Battery pack body, battery pack and power utilization system

Abstract

The utility model discloses a battery pack body, a battery pack and a power utilization system, the battery pack body comprises a shell, a heat exchange piece and a filling piece, the heat exchange piece is arranged on the shell, and a gap is formed between the heat exchange piece and the shell; the filling piece is arranged in the gap, the first surface of the filling piece is connected with the heat exchange piece, and the second surface of the filling piece is connected with the shell; the thickness of the filling piece ranges from 5 mm to 10 mm. The filling part is arranged in the gap between the heat exchange part and the shell, the heat exchange part and the shell can be connected into a whole through the filling part, so that the structural strength, the impact resistance and the structural stability of the battery pack body are enhanced, meanwhile, the thickness of the filling part is 5-10 mm, the structural strength and the impact resistance of the battery pack body can be maintained, and meanwhile, the battery pack body is not prone to falling off. The cost of the battery pack body is reduced, and the lightweight performance of the battery pack body and the volume energy density of the battery pack with the battery pack body are improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more specifically to a battery pack body, a battery pack, and a power system. Background Art

[0002] In the related art, the lower part of the battery pack body is easily impacted, causing damage to the battery pack, thereby affecting the safety and performance of the battery pack. However, the existing battery pack body protection measures have poor structural stability and are easily deformed, thereby affecting the working performance of the power battery.

[0003] In view of the above-mentioned technical problems, the present application provides a new battery pack body, battery pack, and power system. Utility Model Content

[0004] The present application is proposed to solve at least one of the above problems. According to one aspect of the present application, a battery pack body is provided, the battery pack body comprising: a shell; a heat exchanger, which is arranged on the shell, and there is a gap between the heat exchanger and the shell; a filler, which is arranged in the gap, and the first surface of the filler is connected to the heat exchanger, and the second surface of the filler is connected to the shell; wherein the thickness of the filler is 5mm to 10mm.

[0005] In some embodiments of the present application, the thickness of the filling piece is 6 mm to 8 mm.

[0006] In some embodiments of the present application, the second surface of the heat exchange element has a first concave-convex structure, and the first surface of the filling element is configured with a second concave-convex structure that matches the first concave-convex structure.

[0007] In some embodiments of the present application, the filling member is a resin layer.

[0008] In some embodiments of the present application, the filler has a first surface and a second surface opposite to each other, the first surface of the filler is bonded to the heat exchange element, and the second surface of the filler is bonded to the shell.

[0009] In some embodiments of the present application, the filling piece is a glue layer having a pore structure.

[0010] In some embodiments of the present application, the filling member includes an adhesive layer and at least one main body member disposed in the adhesive layer, and the adhesive layer is respectively bonded to the heat exchange member and the shell.

[0011] In some embodiments of the present application, the bonding layer includes a first bonding layer and a second bonding layer, the main body is bonded to the heat exchange element through the first bonding layer, and the main body is bonded to the shell through the second bonding layer.

[0012] In some embodiments of the present application, the thickness of the main body is 3 mm to 5 mm; the thickness of the first adhesive layer or the second adhesive layer is 1 mm to 3 mm.

[0013] In some embodiments of the present application, the first surface of the adhesive layer is bonded to the heat exchange element, and the second surface of the adhesive layer is bonded to the shell; and one end of the main body abuts the heat exchange element, and / or the other end of the main body abuts the shell.

[0014] In some embodiments of the present application, there are multiple main body components, and the multiple main body components are arranged in an array.

[0015] In some embodiments of the present application, the shape of the main body includes at least one of the following: a bar, a cylinder, and a prism.

[0016] In some embodiments of the present application, the main body is a glue layer having a pore structure, or the main body is a foamed cotton having a pore structure.

[0017] According to another aspect of the present application, a battery pack is provided, comprising a battery cell group and a battery pack body as described in any one of the above, wherein the battery cell group is arranged on the battery pack body.

[0018] According to another aspect of the present application, there is provided a power system including the battery pack.

[0019] According to the battery pack body, battery pack, and power system of the embodiments of the present application, a filler is provided in the gap between the heat exchanger and the shell. The filler can connect the heat exchanger and the shell as a whole, thereby enhancing the structural strength, impact resistance, and structural stability of the battery pack body. At the same time, the thickness of the filler is 5mm to 10mm, which can reduce the cost of the battery pack body while maintaining the structural strength and impact resistance of the battery pack body, and improve the lightweight performance of the battery pack body and the volume energy density of the battery pack having the battery pack body. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] By describing the embodiments of the present application in more detail in conjunction with the accompanying drawings, the above and other purposes, features and advantages of the present application will become more apparent. The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the accompanying drawings, the same reference numerals generally represent the same components or steps.

[0021] Figure 1 A schematic diagram of an explosion of a battery pack body provided according to an embodiment of the present application is shown.

[0022] Figure 2 A schematic structural diagram of a filling piece provided according to an embodiment of the present application is shown.

[0023] Figure 3 An exploded schematic diagram of a filling piece provided according to another embodiment of the present application is shown.

[0024] Figure 4 An exploded schematic diagram of a filling piece provided according to another embodiment of the present application is shown.

[0025] Figure 5 An exploded schematic diagram of a filling piece provided according to another embodiment of the present application is shown.

[0026] Figure 6 An exploded schematic diagram of a filling piece provided according to another embodiment of the present application is shown.

[0027] Figure 7 An exploded schematic diagram of a battery pack provided according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0028] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present application. However, it is apparent to those skilled in the art that the present application can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present application, some technical features well known in the art are not described.

[0029] It should be understood that the present application can be implemented in different forms and should not be construed as being limited to the embodiments presented herein. On the contrary, providing these embodiments will make the disclosure thorough and complete and fully convey the scope of the present application to those skilled in the art. In the accompanying drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity. The same reference numerals throughout represent the same elements.

[0030] It should be understood that when an element or layer is referred to as "on ...", "adjacent to ...", "connected to" or "coupled to" other elements or layers, it can be directly on, adjacent to, connected to or coupled to other elements or layers, or there can be intervening elements or layers. On the contrary, when an element is referred to as "directly on ...", "directly adjacent to ...", "directly connected to" or "directly coupled to" other elements or layers, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc. can be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present application, the first element, component, region, layer or part discussed below can be represented as a second element, component, region, layer or part.

[0031] Spatially relative terms such as "under," "beneath," "below," "under," "above," "above," and the like may be used herein for ease of description to describe the relationship of an element or feature shown in the figures to other elements or features. It should be understood that the spatially relative terms are intended to include different orientations of the device in use and operation in addition to the orientations shown in the figures. For example, if the device in the accompanying drawings is flipped, then the elements or features described as "under other elements" or "under" or "under" will be oriented as "on" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or other orientations) and the spatial descriptors used herein are interpreted accordingly.

[0032] In order to thoroughly understand the present application, a detailed structure will be presented in the following description to illustrate the technical solution proposed by the present application. The preferred embodiments of the present application are described in detail below, but in addition to these detailed descriptions, the present application may also have other implementation methods.

[0033] See also Figure 1 , which is a schematic diagram of a battery pack body 100 provided in an embodiment of the present application.

[0034] The battery pack body 100 provided in the embodiment of the present application includes: a shell, a heat exchange component 130 and a filling component 140.

[0035] The housing may be a single integral structure, or may include an upper housing 111 and a lower housing 112 (generally, the upper housing 111 may be referred to as a sealing cover, and the lower housing 112 may be referred to as a tray, i.e., the housing may be an integrated body of the sealing cover and the tray), the upper housing 111 and the lower housing 112 are connected together to form a receiving space, and the battery cell group 120, the heat exchange component 130, the filling component 140, etc. are all arranged in the receiving space. For ease of understanding, the following description is based on an example in which the housing includes the upper housing 111 and the lower housing 112.

[0036] A battery cell group 120 may be provided in the shell; wherein the battery cell group 120 may include a plurality of battery cells, and the plurality of battery cells may be connected in series or in parallel. The embodiment of the present application does not specifically limit the specific implementation form of the battery cell group 120.

[0037] The heat exchanger 130 is disposed on the housing, and the first surface of the heat exchanger 130 is connected to the battery cell group 120; the heat exchanger 130 can also be called a cold plate, which can transfer the heat generated by the battery cell group 120 during operation by means of liquid cooling to prevent the battery cell group 120 from overheating. In some battery packs 100 with a thermal management system, the cold plate can also play a role in heat preservation or heating, so that the battery pack 100 can be maintained in the best working state under different environmental conditions. The specific implementation form of the cold plate is not limited in the embodiment of the present application.

[0038] There is a gap between the second surface of the heat exchanger 130 and the lower shell 112, and the filler 140 is arranged in the gap, and the first surface of the filler 140 is connected to the second surface of the heat exchanger 130, and the second surface of the filler 140 is connected to the lower shell 112; wherein, the filler 140 can connect the heat exchanger 130 and the lower shell 112 as a whole, and the integration of the filler 140 can enhance the structural strength and structural stability of the battery pack body 100; moreover, the filler 140 can also absorb the impact force applied to the battery pack body by the outside world, play a buffering role, improve the impact resistance of the battery pack body 100, and prevent the external ball from directly penetrating the battery cell and causing leakage and the like.

[0039] In order to ensure the protective performance of the filling piece 140, there are certain requirements for the thickness of the filling piece 140. Generally speaking, in order to ensure the protective performance of the filling piece 140, the thickness of the filling piece 140 is required to be above 5 mm. In addition, it can be understood that the thicker the filling piece 140, the better the protective effect, but due to considerations of cost and weight of the battery pack body 100, the thickness of the filling piece 140 in the embodiment of the present application should not be too thick, so as to reduce the cost of the battery pack body 100 while ensuring the lightweight performance of the battery pack body 100. Exemplarily, in order to have both protective performance and cost requirements, the thickness of the filling piece 140 in the embodiment of the present application can be 5 mm to 10 mm.

[0040] Based on this, the present application provides a battery pack body 100 with good protection performance, low cost and light weight. According to the battery pack body 100 of the present application, by setting a filler 140 in the gap between the heat exchanger 130 and the shell, the filler 140 can connect the heat exchanger 130 and the shell as a whole, thereby enhancing the structural strength, impact resistance and structural stability of the battery pack body 100. At the same time, the thickness of the filler 140 is 5mm to 10mm, which can reduce the cost of the battery pack body 100 while maintaining the structural strength and impact resistance of the battery pack body 100, and improve the lightweight performance of the battery pack body 100 and the volume energy density of the battery pack having the battery pack body 100.

[0041] In order to improve the structural strength and impact resistance of the battery pack body 100 while reducing the cost of the battery pack body 100 as much as possible and improving the lightweight performance of the battery pack body 100 and the volume energy density of the battery pack having the battery pack body 100, the thickness of the filler 140 may preferably be 6 mm to 8 mm, for example, 6 mm, 7 mm, 8 mm, etc., without limitation.

[0042] It can be understood that the filling member 140 can have a variety of composition forms or structural forms, and the composition structure of the filling member 140 can be changed according to actual conditions. The present application does not limit the specific implementation form of the filling member 140.

[0043] In some embodiments of the present application, the filler is a single-layer structure. Figure 2 As shown, a filling member 240 with a single-layer structure is shown.

[0044] Among them, the second surface of the heat exchanger has a first concave-convex structure (that is, the concave-convex flow channel structure on the cold plate), and the first surface of the filler 240 can be constructed with a second concave-convex structure that matches the first concave-convex structure. The filler 240 can be tightly fitted with the first concave-convex structure on the heat exchanger through the second concave-convex structure to provide good bonding and thermal insulation performance.

[0045] Exemplarily, the filler 240 may be a resin layer, wherein spherical objects and / or powdery objects may be distributed in the resin layer.

[0046] By distributing spherical objects and / or powders in the resin layer, the filler 240 has excellent protective properties while also having flame retardant properties, compression resistance, etc. The heat exchanger and the lower shell are connected as a whole through the filler 240, thereby improving the service life and energy density of the battery pack.

[0047] The resin layer may be one of a polyurethane resin layer, an epoxy resin layer, an acrylate resin layer, an MS-EP hybrid adhesive resin layer, and the like.

[0048] The spheres can be one or more low-density materials such as expanded microspheres, hollow glass, ceramic microspheres or aerogel microspheres. When the battery pack is hit by a high-energy ball, the spheres can absorb the impact energy by breaking themselves, thereby reducing the damage to the battery pack. The particle size of the spheres can be 100μm to 200μm.

[0049] The powdery substance may be one or more of low-density resin powder or other low-density substances.

[0050] The filler 240 may have the following physical and chemical properties: the bonding strength of the filler 240 is greater than 3 MPa, so as to provide good bonding performance; the density of the filler 240 is less than 0.5 g / cm 3 , in order to facilitate lightweight; the volume resistivity of the filler 240 is greater than 10^ 12 Ω.cm, in order to provide good insulation performance.

[0051] It should be noted that the filler 240 may be connected to the heat exchanger 130 and the shell by contact or bonding, and this is not limited. Taking bonding as an example, the filler has a first surface and a second surface relative to each other, the first surface of the filler may be bonded to the second surface of the heat exchanger 130, and the second surface of the filler may be bonded to the shell.

[0052] Exemplarily, the filler 240 may be a low-density potting glue layer, for example, a glue layer with a pore structure, such as a foam glue layer, etc. The first surface of the glue layer may be bonded to the second surface of the heat exchange element 130, and the second surface of the glue layer may be bonded to the shell.

[0053] The pore structure in the adhesive layer can be irregular pores or regular pores, preferably a negative Poisson's ratio structure such as a honeycomb structure, a concave angle structure, a hand-shaped structure, a rotating rigid body structure, a pleated structure, etc. When the battery pack body is hit by a high-energy ball from the outside, the pore structure absorbs the impact energy, thereby reducing the damage to the battery pack body from the external ball hit.

[0054] The adhesive layer can be obtained by direct injection foaming and binding foaming of liquid foaming material. The foaming material can be one of foaming epoxy material, EPE (polyethylene foaming material), EVA (ethylene-vinyl acetate copolymer), EPP (polypropylene foaming material), EPS (polystyrene foaming material), MPP (microporous foamed polypropylene), E-TPU (thermoplastic polyurethane), EPDM (ethylene propylene diene monomer rubber), PET / POE (polyethylene terephthalate / polyolefin elastomer), PPO (polyphenylene ether), and PI foam (polyimide foam).

[0055] Flame retardant materials may also be added to the foaming material to make the main body have flame retardant properties. The flame retardant material may be a combination of one or more organic flame retardants and inorganic flame retardants. The organic flame retardant may be, for example, a phosphorus-based or nitrogen-based organic flame retardant, and the inorganic flame retardant may be, for example, a metal oxide flame retardant such as aluminum hydroxide or titanium dioxide.

[0056] Compared with the resin layer with spherical objects and / or powder distributed thereon, the glue layer has better bonding strength, and the bonding between the heat exchanger and the lower shell can be made more reliable through the glue layer, and the process performance requirements of the filler 240 are lower, which can further reduce the cost of the battery pack body. In addition, compared with the resin layer with spherical objects and / or powder distributed thereon, the glue layer has a lower density, which can further reduce the cost of the battery pack body.

[0057] The filler 240 of this embodiment has good flame retardancy, compression resistance, and bonding properties, and is low-cost and low-density. The lower shell and the heat exchanger are firmly connected as one through the filler, so that the battery pack has the advantages of long service life, low comprehensive cost, good protection performance, and high energy density.

[0058] In some embodiments of the present application, the filling member may also include an adhesive layer and at least one main body member disposed in the adhesive layer, and the adhesive layer is respectively bonded to the heat exchange member and the shell.

[0059] In some embodiments, the adhesive layer and at least one main body member may be constructed as a multi-layer structure, and the at least one main body member is disposed in the middle of the adhesive layer, and the whole may be in a sandwich-like structure.

[0060] like Figure 3 As shown, a filling member 340 with a multi-layer structure is shown, the filling member 340 includes an adhesive layer and a main body 342 arranged in the adhesive layer, the adhesive layer includes a first adhesive layer 341 arranged on the first surface of the main body 342 and a second adhesive layer 343 arranged on the second surface of the main body 342, the main body 342 is bonded to the heat exchange member through the first adhesive layer 341, and the main body 342 is bonded to the lower shell through the second adhesive layer 343.

[0061] Among them, the second surface of the heat exchanger has a first concave-convex structure (that is, the concave-convex flow channel structure on the cold plate), and the surface of the first adhesive layer 341 facing the heat exchanger can be constructed with a second concave-convex structure that matches the first concave-convex structure. The filling member 340 can be tightly fitted with the first concave-convex structure on the heat exchanger through the second concave-convex structure to provide good bonding and thermal insulation performance.

[0062] Exemplarily, the main body 342 may be a low-density die-cut part, for example, a glue layer with a pore structure, such as a foamed glue layer.

[0063] The pore structure in the adhesive layer can be irregular pores or regular pores, preferably a negative Poisson's ratio structure such as a honeycomb structure, a concave angle structure, a hand-shaped structure, a rotating rigid body structure, a pleated structure, etc. When the battery pack body is hit by a high-energy ball from the outside, the pore structure absorbs the impact energy, thereby reducing the damage to the battery pack body from the external ball hit.

[0064] The main body 342 can be made of a foam material that is molded or supercritically foamed to a fixed thickness and then die-cut to a suitable size. The foam material can be one of a foamed epoxy material, EPE (polyethylene foam material), EVA (ethylene-vinyl acetate copolymer), EPP (polypropylene foam material), EPS (polystyrene foam material), MPP (microporous foamed polypropylene), E-TPU (thermoplastic polyurethane), EPDM (ethylene propylene diene monomer rubber), PET / POE (polyethylene terephthalate / polyolefin elastomer), PPO (polyphenylene ether), and PI foam (polyimide foam).

[0065] A flame retardant material may also be added to the foaming material to make the main body 342 have flame retardant properties. The flame retardant material may be a combination of one or more organic flame retardants and inorganic flame retardants. The organic flame retardant may be, for example, a phosphorus-based or nitrogen-based organic flame retardant, and the inorganic flame retardant may be, for example, a metal oxide flame retardant such as aluminum hydroxide or titanium dioxide.

[0066] The main body 342 may have the following physical and chemical properties: the thickness of the main body 342 is 3 mm to 5 mm; the density of the main body 342 is ≤ 0.3 g / cm 3 , the best is <0.1g / cm 3 , so as to facilitate lightweight; the compressive strength of the main body 342 is ≥3MPa, so as to provide protection capability; the volume resistivity of the main body 342 is >10^ 12 Ω.cm, in order to provide good insulation performance.

[0067] The first adhesive layer 341 and the second adhesive layer 343 may be made of the same material or different materials, and the thicknesses of the first adhesive layer 341 and the second adhesive layer 343 may be the same or different.

[0068] Exemplarily, the first adhesive layer 341 may be a resin layer, or the second adhesive layer 343 may be a resin layer, or both the first adhesive layer 341 and the second adhesive layer 343 may be resin layers (ie, the adhesive layers are resin layers), and spherical objects and / or powders may be distributed in the resin layer.

[0069] By distributing spherical objects and / or powders in the resin layer, the filler 340 has excellent protective properties while also having flame retardant properties, compression resistance, etc. The heat exchanger and the lower shell are connected as a whole through the filler 340, thereby improving the service life and energy density of the battery pack.

[0070] The resin layer may be one of a polyurethane resin layer, an epoxy resin layer, an acrylate resin layer, an MS-EP hybrid adhesive resin layer, and the like.

[0071] The spheres can be one or more low-density materials such as expanded microspheres, hollow glass, ceramic microspheres or aerogel microspheres. When the battery pack is hit by a high-energy ball, the spheres can absorb the impact energy by breaking themselves, thereby reducing the damage to the battery pack. The particle size of the spheres can be 100μm to 200μm.

[0072] The powdery substance may be one or more of low-density resin powder or other low-density substances.

[0073] The first adhesive layer 341 or the second adhesive layer 343 may have the following physical and chemical properties: the thickness of the first adhesive layer 341 or the second adhesive layer 343 is 1 mm to 3 mm; the bonding strength of the first adhesive layer 341 or the second adhesive layer 343 is greater than 3 MPa, so as to provide good bonding performance; the density of the first adhesive layer 341 or the second adhesive layer 343 is less than 0.8 g / cm3, so as to be lightweight; the volume resistivity of the first adhesive layer 341 or the second adhesive layer 343 is greater than 10^ 12 Ω.cm, in order to provide good insulation performance.

[0074] The filler 340 of this embodiment has good flame retardancy, compression resistance, and bonding properties, and is low-cost and low-density. The lower shell and the heat exchanger are firmly connected as one through the filler 340, so that the battery pack has the advantages of long service life, low comprehensive cost, good protection performance, and high energy density.

[0075] In some embodiments, the filling member may also be a structure in which a main body is disposed inside. Exemplarily, the filling member includes an adhesive layer and a main body disposed inside the adhesive layer, a first surface of the adhesive layer is bonded to the heat exchange member, and a second surface of the adhesive layer is bonded to the lower shell; and one end of the main body abuts against the heat exchange member, and / or the other end of the main body abuts against the lower shell.

[0076] Among them, the second surface of the heat exchanger has a first concave-convex structure (that is, the concave-convex flow channel structure on the cold plate), and the first surface of the filling piece can be constructed with a second concave-convex structure that matches the first concave-convex structure. The filling piece can be tightly fitted with the first concave-convex structure on the heat exchanger through the second concave-convex structure to provide good bonding and thermal insulation performance.

[0077] It should be noted that the number of main body components in the adhesive layer can be one or more. When the number of main body components is more than one, the multiple main body components can be arranged regularly or irregularly, and there is no limitation on this.

[0078] For example, the plurality of main body members may be arranged in an array in the adhesive layer, and the array arrangement may be in the form of a linear array, a rectangular array, a circular array, a fan-shaped array, etc., which is not limited thereto.

[0079] Exemplarily, the shape of the main body may be a bar, a cylinder, a prism (may be a triangular prism, a quadrangular prism, a pentagonal prism, a hexagonal prism, etc.), or other shapes, and may be designed according to actual needs, and there is no limitation on this.

[0080] like Figure 4 , a filling member 441 is shown. The filling member 441 includes an adhesive layer 4411 and a plurality of main members 4412 disposed in the adhesive layer 4411. The main members 4412 are in the shape of strips, and the plurality of main members 4412 are arranged in a rectangular array.

[0081] like Figure 5 As shown, a filling member 442 is shown. The filling member 442 includes an adhesive layer 4421 and a plurality of main body members 4422 disposed in the adhesive layer 4421. The main body members 4422 are cylindrical in shape, and the plurality of main body members 4422 are arranged in a rectangular array.

[0082] like Figure 6 As shown, a filling member 443 is shown. The filling member 443 includes an adhesive layer 4431 and a plurality of main body members 4432 disposed in the adhesive layer 4431. The main body members 4432 are in the shape of a hexagonal prism (ie, a honeycomb shape), and the plurality of main body members 4432 are arranged in a rectangular array.

[0083] Exemplarily, the main body may be foamed cotton having an air hole structure.

[0084] The pore structure in the foam can be irregular pores or regular pores, preferably a negative Poisson's ratio structure such as a honeycomb structure, a concave angle structure, a hand-shaped structure, a rotating rigid body structure, a pleated structure, etc. When the battery pack is hit by a high-energy ball from the outside, the pore structure absorbs the impact energy, thereby reducing the damage to the battery pack from the external ball.

[0085] The density of the main body can be <0.5g / cm 3 , in order to facilitate lightweighting.

[0086] Exemplarily, the bonding layer is a resin layer, in which spherical objects and / or powdery objects are distributed.

[0087] By distributing spherical objects and / or powders in the resin layer, the filler has excellent protective properties while also having flame retardant properties, compression resistance, etc. The heat exchanger and the lower shell are connected as a whole through the filler, thereby improving the service life and energy density of the battery pack.

[0088] The resin layer may be one of a polyurethane resin layer, an epoxy resin layer, an acrylate resin layer, an MS-EP hybrid adhesive resin layer, and the like.

[0089] The spheres can be one or more low-density materials such as expanded microspheres, hollow glass, ceramic microspheres or aerogel microspheres. When the battery pack is hit by a high-energy ball, the spheres can absorb the impact energy by breaking themselves, thereby reducing the damage to the battery pack. The particle size of the spheres can be 100μm to 200μm.

[0090] The powdery substance may be one or more of low-density resin powder or other low-density substances.

[0091] The adhesive layer may have the following physical and chemical properties: the adhesive strength of the adhesive layer is greater than 3MPa, so as to provide good adhesive properties; the density of the adhesive layer is less than 0.8g / cm 3 , in order to facilitate lightweight; the volume resistivity of the adhesive layer is greater than 10^ 12 Ω.cm, in order to provide good insulation performance.

[0092] The filler of this embodiment has good flame retardancy, compression resistance, and bonding properties, and is low-cost and low-density. The lower shell and the heat exchanger are firmly connected as one through the filler, so that the battery pack has the advantages of long service life, low comprehensive cost, good protection performance, and high energy density.

[0093] According to another aspect of the present application, a battery pack is provided. Figure 7 As shown, the battery pack 500 includes a battery cell group 520 and a battery pack body, and the battery cell group 520 is arranged on the battery pack body.

[0094] Among them, the battery pack body can be implemented as the battery pack body mentioned above, and reference can be made to the introduction above, which will not be repeated here.

[0095] Specifically, the battery cell group 520 can be set in the shell of the battery pack (which may include an upper shell 511 and a lower shell 512), and the battery cell group 520 can be connected to the first surface of the heat exchange element 530. There is a gap between the second surface of the heat exchange element 530 and the lower shell 512, and the gap is filled with a filler 540.

[0096] In addition, in general, the battery pack 500 may also include a thermally conductive adhesive layer disposed between the heat exchange component 530 and the battery cell group 520. The thermally conductive adhesive layer can increase the heat transfer rate between the battery cell group 520 and the heat exchange component 530, which is more conducive to heating or cooling the battery cell group 520.

[0097] In addition, structural adhesive may be provided between the battery cell group 520 and the upper shell 511 of the battery pack body, so that the battery cell group 520 and the upper shell 511 are fixedly connected together by the structural adhesive.

[0098] According to another aspect of the present application, a power system is provided, and the power system includes a battery pack.

[0099] Among them, the battery pack can be implemented as the battery pack mentioned above, and reference can be made to the introduction above, which will not be repeated here.

[0100] It should be noted that the power consumption system mentioned above may include vehicles, ships, aircraft, energy storage equipment, etc., without limitation to this.

[0101] In summary, according to the battery pack body, battery pack, and power system of the embodiments of the present application, a filler is arranged in the gap between the heat exchanger and the shell. The filler can connect the heat exchanger and the shell as a whole, thereby enhancing the structural strength, impact resistance and structural stability of the battery pack body. At the same time, the thickness of the filler is 5mm to 10mm, which can reduce the cost of the battery pack body while maintaining the structural strength and impact resistance of the battery pack body, and improve the lightweight performance of the battery pack body and the volume energy density of the battery pack having the battery pack body.

[0102] Although example embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above example embodiments are merely exemplary and are not intended to limit the scope of the present application to this. Those of ordinary skill in the art may make various changes and modifications therein without departing from the scope and spirit of the present application. All these changes and modifications are intended to be included within the scope of the present application as required by the appended claims.

[0103] Similarly, it should be understood that in order to streamline the present application and help understand one or more of the various application aspects, in the description of the exemplary embodiments of the present application, the various features of the present application are sometimes grouped together into a single embodiment, figure, or description thereof. However, the method of the present application should not be interpreted as reflecting the following intention: the claimed application requires more features than the features clearly stated in each claim. More specifically, as reflected in the corresponding claims, the application point is that the corresponding technical problem can be solved with less than all the features of a single disclosed embodiment. Therefore, the claims following the specific embodiment are hereby explicitly incorporated into the specific embodiment, wherein each claim itself serves as a separate embodiment of the present application.

[0104] In addition, those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0105] It should be noted that the above embodiments illustrate rather than limit the present application, and that those skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets should not be construed as a limitation to the claims. The use of the words first, second, and third, etc. does not indicate any order. These words may be interpreted as names.

Claims

1. A battery pack, characterized in that: The battery pack body comprises: case; A heat exchange element is disposed on the shell, with a gap between the heat exchange element and the shell; A filling member is disposed in the gap, a first surface of the filling member is connected to the heat exchange member, and a second surface of the filling member is connected to the shell; Wherein, the thickness of the filling piece is 5 mm to 10 mm.

2. The battery pack body according to claim 1, characterized in that: The thickness of the filling piece is 6 mm to 8 mm.

3. The battery pack body according to claim 1, characterized in that: The second surface of the heat exchange member has a first concave-convex structure, and the first surface of the filling member is configured with a second concave-convex structure that matches the first concave-convex structure.

4. The battery pack body according to claim 1, characterized in that: The filling piece is a resin layer.

5. The battery pack body according to claim 1, characterized in that: The filler has a first surface and a second surface opposite to each other. The first surface of the filler is bonded to the heat exchange element, and the second surface of the filler is bonded to the shell.

6. The battery pack body according to claim 5, characterized in that: The filling piece is a glue layer with a pore structure.

7. The battery pack body according to claim 5, characterized in that: The filling member includes an adhesive layer and at least one main body member arranged in the adhesive layer, and the adhesive layer is respectively bonded to the heat exchange member and the shell.

8. The battery pack body according to claim 7, characterized in that: The bonding layer includes a first bonding layer and a second bonding layer. The main body is bonded to the heat exchange element through the first bonding layer, and the main body is bonded to the shell through the second bonding layer.

9. The battery pack body according to claim 8, characterized in that: The thickness of the main body is 3 mm to 5 mm; The thickness of the first adhesive layer or the second adhesive layer is 1 mm to 3 mm.

10. The battery pack body according to claim 7, characterized in that: The first surface of the adhesive layer is bonded to the heat exchange element, and the second surface of the adhesive layer is bonded to the shell; One end of the main body abuts against the heat exchange element, and / or the other end of the main body abuts against the shell.

11. The battery pack body according to any one of claims 7 to 10, characterized in that: There are multiple main body components, and the multiple main body components are arranged in an array.

12. The battery pack body according to any one of claims 7 to 10, characterized in that: The shape of the main body includes at least one of the following: bar, cylinder, prism.

13. The battery pack body according to any one of claims 7 to 10, characterized in that: The main body is a glue layer with a pore structure, or the main body is a foam with a pore structure.

14. A battery pack, characterized in that: The invention comprises a battery cell group and a battery pack body as claimed in any one of claims 1 to 13, wherein the battery cell group is arranged on the battery pack body.

15. An electricity system, characterized in that: Comprising the battery pack as claimed in claim 14.

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