Battery and electric device

Abstract

The utility model relates to a battery and an electric device. The battery comprises a supporting plate; plate cooling; the first vacuum filling piece is arranged between the supporting plate and the cold plate; the first vacuum filling piece comprises a heat preservation layer and an air isolation film wrapping the outer surface of the heat preservation layer. The battery cell group is in contact heat exchange with one side, deviating from the supporting plate, of the cold plate, and the cold plate is used for cooling the battery cell group; and the puncturing part is connected with the supporting plate and / or the cold plate and used for puncturing the air isolation film, external airflow can flow to the heat preservation layer through the punctured position of the air isolation film, and the heat preservation layer expands when encountering air to fill the gap between the supporting plate and the cold plate.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery and an electrical device. Background Art

[0002] With the rapid expansion and development of the new energy market, the market share of new energy vehicles has gradually increased. As a result, people's requirements for the core components of new energy vehicles - power batteries are getting higher and higher, such as requiring power batteries to have excellent endurance. Generally, a cold plate is set in the power battery to cool the power battery so that the power battery can meet people's demand for endurance.

[0003] When assembling the power battery, the cold plate is installed on the shell, and the battery cells in the shell are in contact with the cold plate. There is a flow channel in the cold plate, and the refrigerant can exchange heat with the battery cells when circulating in the flow channel to control the temperature of the battery cells.

[0004] In traditional technology, due to the lack of necessary insulation measures, the cold in the cold plate is easily transferred to the shell and dissipated, resulting in poor cooling ability of the battery cell, and thus poor thermal management performance of the power battery. Utility Model Content

[0005] Based on this, it is necessary to provide a battery and an electrical device to address the above problems, reduce the dissipation of cold in the cold plate, and thereby improve the thermal management performance of the power battery.

[0006] A battery comprising:

[0007] Support plate;

[0008] Cold plate;

[0009] A first vacuum filling member is disposed between the support plate and the cold plate; the first vacuum filling member comprises a heat-insulating layer and a gas-isolating film covering an outer surface of the heat-insulating layer;

[0010] A battery cell group, in contact with a side of the cold plate away from the support plate for heat exchange, the cold plate being used to cool the battery cell group;

[0011] The puncture portion is connected to the support plate and / or the cold plate and is used to puncture the air barrier film. External airflow can flow to the insulation layer through the punctured position of the air barrier film. The insulation layer expands when encountering air and fills the gap between the support plate and the cold plate.

[0012] In one of the embodiments, at least one of the piercing portions is protruding from a side of the support plate facing the cold plate and is integrally formed with the support plate.

[0013] In one embodiment, there is a first spacing between the surface of the support plate facing the cold plate and the gas barrier film adjacent thereto, and a second spacing between the mutually facing surfaces of the support plate and the cold plate;

[0014] The height by which the puncturing portion protrudes from the support plate is greater than the first spacing and less than the second spacing.

[0015] In one embodiment, the battery further includes a fixing screw, and at least one of the puncturing portions is formed at the top end of the fixing screw;

[0016] The top end of the fixing screw sequentially passes through the support plate, the first vacuum filling member, and the cold plate to fix the three.

[0017] In one embodiment, the heat insulation layer has a through hole at a position facing the puncturing portion, and air flow can be filled into the through hole through the gas barrier film.

[0018] In one embodiment, the battery further includes a housing, the housing is connected to the support plate, and the battery cell group is press-fitted and installed in an installation space formed by enclosing the support plate and the housing;

[0019] The battery further includes a second vacuum filling member, and the second vacuum filling member is disposed between the battery cell group and the side wall of the housing.

[0020] In one embodiment, the structure of the second vacuum filling member is the same as that of the first vacuum filling member; when the second vacuum filling member is damaged, the second vacuum filling member expands upon encountering gas to fill the gap between the battery cell group and the housing.

[0021] In one embodiment, the battery further includes a heating film and a thermal conductive adhesive layer, the heating film is used to exchange heat with the battery cell group to heat the battery cell group, and the heating film is connected to the battery cell group through the thermal conductive adhesive layer.

[0022] In one embodiment, the heating film is disposed between two groups of the battery cell groups;

[0023] The heating film includes a heating chip and an epoxy resin board, and the heating chip is disposed between the epoxy resin boards.

[0024] An electrical device includes the battery as described above.

[0025] In the above-mentioned battery and power-consuming device, the first vacuum filling member is disposed between the support plate and the cold plate, and the first vacuum filling member includes a heat-insulating layer. The heat-insulating layer can expand when encountering air and fill the gap between the support plate and the cold plate. In this way, under the action of the heat-insulating layer, the cold in the cold plate is not easily conducted to the support plate and then conducted to the outside through the support plate. Compared with the prior art lacking necessary heat-insulating measures, the ability of the cold plate to cool the battery cell group is improved, thereby improving the thermal management performance of the battery. Moreover, the heat-insulating layer can completely fill the gap between the support plate and the cold plate when expanding upon encountering air, playing a role in supporting the cold plate and meeting the structural strength requirements. At the same time, since the puncturing portion can puncture the air-separating film, during the assembly process of the battery, the first vacuum filling member can be assembled between the support plate and the cold plate without tearing off the air-separating film, and then the air-separating film is punctured through the puncturing portion to allow air to flow to the heat-insulating layer, and the heat-insulating layer fills the gap between the support plate and the cold plate. Compared with the method of tearing off the air-separating film and then assembling the heat-insulating layer between the support plate and the cold plate (tearing off the air-separating film, the heat-insulating layer expands upon encountering air and its thickness increases), the heat-insulating layer can be assembled between the support plate and the cold plate when its thickness is relatively thin before expansion, facilitating the assembly of the support plate and the cold plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The structural diagram of a battery provided by an embodiment of the present application;

[0027] Figure 2 is Figure 1 the exploded view of the battery shown in

[0028] Figure 3 is Figure 1 the structural diagram of a partial structure of the battery shown in

[0029] Figure 4 is Figure 3 the enlarged view at B of the structure shown in

[0030] Figure 5 is Figure 1 the structural diagram of a partial structure of the battery shown in

[0031] Figure 6 is Figure 1 the cross-sectional view of a partial structure of the battery shown in

[0032] Figure 7 is Figure 6 the enlarged view at A of the structure shown in

[0033] Figure 8 is Figure 1 the structural diagram of a partial structure of the battery shown in

[0034] Figure 9 is Figure 1 the exploded view of the heating film of the battery shown in

[0035] Figure 10 is Figure 9 The structural diagram of the heating chip of the heating film shown in

[0036] Explanation of the reference numerals in the drawings:

[0037] 100. Battery; 10. Support plate; 20. Cold plate; 30. First vacuum filling member; 31. Heat insulation layer; 311. Through hole; 32. Gas barrier film; 40. Battery cell group; 50. Piercing part; 60. Fixing screw; 70. Outer shell; 71. Housing; 72. Cover plate; 80. Second vacuum filling member; 90. Heating film; 91. Heating chip; 92. Epoxy resin board; 110. Thermal conductive adhesive layer. Specific embodiments

[0038] In order to make the above objects, features and advantages of the present utility model more obvious and understandable, the following will describe the specific embodiments of the present utility model in detail with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present utility model. However, the present utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0039] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0040] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0041] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "linkage", "fixation" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the internal communication between two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0042] In the present utility model, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0043] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0044] Referring to Figure 1 and Figure 2 , an embodiment of the present application provides a battery 100, including a support plate 10, a cold plate 20 and a battery cell group 40. The support plate 10 is disposed on one side of the cold plate 20 and connected to the cold plate 20. The battery cell group 40 is disposed on the side of the cold plate 20 facing away from the support plate 10, and the battery cell group 40 exchanges heat with the cold plate 20, and the cold plate 20 is used to cool the battery cell group 40. Among them, the battery cell group 40 includes a plurality of battery cells, and the battery cells are not limited and can adopt a ternary NCM system or an LFP system, and the size can be made according to needs.

[0045] Optionally, a flow channel for the refrigerant to flow is provided in the cold plate 20. When the refrigerant in the cooling system flows through the flow channel, it can exchange heat with the battery cell group 40 through the cold plate 20 to cool the battery cell group 40. It can be understood that in some other embodiments, the cold plate 20 can omit the flow channel and adopt other methods to cool the battery cell group 40, which is not limited herein.

[0046] Referring toFigure 2 and Figure 3 The battery 100 further includes a first vacuum filling member 30 and a puncturing portion 50. The first vacuum filling member 30 is disposed between the support plate 10 and the cold plate 20, and the first vacuum filling member 30 includes a heat insulation layer 31 and a gas barrier film 32 covering the outer surface of the heat insulation layer 31. The puncturing portion 50 is connected to the support plate 10 and / or the cold plate 20 and is used for puncturing the gas barrier film 32, so that the external air flow can flow to the heat insulation layer 31 through the punctured position of the gas barrier film 32, and the heat insulation layer 31 expands upon contact with air and fills the gap between the support plate 10 and the cold plate 20.

[0047] It should be noted here that the connection of the puncturing portion 50 to the support plate 10 and / or the cold plate 20 includes the following three cases:

[0048] 1. The puncturing portion 50 is directly connected to the support plate 10, and there is no direct connection relationship between the puncturing portion 50 and the cold plate 20;

[0049] 2. The puncturing portion 50 is directly connected to the cold plate 20, and there is no direct connection relationship between the puncturing portion 50 and the support plate 10;

[0050] 3. The puncturing portion 50 is directly connected to both the support plate 10 and the cold plate 20.

[0051] In the battery 100 provided by the embodiment of the present application, the first vacuum filling member 30 is disposed between the support plate 10 and the cold plate 20, and the first vacuum filling member 30 includes a heat insulation layer 31. The heat insulation layer 31 can expand upon contact with air and fill the gap between the support plate 10 and the cold plate 20. In this way, under the action of the heat insulation layer 31, the cold in the cold plate 20 is not easily conducted to the support plate 10 and then conducted to the outside through the support plate 10. Compared with the prior art lacking necessary heat insulation measures, the ability of the cold plate 20 to cool the battery cell group 40 is improved, thereby improving the thermal management performance of the battery 100. Moreover, the heat insulation layer 31 can completely fill the gap between the support plate 10 and the cold plate 20 upon expansion, playing a role in supporting the cold plate 20 and meeting the structural strength requirements. At the same time, since the puncturing portion 50 can puncture the gas barrier film 32, during the assembly process of the battery 100, the first vacuum filling member 30 can be assembled between the support plate 10 and the cold plate 20 without tearing off the gas barrier film 32, and then the gas barrier film 32 is punctured by the puncturing portion 50 to allow air to flow to the heat insulation layer 31, and the heat insulation layer 31 fills the gap between the support plate 10 and the cold plate 20. Compared with the method of tearing off the gas barrier film 32 and then assembling the heat insulation layer 31 between the support plate 10 and the cold plate 20 (tearing off the gas barrier film 32, the heat insulation layer 31 expands upon contact with air and the thickness increases), the heat insulation layer 31 can be assembled between the support plate 10 and the cold plate 20 when the thickness is relatively thin before expansion, which is convenient for the assembly of the support plate 10 and the cold plate 20.

[0052] In some embodiments, the support plate 10 is formed by sheet metal stamping. The support plate 10 is the bottom plate of the battery 100, which plays a role in supporting and protecting the cold plate 20 to prevent damage to the cold plate 20 and the battery cells caused by sand or hard objects at the bottom during driving. Of course, in some other embodiments, the support plate 10 can also be a plate at other positions of the battery 100, such as the top plate, and the position of the support plate 10 can be adaptively changed according to the change of the position of the cold plate 20.

[0053] Optionally, the cold plate 20 is formed by stamping and welding three-series aluminum. Since the working pressure of the refrigerant in the cooling system is relatively high, the width of the flow channel is generally set at about 10 mm, which can reduce the pressure drop and prevent the refrigerant from overheating prematurely in the cold plate 20 while meeting the working pressure of the cooling system.

[0054] It should be understood that in some other embodiments, there are no restrictions on the forming processes of the support plate 10 and the cold plate 20. At the same time, there are also no restrictions on the width of the flow channel in the cold plate 20, and it can also be greater than 10 mm or less than 10 mm.

[0055] In some embodiments, the thermal insulation layer 31 is a foam layer. When the foam layer is wrapped with the gas barrier film 32, the foam layer is in a vacuum state, and when the gas barrier film 32 is punctured, the foam expands when it encounters air. Optionally, the foam is made of polyurethane. Of course, in some other embodiments, there are no restrictions on the type of the thermal insulation layer 31, as long as it can be set to expand when encountering air.

[0056] Furthermore, the gas barrier film 32 is a plastic-sealed film, which can be attached to the thermal insulation layer 31 to achieve a better wrapping effect. Of course, in some other embodiments, there are no restrictions on the gas barrier film 32, as long as it can achieve the effect of isolating air.

[0057] In some embodiments, referring to Figures 3 - 5 , at least one puncturing portion 50 protrudes from the side of the support plate 10 facing the cold plate 20 and is integrally formed with the support plate 10. That is, in this case, the puncturing portion 50 is a sharp convex platform structure integrally formed on the surface of the support plate 10. Since the first vacuum filling member 30 is assembled between the support plate 10 and the cold plate 20, during the assembly of the support plate 10, the puncturing portion 50 integrally formed with the support plate 10 can puncture the gas barrier film 32 so that the gas flows to the thermal insulation layer 31, and the thermal insulation layer 31 can expand when encountering air to fill the gap between the support plate 10 and the cold plate 20, making the assembly quick and convenient.

[0058] Furthermore, a plurality of puncturing portions 50 are integrally formed on the support plate 10. During assembly, the puncturing portions 50 integrally formed with the support plate 10 puncture the gas barrier film 32 from multiple different positions, which speeds up the rate of gas flowing to the thermal insulation layer 31, thereby accelerating the expansion rate of the thermal insulation layer 31 and ensuring the thermal insulation and support effects of the thermal insulation layer 31.

[0059] It should be noted that the puncturing part 50 protruding from the support plate 10 needs to avoid the flow channel of the cold plate 20, and the height of the puncturing part 50 protruding from the support plate 10 should ensure that the air isolation film 32 can be punctured without damaging the cold plate 20.

[0060] In some embodiments, there is a first distance between the surface of the support plate 10 facing the cold plate 20 and the air isolation film 32 close to it, and a second distance between the surfaces of the support plate 10 and the cold plate 20 facing each other. The height of the puncturing part 50 protruding from the support plate 10 is greater than the first distance and less than the second distance. In this way, it is ensured that the puncturing part 50 can puncture the air isolation film 32 without damaging the cold plate 20.

[0061] Here, it should be noted that the first distance is the distance between the surface of the support plate 10 facing the cold plate 20 and the air isolation film 32 close to it when the first vacuum filling member 30 is initially assembled between the support plate 10 and the cold plate 20 and has not expanded, and the second distance is the preset distance between the support plate 10 and the cold plate 20. In some specific embodiments, during assembly, the first vacuum filling member 30 is pasted onto the support plate 10, and at this time the first distance is 0. In other specific embodiments, during assembly, the first vacuum filling member 30 is pasted onto the cold plate 20, and at this time the first distance is greater than 0.

[0062] Here, it should be noted that since the puncturing part 50 is opposite to the position of the cold plate 20 where there is no flow channel, the second distance is the distance between the surfaces of the support plate 10 and the cold plate 20 in the area where there is no flow channel.

[0063] Here, it also should be noted that in practical applications, when choosing the height of the puncturing part 50 protruding from the support plate 10, the flatness of the support plate 10 and the cold plate 20, the thickness tolerance of the heat insulation layer 31, the target stress requirement for the heat insulation layer 31 and other factors also need to be considered.

[0064] In a specific embodiment, the second spacing is 8 mm, the flatness of the cold plate 20 after installation is ≤1 mm, and the flatness of the support plate 10 after installation is ≤0.5 mm. The thermal insulation layer 31 is a foam layer. After being vacuum compressed, the foam is compressed by 30%. When air re-enters the foam, the foam begins to expand. After the expansion is completed, the thickness loss rate is about 3%. Considering the support and expansion requirements of the foam layer, the target stress that the foam layer needs to have is 30 Kpa. It can be seen from the stress-strain curve that the thickness that the foam layer needs to be compressed is 35%. Moreover, the thickness of the plastic film is selected to be 0.15 mm. There are two layers of plastic films between the support plate 10 and the cold plate 20, one layer is between the cold plate 20 and the foam layer, and the other layer is between the support plate 10 and the foam layer. Then the thickness of the compressed foam layer is: (8 - 0.15×2)÷97%×30%÷35% = 6.8 mm. Then the thickness of the entire first vacuum filling member 30 is 6.8 + 0.15×2 = 7.1 mm. The thickness tolerance of the foam layer is set to be ±0.5 mm. If the second spacing between the support plate 10 and the cold plate 20 has a limit positive deviation, it is 8 + 1 + 0.5 = 9.5 mm. If the foam layer has a negative deviation, it is 7.1 - 0.5 = 6.6 mm. Then the height of the puncturing portion 50 protruding from the surface of the support plate 10 needs to be greater than 9.5 - 6.6 = 2.9 mm to puncture the plastic film so that air can flow to the foam layer. If the second spacing between the support plate 10 and the cold plate 20 has a limit negative deviation, it is 8.1 - 0.5 = 6.5 mm. Then, to ensure that the puncturing portion 50 does not contact the cold plate 20, the height of the puncturing portion 50 needs to be less than 6.5 mm. In summary, it is more reasonable to select the height of the puncturing portion 50 protruding from the support plate 10 to be between 2.9 mm and 6.5 mm.

[0065] In other embodiments, refer to Figure 6 and Figure 7 , the battery 100 further includes a fixing screw 60, and at least one puncturing portion 50 is formed at the top end of the fixing screw 60. The top end of the fixing screw 60 sequentially passes through the support plate 10, the first vacuum filling member 30 and the cold plate 20 to fix the three.

[0066] That is, in the above case, a sharp corner design is added to the top end of the fixing screw 60, and this sharp corner design forms the puncturing portion 50. After the first vacuum filling member 30 is assembled between the support plate 10 and the cold plate 20, when the fixing screw 60 passes through the support plate 10, the first vacuum filling member 30 and the cold plate 20 to fix the three, the gas barrier film 32 is punctured. When the gas barrier film 32 is punctured, external air flows to the thermal insulation layer 31 through the punctured position of the gas barrier film 32, and the thermal insulation layer 31 expands upon encountering air and fills the space between the support plate 10 and the cold plate 20. By directly forming the puncturing portion 50 at the top end of the fixing screw 60 in this way, the structure of the battery 100 can be simplified.

[0067] Furthermore, the battery 100 includes a plurality of fixing screws 60, and a piercing portion 50 is formed at the top end of each fixing screw 60. On the one hand, the support plate 10, the first vacuum filling member 30, and the cold plate 20 are fixed by the plurality of fixing screws 60, ensuring the fixing effect; on the other hand, the piercing portions 50 at the top ends of the plurality of fixing screws 60 can pierce the gas barrier film 32 from multiple different positions, enabling air to enter the heat preservation layer 31 through multiple different parts, increasing the air intake speed, and enabling the heat preservation layer 31 to quickly fill the gap between the support plate 10 and the cold plate 20.

[0068] To ensure the piercing effect of piercing the gas barrier film 32, generally, in addition to the piercing portion 50 being integrally formed on the support plate 10, a piercing portion 50 is also formed at the top end of the fixing screw 60, that is, the gas barrier film 32 is pierced by the combination of the above two settings.

[0069] In some embodiments, referring to Figure 8 , at the position of the heat preservation layer 31 facing the piercing portion 50, there is a through hole 311, and air flow can be filled into the through hole 311 through the gas barrier film 32. In this way, when the gas barrier film 32 is pierced, the outside air can fill the through hole 311 through the pierced position thereof and flow to other parts of the heat preservation layer 31 through the through hole 311, which can increase the air intake rate of the gas entering the heat preservation layer 31 and enable the heat preservation layer 31 to quickly fill the gap between the support plate 10 and the cold plate 20.

[0070] It should be noted here that the through hole 311 is a hole that penetrates the heat preservation layer 31 in the thickness direction of the heat preservation layer 31. The through hole 311 can be a round hole, a square hole, or a hole with a notch located at the edge of the heat preservation layer 31, which is not limited herein.

[0071] Continuing to refer to Figure 1 and Figure 2 , the battery 100 further includes a housing 70. The housing 70 is connected to the support plate 10, and the battery cell group 40 is press-fitted and installed in the installation space formed by enclosing the support plate 10 and the housing 70. The method of directly pressing the battery cell group 40 into the box can improve the volume utilization rate and energy density of the battery 100 compared with the traditional method of putting the battery module into the box, thereby increasing the overall battery capacity and improving the vehicle's energy storage mileage.

[0072] It should be understood that in some other embodiments, the battery 100 can also be a battery 100 with modules, which is not limited herein.

[0073] In some embodiments, the housing 70 includes a housing body 71 and a cover plate 72. The housing body 71 is connected to the support plate 10, and the cover plate 72 is disposed at one end of the housing body 71 away from the support plate 10. Specifically, the support plate 10 serves as the bottom plate of the battery 100, the cover plate 72 serves as the top plate of the battery 100, and the housing body 71 is located between the bottom plate and the top plate. It should be understood that in some other embodiments, the positions of the support plate 10 and the cover plate 72 in the battery 100 are not limited. For example, in some other embodiments, the support plate 10 can also be the top plate of the battery 100, and the cover plate 72 serves as the bottom plate of the battery 100.

[0074] In some specific embodiments, the housing body 71 is formed by traditional 6-series aluminum extrusion. Its main function is to protect the battery cells, while meeting the requirements of light weight and improving the structural strength of the whole battery pack. The cover plate 72 can be prepared from sheet metal, SMC composite material or PCM composite material, with a size of 0.8 - 1.2 mm, which can be specifically adjusted according to the internal space of the battery 100. The cover plate 72 can ensure the sealing of the housing body 71 and can be assembled with the housing body 71 by means of bolt fixation to ensure that the battery cells are not exposed and to provide a certain structural strength to the battery 100. Of course, in some other specific embodiments, the materials of the housing body 71 and the cover plate 72, the size of the cover plate 72, and the assembly method of the housing body 71 and the cover plate 72 are not limited either.

[0075] The housing body 71 includes a frame body and a connecting plate. The connecting plate is disposed inside the frame body, and both ends of the connecting plate are connected to the two side plates of the frame body respectively. The cold plate 20 is disposed between the support plate 10 and the frame body, and the battery cell group 40 is squeezed and disposed inside the frame body. The cold plate 20 and the frame body can be fixed and sealed by means of flow drill screw tightening (FDS) process or by friction stir welding. The fixing screw 60 passes through the support plate 10, the first vacuum filling member 30, the cold plate 20 and the connecting plate to fix the four of them.

[0076] It should be understood that in some other embodiments, the housing body 71 can also be arranged in other ways. For example, in one embodiment, the connecting plate can be omitted. At this time, the fixing screw 60 passes through the support plate, the first vacuum filling member 30 and the cold plate 20 and fixes the three of them.

[0077] In some embodiments, referring to Figure 2 still, the battery 100 further includes a second vacuum filling member 80, and the second vacuum filling member 80 is disposed between the battery cell group 40 and the side wall of the housing body 71.

[0078] Since the battery cell group 40 is inserted into the housing by extrusion, which is different from the traditional solution, over-extrusion into the housing requires the equipment jaws to extrude the battery cell to a certain size, which needs to be smaller than the size of the placement area of the battery cell housing 71 for placing the battery cell. After the battery cell is inserted into the housing, the equipment releases the jaws, and the battery cell expands within the housing 71 until the battery cell no longer undergoes obvious displacement, indicating that the battery cell insertion into the housing is completed. Generally, after the battery cell is inserted into the housing, there is a certain distance between the side of the battery cell and the side wall of the housing 71. By filling a second vacuum filling member 80 between the side walls of the housing 71 of the battery cell group 40, it is possible to improve the overall package mode while reducing the heat transfer between the side wall of the housing 71 and the battery cell.

[0079] The structure of the second vacuum filling member 80 is the same as that of the first vacuum filling member 30. When the second vacuum filling member 80 is damaged, the second vacuum filling member 80 expands upon contact with air and fills the gap between the battery cell group 40 and the housing 71. Generally, a tear position is provided on the air isolation film 32 of the second vacuum filling member 80. After the second vacuum filling member 80 is assembled between the side walls of the battery cell group 40 and the housing 71 (the second vacuum filling member 80 can be pasted to the battery cell group 40 or the housing 71 by means of the back glue of the air isolation film 32), the air isolation film 32 is torn along the tear position, air enters the heat preservation layer 31, and the heat preservation layer 31 gradually expands to its original thickness, so that the heat preservation layer 31 can fill the gap between the side walls of the battery cell group 40 and the housing 71.

[0080] In some specific embodiments, the heat preservation layer 31 of the second vacuum filling member 80 is also a foam layer, and the foam layer is made of polyurethane. After vacuum compression, the foam is compressed by 30%. When air re-enters the foam, the foam begins to expand. After the expansion is completed, the thickness loss rate is about 3%. If the distance between the side of the battery cell group 40 and the housing 71 is 29.3 mm and the thickness of a single-layer air isolation film 32 is selected to be 0.15 mm, the thickness of the foam layer required is 29.3 - 0.15×2 = 29 mm. Considering that the thickness loss of the foam layer after compression and then expansion is about 3%, the thickness of the foam layer after compression must reach 29÷97%×30% = 9 mm to fill the gap between the battery cell group 40 and the housing 71. If considering the support force that the foam layer needs to provide to the battery cell and the housing 71, the required stress can be deduced from the simulation results. In this patent, the required stress is set at 30 kPa. From the stress-strain curve, it can be known that the thickness of the foam layer that needs to be compressed is 35%. Therefore, the thickness of the foam layer after compression should be: (29.3 - 0.15×2)÷97%×30%÷35% = 25.6 mm. The thickness of the foam layer with the plastic sealing film after compression is 25.6 + 0.15×2 = 25.9 mm. 25.9 mm is much smaller than 29.3 mm, which can make the second vacuum filling member 80 after vacuum compression be easily placed between the battery cell group 40 and the side wall of the housing 71, meeting the assembly and use requirements.

[0081] In some embodiments, continue to refer to Figure 2, the battery 100 further includes a heating film 90, which is used to exchange heat with the battery cell group 40 to heat the battery cell group 40. In this way, the battery 100 can better meet the thermal management requirements through the cooperation of the cold plate 20 and the heating film 90.

[0082] Optionally, the battery 100 includes multiple groups of battery cell groups 40, and the heating film 90 is arranged between two adjacent groups of battery cell groups 40. Specifically, each battery cell group 40 is arranged in sequence along the length direction of the battery cell, and each battery cell group 40 includes multiple battery cells in the thickness direction of the battery cell, and a heating film 90 is arranged between every two adjacent battery cell groups 40. In some specific embodiments, the battery 100 has 4 groups of battery cell groups 40, the heating film 90 has 3 rows, and a row of heating film 90 is arranged between every two adjacent battery cell groups 40.

[0083] Of course, in some other embodiments, the setting position of the heating film 90 is not limited. For example, the heating film 90 can also be arranged between the battery cell group 40 and the housing 71.

[0084] When the heating film 90 is arranged between two battery cell groups 40, the battery cells are compressed by force and the overall size becomes smaller. The heating film 90 on the side of the battery cells will be subject to the friction force caused by the compression of the battery cells. In this process, conventional heating films 90, such as PI heating films (formed by covering a heating core with two layers of polyimide films and heat-pressed at high temperature, with low cost, fast heating rate but poor temperature uniformity, low temperature resistance, but easy to be scratched and cause leakage) or silicone heating films (formed by covering a heating core with two layers of high thermal conductivity silicone cloth and heat-pressed at high temperature, the surface of the heating film is silicone rubber cloth, which is easy to be punctured or torn and damaged, resulting in breakage and posing a safety hazard), cannot withstand the change in the compressed size of the battery cells and will be torn, resulting in open circuit or local short circuit, posing a greater safety hazard.

[0085] In some embodiments, referring to Figure 9 , the heating film 90 includes a heating chip 91 and an epoxy resin board 92, and the heating chip 91 is arranged between the epoxy resin boards 92. Since the epoxy resin board 92 is a hard material with strong structural strength, the epoxy resin board 92 on the surface of the heating film 90 will not be damaged due to force, and can play a good protective role for the heating chip 91 inside the heating film 90, thus fundamentally avoiding the damage of the heating film 90.

[0086] The heating chip 91 has a metal heating wire, such as a nickel-chromium alloy electric heating wire. The rigid electric heating film element formed by the epoxy resin board 92 and the metal heating wire assembly has the characteristics of high temperature resistance, high thermal conductivity, flame retardancy, good insulation performance, fast heating, high thermal efficiency, convenient use, high safety performance, and not easy to age.

[0087] In a specific embodiment, the thickness of the epoxy resin boards 92 on both sides of the heating chip 91 is 0.2 mm - 2 mm, and the heating chip 91 is a nickel-chromium alloy sheet or a copper foil with a thickness of 0.03 - 0.1 mm. Of course, in some other embodiments, the thicknesses of the epoxy resin board 92 and the heating chip 91 are not limited, and the material of the heating chip 91 is also not limited.

[0088] Continue to refer to Figure 2 , the battery 100 further includes a thermal conductive adhesive layer 110, and the heating film 90 is connected to the battery cells of the battery cell group 40 through the thermal conductive adhesive layer 110. Since the thermal conductive adhesive has good coating properties, the battery cells can be completely connected to the heating film 90 through the thermal conductive adhesive, ensuring the connection effect between the heating film 90 and the battery cells; at the same time, the heat of the heating chip 91 in the heating film 90 can be completely transferred to the battery cells through the thermal conductive adhesive layer 110, and the problem of dry burning of the heating film 90 will not occur.

[0089] During the stacking process of the battery cells, thermal conductive adhesive is applied on the surface of the heating film 90. Generally, the surface curing time of the thermal conductive adhesive is about 30 minutes, which means that there is an operation time of 30 minutes from when the thermal conductive adhesive is applied on the surface of the heating film 90 to when the battery cells are completely put into the shell, which is sufficient for production and manufacturing in the trial production stage or the mass production stage.

[0090] Furthermore, the heating chip 91 adopts an anti-pulling design, so as to achieve double fracture protection together with the epoxy resin board 92.

[0091] During the charging and discharging process of the battery cells, the thickness of the battery cells will change. The battery cells will expand during the charging process, and expand outward in the left-right direction corresponding to Figure 10 , and there is a certain shrinkage during the discharging process of the battery cells, and the shrinkage direction is opposite to the expansion direction, and shrinks inward in the left-right direction corresponding to Figure 10 . Therefore, during the charging and discharging process of the battery cells, a pulling force will be applied to the heating film along the left-right direction in Figure 10 , that is, the heating film will be pulled along the length direction of the heating film. To counteract the above-mentioned pulling, the anti-pulling design adopts the following method: the heating wire of the heating chip 91 is designed in sections in the thickness direction of the battery cell, that is, the heating chip 91 includes multiple heating wire segments 911 along the thickness direction of the battery cell, and two adjacent heating wire segments 911 are connected. The segmented design of the heating wire can make the pulled size of the heating chip 91 evenly distributed to each heating wire segment 911, and the pulling distance is relatively small. At the same time, in the thickness direction of the battery cell, the size of the connected part of the heating wire segments 91 is larger than that of the non-connected part, so that the connected part has a higher structural strength and stronger anti-pulling ability.

[0092] Another embodiment of the present application further provides an electrical device, including the above-mentioned battery 100. Optionally, the electrical device is a vehicle, which can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc.

[0093] It should be noted that for a pure electric vehicle, the above-mentioned battery 100 can be used as a driving power source to replace fossil fuels and provide driving power.

[0094] In some other embodiments, the type of the electrical device is not limited. For example, the electrical device can also be a ship, a spacecraft, an electric toy, an electric tool, an energy storage device, a amusement device, an elevator, a lifting device, etc. The spacecraft includes an airplane, a rocket, a space shuttle, a spaceship, etc.; the electric toy includes a stationary or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, or an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and a railway electric tool, for example, an electric drill, an electric grinding wheel, an electric wrench, an electric screwdriver, a hammer drill, an impact electric drill, a concrete vibrator, and an electric planer, etc.; the energy storage device can be an energy storage wall, a base station energy storage, a container energy storage, etc.; the amusement device can be a carousel, a drop tower, etc. The present application does not impose special restrictions on the above-mentioned electrical devices.

[0095] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0096] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the utility model patent shall be subject to the appended claims.

Claims

1. A battery, characterized in that: include: Support plate (10); Cold plate (20); A first vacuum filling member (30) is disposed between the support plate (10) and the cold plate (20); the first vacuum filling member (30) comprises a heat-insulating layer (31) and a gas-isolating film (32) covering the outer surface of the heat-insulating layer (31); A battery cell group (40) contacts and exchanges heat with a side of the cold plate (20) facing away from the support plate (10), the cold plate (20) being used to cool the battery cell group (40); The puncturing portion (50) is connected to the support plate (10) and / or the cold plate (20) and is used to puncture the air barrier film (32), so that external air flow can flow to the thermal insulation layer (31) through the punctured position of the air barrier film (32), and the thermal insulation layer (31) expands when encountering air to fill the gap between the support plate (10) and the cold plate (20).

2. The battery according to claim 1, characterized in that At least one of the piercing portions (50) is protruding from a side of the support plate (10) facing the cold plate (20), and is integrally formed with the support plate (10).

3. The battery according to claim 2, characterized in that There is a first distance between the surface of the support plate (10) facing the cold plate (20) and the air barrier film (32) close thereto, and there is a second distance between the surfaces of the support plate (10) and the cold plate (20) facing each other; The height of the piercing portion (50) protruding from the support plate (10) is greater than the first spacing and less than the second spacing.

4. The battery according to claim 1, characterized in that The battery further comprises a fixing screw (60), and at least one of the piercing portions (50) is formed at a top end of the fixing screw (60); The top end of the fixing screw (60) passes through the supporting plate (10), the first vacuum filling member (30) and the cold plate (20) in sequence to fix the three.

5. The battery according to claim 1, characterized in that The heat-insulating layer (31) has a through hole (311) at a position directly opposite to the puncturing portion (50), and air flow can be filled into the through hole (311) through the air barrier film (32).

6. The battery according to any one of claims 1 to 5, characterized in that: The battery further comprises a shell (70), the shell (70) being connected to the support plate (10), and the battery cell group (40) being extruded and installed in an installation space formed by the support plate (10) and the shell (70); The battery further comprises a second vacuum filling piece (80), wherein the second vacuum filling piece (80) is arranged between the battery cell group (40) and the side wall of the housing (70).

7. The battery according to claim 6, characterized in that The structure of the second vacuum filling piece (80) is the same as that of the first vacuum filling piece (30); when the second vacuum filling piece (80) is damaged, the second vacuum filling piece (80) expands when exposed to air to fill the gap between the battery cell group (40) and the housing (70).

8. The battery according to any one of claims 1 to 5, characterized in that: The battery further comprises a heating film (90) and a heat-conducting adhesive layer (110); the heating film (90) is used to exchange heat with the battery cell group (40) to heat the battery cell group (40); and the heating film (90) is connected to the battery cell group (40) via the heat-conducting adhesive layer (110).

9. The battery according to claim 8, characterized in that The heating film (90) is arranged between two groups of battery cell groups (40); The heating film (90) comprises a heating chip (91) and an epoxy resin plate (92), wherein the heating chip (91) is arranged between the epoxy resin plates (92).

10. An electrical device, characterized in that: Comprising a battery as claimed in any one of claims 1 to 9.

Images