CN220066044U - Battery monomer, battery and power consumption device - Google Patents

Abstract

The utility model relates to a battery cell and a battery, wherein positive pole posts and negative pole posts are distributed on the same side of the central line of the surface of a top cover sheet, so that a space on the other side of the surface of the top cover sheet can be reserved, and a blank area with larger area is formed on the surface of the top cover sheet. The blank area can provide a larger supporting area, so that when the battery cells are assembled into a battery, a cooling bottom plate is arranged at the bottoms of the plurality of battery cells, and a cooling top plate can be additionally arranged in the blank area of the top cover sheet. The cooling top plate is fully contacted with the top cover sheet, so that heat generated in the core heating area can be taken away. Therefore, the heat dissipation efficiency of the battery cell and the battery can be remarkably improved. The utility model also relates to an electrical device.

Description

Battery monomer, battery and power consumption device

Technical Field

The utility model relates to the technical field of new energy, in particular to a battery monomer, a battery and an electric device.

Background

With the continuous development of new energy technology, the demand for energy is also increasing, and the development of batteries is also tending to have large capacity and large size. In particular, in the energy storage field, higher requirements are put on the high-current charge and discharge performance. Under the condition of high-current charge and discharge, the heat productivity of the battery is huge, so a cooling system is generally required to be arranged to rapidly take away the heat.

The cooling components, such as the liquid cooling plates, in the existing cooling systems can only be arranged at the bottom of the battery cells, which is limited by the structure of the battery cells. However, the main heat-generating region of the battery cell is concentrated near the top pole. Therefore, heat generated in the core heating area of the battery cell cannot be quickly taken away through the cooling assembly at the bottom, so that the heat dissipation efficiency of the battery is low.

Disclosure of Invention

In view of the above, it is necessary to provide a battery cell and a battery capable of improving heat dissipation efficiency.

The utility model provides a battery monomer, includes casing, electric core subassembly and top cap piece, casing one side opening, electric core subassembly accept in the casing, the top cap piece sealed set up in the opening of casing, be provided with anodal post and negative pole post on the top cap piece, anodal post with the negative pole post respectively with the anodal ear and the negative pole ear electricity of electric core subassembly are connected, anodal post with the negative pole post distribute in the same side of the central line on top cap piece surface, so that the surface of top cap piece forms blank area.

In one embodiment, the top cover plate is further provided with an explosion-proof valve and a liquid injection hole, and the explosion-proof valve and the liquid injection hole, the positive pole and the negative pole are distributed on the same side of the central line.

In one embodiment, the top cover sheet is rectangular, the center line is a long-side center line, and the positive electrode posts and the negative electrode posts are arranged at intervals along the width direction of the top cover sheet.

In one embodiment, the battery cell assembly further comprises an adapter, wherein the adapter comprises a positive electrode adapter piece, a negative electrode adapter piece and an insulation structure, the positive electrode adapter piece is fixedly connected with the negative electrode adapter piece and is insulated through the insulation structure, two ends of the positive electrode adapter piece are respectively welded with the positive electrode post and the positive electrode lug of the battery cell assembly, and two ends of the negative electrode adapter piece are respectively welded with the negative electrode post and the negative electrode lug of the battery cell assembly.

In one embodiment, the insulation structure is an insulation sheet, and the positive electrode switching sheet and the negative electrode switching sheet are respectively disposed on two sides of the insulation sheet to realize fixed connection.

In one embodiment, the positive electrode transfer sheet includes a first tab welding area and a first tab welding area opposite to the first tab welding area along a first direction, the negative electrode transfer sheet includes a second tab welding area and a second tab welding area opposite to the second tab welding area along the first direction, the first tab welding area and the second tab welding area are arranged at intervals along the first direction, and the first tab welding area and the second tab welding area are arranged at intervals along a second direction perpendicular to the first direction.

A battery, comprising:

a plurality of the battery cells according to any one of the above preferred embodiments, the plurality of battery cells being arranged in parallel; and

And the cooling assembly comprises a cooling top plate, and the cooling top plate extends along the arrangement direction of a plurality of battery cells and is supported in the blank area.

In one embodiment, the cooling assembly further comprises a plurality of cooling side plates perpendicular to the cooling top plate, and the cooling side plates are sandwiched between two adjacent battery cells.

In one embodiment, a cooling flow passage through which a cooling medium flows is formed in the cooling top plate and/or the cooling side plate.

The battery cell and the battery have the advantages that the positive electrode posts and the negative electrode posts are distributed on the same side of the center line of the surface of the top cover sheet, so that the space on the other side of the surface of the top cover sheet can be reserved, and a blank area with larger area is formed on the surface of the top cover sheet. The blank area can provide a larger supporting area, so that when the battery cells are assembled into a battery, a cooling bottom plate is arranged at the bottoms of the plurality of battery cells, and a cooling top plate can be additionally arranged in the blank area of the top cover sheet. The cooling top plate is fully contacted with the top cover sheet, so that heat generated in the core heating area can be taken away. Therefore, the heat dissipation efficiency of the battery cell and the battery can be remarkably improved.

In addition, the utility model also provides an electric device.

An electrical device comprising a battery cell as described in any of the above preferred embodiments or a battery as described in any of the above preferred embodiments.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view showing a partial structure of a battery according to a preferred embodiment of the present utility model;

FIG. 2 is a schematic view of the battery of FIG. 1 with the cooling assembly omitted and the bus bar assembly installed;

FIG. 3 is a schematic view of the structure of a battery cell in the battery shown in FIG. 1;

fig. 4 is a schematic view of the battery cell shown in fig. 3 with the housing omitted;

FIG. 5 is a schematic view of the adaptor in the battery cell shown in FIG. 3;

FIG. 6 is an exploded view of the adapter of FIG. 5;

FIG. 7 is a top view of the cooling assembly of the battery of FIG. 1;

fig. 8 is a front view of the cooling assembly of fig. 7.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

The utility model discloses an electric device, a battery and a battery cell. The electric device can be a vehicle, a mobile phone, portable equipment, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool, energy storage equipment, recreation equipment, an elevator, lifting equipment and the like. The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle; spacecraft including airplanes, rockets, space planes, spacecraft, and the like; the electric toy includes fixed or mobile electric toys, such as a game machine, an electric car toy, an electric ship toy, or an electric plane toy, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, electric planers, and the like; the energy storage device can be an energy storage wall, a base station energy storage, a container energy storage and the like; the amusement device may be a carousel, a stair jump machine, or the like. The present utility model does not particularly limit the above-described power consumption device.

For new energy automobiles, the battery can be used as a driving power source to replace fossil fuel to provide driving power.

Referring to fig. 1 and 2, a battery 10 according to a preferred embodiment of the present utility model includes a battery cell 100 and a cooling assembly 200.

The battery cells 100 include a plurality of battery cells 100, and the plurality of battery cells 100 may be arranged in a matrix. The battery 10 may be a battery pack or a battery module. When the battery 10 is a battery pack, the plurality of battery cells 100 may be electrically connected in series, parallel, or a combination of series and parallel, and may be communicatively connected to a battery management system that controls and monitors the operating states of the battery cells 100 to form the battery pack. In addition, the plurality of battery cells 100 may be connected in series and/or in parallel, and form a battery module with the module management system, and then the plurality of battery modules are electrically connected in series, in parallel or in a mixed manner of series and parallel, and form a battery pack together with the battery management system.

The cooling assembly 200 is used for controlling the temperature of the plurality of battery cells 100 in the battery 10 to prevent the temperature of the battery cells 100 from being excessively high.

The plurality of battery cells 100 in the battery 10 may be mounted on a supporting structure such as a case, a frame, a bracket, etc., and the battery cells 100 may be electrically connected to each other and the battery cell 100 and the battery management system by the bus member 300. The battery cell 100 may be a lithium ion battery, a sodium ion battery or a magnesium ion battery, and the outer contour thereof may be a cylinder, a flat body, a rectangular parallelepiped or other shapes, but is not limited thereto. In order to improve the space utilization, the battery cell 100 in the present embodiment is a prismatic battery.

Referring to fig. 3 and 4 together, the battery cell 100 according to the preferred embodiment of the utility model includes a housing 110, a cell assembly 120, a top cover sheet 130, a positive electrode post 140 and a negative electrode post 150.

The case 110 has a hollow structure, and has a receiving space therein for receiving the battery cell assembly 120, the electrolyte, and other components. An opening (not shown) is formed at one end of the housing 110, through which the cell assembly 120 can be fitted into the housing 110. Since the case 110 in the present embodiment is applied to a square battery, the external contour of the case 110 is rectangular, and the opening is substantially rectangular.

The battery cell assembly 120 is a core component of the battery cell 100, and is housed in the case 110. To adapt to the shape of the housing 110, the battery cell assembly 120 in this embodiment has a rectangular parallelepiped shape. Each housing 110 can simultaneously accommodate a plurality of, e.g., two, cell assemblies 120, and the plurality of cell assemblies 120 are disposed in parallel. The battery cell assembly 120 includes a positive tab 121 and a negative tab 122, and the positive tab 121 and the negative tab 122 are located at the same end of the battery cell assembly 120. The cell assembly 120 may be formed by winding or laminating a positive electrode sheet, a negative electrode sheet and a separator having an insulating function between the negative electrode sheet and the positive electrode sheet, and the wound and formed cell assembly 120 may be pressed into a flat shape.

The cover sheet 130 seals the opening provided in the case 110 to form a relatively closed environment inside the case 110, thereby isolating the cell assembly 120 from the external environment. The top sheet 130 may be formed of a material having high mechanical strength, such as aluminum, aluminum alloy, or stainless steel. The shape of the top sheet 130 is adapted to the shape of the opening of the housing 110, in particular in this embodiment the top sheet 130 is substantially rectangular.

The positive electrode post 140 and the negative electrode post 150 are disposed on the top cover 130 and electrically connected to the positive electrode tab 121 and the negative electrode tab 122 of the battery cell assembly 120, respectively. The positive electrode tab 140 and the negative electrode tab 150 are insulated from the top cover sheet 130, thereby preventing the two from shorting. Further, the positive electrode posts 140 and the negative electrode posts 150 are distributed on the same side of the center line of the surface of the top cover sheet 130, so that the surface of the top cover sheet 130 forms a blank area 101. Since the top sheet 130 is rectangular, the center line refers to the long side center line, i.e., the line passing through the midpoints of the two long sides of the top sheet 130.

That is, the positive electrode tab 140 and the negative electrode tab 150 are biased to one side (right side in fig. 3) on the surface of the top cover sheet 130. Thus, a space on the other side (left side in fig. 3) of the surface of the top sheet 130 is left and a blank area 101 is formed. The positive electrode column 140 and the negative electrode column 150 are not provided in the blank region 101, and the area is large. Therefore, the top cap sheet 130 can provide a larger supporting area, thereby facilitating the cooling assembly 200 to be disposed on the top of the battery cell 100 to improve the heat dissipation efficiency of the battery cell 100.

Specifically, referring to fig. 1 again, the cooling assembly 200 includes a cooling top plate 210, and the cooling top plate 210 extends along the arrangement direction of the plurality of battery cells 100 and is carried in the empty region 101. In the case where a plurality of battery cells 100 are arranged in a plurality of rows, a plurality of cooling top plates 210 may be provided correspondingly. The cooling top plate 210 can be in sufficient contact with the top cover sheet 130, and the core heat generating region of the battery cell 100 is located near the top cover sheet 130. Therefore, the cooling assembly 200 can rapidly remove heat generated from the core heat generating region of the battery cell 100.

In order to further improve the heat dissipation efficiency of the battery cell 100, the surface of the blank area 101 may be further provided with heat dissipation teeth, heat dissipation grooves, and other structures to increase the heat dissipation area of the blank area 101. In addition, the cooling assembly 200 may further include a bottom plate (not shown) provided at the bottom of the plurality of battery cells 100. The cooling bottom plate is coupled with the cooling top plate 210, and can exchange heat with the battery cell 100 from the upper and lower ends, thereby improving the heat dissipation efficiency of the battery 10.

Referring to fig. 7 and 8, in the present embodiment, the cooling assembly 200 further includes a plurality of cooling side plates 220 perpendicular to the cooling top plate 210, and the cooling side plates 220 are sandwiched between two adjacent battery cells 100. The cooling side plate 220 contacts the side surface of the battery cell 100, and can remove heat generated from the battery cell 100 from the side surface. As can be seen from this, the cooling assembly 200 can form a three-dimensional cooling effect for each battery cell 100, thereby further improving the heat dissipation efficiency of the battery 10.

Specifically, the cooling top plate 210 and the plurality of cooling side plates 220 form a comb-like structure. The width (the dimension in the up-down direction of fig. 7) of the cooling side plate 220 is generally greater than the width of the cooling top plate 210, so the cooling side plate 220 can extend to the entire side of the battery cell 100.

Further, in the present embodiment, a cooling flow passage (not shown) through which a cooling medium flows is formed in the cooling top plate 210 and/or the cooling side plate 220. When cooling flow passages are formed in both the cooling top plate 210 and the cooling side plate 220, the cooling flow passages in both can be communicated. When the cooling medium flows along the cooling flow channel, heat exchange can be performed with the cooling top plate 210 and the cooling side plate 220, and heat can be rapidly taken away, so that the heat exchange efficiency between the cooling top plate 210 and the cooling side plate 220 and the battery cell 100 is improved.

It should be noted that in other embodiments, the cooling top plate 210 and the cooling side plate 220 may be fin structures, and dissipate heat through a larger surface area.

Referring again to fig. 2, since the positive electrode tab 140 and the negative electrode tab 150 are biased to one side on the surface of the top cover sheet 130, the battery cell 100 has a natural foolproof property when the battery 10 is assembled. If the direction of one of the battery cells 100 is reversed, the positive electrode 140 and the negative electrode 150 of that battery cell 100 are disposed in the opposite direction to the positive electrode 140 and the negative electrode 150 of the other battery cell 100, so that the battery cell can be visually recognized.

When the plurality of battery cells 100 are arranged in parallel, the positive electrode posts 140 and the negative electrode posts 150 are alternately arranged, so that the current collecting member 300 can connect the positive electrode posts 140 and the negative electrode posts 150 of the front and rear battery cells 100 in sequence. Thus, when the plurality of battery cells 100 are electrically connected in series, the battery cell has excellent error recognition capability, can effectively avoid erroneous series connection, and has an extremely simple series structure.

Referring to fig. 3 and 4 again, in the present embodiment, the top cover sheet 130 is further provided with an explosion-proof valve 131 and a liquid injection hole 132, and the explosion-proof valve 131 and the liquid injection hole 132 are distributed on the same side of the center line as the positive electrode column 140 and the negative electrode column 150.

When the gas pressure in the housing 110 exceeds the threshold value, the explosion-proof valve 131 can be opened to release the pressure in the housing 110, thereby preventing the explosion of the battery cell 100. After the top cover sheet 130 seals the opening of the case 110, the electrolyte may be injected into the inside of the case 110 through the injection hole 132. After the injection is completed, the injection hole 132 will be plugged by laser welding.

In addition, since the explosion-proof valve 131 and the filling hole 132 are located on the same side as the positive electrode column 140 and the negative electrode column 150, the explosion-proof valve 131 and the filling hole 132 do not occupy the space 101.

In the present embodiment, the positive electrode posts 140 and the negative electrode posts 150 are disposed at intervals along the width direction of the top cover sheet 130. Thus, when the plurality of battery cells 100 are arranged in parallel, the positive electrode posts 140 and the negative electrode posts 150 are arranged in a linear manner, so that the current collecting member 300 is more conveniently connected with the positive electrode posts 140 and the negative electrode posts 150. The distance between the positive electrode tab 140 and the negative electrode tab 150 increases, and the welding with the positive electrode tab 121 and the negative electrode tab 122 can be facilitated.

Referring to fig. 5 and fig. 6 together, in the present embodiment, the battery cell 100 further includes an adapter 160, the adapter 160 includes a positive electrode adapter 161, a negative electrode adapter 162, and an insulation structure 163, and the positive electrode adapter 161 and the negative electrode adapter 162 are fixedly connected and insulated by the insulation structure 163. Both ends of the positive electrode tab 161 are welded to the positive electrode post 140 and the positive electrode tab 121 of the cell assembly 120, and both ends of the negative electrode tab 162 are welded to the negative electrode post 150 and the negative electrode tab of the cell assembly 120.

The insulating structure 163 may be an insulating sheet molded of an insulating material such as rubber, or may be an insulating coating layer, and can insulate the positive electrode tab 161 from the negative electrode tab 162. The adaptor 160 is an integrated structure, and can replace the conventional separately arranged positive electrode adaptor and negative electrode adaptor, so that the number of components can be reduced, the stations required during assembly can be simplified, and the manufacturing cost and the processing efficiency can be effectively reduced.

Specifically, in the present embodiment, the insulating structure 163 is an insulating sheet, and the positive electrode switching sheet 161 and the negative electrode switching sheet 162 are respectively disposed on two sides of the insulating sheet to achieve a fixed connection. It can be seen that the insulating structure 163 can serve as both an insulator and support the positive and negative electrode tabs 161 and 162, thereby making the structure of the adapter 160 simpler.

In the present embodiment, a clearance groove 1601 is formed between the positive electrode tab 161 and the negative electrode tab 162, the clearance hole 1631 being formed in the insulating structure 163, the clearance hole being formed in opposition to the explosion-proof valve 131. The relief groove 1601 prevents the adapter 160 from blocking the explosion valve 131, and the relief hole 1631 prevents the adapter 160 from blocking the priming hole 132.

Further, in the present embodiment, the positive electrode tab 161 includes a first tab bonding area 1611 and a first tab bonding area 1612 disposed opposite to the first tab bonding area 1611 along the first direction, and the negative electrode tab 162 includes a second tab bonding area 1621 and a second tab bonding area 1622 disposed opposite to the second tab bonding area 1621 along the first direction. The first tab bonding area 1611 and the second tab bonding area 1621 are disposed at intervals along a first direction, and the first tab bonding area 1612 and the second tab bonding area 1622 are disposed at intervals along a second direction perpendicular to the first direction.

Specifically, the first direction refers to the longitudinal direction of the top cover sheet 130, and the second direction refers to the width direction of the top cover sheet 130. The positive tab 121 and the negative tab 122 are generally disposed at intervals along the first direction, i.e., the longitudinal direction of the top cover 130, so the first tab welding area 1611 and the second tab welding area 1621 are provided to facilitate the connection of the positive tab 121 and the negative tab 122 to the positive tab 161 and the negative tab 162, respectively. The first electrode bonding area 1612 is aligned with the second electrode bonding area 1622 along the first direction and is spaced apart along the second direction, so that the positive and negative electrodes of the cell assembly 120 can be connected to the positive and negative electrodes 140 and 150 on the same side of the top cover 130.

The insulating structure 163 may take the form of a full cladding, i.e., the other areas of the positive and negative electrode tabs 161, 162 are all wrapped by the insulating structure 163 except for the first tab land 1611, the first post land 1612, the second tab land 1621, and the second post land 1622. In addition, the insulating structure 163 may be partially coated, and the insulating structure 163 may cover only a small portion of the positive electrode tab 161 and the negative electrode tab 162, so long as insulation between the two is ensured.

In the battery cell 100 and the battery 10, the positive electrode posts 140 and the negative electrode posts 150 are disposed on the same side of the center line of the surface of the top sheet 130, so that a space on the other side of the surface of the top sheet 130 is left, and a large-area blank region 101 is formed on the surface of the top sheet 130. The empty region 101 can provide a large supporting area, so that when the battery cells 100 are assembled into the battery 10, the cooling bottom plate is provided at the bottom of the plurality of battery cells 100, and the cooling top plate 210 can be additionally installed in the empty region 101 of the top cover sheet 130. The cooling top plate 210 is in sufficient contact with the top cover sheet 130, and can remove heat generated in the core heat generating region. Therefore, the heat dissipation efficiency of the battery cell 100 and the battery 10 can be significantly improved.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (10)

1. The utility model provides a battery monomer, includes casing, electric core subassembly and top cap piece, casing one side opening, electric core subassembly accept in the casing, the top cap piece sealed set up in the opening of casing, be provided with anodal post and negative pole post on the top cap piece, anodal post with the negative pole post respectively with the anodal ear and the negative pole ear electricity of electric core subassembly are connected, its characterized in that, anodal post with the negative pole post distribute in the same side of the central line on top cap piece surface, so that the surface of top cap piece forms blank area.

2. The battery cell of claim 1, wherein the top cover sheet is further provided with an explosion-proof valve and a liquid injection hole, and the explosion-proof valve and the liquid injection hole are distributed on the same side of the center line as the positive electrode column and the negative electrode column.

3. The battery cell according to claim 1, wherein the top cover sheet is rectangular, the center line is a long-side center line, and the positive electrode posts and the negative electrode posts are arranged at intervals in the width direction of the top cover sheet.

4. The battery cell of claim 1, further comprising an adapter, wherein the adapter comprises a positive electrode adapter piece, a negative electrode adapter piece and an insulation structure, the positive electrode adapter piece is fixedly connected with the negative electrode adapter piece and is insulated through the insulation structure, two ends of the positive electrode adapter piece are respectively welded with the positive electrode post and the positive electrode lug of the cell assembly, and two ends of the negative electrode adapter piece are respectively welded with the negative electrode post and the negative electrode lug of the cell assembly.

5. The battery cell according to claim 4, wherein the insulating structure is an insulating sheet, and the positive electrode switching sheet and the negative electrode switching sheet are respectively disposed on both sides of the insulating sheet to achieve fixed connection.

6. The battery cell of claim 4, wherein the positive tab comprises a first tab land and a first post land disposed opposite the first tab land in a first direction, the negative tab comprises a second tab land and a second post land disposed opposite the second tab land in the first direction, the first tab land and the second tab land are disposed in the first direction at a spacing, and the first post land and the second post land are disposed in a second direction perpendicular to the first direction at a spacing.

7. A battery, comprising:

a plurality of battery cells according to any one of claims 1 to 6, the plurality of battery cells being arranged in parallel; and

And the cooling assembly comprises a cooling top plate, and the cooling top plate extends along the arrangement direction of a plurality of battery cells and is supported in the blank area.

8. The battery of claim 7, wherein said cooling assembly further comprises a plurality of cooling side plates perpendicular to said cooling top plate, said cooling side plates being sandwiched between adjacent ones of said battery cells.

9. The battery according to claim 8, wherein a cooling flow passage through which a cooling medium flows is formed in the cooling top plate and/or the cooling side plate.

10. An electrical device comprising a battery cell according to any one of the preceding claims 1 to 6 or a battery according to any one of the preceding claims 7 to 9.