battery

Abstract

The application discloses a battery, comprising a shell, an electric core, an insulating plate and a blocking piece, the shell is provided with a liquid injection hole on one side in a first direction, the electric core is arranged in the shell, the insulating plate is arranged on the side of the shell where the liquid injection hole is arranged, and a liquid passing hole is arranged on the insulating plate. The blocking piece is arranged on the side of the insulating plate opposite to the liquid injection hole, the blocking piece 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 blocking 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 blocking plate and the insulating plate is h, the unit is mm, and 0.01<= (S2 / S1)*h<=9. The application ensures the performance of the battery, the efficiency of liquid injection and the reliability of the blocking piece.

Description

Technical Field

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

[0002] With the increasing development of the new energy industry, power batteries, as key components of the new energy industry, have received more and more attention in their research and development.

[0003] The power battery includes a shell, a cover assembly and a battery cell. The battery cell is arranged in the shell, and the cover assembly is arranged on the upper part of the shell. The cover assembly is provided with a liquid injection port connected to the shell. When the power battery is injected, the electrolyte enters the shell from the liquid injection port. Under the action of gravity, the electrolyte directly impacts the electrode and diaphragm of the battery cell downward, which can easily cause the electrode to fall off and lithium precipitation, and can also easily cause the diaphragm to wrinkle, resulting in insulation failure, affecting 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:

[0006] A battery having a first direction and a second direction perpendicular to each other, comprising:

[0007] The housing has a liquid injection hole formed on one side thereof in the first direction;

[0008] a battery cell, which is disposed in the housing;

[0009] an insulating plate disposed on a side of the housing where the liquid injection hole is formed, the insulating plate being provided with a liquid passage hole corresponding to the liquid injection hole, wherein the first direction is a direction perpendicular to the insulating plate;

[0010] a blocking member disposed on a side of the insulating plate facing away from the liquid injection hole, the blocking member corresponding to the liquid passage hole, the blocking member comprising 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 extending through the inside and outside, the liquid injection hole, the liquid passage hole, and the opening forming a liquid injection channel;

[0011] The projection area of ​​the blocking plate in the first direction is S1, in mm. 2 The projection area of ​​the injection hole in the first direction is S2, in mm 2 The distance between the blocking plate and the insulating plate is h, in mm, 0.01≤(S2 / S1)*h≤9.

[0012] Compared with the prior art, the battery according to the embodiment of the present invention has the following advantages:

[0013] In the present invention, during the electrolyte injection process of 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, which may easily cause the diaphragm of the battery cell to wrinkle, thereby affecting its insulation effect, or easily cause the electrode of the battery cell to be damaged and fall off, thereby affecting the battery performance. Therefore, the present invention provides a blocking member on the insulating plate, the blocking member includes a connecting part and a blocking plate, the connecting part is hollow, one end of the connecting part is connected to the insulating plate, the insulating plate is provided with a liquid hole, the liquid hole connects the injection hole and the interior of the connecting part, the other end of the connecting part is provided with the blocking plate to close the connecting part, and the connecting part is provided with an opening connecting the inside and the outside, so that after the electrolyte is injected from the injection hole, the blocking plate can block the electrolyte and allow the electrolyte to flow out from the opening, thereby preventing the electrolyte from directly flushing the battery cell downward, thereby ensuring the performance of the battery. Then, by maintaining 0.01≤(S2 / S1)*h≤9, the electrolyte injection efficiency can be ensured while avoiding excessive impact force of the electrolyte, which may cause deformation and damage to the blocking member. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic diagram of a cover plate of a battery according to an embodiment of the present invention;

[0015] Figure 2 is another schematic diagram of a cover plate of a battery according to an embodiment of the present invention;

[0016] Figure 3 yes Figure 2 A magnified view of point A in the figure;

[0017] Figure 4 is a cross-sectional view of a cover plate according to an embodiment of the present invention;

[0018] Figure 5 yes Figure 4 Enlarged view of point B in FIG.

[0019] Figure 6 1 is another schematic diagram of a cover plate according to an embodiment of the present invention;

[0020] Figure 7 yes Figure 6 Enlarged view of point C in the figure;

[0021] Figure 8 1 is a schematic diagram of a battery according to one embodiment of the present invention;

[0022] Figure 9 Schematic diagram of a battery according to another embodiment of the present invention.

[0023] In the figure, 1. cover plate; 11. liquid injection hole; 12. sink; 2. blocking member; 21. connection part; 22. blocking plate; 23. opening; 24. first area; 25. second area; 3. pole; 4. shell; 5. battery cell; 6. tab; 7. adapter; 8. insulating plate; 81. liquid hole. DETAILED DESCRIPTION

[0024] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0025] In the description of the present invention, it should be understood that the term "comprising" as used in the present specification refers to the presence of the stated features, integers, steps, operations, parts / components, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, parts / components, components, and / or groups thereof. It should be understood that when we refer to a part / component as being "connected" to another part / component, it can be directly connected to the other part / component, or there can be intermediate parts / components. The term "and / or" as used herein includes all or any one of the associated listed items and all combinations thereof.

[0026] like Figures 1 to 9 As shown, the present invention relates to a battery having a first direction and a second direction perpendicular to each other, comprising a shell, a battery cell 5, an insulating plate 8 and a blocking member 2, wherein the shell is provided with a liquid injection hole 11 on one side in the first direction, the battery cell 5 is arranged in the shell, the insulating plate 8 is provided on the side of the shell where the liquid injection hole 11 is provided, and a liquid passage hole 81 corresponding to the liquid injection hole 11 is provided on the insulating plate 8, the first direction is a direction 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.

[0027] The blocking member 2 is arranged on the side of the insulating plate 8 facing away from the liquid injection hole 11, and the blocking member 2 corresponds to the liquid passage 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 to 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 that passes through the inside and outside. The liquid injection hole 11, the liquid passage hole 81 and the opening 23 form a liquid injection channel.

[0028] The projection area of ​​the blocking plate 22 in the first direction is S1 mm. 2 The projection area of ​​the injection hole 11 in the first direction is S2mm 2The distance between the blocking plate 22 and the insulating plate 8 is h mm, and 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.

[0029] In the present invention, during the electrolyte injection process of 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, which may easily cause the diaphragm of the battery cell 5 to wrinkle, thereby affecting its insulation effect, or easily cause the electrode of the battery cell 5 to be damaged and fall off, thereby affecting the battery performance. Therefore, the present invention provides a blocking member 2 on the insulating plate 8, and the blocking member 2 includes a connecting portion 21 and a blocking plate 22. The connecting portion 21 is hollow, and one end of the connecting portion 21 is connected to the insulating plate 8. The insulating plate 8 is connected to the battery cell 5. The insulating plate 8 has a liquid passage hole 81 that connects the injection hole 11 and the interior of the connecting portion 21. The other end of the connecting portion 21 is provided with a blocking plate 22 to seal the connecting portion 21. The connecting portion 21 has an opening 23 that connects the inside and outside. After the electrolyte is injected from the injection hole 11, the blocking plate 22 blocks the electrolyte and allows it to flow out through the opening 23, preventing the electrolyte from directly flushing the battery cell 5 and ensuring battery performance. Furthermore, by maintaining 0.01 ≤ (S2 / S1) * h ≤ 9, the electrolyte injection efficiency is ensured while preventing excessive impact force from the electrolyte, which could cause deformation and damage to the blocking member 2.

[0030] 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 is at a distance from the blocking plate 22, 5≤(S2 / S1)*h≤9; so that when the electrolyte is injected, the electrolyte will first remain in the connecting portion 21, thereby buffering the subsequently injected electrolyte and reducing the impact on the blocking member 2, while maintaining 5≤(S2 / S1)*h≤9 to ensure the injection efficiency.

[0031] 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; so that the electrolyte injected into the connecting portion 21 can be quickly ejected from the opening 23, thereby improving the injection efficiency of the electrolyte. At the same time, 0.01≤(S2 / S1)*h≤3 is maintained to reduce the risk of deformation and damage of the blocking member 2.

[0032] 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 maintains 0.1≤(S2 / S1)*h≤6, thereby improving the injection efficiency and ensuring the reliability of the blocking member 2.

[0033] In some embodiments, the connecting portion 21 is provided with an opening 23, and the area of ​​the opening 23 is K1, in mm. 2 The area of ​​the outer side surface of the connecting portion 21 is K2, in mm 2 , where 0.3≤K1 / K2≤0.7. K1 / K2 can also be 0.33, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6 or 0.65.

[0034] The area of ​​the opening 23 affects the flow rate of the electrolyte and also the structural strength of the barrier 2. When K1 / K2 is too small, the opening 23 is too small, resulting in low injection efficiency. When K1 / K2 is too large, the opening 23 is too large, weakening the structural strength of the connection portion 21 and the overall strength of the barrier 2. By maintaining 0.3≤K1 / K2≤0.7, both injection efficiency and the overall strength of the barrier 2 can be ensured.

[0035] In some embodiments, the connecting portion 21 is provided with a plurality of openings 23 , and the total area of ​​the plurality of openings 23 is K3, in mm. 2 The area of ​​the outer side surface of the connecting portion 21 is K2, in mm 2 , where 0.5≤K3 / K2≤0.8. 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.

[0036] The side wall of the connecting portion 21 is provided with a plurality of openings 23, so as to facilitate more uniform distribution of the electrolyte on the battery cell 5, and the force of flushing the battery cell 5 is weaker to avoid affecting the performance of the battery; by maintaining 0.5≤K3 / K2≤0.8, the efficiency of the liquid injection can be ensured, and the overall structural strength of the barrier 2 can be ensured, thereby ensuring the reliability of the barrier 2.

[0037] Preferably, the plurality of openings 23 are located in an area on one side of the connecting portion 21 facing the outer shell in the length direction, that is, the plurality of openings 23 are located in an area of ​​the connecting portion 21 facing the wide side of the outer shell, so that the electrolyte is mainly sprayed out along the length direction of the outer shell, so that the electrolyte does not impact the inner side wall of the long side of the battery, and impacts the battery cell 5 downward along the inner side wall of the battery, thereby avoiding damage to the battery cell 5.

[0038] In some embodiments, the connecting part 21 is arranged perpendicularly to one side of the insulating plate 8 in the first direction, so as to facilitate manufacturing and ensure the reliability of the blocking piece 2 structure.

[0039] In some embodiments, the blocking plate 22 is arranged parallel to the insulating plate 8, so as to also ensure the reliability of the blocking piece 2 structure.

[0040] In some embodiments, the line between the two ends of the opening 23 in the vertical first direction is projected on the blocking plate 22 in the first direction, so as to divide the surface of the blocking plate 22 in the first direction into a first area 24 and a second area 25, the area of the first area 24 is M1, unit mm 2 , and the area of the second area 25 is M2, unit mm 2 , wherein 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.

[0041] Specifically, the line between the two ends of the opening 23 in the horizontal direction is projected on the blocking plate 22 in the height direction of the battery, so that the area on one side of the line on the plane of the blocking plate 22 forms the first area 24, and the area on the other side of the line forms the second area 25. M1 and M2 reflect the size of the opening 23 occupying the side wall of the connecting part 21, so 1 / 3≤M1 / M2≤2 / 3 is maintained, so as to ensure the injection efficiency and the reliability of the blocking piece 2, and also reduce the influence on the battery cell 5 during injection.

[0042] In some embodiments, the shell is provided with two pole columns 3 spaced apart in the second direction on the side where the injection hole 11 is arranged, in the first direction, one end of the pole column 3 penetrates through the insulating plate 8 to the inside of the shell, the other end of the pole column 3 penetrates to the outside of the shell, the blocking piece 2 is located between the two pole columns 3, and the opening 23 on the connecting part 21 is directed towards the pole column 3 farthest from it and / or towards the center of the side of the shell where the injection hole 11 is arranged.

[0043] When the opening 23 of the connecting portion 21 is directed toward the pole 3 farthest away from it, the electrolyte can be sprayed from the opening 23 toward the length direction of the shell during the injection process, and the electrolyte cannot be sprayed onto the pole 3, so the electrolyte will not impact the welding position between the pole 3 and the battery core 5, and will not affect the electrical connection between the pole 3 and the battery core 5; when the opening 23 of the connecting portion 21 is directed toward the center of the side of the shell where the injection hole 11 is opened, the opening 23 of the connecting portion 21 will not face the pole 3, so when the electrolyte is sprayed from the opening 23, most of the electrolyte will not impact the pole 3, and will not affect the electrical connection between the pole 3 and the battery core 5.

[0044] In some embodiments, maintain 20 mm 2 ≤S1≤180mm 2 , to ensure the efficiency of liquid injection and the structural strength of the barrier 2. The value of S1 can also be 30mm 2 , 40mm 2 , 50mm 2 , 60mm 2 , 70mm 2 , 80mm 2 , 90mm 2 , 100mm 2 , 110mm 2 , 120mm 2 , 130mm 2 , 140mm 2 , 150mm 2 , 160mm 2 or 170mm 2 .

[0045] In some embodiments, maintain 2 mm 2 ≤S2≤20mm 2 To ensure the efficiency of liquid injection and prevent the deformation and damage of the barrier 2. The value of S2 can also be 3mm 2 , 5mm 2 , 8mm 2 , 10mm 2 , 13mm 2 , 15mm 2 , 17mm 2 or 19mm 2 .

[0046] In some embodiments, 1 mm ≤ h ≤ 9 mm is maintained to ensure injection efficiency and prevent deformation and damage of the barrier 2. The value of h may also be 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, or 8 mm.

[0047] In some embodiments, the shell is provided with a sink groove 12 on the side opposite to the insulating plate 8, the depth of the sink groove 12 in the first direction is L, unit: mm, the liquid injection hole 11 is arranged at the bottom of the sink groove 12, wherein 0.5mm≤L≤1.5mm, 0.2≤(S2 / S1)*h≤9. L can also be 0.6mm, 0.8mm, 1mm, 1.2mm, 1.3mm or 1.4mm.

[0048] By setting the sink groove 12 and keeping 0.5mm≤L≤1.5mm, 0.2≤(S2 / S1)*h≤9, on the one hand, it is convenient to inject electrolyte, on the other hand, it can reduce the distance of electrolyte reaching the blocking piece 2 when injecting, so as to reduce the impact force and avoid deforming or damaging the blocking piece 2.

[0049] In some embodiments, the shell is provided with a pole 3 on the side where the liquid injection hole 11 is arranged, in the first direction, one end of the pole 3 penetrates through the insulating plate 8 to the inside of the shell, the other end of the pole 3 penetrates to the outside of the shell, the positive plate 5 is provided with a tab 6 on the side opposite to the insulating plate 8, the tab 6 is electrically connected with the pole 3, in the first direction, the distance between the positive plate 5 and the blocking plate 22 is E, unit: mm, wherein 0.2mm≤E≤1.5mm. E can also be 0.3mm, 0.5mm, 0.7mm, 0.8mm, 1mm, 1.2mm or 1.4mm.

[0050] In the use process of the battery, the positive plate 5 will expand, if the distance between the positive plate 5 and the blocking plate 22 is too close, the expanded positive plate 5 is easy to hit the blocking plate 22, causing damage to the positive plate 5; in addition, if the distance between the positive plate 5 and the blocking plate 22 is too far, the size of the positive plate 5 is too small, causing waste of the internal space of the battery. Therefore, by keeping 0.2mm≤E≤1.5mm, the positive plate 5 will not hit the blocking plate 22 in the use process of the battery, and the utilization rate of the internal space of the battery is not affected.

[0051] In some embodiments, the battery further comprises a switching piece 7 arranged in the shell, the shell is provided with a pole 3 on the side where the liquid injection hole 11 is arranged, in the first direction, one end of the pole 3 penetrates through the insulating plate 8 to the inside of the shell, the other end of the pole 3 penetrates to the outside of the shell, the positive plate 5 is provided with a tab 6 on both sides in the length direction, the tab 6 is electrically connected with the pole 3 through the switching piece 7, the distance between the top of the positive plate 5 and the blocking plate 22 is D, unit: mm, wherein 0.5mm≤D≤2mm. D can also be 0.6mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 1.7mm or 1.9mm.

[0052] During battery use, the cell 5 expands. If the cell 5 is too close to the barrier plate 22, the expanded cell 5 can easily hit the barrier plate 22, causing damage to the cell 5. Furthermore, if the cell 5 is too far from the barrier plate 22, the cell 5 will be too small, resulting in a waste of internal battery space. Therefore, by maintaining 0.5 mm ≤ D ≤ 2 mm, the cell 5 will not hit the barrier plate 22 during battery use, and the utilization of the internal battery space will not be affected.

[0053] In some embodiments, the housing includes a shell 4 and a cover plate 1, the shell 4 is provided with a mounting opening on one side in the first direction, the cover plate 1 is covered at the mounting opening, the insulating plate 8 is located on the side of the cover plate 1 facing the shell 4, and the injection hole 11, the pole 3, and the sink 12 are all located on the cover plate 1.

[0054] In order to further illustrate the effects of the present invention, the present invention provides the following test method:

[0055] A batch of battery models with the same specifications were used as test objects. The relevant parameters of the corresponding filling holes and blocking parts on the cover of each battery were different. The batteries were subjected to filling tests using conventional filling equipment on the production line.

[0056] Injection volume: 1000g;

[0057] Injection pressure: 0.6 MPa;

[0058] Injection time: less than or equal to 23 minutes;

[0059] Judgment: Under the predetermined injection pressure, if all the preset electrolyte in the injection equipment is injected into the battery within 23 minutes, it is judged as qualified. Otherwise, if the injection time exceeds 23 minutes, it is judged as unqualified.

[0060] Disassemble the battery after injection and observe the battery electrode condition to see if there are wrinkles on the top diaphragm of the cell or electrode falling off.

[0061] The specific test data are shown in the following table:

[0062]

[0063] In Examples 1 to 22, the test batteries were able to complete the injection process within the designed specified time. After the batteries were disassembled, the top of the battery cell was normal, the diaphragm had no wrinkles, and the electrode pieces did not fall off. This shows that the impact of the electrolyte on the top of the battery cell was small, but the injection could be completed within the normal time.

[0064] In Examples 23 to 45, the injection time and battery disassembly during the test process met the design requirements, but other process problems occurred during the test process.

[0065] In Examples 23, 24, 25, 42 and 43, since the area of ​​the barrier plate is small, the range of outward diffusion of the electrolyte after contacting the barrier plate is small. After the battery is disassembled, residual electrolyte is found in the shell, indicating that some battery cells are not completely soaked in the electrolyte. Although a long time of static soaking is required during the battery manufacturing process, when the barrier plate area is small, the electrolyte soaking time will be indirectly increased, thereby lengthening the production cycle.

[0066] In Examples 26, 27, 28, 29, 44 and 45, since the blocking plate has a large area and occupies more space inside the battery, the tabs of some batteries are likely to interfere with the blocking member during assembly, causing the tabs to bend, affecting the overcurrent during battery use.

[0067] In Examples 30, 31, 31, 42, 43 and 44, since the aperture of the injection hole is too small, leakage occurs during injection, and part of the electrolyte spills onto the surface of the battery cover, and even spills onto the explosion-proof valve and the pole, causing corrosion and affecting the safety performance of the battery.

[0068] In Examples 33, 34, 35 and 45, since the aperture of the injection hole is relatively large, a sealing pin with a larger diameter needs to be used when sealing the injection hole after injection. However, the larger the sealing area, the greater the risk of sealing failure, which affects the safety performance of the battery during use.

[0069] In Examples 36, 37, 38 and 42, due to the shorter connection portion, the blocking plate is closer to the cover plate. When the injection hole is sealed, the sealing pin will abut the blocking plate, which may cause process problems such as sealing failure of the sealing pin and damage of the blocking plate falling into the battery cell.

[0070] In Examples 39, 40, 41, 43, 44 and 45, since the connecting portion is long and the strength of the connecting portion is relatively poor, there is a risk of deformation and damage of the connecting portion during the injection process. At the same time, the long connecting portion causes the blocking plate to be closer to the top of the battery cell. After the battery cell is injected with liquid and left to stand, it will expand during the charging and discharging process, and there is a situation where the battery cell abuts the blocking plate, causing damage to the electrode, posing a safety hazard.

[0071] In Comparative Examples 1 to 6, although the battery can complete the injection process within the design required time, after the battery is disassembled, it was found that the cell diaphragms on the top of the battery cell were deformed and wrinkled, and part of the active material layer above the electrode fell off and was damaged, indicating that during the battery injection process, the electrolyte will impact the upper surface of the battery cell, and the barrier component does not provide good protection for the battery cell.

[0072] In Comparative Examples 7 to 15, the injection time during battery injection was longer than the prescribed design time. After the battery was disassembled, the upper surface of the battery cell was intact and undamaged. Since the amount of electrolyte flowing into the battery during injection was small, the impact on the battery cell was small. However, this increased the injection time and affected production efficiency.

[0073] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A battery having a first direction and a second direction perpendicular to each other, characterized in that: include: The housing has a liquid injection hole formed on one side thereof in the first direction; a battery cell, which is disposed in the housing; an insulating plate disposed on a side of the housing where the liquid injection hole is formed, the insulating plate being provided with a liquid passage hole corresponding to the liquid injection hole, wherein the first direction is a direction perpendicular to the insulating plate; a blocking member disposed on a side of the insulating plate facing away from the liquid injection hole, the blocking member corresponding to the liquid passage hole, the blocking member comprising 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 extending through the inside and outside, the liquid injection hole, the liquid passage hole, and the opening forming a liquid injection channel; The connecting portion is provided with an opening, and a line connecting two ends of the opening in a perpendicular first direction is projected onto the blocking plate along the first direction to divide the surface of the blocking plate in the first direction into a first area and a second area. The area of ​​the first area is M1, in mm. 2 The area of ​​the second region is M2, in mm 2 , where 1 / 3≤M1 / M2≤2 / 3; The projection area of ​​the blocking plate in the first direction is S1, in mm. 2 The projection area of ​​the injection hole in the first direction is S2, in mm 2 The distance between the blocking plate and the insulating plate is h, in 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, characterized in that 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 to 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 is spaced apart from the blocking plate by a distance of 5≤(S2 / S1)*h≤9.

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

7. The battery according to any one of claims 1 to 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, and 0.1≤(S2 / S1)*h≤6.

8. The battery according to claim 7, characterized in that The area of ​​the opening is K1, in mm 2 The area of ​​the outer side of the connecting portion is K2, in mm 2 , where 0.3≤K1 / K2≤0.

7.

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

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

11. The battery according to claim 8, characterized in that Two poles are provided at intervals along the second direction on one side of the shell where the liquid injection hole is provided, the blocking member is located between the two poles, and the opening on the connecting portion faces the pole farthest away from it and / or faces the center of the side of the shell where the liquid injection hole is provided.

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

13. The battery according to claim 1, characterized in that A pole is provided on the side of the shell where the liquid injection hole is opened, and a pole ear is provided on the side of the battery cell facing the insulating plate, and the pole ear is electrically connected to the pole. In the first direction, the distance between the battery cell and the blocking plate is E, in mm, where 0.2mm≤E≤1.5mm.

14. The battery according to claim 1, characterized in that It also includes an adapter plate arranged in the shell, a pole is provided on one side of the shell where the liquid injection hole is opened, and pole ears are provided on both sides of the battery cell in the second direction, and the pole ears are electrically connected to the pole through the adapter plate. The distance between the top of the battery cell and the blocking plate is D, in mm, where 0.5mm≤D≤2mm.

15. The battery according to claim 1, characterized in that The shell includes a shell and a cover plate. The shell is provided with a mounting opening on one side in the first direction. The cover plate is covered at the mounting opening. The liquid injection hole is opened on the cover plate. The insulating plate is located on the side of the cover plate facing the shell.

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