WO2023181751A1 - Battery pack pressure release structure - Google Patents

Battery pack pressure release structure Download PDF

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Publication number
WO2023181751A1
WO2023181751A1 PCT/JP2023/006139 JP2023006139W WO2023181751A1 WO 2023181751 A1 WO2023181751 A1 WO 2023181751A1 JP 2023006139 W JP2023006139 W JP 2023006139W WO 2023181751 A1 WO2023181751 A1 WO 2023181751A1
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Prior art keywords
upper case
pressure release
shield plate
heat shield
battery pack
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PCT/JP2023/006139
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French (fr)
Japanese (ja)
Inventor
啓介 道高
信義 鈴木
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三菱自動車工業株式会社
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Priority to JP2023544427A priority Critical patent/JPWO2023181751A1/ja
Publication of WO2023181751A1 publication Critical patent/WO2023181751A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625—Vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/658—Means for temperature control structurally associated with the cells by thermal insulation or shielding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
    • H01M50/236—Hardness
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/342—Non-re-sealable arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/35—Gas exhaust passages comprising elongated, tortuous or labyrinth-shaped exhaust passages

Definitions

  • This invention relates to a pressure release structure for a battery pack.
  • Vehicles with battery packs that use high-capacity, high-energy-density lithium-ion batteries to improve acceleration performance and extend cruising range of electric vehicles such as electric vehicles and plug-in hybrid vehicles that can be recharged or supplied with external power. It is required to be installed in On the other hand, when adopting lithium-ion batteries, higher levels of safety are required, including additional legal requirements regarding ensuring the safety of passengers in the event that the lithium-ion batteries develop abnormalities such as heat generation. .
  • an opening 12 is formed in the pack case upper 5 of the battery pack 1, and a gap adjustment plate is formed so as to cover this opening 12.
  • This gap adjusting plate 13 is attached to the wall 5A of the pack case upper 5 by a fixture 14. During normal use, the gap adjusting plate 13 is close to the edge of the opening 12, and the opening 12 is substantially closed.
  • the pressure inside the pack case 2 increases, the pack case 2 tries to expand outward and is deformed into a curve, creating a gap ⁇ L between the wall 5A and the gap adjustment plate 13.
  • the high pressure gas inside the pack case 2 is discharged to the outside through this gap ⁇ L (see paragraphs 0014 to 0023, FIGS. 1 to 5, etc. of Patent Document 1).
  • an object of the present invention is to quickly release the internal pressure of a battery pack when the internal pressure of the battery pack increases due to an abnormality in the battery module.
  • a discharge port is formed in the battery module to release the internal pressure when the internal pressure increases, and the battery module is configured to guide gas released from the discharge port from the discharge port toward the pressure release section. It is preferable to have a gas guiding part.
  • the gas guide portion is provided on a surface of the upper case facing the sealed space.
  • a heat shield plate for suppressing heat transfer from the battery module to the upper case is partially provided on a surface of the upper case facing the sealed space, and the rigidity of the upper case is such that the heat shield plate It is preferable that the height is high in the areas where the height is provided, and it is low in the areas where it is not provided.
  • the heat shield plate and the gas guide portion are configured as one member, and a heat insulating space is formed between the upper case and the heat shield plate to suppress heat transfer from the battery module to the upper case. It is preferable that
  • the stiffness of the upper case differs depending on the part, and the pressure release part is formed in a part where the stiffness is relatively low compared to other parts, so that if the battery module malfunctions, the battery pack When the internal pressure of the upper case increases, the upper case deforms greatly and can quickly release the internal pressure.
  • FIG. 2 is a cross-sectional view showing the pressure release structure of the battery pack shown in FIG. 1, in which (a) is a state in which internal pressure is not applied, and (b) is a state in which internal pressure is applied.
  • FIG. 3 is a cross-sectional view showing the pressure release structure of a battery pack shown as a reference, in which (a) shows a state in which no internal pressure is applied, and (b) shows a state in which internal pressure acts.
  • a sectional view of essential parts of a second embodiment of the pressure release structure of a battery pack according to the present invention A sectional view of a main part of a third embodiment of a pressure release structure for a battery pack according to the present invention
  • this pressure release structure includes a lower case 1 and an upper case 2 provided so as to cover the lower case 1.
  • FIGS. 1 to 3 A sealed space in which a battery module 3 is housed is formed between the lower case 1 and the upper case 2.
  • the lower case 1 is a tray-shaped member that opens upward, and is adapted to accommodate a plurality of battery modules 3. Although its material is not particularly limited, in this embodiment it is made of a metal plate.
  • the battery modules 3 are composed of lithium ion batteries, and each battery module 3 is placed vertically (with its long side in the direction along the front and rear of the vehicle).
  • a discharge port 4 is formed on the top surface of the battery module 3 to release the internal pressure when the internal pressure of the battery module 3 increases.
  • this embodiment shows eight rectangular parallelepiped battery modules 3 placed vertically, this is merely an example, and the orientation, shape, size, number, type of batteries, etc. of the battery modules 3 may be changed as appropriate. Is possible.
  • the upper case 2 is a member that has almost the same shape as the lower case 1 in plan view.
  • the material of the upper case 2 is not particularly limited, it is made of a metal plate in this embodiment.
  • Two pressure release portions 5 are formed on the upper surface of the upper case 2 to release the internal pressure in the sealed space formed by the lower case 1 and the upper case 2 when the internal pressure increases.
  • the pressure release portion 5 may be a valve that is closed when the internal pressure of the closed space is below a predetermined value and opens when the internal pressure exceeds a predetermined value.
  • a heat shield plate 6 is provided on the back surface of the upper case 2 facing the closed space to suppress heat transfer from the battery module 3 housed in the closed space to the upper case 2.
  • its material is not particularly limited, in this embodiment it is made of a metal plate.
  • the heat shield plate 6 is fixed to the back surface of the upper case 2 by spot welds 7.
  • This heat shield plate 6 is provided not on the entire back surface of the upper case 2 but on a portion thereof. That is, in this embodiment, two heat shield plates 6 are provided with a gap in the front-rear direction of the vehicle. The size of this gap is slightly larger than the size of the pressure release part 5 formed in the upper case 2.
  • the rigidity of the upper case 2 can be made different such that the rigidity of the upper case 2 is high in the part where the heat shield plate 6 is provided and low in the part where the heat shield plate 6 is not provided. It's set.
  • the pressure release portion 5 is formed in a portion of the upper case 2 that has low rigidity.
  • the front heat shield plate 6 will be referred to as a front heat shield plate 6a
  • the rear heat shield plate 6 will be referred to as a rear heat shield plate 6b.
  • a plurality of gas guide portions 8 extending in the front-rear direction and protruding downward are formed on the lower surfaces of the front heat shield plate 6a and the rear heat shield plate 6b.
  • the lower end of the gas guide section 8 faces the upper surface of the battery module 3.
  • the rear end side of the gas guide part 8 formed on the front heat shield plate 6a and the front end side of the gas guide part 8 formed on the rear heat shield plate 6b are formed on the upper case 2. It is bent toward the pressure release part 5.
  • two gas guide portions 8 are formed for each battery module 3 housed in a sealed space, and an exhaust port is formed in the battery module 3 between the two gas guide portions 8. 4 is located. That is, when gas is discharged from the discharge port 4 as the internal pressure of the battery module 3 increases, the gas is discharged by the upper surface of the battery module 3, the lower surface of the heat shield plate 6, and the two gas guide portions 8. It is guided to the pressure release part 5 using the enclosed gap g as a main passage.
  • the upper case 2 is configured such that the rigidity is high in the region where the heat shield plate 6 is provided and low in the region where it is not provided, and the pressure release portion 5 is formed in the region with low rigidity. The points are the same.
  • the heat shield plate 6 is fixed to the back surface of the upper case 2 using the spot welding part 7, but the fixing means is determined by taking into consideration the materials and shapes of the upper case 2 and the heat shield plate 6. , for example, can be modified as appropriate, such as fixing with screws.
  • a heat shield plate 6 is partially provided on the back surface of the upper case 2, and the rigidity of the upper case 2 is high at the portion where the heat shield plate 6 is provided.
  • gas is discharged from the discharge port 4 formed in the battery module 3 due to an abnormality in the battery module 3.
  • the internal pressure of the battery pack increases.
  • gas is released from the pressure release part 5 while deforming so that the periphery of the pressure release part 5, which has relatively low rigidity, is at the top.
  • the shape after deformation (deformation mode) is controlled so that the upper case 2 deforms greatly when the internal pressure of the battery pack increases. This allows the internal pressure to be released quickly.
  • the rigidity of the upper case 10 is The height increases over almost the entire area, including the area around the exposed area.
  • the upper case 10 itself will be damaged due to its high rigidity, as shown in FIG. 5(b), for example. It tries to displace upward without deforming too much. Therefore, the internal pressure of the battery pack remains trapped, which is undesirable.
  • FIG. 1 A second embodiment of the pressure release structure according to the present invention is shown in FIG.
  • the pressure release structure according to the second embodiment is basically the same as the structure according to the first embodiment, but the heat shield plate 6 and the gas guide part 8 are composed of one member, and the upper case 2 and the The difference is that a heat insulating space a (air layer) that suppresses heat transfer from the battery module 3 to the upper case 2 is formed between the heat plate 6 and the heat plate 6 .
  • the heat shield plate 6 and the gas guide portion 8 are formed by bending a single metal plate.
  • the gas is surrounded by the upper surface of the battery module 3, the lower surface of the heat shield plate 6, and the two gas guide portions 8. It is guided to the pressure release part 5 (see FIG. 1 etc.) using the gap g as the main passage.
  • the rigidity of the upper case 2 is high in the vicinity of the gas guide section 8, and is low in the region away from the gas guide section 8. . Therefore, similarly to the first embodiment, the shape after deformation (deformation mode) of the upper case 2 can be controlled so that the upper case 2 is greatly deformed when the internal pressure of the battery pack increases, and the internal pressure can be quickly reduced. Can be opened.
  • the heat insulating space a is formed between the upper case 2 and the heat shield plate 6, even if the battery module 3 generates heat, the heat is not easily transmitted to the upper case 2. Do not overheat. Therefore, it is possible to prevent abnormalities caused by heat from occurring in the coating film or the like formed on the upper surface of the upper case 2.
  • the thickness of the heat insulating space a can be determined as appropriate as long as the heat transfer from the battery module 3 to the upper case 2 can be suppressed to a predetermined value or less.
  • FIG. 1 A third embodiment of the pressure release structure according to the present invention is shown in FIG.
  • the pressure release structure according to the third embodiment is different from the structure of the first embodiment in that the gas guide portion 8 is directly formed on the back surface of the upper case 2.
  • the gas guide portion 8 is directly formed on the back surface of the upper case 2.
  • the gas guide portion 8 also acts as a reinforcing rib that reinforces the upper case 2, and the rigidity of the upper case 2 is high in the portion where the gas guide portion 8 is formed, and in the portion where the gas guide portion 8 is not formed. It's getting lower.
  • a pressure release portion 5 is formed in a portion where the gas guide portion 8 is not formed. Therefore, similarly to each of the above embodiments, the shape after deformation (deformation mode) of the upper case 2 can be controlled so that the upper case 2 is greatly deformed when the internal pressure of the battery pack increases, and the internal pressure can be quickly reduced. can be opened to
  • FIG. 1 A fourth embodiment of the pressure release structure according to the present invention is shown in FIG.
  • the pressure release structure according to the fourth embodiment differs from the structure of the first embodiment in that a thick portion 9 is formed in a part of the upper case 2, which is thicker than other parts.
  • the pressure release portion 5 is formed in a portion other than the thick wall portion 9.
  • the material of this upper case 2 is not particularly limited, but it may be made of resin or the like whose thickness can be easily changed depending on the part. Further, the thick portion 9 can be formed at a desired location by a processing method such as die casting.
  • the shape after deformation (deformation mode) of the upper case 2 can be controlled so that the upper case 2 is greatly deformed when the internal pressure of the battery pack increases, and the internal pressure can be quickly reduced. can be opened to

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Battery Mounting, Suspending (AREA)
  • Gas Exhaust Devices For Batteries (AREA)

Abstract

This battery pack pressure release structure includes a lower case (1), and an upper case (2) which is provided so as to cover the lower case (1) and which forms a sealed space for accommodating a battery module (3) between the upper case (2) and the lower case (1), wherein parts of the upper case (2) have mutually different rigidities, and pressure release portions (5) for releasing internal pressure of the sealed space if said internal pressure increases are formed in parts having a lower rigidity than other parts.

Description

電池パックの圧力開放構造Battery pack pressure release structure
　この発明は、電池パックの圧力開放構造に関する。 This invention relates to a pressure release structure for a battery pack.
　電気自動車や外部充電または外部給電が可能なプラグインハイブリッド車などの電動車両の加速性能の向上や高航続距離化のために、高容量・高エネルギー密度のリチウムイオン電池を採用した電池パックの車両への搭載が求められている。その一方で、リチウムイオン電池の採用に際しては、このリチウムイオン電池に発熱などの異常が発生したときの乗員の安全確保に関する法規要件が追加されるなど、より高い安全性の確保が要求されている。 Vehicles with battery packs that use high-capacity, high-energy-density lithium-ion batteries to improve acceleration performance and extend cruising range of electric vehicles such as electric vehicles and plug-in hybrid vehicles that can be recharged or supplied with external power. It is required to be installed in On the other hand, when adopting lithium-ion batteries, higher levels of safety are required, including additional legal requirements regarding ensuring the safety of passengers in the event that the lithium-ion batteries develop abnormalities such as heat generation. .
　電池パックの安全性を改善するために、この電池パックに収納されるリチウムイオン電池の特性（電解液の材料特性など）をチューニングすることが考えられる。しかしながら、例えば外国向けの電動車両の場合、その外国のリチウムイオン電池を搭載することが要求される場合があり、リチウムイオン電池のチューニングによって電池パックの安全性を改善できないこともある。 In order to improve the safety of the battery pack, it is conceivable to tune the characteristics of the lithium-ion batteries (such as the material characteristics of the electrolyte) contained in this battery pack. However, for example, in the case of an electric vehicle destined for a foreign country, it may be required to install a lithium-ion battery from that foreign country, and it may not be possible to improve the safety of the battery pack by tuning the lithium-ion battery.
　そこで、例えば下記特許文献１に係るバッテリパック１（電池パック）の圧力開放機構においては、バッテリパック１のパックケースアッパ５に開口部１２を形成し、この開口部１２を覆うように隙間調整板１３を設けている。この隙間調整板１３は、固定具１４によってパックケースアッパ５の壁５Ａに取り付けられている。通常の使用時には、隙間調整板１３が開口部１２の開口縁に近接しており、この開口部１２は実質的に閉塞している。その一方で、パックケース２内の圧力が上昇すると、パックケース２が外側に膨らもうとして湾曲変形し、壁５Ａと隙間調整板１３との間に隙間ΔＬが生じる。そして、この隙間ΔＬを通してパックケース２内部の高圧ガスが外部に排出される（特許文献１の段落００１４～００２３、図１～５などを参照）。 Therefore, for example, in the pressure release mechanism of the battery pack 1 (battery pack) according to Patent Document 1 below, an opening 12 is formed in the pack case upper 5 of the battery pack 1, and a gap adjustment plate is formed so as to cover this opening 12. There are 13. This gap adjusting plate 13 is attached to the wall 5A of the pack case upper 5 by a fixture 14. During normal use, the gap adjusting plate 13 is close to the edge of the opening 12, and the opening 12 is substantially closed. On the other hand, when the pressure inside the pack case 2 increases, the pack case 2 tries to expand outward and is deformed into a curve, creating a gap ΔL between the wall 5A and the gap adjustment plate 13. The high pressure gas inside the pack case 2 is discharged to the outside through this gap ΔL (see paragraphs 0014 to 0023, FIGS. 1 to 5, etc. of Patent Document 1).
日本国特許第６４９３５４８号公報Japanese Patent No. 6493548
　特許文献１に係る構成においては、パックケース２内の圧力が上昇すると、パックケースアッパ５が上向きに膨らもうとするが、このパックケースアッパ５の剛性が全面でほぼ均一であるため、上向きに変位しようとするものの変形は生じにくい。このため、パックケース２の内圧が溜め込まれたままの状態となりやすいという問題がある。 In the configuration according to Patent Document 1, when the pressure inside the pack case 2 increases, the pack case upper 5 tends to expand upward, but since the rigidity of the pack case upper 5 is substantially uniform over the entire surface, the upper pack case 5 tends to expand upward. Although it attempts to be displaced, deformation is unlikely to occur. Therefore, there is a problem in that the internal pressure of the pack case 2 tends to remain trapped.
　そこで、この発明は、電池モジュールの異常によって電池パックの内圧が上昇したときに、その内圧を速やかに開放することを課題とする。 Therefore, an object of the present invention is to quickly release the internal pressure of a battery pack when the internal pressure of the battery pack increases due to an abnormality in the battery module.
　上記の課題を解決するために、この発明においては、
　ロアケースと、
　前記ロアケースの上に被さるように設けられ、当該ロアケースとの間に電池モジュールを収納する密閉空間を形成するアッパーケースと、
を有し、前記アッパーケースの剛性がその部位によって異なっており、その剛性が他所と比較して相対的に低い部位に、前記密閉空間の内圧が高まった際にその内圧を開放する圧力開放部が形成されている電池パックの圧力開放構造を構成した。 In order to solve the above problems, in this invention,
lower case and
an upper case that is provided to cover the lower case and forms a sealed space between the lower case and the battery module;
, the rigidity of the upper case differs depending on the part, and a pressure release part is provided at a part where the stiffness is relatively low compared to other parts, and releases the internal pressure when the internal pressure of the closed space increases. The pressure release structure of the battery pack was constructed.
　この構成においては、
　前記電池モジュールにその内圧が高まった際にその内圧を開放する排出口が形成されており、前記排出口から放出されたガスを当該排出口から前記圧力開放部に向かって誘導するように構成されたガス誘導部を有するのが好ましい。 In this configuration,
A discharge port is formed in the battery module to release the internal pressure when the internal pressure increases, and the battery module is configured to guide gas released from the discharge port from the discharge port toward the pressure release section. It is preferable to have a gas guiding part.
　この構成においては、
　前記ガス誘導部が、前記アッパーケースの前記密閉空間に臨む面に設けられているのが好ましい。 In this configuration,
It is preferable that the gas guide portion is provided on a surface of the upper case facing the sealed space.
　この構成においては、
　前記アッパーケースの前記密閉空間に臨む面に、前記電池モジュールから前記アッパーケースへの熱移動を抑制する遮熱板が部分的に設けられており、前記アッパーケースの剛性が、当該遮熱板が設けられた部位で高く、設けられていない部位で低くなっているのが好ましい。 In this configuration,
A heat shield plate for suppressing heat transfer from the battery module to the upper case is partially provided on a surface of the upper case facing the sealed space, and the rigidity of the upper case is such that the heat shield plate It is preferable that the height is high in the areas where the height is provided, and it is low in the areas where it is not provided.
　この構成においては、
　前記遮熱板と前記ガス誘導部が一部材で構成されており、前記アッパーケースと前記遮熱板との間に、前記電池モジュールから前記アッパーケースへの熱移動を抑制する断熱空間が形成されているのが好ましい。 In this configuration,
The heat shield plate and the gas guide portion are configured as one member, and a heat insulating space is formed between the upper case and the heat shield plate to suppress heat transfer from the battery module to the upper case. It is preferable that
　この発明では、アッパーケースの剛性がその部位によって異なっており、その剛性が他所と比較して相対的に低い部位に圧力開放部が形成されている構成としたので、電池モジュールの異常によって電池パックの内圧が上昇したときに、アッパーケースが大きく変形してその内圧を速やかに開放することができる。 In this invention, the stiffness of the upper case differs depending on the part, and the pressure release part is formed in a part where the stiffness is relatively low compared to other parts, so that if the battery module malfunctions, the battery pack When the internal pressure of the upper case increases, the upper case deforms greatly and can quickly release the internal pressure.
この発明に係る電池パックの圧力開放構造の第一実施形態を示す分解斜視図An exploded perspective view showing a first embodiment of a pressure release structure for a battery pack according to the present invention 図１に示す電池パックの圧力開放構造の平面図A plan view of the pressure release structure of the battery pack shown in Figure 1 図２中のＩＩＩ－ＩＩＩ線に沿う断面図Cross-sectional view along line III-III in Figure 2 図１に示す電池パックの圧力開放構造を示す断面図であって、（ａ）は内圧が作用していない状態、（ｂ）は内圧が作用した状態FIG. 2 is a cross-sectional view showing the pressure release structure of the battery pack shown in FIG. 1, in which (a) is a state in which internal pressure is not applied, and (b) is a state in which internal pressure is applied. 参考として示す電池パックの圧力開放構造を示す断面図であって、（ａ）は内圧が作用していない状態、（ｂ）は内圧が作用した状態FIG. 3 is a cross-sectional view showing the pressure release structure of a battery pack shown as a reference, in which (a) shows a state in which no internal pressure is applied, and (b) shows a state in which internal pressure acts. この発明に係る電池パックの圧力開放構造の第二実施形態の要部の断面図A sectional view of essential parts of a second embodiment of the pressure release structure of a battery pack according to the present invention この発明に係る電池パックの圧力開放構造の第三実施形態の要部の断面図A sectional view of a main part of a third embodiment of a pressure release structure for a battery pack according to the present invention この発明に係る電池パックの圧力開放構造の第四実施形態の要部の断面図A sectional view of a main part of a fourth embodiment of a pressure release structure of a battery pack according to the present invention
　この発明に係る電池パックの圧力開放構造（以下、圧力開放構造と略称する。）の第一実施形態を図面に基づいて説明する。図１から図３に示すように、この圧力開放構造は、ロアケース１と、ロアケース１の上に被さるように設けられるアッパーケース２と、を有している。ロアケース１とアッパーケース２との間には、電池モジュール３を収納する密閉空間が形成される。 A first embodiment of a pressure release structure (hereinafter abbreviated as pressure release structure) for a battery pack according to the present invention will be described based on the drawings. As shown in FIGS. 1 to 3, this pressure release structure includes a lower case 1 and an upper case 2 provided so as to cover the lower case 1. As shown in FIGS. A sealed space in which a battery module 3 is housed is formed between the lower case 1 and the upper case 2.
　ロアケース１は、上向きに開口するトレイ状の部材であって、複数の電池モジュール３を載置することができるようになっている。その素材は特に限定されないが、この実施形態においては金属板から構成されている。 The lower case 1 is a tray-shaped member that opens upward, and is adapted to accommodate a plurality of battery modules 3. Although its material is not particularly limited, in this embodiment it is made of a metal plate.
　電池モジュール３は、リチウムイオン電池から構成されており、各電池モジュール３は縦置き（その長辺が車両の前後に沿う方向）されている。電池モジュール３の上面には、この電池モジュール３の内圧が上昇したときにその内圧を開放する排出口４が形成されている。この実施形態では縦置きされた８個の直方体状の電池モジュール３を図示しているが、あくまでも例示に過ぎず、電池モジュール３の向き、形状、サイズ、個数、電池の種類などは適宜変更することが可能である。 The battery modules 3 are composed of lithium ion batteries, and each battery module 3 is placed vertically (with its long side in the direction along the front and rear of the vehicle). A discharge port 4 is formed on the top surface of the battery module 3 to release the internal pressure when the internal pressure of the battery module 3 increases. Although this embodiment shows eight rectangular parallelepiped battery modules 3 placed vertically, this is merely an example, and the orientation, shape, size, number, type of batteries, etc. of the battery modules 3 may be changed as appropriate. Is possible.
　アッパーケース２は、平面視においてロアケース１とほぼ同じ形状をなす部材である。アッパーケース２の素材も特に限定されないが、この実施形態においては金属板から構成されている。アッパーケース２の上面には、ロアケース１とアッパーケース２によって形成される密閉空間の内圧が高まった際にその内圧を開放する圧力開放部５が２か所に形成されている。この圧力開放部５は、密閉空間の内圧が所定値以下のときは閉じており、その内圧が所定値を超えたときに開く弁とすることができる。 The upper case 2 is a member that has almost the same shape as the lower case 1 in plan view. Although the material of the upper case 2 is not particularly limited, it is made of a metal plate in this embodiment. Two pressure release portions 5 are formed on the upper surface of the upper case 2 to release the internal pressure in the sealed space formed by the lower case 1 and the upper case 2 when the internal pressure increases. The pressure release portion 5 may be a valve that is closed when the internal pressure of the closed space is below a predetermined value and opens when the internal pressure exceeds a predetermined value.
　アッパーケース２の密閉空間に臨む裏面には、この密閉空間に収納された電池モジュール３からアッパーケース２への熱移動を抑制する遮熱板６が設けられている。その素材は特に限定されないが、この実施形態においては金属板から構成されている。図３に示すように、遮熱板６は、アッパーケース２の裏面にスポット溶接部７によって固定されている。 A heat shield plate 6 is provided on the back surface of the upper case 2 facing the closed space to suppress heat transfer from the battery module 3 housed in the closed space to the upper case 2. Although its material is not particularly limited, in this embodiment it is made of a metal plate. As shown in FIG. 3, the heat shield plate 6 is fixed to the back surface of the upper case 2 by spot welds 7.
　この遮熱板６は、アッパーケース２の裏面の全面ではなく部分的に設けられている。すなわち、この実施形態においては、車両の前後方向に隙間を空けて２枚の遮熱板６が設けられている。この隙間の大きさは、アッパーケース２に形成された圧力開放部５の大きさよりも若干大きくなっている。アッパーケース２に対し部分的に遮熱板６を設けることにより、アッパーケース２の剛性が、遮熱板６が設けられた部位で高く、設けられていない部位で低くなるように、剛性を異ならせている。圧力開放部５は、アッパーケース２の剛性が低い部位に形成されている。以下においては、前方の遮熱板６を前方遮熱板６ａ、後方の遮熱板６を後方遮熱板６ｂと称する。 This heat shield plate 6 is provided not on the entire back surface of the upper case 2 but on a portion thereof. That is, in this embodiment, two heat shield plates 6 are provided with a gap in the front-rear direction of the vehicle. The size of this gap is slightly larger than the size of the pressure release part 5 formed in the upper case 2. By partially providing the heat shield plate 6 to the upper case 2, the rigidity of the upper case 2 can be made different such that the rigidity of the upper case 2 is high in the part where the heat shield plate 6 is provided and low in the part where the heat shield plate 6 is not provided. It's set. The pressure release portion 5 is formed in a portion of the upper case 2 that has low rigidity. Hereinafter, the front heat shield plate 6 will be referred to as a front heat shield plate 6a, and the rear heat shield plate 6 will be referred to as a rear heat shield plate 6b.
　前方遮熱板６ａおよび後方遮熱板６ｂの下面には、前後方向に延び下向きに突出した複数本のガス誘導部８が形成されている。ガス誘導部８の下端は電池モジュール３の上面に臨んでいる。図２に示すように、前方遮熱板６ａに形成されたガス誘導部８の後端側、および、後方遮熱板６ｂに形成されたガス誘導部８の前端側は、アッパーケース２に形成された圧力開放部５に向かって屈曲している。 A plurality of gas guide portions 8 extending in the front-rear direction and protruding downward are formed on the lower surfaces of the front heat shield plate 6a and the rear heat shield plate 6b. The lower end of the gas guide section 8 faces the upper surface of the battery module 3. As shown in FIG. 2, the rear end side of the gas guide part 8 formed on the front heat shield plate 6a and the front end side of the gas guide part 8 formed on the rear heat shield plate 6b are formed on the upper case 2. It is bent toward the pressure release part 5.
　この実施形態では、密閉空間に収納された各電池モジュール３に対し２本ずつガス誘導部８が形成されており、その２本のガス誘導部８の間に電池モジュール３に形成された排出口４が位置している。すなわち、電池モジュール３の内圧の上昇に伴って排出口４からガスが排出されると、そのガスは、電池モジュール３の上面、遮熱板６の下面、および、２本のガス誘導部８によって囲まれた隙間ｇを主要な通路として圧力開放部５まで誘導される。 In this embodiment, two gas guide portions 8 are formed for each battery module 3 housed in a sealed space, and an exhaust port is formed in the battery module 3 between the two gas guide portions 8. 4 is located. That is, when gas is discharged from the discharge port 4 as the internal pressure of the battery module 3 increases, the gas is discharged by the upper surface of the battery module 3, the lower surface of the heat shield plate 6, and the two gas guide portions 8. It is guided to the pressure release part 5 using the enclosed gap g as a main passage.
　上記の実施形態においては、２枚の遮熱板６（６ａ、６ｂ）をアッパーケース２に設けた構成としたが、電池モジュール３や圧力開放部５の数や配置によっては、１枚または３枚以上とされる可能性もある。この場合も、アッパーケース２の剛性が、遮熱板６が設けられた部位で高く、設けられていない部位で低くなるように構成され、剛性が低い部位に圧力開放部５が形成されている点は同じである。 In the above embodiment, two heat shield plates 6 (6a, 6b) are provided on the upper case 2, but depending on the number and arrangement of the battery modules 3 and pressure release parts 5, one or three heat shield plates may be used. There is a possibility that there will be more than one. In this case as well, the upper case 2 is configured such that the rigidity is high in the region where the heat shield plate 6 is provided and low in the region where it is not provided, and the pressure release portion 5 is formed in the region with low rigidity. The points are the same.
　また、上記の実施形態においては、遮熱板６をスポット溶接部７でアッパーケース２の裏面に固定したが、その固定手段はアッパーケース２と遮熱板６の素材や形状を考慮した上で、例えばネジ固定のように適宜変更することができる。 Further, in the above embodiment, the heat shield plate 6 is fixed to the back surface of the upper case 2 using the spot welding part 7, but the fixing means is determined by taking into consideration the materials and shapes of the upper case 2 and the heat shield plate 6. , for example, can be modified as appropriate, such as fixing with screws.
　この圧力開放構造の作用について説明する。例えば図４（ａ）に示すように、アッパーケース２の裏面に遮熱板６が部分的に設けられ、このアッパーケース２の剛性が、遮熱板６の設けられた部位で高く、設けられていない部位で低くなっており、この剛性の低い部位に圧力開放部５が構成されている電池パックにおいては、電池モジュール３の異常に伴ってこの電池モジュール３に形成された排出口４からガスが噴出すると電池パックの内圧が増大する。このとき、例えば図４（ｂ）に示すように、相対的に剛性が低い圧力開放部５の周辺が最上部となるように変形しつつこの圧力開放部５からガスが開放される。 The operation of this pressure release structure will be explained. For example, as shown in FIG. 4(a), a heat shield plate 6 is partially provided on the back surface of the upper case 2, and the rigidity of the upper case 2 is high at the portion where the heat shield plate 6 is provided. In a battery pack in which the pressure release part 5 is configured in a part with low rigidity, gas is discharged from the discharge port 4 formed in the battery module 3 due to an abnormality in the battery module 3. When the gas is ejected, the internal pressure of the battery pack increases. At this time, as shown in FIG. 4(b), for example, gas is released from the pressure release part 5 while deforming so that the periphery of the pressure release part 5, which has relatively low rigidity, is at the top.
　このように、アッパーケース２に剛性の高い部位と低い部位を設けることにより、電池パックの内圧が上昇したときにアッパーケース２が大きく変形するようにその変形後の形状（変形モード）を制御することができ、その内圧を速やかに開放することができる。 In this way, by providing the upper case 2 with high and low rigidity parts, the shape after deformation (deformation mode) is controlled so that the upper case 2 deforms greatly when the internal pressure of the battery pack increases. This allows the internal pressure to be released quickly.
　これに対し、例えば図５（ａ）に示すように、アッパーケース１０の裏面の広い範囲を覆うように遮熱板１１を設けた場合、このアッパーケース１０の剛性は、圧力開放部１２が形成されている部位の周辺を含め、ほぼその全面に亘って高くなる。この場合、電池モジュール１３に形成された排出口１４からガスが噴出して電池パックの内圧が増大すると、例えば図５（ｂ）に示すように、アッパーケース１０自体はその高い剛性に起因してあまり変形することなく上向きに変位しようとする。このため、電池パックの内圧が溜め込まれたままの状態となり好ましくない。 On the other hand, when the heat shield plate 11 is provided to cover a wide range of the back surface of the upper case 10 as shown in FIG. 5(a), the rigidity of the upper case 10 is The height increases over almost the entire area, including the area around the exposed area. In this case, when gas is ejected from the discharge port 14 formed in the battery module 13 and the internal pressure of the battery pack increases, the upper case 10 itself will be damaged due to its high rigidity, as shown in FIG. 5(b), for example. It tries to displace upward without deforming too much. Therefore, the internal pressure of the battery pack remains trapped, which is undesirable.
　この発明に係る圧力開放構造の第二実施形態を図６に示す。第二実施形態に係る圧力開放構造は、第一実施形態に係る構造と基本的には共通するが、遮熱板６とガス誘導部８が一部材で構成されており、アッパーケース２と遮熱板６との間に、電池モジュール３からアッパーケース２への熱移動を抑制する断熱空間ａ（空気層）が形成されている点で相違する。 A second embodiment of the pressure release structure according to the present invention is shown in FIG. The pressure release structure according to the second embodiment is basically the same as the structure according to the first embodiment, but the heat shield plate 6 and the gas guide part 8 are composed of one member, and the upper case 2 and the The difference is that a heat insulating space a (air layer) that suppresses heat transfer from the battery module 3 to the upper case 2 is formed between the heat plate 6 and the heat plate 6 .
　この遮熱板６とガス誘導部８は１枚の金属板を屈曲させることによって形成されている。電池モジュール３の内圧の上昇に伴って排出口４からガスが排出されると、そのガスは、電池モジュール３の上面、遮熱板６の下面、および、２本のガス誘導部８によって囲まれた隙間ｇを主要な通路として圧力開放部５（図１などを参照）まで誘導される。 The heat shield plate 6 and the gas guide portion 8 are formed by bending a single metal plate. When gas is discharged from the discharge port 4 as the internal pressure of the battery module 3 increases, the gas is surrounded by the upper surface of the battery module 3, the lower surface of the heat shield plate 6, and the two gas guide portions 8. It is guided to the pressure release part 5 (see FIG. 1 etc.) using the gap g as the main passage.
　このように、ガス誘導部８の形成のために金属板を屈曲させることによって、アッパーケース２の剛性が、ガス誘導部８の近傍で高く、ガス誘導部８から離れた部位で低くなっている。このため、第一実施形態と同様に、電池パックの内圧が上昇したときにアッパーケース２が大きく変形するようにその変形後の形状（変形モード）を制御することができ、その内圧を速やかに開放することができる。 In this way, by bending the metal plate to form the gas guide section 8, the rigidity of the upper case 2 is high in the vicinity of the gas guide section 8, and is low in the region away from the gas guide section 8. . Therefore, similarly to the first embodiment, the shape after deformation (deformation mode) of the upper case 2 can be controlled so that the upper case 2 is greatly deformed when the internal pressure of the battery pack increases, and the internal pressure can be quickly reduced. Can be opened.
　また、この実施形態では、アッパーケース２と遮熱板６との間に断熱空間ａを形成したので、電池モジュール３が発熱してもその熱がアッパーケース２まで伝わりにくく、このアッパーケース２は過熱状態とならない。このため、アッパーケース２の上面に形成された塗膜などに熱に起因する異常が生じるのを防止することができる。この断熱空間ａの厚みは、電池モジュール３からアッパーケース２への熱移動を所定以下に抑制し得る限りにおいて適宜決定することができる。 In addition, in this embodiment, since the heat insulating space a is formed between the upper case 2 and the heat shield plate 6, even if the battery module 3 generates heat, the heat is not easily transmitted to the upper case 2. Do not overheat. Therefore, it is possible to prevent abnormalities caused by heat from occurring in the coating film or the like formed on the upper surface of the upper case 2. The thickness of the heat insulating space a can be determined as appropriate as long as the heat transfer from the battery module 3 to the upper case 2 can be suppressed to a predetermined value or less.
　この発明に係る圧力開放構造の第三実施形態を図７に示す。第三実施形態に係る圧力開放構造は、アッパーケース２の裏面にガス誘導部８が直接形成されている点で第一実施形態などの構造と相違する。電池モジュール３の内圧の上昇に伴って排出口４からガスが排出されると、そのガスは、電池モジュール３の上面、アッパーケース２の下面、および、２本のガス誘導部８によって囲まれた隙間ｇを主要な通路として圧力開放部５（図１などを参照）まで誘導される。 A third embodiment of the pressure release structure according to the present invention is shown in FIG. The pressure release structure according to the third embodiment is different from the structure of the first embodiment in that the gas guide portion 8 is directly formed on the back surface of the upper case 2. When gas is discharged from the discharge port 4 as the internal pressure of the battery module 3 increases, the gas is surrounded by the upper surface of the battery module 3, the lower surface of the upper case 2, and the two gas guide portions 8. It is guided to the pressure release part 5 (see FIG. 1 etc.) using the gap g as a main passage.
　また、この実施形態では、ガス誘導部８がアッパーケース２を補強する補強リブとしても作用し、アッパーケース２の剛性が、ガス誘導部８が形成された部位で高く、形成されていない部位で低くなっている。そして、ガス誘導部８が形成されていない部位に圧力開放部５が形成されている。このため、上記の各実施形態と同様に、電池パックの内圧が上昇したときにアッパーケース２が大きく変形するようにその変形後の形状（変形モード）を制御することができ、その内圧を速やかに開放することができる。 Furthermore, in this embodiment, the gas guide portion 8 also acts as a reinforcing rib that reinforces the upper case 2, and the rigidity of the upper case 2 is high in the portion where the gas guide portion 8 is formed, and in the portion where the gas guide portion 8 is not formed. It's getting lower. A pressure release portion 5 is formed in a portion where the gas guide portion 8 is not formed. Therefore, similarly to each of the above embodiments, the shape after deformation (deformation mode) of the upper case 2 can be controlled so that the upper case 2 is greatly deformed when the internal pressure of the battery pack increases, and the internal pressure can be quickly reduced. can be opened to
　この発明に係る圧力開放構造の第四実施形態を図８に示す。第四実施形態に係る圧力開放構造は、アッパーケース２の一部に他の部位よりも厚みのある厚肉部９を形成した点で第一実施形態などの構造と相違する。圧力開放部５は、厚肉部９以外の部位に形成されている。このアッパーケース２の素材は特に限定されないが、部位によって容易に肉厚を変更可能な樹脂などを採用することができる。また、ダイキャスト法などの加工方法によって所望の部位に厚肉部９を成形することができる。 A fourth embodiment of the pressure release structure according to the present invention is shown in FIG. The pressure release structure according to the fourth embodiment differs from the structure of the first embodiment in that a thick portion 9 is formed in a part of the upper case 2, which is thicker than other parts. The pressure release portion 5 is formed in a portion other than the thick wall portion 9. The material of this upper case 2 is not particularly limited, but it may be made of resin or the like whose thickness can be easily changed depending on the part. Further, the thick portion 9 can be formed at a desired location by a processing method such as die casting.
　このように、アッパーケース２の厚みを部位によって変えることによって、アッパーケース２の剛性が、厚肉部９で高く、厚肉部９以外の部位で低くなっている。このため、上記の各実施形態と同様に、電池パックの内圧が上昇したときにアッパーケース２が大きく変形するようにその変形後の形状（変形モード）を制御することができ、その内圧を速やかに開放することができる。 In this way, by changing the thickness of the upper case 2 depending on the part, the rigidity of the upper case 2 is high in the thick part 9 and low in parts other than the thick part 9. Therefore, similarly to each of the above embodiments, the shape after deformation (deformation mode) of the upper case 2 can be controlled so that the upper case 2 is greatly deformed when the internal pressure of the battery pack increases, and the internal pressure can be quickly reduced. can be opened to
　今回開示された実施形態はすべての点で例示であって制限的なものではないと考えられるべきである。したがって、本発明の範囲は上記した説明ではなくて特許請求の範囲によって示され、特許請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。 The embodiments disclosed this time should be considered to be illustrative in all respects and not restrictive. Therefore, the scope of the present invention is indicated by the claims rather than the above description, and it is intended that all changes within the meaning and range equivalent to the claims are included.
　なお、本出願は、２０２２年３月２４日出願の日本特許出願（特願２０２２－０４７７９６）に基づくものであり、その内容は本出願の中に参照として援用される。 Note that this application is based on a Japanese patent application (Japanese Patent Application No. 2022-047796) filed on March 24, 2022, and the contents thereof are incorporated as a reference in this application.
１　ロアケース
２　アッパーケース
３　電池モジュール
４　排出口
５　圧力開放部
６　遮熱板
６ａ　前方遮熱板
６ｂ　後方遮熱板
７　スポット溶接部
８　ガス誘導部
９　厚肉部
ｇ　隙間
ａ　断熱空間 1 Lower case 2 Upper case 3 Battery module 4 Discharge port 5 Pressure release part 6 Heat shield plate 6a Front heat shield plate 6b Rear heat shield plate 7 Spot welding part 8 Gas guide part 9 Thick part g Gap a Heat insulation space

Claims (5)

  1. 　ロアケースと、
    　前記ロアケースの上に被さるように設けられ、当該ロアケースとの間に電池モジュールを収納する密閉空間を形成するアッパーケースと、
    を有し、前記アッパーケースの剛性がその部位によって異なっており、その剛性が他所と比較して相対的に低い部位に、前記密閉空間の内圧が高まった際にその内圧を開放する圧力開放部が形成されている電池パックの圧力開放構造。     lower case and
    an upper case that is provided to cover the lower case and forms a sealed space between the lower case and the battery module;
    , the rigidity of the upper case differs depending on the part, and a pressure release part is provided at a part where the stiffness is relatively low compared to other parts, and releases the internal pressure when the internal pressure of the closed space increases. The pressure release structure of the battery pack is formed.
  2. 　前記電池モジュールにその内圧が高まった際にその内圧を開放する排出口が形成されており、前記排出口から放出されたガスを当該排出口から前記圧力開放部に向かって誘導するように構成されたガス誘導部を有する請求項１に記載の電池パックの圧力開放構造。 A discharge port is formed in the battery module to release the internal pressure when the internal pressure increases, and the battery module is configured to guide gas released from the discharge port from the discharge port toward the pressure release section. The pressure release structure for a battery pack according to claim 1, further comprising a gas guiding section.
  3. 　前記ガス誘導部が、前記アッパーケースの前記密閉空間に臨む面に設けられている
    請求項２に記載の電池パックの圧力開放構造。     The pressure release structure for a battery pack according to claim 2, wherein the gas guide portion is provided on a surface of the upper case facing the sealed space.
  4. 　前記アッパーケースの前記密閉空間に臨む面に、前記電池モジュールから前記アッパーケースへの熱移動を抑制する遮熱板が部分的に設けられており、前記アッパーケースの剛性が、当該遮熱板が設けられた部位で高く、設けられていない部位で低くなっている請求項１または２に記載の電池パックの圧力開放構造。 A heat shield plate for suppressing heat transfer from the battery module to the upper case is partially provided on a surface of the upper case facing the sealed space, and the rigidity of the upper case is such that the heat shield plate 3. The pressure release structure for a battery pack according to claim 1, wherein the pressure relief structure is higher in the provided portion and lower in the non-provided portion.
  5. 　前記アッパーケースの前記密閉空間に臨む面に、前記電池モジュールから前記アッパーケースへの熱移動を抑制する遮熱板が部分的に設けられており、前記アッパーケースの剛性が、当該遮熱板が設けられた部位で高く、設けられていない部位で低くなっており、
    　前記遮熱板と前記ガス誘導部が一部材で構成されており、前記アッパーケースと前記遮熱板との間に、前記電池モジュールから前記アッパーケースへの熱移動を抑制する断熱空間が形成されている請求項２に記載の電池パックの圧力開放構造。     A heat shield plate for suppressing heat transfer from the battery module to the upper case is partially provided on a surface of the upper case facing the sealed space, and the rigidity of the upper case is such that the heat shield plate It is higher in areas where it is provided and lower in areas where it is not.
    The heat shield plate and the gas guide portion are configured as one member, and a heat insulating space is formed between the upper case and the heat shield plate to suppress heat transfer from the battery module to the upper case. The pressure release structure for a battery pack according to claim 2.
PCT/JP2023/006139 2022-03-24 2023-02-21 Battery pack pressure release structure WO2023181751A1 (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017033886A (en) * 2015-08-06 2017-02-09 日産自動車株式会社 Pressure release mechanism of battery pack
CN207250603U (en) * 2017-09-05 2018-04-17 上海电巴新能源科技有限公司 Battery tank shell, battery case and battery box assembly
CN110444835A (en) * 2019-08-29 2019-11-12 蜂巢能源科技有限公司 Battery pack and vehicle
JP2019197622A (en) * 2018-05-08 2019-11-14 トヨタ自動車株式会社 Battery pack
CN210349894U (en) * 2019-05-13 2020-04-17 南京天河汽车零部件股份有限公司 Intelligent control's new energy automobile battery box assembly
CN111430840A (en) * 2020-03-31 2020-07-17 蜂巢能源科技有限公司 Control method and control system for delaying thermal diffusion of power battery pack

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017033886A (en) * 2015-08-06 2017-02-09 日産自動車株式会社 Pressure release mechanism of battery pack
CN207250603U (en) * 2017-09-05 2018-04-17 上海电巴新能源科技有限公司 Battery tank shell, battery case and battery box assembly
JP2019197622A (en) * 2018-05-08 2019-11-14 トヨタ自動車株式会社 Battery pack
CN210349894U (en) * 2019-05-13 2020-04-17 南京天河汽车零部件股份有限公司 Intelligent control's new energy automobile battery box assembly
CN110444835A (en) * 2019-08-29 2019-11-12 蜂巢能源科技有限公司 Battery pack and vehicle
CN111430840A (en) * 2020-03-31 2020-07-17 蜂巢能源科技有限公司 Control method and control system for delaying thermal diffusion of power battery pack

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