Lower plastic structure for power battery and battery

Abstract

The utility model discloses a lower plastic structure for a power battery and a battery, which belong to the technical field of batteries, and comprise a plastic body with a first side surface and a second side surface, and a first pole hole, a second pole hole, an explosion-proof valve through hole and a liquid injection hole which are respectively arranged on the plastic body and are positioned on the first side surface, the flow guide mechanism is arranged on the plastic body and located on the second side face, the explosion-proof valve through hole is located between the first pole column hole and the second pole column hole, and the liquid injection hole is located between the explosion-proof valve through hole and the first pole column hole; the flow guide mechanism comprises a supporting frame connected with the plastic body and a baffle connected with the supporting frame, and a plurality of flow guide holes communicated with the liquid injection hole are defined by the baffle, the supporting frame and the plastic body. According to the utility model, the technical effects of avoiding the short circuit in the battery cell caused by the impact of electrolyte on the battery cell pole piece and improving the battery liquid injection efficiency and the output rate of production equipment are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and particularly relates to a lower plastic structure for a power battery and a battery. Background Art

[0002] As an essential component of new energy devices, battery products are widely used in fields such as electric vehicles, household energy storage, portable batteries, and digital batteries. Lower plastic parts are widely used in the setting of the power battery top cover. Usually, the lower plastic parts are arranged between the battery cell and the top cover to prevent the battery cell from moving upward and play an insulating role.

[0003] Currently, in battery technology, during the production process of the battery, electrolyte needs to be injected through a liquid injection hole. After a through hole corresponding to the liquid injection hole of the top cover is arranged on the lower plastic body, a liquid injection channel for the electrolyte is formed. The liquid injection device pressurizes and injects the electrolyte directly into the battery through the liquid injection channel. Under the requirement of pursuing production efficiency, each production process needs to pursue the ultimate production rhythm. If the liquid injection production efficiency of the power battery is to be improved, the liquid injection pressure needs to be increased when injecting the electrolyte. However, the increase in the liquid injection pressure causes the high-pressure liquid to impact the electrode plates of the battery cell, easily damaging the electrode plates and resulting in an internal short circuit of the battery cell. At the same time, it is not conducive to improving the battery liquid injection efficiency and the output rate of production equipment.

[0004] Therefore, it is necessary to provide a new technical solution to solve the above technical problems. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is the technical problem that the electrolyte easily impacts the electrode plates of the battery cell, resulting in an internal short circuit of the battery cell and making it difficult to improve the battery liquid injection efficiency and the output rate of production equipment.

[0006] To solve the above technical problem, the utility model provides a lower plastic structure for a power battery. The lower plastic structure includes: a plastic body having a first side surface and a second side surface, a first pole hole, a second pole hole, an explosion-proof valve through hole, and a liquid injection hole respectively arranged on the plastic body and located on the first side surface, and a diversion mechanism arranged on the plastic body and located on the second side surface. The explosion-proof valve through hole is located between the first pole hole and the second pole hole, and the liquid injection hole is located between the explosion-proof valve through hole and the first pole hole; the diversion mechanism includes a support frame connected to the plastic body and a baffle plate connected to the support frame. The baffle plate, the support frame, and the plastic body enclose a plurality of diversion holes communicated with the liquid injection hole.

[0007] Optionally, the plurality of diversion holes include a first diversion hole, a second diversion hole, a third diversion hole, and a fourth diversion hole. The first diversion hole and the third diversion hole are distributed oppositely, and the second diversion hole and the fourth diversion hole are distributed oppositely.

[0008] Optionally, the support frame includes: a first support column, a second support column, a third support column, and a fourth support column. The first support column is respectively connected to the plastic body and the baffle; the second support column is respectively connected to the plastic body and the baffle; the third support column is respectively connected to the plastic body and the baffle; the fourth support column is respectively connected to the plastic body and the baffle. Wherein the first diversion hole is located between the first support column and the second support column, the second diversion hole is located between the second support column and the third support column, the third diversion hole is located between the third support column and the fourth support column, and the fourth diversion hole is located between the fourth support column and the first support column.

[0009] Optionally, the first support column, the second support column, the third support column, and the fourth support column are respectively perpendicular to the baffle.

[0010] Optionally, the baffle is circular, and the first support column, the second support column, the third support column, and the fourth support column are symmetrically distributed around the center of the baffle.

[0011] Optionally, the projection of the support frame on the baffle along the direction in which the plastic body approaches the baffle is located on the baffle, and the support frame and the baffle are integrally formed.

[0012] Optionally, the liquid injection hole is directly opposite to the center of the baffle.

[0013] Optionally, the numerical range of the distance between the baffle and the second side surface is 4.0 mm to 5 mm.

[0014] Optionally, the baffle is made of rubber material.

[0015] According to another aspect of the present invention, the present invention further provides a battery, and the battery includes the lower plastic structure for a power battery described above.

[0016] Beneficial effects:

[0017] The present utility model provides a lower plastic structure for a power battery. By respectively arranging a first pole hole, a second pole hole, an explosion-proof valve through-hole and a liquid injection hole on a plastic body, the first pole hole, the second pole hole, the explosion-proof valve through-hole and the liquid injection hole are all located on the first side surface of the plastic body. The explosion-proof valve through-hole is located between the first pole hole and the second pole hole, and the liquid injection hole is located between the explosion-proof valve through-hole and the first pole hole. A diversion mechanism is arranged on the plastic body, and the diversion mechanism is located on the second side surface. In the diversion mechanism, a support frame is connected to the plastic body, and a baffle is connected to the support frame. The baffle, the support frame and the plastic body enclose to form a plurality of diversion holes, and the plurality of diversion holes are respectively communicated with the liquid injection hole. In this way, after the electrolyte is pressurized by a liquid injection device and injected through the liquid injection through-hole, when the electrolyte enters the diversion mechanism, the flow direction of the electrolyte in the diversion mechanism is changed, and the electrolyte is injected into the interior of the battery in a dispersed form through the plurality of diversion holes, which can effectively disperse the pressure of the electrolyte, avoid the direct impact of high-pressure liquid on the cell pole piece, and reduce the risk of internal short circuit of the cell. At the same time, the dispersed injection method can also improve the distribution uniformity of the electrolyte, which is beneficial to improving the liquid injection efficiency and the output rate of the production equipment. Thus, the technical effect of avoiding the internal short circuit of the cell caused by the impact of the electrolyte on the cell pole piece and improving the liquid injection efficiency of the battery and the output rate of the production equipment is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the following-described drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 FIG. is a schematic structural diagram of a lower plastic structure for a power battery provided by an embodiment of the present utility model.

[0020] Figure 2 FIG. is a schematic structural diagram of a liquid injection hole in a lower plastic structure for a power battery provided by an embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The following details the embodiments of the present application. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below with reference to the drawings are exemplary only for explaining the present application and should not be construed as limiting the present application.

[0022] To enable those skilled in the art to better understand the solution of this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope protected by this application.

[0023] In the embodiments of this application, "at least one" means one or more; "a plurality" means two or more. In the description of this application, terms such as "first", "second", "third", etc. are only used for the purpose of distinguishing descriptions, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying order.

[0024] The reference to "an embodiment" or "some embodiments" etc. described in this specification means that a specific feature, structure or characteristic described in connection with the embodiment is included in one or more embodiments of this application. Thus, the terms "including", "comprising", "having" and their variants in this specification all mean "including but not limited to", unless otherwise specifically emphasized in other ways. It should be noted that in the embodiments of this application, "and / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone, these three situations.

[0025] It should be pointed out that in the embodiments of the present utility model, when a component is referred to as "fixed to" another component, it can be directly on the other component or there can also be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component at the same time. When a component is considered to be "disposed on" another component, it can be directly disposed on the other component or there may be an intermediate component at the same time. At the same time, "connection" in the embodiments of this application can also be understood as electrical connection, and the connection of two electrical components can be a direct or indirect connection between the two electrical components. For example, when A is connected to B, it can be either a direct connection between A and B or an indirect connection between A and B through one or more other electrical components. The terms "vertical", "horizontal", "left", "right" and similar expressions used in the embodiments of the present utility model are only for illustrative purposes and are not intended to limit the present utility model.

[0026] An under-plastic structure for a power battery provided in Embodiment 1 of the present utility model, please refer to Figures 1 to 2 as shown in Figure 1 is a schematic structural diagram of an under-plastic structure for a power battery provided in the embodiments of the present utility model, Figure 2It is a schematic structural diagram of a liquid injection hole 23 in a lower plastic structure for a power battery provided by an embodiment of the present utility model. A lower plastic structure for a power battery provided by an embodiment of the present utility model includes a plastic body 1, a first pole hole 2, a second pole hole 21, an explosion-proof valve through-hole 22, a liquid injection hole 23 and a flow guiding mechanism 3. The plastic body 1 has a first side 11 and a second side 12. The first pole hole 2, the second pole hole 21, the explosion-proof valve through-hole 22 and the liquid injection hole 23 are respectively arranged on the plastic body 1, and the first pole hole 2, the second pole hole 21, the explosion-proof valve through-hole 22 and the liquid injection hole 23 are all located on the first side 11. The explosion-proof valve through-hole 22 is located between the first pole hole 2 and the second pole hole 21, and the liquid injection hole 23 is located between the explosion-proof valve through-hole 22 and the first pole hole 2. The flow guiding mechanism 3 is arranged on the plastic body 1, and the flow guiding mechanism 3 is located on the second side 12. The flow guiding mechanism 3 includes a support frame 31 and a baffle 32. The support frame 31 is connected to the plastic body 1, and the baffle 32 is connected to the support frame 31. The baffle 32, the support frame 31 and the plastic body 1 enclose to form a plurality of flow guiding holes, and the plurality of flow guiding holes are communicated with the liquid injection hole 23.

[0027] Among them, the first side 11 and the second side 12 are two opposite faces in the plastic body 1. The liquid injection hole 23 is used for injecting electrolyte. After the electrolyte passes through the liquid injection hole 23, it will flow through the support frame 31 and the baffle 32 of the flow guiding mechanism 3. The first pole hole 2 and the second pole hole 21 are respectively used for installing positive and negative pole columns. When the internal pressure of the battery rises abnormally, the explosion-proof valve can respond in time and release the pressure through the explosion-proof valve through-hole 22, effectively preventing safety accidents such as battery explosion.

[0028] In this embodiment, by respectively arranging the first pole hole 2, the second pole hole 21, the explosion-proof valve through hole 22 and the liquid injection hole 23 on the plastic body 1, the first pole hole 2, the second pole hole 21, the explosion-proof valve through hole 22 and the liquid injection hole 23 are all located on the first side surface 11 of the plastic body 1. The explosion-proof valve through hole 22 is located between the first pole hole 2 and the second pole hole 21, and the liquid injection hole 23 is located between the explosion-proof valve through hole 22 and the first pole hole 2. The diversion mechanism 3 is arranged on the plastic body 1 and is located on the second side surface 12. In the diversion mechanism 3, the support frame 31 is connected to the plastic body 1, and the baffle 32 is connected to the support frame 31. The baffle 32, the support frame 31 and the plastic body 1 enclose to form a plurality of diversion holes, and the plurality of diversion holes are respectively communicated with the liquid injection hole 23. After the electrolyte is pressurized by the liquid injection device and injected through the liquid injection through hole, when the electrolyte enters the diversion mechanism 3, the flow direction of the electrolyte in the diversion mechanism 3 is changed, and the electrolyte is injected into the interior of the battery in a dispersed form through the plurality of diversion holes, which can effectively disperse the pressure of the electrolyte, avoid the direct impact of the high-pressure liquid on the electrode sheet of the battery core, and reduce the risk of internal short circuit of the battery core. At the same time, the dispersed injection method can also improve the distribution uniformity of the electrolyte, which is beneficial to improving the liquid injection efficiency and the output rate of the production equipment. Thus, the technical effect of avoiding the internal short circuit of the battery core caused by the impact of the electrolyte on the electrode sheet of the battery core and improving the liquid injection efficiency of the battery and the output rate of the production equipment is achieved.

[0029] As an implementation manner, the plurality of diversion holes include a first diversion hole 33, a second diversion hole 34, a third diversion hole and a fourth diversion hole. The first diversion hole 33 and the third diversion hole are oppositely distributed, and the second diversion hole 34 and the fourth diversion hole are oppositely distributed, that is, the first diversion hole 33 is opposite to the third diversion hole, and the second diversion hole 34 is opposite to the fourth diversion hole. After the electrolyte is pressurized and injected by the liquid injection device, due to the opposite distribution of the first diversion hole 33 and the third diversion hole, and the opposite distribution of the second diversion hole 34 and the fourth diversion hole, the flow direction of the electrolyte in the diversion mechanism 3 is changed more effectively, and the electrolyte is dispersed into the first diversion hole 33, the second diversion hole 34, the third diversion hole and the fourth diversion hole in a more uniform manner. After the electrolyte flows out dispersedly from the first diversion hole 33, the second diversion hole 34, the third diversion hole and the fourth diversion hole respectively, it can not only avoid the direct impact of the high-pressure liquid on the electrode sheet of the battery core, but also significantly improve the distribution uniformity of the electrolyte, which is beneficial to reducing the risk of internal short circuit of the battery core.

[0030] In some embodiments, the support frame 31 includes a first support column 311, a second support column 312, a third support column, and a fourth support column. The first support column 311 is respectively connected to the plastic body 1 and the baffle 32. The second support column 312 is respectively connected to the plastic body 1 and the baffle 32. The third support column is respectively connected to the plastic body 1 and the baffle 32. The fourth support column is respectively connected to the plastic body 1 and the baffle 32. Wherein the first diversion hole 33 is located between the first support column 311 and the second support column 312. The second diversion hole 34 is located between the second support column 312 and the third support column. The third diversion hole is located between the third support column and the fourth support column. The fourth diversion hole is located between the fourth support column and the first support column 311. The support frame 31 is composed of four support columns, namely the first support column 311, the second support column 312, the third support column, and the fourth support column. The entire diversion mechanism 3 is supported by the first support column 311, the second support column 312, the third support column, and the fourth support column together. By positioning the first diversion hole 33, the second diversion hole 34, the third diversion hole, and the fourth diversion hole respectively between the corresponding two support columns, the electrolyte can flow along a predetermined path when passing through the diversion mechanism 3 and be evenly distributed into the first diversion hole 33, the second diversion hole 34, the third diversion hole, and the fourth diversion hole, which is beneficial to enhancing the stability and reliability of the diversion mechanism 3 and improving the dispersion effect of the electrolyte at the same time.

[0031] In some embodiments, the first support column 311, the second support column 312, the third support column, and the fourth support column are respectively perpendicular to the baffle 32, so that the support columns can more firmly support the baffle 32 and ensure that the baffle 32 will not shift or deform during the flow of the electrolyte. That is, when the electrolyte passes through the diversion mechanism 3, the first support column 311, the second support column 312, the third support column, and the fourth support column that are respectively perpendicular can ensure that the baffle 32 maintains its original position and shape, which is beneficial to avoiding situations such as the change of the electrolyte flow direction or uneven distribution caused by the deformation of the baffle 32 due to the impact of the electrolyte.

[0032] In some embodiments, the baffle 32 is circular, and the first support column 311, the second support column 312, the third support column, and the fourth support column are symmetrically distributed with respect to the center of the baffle 32, which is beneficial to improving the overall stability and uniformity of the diversion mechanism 3. That is, the circular baffle 32 enables the electrolyte to be evenly dispersed along the circumferential edge of the baffle 32 when contacting the baffle 32, which is beneficial to improving the uniformity of the electrolyte distribution. At the same time, the arrangement that the first support column 311, the second support column 312, the third support column, and the fourth support column are symmetrically distributed with respect to the center of the baffle 32 ensures that the first diversion hole 33, the second diversion hole 34, the third diversion hole, and the fourth diversion hole can all obtain an equal amount of electrolyte, which is beneficial to avoiding the situation of uneven electrolyte distribution.

[0033] In some embodiments, the support frame 31 is located on the baffle 32 in the direction where the plastic body 1 approaches the baffle 32, and the projection of the support frame 31 on the baffle 32 is located on the baffle 32. The support frame 31 and the baffle 32 can be integrally formed. The projection of the support frame 31 on the baffle 32 in the direction where the plastic body 1 approaches the baffle 32 is completely located within the baffle 32, so that at least a part of the baffle 32 is located outside the first diversion hole 33, the second diversion hole 34, the third diversion hole and the fourth diversion hole. When the electrolyte enters the diversion mechanism 3 through the liquid injection hole 23, the baffle 32 can effectively resist the impact force generated by the flow of the electrolyte, ensuring the stable operation of the first diversion hole 33, the second diversion hole 34, the third diversion hole and the fourth diversion hole. At the same time, the electrolyte flowing out from the first diversion hole 33, the second diversion hole 34, the third diversion hole and the fourth diversion hole respectively will be guided by the baffle 32, and the pressure of the electrolyte will be further guided and dispersed, so as to avoid the direct impact of high-pressure liquid on the electrode sheets of the battery cell.

[0034] In some embodiments, the liquid injection hole 23 is directly opposite to the center of the baffle 32, that is, in the direction perpendicular to the baffle 32, the liquid injection hole 23 is directly opposite to the center of the baffle 32. By aligning the liquid injection hole 23 with the center of the baffle 32, the electrolyte can be more quickly and evenly dispersed into the first diversion hole 33, the second diversion hole 34, the third diversion hole and the fourth diversion hole during the injection process, which is beneficial to reducing the flow path and resistance of the electrolyte in the diversion mechanism 3 and improving the liquid injection efficiency. At the same time, the electrolyte injected from the liquid injection hole 23 directly opposite to the center of the baffle 32 can evenly cover all areas of the electrode sheets of the battery cell, reducing the risk of internal short circuit in the battery cell.

[0035] In some embodiments, the numerical range of the distance between the baffle 32 and the second side surface 12 is 4.0 mm to 5 mm. Assuming the distance between the baffle 32 and the second side surface 12 is H, then 4.0 mm ≤ H ≤ 5 mm, so that the flow of the electrolyte inside the diversion mechanism 3 is neither too restricted nor too dispersed, ensuring that the electrolyte can smoothly and evenly pass through the diversion holes and be injected into the battery, and also avoiding the leakage or waste of the electrolyte caused by the too large distance between the baffle 32 and the second side surface 12, which is beneficial to improving the distribution uniformity of the electrolyte and the liquid injection efficiency.

[0036] In some embodiments, the baffle 32 is made of rubber material. The baffle 32 made of rubber material can produce a certain deformation and rebound effect during the flow of the electrolyte, and can more flexibly adapt to the pressure change of the electrolyte, effectively coping with the pressure and impact generated during the flow of the electrolyte. This can not only improve the durability and reliability of the baffle 32, but also ensure that the electrolyte is stably and evenly injected into the battery through the first diversion hole 33, the second diversion hole 34, the third diversion hole and the fourth diversion hole.

[0037] To elaborate on a lower plastic structure for a power battery provided by the present utility model in detail, in the above-mentioned first embodiment, a detailed description of a battery was given. Based on the same inventive concept, the present application also provides a lower plastic structure for a power battery, as shown in Embodiment 2 for details.

[0038] Embodiment 2 of the present utility model provides a battery, and the battery includes the lower plastic structure for a power battery described above.

[0039] The present utility model provides a battery. By respectively arranging a first pole column hole 2, a second pole column hole 21, an explosion-proof valve through-hole 22, and a liquid injection hole 23 on a plastic body 1, the first pole column hole 2, the second pole column hole 21, the explosion-proof valve through-hole 22, and the liquid injection hole 23 are all located on a first side surface 11 of the plastic body 1. The explosion-proof valve through-hole 22 is located between the first pole column hole 2 and the second pole column hole 21, and the liquid injection hole 23 is located between the explosion-proof valve through-hole 22 and the first pole column hole 2. A flow guiding mechanism 3 is arranged on the plastic body 1, and the flow guiding mechanism 3 is located on a second side surface 12. In the flow guiding mechanism 3, a support frame 31 is connected to the plastic body 1, and a baffle 32 is connected to the support frame 31. The baffle 32, the support frame 31, and the plastic body 1 enclose to form a plurality of flow guiding holes, and the plurality of flow guiding holes are respectively communicated with the liquid injection hole 23. In this way, after the electrolyte is pressurized by a liquid injection device and injected through the liquid injection through-hole, when the electrolyte enters the flow guiding mechanism 3, the flow direction of the electrolyte in the flow guiding mechanism 3 is changed, and the electrolyte is injected into the interior of the battery in a dispersed form through the plurality of flow guiding holes, which can effectively disperse the pressure of the electrolyte, avoid the direct impact of high-pressure liquid on the electrode sheets of the battery core, and reduce the risk of internal short circuit of the battery core. At the same time, the dispersed injection method can also improve the distribution uniformity of the electrolyte, which is beneficial to improving the liquid injection efficiency and the output rate of the production equipment. Thus, the technical effect of avoiding the internal short circuit of the battery core caused by the impact of the electrolyte on the electrode sheets of the battery core and being able to improve the liquid injection efficiency of the battery and the output rate of the production equipment is achieved.

[0040] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present utility model and not to limit them. Although the present utility model has been described in detail with reference to the examples, those of ordinary skill in the art should understand that the technical solutions of the present utility model can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present utility model, and they should all be covered within the scope of the claims of the present utility model.

Claims

1. A lower plastic structure for a power battery, characterized in that: The lower plastic structure includes: a plastic body having a first side surface and a second side surface, a first pole hole, a second pole hole, an explosion-proof valve through hole and an injection hole respectively arranged on the plastic body and located on the first side surface, and a flow guide mechanism arranged on the plastic body and located on the second side surface, the explosion-proof valve through hole is located between the first pole hole and the second pole hole, and the injection hole is located between the explosion-proof valve through hole and the first pole hole; the flow guide mechanism includes a support frame connected to the plastic body, and a baffle connected to the support frame, the baffle, the support frame and the plastic body enclose a plurality of flow guide holes connected to the injection hole.

2. The lower plastic structure for a power battery according to claim 1, characterized in that: The plurality of guide holes include a first guide hole, a second guide hole, a third guide hole and a fourth guide hole. The first guide hole and the third guide hole are oppositely distributed, and the second guide hole and the fourth guide hole are oppositely distributed.

3. The lower plastic structure for a power battery according to claim 2, characterized in that: The support frame includes: a first support column, a second support column, a third support column and a fourth support column, the first support column is respectively connected to the plastic body and the baffle; the second support column is respectively connected to the plastic body and the baffle; the third support column is respectively connected to the plastic body and the baffle; the fourth support column is respectively connected to the plastic body and the baffle; wherein the first guide hole is located between the first support column and the second support column, the second guide hole is located between the second support column and the third support column, the third guide hole is located between the third support column and the fourth support column, and the fourth guide hole is located between the fourth support column and the first support column.

4. The lower plastic structure for a power battery according to claim 3, characterized in that: The first supporting column, the second supporting column, the third supporting column and the fourth supporting column are respectively perpendicular to the baffle.

5. The lower plastic structure for a power battery according to claim 4, characterized in that: The baffle is circular, and the first support column, the second support column, the third support column and the fourth support column are symmetrically distributed around the center of the baffle.

6. The lower plastic structure for a power battery according to claim 1, characterized in that: The projection of the support frame on the baffle along the direction of the plastic body close to the baffle is located on the baffle, and the support frame is integrally formed with the baffle.

7. The lower plastic structure for a power battery according to claim 5, characterized in that: The injection hole is directly opposite to the center of the baffle.

8. The lower plastic structure for a power battery according to claim 1, characterized in that: The distance between the baffle and the second side surface has a value ranging from 4.0 mm to 5 mm.

9. The lower plastic structure for a power battery according to claim 1, characterized in that: The baffle is made of rubber material.

10. A battery, characterized in that: The battery comprises a lower plastic structure for a power battery as described in any one of claims 1 to 9.

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