battery

Abstract

This invention relates to the field of battery technology and proposes a battery comprising: a battery casing with an electrolyte injection hole; and a battery cell disposed within the battery casing, the battery cell including a cell body and a tab, the tab extending from the side of the cell body, the electrolyte injection hole located on the side of the cell body near the tab, and the electrolyte injection hole being disposed on the surface of the battery casing opposite the large surface of the tab; wherein, in a direction perpendicular to the extension direction of the cell body and the tab, the minimum vertical distance between the electrolyte injection hole and the tab is 'a', the width of the cell body is 'b', and 5 ≤ b / a ≤ 20, which not only avoids the impact of electrolyte injection on the tab but also ensures the width of the tab, thereby ensuring the current carrying capacity of the cell and the charge / discharge rate of the battery, thus improving the battery's performance.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to a battery. Background Technology

[0002] In related technologies, the battery casing is provided with a liquid injection hole to allow liquid to be injected into the battery. The location of the liquid injection hole and its relationship with the tabs of the battery cell directly affect the overall liquid injection effect and the safety performance of the battery. Summary of the Invention

[0003] This invention provides a battery to improve battery performance.

[0004] This invention provides a battery comprising:

[0005] Battery casing, with a liquid injection hole provided on the battery casing;

[0006] The battery cell is housed inside the battery casing. The battery cell includes a battery cell body and a tab. The tab extends from the side of the battery cell body. The liquid injection hole is located on the side of the battery cell body near the tab and is located on the surface of the battery casing opposite the large surface of the tab.

[0007] Among them, in the direction perpendicular to the extension direction of the cell body and the tab, the minimum vertical distance between the liquid injection hole and the tab is a, the width of the cell body is b, and 5≤b / a≤20.

[0008] The battery of this invention includes a battery casing and a battery cell. The battery casing has an injection port. The tab of the battery cell extends from the side of the cell body. The injection port is located on the side of the cell body near the tab, and is positioned on the surface of the battery casing opposite the large surface of the tab, allowing for convenient electrolyte injection into the battery casing. Along the width direction of the cell body, the minimum vertical distance between the injection port and the tab is 'a', and the width of the cell body is 'b', where 5 ≤ b / a ≤ 20. This not only prevents the electrolyte from impacting the tab during injection but also ensures the width of the tab, thereby guaranteeing the cell's current carrying capacity and the battery's charge / discharge rate, thus improving battery performance. Attached Figure Description

[0009] To better understand this disclosure, reference may be made to the embodiments shown in the following figures. Components in the figures are not necessarily to scale, and related elements may be omitted to emphasize and clearly illustrate the technical features of this disclosure. Additionally, related elements or components may have different arrangements as known in the art. Furthermore, in the figures, the same reference numerals denote the same or similar components in various figures. Wherein:

[0010] Figure 1This is a schematic diagram of the structure of a battery according to an exemplary embodiment;

[0011] Figure 2 This is an exploded structural diagram of a battery according to an exemplary embodiment;

[0012] Figure 3 This is a partially enlarged structural schematic diagram of a battery according to an exemplary embodiment.

[0013] The annotations in the attached figures are explained as follows:

[0014] 10. Battery casing; 11. Injection hole; 12. First surface; 13. Second surface; 14. First casing component; 15. Second casing component; 16. Recess; 20. Battery cell; 21. Battery cell body; 22. Terminal tab; 30. Terminal assembly. Detailed Implementation

[0015] The technical solutions in the exemplary embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. The exemplary embodiments described herein are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of this disclosure.

[0016] In the description of this disclosure, unless otherwise expressly specified and limited, the terms “first” and “second” are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term “multiple” refers to two or more; and the term “and / or” includes any and all combinations of one or more associated listed items. In particular, references to “the / described” object or “a” object are also intended to indicate one of a possible plurality of such objects.

[0017] Unless otherwise specified or stated, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0018] Furthermore, it should be understood that the directional terms such as "upper," "lower," "inner," and "outer" described in the exemplary embodiments of this disclosure are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the exemplary embodiments of this disclosure. It should also be understood that, in the context of a reference to an element or feature being connected to another element(s) "upper," "lower," "inner," or "outer," it can be directly connected to the other element(s) "upper," "lower," "inner," or "outer," or indirectly connected to the other element(s) "upper," "lower," "inner," or "outer" through an intermediate element.

[0019] One embodiment of the present invention provides a battery, please refer to... Figures 1 to 3 The battery includes: a battery casing 10, on which an injection hole 11 is provided; and a battery cell 20, which is disposed inside the battery casing 10. The battery cell 20 includes a battery cell body 21 and a tab 22. The tab 22 extends from the side of the battery cell body 21. The injection hole 11 is located on the side of the battery cell body 21 near the tab 22, and the injection hole 11 is disposed on the surface of the battery casing 10 opposite to the large surface of the tab 22. The minimum vertical distance between the injection hole 11 and the tab 22 in the direction perpendicular to the extension direction of the battery cell body 21 and the tab 22 is a, and the width of the battery cell body 21 is b, where 5 ≤ b / a ≤ 20.

[0020] An embodiment of the present invention provides a battery comprising a battery casing 10 and a battery cell 20. The battery casing 10 has an injection hole 11. The tab 22 of the battery cell 20 extends from the side of the battery cell body 21. The injection hole 11 is located on the side of the battery cell body 21 near the tab 22, and is positioned on the surface of the battery casing 10 opposite the large surface of the tab 22, thus facilitating electrolyte injection into the battery casing 10. Along the width direction of the battery cell body 21, the minimum vertical distance between the injection hole 11 and the tab 22 is 'a', and the width of the battery cell body 21 is 'b', where 5 ≤ b / a ≤ 20. This not only prevents the tab 22 from impacting during electrolyte injection but also ensures the width of the tab 22, thereby guaranteeing the current carrying capacity of the battery cell 20 and the charge / discharge rate of the battery, thus improving the battery's performance.

[0021] It should be noted that the tab 22 extends from the side of the cell body 21, and the injection hole 11 is located on the side of the cell body 21 close to the tab 22. That is, the tab 22 and the injection hole 11 are located on the same side of the cell body 21. Therefore, when injecting electrolyte through the injection hole 11, it is necessary to control the distance between the tab 22 and the injection hole 11 to ensure that the electrolyte can be reliably injected without affecting other structures.

[0022] During the process of injecting electrolyte into the battery casing 10, efforts should be made to avoid the electrolyte directly impacting the tab 22. When the value of b / a is too large, the distance between the tab 22 and the injection hole 11 is too close, which makes it easy for the electrolyte to spray onto the tab 22 during battery injection. This not only affects the wetting rate of the electrolyte, but also causes the tab 22 to be eroded, resulting in structural damage.

[0023] When the value of b / a is too small, the distance between the tab 22 and the injection hole 11 is too large. In this case, the tab 22 will be too small, which will affect the current carrying capacity of the cell and the charge and discharge rate of the battery. At the same time, the tab 22 will generate a lot of heat, which will affect the safe use of the battery. Alternatively, if the distance between the tab 22 and the injection hole 11 is too large, the injection hole 11 will be too close to the end of the battery casing 10, which will affect the diffusion of electrolyte to the battery.

[0024] The injection hole 11 is used to inject liquid into the battery casing 10, and can be sealed by a sealing structure after the liquid injection is completed. There can be at least two injection holes 11, and the at least two injection holes 11 can be symmetrical about the intersection of the first diagonal direction and the second diagonal direction of the battery casing 10.

[0025] It should be noted that the cell body 21 includes two or more electrode plates, and the tab portion 22 includes two or more single-piece tabs. Each single-piece tab extends from its corresponding electrode plate. The width of a single-piece tab can be smaller than the width of the electrode plate. Multiple single-piece tabs are stacked to form the tab portion 22, which is connected to the electrode lead-out structure. For example, the tab portion 22 can be electrically connected to the electrode post assembly. The single-piece tab is made of a metal foil with good electrical and thermal conductivity, such as aluminum, copper, or nickel. The width direction of the cell body 21 can be considered as the width direction of a single electrode plate. The direction perpendicular to the extension direction of the cell body 21 and the tab portion 22 is the width direction of a single electrode plate. The width direction of the tab portion 22 is parallel to the direction perpendicular to the extension direction of the cell body 21 and the tab portion 22.

[0026] Combination Figure 3 As shown, in the direction perpendicular to the extension direction of the cell body 21 and the tab 22, that is, along the width direction of the cell body 21, the minimum vertical distance between the injection hole 11 and the tab 22 is 'a', and the width of the cell body 21 is 'b', where 5 ≤ b / a ≤ 20. The ratio between the width b of the cell body 21 and the minimum vertical distance a between the injection hole 11 and the tab 22 can be 5, 5.5, 6, 6.5, 7, 7.5, 8, 9, 10, 11, 12, 13, 14, 15, 16, 16.5, 17, 17.5, 18, 18.5, 19, 19.5, 19.8, 19.9, or 20, etc.

[0027] In one embodiment, combined Figure 3 As shown, along the width direction of the cell body 21, the width of the tab 22 is c, where 1.5 ≤ b / (c+a) ≤ 3. This ensures that the tab 22 has a relatively large width dimension, and there is a certain distance between the tab 22 and the electrolyte injection hole 11. This not only avoids the tab 22 from being impacted during electrolyte injection, but also ensures the overcurrent capacity of the cell 20 and the charge / discharge rate of the battery, thereby improving the battery's performance. b / (c+a) can be 1.5, 1.6, 1.7, 2, 2.5, 2.8, 2.9, or 3, etc.

[0028] It should be noted that, along the width direction of the cell body 21, the minimum vertical distance between the injection hole 11 and the tab 22 is a, the width of the cell body 21 is b, the width of the tab 22 is c, 5≤b / a≤20, 1.5≤b / (c+a)≤3. The distance between the tab 22 and the injection hole 11 is reasonable, and it can ensure that the size of the tab 22 is reasonable. Furthermore, the injection hole 11 will not be too close to the end of the battery casing 10, so as to meet the rapid wetting of the electrolyte and avoid the electrolyte damaging the tab 22.

[0029] In one embodiment, combined Figure 3 As shown, the injection hole 11 includes a circular hole, and the orthographic projection of the tab 22 on the surface of the battery casing 10 where the injection hole 11 is provided is spaced apart from the circular hole; wherein, the radius of the circular hole is r, and the minimum vertical distance between the center of the circular hole and the tab 22 is d, a=dr. Designing the injection hole 11 as a circular hole not only facilitates the forming of the injection hole 11, but also facilitates the injection of electrolyte. Furthermore, it also facilitates the control of the distance between the injection hole 11 and the tab 22, and even if the electrolyte impacts the tab 22, it can avoid the problem of excessive electrolyte impact on the tab 22.

[0030] In one embodiment, the width of the tab 22 is c, where 20mm ≤ c ≤ 60mm. This ensures the overall current carrying capacity of the cell 20 while leaving space for other structures within the battery, facilitating the installation of other structures, such as the installation of the liquid injection hole 11.

[0031] The width c of the tab 22 can be 20mm, 21mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 57mm, 58mm, 59mm or 60mm, etc.

[0032] In one embodiment, the radius of the injection hole 11 is r, 1.2mm≤r≤2.5mm. This not only ensures that the electrolyte can be injected quickly through the injection hole 11, but also avoids the injection hole 11 being too large and affecting the structural strength of the battery casing 10. It also avoids the injection hole 11 being too large and occupying too much space, thus reserving space for the arrangement of other structures.

[0033] The radius r of the injection hole 11 can be 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.4mm or 2.5mm, etc.

[0034] In one embodiment, the width of the cell body 21 is b, where 70mm ≤ b ≤ 120mm. This ensures that the battery has sufficient capacity while avoiding the problem of the cell body 21 being too thick, thus facilitating the fabrication of the cell 20.

[0035] The width b of the battery cell body 21 can be 70mm, 71mm, 72mm, 75mm, 80mm, 85mm, 90mm, 95mm, 98mm, 100mm, 105mm, 110mm, 112mm, 115mm, 118mm, 119mm or 120mm, etc.

[0036] In one embodiment, the distance between the end of the tab 22 away from the cell body 21 and the cell body 21 is greater than the maximum vertical distance between the injection hole 11 and the cell body 21. That is, the maximum vertical distance between the orthographic projection of the tab 22 on the surface of the battery housing 10 where the injection hole 11 is provided and the cell body 21 is greater than the maximum vertical distance between the injection hole 11 and the cell body 21. Compared with the injection hole 11, the tab 22 can be closer to the end of the battery housing 10. This avoids reducing the structural strength of the battery housing 10 by the injection hole 11 being too close to the end of the battery housing 10, while also ensuring that the electrolyte can quickly penetrate after being injected into the battery housing 10.

[0037] Combination Figure 3 As shown, the maximum vertical distance between the orthographic projection of the tab 22 on the surface of the battery housing 10 where the liquid injection hole 11 is provided and the cell body 21 is greater than the maximum vertical distance between the liquid injection hole 11 and the cell body 21. Therefore, it can be considered that the first distance between the left end of the tab 22 and the left end of the first housing member 14 is less than the second distance between the left end of the liquid injection hole 11 and the left end of the first housing member 14.

[0038] In one embodiment, along the length of the cell body 21, the minimum vertical distance between the injection hole 11 and the cell body 21 is less than the minimum vertical distance between the injection hole 11 and the outer circumferential edge of the battery casing 10. That is, the distance between the injection hole 11 and the outer circumferential edge of the battery casing 10 is greater than the distance between the injection hole 11 and the cell body 21. This can prevent the injection hole 11 from being too close to the end of the battery casing 10, which would reduce the structural strength of the battery casing 10, while also ensuring that the electrolyte can quickly penetrate the battery casing 10 after being injected into it.

[0039] Combination Figure 3 As shown, the minimum vertical distance between the injection hole 11 and the cell body 21 is less than the minimum vertical distance between the injection hole 11 and the outer edge of the battery casing 10. Therefore, it can be considered that the distance between the left end of the injection hole 11 and the left end of the first casing 14 is greater than the distance between the right end of the injection hole 11 and the left end of the cell body 21.

[0040] In one embodiment, such as Figure 1 As shown, the battery housing 10 includes two opposing first surfaces 12 and four second surfaces 13 arranged around the first surfaces 12. The area of ​​the first surfaces 12 is larger than the area of ​​the second surfaces 13. The injection hole 11 is disposed on the first surface 12, so that the first surface 12 can provide a reliable support surface for the injection hole 11 and facilitate the setting and injection of the injection hole 11.

[0041] It should be noted that the two opposing first surfaces 12 are the large surfaces of the battery housing 10, while the four second surfaces 13 are the small surfaces of the battery housing 10. The four second surfaces 13 include two pairs of small surfaces, namely a first pair of small surfaces extending along the length direction of the battery housing 10 and a second pair of small surfaces extending along the width direction of the battery housing 10. The area of ​​the first pair of small surfaces is larger than the area of ​​the second pair of small surfaces, but both are smaller than the area of ​​the large surfaces.

[0042] In one embodiment, such as Figure 1 and Figure 2 As shown, the battery casing 10 includes: a first casing member 14; a second casing member 15, the second casing member 15 being connected to the first casing member 14 to enclose the battery cell 20; wherein, the first casing member 14 is a flat plate, and the liquid injection hole 11 is disposed on the first casing member 14, which not only facilitates the setting of the liquid injection hole 11, but also makes the structure of the first casing member 14 relatively simple, thereby improving the battery forming efficiency.

[0043] In one embodiment, the battery casing 10 may be made of stainless steel or aluminum, which has good corrosion resistance and sufficient strength. The battery casing 10 is generally rectangular.

[0044] It should be noted that the first housing component 14 and the second housing component 15 can be set independently, such as... Figure 2 As shown. In some embodiments, it is not excluded that the first housing member 14 and the second housing member 15 can be an integral structure, formed by stamping to accommodate the battery cell 20, and then sealed by welding.

[0045] In one embodiment, such as Figure 1 and Figure 2 As shown, the battery also includes a terminal assembly 30. The terminal assembly 30 is disposed on the battery housing 10 and is connected to the tab 22 of the cell 20. The terminal assembly 30 and the liquid injection hole 11 are arranged along the width direction of the battery housing 10, which not only facilitates the subsequent connection of the terminal assembly 30 to the busbar, but also makes full use of the space of the battery housing 10, thereby ensuring that the cell 20 and other structures can be reasonably arranged inside the battery housing 10, thereby improving the space utilization rate of the battery housing 10.

[0046] In some embodiments, there are two terminal post assemblies 30, which are a positive terminal post assembly and a negative terminal post assembly, respectively. Each terminal post assembly 30 may include two terminals to increase the overcurrent capacity of the battery. There are also two tabs 22, which are a positive tab and a negative tab, respectively. The positive terminal post assembly and the positive tab are connected together, and the negative terminal post assembly and the negative tab are connected together.

[0047] It should be noted that the terminal assembly 30 and the battery casing 10 can be insulated from each other. For example, they can be insulated using an insulating component or an insulating coating. No limitation is made here, and the choice can be made according to actual needs. In some embodiments, it is not excluded that one terminal assembly 30 can be electrically connected to the battery casing 10.

[0048] In one embodiment, a recess 16 is provided on the battery housing 10, and the terminal assembly 30 is located in the recess 16, thereby avoiding the terminal assembly 30 from occupying the battery pack stacking space, thereby improving the energy density of the battery pack.

[0049] In one embodiment, such as Figure 1 and Figure 2 As shown, a recess 16 is provided on the battery housing 10. The terminal assembly 30 and the recess 16 are located on opposite surfaces of the battery housing 10. The recess 16 is used to accommodate the terminal assembly of another battery. Thus, when the batteries are assembled, the terminal assembly of another battery can be accommodated in the recess 16, thereby avoiding the terminal assembly from occupying the space between the two batteries, reducing the distance between two adjacent batteries, and thus improving the energy density of the battery pack.

[0050] In one embodiment, such as Figure 1 and Figure 2As shown, there can be two pole post assemblies 30 and two recesses 16. The two pole post assemblies 30 can be disposed on one first surface 12, and the two recesses 16 can be disposed on another first surface 12.

[0051] In one embodiment, the length of the battery is L, 400mm≤L≤2500mm, the width of the battery is K, the height of the battery is G, 2K≤L≤50K, and / or 0.5G≤K≤20G.

[0052] Furthermore, 50mm≤K≤200mm, 10mm≤G≤100mm.

[0053] Preferably, 4K≤L≤25K, and / or 2G≤K≤10G.

[0054] In the above embodiments, the battery has a large length-to-width ratio while ensuring sufficient energy density, and further, a large width-to-height ratio.

[0055] In one embodiment, the length of the battery is L and the width of the battery is K, where 4K≤L≤7K. That is, the ratio of the battery length to the width in this embodiment is relatively large, thereby increasing the energy density of the battery and facilitating the subsequent formation of a battery pack.

[0056] In one embodiment, the height of the battery is G, where 3G≤K≤7G. The ratio of the battery width to its height is relatively large, which facilitates its formation while ensuring sufficient energy density.

[0057] Optionally, the battery length can be 500mm-1500mm, the battery width can be 80mm-150mm, and the battery height can be 15mm-35mm.

[0058] It should be noted that the length of the battery is the dimension along its length, the width of the battery is the dimension along its width, and the height of the battery is the dimension along its height, i.e., the thickness of the battery.

[0059] In one embodiment, the battery is a stacked battery, which is not only convenient to assemble, but also allows for the processing of batteries with longer lengths.

[0060] A battery consists of a cell and an electrolyte, and is the smallest unit capable of electrochemical reactions such as charging and discharging. A cell is a unit formed by winding or laminating stacked portions, including a first electrode, a separator, and a second electrode. When the first electrode is the positive electrode, the second electrode is the negative electrode. The polarities of the first and second electrodes can be interchanged.

[0061] Specifically, the cell 20 is a stacked cell, which has a first electrode layered on top of each other, a second electrode layer with the opposite electrical charge to the first electrode layer, and a separator layer disposed between the first electrode layer and the second electrode layer, so that multiple pairs of first electrode layers and second electrode layers are stacked to form a stacked cell.

[0062] Optionally, the battery can be a wound battery, which involves winding a first electrode, a second electrode with the opposite electrical charge to the first electrode, and a separator disposed between the first and second electrodes to obtain a wound battery cell.

[0063] An embodiment of the present invention also provides a battery pack comprising the aforementioned battery.

[0064] According to one embodiment of the present invention, the battery pack includes a battery casing 10 and a battery cell 20. The battery casing 10 has an injection hole 11. The tab 22 of the battery cell 20 extends from the side of the battery cell body 21. The injection hole 11 is located on the side of the battery cell body 21 near the tab 22, and is positioned on the surface of the battery casing 10 opposite the large surface of the tab 22, thus facilitating electrolyte injection into the battery casing 10. Along the width direction of the battery cell body 21, the minimum vertical distance between the injection hole 11 and the tab 22 is 'a', and the width of the battery cell body 21 is 'b', where 5 ≤ b / a ≤ 20. This not only prevents the tab 22 from impacting during electrolyte injection but also ensures the width of the tab 22, thereby guaranteeing the current carrying capacity of the battery cell 20 and the charge / discharge rate of the battery, thus improving the performance of the battery pack.

[0065] In one embodiment, the battery pack is a battery module or a battery pack.

[0066] The battery module includes multiple batteries, and may also include end plates and side plates for fixing the multiple batteries.

[0067] It should be noted that multiple batteries can be assembled into a battery module and then installed inside the battery box. These batteries can be secured using end plates and side plates. Alternatively, multiple batteries can be directly installed inside the battery box without needing to be grouped together; in this case, the end plates and side plates can be removed.

[0068] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and exemplary embodiments are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

[0069] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of protection of this disclosure is limited only by the appended claims.

Claims

1. A battery, characterized in that, The battery has a length L, where 400mm ≤ L ≤ 2500mm, and a height G, where 10mm ≤ G ≤ 100mm. The battery comprises: A battery housing (10) is provided with a liquid injection hole (11). The battery housing (10) includes two opposing first surfaces (12) and four second surfaces (13) arranged around the first surfaces (12). The area of ​​the first surface (12) is larger than the area of ​​the second surface (13). The liquid injection hole (11) is provided on the first surface (12). The battery cell (20) is disposed inside the battery casing (10). The battery cell (20) includes a battery cell body (21) and a tab (22). The tab (22) extends from the side of the battery cell body (21). The liquid injection hole (11) is located on the side of the battery cell body (21) near the tab (22). The liquid injection hole (11) is disposed on the surface of the battery casing (10) opposite to the large surface of the tab (22). The terminal assembly (30) is disposed on the battery housing (10), the terminal assembly (30) is connected to the tab (22), the terminal assembly (30) and the liquid injection hole (11) are disposed on the same first surface (12) and are disposed along the width direction of the battery housing (10); Wherein, in the direction perpendicular to the extension direction of the cell body (21) and the tab (22), the minimum vertical distance between the injection hole (11) and the tab (22) is a, the width of the cell body (21) is b, 5≤b / a≤20, 70mm≤b≤120mm, the distance between the end of the tab (22) away from the cell body (21) and the cell body (21) is greater than the maximum vertical distance between the injection hole (11) and the cell body (21), and along the length direction of the cell body (21), the minimum vertical distance between the injection hole (11) and the cell body (21) is less than the minimum vertical distance between the injection hole (11) and the circumferential outer edge of the battery casing (10).

2. The battery according to claim 1, characterized in that, Along the width direction of the main body (21) of the battery cell, the width of the tab (22) is c, 1.5≤b / (c+a)≤3.

3. The battery according to claim 2, characterized in that, The injection hole (11) includes a circular hole, and the orthographic projection of the tab (22) on the surface of the battery housing (10) where the injection hole (11) is provided is spaced apart from the circular hole; Wherein, the radius of the circular hole is r, the minimum vertical distance between the center of the circular hole and the tab (22) is d, and a=dr.

4. The battery according to claim 2, characterized in that, 20mm≤c≤60mm.

5. The battery according to claim 3, characterized in that, 1.2mm≤r≤2.5mm.

6. The battery according to any one of claims 1 to 5, characterized in that, The battery casing (10) includes: First housing component (14); The second housing component (15) is connected to the first housing component (14) to enclose the battery cell (20). The first housing component (14) is a flat plate, and the liquid injection hole (11) is disposed on the first housing component (14).

Images