Battery protection structure, battery, electric device, and manufacturing method and apparatus of battery

Abstract

The embodiment of the application relates to the battery technical field, and provides a battery protection structure, a battery, a power utilization device, and a method and equipment for manufacturing a battery. The battery protection structure comprises a substrate, the substrate comprises a first surface and a second surface, the first surface is used for arranging a plurality of battery monomers, the battery monomer comprises a plurality of side walls, and the plurality of side walls are configured to be arranged perpendicularly to the substrate; a force transmission piece is arranged on the substrate, one end of the force transmission piece is connected to the second surface, and the other end of the force transmission piece extends away from the second surface; and in the arrangement direction of the first surface and the second surface, the connection position of the force transmission piece and the second surface is configured to correspond to at least part of the side walls. Through the above mode, the impact force of the bottom ball hit can be transmitted to the side wall of the battery monomer which is not prone to deformation through the force transmission piece, so that the internal short circuit of the battery caused by the bottom ball hit can be prevented, and the safety of the battery is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery protection structure, a battery, an electrical device, and a method and equipment for manufacturing the battery. Background Technology

[0002] Lithium-ion batteries have been widely used in power battery systems for electronic devices such as computers and mobile phones, as well as new energy vehicles, in recent years due to their advantages such as high energy density, high power density, long lifespan, and environmental friendliness.

[0003] In new energy vehicles, batteries are mostly installed at the bottom of the car. The bottom surface of the battery is large and not protected by the vehicle body structure, making it susceptible to scraping and impacts during vehicle operation—a situation commonly referred to as "bottom scraping" or "bottom ball strike." Due to the limited internal space of the battery and the small gap between the battery base and the individual battery cells, a bottom ball strike can easily cause deformation of the battery cells, leading to internal short circuits, fires, or even explosions, endangering life and property. Therefore, how to protect the bottom of the battery is a pressing issue that needs to be addressed. Summary of the Invention

[0004] In view of the above problems, embodiments of this application provide a battery protection structure, a battery, an electrical device, and a method and equipment for manufacturing the battery, which can prevent the deformation of battery cells, reduce the probability of internal short circuits in battery cells, and improve the safety performance of the battery.

[0005] According to a first aspect of the present application, a battery protection structure is provided, comprising: a substrate, the substrate including a first surface and a second surface, the first surface for arranging a plurality of battery cells, the battery cells including a plurality of sidewalls, the plurality of sidewalls being configured to be perpendicular to the substrate; a force transmission member disposed on the substrate, one end of the force transmission member being connected to the second surface, and the other end of the force transmission member extending in a direction away from the second surface; in the arrangement direction of the first surface and the second surface, the connection between the force transmission member and the second surface is configured to correspond to at least a portion of the sidewalls.

[0006] This embodiment of the application provides a force transmission member on the side of the substrate on which the battery cells are arranged, away from the battery cells. The position of the force transmission member corresponds to at least a portion of the sidewall of the battery cell that is perpendicular to the substrate. The force transmission member can transmit the impact force of the bottom ball strike to the corner between the sidewall and the bottom wall of the battery cell. The sidewall perpendicular to the substrate provides greater rigidity to the corner between the sidewall and the bottom wall. After the impact force is transmitted to the sidewall through the corner, the sidewall is less likely to deform, thereby preventing internal short circuits in the battery caused by the bottom ball strike and improving battery safety.

[0007] In some embodiments, the connection between the force transmission member and the second surface is projected onto the first surface in a first projection that covers at least a portion of the sidewall's second projection onto the first surface.

[0008] By using the first projection of the connection between the force transmission member and the second surface on the first surface to cover at least part of the second projection of the sidewall on the first surface, the impact force transmitted to the connection between the force transmission member and the second surface can be transmitted to the sidewall corresponding to the force transmission member, preventing the impact force from directly impacting the bottom wall of the battery cell parallel to the substrate, causing deformation of the bottom wall and resulting in a short circuit inside the battery.

[0009] In some embodiments, along a first direction, the distance L, where 0 ≤ L ≤ 10 mm, is offset from the center of the first projection of the connection between the force transmission member and the second surface on the first surface from at least a portion of the outer edge of the second projection of the sidewall on the first surface, and the first direction is parallel to the first surface.

[0010] When 0≤L≤10mm, it can ensure that there is no deviation or a small deviation between the center of the first projection and the outer edge of the second projection. This allows the force transmission position between the force transmission component and the side wall to be located at the center of the force transmission component along the first direction or at a position close to the center, thereby improving the rigidity of the force transmission component, making it less prone to deformation, and ensuring the force transmission effect.

[0011] In some embodiments, the force transmission member and the substrate have a first included angle θ1, wherein the first included angle θ1 satisfies: 30°≤θ1≤60°.

[0012] By setting a first included angle θ1 within the range of 30° to 60°, most or all of the impact force can be transmitted to the side wall through the force transmission component, thereby improving the effectiveness of impact force transmission.

[0013] In some embodiments, the force transmission element has an inverted V-shaped structure.

[0014] The lower dimension of the inverted V-shaped structure is larger than the upper dimension. Its larger lower dimension covers a larger area of ​​the battery's bottom, thus transferring the impact force received at the bottom of the battery to the sidewalls as much as possible. The smaller upper dimension of the inverted V-shaped structure allows the impact force to be transferred more concentratedly to the corresponding sidewall.

[0015] In some embodiments, the force transmission member includes a first force transmission portion and a second force transmission portion respectively connected to the second surface, wherein the projections of the first force transmission portion and the second force transmission portion at the intersection with the second surface cover at least a portion of the second projection of the sidewall on the first surface.

[0016] The impact force is transmitted to the substrate through the first force transmission part and the second force transmission part respectively. The projection of the first force transmission part and the second force transmission part at the intersection with the second surface covers at least part of the second projection of the sidewall on the first surface. The impact force transmitted to the intersection of the first force transmission part and the second force transmission part with the second surface on the substrate can be transmitted to the sidewall corresponding to the force transmission member. This prevents the impact force from directly impacting the bottom wall of the battery cell parallel to the substrate, causing deformation of the bottom wall and resulting in a short circuit inside the battery.

[0017] In some embodiments, the force transmission member further includes a reinforcing portion disposed between the first force transmission portion and the second force transmission portion, and connecting the first force transmission portion and the second force transmission portion.

[0018] By providing a reinforcing part connecting the first force transmission part and the second force transmission part, the rigidity of the force transmission component can be improved, making it less prone to deformation. For example, it can prevent the force transmission component from being flattened when the impact force is large, thus ensuring the force transmission effect.

[0019] In some embodiments, a plurality of force transmission elements are provided along a first direction, and the distance between two adjacent force transmission elements is less than or equal to 1 / 3 of the size of the battery cell along the first direction, wherein the first direction is parallel to the first surface.

[0020] By setting the distance between two adjacent force transmission components to be less than or equal to 1 / 3 of the size of the battery cell along the second direction, the area covered by the lower end of the force transmission component is greater than or equal to 2 / 3 of the bottom wall area of ​​the battery cell, thereby enabling the force transmission component to transmit most of the impact force from the bottom ball hitting the bottom area of ​​the battery.

[0021] In some embodiments, the connection between the force transmission member and the second surface is configured to correspond to the first sidewall with the smaller area among the plurality of sidewalls.

[0022] By configuring the connection between the force transmission component and the second surface as the first sidewall with the smaller area among the plurality of sidewalls, the impact force of the bottom ball strike on the bottom area of ​​the battery is transmitted to the first sidewall with the smaller area. The first sidewall with the smaller area is less likely to deform when subjected to force than the sidewall with the larger area, thus improving the safety of the battery. In addition, fewer force transmission components can be set, resulting in a simple structure and cost savings.

[0023] In some embodiments, the battery protection structure is made of a resin-based composite material.

[0024] By using resin-based composite materials as the material for the battery protection structure, the rigidity of the battery protection structure can be improved, making the force transmission components less prone to deformation and ensuring the force transmission effect.

[0025] In some embodiments, the thermal conductivity of the battery protection structure is less than or equal to 0.5 W / m·°C.

[0026] Since the thermal conductivity of the battery protection structure is less than or equal to 0.5 W / m·°C, the battery protection structure has a certain heat preservation performance. When a thermal management component is set between the battery cell and the battery protection structure, the thermal management efficiency of the thermal management component can be guaranteed.

[0027] According to a second aspect of the present application, a battery is provided, including a plurality of battery cells and the battery protection structure of the above embodiment, wherein the battery cells are disposed on the first surface.

[0028] In some embodiments, the battery further includes a thermal management component disposed between the battery protection structure and the plurality of battery cells.

[0029] By providing a thermal management component between the battery protection structure and the multiple battery cells, thermal management of the battery cells can be performed, such as cooling the battery cells.

[0030] According to a third aspect of the embodiments of this application, an electrical device is provided, including the battery of the above embodiments, wherein the battery is used to provide electrical energy.

[0031] According to a fourth aspect of the present application, a method for manufacturing a battery is provided, comprising: providing a substrate, the substrate including a first surface and a second surface; providing a plurality of battery cells, the battery cells including a plurality of sidewalls; providing a force transmission member; disposing the force transmission member on the substrate, one end of the force transmission member being connected to the second surface, and the other end of the force transmission member extending in a direction away from the second surface; arranging the plurality of battery cells on the first surface such that the sidewalls of the battery cells are perpendicular to the substrate, and in the arrangement direction of the first surface and the second surface, the connection point of the force transmission member with the second surface corresponds to at least a portion of the sidewalls.

[0032] According to a fifth aspect of the present application, a battery manufacturing apparatus is provided, comprising: a first providing device configured to provide a substrate, the substrate including a first surface and a second surface; a second providing device configured to provide a plurality of battery cells, the battery cells including a plurality of sidewalls; a third providing device configured to provide a force transmission member; a first assembly device configured to dispose of the force transmission member on the substrate, one end of the force transmission member being connected to the second surface, and the other end of the force transmission member extending in a direction away from the second surface; and a second assembly device configured to arrange the plurality of battery cells on the first surface such that the sidewalls of the battery cells are perpendicular to the substrate, and in the arrangement direction of the first surface and the second surface, the connection between the force transmission member and the second surface corresponds to at least a portion of the sidewalls.

[0033] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0034] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0035] Figure 1 These are schematic diagrams of the vehicle structure provided in some embodiments of this application;

[0036] Figure 2 These are exploded schematic diagrams of batteries provided in some embodiments of this application;

[0037] Figure 3 yes Figure 2 A schematic diagram of the battery module in the diagram;

[0038] Figure 4 This is a schematic diagram showing the interaction between the battery protection structure and the battery cell provided in some embodiments of this application;

[0039] Figure 5 This is a schematic diagram of the battery protection structure provided in some embodiments of this application;

[0040] Figure 6 This is a schematic diagram of the battery protection structure provided in some embodiments of this application from another angle;

[0041] Figure 7 This is a front view schematic diagram of the battery protection structure and battery cell provided in some embodiments of this application;

[0042] Figure 8 yes Figure 7 Enlarged view of section A in the middle;

[0043] Figure 9 This is a schematic diagram showing the interaction between the battery protection structure and the battery cell provided in some embodiments of this application;

[0044] Figure 10 This is a front view schematic diagram of the battery protection structure and battery cell provided in some embodiments of this application;

[0045] Figure 11 yes Figure 10 A partial schematic diagram;

[0046] Figure 12 This is a schematic diagram of the cross-sectional structure of the force transmission element in some embodiments of this application;

[0047] Figure 13 This is an exploded schematic diagram of a battery protection structure provided in some embodiments of this application;

[0048] Figure 14 This is an exploded view of a battery protection structure provided in other embodiments of this application;

[0049] Figure 15 This is an exploded view of a battery protection structure provided in other embodiments of this application;

[0050] Figure 16 These are exploded schematic diagrams of batteries provided in some embodiments of this application;

[0051] Figure 17 This is a schematic flowchart of a battery manufacturing method provided in some embodiments of this application;

[0052] Figure 18 This is a schematic diagram of the structure of a battery manufacturing apparatus provided in some embodiments of this application.

[0053] The accompanying drawings are not necessarily drawn to scale.

[0054] Figure label:

[0055] 1-Vehicle, 2-Battery, 3-Controller, 4-Motor, 5-Battery cell, 6-Battery module; 7-Battery protection structure, 8-Thermal management components, 9-Box;

[0056] 91-First box section, 92-Second box section, 93-Accommodation space;

[0057] 51-Side wall, 51a-First side wall, 51b-Second side wall, 52-Top wall;

[0058] 71-Baseboard, 711-Mother plate, 712-Attached plate, 72-Force transmission component, 721-First force transmission part, 722-Second force transmission part, 723-Reinforcing part;

[0059] 10-Manufacturing equipment; 11-First supply device; 12-Second supply device; 13-Third supply device; 14-Assembly device;

[0060] S1 - First surface, S2 - Second surface;

[0061] R - The connection between the force transmission component and the second surface;

[0062] P1 - First projection, P2 - Second projection;

[0063] L - the distance between the center of the first projection and the outer edge of the second projection; L1 - the distance between two adjacent force transmission components; L2 - the size of the battery cell along the second direction.

[0064] θ1 - First included angle θ1;

[0065] X - First direction, Y - Direction perpendicular to X in a plane parallel to the substrate, Z - Direction perpendicular to the substrate. Detailed Implementation

[0066] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0067] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0068] It should be noted that, unless otherwise stated, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by those skilled in the art to which the embodiments of this application pertain.

[0069] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0070] Furthermore, technical terms such as "first" and "second" are used for descriptive purposes only and should not be interpreted as indicating or implying relative importance or implicitly specifying the number of technical features indicated, nor are they used to describe a specific order or primary / secondary relationship.

[0071] In this article, the term "and / or" simply describes the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0072] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two).

[0073] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0074] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments. Those skilled in the art will understand that the embodiments described herein can be combined with other embodiments.

[0075] In this field, battery cells (also known as battery modules) can be categorized into primary battery cells and rechargeable battery cells based on whether they are rechargeable. Primary battery cells are commonly referred to as "use-and-discard" batteries or galvanic cells because they cannot be recharged after their charge is depleted and must be discarded. Rechargeable battery cells are also known as secondary batteries, secondary batteries, or storage batteries. The materials and manufacturing processes of rechargeable battery cells differ from those of primary battery cells. Their advantages include the ability to be cycled multiple times after charging, and a higher output current capacity than most primary battery cells. Currently, common types of rechargeable battery cells include lead-acid battery cells, nickel-metal hydride battery cells, and lithium-ion battery cells. Lithium-ion battery cells have advantages such as light weight, large capacity (1.5 to 2 times that of a nickel-metal hydride battery of the same weight), no memory effect, and a very low self-discharge rate. Therefore, despite their relatively higher price, they are still widely used.

[0076] The battery mentioned in this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery module or a battery pack. A battery cell may include a lithium-ion rechargeable battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, etc. A battery cell may be flat, cuboid, or other shapes. Battery cells are generally classified as hard-shell battery cells and pouch battery cells.

[0077] A battery cell, consisting of a positive electrode, a negative electrode, an electrolyte, and a separator, is the basic structural unit that makes up a battery module and battery pack. Common positive electrode materials for lithium-ion batteries include lithium cobalt oxide, lithium manganese oxide, lithium nickel oxide, lithium iron phosphate, and ternary materials (such as lithium nickel cobalt manganese oxide). Common negative electrode materials include carbon materials (such as graphite) and silicon-based materials. Common separator materials include polyolefin materials, primarily polyethylene (PE) or polypropylene (PP). Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, prismatic battery cells, and pouch battery cells.

[0078] Multiple battery cells can be connected in series and / or parallel via electrode terminals for various applications. In high-power applications such as electric vehicles, battery applications involve three levels: battery cells, battery modules, and battery packs. A battery module is formed by electrically connecting a certain number of battery cells together and placing them in a frame to protect them from external shocks, heat, vibration, etc. A battery pack is the final state of the battery system installed in a vehicle. Currently, most battery packs are made by assembling a Battery Management System (BMS), thermal management components, and other control and protection systems onto one or more battery modules. With technological advancements, the battery module level can be omitted, meaning that battery packs can be formed directly from battery cells. This improvement increases the gravimetric and volumetric energy density of the battery system while significantly reducing the number of components. The batteries mentioned in this application include battery modules or battery packs.

[0079] In new energy vehicles, batteries are mostly installed at the bottom of the car. The bottom surface of the battery is large and not protected by the vehicle body structure, making it susceptible to scraping and impacts during vehicle operation—a situation commonly referred to as "bottom scraping" or "bottom ball strike." Due to the limited internal space of the battery and the small gap between the battery base and the individual battery cells, a bottom ball strike can easily cause deformation of the battery cells, leading to internal short circuits, fires, or even explosions, endangering life and property. Therefore, how to protect the bottom of the battery is a pressing issue that needs to be addressed.

[0080] In view of this, this application provides a battery protection structure. This battery protection structure provides a force transmission member on the side of the substrate on which the battery cells are arranged, away from the battery cells. The position of the force transmission member corresponds to at least a portion of the sidewall of the battery cell that is perpendicular to the substrate. The force transmission member can transmit the impact force of a bottom ball strike to the corner between the sidewall and the bottom wall of the battery cell. The sidewall perpendicular to the substrate provides greater rigidity to the corner between the sidewall and the bottom wall. After the impact force is transmitted to the sidewall through the corner, the sidewall is less likely to deform, thereby preventing internal short circuits in the battery caused by bottom ball strikes and improving battery safety.

[0081] The battery protection structure described in this application is applicable to batteries and electrical devices that use batteries.

[0082] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0083] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0084] Please see Figure 1 , Figure 1 These are schematic diagrams of the vehicle structure provided in some embodiments of this application. For example... Figure 1 As shown, a battery 2 is installed inside the vehicle 1. The battery 2 refers to a single physical module comprising one or more battery cells 5 to provide higher voltage and capacity. For example, the battery 2 mentioned in this application may include a battery module 6 or a battery pack. The battery 2 may be located at the bottom, front, or rear of the vehicle 1. The battery 2 can be used to power the vehicle 1; for example, the battery 2 can serve as the operating power source for the vehicle 1. The vehicle 1 may also include a controller 3 and a motor 4. The controller 3 is used to control the battery 2 to supply power to the motor 4, for example, to meet the power needs of the vehicle 1 during starting, navigation, and driving.

[0085] In some embodiments of this application, the battery 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0086] Figure 2 These are exploded schematic diagrams of batteries provided in some embodiments of this application. For example... Figure 2 As shown, battery 2 includes multiple battery cells 5 and a battery protection structure 7.

[0087] In some embodiments, a plurality of battery cells in battery 2 constitute battery module 6, and battery 2 further includes housing 9, in which battery module 6 is housed.

[0088] The housing 9 is used to house the battery module 6, and the housing 9 can have various structures. In some embodiments, the housing 9 may include a first housing portion 91 and a second housing portion 92, which overlap each other, and together define a receiving space 93 for housing the battery module 6. The second housing portion 92 may be a hollow structure with one end open, and the first housing portion 91 may be a plate-like structure, with the first housing portion 91 covering the open side of the second housing portion 92 to form a housing 9 with the receiving space 93; alternatively, both the first housing portion 91 and the second housing portion 92 may be hollow structures with one side open, with the open side of the first housing portion 91 covering the open side of the second housing portion 92 to form a housing 9 with the receiving space 93. Of course, the first housing portion 91 and the second housing portion 92 can have various shapes, such as cylinders, cuboids, etc.

[0089] To improve the sealing performance after the first housing part 91 and the second housing part 92 are connected, a sealing element, such as sealant or sealing ring, can also be provided between the first housing part 91 and the second housing part 92.

[0090] Assuming that the first box section 91 covers the top of the second box section 92, the first box section 91 can also be called the upper box cover, and the second box section 92 can also be called the lower box.

[0091] In battery 2, there are multiple battery cells 5. These multiple battery cells 5 can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 5 are connected in both series and parallel. Multiple battery cells 5 can be directly connected in series, parallel, or in a mixed manner, and then the whole assembly of multiple battery cells 5 is housed in the housing 9. Alternatively, multiple battery cells 5 can first be connected in series, parallel, or in a mixed manner to form a battery module 6, and then multiple battery modules 6 can be connected in series, parallel, or in a mixed manner to form a whole assembly, which is then housed in the housing 9.

[0092] Figure 3 yes Figure 2 A schematic diagram of the battery module in the diagram. (See attached diagram.) Figure 3 As shown, in some embodiments, there are multiple battery cells 5, which are first connected in series, parallel, or mixed to form a battery module 6. The multiple battery modules 6 are then connected in series, parallel, or mixed to form a whole and housed in a casing.

[0093] The battery protection structure 7 of some embodiments of this application will be described in detail below.

[0094] Figure 4 This is a schematic diagram illustrating the interaction between the battery protection structure and a single battery cell provided in some embodiments of this application. Figure 5 This is a schematic diagram of the battery protection structure provided in some embodiments of this application. Figure 6This is a schematic diagram of the battery protection structure provided in some embodiments of this application from another angle. Figure 7 This is a front view schematic diagram of the battery protection structure and battery cell provided in some embodiments of this application. Figure 8 yes Figure 7 Enlarged view of section A.

[0095] Please see Figures 4 to 6 This application provides a battery protection structure 7, which includes a substrate 71 and a force transmission member 72. The substrate 71 includes a first surface S1 and a second surface S2. The first surface S1 is used to arrange a plurality of battery cells 5, and the battery cells 5 include a plurality of sidewalls 51, which are configured to be perpendicular to the substrate 71. The force transmission member 72 is disposed on the substrate 71, one end of the force transmission member 72 is connected to the second surface S2, and the other end of the force transmission member 72 extends in a direction away from the second surface S2. In the arrangement direction of the first surface S1 and the second surface S2, the connection between the force transmission member 72 and the second surface S2 (e.g., Figure 8 The R region shown is configured to correspond to at least a portion of the sidewall 51.

[0096] In the figure, the X direction is the first direction, the Y direction is the direction perpendicular to X in the plane parallel to the substrate 71, and the Z direction is the direction perpendicular to the substrate 71.

[0097] In the specific embodiment shown in the figure, the substrate 71 has a plate-like structure, and the first surface S1 and the second surface S2 are the larger surfaces in the plate-like structure, both of which are arranged parallel to the XOY plane. The arrangement direction of the first surface S1 and the second surface S2 is the Z direction.

[0098] The battery cell 5 includes a top wall 52, a bottom wall (not shown in the figure), and multiple side walls 51. The top wall 52 and the bottom wall are parallel to the substrate 71 (i.e., parallel to the XOY plane), and the side walls 51 are perpendicular to the substrate 71 (i.e., perpendicular to the XOY plane). In the wall surface of the battery cell 5, the side wall 51 perpendicular to the substrate 71 is equivalent to a reinforcing rib structure between the bottom wall and the top wall 52 of the battery cell 5. Therefore, the rigidity at the side wall 51 is relatively large, and it is not easily damaged or deformed by impact force.

[0099] In the specific embodiment shown in the figure, the battery cell 5 is in contact with the first surface S1 of the substrate 71, and can be fixed to the first surface S1 by adhesive (using adhesive or backing adhesive) or welding. Those skilled in the art should understand that the figure is only an example, and in other embodiments, the battery cell 5 may not be in contact with the first surface S1. For example, when a thermal management component or other component is provided between the battery cell 5 and the substrate 71, the battery cell 5 does not directly contact the first surface S1.

[0100] The connection between one end of the force transmission component 72 and the second surface S2 of the substrate 71 can be achieved by adhesive bonding (using adhesive or backing glue) or welding. "The direction away from the second surface S2" refers to the direction that has a certain angle with the XOY plane and faces the negative Z-axis direction.

[0101] The welding method described above can be hot plate welding or laser welding. By fixing the battery cell 5 and the substrate 71, as well as fixing the substrate 71 and the force transmission component 72, through adhesive bonding or welding, bolts or other fasteners can be eliminated, saving costs and improving efficiency.

[0102] Please see Figure 7 and Figure 8 The connection between the force transmission member 72 and the second surface S2 is region R. The connection R between the force transmission member 72 and the second surface S2 is configured to correspond to at least a portion of the sidewall 51, where "corresponds" means that the projection of region R in the Z-axis direction coincides or substantially coincides with the projection of sidewall 51 in the Z-axis direction.

[0103] The sidewall 51 includes a pair of larger second sidewalls 51b and a pair of smaller first sidewalls 51a. "At least part of the sidewalls 51" refers to one or more sidewalls of the sidewalls 51, such as a single sidewall, two adjacent sidewalls, two opposing sidewalls, or all sidewalls. Correspondingly, the force transmission member 72 also has a correspondence with the sidewalls 51. For example, the force transmission member 72 corresponds to a single sidewall of the battery cell 5, the force transmission member 72 corresponds to two adjacent sidewalls of the battery cell 5, the force transmission member 72 corresponds to two opposing sidewalls of the battery cell 5, or the force transmission member 72 corresponds to all sidewalls of the battery cell 5, and so on.

[0104] In this embodiment, a force transmission member 72 is provided on the side of the substrate 71 where the battery cells 5 are arranged, away from the battery cells 5. The position of the force transmission member 72 corresponds to at least a portion of the side wall 51 of the battery cell 5 that is perpendicular to the substrate 71. The force transmission member 72 can transmit the impact force of the bottom ball strike to the corner between the side wall 51 and the bottom wall of the battery cell 5. The side wall 51 perpendicular to the substrate 71 provides greater rigidity to the corner between the side wall 51 and the bottom wall. After the impact force is transmitted to the side wall 51 through the corner, the side wall 51 is less likely to deform, thereby preventing internal short circuits in the battery caused by the bottom ball strike and improving battery safety.

[0105] Please continue reading. Figure 2 Regarding the installation of the battery protection structure 7 inside the housing 9 of the battery 2, the battery protection structure 7 can be directly fixed to the bottom of the second housing part 92, or a bottom protective plate (not shown in the figure) can be installed at the bottom of the second housing part 92 to fix the battery protection structure 7 to the bottom protective plate.

[0106] Please see Figure 8In some embodiments, the connection point R between the force transmission member 72 and the second surface S2 is the first projection P1 of the first surface S1, which covers at least part of the sidewall 51 and the second projection P2 of the first surface S1.

[0107] Both the first projection P1 and the second projection P2 are orthographic projections along the Z-axis. The first projection P1 "covers" the second projection P2, meaning that the second projection P2 is located within the area of ​​the first projection P1, or coincides with the first projection P1.

[0108] By using the connection point R between the force transmission member 72 and the second surface S2 to the first projection P1 of the first surface S1, and the second projection P2 of the sidewall 51 covering at least part of the first surface S1, the impact force transmitted to the connection point between the force transmission member 72 and the second surface S2 can be transmitted to the sidewall 51 corresponding to the force transmission member 72, preventing the impact force from directly impacting the bottom wall of the battery cell 5 parallel to the substrate, causing deformation of the bottom wall and resulting in a short circuit inside the battery.

[0109] Please continue reading. Figure 4 and Figure 7 In some embodiments, the connection R between the force transmission member 72 and the second surface S2 is configured to correspond to the first sidewall 51a with the smaller area among the plurality of sidewalls 51.

[0110] As mentioned above, the sidewall 51 includes a larger second sidewall 51b and a smaller first sidewall 51a. By configuring the connection point R between the force transmission member 72 and the second surface S2 to correspond to the smaller first sidewall 51a among the multiple sidewalls 51, the impact force from the bottom ball strike on the bottom region of the battery is transmitted to the smaller first sidewall 51a. The smaller first sidewall 51a is less prone to deformation when subjected to force compared to the larger first sidewall, thus improving the safety of the battery.

[0111] Furthermore, by configuring the connection point R between the force transmission element 72 and the second surface S2 as the first sidewall 51a with the smaller area among the multiple sidewalls 51, a smaller number of force transmission elements 72 can be set, resulting in a simple structure and cost savings.

[0112] Figure 9 This is a schematic diagram showing the interaction between the battery protection structure and the battery cell provided in some embodiments of this application. Figure 10 These are frontal view schematic diagrams illustrating the interaction between the battery protection structure and a single battery cell, provided in some embodiments of this application. For example... Figure 9 and Figure 10 As shown, the connection between the force transmission component 72 and the second surface S2 is set at the second side wall 51b with the larger area among multiple side walls. In order to ensure a better impact force transmission effect, a large number of force transmission components 72 need to be set.

[0113] For example, for 16 battery cells arranged in 8 rows and 2 columns, if according to Figure 9 As shown, corresponding to the first sidewall 51a, the connection point R between the force transmission member 72 and the second surface S2 is configured as the second sidewall 51b with the larger area among the multiple sidewalls 51, requiring 9 force transmission members 72; if according to Figure 4 As shown, the connection point R between the force transmission member 72 and the second surface S2 is configured as the first sidewall 51a with the smaller area among the multiple sidewalls 51, so only 3 force transmission members are needed. Figure 4 The embodiment shown reduces the number of force transmission components 72.

[0114] Please continue reading. Figure 8 In some embodiments, along the first direction X, the distance L at the connection point R between the force transmission member 72 and the second surface S2 is offset from the center of the first projection P1 of the first surface S1 by at least a portion of the sidewall 51 at the outer edge of the second projection P2 of the first surface S1, where 0 ≤ L ≤ 10 mm, and the first direction X is parallel to the first surface S1.

[0115] Figure 8 The illustrated embodiment is one where the connection between the force transmission member and the second surface corresponds to the smaller of the multiple sidewalls, specifically the first sidewall. For embodiments where the connection between the force transmission member and the second surface corresponds to the larger of the multiple sidewalls, for example… Figure 9 and Figure 10 Please refer to the embodiments shown. Figure 11 As shown, with Figure 8 Similarly, as shown, in Figure 11 In the first direction X, the connection point R between the force transmission member 72 and the second surface S2 is offset from the center of the first projection P1 on the first surface S1 by at least a portion of the sidewall 51 at the outer edge of the second projection P2 on the first surface S1 by a distance L, 0≤L≤10mm, and the first direction X is parallel to the first surface S1.

[0116] When the sidewall 51 is 0≤L≤10mm, it can ensure that there is no deviation or a small deviation distance L between the center of the first projection P1 and the outer edge of the second projection P2. This allows the force transmission position between the force transmission component 72 and the sidewall 51 to be located at the center of the force transmission component 72 along the first direction X or at a position close to the center. This improves the rigidity of the force transmission component 72, makes the force transmission component 72 less prone to deformation, and ensures the force transmission effect.

[0117] In some embodiments, multiple force transmission elements 72 are provided along the first direction X, and the distance L1 between two adjacent force transmission elements 72 is less than or equal to 1 / 3 of the size L2 of the battery cell 5 along the first direction X.

[0118] Please see Figure 7In the embodiment shown in the figure, the dimension L2 of the battery cell 5 along the first direction X is the length of the battery cell 5. The distance L1 between two adjacent force transmission members 72 is less than or equal to 1 / 3 of the length of the battery cell 5.

[0119] Please see Figure 11 In the embodiment shown in the figure, the dimension L2 of the battery cell 5 along the first direction X is the width of the battery cell 5. The distance L1 between two adjacent force transmission members 72 is less than or equal to 1 / 3 of the width of the battery cell 5.

[0120] By setting the distance L1 between two adjacent force transmission components 72 to be less than or equal to 1 / 3 of the size L2 of the battery cell 5 along the first direction X, the area covered by the lower end of the force transmission component 72 is greater than or equal to 2 / 3 of the bottom wall area of ​​the battery cell 5, so that the force transmission component 72 can transmit most of the impact force of the bottom ball on the bottom area of ​​the battery.

[0121] Please continue reading. Figure 8 In some embodiments, the force transmission member 72 and the substrate 71 have a first included angle θ1, which satisfies: 30°≤θ1≤60°.

[0122] If the first included angle θ1 is too large, the area covered by the force transmission component 72 at the bottom of the battery will be too small, and some of the impact force will not be transmitted to the side wall 51 through the force transmission component 72, causing deformation of the battery cell 5. If the first included angle θ1 is too small, the impact force on the central area of ​​the bottom of the battery covered by the force transmission component 72 will not be transmitted to the side wall 51 through the force transmission component 72, causing deformation of the battery cell 5. Therefore, by setting the first included angle θ1 within the range of 30° to 60°, most or all of the impact force can be transmitted to the side wall 51 through the force transmission component 72, improving the effectiveness of impact force transmission.

[0123] Please see Figure 4 and Figure 7 In some embodiments, the force transmission element 72 has an inverted V-shaped structure.

[0124] The lower end of the inverted V-shaped structure (the end connected to the second surface S2) is larger than the upper end. Its larger lower end (the other end extending away from the second surface S2) can cover a larger area of ​​the battery bottom, thus transferring the impact force received at the battery bottom to the sidewall 51 as much as possible. The smaller upper end of the inverted V-shaped structure can concentrate the impact force to the corresponding sidewall 51.

[0125] Figure 4 and Figure 7 The force transmission component 72 shown has an inverted V-shaped structure. Figure 12This is a schematic diagram of the cross-sectional structure of the force transmission element in some embodiments of this application. Those skilled in the art should understand that in other embodiments, the force transmission element 72 may also be other structures, such as... Figure 12 The cross-section shown in (a) is a trapezoidal prism, or Figure 12 The combination of the inverted V-shape and plate-like structure shown in (b), or Figure 12 The wave-like structure shown in (c) may be another type of structure. Figure 12 In some of the embodiments shown, by setting the lower end of the force transmission member 72 to a larger size, a larger area of ​​the bottom of the battery can be covered, thereby transferring the impact force on the bottom of the battery to the side wall 51 as much as possible. By setting the upper end of the force transmission member 72 to a smaller size, the impact force can be transferred to the corresponding side wall 51 in a more concentrated manner.

[0126] Please continue reading. Figure 6 and Figure 8 The force transmission component 72 includes a first force transmission part 721 and a second force transmission part 722 respectively connected to the second surface S2. The projection of the first force transmission part 721 and the second force transmission part 722 at the intersection with the second surface S2 (i.e., the first projection P1) covers at least part of the sidewall 51's second projection P2 on the first surface S1.

[0127] The impact force is transmitted to the substrate 71 through the first force transmission part 721 and the second force transmission part 722 respectively. The projection P1 at the intersection of the first force transmission part 721 and the second force transmission part 722 with the second surface S2 covers at least part of the second projection P2 of the sidewall 51 on the first surface S1. The impact force transmitted to the intersection of the first force transmission part 721 and the second force transmission part 722 with the second surface S2 on the substrate 71 can be transmitted to the sidewall 51 corresponding to the force transmission member 72, preventing the impact force from directly impacting the bottom wall of the battery cell 5 parallel to the substrate 71, causing deformation of the bottom wall and resulting in a short circuit inside the battery.

[0128] Please continue reading. Figure 6 In some embodiments, the force transmission member 72 further includes a reinforcing part 723, which is disposed between the first force transmission part 721 and the second force transmission part 722 and connects the first force transmission part 721 and the second force transmission part 722.

[0129] By providing a reinforcing part 723 connecting the first force transmission part 721 and the second force transmission part 722, the rigidity of the force transmission member 72 can be improved, making the force transmission member 72 less prone to deformation. For example, it can prevent the force transmission member 72 from being flattened when the impact force is large, thus ensuring the force transmission effect.

[0130] like Figure 6As shown, the reinforcing part 723 has a plate-like structure, and there is no gap between it and the first force-transmitting part 721 and the second force-transmitting part 722, thus achieving a good reinforcing effect. Those skilled in the art should understand that in other embodiments, the reinforcing part 723 can also be other structures, such as a block structure or a rib structure, as long as it can improve the rigidity of the force-transmitting member 72.

[0131] Figure 13 This is an exploded view of a battery protection structure provided in some embodiments of this application. Please refer to... Figure 13 The substrate 71 includes a mother plate 711 and multiple auxiliary plates 712. Force transmission components 72 are mounted on the auxiliary plates 712. The multiple auxiliary plates 712 with force transmission components 72 are mounted on the mother plate 711 to form a battery protection structure 7. This method first installs a single force transmission component 72 on a smaller auxiliary plate 712, which is more convenient. Then, the auxiliary plates 712 with force transmission components 72 are fixed to the mother plate 711, which improves the stability of the battery protection structure 7.

[0132] Figure 14 This is an exploded view of a battery protection structure provided in other embodiments of this application. Please refer to... Figure 14 The substrate 71 includes multiple attachment plates 712, on which force transmission components 72 are mounted. The multiple attachment plates 712 with the force transmission components 72 mounted are then assembled together to form a battery protection structure 7. This method, compared to... Figure 13 The embodiment shown does not include a motherboard 711, which saves materials, costs, and installation procedures, and improves installation efficiency.

[0133] Figure 15 This is an exploded view of a battery protection structure provided in other embodiments of this application. Please refer to... Figure 15 The substrate 71 includes a mother plate 711, on which force transmission components 72 are directly mounted to form a battery protection structure 7. This method is compared to Figure 13 The illustrated embodiment omits the auxiliary plate 712, saving materials, costs, and installation steps, thus improving installation efficiency. This method is comparable to... Figure 14 The embodiment shown allows for the direct installation of the force transmission component 72 onto the entire large-size mother plate 711, saving the process of assembling the auxiliary plate 712 into one piece and improving installation efficiency.

[0134] The motherboard 711 can be the upper board in the battery, or it can be a separate board.

[0135] The number of force transmission components 72 can be set according to the arrangement of the battery cells 5 and in combination with the correspondence between the force transmission components 72 and the side wall 51. For example Figure 4As shown, two rows of battery cells 5 are arranged along the Y-axis, namely the first battery cell group and the second battery cell group. Force transmission components 72 correspond to a pair of sidewalls of the battery cells 5 parallel to the YOZ plane. The pair of sidewalls of the battery cells 5 in the first battery cell group parallel to the YOZ plane includes sidewall W1 and sidewall W2, and the pair of sidewalls of the battery cells 5 in the second battery cell group parallel to the YOZ plane includes sidewall W3 and sidewall W4. A total of three force transmission components 72 are provided: a first force transmission component 72a, a second force transmission component 72b, and a third force transmission component 72c. The first force transmission component 72a corresponds to sidewall W1 of the first battery cell group, the second force transmission component 72b corresponds to sidewalls W2 of the first battery cell group and W3 of the second battery cell group, and the third force transmission component 72c corresponds to sidewall W4 of the second battery cell group.

[0136] Of course, multiple battery cell groups can be set, and the number of corresponding force transmission components 72 can also be set according to the number of battery cell groups.

[0137] By providing force transmission components 72 on each of the pair of sidewalls of the battery cell 5 parallel to the YOZ plane, the force transmission components 72 can transmit the impact force of the bottom ball impact on essentially the entire bottom area of ​​the battery, and can transmit the impact force to each sidewall of the battery cell 5 parallel to the YOZ plane in a generally uniform manner, so that each sidewall parallel to the YOZ plane is subjected to uniform force, and the impact force will not be concentrated on a certain sidewall, causing deformation of that sidewall and causing a short circuit inside the battery.

[0138] It is understood that in some embodiments, the battery protection structure 7 may only include one or a combination of any of the first force transmission element 72, the second force transmission element 72, and the third force transmission element 72. For example, force transmission elements 72 can be placed near locations susceptible to impact from bottom balls, thus reducing the number of force transmission elements 72 and lowering costs. To ensure structural stability and uniform impact force transmission, symmetrical force transmission elements 72 can be used as much as possible.

[0139] like Figure 9 and Figure 10 As shown, eight rows of battery cells 5 are arranged along the first direction X. Force transmission members 72 correspond to a pair of sidewalls of the battery cell 5 parallel to the XOZ plane. A total of seven force transmission members 72 are provided. The two outer force transmission members 72 correspond to the outer sidewalls of the two outer battery cell groups respectively, and the second force transmission member 72 in the middle corresponds to the adjacent sidewalls of the two adjacent battery cell groups.

[0140] By providing force transmission components 72 on each of the pair of sidewalls of the battery cell 5 parallel to the XOZ plane, the force transmission components 72 can transmit the impact force of the bottom ball impact on essentially the entire bottom area of ​​the battery, and can transmit the impact force to each sidewall of the battery cell 5 parallel to the XOZ plane in a generally uniform manner, so that each sidewall parallel to the XOZ plane is subjected to uniform force, and the impact force will not be concentrated on a certain sidewall, causing deformation of that sidewall and causing a short circuit inside the battery.

[0141] It is understood that in some embodiments, the battery protection structure 7 may only include any one or any combination of the seven force transmission elements 72. For example, force transmission elements 72 can be placed near locations susceptible to impact from bottom ball strikes, thus reducing the number of force transmission elements 72 and lowering costs. To ensure structural stability and uniform impact force transmission, symmetrical force transmission elements 72 can be arranged as much as possible.

[0142] In some embodiments, the battery protection structure 7 is made of a resin-based composite material.

[0143] Resin-based composite materials consist of a matrix resin and reinforcing materials. The matrix resin of resin-based composite materials can be polypropylene (PP), polyamide 6 (PA6), polyamide 66 (PA66), polyphenylene sulfide (PPS), etc., while the reinforcing materials can be glass fiber, carbon fiber, etc.

[0144] By using resin-based composite materials as the material for the battery protection structure 7, the rigidity of the battery protection structure 7 can be improved, making the force transmission component 72 less prone to deformation and ensuring the force transmission effect.

[0145] In some embodiments, the thermal conductivity of the battery protection structure 7 is less than or equal to 0.5 W / m·°C.

[0146] The battery protection structure 7 can be made of a non-metallic material with a thermal conductivity of less than or equal to 0.5 W / m·°C. Because the thermal conductivity of the battery protection structure 7 is less than or equal to 0.5 W / m·°C, it possesses certain heat preservation properties. When a thermal management component is installed between the battery cell 5 and the battery protection structure 7, the thermal management efficiency of the component, such as cooling efficiency, can be guaranteed.

[0147] Figure 16 This is an exploded schematic diagram of a battery provided in some embodiments of this application. Figure 2 The difference between the embodiments shown is that, Figure 16The intermediate battery 2 also includes a thermal management component 8, which is disposed between the battery protection structure 7 and the multiple battery cells 5. The thermal management component 8 can be fixed to the battery cells 5 and the battery protection structure 7 by adhesive (using adhesive or backing adhesive) or welding. The welding method can be hot plate welding or laser welding.

[0148] By providing a thermal management component 8 between the battery protection structure 7 and the multiple battery cells 5, thermal management of the battery cells 5 can be performed, such as cooling the battery cells 5.

[0149] The thermal management component 8 can be a liquid cooling device (such as a water cooling plate), heat dissipation fins, etc.

[0150] Please see Figure 17 , Figure 17 This is a schematic flowchart illustrating a battery manufacturing method according to some embodiments of this application. The battery manufacturing method includes the following:

[0151] Step 171: Provide a substrate, the substrate including a first surface and a second surface;

[0152] Step 172: Provide multiple battery cells, each battery cell including multiple first sidewalls;

[0153] Step 173, provide the force transmission component;

[0154] Step 174: The force transmission member is disposed on the substrate, one end of the force transmission member is connected to the second surface, and the other end of the force transmission member extends away from the second surface.

[0155] Step 175: Arrange multiple battery cells on the first surface such that the first sidewall of the battery cell is perpendicular to the substrate, and in the arrangement direction of the first and second surfaces, the connection between the force transmission member and the second surface corresponds to at least a portion of the first sidewall.

[0156] The structure of the battery manufactured by the method of this embodiment can be referred to the foregoing. Figure 1-16 The battery-related details described in the corresponding embodiments will not be repeated here.

[0157] Please see Figure 18 , Figure 18 This is a schematic diagram of the structure of a battery manufacturing apparatus provided in some embodiments of this application. The battery manufacturing apparatus 10 includes: a first providing device 11, a second providing device 12, a third providing device 13, and an assembly device 14.

[0158] The first providing device 11 is configured to provide a substrate, the substrate including a first surface and a second surface;

[0159] The second providing device 12 is configured to provide a plurality of battery cells, each battery cell including a plurality of first sidewalls;

[0160] The third supplying device 13 is configured to supply a force transmission element;

[0161] Assembly device 14 is configured to place the force transmission member on the substrate, one end of the force transmission member being connected to the second surface, and the other end of the force transmission member extending in a direction away from the second surface;

[0162] The assembly device 14 is also configured to arrange a plurality of battery cells on the first surface such that the first sidewall of the battery cells is perpendicular to the substrate, and in the arrangement direction of the first and second surfaces, the connection between the force transmission member and the second surface corresponds to at least a portion of the first sidewall.

[0163] The relevant structure of the battery cell manufactured by the equipment in this embodiment can be referred to the foregoing. Figure 1-16 The battery-related details described in the corresponding embodiments will not be repeated here.

[0164] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery, characterized in that, include: Multiple battery cells (5) and a battery protection structure (7), the battery protection structure (7) comprising: The substrate (71) includes a first surface (S1) and a second surface (S2), the battery cell (5) is disposed on the first surface (S1), and the battery cell (5) includes a plurality of sidewalls (51), the plurality of sidewalls being configured to be disposed perpendicular to the substrate (71); A force transmission member (72) is disposed on the substrate (71). One end of the force transmission member (72) is connected to the second surface (S2), and the other end of the force transmission member (72) extends away from the second surface (S2). The force transmission member (72) has an inverted V-shaped structure. The force transmission member (72) includes a reinforcing part (723) and a first force transmission part (721) and a second force transmission part (722) respectively connected to the second surface (S2). The reinforcing part (723) is disposed between the first force transmission part (721) and the second force transmission part (722) and connects the first force transmission part (721) and the second force transmission part (722). In the arrangement direction of the first surface (S1) and the second surface (S2), the intersection of the first force transmission part (721) and the second force transmission part (722) with the second surface (S2) is configured to correspond to at least a portion of the sidewall.

2. The battery as described in claim 1, characterized in that, The connection point of the force transmission member (72) with the second surface (S2) is on the first surface (S1) in a first projection (P1), and covers at least part of the sidewall in a second projection (P2) on the first surface (S1).

3. The battery as described in claim 1, characterized in that, Along the first direction (X), the distance L, 0≤L≤10mm, is between the center of the first projection (P1) of the first surface (S1) and the connection point of the force transmission member (72) and the second surface (S2) and the outer edge of the second projection (P2) of the sidewall on the first surface (S1). The first direction (X) is parallel to the first surface (S1).

4. The battery as described in claim 1, characterized in that, The force transmission component (72) and the substrate (71) have a first included angle θ1 that satisfies: 30°≤θ1≤60°.

5. The battery as described in claim 1, characterized in that, Multiple force transmission components (72) are provided along the first direction (X). The distance (L1) between two adjacent force transmission components (72) is less than or equal to 1 / 3 of the size (L2) of the battery cell (5) along the first direction (X). The first direction (X) is parallel to the first surface (S1).

6. The battery as claimed in claim 1, characterized in that, The connection between the force transmission member (72) and the second surface (S2) is configured to correspond to the first sidewall (51a) with the smaller area among the plurality of sidewalls.

7. The battery as claimed in claim 1, characterized in that, The battery protection structure (7) is made of resin-based composite material.

8. The battery according to any one of claims 1 to 7, characterized in that, The thermal conductivity of the battery protection structure (7) is less than or equal to 0.5 W / m·°C.

9. The battery as claimed in claim 1, characterized in that, The battery (2) also includes a thermal management component (8), which is disposed between the battery protection structure (7) and the plurality of battery cells (5).

10. An electrical appliance, characterized in that, The electrical device includes a battery (2) as described in any one of claims 1 to 9, the battery (2) being used to provide electrical energy.

11. A method for manufacturing a battery, for manufacturing a battery (2) as described in any one of claims 1 to 9, characterized in that, include: A substrate is provided, the substrate including a first surface and a second surface; A plurality of battery cells are provided, each battery cell including a plurality of sidewalls; Provide force transmission components; The force transmission member is disposed on the substrate, one end of the force transmission member is connected to the second surface, and the other end of the force transmission member extends away from the second surface. Multiple battery cells are arranged on the first surface such that the sidewalls of the battery cells are perpendicular to the substrate, and in the arrangement direction of the first and second surfaces, the connection between the force transmission member and the second surface corresponds to at least a portion of the sidewalls.

12. A battery manufacturing apparatus for manufacturing a battery (2) as described in any one of claims 1 to 9, characterized in that, include: A first providing device (11) is configured to provide a substrate, the substrate including a first surface and a second surface; The second providing device (12) is configured to provide a plurality of battery cells, the battery cells including a plurality of sidewalls; The third supplying device (13) is configured to supply a force transmission element; Assembly device (14) is configured to place the force transmission member on the substrate, one end of the force transmission member being connected to the second surface and the other end of the force transmission member extending away from the second surface; The assembly apparatus (14) is further configured to arrange a plurality of the battery cells on the first surface such that the sidewalls of the battery cells are perpendicular to the substrate, and in the arrangement direction of the first surface and the second surface, the connection between the force transmission member and the second surface corresponds to at least a portion of the sidewalls.

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