Battery assembly and energy storage device

Abstract

The utility model discloses a battery assembly and an energy storage device, the battery assembly comprises a plurality of batteries, the plurality of batteries are opposite in the length direction, the first end of the former battery is opposite to the second end of the latter battery, the first end is provided with a first pole, the second end is provided with a second pole, and the first pole and the second pole are opposite to each other. And the first pole columns and the second pole columns of the adjacent batteries are directly or indirectly inserted and matched, so that the structural connection and the electric connection of the adjacent batteries are realized. Therefore, on one hand, structural connection is realized through insertion matching, the assembly difficulty of the battery assembly can be reduced, the assembly efficiency can be improved, the welding step can be omitted, the assembly efficiency is further improved, and the production cost is reduced; and on the other hand, the space occupation of the connecting piece between the adjacent batteries is small, the space utilization rate of the battery assembly can be improved, the energy density is improved, the length of a single battery is short, the energy efficiency can be ensured, and the energy efficiency and the space utilization rate are both considered.

Description

Technical Field

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

[0002] In the related technologies, batteries have excellent safety performance and structural strength, and have been increasingly widely used in the field of energy storage technology.

[0003] However, the length of the battery is positively correlated with its space utilization. The longer the length, the lower the space utilization, and the shorter the length, the lower the space utilization. At the same time, the length of the battery is negatively correlated with its energy efficiency. The lower the length, the higher the energy efficiency, and the longer the length, the lower the energy efficiency. It is difficult to take both the energy efficiency and space utilization of the battery into account. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a battery assembly, which can take into account both energy efficiency and space utilization and effectively improve energy density.

[0005] The utility model further proposes an energy storage device using the battery assembly.

[0006] According to the battery assembly of the first aspect of the utility model, the battery assembly includes: a plurality of batteries and a connector, wherein the plurality of batteries are opposite to each other in the length direction, and the first end of the preceding battery is opposite to the second end of the succeeding battery, a first pole is arranged on the first end, and a second pole is arranged on the second end, and the first pole and the second pole of adjacent batteries are directly or indirectly plugged into each other to realize the structural connection and electrical connection of adjacent batteries.

[0007] According to the battery assembly of the embodiment of the utility model, a plurality of batteries are arranged in sequence in the length direction, and the first end and the second end are directly or indirectly plugged together. On the one hand, the structural connection is achieved through plug-in cooperation, which can reduce the difficulty of assembling the battery assembly and improve the assembly efficiency. The electrical connection of adjacent batteries can be achieved without welding, and the welding step can be omitted, which can further improve the assembly efficiency and reduce the production cost. On the other hand, the overall length of the battery assembly is longer, and the space occupied by the connectors between adjacent batteries is smaller, which can improve the space utilization of the battery assembly and improve the energy density. The length of a single battery is shorter, which can ensure energy efficiency, so as to take into account both energy efficiency and space utilization.

[0008] According to some embodiments of the utility model, it also includes: a connector, the first end and the second end of adjacent batteries are indirectly plugged together, the connector includes: a main body and an insulating part sleeved outside the main body, the first plug-in part and the second plug-in part are provided on the main body, the first plug-in part is plug-fitted with the first pole, and the second plug-in part is plug-fitted with the second pole.

[0009] Furthermore, a collecting boss is provided on the main body, and the collecting boss extends out of the insulating portion and is exposed.

[0010] Furthermore, a first mounting hole is provided on the main body, the first mounting hole is provided corresponding to the first plug-in portion and the second plug-in portion, and is suitable for fixing the first pole and the second pole by a fastener matched with the first mounting hole.

[0011] According to some embodiments of the utility model, it also includes: a first connecting block and a second connecting block, the first end and the second end of adjacent batteries are directly plugged together, the first connecting block is integrated with the first end, the second connecting block is integrated with the second end, and the first connecting block is provided with a second plug-in portion, the second connecting block is provided with a first plug-in portion, the first plug-in portion is plug-fitted with the first pole, and the second plug-in portion is plug-fitted with the second pole.

[0012] Furthermore, the battery assembly further includes: a first insulating layer, wherein the first insulating layer is coated on a connection area between the first end and the second end.

[0013] Furthermore, a first avoidance hole is provided on the first insulating layer, a collecting boss is formed on the connecting member, and the collecting boss extends out of the first avoidance hole.

[0014] Furthermore, the first connecting block is provided with a second mounting hole corresponding to the second plug-in portion, and the second connecting block is provided with a third mounting hole corresponding to the first plug-in portion, and is suitable for fixing the first pole and the second pole respectively by fasteners cooperating with the second mounting hole or the third mounting hole.

[0015] According to some embodiments of the present invention, the first pole and the second pole are opposite to each other in the width direction and / or the height direction.

[0016] The energy storage device according to the embodiment of the second aspect of the utility model includes: at least one group of battery assemblies described in the above embodiment.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 is a schematic diagram of a battery assembly according to a first embodiment of the utility model;

[0020] Figure 2 is another schematic diagram of a battery assembly according to the first embodiment of the utility model;

[0021] Figure 3 is a cross-sectional schematic diagram of a battery assembly according to a first embodiment of the utility model;

[0022] Figure 4 is a schematic diagram of a battery assembly according to a second embodiment of the utility model;

[0023] Figure 5 is another schematic diagram of a battery assembly according to a second embodiment of the utility model;

[0024] Figure 6 is a cross-sectional schematic diagram of a battery assembly according to a second embodiment of the utility model;

[0025] Figure 7 is a schematic diagram of a battery assembly according to a third embodiment of the utility model;

[0026] Figure 8 is another schematic diagram of a battery assembly according to a third embodiment of the utility model;

[0027] Fig. 9 is a partial enlarged schematic diagram of a battery assembly according to a third embodiment of the utility model;

[0028] Fig.10 Schematic diagram of a battery assembly according to a fourth embodiment of the present invention.

[0029] Reference numerals:

[0030] The battery assembly 100,

[0031] Battery 10, first end 11, first pole 111, second end 12, second pole 121,

[0032] Connecting piece 20 , first plug-in portion 201 , second plug-in portion 202 , body 21 , first mounting hole 211 , insulating portion 22 , collecting boss 23 , first insulating layer 24 , first connecting block 25 , second mounting hole 251 , second connecting block 26 . DETAILED DESCRIPTION

[0033] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0034] Reference below Figure 1-Figure 10 A battery assembly 100 and an energy storage device according to an embodiment of the present invention are described.

[0035] like Figure 1 , Figure 4 , Figure 7 and Fig.10 As shown, the battery assembly 100 according to the embodiment of the first aspect of the utility model includes: a plurality of batteries 10 and a connector 20. The plurality of batteries 10 are relatively arranged in the length direction to make the total length of the battery assembly 100 longer. The longer length corresponds to a higher space utilization rate, and the adjacent batteries 10 can be connected by the connector 20. The length of each individual battery 10 does not need to be set too long. The length of each individual battery 10 is more reasonable, and the energy efficiency of each battery 10 can also be maintained at a high level, thereby ensuring the energy density of the battery 10.

[0036] It should be pointed out that in the prior art, blade batteries have been increasingly widely used in the field of energy storage due to their excellent safety performance and structural strength. Batteries 10 can be divided into short blades (battery 10 length ≤ 600mm) and long blades (battery 10 length ≥ 600mm) according to their length. For long blade batteries, their space utilization is high but their efficiency is low when the system space is arranged. For short blade batteries, their efficiency is high but their space utilization is low.

[0037] Based on this, the present invention proposes a battery assembly 100, wherein a plurality of batteries 10 are electrically connected along the length direction (eg Figure 1 , Figure 4 , Figure 7 and Fig.10 The two shown, Figure 2 , Figure 5 and Figure 8 3 or more as shown), and the first end 11 of the previous battery 10 is opposite to the second end 12 of the next battery 10, the first end 11 is provided with a first pole 111, and the second end 12 is provided with a second pole 121, the polarity of the first pole 111 and the second pole 121 are the same or different, and the first end 11 and the second end 12 of the adjacent batteries 10 are directly or indirectly plugged in to achieve structural connection or electrical connection of the adjacent batteries 10.

[0038] Among them, the direct or indirect plug-in fit between the first end 11 and the second end 12 can be that a plug-in structure is formed on both the first end 11 and the second end 12, and the two are directly plug-in fit, or a connector 20 is arranged between the first end 11 and the second end 12, and has a first plug-in portion 201 and a second plug-in portion 202, the first plug-in portion 201 is connected to the first pole 111, and the second plug-in portion 202 is connected to the second pole 121, so as to realize the structural connection and electrical connection of adjacent batteries 10.

[0039] It can be understood that structural connection refers to the fixation of the front battery 10 and the rear battery 10 through the plug-in structure, and the fixation is achieved by plug-in matching. While ensuring the connection strength, it can reduce the difficulty of assembly and improve the assembly efficiency. Electrical connection refers to the conduction between the front battery 10 and the rear battery 10 through the plug-in structure, and the series or parallel connection of the front battery 10 and the rear battery 10 are achieved. There is no need to use welding to achieve the electrical connection between the poles, which can also improve production efficiency and reduce production costs.

[0040] More importantly, multiple batteries 10 are arranged in sequence in the length direction to form a longer battery assembly 100. The battery assembly 100 is longer and the plug-in structure between adjacent batteries 10 occupies less space, which can ensure the space utilization of the battery assembly 100 to improve the energy density of the entire energy storage device. The length of each individual battery 10 is shorter, so the energy efficiency of the battery 10 can be taken into account.

[0041] For example, it is defined that in the adjacent batteries 10, the first one in the length direction is the first battery, and the second one in the length direction is the second battery. The connector 20 can be provided separately, that is, it is independent of the first battery and the second battery, and is provided between the first battery and the second battery, and a first plug-in portion 201 and a second plug-in portion 202 are formed thereon, which are respectively plugged with the first pole 111 of the first battery and the second pole 121 of the second battery (see Figure 1-Figure 3 The first embodiment shown, Figure 4-Figure 6 The second embodiment shown).

[0042] Alternatively, the connection structure is integrated on the first end 11 or the second end 12 (see Figure 7-Figure 9 The third embodiment shown, Fig.10 In the fourth embodiment shown in the figure, the first end 11 and the second end 12 both have an integrated connection structure, and have a first plug-in portion 201 and a second plug-in portion 202, the first plug-in portion 201 is plug-fitted with the first pole 111, and the second plug-in portion 202 is plug-fitted with the second pole 121, so that adjacent batteries 10 are structurally connected and electrically connected.

[0043] According to the battery assembly 100 of the embodiment of the utility model, multiple batteries 10 are arranged in sequence in the length direction, and the first end 11 and the second end 12 are directly or indirectly plugged together. On the one hand, the structural connection is achieved through plug-in cooperation, which can reduce the difficulty of assembling the battery assembly 100 and improve the assembly efficiency. The electrical connection between adjacent batteries 10 can be achieved without welding, and the welding step can be omitted, which can further improve the assembly efficiency and reduce the production cost. On the other hand, the overall length of the battery assembly 100 is longer, and the space occupied by the connector 20 between adjacent batteries 10 is smaller, which can improve the space utilization of the battery assembly 100 and improve the energy density. The length of a single battery 10 is shorter, which can ensure energy efficiency, so as to take into account both energy efficiency and space utilization.

[0044] It should be pointed out that when the battery assembly 100 includes more than three batteries 10, the two batteries 10 located at the two ends in the length direction are defined as end batteries, and one or more batteries 10 in the middle area are defined as intermediate batteries. The battery 10 includes a battery 10 end face, a battery 10 large face and a battery 10 small face, and a pressure relief valve cannot be set on the battery 10 end face of the intermediate battery, but the corresponding pressure relief valve can be set on the battery 10 small face or the battery 10 large face.

[0045] Below, the structure of the battery assembly 100 of the embodiment of the utility model is described in detail with four specific embodiments. However, those skilled in the art should understand that the further explanation of the structure of the battery 10 in the utility model is to facilitate the understanding of the technical solution, rather than an exhaustive description of the optional structural forms of the utility model.

[0046] First embodiment:

[0047] like Figure 1-Figure 6 As shown, according to some embodiments of the utility model, the battery assembly 100 also includes: a connector 20 that indirectly plugs and cooperates with the first end 11 and the second end 12 of the adjacent battery 10, the connector 20 includes: a main body 21 and an insulating part 22 sleeved on the outside of the main body 21, a first plug-in part 201 and a second plug-in part 202 are provided on the main body 21, the first plug-in part 201 is plug-fitted with the first pole 111, and the second plug-in part 202 is plug-fitted with the second pole 121.

[0048] Specifically, in the first and second embodiments, the connector 20 is constructed as a rectangular block and is separately provided on the battery 10, the main body 21 is constructed as a metal conductive structure and a plug-in slot is provided thereon, one plug-in slot is defined as a first plug-in portion 201, and the other plug-in slot is defined as a second plug-in portion 202, the first pole 111 is inserted into the first plug-in portion 201, and the second pole 121 is inserted into the second plug-in portion 202, so as to simultaneously realize structural connection and electrical connection, that is, indirect plug-in cooperation between the first end 11 and the second end 12, and an insulating portion 22 is arranged outside the main body 21, which can also realize insulation protection and improve the safety and reliability during the assembly process and use.

[0049] See also Figure 3 and Figure 6 As shown, a collecting boss 23 is provided on the body 21 , and the collecting boss 23 extends out of the insulating portion 22 and is exposed.

[0050] Therefore, a collecting boss 23 is provided on the connector 20. The collecting boss 23 can protrude from the top surface or the side surface of the connector 20, and the collecting boss 23 has the same potential as the first pole 111 and the second pole 121, and can be used for collecting electrical signals, so as to facilitate the arrangement of the wiring harness and sensors for collecting signals, reduce the difficulty of arrangement, and improve space occupancy.

[0051] Second embodiment:

[0052] like Figure 4 , Figure 5 and Figure 6 As shown, the difference between the second embodiment and the first embodiment is that a first mounting hole 211 is further provided, and threaded fastening of the connector 20 with the first pole 111 or the second pole 121 is achieved through the first mounting hole 211, that is, a first mounting hole 211 is provided on the main body 21, and the first mounting hole 211 is provided corresponding to the first plug-in portion 201 and the second plug-in portion 202, and is suitable for fixing the first pole 111 and the second pole 121 by a fastener matching the first mounting hole 211, thereby improving the structural stability and reliability of the battery assembly 100.

[0053] Third embodiment:

[0054] See also Figure 7 , Figure 8 and 9As shown, according to some embodiments of the utility model, a first connecting block 25 and a second connecting block 26 are further included, and the first end 11 and the second end 12 of adjacent batteries 10 are directly plugged together. Structure one is constructed as the first connecting block 25, and structure two is constructed as the second connecting block 26. The first connecting block 25 is integrated with the first end 11, and the second connecting block 26 is integrated with the second end 12. A second plug-in portion 202 is provided on the first connecting block 25, and a first plug-in portion 201 is provided on the second connecting block 26. The first plug-in portion 201 is plug-fitted with the first pole 111, and the second plug-in portion 202 is plug-fitted with the second pole 121.

[0055] Furthermore, the first pole 111 protrudes from the first end plate and is plugged and matched with the connector 20 provided on the second end plate, or the second pole 121 protrudes from the second end plate and is plugged and matched with the connector 20 provided on the first end plate, or the first pole 111 protrudes from the first connection block 25 and is plugged and matched with the second connection block 26, and the second pole 121 protrudes from the second connection block 26 and is plugged and matched with the first connection block 25, so that there is no need to separately set up the connector 20, the structure is simpler, the space occupancy is smaller, and the same technical effects as the first embodiment and the second embodiment can be achieved. .

[0056] like Fig. 9 As shown, further, the battery assembly 100 also includes: a first insulating layer 24, the first insulating layer 24 is coated on the connection area between the first end 11 and the second end 12 to achieve electrical isolation and protection, thereby improving the stability and safety of the battery assembly 100.

[0057] It is understandable that a first avoidance hole may be provided on the first insulating layer 24, a collection boss 23 may be formed on the connector 20, and the collection boss 23 may extend out of the first avoidance hole to facilitate the collection of electrical signals.

[0058] Fourth embodiment:

[0059] like Fig.10 As shown, it should be pointed out that the difference between the fourth embodiment and the third embodiment is that a second mounting hole 251 and a third mounting hole are further provided, and the threaded fastening of the connector 20 and the first pole 111, and the connector 20 and the second pole 121 are respectively realized through the second mounting hole 251 and the third mounting hole, which can improve the structural stability and reliability of the battery assembly 100.

[0060] In other words, the first connecting block 25 is provided with a second mounting hole 251 corresponding to the second plug-in portion 202, and the second connecting block 26 is provided with a third mounting hole corresponding to the first plug-in portion 201, and is suitable for fixing the first pole 111 and the second pole 121 respectively by fasteners matching the second mounting hole 251 or the third mounting hole, thereby improving the structural stability and reliability of the battery assembly 100.

[0061] According to some embodiments of the present invention, the first pole 111 and the second pole 121 are opposite to each other in the width direction and / or the height direction.

[0062] That is to say, the first pole 111 is relatively arranged at least in the width direction, or in the length direction, or in both the width direction and the length direction, so that the electrical connection area between the first pole 111 and the connector 20, and the second pole 121 and the connector 20 is larger, and the electrical connection stability and reliability are higher, avoiding local short circuits that cause overheating inside the battery assembly 100, thereby improving the working stability and reliability of the battery assembly 100.

[0063] The energy storage device according to the embodiment of the second aspect of the utility model includes: at least one group of battery assemblies 100 in the above embodiment.

[0064] According to the energy storage device of the embodiment of the utility model, the above-mentioned battery assembly 100 is used to improve the energy density of the energy storage device, make the energy efficiency of the energy storage device higher, and improve the reliability, stability and safety of the energy storage device.

[0065] It should be pointed out that the energy storage device in the embodiment of the utility model can be used as a power supply energy device for electrical equipment such as vehicles, and can also be formed into an energy storage device with other uses.

[0066] It is understandable that since the energy people need is highly temporal and spatial, in order to rationally use energy and improve energy utilization, it is necessary to use a medium or device to store one form of energy in the same form or convert it into another form of energy, and then release it in a specific form of energy based on future application needs. As we all know, to achieve the goal of carbon neutrality, green energy is currently mainly used to replace fossil energy to achieve the purpose of generating green electricity.

[0067] The current green energy mainly includes solar energy, wind energy, hydropower, etc. However, solar energy and wind energy generally have problems of strong intermittency and large volatility, which will cause unstable voltage of the green power grid (not enough electricity during peak hours and too much electricity during low hours). Unstable voltage will cause damage to electricity. Therefore, it may cause the problem of "wind and solar power abandonment" due to insufficient electricity demand or insufficient grid acceptance capacity.

[0068] To solve the problem of insufficient electricity demand or insufficient grid acceptance capacity, we must rely on energy storage devices. That is, the energy storage device converts electrical energy into other forms of energy through physical or chemical means and stores it, and then converts the energy stored in the energy storage device into electrical energy when needed. In simple terms, the energy storage device is similar to a large "power bank", which stores electrical energy when there is sufficient light energy and wind energy, and releases the stored electrical energy when needed.

[0069] At present, energy storage (i.e. energy storage) has a wide range of application scenarios, including power generation side energy storage, grid side energy storage, renewable energy grid-connected energy storage and user side energy storage. The corresponding types of energy storage devices include:

[0070] (1) Large energy storage containers used in grid-side energy storage scenarios can serve as high-quality active and reactive power regulation power sources in the grid, achieve load matching of electric energy in time and space, enhance the ability to absorb renewable energy, and are of great significance in grid system backup, relieving peak load power supply pressure, and peak and frequency regulation;

[0071] (2) The main operating mode of small and medium-sized energy storage cabinets used in industrial and commercial energy storage scenarios (banks, shopping malls, etc.) on the user side and small household energy storage boxes used in home energy storage scenarios on the user side is "peak shaving and valley filling". Since there is a large price difference in electricity charges at peak and valley locations according to electricity demand, after users have energy storage equipment, in order to reduce costs, they usually charge the energy storage cabinets / boxes during the low electricity price period; during the peak electricity price period, the electricity in the energy storage equipment is discharged for use to achieve the purpose of saving electricity bills. In addition, in remote areas and areas prone to natural disasters such as earthquakes and hurricanes, the existence of household energy storage devices is equivalent to users providing themselves and the power grid with backup power, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0072] In combination with the above-mentioned situation of storing energy by physical or electrochemical means, taking electrochemical energy storage as an example, the energy storage device may include at least one group of chemical batteries, using the chemical elements in the chemical batteries as energy storage media, so as to realize the charging and discharging process through the chemical reaction or change of the energy storage medium. In simple terms, the electric energy generated by light energy and wind energy is stored in at least one group of chemical batteries through the chemical reaction or change of the energy storage medium, and when the use of external electric energy reaches a peak, the electric energy stored in at least one group of chemical batteries is released for use through the chemical reaction or change of the energy storage medium, or transferred to places where electric energy is scarce for use.

[0073] Other structures and operations of the battery assembly 100 and the energy storage device according to the embodiment of the utility model are known to ordinary technicians in the field and will not be described here in detail.

[0074] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0075] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.

[0076] In the description of the present invention, "plurality" means two or more.

[0077] In the description of the present invention, a first feature being “above” or “below” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact but are in contact with each other via another feature therebetween.

[0078] In the description of the present invention, a first feature “above”, “over” and “above” a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0079] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0080] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery assembly, characterized in that: include: A plurality of batteries (10), wherein the plurality of batteries (10) are electrically connected along a length direction, and a first end (11) of a preceding battery (10) is opposite to a second end (12) of a succeeding battery (10), a first pole (111) being disposed on the first end (11), and a second pole (121) being disposed on the second end (12); wherein The first end (11) and the second end (12) of adjacent batteries (10) are directly or indirectly plugged into each other to achieve structural and electrical connection of adjacent batteries (10).

2. The battery assembly according to claim 1, characterized in that: Also includes: A connector (20) is used for indirectly plugging and matching the first end (11) and the second end (12) of adjacent batteries (10). The connector (20) comprises: a body (21) and an insulating portion (22) sleeved outside the body (21). The body (21) is provided with a first plug-in portion (201) and a second plug-in portion (202). The first plug-in portion (201) is plug-in and matched with the first pole (111), and the second plug-in portion (202) is plug-in and matched with the second pole (121).

3. The battery assembly according to claim 2, characterized in that: The main body (21) is provided with a collecting boss (23), and the collecting boss (23) extends out of the insulating portion (22) and is exposed.

4. The battery assembly according to claim 2, characterized in that: The body (21) is provided with a first mounting hole (211), the first mounting hole (211) being provided corresponding to the first plug-in portion (201) and the second plug-in portion (202), and being suitable for fixing the first pole (111) and the second pole (121) by means of a fastener matching the first mounting hole (211).

5. The battery assembly according to claim 1, characterized in that: Also includes: A first connecting block (25) and a second connecting block (26), the first end (11) and the second end (12) of adjacent batteries (10) are directly plugged together, the first connecting block (25) is integrated with the first end (11), the second connecting block (26) is integrated with the second end (12), the first connecting block (25) is provided with a second plug-in portion (202), the second connecting block (26) is provided with a first plug-in portion (201), the first plug-in portion (201) is plug-in-matched with the first pole (111), and the second plug-in portion (202) is plug-in-matched with the second pole (121).

6. The battery assembly according to claim 5, characterized in that: Also includes: A first insulating layer (24), the first insulating layer (24) covers a connection area between the first end (11) and the second end (12).

7. The battery assembly according to claim 6, characterized in that: A first avoidance hole is provided on the first insulating layer (24), a collecting boss (23) is formed on the connecting member (20), and the collecting boss (23) protrudes out of the first avoidance hole.

8. The battery assembly according to claim 5, characterized in that: The first connection block (25) is provided with a second mounting hole (251) corresponding to the second plug-in portion (202), and the second connection block (26) is provided with a third mounting hole corresponding to the first plug-in portion (201), and is suitable for fixing the first pole (111) and the second pole (121) respectively by means of a fastener that cooperates with the second mounting hole (251) or the third mounting hole.

9. The battery assembly according to any one of claims 1 to 8, characterized in that: The first pole (111) and the second pole (121) are opposite to each other in a width direction and / or a height direction.

10. An energy storage device, characterized in that: include: At least one battery assembly according to any one of claims 1 to 9.

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