Battery pack and electric device

Abstract

The invention discloses a battery pack and a power utilization device. The battery pack comprises a battery module, a box body and an end plate assembly, the battery module comprises a plurality of single batteries which are arranged along a second direction; the box body comprises a bottom plate and a cross beam, and the cross beam and the plurality of single batteries are connected to the same side of the bottom plate along a first direction; the end plate assembly is arranged between the single battery and the cross beam in the second direction and comprises a first plate body, a second plate body and a first buffer part, the first plate body abuts against the cross beam, the first buffer part abuts against the portion between the first plate body and the second plate body in the second direction, and the first buffer part is provided with a notch; the notch penetrates through the side, back on to the bottom plate, of the first buffering piece in the first direction. And the colloid is filled in at least part of the notch. According to the battery pack, the end plate assemblies can prevent the single batteries from extruding the cross beams during expansion, and can absorb the expansion force of the single batteries, so that the cycle life of the battery pack is prolonged.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to a battery pack and an electrical device. Background Technology

[0002] The battery module is assembled inside the box, and there is a gap between it and the box. During the use of the battery pack, the individual cells will expand.

[0003] In related technologies, after the battery module is assembled into the casing, adhesive is injected into the gap between the battery module and the casing to fill the gap and absorb assembly tolerances. This can play a certain role in absorbing the expansion of individual cells and transmitting expansion forces. However, relying solely on adhesive is not effective in controlling expansion forces. The difference in force on both sides of the individual cells at the two ends of the battery module leads to reduced consistency of the individual cells, resulting in performance degradation, shortened lifespan, and even safety issues. Summary of the Invention

[0004] This application aims to provide a battery pack and electrical device that at least solves the problem of poor transmission of expansion force.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows: In a first aspect, embodiments of this application propose a battery pack, including a battery module, a housing, and an endplate assembly.

[0006] The battery module includes multiple individual cells arranged along the second direction; the housing includes a base plate and a crossbeam, the crossbeam and the multiple individual cells connected to the same side of the base plate along the first direction; an end plate assembly is disposed between the individual cells and the crossbeam along the second direction, the end plate assembly includes a first plate, a second plate, and a first buffer member, the first plate abutting against the crossbeam, the first buffer member abutting between the first plate and the second plate along the second direction, the first buffer member having a notch, the notch penetrating along the first direction through the side of the first buffer member opposite to the base plate, the notch penetrating along both sides of the first buffer member along the second direction; an adhesive fills the notch, the adhesive connecting the first plate, the first buffer member, and the second plate.

[0007] Secondly, embodiments of this application provide an electrical device including the battery pack described in the above embodiments.

[0008] In the embodiments of this application, the beneficial effects are as follows: by setting an end plate assembly between the crossbeam and the individual battery, wherein the first plate and the second plate can separate the crossbeam and the individual battery, the expansion force of the individual battery can be controlled by combining the colloid and the first buffer, absorbing the expansion force to a certain extent and transferring the remainder to the crossbeam, thus avoiding excessive compression of the crossbeam when the individual battery expands. At the same time, a portion of the interaction force is fed back to the individual battery, thereby reducing the degree of deformation of the individual battery under the action of expansion force and improving the service life of the individual battery.

[0009] Additional aspects and advantages of the invention 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 the invention. Attached Figure Description

[0010] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the battery pack structure according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the battery pack structure according to an embodiment of the present invention; Figure 3 This is a structural schematic diagram of the endplate assembly according to an embodiment of the present invention; Figure 4 This is an exploded view of the endplate assembly according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the battery pack structure according to an embodiment of the present invention; Figure 6 This is a structural schematic diagram of the end plate assembly and the housing according to an embodiment of the present invention; Figure 7 This is a schematic diagram showing the positions of the orthographic projection of the second plate and the orthographic projection of a single cell according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of the electrical device according to an embodiment of the present invention; Figure label: Battery pack 100; Battery module 110; Individual cell 111; Box body 120; bottom plate 121; crossbeam 122; first side wall 1221; second side wall 1222; top surface 1223; first edge 1224; second edge 1225; flow guide 1226; receiving groove 123; End plate assembly 130; First plate 131; Notch 1311; Peripheral edge 1312; Second plate 132; First pressure plate 1321; First plate portion 1322; Second plate portion 1323; Third plate portion 1324; Second pressure plate 1325; First buffer 133; Notch 1331; First buffer portion 1332; Second buffer portion 1333; Second end face 1334; Second buffer 134; First end face 1341; Third buffer 135; Third buffer portion 1351; Cavity 1352; Fourth buffer portion 1353; Colloid 140. Detailed Implementation

[0011] Embodiments of the present invention will now be described in detail. Examples of these embodiments are illustrated 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 the present invention, and should not be construed as limiting the present invention. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0012] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0013] In the description of this invention, it should be understood that 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 invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0014] In the description of this invention, it should be noted that, unless otherwise explicitly 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 of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0015] The following is combined with Figures 1 to 8 A battery pack according to a first aspect embodiment and an electrical device according to a second aspect embodiment are described. It should be noted that the battery pack and the electrical device have a first direction, a second direction, and a third direction, which are perpendicular to each other.

[0016] A first aspect of this application provides a battery pack 100, see reference. Figures 1 to 4 As shown, the battery pack 100 includes a battery module 110, a housing 120, an end plate assembly 130, and a gel 140. The battery module 110 includes multiple individual cells 111, which are arranged along a second direction. Each individual cell 111 has a large surface and small surfaces, where the large surface is the largest surface and the small surface is the smallest surface. For square aluminum-cased batteries or square pouch batteries, the large surface consists of the two largest square surfaces, and the small surface consists of the four smaller narrow side surfaces. For cylindrical batteries, the large surface refers to the curved side surface, and the small surface refers to the two circular planes at the top and bottom. Individual cells 111 are typically arranged with their large surfaces facing each other; in this application, the direction of the large surfaces is the second direction. When an individual cell 111 expands, both the large and small surfaces expand, but the expansion is primarily manifested in the large surfaces. Therefore, in this application, the expansion of the individual cell 111 along the second direction is more pronounced.

[0017] The housing 120 includes a base plate 121 and a crossbeam 122. The crossbeam 122 and the individual battery 111 are connected to the same side of the base plate 121 along a first direction, and the crossbeam 122 and the individual battery 111 are spaced apart along a second direction. An end plate assembly 130 is disposed between the individual battery 111 and the crossbeam 122 along the second direction. The end plate assembly 130 is an elastic structural component. When the individual battery 111 expands during operation, the end plate assembly 130 abuts against the individual battery 111 to absorb the expansion force, thereby preventing the expansion of the individual battery 111 from squeezing the crossbeam 122 and causing damage to the battery module 110. Simultaneously, the end plate assembly 130 provides a certain reaction force to the individual battery 111, preventing excessive expansion and adverse phenomena such as lithium plating. Furthermore, the end plate assembly 130, disposed between the individual battery 111 and the crossbeam 122, can compensate for assembly errors between the individual battery 111 and the crossbeam 122. After the end plate assembly 130 is assembled with the single cell 111 and the crossbeam 122, the end plate assembly 130 will be squeezed by the crossbeam 122 and the single cell 111 along the second direction to improve the assembly compactness of the crossbeam 122 and the battery module 110.

[0018] Specifically, the end plate assembly 130 includes a first plate 131, a second plate 132, and a first buffer member 133. The first plate 131 abuts against the crossbeam 122, and the first buffer member 133 is disposed between the first plate 131 and the second plate 132 along a second direction, and abuts against the first plate 131 and the second plate 132. In this embodiment, the first buffer member 133 is connected to the first plate 131 and the second plate 132 by adhesive bonding. In other embodiments, the first buffer member 133 can also be assembled and fixed to the first plate 131 and the second plate 132 by the compressive force of the single battery 111 and the crossbeam 122. The first buffer member 133 has a notch 1331, which extends along a first direction through one side of the first buffer member 133 facing away from the bottom plate 121, and extends along both sides of the first buffer member 133 along a second direction. The first plate 131 and the second plate 132 cover the two sides of the notch 1331 along the second direction. This causes the first plate 131 and the second plate 132 to block the flow of glue in the second direction when glue is injected into the notch 1331, thereby forming a glue 140 in the first plate 131 and the second plate 132, which is connected to the first plate 131, the second plate 132 and the first buffer 133.

[0019] In this embodiment, the battery pack 100 uses end plate assemblies 130 on the crossbeam 122 and individual cells 111 to separate the crossbeam 122 and individual cells 111, preventing the individual cells 111 from being squeezed by the crossbeam 122 when they expand, thus avoiding damage to the individual cells 111. Simultaneously, the end plate assembly 130 is a deformable structural component made possible by the colloid 140 and the first buffer 133. When the individual cells 111 expand, the end plate assembly 130 deforms under the expansion force, causing the individual cells 111 to press against the second plate 132. The second plate 132 supports the expansion surface of the individual cells 111 during expansion, thereby promoting the expansion stability of the individual cells 111 and balancing the forces on both ends of the individual cells 111.

[0020] During the expansion process, the second plate 132 compresses the colloid 140 and the first buffer 133 to adaptively displace the battery cell 111 while maintaining contact with it. This allows the end plate assembly 130 to deform under the expansion force, thus providing expansion space for the battery cell 111. This avoids the risk of thermal runaway in the battery pack 100 caused by the restriction of the expansion surface of the battery cell 111, which could lead to internal expansion and deformation. Furthermore, the colloid 140 and the first buffer 133 absorb the expansion force of the battery cell 111, preventing excessive expansion that could cause battery casing rupture or electrolyte leakage, thereby improving the service life of the battery cell 111.

[0021] Furthermore, as the single cell 111 completes its expansion and contraction, the colloid 140 and the first buffer 133 exert a pushing force on the second plate 132 as the expanded surface of the single cell 111 contracts, causing the second plate 132 to shift towards the single cell 111. Under the action of the pushing force, the second plate 132 can press against the expanded surface of the single cell 111 to drive the contraction and recovery of the expanded surface, reduce the deformation of the single cell 111 caused by the expansion, and improve the service life of the single cell 111.

[0022] See Figure 4As shown, it can be understood that the second plate 132 includes a first pressing plate 1321 and a second pressing plate 1325 along the second direction. The first pressing plate 1321 abuts against the first buffer member 133 and the second pressing plate 1325, and the colloid 140 is connected to the first pressing plate 1321. In this embodiment, the first pressing plate 1321 is an elastic component. When the single cell 111 expands toward the end plate assembly 130, the second pressing plate 1325 transmits the expansion force to the first pressing plate 1321. After being subjected to force, the first pressing plate 1321 deforms toward the colloid 140 to transmit the expansion force to the colloid 140, thereby improving the transmission efficiency of the expansion force. This allows the colloid 140 and the first buffer member 133 to absorb the expansion force, restricting the expansion deformation of the single cell 111 and further reducing the compression of the crossbeam 122 by the expansion of the single cell 111.

[0023] Furthermore, the first pressure plate 1321 includes a first plate portion 1322 and a second plate portion 1323, which are arranged along a first direction. The second plate portion 1323 is connected to the side of the first plate portion 1322 facing away from the bottom plate 121. Adhesive 140 is connected to the first plate portion 1322 and the second plate portion 1323. In this embodiment, the first plate portion 1322 and the second plate portion 1323 do not completely cover the second pressure plate 1325. That is, along the second direction on a plane perpendicular to the second direction, the projected area of ​​the second plate 132 is greater than the sum of the projected areas of the first plate portion 1322 and the second plate portion 1323. Therefore, the adhesive 140 will extend beyond the first plate portion 1322 and the second plate portion 1323 to connect to the second pressure plate 1325, thereby improving the connection stability of the end plate assembly 130. Along the second direction, on a plane perpendicular to the second direction, the orthographic projection of the second plate portion 1323 covers the center point of the orthographic projection of the single cell 111. The expansion surface of the single cell 111 has a center point (centroid), wherein, if the orthographic projection of the expansion surface is square, the center point is the intersection of the diagonals of the orthographic projection of the expansion surface. If the orthographic projection of the expansion surface is circular, the center point is the center of the circle of the orthographic projection of the expansion surface. When the single cell 111 expands, the expansion force is greater in the central region closer to the center point on the expansion surface of the single cell 111.

[0024] Specifically, along the second direction, on a plane perpendicular to the second direction, the orthographic projection of the second plate portion 1323 covers the central region of the orthographic projection of the single cell 111. The central region is the area on the expanded surface that includes the center point. (See also...) Figure 7As shown, the orthographic projection S1 of the second plate covers the center point O of the orthographic projection S2 of the single cell. The orthographic projection of the second plate has a certain area on the plane perpendicular to the second direction. Thus, the orthographic projection S1 covers a local area around the center point O of the orthographic projection S2. Along the side facing away from the bottom plate in the first direction, the local area is spaced from the edge of the orthographic projection S2. Along the third direction, the local area is spaced from the edge of the orthographic projection S2. It can be understood that the orthographic projection S1 does not cover the entire area of ​​the orthographic projection S2. The local area of ​​the orthographic projection S2, including the center point O, is reflected on the single cell, that is, the central area around the center point of the expansion surface. The central area is spaced from the edges of at least three sides of the expansion surface. As a result, after the single cell 111 generates an expansion force towards the end plate assembly 130, the second plate 1323 can conduct the expansion force generated in the central area, thereby improving the expansion force transmission efficiency and the absorption of the expansion force by the colloid 140 and the first buffer 133, and limiting the expansion deformation of the single cell 111.

[0025] Further, see Figure 3 and Figure 4 As shown, in some technologies, the second pressure plate 1325 further includes two third plate portions 1324, which are disposed on both sides of the second plate portion 1323 along a third direction and are spaced apart along the third direction. The two third plate portions 1324 are connected to the side of the first plate portion 1322 facing away from the bottom plate 121 along a first direction. When the end plate assembly 130 and the single cell 111 abut to limit the expansion of the single cell 111 and absorb the expansion force, the positions of the two third plate portions 1324 and the edges of the single cell 111 correspond to each other along a second direction. That is, along the second direction on a plane perpendicular to the second direction, the orthographic projection of the two third plate portions 1324 will cover the orthographic projection of the single cell 111 on both sides along the third direction, thereby increasing the corresponding area of ​​the first pressure plate 1321 and the single cell 111, so as to improve the transmission efficiency of the first pressure plate 1321 for the expansion force. Furthermore, both the second plate portion 1323 and the third plate portion 1324 are connected to the first plate portion 1322. When the second plate portion 1323 is subjected to the expansion force of the central region of the single cell 111, the second plate portion 1323 can disperse the expansion force to the third plate portions 1324 on both sides through the first plate portion 1322, thereby reducing the stress concentration of the second plate portion 1323. At the same time, the area of ​​the first pressure plate 1321 abutting against the colloid 140 and the first buffer member 133 will also increase, thereby improving the buffering effect of the end plate assembly 130.

[0026] See Figure 4As shown, one possible implementation is that the first buffer 133 includes a first buffer portion 1332 and a plurality of second buffer portions 1333, which are spaced apart along a third direction. The second buffer portions 1333 are connected to the side of the first buffer portion 1332 facing away from the base plate 121 along a first direction. The first buffer portion 1332 and the second buffer portion 1333 together form a notch 1331 for accommodating the colloid 140. The first buffer portion 1332 and the second buffer portion 1333 abut against the first plate 131 and the second plate 132. The number of second buffer portions 1333 can be two, three, four, or other multiple features.

[0027] Specifically, the first buffer 133 includes two second buffer portions 1333, as exemplified. The two second buffer portions 1333 are spaced apart and connected to the first buffer portion 1332 to form a notch 1331. The first plate 131 and the second plate 132 abut against the first buffer portion 1332 and the second buffer portion 1333 along a second direction to cover both sides of the notch 1331 along the second direction. When the colloid 140 fills the notch 1331, the colloid 140 adheres to the first buffer portion 1332, the second buffer portion 1333, the first pressure plate 1321, and the second pressure plate 1325, thereby improving the connection stability of the end plate assembly 130. Furthermore, the first buffer portion 1332 and the second buffer portion 1333 cooperate with the colloid 140 to provide buffering for the expansion of the individual battery cell 111, improving the buffering effect of the end plate assembly 130.

[0028] Further, see 3 and Figure 4 As shown, the end plate assembly 130 further includes a second buffer member 134, which is disposed between the first plate 131 and the second plate 132 along a second direction, and is connected to the first plate 131 and the second plate 132. By providing the second buffer member 134, the area corresponding to the end plate assembly 130 and the individual battery 111 along the second direction can be increased, thereby further improving the buffering effect of the end plate assembly 130 when subjected to the expansion force of the individual battery 111. The second buffer member 134 is disposed between at least two second buffer portions 1333 along a third direction, and the second buffer member 134 and the second buffer portions 1333 are spaced apart along the third direction. When the colloid 140 fills the notch 1331, if the colloid 140 is filled to a high height and contacts the second buffer 134, the second buffer 134 can press against the colloid 140 to prevent it from overflowing the notch 1331. Furthermore, the pressing force of the second buffer 134 can reduce the porosity of the colloid 140 after solidification, thereby improving the compactness and structural strength of the colloid 140 and promoting the absorption of expansion force by the colloid 140 to enhance the buffering effect.

[0029] In some embodiments, when the battery pack 100 further includes a second buffer 134, and the first buffer 133 includes a first buffer portion 1332 and a plurality of second buffer portions 1333, if the second plate 132 includes a first pressing plate 1321 and a second pressing plate 1325, and the first pressing plate 1321 includes a first plate portion 1322, a second plate portion 1323, and a third plate portion 1324, along the second direction, the first buffer portion 1332 is connected to the first plate portion 1322, the second buffer 134 is connected to the second plate portion 1323, and the second buffer portions 1333 are respectively connected to the third plate portion 1324. In this embodiment, the number of second buffer portions 1333 and third plate portions 1324 is the same, and a plurality of second buffer portions 1333 are respectively connected to one third plate portion 1324. This allows the first pressing plate 1321 to disperse and conduct the expansion force to the corresponding absorption portion when conducting the expansion force, thereby improving the absorption efficiency of the end plate assembly 130 for the expansion force.

[0030] See Figure 6 As shown, it can be understood that, along the first direction, the second buffer 134 has a first end face 1341 on the side facing the base plate 121, and the second buffer part 1333 has a second end face 1334 on the side facing away from the base plate 121. The minimum distance between the first end face 1341 and the base plate 121 is defined as L1, and the minimum distance between the second end face 1334 and the base plate 121 is defined as L2, where L1 is less than or equal to L2.

[0031] Specifically, after the first buffer 133 and the second buffer 134 are assembled and fixed between the first plate 131 and the second plate 132, the colloid 140 is then filled into the notch 1331. When L1 is less than or equal to L2, allowing the colloid 140 to be filled, the colloid 140 will first contact the first end face 1341, allowing the first end face 1341 to press against the colloid 140 to prevent it from overflowing from the second end face 1334 into the notch 1331. Furthermore, the pressure of the colloid 140 from the first end face 1341 also improves the compactness of the colloid 140's solidification, thereby increasing the colloid 140's absorption efficiency of expansion force.

[0032] Further, see Figure 3 As shown, in a first direction, the second buffer 134 presses against the side of the colloid 140 facing away from the base plate 121. When the colloid 140 solidifies from a liquid state, pores are generated inside the colloid 140. In one example, by pressing the colloid 140 with the second buffer 134, the contact between the pressed portion of the colloid 140 and air can be reduced, thereby delaying the solidification of the colloid 140, reducing the porosity of the colloid 140, and improving the buffering capacity of the colloid 140.

[0033] Specifically, when the colloid 140 solidifies, the colloid 140 around the notch 1331 solidifies before the colloid 140 inside the notch 1331. The second buffer 134 presses against the colloid 140, creating a recessed portion in the colloid 140. This recessed portion is located on the side of the colloid 140 facing away from the base plate 121 along the first direction, and it is recessed towards the base plate 121. In this embodiment, after the colloid 140 solidifies, the recessed portion makes the colloid 140 as a whole form a "U" shape. The recessed portion is the part of the colloid 140 pressed by the second buffer 134. Due to the pressure and obstruction of the second buffer 134, the colloid 140 in the recessed portion solidifies more slowly than the colloid 140 on the other sides. This allows the unsolidified colloid 140 inside the notch 1331 to flow and fill the pores of the solidified colloid, and to expel air from the pores through the recessed portion, thereby reducing the porosity of the colloid 140 and improving its structural strength and buffering capacity. Furthermore, compared to the air in the colloid 140 being expelled along the first direction from the side of the colloid 140 away from the base plate 121, the pressure exerted by the second buffer member 134 on the colloid 140 causes the venting position to be recessed towards the interior of the colloid, allowing air to escape from the recessed portion, thus shortening the venting path of the gas inside the colloid 140.

[0034] See Figure 5 and Figure 6 As shown, one possible implementation is that the first plate 131 has a notch 1311 on the side facing away from the base plate 121. The notch 1311 is used to drain excess colloid 140 from the notch 1331. Although the colloid 140 is in a solidified state, it will still be fluid under compression. When the single cell 111 colloids against the end plate assembly 130 and compresses it, the colloid 140 may be squeezed out of the notch 1331. By providing the notch 1311, after the colloid 140 is compressed, it will first overflow from the notch 1311 to flow between the end plate assembly 130 and the crossbeam 122, preventing the colloid 140 from entering between the single cell 111 and the end plate assembly 130 and sticking to the end plate assembly 130 and the single cell 111, thus affecting the use of the single cell 111.

[0035] The notch 1311 has a periphery 1312. Along the first direction, the second buffer 134 has a first end face 1341 on the side facing the base plate 121. The minimum distance between the first end face 1341 and the base plate 121 is L1, and the minimum distance between the periphery 1312 and the base plate 121 is L3, where L1 is less than or equal to L3. Before the colloid 140 overflows from the notch 1311, the first end face 1341 presses against the colloid 140 to improve its compactness and block its flow, reducing the possibility of overflow.

[0036] Further, see Figure 2 , Figure 5 and Figure 6 As shown, in some technologies, the crossbeam 122 includes a first sidewall 1221 and a second sidewall 1222, which are spaced apart along a second direction. The first sidewall 1221 abuts against the first plate 131, and the second sidewall 1222 is located on the side of the first sidewall 1221 facing away from the first plate 131. The first sidewall 1221 and the second sidewall 1222 are spaced apart along the second direction to jointly define a receiving groove 123, and a portion of the receiving groove 123 corresponds to the recess 1311 along the second direction. Along the first direction, the side of the second sidewall 1222 facing away from the bottom plate 121 has a top surface 1223, and the maximum distance between the top surface 1223 and the bottom plate 121 is L4, where L4 is less than L3. Since the first sidewall 1221 and the second sidewall 1222 jointly define the receiving groove 123, the first sidewall 1221 and the second sidewall 1222 are the walls of the receiving groove 123 along the second direction. The maximum distance L4 between the top surface 1223 of the second sidewall 1222 and the bottom plate 121 is made less than L3, so that the notch 1311 is located above the receiving groove 123 along the first direction. When the colloid 140 overflows from the notch 1311, since the notch 1311 and part of the receiving groove 123 correspond along the second direction, the colloid 140 will flow from the notch 1311 to the receiving groove 123 to achieve collection.

[0037] Further reading Figure 5 and Figure 6 As shown, it can be understood that the top surface 1223 is inclined relative to the first plate 131. Along the second direction, the top surface 1223 has a first edge 1224 and a second edge 1225 disposed opposite to each other. The second edge 1225 abuts against the first plate 131, and the first edge 1224 is located on the side of the second edge 1225 facing away from the first plate 131. Along the first direction, the maximum distance between the second edge 1225 and the bottom plate 121 is L4, and the maximum distance between the first edge 1224 and the bottom plate 121 is L5. L5 is less than L4, thereby causing the top surface 1223 to be inclined relative to the first plate 131 toward the first sidewall 1221, and the inclination direction is toward the bottom plate 121. That is, if the first direction is from bottom to top and the second direction is from front to back, the top surface 1223 is inclined downward toward the front. When the colloid 140 overflows from the notch 1311, it flows onto the top surface 1223. The inclined design of the top surface 1223 causes the colloid 140 to flow into the receiving groove 123 for collection, thereby improving the collection efficiency of the colloid 140. Therefore, it can be understood that the maximum distance between the second edge 1225 and the bottom plate 121 is the maximum distance between the top surface 1223 and the bottom plate 121.

[0038] See Figure 5As shown, one possible implementation is that the second sidewall 1222 has a flow guide 1226, which is disposed along a first direction on the side of the second sidewall 1222 facing away from the bottom plate 121. Along a second direction, the flow guide 1226 extends through both sides of the second sidewall 1222 and connects to the receiving groove 123. The flow guide 1226 and a portion of the recess 1311 correspond to each other along the second direction. In a specific implementation, along the first direction, the distance between the recess 1311 and the bottom plate 121 is greater than or equal to the distance between the flow guide 1226 and the bottom plate 121. When the end plate assembly 130 is expanded and compressed by the single battery cell 111, the first plate 131 and the second plate 132 will compress the colloid 140 along the second direction. After the colloid 140 is squeezed out of the notch 1331, the colloid 140 will flow out from the notch 1311 and flow to the guide port 1226. Through the guiding effect of the guide port 1226, it will enter the receiving groove 123 for storage, thereby preventing the colloid 140 from overflowing and sticking to other parts, which would affect the normal operation of the battery pack 100.

[0039] See 3 and Figure 4 As shown, the end plate assembly 130 also includes a third buffer 135, which is disposed between the second plate 132 and the battery module 110 along the second direction. The third buffer 135 is connected to the second plate 132 and abuts against the battery module 110. Specifically, when the individual battery 111 expands, the expansion force is conducted to the second plate 132 through the third buffer 135, and then conducted to the colloid 140 and the first buffer 133 for absorption by the second plate 132. In this embodiment, the hardness of the third buffer 135 is less than that of the second plate 132. By setting the third buffer 135, the expansion force of the individual battery 111 can be initially absorbed, and the expansion force can be dispersed circumferentially towards the third buffer 135 before being conducted to the second plate 132. This provides an additional buffer layer for the second plate 132 and reduces the impact force and local stress concentration on the second plate 132 caused by the expansion of the individual battery 111. Furthermore, the third buffer 135 can separate the second plate 132 and the single cell 111, avoiding hard contact and friction between the single cell 111 and the second plate 132.

[0040] Further, see Figure 4As shown, in some technologies, the third buffer 135 includes a third buffer portion 1351 and a fourth buffer portion 1353. The third buffer portion 1351 has a cavity 1352, which connects both sides of the third buffer portion 1351 along a second direction. The fourth buffer portion 1353 is disposed in the cavity 1352. When the individual battery cell 111 expands, the expansion force is greater closer to the center on the expansion surface of the individual battery cell 111. When the third buffer 135 abuts against the battery module 110, the third buffer portion 1351 abuts against the edge portion of the expansion surface of the individual battery cell 111, and the fourth buffer portion 1353 abuts against other portions of the expansion surface of the individual battery cell 111.

[0041] In this embodiment, the expansion force experienced by the fourth buffer portion 1353 is greater than that experienced by the third buffer portion 1351. By separately arranging the third buffer portion 1351 and the fourth buffer portion 1353, when the individual battery 111 expands, the fourth buffer portion 1353 can deform and displace relative to the third buffer portion 1351 to transmit the expansion force to the colloid 140. This reduces the tensile force generated by the deformation of the fourth buffer portion 1353 on the third buffer portion 1351, thereby reducing the overall deformation of the third buffer member 135. Furthermore, due to the expansion force experienced by the three buffer portions, the deformation degree of the third buffer portion 1351 is lower. The third buffer portion 1351 can space the individual battery 111 and the second plate 132, preventing displacement of the individual battery 111 relative to the second plate 132 when it expands, thus ensuring sufficient expansion space for the individual battery 111.

[0042] Furthermore, the cavity 1352 and the notch 1331 correspond at least partially along the second direction, that is, both the cavity 1352 and the notch 1331 have edges. Along the second direction, on a plane perpendicular to the second direction, the orthographic projection area of ​​the edge of the cavity 1352 and the orthographic projection area of ​​the edge of the notch 1331 overlap. This allows the fourth buffer portion 1353 to transfer the expansion force from the single cell 111 to the colloid 140 after being subjected to the expansion force of the single cell 111. This improves the conduction efficiency of the expansion force of the single cell 111 and the absorption rate of the expansion force of the single cell 111 by the end plate assembly 130, further improving the service life of the single cell 111.

[0043] A second aspect of this application provides an electrical device, see [reference] Figures 1 to 8 As shown, the power-consuming device includes the battery pack 100 described in any of the above embodiments. Therefore, the power-consuming device includes all the technical solutions mentioned in the above embodiments with beneficial effects, which will not be repeated here.

[0044] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0045] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery pack (100) having a first direction and a second direction perpendicular to each other, characterized in that, include: The battery module (110) includes a plurality of individual cells (111) arranged along the second direction; The housing (120) includes a base plate (121) and a crossbeam (122), wherein the crossbeam (122) and a plurality of the individual cells (111) are connected to the same side of the base plate (121) along the first direction; An end plate assembly (130) is disposed between the single cell (111) and the crossbeam (122) along the second direction. The end plate assembly (130) includes a first plate (131), a second plate (132), and a first buffer (133). The first plate (131) abuts against the crossbeam (122). Along the second direction, the first buffer (133) abuts between the first plate (131) and the second plate (132). The first buffer (133) has a notch (1331). The notch (1331) extends along the first direction through the side of the first buffer (133) facing away from the bottom plate (121). The colloid (140) fills at least a portion of the notch (1331).

2. The battery pack (100) according to claim 1, characterized in that, The notch (1331) extends through at least one side of the first buffer (133) along the second direction, and the colloid (140) is connected to the first plate (131), the first buffer (133) and the second plate (132).

3. The battery pack (100) according to claim 2, characterized in that, Along the second direction, the second plate (132) includes a first pressing plate (1321) and a second pressing plate (1325), the first pressing plate (1321) abuts against the first buffer (133) and the second pressing plate (1325), and the colloid (140) is connected to the first pressing plate (1321); the first pressing plate (1321) includes a first plate portion (1322) and a second plate portion (1323), the first plate portion (1322) and the second plate portion (1323) are arranged along the first direction, and the second plate portion (1323) is connected to the side of the first plate portion (1322) facing away from the bottom plate (121); along the second direction, on a plane perpendicular to the second direction, the orthographic projection of the second plate portion (1323) covers the center point of the orthographic projection of the single cell (111).

4. The battery pack (100) according to claim 3, characterized in that, The battery pack (100) also has a third direction, which is perpendicular to the first direction and the second direction; The first pressure plate (1321) further includes two third plate portions (1324). Along the third direction, the two third plate portions (1324) are respectively disposed on both sides of the second plate portion (1323), and the third plate portions (1324) and the second plate portion (1323) are spaced apart. Along the first direction, the third plate portion (1324) is connected to the side of the first plate portion (1322) facing away from the bottom plate (121).

5. The battery pack (100) according to claim 2, characterized in that, The battery pack (100) also has a third direction, which is perpendicular to the first direction and the second direction; The first buffer (133) includes a first buffer portion (1332) and a plurality of second buffer portions (1333). The plurality of second buffer portions (1333) are spaced apart along the third direction. The second buffer portions (1333) are connected along the first direction to the side of the first buffer portion (1332) facing away from the bottom plate (121). The first buffer portion (1332) and the second buffer portions (1333) form the notch (1331). Along the second direction, the first buffer portion (1332) and the second buffer portion (1333) abut against the first plate (131) and the second plate (132).

6. The battery pack (100) according to claim 5, characterized in that, The end plate assembly (130) further includes a second buffer (134), which is disposed between the first plate (131) and the second plate (132) along the second direction and connected to the first plate (131) and the second plate (132); along the third direction, the second buffer (134) is spaced between at least two second buffer portions (1333).

7. The battery pack (100) according to claim 6, characterized in that, Along the first direction, the second buffer (134) has a first end face (1341) on the side facing the base plate (121), and the second buffer (1333) has a second end face (1334) on the side facing away from the base plate (121). The minimum distance between the first end face (1341) and the base plate (121) is L1, and the minimum distance between the second end face (1334) and the base plate (121) is L2, wherein L1≤L2.

8. The battery pack (100) according to claim 6, characterized in that, Along the first direction, the second buffer (134) presses against the side of the colloid (140) facing away from the base plate (121).

9. The battery pack (100) according to claim 6, characterized in that, Along the first direction, the first plate (131) has a notch (1311) on the side facing away from the base plate (121), and the second buffer (134) has a first end face (1341) on the side facing the base plate (121). The minimum distance between the first end face (1341) and the base plate (121) is L1. The notch (1311) has a perimeter (1312), and the minimum distance between the perimeter (1312) and the base plate (121) is L3, wherein L1≤L3.

10. The battery pack (100) according to claim 9, wherein the crossbeam (122) includes a first sidewall (1221) and a second sidewall (1222) connected to each other, the first sidewall (1221) and the second sidewall (1222) being spaced apart along the second direction, the second sidewall (1222) abutting against the first plate (131), a receiving groove (123) being provided between the first sidewall (1221) and the second sidewall (1222), a portion of the receiving groove (123) corresponding to the notch (1311) along the second direction; the side of the second sidewall (1222) facing away from the bottom plate (121) has a top surface (1223), the maximum distance between the top surface (1223) and the bottom plate (121) being L4, wherein, L4 < L3.

11. The battery pack (100) according to claim 10, characterized in that, The top surface (1223) is inclined relative to the first plate (131). The top surface (1223) has a first edge (1224) and a second edge (1225) opposite each other. Along the second direction, the second edge (1225) abuts against the first plate (131), and the first edge (1224) is located on the side of the second edge (1225) facing away from the first plate (131). Along the first direction, the maximum distance between the second edge (1225) and the bottom plate (121) is L4, and the maximum distance between the first edge (1224) and the bottom plate (121) is L5, wherein L5 < L4.

12. The battery pack (100) according to claim 10, characterized in that, The second sidewall (1222) has a flow guide (1226). Along the first direction, the flow guide (1226) is located on the side of the second sidewall (1222) facing away from the bottom plate (121). Along the second direction, the flow guide (1226) penetrates the second sidewall (1222) and communicates with the receiving groove (123). The flow guide (1226) corresponds to a portion of the recess (1311).

13. The battery pack (100) according to claim 2, characterized in that, The end plate assembly (130) further includes a third buffer (135), which is disposed between the second plate (132) and the battery module (110) along the second direction. The third buffer (135) is connected to the second plate (132) and abuts against the battery module (110).

14. The battery pack (100) according to claim 13, characterized in that, The third buffer (135) includes a third buffer portion (1351) and a fourth buffer portion (1353). The third buffer portion (1351) has a cavity (1352). The cavity (1352) is connected to both sides of the third buffer portion (1351) along the second direction. The fourth buffer portion (1353) is disposed in the cavity (1352). Along the second direction, on a plane perpendicular to the second direction, the orthographic projection of the cavity wall of the cavity (1352) at least partially overlaps with the orthographic projection of the wall of the notch (1331).

15. An electrical appliance, characterized in that, Includes the battery pack (100) as described in any one of claims 1 to 14.

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