Battery

Abstract

The utility model discloses a battery which comprises the following components: a housing which is provided with a storage cavity and an injection hole, the injection hole is communicated with the storage cavity, and the injection hole is used for injecting curable liquid; the battery cell is arranged in the storage cavity, the battery cell comprises a main body and a tab, the tab is connected to the main body, and a gap is formed between one side, connected with the tab, of the main body and the cavity wall of the storage cavity; and the buffer layer is formed by curing the curable liquid, and the buffer layer is arranged in the gap. The battery provided by the utility model can have relatively high safety.

Description

Technical Field

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

[0002] In the related art, a battery includes a housing, an electric core, and an electrode tab. The electric core is disposed in the housing. One end of the electrode tab is connected to the electric core, and the other end of the electrode tab is connected to a pole column on the housing. Among them, in order to facilitate the welding of the electrode tab and the pole column, there is a certain gap between the electric core and the housing. Further, due to the gap between the electric core and the housing, when the battery drops, the electric core will move in the housing, which may cause the electric core to hit the electrode tab, thereby damaging the battery. Summary of the Utility Model

[0003] The utility model aims to at least solve one of the technical problems existing in the prior art. For this purpose, the utility model provides a battery, which can have high safety.

[0004] The battery according to an embodiment of the utility model includes:

[0005] A housing having a storage cavity and an injection hole, the injection hole communicating with the storage cavity, and the injection hole being used for injecting a curable liquid;

[0006] An electric core disposed in the storage cavity, the electric core including a main body and an electrode tab, the electrode tab being connected to the main body, and there being a gap between the side of the main body connecting the electrode tab and the cavity wall of the storage cavity;

[0007] A buffer layer formed by curing the curable liquid, the buffer layer being disposed in the gap.

[0008] The battery according to an embodiment of the utility model has at least the following beneficial effects: The housing has a storage cavity and an injection hole. Among them, the electric core is disposed in the storage cavity, the injection hole is used for injecting a curable liquid, and there is a gap between the side of the main body connecting the electrode tab and the cavity wall of the storage cavity. In the prior art, when the battery drops or is impacted, this gap will cause damage to the electrode tab. However, in this application, the curable liquid can be injected into the storage cavity through the injection hole, and then the curable liquid cures to form a buffer layer. The buffer layer can fill the gap. That is, after the buffer layer is disposed in the gap, the cured buffer layer can effectively fill the gap, effectively avoiding damage to the electrode tab. Specifically, the battery can have high safety.

[0009] In the battery according to some embodiments of the utility model, the housing is further provided with a discharge hole, the discharge hole communicating with the storage cavity, and the discharge hole being used for extracting the curable liquid.

[0010] A battery according to some embodiments of the present utility model, the housing includes a connection area, a first main body area and a second main body area, the first main body area and the second main body area are respectively connected to two ends of the connection area, the battery further includes a pole column, there are two pole ears, the two pole ears are respectively a first pole ear and a second pole ear, the pole column is connected to the connection area, and the pole column is insulated from the connection area, the first pole ear is connected to the pole column, the second pole ear is connected to the connection area, the injection hole is arranged in the first main body area, and the discharge hole is arranged in the second main body area.

[0011] A battery according to some embodiments of the present utility model, the diameter of the discharge hole is L1, and 0.6mm ≤ L1 ≤ 3mm.

[0012] A battery according to some embodiments of the present utility model, the diameter of the injection hole is L2, and 0.6mm ≤ L2 ≤ 3mm.

[0013] A battery according to some embodiments of the present utility model, along the length direction of the housing, the size of the buffer layer is L3, and 0.6mm ≤ L3 ≤ 5mm.

[0014] A battery according to some embodiments of the present utility model, the volume of the gap is L4, the volume of the buffer layer is L5, and L4 / L5 ≥ 50%.

[0015] A battery according to some embodiments of the present utility model, the buffer layer is further arranged in the injection hole.

[0016] A battery according to some embodiments of the present utility model, the battery further includes a seal, and the seal is arranged in the injection hole.

[0017] A battery according to some embodiments of the present utility model, the curable liquid is set as a thermosetting glue.

[0018] Additional aspects and advantages of the present utility model will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present utility model. Description of the Drawings

[0019] The following further describes the present utility model in conjunction with the drawings and embodiments, where:

[0020] Figure 1 is a schematic diagram of a battery according to some embodiments of the present utility model;

[0021] Figure 2 is a schematic diagram of the housing in the battery according to the first embodiment of the present utility model;

[0022] Figure 3Schematic diagram of the housing in the battery of the second embodiment of the present utility model;

[0023] Reference numerals:

[0024] Battery 10, housing 100, injection hole 110, discharge hole 120, storage cavity 130, connection area 140, first main area 150, second main area 160, battery cell 200, main body 210, tab 220, terminal 300, buffer layer 400. Detailed implementation manners

[0025] The embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary only for explaining the present utility model and should not be construed as limiting the present utility model.

[0026] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the accompanying drawings. This is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

[0027] In the description of the present utility model, the meaning of several is more than one, the meaning of multiple is more than two, greater than, less than, exceeding, etc. are understood as not including the recited number, and above, below, within, etc. are understood as including the recited number. If there is a description of first and second, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence of the indicated technical features.

[0028] In the description of the present utility model, unless otherwise clearly defined, terms such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present utility model in combination with the specific content of the technical solution.

[0029] In the description of the present utility model, the description referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0030] In the related art, the battery 10 includes a housing 100, an electric core 200, and an ear 220. The electric core 200 is disposed in the housing 100. One end of the ear 220 is connected to the electric core 200, and the other end of the ear 220 is connected to a terminal 300 on the housing 100. Among them, in order to facilitate the welding of the ear 220 and the terminal 300, there is a certain gap between the electric core 200 and the housing 100. Further, since there is a gap between the electric core 200 and the housing 100, when the battery 10 drops, the electric core 200 will move in the housing 100, which may cause the electric core 200 to hit the ear 220, thereby damaging the battery 10. For this reason, the present application proposes a battery 10.

[0031] Please refer to Figures 1 to 3 , in some embodiments, the battery 10 includes: a housing 100, an electric core 200, and a buffer layer 400. The housing 100 has a storage cavity 130 and an injection hole 110. The storage cavity 130 is used to place the electric core 200. The battery 10 further includes a cover plate, which can close the storage cavity 130, and the cover plate and the housing 100 together are used to protect the electric core 200. An explosion-proof valve may be provided on the cover plate. The explosion-proof valve is a safety device that automatically opens when the internal pressure of the battery 10 is abnormal or the temperature is too high, releases the internal high-pressure gas, and prevents the battery 10 from exploding. When the internal pressure of the battery 10 rises abnormally due to overcharging, over-discharging, short-circuiting, or external impact, etc., the explosion-proof valve will be automatically triggered and opened, and the accumulated high-pressure gas inside will be released into the external environment, thereby reducing the internal pressure of the battery 10 and preventing the battery 10 from bursting or exploding. The injection hole 110 communicates with the storage cavity 130, and the injection hole 110 is used to inject a curable liquid. Specifically, after the glue enters the storage cavity 130 from the injection hole 110, it can fill the gap. The curable liquid may be a thermosetting glue or a thermosetting gel electrolyte. After the gel electrolyte enters the storage cavity 130 from the injection hole 110, it can store more electrolyte, which is beneficial to improving the cycle life. The injection hole 110 can specifically also inject electrolyte, that is, after the electric core 200 is disposed in the storage cavity 130, electrolyte can be injected into the storage cavity 130.

[0032] In addition, the curable liquid is a type of liquid that can be transformed into a solid state under specific conditions. For example, there are thermosetting glues, thermosetting gel electrolytes, epoxy resins, unsaturated polyester resins, alkyd paints, epoxy adhesives, polyurethane adhesives, liquid rubbers, and photosensitive resins.

[0033] Further, in the following description of the present application, a curable liquid is taken as an example of glue. The battery cell 200 is disposed in the storage cavity 130. The battery cell 200 includes a main body 210 and electrode tabs 220. The main body 210 includes a positive electrode plate, a negative electrode plate, and a separator. After winding or laminating the positive and negative electrode plates and the separator in a specific order (such as negative electrode plate - separator - positive electrode plate or alternating stacking of positive and negative electrode plates and the separator), the main body 210 can be formed. The electrode tabs 220 include a positive electrode tab and a negative electrode tab. The electrode tabs 220 are connected to the main body 210. That is, the positive electrode plate is connected to the positive electrode tab, and the negative electrode plate is connected to the negative electrode tab. There is a gap between the side of the main body 210 connected to the electrode tabs 220 and the cavity wall of the storage cavity 130. Leaving the gap is convenient for welding the electrode tabs 220 and the terminal posts 300, or for welding the electrode tabs 220 and the housing 100. The buffer layer 400 is formed by curing the curable liquid, and the buffer layer 400 is disposed in the gap. Specifically, the housing 100 has a storage cavity 130 and an injection hole 110. Among them, the battery cell 200 is disposed in the storage cavity 130, and the injection hole 110 is used to inject the curable liquid. There is a gap between the side of the main body 210 connected to the electrode tabs 220 and the cavity wall of the storage cavity 130. In the prior art, when the battery 10 drops or is impacted, this gap may cause damage to the electrode tabs 220. However, in the present application, the curable liquid can be injected into the storage cavity 130 through the injection hole 110, and then the curable liquid cures to form the buffer layer 400. The buffer layer 400 can fill the gap. That is, after the buffer layer 400 is disposed in the gap, the cured buffer layer 400 can effectively fill the gap, effectively avoiding damage to the electrode tabs 220. Specifically, the battery 10 can have high safety.

[0034] Next, the buffer layer 400 is described again. Among them, the buffer layer 400 is a liquid before curing. The glue can enter the storage cavity 130 through the injection hole 110. Specifically, the glue enters the gap between the side of the main body 210 connected to the electrode tabs 220 and the cavity wall of the storage cavity 130. The buffer layer 400 formed by curing the glue can play a buffering effect. The two ends of the buffer layer 400 can respectively abut against the cavity wall of the storage cavity 130 and the main body 210, thereby effectively preventing the main body 210 from moving in the storage cavity 130 and further preventing the main body 210 from damaging the electrode tabs 220. It should be noted that since the buffer layer 400 is formed by injecting glue into the storage cavity 130 and curing, when the glue is first injected into the storage cavity 130, the glue can fill the gap between the main body 210 and the cavity wall of the storage cavity 130. After the glue cures, the main body 210 will be fixed in the storage cavity 130. In addition, the buffer layer 400 can also wrap the electrode tabs 220, achieving the effect of insulating the electrode tabs 220 and the housing 100.

[0035] The following is illustrated by a table. The assembled battery 10 is subjected to a six-sided and four-corner drop test for a total of 5 rounds. It is required that the battery 10 does not explode, catch fire, leak liquid, and the voltage drop does not exceed 0.1 V and the internal resistance change does not exceed 10% after 24 hours. From the results in the following table, it can be seen that since the buffer layer 400 is formed by curing a curable liquid, when the curable liquid is injected, it is in a fluid state and can fill the gap. After the curable liquid solidifies, it can better fit the cell 200 and the cavity wall of the storage cavity 130 to buffer the damage caused by dropping.

[0036] Embodiment Treatment measure Test result Embodiment 1 No treatment Battery catches fire Embodiment 2 Install a buffer sheet in the gap The internal resistance changes by more than 10% after 24 hours Embodiment 3 Inject thermosetting glue into the gap Pass the test Embodiment 4 Inject thermosetting gel electrolyte into the gap Pass the test

[0037] Table 1

[0038] Furthermore, please refer to Figures 1 to 3 , in some embodiments, the housing 100 is further provided with a discharge hole 120 which communicates with the storage cavity 130, and the discharge hole 120 is used to extract the curable liquid. Specifically, taking the curable liquid as glue as an example, by providing an injection hole 110 and a discharge hole 120 on the housing 100, this can make the glue fully fill the gap. That is, when injecting glue into the storage cavity 130 through the injection hole 110, the glue can be extracted at the discharge hole 120. In this way, through the combined cooperation of the injection hole 110 and the discharge hole 120, the glue can be completely filled in the gap. The use process of the injection hole 110 and the discharge hole 120 can be that the glue injection tool is connected to the injection hole 110, the glue extraction tool is connected to the discharge hole 120, and then while injecting glue into the storage cavity 130 through the injection hole 110, the fluid in the storage cavity 130 is extracted through the discharge hole 120. At the beginning, the gas is extracted from the discharge hole 120. After that, when the glue is extracted from the discharge hole 120, it can be judged that the glue has filled the gap and the glue injection is completed.

[0039] The following introduces the manufacturing process of the battery 10. Taking the curable liquid as glue as an example, after the cell 200 is manufactured, the cell 200 is put into the housing, then the ear 220 is welded to the housing 100, the ear 220 is welded to the terminal 300, the cover plate is welded to the housing 100, the electrolyte is injected, and it is left standing and formed; then, a thermosetting glue or a thermosetting gel electrolyte is injected into the injection hole 110, and then negative pressure drainage is carried out at the discharge hole 120 to guide the flow of the glue or the gel electrolyte so that the glue or the gel electrolyte only flows in the gap to prevent the glue from entering the inside of the electrode sheet and causing capacity loss; when the glue or the gel electrolyte starts to be extracted from the discharge hole 120, the glue injection is stopped, and the laminate is heated to the thermosetting temperature to make the glue completely solidify and complete the glue injection process. Since the glue itself will seal the injection hole 110 and the discharge hole 120 when it solidifies, there is no need for subsequent sealing nail welding. If a gel electrolyte is used, after the gel is completed, the injection hole 110 and the discharge hole 120 can be welded and sealed with a sealing nail.

[0040] Further, please refer to Figures 1 to 3 , in some embodiments, the housing 100 includes a connection area 140, a first main body area 150, and a second main body area 160. That the housing 100 includes the connection area 140, the first main body area 150, and the second main body area 160 may specifically mean that the side walls of the housing 100 include the connection area 140, the first main body area 150, and the second main body area 160. The shape of the housing 100 may be a cuboid. The housing 100 includes four side walls and a bottom wall, and the four side walls together surround and connect to the bottom wall to form a storage cavity 130. The first main body area 150 and the second main body area 160 are respectively connected to both ends of the connection area 140. That is, the same side wall may include the connection area 140, the first main body area 150, and the second main body area 160. Specifically, please refer to Figure 2 , or, one side wall includes the connection area 140, one side wall includes the first main body area 150, and one side wall includes the second main body area 160. Specifically, please refer to Figure 3 . The battery 10 further includes a terminal 300. There are two tab ears 220, and the two tab ears 220 are respectively a first tab ear and a second tab ear. The first tab ear may be a positive tab ear or a negative tab ear. The second tab ear may be a positive tab ear or a negative tab ear. The terminal 300 is connected to the connection area 140, and the terminal 300 is insulated from the connection area 140. The first tab ear is connected to the terminal 300, and the second tab ear is connected to the connection area 140. That is, the positive tab ear can be welded to the terminal 300, and the negative tab ear can be welded to the housing 100, so that the housing 100 is negatively charged and the terminal 300 is positively charged. Or, the negative tab ear can be welded to the terminal 300, and the positive tab ear can be welded to the housing 100, so that the housing 100 is positively charged and the terminal 300 is negatively charged. The injection hole 110 is provided in the first main body area 150, and the discharge hole 120 is provided in the second main body area 160. Specifically, since the injection hole 110 and the discharge hole 120 are respectively on both sides of the connection area 140, that is, the injection hole 110 and the discharge hole 120 are respectively on both sides of the tab ear 220. Therefore, taking the curable liquid as glue as an example, when the glue enters the storage cavity 130, the glue can pass through the tab ear 220, thereby wrapping the tab ear 220 and protecting the tab ear 220.

[0041] Further, in some embodiments, the diameter of the discharge hole 120 is L1, where 0.6 mm ≤ L1 ≤ 3 mm. Specifically, the diameter of the discharge hole 120 can be 0.6 mm, 0.8 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, or 3 mm. When the diameter of the discharge hole 120 is less than 0.6 mm, since the diameter of the discharge hole 120 is too small, the velocity of the discharged fluid is slow, which results in low efficiency. When the diameter of the discharge hole 120 is greater than 3 mm, since the diameter of the discharge hole 120 is too large, the sealing effect will be poor during subsequent sealing.

[0042] Further, in some embodiments, the diameter of the injection hole 110 is L2, where 0.6 mm ≤ L2 ≤ 3 mm. Specifically, the diameter of the injection hole 110 can be 0.6 mm, 0.8 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, or 3 mm. When the diameter of the injection hole 110 is less than 0.6 mm, since the diameter of the injection hole 110 is too small, the velocity of the fluid injected into the storage cavity 130 is slow, which results in low efficiency. When the diameter of the injection hole 110 is greater than 3 mm, since the diameter of the injection hole 110 is too large, the sealing effect will be poor during subsequent sealing.

[0043] Further, in some embodiments, along the length direction of the housing 100, the size of the buffer layer 400 is L3, where 0.6 mm ≤ L3 ≤ 5 mm. Specifically, the size of the buffer layer 400 can be 0.6 mm, 0.8 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 4 mm, or 5 mm. When the size of the buffer layer 400 is less than 0.6 mm, since the size of the buffer layer 400 is too small, the buffering performance of the buffer layer 400 is poor, and thus the tab 220 cannot be effectively protected. In addition, the size of the buffer layer 400 is indirectly equal to the size of the gap. If the size of the gap is too small, it will be particularly inconvenient to weld the tab 220 to the terminal 300 and the tab 220 to the housing 100. When the size of the buffer layer 400 is greater than 5 mm, the size of the buffer layer 400 is large, which will cause the buffer layer 400 to occupy too much space in the storage cavity 130 and the battery cell 200 to occupy too little space in the storage cavity 130, thereby reducing the energy density of the battery 10.

[0044] Further, in some embodiments, the volume of the gap is L4, and the volume of the buffer layer 400 is L5, where L4 / L5 ≥ 50%. Specifically, the volume of the buffer layer 400 filling the gap can be such that the volume of the buffer layer 400 is 50%, 70%, 80%, 90%, or 100% of the volume of the gap. The advantages of L4 / L5 ≥ 50% are demonstrated by the following table. Here, the buffer layer 400 is disposed in the gap. Taking the curable liquid as glue as an example, since the buffer layer 400 is formed by curing the glue, the volume ratio of the buffer layer 400 to the gap can be referred to as the filling rate of the glue in the gap. For example, when the volume of the buffer layer 400 is 50% of the volume of the gap, specifically, the filling rate of the glue is 50%. The test method is to conduct a six-sided and four-corner drop test on the assembled battery 10 for a total of 5 rounds, requiring that the battery 10 does not explode, catch fire, leak liquid, and the voltage drop does not exceed 0.1V and the internal resistance change does not exceed 10% after 24 hours. From the results in the following table, it can be seen that when the filling rate is not less than 50%, the buffer layer 400 can provide a good buffering effect on the battery cell 200, thereby protecting the battery cell 200. In this way, the safety of the battery 10 is relatively high.

[0045] Embodiment Treatment measure Test result Embodiment 1 The glue filling rate is 40% The internal resistance changes by more than 10% after 24 hours Embodiment 2 The glue filling rate is 50% Pass the test Embodiment 3 The glue filling rate is 60% Pass the test Embodiment 4 The glue filling rate is 70% Pass the test Embodiment 5 The glue filling rate is 80% Pass the test

[0046] Table 2

[0047] Further, after the discharge hole 120 and the injection hole 110 are provided, it can be envisioned that after injecting the curable liquid, the discharge hole 120 and the injection hole 110 need to be sealed. Specifically, in some embodiments, the buffer layer 400 is also disposed in the injection hole 110. Taking the curable liquid as glue as an example, after the glue cures, the glue can be disposed in the injection hole 110, thereby achieving a sealing effect, which can save costs and eliminates the need for workers to use a seal. Similarly, in some embodiments, the buffer layer 400 is also disposed in the discharge hole 120.

[0048] Further, in addition to the above-mentioned method of sealing by curing the glue into the buffer layer 400, a sealing member can also be used for sealing. In some embodiments, the battery 10 further includes a sealing member, and the sealing member is disposed in the injection hole 110. The sealing member can be a sealing nail, and the sealing nail is inserted into the injection hole 110 and can be welded to the housing 100 to seal the injection hole 110. Similarly, in some embodiments, the sealing member is also disposed in the discharge hole 120.

[0049] Furthermore, in some embodiments, the glue is set as a thermosetting glue. Specifically, the thermosetting glue is mainly composed of a resin and a curing agent. The resin can be phenolic resin, epoxy resin, alkyd resin, etc., and the curing agent can be substances such as acids, alkalis, and phenols. The working process of the thermosetting glue includes three stages: heating, flowing, and curing: Heating: When the glue is heated to a certain temperature, the resin and the curing agent start to react and release heat. Flowing: While heating, the glue begins to become viscous and can flow because the resin and the curing agent are reacting and curing to form a harder structure. Curing: When the reaction between the resin and the curing agent reaches a certain degree, the thermosetting glue starts to cure and becomes very hard. The molecules of the curing agent will crosslink with the resin molecules to form a high-molecular compound, which is not easily damaged by external environmental factors. Thus, when the thermosetting glue is in a liquid state, it can be conveniently injected into the storage cavity 130, and after the thermosetting glue cures, a buffer layer 400 is formed to protect the tab 220.

[0050] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the gist of the present invention within the knowledge scope of those of ordinary skill in the art. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

Claims

1. A battery, characterized in that, Comprising: A housing having a storage cavity and an injection hole, the injection hole communicating with the storage cavity, the injection hole being for injecting a curable liquid; A battery cell disposed in the storage cavity, the battery cell including a main body and a tab, the tab being connected to the main body, and there being a gap between a side of the main body where the tab is connected and the cavity wall of the storage cavity; A buffer layer formed by curing the curable liquid, the buffer layer being disposed in the gap.

2. The battery according to claim 1, wherein The housing is further provided with a discharge hole, the discharge hole communicating with the storage cavity, the discharge hole being for extracting the curable liquid.

3. The battery according to claim 2, wherein The housing includes a connection area, a first main body area and a second main body area, the first main body area and the second main body area are respectively connected to two ends of the connection area, the battery further includes a terminal post, there are two tabs, the two tabs are respectively a first tab and a second tab, the terminal post is connected to the connection area, and the terminal post is insulated from the connection area, the first tab is connected to the terminal post, the second tab is connected to the connection area, the injection hole is disposed in the first main body area, and the discharge hole is disposed in the second main body area.

4. The battery according to claim 2, characterized in that, The diameter of the discharge hole is L1, 0.6 mm ≤ L1 ≤ 3 mm.

5. The battery according to claim 1, wherein The diameter of the injection hole is L2, 0.6 mm ≤ L2 ≤ 3 mm.

6. The battery according to claim 1, characterized in that, Along the length direction of the housing, the size of the buffer layer is L3, 0.6 mm ≤ L3 ≤ 5 mm.

7. The battery according to claim 1, wherein, The volume of the gap is L4, the volume of the buffer layer is L5, L4 / L5 ≥ 50%.

8. The battery according to claim 1, characterized in that, The buffer layer is further disposed in the injection hole.

9. The battery according to claim 1, wherein The battery further includes a seal, the seal being disposed in the injection hole.

10. The battery according to claim 1, characterized in that, The curable liquid is set as a thermosetting glue.

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