Plastic part and battery

Abstract

The utility model belongs to the technical field of batteries, and particularly discloses a plastic part and a battery, the plastic part comprises a plastic part body, a first boss and a supporting table which are connected in sequence, the plastic part body is arranged on one side, close to a pole group, of a cover plate body or a shell, the supporting table is arranged on the first boss, and the supporting table abuts against the pole group so as to tightly press the pole group in the shell. A first boss is arranged on the plastic part body, a first circulation channel is formed in the first boss and located in the circumferential direction of the supporting table, the interior of the first boss is hollow, a first circulation cavity is defined by the first boss and the plastic part body, and a liquid injection hole in the cover plate body or the shell, the first circulation cavity and the first circulation channel are sequentially communicated. The electrolyte can quickly flow into the shell, and the pole group can be immersed in the electrolyte, so that the liquid injection time and the pole group infiltration time are shortened. The utility model further provides a battery which comprises the plastic part.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a plastic part and battery. BACKGROUND

[0002] Lithium ion battery is widely used in traffic power supply, power storage power supply, new energy storage power supply, aerospace military industry and other fields at present because of its advantages such as large capacity, high working voltage, strong charge holding ability and long cycle life. Single lithium ion battery generally includes pole group, battery cover plate assembly, shell, internal and external insulation structure and the like, wherein the battery cover plate assembly and the shell are fixed by laser welding, and the both jointly constitute a closed cavity which protects the pole group and has certain structural strength, the space in the closed cavity is filled with electrolyte except the pole group, and the pole column, explosion-proof valve, liquid injection hole and the like are integrated on the battery cover plate assembly.

[0003] As shown in the following Figure 1 At present, the common battery cover plate 10' is formed by stamping to form a liquid injection hole 11', so as to facilitate injecting electrolyte into the closed cavity after the battery cover plate 10' and the shell are welded. In order to enable the electrolyte to be smoothly injected into the inside of the closed cavity, a flow-through channel 22' of electrolyte is generally reserved on the boss 21' of the lower plastic part 20', so that the pole group can be immersed in the electrolyte. However, in the actual assembly structure of the lithium ion battery, the pole group often needs to be compressed through the boss 21' to improve the stability of the pole group in the shell and avoid the pole group from shaking, so that the boss 21' and the pole group are compressed very tightly, and the electrolyte can only penetrate into the inside of the closed cavity little by little, resulting in that the liquid injection time and the pole group immersion time are lengthened, and the processing efficiency is reduced. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a plastic part and battery, which can enable the electrolyte to be quickly injected into the shell where the pole group is located under the condition that the pole group is stably fixed, shorten the liquid injection time and the pole group immersion time, and have high processing efficiency.

[0005] In order to achieve the purpose, the utility model adopts the following technical scheme:

[0006] On the one hand, the utility model provides a plastic part, which comprises:

[0007] A plastic part body;

[0008] A first boss connected to the end face of one side of the plastic part body, wherein a first flow-through channel is arranged on the first boss, the inside of the first boss is hollow, and the first boss and the plastic part body surround to form a first flow-through cavity;

[0009] A support table is connected to the end face of the first boss away from the body of the plastic part, the support table abuts against the pole group, and the first flow-through channel is located in the circumferential direction of the support table.

[0010] Optionally, in the Z-axis direction, the support table is in interference fit with the pole group, the compression amount of the pole group is A, the interference amount between the support table and the pole group is a, and the height of the support table is h1.

[0011] Wherein, h1=A+a; the value range of A is: 2mm≤A≤3mm.

[0012] The value range of a is: 1.5mm≤a≤2.5mm.

[0013] Optionally, the plastic part further comprises a second boss, the second boss and the first boss are respectively arranged at two ends of the body of the plastic part along the X-axis direction, and the second boss abuts against the pole group.

[0014] Wherein, in the Z-axis direction, the height of the first boss is h2, the height of the second boss is h3, and h3=h1+h2.

[0015] Optionally, the first boss comprises a plurality of first side walls and a first bottom wall, wherein one end of at least one of the first side walls is connected to the body of the plastic part, and the other end of the first side wall is connected to the first bottom wall.

[0016] The support table is connected to the first bottom wall, the first flow-through channel comprises a plurality of first perforations, the plurality of first perforations are arranged on the first bottom wall, and the plurality of first perforations are arranged in the circumferential direction of the support table at intervals.

[0017] And / or, the first flow-through channel further comprises a plurality of second perforations, and the plurality of second perforations are arranged on the first side wall close to the center point of the body of the plastic part.

[0018] Optionally, in the Z-axis direction, the total projection area of the plurality of first perforations on the body of the plastic part is S1, the projection area of the first boss on the body of the plastic part is S2, and the proportion of the total projection area S1 in the projection area S2 is k.

[0019] Wherein, k=S1 / S2, and the value range of k satisfies: 0.3≤k≤0.5.

[0020] Optionally, the first perforation is one of a circular hole, a polygonal hole or a waist-shaped hole.

[0021] And / or, the second perforation is one of a circular hole, a polygonal hole or a waist-shaped hole.

[0022] Optionally, the support table comprises a plurality of second side walls and a second bottom wall, one end of the second side wall is connected with the first boss, the other end of the second side wall is connected with the second bottom wall, the second bottom wall is in abutment with the pole group, and the second side wall is provided with a second flow passage.

[0023] Optionally, the second flow passage comprises a plurality of third perforations, the plurality of third perforations are arranged on the second side wall at intervals, and the third perforation is one of a circular hole, a polygonal hole or a waist-shaped hole.

[0024] In another aspect, the utility model provides a kind of battery, including cover plate body, shell, pole group and the plastic piece in any of above-mentioned scheme, the pole group is arranged in the shell, the cover plate body is connected in the shell, and the plastic piece is arranged in the cover plate body or the side of shell close to the pole group.

[0025] Optionally, the cover plate body is provided with a liquid injection hole, the plastic piece is arranged on the side of the cover plate body close to the pole group, and the projection of the first boss on the cover plate body can cover the projection of the liquid injection hole on the cover plate body along the Z-axis direction.

[0026] Or, the plastic piece is arranged on the side of the shell close to the pole group, and the shell is provided with a liquid injection hole, and the projection of the first boss on the shell can cover the projection of the liquid injection hole on the shell along the Z-axis direction.

[0027] The utility model has the advantages of:

[0028] The utility model provides a kind of plastic piece, including plastic piece body, first boss and support table connected in sequence, wherein plastic piece body is arranged on the side of cover plate body or shell close to pole group, support table is arranged on first boss, and support table can be in abutment with pole group, so that plastic piece can compress pole group in shell, avoid pole group to shake in shell, and pole group is fixed stably. First boss is provided with first flow passage, and first flow passage is located in the circumferential direction of support table. The inside of first boss is hollow, and first boss and plastic piece body surround first flow cavity. Liquid injection hole on cover plate body or shell, first flow cavity and first flow passage are sequentially communicated. When support table is in abutment with pole group, first flow passage is not blocked by pole group, so that electrolyte can flow into shell quickly in sequence through liquid injection hole, first flow cavity and first flow passage, and pole group can be immersed in electrolyte, liquid injection time and pole group soaking time are shortened, and processing efficiency is greatly improved.

[0029] The utility model also provides a battery, including cover plate body, shell, pole group and above -mentioned plastic part, pole group sets up in the shell, cover plate body is connected in the shell, plastic part sets up in the cover plate body or the shell near pole group's one side. Cover plate body or the shell is equipped with the liquid injection hole, and the first boss is opposite to the liquid injection hole. After the battery cover plate and the shell assembly, the support station on the first boss can be close to pole group, guarantees pole group in the shell not to shake, simultaneously support station can not shield the first flow channel on the first boss, to ensure that electrolyte flows smoothly, shortens the liquid injection time and pole group infiltration time. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the following will be to the utility model embodiment description needed to use the drawing briefly introduced, obviously, the following description in the drawing only some embodiments of the utility model, for the ordinary skilled person in the art comes, under the premise of not paying the creative labor, can also obtain other drawings according to the content of the utility model embodiment and these drawings.

[0031] Figure 1 It is the structural diagram of the battery cover plate and the lower plastic part in the prior art;

[0032] Figure 2 It is the structural diagram of the cover plate body and the plastic part provided in the embodiment one of the utility model;

[0033] Figure 3 It is the sectional structure schematic diagram of the plastic part provided in the embodiment one of the utility model.

[0034] In the drawing:

[0035] 10', battery cover plate;11', liquid injection hole;20', lower plastic part;21', boss;22', flow channel;

[0036] 100, plastic part;110, plastic body;111, fourth perforation;112, through hole;120, first boss;1201, first flow cavity;121, first bottom wall;1211, first perforation;122, first side wall;1221, second perforation;130, support station;1301, second flow cavity;131, second side wall;132, second bottom wall;140, second boss;200, cover plate body;210, liquid injection hole;220, explosion-proof valve;230, pole. DETAILED DESCRIPTION

[0037] The utility model will be further described in detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model, and not to limit the utility model. In addition, it should be noted that, in order to facilitate the description, only the part related to the utility model is shown in the drawings, not all structures.

[0038] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0039] In the utility model, unless otherwise explicitly specified and limited, the first feature is "on" or "below" the second feature, which can include direct contact between the first and second features, or indirect contact between the first and second features through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0040] In the description of the embodiment, the terms "up", "down", "left", "right" and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation of the utility model. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0041] Embodiment one

[0042] As Figure 2 And Figure 3As shown, the embodiment provides a plastic part 100 arranged on one side of a cover plate body 200, the cover plate body 200 is provided with a liquid injection hole 210, the cover plate body 200 is arranged on one side of a shell and is welded to the shell, and the shell is provided with a pole group. The plastic part 100 comprises a plastic part body 110, a first boss 120 and a support table 130 connected in sequence, wherein the plastic part body 110 is arranged on the side of the cover plate body 200 close to the pole group, the first boss 120 is arranged on the end face of the side of the plastic part body 110 away from the cover plate body 200, and the support table 130 is connected to the end face of the first boss 120 away from the plastic part body 110. Along the Z-axis direction shown in Figure 2 and Figure 3 The projection of the first boss 120 on the cover plate body 200 can cover the projection of the liquid injection hole 210 on the cover plate body 200, and the projection of the first boss 120 on the cover plate body 200 can cover the projection of the support table 130 on the cover plate body 200. Since the support table 130 is arranged on the side close to the pole group, the abutment of the support table 130 and the pole group enables the plastic part 100 to press the pole group in the shell, thereby avoiding the pole group from shaking in the shell. The Z-axis direction is the height direction of the pole group.

[0043] Further, the first boss 120 is provided with a first flow channel, and the first flow channel is located in the circumferential direction of the support table 130. The first boss 120 is hollow, and a first flow cavity 1201 is formed between the first boss 120 and the plastic part body 110, and the liquid injection hole 210, the first flow cavity 1201 and the first flow channel are communicated in sequence. Since the first flow channel is located in the circumferential direction of the support table 130, when the support table 130 abuts against the pole group, the first flow channel will not be blocked by the pole group, so that the electrolyte injected through the liquid injection hole 210 on the cover plate body 200 can flow into the shell through the liquid injection hole 210, the first flow cavity 1201 and the first flow channel in sequence, and the pole group can be immersed in the electrolyte, thereby shortening the liquid injection time and the pole group immersion time, and greatly improving the processing efficiency.

[0044] Generally, the outside of the pole group is wrapped with a flexible insulation layer, so the pole group has a certain deformation ability. Continuing to refer to Figure 3, along the Z-axis direction, when the support table 130 abuts against the pole group, the support table 130 and the pole group are in interference fit, the compression amount of the pole group is A (A is the maximum compression amount of the pole group), the interference amount between the support table 130 and the pole group is a, and the height of the support table 130 is h1; wherein h1=A+a; the value range of A is: 2mm≤A≤3mm; and the value range of a is: 1.5mm≤a≤2.5mm. Exemplarily, the value of A can be 2.0mm, 2.5mm or 3.0mm, etc. The value of a can be 1.5mm, 2.0mm, or 2.5mm, etc. By adopting the above settings, it is ensured that the support table 130 abuts against the pole group, and after the pole group is compressed and deformed, there is still a certain gap between the end face of the first boss 120 close to the side of the plastic part 100 and the pole group, thereby ensuring that the first flow-through channel provided on the first boss 120 is not blocked by the pole group, and thus the electrolyte can smoothly flow through the first flow-through channel, and the flow is relatively smooth, and the flow rate of the electrolyte is relatively high.

[0045] Further, the plastic part 100 further comprises a second boss 140, along the X-axis direction shown in Figure 2 and Figure 3 , the second boss 140 and the first boss 120 are respectively arranged at both ends of the plastic part body 110. Along the Z-axis direction shown in Figure 2 and Figure 3 , the second boss 140 can also abut against the pole group and compress the pole group in the shell. Wherein, along the Z-axis direction shown in Figure 2 and Figure 3 , the height of the first boss 120 is h2, and the height of the second boss 140 is h3, h3=h1+h2. That is, along the Z-axis direction shown in Figure 2 and Figure 3 , the sum of the heights of the first boss 120 and the support table 130 is equal to the height of the second boss 140, thereby making the pressure on both ends of the pole group in the length direction (the length direction of the pole group is the X-axis direction shown in Figure 2 and Figure 3 ) of the plastic part 100 equal, and the stress of the pole group is more balanced.

[0046] Continuing to refer to Figure 2 and Figure 3In this embodiment, the first boss 120 is square-shaped and includes four first sidewalls 122 and one first bottom wall 121. At least one end of the first sidewall 122 is connected to the plastic body 110, and the other ends of the multiple first sidewalls 122 are all connected to the first bottom wall 121. The support platform 130 is connected to the first bottom wall 121. The first flow channel includes multiple first perforations 1211. The multiple first perforations 1211 are disposed on the first bottom wall 121 and are spaced apart around the support platform 130. Thus, the support platform 130 does not obstruct the first perforations 1211. Electrolyte can flow into the shell through the injection hole 210, the first flow cavity 1201, and the first perforations 1211.

[0047] The first flow channel also includes a plurality of second perforations 1221, which are spaced apart on the first sidewall 122 near the center point of the plastic body 110, i.e., on the first sidewall 122 connected to the plastic body 110. Optionally, the first sidewall 122 can be inclined to accelerate the flow of electrolyte. In this case, the electrolyte can flow into the housing sequentially through the injection hole 210, the first flow cavity 1201, and the second perforations 1221.

[0048] Optionally, the first through hole 1211 is one of a circular hole, a polygonal hole, or an oblong hole. The second through hole 1221 is one of a circular hole, a polygonal hole, or an oblong hole. Exemplarily, in this embodiment, the first through hole 1211 is a circular hole, and the second through hole 1221 is an oblong hole, with the length of the oblong hole extending along the Z-axis. The diameter of the circular hole is 1mm-2mm. The width of the oblong hole is 1mm-2mm, and the length of the oblong hole is 3-5mm.

[0049] Furthermore, along Figure 2 and Figure 3 In the Z-axis direction shown, the total projected area of ​​the multiple first perforations 1211 on the plastic body 110 is S1, and the projected area of ​​the first boss 120 on the plastic body 110 is S2. The proportion of the total projected area S1 to the projected area S2 is k. Wherein, k = S1 / S2, and the value of k satisfies: 0.3 ≤ k ≤ 0.5. For example, the value of k can be 0.3, 0.4, or 0.5. By controlling the value of k within the above range, the flow area of ​​the first flow channel is made large enough to meet the flow requirements of the electrolyte, resulting in a faster electrolyte flow rate and helping to shorten the injection time.

[0050] Furthermore, the support platform 130 is also a square shell shape, including multiple second sidewalls 131 and a second bottom wall 132. One end of each of the multiple second sidewalls 131 is connected to the first bottom wall 121 of the first protrusion 120, and the other end of each of the multiple second sidewalls 131 is connected to the second bottom wall 132. The second bottom wall 132 abuts against the electrode assembly. A second flow channel is provided on the second sidewalls 131. The multiple second sidewalls 131 and the second bottom wall 132 surround and form a second flow cavity 1301. The injection hole 210, the first flow cavity 1201, the second flow cavity 1301, and the second flow channel are sequentially connected. Thus, the electrolyte can flow into the shell through the injection hole 210, the first flow cavity 1201, the second flow cavity 1301, and the second flow channel, preventing the electrolyte from accumulating in the second flow cavity 1301. More preferably, the second flow channel is located at the connection between the second sidewall 131 and the second bottom wall 132, so that all the electrolyte can flow into the shell.

[0051] Optionally, the second flow channel includes a plurality of third perforations (not shown in the figure), which are spaced apart on the second sidewall 131. The third perforations are one of a circular hole, a polygonal hole, or an oblong hole. For example, in this embodiment, the third perforation can be a circular hole with a diameter of 1mm-2mm.

[0052] This embodiment also provides a battery, including a cover plate body 200, a housing, an electrode assembly, and the aforementioned plastic part 100. An opening is provided on one side of the housing, through which the electrode assembly is inserted into the housing. The cover plate body 200 is welded to the opening of the housing, and the plastic part 100 is disposed on the side of the cover plate body 200 near the electrode assembly. Figure 2 In the X-axis direction shown, the first boss 120 of the plastic part 100 and the injection hole 210 on the cover plate body 200 are located at the same end in the length direction (X-axis direction) of the electrode assembly. Figure 2 As shown in the Z-axis direction (the height direction of the electrode assembly), the projection of the first boss 120 on the cover plate body 200 can cover the projection of the injection hole 210 on the cover plate body 200, so that the injection hole 210 can communicate with the first flow cavity 1201 formed by the first boss 120 and the plastic part body 110, facilitating electrolyte injection. By using the aforementioned plastic part 100, after the cover plate body 200 is assembled with the housing, the support platform 130 on the first boss 120 can press against the electrode assembly, ensuring that the electrode assembly does not shake inside the housing, and at the same time, it will not block the first flow channel on the first boss 120, thereby ensuring smooth electrolyte flow and shortening the injection time and electrode assembly wetting time.

[0053] Furthermore, the cover plate body 200 is also equipped with an explosion-proof valve 220, and the plastic body 110 is equipped with multiple fourth through holes 111, along... Figure 2In the Z-axis direction shown in the figure, the projection of the explosion-proof valve 220 on the cover plate body 200 can cover the projection of the fourth perforation 111 on the cover plate body 200, so that when the pressure in the shell exceeds the opening pressure of the explosion-proof valve 220, the high-pressure gas will contact the explosion-proof valve 220 through the fourth perforation 111 and break the explosion-proof valve 220, and the pressure in the shell is quickly released, which is safe.

[0054] The cover plate body 200 also integrates a pole column 230, the pole column 230 is provided in a through hole 112 in the cover plate body 200, one end of the pole column 230 is connected with the tab of the pole group, and the other end of the pole column 230 is connected with an external circuit, so that the pole group can supply power or charge the external circuit. For example, the cover plate body 200 in the embodiment adopts a double-pole column design scheme, two pole columns 230 are provided on the cover plate body 200, and the two pole columns 230 are of the same polarity, so that the battery has a large current capacity and meets the use requirements in a large current scene. The two pole columns 230 on the cover plate body 200 can be both positive pole columns or both negative pole columns.

[0055] Alternatively, in some embodiments, the cover plate body 200 can also adopt a single-pole column design scheme, and the pole column 230 on the cover plate body 200 can be a positive pole column or a negative pole column, which will not be described here.

[0056] Embodiment Two

[0057] The plastic part 100 in the embodiment has the same structure as the plastic part 100 in Embodiment One, and the difference lies in that the installation position of the plastic part 100 in the embodiment is different.

[0058] Specifically, the plastic part 100 in the embodiment is arranged on the side of the shell close to the pole group. The shell is provided with a liquid injection hole 210, the first boss 120 of the plastic part 100 is opposite to the liquid injection hole 210 on the shell, that is, along the height direction (Z-axis direction) of the pole group, the projection of the first boss 120 on the shell can cover the projection of the liquid injection hole 210 on the shell, and the pole group can be tightly abutted in the shell by the supporting table 130. The first boss 120 is provided with a first flow-through channel, the first flow-through channel is located in the circumferential direction of the supporting table 130, the first boss 120 is hollow, the first boss 120 and the plastic part body 110 surround a first flow-through cavity 1201, and the liquid injection hole 210 on the shell, the first flow-through cavity 1201 and the first flow-through channel are sequentially communicated. When the supporting table 130 abuts against the pole group, the first flow-through channel will not be blocked by the pole group, so that the electrolyte can flow into the shell through the liquid injection hole 210, the first flow-through cavity 1201 and the first flow-through channel in sequence, and the pole group can be immersed in the electrolyte, thereby shortening the liquid injection time and the pole group soaking time, and greatly improving the processing efficiency.

[0059] The battery also comprises a shell, a pole group and the plastic part 100, one side of the shell is provided with an opening, the pole group is arranged in the shell through the opening, the cover plate body 200 is welded with the opening of the shell, and the plastic part 100 is arranged on the side of the shell close to the pole group. The first boss 120 of the plastic part 100 and the liquid injection hole 210 on the shell are arranged at the same end in the length direction (X-axis direction) of the pole group. In the height direction of the pole group, the projection of the first boss 120 on the shell can cover the projection of the liquid injection hole 210 on the shell, so that the liquid injection hole 210 can be communicated with the first flow cavity 1201 surrounded by the first boss 120 and the plastic part body 110, and the liquid injection is facilitated. By adopting the above plastic part 100, after the cover plate body 200 and the shell are assembled, the supporting table 130 on the first boss 120 can abut against the pole group, the pole group is prevented from shaking in the shell, and the first flow channel on the first boss 120 is not blocked, so that the electrolyte can flow smoothly, the liquid injection time and the pole group soaking time are shortened.

[0060] The rest of the structure in the embodiment is the same as that in the first embodiment, and will not be repeated here.

[0061] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not the limitation of the embodiments of the utility model. For ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be carried out without departing from the protection scope of the utility model. Here, all the embodiments need not and cannot be exhausted. Any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A plastic part, characterized in that, The plastic part comprises: a plastic part body; a first boss connected to an end surface of one side of the plastic part body, the first boss being provided with a first flow passage, the first boss being hollow inside, the first boss and the plastic part body surrounding to form a first flow cavity; a support table connected to an end surface of the first boss away from the plastic part body, the support table abutting against the pole group, the first flow passage being located in the circumferential direction of the support table.

2. The plastic part of claim 1, wherein, In the Z-axis direction, the support table and the pole group are in interference fit, the compression amount of the pole group is A, the interference amount between the support table and the pole group is a, and the height of the support table is h1; wherein h1=A+a; the value range of A is: 2mm≤A≤3mm; the value range of a is: 1.5mm≤a≤2.5mm.

3. The plastic part of claim 2, wherein, The plastic part further comprises a second boss, the second boss and the first boss are respectively arranged at both ends of the plastic part body along the X-axis direction, and the second boss abuts against the pole group; wherein, in the Z-axis direction, the height of the first boss is h2, and the height of the second boss is h3, h3=h1+h2.

4. The plastic part of claim 1, wherein, The first boss comprises a plurality of first side walls and a first bottom wall, wherein one end of at least one of the first side walls is connected to the plastic part body, and the other end of the first side wall is connected to the first bottom wall; the support table is connected to the first bottom wall, the first flow passage comprises a plurality of first perforations, a plurality of the first perforations are arranged on the first bottom wall, and a plurality of the first perforations are arranged in the circumferential direction of the support table; and / or, the first flow passage further comprises a plurality of second perforations, a plurality of the second perforations are arranged on the first side wall close to the center point of the plastic part body.

5. The plastic part of claim 4, wherein, In the Z-axis direction, the total projection area of a plurality of the first perforations on the plastic part body is S1, the projection area of the first boss on the plastic part body is S2, and the proportion of the total projection area S1 in the projection area S2 is k; wherein, k=S1 / S2, the value range of k satisfies: 0.3≤k≤0.

5.

6. The plastic part of claim 4, wherein, The first perforation is one of a circular hole, a polygonal hole or a waist-shaped hole; and / or, the second perforation is one of a circular hole, a polygonal hole or a waist-shaped hole.

7. The plastic part according to any one of claims 1-6, wherein, The support table comprises a plurality of second side walls and a second bottom wall, one end of the second side wall is connected to the first boss, the other end of the second side wall is connected to the second bottom wall, the second bottom wall abuts against the pole group, the second side wall is provided with a second flow passage, and a plurality of the second side walls and the second bottom wall surround to form a second flow cavity.

8. The plastic part of claim 7, wherein, The second flow passage comprises a plurality of third perforations, a plurality of the third perforations are arranged on the second side wall, and the third perforation is one of a circular hole, a polygonal hole or a waist-shaped hole.

9. A battery, characterized by The plastic part comprises a cover plate body, a shell, a pole group, and the plastic part of any one of claims 1-8, the pole group is arranged in the shell, the cover plate body is connected to the shell, and the plastic part is arranged on one side of the cover plate body or the shell close to the pole group.

10. The battery of claim 9, wherein, The cover plate body is provided with a liquid injection hole, the plastic part is arranged on one side of the cover plate body close to the pole group, and the projection of the first boss on the cover plate body can cover the projection of the liquid injection hole on the cover plate body along the Z-axis direction. Or, the plastic part is arranged on one side of the shell close to the pole group, the shell is provided with a liquid injection hole, and the projection of the first boss on the shell can cover the projection of the liquid injection hole on the shell along the Z-axis direction.

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