Energy storage device

Abstract

Provided in the present application is an energy storage device, comprising a box (100), an insulating and heat-conducting bracket (200) and a plurality of battery cells (300), wherein the insulating and heat-conducting bracket (200) is fixed in the box (100), and the insulating and heat-conducting bracket (200) is provided with a plurality of first positioning grooves (1001) and second positioning grooves (1002), which are alternately arranged in a first direction; groove bottom surfaces of the first positioning grooves (1001) are higher than those of the second positioning grooves (1002) in a second direction; one battery cell (300) is mounted in each first positioning groove (1001), and one battery cell (300) is mounted in each second positioning groove (1002); and the first direction is perpendicular to the second direction.

Description

Energy storage devices

[0001] This application claims priority to Chinese Patent Application No. 202521050594.7, filed with the Chinese Patent Office on May 26, 2025, the entire contents of which are incorporated herein by reference.

[0002] Technical Field

[0003] This application relates to the field of battery technology, and more specifically to an energy storage device.

[0004] Background Technology

[0005] Lithium-ion battery packs have advantages such as high energy density, long lifespan, and low pollution. They also have a very low self-discharge rate, are lightweight, and easy to use, making them widely used in new energy fields such as electric logistics vehicles, buses, and cars.

[0006] Lithium batteries are a widely used power source. They are typically combined by connecting multiple cells in series and parallel via busbars, depending on the voltage and capacity requirements of the load.

[0007] Technical issues

[0008] All the battery cells are arranged in a close array inside the box, which can easily lead to heat accumulation and, in extreme cases, may cause thermal runaway.

[0009] Technical solutions

[0010] In a first aspect, embodiments of this application provide an energy storage device, including a housing, an insulating and thermally conductive bracket, and a plurality of battery cells. The insulating and thermally conductive bracket is fixed inside the housing. The insulating and thermally conductive bracket has a plurality of alternately arranged first positioning grooves and second positioning grooves along a first direction. Along a second direction, the bottom surface of the first positioning groove is higher than the bottom surface of the second positioning groove. Each first positioning groove contains one battery cell, and each second positioning groove contains one battery cell. The first direction is perpendicular to the second direction.

[0011] Beneficial effects

[0012] This application mounts adjacent battery cells in an alternating vertical arrangement on an insulating heat-conducting bracket, increasing the contact area between the battery cells and the bracket. The heat from the battery cells can be directly dissipated through the bracket, improving the heat dissipation effect and making the temperature distribution within the battery pack more uniform.

[0013] This application provides a first heat dissipation channel between every two adjacent second positioning slots and a second heat dissipation channel between every two adjacent first positioning slots. The heat of the battery cell can be transferred to the corresponding heat dissipation channel through the side walls of the multiple positioning slots of the insulating heat-conducting bracket, shortening the heat transfer path of the battery cell to the heat dissipation channel, reducing the accumulation of heat in the battery cell, making the temperature distribution in the battery pack more uniform, improving the temperature consistency of multiple battery cells, and thus reducing the risk of thermal runaway.

[0014] This application incorporates a heat dissipation hole structure on the casing that can form air convection with multiple heat dissipation channels. This allows the heat from the battery pack inside the casing to be dissipated as quickly as possible through air convection, thereby improving the heat dissipation effect of the battery pack and reducing the risk of thermal runaway.

[0015] Attached Figure Description

[0016] Figure 1 is a schematic diagram of the energy storage device described in an embodiment of this application;

[0017] Figure 2 is an exploded view of the energy storage device described in an embodiment of this application;

[0018] Figure 3 is a side view of the insulating heat-conducting bracket described in an embodiment of this application;

[0019] Figure 4 is an exploded view of the bottom plate, second side plate and hanging lug structure of the box according to an embodiment of this application;

[0020] Figure 5 is a magnified view of part A in Figure 4;

[0021] Figure 6 is a side view of the energy storage device (after removing the casing) according to an embodiment of this application;

[0022] Figure 7 is a schematic diagram of the structure of the bottom bracket according to an embodiment of this application;

[0023] Figure 8 is a magnified view of part B in Figure 7;

[0024] Figure 9 is a schematic diagram of the structure of the battery cell described in an embodiment of this application;

[0025] Figure 10 is a magnified view of part C in Figure 9;

[0026] Figure 11 is a schematic diagram of the structure of two adjacent battery cells connected by a connection terminal and a connection bar according to an embodiment of this application.

[0027] In the picture:

[0028] 100. Cabinet body; 1001. First positioning groove; 1002. Second positioning groove; 1003. First heat dissipation channel; 1004. Second heat dissipation channel; 1005. Heat dissipation hole structure; 110. Cabinet cover; 120. First side panel; 130. Second side panel; 131. Fixing groove; 132. Mounting hole; 140. Cabinet bottom plate; 150. Hanging ear structure; 151. Hanging ear; 152. Connecting shaft; 1521. Guide hole; 153. Spring; 154. Guide rod;

[0029] 200. Insulating heat-conducting bracket; 210. Bottom support; 2101. First bracket groove; 2102. Second bracket groove; 211. Base plate; 212. Support part; 2121. Support plate; 213. Supporting part; 220. Top limiting frame; 2201. First limiting groove; 2202. Second limiting groove; 221. Top plate; 222. Limiting part; 223. Connecting part; 2231. Connecting plate; 224. Limiting block; 230. First connecting column; 240. Second connecting column; 250. Reinforcing member;

[0030] 300, battery cell;

[0031] 400. Locking structure; 410. Fixing component; 4101. First slot; 4102. Second slot; 411. First fixing plate; 412. Second fixing plate; 413. Channel plate; 420. Snap-fit ​​component; 421. Snap-fit ​​body; 422. First snap-fit ​​protrusion; 423. Second snap-fit ​​protrusion;

[0032] 500. Connecting bar; 510. Connecting section; 511. First connecting section; 512. Second connecting section; 520. Welding section;

[0033] 600, Connecting terminal; 6001, Snap-fit ​​groove; 6002, Clearance window; 610, Conductive base; 620, Snap-fit ​​end; 630, Elastic abutment part; 631, First inclined piece; 632, Second inclined piece; 633, Abutment piece.

[0034] Embodiments of the present invention

[0035] As shown in Figures 1 to 3, an embodiment of this application provides an energy storage device, including a housing 100, an insulating and heat-conducting bracket 200, and a plurality of battery cells 300. The insulating and heat-conducting bracket 200 is fixed inside the housing 100. The insulating and heat-conducting bracket 200 has a plurality of alternately arranged first positioning grooves 1001 and second positioning grooves 1002 along a first direction (X direction in the figure). Along a second direction (Z direction in the figure), the bottom surface of the first positioning groove 1001 is higher than the bottom surface of the second positioning groove 1002. Each first positioning groove 1001 is equipped with a battery cell 300, and each second positioning groove 1002 is equipped with a battery cell 300. The first direction is perpendicular to the second direction.

[0036] The battery cell 300 in this embodiment can be a square battery cell 300 or other battery cells 300 with similar structures. Next, the energy storage device of this application will be described using a high energy density battery cell 300 (LF206) as an example.

[0037] In this embodiment, multiple alternating first positioning grooves 1001 and second positioning grooves 1002 are provided along the first direction in the insulating heat-conducting bracket 200, and the height of the first positioning groove 1001 is designed to be higher than the height of the second positioning groove 1002. Through this staggered structure design, the contact area between the battery cell 300 and the insulating heat-conducting bracket 200 can be effectively increased. The heat generated by the battery cell 300 can be diffused out through the insulating heat-conducting bracket 200, improving the heat dissipation effect of the battery cell 300 and making the temperature distribution of the battery pack more uniform.

[0038] The insulating heat-conducting bracket 200 also has a first heat dissipation channel 1003 and a second heat dissipation channel 1004. A first heat dissipation channel 1003 is provided between every two adjacent second positioning slots 1002. The first heat dissipation channel 1003 is located below the first positioning slot 1001. A second heat dissipation channel 1004 is provided between every two adjacent first positioning slots 1001. The second heat dissipation channel 1004 is located above the second positioning slot 1002.

[0039] In this embodiment, a first heat dissipation channel 1003 is provided between every two adjacent second positioning slots 1002, and a second heat dissipation channel 1004 is provided between every two adjacent first positioning slots 1001. The inner walls of the first positioning slots 1001 and the second positioning slots 1002 are in contact with the battery cell 300, and the outer walls of the first positioning slots 1001 and the second positioning slots 1002 are the channel walls of the second heat dissipation channel 1004 and the first heat dissipation channel 1003, respectively. The heat generated by the battery cell 300 can be conducted to the corresponding heat dissipation channel through the side wall of the corresponding positioning slot. Heat is dissipated through the heat dissipation channel, the heat transfer path is short, and the heat dissipation efficiency of the battery cell 300 is effectively improved.

[0040] The first heat dissipation channel 1003 and the second heat dissipation channel 1004 pass through the insulating heat-conducting bracket 200 along the third direction (Y direction in the figure), respectively. The first positioning groove 1001 and the second positioning groove 1002 are open at both ends along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0041] The two ends of the first heat dissipation channel 1003 and the second heat dissipation channel 1004 along the third direction can serve as heat dissipation channel openings. The heat of the battery cell 300 is transferred to the corresponding heat dissipation channel through the insulating thermally conductive bracket 200, and then diffused out through the heat dissipation channel openings. The two ends of the first positioning groove 1001 and the second positioning groove 1002 along the third direction are open, which allows the two sides of the battery cell 300 along the third direction to be exposed, so that the heat is dissipated through contact with the air, avoiding excessive heat concentration and reducing the risk of thermal runaway.

[0042] Considering the installation space inside the housing 100, this embodiment can maximize the height difference between the first positioning groove 1001 and the second positioning groove 1002 when designing the height of the first positioning groove 1001 and the second positioning groove 1002. This reduces the heat accumulated in the groove wall between the first positioning groove 1001 and the second positioning groove 1002, allowing the heat to mainly diffuse through the groove wall into the heat dissipation channel, and quickly dissipate the heat through the heat dissipation channel, thereby improving the heat dissipation effect of the energy storage device.

[0043] The insulating heat-conducting bracket 200 is made of high-strength thermally conductive plastic material. Using the insulating heat-conducting bracket 200 as a heat-conducting medium can shorten the heat transfer distance of the battery cell 300, quickly dissipate the heat generated by the battery cell 300, and exchange heat with the outside through air convection in the heat dissipation channel.

[0044] As shown in Figures 1 and 2, the box body 100 has a box cover 110 and two first box side plates 120 arranged opposite each other along a third direction. The box cover 110 is fixed on the first box side plate 120 and located above the insulating heat-conducting bracket 200. The insulating heat-conducting bracket 200 is located between the two first box side plates 120. At least two of the box cover 110 and the two first box side plates 120 are provided with heat dissipation hole structures 1005 that communicate with the first heat dissipation channel 1003 and the second heat dissipation channel 1004. When the box cover 110 and one of the first box side plates 120 are provided with heat dissipation hole structures 1005, the heat dissipation hole structure 1005 on the box cover 110 is at least adjacent to the other first box side plate 120, and the first direction, the second direction and the third direction are perpendicular to each other.

[0045] In this embodiment, by opening heat dissipation hole structures 1005 in at least two of the three components, namely the box cover 110 and the two first box side plates 120, the heat dissipation hole structures 1005 can be connected with the first heat dissipation channel 1003 and the second heat dissipation channel 1004 to form air convection, and the heat in the first heat dissipation channel 1003 and the second heat dissipation channel 1004 can be quickly dissipated by the flowing air.

[0046] In some embodiments, heat dissipation hole structures 1005 are respectively provided on the two first box side plates 120. One of the first box side plates 120 serves as the front plate of the energy storage device, used for installing interfaces, etc., and the heat dissipation hole structure 1005 is provided near its upper end, facing the second heat dissipation channel 1004. The other first box side plate 120 serves as the rear plate of the energy storage device, and a set of heat dissipation hole structures 1005 is provided near its upper and lower ends, respectively. The heat dissipation hole structure 1005 near the upper end of the first box side plate 120 faces the second heat dissipation channel 1004, and is located near the first box side plate 120. The heat dissipation hole structure 1005 at the lower end of the side plate 120 is directly opposite the first heat dissipation channel 1003, and each group of heat dissipation hole structures 1005 includes multiple groups of sub-heat dissipation hole structures 1005 directly opposite the corresponding heat dissipation channel. Along the first direction, two adjacent groups of sub-heat dissipation hole structures 1005 are spaced apart, and each group of sub-heat dissipation hole structures 1005 includes multiple spaced heat dissipation holes. The heat dissipation hole structures 1005 on the two first box side plates 120 are connected to the first heat dissipation channel 1003 and the second heat dissipation channel 1004. When ventilating, air convection will be generated to dissipate heat from the battery cell 300.

[0047] In some embodiments, the lid 110 and the two first side panels 120 are respectively provided with heat dissipation hole structures 1005. The heat dissipation hole structures 1005 on the lid 110 are disposed adjacent to the first side panel 120, which serves as the front panel, to improve air convection. Of course, the heat dissipation hole structures 1005 can also be disposed adjacent to the first side panel 120, which serves as the rear panel, on the lid 110.

[0048] In other embodiments, heat dissipation hole structures 1005 may be provided only on the cover 110 and one of the first side panels 120. The heat dissipation hole structures 1005 on the cover 110 are provided adjacent to the other first side panel 120. This structural design can also form air convection to dissipate heat from the battery cell 300.

[0049] In this embodiment, each group of heat dissipation hole structures 1005 includes multiple heat dissipation holes arranged at intervals.

[0050] In this embodiment, the energy storage device directly eliminates the need for related sheet metal parts such as module end plates. The battery cells 300 are arranged in an interlaced pattern, which increases the contact area between each battery cell 300 and the side wall of the heat dissipation channel. At the same time, the heat dissipation hole structure 1005 on the front and rear first box side plates 120 and box cover 110 forms multiple heat dissipation paths with multiple heat dissipation channels, which greatly improves the heat exchange efficiency between the battery cells 300 and the outside world.

[0051] The housing 100 has two second side panels 130 arranged opposite each other along a first direction. The two ends of the second side panels 130 along a third direction are fixedly connected to the two ends of the first side panel 120 along the first direction, as shown in Figures 2, 4 and 5. The two second side panels 130 are respectively provided with fixing grooves 131 on opposite sides. The fixing grooves 131 have two groove walls along a second direction. The two groove walls are provided with mounting holes 132 facing each other along the second direction. The housing 100 also includes a hanging ear structure 150. The hanging ear structure 150 includes an elastic guide part, two hanging ears 151 and two connecting shafts 152. Each hanging ear 151 is connected to a connecting shaft 152. The connecting shafts 152 are inserted into the corresponding mounting holes 132. The ends of the two connecting shafts 152 away from the mounting holes 132 are connected through the elastic guide part. The elastic guide part ensures that the two connecting shafts 152 are always inserted into the corresponding mounting holes 132.

[0052] Two lugs 151 are spaced apart along the second direction. Each lug 151 is fixedly connected to a connecting shaft 152 on one side along the horizontal direction. The upper end of the connecting shaft 152 connected to the upper lug 151 protrudes from the lug 151 and is inserted into the mounting hole 132 in the upper groove wall. The lower end of the connecting shaft 152 connected to the lower lug 151 protrudes from the lug 151 and is inserted into the mounting hole 132 in the lower groove wall. The opposite ends of the two connecting shafts 152 are connected by an elastic guide. During installation, the two connecting shafts 152 can be smoothly inserted into the corresponding mounting holes 132 by the guidance and elastic pressure of the elastic guide.

[0053] The elastic guide includes a spring 153 and a guide rod 154. One end of a connecting shaft 152 facing the other connecting shaft 152 has a guide hole 1521. The guide rod 154 is fixed to the end of the other connecting shaft 152 and is inserted into the guide hole 1521. The spring 153 is sleeved on the outer circumference of the guide rod 154. One end of the spring 153 is located inside the guide hole 1521 and abuts against the guide hole 1521, while the other end of the spring 153 abuts against the end face of the connecting shaft 152 to which the guide rod 154 is fixed. Through the cooperation of the spring 153 and the guide rod 154, the two connecting shafts 152 are fixed in the fixing groove 131.

[0054] For example, as shown in Figure 5, the two lugs 151 are the first lug and the second lug, with the first lug located above the second lug. The two connecting shafts 152 are the first connecting shaft and the second connecting shaft, respectively. The first connecting shaft is fixedly connected to the first lug, and the second connecting shaft is fixedly connected to the second lug. A guide rod 154 is fixed to the upper end of the second connecting shaft. A guide hole 1521 is provided at the lower end of the first connecting shaft, and the guide rod 154 is inserted into the guide hole 1521. A spring 153 is sleeved on the guide rod 154, with its upper end abutting against the top wall of the guide hole 1521 and its lower end abutting against the upper end of the second connecting shaft. The guide hole 1521 is a blind hole.

[0055] In this embodiment, the connecting shaft 152 connected to the hanging ear 151 can rotate freely 180° within the corresponding mounting hole 132, which facilitates product packaging and transportation.

[0056] In this embodiment, the box body 100 is made of aluminum, as shown in Figures 1 and 2. The box body 100 also includes a bottom plate 140, an insulating heat-conducting bracket 200 fixed on the bottom plate 140, two second side plates 130 integrally stamped with the bottom plate 140, two first side plates 120 fixedly connected with the second side plates 130, and the box cover 110 abuts against the first side plates 120 and the second side plates 130 around its perimeter. The box cover 110 is limited by the fixing of the first side plates 120 and the second side plates 130, eliminating the need for fasteners to fix the box cover 110 and eliminating the risk of fatigue failure.

[0057] As shown in Figure 3, the insulating heat-conducting bracket 200 includes a bottom support 210 and a top limiting bracket 220 detachably mounted on the bottom support 210. The bottom support 210 has a plurality of alternating first grooves 2101 and second grooves 2102 along a first direction. The bottom surface of the first groove 2101 is higher than the bottom surface of the second groove 2102. The top limiting bracket 220 has a plurality of alternating first limiting grooves 2201 and second limiting grooves 2202 along the first direction. The opening of the first limiting groove 2201 faces the opening of the first support groove 2101, and the opening of the second limiting groove 2202 faces the opening of the second support groove 2102. The first support groove 2101 and the first limiting groove 2201 constitute the first positioning groove 1001, and the second support groove 2102 and the second limiting groove 2202 constitute the second positioning groove 1002. The first heat dissipation channel 1003 is located below the first support groove 2101, and the second heat dissipation channel 1004 is located above the second limiting groove 2202.

[0058] In this embodiment, the insulating heat-conducting bracket 200 is composed of a bottom support 210 and a top limiting bracket 220, and the bottom support 210 and the top limiting bracket 220 are detachably connected. The first positioning groove 1001 for installing the battery cell 300 is composed of a first support groove 2101 and a first limiting groove 2201, and the second positioning groove 1002 is composed of a second support groove 2102 and a second limiting groove 2202. When installing the battery cell 300, the battery cell 300 is placed on the first support groove 2101 and the second support groove 2102, and then the top limiting bracket 220 is fixed on the bottom support 210. The battery cell 300 is limited by the contact between the corresponding first limiting groove 2201 and the second limiting groove 2202. The battery cell 300 is installed quickly and stably.

[0059] For example, as shown in Figure 2, the bottom bracket 210 has a plurality of first connecting posts 230 protruding from both sides along the first direction, and all the first connecting posts 230 are spaced apart along the second direction; the top limiting frame 220 has a plurality of second connecting posts 240 on both sides along the first direction, and all the second connecting posts 240 are spaced apart along the third direction. The first connecting posts 230 and the second connecting posts 240 correspond one to one and are connected by screws, thereby realizing the fixed connection between the bottom bracket 210 and the top limiting frame 220.

[0060] As shown in Figure 3, the bottom support 210 in this embodiment includes a base plate 211, a support portion 212, and a support portion 213. Multiple support portions 212 are spaced apart along a first direction. Each support portion 212 includes two support plates 2121 fixed to the base plate 211 at intervals along the first direction. The support portion 213 is connected to a support plate 2121 on each side along the first direction. The upper end of the support plate 2121 protrudes from the support portion 213 to form a first groove 2101. That is, the support portion 213 and the support plates 2121 on both sides form the first groove 2101. The support portion 213 and the base plate 211 are spaced apart along a second direction. The support portion 213, the base plate 211, and the two corresponding support plates 2121 surround a first heat dissipation channel 1003. A second groove 2102 is formed between the base plate 211 and every two adjacent support portions 213.

[0061] The first tray 2101 is used to support the battery cell 300, and the support plate 2121 is used to limit the battery cell 300 on both sides and relatively lower in the first direction, so that the battery cell 300 can be limited in both the third direction and the first direction.

[0062] In some other embodiments, the top limiting frame 220 includes a top plate 221, a limiting part 222, and a connecting part 223. A plurality of connecting parts 223 are spaced apart along a first direction. Each connecting part 223 includes two connecting plates 2231 fixedly below the top plate 221 at a distance along the first direction. The limiting part 222 is connected to a connecting plate 2231 on each side along the first direction. The lower end of the connecting plate 2231 protrudes from the limiting part 222 to form a second limiting groove 2202. The limiting part 222 and the top plate 221 are spaced apart along a second direction. The limiting part 222, the top plate 221, and the two corresponding connecting plates 2231 surround a second heat dissipation channel 1004.

[0063] In this embodiment, the second support 2102 is used to support the battery cell 300, the limiting part 222 is used to abut against the top surface of the battery cell 300, and the connecting plate 2231 is used to limit the battery cell 300 on both sides and relatively above along the first direction.

[0064] The first slot 2101 of the bottom bracket 210 and the first limiting slot 2201 of the top limiting bracket 220 cooperate to form a first positioning slot 1001 for positioning and installing the battery cell 300. The second slot 2102 of the bottom bracket 210 and the second limiting slot 2202 of the top limiting bracket 220 cooperate to form a second positioning slot 1002 for positioning and installing the battery cell 300. Thus, the battery cell 300 can be limited in both the second and first directions, resulting in high assembly efficiency of the battery cell 300.

[0065] To improve the structural stability of the multiple insulating heat-conducting brackets 200, this embodiment also adds multiple sets of reinforcing members 250. Each heat dissipation channel has one set of reinforcing members 250, and each set of reinforcing members 250 includes two ribs. Taking the first heat dissipation channel 1003 as an example, the two ribs are respectively inclined and set at an angle between them. A support plate 2121 is connected to each side of the two ribs along the first direction. By using the inclined ribs, the structural stability of the support part 212 and the connecting part 223 can be improved, thereby improving the installation stability of the battery cell 300.

[0066] As shown in Figure 6, the energy storage device in this embodiment also includes a locking structure 400. Each battery cell 300 is detachably mounted on the insulating heat-conducting bracket 200 at both ends along a third direction via a set of locking structures 400. The first direction, the second direction, and the third direction are perpendicular to each other. After the battery cell 300 is positioned in the corresponding positioning groove, it is locked and fixed to the insulating heat-conducting bracket 200 by the locking structure 400. The detachable structure design improves the convenience of assembling and disassembling the battery cell 300.

[0067] As shown in Figure 6, each locking structure 400 includes a fixing member 410 and a snap-fit ​​member 420. The fixing member 410 is fixed to one side of the insulating heat-conducting bracket 200 along the third direction. The fixing member 410 has multiple slots with different orientations of the slot openings. The snap-fit ​​member 420 is fixed to one side of the battery cell 300 along the third direction. The snap-fit ​​member 420 has multiple snap-fit ​​protrusions, which are snap-fitted one-to-one with the slots.

[0068] In this embodiment, by placing the fixing member 410 on one side of the insulating heat-conducting bracket 200 along a third direction and placing the snap-fit ​​member 420 on the battery cell 300 at a position corresponding to the fixing member 410, the battery cell 300 can be detachably installed on the insulating heat-conducting bracket 200 through the snap-fit ​​of the snap-fit ​​member 420 and the fixing member 410. Since the fixing member 410 has multiple slots with different orientations, when the snap-fit ​​protrusions on the snap-fit ​​member 420 are snapped into the multiple slots one by one, the snap-fit ​​stability between the fixing member 410 and the snap-fit ​​member 420 can be improved, resulting in high installation stability of the battery cell 300.

[0069] Each of the first trays 2101 and second trays 2102 in the bottom bracket 210 has a fixing member 410 at both ends along the third direction and adjacent to the bottom of the tray. Correspondingly, each of the two sides of the battery cell 300 along the third direction and adjacent to the bottom surface of the battery cell 300 has a snap-fit ​​member 420. The snap-fit ​​member 420 engages with the fixing member 410 to limit the bottom area of ​​the battery cell 300. The first limiting groove 2201 and the second limiting groove 2202 in the top limiting bracket 220 have a limiting block 224 at both ends along the third direction and adjacent to the bottom of the tray. The limiting block 224 limits the top area of ​​the battery cell 300.

[0070] Referring to Figures 7 to 10, the fastener 410 includes a first fixing plate 411, a second fixing plate 412, and a grooved plate 413 protruding from one end of the insulating heat-conducting bracket 200 along a third direction. The first fixing plate 411 is positioned above the second fixing plate 412, and a first slot 4101 is formed between the first fixing plate 411 and the second fixing plate 412. The first slot 4101 has a through slot along a third direction. The grooved plate 413 protrudes from the side of the second fixing plate 412 away from the insulating heat-conducting bracket 200, and a second slot 4102 is formed between the grooved plate 413 and the second fixing plate 412. 02 has a slot extending through in the second direction; the snap-fit ​​component 420 includes a snap-fit ​​body 421, a first snap-fit ​​protrusion 422 and a second snap-fit ​​protrusion 423. The snap-fit ​​body 421 is spaced apart on one side of the battery cell 300 along the third direction. The first snap-fit ​​protrusion 422 protrudes from the snap-fit ​​body 421 on the side facing the battery cell 300. The second snap-fit ​​protrusion 423 protrudes from the snap-fit ​​body 421 on the side away from the battery cell 300. The second snap-fit ​​protrusion 423 is spaced apart below the first snap-fit ​​protrusion 422. The first snap-fit ​​protrusion 422 snaps into the first slot 4101, and the second snap-fit ​​protrusion 423 snaps into the second slot 4102.

[0071] In this embodiment, the first snap-fit ​​protrusion 422 and the second snap-fit ​​protrusion 423 are located on opposite sides of the snap-fit ​​body 421, respectively snapping into the corresponding slots, resulting in high connection stability. As shown in Figure 10, the lower ends of the first snap-fit ​​protrusion 422 and the second snap-fit ​​protrusion 423 are respectively provided with guide slopes. The guide slopes allow the first snap-fit ​​protrusion 422 to be smoothly inserted into the first slot 4101 and the second snap-fit ​​protrusion 423 to be smoothly inserted into the second slot 4102. After the first snap-fit ​​protrusion 422 is inserted into the first slot 4101, the upper surface of the first snap-fit ​​protrusion 422 abuts against the lower surface of the first fixing plate 411; the second snap-fit ​​protrusion 423 directly passes through the second slot 4102 until the upper surface of the second snap-fit ​​protrusion 423 abuts against the lower surface of the groove plate 413.

[0072] In this embodiment, the snap-fit ​​body 421 of the snap-fit ​​component 420 has a Y-shaped structure. Through the cooperation of the fastener 410 and the snap-fit ​​component 420, the battery cell 300 can be quickly installed.

[0073] Referring to Figures 10 and 11, the energy storage device also includes a connecting strip 500 and connecting terminals 600. Connecting terminals 600 are fixed to the side of the cell 300 along a third direction and are electrically connected to the terminal post (not shown) of the cell 300. The connecting strip 500 is snapped into and welded to the connecting terminals 600. The first, second, and third directions are perpendicular to each other. All the cells 300 are connected to each other via connecting terminals 600 and connecting strip 500 to form a battery pack.

[0074] When connecting the connecting strip 500 to the connecting terminal 600, auxiliary tooling is generally used to press the connecting strip 500 against the connecting terminal 600 before welding to ensure welding quality. In this embodiment, a connecting terminal 600 electrically connected to each terminal of the battery cell 300 is provided on the side of the battery cell 300. The connecting strip 500 and the connecting terminal 600 are snapped together before welding, eliminating the need for auxiliary tooling and improving welding quality and efficiency. Furthermore, the snap-fit ​​connection between the connecting strip 500 and the connecting terminal 600 also improves the welding stability between them.

[0075] The connecting terminal 600 includes a conductive base 610, a snap-fit ​​end 620, and an elastic abutment portion 630. The conductive base 610 is fixed to one side of the battery cell 300 along a third direction and is electrically connected to the terminal post of the battery cell 300. The snap-fit ​​end 620 is fixed on the conductive base 610, and a snap-fit ​​groove 6001 is formed between the snap-fit ​​end 620 and the conductive base 610. The snap-fit ​​groove 6001 has a through hole through which the connecting strip 500 can pass. The snap-fit ​​groove 6001 has an elastic abutment portion 630 protruding from at least the groove wall of the conductive base 610. The elastic abutment portion 630 can press the connecting strip 500 inserted into the snap-fit ​​groove 6001 against the conductive base 610. Part of the connecting strip 500 is exposed outside the snap-fit ​​end 620 and is welded to the conductive base 610.

[0076] After one end of the connecting strip 500 passes through the through hole of the snap-fit ​​end 620, the snap-fit ​​groove 6001 of the snap-fit ​​end 620 is provided with an elastic abutment part 630 on the groove wall of the conductive seat 610. The elastic abutment part 630 abuts against the connecting strip 500, thereby pressing the connecting strip 500 against the conductive seat 610. Without the need for auxiliary tooling, the connecting strip 500 can be stably welded to the conductive seat 610.

[0077] In other embodiments, each of the two opposite groove walls of the snap-fit ​​groove 6001 is also provided with an elastic abutment portion 630, which can abut and limit the two sides of the connecting strip 500 in the width direction to prevent the connecting strip 500 from shaking along its width direction and affecting the welding quality. The opening of the clearance window 6002 can provide deformation space when the elastic abutment portion 630 presses against the connecting strip 500.

[0078] For example, the snap-fit ​​groove 6001 has a clearance window 6002 penetrating through the groove wall of the elastic abutment portion 630, as shown in FIG10. The elastic abutment portion 630 includes a first inclined piece 631, a second inclined piece 632, and an abutment piece 633 parallel to the corresponding groove wall. The first inclined piece 631 and the second inclined piece 632 are connected by the abutment piece 633, and the three form a groove-shaped structure. The groove opening of the groove-shaped structure faces the corresponding clearance window 6002. The end of the first inclined piece 631 away from the abutment piece 633 is connected to the groove wall. In other embodiments, the side wall connection of the avoidance window 6002 can also be such that the end of the second inclined plate 632 away from the abutment plate 633 is connected to the side wall of the avoidance window 6002. With this structural design, the connecting strip 500 can be smoothly inserted into the corresponding snap-fit ​​groove 6001 along the first inclined plate 631 and abut against the abutment plates 633 of the multiple elastic abutment parts 630. When it is necessary to remove the connecting strip 500, the connecting strip 500 can be smoothly removed from the snap-fit ​​groove 6001 along the second inclined plate 632.

[0079] The through hole passes through the snap-fit ​​end 620 along the second direction. The connection terminals 600 on the same side of two adjacent cells 300 are staggered vertically. Correspondingly, the connection bar 500 has a connection section 510 and two welding sections 520. The two welding sections 520 are spaced apart along the first direction and snap-fit ​​and welded to one of the connection terminals 600 respectively. The connection section 510 is L-shaped and is formed by connecting the first connection section 511 and the second connection section 512. The length of the first connection section 511 extends along the second direction. The first connection section 511 has a wave-like meandering structure. This structure allows the two welding sections 520 of the connection bar 500 to pass smoothly through the snap-fit ​​groove 6001 of the corresponding connection terminal 600.

Claims

1. An energy storage device, comprising a housing, an insulating and thermally conductive bracket, and a plurality of battery cells, wherein the insulating and thermally conductive bracket is fixed within the housing, and the insulating and thermally conductive bracket has a plurality of alternately arranged first positioning grooves and second positioning grooves along a first direction, wherein the bottom surface of the first positioning groove is higher than the bottom surface of the second positioning groove along a second direction, wherein one battery cell is installed in each first positioning groove, and one battery cell is installed in each second positioning groove, wherein the first direction is perpendicular to the second direction.

2. The energy storage device of claim 1, wherein, The insulating heat-conducting bracket also has a first heat dissipation channel and a second heat dissipation channel. A first heat dissipation channel is provided between every two adjacent second positioning slots. The first heat dissipation channel is located below the first positioning slot. A second heat dissipation channel is provided between every two adjacent first positioning slots. The second heat dissipation channel is located above the second positioning slot.

3. The energy storage device of claim 2, wherein, The first heat dissipation channel and the second heat dissipation channel respectively penetrate the insulating heat-conducting bracket along a third direction. The two ends of the first positioning groove and the second positioning groove along the third direction are open. The first direction, the second direction and the third direction are perpendicular to each other.

4. The energy storage device of claim 2, wherein, The enclosure has a lid and two first side panels arranged opposite each other along a third direction. The lid is fixed to the first side panels and located above the insulating heat-conducting bracket. The insulating heat-conducting bracket is located between the two first side panels. At least two of the lid and the two first side panels have heat dissipation holes that communicate with the first heat dissipation channel and the second heat dissipation channel. When the lid and one of the first side panels have the heat dissipation holes, the heat dissipation holes on the lid are at least adjacent to the other first side panel. The first direction, the second direction, and the third direction are perpendicular to each other.

5. The energy storage device of claim 4, wherein, The box body has two second box side plates arranged opposite each other along the first direction. The two ends of the second box side plates along the third direction are fixedly connected to the two ends of the first box side plates along the first direction. The two second box side plates are respectively provided with fixing grooves on opposite sides. The fixing grooves have two groove walls along the second direction, and the two groove walls are provided with mounting holes facing each other along the second direction.

6. The energy storage device of claim 5, wherein, The housing also includes a hanging ear structure, which includes an elastic guide, two hanging ears, and two connecting shafts. Each hanging ear is connected to one connecting shaft, and the connecting shaft is inserted into the corresponding mounting hole. The ends of the two connecting shafts away from the mounting hole are connected through the elastic guide, which ensures that the two connecting shafts are always inserted into the corresponding mounting hole.

7. The energy storage device of claim 2, wherein, The insulating heat-conducting bracket includes a bottom support and a top limiting bracket detachably mounted on the bottom support. The bottom support has a plurality of alternating first and second slots along the first direction. The bottom surface of the first slot is higher than the bottom surface of the second slot. The top support has a plurality of alternating first and second limiting slots along the first direction. The opening of the first limiting slot faces the opening of the first slot, and the opening of the second limiting slot faces the opening of the second slot. The first slot and the first limiting slot constitute the first positioning slot, and the second slot and the second limiting slot constitute the second positioning slot. The first heat dissipation channel is located below the first slot, and the second heat dissipation channel is located above the second limiting slot.

8. The energy storage device of claim 7, wherein, The bottom support includes a base plate, a support portion, and a support portion. Multiple support portions are spaced apart along a first direction. Each support portion includes two support plates fixed to the base plate at intervals along the first direction. A support plate is connected to each side of the support portion along the first direction. The upper end of each support plate protrudes from the support portion to form a first groove. The support portion and the base plate are spaced apart along a second direction. The support portion, the base plate, and the corresponding two support plates form a first heat dissipation channel. A second groove is formed between the base plate and every two adjacent support portions; and / or, The top limiting frame includes a top plate, a limiting part, and a connecting part. A plurality of the connecting parts are spaced apart along the first direction. Each connecting part includes two connecting plates fixed below the top plate at a distance along the first direction. The limiting part is connected to one of the connecting plates on each side along the first direction. The lower end of the connecting plate protrudes from the limiting part to form a second limiting groove. The limiting part and the top plate are spaced apart along the second direction. The limiting part, the top plate, and the corresponding two connecting plates form a second heat dissipation channel.

9. The energy storage device according to any one of claims 1 to 8 further includes a locking structure, wherein each of the battery cells is detachably mounted on the insulating thermally conductive bracket at both ends along a third direction via a set of the locking structures, wherein the first direction, the second direction, and the third direction are perpendicular to each other.

10. The energy storage device of claim 9, wherein, Each locking structure includes a fixing member and a snap-fit ​​member. The fixing member is fixed to one side of the insulating heat-conducting bracket along the third direction. The fixing member has multiple slots with different orientations of the slot openings. The snap-fit ​​member is fixed to one side of the battery cell along the third direction. The snap-fit ​​member has multiple snap-fit ​​protrusions, which snap-fit ​​one-to-one with the slots.

11. The energy storage device of claim 10, wherein, The fixing member includes a first fixing plate, a second fixing plate, and a groove plate protruding from one end of the insulating heat-conducting bracket along the third direction. The first fixing plate is spaced above the second fixing plate, and a first slot is formed between the first fixing plate and the second fixing plate. The first slot has a through slot along the third direction. The groove plate protrudes from the side of the second fixing plate away from the insulating heat-conducting bracket, and a second slot is formed between the groove plate and the second fixing plate. The second slot has a through slot along a second direction. The snap-fit ​​member includes a snap-fit ​​body, a first snap-fit ​​protrusion, and a second snap-fit ​​protrusion. The snap-fit ​​body is spaced apart on one side of the battery cell along the third direction. The first snap-fit ​​protrusion protrudes from the side of the snap-fit ​​body facing the battery cell, and the second snap-fit ​​protrusion protrudes from the side of the snap-fit ​​body away from the battery cell. The second snap-fit ​​protrusion is spaced apart below the first snap-fit ​​protrusion. The first snap-fit ​​protrusion snaps into the first slot, and the second snap-fit ​​protrusion snaps into the second slot.

12. The energy storage device according to any one of claims 1 to 8 further includes a connecting bar and a connecting terminal, the connecting terminal being fixed to the side of the battery cell along a third direction, the connecting terminal being electrically connected to the electrode post of the battery cell, the connecting bar being snapped into and welded to the connecting terminal, and the first direction, the second direction and the third direction being perpendicular to each other.

13. The energy storage device of claim 12, wherein, The connection terminal includes a conductive base, a snap-fit ​​end, and an elastic abutment. The conductive base is fixed to one side of the battery cell along the third direction and is electrically connected to the terminal of the battery cell. The snap-fit ​​end is fixed to the conductive base, and a snap-fit ​​groove is formed between the snap-fit ​​end and the conductive base. The snap-fit ​​groove has a through hole through which the connection bar can pass. The elastic abutment is provided at least directly opposite the groove wall of the conductive base. The elastic abutment can press the connection bar inserted into the snap-fit ​​groove against the conductive base. The connection bar is partially exposed at the snap-fit ​​end and welded to the conductive base.

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