Battery pack and electric device

Abstract

The utility model relates to a battery pack and a power utilization device. The battery pack comprises a battery pack shell, a battery module, filling glue and a first shielding structure, a shell cavity is formed in the battery pack shell, and the battery module is arranged in the shell cavity; the filling glue is filled in the shell cavity and covers the battery module; wherein the battery module comprises at least two battery monomers, and the at least two battery monomers are arranged at intervals to form an expansion space; the first shielding structure at least partially blocks the expansion space so as to at least partially block the filling glue from entering the expansion space. The first shielding structure is arranged to at least partially block the expansion space, so that the filling glue can be effectively reduced or prevented from entering the expansion space between the battery monomers, and further the adhesion between the battery monomers through the filling glue can be reduced or prevented; and the adhesive force needing to be overcome can be effectively reduced, so that the service life of the battery monomer is prolonged.

Description

Technical Field

[0001] This disclosure relates to the field of battery pack technology, and more specifically, to a battery pack and an electrical device. Background Technology

[0002] To improve production efficiency and optimize costs, battery pack production is becoming increasingly simplified, and the use of potting compound for battery pack assembly is becoming a trend. However, some problems also exist in the application process.

[0003] In related technologies, during the entire life cycle of a battery pack, individual battery cells expand with charge and discharge cycles. In potting compound battery packs, the position of individual battery cells is fixed by the potting compound. The tendency of individual battery cells to increase in volume will cause forces to act on the individual battery cells, thereby shortening the life of the battery pack. Utility Model Content

[0004] To overcome the problems existing in the related technologies, this disclosure provides a battery pack and an electrical device to solve the technical problems existing in the related technologies.

[0005] According to an embodiment of this disclosure, a battery pack is provided, the battery pack including a battery pack housing, a battery module, a filler adhesive, and a first shielding structure;

[0006] The battery pack housing has a cavity inside, and the battery module is disposed within the cavity.

[0007] The filler adhesive fills the cavity of the housing and covers the battery module;

[0008] The battery module includes at least two battery cells, which are spaced apart to form an expansion space; the first shielding structure at least partially blocks the expansion space to at least partially prevent the filler adhesive from entering the expansion space.

[0009] In some embodiments, a space is formed between the battery pack housing and the battery module to form a filling space, the filling adhesive is filled in the filling space, and the expansion space has an opening communicating with the filling space;

[0010] The first shielding structure is disposed within the filling space and at least partially blocks the opening; and / or, the first shielding structure is compressibly disposed within the expansion space.

[0011] In some embodiments, the battery cell includes a battery body and a terminal post, the terminal post being disposed protrudingly on a first end face of the battery body in a first direction, and the first shielding structure being disposed within the filling space and overlapping the first end face;

[0012] Wherein, the dimension of the pole in the first direction is greater than the dimension of the first shielding structure in the first direction.

[0013] In some embodiments, the first shielding structure is disposed within the filling space, and a first side of the first shielding structure overlaps one of the two spaced-apart battery cells, and a second side of the first shielding structure overlaps the other of the two spaced-apart battery cells.

[0014] In some embodiments, the battery cells are arranged along a second direction, and at least two battery cells are spaced apart to form the expansion space; wherein the second direction is configured as the thickness direction of the battery cells.

[0015] In some embodiments, the battery module includes at least two first battery packs arranged in a third direction, each first battery pack including at least two battery cells arranged in a second direction, and the first battery pack forming at least one expansion space; wherein the second direction intersects with the third direction.

[0016] In some embodiments, at least two of the expansion spaces in at least two of the first battery packs are disposed opposite each other in the third direction;

[0017] The first shielding structure includes at least one first shielding member that at least partially blocks at least two of the expansion spaces disposed opposite each other in the third direction.

[0018] In some embodiments, the dimension of the first shielding structure in the second direction is a first dimension, the dimension of the expansion space in the second direction is a second dimension, and the ratio of the first dimension to the second dimension is between 0.025 and 1000.

[0019] In some embodiments, the battery cell includes a first end face, which is opposite to and spaced apart from the cover plate of the battery pack housing in a first direction to define a filling space for the filler adhesive to fill.

[0020] Wherein, the distance between the first end face and the inner wall of the cover plate is the third dimension, the dimension of the expansion space in the first direction is the fourth dimension, and the ratio between the third dimension and the fourth dimension is between 0.15 and 40.

[0021] In some embodiments, the first shielding structure is made of insulating and / or heat-insulating and / or compressible materials.

[0022] In some embodiments, the battery pack further includes a second shielding structure;

[0023] The second shielding structure is compressibly disposed on the sidewall of the battery module and covers at least a portion of the battery cell.

[0024] According to an embodiment of this disclosure, an electrical device is also provided, the electrical device including the battery; wherein the electrical device includes a vehicle.

[0025] The technical solutions provided by the embodiments of this disclosure can include the following beneficial effects: by setting a first shielding structure to at least partially block the expansion space, the amount of filler adhesive entering the expansion space between battery cells can be effectively reduced or avoided, thereby reducing or avoiding bonding between battery cells through filler adhesive. When battery cells expand during charging and discharging, the adhesive force that needs to be overcome can be effectively reduced, thus extending the service life of the battery cells. In addition, the expansion space also provides room for the expansion of battery cells, preventing compression between them.

[0026] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0027] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0028] Figure 1 This is an exploded structural diagram of a battery pack according to one embodiment of the present disclosure.

[0029] Figure 2 This is a schematic cross-sectional view of a battery pack along a second direction, illustrating one embodiment of the present disclosure.

[0030] Figure 3 This is a schematic diagram of a partial cross-sectional structure of a battery pack along a third direction, illustrating one embodiment of the present disclosure.

[0031] Figure 4 This is a partial structural schematic diagram of a battery pack according to one embodiment of the present disclosure.

[0032] Explanation of reference numerals in the attached figures

[0033] 10. Battery pack housing; 11. Housing cavity; 12. Cover plate; 13. Side plate; 14. Bottom plate;

[0034] 2. Battery module; 20. Expansion space; 201. Opening; 21. Battery cell; 211. Battery body; 2110. First end face; 212. Terminal post; 213. First battery pack;

[0035] 3. Filler adhesive; 30. Filler space;

[0036] 4. First shielding structure; 41. First shielding component; 5. Liquid cooling plate; 100. Battery pack;

[0037] a) First dimension; b) Second dimension; c) Third dimension; d) Fourth dimension;

[0038] A. First direction; B. Second direction; C. Third direction. Detailed Implementation

[0039] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0040] In this disclosure, unless otherwise stated, the directional terms "first direction, second direction, and third direction" refer to three intersecting directions. Specifically, the first direction, second direction, and third direction can be perpendicular to each other in pairs, as detailed in the following references. Figure 1 As shown.

[0041] The directional terms used, such as "inner" and "outer", refer to the inner and outer parts of the specific structural outline. The terms used, such as "first" and "second", are only used to distinguish one element from another and do not have any order or importance. In addition, "multiple" in this application refers to two or more and includes two.

[0042] In the description of this disclosure, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" 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 direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0043] Reference Figures 1 to 4As shown, this disclosure provides a battery pack 100, including a battery pack housing 1, a battery module 2, a filler adhesive 3, and a first shielding structure 4. The battery pack housing 1 has a housing cavity 10 formed inside, and the battery module 2 is disposed within the housing cavity 10; the filler adhesive 3 fills the housing cavity 10 and covers the battery module 2; wherein the battery module 2 includes at least two battery cells 21, and the at least two battery cells 21 are spaced apart to form an expansion space 20; the first shielding structure 4 at least partially seals the expansion space 20 to at least partially prevent the filler adhesive 3 from entering the expansion space 20.

[0044] In the above technical solution, by setting the first shielding structure 4 to at least partially block the expansion space 20, the amount of filler adhesive 3 entering the expansion space 20 between the battery cells 21 can be effectively reduced or avoided. This reduces or avoids bonding between the battery cells 21 via the filler adhesive 3. Therefore, when the battery cells 21 expand during charging and discharging, the bonding force that needs to be overcome can be effectively reduced, thereby extending the service life of the battery cells 21. Furthermore, the expansion space 20 also provides space for the expansion of the battery cells 21, preventing compression between them.

[0045] The first shielding structure 4 can be used to seal the expansion space 20 in any appropriate way. For example, the first shielding structure 4 can be set outside the expansion space 20 and restrict the filler adhesive 3 from entering the expansion space 20. Alternatively, the first shielding structure 4 can be set inside the expansion space 20 and can also restrict the filler adhesive 3 from entering the expansion space 20. Or, the first shielding structure 4 can be set both inside and outside the expansion space 20 to more effectively restrict the filler adhesive 3 from entering the expansion space 20.

[0046] In addition, the filler 3 mentioned above can be either foamed or non-foamed, and this disclosure does not limit the specific type of filler; furthermore, as for the potting method of the filler 3, it can be either a partial potting method or a full potting method, and different adhesives can be used in different areas (preferably the same system to avoid chemical reactions), or the same adhesive can be used in different areas, and this disclosure does not limit this either.

[0047] In one implementation, reference is made to Figure 2 As shown, a filling space 30 is formed between the battery pack housing 1 and the battery module 2, and the filling adhesive 3 is filled in the filling space 30. The expansion space 20 has an opening 201 that communicates with the filling space 30. A first shielding structure 4 is disposed in the filling space 30 and at least partially blocks the opening 201. And / or, the first shielding structure 4 is compressibly disposed in the expansion space 20.

[0048] That is, in this embodiment, the first shielding structure 4 can be configured in three ways: 1) The first shielding structure 4 is disposed in the filling space 30, and the first shielding structure 4 at least partially blocks the opening 201, but the first shielding structure 4 is not disposed in the expansion space 20; 2) The first shielding structure 4 is compressibly disposed in the expansion space 20; 3) The first shielding structure 4 is both disposed at the opening 201 and disposed in the expansion space 20. The specific configuration of the first shielding structure 4 is not limited in this disclosure, as long as it can restrict the filling adhesive 3 from entering the expansion space 20.

[0049] When the first blocking structure 4 is disposed at the opening 201, it can partially or completely block the opening 201; this disclosure does not limit this. When the first blocking structure 4 is compressibly disposed within the expansion space 20, it can be a part or all of the space within the expansion space 20; this disclosure does not limit this.

[0050] In addition, the reason why the first shielding structure 4 in the expansion space 20 is set as a compressible structure is mainly because the battery cell 21 will expand during charging and discharging. By setting the first shielding structure 4 as a compressible structure, even if the battery cell 21 expands in the expansion space 20, it can resist the first shielding structure 4 for compression, thereby absorbing the amount of movement of the battery cell 21 during expansion, avoiding affecting the expansion of the battery cell 21, and extending the service life of the battery cell 21.

[0051] In another embodiment, refer to Figure 2 As shown, the battery cell 21 includes a battery body 211 and a terminal post 212. The terminal post 212 is protruding from the first end face 2110 of the battery body 211 in the first direction A. The first shielding structure 4 is disposed in the filling space 30 and overlaps the first end face 2110. The dimension of the terminal post 212 in the first direction A is larger than the dimension of the first shielding structure 4 in the first direction A, so as to avoid the first shielding structure 4 affecting the assembly of the battery module 2 in the first direction A.

[0052] Optionally, refer to Figure 2As shown, the first shielding structure 4 is disposed within the filling space 30, and the first side of the first shielding structure 4 overlaps with one of the two spaced-apart battery cells 21, while the second side of the first shielding structure 4 overlaps with the other of the two spaced-apart battery cells 21. That is, the first shielding structure 4 can completely cover the opening 201 of the expansion space 20, thereby improving the blocking effect of the first shielding structure 4 on the filler adhesive 3. The first shielding structure 4 can overlap with the battery cell 21 in any suitable form; for example, the first shielding structure 4 can be overlapped with the battery cell 21 by adhesive bonding, thereby improving the stability of the overlap.

[0053] In one embodiment, reference is made to... Figure 2 and Figure 4 As shown, the battery cells 21 are arranged along the second direction B, and at least two battery cells 21 are spaced apart to form an expansion space 20; wherein, the second direction B is configured as the thickness direction of the battery cells 21.

[0054] In this embodiment, either some of the battery cells 21 are spaced apart to form an expansion space 20, while other battery cells 21 are attached together; or an expansion space 20 is spaced apart between every two adjacent battery cells 21. This disclosure does not limit this.

[0055] Secondly, since the battery cells 21 are arranged in the direction of their thickness, the expansion space 20 can effectively reserve space for the expansion of the battery cells 21 in the direction of their thickness.

[0056] For example, the battery cell 21 can be constructed as a cuboid battery cell, which has two large faces arranged opposite to each other in the second direction B, and the aforementioned expansion space is provided between the large faces of two adjacent cuboid battery cells.

[0057] Alternatively, the battery cell 21 can be constructed as a cylindrical battery cell, with adjacent cylindrical battery cells spaced apart radially, that is, the thickness direction of the cylindrical battery cell is configured as its radial direction. The aforementioned expansion space is provided between the two curved surfaces of two adjacent cylindrical battery cells. However, this disclosure does not limit the specific shape of the battery cell 21, and it can be constructed in any suitable shape.

[0058] Optionally, refer to Figure 1 As shown, the battery module 2 includes at least two first battery packs 213, which are arranged in a third direction C. Each first battery pack 213 includes at least two battery cells 21 arranged in a second direction B, and the first battery pack 213 forms at least one expansion space 20; wherein the second direction B intersects with the third direction C.

[0059] In this embodiment, some of the battery cells 21 of the first battery pack 213 can be attached together, while other battery cells 21 can be arranged in pairs with spacing between them; alternatively, all the battery cells 21 of the first battery pack 213 can be arranged in pairs with spacing between them, and this disclosure does not limit this arrangement. Furthermore, this disclosure does not limit the specific arrangement of the battery cells 21.

[0060] Furthermore, the second direction B and the third direction C mentioned above can be perpendicular to each other, and this disclosure does not limit this. For example, the battery pack 100 mentioned above can be constructed as a cuboid battery pack, where the second direction B can be the width direction of the cuboid battery pack, and the third direction C can be the length direction of the cuboid battery pack; or, the second direction B can be the length direction of the cuboid battery pack, and the third direction C can be the width direction of the cuboid battery pack, and this disclosure does not limit this.

[0061] Reference Figure 1 As shown, at least two expansion spaces 20 in at least two first battery packs 213 are arranged opposite each other in a third direction C; the first shielding structure 4 includes at least one first shielding member 41, which at least partially blocks the at least two expansion spaces 20 arranged opposite each other in a third direction C.

[0062] That is, the expansion spaces 20 of two or more adjacent first battery packs 213 can be arranged opposite each other on the third direction C. The expansion spaces 20 arranged opposite each other can share a first shield 41 to block the filler 3, reduce the number of first shields 41, and simplify the structural arrangement of the first shield structure 4.

[0063] For example, there can be two first battery packs 213. In each first battery pack 213, there are intervals between every two adjacent battery cells 21. In the second direction B, there can be sequentially spaced first expansion space, second expansion space to Nth expansion space. The two first expansion spaces of the two first battery packs 213 can share a first shielding member 41, the two second expansion spaces of the two first battery packs 213 can share a first shielding member 41, and the two Nth expansion spaces of the two first battery packs 213 can share a first shielding member 41.

[0064] Optionally, refer to Figure 2 As shown, the first shielding structure 4 has a first dimension a in the second direction B, and the expansion space 20 has a second dimension b in the second direction B. The ratio of the first dimension a to the second dimension b is between 0.025 and 1000.

[0065] The ratio of the first dimension a to the second dimension b can be 0.025, or the ratio of the first dimension a to the second dimension b can be 100, or the ratio of the first dimension a to the second dimension b can be 1000, but this disclosure does not limit the ratio of the first dimension a to the second dimension b.

[0066] The reason why the ratio of the first dimension a to the second dimension b is not less than 0.025 is that if the width of the first shielding structure 4 is too small, the effect of absorbing expansion force will be significantly insufficient, and it will be unable to effectively seal the expansion space 20, thus failing to effectively block the filler adhesive. Furthermore, the reason why the ratio of the first dimension a to the second dimension b is not greater than 1000 is that if the width of the first shielding structure 4 is too large, it will affect the bonding area between the battery cell 21 and the filler adhesive 3, thereby reducing the overall modality and strength of the battery pack 100.

[0067] In another embodiment, refer to Figure 2 As shown, the battery cell 21 includes a first end face 2110, which is opposite to and spaced apart from the cover plate 11 of the battery pack housing 1 in the first direction A, thereby defining a filling space 30 for filling with filler 3. The distance between the first end face 2110 and the inner wall of the cover plate 11 is a third dimension c, and the dimension of the expansion space 20 in the first direction A is a fourth dimension d. The ratio between the third dimension c and the fourth dimension d is between 0.15 and 40.

[0068] In this embodiment, the ratio between the third dimension c and the fourth dimension d can be 0.15, or the ratio between the third dimension c and the fourth dimension d can be 10, or the ratio between the third dimension c and the fourth dimension d can be 40. This disclosure does not limit the ratio between the third dimension c and the fourth dimension d.

[0069] If the ratio between the third dimension c and the fourth dimension d is less than 0.15, it means that the height of the expansion space 20 is too high. If it is too high, it will weaken the connection strength between the filler 3 and the battery module 2, reducing the overall mode and strength of the battery pack 100. If the ratio between the third dimension c and the fourth dimension d is greater than 40, it means that the height of the expansion space 20 is too small, and the effect of absorbing expansion force is not obvious.

[0070] The specific structure of the battery pack housing 1 may include a cover plate 11, a side plate 12, and a bottom plate 13. The cover plate 11 and the bottom plate 13 are respectively connected to the opposite sides of the side plate 12 in the first direction A, and together they enclose the housing cavity 10. A liquid cooling plate 5 may also be provided inside the housing cavity 10, and the battery module 2 is disposed on the liquid cooling plate 5 to support and manage the heat of the battery module 2.

[0071] Furthermore, regarding the material of the first shielding structure 4, it can be made of an insulating material, such as plastic or rubber; or it can be made of a compressible material, such as foam; or it can be made of a heat-insulating material, such as foam. Alternatively, the first shielding structure 4 can simultaneously possess the properties of insulation, compressibility, and heat insulation, such as EPDM rubber foam, but this disclosure does not limit the specific material of the first shielding structure 4.

[0072] In another embodiment, the battery pack 100 may further include a second shielding structure (not shown); the second shielding structure is compressibly disposed on the side wall of the battery module 2 and covers at least a portion of the battery cells 21. On the one hand, the second shielding structure can provide good cushioning performance for the battery module 2; on the other hand, the compressibility of the second shielding structure can absorb part of the expansion force of the battery cells 21 of the battery module 2, extending the service life of the battery cells 21. The specific material of the second shielding structure can be the same as that of the first shielding structure 4, and this disclosure does not impose specific limitations.

[0073] This disclosure also provides an electrical device that includes the battery pack 100 described above. The electrical device includes a vehicle, but this disclosure does not limit the specific type of the electrical device. For example, the electrical device may also be a spacecraft or a ship.

[0074] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of this disclosure. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0075] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A battery pack, characterized in that, The battery pack includes a battery pack housing, a battery module, a filler adhesive, and a first shielding structure; The battery pack housing has a cavity inside, and the battery module is disposed within the cavity. The filler adhesive fills the cavity of the housing and covers the battery module; The battery module includes at least two battery cells, which are spaced apart to form an expansion space; the first shielding structure at least partially blocks the expansion space to at least partially prevent the filler adhesive from entering the expansion space.

2. The battery pack according to claim 1, characterized in that, The battery pack housing and the battery module are spaced apart to form a filling space, the filling adhesive is filled in the filling space, and the expansion space has an opening communicating with the filling space; The first shielding structure is disposed within the filling space and at least partially blocks the opening; And / or, the first shielding structure is compressibly disposed within the expansion space.

3. The battery pack according to claim 2, characterized in that, The battery cell includes a battery body and a terminal post. The terminal post protrudes in a first direction and is disposed on a first end face of the battery body. The first shielding structure is disposed in the filling space and overlaps the first end face. Wherein, the dimension of the pole in the first direction is greater than the dimension of the first shielding structure in the first direction.

4. The battery pack according to claim 2, characterized in that, The first shielding structure is disposed within the filling space, and a first side of the first shielding structure overlaps with one of the two spaced-apart battery cells, and a second side of the first shielding structure overlaps with the other of the two spaced-apart battery cells.

5. The battery pack according to claim 1, characterized in that, The battery cells are arranged along a second direction, with at least two battery cells spaced apart to form the expansion space; wherein the second direction is configured as the thickness direction of the battery cells.

6. The battery pack according to claim 5, characterized in that, The battery module includes at least two first battery packs arranged in a third direction. Each first battery pack includes at least two battery cells arranged in a second direction, and the first battery pack forms at least one expansion space. The second direction intersects with the third direction.

7. The battery pack according to claim 6, characterized in that, At least two of the expansion spaces in at least two of the first battery packs are arranged opposite each other in the third direction; The first shielding structure includes at least one first shielding member that at least partially blocks at least two of the expansion spaces disposed opposite each other in the third direction.

8. The battery pack according to claim 5, characterized in that, The first shielding structure has a first dimension in the second direction, and the expansion space has a second dimension in the second direction. The ratio of the first dimension to the second dimension is between 0.025 and 1000.

9. The battery pack according to claim 1, characterized in that, The battery cell includes a first end face, which is opposite to and spaced apart from the cover plate of the battery pack housing in a first direction to define a filling space for the filler adhesive to fill. Wherein, the distance between the first end face and the inner wall of the cover plate is the third dimension, the dimension of the expansion space in the first direction is the fourth dimension, and the ratio between the third dimension and the fourth dimension is between 0.15 and 40.

10. The battery pack according to any one of claims 1-9, characterized in that, The first shielding structure is made of insulating material and / or heat-insulating material and / or compressible material.

11. The battery pack according to any one of claims 1-9, characterized in that, The battery pack also includes a second shielding structure; The second shielding structure is compressibly disposed on the sidewall of the battery module and covers at least a portion of the battery cell.

12. An electrical appliance, characterized in that, The electrical device includes the battery pack according to any one of claims 1-11; wherein the electrical device includes a vehicle.

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