Battery pack and energy storage device

Abstract

The utility model belongs to the technical field of energy storage power supplies, and discloses a battery pack and an energy storage device, a battery comprises a battery main body and at least two positioning pieces, the battery main body comprises an upper end face, a lower end face and positioning holes, and the positioning holes comprise a first positioning hole formed in the upper end face and / or a second positioning hole formed in the lower end face; the positioning piece is provided with a first connecting part and a second connecting part, the first connecting part can be mounted in the first positioning hole, the second connecting part can be matched with the second positioning hole in an inserting manner, and the battery main body is connected with other battery main bodies through the inserting matching of the positioning hole and the positioning piece. By arranging the positioning holes and the positioning pieces, the battery pack stacking steps are few, the operation is simple, on one hand, the installation time of the energy storage device can be saved, and the assembly efficiency is improved; on the other hand, protruding structures and groove structures on the upper side and the lower side of a traditional battery pack can be omitted, the mold opening cost is reduced, and the appearance attractiveness is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage power supplies, and in particular to a battery pack and an energy storage device. Background Art

[0002] Existing energy storage devices are typically formed by stacking multiple battery packs. The stacking of battery packs mainly involves two methods: positioning with a concave-convex structure on the outer mold of the battery pack and fixing with sheet metal screws. However, fixing with sheet metal screws requires first installing the sheet metal, then aligning the sheet metal of the upper and lower battery packs, and then fixing the sheet metal with screws. This operation is cumbersome and time-consuming, affecting the assembly efficiency of the device. Using a concave-convex structure to position the battery pack requires careful design and processing of the protruding structures and groove structures on the upper and lower sides of the battery pack to ensure the fit and stability after stacking. This leads to high cost and unsightly appearance of the battery pack.

[0003] Therefore, there is an urgent need for a battery pack and an energy storage device to solve at least one of the above technical problems. Utility Model Content

[0004] One purpose of the present invention is to provide a battery pack that can quickly position and stack battery packs, simplify installation steps, save time, and improve assembly efficiency.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] A battery pack includes a battery body and a positioning member, wherein the battery body includes an upper end face, a lower end face and a positioning hole, and the positioning hole includes a first positioning hole arranged on the upper end face and / or a second positioning hole arranged on the lower end face; the positioning member is provided with a first connecting portion and a second connecting portion, the first connecting portion can be installed in the first positioning hole, and the second connecting portion can be plugged into and fitted with the second positioning hole; wherein the battery body is connected to other battery bodies through the plug-in fit of the positioning member through the positioning hole.

[0007] Preferably, the inner diameter of the first positioning hole is smaller than the inner diameter of the second positioning hole.

[0008] Preferably, the positioning member further includes a locking block connected to the second connecting portion, and the locking block is configured to limit the battery body that cooperates with the second connecting portion in the vertical direction after the second connecting portion is inserted into the second positioning hole.

[0009] Preferably, the second connecting portion is provided with an inner cavity and an outlet connected to the inner cavity, an elastic member is provided in the inner cavity, the locking block is connected to the elastic member and is arranged at the end of the elastic member facing the outlet, and the locking block enters and exits the inner cavity through the outlet.

[0010] Preferably, the locking block is provided with a limiting portion and a first guide portion, the limiting portion is in limiting abutment with the inner wall of the second connecting portion, the locking block passes through the outlet at one end away from the elastic member, and the first guide portion is used to guide the locking block into the second positioning hole.

[0011] Preferably, there are two locking blocks, which are respectively connected to the two ends of the elastic member, and the outlets are arranged in a one-to-one correspondence with the locking blocks.

[0012] Preferably, the locking block is provided with a positioning groove, and the end portion of the elastic member is accommodated in the positioning groove and abuts against the bottom wall of the positioning groove.

[0013] Preferably, the top end of the second connecting portion is provided with an operating groove for cooperating with an external bit.

[0014] Preferably, a second guide portion is provided at one end of the positioning member, and the second guide portion is used to guide the second connecting portion into the second positioning hole; and / or a third guide portion is provided at the other end of the positioning member, and the third guide portion is used to guide the first connecting portion into the first positioning hole.

[0015] Another object of the present invention is to provide an energy storage device that can quickly position and stack battery packs, simplify installation steps, save time, and improve assembly efficiency.

[0016] To achieve this purpose, the present invention adopts the following technical solution: an energy storage device, including a base, an inverter and the above-mentioned battery pack, the inverter, the battery pack and the base are stacked in sequence from top to bottom through the positioning member, and the two adjacent ones of the inverter, the battery pack and the base are detachably connected through the cooperation of the positioning member and the positioning hole.

[0017] Beneficial effects of the utility model:

[0018] The utility model provides a battery pack that, by providing positioning holes and positioning members, allows users to quickly stack the battery packs by first installing the positioning member into the first positioning hole on the upper end face of the lower battery body. The user then aligns the second positioning hole on the lower end face of the upper battery body with the positioning member and inserts the positioning member into the second positioning hole. This allows for quick stacking and installation of the battery packs. The battery pack stacking process requires few steps and is simple to operate. This not only reduces installation time for energy storage devices and improves assembly efficiency, but also eliminates the protruding and recessed structures on the upper and lower sides of conventional battery packs, reducing mold costs and improving the aesthetics of the design.

[0019] The utility model also provides an energy storage device with a positioning member. After placing the base on flat ground, the user installs the positioning member into the positioning hole of the base. After stacking the required number of battery packs, the positioning hole on the inverter is aligned with the positioning member, and the positioning member is inserted into the positioning hole to achieve rapid stacking and installation of the battery pack and inverter. The battery pack stacking process is simple and requires few steps. On the one hand, it can save installation time of the energy storage device and improve assembly efficiency. On the other hand, it can eliminate the protrusion and groove structures on the upper and lower sides of the traditional battery pack, reducing mold opening costs and improving the appearance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional diagram of the battery pack provided by the present utility model;

[0021] Figure 2 It is a three-dimensional diagram of the positioning member provided by the utility model;

[0022] Figure 3 This is a structural diagram of the positioning member provided by the utility model;

[0023] Figure 4 This is a structural diagram of another embodiment of the positioning member provided by the utility model;

[0024] Figure 5 It is an exploded schematic diagram of the energy storage device provided by the utility model;

[0025] Figure 6 It is a front view of the energy storage device provided by the utility model.

[0026] In the figure: 1000, battery pack; 100, battery body; 110, upper end surface; 111, first positioning hole; 120, lower end surface; 200, positioning member; 210, first connecting portion; 220, second connecting portion; 221, inner cavity; 222, outlet; 223, elastic member; 224, second guide portion; 225, operating groove; 226, step surface; 230, locking block; 231, limiting portion; 232, first guide portion; 233, positioning groove; 240, cylinder; 250, cover plate; 2000, base; 3000, inverter. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0028] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0029] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0030] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0031] Reference Figures 1 to 4 A battery pack 1000 provided by an embodiment of the present invention includes a battery body 100 and a positioning member 200. The battery body 100 can be in the shape of a cube. The battery body 100 can include a flat upper end surface 110 and a lower end surface 120. The upper end surface 110 and the lower end surface 120 are both parallel to the horizontal plane. The battery body 100 is provided with positioning holes, and the positioning holes include a first positioning hole 111 provided on the upper end surface 110 and / or a second positioning hole provided on the lower end surface 120.

[0032] In other words, at least one of the upper end face 110 and the lower end face 120 of the battery body is provided with a positioning hole, and positioning holes can also be provided on both the upper end face 110 and the lower end face 120. For example, when the energy storage device only stacks two battery packs 1000, a first positioning hole 111 can be provided on the upper end face 110 of the battery body 100 of one of the battery packs 1000, and a second positioning hole can be provided on the lower end face 120 of the battery body 100 of the other battery pack 1000. When the energy storage device needs to stack more than two battery packs 1000, positioning holes can be provided on the upper end face 110 and the lower end face 120 of the battery pack 1000 located in the middle part (the battery pack 1000 that needs to be connected to other battery packs 1000 on both the upper and lower sides). This is specially explained here to avoid misunderstanding. In some optional embodiments, there are at least two positioning members 200, and there can also be at least two positioning holes. The at least two positioning members 200 and the at least two positioning holes on the same end face are provided in a one-to-one correspondence. That is, at least two positioning members 200 may be provided in a one-to-one correspondence with at least two first positioning holes 111 provided on the upper end surface 110 , or may be provided in a one-to-one correspondence with at least two second positioning holes provided on the lower end surface 120 .

[0033] In some optional embodiments, the positioning member 200 is provided with a first connecting portion 210 and a second connecting portion 220 connected to each other, the first connecting portion 210 can be plugged into and fitted with the first positioning hole 111, and the second connecting portion 220 can be plugged into and fitted with the second positioning hole.

[0034] The battery body 100 can be stacked up and down with other battery bodies 100 through the plug-in cooperation between the first positioning hole 111 or the second positioning hole and the positioning member 200 .

[0035] It should be noted that along the stacking direction of the battery packs 1000 (i.e., the vertical direction), the depth of the first positioning hole 111 is greater than or equal to the first connecting portion 210 and the second connecting portion 220 can pass through the second positioning hole, so that when the battery packs 1000 are stacked, the upper end faces 110 and lower end faces 120 of two adjacent battery packs 1000 are in contact with each other, thereby improving the sealing and fit of the energy storage device.

[0036] It is understood that by providing positioning holes and positioning member 200, the user can install positioning member 200 into first positioning hole 111 on upper end surface 110 of battery body 100, align the second positioning hole on the lower end surface 120 of another battery body 100 with positioning member 200, and insert positioning member 200 into the second positioning hole, thereby achieving rapid stacking and installation of battery packs 1000. This reduces the number of steps required for stacking battery packs 1000 and simplifies the operation, saving energy storage device installation time and improving assembly efficiency. Furthermore, the protruding and recessed structures on the upper and lower sides of traditional battery packs 1000 can be eliminated, reducing mold costs and improving the appearance.

[0037] In some embodiments, the first positioning hole 111 and the second positioning hole can be set as circular holes respectively, the first connecting portion 210 can be set as a cylinder matching the first positioning hole 111, and the second connecting portion 220 can be set as a cylinder matching the second positioning hole. Such a setting can improve the structural consistency of the battery pack 1000 while facilitating the mold opening processing of the battery pack 1000 and the subsequent installation of the positioning part 200.

[0038] In some optional embodiments, the first positioning hole 111 and the second positioning hole can also be set as polygonal holes respectively, the first connecting portion 210 can be set as a prism matching the first positioning hole 111, and the second connecting portion 220 can be set as a prism matching the second positioning hole, thereby improving the installation stability of the positioning member 200.

[0039] Preferably, the inner diameter of the first positioning hole 111 is usually set to be smaller than the inner diameter of the second positioning hole, that is, the outer diameter of the first connection part 210 is usually smaller than the outer diameter of the second connection part 220, and the positioning member 200 has an outer shape that is larger at the top and smaller at the bottom. At this time, a step surface 226 surrounding the first connection part 210 is naturally formed at the connection between the first connection part 210 and the second connection part 220. When the first connection part 210 is installed in the first positioning hole 111, the step surface 226 abuts against the upper end face 110, which can prevent the positioning member 200 from passing through the first positioning hole 111 and falling into the interior of the battery pack 1000. At the same time, it can also play a certain supporting role, thereby improving the load-bearing capacity of the positioning member 200. During the installation process, the pressure that the positioning member 200 may be subjected to is dispersed to the upper end face 110, thereby avoiding crushing or damaging the electrical components inside the battery pack 1000 located below the positioning member 200.

[0040] Preferably, the first positioning hole 111 can also be set as a threaded hole. In this case, the first connecting part 210 is set as a stud that matches the first positioning hole 111. After the first connecting part 210 is rotated and inserted into the first positioning hole 111, it is threadedly matched with the first positioning hole 111, which can greatly improve the installation stability of the positioning member 200.

[0041] In addition, the first positioning hole 111 and the first connecting portion 210 may also adopt interference fit, snap fit, or the like to achieve a fixing effect similar to that of a threaded fit, which will not be described in detail here.

[0042] Preferably, an operating slot 225 for cooperating with an external bit is provided at the top of the second connecting portion 220. The operating slot 225 may be a flat slot, a cross slot, a hexagonal slot, etc., which will not be described in detail here.

[0043] When the first connection part 210 and the first positioning hole 111 are difficult to thread together or to assemble manually, the operating groove 225 provided on the second connection part 220 and cooperating with the external bit can facilitate the user to quickly assemble the positioning part 200 with the help of tools such as a screwdriver, thereby improving the user experience.

[0044] Reference Figure 1 As shown, it can be understood that since neither the upper end surface 110 nor the lower end surface 120 is provided with a protruding structure or a groove structure, the positioning member 200 does not need to be provided at the edges of the battery pack 1000 or along the diagonal arrangement to avoid the protruding structure or the groove structure. Instead, it can be provided at the center of the wide side of the battery body 100 (i.e., along the width direction of the battery body 100, the spacing between the positioning member 200 and the two sides of the battery body 100 is equal) and spaced apart along the length direction of the battery body 100. In this case, the first positioning hole 111 provided on the lower end surface 120 and the second positioning hole provided on the upper end surface 110 are also provided at the center of the wide side of the battery body 100 and spaced apart along the length direction of the battery body 100.

[0045] The positioning members 200 are arranged at intervals along the length direction of the battery body 100, and the first positioning holes 111 and the second positioning holes are arranged corresponding to the positioning members 200. On the one hand, it can avoid the problems of fragile structures of the first positioning holes 111 and the second positioning holes and unstable installation caused by opening holes at the edges or corners of the battery pack 1000; on the other hand, the positioning members 200 arranged at intervals along the length direction of the battery body 100 are arranged more regularly and orderly. During the hole manufacturing process, the first positioning hole 111 on the upper end face 110 and the second positioning hole on the lower end face 120 are easier to position and align. During the assembly process, it is also more convenient for construction personnel to observe the alignment, further improving assembly efficiency and reducing production costs.

[0046] Reference Figure 2 As shown, it can be understood that, under the premise that the first connecting part 210 can be detachably fixed to the first positioning hole 111, the positioning member 200 is provided with a locking block 230, and the locking block 230 is connected to the second connecting part 220. The locking block 230 is configured so that after the second connecting part 220 is inserted into the second positioning hole, the locking block 230 can protrude from the outer wall of the second connecting part 220 to limit the battery body 100 that cooperates with the second connecting part 220 in the vertical direction.

[0047] By providing the locking block 230, when the second connecting portion 220 is inserted into the second positioning hole, the locking block 230 automatically protrudes from the outer wall of the second connecting portion 220, thereby limiting the upper battery pack 1000 in the vertical direction. The locking block 230 and the upper end surface 110 of the battery pack 1000 located below cooperate to clamp the bottom plate of the battery pack 1000, thereby fixing the upper battery pack 1000, eliminating the traditional sheet metal screw fixing structure, simplifying the structure of the energy storage device, improving assembly efficiency, and effectively improving the structural stability of the energy storage device and reducing material costs.

[0048] Reference Figure 3 As shown, it can be understood that the second connecting portion 220 is provided with an inner cavity 221 and an outlet 222. The outlet 222 is provided on the side wall of the second connecting portion 220 and communicates with the inner cavity 221. An elastic member 223 is provided in the inner cavity 221. A locking block 230 is slidably mounted in the inner cavity 221 in a direction perpendicular to the second connecting portion 220 (when the second connecting portion 220 is cylindrical, the locking block 230 slides in the inner cavity 221 along the radial direction of the second connecting portion 220). The locking block 230 is connected to the end of the elastic member 223 and can enter and exit the inner cavity 221 through the outlet 222. The elastic member 223 is a component that can provide elastic force, such as a spring or rubber column, and is not described in detail here.

[0049] Preferably, the locking block 230 is provided with a limiting portion 231, which is a protruding structure arranged on the outer peripheral wall of the locking block 230. The limiting portion 231 can be in limited abutment with the inner wall of the second connecting portion 220, so that when the elastic member 223 abuts the locking block 230, the end of the locking block 230 away from the elastic member 223 just passes through the outlet 222 and the locking block 230 will not leave the inner cavity 221.

[0050] The locking block 230 also has a first guide portion 232, which is used to guide the locking block 230 into the second positioning hole. When the user stacks the battery packs 1000, the first guide portion 232 cooperates with the inner wall of the second positioning hole to guide the locking block 230 on the second connecting portion 220 back into the inner cavity 221 and then into the second positioning hole, preventing interference between the locking block 230 and the inner wall of the second positioning hole.

[0051] In some embodiments, the first guide portion 232 can be a curved, inclined, or spherical structure provided at the end of the locking block 230. For example, the portion of the locking block 230 that passes through the outlet 222 can be configured as a hemisphere. The upper half of the hemisphere forms the first guide portion 232 that guides the second connecting portion 220 into the second positioning hole. The lower half of the hemisphere can guide the second connecting portion 220 out of the second positioning hole, facilitating the installation or removal of the battery pack 1000. The structure of the first guide portion 232 is not specifically limited herein; users can select an appropriate guide structure based on their actual needs, as long as the second connecting portion 220 can stably and smoothly enter the second positioning hole.

[0052] After the user inserts the second connecting portion 220 into the second positioning hole, the elastic member 223 drives the locking block 230 to automatically pop out of the outlet 222 and abut against the inner bottom surface of the battery pack 1000. The limiting portion 231 prevents the locking block 230 from leaving the inner cavity 221, thereby securing the battery pack 1000. The provision of the elastic member 223 and the limiting portion 231 effectively improves the ease of use and structural rationality of the positioning member 200 while ensuring the stable stacking of the battery pack 1000.

[0053] Preferably, the positioning member 200 may include a cylinder 240 with an opening at one end and a cover plate 250, the side of the cylinder 240 is hollowed out to form an outlet 222, an elastic member 223 and a locking block 230 are installed in the cylinder 240, the cover plate 250 and the cylinder 240 are fixedly connected to form a second connecting portion 220, and the first connecting portion 210 is arranged on the side of the cover plate 250 away from the cylinder 240.

[0054] The positioning member 200 is provided in a split manner, and the contact area between the locking block 230 in the positioning member 200 and the inner wall of the outlet 222 is larger, which can ensure a better limiting effect.

[0055] It should be noted that the positioning member 200 can also be a solid one-piece molded part. In this case, the first connecting part 210 and the second connecting part 220 are molded as one piece. After the positioning member 200 is formed, a blind hole can be opened on the second connecting part 220, and then the locking block 230 (in this case, the locking block 230 is a steel ball that matches the blind hole) and the elastic member 223 are inserted into the blind hole. Then, a special stamping die is used to stamp the end of the blind hole on the side wall of the second connecting part 220, so that the blind hole at one end of the side wall of the second connecting part 220 is contracted to form an outlet 222 that can limit the locking block 230.

[0056] The positioning block is provided in an integrated manner, which can simplify the structure of the positioning member 200 and facilitate the installation and use of the positioning member 200.

[0057] Reference Figure 2 and Figure 3 As shown, it can be understood that a second guide portion 224 is provided at one end of the positioning member 200, and / or a third guide portion is provided at the other end of the positioning member 200, the second guide portion 224 is provided at the bottom end of the first connecting portion 210 to guide the first connecting portion 210 into the first positioning hole 111, and the third guide portion is provided at the top end of the second connecting portion 220 to guide the second connecting portion 220 into the second positioning hole.

[0058] The second guide portion 224 (or the third guide portion) is a chamfered structure arranged at the end of the positioning member 200. By setting the second guide portion 224 and / or the third guide portion, the user saves the time required to accurately align the positioning member 200 and the first positioning hole 111 and accurately align the positioning member 200 and the second positioning hole, thereby further improving the assembly efficiency of the positioning member 200.

[0059] Reference Figure 4 As shown, it can be understood that in some embodiments, two locking blocks 230 are provided, and the two locking blocks 230 are respectively connected to the two ends of the elastic member 223, the outlet 222 and the locking block 230 are correspondingly arranged, and the two opposite ends of the two locking blocks 230 enter and exit the inner cavity 221 through the two outlets 222.

[0060] Two locking blocks 230 are symmetrically arranged. After the second connecting part 220 is inserted into the second positioning hole, the two locking blocks 230 pop out synchronously under the action of the elastic member 223, limiting the battery pack 1000 on both sides of the positioning member 200, effectively enhancing the limiting ability of the positioning member 200, and improving the connection tightness of the stacked battery packs 1000.

[0061] Preferably, a positioning groove 233 is provided at one end of the locking block 230 facing the elastic member 223 . The positioning groove 233 matches the elastic member 223 . The end of the elastic member 223 is accommodated in the positioning groove 233 and abuts against the bottom wall of the positioning groove 233 .

[0062] By providing the positioning groove 233 , the positioning groove 233 improves the installation stability of the elastic member 223 , prevents the elastic member 223 from being significantly twisted or bent and affects the normal pop-up and limiting functions of the locking block 230 , and improves the structural stability of the positioning member 200 .

[0063] The present invention also provides an energy storage device comprising a base 2000, an inverter 3000, and the aforementioned battery pack 1000. The base 2000 has a first positioning hole 111 at its top and a second positioning hole at its bottom. The inverter 3000, at least one battery pack 1000, and the base 2000 are stacked vertically from top to bottom via a positioning member 200. The connection between the base 2000 and the positioning member 200, as well as the coordination between the positioning member 200 and the first and second positioning holes, can be found in the previous description regarding the coordination between the positioning member 200 and the first and second positioning holes, and are not further described here. In some embodiments, the outer peripheral surfaces of the base 2000, inverter, and battery pack 1000 are flush to facilitate alignment and ensure an aesthetically pleasing appearance.

[0064] The energy storage device provided in the embodiment of the present invention includes the battery pack 1000 in the above embodiment. Therefore, the energy storage device provided in the embodiment of the present invention also has the beneficial effects described in the above embodiment, which will not be described in detail here.

[0065] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A battery pack, characterized in that: include: A battery body (100), the battery body (100) comprising an upper end surface (110), a lower end surface (120), and a positioning hole, the positioning hole comprising a first positioning hole (111) provided on the upper end surface (110), and / or a second positioning hole provided on the lower end surface (120); The positioning member (200) is provided with a first connecting portion (210) and a second connecting portion (220), wherein the first connecting portion (210) can be installed in the first positioning hole (111), and the second connecting portion (220) can be plugged into and matched with the second positioning hole; The battery main body (100) is connected to other battery main bodies through the plug-in fit of the positioning hole and the positioning member (200).

2. The battery pack according to claim 1, wherein: The inner diameter of the first positioning hole (111) is smaller than the inner diameter of the second positioning hole.

3. The battery pack according to claim 1 or 2, characterized in that: The positioning member (200) further includes a locking block (230), the locking block (230) being connected to the second connecting portion (220), and the locking block (230) being configured to limit the battery body (100) matched with the second connecting portion (220) in a vertical direction after the second connecting portion (220) is inserted into the second positioning hole.

4. The battery pack according to claim 3, wherein: The second connecting portion (220) is provided with an inner cavity (221) and an outlet (222) communicating with the inner cavity (221); an elastic member (223) is provided in the inner cavity (221); the locking block (230) is connected to the elastic member (223) and is arranged at the end of the elastic member (223) facing the outlet (222); the locking block (230) enters and exits the inner cavity (221) through the outlet (222).

5. The battery pack according to claim 4, characterized in that: The locking block (230) is provided with a limiting portion (231) and a first guiding portion (232), wherein the limiting portion (231) is in limiting contact with the inner wall of the second connecting portion (220), and one end of the locking block (230) away from the elastic member (223) passes through the outlet (222), and the first guiding portion (232) is used to guide the locking block (230) into the second positioning hole.

6. The battery pack according to claim 4, characterized in that: Two locking blocks (230) are provided, and the two locking blocks (230) are respectively connected to the two ends of the elastic member (223), and the outlet (222) and the locking blocks (230) are arranged in a one-to-one correspondence.

7. The battery pack according to claim 4, characterized in that: The locking block (230) is provided with a positioning groove (233), and the end of the elastic member (223) is accommodated in the positioning groove (233) and abuts against the bottom wall of the positioning groove (233).

8. The battery pack according to claim 1, wherein: The top end of the second connecting portion (220) is provided with an operating slot (225) for cooperating with an external bit.

9. The battery pack according to claim 1, wherein: One end of the positioning member (200) is provided with a second guide portion (224), and the second guide portion (224) is used to guide the second connecting portion (220) into the second positioning hole; And / or, the other end of the positioning member (200) is provided with a third guide portion, and the third guide portion is used to guide the first connecting portion (210) into the first positioning hole (111).

10. An energy storage device, characterized in that The invention comprises a base (2000), an inverter (3000) and a battery pack according to any one of claims 1 to 9, wherein the inverter (3000), the battery pack and the base (2000) are stacked in sequence from top to bottom, and two adjacent ones of the inverter (3000), the battery pack and the base (2000) are detachably connected by the cooperation of the positioning member (200) and the positioning hole.

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