Battery

Abstract

The utility model belongs to the technical field of batteries, and particularly discloses a battery, which comprises a battery cover plate, a shell and a plastic part, a first liquid injection hole is arranged on the battery cover plate or the shell, and the plastic part is positioned on one side of the battery cover plate or the shell. The plastic part comprises a plastic part body and a supporting part which are connected with each other, and a second liquid injection hole communicated with the first liquid injection hole is formed in the plastic part body. The supporting part comprises a first boss and at least two second bosses, a third liquid injection hole communicated with the second liquid injection hole is formed in the first boss, and the at least two second bosses are arranged in the circumferential direction of the third liquid injection hole and arranged on the end face of the side, away from the plastic part body, of the first boss at intervals; a circulation channel communicated with the third liquid injection hole is formed between every two adjacent second bosses. Through the arrangement of the supporting part, the insulating tape can be well supported, a circulation space is kept between the plastic part and the insulating tape, electrolyte injection is smooth, the electrolyte injection efficiency is high, and vacuumizing is easy to achieve.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery. Background Technology

[0002] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage. As an accessory of lithium-ion batteries, the battery cover assembly firstly seals the internal and external environments by welding it to the casing, and secondly connects the internal and external circuits, guiding the internal current of the battery to the outside through the terminals of the battery cover assembly. A traditional battery cover assembly generally includes a battery cover, terminals, an upper plastic component, and a lower plastic component. After the battery cover is welded to the casing, a closed space is formed between the battery cover and the casing. The electrode assembly is placed within this closed space, and the electrode assembly has tabs that are electrically connected to the terminals via connecting pieces.

[0003] Generally, the battery cover and lower plastic component have injection holes for injecting electrolyte into the casing. During the injection process, the casing needs to be evacuated intermittently through the injection holes to ensure smooth electrolyte injection and that the injection volume meets requirements. To make better use of the space on the battery cover, the injection holes on the lower plastic component may be located above the connection area between the connecting piece and the electrode tab. The connection area between the connecting piece and the electrode tab is covered with insulating tape. When injecting electrolyte or evacuating, the insulating tape may adhere to the end face of the lower plastic component facing the electrode assembly, causing blockage of the injection holes, slowing down the injection rate, and affecting production efficiency. Utility Model Content

[0004] The purpose of this utility model is to provide a battery in which a support part is provided on the plastic part to support the insulating tape, thereby preventing the insulating tape from blocking the second liquid injection hole on the plastic part, ensuring smooth electrolyte flow, and achieving high liquid injection efficiency and vacuuming efficiency.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] This utility model provides a battery, comprising:

[0007] Battery cover;

[0008] The housing is connected to and encloses the battery cover to form a receiving cavity, and one of the battery cover and the housing is provided with a first liquid injection hole;

[0009] A plastic part includes a plastic part body and a support portion. The plastic part body is disposed on the side of the battery cover or the housing near the receiving cavity. The support portion is disposed on the side of the plastic part body near the receiving cavity. The plastic part body is provided with a second injection hole that communicates with the first injection hole.

[0010] The support portion includes a first boss and at least two second bosses. The first boss is connected to the plastic body circumferentially to the second injection hole, and the first boss is provided with a third injection hole communicating with the second injection hole. At least two second bosses are arranged circumferentially to the third injection hole and are spaced apart on the end face of the first boss away from the plastic body. A flow channel is formed between two adjacent second bosses, and the flow channel communicates with the third injection hole.

[0011] The sum of the areas of the end faces of all the second protrusions facing the cavity is S, and the value of S is within the range of 5mm. 2 ≤S≤50mm 2 .

[0012] Optionally, the first injection hole is disposed on the battery cover plate, and an annular boss is provided on the end face of the battery cover plate near the plastic body. The annular boss is located around the first injection hole, and a groove is provided on the end face of the plastic body facing the battery cover plate, and the annular boss is accommodated in the groove.

[0013] Optionally, the annular boss is circular, and the wall of the sink includes an arc-shaped wall surface, which mates with the peripheral sidewall of the annular boss.

[0014] Optionally, the battery further includes an electrode assembly disposed within the accommodating cavity, and a clamping part is provided on the side of the plastic body opposite to the battery cover, the clamping part abutting against the electrode assembly;

[0015] Along the first direction, the distance between the end face of the second boss facing the electrode group and the end face of the plastic body facing the electrode group is h1, and the distance between the end face of the pressing part facing the electrode group and the end face of the plastic body facing the electrode group is h2, where h1 < h2.

[0016] The value range of h1 is: 0.8mm≤h1≤8mm;

[0017] The value range of h2 is: 1.5mm≤h2≤16mm.

[0018] Optionally, the plastic body has an exhaust section on the side away from the battery cover, the exhaust section has multiple air holes, the battery cover has a burst hole, the burst hole has an explosion-proof valve, and the air hole connects the accommodating cavity with the pressure relief channel after the explosion-proof valve is opened;

[0019] Along the first direction, the distance between the end face of the exhaust section facing the electrode group and the end face of the plastic body facing the electrode group is h3, where h1 < h3 ≤ h2;

[0020] The value range of h3 is: 1.5mm≤h3≤16mm.

[0021] Optionally, the plastic body is provided with a reinforcing rib on the side opposite to the battery cover, and the reinforcing rib is located in the circumferential direction of the support portion;

[0022] Along the first direction, the distance between the end face of the reinforcing rib facing the pole group and the end face of the plastic body facing the pole group is h4, h4 < h1;

[0023] The value of h4 is in the range of 0.4mm ≤ h4 ≤ 5mm.

[0024] Optionally, along the first direction, the height of the first boss is h11, and the height of the second boss is h12, where h1 = h11 + h12;

[0025] The value range of h11 is: 0.5mm≤h11≤5mm;

[0026] The value range of h12 is: 0.3mm≤h12≤3mm.

[0027] Optionally, two second protrusions are provided, and the two second protrusions are respectively provided on opposite sides of the third injection hole along the second direction;

[0028] Alternatively, the two second protrusions are respectively disposed on opposite sides of the third injection hole along a third direction.

[0029] Optionally, the plastic body includes a first portion and a second portion, with the second injection hole and the support portion disposed in the first portion.

[0030] Optionally, the battery further includes a sealing assembly that seals the first injection hole.

[0031] The beneficial effects of this utility model are as follows:

[0032] This utility model provides a battery, including a battery cover, a housing, and a plastic part. The battery cover and housing form a receiving cavity. The battery cover or housing has a first electrolyte injection hole, and the plastic part is located on the side of the battery cover / housing near the receiving cavity. The plastic part includes a plastic part body and a support portion. The support portion is located on the side of the plastic part body near the receiving cavity, and the plastic part body has a second electrolyte injection hole communicating with the first electrolyte injection hole. The support portion includes a first boss and at least two second bosses. The first boss is connected to the plastic part body circumferentially to the second electrolyte injection hole, and the first boss has a third electrolyte injection hole communicating with the second electrolyte injection hole. The at least two second bosses are located circumferentially to the third electrolyte injection hole and are spaced apart on the end face of the first boss away from the plastic part body. A flow channel is formed between two adjacent second bosses, and the flow channel communicates with the third electrolyte injection hole. The support portion provides good support for the insulating tape, maintains a flow space between the plastic part and the insulating tape, and the flow space communicates with the flow channel, ensuring smooth electrolyte injection, high injection efficiency, and easy vacuuming. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0034] Figure 1 This is a structural schematic diagram of the battery cover and plastic part provided in Embodiment 1 of this utility model;

[0035] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0036] Figure 3 This is a schematic diagram of the structure of the first part of the plastic part provided in Embodiment 1 of this utility model;

[0037] Figure 4 yes Figure 3 A magnified view of a section at point B in the middle;

[0038] Figure 5 This is a top view of the battery provided in Embodiment 1 of this utility model;

[0039] Figure 6 yes Figure 5 Cross-sectional view of section CC;

[0040] Figure 7 yes Figure 6 A magnified view of a section at point D;

[0041] Figure 8 yes Figure 6 A magnified view of a section at point E in the middle.

[0042] In the picture:

[0043] 100. Battery cover; 110. First injection hole; 111. Recessed platform; 120. Annular boss; 130. Bursting hole; 140. Sealing assembly; 141. Sealing pin; 142. Sealing cap; 200. Housing; 300. Plastic part; 310. Plastic part body; 311. First section; 3111. Second injection hole; 3112. Recessed groove; 31121. Arc-shaped wall; 31122. Flat wall; 312. Second section; 320. Support part; 321. First boss; 3211. Third injection hole; 322. Second boss; 330. Pressing part; 340. Venting part; 341. Air hole; 350. Reinforcing rib; 400. Electrode group; 500. Explosion-proof valve; 600. Explosion-proof valve protective patch. Detailed Implementation

[0044] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not the entire structure.

[0045] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0046] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0047] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0048] Example 1

[0049] like Figure 1 , Figure 5 and Figure 6 As shown, this embodiment provides a battery, which includes a battery cover 100, a housing 200, an electrode assembly 400, and a plastic part 300. The battery cover 100 and the housing 200 together form a receiving cavity for mounting the electrode assembly 400 and the plastic part 300. The battery cover 100 is provided with a first liquid injection hole 110, and the plastic part 300 is sandwiched between the battery cover 100 and the electrode assembly 400.

[0050] The plastic part 300 includes a plastic part body 310 and a support part 320. The plastic part body 310 is disposed on the side of the battery cover 100 near the receiving cavity, and the support part 320 is disposed on the side of the plastic part body 310 near the receiving cavity. The plastic part body 310 is provided with a second injection hole 3111 communicating with the first injection hole 110. The support part 320 includes a first boss 321 and at least two second bosses 322. The first boss 321 is connected to the plastic part body 310 circumferentially to the second injection hole 3111, and the first boss 321 is provided with a third injection hole 3211 communicating with the second injection hole 3111. At least two second bosses 322 are disposed circumferentially to the third injection hole 3211 and are spaced apart on the end face of the first boss 321 facing away from the plastic part body 310. A flow channel is formed between two adjacent second bosses 322, and the flow channel communicates with the third injection hole 3211.

[0051] During vacuuming, the aforementioned support portion 320 provides excellent support for the insulating tape, while maintaining a flow space between the plastic body 310 and the electrode assembly 400. This flow space connects with the flow channel formed between the two adjacent second protrusions 322, ensuring that the electrolyte can flow into the battery's receiving cavity sequentially through the first injection hole 110, the second injection hole 3111, and the third injection hole 3211, resulting in smooth electrolyte injection. Even if the insulating tape covering the tabs of the electrode assembly 400 adheres to the end face of the second protrusion 322 near the electrode assembly 400, the electrolyte can still enter the receiving cavity through the flow channel formed between the two adjacent second protrusions 322. This prevents the insulating tape from blocking the first injection hole 110, the second injection hole 3111, and the third injection hole 3211, resulting in high electrolyte injection efficiency and easy vacuuming.

[0052] Furthermore, the sum of the areas of the end faces of all the second protrusions 322 facing the receiving cavity is S, and the value of S is within the range of 5mm. 2 ≤S≤50mm 2 For example, the value of S can be 5mm. 2 10mm 2 25mm 2 40mm 2 Or 50mm 2 By limiting the value of S within the above range, a larger contact area between the second protrusion 322 and the insulating tape is ensured, thereby providing good support for the insulating tape and preventing the insulating tape from obscuring the first injection hole 110, the second injection hole 3111, and the third injection hole 3211.

[0053] As an alternative, in this embodiment, the first boss 321 is a rectangular plate, and two second bosses 322 are provided. The two second bosses 322 are respectively arranged along the second direction (e.g., the third injection hole 3211). Figure 1 The opposite side (as shown in the X-axis direction).

[0054] Alternatively, the two second protrusions 322 can also be respectively set in the third injection hole 3211 along the third direction (e.g. Figure 1 The opposite side (as shown in the Y-axis direction) is used as an example in this embodiment. Each second boss 322 is elongated and extends along the length of the plastic body 310. The area of ​​the end face of each second boss 322 facing the receiving cavity is S1, where S = 2 × S1. By setting the second boss 322 to be elongated, the contact area between the second boss 322 and the insulating tape is increased, and it can also play a certain role in guiding the electrolyte.

[0055] Of course, in other embodiments, the shapes of the first protrusion 321 and the second protrusion 322 can be flexibly adjusted as needed, and the number of the second protrusions 322 can also be adjusted as needed, as long as there is a flow channel for the electrolyte to flow between two adjacent second protrusions 322.

[0056] See Figures 1-4 In this embodiment, an annular boss 120 is provided on the end face of the battery cover 100 near the plastic body 310. The annular boss 120 is located circumferentially to the first injection hole 110. A groove 3112 is provided on the end face of the plastic body 310 facing the battery cover 100, and the annular boss 120 is accommodated in the groove 3112. Through the cooperation of the annular boss 120 and the groove 3112, the battery cover 100 can be guided, making it easy for the annular boss 120 to be installed into the groove 3112. Furthermore, the cooperation of the annular boss 120 and the groove 3112 can also position the positional relationship between the plastic part 300 and the battery cover 100, ensuring high assembly accuracy between the plastic part 300 and the battery cover 100. In addition, the groove 3112 can also reduce the space occupied by the battery cover 100 and the plastic part 300 after assembly, which is beneficial to the miniaturization of the battery.

[0057] Optionally, in this embodiment, both the first injection hole 110 and the annular boss 120 are circular. The wall of the settling tank 3112 includes two arc-shaped wall surfaces 31121 and six flat wall surfaces 31122 arranged opposite each other along a second direction. The six flat wall surfaces 31122 are divided into two groups, with the two groups of flat wall surfaces 31122 facing each other along a third direction. Three flat wall surfaces 31122 in each group are connected in sequence and form a clearance space, which can accommodate the annular boss 120. The clearance space facilitates the disassembly and separation of the battery cover 100 and the plastic part 300. The arc-shaped wall surfaces 31121 cooperate with the peripheral sidewalls of the annular boss 120. Through the cooperation between the arc-shaped wall surfaces 31121 and the peripheral sidewalls of the annular boss 120, the above-mentioned guiding and positioning functions are achieved.

[0058] Of course, in other embodiments, the wall of the sink 3112 can also be set as an arc-shaped wall 31121 that is consistent with the shape of the peripheral sidewall of the annular boss 120. In this case, only one arc-shaped wall 31121 needs to be set. The arc-shaped wall 31121 and the peripheral sidewall of the annular boss 120 are fitted with a small gap. The above-mentioned guiding and positioning functions are achieved through the fit between the arc-shaped wall 31121 and the peripheral sidewall of the annular boss 120.

[0059] See also Figures 6-8The battery also includes an electrode assembly 400, which is disposed within the accommodating cavity. A clamping part 330 is provided on the side of the plastic body 310 opposite to the battery cover plate 100, and the clamping part 330 abuts against the electrode assembly 400. The clamping part 330 presses the electrode assembly 400 into the housing 200 to prevent the electrode assembly 400 from shaking and pulling on the tabs.

[0060] Further, along the first direction, the distance between the end face of the second boss 322 facing the electrode assembly 400 and the end face of the plastic body 310 facing the electrode assembly 400 is h1, and the distance between the end face of the clamping part 330 facing the electrode assembly 400 and the end face of the plastic body 310 facing the electrode assembly 400 is h2, where h1 < h2. The first direction is... Figure 6 The Z-axis direction is shown in the diagram. By ensuring h1 < h2, interference between the support 320 and the electrode assembly 400 is avoided, ensuring proper battery assembly. Optionally, the value range of h1 is: 0.8mm ≤ h1 ≤ 8mm. The value range of h2 is: 1.5mm ≤ h2 ≤ 16mm. For example, when h1 is 0.8mm, h2 can be 1.5mm, 2.0mm, etc. When h1 is 2mm, h2 can be 2.5mm, 3.0mm, or 5mm, etc. When h1 is 8mm, h2 can be 8.5mm, 10.0mm, or 16mm, etc.

[0061] Optionally, along the first direction, the height of the first boss 321 is h11, and the height of the second boss 322 is h12, where h1 = h11 + h12. The value of h11 is in the range of 0.5mm ≤ h11 ≤ 5mm. By ensuring that the value of h11 meets the above range, the mechanical strength of the first boss 321 is sufficient to stably fix the second boss 322. The value of h12 is in the range of 0.3mm ≤ h12 ≤ 3mm. By ensuring that the value of h12 is within the above range, the second boss 322 can provide good support for the insulating tape, and the flow area of ​​the flow channel formed between two adjacent second bosses 322 is large, ensuring a high electrolyte injection rate. Otherwise, if the value of h12 is too small, it cannot support the insulating tape well, and the second injection hole 3111 and the third injection hole 3211 may be blocked, resulting in low injection efficiency.

[0062] Furthermore, the plastic body 310 has an exhaust 340 on the side opposite to the battery cover 100, and the exhaust 340 has multiple air holes 341. The battery cover 100 has a burst hole 130, and an explosion-proof valve 500 is installed in the burst hole 130. Along the first direction, the projection of the explosion-proof valve 500 on the battery cover 100 coincides with the projection of the exhaust 340 on the battery cover 100. The air holes 341 connect the accommodating cavity with the pressure relief channel after the explosion-proof valve 500 is opened. This allows high-temperature and high-pressure gas to act on the explosion-proof valve 500 when the battery thermally runs away, causing it to open and release pressure, thereby ensuring battery safety and avoiding the risk of explosion.

[0063] Optionally, the battery cover 100 is provided with an explosion-proof valve protection patch 600 on the side opposite to the plastic body 310. Along the first direction, the projection of the explosion-proof valve protection patch 600 on the battery cover 100 can cover the projection of the rupture hole 130 on the battery cover 100, so that the explosion-proof valve protection patch 600 can shield the rupture hole 130, so that the explosion-proof valve protection patch 600 can protect the explosion-proof valve 500 and prevent electrolyte from flowing through the rupture hole 130 to the explosion-proof valve 500 and corroding the explosion-proof valve 500.

[0064] Along the first direction, the distance between the end face of the venting part 340 facing the electrode assembly 400 and the end face of the plastic body 310 facing the electrode assembly 400 is h3, where h1 < h3 ≤ h2. By ensuring that h1 < h3 ≤ h2, excessive pressure of the venting part 340 on the electrode assembly 400 is avoided, which could damage the electrode assembly 400 and ensure proper battery assembly. Optionally, the value of h3 can be in the range of 1.5mm ≤ h3 ≤ 16mm. For example, when h1 is 0.8mm and h2 is 2.0mm, h3 can be 1.5mm or 2.0mm, etc. When h1 is 2mm and h2 is 2.5mm, h3 can be 2.5mm, 2.0mm, or 1.5mm, etc. When h1 is 8mm and h2 is 16mm, h3 can be 10.0mm, 12mm, or 16mm, etc.

[0065] See also Figure 2 and Figure 7The plastic body 310 has crisscrossing reinforcing ribs 350 on the side opposite to the battery cover 100, and the reinforcing ribs 350 are located circumferentially in the support portion 320. The reinforcing ribs 350 improve the mechanical strength of the plastic body 310, making it less prone to bending and deformation. Along the first direction, the distance between the end face of the reinforcing rib 350 facing the electrode assembly 400 and the end face of the plastic body 310 facing the electrode assembly 400 is h4, where h4 < h1. The height of the reinforcing rib 350 should not be too high, otherwise it will not only waste material but also easily interfere with other structural components inside the battery (e.g., tabs, connecting pieces, etc.). Optionally, the value of h4 can range from 0.4mm ≤ h4 ≤ 5mm. For example, when h1 is 0.8mm, h4 can be 0.4mm, 0.5mm, or 0.6mm, etc. When h1 is 2mm, h4 can be 0.4mm, 0.8mm, or 1mm, etc. When h1 is 8mm, h4 can be 1mm, 2mm or 5mm, etc.

[0066] The battery also includes a sealing assembly 140, which seals the first injection hole 110. Exemplarily, the sealing assembly 140 includes a sealing pin 141 and a sealing cap 142. A countersunk platform 111 is provided on the side of the battery cover plate 100 opposite to the electrode assembly 400. The sealing pin 141 is pressed into the first injection hole 110 and engages with an annular boss 120. The sealing cap 142 is embedded in the countersunk platform 111 and welded to the side wall of the countersunk platform 111. The sealing pin 141 and the sealing cap 142 ensure a good seal for the first injection hole 110, resulting in good battery sealing performance.

[0067] See also Figure 1 and Figure 3 In this embodiment, the plastic body 310 includes a first portion 311 and a second portion 312. The second injection hole 3111 and the support portion 320 are disposed in the first portion 311. Since the plastic body 310 is relatively long along the second direction, and is typically integrally molded by injection molding, it is prone to bending and deformation after injection cooling, making it difficult to guarantee the flatness of the plastic body 310. Therefore, separating the plastic body 310 into two parts helps ensure good flatness after injection molding, reduces the likelihood of bending and deformation after injection cooling, achieves higher manufacturing precision, and ensures good fit with the battery cover 100.

[0068] Example 2

[0069] This embodiment also provides a battery, which differs from the battery in Embodiment 1 in that: in this embodiment, the first electrolyte injection hole 110 is disposed on the housing 200, and the plastic part 300 is disposed on the side of the housing 200 facing the receiving cavity, sandwiched between the housing 200 and the electrode assembly 400. The second electrolyte injection hole 3111 on the plastic part 300 communicates with the first electrolyte injection hole 110 on the housing 200. The structure of the plastic part 300 is the same as in Embodiment 1. By using the above-mentioned plastic part 300, its support portion 320 can ensure smooth electrolyte injection or vacuuming of the battery, avoiding the situation where the insulating tape blocks the second electrolyte injection hole 3111 and the third electrolyte injection hole 3211, which helps to quickly inject electrolyte and quickly vacuum, resulting in higher efficiency.

[0070] The remaining structures in this embodiment are the same as those in Embodiment 1, and will not be described in detail here.

[0071] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A battery, characterized by, include: Battery cover; The housing is connected to and encloses the battery cover to form a receiving cavity, and one of the battery cover and the housing is provided with a first liquid injection hole; A plastic part includes a plastic part body and a support portion. The plastic part body is disposed on the side of the battery cover or the housing near the receiving cavity. The support portion is disposed on the side of the plastic part body near the receiving cavity. The plastic part body is provided with a second injection hole that communicates with the first injection hole. The support portion includes a first boss and at least two second bosses. The first boss is connected to the plastic body circumferentially to the second injection hole, and the first boss is provided with a third injection hole communicating with the second injection hole. At least two second bosses are arranged circumferentially to the third injection hole and are spaced apart on the end face of the first boss away from the plastic body. A flow channel is formed between two adjacent second bosses, and the flow channel communicates with the third injection hole. Wherein, the sum of the areas of the end faces of all the second bosses on the side facing the accommodating cavity is S, and S is in the range of 5mm 2 ≤S≤50mm 2 .

2. The battery of claim 1, wherein, The first injection hole is provided on the battery cover plate. The end face of the battery cover plate near the plastic body is provided with an annular boss. The annular boss is located around the first injection hole. The end face of the plastic body facing the battery cover plate is provided with a groove, and the annular boss is accommodated in the groove.

3. The battery of claim 2, wherein, The annular boss is circular, and the wall of the sink includes an arc-shaped wall surface, which mates with the peripheral sidewall of the annular boss.

4. The battery of claim 2, wherein, The battery also includes an electrode assembly disposed within the accommodating cavity. A clamping part is provided on the side of the plastic body opposite to the battery cover plate, and the clamping part abuts against the electrode assembly. Along the first direction, the distance between the end face of the second boss facing the electrode group and the end face of the plastic body facing the electrode group is h1, and the distance between the end face of the pressing part facing the electrode group and the end face of the plastic body facing the electrode group is h2, where h1 < h2. The value range of h1 is: 0.8mm≤h1≤8mm; The value range of h2 is: 1.5mm≤h2≤16mm.

5. The battery of claim 4, wherein, The plastic body has an exhaust section on the side away from the battery cover, and the exhaust section has multiple air holes. The battery cover has a burst hole, and an explosion-proof valve is installed in the burst hole. The air hole connects the accommodating cavity with the pressure relief channel after the explosion-proof valve is opened. Along the first direction, the distance between the end face of the exhaust section facing the electrode group and the end face of the plastic body facing the electrode group is h3, where h1 < h3 ≤ h2; The value range of h3 is: 1.5mm≤h3≤16mm.

6. The battery of claim 4, wherein, The plastic part body is provided with a reinforcing rib on the side away from the battery cover plate, and the reinforcing rib is located in the circumferential direction of the support part; Along the first direction, the distance between the end face of the reinforcing rib facing the pole group and the end face of the plastic body facing the pole group is h4, h4 < h1; The value of h4 is in the range of 0.4mm ≤ h4 ≤ 5mm.

7. The battery of claim 4, wherein, Along the first direction, the height of the first boss is h11, the height of the second boss is h12, and h1 = h11 + h12; The value range of h11 is: 0.5mm≤h11≤5mm; The value range of h12 is: 0.3mm≤h12≤3mm.

8. The battery of any one of claims 1-7, wherein, The second protrusion is provided in two parts, and the two second protrusions are respectively located on opposite sides of the third injection hole along the second direction; Alternatively, the two second protrusions are respectively disposed on opposite sides of the third injection hole along a third direction.

9. The battery of any one of claims 1-7, wherein, The plastic body includes a first part and a second part, with the second injection hole and the support part disposed in the first part.

10. The battery of any one of claims 1-7, wherein, The battery also includes a sealing component that seals the first injection hole.

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