Battery shell and battery

Abstract

The invention belongs to the technical field of batteries, and discloses a battery shell and a battery, the battery shell comprises a cover plate body, a shell body and a first insulating structural member, and a liquid injection hole is formed in the wall surface of the cover plate body or the shell body opposite to a tab; one side, opposite to the liquid injection hole, of the first insulating structural member is provided with a liquid injection structure composed of a diversion trench and an overflow trench which are communicated with each other, the diversion trench is provided with a diversion hole, the overflow trench is provided with an overflow hole, the depth size of the diversion trench is H1, the depth size of the overflow trench is H2, and H1 / H2 is greater than or equal to 1 and less than or equal to 3. When overflowing occurs in the liquid injection process, the overflowing electrolyte flows into the overflowing groove and flows out of the overflowing hole, so that smooth injection of the electrolyte is guaranteed, the relationship between the depth size H1 and the depth size H2 is limited, a height difference exists between the overflowing groove and the flow guide groove, the buffering effect is achieved, and the service life of the electrolyte is prolonged. And the impact of the electrolyte on the pole group is relieved.

Description

Technical Field

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

[0002] Lithium-ion batteries are currently widely used in various fields such as transportation power supply, electric energy storage power supply, new energy storage power supply, aerospace and military industry, etc. due to their large capacity, high operating voltage, strong charge retention ability, and long cycle life. The structure of a single lithium battery generally includes a pole group, an electrolyte, a cover plate, a shell, and internal and external insulation structures. The cover plate and the shell are usually fixed by laser welding to form a closed space with a certain structural strength to protect the pole group. The cover plate is generally integrated with functional areas such as poles, explosion-proof valves, and injection holes. The injection hole is usually set on the cover plate, and a through hole connected to the injection hole is opened on the inner insulating part to facilitate the inflow of electrolyte, so as to achieve the purpose of wetting the pole group.

[0003] The pole ear of the pole group is connected to the pole column inserted on the inner insulating part and is located on the inner side of the inner insulating part. During the injection process, the inside of the battery needs to be vacuumed. Therefore, the pole ear of the pole group is affected by the negative pressure inside the battery and will be tightly attached to the inner insulating part, causing the pole ear to block the through hole on the inner insulating part opposite to the injection hole, resulting in the flow rate of electrolyte injected through the injection hole being greater than the flow rate of electrolyte flowing out through the through hole, so that a part of the electrolyte cannot flow out in time, thereby causing overflow of the electrolyte, with a high risk of insulation failure and poor safety. Summary of the invention

[0004] The object of the present invention is to provide a battery casing and a battery with low risk of insulation failure and good safety.

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

[0006] On the one hand, a battery shell is provided, the battery shell comprising a cover plate body, a shell body and a first insulating structural member, the shell body is a hollow shell structure with an opening, the cover plate body is arranged at the opening of the shell body to form a receiving cavity for receiving a pole group, a liquid injection hole is opened on the wall surface of the cover plate body or the shell body opposite to the side where the pole group extends out of the pole ear, the first insulating structural member is located in the receiving cavity and is arranged on the side where the pole group extends out of the pole ear;

[0007] A liquid injection structure is provided on a side of the first insulating structural member opposite to the liquid injection hole, the liquid injection structure includes a guide groove and an overflow groove connected to each other, the projection of the guide groove on the wall surface of the cover plate body or the shell body along the first direction covers the liquid injection hole, and a guide hole penetrating the guide groove is provided, and an overflow hole penetrating the overflow groove is provided on the overflow groove;

[0008] A depth dimension of the guide groove along the first direction is H1, a depth dimension of the overflow groove along the first direction is H2, and 1≤H1 / H2≤3 is satisfied.

[0009] Optionally, a buffer slope is provided between the guide groove and the overflow groove, and a length dimension of the buffer slope along the second direction is L1, and satisfies 2mm≤L1≤10mm.

[0010] Optionally, an angle between the buffer slope and an extension surface of the guide groove bottom surface extending toward the overflow groove is θ, and satisfies 15°≤θ≤70°.

[0011] Optionally, a plurality of guide holes are provided on the guide groove, the total effective cross-sectional area of ​​the plurality of guide holes is S1, the projection area of ​​the guide groove on the wall of the cover body or the shell body along the first direction is S2, and 0.25≤S1 / S2≤0.6 is satisfied.

[0012] Optionally, a total effective cross-sectional area of ​​the injection holes for the electrolyte to flow is S, and satisfies 0.8≤S1 / S≤1.2.

[0013] Optionally, the overflow groove is provided with a plurality of overflow holes, the total effective cross-sectional area of ​​the plurality of overflow holes is S3, the projection area of ​​the overflow groove along the first direction on the wall surface of the cover body or the shell body is S4, and 0.25≤S3 / S4≤0.6 is satisfied.

[0014] Optionally, the total effective cross-sectional area of ​​the injection hole is S, and satisfies 0.6≤S3 / S≤1.

[0015] Optionally, a distance dimension along the second direction between a boundary of one of the overflow holes closest to the electrode tab and the electrode tab is L2, and L2≥1 mm.

[0016] Optionally, the first insulating structural component is a plastic component integrally formed by an injection molding process.

[0017] On the other hand, a battery is provided, comprising a pole group and a battery casing as described in any one of the above items, wherein the pole group is accommodated in the battery casing.

[0018] Beneficial effects of the present invention:

[0019] The present invention provides a battery housing, which has a liquid injection structure consisting of a guide groove and an overflow groove connected to each other, and a guide hole is provided in the guide groove, and an overflow hole is provided in the overflow groove, so that when an electrolyte is injected, even if the pole ear of the electrode group blocks the guide hole in the guide groove due to the influence of negative pressure and causes overflow, the overflowed electrolyte will flow into the overflow groove connected to the guide groove and flow out from the overflow hole, thereby ensuring smooth injection of the electrolyte, and the depth dimension H1 of the guide groove along the first direction and the depth dimension H2 of the overflow groove along the first direction are controlled. The relationship between H1 and H2 is limited to satisfy 1≤H1 / H2≤3, so that there is a height difference between the overflow groove and the guide groove, so that when the overflowing electrolyte enters the overflow groove, it will overcome gravity, thereby losing its own energy, so that the energy of the electrolyte flowing out through the overflow hole is relatively low, thereby effectively alleviating the impact of the electrolyte on the electrode group when it flows out, which not only reduces the risk of insulation failure caused by electrolyte overflow, has higher safety, but also effectively alleviates the impact of the electrolyte on the electrode group when it flows out, improves the protection of the electrode group, and improves product quality.

[0020] The present invention also provides a battery, which, by applying the above-mentioned battery casing, not only has a lower risk of insulation failure, thereby improving the safety of use, but also improves the product quality by reducing the damage to the electrode group during the manufacturing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural exploded view of the cover body side of the battery housing provided by the present invention;

[0022] Figure 2 It is a structural cross-sectional view of the cover plate body side of the battery housing provided by the present invention;

[0023] Figure 3 It is a schematic structural diagram of the first insulating structural member in the battery housing provided by the present invention.

[0024] In the figure:

[0025] 100, ear;

[0026] 1. Cover plate body; 11. Liquid injection hole;

[0027] 2. First insulating structural member; 21. Liquid injection structure; 211. Guide groove; 212. Overflow groove; 213. Guide hole; 214. Overflow hole; 215. Buffer slope; 22. Pole through hole;

[0028] 3. Pole;

[0029] 4. Riveting block;

[0030] 5. A second insulating structural member;

[0031] 6. Sealing ring. DETAILED DESCRIPTION

[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0033] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0036] Therefore, in order to reduce the risk of insulation failure caused by electrolyte overflow and improve the safety of the structure, the present embodiment provides a battery casing, wherein for the convenience of describing the structural orientation, the thickness direction is defined as the first direction and the length direction is defined as the second direction.

[0037] like Figures 1 to 3As shown, the battery shell includes a cover body 1, a shell body and a first insulating structural member 2. The shell body is a hollow shell structure with an opening. The cover body 1 is arranged at the opening of the shell body to form a receiving cavity for receiving the electrode group. A liquid injection hole 11 is provided on the wall of the cover body 1 or the shell body opposite to the side where the electrode group extends out of the electrode ear 100. The first insulating structural member 2 is located in the receiving cavity and is arranged on the side where the electrode group extends out of the electrode ear 100. The liquid injection structure 21 includes a guide groove 211 and an overflow groove 212 connected to each other. The projection of the guide groove 211 on the cover body 1 or the wall of the shell body along the first direction covers the liquid injection hole 11, and a guide hole 213 penetrating the guide groove 211 is provided. An overflow hole 214 penetrating the overflow groove 212 is provided on the overflow groove 212. The depth dimension of the guide groove 211 along the first direction is H1, and the depth dimension of the overflow groove 212 along the first direction is H2, and 1≤H1 / H2≤3 is satisfied.

[0038] By providing a liquid injection structure 21 composed of a guide groove 211 and an overflow groove 212 connected to each other on the first insulating structure 2, and providing a guide hole 213 in the guide groove 211, and providing an overflow hole 214 in the overflow groove 212, when the electrolyte is injected, even if the electrode ear 100 of the electrode group blocks the guide hole 213 in the guide groove 211 due to the influence of negative pressure, causing overflow, the overflowed electrolyte will flow into the overflow groove 212 connected to the guide groove 211, and flow out from the overflow hole 214, thereby ensuring smooth injection of the electrolyte, and the depth dimension H1 of the guide groove 211 along the first direction and the overflow groove 212 are controlled. The relationship between the depth dimension H2 along the first direction is limited to satisfy 1≤H1 / H2≤3, so that there is a height difference between the overflow groove 212 and the guide groove 211, so that when the overflowing electrolyte enters the overflow groove 212, it will overcome gravity, thereby losing its own energy, so that the energy of the electrolyte flowing out through the overflow hole 214 is relatively low, thereby effectively alleviating the impact of the electrolyte on the electrode group when it flows out, so that it not only reduces the risk of insulation failure caused by electrolyte overflow, has higher safety, but also effectively alleviates the impact of the electrolyte on the electrode group when it flows out, improves the protection of the electrode group, and improves product quality.

[0039] The injection hole 11 can be provided at different positions according to the structural design. When the side of the electrode group extending from the electrode tab 100 is opposite to the cover body 1, the injection hole 11 is provided on the cover body 1. When the side of the electrode group extending from the electrode tab 100 is opposite to a wall of the shell body, the injection hole 11 is provided on the wall of the shell body opposite to the electrode tab 100. In this embodiment, the injection hole 11 is provided on the cover body 1. And the battery shell can be applied to different types of batteries, such as blade batteries or square shell batteries or large cylindrical batteries, etc. In the present embodiment, the battery shell is applied to square shell batteries, and in addition to the cover body 1 and the first insulating structure 2, the battery shell is also provided with a pole 3, a rivet block 4, a second insulating structure 5 and a sealing ring 6, wherein the second insulating structure 5 is arranged on the side of the cover body 1 away from the first insulating structure 2, and the rivet block 4 is arranged on the side of the second insulating structure 5 away from the cover body 1. The pole 3 passes through the first insulating structure 2, the cover body 1 and the second insulating structure 5 and is riveted with the rivet block 4 in sequence, and the sealing ring 6 is sleeved on the pole 3 to seal the gap between the pole 3 and the cover body 1 to prevent leakage of the electrolyte. Therefore, in order to facilitate the pole 3 to pass through the first insulating structure 2, a pole through hole 22 is also provided on the first insulating structure 2.

[0040] Alternatively, if Figure 2 As shown, a buffer slope 215 is provided between the guide groove 211 and the overflow groove 212 , and the length dimension of the buffer slope 215 along the second direction is L1 and satisfies 2mm≤L1≤10mm.

[0041] By setting the length dimension of the buffer slope 215 along the second direction to L1, on the basis of the height difference between the guide groove 211 and the overflow groove 212, there is also a certain lateral interval between the guide groove 211 and the overflow groove 212 along the second direction, thereby further improving the ability to consume the energy carried by the electrolyte itself and further enhancing the buffering effect of the electrolyte. In addition, by limiting the length dimension L1 of the buffer slope 215 along the second direction to satisfy 2mm≤L1≤10mm, on the one hand, it is avoided that the length dimension of the buffer slope 215 along the second direction is too small, resulting in the overflow electrolyte flowing from the guide groove 211 to the overflow groove 212. The path along the second direction is too short, thereby reducing the buffering effect of the overflow electrolyte. On the other hand, it is avoided that the length dimension of the buffer slope 215 along the second direction is too large, resulting in the overflow electrolyte flowing from the guide groove 211. The path along the second direction is too long, thereby consuming a long time and reducing efficiency.

[0042] In this embodiment, the length dimension L1 of the buffer slope 215 along the second direction can be any value between 2 mm and 10 mm or a range between any two values, such as 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, etc.

[0043] Among them, in order to verify the effect of the ratio of the depth dimension H1 of the guide groove 211 along the first direction to the depth dimension H2 of the overflow groove 212 along the first direction and the length dimension L1 of the buffer slope 215 along the second direction on electrolyte buffering during liquid injection, and the effect of the overflow groove 212 connected to the guide groove 211 on overflow during liquid injection, as shown in Table 1, eight groups of embodiments and six groups of comparative examples are provided for verification, and whether seepage occurs during liquid injection is observed, and after the liquid injection is completed, X-ray detection is used to determine whether the electrode group is damaged.

[0044] Table 1

[0045]

[0046] In Example 1, the ratio (H1 / H2) between the depth dimension H1 of the guide groove 211 along the first direction and the depth dimension H2 of the overflow groove 212 along the first direction is set to 1, and the length dimension L1 of the buffer slope 215 along the second direction is set to 2 mm. It has been verified through experiments that the pole group is not damaged, no leakage is found, and the required time of the injection process is not exceeded.

[0047] In Example 2, the ratio (H1 / H2) between the depth dimension H1 of the guide groove 211 along the first direction and the depth dimension H2 of the overflow groove 212 along the first direction is set to 3, and the length dimension L1 of the buffer slope 215 along the second direction is set to 2 mm. It has been verified through experiments that the pole group is not damaged, no leakage is found, and the required time of the injection process is not exceeded.

[0048] In Example 3, the ratio (H1 / H2) between the depth dimension H1 of the guide groove 211 along the first direction and the depth dimension H2 of the overflow groove 212 along the first direction is set to 1, and the length dimension L1 of the buffer slope 215 along the second direction is set to 4 mm. It has been verified through experiments that the pole group is not damaged, no leakage is found, and the required time of the injection process is not exceeded.

[0049] In Example 4, the ratio (H1 / H2) between the depth dimension H1 of the guide groove 211 along the first direction and the depth dimension H2 of the overflow groove 212 along the first direction is set to 3, and the length dimension L1 of the buffer slope 215 along the second direction is set to 4 mm. It has been verified through experiments that the pole group is not damaged, no leakage is found, and the required time of the injection process is not exceeded.

[0050] In Example 5, the ratio (H1 / H2) between the depth dimension H1 of the guide groove 211 along the first direction and the depth dimension H2 of the overflow groove 212 along the first direction is set to 1, and the length dimension L1 of the buffer slope 215 along the second direction is set to 6 mm. It has been verified through experiments that the pole group is not damaged, no leakage is found, and the required time of the injection process is not exceeded.

[0051] In Example 6, the ratio (H1 / H2) between the depth dimension H1 of the guide groove 211 along the first direction and the depth dimension H2 of the overflow groove 212 along the first direction is set to 3, and the length dimension L1 of the buffer slope 215 along the second direction is set to 6 mm. It has been verified through experiments that the pole group is not damaged, no leakage is found, and the required time of the injection process is not exceeded.

[0052] In Example 7, the ratio (H1 / H2) between the depth dimension H1 of the guide groove 211 along the first direction and the depth dimension H2 of the overflow groove 212 along the first direction is set to 1, and the length dimension L1 of the buffer slope 215 along the second direction is set to 10 mm. It has been verified through experiments that the pole group is not damaged, no leakage is found, and the required time of the injection process is not exceeded.

[0053] In Example 8, the ratio (H1 / H2) between the depth dimension H1 of the guide groove 211 along the first direction and the depth dimension H2 of the overflow groove 212 along the first direction is set to 3, and the length dimension L1 of the buffer slope 215 along the second direction is set to 10 mm. It has been verified through experiments that the pole group is not damaged, no leakage is found, and the required time of the injection process is not exceeded.

[0054] It can be seen from Examples 1 to 8 that when the ratio (H1 / H2) between the depth dimension H1 of the guide groove 211 along the first direction and the depth dimension H2 of the overflow groove 212 along the first direction meets the range of 1≤H1 / H2≤3, and the length dimension L1 of the buffer slope 215 along the second direction meets the range of 2mm≤L1≤10mm, it can be seen after observation and X-ray detection that the pole group was not damaged during the injection process, no seepage was found during the injection, and the time required by the injection process was not exceeded.

[0055] In comparative example 1, the ratio (H1 / H2) between the depth dimension H1 of the guide groove 211 along the first direction and the depth dimension H2 of the overflow groove 212 along the first direction is set to 0.5, and the length dimension L1 of the buffer slope 215 along the second direction is set to 4 mm. It is verified by experiments that the pole group has significant damage, no seepage is found, and the required time of the injection process is not exceeded.

[0056] In Comparative Example 2, the ratio (H1 / H2) between the depth dimension H1 of the guide groove 211 along the first direction and the depth dimension H2 of the overflow groove 212 along the first direction is set to 0.7, and the length dimension L1 of the buffer slope 215 along the second direction is set to 4 mm. It is verified by experiments that the pole group has significant damage, no seepage is found, and the required time of the injection process is not exceeded.

[0057] It can be seen from Comparative Examples 1 to 2 that when the ratio (H1 / H2) between the depth dimension H1 of the guide groove 211 along the first direction and the depth dimension H2 of the overflow groove 212 along the first direction is less than the minimum value in the range of 1≤H1 / H2≤3, even if the length dimension L1 of the buffer slope 215 along the second direction meets the range of 2mm≤L1≤10mm, but because the bottom height of the overflow groove 212 is located below the bottom surface of the guide groove 211 at this time, it has almost no buffering effect on the electrolyte, resulting in the electrolyte still having a large amount of energy after flowing out of the overflow hole 214, thereby causing an impact on the electrode group when flowing out, causing greater damage to the electrode group.

[0058] In comparative example 3, the ratio (H1 / H2) between the depth dimension H1 of the guide groove 211 along the first direction and the depth dimension H2 of the overflow groove 212 along the first direction is set to 3.5, and the length dimension L1 of the buffer slope 215 along the second direction is set to 4 mm. It is verified by experiments that the pole group is not damaged and no leakage is found, but the time required for the injection process is exceeded.

[0059] In comparative example 4, the ratio (H1 / H2) between the depth dimension H1 of the guide groove 211 along the first direction and the depth dimension H2 of the overflow groove 212 along the first direction is set to 4, and the length dimension L1 of the buffer slope 215 along the second direction is set to 4 mm. It is verified by experiments that the pole group is not damaged and no leakage is found, but the time required for the injection process is exceeded.

[0060] It can be seen from Comparative Examples 3 to 4 that when the ratio (H1 / H2) between the depth dimension H1 of the guide groove 211 along the first direction and the depth dimension H2 of the overflow groove 212 along the first direction is greater than the maximum value in the range of 1≤H1 / H2≤3, even if the length dimension L1 of the buffer slope 215 along the second direction meets the range of 2mm≤L1≤10mm, due to the excessive height difference between the guide groove 211 and the overflow groove 212 along the first direction, it is difficult for the electrolyte to enter the overflow groove 212 from the guide groove 211, resulting in a longer time for the electrolyte to enter the overflow groove 212 from the guide groove 211, thereby causing the injection time to exceed the requirements specified by the injection process.

[0061] In comparative example 5, the ratio (H1 / H2) between the depth dimension H1 of the guide groove 211 along the first direction and the depth dimension H2 of the overflow groove 212 along the first direction is set to 2, and the length dimension L1 of the buffer slope 215 along the second direction is set to 12 mm. It is verified by experiments that the pole group is not damaged and no leakage is found, but the time required for the injection process is exceeded.

[0062] It can be seen from Comparative Example 5 that when the ratio (H1 / H2) between the depth dimension H1 of the guide groove 211 along the first direction and the depth dimension H2 of the overflow groove 212 along the first direction meets the range of 1≤H1 / H2≤3, but the length dimension L1 of the buffer slope 215 along the second direction is greater than the maximum value in the range of 2mm≤L1≤10mm, at this time, due to the long distance between the overflow groove 212 and the guide groove 211 along the second direction, the path of the electrolyte flow is extended, which results in more time being consumed, resulting in the injection time exceeding the time required by the injection process, but the extension of the path improves the buffering effect of the overflow electrolyte, thereby avoiding the impact on the electrode group.

[0063] In comparative example 6, the ratio (H1 / H2) between the depth dimension H1 of the guide groove 211 along the first direction and the depth dimension H2 of the overflow groove 212 along the first direction is set to 2, and the length dimension L1 of the buffer slope 215 along the second direction is set to 1 mm. It is verified by experiments that the pole group has slight damage, no seepage is found, and the required time of the injection process is not exceeded.

[0064] It can be seen from Comparative Example 6 that when the ratio (H1 / H2) between the depth dimension H1 of the guide groove 211 along the first direction and the depth dimension H2 of the overflow groove 212 along the first direction meets the range of 1≤H1 / H2≤3, but the length dimension L1 of the buffer slope 215 along the second direction is less than the minimum value in the range of 2mm≤L1≤10mm, at this time, since the distance between the overflow groove 212 and the guide groove 211 along the second direction is close, the buffering capacity of the electrolyte is reduced, resulting in slight damage to the electrode group. Although it is still within the qualified range, the product quality is reduced compared with the undamaged electrode group. However, since the distance between the overflow groove 212 and the guide groove 211 along the second direction is close, the electrolyte flow path is shortened, thereby reducing the time required for injection and avoiding the problem of injection timeout.

[0065] Optionally, the angle between the buffer slope 215 and the extension surface extending from the bottom surface of the guide groove 211 to the overflow groove 212 is θ, and satisfies 15°≤θ≤70°. By setting the angle θ between the buffer slope 215 and the extension surface extending from the bottom surface of the guide groove 211 to the overflow groove 212, the inclination of the buffer slope 215 is determined. On the one hand, it is avoided that the angle θ is too small, resulting in a gentle slope of the buffer slope 215, reducing the buffering effect of the electrolyte, and on the other hand, it is avoided that the angle θ is too large, resulting in a large slope of the buffer slope 215, thereby increasing the difficulty of the electrolyte overflowing from the guide groove 211 to the overflow groove 212 and increasing the injection time.

[0066] In this embodiment, the angle θ between the buffer slope 215 and the extended surface extending from the bottom surface of the guide groove 211 toward the overflow groove 212 can be any value between 15° and 70° or a range between any two values, for example, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70°, etc.

[0067] In this embodiment, in order to determine the effect of the angle θ between the buffer slope 215 and the extended surface extending from the bottom surface of the guide groove 211 toward the overflow groove 212 on electrolyte buffering during liquid injection, and the effect of the overflow groove 212 connected to the guide groove 211 on overflow during liquid injection, as shown in Table 2, eight groups of embodiments and four groups of comparative examples are provided for verification, and whether seepage occurs during liquid injection is observed, and after the liquid injection is completed, X-ray detection is used to determine whether the electrode group is damaged.

[0068] Table 2

[0069]

[0070] In Example 9, the length dimension L1 of the buffer slope 215 along the second direction is set to 2 mm, and the angle θ between the buffer slope 215 and the extension surface extending from the bottom surface of the guide groove 211 toward the overflow groove 212 is set to 15°. It has been verified through experiments that the electrode group is not damaged, no leakage is found, and the required time of the injection process is not exceeded.

[0071] In Example 10, the length dimension L1 of the buffer slope 215 along the second direction is set to 10 mm, and the angle θ between the buffer slope 215 and the extension surface extending from the bottom surface of the guide groove 211 toward the overflow groove 212 is set to 15°. It has been verified through experiments that the electrode group is not damaged, no leakage is found, and the required time of the injection process is not exceeded.

[0072] In Example 11, the length dimension L1 of the buffer slope 215 along the second direction is set to 2 mm, and the angle θ between the buffer slope 215 and the extension surface extending from the bottom surface of the guide groove 211 toward the overflow groove 212 is set to 45°. It has been verified through experiments that the electrode group is not damaged, no leakage is found, and the required time of the injection process is not exceeded.

[0073] In Example 12, the length dimension L1 of the buffer slope 215 along the second direction is set to 10 mm, and the angle θ between the buffer slope 215 and the extension surface extending from the bottom surface of the guide groove 211 toward the overflow groove 212 is set to 45°. It has been verified through experiments that the electrode group is not damaged, no leakage is found, and the required time of the injection process is not exceeded.

[0074] In Example 13, the length dimension L1 of the buffer slope 215 along the second direction is set to 4 mm, and the angle θ between the buffer slope 215 and the extension surface extending from the bottom surface of the guide groove 211 toward the overflow groove 212 is set to 45°. It has been verified through experiments that the electrode group is not damaged, no leakage is found, and the required time of the injection process is not exceeded.

[0075] In Example 14, the length dimension L1 of the buffer slope 215 along the second direction is set to 4 mm, and the angle θ between the buffer slope 215 and the extension surface extending from the bottom surface of the guide groove 211 toward the overflow groove 212 is set to 60°. It has been verified through experiments that the electrode group is not damaged, no leakage is found, and the required time of the injection process is not exceeded.

[0076] In Example 15, the length dimension L1 of the buffer slope 215 along the second direction is set to 2 mm, and the angle θ between the buffer slope 215 and the extension surface extending from the bottom surface of the guide groove 211 toward the overflow groove 212 is set to 15°. It has been verified through experiments that the electrode group is not damaged, no leakage is found, and the required time of the injection process is not exceeded.

[0077] In Example 16, the length dimension L1 of the buffer slope 215 along the second direction is set to 10 mm, and the angle θ between the buffer slope 215 and the extension surface extending from the bottom surface of the guide groove 211 toward the overflow groove 212 is set to 75°. It has been verified through experiments that the electrode group is not damaged, no leakage is found, and the required time of the injection process is not exceeded.

[0078] It can be seen from Examples 9 to 16 that, under the premise of ensuring that the length dimension L1 of the buffer slope 215 along the second direction meets the requirements, different values ​​are taken for the angle θ between the buffer slope 215 and the extended surface extending from the bottom surface of the guide groove 211 toward the overflow groove 212. When the values ​​of the angle θ all satisfy 15°≤θ≤70°, it can be ensured that the inclination of the buffer slope 215 meets the requirements, which can not only play a buffering effect on the electrolyte and avoid damage to the electrode group, but also avoid the electrolyte outflow taking a long time, which exceeds the time requirement of the injection process.

[0079] In comparative example 7, the length dimension L1 of the buffer slope 215 along the second direction is set to 2 mm, and the angle θ between the buffer slope 215 and the extension surface extending from the bottom surface of the guide groove 211 toward the overflow groove 212 is set to 10°. It is verified by experiments that the pole group is slightly damaged, no leakage is found, and the required time of the injection process is not exceeded.

[0080] In comparative example 8, the length dimension L1 of the buffer slope 215 along the second direction is set to 6 mm, and the angle θ between the buffer slope 215 and the extension surface extending from the bottom surface of the guide groove 211 toward the overflow groove 212 is set to 10°. It is verified by experiments that the pole group is slightly damaged, no leakage is found, and the required time of the injection process is not exceeded.

[0081] It can be seen from Comparative Examples 7 to 8 that, under the premise of ensuring that the length dimension L1 of the buffer slope 215 along the second direction meets the requirements, different values ​​are taken for the angle θ between the buffer slope 215 and the extended surface extending from the bottom surface of the guide groove 211 toward the overflow groove 212. When the value of the angle θ is less than the minimum value in the range of 15°≤θ≤70°, the inclination of the buffer slope 215 is small and the slope is gentle, thereby reducing the difficulty of the electrolyte flowing from the guide groove 211 into the overflow groove 212 and weakening the buffering effect of the electrolyte, resulting in slight damage to the electrode group.

[0082] In comparative example 9, the length dimension L1 of the buffer slope 215 along the second direction is set to 2 mm, and the angle θ between the buffer slope 215 and the extension surface extending from the bottom surface of the guide groove 211 toward the overflow groove 212 is set to 80°. It is verified by experiments that the electrode group is not damaged and no leakage is found, but the time required by the injection process is exceeded.

[0083] In comparative example 10, the length dimension L1 of the buffer slope 215 along the second direction is set to 6 mm, and the angle θ between the buffer slope 215 and the extension surface extending from the bottom surface of the guide groove 211 toward the overflow groove 212 is set to 80°. It is verified by experiments that the electrode group is not damaged and no leakage is found, but the time required by the injection process is exceeded.

[0084] It can be seen from Comparative Examples 9 and 10 that, under the premise of ensuring that the length dimension L1 of the buffer slope 215 along the second direction meets the requirements, different values ​​of the angle θ between the buffer slope 215 and the extended surface extending from the bottom surface of the guide groove 211 toward the overflow groove 212 are taken. When the value of the angle θ is greater than the maximum value in the range of 15°≤θ≤70°, the inclination of the buffer slope 215 is greater and the slope is steeper, thereby increasing the difficulty of the electrolyte flowing from the guide groove 211 into the overflow groove 212, and extending the time for the electrolyte to flow from the guide groove 211 into the overflow groove 212, thereby exceeding the time required by the injection process, extending the production cycle, and reducing production efficiency.

[0085] Alternatively, if Figure 2 , Figure 3 As shown, a plurality of guide holes 213 are provided on the guide groove 211, the total effective cross-sectional area of ​​the plurality of guide holes 213 is S1, the projection area of ​​the guide groove 211 on the wall of the cover body 1 or the shell body along the first direction is S2, and 0.25≤S1 / S2≤0.6 is satisfied. By setting the total effective cross-sectional area of ​​the plurality of guide holes 213 to S1, the projection area of ​​the guide groove 211 on the cover body 1 or the wall of the shell body along the first direction to S2, and limiting the ratio between the total effective cross-sectional area S1 of the plurality of guide holes 213 and the projection area S2 of the guide groove 211 on the cover body 1 along the first direction, so that the ratio of the two satisfies 0.25≤S1 / S2≤0.6, on the one hand, it is prevented that the total effective cross-sectional area S1 of the plurality of guide holes 213 is too small, thereby reducing the speed of the electrolyte flowing out of the guide holes 213, and on the other hand, it is prevented that the total effective cross-sectional area S1 of the plurality of guide holes 213 is too large, thereby reducing the structural strength of the first insulating structure 2 at the guide groove 211, so that when the electrolyte accumulates in the guide groove 211, the first insulating structure 2 is deformed at the guide groove 211.

[0086] In this embodiment, the guide hole 213 is a circular through hole with a hole diameter of d1. The guide groove 211 is provided with a number N1 of guide holes 213. Therefore, the total effective cross-sectional area S1 of the plurality of guide holes 213 is equal to (d1 / 2). 2 ·π·N1.

[0087] Alternatively, if Figure 2 , Figure 3 As shown, the total effective cross-sectional area of ​​the injection hole 11 is S, and satisfies 0.8≤S1 / S≤1.2. By setting the total effective cross-sectional area of ​​the injection hole 11 to S, and limiting the ratio between the total effective cross-sectional area S1 of the plurality of guide holes 213 and the total effective cross-sectional area S of the injection hole 11, so that the ratio of the two satisfies 0.8≤S1 / S≤1.2, on the one hand, it is prevented that the total effective cross-sectional area S1 of the plurality of guide holes 213 accounts for too small a proportion, thereby reducing the speed at which the electrolyte flows out of the guide holes 213, and on the other hand, it is prevented that the total effective cross-sectional area S1 of the plurality of guide holes 213 accounts for too large a proportion, thereby causing the electrolyte to flow out of the guide holes 213 and produce a greater impact on the electrode group, thereby causing damage to the electrode group.

[0088] In this embodiment, the injection hole 11 is a circular through hole with a hole diameter of d2, so the effective cross-sectional area S of the injection hole 11 is (d2 / 2) 2 ·π.

[0089] Alternatively, if Figure 2 , Figure 3As shown, the overflow groove 212 is provided with a plurality of overflow holes 214, the total effective cross-sectional area of ​​the plurality of overflow holes 214 is S3, the projection area of ​​the overflow groove 212 on the wall of the cover body 1 or the shell body along the first direction is S4, and 0.25≤S3 / S4≤0.6 is satisfied. By setting the total effective cross-sectional area of ​​the plurality of overflow holes 214 to S3, the projected area of ​​the overflow groove 212 on the cover body 1 or the wall of the shell body along the first direction to S4, and limiting the ratio of the total effective cross-sectional area S3 of the plurality of overflow holes 214 to the projected area S4 of the overflow groove 212 on the cover body 1 along the first direction, so that the ratio satisfies 0.25≤S3 / S4≤0.6, on the one hand, it is prevented that the total effective cross-sectional area S3 of the plurality of overflow holes 214 is too small, thereby reducing the speed at which the electrolyte flows out of the overflow holes 214, and on the other hand, it is prevented that the total effective cross-sectional area S3 of the plurality of overflow holes 214 is too large, thereby reducing the structural strength of the first insulating structure 2 at the overflow groove 212, so that when the electrolyte accumulates in the overflow groove 212, the first insulating structure 2 is deformed at the overflow groove 212.

[0090] In this embodiment, the overflow hole 214 is a circular through hole with a hole diameter of d3. The overflow hole 214 is provided in the overflow groove 212 in a number N2. Therefore, the total effective cross-sectional area of ​​the plurality of overflow holes 214 is S3=(d3 / 2). 2 ·π·N2.

[0091] Alternatively, if Figure 2 , Figure 3 As shown, the total effective cross-sectional area of ​​the injection hole 11 is S, and satisfies 0.6≤S3 / S≤1. By setting the total effective cross-sectional area of ​​the injection hole 11 to S, and limiting the ratio between the total effective cross-sectional area S3 of the plurality of overflow holes 214 and the total effective cross-sectional area S of the injection hole 11, so that the ratio of the two satisfies 0.6≤S3 / S≤1, on the one hand, it is prevented that the total effective cross-sectional area S3 of the plurality of overflow holes 214 accounts for too small a proportion, thereby reducing the speed at which the electrolyte flows out of the overflow holes 214, and on the other hand, it is prevented that the total effective cross-sectional area S3 of the plurality of overflow holes 214 accounts for too large a proportion, thereby causing the electrolyte to flow out of the overflow holes 214 and produce a greater impact on the electrode group, thereby causing damage to the electrode group.

[0092] In this embodiment, the injection hole 11 is a circular through hole with a hole diameter of d2, so the effective cross-sectional area S of the injection hole 11 is (d2 / 2) 2 ·π.

[0093] In this embodiment, in order to verify the ratio S1 / S2 between the total effective cross-sectional area S1 of the plurality of guide holes 213 and the projection area S2 of the guide groove 211 on the wall of the cover body 1 or the shell body along the first direction, the ratio S1 / S between the total effective cross-sectional area S1 of the plurality of guide holes 213 and the total effective cross-sectional area S of the injection hole 11, the total effective cross-sectional area S3 of the plurality of overflow holes 214 and the projection area S4 of the overflow groove 212 on the wall of the cover body 1 or the shell body along the first direction, The ratio S3 / S4 and the ratio S3 / S between the total effective cross-sectional area S3 of the plurality of overflow holes 214 and the total effective cross-sectional area S of the injection hole 11, have an effect on electrolyte buffering during injection, and the effect of the overflow groove 212 connected to the guide groove 211 on overflow during injection, as shown in Table 3. Eight groups of embodiments and six groups of comparative examples are provided for verification, and whether seepage occurs during injection is observed. After the injection is completed, X-ray detection is used to determine whether the electrode group is damaged.

[0094] Table 3

[0095]

[0096] In Example 17, the ratio S1 / S2 between the total effective cross-sectional area S1 of the plurality of guide holes 213 and the projected area S2 of the guide groove 211 on the wall of the cover body 1 or the shell body along the first direction is set to 0.25, the ratio S1 / S between the total effective cross-sectional area S1 of the plurality of guide holes 213 and the total effective cross-sectional area S of the injection hole 11 is set to 0.8, the ratio S3 / S4 between the total effective cross-sectional area S3 of the plurality of overflow holes 214 and the projected area S4 of the overflow groove 212 on the wall of the cover body 1 or the shell body along the first direction is set to 0.25, and the ratio S3 / S between the total effective cross-sectional area S3 of the plurality of overflow holes 214 and the total effective cross-sectional area S of the injection hole 11 is set to 0.6. After experimental verification, no damage was found in the electrode group, and no leakage was found.

[0097] In Example 18, the ratio S1 / S2 between the total effective cross-sectional area S1 of the plurality of guide holes 213 and the projected area S2 of the guide groove 211 on the wall of the cover body 1 or the shell body along the first direction is set to 0.4, the ratio S1 / S between the total effective cross-sectional area S1 of the plurality of guide holes 213 and the total effective cross-sectional area S of the injection hole 11 is set to 1, the ratio S3 / S4 between the total effective cross-sectional area S3 of the plurality of overflow holes 214 and the projected area S4 of the overflow groove 212 on the wall of the cover body 1 or the shell body along the first direction is set to 0.4, and the ratio S3 / S between the total effective cross-sectional area S3 of the plurality of overflow holes 214 and the total effective cross-sectional area S of the injection hole 11 is set to 0.8. After experimental verification, no damage was found in the electrode group, and no leakage was found.

[0098] In Example 19, the ratio S1 / S2 between the total effective cross-sectional area S1 of the plurality of guide holes 213 and the projected area S2 of the guide groove 211 on the cover body 1 or the shell body wall along the first direction is set to 0.6, the ratio S1 / S between the total effective cross-sectional area S1 of the plurality of guide holes 213 and the total effective cross-sectional area S of the injection hole 11 is set to 0.9, the ratio S3 / S4 between the total effective cross-sectional area S3 of the plurality of overflow holes 214 and the projected area S4 of the overflow groove 212 on the cover body 1 or the shell body wall along the first direction is set to 0.3, and the ratio S3 / S between the total effective cross-sectional area S3 of the plurality of overflow holes 214 and the total effective cross-sectional area S of the injection hole 11 is set to 1. After experimental verification, no damage was found in the electrode group, and no leakage was found.

[0099] In Example 20, the ratio S1 / S2 between the total effective cross-sectional area S1 of the multiple guide holes 213 and the projected area S2 of the guide groove 211 on the cover body 1 or the shell body wall along the first direction is set to 0.25, the ratio S1 / S between the total effective cross-sectional area S1 of the multiple guide holes 213 and the total effective cross-sectional area S of the injection hole 11 is set to 1, the ratio S3 / S4 between the total effective cross-sectional area S3 of the multiple overflow holes 214 and the projected area S4 of the overflow groove 212 on the cover body 1 or the shell body wall along the first direction is set to 0.3, and the ratio S3 / S between the total effective cross-sectional area S3 of the multiple overflow holes 214 and the total effective cross-sectional area S of the injection hole 11 is set to 0.8. After experimental verification, no damage was found in the electrode group, and no leakage was found.

[0100] In Example 21, the ratio S1 / S2 between the total effective cross-sectional area S1 of the multiple guide holes 213 and the projection area S2 of the guide groove 211 on the cover body 1 or the shell body wall along the first direction is set to 0.25, the ratio S1 / S between the total effective cross-sectional area S1 of the multiple guide holes 213 and the total effective cross-sectional area S of the injection hole 11 is set to 0.9, the ratio S3 / S4 between the total effective cross-sectional area S3 of the multiple overflow holes 214 and the projection area S4 of the overflow groove 212 on the cover body 1 or the shell body wall along the first direction is set to 0.6, and the ratio S3 / S between the total effective cross-sectional area S3 of the multiple overflow holes 214 and the total effective cross-sectional area S of the injection hole 11 is set to 0.6. After experimental verification, no damage was found in the electrode group, and no leakage was found.

[0101] In Example 22, the ratio S1 / S2 between the total effective cross-sectional area S1 of the multiple guide holes 213 and the projection area S2 of the guide groove 211 on the cover body 1 or the shell body wall along the first direction is set to 0.4, the ratio S1 / S between the total effective cross-sectional area S1 of the multiple guide holes 213 and the total effective cross-sectional area S of the injection hole 11 is set to 0.8, the ratio S3 / S4 between the total effective cross-sectional area S3 of the multiple overflow holes 214 and the projection area S4 of the overflow groove 212 on the cover body 1 or the shell body wall along the first direction is set to 0.6, and the ratio S3 / S between the total effective cross-sectional area S3 of the multiple overflow holes 214 and the total effective cross-sectional area S of the injection hole 11 is set to 1. After experimental verification, no damage was found in the electrode group, and no leakage was found.

[0102] In Example 23, the ratio S1 / S2 between the total effective cross-sectional area S1 of the multiple guide holes 213 and the projected area S2 of the guide groove 211 on the cover body 1 or the shell body wall along the first direction is set to 0.6, the ratio S1 / S between the total effective cross-sectional area S1 of the multiple guide holes 213 and the total effective cross-sectional area S of the injection hole 11 is set to 1, the ratio S3 / S4 between the total effective cross-sectional area S3 of the multiple overflow holes 214 and the projected area S4 of the overflow groove 212 on the cover body 1 or the shell body wall along the first direction is set to 0.4, and the ratio S3 / S between the total effective cross-sectional area S3 of the multiple overflow holes 214 and the total effective cross-sectional area S of the injection hole 11 is set to 0.6. After experimental verification, no damage was found in the electrode group, and no leakage was found.

[0103] In Example 24, the ratio S1 / S2 between the total effective cross-sectional area S1 of the multiple guide holes 213 and the projection area S2 of the guide groove 211 on the cover body 1 or the shell body wall along the first direction is set to 0.6, the ratio S1 / S between the total effective cross-sectional area S1 of the multiple guide holes 213 and the total effective cross-sectional area S of the injection hole 11 is set to 1.2, the ratio S3 / S4 between the total effective cross-sectional area S3 of the multiple overflow holes 214 and the projection area S4 of the overflow groove 212 on the cover body 1 or the shell body wall along the first direction is set to 0.6, and the ratio S3 / S between the total effective cross-sectional area S3 of the multiple overflow holes 214 and the total effective cross-sectional area S of the injection hole 11 is set to 1. After experimental verification, no damage was found in the electrode group, and no leakage was found.

[0104] It can be seen from Examples 17 to 24 that when the ratio S1 / S2 between the total effective cross-sectional area S1 of the multiple guide holes 213 and the projected area S2 of the guide groove 211 on the cover body 1 or the shell body wall along the first direction satisfies the range of 0.25≤S1 / S2≤0.6, the ratio S1 / S between the total effective cross-sectional area S1 of the multiple guide holes 213 and the total effective cross-sectional area S of the injection hole 11 satisfies the range of 0.8≤S1 / S≤1.2, the ratio S3 / S4 between the total effective cross-sectional area S3 of the multiple overflow holes 214 and the projected area S4 of the overflow groove 212 on the cover body 1 or the shell body wall along the first direction satisfies the range of 0.25≤S3 / S4≤0.6, and the ratio S3 / S between the total effective cross-sectional area S3 of the multiple overflow holes 214 and the total effective cross-sectional area S of the injection hole 11 satisfies the range of 0.6≤S3 / S≤1, no damage to the electrode group and no leakage were found.

[0105] In comparative example 11, the ratio S1 / S2 between the total effective cross-sectional area S1 of the plurality of guide holes 213 and the projection area S2 of the guide groove 211 on the wall of the cover body 1 or the shell body along the first direction is set to 0.2, the ratio S1 / S between the total effective cross-sectional area S1 of the plurality of guide holes 213 and the total effective cross-sectional area S of the injection hole 11 is set to 0.8, the ratio S3 / S4 between the total effective cross-sectional area S3 of the plurality of overflow holes 214 and the projection area S4 of the overflow groove 212 on the wall of the cover body 1 or the shell body along the first direction is set to 0.2, and the ratio S3 / S between the total effective cross-sectional area S3 of the plurality of overflow holes 214 and the total effective cross-sectional area S of the injection hole 11 is set to 0.6. After experimental verification, the electrode group was not damaged and a small amount of liquid leakage was found.

[0106] It can be seen from Comparative Example 11 that by making the ratio S1 / S2 of the total effective cross-sectional area S1 of the multiple guide holes 213 and the projected area S2 of the guide groove 211 along the first direction on the cover body 1 less than the minimum value in the range of 0.25≤S1 / S2≤0.6, and the ratio S3 / S4 of the total effective cross-sectional area S3 of the multiple overflow holes 214 and the projected area S4 of the overflow groove 212 along the first direction on the cover body 1 less than the minimum value in the range of 0.25≤S3 / S4≤0.6, the total effective cross-sectional area S1 of the guide holes 213 and the total effective cross-sectional area S3 of the overflow holes 214 are small, which greatly slows down the speed of electrolyte injection. Although the protection of the electrode group is improved, the slow flow rate causes overflow and a small amount of seepage occurs.

[0107] In comparative example 12, the ratio S1 / S2 between the total effective cross-sectional area S1 of the plurality of guide holes 213 and the projection area S2 of the guide groove 211 on the wall of the cover body 1 or the shell body along the first direction is set to 0.2, the ratio S1 / S between the total effective cross-sectional area S1 of the plurality of guide holes 213 and the total effective cross-sectional area S of the injection hole 11 is set to 0.6, the ratio S3 / S4 between the total effective cross-sectional area S3 of the plurality of overflow holes 214 and the projection area S4 of the overflow groove 212 on the wall of the cover body 1 or the shell body along the first direction is set to 0.2, and the ratio S3 / S between the total effective cross-sectional area S3 of the plurality of overflow holes 214 and the total effective cross-sectional area S of the injection hole 11 is set to 0.4. After experimental verification, the electrode group was not damaged and a large amount of seepage was found.

[0108] It can be seen from Comparative Example 12 that by making the ratio S1 / S2 of the total effective cross-sectional area S1 of the plurality of guide holes 213 and the projection area S2 of the guide groove 211 on the wall of the cover body 1 or the shell body along the first direction less than the minimum value in the range of 0.25≤S1 / S2≤0.6, the ratio S1 / S of the total effective cross-sectional area S1 of the plurality of guide holes 213 and the total effective cross-sectional area S of the injection hole 11 less than the minimum value in the range of 0.8≤S1 / S≤1.2, and the ratio S3 / S4 of the total effective cross-sectional area S3 of the plurality of overflow holes 214 and the projection area S4 of the overflow groove 212 on the wall of the cover body 1 or the shell body along the first direction less than 0.25 ≤S3 / S4≤0.6 and the ratio S3 / S between the total effective cross-sectional area S3 of the plurality of overflow holes 214 and the total effective cross-sectional area S of the injection hole 11 is smaller than the minimum value of the range, which not only makes the total effective cross-sectional area S1 of the guide holes 213 and the total effective cross-sectional area S3 of the overflow holes 214 smaller, but also makes the flow velocity deviation of the guide holes 213 and the overflow holes 214 relative to the injection hole 11 larger, which is equivalent to reducing the outflow speed of the electrolyte through the guide holes 213 and the overflow holes 214. At the same time, because the flow velocity of the guide holes 213 and the overflow holes 214 is lower than the flow velocity of the injection hole 11, the overflow problem is more serious, and a large amount of seepage occurs.

[0109] In comparative example 13, the ratio S1 / S2 between the total effective cross-sectional area S1 of the plurality of guide holes 213 and the projection area S2 of the guide groove 211 on the wall of the cover body 1 or the shell body along the first direction is set to 0.8, the ratio S1 / S between the total effective cross-sectional area S1 of the plurality of guide holes 213 and the total effective cross-sectional area S of the injection hole 11 is set to 1.2, the ratio S3 / S4 between the total effective cross-sectional area S3 of the plurality of overflow holes 214 and the projection area S4 of the overflow groove 212 on the wall of the cover body 1 or the shell body along the first direction is set to 0.6, and the ratio S3 / S between the total effective cross-sectional area S3 of the plurality of overflow holes 214 and the total effective cross-sectional area S of the injection hole 11 is set to 1.2. After experimental verification, no damage was found in the electrode group, but no leakage was found.

[0110] It can be seen from Comparative Example 13 that when the ratio of the total effective cross-sectional area S1 of the multiple guide holes 213 to the projected area S2 of the guide groove 211 along the first direction on the cover plate body 1 is greater than the maximum value of 0.25≤S1 / S2≤0.6 and the ratio of the total effective cross-sectional area S3 of the multiple overflow holes 214 to the total effective cross-sectional area S of the injection hole 11 is greater than the maximum value of 0.6≤S3 / S≤1, it can be seen that the total effective area S1 of the guide holes 213 is too large, so the flow velocity out of the guide holes 213 is large, and the outflow velocity of the overflow holes 214 is greater than the inflow velocity of the injection hole 11, so the overflow holes 214 cannot play a buffering effect through the aperture. Combining the above two points, the electrolyte flows out through the overflow holes 214 and the guide holes 213 at a faster speed, which has a certain impact force on the electrode group, causing damage to the electrode group.

[0111] In comparative example 14, the ratio S1 / S2 between the total effective cross-sectional area S1 of the plurality of guide holes 213 and the projection area S2 of the guide groove 211 on the wall of the cover body 1 or the shell body along the first direction is set to 0.6, the ratio S1 / S between the total effective cross-sectional area S1 of the plurality of guide holes 213 and the total effective cross-sectional area S of the injection hole 11 is set to 1.2, the ratio S3 / S4 between the total effective cross-sectional area S3 of the plurality of overflow holes 214 and the projection area S4 of the overflow groove 212 on the wall of the cover body 1 or the shell body along the first direction is set to 0.8, and the ratio S3 / S between the total effective cross-sectional area S3 of the plurality of overflow holes 214 and the total effective cross-sectional area S of the injection hole 11 is set to 1. After experimental verification, no damage was found in the electrode group, but no leakage was found.

[0112] It can be seen from Comparative Example 14 that when the ratio S3 / S4 of the total effective cross-sectional area S3 of the plurality of overflow holes 214 and the projected area S4 of the overflow groove 212 along the first direction on the cover body 1 is greater than the maximum value of 0.25≤S3 / S4≤0.6, it can be seen that the total effective area S3 of the overflow holes 214 is too large, so the flow velocity out of the overflow holes 214 is relatively large, which has a certain impact force on the electrode group, causing damage to the electrode group.

[0113] In comparative example 15, the ratio S1 / S2 between the total effective cross-sectional area S1 of the plurality of guide holes 213 and the projection area S2 of the guide groove 211 on the wall of the cover body 1 or the shell body along the first direction is set to 0.4, the ratio S1 / S between the total effective cross-sectional area S1 of the plurality of guide holes 213 and the total effective cross-sectional area S of the injection hole 11 is set to 1, the ratio S3 / S4 between the total effective cross-sectional area S3 of the plurality of overflow holes 214 and the projection area S4 of the overflow groove 212 on the wall of the cover body 1 or the shell body along the first direction is set to 0.8, and the ratio S3 / S between the total effective cross-sectional area S3 of the plurality of overflow holes 214 and the total effective cross-sectional area S of the injection hole 11 is set to 1.2. After experimental verification, no damage was found in the electrode group, but no leakage was found.

[0114] It can be seen from comparative example 15 that when the ratio S3 / S4 of the total effective cross-sectional area S3 of the plurality of overflow holes 214 and the projected area S4 of the overflow groove 212 along the first direction on the cover body 1 or the wall of the shell body is greater than the maximum value of 0.25≤S3 / S4≤0.6, it can be seen that the total effective area S3 of the overflow holes 214 is too large, so the flow rate out of the overflow holes 214 is relatively large, which has a certain impact force on the electrode group, and the outflow speed of the overflow holes 214 is greater than the inflow speed of the injection hole 11, so the overflow holes 214 cannot play a buffering effect through the aperture. Combining the above two points, the electrolyte flows out through the overflow holes 214 and the guide holes 213 at a faster speed, which also has a certain impact force on the electrode group. The combination of the two causes damage to the electrode group during the injection process.

[0115] In comparative example 16, the ratio S1 / S2 between the total effective cross-sectional area S1 of the plurality of guide holes 213 and the projection area S2 of the guide groove 211 on the wall of the cover body 1 or the shell body along the first direction is set to 0.8, the ratio S1 / S between the total effective cross-sectional area S1 of the plurality of guide holes 213 and the total effective cross-sectional area S of the injection hole 11 is set to 1.2, the ratio S3 / S4 between the total effective cross-sectional area S3 of the plurality of overflow holes 214 and the projection area S4 of the overflow groove 212 on the wall of the cover body 1 or the shell body along the first direction is set to 0.6, and the ratio S3 / S between the total effective cross-sectional area S3 of the plurality of overflow holes 214 and the total effective cross-sectional area S of the injection hole 11 is set to 1. After experimental verification, no damage was found in the electrode group, but no leakage was found.

[0116] It can be seen from Comparative Example 16 that when the ratio of the total effective cross-sectional area S1 of the plurality of guide holes 213 to the projected area S2 of the guide groove 211 along the first direction on the cover body 1 or the wall of the shell body is greater than the maximum value of 0.25≤S1 / S2≤0.6, it can be seen that the total effective area S1 of the guide holes 213 is too large, so the flow velocity out of the guide holes 213 is relatively large, and it also has a certain impact force on the electrode group, causing damage to the electrode group during the injection process.

[0117] Alternatively, if Figure 2 As shown, the distance dimension along the second direction between the boundary of the overflow hole 214 closest to the pole lug 100 among the multiple overflow holes 214 and the pole lug 100 is L2, and L2≥1mm is satisfied. By setting the distance dimension between the boundary of the overflow hole 214 closest to the pole lug 100 among the multiple overflow holes 214 to be L2, and limiting the distance dimension L2 between the boundary of the overflow hole 214 closest to the pole lug 100 among the multiple overflow holes 214 and the pole lug 100 to satisfy L2≥1mm, it is ensured that a certain distance is maintained between the pole lug 100 and the overflow hole 214, so as to avoid the electrolyte from flowing out of the overflow hole 214, which will cause impact on the pole lug 100, thereby causing damage to the pole lug 100.

[0118] Alternatively, if Figure 3 As shown, the guide hole 213 is a circular through hole, an elliptical through hole or a polygonal through hole. By selecting various types of through holes as the guide hole 213, it is convenient to freely choose according to actual needs during production.

[0119] Alternatively, if Figure 3 As shown, the overflow hole 214 is a circular through hole, an elliptical through hole or a polygonal through hole. By selecting various types of through holes as the overflow hole 214, it is convenient to freely choose according to actual needs during production.

[0120] Optionally, the first insulating structural member 2 is a plastic member integrally formed by an injection molding process. By using a plastic member integrally formed by an injection molding process as the first insulating structural member 2, the insulation of the first insulating structural member 2 is ensured on the one hand, and on the other hand, it is convenient to form a liquid injection structure 21 consisting of a guide groove 211 and an overflow groove 212 on the first insulating structural member 2 during manufacturing.

[0121] In this embodiment, a battery is also provided, comprising an electrode group and the above-mentioned battery casing, wherein the electrode group is accommodated in the battery casing. By using the above-mentioned battery casing, the battery not only has a lower risk of insulation failure, thereby improving the safety of use, but also improves the product quality by reducing the damage to the electrode group during the manufacturing process.

[0122] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A battery housing, characterized in that: The battery housing comprises a cover plate body, a housing body and a first insulating structural member, wherein the housing body is a hollow shell structure with an opening, the cover plate body is arranged at the opening of the housing body to form a receiving cavity for receiving the electrode group, a liquid injection hole is provided on the wall surface of the cover plate body or the housing body opposite to the side where the electrode group extends out of the electrode lug, and the first insulating structural member is located in the receiving cavity and is arranged on the side where the electrode group extends out of the electrode lug; A liquid injection structure is provided on a side of the first insulating structural member opposite to the liquid injection hole, the liquid injection structure includes a guide groove and an overflow groove connected to each other, the projection of the guide groove on the wall surface of the cover plate body or the shell body along the first direction covers the liquid injection hole, and a guide hole penetrating the guide groove is provided, and an overflow hole penetrating the overflow groove is provided on the overflow groove; The depth dimension of the guide groove along the first direction is H1, the depth dimension of the overflow groove along the first direction is H2, and 1≤H1 / H2≤3 is satisfied; The guide groove is provided with a plurality of guide holes, the total effective cross-sectional area of ​​the plurality of guide holes is S1, the projection area of ​​the guide groove on the wall surface of the cover body or the shell body along the first direction is S2, and 0.25≤S1 / S2≤0.6 is satisfied.

2. The battery housing according to claim 1, characterized in that: A buffer slope is provided between the guide groove and the overflow groove, and the length dimension of the buffer slope along the second direction is L1, and satisfies 2mm≤L1≤10mm.

3. The battery housing according to claim 2, characterized in that: The angle between the buffer slope and the extension surface of the bottom surface of the guide groove extending in the direction of the overflow groove is θ, and satisfies 15°≤θ≤70°.

4. The battery housing according to claim 1, characterized in that: The total effective cross-sectional area of ​​the injection hole for the electrolyte to flow is S, and satisfies 0.8≤S1 / S≤1.

2.

5. The battery housing according to claim 1, characterized in that: The overflow groove is provided with a plurality of overflow holes, the total effective cross-sectional area of ​​the plurality of overflow holes is S3, the projection area of ​​the overflow groove along the first direction on the wall surface of the cover body or the shell body is S4, and 0.25≤S3 / S4≤0.6 is satisfied.

6. The battery housing according to claim 5, characterized in that: The total effective cross-sectional area of ​​the injection hole is S, and satisfies 0.6≤S3 / S≤1.

7. The battery housing according to claim 5, characterized in that: A distance dimension along the second direction between a boundary of one of the overflow holes closest to the electrode tab and the electrode tab is L2, and L2≥1 mm.

8. The battery housing according to claim 1, characterized in that: The first insulating structural component is a plastic component integrally formed by an injection molding process.

9. A battery, characterized in that The battery comprises a pole group and a battery casing as claimed in any one of claims 1 to 8, wherein the pole group is accommodated in the battery casing.

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