Battery assembly and battery

Abstract

The utility model provides a kind of battery assembly and battery, battery assembly includes a pair of adapter sheet, bandage and multiple electric core, multiple electric core is stacked to form electric core group, positive pole lug and negative pole lug respectively have bending structure, bending structure is stacked in the top surface of adapter sheet, bandage has the connecting section extending along the electric core stacking direction and the fixed section being set to the both ends of connecting section, connecting section is set to the top surface of electric core group and covers bending structure, fixed section is set to the two big surfaces of electric core group two sides along the direction of multiple electric core stacking, connecting section has and communicates with the liquid injection hole opposite and the liquid passing hole on it.The bandage of the application is set to the top surface and two big surfaces of electric core group, and then fixed and bound electric core group by bandage, to ensure the stability of the structure of electric core group, and then the problem that the battery in the prior art exists inconveniently overcome due to diaphragm fluffy leads to the performance of battery and the safety of use is affected can be solved.

Description

Technical Field

[0001] This utility model relates to the field of battery-related technology, specifically to a battery assembly and a battery. Background Technology

[0002] In battery manufacturing, cell assembly is a crucial step that directly impacts battery performance and safety. Traditionally, after cell assembly, the tabs are typically fixed by welding. However, during subsequent vertical standing, the separator may become porous due to gravity and electrolyte wetting. Separator porosity refers to the separator gradually expanding outwards without sufficient support, especially at the top of the cell, due to its own elasticity or the expanding force of the electrolyte. This results in uneven contact between the positive and negative electrodes and the separator. This uneven contact not only increases the battery's internal resistance and reduces the utilization rate of electrochemical active materials, but may also disrupt the lithium-ion transport path within the cell, affecting overall battery performance and safety.

[0003] Currently, to address the aforementioned technical issues caused by membrane porosity, the industry is continuously attempting to improve cell assembly methods and materials. However, existing solutions often have limitations. For instance, while using membranes made of special materials can improve their mechanical strength and reduce porosity, these materials are often expensive, have complex manufacturing processes, and may affect other battery performance indicators, such as lithium-ion permeability and battery self-discharge rate.

[0004] As can be seen from the above, existing batteries have the problem of affecting battery performance and safety due to the looseness of the separator. Utility Model Content

[0005] The main objective of this invention is to provide a battery assembly and a battery to solve the problem that existing batteries are difficult to overcome due to the looseness of the separator, which affects battery performance and safety.

[0006] To achieve the above objectives, according to one aspect of the present invention, a battery assembly is provided. The battery assembly includes a pair of adapter plates, a strap, and multiple battery cells stacked to form a battery cell group. The adapter plates are respectively disposed on the positive electrode tab side and the negative electrode tab side of the battery cell group. The positive electrode tab and the negative electrode tab each have a bending structure. The bending structure is stacked on the top surface of the adapter plate. The strap has a connecting section extending along the battery cell stacking direction and a fixing section disposed at both ends of the connecting section. The connecting section is disposed on the top surface of the battery cell group and covers the top surface of the bending structure. The fixing section is disposed on two large surfaces on both sides of the battery cell group along the direction of multiple battery cell stacking. The connecting section has a liquid passage hole.

[0007] Furthermore, along the length of the battery cell, the connecting section successively covers the bending structure of the positive electrode tab and the bending structure of the negative electrode tab, and the connecting section also has an air passage hole.

[0008] Furthermore, the strap has two parts spaced apart along the length of the battery cell, one part having a connecting section covering the bent structure of the positive electrode tab, and the other part having a connecting section covering the bent structure of the negative electrode tab, and at least one of the two parts has a liquid passage hole.

[0009] Furthermore, along the length of the battery cell, the extension length of the connecting section of the two parts is the same; and / or along the height of the battery cell, the extension length of the fixing section of the two parts is the same.

[0010] Furthermore, the connecting section forms a projection of a first region on the top surface of the cell, and the bending structures of the positive electrode tab and the negative electrode tab form projections of a second region on the top surface of the cell, with the second region located inside the first region.

[0011] Furthermore, there may be one liquid passage hole; or there may be multiple liquid passage holes forming a mesh-like liquid passage area.

[0012] Furthermore, along the height direction of the battery cell, the extension length H of the fixed section satisfies 10mm≤H≤40mm.

[0013] Furthermore, the binding strap is made of adhesive tape; and / or the connecting section and the fixing section are perpendicular, and the binding strap is formed into an inverted U-shaped structure; and / or along the length of the battery cell, the adapter plate posts of the two adapter plates are disposed on both sides of the binding strap.

[0014] Furthermore, along the direction of stacking multiple cells, the positive or negative tabs of the two middle cells have bending structures arranged in opposite directions, forming a clearance area between the two bending structures, and the liquid passage hole is located inside the clearance area, with its projection along the height direction of the cell.

[0015] According to another aspect of the present invention, a battery is provided, the battery including the above-described battery assembly and battery top cover, the battery top cover being disposed on top of the strap and adapter piece, the battery top cover having an injection hole, the injection hole being opposite to and communicating with the liquid passage hole.

[0016] According to the technical solution of this utility model, the battery assembly includes a pair of adapter pieces, a strap, and multiple battery cells. The multiple battery cells are stacked to form a battery cell group. The adapter pieces are respectively disposed on the positive electrode tab side and the negative electrode tab side of the battery cell group. The positive electrode tab and the negative electrode tab each have a bending structure. The bending structure is stacked on the top surface of the adapter piece. The strap has a connecting section extending along the battery cell stacking direction and a fixing section disposed at both ends of the connecting section. The connecting section is disposed on the top surface of the battery cell group and covers the top surface of the bending structure. The fixing section is disposed on two large surfaces on both sides of the battery cell group along the direction of multiple battery cell stacking. The connecting section has a liquid passage hole.

[0017] As can be seen from the above, the battery assembly of this application uses straps to set the top surface and two large surfaces of the cell group, thereby fixing and binding the cell group to ensure the structural stability of the cell group. The structure of the straps overcomes the expansion force of the loose separator. The structure of the straps and cell group used in this application avoids the problem of the separator becoming loose. The structural design of the battery assembly of this application improves the structural stability of the cell group, while ensuring the performance of the battery and improving the safety of battery use.

[0018] This application provides a liquid passage hole on the connecting section of the strap to ensure that the strap will not interfere with the flow of liquid when liquid needs to be injected through the injection hole. Thus, the strap of this application can not only fix the cell pack and overcome the problem of the separator being loose, but also the structure of the liquid passage hole on the strap can ensure the smooth liquid injection operation of the battery, which is conducive to ensuring the assembly efficiency of the cell pack.

[0019] The connecting section of the strap in this application covers both the positive and negative electrode tabs, which helps improve the safety of the structure and avoids the risk of open circuits caused by exposed positive and negative electrode tabs. At the same time, the strap is set on the top surface of the bent structure, which helps improve the stability of the contact and fit between the bent structure and the adapter piece, and improves the stability of the connection between the positive electrode tab and the adapter piece, and between the negative electrode tab and the adapter piece, thereby improving the stability of the battery's conductive structure. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0021] Figure 1 A schematic diagram of the mating structure of the battery top cover, adapter piece, cell assembly and strap provided in this application;

[0022] Figure 2 A top view of the installation structure of the strap provided in this application;

[0023] Figure 3A schematic diagram of the mounting structure of the strap and battery cell provided in this application;

[0024] Figure 4 A perspective view of the mounting structure of the battery cell assembly, straps, and adapter plates provided in this application;

[0025] Figure 5 A schematic diagram illustrating the fit between the injection hole and the passage hole provided in this application.

[0026] The above figures include the following reference numerals:

[0027] 10. Battery cell; 110. Bending structure; 20. Binding strap; 210. Connecting section; 211. Liquid passage hole; 220. Fixing section; 30. Battery top cover; 310. Liquid filling hole; 40. Explosion-proof valve; 50. Adapter piece; 510. Sheet-shaped part; 520. Adapter piece terminal. Detailed Implementation

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0030] In this utility model, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0031] In order to address the problem that existing batteries are difficult to overcome due to the looseness of the separator, which affects battery performance and safety, this application provides a battery.

[0032] The battery includes a battery assembly and a battery top cover 30. The battery top cover 30 is located on top of the battery assembly and has an injection hole 310 for electrolyte flow.

[0033] Specifically, the battery is a secondary battery, such as a lithium battery or a sodium battery.

[0034] like Figures 1 to 5As shown, the battery assembly includes multiple battery cells 10, adapter pieces 50, and binding straps 20. The multiple battery cells 10 are stacked along the thickness direction of the battery cells 10 to form a battery cell group. The two sides of the battery cell group along the stacking direction of the multiple battery cells 10 are large surfaces. Each battery cell 10 includes a positive electrode sheet, a separator, and a negative electrode sheet. A positive electrode tab is provided on the positive electrode sheet, and a negative electrode tab is provided on the negative electrode sheet.

[0035] Multiple battery cells 10 are provided, with multiple positive and negative electrode tabs provided. Multiple positive electrode tabs are provided on one side along the length of the battery cell 10, and multiple negative electrode tabs are provided on the other side. The multiple positive and negative electrode tabs can be bent by tools to form a bent structure 110 that is approximately parallel to the top surface of the battery cell assembly.

[0036] In this embodiment, two adapter pieces 50 are provided, forming a pair. The two adapter pieces 50 are respectively provided on the positive electrode tab side and the negative electrode tab side of the cell assembly. The adapter piece 50 has a sheet-like portion 510 provided on the top surface of the cell assembly and an adapter piece post 520 provided on the sheet-like portion 510. The positive electrode tab and the negative electrode tab each have a bending structure 110, which is stacked on the top surface of the sheet-like portion 510 of the adapter piece 50. The battery top cover 30 is provided on one side of the top of the cell assembly and is electrically connected to the adapter piece post 520.

[0037] Along the length of the cell 10, the adapter terminals 520 of the two adapter pieces 50 are disposed on both sides of the strap 20 to facilitate welding and conduction between the adapter terminals 520 and the terminal assembly on the battery top cover 30.

[0038] The length direction of cell 10 is as follows Figure 1 As shown in the X direction, the thickness directions of cell 10 and cell assembly are as follows: Figure 1 As shown in the Y direction, the height direction of cell 10 is as follows: Figure 1 The Z direction is shown.

[0039] like Figure 1 and Figure 3 As shown, the strap 20 has a connecting section 210 extending along the stacking direction of the battery cells 10 and a fixing section 220 disposed at both ends of the connecting section 210. The connecting section 210 is disposed on the top surface of the battery cell assembly and covers the top surface of the bending structure 110. The fixing section 220 is disposed on two large surfaces on both sides of the battery cell assembly along the stacking direction of the multiple battery cells 10. The battery top cover 30 is disposed on the top of the strap 20 and the adapter piece 50. The battery top cover 30 has an injection hole 310. The connecting section 210 has a liquid passage hole 211 that is opposite to and communicates with the injection hole 310.

[0040] The strap 20 is adhesive tape, which is used to bond and fix it to the battery cell assembly and the adapter plate 50.

[0041] Furthermore, the connecting section 210 and the fixing section 220 of the strap 20 are an integral structure, the connecting section 210 and the fixing section 220 are perpendicular, and the strap 20 is formed into an inverted U-shaped structure so as to fix the battery cell assembly along the thickness direction of the battery cell 10 through the structure of the connecting section 210 and the fixing section 220.

[0042] In this embodiment, the fixed segment 220 is fixedly connected to two large surfaces in the thickness direction of the battery cell assembly. These two large surfaces of the battery cell assembly are used to increase the connection area, thereby improving the stability of the connection between the fixed segment 220 and the battery cell assembly. (As in this application...) Figure 1 As shown, along the height direction of the battery cell 10, the extension length H of the fixed section 220 satisfies 10mm≤H≤40mm, where H can be 10mm, 20mm, 30mm, 40mm, etc. If the extension length H is too small, it is easy to affect the connection strength between the fixed section 220 and the battery cell assembly. If the extension length H is too large, it will waste costs.

[0043] The battery assembly of this application uses straps 20 to set the top surface and two large surfaces of the cell assembly, thereby fixing and binding the cell assembly to ensure the structural stability of the cell assembly. The structure of the straps 20 overcomes the expansion force of the separator. The structure of the straps 20 and the cell assembly in this application avoids the problem of separator loosening. The structural design of the battery assembly of this application improves the structural stability of the cell assembly, while ensuring battery performance and improving the safety of battery use.

[0044] The direction of the expansion force of the diaphragm is as follows: Figure 2 The direction of NN is shown.

[0045] In this embodiment, the connecting segment 210 has a projection of a first region on the top surface of the cell 10, and the bending structure 110 of the positive electrode tab and the bending structure 110 of the negative electrode tab have projections of a second region on the top surface of the cell 10. The second region is located inside the first region to ensure that the connecting segment 210 completely covers the positive electrode tab and the negative electrode tab.

[0046] Specifically, the connecting section 210 of the strap 20 in this application covers the positive electrode tab and the negative electrode tab, which helps to improve the safety of the structure and avoid the risk of open circuits caused by the exposed positive electrode tab and the negative electrode tab. At the same time, the strap 20 is set on the top surface of the bent structure 110, which helps to improve the stability of the abutment and fit between the bent structure 110 and the adapter piece 50, and helps to improve the stability of the connection between the positive electrode tab and the adapter piece 50, and between the negative electrode tab and the adapter piece 50, thereby improving the stability of the conductive structure of the battery.

[0047] In this embodiment, the strap 20 can be a complete structure, that is, the connecting segment 210 is an integral structure and completely covers the positive electrode tab side, the negative electrode tab side and the area between them. That is, along the length direction of the battery cell 10, the connecting segment 210 sequentially covers the bending structure 110 of the positive electrode tab and the bending structure 110 of the negative electrode tab.

[0048] Since the connecting section 210 covers the positive electrode tab side, the negative electrode tab side, and the area in between, the connecting section 210 is not only provided with a liquid outlet 211, but also with a vent hole that communicates with the explosion-proof valve 40 on the battery top cover 30 to ensure the safety of battery use.

[0049] Of course, the structure is not limited to the aforementioned strap 20 as a complete structure, such as... Figure 1 as well as Figures 3 to 5 As shown, in this embodiment, the strap 20 may also have two parts spaced apart along the length of the battery cell 10, wherein the connecting section 210 of one part covers the bending structure 110 of the positive electrode tab, and the connecting section 210 of the other part covers the bending structure 110 of the negative electrode tab.

[0050] The binding strap 20 is formed into two spaced-apart parts, which helps to improve the structural strength of the binding strap 20 and thus improve the stability of fixing the battery cell assembly. The binding strap 20 with the two-part structure adopted in this application has a liquid passage hole 211 on at least one of the two parts, corresponding to the liquid injection hole 310 on the battery top cover 30.

[0051] It should be noted that when the electrolyte injection hole 310 on the battery top cover 30 is located near the positive electrode tab or the negative electrode tab along the length of the cell 10, in order to improve the electrolyte injection efficiency, when the electrolyte passage hole 211 is only located on one of the connecting sections 210, it is generally located on the connecting section 210 opposite to the position of the electrolyte injection hole 310 on the battery top cover 30. To further improve the electrolyte injection efficiency, electrolyte passage holes 211 are provided on both connecting sections 210, which facilitates the electrolyte entering the battery through the electrolyte injection hole 310, providing more fluid channels for the electrolyte to wet the cell 10.

[0052] like Figure 1 as well as Figures 3 to 5 As shown, along the length of the battery cell 10, the extension lengths of the connecting sections 210 of the two parts are the same, so as to synchronously cover the bending structures 110 of the corresponding positive electrode tab and the bending structures 110 of the negative electrode tab; along the height of the battery cell 10, the extension lengths of the fixing sections 220 of the two parts are the same, so as to ensure that the two parts have the same stable connection effect.

[0053] The two-part structure of this application is spaced apart, so an air passage can be formed between the two parts to communicate with the explosion-proof valve 40. Therefore, neither part needs to be provided with an air passage hole. Of course, when the explosion-proof valve 40 is located at a different position from the area between the two parts, a corresponding air passage hole can be provided on the connecting section 210 of at least one part to ensure the safety of the battery.

[0054] like Figure 1 and Figure 5 As shown, this application provides a liquid passage hole 211 on the connecting section 210 of the strap 20 to ensure that when liquid needs to be injected through the injection hole 310, the strap 20 will not interfere with the flow of liquid. Thus, the strap 20 of this application can not only fix the battery cell assembly to overcome the problem of the separator being loose, but also the structure of the liquid passage hole 211 on the strap 20 ensures the smooth progress of the battery injection operation, which is conducive to ensuring the assembly efficiency of the battery cell assembly.

[0055] The liquid passage hole 211 can be provided as one or more. When there is one liquid passage hole 211, the diameter of the liquid passage hole 211 is not less than the diameter of the liquid injection hole 310 to ensure that the electrolyte flowing through the liquid injection hole 310 completely flows into the interior of the liquid passage hole 211, avoiding electrolyte overflow. Preferably, the liquid injection hole 310 and the liquid passage hole 211 are coaxial to further improve the liquid flow efficiency. When there are multiple liquid passage holes 211, the multiple liquid passage holes 211 form a mesh-like flow... In the liquid region, the projection of the injection hole 310 in the liquid-passing region is located inside the liquid-passing region. The area of ​​the mesh-like liquid-passing region is larger than the opening area of ​​the injection hole 310, so as to ensure that the electrolyte flows to the liquid-passing region first during the process of the electrolyte flowing from the injection hole 310 to the liquid-passing hole 211. Multiple liquid-passing holes 211 in the liquid-passing region allow electrolyte to flow. The multiple liquid-passing holes 211 have a microporous structure. The structure of the multiple liquid-passing holes 211 not only ensures the smooth flow of electrolyte, but also helps to strengthen the structural strength of the connecting section 210.

[0056] In this embodiment, the injection hole 310 is disposed near the positive electrode tab or near the negative electrode tab. Along the direction in which the multiple cells 10 are stacked, the positive or negative electrode tabs of the two middle cells 10 have bending structures arranged in opposite directions, and an avoidance area is formed between the two bending structures. The liquid passage hole 211 is disposed inside the avoidance area along the height direction of the cell 10.

[0057] The number of multiple battery cells 10 in this application can be four. The bending directions of the two positive electrode tabs of the two middle battery cells 10 are opposite, and the bending directions of the two negative electrode tabs of the two battery cells 10 are opposite.

[0058] When the injection hole 310 is located near the positive electrode tab, the corresponding clearance area is formed between the two bent structures of the positive electrode tab; when the injection hole 310 is located near the negative electrode tab, the corresponding clearance area is formed between the two bent structures of the negative electrode tab.

[0059] Of course, the positive and negative tabs in this application are set in a corresponding manner. The positive and negative tabs of the two middle cells adopt the same structural setting. The avoidance area formed by the bending structure of the two positive tabs and the bending structure of the two negative tabs extends along the length direction of the cell 10 and becomes the same avoidance area.

[0060] Specifically, along the stacking direction of the multiple cells 10, i.e. the thickness direction of the cell group, the liquid passage 211 is disposed inside the avoidance area. When there is only one liquid passage 211, the diameter of the liquid passage 211 is smaller than the distance between the two bending structures. When the liquid passage is formed into a mesh of multiple holes, the distance between the two ends of the liquid passage 211 is smaller than the distance between the two bending structures. This ensures that the liquid passage 211 will not cause the positive and negative electrode tabs to be exposed, thereby avoiding the occurrence of internal short circuits in the battery and improving the safety and performance of the battery.

[0061] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0062] The battery assembly of this application uses straps 20 to set the top surface and two large surfaces of the cell assembly, thereby fixing and binding the cell assembly to ensure the structural stability of the cell assembly. The structure of the straps 20 overcomes the expansion force of the separator. The structure of the straps 20 and the cell assembly in this application avoids the problem of separator loosening. The structural design of the battery assembly of this application improves the structural stability of the cell assembly, while ensuring battery performance and improving the safety of battery use.

[0063] This application provides a liquid passage hole 211 on the connecting section 210 of the strap 20 to ensure that when liquid needs to be injected through the injection hole 310, the strap 20 will not interfere with the flow of liquid. Thus, the strap 20 of this application can not only fix the battery cell assembly to overcome the problem of the separator being loose, but also the structure of the liquid passage hole 211 on the strap 20 ensures the smooth progress of the battery injection operation, which is conducive to ensuring the assembly efficiency of the battery cell assembly.

[0064] The connecting section 210 of the strap 20 in this application covers the positive electrode tab and the negative electrode tab, which helps to improve the safety of the structure and avoid the risk of open circuits caused by the exposed positive electrode tab and the negative electrode tab. At the same time, the strap 20 is set on the top surface of the bent structure 110, which helps to improve the stability of the abutment and fit between the bent structure 110 and the adapter piece 50, and helps to improve the stability of the connection between the positive electrode tab and the adapter piece 50, and between the negative electrode tab and the adapter piece 50, thereby improving the stability of the conductive structure of the battery.

[0065] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0066] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0067] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0068] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A battery assembly, characterized in that, include: Multiple battery cells (10) are stacked to form a battery cell group; A pair of adapter pieces (50) are respectively disposed on the positive electrode tab side and the negative electrode tab side of the battery cell assembly. The positive electrode tab and the negative electrode tab each have a bending structure (110), and the bending structure (110) is stacked on the top surface of the adapter piece (50). The strap (20) has a connecting section (210) extending along the stacking direction of the battery cells (10) and a fixing section (220) disposed at both ends of the connecting section (210). The connecting section (210) is disposed on the top surface of the battery cell assembly and covers the top surface of the bending structure (110). The fixing section (220) is disposed on two large surfaces on both sides of the battery cell assembly along the stacking direction of the plurality of battery cells (10). The connecting section (210) has a liquid passage hole (211).

2. The battery assembly according to claim 1, characterized in that, Along the length of the battery cell (10), the connecting section (210) sequentially covers the bending structure (110) of the positive electrode tab and the bending structure (110) of the negative electrode tab, and the connecting section (210) also has an air vent.

3. The battery assembly according to claim 1, characterized in that, The strap (20) has two parts spaced apart along the length of the battery cell (10), one part having a connecting segment (210) covering the bent structure (110) of the positive electrode tab, and the other part having a connecting segment (210) covering the bent structure (110) of the negative electrode tab, and at least one of the two parts having the liquid passage hole (211).

4. The battery assembly according to claim 3, characterized in that, Along the length direction of the battery cell (10), the connecting section (210) of the two parts extends to the same length; and / or Along the height direction of the battery cell (10), the fixed sections (220) of the two parts have the same extension length.

5. The battery assembly according to claim 1, characterized in that, The connecting segment (210) forms a projection of a first region on the top surface of the cell (10), and the bending structure (110) of the positive electrode tab and the bending structure (110) of the negative electrode tab form projections of a second region on the top surface of the cell (10), the second region being located inside the first region.

6. The battery assembly according to claim 1, characterized in that, One liquid passage (211) is provided; or Multiple liquid passage holes (211) are provided, and the multiple liquid passage holes (211) form a mesh-like liquid passage area.

7. The battery assembly according to claim 1, characterized in that, Along the height direction of the battery cell (10), the extension length H of the fixed segment (220) satisfies 10mm≤H≤40mm.

8. The battery assembly according to claim 1, characterized in that, The strap (20) is adhesive tape; and / or The connecting section (210) and the fixing section (220) are perpendicular, and the strap (20) is formed in an inverted U-shape; and / or Along the length of the battery cell (10), the adapter terminals (520) of the two adapter pieces (50) are disposed on both sides of the strap (20).

9. The battery assembly according to any one of claims 1 to 8, characterized in that, Along the stacking direction of the plurality of battery cells (10), the positive or negative electrode tabs of the two middle battery cells (10) have bending structures with opposite bending directions, and a clearance area is formed between the two bending structures. The liquid passage hole (211) is disposed inside the clearance area along the projection of the height direction of the battery cell (10).

10. A battery, characterized in that, The battery includes: The battery assembly according to any one of claims 1 to 9; A battery top cover (30) is disposed on the top of the strap (20) and the adapter piece (50). The battery top cover (30) has an injection hole (310) which is opposite to and communicates with the liquid passage hole (211).

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