Battery shell and battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery shell and a battery, the battery shell comprises a cover plate body, a shell body and an insulating part, a liquid injection hole is formed in the wall surface of the cover plate body or the shell body opposite to one side, extending out of a tab, of a pole group, a buffer sinking table opposite to the liquid injection hole is arranged on the insulating part, and the liquid injection hole is communicated with the buffer sinking table. A first wall surface perpendicular to the first direction and a second wall surface parallel to the first direction and annularly arranged on the outer side of the first wall surface are arranged on the buffer sinking table, a plurality of liquid outlet holes communicated with the liquid injection hole are formed in the second wall surface, the surface area of the second wall surface is S1, the total flow area of the plurality of liquid outlet holes is S2, and S2 / S1 is larger than or equal to 0.3 and smaller than or equal to 0.55. The plurality of liquid outlet holes are formed in the second wall surface, so that the electrolyte flows out of the liquid injection hole, falls on the closed first wall surface and cannot flow out of the liquid outlet holes in the second wall surface at the first time, and the buffer effect is achieved while the flow velocity is relatively high.

Description

Battery casing and battery Technical Field

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

[0002] Lithium-ion batteries are widely used in various fields such as transportation power supply, power storage, new energy storage power supply, aerospace and military industries due to their advantages such as large capacity, high operating voltage, strong charge retention capacity, and long cycle life. A typical lithium-ion battery structure includes electrode assembly, electrolyte, cover plate, casing, and internal and external insulation structures. The cover plate and casing are usually fixed by laser welding, forming a sealed space with a certain structural strength to protect the electrode assembly. The cover plate generally integrates functional areas such as electrode posts, explosion-proof valves, and electrolyte injection holes. The electrolyte injection hole is usually located on the cover plate, and a through hole communicating with the injection hole is opened in the internal insulation structure to facilitate the inflow of electrolyte and achieve the purpose of wetting the electrode assembly.

[0003] To facilitate rapid electrolyte inflow, the injection hole on the cover plate is typically concentrically positioned with the through-hole on the inner insulation structure. This allows the electrolyte flowing from the injection hole to directly enter the through-hole directly below. However, during electrolyte injection, in addition to its own downward gravity, there is also the injection pressure provided by the external injection equipment. Given the relatively low strength of the electrode assembly's electrode sheet structure, the electrode assembly is subjected to significant impact forces due to its own gravity and the injection pressure carried by the electrolyte as it is injected through the through-hole. This makes the electrode sheets of the electrode assembly susceptible to damage from the electrolyte impact, such as powder shedding, which seriously affects product quality and reduces production yield. Summary of the Invention

[0004] The purpose of this utility model is to provide a battery casing and battery that alleviates damage to the electrode assembly during electrolyte injection, improves the protection of the electrode assembly during electrolyte injection, reduces the probability of adverse phenomena, improves product quality, and has a high production yield.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] On one hand, a battery casing is provided, the battery casing including a cover plate body, a casing body and an insulating member, the casing body is a hollow shell structure with an opening, the cover plate body is disposed at the opening of the casing body to form a receiving cavity for accommodating the electrode assembly, and an injection hole is opened on the wall surface of the cover plate body or the casing body opposite to the side of the electrode assembly that extends out of the tab; the insulating member is located in the receiving cavity and is disposed on the side of the electrode assembly that extends out of the tab.

[0007] The surface of the insulating member facing away from the electrode group is recessed inward toward the electrode group to form a buffer recess opposite to the injection hole. The buffer recess is provided with a first wall perpendicular to the first direction and a second wall parallel to the first direction and arranged around the outside of the first wall. The second wall is also provided with a plurality of liquid outlet holes communicating with the injection hole, and the plurality of liquid outlet holes penetrate the second wall.

[0008] The surface area of ​​the second wall is S1, and the total flow area of ​​the plurality of liquid outlet holes is S2, and satisfies 0.3≤S2 / S1≤0.55.

[0009] Optionally, the distances from the liquid outlet holes on the second wall to the central axis of the liquid injection hole are all equal.

[0010] Optionally, the cross-section of the buffer platform is circular, elliptical, or polygonal, and the cross-section is parallel to the first wall surface.

[0011] Optionally, the point closest to the liquid outlet on the first wall surface is spaced apart from the first wall surface.

[0012] Optionally, the insulating member has a weight-reducing groove on the side facing the electrode assembly, and a portion of the buffer platform is located inside the weight-reducing groove, while another portion is located outside the weight-reducing groove.

[0013] Optionally, the weight-reducing groove is provided with a reinforcing rib structure.

[0014] Optionally, the wall surface of the cover plate body or the outer shell body with the injection hole is provided with a plug-in boss on the side facing the insulating member. The plug-in boss extends in the direction close to the insulating member and is inserted into the buffer recess. The injection hole passes through the plug-in boss.

[0015] Optionally, the projected area of ​​the plug-in boss on the insulating member along the first direction is S3, and the projected area of ​​the buffer recess on the wall of the cover plate body or the outer shell body along the first direction is S4, and S4 / S3≥4.5.

[0016] Optionally, the insulating component is a plastic structural component.

[0017] On the other hand, a battery is provided, the battery including an electrode assembly and a battery housing as described in any of the preceding claims, the electrode assembly being housed within the battery housing.

[0018] The beneficial effects of this utility model are:

[0019] This utility model provides a battery casing. The casing features a buffer platform formed by recessing the surface of the insulating component away from the electrode assembly towards the electrode assembly, opposite to the electrolyte injection hole. Multiple outlet holes communicating with the injection hole are formed on the second wall of the buffer platform. This prevents the electrolyte from immediately flowing out through the outlet holes after being injected through the injection hole; instead, it is temporarily stored in the buffer platform and allowed to stand for a period of time until the liquid level reaches the height of the outlet holes. This effectively mitigates the electrolyte leakage caused by the buffer platform. The impact force generated by the electrolyte's own weight and the injection pressure when it is injected from the injection hole allows the electrolyte to flow out through the outlet hole at a gentler flow rate and wet the electrode assembly, thus preventing damage to the electrode assembly due to the impact of the electrolyte and improving the protection of the electrode assembly during injection. On the other hand, by limiting the total flow area S2 of multiple outlet holes and the surface area S1 of the second wall, both are made to satisfy 0.3≤S2 / S1≤0.55, thereby ensuring that the electrolyte has a high flow rate when flowing out through the outlet hole.

[0020] This utility model also provides a battery that, by applying the aforementioned battery casing, provides high protection for the electrode assembly during liquid injection, thereby reducing the probability of malfunctions, improving product quality, and achieving a high production yield. Attached Figure Description

[0021] Figure 1 is a schematic diagram of the disassembled structure of the cover plate body and the insulating component in the battery casing provided by this utility model;

[0022] Figure 2 is a schematic diagram of the structure of the insulating component in the battery casing provided by this utility model;

[0023] Figure 3 is an enlarged view of the structure of part A in Figure 2;

[0024] Figure 4 is a partial structural disassembly diagram of the battery provided by this utility model.

[0025] In the picture:

[0026] 100, Electrode Group; 200, Electrode Sheet;

[0027] 1. Cover plate body; 11. Injection hole; 12. Insertion boss;

[0028] 2. Insulating component; 21. Buffer recess; 211. First wall surface; 212. Second wall surface; 22. Liquid outlet; 23. Weight reduction groove; 24. Reinforcing rib structure;

[0029] 3. Outer shell. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0031] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0034] Because the injection holes on the cover plate are concentrically set with the through holes on the inner insulation structure, the electrolyte is subjected to both its own downward gravity and the injection pressure provided by the external injection equipment during injection. This results in a significant impact on the electrode assembly during electrolyte injection, making the electrode sheets of the electrode assembly prone to damage due to the impact of the electrolyte. For example, defects such as powder shedding may occur, which seriously affects product quality and reduces production yield.

[0035] Therefore, in order to avoid damage to the electrode assembly during electrolyte injection, resulting in defects such as powder shedding, and to improve product quality and increase production yield, this embodiment provides a battery casing.

[0036] As shown in Figures 1 to 4, the battery casing includes a cover plate body 1, a casing body 3, and an insulating member 2. The casing body 3 is a hollow shell structure with an opening. The cover plate body 1 is located at the opening of the casing body 3 to form a receiving cavity for accommodating the electrode assembly 100. An injection hole 11 is provided on the wall surface of the cover plate body 1 or the casing body 3 opposite to the side of the electrode assembly 100 that extends out of the tab 200. The insulating member 2 is located in the receiving cavity and is located on the side of the electrode assembly 100 that extends out of the tab 200. The surface of the insulating member 2 facing away from the electrode assembly 100 is recessed inward toward the direction close to the electrode assembly 100 to form a buffer platform 21 that is opposite to the injection hole 11. The buffer platform 21 is provided with a first wall surface 211 that is perpendicular to the first direction and a second wall surface 212 that is parallel to the first direction and surrounds the outside of the first wall surface 211. The second wall surface 212 is also provided with a plurality of liquid outlet holes 22 that communicate with the injection hole 11. The plurality of liquid outlet holes 22 all penetrate the second wall surface 212.

[0037] The surface area of ​​the second wall 212 is S1, and the total flow area of ​​the multiple liquid outlet holes 22 is S2, satisfying 0.3≤S2 / S1≤0.55.

[0038] The battery casing forms a buffer platform 21 opposite to the injection hole 11 by recessing the surface of the insulating component 2 toward the cover plate body 1 in a direction away from the cover plate body 1. Multiple outlet holes 22 communicating with the injection hole 11 are formed on the second wall 212 of the buffer platform 21. This prevents the electrolyte from flowing out through the outlet holes 22 immediately after being injected from the injection hole 11. The electrolyte needs to be temporarily stored in the buffer platform 21 and allowed to stand for a period of time until the liquid level reaches the height of the outlet holes before it can flow out. Thus, the buffer platform 21 effectively alleviates the problem of electrolyte overflow. When electrolyte is injected through the injection hole 11, the impact force generated by its own weight and the injection pressure causes the electrolyte to flow out through the outlet hole 22 at a gentler flow rate and wet the electrode assembly 100. This prevents damage to the electrode assembly 100 due to the impact of the electrolyte and improves the protection of the electrode assembly 100 during electrolyte injection. On the other hand, by limiting the total flow area S2 of the multiple outlet holes 22 and the surface area S1 of the second wall 212, both are made to satisfy 0.3≤S2 / S1≤0.55, thereby ensuring that the electrolyte has a high flow rate when flowing out through the outlet hole 22.

[0039] The injection hole 11 can be located in different positions according to the structural design. When the side of the electrode assembly 100 extending from the tab 200 is opposite to the cover plate body 1, the injection hole 11 is located on the cover plate body 1. When the side of the electrode assembly 100 extending from the tab 200 is opposite to a wall surface of the outer casing body 3, the injection hole 11 is located on the wall surface of the outer casing body 3 opposite to the tab 200. In this embodiment, the injection hole 11 is located on the cover plate body 1. Furthermore, this battery casing can be applied to different battery types, such as blade batteries, prismatic batteries, or large cylindrical batteries. In this embodiment, the battery casing is applied to a blade battery. It should be noted that the buffer recess 21 is formed by the indentation of the surface of the insulating member 2 away from the pole group 100 towards the pole group 100. Therefore, when viewed from the surface of the insulating member 2 facing the pole group 100, the buffer recess 21 protrudes from the surface of the insulating member 2 facing the pole group 100 in the direction close to the pole group 100. The shape of the structure protruding from the surface of the insulating member 2 facing the pole group 100 can be freely set according to requirements, and can be a rectangular protrusion, a circular protrusion, or a diamond protrusion, etc.

[0040] To verify the effect of the ratio of the total flow area S2 of the multiple liquid outlet holes 22 to the surface area S1 of the second wall surface 212 on the electrolyte wetting rate of the electrode assembly 100, as shown in Table 1, five sets of examples and four sets of comparative examples are provided to verify the two.

[0041] Table 1

[0042]

[0043] In Example 1, the value of the relationship S2 / S1 was set to 0.30. Experimental verification showed that the electrolyte wetting time of the electrode assembly 100 met the process requirements.

[0044] In Example 2, the value of the relationship S2 / S1 was set to 0.35. Experimental verification showed that the electrolyte wetting time of the electrode assembly 100 met the process requirements.

[0045] In Example 3, the value of the relationship S2 / S1 was set to 0.40. Experimental verification showed that the electrolyte wetting time of the electrode assembly 100 met the process requirements.

[0046] In Example 4, the value of the relationship S2 / S1 was set to 0.50. Experimental verification showed that the electrolyte wetting time of the electrode assembly 100 met the process requirements.

[0047] In Example 5, the value of the relationship S2 / S1 was set to 0.55. Experiments verified that the electrolyte wetting time of the electrode assembly 100 met the process requirements.

[0048] As can be seen from Examples 1 to 5, when the relationship S2 / S1 is within the range of 0.3≤S2 / S1≤0.55, the electrolyte wetting time of the electrode assembly 100 meets the process requirements, the wetting speed is fast, and the wetting requirements of the electrode assembly 100 are met.

[0049] In Comparative Example 1, the value of the relationship S2 / S1 was set to 0.20. Experimental verification showed that the electrolyte wetting time of electrode assembly 100 exceeded the process requirement range by about 5.5%.

[0050] In Comparative Example 2, the value of the relationship S2 / S1 was set to 0.25. Experimental results showed that the electrolyte wetting time of electrode assembly 100 exceeded the process requirement range by approximately 3.8%.

[0051] As can be seen from Comparative Examples 1 and 2, when the relationship S2 / S1 is less than the minimum value of the range 0.3≤S2 / S1≤0.55, the time for the electrolyte to wet the electrode assembly 100 exceeds the process requirement range, and the wetting speed is slow.

[0052] In Comparative Example 3, the value of the relationship S2 / S1 was set to 0.60. Experimental verification showed that the electrolyte wetting time of the electrode assembly 100 met the process requirements, but the deformation of the buffer settling platform 21 was too large after being squeezed by the electrode assembly 100.

[0053] In Comparative Example 4, the value of the relationship S2 / S1 was set to 0.65. Experimental verification showed that the electrolyte wetting time of the electrode assembly 100 met the process requirements, but the deformation of the buffer settling platform 21 was too large after being squeezed by the electrode assembly 100.

[0054] As can be seen from Comparative Examples 3 to 4, when the relationship S2 / S1 is greater than the maximum value of the range 0.3≤S2 / S1≤0.55, although the electrolyte wetting time of the electrode assembly 100 meets the process requirements, the deformation of the buffer settling platform 21 after being squeezed by the electrode assembly 100 is too large and the structural strength is poor.

[0055] Optionally, as shown in Figure 3, the distances from the multiple liquid outlet holes 22 on the second wall surface 212 to the central axis of the liquid injection hole 11 are all equal. By ensuring that the distances from the multiple liquid outlet holes 22 on the second wall surface 212 to the central axis of the liquid injection hole 11 are all equal, the flow rate of each liquid outlet hole 22 is guaranteed to be the same. The number and shape of the liquid outlet holes 22 can be freely set according to requirements. In this embodiment, four rectangular liquid outlet holes 22 are distributed on the second wall surface 212 of the buffer platform 21, and the four rectangular liquid outlet holes 22 are evenly distributed at a 90° included angle.

[0056] Specifically, the cross-section of the buffer platform 21 is circular, elliptical, or polygonal, and this cross-section is parallel to the first wall surface 211. In this embodiment, the cross-section of the buffer platform 21 parallel to the first wall surface 211 is circular. By setting the buffer platform 21 with a circular cross-section, it is convenient to uniformly distribute the multiple liquid outlet holes 22 opened on the second wall surface 212 on the buffer platform 21.

[0057] Optionally, as shown in Figure 3, the point closest to the first wall surface 211 in the outlet hole 22 is spaced apart from the first wall surface 211. By maintaining a certain distance between the point closest to the first wall surface 211 in the outlet hole 22 and the first wall surface 211, it is ensured that the electrolyte flowing into the buffer settling platform 21 from the injection hole 11 needs to accumulate to a certain height before it can flow out through the outlet hole 22. This effectively mitigates the impact force carried by the electrolyte when it is injected from the injection hole 11 and avoids damage to the electrode assembly 100 after the electrolyte flows out from the outlet hole 22.

[0058] Optionally, as shown in Figures 2 and 3, a weight-reducing groove 23 is provided on the side of the insulating component 2 facing the electrode assembly 100. A portion of the buffer recess 21 is located within the weight-reducing groove 23, and another portion is located outside the weight-reducing groove 23. By providing a weight-reducing groove 23 on the side of the insulating component 2 facing the electrode assembly 100, the weight of the insulating component 2 itself is reduced, achieving a lightweight design and reducing manufacturing costs. On the other hand, by placing a portion of the buffer recess 21 within the weight-reducing groove 23, an overlapping area exists between the buffer recess 21 and the insulating component 2. This ensures the height of the buffer recess 21 while reducing the portion of the buffer recess 21 protruding from the insulating component 2, effectively controlling the external dimensions of the insulating component 2 and preventing the insulating component 2 from becoming too large, which would affect assembly.

[0059] Optionally, as shown in Figures 2 and 3, a reinforcing rib structure 24 is provided within the weight-reducing groove 23. By providing the reinforcing rib structure 24 within the weight-reducing groove 23, the structural strength of the insulating component 2 is prevented from being too low after the weight-reducing groove 23 is formed. In this embodiment, the insulating component 2 is integrally molded using an injection molding process, so that the weight-reducing groove 23, the reinforcing rib structure 24, and the buffer recess 21 are formed simultaneously on the insulating component 2.

[0060] Optionally, as shown in Figure 1, the wall surface of the cover plate body 1 or the outer shell body 3, which has an injection hole 11, has a plug-in boss 12 on the side facing the insulating member 2. The plug-in boss 12 extends in the direction close to the insulating member 2 and is inserted into the buffer recess 21, with the injection hole 11 passing through the plug-in boss 12. By providing the plug-in boss 12 on the wall surface of the cover plate body 1 or the outer shell body 3 with the injection hole 11, it is convenient to guide the electrolyte from the injection hole 11 into the buffer recess 21, thus preventing the electrolyte from spreading.

[0061] Optionally, as shown in Figure 1, the projected area of ​​the insertion boss 12 on the insulating member 2 along the first direction is S3, and the projected area of ​​the buffer recess 21 on the wall surface of the cover plate body 1 or the outer shell body 3 along the first direction is S4, and S4 / S3≥4.5 is satisfied. By limiting the ratio of the projected area S3 of the insertion boss 12 on the insulating member 2 along the first direction to the projected area S4 of the buffer recess 21 on the wall surface of the cover plate body 1 or the outer shell body 3 along the first direction, so that S4 / S3≥4.5, there is a sufficient gap between the outer wall of the insertion boss 12 and the inner wall of the buffer recess 21, so that the electrolyte can flow out through the outlet hole 22 through the gap between the outer wall of the insertion boss 12 and the inner wall of the buffer recess 21.

[0062] To verify the influence of the ratio of the projected area S4 of the buffer recess 21 on the wall of the cover plate body 1 or the outer shell body 3 along the first direction to the projected area S3 of the plug-in boss 12 on the insulating member 2 along the first direction on the electrolyte wetting speed of the electrode assembly 100, as shown in Table 2, three sets of embodiments and two sets of comparative examples are provided to verify the two.

[0063] Table 2

[0064] S4 / S3 Verification Results: Example 6: 4.5 Electrolyte wetting electrode assembly time meets process requirements; Example 7: 5.5 Electrolyte wetting electrode assembly time meets process requirements; Example 8: 6.0 Electrolyte wetting electrode assembly time meets process requirements; Comparative Example 5: 3.5 Electrolyte wetting electrode assembly time exceeds process requirement range by approximately 4.3%; Comparative Example 6: 4.0 Electrolyte wetting electrode assembly time exceeds process requirement range by approximately 3.8%. surface

[0065] In Example 6, the value of the relationship S4 / S3 was set to 4.5. Experiments verified that the electrolyte wetting time of the electrode assembly 100 met the process requirements.

[0066] In Example 7, the value of the relationship S4 / S3 was set to 5.5. Experiments verified that the electrolyte wetting time of the electrode assembly 100 met the process requirements.

[0067] In Example 8, the value of the relationship S4 / S3 was set to 6.0. Experimental verification showed that the electrolyte wetting time of the electrode assembly 100 met the process requirements.

[0068] As can be seen from Examples 6 to 8, when the relationship S4 / S3 is within the range of S4 / S3≥4.5, there is a sufficient gap between the outer wall of the insertion boss 12 and the inner wall of the buffer counter 21, so that the electrolyte has a fast flow rate and ample flow space. Therefore, the electrolyte wetting time of the electrode assembly 100 meets the process requirements, the wetting speed is fast, and the wetting requirements of the electrode assembly 100 are met.

[0069] In Comparative Example 5, the value of the relationship S4 / S3 was set to 3.5. Experimental verification showed that the electrolyte wetting time of electrode assembly 100 exceeded the process requirement range by about 4.3%.

[0070] In Comparative Example 6, the value of the relationship S4 / S3 was set to 4.0. Experimental verification showed that the electrolyte wetting time of electrode assembly 100 exceeded the process requirement range by about 3.8%.

[0071] As can be seen from Comparative Examples 5 and 6, when the relationship S4 / S3 is less than the minimum value of the range S4 / S3≥4.5, the distance between the outer wall of the plug boss 12 and the inner wall of the buffer counter 21 is small, resulting in a slower flow rate of the electrolyte and a smaller flow space. Therefore, the time for the electrolyte to wet the electrode assembly 100 exceeds the process requirements, and the wetting speed is slow. Furthermore, as can be seen from Comparative Examples 5 and 6, as the ratio of S4 / S3 gradually increases, the time exceeding the process requirements gradually decreases.

[0072] Optionally, the insulating component 2 is a plastic structural component. By using a plastic structural component as the insulating component 2, insulation can be guaranteed while avoiding damage to the electrode assembly 100.

[0073] In this embodiment, a battery is also provided, comprising an electrode assembly 100 and the aforementioned battery casing, wherein the electrode assembly 100 is housed within the battery casing. By employing the aforementioned battery casing, this battery provides high protection for the electrode assembly 100 during electrolyte filling, thereby reducing the probability of defects, improving product quality, and achieving a high production yield.

[0074] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A battery casing, characterized in that, The battery casing includes a cover plate body, a casing body, and an insulating component. The casing body is a hollow shell structure with an opening. The cover plate body is located at the opening of the casing body to form a cavity for accommodating the electrode assembly. A liquid injection hole is formed on the wall surface of the cover plate body or the casing body opposite to the side of the electrode assembly extending from the tab. The insulating component is located in the cavity and is located on the side of the electrode assembly extending from the tab. The surface of the insulating component facing away from the electrode assembly is recessed inward toward the electrode assembly to form a buffer platform opposite to the liquid injection hole. The buffer platform has a first wall surface perpendicular to a first direction and a second wall surface parallel to the first direction and arranged around the outside of the first wall surface. The second wall surface also has multiple liquid outlet holes communicating with the liquid injection hole, and the multiple liquid outlet holes all penetrate the second wall surface. The surface area of ​​the second wall surface is S1, and the total flow area of ​​the multiple liquid outlet holes is S2, and satisfies 0.3≤S2 / S1≤0.

55.

2. The battery casing according to claim 1, characterized in that, The distances from the liquid outlet holes on the second wall to the central axis of the liquid injection hole are all equal.

3. The battery casing according to claim 1, characterized in that, The cross-section of the buffer platform is circular, elliptical, or polygonal, and this cross-section is parallel to the first wall surface.

4. The battery casing according to claim 1, characterized in that, The point of the liquid outlet closest to the first wall surface is spaced apart from the first wall surface.

5. The battery casing according to claim 1, characterized in that, The insulating component has a weight-reducing groove on the side facing the electrode assembly, and a portion of the buffer platform is located inside the weight-reducing groove, while the other portion is located outside the weight-reducing groove.

6. The battery casing according to claim 5, characterized in that, The weight-reducing groove is equipped with a reinforcing rib structure.

7. The battery casing according to claim 1, characterized in that, The wall surface of the cover plate body or the outer shell body with the injection hole has a plug-in boss on the side facing the insulating member. The plug-in boss extends in the direction close to the insulating member and is inserted into the buffer recess. The injection hole passes through the plug-in boss.

8. The battery casing according to claim 7, characterized in that, The projection area of ​​the plug-in boss on the insulating component along the first direction is S3, and the projection area of ​​the buffer recess on the wall surface of the cover plate body or the outer shell body along the first direction is S4, and S4 / S3≥4.

5.

9. The battery casing according to claim 1, characterized in that, The insulating component is a plastic structural component.

10. A battery, characterized in that, The battery includes an electrode assembly and a battery housing as described in any one of claims 1-9, wherein the electrode assembly is housed within the battery housing.

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