Electricity storage device

Abstract

The utility model discloses an electricity storage device, which comprises a battery cell group comprising a plurality of stacked battery cells; the supporting plate is arranged on the first side of the battery cell group; the circuit board is mounted on one side, deviating from the battery cell group, of the supporting plate; the tab bracket is arranged on a second side, adjacent to the first side, of the battery cell group, and comprises a bracket body and a plurality of busbars arranged on the bracket body; one end, close to the supporting plate, of the bracket body is provided with a platform part extending towards the direction away from the battery cell group; the circuit board and the supporting plate are detachably connected with the platform part; the shell, the battery cell group, the supporting plate, the circuit board and the tab bracket are all mounted in the shell, and the platform part is connected with the shell. The power storage device has the beneficial effects that the circuit board, the supporting plate and the tab bracket can be connected with the shell of the power storage device through the platform part and the fastener, other connecting parts are not needed, and the size of the power storage device is effectively reduced.

Description

Technical Field

[0001] This utility model relates to the field of energy storage device technology, and more specifically, to an energy storage device. Background Technology

[0002] The BMS (Battery Management System) protection board is used to monitor the status of the energy storage device and prevent overcharging or over-discharging. The circuit board is fixed inside the energy storage device housing by a support plate. The tab brackets support and secure the conductive busbars; the tabs pass through the tab brackets and are soldered to the conductive busbars. Both the support plate and the tab brackets are located inside the energy storage device housing.

[0003] Currently, the support plate and electrode bracket are fixed to the energy storage device housing separately. Furthermore, to ensure a stable connection between the support plate / electrode bracket and the energy storage device housing, a large number of screws or other connectors are used. This increases the size or weight of the energy storage device to some extent, which is detrimental to improving its energy density. Additionally, the assembly process is cumbersome and costly. Utility Model Content

[0004] To address the aforementioned problems, the purpose of this utility model is to provide an energy storage device.

[0005] This utility model provides an energy storage device, comprising:

[0006] A battery cell assembly, comprising multiple cells stacked together;

[0007] A support plate is disposed on the first side of the battery cell assembly;

[0008] A circuit board is mounted on the side of the support plate opposite to the battery cell assembly; and

[0009] A tab support is disposed on the second side of the battery cell assembly adjacent to the first side. The tab support includes a support body and a plurality of busbars disposed on the support body.

[0010] The bracket body has a platform portion extending away from the battery cell assembly at one end near the support plate, and the circuit board and the support plate are detachably connected to the platform portion;

[0011] The housing, the battery cell assembly, the support plate, the circuit board and the electrode bracket are all installed inside the housing, and the platform is connected to the housing.

[0012] As an optional implementation, the circuit board includes a first conductive bus, the plurality of busbars include the first busbar, the platform portion is provided with a first fastener, the first fastener detachably connects and electrically connects the first conductive busbar and the first busbar; and / or

[0013] The support plate includes a second conductive bus that is electrically connected to the circuit board. The plurality of busbars include the second busbar. The platform portion is provided with a second fastener, which detachably connects and electrically connects the second conductive busbar and the second busbar.

[0014] As an optional implementation, the platform portion has two spaced-apart limiting baffles on its surface facing the support plate, the support plate has a limiting protrusion that extends between the two limiting baffles, and the limiting protrusion is detachably connected to the platform portion.

[0015] As an optional implementation, the device also includes a housing and a third fastener, wherein the limiting protrusion, the platform portion, and the housing are bolted together by the third fastener.

[0016] As an optional implementation, the housing includes a first sidewall located on the same side of the battery cell assembly as the tab support. The first sidewall has a limiting recess, and a portion of the limiting protrusion extending beyond the two limiting baffles extends into the limiting recess; and / or

[0017] The housing also includes a second sidewall, which is located on the side of the battery cell assembly opposite to the first sidewall. The second sidewall is provided with a positioning pin, and the support plate is provided with a positioning pin hole, into which the positioning pin is inserted.

[0018] As an optional implementation, the plurality of buses includes a first bus and a second bus electrically connected to the circuit board, and the two limiting baffles are located between the first bus and the second bus.

[0019] As an optional implementation, the support plate has multiple buckles on its periphery, and the periphery of the circuit board abuts against the multiple buckles.

[0020] As an optional implementation, the first conductive busbar has a bent portion at one end near the circuit board; and / or,

[0021] The support plate has a mounting cavity on the side away from the battery cell assembly. The second conductive bus is inserted into the mounting cavity, and one end of the second conductive bus near the tab bracket extends to the outside of the mounting cavity.

[0022] The mounting cavity has an opening on the side away from the battery cell assembly, and the surface of the second conductive bus facing away from the battery cell assembly is at least partially exposed in the opening.

[0023] As an optional implementation, the first side of the battery cell assembly is provided with structural adhesive, which is bonded to both the support plate and the battery cell assembly; and / or,

[0024] Structural adhesive is provided on the third side of the battery cell assembly opposite to the first side, and the structural adhesive is bonded to the bottom wall of the battery cell assembly and the housing respectively.

[0025] As an optional implementation, the housing includes a third sidewall and a fourth sidewall, the third sidewall being disposed opposite to each other and located between the first sidewall and the second sidewall, and the third sidewall and / or the fourth sidewall having a limiting groove on the side facing the battery cell assembly;

[0026] The electrode bracket and the two sides corresponding to the third sidewall and / or the fourth sidewall are provided with edges that protrude away from the battery cell assembly, and the edges are embedded in the limiting groove.

[0027] The beneficial effects of this utility model are as follows: A platform portion that bends away from the support plate is provided at the upper end of the electrode bracket. The support plate and electrode bracket can be connected to the shell through the platform portion, thereby avoiding the need for the support plate or electrode bracket to be repeatedly fixed to the shell, thus simplifying the structure of the energy storage device; and since the support plate and electrode bracket are located on two adjacent sides of the battery cell assembly and are connected at an angle, the structural strength of the energy storage device is also improved. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of an exemplary energy storage device;

[0030] Figure 2 This is a schematic diagram of an exemplary support plate.

[0031] Figure 3 This is a schematic diagram of an exemplary electrode holder;

[0032] Figure 4 This is a schematic diagram of an exemplary housing structure;

[0033] Figure 5 for Figure 4 Enlarged view of point B in the middle;

[0034] Figure 6 for Figure 4 Enlarged view of point C in the middle;

[0035] Figure 7 for Figure 1 Assembly diagram;

[0036] Figure 8 for Figure 7 Top view;

[0037] Figure 9 for Figure 8 Enlarged view of point A in the middle.

[0038] In the picture,

[0039] 10. Support plate; 11. Positioning pin hole; 12. Buckle; 13. Second conductive busbar; 14. Limiting protrusion; 15. Mounting cavity; 20. Electrode bracket; 21. Platform section; 211. First fastener; 212. Second fastener; 213. Third fastener; 22. Main body section; 23. Limiting baffle; 24. Busbar; 241. First busbar; 242. Second busbar; 25. Edge; 40. Cell assembly; 50. Housing; 51. Limiting recess; 52. Positioning pin; 53. Limiting groove; 54. First sidewall; 55. Second sidewall; 56. Third sidewall; 57. Fourth sidewall; 60. Circuit board; 61. First conductive busbar. Detailed Implementation

[0040] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0041] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0042] Furthermore, the terminology used in the description of this utility model is for illustrative purposes only and is not intended to limit the scope of this utility model. The terms "comprising" and / or "including" are used to specify the presence of the said elements, steps, operations, and / or components, but do not exclude the presence or addition of one or more other elements, steps, operations, and / or components. The terms "first," "second," etc., may be used to describe various elements, do not represent an order, and do not limit these elements. In addition, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more. These terms are used only to distinguish one element from another. These and / or other aspects become apparent in conjunction with the following drawings, and those skilled in the art will more readily understand the description of the embodiments of this utility model. The drawings are used for illustrative purposes only to depict the embodiments of this utility model. Those skilled in the art will readily recognize from the following description that alternative embodiments of the structures and methods shown in this utility model can be employed without departing from the principles of this utility model.

[0043] For ease of understanding, in the accompanying drawings of this application, the X-axis represents the length direction of the energy storage device, i.e., the length direction of the battery cell assembly; the Y-axis represents the thickness direction of the energy storage device, i.e., the thickness direction of the battery cell assembly; and the Z-axis represents the width direction of the energy storage device, i.e., the width direction of the battery cell assembly.

[0044] An embodiment of the present invention provides an energy storage device comprising a support plate 10, a tab bracket 20, a battery cell assembly 40, a housing 50, and a circuit board 60.

[0045] by Figure 1 Let's take an example to illustrate: Figure 1 The battery cell assembly 40 includes multiple battery cells stacked sequentially along the thickness direction of the energy storage device. The number of battery cells can be set according to the power requirements of the energy storage device. The battery cell assembly 40 is placed laterally inside the housing 50, for example, with the tabs of the battery cell assembly 40 facing the side wall of the housing 50. The support plate 10, the tab bracket 20, the battery cell assembly 40, and the circuit board 60 are all installed inside the housing 50.

[0046] The support plate 10 is disposed, for example, above the battery cell assembly 40. The support plate 10 mounts and supports the circuit board 60, that is, the circuit board 60 is mounted, for example, on the upper surface of the support plate 10. In other words, the support plate 10 is located between the battery cell assembly 40 and the circuit board 60, which can provide a fixed support for the circuit board 60 on the one hand, and also provide a certain degree of isolation and insulation between the battery cell assembly 40 and the circuit board 60 on the other hand.

[0047] The tabs corresponding to multiple cells in the cell assembly 40 pass through the tab bracket 20 and are soldered to multiple busbars 24 located on the tab bracket 20, thereby realizing the connection between the multiple cells and / or between the cell assembly 40 and an external circuit. It is easy to understand that the tab bracket 20 is located between the cell assembly 40 and the side wall of the housing 50. For example, if the tabs of the cell assembly 40 are positioned facing the right side wall of the housing 50, then the tab bracket 20 is located between the cell assembly 40 and the right side wall of the housing 50 to facilitate the connection between the tabs and the busbars 24.

[0048] Please see Figure 3 The structure of the tab support 20 is illustrated exemplarily. The tab support 20 includes, for example, a support body and a plurality of busbars 24 disposed on the support body. The support body includes, for example, a platform portion 21 and a main body portion 22 disposed at an angle. The platform portion 21 is formed, for example, extending a certain distance away from the battery cell assembly 40. The main body portion 22 is formed, for example, extending along the width direction of the battery cell assembly 40, and the extension distance of the main body portion 22 is adapted to the width of the battery cell assembly 40. That is, the dimension of the main body portion 22 in the width direction of the battery cell assembly 40 can be equal to or slightly smaller than the width of the battery cell assembly 40, so that the tab can have sufficient connection area with the busbars 24 and improve the current carrying capacity.

[0049] Preferably, the angle between the platform portion 21 and the main body portion 22 is 90°, that is, the platform portion 21 is parallel to the length direction of the cell assembly 40, and the main body portion 22 is parallel to the width direction of the cell assembly 40. This facilitates the connection between the cell assembly 40 and the tab support 20, and minimizes the space occupied by the connection, which is beneficial to reducing the size of the energy storage device.

[0050] Optionally, the included angle between the platform portion 21 and the main body portion 22 can be any value between 70° and 110°, such as 72°, 75°, 80°, 85°, 95°, 100°, 105°, 118°, etc.

[0051] See also Figure 3 Some of the multiple busbars 24 are detachably connected to the platform section 21. For example, two of the multiple busbars 24 near the platform section 21 are detachably connected to the platform section 21, such as the first busbar 241 and the second busbar 242.

[0052] Preferably, the first busbar 241 and the second busbar 242 have the same shape. For example, they both include a first part and a second part arranged at an angle, wherein the first part is parallel to the platform portion 21 and the second part is parallel to the main body portion 22. Further, the second part is inserted into the main body portion 22 through an opening on the platform portion 21 and extends to the surface of the main body portion 22 facing away from the cell assembly 40, while the first part is located on the side of the platform portion 21 facing away from the main body portion 22. Thus, by means of the arrangement of the tab bracket 20 itself, the first busbar 241 and the second busbar 242, under their own weight and the combined action of the platform portion 21, are arranged in a state similar to "suspension" with the platform portion 21, thereby achieving a detachable connection between the first busbar 241 and the second busbar 242 and the tab bracket 20.

[0053] Furthermore, other connection structures can be used to further solidify the detachable connection between the first busbar 241 and the second busbar 242 and the tab support 20. For example, a connecting post can be provided on the side of the platform portion 21 facing away from the main body portion 22, and through holes adapted to the connecting post can be provided at corresponding positions of the first portions of the first busbar 241 and the second busbar 242. By inserting the connecting post into the through hole and using fasteners, a detachable connection between the first portion and the platform portion 21 can be achieved, and the connection between the first busbar 241 and the second busbar 242 and the tab support 20 can be made more stable. The above is only an illustrative example. In use, other connection structures can also be used to achieve a detachable connection between the first portion and the platform portion 21, and this application does not specifically limit it.

[0054] See also Figure 1 As described above, the circuit board 60 is mounted above the cell assembly support plate 10, which is located above the cell assembly 40. Meanwhile, the tab bracket is located on the right side of the cell assembly 40. This ensures that the end of the support plate 10 near the tab bracket 20 (e.g., the right end of the support plate 10) and the end of the circuit board 60 near the tab bracket 20 (e.g., the right end of the circuit board 60) are both located above the platform portion 21. Thus, a detachable connection between the support plate 10, the circuit board 60, and the platform portion 21 can be achieved through the right ends of the support plate 10 and the circuit board 60. This simplifies the connection structure between the support plate 10, the circuit board 60, and the tab bracket 20, and minimizes the number of fasteners used. This not only helps reduce the size of the energy storage device but also reduces its weight to some extent, thereby improving the energy density of the energy storage device.

[0055] Please see Figures 1 to 8 To further illustrate the connection relationship between the support plate 10, the circuit board 60, the platform section 21, and the housing 50:

[0056] For example, the circuit board 60 includes a first conductive bus 61, which is located at the end of the circuit board 60 near the tab support 20, i.e., at the right end of the circuit board 60. One end of the first conductive bus 61 is soldered to the right end of the circuit board 60, for example. The other end of the first conductive bus 61, i.e., the end of the first conductive bus 61 located above the platform portion 21, has a through hole. This through hole fits onto the connecting post of the platform portion 21, so that the other end of the first conductive bus 61 contacts the first part of the first bus 241. Then, the other end of the first conductive bus 61, the first part of the first bus 241, and the platform portion 21 are fastened together by the first fastener 211. It is easy to understand that the first conductive bus 61 is made of a conductive material with a certain rigidity, such as copper or aluminum. Thus, the first conductive bus 61 and the first bus 241 are simultaneously fixed to the platform portion 21 by the first fastener 211. This not only enables electrical connection between the first conductive bus 61 and the first bus 241, but also allows for detachable connection between the first conductive bus 61, the first bus 241, and the platform portion 21. This further simplifies the connection structure between the first conductive bus 61, the first bus 241, and the platform portion 21.

[0057] Preferably, the first conductive bus 61 has a bend at one end near the circuit board 60, that is, a bend is provided at the end where the first conductive bus 61 connects to the circuit board 60. Optionally, this bend can be a U-shaped bend, a C-shaped bend, or an S-shaped bend with an arc transition. In this way, when the first conductive bus 61 and the first busbar 241 are fastened together by the first fastener 211, a certain degree of flexibility can be added to the connection between the first conductive bus 61 and the circuit board 60, avoiding deformation or breakage of the circuit board 60 due to the rigidity of the first conductive bus 61.

[0058] For example, the support plate 10 includes a second conductive busbar 13, which is located at one end of the support plate 10 near the node 20, i.e., the second conductive busbar 13 is located near the right end of the support plate 10. The second conductive busbar 13 is, for example, an approximately rectangular plate shape, with one end fixed to the support plate 10 and electrically connected to the circuit board 60 located on the support plate 10. The other end of the second conductive busbar 13, i.e., the end of the second conductive busbar 13 located above the platform portion 21, is provided with a through hole. This through hole is fitted onto the connecting post provided on the platform portion 21, so that the other end of the second conductive busbar 13 contacts the first part of the second busbar 242. Then, the other end of the second conductive busbar 13, the first part of the second busbar 242, and the platform portion 21 are fastened together by the second fastener 212. It is easy to understand that the second conductive bus 13, similar to the first conductive bus 61, is also made of a conductive material with a certain rigidity, such as copper or aluminum. Thus, the second conductive bus 13 and the second bus 242 are simultaneously fixed to the platform portion 21 by the second fastener 212. This not only enables electrical connection between the second conductive bus 13 and the second bus 242, but also allows for a detachable connection between the second conductive bus 13, the second bus 242, and the platform portion 21. This further simplifies the connection structure between the second conductive bus 13, the second bus 242, and the platform portion 21.

[0059] By setting the first conductive bar 61 and the second conductive bar 13 on the circuit board 60 and the support plate 10 respectively, the torsional resistance between the tab bracket 20 and the circuit board 60 and the support plate 10 can be improved.

[0060] Preferred, such as Figure 1 and Figure 2 As shown, a mounting cavity 15 is provided on the side of the support plate 10 facing the circuit board 60, that is, the mounting cavity 15 is located on the upper surface of the support plate 10. One end of the second conductive bus 13 is connected to the support plate 10 through the mounting cavity 15. For example, one end of the second conductive bus 13 is integrally injection molded with the mounting cavity 15 and the support plate 10. At the same time, a pin is also provided on one end of the second conductive bus 13, and the pin extends to the outside of the mounting cavity 15 in the direction of the circuit board 60, so that the pin is electrically connected to the circuit board 60. The other end of the second conductive bus 13 extends to the outside of the mounting cavity 15 in the direction of the tab bracket 30, so that it is located directly above the platform portion 21, so as to facilitate the connection between the second conductive bus 13 and the platform portion 21. Furthermore, an opening can be provided on the upper surface of the mounting cavity 15 to expose part or all of the upper surface of the second conductive bus 13, so as to facilitate heat dissipation of the second conductive bus 13.

[0061] The platform section has two spaced-apart limiting baffles on its surface facing the support plate. The support plate has a limiting protrusion that extends between the two limiting baffles and is detachably connected to the platform section.

[0062] See Figure 2 and Figure 3 For example, two limiting baffles 23 are provided on the upper surface of the platform portion 21, and the two limiting baffles 23 are arranged opposite to each other. At the same time, a limiting protrusion 14 is provided at one end of the support plate 10 near the platform portion 21. The limiting protrusion 14 may be provided, for example, at the middle position of the right end of the support plate 10 to improve the stability of fixing the support plate 10.

[0063] It is understood that the limiting protrusion 14 is formed by extending the right end of the support plate 10 along the length direction of energy storage, thereby allowing the limiting protrusion 14 to extend to the position between the two limiting baffles 23. The two limiting baffles 23 block the limiting protrusion 14, thus limiting the support plate 10 and preventing it from moving along the upper surface of the cell assembly 40. At the same time, the limiting protrusion 14 can be detachably connected to the platform part 21, further connecting the support plate 10 and the platform part 21, which has better stability than the connection between the second conductive bus 13 and the platform part 21 alone.

[0064] Additionally, it is understood that the limiting baffle 23 is located between the first portion of the first busbar 241 and the first portion of the second busbar 242, and extends a certain height away from the platform portion 21, such that the limiting baffle 23 extends beyond the first conductive busbar 61 and / or the second conductive busbar 13 in the width direction of the cell assembly 40. That is, in the width direction of the cell assembly 40, the size of the limiting baffle 23 is greater than the sum of the sizes of the first conductive busbar 61 and the first busbar 241, and / or greater than the sum of the sizes of the second conductive busbar 13 and the second busbar 242. This allows the two limiting baffles 23 to isolate the first conductive busbar 61, the first busbar 241, the second conductive busbar 13, and the second busbar 242, thereby providing a certain degree of insulation.

[0065] Furthermore, the energy storage device also includes a third fastener, and the limiting protrusion, platform and housing are bolted together by the third fastener. The cell assembly is located in the space formed by the housing, support plate and tab bracket.

[0066] See Figure 7 and Figure 8To further illustrate the connection relationship between the limiting protrusion 14, the platform portion 21, and the housing 50. As previously described, the tab support 20 is located between the cell assembly 40 and the right side wall of the housing 50. The platform portion 21 is located, for example, on the upper end face of the right side wall of the housing 50, that is, the platform portion 21 is located above and parallel to the upper end face. At the same time, the limiting protrusion 14 is located between the two baffles 23 on the platform portion 21, that is, the limiting protrusion 14 is located above the platform portion 21. Thus, along the width direction of the energy storage device, the limiting protrusion 14, the platform portion 21, and the right side wall of the housing 50 are arranged in a stacked manner from top to bottom, and a detachable connection between the three can be achieved by means of the third fastener 213. For example, the third fastener 213 is a bolt, and threaded holes adapted to the bolt are opened at the overlapping positions of the limiting protrusion 14, the platform portion 21, and the right side wall of the housing 50, so that a detachable connection between the limiting protrusion 14, the platform portion 21, and the housing 50 can be achieved by the cooperation of the bolt and the threaded holes. In this way, the connection structure between the support plate 10, the tab bracket 20 and the housing 50 is simplified. The support plate 10 and the tab bracket 20 can be connected to the housing 50 through the platform section alone, thereby avoiding the need for the support plate 10 or the tab bracket 20 to be repeatedly fixed to the housing 50, thus simplifying the structure of the energy storage device. Furthermore, since the support plate 10 and the tab bracket 20 are located on two adjacent sides of the cell assembly 40 (for example, on the upper side and the right side of the cell assembly 40 respectively), and the connection between them is at an angle, the structural strength of the energy storage device can also be improved.

[0067] The above is merely an illustrative example; the detachable connection between the limiting protrusion 14, the platform portion 21, and the housing 50 can also be achieved using other connection methods. This application does not specifically limit the detachable connection method between these three components.

[0068] In one alternative embodiment, the housing includes a first sidewall 54, which is located on the same side of the battery cell assembly 40 as the tab support 20. The first sidewall 54 is provided with a limiting recess 51, and the portion of the limiting protrusion 14 extending beyond the two limiting baffles 23 extends into the limiting recess 51.

[0069] See Figure 4 and Figure 6The first sidewall 54 of the housing 50 is, for example, one of the two sidewalls of the housing 50 along the length of the energy storage device, i.e., the platform portion 21 of the tab support 20 is located on this sidewall. A limiting recess 51 is provided on the side of this sidewall facing the cell assembly 40, i.e., a limiting recess 51 is provided on the inner surface of this sidewall. It is understood that the position of the limiting recess 51 is adapted to the position of the limiting protrusion 14. For example, the position of the limiting recess 51 in the width direction of the energy storage device is flush with the position of the limiting protrusion 14 in that direction, to ensure that the limiting protrusion 14 can extend to the limiting recess 51; at the same time, the dimension of the limiting recess 51 in the thickness direction of the energy storage device should also be adapted to the dimension of the limiting protrusion 14. For example, the dimension of the limiting recess 51 in the thickness direction of the energy storage device is slightly larger than the dimension of the limiting protrusion 14 in that direction, which not only facilitates the limiting protrusion 14 to be embedded in the limiting recess 51, but also prevents it from being too large to effectively limit the support plate 10. Therefore, while the limiting baffle 23 restricts the support plate 10 from moving relative to the tab bracket 20, the limiting recess 51 can further restrict the support plate 10 from moving relative to the housing 50, thus better limiting the support plate 10.

[0070] Furthermore, the housing also includes a second sidewall 55, which is located on the side of the cell assembly 40 opposite to the first sidewall 54. The second sidewall 55 is provided with a positioning pin 52, and the support plate 10 is provided with a positioning pin hole 11, into which the positioning pin 52 is inserted.

[0071] See Figure 2 , Figure 4 and Figure 5 The second sidewall of the housing 50 is, for example, one of the two sidewalls of the housing 50 along the length of the energy storage device. A positioning pin 52 is provided on one end of this sidewall facing the support plate 10, for example, at the middle position of the upper end face of the sidewall. A positioning pin hole 11 adapted to the positioning pin 52 is provided at the opposite position of the support plate 10, for example, the positioning pin hole 11 can be provided on the side of the support plate 10 opposite to the limiting protrusion 14. Thus, the end of the support plate 10 near the limiting protrusion 14 can be fixed by the limiting protrusion 14 and the limiting recess 51, and the end of the support plate near the positioning pin hole 11 can be fixed by the positioning pin 52 and the positioning pin hole 11. In this way, the support plate 10 can be limited and fixed between its two opposite ends and the housing 50, which not only simplifies the structure, but also effectively saves the assembly space in the housing 50, thereby increasing the usable space of the cell assembly 40.

[0072] In one alternative embodiment, the support plate has multiple snap fasteners on its periphery, and the periphery of the circuit board abuts against the multiple snap fasteners.

[0073] like Figure 1 As shown, multiple latches 12 are provided on the peripheral edge of the support plate 10. It is easy to understand that the multiple latches 12 extend a certain height toward the circuit board 60. The peripheral wall of the circuit board 60 abuts against the inner wall of the multiple latches 12 to limit the circuit board 60 by the multiple latches 12, preventing the circuit board 60 from moving in the direction parallel to the support plate 10; at the same time, the protruding part located at the upper end of the latches 12 can limit the movement of the support plate 10 in the width direction of the energy storage device.

[0074] Preferably, the multiple latches 12 can be arranged in pairs, with each pair of latches 12 facing each other. For example, the positions of each pair of latches 12 in the thickness direction of the energy storage device are aligned with each other, and the protruding portion at the upper end of each latch 12 extends toward the circuit board 60. In this way, each pair of latches 12 can apply force to the circuit board 60 through their oppositely arranged sides, thus better fulfilling its limiting function.

[0075] In one alternative embodiment, a structural adhesive is provided on a first side of the battery cell assembly, which is bonded to a support plate and the battery cell assembly respectively; and / or, the energy storage device further includes a housing, and a structural adhesive is provided on a third side of the battery cell assembly opposite to the first side, which is bonded to the bottom of the battery cell assembly and the housing respectively.

[0076] by Figure 1 For example, structural adhesive is provided on the upper surface of the battery cell assembly 40. The structural adhesive is placed between the battery cell assembly 40 and the support plate 10 to bond the support plate 10 and the battery cell assembly 40. The support plate 10 applies a certain pressure to the battery cell assembly 40 to prevent the battery cell assembly 40 from shaking inside the housing 50.

[0077] Furthermore, structural adhesive is provided on the lower end face of the cell assembly 40. This structural adhesive is located, for example, between the bottom of the cell assembly 40 and the bottom of the housing 50, to bond the cell assembly 40 to the bottom of the housing 50, thereby fixing the cell assembly 40 to the housing 50.

[0078] Therefore, by applying pressure to the battery cell assembly 40 by the support plate 10, and combining the structural adhesive between the battery cell assembly 40 and the bottom of the housing 50, the battery cell assembly 40 can be better fixed inside the housing 50, thereby ensuring the safety of the energy storage device during use.

[0079] In one optional embodiment, the housing includes a third sidewall and a fourth sidewall, the third sidewall being disposed opposite to each other and located between the first sidewall and the second sidewall, and the third sidewall and the fourth sidewall having a limiting groove on the side facing the battery cell assembly; the tab bracket has two sides corresponding to the third sidewall and the fourth sidewall having edges protruding in a direction away from the battery cell assembly, and the edges are embedded in the limiting groove.

[0080] See Figure 8 and Figure 9 The third sidewall 56 and the fourth sidewall 57 of the housing 50 are, for example, two sidewalls along the thickness direction of the energy storage device, that is, two sidewalls perpendicular to the main body 22 of the electrode bracket 20. The side of these two sidewalls facing the cell assembly 40 is, for example, the inner side of the third sidewall 56 and the fourth sidewall 57. That is, a limiting groove 53 is provided at the position corresponding to the main body 22 on the inner side of the third sidewall 56 and the fourth sidewall 57. At the same time, the two sides of the main body 22 parallel to the thickness direction of the energy storage device extend away from the main body 22 to form an edge 25, and the edge 25 extends into the limiting groove 53. Thus, the limiting groove 53 and the edge 25 limit and fix the electrode bracket 20 and the housing 50, preventing the main body 22 from shaking within the housing 50.

[0081] Preferably, the limiting groove 53 extends along the width direction of the energy storage device, and the dimension of the limiting groove 53 in the width direction of the energy storage device is equal to or slightly smaller than the dimension of the main body 22 in that direction. Thus, in the width direction of the energy storage device, the limiting groove 53 can limit the entire main body 22 from top to bottom.

[0082] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0083] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features but not others included in other embodiments, combinations of features from different embodiments are intended to be within the scope of this invention and form different embodiments. For example, in the claims, any of the claimed embodiments can be used in any combination.

[0084] Those skilled in the art will understand that although the present invention has been described with reference to exemplary embodiments, various changes may be made and its elements may be replaced with equivalents without departing from the scope of the present invention. Furthermore, many modifications may be made to adapt particular situations or materials to the teachings of the present invention without departing from the essential scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed, but rather will include all embodiments falling within the scope of the appended claims.

Claims

1. An energy storage device, characterized in that, include: A battery cell assembly, comprising multiple cells stacked together; A support plate is disposed on the first side of the battery cell assembly; A circuit board is mounted on the side of the support plate opposite to the battery cell assembly. as well as A tab support is disposed on the second side of the battery cell assembly adjacent to the first side. The tab support includes a support body and a plurality of busbars disposed on the support body. The bracket body has a platform portion extending away from the battery cell assembly at one end near the support plate, and the circuit board and the support plate are detachably connected to the platform portion; The housing, the battery cell assembly, the support plate, the circuit board and the electrode bracket are all installed inside the housing, and the platform is connected to the housing.

2. The energy storage device according to claim 1, characterized in that, The circuit board includes a first conductive bus, the plurality of busbars include the first busbar, the platform portion is provided with a first fastener, the first fastener detachably connects and electrically connects the first conductive busbar and the first busbar; and / or The support plate includes a second conductive bus that is electrically connected to the circuit board. The plurality of busbars include the second busbar. The platform portion is provided with a second fastener, which detachably connects and electrically connects the second conductive busbar and the second busbar.

3. The energy storage device as described in claim 1, characterized in that, The platform section has two spaced-apart limiting baffles on its surface facing the support plate. The support plate has a limiting protrusion that extends between the two limiting baffles and is detachably connected to the platform section.

4. The energy storage device as described in claim 3, characterized in that, It also includes a third fastener, through which the limiting protrusion, the platform portion, and the housing are bolted together.

5. The energy storage device as described in claim 4, characterized in that, The housing includes a first sidewall, which is located on the same side of the battery cell assembly as the tab support. The first sidewall has a limiting recess, and a portion of the limiting protrusion extending beyond the two limiting baffles extends into the limiting recess; and / or... The housing also includes a second sidewall, which is located on the side of the battery cell assembly opposite to the first sidewall. The second sidewall is provided with a positioning pin, and the support plate is provided with a positioning pin hole, into which the positioning pin is inserted.

6. The energy storage device as described in claim 5, characterized in that, The plurality of busbars includes a first busbar and a second busbar electrically connected to the circuit board, and the two limiting baffles are located between the first busbar and the second busbar.

7. The energy storage device as described in claim 1, characterized in that, The support plate has multiple buckles on its periphery, and the periphery of the circuit board abuts against the multiple buckles.

8. The energy storage device according to claim 2, characterized in that, The first conductive busbar has a bent portion at one end near the circuit board; and / or, The support plate has a mounting cavity on the side away from the battery cell assembly. The second conductive bus is inserted into the mounting cavity, and one end of the second conductive bus near the tab bracket extends to the outside of the mounting cavity. The mounting cavity has an opening on the side away from the battery cell assembly, and the surface of the second conductive bus facing away from the battery cell assembly is at least partially exposed in the opening.

9. The energy storage device according to claim 1, characterized in that, The first side of the battery cell assembly is provided with structural adhesive, which is bonded to the support plate and the battery cell assembly respectively; and / or The third side of the battery cell assembly, opposite to the first side, is provided with structural adhesive, which is bonded to both the battery cell assembly and the bottom wall inside the housing.

10. The energy storage device according to claim 6, characterized in that, The housing includes a third sidewall and a fourth sidewall. The third sidewall is disposed opposite to each other and located between the first sidewall and the second sidewall. The third sidewall and / or the fourth sidewall is provided with a limiting groove on the side facing the battery cell assembly. The electrode bracket and the two sides corresponding to the third sidewall and / or the fourth sidewall are provided with edges that protrude away from the battery cell assembly, and the edges are embedded in the limiting groove.

Images