Battery shell and battery
By designing through holes and blocking areas in the insulating structure of the lithium-ion battery casing, the impact force during electrolyte injection is mitigated, the problem of electrode damage is solved, and product quality and yield are improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SVOLT ENERGY TECHNOLOGY CO LTD
- Filing Date
- 2025-04-29
- Publication Date
- 2026-04-21
AI Technical Summary
During the electrolyte filling process, the impact force of the electrolyte can damage the electrode assembly, affecting product quality and yield.
Design a battery casing that uses through holes on insulating structural components to form a closed area, allowing the electrolyte to first fall onto the closed area and then flow into the through holes, thus mitigating the impact force of electrolyte injection.
This reduces damage to the electrode assembly, improves product quality and yield, and lowers manufacturing costs.
Smart Images
Figure CN224153455U_ABST
Abstract
Description
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. Utility Model Content
[0004] The purpose of this utility model is to provide a battery casing and battery that reduces the impact force during electrolyte injection, reduces damage to the electrode assembly during injection, improves product quality, and increases product 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 structural 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 structural 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 insulating structure includes a clearance through hole for avoiding the electrode tab and abutment portions on both sides of the clearance through hole along a first direction. The abutment portions abut against the electrode assembly. Multiple through holes are formed on the abutment portions located on the same side as the liquid injection hole. The multiple through holes are used to allow electrolyte to pass through the insulating structure during liquid injection. The multiple through holes form a closed area on the abutment portions opposite to the liquid injection hole.
[0008] Optionally, the flow area of the injection hole is S1, the area of the occlusion zone is S2, and the condition 2.25≤S2 / S1≤4 is satisfied.
[0009] Optionally, among the multiple projections of the multiple through holes on the wall surface of the cover plate body or the outer shell body along the second direction, the distance between the projection of the through hole closest to the injection hole and the edge of the injection hole is A, and satisfies 5mm≤A≤8mm.
[0010] Optionally, the total flow area of the plurality of through holes is S3, and the bottom area of the abutment portion having the plurality of through holes is S4, and satisfies 0.4≤S3 / S4≤0.65.
[0011] Optionally, the wall surface of the cover plate body or the outer shell body with the injection hole is provided with a drainage protrusion on the side facing the insulating structure, the drainage protrusion extends in the direction close to the occlusion area, and the injection hole passes through the drainage protrusion.
[0012] Optionally, the insulating structural member has a connecting groove on the side away from the electrode group, the clearance through hole penetrates the bottom of the connecting groove, and the insulating structural member forms the abutment part on both sides of the clearance through hole along the first direction. The wall surface of the cover plate body or the outer shell body with the liquid injection hole has an insertion boss on the side facing the insulating structural member, and the insertion boss is inserted into the connecting groove.
[0013] Optionally, the insulating structure further includes a first reinforcing plate, and each of the abutting portions has a plurality of first reinforcing plates on the side opposite to the electrode assembly.
[0014] Optionally, the insulating structure further includes a second reinforcing plate, and each of the first reinforcing plates may be optionally connected to the second reinforcing plate, wherein the first reinforcing plate and the second reinforcing plate are perpendicular to each other.
[0015] Optionally, the through hole is an elongated hole, a round hole, or an elliptical hole.
[0016] 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.
[0017] The beneficial effects of this utility model are:
[0018] This utility model provides a battery casing that utilizes multiple through holes formed on an insulating structural component to create a closed area opposite to the electrolyte injection hole on the contact portion located on the same side as the injection hole. This prevents the electrolyte flowing out of the injection hole from immediately exiting the insulating structural component through the through holes. Instead, the electrolyte must first fall onto the closed area and then be diverted into the through holes located around the closed area before it can flow out of the insulating structural component. This closed area mitigates the impact force of the electrolyte after injection from the injection hole, reduces damage to the electrode assembly during injection, improves product quality, and increases product yield.
[0019] This utility model also provides a battery that, by applying the aforementioned battery casing, effectively improves the protection of the electrode assembly during liquid injection, thereby preventing damage to the electrode assembly, reducing the product scrap rate, and lowering manufacturing costs. Attached Figure Description
[0020] Figure 1 This is a schematic diagram showing the disassembled structure of the cover plate body and the insulating structural component in the battery casing provided by this utility model;
[0021] Figure 2 This is a cross-sectional view of the battery casing provided by this utility model after the cover plate body and the insulating structural components are assembled.
[0022] Figure 3 yes Figure 2 Enlarged view of the structure of Part I;
[0023] Figure 4 This is a schematic diagram of the insulating structure in the battery casing provided by this utility model;
[0024] Figure 5 This is a partial structural disassembly diagram of the battery provided by this utility model.
[0025] In the picture:
[0026] 100, pole assembly; 200, outer casing; 300, pole tabs;
[0027] 1. Cover plate body; 11. Injection hole; 12. Drainage boss; 13. Insertion boss;
[0028] 2. Insulating structural component; 21. Clearance through hole; 22. Abutment part; 23. Conductive hole; 24. Blocking area; 25. Connecting groove; 26. First reinforcing plate; 27. Second reinforcing plate. Detailed Implementation
[0029] 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, and not the entire structure.
[0030] 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.
[0031] 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.
[0032] 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.
[0033] 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.
[0034] Therefore, in order to reduce the impact force during electrolyte injection, reduce damage to the electrode assembly during injection, improve product quality, and increase product yield, this embodiment provides a battery casing.
[0035] like Figures 1 to 5 As shown, the battery casing includes a cover plate body 1, a casing body 200, and an insulating structural member 2. The casing body 200 is a hollow shell structure with an opening. The cover plate body 1 is located at the opening of the casing body 200 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 200 opposite to the side of the electrode assembly 100 extending from the tab 300. The insulating structural member 2 is located in the receiving cavity and is provided on the side of the electrode assembly 100 extending from the tab. On one side of 300, the insulating structure 2 includes a clearance through hole 21 for avoiding the electrode tab 300 and abutment portions 22 provided on both sides of the clearance through hole 21 along the first direction. The abutment portions 22 abut against the electrode assembly 100. Multiple through holes 23 are provided on the abutment portions 22 located on the same side as the liquid injection hole 11. The multiple through holes 23 are used to allow the electrolyte to pass through the insulating structure 2 when liquid is injected. The multiple through holes 23 form a closed area 24 on the abutment portions 22 opposite to the liquid injection hole 11.
[0036] The battery casing utilizes multiple through holes 23 formed on the insulating structure 2 to create a blocking area 24 opposite to the injection hole 11 on the contact portion 22 located on the same side as the injection hole 11. This prevents the electrolyte flowing out of the injection hole 11 from immediately flowing out of the insulating structure 2 through the through holes 23. Instead, it first falls onto the blocking area 24 and then flows into the through holes 23 located around the blocking area 24 before flowing out of the insulating structure 2. Thus, the blocking area 24 mitigates the impact force of the electrolyte after it is injected from the injection hole 11, reduces damage to the electrode assembly 100 during injection, improves product quality, and increases product yield.
[0037] 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 300 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 tab 300 extending from the tab 300 is opposite to a wall of the outer casing body 200, the injection hole 11 is located on the wall of the outer casing body 200 opposite to the tab 300. 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. The shape of the closed area 24 surrounded by multiple through holes 23 on the insulating structure 2 can be freely set according to requirements; it can be a circular area or a rectangular area, etc. In this embodiment, the closed area 24 surrounded by multiple through holes 23 on the insulating structure 2 is a rectangular area, and the multiple through holes 23 are distributed around the closed area 24. In addition, the insulating structural component 2 is made of plastic, which serves both as insulation and prevents damage to the electrode assembly 100 when fixing it. The through hole 23 can be an elongated hole, a round hole, or an elliptical hole, and the specific type of the through hole 23 can be selected according to design requirements.
[0038] Optionally, the flow area of the injection hole 11 is S1, and the area of the blocking region 24 is S2, satisfying 2.25≤S2 / S1≤4. By limiting the flow area S1 of the injection hole 11 and the area S2 of the blocking region 24 to satisfy 2.25≤S2 / S1≤4, on the one hand, it avoids the blocking region 24 area S2 being too small, resulting in the electrolyte flowing from the blocking region 24 to the through hole 23 being too short, thus reducing the buffering effect; on the other hand, it avoids the blocking region 24 area S2 being too large, resulting in the area where the through hole 23 is arranged being too small, thus reducing the flow rate.
[0039] Therefore, in order to verify the effect of the ratio of the area S2 of the above-mentioned blocking region 24 to the flow area S1 of the injection hole 11 on the electrolyte wetting speed of the electrode assembly 100 and the impact on the electrode assembly 100 when the electrolyte is injected, as shown in Table 1, three sets of embodiments and two sets of comparative examples are provided to verify both.
[0040] Table 1
[0041]
[0042] In Example 1, the ratio of the area S2 of the occluded region 24 to the flow area S1 of the injection hole 11 was set to 2.5. Experiments verified that the electrolyte wetting time of the electrode assembly 100 met the process requirements and the electrode assembly 100 was undamaged.
[0043] In Example 2, the ratio of the area S2 of the occluded region 24 to the flow area S1 of the injection hole 11 was set to 3.0. Experimental verification showed that the electrolyte wetting time of the electrode assembly 100 met the process requirements and the electrode assembly 100 was undamaged.
[0044] In Example 3, the ratio of the area S2 of the occluded region 24 to the flow area S1 of the injection hole 11 was set to 4.0. Experimental verification showed that the electrolyte wetting time of the electrode assembly 100 met the process requirements and the electrode assembly 100 was undamaged.
[0045] As can be seen from Examples 1 to 3, when the ratio of the area S2 of the blocked area 24 to the flow area S1 of the injection hole 11 is within the range of 2.25≤S2 / S1≤4, the electrolyte wetting time of the electrode assembly 100 meets the process requirements, the wetting speed is fast, the wetting requirements of the electrode assembly 100 are met, and the impact of the electrolyte on the electrode assembly 100 during injection is effectively mitigated, thus avoiding damage to the electrode assembly 100 under impact.
[0046] In Comparative Example 1, the ratio of the area S2 of the occluded zone 24 to the flow area S1 of the injection hole 11 was set to 2.0. Experimental verification showed that the electrolyte wetting time of the electrode assembly 100 met the process requirements, but the electrode assembly 100 was damaged, with a damage rate of 0.023%.
[0047] In Comparative Example 2, the ratio of the area S2 of the blocked area 24 to the flow area S1 of the injection hole 11 was set to 5.0. Experimental verification showed that the electrode assembly 100 was undamaged, and the electrolyte wetting time of the electrode assembly 100 exceeded the process requirement range by about 2.1%.
[0048] As shown in Comparative Examples 1 and 2, when the ratio of the area S2 of the blocked region 24 to the flow area S1 of the injection hole 11 is less than the minimum value of the range 2.25 ≤ S2 / S1 ≤ 4, the electrolyte wetting time of the electrode assembly 100 meets the process requirements, and the wetting speed is fast, satisfying the wetting needs of the electrode assembly 100. However, because the area S2 of the blocked region 24 is too small, its ability to mitigate impact is limited. Therefore, the electrode assembly 100 is damaged due to impact during electrolyte injection. When the area S2 of the blocked region 24 is too small, the electrode assembly 100 is damaged due to impact. When the ratio of the area S2 of the injection hole 11 to the flow area S1 of the injection hole 11 is greater than the maximum value of the range 2.25≤S2 / S1≤4, the occlusion area 24 has a large area and therefore has a high ability to mitigate impact. Thus, the electrode assembly 100 is not damaged by the impact of the electrolyte during electrolyte injection. However, because the area of the occlusion area 24 is too large, the area for laying the through holes 23 is too small, reducing the flow rate and causing the electrolyte to wet the electrode assembly 100 for a time exceeding the process requirements, resulting in a slow wetting speed.
[0049] Optionally, such as Figure 2 , Figure 3As shown, among the multiple projections of the multiple through holes 23 along the second direction on the cover plate body 1, the distance between the projection of the through hole 23 closest to the injection hole 11 and the edge of the injection hole 11 is A, and satisfies 5mm≤A≤8mm. By limiting the distance A between the projection of the edge of the injection hole 11 and the projection of the multiple through holes 23 closest to the injection hole 11, making it satisfy 5mm≤A≤8mm, on the one hand, it avoids the distance being too small, which would result in the electrolyte flowing from the injection hole 11 to the through hole 23 being too short, causing poor buffering effect; on the other hand, it avoids the distance flowing from the injection hole 11 to the through hole 23 being too long, resulting in a longer electrolyte wetting time of the electrode assembly 100, affecting the wetting speed and efficiency.
[0050] Therefore, in order to verify the effect of the distance dimension A between the projection of the edge of the injection hole 11 and the projection of the plurality of through holes 23 that is closest to the injection hole 11 on the electrolyte wetting speed of the electrode assembly 100 and the impact on the electrode assembly 100 when the electrolyte is injected, as shown in Table 2, three sets of embodiments and two sets of comparative examples are provided to verify both.
[0051] Table 2
[0052]
[0053] In Example 4, the distance A between the projection of the closest through hole 23 to the injection hole 11 and the projection of the multiple through holes 23 is set to 5mm. Experiments have verified that the electrolyte wetting time of the electrode assembly 100 meets the process requirements and the electrode assembly 100 is undamaged.
[0054] In Example 5, the distance A between the projection of the closest through hole 23 to the injection hole 11 and the projection of the multiple through holes 23 is set to 6 mm. Experiments have verified that the electrolyte wetting time of the electrode assembly 100 meets the process requirements and the electrode assembly 100 is undamaged.
[0055] In Example 6, the distance A between the projection of the closest through hole 23 to the injection hole 11 and the projection of the multiple through holes 23 is set to 8mm. Experiments have verified that the electrolyte wetting time of the electrode assembly 100 meets the process requirements and the electrode assembly 100 is undamaged.
[0056] As can be seen from Examples 4 to 6, when the distance A between the edge of the injection hole 11 and the projection of the plurality of through holes 23 that is closest to the injection hole 11 is within the range of 5mm≤A≤8mm, the electrolyte wetting time of the electrode assembly 100 meets the process requirements, the wetting speed is fast, the wetting requirements of the electrode assembly 100 are met, and the impact of the electrolyte on the electrode assembly 100 during injection is effectively mitigated, thus avoiding damage to the electrode assembly 100 under impact.
[0057] In Comparative Example 3, the distance A between the projection of the closest through hole 23 to the injection hole 11 and the projection of the multiple through holes 23 was set to 4 mm. Experimental verification showed that the electrolyte wetting time of the electrode assembly 100 met the process requirements, but the electrode assembly 100 was damaged, with a damage rate of 0.031%.
[0058] In Comparative Example 4, the distance A between the projection of the closest through hole 23 to the injection hole 11 and the projection of the multiple through holes 23 was set to 9 mm. Experimental verification showed that the electrode assembly 100 was undamaged, and the electrolyte wetting time of the electrode assembly 100 exceeded the process requirement range by about 2.3%.
[0059] As can be seen from Comparative Examples 3 and 4, when the distance A between the projection of the edge of the injection hole 11 and the projection of the multiple through holes 23 that is closest to the injection hole 11 is less than the minimum value of the range of 5mm≤A≤8mm, 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. However, because the distance from the electrolyte flowing out of the injection hole 11 to the through hole 23 is too short, the buffering effect is not good. Therefore, the electrode assembly 100 is damaged due to the impact when the electrolyte is injected.
[0060] When the distance A between the edge of the injection hole 11 and the projection of the nearest projection to the injection hole 11 among the multiple through holes 23 is greater than the maximum value of the range 5mm≤A≤8mm, the electrolyte has a higher ability to mitigate impact because the distance from the injection hole 11 to the through hole 23 is relatively long. Therefore, the electrode assembly 100 is not damaged by the impact of the electrolyte during electrolyte injection. However, because the distance from the injection hole 11 to the through hole 23 is relatively long, the electrolyte flow time is longer, causing the electrolyte wetting time of the electrode assembly 100 to exceed the process requirements and the wetting speed to be slower.
[0061] Optionally, the total flow area of the plurality of through holes 23 is S3, and the bottom area of the abutment portion 22 with the plurality of through holes 23 is S4, satisfying 0.4≤S3 / S4≤0.65. By limiting the total flow area S3 of the plurality of through holes 23 and the bottom area S4 of the abutment portion 22 with the plurality of through holes 23, so that both satisfy 0.4≤S3 / S4≤0.65, on the one hand, the proportion of the total flow area S3 of the plurality of through holes 23 is too small, resulting in a low flow velocity; on the other hand, the proportion of the total flow area S3 of the plurality of through holes 23 is too large, resulting in a decrease in the structural strength of the abutment portion 22 of the insulating structure 2, making it easy to deform when the electrode group 100 is fixed by the abutment portion 22, thus failing to guarantee the stability of fixing the electrode group 100.
[0062] Therefore, in order to verify the magnitude of the ratio of the total flow area S3 of the multiple through holes 23 to the bottom area S4 of the abutment portion 22 with multiple through holes 23, and its influence on the electrolyte wetting speed of the electrode assembly 100 and the structural strength of the abutment portion 22, as shown in Table 3, three sets of embodiments and two sets of comparative examples are provided to verify both.
[0063] Table 3
[0064]
[0065] In Example 7, the ratio of the total flow area S3 of the plurality of through holes 23 to the bottom area S4 of the abutment portion 22 with the plurality of through holes 23 is set to 0.4. Experimental verification shows that the electrolyte wetting time of the electrode assembly 100 meets the process requirements and the deformation of the abutment portion 22 is small.
[0066] In Example 8, the ratio of the total flow area S3 of the plurality of through holes 23 to the bottom area S4 of the abutment portion 22 with the plurality of through holes 23 is set to 0.5. Experimental verification shows that the electrolyte wetting time of the electrode assembly 100 meets the process requirements and the deformation of the abutment portion 22 is small.
[0067] In Example 9, the ratio of the total flow area S3 of the plurality of through holes 23 to the bottom area S4 of the abutment portion 22 with the plurality of through holes 23 is set to 0.65. Experimental verification shows that the electrolyte wetting time of the electrode assembly 100 meets the process requirements and the deformation of the abutment portion 22 is small.
[0068] As can be seen from Examples 7 to 9, when the ratio of the total flow area S3 of the plurality of through holes 23 to the bottom area S4 of the abutment portion 22 with the plurality of through holes 23 is within the range of 0.4≤S3 / S4≤0.65, 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. Moreover, the abutment portion 22 has good structural strength and small deformation after abutting with the electrode assembly 100.
[0069] In Comparative Example 5, the ratio of the total flow area S3 of the multiple through holes 23 to the bottom area S4 of the abutment portion 22 with multiple through holes 23 was set to 0.3. Experimental verification showed that the deformation of the abutment portion 22 was small, but the electrolyte wetting time of the electrode assembly 100 exceeded the process requirement range by about 3.3%.
[0070] In Comparative Example 6, the ratio of the total flow area S3 of the multiple through holes 23 to the bottom area S4 of the contact portion 22 with multiple through holes 23 was set to 0.7. Experimental verification showed that the electrolyte immersion time of the electrode assembly 100 met the process requirements, and the contact portion 22 deformed significantly.
[0071] As can be seen from Comparative Examples 5 and 6, when the ratio of the total flow area S3 of the multiple through holes 23 to the bottom area S4 of the contact portion 22 with multiple through holes 23 is less than the minimum value of the range 0.4≤S3 / S4≤0.65, although the deformation of the contact portion 22 after contacting the electrode assembly 100 is small, the total flow area S3 of the multiple through holes 23 is too small, resulting in a low flow rate and the time for the electrolyte to wet the electrode assembly 100 exceeds the process requirements, and the wetting speed is slow.
[0072] When the ratio of the total flow area S3 of the multiple through holes 23 to the bottom area S4 of the abutment portion 22 with the multiple through holes 23 is greater than the maximum value in the range of 0.4≤S3 / S4≤0.65, the total flow area S3 of the multiple through holes 23 is large, resulting in a faster flow rate. This allows the electrolyte to wet the electrode assembly 100 in time to meet the process requirements, and the wettability is fast, satisfying the wettability requirements of the electrode assembly 100. However, because the total flow area S3 of the multiple through holes 23 is large, the structural strength of the abutment portion 22 is reduced, resulting in a larger deformation when the abutment portion 22 abuts against the electrode assembly 100.
[0073] Optionally, such as Figure 1 As shown, the cover plate body 1 or the outer shell body 200 with an injection hole 11 has a flow-guiding protrusion 12 on the side facing the insulating structure 2. The flow-guiding protrusion 12 extends in the direction close to the blocking area 24, and the injection hole 11 passes through the flow-guiding protrusion 12. By setting the flow-guiding protrusion 12, when electrolyte is injected, the electrolyte can be guided by the flow-guiding protrusion 12 to ensure that the electrolyte does not exceed the range of the blocking area 24 when it flows out of the injection hole 11. This prevents some electrolyte from flowing out directly through the through hole 23 without passing through the buffer of the blocking area 24, thereby causing an impact on the electrode assembly 100.
[0074] In this embodiment, since the injection hole 11 is located on the cover plate body 1, the drainage protrusion 12 is located on the side of the cover plate body 1 facing the insulating structure 2. The shape of the drainage protrusion 12 can be freely set according to requirements, and can be a circular protrusion or a rectangular protrusion, etc. It should be noted that there is a certain gap between the end of the drainage protrusion 12 facing the insulating structure 2 and the blocking area 24, so as to ensure that the electrolyte flowing out from the drainage protrusion 12 can be diverted to the through hole 23 through the gap between the drainage protrusion 12 and the blocking area 24.
[0075] Optionally, such as Figure 1 , Figure 5 As shown, the insulating structural component 2 has a connecting groove 25 on the side facing away from the electrode assembly 100. A clearance through-hole 21 penetrates the bottom of the connecting groove 25, forming abutment portions 22 on both sides of the clearance through-hole 21 along the first direction. The cover plate body 1 or the outer shell body 200, which has an injection hole 11, has an insertion boss 13 on the side facing the insulating structural component 2. The insertion boss 13 is inserted into the connecting groove 25. By providing the connecting groove 25 and the insertion boss 13, when the insertion boss 13 is inserted into the connecting groove 25, the insulating structural component 2 can be limited during assembly, preventing misalignment.
[0076] In this embodiment, since the injection hole 11 is opened on the cover plate body 1, the insertion boss 13 is provided on the side of the cover plate body 1 facing the insulating structure 2, wherein the shape of the insertion boss 13 matches the shape of the connecting groove 25.
[0077] Optionally, such as Figure 1 , Figure 5 As shown, the insulating structure 2 also includes a first reinforcing plate 26, and multiple first reinforcing plates 26 are provided on the side of each abutment portion 22 facing away from the electrode assembly 100. Since the insulating structure 2 has the function of fixing the electrode assembly 100 in addition to insulation, the structural strength of the insulating structure 2 will be reduced when the connecting groove 25 is opened, which will cause the abutment portion 22 of the insulating structure 2 to easily deform when it is pressed against the electrode assembly 100, making it impossible to effectively fix the electrode assembly 100. Therefore, by providing multiple first reinforcing plates 26 on the side of each abutment portion 22 facing away from the electrode assembly 100, the structural strength of the abutment portion 22 of the insulating structure 2 is improved.
[0078] The number of the first reinforcing plates 26 can be freely set according to the requirements. In this embodiment, three first reinforcing plates 26 are provided at intervals in the area of each abutment part 22.
[0079] Optionally, such as Figure 1 , Figure 5As shown, the insulating structural member 2 also includes a second reinforcing plate 27, and each first reinforcing plate 26 is optionally connected to a second reinforcing plate 27, with the first reinforcing plate 26 and the second reinforcing plate 27 perpendicular to each other. By providing a second reinforcing plate 27 that is perpendicularly connected to the first reinforcing plate 26, the structural strength at the contact portion 22 of the insulating structural member 2 is further improved.
[0080] In this embodiment, as Figure 5 As shown, 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 effectively improves the protection of the electrode assembly 100 during liquid filling, thereby preventing damage to the electrode assembly 100, reducing product scrap rates, and lowering manufacturing costs.
[0081] 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 housing, characterized by The battery casing includes a cover plate body, a casing body, and an insulating structural 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. An injection hole is provided 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 structural component is located in the cavity and is located on the side of the electrode assembly that extends out of the tab. The insulating structure includes a clearance through hole for avoiding the electrode tab and abutment portions on both sides of the clearance through hole along a first direction. The abutment portions abut against the electrode assembly. Multiple through holes are formed on the abutment portions located on the same side as the liquid injection hole. The multiple through holes are used to allow electrolyte to pass through the insulating structure during liquid injection. The multiple through holes form a closed area on the abutment portions opposite to the liquid injection hole.
2. The battery case of claim 1, wherein, The flow area of the injection hole is S1, the area of the occlusion zone is S2, and the condition 2.25≤S2 / S1≤4 is satisfied.
3. The battery case of claim 1, wherein, Among the multiple projections of the multiple through holes on the wall surface of the cover plate body or the outer shell body along the second direction, the distance between the projection of the through hole closest to the injection hole and the edge of the injection hole is A, and satisfies 5mm≤A≤8mm.
4. The battery case of claim 1, wherein, The total flow area of the plurality of through holes is S3, and the bottom area of the abutment portion having the plurality of through holes is S4, and satisfies 0.4≤S3 / S4≤0.
65.
5. The battery case of claim 1, wherein, The cover plate body or the outer shell body with the injection hole has a drainage protrusion on the side facing the insulating structure. The drainage protrusion extends in the direction close to the occlusion area, and the injection hole passes through the drainage protrusion.
6. The battery case of claim 1, wherein, The insulating structural member has a connecting groove on the side away from the electrode group. The clearance through hole penetrates the bottom of the connecting groove and makes the insulating structural member form the abutment part on both sides of the clearance through hole along the first direction. The wall surface of the cover plate body or the outer shell body with the liquid injection hole has an insertion boss on the side facing the insulating structural member. The insertion boss is inserted into the connecting groove.
7. The battery case of claim 6, wherein, The insulating structural component also includes a first reinforcing plate, and each of the abutting portions has a plurality of the first reinforcing plates on the side opposite to the electrode assembly.
8. The battery case of claim 7, wherein, The insulating structural component further includes a second reinforcing plate, and each of the first reinforcing plates is optionally connected to the second reinforcing plate, wherein the first reinforcing plate and the second reinforcing plate are perpendicular to each other.
9. The battery case of claim 1, wherein, The through hole can be an elongated hole, a round hole, or an elliptical hole.
10. A battery characterized by 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.