Battery, energy storage battery system and electric equipment

Abstract

The invention provides a battery, an energy storage battery system and electric equipment, and relates to the technical field of batteries. The battery includes a battery cell and a cushion pad. The at least two battery monomers comprise a first battery monomer and a second battery monomer, and the internal energy of the gas in the second battery monomer is greater than that of the gas in the first battery monomer under the condition of a preset number of cycles; the cushion pad is arranged on one side of the battery monomer and is supported by the battery monomer; the at least two cushion pads comprise a first cushion pad corresponding to the first battery monomer and a second cushion pad corresponding to the second battery monomer, and the elastic potential energy of the second cushion pad is greater than that of the first cushion pad in the arrangement direction of the battery monomers and the corresponding cushion pads under the condition of compression limit; the elastic potential energy of the second buffer cushion is greater than that of the first buffer cushion under the condition of preset times of circulation. The battery provided by the invention can give consideration to both cost and safety. The battery provided by the invention is used for supplying power.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery, an energy storage battery system, and an electrical device. Background Technology

[0002] In the process of assembling multiple battery cells into batteries, such as battery modules or battery packs, it is necessary to ensure that the battery cells are in contact with cushioning pads to achieve a relatively safe and reliable installation. However, using cushioning pads with strong cushioning performance increases costs, and these pads are generally larger, leading to lower energy density and further increasing the cost of the battery and its application. On the other hand, using cushioning pads with weak cushioning performance can affect battery safety. Therefore, it is difficult to balance cost and safety in related technologies. Summary of the Invention

[0003] This application provides a battery, an energy storage battery system, and an electrical device that can balance cost and safety.

[0004] In a first aspect, this application provides a battery comprising battery cells and buffer pads. The number of battery cells is at least two, including a first battery cell and a second battery cell. After a predetermined number of cycles, the internal energy of the gas in the second battery cell is greater than that of the gas in the first battery cell. A buffer pad is disposed on one side of the battery cell and supports the battery cell. The number of buffer pads is at least two, including a first buffer pad corresponding to the first battery cell and a second buffer pad corresponding to the second battery cell. Along the arrangement direction of the battery cells and their corresponding buffer pads, under compression limit conditions, the elastic potential energy of the second buffer pad is greater than that of the first buffer pad, so that after a predetermined number of cycles, the elastic potential energy of the second buffer pad is greater than that of the first buffer pad.

[0005] By aligning the battery cells and corresponding buffer pads along their arrangement direction at the compression limit, the elastic potential energy of the second buffer pad is greater than that of the first buffer pad. This means the second buffer pad has higher buffering performance than the first, which benefits battery cells with stronger expansion capabilities, providing ample buffer space during expansion. This reduces the stress on the second battery cell and improves battery safety. Furthermore, the higher buffering performance of the second buffer pad means that even battery cells with weaker expansion capabilities, supported by a slightly less effective buffer pad, do not suffer from excessive buffering redundancy. This allows for better buffering during the expansion of the first battery cell while reducing the size and stiffness of the first buffer pad, thereby improving energy density. Therefore, the battery provided in this application balances cost and safety.

[0006] In some implementations of this application, along the arrangement direction of the battery cell and the corresponding buffer pad, the length of the second buffer pad is greater than or equal to that of the first buffer pad, so that the elastic potential energy of the second buffer pad is greater than that of the first buffer pad when under compression limit.

[0007] By making the length of the second buffer pad greater than or equal to that of the first buffer pad, the second battery cell can expand to a larger size, thereby reducing the force exerted by the first buffer pad on the second battery cell and improving its reliability. Furthermore, making the length of the second buffer pad equal to that of the first buffer pad facilitates the arrangement of the battery cell and the buffer pad, thus simplifying battery manufacturing.

[0008] In some implementations of this application, along the arrangement direction of the battery cell and the corresponding buffer pad, the length of the second buffer pad is greater than that of the first buffer pad, and the stiffness of the second buffer pad is the same as that of the first buffer pad.

[0009] By making the stiffness of the second buffer pad the same as that of the first buffer pad, it is easier to process and manufacture multiple buffer pads, and it is also easier to accurately control the force between multiple battery cells and their corresponding buffer pads, which helps to improve the safety of the battery cells.

[0010] In some implementations of this application, the material used to make the second buffer pad includes at least one of the following: aerogel, silicone foam, silicone pad, silicone sponge, glass wool, mica board, and silicone rubber, so that the stiffness of the second buffer pad is greater than that of the first buffer pad.

[0011] By making the second cushioning pad from the aforementioned materials, it is advantageous to achieve better cushioning performance and lower cost.

[0012] In some implementations of this application, at least two battery cells are arrayed along a first direction, and a buffer pad is supported between two adjacent battery cells along the first direction; and / or, the buffer pad is supported between the battery cells and the inner wall of the battery casing.

[0013] By supporting the buffer pad between two adjacent battery cells along a first direction, the buffer pad reduces the possibility of direct contact between the two adjacent battery cells, thereby reducing the compressive force generated by the mutual compression of the two adjacent battery cells during expansion. The buffer pad is also supported between the battery cell and the inner wall of the battery casing, further reducing the possibility of direct contact between the battery cell and the inner wall of the casing, thus reducing the compressive force generated by the compression of the casing wall by the adjacent battery cells during expansion.

[0014] In some implementations of this application, the second buffer pad is located closer to the center of the battery's internal cavity than the first buffer pad.

[0015] The heat generation in the middle of the internal cavity of the battery box is generally higher, and the battery cells in the middle of the internal cavity of the battery box generally expand more. By placing the second buffer pad closer to the middle of the internal cavity of the battery box relative to the first buffer pad, it is beneficial to provide sufficient buffering for the battery cells with strong expansion capacity during the expansion process.

[0016] In some implementations of this application, the first battery cell and the second battery cell are arrayed along a first direction, and along the first direction, the second buffer pad is located closer to the center of the inner cavity of the housing than the first buffer pad.

[0017] By positioning the second buffer pad closer to the center of the inner cavity of the housing relative to the first buffer pad along the first direction, it is beneficial to ensure that the battery cells with strong expansion capacity receive sufficient buffering during the expansion process.

[0018] In some implementations of this application, the first direction is the width direction of the battery cell.

[0019] By positioning the second buffer pad closer to the center of the inner cavity of the battery cell relative to the first buffer pad along the width direction of the battery cell, it is beneficial to ensure that the battery cell with strong expansion capacity receives sufficient buffering during the expansion process.

[0020] Secondly, this application provides an energy storage battery system, which includes the battery provided in the first aspect of this application. The number of batteries is at least two, and the at least two batteries are connected in series, in parallel, or in a mixed connection.

[0021] The energy storage battery system provided in this application includes the battery provided in the first aspect of this application, and therefore can achieve the same effect, namely, balancing cost and safety.

[0022] Thirdly, this application provides an electrical device, which includes an electrical body and a battery provided in the first aspect of this application. The battery is electrically connected to the electrical body to supply power to the electrical body.

[0023] The electrical equipment provided in this application includes the battery provided in the first aspect of this application, and therefore can achieve the same effect, namely, balancing cost and safety. Attached Figure Description

[0024] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0025] Figure 1 Exploded views of batteries in some embodiments of this application;

[0026] Figure 2This is one of the structural schematic diagrams of a battery without showing the cover plate and side plate in some embodiments of this application;

[0027] Figure 3 This is a second schematic diagram of the battery structure in some embodiments of this application, without showing the cover plate and side plate;

[0028] Figure 4 This is one of the structural schematic diagrams of the buffer pad in some embodiments of this application;

[0029] Figure 5 This is a second schematic diagram of the structure of the buffer pad in some embodiments of this application;

[0030] Figure 6 This is the third schematic diagram of the battery structure in some embodiments of this application, without showing the cover plate and side plate.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1-Battery cell; 2-First buffer pad; 3-Second buffer pad; 31-First buffer section; 32-Second buffer section; 4-Box body; a-First direction; b-First length; c-Second length. Detailed Implementation

[0033] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application.

[0035] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0036] In the description of the embodiments of this application, unless otherwise specified, the technical steps may be interchanged in a particular order or sequence so that the embodiments of this application described herein can be implemented in a sequence other than that illustrated or described herein.

[0037] In the description of the embodiments of this application, the technical terms "first," "second," "third," etc., are used only to distinguish objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In some embodiments of this application, "first," "second," "third," etc., may also refer to the same object. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0038] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0039] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0040] The following is a detailed description of this application.

[0041] In the process of assembling multiple battery cells into batteries, such as battery modules or battery packs, it is necessary to ensure that the battery cells are in contact with cushioning pads to achieve a relatively safe and reliable installation. However, using cushioning pads with strong cushioning performance increases costs, and these pads are generally larger, leading to lower energy density and further increasing the cost of the battery and its application. On the other hand, using cushioning pads with weak cushioning performance can affect battery safety. Therefore, it is difficult to balance cost and safety in related technologies.

[0042] This application provides a battery comprising battery cells and buffer pads. The battery cells are at least two in number, including a first battery cell and a second battery cell. After a predetermined number of cycles, the internal energy of the gas in the second battery cell is greater than that of the gas in the first battery cell. A buffer pad is disposed on one side of the battery cell and supports it. The buffer pads are at least two in number, including a first buffer pad corresponding to the first battery cell and a second buffer pad corresponding to the second battery cell. Along the arrangement direction of the battery cell and its corresponding buffer pad, under compression limit conditions, the elastic potential energy of the second buffer pad is greater than that of the first buffer pad, ensuring that after a predetermined number of cycles, the elastic potential energy of the second buffer pad is greater than that of the first buffer pad. By ensuring that the elastic potential energy of the second buffer pad is greater than that of the first buffer pad under compression limit conditions, the buffering performance of the second buffer pad is higher than that of the first buffer pad. This is beneficial for the battery cell with stronger expansion capacity, i.e., the second battery cell, to have sufficient buffer space during expansion, which helps reduce the stress on the second battery cell and improves battery safety. Furthermore, the second buffer pad has a higher buffering performance than the first buffer pad, meaning it supports the battery cell with weaker expansion capacity. This means the first battery cell is supported by the slightly less effective buffer pad, preventing excessive redundancy in the first buffer pad's buffering performance. While effectively ensuring buffering during the expansion of the first battery cell, the size and stiffness of the first buffer pad can be reduced, thereby improving energy density. Therefore, the battery provided in this application balances cost and safety.

[0043] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0044] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0045] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0046] Generally, there are at least two battery cells, which are distributed in an array and connected in series, parallel or mixed via a busbar.

[0047] In this embodiment, the battery can be a battery module or a battery pack, etc. The battery includes a housing, and at least two battery cells are arrayed inside the housing and connected in series, parallel, or mixed via a busbar component.

[0048] The battery provided in this application is applicable to electrical devices, which include a power-consuming body and a battery. The battery is electrically connected to the power-consuming body to supply power to it. For example, the power-consuming device can be a mobile phone, portable device, laptop, electric vehicle, electric toy, power tool, vehicle, ship, and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0049] The battery provided in this application is applicable to energy storage battery systems. This application provides an energy storage battery system including the battery provided in this application, wherein the number of batteries is at least two, and the at least two batteries are connected in series, parallel, or a combination thereof. Exemplarily, the energy storage battery system can be an energy storage container or an energy storage cabinet, etc.

[0050] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0051] Please refer to Figure 1 , Figure 2 and Figure 3 This application provides a battery, which includes a battery cell 1 and a buffer pad. The number of battery cells 1 is at least two, and each of the at least two battery cells 1 includes a first battery cell and a second battery cell. After a predetermined number of cycles, the internal energy of the gas in the second battery cell is greater than that of the gas in the first battery cell. The buffer pad is disposed on one side of the battery cell 1 and supports the battery cell 1. The number of buffer pads is at least two, and each of the at least two buffer pads includes a first buffer pad 2 corresponding to the first battery cell and a second buffer pad 3 corresponding to the second battery cell. Along the arrangement direction of the battery cell 1 and the corresponding buffer pad, under the compression limit, the elastic potential energy of the second buffer pad 3 is greater than that of the first buffer pad 2, so that after a predetermined number of cycles, the elastic potential energy of the second buffer pad 3 is greater than that of the first buffer pad 2.

[0052] In this embodiment of the application, the first battery cell and the second battery cell are different battery cells 1.

[0053] In this embodiment of the application, "after a preset number of cycles" means that both the first battery cell and the second battery cell have undergone a preset number of charge-discharge cycles, in which case the first battery cell and the second battery cell have the same number of cycles.

[0054] In this embodiment, the internal energy of the gas in the second battery cell is greater than that in the first battery cell. Specifically, the battery cell 1 includes a shell, which encloses a cavity, and an electrode assembly is disposed within the cavity. During use, the internal energy of the gas within the cavity tends to increase. This gas exerts a force on the inner wall of the cavity, and this force has a component along the thickness direction of the cavity sidewall, causing the shell of the battery cell 1 to expand. It is understood that in this embodiment, when both the first and second battery cells are in a free state, i.e., the shell is not in contact with the buffer pad and the shell can expand freely under the action of the gas inside the shell, after a preset number of cycles, the volume of expansion of the shell of the second battery cell is greater than that of the shell of the first battery cell.

[0055] In this embodiment, the buffer pad is disposed on one side of the battery cell 1, and can be on any side. For example, if the battery cell 1 is a prismatic battery, the buffer pad and the corresponding prismatic battery are arranged along the length, height, or width direction of the prismatic battery. In some embodiments of this application, the buffer pad and the corresponding prismatic battery are arranged along the width direction of the prismatic battery, and the cross-section of the buffer pad is a rectangular structure, which is perpendicular to the width direction of the corresponding prismatic battery. In this way, the buffer pad can provide a better cushioning effect. In some embodiments of this application, the length of the buffer pad along the height direction of the corresponding prismatic battery is the same as that of the corresponding prismatic battery. The length of the buffer pad along the length direction of the corresponding prismatic battery can be the same as or different from that of the corresponding prismatic battery. In this way, the buffer pad can provide a better cushioning effect. In some embodiments of this application, the length of the buffer pad along the length direction of the corresponding prismatic battery can be 30% to 120% of the length of the corresponding prismatic battery.

[0056] In this embodiment, the direction in which the buffer pad supports the battery cell 1 is also the direction in which the buffer pad and the battery cell 1 are arranged. For example, the direction in which the buffer pad and the battery cell 1 are arranged is the width direction of the battery cell 1, meaning the buffer pad and the battery cell 1 are positioned opposite each other along the width direction of the battery cell 1 and support each other. In this embodiment, the buffer pad and the battery cell 1 are in direct contact.

[0057] In this embodiment of the application, the buffer pad corresponding to the battery cell 1 is the buffer pad that supports the battery cell 1.

[0058] In this embodiment, at least two buffer pads include a first buffer pad 2 corresponding to the first battery cell and a second buffer pad 3 corresponding to the second battery cell. That is, the first buffer pad 2 and the second buffer pad 3 are different buffer pads. The first buffer pad 2 supports the first battery cell but does not support the second battery cell. The second buffer pad 3 supports the second battery cell but does not support the first battery cell.

[0059] In this embodiment, after a preset number of cycles, the elastic potential energy of the second buffer pad 3 is greater than that of the first buffer pad 2. Specifically, after a preset number of cycles, and with both the first and second battery cells in a free state, the volume of expansion of the shell of the second battery cell is greater than that of the shell of the first battery cell. Thus, after a preset number of cycles, with the second battery cell supported by the second buffer pad 3 and the first battery cell supported by the first buffer pad 2, the compression of the second buffer pad 3 by the second battery cell is greater than the compression of the first buffer pad 2 by the first battery cell. Furthermore, along the arrangement direction of the battery cell 1 and the corresponding buffer pad, at the compression limit, the elastic potential energy of the second buffer pad 3 is greater than that of the first buffer pad 2. That is, the second buffer pad 3 is more capable of withstanding compression than the first buffer pad 2. Therefore, after a preset number of cycles, the elastic potential energy of the second buffer pad 3 is greater than that of the first buffer pad 2. It should be noted that in this embodiment, the compression limit refers to the elastic compression limit.

[0060] In this embodiment, the compression of the second buffer pad 3 by the second battery cell is greater than the compression of the first buffer pad 2 by the first battery cell, which is due to the second battery cell being more prone to expansion than the first battery cell. During the expansion of the battery cell 1, a portion of the casing moves towards the corresponding buffer pad along the arrangement direction of the battery cell 1 and the corresponding buffer pad, thereby compressing the buffer pad. For the greater compression, exemplarily, in some embodiments of this application, along the arrangement direction of the battery cell 1 and the corresponding buffer pad, the length of the second buffer pad 3 is greater than that of the first buffer pad 2, and the stiffness of the second buffer pad 3 is the same as that of the first buffer pad 2. Here, greater compression means that the compression length of the second buffer pad 3 by the second battery cell is greater than the compression length of the first buffer pad 2 by the first battery cell. Of course, in some embodiments of this application, the stiffness of the second buffer pad 3 may also be different from that of the first buffer pad 2. In this case, the degree of compression is greater and should be understood by taking into account the stiffness factor. The internal energy of the gas in the battery cell 1 will be converted into the elastic potential energy of the buffer pad and the deformation energy of the shell. After a preset number of cycles, the second buffer pad 3 is subjected to a greater degree of compression, and the elastic potential energy accumulated by the second buffer pad 3 will be greater than that accumulated by the first buffer pad 2.

[0061] By aligning the battery cell 1 and its corresponding buffer pad in the direction of compression limit, the elastic potential energy of the second buffer pad 3 is greater than that of the first buffer pad 2. This means the buffering performance of the second buffer pad 3 is higher than that of the first buffer pad 2. This provides sufficient buffer space for the battery cell 1, which has a stronger expansion capacity, during expansion, reducing the stress on the second battery cell and improving battery safety. Using different heat-insulating pads ensures that the pressure on battery cells 1 at different locations within the battery is as consistent as possible. This helps maintain consistent electrochemical performance (such as the lithium plating window) of battery cells 1 at each location, reducing the risk of battery failure due to the failure of a single battery cell 1, thereby improving the battery's cycle performance. Furthermore, the higher buffering performance of the second buffer pad 3 compared to the first buffer pad 2 means that the weaker battery cell 1, supported by a buffer pad with slightly lower buffering performance, avoids excessive redundancy in the buffering performance of the first buffer pad 2. This allows for better buffering during the expansion of the first battery cell while reducing the size and stiffness of the first buffer pad 2, thus improving energy density. Therefore, the battery provided in this application balances cost and safety.

[0062] In some embodiments of this application, please refer to Figure 1 , Figure 2 and Figure 3 The buffer pad is made of heat-insulating material. In this way, the buffer pad can also play a heat insulation role. The battery cell 1 is prone to heat generation during use. Making the buffer pad with heat-insulating material helps to reduce the heat transfer of the battery cell 1 to other components of the battery, thereby improving the safety of the battery.

[0063] In some embodiments of this application, please refer to Figure 1 , Figure 2 and Figure 3 Along the arrangement direction of the battery cell 1 and the corresponding buffer pad, the length of the second buffer pad 3 is greater than or equal to that of the first buffer pad 2, so that the elastic potential energy of the second buffer pad 3 is greater than that of the first buffer pad 2 when under compression limit.

[0064] In this embodiment, the length of the first buffer pad 2 is shown in the first length b in the figure, and the length of the second buffer pad 3 is shown in the second length c in the figure. In some embodiments of this application, the first buffer pad 2 and the second buffer pad 3 can be columnar structures with equal cross-sections. The axial direction of the columnar structure is the arrangement direction of the battery cell 1 and the corresponding buffer pad. In this case, the length of the buffer pad is the axial length of the columnar structure.

[0065] Of course, in some embodiments of this application, please refer to Figure 4 , Figure 5 and Figure 6The first buffer pad 2 and the second buffer pad 3 may not be columnar structures with equal cross-sections. The length of the second buffer pad 3 is greater than that of the first buffer pad 2, referring to the length relationship of corresponding parts, so that after a preset number of cycles, the elastic potential energy of the second buffer pad 3 is greater than that of the first buffer pad 2. Exemplarily, in some embodiments of this application, the sidewall of the inner cavity of the outer casing includes a first wall portion and a second wall portion. After the battery cell 1 undergoes a preset number of cycles, the first wall portion is subjected to a greater force from the gas inside the inner cavity than the second wall portion. The buffer pad includes a first buffer portion 31 corresponding to the first wall portion and a second buffer portion 32 corresponding to the second wall portion. Along the thickness direction of the sidewall of the inner cavity, the length of the first buffer portion 31 is greater than that of the second buffer portion 32, so that under the condition of compression limit, the elastic potential energy of the second buffer portion 32 is less than that of the first buffer portion 31. Both the first buffer pad 2 and the second buffer pad 3 include a first buffer portion 31 and a second buffer portion 32. The length of the second buffer pad 3 is greater than that of the first buffer pad 2, which means that the length of the first buffer portion 31 of the second buffer pad 3 is greater than that of the first buffer portion 31 of the first buffer pad 2, and the length of the second buffer portion 32 of the second buffer pad 3 is greater than that of the second buffer portion 32 of the first buffer pad 2.

[0066] By making the length of the second buffer pad 3 greater than or equal to that of the first buffer pad 2, the second battery cell can expand to a larger size, thereby reducing the force exerted by the first buffer pad 2 on the second battery cell and improving its reliability. Furthermore, making the length of the second buffer pad 3 equal to that of the first buffer pad 2 facilitates the arrangement of the battery cell 1 and the buffer pad, simplifying battery manufacturing. It is understandable that during the expansion of the battery cell 1 and its compression of the buffer pad, the buffer pad also helps to suppress the expansion of the outer casing. For the same battery cell 1, the larger the expansion size of the battery cell 1, the smaller the suppressive effect of the buffer pad on the expansion of the battery cell 1, and the smaller the force exerted by the buffer pad on the outer casing, which is beneficial to the reliability of the battery cell 1. It is understandable that the length of the buffer pad should be determined based on the expansion capacity of the corresponding battery cell 1, on the one hand to reduce the risk of the buffer pad being crushed, and on the other hand to increase the energy density of the battery.

[0067] In some embodiments of this application, please refer to Figure 1 , Figure 2 and Figure 3 After a preset number of cycles, the length by which the second battery cell compresses the second buffer pad 3 is greater than the length by which the first battery cell compresses the first buffer pad 2. This helps to reduce the force exerted by the first buffer pad 2 on the second battery cell, thereby improving the reliability of the second battery cell.

[0068] In some embodiments of this application, please refer to Figure 1 , Figure 2and Figure 3 Along the arrangement direction of the battery cell 1 and the corresponding buffer pad, the length of the second buffer pad 3 is greater than that of the first buffer pad 2, and the stiffness of the second buffer pad 3 is the same as that of the first buffer pad 2.

[0069] By making the stiffness of the second buffer pad 3 the same as that of the first buffer pad 2, it is easier to process and manufacture multiple buffer pads, and it is also easier to accurately control the force between multiple battery cells 1 and their corresponding buffer pads, which helps to improve the safety of the battery cells 1.

[0070] In some embodiments of this application, please refer to Figure 1 , Figure 2 and Figure 3 The first cushioning pad 2 and the second cushioning pad 3 are made of the same material. This facilitates the processing and manufacturing of multiple cushioning pads.

[0071] In some embodiments of this application, please refer to Figure 1 , Figure 2 and Figure 3 The material used to make the second buffer pad 3 includes at least one of the following: aerogel, silicone foam, silicone pad, silicone sponge, glass wool, mica board, and silicone rubber, so that the stiffness of the second buffer pad 3 is greater than that of the first buffer pad 2.

[0072] By making the second cushioning pad 3 from the aforementioned material, it is advantageous to achieve a better cushioning effect and lower cost.

[0073] In some embodiments of this application, please refer to Figure 1 , Figure 2 and Figure 3 At least two battery cells 1 are arranged in an array along the first direction a, and a buffer pad is supported between two adjacent battery cells 1 along the first direction a; and / or, the buffer pad is supported between the battery cells 1 and the inner wall of the battery housing 4.

[0074] By supporting the buffer pad between two adjacent battery cells 1 along the first direction a, the buffer pad reduces the possibility of direct contact between the two adjacent battery cells 1, thereby reducing the compressive force generated by the mutual compression of the two adjacent battery cells 1 during expansion. The buffer pad is also supported between the battery cell 1 and the inner wall of the battery casing 4, further reducing the possibility of direct contact between the battery cell 1 and the inner wall of the casing 4, thus reducing the compressive force generated by the compression of the casing wall by the adjacent battery cells 1 during expansion. It is understandable that if a battery cell 1 is in direct contact with another battery cell 1 or the inner wall of the casing 4, the contact area between the battery cell 1 and the inner wall of the casing 4 is small, the pressure is high, and it is easy to damage the battery cell 1. However, when the battery cell 1 contacts the buffer pad, the buffer pad is more flexible and easily deformable, resulting in a larger contact area between the battery cell 1 and the buffer pad, and lower pressure, which is beneficial to the reliability of the battery cell 1.

[0075] In some embodiments of this application, please refer to Figure 1 , Figure 2 and Figure 3 After a preset number of cycles, the second battery cell is compressed to a greater length than the first battery cell. This helps to improve the stress distribution on the battery cell 1 supported by the second buffer pad 3.

[0076] In some embodiments of this application, please refer to Figure 1 , Figure 2 and Figure 3 The second buffer pad 3 is located in the middle of the inner cavity of the battery housing 4, relative to the first buffer pad 2.

[0077] The heat generation in the middle of the inner cavity of the housing 4 is generally high, and the battery cell 1 in the middle of the inner cavity of the housing 4 generally expands larger. By making the second buffer pad 3 closer to the middle of the inner cavity of the battery relative to the first buffer pad 2, it is beneficial to provide sufficient buffer for the battery cell 1 with strong expansion capacity during the expansion process.

[0078] In some embodiments of this application, please refer to Figure 1 , Figure 2 and Figure 3 The first battery cell and the second battery cell are arranged in an array along the first direction a. Along the first direction a, the second buffer pad 3 is located near the middle of the inner cavity of the housing 4 relative to the first buffer pad 2.

[0079] By positioning the second buffer pad 3 relative to the first buffer pad 2 closer to the center of the inner cavity of the housing 4 along the first direction a, it is beneficial for the battery cell 1 with strong expansion capacity to receive sufficient buffering during the expansion process.

[0080] In some embodiments of this application, please refer to Figure 1 , Figure 2 and Figure 3 The first direction a is the width direction of the battery cell 1.

[0081] By positioning the second buffer pad 3 closer to the center of the inner cavity of the housing 4 relative to the first buffer pad 2 along the width direction of the battery cell 1, it is beneficial to ensure that the battery cell 1 with strong expansion capacity receives sufficient buffering during the expansion process.

[0082] In some embodiments of this application, please refer to Figure 1 , Figure 2 and Figure 3 After a preset number of cycles, the internal energy of the gas in the second battery cell is greater than that in the first battery cell. The first and second battery cells are arranged in an array along a first direction a, where the first direction a is the width direction of the battery cell 1. At least two buffer pads include a first buffer pad 2 corresponding to the first battery cell and a second buffer pad 3 corresponding to the second battery cell. Along the first direction a, the second buffer pad 3 is closer to the center of the inner cavity of the housing 4 than the first buffer pad 2. The second buffer pad 3 is supported between two adjacent battery cells 1, and the first buffer pad 2 is supported between two adjacent battery cells 1, or between the battery cell 1 and the inner wall of the housing 4. Along the first direction a, the length of the second buffer pad 3 is greater than that of the first buffer pad 2, and the stiffness of the second buffer pad 3 is the same as that of the first buffer pad 2; or, along the first direction a, the length of the second buffer pad 3 is equal to that of the first buffer pad 2, and the stiffness of the second buffer pad 3 is greater than that of the first buffer pad 2, so that after the preset number of cycles, the elastic potential energy of the second buffer pad 3 is greater than that of the first buffer pad 2.

[0083] The above embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and all should be covered within the scope of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way.

Claims

1. A battery, characterized by, The battery cell includes: a plurality of battery cells, at least two of which include a first battery cell and a second battery cell, the internal energy of gas in the second battery cell being greater than that in the first battery cell after a preset number of cycles; a plurality of buffer pads arranged on one side of the battery cell and supporting the battery cell, at least two of which include a first buffer pad corresponding to the first battery cell and a second buffer pad corresponding to the second battery cell, the elastic potential energy of the second buffer pad being greater than that of the first buffer pad when the second buffer pad is at a compression limit along the arrangement direction of the battery cell and the corresponding buffer pad, so that the elastic potential energy of the second buffer pad is greater than that of the first buffer pad after the preset number of cycles.

2. The battery of claim 1, wherein, The length of the second buffer pad is greater than or equal to that of the first buffer pad along the arrangement direction of the battery cell and the corresponding buffer pad, so that the elastic potential energy of the second buffer pad is greater than that of the first buffer pad when the second buffer pad is at a compression limit.

3. The battery of claim 2, wherein, The length of the second buffer pad is greater than that of the first buffer pad along the arrangement direction of the battery cell and the corresponding buffer pad, and the stiffness of the second buffer pad is the same as that of the first buffer pad.

4. The battery of claim 2, wherein, The material of the second buffer pad includes at least one of aerogel, silica gel foam, silica gel pad, silica gel sponge, glass wool, mica plate, and silicone rubber, so that the stiffness of the second buffer pad is greater than that of the first buffer pad.

5. The battery according to any one of claims 1 to 4, characterized in that, The plurality of battery cells are arranged in a first direction, and the buffer pads are supported between adjacent battery cells along the first direction; and / or, the buffer pads are supported between the battery cells and the inner wall of the battery box.

6. The battery according to any one of claims 1 to 5, characterized in that, The second buffer pad is closer to the middle of the inner cavity of the battery box than the first buffer pad.

7. The battery of claim 6, wherein, The first battery cell and the second battery cell are arranged in a first direction, and the second buffer pad is closer to the middle of the inner cavity of the battery box than the first buffer pad along the first direction.

8. The battery of claim 7, wherein, The first direction is the width direction of the battery cell.

9. An energy storage battery system, characterized by, The battery includes: The battery of any one of claims 1-8, the number of which is at least two, at least two of which are connected in series, in parallel, or in a hybrid manner.

10. An electric device, characterized by The battery includes: a power-consuming body; The battery of any one of claims 1-8, the battery being electrically connected to the power-consuming body to supply power to the power-consuming body.

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