Battery module and battery pack

Abstract

The utility model relates to battery technology field provides a kind of battery module and battery package.The battery module includes electric core group, spacer and connecting piece.Electric core group includes at least two interval arrangement's single battery.Every adjacent two single battery forms expansion gap.Every adjacent two single battery is equipped with spacer. Among them, spacer is arranged as annular, and annularly set in expansion gap.Connecting piece is around set in electric core group.Thereby, expansion gap can be reserved between adjacent two single battery, and prevent pouring sealant into expansion gap, to prevent adjacent two single battery from mutual extrusion due to expansion.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a battery module and battery pack. Background Technology

[0002] In related technologies, battery packs typically include a housing and battery modules. The battery modules are placed inside the housing and secured with potting compound. A battery module usually comprises multiple individual cells, as well as end plates, side plates, and other structures. With each charge-discharge cycle, the individual cells expand to a certain extent. The expanded areas of adjacent cells can cause mutual compression, potentially leading to electrode deformation, uneven electrolyte distribution, and even thermal runaway. Utility Model Content

[0003] The present invention provides a battery module and battery pack that can reserve an expansion gap between two adjacent individual cells, and a spacer is provided in the expansion gap to prevent potting compound from entering the expansion gap, thereby preventing the two adjacent individual cells from squeezing each other due to expansion.

[0004] In a first aspect, embodiments of the present invention provide a battery module, comprising:

[0005] A battery cell assembly includes at least two spaced-apart individual battery cells, with an expansion gap formed between each pair of adjacent individual battery cells.

[0006] An isolation element is provided between each pair of adjacent individual cells, wherein the isolation element is configured as an annular element and is annularly disposed in the expansion gap;

[0007] A connector is wound around the battery cell assembly.

[0008] In one embodiment, the single battery cell includes:

[0009] case;

[0010] An electrode assembly is disposed within the housing, the electrode assembly having an expansion region, and the expansion gap corresponding to the expansion region;

[0011] The isolation element is connected to the outside of the housing and is disposed away from the expansion area of ​​the electrode assembly.

[0012] In one embodiment, the isolation member includes a first isolation portion and a second isolation portion, wherein the first isolation portion and the second isolation portion are connected end-to-end or spaced apart end-to-end.

[0013] In one embodiment, the electrode assembly includes a main body segment and a first coiled segment located at a first end of the main body segment, wherein the first isolation portion includes a first isolation segment disposed near the interface between the main body segment and the first coiled segment.

[0014] In one embodiment, the main body segment includes an expansion region and a connecting region surrounding the expansion region, wherein the orthographic projection of the first isolation segment is at least partially located within the connecting region.

[0015] In one embodiment, the electrode assembly further includes a first tab connected to the main body segment, and the first isolation portion further includes a third isolation segment, which is angled to the first isolation segment, wherein the orthographic projection of the third isolation segment is at least partially located within the first tab.

[0016] In one embodiment, the electrode assembly further includes a second coiled segment located at the second end of the main body segment, wherein the second isolation portion includes a second isolation segment, the first isolation segment and the second isolation segment are spaced apart, and the second isolation segment is disposed near the interface between the main body segment and the second coiled segment.

[0017] In one embodiment, the main body segment includes an expansion region and a connecting region surrounding the expansion region, wherein the orthographic projection of the second isolation segment is at least partially located within the connecting region.

[0018] In one embodiment, the electrode assembly further includes a second tab connected to the side of the main body segment away from the first tab, and the second isolation portion further includes a fourth isolation segment, which is angled to the second isolation segment and spaced apart from the third isolation segment, wherein the orthographic projection of the fourth isolation segment is at least partially located within the second tab.

[0019] In one embodiment, the connector is a flexible connector.

[0020] Secondly, embodiments of the present invention provide a battery pack, comprising:

[0021] Box;

[0022] As mentioned above, the battery module;

[0023] The battery module is housed within the casing.

[0024] In one embodiment, the connector is provided with a flexible member, which abuts against the side wall of the housing.

[0025] In one embodiment, the flexible element is interference-fitted with the side wall of the housing.

[0026] In one embodiment, the flexible element is configured as a ring.

[0027] In one embodiment, the casing wall has a protrusion that abuts against the battery module.

[0028] In one embodiment, a first adhesive layer is provided between the battery module and the wall surface of the housing.

[0029] In one embodiment, a second adhesive layer is provided between each two adjacent individual cells. The second adhesive layer is located outside the separator and is connected to the first adhesive layer.

[0030] The beneficial effects of the embodiments of this utility model are as follows:

[0031] In embodiments of this invention, an expansion gap is created between adjacent individual battery cells by providing a spacer between them. Since the spacer is annular and positioned within the expansion gap, when the battery module is placed inside the housing and potting compound is applied, the potting compound is blocked from flowing into the expansion gap, preventing the individual battery cells from expanding and causing mutual compression. This improves the safety and lifespan of the battery module. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the battery pack provided in an embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of the structure of the battery module provided in an embodiment of this utility model;

[0035] Figure 3 This is an exploded view of the battery module provided in an embodiment of this utility model;

[0036] Figure 4 This is a cross-sectional view of the battery module provided in an embodiment of this utility model;

[0037] Figure 5 This is a structural schematic diagram of the box provided in an embodiment of the present utility model;

[0038] Figure 6This is a schematic diagram of the electrode assembly provided in an embodiment of the present invention.

[0039] Explanation of reference numerals in the attached figures:

[0040] 1. Single battery cell; 11. Housing; 12. Electrode assembly; 1211. Expansion region; 1212. Connection region; 122. First coiled segment; 123. Second coiled segment; 131. First tab; 132. Second tab;

[0041] 2. Isolation component; 21. First isolation section; 211. First isolation segment; 212. Third isolation segment; 22. Second isolation section; 221. Second isolation segment; 222. Fourth isolation segment;

[0042] 3. Connectors;

[0043] 4. Expansion gap;

[0044] 5. Box body; 51. Protrusion;

[0045] 6. Flexible components

[0046] 71. First adhesive layer; 72. Second adhesive layer. Detailed Implementation

[0047] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0048] like Figures 1 to 6 As shown in the figure, this application embodiment provides a battery module. The battery module includes a cell assembly, a separator 2, and a connector 3. The cell assembly includes at least two spaced-apart individual cells 1. An expansion gap 4 is formed between each pair of adjacent individual cells 1. A separator 2 is provided between each pair of adjacent individual cells 1. The separator 2 is annular and is arranged around the expansion gap 4. The connector 3 is wound around the cell assembly.

[0049] In this embodiment, an expansion gap 4 is created between two adjacent individual battery cells 1 by providing a spacer 2 between them. Since the spacer 2 is annular and surrounds the expansion gap 4, when the battery module is placed inside the housing 5 and potting compound is applied, the potting compound is blocked by the spacer 2, preventing it from flowing into the expansion gap 4 and thus preventing the individual battery cells 1 from expanding and causing mutual compression. This improves the safety and lifespan of the battery module.

[0050] Understandably, the annular separator 2 prevents the large surface area of ​​the individual battery cell 1 from being covered by potting compound, thus maintaining the gap between the individual battery cells 1 and reserving space for deformation and expansion during charge-discharge cycles, ensuring the performance of the individual battery cell 1. It should be noted that the potting compound is usually a structural adhesive.

[0051] like Figure 2 As shown, in some embodiments, the battery pack includes four spaced individual battery cells 1, which are connected in series.

[0052] In some embodiments, the separator 2 is made of PP (polypropylene) or PC (polycarbonate) material. The separator 2 can be bonded to the large surface of the single cell 1.

[0053] In some embodiments, the connector 3 is wound around the cell assembly to provide preload to the cell assembly. By using the connector 3 instead of the traditional end plate and side plate, the size of the battery module can be reduced, space utilization can be improved, and lightweight design can be facilitated.

[0054] like Figure 6 As shown, in some embodiments, the single battery cell 1 includes a housing 11 and an electrode assembly 12. The electrode assembly 12 is disposed within the housing 11. The electrode assembly 12 has an expansion region 1211. An expansion gap 4 corresponds to the expansion region 1211. A spacer 2 is connected to the outside of the housing 11 and is disposed away from the expansion region 1211 of the electrode assembly 12.

[0055] It is understandable that as the battery pack undergoes charge-discharge cycles, the electrode assembly 12 will expand to a certain extent due to lithium insertion / extraction reactions, electrolyte decomposition and gas generation, etc. Since the electrode assembly 12 is attached to the inner surface of the housing 11, the expansion of the electrode assembly 12 will cause the housing 11 to bulge, resulting in the expansion of the individual battery cell 1. In this embodiment, the separator 2 is positioned away from the expansion area 1211 of the electrode assembly 12. When the individual battery cell 1 expands, the separator 2 is not significantly compressed, and the expansion position of the individual battery cell 1 avoids the separator 2, allowing the individual battery cell 1 to expand within the expansion gap 4 inside the separator 2. Therefore, when the individual battery cell 1 expands, adjacent individual battery cells 1 will not compress each other, improving the safety and lifespan of the battery module.

[0056] Please continue reading. Figure 3 In some embodiments, the isolation member 2 includes a first isolation part 21 and a second isolation part 22, wherein the first isolation part 21 and the second isolation part 22 are connected end-to-end or are spaced apart end-to-end.

[0057] Understandably, by designing the separator 2 as a separate first separator 21 and second separator 22, the material does not need to be directly cut into a ring during the manufacturing process, thus preventing waste due to unusable material in the inner area of ​​the ring. This reduces raw material loss and achieves cost reduction.

[0058] For example, both the first isolation section 21 and the second isolation section 22 are configured as L-shaped, and the first isolation section 21 and the second isolation section 22 are connected end to end.

[0059] In some embodiments, the first isolation portion 21 and the second isolation portion 22 are connected end to end to ensure that the potting compound does not enter the internal expansion gap 4 from the connection between the first isolation portion 21 and the second isolation portion 22, and to prevent the potting compound from forming an adhesive layer in the expansion gap 4 and occupying the expansion space.

[0060] In some embodiments, the first isolation portion 21 and the second isolation portion 22 are spaced apart end to end, and a certain gap may be allowed between the first isolation portion 21 and the second isolation portion 22. Because the potting compound has a certain viscosity, the potting compound will not enter the internal expansion gap 4 through the gap between the first isolation portion 21 and the second isolation portion 22. For example, the gap between the first isolation portion 21 and the second isolation portion 22 is set to 0.2 mm. Because the potting compound has a certain viscosity, the potting compound will not enter the internal expansion gap 4 through the gap between the first isolation portion 21 and the second isolation portion 22.

[0061] It should be noted that when the first isolation part 21 and the second isolation part 22 are arranged at intervals, the size of the gap between the first isolation part 21 and the second isolation part 22 is related to the viscosity and flowability of the potting compound. The gap between the first isolation part 21 and the second isolation part 22 can be reasonably set based on different potting compounds.

[0062] Please continue reading. Figure 3 and Figure 6 In some embodiments, the electrode assembly 12 includes a main body segment and a first coiled segment 122 located at a first end of the main body segment. The first isolation portion 21 includes a first isolation segment 211. The first isolation segment 211 is disposed near the interface between the main body segment and the first coiled segment 122.

[0063] Understandably, the surface of the main body segment is typically planar, fitting against the inner surface of the housing 11. The main body segment is the primary deformation area of ​​the electrode assembly 12. The first curled segment 122 is typically arc-shaped, and it bends away from the main body segment. Because the first curled segment 122 is arc-shaped, there will be a certain gap between the first curled segment 122 and the housing 11.

[0064] It should be noted that the connection area 1212 is a solid area. The first isolation section 211 is located in the solid area, which can better transmit force and play a supporting role when the single cell 1 expands.

[0065] By positioning the first isolation section 211 close to the interface between the main body section and the first curled section 122, it is possible to prevent the first isolation section 211 from exerting a force on the housing 11 in the direction of the first curled section 122 when the individual cell 1 expands, thus preventing the housing 11 from deforming. It is also possible to prevent the first isolation section 211 from being in the main deformation position of the main body section when the individual cell 1 expands, thus preventing the space to be reserved for the expansion of the individual cell 1.

[0066] Please continue reading. Figure 3 and Figure 6 In some embodiments, the main body segment includes an expansion region 1211 and a connecting region 1212 surrounding the expansion region 1211. The orthographic projection of the first isolation segment 211 is at least partially located within the connecting region 1212.

[0067] It is understood that the expansion region 1211 is located in the middle of the main body segment and is the deformation and expansion region 1211 of the electrode assembly 12. The connecting region 1212 is arranged around the expansion region 1211, and the deformation and expansion of the connecting region 1212 is small, or even non-existent. Based on the principle that the orthographic projection of the first isolation segment 211 is at least partially located within the connecting region 1212, the first isolation segment 211 is basically unaffected by the expansion of the electrode assembly 12. Therefore, when the single cell 1 expands, the first isolation segment 211 is basically not compressed, improving the safety and service life of the battery module.

[0068] In some embodiments, the orthographic projection of the first isolation segment 211 is completely located within the connection region 1212, so that the first isolation segment 211 will not be squeezed when the single cell 1 expands, thereby improving the safety and service life of the battery module.

[0069] In some embodiments, the orthographic projection of the first isolation segment 211 is located within the connection region 1212, and a portion is located within the expansion region 1211. Since the first isolation segment 211 is only partially located within the expansion region 1211, the expansion deformation of the expansion region 1211 has a relatively small impact on the first isolation segment 211. When the individual cell 1 expands, the first isolation segment 211 is basically not compressed. Most of the expansion region 1211 of the individual cell 1 is located within the expansion gap 4 reserved in the first isolation segment 211, thereby improving the safety and service life of the battery module.

[0070] In some embodiments, the orthographic projection of the first isolation segment 211 is located within the connection region 1212, and a portion is located within the first curled segment 122. Since the first isolation segment 211 is only partially located within the first curled segment 122, the force exerted by the first isolation segment 211 on the housing 11 is small and will not cause deformation of the housing 11.

[0071] like Figure 6 As shown, in some embodiments, the expansion region 1211 is located in the middle of the main body segment, and the expansion region 1211 occupies about 2 / 3 of the total area of ​​the main body segment.

[0072] In some embodiments, the expansion region 1211 is located in the middle of the main body segment. The main body segment has dimensions of 30 cm × 30 cm. The expansion region 1211 is a 20 cm × 20 cm area in the middle.

[0073] Please continue reading. Figure 3 and Figure 6 In some embodiments, the electrode assembly 12 further includes a first tab 131. The first tab 131 is connected to the main body segment. The first isolation portion 21 further includes a third isolation segment 212. The third isolation segment 212 is angled relative to the first isolation segment 211. The orthographic projection of the third isolation segment 212 is at least partially located within the first tab 131.

[0074] It is understandable that the first tab 131 and the housing 11 are spaced apart, with a certain gap between them. By ensuring that the orthographic projection of the third isolation section 212 is at least partially located within the first tab 131, the constraint of the isolation member 2 on the electrode assembly 12 can be reduced, preventing the free expansion and breathing of the individual cell 1 from being restricted.

[0075] The third isolation segment 212 is angled to the first isolation segment 211, thereby forming a bent first isolation portion 21. In some embodiments, the third isolation segment 212 is perpendicular to the first isolation segment 211, thus forming an L-shaped first isolation portion 21. Alternatively, the third isolation segment 212 is angled acutely to the first isolation segment 211. Alternatively, the third isolation segment 212 is angled obtusely to the first isolation segment 211.

[0076] In some embodiments, the orthographic projection of the third isolation segment 212 is entirely located within the first tab 131.

[0077] In some embodiments, the orthographic projection of the third isolation segment 212 is mostly located within the first tab 131, and a small portion is located within the main body segment.

[0078] It should be noted that when the single cell 1 expands, the part of the first isolation section 21 that mainly bears the force is the first isolation segment 211, and the third isolation segment 212 is located at the position of the first tab 131 and will not cause damage to the casing 11.

[0079] Please continue reading. Figure 3 and Figure 6 In some embodiments, the electrode assembly 12 further includes a second coiled segment 123 located at the second end of the main body segment. The second isolation portion 22 includes a second isolation segment 221. The first isolation segment 211 and the second isolation segment 221 are spaced apart. The second isolation segment 221 is located near the interface between the main body segment and the second coiled segment 123.

[0080] Understandably, the surface of the main body segment is typically planar, fitting against the inner surface of the housing 11. The main body segment is the primary deformation area of ​​the electrode assembly 12. The second curled segment 123 is typically arc-shaped, and it bends away from the main body segment. Because the second curled segment 123 is arc-shaped, there will be a certain gap between it and the housing 11.

[0081] By positioning the second isolation section 221 close to the interface between the main body section and the second curled section 123, it is possible to prevent the second isolation section 221 from exerting a force on the housing 11 in the direction of the second curled section 123 when the individual cell 1 expands, thus preventing the housing 11 from deforming. It is also possible to prevent the second isolation section 221 from being in the main deformation position of the main body section when the individual cell 1 expands, thus preventing it from being unable to reserve space for the expansion of the individual cell 1.

[0082] In some embodiments, the main body segment includes an expansion region 1211 and a connecting region 1212 surrounding the expansion region 1211. The orthographic projection of the second isolation segment 221 is at least partially located within the connecting region 1212.

[0083] It is understood that the expansion region 1211 is located in the middle of the main body section and is the deformation and expansion region 1211 of the electrode assembly 12. The connection region 1212 is arranged around the expansion region 1211, and the deformation and expansion of the connection region 1212 is small, or even non-existent. Based on the principle that the orthographic projection of the second isolation section 221 is at least partially located within the connection region 1212, the second isolation section 221 is basically unaffected by the expansion of the electrode assembly 12. Therefore, when the single cell 1 expands, the second isolation section 221 is basically not compressed, improving the safety and service life of the battery module.

[0084] It should be noted that the connecting area 1212 is a solid area, and the second isolation section 221 is located in the solid area, which can better transmit force and play a supporting role when the single cell 1 expands.

[0085] In some embodiments, the orthographic projection of the second isolation segment 221 is completely located within the connection region 1212, thereby preventing the second isolation segment 221 from being squeezed when the individual cell 1 expands, thus improving the safety and service life of the battery module.

[0086] In some embodiments, the orthographic projection of the second isolation segment 221 is located within the connection region 1212, and a portion is located within the expansion region 1211. Since the second isolation segment 221 is only partially located within the expansion region 1211, the expansion deformation of the expansion region 1211 has a relatively small impact on the second isolation segment 221. When the individual battery cell 1 expands, the second isolation segment 221 is essentially not compressed. Most of the expansion region 1211 of the individual battery cell 1 is located within the expansion gap 4 reserved in the second isolation segment 221, thus improving the safety and lifespan of the battery module.

[0087] In some embodiments, the orthographic projection of the second isolation segment 221 is located within the connection region 1212, and a portion is located within the second curled segment 123. Since the second isolation segment 221 is only partially located within the second curled segment 123, the force exerted by the second isolation segment 221 on the housing 11 is small and will not cause deformation of the housing 11.

[0088] In some embodiments, the first isolation segment 211 and the second isolation segment 221 are located near the upper side and near the lower side of the single cell 1, respectively.

[0089] Please continue reading. Figure 3 and Figure 6In some embodiments, the electrode assembly 12 further includes a second tab 132. The second tab 132 is connected to the side of the main body segment away from the first tab 131. The second isolation portion 22 further includes a fourth isolation segment 222. The fourth isolation segment 222 is angled to the second isolation segment 221 and is spaced apart from the third isolation segment 212. The orthographic projection of the fourth isolation segment 222 is at least partially located within the second tab 132.

[0090] It is understandable that the second tab 132 is spaced apart from the housing 11, with a certain gap between them. By ensuring that the orthographic projection of the fourth isolation section 222 is at least partially located within the second tab 132, the constraint of the isolation member 2 on the electrode assembly 12 can be reduced, preventing the free expansion and breathing of the individual cell 1 from being restricted.

[0091] The fourth isolation segment 222 is angled to the second isolation segment 221, thereby forming a bent second isolation portion 22. In some embodiments, the fourth isolation segment 222 is perpendicular to the second isolation segment 221, thus forming an L-shaped second isolation portion 22. Alternatively, the fourth isolation segment 222 is angled acutely to the second isolation segment 221. Alternatively, the fourth isolation segment 222 is angled obtusely to the second isolation segment 221.

[0092] In some embodiments, the orthographic projection of the fourth isolation segment 222 is entirely located within the second tab 132.

[0093] In some embodiments, the orthographic projection of the fourth isolation segment 222 is mostly located within the second tab 132, and a small portion is located within the main body segment.

[0094] It should be noted that when the single cell 1 expands, the part of the second isolation section 22 that mainly bears the force is the second isolation segment 221. The fourth isolation segment 222 is located at the position of the second tab 132 and will not cause damage to the casing 11.

[0095] In some embodiments, connector 3 is a flexible connector.

[0096] It is understandable that a flexible connecting part is directly wound around the outer periphery of the cell assembly to achieve a reliable connection between at least two individual cells 1. This facilitates the assembly of the battery module, simplifies the assembly process, and promotes lightweight design of the battery module.

[0097] In some embodiments, the flexible connector can be fiberglass tape. The fiberglass tape is wrapped around and bonded to the outer periphery of at least two individual battery cells 1 to achieve a reliable connection between the at least two individual battery cells 1. The fiberglass tape can be wrapped one or more times.

[0098] In some embodiments, the flexible connector may also be configured as a polyester fiber flexible packing strap, an aramid flexible binding strap, a synthetic fiber rope, etc.

[0099] like Figure 1 As shown in the illustration, this application also provides a battery pack. The battery pack includes a housing 5 and a battery module as described in the previous embodiments. The battery module is disposed within the housing 5.

[0100] In this embodiment, an expansion gap 4 is created between two adjacent individual battery cells 1 by providing a spacer 2 between them. Since the spacer 2 is annular and surrounds the expansion gap 4, when the battery module is placed inside the housing 5 and potting compound is applied, the potting compound is blocked by the spacer 2, preventing it from flowing into the expansion gap 4 and thus preventing the individual battery cells 1 from expanding and causing mutual compression. This improves the safety and lifespan of the battery module.

[0101] like Figure 2 As shown, in some embodiments, the connector 3 is provided with a flexible member 6. The flexible member 6 abuts against the side wall of the housing 5.

[0102] Understandably, the flexible component 6 is located between the wall of the housing 5 and the outer surface of the battery module, which can prevent the battery module from forming a rigid connection with the housing 5 and prevent the housing 5 from deforming and cracking when the individual battery cell 1 expands and squeezes the housing 5.

[0103] In some embodiments, the flexible element 6 may be made of foam. The flexible element 6 is bonded to the outside of the connector 3.

[0104] In some embodiments, the flexible element 6 is interference-fitted with the side wall of the housing 5.

[0105] Understandably, by making the flexible component 6 and the side wall of the housing 5 interference fit, the flexible component 6 can be used to absorb the assembly error between the battery module and the housing 5, which facilitates the rapid assembly of the battery module.

[0106] In some embodiments, the flexible element 6 is configured as a ring.

[0107] It is understandable that an expansion gap 4 can also be formed between the individual battery cell 1 located at the edge and the side wall of the housing 5. The annular flexible part 6 can prevent the potting compound from entering the expansion gap 4 and prevent the housing 5 from deforming and cracking after the individual battery cell 1 expands and squeezes it.

[0108] In some embodiments, the flexible component 6 is configured as any shape such as a rectangle, regular polygon, circle, or ellipse.

[0109] Please continue reading. Figure 6In some embodiments, the casing 5 has a protrusion 51 on its casing wall. The protrusion 51 abuts against the battery module.

[0110] It is understandable that by providing a protrusion 51 on the wall of the housing 5 to abut the battery module, the battery module and the wall of the housing 5 can be spaced apart, thereby forming a flow gap between them to facilitate the flow of potting compound within the housing 5.

[0111] In some embodiments, both the side wall and the bottom surface of the housing 5 are provided with protrusions 51, and the protrusion heights of the two are the same. The protrusions 51 located on the side wall of the housing 5 extend along the height direction, and the protrusions 51 located on the bottom surface of the housing 5 extend along the width direction or the length direction.

[0112] like Figure 5 As shown, in some embodiments, a first adhesive layer 71 is provided between the battery module and the wall surface of the housing 5.

[0113] Understandably, after the potting compound between the battery module and the wall of the housing 5 solidifies, it can form the first adhesive layer 71, thereby enabling the battery module to be reliably fixed inside the housing 5.

[0114] Please continue reading. Figure 5 In some embodiments, a second adhesive layer 72 is provided between each pair of adjacent individual cells 1. The second adhesive layer 72 is located outside the separator 2 and is connected to the first adhesive layer 71.

[0115] It is understandable that after the potting compound flows between two adjacent individual cells 1 and solidifies, it can form a second adhesive layer 72. The second adhesive layer 72 is integrally formed with the first adhesive layer 71. On the one hand, it can make the connection between individual cells 1 more reliable, and on the other hand, it can improve the bonding strength between individual cells 1 and the housing 5, ensuring that the battery module can be reliably fixed in the housing 5.

[0116] It should be noted that, due to the isolation provided by the separator 2, the second adhesive layer 72 can only flow to the area outside the separator 2 between two adjacent individual cells 1. The area inside the separator 2 is the expansion gap 4 between two adjacent individual cells 1.

[0117] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A battery module, characterized in that, include: A battery cell assembly includes at least two spaced-apart individual battery cells, with an expansion gap formed between each pair of adjacent individual battery cells. An isolation element is provided between each pair of adjacent individual cells, wherein the isolation element is configured as an annular element and is annularly disposed in the expansion gap; A connector is wound around the battery cell assembly.

2. The battery module according to claim 1, characterized in that, The single battery cell includes: case; An electrode assembly is disposed within the housing, the electrode assembly having an expansion region, and the expansion gap corresponding to the expansion region; The isolation element is connected to the outside of the housing and is disposed away from the expansion area of ​​the electrode assembly.

3. The battery module according to claim 2, characterized in that, The isolation component includes a first isolation part and a second isolation part, wherein the first isolation part and the second isolation part are connected end-to-end or are spaced apart end-to-end.

4. The battery module according to claim 3, characterized in that, The electrode assembly includes a main body segment and a first coiled segment located at a first end of the main body segment, wherein the first isolation portion includes a first isolation segment, which is disposed near the interface between the main body segment and the first coiled segment.

5. The battery module according to claim 4, characterized in that, The main body segment includes an expansion region and a connecting region surrounding the expansion region, wherein the orthographic projection of the first isolation segment is at least partially located within the connecting region.

6. The battery module according to claim 4, characterized in that, The electrode assembly further includes a first electrode tab connected to the main body segment. The first isolation portion further includes a third isolation segment, which is angled to the first isolation segment. The orthographic projection of the third isolation segment is at least partially located within the first electrode tab.

7. The battery module according to claim 6, characterized in that, The electrode assembly further includes a second coiled segment located at the second end of the main body segment, wherein the second isolation portion includes a second isolation segment, the first isolation segment and the second isolation segment are spaced apart, and the second isolation segment is located near the interface between the main body segment and the second coiled segment.

8. The battery module according to claim 7, characterized in that, The main body segment includes an expansion region and a connecting region surrounding the expansion region, and the orthographic projection of the second isolation segment is at least partially located within the connecting region.

9. The battery module according to claim 7, characterized in that, The electrode assembly further includes a second tab, which is connected to the side of the main body segment away from the first tab. The second isolation portion further includes a fourth isolation segment, which is angled to the second isolation segment and spaced apart from the third isolation segment. The orthographic projection of the fourth isolation segment is at least partially located within the second tab.

10. The battery module according to any one of claims 1 to 9, characterized in that, The connector is a flexible connector.

11. A battery pack, characterized in that, include: Box; The battery module as described in any one of claims 1 to 10; The battery module is housed within the casing.

12. The battery pack according to claim 11, characterized in that, The connector is provided with a flexible component, which abuts against the side wall of the housing.

13. The battery pack according to claim 12, characterized in that, The flexible component is interference-fitted with the side wall of the housing.

14. The battery pack according to claim 12, characterized in that, The flexible component is configured as a ring.

15. The battery pack according to claim 11, characterized in that, The box body has a protruding part on its wall surface, and the protruding part abuts against the battery module.

16. The battery pack according to any one of claims 11 to 15, characterized in that, A first adhesive layer is provided between the battery module and the wall of the housing.

17. The battery pack according to claim 16, characterized in that, A second adhesive layer is provided between each pair of adjacent individual cells. The second adhesive layer is located outside the separator and is connected to the first adhesive layer.

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