Battery and battery module

Abstract

The utility model discloses a battery and a battery module. The battery comprises a battery cell, a tab and a lead-out piece, the tabs comprise a positive tab and a negative tab; the tabs are connected with the battery cell; one end of the lead-out piece is connected with the positive tab and the negative tab, and the other end extends out of the battery and is connected with an external circuit to enable the battery to output current. Through the arrangement, the lead-out piece is directly connected with the positive lug and the negative lug, so that the distance and the flatness between the positive lug and the negative lug are always kept consistent. And after the battery is packaged, the thickness of a packaging area between the single lead-out piece and the positive and negative tabs is uniform, so that the manufacturing process is simplified, the manufacturing cost is reduced, and the manufacturing efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly relates to a battery and a battery module. Background Art

[0002] In traditional battery packaging processes, the extended metal sheets of the positive and negative electrode tabs are assembled independently. This requires that during the welding process, the metal sheets of the positive and negative electrode tabs must maintain precise center distances and parallelism, which places higher requirements on the debugging of equipment and the stability of the production process, increases the manufacturing cost, and may reduce the overall consistency of the product. In addition, during the top sealing of the aluminum plastic film, since the extended metal sheets of the positive and negative electrode tabs are assembled independently, there are regions with different thicknesses in the sealing area, including the aluminum plastic film area, the positive electrode metal sheet area, and the negative electrode metal sheet area. This structure not only increases the complexity of the sealing design but may also cause bonding problems between the aluminum plastic films, between the aluminum plastic film and the metal sheets, affecting the convenience of equipment debugging and product type change, and further affecting the packaging consistency and safety of the product. Battery products may face safety risks such as liquid leakage and short circuits, and may even lead to safety accidents. Summary of the Utility Model

[0003] The purpose of the present application is to provide a battery and a battery module to solve the problem of poor consistency at the packaging of the positive and negative electrode tabs of the battery.

[0004] To achieve the purpose of the present application, the following technical solutions are provided in the present application:

[0005] In a first aspect, the present utility model provides a battery, including a battery cell, electrode tabs, and an extraction member; the electrode tabs include a positive electrode tab and a negative electrode tab, and the electrode tabs are connected to the battery cell; the extraction member is connected to the positive electrode tab and the negative electrode tab.

[0006] In an implementation, the extraction member includes a first metal sheet, a second metal sheet, and a connecting member. Both the first metal sheet and the second metal sheet are connected to the connecting member. The first metal sheet is connected to the positive electrode tab, and the second metal sheet is connected to the negative electrode tab.

[0007] In an implementation, both the first metal sheet and the second metal sheet extend in a first direction, the first direction being the extraction direction of the electrode tabs, and the connecting member extends in a second direction, and the first direction and the second direction intersect.

[0008] In an implementation, the connecting member is provided with a first hole and a second hole, both the first hole and the second hole penetrating the connecting member along the first direction. The first metal sheet is inserted through the first hole, and the second metal sheet is inserted through the second hole.

[0009] In one embodiment, the first metal sheet includes a first section, the second metal sheet includes a second section, the first section extends from the first hole toward one side of the battery cell, the second section extends from the second hole toward one side of the battery cell, and the length H1 of the first section and the length H2 of the second section satisfy 0.95 ≤ H1 / H2 ≤ 1.05.

[0010] In one embodiment, the first metal sheet includes a third section, the second metal sheet includes a fourth section, the third section extends from the first hole away from one side of the battery cell, the fourth section extends from the second hole away from one side of the battery cell, and the length H3 of the third section and the length H4 of the fourth section satisfy 0.95 ≤ H3 / H4 ≤ 1.05.

[0011] In one embodiment, the length of the third section is greater than or equal to the length of the first section, and the length of the fourth section is greater than or equal to the length of the second section.

[0012] In one embodiment, the thickness of the connecting member is 0.2 mm to 0.5 mm.

[0013] In one embodiment, the battery further includes an aluminum plastic film, and the aluminum plastic film covers the outer periphery of the battery cell and the connecting member.

[0014] In a second aspect, the present utility model provides a battery module, which includes a battery box body and the battery according to any one of the first aspect, and the battery is received in the battery box body.

[0015] The present utility model provides a battery, which includes a battery cell, pole ears, and a lead-out member; the pole ears include a positive pole ear and a negative pole ear, and the pole ears are connected to the battery cell; one end of the lead-out member is connected to the positive pole ear and the negative pole ear, and the other end extends to the outside of the battery and is connected to an external circuit so that the battery outputs current. Through the above arrangement, the lead-out member is directly connected to the positive pole ear and the negative pole ear, thereby ensuring that the distance and flatness between the positive pole ear and the negative pole ear are always consistent. After the battery is encapsulated, the thickness of the encapsulation area between a single lead-out member and the positive pole ear and the negative pole ear is uniform, simplifying the manufacturing process, reducing the manufacturing cost, and improving the manufacturing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a schematic diagram of a battery in an embodiment;

[0018] Figure 2 Schematic diagram of a lead-out component of an embodiment;

[0019] Figure 3 Top view schematic diagram of a lead-out component of an embodiment;

[0020] Figure 4 Top view schematic diagram of a lead-out component of yet another embodiment.

[0021] Explanation of reference numerals in the drawings: 1 - battery cell, 2 - positive tab, 3 - negative tab, 4 - lead-out component, 41 - first metal sheet, 42 - second metal sheet, 43 - connecting member; 5 - aluminum-plastic film, X - first direction, Y - second direction. Detailed implementation manners

[0022] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0023] It should be noted that when a component is referred to as being "fixed to" another component, it can be directly on the other component or there may also be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component at the same time.

[0024] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs. The terms used in the present application in the specification are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The term "and / or" used in the present application includes any and all combinations of one or more of the related listed items.

[0025] Next, some embodiments of the present application will be described in detail in conjunction with the accompanying drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0026] In one embodiment, please refer to Figures 1-4 , the present utility model provides a battery, including a battery cell 1, tabs, and a lead-out component 4; the tabs include a positive tab 2 and a negative tab 3, and the tabs are connected to the battery cell 1; the lead-out component 4 is connected to the positive tab 2 and the negative tab 3.

[0027] Both the positive tab 2 and the negative tab 3 are respectively connected to the battery cell 1 as the inlets and outlets of current, so that current can be output from the battery cell 1 for use by an external circuit.

[0028] In some embodiments of the present application, the positive electrode tab 2 and the negative electrode tab 3 are composite multi-layer laminated structures; the positive electrode tab 2 and the negative electrode tab 3 are respectively connected to the battery cell 1, and a packaging process is required to package the connection points of the positive electrode tab 2 and the negative electrode tab 3 with the battery cell 1 and the battery cell 1 to form a battery, and the composite multi-layer laminated positive electrode tab 2 and negative electrode tab 3 are packaged inside the battery. One end of the lead-out member 4 is connected to the positive electrode tab 2 and the negative electrode tab 3, and the other end extends to the outside of the battery and is connected to an external circuit so that the battery outputs current.

[0029] In current batteries, it is necessary to separately provide lead-out members 4 for the positive electrode tab 2 and the negative electrode tab 3, and connect the two separate lead-out members 4 to the positive electrode tab 2 and the negative electrode tab 3 respectively, resulting in different spacings and flatnesses between the two separate lead-out members 4, increasing the manufacturing cost and at the same time reducing the product consistency. By providing a single lead-out member 4, the single lead-out member 4 can be directly connected to the positive electrode tab 2 and the negative electrode tab 3, thereby ensuring that the spacing and flatness between the positive electrode tab 2 and the negative electrode tab 3 are always consistent, reducing the deviation caused by multiple lead-out members 4; simplifying the manufacturing process, reducing the manufacturing cost, and improving the manufacturing efficiency. After the two separate lead-out members 4 are connected to the positive electrode tab 2 and the negative electrode tab 3, in the process of packaging with packaging materials, different thicknesses of packaging areas will be formed in the packaging area, increasing the difficulty of product design and processing, equipment debugging, and product model change, and at the same time affecting the packaging consistency of the product, adding potential safety hazards to the product packaging safety. In serious cases, safety accidents such as battery leakage and short circuit may occur to the battery product. In the present application, a single lead-out member 4 is provided, and the single lead-out member 4 reduces the complexity of the packaging area, and the thickness of the packaging area is uniform. When packaging, only the structure and position of the single lead-out member 4 need to be considered; thus, the packaging process is simple and efficient, maintaining the consistency of product packaging, and reducing the design complexity and processing difficulty.

[0030] The present utility model provides a battery, including a battery cell 1, electrode tabs, and a lead-out member 4; the electrode tabs include a positive electrode tab 2 and a negative electrode tab 3, and the electrode tabs are connected to the battery cell 1; one end of the lead-out member 4 is connected to the positive electrode tab 2 and the negative electrode tab 3, and the other end extends to the outside of the battery and is connected to an external circuit so that the battery outputs current. Through the above arrangement, the lead-out member 4 is directly connected to the positive electrode tab 2 and the negative electrode tab 3, thereby ensuring that the spacing and flatness between the positive electrode tab 2 and the negative electrode tab 3 are always consistent. After the battery is packaged, the thickness of the packaging area is uniform, reducing the deviation caused by multiple lead-out members 4; simplifying the manufacturing process, reducing the manufacturing cost, and improving the manufacturing efficiency.

[0031] In one embodiment, please refer to Figure 2 , the lead-out member 4 includes a first metal sheet 41, a second metal sheet 42, and a connecting member 43. The first metal sheet 41 and the second metal sheet 42 are both connected to the connecting member 43. The first metal sheet 41 is connected to the positive electrode tab 2, and the second metal sheet 42 is connected to the negative electrode tab 3.

[0032] Both the first metal sheet 41 and the second metal sheet 42 are connected to the connecting piece 43, and the first metal sheet 41 is connected to the positive electrode tab 2, and the second metal sheet 42 is connected to the negative electrode tab 3. The formed structure enables the lead-out piece 4 to be connected to the positive electrode tab 2 and the negative electrode tab 3 as a whole at the same time. Currently, separate lead-out pieces 4 are respectively connected to the positive electrode tab 2 and the negative electrode tab 3. During the process of connecting the first metal sheet 41 to the positive electrode tab 2 and the second metal sheet 42 to the negative electrode tab 3, it is necessary to ensure the center distance and parallelism between the first metal sheet 41 and the second metal sheet 42, which brings difficulties to equipment debugging and process stability, increases the manufacturing cost, and also reduces the product consistency.

[0033] In some embodiments of the application, it is necessary to seal the battery. During the sealing forming process, the contact sections of the connecting piece 43 with the first metal sheet 41 and the second metal sheet 42 need to be sealed inside the battery. Then, through hot pressing, it is closed through the connecting piece 43. After hot pressing, the first metal sheet 41 and the second metal sheet 42 are connected together through a connecting piece 43, and the lead-out piece 4 as a whole is connected to the positive electrode tab 2 and the negative electrode tab 3. Due to the determined positional relationship among the first metal sheet 41, the second metal sheet 42, and the connecting piece 43, there is no need to additionally increase processes to ensure the center distance and parallelism between the first metal sheet 41 and the second metal sheet 42, reducing the manufacturing cost and improving the production efficiency.

[0034] In one embodiment, the first metal sheet 41 and the second metal sheet 42 can be but are not limited to aluminum, stainless steel, nickel, and nickel-plated copper.

[0035] In one embodiment, the connecting piece 43 can be but is not limited to insulating hot melt adhesives such as PP glue (polypropylene).

[0036] In one embodiment, the connection method between the first metal sheet 41 and the positive electrode tab 2 can be but is not limited to welding, bonding, and riveting;

[0037] The connection method between the second metal sheet 42 and the negative electrode tab 3 is the same and will not be elaborated here.

[0038] In one embodiment, please refer to Figure 2 , both the first metal sheet 41 and the second metal sheet 42 extend in the first direction X, the first direction X is the lead-out direction of the electrode tab, the connecting piece 43 extends in the second direction Y, and the first direction X and the second direction Y intersect.

[0039] After the battery is encapsulated, both the positive electrode tab 2 and the negative electrode tab 3 are encapsulated inside the battery; a first metal sheet 41 and a second metal sheet 42 extending along the first direction X are provided, and the first metal sheet 41 and the second metal sheet 42 extend to the outside along the lead-out direction of the electrode tab, so that the first metal sheet 41 and the second metal sheet 42 are connected to the outside, enabling the battery to output current. In some embodiments of the present application, the first direction X and the second direction Y are perpendicular, and the connecting member 43 extends along the second direction Y, which can more effectively utilize the limited space, make the battery design more compact, and provide the energy density of the battery; maintain the consistency of encapsulation and reduce the thickness non-uniformity of the encapsulation area caused by non-uniform encapsulation.

[0040] In one implementation, the connecting member 43 is provided with a first hole and a second hole, both the first hole and the second hole penetrate the connecting member 43 along the first direction X, the first metal sheet 41 is inserted into the first hole, and the second metal sheet 42 is inserted into the second hole.

[0041] Both the first hole and the second hole penetrate the connecting member 43 along the first direction X, so that the first metal sheet 41 and the second metal sheet 42 are respectively inserted into the first hole and the second hole. The positions of the first metal sheet 41 and the second metal sheet 42 can be effectively fixed to prevent the first metal sheet 41 and the second metal sheet 42 from shifting. The metal sheets are inserted into the connecting member 43, which can enhance the mechanical strength of the overall structure and improve the impact resistance of the battery; and since the insertion positions of the first metal sheet 41 and the second metal sheet 42 are fixed, the assembly error is reduced, and the consistency of battery encapsulation can be maintained. The method of providing the first hole and the second hole in the connecting member 43 can be, but is not limited to, mechanical drilling, laser cutting, ultrasonic machining, integral injection molding, integral extrusion molding, or directly coating the material of the connecting member 43 on the outer periphery of the first metal sheet 41 and the second metal sheet 42.

[0042] In one implementation, please refer to Figure 1 and Figure 2 , the first metal sheet 41 includes a first section, the second metal sheet 42 includes a second section, the first section extends out from the side of the first hole facing the battery cell 1, the second section extends out from the side of the second hole facing the battery cell 1, and the length H1 of the first section and the length H2 of the second section satisfy 0.95 ≤ H1 / H2 ≤ 1.05. The ratio of the length H1 of the first section to the length H2 of the second section can be, but is not limited to, 0.95, 0.96, 0.97, 0.98, 0.998, 1, 1.01, 1.02, 1.03, 1.04, 1.05.

[0043] After the battery is encapsulated, the first section and the second section are respectively the sections of the first metal sheet 41 and the second metal sheet 42 encapsulated inside the battery. The ratio of the length H1 of the first section to the length H2 of the second section is within this range, and the lengths of the first section and the second section are close, which can simplify the production process, eliminating the need to adjust the lengths of the two metal sheets separately, reducing the variables in the production process, reducing the adjustment and calibration steps in the production process, contributing to cost reduction and improving product consistency; it can also reduce mechanical stress caused by length differences, thereby improving the mechanical stability of the first metal sheet 41 and the second metal sheet 42 and providing a stable electrical connection. When the ratio of the length H1 of the first section to the length H2 of the second section is less than 0.95, it indicates that the length of the first section is less than that of the second section, and the difference is relatively large; this results in different distances and flatness between the first metal sheet 41 and the second metal sheet 42, increasing the manufacturing cost and reducing product consistency at the same time. When the ratio of the length H1 of the first section to the length H2 of the second section is greater than 1.05, it indicates that the length of the first section is greater than that of the second section, and the difference is relatively large; this also leads to different distances and flatness between the first metal sheet 41 and the second metal sheet 42, increasing the manufacturing cost and reducing product consistency at the same time.

[0044] In one embodiment, the first metal sheet 41 includes a third section, and the second metal sheet 42 includes a fourth section. The third section extends from the side of the first hole facing away from the battery cell 1, and the fourth section extends from the side of the second hole facing away from the battery cell 1. The ratio of the length H3 of the third section to the length H4 of the fourth section satisfies 0.95 ≤ H3 / H4 ≤ 1.05. The ratio of the length H3 of the third section to the length H4 of the fourth section can be but is not limited to 0.95, 0.96, 0.97, 0.98, 0.998, 1, 1.01, 1.02, 1.03, 1.04, 1.05.

[0045] After the battery is encapsulated, the third section and the fourth section are respectively the sections where the first metal sheet 41 and the second metal sheet 42 extend into the external space of the battery. The ratio of the length H3 of the third section to the length H4 of the fourth section is within this range, and the lengths of the third section and the fourth section are close. This can simplify the production process, eliminating the need to adjust the lengths of the two metal sheets separately, reducing the variables in the production process, and helping to improve product consistency. It can also reduce the mechanical stress caused by the length difference, thereby improving the mechanical stability of the first metal sheet 41 and the second metal sheet 42 and providing a stable electrical connection. At the same time, since the lengths of the third section and the fourth section are close, their contact pressures and contact areas with the external connection are similar, thus providing a stable electrical connection. When the ratio of the length H3 of the third section to the length H4 of the fourth section is less than 0.95, it indicates that the length of the third section is less than that of the fourth section and the difference is relatively large. This causes the spacing and flatness of the first metal sheet 41 and the second metal sheet 42 to be different, increasing the manufacturing cost and reducing product consistency, resulting in an unstable electrical connection. When the ratio of the length H3 of the third section to the length H4 of the fourth section is greater than 1.05, it indicates that the length of the third section is greater than that of the fourth section and the difference is relatively large. This also causes the spacing and flatness of the first metal sheet 41 and the second metal sheet 42 to be different, increasing the manufacturing cost and reducing product consistency, resulting in an unstable electrical connection.

[0046] In one embodiment, please refer to Figure 1 , the length of the third section is greater than or equal to the length of the first section, and the length of the fourth section is greater than or equal to the length of the second section.

[0047] As the parts of the first metal sheet 41 and the second metal sheet 42 extending to the outside of the battery, the lengths of the third section and the fourth section are greater than or equal to the lengths of the corresponding first section and second section inside, which can ensure a more stable external connection and reduce connection problems caused by insufficient length. It is also easier to align and fix with an external circuit board or connector, simplifying the assembly process.

[0048] In one embodiment, the thickness of the connecting piece 43 is 0.2 mm to 0.5 mm. The thickness of the connecting piece 43 can be but is not limited to 0.2 mm, 0.26 mm, 0.3 mm, 0.36 mm, 0.4 mm, 0.5 mm.

[0049] The thickness of the connecting member 43 is within this range. The thickness of the connecting member 43 matches the thickness of the battery cell 1, which can ensure close fitting during the encapsulation process, ensure the close fitting of the encapsulation material, have a uniform thickness at the connecting member 43, reduce the risk of gas and liquid leakage, and improve the sealing performance of the battery. The certain thickness of the connecting member 43 can provide additional mechanical strength to protect the battery from external impacts and vibrations. An appropriate thickness of the connecting member 43 can ensure good contact between the first metal sheet 41 and the second metal sheet 42. When the thickness of the connecting member 43 is less than 0.2 mm, the thickness of the connecting member 43 is insufficient to provide sufficient mechanical strength and cannot withstand the mechanical stress of the battery during transportation and use, resulting in deformation or fracture of the connecting member 43; the too-thin connecting member 43 is difficult to fit closely with the encapsulation material, affecting the sealing performance of the battery and increasing the encapsulation difficulty. When the thickness of the connecting member 43 is greater than 0.5 mm, the too-thick connecting member 43 increases the transfer of the heat sealing temperature, making the temperature of the connecting member 43 much lower than the temperature of the encapsulation material, difficult to fit closely with the encapsulation material, affecting the sealing performance of the battery and increasing the encapsulation difficulty; the too-thick connecting member 43 will increase the volume and weight of the battery, resulting in a decrease in the energy density per unit weight of the battery; and the redundant use of the material of the connecting member 43 increases the material cost.

[0050] In one embodiment, please refer to Figure 4 , the battery further includes an aluminum-plastic film 5, and the aluminum-plastic film 5 covers the outer peripheries of the battery cell 1 and the connecting member 43.

[0051] Setting the aluminum-plastic film 5 to cover the outer peripheries of the battery cell 1 and the connecting member 43 can protect the battery cell 1 and the connecting member 43 from the influence of the external environment. The sealing performance of the aluminum-plastic film 5 helps to prevent the leakage of the electrolyte inside the battery, ensure the integrity of the battery, and thus extend the service life of the battery.

[0052] In some embodiments of the present application, a single PP glue connecting member 43 is connected to the first metal sheet 41 and the second metal sheet 42, and the first metal sheet 41 and the second metal sheet 42 are respectively welded to the positive electrode tab 2 and the negative electrode tab 3. When welding, there is no need to debug the first metal sheet 41 and the second metal sheet 42 respectively, avoiding the occurrence of poor center distance and inclination of the first metal sheet 41 and the second metal sheet 42 during the production process. At the same time, when the battery is subjected to the top-sealing edge encapsulation of the aluminum-plastic film 5, the head structure design is simple, and there is no need to design corresponding pole ear slots according to the two PP glue connecting members 43; at the same time, the debugging corresponding to the two PP glue connecting members 43 during the production process is avoided, simplifying the equipment debugging work. After the battery is subjected to the top-sealing edge encapsulation of the aluminum-plastic film 5, the sealing edge has the same thickness, simplifying the product process, improving the product consistency, facilitating control and improving the encapsulation stability, improving the battery encapsulation quality and consistency, and reducing the safety risks such as virtual sealing and liquid leakage and over-sealing and short circuit of the battery cell 1.

[0053] In one embodiment, the present utility model further provides a battery module, which includes a battery box body and a battery according to any one of the above embodiments, and the battery is housed in the battery box body.

[0054] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is the orientation or positional relationship based on the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0055] The above-disclosed is only a preferred embodiment of the present application. Of course, the scope of the rights of the present application cannot be limited thereby. Those of ordinary skill in the art can understand all or part of the processes of implementing the above embodiments, and the equivalent changes made according to the claims of the present application still fall within the scope covered by the present application.

Claims

1. A battery, characterized in that, Comprising: Cell; Tab, including a positive tab and a negative tab, the tab being connected to the cell; Lead-out member, connecting the positive tab and the negative tab; The lead-out member includes a first metal sheet, a second metal sheet and a connecting member, the first metal sheet and the second metal sheet are both connected to the connecting member, the first metal sheet is connected to the positive tab, and the second metal sheet is connected to the negative tab.

2. The battery according to claim 1, characterized in that, The first metal sheet and the second metal sheet both extend in a first direction, the first direction being the lead-out direction of the tab, the connecting member extends in a second direction, and the first direction and the second direction intersect.

3. The battery according to claim 2, characterized in that, The connecting member is provided with a first hole and a second hole, both the first hole and the second hole penetrate the connecting member along the first direction, the first metal sheet is inserted into the first hole, and the second metal sheet is inserted into the second hole.

4. The battery according to claim 3, characterized in that, The first metal sheet includes a first section, the second metal sheet includes a second section, the first section extends out from the side of the first hole facing the cell, the second section extends out from the side of the second hole facing the cell, and the length H1 of the first section and the length H2 of the second section satisfy 0.95 ≤ H1 / H2 ≤ 1.

05.

5. The battery according to claim 4, wherein The first metal sheet includes a third section, the second metal sheet includes a fourth section, the third section extends out from the side of the first hole facing away from the cell, the fourth section extends out from the side of the second hole facing away from the cell, and the length H3 of the third section and the length H4 of the fourth section satisfy 0.95 ≤ H3 / H4 ≤ 1.

05.

6. The battery according to claim 5, characterized in that, The length of the third section is greater than or equal to the length of the first section, and the length of the fourth section is greater than or equal to the length of the second section.

7. The battery according to any one of claims 2-6, characterized in that, The thickness of the connecting member is 0.2 mm to 0.5 mm.

8. The battery according to any one of claims 2-6, characterized in that, The battery further includes an aluminum-plastic film, and the aluminum-plastic film covers the outer periphery of the cell and the connecting member.

9. A battery module, characterized in that, Including a battery case and the battery according to any one of claims 1-8, the battery being received in the battery case.

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