Battery housing and battery

Abstract

The present invention belongs to the technical field of batteries, and discloses a battery housing and a battery. The battery housing includes a cover body, a housing body and an insulating structural member. A liquid injection hole is formed on the wall surface of the cover body or the housing body opposite to the tab of the electrode group. A diversion structure is formed on the side of the insulating structural member facing away from the cover body. A through hole is also formed on the insulating structural member and is disposed within the diversion structure. The compression amount of the insulating structural member compressed along the first direction after being in contact with the electrode group is A, and the depth dimension of the diversion structure along the first direction is H, and 0.4 ≤ A / H ≤ 0.5 is satisfied. When the insulating structural member is in contact with the electrode group, even if the insulating structural member undergoes compressive deformation, a space for electrolyte flow can still be reserved, solving the problem that the electrolyte can only infiltrate the electrode group by osmosis due to the compressive deformation of the insulating structural member in contact with the electrode group, improving the speed of infiltrating the electrode group, shortening the time of infiltrating the electrode group, and improving the efficiency of the infiltration operation.

Description

Technical Field

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

[0002] Lithium-ion batteries are currently widely used in various fields such as transportation power sources, power energy storage power sources, new energy storage power sources, aerospace and military industries due to their advantages such as large capacity, high working voltage, strong charge retention ability, and long cycle life. The structure of a single lithium battery generally includes a pole group, electrolyte, cover plate, housing, internal and external insulation structures, etc. Among them, the cover plate and the housing are usually fixed by laser welding to form a sealed space that protects the pole group with a certain structural strength. The cover plate generally integrates functional areas such as pole columns, explosion-proof valves, and liquid injection holes. Among them, the liquid injection hole is usually arranged on the cover plate, and a through hole communicating with the liquid injection hole is opened on the internal insulation structure, so as to facilitate the inflow of the electrolyte to achieve the purpose of infiltrating the pole group.

[0003] Among them, because the battery may not be in a fixed state during use, it may also be in a continuously moving working condition, which may cause the battery to vibrate during movement. Therefore, in order to ensure the stability of the pole group inside the battery, when assembling the battery, the pole group is fixed by using an internal insulating part to squeeze the pole group. However, during the squeezing process, a part of the liquid injection channel communicating with the liquid injection hole on the internal insulation structure may be blocked by the pole group or all the liquid injection channels may be blocked by the pole group, resulting in the electrolyte relying only on osmosis to slowly penetrate into the interior to achieve the infiltration of the pole group. The infiltration speed is slow, the infiltration time is long, and the infiltration operation efficiency is low. Summary of the Invention

[0004] The purpose of the present invention is to provide a battery housing and a battery with fast infiltration speed, short infiltration time, and high infiltration operation efficiency.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] On the one hand, a battery housing is provided. The battery housing includes a cover plate body, a housing body, and an insulation structure member. The housing body is a hollow housing structure with an open mouth. The cover plate body is arranged at the open mouth of the housing body to form a receiving cavity for receiving the pole group. A liquid injection hole is opened on the wall surface of the cover plate body or the housing body opposite to the pole tab of the pole group. The insulation structure member is located in the receiving cavity and is arranged on the side where the pole group extends out of the pole tab.

[0007] The side of the insulation structure member facing away from the cover plate body is recessed in a direction away from the pole group to form a diversion structure. A through hole communicating with the liquid injection hole is also opened on the insulation structure member, and the through hole is arranged in the diversion structure.

[0008] After the insulating structural member abuts against the electrode group, the compression amount compressed in the first direction is A, the depth dimension of the diversion structure in the first direction is H, and 0.4≤A / H≤0.5 is satisfied.

[0009] Optionally, the diversion structure includes a diversion sink and at least one diversion groove communicated with the diversion sink, and the guide through hole is arranged in the area surrounded by the diversion sink.

[0010] Optionally, the width dimension of the diversion groove perpendicular to the first direction is W, and 2mm≤W≤5mm is satisfied.

[0011] Optionally, at least one reinforcing rib is further arranged in the guide through hole of the insulating structural member, and at least one of the reinforcing ribs is used for dividing the guide through hole into a plurality of diversion holes.

[0012] Optionally, the total area of the plurality of diversion holes is S1, the flow area of the liquid injection hole is S2, and 4≤S1 / S2≤6 is satisfied.

[0013] Optionally, the thickness dimension of the reinforcing rib in the first direction is T, and 0.7mm≤T≤1mm is satisfied.

[0014] Optionally, the width dimension of the reinforcing rib perpendicular to the first direction is M, and 1.5mm≤M≤2mm is satisfied.

[0015] Optionally, the insulating structural member includes a through hole penetrating through the insulating structural member and abutting portions located on both sides of the through hole in the second direction, the abutting portions abut against the electrode group, and are respectively provided with the diversion structure and the guide through hole arranged in the diversion structure.

[0016] Optionally, a plurality of uniformly distributed weakening structures are arranged on each of the abutting portions, and the weakening structures penetrate through the abutting portions.

[0017] On the other hand, a battery is provided, and the battery includes an electrode group and the battery case as described in any one of the above, and the electrode group is accommodated in the battery case.

[0018] Advantages of the present invention:

[0019] The present invention provides a battery housing. A diversion structure is formed on the side of the insulating structural member away from the cover body, and the through hole communicating with the liquid injection hole is arranged in the diversion structure formed by the insulating structural member being recessed in the direction away from the electrode group. The relationship between the compression amount A of the insulating structural member compressed in the first direction after abutting against the electrode group and the depth dimension H of the diversion structure in the first direction is defined to satisfy 0.4 ≤ A / H ≤ 0.5, so as to ensure that when the insulating structural member abuts against the electrode group, even if the insulating structural member undergoes compressive deformation, a space for electrolyte flow can still be reserved, solving the problem that the electrolyte can only infiltrate the electrode group by osmosis due to the compressive deformation of the insulating structural member when it abuts against the electrode group, greatly improving the speed of electrolyte infiltration of the electrode group, shortening the time for electrolyte to infiltrate the electrode group, and improving the efficiency of the infiltration operation.

[0020] The present invention also provides a battery. By applying the above battery housing, the time for electrolyte infiltration operation can be effectively shortened, the assembly rate can be improved, and the production cycle can be shortened. Brief Description of the Drawings

[0021] Figure 1 is a structural split view of the cover body and the insulating structural member in the battery housing provided by the present invention from the first perspective;

[0022] Figure 2 is a structural split view of the cover body and the insulating structural member in the battery housing provided by the present invention from the second perspective;

[0023] Figure 3 is a schematic structural view of the insulating structural member in the battery housing provided by the present invention;

[0024] Figure 4 is a partial structural schematic view of the battery provided by the present invention.

[0025] In the figure:

[0026] 100, electrode group;

[0027] 1, cover body; 11, liquid injection hole; 12, plug-in boss;

[0028] 2, insulating structural member; 21, diversion structure; 211, diversion sink; 212, shunt groove; 22, through hole; 221, reinforcing rib; 222, shunt hole; 23, plug-in groove; 24, through-through hole; 25, abutting portion; 26, weakening structure;

[0029] 3, housing body. Detailed Embodiments

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that for the convenience of description, only parts related to the present invention are shown in the drawings, rather than all structures.

[0031] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral body; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0032] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "over", and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath", and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.

[0033] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0034] When the inner insulating member fixes the electrode group, the inner insulating member will cause partial or complete blockage of the liquid injection channel for electrolyte circulation due to compression deformation, resulting in that the electrolyte can only rely on osmosis to gradually penetrate into the interior to achieve the infiltration of the electrode group. Its infiltration speed is slow, the infiltration time is long, and the infiltration operation efficiency is low.

[0035] Therefore, in order to solve the problem that the insulating structural member causes the electrolyte to infiltrate the electrode group only by osmosis due to compression deformation when contacting the electrode group, improve the speed of the electrolyte infiltrating the electrode group, shorten the time for the electrolyte to infiltrate the electrode group, and improve the efficiency of the infiltration operation, this embodiment provides a battery housing.

[0036] Such asFigures 1 to 4 As shown, the battery housing includes a cover body 1, a housing body 3, and an insulating structure member 2. The housing body 3 is a hollow shell structure with an open end. The cover body 1 is disposed at the open end of the housing body 3 to form a receiving cavity for receiving the electrode group 100. A liquid injection hole 11 is formed on the wall surface of the cover body 1 or the housing body 3 opposite to the electrode tab of the electrode group 100. The insulating structure member 2 is located in the receiving cavity and is disposed on the side where the electrode group 100 extends out of the electrode tab. The side of the insulating structure member 2 facing away from the cover body 1 is recessed in a direction away from the electrode group 100 to form a flow guiding structure 21. A through hole 22 communicating with the liquid injection hole 11 is also formed on the insulating structure member 2. The through hole 22 is disposed in the flow guiding structure 21. The compression amount of the insulating structure member 2 compressed in the first direction after contacting the electrode group 100 is A, and the depth dimension of the flow guiding structure 21 in the first direction is H, and 0.4 ≤ A / H ≤ 0.5 is satisfied.

[0037] The battery housing forms a flow guiding structure 21 on the side of the insulating structure member 2 facing away from the cover body 1, and disposes the through hole 22 communicating with the liquid injection hole 11 in the flow guiding structure 21 formed by the insulating structure member 2 recessed in a direction away from the electrode group 100. The relationship between the compression amount A of the insulating structure member 2 compressed in the first direction after contacting the electrode group 100 and the depth dimension H of the flow guiding structure 21 in the first direction is defined to satisfy 0.4 ≤ A / H ≤ 0.5. Thus, when the insulating structure member 2 contacts the electrode group 100, even if the insulating structure member 2 undergoes compressive deformation, a space for electrolyte flow can still be reserved, solving the problem that the electrolyte can only infiltrate the electrode group 100 by osmosis due to the compressive deformation of the insulating structure member 2 when contacting the electrode group 100. The speed of electrolyte infiltration into the electrode group 100 is greatly improved, the time for electrolyte infiltration into the electrode group 100 is shortened, and the efficiency of the infiltration operation is improved.

[0038] In this embodiment, in order to ensure the structural stability of the cover body 1 and the insulating structure 2 after assembly, a plug-in boss 12 is provided on the side of the cover body 1 facing the insulating structure 2, and a plug-in groove 23 is provided on the side of the insulating structure 2 facing the cover body 1, and the plug-in boss 12 is inserted into the plug-in groove 23, so as to achieve positioning and limiting during assembly. The insulating structure 2 is a plastic part integrally formed by an injection molding process, which is used to ensure the insulation of the insulating structure 2 on the one hand, and to facilitate the formation of the required flow guide structure 21 on the insulating structure 2 during production on the other hand. The injection hole 11 can be opened at different positions according to the structural design. When the side of the pole group 100 extending from the pole ear is opposite to the cover body 1, the injection hole 11 is opened on the cover body 1. When the side of the pole group 100 extending from the pole ear is opposite to a wall of the shell body 3, the injection hole 11 is opened on the wall of the shell body 3 opposite to the pole ear. In this embodiment, the injection hole 11 is opened on the cover body 1. And the battery casing can be used on many different types of batteries, such as blade batteries, square shell batteries or large cylindrical batteries.

[0039] Alternatively, if Figure 3 As shown, the flow guiding structure 21 includes a flow guiding platform 211 and at least one flow dividing groove 212 connected to the flow guiding platform 211, and the conducting hole 22 is arranged in the area surrounded by the flow guiding platform 211. The flow guiding structure 21 is formed by adopting the structure of the flow guiding platform 211 and the flow dividing groove 212, so that while retaining the material of the insulating structure 2 as much as possible, the area covered by the flow guiding structure 21 is expanded, thereby further reducing the area of the flow guiding structure 21 blocked by the electrode group 100 and improving the injection rate of the electrolyte while reducing the influence on the strength of the insulating structure 2.

[0040] The shape of the guide platform 211 can be freely set according to actual needs, such as circular, elliptical or polygonal. In this embodiment, the guide platform 211 is rectangular. In addition, the number of diverter slots 212 connected to the guide platform 211 and the shape of the longitudinal section of the diverter slot 212 can also be freely set according to actual needs. In this embodiment, the guide structure 21 is provided with four evenly distributed rectangular diverter slots 212.

[0041] Alternatively, if Figure 3 As shown, the width dimension of the shunt groove 212 along the direction perpendicular to the first direction is W, and satisfies 2mm≤W≤5mm. By limiting the width dimension W of the shunt groove 212 along the direction perpendicular to the first direction to satisfy 2mm≤W≤5mm, on the one hand, the size of the shunt groove 212 is prevented from being too small, the flow rate of the electrolyte in the shunt groove 212 is limited, and the infiltration speed is reduced; on the other hand, the size of the shunt groove 212 is prevented from being too large, which reduces the structural strength of the insulating structure 2 and affects the fixing effect of the insulating structure 2 on the electrode group 100.

[0042] Among them, the width dimension W of the flow dividing groove 212 along the direction perpendicular to the first direction can be any value between 2 mm and 5 mm or the range between any two values, such as 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, etc.

[0043] In order to verify the influence of the depth dimension H of the diversion structure 21 along the first direction and the compression amount A by which the insulation structure member 2 is compressed along the first direction after abutting against the electrode group 100 on the electrolyte infiltration rate of the electrode group 100, the width dimension W of the flow dividing groove 212 along the direction perpendicular to the first direction is set to a fixed value of 2 mm, and as shown in Table 1, three groups of examples and five groups of comparative examples are provided to verify both the compression amount A and the depth dimension H, and the time consumed for liquid injection is recorded. If the liquid injection time is less than 25 min, the time requirement of the liquid injection process is met.

[0044] Table 1

[0045]

[0046] In Example 1, the compression amount A by which the insulation structure member 2 is compressed along the first direction after abutting against the electrode group 100 is set to 2.5 mm, and the depth dimension H of the diversion structure 21 along the first direction is set to 5 mm. At this time, the ratio of A / H is 0.5, which satisfies the range of 0.4 ≤ A / H ≤ 0.5. Through experimental verification, the liquid injection time is 24 min < 25 min, meeting the requirements of the liquid injection process.

[0047] In Example 2, the compression amount A by which the insulation structure member 2 is compressed along the first direction after abutting against the electrode group 100 is set to 2.5 mm, and the depth dimension H of the diversion structure 21 along the first direction is set to 5.5 mm. At this time, the ratio of A / H is 0.45, which satisfies the range of 0.4 ≤ A / H ≤ 0.5. Through experimental verification, the liquid injection time is 23 min < 25 min, meeting the requirements of the liquid injection process.

[0048] In Example 3, the compression amount A by which the insulation structure member 2 is compressed along the first direction after abutting against the electrode group 100 is set to 2.5 mm, and the depth dimension H of the diversion structure 21 along the first direction is set to 6.0 mm. At this time, the ratio of A / H is 0.42, which satisfies the range of 0.4 ≤ A / H ≤ 0.5. Through experimental verification, the liquid injection time is 22 min < 25 min, meeting the requirements of the liquid injection process.

[0049] As can be seen from Examples 1 to 3, when the ratio of the compression amount A of the insulating structural member 2 compressed in the first direction after contacting the electrode group 100 to the depth dimension H of the current guiding structure 21 in the first direction satisfies the range of 0.4 ≤ A / H ≤ 0.5, even if the insulating structural member 2 is compressed and deformed after contacting the electrode group 100, it can still provide sufficient space for the flow of the electrolyte. As a result, the time for the electrolyte to infiltrate the electrode group 100 is less than the specified time of 25 min, meeting the requirements of the liquid injection process, so as to match the production rhythm of subsequent assembly operations and ensure the smooth operation of the assembly line.

[0050] In Comparative Example 1, the compression amount A of the insulating structural member 2 compressed in the first direction after contacting the electrode group 100 is set to 2.5 mm, and the depth dimension H of the current guiding structure 21 in the first direction is set to 4.0 mm. At this time, the ratio of A / H is 0.625, which is greater than the maximum value of the range of 0.4 ≤ A / H ≤ 0.5. Through experimental verification, since the depth dimension H of the current guiding structure 21 in the first direction is relatively small at this time, the electrolyte flows slowly after liquid injection, and the liquid injection takes 27 min > 25 min, which does not meet the requirements of the liquid injection process.

[0051] In Comparative Example 2, the compression amount A of the insulating structural member 2 compressed in the first direction after contacting the electrode group 100 is set to 2.5 mm, and the depth dimension H of the current guiding structure 21 in the first direction is set to 4.5 mm. At this time, the ratio of A / H is 0.56, which is greater than the maximum value of the range of 0.4 ≤ A / H ≤ 0.5. Through experimental verification, since the depth dimension H of the current guiding structure 21 in the first direction is relatively small at this time, the electrolyte flows slowly after liquid injection, and the liquid injection takes 26 min > 25 min, which does not meet the requirements of the liquid injection process.

[0052] As can be seen from Comparative Example 1 to Comparative Example 2, when the ratio of the compression amount A of the insulating structural member 2 compressed in the first direction after contacting the electrode group 100 to the depth dimension H of the current guiding structure 21 in the first direction is greater than the maximum value of the range of 0.4 ≤ A / H ≤ 0.5, when the insulating structural member 2 is compressed and deformed after contacting the electrode group 100, the depth dimension H of the current guiding structure 21 in the first direction is affected by the compression deformation and its depth becomes shallower, unable to provide sufficient space for the flow of the electrolyte, thereby delaying the flow rate of the electrolyte and prolonging the infiltration time. Eventually, the time for the electrolyte to infiltrate the electrode group 100 exceeds the specified 25 min of the liquid injection process, which does not meet the requirements of the liquid injection process, making it impossible to match the production rhythm of subsequent assembly operations, delaying the operation of the assembly line, and reducing production efficiency.

[0053] In Comparative Example 3, the compression amount A of the insulating structural member 2 compressed in the first direction after abutting against the electrode group 100 is set to 2.5 mm, and the depth dimension H of the current guiding structure 21 in the first direction is set to 6.5 mm. At this time, the ratio of A / H is 0.38, which is less than the minimum value of the range of 0.4 ≤ A / H ≤ 0.5. Through experimental verification, the liquid injection time is 21.5 min < 25 min, meeting the liquid injection process requirements. However, the H value is too large, which will cause the overall height of the insulating structural member 2 to increase, occupying too much space in the accommodating cavity, resulting in limited volume of the electrode group 100 and reduced energy density.

[0054] In Comparative Example 4, the compression amount A of the insulating structural member 2 compressed in the first direction after abutting against the electrode group 100 is set to 2.5 mm, and the depth dimension H of the current guiding structure 21 in the first direction is set to 7.0 mm. At this time, the ratio of A / H is 0.36, which is less than the minimum value of the range of 0.4 ≤ A / H ≤ 0.5. Through experimental verification, the liquid injection time is 21 min < 25 min, meeting the liquid injection process requirements. However, the H value is too large, which will cause the overall height of the insulating structural member 2 to increase, occupying too much space in the accommodating cavity, resulting in limited volume of the electrode group 100 and reduced energy density.

[0055] In Comparative Example 5, the compression amount A of the insulating structural member 2 compressed in the first direction after abutting against the electrode group 100 is set to 2.5 mm, and the depth dimension H of the current guiding structure 21 in the first direction is set to 7.5 mm. At this time, the ratio of A / H is 0.33, which is less than the minimum value of the range of 0.4 ≤ A / H ≤ 0.5. Through experimental verification, the liquid injection time is 20.7 min < 25 min, meeting the liquid injection process requirements. However, the H value is too large, which will cause the overall height of the insulating structural member to increase, occupying too much space in the accommodating cavity, resulting in limited volume of the electrode group 100 and reduced energy density.

[0056] It can be seen from Comparative Example 3 to Comparative Example 5 that when the ratio between the compression amount A of the insulating structural member 2 compressed in the first direction after abutting against the electrode group 100 and the depth dimension H of the current guiding structure 21 in the first direction is less than the minimum value of the range of 0.4 ≤ A / H ≤ 0.5, although the time for the electrolyte to infiltrate the electrode group 100 meets the process requirements at this time, due to the relatively large depth dimension H of the current guiding structure 21 in the first direction, the insulating structural member 2 increases its height dimension in order to avoid a decrease in structural strength, thereby increasing the space occupied by the insulating structural member 2, resulting in limited volume of the electrode group 100 and reduced energy density, and also increasing the manufacturing cost of the insulating structural member 2.

[0057] In order to explore the influence of the width dimension W of the flow dividing groove 212 perpendicular to the first direction on the rate of electrolyte infiltration into the electrode group 100, the ratio between the compression amount A by which the insulating structural member 2 is compressed along the first direction after abutting against the electrode group 100 and the depth dimension H of the flow guiding structure 21 along the first direction is kept the same. The width dimension W of the flow dividing groove 212 perpendicular to the first direction is changed, and the time taken to complete the liquid injection is recorded. If the liquid injection time is less than 25 min, the time requirement of the liquid injection process is met. As shown in Table 2, four groups of examples and four groups of comparative examples are provided for verification.

[0058] Table 2

[0059]

[0060] In Example 4, the compression amount A by which the insulating structural member 2 is compressed along the first direction after abutting against the electrode group 100 is set to 2.5 mm, the depth dimension H of the flow guiding structure 21 along the first direction is set to 5 mm, and the width dimension W of the flow dividing groove 212 perpendicular to the first direction is set to 2 mm. Through experimental verification, the time taken to complete the liquid injection operation is 24 min.

[0061] In Example 5, the compression amount A by which the insulating structural member 2 is compressed along the first direction after abutting against the electrode group 100 is set to 2.5 mm, the depth dimension H of the flow guiding structure 21 along the first direction is set to 5 mm, and the width dimension W of the flow dividing groove 212 perpendicular to the first direction is set to 3 mm. Through experimental verification, the time taken to complete the liquid injection operation is 23.6 min.

[0062] In Example 6, the compression amount A by which the insulating structural member 2 is compressed along the first direction after abutting against the electrode group 100 is set to 2.5 mm, the depth dimension H of the flow guiding structure 21 along the first direction is set to 5 mm, and the width dimension W of the flow dividing groove 212 perpendicular to the first direction is set to 4 mm. Through experimental verification, the time taken to complete the liquid injection operation is 22.9 min.

[0063] In Example 7, the compression amount A by which the insulating structural member 2 is compressed along the first direction after abutting against the electrode group 100 is set to 2.5 mm, the depth dimension H of the flow guiding structure 21 along the first direction is set to 5 mm, and the width dimension W of the flow dividing groove 212 perpendicular to the first direction is set to 5 mm. Through experimental verification, the time taken to complete the liquid injection operation is 22.2 min.

[0064] As can be seen from Examples 4 to 7, when the ratio between the compression amount A by which the insulating structural member 2 is compressed in the first direction after abutting against the electrode group 100 and the depth dimension H of the current guiding structure 21 in the first direction is constant, and the width dimension W of the shunt groove 212 in the direction perpendicular to the first direction is within a set range, that is, 2 mm ≤ W ≤ 5 mm and gradually increases, the liquid injection speed increases, and the time consumed to complete the liquid injection operation gradually shortens.

[0065] In Comparative Example 6, the compression amount A by which the insulating structural member 2 is compressed in the first direction after abutting against the electrode group 100 is set to 2.5 mm, the depth dimension H of the current guiding structure 21 in the first direction is set to 5 mm, and the width dimension W of the shunt groove 212 in the direction perpendicular to the first direction is set to 1 mm. After experimental verification, the time consumed to complete the liquid injection operation is 24.6 min.

[0066] In Comparative Example 7, the compression amount A by which the insulating structural member 2 is compressed in the first direction after abutting against the electrode group 100 is set to 2.5 mm, the depth dimension H of the current guiding structure 21 in the first direction is set to 5 mm, and the width dimension W of the shunt groove 212 in the direction perpendicular to the first direction is set to 1.5 mm. After experimental verification, the time consumed to complete the liquid injection operation is 24.2 min.

[0067] As can be seen from Comparative Example 6 to Comparative Example 7, when the ratio between the compression amount A by which the insulating structural member 2 is compressed in the first direction after abutting against the electrode group 100 and the depth dimension H of the current guiding structure 21 in the first direction is constant, and the width dimension W of the shunt groove 212 in the direction perpendicular to the first direction is less than the minimum value of the range 2 mm ≤ W ≤ 5 mm, compared with Example 4, the liquid injection speed slows down, the time consumed to complete the liquid injection operation increases, and approaches the limit value set by the liquid injection process requirements.

[0068] In Comparative Example 8, the compression amount A by which the insulating structural member 2 is compressed in the first direction after abutting against the electrode group 100 is set to 2.5 mm, the depth dimension H of the current guiding structure 21 in the first direction is set to 5 mm, and the width dimension W of the shunt groove 212 in the direction perpendicular to the first direction is set to 5.5 mm. After experimental verification, the time consumed to complete the liquid injection operation is 21.8 min.

[0069] In Comparative Example 9, the compression amount A by which the insulating structural member 2 is compressed in the first direction after abutting against the electrode group 100 is set to 2.5 mm, the depth dimension H of the current guiding structure 21 in the first direction is set to 5 mm, and the width dimension W of the shunt groove 212 in the direction perpendicular to the first direction is set to 6 mm. After experimental verification, the time consumed to complete the liquid injection operation is 21.1 min.

[0070] As can be seen from Comparative Example 8 to Comparative Example 9, when the ratio between the compression amount A by which the insulating structural member 2 is compressed in the first direction after abutting against the electrode group 100 and the depth dimension H of the current guiding structure 21 in the first direction is constant, and when the width dimension W of the flow dividing groove 212 in the direction perpendicular to the first direction is greater than the maximum value within the range of 2 mm ≤ W ≤ 5 mm, the liquid injection speed is faster and the time consumed for completing the liquid injection operation is shorter. However, due to the too large value of W, the insulating structural member 2 will increase the overall width dimension in order to avoid a reduction in structural strength, resulting in an increase in manufacturing cost.

[0071] Optionally, as Figure 3 shown, the insulating structural member 2 further is provided with at least one reinforcing rib 221 in the through hole 22, and the at least one reinforcing rib 221 is used for dividing the through hole 22 into a plurality of flow dividing holes 222. By arranging the reinforcing rib 221 in the through hole 22, the insulating structural member 2 supports the through hole 22, so that even if the insulating structural member 2 deforms due to compression, the aperture of the through hole 22 will not be significantly reduced, thereby ensuring that the flow rate of the electrolyte through the through hole 22 meets the requirements.

[0072] In this embodiment, the number and shape of the reinforcing ribs 221 provided by the insulating structural member 2 in the through hole 22 can be freely set according to requirements. In this embodiment, the insulating structural member 2 is provided with four rectangular reinforcing ribs 221 intersecting at the center of the through hole 22 in the through hole 22. At this time, the through hole 22 is divided into four fan-shaped flow dividing holes 222.

[0073] Optionally, the total area of the plurality of flow dividing holes 222 is S1, and the flow area of the liquid injection hole 11 is S2, and it satisfies 4 ≤ S1 / S2 ≤ 6. By limiting the ratio of the total area S1 of the plurality of flow dividing holes 222 to the flow area S2 of the liquid injection hole 11, so that the ratio of the two satisfies 4 ≤ S1 / S2 ≤ 6. Thus, on the one hand, it is ensured that the electrolyte will not delay the speed of the electrolyte infiltrating the electrode group 100 due to the too small total area of the plurality of flow dividing holes 222, and on the other hand, it is ensured that the insulating structural member 2 will not cause a decrease in the structural strength of the insulating structural member 2 due to the too large total area of the plurality of flow dividing holes 222, thereby affecting the fixing effect on the electrode group 100.

[0074] In this embodiment, in order to determine the influence of the ratio of the total area S1 of the plurality of flow dividing holes 222 and the flow area S2 of the liquid injection hole 11 on the rate of the electrolyte infiltrating the electrode group 100 and the fixing effect of the insulating structural member 2 on the electrode group 100, as shown in Table 3, four groups of embodiments and four groups of comparative examples are provided for verification.

[0075] Table 3

[0076]

[0077] In Example 8, the total area S1 of the plurality of flow diversion holes 222 is set to 16 mm², and the flow area S2 of the liquid injection hole 11 is set to 4 mm². At this time, the ratio between the total area S1 of the plurality of flow diversion holes 222 and the flow area S2 of the liquid injection hole 11, S1 / S2, is 4. Through experimental verification, the liquid injection time is 24 min, which meets the requirements of the liquid injection process.

[0078] In Example 9, the total area S1 of the plurality of flow diversion holes 222 is set to 18 mm², and the flow area S2 of the liquid injection hole 11 is set to 4 mm². At this time, the ratio between the total area S1 of the plurality of flow diversion holes 222 and the flow area S2 of the liquid injection hole 11, S1 / S2, is 4.5. Through experimental verification, the liquid injection time is 23.4 min, which meets the requirements of the liquid injection process.

[0079] In Example 10, the total area S1 of the plurality of flow diversion holes 222 is set to 20 mm², and the flow area S2 of the liquid injection hole 11 is set to 4 mm². At this time, the ratio between the total area S1 of the plurality of flow diversion holes 222 and the flow area S2 of the liquid injection hole 11, S1 / S2, is 5. Through experimental verification, the liquid injection time is 22.6 min, which meets the requirements of the liquid injection process.

[0080] In Example 11, the total area S1 of the plurality of flow diversion holes 222 is set to 24 mm², and the flow area S2 of the liquid injection hole 11 is set to 4 mm². At this time, the ratio between the total area S1 of the plurality of flow diversion holes 222 and the flow area S2 of the liquid injection hole 11, S1 / S2, is 6. Through experimental verification, the liquid injection time is 22 min, which meets the requirements of the liquid injection process.

[0081] It can be seen from Example 8 to Example 11 that when the ratio between the total area S1 of the plurality of flow diversion holes 222 and the flow area S2 of the liquid injection hole 11 satisfies the range of 4 ≤ S1 / S2 ≤ 6, the liquid injection time is less than the specified 25 min at this time, so it meets the requirements of the liquid injection process.

[0082] In Comparative Example 10, the total area S1 of the plurality of flow diversion holes 222 is set to 12 mm², and the flow area S2 of the liquid injection hole 11 is set to 4 mm². At this time, the ratio between the total area S1 of the plurality of flow diversion holes 222 and the flow area S2 of the liquid injection hole 11, S1 / S2, is 3. Through experimental verification, the liquid injection time is 27 min, which does not meet the requirements of the liquid injection process.

[0083] In Comparative Example 11, the total area S1 of the plurality of flow diversion holes 222 is set to 14 mm², and the flow area S2 of the liquid injection hole 11 is set to 4 mm². At this time, the ratio between the total area S1 of the plurality of flow diversion holes 222 and the flow area S2 of the liquid injection hole 11, S1 / S2, is 3.5. Through experimental verification, the liquid injection time is 26 min, which does not meet the requirements of the liquid injection process.

[0084] As can be seen from Comparative Example 10 to Comparative Example 11, when the ratio between the total area S1 of multiple shunt holes 222 and the flow area S2 of the liquid injection hole 11 is less than the minimum value of the range of 4 ≤ S1 / S2 ≤ 6, since the total area of the multiple shunt holes 222 is small, the flow rate difference between the flow rate of the electrolyte through the liquid injection hole 11 and the flow rate of the electrolyte through the multiple shunt holes 222 is large, resulting in the injection time being greater than the specified 25 min. Therefore, it does not meet the requirements of the injection process. And because the value of S1 / S2 in Comparative Example 11 is greater than the value of S1 / S2 in Comparative Example 10, the time consumed in Comparative Example 11 is less than the time consumed in Comparative Example 10.

[0085] In Comparative Example 12, the total area S1 of multiple shunt holes 222 is set to 26 mm², and the flow area S2 of the liquid injection hole 11 is set to 4 mm². At this time, the ratio between the total area S1 of multiple shunt holes 222 and the flow area S2 of the liquid injection hole 11, S1 / S2, is 6.5. After experimental verification, the injection time is 21.3 min, which meets the requirements of the injection process. However, due to the relatively large area of S1, the strength of the region where the insulating structure member 2 fixes the pole group 100 is low, and the fixing effect on the pole group 100 is poor.

[0086] In Comparative Example 13, the total area S1 of multiple shunt holes 222 is set to 28 mm², and the flow area S2 of the liquid injection hole 11 is set to 4 mm². At this time, the ratio between the total area S1 of multiple shunt holes 222 and the flow area S2 of the liquid injection hole 11, S1 / S2, is 7.0. After experimental verification, the injection time is 20.5 min, which meets the requirements of the injection process. However, due to the relatively large area of S1, the strength of the region where the insulating structure member 2 fixes the pole group 100 is low, and the fixing effect on the pole group 100 is poor.

[0087] As can be seen from Comparative Example 12 to Comparative Example 13, when the ratio between the total area S1 of multiple shunt holes 222 and the flow area S2 of the liquid injection hole 11 is greater than the maximum value of the range of 4 ≤ S1 / S2 ≤ 6, since the total area of the multiple shunt holes 222 is large, the flow rate of the electrolyte through the multiple shunt holes 222 is large. Although the injection time is greatly shortened and meets the requirements of the injection process, the large total area of the multiple shunt holes 222 causes the structural strength of the region where the insulating structure member 2 opens the multiple shunt holes 222 to be greatly reduced, so that the pole group 100 cannot be effectively fixed.

[0088] Optionally, as Figure 3As shown, the thickness dimension T of the reinforcing rib 221 in the first direction is T, and 0.7 mm ≤ T ≤ 1 mm is satisfied. By limiting the thickness dimension T of the reinforcing rib 221 in the first direction to satisfy 0.7 mm ≤ T ≤ 1 mm, on the one hand, it is avoided that the reinforcing rib 221 is too thin to resist the acting force when the insulating structure 2 deforms, resulting in the reduction of the total area of the plurality of flow dividing holes 222 and affecting the speed of the electrolyte to infiltrate the electrode group 100 through the insulating structure 2. On the other hand, it is avoided that the thickness of the reinforcing rib 221 is too large, resulting in too large a supporting force, reducing the compression deformation amount of the insulating structure 2 and causing assembly difficulties.

[0089] The thickness dimension T of the reinforcing rib 221 in the first direction can be any value or the range between any two values between 0.7 mm and 1 mm, such as 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 0.95 mm, 1 mm, etc.

[0090] Optionally, as Figure 3 As shown, the width dimension M of the reinforcing rib 221 in the direction perpendicular to the first direction is M, and 1.5 mm ≤ M ≤ 2 mm is satisfied. By limiting the width dimension M of the reinforcing rib 221 in the direction perpendicular to the first direction to satisfy 1.5 mm ≤ M ≤ 2 mm, on the one hand, it is avoided that the reinforcing rib 221 is too narrow to resist the acting force when the insulating structure 2 deforms, resulting in the reduction of the total area of the plurality of flow dividing holes 222 and affecting the speed of the electrolyte to infiltrate the electrode group 100 through the insulating structure 2. On the other hand, it is avoided that the reinforcing rib 221 is too wide, occupying too much area of the via holes 22, resulting in the reduction of the total area of the plurality of flow dividing holes 222 and affecting the speed of the electrolyte to infiltrate the electrode group 100 through the insulating structure 2.

[0091] The width dimension M of the reinforcing rib 221 in the direction perpendicular to the first direction can be any value or the range between any two values between 1.5 mm and 2 mm, such as 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, etc.

[0092] Optionally, as Figure 3As shown, the insulation structural member 2 includes a through-hole 24 passing through the insulation structural member 2 and abutting portions 25 located on both sides of the through-hole 24 along the second direction. The abutting portions 25 abut against the electrode group 100, and are respectively provided with a current guiding structure 21 and a through-hole 22 arranged in the current guiding structure 21. By providing the through-hole 24 passing through the insulation structural member 2 on the insulation structural member 2, it is convenient for the tab of the electrode group 100 to pass through the insulation structural member 2 and be connected to the pole column in the battery case. Moreover, by providing the current guiding structure 21 and the through-hole 22 arranged in the current guiding structure 21 on the abutting portions 25 on both sides of the through-hole 24 along the second direction, any one of the two sides of the insulation structural member 2 along the second direction can be communicated with the liquid injection hole 11 on the battery case during assembly, without specifically adjusting the assembly direction of the insulation structural member 2, thus improving the convenience of the assembly operation.

[0093] Optionally, as Figure 3 shown, each abutting portion 25 is provided with a plurality of uniformly distributed weakening structures 26, and the weakening structures 26 penetrate through the abutting portion 25. By providing a plurality of uniformly distributed weakening structures 26 on the abutting portion 25, while ensuring the fixing strength of the electrode group 100, the structural strength of the abutting portion 25 is reduced, making it easier to deform when stressed, and avoiding excessive strength of the abutting portion 25 from damaging the electrode group 100. Among them, the shape of the weakening structure 26 can be freely set according to requirements, such as a circular through-hole or a long-strip through-hole. In this embodiment, the weakening structure 26 is a circular through-hole.

[0094] In this embodiment, as Figure 4 shown, a battery is further provided. The battery includes an electrode group 100 and the above-mentioned battery case, and the electrode group 100 is accommodated in the battery case. By applying the above-mentioned battery case, the time for the electrolyte infiltration operation can be effectively shortened, the assembly rate is improved, and the production cycle is shortened.

[0095] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Battery housing, characterized in that, The battery housing includes a cover body, a housing body, and an insulating structural member. The housing body is a hollow shell structure with an opening. The cover body is disposed at the opening of the housing body to form a receiving cavity for accommodating the electrode group. A liquid injection hole is formed on the wall surface of the cover body or the housing body opposite to the tab of the electrode group. The insulating structural member is located in the receiving cavity and is disposed on one side of the electrode group where the tab extends; One side of the insulating structural member facing away from the cover body is recessed in a direction away from the electrode group to form a flow guiding structure. A through hole communicating with the liquid injection hole is further formed on the insulating structural member, and the through hole is disposed in the flow guiding structure; The compression amount of the insulating structural member compressed along a first direction after being in contact with the electrode group is A, and the depth dimension of the flow guiding structure along the first direction is H, and 0.4 ≤ A / H ≤ 0.5 is satisfied; The flow guiding structure includes a flow guiding sink and at least one flow dividing groove communicating with the flow guiding sink, and the through hole is disposed in the area surrounded by the flow guiding sink; The width dimension of the flow dividing groove along a direction perpendicular to the first direction is W, and 2mm ≤ W ≤ 5mm is satisfied.

2. The battery housing according to claim 1, characterized in that, At least one reinforcing rib is further disposed in the through hole of the insulating structural member, and at least one of the reinforcing ribs is used to divide the through hole into a plurality of flow dividing holes.

3. The battery housing according to claim 2, wherein, The total area of the plurality of flow dividing holes is S1, and the flow area of the liquid injection hole is S2, and 4 ≤ S1 / S2 ≤ 6 is satisfied.

4. The battery housing according to claim 2, wherein, The thickness dimension of the reinforcing rib along the first direction is T, and 0.7mm ≤ T ≤ 1mm is satisfied.

5. The battery housing according to claim 2, characterized in that, The width dimension of the reinforcing rib along a direction perpendicular to the first direction is M, and 1.5mm ≤ M ≤ 2mm is satisfied.

6. The battery housing according to claim 1, characterized in that, The insulating structural member includes a through hole penetrating through the insulating structural member and abutting portions located on both sides of the through hole along a second direction. The abutting portions are in contact with the electrode group, and the flow guiding structure and the through hole disposed in the flow guiding structure are respectively provided; 7. The battery housing according to claim 6, characterized in that, A plurality of uniformly distributed weakening structures are provided on each of the abutting portions, and the weakening structures penetrate through the abutting portions.

8. A battery, characterized in that, The battery includes an electrode group and the battery housing according to any one of claims 1-7, and the electrode group is accommodated in the battery housing.

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