Battery and electric device

Abstract

The invention provides a battery and a power utilization device, and relates to the technical field of power batteries. The battery comprises a shell, a battery cell and a bottom supporting plate, the bottom supporting plate and the battery cell are arranged in the shell, the bottom supporting plate is made of a hot melt adhesive material, the battery cell is borne on the bottom supporting plate, the battery cell is bonded and fixed to the shell through the bottom supporting plate in the hot melt solidification process, and the battery can weaken battery cell movement caused by mechanical vibration.

Description

Technical Field

[0001] This application relates to the technical field of power batteries, and more particularly, to a battery and an electrical device using the same. Background Art

[0002] With the accelerating development of new energy technologies, new energy vehicles have gradually replaced traditional fuel vehicles and become one of the mainstream means of transportation. As a core component of new energy vehicles, power batteries provide the power source, and their safety performance has received increasing attention.

[0003] In a square aluminum shell battery, the battery cell is usually connected to the external aluminum shell only by the soft connection between the tab and the terminal post. However, due to the influence of mechanical vibration during the production or service process of the battery, the mechanical vibration may cause the battery cell to move, and in severe cases, it may lead to battery performance failure or even safety problems. Summary of the Invention

[0004] The objectives of this application include, for example, providing a battery and an electrical device using the same, which can reduce the problem of battery cell movement caused by mechanical vibration.

[0005] Embodiments of this application can be implemented as follows:

[0006] An embodiment of this application provides a battery, which includes a housing, a battery cell, and a bottom support plate. The bottom support plate and the battery cell are both disposed inside the housing. The bottom support plate is made of a hot melt adhesive material. The battery cell is carried on the bottom support plate, and the battery cell is adhesively fixed to the housing through the bottom support plate during the hot melt solidification process.

[0007] Optionally, the melting point of the hot melt adhesive material is 50°C - 150°C.

[0008] Optionally, the hot melt adhesive material is a polymer hot melt adhesive, including one or more of ethylene and its copolymer hot melt adhesives, polyurethane hot melt adhesives, polyamide hot melt adhesives, polyester hot melt adhesives, and polyolefin hot melt adhesives.

[0009] Optionally, a first step surface, a second step surface, and a third step surface with a height difference are provided on the side of the bottom support plate facing the battery cell. Along the height direction of the battery, the heights of the first step surface, the second step surface, and the third step surface decrease in sequence, and the battery cell is partially carried on the second step surface.

[0010] Optionally, a plurality of support ribs are arranged at intervals in a first direction on the third step surface. The battery cell is partially carried on the plurality of support ribs. The support ribs extend in a second direction. Herein, the bottom support plate is a rectangular body, the first direction is the width direction of the bottom support plate, and the second direction is the length direction of the bottom support plate.

[0011] Optionally, the battery cell includes a stacked electrode sheet and a separator, and a part of the separator extends into a gap between two adjacent support edges.

[0012] Optionally, two first blocking surfaces are oppositely arranged on the bottom support plate along the first direction, and two second blocking surfaces are oppositely arranged on the bottom support plate along the second direction. The first blocking surface is connected between the first step surface and the third step surface, and the second blocking surface is connected between the second step surface and the third step surface. An accommodating groove for storing electrolyte is defined between the two first blocking surfaces and the two second blocking surfaces, and a plurality of the support edges are located in the accommodating groove.

[0013] Optionally, the ratio of the distance between the first step surface and the second step surface to the height of the bottom support plate is 0.4 - 0.5; the ratio of the distance between the first step surface and the third step surface to the height of the bottom support plate is 0.5 - 0.8.

[0014] Optionally, two limiting surfaces are oppositely arranged on the bottom support plate along the second direction. The limiting surfaces are connected between the first step surface and the second step surface. Along the second direction, two opposite side surfaces of the battery cell are respectively in contact with the two limiting surfaces.

[0015] The present application also provides an electrical device including the above-mentioned battery.

[0016] The beneficial effects of the battery and the electrical device provided by the embodiments of the present application include, for example: in order to weaken the movement of the battery cell caused by mechanical vibration, a battery is designed. The battery includes a housing, a battery cell, and a bottom support plate. The bottom support plate and the battery cell are both arranged inside the housing. The bottom support plate is made of a hot melt adhesive material. The battery cell is carried on the bottom support plate, and the battery cell is adhesively fixed to the housing through the bottom support plate during the hot melt solidification process. Since the bottom support plate is made of a hot melt adhesive material and the battery cell is adhesively fixed to the housing through the bottom support plate during the hot melt solidification process, when the battery is affected by mechanical vibration during the production process or service process, mechanical vibration is not likely to cause the battery cell to move, thereby avoiding the battery performance failure or even safety problems to a certain extent. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1Schematic diagram of the battery in the embodiments of the present application;

[0019] Figure 2 Schematic diagram of the first perspective structure of the bottom support plate in the embodiments of the present application;

[0020] Figure 3 Schematic diagram of the second perspective structure of the bottom support plate in the embodiments of the present application;

[0021] Figure 4 Partial cross-sectional view of the bottom support plate in the embodiments of the present application.

[0022] Icons: 10 - battery; 100 - outer shell; 200 - battery cell; 300 - bottom support plate; 310 - first step surface; 320 - second step surface; 330 - third step surface; 331 - support rib; 340 - first blocking surface; 350 - second blocking surface; 360 - receiving groove; 370 - limiting surface; 380 - positioning hole. Detailed implementation manners

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Usually, the components of the embodiments of the present application described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application claimed, but merely represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts fall within the scope of protection of the present application.

[0025] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0026] In the description of the present application, it should be noted that if terms such as "upper", "lower", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the inventive product is usually placed during use, it is only for the convenience of describing the present application 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 thus should not be construed as a limitation to the present application.

[0027] In addition, if terms such as "first", "second", etc. are only used for distinguishing descriptions, they cannot be understood as indicating or implying relative importance.

[0028] It should be noted that, without conflict, the features in the embodiments of the present application can be combined with each other.

[0029] As disclosed in the background art section, in a square aluminum shell battery, usually the battery cell is only connected to the external aluminum shell by the soft connection between the tab and the terminal post. However, due to the battery being vulnerable to mechanical vibration during the production process or service life, the mechanical vibration may cause the battery cell to move around, and when the battery cell moves around severely, it may lead to battery performance failure or even safety problems. The embodiments of the present application provide a battery, which is at least used to solve the above technical problems.

[0030] Please refer to Figures 1 - 4 , the battery 10 provided by the embodiments of the present application includes a housing 100, a battery cell 200, and a bottom support plate 300. The bottom support plate 300 and the battery cell 200 are both arranged inside the housing 100. The bottom support plate 300 is made of a hot melt adhesive material. The battery cell 200 is carried on the bottom support plate 300, and moreover, the battery cell 200 is adhesively fixed to the housing 100 through the bottom support plate 300 during the process of hot melt solidification. Since the bottom support plate 300 is made of a hot melt adhesive material and the battery cell 200 is adhesively fixed to the housing 100 through the bottom support plate 300 during the process of hot melt solidification, when the battery 10 is affected by mechanical vibration during the production process or service life, the mechanical vibration is not likely to cause the battery cell to move around, thereby avoiding triggering battery performance failure or even safety problems to a certain extent.

[0031] The battery 10 consists of three main parts: a housing 100, a battery cell 200, and a bottom support plate 300. Among them, the bottom support plate 300 and the battery cell 200 are both placed in the internal space of the housing 100, and the outer surface of the battery cell 200 is coated with an insulating film. In particular, the bottom support plate 300 is made of a hot melt adhesive material, which has good adhesion performance and can quickly soften and undergo physical or chemical changes to solidify after being heated. When the battery cell 200 is placed on the bottom support plate 300, as the bottom support plate 300 gradually undergoes hot melt solidification under heating conditions, the surface of the bottom support plate 300 will firmly bond with the battery cell 200 and the inner wall of the housing 100, thereby realizing the fixed connection between the battery cell 200 and the housing 100.

[0032] When the bottom support plate 300 made of a hot melt adhesive material bonds the battery cell 200 and the housing 100, the peel strength after bonding is between 12 N / 25 mm and 120 N / 25 mm, making it difficult for the bottom support plate 300 to separate from the battery cell 200 and the housing 100.

[0033] In some embodiments, the melting point of the hot melt adhesive material is 50°C - 150°C.

[0034] It should be noted that when the hot melt adhesive material used for the bottom tray 300 reaches its melting point, at least the parts of the bottom tray 300 in contact with the battery cell 200 and the housing 100 become liquid. At this time, the melted part of the bottom tray 300 can be in full contact with the battery cell 200 and the housing 100. When the melted part of the bottom tray 300 solidifies, the bottom tray 300 can be adhesively fixed to both the battery cell 200 and the housing 100 simultaneously.

[0035] Exemplarily, the melting point of the hot melt adhesive material is 50°C, 70°C, 90°C, 110°C, 130°C or 150°C.

[0036] In an alternative embodiment, the melting point of the hot melt adhesive material is 80°C - 120°C. Exemplarily, the melting point of the hot melt adhesive material is 80°C, 90°C, 100°C, 110°C or 120°C.

[0037] In another alternative embodiment, the melting point of the hot melt adhesive material is 95°C - 105°C. Exemplarily, the melting point of the hot melt adhesive material is 95°C, 100°C or 105°C.

[0038] In some embodiments, the hot melt adhesive material is a polymer hot melt adhesive, including: one or more of ethylene and its copolymer hot melt adhesives, polyurethane hot melt adhesives, polyamide hot melt adhesives, polyester hot melt adhesives, and polyolefin hot melt adhesives.

[0039] It should be noted that ethylene and its copolymer hot melt adhesives have good flexibility, impact resistance, and low-temperature resistance. Such hot melt adhesives are usually prepared by copolymerizing ethylene monomers with other olefins, and their molecular chain structures contain a large number of flexible side groups, which enables them to maintain good bonding effects even in low-temperature environments.

[0040] Polyurethane hot melt adhesive is made by dissolving the prepolymer formed by the reaction of polyol and isocyanate in a solvent or in a molten state. It can form a strong adhesion force with various substrates (such as plastics, metals, wood, etc.). More importantly, polyurethane hot melt adhesive can work within a relatively wide temperature range and is sensitive to moisture, which endows it with unique moisture curing ability, making it particularly suitable for some applications that require quick positioning but also need a certain time to reach the final strength.

[0041] Polyamide hot melt adhesives exhibit excellent mechanical properties and chemical stability due to the presence of a large number of amide groups. Polyamide hot melt adhesives not only have a relatively high softening point, ensuring their heat resistance during use, but also have very good tensile strength and wear resistance, making them very suitable for manufacturing product components that need to withstand large stresses.

[0042] Polyester hot melt adhesives are generally prepared by the polycondensation method of dibasic acids and diols. Their molecular structure contains ester bonds, which endow the product with certain elasticity and toughness. Since polyester hot melt adhesives have good resistance to most chemicals, they are often used to bond items that will come into contact with oils, solvents or other chemical substances.

[0043] Polyolefin hot melt adhesives are a type of thermoplastic elastomer mainly composed of polypropylene or polyethylene. The characteristics of this type of hot melt adhesive lie in its extremely low cost and good environmental protection properties. Polyolefin hot melt adhesives are usually produced by the melt extrusion process, which is easy to operate and does not release harmful substances during the bonding process.

[0044] The bottom support plate 300 can be placed at the bottom of the outer shell 100. A height step is provided on the surface of the bottom support plate 300, and the support ribs at the bottom of the step can abut against the bottom of the battery cell 200. The battery cell in this application is a bare battery cell. In the existing technology, for a bare battery cell, the electrode plates and the separator are stacked, and R corners are formed at both ends after winding and hot pressing. The R corners at both ends of the bare battery cell can be placed in the grooves formed by the height steps on the surface of the bottom support plate 300, which can effectively limit and wrap the bare battery cell. Further, the separator of the part of the bare battery cell that exceeds the electrode plate at the bottom can be received in the groove between the support ribs.

[0045] In some embodiments, on one side of the bottom support plate 300 facing the battery cell 200, there are a first step surface 310, a second step surface 320 and a third step surface 330 with a height difference. Along the height direction of the battery 10, the heights of the first step surface 310, the second step surface 320 and the third step surface 330 decrease in sequence, and a part of the battery cell 200 is carried on the second step surface 320.

[0046] On the third step surface 330, a plurality of support ribs 331 are arranged at intervals along the first direction x. A part of the battery cell 200 is carried on the plurality of support ribs 331. The support ribs 331 extend along the second direction y. Among them, the bottom support plate 300 is a rectangular body, the first direction x is the width direction of the bottom support plate 300, and the second direction y is the length direction of the bottom support plate 300.

[0047] It should be noted that the first step surface 310 is arranged in a circle around the bottom support plate 300. There are two second step surfaces 320 arranged oppositely along the second direction y. The third step surface 330 is located between the two second step surfaces 320. In the second direction y, a part of one side of the battery cell 200 is carried on one of the second step surfaces 320, and a part of the other side of the battery cell 200 is carried on the other second step surface 320. The whole battery cell 200 can be carried on the support ribs 331 and the second step surface 320, thereby improving the overall stability and reliability.

[0048] The gaps between adjacent support ribs 331 are of equal size. The middle part of the battery cell 200 is carried by a plurality of support ribs 331. The support ribs 331 are strip-shaped and extend along the second direction y, where the second direction y is the length direction of the battery cell 200. The extending direction of the support ribs 331 is the length direction of the battery cell 200, and the support ribs 331 are arranged in the middle of the battery cell 200 in the length direction, so as to improve the contact area between the support ribs 331 and the battery cell 200 as much as possible, evenly distribute the stress, reduce the deformation of the battery cell 200, and further improve the stability.

[0049] In some embodiments, the battery cell 200 includes a stacked electrode sheet and separator. The separator partially extends into the gap between two adjacent support ribs 331. The electrode sheet and separator of the battery cell 200 can be formed by winding or laminating. When formed by winding, the electrode sheet and separator include a flat area and a bent area. The extending direction of the flat area is parallel to the second direction y, and the gap between the support ribs 331 extends along the second direction y, so that it is convenient for the separator in the flat area to extend into the gap between two adjacent support ribs 331. When formed by laminating, the electrode sheet and separator extend along the second direction y, and the gap between the support ribs 331 extends along the second direction y, so that the middle part of the separator along the second direction y extends into the gap between two adjacent support ribs 331, and the edge of the separator can be carried on the second step surface 320. Whether formed by winding or laminating, the separator at least partially extends along the second direction y, and the gap between two adjacent support ribs 331 extends along the second direction y, so that the separator can partially extend into the gap between two adjacent support ribs 331.

[0050] For the battery cell 200 with stacked electrode sheet and separator, the bottom of the separator extends beyond the electrode sheet and into the gap between two adjacent support ribs 331, and can be fixed together with the bottom support plate 300 during the hot melt solidification process; since the number of separators is multiple, the gap between the support ribs 331 can be set to match the number of separators, so that the bottom of each separator extends into the corresponding gap between two adjacent support ribs 331.

[0051] It can be understood that if the part of the separator bottom that extends beyond the electrode sheet is directly pressed on the bottom support plate 300, it is easy to cause the separator to be folded and it is difficult to form an effective bond with the bottom support plate 300, and it is also easy for the electrode sheet to be hindered by the folded separator and it is difficult to contact the electrolyte.

[0052] Through the gaps provided between the supporting ridges 331, these gaps can provide space for the part of the separator beyond the electrode tab to stretch out, ensuring that the end of the electrode tab facing the bottom support plate 300 will not be blocked by the separator, that is, effectively bonding the battery cell 200 during the melting and solidification of the bottom support plate 300. In addition, the electrolyte is likely to deposit in the gaps formed between the supporting ridges 331, thereby achieving the storage of the electrolyte. And the separator extends into the gaps, which is beneficial for the direct contact between the electrolyte and the separator, improving the wetting effect of the electrolyte on the battery cell 200.

[0053] In some embodiments, the bottom support plate 300 is provided with two first blocking surfaces 340 oppositely along the first direction x, and the bottom support plate 300 is provided with two second blocking surfaces 350 oppositely along the second direction y. The first blocking surface 340 is connected between the first step surface 310 and the third step surface 330, and the second blocking surface 350 is connected between the second step surface 320 and the third step surface 330. An accommodation groove 360 for storing the electrolyte is defined between the two first blocking surfaces 340 and the two second blocking surfaces 350, and a plurality of supporting ridges 331 are located in the accommodation groove 360.

[0054] When the battery cell 200 is carried on the plurality of supporting ridges 331, the side surface of the battery cell 200 along the first direction x abuts against the first blocking surface 340 to achieve the limitation of the battery cell 200 in the first direction x.

[0055] An accommodation groove 360 is defined between the two first blocking surfaces 340 and the two second blocking surfaces 350. The accommodation groove 360 can store the electrolyte, so that the electrolyte fills the gaps between any two adjacent supporting ridges 331 to ensure the wetting effect of the electrolyte on the battery cell 200.

[0056] The length of the supporting ridge 331 is less than the length of the third step surface 330 in the second direction y. Optionally, the ratio of the length of the supporting ridge 331 to the length of the third step surface 330 in the second direction y is 0.85 - 1.0.

[0057] The height h4 of the supporting rib 331 is greater than the distance h3 between the second step surface 320 and the third step surface 330, so as to ensure that most of the battery cell 200 is supported on the supporting rib 331 and ensure the stability of the battery cell 200; and the height h4 of the supporting rib 331 is less than the distance h2 between the first step surface 310 and the third step surface 330, so as to ensure that part of the battery cell 200 is supported on the supporting rib 331 and part is supported on the second step surface 320, and is limited by the limiting surface 370 connected to the first step surface 310. It should be noted that the height h4 of the supporting rib 331 can be determined according to the distance that the edge of the negative electrode plate exceeds the positive electrode plate and the distance that the edge of the separator exceeds the negative electrode plate. The supporting rib 331 actually supports the electrode plates inside the battery cell 200, and the separator extends into the gap between the supporting ribs 331, so that the supporting rib 331 can partially extend into the bottom of the battery cell 200 for support, improving the stability of the electrode plates.

[0058] In some embodiments, the ratio of the distance h1 between the first step surface 310 and the second step surface 320 to the height of the bottom support plate 300 is 0.4 - 0.5, which can ensure the limiting effect on the battery cell 200; the ratio of the distance h2 between the first step surface 310 and the third step surface 330 to the height of the bottom support plate 300 is 0.5 - 0.8, so as to facilitate the accommodation of the electrolyte and improve the wetting effect of the electrolyte. Through the design of the heights of the first step surface 310, the second step surface 320, the third step surface 330 and the supporting rib 331, it can be ensured that the battery cell 200 is mainly borne on the supporting rib 331 and partially borne on the second step surface 320, thereby optimizing the stress at the bottom of the battery cell 200, avoiding deformation or damage of the battery cell caused by stress concentration, and at the same time forming an accommodation groove 360 for storing the electrolyte, so as to facilitate the wetting effect of the electrolyte. Further, the gap between the supporting ribs 331 allows the separator to extend into the gap, further improving the wetting effect of the electrolyte.

[0059] The thickness of the bottom support plate 300 is 0.5 mm - 5 mm. Exemplarily, the thickness of the bottom support plate 300 is 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm or 5 mm.

[0060] Taking the thickness of the bottom support plate 300 as 1 mm as an example, when the ratio of the distance h1 between the first step surface 310 and the second step surface 320 to the height of the bottom support plate 300 is 0.5, the distance h1 between the first step surface 310 and the second step surface 320 is 0.5 mm; when the ratio of the distance h2 between the first step surface 310 and the third step surface 330 to the height of the bottom support plate 300 is 0.5, the distance h2 between the first step surface 310 and the third step surface 330 is 0.5 mm.

[0061] Taking the thickness of the bottom support plate 300 as 3 mm as an example, when the ratio of the distance h1 between the first step surface 310 and the second step surface 320 to the height of the bottom support plate 300 is 0.5, the distance h1 between the first step surface 310 and the second step surface 320 is 1.5 mm; when the ratio of the distance h2 between the first step surface 310 and the third step surface 330 to the height of the bottom support plate 300 is 0.5, the distance h2 between the first step surface 310 and the third step surface 330 is 1.5 mm.

[0062] Taking the thickness of the bottom support plate 300 as 5 mm as an example, when the ratio of the distance h1 between the first step surface 310 and the second step surface 320 to the height of the bottom support plate 300 is 0.5, the distance h1 between the first step surface 310 and the second step surface 320 is 2.5 mm; when the ratio of the distance h2 between the first step surface 310 and the third step surface 330 to the height of the bottom support plate 300 is 0.5, the distance h2 between the first step surface 310 and the third step surface 330 is 2.5 mm.

[0063] In some embodiments, two limiting surfaces 370 are oppositely arranged on the bottom support plate 300 along the second direction y. The limiting surfaces 370 are connected between the first step surface 310 and the second step surface 320. Along the second direction y, the two opposite side surfaces of the battery cell 200 are respectively attached to the two limiting surfaces 370.

[0064] The shape of the limiting surface 370 matches the shape of the side surface of the battery cell 200 along the second direction y. When the two opposite side surfaces of the battery cell 200 are respectively attached to the two limiting surfaces 370, the two limiting surfaces 370 can limit the battery cell 200 in the second direction y.

[0065] In an alternative embodiment, after winding and hot pressing, the battery cell 200 forms R corners on both sides, that is, the side surface of the battery cell 200 along the second direction y forms an arc surface (i.e., the bending area). Correspondingly, the shape of the limiting surface 370 is also an arc surface. The limiting surface 370 and the side surface of the battery cell 200 along the second direction y are matched and limited, which can prevent the misalignment or wrinkling of the pole pieces and the separator of the battery cell 200 at the bending area or the R corner, avoid short circuit or self-discharge problems. At the same time, the limitation of the bending area or the R corner ensures that the pole pieces and the separator are closely attached, reduces the interlayer gap, and improves the infiltration effect of the electrode liquid.

[0066] The length of the third step surface 330 along the second direction y is less than the length of the part of the battery cell 200 excluding the R corner (i.e., the straight area). Optionally, the ratio of the length of the third step surface 330 along the second direction y to the length of the part of the battery cell 200 excluding the R corner is 0.9 - 1.0. With such a design, the part of the battery cell 200 excluding the R corner can be carried on the second step surface 320 and the third step surface 330 simultaneously, reducing the stress distribution difference between the R corner and the part excluding the R corner (i.e., the difference between the straight area and the bent area), and avoiding reducing the battery safety and affecting the battery life due to uneven stress distribution.

[0067] In some embodiments, the number of battery cells 200 is multiple. Each battery cell 200 is limited by two limiting surfaces 370 oppositely arranged along the second direction y. Multiple battery cells 200 are sequentially arranged in the housing 100 along the first direction x. One side of multiple battery cells 200 in the first direction x is attached to one of the first blocking surfaces 340, and the other side of multiple battery cells 200 in the first direction x is attached to the other first blocking surface 340, realizing the limitation of multiple battery cells 200 in the first direction x. Both sides of each battery cell 200 in the second direction y are attached to the corresponding two limiting surfaces 370, realizing the limitation of multiple battery cells 200 in the second direction y.

[0068] It can be understood that when the number of battery cells 200 is one, one side of the battery cell 200 in the first direction x is attached to one of the first blocking surfaces 340, and the other side of the battery cell 200 in the first direction x is attached to the other first blocking surface 340. At the same time, the battery cell 200 is limited by two limiting surfaces 370 oppositely arranged along the second direction y. By limiting both sides of the battery cell 200 in the first direction x, it can also ensure the tight fitting of the electrode tabs and the separator of the battery cell 200, reducing the deformation of the electrode tabs and the separator.

[0069] By performing double limitation on the battery cell 200 in the first direction x and the second direction y, the situation of the battery cell 200 moving around is alleviated, the stability of the battery cell 200 is further improved, the tight fitting of the electrode tabs and the separator is ensured, the deformation is reduced, and the battery safety is improved.

[0070] In addition, positioning holes 380 are provided on both sides of the bottom support plate 300 in the second direction y. The positioning holes 380 are mainly used to facilitate the transfer of the bottom support plate 300 by a robotic arm during the assembly of the battery 10.

[0071] The assembly process of the battery 10 provided by the embodiment of the present application is as follows: In the process of inserting the battery cell 200 into the casing, the bottom support plate 300 is placed into the outer casing 100 together with the battery cell 200. During the high-temperature baking process, the bottom support plate 300 made of a hot-melt adhesive material melts. Among them, the support ribs 331 melt and infiltrate the separator of the battery cell 200. After returning to room temperature, the bottom support plate 300 solidifies, bonding the battery cell 200 to the bottom of the outer casing 100. After the support ribs 331 melt and solidify, gaps are formed between adjacent support ribs 331, and the electrolyte can be stored in the receiving groove 360 and fill the gaps formed between the support ribs 331.

[0072] The technical effects of the battery 10 provided by the embodiment of the present application at least include: By setting the material of the bottom support plate 300 as a hot-melt adhesive material, without increasing the complexity of the process, it can effectively alleviate the problem of battery 10 failure caused by the displacement of the battery cell 200; By optimizing the structure of the bottom support plate 300, on the one hand, it can improve the bonding effect of the bottom support plate 300 on the battery cell 200 during the hot-melt solidification process, and on the other hand, it can strengthen the infiltration effect of the electrolyte on the bottom of the battery cell 200; No additional device is added inside the outer casing 100, which will not overly occupy the internal space of the battery 10 and cause problems such as a decrease in the energy density of the battery 10.

[0073] The embodiment of the present application also provides an electrical device including the above-mentioned battery 10. For example, the electrical device can be a vehicle, a ship, a spacecraft, etc. The vehicle can be a fuel vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc.; The spacecraft includes airplanes, rockets, space shuttles, and spaceships, etc. The embodiment of the present application does not impose special restrictions on the above-mentioned electrical device.

[0074] In summary, the embodiment of the present application provides a battery 10 and an electrical device. By using a hot-melt adhesive material to make the bottom support plate 300, the bottom support plate 300 can gradually melt and solidify under heating conditions, so that the bottom support plate 300 is bonded and fixed to both the battery cell 200 and the outer casing 100 at the same time. When the battery 10 is affected by mechanical vibration during the production process or service process, the mechanical vibration is not likely to cause the displacement of the battery cell 200, thereby avoiding the performance failure or even safety problems of the battery 10 to a certain extent.

[0075] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in the present application should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A battery, characterized in that, It includes a housing (100), a battery cell (200) and a bottom support plate (300). Both the bottom support plate (300) and the battery cell (200) are arranged inside the housing (100). The bottom support plate (300) is made of a hot melt adhesive material. The battery cell (200) is carried on the bottom support plate (300), and the battery cell (200) is adhesively fixed to the housing (100) through the bottom support plate (300) during the process of hot melt solidification.

2. The battery according to claim 1, wherein The melting point of the hot melt adhesive material is 50°C - 150°C.

3. The battery according to claim 1, characterized in that, The hot melt adhesive material is a polymer hot melt adhesive, including: one or more of ethylene and its copolymer hot melt adhesives, polyurethane hot melt adhesives, polyamide hot melt adhesives, polyester hot melt adhesives, and polyolefin hot melt adhesives.

4. The battery according to claim 1, wherein On one side of the bottom support plate (300) facing the battery cell (200), there are a first step surface (310), a second step surface (320) and a third step surface (330) with a height difference. Along the height direction of the battery (10), the heights of the first step surface (310), the second step surface (320) and the third step surface (330) decrease in sequence, and the battery cell (200) is partially carried on the second step surface (320).

5. The battery according to claim 4, characterized in that, On the third step surface (330), a plurality of support ribs (331) are arranged at intervals along a first direction. The battery cell (200) is partially carried on the plurality of support ribs (331). The support ribs (331) extend along a second direction. Wherein, the bottom support plate (300) is a rectangular body, the first direction is the width direction of the bottom support plate (300), and the second direction is the length direction of the bottom support plate (300).

6. The battery according to claim 5, characterized in that, The battery cell (200) includes stacked electrode plates and separators, and part of the separators extends into the gaps between two adjacent support ribs (331).

7. The battery according to claim 5, characterized in that, Two first blocking surfaces (340) are relatively arranged on the bottom support plate (300) along the first direction, and two second blocking surfaces (350) are relatively arranged on the bottom support plate (300) along the second direction. The first blocking surfaces (340) are connected between the first step surface (310) and the third step surface (330), and the second blocking surfaces (350) are connected between the second step surface (320) and the third step surface (330). An accommodation groove (360) for storing electrolyte is formed between the two first blocking surfaces (340) and the two second blocking surfaces (350), and the plurality of support ribs (331) are located in the accommodation groove (360).

8. The battery according to claim 4, characterized in that, The ratio of the distance between the first step surface (310) and the second step surface (320) to the height of the bottom support plate (300) is 0.4 - 0.5; the ratio of the distance between the first step surface (310) and the third step surface (330) to the height of the bottom support plate (300) is 0.5 - 0.

8.

9. The battery according to claim 4, characterized in that, The bottom plate (300) is provided with two limiting surfaces (370) oppositely along a second direction perpendicular to the first direction. The limiting surfaces (370) are connected between the first step surface (310) and the second step surface (320). Along the second direction, two opposite side surfaces of the battery cell (200) are respectively attached to the two limiting surfaces (370). Wherein, the bottom plate (300) is a rectangular body, the first direction is the width direction of the bottom plate (300), and the second direction is the length direction of the bottom plate (300).

10. An electrical device, characterized in that, Comprising the battery according to any one of claims 1-9.

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