Battery pack and electric device

Abstract

The utility model relates to the technical field of batteries, and discloses a battery pack and an electric device, the battery pack comprises a box body and a cover body, the box body comprises a bottom plate, two first boundary beams and two second boundary beams; the plurality of batteries are arranged along a third direction to form a battery pack; the side plates are arranged between every two adjacent battery packs, filling gaps are formed between the sides, close to the first edge beams, of the battery packs and the first edge beams, at least one end of each side plate is provided with an extending part exceeding the edges of the battery packs, and the extending parts divide the filling gaps into filling subspaces; and the extension part is provided with a glue filling through hole for communicating two adjacent filling subspaces. During glue filling, after flowing into one filling subspace, glue flows from the glue filling through hole to the other filling subspace, so that the flowing of the adhesive tape is accelerated, the filling gap between the battery pack and the first edge beam can be filled with the glue, and the bonding effect and the bonding strength of the battery pack and the first edge beam are enhanced; and the structural strength and the structural stability of the whole battery pack are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, concretely relates to battery pack and electric device. BACKGROUND

[0002] Battery pack refers to the collection of a plurality of batteries, which can achieve higher capacity, better safety and more stable performance. Battery pack is widely used in electric vehicles, energy storage systems, portable electronic products and other fields.

[0003] The battery pack usually includes a box body and batteries, and the battery is the core component of the battery pack, responsible for storing and releasing electrical energy. The battery is arranged in the box body, which can protect the internal components from the external environment, provide mechanical protection and dustproof and waterproof functions.

[0004] Filling glue inside the box body can fix the internal battery. In the process, the battery is installed first, and then the glue is filled. To ensure the overall fixing effect of the glue after filling, the ideal state is that all gaps can be filled with glue. However, in order to ensure the structural strength of the side part of the battery pack, the side plate between the battery packs extends to the gap between the battery packs and the edge beam. When filling glue, the end of the side plate blocks the flow of glue, which makes it difficult for the glue to flow in the gap, and the battery packs and the edge beam cannot be well filled with glue, thereby affecting the overall structural stability, bonding effect and strength. UTILITY MODEL CONTENTS

[0005] Therefore, the utility model provides a battery pack and an electric device to solve the problem that the end of the side plate blocks the flow of glue, causing the battery packs and the edge beam to be unable to be well filled with glue.

[0006] The utility model provides a battery pack, which has a first direction, a second direction and a third direction intersecting with each other, and comprises a box body and a cover body. The box body has a receiving cavity, and the cover body covers and seals the receiving cavity and is connected with the box body. The box body includes a bottom plate, two first edge beams and two second edge beams. The two first edge beams are arranged on the bottom plate in the third direction, and the two second edge beams are arranged on the bottom plate in the second direction. The two first edge beams, the two second edge beams and the bottom plate form the receiving cavity. A plurality of batteries are arranged in the receiving cavity and arranged in the third direction to form a plurality of battery groups. The plurality of battery groups are arranged in the second direction. A plurality of side plates are arranged between two adjacent battery groups in the second direction. There is a filling gap between one side of the plurality of battery groups close to the first edge beam and the first edge beam. In the third direction, at least one end of the side plate is provided with an extension part that exceeds the edge of the battery group. The extension part is connected with the first edge beam close to it. The extension part divides the filling gap into a plurality of filling subspaces. The extension part is provided with a glue filling through hole that communicates with two adjacent filling subspaces.

[0007] Beneficial effects: By creating a potting hole on the extension of the side plate to the filling gap, the glue flows into one filling sub-space and then through the potting hole to another filling sub-space during potting. This accelerates the flow of the glue, ensuring that the filling gap between the battery pack and the first side beam is completely filled with glue. This enhances the bonding effect and strength between the battery pack and the first side beam, thereby improving the structural strength and stability of the entire battery pack. Furthermore, the glue has a certain degree of flexibility, which can absorb vibration to a certain extent, reduce the impact of external impacts on the battery pack, and protect the battery from damage. The glue can also fix the battery position, preventing displacement during use and ensuring a stable and reliable connection.

[0008] In one alternative implementation, the potting through-hole is located close to the base plate in the first direction.

[0009] Beneficial effects: Placing the glue-filling hole close to the base plate facilitates glue flow, increases glue-filling speed, and thus improves glue-filling efficiency.

[0010] In one alternative embodiment, the side plate has a surface facing the base plate, and in a first direction, the ratio of the distance from the center of the potting hole to the surface to the height of the side plate is 1 / 3 to 1 / 2.

[0011] Beneficial effects: Setting the distance from the center of the glue-filling hole to the surface in a ratio of 1 / 3 to 1 / 2 to the height of the side plate facilitates glue flow, resulting in faster glue strip flow and higher glue injection efficiency.

[0012] In one optional embodiment, the glue-filling through-hole is funnel-shaped along the second direction; or, the glue-filling through-hole includes a first funnel segment, a cylindrical segment, and a second funnel segment arranged sequentially along the second direction, with one end of the first funnel segment near the cylindrical segment connected to one end of the cylindrical segment, and the other end of the cylindrical segment connected to one end of the second funnel segment near the cylindrical segment, the aperture of the first funnel segment gradually decreasing along the second direction, and the aperture of the second funnel segment gradually increasing along the second direction.

[0013] Beneficial effects: The funnel-shaped design facilitates unidirectional flow, guiding the glue to flow smoothly, reducing air bubble formation, and ensuring more uniform and dense glue filling. The larger inlet accelerates glue flow, shortens dispensing time, and improves production efficiency. The first funnel section guides the glue to flow smoothly, while the second funnel section guides the glue to flow out, accelerating the glue flow rate.

[0014] In one optional embodiment, there are multiple potting through holes, which are staggered along a first direction.

[0015] Beneficial effects: The multiple glue-filling holes are sloped relative to the height direction, which facilitates unidirectional flow of glue. Unidirectional flow can accelerate the flow of glue, shorten the glue-filling time, and improve production efficiency.

[0016] In one alternative embodiment, the surface of the potting through hole is an arc-shaped surface that arches and curves toward or away from the interior of the potting through hole.

[0017] Beneficial effects: The arc-shaped glue-filling through-hole also facilitates unidirectional flow of glue. Unidirectional flow can accelerate the flow of glue, shorten the glue-filling time, and improve production efficiency.

[0018] In one optional embodiment, there are multiple potting through holes, which are arranged in a straight line, a double-line, an S-shape, or an M-shape.

[0019] Beneficial effects: When multiple glue-filling through-holes are arranged in a straight line, the glue flows along a straight path, which is easy to control and monitor, ensuring uniform glue distribution. The straight path reduces dead zones in glue flow, ensuring that all areas are fully filled, and also facilitates continuous glue flow, reducing air bubble formation. When multiple glue-filling through-holes are arranged in a U-shape, the two parallel rows of through-holes can achieve bidirectional flow, ensuring uniform glue distribution in both directions. It can also achieve multi-path distribution, covering a larger area, reducing unfilled areas, and reducing air bubble formation when glue is injected at a single point, ensuring a denser glue filling. When multiple glue-filling through-holes are arranged in an S-shape, the S-shaped path ensures uniform glue distribution in a tortuous path, reducing local over- or under-thickness. The tortuous path can cover a larger area, ensuring that all corners are fully filled. When multiple glue-filling through-holes are arranged in an M-shape, the M-shaped path can achieve multi-directional flow, ensuring uniform glue distribution in multiple directions. It can also achieve multi-path distribution, covering a larger area, reducing unfilled areas.

[0020] In one alternative embodiment, the side plate has a side surface close to the battery pack, and the contour pattern formed by the potting through holes on the side surface is one or more of polygons, circles, and ellipses.

[0021] Beneficial effects: Polygonal, circular, and elliptical potting holes are easy to process and manufacture, reducing manufacturing difficulty.

[0022] In one alternative embodiment, the portion of the first side beam near the bottom plate forms a protrusion that extends toward the battery pack, and the corner of the side plate near the bottom plate has a clearance opening, into which the protrusion is inserted.

[0023] Beneficial effects: The protrusion can increase the cross-sectional area of ​​the first side beam, improving its bending and shear resistance, thereby enhancing the structural rigidity and stability of the entire battery box. By providing clearance openings at the corners of the side plates near the bottom plate, interference between the side plates and the first side beam can be avoided.

[0024] Secondly, this utility model also provides an electrical device, including the battery pack described above. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a perspective view of a battery pack according to an embodiment of the present utility model;

[0027] Figure 2 for Figure 1 A perspective view of the battery pack housing shown;

[0028] Figure 3 for Figure 2 A magnified view of part A in the diagram;

[0029] Figure 4 for Figure 1 A 3D view of the battery pack without its cover;

[0030] Figure 5 for Figure 4 A magnified view of part B in the diagram;

[0031] Figure 6 for Figure 4 A top view of the battery pack shown;

[0032] Figure 7 for Figure 6 The shown is a cross-sectional view of the battery pack along the CC direction;

[0033] Figure 8 for Figure 7 A schematic diagram of the structure on the right side of the battery pack shown;

[0034] Figure 9 for Figure 6 The diagram shows the structure of the side plate.

[0035] Figure 10 for Figure 9 The diagram shows a cross-sectional view of the side panel along the EE direction.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Box body; 101. Receiving cavity; 102. Base plate; 103. First side beam; 1031. Protrusion; 104. Second side beam;

[0038] 2. Battery;

[0039] 4. Side panel; 401. Extension; 402. Glue-filling through hole; 4021. First funnel section; 4022. Cylindrical section; 4023. Second funnel section; 403. Surface; 404. Side side; 405. Clearance opening;

[0040] 5. Cover;

[0041] 6. Fill the gaps;

[0042] 7. Structural adhesive layer;

[0043] 8. Sealing strip. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0045] The following is combined with Figures 1 to 10 The following describes embodiments of the present invention.

[0046] According to an embodiment of the present invention, a battery pack is provided, having a first direction Z and a second direction X intersecting each other and a third direction Y. The battery pack includes: a housing 1, a cover 5, a plurality of batteries 2 and a plurality of side plates 4.

[0047] Specifically, the box body 1 has a receiving cavity 101, and the cover 5 covers the receiving cavity 101 and is connected to the box body 1. The box body 1 includes a bottom plate 102, two first side beams 103 and two second side beams 104. The two first side beams 103 are spaced apart on the bottom plate 102 along a third direction Y, and the two second side beams 104 are spaced apart on the bottom plate 102 along a second direction X. The two first side beams 103, the two second side beams 104 and the bottom plate 102 form the receiving cavity 101.

[0048] Multiple batteries 2 are disposed in the receiving cavity 101. The multiple batteries 2 are arranged along the third direction Y to form a battery pack. There are multiple battery packs, and the multiple battery packs are arranged along the second direction X.

[0049] Multiple side plates 4 are provided between two adjacent battery packs along the second direction X. The side of the multiple battery packs near the first side beam 103 and the first side beam 103 have a filling gap 6. Along the third direction Y, at least one end of the side plate 4 is provided with an extension 401 that extends beyond the edge of the battery pack. The extension 401 is connected to the first side beam 103 it is near. The extension 401 divides the filling gap 6 into filling sub-spaces. The extension 401 is provided with a potting through hole 402 that connects two adjacent filling sub-spaces.

[0050] In the battery pack of this embodiment, a potting hole 402 is provided on the extension 401 of the side plate 4 extending to the filling gap 6. During potting, the glue flows into one filling sub-space and then flows from the potting hole 402 to another filling sub-space, accelerating the flow of the glue. This allows the filling gap 6 between the battery pack and the first side beam 103 to be filled with glue, enhancing the bonding effect and bonding strength between the battery pack and the first side beam 103, thereby improving the structural strength and stability of the entire battery pack. Furthermore, the glue has a certain degree of flexibility, which can absorb vibration to a certain extent, reduce the impact of external impact on the battery pack, and protect the battery 2 from damage. The glue can also fix the position of the battery 2, preventing the battery 2 from shifting during use and ensuring a stable and reliable connection.

[0051] It should be noted that the adhesive can be a potting compound, which provides protection against water, dust, shock, and insulation, and enhances physical strength. Potting compounds can be epoxy resin potting compounds or polyurethane potting compounds, etc.

[0052] It is understandable that adhesives can also be expanding foam, which offers advantages such as lightweight, good insulation properties, excellent thermal conductivity, reduced stress concentration, and improved mechanical stability. Expanding foam can be made of polyurethane foam, among others.

[0053] Furthermore, the side plate 4 can effectively isolate the battery pack, prevent the battery packs from contacting each other, reduce the risk of short circuits and thermal runaway, enhance the overall structural strength of the battery pack, provide additional mechanical support, protect the battery 2 from external impacts and vibrations, and reduce the failure of the battery 2 unit due to physical damage.

[0054] Specifically, the side plate 4 is usually made of insulating material, which can prevent electrical short circuits between the battery cells 2 and ensure circuit safety.

[0055] It should be noted that the first direction Z is the height direction of the battery pack, the second direction X can be the length direction of the battery pack, and the third direction Y can be the width direction of the battery pack.

[0056] In one embodiment, such as Figure 9As shown, in the first direction Z, the potting through hole 402 is positioned close to the base plate 102. In the height direction of the battery pack, if the position of the potting through hole 402 is too high, it will not be conducive to the flow of adhesive. Therefore, the potting through hole 402 is positioned close to the base plate 102, which facilitates the flow of adhesive, increases the injection speed, and thus improves the injection efficiency.

[0057] Furthermore, the side plate 4 has a surface 403 facing the base plate 102. In the first direction Z, the ratio X of the distance from the center of the glue-filling through hole 402 to the surface 403 to the height of the side plate 4 is 1 / 3 to 1 / 2. If the position of the glue-filling through hole 402 is too low, when the glue exceeds the glue-filling through hole 402, the glue can no longer flow through the glue-filling through hole 402. Therefore, setting the glue-filling through hole 402 such that the ratio of the distance from its center to the surface 403 to the height of the side plate 4 is 1 / 3 to 1 / 2 is more conducive to the flow of glue, resulting in faster glue flow and higher glue injection efficiency.

[0058] Furthermore, the injection speed was tested by setting the center of the injection hole 402 at different locations. The test results are shown in Table 1 below.

[0059] Table 1

[0060] X 1 / 3 2 / 5 1 / 2 Speed of glue application Generally Fast Faster

[0061] In one embodiment, the glue-filling through-hole 402 is funnel-shaped along the second direction X. The funnel-shaped design facilitates unidirectional flow, guides the glue to flow smoothly, reduces the formation of air bubbles, ensures more uniform and dense glue filling, and the larger inlet can accelerate the flow of glue, shorten the glue-filling time, and improve production efficiency.

[0062] It is understood that in another embodiment, such as Figure 10 As shown, the glue-filling through-hole 402 includes a first funnel section 4021, a cylindrical section 4022, and a second funnel section 4023 arranged sequentially along the second direction X. One end of the first funnel section 4021 near the cylindrical section 4022 is connected to one end of the cylindrical section 4022, and the other end of the cylindrical section 4022 is connected to the end of the second funnel section 4023 near the cylindrical section 4022. The diameter of the first funnel section 4021 gradually decreases along the second direction X, while the diameter of the second funnel section 4023 gradually increases along the second direction X. The first funnel section 4021 guides the glue to flow smoothly in, and the second funnel section 4023 guides the glue to flow out, accelerating the flow rate of the glue.

[0063] It is understood that in other embodiments, the potting through-hole 402 is cylindrical or the like.

[0064] In one embodiment, such as Figure 9As shown, there are multiple glue-filling through holes 402, which are staggered along the first direction Z. In other words, the multiple glue-filling through holes 402 are sloped relative to the height direction, which is conducive to the unidirectional flow of glue. Unidirectional flow can accelerate the flow of glue, shorten the glue-filling time, and improve production efficiency.

[0065] In one embodiment, the surface of the glue-filling through-hole 402 is an arc-shaped surface that arches and curves towards or away from the interior of the glue-filling through-hole 402. In other words, the surface of the glue-filling through-hole 402 is a convex arc-shaped surface or a concave arc-shaped surface. The arc-shaped glue-filling through-hole 402 also facilitates the one-way flow of glue. One-way flow can accelerate the inflow of glue, shorten the glue-filling time, and improve production efficiency.

[0066] In one embodiment, there are multiple potting through holes 402, which are arranged in a straight line, a double line, an S-shape, or an M-shape.

[0067] When multiple glue-filling through-holes 402 are arranged in a straight line, the glue flows along a straight path, which is easy to control and monitor, ensuring that the glue is evenly distributed. The straight path reduces dead corners in the glue flow, ensuring that all areas are fully filled, and also facilitates continuous glue flow and reduces the formation of air bubbles.

[0068] When multiple potting holes 402 are arranged in a U-shape, the two parallel rows of potting holes 402 can achieve bidirectional flow, ensuring that the glue is evenly distributed in both directions. They can also achieve multi-path distribution, covering a larger area, reducing unfilled areas, and reducing the formation of air bubbles when injecting glue at a single point, ensuring that the glue is filled more densely.

[0069] When multiple potting through-holes 402 are arranged in an S-shape, the S-shaped path can ensure that the glue is evenly distributed in the tortuous path, reducing the situation of local excessive thickness or thinness. The tortuous path can cover more areas, ensuring that all corners are fully filled.

[0070] When multiple potting holes 402 are arranged in an M-shape, the M-shaped path can achieve multi-directional flow, ensuring that the glue is evenly distributed in multiple directions. It can also achieve multi-path distribution, covering a larger area and reducing unfilled areas.

[0071] It should be noted that, Figure 9 The glue-filling through-holes 402 on the left side are arranged in a staggered manner along the first direction Z. Figure 9 The glue-filling through-holes 402 on the right side are arranged in a straight line along the first direction Z.

[0072] It is understandable that the arrangement of the potting through holes 402 is not limited to this, and the arrangement of the potting through holes 402 can be set according to specific needs.

[0073] In one embodiment, such asFigure 9 As shown, the side plate 4 has a side surface 404 close to the battery pack. The contour shape formed by the potting through hole 402 on the side surface 404 is one or more of polygons, circles, and ellipses. Polygonal, circular, and elliptical potting through holes 402 are convenient to process and manufacture, reducing manufacturing difficulty. Preferably, the polygon is rectangular.

[0074] It is understood that, in another embodiment, the shape of the potting through-hole 402 may also be irregular.

[0075] In one embodiment, such as Figure 8 As shown, the portion of the first side beam 103 near the bottom plate 102 forms a protrusion 1031 that extends towards the battery pack. The corner of the side plate 4 near the bottom plate 102 has a clearance opening 405, into which the protrusion 1031 is inserted. The protrusion 1031 can increase the cross-sectional area of ​​the first side beam 103, improving its bending and shear resistance, thereby enhancing the structural rigidity and stability of the entire battery 2 housing 1. By providing the clearance opening 405 at the corner of the side plate 4 near the bottom plate 102, interference between the side plate 4 and the first side beam 103 can be avoided.

[0076] In one embodiment, the battery pack further includes a structural adhesive layer 7 and a plurality of sealing strips 8. The structural adhesive layer 7 is bonded between the side plate 4 and the battery pack. The sealing strips 8 are arranged at both ends of the side plate 4 along the first direction Z. Sealing strips 8 are arranged on both sides of the side plate 4 along the second direction X. The sealing strips 8 are in contact with the battery pack. The structural adhesive layer 7 is arranged in the space enclosed by the sealing strips 8, the side plate 4 and the battery pack.

[0077] When applying adhesive between the side panel 4 and the battery pack, the sealing strip 8 allows the adhesive to flow in the filling cavity, preventing the adhesive from flowing out from the top and bottom between the battery pack and the side panel 4, thus preventing adhesive leakage. This allows the adhesive to be evenly filled between the side panel 4 and the battery pack. At the same time, the upper sealing strip 8 can divide the space between the side panel 4 and the battery pack into upper and lower spaces, so that the two spaces will not affect each other when applying adhesive separately.

[0078] According to an embodiment of the present invention, another aspect provides an electrical device including the battery pack described above.

[0079] Specifically, the electrical device can be used for devices that require battery packs for power supply, such as electric vehicles and electric bicycles. The aforementioned battery pack facilitates the assembly of the electrical device and also helps to improve its safety performance.

[0080] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery pack having a first direction (Z) and a second direction (X) intersecting each other in pairs, and a third direction (Y), characterized in that, The battery pack includes: The box (1) and the cover (5) are provided. The box (1) has a receiving cavity (101). The cover (5) covers the receiving cavity (101) and is connected to the box (1). The box (1) includes a bottom plate (102), two first side beams (103) and two second side beams (104). The two first side beams (103) are spaced apart on the bottom plate (102) along the third direction (Y). The two second side beams (104) are spaced apart on the bottom plate (102) along the second direction (X). The two first side beams (103), the two second side beams (104) and the bottom plate (102) form the receiving cavity (101). Multiple batteries (2) are disposed in the receiving cavity (101), and the multiple batteries (2) are arranged along the third direction (Y) to form a battery pack. The battery pack is provided in multiple ways, and the multiple battery packs are arranged along the second direction (X). Multiple side plates (4) are provided between two adjacent battery packs along the second direction (X). The multiple battery packs have a filling gap (6) between the side of the battery packs near the first side beam (103) and the first side beam (103). Along the third direction (Y), at least one end of the side plate (4) is provided with an extension (401) that extends beyond the edge of the battery pack. The extension (401) is connected to the first side beam (103) near it. The extension (401) divides the filling gap (6) into filling sub-spaces. The extension (401) is provided with a potting through hole (402) that connects two adjacent filling sub-spaces.

2. The battery pack according to claim 1, characterized in that, In the first direction (Z), the potting through hole (402) is located close to the base plate (102).

3. The battery pack according to claim 2, characterized in that, The side plate (4) has a surface (403) facing the base plate (102), and in the first direction (Z), the ratio of the distance from the center of the potting hole (402) to the surface (403) to the height of the side plate (4) is 1 / 3 to 1 / 2.

4. The battery pack according to claim 3, characterized in that, Along the second direction (X), the potting through-hole (402) is funnel-shaped; Alternatively, the potting through-hole (402) includes a first funnel section (4021), a cylindrical section (4022), and a second funnel section (4023) arranged sequentially along the second direction (X). The first funnel section (4021) is connected to one end of the cylindrical section (4022) near one end of the cylindrical section (4022), and the other end of the cylindrical section (4022) is connected to the second funnel section (4023) near one end of the cylindrical section (4022). The diameter of the first funnel section (4021) gradually decreases along the second direction (X), and the diameter of the second funnel section (4023) gradually increases along the second direction (X).

5. The battery pack according to any one of claims 1 to 4, characterized in that, The number of the glue-filling through holes (402) is multiple, and the multiple glue-filling through holes (402) are staggered along the first direction (Z).

6. The battery pack according to any one of claims 1 to 4, characterized in that, The surface of the potting through hole (402) is an arc-shaped surface that arches and curves toward or away from the interior of the potting through hole (402).

7. The battery pack according to any one of claims 1 to 4, characterized in that, The number of the glue-filling through holes (402) is multiple, and the multiple glue-filling through holes (402) are arranged in a straight line, a double line, an S-shape or an M-shape.

8. The battery pack according to any one of claims 1 to 4, characterized in that, The side plate (4) has a side (404) close to the battery pack, and the contour pattern formed by the potting through hole (402) on the side (404) is one or more of polygons, circles, and ellipses.

9. The battery pack according to any one of claims 1 to 4, characterized in that, The portion of the first side beam (103) near the bottom plate (102) forms a protrusion (1031) that protrudes toward the battery pack. The corner of the side plate (4) near the bottom plate (102) has a clearance opening (405), and the protrusion (1031) is inserted into the clearance opening (405).

10. An electrical device, characterized in that, Includes the battery pack as described in any one of claims 1 to 9.

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