CN110854330A

CN110854330A - Exhaust positioning tool, battery module and battery pack

Info

Publication number: CN110854330A
Application number: CN201911178394.9A
Authority: CN
Inventors: 张广平; 周夏荣; 劳力; 周鹏
Original assignee: Sinoelectric Powertrain Corp
Current assignee: Sinoev Hefei Technologies Co Ltd; Sinoelectric Powertrain Corp
Priority date: 2019-11-27
Filing date: 2019-11-27
Publication date: 2020-02-28

Abstract

The embodiment of the application provides an exhaust location frock, battery module and battery package relates to power battery technical field. This exhaust location frock is applied to the battery module including laminate polymer core, exhaust location frock includes a plurality of splint, a plurality of splint set up in laminate polymer core's week side and formation can be supplied the exhaust passage that the gas passes through for when the battery module takes place the thermal runaway, the exhaust passage discharge can be followed to the gas of laminate polymer core release, improves exhaust efficiency, thereby improves the security of battery module.

Description

Exhaust positioning tool, battery module and battery pack

Technical Field

The application relates to the technical field of power batteries, in particular to an exhaust positioning tool, a battery module and a battery pack.

Background

The soft package battery mainly refers to a liquid lithium ion battery with an aluminum plastic film adopted as a shell. Compared with a cylindrical battery and a square battery, under the condition of potential safety hazard, the battery core of the soft package battery can only be blown open, and the explosion is avoided as possible unlike the steel shell and aluminum shell battery core of the cylindrical battery and the square battery. When the safety problem appears in the soft-packaged battery cell in the soft-packaged battery and the failure occurs, the shell of the soft-packaged battery cell expands and cracks due to the generated gas, and the high-temperature gas generated by the battery cell can be diffused into the battery module or even the whole battery pack, so that the safety of the peripheral battery cell and the whole battery pack is threatened.

At present, in order to guarantee laminate polymer battery's safety, can reserve specific exhaust duct in the battery module usually when the battery module design, but because laminate polymer battery takes place when becoming invalid, the shell position of rupture is not fixed, when laminate polymer battery plastic-aluminum membrane position of rupture and exhaust duct distance were far away, the exhaust duct of reserving probably can't reach anticipated exhaust effect, and the high temperature gas of electric core exhaust that became invalid still threatens the safety of electric core, module even whole package around. How to improve the exhaust efficiency when laminate polymer battery is out of control to improve laminate polymer battery's security is the problem that needs to solve urgently.

Disclosure of Invention

In order to overcome at least the above-mentioned shortcoming in the prior art, one of the objectives of the present application is to provide an exhaust positioning tool, a battery module and a battery pack.

In a first aspect, an embodiment provides an exhaust location frock, is applied to the battery module including laminate polymer core, exhaust location frock includes a plurality of splint, a plurality of splint set up in laminate polymer core's week side and form the exhaust passage that can supply the gas to pass through.

In an alternative embodiment, the clamping plates are screwed two by two.

In an optional embodiment, each clamping plate is provided with a connecting hole, and every two clamping plates are in threaded connection through a connecting piece penetrating through the connecting holes of the two clamping plates.

In an alternative embodiment, the connecting member comprises countersunk screws, and two clamping plates are connected through the countersunk screws penetrating through the connecting holes of the two clamping plates.

In an alternative embodiment, the clamping plates are adhesively connected two by two.

In alternative embodiments, the splint is linear or L-shaped in shape.

In an alternative embodiment, the thickness of the interlayer is smaller than the thickness of the soft-package cell.

In a second aspect, an embodiment provides a battery module, including laminate polymer core, air guide groove and the arbitrary one of aforementioned embodiment exhaust location frock, exhaust location frock set up in laminate polymer core week side, the air guide groove is detained and is located the exhaust passage of exhaust location frock, the air guide groove is used for following laminate polymer core escaped gas is derived.

In optional embodiment, the battery module still includes the bubble cotton, the bubble cotton with laminate polymer core interval sets up, the bubble is cotton to be used for completely cutting off the heat that laminate polymer core gived off.

In a third aspect, an embodiment provides a battery pack, which includes a housing, a duct, and the battery module of the foregoing embodiment, where the battery module is accommodated in the housing, the duct passes through the battery module and extends out of the housing, and the duct is used to exhaust gas escaping from the battery module.

Compared with the prior art, the method has the following beneficial effects:

the embodiment of the application provides an exhaust location frock, battery module and battery package, and this exhaust location frock is applied to the battery module including laminate polymer core, exhaust location frock includes a plurality of splint, a plurality of splint set up in laminate polymer core week side and formation can be supplied the exhaust passage that the gas passes through for when the battery module takes place the thermal runaway, the exhaust passage discharge can be followed to the gas of laminate polymer core release, improves exhaust efficiency, thereby improves the security of battery module.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

Fig. 1 is a schematic structural diagram of an exhaust positioning tool provided in an embodiment of the present application.

Fig. 2 is a schematic structural diagram of a soft-package battery cell provided in an embodiment of the present application.

Fig. 3 is a schematic view illustrating an installation manner of an exhaust positioning tool according to an embodiment of the present application.

Fig. 4 is a second schematic view illustrating an installation manner of the exhaust positioning tool according to the embodiment of the present application.

Fig. 5 is a schematic structural diagram of a splint according to an embodiment of the present disclosure.

Fig. 6 is a second schematic structural view of a splint according to the embodiment of the present application.

Fig. 7 is a schematic structural diagram of a battery module according to an embodiment of the present disclosure.

Fig. 8 is a second schematic structural diagram of a battery module according to an embodiment of the present application.

Icon: 100-a battery module; 1-exhausting and positioning a tool; 11-a splint; 110-an exhaust channel; 111-connection hole; 2-soft package battery cell; 20-a cell body; 21-positive plate; 22-negative plate; 23-edge sealing; 3-a gas guide groove; 4-foam cotton.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. 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.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present application, it is further noted that, unless expressly stated or limited otherwise, the terms "disposed," "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 application can be understood in a specific case by those of ordinary skill in the art.

As introduced by the background art, at present, in order to ensure the safety of the soft package battery, a specific exhaust duct is usually reserved in the battery module when the battery module is designed, but because the soft package battery fails, the rupture position of the shell is not fixed, when the rupture position of the aluminum plastic film of the soft package battery is far away from the exhaust duct, the reserved exhaust duct is likely to fail to achieve the expected exhaust effect, and the high-temperature gas discharged by the failed battery cell still threatens the safety of the surrounding battery cell, the module and even the whole package. How to improve the exhaust efficiency when laminate polymer battery is out of control to improve laminate polymer battery's security is the problem that needs to solve urgently.

In view of this, this application embodiment provides an exhaust location frock, uses this exhaust location frock to compress tightly airtightly all around to laminate polymer core to set for the position and set up exhaust passage, when making the battery module take place thermal runaway, laminate polymer core release gaseous can get into exhaust duct through exhaust passage, and then discharge, improves exhaust efficiency, thereby improves the security of battery module. The exhaust positioning tool is explained in detail below.

Referring to fig. 1 and fig. 2 in combination, fig. 1 is a schematic structural diagram of an exhaust positioning tool 1 according to the present application. The application provides an exhaust location frock 1 is applied to the battery module including laminate polymer core 2, exhaust location frock 1 includes a plurality of splint 11, a plurality of splint 11 set up in laminate polymer core 2's week side and form the exhaust passage 110 that can supply the gas to pass through.

Fig. 2 is a schematic structural diagram of a soft-package battery cell 2 provided in an embodiment of the present application. The soft package battery cell 2 comprises a battery cell body 20, a positive plate 21 and a negative plate 22. Positive plate 21 and negative plate 22 are connected respectively to the both ends of electric core body 20, and electric core body 20 skin adopts plastic-aluminum membrane parcel and seals the side of electric core body 20, forms around electric core body 20 week side's banding 23. Because when constituteing the battery module, laminate core 2 is that the stack is placed, takes place thermal runaway in the battery module, when causing laminate core 2 to take place the tympanites, its banding 23 place region breaks easily relatively.

Consequently, the mountable of the exhaust location frock 1 that this application embodiment provided is in soft-packaged electrical core 2, and a plurality of splint 11 of exhaust location frock 1 set up on the banding 23 of soft-packaged electrical core 2 week side, further seal soft-packaged electrical core 2 to reserve out the exhaust passage 110 that can supply the gas to pass through, when making the battery module take place the thermal runaway, the gas of soft-packaged electrical core 2 release is discharged from exhaust passage 110.

Optionally, as an optional implementation manner, please refer to fig. 3 in combination, and fig. 3 is one of schematic installation manners of the exhaust positioning tool 1 provided in the embodiment of the present application. As shown in fig. 3, in this embodiment, the number of the exhaust passages 110 is two, and the two exhaust passages are respectively provided at the middle position of the soft packing core 2.

As another alternative, please refer to fig. 4 in combination, and fig. 4 is a second schematic view illustrating an installation manner of the exhaust positioning tool 1 according to an embodiment of the present application. As shown in fig. 4, in this embodiment, the number of the exhaust passages 110 is two, and the exhaust passages are provided at positions close to the positive electrode tab 21 and the negative electrode tab 22, respectively.

It should be noted that, in the embodiment of the present application, a certain number and positions of the exhaust passages 110 are reasonably reserved according to parameters such as the total electric quantity and the energy density of different battery modules. For example, the number of the exhaust passages 110 may be 1, 2, 3, 4, or the like, and is not limited to the above two embodiments. While the position of the exhaust passage 110 may also be determined as desired. Because positive tab and negative pole ear are stronger with the banding 23 adhesive effect that electric core body 20 is connected, when the battery module thermal runaway, the gas that laminate polymer battery core 2 sent can not expose around positive tab and the negative pole ear. Therefore, in the embodiment of the present application, the clip plate 11 is not provided in the region where the positive electrode tab and the negative electrode tab are located.

This application embodiment compresses tightly airtight through exhaust location frock 1 with laminate polymer battery core 2 all around to set up the gas vent in the particular position, make laminate polymer battery core 2 take place the gas of release when out of control of heat and discharge from exhaust passage 110, improve exhaust efficiency, thereby improve the security of battery module.

Further, as an alternative embodiment, the clamping plates 11 are screwed two by two. Referring to fig. 5, fig. 5 is a schematic structural diagram of a clamping plate 11 according to an embodiment of the present disclosure. Each of the clamping plates 11 is provided with a connecting hole 111, and every two of the clamping plates 11 are connected through a connecting piece penetrating through the connecting holes 111 of the two clamping plates 11 by screw thread.

In the embodiment of the present application, the two clamping plates 11 disposed at the same position and connected by the connecting member through threads have the same size and symmetrical shape. When in actual use, the position of seting up of connecting hole 111 should not exceed the dotted line position shown in the figure, promptly, soft-packaged electrical core 2's border position should not shelter from the connecting hole 111 of seting up on splint 11, guarantees firm in connection between splint 11, improves soft-packaged electrical core 2's leakproofness for when battery module thermal runaway, the gaseous exhaust from predetermined exhaust passage 110 that soft-packaged electrical core 2 sent improves exhaust efficiency.

Alternatively, the connecting member may include countersunk screws, and two of the clamping plates 11 are connected by the countersunk screws passing through the connecting holes 111 of the two clamping plates 11. The connecting hole 111 is a counter bore, and after the countersunk head screw penetrates through the counter bore, the nut part is accommodated in the counter bore, so that the protruding countersunk head screw is prevented from scratching the soft package battery core 2, and therefore potential safety hazards of the battery module are avoided.

As another alternative, the clamping plates 11 are adhesively connected two by two. In order to ensure that the two clamping plates 11 can be firmly bonded when being connected, in the embodiment of the present application, the edge of the clamping plate 11 should reserve a sufficient position with the edge of the soft-package battery core 2. Alternatively, the adhesive may be any adhesive, such as, but not limited to, structural adhesive.

Further, the shape of the splint 11 may be a straight line type or an L-type, which is not limited herein. In the embodiment of the present application, the shape of the splint 11 is L-shaped, and optionally, the shape of the splint 11 may also be linear, as shown in fig. 6, please refer to fig. 6, and fig. 6 is a second schematic structural view of the splint provided by the present application in fig. 6. Be the same with splint 11 for the L type, need reserve the exhaust passage 110 of certain number between splint 11 to when battery module takes place thermal runaway, the gas that laminate polymer electric core 2 gived off is discharged from exhaust passage 110. Other principles and implementations may refer to the above description and are not repeated here.

Further, the thickness of the clamping plate 11 is smaller than that of the soft package battery core 2. In the embodiment of the application, the thickness of every splint 11 all is less than half of the 2 thickness of laminate polymer core, so, on the one hand, the location frock 1 that exhausts can not influence the range of piling up of a plurality of laminate polymer core 2, and on the other hand, when a plurality of laminate polymer core 2 that install the location frock 1 that exhausts overlap and arrange, the whole volume of battery module can not increase because of the location frock 1 that exhausts.

Because the central temperature when the battery module takes place the thermal runaway is great, in order to guarantee the normal use of exhaust location frock 1 when the battery module takes place the thermal runaway, the material of splint 11 in the exhaust location frock 1 needs to adopt fire-retardant material, guarantees the normal work of exhaust location frock 1. Simultaneously, because the weight of battery module should not be too big, consequently, the material that the quality is lighter need be adopted to the splint 11 among the exhaust location frock 1, guarantees that the setting of exhaust location frock 1 can not make battery module's weight great.

Further, the material of the clamping plate 11 is a light and flame retardant material, such as ABS (PC-ABS BLEND), bakelite, mica plate or flame retardant plastic.

Among them, the common ABS alloys include ABS/PC, ABS/PA, ABS/PBT, ABS/PVC, etc. Wherein the ABS/PC is used for improving the flame retardance of the ABS and has good mechanical strength, toughness and flame retardance.

The bakelite is called phenolic plastic in chemical name, and has high mechanical strength, good insulating property, heat resistance and corrosion resistance.

The mica plate is formed by bonding mica paper and organic silicon glue, heating and pressing, has excellent high-temperature-resistant insulating performance, can resist the temperature up to 1000 ℃, and has good cost performance in high-temperature-resistant insulating materials.

The material of the clamping plate 11 may be other lightweight and flame retardant materials, and is not limited herein.

Referring to fig. 7 and 8 in combination, fig. 7 is a schematic structural diagram of a battery module 100 according to an embodiment of the present disclosure. Fig. 8 is a second schematic structural diagram of a battery module 100 according to an embodiment of the present disclosure. The embodiment of the application further provides a battery module 100, including laminate polymer battery core 2, air guide groove 3 and foretell exhaust location frock 1, exhaust location frock 1 set up in laminate polymer battery core 2 week side, air guide groove 3 detains and locates exhaust location frock 1's exhaust passage 110, air guide groove 3 is used for collecting the follow laminate polymer battery core 2 escaped gas.

Further, battery module 100 still includes bubble cotton 4, bubble cotton 4 with the 2 intervals of laminate polymer core set up, bubble cotton 4 is used for completely cutting off the heat that laminate polymer core 2 gived off.

Therefore, on the one hand, the internal temperature of the battery module 100 is protected, low-temperature charge and discharge are facilitated, and the service life is prolonged. On the other hand, the foam 4 can keep the temperature inside the system and reduce the influence of the heat radiation of the high-temperature pavement on the temperature inside the system. When the external part is burnt or has high temperature, the normal temperature in the battery module 100 is kept, the thermal runaway of the battery is delayed, and the safety is improved.

It should be noted that other specific principles and embodiments of the exhaust positioning tool 1 may refer to the above specific explanation of the exhaust positioning tool 1, and are not described herein again.

The embodiment of the present application further provides a battery pack (not shown), which includes a housing and the battery module 100, where the battery module 100 is accommodated in the housing. The duct passes through the battery module 100 and protrudes out of the case, the duct being used to collect gas escaping from the battery module 100. In the embodiment of the application, a port of pipe is close to exhaust passage 110 in the exhaust location frock 1, another port stretches out battery module 100, so, when battery module 100 takes place thermal runaway, discharge in the gas of soft-package electricity core 2 effusion from exhaust passage 110 to discharge to the battery package outside through the pipe, in order to reduce incident's emergence.

Adopt above-mentioned battery module 100 in this application embodiment for the battery package is when taking place thermal runaway, and laminate polymer battery core 2 escaped gaseous can reach the pipe through exhaust passage 110 fast, and outside wrapping through the pipe discharge battery, thereby has guaranteed the security of battery package. It should be noted that other specific principles of the battery module 100 can refer to the above detailed description of the battery module 100, and are not described herein again.

To sum up, this application embodiment provides an exhaust location frock 1, battery module 100 and battery package, and this exhaust location frock 1 is applied to the battery module 100 including laminate polymer core 2, exhaust location frock 1 includes a plurality of splint 11, a plurality of splint 11 set up in laminate polymer core 2 week side and form the exhaust passage 110 that can supply the gas to pass through for when battery module 100 takes place the thermal runaway, the gas of laminate polymer core 2 release is discharged from exhaust passage 110, improves exhaust efficiency, thereby improves battery module 100's security.

The above description is only for various embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present application, and all such changes or substitutions are included in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. The utility model provides an exhaust location frock, its characterized in that is applied to the battery module including laminate core, exhaust location frock includes a plurality of splint, a plurality of splint set up in laminate core's week side and form the exhaust passage that can supply the gas to pass through.

2. The exhaust positioning tool of claim 1, wherein the clamping plates are in threaded connection two by two.

3. The exhaust positioning tool according to claim 2, wherein each clamping plate is provided with a connecting hole, and every two clamping plates are in threaded connection through a connecting piece penetrating through the connecting holes in the two clamping plates.

4. The exhaust positioning tool of claim 3, wherein the connecting piece comprises countersunk screws, and every two clamping plates are connected through the countersunk screws penetrating through the connecting holes in the two clamping plates.

5. The exhaust positioning tool of claim 1, wherein the clamping plates are bonded two by two.

6. The exhaust positioning tool according to any one of claims 1 to 5, wherein the clamping plate is linear or L-shaped.

7. The exhaust positioning tool of any one of claims 1 to 5, wherein the thickness of the clamping plate is smaller than that of the soft package cell.

8. The utility model provides a battery module, its characterized in that includes laminate polymer core, air guide groove and claim 1-7 arbitrary one the exhaust location frock, exhaust location frock set up in laminate polymer core week side, the air guide groove is detained and is located the exhaust passage of exhaust location frock, the air guide groove is used for following laminate polymer core escaped gas is derived.

9. The battery module of claim 8, further comprising foam, wherein the foam is spaced apart from the pouch and is used for isolating heat emitted from the pouch.

10. A battery pack comprising a case, a duct for discharging gas escaped from the battery module, and the battery module according to claim 8 or 9, the battery module being accommodated in the case, the duct passing through the battery module and protruding out of the case.