Battery with multiple liquid injection holes

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery with multiple liquid injection holes. The battery comprises a battery shell, a pole and a plurality of liquid injection holes, wherein the battery shell comprises a shell end surface and a shell side surface connected to the shell end surface; the pole is arranged on the battery shell; at least one liquid injection hole is formed in the pole, and at least two liquid injection holes are formed in the end face of the shell at the same time; and / or at least two liquid injection holes are formed in the side face of the shell at the same time. Through the arrangement, compared with the mode that only two liquid injection holes are formed in the battery shell, the number of the liquid injection holes is larger, so that the working efficiency can be further improved, and the time and labor cost is further reduced. Besides, the electrolyte can be more uniformly distributed in each part of the battery shell, the dead angle of liquid injection is reduced, and a user can select to inspect the interior of the battery shell from the liquid injection hole in the pole or the liquid injection hole in the battery shell, so that the inspection flexibility of the user is improved, and the operation difficulty is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a multi -liquid injection hole battery. BACKGROUND

[0002] The existing battery mostly adopts single liquid injection hole design, and has the defects such as long electrolyte injection time and low injection efficiency, thereby leading to low production efficiency.

[0003] In view of the above problems, the existing related technology provides a double liquid injection hole battery, two liquid injection holes are arranged on the battery shell, the injection efficiency can be improved, the exhaust area during the baking of the battery can be increased, the diffusion distance of moisture can be shortened, and the pre-charging negative pressure discharge efficiency can be improved, thereby improving the working efficiency and reducing the time cost.

[0004] Based on the above, there is an urgent need for a multi-liquid injection hole battery to solve the problems in the prior art. UTILITY MODEL CONTENT

[0005] The utility model aims at providing a multi-liquid injection hole battery, which is used to solve the problem that the injection efficiency of the existing battery is still not high during use and still cannot meet the higher injection efficiency demand in the actual production process.

[0006] To achieve this purpose, the utility model adopts the following technical scheme:

[0007] The multi-liquid injection hole battery comprises a battery shell, a pole, a plurality of liquid injection holes, and / or at least two liquid injection holes are arranged on the shell side surface.

[0008] As a preferred, the battery shell comprises two shell end surfaces, the shell side surface is connected between the two shell end surfaces, one liquid injection hole is arranged on each of the two shell end surfaces, the shortest distance from the edge of the shell end surface to the center of the liquid injection hole located on the shell end surface is d1, and 5mm≤d1≤13mm.

[0009] As a preferred, the multi-liquid injection hole battery comprises two poles, one pole is arranged on each of the two shell end surfaces, and the liquid injection hole is arranged through the at least one pole.

[0010] As a preferred, the multi-injection hole battery comprises two said pole posts, both of which are arranged on the side of the shell, and the injection hole is arranged through at least one of the pole posts.

[0011] As a preferred, the injection hole is arranged through both of the pole posts.

[0012] As a preferred, at least two injection holes are arranged on the side of the shell, and the shortest distance from the edge of the side of the shell to the center of the injection hole on the side of the shell is d2, 5mm≤d2≤75mm.

[0013] As a preferred, the battery shell comprises two said shell sides,

[0014] Among the at least two injection holes, one or part of the injection holes are arranged on one of the shell sides, and the rest of the injection holes are arranged on the other shell side.

[0015] Alternatively, all of the at least two injection holes are arranged on one of the shell sides.

[0016] As a preferred, the inner diameter of the injection hole gradually increases along the direction from the inner side wall of the battery shell to the outer side wall of the battery shell.

[0017] As a preferred, the injection hole comprises a first hole section and a second hole section, the diameter of the first hole section is larger than that of the second hole section, the first hole section is closer to the outer side wall of the battery shell than the second hole section, and the inner diameter of the second hole section gradually increases along the direction from the inner side wall of the battery shell to the outer side wall of the battery shell.

[0018] As a preferred, the included angle between the inner side wall of the injection hole and the axis of the injection hole is α, 5°≤α≤35°.

[0019] The beneficial effects of the utility model are as follows:

[0020] The utility model provides a kind of multi-liquid injection hole battery, by being provided with liquid injection hole on pole and battery shell, compared with the mode that two liquid injection holes are only provided on battery shell, the number of liquid injection hole is more, so that liquid injection nozzle can be injected electrolyte from the liquid injection hole provided on battery shell and pole simultaneously into battery shell, to make that liquid injection efficiency, pre-charging negative pressure exhaust efficiency is higher, so as to further improve work efficiency, further reduce time and manpower cost.In addition, by increasing liquid injection hole on pole, it can be ensured that electrolyte can be more evenly distributed in each part of battery shell when liquid injection, reduce liquid injection dead angle, and user can select from the liquid injection hole on pole or from the liquid injection hole on battery shell to check inside battery shell, improve the checking flexibility of user, to reduce operation difficulty. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the structural schematic diagram of the multi-liquid injection hole battery provided by the utility model embodiment one;

[0022] Figure 2 It is the side view of the multi-liquid injection hole battery provided by the utility model embodiment one;

[0023] Figure 3 It is the section view along A-A in Figure 2

[0024] Figure 4 It is the local enlarged view of B in Figure 3

[0025] Figure 5 It is the structural schematic diagram of the multi-liquid injection hole battery provided by the utility model embodiment two;

[0026] Figure 6 It is the plan view of the multi-liquid injection hole battery provided by the utility model embodiment two;

[0027] Figure 7 It is the structural schematic diagram of the multi-liquid injection hole battery provided by the utility model embodiment three.

[0028] In the drawing:

[0029] 1, battery shell;11, shell end face;12, shell side;

[0030] 2, pole;

[0031] 3, liquid injection hole;31, first hole section;32, second hole section;

[0032] 4, explosion-proof valve assembly. DETAILED DESCRIPTION

[0033] ​​The utility model will be made further detailed description in combination with the drawings and examples. It can be understood that the specific examples described here are only used to explain the utility model, and not limited to the utility model. In addition, it should be noted that, in order to facilitate the description, only the part related to the utility model is shown in the drawings, not all structures.

[0034] In the description of the utility model, unless otherwise explicitly specified and limited, the terms 'connected', 'connected', 'fixed' should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0035] In the utility model, unless otherwise explicitly specified and limited, the first feature is 'on' or 'below' the second feature, which can include direct contact between the first and second features, or indirect contact between the first and second features through another feature between them. Moreover, the first feature 'on', 'above' and 'above' the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature 'below', 'below' and 'below' the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0036] In the description of the embodiment, the terms 'up', 'down', 'right', 'left' and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, therefore, it cannot be understood as a limitation of the utility model. In addition, the terms 'first','second' are only used to distinguish in description, and have no special meaning.

[0037] The multi-injection hole battery provided by the utility model will be introduced below in combination with the drawings and multiple examples.

[0038] Example one

[0039] In combination Figures 1 to 4As shown, the multi-injection hole battery provided by the embodiment is a square battery, and comprises a battery shell 1, a battery cell, a pole 2, and a plurality of injection holes 3. The battery shell 1 comprises a shell end face 11 and four shell side faces 12 connected to the shell end face 11, and the shell end face 11 and the four shell side faces 12 are connected to form a containing cavity in the battery shell 1; the battery cell is arranged in the containing cavity; the pole 2 is arranged on the battery shell 1 and is in conductive connection with the tab group on the battery cell; of the plurality of injection holes 3, at least one injection hole 3 is arranged on the pole 2, and at least two injection holes 3 are arranged on the shell end face 11.

[0040] It should be noted that in the drawings of the present application, a bidirectional arrow marked X represents a first direction, a bidirectional arrow marked Y represents a second direction, and a bidirectional arrow marked Z represents a third direction. The X axis is set to correspond to the length direction of the battery shell 1, and the shell end face 11 refers to the end face along the length direction of the battery shell 1. The Y axis is set to correspond to the width direction of the battery shell 1; for a square battery cell, the normal direction parallel to the side with a larger area is the width direction of the battery shell 1, and for a cylindrical battery cell, the radial line direction perpendicular to the vertical direction is the width direction of the battery shell 1. Therefore, the type of the multi-injection hole battery is not limited in the present application. The Z axis is set to correspond to the height direction of the battery shell 1 and is parallel to the vertical direction. In the embodiment, the X axis, the Y axis, and the Z axis are perpendicular to each other.

[0041] By arranging the injection holes 3 on the pole 2 and the battery shell 1, compared with the mode of arranging two injection holes 3 only on the battery shell 1, the number of injection holes 3 is larger, so that the injection nozzle can inject electrolyte into the battery shell 1 from the injection holes 3 arranged on the battery shell 1 and the pole 2 at the same time, thereby improving the injection efficiency and the pre-charging negative pressure exhaust efficiency, and further improving the work efficiency and reducing the time and labor costs. In addition, by increasing the injection holes 3 on the pole 2, it can be ensured that the electrolyte can be more uniformly distributed in each part of the battery shell 1 during injection, reducing the injection dead angle, and the user can choose to check the inside of the battery shell 1 from the injection holes 3 on the pole 2 or from the injection holes 3 on the battery shell 1, improving the checking flexibility of the user, thereby reducing the operation difficulty and facilitating timely problem discovery.

[0042] Further, in the embodiment, the battery shell 1 comprises two shell end faces 11, and the four shell side faces 12 are connected between the two shell end faces 11, thereby forming a battery shell 1 with a square structure suitable for the multi-injection hole battery.

[0043] It should be noted that in the embodiment, one liquid injection hole 3 is arranged on each of the two shell end faces 11, so that the two liquid injection holes 3 are located on two different end faces at two ends of the battery shell 1 along the X-axis direction, so that the distance between the two liquid injection holes 3 is the farthest, and the moisture or gas in the battery shell 1 can be discharged from the two liquid injection holes 3 at the two ends, thereby helping to shorten the exhaust distance and ensure the uniformity of the exhaust. In addition, electrolyte can also be injected into the interior from both ends of the battery shell 1, which helps to improve the liquid injection efficiency of the multi-liquid injection hole battery with a longer length.

[0044] Preferably, referring to Figure 2 As shown in the figure, the shortest distance from the edge of the shell end face 11 to the center of the liquid injection hole 3 located on the shell end face 11 is d1, and d1 satisfies: 5mm≤d1≤13mm. Exemplarily, d1 is 5mm, 7mm, 9mm, 11mm or 13mm. By setting d1 in the above range, not only can the situation that the liquid injection hole 3 is too close to the edge of the shell end face 11 to cause the shell end face 11 to collapse be avoided, but also the situation that the electrolyte is injected and is subjected to a large interference effect of the battery cell when the liquid injection hole 3 is too far away, thereby reducing the liquid injection efficiency, can be prevented. Thus, on the basis of enhancing the structural strength and sealing performance of the battery shell 1, the liquid injection effect is optimized.

[0045] Optionally, in the embodiment, the inner diameter of the liquid injection hole 3 gradually increases in the direction from the inner side wall of the battery shell 1 to the outer side wall of the battery shell 1, so that the amount of electrolyte injection can be increased, and the liquid injection efficiency is further improved. In addition, for the pre-charge negative pressure exhaust process, by setting the liquid injection hole 3 with a gradually changing cross-sectional area, the gas can pass through an exhaust passage with gradually increasing area when being discharged, so that the resistance of the gas when being discharged can be reduced, thereby helping to improve the exhaust efficiency.

[0046] Specifically, in the embodiment, referring to Figure 4 As shown in the figure, the liquid injection hole 3 includes a first hole section 31 and a second hole section 32, wherein the diameter of the first hole section 31 is greater than that of the second hole section 32, the first hole section 31 is closer to the outer side wall of the battery shell 1 than the second hole section 32, and the inner diameter of the second hole section 32 gradually increases in the direction from the inner side wall of the battery shell 1 to the outer side wall of the battery shell 1. In the above setting, by setting the liquid injection hole 3 to include the first hole section 31 and the second hole section 32, and the diameter of the first hole section 31 being greater than that of the second hole section 32, a liquid injection hole 3 with a stepped cross-section can be obtained. In this way, during liquid injection, the liquid injection nozzle can directly abut on the step face formed between the first hole section 31 and the second hole section 32, so that the electrolyte can be prevented from dripping on the side of the liquid injection hole 3 or the surface of the battery shell 1, the erosion of the electrolyte to the battery shell 1 is avoided, and the safety during liquid injection is improved.

[0047] Preferably, in the present embodiment, the included angle between the inner side wall of the second hole section 32 and the axis of the liquid injection hole 3 is α, and α satisfies: 5°≤α≤35°. Exemplarily, the included angle between the inner side wall of the second hole section 32 and the axis of the liquid injection hole 3 can be 5°, 10°, 15°, 20°, 25°, 30° or 35°.

[0048] In the present embodiment, two pole columns 2 are provided, one pole column 2 as a positive pole column for electrically connecting with the positive electrode lug group on the battery cell, and the other pole column 2 as a negative pole column for electrically connecting with the negative electrode lug group on the battery cell, and at least one pole column 2 is provided with a liquid injection hole 3 penetrating through. The two pole columns 2 are respectively installed on the two housing end faces 11, so that the multi-liquid injection hole battery forms a battery structure with the two side pole columns 2. Through the above layout, not only can the risk of short circuit caused by the contact of the two pole columns 2 be reduced, but also the height space of the multi-liquid injection hole battery can be saved, so that the multi-liquid injection hole battery can be more compactly integrated in the electrical equipment, and thus is more suitable for application scenarios with limited height space. In addition, the housing end face 11 is a battery cover plate, which can be connected with the side face by welding, detachable connection or the like to form the battery shell 1, and the liquid injection hole 3 described above is provided on the battery cover plate.

[0049] Further, the two pole columns 2 are both provided with a liquid injection hole 3, so that not only electrolyte can be injected from the liquid injection hole 3 provided on the battery cover plate, but also electrolyte can be injected from the liquid injection hole 3 provided on the pole column 2, so that the number of liquid injection holes 3 of the multi-liquid injection hole battery can be further increased, thereby further improving the liquid injection efficiency, and also enabling water or gas in the battery to be sprayed out from the pole column 2 and the battery cover plate at the same time, thereby further improving the exhaust efficiency.

[0050] In the present embodiment, as shown in Figure 1 The multi-liquid injection hole battery further comprises an explosion-proof valve assembly 4 provided on the battery shell 1. The explosion-proof valve assembly 4 can be opened when the internal gas pressure of the multi-liquid injection hole battery is large due to heat runaway or the like, so as to protect the safety of the multi-liquid injection hole battery and prevent the multi-liquid injection hole battery from exploding due to excessive internal gas pressure. In one embodiment of the present embodiment, the explosion-proof valve assembly 4 is provided on the housing side face 12. Of course, it can be understood that, as an alternative embodiment, the explosion-proof valve assembly 4 can also be provided on the same housing end face 11 as the pole column 2, and the number of explosion-proof valve assemblies 4 can be one or multiple, which is not limited by the present application.

[0051] Embodiment two

[0052] As Figure 5As shown, the multi-injection hole battery of Example Two is different from Example One in the number and position of the injection holes 3. In the multi-injection hole battery of Example Two, at least two injection holes 3 are arranged on the same shell side surface 12 in addition to the injection hole 3 arranged on the shell end surface 11. In one embodiment of the present embodiment, of the two oppositely arranged shell side surfaces 12, the upper shell side surface 12 is provided with one injection hole 3 at each end, and the two injection holes 3 are provided with the above-mentioned explosion-proof valve assembly 4.

[0053] By arranging the injection hole 3 on the same shell side surface 12, not only is the production and manufacturing convenient and fast, but the injection position on the battery shell 1 is further increased, so that the injection efficiency of the battery shell 1 is further increased, ensuring that the multi-injection hole battery with a large length dimension can complete the injection or exhaust process in a shorter time. Moreover, arranging the injection hole 3 on the shell side surface 12 can also adaptively increase the wall thickness of the shell side surface 12, thereby improving the quality of the battery shell 1, preventing the battery shell 1 from deforming, and effectively enhancing the production quality of the multi-injection hole battery.

[0054] Preferably, in the present embodiment, the shortest distance d2 from the edge of the shell side surface 12 to the center of the injection hole 3 on the shell side surface 12 is set to satisfy 5mm≤d2≤75mm. Figure 6 As shown, the shortest distance d2 from the edge of the shell side surface 12 to the center of the injection hole 3 on the shell side surface 12 is set to satisfy 5mm≤d2≤75mm. Exemplarily, d2 can be 5mm, 15mm, 25mm, 35mm, 45mm, 55mm, 65mm or 75mm. d2 can be adaptively increased with the increase of the length of the shell side surface 12, so that the positions of the two injection holes 3 on the shell side surface 12 can not only be kept within a relatively far distance range to avoid the influence of the close distance on the injection or exhaust effect of the two injection holes 3, but also avoid the influence of the close distance from the edge of the shell side surface 12 on the structural strength of the shell side surface 12, ensuring that the flatness of the shell side surface 12 meets the requirements.

[0055] Of course, in other alternative embodiments, at least two injection holes 3 can be arranged on the shell side surface 12, and no injection hole 3 is arranged on the shell end surface 11, which can also ensure that the number and position of the injection holes 3 of the multi-injection hole battery meet the injection or exhaust efficiency requirements, while to some extent, the opening pressure of the battery shell 1 can be reduced to meet the structural design requirements of the battery shell 1 in actual situations.

[0056] It can be understood that more than two injection holes 3 can be arranged on the shell side surface 12, so that when the length of the battery shell 1 is longer, the injection or exhaust efficiency can be ensured by increasing the number of injection holes 3.

[0057] It should be noted that in other alternative embodiments, among the two shell side surfaces 12 arranged opposite to each other along the Y-axis direction, at least two injection holes 3 may be provided only on the shell side surface 12 located in the front or rear, so that the electrolyte can be injected into the battery shell 1 from the front or rear of the battery shell 1.

[0058] In other alternative embodiments, at least two injection holes 3 may be provided only on the lower side surface 12 of the shell, so that the electrolyte can be injected into the battery shell 1 from the bottom of the battery shell 1. In this way, gravity can be used to accelerate the flow of the electrolyte in the battery shell 1, which is conducive to quickly and evenly filling the battery shell 1 with the electrolyte, and also helps to reduce the generation and accumulation of bubbles during injection, thereby improving the injection efficiency.

[0059] Example 3

[0060] like Figure 7 As shown, the multi-injection hole battery of Example 3 differs from Example 2 in that the injection holes 3 are located in different positions. In the multi-injection hole battery of Example 3, injection holes 3 are provided not only on the end surface 11 of the shell, but also on different shell side surfaces 12. One implementation of this embodiment is that of the two shell side surfaces 12 arranged opposite each other along the Z-axis, the upper shell side surface 12 is provided with an injection hole 3; and of the two shell side surfaces 12 arranged opposite each other along the Y-axis, the front shell side surface 12 is provided with an injection hole 3, so that the two injection holes 3 are provided on different shell side surfaces 12.

[0061] Through the above arrangement, in the multi-injection hole battery, injection holes 3 are provided on the shell side surface 12 and the shell end surface 11 of the battery shell 1 located in three different directions, so that the battery shell 1 can cooperate with the three-axis (X-axis, Y-axis and Z-axis) injection nozzles to inject electrolyte from multiple directions, avoiding mutual interference between the injection nozzles during injection, ensuring a high injection efficiency, and also ensuring that the battery cells in the battery shell 1 are fully supplied with electrolyte.

[0062] Of course, it is understandable that in other alternative implementations of this embodiment, the injection holes 3 can be set only on different shell side faces 12, while the injection holes 3 on the shell end face 11 can be omitted, so as to reasonably control the number of injection holes 3 and ensure that the structural strength of the battery shell 1 at the end meets actual needs.

[0063] It should be noted that the number of the liquid injection holes 3 on one shell side surface 12 can be one or multiple, for example, among the two shell side surfaces 12 oppositely arranged along the Z-axis direction, the upper shell side surface 12 can be provided with one liquid injection hole 3, or two or more liquid injection holes 3; among the two shell side surfaces 12 oppositely arranged along the Y-axis direction, the front shell side surface 12 can be provided with one liquid injection hole 3, or two or more liquid injection holes 3. Therefore, the number of the liquid injection holes 3 can be selected according to the actual working condition by those skilled in the art, and the utility model is not limited thereto.

[0064] It should be noted that in other alternative embodiments, one liquid injection hole 3 can also be arranged on the upper shell side surface 12 and the lower shell side surface 12 respectively, or one liquid injection hole 3 can also be arranged on the upper shell side surface 12 and the rear shell side surface 12 respectively, or one liquid injection hole 3 can also be arranged on the lower shell side surface 12 and the rear shell side surface 12 respectively, or one liquid injection hole 3 can also be arranged on the front shell side surface 12 and the rear shell side surface 12 respectively. In this way, the electrolyte can be injected into the battery shell 1 from different directions, and the purpose of improving the liquid injection efficiency can be achieved.

[0065] In the description of the present specification, the description referring to the terms "some embodiments", "other embodiments", and the like means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the utility model. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0066] Obviously, the above embodiments of the utility model are only for clear illustration of the utility model, and are not limited to the embodiments of the utility model. For those skilled in the art, various obvious changes, re-adjustments and replacements can be made without departing from the protection scope of the utility model. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A multiwell cell, characterized by, The application relates to a battery shell (1) comprising a shell end face (11) and a shell side face (12) connected to the shell end face (11); a pole column (2) arranged on the battery shell (1); a plurality of liquid injection holes (3), at least one of which is arranged on the pole column (2), and at least two of which are arranged on the shell end face (11) and / or the shell side face (12). The battery shell (1) comprises two shell end faces (11) connected by the shell side face (12), and one liquid injection hole (3) is arranged on each of the two shell end faces (11); the shortest distance from the edge of the shell end face (11) to the center of the liquid injection hole (3) on the shell end face (11) is d1, and 5mm<=d1<=13mm. The multi-liquid injection hole battery comprises two pole columns (2), one pole column (2) is arranged on each of the two shell end faces (11), and the liquid injection hole (3) is arranged through at least one of the pole columns (2). The multi-liquid injection hole battery comprises two pole columns (2), one pole column (2) is arranged on each of the two shell end faces (11), and the liquid injection hole (3) is arranged through at least one of the pole columns (2).

2. The multi-pour cell of claim 1, wherein, The multi-liquid injection hole battery comprises two pole columns (2), one pole column (2) is arranged on each of the two shell end faces (11), and the liquid injection hole (3) is arranged through at least one of the pole columns (2).

3. The multi-pour cell of claim 2, wherein, The multi-liquid injection hole battery comprises two pole columns (2), one pole column (2) is arranged on each of the two shell end faces (11), and the liquid injection hole (3) is arranged through at least one of the pole columns (2).

4. The multi-pour cell of claim 2, wherein, The shell side face (12) is provided with at least two liquid injection holes (3) at the same time, and the shortest distance from the edge of the shell side face (12) to the center of the liquid injection hole (3) on the shell side face (12) is d2, and 5mm<=d2<=75mm.

5. The multi-pour cell of claim 3 or 4, wherein, The battery shell (1) comprises two shell side faces (12), 6. The multi-puncture cell of claim 1, wherein, Among the at least two liquid injection holes (3), one or part of the liquid injection holes (3) are arranged on one shell side face (12), and the remaining liquid injection holes (3) are arranged on the other shell side face (12).

7. The multi-pour cell of claim 6, wherein, Alternatively, all the at least two liquid injection holes (3) are arranged on one shell side face (12). The inner diameter of the liquid injection hole (3) gradually increases in the direction from the inner side wall of the battery shell (1) to the outer side wall of the battery shell (1). The liquid injection hole (3) comprises a first hole section (31) and a second hole section (32), the diameter of the first hole section (31) is greater than that of the second hole section (32), the first hole section (31) is closer to the outer side wall of the battery shell (1) than the second hole section (32), and the inner diameter of the second hole section (32) gradually increases in the direction from the inner side wall of the battery shell (1) to the outer side wall of the battery shell (1).

8. The multi-puncture cell of claim 1, wherein, The included angle between the inner side wall of the liquid injection hole (3) and the axis of the liquid injection hole (3) is alpha, and 5<=alpha<=35.

9. The multi-pour cell of claim 8, wherein, ​ 10. The multi-puncture cell of claim 9, wherein, ​

Images