Power battery and equipment applying same

Abstract

The utility model discloses a power battery and equipment applying the power battery, the power battery comprises a shell, a pole core and an elastic sheet, the shell is provided with an inner cavity, the pole core is placed in the inner cavity, the elastic sheet is arranged on the side wall of the inner cavity, in the thickness direction of the pole core, the elastic sheet is arranged between the pole core and the shell, and when the pole core expands, the elastic sheet is arranged on the side wall of the inner cavity. The elastic sheet is extruded by the pole core and generates elastic deformation, and meanwhile, the pole core is correspondingly extruded by the elastic sheet, so that the elastic sheet can provide a certain expansion space for the pole core through the elastic deformation of the elastic sheet, and meanwhile, the elastic sheet can extrude the pole core due to the trend of recovering a natural state; therefore, a certain constraint effect is formed on the pole shank, and the constraint effect is beneficial to discharge of gas in the pole shank, so that the cycle life of the power battery is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of power batteries, in particular to a power battery and equipment using the power battery. Background Art

[0002] Power batteries have the advantages of high energy density, high capacity, small size and environmental protection. They are currently widely used in the field of new energy equipment. In order to ensure the safety performance and cycle life of power batteries, a certain amount of space must be reserved inside the power batteries to ensure that a certain amount of space is reserved for the expansion of the pole pieces during the battery charging and discharging process.

[0003] However, during the charge and discharge process of the existing power battery, especially during the formation process of the existing power battery, a large amount of gas will be generated when the pole core reacts with the electrolyte. These gases may be retained between the pole pieces of the pole core, reducing the contact area between the pole pieces and the solid electrolyte layer. Moreover, as the formation reaction continues, the gas is difficult to be discharged from between the pole pieces and continues to accumulate between the pole pieces, resulting in the continuous expansion of the pole core, causing the gas pressure in the inner cavity of the power battery to continue to increase, and even breaking through the explosion-proof valve, seriously affecting the safety of battery use. Utility Model Content

[0004] In view of this, the present application provides a power battery and a device using the power battery. By adding an elastic sheet to the inner wall of the power battery, the elastic sheet can provide a certain pressure when the battery core expands, so as to restrain the expansion of the core and make it easier to discharge the gas between the cores, thereby solving the above-mentioned technical problems.

[0005] A first aspect of an embodiment of the present application provides a power battery, comprising an outer shell, a pole core and an elastic sheet, wherein the outer shell is provided with an inner cavity, the pole core is placed in the inner cavity, the elastic sheet is provided on the side wall of the inner cavity, and in the thickness direction of the pole core, the elastic sheet is located between the pole core and the outer shell, when the pole core expands, the elastic sheet is squeezed by the pole core and undergoes elastic deformation, and at the same time, the pole core is correspondingly squeezed by the elastic sheet to constrain the elastic deformation of the pole core during the charging and discharging process.

[0006] In the present application, the elastic sheet can not only provide a certain avoidance space for the expansion of the pole core through its own elastic deformation, but also squeeze the expanded pole core so that the pole core is subjected to a certain squeezing force. Therefore, the gas between the pole pieces can leave the space between the pole pieces under the pressure exerted by the elastic sheet, enter the inner cavity, and then be discharged from the safety valve of the battery. Therefore, the contact area between the pole piece and the electrolyte will not be reduced due to the interference of the gas, and the pole piece and the electrolyte can maintain a good contact state, which improves the safety of the power battery while ensuring the performance of the power battery.

[0007] In some embodiments of the first aspect, when the pole core expands to the maximum extent, the pole core squeezes the elastic sheet. At this time, in the thickness direction of the pole core, the minimum thickness of the elastic sheet is greater than or equal to the thickness of the elastic sheet when the maximum elastic deformation occurs. In this way, when the pole core expands, the elastic sheet can always undergo elastic deformation.

[0008] In some embodiments of the first aspect, in the thickness direction of the pole core, the ratio of the distance between the pole core and the inner wall of the shell to the thickness change of the elastic sheet is greater than or equal to 0.94 and less than or equal to 1.15, so that the elastic sheet can always remain elastic during the operation of the power battery.

[0009] In some embodiments of the first aspect, along the height direction of the pole core, the size of the elastic sheet is greater than the height of the pole core; along the length direction of the pole core, the size of the elastic sheet is greater than the size of the pole core, so that in the process of the pole core squeezing the elastic sheet, each surface of the pole core can be uniformly elastically constrained.

[0010] In some embodiments of the first aspect, along the height direction of the pole core, the ratio of the size of the elastic sheet to the size of the pole core is less than or equal to 1.05, so as to reduce the consumables of the elastic sheet and reduce the cost of the elastic sheet.

[0011] In some embodiments of the first aspect, along the length direction of the pole core, the ratio of the size of the elastic sheet to the size of the pole core is less than or equal to 1.05, so as to reduce the consumables of the elastic sheet and reduce the cost of the elastic sheet.

[0012] In some embodiments of the first aspect, a liquid storage cavity is formed on a surface of the elastic sheet facing the pole core to replenish the electrolyte required by the power battery.

[0013] In some embodiments of the first aspect, a liquid storage membrane is connected to the surface of the elastic sheet facing the pole core, and a liquid storage cavity is formed inside the membrane body of the liquid storage membrane, wherein the liquid storage membrane is a porous insulating membrane, and the liquid storage membrane can be squeezed to precipitate electrolyte and can also absorb electrolyte for secondary storage, so that continuous electrolysis reaction can be carried out inside the power battery.

[0014] In some embodiments of the first aspect, an elastic sheet is correspondingly connected to a liquid storage membrane, so that more electrolyte can be stored in the power battery.

[0015] In some embodiments of the first aspect, the liquid storage membrane and the elastic sheet are concentrically arranged, and the membrane surface area of ​​the liquid storage membrane is greater than or equal to 2 / 3 of the surface area of ​​the elastic sheet. In this way, the contact area between the electrode core and the liquid storage membrane can be guaranteed, and the storage amount of the electrolyte in the inner cavity can also be guaranteed, which is beneficial to promote the electrolysis reaction of the electrode core.

[0016] In some embodiments of the first aspect, the liquid storage membrane is bonded to the elastic sheet to facilitate a user to mount the liquid storage membrane on the surface of the elastic sheet.

[0017] In some embodiments of the first aspect, the surface of the elastic sheet is a planar structure, and the surface of the elastic sheet and the connecting surface of the shell are parallel to each other, so that the elastic sheet and the shell maintain a good connection state.

[0018] In some embodiments of the first aspect, the elastic sheet is a silicone sheet, so that the elastic sheet has a longer service life.

[0019] In some embodiments of the first aspect, in the thickness direction of the pole core, an elastic sheet is connected to the two opposite side walls of the inner cavity, and the two elastic sheets are symmetrically distributed on both sides of the pole core, so that both sides of the pole core can be elastically constrained by the elastic sheet, which is more conducive to the discharge of the gas inside the pole core and enhances the safety performance of the power battery.

[0020] A second aspect of an embodiment of the present application provides a device, including a battery compartment and the power battery mentioned above, wherein the power battery is installed in the battery compartment, so that the power battery can better ensure the operation effect of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is a schematic diagram of the structure of a power battery in one embodiment of the present application;

[0023] Figure 2 for Figure 1 Structural diagram of the AA section;

[0024] Figure 3 for Figure 2 The enlarged view of point B in the middle;

[0025] Figure 4 The present invention is a schematic diagram of the partial structure of a cross section of a device body.

[0026] Description of the accompanying figures: 1-power battery, 2-equipment body, 2a-battery compartment, 10-housing, 11-inner cavity, 20-pole core, 30-elastic sheet, 40-liquid storage membrane, T1-distance between pole core and inner wall of housing, W cell - Actual thickness of the core, W min -Incompressible thickness of the core, W g1 - Initial thickness of the elastic sheet, W g2 - Minimum compression thickness of the elastic sheet, W m-The thickness of the liquid storage membrane, L1-the length of the elastic sheet, L2-the length of the pole core, H1-the height of the pole core, H2-the height of the elastic sheet, H3-the height of the liquid storage membrane, F1-thickness direction, F2-height direction, F3-length direction. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application is clearly and completely described below in conjunction with the drawings of the embodiments of the present application. Obviously, the described embodiments are only embodiments of a part of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of this application.

[0028] Unless otherwise defined, the technical or scientific terms used herein shall have the usual meaning as understood by a person of ordinary skill in the field to which this application belongs. The words "one", "an" or "the" and the like used in this application do not indicate a quantitative limitation, but are only used to indicate the presence of at least one. The words "include" or "comprise" and the like mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. The words "connect" or "connected" and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0029] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0030] The following will be combined with the attached examples of the present application Figure 1-Figure 3 , clearly and completely describe each technical solution in the embodiments of the present application, wherein: Figure 1 , Figure 2 , Figure 3 The thickness direction of the power battery (core 20) is schematically indicated by F1. Figure 1 The height direction of the power battery (core 20) is also marked by F2, and the length direction of the power battery (core 20) is marked by F3 for readers' reference to facilitate understanding of the contents described in subsequent embodiments.

[0031] Please refer to Figure 1 , Figure 1This is an embodiment of a power battery 1 mentioned in the present application, which includes an outer shell 10, a pole core 20 and an elastic sheet 30, wherein the outer shell 10 is provided with an inner cavity 11, the movement is placed in the inner cavity 11, and the elastic sheet 30 is arranged on the side wall of the inner cavity 11, in the thickness direction F1 of the pole core 20, the elastic sheet 30 is located between the pole core 20 and the outer shell 10, when the pole core 20 expands, the elastic sheet 30 is squeezed by the pole core 20 and undergoes elastic deformation, and at the same time, the pole core 20 is also correspondingly squeezed by the elastic sheet 30.

[0032] In the present application, when the pole core 20 expands, the pole core 20 squeezes the elastic sheet 30, and the elastic sheet 30 can provide a certain avoidance space for the expansion of the pole core 20 through its own elastic deformation, so as to avoid the pole core 20 directly squeezing the inner wall of the shell 10 when expanding, breaking the shell 10, and causing safety hazards; in addition, when the pole core 20 squeezes the elastic sheet 30, the elastic potential energy generated by the deformation of the elastic sheet 30 makes the elastic sheet 30 have a tendency to recover to the initial shape (that is, the state when the elastic sheet 30 is not squeezed by external force), so that the elastic sheet 30 exerts a certain squeezing effect on the expanded pole core 20. Because the pole core 20 is subjected to a certain squeezing force, the gas between the pole pieces is more likely to overflow the space between the pole pieces under the action of the squeezing force and enter the inner cavity 11, and then can be discharged from the safety valve of the power battery 1, so that the contact area between the pole piece and the electrolyte will not be reduced due to the interference of the gas, and the pole piece and the electrolyte can maintain a good contact state, which improves the safety of the power battery 1 and ensures the performance of the power battery 1.

[0033] It should be explained that the pole core 20 includes a positive electrode sheet, a negative electrode sheet, an ion separator and positive and negative electrolyte layers, wherein the ion separator is located between the positive electrode sheet and the negative electrode sheet, the positive electrolyte layer is located between the positive electrode sheet and the ion separator, and the negative electrolyte layer is located between the negative electrode sheet and the ion separator. When the power battery 1 is in operation, the positive and negative electrolyte layers will be electrolyzed to generate gas. Since this part of the gas is continuously generated during the operation of the power battery 1, in the initial stage of gas generation, the gas pressure formed by the gas is small, and it is difficult for the gas to overflow from the space between the ion separator and the pole piece to the inner cavity 11, resulting in gas The gas is retained between the pole piece and the electrolyte layer. As a result, due to the retention of gas, the gas will separate the pole piece and the electrolyte layer where it is located, resulting in a smaller contact area between the pole piece and the electrolyte layer, thereby affecting the electrolysis reaction between the pole piece and the electrolyte layer, making it difficult for the power battery 1 to fully exert its performance; and because the gas pressure is relatively low, the gas generated by the continuous electrolysis reaction is easy to gather between the pole piece and the electrolyte layer, thereby causing the pole core 20 to expand in volume. If the gas continues to accumulate and cannot be discharged outside the pole core 20, the pole core 20 will over-expand and burst the shell 10, causing serious safety problems. In the present application, the elastic sheet 30 will squeeze the pole core 20 while the pole core 20 expands and squeezes itself. The gas inside the pole core 20 will easily overflow from the pole piece and the electrolyte layer due to the external force squeezing. Therefore, the volume of the pole core 20 will not expand excessively, and the interference of the gas on the contact area between the pole piece and the electrolyte layer is reduced, reducing the impact caused by the gas gathering in the pole core 20, and improving the safety of the power battery 1 and the performance that the power battery 1 can exert.

[0034] In some embodiments, when the pole core 20 expands to the maximum extent, the pole core 20 squeezes the elastic sheet 30. At this time, in the thickness direction F1 of the pole core 20, the minimum thickness of the elastic sheet 30 is greater than or equal to the thickness of the elastic sheet 30 when the maximum elastic deformation occurs. In this way, when the pole core 20 expands, the elastic sheet 30 is always kept in the elastic deformation state during the process of being squeezed by the pole core 20. When the pole core 20 expands to the maximum volume, the elastic sheet 30 is still in the elastic deformation stage, that is, the pole core 20 and the inner wall of the shell 10 always maintain elastic contact (soft contact), and the pole core 20 is difficult to break through the shell 10, or the pole core 20 will not be deformed or damaged due to hard contact with the shell 10, thereby further ensuring the power battery 1 In addition, since the restraining effect of the elastic sheet 30 on the pole core 20 increases with the increase of its own deformation, as the expansion of the pole core 20 increases, the restraining effect of the elastic sheet 30 on the pole core 20 will increase accordingly, and as the volume of the pole core 20 expands, the amount of gas that can be accumulated between the pole cores 20 increases, and since the restraining effect of the elastic sheet 30 on the pole core 20 always increases with the increase of the volume expansion of the pole core 20, the squeezing effect on the pole core 20 will increase with the increase of its own volume. In this way, the gas between the pole cores 20 is difficult to accumulate, and the elastic sheet 30 always maintains the ability to dynamically regulate the internal air pressure of the pole core 20, thereby improving the safety of the power battery 1.

[0035] Based on the above embodiment, further, in the thickness direction F1 of the pole core 20, the ratio of the distance T1 between the pole core 20 and the inner wall of the shell 10 to the thickness change of the elastic sheet 30 is greater than or equal to 0.94 and less than or equal to 1.15 to ensure the function of the elastic sheet 30.

[0036] Now further combined Figure 2 and Figure 3 The above embodiment is described in detail, wherein: Figures 1 to 3 Symbols are marked for multiple dimensions, such as: T1 is used to represent "the distance T1 between the pole core 20 and the inner wall of the shell 10", so that readers can better understand the subsequent content.

[0037] It should be understood that Figure 2 , Figure 3 In the figure, the change in the thickness of the pole core 20 is the actual thickness W of the pole core 20. cell and the incompressible thickness W of the pole core 20 min The maximum change in thickness of the elastic sheet 30 is the initial thickness W of the elastic sheet 30. g1 and the minimum compression thickness W of the elastic sheet 30 g2As the pole core 20 expands, the spacing T1 between the pole core 20 and the inner wall of the shell 10 gradually decreases, and then the pole core 20 compresses the elastic sheet 30, causing the thickness of the elastic sheet 30 to change, so that the elastic sheet 30 provides a certain escape space for the expansion of the pole core 20, but because the elastic deformation capacity of the elastic sheet 30 is limited, when the elastic sheet 30 undergoes the maximum deformation, if the elastic sheet 30 continues to be squeezed by the pole core 20, the pole core 20 and the elastic sheet 30 change from elastic contact to hard contact, and both the pole core 20 and the shell 10 may be damaged; in addition, because the gas generated by electrolysis interferes with the normal operation of the pole core 20, the pole core 20 needs to be elastically constrained by the elastic sheet 30 when it expands, so as to discharge the gas, so it is necessary to reasonably set the spacing between the pole core 20 and the elastic sheet 30 to ensure that the elastic sheet 30 can play its role. In the above embodiment, when the ratio of the distance T1 between the pole core 20 and the inner wall of the shell 10 to the thickness variation of the elastic sheet 30 is equal to 0.94, when the power battery 1 is not in operation, the elastic sheet 30 is in an extruded state, and the elastic sheet 30 can always provide a certain elastic constraint to the pole core 20 to reduce the gas accumulation inside the pole core 20; when the ratio of the distance T1 between the pole core 20 and the inner wall of the shell 10 to the thickness variation of the elastic sheet 30 is greater than 0.94 and less than 1.15, the pole core 20 In the expansion state, the pole core 20 squeezes the elastic sheet 30, and the elastic sheet 30 is always in an elastic deformation state; when the ratio of the distance T1 between the pole core 20 and the inner wall of the shell 10 to the thickness change of the elastic sheet 30 is equal to 1.15, the elastic sheet 30 is in the maximum deformation state. At this time, if the pole core 20 continues to expand and squeeze the elastic sheet 30, the elastic sheet 30 will not continue to deform, and the pole core 20 and the elastic sheet 30 become hard contact. For ease of understanding, the above content can be expressed by an inequality: 0.94≤(W cell -W min ) / (W g1 -W g2 )*2≤1.15, thus, the safety performance of the power battery 1 is improved.

[0038] Please refer to Figure 1 and Figure 2 In some embodiments, along the height direction F2 of the pole core 20, the size of the elastic sheet 30 is greater than the height H1 of the pole core 20, that is, Figure 2 The height H2 of the elastic sheet 30 shown in FIG. 1 is greater than the height H1 of the pole core 20 ; along the length direction F3 of the pole core 20 , the size of the elastic sheet 30 is greater than the size of the pole core 20 , that is, Figure 1In the power battery 1 shown in the figure, in the length direction F3 of the pole core 20, the length L1 of the elastic sheet 30 is greater than the length L2 of the pole core 20. In this way, when the pole core 20 expands and squeezes the elastic sheet 30, the outer side of the pole core 20 is covered by the elastic sheet 30, so that the elastic sheet 30 can exert a uniform squeezing effect on each area of ​​the pole core 20, so that the gas in each area of ​​the pole core 20 is subjected to a similar squeezing effect, thereby overflowing the pole core 20, thereby avoiding the accumulation of gas inside the pole core 20.

[0039] In some embodiments, the size of the elastic sheet 30 in the direction F2 along the height H1 of the pole core 20 ( Figure 2 The height H2 of the elastic sheet 30 and the size of the pole core 20 ( Figure 2 The ratio of the height H1 of the middle pole core 20 is less than or equal to 1.05, that is, while ensuring the compatibility of the elastic sheet 30 and the pole core 20, it is also possible to reduce the space occupied by the elastic sheet 30 in the inner cavity 11 and its own manufacturing cost (reduction in consumables). In this way, the elastic sheet 30 can ensure that it covers all surface areas of the pole core 20 in its height direction F2, and can also reduce the size of the power battery 1 (or the outer shell 10) to a certain extent.

[0040] In some other embodiments, along the length direction F3 of the pole core 20, the size of the elastic sheet 30 ( Figure 1 The length L1 of the elastic sheet 30 and the size of the pole core 20 ( Figure 1 The ratio of the length L2 of the middle pole core 20 is less than or equal to 1.05, that is, while ensuring the compatibility of the elastic sheet 30 and the pole core 20, it is also possible to reduce the space occupied by the elastic sheet 30 in the inner cavity 11 and its own manufacturing cost (reduction in consumables). In this way, the elastic sheet 30 can ensure that it covers all surface areas of the pole core 20 in its height direction F2, and can also reduce the size of the power battery 1 (or the outer shell 10) to a certain extent.

[0041] Please refer to Figure 1 and Figure 2 In some embodiments, a liquid storage cavity is formed on the surface of the elastic sheet 30 facing the pole core 20, and the electrolyte required for the operation of the power battery 1 is stored in the liquid storage cavity. When the pole core 20 squeezes the elastic sheet 30, the liquid in the liquid storage cavity is squeezed out and participates in the electrolysis reaction of the pole core 20. The electrolyte can increase the service life of the power battery 1 to a certain extent. When the consumption of the electrolyte layer inside the pole core 20 is high, the electrolyte can replace the electrolyte layer to a certain extent and participate in the electrolysis reaction of the pole core 20, thereby ensuring the use effect of the power battery 1.

[0042] It should be noted that, since the electrolytic material of the electrolyte layer will be gradually consumed as the electrolysis reaction proceeds, in the existing power battery 1, a certain amount of electrolyte is usually installed at the bottom of the inner cavity 11 to promote the electrochemical reaction inside the power battery 1 and maintain the electrolysis balance inside the power battery 1, thereby ensuring that the power battery 1 can continuously provide electrical energy. That is, the electrolyte mostly plays the role of assisting the electrolysis reaction in the power battery 1, and its main purpose is to promote the electrochemical reaction and electrolysis balance inside the power battery 1.

[0043] Furthermore, in some embodiments, a liquid storage membrane 40 is connected to the surface of the elastic sheet 30 facing the pole core 20, and a liquid storage cavity is formed inside the membrane body of the liquid storage membrane 40, wherein the liquid storage membrane 40 is a porous insulating membrane, so that when the pole core 20 expands to squeeze the liquid storage membrane 40, the liquid storage membrane 40 will precipitate electrolyte accordingly, and when the pole core 20 shrinks, the liquid storage membrane 40 can also absorb the electrolyte to perform secondary storage on the electrolyte flowing out of the liquid storage cavity, so that a certain amount of electrolyte that does not participate in the electrolysis reaction can be stored in the liquid storage cavity, thereby maintaining the function of the electrolyte, improving the use effect of the electrolyte, and the completeness of the electrolyte in the electrochemical reaction, so that the electrochemical reaction inside the power battery 1 is promoted, and the service life of the power battery 1 is extended to a certain extent.

[0044] For reference Figure 3 In some embodiments, considering that the liquid storage film 40 occupies a certain space of the inner cavity 11 and its deformation ability after being squeezed is weak, it is difficult to ignore the space occupied by the liquid storage film 40 in the inner cavity 11. Therefore, in order to reduce the influence of the thickness of the liquid storage film 40 on the deformation of the elastic sheet 30, the thickness Wm of the liquid storage film 40 should be included in the factors affecting the thickness of the elastic film, that is, 0.94≤(W cell -W min -W m ) / (W g1 -W g2 )*2≤1.15 to ensure the safety performance of the power battery 1.

[0045] Furthermore, in some embodiments, an elastic sheet 30 is connected to a liquid storage membrane 40, so that more electrolyte can be stored in the power battery 1, and the contact area between the pole core 20 and the electrolyte on the outer side of the pole core 20 is increased, thereby better promoting the electrolytic reaction in the inner cavity 11 of the power battery 1, thereby better exerting the operating performance of the power battery 1.

[0046] For reference Figure 1In some embodiments, the liquid storage film 40 and the elastic sheet 30 are concentrically arranged, and the surface area of ​​the liquid storage film 40 is greater than or equal to 2 / 3 of the surface area of ​​the elastic sheet 30. The concentric arrangement of the liquid storage film 40 and the elastic sheet 30 can make the liquid storage film 40 leave the bottom of the inner cavity 11, so as to prevent the liquid storage film 40 from absorbing the electrolyte at the bottom of the inner cavity 11; the surface area of ​​the liquid storage film 40 is greater than or equal to 2 / 3 of the surface area of ​​the elastic sheet 30, that is, the liquid storage amount of the electrolyte in the inner cavity 11 can be guaranteed, and when the pole core 20 expands and squeezes the liquid storage film 40, the liquid storage film 40 can evenly touch the pole core 20, so that the electrolyte inside the liquid storage film 40 can also evenly adhere to the outer surface of the pole core 20, increasing the contact area between the electrolyte and the pole core 20, thereby facilitating the electrolytic reaction of the pole core 20.

[0047] Furthermore, in some embodiments, the height H3 of the liquid storage membrane 40 can be set to be greater than or equal to 2 / 3 of the height H2 of the elastic sheet 30, and the width of the liquid storage membrane 40 is the same as the width of the elastic sheet 30, thereby ensuring the contact area between the liquid storage membrane 40 and the elastic sheet 30 and the liquid storage capacity of the liquid storage membrane 40.

[0048] In some embodiments, the liquid storage film 40 is bonded to the elastic sheet 30 , so that the user can install the liquid storage film 40 on the surface of the elastic sheet 30 , which is convenient for the user to operate.

[0049] In some embodiments, the surface of the elastic sheet 30 is a planar structure, and the surface of the elastic sheet 30 is parallel to the connecting surface of the outer shell 10. Because the surface of the outer shell 10 is mostly planar, with this arrangement, the connecting area between the elastic sheet 30 and the outer shell 10 is larger, and a good connection relationship can be maintained between the two. Therefore, the elastic sheet 30 can be stably arranged in the inner cavity 11, thereby continuously providing a certain elastic constraint to the pole core 20.

[0050] In some embodiments, the elastic sheet 30 is a silicone sheet. Since silicone is stable, insulating, and not easily corroded, the elastic sheet 30 can maintain its own elasticity, thereby continuously exerting its elastic effect. That is, the elastic sheet 30 made of silicone has a longer service life, and the elastic sheet 30 made of silicone has little effect on the performance of the power battery 1.

[0051] For reference Figure 1 In some embodiments, in the thickness direction F1 of the pole core 20, an elastic sheet 30 is connected to the two opposite side walls of the inner cavity 11, and the two elastic sheets 30 are symmetrically distributed on both sides of the pole core 20, so that both sides of the pole core 20 can be elastically constrained by the elastic sheet 30, which is more conducive to the discharge of the gas inside the pole core 20 and enhances the safety performance of the power battery 1.

[0052] In this application, a device is also proposed, which can be referred to Figure 4The device includes a battery compartment 2a and the power battery 1 mentioned above, wherein the battery compartment 2a is opened in the device body 2, and the power battery 1 is installed in the battery compartment 2a. The power battery 1 can better ensure the operation effect of the device, wherein the specific structure of the power battery 1 refers to the above embodiments. Since the device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0053] It should be noted that, for the aforementioned method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the described order of actions, because according to the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0054] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0055] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A power battery, characterized in that: include: A housing having an inner cavity; A pole core, placed in the inner cavity; as well as An elastic sheet is arranged on the side wall of the inner cavity. In the thickness direction of the pole core, the elastic sheet is located between the pole core and the outer shell. When the pole core expands, the elastic sheet is squeezed by the pole core and undergoes elastic deformation. At the same time, the pole core is correspondingly squeezed by the elastic sheet to constrain the elastic deformation of the pole core during the charging and discharging process.

2. The power battery according to claim 1, characterized in that: When the pole core expands to the maximum extent, the pole core squeezes the elastic sheet, and in the thickness direction of the pole core, the minimum thickness of the elastic sheet is greater than or equal to the thickness of the elastic sheet when the maximum elastic deformation occurs.

3. The power battery according to claim 2, characterized in that: In the thickness direction of the pole core, the ratio of the distance between the pole core and the inner wall of the shell to the thickness change of the elastic sheet is greater than or equal to 0.94 and less than or equal to 1.

15.

4. The power battery according to claim 1, characterized in that: Along the height direction of the pole core, the size of the elastic sheet is larger than the height of the pole core; along the length direction of the pole core, the size of the elastic sheet is larger than the size of the pole core; and / or, along the height direction of the pole core, the ratio of the size of the elastic sheet to the size of the pole core is less than or equal to 1.05; And / or, along the length direction of the pole core, the ratio of the size of the elastic sheet to the size of the pole core is less than or equal to 1.

05.

5. The power battery according to any one of claims 1 to 4, characterized in that: A liquid storage cavity is formed on a surface of the elastic sheet facing the pole core.

6. The power battery according to claim 5, characterized in that: A liquid storage membrane is connected to the surface of the elastic sheet facing the pole core, and the liquid storage cavity is formed inside the membrane body of the liquid storage membrane, wherein the liquid storage membrane is a porous insulating membrane.

7. The power battery according to claim 6, characterized in that: One of the elastic sheets is correspondingly connected to one of the liquid storage membranes; And / or, the liquid storage membrane and the elastic sheet are arranged concentrically, and the surface area of ​​the liquid storage membrane is greater than or equal to 2 / 3 of the surface area of ​​the elastic sheet; And / or, the liquid storage film is bonded to the elastic sheet.

8. The power battery according to any one of claims 1 to 4, 6 to 7, characterized in that: The surface of the elastic sheet is a planar structure, and the surface of the elastic sheet and the connecting surface of the shell are parallel to each other; And / or, the elastic sheet is a silicone sheet.

9. The power battery according to claim 8, characterized in that: In the thickness direction of the pole core, two opposite side walls of the inner cavity are connected with an elastic sheet, and the two elastic sheets are symmetrically distributed on the two sides of the pole core.

10. A device, characterized in that: It comprises a battery compartment and the power battery according to any one of claims 1 to 9, wherein the power battery is installed in the battery compartment.

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