CN210379351U

CN210379351U - Battery core and battery module

Info

Publication number: CN210379351U
Application number: CN201921724681.0U
Authority: CN
Inventors: 吴雪林; 李静
Original assignee: Evergrande New Energy Vehicle Technology Guangdong Co Ltd
Current assignee: Hengda hengchi new energy automobile technology (Guangdong) Co., Ltd
Priority date: 2019-10-15
Filing date: 2019-10-15
Publication date: 2020-04-21
Anticipated expiration: 2029-10-15

Abstract

The application discloses electric core and battery module. The battery cell comprises a battery cell shell, an insulating cover plate, a battery cell shell end cover and two tab assemblies with opposite electric properties; the insulating cover plate is made of a heat-conducting insulating material and is in heat-conducting fit with the electric core shell end cover; the tab assembly comprises a tab and a tab seat, the tab seat is in heat conduction fit with the insulating cover plate, and the tab penetrates through the insulating cover plate and the electric core shell end cover and reaches the outside. The battery module comprises a module shell, a busbar, an insulating end cover, a front end cover and a plurality of battery cores; the battery cores are regularly arranged; the insulating end cover comprises an end cover body and a heat conduction insulating piece, wherein the end cover body is provided with a heat conduction hollowed-out part, and the heat conduction hollowed-out part is internally and fixedly provided with the heat conduction insulating piece; one side of the heat conduction insulating piece is in heat conduction connection with the confluence part or the lug, and the other side of the heat conduction insulating piece is in heat conduction connection with the front end cover; the heat-conducting insulating part is made of a heat-conducting insulating material. The electric core and the battery module provided by the embodiment can improve the problems of overhigh temperature of the electric core and uneven temperature distribution.

Description

Battery core and battery module

Technical Field

The application relates to the technical field of electric energy storage, especially, relate to an electricity core and battery module.

Background

With the increasing concern of society on environmental and energy problems, clean renewable energy becomes the key point of sustainable development. The traditional automobile is gradually replaced by an electric automobile due to the problems of high oil consumption, tail gas pollution and the like.

Currently, electric vehicles generally store electric energy as energy through power battery modules. A lithium ion battery module is one of the battery module types that is widely used. The battery module generally comprises a plurality of electric cores, and in the inside of every electric core, it needs to be insulating between utmost point ear and the electric core casing, and at electric core outside, the utmost point ear of a plurality of electric cores passes through the busbar and connects, and the busbar also needs to be insulating with the module casing, and current solution generally can add the plastics insulation board between utmost point ear and electric core casing, between busbar and the module casing.

However, the common insulating materials used in the prior art generally have the dual characteristics of insulation and heat insulation, and also block heat transmission while insulating. And utmost point ear can produce a large amount of heats at the during operation, because the existence of these insulation system, lead to on the heat on the utmost point ear is hardly conducted electric core shell and module shell fast, consequently the heat can gather near utmost point ear, lead to electric core high temperature and temperature distribution uneven, and the rerum natura difference between the different electric cores of accumulation along with time will be more obvious to influence the life-span of module.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides an electric core and a battery module to solve the problems.

The embodiment of the application adopts the following technical scheme:

in a first aspect, an embodiment of the present application provides a battery cell, including a battery cell casing, an insulating cover plate, a battery cell casing end cap, and two tab assemblies with opposite electrical properties;

the battery core shell is enclosed into a battery core cavity and an opening end communicated with the battery core cavity, and the battery core shell end cover is made of a heat-conducting material and is hermetically connected with the opening end;

the insulating cover plate is made of a heat-conducting insulating material, is positioned in the electric core cavity and is in heat-conducting fit with the electric core shell end cover;

every utmost point ear subassembly all includes fixed connection's utmost point ear and utmost point ear seat, utmost point ear seat in the electricity core intracavity and with insulating cover plate heat conduction laminating, utmost point ear runs through in proper order insulating cover plate and electricity core shell end cover arrives in the external world, utmost point ear with insulating cover plate sealing connection, utmost point ear with electricity core shell end cover is insulating each other.

Optionally, in the above-mentioned electric core, the battery further includes an insulating pad, the insulating pad is made of a heat-conducting insulating material, the insulating pad is attached to one side of the electric core shell end cover, which is away from the insulating cover plate, in a heat-conducting manner, and the tab penetrates through the insulating pad and is connected to the insulating pad in a heat-conducting manner.

Optionally, in the above-mentioned electric core, the battery further includes an insulating sealing sleeve, the insulating sealing sleeve is sleeved on the tabs and extends to the insulating cover plate and between the tabs and in the gaps between the tabs, the tabs and the insulating cover plate are connected in a sealing manner through the insulating sealing sleeve, and the tabs and the battery case end cover are isolated and separated through the insulating sealing sleeve.

Optionally, in the battery cell, the heat conducting and insulating material is heat conducting and insulating ceramic.

Optionally, in the battery cell, the heat conducting insulating ceramic is aluminum nitride heat conducting insulating ceramic.

In a second aspect, an embodiment of the present application provides a battery module, which includes a module housing, a busbar, an insulating end cap, a front end cap, and a plurality of battery cells;

the module shell is enclosed into a battery cell cavity and a module opening communicated with the battery cell cavity, and all the battery cells are regularly arranged in the battery cell cavity;

the busbar is provided with a confluence part and two electric connecting terminals, and the tabs of all the battery cells are electrically connected with the confluence part so that all the battery cells form an integral power circuit with the two electric connecting terminals as positive and negative electrodes;

the insulating end cover seals the module opening, the insulating end cover comprises an end cover body and a heat conduction insulating piece, the end cover body is arranged on one side, away from the battery core, of the busbar, a heat conduction hollowed-out part is formed in the position, corresponding to the lug, of the end cover body, and the heat conduction insulating piece is fixedly arranged in the heat conduction hollowed-out part;

the front end cover is arranged on one side, away from the bus bar, of the insulating end cover, one side of the heat conduction insulating piece is in heat conduction connection with the bus part or the lug, and the other side of the heat conduction insulating piece is in heat conduction connection with the front end cover;

the heat-conducting insulating piece is made of a heat-conducting insulating material.

Optionally, in the above battery module, the bus portion corresponds to each tab and is provided with a bus hole, the tab penetrates through the bus hole and is electrically connected to the peripheral surface of the bus hole, and one side of the heat-conducting insulating member is connected to the tab in a heat-conducting manner.

Optionally, in the above battery module, the heat conducting insulator covers a side surface of the tab facing away from the tab seat.

Optionally, in the battery module, both ends of the heat-conducting insulating member are extended from the heat-conducting hollow-out portion.

Optionally, in the battery module, the heat conducting and insulating material is heat conducting and insulating ceramic.

Optionally, in the battery module, the heat conductive insulating ceramic is aluminum nitride heat conductive insulating ceramic.

Optionally, in the battery module, an outer contour of the heat conducting insulating member is a regular polygon.

Optionally, in the battery module, the front end cover includes a heat conducting portion and a heat dissipating fin, the heat conducting portion is connected to the heat dissipating fin in a heat conducting manner, and the heat conducting portion is attached to the heat conducting insulating member in a heat conducting manner.

The embodiment of the application adopts at least one technical scheme which can achieve the following beneficial effects:

the electric core and the battery module that this application embodiment discloses can make the inside heat of electric core transmit away through utmost point ear subassembly fast when guaranteeing insulating properties, prevent near gathering of heat utmost point ear subassembly, effectively improve the problem that electric core high temperature and temperature distribution are uneven, show promotion battery module life-span.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1 is an overall structural view of a battery cell disclosed in an embodiment of the present application;

fig. 2 is an exploded view of a cell disclosed in an embodiment of the present application;

fig. 3 is a side sectional view of a battery cell disclosed in an embodiment of the present application;

FIG. 4 is an enlarged partial structural view of the area A in FIG. 3;

fig. 5 is an overall structural view of a battery module disclosed in an embodiment of the present application;

fig. 6 is an exploded structural view of a battery module disclosed in an embodiment of the present application.

Description of reference numerals:

1-battery core, 10-battery core shell, 100-battery core cavity, 101-opening end, 11-insulating cover plate, 12-battery core shell end cover, 13-tab component, 130-tab, 131-tab seat, 14-insulating sealing sleeve, 15-insulating pad, 16-battery core body, 17-welding plate, 2-module shell, 20-battery cavity, 21-module opening, 22-baffle edge, 3-busbar, 30-busbar, 300-busbar hole, 31-electric connecting terminal, 4-insulating end cover, 40-end cover body, 400-heat conduction hollowed-out part, 41-heat conduction insulating part, 5-front end cover, 50-heat conduction part, 51-heat dissipation fin and 6-rear cover.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.

The embodiment of the application discloses a battery cell 1, as shown in fig. 1 to 4, including a battery cell casing 10, an insulating cover plate 11, a battery cell casing end cover 12, and two tab assemblies 13 with opposite electrical properties. The cell casing 10 itself is usually made of aluminum or other materials, and has good thermal conductivity. The cell casing 10 encloses a cell cavity 100 and an open end 101 connecting the cell cavity 100, the cell cavity 100 is used for placing an electrical core 16 (shown in fig. 3 and 4), the electrical core is usually wrapped by an aluminum plastic film, and two electrode plates are extended from one side for electrically connecting with the tab assembly 13. The core housing end cap 12 may be made of a common heat conductive material, such as metal with good heat conductivity, for example, aluminum, copper, etc., and the core housing end cap 12 is hermetically connected to the open end 101, and may also transmit heat from the core housing end cap 12 to the core housing 10.

In this embodiment, the material of the insulating cover plate 11 is different from the material such as the ordinary engineering plastics that usually adopts among the prior art, and the insulating cover plate that the material such as ordinary engineering plastics was made possesses good insulating properties, but also possesses stronger thermal-insulated ability simultaneously, and heat conduction efficiency is low, leads to the heat of utmost point ear can't transmit away fast. The insulating cover plate 11 in this embodiment is made of a heat conducting and insulating material, which has good heat conducting performance and excellent heat conducting performance, and can quickly transfer heat while maintaining the insulating effect, so that it is possible to quickly transfer heat at the tab.

In this embodiment, the insulating cover plate 11 is located in the electrical core cavity 100 and is attached to the electrical core shell end cap 12 in a heat conducting manner, and a large area of contact area exists between the insulating cover plate and the electrical core shell end cap, so as to improve the heat conducting rate. Meanwhile, each tab assembly 13 includes a tab 130 and a tab seat 131 fixedly connected to each other, wherein the tab 130 and the tab seat 131 may be separate assemblies or may be integrally formed components. The tab seat 131 is located in the core cavity 100 and is attached to the insulating cover plate 11 in a heat conducting manner, i.e., a large area of contact area also exists between the tab seat 131 and the insulating cover plate 11. The tab 130 sequentially penetrates through the insulating cover plate 11 and the electric core shell end cover 12 and reaches the outside, and when penetrating, the tab 130 and the insulating cover plate 11 are ensured to be connected in a sealing manner, and meanwhile, the tab 130 and the electric core shell end cover 12 are mutually insulated.

In the embodiment of the present application, ensuring the sealing connection between the tab 130 and the insulating cover plate 11 and the mutual insulation between the tab 130 and the core housing end cap 12 are particularly important to ensure the safety of the electrical core 1. To ensure the sealing connection between the tab 130 and the insulating cover plate 11, it is generally necessary to seal the tab 130 and the insulating cover plate 11 by direct interference, or to seal a gap between the two by providing an elastic sealing member. And the mode of ensuring the mutual insulation of the tab 130 and the electric core shell end cover 12 can form an annular gap between the tab 130 and the electric core shell end cover 12, or an insulating part is arranged in the gap between the tab 130 and the electric core shell end cover 12 for insulation and separation.

In a preferred scheme, the electric core 1 of this embodiment may include an insulating sealing sleeve 14 inside, the insulating sealing sleeve 14 is sleeved on the tab 130, and the insulating sealing sleeve 14 extends to gaps between the insulating cover plate 11 and the tab 130 and between the electric core shell end cover 12 and the tab 130, because of the insulating and sealing characteristics of the insulating sealing sleeve 14 itself, the tab 130 and the insulating cover plate 11 may be hermetically connected through the insulating sealing sleeve 14, and because of the insulating barrier of the insulating sealing sleeve 14, the tab 130 and the electric core shell end cover 12 also easily form an insulating matching structure.

The electric core 1 that this embodiment provided can pass through utmost point ear seat 131, insulating apron 11 fast transfer to electric core shell end cover 12 and electric core shell 10 with utmost point ear subassembly 13's heat when guaranteeing two utmost point ear subassembly 13 mutual insulation through above-mentioned structure, prevents near the gathering of heat at utmost point ear subassembly 13, effectively improves the problem that electric core 1 high temperature and temperature distribution are uneven.

In this embodiment, in order to further derive the heat of utmost point ear subassembly 13 fast, can add insulating pad 15 on electric core 1, heat conduction insulating material is also chooseed for use to insulating pad 15's material to, with insulating pad 15 and the heat conduction laminating of one side that electric core shell end cover 12 deviates from insulating apron 11, utmost point ear 130 then runs through insulating pad 15 simultaneously and is connected with insulating pad 15 heat conduction. In this way, heat from the tab assembly 13 can be transferred through the tab 130 to the insulation pad 15 and then through the insulation pad 15 to the core shell end cap 12. That is, the tab assembly 13 can transfer heat to the electric core shell end cap 12 through two heat conduction paths, so that the heat conduction efficiency is higher.

In this embodiment, in order to prevent the insulating pad 15 from falling off, a welding plate 17 may be further sleeved on the tab 130, and the welding plate 17 presses the insulating pad 15 and is fixed with the tab 130 by welding or other methods, so as to form a firm connection structure and prevent the insulating pad 15 from falling off the tab 130.

As shown in fig. 5 and fig. 6, an embodiment of the present application further provides a battery module, which has a plurality of battery cells 1 provided in the foregoing embodiments, and in addition, the battery module further includes a module housing 2, a bus bar 3, an insulating end cap 4, a front end cap 5, and a rear end cap 6.

Module shell 2 and back lid 6 enclose into battery cavity 20 and the module opening 21 that communicates battery cavity 20, and all electric cores 1 are regularly arranged in battery cavity 20, and utmost point ear 130 is towards module opening 21. It should be noted that the battery cavity 20 does not need to form a sealing or closing structure, as long as a plurality of battery cells 1 can be limited within a space. For example, the battery cavity 20 is shown as having large openings in the top and bottom, but has a rib 22 at the edge to limit the separation of the battery cell 1. Similar to the cell casing 10, the module housing 2 is also a good conductor of heat, facilitating rapid heat transfer to the outside of the battery module. Also, the battery cell 1 may transfer heat by contact with the module case 2 when arranged within the battery cavity 20. That is, the heat that has been previously transferred to the cell casing 10 by the tab assembly 13 of the battery cell 1 may be directly transferred to the outside of the battery module through the module case 2.

The bus bar 3 includes a bus portion 30 and two electric connection terminals 31, the tabs 130 of all the battery cells 1 are electrically connected to the bus portion 30, and the bus bar 3 can form an overall power supply circuit in which the two electric connection terminals 31 serve as positive and negative electrodes for all the battery cells 1, and in this overall power supply circuit, the battery cells 1 may be connected in series, in parallel, or in a more complicated circuit connection system having both series and parallel connections.

The insulating end cap 4 closes the module opening 21, and the insulating end cap 4 in the present embodiment includes an end cap body 40 and a heat conductive insulator 41. The end cover body 40 is disposed on a side of the bus bar 3 departing from the electric core 1, and the end cover body 40 is made of a common material, such as an insulating plastic. A heat conducting hollow-out portion 400 is disposed on the end cap body 40 corresponding to the tab 130, and the heat conducting insulating member 41 is fixedly disposed in the heat conducting hollow-out portion 400. The material of the heat conducting insulating member 41 in this embodiment is different from that of the end cap body 40, and the heat conducting insulating member 41 is made of a heat conducting insulating material as the insulating cover plate 11 and the insulating pad 14 inside the electric core 1, so that the heat conducting insulating member 41 also has good insulating performance and heat conducting performance.

The front end cover 5 is arranged on one side of the insulating end cover 4, which is away from the busbar 3, one side of the heat-conducting insulating member 41 is in heat-conducting connection with the busbar portion 30 or the tab 130, and the other side of the heat-conducting insulating member 41 is in heat-conducting connection with the front end cover 5. In this way, the heat of the tab 130 can be transferred to the heat conductive insulator 41 directly or through the bus bar 30, and then transferred from the heat conductive insulator 41 to the front end cap 5. The front end cover 5 may include a heat conducting portion 50 and heat dissipating fins 51, the heat conducting portion 50 is connected to the heat dissipating fins 51 in a heat conducting manner, and is also attached to the heat conducting insulating member 41 in a heat conducting manner, so that heat can be dissipated from the front end cover 5 to the environment quickly.

In the battery module shown in fig. 5 and 6, a plurality of battery cells 1 are stacked in the vertical direction, and two tab assemblies 13 on each battery cell 1 are respectively located at two ends of the battery cell casing end cover 12, and a large gap is formed between the two tab assemblies. The heat conducting portion 50 may be two heat conducting fins extending in the vertical direction, each heat conducting fin is sequentially attached to all the heat conducting insulating members 41 on the side where the heat conducting portion is located, and the heat dissipating fins 51 are disposed between the two heat conducting fins.

Whether the heat conductive insulator 41 is connected to the bus bar 30 or the tab 130 in a heat conductive manner depends mainly on the connection structure of the bus bar 30 and the tab 130. The heat conductive insulator 41 may be directly thermally connected to the tab 130 if the bus bar 30 can expose the tab 130, and the heat conductive insulator 41 may be indirectly connected to the tab 130 through the bus bar 30 if the bus bar 30 completely covers the tab 130.

Compared with the way that the heat-conducting insulator 41 is indirectly connected with the tab 130 through the bus portion 30, the way that the heat-conducting insulator 41 is directly connected with the tab 130 in a heat-conducting manner is undoubtedly more efficient in heat conduction. Therefore, the bus bar 30 of the present embodiment may be provided with a bus bar hole 300 corresponding to each tab 130, the tab 130 penetrates the bus bar hole 300 and is electrically connected to the peripheral surface of the bus bar hole 300, the tab 130 may be exposed through the bus bar hole 300, and one side of the heat-conducting insulator 41 may be directly connected to the tab 130 in a heat-conducting manner.

In various embodiments of the present application, the insulating cover plate 11, the insulating pad 14 and the heat conducting insulator 41 may be made of the same heat conducting and insulating material. Different heat conducting and insulating materials can also be respectively adopted. The current ideal heat-conducting insulating material is heat-conducting insulating ceramic, wherein the heat-conducting insulating effect of the aluminum nitride heat-conducting insulating ceramic is excellent.

In this embodiment, the insulating end cap 4 is not made of a heat conducting and insulating material entirely, because the bus bar 3 and the insulating end cap 4 have complicated structures, the heat conducting and insulating material, especially the heat conducting and insulating ceramic, is difficult to form entirely, and the cost is extremely high. Moreover, since the heat is concentrated at the tab 130, the heat is not much in other areas of the busbar 3, so that the rapid heat dissipation can be realized as long as the rapid heat transfer from the tab 130 to the front end cover 5 is ensured. For the reasons mentioned above, the embodiment of the present application can satisfy the heat conduction requirement only by disposing the heat conducting insulating member 41 at the position corresponding to the tab 130, and at the same time, the manufacturing cost can be reduced.

In order to further improve the heat conduction efficiency, the heat conduction insulator 41 in this embodiment preferably covers a surface of the tab 130 on a side away from the tab seat 131, so as to make full use of the end surface of the tab 130 for heat conduction. In addition, in order to make the heat conductive insulator 41 closely adhere to the tab 130 and the front end cap 5 for heat conduction, both ends of the heat conductive insulator 41 may be extended by the heat conductive hollow 400, and the heat conductive insulator 41 may directly abut against the tab 130 and the front end cap 5 during assembly, thereby forming a stable heat transfer surface.

In the present embodiment, the thermal conductive insulator 41 may be fixed in the thermal conductive hollow 400 in an inlaid manner, that is, the thermal conductive insulator 41 adopts a columnar or sheet-like structure (in terms of actual size, usually sheet-like structure) and is embedded in the thermal conductive hollow 400. Theoretically, the heat-conducting hollow-out portion 400 and the heat-conducting insulator 41 can be fixed together by fitting only if the two are matched in contour shape. In consideration of the processing difficulty and scrap rate of the heat conductive insulator 41, the heat conductive insulator 41 preferably has a regular polygonal outer contour rather than a circular shape.

To sum up, the battery core and the battery module that this embodiment provided can effectively improve the too high and uneven problem of temperature distribution of electric core temperature, are showing and are promoting battery module life-span.

In the embodiments of the present application, the difference between the embodiments is described in detail, and different optimization features between the embodiments can be combined to form a better embodiment as long as the differences are not contradictory, and further description is omitted here in view of brevity of the text.

The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A battery cell is characterized by comprising a battery cell shell, an insulating cover plate, a battery cell shell end cover and two tab assemblies with opposite electric properties;

2. The battery cell of claim 1, further comprising an insulating pad, wherein the insulating pad is made of a heat conducting and insulating material, the insulating pad is attached to one side of the battery cell casing end cover, which is away from the insulating cover plate, in a heat conducting manner, and the tab penetrates through the insulating pad and is connected to the insulating pad in a heat conducting manner.

3. The electric core of claim 1 or 2, further comprising an insulating sealing sleeve, wherein the insulating sealing sleeve is sleeved on the tabs and extends to gaps between the insulating cover plate and the tabs and between the electric core shell end caps and the tabs, the tabs are connected with the insulating cover plate in a sealing manner through the insulating sealing sleeve, and the tabs are isolated from the electric core shell end caps in an insulating manner through the insulating sealing sleeve.

4. The cell of claim 1 or 2, wherein the thermally conductive and insulating material is a thermally conductive and insulating ceramic.

5. The electrical core of claim 4, wherein the thermally conductive and insulating ceramic is an aluminum nitride thermally conductive and insulating ceramic.

6. A battery module comprising a module housing, a buss bar, an insulating end cap, a front end cap, and a plurality of the cells of any of claims 1-5;

the module shell is enclosed into a battery cavity and a module opening communicated with the battery cavity, and all the battery cores are regularly arranged in the battery cavity;

7. The battery module according to claim 6, wherein the bus bar part is provided with a bus bar hole corresponding to each tab, the tab penetrates into the bus bar hole and is electrically connected with the peripheral surface of the bus bar hole, and one side of the heat-conducting insulator is connected with the tab in a heat-conducting manner.

8. The battery module according to claim 7, wherein the thermally conductive insulator covers a surface of the tab on a side facing away from the tab seat.

9. The battery module according to any one of claims 6 to 8, wherein both ends of the heat conductive insulating member are protruded by the heat conductive hollowing part.

10. The battery module according to any one of claims 6 to 8, wherein the thermally conductive and insulating material is a thermally conductive and insulating ceramic.

11. The battery module according to claim 10, wherein the thermally conductive and insulating ceramic is an aluminum nitride thermally conductive and insulating ceramic.

12. The battery module according to any one of claims 6 to 8, wherein the outer profile of the thermally conductive and insulating member is a regular polygon.

13. The battery module according to any one of claims 6 to 8, wherein the front end cap comprises a heat conducting portion and a heat dissipating fin, the heat conducting portion is in heat conducting connection with the heat dissipating fin, and the heat conducting portion is in heat conducting fit with the heat conducting insulating member.