Elastic seal, battery module and electric device

Abstract

The application provides an elastic sealing piece, a battery module and an electric equipment, and relates to the technical field of batteries.The elastic sealing piece has a first state after being compressed, and when in the first state, the elastic sealing piece is used for closing a groove of the battery module, and a gap is formed between at least part of the elastic sealing piece and a first bending section of the battery module.Under the compression of a mold, the elastic sealing piece is compressed to achieve the purpose of closing the groove, and the situation that glue overflows into the groove during injection in the battery manufacturing process is prevented, so that the first bending section is not excessively extruded and compressed, the purpose of protecting the battery is achieved, and the problem that the battery is easily damaged after the injection glue process is solidified in the prior art is solved.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more specifically, to an elastic seal, a battery module, and an electrical device. Background Technology

[0002] Dual-cell technology refers to a battery system composed of two independent cells. Compared to a single-cell system, a dual-cell structure can withstand higher charging and discharging power, thus improving the battery's fast-charging capability. Furthermore, if one cell fails, the other can still function. Currently, during the welding and injection molding process of dual-cell batteries, the injection molding compound may fill the gaps between the two cells. After the compound cures, this can easily lead to adhesion and pulling of the cells, causing compression and damage, thus affecting the battery's safety. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide an elastic seal, a battery module and an electrical device, which aims to solve the technical problem that the battery is easily damaged after the injection molding process is cured in the prior art.

[0004] To achieve the above objectives, the technical solution adopted in this application is as follows: A first aspect of the present invention provides an elastic seal that has a first state when compressed; when in the first state, the elastic seal is used to close a groove of a battery module, and at least a portion of the elastic seal forms a gap with a first curved section of the battery module.

[0005] In one possible embodiment of the present invention, the elastic seal has a second state in its natural state, and when the second state switches to the first state, the compression ratio D of the elastic seal satisfies: 10%≤D≤35%.

[0006] In one possible embodiment of the present invention, the cross-section of the elastic seal is a trapezoidal or wedge-shaped structure, and the side of the elastic seal is provided with a straight portion, which is provided corresponding to the first curved section and forms the gap.

[0007] In one possible embodiment of the invention, the side of the elastic seal is formed with a stepped structure, and the side of the elastic seal is provided corresponding to the first curved section and forms the gap.

[0008] In one possible embodiment of the invention, the side of the elastic seal is formed with a wavy structure, and the side of the elastic seal is provided corresponding to the first curved section and forms the gap.

[0009] In one possible embodiment of the present invention, the elastic seal is provided with a second curved section, which corresponds to the first curved section. When the elastic seal is in the first state, the gap is formed between the second curved section and the first curved section.

[0010] In one possible embodiment of the present invention, a first surface and a second surface are respectively provided at opposite ends of the elastic seal along the first direction. The second surface abuts against the bottom of the groove. The length of the first surface along the second direction is greater than the length of the second surface. When in the first state, the first surface and the groove opening are on the same plane, and the second direction is perpendicular to the first direction.

[0011] In one possible embodiment of the present invention, the length of the first surface along the second direction is L1, and the length of the second surface along the second direction is L2, which satisfies: 1 < L1 / L2 ≤ 5.

[0012] In one possible embodiment of the present invention, the material of the elastic seal is one of silicone, elastic rubber, thermoplastic polyurethane, and thermoplastic elastomer.

[0013] A second aspect of the present invention provides a battery module comprising at least two battery cells and the elastic seal described in any of the above embodiments; At least two of the battery cells are arranged side by side, each of the battery cells is provided with the first bending section, and the first bending sections of two adjacent battery cells are arranged opposite to each other and define the groove. The elastic seal is inserted into the groove, and at least a portion of the elastic seal forms a gap with the first curved section.

[0014] In one possible embodiment of the invention, the elastic seal is in a second state before injection molding, the second state being the natural state of the elastic seal, the elastic seal being placed in the groove between two adjacent battery cells; When the pressing mold is pressed, the elastic seal is compressed and deformed into the first state.

[0015] In one possible embodiment of the invention, when in the first state, the height of the elastic seal after being compressed along the first direction is equal to the groove depth.

[0016] In one possible embodiment of the present invention, the length of the groove along the third direction is L3, and the length of the elastic seal along the third direction is L4, satisfying: 0.05L3≤L4≤L3, and the third direction is perpendicular to the first direction and the second direction, respectively.

[0017] A third aspect of the present invention provides an electrical device comprising the battery module described in any of the above embodiments.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention provides an elastic seal, a battery module, and an electrical device. The battery cell is provided with a first bending section. The first bending sections of two adjacent battery cells are arranged opposite each other, and a groove is formed between the first bending sections of two battery cells arranged side by side. The elastic seal is inserted into the groove. In its natural state, the height of the elastic seal is greater than the depth of the groove, allowing the elastic seal to extend out of the groove. Under the pressing action of the mold, the elastic seal is compressed into a second state, achieving the purpose of sealing the groove. This prevents the overflow of glue into the groove during the injection molding process in the battery manufacturing process. At least a gap is formed between a portion of the elastic seal and the first bending section, so that the elastic seal will not excessively squeeze or press the first bending section after compression, avoiding damage to the first bending section and achieving the purpose of protecting the battery cell, thereby improving the safety performance of the battery. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the first state of the battery module provided in some embodiments of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the second state of the battery module provided in some embodiments of the present invention. Figure 1 ; Figure 3 This is a schematic diagram of the first state of the battery module provided in some embodiments of the present invention. Figure 2 ; Figure 4 This is a schematic diagram of the first state of the battery module provided in some embodiments of the present invention. Figure 3 ; Figure 5 This is a schematic diagram of the first state of the battery module provided in some embodiments of the present invention. Figure 4 .

[0021] Explanation of key component symbols; 100-Battery module; 110-Battery cell; 111-First bending section; 112-Groove; 120-Elastic seal; 121-First surface; 122-Second surface; 123-Straight section; 124-Stepped structure; 125-Second bending section; 126-Wave structure; 130-Gap; 200-Pressure mold; X-First direction; Y-Second direction. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0025] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0027] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0028] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0029] In related technologies, dual-cell technology refers to a battery system composed of two independent cells. Compared to a single-cell system, a dual-cell structure can withstand greater charging and discharging power, thereby improving the battery's fast-charging capability. Furthermore, if one cell fails, the other cell can still function. When dual cells are arranged side-by-side, grooves are created between them. During the injection molding of the protective plate, the injection molding compound can easily overflow into the grooves between the dual cells. The inventors of this application discovered in their research that during the injection molding of a dual-cell battery, the injection molding compound may fill the gaps between the two cells. After the compound cures, this can easily lead to cell adhesion and pulling, causing cell compression and damage, thus affecting the battery's safety.

[0030] Please refer to Figure 1 and Figure 2As shown, to solve the above-mentioned technical problems, embodiments of this application provide an elastic seal 120, which has a first state after being compressed. In the first state, the elastic seal 120 is used to seal the groove 112 of the battery module 100. At least a portion of the elastic seal 120 forms a gap 130 between itself and the first bent section 111 of the battery module 100. Correspondingly, the battery cell 110 is provided with a first bent section 111. The first bent sections 111 of two adjacent battery cells 110 are arranged opposite each other, and a groove 112 is formed between the first bent sections 111 of two side-by-side battery cells 110, allowing the elastic seal 120 to be inserted into the groove 112. In its natural state, the height of the elastic seal 120 is greater than the depth of the groove 112, allowing the elastic seal 120 to extend outwards. Under the pressing action of the mold, the elastic seal 120 in the groove 112 is compressed into a first state, thereby sealing the groove 112 and preventing the overflow of glue into the groove 112 during the injection molding process in the battery manufacturing process. At least a gap 130 is formed between the elastic seal 120 and the first bent section 111. The elastic seal 120 may partially contact the first bent section 111 or not contact the first bent section 111, so that the elastic seal 120 will not excessively squeeze or press the first bent section 111 after compression, thus avoiding damage to the first bent section 111 and achieving the purpose of protecting the cell 110, thereby improving the safety performance of the battery.

[0031] Among them, combined Figure 1 and Figure 2 As shown, the elastic seal 120 has a second state in its natural state and a first state after being compressed. In the second state, the height of the elastic seal 120 along the first direction X is greater than the depth of the groove 112. In its natural state, the height of the elastic seal 120 is greater than the depth of the groove 112, allowing the elastic seal 120 to extend out of the groove 112. In the first state, the elastic seal 120 closes the groove 112, and at least a portion of the elastic seal 120 forms a gap 130 with the first bent section 111. Under the pressure of the mold, the elastic seal 120 is compressed into the first state. The elastic seal 120 is positioned to seal the groove 112, preventing the glue from overflowing into the groove 112 during injection molding in the battery manufacturing process. At least a portion of the elastic seal 120 and the first bent section 111 form a gap 130, which forms a certain buffer space. This prevents the elastic seal 120 from excessively squeezing and pressing the first bent section 111 after compression, thus avoiding damage to the first bent section 111 and protecting the battery cell 110, thereby improving the battery's safety performance.

[0032] It is easy to understand that when two adjacent battery cells 110 are arranged side by side, a groove 112 structure is formed between the two cells 110. During the battery welding protection board process, injection molding is usually required to enhance structural strength and sealing. Due to the pressing effect of the injection mold, the adhesive material can easily flow into the groove 112 between the two battery cells 110. After the adhesive material cures, it will exert a tensile force on the first bending section 111 of the battery cell 110 during the battery drop test, causing the battery cell 110 to break, posing a safety hazard.

[0033] As is easily understood, the compression ratio of the elastic seal 120 refers to the relative deformation between the original height and the compressed height of the elastic seal 120 under assembled or compressed conditions. It is used to measure the degree of compression of the elastic seal 120 under compressed conditions to evaluate the sealing performance, cushioning capacity and rebound capacity of the elastic seal 120.

[0034] The elastic seal 120 has a second state in its natural state. When switching from the second state to the first state, the compression ratio D of the elastic seal 120 satisfies: 10%≤D≤35%.

[0035] In one embodiment, alternatively, referencing Figure 1 and Figure 2As shown, when switching from the second state (natural state) to the first state, the compression ratio D of the elastic seal 120 is as follows: The compression ratio D refers to the difference between the height of the elastic seal 120 along the first direction X in the second state and the height of the elastic seal 120 along the first direction X in the first state. The ratio of this difference to the height of the elastic seal 120 along the first direction X in the second state (natural state) satisfies: 10%≤D≤35%, that is, the compression ratio D of the elastic seal 120 is greater than or equal to 10%, ensuring that the elastic seal 120 has a certain compression ratio, realizing the elastic deformation of the elastic seal 120 to fill the groove 112, avoiding the rubber material from entering the groove 112 during the injection molding process, and preventing the rubber material from generating tensile force after curing, which would damage the battery cell 110. For example, the groove depth along the first direction X of the groove 112 is 0.90mm, and the height along the first direction X of the elastic seal 120 can be 1.00mm, 1.05mm, 1.10mm, 1.20mm, and 1.30mm, respectively. The compression ratio D of the elastic seal 120 is less than or equal to 35%. This prevents the compression ratio D of the elastic seal 120 from being too high, which would compress the first bent section 111 of the battery cell 110, thereby preventing deformation, damage, or even breakage of the first bent section 111 of the battery cell 110. Furthermore, when the groove depth of the groove 112 along the first direction X is 0.90 mm, the height of the elastic seal 120 along the first direction X in the second state (natural state) can be any value between 1.05 mm and 1.40 mm. For example, the height of the elastic seal 120 along the first direction X in the second state (natural state) can be 1.10 mm, 1.20 mm, 1.30 mm, 1.35 mm, etc., which will not be described in detail here.

[0036] It should be noted that for the elastic seals 120, each elastic seal 120 has the same length and width; the only difference between them is their height. We measured the height of each elastic seal 120 in the first state (compressed state) and the height of each elastic seal 120 in the second state (natural state) as the test object. The test environment temperature was 25℃. In the second state, the pressing mold 200 can simultaneously press the battery cell 110 and the elastic seal 120. The groove depth of the groove 112 is 0.90mm. The height of the elastic seal 120 in the second state (natural state) is selected as 0.95mm, 1.00mm, 1.05mm, 1.20mm, 1.30mm, and 1.50mm. There are 15 elastic seals 120 of each height. Each elastic seal 120 is measured with a micrometer, and the average of the measured results of the elastic seals 120 of each height is taken. The average of the results can be used as the reference standard for the elastic seal 120 of that height in the first state (compressed state) and the second state (natural state).

[0037] After testing, the performance test results of the elastic seals 120 in Examples 1 to 4 and Comparative Examples 1 to 2 are shown in Table 1: Table 1

[0038] As shown in Table 1, in Comparative Example 1, the compression ratio D = 5.2%. Since the compression ratio is less than 10%, the elastic seal 120 may overflow during the injection molding process. After the adhesive cures, it may pull on the battery cell 110, causing damage to the battery cell 110. Furthermore, the gap 130 between the elastic seal 120 and the first bending section 111 is too large. In Comparative Example 2, the compression ratio D = 40%. Since the compression ratio is greater than 35%, the elastic seal 120 may not overflow during the injection molding process. However, since there is no gap between the elastic seal 120 and the first bending section 111 after compression, the elastic seal 120 in Comparative Example 2 may press or squeeze the battery cell 110 during the injection molding process, thus posing a safety risk. For embodiments one to four, when the compression ratio D satisfies: 10%≤D≤35%, the compressed elastic seal 120 can simultaneously prevent the rubber material in the groove 112 from entering and avoid the absence of gap between the elastic seal 120 and the first bending section 111, thus ensuring the safety of the battery cell 110.

[0039] Optionally, refer to Figure 3 As shown, the cross-section of the elastic seal 120 is trapezoidal or wedge-shaped. A straight portion 123 is provided on the side of the elastic seal 120 facing the battery cell 110. The straight portion 123 is provided corresponding to the first curved section 111 and forms a gap 130. The elastic seal 120 has a trapezoidal cross-sectional structure or a wedge-shaped cross-sectional structure. The side of the elastic seal 120 facing the battery cell 110 is a straight portion 123. When the elastic seal 120 is compressed to the first state, the straight portion 123 of the elastic seal 120 and the first curved section 111 form a certain gap 130 to provide a certain deformation space, avoid the straight portion 123 from causing excessive compression to the first curved section 111, ensure the safety of the battery cell 110, and can also adapt to the deformation of the battery cell 110 caused by thermal expansion or mechanical stress during charging and discharging.

[0040] Optionally, refer to Figure 4As shown, the elastic seal 120 forms a stepped structure 124 on the side facing the battery cell 110, making the side of the elastic seal 120 facing the battery cell 110 a stepped structure 124. The side of the elastic seal 120 is provided with a gap 130 corresponding to the first bending section 111. Multiple steps are arranged sequentially along the side of the elastic seal 120. When the elastic seal 120 is compressed and in the first state, on the one hand, when multiple steps abut against the first bending section 111, a multi-stage stress response is formed between the elastic seal 120 and the first bending section 111, which effectively avoids local stress concentration caused by a single contact position, reduces the possibility of damage to the battery cell 110, and ensures the safety of the battery cell 110. On the other hand, it can also prevent the injection molding material from entering the groove 112 sequentially through multiple steps. Multiple steps abut against the first bending section 111 respectively to play a multi-level sealing role and prevent seal failure.

[0041] Optionally, refer to Figure 5 As shown, the elastic seal 120 forms a wave-shaped structure 126 on the side facing the battery cell 110. A gap 130 is formed on the side of the elastic seal 120 corresponding to the first curved section 111. The side of the elastic seal 120 exhibits a periodic undulating geometric shape. The wave-shaped structure 126 can be a sine wave, sawtooth wave, rectangular wave, etc., to form a wave-like profile. The wave-shaped structure 126 on the side of the elastic seal 120 improves the contact adaptability and buffering performance between the elastic seal 120 and the first curved section 111 of the battery cell 110, achieving... Multi-point contact and local deformation effectively avoid local stress concentration caused by a single contact position, and more evenly distribute the contact pressure of the elastic seal 120, preventing damage to the first bending section 111 of the battery cell 110. In addition, the crest area of ​​the side of the elastic seal 120 of the wave-shaped structure 126 can abut against the elastic seal 120, and the trough area of ​​the side of the elastic seal 120 of the wave-shaped structure 126 has a certain gap 130 with the elastic seal 120, ensuring the sealing performance of the groove 112 and preventing the injection molding material from entering the groove 112.

[0042] Optionally, refer to Figure 1 As shown, the elastic seal 120 has a second curved section 125 on the side facing the battery cell 110. The second curved section 125 corresponds to the first curved section 111. When the elastic seal 120 is in the first state, a gap 130 is formed between the second curved section 125 and the first curved section 111. The first curved section 111 has an arc-shaped curved surface structure, and the corresponding second curved section 125 has an arc-shaped curved surface structure, so that the shape of the second curved section 125 is similar to that of the first curved section 111, so that the elastic seal 120 can match the battery cell 110. In addition, there is a certain gap between the second curved section 125 and the first curved section 111 to avoid the second curved section 125 squeezing the first curved section 111 when the elastic seal 120 is in the first state.

[0043] In one embodiment, alternatively, referencing Figure 2 As shown, a first surface 121 and a second surface 122 are respectively provided at opposite ends of the elastic seal 120 along the first direction X. The second surface 122 abuts against the bottom of the groove 112. Along the second direction Y, the length of the first surface 121 is greater than the length of the second surface 122. When in the first state, the first surface 121 and the groove opening of the groove 112 are on the same plane. Correspondingly, along the height direction of the battery module 100, the first surface 121 and the second surface 122 are respectively provided at opposite ends of the elastic seal 120. The second surface 122 abuts against the bottom of the groove 112, so that the elastic seal... The component 120 fills the space in the groove 112 to prevent the adhesive from entering the groove 112. The first surface 121 extends out of the groove 112 in its natural state. When in the first state, the first surface 121 and the groove 112 are on the same plane. That is, after the elastic seal 120 is compressed, the first surface 121 of the elastic seal 120 and the groove 112 are on the same plane. The pressing mold 200 simultaneously abuts against the battery cell 110 and the elastic seal 120 so that the pressing mold 200 can compress the elastic seal 120 when pressing the battery cell 110.

[0044] Furthermore, the length of the first surface 121 along the second direction Y is L1, and the length of the second surface 122 along the second direction Y is L2, satisfying: 1 < L1 / L2 ≤ 5, that is, the ratio of the length L1 of the first surface 121 to the length L2 of the second surface 122 along the width direction of the battery module 100 is greater than 1, and the ratio of the length L1 of the first surface 121 to the length L2 of the second surface 122 along the width direction of the battery module 100 is less than or equal to 5. This allows the first surface 121 and the second surface 122 of the elastic seal 120 to flexibly adapt to the size specifications of the groove 112, thereby sealing and protecting the groove 112 and preventing glue overflow into the groove 112 during the battery manufacturing process. The compressed second surface 122 of the elastic seal 120 abuts against the bottom of the groove 112. Exemplarily, the ratio of the length L1 of the first surface 121 to the length L2 of the second surface 122 along the width direction of the battery module 100 is 2.

[0045] In one embodiment, the elastic seal 120 may optionally be made of one of silicone, elastic rubber, thermoplastic polyurethane, or thermoplastic elastomer. Silicone has high weather resistance and good resilience, and excellent high and low temperature resistance. Thermoplastic polyurethane (TPU) has high abrasion resistance, tear strength, and elastic recovery. Of course, the elastic seal 120 may also be made of modified materials from silicone, elastic rubber, thermoplastic polyurethane, or thermoplastic elastomer, which have better resilience and cushioning performance. Exemplarily, the elastic seal 120 may be integrally molded; however, it may also be a split structure, without specific limitations.

[0046] Embodiments of this application also provide a battery module 100, which includes at least two battery cells 110 and the elastic seal 120 in any of the above embodiments.

[0047] Specifically, such as Figure 1 As shown, at least two battery cells 110 are arranged side by side. The number of battery cells 110 can be two, three or four, and there is no specific limitation here. Each battery cell 110 is provided with a first bending section 111. The first bending sections 111 of two adjacent battery cells 110 are arranged opposite each other and define a groove 112. An elastic seal 120 is inserted into the groove 112. The battery cells 110 are provided with a first bending section 111. The first bending sections 111 of two adjacent battery cells 110 are arranged opposite each other. A groove 112 is formed between the first bending sections 111 of two battery cells 110 arranged side by side, so that the elastic seal 120 is inserted into the groove 112.

[0048] refer to Figures 1 to 5 As shown, the battery module 100 has a first direction X, a second direction Y, and a third direction (not shown in the figure), wherein the first direction X, the second direction Y, and the third direction are perpendicular to each other in pairs. For example, the first direction X is taken as the height direction of the battery module 100, the second direction Y is taken as the width direction of the battery module 100, and the third direction is taken as the length direction of the battery module 100. It is understood that the above definitions are only for the purpose of understanding the relative positional relationships of the various parts in the battery module 100 and should not be construed as limiting this application.

[0049] Optionally, before injection molding, the elastic seal 120 is in a second state, with the elastic seal 120 placed in the groove 112 between two adjacent battery cells 110; during pressing by the compression mold 200, the elastic seal 120 is compressed and deformed into a first state, correspondingly, such as Figure 1 As shown, before injection molding, the elastic seal 120 is in the second state, which is the natural state of the elastic seal 120. At this time, the elastic seal 120 is not compressed. The elastic seal 120 is placed in the groove 112 between two adjacent cells 110, as shown. Figure 2 As shown, when the pressing mold 200 is pressing, the elastic seal 120 is compressed and deformed into a first state, which is the compressed state of the elastic seal 120.

[0050] Optionally, such as Figure 2 As shown, when in the first state, the height of the elastic seal 120 after being compressed along the first direction X is equal to the groove depth of the groove 112. That is, when the elastic seal 120 is in the first state, the height of the elastic seal 120 after being compressed along the first direction X is equal to the groove depth of the groove 112. At this time, when the pressing mold 200 presses, it compresses the elastic seal 120 to the groove opening position of the groove 112, so that the elastic seal 120 is contained in the groove 112. At least a gap 130 is formed between the elastic seal 120 and the first bent section 111 of the battery cell 110, so that the elastic seal 120 and the first bent section 111 are not completely fitted together. This avoids the situation where the elastic seal 120 causes damage to the first bent section 111 of the battery cell 110 due to pressure, and has a better technical effect.

[0051] In one embodiment, optionally, the length of the third-direction trench 112 is L3, and the length of the third-direction elastic seal 120 is L4, satisfying: 0.05L3≤L4≤L3, that is, the length of the trench 112 along the length direction of the battery module 100 is L3 and the length of the elastic seal 120 is L4, and the length of the elastic seal 120 L4 is less than or equal to the length of the trench 112 L3, so that the length of the elastic seal 120 can be placed in the trench 112, and can completely or partially fill the length direction of the closed trench 112, so that the length of the elastic seal 120 matches the length of the trench 112, achieving the desired effect. 2. The sealing effect is good, with better aesthetics and sealing performance. The length L4 of the elastic seal 120 is greater than or equal to the length 0.05L3 of the groove 112. When the length L4 of the elastic seal 120 is equal to the length 0.05L3 of the groove 112, the elastic seal 120 can at least seal the glue injection position of the pressing mold 200. Of course, the length L4 of the elastic seal 120 can be any value between 0.05L3 and L3. No specific limitation is made here. The elastic seal 120 is used to place in the groove 112 to reduce the situation where glue overflows into the groove 112 during pressing of the pressing mold 200, and avoid damage to the first bending section 111 of the battery cell 110.

[0052] For example, the length L3 of the groove 112 can be 60mm, and the length L4 of the elastic seal 120 can be 3mm, 6mm, 18mm, 35mm, 50mm, or 60mm; the length L3 of the groove 112 can also be 80mm, in which case the length L4 of the elastic seal 120 can be 4mm, 10mm, 15mm, 35mm, 60mm, or 80mm, etc.

[0053] In summary, the battery cell 110 is provided with a first bending section 111. The first bending sections 111 of two adjacent cells 110 are arranged opposite each other, and a groove 112 is formed between the first bending sections 111 of two cells 110 arranged side by side. The elastic seal 120 is inserted into the groove 112. In its natural state, the height of the elastic seal 120 is greater than the depth of the groove 112, allowing the elastic seal 120 to extend out of the groove 112. Under the action of mold pressing, the elastic seal 120 is compressed into a second state, achieving the purpose of sealing the groove 112. This prevents the glue from overflowing into the groove 112 during the injection molding process in the battery manufacturing process. At least a gap 130 is formed between at least part of the elastic seal 120 and the first bending section 111, so that the elastic seal 120 will not excessively squeeze or press the first bending section 111 after compression, avoiding damage to the first bending section 111 and achieving the purpose of protecting the cell 110, thereby improving the safety performance of the battery.

[0054] An embodiment of the present invention provides an electrical device that includes the battery module 100 in the above embodiment. The battery module 100 serves as the power supply for the electrical device. The electrical device containing the battery module 100 has all the beneficial effects of the battery module 100, which will not be described in detail here.

[0055] The application of the battery module 100 is not particularly limited, and it can be used in any electrical device known in the prior art.

[0056] For example, the aforementioned electrical equipment can be, but is not limited to, laptops, electric vehicles, electric cars, ships, spacecraft, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc. For instance, the battery module 100 can not only serve as the operating power source for an electric vehicle, but also as the driving power source, replacing or partially replacing fuel or natural gas to provide driving power for the electric vehicle, but is not limited to this.

[0057] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limitations; therefore, other examples of exemplary embodiments may have different values.

[0058] The above-described embodiments are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. An elastic seal, characterized in that, The elastic seal (120) has a first state after being compressed; when in the first state, the elastic seal (120) is used to close the groove (112) of the battery module (100), and at least a portion of the elastic seal (120) forms a gap (130) between it and the first curved section (111) of the battery module (100). The battery cell of the battery module (100) is provided with a first bending section (111). The first bending sections (111) of two adjacent cells (110) are arranged opposite each other, and the groove (112) is formed between the first bending sections (111) of two cells (110) arranged side by side. The elastic seal (120) has a second state in its natural state. When switching from the second state to the first state, the compression ratio D of the elastic seal (120) satisfies: 10%≤D≤35%. Along the first direction (X), the elastic seal (120) has a first surface (121) and a second surface (122) respectively at its opposite ends. The second surface (122) abuts against the bottom of the groove (112). Along the second direction (Y), the length of the first surface (121) is greater than the length of the second surface (122). When in the first state, the first surface (121) and the opening of the groove (112) are on the same plane. The second direction (Y) is perpendicular to the first direction (X).

2. The elastic seal according to claim 1, characterized in that, The cross-section of the elastic seal (120) is a trapezoidal or wedge-shaped structure. The side of the elastic seal (120) is provided with a straight part (123). The straight part (123) is provided corresponding to the first curved section (111) and forms the gap (130).

3. The elastic seal according to claim 1, characterized in that, The side of the elastic seal (120) forms a stepped structure (124), and the side of the elastic seal (120) is provided with the first curved section (111) and forms the gap (130).

4. The elastic seal according to claim 1, characterized in that, The side of the elastic seal (120) forms a wave-shaped structure (126), and the side of the elastic seal (120) is provided with the first curved section (111) and forms the gap (130).

5. The elastic seal according to claim 1, characterized in that, The elastic seal (120) is provided with a second curved section (125), which is provided in correspondence with the first curved section (111). When the elastic seal (120) is in the first state, the gap (130) is formed between the second curved section (125) and the first curved section (111).

6. The elastic seal according to claim 1, characterized in that, The length of the first face (121) along the second direction (Y) is L1, and the length of the second face (122) along the second direction (Y) is L2, which satisfies: 1 < L1 / L2 ≤ 5.

7. The resilient seal according to any one of claims 1 to 5, characterized in that, The elastic seal (120) is made of one of the following materials: silicone, elastic rubber, thermoplastic polyurethane, or thermoplastic elastomer.

8. A battery module, characterized in that, It includes at least two battery cells (110) and an elastic seal (120) as described in any one of claims 1 to 7. At least two of the battery cells (110) are arranged side by side, and each of the battery cells (110) is provided with the first bending section (111). The first bending sections (111) of two adjacent battery cells (110) are arranged opposite to each other and define the groove (112). The elastic seal (120) is inserted into the groove (112), and at least a portion of the elastic seal (120) forms a gap (130) with the first curved section (111).

9. The battery module according to claim 8, characterized in that, Before injection molding, the elastic seal (120) is in a second state, which is the natural state of the elastic seal (120), and the elastic seal (120) is placed in the groove (112) between two adjacent cells (110); When the mold is pressed, the elastic seal (120) is compressed and deformed into the first state.

10. The battery module according to claim 9, characterized in that, When in the first state, the height of the elastic seal (120) after being compressed along the first direction (X) is equal to the groove depth of the groove (112).

11. The battery module according to claim 10, characterized in that, The length of the groove (112) along the third direction is L3, and the length of the elastic seal (120) along the third direction is L4, satisfying: 0.05L3≤L4≤L3, wherein the third direction is perpendicular to the first direction (X) and the second direction (Y).

12. An electrical appliance, characterized in that, Includes the battery module (100) as described in any one of claims 8 to 11.

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