Battery

Abstract

The invention discloses a battery which comprises a shell, a battery cell, an insulating plate and a blocking piece, a liquid injection hole is formed in one side of the shell in a first direction, the battery cell is arranged in the shell, the insulating plate is arranged on one side, provided with the liquid injection hole, in the shell, and a liquid passing hole is formed in the insulating plate. The blocking piece is arranged on the side, back to the liquid injection hole, of the insulating plate and comprises a connecting part and a blocking plate, one end of the connecting part is connected with the insulating plate, the other end of the connecting part is connected with the blocking plate, the projection of the liquid injection hole in the first direction is located in the projection of the blocking plate in the first direction, and the connecting part is provided with an opening. The area of the projection of the barrier plate in the first direction is S1, the unit is mm < 2 >, the area of the projection of the liquid injection hole in the first direction is S2, the unit is mm < 2 >, the distance between the barrier plate and the insulating plate is h, the unit is mm, and (S2 / S1) * h is larger than or equal to 0.01 and smaller than or equal to 9. According to the invention, the performance of the battery is ensured, the liquid injection efficiency is also ensured, and the reliability of the blocking piece can also be ensured.

Description

Technical Field

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

[0002] With the increasing development of the new energy industry, as a key component of the new energy industry, the research and development of power batteries has received more and more extensive attention.

[0003] A power battery includes a housing, a cover assembly and an electric core. The electric core is arranged in the housing, the cover assembly covers the upper part of the housing, and a liquid injection port communicating with the inside of the housing is formed on the cover assembly. When injecting liquid into the power battery, after the electrolyte enters the housing from the liquid injection port, under the action of gravity, the electrolyte directly impacts the electrode plate and the separator of the electric core downward, which is likely to cause the electrode plate to drop materials and lithium deposition, and is also likely to cause the separator to fold, resulting in insulation failure and affecting the battery performance. Summary of the Invention

[0004] The purpose of the present invention is to provide a battery to ensure the performance of the battery.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: A battery having a first direction and a second direction perpendicular to each other, comprising: An outer shell having a liquid injection hole formed on one side in the first direction; An electric core arranged in the outer shell; An insulating plate arranged on the side of the outer shell where the liquid injection hole is formed, and a liquid passing hole corresponding to the liquid injection hole is formed on the insulating plate, and the first direction is perpendicular to the insulating plate; A blocking member arranged on the side of the insulating plate facing away from the liquid injection hole, and the blocking member corresponds to the liquid passing hole. The blocking member includes a hollow connecting portion and a blocking plate. One end of the connecting portion is connected to the insulating plate, and the other end of the connecting portion is connected with the blocking plate. The projection of the liquid injection hole in the first direction is located within the projection of the blocking plate in the first direction. The connecting portion is provided with an opening penetrating inside and outside, and the liquid injection hole, the liquid passing hole and the opening form a liquid injection channel; Wherein, the area of the projection of the blocking plate in the first direction is S1, unit mm 2 , the area of the projection of the liquid injection hole in the first direction is S2, unit mm 2 , the distance between the blocking plate and the insulating plate is h, unit mm, 0.01 ≤ (S2 / S1) * h ≤ 9.

[0006] Compared with the prior art, the beneficial effect of a battery according to an embodiment of the present invention is as follows: In the present invention, during the process of injecting electrolyte into the battery, the electrolyte is injected into the battery through the injection hole. Due to the action of gravity, the electrolyte will directly impact the battery cell downward, easily causing the diaphragm of the battery cell to wrinkle, thereby affecting its insulation effect, or easily damaging the electrode sheet of the battery cell and causing material loss, affecting the battery performance. Therefore, in the present invention, a blocking member is provided on the insulating plate. The blocking member includes a connecting portion and a blocking plate. The connecting portion is provided with a hollow interior. One end of the connecting portion is connected to the insulating plate. The insulating plate is provided with a liquid passing hole, and the liquid passing hole communicates the injection hole and the interior of the connecting portion. The other end of the connecting portion is provided with the blocking plate to close the connecting portion. An opening communicating the inside and outside is provided on the connecting portion. Thus, after the electrolyte is injected from the injection hole, the blocking plate can block the electrolyte, allowing the electrolyte to flow out from the opening, avoiding the electrolyte from directly flushing the battery cell downward, and ensuring the performance of the battery. Then, by maintaining 0.01 ≤ (S2 / S1) * h ≤ 9, while ensuring the injection efficiency of the electrolyte, the excessive impact force of the electrolyte can be avoided, preventing the blocking member from deforming and being damaged. Description of the Drawings

[0007] Figure 1 is a schematic diagram of the cover plate of the battery according to an embodiment of the present invention; Figure 2 is another schematic diagram of the cover plate of the battery according to an embodiment of the present invention; Figure 3 is Figure 2 the enlarged view of part A in Figure 4 is a cross-sectional view of the cover plate according to an embodiment of the present invention; Figure 5 is Figure 4 the enlarged view of part B in Figure 6 is another schematic diagram of the cover plate according to an embodiment of the present invention; Figure 7 is Figure 6 the enlarged view of part C in Figure 8 is a schematic diagram of the battery according to one embodiment of the present invention; Figure 9 is a schematic diagram of the battery according to another embodiment of the present invention.

[0008] In the figures, 1, cover plate; 11, injection hole; 12, sink; 2, blocking member; 21, connecting portion; 22, blocking plate; 23, opening; 24, first region; 25, second region; 3, pole column; 4, housing; 5, battery cell; 6, tab; 7, adapter plate; 8, insulating plate; 81, liquid passing hole. Detailed Embodiments

[0009] The specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0010] In the description of the present invention, it should be understood that the term "comprising" used in the specification of the present invention means the presence of the described features, integers, steps, operations, components and / or assemblies, but does not exclude the presence or addition of one or more other features, integers, steps, operations, components, assemblies and / or their groups. It should be understood that when we say that a component is "connected" to another component, it can be directly connected to other components, or there may also be intermediate components. The term "and / or" used herein includes all or any unit and all combinations of one or more related listed items.

[0011] As Figures 1 to 9 shown, the present invention relates to a battery having a first direction and a second direction perpendicular to each other, including a housing, a battery cell 5, an insulating plate 8 and a blocking member 2. A liquid injection hole 11 is provided on one side of the housing in the first direction. The battery cell 5 is arranged inside the housing. The insulating plate 8 is arranged on the side of the housing where the liquid injection hole 11 is provided, and a liquid passing hole 81 corresponding to the liquid injection hole 11 is provided on the insulating plate 8. The first direction is perpendicular to the insulating plate 8. Specifically, the first direction is the height direction of the battery, and the second direction is the length direction of the battery.

[0012] The blocking member 2 is arranged on the side of the insulating plate 8 facing away from the liquid injection hole 11 and corresponds to the liquid passing hole 81. The blocking member 2 includes a hollow connecting portion 21 and a blocking plate 22. One end of the connecting portion 21 is connected to the insulating plate 8, and the other end of the connecting portion 21 is connected with the blocking plate 22. The projection of the liquid injection hole 11 in the first direction is located within the projection of the blocking plate 22 in the first direction. The connecting portion 21 is provided with an opening 23 penetrating inside and outside. The liquid injection hole 11, the liquid passing hole 81 and the opening 23 form a liquid injection channel.

[0013] Wherein, the area of the projection of the blocking plate 22 in the first direction is S1 mm 2 2, and the area of the projection of the liquid injection hole 11 in the first direction is S2 mm 2 2, and the distance between the blocking plate 22 and the insulating plate 8 is h mm, 0.01 ≤ (S2 / S1) * h ≤ 9. The value of (S2 / S1) * h can also be 0.05, 0.08, 0.1, 0.2, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5 or 8.8.

[0014] In the present invention, during the process of injecting electrolyte into the battery, the electrolyte is injected into the battery through the injection hole 11. Due to the action of gravity, the electrolyte will directly impact the battery cell 5 downward, easily causing the diaphragm of the battery cell 5 to wrinkle, thereby affecting its insulation effect, or easily damaging and dropping the electrode sheet of the battery cell 5, affecting the battery performance. Therefore, in the present invention, a blocking member 2 is provided on the insulating plate 8. The blocking member 2 includes a connecting portion 21 and a blocking plate 22. The connecting portion 21 is hollowly provided. One end of the connecting portion 21 is connected to the insulating plate 8. The insulating plate 8 is provided with a liquid passing hole 81. The liquid passing hole 81 communicates the injection hole 11 and the interior of the connecting portion 21. The other end of the connecting portion 21 is provided with the blocking plate 22 to close the connecting portion 21. An opening 23 communicating the inside and outside is provided on the connecting portion 21. Thus, after the electrolyte is injected from the injection hole 11, the blocking plate 22 can block the electrolyte, allowing the electrolyte to flow out from the opening 23, avoiding the electrolyte directly flushing the battery cell 5 downward, and ensuring the performance of the battery. Then, by maintaining 0.01 ≤ (S2 / S1) * h ≤ 9, while ensuring the injection efficiency of the electrolyte, the excessive impact force of the electrolyte is avoided, causing deformation and damage to the blocking member 2.

[0015] In some embodiments, one end of the opening 23 in the first direction extends to the insulating plate 8, and there is a distance between the other end of the opening 23 in the first direction and the blocking plate 22, 5 ≤ (S2 / S1) * h ≤ 9; thus, when the electrolyte is injected, the electrolyte will first stay in the connecting portion 21, thereby playing a buffering role for the subsequently injected electrolyte, reducing the impact on the blocking member 2, and at the same time maintaining 5 ≤ (S2 / S1) * h ≤ 9 to ensure the injection efficiency.

[0016] In some embodiments, one end of the opening 23 in the first direction extends to the blocking plate 22, and there is a distance between the other end of the opening 23 in the first direction and the insulating plate 8, 0.01 ≤ (S2 / S1) * h ≤ 3; thus, the electrolyte injected into the connecting portion 21 can quickly spray out from the opening 23, improving the injection efficiency of the electrolyte. At the same time, maintaining 0.01 ≤ (S2 / S1) * h ≤ 3 reduces the risk of deformation and damage of the blocking member 2.

[0017] In some embodiments, one end of the opening 23 in the first direction extends to the insulating plate 8, and the other end of the opening 23 in the first direction extends to the blocking plate 22, and then 0.1 ≤ (S2 / S1) * h ≤ 6 is maintained, thereby improving the injection efficiency and ensuring the reliability of the blocking member 2.

[0018] In some embodiments, one opening 23 is provided on the connecting portion 21, and the area of the opening 23 is K1, unit mm 2, the area of the outer side surface of the connecting portion 21 is K2, unit: mm 2 , where 0.3 ≤ K1 / K2 ≤ 0.7. The value of K1 / K2 can also be 0.33, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6 or 0.65.

[0019] The area of the opening 23 affects the flow rate of the electrolyte and also affects the structural strength of the barrier member 2. When K1 / K2 is too small, it means the size of the opening 23 is too small, and then the liquid injection efficiency will become low; when K1 / K2 is too large, it means the size of the opening 23 is too large, and then the structural strength of the connecting portion 21 becomes weak, making the overall strength of the barrier member 2 weak. By maintaining 0.3 ≤ K1 / K2 ≤ 0.7, the liquid injection efficiency can be ensured, and the overall strength of the barrier member 2 can also be ensured.

[0020] In some embodiments, a plurality of the openings 23 are formed in the connecting portion 21, and the total area of the plurality of openings 23 is K3, unit: mm 2 , the area of the outer side surface of the connecting portion 21 is K2, unit: mm 2 , where 0.5 ≤ K3 / K2 ≤ 0.8. The value of K3 / K2 can also be 0.52, 0.55, 0.58, 0.6, 0.62, 0.65, 0.68, 0.7, 0.73, 0.75 or 0.78.

[0021] A plurality of openings 23 are formed in the side wall of the connecting portion 21, which is beneficial for the electrolyte to be more evenly scattered at the battery cell 5, and the force of flushing the battery cell 5 is weak, so as to avoid affecting the performance of the battery; by maintaining 0.5 ≤ K3 / K2 ≤ 0.8, the liquid injection efficiency can be ensured, and the overall structural strength of the barrier member 2 can also be guaranteed, ensuring the reliability of the barrier member 2.

[0022] Preferably, a plurality of the openings 23 are located in the area of the connecting portion 21 on one side in the length direction facing the outer shell, that is, a plurality of the openings 23 are located in the area of the connecting portion 21 facing the wide side of the outer shell, so that the electrolyte mainly sprays along the length direction of the outer shell, so that the electrolyte will not impact the inner side wall of the long side of the battery, and flows down along the inner side wall of the battery to impact the battery cell 5, avoiding damage to the battery cell 5.

[0023] In some embodiments, the connecting portion 21 is perpendicularly arranged with one side of the insulating plate 8 in the first direction, which is convenient for manufacturing and ensures the reliability of the structure of the barrier member 2.

[0024] In some embodiments, the barrier plate 22 and the insulating plate 8 are arranged parallel to each other to also ensure the reliability of the structure of the barrier member 2.

[0025] In some embodiments, the line connecting the two ends of the opening 23 in the vertical first direction projects onto the baffle 22 in the first direction, dividing the surface of the baffle 22 in the first direction into a first region 24 and a second region 25. The area of the first region 24 is M1, with the unit of mm 2 , and the area of the second region 25 is M2, with the unit of mm 2 , where 1 / 3 ≤ M1 / M2 ≤ 2 / 3. The value of M1 / M2 can also be 0.4, 0.45, 0.5, 0.55, or 0.6.

[0026] Specifically, the line connecting the two ends of the opening 23 in the horizontal direction projects onto the baffle 22 in the height direction of the battery, so that the region on one side of the line on the plane of the baffle 22 forms the first region 24, and the region on the other side of the line forms the second region 25. M1 and M2 reflect the size of the opening 23 occupying the side wall of the connecting portion 21. Therefore, maintaining 1 / 3 ≤ M1 / M2 ≤ 2 / 3 ensures the injection efficiency while ensuring the reliability of the blocking member 2 and reducing the impact on the battery cell 5 during injection.

[0027] In some embodiments, on one side of the housing where the liquid injection hole 11 is provided, two pole columns 3 are provided at intervals in the second direction. In the first direction, one end of the pole column 3 penetrates through the insulating plate 8 to the inside of the housing, and the other end of the pole column 3 penetrates to the outside of the housing. The blocking member 2 is located between the two pole columns 3, and the opening 23 on the connecting portion 21 faces the pole column 3 farthest from it and / or the center of the side of the housing where the liquid injection hole 11 is provided.

[0028] When the opening 23 of the connecting portion 21 faces the pole column 3 farthest from it, during the liquid injection process, the electrolyte can be ejected from the opening 23 in the length direction of the housing, and the electrolyte cannot be sprayed onto the pole column 3. Therefore, the electrolyte will not impact the welding position of the pole column 3 and the battery cell 5, and will not affect the electrical connection between the pole column 3 and the battery cell 5. When the opening 23 of the connecting portion 21 faces the center of the side of the housing where the liquid injection hole 11 is provided, the opening 23 of the connecting portion 21 does not face the pole column 3 directly. Therefore, when the electrolyte is ejected from the opening 23, most of the electrolyte will not impact the pole column 3, and will not affect the electrical connection between the pole column 3 and the battery cell 5.

[0029] In some embodiments, 20mm 2 ≤ S1 ≤ 180mm 2 , so as to ensure the injection efficiency and the structural strength of the blocking member 2. The value of S1 can also be 30mm 2 , 40mm 2 , 50mm 2 , 60mm2 , 70 mm 2 , 80 mm 2 , 90 mm 2 , 100 mm 2 , 110 mm 2 , 120 mm 2 , 130 mm 2 , 140 mm 2 , 150 mm 2 , 160 mm 2 or 170 mm 2 .

[0030] In some embodiments, 2 mm ≤ S2 ≤ 20 mm is maintained to ensure the liquid injection efficiency and prevent the blocking member 2 from deforming and being damaged. The value of S2 can also be 3 mm 2 , 5 mm 2 , 8 mm 2 , 10 mm 2 , 13 mm 2 , 15 mm 2 , 17 mm 2 , 19 mm 2 or 19 mm 2 . 2 .

[0031] In some embodiments, 1 mm ≤ h ≤ 9 mm is maintained to ensure the liquid injection efficiency and ensure that the blocking member 2 does not deform and is not damaged. The value of h can also be 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm or 8 mm.

[0032] In some embodiments, a counterbore 12 is formed on the side of the housing facing away from the insulating plate 8. The depth of the counterbore 12 in the first direction is L, in mm, and the liquid injection hole 11 is provided at the bottom of the counterbore 12. Wherein, 0.5 mm ≤ L ≤ 1.5 mm, 0.2 ≤ (S2 / S1) * h ≤ 9. The value of L can also be 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.3 mm or 1.4 mm.

[0033] By providing the counterbore 12 and maintaining 0.5 mm ≤ L ≤ 1.5 mm, 0.2 ≤ (S2 / S1) * h ≤ 9, on the one hand, it is convenient to carry out the liquid injection work of the electrolyte, and on the other hand, the distance for the electrolyte to reach the blocking member 2 during liquid injection can be reduced, thereby reducing the impact force and avoiding deformation or damage to the blocking member 2.

[0034] In some embodiments, a pole column 3 is provided on one side of the outer shell where the liquid injection hole 11 is formed. In a first direction, one end of the pole column 3 penetrates through the insulating plate 8 to the inside of the outer shell, and the other end of the pole column 3 penetrates to the outside of the outer shell. An electrode tab 6 is provided on one side of the battery cell 5 facing the insulating plate 8, and the electrode tab 6 is electrically connected to the pole column 3. In the first direction, the distance between the battery cell 5 and the baffle plate 22 is E, in millimeters (mm), where 0.2 mm ≤ E ≤ 1.5 mm. The value of E can also be 0.3 mm, 0.5 mm, 0.7 mm, 0.8 mm, 1 mm, 1.2 mm or 1.4 mm.

[0035] During the use of the battery, the battery cell 5 will expand. If the battery cell 5 is too close to the baffle plate 22, the expanded battery cell 5 is likely to push against the baffle plate 22, causing damage to the battery cell 5. Moreover, if the battery cell 5 is too far from the baffle plate 22, the size of the battery cell 5 will be too small, resulting in a waste of the internal space of the battery. Therefore, by maintaining 0.2 mm ≤ E ≤ 1.5 mm, during the use of the battery, the battery cell 5 will not push against the baffle plate 22 and will not affect the utilization rate of the internal space of the battery.

[0036] In some embodiments, the battery further includes a connecting piece 7 disposed inside the outer shell. A pole column 3 is provided on one side of the outer shell where the liquid injection hole 11 is formed. In a first direction, one end of the pole column 3 penetrates through the insulating plate 8 to the inside of the outer shell, and the other end of the pole column 3 penetrates to the outside of the outer shell. Electrode tabs 6 are provided on both sides of the battery cell 5 in the length direction, and the electrode tabs 6 are electrically connected to the pole column 3 through the connecting piece 7. The distance between the top of the battery cell 5 and the baffle plate 22 is D, in millimeters (mm), where 0.5 mm ≤ D ≤ 2 mm. The value of D can also be 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 1.7 mm or 1.9 mm.

[0037] During the use of the battery, the battery cell 5 will expand. If the battery cell 5 is too close to the baffle plate 22, the expanded battery cell 5 is likely to push against the baffle plate 22, causing damage to the battery cell 5. Moreover, if the battery cell 5 is too far from the baffle plate 22, the size of the battery cell 5 will be too small, resulting in a waste of the internal space of the battery. Therefore, by maintaining 0.5 mm ≤ D ≤ 2 mm, during the use of the battery, the battery cell 5 will not push against the baffle plate 22 and will not affect the utilization rate of the internal space of the battery.

[0038] In some embodiments, the outer shell includes a housing 4 and a cover plate 1. The housing 4 is provided with an installation opening on one side in a first direction, and the cover plate 1 is covered at the installation opening. The insulating plate 8 is located on the side of the cover plate 1 facing the inside of the housing 4. The liquid injection hole 11, the pole column 3, and the sinking groove 12 are all located on the cover plate 1.

[0039] To further illustrate the effects of the present invention, the present invention provides the following test methods: A batch of battery models with the same specifications are used as test objects. The relevant parameters of the liquid injection hole and the blocking member corresponding to each battery cover are different, and the battery is subjected to a liquid injection test using the conventional liquid injection equipment on the production line.

[0040] Liquid injection volume: 1000g; Liquid injection pressure: 0.6mpa; Liquid injection time: less than or equal to 23mim; Judgment: Under the predetermined liquid injection pressure, within 23 minutes, if all the preset electrolyte in the liquid injection equipment is injected into the battery, it is judged as qualified. Conversely, if the liquid injection time exceeds 23 minutes, it is judged as unqualified.

[0041] The injected battery is disassembled to observe whether there are wrinkles in the separator at the top of the battery cell and whether the electrode sheet drops during the state of the battery electrode sheet.

[0042] The specific test data is shown in the following table: In Examples 1 to 22, during the liquid injection process of the tested batteries, the liquid injection can be completed within the designed specified time. After disassembling the batteries, the top of the battery cell is normal, the separator does not have wrinkles, and the electrode sheet does not drop, indicating that the impact force of the electrolyte on the top of the battery cell is small, but the liquid injection can be completed within the normal time.

[0043] In Examples 23 to 45, the liquid injection time and the battery disassembly situation during the test process meet the design requirements, but there are other process problems respectively during the test process; In Examples 23, 24, 25, 42, and Example 43, due to the small area of the baffle plate, the diffusion range of the electrolyte after contacting the baffle plate is small. After disassembling the battery, it is found that there is residual electrolyte in the housing, indicating that part of the electrolyte in the battery cell is not completely infiltrated. Although it is necessary to stand still for a long time for infiltration during the battery manufacturing process, when the area of the baffle plate is small, it will indirectly increase the electrolyte infiltration time and lengthen the production cycle.

[0044] In Examples 26, 27, 28, 29, 44 and Example 45, due to the large area of the baffle plate, it occupies a large space inside the battery. During the assembly process of some batteries, the tabs are prone to interference with the blocking parts, resulting in the bending of the tabs, which affects the overcurrent during the use of the battery.

[0045] In Examples 30, 31, 31, 42, 43 and Example 44, due to the too small aperture of the liquid injection hole, during liquid injection, there is a leakage situation. Part of the electrolyte spills on the surface of the battery cover plate, and even spills on the explosion-proof valve and the pole column, causing corrosion and affecting the safety performance of the battery.

[0046] In Examples 33, 34, 35 and Example 45, due to the large aperture of the liquid injection hole, when sealing the liquid injection hole after liquid injection, the sealing nail needs to have a larger diameter. However, the larger the sealing area, the greater the risk of sealing failure, which affects the safety performance during the use of the battery.

[0047] In Examples 36, 37, 38 and Example 42, due to the short connecting part, the baffle plate is close to the cover plate. When sealing the liquid injection hole, the sealing nail will abut against the baffle plate, and there will be process problems such as the sealing failure of the sealing nail and the baffle plate falling into the battery cell.

[0048] In Examples 39, 40, 41, 43, 44 and Example 45, due to the long connecting part, the strength of the connecting part is relatively poor. During the liquid injection process, there is a risk of deformation and damage of the connecting part. At the same time, the long connecting part causes the baffle plate to be close to the top of the battery cell. After the battery cell is injected with liquid and left standing, during the charge and discharge process, the battery cell will expand, and there will be a situation where the battery cell abuts against the baffle plate, causing damage to the electrode sheet and posing a safety hazard.

[0049] In Comparative Examples 1-6, although the battery can complete liquid injection within the designed time during the liquid injection process, after the battery is disassembled, it is found that the battery cell diaphragms on the top of the battery cell are all deformed and wrinkled, and part of the active material layer above the electrode sheet falls off and is damaged, indicating that during the liquid injection process of the battery, the electrolyte will impact the upper surface of the battery cell, and the blocking part does not protect the battery cell well.

[0050] In Comparative Examples 7-15, during the liquid injection of the battery, the liquid injection time is greater than the specified designed time. After the battery is disassembled, the upper surface of the battery cell is intact without damage. Since the amount of electrolyte flowing into the battery during liquid injection is small, the impact on the battery cell is small, but at the same time, it will increase the liquid injection time and affect the production efficiency.

[0051] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and substitutions can be made, and these improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A battery having a first direction and a second direction perpendicular to each other, characterized in that, Comprising: A housing having a liquid injection hole formed on one side in a first direction; A battery cell disposed within the housing; An insulating plate disposed on the side of the housing where the liquid injection hole is formed, the insulating plate having a liquid passing hole corresponding to the liquid injection hole, the first direction being perpendicular to the insulating plate; A blocking member disposed on the side of the insulating plate facing away from the liquid injection hole, and the blocking member corresponding to the liquid passing hole, the blocking member including a hollow connecting portion and a blocking plate, one end of the connecting portion being connected to the insulating plate, the other end of the connecting portion being connected to the blocking plate, the projection of the liquid injection hole in the first direction being located within the projection of the blocking plate in the first direction, the connecting portion having an opening penetrating through the inside and outside, the liquid injection hole, the liquid passing hole, and the opening forming a liquid injection channel; Among them, the area of the projection of the baffle in the first direction is S1, unit: mm 2 , the area of the projection of the liquid injection hole in the first direction is S2, unit: mm 2 , the distance between the baffle and the insulating plate is h, unit: mm, 0.01 ≤ (S2 / S1) * h ≤ 9.

2. The battery according to claim 1, characterized in that, 20mm 2 ≤S1≤180mm 2 。 3. The battery according to claim 1, wherein, 2mm 2 ≤S2≤20mm 2 。 4. The battery according to claim 1, characterized in that, 1mm ≤ h ≤ 9mm.

5. The battery according to any one of claims 1-4, characterized in that, One end of the opening in the first direction extends to the insulating plate, and there is a distance between the other end of the opening in the first direction and the blocking plate, 5 ≤ (S2 / S1) * h ≤ 9.

6. The battery according to any one of claims 1-4, characterized in that, One end of the opening in the first direction extends to the blocking plate, and there is a distance between the other end of the opening in the first direction and the insulating plate, 0.01 ≤ (S2 / S1) * h ≤ 3.

7. The battery according to any one of claims 1-4, characterized in that, One end of the opening in the first direction extends to the insulating plate, and the other end of the opening in the first direction extends to the blocking plate, 0.1 ≤ (S2 / S1) * h ≤ 6.

8. The battery according to claim 7, characterized in that, One said opening is provided on the said connecting part, and the area of the said opening is K1, unit: mm 2 , and the area of the outer side surface of the said connecting part is K2, unit: mm 2 , wherein, 0.3 ≤ K1 / K2 ≤ 0.

7.

9. The battery according to claim 7, wherein, A plurality of the openings are formed in the connecting portion, and the total area of the plurality of openings is K3, in square millimeters 2 , and the area of the outer side surface of the connecting portion is K2, in square millimeters 2 , wherein 0.5 ≤ K3 / K2 ≤ 0.

8.

10. The battery according to claim 1, characterized in that, The connecting portion is perpendicularly disposed on one side of the insulating plate in the first direction.

11. The battery according to claim 1, characterized in that, The blocking plate and the insulating plate are arranged parallel to each other.

12. The battery according to claim 8, wherein The connection line between the two ends of the opening in the vertical first direction projects onto the baffle in the first direction, so as to divide the surface of the baffle in the first direction into a first region and a second region. The area of the first region is M1, unit: mm 2 , and the area of the second region is M2, unit: mm 2 , where 1 / 3 ≤ M1 / M2 ≤ 2 / 3.

13. The battery according to claim 8, characterized in that, On the side of the housing where the liquid injection hole is formed, two pole columns are provided at intervals in a second direction, the blocking member is located between the two pole columns, and the opening on the connecting portion faces the pole column farthest from it and / or faces the center of the side of the housing where the liquid injection hole is formed.

14. The battery according to claim 1, characterized in that, A sinking groove is formed on the side of the housing facing away from the insulating plate, the depth of the sinking groove in the first direction is L, in mm, the liquid injection hole is provided at the bottom of the sinking groove, wherein, 0.5mm ≤ L ≤ 1.5mm, 0.2 ≤ (S2 / S1) * h ≤ 9.

15. The battery according to claim 1, characterized in that, A pole column is provided on the side of the housing where the liquid injection hole is formed, a pole tab is provided on the side of the battery cell facing the insulating plate, the pole tab is electrically connected to the pole column, in the first direction, the distance between the battery cell and the blocking plate is E, in mm, wherein, 0.2mm ≤ E ≤ 1.5mm.

16. The battery according to claim 1, characterized in that, It further includes a connecting piece disposed within the housing, a pole column is provided on the side of the housing where the liquid injection hole is formed, pole tabs are provided on both sides of the battery cell in the second direction, the pole tabs are electrically connected to the pole column through the connecting piece, the distance between the top of the battery cell and the blocking plate is D, in mm, wherein, 0.5mm ≤ D ≤ 2mm.

17. The battery according to claim 1, wherein The housing includes a housing body and a cover plate, the housing body has an installation opening on one side in the first direction, the cover plate is covered at the installation opening, the cover plate is provided with the liquid injection hole, and the insulating plate is located on the side of the cover plate facing the inside of the housing body.

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