Battery structure and assembling method thereof, and electric device

Abstract

The application discloses a battery structure, an assembling method thereof and an electric device. The battery structure comprises a shell, a pole core and an elastic body. The shell is provided with a mounting cavity. The pole core is arranged in the mounting cavity and is spaced from the cavity wall of the mounting cavity to form a gap. The elastic body is arranged in the gap. The elastic body is provided with an elastic cavity. The elastic cavity is filled with liquid. The elastic body fills the gap and abuts against the pole core and the cavity wall of the mounting cavity. The application aims to reduce the contact thermal resistance between the pole core and the shell in the battery structure.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a battery structure, an assembly method of the battery structure, and an electric device using the battery structure. Background Technology

[0002] In related technologies, a certain assembly gap is reserved between the battery core and the casing to facilitate the insertion of the core into the casing. However, after the core is installed in the casing, a gap still exists between the core and the casing, resulting in a large contact thermal resistance between the core and the casing. Summary of the Invention

[0003] The main objective of this invention is to provide a battery structure and its assembly method, as well as an electric device, which aims to reduce the contact thermal resistance between the electrode core and the casing in the battery structure.

[0004] To achieve the above objectives, the present invention proposes a battery structure, the battery structure comprising:

[0005] A housing, wherein the housing is provided with a mounting cavity;

[0006] An electrode core, wherein the electrode core is disposed within the mounting cavity and spaced from the cavity wall to form a gap; and

[0007] An elastomer is disposed within the gap. The elastomer has an elastic cavity for filling with liquid, so that the elastomer fills the gap and abuts against the cavity wall of the electrode core and the mounting cavity.

[0008] In one embodiment, the elastomer is made of at least one of PI, PA, PET, or aluminum-plastic film;

[0009] And / or, the elastomer is encapsulated using a thermoforming process to form the elastic cavity;

[0010] And / or, the wall thickness of the elastomer is 0.05 mm to 0.2 mm;

[0011] And / or, the liquid is an electrolyte or an insulating liquid.

[0012] In one embodiment, the side of the elastomer facing the electrode core is bonded to the outer wall of the electrode core by an adhesive layer;

[0013] Alternatively, the side of the elastomer facing the housing is bonded to the cavity wall of the mounting cavity via an adhesive layer.

[0014] In one embodiment, the adhesive layer is one of non-woven fabric substrate double-sided adhesive, substrate-free double-sided adhesive, and PET substrate double-sided adhesive;

[0015] And / or, the thickness of the adhesive layer is less than or equal to 0.1 mm.

[0016] In one embodiment, the elastomer is further provided with an inlet communicating with the elastic cavity, and the housing is provided with a liquid injection port corresponding to the inlet;

[0017] The battery structure also includes a sealing element, which is inserted into the injection port and seals the inlet.

[0018] In one embodiment, the elastomer is further provided with an exhaust port communicating with the elastic cavity, the housing is provided with an outlet port corresponding to the exhaust port, and the battery structure further includes a blocking member, which passes through the outlet port and seals the exhaust port.

[0019] In one embodiment, the sealing element is laser-welded to the injection port;

[0020] And / or, the sealing element is sealed and bonded to the inlet by an adhesive, wherein the adhesive is one of polyurethane, epoxy resin, and UV-curable adhesive;

[0021] And / or, the plug is laser-welded to the vent hole;

[0022] And / or, the plugging component is sealed and bonded to the vent hole by an adhesive, the adhesive being one of polyurethane, epoxy resin, or UV-curable adhesive.

[0023] In one embodiment, the elastomer includes a bottom and a side portion connected to the bottom, the side portion and the bottom enclosing a receiving groove, the electrode core being accommodated in the receiving groove, the bottom having a first elastic cavity, the side portion having a second elastic cavity, the first elastic cavity and the second elastic cavity communicating with each other to form the elastic cavity.

[0024] In one embodiment, the pole core is square, and the bottom is square; the side portion includes two, and the two side portions are connected to opposite sides of the bottom; or, the side portion includes four, and the four side portions are respectively connected to the four sides of the bottom; or, the side portion includes four, and the four side portions are connected end to end to form a square cylindrical structure, and one end of the four side portions is connected to the bottom.

[0025] Alternatively, the pole core may be cylindrical or elliptical, the bottom may be circular or elliptical, and the side may be arranged around the periphery of the bottom to form a circular or elliptical cylindrical shape.

[0026] In one embodiment, the housing includes:

[0027] The bottom shell has a mounting groove, and the pole core and the elastic body are disposed within the mounting groove; and

[0028] A cover plate that covers the opening of the mounting groove to enclose and form the mounting cavity.

[0029] The present invention also proposes an assembly method for the battery structure described above, the assembly method comprising:

[0030] A housing is provided, the housing comprising a bottom shell and a cover plate, the bottom shell having a mounting groove, and the cover plate having an injection port and a through port;

[0031] An elastomer is prepared having an elastic cavity and an inlet communicating with the elastic cavity;

[0032] Prepare an electrode core by attaching the elastomer to the outer wall of the electrode core;

[0033] The electrode core and the elastomer are installed into the mounting groove, with the electrode core spaced apart from the groove wall to form a gap, and the elastomer located within the gap;

[0034] The cover plate is welded and sealed to the bottom shell to cover the opening of the mounting groove, so that the injection port and the inlet are connected accordingly;

[0035] Electrolyte is injected into the electrode core through the inlet, and the inlet is then sealed.

[0036] Liquid is injected into the elastic cavity through the injection port and the inlet, causing the elastomer to expand to fill the gap and abut against the electrode core and the bottom shell, sealing the inlet and the injection port.

[0037] In one embodiment, prior to the step of welding and sealing the cover plate to the bottom shell, the method further includes:

[0038] The electrode core was tested;

[0039] The electrode core and connecting piece are welded together.

[0040] In one embodiment, before the step of inserting the electrode core and the elastomer into the mounting groove, the method further includes:

[0041] Negative pressure is applied to the elastomer through the inlet to purge the air from the elastic cavity;

[0042] The negative pressure is above 0.5 atmospheres.

[0043] In one embodiment, the step of injecting electrolyte into the electrode core through the port and sealing the port includes:

[0044] Electrolyte is injected into the electrode core through the port;

[0045] The battery structure was subjected to high-temperature aging.

[0046] Electrolyte is injected a second time into the electrode core through the port;

[0047] The opening is sealed by laser welding of aluminum sheet.

[0048] In one embodiment, the step of injecting liquid into the elastic cavity through the injection port and the inlet, causing the elastomer to expand to fill the gap and abut against the electrode core and the bottom shell includes:

[0049] Negative pressure is applied to the elastomer through the injection port and the inlet to purge the air from the elastic cavity;

[0050] Liquid is injected into the elastic cavity through the injection port and the inlet;

[0051] The amount of liquid injected into the elastic cavity is controlled according to the injection balance pressure or the gap volume.

[0052] Stop injecting fluid when the preset target value is reached;

[0053] The sealing element is inserted into the injection port and seals the inlet by laser welding or adhesive to seal the inlet and the injection port.

[0054] The injection equilibrium pressure is greater than 3% to 10% of atmospheric pressure.

[0055] The present invention also proposes an electric device, including a device body and the battery structure described above, wherein the battery structure is disposed on the device body and electrically connected to the device body.

[0056] The battery structure of this invention facilitates the installation, fixation, and protection of the electrode core by setting an installation cavity within the casing. Simultaneously, an elastomer is placed within the gap between the electrode core and the casing, and an elastic cavity is provided within the elastomer. Liquid is filled into the elastic cavity, causing the elastomer to expand and fill the gap, allowing the outer wall of the elastomer to abut against the electrode core and the cavity wall of the installation cavity. This significantly reduces the contact thermal resistance between the electrode core and the casing, allowing heat from the electrode core to be quickly transferred to the outer wall of the casing. This heat is then cooled and dissipated by a cooling device, extending the battery's lifespan. Attached Figure Description

[0057] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0058] Figure 1 This is a schematic diagram of the battery structure in one embodiment of the present invention;

[0059] Figure 2 This is an exploded view of the battery structure in one embodiment of the present invention;

[0060] Figure 3 This is a cross-sectional schematic diagram of the battery structure in one embodiment of the present invention;

[0061] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0062] Figure 5 This is a schematic diagram of the structure of an elastomer in one embodiment of the present invention;

[0063] Figure 6 for Figure 5 Enlarged view of point B in the middle;

[0064] Figure 7 for Figure 6 A cross-sectional schematic diagram;

[0065] Figure 8 This is a schematic diagram of the structure of the elastomer in another embodiment of the present invention;

[0066] Figure 9 for Figure 8 Enlarged view of point C in the middle;

[0067] Figure 10 This is a top view of the cover plate in another embodiment of the present invention.

[0068] Explanation of icon numbers:

[0069] 100 Battery structure 3 elastomer 1 case 31 elastic cavity 11 Mounting cavity 32 Entrance 12 bottom shell 33 Exhaust port 121 Mounting slot 34 bottom 13 cover plate 35 Side 131 Liquid injection port 36 sump 132 Vent 4 sealing components 133 Through 5 Blocking components 2 Extreme Core 6 adhesive layer 21 gap

[0070] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0071] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0072] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0073] Meanwhile, the meaning of "and / or" or "and / or" appearing throughout the text is that it includes three options. Taking "A and / or B" as an example, it includes option A, option B, or an option that satisfies both A and B.

[0074] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0075] In related technologies, a certain assembly gap is reserved between the battery core and the casing to facilitate the insertion of the core into the casing. However, after the core is installed in the casing, a gap still exists between the core and the casing, resulting in a large contact thermal resistance between the core and the casing.

[0076] Currently, the batteries used are usually prismatic batteries. For example, the length L of the battery is 150mm, the thermal conductivity is 15-20W / mk, the thickness D of the battery is 50mm, the thermal conductivity is 1W / mk, and the height h of the battery is 110mm, the thermal conductivity is 15-20W / mk. Usually, a solution is chosen to cool the bottom of the battery, thereby simplifying the thermal resistance network of the battery.

[0077] Normally, the gap d1 at the bottom of the battery is 0.5mm. Due to the gravity of the electrode core, the bottom gap will become smaller, and the gap on the side of the battery will be 1mm. At this time, the area thermal resistance R2 of the bottom gap (filled with gas inside the battery, estimated based on a 0.25mm gap of air) is approximately 0.0093m. 2 K / W, while the thermal resistance R1 of the electrode core body at the highest temperature at the top to the bottom is only about 0.0073m. 2 K / W, the bottom thermal resistance accounts for 56% of the battery's height-direction thermal resistance. Considering that the core also transfers heat to the cold plate through the large surface area and side casing, but is limited by the side area thermal resistance R3 of approximately 0.037m²,... 2 The thermal conductivity of the battery is only about 1 W / mk in the thickness direction, and the interfacial gap thermal resistance accounts for about 10-40% of the total heat transfer thermal resistance of the battery.

[0078] Meanwhile, in related technologies, due to the pre-reserved assembly gap between the electrode core and the casing, an insulating pad is placed at the bottom, which hinders the electrode core from dissipating heat to the external cold plate of the battery through the casing.

[0079] Based on the above concepts and problems, this invention proposes a battery structure 100. It is understood that battery structure 100 refers to a portion of the space in a cup, tank, or other container or composite container that contains an electrolyte solution and metal electrodes to generate current, and is a device capable of converting chemical energy into electrical energy. Battery structure 100 has a positive electrode and a negative electrode. With the advancement of technology, the term "battery" generally refers to a small device capable of generating electrical energy, such as a solar cell. According to the type of electrolyte, a battery can be an alkaline battery, such as an alkaline zinc-manganese battery; a battery can also be an acidic battery, such as a zinc-manganese dry cell battery; and a battery can also be an organic electrolyte battery, such as a lithium battery, etc., without limitation here.

[0080] In this embodiment, the battery structure 100 can be applied to electric devices, which can be various electronic devices, electric vehicles, or smart devices equipped with the battery structure 100, etc., and are not limited here.

[0081] Please refer to the reference. Figures 1 to 10 As shown, in this embodiment of the invention, the battery structure 100 includes a housing 1, an electrode core 2, and an elastomer 3. The housing 1 is provided with a mounting cavity 11, the electrode core 2 is disposed in the mounting cavity 11 and spaced from the cavity wall of the mounting cavity 11 to form a gap 21, the elastomer 3 is disposed in the gap 21, and the elastomer 3 is provided with an elastic cavity 31. The elastic cavity 31 is used to fill liquid so that the elastomer 3 fills the gap 21 and abuts against the electrode core 2 and the cavity wall of the mounting cavity 11.

[0082] In this embodiment, the housing 1 of the battery structure 100 is the outer shell structure of the battery structure 100, used to install, fix, and protect the electrode core 2. The electrode core 2 is used to convert chemical energy into electrical energy. In order to facilitate the use of the electrical energy generated by the electrode core 2 in electric devices, the housing 1 is provided with a positive electrode and a negative electrode, which pass through the housing 1 and are connected to the electrode core 2. It can be understood that the electrode core 2 is the main component of the battery structure 100 that generates electrical energy, and the specific structure can refer to the prior art, which is not limited here.

[0083] It should be noted that the housing 1 needs to encapsulate the electrode core 2 inside the housing 1, that is, the housing 1 has a mounting cavity 11, which can be a sealed cavity. In order to facilitate the smooth installation of the electrode core 2 into the housing 1 during the assembly process of the battery structure 100, the volume of the housing 1 is relatively larger than the volume of the electrode core 2, that is, the housing 1 has a reserved assembly gap, so that after the electrode core 2 is installed into the housing 1, there is a gap 21 between the outer wall of the electrode core 2 and the inner wall of the housing 1.

[0084] Because there is a gap 21 between the outer wall of the electrode core 2 and the inner wall of the housing 1, there is a large contact thermal resistance, which affects the service life of the battery structure 100. In this embodiment, an elastomer 3 is provided, and an elastic cavity 31 is provided in the elastomer 3. The elastomer 3 is installed in the gap 21 and the elastic cavity 31 is filled with liquid. After the elastomer 3 expands, it fills the gap 21, so that the expanded elastomer 3 abuts against the electrode core 2 and the cavity wall of the mounting cavity 11, thereby greatly reducing the contact thermal resistance between the electrode core 2 and the housing 1. In this way, the heat generated by the electrode core 2 can be quickly transferred to the housing 1 through the elastomer 3, and then the battery structure 100 can be cooled and dissipated by the external cooling device to improve the service life of the battery structure.

[0085] The battery structure 100 of the present invention provides an installation cavity 11 within the housing 1, thereby facilitating the installation, fixing, and protection of the electrode core 2 using the installation cavity 11. Simultaneously, an elastic body 3 is provided within the gap 21 formed between the electrode core 2 and the housing 1, and an elastic cavity 31 is provided within the elastic body 3. By filling the elastic cavity 31 of the elastic body 3 with liquid, the elastic body 3 expands and fills the gap 21, so that the outer wall of the elastic body 3 abuts against the electrode core 2 and the cavity wall of the installation cavity 11, thereby significantly reducing the contact thermal resistance between the electrode core 2 and the housing 1. In this way, the heat of the electrode core 2 can be quickly transferred to the outer wall of the housing 1, thereby cooling and dissipating heat through a cooling device to extend the service life of the battery structure 100.

[0086] In this embodiment, the housing 1 can be an aluminum housing. To prevent electrical conductivity between the electrode core 2 and the housing 1, the elastomer 3 can be made of an insulating material. It is understood that the elastomer 3 has elastic contraction properties or flexibility, such as an elastic film material. Optionally, the material of the elastomer 3 can be at least one of PI, PA, PET, or aluminum-plastic film. Thus, the elastomer 3 can be formed by processing PI, PA, PET, or aluminum-plastic film, so that the elastomer 3 can have both elastic contraction properties, flexibility, and insulating characteristics.

[0087] Optionally, the elastomer 3 is encapsulated using a thermoforming process to form an elastic cavity 31. It is understood that the elastomer 3 is made of a thin strip material with openings at both ends, formed into a thin strip structure with an elastic cavity 31 through thermoforming or adhesive bonding. In this embodiment, the liquid inside the elastic cavity 31 is an electrolyte or an insulating liquid. Optionally, the insulating liquid can be an insulating oil or a fluorinated liquid, etc., and is not limited thereto.

[0088] In this embodiment, to ensure that the liquid in the elastic cavity 31 does not leak out, the elastic cavity 31 of the elastomer 3, which is made of PI, PA, PET or aluminum-plastic film, is a cavity structure with sealing performance. It can be understood that in order for the elastomer 3 to be easily filled in the gap 21, the thickness of the elastomer 3 is less than the spacing of the gap 21 (that is, the distance from the outer wall of the electrode core 2 to the inner wall of the shell 1).

[0089] Optionally, the wall thickness of the elastomer 3 is 0.05 mm to 0.2 mm. It is understood that the wall thickness of the elastomer 3 is the wall thickness of one side of the elastomer 3, that is, the thickness between the outer wall of the elastomer 3 and the inner wall of the elastic cavity 31. Optionally, the wall thickness of the elastomer 3 can be 0.05 mm, 0.08 mm, 0.1 mm, 0.13 mm, 0.15 mm, 0.18 mm, 0.2 mm, etc., and is not limited here. In this embodiment, the spacing of the gap 21 can be selected as 0.5 mm to 1.5 mm.

[0090] To prevent the elastomer 3 from shifting or being improperly assembled during assembly, thus affecting its expansion effect, in one embodiment, the side of the elastomer 3 facing the electrode core 2 is bonded to the outer wall of the electrode core 2 via an adhesive layer 6.

[0091] Understandably, during the assembly process of the battery structure 100, the elastomer 3 is first bonded to the outer wall of the electrode core 2 via the adhesive layer 6, and then the electrode core 2 and the elastomer 3 are integrally installed in the mounting cavity 11 of the housing 1. Optionally, the adhesive layer 6 is one of non-woven fabric-based double-sided adhesive, substrate-free double-sided adhesive, or PET-based double-sided adhesive, and is not limited here. In this embodiment, the thickness of the adhesive layer 6 is less than or equal to 0.1 mm, and is not limited here.

[0092] Of course, in another embodiment, the side of the elastomer 3 facing the housing 1 is bonded to the cavity wall of the mounting cavity 11 by the adhesive layer 6. It is understood that during the assembly process of the battery structure 100, the elastomer 3 is first bonded to the cavity wall of the mounting cavity 11 by the adhesive layer 6, and then the electrode core 2 is installed in the mounting cavity 11 of the housing 1. Optionally, the adhesive layer 6 is one of non-woven fabric-based double-sided adhesive, substrate-free double-sided adhesive, or PET-based double-sided adhesive, and is not limited here. In this embodiment, the thickness of the adhesive layer 6 is less than or equal to 0.1 mm, and is not limited here.

[0093] In one embodiment, the elastomer 3 is further provided with an inlet 32 ​​communicating with the elastic cavity 31, and the housing 1 is provided with an injection port 131 corresponding to the inlet 32; the battery structure 100 also includes a sealing member 4, which is inserted into the injection port 131 and seals the inlet 32.

[0094] In this embodiment, as Figures 1 to 10As shown, by providing an inlet 32 ​​on the elastomer 3 and a corresponding injection port 131 on the housing 1, liquid can be conveniently injected into the elastic cavity 31 using the injection port 131 and the inlet 32. It is understood that the shape of the inlet 32 ​​can be the same as or different from the shape of the injection port 131. The size of the inlet 32 ​​can also be the same as or different from the size of the injection port 131.

[0095] Understandably, in order to seal the injection port 131 and the inlet 32, a sealing member 4 is provided, which is inserted into the injection port 131 and seals the inlet 32. It should be noted that the injection port 131 can be a through hole structure opened on the housing 1, or it can be an injection-molded structure or metal part embedded in the housing 1. The injection-molded structure or metal part has a cavity or channel communicating with the inlet 32, etc., and is not limited here.

[0096] In this embodiment, the housing 1 has a through-hole structure, which can be formed into a structural component by extrusion of aluminum. This structural component has a liquid injection port 131, which is embedded within the through-hole structure of the housing 1 and partially extends into the inlet 32. To seal the liquid injection port 131, a sealing component 4 is laser-welded to the port 131, thus improving the sealing effect at the port 131. To seal the inlet 32, the structural component and the inlet 32 ​​are sealed and bonded together with an adhesive, thus improving the sealing effect at the inlet 32. Optionally, the adhesive is one of polyurethane, epoxy resin, or UV-curable adhesive.

[0097] Of course, in another embodiment, the injection port 131 is a through-hole structure formed on the housing 1, and one end of the sealing member 4 passes through the injection port 131 and extends into the inlet 32. In order to seal the inlet 32, the sealing member 4 and the inlet 32 ​​are sealed and bonded with an adhesive, which can improve the sealing effect at the inlet 32. Optionally, the adhesive is one of polyurethane, epoxy resin, and UV-curable adhesive.

[0098] To improve the injection speed and efficiency into the elastomer 3, the elastomer 3 is provided with multiple inlets 32, and the housing 1 is provided with multiple injection ports 131 corresponding to the multiple inlets 32. Multiple sealing components 4 are included, and each sealing component 4 is configured in a one-to-one correspondence with an injection port 131. Alternatively, the injection port 131 can be configured as a strip-shaped hole, with the elastomer 3 having multiple inlets 32, all of which are connected to the injection ports 131; this is not a limitation.

[0099] To further facilitate the injection of liquid into the elastomer 3 and improve the injection efficiency and speed, in one embodiment, the elastomer 3 is also provided with an exhaust port 33 that communicates with the elastic cavity 31. The housing 1 is provided with an outlet port 132 corresponding to the exhaust port 33. The battery structure 100 also includes a blocking member 5, which passes through the outlet port 132 and seals the exhaust port 33.

[0100] In this embodiment, as Figures 8 to 10 As shown, by simultaneously providing vent holes 33 on the elastomer 3 and providing corresponding vent holes 132 on the housing 1, the gas inside the elastic cavity 31 can be easily discharged using the vent holes 33 and vent holes 132. This facilitates the injection of liquid into the elastic cavity 31 while preventing excessive injection pressure from damaging the elastomer 3. It is understood that the shape of the vent holes 33 and vent holes 132 can be the same or different. The size of the vent holes 33 and vent holes 132 can also be the same or different.

[0101] Understandably, in order to seal the exhaust port 33 and the vent port 132, a plug 5 is provided, which passes through the vent port 132 and seals the exhaust port 33. It should be noted that the vent port 132 can be a through hole structure opened on the housing 1, or it can be an injection-molded structure or metal part embedded in the housing 1. The injection-molded structure or metal part has a cavity or channel communicating with the exhaust port 33, etc., and is not limited here.

[0102] In this embodiment, the housing 1 has a through-hole structure, which can be formed into a structural component by extrusion of aluminum. This structural component has a vent 132, which is embedded within the through-hole structure of the housing 1 and partially extends into the vent 33. To seal the vent 132, a plug 5 is laser-welded to the vent 132, thus improving the sealing effect at the vent 132. To seal the vent 33, the structural component and the vent 33 are sealed and bonded together with an adhesive, thus improving the sealing effect at the vent 33. Optionally, the adhesive is one of polyurethane, epoxy resin, or UV-curable adhesive.

[0103] Of course, in another embodiment, the vent 132 is a through-hole structure formed on the housing 1, and one end of the plug 5 passes through the vent 132 and extends into the exhaust hole 33. In order to seal the exhaust hole 33, the plug 5 and the exhaust hole 33 are sealed and bonded with adhesive, which can improve the sealing effect at the exhaust hole 33. Optionally, the adhesive is one of polyurethane, epoxy resin, and UV-curable adhesive.

[0104] To improve the injection speed and efficiency into the elastomer 3, the elastomer 3 is provided with multiple vent holes 33, and the housing 1 is provided with multiple air outlet holes 132 corresponding to the multiple vent holes 33. Multiple plugging components 5 are included, and each plugging component 5 is configured in a one-to-one correspondence with an air outlet hole 132. Alternatively, the air outlet hole 132 can be configured as a strip-shaped hole, with the elastomer 3 providing multiple vent holes 33, all of which are connected to the corresponding air outlet holes 132; this is not a limitation.

[0105] In one embodiment, the housing 1 includes a bottom shell 12 and a cover plate 13. The bottom shell 12 is provided with a mounting groove 121. The pole core 2 and the elastomer 3 are disposed in the mounting groove 121. The cover plate 13 covers the opening of the mounting groove 121 to form a mounting cavity 11.

[0106] In this embodiment, as Figures 1 to 4 As shown, to facilitate the assembly of the battery structure 100, the housing 1 is configured as a two-part structure consisting of a bottom shell 12 and a cover plate 13. The bottom shell 12 is a cylindrical structure with an opening at one end and a closed end at the other, thus providing a mounting groove 121. The cover plate 13 is connected to the open end of the bottom shell 12 to seal the opening of the mounting groove 121, thereby forming a mounting cavity 11 with the bottom shell 12 and the cover plate 13 together.

[0107] Understandably, to improve the sealing effect of the mounting cavity 11, the cover plate 13 and the bottom shell 12 are connected by laser welding. Optionally, the bottom shell 12 and the cover plate 13 of the housing 1 can be formed by stamping aluminum. In this embodiment, in order to facilitate the connection and assembly of the positive electrode, negative electrode and other structures of the battery structure 100 with the electrode core 2, no elastomer 3 is provided inside the gap 21 formed between the cover plate 13 and the electrode core 2.

[0108] In this embodiment, to facilitate the filling of electrolyte into the electrode core 2, a port 133 for injecting electrolyte is provided on the cover plate 13. Both the injection port 131 and the vent 132 are located on the cover plate 13. An inlet 32 ​​and a vent 33 are provided at the end of the elastomer 3 adjacent to the cover plate 13.

[0109] It should be noted that the shape and outline of the shell 1 are the same as those of the pole core 2. Understandably, the shell 1 can be a square structure or a cylindrical structure, and there is no limitation here.

[0110] To further reduce the contact thermal resistance between the housing 1 and the electrode core 2, in one embodiment, the elastic body 3 includes a bottom 34 and a side portion 35 connected to the bottom 34. The side portion 35 and the bottom 34 enclose each other to form a receiving groove 36. The electrode core 2 is accommodated in the receiving groove 36. The bottom 34 is provided with a first elastic cavity, and the side portion 35 is provided with a second elastic cavity. The first elastic cavity and the second elastic cavity communicate with each other to form an elastic cavity 31.

[0111] In this embodiment, as Figures 2 to 10 As shown, by setting the elastomer 3 as a bottom 34 and a side 35, the bottom 34 of the elastomer 3 is located in the bottom gap 21 formed by the shell 1 and the pole core 2, and the side 35 is located in the side gap 21 formed by the shell 1 and the pole core 2. In this way, the bottom wall and side wall of the pole core 2 can achieve rapid heat transfer through the elastomer 3, thereby reducing the contact thermal resistance between the shell 1 and the pole core 2.

[0112] Understandably, the bottom gap 21 formed by the housing 1 and the pole core 2 is located at the end of the bottom shell 12 of the housing 1 away from the cover plate 13, that is, the gap 21 formed between the side of the pole core 2 facing away from the cover plate 13 and the bottom shell 12. The side gap 21 formed by the housing 1 and the pole core 2 is located between the periphery of the pole core 2 and the bottom shell 12.

[0113] In this embodiment, the bottom 34 and side 35 of the elastomer 3 are integrally formed. To facilitate the injection of liquid into the elastic cavity 31, a first elastic cavity is provided in the bottom 34, and a second elastic cavity is provided in the side 35. The first elastic cavity and the second elastic cavity are connected to form the elastic cavity 31. An inlet 32 / vent hole 33 is provided at the end of the side 35 away from the bottom 34.

[0114] In one embodiment, the electrode core 2 is square, and the bottom 34 of the elastomer 3 may optionally be square. Optionally, the elastomer 3 includes two sides 35, which are connected to opposite sides of the bottom 34, such as... Figure 2 , Figure 3 , Figure 5 and Figure 8 As shown.

[0115] In another embodiment, the electrode core 2 is square, and the bottom 34 of the elastomer 3 is optionally square. Optionally, four sides 35 are included, and the four sides 35 are respectively connected to the four sides of the bottom 34. It is understood that the four sides 35 are independent structures, and one end of each side 35 is connected to the bottom 34, and the second elastic cavity of each side 35 is connected to the first elastic cavity of the bottom 34.

[0116] In another embodiment, the electrode core 2 is square, and the bottom 34 of the elastic body 3 may optionally be square. Optionally, the side portions 35 include four, which are connected end to end to form a square cylindrical structure, with one end of each side portion 35 connected to the bottom 34. It can be understood that the four side portions 35 enclose a cylindrical structure, that is, the second elastic cavities of the four side portions 35 are sequentially connected and communicate with the first elastic cavity of the bottom 34.

[0117] Of course, in another embodiment, the electrode core 2 is cylindrical or elliptical cylindrical, and the bottom 34 of the elastic body 3 is optionally circular or elliptical, with the side portions 35 arranged around the periphery of the bottom 34, forming a circular or elliptical cylindrical shape. It is understood that the second elastic cavity within the side portion 35 is connected to the first elastic cavity of the bottom 34. Alternatively, multiple side portions 35 may be included, spaced apart along the periphery of the bottom 34, with the multiple side portions 35 not connected to each other, or the second elastic cavities of the multiple side portions 35 not connected to each other, but only connected through the first elastic cavity of the bottom 34; this is not limited here.

[0118] Understandably, the elastomer 3 is installed and fitted into the gap between the side of the pole core 2 and the housing 1 and the ground, eliminating the need for the insulating gasket in the gap of the transmission bottom surface. After the elastomer 3 is installed, there is still a partial assembly gap between the pole core 2 and the housing 1. Insulating oil or fluorinated liquid is then injected through the injection port 131 and inlet 32, causing the elastomer 3 to expand and fit into the housing 1 and the pole core 2. It should be noted that the amount of liquid injected into the elastic cavity 31 of the elastomer 3 is controlled by both the injection pressure and the theoretical amount of void space, and is not limited here.

[0119] The present invention also proposes an assembly method for the above-mentioned battery structure 100. The specific structure of the battery structure 100 is as described in the foregoing embodiments. Since this assembly method adopts all the technical solutions of all the foregoing embodiments, it has at least all the beneficial effects brought about by the technical solutions of the foregoing embodiments, which will not be described in detail here.

[0120] In one embodiment, the assembly method includes:

[0121] A housing 1 is provided, which includes a bottom shell 12 and a cover plate 13. The bottom shell 12 has a mounting groove 121, and the cover plate 13 is provided with an injection port 131 and a through port 133.

[0122] An elastomer 3 is prepared, the elastomer 3 having an elastic cavity 31 and an inlet 32 ​​communicating with the elastic cavity 31;

[0123] Prepare the electrode core 2 by attaching the elastomer 3 to the outer wall of the electrode core 2;

[0124] The electrode core 2 and the elastomer 3 are installed into the mounting groove 121, with the electrode core 2 spaced apart from the groove wall of the mounting groove 121 to form a gap 21, and the elastomer 3 is located in the gap 21.

[0125] The cover plate 13 is welded and sealed to the bottom shell 12 to cover the opening of the mounting groove 121, so that the injection port 131 and the inlet 32 ​​are connected accordingly.

[0126] Electrolyte is injected into electrode core 2 through port 133 and port 133 is sealed.

[0127] Liquid is injected into the elastic cavity 31 through the injection port 131 and the inlet 32, causing the elastomer 3 to expand to fill the gap 21 and abut against the pole core 2 and the bottom shell 12, sealing the inlet 32 ​​and the injection port 131.

[0128] In this embodiment, the housing 1 can be a metal housing or a non-metal housing. It is understood that the housing 1 can be made of metal, such as aluminum. Of course, the housing 1 can also be injection molded from plastic; this is not a limitation.

[0129] To facilitate the assembly of the battery structure 100, the housing 1 includes two parts: a bottom shell 12 and a cover plate 13. Understandably, the bottom shell 12 of the housing 1 has a cylindrical structure with an opening at one end and a closed end, thus providing a mounting groove 121. The cover plate 13 is connected to the open end of the bottom shell 12 to seal the opening of the mounting groove 121, so that the bottom shell 12 and the cover plate 13 together form a mounting cavity 11.

[0130] Understandably, to improve the sealing effect of the mounting cavity 11, when welding the cover plate 13 to the bottom shell 12 to seal and cover the opening of the mounting groove 121, the cover plate 13 and the bottom shell 12 are connected by laser welding. Optionally, the bottom shell 12 and the cover plate 13 of the housing 1 can be formed by stamping aluminum. In this embodiment, in order to facilitate the connection and assembly of the positive electrode, negative electrode and other structures of the battery structure 100 with the electrode core 2, no elastic body 3 is provided inside the gap 21 formed between the cover plate 13 and the electrode core 2.

[0131] In this embodiment, the liquid injection port 131 of the cover plate 13 is used to inject liquid into the elastic cavity 31 of the elastomer 3, and the through port 133 of the cover plate 13 is used to inject electrolyte into the electrode core 2. It is understood that the shape and outline of the housing 1 are the same as the shape and outline of the electrode core 2. It is understood that the housing 1 can be a square structure or a cylindrical structure, and this is not limited thereto.

[0132] Understandably, the elastomer 3 can be encapsulated using a compression process to form the elastic cavity 31. The elastomer 3 is made of a thin strip material with openings at both ends, and a thin strip structure with the elastic cavity 31 is formed by hot pressing or adhesive bonding. In this embodiment, the liquid inside the elastic cavity 31 is an electrolyte or an insulating liquid. Optionally, the insulating liquid can be an insulating oil or a fluorinated liquid, etc., and is not limited here.

[0133] In this embodiment, to ensure that the liquid in the elastic cavity 31 does not leak out, the elastic cavity 31 of the elastomer 3, which is made of PI, PA, PET or aluminum-plastic film, is a cavity structure with sealing performance. It can be understood that in order for the elastomer 3 to be easily filled in the gap 21, the thickness of the elastomer 3 is less than the spacing of the gap 21 (that is, the distance from the outer wall of the electrode core 2 to the inner wall of the shell 1).

[0134] Optionally, the wall thickness of the elastomer 3 is 0.05 mm to 0.2 mm. It is understood that the wall thickness of the elastomer 3 is the wall thickness of one side of the elastomer 3, that is, the thickness between the outer wall of the elastomer 3 and the inner wall of the elastic cavity 31. Optionally, the wall thickness of the elastomer 3 can be 0.05 mm, 0.08 mm, 0.1 mm, 0.13 mm, 0.15 mm, 0.18 mm, 0.2 mm, etc., and is not limited here. In this embodiment, the spacing of the gap 21 can be selected as 0.5 mm to 1.5 mm.

[0135] In this embodiment, the elastomer 3 includes a bottom 34 and a side portion 35 connected to the bottom 34. The side portion 35 and the bottom 34 enclose each other to form a receiving groove 36. The pole core 2 is accommodated in the receiving groove 36. The bottom 34 is provided with a first elastic cavity, and the side portion 35 is provided with a second elastic cavity. The first elastic cavity and the second elastic cavity are connected to form an elastic cavity 31.

[0136] Understandably, the bottom 34 and side 35 of the elastomer 3 are integrally formed. To facilitate the injection of liquid into the elastic cavity 31, a first elastic cavity is provided in the bottom 34, and a second elastic cavity is provided in the side 35. The first elastic cavity and the second elastic cavity are connected to form the elastic cavity 31. An inlet 32 / vent 33 is provided at the end of the side 35 away from the bottom 34.

[0137] In this embodiment, the electrode core 2 is obtained after a series of production processes including positive and negative electrode material preparation, coating, rolling, slitting, winding / stacking, core pressing, and applying insulating tape. To avoid displacement or improper assembly of the elastomer 3 during assembly, which would also affect the expansion effect of the elastomer 3, in one embodiment, the side of the elastomer 3 facing the electrode core 2 is bonded to the outer wall of the electrode core 2 by an adhesive layer 6. That is, the elastomer 3 is first assembled to the outer wall of the electrode core 2, and then the electrode core 2 and the elastomer 3 are integrally installed into the mounting groove 121 of the bottom shell 12.

[0138] Understandably, the elastomer 3 has soft and shrinkable properties. The bottom 34 and side 35 of the elastomer 3 are bonded to the bottom wall and side wall of the electrode core 2 respectively through the adhesive layer 6, ensuring that the elastomer 3 is in close contact with the electrode core 2 or the bottom shell 12, without slippage or air bubbles.

[0139] Of course, in other embodiments, the elastomer 3 can be first installed in the mounting groove 121 of the bottom shell 12, so that the side of the elastomer 3 facing the shell 1 is bonded to the cavity wall of the mounting cavity 11 by the adhesive layer 6. That is, the elastomer 3 is first bonded to the inner wall of the mounting groove 121 by the adhesive layer 6, and then the electrode core 2 is installed in the mounting cavity 11 of the shell 1.

[0140] To facilitate the assembly of the elastomer 3 and the electrode core 2, in one embodiment, before the step of inserting the electrode core 2 and the elastomer 3 into the mounting groove 121, the following steps are also included:

[0141] Negative pressure is applied to the elastomer 3 through inlet 32 ​​to purge the air from the elastic cavity 31;

[0142] Among them, negative pressure is above 0.5 atmospheres.

[0143] Understandably, by applying negative pressure, the thickness of the elastomer 3 is reduced, allowing it to fit tightly against the outer wall of the electrode core 2 or the inner wall of the mounting groove 121. This not only facilitates assembly but also allows for the injection of liquid into the elastomer 3. Optionally, the negative pressure during the negative pressure application operation is above 0.5 atmospheres.

[0144] To ensure that the prepared electrode core 2 can be sealed, in one embodiment, before the step of welding and sealing the cover plate 13 to the bottom shell 12, the following steps are also included:

[0145] Test the core 2;

[0146] Welding pole core 2 and connecting piece.

[0147] Understandably, before installing the electrode core 2 into the mounting slot 121 of the bottom shell 12 and sealing the cover plate 13, it is necessary to test the performance of the electrode core 2, such as testing the internal resistance of the electrode core 2. After the internal resistance test of the electrode core 2 meets the standard, the electrode core 2, the connecting piece, and the cover plate 13 are laser welded.

[0148] In this embodiment, when the cover plate 13 is welded and sealed to the bottom shell 12, the liquid injection port 131 of the cover plate 13 is connected to the inlet 32 ​​of the elastomer 3 and sealed by laser welding, and then the cover plate 13 and the bottom shell 12 are welded and sealed.

[0149] In one embodiment, the steps of injecting electrolyte into the electrode core 2 through the port 133 and sealing the port 133 include:

[0150] Electrolyte is injected into electrode core 2 through port 133;

[0151] The battery structure 100 was subjected to high-temperature aging.

[0152] Electrolyte is injected a second time into electrode core 2 through port 133;

[0153] The 133-hole seal is achieved by laser welding of aluminum sheet.

[0154] Understandably, after the cover plate 13 and the bottom shell 12 are welded and sealed, the electrolyte needs to be injected into the electrode core 2 first, that is, the electrolyte is injected into the electrode core 2 through the electrolyte inlet 133 of the cover plate 13 itself, and then the battery structure 100 is subjected to high-temperature aging. After the high-temperature aging of the structure 100 is completed, the electrolyte is injected into the electrode core 2 a second time, and then the inlet 133 is blocked by means of aluminum sheet laser sealing or other methods.

[0155] In one embodiment, the step of injecting liquid into the elastic cavity 31 through the injection port 131 and the inlet 32, causing the elastomer 3 to expand to fill the gap 21 and abut against the electrode core 2 and the bottom shell 12 includes:

[0156] Negative pressure is applied to the elastomer 3 through the injection port 131 and the inlet 32 ​​to purge the air from the elastic cavity 31;

[0157] Liquid is injected into the elastic cavity 31 through the injection port 131 and the inlet 32;

[0158] The amount of liquid injected into the elastic cavity 31 is controlled according to the injection balance pressure or the volume of gap 21.

[0159] Stop injecting fluid when the preset target value is reached;

[0160] The sealing element 4 is inserted into the injection port 131 and the sealing inlet 32 ​​is sealed by laser welding or adhesive to seal the inlet 32 ​​and the injection port 131.

[0161] The injection equilibrium pressure is 3% to 10% higher than atmospheric pressure.

[0162] Understandably, before the elastic cavity 31 is inserted into the bottom shell 12, a negative pressure operation is performed on the elastic cavity 31 to remove the air inside the elastic cavity 31. This not only reduces the volume before insertion but also facilitates the injection of liquid into the elastic cavity 31.

[0163] In this embodiment, liquid can be directly injected into the elastic cavity 31 through the injection port 131 and the inlet 32. Alternatively, before injection, negative pressure can be applied to the elastomer 3 through the injection port 131 and the inlet 32 ​​to purge the air from the elastic cavity 31; then, liquid can be injected into the elastic cavity 31 through the injection port 131 and the inlet 32. Or, liquid can be directly injected into the elastic cavity 31 through the injection port 131 and the inlet 32, and the air in the elastic cavity 31 can be expelled through the vent hole 33 of the elastomer 3 and the vent hole 132 on the cover plate 13; this is not limited to any particular method.

[0164] Understandably, the amount of liquid injected into the elastic cavity 31 of the elastomer 3 can be controlled by calculating the volume of the gap 21. For example, the theoretical capacity of the elastic cavity 31 is calculated using the density of the injected liquid and the volume of the gap 21. Alternatively, the amount of liquid injected into the elastic cavity 31 of the elastomer 3 can also be controlled by the injection equilibrium pressure. Optionally, the injection equilibrium pressure is 3% to 10% greater than atmospheric pressure. In this embodiment, the injection is stopped when the amount of liquid injected into the elastic cavity 31 of the elastomer 3 reaches a preset target value. Then, the sealing member 4 is inserted into the injection port 131 and seals the sealing inlet 32 ​​using laser welding or adhesive to seal the inlet 32 ​​and the injection port 131. Alternatively, the sealing member 5 is simultaneously inserted into the vent 132 and seals the sealing vent 33 using laser welding or adhesive to seal the vent 33 and the vent 132; this is not limited here.

[0165] The elastomer 3 of the present invention uses an elastic thin film material to form an elastic cavity 31. After the battery structure 100 is assembled, an insulating liquid is added to the elastic cavity 31 of the elastomer 3 to fill the contact gap between the electrode core 2 and the housing 1 during the assembly of the battery structure 100, thereby significantly reducing the contact thermal resistance between the electrode core 2 and the housing 1. In the battery structure 100 of the present invention, the bottom area thermal resistance is 0.00125 μm. 2 K / W (0.0093m of standard battery cell) 2 The side area thermal resistance of the battery structure 100 is 0.005m (k / W). 2 K / W (approximately 0.037m³ for a standard battery cell) 2 (K / W) reduces the interface thermal resistance by approximately 85% compared to room-temperature prismatic batteries. This reduces the thermal conductivity barrier of the core 2, making it suitable for high-rate applications such as 4C fast charging.

[0166] Understandably, in the battery structure 100 of the present invention, the elastomer 3 can be deformed to directly cool the electrode core 2 from three sides, greatly reducing the thermal resistance of the battery structure 100 to the coolant and making the temperature more uniform. It should be noted that for the square battery structure 100, the electrode core 2 has a large surface area. During use, the electrode core 2 will expand on this large surface area and come into contact with the casing 1 (i.e., the inner wall of the bottom casing 12). To avoid damage to the elastomer 3 due to the expansion of the electrode core 2, the elastomer 3 may not be provided within the gap 21 between the large surface of the electrode core 2 and the casing 1. Optionally, the cover plate 13 is provided corresponding to the small side surface of the electrode core 2.

[0167] Of course, since the elastic cavity 31 of the elastomer 3 is an integral structure, that is, the first elastic cavity at the bottom 34 and the second elastic cavity at the side 35 are connected, the amount of liquid injected into the elastic cavity 31 can be controlled so that when the electrode core 2 expands and comes into contact with the shell 1, the liquid in the elastic cavity 31 is squeezed to flow, thereby providing expansion space for the expansion of the electrode core 2 on the large surface. This is not limited here.

[0168] The present invention also proposes an electric device, which includes a device body and the aforementioned battery structure 100. The battery structure 100 is disposed on the device body and electrically connected to the device body. The specific structure of the battery structure 100 is as described in the foregoing embodiments. Since this electric device adopts all the technical solutions of all the foregoing embodiments, it has at least all the beneficial effects brought about by the technical solutions of the foregoing embodiments, which will not be elaborated here.

[0169] Understandably, electric devices can be electric vehicles, electronic devices, or other intelligent devices using battery structure 100, etc., and are not limited here.

[0170] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made under the concept of the present invention using the description and drawings of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A battery structure, characterized in that, The battery structure includes: A housing, wherein the housing is provided with a mounting cavity; An electrode core, wherein the electrode core is disposed within the mounting cavity and spaced from the cavity wall to form a gap; and An elastomer is disposed within the gap, and the elastomer has an elastic cavity for filling with liquid, so that the elastomer fills the gap and abuts against the cavity wall of the electrode core and the mounting cavity; The elastomer is further provided with an inlet communicating with the elastic cavity, and the housing is provided with a liquid injection port corresponding to the inlet; the battery structure also includes a sealing member, which is inserted into the liquid injection port and seals the inlet.

2. The battery structure according to claim 1, characterized in that, The elastomer is made of at least one of PI, PA, PET or aluminum-plastic film; And / or, the elastomer is encapsulated using a thermoforming process to form the elastic cavity; And / or, the wall thickness of the elastomer is 0.05mm~0.2mm; And / or, the liquid is an electrolyte or an insulating liquid.

3. The battery structure according to claim 1, characterized in that, The side of the elastomer facing the electrode core is bonded to the outer wall of the electrode core by an adhesive layer; Alternatively, the side of the elastomer facing the housing is bonded to the cavity wall of the mounting cavity via an adhesive layer.

4. The battery structure according to claim 3, characterized in that, The adhesive layer is one of non-woven fabric substrate double-sided adhesive, substrate-free double-sided adhesive, and PET substrate double-sided adhesive. And / or, the thickness of the adhesive layer is less than or equal to 0.1 mm.

5. The battery structure according to claim 1, characterized in that, The elastomer is further provided with an exhaust port communicating with the elastic cavity, the housing is provided with an outlet port corresponding to the exhaust port, and the battery structure further includes a blocking member, which passes through the outlet port and seals the exhaust port.

6. The battery structure according to claim 5, characterized in that, The sealing component is laser-welded to the injection port; And / or, the sealing element is sealed and bonded to the inlet by an adhesive, wherein the adhesive is one of polyurethane, epoxy resin, and UV-curable adhesive; And / or, the plug is laser-welded to the vent hole; And / or, the plugging component is sealed and bonded to the vent hole by an adhesive, the adhesive being one of polyurethane, epoxy resin, or UV-curable adhesive.

7. The battery structure according to any one of claims 1 to 6, characterized in that, The elastomer includes a bottom and a side portion connected to the bottom. The side portion and the bottom enclose a groove to form a receiving groove. The electrode core is accommodated in the receiving groove. The bottom is provided with a first elastic cavity, and the side portion is provided with a second elastic cavity. The first elastic cavity and the second elastic cavity communicate with each other to form the elastic cavity.

8. The battery structure according to claim 7, characterized in that, The pole core is square, and the bottom is square; the side portion includes two, and the two side portions are connected to opposite sides of the bottom; or, the side portion includes four, and the four side portions are respectively connected to the four sides of the bottom; or, the side portion includes four, and the four side portions are connected end to end to form a square cylindrical structure, and one end of the four side portions is connected to the bottom. Alternatively, the pole core may be cylindrical or elliptical, the bottom may be circular or elliptical, and the side may be arranged around the periphery of the bottom to form a circular or elliptical cylindrical shape.

9. The battery structure according to any one of claims 1 to 6, characterized in that, The housing includes: The bottom shell has a mounting groove, and the pole core and the elastic body are disposed within the mounting groove; and A cover plate that covers the opening of the mounting groove to enclose and form the mounting cavity.

10. A method for assembling a battery structure as described in any one of claims 1 to 9, characterized in that, The assembly method includes: A housing is provided, the housing comprising a bottom shell and a cover plate, the bottom shell having a mounting groove, and the cover plate having an injection port and a through port; An elastomer is prepared having an elastic cavity and an inlet communicating with the elastic cavity; Prepare an electrode core by attaching the elastomer to the outer wall of the electrode core; The electrode core and the elastomer are installed into the mounting groove, with the electrode core spaced apart from the groove wall to form a gap, and the elastomer located within the gap; The cover plate is welded and sealed to the bottom shell to cover the opening of the mounting groove, so that the injection port and the inlet are connected accordingly; Electrolyte is injected into the electrode core through the inlet, and the inlet is then sealed. Liquid is injected into the elastic cavity through the injection port and the inlet, causing the elastomer to expand to fill the gap and abut against the electrode core and the bottom shell, sealing the inlet and the injection port.

11. The assembly method according to claim 10, characterized in that, Before the step of welding and sealing the cover plate to the bottom shell, the method further includes: The electrode core was tested; The electrode core and connecting piece are welded together.

12. The assembly method according to claim 10, characterized in that, Before the step of inserting the pole core and the elastomer into the mounting groove, the method further includes: Negative pressure is applied to the elastomer through the inlet to purge the air from the elastic cavity; The negative pressure is above 0.5 atmospheres.

13. The assembly method according to claim 10, characterized in that, The step of injecting electrolyte into the electrode core through the port and sealing the port includes: Electrolyte is injected into the electrode core through the port; The battery structure was subjected to high-temperature aging. Electrolyte is injected a second time into the electrode core through the port; The opening is sealed by laser welding of aluminum sheet.

14. The assembly method according to claim 10, characterized in that, The step of injecting liquid into the elastic cavity through the injection port and the inlet, causing the elastomer to expand to fill the gap and abut against the electrode core and the bottom shell includes: Negative pressure is applied to the elastomer through the injection port and the inlet to purge the air from the elastic cavity; Liquid is injected into the elastic cavity through the injection port and the inlet; The amount of liquid injected into the elastic cavity is controlled according to the injection balance pressure or the gap volume. Stop injecting fluid when the preset target value is reached; The sealing element is inserted into the injection port and seals the inlet by laser welding or adhesive to seal the inlet and the injection port. The injection equilibrium pressure is greater than 3% to 10% of atmospheric pressure.

15. An electric device, characterized in that, It includes a device body and a battery structure as described in any one of claims 1 to 9, wherein the battery structure is disposed on the device body and electrically connected to the device body.

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