Battery pack and electric device

Abstract

The application provides a battery pack and an electric device. The battery pack comprises a battery module, an end plate, a binding belt and a heater. The battery module comprises a plurality of battery cells stacked along a first direction, so that the battery module comprises two end faces arranged opposite along the first direction and two side faces arranged opposite along a second direction. A plurality of battery modules are stacked along the second direction. The binding belt is wound on the plurality of battery modules, so that the binding belt compresses the plurality of battery modules along the first direction and the second direction. The heater is attached to the side face of the battery module. The heater comprises two contact faces arranged opposite along the second direction. Only one heater is arranged between two adjacent battery modules, so that one of the contact faces is attached to the side face of one of the battery modules, and the other contact face is attached to the side face of the other battery module. Two end plates are arranged at the two ends of the plurality of battery modules along the first direction, so that the warping phenomenon of the end plates is eliminated, the binding effect of the binding belt is improved, and the production efficiency of the battery pack is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery pack and an electrical device. Background Technology

[0002] The battery pack includes multiple battery modules and heaters. The heaters are in contact with the battery modules and are used to heat the battery modules under low-temperature conditions, enabling the cells in the battery modules to charge and discharge within a suitable operating temperature range.

[0003] In related technologies, multiple battery modules in a battery pack are bonded and stacked together by heaters, forming a pre-assembly unit. When the pre-assembly unit is pressed into the box, the multiple battery modules are prone to deformation and misalignment, which affects the assembly speed and reduces production efficiency. Utility Model Content

[0004] This application provides a battery pack and power supply device to improve the assembly speed and production efficiency of the battery pack.

[0005] In a first aspect, this application provides a battery pack, comprising: a battery module, end plates, straps, and a heater. The battery module includes multiple battery cells stacked along a first direction, such that the battery module includes two end faces disposed opposite each other along the first direction and two side faces disposed opposite each other along a second direction. The first direction is perpendicular to the second direction. The multiple battery modules are stacked along the second direction. Two end plates are respectively disposed at both ends of the multiple battery modules along the first direction. The end plates are simultaneously connected to the end faces of the multiple battery modules. Straps are wrapped around the multiple battery modules, pressing the multiple battery modules together along the first and second directions. The heater is attached to the side faces of the battery modules. The heater includes contact surfaces disposed opposite each other along the two second directions. Only one heater is disposed between two adjacent battery modules, such that one contact surface is attached to the side face of one battery module, and the other contact surface is attached to the side face of the other battery module.

[0006] According to the description in the first aspect, the battery module consists of multiple battery cells stacked along a first direction, forming two end faces and two side faces. Multiple battery modules are stacked along a second direction, with end plates at both ends connecting the end faces of all battery modules. This effectively eliminates end plate warping, improves the constraint effect of the binding straps on the stacking direction of the battery modules, increases the assembly speed and stability of the battery modules, and thus improves the production efficiency of the battery pack.

[0007] In one possible design, the heater comprises a rigid heater. A thermally conductive structural adhesive is disposed between the contact surface and the side surface of the rigid heater.

[0008] Based on the description of the above embodiments, the contact surface of the rigid heater is bonded to the side of the battery module using thermally conductive structural adhesive. This prevents the heater from wrinkling and deforming due to shear stress, thereby improving the structural strength and service life of the battery module. Furthermore, it prevents the connection between battery modules from failing due to shear stress, ensuring the stability of the stacked connection between multiple battery modules and thus improving the production efficiency of the battery pack.

[0009] In one possible design, the heater also includes a flexible heater. The flexible heater includes a viscous contact surface and a non-viscous contact surface. The viscous contact surface is bonded to the side.

[0010] Based on the description of the above embodiments, the use of flexible heaters can solve the problem of excessive cost caused by using rigid heaters in the battery pack. By combining flexible heaters with rigid heaters, material costs can be reduced while avoiding shear resistance caused by double-sided bonding during module stacking, reducing the risk of heater delamination and improving production efficiency.

[0011] In one possible design, the heater includes two pins positioned opposite each other along a first direction. Mounting holes are provided on the end plate along the first direction. The pins pass through the mounting holes.

[0012] Based on the description of the above embodiments, the heater pins are inserted into the mounting holes of the end plate, enabling the heater to be electrically connected to the electrical system in the battery pack while also achieving pre-positioning of the heater, thereby further improving the assembly efficiency of the battery pack.

[0013] In one possible design, the diameter of the mounting hole in the second direction is a first distance. The thickness of the pin in the second direction is a second distance. The first distance is greater than the second distance.

[0014] Based on the description of the above embodiments, the first distance being greater than the second distance allows the pins to pass smoothly through the mounting holes and avoids contact stress between the pins and the mounting holes, thereby ensuring the structural stability of the pre-assembled unit and further improving the assembly efficiency of the battery pack.

[0015] In one possible design, the diameter of the mounting hole in the third direction is a third distance. The third direction, the first direction, and the second direction are all perpendicular to each other. The length of the pin in the third direction is a fourth distance. The third distance is greater than the fourth distance.

[0016] Based on the description of the above embodiments, the third distance being greater than the fourth distance allows the pins to pass smoothly through the mounting holes and avoids contact stress between the pins and the mounting holes, thereby ensuring the structural stability of the pre-assembled unit and further improving the assembly efficiency of the battery pack.

[0017] In one possible design, the first distance is greater than or equal to three times the second distance.

[0018] Based on the description of the above embodiments, the first distance is greater than or equal to three times the second distance, so that an assembly gap can still be formed between the pin and the mounting hole after overvoltage, thereby further improving the assembly efficiency of the battery pack.

[0019] In one possible design, the end plate has a mounting groove for engaging straps. The mounting groove is a blind groove formed along a first direction. The mounting groove includes two groove walls symmetrically arranged along a third direction.

[0020] Based on the description of the above embodiments, the strap can be pre-positioned by being snapped into the mounting groove, avoiding displacement of the strap's constraint force on the battery module, thereby ensuring the structural stability of the pre-assembled unit and further improving the assembly efficiency of the battery pack.

[0021] In one possible design, the mounting slot has a width of five distances in the third direction. The strap has a width of six distances in the third direction. The fifth distance is greater than the sixth distance.

[0022] Based on the description of the above embodiments, the fifth distance being greater than the sixth distance allows the strap to smoothly enter the mounting slot to achieve the pre-positioning of the strap, avoiding displacement of the strap's constraint force on the battery module, thereby ensuring the structural stability of the pre-assembled unit and further improving the assembly efficiency of the battery pack.

[0023] Secondly, this application provides an electrical device including a battery pack as described in any of the above embodiments, the battery pack being used to provide electrical energy.

[0024] The beneficial effects of the electrical device provided in the second aspect above can be found in the first aspect and the beneficial effects of the various possible embodiments of the first aspect, and will not be repeated here. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of a battery pack structure in one embodiment of this application.

[0027] Figure 2 for Figure 1 An exploded view of the battery module, end plate, and heater.

[0028] Figure 3 This is a schematic diagram of one structure of the end plate in an embodiment of this application.

[0029] Figure 4 This is a schematic diagram of a heater in one embodiment of this application.

[0030] Explanation of reference numerals in the attached figures:

[0031] 100-battery pack;

[0032] 1-Battery module; 2-End plate; 21-Lifting hole; 22-Cavity; 23-Mounting hole; 24-Mounting groove; 3-Binding strap; 4-Rigid heater; 5-Flexible heater;

[0033] 6 - Pin; 61 - Current input terminal; 62 - Current output terminal;

[0034] X - First direction; Y - Second direction; Z - Third direction. Detailed Implementation

[0035] 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.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0037] The terms "comprising" and "having," and any variations thereof, used in the specification, claims, and drawings of this application are intended to cover without excluding other meanings. The words "a" or "an" do not exclude the presence of multiples.

[0038] The term "embodiment" as used herein 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 the phrase "embodiment" in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0039] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0040] The directional terms appearing in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. For example, in the description of this application, terms such as "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 figures. They are used only for the convenience of describing this application and simplifying the description, and do not 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 this application.

[0041] Furthermore, the descriptions of directions such as the X direction, Y direction, and Z direction used to explain the operation and construction of the components in this embodiment are not absolute but relative. Although these directions are appropriate when the components are in the positions shown in the figure, they should be interpreted differently when these positions change to correspond to the changes.

[0042] Furthermore, the terms "first," "second," etc., in the specification and claims of this application or in the aforementioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0043] In the description of this application, unless otherwise stated, "multiple" means two or more (including two), and similarly, "multiple groups" means two or more (including two groups).

[0044] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, "connection" or "linkage" in mechanical structures can refer to a physical connection, such as a fixed connection, for example, a connection fixed by fasteners, such as a connection fixed by screws, bolts, or other fasteners; a physical connection can also be a detachable connection, such as a snap-fit ​​or interlocking connection; a physical connection can also be an integral connection, such as a connection formed by welding, bonding, or integral molding. In circuit structures, "connection" or "linkage" can refer not only to a physical connection but also to an electrical connection or a signal connection. For example, it can be a direct connection, i.e., a physical connection, or an indirect connection through at least one intermediate component, as long as the circuit is connected; it can also refer to the internal connection of two components. Signal connection can refer not only to signal connection through a circuit but also to signal connection through a media, such as radio waves. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0045] The battery pack includes multiple battery modules and heaters. The heaters are in contact with the battery modules and are used to heat the battery modules under low-temperature conditions, enabling the cells in the battery modules to charge and discharge within a suitable operating temperature range.

[0046] In related technologies, multiple battery modules in a battery pack are bonded and stacked together by heaters, forming a pre-assembly unit. When the pre-assembly unit is pressed into the box, the multiple battery modules are prone to deformation and misalignment, which affects the assembly speed and reduces production efficiency.

[0047] Based on this, this application provides a battery pack and power supply device. By improving the end plate and heater in the battery pack, the pre-assembled unit can stably connect multiple battery modules during overpressure insertion into the box, avoiding deformation and misalignment, thereby improving assembly speed and production efficiency. The following is in conjunction with... Figure 1-4 Please provide a detailed explanation.

[0048] In a first aspect, this application provides a battery pack 100, comprising: a battery module 1, end plates 2, straps 3, and heaters. The battery module 1 includes multiple battery cells stacked along a first direction X, such that the battery module 1 includes two end faces disposed opposite each other along the first direction X and two side faces disposed opposite each other along a second direction Y. The first direction X is perpendicular to the second direction Y. The multiple battery modules 1 are stacked along the second direction Y. Two end plates 2 are respectively disposed at both ends of the multiple battery modules 1 along the first direction X. The end plates 2 are simultaneously connected to the end faces of the multiple battery modules 1. The straps 3 are wrapped around the multiple battery modules 1, thereby pressing the multiple battery modules 1 together along the first direction X and the second direction Y. The heaters are attached to the side faces of the battery modules 1. The heaters include contact surfaces disposed opposite each other along the two second directions Y. Only one heater is disposed between two adjacent battery modules 1, such that one contact surface is attached to the side face of one battery module 1, and the other contact surface is attached to the side face of the other battery module 1.

[0049] Here, battery module 1 refers to a basic energy storage unit formed by stacking multiple battery cells along a specific direction. Specifically, such as... Figure 1 As shown, the battery cells are stacked along the first direction X to form a battery module 1.

[0050] The end plate 2 is a support structure located at both ends of the battery module 1 along the cell stacking direction. It can be made of die-cast aluminum alloy or stamped steel plate and is used to connect multiple battery modules 1 and to fix multiple battery modules 1 in the housing of the battery pack 100. Specifically, as shown... Figure 2 As shown, two end plates 2 are disposed at both ends of multiple battery modules 1 along the first direction X, and the end plates 2 are provided with connection holes for connecting bolts and lifting holes 21 for hoisting, so that the operator can fix the end plates 2 to the battery modules 1 through the connection holes and place multiple battery modules 1 in the box through the lifting holes 21.

[0051] Among them, the binding strap 3 refers to the constraint strap set around the battery module 1, which forms a multi-dimensional constraint on the battery module 1 through bidirectional winding. Specifically, as shown... Figure 1 As shown, the strap 3 is wrapped around the multiple battery modules 1 along the first direction X and the second direction Y, and the strap 3 presses the battery modules 1 so that the strap 3 constrains the multiple battery modules 1 in the first direction X and the second direction Y.

[0052] The heater refers to the temperature control element that contacts the side of the battery module 1. It can be implemented using silicone heating pads, epoxy resin heating pads, or metal heating pads, etc. The heater in this application can reduce the number of heaters installed by using a double-sided contact surface design, so that only one heater is needed between two adjacent battery modules 1, thereby reducing the production cost of the battery pack 100. Specifically, the contact surface refers to the area where the heater contacts the side of the battery module 1. It can be implemented using a planar or slightly convex curved surface structure to transfer heat and allow relative displacement of the battery modules 1. In addition, since the double-sided contact surface of the heater is in contact with the side of two adjacent battery modules 1 respectively, the heater can also play a pre-fixing role between two battery modules 1, so that the sides of multiple battery modules 1 can be stacked along the second direction Y to form a pre-assembled unit for overall packaging.

[0053] In the prior art, each battery module 1 in the battery pack 100 has an independent end plate 2 at both ends, resulting in multiple stress points in multiple battery modules 1. When multiple battery modules 1 and heaters arranged between the battery modules 1 are assembled into a pre-assembly unit, the clamping force applied to the battery modules 1 by the straps 3 wrapped around them is concentrated on the end plate 2 of the battery modules 1 at the edge of the battery pack 100. This makes the end plate 2 of the battery modules 1 at the edge of the battery pack 100 the stress side, while the end plate 2 of the battery modules 1 at the middle of the battery pack 100 is the non-stress side. The end plate 2 on the non-stress side warps due to the lack of constraint, which affects the installation of bolts on the end plate 2, and thus affects the assembly speed and stability of the pre-assembly unit.

[0054] To address the aforementioned issues, this embodiment reduces the number of end plates 2, eliminating redundant stress points.

[0055] Specifically, such as Figure 2 As shown, after multiple battery modules 1 are stacked along the second direction Y, an end plate 2 is set at each end. The end plates 2 at both ends of the battery module 1 located in the middle of the battery pack 100 are eliminated, which reduces the stress points of the end plates 2 and avoids warping of the end plates 2. This allows the bolts on the end plates 2 to be installed smoothly, thereby ensuring the assembly speed and assembly stability of the battery module 1.

[0056] In summary, the battery module 1 is composed of multiple battery cells stacked along the first direction X, forming two end faces and two side faces. Multiple battery modules 1 are stacked along the second direction Y, with end plates 2 connecting all the end faces of the battery modules 1. This effectively eliminates warping of the end plates 2, improves the constraint effect of the binding straps 3 on the stacking direction of the battery modules 1, and increases the assembly speed and stability of the battery modules 1, thereby improving the production efficiency of the battery pack 100.

[0057] Furthermore, such as Figure 3As shown, in some embodiments, the end plate 2 is a plate-like structure with multiple cavities 22.

[0058] By creating multiple cavities 22 in the end plate 2, the weight of the end plate 2 can be reduced, and the amount of material used in its manufacture can be reduced, thereby lowering the production cost of the battery pack 100.

[0059] In some embodiments, the heater includes a rigid heater 4. A thermally conductive structural adhesive is disposed between the contact surface and the side surface of the rigid heater 4.

[0060] The rigid heater 4 refers to a sheet-like heating element with high rigidity, which may include, but is not limited to, silicone heating sheets, epoxy resin heating sheets, or metal heating sheets. Its mechanical strength can resist deformation during overpressure. Specifically, the thinner the rigid heater 4, the better the heating effect. For example, the thickness of the flexible heater 5 can range from 0.6 to 6 mm, and this application does not specifically limit it.

[0061] Overpressure refers to pressing multiple battery modules 1 along the first direction X and the second direction Y when the pre-assembled unit is placed into the box, so that the pre-assembled unit can be smoothly placed into the box.

[0062] Among them, thermally conductive structural adhesive refers to an adhesive that has thermal conductivity and adhesion. Compared with double-sided tape, thermally conductive structural adhesive has a solidification process. Before the thermally conductive structural adhesive solidifies, the contact surface is allowed to be displaced in the shear direction, that is, the two adjacent battery modules 1 are allowed to be displaced relative to each other in the first direction X.

[0063] Specifically, the rigid heater 4 maintains a flat shape during overpressure due to its rigid structure, preventing wrinkles caused by pressure. Before solidification, the thermally conductive adhesive forms a flowable adhesive layer between the rigid heater 4 and the side of the battery module 1, allowing adjacent battery modules 1 to move slightly along the first direction X during stacking. This significantly reduces the shear stress of multiple battery modules 1 during overpressure, preventing wrinkles and deformation of the heater due to shear stress, improving the structural strength and lifespan of the battery module 1, and reducing maintenance costs. Furthermore, the slight movement of the battery modules 1 along the first direction X during stacking prevents connection failure due to shear stress, ensuring the stability of the stacked connection between multiple battery modules 1. This improves the efficiency of pre-assembled unit loading, thus increasing the production efficiency of the battery pack 100.

[0064] As described in the above embodiments, the contact surface of the rigid heater 4 is bonded to the side of the battery module 1 with thermally conductive structural adhesive, which can prevent the heater from wrinkling and deforming due to shear stress, thereby improving the structural strength and service life of the battery module 1. Furthermore, it can prevent the connection between battery modules 1 from failing due to shear stress, ensuring the stability of the stacked connection between multiple battery modules 1, thereby improving the production efficiency of the battery pack 100.

[0065] In some embodiments, the heater further includes a flexible heater 5. The flexible heater 5 includes an adhesive contact surface and a non-adhesive contact surface. The adhesive contact surface is bonded to the side surface.

[0066] The flexible heater 5 refers to a heating element that can be bent and deformed to adapt to the side shape of the battery module 1, and can be made of PET film or PI film materials, etc. Specifically, the thinner the flexible heater 5, the better the heating effect. For example, the thickness of the flexible heater 5 can be 0.2-0.8mm, and this application does not make a specific limitation in this regard.

[0067] Among them, the flexible heater 5 has the advantage of low cost compared to the rigid heater 4. Therefore, it is possible to replace the rigid heater 4 with the flexible heater 5 in the battery pack 100 where there is no need to bear shear stress, so as to reduce the production cost of the battery pack 100.

[0068] Specifically, such as Figure 1 and Figure 2 As shown, the flexible heater 5 can be arranged on the side of the battery module 1 at the edge of the battery pack 100, so that its adhesive contact surface is directly bonded and fixed to the side of the battery module 1, and its non-adhesive contact surface faces the outside of the battery pack 100, without needing to be bonded to other battery modules 1, thereby avoiding the flexible heater 5 from wrinkling and deforming due to the shear stress between the battery modules 1 during the overpressure process.

[0069] Specifically, the contact surfaces can be coated with adhesives such as double-sided tape or pressure-sensitive adhesive to make the contact surfaces sticky.

[0070] According to the description of the above embodiments, the use of flexible heater 5 can solve the problem of excessive cost caused by using rigid heater 4 in all battery packs 100. By combining flexible heater 5 and rigid heater 4, material costs can be reduced while avoiding shear resistance caused by double-sided bonding during module stacking, reducing the risk of heater delamination and improving production efficiency.

[0071] In some embodiments, the heater includes two pins 6 disposed opposite each other along a first direction X. A mounting hole 23 is provided on the end plate 2 along the first direction X. The pins 6 pass through the mounting hole 23.

[0072] Among them, such as Figure 4 As shown, taking the rigid heater 4 as an example, the two pins 6 arranged opposite each other along the first direction X refer to the connection structures extending from both sides of the heater in the first direction X, used to realize the electrical connection of the heater. Specifically, the pins 6 of the heater can be connected to the current input terminal 61 and the current output terminal 62, so that the heater can be connected in parallel with the high-voltage main circuit of the battery pack 100. In some embodiments, multiple heaters can be connected in parallel with the high-voltage main circuit respectively, so that the control system of the battery pack 100 can control multiple heaters to heat separately. In other embodiments, multiple heaters can be connected in series first, and then connected in parallel with the high-voltage main circuit, so that the control system of the battery pack 100 can control multiple heaters to heat simultaneously.

[0073] Among them, such as Figure 3 As shown, mounting hole 23 refers to the through structure on end plate 2 used to accommodate pin 6. Specifically, it can be achieved by drilling or stamping, so that pin 6 can pass through end plate 2 to achieve electrical connection of heater.

[0074] Furthermore, after pin 6 is inserted into the mounting hole 23 of the end plate 2, the hole wall of the mounting hole 23 can restrict the displacement of pin 6, realize the pre-positioning of the heater, thereby avoiding misalignment of the heater due to assembly errors when multiple battery modules 1 are stacked, and further improving the assembly efficiency of the battery pack 100.

[0075] According to the description of the above embodiment, the heater pin 6 is inserted into the mounting hole 23 of the end plate 2, which enables the heater to be electrically connected to the electrical system in the battery pack 100, and also enables the heater to be pre-positioned, thereby further improving the assembly efficiency of the battery pack 100.

[0076] In some embodiments, the diameter of the mounting hole 23 in the second direction Y is a first distance. The thickness of the pin 6 in the second direction Y is a second distance. The first distance is greater than the second distance.

[0077] Specifically, by limiting the diameter of the mounting hole 23 in the second direction Y, displacement space is provided for the pin 6 in the second direction Y.

[0078] The first distance refers to the distance between the inner walls of the mounting hole 23 along the second direction Y, ensuring that this dimension is greater than the actual structural length of the pin 6 in the second direction Y, thereby forming an assembly gap.

[0079] The second distance refers to the actual structural length of pin 6 along the second direction Y. By controlling the difference between this length and the first distance, rigid contact between pin 6 and the hole wall is avoided.

[0080] Specifically, when the first distance is greater than the second distance, the pin 6 can pass smoothly through the mounting hole 23 to achieve electrical connection of the heater. Furthermore, the first distance being greater than the second distance creates an assembly gap between the pin 6 and the mounting hole 23, which can avoid contact stress between the pin 6 and the mounting hole 23, thereby ensuring the structural stability of the pre-assembled unit and further improving the assembly efficiency of the battery pack 100.

[0081] According to the description of the above embodiments, the first distance being greater than the second distance allows the pin 6 to pass smoothly through the mounting hole 23 and avoids contact stress between the pin 6 and the mounting hole 23, thereby ensuring the structural stability of the pre-assembled unit and further improving the assembly efficiency of the battery pack 100.

[0082] In some embodiments, the diameter of the mounting hole 23 in the third direction Z is a third distance. The third direction Z, the first direction X, and the second direction Y are all perpendicular to each other. The length of the pin 6 in the third direction Z is a fourth distance. The third distance is greater than the fourth distance.

[0083] Here, the third direction Z refers to the spatial dimension that is perpendicular to both the first direction X and the second direction Y. Specifically, it can be expressed as... Figure 1 , Figure 2 and Figure 3 The coordinate system is represented in the diagram. By defining the diameter of the mounting hole 23 in the third direction Z, displacement space is provided for the pin 6 in the third direction Z.

[0084] The third distance refers to the distance between the inner walls of the mounting hole 23 along the third direction Z, ensuring that this dimension is greater than the actual structural length of the pin 6 in the third direction Z, thereby forming an assembly gap.

[0085] The fourth distance refers to the actual structural length of pin 6 along the third direction Z. By controlling the difference between this length and the third distance, rigid contact between pin 6 and the hole wall is avoided.

[0086] Specifically, when the third distance is greater than the fourth distance, the pin 6 can pass smoothly through the mounting hole 23 to achieve electrical connection of the heater. Furthermore, the third distance being greater than the fourth distance creates an assembly gap between the pin 6 and the mounting hole 23, which can avoid contact stress between the pin 6 and the mounting hole 23, thereby ensuring the structural stability of the pre-assembled unit and further improving the assembly efficiency of the battery pack 100.

[0087] According to the description of the above embodiment, the third distance being greater than the fourth distance allows the pin 6 to pass smoothly through the mounting hole 23 and avoids contact stress between the pin 6 and the mounting hole 23, thereby ensuring the structural stability of the pre-assembled unit and further improving the assembly efficiency of the battery pack 100.

[0088] Furthermore, in some embodiments, the first distance is greater than or equal to three times the second distance.

[0089] As can be seen from the foregoing, the pre-assembly unit consisting of battery module 1 and heater needs to withstand overpressure. The overpressure is applied to the end plate 2 of battery module 1 along the second direction Y, causing the mounting holes 23 on the end plate 2 to deform along the second direction Y.

[0090] Based on this, the first distance is made to be greater than or equal to three times the second distance, so as to leave room for the deformation of the mounting hole 23 along the second direction Y, so that an assembly gap can still be formed between the pin 6 and the mounting hole 23 after overpressure, avoiding contact stress between the pin 6 and the mounting hole 23, thereby ensuring the structural stability of the pre-assembled unit and further improving the assembly efficiency of the battery pack 100.

[0091] According to the description of the above embodiments, the first distance is greater than or equal to three times the second distance, so that an assembly gap can still be formed between the pin 6 and the mounting hole 23 after overvoltage, thereby further improving the assembly efficiency of the battery pack 100.

[0092] In some embodiments, such as Figure 3 As shown, the end plate 2 has a mounting groove 24 for engaging the strap 3. The mounting groove 24 is a blind groove formed along the first direction X. The mounting groove 24 includes two groove walls symmetrically arranged along the third direction Z.

[0093] The mounting groove 24 refers to the groove structure set on the surface of the end plate 2 for fixing the strap 3. It can be realized by machining or molding process. The shape of the groove matches the cross section of the strap 3 to achieve physical limitation of the strap 3.

[0094] Among them, the blind groove refers to a groove structure that extends along the first direction X and is closed at the end. Specifically, it can be achieved by forming a non-penetrating groove inside the end plate 2. The closed end can prevent the strap 3 from slipping off along the bottom of the groove.

[0095] Specifically, after the strap 3 is embedded in the mounting groove 24, its path of displacement along the third direction Z is constrained by the groove wall, and its path of displacement along the first direction X is constrained by the groove bottom. This achieves the pre-positioning of the strap 3, avoids displacement of the constraint force of the strap 3 on the battery module 1, thereby ensuring the structural stability of the pre-assembled unit and further improving the assembly efficiency of the battery pack 100.

[0096] According to the description of the above embodiments, the strap 3 can be pre-positioned by being snapped into the mounting groove 24, avoiding displacement of the binding force of the strap 3 on the battery module 1, thereby ensuring the structural stability of the pre-assembled unit and further improving the assembly efficiency of the battery pack 100.

[0097] In some embodiments, the width of the mounting slot 24 in the third direction Z is a fifth distance. The bandwidth of the strap 3 in the third direction Z is a sixth distance. The fifth distance is greater than the sixth distance.

[0098] The fifth distance refers to the distance between the groove walls of the mounting groove 24 along the third direction Z, and the sixth distance refers to the actual structural length of the strap 3 in the third direction Z.

[0099] By controlling the fifth length to be greater than the sixth length, an assembly gap is formed between the mounting groove 24 and the strap 3, allowing the strap 3 to smoothly enter the mounting groove 24 to achieve the pre-positioning of the strap 3.

[0100] According to the description of the above embodiments, the fifth distance is greater than the sixth distance, which allows the strap 3 to smoothly enter the mounting groove 24 to achieve the pre-positioning of the strap 3, avoids displacement of the constraint force of the strap 3 on the battery module 1, thereby ensuring the structural stability of the pre-assembled unit and further improving the assembly efficiency of the battery pack 100.

[0101] Secondly, this application provides an electrical device including a battery pack as described in any of the above embodiments, the battery pack being used to provide electrical energy.

[0102] Those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this application and form different embodiments. For example, in the claims, any of the claimed embodiments can be used in any combination.

[0103] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended 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 of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A battery pack, characterized by, include: Battery module, end plate, straps and heater; The battery module includes a plurality of cells stacked along a first direction, such that the battery module includes two end faces disposed opposite to each other along the first direction and two side faces disposed opposite to each other along a second direction; Wherein, the first direction is perpendicular to the second direction; Multiple battery modules are stacked along the second direction; The two end plates are respectively disposed at both ends of the plurality of battery modules along the first direction; The end plate is simultaneously connected to the end faces of multiple battery modules; The straps are wrapped around the plurality of battery modules, thereby pressing the plurality of battery modules together along the first direction and the second direction; The heater is attached to the side of the battery module; The heater includes two contact surfaces disposed opposite each other along the second direction; Only one heater is provided between two adjacent battery modules, such that one of the contact surfaces is attached to the side of one of the battery modules, and the other contact surface is attached to the side of the other battery module.

2. The battery pack of claim 1, wherein, The heater includes a rigid heater; A thermally conductive structural adhesive is provided between the contact surface of the rigid heater and the side surface.

3. The battery pack of claim 2, wherein, The heater also includes a flexible heater; The flexible heater includes a viscous contact surface and a non-viscous contact surface; The adhesive contact surface is bonded to the side surface.

4. The battery pack of any one of claims 1-3, wherein, The heater includes two pins arranged opposite to each other along the first direction; The end plate is provided with mounting holes along the first direction; The pin passes through the mounting hole.

5. The battery pack of claim 4, wherein, The diameter of the mounting hole in the second direction is the first distance; The thickness of the pin in the second direction is the second distance; The first distance is greater than the second distance.

6. The battery pack of claim 5, wherein, The diameter of the mounting hole in the third direction is the third distance; Wherein, the third direction, the first direction, and the second direction are perpendicular to each other; The length of the pin in the third direction is the fourth distance; The third distance is greater than the fourth distance.

7. The battery pack of claim 6, wherein, The first distance is greater than or equal to three times the second distance.

8. The battery pack of claim 7, wherein, The end plate is provided with a mounting groove for engaging the strap. The mounting slot is a blind slot opened along the first direction; The mounting groove includes two groove walls symmetrically arranged along the third direction.

9. The battery pack of claim 8, wherein, The width of the mounting groove in the third direction is the fifth distance; The bandwidth of the strap in the direction of the third party is the sixth distance; The fifth distance is greater than the sixth distance.

10. An electrical device, characterized by The battery pack includes any one of claims 1-9, the battery pack being used to provide electrical energy.

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