Battery cell structure and battery

Abstract

The utility model relates to the technical field of batteries, in particular to a battery cell structure and a battery, the battery cell structure comprises a battery cell, the battery cell is provided with a first end and a second end which are oppositely arranged, the first end is convexly provided with a first tab, the second end is convexly provided with a second tab, the first tab is provided with a first welding surface, and the second tab is provided with a second welding surface; the first welding surface and the second welding surface are arranged towards the same side; the first tab fixing assembly is provided with a first fixing hole, and the first tab extends out of the first fixing hole; the second tab fixing assembly is provided with a second fixing hole, the second tab extends out of the second fixing hole, and the first tab and the second tab can be positioned in the same plane after extending out of the first fixing hole; according to the utility model, the first tab and the second tab can be welded and fixed at the same time after the first tab and the second tab are fixed at one time without turning over the battery cell structure, so that the welding consistency of the first tab and the second tab can be improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a cell structure and a battery. Background Technology

[0002] With the rapid development of society and the economy, energy and the environment have become increasingly important concerns. Lithium-ion batteries, as green and environmentally friendly energy storage devices, have been widely used in consumer electronics, energy storage, and electric vehicles due to their advantages such as high energy density, long cycle life, and low pollution. However, the increasing demand for lithium batteries has been hampered by the shortage of lithium resources. Sodium shares similar physicochemical properties with lithium. Sodium is the sixth most abundant element in the Earth's crust, with evenly distributed resources and low prices, making it a promising candidate for widespread application in energy storage and low-speed electric vehicles. In the past decade, research on sodium-ion batteries, which have similar working mechanisms and battery structures to lithium-ion batteries, has made rapid progress.

[0003] With the industry's increasing focus on sodium-ion batteries, both the technology and applications of sodium-ion batteries have developed rapidly. They can also replace lead-acid batteries and are expected to develop rapidly in multiple fields such as low-speed electric vehicles, electric boats, home / industrial energy storage, 5G communication base stations, data centers, large-scale access to renewable energy, and smart grids. This will promote the development of clean energy technology applications in my country and enhance my country's competitiveness and influence in the field of energy storage technology.

[0004] Sodium-ion batteries have a higher design current than lithium-ion batteries. Therefore, sodium-ion batteries require a larger welding area than lithium-ion batteries. As the welding area increases, the welding consistency of sodium-ion batteries is poor, which leads to a decrease in the overall performance of sodium-ion batteries. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model can ensure that the battery cell structure does not need to be flipped. After the first and second electrodes are fixed once, the first and second electrodes can be welded and fixed at the same time, which can improve the welding consistency of the first and second electrodes.

[0006] This utility model provides a battery cell structure, placed inside the battery cell housing, comprising:

[0007] The battery cell has a first end and a second end that are disposed opposite to each other. The first end has a first tab protruding from it, and the second end has a second tab protruding from it. The first tab has a first welding surface, and the second tab has a second welding surface. The first welding surface and the second welding surface are disposed facing the same side.

[0008] A first electrode fixing assembly fixedly disposed at the first end of the battery cell has a first fixing hole, through which the first electrode extends;

[0009] The second electrode fixing assembly, which is fixedly disposed at the second end of the battery cell, has a second fixing hole. The second electrode extends out of the second fixing hole and the first electrode extends out of the first fixing hole and the second electrode extends out of the second fixing hole, and can be located in the same plane.

[0010] Furthermore, the first tab and the second tab are symmetrically arranged at both ends of the battery cell.

[0011] Furthermore, the battery cell has a top surface and a bottom surface that are disposed opposite to each other;

[0012] In the direction from the top surface to the bottom surface, the distance between the first fixing hole and the top surface is less than the distance between the first fixing hole and the bottom surface;

[0013] In the direction from the top surface to the bottom surface, the distance between the second fixing hole and the top surface is less than the distance between the second fixing hole and the bottom surface.

[0014] Furthermore, the first electrode includes a first fixed end and a first free end connected to each other. The first fixed end is fixedly connected to the body of the battery cell, and the first free end protrudes from the first fixed hole. The bending direction of the first electrode is from the first free end toward the bottom surface.

[0015] The second electrode tab includes a second fixed end and a second free end that are connected to each other. The second fixed end is fixedly connected to the body of the battery cell, and the second free end protrudes from the second fixed hole. The bending direction of the second electrode tab is from the second free end toward the bottom surface.

[0016] Furthermore, after the first electrode tab is bent, there is a gap between the first electrode tab and the battery cell housing;

[0017] After the second electrode tab is bent, there is a gap between the second electrode tab and the battery cell housing.

[0018] Furthermore, the distance between the first fixing hole and the bottom surface is 110%-130% of the distance between the first fixing hole and the top surface;

[0019] The distance between the second fixing hole and the bottom surface is 110%-130% of the distance between the second fixing hole and the top surface.

[0020] Furthermore, the first electrode fixing assembly and the second electrode fixing assembly have the same structure, and the first electrode fixing assembly includes a first fixing member and a second fixing member that are connected to each other;

[0021] The first fixing hole is formed at the connection between the first fixing member and the second fixing member, and the first fixing member is located near the top surface.

[0022] Furthermore, both the first and second fasteners are sheet-like structures.

[0023] This utility model also protects a battery, including a cell casing, two sets of battery cover plates, and the cell structure as described above;

[0024] Both ends of the cell structure are electrically connected to the two sets of battery cover plates, respectively.

[0025] The battery cell housing has open ends on opposite sides, and the battery cover is respectively disposed on the open ends on both sides of the battery cell housing to form a sealed cavity, and the battery cell structure is disposed in the sealed cavity.

[0026] Furthermore, it also includes a first adapter plate and a second adapter plate;

[0027] The terminals of the first welding surface and the first set of battery cover plates are respectively welded and fixed to the welding surface of the first adapter piece;

[0028] The terminals of the second welding surface and the second set of battery cover plates are respectively welded and fixed to the welding surface of the second adapter piece, and the welding surfaces of the first adapter piece and the second adapter piece are both facing the bottom surface.

[0029] Implementing the embodiments of this utility model has the following beneficial effects:

[0030] This invention sets the first welding surface of the first tab and the second welding surface of the second tab to face the same direction, unlike the prior art where the welding surfaces of the two tabs face opposite directions, requiring two positioning welds by flipping. This design ensures that the cell structure can be fixed without flipping, and the first and second tabs can be welded and fixed simultaneously after being fixed once. This reduces process differences between the two sides during production, improves the welding consistency of the first and second tabs, and increases production efficiency. At the same time, by setting the first tab fixing component and the second tab fixing component, the first tab extending from the first fixing hole and the second tab extending from the second fixing hole can be located on the same plane, which further improves the welding consistency of the first and second tabs and ensures the performance of the cell structure. Attached Figure Description

[0031] To more clearly illustrate the technical solution of this utility model, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of this utility model. Those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0032] Figure 1 This is a structural diagram of the cell structure described in this embodiment after it is connected to the battery cover plate;

[0033] Figure 2 This is a top view of the cell structure described in this embodiment after it is connected to the battery cover plate;

[0034] Figure 3 This is a front view of the cell structure described in this embodiment after it is connected to the battery cover plate;

[0035] Figure 4 This is a structural diagram of the battery described in this embodiment;

[0036] Figure 5 for Figure 4 Enlarged image;

[0037] Figure 6 This is a structural diagram of the first electrode fixing assembly in this embodiment.

[0038] The corresponding reference numerals in the figure are as follows:

[0039] 1-Battery cell; 2-Battery cell housing; 3-Battery cover plate; 4-First adapter piece; 5-Second adapter piece; 6-First tab fixing assembly; 11-First tab; 12-Second tab; 13-Top surface; 14-Bottom surface; 61-First fixing component; 62-Second fixing component; 63-First fixing hole. Detailed Implementation

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

[0041] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model 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 utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0042] See appendix Figure 1-6 This embodiment provides a battery cell structure placed inside a battery cell housing 2, including: a battery cell 1 having a first end and a second end disposed opposite to each other; the first end having a first tab 11 protruding from it, and the second end having a second tab 12 protruding from it; the first tab 11 having a first welding surface, and the second tab 12 having a second welding surface; the first welding surface and the second welding surface being disposed facing the same side; a first tab fixing assembly 6 fixedly disposed at the first end of the battery cell 1 having a first fixing hole 63, through which the first tab 11 extends; and a second tab fixing assembly fixedly disposed at the second end of the battery cell 1 having a second fixing hole, through which the second tab 12 extends. After the first tab 11 and the second tab 12 extend from the first fixing hole 63, they can be located in the same plane.

[0043] It should be noted that in this embodiment, the first welding surface of the first tab 11 and the second welding surface of the second tab 12 are set to face the same direction, which is opposite to the welding surface orientation of the two tabs in the prior art, which requires two positioning weldings by flipping. This setting can ensure that the cell structure does not need to be flipped. After the first tab 11 and the second tab 12 are fixed once, the first tab 11 and the second tab 12 can be welded and fixed at the same time. This can reduce the process differences in the production process on both sides, improve the welding consistency of the first tab 11 and the second tab 12, and improve production efficiency. At the same time, by setting the first tab fixing component 6 and the second tab fixing component, the first tab 11 extending from the first fixing hole 63 and the second tab 12 extending from the second fixing hole can be located on the same plane. This can further improve the welding consistency of the first tab 11 and the second tab 12 and ensure the performance of the cell structure.

[0044] In this embodiment, by setting the first tab 11 and the second tab 12 in the same plane, flipping can be avoided. Compared with the prior art, the flipping process can be eliminated, the investment in flipping equipment can be reduced, and the welding time can be shortened.

[0045] After the cell structure in this embodiment is fabricated, it needs to be placed inside the cell housing 2. Simultaneously, the first tab 11 in the cell structure is welded and fixed to the first battery cover plate 3 via the first adapter piece 4. After welding and fixing, the first adapter piece 4 and the first tab 11 need to be bent so that the first battery cover plate 3 is fastened to one side of the opening end of the cell housing 2. The first battery cover plate 3 and the cell housing 2 are sealed together, forming a first receiving space. The first tab 11 divides the first receiving space into bending spaces. The second electrode 12 is welded and fixed to the second battery cover 3 via the second adapter piece 5. After welding and fixing, the second adapter piece 5 and the second electrode 12 need to be bent so that the second battery cover 3 is fastened to the other side opening end of the cell housing 2. The second battery cover 3 and the cell housing 2 are sealed together, and a second receiving space is formed between the second battery cover 3 and the cell housing 2. The second electrode 12 divides the second receiving space into a bending space and a receiving space, and the bending space is larger than the receiving space.

[0046] In some possible embodiments, the first tab 11 and the second tab 12 are symmetrically arranged at both ends of the cell 1. This arrangement can reduce the manufacturing difficulty of the first tab 11 and the second tab 12. At the same time, symmetrical arrangement of the first tab 11 and the second tab 12 can make the structure of the first tab fixing component 6 and the second tab fixing component the same, reducing the manufacturing cost and increasing the compatibility range of the first tab fixing component 6 and the second tab fixing component. More importantly, the symmetrical arrangement of the first tab 11 and the second tab 12 can further improve the welding consistency of the first tab 11 and the second tab 12, ensuring the performance of the cell structure.

[0047] In some possible embodiments, the battery cell 1 has a top surface 13 and a bottom surface 14 disposed opposite to each other; in the direction from the top surface 13 to the bottom surface 14, the distance between the first fixing hole 63 and the top surface 13 is less than the distance between the first fixing hole 63 and the bottom surface 14; in the direction from the top surface 13 to the bottom surface 14, the distance between the second fixing hole and the top surface 13 is less than the distance between the second fixing hole and the bottom surface 14. By restricting the positions of the first fixing hole 63 and the second fixing hole, the extension height of the first tab 11 and the second tab 12 can be restricted, that is, the distance between the first tab 11 and the second tab 12 and the top and bottom surfaces can be restricted. This restriction ensures that bending space is provided, and ensures that the tabs will not contact the battery cell housing 2 and short-circuit during the bending process, thus improving the safety of battery use.

[0048] In this embodiment, the top surface 13 and the bottom surface 14 can be arranged opposite each other, and the specific angle between the top surface 13 and the bottom surface 14 is not limited.

[0049] Preferably, the top surface 13, the bottom surface 14, the first welding surface of the first electrode 11, and the second welding surface of the second electrode 12 are arranged in parallel.

[0050] In this embodiment, the first fixing hole 63 and the second fixing hole are both located near the top surface 13. The first fixing hole 63 and the second fixing hole can be round holes, elliptical holes or elongated holes.

[0051] Preferably, the first fixing hole 63 is an elongated hole adapted to the first electrode tab 11, and the second fixing hole is an elongated hole adapted to the second electrode tab 12.

[0052] Specifically, the width of the first fixing hole 63 is 105-115% of the thickness of the first electrode tab 11, and the width of the second fixing hole is 105-115% of the thickness of the first electrode tab 11.

[0053] In some possible embodiments, the first tab 11 includes a first fixed end and a first free end connected to each other. The first fixed end is fixedly connected to the body of the battery cell 1, and the first free end protrudes from the first fixing hole 63. The bending direction of the first tab 11 is from the first free end toward the bottom surface 14. The second tab 12 includes a second fixed end and a second free end connected to each other. The second fixed end is fixedly connected to the body of the battery cell 1, and the second free end protrudes from the second fixing hole. The bending direction of the second tab 12 is from the second free end toward the bottom surface 14. By restricting the bending direction of the first tab 11 and the second tab 12, it is possible to ensure that the welding surfaces of the first tab 11 and the second tab 12 face the same direction. The bending space corresponding to the first tab 11 and the bending space corresponding to the second tab 12 are located on the same side of the battery cell 1. Compared with setting the bending space on both sides of the battery cell 1, the bending space in this embodiment is larger, which can provide sufficient bending space for both the first tab 11 and the second tab 12 at the same time, and minimize the probability of short circuit caused by contact between the tab and the battery cell housing 2.

[0054] In this embodiment, the bending space in the first accommodating space and the bending space in the second accommodating space are symmetrically arranged on both sides of the battery cell 1; the accommodating space in the first accommodating space and the accommodating space in the second accommodating space are symmetrically arranged on both sides of the battery cell 1.

[0055] See appendix Figure 5 The first electrode 11 and the first adapter piece 4 are disposed in the bending space of the first receiving space, and the second electrode 12 and the second adapter piece 5 are disposed in the bending space of the second receiving space.

[0056] See appendix Figure 1 and attached Figure 5As can be seen, the bending direction of the first adapter piece 4 is that the end away from the first electrode 11 bends towards the top surface 13, and the bending direction of the first electrode 11 is that the first free end bends towards the bottom surface 14; similarly, the bending direction of the second adapter piece 5 is that the end away from the second electrode 12 bends towards the top surface 13, and the bending direction of the second electrode 12 is that the second free end bends towards the bottom surface 14.

[0057] In some possible embodiments, after the first tab 11 is bent, there is a gap between the first tab 11 and the cell housing 2; after the second tab 12 is bent, there is a gap between the second tab 12 and the cell housing 2. By bending the first tab 11 and creating a gap between the first tab 11 and the cell housing 2, it is possible to prevent the first tab 11 from contacting the cell housing 2 and causing a short circuit; by bending the second tab 12 and creating a gap between the second tab 12 and the cell housing 2, it is possible to prevent the second tab 12 from contacting the cell housing 2 and causing a short circuit.

[0058] In this embodiment, the first tab 11 is spaced from the cell housing 2, that is, the first tab 11 is spaced from both the bending space and the accommodating space in the first accommodating space; the second tab 12 is spaced from the cell housing 2, that is, the second tab 12 is spaced from both the bending space and the accommodating space in the second accommodating space.

[0059] Specifically, the above-mentioned intervals are not limited, as long as the first tab 11 and the second tab 12 do not come into contact with the battery cell housing 2.

[0060] In some possible embodiments, the distance between the first fixing hole 63 and the bottom surface 14 is 110%-130% of the distance between the first fixing hole 63 and the top surface 13; the distance between the second fixing hole and the bottom surface 14 is 110%-130% of the distance between the second fixing hole and the top surface 13. The above settings can further clarify the specific position of the first fixing hole 63, and also clarify the specific position of the second fixing hole. Such restrictions can ensure that sufficient bending space is provided to ensure that the tab will not come into contact with the cell housing 2 and short-circuit during the bending process, thus improving the safety of battery use.

[0061] In this embodiment, the distance between the first fixing hole 63 and the bottom surface 14 is 110%-115%, 110%-120%, 115%-120%, 115%-130%, 120%-130%, or 125%-130% of the distance between the first fixing hole 63 and the top surface 13; the distance between the second fixing hole and the bottom surface 14 is 110%-115%, 110%-120%, 115%-120%, 115%-130%, 120%-130%, or 125%-130% of the distance between the second fixing hole and the top surface 13.

[0062] In some possible embodiments, the first tab fixing assembly 6 and the second tab fixing assembly have the same structure. The first tab fixing assembly 6 includes a first fixing member 61 and a second fixing member 62 that are connected to each other. A first fixing hole 63 is formed at the connection between the first fixing member 61 and the second fixing member 62. The first fixing member 61 is disposed near the top surface 13. The above configuration can simplify the structure of the first tab fixing assembly 6 and the second tab fixing assembly while ensuring the installation of the tab, and reduce the manufacturing cost.

[0063] In this embodiment, the shape of the first fixing member 61 and the second fixing member 62 after being connected to each other is adapted to the shape of the end face of the battery cell 1, thus ensuring the connection area between the first fixing member 61 and the second fixing member 62 and the battery cell 1, thereby ensuring the connection stability of the first electrode fixing assembly 6; similarly, the shape of the second electrode fixing assembly is adapted to the shape of the other end face of the battery cell 1, ensuring the connection area between the second electrode fixing assembly and the battery cell 1, thereby ensuring the connection stability of the second electrode fixing assembly.

[0064] In this embodiment, the length of the second fastener 62 in the direction from the top surface 13 to the bottom surface 14 is 110%-130% of the length of the first fastener 61.

[0065] Preferably, the length of the second fastener 62 is 110%-115%, 110%-120%, 115%-120%, 115%-130%, 120%-130%, or 125%-130% of the length of the first fastener 61.

[0066] In some possible embodiments, the first fixing member 61 and the second fixing member 62 are both sheet-like structures. The above configuration can simplify the structure of the first electrode fixing assembly 6 and reduce the manufacturing cost.

[0067] In this embodiment, the thickness of the first fixing member 61 and the second fixing member 62 is not limited, as long as the first fixing member 61 and the second fixing member 62 can fix and limit the first electrode tab 11.

[0068] This utility model also protects a battery, including a cell housing 2, two sets of battery cover plates 3, and the cell structure as described above; both ends of the cell structure are electrically connected to the two sets of battery cover plates 3 respectively; the cell housing 2 has open ends on opposite sides, and the battery cover plates 3 are respectively disposed on the open ends on both sides of the cell housing 2 to form a sealed cavity, and the cell structure is disposed in the sealed cavity. The battery in this embodiment includes the above-mentioned cell structure, so that after the first tab 11 and the second tab 12 are fixed once, the first tab 11 and the second tab 12 can be welded and fixed simultaneously, which can improve the welding consistency of the first tab 11 and the second tab 12 and improve production efficiency; at the same time, by setting the first tab fixing component 6 and the second tab fixing component, the first tab 11 extending from the first fixing hole 63 and the second tab 12 extending from the second fixing hole can be located on the same plane, which can further improve the welding consistency of the first tab 11 and the second tab 12 and ensure the performance of the cell structure.

[0069] In some possible embodiments, a first adapter piece 4 and a second adapter piece 5 are also included; the terminals of the first welding surface and the first set of battery cover plates 3 are respectively welded and fixed to the welding surface of the first adapter piece 4; the terminals of the second welding surface and the second set of battery cover plates 3 are respectively welded and fixed to the welding surface of the second adapter piece 5. The welding surfaces of the first adapter piece 4 and the second adapter piece 5 are both set facing the bottom surface 14. By setting the welding surfaces of the first adapter piece 4, the second adapter piece 5, the first welding surface of the first tab 11, and the second welding surface of the second tab 12 to the same orientation, it can be ensured that the cell structure does not need to be flipped. After the first tab 11 and the second tab 12 are fixed once, the first tab 11, the adapter piece 4 battery cover plate 3, the second adapter piece 5, and the second tab 12 can be welded and fixed at the same time. This can improve the welding consistency of the first tab 11, the adapter piece 4 battery cover plate 3, the second adapter piece 5, and the second tab 12.

[0070] In this embodiment, the terminals of both sets of battery cover plates 3 are arranged facing the top surface, and the first welding surface and the second welding surface are both arranged facing the top surface 13.

[0071] In this embodiment, the first adapter piece 4 has a first side and a second side arranged opposite to each other. The first side of the first adapter piece 4 faces the top surface 13, and the second side of the first adapter piece 4 faces the bottom surface 14. The terminals of the battery cover plate 3 and the first tab 11 are both arranged on the second side of the first adapter piece 4, that is, the second side of the first adapter piece 4 is welded and fixed to the terminals of the battery cover plate 3 and the first tab 11. The second adapter piece 5 has a first side and a second side arranged opposite to each other. The first side of the second adapter piece 5 faces the top surface 13, and the second side of the second adapter piece 5 faces the bottom surface 14. The terminals of the battery cover plate 3 and the second tab 12 are both arranged on the second side of the second adapter piece 5, that is, the second side of the second adapter piece 5 is welded and fixed to the terminals of the battery cover plate 3 and the second tab 12.

[0072] Battery assembly process: After the cell structure is assembled, it is placed in the cell housing 2, which has openings at both ends. The first tab 11 and the second tab 12 protrude from both ends of the cell housing 2. The first welding surface of the first tab 11 and the terminals on the first battery cover plate 3 are welded and fixed to the second side of the first adapter plate 4, respectively. The second welding surface of the second tab 12 and the terminals on the second battery cover plate 3 are welded and fixed to the second side of the second adapter plate 5, respectively. The first battery cover plate 3 is rotated to one end of the cell housing 2 and sealed. At this time, the first adapter plate 4 moves away from the first tab 11. One end of the first electrode 11 is bent toward the top surface 13, and the first free end of the first electrode 11 is bent toward the bottom surface 14. After bending, the first electrode 11 and the first adapter piece 4 are placed in the bending space in the first accommodating space. The second set of battery cover plates 3 are controlled to rotate to one end of the cell housing 2 and are sealed. At this time, the end of the second adapter piece 5 away from the second electrode 12 is bent toward the top surface 13, and the second free end of the second electrode 12 is bent toward the bottom surface 14. After bending, the second electrode 12 and the second adapter piece 5 are placed in the bending space in the second accommodating space. At this time, the assembly of the battery is completed.

[0073] Example 1

[0074] See appendix Figure 1-6 This embodiment provides a battery cell structure placed inside a battery cell housing 2, including: a battery cell 1 having a first end and a second end disposed opposite to each other; the first end having a first tab 11 protruding from it, and the second end having a second tab 12 protruding from it; the first tab 11 having a first welding surface, and the second tab 12 having a second welding surface; the first welding surface and the second welding surface being disposed facing the same side; a first tab fixing assembly 6 fixedly disposed at the first end of the battery cell 1 having a first fixing hole 63, through which the first tab 11 extends; and a second tab fixing assembly fixedly disposed at the second end of the battery cell 1 having a second fixing hole, through which the second tab 12 extends. After the first tab 11 and the second tab 12 extend from the first fixing hole 63, they can be located in the same plane.

[0075] In this embodiment, the first tab 11 and the second tab 12 are symmetrically arranged at both ends of the battery cell 1.

[0076] In this embodiment, the first tab 11 includes a first fixed end and a first free end connected to each other. The first fixed end is fixedly connected to the body of the battery cell 1, and the first free end protrudes from the first fixed hole 63. The bending direction of the first tab 11 is from the first free end toward the bottom surface 14. The second tab 12 includes a second fixed end and a second free end connected to each other. The second fixed end is fixedly connected to the body of the battery cell 1, and the second free end protrudes from the second fixed hole. The bending direction of the second tab 12 is from the second free end toward the bottom surface 14.

[0077] In this embodiment, after the first tab 11 is bent, there is a gap between the first tab 11 and the cell housing 2; after the second tab 12 is bent, there is a gap between the second tab 12 and the cell housing 2.

[0078] In this embodiment, the first tab 11 is spaced from the cell housing 2, that is, the first tab 11 is spaced from both the bending space and the accommodating space in the first accommodating space; the second tab 12 is spaced from the cell housing 2, that is, the second tab 12 is spaced from both the bending space and the accommodating space in the second accommodating space.

[0079] In this embodiment, the battery cell 1 has a top surface 13 and a bottom surface 14 disposed opposite to each other; in the direction from the top surface 13 to the bottom surface 14, the distance between the first fixing hole 63 and the top surface 13 is less than the distance between the first fixing hole 63 and the bottom surface 14; in the direction from the top surface 13 to the bottom surface 14, the distance between the second fixing hole and the top surface 13 is less than the distance between the second fixing hole and the bottom surface 14.

[0080] In this embodiment, the top surface 13 and the bottom surface 14 are arranged opposite to each other, and the top surface 13, the bottom surface 14, the first welding surface of the first electrode 11 and the second welding surface of the second electrode 12 are arranged in parallel.

[0081] In this embodiment, the first fixing hole 63 is an elongated hole adapted to the first electrode tab 11, and the second fixing hole is an elongated hole adapted to the second electrode tab 12; the width of the first fixing hole 63 is 105-115% of the thickness of the first electrode tab 11, and the width of the second fixing hole is 105-115% of the thickness of the first electrode tab 11.

[0082] In this embodiment, the distance between the first fixing hole 63 and the bottom surface 14 is 110%-130% of the distance between the first fixing hole 63 and the top surface 13; the distance between the second fixing hole and the bottom surface 14 is 110%-130% of the distance between the second fixing hole and the top surface 13.

[0083] In this embodiment, the distance between the first fixing hole 63 and the bottom surface 14 is 110%-115%, 110%-120%, 115%-120%, 115%-130%, 120%-130%, or 125%-130% of the distance between the first fixing hole 63 and the top surface 13; the distance between the second fixing hole and the bottom surface 14 is 110%-115%, 110%-120%, 115%-120%, 115%-130%, 120%-130%, or 125%-130% of the distance between the second fixing hole and the top surface 13.

[0084] In this embodiment, the first electrode fixing component 6 and the second electrode fixing component have the same structure. The first electrode fixing component 6 includes a first fixing member 61 and a second fixing member 62 that are connected to each other. A first fixing hole 63 is formed at the connection between the first fixing member 61 and the second fixing member 62. The first fixing member 61 is disposed near the top surface 13.

[0085] In this embodiment, the shape of the first fixing member 61 and the second fixing member 62 after being connected to each other is adapted to the end face shape of the battery cell 1; similarly, the shape of the second electrode fixing assembly is adapted to the other end face shape of the battery cell 1.

[0086] In this embodiment, the length of the second fastener 62 in the direction from the top surface 13 to the bottom surface 14 is 110%-130% of the length of the first fastener 61.

[0087] Preferably, the length of the second fastener 62 is 110%-115%, 110%-120%, 115%-120%, 115%-130%, 120%-130%, or 125%-130% of the length of the first fastener 61.

[0088] In this embodiment, both the first fixing member 61 and the second fixing member 62 are sheet-like structures.

[0089] In this embodiment, the thickness of the first fixing member 61 and the second fixing member 62 is not limited, as long as the first fixing member 61 and the second fixing member 62 can fix and limit the first electrode tab 11.

[0090] After the cell structure in this embodiment is fabricated, it needs to be placed inside the cell housing 2. Simultaneously, the first tab 11 in the cell structure is welded and fixed to the first battery cover plate 3 via the first adapter piece 4. After welding and fixing, the first adapter piece 4 and the first tab 11 need to be bent so that the first battery cover plate 3 is fastened to one side of the opening end of the cell housing 2. The first battery cover plate 3 and the cell housing 2 are sealed together, forming a first receiving space. The first tab 11 divides the first receiving space into bending spaces. The second electrode 12 is welded and fixed to the second battery cover 3 via the second adapter piece 5. After welding and fixing, the second adapter piece 5 and the second electrode 12 need to be bent so that the second battery cover 3 is fastened to the other side opening end of the cell housing 2. The second battery cover 3 and the cell housing 2 are sealed together, and a second receiving space is formed between the second battery cover 3 and the cell housing 2. The second electrode 12 divides the second receiving space into a bending space and a receiving space, and the bending space is larger than the receiving space.

[0091] In this embodiment, the bending space in the first accommodating space and the bending space in the second accommodating space are symmetrically arranged on both sides of the battery cell 1; the accommodating space in the first accommodating space and the accommodating space in the second accommodating space are symmetrically arranged on both sides of the battery cell 1.

[0092] See appendix Figure 5 The first electrode 11 and the first adapter piece 4 are disposed in the bending space of the first receiving space, and the second electrode 12 and the second adapter piece 5 are disposed in the bending space of the second receiving space.

[0093] See appendix Figure 1 and attached Figure 5 As can be seen, the bending direction of the first adapter piece 4 is that the end away from the first electrode 11 bends towards the top surface 13, and the bending direction of the first electrode 11 is that the first free end bends towards the bottom surface 14; similarly, the bending direction of the second adapter piece 5 is that the end away from the second electrode 12 bends towards the top surface 13, and the bending direction of the second electrode 12 is that the second free end bends towards the bottom surface 14.

[0094] This utility model also protects a battery, including a cell housing 2, two sets of battery cover plates 3 and the cell structure as described above; both ends of the cell structure are electrically connected to the two sets of battery cover plates 3 respectively; the cell housing 2 has open ends on opposite sides, and the battery cover plates 3 are respectively disposed at the open ends on both sides of the cell housing 2 to form a sealed cavity, and the cell structure is disposed in the sealed cavity.

[0095] In this embodiment, the battery also includes a first adapter piece 4 and a second adapter piece 5; the terminals of the first welding surface and the first set of battery cover plates 3 are respectively welded and fixed to the welding surface of the first adapter piece 4; the terminals of the second welding surface and the second set of battery cover plates 3 are respectively welded and fixed to the welding surface of the second adapter piece 5, and the welding surfaces of the first adapter piece 4 and the second adapter piece 5 are both arranged facing the bottom surface 14.

[0096] In this embodiment, the terminals of both sets of battery cover plates 3 are arranged facing the top surface, and the first welding surface and the second welding surface are both arranged facing the top surface 13.

[0097] In this embodiment, the first adapter piece 4 has a first side and a second side arranged opposite to each other. The first side of the first adapter piece 4 faces the top surface 13, and the second side of the first adapter piece 4 faces the bottom surface 14. The terminals of the battery cover plate 3 and the first tab 11 are both arranged on the second side of the first adapter piece 4, that is, the second side of the first adapter piece 4 is welded and fixed to the terminals of the battery cover plate 3 and the first tab 11. The second adapter piece 5 has a first side and a second side arranged opposite to each other. The first side of the second adapter piece 5 faces the top surface 13, and the second side of the second adapter piece 5 faces the bottom surface 14. The terminals of the battery cover plate 3 and the second tab 12 are both arranged on the second side of the second adapter piece 5, that is, the second side of the second adapter piece 5 is welded and fixed to the terminals of the battery cover plate 3 and the second tab 12.

[0098] Although the present invention has been described through preferred embodiments, the present invention is not limited to the embodiments described herein, and includes various changes and variations without departing from the scope of the present invention.

[0099] In this document, the directional terms such as front, back, top, and bottom are defined according to the positions of the components in the accompanying drawings and the positions between the components, and are only used for clarity and convenience in expressing the technical solution. It should be understood that the use of these directional terms should not limit the scope of protection claimed by this utility model.

[0100] Where there is no conflict, the above embodiments and features described herein can be combined with each other.

[0101] The above-disclosed embodiment is merely a preferred embodiment of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A battery cell structure, placed inside a battery cell housing (2), characterized in that, include: The battery cell (1) has a first end and a second end arranged opposite to each other. The first end is provided with a first tab (11) and the second end is provided with a second tab (12). The first tab (11) has a first welding surface and the second tab (12) has a second welding surface. The first welding surface and the second welding surface are arranged facing the same side. A first electrode fixing assembly (6) is fixedly disposed at the first end of the battery cell (1), having a first fixing hole (63), through which the first electrode (11) extends; The second tab fixing assembly fixedly disposed at the second end of the battery cell (1) has a second fixing hole. The second tab (12) extends out of the second fixing hole. After the first tab (11) extends out of the first fixing hole (63) and the second tab (12) extends out of the second fixing hole, they can be located in the same plane.

2. The cell structure according to claim 1, characterized in that, The first tab (11) and the second tab (12) are symmetrically arranged at both ends of the battery cell (1).

3. The cell structure according to claim 1, characterized in that, The battery cell (1) has a top surface (13) and a bottom surface (14) disposed opposite to each other; In the direction from the top surface (13) to the bottom surface (14), the distance between the first fixing hole (63) and the top surface (13) is less than the distance between the first fixing hole (63) and the bottom surface (14); In the direction from the top surface (13) to the bottom surface (14), the distance between the second fixing hole and the top surface (13) is less than the distance between the second fixing hole and the bottom surface (14).

4. The cell structure according to claim 3, characterized in that, The first tab (11) includes a first fixed end and a first free end connected to each other. The first fixed end is fixedly connected to the body of the battery cell (1), and the first free end protrudes from the first fixed hole (63). The bending direction of the first tab (11) is from the first free end toward the bottom surface (14). The second tab (12) includes a second fixed end and a second free end connected to each other. The second fixed end is fixedly connected to the body of the battery cell (1), and the second free end protrudes from the second fixed hole. The bending direction of the second tab (12) is from the second free end toward the bottom surface (14).

5. The cell structure according to claim 4, characterized in that, After the first electrode tab (11) is bent, there is a gap between the first electrode tab (11) and the battery cell housing (2); After the second electrode tab (12) is bent, there is a gap between the second electrode tab (12) and the battery cell housing (2).

6. The cell structure according to claim 3, characterized in that, The distance between the first fixing hole (63) and the bottom surface (14) is 110%-130% of the distance between the first fixing hole (63) and the top surface (13); The distance between the second fixing hole and the bottom surface (14) is 110%-130% of the distance between the second fixing hole and the top surface (13).

7. The cell structure according to any one of claims 1-6, characterized in that, The first electrode fixing assembly (6) and the second electrode fixing assembly have the same structure. The first electrode fixing assembly (6) includes a first fixing member (61) and a second fixing member (62) that are connected to each other. The first fixing hole (63) is formed at the connection between the first fixing member (61) and the second fixing member (62), and the first fixing member (61) is disposed near the top surface (13).

8. The cell structure according to claim 7, characterized in that, Both the first fastener (61) and the second fastener (62) are sheet-like structures.

9. A battery, characterized in that, It includes a cell housing (2), two sets of battery cover plates (3), and a cell structure as described in any one of claims 1-8; The two ends of the cell structure are electrically connected to the two sets of battery cover plates (3); The battery cell housing (2) has open ends on opposite sides, and the battery cover plate (3) is respectively disposed on the open ends on both sides of the battery cell housing (2) to form a sealed cavity, and the battery cell structure is disposed in the sealed cavity.

10. The battery according to claim 9, characterized in that, It also includes a first adapter plate (4) and a second adapter plate (5); The terminals of the first welding surface and the first set of battery cover plates (3) are respectively welded and fixed to the welding surface of the first adapter piece (4); The terminals of the second welding surface and the second set of battery cover plates (3) are respectively welded and fixed to the welding surface of the second adapter piece (5). The welding surfaces of the first adapter piece (4) and the second adapter piece (5) are both set facing the bottom surface (14).

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