Battery pack and electric device

Abstract

The application relates to the battery technical field and provides a battery pack and a power utilization equipment. The battery pack comprises a box body and a battery pack, the frame and the bottom plate of the box body jointly define a containing cavity, and the battery pack is arranged on the bottom plate. The battery pack comprises a plurality of batteries, the bottom wall of the battery shell is parallel to the bottom plate, and a first glue layer is arranged between the side walls of adjacent batteries; the battery pack comprises first battery units and second battery units arranged along a first direction, a first partition plate is arranged between the first battery units and the second battery units, and at least one end of the first partition plate along a second direction exceeds at least one battery unit. A first baffle plate is arranged on at least one end of the battery pack along the second direction, the first baffle plate is fixedly connected with the first partition plate, and the first baffle plate, the first partition plate and the bottom plate jointly define a containing groove, and the first glue layer is at least partially located in the containing groove. The application can limit the overflow of glue material to the outside of the battery pack, promote the uniform dispersion of the glue material, reduce the glue material consumption, and reduce the weight and manufacturing cost of the battery pack.

Description

Technical Field

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

[0002] Currently, most batteries in existing battery packs are fixed to the base plate of the casing using structural adhesive. This increases the risk of batteries detaching from the base plate during battery pack vibrations. To improve the structural strength of the battery pack, an adhesive layer can be applied between the sidewalls of adjacent batteries to enhance the bonding effect between them.

[0003] However, during actual assembly, the adhesive layer is prone to overflowing to the outside of the battery pack, resulting in an increase in the amount of adhesive used in the battery pack or poor uniformity of the adhesive layer, which affects the structural strength of the battery pack and makes the battery pack heavier, which is not conducive to the lightweight production of the battery pack. Summary of the Invention

[0004] This application aims to at least solve one of the technical problems existing in the related art. To this end, one aspect of this application proposes a battery pack for partitioning and restricting the potting area within the battery pack, thereby reducing the overflow of the first adhesive layer into unnecessary areas and the resulting amount of adhesive material used, while ensuring the structural strength of the battery pack, thus reducing the weight and manufacturing cost of the battery pack.

[0005] The battery pack according to an embodiment of this application includes a housing and a battery pack; The housing includes a frame and a bottom plate. The frame and the bottom plate are fixedly connected and together define a receiving cavity. The battery pack is at least partially disposed in the receiving cavity and disposed on the bottom plate. The battery pack includes multiple batteries. Each battery includes a housing and a cell disposed within the housing. The housing includes a bottom wall and a side wall connected to the bottom wall. The side wall is perpendicular to the bottom wall and is arranged parallel to the base plate. A first adhesive layer is provided between the side walls of at least two adjacent batteries. The battery pack includes a first battery unit and a second battery unit arranged along a first direction. Both the first battery unit and the second battery unit include a plurality of batteries. A first partition plate is provided between the first battery unit and the second battery unit. The first direction and the second direction are both parallel to the base plate and perpendicular to each other. At least one end of the first partition plate along the second direction extends beyond the first battery unit and / or the second battery unit. It also includes a first baffle, which is disposed on the outside of at least one end of the battery pack along the second direction. The first baffle is fixedly connected to the first partition plate. The first baffle, the first partition plate and the bottom plate together define a receiving groove, and the first adhesive layer is at least partially located in the receiving groove.

[0006] Another aspect of this application proposes an electrical appliance.

[0007] The electrical equipment according to the embodiments of this application includes: Battery packs as described in any of the preceding items.

[0008] The above technical solution has the following advantages or beneficial effects: The battery pack provided in this application, by providing a first baffle on the outer side of at least one end of the battery pack along the second direction, can prevent the first adhesive layer from overflowing to the outside of the battery pack. By providing a first partition plate between the first battery cell and the second battery cell, the battery pack can be divided into multiple battery cells, shortening the flow path of the first adhesive layer in each battery cell, which is beneficial for the first adhesive layer to be quickly and evenly dispersed between the sidewalls of adjacent batteries. At the same time, the first baffle and the first partition plate are fixedly connected and together with the base plate define a receiving groove, which can restrict the flow range of the first adhesive layer from at least three directions, so that the first adhesive layer is at least partially kept in the receiving groove. Thus, while using the first adhesive layer to bond adjacent batteries and ensuring the overall structural strength of the battery pack, the uniformity of the distribution of the first adhesive layer can be improved, the overflow of the first adhesive layer into unnecessary areas and the amount of adhesive layer used as a result can be reduced, thereby reducing the weight of the battery pack, increasing the mass energy density, and saving materials and manufacturing costs.

[0009] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application and are not considered as limitations on this application. Moreover, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is an isometric schematic diagram of a battery pack provided in one embodiment of this application.

[0012] Figure 2 yes Figure 1 A magnified view of part A in the diagram.

[0013] Figure 3 yes Figure 1 A magnified view of part B in the diagram.

[0014] Figure 4 This is a top view of a battery pack provided in one embodiment of this application.

[0015] Figure 5 yes Figure 4 A magnified view of part C in the diagram.

[0016] Figure 6 This is a schematic diagram of the installation of the limiting protrusion in the battery pack provided in one of the embodiments of this application.

[0017] Figure 7 This is a schematic diagram of battery installation for a battery pack provided in one embodiment of this application.

[0018] Figure 8 This is one of the schematic diagrams of a battery pack provided in Embodiment 2 of this application when the battery is a cylindrical battery.

[0019] Figure 9 This is the second schematic diagram of a battery pack provided in the second embodiment of this application, where the battery is a cylindrical battery.

[0020] Figure 10 This is a schematic diagram of the installation of the first separator and the cylindrical battery in the battery pack provided in Embodiment 2 of this application.

[0021] Figure 11 This is a schematic diagram of the electrical equipment provided in the embodiments of this application.

[0022] Figure 12 This is a schematic diagram of a battery pack provided in another embodiment of this application.

[0023] Figure 13 This is an exploded view of the battery pack in this application embodiment when the battery is a prismatic battery.

[0024] Figure label: 100. Battery pack; 110. Housing; 111. Frame; 112. Base plate; 113. Receiving cavity; 114. Cover plate; 120. Battery pack; 121. Battery; 1211. Housing; 12111. Bottom wall; 12112. Side wall; 12113. Top wall; 12114. First side wall; 12115. Second side wall; 1212. Battery cell; 1213. Cover plate assembly; 122. First battery unit; 123. Second battery unit; 130. First adhesive layer; 140. First partition plate; 141. First plate surface; 142. Limiting protrusion; 150. First baffle; 151. Second plate surface; 160. Receiving groove; 170. Second baffle; 180. Flexible seal; 190. Second adhesive layer; 200. Electrical equipment; 210. Controller. Detailed Implementation

[0025] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0026] The specific terms used in this specification are for illustrative purposes only and are not intended to limit the illustrated embodiments. For example, expressions such as "same" and "identical" not only indicate a strictly identical state, but also indicate a state with tolerances or differences in the degree of functionality. For example, expressions indicating relative or absolute arrangement such as "in a certain direction," "along a certain direction," "side by side," "perpendicular," "centered on," "concentric," or "coaxial" not only strictly indicate such an arrangement, but also indicate a state of relative displacement by tolerances or angles or distances with the same degree of functionality.

[0027] The 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 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.

[0028] Furthermore, features specified as "first" or "second" may explicitly or implicitly include one or more of those features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly specified. In the description of the embodiments of this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, B1 and / or B2 can represent: B1 existing alone, B1 and B2 existing simultaneously, and B2 existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0029] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0030] The following is combined with Figures 1 to 13 This application describes the battery pack and electrical equipment provided.

[0031] It should be noted that, in the embodiments of this application, the first direction, the second direction, and the third direction can all be referred to. Figure 1 The arrows in the diagram indicate the directions. The first and second directions are both parallel to the base plate 112 of the housing 110 and perpendicular to each other, while the third direction is perpendicular to the base plate 112. As an example, the first direction can be understood as the width direction of the battery pack 100, the second direction as the length direction of the battery pack 100, and the third direction as the height direction of the battery pack 100. The above directional limitations are only used to describe the relative positional relationships between the components in the battery pack 100 to facilitate the explanation of the technical solution of this application, and do not constitute a limitation on the actual installation direction or usage posture of the battery pack 100.

[0032] See Figures 1 to 7 As shown, the battery pack 100 provided in this embodiment includes a housing 110 and a battery pack 120. The housing 110 includes a frame 111 and a bottom plate 112. The frame 111 and the bottom plate 112 are fixedly connected and together define a receiving cavity 113. The battery pack 120 is at least partially disposed in the receiving cavity 113 and disposed on the bottom plate 112. The battery pack 120 includes a plurality of batteries 121. Each battery 121 includes a housing 1211 and a cell 1212 disposed within the housing 1211. The housing 1211 includes a bottom wall 12111 and a side wall 12112 connected to the bottom wall 12111. The side wall 12112 is perpendicular to the bottom wall 12111. The bottom wall 12111 is parallel to the bottom plate 112. A first adhesive layer 130 is provided between the side walls 12112 of at least two adjacent batteries 121.

[0033] The battery pack 120 includes a first battery unit 122 and a second battery unit 123 arranged along a first direction. Both the first battery unit 122 and the second battery unit 123 include a plurality of batteries 121. A first partition plate 140 is provided between the first battery unit 122 and the second battery unit 123. At least one end of the first partition plate 140 along a second direction extends beyond the first battery unit 122 and / or the second battery unit 123. The battery pack 100 also includes a first baffle 150, which is disposed outside at least one end of the battery pack 120 along the second direction. The first baffle 150 is fixedly connected to the first partition plate 140. The first baffle 150, the first partition plate 140, and the bottom plate 112 together define a receiving groove 160. The first adhesive layer 130 is at least partially located within the receiving groove 160.

[0034] The battery pack 100 provided in this application, by providing a first baffle 150 on the outer side of at least one end of the battery pack 120 along the second direction, can block the first adhesive layer 130 from overflowing to the outside of the battery pack 120; by providing a first partition plate 140 between the first battery unit 122 and the second battery unit 123, the battery pack 120 can be divided into multiple battery units, shortening the flow path of the first adhesive layer 130 in each battery unit, which is conducive to the rapid and uniform dispersion of the first adhesive layer 130 between the sidewalls 12112 of adjacent batteries 121; at the same time, the first baffle 150 is fixedly connected to the first partition plate 140 and together with the bottom plate 112 defines the receiving groove 160, which can restrict the flow range of the first adhesive layer 130 from multiple directions, so that the first adhesive layer 130 is at least partially kept in the receiving groove 160. Therefore, while using the first adhesive layer 130 to bond adjacent batteries 121 and ensure the overall structural strength of the battery pack 120, it can improve the uniformity of the distribution of the first adhesive layer 130, reduce the overflow of the first adhesive layer 130 into unnecessary areas and the amount of adhesive layer used, thereby reducing the weight of the battery pack 100, increasing the mass energy density, and saving materials and manufacturing costs.

[0035] Specifically, when the adhesive material forming the first adhesive layer 130 is poured into the battery pack 120, the adhesive material can enter between the sidewalls 12112 of adjacent batteries 121 in the same battery cell and flow and spread along the gap between adjacent batteries 121. The first partition plate 140 can form a separation boundary between adjacent battery cells, reducing the possibility of adhesive material flowing laterally from one battery cell to another; the first baffle 150 can form a separation boundary at the end of the battery pack 120 along the second direction, reducing the possibility of adhesive material flowing outward from the end of the battery pack 120; the bottom plate 112 can form the bottom boundary of the receiving groove 160. The first baffle 150, the first partition plate 140 and the bottom plate 112 thereby restrict the adhesive material from at least three directions, so that the adhesive material is mainly distributed in the area within the corresponding battery cell where the first adhesive layer 130 needs to be formed.

[0036] The structure and function of each component in the battery pack 100 provided in this application are described in detail below.

[0037] The enclosure 110 provides a mounting base and protective space for the battery pack 120 and other components within the battery pack 100. The enclosure 110 can be a closed or semi-closed structure made of metal, plastic, or composite materials. It serves as the physical carrier of the battery pack 120, housing, supporting, and securing the battery pack 120, battery management system, thermal management system, and electrical connection components. The enclosure 110 ensures that these components maintain a relatively stable position during battery pack 100 operation, reducing the possibility of component damage or loosening caused by vibration, impact, or other factors. It also provides dustproof, waterproof, and mechanical protection for the components within the enclosure 110.

[0038] In some embodiments of this application, the housing 110 includes a frame 111, a bottom plate 112, and a cover plate 114. The frame 111 and the bottom plate 112 are fixedly connected and together form a receiving cavity 113 with at least one side open. The battery pack 120 can be installed into the housing 110 through the open side of the receiving cavity 113. After the battery pack 120 and other components are installed, the cover plate 114 is placed on the side of the frame 111 facing away from the bottom plate 112 to close the open side of the receiving cavity 113, reducing the possibility of external liquids, dust, or foreign objects entering the receiving cavity 113. In other embodiments, the housing 110 may also include an upper housing and a lower housing that overlap each other. The bottom plate 112 and the frame 111 form at least a portion of the lower housing, and the cover plate 114 forms at least a portion of the upper housing. The upper housing and the lower housing together define the receiving cavity 113.

[0039] The frame 111 is a framework structure within the housing 110 surrounding the battery pack 120, providing support and lateral protection for the battery pack 120, and serving as a connection base for the base plate 112, cover plate 114, and other structures within the housing 110. In some embodiments, the frame 111 can be formed by connecting multiple beams end-to-end, or by sequentially connecting multiple sub-frames to form an enclosing structure. In other embodiments, the frame 111 can be integrally formed. The frame 111 can be rectangular, circular, polygonal, or other shapes adapted to the external contour of the battery pack 120. Its interior can be a solid structure or form cavities for weight reduction, reinforcement, or heat exchange medium flow.

[0040] The frame 111 can be made of aluminum, aluminum alloy, copper alloy, steel, stainless steel, engineering plastics, or fiber-reinforced composite materials. The base plate 112 is a structural component in the housing 110 used to support the battery pack 120 and other components. The base plate 112 is located at the bottom of the frame 111 and can be made of aluminum, aluminum alloy, steel, stainless steel, or composite materials with corresponding load-bearing capacity. The base plate 112 can be rectangular, circular, polygonal, or other shapes adapted to the shape of the frame 111. Its dimensions can be determined based on the number, size, and arrangement of the batteries 121 housed in the receiving cavity 113. The frame 111 and the base plate 112 can be made of the same material, or different materials can be used depending on load-bearing, heat dissipation, and weight reduction requirements.

[0041] The fixed connection between the frame 111 and the base plate 112 means that after the frame 111 and the base plate 112 are connected, their relative positions remain fixed during the normal assembly and use of the battery pack 100. In some embodiments, the frame 111 can be fixed to the base plate 112 by welding, riveting, threading, snapping, or bonding. For example, the frame 111 can be welded to the circumferential edge of the base plate 112 to form a continuous connection area with high connection strength. In other embodiments, the frame 111 and the base plate 112 can have corresponding connection holes pre-formed and be fixedly connected by bolts or rivets. Sealant or gaskets can also be provided between the frame 111 and the base plate 112 to improve the sealing performance of the housing 110 while achieving a fixed connection. In other embodiments, the frame 111 and the base plate 112 can also be integrally formed to reduce the connection process and connection gap between them.

[0042] The battery pack 120 is used to store and output electrical energy. Multiple batteries 121 can be connected in series, parallel, or in combination via a busbar to form a battery pack 120 that meets predetermined voltage and capacity requirements. The battery pack 120 is at least partially located within the receiving cavity 113, meaning that the main body of the battery pack 120 is located within the receiving cavity 113, but this does not exclude the possibility that the terminals, connectors, or other auxiliary structures of the battery pack 120 extend at least partially outside the receiving cavity 113 or cooperate with corresponding structures on the housing 110.

[0043] Battery 121 is the basic energy storage unit constituting battery pack 120, capable of storing chemical energy and controllingively converting it into electrical energy. For battery 121 capable of cyclic charging and discharging, after battery 121 is discharged, it can be recharged to restore the active materials inside to a state where they can continue to undergo electrochemical reactions. Battery 121 includes a casing 1211 and a cell 1212 disposed within the casing 1211. The casing 1211 is used to house and protect the cell 1212 and isolate the cell 1212 from the external environment.

[0044] The housing 1211 is a structural component used to form an internal accommodating space. In addition to housing the battery cell 1212, it can also house electrolyte, current collectors, and other electrical connection components. In some embodiments, the housing 1211 may include a housing body with an opening and a cover assembly 1213 that closes the opening. The housing body and the cover assembly 1213 together define the internal space for accommodating the battery cell 1212. The housing 1211 can be made of copper, iron, aluminum, stainless steel, aluminum alloy, plastic, aluminum-plastic composite film, or other materials suitable for forming the external encapsulation structure of the battery. The specific material can be determined based on the structural form, strength requirements, sealing requirements, and insulation requirements of the battery 121.

[0045] In some embodiments of this application, the housing 1211 includes a bottom wall 12111, a side wall 12112 connected to the bottom wall 12111, and a top wall 12113 disposed opposite to the bottom wall 12111 in a third direction. The top wall 12113 refers to the wall portion of the housing 1211 that is away from the bottom wall 12111 in a third direction, and it may be integrally formed with the side wall 12112, or it may be at least partially formed by a cover plate assembly 1213 connected to the side wall 12112. Thus, the descriptions of the bottom wall 12111, side wall 12112, and top wall 12113 can be applied to both cylindrical batteries with continuous annular side walls and prismatic batteries with multiple planar side walls.

[0046] Cell 1212 is the basic unit in battery 121 capable of electrochemical reactions such as charging and discharging. Cell 1212 may include one or more electrode assemblies, which typically include a positive electrode, a negative electrode, and a separator disposed between the positive and negative electrode. Lithium ions intercalate and migrate between the positive and negative electrode to achieve charging and discharging of battery 121. In some embodiments, the positive electrode, separator, and negative electrode can be formed into a wound electrode assembly by winding; in other embodiments, the positive electrode, separator, and negative electrode can be formed into a stacked electrode assembly by lamination. Electrode assemblies for cylindrical batteries can be wound into a generally cylindrical shape, and electrode assemblies for prismatic batteries can be wound or stacked into a generally cuboid shape.

[0047] It should be noted that the sidewall 12112 being perpendicular to the bottom wall 12111 means that the overall extension direction of the sidewall 12112 is perpendicular or approximately perpendicular to the plane containing the bottom wall 12111, and reasonable deviations between the two due to machining tolerances, rounded transitions, or draft structures are allowed. For cylindrical batteries, the sidewall 12112 can be a continuous annular sidewall surrounding the cell 1212; for prismatic batteries, the sidewall 12112 can include multiple planar wall segments surrounding the cell 1212 and transition areas connecting adjacent planar wall segments.

[0048] The bottom wall 12111 of the battery 121 is arranged parallel to the base plate 112, meaning that the plane of the bottom wall 12111 is parallel or substantially parallel to the bearing surface of the base plate 112 used to support the battery 121. In some embodiments, the bottom wall 12111 can be directly disposed on the base plate 112, or it can be indirectly disposed on the base plate 112 through a second adhesive layer 190, a buffer pad, an insulating member, or other intermediate structures. Thus, the base plate 112 can provide a relatively stable bearing base for multiple batteries 121 and make the height direction of the multiple batteries 121 approximately the same.

[0049] The first adhesive layer 130 is used to bond the sidewalls 12112 of at least two adjacent batteries 121, so that the adjacent batteries 121 form a structural connection through the cured first adhesive layer 130, thereby improving the battery pack 120's ability to withstand vibration and impact loads. The first adhesive layer 130 is provided between the sidewalls 12112 of at least two adjacent batteries 121, meaning that at least a portion of the first adhesive layer 130 is located between the sidewalls 12112 of the adjacent batteries 121 and is connected to the corresponding sidewalls 12112 respectively. It is not required that the first adhesive layer 130 be provided between any two adjacent batteries 121 in the battery pack 120, nor is it required that the first adhesive layer 130 be located only on the side of the battery 121. In some embodiments, the first adhesive layer 130 may also extend between the battery 121 and the first separator 140, between the battery 121 and the first baffle 150, or to the bottom or top of the battery 121, to form different ranges of bonding structures according to the structural strength and protection requirements of the battery pack 120. In other embodiments, the first adhesive layer 130 may be disposed only in a local area between adjacent battery sidewalls 12112, for example, in the middle area of ​​adjacent sidewalls 12112 along a third direction, thereby further reducing the amount of adhesive used while meeting the predetermined bonding strength.

[0050] The first battery unit 122 and the second battery unit 123 represent two adjacent battery units separated by the first partition plate 140. Both the first battery unit 122 and the second battery unit 123 include multiple batteries 121. The number of batteries 121 in each battery unit can be the same, or it can be set differently depending on the power capacity, space, and thermal management requirements of the battery pack 100. The first battery unit 122 and the second battery unit 123 are arranged along a first direction, meaning they are located on opposite sides of the first partition plate 140 along the first direction.

[0051] It should be noted that the first battery unit 122 and the second battery unit 123 are only used to illustrate the relationship between two adjacent battery units, and do not limit the battery pack 120 to include only two battery units. When the battery pack 120 includes three or more battery units, any two adjacent battery units along the first direction can be used as the first battery unit 122 and the second battery unit 123 respectively, and a corresponding first partition plate 140 is provided between them.

[0052] The first separator 140 is used to divide the battery pack 120 into multiple battery cells and to provide a connection and support base for the first baffle 150. The first separator 140 can be a solid plate or have an internal cavity. The first separator 140 can be made of metal or insulating material. The metal material can include aluminum, aluminum alloy, steel or stainless steel, etc., and the insulating material can include engineering plastics or fiber-reinforced composite materials, etc.

[0053] In some embodiments, the cavity formed inside the first partition plate 140 can serve as a heat exchange channel and be circulated with a heat exchange medium such as coolant, so that the first partition plate 140 simultaneously constitutes a liquid cooling plate to exchange heat with the batteries 121 located on both sides of it along the first direction, thereby improving the safety of the batteries 121 in use.

[0054] At least one end of the first separator 140 extending beyond the first battery cell 122 and / or the second battery cell 123 along the second direction means that at least one end of the first separator 140 along the second direction protrudes relative to at least one of the first battery cell 122 and the second battery cell 123, and forms an extension region on the outer side of the end of the corresponding battery cell for connection with the first baffle 150. In some embodiments, the first separator 140 may extend beyond both the first battery cell 122 and the second battery cell 123 simultaneously, so that the first baffle 150 can span the corresponding ends of the two battery cells. In other embodiments, the first separator 140 may extend beyond only the first battery cell 122 or the second battery cell 123 to accommodate situations where the two battery cells have different lengths along the second direction or are misaligned at their ends.

[0055] The first baffle 150 is used to prevent the first adhesive layer 130 from overflowing outwards from the battery pack 120 along the second direction. The first baffle 150 can be made of materials such as PC (Polycarbonate), PP (Polypropylene), PC+ABS (Polycarbonate / Acrylonitrile Butadiene Styrene Blend), or PA6 (Polyamide 6). To reduce the possibility of electrical connection between the first baffle 150 and the battery 121, in some embodiments, the first baffle 150 can be made of an insulating material. In other embodiments, the first baffle 150 can also be an insulating plate with a certain degree of flexibility, allowing it to undergo controlled elastic deformation under adhesive pressure, thereby reducing the risk of breakage due to localized stress concentration and resulting in adhesive failure.

[0056] The first baffle 150 and the first partition plate 140 are fixedly connected, either directly or indirectly through a flexible seal 180, a connector, or an adhesive layer. Direct connection can include welding, bonding, snap-fitting, riveting, or threaded fastening; indirect connection can include fixing through an adhesive layer, clamping with an elastic compression member and maintaining relative position by other limiting structures, or fixing with a corresponding mounting structure through an interference fit. The first baffle 150 can be connected to the first surface 141 of the first partition plate 140, or to the end of the first partition plate 140 along the second direction.

[0057] It should be noted that the first baffle 150, the first partition plate 140, and the bottom plate 112 together define the receiving groove 160. This means that the first baffle 150, the first partition plate 140, and the bottom plate 112 each form at least one boundary surface of the receiving groove 160, so that the three together form a receiving area that is confined on at least three sides, without requiring the receiving groove 160 to be completely closed in all directions. When there is a reasonable assembly gap between the first baffle 150, the first partition plate 140, and the bottom plate 112, the corresponding gap can be sealed by the first adhesive layer 130, the flexible seal 180, or other sealing materials.

[0058] See Figure 1 , Figure 3 and Figure 7 As shown, according to some embodiments of this application, the battery pack 100 further includes a second baffle 170, which is disposed at at least one end of the battery pack 120 along a first direction and extends continuously along a second direction; one end of the first baffle 150 along the first direction is fixedly connected to the second baffle 170, and the other end is fixedly connected to the first partition plate 140.

[0059] By setting the second baffle 170, a continuous adhesive-blocking boundary can be formed on the outer side of the battery pack 120 along the first direction, and the first baffle 150, the first partition plate 140, the second baffle 170 and the bottom plate 112 together form a receiving groove 160 with at least four restricted sides, thereby further reducing the possibility of the first adhesive layer 130 overflowing from the side or end of the corresponding battery cell and improving the controllability of the adhesive flow range.

[0060] The second baffle 170 extends continuously along the second direction, meaning that the second baffle 170 covers at least most of the length of the corresponding battery cell along the second direction and forms a continuous or substantially continuous adhesive-blocking boundary within this length range. In some embodiments, the second baffle 170 may be formed by the sidewall of the frame 111 of the housing 110, that is, the frame 111 simultaneously serves as structural protection and adhesive blocking. In other embodiments, the second baffle 170 may be a plate-like component independently disposed within the receiving cavity 113 and fixed to the base plate 112 or the frame 111 by means of welding, bonding, threading, riveting, or snap-fitting.

[0061] The material of the second baffle 170 can be the same as or different from that of the first partition plate 140. The second baffle 170 can be made of metal or insulating material. As an example, the second baffle 170 can preferably be made of metal materials such as aluminum, aluminum alloy, steel or stainless steel, so as to utilize the high structural strength of the metal plate to protect the outer periphery of the battery pack 120 and withstand the force transmitted by the first baffle 150 or the limiting protrusion 142.

[0062] One end of the first baffle 150 is fixedly connected to the second baffle 170 along the first direction, and the other end is fixedly connected to the first partition plate 140. The fixing method can be the same as or different from that used for the first baffle 150 and the first partition plate 140. In some embodiments, both ends of the first baffle 150 can be bonded to the second baffle 170 and the first partition plate 140 respectively to simplify the assembly process. In other embodiments, one end of the first baffle 150 can be inserted into or snapped into the mounting groove formed by the second baffle 170, and the other end can be pressed against the first partition plate 140 by a flexible sealing member 180, thereby balancing installation positioning and sealing requirements.

[0063] See Figure 1 , Figure 3 and Figure 7 As shown, according to some embodiments of this application, there are two second baffles 170, and the two second baffles 170 are respectively disposed at both ends of the battery pack 120 along the first direction.

[0064] With this configuration, the two second baffles 170 can respectively form outer adhesive-blocking boundaries on both sides of the battery pack 120 along the first direction, and cooperate with the corresponding first baffle 150, first partition plate 140 and bottom plate 112, so that the battery cells located at both ends of the battery pack 120 along the first direction can form relatively complete adhesive-containing areas, reducing the possibility of the first adhesive layer 130 overflowing from any outer side of the battery pack 120 along the first direction.

[0065] Similarly, in some embodiments, the two second baffles 170 may be formed by two sidewall portions of the sidewall 111 disposed opposite to each other along the first direction. In other embodiments, the two second baffles 170 may both be independent plates; or, one second baffle 170 may be formed by the sidewall 111 and the other second baffle 170 may be an independent plate, as long as they can be located at opposite ends of the battery pack 120 along the first direction and form corresponding adhesive-resistant boundaries.

[0066] See Figure 2 , Figure 3 and Figure 5 As shown, according to some embodiments of this application, a flexible seal 180 is provided between the first baffle 150 and the first partition plate 140, and the flexible seal 180 is used to seal the gap between the first baffle 150 and the first partition plate 140.

[0067] The flexible seal 180 can be compressed and elastically deformed between the first baffle 150 and the first partition 140 to fill the gap formed between them due to machining tolerances, assembly errors, or thermal expansion and contraction, thereby reducing the possibility of uncured adhesive flowing out of the receiving groove 160 through the gap. The flexible seal 180 can also buffer the contact action between the first baffle 150 and the first partition 140, reducing local stress concentration caused by direct contact between rigid plates.

[0068] In some embodiments, the flexible seal 180 can be disposed between the first baffle 150 and the first partition plate 140 by means of bonding, snapping, embedding, or pressing. In some embodiments, one side of the flexible seal 180 can be bonded to the first baffle 150, and the other side abuts against the first partition plate 140. In other embodiments, the first baffle 150 or the first partition plate 140 can form a mounting groove, and the flexible seal 180 is at least partially embedded in the mounting groove and clamped between the first baffle 150 and the first partition plate 140 after the first baffle 150 is installed in place.

[0069] In some embodiments, the flexible seal 180 may be made of melamine, polyurethane foam, PE (Polyethylene) foam, silicone foam, or CR (Chloroprene Rubber) foam. In other embodiments, the flexible seal 180 may also be made of rubber, silicone, or other flexible materials with elastic compressibility and compatibility with the first adhesive layer 130, selected according to the operating temperature, adhesive composition, and sealing pressure requirements.

[0070] In one specific embodiment of this application, the flexible seal 180 is made of foam material (including the aforementioned polyurethane foam, PE foam, silicone foam, and CR foam). The foam material has multiple micropores and good compression resilience, enabling it to generate a large amount of compression under relatively low assembly pressure. This allows it to adapt to changes in size and shape between the first baffle 150 and the first partition 140, and continuously apply sealing pressure to both. Simultaneously, the relatively low density of the foam material helps reduce the weight of the battery pack 100.

[0071] According to some embodiments of this application, the first adhesive layer 130 is bonded to the first baffle 150, the first partition plate 140 and the flexible seal 180 respectively.

[0072] By bonding the first adhesive layer 130 to the first baffle 150, the first partition plate 140, and the flexible seal 180 respectively, the first adhesive layer 130 can connect the three into a relatively stable combined structure after curing. On the one hand, the first adhesive layer 130 can seal any small gaps that may exist between the first baffle 150, the first partition plate 140, and the flexible seal 180. On the other hand, it can limit the flexible seal 180 from moving or falling off relative to the first baffle 150 and the first partition plate 140, thereby improving the long-term sealing reliability of the receiving groove 160.

[0073] In some embodiments, the first adhesive layer 130 may flow to the side of the flexible seal 180 facing the battery pack 120 during the infusion process, and simultaneously bond the first baffle 150, the first separator 140, and the flexible seal 180 after curing. In other embodiments, a primer or adhesion promoter may be pre-coated on the corresponding surface of the flexible seal 180 to improve the bond strength between the first adhesive layer 130 and the flexible seal 180.

[0074] See Figure 2 and Figure 5 As shown, according to some embodiments of this application, the first partition plate 140 has two first plate surfaces 141 disposed opposite to each other along a first direction, and at least one first plate surface 141 is provided with a limiting protrusion 142, the limiting protrusion 142 protruding in a direction perpendicular to the first plate surface 141; along the second direction, the first baffle 150 is located between the limiting protrusion 142 and the battery pack 120.

[0075] The first plate surface 141 refers to the plate-shaped surface of the first partition plate 140 facing the corresponding battery cell along the first direction. The two first plate surfaces 141 face the first battery cell 122 and the second battery cell 123 respectively, and can be opposite to the sidewall 12112 of the corresponding battery 121 respectively. The limiting protrusion 142 is provided on at least one first plate surface 141, which means that the limiting protrusion 142 is directly formed on the first plate surface 141, or the limiting protrusion 142 is fixed to the first plate surface 141 by a corresponding connecting structure, as long as the limiting protrusion 142 can protrude relative to the first plate surface 141 and provide limiting or support for the first baffle 150.

[0076] It should be noted that the limiting protrusion 142 protrudes in a direction perpendicular to the first plate surface 141. This can be understood as the limiting protrusion 142 protruding from the first plate surface 141 in a direction away from the first partition plate 140. Its overall protrusion direction is perpendicular or approximately perpendicular to the first plate surface 141, and reasonable deviations are allowed due to the shape, connection structure, or manufacturing tolerances of the limiting protrusion 142. The limiting protrusion 142 may protrude towards the first battery unit 122 or towards the second battery unit 123; the two first plate surfaces 141 of the first partition plate 140 may also be provided with limiting protrusions 142 respectively.

[0077] Along the second direction, the first baffle 150 is located between the limiting protrusion 142 and the battery pack 120, meaning that the limiting protrusion 142 is located on the side of the first baffle 150 away from the battery pack 120. When the uncured adhesive of the first adhesive layer 130 applies pressure to the first baffle 150 toward the outside of the battery pack 120, the first baffle 150 can transmit at least part of the force to the limiting protrusion 142, which restricts the first baffle 150 from continuing to deform outward, thereby reducing the possibility of the first baffle 150 being excessively bent, broken, or dislodged from the predetermined sealing position.

[0078] In some embodiments, when the first baffle 150 is a flexible plate and a flexible seal 180 is provided between the first baffle 150 and the first partition plate 140, the limiting protrusion 142 can also cause the first baffle 150 to undergo controlled elastic deformation within a predetermined range. The pressure of the adhesive causes the first baffle 150 to deform toward the limiting protrusion 142. During deformation, the first baffle 150 can compress the flexible seal 180, and the compressed flexible seal 180 fills the gap between the first baffle 150 and the first partition plate 140. When the first baffle 150 abuts against the limiting protrusion 142, the limiting protrusion 142 restricts further deformation of the first baffle 150. This creates a synergistic effect of "first baffle 150 deformed under pressure—flexible seal 180 compressed—limiting protrusion 142 restricting excessive deformation," ensuring the structural reliability of the first baffle 150 while increasing the sealing pressure.

[0079] In some embodiments, the limiting protrusion 142 may be integrally formed with the first partition plate 140, for example, by stamping, casting, extrusion, or injection molding to form a boss or rib on the first plate surface 141 of the first partition plate 140. In other embodiments, the limiting protrusion 142 may be an independent component and fixed to the first plate surface 141 by welding, bonding, threading, snapping, or riveting. The limiting protrusion 142 may also be formed on a connecting pipe or support fixed to the first partition plate 140, so as to simultaneously achieve liquid communication, structural connection, and baffle support using the connecting pipe or support.

[0080] The limiting protrusion 142 can be block-shaped, columnar, strip-shaped, plate-shaped, ring-shaped, or rib-shaped. The side of the limiting protrusion 142 facing the first baffle 150 can be a plane, an arc surface, or a contoured surface adapted to the corresponding area of ​​the first baffle 150. In some embodiments, the limiting protrusion 142 can form a larger support width along the first direction to reduce the contact pressure per unit area of ​​the first baffle 150. In other embodiments, multiple mutually separated limiting protrusions 142 can be provided to reduce the amount of material used in the limiting protrusions 142 while ensuring the support effect.

[0081] See Figure 2 and Figure 5 As shown, according to some embodiments of this application, the limiting protrusion 142 abuts against the first baffle 150.

[0082] By making the limiting protrusion 142 abut against the first baffle 150, the limiting protrusion 142 can directly provide support to the first baffle 150 after it is installed in place, shortening the free deformation stroke of the first baffle 150 from compression deformation to obtaining limiting support, thereby reducing the maximum deflection of the first baffle 150 when subjected to rubber pressure, and enabling the first baffle 150 to apply a more stable compression effect on the flexible seal 180.

[0083] It should be noted that the contact between the limiting protrusion 142 and the first baffle 150 includes both the case where they remain in contact without being glued and the case where a pre-compression contact is formed between them. In some embodiments, the limiting protrusion 142 may only contact a local area of ​​the first baffle 150 to provide focused support to areas of the first baffle 150 that are prone to large deformation. In other embodiments, the limiting protrusion 142 may form a continuous contact area along the width direction of the first baffle 150 to make the force on the first baffle 150 more uniform.

[0084] In other embodiments not falling under the contact limitation of this example, a predetermined gap may be maintained between the limiting protrusion 142 and the first baffle 150 in the un-applied state, and the first baffle 150 may abut against the limiting protrusion 142 after undergoing a predetermined deformation under the pressure of the adhesive. This predetermined gap can be set according to the allowable elastic deformation of the first baffle 150 and the required compression of the flexible seal 180, so that the first baffle 150 has a certain elastic compression stroke before receiving support.

[0085] According to some embodiments of this application, the first baffle 150 is a flexible plate, and the elastic modulus E1 of the first baffle 150 is 300MPa to 10000MPa.

[0086] The flexible plate in this application refers to a plate-like structure in which the first baffle 150 can produce recoverable elastic deformation when subjected to glue injection pressure or assembly pressure, and at least partially restore its original shape after unloading, and does not mean that the first baffle 150 does not have the structural strength required for support or glue blocking.

[0087] By setting the elastic modulus E1 of the first baffle 150 within the aforementioned range, the first baffle 150 can possess both controlled deformation capability and the structural strength required for adhesive blocking. When E1 is less than 300 MPa, the first baffle 150 may deform excessively under the pressure of the adhesive, causing a significant change in the boundary position of the receiving groove 160 and increasing the possibility of seal failure; when E1 is greater than 10000 MPa, the deformation capability of the first baffle 150 may be insufficient, making it difficult to fully compress the flexible seal 180 through elastic deformation, and potentially causing significant stress concentration under local loads.

[0088] As an example, E1 can be 300MPa, 500MPa, 800MPa, 1000MPa, 1500MPa, 2000MPa, 2500MPa, 3000MPa, 4000MPa, 5000MPa, 6000MPa, 7000MPa, 8000MPa, 9000MPa, or 10000MPa, or other values ​​within the range of 300MPa to 10000MPa. The specific value can be determined based on the material, thickness D, span, potting pressure of the first baffle 150, and the support position of the limiting protrusion 142.

[0089] In some embodiments, the first baffle 150 may be made of polypropylene, polyamide, polycarbonate, thermoplastic polyurethane, or other engineering plastics with elastic deformation capabilities. In other embodiments, the first baffle 150 may be a composite plate formed of a fiber-reinforced resin plate, a thin metal plate, and an insulating elastic layer, or a plate-like structure with locally thinned areas, corrugated areas, or bending areas, so as to maintain a predetermined strength as a whole while giving the predetermined area a large elastic deformation capability.

[0090] See Figure 2 , Figure 3 and Figure 5 As shown, according to some embodiments of this application, a flexible seal 180 is provided between the first baffle 150 and the first partition plate 140, and the elastic modulus of the flexible seal 180 is E2, where E1 > E2.

[0091] By making the elastic modulus E1 of the first baffle 150 greater than the elastic modulus E2 of the flexible seal 180, the flexible seal 180 can be more easily compressed and deformed relative to the first baffle 150. When the first baffle 150 is subjected to the pressure of the adhesive or the reaction force of the limiting protrusion 142, the first baffle 150 can maintain its basic adhesive-blocking shape and transmit the pressure to the flexible seal 180. The flexible seal 180 then preferentially undergoes compression deformation to fill the assembly gap, thereby improving the sealing reliability between the first baffle 150 and the first partition plate 140 while ensuring the structural strength of the first baffle 150.

[0092] In some embodiments, the ratio of E1 to E2 can be determined based on the required compression ratio of the flexible seal 180 and the allowable deflection of the first baffle 150. In other embodiments, the flexible seal 180 can also achieve a predetermined compression amount within the controlled deformation range of the first baffle 150 by adjusting the thickness, porosity, or compression hardness of the flexible seal 180, without having to change the material of the first baffle 150.

[0093] For example, in some embodiments, the elastic modulus E2 of the flexible seal is between 0.003 MPa and 0.3 MPa, which enables the flexible seal 180 to have good compressive deformation capacity to fill the assembly gap between the first baffle 150 and the first partition plate 140, and to maintain a certain rebound capacity when subjected to continuous compression. When E2 is less than 0.003 MPa, the flexible seal 180 may be too soft and prone to over-compression under assembly pressure or rubber pressure, making it difficult to maintain a stable sealing thickness; when E2 is greater than 0.3 MPa, the compressive deformation capacity of the flexible seal 180 may be insufficient, making it difficult to fully accommodate the gap between the first baffle 150 and the first partition plate 140 caused by machining tolerances or assembly errors.

[0094] As an example, the elastic modulus E2 of the flexible seal 180 can be 0.003 MPa, 0.005 MPa, 0.008 MPa, 0.01 MPa, 0.02 MPa, 0.03 MPa, 0.05 MPa, 0.08 MPa, 0.1 MPa, 0.15 MPa, 0.2 MPa, 0.25 MPa or 0.3 MPa, or other values ​​in the range of 0.003 MPa to 0.3 MPa.

[0095] See Figure 2 , Figure 3 and Figure 5 As shown, according to some embodiments of this application, the first baffle 150 includes two second plate surfaces 151 disposed opposite each other along a second direction, and the second plate surface 151 of the first baffle 150 facing the battery pack 120 is at least partially formed as an arc surface.

[0096] The second plate surface 151 refers to the two plate-shaped surfaces of the first baffle 150 that are arranged opposite each other along the second direction. One of the second plate surfaces 151 faces the battery pack 120 and the receiving groove 160, and the other second plate surface 151 faces away from the battery pack 120 and faces the limiting protrusion 142. By forming at least a portion of the second plate surface 151 facing the battery pack 120 as an arc surface, the first baffle 150 can have an arched or arc-shaped cross section, and the force exerted by the adhesive on the arc surface can be dispersed along the arc surface towards the connecting end of the first baffle 150, thereby reducing the bending stress in the middle of the first baffle 150 and improving the ability of the first baffle 150 to resist the pressure of the adhesive. In addition, the arc surface further allows the adhesive layer to bend outward after the adhesive is injected into the battery pack and the adhesive layer is squeezed by the first baffle. The extrusion pressure of the adhesive layer and the resistance of the limiting part can redirect the extrusion pressure of the adhesive layer to the compression of the flexible seal, further improving the sealing performance of the seal and reducing the risk of adhesive layer overflow. The first baffle can form an arc surface or a non-arc surface, such as other arc surfaces, curved surfaces, bent surfaces, or other protruding surfaces, when it protrudes in the direction away from the battery pack.

[0097] When battery 121 is a cylindrical battery, the arc surface can also be adapted to the outer periphery of adjacent cylindrical batteries, allowing the first baffle 150 to be closer to the cylindrical batteries while maintaining the necessary safety clearance, thereby reducing the ineffective space that needs to be filled with adhesive between the end of battery pack 120 and the first baffle 150. The arc surface can be recessed towards battery pack 120, causing the first baffle 150 to bulge outward from battery pack 120 along the second direction; or it can be set to other bending directions according to the specific contour of the end of battery 121.

[0098] In some embodiments, the arcuate surface may be formed by bending the first baffle 150 as a whole, so that the first baffle 150 has a continuous arcuate profile along the entire width of the first direction. In other embodiments, only the middle region of the first baffle 150 along the first direction is formed as an arcuate surface, while the end regions of the first baffle 150 near the first partition plate 140 or the second baffle 170 remain flat, so as to form a stable fixed connection and sealing fit.

[0099] According to some embodiments of this application, the radius of curvature R1 of the arc surface is 40 mm to 2000 mm.

[0100] By setting the radius of curvature R1 within the aforementioned range, a balance can be achieved between the arched load-bearing capacity, elastic deformation stroke, and installation space of the first baffle 150. When R1 is less than 40mm, the curvature of the arc surface is large, and the first baffle 150 may form a large degree of local bending and stress concentration in the end connection area; when R1 is greater than 2000mm, the arc surface tends to be gentle, and the ability of the first baffle 150 to disperse the pressure of the rubber material through the arc structure and the compression stroke formed on the flexible seal 180 after being compressed may be reduced.

[0101] As an example, R1 can be 40mm, 50mm, 80mm, 100mm, 150mm, 200mm, 300mm, 400mm, 500mm, 600mm, 800mm, 1000mm, 1200mm, 1500mm, 1800mm, or 2000mm, or other values ​​within the range of 40mm to 2000mm. The radius of curvature R1 of the arc surface can be determined by combining the span of the first baffle 150 along the first direction, the thickness D of the first baffle 150, the elastic modulus E1 of the first baffle 150, and the pre-compression of the flexible seal 180.

[0102] See Figure 1 and Figure 6 As shown, according to some embodiments of this application, the number of limiting protrusions 142 is at least two, and the at least two limiting protrusions 142 are spaced apart along a third direction.

[0103] By setting at least two limiting protrusions 142 at intervals along the third direction, support points or support areas can be formed at different height positions of the first baffle 150, thereby increasing the effective support range of the limiting protrusions 142 on the first baffle 150, making the force and deformation of the first baffle 150 along the third direction more uniform, and reducing the possibility of local bulging or bending of the first baffle 150 between adjacent support positions.

[0104] In some embodiments, each limiting protrusion 142 may have the same shape, size, and protrusion height, and be evenly spaced along a third direction to provide relatively uniform support for the first baffle 150. In other embodiments, each limiting protrusion 142 may have different shapes, sizes, or protrusion heights, and be positioned at different locations according to the pressure distribution of the first baffle 150 along a third direction. For example, larger limiting protrusions 142 may be provided in areas where the pressure on the first adhesive layer 130 is relatively high.

[0105] It should be noted that in other embodiments where at least two limiting protrusions 142 are not required, only one limiting protrusion 142 may be provided. This limiting protrusion 142 may have a large extension length or support area along a third direction to support the main stress area of ​​the first baffle 150. The provision of one or more limiting protrusions 142 can be selected based on the height, rigidity, and rubber pressure of the first baffle 150.

[0106] See Figure 6 As shown, the total height covered by the multiple limiting protrusions 142 along a third direction can be denoted as H5. H5 can be determined based on the effective adhesive blocking height of the first baffle 150, the height H4 of the first adhesive layer 130, and the area of ​​the first baffle 150 that is prone to deformation. As an example, H5 can be 15mm, 40mm, 70mm, 100mm, 130mm, or 170mm. By having the multiple limiting protrusions 142 cover the main pressure-bearing area of ​​the first baffle 150, the support efficiency can be improved while avoiding an excessive number or size of the limiting protrusions 142.

[0107] See Figure 6 As shown, according to some embodiments of this application, the spacing S between two adjacent limiting protrusions 142 along a third direction is 4 mm to 100 mm.

[0108] By setting the interval distance S within the aforementioned range, the unsupported span of the first baffle 150 between two adjacent limiting protrusions 142 can be controlled. When S is less than 4 mm, the distance between adjacent limiting protrusions 142 is too small, which may cause repetition of the support area, structural complexity, and increased material consumption; when S is greater than 100 mm, the unsupported span of the first baffle 150 between two adjacent limiting protrusions 142 is too large, which is prone to large local deflection under the pressure of the rubber compound.

[0109] As an example, S can be 4mm, 5mm, 8mm, 10mm, 15mm, 20mm, 25mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, or 100mm, or other values ​​within the range of 4mm to 100mm. It should be noted that the interval distance S can be the distance between the centers of two adjacent limiting protrusions 142, or the minimum distance between the edges of two adjacent limiting protrusions 142 that are close to each other. The specific measurement method should be consistent when determining the parameter values.

[0110] See Figure 1 and Figure 2 As shown, according to some embodiments of this application, at least one end of the first baffle 150 extends beyond the limiting protrusion 142 along a third direction.

[0111] This configuration allows the limiting protrusion 142 to avoid at least one end of the first baffle 150 along a third direction, reducing the possibility of stress concentration caused by the limiting protrusion 142 directly abutting the end of the first baffle 150 or the end connection area, and allowing the end of the first baffle 150 to retain space for connection and sealing with the base plate 112, cover plate 114 or other components.

[0112] See Figure 1 and Figure 2 As shown, in some embodiments, the upper end of the first baffle 150 extends beyond the limiting protrusion 142 in a third direction to prevent the limiting protrusion 142 from interfering with the connection between the top of the first baffle 150 and other adhesive-blocking structures. In other embodiments, the lower end of the first baffle 150 extends beyond the limiting protrusion 142 in a third direction so that the lower end of the first baffle 150 is fixedly connected to the base plate 112; the upper and lower ends of the first baffle 150 may also both extend beyond the limiting protrusion 142, so that the limiting protrusion 142 provides concentrated support for the central stress-bearing area of ​​the first baffle 150.

[0113] The center of the limiting protrusion 142 along a third direction can be correspondingly arranged with the center of the first baffle 150 along a third direction, so that the limiting protrusion 142 supports the area in the middle of the first baffle 150 that is prone to maximum deflection. In other embodiments, the center of the limiting protrusion 142 can be offset relative to the center of the first baffle 150 according to the liquid level height of the first adhesive layer 130 or the pressure distribution of the adhesive, as long as it can avoid the end of the first baffle 150 and provide support for the main stress area.

[0114] See Figure 1 , Figure 3 , Figure 4 and Figure 7 As shown, according to some embodiments of this application, the battery pack 100 further includes a second baffle 170 disposed on one side of the battery pack 120 along the first direction, and one end of the limiting protrusion 142 along the first direction is fixedly connected to the first partition plate 140, and the other end is fixedly connected to the second baffle 170.

[0115] By fixing the two ends of the limiting protrusion 142 to the first partition plate 140 and the second baffle plate 170 respectively, the limiting protrusion 142 can form a connection structure with two-end support between the first partition plate 140 and the second baffle plate 170. When the first baffle plate 150 transmits the pressure of the rubber material to the limiting protrusion 142, the limiting protrusion 142 can transmit the force to the first partition plate 140 and the second baffle plate 170 respectively, reducing the possibility of the limiting protrusion 142 itself deflecting or loosening, thereby providing more stable support for the first baffle plate 150.

[0116] In some embodiments, the limiting protrusion 142 may be a support beam, connecting rod, or connecting pipe connecting the first partition plate 140 and the second baffle 170, with its two ends fixed by welding, bonding, threaded connection, or snap-fit. In other embodiments, one end of the limiting protrusion 142 may be integrally formed with the first partition plate 140, and the other end may be inserted into or abutted in the limiting groove formed by the second baffle 170, and fixed by fasteners or adhesive materials.

[0117] In some embodiments, when the first partition plate 140 is a liquid-cooled plate, the limiting protrusion 142 may also be formed by at least a portion of a connecting pipe connecting the first partition plate 140 to another heat exchange structure, or disposed on the outer wall of the connecting pipe. Thus, the connecting pipe can provide support for the first baffle 150 while enabling coolant communication, which helps to reduce the number of independent support components and improve the utilization rate of the internal space of the battery pack 100.

[0118] According to some embodiments of this application, at least one end of the flexible seal 180 extends beyond the first baffle 150 along a third direction.

[0119] By extending at least one end of the flexible seal 180 beyond the first baffle 150 in a third direction, the flexible seal 180 can cover the area near the end of the first baffle 150 where gaps are likely to form, and form an extended seal between the end of the first baffle 150 and the adjacent component, thereby reducing the possibility that the adhesive will bypass the first baffle 150 from the upper or lower end and flow out of the receiving groove 160.

[0120] In some embodiments, the upper end of the flexible seal 180 may be higher than the upper end of the first baffle 150 to seal the gap between the upper end of the first baffle 150 and the first partition plate 140. In other embodiments, the lower end of the flexible seal 180 may be lower than the lower end of the first baffle 150, forming a seal in the connection area between the first baffle 150 and the base plate 112; the upper and lower ends of the flexible seal 180 may also extend beyond the upper and lower ends of the first baffle 150, respectively.

[0121] It should be noted that, in other embodiments, the end of the flexible seal 180 along a third direction may also be flush with the corresponding end of the first baffle 150, or located inside the corresponding end of the first baffle 150. These different positional relationships can be selected based on whether other sealing structures are provided at the end of the first baffle 150 and the height of the adhesive liquid level, as long as the flexible seal 180 can seal the main gap between the first baffle 150 and the first partition plate 140.

[0122] See Figure 5 As shown, according to some embodiments of this application, the thickness D of the first baffle 150 is 0.5 mm to 2 mm.

[0123] The thickness D of the first baffle 150 refers to the distance between the two second plate surfaces 151 of the first baffle 150 arranged opposite each other along the second direction. When different areas of the first baffle 150 have different thicknesses, the thickness D can refer to the thickness of the main area of ​​the first baffle 150 used to bear the pressure of the rubber material, or it can be characterized by the minimum thickness, average thickness, or thickness at a specified position according to design requirements.

[0124] By setting the thickness D of the first baffle 150 within the aforementioned range, the bending strength, elastic deformation capacity, weight, and installation space of the first baffle 150 can be balanced. When D is less than 0.5 mm, the bending stiffness of the first baffle 150 may be insufficient, and it is prone to excessive deflection or breakage under the pressure of the adhesive layer 130. When D is greater than 2 mm, the weight and space occupied by the first baffle 150 increase, and its ability to compress the flexible seal 180 may be reduced due to excessive overall stiffness.

[0125] As an example, D can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, or 2mm, or other values ​​within the range of 0.5mm to 2mm. The thickness D can be determined by combining the elastic modulus E1 of the material of the first baffle 150, the span along the first direction, the height H1 along the third direction, the number and spacing S of the limiting protrusions 142, and the potting pressure.

[0126] In some embodiments, the first baffle 150 may have a uniform thickness so that it can be processed by extrusion, injection molding, stamping or cutting. In other embodiments, the first baffle 150 may have a thickened portion in the area corresponding to the limiting protrusion 142, or a thinned portion in the area where elastic deformation is required, so that different areas of the first baffle 150 respectively meet the support and deformation requirements.

[0127] See Figure 6 and Figure 9 As shown, according to some embodiments of this application, along a third direction, the height of the first baffle 150 is H1, and the housing 1211 of the battery 121 includes a bottom wall 12111 and a top wall 12113 disposed opposite to each other along a third direction. The distance between the top wall 12113 and the bottom wall 12111 is H2, and the ratio of H1 to H2 is 0.5 to 1.2.

[0128] The height H1 of the first baffle 150 refers to the dimension of the first baffle 150 along a third direction. The distance H2 between the top wall 12113 and the bottom wall 12111 can be understood as the housing height of the battery 121 along a third direction; when the top wall 12113 or the bottom wall 12111 has a step, a protrusion or a depression, H2 can be the distance between the two main planes, or the maximum outer contour height of the battery 121 along a third direction.

[0129] By limiting the ratio of H1 to H2 within the aforementioned range, the adhesive-blocking height of the first baffle 150 can be matched with the height of the battery 121. When H1 / H2 is less than 0.5, the height of the first baffle 150 covering the side of the battery 121 is relatively small, and the formable height of the first adhesive layer 130 and its end adhesive-blocking capability may be insufficient. When H1 / H2 is greater than 1.2, the first baffle 150 may be significantly higher than the battery 121, increasing material usage and upper space occupation, and may even interfere with the arrangement of the busbar, acquisition components, or housing cover 114.

[0130] As an example, H1 / H2 can be 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, 1.05, 1.1, 1.15, or 1.2, or other values ​​within the range of 0.5 to 1.2. The specific range of H1 / H2 can be determined based on the required height H4 of the first adhesive layer 130, the bonding area of ​​the sidewall 12112 of the battery 121, and the arrangement space of the components above the battery pack 120.

[0131] In some embodiments, H1 / H2 may be less than 1, such that the top of the first baffle 150 is lower than the top wall 12113 of the battery 121, thereby reducing the amount of material used in the first baffle 150 while meeting the requirements for partial side bonding. In other embodiments, H1 / H2 may be equal to 1, such that the top of the first baffle 150 is substantially flush with the top of the battery 121; or, H1 / H2 may be greater than 1, such that the top of the first baffle 150 extends beyond the top of the battery 121, thereby improving the ability to block higher adhesive layers or adhesive material around components above the battery 121.

[0132] According to some embodiments of this application, H1 / H2 ≥ 0.5.

[0133] With this configuration, the first baffle 150 covers at least half the height of the battery 121 along a third direction, which can form an effective adhesive barrier boundary in the main area of ​​the sidewall 12112 of the battery 121, and make the first adhesive layer 130 form an adhesive area with a certain height between the sidewalls 12112 of adjacent batteries 121, thereby improving the overall structural strength of the battery pack 120, while preventing the adhesive from flowing to the outside of the battery pack 120 if the height of the first baffle 150 is too small.

[0134] When H1 / H2 equals 0.5, the first baffle 150 can cover approximately half the height of the battery 121 along a third direction; when H1 / H2 is greater than 0.5 and less than 1, the first baffle 150 can cover most of the height of the sidewall 12112 of the battery 121; when H1 / H2 is equal to or greater than 1, the first baffle 150 can cover the entire side height of the battery 121 or extend further above the top of the battery 121. These different relationships can be selected based on the required bonding height and adhesive blocking requirements of the first adhesive layer 130.

[0135] See Figure 10 As shown, according to some embodiments of this application, the first baffle 150 is fixedly connected to the base plate 112 at one end along a third direction near the base plate 112.

[0136] By fixing the lower end of the first baffle 150 to the bottom plate 112, the first baffle 150 can be positioned and the bottom gap between the first baffle 150 and the bottom plate 112 can be sealed, reducing the possibility of the adhesive flowing out from the bottom of the receiving tank 160; at the same time, the bottom plate 112 can provide support for the first baffle 150, making it less likely for the first baffle 150 to shift or tip over when subjected to the pressure of the adhesive.

[0137] In some embodiments, the first baffle 150 can be fixedly connected to the base plate 112 by means of bonding, welding, riveting, threading, or snap-fitting. Preferably, the first baffle 150 can be bonded to the base plate 112 by an adhesive layer. The material of the adhesive layer can be the same as that of the first adhesive layer 130 so as to be formed in a single glue pouring process; the material of the adhesive layer can also be different from that of the first adhesive layer 130 and have a greater adhesive strength than that of the first adhesive layer 130, so as to improve the fixed reliability between the first baffle 150 and the base plate 112.

[0138] In other embodiments, the base plate 112 may be provided with a positioning groove or a positioning protrusion, and the lower end of the first baffle 150 is embedded in the positioning groove or engaged with the positioning protrusion, and then sealed and fixed by adhesive material. The lower end of the first baffle 150 may also first abut against the base plate 112, and then the pressing state between the first baffle 150 and the base plate 112 is maintained by limiting members connected to other parts of the first baffle 150.

[0139] See Figures 1 to 3 and Figure 5 As shown, according to some embodiments of this application, the number of first baffles 150 is at least two, the at least two first baffles 150 are arranged along a first direction, and a first partition plate 140 is provided between two adjacent first baffles 150.

[0140] With this configuration, multiple first baffles 150 can be respectively positioned to correspond to different battery cells, and are separated from each other by first partition plates 140 located between adjacent first baffles 150, so that each battery cell has a corresponding adhesive-blocking structure at its end along the second direction. As a result, the battery pack 120 can form multiple local receiving grooves 160 that are repeatedly arranged along the first direction, and the amount of filling and the flow range of the first adhesive layer 130 in each battery cell can be controlled separately, reducing the possibility of cumulative assembly errors or deformation caused by the large size of a single long baffle.

[0141] In some embodiments, each battery cell may have a first baffle 150 at its end along the second direction, and the ends of two adjacent first baffles 150 may be connected to opposite sides of the same first partition plate 140. In other embodiments, two adjacent first baffles 150 may be integrally connected at the ends of the first partition plate 140 or connected by a common flexible seal 180 to reduce the number of individual parts and improve the sealing continuity between adjacent receiving grooves 160.

[0142] See Figure 1 and Figure 4 As shown, according to some embodiments of this application, the number of first baffles 150 is at least two, and at least two first baffles 150 are respectively disposed on the outer sides of both ends of the battery pack 120 along the second direction.

[0143] By providing first baffles 150 at both ends of the battery pack 120 along the second direction, the first adhesive layer 130 can be blocked from overflowing outward from both ends of the battery pack 120. This restricts the first adhesive layer 130 along the second direction between the two first baffles 150, thus making it suitable for arrangements where neither end of the battery pack 120 has an adhesive-blocking boundary formed by the frame 111 or other structures.

[0144] In some embodiments, each battery cell may have a first baffle 150 at both ends along the second direction, so that each battery cell forms a receiving groove 160 closed at both ends. In other embodiments, the first baffle 150 may be provided at both ends of only some battery cells, while a retaining boundary is formed at one end of the housing 110 using the frame 111 of the housing 110, so as to reduce the number of first baffles 150 according to the specific spatial layout inside the housing 110.

[0145] See Figures 1 to 3 and Figure 5 As shown, according to some embodiments of this application, there are multiple first partition plates 140, and the multiple first partition plates 140 are spaced apart along a first direction.

[0146] Multiple first separators 140 can divide the battery pack 120 into three or more battery cells along the first direction, thus confining the injection and spreading of the first adhesive layer 130 to a smaller local area. Compared to allowing the adhesive to flow across the entire width of the battery pack 120, multiple first separators 140 can shorten the lateral path of the adhesive from the injection point to each battery cell 121, reducing differences in curing degree or uneven distribution of the adhesive due to excessively long flow paths, and enabling separate assembly and quality inspection of each battery cell.

[0147] Multiple first partition plates 140 may be arranged parallel to each other to form multiple battery cells with the same or different widths. In some embodiments, each first partition plate 140 may be a liquid-cooled plate to exchange heat on both sides of each battery cell. In other embodiments, the multiple first partition plates 140 may include liquid-cooled plates and support plates alternately arranged along a first direction, so that some first partition plates 140 perform heat exchange functions and some first partition plates 140 perform separation and support functions, thereby balancing heat dissipation capacity, cost, and weight.

[0148] It should be noted that, in this application, a row of batteries 121 refers to a plurality of batteries 121 arranged sequentially along the second direction. In some embodiments, at least one row of batteries 121 may be provided between two adjacent first partition plates 140. When a row of batteries 121 is provided between two adjacent first partition plates 140, each row of batteries 121 can be located between the corresponding two first partition plates 140, so that the first partition plates 140 form adhesive-blocking boundaries on both sides of the row of batteries 121 along the first direction, thereby shortening the flow distance of the adhesive along the first direction, reducing the possibility of adhesive overflowing into the area where the adjacent row of batteries 121 is located, and reducing the amount of adhesive required to form the first adhesive layer 130.

[0149] In other embodiments, at least two rows of batteries 121 can be arranged between two adjacent first partition plates 140 along a first direction, and each row of batteries 121 includes a plurality of batteries 121 arranged along a second direction. Thus, at least two rows of batteries 121 can share the first partition plates 140 located on both sides of them along the first direction. While using the first partition plates 140 to restrict the flow range of the adhesive, the number of first partition plates 140 and the space they occupy are reduced, thereby improving the space utilization and volumetric energy density of the battery pack 120 while ensuring the adhesive-blocking effect.

[0150] The number of rows of batteries 121 arranged between two adjacent first partition plates 140 can be determined based on the dimensions of the batteries 121 along the first direction, the flow properties of the first adhesive layer 130, the allowable potting distance, and the space utilization requirements of the battery pack 100. For example, one, two, three, four, or more rows of batteries 121 can be arranged between two adjacent first partition plates 140.

[0151] According to some embodiments of this application, the spacing L between two adjacent first partition plates 140 along the first direction is 20mm to 100mm.

[0152] The spacing L between two adjacent first partition plates 140 determines the available width of the corresponding battery cell along the first direction and the number of batteries 121 that can be arranged in the battery cell. By setting L within the above range, a balance can be achieved between the space utilization of the battery pack 100 and the uniformity of the distribution of the first adhesive layer 130. When L is less than 20 mm, the number of first partition plates 140 may be excessive and occupy a large internal space, which is not conducive to improving the volumetric energy density of the battery pack 100. When L is greater than 100 mm, the width of a single battery cell is large, the flow path of the adhesive in the battery cell increases, which may cause uneven distribution of the first adhesive layer 130 and reduce the support and heat exchange effect of the first partition plates 140 on the batteries 121.

[0153] As an example, L can be 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, 85mm, 90mm, 95mm, or 100mm, or other values ​​within the range of 20mm to 100mm. L can be the minimum distance between the first plate surfaces 141 of two adjacent first partition plates 140 facing each other, or it can be the distance between the center surfaces of two adjacent first partition plates 140. The specific measurement reference should be consistent with the method of determining the parameter range.

[0154] See Figure 9 and Figure 10 As shown, according to some embodiments of this application, along a third direction, the height of the first partition plate 140 is H3, and the distance between the top wall 12113 and the bottom wall 12111 of the battery 121 is H2, where H2≤H3.

[0155] By making the height H3 of the first separator 140 greater than or equal to the height H2 of the battery 121, the first separator 140 can cover at least the entire side height of the battery 121 along a third direction, thereby forming a higher separation boundary between the first battery cell 122 and the second battery cell 123. This reduces the possibility that the first adhesive layer 130 located between the sidewalls 12112 of the battery 121 will cross the first separator 140 and enter the adjacent battery cell, and can increase the lateral limiting, support or heat exchange area of ​​the first separator 140 for the battery 121.

[0156] In some embodiments, H3 can be equal to H2, such that the top of the first separator 140 is substantially flush with the top of the battery 121, reducing the space occupied by the first separator 140 above the battery pack 120 while forming a complete side partition. In other embodiments, H3 can be greater than H2, such that the top of the first separator 140 protrudes above the top of the battery 121 to block adhesive material near the top of the battery 121 and to provide separation and support for insulation, busbars, or other components above the battery pack 120.

[0157] The height ratio H3 / H2 of the first separator 140 and the battery 121 is between 0.5 and 1.2. As an example, H3 / H2 can be 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, 1.05, 1.1, 1.15, or 1.2, or other values ​​within the range of 0.5 to 1.2. The height H2 of the battery 121 can be between 80mm and 200mm, and specifically, it can be 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, 160mm, 170mm, 180mm, 190mm, or 200mm, or other values ​​within the range of 80mm to 200mm.

[0158] It should be noted that H2≤H3 is mainly used to prevent the first separator 140 from blocking the first adhesive layer 130 located within the height range of the side of the battery 121. In some embodiments, the height H4 of the first adhesive layer 130 can also be greater than H3, so that the portion of the first adhesive layer 130 that extends above the first separator 140 forms a controlled connection on the upper part of the adjacent battery cell, thereby improving the overall connection strength between the first battery cell 122 and the second battery cell 123; at this time, a second baffle 170 with a height greater than the first separator 140 can be used to prevent the adhesive material in the extended portion from overflowing to the outside of the battery pack 120.

[0159] In other embodiments where H2≤H3 is not required, the height H3 of the first separator 140 can also be less than the height H2 of the battery 121, allowing the first adhesive layer 130 to form a partial connection above the first separator 140, thereby achieving bonding between adjacent battery cells according to structural strength requirements. This embodiment and the embodiment where H2≤H3 can be applied to different scenarios emphasizing independent potting of individual cells or emphasizing overall bonding of the battery pack, respectively.

[0160] See Figure 1 and Figure 4 As shown, according to some embodiments of this application, the length direction of the first separator 140 and the length direction of the battery pack 120 are both parallel to the second direction.

[0161] With this configuration, the first partition plate 140 can extend along the length of the battery pack 120 and form a continuous or substantially continuous partition boundary between the first battery cell 122 and the second battery cell 123, allowing the adhesive to flow and spread mainly along the second direction within each battery cell, reducing the possibility of the adhesive flowing across the first partition plate 140 into adjacent battery cells; at the same time, the end of the first partition plate 140 along the second direction is convenient to connect with the first baffle 150 located on the outer side of the end of the battery pack 120, thereby forming a receiving groove 160 with a clear structural relationship.

[0162] In some embodiments, the first separator 140 may continuously cover the entire length of the battery pack 120 along the second direction and extend beyond each battery cell at at least one end of the battery pack 120. In other embodiments, the first separator 140 may consist of a plurality of separator segments connected or spaced apart sequentially along the second direction, as long as the plurality of separator segments can collectively define the main separation boundary between adjacent battery cells.

[0163] See Figure 5 As shown, according to some embodiments of this application, the thickness D1 of the first partition plate 140 is 2 mm to 10 mm.

[0164] The thickness D1 of the first partition plate 140 refers to the distance between the two first plate surfaces 141 of the first partition plate 140 arranged opposite each other along the first direction. When the first partition plate 140 is a liquid-cooled plate and a heat exchange channel is formed inside, D1 can refer to the overall thickness of the liquid-cooled plate, including the two outer plate surfaces and the channel area between them.

[0165] By setting the thickness D1 within the aforementioned range, the structural strength of the first partition plate 140, the space for heat exchange channels, the weight, and the utilization rate of the internal space of the battery pack 100 can be balanced. When D1 is less than 2 mm, the first partition plate 140 may have difficulty withstanding the expansion force of the battery 121, the supporting force transmitted by the limiting protrusion 142, or the coolant pressure inside the liquid cooling plate; when D1 is greater than 10 mm, the space and weight occupied by the first partition plate 140 increase, which is not conducive to improving the volumetric energy density and gravimetric energy density of the battery pack 100.

[0166] As an example, D1 can be 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, or 10mm, or other values ​​within the range of 2mm to 10mm. In some embodiments, the first partition plate 140 can have a uniform thickness. In other embodiments, the first partition plate 140 can be locally thickened in the area where the limiting protrusion 142, connecting pipe, or fixing structure is provided, and locally thinned in the area where heat is exchanged with the battery 121, in order to balance structural strength and heat exchange efficiency.

[0167] See Figure 1 As shown, according to some embodiments of this application, the battery pack 100 further includes a second baffle 170 disposed at at least one end of the battery pack 120 along a first direction; along a third direction, the height of the first partition 140 is less than the height of the second baffle 170.

[0168] By making the height of the second baffle 170 greater than the height of the first separator 140, the second baffle 170 can form a higher peripheral adhesive barrier boundary on the outer side of the battery pack 120 along the first direction. When the adhesive liquid level of the first adhesive layer 130 is higher than the top of the first separator 140, or when the adhesive liquid crosses the first separator 140 due to fluctuations during the filling process, the second baffle 170 can still prevent the adhesive liquid from overflowing further to the outside of the battery pack 120, thereby ensuring the reliability of the adhesive barrier around the battery pack 120 while allowing the formation of local adhesive layer connections on the upper part of adjacent battery cells.

[0169] In some embodiments, the top of the second baffle 170 may be flush with the top of the first baffle 150, forming a uniformly high peripheral adhesive barrier boundary at the ends and sides of the battery pack 120. In other embodiments, the top of the second baffle 170 may be higher than the top of the first baffle 150 or the top of the battery 121 to block and protect the adhesive material around the busbar, acquisition assembly, or other components located above the battery 121.

[0170] The height difference between the first separator 140 and the second baffle 170 can be determined based on whether the first adhesive layer 130 needs to cross the first separator 140 and the safety margin required for the outer adhesive layer. This height difference can be kept the same at corresponding positions of multiple battery cells, or it can be adjusted according to the amount of adhesive injected and the component arrangement at different positions.

[0171] See Figure 10 As shown, according to some embodiments of this application, along a third direction, the height of the first adhesive layer 130 is H4, the distance between the top wall 12113 and the bottom wall 12111 of the battery 121 is H2, and the ratio of H4 to H2 is 0.5 to 1.2.

[0172] The height H4 of the first adhesive layer 130 refers to the extension dimension of the first adhesive layer 130 along a third direction, and can be characterized by the maximum height of the first adhesive layer 130 from its lowest position to its highest position.

[0173] By limiting the ratio of H4 to H2, the coverage height of the first adhesive layer 130 over the sidewall 12112 of the battery 121 and the amount of adhesive used in the battery pack 120 can be controlled. When H4 / H2 is less than 0.5, the height of the first adhesive layer 130 covering the sidewall 12112 of the battery 121 is small, and the bonding area and connection strength between adjacent batteries 121 may be insufficient; when H4 / H2 is greater than 1.2, the amount and weight of the first adhesive layer 130 increase, and it may cover parts that do not need to be coated or affect later maintenance.

[0174] As an example, H4 / H2 can be 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, 1.05, 1.1, 1.15, or 1.2, or other values ​​within the range of 0.5 to 1.2. The specific range of H4 / H2 can be determined based on the required bonding area of ​​the sidewall 12112 of the battery 121, the material strength of the first adhesive layer 130, the vibration and impact loads borne by the battery pack 120, and lightweight requirements.

[0175] In some embodiments, H4 / H2 may be less than 1, so that the first adhesive layer 130 only covers a portion of the height of the sidewall 12112 of the battery 121, thereby reducing the amount of adhesive used and preserving maintenance space on the upper part of the battery 121. In other embodiments, H4 / H2 may be equal to 1, so that the first adhesive layer 130 substantially covers the entire side height of the battery 121; or, H4 / H2 may be greater than 1, so that the first adhesive layer 130 extends above the top of the battery 121 and at least partially covers the busbar, acquisition assembly, or other connecting components, thereby improving the overall structural strength of the battery pack 120 and providing insulation, vibration damping, or protection for the aforementioned components.

[0176] In some embodiments, the height H4 of the first adhesive layer 130 is 50 mm to 210 mm, which allows the first adhesive layer 130 to cover at least a portion of the sidewall 12112 of the battery 121 and form an adhesive area between adjacent batteries 121 that meets the structural fixing requirements, while avoiding an excessively large height of the first adhesive layer 130 that would increase unnecessary adhesive usage. When H4 is less than 50 mm, the coverage height of the first adhesive layer 130 over the sidewall 12112 is small, and the adhesive area and connection strength between adjacent batteries 121 may be insufficient; when H4 is greater than 210 mm, the amount and weight of the first adhesive layer 130 increase, and it may extend excessively above the battery 121, affecting the arrangement of busbars, acquisition components, or other components.

[0177] As an example, the height H4 of the first adhesive layer 130 can be 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, 160mm, 170mm, 180mm, 190mm, 200mm or 210mm, or other values ​​within the range of 50mm to 210mm.

[0178] According to some embodiments of this application, the first adhesive layer 130 is a foamed adhesive layer. A foamed adhesive layer refers to an adhesive layer in which air bubbles are formed before or during curing, and at least part of the pore structure is retained after curing. Compared to a solid adhesive layer of the same volume, the foamed adhesive layer has a lower density and weight, which can reduce the amount and weight of the first adhesive layer 130 while maintaining the connection between adjacent batteries 121; the foamed adhesive layer also has better gap-filling, buffering, and energy-absorbing capabilities, can accommodate dimensional tolerances between adjacent batteries 121, and mitigate relative displacement caused by battery expansion, vibration, or impact.

[0179] The receiving groove 160, jointly defined by the first baffle 150, the first partition plate 140, and the bottom plate 112, can constrain the flow and expansion direction of the foam during the foaming process, allowing the foam to preferentially enter between the sidewalls 12112 of adjacent batteries 121 and spread evenly within the battery cell, reducing the ineffective expansion of the foam to the outside of the battery pack 120. Therefore, the use of a foam layer can cooperate with the above-mentioned baffle structure to further improve the mass energy density of the battery pack 100 while ensuring the structural strength of the battery pack 120.

[0180] In some embodiments, the first adhesive layer 130 may be formed of polyurethane foam, silicone foam, or epoxy resin foam potting compound, and may be formed into an open-cell, closed-cell, or hybrid open-cell structure by chemical foaming, physical foaming, or a combination of both. In other embodiments, the first adhesive layer 130 may also be formed by a combination of pre-formed foam strips and field-filled adhesive, wherein the pre-formed foam strips are used to pre-define local gaps, and the field-filled adhesive is used to fill the remaining space between the pre-formed foam strips and the battery 121.

[0181] The foaming ratio, cured density, cell size, and compressive modulus of the foamed adhesive layer can be determined based on the gap between adjacent cells 121, the volume of the receiving groove 160, and the required connection strength of the battery pack 120. The foaming ratio should not be too small to avoid insufficient weight reduction and gap filling effect; the foaming ratio should also not be too large to avoid excessive foaming pressure that could cause excessive deformation of the first baffle 150 or cause the adhesive to exceed the baffle boundary.

[0182] See Figure 10As shown, according to some embodiments of this application, a second adhesive layer 190 is provided between the bottom wall 12111 of the battery 121 and the bottom plate 112, and the second adhesive layer 190 is bonded to the bottom wall 12111 and the bottom plate 112 respectively.

[0183] The second adhesive layer 190 can fix the battery 121 to the base plate 112 along a third direction, so that the base plate 112 provides reliable support for the battery 121 and transmits the vibration load, impact load or expansion force generated by the battery 121 to the housing 110. The first adhesive layer 130 forms a lateral connection on the side of the battery 121, and the second adhesive layer 190 forms a vertical connection on the bottom of the battery 121. The combination of the two can improve the overall connection strength and vibration resistance of the battery pack 120.

[0184] When the base plate 112 has a heat dissipation function or has internal heat exchange channels, the second adhesive layer 190 can also fill the tiny gap between the bottom wall 12111 and the base plate 112 to reduce the contact thermal resistance between them, so that the heat generated by the battery 121 can be transferred to the base plate 112 through the second adhesive layer 190. For this purpose, the second adhesive layer 190 can contain thermally conductive fillers and has both adhesive and thermally conductive functions.

[0185] In some embodiments, the second adhesive layer 190 may continuously cover all or most of the bottom wall 12111 to obtain a larger bonding area and a more uniform heat conduction path. In other embodiments, the second adhesive layer 190 may be arranged in strips, dots, grids, or sections to reduce the amount of adhesive used while meeting the required strength, and to reserve space for gas venting or the arrangement of bottom parts.

[0186] According to some embodiments of this application, the second adhesive layer 190 is a structural adhesive layer. A structural adhesive layer refers to an adhesive layer used to bond and fix structural components within the battery pack 100, and capable of transmitting design loads over a long period after curing. The structural adhesive layer has high adhesive strength and can possess properties such as aging resistance, fatigue resistance, corrosion resistance, and stable performance to meet the structural fixation requirements of the battery pack 100 during its expected service life.

[0187] The second adhesive layer 190 is a structural adhesive layer, which can improve the connection strength between the battery 121 and the base plate 112. The vibration load, impact load and inertial force borne by the battery 121 are transmitted to the base plate 112 through the second adhesive layer 190, thereby improving the installation stability of the battery 121 and reducing the possibility of the battery 121 separating from the base plate 112 or undergoing relative displacement under long-term vibration, temperature cycling or impact environment.

[0188] In some embodiments, the structural adhesive layer may be formed from epoxy resin structural adhesive, polyurethane structural adhesive, acrylic structural adhesive, or silane-modified structural adhesive. In some embodiments, the structural adhesive may be a two-component epoxy resin structural adhesive, a two-component polyurethane structural adhesive, a two-component acrylic structural adhesive, or a two-component silane-modified structural adhesive. The two-component structural adhesive may undergo a curing reaction after the two components are mixed to form a second adhesive layer 190 having predetermined adhesive strength and durability.

[0189] In some embodiments, the structural adhesive may use a resin or rubber material with electrical insulating properties as the matrix material, such as epoxy resin, polyurethane, silicone rubber, or acrylic resin, to reduce the possibility of unintended electrical connections between the battery 121 and the base plate 112. In other embodiments, the structural adhesive may also be doped with thermally conductive fillers and / or insulating fillers to improve the thermal conductivity and electrical insulation properties of the second adhesive layer 190 while maintaining adhesive strength. The thermally conductive filler may include alumina, boron nitride, aluminum nitride, or other insulating particles with thermal conductivity, allowing the heat generated by the battery 121 to be transferred to the base plate 112 via the second adhesive layer 190.

[0190] In other embodiments, when there is no electrical insulation requirement between the battery 121 and the base plate 112, metal particles, carbon materials, or other conductive media may be doped into the structural adhesive to give the second adhesive layer 190 electrical and / or thermal conductivity. The specific materials and filler types of the structural adhesive can be determined according to the bonding strength, thermal conductivity, electrical insulation performance, and environmental resistance requirements between the battery 121 and the base plate 112.

[0191] The material of the second adhesive layer 190 can be the same as or different from that of the first adhesive layer 130. In some embodiments, the adhesive strength of the second adhesive layer 190 after curing is greater than that of the first adhesive layer 130 after curing, so that the second adhesive layer 190 mainly undertakes the structural fixation between the battery 121 and the base plate 112, while the first adhesive layer 130 mainly undertakes the filling, buffering and lateral connection between adjacent batteries 121.

[0192] See Figure 10 As shown, according to some embodiments of this application, the first adhesive layer 130 and the second adhesive layer 190 are bonded to each other.

[0193] The first adhesive layer 130 and the second adhesive layer 190 are bonded together, meaning that the two adhesive layers are in direct contact at the interface and form an adhesive interface capable of transmitting loads. When the two adhesive layers are made of the same material and are continuously cured, they can also fuse together at the interface without any visible boundary. With this configuration, the first adhesive layer 130 and the second adhesive layer 190 can together form a continuous or substantially continuous adhesive layer network extending from the side of the battery 121 to the bottom of the battery 121, allowing the lateral and vertical loads on the battery 121 to be transmitted between the two adhesive layers, reducing the possibility of stress concentration at the interface of a single adhesive layer, and improving the sealing performance of the bottom of the receiving cavity 113.

[0194] In some embodiments, a second adhesive layer 190 can be applied to the base plate 112 first, and the battery 121 can be placed thereon. Then, a first adhesive layer 130 can be poured between adjacent batteries 121, so that the first adhesive layer 130, which is not yet fully cured, and the second adhesive layer 190 can be cured together at the interface. In other embodiments, the second adhesive layer 190 can be cured or pre-cured first, and then its bonding strength with the subsequent first adhesive layer 130 can be improved by surface polishing, plasma treatment, applying a primer, or setting connection grooves.

[0195] In other embodiments, the first adhesive layer 130 and the second adhesive layer 190 may also be spaced apart to meet the requirements for maintenance or disassembly of the side adhesive layer and the bottom adhesive layer of the battery 121 that need to be independent of each other.

[0196] According to some embodiments of this application, the first partition plate 140 is a metal plate, the first baffle 150 is an insulating plate, and an insulating layer is provided between the first partition plate 140 and the sidewall 12112 of at least one adjacent battery 121.

[0197] The first separator 140, made of metal, has high strength and thermal conductivity, enabling it to withstand the expansion forces of adjacent batteries 121 and improve the heat exchange efficiency of the battery pack 120 when used as a liquid cooling plate or heat-conducting plate. The first baffle 150, made of insulation, forms a protective boundary at the end of the battery pack 120 while reducing the risk of electrical connection between the first baffle 150 and batteries 121, busbars, or other conductive components. The insulating layer electrically isolates the metallic first separator 140 from the casing 1211 of adjacent batteries 121, thereby improving the electrical safety of the battery pack 100 even when the first separator 140 is conductive.

[0198] The insulating layer can be disposed on the first plate surface 141 of the first partition plate 140 facing the battery 121, or on the side wall 12112 of the battery 121 facing the first partition plate 140, or both. The insulating layer can cover the entire area of ​​the first partition plate 140 and the battery 121 opposite each other, or at least cover the local area where the two may come into contact, where the creepage distance is small, or where the electric field strength is high.

[0199] In some embodiments, the first partition plate 140 may be made of aluminum alloy plate, steel plate, stainless steel plate, or metal composite plate, and may consist of two metal plates connected to form an internal heat exchange channel. The first baffle 150 may be made of polypropylene, polycarbonate, polyamide, polyphenylene ether, rubber, insulating fiber reinforced composite material, or other insulating materials. In other embodiments, the first baffle 150 may include a metal skeleton and an insulating layer covering the outside of the metal skeleton to simultaneously achieve high structural strength and insulation performance.

[0200] In some embodiments, the insulating layer may be an insulating film, insulating tape, or insulating pad bonded to the first separator 140 or the battery 121. In other embodiments, the insulating layer may be an insulating coating formed by spraying, dipping, powder coating, or electrophoresis, or it may be an insulating adhesive layer formed between the first adhesive layer 130 and the battery 121.

[0201] See Figures 1 to 4 As shown, according to some embodiments of this application, the battery 121 is a square-shell battery. The casing 1211 of the square-shell battery is in the shape of a quadrangular prism. The sidewall 12112 includes a first sidewall 12114 and a second sidewall 12115 arranged adjacent to each other. The area of ​​the first sidewall 12114 is larger than the area of ​​the second sidewall 12115. The first sidewall 12114 is arranged opposite to the first partition plate 140.

[0202] It should be noted that the term "quadrangular prism" as used in this application does not require that the edges of the shell 1211 be absolutely sharp angles, nor does it require that each sidewall be an absolutely flat surface; the edges of the shell 1211 may be provided with rounded corners, chamfers, or transitional curved surfaces, and each sidewall may also have a slight arc formed during manufacturing or a reinforcing structure. As long as the shell 1211 has four main sidewall regions along the circumference and is generally square or rectangular prism-shaped, it can be regarded as a quadrangular prism as used in this application.

[0203] The sidewalls 12112 of the prismatic battery may include two first sidewalls 12114 and two second sidewalls 12115 arranged opposite to each other, with the first sidewalls 12114 connected to the adjacent second sidewalls 12115. The area of ​​the first sidewall 12114 is larger than the area of ​​the second sidewall 12115, so the first sidewall 12114 can also be referred to as the large sidewall, and the second sidewall 12115 can also be referred to as the small sidewall.

[0204] The first sidewall 12114 is disposed opposite to the first partition plate 140, meaning that the first sidewall 12114 faces the first partition plate 140, and the projection of the first sidewall 12114 on the first partition plate 140 along the first direction at least partially overlaps with the first partition plate 140. Direct contact between the first sidewall 12114 and the first partition plate 140 is not required. The first sidewall 12114 and the first partition plate 140 may be spaced apart, abutted against each other, or connected by the first adhesive layer 130 and / or an insulating layer.

[0205] By aligning the larger first sidewall 12114 with the first partition plate 140, the relative area between the battery 121 and the first partition plate 140 can be increased, which is beneficial for increasing the heat exchange area when the first partition plate 140 is used as a liquid cooling plate or a heat conducting plate. When an adhesive layer is provided between the first sidewall 12114 and the first partition plate 140, the bonding area can also be increased, improving the fixing stability of the battery 121 along the first direction. Furthermore, the arrangement pitch of the battery 121 along the second direction is determined by the width of the smaller second sidewall 12115, which is beneficial for forming a more compact longitudinal arrangement.

[0206] In some embodiments, the first sidewall 12114 may be substantially parallel to the first partition plate 140 and bonded together by a thermally conductive insulating adhesive layer. In other embodiments, an assembly gap may be maintained between the first sidewall 12114 and the first partition plate 140, wherein an elastic thermally conductive pad or insulating layer is provided in the assembly gap to absorb dimensional tolerances and expansion deformation of the battery 121.

[0207] See Figure 2 As shown, according to some embodiments of this application, the battery 121 is a square-shell battery. The casing 1211 of the square-shell battery is in the shape of a quadrangular prism. The sidewall 12112 includes a first sidewall 12114 and a second sidewall 12115 arranged adjacent to each other. The area of ​​the first sidewall 12114 is larger than the area of ​​the second sidewall 12115. The second sidewall 12115 is arranged opposite to the first partition plate 140. The thickness D of the first baffle 150 satisfies: 0.7mm≤D≤2mm.

[0208] The second sidewall 12115 is disposed opposite to the first partition plate 140, meaning that the smaller second sidewall 12115 faces the first partition plate 140, and the projection of the second sidewall 12115 onto the first partition plate 140 along the first direction at least partially overlaps with the first partition plate 140. The second sidewall 12115 and the first partition plate 140 can be spaced apart, abutted against each other, or connected by the first adhesive layer 130 and / or an insulating layer. In this case, the larger first sidewall 12114 faces the second direction and is opposite to the first baffle 150 disposed on the outer side of the end of the battery pack 120 along the second direction.

[0209] Since the first baffle 150 faces the first sidewall 12114 of the prismatic battery with a large area, the area of ​​force exerted on the first baffle 150 when the first adhesive layer 130 foams or flows may increase. When the battery 121 expands or shifts along the second direction, it may also transmit a larger force to the first baffle 150. By appropriately increasing the thickness D of the first baffle 150 compared to a typical arrangement, the bending stiffness and load-bearing capacity of the first baffle 150 can be improved, reducing the possibility of excessive bending leading to sealing failure of the receiving groove 160.

[0210] It should be noted that the thickness D of the first baffle 150 in this embodiment should be greater than the 0.5 mm typically used for the thickness D of the first baffle 150. The thickness D in this embodiment can be 0.7 mm, 0.9 mm, 1.3 mm, 1.7 mm, or 2 mm.

[0211] In some embodiments, the bending resistance of the first baffle 150 can be improved by increasing the overall thickness D of the first baffle 150. In other embodiments, the rigidity of the first baffle 150 facing the first sidewall 12114 region can also be improved by providing reinforcing ribs, folded edges, sandwich structures, or locally thickened areas, thereby withstanding greater pressure from the adhesive and the force of the battery without significantly increasing the overall weight of the first baffle 150.

[0212] See Figure 8 and Figure 9 As shown, according to some embodiments of this application, battery 121 is a cylindrical battery with a diameter of R2, satisfying: R2≥30mm.

[0213] The casing 1211 of the cylindrical battery may include a circular bottom wall 12111, a top wall 12113 disposed opposite to the bottom wall 12111, and a cylindrical side wall 12112 connecting the bottom wall 12111 and the top wall 12113. The side wall 12112 is perpendicular to the bottom wall 12111, meaning that the generatrix of the cylindrical side wall 12112 is perpendicular to the plane containing the bottom wall 12111.

[0214] Using cylindrical batteries with a diameter R2 of not less than 30mm reduces the number of batteries 121 and the number of interfaces between adjacent batteries 121 while maintaining the same battery pack capacity 100. This reduces the number of welding, assembly, and fixing components, and lowers the weight of the casing and connection structure per unit capacity. Under the condition that the overall dimensions of the battery pack 100 and the design spacing between adjacent batteries 121 are essentially the same, increasing the diameter of the cylindrical batteries also reduces the number of batteries 121, the cumulative gaps between adjacent batteries 121, and the total volume, thereby reducing the amount of adhesive required and the risk of adhesive overflow. The receiving groove 160 formed by the first baffle 150 and the first separator 140 restricts the flow of the first adhesive layer 130 within the gaps between larger cylindrical batteries, concentrating the adhesive for connecting the sidewalls 12112 and reducing outward overflow. This helps to balance the pack strength of large-size cylindrical batteries with the weight of the adhesive used.

[0215] As an example, R2 can be 30mm, 32mm, 35mm, 40mm, 46mm, 50mm, or other dimensions greater than 50mm. The upper limit of R2 can be determined based on the height of the battery pack 100, thermal management capabilities, individual cell failure isolation requirements, and manufacturing capabilities. In some embodiments, multiple cylindrical cells can be arranged in a rectangular array. In other embodiments, multiple cylindrical cells can be arranged in a triangular array or a honeycomb array to reduce the gaps between adjacent cylindrical cells and improve the space utilization of the receiving cavity 113.

[0216] According to some embodiments of this application, at least a portion of the batteries 121 in the first battery cell 122 and at least a portion of the batteries 121 in the second battery cell 123 are offset along a second direction.

[0217] The misalignment along the second direction refers to the fact that the coordinates of the central axes of at least one pair of batteries 121 located on both sides of the first separator 140 are different in the second direction, or that the projections of the at least one pair of batteries 121 along the first direction on the same reference plane do not completely coincide. The misalignment distance can be greater than zero and less than the arrangement pitch of two adjacent batteries 121 in the same battery cell along the second direction, and can be approximately half of the arrangement pitch.

[0218] By misaligning the cylindrical batteries on both sides of the first separator 140 along the second direction, the expansion forces and heat from the batteries 121 on both sides can be avoided from concentrating on the same position of the first separator 140 along the second direction. This makes the load and heat flow distribution on the first separator 140 more uniform, reducing the possibility of local deformation or excessive local temperature rise. When the first separator 140 or the heat-conducting layers on its two sides have arc-shaped regions that are adapted to the sidewalls 12112 of the cylindrical batteries, the misaligned arrangement can also make full use of the space between adjacent arc-shaped regions, improving the compactness of the structural layout.

[0219] In some embodiments, all the batteries 121 in the first battery cell 122 may be periodically arranged with a fixed offset distance relative to all the batteries 121 in the second battery cell 123, so that the load and heat exchange state on both sides of the first partition plate 140 are more uniform. In other embodiments, only some of the batteries 121 near the glue injection port, the corner of the housing 110, the heat exchange medium inlet, or the structurally weak area may be offset, while the remaining batteries 121 may be aligned, to adapt to local space or thermal management requirements.

[0220] The electrical device 200 provided in this application is described below. The electrical device 200 described below can be referred to in correspondence with the battery pack 100 described above.

[0221] See Figure 11 As shown, according to some embodiments of this application, an electrical device 200 is also provided, which includes the battery pack 100 of any of the above embodiments.

[0222] Since the electrical equipment 200 uses the aforementioned battery pack 100, the receiving groove 160 formed by the first baffle 150, the first separator 140, and the bottom plate 112 can reduce the overflow of the first adhesive layer 130 to the outside of the battery pack 120 and promote the uniform dispersion of the adhesive material in each battery cell, thereby reducing the weight of ineffective adhesive material while ensuring the structural strength of the battery pack 120. As a result, the electrical equipment 200 can achieve a higher mass energy density, better vibration and impact resistance, and reduce material and manufacturing costs.

[0223] It should be noted that, in this embodiment, the battery pack 100 can serve as both a power source and a driving power source for the electrical device 200. When the electrical device 200 is a vehicle, the battery pack 100 can replace or partially replace fuel, natural gas, or other energy sources to provide driving power for the vehicle. The electrical device 200 can be an energy storage device, an electric ship, an aircraft, a laptop computer, a power tool, an electric bicycle, an electric motorcycle, an electric car, military equipment, or aerospace equipment, etc.

[0224] The following example uses a vehicle as an electrical appliance 200 for illustration. See [link / reference] Figure 11 As shown, Figure 11The diagram illustrates the structure of a vehicle in some embodiments of this application. The vehicle can be a new energy vehicle, such as a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle. The battery pack 100 can be located at the bottom, front, or rear of the vehicle to provide electrical energy. The vehicle may also include a controller 210 and a load, which may include a drive motor, on-board control components, navigation components, lighting components, and other on-board electrical components. The controller 210 is connected to both the battery pack 100 and the load, and controls the battery pack 100 to output electrical energy to the load to meet the vehicle's power needs during starting, navigation, driving, and other operating conditions.

[0225] In some embodiments, the electrical device 200 may include a battery pack 100, the output voltage and capacity of which can be determined according to the power consumption requirements of the electrical device 200. In other embodiments, the electrical device 200 may include multiple battery packs 100, which can be electrically connected in series, parallel, or a hybrid configuration. Connecting multiple battery packs 100 in series can increase the output voltage; connecting multiple battery packs 100 in parallel can increase the output capacity and output current; a hybrid configuration refers to the simultaneous presence of series and parallel connections in the connection of multiple battery packs 100, so that the multiple battery packs 100 can collectively meet the voltage, capacity, and power requirements of the electrical device 200.

[0226] In some embodiments, multiple battery packs 100 can be connected in series to form a cluster-level battery structure, and the number of battery packs 100 included in each battery cluster can be determined according to preset power supply voltage and capacity requirements. Multiple battery clusters can be connected in parallel to jointly supply power to the electrical device 200. In other embodiments, the electrical device 200 may further include a switching control unit connected to the multiple battery packs 100. The switching control unit can be integrated into the controller 210 or independent of the controller 210. The switching control unit is used to control the connection or disconnection of each battery pack 100 to the power supply circuit of the electrical device 200, so as to realize power supply switching, fault isolation, or coordinated power supply among the multiple battery packs 100.

[0227] In some embodiments, each battery pack 100 may include one or more battery groups 120. When the battery pack 100 includes multiple battery groups 120, the multiple battery groups 120 may be electrically connected in series, parallel, or mixed connection. Each battery group 120 may include multiple batteries 121, and at least some of the batteries 121 may be connected in series to form a battery cluster that meets a preset power supply voltage requirement. In other embodiments, the battery group 120 may also include at least one backup battery 121, which may be configured in a bypass manner and can be selectively connected to the power supply circuit according to the operating state of the battery cluster, so as to maintain the power supply capability of the battery group 120 when some batteries 121 fail or have insufficient power.

[0228] See Figure 12 As shown, Figure 12 Schematic diagrams of the battery pack 100 in other embodiments of this application are shown. The battery pack 100 includes a housing 110 and a battery pack 120. The housing 110 includes a frame 111 and a base plate 112. The frame 111 and the base plate 112 are fixedly connected and together define a receiving cavity 113. The battery pack 120 is at least partially disposed within the receiving cavity 113 and on the base plate 112. The housing 110 provides housing space for the battery pack 120 and other components within the battery pack 100, and provides dustproof, waterproof, and mechanical protection for the internal components to reduce the possibility of adverse effects from external liquids, foreign objects, or impact loads on the battery pack 120.

[0229] In some embodiments, the housing 110 may further include a cover plate 114, which covers the side of the frame 111 facing away from the bottom plate 112 to close the receiving cavity 113. The shape of the housing 110 is not particularly limited; for example, it may be cuboid or other shapes adapted to the installation space of the electrical equipment 200. The frame 111, bottom plate 112, and cover plate 114 may be made of copper, iron, aluminum, stainless steel, aluminum alloy, plastic, or composite materials, and the materials of different components may be the same or different.

[0230] In some embodiments, one or more battery packs 120 may be disposed within the receiving cavity 113, each battery pack 120 comprising a plurality of batteries 121, which may be arranged along a first direction and / or a second direction parallel to the base plate 112. The battery pack 100 may also include a battery management system, a thermal management system, an electrical connection system, structural components, and protective components. The electrical connection system may include high-voltage connectors, low-voltage connectors, and wiring harnesses, etc., and the structural components may include brackets, beams, and connectors, etc. The above components may be disposed within the receiving cavity 113, and the receiving cavity 113 may be closed by a cover plate 114 to form a complete functional unit capable of outputting electrical energy.

[0231] The battery management system is used to detect the operating status of the battery pack 120 and each battery 121, and to manage the charging status, discharging status, and thermal status of the battery pack 120 and each battery 121. The battery management system may include a battery management unit, a battery monitoring circuit, sensors, and corresponding electronic control devices. The battery monitoring circuit can be used to collect operating parameters such as voltage and temperature of each battery 121, and the sensors can be used to detect parameters such as current, temperature, pressure, or insulation status of the battery pack 120.

[0232] In some embodiments, the battery management system may further include at least one processor and a memory communicatively connected to the processor. The memory may be located internally or externally to the battery management system. In other embodiments, the memory may be remotely located and communicatively connected to the battery management system via a communication network.

[0233] This application does not impose any special limitation on the geometry of the battery 121; the battery 121 may be cylindrical, square, or other shapes suitable for placement within the battery pack 120. For example, Figure 13 A battery 121 in the form of a square-shell battery is shown. Figure 8 and Figure 9 A battery 121 in the form of a cylindrical battery is shown.

[0234] The battery 121 includes a housing 1211 and a battery cell 1212 disposed within the housing 1211. The housing 1211 includes a bottom wall 12111, a side wall 12112 connected to the bottom wall 12111, and a top wall 12113 disposed opposite to the bottom wall 12111. In some embodiments, the battery 121 may further include a cover assembly 1213, which is disposed at one end of the side wall 12112 away from the bottom wall 12111 and at least partially forms the top wall 12113. The cover assembly 1213 may have at least one positive terminal and at least one negative terminal, which are electrically connected to the corresponding polarity of the battery cell 1212, respectively.

[0235] The battery cell 1212 may include one or more electrode assemblies, which may be formed by stacking or winding a positive electrode, a negative electrode, and a separator. The battery 121 is the basic unit constituting the battery pack 120, capable of storing chemical energy and controllably converting it into electrical energy. For a battery 121 capable of cyclic charging and discharging, after discharge, its internal active materials can be restored to a state capable of continuing electrochemical reactions by charging. Multiple batteries 121 can be further combined to form the battery pack 120, and the number of batteries 121 included in the battery pack 120 can be adjusted according to the power supply voltage, capacity, installation space, and operating conditions of the electrical device 200.

[0236] Finally, it should be noted that the above embodiments are only used to illustrate this application and are not intended to limit this application. Although this application has been described in detail with reference to the embodiments, those skilled in the art should understand that various combinations, modifications, or equivalent substitutions of the technical solutions of this application do not depart from the spirit and scope of the technical solutions of this application and should be covered within the scope of the claims of this application.

Claims

1. A battery pack, characterized in that, Including the casing and battery pack; The housing includes a frame and a bottom plate. The frame and the bottom plate are fixedly connected and together define a receiving cavity. The battery pack is at least partially disposed in the receiving cavity and disposed on the bottom plate. The battery pack includes multiple batteries. Each battery includes a housing and a cell disposed within the housing. The housing includes a bottom wall and a side wall connected to the bottom wall. The side wall is perpendicular to the bottom wall and is arranged parallel to the base plate. A first adhesive layer is provided between the side walls of at least two adjacent batteries. The battery pack includes a first battery unit and a second battery unit arranged along a first direction. Both the first battery unit and the second battery unit include a plurality of batteries. A first partition plate is provided between the first battery unit and the second battery unit. The first direction and the second direction are both parallel to the base plate and perpendicular to each other. At least one end of the first partition plate along the second direction extends beyond the first battery unit and / or the second battery unit. It also includes a first baffle, which is disposed on the outside of at least one end of the battery pack along the second direction. The first baffle is fixedly connected to the first partition plate. The first baffle, the first partition plate and the bottom plate together define a receiving groove, and the first adhesive layer is at least partially located in the receiving groove.

2. The battery pack according to claim 1, characterized in that, The battery pack further includes a second baffle, which is disposed at at least one end of the battery pack along the first direction and extends continuously along the second direction; One end of the first baffle along the first direction is fixedly connected to the second baffle, and the other end is fixedly connected to the first partition plate.

3. The battery pack according to claim 2, characterized in that, There are two second baffles, which are respectively located at both ends of the battery pack along the first direction.

4. The battery pack according to claim 1, characterized in that, A flexible sealing element is provided between the first baffle and the first partition plate, and the flexible sealing element is used to seal the gap between the first baffle and the first partition plate.

5. The battery pack according to claim 4, characterized in that, The flexible seal is made of foam.

6. The battery pack according to claim 4, characterized in that, The first adhesive layer is bonded to the first baffle, the first partition plate and the flexible seal respectively.

7. The battery pack according to any one of claims 1 to 6, characterized in that, The first partition plate has two first plate surfaces arranged opposite each other along the first direction, and at least one of the first plate surfaces is provided with a limiting protrusion, which protrudes in a direction perpendicular to the first plate surface; along the second direction, the first baffle is located between the limiting protrusion and the battery pack.

8. The battery pack according to claim 7, characterized in that, The limiting protrusion abuts against the first baffle.

9. The battery pack according to claim 7, characterized in that, The first baffle is a flexible plate with an elastic modulus of 300 MPa to 10000 MPa.

10. The battery pack according to claim 9, characterized in that, A flexible sealing element is provided between the first baffle and the first partition plate, and the elastic modulus of the first baffle is greater than that of the flexible sealing element.

11. The battery pack according to claim 7, characterized in that, The first baffle includes two second plate surfaces disposed opposite each other along the second direction, and the second plate surface of the first baffle facing the battery pack is at least partially formed as an arc surface.

12. The battery pack according to claim 11, characterized in that, The radius of curvature of the arc surface is 40 mm to 2000 mm.

13. The battery pack according to claim 7, characterized in that, The number of the limiting protrusions is at least two, and the at least two limiting protrusions are spaced apart along a third direction, which is perpendicular to the base plate.

14. The battery pack according to claim 13, characterized in that, The distance between two adjacent limiting protrusions along the third direction is 4mm to 100mm.

15. The battery pack according to claim 7, characterized in that, Along a third direction, at least one end of the first baffle extends beyond the limiting protrusion, and the third direction is perpendicular to the base plate.

16. The battery pack according to claim 7, characterized in that, The battery pack also includes a second baffle disposed on one side of the battery pack along the first direction. One end of the limiting protrusion along the first direction is fixedly connected to the first partition plate, and the other end is fixedly connected to the second baffle.

17. The battery pack according to claim 4, characterized in that, Along a third direction, at least one end of the flexible seal extends beyond the first baffle, and the third direction is perpendicular to the base plate.

18. The battery pack according to any one of claims 1 to 6, characterized in that, The thickness of the first baffle is 0.5 mm to 2 mm.

19. The battery pack according to any one of claims 1 to 6, characterized in that, The battery casing also includes a top wall disposed opposite to the bottom wall. In a third direction, the ratio of the height of the first baffle to the distance between the top wall and the bottom wall is 0.45 to 1.2, and the third direction is perpendicular to the bottom plate.

20. The battery pack according to claim 19, characterized in that, The ratio of the height of the first baffle to the distance between the top wall and the bottom wall is greater than or equal to 0.

5.

21. The battery pack according to any one of claims 1 to 6, characterized in that, The first baffle is fixedly connected to the base plate at one end along a third direction near the base plate, and the third direction is perpendicular to the base plate.

22. The battery pack according to any one of claims 1 to 6, characterized in that, The number of the first baffles is at least two, and the at least two first baffles are arranged along the first direction, with a first partition plate provided between two adjacent first baffles.

23. The battery pack according to any one of claims 1 to 6, characterized in that, The number of the first baffles is at least two, and the at least two first baffles are respectively disposed on the outer sides of both ends of the battery pack along the second direction.

24. The battery pack according to any one of claims 1 to 6, characterized in that, The number of the first partition plates is multiple, and the multiple first partition plates are spaced apart along the first direction.

25. The battery pack according to claim 24, characterized in that, The distance between two adjacent first partition plates along the first direction is 20mm to 100mm.

26. The battery pack according to any one of claims 1 to 6, characterized in that, Along a third direction, the height of the first partition plate is H3, and the battery casing also includes a top wall disposed opposite to the bottom wall, the distance between the top wall and the bottom wall is H2, H2≤H3, and the third direction is perpendicular to the bottom plate.

27. The battery pack according to any one of claims 1 to 6, characterized in that, The length direction of the first separator and the length direction of the battery pack are both parallel to the second direction.

28. The battery pack according to any one of claims 1 to 6, characterized in that, The thickness of the first partition plate is 2 mm to 10 mm.

29. The battery pack according to any one of claims 1 to 6, characterized in that, The battery pack further includes a second baffle disposed at at least one end of the battery pack along the first direction; Along a third direction, the height of the first partition plate is less than the height of the second baffle plate, and the third direction is perpendicular to the base plate.

30. The battery pack according to any one of claims 1 to 6, characterized in that, The battery casing also includes a top wall disposed opposite to the bottom wall, and the ratio of the height of the first adhesive layer to the distance between the top wall and the bottom wall along a third direction is 0.5 to 1.

2.

31. The battery pack according to any one of claims 1 to 6, characterized in that, The first adhesive layer is a foamed adhesive layer.

32. The battery pack according to any one of claims 1 to 6, characterized in that, A second adhesive layer is provided between the bottom wall of the battery and the base plate, and the second adhesive layer is bonded to the bottom wall and the base plate respectively.

33. The battery pack according to claim 32, characterized in that, The second adhesive layer is a structural adhesive layer.

34. The battery pack according to claim 32, characterized in that, The first adhesive layer and the second adhesive layer are bonded to each other.

35. The battery pack according to any one of claims 1 to 6, characterized in that, The first separator is a metal plate, the first baffle is an insulating plate, and an insulating layer is provided between the first separator and at least one sidewall of the adjacent battery.

36. The battery pack according to any one of claims 1 to 6, characterized in that, The battery is a prismatic battery, and the casing of the prismatic battery is in the shape of a quadrangular prism. The sidewall includes a first sidewall and a second sidewall arranged adjacent to each other. The area of ​​the first sidewall is larger than the area of ​​the second sidewall. The first sidewall is arranged opposite to the first partition plate.

37. The battery pack according to any one of claims 1 to 6, characterized in that, The battery is a square-shell battery, and the casing of the square-shell battery is in the shape of a quadrangular prism. The sidewall includes a first sidewall and a second sidewall arranged adjacent to each other. The area of ​​the first sidewall is larger than the area of ​​the second sidewall, and the second sidewall is arranged opposite to the first partition plate. The thickness of the first baffle is 0.7 mm to 2 mm.

38. The battery pack according to any one of claims 1 to 6, characterized in that, The battery is a cylindrical battery with a diameter greater than or equal to 30 mm.

39. The battery pack according to claim 38, characterized in that, At least a portion of the batteries in the first battery cell are offset from at least a portion of the batteries in the second battery cell along the second direction.

40. An electrical appliance, characterized in that, include: The battery pack as described in any one of claims 1 to 39.

Images