CN212783632U - Shell structure and battery package on battery package - Google Patents
Shell structure and battery package on battery package Download PDFInfo
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- CN212783632U CN212783632U CN202021722287.6U CN202021722287U CN212783632U CN 212783632 U CN212783632 U CN 212783632U CN 202021722287 U CN202021722287 U CN 202021722287U CN 212783632 U CN212783632 U CN 212783632U
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- upper case
- battery pack
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model belongs to the field of power batteries, and discloses a battery pack upper shell structure and a battery pack, wherein the battery pack upper shell structure comprises an upper shell with a flexible layer structure, at least one low-pressure balance valve and at least one high-pressure explosion-proof valve; and the low-pressure balance valve and the high-pressure explosion-proof valve are both communicated with the upper shell and are arranged on the wall surface of the upper shell. The utility model discloses an improve its structural strength of material reinforcing of casing, increase flexible bearing structure to add the low pressure balanced valve, can keep inside and outside pressure balance throughout normal during operation, can make inside high pressure descend fast in the short time when taking place the thermal runaway, the structural deformation of going up the casing is controllable, can not take place to break, thereby can not appear naked light at the casing outside in guaranteeing the thermal runaway state within 5 minutes, improves the security.
Description
Technical Field
The utility model belongs to the power battery field specifically, relates to a shell structure and battery package on battery package.
Background
At present, in order to improve the energy density of a power battery, a battery core chemical system with high energy density such as 811 is generally adopted. However, such high energy density cells generate a large amount of explosion energy in a very short time in the event of thermal runaway within the battery pack. The structural strength of the shell is low on traditional Sheet Molding Compound (SMC) and the plastic material, the toughness is poor, the explosion-proof valve can not discharge the explosive energy in a very short time, the cracking of the shell in a short time is serious, open fire can be directly sprayed out from the cracking, the safety requirement that no open fire exists inside and outside 5 minutes of thermal runaway can not be met, and huge potential safety hazards exist.
In addition, the complex upper shell structure is difficult to be formed by metal plates and aluminum alloy, and the cost of the die is high.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a shell structure on battery package, its structural strength of material reinforcing through improving the upper housing increases flexible bearing structure to add the low pressure balanced valve, can keep inside and outside pressure balance throughout normal work, can make inside high pressure descend fast in the short time when taking place the thermal runaway, the structural deformation of upper housing is controllable, can not take place to break, thereby can not appear naked light in the upper housing outside in 5 minutes under the assurance thermal runaway state, the security improves.
In order to achieve the above object, in a first aspect, the present invention provides a battery pack upper casing structure, including an upper casing having a flexible layer structure, at least one low-pressure balance valve and at least one high-pressure explosion-proof valve; and the low-pressure balance valve and the high-pressure explosion-proof valve are both communicated with the upper shell and are arranged on the wall surface of the upper shell.
Further, the upper shell is a continuous glass fiber composite material upper shell or a carbon fiber composite material upper shell.
The flexible support structures are arranged in the upper shell at intervals and connected with the top wall of the upper shell to structurally support the upper shell; the height of each flexible support structure is adapted to vary with the height of the interior cavity of the upper housing.
Further, each of the flexible support structures is arranged along a lengthwise axis of the upper housing.
Further, the flexible supporting structure is a simple beam, and the simple beam penetrates through the top wall of the upper shell through a bolt and is connected to the upper shell.
Further, a sealing ring is arranged between the simply supported beam and the inner wall surface of the top wall of the upper shell, and the sealing ring surrounds the mounting hole of the bolt.
Further, a rigidity adjusting gasket is arranged between the bolt and the upper shell.
Furthermore, the area size of the rigidity adjusting gasket is adjustable.
Furthermore, the number of the low-pressure balance valves is M, wherein M is an even number, and each low-pressure balance valve is arranged on two side walls of the upper shell in the length direction; the high-pressure explosion-proof valves are N, N is an even number, and each high-pressure explosion-proof valve is arranged on two side walls of the upper shell in the length direction; m is more than or equal to N.
In a second aspect, the present invention provides a power battery pack, which comprises any one of the above technical solutions.
The utility model discloses an improve its structural strength of material reinforcing of casing, increase flexible bearing structure to add the low pressure balanced valve, can keep inside and outside pressure balance throughout normal during operation, can make inside high pressure descend fast in the short time when taking place the thermal runaway, the structural deformation of going up the casing is controllable, can not take place to break, thereby can not appear naked light at the casing outside in guaranteeing the thermal runaway state within 5 minutes, improves the security.
Other features and advantages of the present invention will be described in detail in the detailed description which follows.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of a housing structure of a battery pack according to the present invention;
fig. 2 is a schematic structural diagram of an upper case in an embodiment of the upper case structure of the battery pack of the present invention;
fig. 3 is an exploded view of the flexible support structure connected to the upper case in one embodiment of the upper case structure of the battery pack of the present invention.
In the figure, an upper case 1; a bolt mounting hole 11; a low pressure balance valve mounting hole 12; a side wall 13; a flexible support structure 2; a low pressure balance valve 3; a high-pressure explosion-proof valve 4; a seal ring 5; a rigidity adjusting shim 6; and a bolt 7.
Detailed Description
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings. It is to be understood that the description of the embodiments herein is for purposes of illustration and explanation only and is not intended to limit the invention.
It should be noted that, in the following description of the technical solutions of the present invention, the orientation or positional relationship indicated by the directional terms is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of the present invention, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
As shown in fig. 1, an embodiment of the upper casing structure of the battery pack of the present invention includes an upper casing 1 having a flexible layer structure, at least one low-pressure balance valve 3 and at least one high-pressure explosion-proof valve 4; the low-pressure balance valve 3 and the high-pressure explosion-proof valve 4 are both communicated with the upper shell 1 and are installed on the wall surface of the upper shell. Preferably, the upper shell 1 is a continuous glass fiber composite upper shell or a carbon fiber composite upper shell. Based on the FiberSIM layering method, the continuous glass fiber composite material or the carbon fiber composite material is molded by adopting PCM (Prepreg Compression Molding) or RTM (Resin Transfer Molding). The two molding processes can mold a very complex upper shell structure, and solve the problems of difficult molding of metal plates or aluminum alloys and high mold cost. Go up casing 1 through above-mentioned material and technology formation has complicated multilayer stack structure, and structural strength is high, is difficult for the fracture when meeting thermal runaway, and fire behavior is good, can effectively restrain and prevent the inside thermal runaway of battery package and outwards extend, can take place the time that the back does not have the naked light to leak with thermal runaway and prolong to more than 5 minutes, strived for sufficient time of fleing for the passenger, and the security is very improved.
As shown in fig. 1 and 2, a low pressure balance valve mounting hole 12 is formed in the upper casing 1, and the low pressure balance valve 3 is fixed to a side wall 13 of the upper casing 1 by bolts after passing through the low pressure balance valve mounting hole 12. The low-pressure balance valve 3 is of a spring type structure, and the balance pressure is about 3.5-5 Kpa. When the battery pack is in a normal working state, if the internal and external pressure difference is greater than the set pressure of the low-pressure balance valve 3, the spring of the low-pressure balance valve 13 is compressed, so that the low-pressure balance valve 13 is automatically opened, if the internal and external pressure difference is less than the set pressure of the low-pressure balance valve 13, the low-pressure balance valve 13 is automatically closed, the internal and external pressure difference of the battery pack can be adjusted, when the internal pressure is greater than the external pressure, the internal gas can be released to the outside, and a ventilation effect is achieved, so that the problem that the internal and external pressure difference is too large due to the change of the internal and external environments in the normal working state of the battery pack can be solved, the upper shell 1 does not need to bear redundant pressure, the durability of the structure of the upper shell.
The high-pressure explosion-proof valve 4 is connected with the upper shell 1 through a bolt, the high-pressure explosion-proof valve 4 is of a thimble + thin film type structure, and the pressure is generally set to be about 12-20 Kpa. When the battery core in the battery pack is out of control due to heat, the instantaneous pressure in the battery pack is increased to 30-50Kpa, the ventilation quantity of the low-pressure balance valve 3 is small, and a large amount of gas cannot be exhausted instantaneously. When the pressure reaches the set value of the high-pressure explosion-proof valve 4, the ejector pin starts to work to puncture the film, a large amount of gas is exhausted instantly, the pressure in the upper shell 1 is released, and potential safety hazards to passengers due to direct discharge of open fire caused by overpressure rupture of the upper shell 1 are effectively prevented. The high-pressure explosion-proof valve 4 is quickly opened by the ejector pin, so that the effect of large discharge capacity and quick pressure relief is achieved, the internal pressure of the battery pack is quickly reduced, and the internal pressure is ensured to be controlled in a bearable interval of the upper shell 1. Through the cooperation of two kinds of high low pressure valves use, can realize that the internal pressure when battery package thermal runaway descends fast to guarantee that upper casing 1 does not break, satisfy the security performance that national standard 5 minutes did not have naked light and longer time, strive for sufficient time to flee for the passenger.
As shown in fig. 1 and fig. 3, in an embodiment of the upper case structure of the battery pack of the present invention, the upper case structure of the battery pack further includes a plurality of flexible supporting structures 2, and each of the flexible supporting structures 2 is disposed inside the upper case 1 at intervals and connected to the top wall thereof to structurally support the upper case; the height of each of the flexible support structures 2 is adapted to vary as a function of the height of the interior cavity of the upper shell 1. Preferably, each of the flexible support structures 2 is arranged along a longitudinal axis of the upper housing 1. Go up casing 1 itself and spread the layer structure for the flexibility, certain elasticity has, a plurality of flexible bearing structure 2 intervals are connected with the roof of last casing 1, under the thermal runaway condition, inside instantaneous high pressure effect makes it have the cracked tendency of outside dilatational strain on the roof of last casing 1, flexible bearing structure 2 exerts reaction force to this kind of outside dilatational strain's tendency this moment, can effectively slow down deflection and the shake frequency of last casing 1 under the instantaneous action force circumstances such as vibration and impact, avoid going up the fracture of casing 1. The number of flexible support structures 2 can be increased or decreased according to the length of upper shell 1, and the specific number is determined according to the effective and comprehensive support of the top wall of upper shell 1. The height of flexible support structure 2 can be increased and decreased along with the size of last 1 inner chamber height of casing, and the profile of going up the roof of casing 1 probably is the height uneven, and then its inner chamber height also is not of uniform size, can install the height that flexible support structure 2 was highly confirmed to the inner chamber of casing 1 in the position department of flexible support structure 2 as required to guarantee that the two height is equivalent, can make the connection between the two laminate more like this, improves and prevents the deformation effect. Each flexible support structure 2 is arranged along the length direction axis of the upper shell 1, namely the flexible support structure 2 is supported at the central part of the upper shell 1, so that the acting force of the flexible support structure 2 on the upper shell 1 is more uniform, the acting surface is larger, and the deformation preventing effect can be improved to the utmost extent.
As shown in fig. 3, in an embodiment of the battery pack upper shell structure of the present invention, the flexible supporting structure 2 is a simple beam, and the simple beam is connected to the upper shell 1 through a bolt 7. Preferably, a sealing ring 5 is arranged between the simply supported beam and the inner wall surface of the top wall of the upper shell 1, and the sealing ring 5 surrounds the mounting hole 11 of the bolt 7. The simply supported beam is simple in structure and convenient to install. Sealing washer 5 can adopt circle shape structure, and sealing washer 5 encloses bolt mounting hole 11, and the intercommunication between the gap of isolated bolt mounting hole 11 department and the upper casing 1 inside can effectively seal upper casing 1, prevents inside outside water and the dust entering battery package.
As shown in fig. 1 and 3, in an embodiment of the upper case structure of the battery pack of the present invention, a rigidity adjusting gasket 6 is disposed between the bolt 7 and the upper case 1. Preferably, the area size of the rigidity adjusting shim 6 is adjustable. The rigidity adjusting gasket 6 has a certain surface area, and is tightly attached to the outer surface of the top wall of the upper shell 1, so that on one hand, the sealing of the bolt mounting hole 11 can be enhanced, on the other hand, the structure of the part attached to the upper shell 1 can be enhanced, and the structural rigidity of the attached part on the upper shell 1 is improved. The area of the attaching part can be correspondingly increased by increasing the area of the rigidity adjusting gasket 6, the area of the larger part of the upper shell 1 is subjected to rigidity improvement, and the local cracking of the upper shell 1 can be effectively prevented.
In an embodiment of the upper casing structure of the battery pack of the present invention, the number of the low pressure balance valves 3 is M, M is an even number, and each of the low pressure balance valves 3 is respectively disposed on two side walls 13 of the upper casing 1 in the length direction; the number of the high-pressure explosion-proof valves 4 is N, N is an even number, and each high-pressure explosion-proof valve 4 is arranged on two side walls 13 of the upper shell 1 in the length direction; m is more than or equal to N. As shown in fig. 1, M is 6, N is 2, that is, on two side walls 13 in the length direction of the upper housing 1, there are 3 low-pressure balancing valves 3 and 1 high-pressure explosion-proof valve 4 on each side wall 13. When thermal runaway takes place, two kinds of valves that inside high pressure can follow two lateral walls departments are let out simultaneously, improve the pressure release speed, shorten the pressure-bearing time of casing 1, further improve the security.
The utility model discloses power battery wraps's embodiment, including above-mentioned battery package on the provided battery package of the arbitrary embodiment of shell structure goes up shell structure, must have the above-mentioned battery package on the technological effect that any embodiment of shell structure had.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited thereto. In the technical idea scope of the present invention, it is possible to provide the technical solution of the present invention with a plurality of simple modifications, including combining each specific technical feature in any suitable manner, and in order to avoid unnecessary repetition, the present invention does not provide additional description for various possible combinations. These simple variations and combinations should also be considered as disclosed in the present invention, all falling within the scope of protection of the present invention.
Claims (10)
1. The upper shell structure of the battery pack is characterized by comprising an upper shell (1) with a flexible layering structure, at least one low-pressure balance valve (3) and at least one high-pressure explosion-proof valve (4); the low-pressure balance valve (3) and the high-pressure explosion-proof valve (4) are both communicated with the upper shell (1) and are arranged on the wall surface of the upper shell.
2. The battery pack upper case structure according to claim 1, wherein the upper case (1) is a continuous glass fiber composite upper case or a carbon fiber composite upper case.
3. The battery pack upper case structure according to claim 1, further comprising a plurality of flexible support structures (2), wherein each of the flexible support structures (2) is disposed at intervals inside the upper case (1) and connected to a top wall thereof for structurally supporting the upper case; the height of each flexible support structure (2) is adapted to vary with the height of the inner cavity of the upper housing (1).
4. A battery pack upper case structure according to claim 3, wherein each of the flexible support structures (2) is arranged along a length direction axis of the upper case (1).
5. The battery pack upper case structure according to claim 3, wherein the flexible support structure (2) is a simple beam connected to the upper case (1) through the top wall of the upper case (1) by a bolt (7).
6. The battery pack upper case structure according to claim 5, wherein a seal ring (5) is provided between the simply supported beam and an inner wall surface of a top wall of the upper case (1), and the seal ring (5) surrounds the mounting hole (11) of the bolt (7).
7. The battery pack upper case structure according to claim 5, wherein a rigidity adjusting spacer (6) is provided between the bolt (7) and the upper case (1).
8. The battery pack upper case structure according to claim 7, wherein the area size of the rigidity adjustment gasket (6) is adjustable.
9. The battery pack upper case structure according to claim 1, wherein the number of the low pressure balance valves (3) is M, M being an even number, and each of the low pressure balance valves (3) is provided on both side walls (13) in a length direction of the upper case (1); the number of the high-pressure explosion-proof valves (4) is N, the N is an even number, and each high-pressure explosion-proof valve (4) is arranged on two side walls (13) of the upper shell (1) in the length direction; m is more than or equal to N.
10. A power battery pack comprising the battery pack upper case structure according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021722287.6U CN212783632U (en) | 2020-08-17 | 2020-08-17 | Shell structure and battery package on battery package |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021722287.6U CN212783632U (en) | 2020-08-17 | 2020-08-17 | Shell structure and battery package on battery package |
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| Publication Number | Publication Date |
|---|---|
| CN212783632U true CN212783632U (en) | 2021-03-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021722287.6U Active CN212783632U (en) | 2020-08-17 | 2020-08-17 | Shell structure and battery package on battery package |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113879090A (en) * | 2021-09-27 | 2022-01-04 | 金娇荣 | Chassis system on new energy automobile |
| EP4155115A1 (en) * | 2021-09-24 | 2023-03-29 | Toyota Jidosha Kabushiki Kaisha | Battery pack |
-
2020
- 2020-08-17 CN CN202021722287.6U patent/CN212783632U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4155115A1 (en) * | 2021-09-24 | 2023-03-29 | Toyota Jidosha Kabushiki Kaisha | Battery pack |
| CN113879090A (en) * | 2021-09-27 | 2022-01-04 | 金娇荣 | Chassis system on new energy automobile |
| CN113879090B (en) * | 2021-09-27 | 2023-02-03 | 金娇荣 | Chassis system on new energy automobile |
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