, the connector 20 includes a connecting plate 21 and an abutting flange 22. The connecting plate 21 is connected to the poles 11 of the two electric cores 10. The abutting flange 22 is formed by the connecting plate. The side edge of 21 close to the heat sink 31 is folded and leans against the heat conducting structure 32 . In this way, the abutment flange 22 not only enhances the structural strength of the connector 20 itself, but also increases the contact area between the connector 20 and the heat conduction structure 32 , which is beneficial to improve the heat conduction effect. Certainly, in other embodiments, the connecting member may also be configured as a connecting plate, and the side edge of the connecting plate directly abuts against the heat conducting structure, or the side edge of the connecting plate is inserted into the heat conducting structure.

Please refer to Fig. 4, in another embodiment of the battery cell assembly of the present application, there are two heat dissipation structures 30, and the two heat dissipation structures are respectively located on the upper and lower sides of the battery cell 10, and are arranged oppositely, so that the heat dissipation structure can be further improved. The heat dissipation efficiency of the battery cell 10 and the connector 20 . It can be understood that two abutting flanges 22 are provided correspondingly, and are respectively connected to the upper and lower sides of the connecting plate 21 , that is, the cross-sectional shape of the connecting member 20 along the vertical direction is U-shaped.

Please refer to Figures 1 and 2, in one embodiment, at least two battery cells 10 are distributed along the first direction, and the middle part of the connecting plate 21 is provided with a pre-stretching rib 211, and the extension direction of the pre-stretching rib 211 is intersected with the first direction. , and located between the poles 11 of the two electric cores 10, the cross-sectional shape of the pre-extended ribs 211 is curved or bent. In this way, when the cell 10 expands and the distance between the poles 11 on two adjacent cells 10 changes, the pre-extended ribs 211 can be elongated accordingly to adapt to the change in the distance, that is, the connector 20 It can still maintain an effective connection with the pole 11 and work normally. Of course, referring to FIG. 5 , in another embodiment of the cell assembly of the present application, the connecting plate 21 may not be provided with pre-stretching ribs 211 , that is, the connecting member 20 is configured as an L-shaped bracket with a simple structure.

In this embodiment, the connecting plate 21 and the abutting flange 22 are integrally stamped and formed. In this way, the manufacturing cost of the connecting member 20 can be reduced, and the connection strength between the abutting flange 22 and the connecting plate 21 can be enhanced, so as to ensure that the abutting flange 22 can be more attached to the heat conducting structure 32 . Certainly, in other embodiments, the connecting part may also be formed by casting or forging process, or formed by extrusion process, for example, the connecting part is formed by extruded graphene plate and the like.

In this embodiment, the abutment flange 22 is provided with a relief opening 22a corresponding to the pre-extension rib 211, and the connecting plate 21 is provided with an escape gap 21a communicating with the escape opening 22a, and the pre-extension rib 211 is connected to the escape gap 21a. edge. In this way, by making an avoidance structure corresponding to the pre-extended rib 211 (including the escape opening 22a and the avoidance notch 21a), it is convenient to ensure the yield rate of the stamping forming of the abutment flange 22, and to ensure the quality consistency of different connectors 20 products, thereby ensuring The abutting flanges 22 on the plurality of connectors 20 can fit well on the heat conducting structure 32 . Of course, in the embodiment of the cast connector, the structure of the relief opening and the relief notch may not be provided.

Please refer to FIGS. 1 and 2. In one embodiment, there are multiple connectors 20, the plurality of connectors 20 are spaced along the first direction, and the heat conduction structure 32 extends along the first direction and is connected to at least two connectors 20. . In this way, the connection with multiple connectors 20 is realized through one heat conduction structure 32, which can not only simplify the assembly steps, thereby improving the assembly efficiency of the battery pack, but also make it easier to ensure that different connectors 20 are effectively connected to the heat conduction structures 32, that is, , to ensure the consistency of assembly quality. Of course, in other embodiments, it is also possible that each connecting piece is correspondingly provided with an independent heat conducting structure, or that two ends abutting against the flange are respectively provided with an independent heat conducting structure.

Referring to FIGS. 1 and 2 , in an embodiment, the connecting plate 21 is arranged to cover the pole 11 . In this way, by making the cross-sectional area of the connecting plate 21 as large as possible, its current conduction performance can be improved, thereby reducing its resistance, and improving the problems of heat generation and temperature rise during operation. Certainly, in other embodiments, it is also possible that the connecting plate covers part of the pole arrangement.

In one embodiment, the connecting plate 21 is welded and fixed on the pole 11 . In this way, fixing by welding can improve the connection strength between the connection plate 21 and the pole 11, ensure the stability and reliability of the connection between the two, and the installation process is simple and easy to operate, which is conducive to improving the reliability of the battery pack. Productivity. Of course, in other embodiments, the connecting plate can also be installed on the battery core through a screw locking or clamping structure, and abut against the pole.

In one embodiment, the cooling element 31 is provided with a refrigerant channel, and the refrigerant channel is used for circulating the refrigerant. In this way, the heat dissipation element 31 can rapidly exchange heat between the battery cell 10 and the connecting piece 20 through liquid cooling, thereby improving the overall heat dissipation efficiency of the battery cell 10 assembly. Specifically, in this embodiment, the refrigerant is configured as a mixture of water and alcohol. Of course, in other embodiments, the heat sink 31 may not be provided with a refrigerant channel, but a paint with good heat radiation performance may be coated on the surface; the refrigerant may also be water, or a fluorinated liquid, and the like.

The present application also proposes a battery device, including the aforementioned cell assembly, and the specific details of the cell assembly Referring to the above embodiments for structure, since this battery device adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, and will not be repeated here.

The above are only optional embodiments of the present application, and are not intended to limit the patent scope of the present application. Under the inventive concept of the present application, the equivalent structural transformations made by using the description of the application and the contents of the accompanying drawings, or direct/indirect Applications in other relevant technical fields are included in the patent protection scope of the present application.

Claims

A battery pack, comprising:

The electric core has poles, and the electric core is provided with at least two poles;

a connector, connected between the poles of the two electric cores; and

The heat dissipation structure is connected to the connector.
The electric core assembly according to claim 1, wherein the heat dissipation structure includes a heat dissipation element, the heat dissipation element includes a body section and an extension section, there are a plurality of the electric cores, and the bottom surfaces of the plurality of electric cores are arranged As for the body section, the body section is used for heat exchange with the electric core; the extension section is beyond the side of the electric core and is used for heat exchange with the connecting piece.
The battery cell assembly according to claim 2, wherein the heat dissipation structure further comprises a heat conduction structure, and the heat conduction structure is interposed between the connecting piece and the heat dissipation piece.
The battery cell assembly according to claim 3, wherein the material of the heat conducting structure is configured as an insulating material;

And/or, the heat conduction structure is configured as a heat conduction element made of elastic material; or, the heat conduction structure is configured as heat conduction glue or heat conduction silicone grease filled between the connection element and the heat dissipation element.
The cell assembly according to claim 3, wherein the connecting member comprises a connecting plate and an abutting flange, the connecting plate is connected to the pole posts of the two electric cells, and the abutting flange is formed by the abutting flange. The side edge of the connecting plate close to the heat sink is folded and leans against the heat conducting structure.
The battery cell assembly according to claim 5, wherein at least two of the battery cells are distributed along a first direction, and a pre-stretching rib is provided in the middle of the connecting plate, and the extension direction of the pre-stretching rib is the same as that of the first The directions are intersecting, and are located between the poles of the two electric cores, and the cross-sectional shape of the pre-stretching ribs is bent or bent.
The cell assembly according to claim 6, wherein the connecting plate and the abutting flange body stamping setup;

And/or, the abutment flange is provided with a relief opening corresponding to the pre-extension rib, and the connecting plate is provided with a relief gap communicating with the relief opening, and the pre-extension rib is connected to the relief opening. edge of the notch.
The cell assembly according to claim 6, wherein a plurality of connecting parts are provided, and the plurality of connecting parts are distributed along the first direction at intervals, and the heat conducting structure extends along the first direction and is connected to at least one The two connectors are connected.
The cell assembly according to claim 5, wherein the connecting plate covers the pole arrangement;

And/or, the connecting plate is welded and fixed on the pole.
A battery device, comprising the cell assembly according to any one of claims 1-9.