Battery components and battery packs

Abstract

The present invention relates to the field of battery technology, and discloses a battery assembly and a battery pack, wherein the battery assembly comprises: a battery cell provided with an explosion-proof valve; a wiring harness plate formed with a slit portion, wherein the projection of the slit portion toward the first surface at least partially overlaps with the explosion-proof valve; the size of the residual portion is defined as a, and along the width direction of the slit portion, the width of the slit portion is defined as b, and the size of the explosion-proof valve is defined as c, satisfying: c>b, and 0.01≤b / a≤12. The battery assembly provided by the present invention limits the ratio range of the width b of the slit portion to the size a of the residual portion. When the ratio is too large, it means that the slit portion is too wide and the residual portion is too short, and the explosion-proof sheet is easy to fly out; and when the ratio is too small, it means that the slit portion is too narrow and the residual portion is too long, which is not conducive to the diffusion of high-heat medium.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery assembly and a battery pack. Background Art

[0002] When a battery is in thermal runaway, it will produce a large amount of mixed gas and pressure will continue to accumulate. By installing an explosion-proof valve on the battery cell, pressure relief and explosion prevention can be achieved.

[0003] In the related technology, after multiple battery cells are stacked to form a battery pack, a flexible circuit board (FPC) is set on the side of the battery cell where the pole is led out. The FPC can sample and monitor the battery voltage, temperature and other information. By covering the explosion-proof valve with the FPC, the explosion-proof plate can be prevented from flying out, but the FPC will also block the discharge of thermal runaway gas, which is not conducive to the diffusion of high-heat media. Summary of the invention

[0004] In view of this, the present invention provides a battery assembly and a battery pack to solve the problem that the FPC cannot meet the high heat medium diffusion requirements while preventing the explosion-proof plate from flying out.

[0005] In a first aspect, the present invention provides a battery assembly, comprising:

[0006] A battery cell, comprising a shell, wherein the shell is provided with an explosion-proof valve; a side of the shell provided with the explosion-proof valve is defined as a first surface, wherein the explosion-proof valve comprises a non-closed thinning portion, wherein the thinning portion is suitable for allowing the internal gas of the battery cell to release pressure by breaking through the thinning portion; and a residual portion located in the non-closed area of ​​the thinning portion, wherein the thinning portion and the residual portion are enclosed together to form a continuous closed loop pattern; and along a direction perpendicular to the first surface, the thickness of the residual portion is greater than the thickness of the thinning portion;

[0007] The wiring harness plate includes an information collection component, which is suitable for collecting the battery temperature and / or voltage of the battery cell; the wiring harness plate is located on the side of the battery cell where the explosion-proof valve is provided; the wiring harness plate is formed with a slit portion, the slit portion is arranged through the upper and lower surfaces of the wiring harness plate, and a gap is formed; the projection of the slit portion toward the first surface at least partially overlaps with the explosion-proof valve;

[0008] The size of the residual portion is defined as a, the width of the slit portion along the width direction is defined as b, and the size of the explosion-proof valve is defined as c, satisfying: c>b, and 0.01≤b / a≤12.

[0009] Beneficial effect: By constraining the width b of the slit, when the width of the slit is too large, the wiring harness plate will shrink after being burned by the high-heat medium, causing the width of the slit to further increase, which may easily cause the explosion-proof plate to fly out; and when the width of the slit is too small, although it can suppress the explosion-proof plate from flying out, it is not conducive to the diffusion of the high-heat medium and the rapid explosion of the explosion-proof valve.

[0010] By constraining the dimension a of the residual part along the width direction of the slit, when the dimension of the residual part is too small, the residual part has less connection with other areas of the shell or cover plate, and the explosion-proof plate is easily torn off the residual part after being subjected to force, causing the explosion-proof plate to fly out; when the dimension of the residual part is too large, the dimension of the thinned part will be reduced accordingly, resulting in too small an opening area of ​​the explosion-proof valve, which is not conducive to the rapid diffusion of high-heat medium.

[0011] By limiting the ratio range of the width b of the slit portion and the size a of the residual portion, when the ratio is too large, it means that the slit portion is too wide and the residual portion is too short, and the explosion-proof plate is easy to fly out; when the ratio is too small, it means that the slit portion is too narrow and the residual portion is too long, which is not conducive to the diffusion of high-heat media.

[0012] In a second aspect, the present invention further provides a battery pack, comprising the battery assembly as described above; a bottom plate, the battery cells are placed on the bottom plate, and the wiring harness plate is arranged on a side of the battery cells away from the bottom plate.

[0013] Because the battery pack includes a battery assembly and has the same effect as the battery assembly, it will not be described here in detail. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 is an exploded schematic diagram of a battery assembly of the present invention;

[0016] Figure 2 It is a schematic diagram of the matching state of the battery cell and the wiring harness plate of the present invention;

[0017] Figure 3 A top view of the matching state of the battery cell and the wiring harness plate of the present invention;

[0018] Figure 4 It is a partial enlarged view of the wiring harness plate of the present invention;

[0019] Figure 5 is a cross-sectional view of a battery cell of the present invention;

[0020] Figure 6 for Figure 5 Partial magnification Figure 1 ;

[0021] Figure 7 for Figure 5 Partial magnification Figure 2 ;

[0022] Figure 8 A cross-sectional view of an insulating top plate provided between a battery cell and a wiring harness plate of the present invention;

[0023] Fig. 9 is a schematic diagram of a cover plate of the present invention;

[0024] Fig.10 Schematic diagram of the protective patch of the present invention Figure 1 ;

[0025] Fig.11 Schematic diagram of the protective patch of the present invention Figure 2 ;

[0026] Fig.12 It is a schematic diagram of the interior of the wiring harness plate of the present invention;

[0027] Fig.13 Schematic diagram of the positional relationship between the battery cell and the slit portion of the present invention Figure 1 ;

[0028] Fig.14 Schematic diagram of the positional relationship between the battery cell and the slit portion of the present invention Figure 2 ;

[0029] Fig.15 Schematic diagram of the positional relationship between the battery cell and the slit portion of the present invention Figure 3 ;

[0030] Fig.16 Schematic diagram of the positional relationship between the battery cell and the slit portion of the present invention Figure 4 ;

[0031] Fig.17 Schematic diagram of the positional relationship between the battery cell and the slit portion of the present invention Figure 5 ;

[0032] Fig.18 The diagram is a diagram showing that the length direction of the residual parts of the adjacent plurality of battery cells is parallel to the length direction of the first surface. Figure 1 ;

[0033] Fig.19 This is a schematic diagram showing that the length direction of the residual parts of two adjacent battery cells is parallel to the width direction of the first surface. Figure 1 ;

[0034] Fig. 20 This is a schematic diagram showing that the length direction of the residual parts of two adjacent battery cells is parallel to the length direction of the first surface. Figure 2 ;

[0035] Fig.21 This is a schematic diagram showing that the length direction of the residual parts of two adjacent battery cells is parallel to the width direction of the first surface. Figure 2 .

[0036] Description of reference numerals:

[0037] 1. Wire harness board; 10. Wire harness board body; 11. Slit portion; 12. Collection branch; 13. Cutting seam; 14. Fuse; 15. Protective film; 16. Core conductive wire; 17. Spacer;

[0038] 2. Battery array; 3. Battery cell; 31. Explosion-proof valve; 311. Residual portion; 312. Thinning portion; 32. Support portion; 321. Air guide groove; 33. Cover plate; 331. Liquid injection hole; 34. Pole; 35. Shell;

[0039] 4. Insulating top plate; 5. Protective patch; 51. Notch; 52. Cantilever portion; 501. First endpoint; 502. Second endpoint; 6. Gap portion. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0041] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0044] In order to clearly describe the positional relationship of each structure in the embodiment of the present invention, the direction and orientation are first defined. The side of the shell 35 provided with the explosion-proof valve 31 is the first surface, the length direction of the slit portion 11 is the first direction, and the width direction of the slit portion 11 is the second direction, wherein the first direction and the second direction are perpendicular to each other.

[0045] It should be noted that the length direction of the slit portion 11 is the first direction, wherein the length direction of the slit portion 11 refers to the length direction of the slit formed through the wiring harness plate from top to bottom; the width direction of the slit portion 11 is the second direction, wherein the width direction of the slit portion 11 refers to the width direction of the slit formed through the wiring harness plate from top to bottom; wherein the length direction of the slit formed through the wiring harness plate from top to bottom is greater than the width direction of the slit formed through the wiring harness plate from top to bottom.

[0046] Combine the following Figures 1 to 21 , describing an embodiment of the present invention.

[0047] According to an embodiment of the present invention, on the one hand, a battery assembly is provided, comprising:

[0048] The battery cell 3 has a shell 35, and the shell 35 is provided with an explosion-proof valve 31; the side of the shell 35 provided with the explosion-proof valve 31 is defined as a first surface, and the explosion-proof valve 31 includes a non-closed thinning portion 312, and the thinning portion 312 is suitable for allowing the internal gas of the battery cell 3 to be depressurized by breaking through the thinning portion 312; and a residual portion 311 located in the non-closed area of ​​the thinning portion 312, and the thinning portion 312 and the residual portion 311 are enclosed together to form a continuous closed loop figure; along the direction perpendicular to the first surface, the thickness of the residual portion 311 is greater than the thickness of the thinning portion 312;

[0049] The wiring harness plate 1 includes an information collection component, which is suitable for collecting the battery temperature and / or voltage of at least one battery cell 3; the wiring harness plate 1 is located on a side of the battery cell 3 where the explosion-proof valve 31 is provided; the wiring harness plate 1 is formed with a slit portion 11, and the slit portion 11 is arranged through the upper and lower surfaces of the wiring harness plate 1 to form a gap; the projection of the slit portion 11 toward the first surface at least partially overlaps with the explosion-proof valve 31;

[0050] The two ends of the thinning portion 312 form a first end and a second end, and the area between the first end and the second end of the thinning portion 312 forms a residual portion 311. The straight-line distance between the first end and the second end is defined as the dimension a of the residual portion 311. Along the width direction of the slit portion 11, the width of the slit portion 11 is defined as b, and the dimension of the explosion-proof valve 31 is defined as c, satisfying: c>b, and 0.01≤b / a≤12.

[0051] By providing the thinning portion 312, when the battery cell 3 experiences thermal runaway, the explosion-proof valve 31 explodes along the path of the thinning portion 312 to achieve exhaust. A residual portion 311 is further provided, and in a direction perpendicular to the plane where the explosion-proof valve 31 is located, the thickness of the residual portion 311 is greater than the thickness of the thinning portion 312, so that when the explosion-proof valve 31 explodes along the path of the thinning portion 312, the residual portion 311 can still be kept connected to other areas of the shell or cover plate to prevent the explosion-proof plate from flying out entirely.

[0052] The wiring harness plate 1 is arranged on the side of the battery cell 3 where the explosion-proof valve 31 is arranged, so that the wiring harness plate 1 can be pressed on the explosion-proof valve 31 , and also plays a role in preventing the explosion-proof plate from flying out.

[0053] At the same time, the wiring harness plate 1 is formed with a slit portion 11, and the projection of the slit portion 11 toward the battery cell 3 at least partially overlaps with the thinning portion 312; it can avoid interfering with the smooth opening of the explosion-proof valve 31, and at the same time ensure smooth exhaust after the explosion-proof valve 31 is opened. Since the wiring harness plate 1 is a sheet structure, the upper surface of the wiring harness plate 1 refers to the side of the wiring harness plate 1 away from the battery cell 3, and the lower surface of the wiring harness plate 1 refers to the side of the wiring harness plate 1 close to the battery cell 3. The upper and lower surfaces of the wiring harness plate 1 are formed with a gap, thereby forming the slit portion 11.

[0054] By constraining the size of the width b of the slit 11, when the width of the slit 11 is too large, the wiring harness plate 1 will undergo thermal contraction after the high-heat medium is burned, causing the width of the slit 11 to further increase, which may easily cause the explosion-proof plate to fly out; and when the width of the slit 11 is too small, although the explosion-proof plate can be suppressed from flying out, it is not conducive to the diffusion of the high-heat medium and the rapid explosion of the explosion-proof valve.

[0055] By constraining the dimension a of the residual portion 311 along the width direction of the slit portion 11, when the dimension of the residual portion 311 is too small, the residual portion 311 is less connected to other areas of the shell or the cover plate, and the explosion-proof plate is easily torn off the residual portion 311 after being subjected to force, causing the explosion-proof plate to fly out; when the dimension of the residual portion 311 is too large, the dimension of the thinning portion 312 will be correspondingly reduced, resulting in an excessively small valve opening area of ​​the explosion-proof valve 31, which is not conducive to the rapid diffusion of high-heat medium.

[0056] The explosion-proof valve 31 includes a non-closed thinning portion 312 and a residual portion 311 located in the non-closed area of ​​the thinning portion 312. The thinning portion 312 and the residual portion 311 together form a continuous closed loop shape. The continuous closed loop shape can be, for example, a runway shape, an ellipse, a rectangle, or the like.

[0057] As an implementation form, the explosion-proof valve 31 includes a plurality of discontinuous thinning portions 312, and a residual portion 311 is provided between adjacent thinning portions 312; the plurality of thinning portions 312 and the plurality of residual portions 311 are enclosed together to form a continuous closed loop figure. Taking the continuous closed loop figure as a runway shape as an example, the formation path of the plurality of thinning portions 312 coincides with the runway shape.

[0058] As another implementation form, the explosion-proof valve 31 includes a continuous thinning portion 312, the two ends of the thinning portion 312 form a first end and a second end, the area between the first end and the second end of the thinning portion 312 forms a residual portion 311, and the thinning portion 312 and the residual portion 311 are enclosed together to form a continuous closed loop figure. Taking the continuous closed loop figure as a runway shape as an example, the formation path of the thinning portion 312 coincides with the runway shape, but the formation path of the residual portion 311 is a straight line.

[0059] Since the thinned portion 312 is formed by locally thinning the first surface of the shell 35 , in order to ensure that the thinned portion 312 and the residual portion 311 are enclosed together to form a continuous closed loop pattern, the two can be better combined to form a continuous closed loop pattern.

[0060] It should be noted that the dimension a of the residual portion 311 refers to the distance between the first end and the second end. Fig.13 As shown, the residual portion 311 is linear, and the length of the residual portion 311 along the second direction is the size a of the residual portion 311 .

[0061] By limiting the ratio range of the width b of the slit portion 11 and the size a of the residual portion 311, when the ratio is too large, it means that the slit portion 11 is too wide and the residual portion 311 is too short, and the explosion-proof plate is easy to fly out; when the ratio is too small, it means that the slit portion 11 is too narrow and the residual portion 311 is too long, which is not conducive to the diffusion of high-heat medium.

[0062] The wiring harness plate 1 may extend along a first direction or a second direction, wherein both the first direction and the second direction may be directions shown in the drawings. In this embodiment, the length direction of the slit portion 11 is parallel to the length direction of the wiring harness plate 1 .

[0063] As a variation, the length direction of the slit 11 can also be perpendicular to the length direction of the harness plate 1. That is, for example, when the length direction of the harness plate 1 is parallel to the first direction, the length direction of the slit 11 is parallel to the second direction. When the battery assembly contains multiple battery cells 3, multiple slits 11 can be provided so that each slit 11 corresponds to an explosion-proof valve of a battery cell 3. And the multiple slits 11 are all parallel to the second direction, and the multiple slits 11 are arranged in parallel and at intervals.

[0064] In this embodiment, the length of the thinning portion 312 ranges from 20 mm to 120 mm. For example, the length of the thinning portion 312 may be 20 mm, 40 mm, 50 mm, 60 mm, 75 mm, 85 mm, 100 mm, or 120 mm, or may be an interval formed by any two of the above values. It should be noted that the length of the thinning portion 312 specifically refers to the distance between the first end and the second end of the thinning portion 312 along the formation path of the thinning portion 312.

[0065] In this embodiment, the size a of the residual portion 311 ranges from 5 mm to 50 mm, for example, it may be 5 mm, 15 mm, 20 mm, 30 mm, 35 mm, 45 mm, or 50 mm, or it may be an interval formed by any two of the above values.

[0066] In this embodiment, the width b of the slit portion 11 ranges from 0.5 mm to 60 mm, for example, it can be 0.5 mm or 1 mm or 1.5 mm or 3.5 mm or 5 mm or 15 mm or 20 mm or 30 mm or 35 mm or 45 mm or 50 mm or 60 mm, or it can be an interval formed by any two of the above values.

[0067] In this embodiment, the value range of b / a is 0.01≤b / a≤12. For example, the specific value of b / a can be 0.01 or 0.1 or 0.2 or 0.5 or 1 or 1.5 or 2.2 or 3 or 5 or 7 or 9 or 11 or 12, or it can be an interval formed by any two of the above values.

[0068] In order to verify the valve opening performance of the explosion-proof valve 31, the valve opening performance is verified by several groups of embodiments and comparative examples. In the embodiment of the present invention, the valve opening performance of the explosion-proof valve 31 needs to meet the following conditions to be qualified: ① the valve opening time △t (unit s) needs to be within 60s; ② the probability of valve opening under the preset valve opening pressure (unit %) needs to be above 55%; ③ the probability of the explosion-proof disc flying out (unit %) needs to be within 30%.

[0069] The present invention does not limit the specific test method for the valve opening performance of the explosion-proof valve 31 , and those skilled in the art may test the valve opening performance of the explosion-proof valve 31 according to conventional technical means.

[0070] Exemplarily, the valve opening performance of the explosion-proof valve 31 can be tested by the following method:

[0071] 100 battery cells 3 are selected. The selected battery cells 3 do not need to be provided with battery cells, but only have a shell 35 (wherein the shell 35 includes a cover plate 33, and the cover plate 33 includes an explosion-proof valve 31). The shell 35 is inflated with gas under a fixed clamping force of 5000N. The gas pressure in the shell 35 is monitored. When the gas is inflated to a specified pressure (for example, the preset valve opening pressure of the explosion-proof valve 31 -0.01MPa), it is maintained. Observe whether the valve is opened under this pressure, and record the following data:

[0072] ① The time from reaching the specified pressure to the actual explosion-proof valve 31 bursting open is the valve opening time △t;

[0073] ② Counting the probability of the explosion-proof valve 31 opening under the specified pressure, wherein the probability of the explosion-proof valve 31 opening under the specified pressure is calculated by dividing the actual number of valve openings by 100 as the probability of the valve opening;

[0074] ③ Observe whether the explosion-proof piece flies out completely, and calculate the probability of the explosion-proof piece flying out completely. The probability of the explosion-proof piece flying out completely is calculated as follows: the number of batteries with the explosion-proof piece flying out completely / 100.

[0075] After actual testing, the present invention is further described with specific embodiments in conjunction with Table 1 below:

[0076] Table 1

[0077]

[0078] In Examples 1 to 6, the values ​​of the width b of the slit portion 11 are all within the preferred value range, that is, the preferred range of the width b of the slit portion 11 satisfies: 10mm≤b≤50mm; the values ​​of the size a of the residual portion 311 are all within the preferred value range, that is, the preferred range of the size a of the residual portion 311 satisfies: 5mm≤a≤40mm; at the same time, the value of b / a is also within the preferred value range, that is, the preferred range of b / a satisfies: 0.25≤b / a≤10. After testing, the valve opening performance of the explosion-proof valve 31 can meet the following requirements: ① The valve opening time △t (unit s) is within 20s; ② The probability of valve opening at the preset valve opening pressure (unit %) is higher than 84%; ③ The probability of the explosion-proof disc flying out as a whole (unit %) is lower than 10%. The explosion-proof valve 31 has excellent valve opening performance.

[0079] In Examples 7 to 10, compared with Examples 1 to 6, the value of b / a is within the preferred value range, that is, the preferred range of b / a satisfies: 0.25≤b / a≤10. However, the value of the width b of the slit portion 11 and the value of the size a of the residual portion 311 are within the upper and lower limits but not all within the preferred value range. After testing, the valve opening performance of the explosion-proof valve 31 can meet the following requirements: ① The valve opening time △t (unit s) is within 35s; ② The probability of valve opening at the preset valve opening pressure (unit %) is higher than 70%; ③ The probability of the entire explosion-proof disc flying out (unit %) is lower than 15%. The valve opening performance of the explosion-proof valve 31 is good.

[0080] In Examples 11 to 12, compared with Examples 1 to 6, the values ​​of the width b of the slit portion 11 are all within the preferred value range, that is, the preferred range of the width b of the slit portion 11 satisfies: 10mm≤b≤50mm; the values ​​of the size a of the residual portion 311 are all within the preferred value range, that is, the preferred range of the size a of the residual portion 311 satisfies: 5mm≤a≤40mm; and the values ​​of b / a are within the upper and lower limits but not all within the preferred value range. After testing, the valve opening performance of the explosion-proof valve 31 can meet the following requirements: ① The valve opening time △t (unit s) is within 40s; ② The probability of valve opening (unit %) under the preset valve opening pressure is higher than 65%; ③ The probability of the explosion-proof disc flying out as a whole (unit %) is lower than 20%. The valve opening performance of the explosion-proof valve 31 is good.

[0081] In Examples 13 to 14, compared with Examples 1 to 6, the values ​​of the width b of the slit portion 11 and the size a of the residual portion 311 are within the upper and lower limits but not all within the preferred value range, and at the same time, the values ​​of b / a are within the upper and lower limits but not all within the preferred value range. After testing, the valve opening performance of the explosion-proof valve 31 can meet the following requirements: ① The valve opening time △t (unit s) is within 50s; ② The probability of valve opening (unit %) under the preset valve opening pressure is higher than 60%; ③ The probability of the explosion-proof disc flying out (unit %) is lower than 25%. The valve opening performance of the explosion-proof valve 31 is acceptable.

[0082] In Examples 15 to 16, compared with Examples 1 to 6, the values ​​of the width b of the slit portion 11 and the size a of the residual portion 311 are beyond the upper and lower limits, while the values ​​of b / a are within the upper and lower limits but not all within the preferred value range. After testing, the valve opening performance of the explosion-proof valve 31 can meet the following requirements: ① The valve opening time △t (unit s) is within 60s; ② The probability of valve opening under the preset valve opening pressure (unit %) is higher than 55%; ③ The probability of the explosion-proof disc flying out (unit %) is lower than 30%. It can only meet the minimum conditions for the valve opening performance of the explosion-proof valve 31, and the test is qualified.

[0083] In comparative examples 1 and 2, the values ​​of the width b of the slit 11 and the size a of the residual portion 311 are beyond the upper and lower limits, and the values ​​of b / a are beyond the upper and lower limits. After testing, the valve opening performance of the explosion-proof valve 31 can meet the following requirements: ① the valve opening time △t (unit s) is above 60s; ② the probability of valve opening under the preset valve opening pressure (unit %) is lower than 55%; ③ the probability of the explosion-proof disc flying out (unit %) is higher than 30%. The minimum conditions for the valve opening performance of the explosion-proof valve 31 cannot be met, and the test fails.

[0084] In some embodiments, along the width direction of the slit portion 11, the preferred range of the width b of the slit portion 11 satisfies: 10 mm ≤ b ≤ 50 mm; the preferred range of the size a of the residual portion 311 satisfies: 5 mm ≤ a ≤ 40 mm;

[0085] Furthermore, the preferred range of b / a satisfies: 0.25≤b / a≤10.

[0086] In some embodiments, in combination Fig.13 As shown, the projection of the slit portion 11 on the plane where the first surface is located at least partially overlaps with the residual portion 311; along the width direction of the slit portion 11, the preferred range of the width b of the slit portion 11 satisfies: 10mm≤b≤50mm; the preferred range of b / a satisfies: 0.25≤b / a≤10.

[0087] When the projection of the slit portion 11 toward the battery cell 3 at least partially overlaps with the residual portion 311, since the area corresponding to the residual portion 311 is not valved, there is no high-heat medium erupting directly at the slit portion 11, so the expansion speed of the gap here will slow down. In order to ensure the smooth diffusion of the high-heat medium, the width of the slit portion 11 is required to be appropriately larger, and the size of the residual portion 311 is required to be appropriately smaller to facilitate the rapid eruption of the high-heat medium.

[0088] In this embodiment, the width b of the slit portion 11 may be 10 mm, 15 mm, 20 mm, 30 mm, 35 mm, 45 mm, or 50 mm, or may be an interval formed by any two of the above values.

[0089] In other embodiments, in combination Fig.14 As shown, the projection of the slit portion 11 toward the first surface completely covers the residual portion 311; along the width direction of the slit portion 11, the width b of the slit portion 11 satisfies: 2mm≤b≤10mm;

[0090] And it satisfies: 0.2≤b / a≤2.

[0091] Since the projection of the slit portion 11 toward the battery cell 3 completely covers the residual portion 311, that is, when the slit portion 11 is completely opposite to the residual portion 311, since the area corresponding to the residual portion 311 is not valved, there is no high-heat medium erupting directly at the slit portion 11, so the speed of the gap expansion here is slower than when the projection of the slit portion 11 toward the battery cell 3 at least partially overlaps with the residual portion 311. Therefore, in order to ensure the smooth diffusion of the high-heat medium, the width of the slit portion 11 is required to be appropriately larger, and the size of the residual portion 311 is required to be appropriately smaller.

[0092] In this embodiment, the width b of the slit portion 11 may be 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 8 mm, or 10 mm, or may be an interval formed by any two of the above values.

[0093] In other embodiments, in combination Fig.15 or Fig.16 or Fig.17 As shown, the projection of the slit portion 11 toward the first surface does not overlap with the residual portion 311; along the width direction of the slit portion 11, the width b of the slit portion 11 satisfies: 0.5 mm ≤ b ≤ 20 mm;

[0094] And it satisfies: 0.012≤b / a≤4.

[0095] Since the projection of the slit portion 11 toward the first surface does not overlap with the residual portion 311, that is, the slit portion 11 does not correspond to the residual portion 311, but the slit portion 11 corresponds to the thinned portion 312 of the explosion-proof valve 31. At this time, the high-heat medium is erupting directly at the slit portion 11, which is conducive to the rapid diffusion of the high-heat medium. The gap here expands at a faster speed, so the width of the slit portion 11 can be appropriately reduced. Since the slit portion 11 will further expand after the high-heat medium erupts, the constraint of the slit portion 11 on the explosion-proof plate will become smaller. In order to prevent the explosion-proof plate from easily breaking the residual portion 311 after being subjected to force, causing the explosion-proof plate to fly out, the size of the residual portion 311 can be appropriately increased, which is more conducive to preventing the explosion-proof plate from flying out as a whole.

[0096] In this embodiment, the width b of the slit portion 11 may be 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 8 mm, 10 mm, 13 mm, 16 mm, or 20 mm, or may be an interval formed by any two of the above values.

[0097] In some embodiments, in combination Fig.12 As shown, the length direction of the slit portion 11 is parallel to the length direction of the wiring harness plate 1 , and along the width direction of the slit portion 11 , the slit portion 11 is located in the middle position of the wiring harness plate 1 , and the projection of the slit portion 11 toward the first surface overlaps with the center position of the explosion-proof valve 31 .

[0098] Since a plurality of core conductive wires 16 are arranged in the wiring harness plate 1 , generally, the number of branches of the core conductive wires 16 to be equipped for the positive and negative poles is equal, and no wires are routed at the position of the slit portion 11 .

[0099] Along the width direction of the slit portion 11, by setting the slit portion 11 in the middle position of the wiring harness plate 1, the width of the wiring harness plate 1 on both sides of the slit portion 11 along the width direction is made equivalent, so that the number of branches of the core conductive wires 16 distributed on both sides of the slit portion 11 along the width direction is more even, which is more convenient for arranging the wiring harness.

[0100] At the same time, the projection of the slit portion 11 toward the first surface overlaps the center position of the explosion-proof valve 31. Therefore, the slit portion 11 and the explosion-proof valve 31 are arranged opposite to each other, ensuring smooth exhaust after the explosion-proof valve 31 explodes, and the eruption effect is better.

[0101] Combination Figure 2 As shown, the length direction of the slit portion 11 is parallel to the length direction of the wiring harness plate 1 , that is, the wiring harness plate 1 also extends along the first direction. At this time, the width direction of the slit portion 11 is parallel to the second direction.

[0102] In other embodiments, in combination Figure 4 As shown, the length direction of the slit 11 is parallel to the length direction of the wiring harness plate 1. Along the width direction of the slit 11, the vertical distance between the side edge of the slit 11 close to the center line of the wiring harness plate 1 and the center line of the wiring harness plate 1 is d, satisfying: 0.5mm≤d≤20mm.

[0103] When the length direction of the slit 11 is parallel to the length direction of the wiring harness plate 1, and there is a spacing d between the slit 11 and the center line of the wiring harness plate 1 along the width direction of the slit 11, that is, the widths of the wiring harness plate 1 on both sides of the slit 11 along the width direction are not equal, one side is larger and the other side is smaller.

[0104] When the vertical distance d between the edge of one side of the slit 11 close to the center line of the wiring harness plate 1 and the center line of the wiring harness plate 1 is large, since the position of the slit 11 is not aligned, the number of branches of the core conductive wire 16 distributed on both sides of the slit 11 along the width direction is uneven, among which, on the side where the width of the wiring harness plate 1 is larger, the number of wiring harnesses is more and more concentrated, while on the side where the width of the wiring harness plate 1 is smaller, the number of wiring harnesses is smaller, ensuring that the impact of the explosion-proof valve opening has less impact on the wiring harness.

[0105] When the vertical distance d between the edge of the slit 11 on one side close to the center line of the harness plate 1 and the center line of the harness plate 1 is small, the number of branches of the core conductive wire 16 distributed on both sides of the slit 11 along the width direction is relatively even, which is more convenient for arranging the harness. It is convenient to arrange the slit 11 directly opposite the explosion-proof valve 31, ensuring smooth exhaust after the explosion-proof valve 31 explodes, and the eruption effect is better.

[0106] In this embodiment, the value of d can be 0.5 mm or 1 mm or 2 mm or 3 mm or 4 mm or 5 mm or 6 mm or 8 mm or 10 mm or 13 mm or 16 mm or 20 mm, or it can be an interval formed by any two of the above values.

[0107] In some embodiments, in combination Fig.13 or Fig.15 As shown, the length direction of the explosion-proof valve 31 is parallel to the length direction of the first surface, and the length direction of the slit portion 11 is perpendicular to the length direction of the residual portion 311 , satisfying: 1mm≤b≤60mm.

[0108] In this embodiment, the width b of the slit portion 11 can be 1mm or 2mm or 3mm or 4mm or 5mm or 6mm or 8mm or 10mm or 13mm or 16mm or 20mm or 26mm or 30mm or 32mm or 37mm or 40mm or 45mm or 48mm or 52mm or 56mm or 60mm, or it can be an interval formed by any two of the above values.

[0109] In some embodiments, in combination Fig.17 As shown, the length direction of the explosion-proof valve 31 is parallel to the thickness direction of the battery cell 3, and the length direction of the slit portion 11 is parallel to the length direction of the residual portion 311, satisfying: 0.5mm≤b≤40mm.

[0110] In this embodiment, the width b of the slit portion 11 can be 0.5mm or 1mm or 2mm or 3mm or 4mm or 5mm or 6mm or 8mm or 10mm or 13mm or 16mm or 20mm or 26mm or 30mm or 32mm or 37mm or 40mm, or it can be an interval formed by any two of the above values.

[0111] To simplify the description, the explosion-proof valve 31 is described as being horizontally placed when the length direction of the explosion-proof valve 31 is parallel to the length direction of the first surface; and the explosion-proof valve 31 is described as being vertically placed when the length direction of the explosion-proof valve 31 is parallel to the thickness direction of the battery cell 3 .

[0112] The explosion-proof valve 31 has a lower valve opening pressure when placed horizontally than when placed vertically. The reason is that the farther the edge of the explosion-proof valve 31 is from the edge of the cover plate 33, the less the cover plate 33 will pull it, and the easier it is to open the valve. When the explosion-proof valve 31 is placed vertically, the distance between the long sides of the explosion-proof valve 31 and the cover plate 33 is too close, and a greater valve opening pressure is required to open the valve. Therefore, when the explosion-proof valve 31 is placed horizontally, the width b of the slit 11 should be wider, and b should be in a more preferred range at this time, while when the explosion-proof valve 31 is placed vertically, the width b of the slit 11 needs to be set narrower.

[0113] In some embodiments, in combination Fig.19 As shown, a plurality of battery cells 3 are stacked to form a battery column 2, and the length direction of the residual portion 311 is parallel to the width direction of the first surface; along the length direction of the first surface, the residual portions 311 of the explosion-proof valves 31 of two adjacent battery cells 3 are arranged away from each other;

[0114] The length direction of the slit portion 11 is parallel to the width direction of the first surface. Along the width direction of the slit portion 11 , the width b of the slit portion 11 satisfies: 0.5 mm≤b≤50 mm.

[0115] Along the length direction of the first surface, the residual parts 311 of the explosion-proof valves 31 of two adjacent battery cells 3 are arranged far away from each other, and the length direction of the slit portion 11 is parallel to the width direction of the first surface. Therefore, when the explosion-proof valves 31 of two adjacent battery cells 3 are opened at the same time, the explosion-proof plates will respectively lift up the wiring harness plates 1 on both sides of the slit portion 11, thereby easily accelerating the expansion speed of the slit portion 11, and the speed of the gap expansion of the slit portion 11 will be accelerated. At this time, the width of the slit portion 11 can be set smaller to avoid heat accumulation in a short time when the valve is opened and burning the wiring harness plate 1 to increase the width of the slit portion 11, which will not affect the ejection of high-temperature medium.

[0116] In this embodiment, the width b of the slit 11 can be 0.5mm or 1mm or 2mm or 3mm or 4mm or 5mm or 6mm or 8mm or 10mm or 13mm or 16mm or 20mm or 26mm or 30mm or 32mm or 37mm or 40mm or 45mm or 48mm or 50mm, or it can be an interval formed by any two of the above values.

[0117] In this embodiment, in a direction perpendicular to the plane where the wiring harness plate 1 is located, the thickness of the wiring harness plate 1 is f, which satisfies: 140 micrometers ≤ f ≤ 185 micrometers.

[0118] Since the residual parts 311 of the explosion-proof valves 31 of two adjacent battery cells 3 are arranged far away from each other, the slit part 11 in the area between the two explosion-proof valves 31 is heated more concentratedly, the heat accumulates faster, the gap expansion speed of the slit part 11 will be accelerated, and the thickness of the wiring harness plate 1 can be thicker.

[0119] In some other embodiments, in combination Fig. 20 , Fig.21 As shown, a plurality of battery cells 3 are stacked to form a battery column 2. Based on the current placement position of the battery cells 3, the residual portions 311 of the explosion-proof valves 31 of two adjacent battery cells 3 are disposed at the same position on the first surface;

[0120] The length direction of the slit portion 11 is parallel to the width direction of the first surface. Along the width direction of the slit portion 11 , the width b of the slit portion 11 satisfies: 1 mm ≤ b ≤ 60 mm.

[0121] It should be noted that, for each individual battery cell 3, the residual portion thereof is disposed at the same position on the first surface. However, according to different requirements for series and parallel connection of the battery array, the placement direction of the battery cells 3 is different when they are placed, that is, the pole orientations of the battery cells 3 are different. In this embodiment, based on the current placement position of the battery cells 3, the residual portions 311 of the explosion-proof valves 31 of two adjacent battery cells 3 are disposed at the same position on the first surface.

[0122] Since the residual parts 311 of the explosion-proof valves 31 of two adjacent battery cells 3 are set at the same position on the first surface; when the explosion-proof valves 31 of two adjacent battery cells 3 explode at the same time, since the residual parts 311 remain connected, the explosion-proof plate will guide the injection direction of the high-heat medium, and the opening directions of the explosion-proof valves 31 of the two adjacent battery cells 3 are consistent, so that the two adjacent battery cells 3 will not spray against each other, the heat is not concentrated, and the slit part 11 is not easy to expand due to heat. In order to avoid affecting the eruption of the high-heat medium, the width of the slit part 11 can be set larger at this time to ensure that the high-heat medium is ejected in time. At the same time, since the opening directions of the explosion-proof valves 31 of the two adjacent battery cells 3 are consistent, heat will not accumulate due to the collision of the high-heat medium, and the explosion-proof plate is less likely to fly out, so the size of the residual part 311 can be set smaller.

[0123] In this embodiment, the width b of the slit portion 11 can be 1mm or 2mm or 3mm or 4mm or 5mm or 6mm or 8mm or 10mm or 13mm or 16mm or 20mm or 26mm or 30mm or 32mm or 37mm or 40mm or 45mm or 48mm or 52mm or 56mm or 60mm, or it can be an interval formed by any two of the above values.

[0124] In this embodiment, in a direction perpendicular to the plane where the wiring harness plate 1 is located, the thickness of the wiring harness plate 1 is f, which satisfies: 155 micrometers ≤ f ≤ 235 micrometers.

[0125] Since the explosion-proof valves 31 of two adjacent battery cells 3 have the same opening direction, the heat accumulation when the high-temperature medium erupts is between the opposite opening directions and the opposite opening directions, so the thickness of the wiring harness plate 1 needs to be selected moderately.

[0126] In some other embodiments, in combination Fig.18As shown, a plurality of battery cells 3 are stacked to form a battery row 2, and the length direction of the residual portion 311 is parallel to the length direction of the first surface; along the width direction of the first surface, the residual portion 311 of the explosion-proof valve 31 of one battery cell 3 is arranged close to the residual portion 311 of the explosion-proof valve 31 of the battery cell 3 on one side, and is arranged away from the residual portion 311 of the explosion-proof valve 31 of the battery cell 3 on the other side;

[0127] The length direction of the slit portion 11 is parallel to the width direction of the first surface. Along the width direction of the slit portion 11 , the width b of the slit portion 11 satisfies: 1 mm ≤ b ≤ 50 mm.

[0128] Since, along the width direction of the first surface, the residual portion 311 of the explosion-proof valve 31 of one battery cell 3 is arranged close to the residual portion 311 of the explosion-proof valve 31 of the battery cell 3 on one side, and is arranged away from the residual portion 311 of the explosion-proof valve 31 of the battery cell 3 on the other side; that is, when the explosion-proof valve 31 is opened, the opening direction of the explosion-proof valve 31 of one battery cell 3 is opposite to the opening direction of the explosion-proof valve 31 of the battery cell 3 on one side, and is opposite to the opening direction of the explosion-proof valve 31 of the battery cell 3 on the other side, that is, when the explosion-proof valves 31 of multiple battery cells 3 explode at the same time, since the residual portion 311 is still connected, the explosion-proof sheet will guide the injection direction of the high-temperature medium, so that the battery cell 3 and the battery cell 3 adjacent to one side are in a state of facing each other, and the battery cell 3 adjacent to the other side is in a state of back-to-back injection. The heat of the two battery cells 3 in the opposite spraying state is concentrated, and the speed of the gap expansion of the slit part 11 will be accelerated. At this time, the width of the slit part 11 can be set smaller to avoid the accumulation of heat in a short time when the valve is opened, which will ablate the wiring harness plate 1 and increase the width of the slit part 11, and will not affect the spraying of the high-heat medium; while the heat of the two battery cells 3 in the opposite spraying state is not concentrated, and the slit part 11 is not easy to expand due to heat. In order to avoid affecting the spraying of the high-heat medium, the width of the slit part 11 can be set larger. The two phases are combined, and the width b of the slit part 11 can be reasonably selected by taking the middle value.

[0129] In this embodiment, the width b of the slit portion 11 can be 1mm or 2mm or 3mm or 4mm or 5mm or 6mm or 8mm or 10mm or 13mm or 16mm or 20mm or 26mm or 30mm or 32mm or 37mm or 40mm or 45mm or 48mm or 50mm, or it can be an interval formed by any two of the above values.

[0130] In this embodiment, the thickness of the harness plate 1 in the direction perpendicular to the plane where the harness plate 1 is located is f, which satisfies: 185 microns ≤ f ≤ 335 microns. Since the thickness f of the harness plate 1 needs to take into account two states, the value of f should also be moderate.

[0131] In some embodiments, in combination Figure 5-Figure 8 As shown, the battery assembly includes a cover plate 33, and the explosion-proof valve 31 is arranged on the cover plate 33 and is located on a side surface of the cover plate 33 facing the wiring harness plate 1 or a side surface facing away from the wiring harness plate 1;

[0132] The cover plate 33 is further provided with a support portion 32 on the outer peripheral side surrounding the explosion-proof valve 31 . The support portion 32 extends toward the wire harness plate 1 and is adapted to support the wire harness plate 1 .

[0133] The cover plate 33 has a surface facing one side of the wiring harness plate 1 or a surface facing away from the wiring harness plate 1 to form an explosion-proof valve installation groove. By setting the explosion-proof valve 31 in the explosion-proof valve installation groove, the explosion-proof valve 31 can be installed and fixed. Specifically, the explosion-proof valve 31 is fixedly connected to the cover plate 33 by welding.

[0134] The explosion-proof valve installation hole is formed through the area of ​​the cover plate 33 corresponding to the explosion-proof valve 31, so that when the explosion-proof valve 31 explodes along the path of the thinned portion 312, the explosion-proof valve installation hole can make way for the explosion path of the explosion-proof valve 31. In the direction perpendicular to the plane where the cover plate 33 is located, the path of the thinned portion 312 is located within the range of the explosion-proof valve installation hole. The explosion-proof valve installation groove is arranged around the circumferential edge of the explosion-proof valve installation hole.

[0135] A support portion 32 is also provided on the outer peripheral side of the cover plate 33 surrounding the explosion-proof valve 31. The support portion 32 extends toward the wiring harness plate 1 and is suitable for supporting the wiring harness plate 1. After the support portion 32 supports the wiring harness plate 1, a gap is left between the wiring harness plate 1 and the explosion-proof valve 31, thereby preventing the wiring harness plate 1 from directly sticking to the explosion-proof plate and affecting its explosion.

[0136] In this embodiment, the explosion-proof valve 31 is disposed on a surface of the cover plate 33 facing away from the harness plate 1 , and the support portion 32 is supported between the harness plate 1 and the explosion-proof valve 31 , so that a gap portion 6 is formed between the harness plate 1 and the explosion-proof valve 31 .

[0137] That is, the cover plate 33 is recessed on the surface of one side facing away from the wire harness plate 1 to form an explosion-proof valve installation groove, so that the explosion-proof valve 31 can be conveniently set in the explosion-proof valve installation groove, so that the explosion-proof valve 31 and the support portion 32 are respectively located on both sides of the cover plate 33, so that more gaps are reserved between the wire harness plate 1 and the explosion-proof valve 31, thereby preventing the wire harness plate 1 from being directly attached to the explosion-proof plate and affecting its explosion.

[0138] As one implementation form of the specific structure of the support portion 32, the support portion 32 is disposed on both sides of the explosion-proof valve 31 in the length direction and extends along the width direction of the explosion-proof valve 31;

[0139] And / or, the support parts 32 are disposed on both sides of the explosion-proof valve 31 in the width direction and extend along the length direction of the explosion-proof valve 31 .

[0140] The support portion 32 is provided in a strip shape to play a supporting role, so that a gap is formed between the wiring harness plate 1 and the explosion-proof valve 31, thereby preventing the wiring harness plate 1 from directly sticking to the explosion-proof plate and affecting its explosion, thereby ensuring smooth opening of the explosion-proof valve 31.

[0141] As another implementation form of the specific structure of the support portion 32 , the support portion 32 is arranged around the explosion-proof valve 31 so that a cavity is formed between the support portion 32 , the wiring harness plate 1 and the explosion-proof valve 31 .

[0142] By setting the support part 32 around the explosion-proof valve 31, it is not only possible to prevent the harness plate 1 from being directly attached to the explosion-proof plate to affect its explosion, ensuring the smooth opening of the explosion-proof valve 31, but also to make the support part 32 surround the circumferential edge of the explosion-proof valve mounting hole, playing a structural reinforcement role for the explosion-proof valve mounting hole, so as to avoid the explosion-proof valve 31 from being twisted and deformed due to the high heat of welding when the explosion-proof valve 31 is welded to the cover plate 33, and ensure that the opening pressure of the explosion-proof valve 31 is accurately controllable. And by forming a cavity between the support part 32, the harness plate 1 and the explosion-proof valve 31, it is convenient to perform air tightness detection on the explosion-proof valve 31, and at the same time, reserve air storage space for the explosion-proof valve 31 after the explosion.

[0143] Furthermore, in this embodiment, the support portion 32 is runway-shaped, so as to match the structure of the explosion-proof valve mounting hole. When the support portion 32 is runway-shaped, the support area is large, there are no edges and corners around the perimeter, and when the slit is located in the middle of the runway-shaped, the support portion 32 can evenly support the wiring harness plate 1.

[0144] As a variation, the support portion 32 may also be elliptical or rectangular.

[0145] In some embodiments, the support portion 32 is made of plastic or metal.

[0146] In some embodiments, the support portion 32 and the cover plate 33 are provided separately.

[0147] By providing the support portion 32 and the cover plate 33 separately, the support portion 32 can be easily disassembled and can be removed when the support portion 32 is not needed.

[0148] In some other embodiments, the support portion 32 and the cover plate 33 are integrally formed.

[0149] By integrally forming the support portion 32 and the cover plate 33, processing and forming are convenient, the support effect is better, and the support portion 32 is prevented from being dislocated due to external force during the support process. At the same time, the integrally forming of the support portion 32 and the cover plate 33 can also improve the strength of the cover plate 33 in the explosion-proof valve area, making it less likely to deform, and ensuring that the opening pressure of the explosion-proof valve 31 is accurately controllable.

[0150] In some embodiments, in combination Figure 6 As shown, in a direction perpendicular to the plane where the cover plate 33 is located, the height of the support portion 32 protruding from the surface of the cover plate 33 toward the wiring harness plate 1 side is h, satisfying: 0.005≤h / b≤2.

[0151] The support portion 32 is supported between the wire harness plate 1 and the explosion-proof valve 31 so that a gap portion is formed between the wire harness plate 1 and the explosion-proof valve 31 .

[0152] In the direction perpendicular to the plane where the cover plate 33 is located, the higher the height of the support portion 32 protruding from the surface of the cover plate 33 toward the wiring harness plate 1 side, the larger the exhaust space of the gap portion, and the corresponding slit portion 11 can be set smaller. At the same time, the height of the support portion 32 protruding from the surface of the cover plate 33 toward the wiring harness plate 1 side should not be too high. When the support portion 32 is too high or even exceeds the height of the top surface of the pole, it is inconvenient to connect the collection branch 12 with the pole, and the collection branch 12 has to bend downward, and after being grouped, it will occupy too much Z-direction space. On the contrary, if the support portion 32 is too short, the exhaust space of the gap portion will be smaller, which is not conducive to the eruption of high-temperature media, and the gap between the wiring harness plate 1 and the explosion-proof valve 31 is too small, which is easy to affect the explosion of the explosion-proof plate.

[0153] In some other embodiments, the preferred range of h / b may be selected as 0.01≤h / b≤2.

[0154] In some embodiments, in combination Figure 6 As shown, in a plane parallel to the cover plate 33, the distance between the surface of the support portion 32 close to the explosion-proof valve 31 and the surface away from the explosion-proof valve 31 is defined as the thickness j of the support portion 32, which satisfies: 0.008≤j / b≤3.

[0155] In the plane parallel to the cover plate 33, the spacing between the surface of the support portion 32 close to the explosion-proof valve 31 and the surface away from the explosion-proof valve 31 is defined as: the wider the thickness of the support portion 32, the larger the area of ​​the support portion 32 used to support the wiring harness plate 1, the firmer the wiring harness plate 1, and the support portion 32 surrounds the circumferential edge of the explosion-proof valve mounting hole, the greater the structural reinforcement effect on the explosion-proof valve mounting hole, the higher the strength of the cover plate near the explosion-proof valve 31, the more stable the valve opening pressure, and the larger the valve opening threshold can be set, so that the slit portion 11 can be set smaller, and correspondingly, the width of the wiring harness plate 1 for routing is also larger. In addition, due to the limited space of the cover plate 33, the support portion 32 should not be too wide to avoid occupying too much space for setting other structural components. At the same time, the slit portion 11 should not be too small to avoid hindering the eruption of high-temperature medium.

[0156] In some embodiments, a protective patch 5 is provided between the slit portion 11 and the explosion-proof valve 31 , and the protective patch 5 is suitable for preventing impurities from falling onto the explosion-proof valve 31 , and the projection of the slit portion 11 toward the first surface overlaps with the protective patch 5 .

[0157] By arranging the protective patch 5 between the slit 11 and the explosion-proof valve 31, and the projection of the slit 11 toward the first surface overlaps with the protective patch 5, it is possible to prevent impurities such as dust from passing through the slit 11 and falling onto the explosion-proof valve 31, especially to prevent conductive impurities from falling onto the explosion-proof valve 31, thereby preventing corrosion or damage to the explosion-proof valve 31 and improving safety performance.

[0158] In some embodiments, in combination Figure 8 As shown, the wiring harness board 1 includes a wiring harness board body 10, the thickness of the wiring harness board body 10 is defined as m, and the thickness of the protective patch 5 is defined as k, satisfying: 0.29≤k / m≤2.14.

[0159] By limiting the upper limit of the ratio of the thickness of the protective patch 5 to the thickness of the wiring harness plate body 10, it is possible to prevent the thickness of the protective patch 5 from being too large and the thickness of the wiring harness plate body 10 from being too thin, and to prevent the protective patch 5 from propping up the wiring harness plate body 10 and causing it to be placed unevenly. In addition, if the thickness of the protective patch 5 is too large, it will occupy the gap space reserved between the wiring harness plate 1 and the explosion-proof valve 31, thereby reducing the exhaust space for the eruption and affecting the eruption of the high-temperature medium. At the same time, by limiting the lower limit of the ratio of the thickness of the protective patch 5 to the thickness of the wiring harness plate body 10, it is possible to prevent the thickness of the protective patch 5 from being too small and the thickness of the wiring harness plate body 10 from being too large, and to prevent the protective patch 5 from being too small and easily breaking and failing to achieve the dustproof effect.

[0160] In some other embodiments, the preferred range of k / m may be selected as 0.35≤k / m≤2.

[0161] In some embodiments, in combination Figure 6 As shown, the thickness of the protective patch 5 is defined as k, which satisfies: 0.0016≤k / b≤0.6.

[0162] By limiting the lower limit of the ratio of the thickness of the protective patch 5 to the width of the slit 11, the thickness of the protective patch 5 is prevented from being too small and the width of the slit 11 is too large, and the protective patch 5 is prevented from being too small and easily broken and ineffective, and the dustproof effect is not achieved. At the same time, by limiting the upper limit of the ratio of the thickness of the protective patch 5 to the width of the slit 11, the thickness of the protective patch 5 is prevented from being too large and the width of the slit 11 is too small, and the protective patch 5 is prevented from being too large and occupying the gap space reserved between the wiring harness plate 1 and the explosion-proof valve 31, thereby reducing the exhaust space for eruption and affecting the eruption of high-heat medium.

[0163] In some embodiments, the protection patch 5 is fixed to a side of the support portion 32 facing the wiring harness plate 1 .

[0164] By fixing the protective patch 5 to the support portion 32, the protective patch 5 does not occupy the exhaust space, thereby ensuring the gap space reserved between the wiring harness plate 1 and the explosion-proof valve 31, and ensuring the smooth eruption of the high-temperature medium.

[0165] The protective patch 5 can be a small strip that just blocks the gap formed by the slit portion 11 , or can be a whole piece that covers the explosion-proof valve 31 .

[0166] In some embodiments, the projection of the protection patch 5 toward the first surface covers the thinned portion 312 .

[0167] The thinned portion 312 of the explosion-proof valve is completely covered by the projection of the protection patch 5 toward the first surface, so that the protection patch 5 protects the entire thinned portion 312 of the explosion-proof valve from being contaminated. Impurities such as dust are prevented from passing through the slit 11 and falling onto the thinned portion 312 of the explosion-proof valve 31. Corrosion or damage to the thinned portion 312 is avoided, thereby improving safety performance.

[0168] In some embodiments, in combination Figure 6 , Figure 7 As shown, the cover plate 33 is further provided with a support portion 32 on the outer peripheral side surrounding the explosion-proof valve 31, and the support portion 32 is provided with an air guide groove 321, and the direction from the surface of the support portion 32 close to the explosion-proof valve 31 to the surface of the side away from the explosion-proof valve 31 is defined as the thickness direction of the support portion 32;

[0169] Along the thickness direction of the support portion 32 , the air guide groove 321 penetrates the support portion 32 ;

[0170] In a direction parallel to the plane where the explosion-proof valve 31 is located and perpendicular to the thickness direction of the support portion 32 , the maximum width of the air guide groove 321 is n, satisfying: 0.0016≤n / b≤2.

[0171] In this embodiment, by fixing the protective patch 5 on the side of the support portion 32 facing the wiring harness plate 1 and by arranging the support portion 32 around the explosion-proof valve 31, the protective patch 5, the explosion-proof valve 31 and the support portion 32 can form an air storage chamber.

[0172] By providing the gas guide groove 321 through the support portion 32 , the gas storage chamber can be connected to the outside, which facilitates helium detection.

[0173] By limiting the ratio of the maximum width of the air guide groove 321 to the width of the slit portion 11 , when the maximum width of the air guide groove is large, the high-heat medium can quickly melt the protective patch, and at this time the width of the slit portion 11 can be set to be narrower.

[0174] In some other embodiments, the preferred range of n / b may be selected as 0.002≤n / b≤1.8.

[0175] In some embodiments, in combination Figure 6 , Figure 7 As shown, along the direction perpendicular to the plane where the explosion-proof valve 31 is located, the maximum height of the air guide groove 321 is o, satisfying: 0.0016≤o / b≤1.

[0176] By limiting the ratio of the maximum height of the air guide groove 321 to the width of the slit portion 11 , when the maximum height of the air guide groove 321 is large, the high-heat medium can quickly melt the protective patch, and at this time the width of the slit portion 11 can be set to be narrower.

[0177] In some embodiments, the projection of the slit portion 11 toward the first surface overlaps with the air guide groove 321 , satisfying: 0.01≤n / b≤2.

[0178] When the projection of the slit portion 11 toward the first surface overlaps with the air guide groove 321 , the high-temperature medium can melt the gap of the slit portion 11 more quickly to expand it. At this time, the width of the slit portion 11 can be set to be narrower.

[0179] In some other embodiments, the projection of the slit portion 11 toward the first surface does not overlap with the air guide groove 321 , and satisfies: 0.0016≤n / b≤1.9.

[0180] When the projection of the slit portion 11 toward the first surface does not overlap with the air guide groove 321, the high-temperature medium melts the gap of the slit portion 11 at a slower speed, that is, the expansion speed of the slit portion 11 is slower. At this time, the width of the slit portion 11 can be set wider to ensure smooth exhaust.

[0181] In some embodiments, the air guide groove 321 is a V-shaped groove, and the opening cross-sectional area of ​​the support portion 32 gradually decreases from the side of the support portion 32 close to the wiring harness plate 1 to the side away from the wiring harness plate 1 .

[0182] In some embodiments, the protective patch 5 is adhesively connected to the support portion 32. The adhesive connection can make assembly convenient and quick.

[0183] In some embodiments, the overlapping area between the protective patch 5 and the support portion 32 is at least partially provided with an adhesive layer for bonding, and a notch is partially formed in the adhesive layer perpendicular to the plane where the protective patch 5 is located so that the projection of the adhesive layer and the air guide groove 321 do not overlap.

[0184] A gap is formed locally in the adhesive layer so that the projection of the adhesive layer and the air guide groove 321 do not overlap, which can prevent the adhesive layer from blocking the air guide groove 321 and affecting the helium detection, and at the same time avoid poor exhaust.

[0185] In some embodiments, in a direction parallel to the plane where the protective patch 5 is located and perpendicular to the thickness direction of the support portion 32 , the width of the notch is p, satisfying: 2≤n / p≤5.

[0186] By limiting the ratio of the maximum width of the air guide groove 321 to the width of the gap formed locally in the adhesive layer, when the ratio is too large, it means that the air guide groove 321 is too wide and the gap in the adhesive layer is small, which may cause the adhesive layer to overflow and block the air guide groove 321; when the ratio is too small, it means that the gap in the adhesive layer is too wide, which is not conducive to the fixation of the protective patch 5.

[0187] It should be noted that in some other embodiments, the protective patch 5 is provided with a notch 51, and the notch 51 and the air guide groove 321 are parallel and independent features, that is: when the support portion 32 is provided with the air guide groove 321, the protective patch 5 is not provided with the notch 51; and when the protective patch 5 is provided with the notch 51, the support portion 32 is not provided with the air guide groove 321.

[0188] In some embodiments, the protective patch 5 is provided with a notch 51, and the notch 51 penetrates the protective patch 5 in a direction perpendicular to the plane where the protective patch 5 is located;

[0189] The total length of the notch 51 is q, which satisfies: 0.016≤q / b≤10.

[0190] The protective patch 5 is provided with a notch 51, and the notch 51 penetrates the protective patch 5 in the thickness direction of the protective patch 5. The notch 51 is in a closed state under normal conditions, that is, the gas storage chamber formed by the protective patch 5, the explosion-proof valve 31 and the support portion 32 is a closed chamber. When the battery is tested for air tightness, the notch 51 can be in an open state under a preset pressure, so that the gas storage chamber is a non-sealed chamber. The notch 51 can effectively protect the explosion-proof valve 31 under normal use, and the notch can be used for air tightness testing of the battery, thereby improving the performance of the battery.

[0191] The total length of the notch 51 refers to the length of the notch 51 extending in the plane where the protective patch 5 is located. When there are multiple notches 51 or the notches 51 are arranged in a staggered manner, the total length of the notch 51 refers to the sum of the lengths of the multiple notches.

[0192] When the ratio of the total length of the notch 51 to the width of the slit 11 is larger, the total length of the notch 51 is longer, the high-heat medium is easier to break through the protective patch 5, which is conducive to the diffusion of the high-heat medium. At this time, the width of the slit 11 can be set smaller; conversely, when the ratio of the total length of the notch 51 to the width of the slit 11 is smaller, the total length of the notch 51 is shorter, the high-heat medium is less likely to break through the protective patch 5, which is not conducive to the diffusion of the high-heat medium. At this time, the width of the slit 11 can be set larger. However, the total length of the notch 51 should not be too long to avoid causing the strength of the protective patch 5 to deteriorate and prevent the protective patch 5 from being easily damaged.

[0193] In this embodiment, the total length q of the notch 51 is in the range of 3 mm ≤ q ≤ 10 mm. The total length q of the notch 51 can be 3 mm, 4 mm, 5 mm, 6 mm, 8 mm, 9 mm, 10 mm, etc.

[0194] In some other embodiments, the preferred range of q / b may be selected as 0.02≤q / b≤9.

[0195] In some embodiments, the thickness of the protective patch 5 is k, satisfying: 10≤q / k≤100, and 0.1mm≤k≤0.3mm.

[0196] If the thickness of the protective patch 5 is too large, it will be difficult for the notch 51 to open during the airtightness test, thus affecting the test accuracy; if the thickness of the protective patch 5 is too small, the protective patch 5 may be in an open state in a natural state, and foreign matter such as electrolyte, water, metal filings, and dust may easily enter the protective patch 5, causing battery safety risks.

[0197] At the same time, if the ratio of the total length of notch 51 to the thickness of protective patch 5 is too small, it will be difficult for notch 51 to open under a specific pressure; if the ratio of the total length of notch 51 to the thickness of protective patch 5 is too large, notch 51 will be too long, or the thickness of protective patch 5 will be too small, making it impossible for protective patches 5 on both sides of notch 51 to support each other, notch 51 will be easy to open in a natural state, and the structural strength will also be low.

[0198] In this embodiment, the thickness k of the protective patch 5 can be 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, etc.

[0199] In some embodiments, in a direction perpendicular to the plane where the protective patch 5 is located, the area of ​​the area enclosed by the circumferential edge of the protective patch 5 is s; in a direction perpendicular to the plane where the cover plate 33 is located, the area of ​​the area enclosed by the circumferential edge of the cover plate 33 is t; satisfying: 300mm 2 ≤s≤1500mm 2 , and 0.015≤s / t≤0.75.

[0200] By limiting the area s of the region enclosed by the circumferential edge of the protection patch 5 , the protection patch 5 can have a sufficient protection area and the area of ​​the protection patch 5 will not be too large, thereby improving the performance of the protection patch 5 .

[0201] By limiting the upper limit of s / t, material waste caused by excessive area of ​​the protection patch 5 can be avoided; by limiting the lower limit of s / t, it can be ensured that the protection patch 5 has sufficient coverage area for the explosion-proof valve 31, so that the protection patch 5 can achieve reliable protection for the explosion-proof valve 31.

[0202] In this embodiment, the area t of the region enclosed by the circumferential edge of the cover plate 33 has a value range of: 2000 mm 2 ≤t≤20000mm 2 The area t of the area enclosed by the circumferential edge of the cover plate 33 can be 2000 mm 2 or 4000mm 2 or 8000mm 2 or 12000mm 2 or 15000mm 2 or 17000mm 2 or 18000mm 2 or 20000mm 2 wait.

[0203] In some embodiments, in combination Fig. 9 As shown, the battery assembly includes a cover plate 33, and the cover plate 33 is provided with a liquid injection hole 331. The minimum distance between the liquid injection hole 331 and the protective patch 5 is u, which satisfies: 5mm≤u≤54mm.

[0204] By limiting the lower limit of the minimum distance u between the injection hole 331 and the protective patch 5, the electrolyte can be injected through the injection hole 331, and the electrolyte can be prevented from flowing to the position of the protective patch 5 during the injection process, thereby ensuring the service life of the protective patch 5 and the explosion-proof valve 31. By limiting the upper limit of the minimum distance u between the injection hole 331 and the protective patch 5, the size of the cover plate 33 is prevented from being too large, and material waste is prevented.

[0205] In some embodiments, in combination Fig.11 As shown, at least part of the notch 51 is not in a straight line, so that the protective patch 5 forms at least one cantilever portion 52; the cantilever portion 52 includes a first endpoint 501 and a second endpoint 502, at least part of the notch 51 is continuous from the first endpoint 501 to the second endpoint 502, the area of ​​the cantilever portion 52 is v, and the area of ​​the cantilever portion 52 is the area enclosed by the line between the first endpoint 501 and the second endpoint 502 and the notch 51 between the first endpoint 501 and the second endpoint 502, satisfying: 1.1mm 2 ≤v≤12.5mm 2 .

[0206] The protective patch 5 is scored with notches 51 to form at least one cantilever portion 52; the area of ​​the cantilever portion 52 can be considered to be the area enclosed by the notch segments forming each cantilever portion 52 and the line connecting the two points of the notch segments. For example, a cantilever portion 52 may include two intersecting notch segments, so that the two intersecting notch segments form a triangular cantilever portion. In this case, the area of ​​the cantilever portion 52 is the area of ​​the triangle; or, a cantilever portion 52 may include a semicircle, that is, a semicircular cantilever portion is formed. In this case, the area of ​​the cantilever portion 52 is the area of ​​the semicircle. For example, Fig.11 In the structure shown, the notch 51 is a curve, and the area of ​​the cantilever portion 52 is the area v shown in the figure. Fig.10 In the structure shown, the notches 51 are cross lines, and four cantilever portions 52 are formed around the cross lines. When there are multiple cantilever portions 52, the area of ​​each cantilever portion 52 is v.

[0207] By limiting the upper limit of the area of ​​the cantilever portion 52, it is possible to ensure that the notch 51 is in a closed state under normal conditions, that is, to ensure that the notch 51 can reliably seal the gas storage chamber formed by the protective patch 5, the explosion-proof valve 31 and the support portion 32 under normal conditions, thereby preventing the protective patch 5 from sagging and foreign matter from entering the explosion-proof valve 31, thereby improving the safety performance of the battery.

[0208] At the same time, by limiting the lower limit of the area of ​​the cantilever portion 52, it is ensured that during the airtightness test, the notch 51 can be opened smoothly, that is, the cantilever portion 52 formed by the notch 51 can be opened under a preset pressure, which is used to perform airtightness test on the battery and improve the test efficiency and accuracy of the airtightness test. At the same time, the protection patch 5 will not be deformed too much when it is opened, and will not affect the long-term normal use of the protection patch 5, thereby improving the service life of the protection patch 5.

[0209] In some embodiments, in combination Fig.15 As shown, the projection of the slit portion 11 toward the protective patch 5 at least partially overlaps with the notch 51. This ensures that the high-heat medium can be discharged smoothly and the gas conduction is faster.

[0210] In some other embodiments, the projection of the slit portion 11 toward the protective patch 5 does not overlap with the notch 51 , and the minimum distance between the projection of the slit portion 11 on the protective patch 5 and the notch 51 is w, satisfying: w≤30 mm.

[0211] By ensuring that the projection of the slit 11 toward the protective patch 5 does not overlap with the notch 51 , foreign matter such as electrolyte, water, metal filings, dust, etc. can be prevented from easily entering the gas storage chamber formed by the protective patch 5 , the explosion-proof valve 31 and the support portion 32 through the slit 11 .

[0212] By limiting the upper limit of the minimum distance between the projection of the slit portion 11 on the protective patch 5 and the notch 51 , it is avoided that the distance is too far, which is not conducive to the expansion of the slit portion 11 due to heat.

[0213] In some embodiments, the battery assembly further includes: an insulating top plate 4 disposed between the cover plate 33 and the harness plate 1;

[0214] In the direction perpendicular to the plane of the wiring harness plate, the distance between the surface of the insulating top plate close to the wiring harness plate and the cover plate body is K1, and the distance between the surface of the protective patch close to the wiring harness plate and the cover plate body is K2, satisfying: 0.9≤K1 / K2≤1.1.

[0215] Preferably, the surface of the insulating top plate 4 close to the wiring harness plate 1 is flush with the surface of the protective patch 5 close to the wiring harness plate 1 .

[0216] By making 0.9≤K1 / K2≤1.1, the insulating top plate 4 and the protective patch 5 can jointly support the wiring harness board 1, thereby ensuring the supporting effect of the wiring harness board 1, and providing soft support to avoid damage to the wiring harness board 1.

[0217] In some embodiments, the support portion 32 includes a metal material, and the insulating top plate 4 includes a plastic material.

[0218] The support portion 32 has better support strength than the insulating top plate 4 and has a better support effect on the middle portion of the wiring harness plate 1 , which is conducive to outward expansion from the slit portion 11 after the high-temperature medium is sprayed out.

[0219] In some embodiments, in combination Figure 3 As shown, the wiring harness board 1 includes a wiring harness board body 10, and a collection branch 12 formed in at least a part of the wiring harness board 1, a cutting seam 13 is opened between the wiring harness board body 10 and the collection branch 12, and along the width direction perpendicular to the slit portion 11, the vertical distance from the root where the cutting seam 13 and the main road are connected to the edge of the slit portion 11 close to the root is x, satisfying: 5mm≤x≤30mm.

[0220] The root of the connection between the cutting seam 13 and the main line refers to the area where the collection branch line 12 is connected to the wiring harness board body 10 .

[0221] By limiting the lower limit of the minimum spacing between the cutting seam 13 and the slit portion 11, it is avoided that the cutting seam 13 and the slit portion 11 are too close to each other, thereby preventing the main body strength of the wiring harness plate body 10 from being insufficient, and the cutting seam 13 and the slit portion 11 from being too small to facilitate wiring arrangement.

[0222] By limiting the upper limit of the minimum distance between the cutting seam 13 and the slit portion 11 , material waste caused by the overall size of the wiring harness plate 1 being too large can be avoided.

[0223] In some embodiments, when the projection of the cutting seam 13 toward the first surface at least partially overlaps with the explosion-proof valve 31 , the following condition is satisfied: 2 mm ≤ b ≤ 20 mm.

[0224] When the projection of the cutting slit 13 toward the first surface at least partially overlaps with the explosion-proof valve 31 , the high-temperature medium can also be sprayed out from the cutting slit 13 . At this time, the width of the slit portion 11 can be appropriately reduced.

[0225] In some embodiments, in combination Figure 3 As shown, the length direction of the slit portion 11 is parallel to the length direction of the harness plate 1 , and along the width direction of the slit portion 11 , the overall width of the harness plate 1 is z, satisfying: 0.1≤y / z≤0.8.

[0226] When the ratio of the width of the cutting seam 13 to the overall width of the wiring harness plate 1 is too large, the width of the cutting seam 13 is too large, leaving less wiring space for the wiring harness plate 1; and when the ratio of the width of the cutting seam 13 to the overall width of the wiring harness plate 1 is too small, the width of the cutting seam 13 is too small, which is not conducive to the rapid diffusion of high-heat media.

[0227] In some embodiments, in combination Fig.12 As shown, the wiring harness plate 1 further includes a fuse 14. Along the width direction of the slit portion 11, the minimum distance between the fuse 14 and the slit portion 11 is A, which satisfies: 1mm≤A≤10mm.

[0228] When the minimum distance A between the fuse 14 and the slit portion 11 is lower than the lower limit, the fuse 14 is too close to the slit portion 11, that is, the fuse 14 is close to the explosion-proof valve 31, and the high-temperature medium may damage the fuse 14 after the explosion-proof valve 31 opens, and the fuse 14 cannot protect the line of the wiring harness board 1. When the minimum distance A between the fuse 14 and the slit portion 11 is higher than the upper limit, the fuse 14 is too close to the slit portion 11, that is, the fuse 14 is too far from the explosion-proof valve 31, which increases the product size and makes the product difficult to implement.

[0229] A plurality of core conductive wires 16 are arranged inside the wiring harness board 1 , and the core conductive wires 16 may be copper wires. The fuse 14 is formed by a portion of the core conductive wire 16 with a reduced wire diameter.

[0230] When the distance between the fuse 14 and the collecting branch 12 is closer, the response is faster and the safety performance is better.

[0231] In some other embodiments, the preferred range of A can be selected as 2mm≤A≤9mm.

[0232] In some embodiments, the wire diameter of the fuse 14 is B, which satisfies: 0.1 mm≤B≤0.3 mm.

[0233] The wire diameter of the fuse 14 determines its minimum fusing current, wherein the minimum fusing current = the minimum acceptable voltage / the loop battery resistance.

[0234] By limiting the wire diameter parameters of the fuse 14 , it is possible to ensure that the fuse 14 blows quickly when a short circuit occurs, thereby improving safety performance.

[0235] In some embodiments, fuse 14 is of S type.

[0236] In some embodiments, the length of the fuse 14 is D, which satisfies: 0.16≤D / b≤10.

[0237] Since the fuse 14 needs to meet a fixed minimum fusing current, the wire diameter of the fuse 14 is fixed. At this time, the length of the fuse 14 affects the fusing time. If the ratio of the length D of the fuse 14 to the width of the slot 11 is too small, it means that the width of the slot 11 is too large and the fuse is too short, the fusing time is too short, and the fusing time requirement is not met; if the ratio is too large, it means that the width of the slot 11 is too small and the fuse is too long, the fusing time is too long, and the fusing time requirement is also not met.

[0238] Since the fuse is formed by stretching and thinning the core conductive wire 16 on the main circuit, when the single core conductive wire 16 is thinner, the fuse length will be shorter after the fuse with a fixed wire diameter is stretched by a thinner main body.

[0239] At this time, the wider the width of the slit 11, the smaller the overall wiring space of the wiring harness board 1. When the number of collections is fixed, that is, the number of wirings is fixed, the thinner the single core conductive wire 16 is, the shorter the length of the corresponding fuse is, and the faster the melting time is.

[0240] However, the fuse length cannot be too short, otherwise the fusing time requirement will not be met.

[0241] That is, the smaller the ratio of the length of the fuse 14 to the width of the slit 11, the shorter the length of the fuse 14, the wider the width of the slit 11, that is, the thinner the single core conductive wire 16, the faster the fuse's fusing time is, and when the fusing time requirement is met, the faster the fuse's fusing time is, the better. Conversely, the larger the ratio of the length of the fuse 14 to the width of the slit 11, the longer the length of the fuse 14, the smaller the width of the slit 11, that is, the thicker the single core conductive wire 16, the slower the fuse's fusing time is, and if it exceeds a certain limit, a safety hazard is likely to occur.

[0242] In some embodiments, the length of the fuse 14 is D, which satisfies: 8 mm ≤ D ≤ 15 mm.

[0243] Since the fuse 14 needs to meet a fixed minimum fusing current, the wire diameter of the fuse 14 is fixed. At this time, the length of the fuse 14 affects the fusing time. If the length of the fuse 14 is too long, it means that the core conductive wire 16 of the main circuit is thicker, which is not conducive to saving materials and reducing costs or saving space. However, the length of the fuse 14 cannot be too short, otherwise it will not meet the fusing time requirement.

[0244] In some embodiments, the wiring harness plate 1 further includes a core conductive wire 16 and a protective film 15 covering the core conductive wire 16. The number of the core conductive wires 16 is defined as E, the wire diameter of the core conductive wire 16 is defined as F, and the overall width of the wiring harness plate 1 along the width direction of the slit portion 11 is defined as z, satisfying:

[0245] 0.05≤(E·F / z) / b≤15; and satisfying: 1mm≤b≤60mm; 3≤E·F≤15.

[0246] In the relationship (E·F / z) / b, the physical meaning of the numerator is the proportion of the width of the core conductive wire 16 in the wiring harness plate 1, and the denominator is the width of the slit 11. Since the width of the slit 11 is affected by the distance between the positive and negative poles of the battery and is within a fixed range; if the ratio is too large, it means that the proportion of the width of the core conductive wire 16 in the wiring harness plate 1 is too large, and the width of the slit 11 is too small. Since the melting point of the core conductive wire 16 is generally high, the core conductive wire 16 will generally not melt after the explosion-proof valve is opened, so a large area of ​​the core conductive wire 16 will cover the explosion-proof valve area, affecting the rapid opening of the explosion-proof valve; if the ratio is too small, it means that the proportion of the width of the core conductive wire 16 in the wiring harness plate 1 is too small and the width of the slit 11 is too large, which can easily cause the explosion-proof plate to fly out.

[0247] In some embodiments, in a direction perpendicular to the wiring harness plate 1 , the thickness of the protection film 15 is G, which satisfies: 0.2≤G / b≤4.17.

[0248] The thicker the protective film 15 is, the less likely it is to shrink due to heat, and the slower the slit widening speed of the slit portion 11 is, so the initial width of the slit portion 11 should be larger. Conversely, the thinner the protective film 15 is, the easier it is to shrink due to heat, and the faster the slit widening speed of the slit portion 11 is, so the initial width of the slit portion 11 can be appropriately smaller.

[0249] In this embodiment, 1 mm ≤ b ≤ 60 mm is selected. The thickness G of the single-layer protective film 15 may be in the range of 25 micrometers ≤ G ≤ 200 micrometers.

[0250] In some embodiments, the slit portion 11 is formed by a gap between two adjacently disposed wiring harness plates 1 .

[0251] In some other embodiments, the slit portion 11 is formed by hollowing out at least a portion of a wiring harness plate 1 .

[0252] In some embodiments, a plurality of battery cells 3 are stacked to form a battery column 2 , and the slit portion 11 extends continuously along the stacking direction of the battery cells 3 .

[0253] In some other embodiments, a plurality of battery cells 3 are stacked to form a battery column 2 , and the wiring harness plate 1 is provided with a plurality of slits 11 along the stacking direction of the battery column 2 , and a spacing portion 17 is formed between two adjacent slits 11 .

[0254] By forming the spacer 17 between two adjacent slits 11 , the overall strength of the wire harness plate 1 can be improved.

[0255] In this embodiment, the gap between two adjacent battery cells 3 is arranged corresponding to the spacing portion 17 .

[0256] The gap between two adjacent battery cells 3 is arranged corresponding to the spacing part, which can prevent dust from falling and entering the gap between two adjacent battery cells 3, thereby improving safety performance and improving the overall strength of the wiring harness plate 1.

[0257] In some embodiments, the thickness of the wiring harness plate 1 is H, satisfying: 0.08 mm ≤ H ≤ 0.335 mm;

[0258] The temperature resistance performance parameters of the wiring harness board 1 meet: -40℃~85℃ (1000h); the specific test method for the temperature resistance performance of the wiring harness board 1 is as follows:

[0259] ① Low temperature test: Place at -40℃ for 1000 hours. During the test, check the appearance of the glue on the samples every 250h, 500h and 1000h, test the resistance of each NTC at room temperature and record the ambient temperature (note that the FPC should be placed at room temperature for 10min, and the resistance test should be carried out after the FPC temperature is the same as room temperature). Each resistance test should be completed within 24±2h.

[0260] ② High temperature test: Place at 85℃ for 1000 hours. During the test, check the appearance of the glue on the samples every 250h, 500h and 1000h, test the resistance of each NTC at room temperature and record the ambient temperature (note that the FPC should be placed at room temperature for 10min, and the resistance test should be carried out after the FPC temperature is the same as room temperature). Each resistance test should be completed within 24±2h.

[0261] After the low temperature test, the FPC performance meets the insulation withstand voltage requirements. There is no damage on the appearance, no breakage, no glue cracking and other defects. After the test, the NTC resistance at 25°C is tested and compared with the corresponding resistance in the RT table. The error is required to be ≤±1°C.

[0262] After the high temperature test, the FPC performance meets the insulation withstand voltage requirements. There is no damage on the appearance, no breakage, no glue cracking and other defects. After the test, the NTC resistance value at 25°C is tested and compared with the corresponding resistance value in the RT table. The error is required to be ≤±1°C.

[0263] The insulation performance parameters of the wiring harness board 1 meet the following requirements: ① The insulation resistance and withstand voltage leakage current between the FPC acquisition lines meet the following requirements: insulation resistance ≥ 100MΩ@1000VDC (60S), withstand voltage leakage current ≤ 1mA@1000VDC (60S), and there is no flashover or breakdown during the test;

[0264] ②The insulation resistance and withstand voltage leakage current between FPC and the insulation layer meet the following requirements: insulation resistance ≥500MΩ@1000VDC (60S), withstand voltage leakage current ≤1mA@2800VDC (60S).

[0265] The specific test method for the insulation performance of the wiring harness board 1 is as follows:

[0266] ① The test method for the insulation resistance, withstand voltage and leakage current between each FPC collection line is as follows: 1. Adjust the voltage value of the insulation withstand voltage tester to 1000VDC, test the insulation resistance between adjacent collection lines through the connector, read the measured resistance value and record it. 2. Adjust the voltage value of the insulation withstand voltage tester to 1000VDC, test the withstand voltage leakage current value between adjacent collection lines through the connector, read the leakage current value and record it (Note: the positive and negative circuits of the same NTC should be combined into one wire, and multiple wires of the same collection point should be combined into one wire).

[0267] ②The test method for the insulation resistance and withstand voltage leakage current between the FPC and the insulation layer is as follows: 1. Adjust the voltage value of the insulation withstand voltage tester to 1000VDC, test the insulation resistance between any FPC acquisition line and the outer surface of the FPC insulation layer, read the measured resistance value and record it. 2. Adjust the voltage value of the insulation withstand voltage tester to 2800VDC, test the withstand voltage leakage current value between any FPC acquisition line and the outer surface of the FPC insulation layer, read the measured leakage current value and record it. (Note: The positive and negative circuits of the same NTC should be combined into one wire, and multiple wires of the same acquisition point should be combined into one wire).

[0268] In some embodiments, the battery cell 3 includes a shell 35 , the shell 35 is a steel shell, and the size a of the residual portion 311 satisfies: 10 mm ≤ a ≤ 15 mm;

[0269] And it satisfies: 0.033≤b / a≤2.

[0270] The shell 35 is a steel shell. Since steel has a high melting point and high hardness, the valve opening pressure is high. The high gas pressure after the valve is opened has a greater impact on the wiring harness plate 1. At this time, the width of the slit 11 can be appropriately reduced.

[0271] The residual portion 311 can be appropriately enlarged, and the residual portion 311 is more connected to other areas of the shell or the cover plate. After the explosion-proof plate is subjected to force, it is less likely to break the residual portion 311 and cause the explosion-proof plate to fly out.

[0272] In some other embodiments, the battery cell 3 includes a shell 35 , and the shell 35 is an aluminum shell.

[0273] In some embodiments, the battery cell 3 includes a pole 34, and the pole 34 and the explosion-proof valve 31 are arranged on the same side surface of the battery cell 3, the explosion-proof valve 31 is located between the poles 34 of the two polarities, and the explosion-proof valve 31 and the pole 34 are arranged at intervals; the length dimension of the first surface is defined as L, satisfying: 0.05≤c / L≤12, and 0.008≤b / c≤3.

[0274] Since the pole 34 and the explosion-proof valve 31 are arranged on the same side surface of the battery cell 3, the explosion-proof valve 31 is located between the poles 34 of the two polarities, and the explosion-proof valve 31 and the pole 34 are arranged at intervals; when the explosion-proof valve 31 is opened, it is not desired that the high-temperature medium spray onto the pole to avoid further triggering a short circuit and heat spread, so the space reserved for the explosion-proof valve 31 and the wiring harness plate 1 located above the explosion-proof valve 31 is limited, the explosion-proof valve 31 and the wiring harness plate 1 will not be too wide, and in order to achieve a weight loss ratio in a short time, the area of ​​the explosion-proof valve 31 cannot be too small, so by limiting the lower limit of c / L, the insufficient valve opening area caused by the small area of ​​the explosion-proof valve 31 is avoided, and by limiting the upper limit of c / L, the distance between the explosion-proof valve 31 and the pole is avoided to be too close, so as to prevent the high-temperature medium from spraying onto the pole.

[0275] The upper limit of b / c is further limited to avoid the width of the slit 11 being too large, thereby preventing insufficient wiring space when the wiring harness plate 1 itself has a limited width; by limiting the lower limit of b / c, the width of the slit 11 is prevented from being too small, which is not conducive to pressure relief.

[0276] In some other embodiments, the battery cell 3 includes a pole 34, and the pole 34 and the explosion-proof valve 31 are arranged on different side surfaces of the battery cell 3; along the width direction of the slit 11, the overall width of the wiring harness plate 1 is z, satisfying: 10mm≤z≤250mm; and 0.004≤b / c≤3.

[0277] Since the pole 34 and the explosion-proof valve 31 are arranged on different side surfaces of the battery cell 3, when the explosion-proof valve 31 is opened, there is no space limitation of the pole, and the high-heat medium will not be sprayed onto the pole, so the range of c / L can be appropriately adjusted. The upper limit of b / c is further defined to avoid the width of the slit 11 being too large, and to avoid the situation of insufficient wiring space when the width of the wiring harness plate 1 itself is limited; by defining the lower limit of b / c, the width of the slit 11 is prevented from being too small, which is not conducive to pressure relief.

[0278] As one implementation form, the explosion-proof valve 31 is disposed on the top surface of the battery cell 3 .

[0279] When the explosion-proof valve 31 is disposed on the top surface of the battery cell 3, the width of the slit 11 can be appropriately increased in order to prevent the heat from being excessively concentrated and accumulating to break through the box cover or even reach the passenger compartment in order to diffuse the heat quickly.

[0280] As another implementation form, the explosion-proof valve 31 is arranged on the side of the battery cell 3 .

[0281] When the explosion-proof valve 31 is arranged on the side of the battery cell 3, since the safety risk on the side is lower, it is not easy for the heat to accumulate too much and break through the box cover or even reach the passenger compartment. Therefore, the high-heat medium is allowed to concentrate to a certain extent, and the width of the slit 11 can be appropriately reduced.

[0282] In this embodiment, the overall width z of the wiring harness plate 1 can be 10mm or 15mm or 20mm or 40mm or 50mm or 60mm or 75mm or 85mm or 100mm or 120mm or 160mm or 170mm or 190mm or 200mm or 220mm or 230mm or 250mm, or it can be an interval formed by any two of the above values.

[0283] In some embodiments, the battery cell 3 includes a cover plate 33, which is provided with a liquid injection hole 331, and the projection of the slit portion 11 on the cover plate 33 does not overlap with the liquid injection hole 331; and the minimum distance between the projection of the slit portion 11 on the cover plate 33 and the liquid injection hole 331 is I, satisfying: 5mm≤I≤188mm.

[0284] By making sure that the projection of the slit 11 on the cover plate 33 does not overlap with the liquid injection hole 331 , foreign matter such as electrolyte, water, metal chips, and dust can be prevented from falling from the slit 11 onto the liquid injection hole 331 , thereby preventing the liquid injection hole 331 from being damaged.

[0285] By limiting the lower limit of the minimum distance between the projection of the slit portion 11 on the cover plate 33 and the injection hole 331, erosion of the injection hole 331 by foreign matter can be avoided. At the same time, by limiting the upper limit of the minimum distance between the projection of the slit portion 11 on the cover plate 33 and the injection hole 331, the overall size parameters of the battery can be reasonably controlled to avoid unreasonable layout and waste of materials.

[0286] In this embodiment, the minimum spacing I between the projection of the slit 11 on the cover plate 33 and the injection hole 331 can be 5mm or 10mm or 15mm or 20mm or 40mm or 50mm or 60mm or 75mm or 85mm or 100mm or 120mm or 160mm or 170mm or 188mm, or it can be an interval formed by any two of the above values.

[0287] In some embodiments, the battery capacity of the battery cell 3 is defined as J, which satisfies: 0.0004 mm / Ah≤b / J≤0.5 mm / Ah.

[0288] Since the battery capacity is related to the weight loss ratio that needs to be achieved when the explosion-proof valve is opened, the larger the battery capacity is, the wider the width of the slit portion 11 needs to be, so as to avoid failing to achieve the weight loss ratio requirement.

[0289] In some embodiments, the battery cell 3 includes a shell 35, which has an opening. The battery cell 3 also includes a cover plate 33 covering the opening. The cover plate 33 and the shell 35 together form a accommodating cavity. The length of the accommodating cavity ranges from 100 mm to 380 mm; the width of the accommodating cavity ranges from 50 mm to 250 mm; and the thickness of the accommodating cavity ranges from 15 mm to 100 mm.

[0290] According to an embodiment of the present invention, on the other hand, there is also provided a battery pack, comprising: the battery assembly as described above;

[0291] The bottom plate is provided with the battery cell 3 placed on the bottom plate, and the wiring harness plate 1 is provided on the side of the battery cell 3 facing away from the bottom plate.

[0292] Obviously, the above embodiments are only examples for clear explanation, and are not intended to limit the implementation methods. Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may 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 present invention.

Claims

1. A battery assembly, characterized in that: include: A battery cell (3) having a shell (35), wherein the shell (35) is provided with an explosion-proof valve (31); a first surface is defined as a side of the shell (35) provided with the explosion-proof valve (31); the explosion-proof valve (31) comprises a non-closed thinning portion (312), wherein the thinning portion (312) is suitable for allowing the internal gas of the battery cell (3) to release pressure by breaking through the thinning portion (312); and a residual portion (311) located in a non-closed area of ​​the thinning portion (312), wherein the thinning portion (312) and the residual portion (311) are together enclosed to form a continuous closed loop pattern; along a direction perpendicular to the first surface, the thickness of the residual portion (311) is greater than the thickness of the thinning portion (312); A wiring harness plate (1), the wiring harness plate (1) comprising an information collection component, adapted to collect the battery temperature and / or voltage of at least one of the battery cells (3); located on a side of the battery cell (3) provided with the explosion-proof valve (31); the wiring harness plate (1) is formed with a slit portion (11), the slit portion (11) being arranged through the upper and lower surfaces of the wiring harness plate (1) to form a slit; a projection of the slit portion (11) toward the first surface at least partially overlaps with the explosion-proof valve (31); The two ends of the thinned portion (312) form a first end and a second end, the area between the first end and the second end of the thinned portion (312) forms the residual portion (311), the straight-line distance between the first end and the second end is defined as the dimension a of the residual portion (311), along the width direction of the slit portion (11), the width of the slit portion (11) is defined as b, and the dimension of the explosion-proof valve (31) is defined as c, satisfying: c>b, and 0.01≤b / a≤12; The size a of the residual portion (311) ranges from 5 mm to 50 mm; The width b of the slit portion (11) has a value ranging from 0.5 mm to 60 mm.

2. The battery assembly according to claim 1, characterized in that: The explosion-proof valve (31) comprises a continuous thinned portion (312), and the thinned portion (312) and the residual portion (311) together enclose a continuous closed loop pattern.

3. The battery assembly according to claim 1, characterized in that: The projection of the slit portion (11) on the plane where the first surface is located at least partially overlaps with the residual portion (311); along the width direction of the slit portion (11), the width b of the slit portion (11) satisfies: 10 mm ≤ b ≤ 50 mm; and satisfies: 0.25 ≤ b / a ≤ 10.

4. The battery assembly according to claim 1, characterized in that: The projection of the slit portion (11) toward the first surface completely covers the residual portion (311); along the width direction of the slit portion (11), the width b of the slit portion (11) satisfies: 2 mm ≤ b ≤ 10 mm; and satisfies: 0.2 ≤ b / a ≤ 2.

5. The battery assembly according to claim 1, characterized in that: The projection of the slit portion (11) toward the first surface does not overlap with the residual portion (311); along the width direction of the slit portion (11), the width b of the slit portion (11) satisfies: 0.5 mm ≤ b ≤ 20 mm; and satisfies: 0.012 ≤ b / a ≤ 4.

6. The battery assembly according to any one of claims 1 to 5, characterized in that: The length direction of the slit portion (11) is parallel to the length direction of the wiring harness plate (1); along the width direction of the slit portion (11), the slit portion (11) is located in the middle of the wiring harness plate (1), and the projection of the slit portion (11) toward the first surface overlaps with the center position of the explosion-proof valve (31).

7. The battery assembly according to any one of claims 1 to 5, characterized in that: The length direction of the slit portion (11) is parallel to the length direction of the wiring harness plate (1), and along the width direction of the slit portion (11), the vertical distance between the edge of one side of the slit portion (11) close to the center line of the wiring harness plate (1) and the center line of the wiring harness plate (1) is d, satisfying: 0.5 mm ≤ d ≤ 20 mm.

8. The battery assembly according to claim 1, characterized in that: The length direction of the explosion-proof valve (31) is parallel to the length direction of the first surface, and the length direction of the slit portion (11) is perpendicular to the length direction of the residual portion (311), satisfying: 1mm≤b≤60mm.

9. The battery assembly according to claim 1, characterized in that: The length direction of the explosion-proof valve (31) is parallel to the thickness direction of the battery cell (3), and the length direction of the slit portion (11) is parallel to the length direction of the residual portion (311), satisfying: 0.5 mm ≤ b ≤ 40 mm.

10. The battery assembly according to claim 1, characterized in that: A plurality of battery cells (3) are stacked to form a battery row (2); the stacking direction of the battery row (2) is parallel to the width direction of the first surface; the length direction of the residual portion (311) is parallel to the width direction of the first surface; along the length direction of the first surface, the residual portions (311) of the explosion-proof valves (31) of two adjacent battery cells (3) are arranged away from each other; the length direction of the slit portion (11) is parallel to the width direction of the first surface; along the width direction of the slit portion (11), the width b of the slit portion (11) satisfies: 0.5 mm ≤ b ≤ 50 mm.

11. The battery assembly according to claim 10, characterized in that: In a direction perpendicular to the plane where the wiring harness plate (1) is located, the thickness of the wiring harness plate (1) is f, satisfying the following relationship: 140 micrometers ≤ f ≤ 185 micrometers.

12. The battery assembly according to claim 1, characterized in that: A plurality of battery cells (3) are stacked to form a battery row (2); based on the current placement positions of the battery cells (3), the residual portions (311) of the explosion-proof valves (31) of two adjacent battery cells (3) are arranged at the same position on the first surface; the length direction of the slit portion (11) is parallel to the width direction of the first surface; and along the width direction of the slit portion (11), the width b of the slit portion (11) satisfies: 1 mm ≤ b ≤ 60 mm.

13. The battery assembly according to claim 12, characterized in that: In a direction perpendicular to the plane where the wiring harness plate (1) is located, the thickness of the wiring harness plate (1) is f, satisfying the following relationship: 155 micrometers ≤ f ≤ 235 micrometers.

14. The battery assembly according to claim 1, characterized in that: A plurality of battery cells (3) are stacked to form a battery row (2); the length direction of the residual portion (311) is parallel to the length direction of the first surface; along the width direction of the first surface, the residual portion (311) of the explosion-proof valve (31) of one of the battery cells (3) is arranged close to the residual portion (311) of the explosion-proof valve (31) of the battery cell (3) on one side, and is arranged away from the residual portion (311) of the explosion-proof valve (31) of the battery cell (3) on the other side; the length direction of the slit portion (11) is parallel to the width direction of the first surface; along the width direction of the slit portion (11), the width b of the slit portion (11) satisfies: 1 mm ≤ b ≤ 50 mm.

15. The battery assembly according to claim 14, characterized in that: In a direction perpendicular to the plane where the wiring harness plate (1) is located, the thickness of the wiring harness plate (1) is f, satisfying the following relationship: 185 micrometers ≤ f ≤ 335 micrometers.

16. The battery assembly according to claim 1, characterized in that: The housing (35) comprises a cover plate (33), and the explosion-proof valve (31) is arranged on the cover plate (33) and is located on a side surface of the cover plate (33) facing the wiring harness plate (1) or a side surface facing away from the wiring harness plate (1); The cover plate (33) is also provided with a support portion (32) on the outer peripheral side surrounding the explosion-proof valve (31); the support portion (32) extends toward the wiring harness plate (1) and is suitable for supporting the wiring harness plate (1).

17. The battery assembly according to claim 16, characterized in that: The explosion-proof valve (31) is arranged on a side surface of the cover plate (33) facing away from the wiring harness plate (1), and the support portion (32) is supported between the wiring harness plate (1) and the explosion-proof valve (31) so that a gap portion (6) is formed between the wiring harness plate (1) and the explosion-proof valve (31).

18. The battery assembly according to claim 16, characterized in that: The support portion (32) is arranged on both sides of the explosion-proof valve (31) in the length direction, and extends along the width direction of the explosion-proof valve (31); And / or, the support portion (32) is arranged on both sides of the explosion-proof valve (31) in the width direction and extends along the length direction of the explosion-proof valve (31).

19. The battery assembly according to claim 16, characterized in that: The support portion (32) is arranged around the explosion-proof valve (31).

20. The battery assembly according to claim 19, characterized in that: The support portion (32) is of a runway type.

21. The battery assembly according to claim 16, characterized in that: The support portion (32) and the cover plate (33) are integrally formed; the cover plate (33) is a metal part.

22. The battery assembly according to claim 16, characterized in that: In a direction perpendicular to the plane where the cover plate (33) is located, the height of the support portion (32) protruding from the surface of the cover plate (33) toward one side of the wiring harness plate (1) is h, satisfying the following: 0.005≤h / b≤2.

23. The battery assembly according to claim 16, characterized in that: In a plane parallel to the cover plate (33), the distance between the surface of the support portion (32) close to the explosion-proof valve (31) and the surface of the support portion (32) away from the explosion-proof valve (31) is defined as the thickness j of the support portion (32), satisfying the following: 0.008≤j / b≤3.

24. The battery assembly according to claim 16, characterized in that: A protective patch (5) is provided between the slit portion (11) and the explosion-proof valve (31), the protective patch (5) being suitable for preventing impurities from falling onto the explosion-proof valve (31), and a projection of the slit portion (11) toward the first surface overlaps with the protective patch (5).

25. The battery assembly according to claim 24, characterized in that The wiring harness plate (1) comprises a wiring harness plate body (10), the thickness of the wiring harness plate body (10) is defined as m, the thickness of the protective patch (5) is defined as k, and the following conditions are satisfied: 0.29≤k / m≤2.

14.

26. The battery assembly according to claim 24, characterized in that The thickness of the protective patch (5) is defined as k, satisfying: 0.0016≤k / b≤0.

6.

27. The battery assembly according to claim 24, characterized in that The protective patch (5) is fixed to a side of the support portion (32) facing the wiring harness plate (1).

28. The battery assembly according to claim 24, characterized in that The projection of the protection patch (5) toward the first surface covers the thinned portion (312).

29. The battery assembly according to claim 24, characterized in that The support portion (32) is provided with an air guide groove (321), and a direction from a surface of the support portion (32) close to the explosion-proof valve (31) to a surface of the support portion (32) away from the explosion-proof valve (31) is defined as a thickness direction of the support portion (32); Along the thickness direction of the support portion (32), the air guide groove (321) penetrates the support portion (32); In a direction parallel to the plane where the explosion-proof valve (31) is located and perpendicular to the thickness of the support portion (32), the maximum width of the air guide groove (321) is n, satisfying the following conditions: 0.0016≤n / b≤2.

30. The battery assembly according to claim 29, characterized in that Along a direction perpendicular to the plane where the explosion-proof valve (31) is located, the maximum height of the air guide groove (321) is o, satisfying: 0.0016≤o / b≤1.

31. The battery assembly according to claim 29, characterized in that The projection of the slit portion (11) towards the first surface overlaps with the air guide groove (321), satisfying: 0.01≤n / b≤2.

32. The battery assembly according to claim 29, characterized in that The projection of the slit portion (11) toward the first surface does not overlap with the air guide groove (321), and satisfies: 0.0016≤n / b≤1.

9.

33. The battery assembly according to claim 29, characterized in that The air guide groove (321) is a V-shaped groove, and the opening cross-sectional area of ​​the support portion (32) gradually decreases from the side of the support portion (32) close to the wiring harness plate (1) to the side away from the wiring harness plate (1).

34. The battery assembly according to claim 29, characterized in that The protective patch (5) is adhesively connected to the support portion (32).

35. The battery assembly according to claim 34, characterized in that An adhesive layer for bonding is at least partially provided in the overlapping area between the protective patch (5) and the support portion (32), and a notch is partially formed in the adhesive layer in a direction perpendicular to the plane where the protective patch (5) is located so that the projection of the adhesive layer and the air guide groove (321) do not overlap.

36. The battery assembly according to claim 35, characterized in that In a thickness direction parallel to the plane where the protective patch (5) is located and perpendicular to the support portion (32), the width of the notch is p, satisfying the following: 2≤n / p≤5.

37. The battery assembly according to claim 24, characterized in that The protective patch (5) is provided with a notch (51), and the notch (51) runs through the protective patch (5) in a direction perpendicular to the plane where the protective patch (5) is located; the total length of the notch (51) is q, satisfying: 0.016≤q / b≤10.

38. The battery assembly according to claim 37, characterized in that The thickness of the protective patch (5) is k, which satisfies: 10≤q / k≤100, and 0.1mm≤k≤0.3mm.

39. The battery assembly according to claim 37, characterized in that In a direction perpendicular to the plane where the protective patch (5) is located, the area of ​​the region enclosed by the circumferential edge of the protective patch (5) is s; in a direction perpendicular to the plane where the cover plate (33) is located, the area of ​​the region enclosed by the circumferential edge of the cover plate (33) is t; satisfying: 300mm 2 ≤s≤1500mm 2 , and 0.015≤s / t≤0.

75.

40. The battery assembly according to claim 37, characterized in that The cover plate (33) is provided with a liquid injection hole (331), and the minimum distance between the liquid injection hole (331) and the protective patch (5) is u, satisfying: 5mm≤u≤54mm.

41. The battery assembly according to claim 37, characterized in that At least part of the notch (51) is not in a straight line, so that the protective patch (5) forms at least one cantilever portion (52); the cantilever portion (52) includes a first endpoint (501) and a second endpoint (502), at least part of the notch (51) is continuous from the first endpoint (501) to the second endpoint (502), the area of ​​the cantilever portion (52) is v, and the area of ​​the cantilever portion (52) is the area enclosed by the line between the first endpoint (501) and the second endpoint (502) and the notch (51) between the first endpoint (501) and the second endpoint (502), satisfying: 1.1 mm 2 ≤v≤12.5mm 2 .

42. The battery assembly according to claim 37, characterized in that The projection of the slit portion (11) towards the plane where the protective patch (5) is located at least partially overlaps with the notch (51).

43. The battery assembly according to claim 37, characterized in that The projection of the slit portion (11) toward the plane where the protective patch (5) is located does not overlap with the notch (51), and the minimum distance between the projection of the slit portion (11) on the plane where the protective patch (5) is located and the notch (51) is w, satisfying: w≤30 mm.

44. The battery assembly according to claim 24, characterized in that The battery assembly further comprises: an insulating top plate (4) disposed between the cover plate (33) and the wiring harness plate (1); In a direction perpendicular to the plane where the wiring harness plate (1) is located, the distance between the surface of the insulating top plate (4) close to the wiring harness plate (1) and the cover plate body is K1, and the distance between the surface of the protective patch (5) close to the wiring harness plate (1) and the cover plate body is K2, satisfying the following: 0.9≤K1 / K2≤1.

1.

45. The battery assembly according to claim 1, characterized in that The wiring harness plate (1) comprises a wiring harness plate body (10), and a collection branch (12) formed in at least a part of the wiring harness plate (1), a cutting slit (13) is provided between the wiring harness plate body (10) and the collection branch (12), and along a width direction perpendicular to the slit portion (11), a vertical distance x from a root where the cutting slit (13) and the main road are connected to an edge of the slit portion (11) close to the root is satisfied. 5 mm ≤ x ≤ 30 mm.

46. ​​The battery assembly according to claim 45, characterized in that When the projection of the cutting seam (13) toward the first surface at least partially overlaps with the explosion-proof valve (31), the following condition is satisfied: 2 mm ≤ b ≤ 20 mm.

47. The battery assembly according to claim 45, characterized in that The length direction of the slit portion (11) is parallel to the length direction of the wiring harness plate (1), and along the width direction of the slit portion (11), the overall width of the wiring harness plate (1) is z, satisfying: 0.1≤y / z≤0.

8.

48. The battery assembly according to claim 1, characterized in that The wiring harness plate (1) further comprises a fuse (14); along the width direction of the slit portion (11), a distance A between the fuse (14) and the slit portion (11) satisfies: 1 mm ≤ A ≤ 10 mm.

49. The battery assembly according to claim 48, characterized in that The wire diameter of the fuse (14) is B, satisfying: 0.1 mm ≤ B ≤ 0.3 mm.

50. The battery assembly according to claim 48, characterized in that The length of the fuse (14) is D, which satisfies: 0.16≤D / b≤10.

51. The battery assembly according to claim 48, characterized in that The length of the fuse (14) is D, which satisfies: 8 mm ≤ D ≤ 15 mm.

52. The battery assembly according to claim 48, characterized in that The wiring harness plate (1) further comprises a core conductive wire (16) and a protective film (15) covering the core conductive wire (16), wherein the number of the core conductive wires (16) is defined as E, the wire diameter of the core conductive wire (16) is defined as F, and along the width direction of the slit portion (11), the overall width of the wiring harness plate (1) is defined as z, satisfying the following: 0.05≤(E·F / z) / b≤15; and satisfying the following: 1mm≤b≤60mm; 3≤E·F≤15.

53. The battery assembly according to claim 52, characterized in that In a direction perpendicular to the wiring harness plate (1), the thickness of the protective film (15) is G, satisfying: 0.2≤G / b≤4.

17.

54. The battery assembly according to claim 1, characterized in that The slit portion (11) is formed by a gap between two adjacently arranged wiring harness plates (1).

55. The battery assembly according to claim 1, characterized in that The slit portion (11) is formed by hollowing out at least a portion of the wiring harness plate (1).

56. The battery assembly according to claim 1, characterized in that A plurality of the battery cells (3) are stacked to form a battery column (2), and the slit portion (11) extends continuously along the stacking direction of the battery cells (3).

57. The battery assembly according to claim 1, characterized in that A plurality of the battery cells (3) are stacked to form a battery column (2); the wiring harness plate (1) is provided with a plurality of slits (11) along the stacking direction of the battery column (2); and a spacing portion (17) is formed between two adjacent slits (11).

58. The battery assembly according to claim 57, characterized in that The gap between two adjacent battery cells (3) is arranged corresponding to the spacing portion (17).

59. The battery assembly according to claim 1, characterized in that The battery cell (3) comprises a shell (35), the shell (35) is a steel shell, and the size a of the residual portion (311) satisfies: 10 mm ≤ a ≤ 15 mm; and satisfies: 0.033 ≤ b / a ≤ 2.

60. The battery assembly according to claim 1, characterized in that The battery cell (3) comprises a shell (35), and the shell (35) is an aluminum shell.

61. The battery assembly according to claim 2, characterized in that The battery cell (3) comprises a pole (34), the pole (34) and the explosion-proof valve (31) are arranged on the same side surface of the battery cell (3), the explosion-proof valve (31) is located between the poles (34) of two polarities, and the explosion-proof valve (31) and the pole (34) are arranged at intervals; the length dimension of the first surface is defined as L, satisfying: 0.05≤c / L≤12, and 0.008≤b / c≤3.

62. The battery assembly according to claim 2, characterized in that The battery cell (3) comprises a pole (34), wherein the pole (34) and the explosion-proof valve (31) are arranged on different side surfaces of the battery cell (3); along the width direction of the slit portion (11), the overall width of the wiring harness plate (1) is z, satisfying: 10 mm ≤ z ≤ 250 mm; and 0.004 ≤ b / c ≤ 3.

63. The battery assembly according to claim 61, characterized in that The explosion-proof valve is arranged on the top surface of the battery cell (3).

64. The battery assembly according to claim 62, characterized in that The explosion-proof valve is arranged on the side of the battery cell (3).

65. The battery assembly according to claim 1, characterized in that The battery cell (3) comprises a cover plate (33), the cover plate (33) being provided with a liquid injection hole (331), the projection of the slit portion (11) on the plane where the cover plate (33) is located not overlapping the liquid injection hole (331); and the minimum spacing between the projection of the slit portion (11) on the plane where the cover plate (33) is located and the liquid injection hole (331) is I, satisfying: 5mm≤I≤188mm.

66. The battery assembly according to claim 1, characterized in that The battery capacity of the battery cell (3) is defined as J, which satisfies: 0.0004 mm / Ah≤b / J≤0.5 mm / Ah.

67. The battery assembly according to claim 1, characterized in that The battery cell (3) comprises a shell (35), the shell (35) being provided with an opening, the battery cell (3) further comprising a cover plate (33) covering the opening, the cover plate (33) and the shell (35) together enclosing a receiving cavity, the length of the receiving cavity being in the range of 100 mm to 380 mm, the width of the receiving cavity being in the range of 50 mm to 250 mm, and the thickness of the receiving cavity being in the range of 15 mm to 100 mm.

68. A battery pack, characterized in that: include: A battery assembly as claimed in any one of claims 1 to 67; A bottom plate, the battery cell (3) is placed on the bottom plate, and the wiring harness plate (1) is arranged on a side of the battery cell (3) facing away from the bottom plate.

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