Battery assembly and battery pack

Abstract

The application relates to the technical field of batteries, and discloses a battery assembly and a battery pack. The battery assembly comprises a battery monomer provided with an explosion-proof valve; a wire harness plate formed with a slotted part, the projection of the slotted part towards a first surface at least partially overlaps the explosion-proof valve; the size of a residual part is defined as a, the width of the slotted part is defined as b along the width direction of the slotted part, and the size of the explosion-proof valve is defined as c, and the following conditions are met: c > b, and 0.01 <= b / a <= 12. The battery assembly provided by the application limits the ratio of the width b of the slotted part to the size a of the residual part. When the ratio is too large, the slotted part is too wide and the residual part is too short, and the explosion-proof sheet is prone to flying out; and when the ratio is too small, the slotted part is too narrow and the residual part is too long, which is not conducive to the diffusion of high-temperature medium.

Description

Technical Field

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

[0002] When a battery experiences thermal runaway, it will produce a large amount of mixed gas and continuously accumulate pressure. By installing an explosion-proof valve on the battery cell, the pressure can be relieved and explosion-proof can be achieved.

[0003] In related technology, after multiple battery cells are stacked to form a battery pack, a flexible printed circuit board (FPC) is installed on the side of the battery cell where the terminal leads out. The FPC can sample and monitor battery voltage, temperature, and other information. By covering the explosion-proof valve with the FPC, the entire explosion-proof disc can be prevented from flying out. However, the FPC also blocks the discharge of thermal runaway gases, hindering 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 FPC cannot meet the diffusion requirements of high-heat media 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 having a housing provided with an explosion-proof valve; the side of the housing provided with the explosion-proof valve being defined as a first surface; the explosion-proof valve comprising a non-closed thinned portion, the thinned portion being adapted to allow internal gas of the battery cell to release pressure by breaking through the thinned portion; and a residual portion located in the non-closed region of the thinned portion, the thinned portion and the residual portion together enclosing a continuous closed loop; the residual portion being thicker than the thinned portion in a direction perpendicular to the first surface;

[0007] The wiring harness plate includes an information collection component adapted to collect battery temperature and / or voltage of a battery cell; the component is located on a side of the battery cell where the explosion-proof valve is provided; the wiring harness plate is formed with a slit portion extending through the upper and lower surfaces of the wiring harness plate to form a gap; a 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 its 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 opening of the explosion-proof valve.

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

[0011] By limiting 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 disk 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 medium.

[0012] In a second aspect, the present invention further provides a battery pack, comprising the battery assembly as described above; a base plate, battery cells are placed on the base plate, and a wiring harness plate is arranged on a side of the battery cells facing away from the base 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 embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

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

[0016] Figure 2 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 battery cell and the wiring harness plate of the present invention in a mating state;

[0018] Figure 4 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 Local magnification Figure 1 ;

[0021] Figure 7 for Figure 5 Local 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] Figure 9 is a schematic diagram of a cover plate of the present invention;

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

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

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

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

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

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

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

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

[0032] Figure 18 This is a schematic diagram of the case where the length direction of the residual parts of the adjacent battery cells is parallel to the length direction of the first surface. Figure 1 ;

[0033] Figure 19 This is a schematic diagram of the case where 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] Figure 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] Figure 21 This is a schematic diagram of the case where 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; 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. Terminal; 35. Housing;

[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] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying 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 making creative efforts shall fall 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," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on 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] To facilitate a clear description of the positional relationships of the various structures in the embodiments of the present invention, the directions and orientations are first defined. The surface of the housing 35 provided with the explosion-proof valve 31 is a first surface, the length of the slit 11 is a first direction, and the width of the slit 11 is a second direction. The first and second directions 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 is greater than the width direction of the slit formed through the wiring harness plate from top to bottom.

[0046] The following combination Figures 1 to 21 , describing embodiments 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 housing 35, which is provided with an explosion-proof valve 31. The side of the housing 35 provided with the explosion-proof valve 31 is defined as a first surface. The explosion-proof valve 31 includes a non-closed thinned portion 312, which is suitable for allowing the gas inside the battery cell 3 to break through the thinned portion 312 to release pressure; and a residual portion 311 located in the non-closed area of ​​the thinned portion 312. The thinned portion 312 and the residual portion 311 together form a continuous closed loop. In a direction perpendicular to the first surface, the thickness of the residual portion 311 is greater than the thickness of the thinned portion 312.

[0049] The wiring harness plate 1 includes an information collection component adapted to collect the battery temperature and / or voltage of at least one battery cell 3; the component 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, which extends 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 thinned portion 312, when thermal runaway of the battery cell 3 occurs, the explosion-proof valve 31 explodes along the path of the thinned portion 312, achieving exhaust. Furthermore, a residual portion 311 is provided, and its thickness, perpendicular to the plane of the explosion-proof valve 31, is greater than that of the thinned portion 312. As a result, when the explosion-proof valve 31 explodes along the path of the thinned portion 312, the residual portion 311 remains connected to other areas of the housing or cover plate, preventing the entire explosion-proof disk from flying out.

[0052] The wiring harness plate 1 is arranged on the side of the battery cell 3 where the explosion-proof valve 31 is provided, 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 disk from flying out.

[0053] At the same time, the wiring harness plate 1 is formed with a slit portion 11, the projection of which toward the battery cell 3 at least partially overlaps with the thinned portion 312; this prevents interference with the smooth opening of the explosion-proof valve 31 while ensuring smooth exhaust after the explosion-proof valve 31 has opened. Since the wiring harness plate 1 is a sheet, 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 closer to the battery cell 3. A gap is formed through the upper and lower surfaces of the wiring harness plate 1, thereby forming the slit portion 11.

[0054] By constraining 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 opening 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 has less connection with other areas of the shell or cover plate, and the explosion-proof disk is easily torn off the residual portion 311 after being subjected to force, causing the explosion-proof disk to fly out; when the dimension of the residual portion 311 is too large, the dimension of the thinned 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 the high-heat medium.

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

[0057] In one implementation, the explosion-proof valve 31 includes multiple discontinuous thinning portions 312, with residual portions 311 disposed between adjacent thinning portions 312. The multiple thinning portions 312 and the multiple residual portions 311 together form a continuous closed loop. For example, if the continuous closed loop is a runway shape, the paths along which the multiple thinning portions 312 are formed coincide with the runway shape.

[0058] As another implementation, explosion-proof valve 31 includes a continuous thinned portion 312. The two ends of thinned portion 312 form a first end and a second end. The area between the first and second ends of thinned portion 312 forms a residual portion 311. Thinned portion 312 and residual portion 311 together form a continuous closed loop. For example, if the continuous closed loop is a runway shape, the path of thinned portion 312 overlaps with the runway shape, while the path of 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. Figure 13 As shown, the residual portion 311 is linear, and the length of the residual portion 311 along the second direction is the dimension a of the residual portion 311 .

[0061] By limiting the ratio range of the width b of the slit portion 11 to the dimension 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 disk 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 can extend along a first direction or a second direction, wherein both the first direction and the second direction can be the 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 wiring harness plate 1. That is, for example, when the length direction of the wiring 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, with each slit 11 corresponding to the explosion-proof valve of a battery cell 3. Furthermore, the multiple slits 11 are all parallel to the second direction, and are arranged in parallel and spaced apart.

[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 can be 20 mm, 40 mm, 50 mm, 60 mm, 75 mm, 85 mm, 100 mm, or 120 mm, or can 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 can be 5 mm, 15 mm, 20 mm, 30 mm, 35 mm, 45 mm, or 50 mm, or it can 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 range 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 the interval range formed by any two of the above values.

[0068] To verify the opening performance of the explosion-proof valve 31, several examples and comparative examples are presented below. In the embodiments of the present invention, the explosion-proof valve 31 must meet the following opening performance criteria to pass the test: ① The valve opening time Δt (in seconds) must be within 60 seconds; ② The probability of valve opening (in %) must be greater than 55% at the preset valve opening pressure; and ③ The probability (in %) of the explosion-proof disc fully ejecting must be within 30%.

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

[0070] For example, the opening performance of the explosion-proof valve 31 can be tested using the following method:

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

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

[0074] ③ Observe whether the explosion-proof disk is completely ejected, and calculate the probability of the explosion-proof disk being completely ejected. The probability of the explosion-proof disk being completely ejected is calculated as: the number of batteries with the explosion-proof disk being completely ejected / 100.

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

[0076] Table 1

[0077]

[0078] In Examples 1 to 6, the width b of the slit 11 is within the preferred range, i.e., the preferred range for the width b of the slit 11 satisfies: 10 mm ≤ b ≤ 50 mm. The dimension a of the residual portion 311 is within the preferred range, i.e., the preferred range for the dimension a of the residual portion 311 satisfies: 5 mm ≤ a ≤ 40 mm. Furthermore, the ratio b / a is also within the preferred range, i.e., the preferred range for b / a satisfies: 0.25 ≤ b / a ≤ 10. Testing has shown that the opening performance of the explosion-proof valve 31 satisfies the following requirements: ① the valve opening time Δt (in seconds) is within 20 seconds; ② the probability of valve opening (in %) is greater than 84% at the preset valve opening pressure; and ③ the probability of the explosion-proof disc flying out (in %) is less than 10%. The explosion-proof valve 31 exhibits excellent opening performance.

[0079] In Examples 7 to 10, compared to Examples 1 to 6, the values ​​of b / a are within the preferred range, that is, the preferred range of b / a satisfies: 0.25 ≤ b / a ≤ 10. However, the values ​​of the width b of the slit portion 11 and the dimension a of the residual portion 311 are within the upper and lower limits, but not all within the preferred range. Testing has shown that the opening performance of the explosion-proof valve 31 meets the following requirements: ① The valve opening time Δt (in seconds) is within 35 seconds; ② The probability of valve opening (in %) is greater than 70% at the preset valve opening pressure; and ③ The probability of the explosion-proof disc flying out (in %) is less than 15%. The opening performance of the explosion-proof valve 31 is excellent.

[0080] In Examples 11 and 12, compared to Examples 1 through 6, the width b of the slit 11 is within the preferred range, satisfying the following conditions: 10 mm ≤ b ≤ 50 mm. The dimension a of the residual portion 311 is also within the preferred range, satisfying the following conditions: 5 mm ≤ a ≤ 40 mm. The ratio b / a is within the upper and lower limits, but not all values ​​are within the preferred range. Testing has shown that the opening performance of the explosion-proof valve 31 meets the following requirements: ① the valve opening time Δt (in seconds) is within 40 seconds; ② the probability of valve opening (in %) is greater than 65% at the preset valve opening pressure; and ③ the probability of the explosion-proof disc flying out (in %) is less than 20%. The opening performance of the explosion-proof valve 31 is excellent.

[0081] In Examples 13 and 14, compared to Examples 1 through 6, the values ​​of the width b of the slit 11 and the dimension a of the residual portion 311 are within the upper and lower limits, but not all within the preferred range. Similarly, the values ​​of b / a are within the upper and lower limits, but not all within the preferred range. Testing has shown that the opening performance of the explosion-proof valve 31 meets the following requirements: ① Valve opening time Δt (in seconds) is within 50 seconds; ② The probability of valve opening (in %) is greater than 60% at the preset valve opening pressure; and ③ The probability of the explosion-proof disc flying out (in %) is less than 25%. The opening performance of the explosion-proof valve 31 is acceptable.

[0082] In Examples 15 and 16, compared to Examples 1 through 6, the values ​​of the width b of the slit 11 and the dimension a of the residual portion 311 sometimes exceed the upper and lower limits, while the values ​​of b / a are within the upper and lower limits but not all within the preferred range. Testing has shown that the opening performance of the explosion-proof valve 31 meets the following requirements: ① Valve opening time Δt (in seconds) is within 60 seconds; ② The probability of valve opening (in %) at the preset valve opening pressure is greater than 55%; and ③ The probability of the explosion-proof disc flying out completely (in %) is less than 30%. This merely meets the minimum requirements for the opening performance of the explosion-proof valve 31 and the test is considered qualified.

[0083] In Comparative Examples 1 and 2, however, the values ​​of the width b of the slit 11 and the dimension a of the residual portion 311 exceed the upper and lower limits, and the value of b / a also exceeds the upper and lower limits. Testing shows that the valve opening performance of the explosion-proof valve 31 meets the following requirements: ① valve opening time Δt (in seconds) is greater than 60 seconds; ② the probability of valve opening (in %) is less than 55% at the preset valve opening pressure; and ③ the probability of the explosion-proof disc flying out (in %) is greater than 30%. However, the minimum requirements for the valve opening performance of the explosion-proof valve 31 are not 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, combined Figure 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 valve corresponding to the residual portion 311 is not opened, there is no high-heat medium erupting directly towards 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 should be appropriately larger, and the size of the residual portion 311 should 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, combined Figure 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: 2 mm ≤ b ≤ 10 mm;

[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 and the residual portion 311 are completely opposite each other, since the valve in the area corresponding to the residual portion 311 is not opened, no high-heat medium is ejected directly toward the slit portion 11. Therefore, 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 should be appropriately larger, while the size of the residual portion 311 should 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, combined Figure 15 or Figure 16 or Figure 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 11 toward the first surface does not overlap with the residual portion 311, that is, the slit 11 does not correspond to the residual portion 311, but rather corresponds to the thinned portion 312 of the explosion-proof valve 31. At this time, the high-heat medium erupts directly toward the slit 11, which facilitates rapid diffusion of the high-heat medium. The gap here expands rapidly, so the width of the slit 11 can be appropriately reduced. However, since the slit 11 will further expand after the high-heat medium erupts, the constraint of the slit 11 on the explosion-proof disc will become less. To prevent the explosion-proof disc from easily breaking the residual portion 311 after being subjected to force, causing the explosion-proof disc to fly out, the size of the residual portion 311 can be appropriately increased, which is more conducive to preventing the entire explosion-proof disc from flying out.

[0096] In this embodiment, the width b of the slit portion 11 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.

[0097] In some embodiments, combined Figure 12 As shown, 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 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 provided 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 11, by setting the slit 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 11 along the width direction is made equivalent, so that the number of branches of the core conductive wire 16 distributed on both sides of the slit 11 along the width direction is more even, which is more convenient for the arrangement of the wiring harness.

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

[0101] Combine 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, combined Figure 4 As shown, 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 vertical distance between the side edge 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: 0.5mm≤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 the 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 them, the number of wiring harnesses is more and more concentrated on the side where the width of the wiring harness plate 1 is larger, and the number of wiring harnesses is less on the side where the width of the wiring harness plate 1 is smaller, ensuring that the impact of the explosion-proof valve opening on the wiring harness is smaller.

[0105] When the vertical distance d between the edge of the slit 11 on the side closest to the center line of the wiring harness plate 1 and the center line of the wiring 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 more even, which makes it easier to arrange the wiring harness. This facilitates the placement of the slit 11 directly opposite the explosion-proof valve 31, ensuring smooth exhaust after the explosion-proof valve 31 explodes, and improving the eruption effect.

[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, combined Figure 13 or Figure 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 range formed by any two of the above values.

[0109] In some embodiments, combined Figure 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: 0.5 mm ≤ b ≤ 40 mm.

[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 horizontal when its length direction is parallel to the length direction of the first surface; and the explosion-proof valve 31 is described as being vertical when its length direction is parallel to the thickness direction of the battery cell 3 .

[0112] The pressure required to open the explosion-proof valve 31 is lower when it is placed horizontally than when it is placed vertically. This is because the farther the edge of the explosion-proof valve 31 is from the edge of the cover plate 33, the less tension it experiences, making it easier to open. When the explosion-proof valve 31 is placed vertically, the longer sides of the valve 31 and the cover plate 33 are too close together, requiring a greater pressure to open the valve. Therefore, when the explosion-proof valve 31 is placed horizontally, the width b of the slit 11 should be wider, preferably within a preferred range. When the explosion-proof valve 31 is placed vertically, the width b of the slit 11 should be narrower.

[0113] In some embodiments, combined Figure 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 portions 311 of the explosion-proof valves 31 of two adjacent battery cells 3 are arranged 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 expansion of the gap 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, thereby increasing 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 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 45mm or 48mm or 50mm, or it can be an interval range formed by any two of the above values.

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

[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 portion 11 in the area between the two explosion-proof valves 31 is heated more concentratedly, the heat accumulates faster, the speed of expansion of the gap of the slit portion 11 will be accelerated, and the thickness of the wiring harness plate 1 can be thicker.

[0119] In other embodiments, combined Figure 20 、 Figure 21 As shown, a plurality of battery cells 3 are stacked to form a battery column 2. Based on the current placement of the battery cells 3, the remaining portions 311 of the explosion-proof valves 31 of two adjacent battery cells 3 are arranged 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 the remaining portion of each individual battery cell 3 is positioned identically on the first surface. However, depending on the series and parallel connection requirements of the battery array, the battery cells 3 are positioned in different orientations, that is, the poles of the battery cells 3 face different directions. In this embodiment, based on the current placement of the battery cells 3, the remaining portions 311 of the explosion-proof valves 31 of two adjacent battery cells 3 are positioned identically on the first surface.

[0122] Since the residual portions 311 of the explosion-proof valves 31 of two adjacent battery cells 3 are located at the same position on the first surface, when the explosion-proof valves 31 of the two adjacent battery cells 3 explode simultaneously, the residual portions 311 remain connected, and the explosion-proof disc guides the direction of the high-heat medium spray. 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 do not spray against each other, heat is not concentrated, and the slit portion 11 is not easily heated and expanded. In order to avoid affecting the high-heat medium spray, the width of the slit portion 11 can be set larger to ensure that the high-heat medium is sprayed out in a timely manner. 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 high-heat media, and the explosion-proof disc is less likely to fly out. Therefore, the size of the residual portion 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 range formed by any two of the above values.

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

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

[0126] In other embodiments, combined Figure 18As shown, multiple 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 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 remains connected, the explosion-proof plate will guide the spray 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, while the battery cell 3 adjacent to the other side is in a state of back-to-back spraying. When the two battery cells 3 are facing each other, heat is concentrated, accelerating the expansion of the slit 11. In this case, the width of the slit 11 can be set smaller to prevent heat accumulation in a short period of time during valve opening, which could cause the wiring harness plate 1 to burn and widen, thus preventing the high-heat medium from being ejected. When the two battery cells 3 are facing each other, heat is not concentrated, and the slit 11 is not easily heated and expanded. To avoid affecting the high-heat medium ejection, the width of the slit 11 can be set larger. Taking both aspects into consideration, the width b of the slit 11 can be reasonably selected by taking an intermediate 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 wiring harness plate 1 in the direction perpendicular to the plane of the wiring harness plate 1 is f, which satisfies: 185 microns ≤ f ≤ 335 microns. Since the thickness f of the wiring harness plate 1 needs to take into account both states, the value of f should also be moderate.

[0131] In some embodiments, combined Figure 5-Figure 8 As shown, the battery assembly includes a cover plate 33, and the explosion-proof valve 31 is provided 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 recessed surface on one side facing the wiring harness plate 1 or on the side facing away from the wiring harness plate 1 to form an explosion-proof valve mounting groove. By placing the explosion-proof valve 31 in the explosion-proof valve mounting 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 area of ​​the cover plate 33 corresponding to the explosion-proof valve 31 is formed with an explosion-proof valve mounting hole. This allows the explosion-proof valve 31 to open along the path of the thinned portion 312, leaving the hole free for the explosion. In a direction perpendicular to the plane of the cover plate 33, the path of the thinned portion 312 lies within the explosion-proof valve mounting hole. The explosion-proof valve mounting groove is provided around the circumferential edge of the explosion-proof valve mounting hole.

[0135] 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. 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 arranged 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 to form a gap 6 between the harness plate 1 and the explosion-proof valve 31 .

[0137] That is, the cover plate 33 is recessed on the surface of the side facing away from the wiring 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 part 32 are respectively located on both sides of the cover plate 33, so that more gaps are reserved between the wiring harness plate 1 and the explosion-proof valve 31, thereby preventing the wiring 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 provided 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 portions 32 are provided 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] By setting the support portion 32 in a strip shape, it plays 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 the 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 surrounding the explosion-proof valve 31 with the support portion 32, not only can the wiring harness plate 1 be prevented from directly attaching to the explosion-proof disc and affecting its explosion, thus ensuring the smooth opening of the explosion-proof valve 31, but the support portion 32 can also surround the circumferential edge of the explosion-proof valve mounting hole, thereby strengthening the structure of the explosion-proof valve mounting hole. This prevents the explosion-proof valve 31 from being twisted and deformed due to the high heat of welding when it is welded to the cover plate 33, ensuring that the opening pressure of the explosion-proof valve 31 is accurately controlled. In addition, by forming a cavity between the support portion 32, the wiring harness plate 1 and the explosion-proof valve 31, it is possible to facilitate the airtightness testing of the explosion-proof valve 31, while leaving air storage space for the explosion-proof valve 31 after it erupts.

[0143] Furthermore, in this embodiment, the support portion 32 is runway-shaped, adapting to the structure of the explosion-proof valve mounting hole. The runway-shaped support portion 32 provides a large support area, with no sharp corners around the perimeter. With the slit located in the middle of the runway, 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 no longer 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 molding are facilitated, the support effect is improved, and the support portion 32 is prevented from being misaligned due to external forces during the support process. Furthermore, the integral formation of the support portion 32 and the cover plate 33 also improves the strength of the cover plate 33 in the explosion-proof valve area, making it less prone to deformation and ensuring that the opening pressure of the explosion-proof valve 31 is precisely controlled.

[0150] In some embodiments, combined 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 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 as to form a gap 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 side of the wiring harness plate 1, the larger the exhaust space in 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 side of the wiring harness plate 1 cannot 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. The collection branch 12 also needs to bend downward, and after being grouped, it will also occupy too much Z-direction space. On the contrary, if the support portion 32 is too short, the exhaust space in 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, combined 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 , satisfying: 0.008≤j / b≤3.

[0155] In the 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 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 more solid 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, thereby making the slit portion 11 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 cannot be too wide to avoid taking up too much space for the installation of other structural components. At the same time, the slit portion 11 cannot 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 . The protective patch 5 is suitable for preventing impurities from falling onto the explosion-proof valve 31 . The projection of the slit portion 11 toward the first surface overlaps with the protective patch 5 .

[0157] By arranging a 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 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, combined Figure 8 As shown, the wiring harness plate 1 includes a wiring harness plate body 10 , the thickness of the wiring harness plate 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, the thickness of the protective patch 5 is prevented from being too large and the thickness of the wiring harness plate body 10 is too thin, and the protective patch 5 is prevented from supporting the wiring harness plate body 10, 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, the thickness of the protective patch 5 can be prevented from being too small and the thickness of the wiring harness plate body 10 is too large, and the protective patch 5 can be prevented from being too small and easily damaged and ineffective, thus failing to achieve the dust-proof 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, combined 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 while the width of the slit 11 is too large. This prevents the protective patch 5 from being easily broken and ineffective, thus failing to achieve the dustproof effect. 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 while the width of the slit 11 is too small. This prevents the protective patch 5 from being too thick and occupying the gap 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-heat medium.

[0163] In some embodiments, the protective 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 11 , or it 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 protective patch 5 onto the first surface, thereby protecting the entire thinned portion 312 of the explosion-proof valve from contamination. This prevents dust and other impurities from passing through the slit 11 and falling onto the thinned portion 312 of the explosion-proof valve 31. This prevents corrosion or damage to the thinned portion 312, thereby improving safety.

[0168] In some embodiments, combined Figure 6 、 Figure 7 As shown, the cover plate 33 is further provided with a support portion 32 on the outer periphery surrounding the explosion-proof valve 31. The support portion 32 is provided with an air guide groove 321. The direction from the surface of the support portion 32 close to the explosion-proof valve 31 to the surface of the support portion 32 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 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 to 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, making helium testing easier.

[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 larger, the high-heat medium can quickly melt the protective patch, and 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, combined 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, which satisfies: 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 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 the following relationship: 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. In this case, 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 the following relationship: 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 adhesive layer and the projection of the gas guide groove 321 do not overlap, thereby preventing the adhesive layer from blocking the gas guide groove 321 and affecting the helium detection, and preventing 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 passes through 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 the following relationship: 0.016≤q / b≤10.

[0190] The protective patch 5 is provided with a notch 51 that extends through the thickness of the protective patch 5. Under normal conditions, the notch 51 is closed, meaning that the gas storage chamber formed by the protective patch 5, the explosion-proof valve 31, and the support portion 32 is a sealed chamber. However, when testing the battery for airtightness, the notch 51 can be opened under a preset pressure, rendering the gas storage chamber non-sealed. The notch 51 effectively protects the explosion-proof valve 31 during normal use, while also allowing for battery airtightness testing, thereby improving battery performance.

[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 staggered, the total length of the notch 51 refers to the sum of the lengths of the multiple notches.

[0192] The larger the ratio of the total length of the notch 51 to the width of the slit 11, the longer the total length of the notch 51, the easier it is for the high-heat medium to break through the protective patch 5, which facilitates the diffusion of the high-heat medium. In this case, the width of the slit 11 can be set to be smaller. Conversely, the smaller the ratio of the total length of the notch 51 to the width of the slit 11, the shorter the total length of the notch 51, the harder it is for the high-heat medium to break through the protective patch 5, which is not conducive to the diffusion of the high-heat medium. In this case, the width of the slit 11 can be set to be larger. However, the total length of the notch 51 should not be too long to avoid weakening the strength of the protective patch 5 and preventing 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, which satisfies: 10≤q / k≤100, and 0.1 mm≤k≤0.3 mm.

[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, 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 its natural state, and foreign matter such as electrolyte, water, metal chips, dust, etc. may easily enter the interior of the protective patch 5, causing battery safety risks.

[0197] At the same time, if the ratio of the total length of the notch 51 to the thickness of the protective patch 5 is too small, the notch 51 will be difficult to open under a specific pressure; if the ratio of the total length of the notch 51 to the thickness of the protective patch 5 is too large, the length of the notch 51 will be longer, or the thickness of the protective patch 5 will be smaller, making it impossible for the protective patches 5 on both sides of the notch 51 to support each other, the 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, the area of ​​the area enclosed by the circumferential edge of the protective patch 5 in the direction perpendicular to the plane where the protective patch 5 is located is s; the area of ​​the area enclosed by the circumferential edge of the cover plate 33 in the direction perpendicular to the plane where the cover plate 33 is located 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 protective patch 5 can be avoided; by limiting the lower limit of s / t, it can be ensured that the protective patch 5 has sufficient coverage area for the explosion-proof valve 31, so that the protective 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 is in the 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, combined Figure 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 minimum distance u between the injection hole 331 and the protective patch 5 to a lower limit, the electrolyte can be injected through the injection hole 331 while preventing the electrolyte from flowing to the location 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 minimum distance u between the injection hole 331 and the protective patch 5 to an upper limit, the size of the cover plate 33 is prevented from being too large, thus preventing material waste.

[0205] In some embodiments, combined Figure 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, and 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, which satisfies: 1.1mm 2 ≤v≤12.5mm 2 .

[0206] The protective patch 5 is scored 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 score segment forming each cantilever portion 52 and the line connecting the two points of the score segment. For example, a cantilever portion 52 may include two intersecting score segments, so that the two intersecting score 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, forming a semicircular cantilever portion. In this case, the area of ​​the cantilever portion 52 is the area of ​​the semicircle. For example, Figure 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. Figure 10 In the structure shown, the notch 51 is a cross line, and four cantilever portions 52 are formed around the cross line. 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 the notch 51 can be opened smoothly during the airtightness test, that is, the cantilever portion 52 formed by the notch 51 can be opened under a preset pressure, which is used to perform airtightness testing 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, combined Figure 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-temperature medium can be discharged smoothly and the gas conduction is faster.

[0210] In some other embodiments, the projection of the slit 11 toward the protective patch 5 does not overlap with the notch 51 , and the minimum distance between the projection of the slit 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 chips, 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 wiring 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 plate 1, ensuring the supporting effect of the wiring harness plate 1, and it is soft support to avoid damage to the wiring harness plate 1.

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

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

[0220] The root where the cutting seam 13 is connected to 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, resulting in insufficient strength of the main body of the wiring harness plate 10, and the cutting seam 13 and the slit portion 11 are 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 an oversize of the overall size of the wiring harness plate 1 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 ejected from the cutting slit 13 . At this time, the width of the slit portion 11 can be appropriately reduced.

[0225] In some embodiments, combined 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, and there is less space left for wiring on 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 medium.

[0227] In some embodiments, combined Figure 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: 1 mm ≤ A ≤ 10 mm.

[0228] When the minimum distance A between the fuse 14 and the slit 11 is below the lower limit, the fuse 14 is too close to the slit 11, that is, the fuse 14 is too close to the explosion-proof valve 31. After the explosion-proof valve 31 opens, the high-temperature medium may damage the fuse 14, and the fuse 14 will not be able to protect the wiring of the wiring harness board 1. When the minimum distance A between the fuse 14 and the slit 11 is above the upper limit, the fuse 14 is too close to the slit 11, that is, the fuse 14 is too far from the explosion-proof valve 31, resulting in an increased product size and difficulty in product implementation.

[0229] A plurality of core conductive wires 16 are provided inside the wiring harness board 1. The core conductive wires 16 may be copper wires. The fuse 14 is formed by a portion of the core conductive wires 16 with a reduced 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 breaking current, wherein the minimum breaking 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 S-type.

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

[0237] Since fuse 14 must meet a fixed minimum breaking current and has a fixed wire diameter, the length of fuse 14 affects the breaking time. If the ratio of length D of fuse 14 to the width of slit 11 is too small, the slit 11 is too wide and the fuse is too short, resulting in a short breaking time and failing to meet the breaking time requirement. If the ratio is too large, the slit 11 is too narrow and the fuse is too long, resulting in a long breaking time and failing to meet the breaking time requirement.

[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 length of the fuse is shorter after the fuse with a fixed wire diameter is formed by stretching the thinner 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 wiring is fixed, the thinner the single core conductive wire 16 is, and the corresponding length of the formed fuse is shorter and the melting time is faster.

[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 and the wider the width of the slit 11, that is, the thinner the single core conductive wire 16, and the faster the fuse's melting time. When the melting time requirement is met, the faster the fuse's melting 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 and the smaller the width of the slit 11, that is, the thicker the single core conductive wire 16, and the slower the fuse's melting time. If this ratio exceeds a certain limit, a safety hazard may easily occur.

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

[0243] Since fuse 14 must meet a fixed minimum breaking current and have a fixed wire diameter, the length of fuse 14 affects the breaking time. If fuse 14 is too long, the core conductive wire 16 of the main circuit will be thicker, which is not conducive to saving materials, costs, or space. However, fuse 14 cannot be too short, otherwise the breaking time requirement will not be met.

[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 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 equation (E·F / z) / b, the numerator physically represents the width of the core conductive wire 16 as a percentage of the wiring harness plate 1, while the denominator represents the width of the slit 11. Since the width of the slit 11 is affected by the spacing between the positive and negative battery terminals and is within a fixed range, a ratio that is too large indicates that the width of the core conductive wire 16 as a percentage of the wiring harness plate 1 is too large, while 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 generally does not melt after the explosion-proof valve opens. Therefore, a large area of ​​the core conductive wire 16 will cover the explosion-proof valve area, affecting its rapid opening. A ratio that is too small indicates that the width of the core conductive wire 16 as a percentage of the wiring harness plate 1 is too small, while the width of the slit 11 is too large, which can easily cause the entire explosion-proof disk to fly out.

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

[0248] The thicker the protective film 15, the less susceptible it is to heat shrinkage, and the slower the slit 11 widens. Therefore, the initial width of the slit 11 should be larger. Conversely, the thinner the protective film 15, the more susceptible it is to heat shrinkage, and the faster the slit 11 widens. Therefore, the initial width of the slit 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 can 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 adjacent wiring harness plates 1 .

[0251] In some other embodiments, the slit portion 11 is formed by hollowing out at least a portion of the 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 , with a spacer 17 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 provided corresponding to the spacing portion 17 .

[0256] The gap between two adjacent battery cells 3 is arranged corresponding to the spacer, 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, which satisfies: 0.08 mm ≤ H ≤ 0.335 mm;

[0258] The temperature resistance performance parameters of the wiring harness board 1 meet the following requirements: -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, every 250h, 500h, and 1000h, inspect the appearance of the glue on the sample, 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 performed after the FPC temperature reaches the same level as room temperature). Each resistance test must be completed within 24±2h.

[0260] ② High temperature test: Place at 85℃ for 1000 hours. During the test, every 250h, 500h, and 1000h, inspect the appearance of the glue on the sample, 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 reaches the same level as room temperature). Each resistance test must be completed within 24±2h.

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

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

[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 each FPC collection line 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] ② The insulation resistance and withstand voltage leakage current between the 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 1000V DC, 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 1000V DC, test the withstand voltage and 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 at the same collection point should be combined into one wire).

[0267] ② The insulation resistance and withstand voltage leakage current testing method between the FPC and the insulation layer is as follows: 1. Adjust the voltage of the insulation withstand voltage tester to 1000V DC. Test the insulation resistance between any FPC acquisition line and the outer surface of the FPC insulation layer. Read and record the measured resistance value. 2. Adjust the voltage of the insulation withstand voltage tester to 2800V DC. Test the withstand voltage leakage current between any FPC acquisition line and the outer surface of the FPC insulation layer. Read and record the measured leakage current value. (Note: The positive and negative circuits of the same NTC should be combined into a single conductor, and multiple conductors from the same acquisition point should be combined into a single conductor).

[0268] In some embodiments, the battery cell 3 includes a shell 35 , which is a steel shell, and a dimension 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 portion 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 cover plate. When 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 , which 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 spaced apart; when the explosion-proof valve 31 is opened, it is not desired that the high-temperature medium be sprayed onto the pole to avoid further triggering a short circuit and heat spread. Therefore, the space left for the explosion-proof valve 31 and the wiring harness plate 1 above the explosion-proof valve 31 is limited, and the explosion-proof valve 31 and the wiring harness plate 1 will not be too wide. In order to achieve the weight loss ratio in a short time, the area of ​​the explosion-proof valve 31 cannot be too small. Therefore, by limiting the lower limit of c / L, the insufficient valve opening area caused by the area of ​​the explosion-proof valve 31 being too small is avoided. 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, and the high-temperature medium is prevented from being sprayed onto the pole.

[0275] The upper limit of b / c is further limited to avoid the width of the slit portion 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 portion 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] Because the terminal 34 and the explosion-proof valve 31 are located on different sides of the battery cell 3, when the explosion-proof valve 31 is opened, there is no spatial restriction from the terminal, preventing the high-heat medium from erupting onto the terminal. Therefore, the c / L range can be appropriately adjusted. Furthermore, the b / c ratio is limited to an upper limit to prevent the slit 11 from being too wide, thus preventing insufficient wiring space when the wiring harness plate 1 is narrow. By also limiting the b / c ratio to a lower limit, the slit 11 is prevented from being too narrow, hindering pressure relief.

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

[0279] When the explosion-proof valve 31 is provided 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.

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

[0281] When the explosion-proof valve 31 is set on the side of the battery cell 3, since the safety risk on the side is lower, it is not easy for heat to accumulate excessively and break through the box cover or even reach the passenger compartment. Therefore, high-temperature 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 ensuring that the projection of the slit 11 on the cover 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 damage to the liquid injection hole 331 .

[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 liquid injection hole 331, it is possible to prevent foreign matter from eroding the liquid injection hole 331. 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 liquid injection hole 331, it is possible to reasonably control the overall dimensional parameters of the battery, thereby avoiding unreasonable layout and waste of materials.

[0286] In this embodiment, the minimum distance I between the projection of the slit portion 11 on the cover plate 33 and the liquid 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 range 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 the following: 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 provided a battery pack, comprising: the battery assembly as described above;

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

[0292] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Although the embodiments of the present invention have been described with reference to 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 are all within the scope defined by the present invention.

Claims

1. A battery assembly, characterized in that: include: A battery cell (3) has a shell (35), wherein the shell (35) is provided with an explosion-proof valve (31); a side of the shell (35) provided with the explosion-proof valve (31) is defined as a first surface, wherein the explosion-proof valve (31) includes 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 the non-closed area of ​​the thinning portion (312), wherein the thinning portion (312) and the residual portion (311) 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 (311) is greater than the thickness of the thinning portion (312); A wiring harness plate (1), comprising an information acquisition component adapted to acquire the battery temperature and / or voltage of at least one battery cell (3); 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), the slit portion (11) being arranged through the upper and lower surfaces of the wiring harness plate (1) to form a gap; 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 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 the residual portion (311). The straight-line distance between the first end and the second end is defined as the size 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 size of the explosion-proof valve (31) is defined as c, satisfying: c>b, and 0.01≤b / a≤12; The housing (35) 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); 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) extends toward the wiring harness plate (1) and is suitable for supporting the wiring harness plate (1); A protective patch (5) is provided between the slit portion (11) and the explosion-proof valve (31), the protective patch (5) being adapted to prevent 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); The battery cell (3) comprises a cover plate (33), the cover plate (33) is provided with a liquid injection hole (331), the projection of the slit portion (11) on the plane where the cover plate (33) is located does not overlap with 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 the following: 5mm≤I≤188mm.

2. The battery assembly according to claim 1, wherein: 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, and the thickness of the protective patch (5) is defined as k, satisfying the following: 0.29≤k / m≤2.

14.

3. The battery assembly according to claim 1, wherein: The thickness of the protective patch (5) is defined as k, which satisfies the following condition: 0.0016≤k / b≤0.

6.

4. The battery assembly according to claim 1, wherein: The protective patch (5) is fixed to a side of the support portion (32) facing the wiring harness plate (1).

5. The battery assembly according to claim 1, wherein: The projection of the protection patch (5) toward the first surface covers the thinned portion (312).

6. The battery assembly according to claim 1, wherein: 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 support portion (32) away from the explosion-proof valve (31) is defined as the 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: 0.0016≤n / b≤2.

7. The battery assembly according to claim 6, 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.

8. The battery assembly according to claim 6, wherein: The projection of the slit portion (11) toward the first surface overlaps with the air guide groove (321), satisfying the following relationship: 0.01≤n / b≤2.

9. The battery assembly according to claim 6, 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 the following relationship: 0.0016≤n / b≤1.

9.

10. The battery assembly according to claim 6, wherein: 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) toward the side away from the wiring harness plate (1).

11. The battery assembly according to claim 6, wherein: The protective patch (5) is adhesively connected to the support portion (32).

12. The battery assembly according to claim 11, wherein: 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 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.

13. The battery assembly according to claim 12, wherein: In a direction parallel to the plane where the protective patch (5) is located and perpendicular to the thickness of the support portion (32), the width of the notch is p, satisfying the following: 2≤n / p≤5.

14. The battery assembly according to claim 1, wherein: 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, and satisfies the following: 0.016≤q / b≤10.

15. The battery assembly according to claim 14, wherein: The thickness of the protective patch (5) is k, which satisfies: 10≤q / k≤100, and 0.1mm≤k≤0.3mm.

16. The battery assembly according to claim 14, wherein: 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.

17. The battery assembly according to claim 14, wherein: 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, which satisfies the following conditions: 5mm≤u≤54mm.

18. The battery assembly according to claim 14, wherein: At least part of the notch (51) is not on 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 .

19. The battery assembly according to claim 14, wherein: The projection of the slit portion (11) toward the plane where the protective patch (5) is located at least partially overlaps with the notch (51).

20. The battery assembly according to claim 14, wherein: 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≤30mm.

21. The battery assembly according to claim 1, wherein The battery assembly further includes: an insulating top plate (4) disposed between the cover plate (33) and the wiring harness plate (1); In a direction perpendicular to the plane of the wiring harness plate (1), 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.

22. The battery assembly according to claim 1, wherein: The battery cell (3) includes a shell (35), the shell (35) is provided with an opening, and the battery cell (3) also includes a cover plate (33) covering the opening, the cover plate (33) and the shell (35) together enclose 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.

23. A battery pack, characterized in that: include: The battery assembly according to any one of claims 1 to 22; A base plate, the battery cell (3) is placed on the base plate, and the wiring harness plate (1) is arranged on a side of the battery cell (3) facing away from the base plate.

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