Battery pack

Abstract

The utility model provides a battery pack, and relates to the technical field of batteries. The battery pack comprises a shell, a battery cell stacking body and an insulating filling part, the battery cell stacking body is formed by stacking a plurality of soft package battery cells, and the soft package battery cells are adhered through the adhesive layers, so that the adjacent soft package battery cells can be fixed, and the overall structure of the battery cell stacking body is relatively stable and reliable, and therefore, the battery cell stacking body can be moved and processed. The battery core stacking body is directly arranged in the shell, and the space between the tab part of the soft package battery core and the edge beam is filled with the insulating filling part, so that the battery core stacking body can be relatively stably and reliably fixed in the shell, and the battery core stacking body can be prevented from shaking in the shell. Therefore, the battery pack provided by the utility model is stable and reliable in structure under the condition that a bracket structure for fixing the battery cell stack body is not additionally arranged in the shell, so that the weight and the preparation cost of the battery pack can be reduced.

Description

Technical Field

[0001] The present application relates to a battery pack, and belongs to the technical field of batteries. Background Art

[0002] A soft-pack CTP battery pack is a battery pack structure that directly integrates a battery stack consisting of multiple battery cells into the battery pack shell. In this structure, some frame structures that support the battery cells can be omitted, so that the space in the shell can be effectively utilized, so that the space for setting battery cells in the shell is larger, thereby making the soft-pack CTP battery pack have a higher capacity.

[0003] Due to the omission of some frame structures, multiple cells in the soft-pack CTP battery pack cannot be relatively fixed, making the cell stack structure unstable and resulting in the problem of inconvenient transfer of the cell stack during the preparation process. Utility Model Content

[0004] The present application provides a battery pack, which solves the problem of structural instability of a battery cell stack in the related art.

[0005] The present application provides a battery pack, comprising:

[0006] The housing comprises a tray and an upper cover, wherein the tray comprises a bottom plate and side beams, wherein the side beams are arranged at the edge of the bottom plate along the circumference of the bottom plate, the upper cover is opposite to the bottom plate, and the upper cover is connected to the side beams;

[0007] A battery cell stack, comprising a plurality of soft-pack battery cells and an adhesive layer, wherein the plurality of soft-pack battery cells are arranged on the bottom plate along the thickness direction of the soft-pack battery cells, and the plurality of soft-pack battery cells are electrically connected, and the soft-pack battery cells have ear portions on opposite sides thereof, and the adhesive layer is arranged between adjacent soft-pack battery cells, and the adjacent soft-pack battery cells are bonded by the adhesive layer;

[0008] The insulating filling portion is filled between the pole ear portion and the side beam.

[0009] In some embodiments, the battery cell stack further includes a separator, which is disposed between adjacent soft-pack battery cells, and opposite sides of the separator are connected to the soft-pack battery cells through the adhesive layer.

[0010] In some embodiments, the separator is an elastic structural member, and / or the separator is a heat-insulating structural member.

[0011] In some embodiments, the separator includes an elastic portion and a heat insulating portion connected to each other.

[0012] In some embodiments, the elastic part is a foam part, the heat insulating part is a mica part, and the elastic part is bonded to the heat insulating part.

[0013] In some embodiments, the soft-pack battery core has a bonding surface bonded to the adhesive layer, and a projection area formed by the adhesive layer on the bonding surface has an area not less than 60% of an area of ​​the bonding surface.

[0014] In some embodiments, the thickness of the adhesive layer is 0.05 mm-0.1 mm.

[0015] In some embodiments, the shear strength of adjacent soft-pack battery cells is not less than 0.3 MPa.

[0016] In some embodiments, the adhesive layer includes a plurality of sub-adhesive layer portions, and the plurality of sub-adhesive layer portions are arranged at intervals on the adhesive surface.

[0017] In some embodiments, a thermally conductive adhesive layer is further included, wherein the thermally conductive adhesive layer is disposed between the battery cell stack and the bottom plate, and the thermally conductive adhesive layer is bonded to the battery cell stack and the bottom plate.

[0018] In some embodiments, the insulating filling part is foamed glue.

[0019] In some embodiments, a partition is disposed in the housing, there are a plurality of battery cell stacks, and the partition is disposed between adjacent battery cell stacks.

[0020] In the battery pack provided by the present application, the shell of the battery pack is formed by connecting the bottom plate, the side beam and the upper cover, so that the structure of the shell is compact, and the side beam can support the bottom plate and the upper cover, so that the shell has better structural strength. The battery cell stack is formed by stacking a plurality of soft-pack batteries, and the soft-pack batteries are bonded by an adhesive layer so that adjacent soft-pack batteries can be fixed, so that the overall structural rigidity of the battery cell stack is better, and it is relatively more stable and reliable, so that the battery cell stack can still maintain a stable structure during the movement of the battery cell stack. The battery cell stack is directly arranged in the shell, and the insulating filling part is filled in the space between the pole ear part and the side beam of the soft-pack battery, so that there is no gap between the side beam and the pole ear part of the battery cell stack, so that the battery cell stack can be fixed in the shell more stably and reliably, and the battery cell stack can be prevented from shaking in the shell. In the case where no additional bracket structure for fixing the battery cell stack is provided in the shell, the structure of the battery pack of the present application is stable and reliable, thereby reducing the weight and preparation cost of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other purposes, features and advantages of the embodiments of the present application will become more easily understood through the following detailed description with reference to the accompanying drawings. In the accompanying drawings, multiple embodiments of the present application will be described in an exemplary and non-limiting manner, wherein:

[0022] Figure 1 A schematic diagram of a battery pack according to an embodiment of the present application;

[0023] Figure 2 A schematic diagram of a battery cell stack of a battery pack according to an embodiment of the present application;

[0024] Figure 3 for Figure 2 A schematic diagram showing the enlarged display of the middle A area;

[0025] Figure 4 A schematic diagram of a first structure of a separator of a battery pack according to an embodiment of the present application;

[0026] Figure 5 A schematic diagram of a second structure of a separator of a battery pack according to an embodiment of the present application;

[0027] Figure 6 A schematic diagram of a third structure of a separator of a battery pack according to an embodiment of the present application;

[0028] Figure 7 A schematic diagram of a structure of an adhesive layer of a battery pack according to an embodiment of the present application;

[0029] Figure 8 A schematic diagram of another structure of the adhesive layer of the battery pack according to an embodiment of the present application.

[0030] Reference numerals:

[0031] 10-Battery Pack,

[0032] 100-shell, 101-tray, 110-bottom plate, 111-cavity, 111a-sub-cavity, 120-upper cover, 130-side beam, 140-partition plate,

[0033] 200-battery cell stack, 210-soft-pack battery cell, 211-ear portion, 220-adhesive layer, 221-sub-adhesive layer portion, 230-separator, 231-elastic portion, 232-insulating portion, 240-bonding surface,

[0034] 300-insulation filling part,

[0035] 400-Thermal conductive adhesive layer. DETAILED DESCRIPTION

[0036] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0037] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0039] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0041] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0042] A soft-pack CTP battery pack is a battery pack structure that directly integrates a battery stack consisting of multiple battery cells into the battery pack shell. In this structure, some frame structures that support the battery cells can be omitted, so that the space in the shell can be effectively utilized, so that the space for setting battery cells in the shell is larger, thereby making the soft-pack CTP battery pack have a higher capacity.

[0043] Due to the omission of some frame structures, multiple cells in the soft-pack CTP battery pack cannot be relatively fixed, making the cell stack structure unstable and resulting in the problem of inconvenient transfer of the cell stack during the preparation process.

[0044] In the battery pack provided by the present application, the shell of the battery pack is formed by connecting the bottom plate, the side beam and the upper cover, so that the structure of the shell is compact, and the side beam can support the bottom plate and the upper cover, so that the shell has better structural strength. The battery cell stack is formed by stacking a plurality of soft-pack batteries, and the soft-pack batteries are bonded by an adhesive layer so that adjacent soft-pack batteries can be fixed, so that the overall structural rigidity of the battery cell stack is better, and it is relatively more stable and reliable, so that the battery cell stack can still maintain a stable structure during the movement of the battery cell stack. The battery cell stack is directly arranged in the shell, and the insulating filling part is filled in the space between the pole ear part and the side beam of the soft-pack battery, so that there is no gap between the side beam and the pole ear part of the battery cell stack, so that the battery cell stack can be fixed in the shell more stably and reliably, and the battery cell stack can be prevented from shaking in the shell. In the case where no additional bracket structure for fixing the battery cell stack is provided in the shell, the structure of the battery pack of the present application is stable and reliable, thereby reducing the weight and preparation cost of the battery pack.

[0045] The battery pack provided in this application is described in detail below in conjunction with specific embodiments.

[0046] refer to Figures 1 to 3As shown, the embodiment of the present application provides a battery pack 10, including a housing 100, a battery cell stack 200 and an insulating filling portion 300. The battery pack 10 can be used as a power battery in a car or in other electrical devices, which is not limited by the present application.

[0047] Among them, the shell 100 is the basic component of the battery pack 10 of the present application. The shell 100 can provide a mounting base for at least some of the other components of the battery pack 10 and protect at least some of the other components. The shell 100 can be made of metal material, so that the shell 100 has better structural strength, thereby making the durability and reliability of the shell 100 better. The shell 100 has a cavity 111, and the cavity 111 in the shell 100 can be used to install at least some of the other components of the battery pack 10. The shell 100 includes a tray and an upper cover 120, wherein the tray includes a bottom plate 110 and a side beam 130. The bottom plate 110 is a plate-like structural member, and the side beam 130 is arranged at the edge of the bottom plate 110 along the axial direction of the bottom plate 110. The upper cover 120 is arranged opposite to the bottom plate 110, and the upper cover 120 is connected to the side beam 130, so that the side beam 130 can be supported on the upper cover 120. The bottom plate 110 , the side beams 130 and the upper cover 120 may surround and form a cavity 111 of the housing 100 .

[0048] The cell stack 200 is disposed in the cavity 111 of the housing 100. Specifically, the cell stack 200 can be placed on the bottom plate 110 so that the bottom plate 110 can be supported on the cell stack 200. The upper cover 120 is opposite to the bottom plate 110, so that the upper cover 120 and the bottom plate 110 can limit the cell stack 200 in the height direction of the cell stack 200 to prevent the cell stack 200 from shaking in the height direction. The side beam 130 can limit the cell stack 200 in the horizontal direction, so that the cell stack 200 can be limited in all directions when it is disposed in the housing 100, so that the cell stack 200 remains stable.

[0049] The battery cell stack 200 includes a plurality of soft-pack battery cells 210 and an adhesive layer 220. The plurality of soft-pack battery cells 210 can be stacked on the bottom plate 110 along the thickness direction of the soft-pack battery cells 210. The plurality of soft-pack battery cells 210 are electrically connected so that the plurality of soft-pack battery cells 210 can output electrical energy at the same time. The plurality of soft-pack battery cells 210 are stacked along the thickness direction of the soft-pack battery cells 210, so that the structure of the battery cell stack 200 can be relatively more compact. The adhesive layer 220 is disposed between adjacent soft-pack battery cells 210, and the opposite sides of the adhesive layer 220 are respectively bonded and connected to the adjacent soft-pack battery cells 210, so that the adjacent soft-pack battery cells 210 can be fixed by the adhesive layer 220, so that the plurality of soft-pack battery cells 210 can be relatively fixed to form a battery cell stack 200 with a stable and reliable overall structure, so that the overall rigidity of the battery cell stack 200 is better. The soft-pack battery cell 210 is fixed by the adhesive layer 220 , so that it is not necessary to fix the soft-pack battery cell 210 by other frame structures, so that the structure of the battery cell stack 200 is relatively more compact and the weight is relatively lighter.

[0050] The soft-pack battery cell 210 also has a pole ear portion 211, and the pole ear portions 211 of multiple soft-pack battery cells 210 are connected, so that the multiple soft-pack battery cells 210 can be electrically connected. The number of pole ear portions 211 of the soft-pack battery cell 210 is at least two, and at least two pole ear portions 211 are arranged on opposite sides of the soft-pack battery cell 210, and the pole ear portions 211 face the side beam 130 of the shell 100. The insulating filling portion 300 is filled and arranged between the pole ear portion 211 and the side beam 130, so that the gap space between the pole ear portion 211 and the side beam 130 can be occupied by the insulating filling portion 300, so that the battery cell stack 200 can be relatively more stably arranged in the shell 100. The insulating filling portion 300 can also prevent the pole ear portion 211 from contacting the side beam 130 to prevent the soft-pack battery cell 210 from short-circuiting, making the battery pack 10 of the present application safer and more reliable.

[0051] When preparing the battery pack 10 of the present application, a plurality of soft-packed cells 210 can be bonded and connected through the adhesive layer 220 to form a cell stack 200, and then the cell stack 200 can be installed in the housing 100. In this way, during the movement of the cell stack 200, the overall structure of the cell stack 200 can be kept stable, and some soft-packed cells 210 can be prevented from easily falling off and separating due to their own gravity, thereby improving the preparation efficiency of the battery pack 10 of the present application.

[0052] In some embodiments, reference Figures 1 to 3As shown, the cell stack 200 of the battery pack 10 of the present application may also be provided with a separator 230, which is provided between adjacent soft-pack cells 210. The separator 230 may separate adjacent soft-pack cells 210 to prevent multiple soft-pack cells 210 from directly contacting and affecting each other. The separator 230 may be fixedly connected to the soft-pack cells 210 through an adhesive layer 220. Specifically, an adhesive layer 220 may be provided on both opposite sides of the separator 230, and the opposite sides of the separator 230 may be respectively bonded and connected to adjacent soft-pack cells 210 through the adhesive layer 220, so that the separator 230 is fixed between adjacent soft-pack cells 210. In addition, the separator 230 may also play a role in supporting adjacent soft-pack cells 210 to a certain extent, so that the overall structural rigidity of the cell stack 200 is further improved.

[0053] The separator 230 may specifically be a deformable structural member, so that the separator 230 may be deformed under stress. It should be understood that the volume of the soft-pack battery cell 210 will change accordingly during the charging and discharging process, so that the soft-pack battery cell 210 will expand and contract. When the soft-pack battery cell 210 expands and deforms, the separator 230 may be squeezed, so that the separator 230 is deformed under stress, so that there is space between adjacent soft-pack battery cells 210 for the soft-pack battery cells 210 to release the expansion deformation, thereby preventing the soft-pack battery cells 210 from being squeezed against each other and damaged during the expansion deformation process.

[0054] The separator 230 may also be an elastic structural member, so that the separator 230 can return to its original shape after the deformation due to force ends. When the soft-pack battery cell 210 expands and deforms, the separator 230 can be squeezed, so that the separator 230 is deformed due to force, so that there is space between adjacent soft-pack battery cells 210 for the soft-pack battery cells 210 to release the expansion deformation, thereby preventing the soft-pack battery cells 210 from being squeezed against each other and damaged during the expansion deformation process. When the soft-pack battery cell 210 shrinks from the expansion deformation state to the normal state, the force exerted by the soft-pack battery cell 210 on the separator 230 is reduced, and the separator 230 can be deformed again under the action of its own elastic restoring force, so that the separator 230 can always be close to the soft-pack battery cell 210, so that the structure of the battery cell stack 200 can always remain stable.

[0055] The separator 230 may also be a heat-insulating structural member, so that the separator 230 can prevent the heat of adjacent soft-packed cells 210 from being transferred to each other, thereby protecting the soft-packed cells 210. Specifically, even if some of the soft-packed cells 210 have an overheating failure, the separator 230 can isolate the heat of the failed soft-packed cells 210, thereby preventing the heat of the failed soft-packed cells 210 from being transferred to other soft-packed cells 210 and causing damage to other soft-packed cells 210.

[0056] In some embodiments, reference Figure 3 and Figure 4 As shown, in order to make the separator 230 of the present application both an elastic structural member and a heat-insulating structural member, the separator 230 can be configured to include an elastic portion 231 and a heat-insulating portion 232. Among them, the elastic portion 231 and the heat-insulating portion 232 are connected and arranged so that the separator 230 can be both deformable and heat-insulated. Specifically, the elastic portion 231 and the heat-insulating portion 232 can both be sheet structural members, and the side walls of the elastic portion 231 and the heat-insulating portion 232 with relatively large areas are arranged in affixed manner, so that the elastic portion 231 and the heat-insulating portion 232 can be fixed. The sizes of the heat-insulating portion 232 and the elastic portion 231 can be set to be consistent, so that the structure of the separator 230 is more regular. The heat-insulating portion 232 and the elastic portion 231 can also be connected by bonding, so that the connection effect between the heat-insulating portion 232 and the elastic portion 231 is relatively more stable and reliable. Therefore, when preparing the separator 230, the insulation part 232 and the elastic part 231 can be prepared separately, and then the insulation part 232 and the elastic part 231 can be fixed by bonding to form a whole, thereby reducing the difficulty of preparing the separator 230 and reducing the preparation cost of the battery pack 10 of the present application.

[0057] In addition, reference Figure 4 In other embodiments, the number of the heat insulating parts 232 can also be set to two, and the two heat insulating parts 232 can be arranged on opposite sides of the elastic part 231, so that the two heat insulating parts 232 can be respectively attached to two adjacent soft-pack battery cells 210, so that the two heat insulating parts 232 can better separate the heat of adjacent soft-pack battery cells 210 and prevent multiple soft-pack battery cells 210 from conducting heat to each other.

[0058] Of course, reference Figure 5 , the number of elastic parts 231 can also be set to two, and the two elastic parts 231 can be set on the opposite sides of the heat insulation part 232, so that the two elastic parts 231 can be respectively fitted with two adjacent soft-pack battery cells 210. In this way, the separator 230 can be deformed to a greater extent, so that the separator 230 can provide a larger space for the soft-pack battery cell 210 to release expansion and deformation, so as to better protect the soft-pack battery cell 210. Alternatively, the number of elastic parts 231 and heat insulation parts 232 is set to multiple, and multiple elastic parts 231 and multiple heat insulation parts 232 can be stacked in the thickness direction, so that the separator 230 has better heat insulation performance and larger deformation space.

[0059] In some embodiments, the elastic part 231 may be made of a foam member, which is elastic and relatively soft, so that when the elastic part 231 contacts the soft-pack battery cell 210, the elastic part 231 can avoid damaging the surface of the soft-pack battery cell 210. The heat insulating part 232 may be made of a mica member, which has a relatively low preparation cost and has better heat insulating properties. The number of elastic parts 231 is set to two, and the two elastic parts 231 cover the heat insulating part 232, so that the two elastic parts 231 contact the adjacent soft-pack battery cells 210, which can better protect the soft-pack battery cells 210.

[0060] In some embodiments, reference Figure 7 As shown, the soft-pack battery cell 210 of the present application is provided with a bonding surface 240, and the bonding surfaces 240 of adjacent soft-pack battery cells 210 are arranged opposite to each other, and the adhesive layer 220 is bonded to the bonding surface 240 of the soft-pack battery cell 210. Correspondingly, the separator 230 is also arranged between the bonding surfaces 240 of adjacent soft-pack battery cells 210. When the adhesive layer 220 is bonded to the bonding surface 240 of the soft-pack battery cell 210, a projection area can be formed on the bonding surface 240, and the area of ​​the projection area is not less than 60% of the area of ​​the bonding surface 240, so that the bonding area between the adhesive layer 220 and the soft-pack battery cell 210 can be relatively large, so that the effect of bonding and fixing the adjacent soft-pack battery cells 210 through the adhesive layer 220 is more stable and reliable.

[0061] The thickness of the adhesive layer 220 can be set between 0.0mm-0.1mm, so that the adhesive layer 220 has a certain thickness so that the bonding and fixing effect of adjacent soft-pack battery cells 210 is more stable and reliable. At the same time, the thickness of the adhesive layer 220 will not be too large, so that the structure of the battery cell stack 200 is relatively more compact.

[0062] In some embodiments, the shear strength between adjacent soft-packed cells 210 in the cell stack 200 is not less than 0.3 MPa, which can make the bonding effect of adjacent soft-packed cells 210 more stable and reliable, and prevent some soft-packed cells 210 from falling off and separating during the movement of the cell stack 200.

[0063] In some embodiments, reference Figure 8As shown, the adhesive layer 220 of the present application can be configured to include a plurality of sub-adhesive layer portions 221, and the plurality of sub-adhesive layer portions 221 can be arranged at intervals on the adhesive surface 240 of the soft-pack battery cell 210, and the plurality of sub-adhesive layer portions 221 can be bonded to the adhesive surface 240 of the soft-pack battery cell 210, so that the bonding and fixing effect of adjacent soft-pack battery cells 210 is more stable and reliable. Specifically, the plurality of sub-adhesive layer portions 221 are all strip-shaped structural members, and the plurality of sub-adhesive layer portions 221 can be arranged on the adhesive surface 240 of the soft-pack battery cell 210 in parallel with each other, so that the arrangement of the plurality of sub-adhesive layer portions 221 is more regular, thereby making the bonding effect between the adhesive layer 220 and the soft-pack battery cell 210 more stable and reliable. In addition, in other embodiments, the adhesive layer 220 can also fill the adhesive surface 240 of the soft-pack battery cell 210, which can further improve the connection reliability of adjacent soft-pack battery cells 210.

[0064] In some embodiments, reference Figure 1 As shown, the battery of the present application may also be provided with a thermally conductive adhesive layer 400. The thermally conductive adhesive layer 400 is provided between the bottom plate 110 of the housing 100 and the battery cell stack 200, and the battery cell stack 200 is bonded to the bottom plate 110 through the thermally conductive adhesive layer 400, so that the battery cell stack 200 can be fixed in the housing 100. In this way, there is no need to provide other fixed frame structures in the housing 100 for fixing the battery cell stack 200, so that the structure of the battery pack 10 of the present application is relatively more compact, and the weight of the battery pack 10 can be effectively reduced.

[0065] The thermally conductive adhesive layer 400 also has thermal conductivity, so that the heat generated by the battery cell stack 200 during operation can be conducted to the bottom plate 110 through the thermally conductive adhesive layer 400, and then conducted to the side beams 130 and the upper cover 120. The heat generated by the battery cell stack 200 can be dissipated to the outside through the bottom plate 110, the side beams 130 and the upper cover 120, so that the battery cell stack 200 can be fully dissipated to reduce the heat of the battery cell stack 200.

[0066] The thermal conductive adhesive layer 400 can be laid flat on the bottom plate 110 of the housing 100, so that all parts of the bottom of the battery cell stack 200 can be bonded to the bottom plate 110 through the thermal conductive adhesive layer 400, thereby making the bonding effect between the battery cell stack 200 and the bottom plate 110 more stable and reliable. In addition, the heat generated by the battery cell stack 200 can also be more efficiently conducted to the bottom plate 110.

[0067] In some embodiments, the insulating filling part 300 of the present application may be made of foam. Specifically, when preparing the battery pack 10 of the present application, after the battery cell stack 200 is installed on the bottom plate 110, the foam can be injected and filled into the gap between the pole ear 211 and the side beam 130, so that the insulating filling part 300 can be more fully filled in the gap between the pole ear 211 and the side beam 130. The cost of foam is also relatively low, which can also reduce the preparation cost of the battery pack 10 of the present application.

[0068] In some embodiments, reference Figure 1 As shown, the housing 100 of the present application may also be provided with a partition 140. Among them, the partition 140 may be arranged inside the housing 100, and the partition 140 may divide the internal space of the housing 100 into a plurality of relatively small spaces. Specifically, the partition 140 is arranged in the cavity 111 of the housing 100 to divide the cavity 111 into a plurality of sub-cavities 111a. The number of battery cell stacks 200 may be set to be multiple, and the plurality of battery cell stacks 200 may also be electrically connected, specifically connected in series. The plurality of battery cell stacks 200 may be respectively arranged in a plurality of sub-cavities 111a, so that the partition 230 may separate the plurality of battery cell stacks 200, so that the side walls of the soft-pack batteries 210 of the plurality of battery cell stacks 200 are in direct contact to avoid the plurality of battery cell stacks 200 from affecting each other.

[0069] The side wall of the battery cell stack 200 which faces away from the side beam 130 and is provided with the pole ear portion 211 can also be arranged to be opposite to the partition 140, and an insulating filling portion 300 is arranged between the pole ear portion 2100 and the partition 140, so that the partition 140 can also serve the purpose of limiting the battery cell stack 200, so that multiple battery cell stacks 200 can maintain a stable state when arranged in the shell 100, and at the same time can also serve the purpose of protecting the pole ear portion 211.

[0070] Finally, it should be noted that the above implementation modes are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned implementation modes, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned implementation modes can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the implementation modes of the present application.

Claims

1. A battery pack, characterized in that: include: A housing (100) comprises a tray and an upper cover (120), wherein the tray comprises a bottom plate (110) and a side beam (130), wherein the side beam (130) is arranged at the edge of the bottom plate (110) along the circumference of the bottom plate (110), the upper cover (120) is opposite to the bottom plate (110), and the upper cover (120) is connected to the side beam (130); A battery cell stack (200) comprises a plurality of soft-package battery cells (210) and an adhesive layer (220), wherein the plurality of soft-package battery cells (210) are arranged on the bottom plate (110) along the thickness direction of the soft-package battery cells (210), and the plurality of soft-package battery cells (210) are electrically connected, and the soft-package battery cells (210) have pole ears (211) on opposite sides, and the adhesive layer (220) is arranged between adjacent soft-package battery cells (210), and the adjacent soft-package battery cells (210) are bonded by the adhesive layer (220); An insulating filling portion (300) is filled between the pole ear portion (211) and the side beam (130).

2. The battery pack according to claim 1, characterized in that: The battery cell stack (200) further comprises a separator (230), wherein the separator (230) is arranged between adjacent soft-package battery cells (210), and opposite sides of the separator (230) are connected to the soft-package battery cells (210) via the adhesive layer (220).

3. The battery pack according to claim 2, characterized in that: The partition (230) is an elastic structural member, and / or the partition (230) is a heat-insulating structural member.

4. The battery pack according to claim 3, characterized in that: The separator (230) comprises an elastic portion (231) and a heat insulating portion (232) which are connected to each other.

5. The battery pack according to claim 4, characterized in that: The elastic part (231) is a foam part, the heat insulating part (232) is a mica part, and the elastic part (231) and the heat insulating part (232) are bonded and connected.

6. The battery pack according to any one of claims 1 to 5, characterized in that: The soft-package battery core (210) has a bonding surface (240) bonded to the adhesive layer (220), and a projection area formed by the adhesive layer (220) on the bonding surface (240), the area of ​​the projection area being not less than 60% of the area of ​​the bonding surface (240).

7. The battery pack according to claim 6, characterized in that: The thickness of the adhesive layer (220) is 0.05 mm-0.1 mm.

8. The battery pack according to claim 7, characterized in that: The shear strength of adjacent soft-package battery cells (210) is not less than 0.3 Mpa.

9. The battery pack according to claim 6, characterized in that: The adhesive layer (220) comprises a plurality of sub-adhesive layer portions (221), and the plurality of sub-adhesive layer portions (221) are arranged at intervals on the adhesive surface (240).

10. The battery pack according to any one of claims 1 to 5, characterized in that: It also includes a thermally conductive adhesive layer (400), which is arranged between the battery cell stack (200) and the bottom plate (110), and the thermally conductive adhesive layer (400) is bonded to the battery cell stack (200) and the bottom plate (110).

11. The battery pack according to any one of claims 1 to 5, characterized in that: The insulating filling part (300) is foamed rubber.

12. The battery pack according to any one of claims 1 to 5, characterized in that: A partition (140) is arranged in the housing (100), the number of the battery cell stacks (200) is plural, and the partition (140) is arranged between adjacent battery cell stacks (200).

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