Battery module, battery pack and energy storage device

Abstract

The utility model relates to a battery module, a battery pack and an energy storage device, and the battery module comprises a battery pack which comprises a plurality of single batteries which are sequentially arranged along a first direction; the end plate assembly is arranged on the periphery of the battery pack in a surrounding manner and is used for fixing each battery monomer; the heating element is arranged at the bottom of the battery pack and is in contact with the bottom surfaces of all the battery monomers; and the supporting assembly is connected with the end plate assembly, is arranged on one side, deviating from the battery pack, of the heating piece, and is used for providing pressure for the heating piece to abut against each battery monomer. The heating piece is arranged between the battery pack and the supporting assembly, and the supporting assembly can provide pressure for the heating piece, so that the heating piece can be in good contact with the bottom surfaces of the battery monomers and better abut against the battery monomers, in this way, the heating effect of the heating piece on the battery monomers can be effectively improved, and the service life of the battery pack is prolonged. The use performance of the battery pack is improved.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a battery module, a battery pack, and an energy storage device. Background Art

[0002] With the development of new energy technologies, batteries are increasingly widely used in daily life and industry. The use of batteries has certain requirements for temperature. Within the optimal operating temperature range, the performance of the batteries is relatively good, while in a low-temperature environment, the performance of the batteries will decline or even become unusable. Therefore, it is usually necessary to provide a heating structure in the battery structure to heat the batteries in a low-temperature environment and improve the performance of the batteries.

[0003] However, the heating structures currently used have poor heating effects on the batteries and cannot effectively improve the performance of the batteries. Summary of the Utility Model

[0004] Based on this, it is necessary to provide a battery module, a battery pack, and an energy storage device to address the problem of poor heating effect of the batteries and the inability to effectively improve the performance of the batteries.

[0005] In a first aspect, this application provides a battery module, including:

[0006] A battery pack, including a plurality of battery cells, and each of the battery cells is arranged in sequence along a first direction;

[0007] An end plate assembly, surrounding the outer periphery of the battery pack and used for fixing each of the battery cells;

[0008] A heating element, disposed at the bottom of the battery pack and in contact with the bottom surfaces of all the battery cells; and

[0009] A support assembly, connected to the end plate assembly and disposed on a side of the heating element away from the battery pack, and the support assembly is used to provide a pressure pressing on each of the battery cells to the heating element.

[0010] In some embodiments, the support assembly includes a tray, and the tray is connected to the end plate assembly.

[0011] In some embodiments, the tray includes a main body portion and a connecting portion connected to each other. The connecting portion is disposed at opposite ends of the main body portion along the first direction and is detachably connected to the end plate assembly.

[0012] In some embodiments, the support assembly further includes an elastic member, and the elastic member is disposed between the tray and the heating element.

[0013] In some embodiments, the pallet includes a main body portion and a connecting portion connected to each other, and the connecting portion is disposed at opposite ends of the main body portion along the first direction;

[0014] Wherein, the elastic member is disposed on a surface of the main body portion facing the heating member.

[0015] In some embodiments, the elastic member is configured as a foam, and the foam is compressively disposed between the pallet and the heating member.

[0016] In some embodiments, the size of the heating member matches the area of the main body portion.

[0017] In some embodiments, the connecting portion protrudes from the main body portion toward the side close to the end plate assembly and is used to limit the heating member along the first direction.

[0018] In some embodiments, the connecting portions at opposite ends of the main body portion are symmetrically arranged about the center of the main body portion.

[0019] In some embodiments, the heating member includes a heating film, and the heating film is attached to the bottom surfaces of all the battery cells.

[0020] In some embodiments, the end plate assembly includes a fixed end plate and a limiting member. The fixed end plate is respectively disposed at opposite ends of the battery pack along the first direction, and the limiting member surrounds the outer periphery of the fixed end plate and the battery pack to limit all the battery cells between the fixed end plates.

[0021] In a second aspect, the present application further provides a battery pack, including at least two battery modules, at least one of the battery modules being the battery module as described above, and the battery modules are sequentially stacked along a second direction;

[0022] Wherein, the second direction intersects with the bottom surface of the battery cell.

[0023] In a third aspect, the present application further provides an energy storage device, including the battery pack as described above.

[0024] For the above-mentioned battery module, battery pack and energy storage device, first, the end plate assembly can fix a plurality of sequentially arranged battery cells to form a whole. Secondly, the heating member is disposed between the battery pack and the support assembly, and the support assembly can provide pressure to the heating member so that the heating member can be in good contact with the bottom surfaces of the battery cells, thereby better pressing on the battery cells. In this way, the heating effect of the heating member on each battery cell can be effectively improved, and the service performance of the battery pack can be improved. Description of the Drawings

[0025] Figure 1 Schematic diagram of the overall structure of a battery module according to one or more embodiments.

[0026] Figure 2 Exploded view of a battery module according to one or more embodiments.

[0027] Figure 3 Schematic diagram of the structure of a battery cell in a battery module according to one or more embodiments.

[0028] Figure 4 Schematic perspective view of a battery module according to one or more embodiments.

[0029] Figure 5 Schematic perspective view of a pallet in a battery module according to one or more embodiments.

[0030] Figure 6 It is Figure 1 Local enlarged view of position A in

[0031] Figure 7 Schematic side view of a pallet in a battery module according to one or more embodiments.

[0032] Figure 8 Schematic top view of a pallet in a battery module according to one or more embodiments.

[0033] Figure 9 Schematic diagram of the structure of a battery pack according to one or more embodiments.

[0034] Explanation of reference numerals: 100, battery pack; 10, battery module; 11, battery group; 12, end plate assembly; 13, heating element; 14, support assembly; 111, battery cell; 121, fixed end plate; 122, limiting member; 141, pallet; 142, elastic member; 1111, large surface; 1112, side surface; 1113, top surface; 1114, bottom surface; 1411, main body portion; 1412, connecting portion; a, first direction; b, second direction; X, thickness direction; Y, width direction; Z, height direction. Detailed implementation manners

[0035] To make the above objects, features, and advantages of the present application more obvious and understandable, the following will describe the detailed implementation manners of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0036] In the description of the present application, it should be understood that if there are terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present application.

[0037] In addition, if there are terms such as "first" and "second", these terms are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present application, if there is a term "plurality", the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0038] In the present application, unless otherwise clearly specified and limited, if there are terms such as "installation", "connection", "attachment", "fixation", etc., these terms should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0039] In the present application, unless otherwise clearly specified and limited, if there is a description such as a first feature being "above" or "below" a second feature, the meaning may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0040] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are only for illustrative purposes and do not represent the only implementation.

[0041] When the battery is in use, there are certain requirements for the temperature. Affected by the battery's own materials and structure, etc., there is usually an optimal operating temperature range. Within this temperature range, the battery's performance is relatively good. When exceeding this applicable range, for example, when the temperature is lower than this range, the low-temperature environment will cause the battery's performance to decline or even make the battery unable to be used.

[0042] Therefore, currently, heating structures such as heating films are usually provided on the sides of the battery, and heating structures are provided on both opposite sides. In this way, the overall structure of the battery is relatively complex.

[0043] Furthermore, the currently adopted heating structure is not closely attached to the battery, which will cause a gap between the heating structure and the battery, affecting the heating effect of the heating structure on the battery.

[0044] Based on the above considerations, in order to solve the problem that the current heating structure has a poor heating effect on the battery, in one or more embodiments of the present application, a battery module is provided. The heating element is disposed between the battery pack and the support assembly, and the support assembly provides pressure to the heating element, so that the heating element can be in good contact with the bottom surfaces of the battery cells, and thus better press against each battery cell. In this way, the heating effect of the heating element on each battery cell can be effectively improved, and the performance of the battery pack can be improved.

[0045] Referring to Figure 1 , an embodiment of the present application provides a battery module 10, including a battery pack 11, an end plate assembly 12, a heating element 13, and a support assembly 14. Among them, the battery pack 11 includes a plurality of battery cells 111, and the battery cells 111 are arranged in sequence along the first direction a. The end plate assembly 12 surrounds the outer periphery of the battery pack 11 and is used to fix the battery cells 111. The heating element 13 is disposed at the bottom of the battery pack 11 and is in contact with the bottom surfaces of all the battery cells 111. The support assembly 14 is connected to the end plate assembly 12 and is disposed on the side of the heating element 13 away from the battery pack 11. The support assembly 14 is used to provide pressure to the heating element 13 to press against each battery cell 111.

[0046] See Figure 2 , it should be noted that the battery cell 111 is the smallest unit that makes up the battery. AsFigure 3 As shown, each battery cell 111 has two large faces 1111 arranged opposite to each other, two side faces 1112, a top face 1113, and a bottom face 1114. Among them, the large face is the surface with the largest area on the battery cell 111. The two side faces, the top face, and the bottom face are respectively perpendicular to the large face and jointly enclose a rectangular structure.

[0047] Each battery cell 111 has a thickness direction X, a width direction Y, and a height direction Z. Among them, the thickness direction X of the battery cell 111 refers to the direction perpendicular to the large face, the width direction Y refers to the direction perpendicular to the side face, and the height direction Z refers to the direction perpendicular to the top face and the bottom face.

[0048] In this application, multiple battery cells 111 are arranged in sequence along the first direction a and form a battery pack 11. Among them, the first direction a can be set as the thickness direction X of the battery cell 111, that is, the large faces between multiple battery cells 111 are attached to each other, and they are arranged in sequence along their own thickness to form the battery pack 11.

[0049] Of course, the first direction a can also be set as the width direction or the height direction of the battery cell 111. The specific arrangement direction can be set according to actual usage requirements and will not be elaborated here.

[0050] The end plate assembly 12 refers to a component that can fix each battery cell 111 in the battery pack 11 to form an integral structure. The end plate assembly 12 surrounds the outer periphery of the battery pack 11 to fix all the battery cells 111 and prevent relative movement between the battery cells 111, making it an integral structure.

[0051] Furthermore, the heating element 13 is arranged at the bottom of the battery pack 11, that is, the heating element 13 is located at the bottom face of all the battery cells 111 and forms a surface contact with the bottom face of all the battery cells 111. At the same time, the support assembly 14 is arranged on the side of the heating element 13 facing away from the battery pack 11, and the support assembly 14 is connected to the end plate assembly 12.

[0052] Thus, the heating element 13 is limited between the battery pack 11 and the support assembly 14. The support assembly 14 can press the heating element 13 upward against the bottom faces of the battery cells 111, so that the heating element 13 can more fully contact the bottom faces of the battery cells 111, improving the heating effect of the heating element 13 on the battery cells 111.

[0053] With the above structure, the end plate assembly 12 can make the battery cells 111 in the battery pack 11 more stable, enabling the bottom surfaces of all the battery cells 111 to be in good contact with the heating element 13. In addition, the support assembly 14 can better press the heating element 13 against the bottom surface of the battery cell 111, making the contact between the heating element 13 and the battery cell 111 more reliable, improving the heating effect of the heating element 13 on the battery cell 111, and thus enhancing the performance of the battery module 10.

[0054] Furthermore, in this application, the heating element 13 is arranged on the bottom surface of the battery cell 111. Compared with arranging it on the side surfaces of the battery cell 111, there is no need to separately arrange heating elements on both side surfaces of the battery cell 111 to ensure the uniform heating of the battery cell 111, thereby making the overall structure more concise.

[0055] As Figure 4 shown, in some embodiments, the support assembly 14 includes a tray 141, and the tray 141 is connected to the end plate assembly 12.

[0056] Furthermore, the end plate assembly 12 includes a fixed end plate 121 and a limiting member 122. The fixed end plates 121 are respectively arranged at opposite ends of the battery pack 11 along the first direction a, and the limiting member 122 surrounds the outer peripheries of the fixed end plates 121 and the battery pack 11 to limit all the battery cells 111 between the fixed end plates 121.

[0057] Specifically, the battery cells 111 in the battery pack 11 are arranged in sequence along the first direction a. The two fixed end plates 121 are respectively arranged at opposite ends of all the battery cells 111 along the first direction a, so that the two fixed end plates 121 can limit all the battery cells 111 along the first direction a.

[0058] Among them, the size of the fixed end plate 121 is set to match the size of the large surface 1111 of the battery cell 111, so that the battery cells 111 at both ends can be better pressed against the fixed end plate 121.

[0059] Furthermore, the limiting member 122 can be set as a steel strip, and the steel strip is surrounded around the outer peripheries of the fixed end plates 121 and the battery pack 11. In this way, all the battery cells 111 are limited, and the battery cells 111 can be stably pressed against the fixed end plate 121 along the first direction a, forming a more stable overall structure.

[0060] Specifically, the pallet 141 has a thin plate-like structure and is disposed at the bottom of the battery pack 11. Both ends of the pallet 141 are connected to the fixed end plate 121, so that there is a spaced arrangement between the pallet 141 and the bottom surface of the battery cell 111. When the heating element 13 is clamped between the battery pack 11 and the pallet 141, an upward pressing force is provided to the heating element 13 through the pallet 141, providing double protection for the heating element 13 and preventing the heating element 13 from detaching from the bottom surface of the battery cell 111.

[0061] Thus, by providing the pallet 141, the heating element 13 can be more stably disposed on the bottom surface of each battery cell 111, enabling the heating element 13 to closely fit the bottom surface of each battery cell 111, which is convenient for heat conduction.

[0062] As Figure 5 shown, in some embodiments, the pallet 141 includes a main body portion 1411 and a connecting portion 1412 that are connected to each other. The connecting portion 1412 is disposed at opposite ends of the main body portion 1411 along the first direction a and is detachably connected to the end plate assembly 12.

[0063] Specifically, the main body portion 1411 is provided with a thin plate-like structure, and there are two connecting portions 1412, which are respectively disposed at opposite ends of the main body portion 1411 along the first direction a. During the assembly process, the connecting portion 1412 can be connected to the fixed end plate 121, so that the main body portion 1411 can be smoothly spaced from the bottom surface of the battery cell 111, and the heating element 13 is clamped between the bottom surface of the battery cell 111 and the main body portion 1411.

[0064] Furthermore, the connecting portion 1412 and the end plate assembly 12 can be detachably connected by bolt connection. That is, bolt holes are respectively formed at corresponding positions of the connecting portion 1412 and the end plate assembly 12, the bolt holes of the two are aligned with each other, and bolts are screwed into the bolt holes to achieve the detachable connection between the two.

[0065] It can be understood that in some other embodiments, the connecting portion 1412 and the end plate assembly 12 can also be detachably connected by other structures, such as snap connection. That is, a clamping portion is provided on the end plate assembly 12, and a fastening portion is provided on the connecting portion 1412, so that the clamping portion and the fastening portion are snapped together to achieve the detachable connection between the connecting portion 1412 and the end plate assembly 12.

[0066] Through the above structure, the quick disassembly and assembly between the pallet 141 and the end plate assembly 12 can be realized, facilitating the assembly operation. In addition, when multiple battery modules 10 are stacked, the pallet 141 is located between the upper and lower battery modules 10, and can effectively block the high-temperature gas and electrolyte generated by the spray valve when the battery cell 111 in the lower battery module 10 undergoes thermal runaway, avoiding affecting the normal operation of the upper battery cell 111.

[0067] As Figure 6 shown, in some embodiments, the support assembly 14 further includes an elastic member 142, and the elastic member 142 is disposed between the pallet 141 and the heating member 13.

[0068] Specifically, the elastic member 142 is between the pallet 141 and the heating member 13, and can transmit a pressing force to the heating member 13 under the action of the supporting force of the pallet 141, so that the heating member 13 can be more closely pressed against the bottom surface of the battery cell 111.

[0069] Furthermore, the elastic member 142 is compressively disposed between the pallet 141 and the heating member 13, making the setting of the heating member 13 more stable, and thus the contact with the bottom surface of the battery cell 111 more reliable.

[0070] Wherein, the elastic member 142 being compressively disposed between the pallet 141 and the heating member 13 specifically means that the elastic member 142 is in a compressed state when between the pallet 141 and the heating member 13, so as to be able to smoothly transmit the supporting force of the pallet 141 to the heating member 13.

[0071] By providing the elastic member 142, the stability of the heating member 13 relative to each battery cell 111 can be further improved, making the heating member 13 fit more closely to the bottom surface of each battery cell 111 and effectively improving the heating effect.

[0072] In some embodiments, as Figure 5 shown, the pallet 141 includes a main body portion 1411 and a connecting portion 1412 that are connected to each other, and the connecting portion 1412 is disposed at opposite ends of the main body portion 1411 along the first direction a. Wherein, the elastic member 142 is disposed on the surface of the main body portion 1411 facing the heating member 13.

[0073] Specifically, after the pallet 141 is assembled with the battery pack 11 through the end plate assembly 12, the main body portion 1411 of the pallet 141 is correspondingly disposed opposite to the bottom surfaces of all the battery cells 111, and the connecting portion 1412 is correspondingly disposed with the end plate assembly 12, so as to facilitate the detachable connection between the connecting portion 1412 and the end plate assembly 12.

[0074] When the connecting part 1412 is connected to the end plate assembly 12, there is a gap between the main body part 1411 and the bottom surface of the battery cell 111. The heating element 13 and the elastic element 142 are stacked in the gap between the main body part 1411 and the bottom surface of the battery cell 111, and the elastic element 142 is located between the main body part 1411 and the heating element 13.

[0075] In this way, the main body part 1411 can better provide a pressing force to the elastic element 142, and the pressing force is transmitted to the heating element 13 through the elastic element 142, so that the heating element 13 and the bottom surface of the battery cell 111 are more closely attached.

[0076] In some embodiments, the elastic element 142 is configured as a foam, and the foam is compressively arranged between the support plate 141 and the heating element 13.

[0077] Specifically, when the foam is arranged between the main body part 1411 and the heating element 13, it is in a compressed state, so that it can better transmit the pressing force to the heating element 13 under the support of the main body part 1411.

[0078] Furthermore, the foam also has a certain heat preservation effect, which can further improve the heating effect of the heating element 13 on the battery cell 111 in a low-temperature environment. In addition, when one or more battery cells 111 in the battery pack 11 have a thermal runaway, the foam can also effectively block the temperature transmission and better protect the battery cell 111.

[0079] Of course, in some other embodiments, the elastic element 142 can also adopt other elastic structures such as springs, silica gels, rubbers, etc., which can be specifically selected according to actual use requirements and will not be elaborated here.

[0080] In some embodiments, the size of the heating element 13 matches the area of the main body part 1411.

[0081] Specifically, when the support plate 141 and the battery pack 11 are assembled with each other, the main body part 1411 corresponds to the bottom surfaces of all the battery cells 111, and the connecting part 1412 corresponds to the end plate assembly 12, so as to facilitate the connection between the connecting part 1412 and the end plate assembly 12.

[0082] Among them, the area of the main body part 1411 matches the total area of the bottom surfaces of all the battery cells 111, so that the main body part 1411 can better correspond to the bottom surfaces of all the battery cells 111.

[0083] The size of the heating element 13 matches the area of the main body portion 1411. That is, when the heating element 13 is disposed between the battery pack 11 and the main body portion 1411, the heating element 13 can better cover the main body portion 1411 and the bottom surfaces of all the battery cells 111. That is to say, the heating element 13 is arranged as a whole piece structure, which can better fit the bottom surfaces of all the battery cells 111, facilitating heat transfer.

[0084] As Figure 7 shown, in some embodiments, the connecting portion 1412 protrudes from the main body portion 1411 toward the side close to the end plate assembly 12 for limiting the heating element 13 in the first direction a.

[0085] Specifically, the connecting portion 1412 protrudes from the side close to the end plate assembly 12, such that a height difference is formed between the connecting portion 1412 and the main body portion 1411. In this way, when the pallet 141 is assembled on the battery pack 11, the connecting portion 1412 is connected to the end plate assembly 12. Since the main body portion 1411 is lower than the connecting portion 1412, a gap is smoothly formed between the main body portion 1411 and the bottom surfaces of the battery cells 111, so as to sandwich the heating element 13 and the elastic member 142 between the bottom surfaces of the battery cells 111 and the main body portion 1411.

[0086] In addition, since the connecting portion 1412 is disposed higher than the main body portion 1411, when the heating element 13 and the foam are disposed on the main body portion 1411, the connecting portions 1412 at opposite ends of the main body portion 1411 can limit the heating element 13 and the foam, such that the heating element 13 and the foam can be more stably disposed between the bottom surfaces of the battery cells 111 and the main body portion 1411.

[0087] As a specific embodiment, the elastic member 142 can be adhesively bonded to the main body portion 1411 by double-sided tape. Of course, it can also be fixedly connected to the main body portion 1411 by glue or other means.

[0088] Please refer to Figure 8 and, in some embodiments, the connecting portions 1412 at opposite ends of the main body portion 1411 are symmetrically arranged about the center of the main body portion 1411.

[0089] Specifically, the main body portion 1411 is rectangularly arranged, and the center of the main body portion 1411 is the geometric center of the rectangle. Symmetrically arranging the two connecting portions 1412 about the center of the main body portion 1411 can more conveniently connect the connecting portion 1412 to the end plate assembly 12, facilitating installation.

[0090] Continuing as Figure 1 shown, in some embodiments, the heating element 13 includes a heating film, and the heating film is attached to the bottom surfaces of all the battery cells 111.

[0091] Specifically, the heating film can be attached to the bottom surface of all the battery cells 111 through double-sided tape, so that good contact can be achieved between the heating film and the bottom surface of the battery cells 111, facilitating heat transfer.

[0092] It can be understood that the heating element 13 can also include other heating structures, such as a heating plate, which can also achieve heating of the battery cells 111 and will not be elaborated here.

[0093] As Figure 9 shown, based on the same concept as the above battery module 10, the present application also provides a battery pack 100, which includes at least two battery modules 10, at least one battery module 10 being the battery module 10 as described above, and the battery modules 10 are sequentially stacked along the second direction b. Among them, the second direction b intersects with the bottom surface of the battery cell 111.

[0094] Specifically, when the battery cells 111 in each battery group 11 are sequentially arranged along their own thickness directions, the second direction b can be set as the height direction of the battery cell 111, that is, the second direction b is perpendicular to the bottom surface of the battery cell 111. Of course, in some other embodiments, the second direction b can also be set as other directions intersecting with the bottom surface of the battery cell 111. For example, the battery modules 10 are stacked obliquely, and the stacking structure of the battery modules 10 can be specifically set according to actual use conditions and will not be elaborated here.

[0095] In this way, when multiple battery modules 10 are sequentially stacked along the height direction of the battery cell 111, the bottom surface of the support plate 141 in the upper battery module 10 faces the top surface of the lower battery module 10.

[0096] It should be noted that during the cycling of the battery cell 111, electrochemical reactions occur inside, accompanied by the generation of heat and gas. When the internal pressure of the battery cell 111 increases and thermal runaway occurs, it may cause the pressure relief valve at the top of the battery cell 111 to be opened, and the high-temperature gas and electrolyte inside the battery cell 111 will rush out through the pressure relief valve. If the high-temperature gas and electrolyte impact the upper battery module 10, it may affect the normal operation of the battery cells 111 in the upper battery module 10.

[0097] Therefore, when multiple battery modules 10 are sequentially stacked along the height direction, the support plate 141 in the upper battery module 10 is located at the bottom and faces the lower battery module 10. In this way, when thermal runaway occurs in the battery cells 111 in the lower battery module 10, the support plate 141 can block the high-temperature gas and electrolyte rushing out of the pressure relief valve, enabling the battery cells 111 in the upper battery module 10 to continue to operate normally. In addition, the foam can also relieve the transfer of high temperature, further improving the safety performance.

[0098] Further, the heating film is disposed at the bottom of the battery pack 11, and the pallet 141 can press the foam upward against the heating film, so that the heating film can more fully contact the bottom surfaces of the battery cells 111, improving the heating effect of the heating film on the battery cells 111.

[0099] Based on the same concept as the above-mentioned battery pack 100, the present application also provides an energy storage device including the battery pack 100 as described above.

[0100] According to one or more embodiments, when the present application is specifically used, first, the battery module 10 is assembled. Specifically, the battery cells 111 are sequentially arranged along their own thickness directions, and then the two fixed end plates 121 are respectively placed at opposite ends of all the battery cells 111 along the arrangement direction of the battery cells 111, and the limiting members 122 are used to limit the fixed end plates 121 and all the battery cells 111 to form an integral structure.

[0101] Further, the heating film is attached to the bottom surfaces of the battery cells 111 by using double-sided tape, and the foam is attached to the surface of the main body portion 1411 facing the battery pack 11 by using double-sided tape. The connecting portion 1412 is connected to the fixed end plate 121 by using a bolt connection method, so that the foam is compressively disposed between the heating film and the main body portion 1411. In this way, the foam can provide a pressing force on the heating film under the supporting action of the pallet 141, so that the heating film can be more closely attached to the bottom surface of the battery cell 111 to facilitate heat conduction.

[0102] Two or more battery modules 10 are sequentially stacked along the height direction of the battery cells 111, so that the pallet 141 at the bottom of the upper battery module 10 faces the top of the lower battery module 10. When a thermal runaway occurs in the battery cells 111 in the lower battery module 10, the pallet 141 can prevent the thermal runaway battery cells 111 from affecting other battery cells 111 in the upper layer, improving the safety performance of the battery pack 100.

[0103] The technical features of the above-described embodiments can be arbitrarily combined. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification.

[0104] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A battery module, characterized in that, Comprising: A battery pack, including a plurality of battery cells, and each of the battery cells is arranged in sequence along a first direction; An end plate assembly, surrounding the outer periphery of the battery pack, for fixing each of the battery cells; A heating element, disposed at the bottom of the battery pack and in contact with the bottom surfaces of all the battery cells; And A support assembly, connected to the end plate assembly and disposed on a side of the heating element away from the battery pack, and the support assembly is configured to provide a pressure pressing on each of the battery cells to the heating element.

2. The battery module according to claim 1, wherein The support assembly includes a support plate, and the support plate is connected to the end plate assembly.

3. The battery module according to claim 2, characterized in that, The support plate includes a main body portion and connecting portions connected to each other, and the connecting portions are disposed at opposite ends of the main body portion along the first direction and are detachably connected to the end plate assembly.

4. The battery module according to claim 2, wherein, The support assembly further includes an elastic member, and the elastic member is disposed between the support plate and the heating element.

5. The battery module according to claim 4, wherein The support plate includes a main body portion and connecting portions connected to each other, and the connecting portions are disposed at opposite ends of the main body portion along the first direction; Wherein, the elastic member is disposed on a surface of the main body portion facing the heating element.

6. The battery module according to claim 4, wherein, The elastic member is configured as a foam, and the foam is compressively disposed between the support plate and the heating element.

7. The battery module according to claim 3, characterized in that, The size of the heating element matches the area of the main body portion.

8. The battery module according to claim 3, wherein The connecting portion protrudes toward a side close to the end plate assembly on the main body portion, for limiting the heating element along the first direction.

9. The battery module according to claim 3, characterized in that, The connecting portions located at opposite ends of the main body portion are symmetrically arranged about the center of the main body portion.

10. The battery module according to claim 1, characterized in that, The heating element includes a heating film, and the heating film is attached to the bottom surfaces of all the battery cells.

11. The battery module according to claim 1, characterized in that, The end plate assembly includes a fixed end plate and a limiting member, the fixed end plate is respectively disposed at opposite ends of the battery pack along the first direction, and the limiting member surrounds the outer peripheries of the fixed end plate and the battery pack to limit all the battery cells between the fixed end plates.

12. A battery pack, characterized in that, Including at least two battery modules, at least one of the battery modules being the battery module according to any one of claims 1-11, and each of the battery modules is stacked in sequence along a second direction; Wherein, the second direction intersects with the bottom surface of the battery cell.

13. An energy storage device, characterized in that, Including the battery pack according to claim 12.

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