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 application relates to the technical field of batteries, in particular to a battery assembly and a battery pack. BACKGROUND

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

[0003] In related technologies, after a plurality of battery monomers are stacked to form a battery pack, a flexible printed circuit (FPC) is arranged on the side of the battery monomers from which the pole column is led out. The FPC can sample and monitor the voltage and temperature information of the battery. By covering the FPC on the explosion-proof valve, the entire explosion-proof piece can be prevented from flying out, but the FPC will also block the discharge of the thermal runaway gas, which is not conducive to the diffusion of high-temperature medium. SUMMARY

[0004] Therefore, the present application provides a battery assembly and a battery pack to solve the problem that the FPC cannot prevent the explosion-proof piece from flying out while meeting the diffusion requirement of high-temperature medium.

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

[0006] The battery monomer has a shell, and the shell is provided with an explosion-proof valve; one side of the shell provided with the explosion-proof valve is defined as a first surface, the explosion-proof valve includes a non-closed thinning portion, the thinning portion is adapted to make the gas inside the battery monomer realize pressure relief by breaking through the thinning portion; and a residual portion located in the non-closed area of the thinning portion, the thinning portion and the residual portion jointly enclose a continuous closed loop pattern; in the direction perpendicular to the first surface, the thickness of the residual portion is greater than the thickness of the thinning portion;

[0007] The wire harness plate includes an information acquisition assembly adapted to acquire the battery temperature and / or voltage of the battery monomer; is located on the side of the battery monomer provided with the explosion-proof valve; the wire harness plate is formed with a slotted portion, the slotted portion is provided through the upper and lower surfaces of the wire harness plate to form a gap; the projection of the slotted portion towards the first surface at least partially overlaps the explosion-proof valve;

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

[0009] Beneficial effects: by restricting the size of the width b of the slotted portion, when the width of the slotted portion is too large, the wire harness plate will shrink after being burned by high-temperature medium, which will further increase the width of the slotted portion, and it is easy to cause the explosion-proof piece to fly out; while when the width of the slotted portion is too small, although the flying out of the explosion-proof piece can be inhibited, it is not conducive to the diffusion of high-temperature medium and the rapid explosion 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 the battery cell and the harness plate of the present application with an insulating top plate provided therebetween;

[0023] Figure 9 A schematic view of the cover plate of the present application;

[0024] Figure 10 A schematic view of the protective patch of the present application Figure 1 ;

[0025] Figure 11 A schematic view of the protective patch of the present application Figure 2 ;

[0026] Figure 12 A schematic view of the interior of the harness plate of the present application;

[0027] Figure 13 A schematic view of the positional relationship between the battery cell and the slotted portion of the present application Figure 1 ;

[0028] Figure 14 A schematic view of the positional relationship between the battery cell and the slotted portion of the present application Figure 2 ;

[0029] Figure 15 A schematic view of the positional relationship between the battery cell and the slotted portion of the present application Figure 3 ;

[0030] Figure 16 A schematic view of the positional relationship between the battery cell and the slotted portion of the present application Figure 4 ;

[0031] Figure 17 A schematic view of the positional relationship between the battery cell and the slotted portion of the present application Figure 5 ;

[0032] Figure 18 A schematic view of the length direction of the residual portion of the adjacent battery cells and the length direction of the first surface Figure 1 ;

[0033] Figure 19 A schematic view of the length direction of the residual portion of the adjacent battery cells and the width direction of the first surface Figure 1 ;

[0034] Figure 20 A schematic view of the length direction of the residual portion of the adjacent battery cells and the length direction of the first surface Figure 2 ;

[0035] Figure 21 A schematic view of the length direction of the residual portion of the adjacent battery cells and the width direction of the first surfaceFigure 2 .

[0036] BRIEF DESCRIPTION OF DRAWINGS

[0037] 1, harness plate; 10, harness plate body; 11, slotted part; 12, acquisition branch; 13, cutting slot; 14, fuse; 15, protective film; 16, core conductive wire; 17, spacing part;

[0038] 2, battery column; 3, battery monomer; 31, explosion-proof valve; 311, residual part; 312, thinning part; 32, support part; 321, air guide groove; 33, cover plate; 331, liquid injection hole; 34, pole; 35, shell;

[0039] 4, insulating top plate; 5, protective patch; 51, score; 52, cantilever part; 501, first end point; 502, second end point; 6, gap part. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0041] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0042] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

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

[0044] For the convenience of clearly describing the positional relationship of various structures in the embodiments of the application, the direction and orientation are first defined. One side of the shell 35 provided with the explosion-proof valve 31 is defined as the first surface, the length direction of the slotted portion 11 is defined as the first direction, and the width direction of the slotted portion 11 is defined as the second direction, wherein the first direction and the second direction are perpendicular to each other.

[0045] It should be noted that the length direction of the slotted portion 11 is the first direction, wherein the length direction of the slotted portion 11 refers to the length direction of the gap formed on the wire harness plate; the width direction of the slotted portion 11 is the second direction, wherein the width direction of the slotted portion 11 refers to the width direction of the gap formed on the wire harness plate; wherein the length direction of the gap formed on the wire harness plate is greater than the width direction of the gap formed on the wire harness plate.

[0046] The embodiments of the application will be described below in combination with Figures 1 to 21 .

[0047] According to the embodiments of the application, on the one hand, a battery assembly is provided, comprising:

[0048] The battery monomer 3 has a shell 35 provided with an explosion-proof valve 31; one side of the shell 35 provided with the explosion-proof valve 31 is defined as the first surface, the explosion-proof valve 31 comprises a non-closed thinning portion 312, the thinning portion 312 is adapted to make the gas inside the battery monomer 3 realize pressure relief by breaking through the thinning portion 312; and a residual portion 311 located in the non-closed area of the thinning portion 312, the thinning portion 312 and the residual portion 311 jointly enclose a continuous closed loop pattern; in the direction perpendicular to the first surface, the thickness of the residual portion 311 is greater than the thickness of the thinning portion 312;

[0049] The wire harness plate 1 comprises an information acquisition assembly adapted to acquire the battery temperature and / or voltage of at least one battery monomer 3; is located on the side of the battery monomer 3 provided with the explosion-proof valve 31; the wire harness plate 1 is formed with a slotted portion 11, the slotted portion 11 is provided through the upper and lower surfaces of the wire harness plate 1 to form a gap; the projection of the slotted portion 11 towards the first surface at least partially overlaps the explosion-proof valve 31;

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

[0051] By setting the thinning portion 312, when the battery cell 3 is in thermal runaway, the explosion-proof valve 31 is opened along the path of the thinning portion 312, and the exhaust is achieved. Further, the residual portion 311 is provided, and the thickness of the residual portion 311 is greater than the thickness of the thinning portion 312 in the direction perpendicular to the plane where the explosion-proof valve 31 is located, so that when the explosion-proof valve 31 is opened along the path of the thinning portion 312, the residual portion 311 can still be connected to other areas of the shell or cover plate, preventing the explosion-proof sheet from flying out entirely.

[0052] The wire harness plate 1 is arranged on the side of the battery cell 3 where the explosion-proof valve 31 is arranged, so that the wire harness plate 1 can press on the explosion-proof valve 31, also preventing the explosion-proof sheet from flying out entirely.

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

[0054] By restricting the size of the width b of the slotted portion 11, when the width of the slotted portion 11 is too large, the wire harness plate 1 will shrink after being burned by high-temperature medium, causing the width of the slotted portion 11 to further increase, which can easily cause the explosion-proof sheet to fly out; when the width of the slotted portion 11 is too small, although it can prevent the explosion-proof sheet from flying out, it is not conducive to the diffusion of high-temperature medium and the rapid opening of the explosion-proof valve.

[0055] By restricting the size a of the residual portion 311 in the width direction of the slotted portion 11, when the size of the residual portion 311 is too small, the residual portion 311 is less connected to other areas of the shell or cover plate, and the explosion-proof sheet is prone to break the residual portion 311 after being stressed, causing the explosion-proof sheet to fly out; when the size of the residual portion 311 is too large, it will cause the size of the thinning portion 312 to decrease accordingly, resulting in a too small valve opening area of the explosion-proof valve 31, which is not conducive to the rapid diffusion of high-temperature medium.

[0056] The explosion-proof valve 31 includes a non-closed thinning portion 312 and a residual portion 311 located in the non-closed area of the thinning portion 312, and the thinning portion 312 and the residual portion 311 jointly form a continuous closed loop pattern. The continuous closed loop pattern can be, for example, a racetrack shape, an oval shape, a rectangular shape, etc.

[0057] As an implementation form, the explosion-proof valve 31 comprises a plurality of discontinuous thinning portions 312, and a residual portion 311 is arranged between adjacent thinning portions 312; the plurality of thinning portions 312 and the plurality of residual portions 311 jointly enclose a continuous closed loop pattern. Taking the continuous closed loop pattern as a runway shape, the forming path of the plurality of thinning portions 312 coincides with the runway shape.

[0058] As another implementation form, the explosion-proof valve 31 comprises a continuous thinning portion 312, two ends of the thinning portion 312 form a first end portion and a second end portion, and a region between the first end portion and the second end portion of the thinning portion 312 forms a residual portion 311; the thinning portion 312 and the residual portion 311 jointly enclose a continuous closed loop pattern. Taking the continuous closed loop pattern as a runway shape, the forming path of the thinning portion 312 coincides with the runway shape, but the forming path of the residual portion 311 is a straight line.

[0059] Since the thinning portion 312 is partially thinned by the first surface of the shell 35, in order to ensure that the thinning portion 312 and the residual portion 311 jointly enclose a continuous closed loop pattern, so that they are better combined to form a continuous closed loop pattern.

[0060] It should be noted that the size a of the residual portion 311 refers to the distance between the first end portion and the second end portion. In combination with Figure 13 As shown, the residual portion 311 is a straight line, and the length of the residual portion 311 along the second direction is the size a of the residual portion 311.

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

[0062] The wire harness plate 1 can extend along the first direction or along the second direction, wherein the first direction and the second direction can be the directions shown in the drawings, and in the embodiment, the length direction of the slotted portion 11 is parallel to the length direction of the wire harness plate 1.

[0063] As a variation, the length direction of the slotted portion 11 can also be perpendicular to the length direction of the wire harness plate 1. That is, for example, when the length direction of the wire harness plate 1 is parallel to the first direction, the length direction of the slotted portion 11 is parallel to the second direction. When the battery assembly contains a plurality of battery monomers 3, a plurality of slotted portions 11 can be arranged, so that each slotted portion 11 corresponds to the explosion-proof valve of one battery monomer 3. And the plurality of slotted portions 11 are parallel to the second direction, and the plurality of slotted portions 11 are parallel and spaced.

[0064] In the embodiment, the length of the thinning portion 312 is in the range of 20 mm-120 mm, for example, the length of the thinning portion 312 can be 20 mm or 40 mm or 50 mm or 60 mm or 75 mm or 85 mm or 100 mm or 120 mm, or can be an interval range 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 forming path of the thinning portion 312.

[0065] In the embodiment, the size a of the residual portion 311 is in the range of 5 mm-50 mm, for example, can be 5 mm or 15 mm or 20 mm or 30 mm or 35 mm or 45 mm or 50 mm, or can be an interval range formed by any two of the above values.

[0066] In the embodiment, the width b of the slotted portion 11 is in the range of 0.5 mm-60 mm, for example, 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 can be an interval range formed by any two of the above values.

[0067] In the embodiment, the value of b / a is in the range of 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 can be an interval range formed by any two of the above values.

[0068] In order to verify the opening performance of the explosion-proof valve 31, the following verifies the opening performance through several groups of examples and comparative examples. In the embodiments of the present application, the opening performance of the explosion-proof valve 31 needs to meet the following conditions to pass the test: ① the opening time △t (unit: s) needs to be within 60 s; ② the probability of opening at the preset opening pressure (unit: %) needs to be above 55%; ③ the probability of the entire explosion-proof disc flying out (unit: %) needs to be within 30%.

[0069] The specific test method of the opening performance of the explosion-proof valve 31 is not limited in the present application, and those skilled in the art can detect the opening performance of the explosion-proof valve 31 according to conventional technical means.

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

[0071] Select 100 battery monomers 3, the selected battery monomers 3 do not need to be provided with battery cores, only have a shell 35 (wherein the shell 35 includes a cover plate 33, and the cover plate 33 includes an explosion-proof valve 31), under a fixed clamping force of 5000N, the shell 35 is filled with gas, the gas pressure in the shell 35 is monitored, the gas is maintained when the gas pressure reaches a specified pressure (for example, the opening valve pressure of the explosion-proof valve 31 can be preset to-0.01MPa), whether the valve is opened under this pressure is observed, and the following data is recorded:

[0072] ①From reaching the specified pressure to the actual explosion-proof valve 31 explosion, that is, the opening valve time Δt;

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

[0074] ③Whether the explosion-proof sheet flies out as a whole is observed, and the probability of the explosion-proof sheet flying out as a whole is counted, wherein the calculation method of the probability of the explosion-proof sheet flying out as a whole is: the number of batteries with the explosion-proof sheet flying out as a whole / 100.

[0075] According to actual tests, the following Table 1 is further illustrated by specific embodiments:

[0076] Table 1

[0077]

[0078] In embodiments 1 to 6, the width b of the slotted portion 11 is within the preferred value range, that is, the preferred range of the width b of the slotted portion 11 satisfies: 10mm≤b≤50mm; the size a of the residual portion 311 is within the preferred value range, that is, the preferred range of the size a of the residual portion 311 satisfies: 5mm≤a≤40mm; and the value of b / a is also within the preferred value range, that is, the preferred range of b / a satisfies: 0.25≤b / a≤10. According to tests, the opening valve performance of the explosion-proof valve 31 can satisfy: ① the opening valve time Δt (unit: s) is within 20s; ② the probability of opening the valve under the preset opening valve pressure (unit: %) is higher than 84%; and ③ the probability of the explosion-proof sheet flying out as a whole (unit: %) is lower than 10%. The opening valve performance of the explosion-proof valve 31 is excellent.

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

[0080] In Embodiments 11-12, compared with Embodiments 1-6, the value of the width b of the slit portion 11 is in the preferred value range, i.e., the preferred range of the width b of the slit portion 11 satisfies: 10mm≤b≤50mm; the value of the size a of the residual portion 311 is in the preferred value range, i.e., the preferred range of the size a of the residual portion 311 satisfies: 5mm≤a≤40mm; and the value of b / a is in the upper and lower limit ranges but not all in the preferred value range. It is tested that the opening performance of the explosion valve 31 can satisfy: ① the opening time △t (unit: s) is within 40 s; ② the probability (unit: %) of opening at the preset opening pressure is higher than 65%; and ③ the probability (unit: %) of the entire explosion disc flying out is lower than 20%. The opening performance of the explosion valve 31 is good.

[0081] In Embodiments 13-14, compared with Embodiments 1-6, the value of the width b of the slit portion 11 and the value of the size a of the residual portion 311 are in the upper and lower limit ranges but not all in the preferred value range, and the value of b / a is in the upper and lower limit ranges but not all in the preferred value range. It is tested that the opening performance of the explosion valve 31 can satisfy: ① the opening time △t (unit: s) is within 50 s; ② the probability (unit: %) of opening at the preset opening pressure is higher than 60%; and ③ the probability (unit: %) of the entire explosion disc flying out is lower than 25%. The opening performance of the explosion valve 31 is acceptable.

[0082] In Embodiments 15-16, compared with Embodiments 1-6, the value of the width b of the slit portion 11 and the value of the size a of the residual portion 311 exceed the upper and lower limit ranges, and the value of b / a is in the upper and lower limit ranges but not all in the preferred value range. It is tested that the opening performance of the explosion valve 31 can satisfy: ① the opening time △t (unit: s) is within 60 s; ② the probability (unit: %) of opening at the preset opening pressure is higher than 55%; and ③ the probability (unit: %) of the entire explosion disc flying out is lower than 30%. Only the minimum conditions of the opening performance of the explosion valve 31 can be met, and the test is qualified.

[0083] In the comparative example 1 and the comparative example 2, the width b of the slit portion 11 and the size a of the residual portion 311 are out of the upper and lower limit ranges, and the value of b / a is out of the upper and lower limit ranges. It is tested that the opening valve performance of the explosion-proof valve 31 can meet: ① the opening valve time △t (unit: s) is more than 60 s; ② the probability (unit: %) of opening valve at the preset opening valve pressure is less than 55%; and ③ the probability (unit: %) of the entire explosion-proof disc flying out is more than 30%. The minimum limit conditions of the opening valve performance of the explosion-proof valve 31 cannot be met, and the test is unqualified.

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

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

[0086] In some embodiments, in combination with Figure 13 As shown in FIG. 1, the projection of the slit portion 11 on the plane where the first surface is located at least partially overlaps the residual portion 311; along the width direction of the slit portion 11, the width b of the slit portion 11 preferably satisfies: 10 mm≤b≤50 mm; and the preferred range of b / a satisfies: 0.25≤b / a≤10.

[0087] When the projection of the slit portion 11 towards the battery monomer 3 at least partially overlaps the residual portion 311, since the area corresponding to the residual portion 311 is not opened, there is no high-temperature medium directly opposite the slit portion 11 to erupt, so the speed of the gap expansion at this position will slow down. In order to ensure the smooth diffusion of the high-temperature medium, it is required that the width of the slit portion 11 should be appropriately larger, and the size of the residual portion 311 should be appropriately smaller, so as to facilitate the rapid eruption of the high-temperature medium.

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

[0089] In other embodiments, in combination with Figure 14 As shown in FIG. 2, the projection of the slit portion 11 towards 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 satisfies: 0.2≤b / a≤2.

[0091] Since the projection of the slitted part 11 towards the battery monomer 3 completely covers the residual part 311, that is, the slitted part 11 completely corresponds to the residual part 311, since the area corresponding to the residual part 311 is not opened, there is no high-temperature medium eruption directly opposite the slitted part 11, and thus the expansion speed of the slit at this position is slower than when the projection of the slitted part 11 towards the battery monomer 3 at least partially overlaps the residual part 311, and thus, in order to ensure the smooth diffusion of the high-temperature medium, it is required that the width of the slitted part 11 be appropriately larger, and the size of the residual part 311 be appropriately smaller.

[0092] In the present embodiment, the width b of the slitted part 11 can be 2mm or 3mm or 4mm or 5mm or 6mm or 8mm or 10mm, or an interval range formed by any two of the above values.

[0093] In other embodiments, in combination with Figure 15 or Figure 16 or Figure 17 As shown, the projection of the slitted part 11 towards the first surface does not coincide with the residual part 311; along the width direction of the slitted part 11, the width b of the slitted part 11 satisfies: 0.5mm≤b≤20mm;

[0094] and satisfies: 0.012≤b / a≤4.

[0095] Since the projection of the slitted part 11 towards the first surface does not coincide with the residual part 311, that is, the slitted part 11 does not correspond to the residual part 311, but corresponds to the thinned part 312 of the explosion-proof valve 31, at this time the high-temperature medium erupts directly opposite the slitted part 11, which is conducive to the rapid diffusion of the high-temperature medium. The expansion speed of the slit at this position is faster, and thus the width of the slitted part 11 can be appropriately reduced. Since the slitted part 11 will further expand after the high-temperature medium erupts, the constraint of the slitted part 11 on the explosion-proof sheet will become smaller, and in order to avoid the explosion-proof sheet being easily pulled off the residual part 311 after being stressed, the size of the residual part 311 can be appropriately increased, which is more conducive to preventing the explosion-proof sheet from flying out.

[0096] In the present embodiment, the width b of the slitted part 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 an interval range formed by any two of the above values.

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

[0098] Since a plurality of core conductive wires 16 are arranged in the wire harness panel 1, in general, the number of branches of the core conductive wires 16 to be equipped for the positive and negative electrode posts is equivalent, and the position of the slotted portion 11 is not wired.

[0099] Along the width direction of the slotted portion 11, by arranging the slotted portion 11 at the middle position of the wire harness panel 1, the width of the wire harness panel 1 on both sides of the slotted portion 11 along the width direction is equivalent, so that the number of branches of the core conductive wires 16 distributed on both sides of the slotted portion 11 along the width direction is more even, which is more convenient for the arrangement of the wire harness.

[0100] Meanwhile, the projection of the slotted portion 11 towards the first surface overlaps with the center position of the explosion-proof valve 31. Thus, the slotted portion 11 is arranged opposite to the explosion-proof valve 31, which ensures smooth exhaust after the explosion-proof valve 31 is opened, and the effect of the explosion is better.

[0101] In combination Figure 2 As shown in the figure, the length direction of the slotted portion 11 is parallel to the length direction of the wire harness panel 1, that is, the wire harness panel 1 also extends along the first direction, at this time, the width direction of the slotted portion 11 is parallel to the second direction.

[0102] In other embodiments, in combination Figure 4 As shown in the figure, the length direction of the slotted portion 11 is parallel to the length direction of the wire harness panel 1, along the width direction of the slotted portion 11, the vertical distance between the side edge of the slotted portion 11 close to the middle line of the wire harness panel 1 and the middle line of the wire harness panel 1 is d, which satisfies: 0.5mm≤d≤20mm.

[0103] When the length direction of the slotted portion 11 is parallel to the length direction of the wire harness panel 1, and along the width direction of the slotted portion 11, there is a distance d between the slotted portion 11 and the middle line of the wire harness panel 1, that is, the width of the wire harness panel 1 on both sides of the slotted portion 11 along the width direction is not equivalent, one side is larger and the other side is smaller.

[0104] When the vertical distance d between the side edge of the slotted portion 11 close to the middle line of the wire harness panel 1 and the middle line of the wire harness panel 1 is larger, since the position of the slotted portion 11 is not wired, the number of branches of the core conductive wires 16 distributed on both sides of the slotted portion 11 along the width direction is not equivalent, among which, the number of branches on the side with larger width of the wire harness panel 1 is more concentrated, while the number of branches on the side with smaller width of the wire harness panel 1 is less, which ensures that the influence of the opening impact of the explosion-proof valve on the wire harness is smaller.

[0105] When the vertical distance d between the side edge of the slotted portion 11 close to the middle line of the wire harness panel 1 and the middle line of the wire harness panel 1 is smaller, the number of branches of the core conductive wires 16 distributed on both sides of the slotted portion 11 along the width direction is more even, which is more convenient for the arrangement of the wire harness. It is convenient to arrange the slotted portion 11 opposite to the explosion-proof valve 31, which ensures smooth exhaust after the explosion-proof valve 31 is opened, and the effect of the explosion is better.

[0106] In the present 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 an interval range formed by any two of the above values.

[0107] In some embodiments, as shown in FIG. 1, 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 slotted portion 11 is perpendicular to the length direction of the residual portion 311, and the following condition is satisfied: 1 mm≤b≤60 mm. Figure 13 Figure 15 In some embodiments, as shown in FIG. 1, the length direction of the explosion-proof valve 31 is parallel to the thickness direction of the battery monomer 3, and the length direction of the slotted portion 11 is parallel to the length direction of the residual portion 311, and the following condition is satisfied: 0.5 mm≤b≤40 mm.

[0108] In the present embodiment, the value of b 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 26 mm or 30 mm or 32 mm or 37 mm or 40 mm, or an interval range formed by any two of the above values.

[0109] In some embodiments, as shown in FIG. 1, the length direction of the explosion-proof valve 31 is parallel to the thickness direction of the battery monomer 3, and the length direction of the slotted portion 11 is parallel to the length direction of the residual portion 311, and the following condition is satisfied: 0.5 mm≤b≤40 mm. Figure 17 In the present embodiment, the value of b 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 26 mm or 30 mm or 32 mm or 37 mm or 40 mm, or an interval range formed by any two of the above values.

[0110] For simplicity of description, the description that the length direction of the explosion-proof valve 31 is parallel to the length direction of the first surface is described as the explosion-proof valve 31 being laid horizontally; and the description that the length direction of the explosion-proof valve 31 is parallel to the thickness direction of the battery monomer 3 is described as the explosion-proof valve 31 being laid vertically.

[0111] The explosion-proof valve 31 laid horizontally has a smaller opening pressure than the explosion-proof valve 31 laid vertically, because the farther the edge of the explosion-proof valve 31 is from the edge of the cover plate 33, the less the explosion-proof valve 31 is pulled by the cover plate 33, and the easier the explosion-proof valve 31 is to open. When the explosion-proof valve 31 is laid vertically, the long edges of the explosion-proof valve 31 and the cover plate 33 are too close, and a larger opening pressure is needed to open the explosion-proof valve 31. Therefore, the width b of the slotted portion 11 should be wider when the explosion-proof valve 31 is laid horizontally, and b should be in a more preferred range, while the width b of the slotted portion 11 needs to be set narrower when the explosion-proof valve 31 is laid vertically.

[0112]

[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, and along the width direction of the slit portion 11, the width b of the slit portion 11 satisfies: 1mm≤b≤60mm.

[0121] It should be noted that for each battery monomer 3 alone, the residual part is arranged at the same position on the first surface. However, according to the different series-parallel requirements of the battery column, the placing direction of the battery monomer 3 is different, that is, the pole of the battery monomer 3 is different. In this embodiment, based on the current placing position of the battery monomer 3, the residual part 311 of the explosion-proof valve 31 of the adjacent two battery monomers 3 is arranged at the same position on the first surface.

[0122] Since the residual part 311 of the explosion-proof valve 31 of the adjacent two battery monomers 3 is arranged at the same position on the first surface, when the explosion-proof valves 31 of the adjacent two battery monomers 3 are opened at the same time, since the residual part 311 still remains connected, the explosion-proof disc can guide the jet direction of the high-temperature medium, the opening direction of the explosion-proof valve 31 of the adjacent two battery monomers 3 is consistent, so that the adjacent two battery monomers 3 will not be sprayed, the heat is not concentrated, and the slit portion 11 is not easy to expand due to heat. In order to avoid affecting the eruption of the high-temperature medium, the width of the slit portion 11 can be set larger at this time to ensure that the high-temperature medium is ejected in time. At the same time, since the opening direction of the explosion-proof valve 31 of the adjacent two battery monomers 3 is consistent, the heat will not be accumulated due to the collision of the high-temperature medium, and the explosion-proof disc is not easy to fly out, so the size of the residual part 311 can be set smaller.

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

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

[0125] Since the opening direction of the explosion-proof valve 31 of the adjacent two battery monomers 3 is consistent, the heat accumulation when the high-temperature medium erupts is between the opposite opening directions and the opposite opening directions, so the thickness of the harness plate 1 needs to be moderate.

[0126] In some other embodiments, in combination with Figure 18As shown, the plurality of battery monomers 3 are stacked to form the battery column 2, the length direction of the residual part 311 is parallel to the length direction of the first surface; along the width direction of the first surface, the residual part 311 of the explosion-proof valve 31 of one of the battery monomers 3 is arranged close to the residual part 311 of the explosion-proof valve 31 of the battery monomer 3 on one side, and is arranged away from the residual part 311 of the explosion-proof valve 31 of the battery monomer 3 on the other side;

[0127] The length direction of the slitted part 11 is parallel to the width direction of the first surface, and along the width direction of the slitted part 11, the width b of the slitted part 11 satisfies: 1mm≤b≤50mm.

[0128] Because along the width direction of the first surface, the residual part 311 of the explosion-proof valve 31 of one of the battery monomers 3 is arranged close to the residual part 311 of the explosion-proof valve 31 of the battery monomer 3 on one side, and is arranged away from the residual part 311 of the explosion-proof valve 31 of the battery monomer 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 of the battery monomers 3 is opposite to the opening direction of the explosion-proof valve 31 of the battery monomer 3 on one side, and is opposite to the opening direction of the explosion-proof valve 31 of the battery monomer 3 on the other side, that is, when the explosion-proof valves 31 of the plurality of battery monomers 3 are opened at the same time, because the residual part 311 still remains connected, the explosion-proof disc guides the jet direction of the high-temperature medium, so that the battery monomer 3 and the battery monomer 3 adjacent to one side are in the state of jetting, and the battery monomer 3 adjacent to the other side is in the state of jetting in the opposite direction. The two battery monomers 3 in the jetting state concentrate heat, and the speed of the slit of the slitted part 11 expands faster, at this time, the width of the slitted part 11 can be set smaller, so as to avoid the ablation of the harness plate 1 due to the accumulation of heat in a short time when the valve is opened, so as to make the width of the slitted part 11 larger, and not to affect the jetting of the high-temperature medium; and the two battery monomers 3 in the jetting state do not concentrate heat, and the slitted part 11 is not easy to expand due to heat, in order to avoid affecting the jetting of the high-temperature medium, at this time, the width of the slitted part 11 can be set larger. The two states are combined, and the width b of the slitted part 11 can be reasonably selected by taking the intermediate value.

[0129] In this embodiment, the width b of the slitted part 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 an interval range formed by any two of the above values.

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

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

[0132] The cover plate 33 further comprises a support portion 32 arranged around the outer circumferential side of the explosion-proof valve 31, the support portion 32 extends towards the wire harness plate 1 and is adapted to support the wire harness plate 1.

[0133] The side surface of the cover plate 33 facing the wire harness plate 1 or the side surface of the cover plate 33 away from the wire harness plate 1 is recessed to form an explosion-proof valve mounting groove, by arranging the explosion-proof valve 31 in the explosion-proof valve mounting groove, the explosion-proof valve 31 can be installed and fixed, and specifically, the explosion-proof valve 31 is fixedly connected with the cover plate 33 by welding.

[0134] The region of the cover plate 33 corresponding to the explosion-proof valve 31 is formed with an explosion-proof valve mounting hole, so that when the explosion-proof valve 31 is blown open along the path of the thinning portion 312, the explosion-proof valve mounting hole can give way to the explosion-proof valve 31. In the direction perpendicular to the plane of the cover plate 33, the path of the thinning portion 312 is within the range of the explosion-proof valve mounting hole. The explosion-proof valve mounting groove is arranged around the circumferential edge of the explosion-proof valve mounting hole.

[0135] The cover plate 33 further comprises a support portion 32 arranged around the outer circumferential side of the explosion-proof valve 31, the support portion 32 extends towards the wire harness plate 1 and is adapted to support the wire harness plate 1, after the support portion 32 supports the wire harness plate 1, a gap is left between the wire harness plate 1 and the explosion-proof valve 31, thereby preventing the wire harness plate 1 from directly adhering to the explosion-proof disc and affecting the explosion of the explosion-proof disc.

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

[0137] That is, the cover plate 33 is recessed on the side surface away from the wire harness plate 1 to form an explosion-proof valve mounting groove, so that the explosion-proof valve 31 is arranged in the explosion-proof valve mounting groove, and the explosion-proof valve 31 and the support portion 32 are located on both sides of the cover plate 33, respectively, so that more gap is left between the wire harness plate 1 and the explosion-proof valve 31, thereby preventing the wire harness plate 1 from directly adhering to the explosion-proof disc and affecting the explosion of the explosion-proof disc.

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

[0139] And / or, the support portion 32 is arranged on both sides of the width direction of the explosion-proof valve 31 and extends along the length direction of the explosion-proof valve 31.

[0140] By setting the support part 32 as a strip, a supporting effect is achieved to form a gap between the wiring harness plate 1 and the explosion-proof valve 31, thereby preventing the wiring harness plate 1 from directly adhering to the explosion-proof disc to affect the explosion thereof and ensuring smooth opening of the explosion-proof valve 31.

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

[0142] By arranging the support part 32 around the explosion-proof valve 31, not only can the wiring harness plate 1 be prevented from directly adhering to the explosion-proof disc to affect the explosion thereof and ensure smooth opening of the explosion-proof valve 31, but also the support part 32 can be arranged around the circumferential edge of the explosion-proof valve mounting hole to play a structure reinforcing role on the explosion-proof valve mounting hole, thereby avoiding the explosion-proof valve 31 from being twisted and deformed due to high heat during welding of the explosion-proof valve 31 to the cover plate 33 and ensuring accurate controllability of the opening pressure of the explosion-proof valve 31. By forming the cavity between the support part 32, the wiring harness plate 1 and the explosion-proof valve 31, the explosion-proof valve 31 can be conveniently subjected to air tightness detection, and a gas storage space is left for the explosion-proof valve 31 after explosion.

[0143] Further, in the embodiment, the support part 32 is in a runway type to adapt to the structure of the explosion-proof valve mounting hole. When the support part 32 is in the runway type, the support area is large, the circumferential edge is free of corners, and when the slotted part is located at the middle position of the runway type, the support part 32 can uniformly support the wiring harness plate 1.

[0144] As a deformation, the support part 32 can also be in an oval or rectangular shape.

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

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

[0147] By separately arranging the support part 32 and the cover plate 33, the support part 32 can be conveniently disassembled and removed when not needed.

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

[0149] By integrally forming the support part 32 and the cover plate 33, the processing and forming are convenient, the supporting effect is better, and the support part 32 is prevented from being dislocated due to external force touch during the supporting process. At the same time, the integrally formed support part 32 and cover plate 33 can also improve the strength of the cover plate 33 in the explosion-proof valve area, which is not easy to deform, thereby ensuring accurate controllability of the opening pressure of the explosion-proof valve 31.

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

[0151] The support portion 32 is supported between the harness plate 1 and the explosion-proof valve 31 to form a gap portion between the 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 towards the harness plate 1 side, the larger the exhaust space of the gap portion, and correspondingly, the smaller the slotted portion 11 can be set. At the same time, the height of the support portion 32 protruding from the surface of the cover plate 33 towards the harness plate 1 side cannot be too high. When the support portion 32 is too high and even exceeds the height of the pole top surface, it is not convenient to connect the branch 12 to the pole, and the branch 12 also needs to be bent downward, and after grouping, it also occupies too much Z-direction space. On the contrary, if the support portion 32 is too low, it will result in a small exhaust space of the gap portion, which is not conducive to the eruption of high-temperature medium, and the gap between the harness plate 1 and the explosion-proof valve 31 is too small, which can affect the explosion of the explosion-proof sheet.

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

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

[0155] In the plane parallel to the plane where the cover plate 33 is located, the wider the distance between the surface of the support portion 32 close to the explosion-proof valve 31 side and the surface away from the explosion-proof valve 31 side, the larger the area of the support portion 32 for supporting the harness plate 1, the more firm the harness plate 1, and the support portion 32 surrounds the circumferential edge of the explosion-proof valve mounting hole, which has a greater structure strengthening effect on the explosion-proof valve mounting hole. The strength of the cover plate near the explosion-proof valve 31 is higher, the opening valve pressure is more stable, the opening valve threshold can be set larger, and the slotted portion 11 can be set smaller. Correspondingly, the width of the harness plate 1 for wiring 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 occupying too much space for other structural components. At the same time, the slotted portion 11 cannot be too small to avoid hindering the eruption of high-temperature medium.

[0156] In some embodiments, a protective patch 5 is arranged between the slotted portion 11 and the explosion-proof valve 31, and the protective patch 5 is adapted to prevent impurities from falling onto the explosion-proof valve 31. The projection of the slotted portion 11 towards the first surface overlaps the protective patch 5.

[0157] By setting the protective patch 5 between the slotted portion 11 and the explosion-proof valve 31, and the projection of the slotted portion 11 towards the first surface overlaps with the protective patch 5, it can avoid impurities such as dust from falling through the slotted portion 11 onto the explosion-proof valve 31, especially to avoid conductive impurities from falling onto the explosion-proof valve 31, to avoid corrosion or damage to the explosion-proof valve 31, and to improve safety performance.

[0158] In some embodiments, in combination with Figure 8 As shown, the wire harness plate 1 includes a wire harness plate body 10, defining the thickness of the wire harness plate body 10 as m, and the thickness of the protective patch 5 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 wire harness plate body 10, it prevents the protective patch 5 from being too thick and the wire harness plate body 10 from being too thin, avoiding the situation that the protective patch 5 will support the wire harness plate body 10 and cause it to be placed unevenly. In addition, if the protective patch 5 is too thick, it will occupy the gap space reserved between the wire harness plate 1 and the explosion-proof valve 31, thereby reducing the exhaust space of the spray and affecting the spray 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 wire harness plate body 10, it prevents the protective patch 5 from being too thin and the wire harness plate body 10 from being too thick, avoiding the situation that the protective patch 5 is too thin and is easily damaged and fails to play a dustproof effect.

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

[0161] In some embodiments, in combination with Figure 6 As shown, the thickness of the protective patch 5 is defined as k, satisfying: 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 slotted portion 11, it prevents the protective patch 5 from being too thin and the slotted portion 11 from being too wide, avoiding the situation that the protective patch 5 is too thin and is easily damaged and fails to play a 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 slotted portion 11, it prevents the protective patch 5 from being too thick and the slotted portion 11 from being too small, avoiding the situation that the protective patch 5 is too thick and occupies the gap space reserved between the wire harness plate 1 and the explosion-proof valve 31, thereby reducing the exhaust space of the spray and affecting the spray of the high-temperature medium.

[0163] In some embodiments, the protective patch 5 is fixed to one side of the support portion 32 facing the wire 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, ensuring the gap space reserved between the wire harness plate 1 and the explosion-proof valve 31, and ensuring the smooth spray of the high-temperature medium.

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

[0166] In some embodiments, the projection of the protective patch 5 towards 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 towards the first surface, so that the protective patch 5 protects the entire thinned portion 312 of the explosion-proof valve from contamination. Dust and other impurities are prevented from falling through the slitted portion 11 and onto the thinned portion 312 of the explosion-proof valve 31. Corrosion or damage to the thinned portion 312 is avoided, improving safety performance.

[0168] In some embodiments, in combination with Figure 6 , Figure 7 As shown in FIG. 11, the cover plate 33 further comprises a support portion 32 surrounding the outer periphery of the explosion-proof valve 31. The support portion 32 is provided with a gas 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.

[0169] The gas guide groove 321 penetrates through the support portion 32 along the thickness direction of the support portion 32.

[0170] In a direction parallel to the plane in which the explosion-proof valve 31 is located and perpendicular to the thickness direction of the support portion 32, the maximum width of the gas 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, a gas storage chamber is formed by the protective patch 5, the explosion-proof valve 31, and the support portion 32.

[0172] By arranging the gas guide groove 321 to penetrate through the support portion 32, the gas storage chamber is connected to the outside, facilitating helium detection.

[0173] By limiting the ratio of the maximum width of the gas guide groove 321 to the width of the slitted portion 11, when the maximum width of the gas guide groove is large, the high-temperature medium can quickly melt the protective patch. At this time, the width of the slitted portion 11 can be set to be relatively small.

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

[0175] In some embodiments, in combination with Figure 6 , Figure 7 As shown in FIG. 11, the cover plate 33 further comprises a support portion 32 surrounding the outer periphery of the explosion-proof valve 31. The support portion 32 is provided with a gas 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.

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

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

[0178] When the projection of the slotted portion 11 toward the first surface overlaps the air guide groove 321, the high-heat medium can more quickly melt the slits of the slotted portion 11 to expand them, and at this time, the width of the slotted portion 11 can be set to be relatively narrow.

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

[0180] When the projection of the slotted portion 11 toward the first surface does not overlap the air guide groove 321, the speed at which the high-heat medium melts the slits of the slotted portion 11 is slower, that is, the expansion speed of the slotted portion 11 is slower, and at this time, the width of the slotted portion 11 can be set to be relatively wide 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 close to the wire harness plate 1 to the side away from the wire harness plate 1.

[0182] In some embodiments, the protective patch 5 is adhesively connected to the support portion 32. By adhesively connecting, the assembly can be convenient and fast.

[0183] In some embodiments, the overlapping region of the protective patch 5 and the support portion 32 is at least partially provided with a glue layer for bonding, and in a direction perpendicular to the plane in which the protective patch 5 is located, the glue layer is partially notched to make the glue layer not overlap the projection of the air guide groove 321.

[0184] The glue layer is partially notched to make the glue layer not overlap the projection of the air guide groove 321, which can avoid the glue layer blocking the air guide groove 321, prevent affecting helium detection, and avoid poor exhaust.

[0185] In some embodiments, in a direction parallel to the plane in which 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 locally formed by the adhesive layer, when the ratio is too large, it means that the air guide groove 321 is too wide and the adhesive layer gap is too 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 adhesive layer gap 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 part 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 part 32 is not provided with the air guide groove 321.

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

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

[0190] By providing the notch 51 on the protective patch 5, and the notch 51 penetrates the protective patch in the thickness direction of the protective patch 5. The notch 51 is in a closed state in normal state, that is, the air storage chamber formed by the protective patch 5, the explosion-proof valve 31 and the support part 32 is a sealed chamber. When the battery is subjected to air tightness detection, the notch 51 can be in an open state under the action of a pre-set pressure, so that the air storage chamber is a non-sealed chamber. The setting of the notch 51 can effectively protect the explosion-proof valve 31 in the normal use state, and the notch can be used for air tightness detection of the battery, so as to improve the performance of the battery.

[0191] The total length of the notch 51 refers to the length of the notch 51 extending in the plane of the protective patch 5. When the notch 51 is multiple or the notch 51 is 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 slotted part 11, the longer the total length of the notch 51, and the easier it is for the high-temperature medium to break through the protective patch 5, which is conducive to the diffusion of the high-temperature medium. At this time, the width of the slotted part 11 can be set smaller; on the contrary, the smaller the ratio of the total length of the notch 51 to the width of the slotted part 11, the shorter the total length of the notch 51, and the more difficult it is for the high-temperature medium to break through the protective patch 5, which is not conducive to the diffusion of the high-temperature medium. At this time, the width of the slotted part 11 can be set larger. However, the total length of the notch 51 should not be too long, so as to avoid the strength of the protective patch 5 being poor and the protective patch 5 being easily damaged.

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

[0194] In some other embodiments, the preferred range of q / b can 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 0.1mm≤k≤0.3mm.

[0196] If the thickness of the protective patch 5 is too large, it will be difficult for the notch 51 to open during the airtightness detection process, which will affect the detection accuracy. If the thickness of the protective patch 5 is too small, the protective patch 5 may be in an open state in a natural state, and foreign matters such as electrolyte, water, metal chips, and dust are likely to enter the inside of the protective patch 5, which will cause a battery safety risk.

[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, it will be difficult for the notch 51 to open under a certain 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 is too long, or the thickness of the protective patch 5 is too small, so that the protective patch 5 on both sides of the notch 51 cannot support each other, the notch 51 is easy to open in a natural state, and the structural strength is also low.

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

[0199] In some embodiments, in the direction perpendicular to the plane where the protective patch 5 is located, the area of the region surrounded by the circumferential edge of the protective patch 5 is s, and in the direction perpendicular to the plane where the cover plate 33 is located, the area of the region surrounded by the circumferential edge of the cover plate 33 is t, which satisfies 300mm 2 ≤s≤1500mm 2 , and 0.015≤s / t≤0.75.

[0200] By limiting the area s of the region surrounded by the circumferential edge of the protective patch 5, the protective patch 5 can have sufficient protection area, and the area of the protective patch 5 will not be too large, so as to improve the use performance of the protective patch 5.

[0201] By limiting the upper limit of s / t, the material waste caused by the too large 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 reliably protect the explosion-proof valve 31.

[0202] In the embodiment, the area t of the region surrounded by the circumferential edge of the cover plate 33 is in the range of 2000mm 2 ≤t≤20000mm 2 . The area t of the region surrounded by the circumferential edge of the cover plate 33 can be 2000mm 2 or 4000mm 2 or 8000mm 2 or 12000mm 2 or 15000mm 2 or 17000mm 2 or 18000mm 2 or 20000mm 2 , etc.

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

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

[0205] In some embodiments, as shown in Figure 11 , at least part of the score line 51 is not on a straight line, so that the protective patch 5 forms at least one cantilever portion 52; the cantilever portion 52 comprises a first end point 501 and a second end point 502, at least part of the score line 51 is continuous from the first end point 501 to the second end point 502, the area of the cantilever portion 52 is v, the area of the cantilever portion 52 is the area surrounded by the line connecting the first end point 501 and the second end point 502 and the score line 51 between the first end point 501 and the second end point 502, and satisfies: 1.1mm 2 ≤v≤12.5mm 2 .

[0206] The protective patch 5 is provided with a score line 51 to form at least one cantilever part 52. The area of the cantilever part 52 can be considered as the area enclosed by the connecting line between the two points of the score line segment and the score line segment forming the cantilever part 52. For example, one cantilever part 52 can include two intersecting score line segments, so that the two intersecting score line segments form a triangular cantilever part, and the area of the cantilever part 52 is the area of the triangle. Or, one cantilever part 52 can include a semicircle, i.e., a semicircular cantilever part, and the area of the cantilever part 52 is the area of the semicircle. For example, Figure 11 As shown in the structure, the score line 51 is a curve, and the area of the cantilever part 52 is the area v shown in the figure. For example, Figure 10 As shown in the structure, the score line 51 is a cross line, and four cantilever parts 52 are formed around the cross line. When there are multiple cantilever parts 52, the area of each cantilever part 52 is v.

[0207] By limiting the upper limit of the area of the cantilever part 52, it can be ensured that the score line 51 is in a closed state under normal conditions, i.e., it can reliably seal the protective patch 5, the explosion-proof valve 31 and the support part 32 to form a gas storage chamber, avoid the protective patch 5 from sagging, prevent foreign matter from entering the explosion-proof valve 31, and improve the safety performance of the battery.

[0208] At the same time, by limiting the lower limit of the area of the cantilever part 52, it can be ensured that the score line 51 can be smoothly opened during the airtightness detection process, i.e., the cantilever part 52 formed by the score line 51 can be opened under a predetermined pressure, for airtightness detection of the battery, and improve the test efficiency and accuracy of the airtightness detection, while the opening of the protective patch 5 does not deform too much, does not affect the normal use of the protective patch 5 for a long time, thereby improving the service life of the protective patch 5.

[0209] In some embodiments, in combination with Figure 15 As shown, the projection of the slotted part 11 towards the protective patch 5 at least partially overlaps with the score line 51. Thus, it can be ensured that the high-temperature medium can be smoothly discharged, and the gas conduction is faster.

[0210] In some other embodiments, the projection of the slotted part 11 towards the protective patch 5 does not overlap with the score line 51, and the minimum distance between the projection of the slotted part 11 on the protective patch 5 and the score line 51 is w, which satisfies: w≤30mm.

[0211] By making the projection of the slotted part 11 towards the protective patch 5 not overlap with the score line 51, it can be avoided that electrolyte, water, metal chips, dust and other foreign matter easily enter the gas storage chamber formed by the protective patch 5, the explosion-proof valve 31 and the support part 32.

[0212] And by limiting the upper limit of the minimum distance between the projection of the protective patch 5 and the score 51, the situation where the distance is too far to facilitate the expansion of the slotted part 11 is avoided.

[0213] In some embodiments, the battery assembly further comprises: an insulating top plate 4 arranged between the cover plate 33 and the harness plate 1.

[0214] In the direction perpendicular to the plane where the harness plate is located, the distance between the surface of the insulating top plate close to the harness plate and the cover plate body is K1, and the distance between the surface of the protective patch close to the 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 harness plate 1 is flush with the surface of the protective patch 5 close to the 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 harness plate 1, ensuring the support effect on the harness plate 1, and being soft support to avoid damaging the harness plate 1.

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

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

[0219] In some embodiments, in combination with Figure 3 As shown, the harness plate 1 comprises a harness plate body 10 and a collection branch 12 formed in at least a part of the area of the harness plate 1, and a cutting slot 13 is arranged between the harness plate body 10 and the collection branch 12. Along the width direction perpendicular to the slotted part 11, the vertical distance from the root of the cutting slot 13 connected to the main road to the edge of the slotted part 11 close to the root is x, satisfying: 5mm≤x≤30mm.

[0220] The root of the cutting slot 13 connected to the main road refers to the area where the collection branch 12 is connected to the harness plate body 10.

[0221] By limiting the lower limit of the minimum distance between the cutting slot 13 and the slotted part 11, it is avoided that the main body strength of the harness plate body 10 is insufficient due to the cutting slot 13 and the slotted part 11 being too close, and the cutting slot 13 and the slotted part 11 being too small is not convenient for wiring arrangement.

[0222] By limiting the upper limit of the minimum distance between the cutting slot 13 and the slotted part 11, it is avoided that the material is wasted due to the overall size of the harness plate 1 being too large.

[0223] In some embodiments, when the projection of the cutting slit 13 towards the first surface at least partially overlaps with the explosion valve 31, it is satisfied that 2mm≤b≤20mm.

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

[0225] In some embodiments, in combination with Figure 3 As shown in the figure, the length direction of the slitted portion 11 is parallel to the length direction of the wire harness plate 1, and along the width direction of the slitted portion 11, the overall width of the wire harness plate 1 is z, and it is satisfied that 0.1≤y / z≤0.8.

[0226] When the ratio of the slit width of the cutting slit 13 to the overall width of the wire harness plate 1 is too large, the slit width of the cutting slit 13 is too large, and the space left for the wire harness plate 1 is less; and when the ratio of the slit width of the cutting slit 13 to the overall width of the wire harness plate 1 is too small, the slit width of the cutting slit 13 is too small, which is not conducive to the rapid diffusion of the high-temperature medium.

[0227] In some embodiments, in combination with Figure 12 As shown in the figure, the wire harness plate 1 further includes a fuse 14, and along the width direction of the slitted portion 11, the minimum distance between the fuse 14 and the slitted portion 11 is A, and it is satisfied that 1mm≤A≤10mm.

[0228] When the minimum distance A between the fuse 14 and the slitted portion 11 is lower than the lower limit, the fuse 14 is too close to the slitted portion 11, that is, the fuse 14 is too close to the explosion valve 31, and then the high-temperature medium after the explosion valve 31 is opened can damage the fuse 14, and the fuse 14 cannot play a role in protecting the circuit of the wire harness plate 1. When the minimum distance A between the fuse 14 and the slitted portion 11 is higher than the upper limit, the fuse 14 is too far away from the slitted portion 11, that is, the fuse 14 is too far away from the explosion valve 31, which leads to an increase in the size of the product, and the product is not easy to realize.

[0229] The wire harness plate 1 is internally provided with a plurality of core conductive wires 16, and the core conductive wire 16 can be a copper wire. The fuse 14 is formed by a portion with a reduced diameter of the core conductive wire 16.

[0230] When the fuse 14 is close to the collection branch 12, 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 diameter of the fuse 14 is B, and it is satisfied that 0.1mm≤B≤0.3mm.

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

[0234] By limiting the wire diameter parameter of the fuse 14, it can be ensured that the fuse 14 fuses quickly when a short circuit occurs, improving safety performance.

[0235] In some embodiments, the fuse 14 is S-shaped.

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

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

[0238] Since the fuse is formed by elongating and thinning the core conductive wire 16 on the main path, when the single core conductive wire 16 is thinner, the length of the fuse formed by elongating the thinner main body to a fixed wire diameter is shorter.

[0239] At this time, the wider the width of the slotted portion 11, the smaller the overall wire harness plate 1 wire arrangement space, and in the case of a fixed number of acquisitions, that is, a fixed number of wiring, the thinner the single core conductive wire 16, the shorter the length of the fuse formed accordingly, and the faster the fusing time.

[0240] However, the fuse length cannot be too short, otherwise it does not meet the fusing time requirement.

[0241] That is, the smaller the ratio of the length of the fuse 14 to the width of the slotted portion 11, the shorter the length of the fuse 14, and the larger the width of the slotted portion 11, that is, the thinner the single core conductive wire 16, and the faster the fusing time of the fuse. When the fusing time requirement is met, the faster the fusing time of the fuse is better. Conversely, the larger the ratio of the length of the fuse 14 to the width of the slotted portion 11, the longer the length of the fuse 14, and the smaller the width of the slotted portion 11, that is, the thicker the single core conductive wire 16, and the slower the fusing time of the fuse. Exceeding a certain limit value can easily cause safety hazards.

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

[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, the plurality of battery cells 3 are stacked to form the battery column 2, and the slit 11 continuously extends along the stacking direction of the battery cells 3.

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

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

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

[0256] The gap between two adjacent battery cells 3 is arranged corresponding to the spacing part, which can prevent dust falling, avoid dust entering the gap between two adjacent battery cells 3, and improve safety performance. At the same time, the overall strength of the harness plate 1 can be improved.

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

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

[0259] ① Low temperature test: place for 1000 hours under the condition of temperature -40℃, during the test process, every 250h, 500h, 1000h, the appearance of the sample is checked, and the resistance value of each NTC at room temperature is tested and the environmental temperature is recorded (note that the FPC should be placed in room temperature for 10min, and the resistance value test should be carried out after the FPC temperature is the same as the room temperature), and each resistance value test should be completed within 24±2h.

[0260] ② High temperature test: place for 1000 hours under the condition of temperature 85℃, during the test process, every 250h, 500h, 1000h, the appearance of the sample is checked, and the resistance value of each NTC at room temperature is tested and the environmental temperature is recorded (note that the FPC should be placed in room temperature for 10min, and the resistance value test should be carried out after the FPC temperature is the same as the room temperature), and each resistance value test should be completed within 24±2h.

[0261] After the low temperature test, the FPC performance is normal, meets the insulation voltage resistance requirement, the appearance is not damaged, there is no breakage, no glue cracking and other defects, and after the test, the NTC resistance value at 25℃ is tested, compared with the corresponding resistance value in the RT table, the error is required to be ≤±1℃.

[0262] After high temperature test, the FPC performance is normal to meet the insulation withstand voltage requirements, the appearance is not damaged, no breakage, no glue cracking and other defects, after test, test the NTC resistance at 25℃, compare with the corresponding resistance in RT table, the error is required to be ≤±1℃.

[0263] The insulation performance parameters of the wire harness plate 1 meet: ① The insulation resistance and withstand voltage leakage current between each collection line of the FPC meet: insulation resistance ≥ 100MΩ@1000VDC (60S), withstand voltage leakage current ≤ 1mA@1000VDC (60S), no flashover and breakdown in the test;

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

[0265] The specific test method of the insulation performance of the wire harness plate 1 is as follows:

[0266] ① The test method of the insulation resistance and withstand voltage leakage current between each collection line of the FPC is: 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 leakage current value between adjacent collection lines through the connector, read the leakage current value and record it (Note: the positive and negative loops 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 test method of the insulation resistance and withstand voltage leakage current between the FPC and the insulation layer is: 1. Adjust the voltage value of the insulation withstand voltage tester to 1000V DC, test the insulation resistance between any collection line of the FPC and the outer surface of the FPC insulation layer, read the measured resistance value and record it. 2. Adjust the voltage value of the insulation withstand voltage tester to 2800V DC, test the withstand voltage leakage current value between any collection line of the FPC and the outer surface of the FPC insulation layer, read the measured leakage current value and record it. (Note: the positive and negative loops of the same NTC should be combined into one wire, and multiple wires at the same collection point should be combined into one wire).

[0268] In some embodiments, the battery monomer 3 includes a shell 35, the shell 35 is a steel shell, the size a of the residual part 311 meets: 10mm≤a≤15mm;

[0269] And meet: 0.033≤b / a≤2.

[0270] The shell 35 is a steel shell, because the melting point of steel is high and the hardness is large, so that the opening valve pressure is large, and the impact of the gas pressure after the opening valve on the wire harness plate 1 is larger, at this time, the width of the slit part 11 can be appropriately reduced.

[0271] The residual part 311 can be appropriately enlarged, and the residual part 311 is connected to other areas of the shell or the cover plate more, and the rupture disc is more difficult to break the residual part 311 after being stressed, so that the rupture disc is not easily ejected.

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

[0273] In some embodiments, the battery monomer 3 comprises a pole 34, and the pole 34 and the explosion-proof valve 31 are arranged on the same side surface of the battery monomer 3, the explosion-proof valve 31 is located between the poles 34 of two polarities, and the explosion-proof valve 31 and the pole 34 are arranged in a spaced manner; the length dimension of the first surface is defined as L, and satisfies: 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 monomer 3, the explosion-proof valve 31 is located between the poles 34 of two polarities, and the explosion-proof valve 31 and the pole 34 are arranged in a spaced manner; when the explosion-proof valve 31 is opened, it is not desirable that the high-temperature medium is ejected onto the pole, so as to avoid further triggering short circuit and heat spread, so the space left for the explosion-proof valve 31 and the wire harness plate 1 located above the explosion-proof valve 31 is limited, and the explosion-proof valve 31 and the wire harness plate 1 cannot be too wide, and in order to achieve the weight loss ratio in a short time, the area of the explosion-proof valve 31 also cannot be too small, so by limiting the lower limit of c / L, the insufficient valve opening area caused by the too small area of the explosion-proof valve 31 is avoided, and by limiting the upper limit of c / L, the explosion-proof valve 31 and the pole are prevented from being too close to prevent the high-temperature medium from being ejected onto the pole.

[0275] And further limit the upper limit of b / c, avoid the width of the slit part 11 being too large, prevent the case of insufficient wire arrangement space under the condition that the width of the wire harness plate 1 itself is limited; by limiting the lower limit of b / c, avoid the width of the slit part 11 being too small and not conducive to pressure relief.

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

[0277] Since the pole 34 and the explosion-proof valve 31 are arranged on different side surfaces of the battery monomer 3, when the explosion-proof valve 31 is opened, since there is no space limitation of the pole, the high-temperature medium will not be ejected onto the pole, so the range of c / L can be appropriately increased. And further limit the upper limit of b / c, avoid the width of the slit part 11 being too large, prevent the case of insufficient wire arrangement space under the condition that the width of the wire harness plate 1 itself is limited; by limiting the lower limit of b / c, avoid the width of the slit part 11 being too small and not conducive to pressure relief.

[0278] As one of the implementation forms, the explosion-proof valve 31 is arranged on the top surface of the battery monomer 3.

[0279] When the explosion-proof valve 31 is arranged on the top surface of the battery monomer 3, since it is desired that the heat quickly spreads, the heat is prevented from being too concentrated and accumulated to burst the cover and even reach the passenger compartment, and the width of the slotted part 11 can be appropriately increased.

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

[0281] When the explosion-proof valve 31 is arranged on the side surface of the battery monomer 3, since the safety risk of the side surface is low, the heat is not easy to be too concentrated and accumulated to burst the cover and even reach the passenger compartment, and thus the high-heat medium is allowed to be concentrated to a certain extent, and the width of the slotted part 11 can be appropriately reduced.

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

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

[0284] By making the projection of the slotted part 11 on the cover plate 33 not overlap the liquid injection hole 331, it can be avoided that foreign matters such as electrolyte, water, metal chips and dust fall on the liquid injection hole 331 from the slotted part 11, and the liquid injection hole 331 is prevented from being damaged.

[0285] By limiting the lower limit of the minimum distance between the projection of the slotted part 11 on the cover plate 33 and the liquid injection hole 331, the erosion of the liquid injection hole 331 by foreign matters can be avoided, and at the same time, by limiting the upper limit of the minimum distance between the projection of the slotted part 11 on the cover plate 33 and the liquid injection hole 331, the size parameters of the overall battery can be reasonably controlled, and unreasonable layout and material waste can be avoided.

[0286] In the embodiment, the minimum distance I between the projection of the slotted part 11 on the cover plate 33 and the liquid injection hole 331 can be 5 mm or 10 mm or 15 mm or 20 mm or 40 mm or 50 mm or 60 mm or 75 mm or 85 mm or 100 mm or 120 mm or 160 mm or 170 mm or 188 mm, or 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, and the following condition is satisfied: 0.0004 mm / Ah≤b / J≤0.5 mm / Ah.

[0288] Since the battery capacity and the weight loss ratio required to be reached when the explosion-proof valve is opened are related, the larger the battery capacity is, the wider the width of the slotted portion 11 needs to be, so as to avoid not reaching the weight loss ratio requirement.

[0289] In some embodiments, the battery cell 3 comprises a shell 35, the shell 35 is provided with an opening portion, and the battery cell 3 further comprises a cover plate 33 arranged on the opening portion, the cover plate 33 and the shell 35 jointly form a containing cavity, the length of the containing cavity is in the range of 100 mm-380 mm, the width of the containing cavity is in the range of 50 mm-250 mm, and the thickness of the containing cavity is in the range of 15 mm-100 mm.

[0290] According to the embodiments of the present application, in another aspect, a battery pack is also provided, comprising: the battery assembly as described above;

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

[0292] Obviously, the above embodiments are only examples for clearly illustrating, and are not a limitation on the embodiments. Although the embodiments of the present application are described in conjunction with the drawings, various modifications and variations can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and variations fall within the scope of the present application.

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); The battery capacity of the battery cell (3) is defined as J, which satisfies the following conditions: 0.0004 mm / Ah≤b / J≤0.5 mm / Ah.

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

3. The battery assembly according to claim 1, wherein: 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); And / or, the support portion (32) is provided on both sides of the explosion-proof valve (31) in the width direction and extends along the length direction of the explosion-proof valve (31).

4. The battery assembly according to claim 1, wherein: The support portion (32) is arranged around the explosion-proof valve (31).

5. The battery assembly according to claim 4, characterized in that The support portion (32) is of a runway type.

6. The battery assembly according to claim 1, wherein: The support portion (32) and the cover plate (33) are integrally formed; the cover plate (33) is a metal part.

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

8. The battery assembly according to claim 1, wherein: 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.

9. 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.

10. A battery pack, characterized in that: include: The battery assembly according to any one of claims 1 to 9; 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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