Battery pack

Abstract

The utility model relates to the technical field of battery packs, and discloses a battery pack, at least two rows of battery packs are sequentially arranged along a first direction, and each row comprises at least two single batteries which are sequentially arranged along a second direction; the side surface of each single battery perpendicular to the first direction is a first side surface, and the side surface perpendicular to the third direction is a second side surface; the pressing strip structure comprises a first connecting strip, a second connecting strip and a rubber blocking strip. The second connecting strip and the rubber blocking strip are arranged on one side of the first connecting strip in a protruding mode in the third direction, and the second connecting strip and the rubber blocking strip are arranged at intervals; the rubber blocking strip abuts against the second side face. The first connecting strip between the adhesive blocking strip and the second connecting strip is adhered to at least part of the second side surface of one column of single batteries, and the second connecting strip is adhered to at least part of the first side surface of at least one column of single batteries; a / b is more than or equal to 0.01 and less than or equal to 0.3. According to the battery pack disclosed by the utility model, through the arrangement of the adhesive blocking strip, the strength of the pressing strip structure is enhanced, and the structural adhesive is prevented from overflowing.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, and in particular to a battery pack. Background Art

[0002] The CTP structure refers to a battery construction technology that eliminates the traditional module design and directly integrates the battery cells into a battery pack. However, the current CTP structure has poor connection performance between battery packs, which makes the connection rigidity of the entire battery pack poor. Therefore, in some battery packs, pressure strips are usually used to bond the rows of single cells in sequence with structural adhesive. However, the structural adhesive is easy to overflow to the conductive bar, which may affect the conductive area of ​​the conductive bar. Utility Model Content

[0003] In view of this, the utility model provides a battery pack to solve the problem that the structural adhesive easily overflows onto the conductive bar.

[0004] The utility model provides a battery pack, comprising:

[0005] A battery pack, wherein at least two columns are sequentially arranged along a first direction, and each column includes at least two single cells sequentially arranged along a second direction; a side of the single cell perpendicular to the first direction is a first side, and a side of the single cell perpendicular to a third direction is a second side; wherein the first direction, the second direction and the third direction are perpendicular to each other in pairs;

[0006] The pressure strip structure includes a first connecting strip, a second connecting strip and a blocking rubber strip; the second connecting strip and the blocking rubber strip are both protruding along the third direction on one side of the first connecting strip, and the second connecting strip and the blocking rubber strip are spaced apart; the first connecting strip and the blocking rubber strip are both located on one side of the second side surface, and the blocking rubber strip abuts against the second side surface; the second connecting strip is located on one side of the first side surface; the first connecting strip between the blocking rubber strip and the second connecting strip is bonded to at least part of the second side surface of a column of single cells, and the second connecting strip is bonded to at least part of the first side surface of at least one column of single cells; in the third direction, the height of the blocking rubber strip protruding from the first connecting strip is a, and the height of the second connecting strip protruding from the first connecting strip is b, and a / b satisfies 0.01≤a / b≤0.3.

[0007] Beneficial effects: The first connecting strip between the rubber baffle and the second connecting strip is bonded to the second side surfaces of a row of single battery cells, the second connecting strip is bonded to the first side surfaces of at least one row of single battery cells, and the pressing strip structure is bonded to the two side surfaces of a row of single battery cells, which can enhance the connection effect; the rubber baffle abuts against the second side surface, which can block the structural adhesive at the first connecting strip and prevent the structural adhesive from overflowing to the conductive busbar, avoiding the influence of the overflowing structural adhesive on the conductive area of the conductive busbar; moreover, the rubber baffle, the first connecting strip and the second connecting strip also enclose a caulking groove, increasing the space for accommodating the structural adhesive and enhancing the bonding effect; and the setting of the rubber baffle can also increase the overall strength of the pressing strip structure. When the ratio of the height by which the rubber baffle protrudes from the first connecting strip to the height by which the second connecting strip protrudes from the first connecting strip is too large, it indicates that the protruding height of the rubber baffle is large and the protruding height of the second connecting strip is small. The amount of adhesive in the first connecting strip is large, and more adhesive is required to overflow to the second connecting strip, wasting glue and occupying space. When the ratio of the height by which the rubber baffle protrudes from the first connecting strip to the height by which the second connecting strip protrudes from the first connecting strip is too small, it indicates that the protruding height of the rubber baffle is small and the protruding height of the second connecting strip is large. Although the module stiffness is large when the protruding height of the second connecting strip is too large, when the pressing strip structure is arranged on only one side in the third direction, the first side surface of the single battery cell will be unevenly stressed. When the battery expands, the side with the pressing strip structure abuts and bonds with the second connecting strip, while the other side does not, resulting in uneven clamping force, which is not conducive to the uniform stress of the battery core inside the single battery cell. Moreover, when the shear force on the housing of the single battery cell from the edge of the second connecting strip far from the first connecting strip accumulates to a certain extent, it is easy to cause fatigue and then fracture, resulting in the sealing failure of the battery housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0009] Figure 1 It is a partial structural schematic diagram of a battery pack from a first perspective according to an embodiment of the present invention;

[0010] Figure 2 It is a partial structural schematic diagram of a battery pack from a second perspective according to an embodiment of the present invention;

[0011] Figure 3 is Figure 1 the cross-sectional view taken along the line A-A in

[0012] Figure 4 is Figure 3 the partial enlarged schematic diagram of B in

[0013] Figure 5 Explosion schematic diagram of a part of a battery pack according to an embodiment of the present invention;

[0014] Figure 6 Cross-sectional view of another battery pack according to an embodiment of the present invention;

[0015] Figure 7 is Figure 6 Partial enlarged schematic diagram of C in

[0016] Explanation of reference numerals:

[0017] 1. Battery pack; 11. Single battery; 111. First side; 112. Second side; 113. Top cover; 114. Insulating sheet; 115. Through hole; 116. Terminal; 2. Press strip structure; 21. First connecting strip; 22. Second connecting strip; 23. Glue blocking strip; 3. Structural adhesive. Specific embodiments

[0018] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0019] The following combines Figures 1 to 7 to describe the embodiments of the present invention.

[0020] According to an embodiment of the present invention, a battery pack is provided, including a battery pack 1 and a pressing strip structure 2; the battery pack 1 is provided with at least two columns in a first direction, and each column includes at least two single cells 11 arranged in a second direction in sequence; the side surface of the single cell 11 perpendicular to the first direction is the first side surface 111, and the side surface perpendicular to the third direction is the second side surface 112; the pressing strip structure 2 includes a first connecting strip 21, a second connecting strip 22, and a glue-blocking strip 23; the second connecting strip 22 and the glue-blocking strip 23 both protrude in the third direction on one side of the first connecting strip 21, and the second connecting strip 22 and the glue-blocking strip 23 are arranged at intervals; both the first connecting strip 21 and the glue-blocking strip 23 are located on one side of the second side surface 112, and the glue-blocking strip 23 abuts against the second side surface 112; the second connecting strip 22 is located on one side of the first side surface 111; the first connecting strip 21 between the glue-blocking strip 23 and the second connecting strip 22 is bonded to at least a part of the second side surface 112 of a column of single cells 11, and the second connecting strip 22 is bonded to at least a part of the first side surface 111 of at least one column of single cells 11; wherein, the first direction, the second direction, and the third direction are perpendicular to each other in pairs.

[0021] The first connecting strip 21 between the glue-blocking strip 23 and the second connecting strip 22 is bonded to the second side surface 112 of a column of single cells 11, and the second connecting strip 22 is bonded to the first side surface 111 of at least one column of single cells 11. The pressing strip structure 2 is bonded to both side surfaces of a column of single cells 11, which can enhance the connection effect; the glue-blocking strip 23 abuts against the second side surface 112, which can block the structural adhesive 3 at the first connecting strip 21. The glue-blocking strip 23 is arranged at intervals with the conductive bar of the single cell 11 or abuts against the side part of the conductive bar, preventing the structural adhesive 3 from overflowing to the conductive bar and avoiding the influence of the overflow of the structural adhesive 3 on the conductive area of the conductive bar; and the glue-blocking strip 23, the first connecting strip 21, and the second connecting strip 22 also enclose a glue application groove, increasing the space for accommodating the structural adhesive 3 and enhancing the bonding effect; and the setting of the glue-blocking strip 23 can also increase the overall strength of the pressing strip structure 2.

[0022] In one embodiment, in the third direction, the height by which the glue-blocking strip 23 protrudes from the first connecting strip 21 is a, and the height by which the second connecting strip 22 protrudes from the first connecting strip 21 is b, and a / b satisfies 0.01 ≤ a / b ≤ 0.3.

[0023] When the ratio of the height by which the glue-blocking strip 23 protrudes from the first connecting strip 21 to the height by which the second connecting strip 22 protrudes from the first connecting strip 21 is too large, it indicates that the protruding height of the glue-blocking strip 23 is relatively large, while the protruding height of the second connecting strip 22 is relatively small. The amount of glue in the first connecting strip 21 is large, and a larger amount of glue is required to overflow to the second connecting strip 22, wasting glue and occupying space. When the ratio of the height by which the glue-blocking strip 23 protrudes from the first connecting strip 21 to the height by which the second connecting strip 22 protrudes from the first connecting strip 21 is too small, it indicates that the protruding height of the glue-blocking strip 23 is relatively small, while the protruding height of the second connecting strip 22 is relatively large. Although the module has high stiffness when the protruding height of the second connecting strip 22 is too large, when the pressing strip structure 2 is provided only on one side in the third direction, it will cause uneven stress on the first side 111 of the single battery 11. When the battery expands, one side with the pressing strip structure 2 is pressed and bonded to the second connecting strip 22, while the other side is not. The clamping force is uneven, which is not conducive to the uniform stress of the internal battery core of the single battery 11. Moreover, when the shear force on the housing of the single battery 11 from the edge of the second connecting strip 22 away from the first connecting strip 21 accumulates to a certain extent, it is likely to cause fatigue and then fracture, resulting in the failure of the battery housing seal.

[0024] In a specific embodiment, in the third direction, the ratio of the height a by which the glue-blocking strip 23 protrudes from the first connecting strip 21 to the height b by which the second connecting strip 22 protrudes from the first connecting strip 21 is 0.01.

[0025] In another specific embodiment, in the third direction, the ratio of the height a by which the glue-blocking strip 23 protrudes from the first connecting strip 21 to the height b by which the second connecting strip 22 protrudes from the first connecting strip 21 is 0.3.

[0026] In an embodiment, in the third direction, the height by which the glue-blocking strip 23 protrudes from the first connecting strip 21 is a, and the height by which the second connecting strip 22 protrudes from the first connecting strip 21 is b. a / b satisfies 0.01 ≤ a / b ≤ 0.25.

[0027] In a specific embodiment, in the third direction, the ratio of the height a by which the glue-blocking strip 23 protrudes from the first connecting strip 21 to the height b by which the second connecting strip 22 protrudes from the first connecting strip 21 is 0.01.

[0028] In another specific embodiment, in the third direction, the ratio of the height a by which the glue-blocking strip 23 protrudes from the first connecting strip 21 to the height b by which the second connecting strip 22 protrudes from the first connecting strip 21 is 0.25.

[0029] Specifically, the first direction and the second direction can be mutually perpendicular horizontal directions, and the third direction can be a vertical direction. In the third direction, the height by which the glue-blocking strip 23 protrudes from the first connecting strip 21 is less than the height by which the second connecting strip 22 protrudes from the first connecting strip 21.

[0030] Specifically, if the single cell 11 is approximated as a cuboid, the third side surface perpendicular to the second direction is the surface with the largest area among the six surfaces of the cuboid. The first side surface 111 and the second side surface 112 are two adjacent narrow side surfaces. The conductive bar is a conductive structure for connecting the pole columns 116 of a column of single cells 11.

[0031] In one embodiment, the pressing strip structure 2 includes two rubber blocking strips 23, the second connecting strip 22 is arranged at intervals between the two rubber blocking strips 23, the two rubber blocking strips 23 are respectively abutted against the second side surfaces 112 of two adjacent columns of single cells 11, the second connecting strip 22 is arranged between the first side surfaces 111 of two adjacent columns of single cells 11, pole columns are arranged on the second side surface 112, and the first connecting strip 21 is located between the two columns of pole columns 116 of two adjacent columns of single cells 11.

[0032] The two sides of the second connecting strip 22 in the first direction are respectively bonded to the first side surfaces 111 of two columns of single cells 11, the two rubber blocking strips 23 are respectively abutted against the second side surfaces 112 of two adjacent columns of single cells 11, the two sides of the first connecting strip 21 are respectively bonded to the second side surfaces 112 of two adjacent columns of single cells 11. The pressing strip structure 2 can bond two columns of single cells 11 simultaneously with good bonding effect. Both of the two rubber blocking strips 23 block the structural adhesive 3, and can respectively prevent the structural adhesive 3 from overflowing to the pole columns 116 of the two columns of single cells 11.

[0033] In a preferred embodiment, both the second connecting strip 22 and the rubber blocking strips 23 are perpendicular to the first connecting strip 21. The two rubber blocking strips 23 are respectively arranged at both ends of the first connecting strip 21 in the first direction.

[0034] In one embodiment, the minimum distance L between the rubber blocking strip 23 and the conductive bar satisfies L≥2mm.

[0035] The minimum distance between the rubber blocking strip 23 and the conductive bar is controlled within a proper range, L≥2mm. When the minimum distance L is too large, it can avoid the bonding area between the first connecting strip 21 and the second side surface 112 from being too small, resulting in weakened bonding strength; when the minimum distance L is too small, it can avoid affecting the installation tolerance of the pressing strip structure 2 and causing inability to assemble.

[0036] Specifically, in one embodiment, the minimum distance L between the rubber blocking strip 23 and the conductive bar is 2mm.

[0037] In one embodiment, the height a by which the rubber blocking strip 23 protrudes from the first connecting strip 21 satisfies 1.5mm≤a≤5mm.

[0038] When the height by which the glue-blocking strip 23 protrudes from the first connecting strip 21 is relatively large, the glue capacity at the first connecting strip 21 is large. To overflow to the second connecting strip 22, a greater amount of glue is required, wasting glue and occupying space. When the height by which the glue-blocking strip 23 protrudes from the first connecting strip 21 is relatively small, the glue capacity at the first connecting strip 21 is small, and the bonding effect is poor.

[0039] In a specific embodiment, the height a by which the glue-blocking strip 23 protrudes from the first connecting strip 21 is 1.5 mm.

[0040] In another specific embodiment, the height a by which the glue-blocking strip 23 protrudes from the first connecting strip 21 is 5 mm.

[0041] In one embodiment, in the third direction, the height of the single cell 11 is h, and the ratio of b to h satisfies 0.03 ≤ b / h ≤ 1.1.

[0042] The glue-blocking strip 23 prevents the structural adhesive 3 from overflowing to the positions of the pole column 116 and the conductive bar. At the same time, it enables the structural adhesive 3 to flow in a directed manner between the second connecting strip 22 and the first side surface 111, thereby increasing the fixation between the second connecting strip 22 and the first side surface 111. As a result, the height by which the second connecting strip 22 protrudes from the first connecting strip 21 can be set shorter, without causing uneven stress on the first side surface 111. Additionally, the glue-blocking strip 23 can increase the bending resistance in the second direction. The height by which the glue-blocking strip 23 protrudes from the first connecting strip 21 should not be too large, as this will increase the amount of glue applied and occupy space.

[0043] In a specific embodiment, in the third direction, the ratio of the height b by which the second connecting strip 22 protrudes from the first connecting strip 21 to the height h of the single cell 11 is 0.03.

[0044] In another specific embodiment, in the third direction, the ratio of the height b by which the second connecting strip 22 protrudes from the first connecting strip 21 to the height h of the single cell 11 is 1.1.

[0045] In one embodiment, in the first direction, the thickness c of the glue-blocking strip 23 satisfies 0.5 mm ≤ c ≤ 5 mm.

[0046] The thickness of the glue-blocking strip 23 is generally within 0.5 mm to 5 mm. Specifically, it is also affected by the forming process. If it is too thin, the self-strength of the pressing strip structure 2 becomes poor. If it is too thick, it affects the overall bonding area of the first connecting strip 21.

[0047] In a specific embodiment, in the first direction, the thickness c of the glue-blocking strip 23 is 0.5 mm.

[0048] In another specific embodiment, in the first direction, the thickness c of the glue-blocking strip 23 is 5 mm.

[0049] In one embodiment, in the first direction, the thickness d of the second connecting strip 22 satisfies 0.8 mm ≤ d ≤ 4 mm.

[0050] The thickness of the second connecting strip 22 is generally set between 0.8 and 4 mm. Specifically, it is also affected by the forming process. If it is too thin, the self-strength of the pressing strip structure 2 becomes poor. If it is too thick, the overall bonding area of the second connecting strip 22 is affected. At the same time, the thickness of the second connecting strip 22 is also affected by the thickness of the heat insulation pad between the double-row single-cell batteries 11. Preferably, the thickness of the second connecting strip 22 is the same as the thickness of the heat insulation pad.

[0051] In a specific embodiment, in the first direction, the thickness d of the second connecting strip 22 is 0.8 mm.

[0052] In another specific embodiment, in the first direction, the thickness d of the second connecting strip 22 is 4 mm.

[0053] In one embodiment, the single-cell battery 11 includes a top cover 113. An insulating sheet 114 is provided outside the top cover 113. The side of the insulating sheet 114 facing away from the top cover 113 is the second side 112. A through hole 115 is provided on the insulating sheet 114. The projection of the first connecting strip 21 on the insulating sheet 114 is located within the insulating sheet 114 and covers the through hole 115. The through hole 115 is located between the glue blocking strip 23 and the second connecting strip 22.

[0054] The setting of the through hole 115 can increase the adhesion between the pressing strip structure 2 and the single-cell battery 11.

[0055] Specifically, the pull-out adhesion between the pressing strip structure 2 and the single-cell battery 11 is greater than or equal to 4 Mpa; the shear pull-out is ≥ 4 Mpa.

[0056] In one embodiment, the ratio S of the projected area of the through hole 115 on the top cover 113 to the projected area of the first connecting strip 21 on the top cover 113 satisfies 0.5 ≤ S ≤ 1.

[0057] If the bonding area between the pressing strip structure 2 and the top cover 113 is too small, it is likely to fall off and the bonding strength cannot be achieved. The area of the through hole 115 should not be too large, and the electrical clearance needs to be considered. The electrical clearance refers to the distance from the pole column 116 to the cover plate (metal).

[0058] In one embodiment, the pressing strip structure 2 is made of a glass fiber-reinforced resin material.

[0059] In one embodiment, the pressing strip structure 2 is made of a PCM process material. The PCM process material is a phase change material and is a substance composed of one or more compounds.

[0060] In one embodiment, the pressing strip structure 2 is made of an epoxy resin material.

[0061] Specifically, the strip structure 2 can be made of non-metallic materials such as glass fiber reinforced resin materials, PCM process materials, or epoxy resin materials, etc.

[0062] In one embodiment, the strip structure 2 is made of a metal material, and an insulating layer is sprayed on the surface of the strip structure 2. Among them, the metal material can be B340 / 590 steel plate or 6061-T6 extruded profile.

[0063] In one embodiment, the strip structure 2 is made by compounding a metal material and a composite material.

[0064] Although the 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 this application.

Claims

1. A battery pack, characterized in that: include: A battery pack (1) is provided with at least two columns in sequence along a first direction, each column comprising at least two single cells (11) arranged in sequence along a second direction; the side of the single cell (11) perpendicular to the first direction is a first side (111), and the side perpendicular to a third direction is a second side (112); wherein the first direction, the second direction and the third direction are perpendicular to each other in pairs; A pressure strip structure (2), comprising a first connecting strip (21), a second connecting strip (22) and a stopper strip (23); the second connecting strip (22) and the stopper strip (23) are both arranged protruding along the third direction on one side of the first connecting strip (21), and the second connecting strip (22) and the stopper strip (23) are arranged at intervals; the stopper strip (23) abuts against the second side surface (112); the first connecting strip (21) between the stopper strip (23) and the second connecting strip (22) is bonded to at least a portion of the second side surface (112) of a row of single cells (11), and the second connecting strip (22) is bonded to at least a portion of the first side surface (111) of at least one row of single cells (11); In the third direction, the height a of the rubber stop strip (23) protruding from the first connecting strip (21) is, and the height b of the second connecting strip (22) protruding from the first connecting strip (21) is, and a / b satisfies 0.01≤a / b≤0.

3.

2. The battery pack according to claim 1, characterized in that: The pressure strip structure (2) comprises two rubber blocking strips (23); the second connecting strip (22) is arranged between the two rubber blocking strips (23) at intervals; the two rubber blocking strips (23) are respectively in contact with the second side surfaces (112) of two adjacent columns of single cells (11); the second connecting strip (22) is arranged between the first side surfaces (111) of the two adjacent columns of single cells (11); poles are arranged on the second side surfaces (112); the first connecting strip (21) is located between the two poles (116) of the two adjacent columns of single cells (11).

3. The battery pack according to claim 2, characterized in that: The a / b satisfies 0.01≤a / b≤0.

25.

4. The battery pack according to claim 2, characterized in that: The minimum distance L between the rubber stop strip (23) and the pole (116) satisfies L≥2 mm.

5. The battery pack according to any one of claims 1 to 4, characterized in that: The height a of the rubber stop strip (23) protruding from the first connecting strip (21) satisfies 1.5 mm≤a≤5 mm.

6. The battery pack according to any one of claims 1 to 4, characterized in that: In the third direction, the height of the single battery (11) is h, and the ratio of b to h satisfies 0.03≤b / h≤1.

1.

7. The battery pack according to any one of claims 1 to 4, characterized in that: In the first direction, the thickness c of the rubber blocking strip (23) satisfies 0.5 mm ≤ c ≤ 5 mm; And / or, in the first direction, the thickness d of the second connecting strip (22) satisfies: 0.8 mm ≤ d ≤ 4 mm.

8. The battery pack according to any one of claims 1 to 4, characterized in that: The single cell (11) comprises a top cover (113); an insulating sheet (114) is provided on the outside of the top cover (113); the side of the insulating sheet (114) facing away from the top cover (113) is the second side (112); a through hole (115) is provided on the insulating sheet (114); a projection of the first connecting strip (21) on the insulating sheet (114) is located inside the insulating sheet (114) and covers the through hole (115); and the through hole (115) is located between the rubber stop strip (23) and the second connecting strip (22).

9. The battery pack according to claim 8, characterized in that: A ratio S of a projection area of ​​the through hole (115) on the top cover (113) to a projection area of ​​the first connecting strip (21) on the top cover (113) satisfies 0.5≤S≤1.

10. The battery pack according to any one of claims 1 to 4, characterized in that: The layer strip structure (2) is made of glass fiber reinforced resin material; Alternatively, the layering structure (2) is made of PCM process material; Alternatively, the layering strip structure (2) is made of epoxy resin material; Alternatively, the layering strip structure (2) is made of a metal material, and an insulating layer is sprayed on the surface of the layering strip structure (2); Alternatively, the layering strip structure (2) is made of a composite material of metal material and composite material.

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