CN220290909U - Battery pack and power utilization device - Google Patents
Battery pack and power utilization device Download PDFInfo
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- CN220290909U CN220290909U CN202321774895.5U CN202321774895U CN220290909U CN 220290909 U CN220290909 U CN 220290909U CN 202321774895 U CN202321774895 U CN 202321774895U CN 220290909 U CN220290909 U CN 220290909U
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- 229910001416 lithium ion Inorganic materials 0.000 description 3
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
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- JDZCKJOXGCMJGS-UHFFFAOYSA-N [Li].[S] Chemical compound [Li].[S] JDZCKJOXGCMJGS-UHFFFAOYSA-N 0.000 description 1
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Classifications
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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 application discloses battery package and power consumption device, battery package includes: a plurality of battery modules arranged in a second direction y, a thermal management member and a heat insulator disposed between adjacent battery modules; the battery module comprises a plurality of single batteries arranged along a first direction x, wherein each single battery comprises a shell, and the shell is provided with a first side wall and a second side wall; the heat insulating piece is contacted with the second side wall; the insulation member has an average thickness D in the first direction 1 mm, thermal insulationThe thermal conductivity of the member is lambda 1 W/(mK); the average thickness of the second side wall in the first direction is D 2 mm, the heat conductivity coefficient of the second side wall is lambda 2 W/(m.K), satisfy:the heat insulation piece has the advantages that the function of greatly slowing down heat transfer between the single batteries is achieved, and the risk of system-level heat diffusion of the batteries caused by thermal runaway of the single batteries can be effectively reduced; meanwhile, the battery pack can be guaranteed to have higher volume utilization rate.
Description
Technical Field
The application belongs to the technical field of batteries, and particularly relates to a battery pack and an electric device.
Background
The power battery can produce heat in the use, and the too high performance and the life of battery can cause adverse effect, though can carry out temperature regulation to the battery cell of power battery through setting up thermal management system, but thermal management system's current structural design hardly suppresses the thermal diffusion between the battery cell, changes current structural design and hardly guarantees again that the battery package has higher volume utilization ratio.
Disclosure of Invention
The utility model aims to: the application provides a battery pack, which is used for improving thermal diffusion among single batteries and has higher volume utilization rate; another object of the present application is to provide an electric device comprising the above battery pack.
Technical scheme, this application provides a battery package, includes: a plurality of battery modules arranged in a second direction y and a thermal management member disposed between adjacent battery modules; wherein, the battery module includes: the plurality of single batteries are arranged along a first direction x, the single batteries comprise a shell, the shell is provided with two opposite first side walls and two opposite second side walls, the first side walls and the second side walls are connected, the surface area of the second side walls is smaller than that of the first side walls, and the first direction x is intersected with the second direction y;
the heat insulation piece is arranged between the second side walls of the adjacent single batteries, and is in contact with the second side walls;
the insulation member has an average dimension D in the first direction x 1 mm, the heat conductivity coefficient of the heat insulation piece is lambda 1 W/(mK); the average size of the second side wall in the first direction x is D 2 mm, the heat conductivity coefficient of the second side wall is lambda 2 W/(m.K), satisfy:
in some embodiments, the battery pack further satisfies at least one of the following conditions:
a)1≤D 1 /D 2 ≤30；
b)3×10 -5 ≤λ 1 /λ 2 ≤0.003。
in some embodiments, the insulation has a resistivity of kΩ·cm, and the battery pack further satisfies:
in some embodiments, the battery pack satisfies at least one of the following conditions:
c)1≤D 1 ≤6；
d)0.01≤λ 1 ≤0.07；
e)0.3≤D 2 ≤0.8；
f)40≤λ 2 ≤270；
g)1×10 12 ≤K≤1×10 18 。
in some embodiments, the single cell includes an insulating layer connecting the first sidewall and at least a portion of the second sidewall, and the thermal insulator is bonded to at least one of the insulating layer and the second sidewall.
In some embodiments, the insulating layer satisfies at least one of the following conditions:
h) The thickness of the insulating layer is 0.05-1.5 mm;
i) The heat conductivity coefficient of the insulating layer is 0.1-6W/(m.K);
j) The resistivity of the insulating layer is 10 12 ～10 18 Ω·cm。
In some embodiments, the surface of the insulating member that is connected to the second side wall has an area S 1 mm 2 The surface area of the second side wall is S 2 mm 2 ：
0.5≤S 1 /S 2 ≤1。
In some embodiments, the number of the heat insulating pieces is plural, and the plural heat insulating pieces are arranged at intervals along the first direction x, and the first direction x, the thickness direction of the heat insulating pieces, and the thickness direction of the second side wall are parallel to each other.
In some embodiments, the thermal management component has a third sidewall and a fourth sidewall respectively conforming to the first sidewall, the third and fourth sidewalls symmetrically disposed along the second direction y, a cavity formed between the third and fourth sidewalls configured to receive a heat exchange medium to regulate the temperature of the battery module.
In some embodiments, the thermal management component includes a first current collector and a second current collector in communication with ends of the cavity disposed opposite the first direction x, respectively, the first direction x being perpendicular to a thickness direction of the thermal management component.
In some embodiments, the present application also provides an electrical device comprising the battery pack.
The beneficial effects are that: compared with the prior art, the battery package of this application includes: a plurality of battery modules arranged in a second direction y and a thermal management member disposed between adjacent battery modules; wherein, the battery module includes: the plurality of single batteries are arranged along a first direction x, each single battery comprises a shell, the shell is provided with two opposite first side walls and two opposite second side walls, the first side walls are connected with the second side walls, the surface area of the second side walls is smaller than that of the first side walls, and the first direction x is perpendicular to the second direction y; the heat insulation piece is arranged between the second side walls of the adjacent single batteries and is contacted with the second side walls; the insulation element has an average dimension D in the first direction x 1 mm, the heat conductivity coefficient of the heat insulation piece is lambda 1 W/(mK); the second side wall has an average dimension D in the first direction x 2 mm, the heat conductivity coefficient of the second side wall is lambda 2 W/(m.K), satisfy:according to the battery pack, the heat insulation pieces are arranged between the single batteries, when the heat insulation pieces and the single batteries meet the relation, the function of greatly slowing down heat transfer between the single batteries is achieved, the heat insulation effect of the heat insulation pieces on the single batteries can be guaranteed, the risk of system-level heat diffusion of the batteries caused by thermal runaway of the single batteries can be effectively reduced, and the service life and the service performance of the batteries are improved; meanwhile, the battery pack can be guaranteed to have higher volume utilization rate.
It can be appreciated that, compared with the prior art, the electricity consumption device provided in the embodiment of the present application has all the technical features and beneficial effects of the above battery pack, and is not described herein again.
Drawings
Technical solutions and other advantageous effects of the present application will be made apparent from the following detailed description of specific embodiments of the present application with reference to the accompanying drawings.
Fig. 1 is a schematic view of a battery pack according to an embodiment of the present disclosure;
fig. 2 is an exploded view of a battery pack structure according to an embodiment of the present application;
fig. 3 is a front view of a battery pack according to an embodiment of the present application;
FIG. 4 is a schematic view in partial cross-section along the direction C-C in FIG. 3;
FIG. 5 is a partially enlarged schematic illustration at B in FIG. 4;
fig. 6 is an assembly schematic diagram of two single batteries and a heat insulation member according to an embodiment of the present disclosure;
fig. 7 is a schematic contact diagram of a single battery and a heat insulation member according to an embodiment of the present disclosure;
FIG. 8 is a schematic cross-sectional view taken along the direction A-A in FIG. 3;
reference numeral, 10-battery module, 20-thermal management component, 100-battery cell, 101-housing, 1011-first side wall, 1012-second side wall, 102-coating film, 200-heat insulator, 201-third side wall, 202-fourth side wall, 203-cavity, 204-first current collector, 205-second current collector.
Detailed Description
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. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more features.
The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application.
In the present application, the battery may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, to which the embodiment of the present application is not limited. The battery comprises an electrode assembly and electrolyte, wherein the electrode assembly consists of a positive plate, a negative plate and a separation membrane. The battery mainly relies on metal ions moving between the positive and negative plates to operate. The positive plate comprises a positive current collector and a positive active material layer, and the positive active material layer is coated on the surface of the positive current collector. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer coated on a surface of the negative electrode current collector.
It is understood that reference to a battery pack in accordance with embodiments of the present application refers to a single physical module that includes one or more batteries to provide higher voltage and capacity. To improve the safety of the battery, a thermal management component is also typically included in the battery. The heat management component is internally provided with a heat exchange medium to adjust the temperature of the battery, so that the battery is in a proper working temperature range, and higher safety is ensured. The heat exchange medium may be a fluid (liquid) or a gas, and the temperature adjustment means heating or cooling the plurality of cells. Alternatively, the fluid may be circulated to achieve better temperature regulation. The fluid may be water, a mixture of water and glycol, or air. When the thermal management member is used to contain a cooling fluid to reduce the temperature of the plurality of unit cells, the thermal management member may also be referred to as a cooling member, a cooling system, a cooling plate, or the like, and the fluid contained therein may also be referred to as a cooling medium or cooling fluid. When the fluid contained in the thermal management component is cooling water, the thermal management component can also be called a water cooling plate, and the water cooling plate contacts the single battery and can be used for reducing the temperature of the single battery so as to prevent the single battery from thermal runaway.
The applicant has found that during use of the battery pack, the cells within the battery pack generate heat. If the heat is too high, the performance and the service life of the single batteries are adversely affected, and although the thermal management system is used for adjusting the temperature of the single batteries in the battery pack, in most cases, the thermal management system is not in contact with each surface of the single batteries, and especially heat transfer is easy to occur between adjacent single batteries, and if no component for blocking the heat transfer is not provided, heat transfer is rapid between the single batteries, and heat spreading occurs.
In view of the foregoing, embodiments of the present application provide a battery pack and an electric device to overcome the above technical problems.
Referring to fig. 1 and 2, a battery pack according to an embodiment of the present application includes: a plurality of battery modules 10 arranged in the second direction y, a thermal management member 20 disposed between adjacent battery modules 10, and a heat insulator 200; with further reference to fig. 3, 4 and 5, the battery module 10 includes: a plurality of unit cells 100 arranged along a first direction x, the unit cells 100 including a housing 101, the housing 101 having two opposite first side walls 1011 and two opposite second side walls 1012, the first side walls 1011 and the second side walls 1012 being connected, a surface area of the second side walls 1012 being smaller than a surface area of the first side walls 1011, the first direction x intersecting the second direction y; the insulation 200 contacts the second sidewall 1012, the insulation 200 having an average thickness D in the first direction x 1 mm, thermal conductivity of thermal insulator 200 is λ 1 W/(mK); the second sidewall 1012 has an average thickness D in the first direction x 2 mm, the second sidewall 1012 has a thermal conductivity of lambda 2 W/(m.K), satisfy:according to the battery pack, the heat insulation pieces are arranged between the single batteries, when the heat insulation pieces and the single batteries meet the relation, the function of greatly slowing down heat transfer between the single batteries is achieved, the heat insulation effect of the heat insulation pieces on the single batteries can be guaranteed, the risk of system-level heat diffusion of the batteries caused by thermal runaway of the single batteries can be effectively reduced, and the service life and the service performance of the batteries are improved; meanwhile, the battery pack can be guaranteed to have higher volume utilization rate.
In some embodiments, taking fig. 1 as an example, the first direction x and the second direction y are directions indicated by corresponding arrows, respectively; in the second direction y, the battery modules 10 and the thermal management members 20 are alternately arranged; in the first direction x, each battery module 10 includes 6 groups of unit cells 100 arranged in a row, and the unit cells 100 and the heat insulators 200 are also alternately arranged. The first direction x and the second direction y are intersected, and the angle of the first direction x and the second direction y can be adjusted according to the requirement. Further, the first direction x and the second direction y are perpendicular to each other, where perpendicular means completely perpendicular or almost completely perpendicular, e.g. all calculated as perpendicular within 5 ° of completely perpendicular.
Further, when meetingWhen the ratio is less than 12000, the heat insulating ability of the heat insulating member 200 is too poor to effectively realize the heat insulating effect between the unit batteries 100, particularly when the unit batteries 100 are out of control, the heat between the unit batteries 100 cannot be effectively blocked, so that the heat spreading situation occurs; if the ratio is greater than 4X 10 5 In this case, the heat insulating performance of the heat insulator 200 is excellent, but the high heat insulating performance may reduce the volume utilization rate of the battery pack. In some embodiments, the battery pack further satisfies: 3X 10 -5 ≤λ 1 /λ 2 At 0.003, when the above range is satisfied, the heat insulating effect of the unit cell 100 can be further ensured while the cost of the heat insulator 200 can be kept from being excessively high to increase the cost of the battery pack. Further, lambda 1 /λ 2 The value of (2) may be 3×10 -5 、1×10 -5 、3×10 -4 、1×10 -4 Any one value or a range between any two values in 0.003.
In some embodiments, the battery pack further satisfies: d is not less than 1 1 /D 2 And less than or equal to 30, when the above range is satisfied, the heat insulation effect of the heat insulation member 200 is ensured, and at the same time, the volume of the heat insulation member 200 is effectively controlled, and the cost and the volume utilization rate of the battery pack are controlled to some extent. Further, D 1 /D 2 The value of (c) may be any one or a range between any two of 1, 1.5, 2, 2.5, 3, 5, 8, 10, 15, 20, 25, 26, 27, 28, 29, 30.
Further, an average thickness D of the thermal shield 200 in the first direction x 1 mm satisfies: d is not less than 1 1 6. Ltoreq.6, e.g.D 1 Can be any one of 1, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 5.5, 5.0, 5.5 and 6.0 orA range between any two values. The second sidewall 1012 has an average thickness D in the first direction x 2 mm satisfies: d is more than or equal to 0.3 2 Less than or equal to 0.8, e.g., D 2 Any one value or a range between any two values of 0.3, 0.4, 0.5, 0.6, 0.7 and 0.8 are possible. Overdetermined D 1 、D 2 Can ensure that the whole structure of the battery meets the stress requirement, and realize the isolation of the heat insulation piece 200 to the heat of the single battery 100. The installation of the heat insulating piece 200 is not affected, and the functions of heat insulation, buffering and the like of the heat insulating piece 200 are not affected; the thickness of the heat insulating member 200 and the thickness of the housing 101 are not too large, so that the internal space of the battery pack is large, and the energy density and the volume utilization rate of the whole pack are affected. In some embodiments, D is described above 1 、D 2 The thickness of the insulation 200 and the second sidewall 1012 can be measured directly by calipers.
Further, the thermal conductivity lambda of the thermal insulation member 200 1 W/(m.K) satisfies: lambda is more than or equal to 0.01 1 Less than or equal to 0.07; for example lambda 1 The value of (2) may be any one value or a range between any two values of 0.01, 0.015, 0.02, 0.025, 0.03, 0.035, 0.04, 0.045, 0.05, 0.055, 0.06, 0.065 and 0.07; coefficient of thermal conductivity lambda of the second sidewall 1012 2 W/(m.K) satisfies: lambda is not less than 40 2 Less than or equal to 270; for example lambda 2 The value of (c) may be any one value or a range between any two values of 40, 50, 80, 100, 150, 200, 250 and 270. By aligning lambda 1 And lambda (lambda) 2 The limitation is performed to ensure that the overall structure of the battery pack satisfies the stress requirement, and the heat insulation of the heat insulator 200 to the unit battery 100 can be realized.
In some embodiments, the above measurement of thermal conductivity may include: a pulse heating transient method, a hot wire method, a probe method, a tropical method, a hot plate method, a transient plane heat source method, a double-spiral probe plane heat source method, a laser method and the like. Lambda in the present embodiment 1 And lambda (lambda) 2 The same test method is adopted to obtain the product.
In some embodiments, the thermal shield 200 may be a porous or multi-layered structure; the foaming resin material is typically formed by adopting in-mold foaming steam of small-particle-size particles, so that free and thin-wall shape design can be realized, heat insulation can be met, and light weight can be realized; the multi-layer structure is made of lamination of various materials, so that the heat insulation effect can be further improved; preferably, the heat insulating member 200 may be aerogel, or plastic material such as PP or PET, or resin material, etc.; the heat insulating member 200 may be made of a single material or a multi-layered composite material.
In some embodiments, the shape of the heat insulating member 200 is not limited to any one of rectangle, circle, ellipse, and polygon, and the shape of the heat insulating member 200 may be substantially the shape described above, and is not limited to a perfect geometry.
In some embodiments, the number of the heat insulating members 200 is plural, and the plural means at least 2 or more, and the heat insulating members 200 are arranged at intervals along the first direction x, and the first direction x, the thickness direction of the heat insulating members 200, and the thickness direction of the second side wall 1012 are parallel to each other. Parallel here means completely parallel or almost completely parallel, for example, all calculated as parallel within 5 ° of completely parallel. It should be noted that, when the thermal insulation member 200 is deformed due to expansion of the unit battery 100 during use, the parallel direction is only required to be parallel. I.e. the parallelism of the undeformed regions.
In some embodiments, in order for the heat insulator 200 to achieve the heat insulating effect on the unit cell 100, it is necessary to further define the contact area between the two, and the surface of the heat insulator 200 connected to the second sidewall 1012 has an area S 1 mm 2 The surface area of the second sidewall 1012 is S 2 mm 2 The method comprises the following steps: s is more than or equal to 0.5 1 /S 2 And is less than or equal to 1. The setting of this range ensures the heat insulating effect of the heat insulating member 200, and the heat insulating member 200 does not affect the entire volume of the battery pack within a prescribed contact area.
By defining S, the heat insulator 200 is in surface-to-surface contact with the unit cell 100 1 And S is 2 On the one hand, the heat insulation effect can be prevented from being influenced by too small heat insulation member 200, and on the other hand, the performance of the battery pack can be prevented from being influenced by too large heat insulation member 200.
In some embodiments, the thermal shield 200 alsoHas certain insulating property and can prevent the short circuit phenomenon from occurring between the unit batteries 100 and the unit batteries 100 through the direct contact or the indirect contact of the second side wall 1012. Note that the heat insulating member 200 has insulating properties, that is, the heat insulating member 200 can satisfy insulating properties in addition to the heat insulating properties that it is required to have. Wherein, the resistivity of the heat insulating member 200 is kΩ·cm, and the battery pack further satisfies:
it can be understood that, as the surface of the shell of part of the single battery is provided with an insulation structure, the insulation structure has a windowing design, i.e. the surface of the shell of the single battery is partially exposed; or when the insulating structure is broken, the insulating member 200 has insulating properties to further prevent the battery from being shorted, thereby reducing potential safety hazards. When the above-described relationship range is satisfied, the heat insulator 200 can also prevent possible short circuits between the batteries under the function of ensuring the heat insulating effect. The insulating structure may be a film layer having an insulating structure, for example, a blue film, a black film, a coating layer, and the like.
Further, the resistivity kΩ·cm of the heat insulator 200 satisfies: 1X 10 12 ≤K≤1×10 18 The method comprises the steps of carrying out a first treatment on the surface of the For example, K may be 1X 10 12 、1×10 13 、1×10 14 、1×10 15 、1×10 16 、1×10 17 、1×10 18 Any one or a range between any two of the values.
In some embodiments, in order to further prevent a short circuit between the unit cells 100, referring to fig. 6 and 7, the unit cells 100 include an insulating layer 102, and the case 101 has a first sidewall 1011 parallel to the first direction x, the first sidewall 1011 being connected with a second sidewall 1012; the insulating layer 102 connects the first side wall 1011 and at least a portion of the second side wall 1012, and the heat insulator 200 is bonded to at least one of the insulating layer 102 and the second side wall 1012. Further, the heat shield 200 is attached to the second side wall 1012; alternatively, the thermal shield 200 is bonded to the insulating layer 102, or alternatively, the thermal shield 200 is bonded to both the insulating layer 102 and the second sidewall.
In some embodiments, the insulating layer 102 may be an insulating film coated on the outer surface of the unit cell 100, or may be formed by directly coating a thin insulating medium on the unit cell 100 through a spraying process.
In some embodiments, the thickness of the insulating layer 102 is 0.05-1.5 mm, e.g., the thickness of the insulating layer 102 is any one or a range between any two of 0.05mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5 mm.
In some embodiments, the thermal conductivity of the insulating layer 102 is 0.1-6W/(m·k), for example, the thermal conductivity of the insulating layer 102 is any one or a range between any two of 0.1W/(m·k), 0.2W/(m·k), 0.3W/(m·k), 0.4W/(m·k), 0.5W/(m·k), 0.6W/(m·k), 0.7W/(m·k), 0.8W/(m·k), 0.9W/(m·k), 1.0W/(m·k), 1.5W/(m·k), 2.0W/(m·k), 2.5W/(m·k), 3.0W/(m·k), 4.0W/(m·k), 4.5W/(m·k), 5.0W/(m·k), 5.5W/(m·k), 6.0W/(m·k).
In some embodiments, the resistivity of the insulating layer 102 is 10 12 ～10 18 Omega cm. When this range is satisfied, the insulating layer 102 is an insulating film, and it is possible to further prevent a short circuit between the unit cells 100.
In some embodiments, referring to fig. 6, the thermal management component 20 has a third sidewall 201 and a fourth sidewall 202, the third sidewall 201 and the fourth sidewall 202 respectively conforming to the first sidewall 1011, the third sidewall 201 and the fourth sidewall 202 symmetrically disposed along the second direction y, a cavity 203 is formed between the third sidewall 201 and the fourth sidewall 202, and the cavity 203 is configured to receive a heat exchange medium to regulate the temperature of the battery module 10. By filling the heat exchange medium in the thermal management member 20, the thermal management member 20 may absorb heat generated from the battery module 10 to achieve a heat dissipation effect.
In some embodiments, with further reference to fig. 2 and 8, the thermal management component 20 includes a first current collector 204 and a second current collector 205, the first current collector 204 and the second current collector 205 respectively communicating with ends of the cavity 203 disposed opposite along a first direction x, the first direction x being perpendicular to a thickness direction of the thermal management component 20. It is understood that the first current collector 204 and the second current collector 205 may be respectively used as an inlet and an outlet of the heat exchange medium, so that the heat exchange medium can circulate in the cavity to achieve the heat dissipation effect. Meanwhile, each thermal management member 20 may adjust the temperature of all the unit cells 100 in the adjacent two rows of the battery modules 10. Vertical here means completely vertical or almost completely vertical, for example, all being considered as vertical within 5 ° of completely vertical.
In some embodiments, each cell 100 includes two oppositely disposed first side walls 1011 and two oppositely disposed second side walls 1012; the first side wall 1011 may be understood as a large surface of the unit cell 100, which is a surface of the unit cell 100 having the largest area.
In some embodiments, the present embodiment further provides an electric device, where the electric device includes the battery pack shown in the first embodiment or the second embodiment. The electric device may be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool, or the like. The vehicle can be a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or an extended range automobile and the like; spacecraft including airplanes, rockets, space planes, spacecraft, and the like; the electric toy includes fixed or mobile electric toys, such as a game machine, an electric car toy, an electric ship toy, and an electric airplane toy; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete shakers, and electric planers, among others. The embodiment of the application does not limit the electric device in particular.
Taking the structure of the battery pack of fig. 1 as an example, battery packs of examples 1 to 19 were prepared, respectively, each satisfyingIs not satisfied by the simultaneous preparation of +.>Battery packs of the same range but structure were used as comparative examples 1 to 4. The specific parameter values and test results of each of the examples and comparative examples are shown in table 1. The test method is as follows:
test method of thermal diffusion: the heat diffusion test was performed on the battery pack according to the clause c.5.3 in the GB 38031-2022 standard.
The method for testing the highest temperature of the adjacent single battery comprises the following steps: in a thermal diffusion test, attaching and arranging temperature sensors on all surfaces of adjacent single batteries around the single batteries serving as thermal runaway triggering objects, monitoring temperature changes of the adjacent single batteries in a thermal diffusion test period, comparing temperature values of all surfaces of each adjacent single battery, and taking the highest value to record as the highest temperature of the adjacent single batteries;
the method for testing the volume utilization rate comprises the following steps:
1) Taking at least 5 single batteries at random positions in the battery pack, and measuring the length, width, height and the like of the single batteries respectively;
2) Respectively calculating the volumes of a plurality of single batteries according to the length, width, height and other dimensions, and taking an average value;
3) The volume V occupied by all the single batteries in the whole package is obtained by multiplying the volume average value by the number of the single batteries in the battery package 1 ；
4) Calculating the envelope size of the battery pack to obtain the volume V of the whole pack 2 ；
5) The volume utilization = V 1 /V 2 *100％。
TABLE 1
As can be seen from Table 1, the battery packs of examples 1 to 19 of the present application satisfy the following conditions compared with comparative examples 1 to 4In the range of (2), as the heat insulation piece is arranged, the function of greatly slowing down heat transfer between the single batteries by the heat insulation piece is realized, the heat insulation effect of the heat insulation piece on the single batteries can be ensured, the risk of system-level heat diffusion of the batteries caused by thermal runaway of the single batteries can be effectively reduced, and the service life and the service performance of the batteries are improved; meanwhile, the battery pack can be guaranteed to have higher volume utilization rate.
The above describes in detail a battery pack and an electric device provided in the embodiments of the present application, and specific examples are applied in the present application to illustrate the principles and embodiments of the present application, where the above description of the embodiments is only for helping to understand the technical solution and core ideas of the present application; those of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. A battery pack, comprising: a plurality of battery modules (10) arranged in a second direction (y) and a thermal management member (20) provided between adjacent battery modules (10);
wherein the battery module (10) comprises:
a plurality of unit cells (100) arranged along a first direction (x), the unit cells (100) comprising a housing (101), the housing (101) having two opposing first side walls (1011) and two opposing second side walls (1012), the first side walls (1011) and the second side walls (1012) being connected, the second side walls (1012) having a surface area smaller than the surface area of the first side walls (1011), the first direction (x) intersecting the second direction (y);
a heat insulating member (200), wherein the heat insulating member (200) is arranged between the second side walls (1012) of the adjacent single batteries (100), and the heat insulating member (200) is in contact with the second side walls (1012);
the insulation (200) has an average dimension D in the first direction (x) 1 mm, the thermal conductivity of the heat insulating piece (200) is lambda 1 W/(mK); the second side wall (1012) has an average dimension D in the first direction (x) 2 mm, the heat conductivity coefficient of the second side wall (1012) is lambda 2 W/(m.K), satisfy:
2. the battery pack of claim 1, wherein the battery pack further satisfies at least one of the following conditions:
a)1≤D 1 /D 2 ≤30；
b)3×10 -5 ≤λ 1 /λ 2 ≤0.003。
3. the battery pack according to claim 2, wherein the thermal insulation member (200) has a resistivity of kΩ -cm, the battery pack further satisfying:
4. the battery pack of claim 3, wherein the battery pack satisfies at least one of the following conditions:
c)1≤D 1 ≤6；
d)0.01≤λ 1 ≤0.07；
e)0.3≤D 2 ≤0.8；
f)40≤λ 2 ≤270；
g)1×10 12 ≤K≤1×10 18 。
5. the battery pack according to claim 1, wherein the unit cell (100) includes an insulating layer (102), the insulating layer (102) connects the first side wall (1011) and at least a part of the second side wall (1012), and the heat insulator (200) is attached to at least one of the insulating layer (102) and the second side wall (1012).
6. The battery pack according to claim 1, wherein the surface of the heat insulator (200) to which the second side wall (1012) is connected has an area S 1 mm 2 The surface area of the second side wall (1012) is S 2 mm 2 The method comprises the following steps:
0.5≤S 1 /S 2 ≤1。
7. the battery pack according to claim 1, wherein the number of the heat insulating members (200) is plural, and the plural heat insulating members (200) are arranged at intervals in the first direction (x), and the first direction (x), the thickness direction of the heat insulating members (200), and the thickness direction of the second side wall (1012) are parallel to each other.
8. The battery pack according to claim 5, wherein the thermal management component (20) has a third side wall (201) and a fourth side wall (202), the third side wall (201) and the fourth side wall (202) being respectively bonded to the first side wall (1011), the third side wall (201) and the fourth side wall (202) being symmetrically disposed along the second direction (y), a cavity (203) being formed between the third side wall (201) and the fourth side wall (202), the cavity (203) being configured to accommodate a heat exchange medium to adjust the temperature of the battery module (10).
9. The battery pack according to claim 8, wherein the thermal management component (20) includes a first current collector (204) and a second current collector (205), the first current collector (204) and the second current collector (205) communicating with ends of the cavity (203) disposed opposite to each other in the first direction (x), the first direction (x) being perpendicular to a thickness direction of the thermal management component (20).
10. An electrical device comprising a battery pack according to any one of claims 1 to 9.
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| CN202321774895.5U CN220290909U (en) | 2023-07-06 | 2023-07-06 | Battery pack and power utilization device |
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| CN202321774895.5U CN220290909U (en) | 2023-07-06 | 2023-07-06 | Battery pack and power utilization device |
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