Energy storage device

Abstract

The utility model provides an energy storage device. The energy storage device comprises two battery modules and a shell. Each battery module comprises a module main body and a convergence terminal which are electrically connected; an accommodating cavity and a wiring cavity which are communicated with each other are formed in the shell; the containing cavity is located in the shell, and the wiring cavity is formed in the outer surface of the shell and communicated with the external space. The two module main bodies are positioned in the accommodating cavity; and the convergence terminals of the two battery modules are at least partially positioned in the wiring cavity. According to the technical scheme of the utility model, the wiring cavity and the accommodating cavity of the shell are respectively positioned inside and outside the shell, are separated from each other and are communicated with each other. During installation, operation can be directly carried out in the wiring cavity, the confluence terminal is connected with the conducting bar, the shell does not need to be disassembled, and installation and disassembly are convenient. In addition, the connection operation of the convergence terminal and the conducting bar occurs in the wiring cavity, so that the safety risk caused by damage to the battery module due to falling of mounting parts such as the conducting bar and a fastener into the accommodating cavity can be avoided.

Description

Technical Field

[0001] This utility model relates to the field of new energy, and in particular, to an energy storage device. Background Technology

[0002] Electric energy storage technology refers to the technology of storing electrical energy. In a power system, the generation and consumption of electrical energy occur simultaneously and are balanced in quantity. However, electricity consumption often fluctuates, and power supply equipment failures can also occur. Storing electrical energy can help cope with increases in electricity consumption and unexpected situations. Battery energy storage is one of the common energy storage methods.

[0003] With the development of lithium-ion battery technology, more and more home energy storage products have emerged in the new energy market. To meet the different electrical parameters and needs of users, energy storage devices typically adopt a structure of multiple battery modules connected in series or in parallel.

[0004] Existing energy storage devices suffer from inconvenient installation due to series or parallel connections between battery modules, and the risk of installation parts falling into the battery module's mounting cavity, posing a battery safety hazard. Utility Model Content

[0005] In view of this, the present invention provides an energy storage device that facilitates the series and parallel connection of multiple battery modules and can prevent mounting parts from falling into the mounting cavity.

[0006] This utility model provides an energy storage device comprising two battery modules and a housing. Each battery module includes an electrically connected module body and a bus terminal. The housing has an internally communicating receiving cavity and a wiring cavity. The receiving cavity is located within the housing, and the wiring cavity is formed on the outer surface of the housing and communicates with the external space. The two module bodies are located within the receiving cavities, and the bus terminals of both battery modules are at least partially located within the wiring cavities.

[0007] Alternatively or supplementarily, the module body includes a battery cell and a tab bracket, with the battery cell's tab passing through and fixed to the tab bracket. A bus terminal is located on the tab bracket and is electrically connected to the tab.

[0008] Alternatively or supplementarily, the tab holder includes a holder body and a support base. The support base is located on the side of the holder body away from the battery cell. The support base has a support recess, in which a nut is disposed. The nut engages with the support base to prevent rotation, and the bus terminal is partially located on one axial side of the nut. The support recess has an opening on the side away from the holder body. The inner surface of the support recess has a stop portion, which is closer to the opening than the nut in the direction away from the holder body, and the stop portion protrudes from the inner surface of the support recess. The inner surface of the support recess has two convex ribs spaced apart along the axial direction of the nut, with the nut located between the two convex ribs and abutting against them.

[0009] Alternatively or supplementarily, the housing is provided with two wiring cavities. The two wiring cavities include a first wiring cavity and a second wiring cavity. Each battery module includes two bus terminals. The two bus terminals include a positive bus terminal and a negative bus terminal. The positive bus terminal of one of the two battery modules is at least partially located in the first wiring cavity, and its negative bus terminal is at least partially located in the second wiring cavity. The negative bus terminal of the other of the two battery modules is at least partially located in the first wiring cavity, and its positive bus terminal is at least partially located in the second wiring cavity. A conductive bus is provided in the first wiring cavity, electrically connecting the positive and negative bus terminals within the first wiring cavity. A partition is provided in the second wiring cavity, with the positive and negative bus terminals located in the second wiring cavity respectively situated in two sub-cavities separated by the partition.

[0010] Alternatively or supplementarily, the housing includes a partition that divides the receiving cavity into a first receiving cavity and a second receiving cavity. Two battery modules are located within the first and second receiving cavities, respectively. The partition includes a first partition and a second partition that are interconnected. Two battery cells are arranged on opposite sides of the first partition. Two electrode tab supports are arranged on opposite sides of the second partition. The thickness of the second partition is less than the thickness of the first partition.

[0011] Alternatively or supplementally, the housing includes an upper housing and a lower housing. Each of the upper and lower housings has a recessed portion that is recessed into the other. The recessed portion includes a first recessed section and a second recessed section. Two first recessed sections cooperate to form a first partition, and two second recessed sections cooperate to form a second partition. The first recessed section has a plurality of reinforcing ribs spaced apart along its length.

[0012] Alternatively or supplementally, the thickness of the concave portion gradually decreases as it approaches the top of the concave portion.

[0013] Alternatively or supplementally, the energy storage device also includes a protective cover, which is detachably mounted on the housing to at least partially cover the wiring cavity.

[0014] Alternatively or supplementally, the protective cover has two pressing walls spaced apart along its length. Each pressing wall has two hooks, through which the protective cover is connected. The wiring cavity includes two pressing spaces, each located on the outer side of one of the pressing walls along its length.

[0015] Alternatively or supplementarily, the wiring cavity has two raised ribs on its sidewalls in the width direction. The two raised ribs are located on the outer sides of the two pressing walls in the length direction, and respectively abut against the two pressing walls.

[0016] According to the energy storage device provided in this embodiment of the present invention, the wiring cavity and the receiving cavity of the housing are located inside and outside the housing, respectively, separated from each other but connected. The main body of the battery module is located in the receiving cavity, while the bus terminal is at least partially located in the wiring cavity through the connection between the wiring cavity and the receiving cavity. During installation, the bus terminal can be connected to the busbar directly in the wiring cavity without disassembling the housing, which makes installation and disassembly convenient. In addition, since the connection operation between the bus terminal and the busbar occurs in the wiring cavity, which is separated from the receiving cavity, it can prevent the busbar and fasteners and other installation parts from falling into the receiving cavity and damaging the battery module, thus avoiding safety risks. Attached Figure Description

[0017] Figure 1 This is an exploded structural diagram of an energy storage device according to an embodiment of the present invention.

[0018] Figure 2 for Figure 1 A schematic diagram of the structure of the middle electrode support and battery unit.

[0019] Figure 3 This is a schematic diagram of a nut and electrode bracket structure according to an embodiment of the present invention.

[0020] Figure 4 This is a schematic diagram of a nut and tab bracket installation structure according to an embodiment of the present invention.

[0021] Figure 5 for Figure 4 A partial sectional view at point A in the middle.

[0022] Figure 6 for Figure 4 A partial sectional view at point B in the middle.

[0023] Figure 7 This is a schematic diagram of a lower housing structure according to an embodiment of the present invention.

[0024] Figure 8 for Figure 7 A schematic diagram of the local structure at point C.

[0025] Figure 9 This is a rear view structural diagram of an energy storage device according to an embodiment of the present invention.

[0026] Figure 10 This is a rear view structural schematic diagram of another energy storage device according to one embodiment of the present invention.

[0027] Figure 11 for Figure 10 A schematic diagram of the localized explosion structure at point D.

[0028] Figure 12 This is a bottom-view perspective view of an energy storage device according to an embodiment of the present invention.

[0029] Figure 13 for Figure 12 A schematic diagram of the local structure at point E in the middle.

[0030] Figure 14 This is a bottom-view perspective view of another energy storage device according to one embodiment of the present invention.

[0031] Figure 15 for Figure 14 A schematic diagram of the localized explosion structure at point F in the middle.

[0032] Figure 16 for Figure 15 A schematic diagram of the structure after removing the protective cover.

[0033] Figure 17 for Figure 14 A schematic diagram of the local structure at point F.

[0034] Figure 18 This is a three-dimensional structural diagram of an energy storage device according to an embodiment of the present invention.

[0035] Figure 19 This is a bottom view of an energy storage device according to an embodiment of the present invention.

[0036] Figure 20 for Figure 19 A schematic diagram of the local structure at point G.

[0037] Figure label:

[0038] 100. Energy storage devices;

[0039] 10. Battery module; 10a. First battery module; 10b. Second battery module; 11. Bus terminal; 11a. Positive bus terminal; 11b. Negative bus terminal; 12. Module body; 120. Terminal tab bracket; 121. Support base; 1211. Stop part; 1212. Opening side; 1213. Protruding part; 1214. Support recess; 122. Bracket body; 123. Battery cell;

[0040] 20. Housing; 21. Receiving cavity; 211. First receiving cavity; 212. Second receiving cavity; 22. Wiring cavity; 22a. First wiring cavity; 22b. Second wiring cavity; 23. Divider; 231. First divider; 232. Second divider; 24. Upper housing; 25. Lower housing; 26. Pressing space; 27. Partition; 28. Recess; 28a. First recessed section; 28b. Second recessed section; 29. ​​Reinforcing rib.

[0041] 30. Nut; 40. Bolt; 50. Conductive busbar; 60. Protective cover; 61. Pressing wall; 611. Hook; 70. Rib. Detailed Implementation

[0042] Numerous specific details are set forth below to provide an understanding of the structure, function, and use of the embodiments described and illustrated in the specification and figures. It is to be understood that the embodiments described and illustrated herein are non-limiting examples, and thus it will be appreciated that the particular structural and functional details disclosed herein are representative and exemplary. Variations and changes may be made to these embodiments without departing from the scope of the claims.

[0043] As mentioned earlier, to meet the different electrical parameters and needs of users, energy storage devices typically employ a series or parallel connection of multiple battery modules. Existing energy storage devices usually connect each battery module in series or parallel within the device's casing, and then connect them to external circuits via busbars (e.g., current-carrying plates). This installation method presents challenges such as inconvenient installation and disassembly, lack of flexibility in adapting to workflow arrangements, and the risk of installation parts falling into the battery module's mounting cavity, posing a battery safety hazard.

[0044] To address the aforementioned problems, this utility model provides an energy storage device. The following, in conjunction with… Figures 1 to 20 The energy storage device 100 provided by this utility model will be described.

[0045] It should be understood that there are many ways to implement this utility model, and it should not be interpreted as being limited to the embodiments described below. The embodiments described herein are only for a more thorough and clear understanding of this utility model.

[0046] See Figure 1 The energy storage device 100 may include two battery modules 10 and a housing 20. Each battery module 10 may include an electrically connected module body 12 and a bus terminal 11. The housing 20 has a receiving cavity 21 and a wiring cavity 22 that are in communication with each other. The receiving cavity 21 is located inside the housing 20, and the wiring cavity 22 is formed on the outer surface of the housing 20 and communicates with the external space; that is, the receiving cavity 21 and the wiring cavity 22 can be separated. The two module bodies 12 are located inside the receiving cavity 21, and the bus terminals 11 of the two battery modules 10 are at least partially located inside the wiring cavity 22.

[0047] According to the energy storage device 100 provided in this embodiment of the present invention, the wiring cavity 22 and the receiving cavity 21 of the housing 20 are located inside and outside the housing, respectively, separated from each other and connected to each other. The module body 12 of the battery module 10 is located in the receiving cavity 21, and the bus terminal 11 is located at least partially in the wiring cavity 22 through the connection between the wiring cavity 22 and the receiving cavity 21. During installation, the bus terminal 11 can be connected to the busbar directly in the wiring cavity 22 without disassembling the housing 20, which makes installation and disassembly more convenient. In addition, since the connection operation between the bus terminal 11 and the busbar occurs in the wiring cavity 22, and the wiring cavity 22 is separated from the receiving cavity 21, it is possible to avoid the safety risk of the busbar and fasteners falling into the receiving cavity 21 and damaging the battery module 10.

[0048] It is understood that in this document, the separation of the receiving cavity 21 and the wiring cavity 22 does not necessarily mean that the receiving cavity 21 and the wiring cavity 22 are absolutely isolated from each other, but can mean that the receiving cavity 21 and the wiring cavity 22 are separated by a wall located between them, so that the mounting parts will not fall from the wiring cavity 22 into the receiving cavity 21.

[0049] refer to Figure 2 The module body 12 may include a tab bracket 120 and a battery unit 123. The tabs of the battery unit 123 pass through the tab bracket 120 and are fixed on the tab bracket 120, and the bus terminal 11 is electrically connected to the tabs.

[0050] For example, the battery cell 123 may include a plurality of stacked battery cells. The electrical connection between the plurality of battery cells to form an electrical connection between the plurality of battery cells is the same as in the past and will not be described in detail here.

[0051] refer to Figures 3 to 6 The tab holder 120 may include a holder body 122 and a support base 121. The support base 121 is located on the side of the holder body 122 away from the battery cell 123. The support base 121 has a support recess 1214, in which a nut 30 is provided. The nut 30 is anti-rotationally engaged with the support base 121, and the bus terminal 11 is partially located on one axial side of the nut 30. The inner side of the support recess 1214 has two protruding ribs 1213 (e.g., ribs) spaced apart along the axial direction of the nut 30. The nut 30 is located between the two protruding ribs 1213 and abuts against the two protruding ribs 1213.

[0052] In the above description, the anti-rotation engagement between nut 30 and support base 121 can be understood as follows: after nut 30 is installed in support base 121, the engagement between support base 121 and nut 330 prevents nut 30 from rotating relative to support base 121. For example, the portion of nut 30 located in support base 121 can be polygonal, such as hexagonal. This portion can have two opposing sides that abut against the two side walls of support base 121 to achieve anti-rotation of nut 30. Nut 30 can be configured to connect with bolt 40 to electrically connect the conductor bar to bus terminal 11. In this way, nut 30 can be easily installed onto support base 121 without injection molding the two together, which helps simplify the manufacturing process and reduce manufacturing costs.

[0053] The nut 30 is anti-rotatingly positioned within the support 121 to prevent it from rotating and hindering connection when connected to the bolt 40. It is understood that the nut 30 can be replaced by a bolt, and correspondingly, the bolt 40 can be replaced by a nut. During connection, the bolt 40 can pass through the holes on the busbar and the bus terminal 12 and be threaded onto the nut 30, thereby achieving electrical connection between the busbar and the bus terminal 12.

[0054] Continue to refer to Figures 3 to 6 The inner side of the bus terminal 13 is provided with a protruding stop portion 1211, such as a stop protrusion. The stop portion 1211 is closer to the opening side 1212 than the nut 30 to prevent the nut 30 from moving towards the opening side 1212. The presence of the stop portion 1211 can prevent the nut 30 from accidentally coming out of the support base 121.

[0055] The support base 121 is open in the connection direction of the nut 30 and the bolt 40. The inner surface of the support base 121 has two protruding portions 1213 (e.g., ribs) spaced apart in the connection direction (i.e., the axial direction of the nut 30). At least a portion of the nut 30 is located between the two protruding portions 1213, so that the two protruding portions 1213 prevent the nut 30 from moving along the connection direction. This achieves both an opening in the connection direction of the nut 30 and the bolt 40 for easy connection and disengagement, and positioning of the nut 30 in the connection direction. Furthermore, during the insertion of the nut 30 into the support base 121, the two protruding portions 1213 guide the nut 30 into place.

[0056] It should be noted that the connection direction of nut 30 and bolt 40 can refer to the relative direction of movement between the two during the connection process. For example, the connection direction can refer to the axial direction of the bolt or nut.

[0057] Return to reference Figure 1The housing 20 may have two wiring cavities 22, namely a first wiring cavity 22a and a second wiring cavity 22b. For example, the two wiring cavities 22 may be located on opposite sides in the thickness direction of the housing 20. Each battery module 10 may include two bus terminals 11, namely a positive bus terminal 11a and a negative bus terminal 11b. The two battery modules 10 may include a first battery module 10a and a second battery module 10b.

[0058] One of the two battery modules 10 may have its positive bus terminal 11a at least partially located within the first wiring cavity 22a, and its negative bus terminal 11b at least partially located within the second wiring cavity 22b. The other battery module 10 may have its negative bus terminal 11b at least partially located within the first wiring cavity 22a, and its positive bus terminal 11a at least partially located within the second wiring cavity 22b. A conductive bus 124 is provided within the first wiring cavity 22a, electrically connecting the positive bus terminal 11a and the negative bus terminal 11b within the first wiring cavity 22a.

[0059] The second wiring cavity 22b is provided with a partition 27. The positive bus terminal 11a and the negative bus terminal 11b located in the second wiring cavity 22b are respectively located in two sub-cavities separated by the partition 27, so as to avoid short circuit between them.

[0060] For example, the positive bus terminal 11a of the first battery module 10a and the negative bus terminal 11b of the second battery module 10b may be at least partially located in the first wiring cavity 22a, and the negative bus terminal 11b of the first battery module 10a and the positive bus terminal 11a of the second battery module 10b may be at least partially located in the second wiring cavity 22b. The negative bus terminal 11b of the first battery module 10a and the positive bus terminal 11a of the second battery module 10b are respectively located in two sub-cavities separated by the partition 23.

[0061] In the first wiring cavity 22a, the positive bus terminal 11a of the first battery module 10a and the negative bus terminal 11b of the second battery module 10b are connected together through the conductive bus 50 to realize the series connection of the two battery modules 10.

[0062] In the second wiring cavity 22b, the energy storage device 100 may include two lead wires, both of which extend into the wiring cavity 22 and are respectively connected to the first battery module 10a and the second battery module 10b for easy management of the two battery modules 10.

[0063] It should be noted that, in this document, the term "wiring cavity 22" refers collectively to the first wiring cavity 22a and the second wiring cavity 22b. When referring to either the first wiring cavity 22a or the second wiring cavity 22b without distinction, it is called wiring cavity 22. The wiring cavity 22 and its associated structures will be illustrated below. The wiring cavity 22 described below can refer to either the first wiring cavity 22a or the second wiring cavity 22b. It should also be noted that, in some prospective examples of this invention, the housing 20 may also have only one wiring cavity 22.

[0064] refer to Figure 1 , Figure 7 and Figure 8 In one example, the distance between the two battery cells 123 of the two battery modules 10 is greater than the distance between the two tab supports 120 of the two battery modules 10.

[0065] The spacing between the two tab supports 120 is smaller than the spacing between the two battery cells 123 of the two battery modules 10, meaning the spacing between the bus terminals 11 is smaller. This reduces the size of the wiring cavity 22 and the bus terminals 13. Reducing the size of the wiring cavity 22 facilitates installation while preventing an excessively large wiring cavity 22 from weakening the strength of the housing 20. The smaller size of the bus terminals 13 saves space within the housing 20, thereby increasing the energy density of the battery module 10.

[0066] Continue to refer to Figure 1 The housing 20 may have a partition 23, which can divide the receiving cavity 21 into a first receiving cavity 211 and a second receiving cavity 212. The two battery modules 10 can be located in the first receiving cavity 211 and the second receiving cavity 212, respectively.

[0067] It is understandable that other numbers of battery modules 10 can be set according to the needs of specific application scenarios, such as three, four, five, six or seven, and the number of housing cavities 21 can be adjusted accordingly.

[0068] refer to Figure 7 and Figure 8 The partition 23 (e.g., a partition plate) may include a first partition 231 (e.g., a first partition plate) and a second partition 232 (e.g., a second partition plate) connected to each other. Two battery cells 123 are arranged on both sides of the first partition 231, and two electrode tab supports 120 are arranged on both sides of the second partition 232. The thickness of the second partition 232 may be less than the thickness of the first partition 231. Exemplarily, a stepped structure may be formed at the junction of the two.

[0069] In this way, the first partition 231 can be adapted to the spacing of the bus terminal 11, which can prevent the battery from shaking and contacting, improve the safety of the energy storage device 100, and at the same time improve the structural strength.

[0070] Next, refer to Figure 1 The housing 20 may include an upper housing 24 and a lower housing 25 assembled together.

[0071] The receiving cavity 21 can be formed entirely on the upper shell 24 or the lower shell 25, or it can be partially formed on the upper shell 24 and partially formed on the lower shell 25.

[0072] The two wiring cavities 22 can be respectively located at the front center of the upper housing 24 and the front center of the lower housing 25. It should be noted that the wiring cavities 22 can also be located in other suitable positions, such as the rear center of the upper housing 24 and the rear center of the lower housing 25. It should also be noted that in other examples, the housing 20 can be integrally formed, or it can comprise multiple housing parts.

[0073] For example, the first wiring cavity 22a is located on the lower housing 25, and the second wiring cavity 22b is located on the upper housing. Of course, the positions of the two can be interchanged according to the needs of specific application scenarios.

[0074] refer to Figures 7 to 20 The housing 20 may include an upper housing 24 and a lower housing 25. Each of the upper housing 24 and the lower housing 25 may be provided with a recess 28 (e.g., an inner groove) that is recessed into the other, that is, the upper housing 24 and the lower housing 25 are respectively provided with a recess 28.

[0075] The recessed portion 28 may include a first recessed segment 28a (e.g., a first recessed groove) and a second recessed segment 28b (e.g., a second recessed groove). The two first recessed segments 28a cooperate to form the aforementioned first partition 231, and the two second recessed segments 28b cooperate to form the aforementioned second partition 232.

[0076] For example, the thickness of the recess 28 gradually decreases as it approaches the top of the recess 28, that is, the cross-sectional area of ​​the recess 28 gradually increases along the direction perpendicular to the top to the bottom of the recess 28.

[0077] This facilitates demolding during injection molding while ensuring the strength of the partition 23.

[0078] For example, the first concave section 28a may be provided with a plurality of reinforcing ribs 28 spaced apart along its length.

[0079] This can further improve the structural strength of the recessed portion 28, thereby improving the structural strength of the entire energy storage device 100.

[0080] refer to Figures 10 to 20 The energy storage device 100 may also include a protective cover 60, which may be detachably mounted on the housing 20 to at least partially cover the wiring cavity 22. The protective cover 60 on the wiring cavity 22 can cover the exposed parts after the bus terminal 11 is connected in series or connected to an external circuit to prevent debris from falling into the exposed parts and causing safety hazards.

[0081] The protective cover 60 may have two pressing walls 61, which may be spaced apart along the length of the protective cover 60. (See reference) Figure 13 Two pressing walls 61 can be provided at both ends of the protective cover 60 along its length. Each of the two pressing walls 61 can be provided with two hooks 611, which can be located at the bottom of the two pressing walls 61 respectively. The protective cover 60 is connected to the protective cover 60 through the two hooks 611.

[0082] By pressing the two pressing walls 61, the protective cover 60 can be easily installed in the wiring cavity 22, making it easy to remove the protective cover 60. Moreover, the two hooks 611 provided at the ends of the two pressing arms can be engaged in the wiring cavity 22 after the protective cover 60 is installed in place, preventing the protective cover 60 from falling off.

[0083] Continue to refer to Figures 10 to 20 The wiring cavity 22 may include two pressing spaces 26, which may be located on the outer side of the two pressing walls 61 in the length direction.

[0084] The two pressing spaces 26 of the wiring cavity 22 can be used as operating spaces for installing and removing the protective cover 60, allowing for convenient installation and removal of the protective cover 60 at this location.

[0085] refer to Figure 16 In one example, the wiring cavity 22 has two raised ribs 70 on its sidewalls in the width direction. The two raised ribs 70 are located on the outer side of the two pressing walls 61 in the length direction and abut against the two pressing walls 61 respectively. Providing two raised ribs 70 in the width direction of the wiring cavity 22 can improve the structural strength of the housing 20 and also serve as a stop and protection cover 60.

[0086] The following is combined Figures 1 to 20 The installation process of the energy storage device 100 of the present invention will be described below, along with a preferred embodiment of the present invention.

[0087] refer to Figures 1 to 20During installation, the tabs of the battery cells 123 in the two battery modules 10 can be supported in the tab bracket 120 to form a bus terminal 11. The bus terminal 11 for series connection is partially located in the wiring cavity 22 of the lower housing 25. The bus terminal 11 for connection to external circuits is partially located in the wiring cavity 22 of the upper housing 24. The arrangement of the tabs in the tab bracket 120 and the formation of the bus terminal 13 are conventional and will not be described further. Then, the two battery modules 10 are respectively placed into the first receiving cavity 211 of the housing 20. The two battery cells 123 are separated by the first partition 231, and the two tab brackets 120 are separated by the second partition 232.

[0088] The positive bus terminal 11a of one battery module 10 and the negative bus terminal 11b of another battery module 10 located in the first wiring cavity 22a of the lower housing 25 can be connected in series by bolts 40 through the through holes on the conductive busbar 50 and the bus terminal 13 and screwed to the nut 30. The negative bus terminal 112 of one battery module 10 and the positive bus terminal 111 of another battery module 10 in the second wiring cavity 22b of the upper housing 24 can be electrically connected to achieve connection with the external circuit.

[0089] It should be understood that the term "comprising" and its variations used in the embodiments of this utility model are open-ended, meaning "including but not limited to". The term "according to" means "at least in part according to". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least another embodiment". The term "a plurality of" means "more than one", which implies covering two, three or more cases.

[0090] It should be understood that although terms such as "first" or "second" may be used in embodiments of the present invention to describe various elements, such as a first receiving cavity and a second receiving cavity, these elements are not defined by these terms, which are only used to distinguish one element from another.

[0091] The protection scope of this utility model embodiment is not limited to the above embodiments. Any variations or substitutions that can be conceived by those skilled in the art within the technical scope disclosed in this utility model embodiment should be included within the protection scope of this utility model embodiment. Therefore, the protection scope of this utility model embodiment should be determined by the protection scope of the claims.

Claims

1. An energy storage device, characterized in that, include: Two battery modules, each of which includes an electrically connected module body and a bus terminal; A housing having an interconnected receiving cavity and a wiring cavity, the receiving cavity being located within the housing, and the wiring cavity being formed on the outer surface of the housing and communicating with an external space; and The two module bodies are located within the receiving cavity, and the bus terminals of the two battery modules are at least partially located within the wiring cavity.

2. The energy storage device according to claim 1, characterized in that, The module body includes a battery unit and a tab bracket. The tabs of the battery unit pass through the tab bracket and are fixed on the tab bracket. The bus terminal is disposed on the tab bracket and is electrically connected to the tab.

3. The energy storage device according to claim 2, characterized in that, The tab bracket includes a bracket body and a support base. The support base is located on the side of the bracket body away from the battery cell. The support base has a support recess, and a nut is provided in the support recess. The nut is anti-rotationally engaged with the support base. The bus terminal is partially located on the axial side of the nut. The support recess has an opening on the side away from the bracket body, and a stop is provided on the inner side of the support recess. The stop is closer to the opening than the nut in the direction away from the bracket body, and the stop protrudes from the inner side of the support recess; and The inner side of the support recess is provided with two protruding strips arranged at intervals along the axial direction of the nut. The nut is located between the two protruding strips and abuts against the two protruding strips.

4. The energy storage device according to claim 1, characterized in that, The housing is provided with two wiring cavities, the two wiring cavities being a first wiring cavity and a second wiring cavity; Each of the battery modules includes two bus terminals, the two bus terminals including a positive bus terminal and a negative bus terminal; the positive bus terminal of one of the two battery modules is at least partially disposed in the first wiring cavity, and its negative bus terminal is at least partially disposed in the second wiring cavity; The negative bus terminal of the other battery module of the two battery modules is at least partially disposed within the first wiring cavity, and its positive bus terminal is at least partially disposed within the second wiring cavity; a conductive bus is provided within the first wiring cavity, the conductive bus electrically connecting the positive bus terminal and the negative bus terminal within the first wiring cavity; and The second wiring cavity is provided with a partition, and the positive bus terminal and the negative bus terminal located in the second wiring cavity are respectively located in two sub-cavities separated by the partition.

5. The energy storage device according to claim 2, characterized in that, The housing is provided with a partition, which divides the receiving cavity into a first receiving cavity and a second receiving cavity, and the two battery modules are respectively located in the first receiving cavity and the second receiving cavity; The partition includes a first partition and a second partition that are connected to each other. Two battery cells are arranged on both sides of the first partition, and two electrode brackets are arranged on both sides of the second partition. The thickness of the second partition is less than the thickness of the first partition.

6. The energy storage device according to claim 5, characterized in that, The housing includes an upper housing and a lower housing. Each of the upper housing and the lower housing has a recessed portion that is recessed into the other. The recessed portion includes a first recessed section and a second recessed section. The two first recessed sections cooperate to form a first partition, and the two second recessed sections cooperate to form a second partition. The first recessed section has a plurality of reinforcing ribs arranged at intervals along its length.

7. The energy storage device according to claim 6, characterized in that, The thickness of the concave portion gradually decreases as it approaches the top of the concave portion.

8. The energy storage device according to claim 1, characterized in that, It also includes a protective cover, which is detachably mounted on the housing to at least partially cover the wiring cavity.

9. The energy storage device according to claim 8, characterized in that, The protective cover has two pressing walls that are spaced apart in the length direction. Each pressing wall has two hooks. The protective cover is connected to the protective cover through the two hooks. The wiring cavity includes two pressing spaces that are located on the outer side of the two pressing walls in the length direction.

10. The energy storage device according to claim 9, characterized in that, The wiring cavity has two protruding ribs on its sidewall in the width direction. The two protruding ribs are located on the outer side of the two pressing walls in the length direction and abut against the two pressing walls respectively.

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