Battery and electric equipment

Abstract

The utility model relates to a battery and electric equipment, and the battery comprises a battery monomer which comprises a first side surface and a second side surface which are opposite to each other; the heat exchange piece is attached to the first side face; and the buffer piece is attached to the second side surface, and the buffer piece is configured to have elasticity so as to be compressed when the battery monomer is expanded. The heat exchange piece is attached to one side of the single battery for heat exchange of the single battery, the buffer piece is attached to the other side of the single battery for absorbing expansion of the single battery, the heat exchange piece is not needed for absorbing expansion of the single battery, it is guaranteed that the heat exchange piece does not deform and always makes contact with the single battery, and therefore it is guaranteed that the thermal resistance between the heat exchange piece and the single battery is not increased. According to the battery disclosed by the embodiment of the invention, the thermal management performance of the battery is ensured while the expansion of the battery monomers can be absorbed.

Description

Technical Field

[0001] The present disclosure relates to the field of battery technology, and in particular to a battery and an electrical device. Background Art

[0002] In related technologies, the expansion of the battery is absorbed by the heat exchange plate. After the battery expands during charging, the heat exchange plate is flattened. However, when the battery expands during discharge, the expansion decreases and the heat exchange plate may undergo plastic deformation, making it unable to fit the battery cell well. This will cause irregular air gaps between the battery cell and the heat exchange plate, resulting in increased thermal resistance between the two and affecting the heat transfer effect between the battery and the heat exchange plate. Utility Model Content

[0003] In order to overcome the problems existing in the related art, the present disclosure provides a battery and an electrical device.

[0004] According to a first aspect of an embodiment of the present disclosure, a battery is provided, comprising: a battery cell, comprising a first side surface and a second side surface opposite to each other; a heat exchange member, attached to the first side surface; and a buffer member, attached to the second side surface, wherein the buffer member is configured to be elastic so as to be compressed when the battery cell expands.

[0005] Optionally, the first side surface and the second side surface are configured as two large surfaces facing each other along the thickness direction of the battery cell.

[0006] Optionally, a support member is provided on a side of the buffer member facing away from the second side surface, and the support member is used to support the buffer member when the buffer member is compressed.

[0007] Optionally, the battery includes a plurality of battery cells, and the buffer member is attached between two adjacent battery cells, so that one of the two adjacent battery cells serves as the support member of the other.

[0008] Optionally, two sides of the buffer member are bonded to the second side surface and the support member respectively.

[0009] Optionally, the buffer is configured to have a shear strength of not less than 3 MPa and a tear resistance of not less than 3 MPa.

[0010] Optionally, the buffer is configured so that the compressive stress M2 is not greater than the expansion stress M1 of the battery cell.

[0011] Optionally, in a first direction, the elastic modulus W1 of the heat exchange element is greater than the elastic modulus W2 of the buffer element, and the first direction is perpendicular to the second side surface.

[0012] Optionally, a ratio of the capacity Q1 of the battery cell to a dimension L1 of the buffer along a first direction is configured as follows: 17.2 Ah / mm≤Q1 / L1≤547.3 Ah / mm, and the first direction is perpendicular to the second side surface.

[0013] Optionally, the buffer is made of a closed-cell micro-foam material or a semi-open-cell micro-foam material.

[0014] Optionally, the buffer member is made of an insulating material, and / or an insulating film is provided on the outer surface of the buffer member.

[0015] Optionally, the voltage resistance level of the buffer component is not less than 2700V.

[0016] Optionally, the thermal conductivity k1 of the buffer component is not greater than 0.1 W / m·K.

[0017] Optionally, the heat exchange element includes a cavity formed inside, the cavity is used to circulate a heat exchange medium, and the ratio of the capacity Q1 of the battery cell to the cross-sectional area S2 of the cavity is configured to be: 0.01Ah / mm 2 ≤Q1 / S2≤500Ah / mm 2 .

[0018] Optionally, the battery cell includes a shell and a winding core arranged in the shell, the shell includes the first side and the second side, wherein the ratio of the projected area S5 of the winding core on the first side to the area S1 of the first side is configured as: 0.5537≤S5 / S1≤0.9998, the ratio of the projected area S6 of the heat exchange element on the first side to the area S1 of the first side is configured as: 0.12≤S6 / S1≤1, and the ratio of the projected area S5 of the winding core on the first side to the projected area S6 of the heat exchange element on the first side is configured as: 0.5537≤S5 / S6≤8.3317.

[0019] According to a second aspect of an embodiment of the present disclosure, there is provided an electric device, comprising the battery provided by the present disclosure.

[0020] The technical solutions provided by the embodiments of the present disclosure can achieve the following beneficial effects: a heat exchange element is attached to one side of a battery cell to exchange heat with the battery cell, while a buffer element is attached to the other side to absorb the expansion of the battery cell. This eliminates the need for the heat exchange element to absorb the expansion of the battery cell. This ensures that the heat exchange element does not deform and remains in contact with the battery cell, thereby ensuring that the thermal resistance between the two does not increase. The battery of the embodiments of the present disclosure can absorb the expansion of the battery cell while maintaining the battery's thermal management performance.

[0021] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0023] Figure 1 is an exploded view of a battery according to an exemplary embodiment.

[0024] Figure 2 The figure is an exploded view of a battery cell, a heat exchange element, and a buffer element according to an exemplary embodiment.

[0025] Figure 3 The figure shows an assembly diagram of a battery cell, a heat exchange element, and a buffer element according to an exemplary embodiment.

[0026] Figure 4 FIG. 1 is an end-side perspective diagram of an assembly diagram of a battery cell and a buffer member according to an exemplary embodiment.

[0027] Figure 5 FIG. 1 is a diagram showing an assembly of a battery cell, a buffer component, and a heat exchange component from an installation surface perspective according to an exemplary embodiment.

[0028] Description of Reference Numerals

[0029] 100 - battery, 10 - battery cell, 101 - second side, 102 - first side, 11 - housing, 12 - winding core, 20 - heat exchange element, 21 - cavity, 30 - buffer element, 31 - adhesive portion, 32 - insulating film, 40 - support element. DETAILED DESCRIPTION

[0030] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

[0031] The embodiments described in the following examples of the present disclosure do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0032] According to the first aspect of the embodiment of the present disclosure, referring to Figure 1, provides a battery 100, which includes a battery cell 10 and a heat exchanger 20. The number of battery cells 10 can be multiple, and can be arranged along Figure 1 The heat exchanger 20 may include a liquid cooling plate, in which a cooling liquid may flow, or the heat exchanger may be a direct cooling plate, in which a refrigerant may flow. The present disclosure does not limit the specific structure of the heat exchanger 20. Figure 2 The battery cell 10 includes a first side surface 102 and a second side surface 101 that are opposite each other. The heat exchange element 20 can be attached to the first side surface 102, and the buffer element 30 can be attached to the second side surface 101. The buffer element 30 is configured to be elastic so that it can be compressed when the battery cell 10 expands. It is understood that due to its elasticity, the buffer element 30 can also elastically return to its original position when the expansion of the battery cell 10 decreases.

[0033] Through the above technical solution, a heat exchanger 20 is attached to one side of the battery cell 10 to exchange heat with the battery cell 10, while a buffer 30 is attached to the other side to absorb the expansion of the battery cell 10. This eliminates the need for the heat exchanger 20 to absorb the expansion of the battery cell 10. This ensures that the heat exchanger 20 does not deform and remains in contact with the battery cell 10, thereby ensuring that the thermal resistance between the two does not increase. The battery of the disclosed embodiment can absorb the expansion of the battery cell 10 while maintaining the thermal management performance of the battery 100.

[0034] Reference Figure 2 The first side surface 102 and the second side surface 101 can be configured as two large, opposing surfaces along the thickness direction of the battery cell 10. The large surface has the largest surface area of the battery cell 10 and is also the primary location where the battery cell 10 expands. Placing the buffer 30 on the large surface can better absorb this expansion. Furthermore, since the large surface has a large heat dissipation area, placing the heat exchange element 20 on the large surface can improve the heat exchange efficiency of the battery 100.

[0035] In the disclosed embodiment, a support member 40 is provided on the side of the buffer member 30 facing away from the second side surface 101 . The support member 40 is used to support the buffer member 30 when it is compressed, so as to prevent the buffer member 30 from rebounding and contacting the battery cell 10 after being compressed.

[0036] In one embodiment, the battery 100 includes a plurality of battery cells 10. Figure 3 The buffer member 30 can be attached between two adjacent battery cells 10, so that one of the two adjacent battery cells 10 serves as the support member 40 for the other. In this way, two adjacent battery cells 10 can share a buffer member 30 and a heat exchange member 20, thereby saving space and improving space utilization. In other embodiments, the support member 40 may also include a separate rigid support plate structure, which is not limited in this disclosure.

[0037] To ensure that the entire battery pack system withstands various mechanical conditions, such as random vibration and impact, without structural failure, and to ensure that the first-order modal frequency of the battery pack system is no less than 55 Hz, the battery 100 must have a certain level of structural strength. Specifically, the buffer 30 itself must have a certain level of strength, and the connections between the buffer 30 and other components must have a certain level of strength. In the disclosed embodiments, this strength can be achieved through a combination of one or more of the following methods.

[0038] For example, the buffer member 30 can be bonded to the second side surface 101 and the support member 40, respectively. This bonding ensures a certain degree of connection strength between the buffer member 30, the battery cell 10, and the support member 40. Furthermore, this bonding method ensures that there are no gaps between the three, ensuring that the buffer member 30 maintains contact with the battery cell 10, effectively absorbing expansion of the battery cell 10.

[0039] There are many ways to achieve bonding. In one embodiment, the buffer 30 can be made of a sticky material, such as a silicon-based material. The silicon-based material itself has stickiness, thereby achieving bonding with the battery cell 10 and the support member 40. Alternatively, in another embodiment, the buffer 30 itself does not have stickiness, such as being made of a polyurethane material. The sides of the buffer 30 that are used to contact the battery cell 10 and the support member 40 are provided with sticky portions 31, combined with Figure 4 The adhesive portion 31 can be made of a material similar to double-sided tape or any other adhesive material, which will not be described in detail here.

[0040] By designing the material and structure of the buffer 30, the buffer 30 can be configured to have a shear strength of no less than 3 MPa, ensuring that the buffer 30 is not easily damaged or ineffective. Furthermore, the adhesive strength of the buffer 30 can be used to ensure that the buffer 30 has a tear resistance of no less than 3 MPa relative to the battery cell 10, ensuring that the buffer 30 is not easily torn from the battery cell 10 and maintaining a strong connection.

[0041] The area of the second side surface 101 is S1. The expansion force that causes the maximum displacement of the battery cell 10 can be measured through testing to be F1. The expansion stress of the battery cell 10 is M1 = F1 / S1. When the battery cell 10 experiences maximum expansion displacement, the measured compressive stress of the buffer 30 is M2. In the disclosed embodiment, the buffer 30 can be configured such that the compressive stress M1 is not less than the expansion stress M2 of the battery cell 10. This ensures that the expansion of the battery cell 10 compresses the buffer 30, thereby achieving its function of fully absorbing the expansion of the battery cell 10.

[0042] To ensure that when the battery cell 10 expands, the buffer member 30 deforms while minimizing deformation of the heat exchange member 20, thereby ensuring the reliability of the heat exchange member 20 and thus the performance of the battery 100, in the disclosed embodiment, the elastic modulus W1 of the heat exchange member 20 is greater than the elastic modulus W2 of the buffer member 30 in the first direction. The first direction is perpendicular to the second side surface 101, that is, when the second side surface 101 is the larger surface, the first direction is the thickness direction.

[0043] In one embodiment, the dimension of the buffer 30 along the first direction is L1, the capacity of the battery cell 10 is Q1, and 17.2 Ah / mm ≤ Q1 / L1 ≤ 547.3 Ah / mm. The first direction is perpendicular to the second side surface 101; that is, when the second side surface 101 is the larger surface, the first direction is the thickness direction. It is understood that a larger dimension L1 of the buffer 30 along the first direction increases its ability to absorb expansion, but also increases the space occupied by the buffer 30, affecting the energy density of the entire battery pack. Therefore, within this ratio range, the buffer 30 can meet its expansion absorption requirements without causing redundant material and occupying a large space.

[0044] After a large number of experimental verifications, if the ratio of the two is greater than 547.3Ah / mm, the size L1 of the buffer 30 is too thin for the current battery cell 10, the effect of absorbing expansion is poor, and it may cause the heat exchanger 20 to deform; if the ratio of the two is less than 17.2Ah / mm, the size L1 of the buffer 30 is too thick for the current battery cell 10, resulting in redundant material waste.

[0045] In the disclosed embodiment, the buffer member 30 may be made of a closed-cell micro-foam material or a semi-open-cell micro-foam material. This material has good elasticity and is easily compressed, thereby effectively absorbing the expansion of the battery cell 10 .

[0046] In one embodiment, the buffer member 30 is made of an insulating material to prevent the buffer member 30 from being conductive and affecting the safety of the battery 100 .

[0047] When the buffer 30 has a conductive function that affects safety performance, such as when there is a conductive material inside the buffer 30, in this case, in order to ensure the insulation of the buffer 30, an insulating film 32 can be provided on the outer surface of the buffer 30. The insulating film 32 can be formed on the surface of the buffer 30 by spraying, bonding or other connection methods. Specifically, the insulating film 32 can be a polyimide film, which has good insulation performance. Figure 4 When the buffer member 30 has the above-mentioned adhesive portion 31, the insulating film 32 can be arranged on the inner side of the adhesive portion 31, so that the adhesive portion 31 is bonded on the outside, and the insulating film 32 can cover it in all directions to ensure effective insulation.

[0048] In the embodiment of the present disclosure, the withstand voltage level of the buffer component 30 is not less than 2700V to ensure the safety performance of the battery 100.

[0049] The thermal conductivity k1 of the buffer member 30 may be set to be no greater than 0.1 W / m·K, so that the buffer member 30 has poor thermal conductivity, thereby allowing the heat of the battery cell 10 to dissipate from the heat exchange member 20 on the first side 102 .

[0050] To ensure the thermal management performance of the battery 100, the heat exchange element 20 needs to have a good heat exchange effect on the battery cells 10. Therefore, the heat exchange element 20 can be designed from multiple angles to improve its heat exchange performance. For details, please refer to one or more of the following methods.

[0051] The heat exchange element 20 may include a cavity 21 formed therein, which is used to circulate a heat exchange medium. To ensure that the cavity 21 can meet the heat exchange effect of the battery cell 10, the cavity 21 can be designed according to the capacity of the battery cell 10. For example, in the embodiment of the present disclosure, the ratio of the capacity Q1 of the battery cell 10 to the cross-sectional area S2 of the cavity 21 satisfies: 0.01Ah / mm 2 ≤Q1 / S2≤500Ah / mm 2 After a lot of experimental verification, when the ratio is less than 0.01Ah / mm 2 When the cross-sectional area of the cavity 21 is too large for the capacity of the current battery cell 10, the cavity 21 is redundantly designed, so that the utilization rate of the heat exchange element 20 is not maximized; when the ratio is greater than 500Ah / mm 2 When the cross-sectional area of the cavity 21 is too small for the current battery cell 10 , a good heat exchange effect cannot be achieved, which affects the thermal management performance of the battery 100 .

[0052] The heat exchanger 20 may be provided with spacer ribs to separate multiple cavities, thereby increasing the heat exchange area and facilitating the control of the flow characteristics of the fluid to form a good flow field distribution. In addition, the spacer ribs can have a good supporting effect and are not easily compressed, so that the heat exchanger 20 will not be compressed or deformed even if it is subjected to force. Among them, the cross-sectional area S3 of the heat exchanger 20 that is coplanar with the cross-sectional area of the cavity 21 can meet the following requirements: 75%≤S2 / S3≤98%. After a large number of experimental verifications, when the ratio is less than 75%, the proportion of the cavity 21 in the heat exchanger 20 is too small, and the heat exchange effect is poor; when the ratio is greater than 98%, the proportion of the cavity 21 in the heat exchanger 20 is too large, resulting in the heat exchanger 20 being thinner, the overall strength being too poor, and being prone to deformation.

[0053] Chamfers are formed around the perimeter of cavity 21 to reduce fluid flow resistance. The chamfers are set to be no less than 0.1 mm and no greater than 5 mm. Extensive experiments have shown that when the chamfer is less than 0.1 mm, the transition is not smooth enough, resulting in poor resistance reduction. When the chamfer is greater than 5 mm, the chamfer occupies too much space, resulting in a smaller cross-sectional area of cavity 21 and insufficient heat exchange.

[0054] Reference Figure 5 The battery cell 10 may include a housing 11 and a winding core 12 disposed within the housing 11, wherein the winding core 12 is a component formed by stacking a positive electrode sheet, a separator, and a negative electrode sheet in sequence, which may be stacked or wound. The housing 11 includes a first side surface 101 and a second side surface 102, such as the large side described above. It should be noted that Figure 5 The illustrations are for the purpose of clearly distinguishing the components, and their size ratios do not represent the size ratios of the actual products.

[0055] The ratio of the projected area S5 of the core 12 on the first side 102 to the area S1 of the first side 102 satisfies the following: 0.5537 ≤ S5 / S1 ≤ 0.9998. Extensive experiments have shown that when S5 / S1 is less than 0.5537, the heat exchange area of the core 12 cannot meet the heat exchange requirements. When S5 / S1 is greater than 0.9998, the shell 11 is too thin for the current core 12 and cannot meet the strength requirements.

[0056] The ratio of the projected area S6 of the heat exchange element 20 on the first side surface 102 to the area S1 of the first side surface 102 satisfies the following: 0.12 ≤ S6 / S1 ≤ 1. Extensive experiments have shown that when S6 / S1 is less than 0.12, the area of the heat exchange element 20 is insufficient to ensure effective heat exchange for the current battery cell 10. When S6 / S1 is greater than 1, the area of the heat exchange element 20 is larger than the area of the first side surface 102 of the battery cell 10, resulting in a redundant design of the heat exchange element 20, which wastes material and takes up excess space.

[0057] The ratio of the projected area S5 of the core 12 on the first side 102 to the projected area S6 of the heat exchange element 20 on the first side 102 satisfies the following: 0.5537 ≤ S5 / S6 ≤ 8.3317. Extensive experiments have shown that when S5 / S6 is less than 0.5537, the area of the heat exchange element 20 is too large for the current core 12, resulting in a redundant design of the heat exchange element 20, wasting material and occupying excess space. When S5 / S6 is greater than 8.3317, the area of the heat exchange element 20 is too small for the current core 12, making it difficult for the heat exchange element 20 to meet the heat dissipation requirements of the core 12.

[0058] According to a second aspect of the present invention, an electric device is provided, including the battery 100 described above, and having all the beneficial effects of the battery 100 described above, which will not be described in detail here. The electric device may include a vehicle, a drone, etc.

[0059] In the foregoing detailed description, reference is made to the accompanying drawings, which illustrate, by way of illustration, specific aspects of the present disclosure in which it may be practiced. In this regard, terms indicating directions or expressing positional relationships, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc., may be used with reference to the orientation of the figures being described. Since the components of the described devices may be positioned in a plurality of different orientations, the directional terms may be used for illustrative purposes rather than restrictive. It should be understood that other aspects may be utilized and structural or logical changes may be made without departing from the concepts of the present disclosure. Therefore, the following detailed description should not be taken in a limiting sense.

[0060] It should be understood that, unless otherwise specifically noted, the features of the various embodiments of the present disclosure described herein may be combined with each other. As used herein, the term "and / or" includes any one of the relevant listed items and any combination of any two or more thereof; similarly, "at least one of" includes any one of the relevant listed items and any combination of any two or more thereof.

[0061] It should be understood that, unless otherwise expressly specified or limited, the terms "join," "attach," "install," "connect," "connect," "fix," etc. used in the embodiments of the present disclosure should be understood in a broad sense. For example, they can be fixedly connected, detachably connected, or integrated; they can be mechanically connected, electrically connected, or communicable with each other; they can be directly connected, or indirectly connected through an intermediate medium, and they can be internally connected between two elements or an interactive relationship between two elements, unless otherwise expressly limited. For those skilled in the art, the specific meanings of the above terms in this article can be understood according to specific circumstances.

[0062] Additionally, the term "over" as used in reference to a component, element, or material layer being formed "over" or located "over" a surface may be used herein to mean that the component, element, or material layer is "indirectly" positioned (e.g., placed, formed, deposited, etc.) on the surface such that one or more additional components, elements, or layers are disposed between the surface and the component, element, or material layer. However, the term "over" as used in reference to a component, element, or material layer being formed "over" or located "over" a surface may alternatively have a specific meaning: the component, element, or material layer is "directly" positioned (e.g., placed, formed, deposited, etc.) on the surface, e.g., in direct contact with the surface.

[0063] Although terms such as "first", "second" and "third" may be used herein to describe various components, parts, regions, layers or sections, these components, parts, regions, layers or sections are not limited to these terms. On the contrary, these terms are only used to distinguish one component, part, region, layer or section from another component, part, region, layer or section. Therefore, without departing from the teachings of each example, the first component, part, region, layer or section mentioned in the examples described herein may also be referred to as the second component, part, region, layer or section. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" can explicitly or implicitly include at least one such feature. In the description herein, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0064] It should be understood that spatially relative terms, such as "above," "upper," "below," and "lower," are used herein to describe the relationship of one element to another element shown in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, an element described as being "above" or "upper" relative to another element would then be "below" or "lower" relative to the other element. Thus, the term "above" encompasses both above and below orientations, depending on the spatial orientation of the device. The device may be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatially relative terms used herein should be interpreted accordingly.

[0065] Furthermore, the word "exemplary" is used herein to mean serving as an example, instance, or illustration. Any aspect or design described herein as "exemplary" is not necessarily to be construed as advantageous over other aspects or designs. Rather, the use of the word exemplary is intended to present concepts in a concrete manner. As used herein, the term "or" is intended to mean an inclusive "or" rather than an exclusive "or." That is, unless otherwise specified or clear from the context, "X applies to A or B" is intended to mean any of the natural inclusive permutations. That is, if X applies to A; X applies to B; or X applies to both A and B, then "X applies to A or B" satisfies any of the aforementioned instances. Furthermore, the articles "a" and "an," as used in this application and the appended claims, are generally understood to mean "one or more," unless otherwise specified or clear from the context to refer to the singular form.

[0066] Likewise, although the present disclosure has been shown and described with respect to one or more implementations, equivalent variations and modifications will occur to those skilled in the art upon reading and understanding this specification and the accompanying drawings. The present disclosure includes all such modifications and variations and is limited only by the scope of the claims. With particular regard to the various functions performed by the components described above (e.g., elements, resources, etc.), unless otherwise indicated, terms used to describe such components are intended to correspond to any component (functionally equivalent) that performs the specific function of the described component, even if not structurally equivalent to the disclosed structure. In addition, although particular features of the present disclosure may have been disclosed with respect to only one of several implementations, such features may be combined with one or more other features of other implementations as may be desired and advantageous for any given or particular application. Furthermore, to the extent that the terms "include," "have," "have," "have," or variations thereof are used in the detailed description or claims, such terms are intended to be inclusive in a manner similar to the term "comprising."

[0067] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the present disclosure being indicated by the appended claims.

[0068] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A battery, characterized in that: include: A battery cell comprising a first side surface and a second side surface facing each other; a heat exchange element, attached to the first side surface; as well as A buffer member is attached to the second side surface, wherein the buffer member is configured to be elastic so as to be compressed when the battery cell expands, and a support member is provided on the side of the buffer member facing away from the second side surface, and the support member is used to support the buffer member when the buffer member is compressed.

2. The battery according to claim 1, characterized in that The first side surface and the second side surface are configured as two large surfaces facing each other along a thickness direction of the battery cell.

3. The battery according to claim 1, characterized in that The battery includes a plurality of battery cells, and the buffer member is attached between two adjacent battery cells so that one of the two adjacent battery cells serves as the support member of the other.

4. The battery according to claim 1, characterized in that Both sides of the buffer member are bonded to the second side surface and the support member respectively.

5. The battery according to claim 4, characterized in that The buffer member is configured to have a shear strength of not less than 3 MPa and a tear resistance of not less than 3 MPa.

6. The battery according to claim 1, characterized in that The buffer member is configured such that the compressive stress M2 is no greater than the expansion stress M1 of the battery cell.

7. The battery according to claim 1, characterized in that In a first direction, an elastic modulus W1 of the heat exchange element is greater than an elastic modulus W2 of the buffer element, and the first direction is perpendicular to the second side surface.

8. The battery according to claim 1, characterized in that A ratio of the capacity Q1 of the battery cell to a dimension L1 of the buffer member along a first direction is configured as follows: 17.2 Ah / mm≤Q1 / L1≤547.3 Ah / mm, and the first direction is perpendicular to the second side surface.

9. The battery according to claim 1, characterized in that The buffer is made of a closed-cell micro-foam material or a semi-open-cell micro-foam material.

10. The battery according to claim 1, characterized in that The buffer is made of an insulating material, and / or an insulating film is provided on the outer surface of the buffer.

11. The battery according to claim 10, characterized in that The withstand voltage level of the buffer component is not less than 2700V.

12. The battery according to claim 1, characterized in that The thermal conductivity k1 of the buffer member is not greater than 0.1 W / m·K.

13. The battery according to claim 1, characterized in that The heat exchange element includes a cavity formed inside, and the cavity is used to circulate the heat exchange medium. The ratio of the capacity Q1 of the battery cell to the cross-sectional area S2 of the cavity is configured to be: 0.01Ah / mm 2 ≤Q1 / S2≤500Ah / mm 2 .

14. The battery according to claim 1, characterized in that The battery cell includes a shell and a winding core arranged in the shell, the shell includes a first side surface and a second side surface, wherein a ratio of a projected area S5 of the winding core on the first side surface to an area S1 of the first side surface is configured as follows: 0.5537≤S5 / S1≤0.9998, a ratio of a projected area S6 of the heat exchange element on the first side surface to an area S1 of the first side surface is configured as follows: 0.12≤S6 / S1≤1, and a ratio of a projected area S5 of the winding core on the first side surface to a projected area S6 of the heat exchange element on the first side surface is configured as follows: 0.5537≤S5 / S6≤8.3317.

15. An electrical device, characterized in that: Comprising a battery according to any one of claims 1-14.

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