Battery arrangement and battery pack

Abstract

Battery assembly comprising: a battery cell (3) with a housing (35), wherein the housing (35) has an explosion-proof valve (31); wherein a surface of the housing (35) on which the explosion-proof valve (31) is arranged is defined as a first surface; wherein the explosion-proof valve (31) has a non-closed tapered portion (312), wherein the tapered portion (312) is configured such that gas can be released from the interior of the battery cell (3) by breaking through the tapered portion (312); and a residual portion (311) located in a non-closed region of the tapered portion (312), wherein the tapered portion (312) and the residual portion (311) together form a continuous closed ring pattern; wherein, in a direction perpendicular to the first surface, the thickness of the residual portion (311) is greater than the thickness of the tapered portion (312); a wiring harness board (1), wherein the wiring harness board (1) has an information acquisition module configured to detect the battery temperature and / or the voltage of at least one battery cell (3); wherein the wiring harness board (1) is arranged on the side of the battery cell (3) having the explosion-proof valve (31); wherein the wiring harness board (1) is formed with a slit portion (11), wherein the slit portion (11) penetrates upper and lower surfaces of the wiring harness board (1) and thus forms a gap; wherein the projection of the slit portion (11) on the first surface at least partially overlaps the explosion-proof valve (31); wherein two ends of the tapered portion (312) form a first end point and a second end point, wherein a region between the first end point and the second end point of the tapered portion (312) forms the remaining portion (311), and wherein a straight-line distance between the first end point and the second end point is defined as a dimension a of the remaining portion (311); wherein, in the width direction of the slit portion (11), the width of the slit portion (11) is defined as b; wherein a dimension of the explosion-proof valve (31) is defined as c, where c > b and 0.01 ≤ b / a ≤ 12.

Description

Technical area

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

[0002] A battery generates a large amount of mixed gases and continuously builds up pressure during thermal runaway, and by installing an explosion-proof valve on a battery cell, a pressure-relieving and explosion-preventing effect can be achieved.

[0003] In the current technology, a flexible printed circuit (FPC) is placed on the side of the battery cell where a terminal protrudes, after stacking multiple battery cells to form a battery module. The FPC can perform testing and monitoring of information such as battery voltage and temperature. Placing the FPC over the explosion-proof valve can prevent the explosion-proof element from being forcibly ejected; however, the FPC also blocks the discharge of gases during thermal runaway, which is not conducive to the diffusion of a high-temperature thermal medium. Summary

[0004] In view of the above, the present application provides a battery assembly and a battery pack to solve the problem that an FPC cannot satisfy the need for diffusion of a high-temperature thermal medium while preventing the forcible repulsion of an explosion-proof element.

[0005] In a first aspect, the present application provides a battery assembly comprising: a battery cell having a housing, the housing having an explosion-proof valve; wherein a surface of the housing on which the explosion-proof valve is arranged is defined as a first surface; the explosion-proof valve comprises a non-closed tapered portion, wherein the tapered portion is configured so that gas can be released from the interior of the battery cell by breaking through the tapered portion; and a residual portion located in a non-closed area of ​​the tapered portion, wherein the tapered portion and the remaining portion forms a continuous closed ring pattern; in a direction perpendicular to the first surface, a thickness of the remaining portion is greater than the thickness of the tapered portion; a wiring harness board, the wiring harness board comprising an information acquisition module configured to detect the battery temperature and / or the voltage of the battery cell; the wiring harness board being arranged on the side of the battery cell having the explosion-proof valve; the wiring harness board being formed with a slit portion, the slit portion penetrating upper and lower surfaces of the wiring harness board, thus forming a gap; the projection of the slit portion on the first surface at least partially overlapping the explosion-proof valve; A dimension of the remaining portion is defined as a; in a width direction of the slot portion, a width of the slot portion is defined as b, and a dimension of the explosion-proof valve is defined as c, where c > b, and 0.01 ≤ b / a ≤ 12.

[0006] Advantageous effects: By limiting the width b of the slot portion, because if the width of the slot portion is excessively large, the wiring harness board will undergo thermal shrinkage after being heated by a high-temperature thermal medium, so that the width of the slot portion will further increase, which will facilitate the forcible repulsion of an explosion-proof element; and if the width of the slot portion is excessively small, although it can effectively prevent the forcible repulsion of the explosion-proof element, the narrow slot will also hinder the diffusion of the high-temperature thermal medium and the rapid opening of the explosion-proof valve.

[0007] By limiting the dimension a of the residual portion in the width direction of the slot portion, because if the dimension of the residual portion is excessively small, the residual portion has fewer connections with other portions of the casing or a cover plate, and the explosion-proof element becomes prone to breaking through the residual portion and being forcibly repelled under the action of force; and if the dimension of the residual portion is excessively large, it leads to a corresponding decrease in a dimension of the tapered portion, resulting in an excessively small valve opening area of ​​the explosion-proof valve, which is not conducive to rapid diffusion of the high-temperature thermal medium.

[0008] By restricting a ratio range of the width b of the slot portion to the dimension a of the remaining portion, because if the ratio is excessively large, it indicates excessive width of the slot portion and excessive shortness of the remaining portion, and the explosion-proof element is prone to violent repulsion; and if the ratio is excessively low, it indicates excessive narrowness of the slot portion and excessive length of the remaining portion, which is not conducive to diffusion of the high-temperature thermal medium.

[0009] In a second aspect, the present application further provides a battery pack comprising the battery assembly as described above; a base plate, wherein the battery cell is positioned on the base plate, and the wiring harness board is arranged on a side of the battery cell facing away from the base plate.

[0010] Since the battery pack includes the battery assembly, the battery pack has the same effects as the battery assembly, so a detailed description thereof is omitted here for the sake of brevity. Short description of the drawings

[0011] The accompanying drawings, which are intended to be used to describe specific embodiments or the prior art, are briefly presented below to clarify the technical solutions of specific embodiments of the present application or the prior art. It is understood that the accompanying drawings in the following description merely illustrate some embodiments of the present application. A person of ordinary skill in the art can also create additional drawings based on these accompanying drawings without any creative effort. Fig.1 is a schematic exploded view of a battery assembly according to the present application; Fig. 2 is a schematic diagram of the assembled state of a battery cell and a wire harness board according to the present application; Fig. 3 is a plan view of an assembled state of a battery cell and a wire harness board according to the present application; Fig. 4 is an enlarged partial view of a wire harness board according to the present application; Fig. 5 is a sectional view of a battery cell according to the present application; Fig. 6 is a first enlarged partial view of Fig. 5; Fig. 7 is a second enlarged partial view of Fig. 5; Fig. 8 is a sectional view of an insulating top plate disposed between a battery cell and a wire harness board according to the present application; Fig. 9 is a schematic diagram of a cover plate according to the present application; Fig. 10 is a first schematic diagram of a protective overlay according to the present application; Fig. 11 is a second schematic diagram of a protective overlay according to the present application; Fig. 12 is a schematic diagram of the interior of a wiring harness board according to the present application; Fig. 13 is a first schematic diagram of a positional relationship between a battery cell and a slit portion according to the present application; Fig. 14 is a second schematic diagram of a positional relationship between a battery cell and a slit portion according to the present application; Fig. 15 is a third schematic diagram of a positional relationship between a battery cell and a slit portion according to the present application; Fig.16 is a fourth schematic diagram of a positional relationship between a battery cell and a slit portion according to the present application; Fig. 17 is a fifth schematic diagram of a positional relationship between a battery cell and a slit portion according to the present application; Fig. 18 is a first schematic diagram illustrating an embodiment in which the longitudinal direction of the remaining portions of a plurality of adjacent battery cells is parallel to the longitudinal direction of a first surface; Fig. 19 is a first schematic diagram illustrating an embodiment in which the longitudinal direction of the remaining portions of two adjacent battery cells is parallel to the width direction of the first surface; Fig.20 is a second schematic diagram illustrating an embodiment in which the longitudinal direction of the remaining portions of two adjacent battery cells is parallel to the longitudinal direction of the first surface; Fig. 21 is a third schematic diagram illustrating an embodiment in which the longitudinal direction of the remaining portions of two adjacent battery cells are parallel to a width direction of the first surface. Description of reference symbols:

[0012] 1, wiring harness board; 10, wiring harness board body; 11, slotted portion; 12, detection branch circuit; 13, cutting slot; 14, fuse; 15, protective film; 16, conductive core wire; 17, spacer portion; 2, battery series; 3, battery cell; 31, explosion-proof valve; 311, residual portion; 312, tapered portion; 32, support portion; 321, air guide groove; 33, cover plate; 331, liquid injection hole; 34, pole; 35, housing; 4, insulating top plate; 5, protective overlay; 51, notch; 52, projection section; 501, first end point; 502, second end point; 6, clearance section. DETAILED DESCRIPTION

[0013] To clarify the objectives, technical solutions, and advantages of embodiments of the present application, the technical solutions in the embodiments of the present application are clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. It is understood that the described embodiments are a part of the embodiments of the present application and not all embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative effort fall within the scope of the present application.

[0014] In the description of the present application, it should be noted that terms such as "center," "above," "below," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate orientation or positional relationships, are based on the orientations or positional relationships in the accompanying drawings and are used only to conveniently describe the present application and simplify the description. They do not indicate or imply that the device or element referred to must have a particular orientation or be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be understood as indicating or implying a hierarchical meaning.

[0015] It should be noted that in the description of the present application, the terms "installed," "connected," and "connection" are to be understood broadly unless expressly stated and limited otherwise. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or indirect connection via an intermediate element, or it may be an internal communication between two elements. A person skilled in the art will understand the specific meanings of the above terms in the present application according to specific situations.

[0016] Furthermore, the technical features involved in the various embodiments of the present application described below may be combined with each other as long as they do not contradict each other.

[0017] To conveniently and clearly describe the positional relationships of various structures in embodiments of the present application, directions and orientations will be described first. A surface of the housing 35 having the explosion-proof valve 31 is a first surface, a longitudinal direction of the slot portion 11 is a first direction, and a width direction of the slot portion 11 is a second direction, with the first direction and the second direction being perpendicular to each other.

[0018] It should be noted that the longitudinal direction of the slot portion 11 is the first direction, where the longitudinal direction of the slot portion 11 refers to a longitudinal direction of a gap formed to penetrate the upper and lower surfaces of the wire harness board; the width direction of the slot portion 11 is the second direction, where the width direction of the slot portion 11 refers to a width direction of the gap formed to penetrate the upper and lower surfaces of the wire harness board; here, the longitudinal direction of the gap formed to penetrate the upper and lower surfaces of the wire harness board is larger than the width direction of the gap formed to penetrate the upper and lower surfaces of the wire harness board. Embodiments of the present application will be described below with reference to the Fig. 1 to 21 described.

[0019] According to one embodiment of the present application, a battery arrangement is provided, which comprises the following: a battery cell 3 with a housing 35, wherein the housing 35 has an explosion-proof valve 31, and wherein the surface of the housing 35 having the explosion-proof valve 31 is defined as the first surface. The explosion-proof valve 31 includes a non-closed tapered portion 312, wherein the tapered portion 312 is configured to allow gases from the interior of the battery cell 3 to relieve pressure by breaking through the tapered portion 312; and a residual portion 311 in a non-closed area of ​​the tapered portion 312, wherein the tapered portion 312 and the residual portion 311 together form a continuous closed ring pattern; and the thickness of the residual portion 311 is greater than the thickness of the tapered portion 312 in a direction perpendicular to the first surface; a wiring harness board 1, wherein the wiring harness board 1 includes an information acquisition module configured to detect the battery temperature and / or the voltage of at least one battery cell 3; located on a side of the battery cell 3 having the explosion-proof valve 31; wherein the wiring harness board 1 is formed with a slit portion 11, wherein the slit portion 11 is provided to penetrate upper and lower surfaces of the wiring harness board 1 and thus form a gap; wherein the projection of the slit portion 11 on the first surface at least partially overlaps the explosion-proof valve 31; Two ends of the tapered portion 312 form a first end point and a second end point, and a region between the first end point and the second end point of the tapered portion 312 forms a remaining portion 311 and defines a straight-line distance between the first end point and the second end point to define a dimension a of the remaining portion 311, along a width direction of the slit portion 11 to define a width of the slit portion 11 as b, and to define a dimension of the explosion-proof valve 31 as c, where c > b and 0.01 ≤ b / a ≤ 12.

[0020] By providing the tapered portion 312, upon thermal runaway of the battery cell 3, the explosion-proof valve 31 ruptures along a portion of the tapered portion 312 to achieve gas release. Furthermore, the residual portion 311 is provided, and along a direction perpendicular to a plane on which the explosion-proof valve 31 is located, the thickness of the residual portion 311 is greater than the thickness of the tapered portion 312, so that when the explosion-proof valve 31 ruptures along the portion of the tapered portion 312, the residual portion 311 can still remain connected to other areas of the housing or a cover plate, preventing a complete explosion-proof element from being forcibly ejected.

[0021] The wiring harness board 1 is arranged on one side of the battery cell 3 having the explosion-proof valve 31, so that the wiring harness board 1 can press on the explosion-proof valve 31 and thus plays a role in preventing the entire explosion-proof element from being pushed off by force.

[0022] Meanwhile, the wire harness board 1 is formed with a slit portion 11 having a projection on the battery cell 3, which at least partially overlaps the tapered portion 312. This arrangement helps prevent interference with the proper rupture of the explosion-proof valve 31 and ensures smooth gas discharge after the explosion-proof valve 31 is ruptured. Since the wire harness board 1 has a sheet-like structure, its upper surface indicates a side of the wire harness 1 facing away from the battery cell 3, and its lower surface indicates a side of the wire harness board 1 near the battery cell 3. The upper and lower surfaces of the wire harness board 1 are penetrated to form a gap, so that the slit portion 11 is formed.

[0023] By limiting the dimension of the width b of the slit portion 11, when the width of the slit portion 11 is excessively large, the wire harness board 1 undergoes thermal shrinkage after being heated by a high-temperature thermal medium, so that the width of the slit portion 11 further increases, resulting in an explosion-proof element being easily forcibly repelled; and when the width of the slit portion 11 is excessively small, although forcible repelling of the explosion-proof element can be suppressed, this also hinders the diffusion of the high-temperature thermal medium and rapid rupture of the explosion-proof valve 31.

[0024] By limiting the dimension a of the residual portion 311 along the width direction of the slit portion 11, when the dimension of the residual portion 311 is excessively small, the residual portion 311 has fewer connections with other portions of the housing or a cover plate, so that it becomes susceptible to being torn by the explosion-proof element under force, resulting in the explosion-proof element being forcibly repelled; when the dimension of the residual portion 311 is excessively large, this results in a corresponding decrease in a dimension of the tapered portion 312, resulting in an excessively small valve opening area of ​​the explosion-proof valve 31, so that the rapid diffusion of the high-temperature thermal medium is hindered.

[0025] The explosion-proof valve 31 includes a non-closed tapered section 312 and a residual section 311 located in a non-closed area of ​​the tapered section 312. The tapered section 312 and the residual section 311 together form a continuous closed ring pattern. The continuous closed ring pattern can be, for example, a racetrack shape, an elliptical shape, a rectangular shape, etc.

[0026] In one embodiment, the explosion-proof valve 31 includes a plurality of discontinuous tapered sections 312, and a residual section 311 is disposed between adjacent tapered sections 312; wherein the plurality of tapered sections 312 and the plurality of residual sections 311 together form a continuous closed ring pattern. For example, the formation paths of the plurality of tapered sections 312 correspond to the racetrack shape when the continuous closed ring pattern is racetrack-shaped.

[0027] In another embodiment, the explosion-proof valve 31 includes a continuous tapered section 312, two ends of the tapered section 312 defining a first endpoint and a second endpoint; and a region between the first endpoint and the second endpoint of the tapered section 312 defines a residual section 311. The tapered section 312 and the residual section 311 together form a continuous closed ring pattern. For example, if the continuous closed ring pattern is racetrack-shaped, the formation paths of the tapered section 312 correspond to the racetrack shape. However, the formation path of the residual section 311 is a straight line.

[0028] Since the tapered portion 312 is formed by a local narrowing of the first surface of the housing 35, it is necessary to ensure that the tapered portion 312 and the remaining portion 311 together form a continuous closed ring pattern so that the two can be better combined to form a continuous closed ring pattern.

[0029] It should be noted that the dimension a of the residual portion 311 denotes a distance between the first endpoint and the second endpoint. As in Fig. 13, the residual portion 311 is linear, and a length of the residual portion 311 along the second direction is the dimension a of the residual portion 311.

[0030] By restricting a ratio range of the width b of the slit portion 11 to the dimension a of the residual portion 311, when the ratio is excessively large, it indicates an excessive width of the slit portion 11 and an excessive shortness of the residual portion 311, so that an explosion-proof element is prone to violent repulsion; and when the ratio is excessively low, it indicates an excessive narrowness of the slit portion 11 and an excessive length of the residual portion 311, which hinders diffusion of a high-temperature thermal medium.

[0031] The wiring harness board 1 may extend in the first direction or may extend in the second direction, wherein both the first direction and the second direction may be directions illustrated in the accompanying drawings. In this embodiment, a longitudinal direction of the slot portion 11 is parallel to a longitudinal direction of the wiring harness board 1.

[0032] As a modification, the longitudinal direction of the slot portion 11 may also be perpendicular to the longitudinal direction of the wiring harness board 1. For example, if the longitudinal direction of the wiring harness board 1 is parallel to the first direction, the longitudinal direction of the slot portion 11 is parallel to the second direction. If the battery assembly includes a plurality of battery cells 3, a plurality of slot portions 11 may be provided so that each slot portion 11 corresponds to an explosion-proof valve of a battery cell 3. The plurality of slot portions 11 are all parallel to the second direction, and the plurality of slot portions 11 are arranged in parallel and at intervals.

[0033] In this embodiment, a value range of a length of the tapered section 312 may be 20 mm to 120 mm. For example, the length of the tapered section 312 may 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 may be within an interval range formed by any two of the above values. It should be noted that the length of the tapered section 312 specifically refers to a distance between the first endpoint and the second endpoint of the tapered section 312 along a formation length of the tapered section 312.

[0034] In this embodiment, a value range of the dimension a of the residual portion 311 may be 5 mm to 50 mm, for example, it may be 5 mm or 15 mm or 20 mm or 30 mm or 35 mm or 45 mm or 50 mm, or it may be in an interval range formed by any two of the above values.

[0035] In this embodiment, a value range of the width b of the slot portion 11 may be 0.5 mm to 60 mm, for example, it may 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 may be in an interval range formed by any two of the above values.

[0036] In this embodiment, a value range of b / a is 0.01 ≤ b / a ≤ 12, for example, a specific value of b / a may 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 may be in an interval range formed by any two of the above values.

[0037] To demonstrate the valve-opening performance of the explosion-proof valve 31, the valve-opening performance will be demonstrated below using several groups of examples and comparative examples. In the embodiments of the present application, the valve-opening performance 31 must meet the following conditions to pass the test: 1. The valve opening time Δt (in seconds) must be within 60 s; 2. The probability of valve opening under a predetermined valve-opening pressure (in percent) must be greater than 55%; 3. The probability of a complete explosion-proof element being forcibly ejected (in percent) must be less than 30%.This application does not specifically limit the specific testing method for the valve-opening performance of the explosion-proof valve 31, and those skilled in the art can determine the valve-opening performance of the explosion-proof valve 31 using conventional technical means. For example, the valve-opening performance of the explosion-proof valve 31 can be determined using the following method: 100 battery cells 3 are selected. The selected battery cells 3 need not be equipped with battery cores and only comprise housings 35 (where the housing 35 has a cover plate 33, and the cover plate 33 has an explosion-proof valve 31). The housings 35 are pumped with air under a fixed clamping force of 5000 N, and the internal air pressure of the housing 35 is monitored. Once the internal air pressure reaches a predetermined value (for example, a predetermined valve opening pressure of the explosion-proof valve 31 minus 0.01 MPa), the pressure is maintained, and it is observed whether the valve opens under this pressure. The following data is recorded: ① Time from reaching the specified pressure until the explosion-proof valve 31 actually opens, defined as valve opening time Δt; ② The probability that the explosion-proof valve 31 opens under the predetermined pressure is determined by dividing the actual number of valves opening by 100 and using the result as the valve opening probability; 3. Observe whether the explosion-proof element is completely ejected by force, and determine the probability that the explosion-proof element is completely ejected by force. The probability that the explosion-proof element is completely ejected by force is calculated by dividing the number of batteries in which the explosion-proof element is completely ejected by force by 100.

[0038] The present application is further described below by means of actual tests with specific examples in conjunction with the specific examples listed in Table 1: Table 1. Width of the slot section Dimension of the remaining section b / a Valve opening time Δt (s) Probability of valve opening below the specified valve opening pressure (%) Probability that the explosion-proof element will be completely ejected by force (%) Embodiment 1 9,5 38 0,25 20 84 0 Embodiment 2 48 5 9,6 12 97 7 Embodiment 3 11 35 0,31 18 89 0 Embodiment 4 45 10 4,5 16 95 4 Embodiment 5 35 7 5 13 96 5 Embodiment 6 10 20 0,5 18 91 3 Embodiment 7 7 25 0,28 27 81 2 Embodiment 8 55 30 1,83 25 83 1 Embodiment 9 10 4 2,5 15 95 12 Embodiment 10 35 45 0,78 33 75 0 Embodiment 11 10 41 0.24 38 69 0 Embodiment 12 50 4,5 11 13 95 18 Embodiment 13 1,7 45 0,04 49 60 0 Embodiment 14 47 4 11,75 10 97 21 Embodiment 15 0,4 35 0,01 60 55 0 Embodiment 16 45 4 11,25 11 97 21 Comparison example 1 0,4 50 0,008 78 42 0 Comparison example 2 58 4,5 12,89 11 96 35

[0039] In embodiments 1 to 6, the values ​​of the width b of the slotted portion 11 all lie within a preferred value range, which means that for a preferred value range of the width b of the slotted portion 11, the following applies: 10 mm ≤ b ≤ 50 mm; the values ​​of the dimension a of the remaining portion 311 all lie within a preferred value range, which means that for a preferred value range of the dimension a of the remaining portion 311, the following applies: 5 mm ≤ a ≤ 40 mm; meanwhile, the values ​​for b / a also lie within a preferred value range, which means that for a preferred value range for b / a, the following applies: 0.25 ≤ b / a ≤ 10.Based on tests, the valve opening performance of the explosion-proof valve 31 can be stated as follows: 1. The valve opening time Δt (in seconds) is within 20 s; 2. The probability of valve opening under a specified valve opening pressure (in percent) is higher than 84%; 3. The probability of a complete explosion-proof element being forcibly ejected (in percent) is less than 10%. The valve opening performance of the explosion-proof valve 31 is excellent.

[0040] In embodiments 7 to 10, compared to embodiments 1 to 6, the values ​​for b / a are within a preferred value range, meaning that the following applies to a preferred value range for b / a: 0.25 ≤ b / a ≤ 10. Although the values ​​of the width b of the slot portion 11 and the values ​​of the dimension a of the remaining portion 311 are within the upper and lower limit ranges, not all of them are within the preferred value ranges. Based on tests, the following statement can be made regarding the valve opening performance of the explosion-proof valve 31: 1. the valve opening time Δt (in seconds) is within 35 s; 2. the probability of valve opening under a predetermined valve opening pressure (in percent) is higher than 70%; 3. the probability of a complete explosion-proof element being forcibly ejected (in percent) is less than 15%. The valve opening performance of explosion-proof valve 31 is good.

[0041] In embodiments 11 to 12, the values ​​of the width b of the slot portion 11 are all within a preferred value range compared to embodiments 1 to 6, which means that for a preferred value range of the width b of the slot portion 11, the following applies: 10 mm ≤ b ≤ 50 mm; the values ​​of the dimension a of the remaining portion 311 are all within a preferred value range, which means for a preferred value range of the dimension a of the remaining portion 311, the following applies: 5 mm ≤ a ≤ 40 mm; although the values ​​for b / a are within upper and lower limit ranges, not all values ​​are within preferred value ranges.Based on tests, the following statement can be made regarding the valve opening performance of the explosion-proof valve 31: 1. The valve opening time Δt (in seconds) is within 40 s; 2. The probability of valve opening under a specified valve opening pressure (in percent) is higher than 65%; 3. The probability of a complete explosion-proof element being forcibly ejected (in percent) is less than 20%. The valve opening performance of the explosion-proof valve 31 is good.

[0042] In Embodiments 13 to 14, the values ​​of the width b of the slit portion 11 and the values ​​of the dimension a of the remaining portion 311 are within the upper and lower limits compared to Embodiments 1 to 6, but not all of them are within the preferable ranges. At the same time, the values ​​of b / a are within the upper and lower limits, but not all of them are within the preferable ranges. Based on tests, the valve opening performance of the explosion-proof valve 31 can be determined as follows: 1. the valve opening time Δt (in seconds) is within 50 s; 2. the probability of valve opening under a predetermined valve opening pressure (in percent) is higher than 60%; 3. the probability of a complete explosion-proof element being forcibly ejected (in percent) is less than 25%. The valve opening performance of the explosion-proof valve 31 is acceptable.

[0043] In Embodiments 15 to 16, compared to Embodiments 1 to 6, there are cases where the upper and lower limit values ​​for the width b of the slit portion 11 and the dimension a of the remaining portion 311 are exceeded, while the values ​​of b / a are within the upper and lower limit values, but not all of them are within the preferred value ranges. Based on tests, the valve opening performance of the explosion-proof valve 31 can be determined as follows: 1. the valve opening time Δt (in seconds) is within 60 s; 2. the probability of valve opening under a predetermined valve opening pressure (in percent) is higher than 55%; 3. the probability of a complete explosion-proof element being completely ejected (in percent) is less than 30%. Thus, only the minimum conditions for the valve opening performance of the explosion-proof valve 31 are met, and the test is suitable.

[0044] However, in Comparative Examples 1 and 2, there are cases where the upper and lower limits are exceeded for the width b of the slot section 11 and the dimension a of the remaining section 311, and there are cases where the upper and lower limits are exceeded for the values ​​of b / a. Based on tests, the following statement can be made for the valve opening performance of the explosion-proof valve 31: 1. the valve opening time Δt (in seconds) is above 60 s; 2. the probability of valve opening under a specified valve opening pressure (in percent) is less than 55%; 3. the probability of a complete explosion-proof element being forcibly ejected (in percent) is higher than 30%. Therefore, the minimum requirements for the valve opening performance of the explosion-proof valve 31 are not met, and the test is not suitable.

[0045] In some embodiments, a preferred range of the width b of the slot portion 11 in the width direction of the slot portion 11 is: 10 mm ≤ b ≤ 50 mm; a preferred range of the dimension a of the remaining portion 311 is: 5 mm ≤ a ≤ 40 mm;

[0046] Furthermore, a preferred range for b / a is: 0.25 ≤ b / a ≤ 10.

[0047] In some embodiments, as in Fig. As can be seen in Figure 13, a projection of the slot portion 11 on a plane on which the first surface is located at least partially covers the remaining portion 311; in the width direction of the slot portion 11, a preferred range for the width b of the slot portion 11 is: 10 mm ≤ b ≤ 50 mm; a preferred range for b / a is: 0.25 ≤ b / a ≤ 10.

[0048] If a projection of the slot portion 11 on the battery cell 3 at least partially overlaps the remaining portion 311, no high-temperature thermal medium will explosively discharge directly toward the slot portion 11 at this location, since no valve opens in the area corresponding to the remaining portion 311, so that the expansion rate of the gap is slowed at this location. To ensure smooth diffusion of the high-temperature thermal medium, the width of the slot portion 11 should be correspondingly larger, and the dimension of the remaining portion 311 should be correspondingly smaller to facilitate rapid explosive discharge of the high-temperature thermal medium.

[0049] In this embodiment, a value of the width b of the slit portion 11 may be 10 mm or 15 mm or 20 mm or 30 mm or 35 mm or 45 mm or 50 mm, or may be in an interval range formed by any two of the above values.

[0050] In some other embodiments, as in Fig. As can be seen in Figure 14, a projection of the slot portion 11 on the first surface completely covers the remaining portion 311; in the width direction of the slot portion 11, the width b of the slot portion 11 is: 2 mm ≤ b ≤ 10 mm; and 0.2 ≤ b / a ≤ 2.

[0051] Since the projection of the slit portion 11 on the battery cell 3 completely covers the remaining portion 311, meaning that when the slit portion 11 and the remaining portion 311 are completely opposite each other, no high-temperature thermal medium will explosively discharge directly toward the slit portion 11 at this location, since no valve opens in a region corresponding to the remaining portion 311. Therefore, compared to a situation in which the projection of the slit portion 11 on the battery cell 3 at least partially overlaps the remaining portion 311, the expansion rate of a gap at this location is further slowed down. Therefore, to ensure smooth diffusion of the high-temperature thermal medium, the width of the slit portion 11 should be correspondingly larger, and the dimension of the remaining portion 311 should be correspondingly smaller.

[0052] In this embodiment, a value of the width b of the slit portion 11 may be 2 mm or 3 mm or 4 mm or 5 mm or 6 mm or 8 mm or 10 mm, or may be in an interval range formed by any two of the above values.

[0053] In some other embodiments, as in Fig. 15 or Fig. 16 or Fig. As can be seen in Figure 17, a projection of the slot portion 11 on the first surface does not include the remaining portion 311; in the width direction of the slot portion 11, the width b of the slot portion 11 is: 0.5 mm ≤ b ≤ 20 mm; and 0.012 ≤ b / a ≤ 4.

[0054] Since the projection of the slit portion 11 on the first surface does not overlap the remaining portion 311, this means that the slit portion 11 does not correspond to the remaining portion 311, but instead corresponds to the tapered portion 312 of the explosion-proof valve 31. At this time, a high-temperature thermal medium explosively discharges directly toward the slit portion 11, which facilitates rapid diffusion of the high-temperature thermal medium. The expansion rate of the gap at this location is comparatively high, so the width of the slit portion 11 can be reduced accordingly. Furthermore, since the slit portion 11 continues to expand after the high-temperature thermal medium explosively discharges, the restraint that the slit portion 11 exerts on the explosion-proof element is weakened.In order to prevent the explosion-proof element from easily penetrating the residual portion 311 and being forcibly ejected after being subjected to a force, the dimension of the residual portion 311 may be appropriately increased, which is conducive to preventing the complete explosion-proof element from being forcibly ejected completely.

[0055] In this embodiment, a value of the width b of the slit portion 11 may 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 may be in an interval range formed by any two of the above values.

[0056] In some embodiments, as in Fig.12, the longitudinal direction of the slit portion 11 is parallel to the longitudinal direction of the wiring harness board 1, the slit portion 11 being arranged at a central position of the wiring harness board 1 in the width direction of the slit portion 11, and the projection of the slit portion 11 on the first surface overlaps a central position of the explosion-proof valve 31.

[0057] Since a plurality of conductive core wires 16 are arranged within the wiring harness board 1, it is provided that generally a plurality of branch circuits of the conductive core wires 16 are provided with comparable positive and negative poles, and no wires are routed at a position of the slot portion 11.

[0058] Along the width direction of the slot portion 11, by disposing the slot portion 11 at the central position of the wire harness board 1, widths of the wire harness board 1 on two sides of the slot portion 11 in the width direction are provided to be comparable, so that a number of branch circuits of the conductive core wires 16 arranged on the two sides of the slot portion 11 along the width direction is comparatively average, which is more convenient for arrangement of wire harnesses.

[0059] At the same time, the projection of the slit portion 11 on the first surface overlaps the central position of the explosion-proof valve 31. Thus, the slit portion 11 and the explosion-proof valve 31 are arranged opposite each other, which ensures smooth gas discharge after the opening of the explosion-proof valve 31 and a better explosive discharge effect. As shown in Fig.As can be seen in Figure 2, the longitudinal direction of the slot portion 11 is parallel to the longitudinal direction of the wiring harness board 1, that is, the wiring harness board 1 also extends in the first direction. At this time, the width direction of the slot portion 11 is parallel to the second direction.

[0060] In other embodiments, as in Fig. 4, the longitudinal direction of the slot portion 11 is parallel to the longitudinal direction of the wiring harness board 1, and in the width direction of the slot portion 11, a vertical distance d between an edge of the slot portion 11 on a side near a center line of the wiring harness board 1 and the center line of the wiring harness board 1 is: 0.5 mm ≤ d ≤ 20 mm.

[0061] When the longitudinal direction of the slot portion 11 is parallel to the longitudinal direction of the wiring harness board 1 and a distance d exists in the width direction of the slot portion 11 between the slot portion 11 and the center line of the wiring harness board 1, this means that the widths of the wiring harness board 1 on two sides of the slot portion 11 in the width direction are unequal, with one side being larger and one side being smaller.

[0062] When the perpendicular distance d between the edge of the slot portion 11 on the side near the center line of the wiring harness board 1 and the center line of the wiring harness board 1 is comparatively large, the number of branch circuits of the conductive core wires 16 arranged on both sides of the slot portion 11 in the width direction is unbalanced because no wires are laid at the position of the slot portion 11. Specifically, more wires are present and more concentrated on the side of the wiring harness board 1 with a larger width, while fewer wires are present on the side with a narrower width, ensuring that the impact of valve opening of the explosion-proof valve on the wires is minimized.

[0063] When the perpendicular distance d between the edge of the slot portion 11 on the side near the centerline of the wiring harness board 1 and the centerline of the wiring harness board 1 is comparatively small, the number of branch circuits of the conductive core wires 16 arranged on both sides of the slot portion 11 in the width direction is more balanced, which is more suitable for wiring harness board layout. This also simplifies the arrangement of the slot portion 11 directly opposite the explosion-proof valve 31, ensuring smooth gas discharge after the explosion-proof valve 31 is opened and achieving more favorable explosive discharge performance.

[0064] In this embodiment, a value of d may 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 may be in an interval range formed by any two of the above values.

[0065] In some embodiments, as in Fig. 13 or Fig. 15, the longitudinal direction of the explosion-proof valve 31 is parallel to the longitudinal direction of the first surface, and a longitudinal direction of the slit portion 11 is perpendicular to a longitudinal direction of the remaining portion 311, where 1 mm ≤ b ≤ 60 mm.

[0066] In this embodiment, a value of the width b of the slit portion 11 may be 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 45 mm or 48 mm or 52 mm or 56 mm or 60 mm, or may be in an interval range formed by any two of the above values.

[0067] In some embodiments, as in Fig.17, the longitudinal direction of the explosion-proof valve 31 is parallel to the thickness direction of the battery cell 3, and a longitudinal direction of the slit portion 11 is parallel to a longitudinal direction of the remaining portion 311, where 0.5 mm ≤ b ≤ 40 mm. In this embodiment, a value of the width b of the slit portion 11 may 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 may be within an interval range formed by any two of the above values.

[0068] To simplify the description, the situation when the longitudinal direction of the explosion-proof valve 31 is parallel to the longitudinal direction of the first surface is described as the explosion-proof valve 31 being arranged horizontally; and when the longitudinal direction of the explosion-proof valve 31 is parallel to the thickness direction of the battery cell 3, the explosion-proof valve 31 is described as the explosion-proof valve 31 being arranged vertically.

[0069] Compared to the vertical arrangement of the explosion-proof valve 31, the horizontal arrangement of the explosion-proof valve 31 results in a lower valve opening pressure. This is because the farther the edge of the explosion-proof valve 31 is from the edge of a cover plate 33, the smaller the tensile force exerted by the cover plate 33 is, so the valve can be opened more easily. When the explosion-proof valve 31 is arranged vertically, the distance between the explosion-proof valve 31 and the long side of the cover plate 33 is too small, and a higher valve opening pressure is required for valve activation. Therefore, when the explosion-proof valve 31 is arranged horizontally, the width b of the slot portion 11 should be provided wider, and in this case, b should be within a more preferable range.In contrast, when the explosion-proof valve 31 is arranged vertically, the width b of the slot portion 11 must be set narrower.

[0070] In some embodiments, as in Fig. 19, a plurality of battery cells 3 are stacked to form a battery row 2, wherein the longitudinal direction of the residual portion 311 is parallel to the width direction of the first surface; residual portions 311 of explosion-proof valves 31 of two adjacent battery cells 3 are arranged facing away from each other in the longitudinal direction of the first surface; The longitudinal direction of the slit portion 11 is parallel to the width direction of the first surface. In the width direction of the slit portion 11, the width b of the slit portion 11 is 0.5 mm ≤ b ≤ 50 mm. In the longitudinal direction of the first surface, the residual portions 311 of the explosion-proof valves 31 of two adjacent battery cells 3 are arranged facing away from each other, and the longitudinal direction of the slit portion 11 is parallel to the width direction of the first surface. When the explosion-proof valves 31 of two adjacent battery cells 3 open simultaneously, explosion-proof elements urge the wire harness board 1 upward on two sides of the slit portion 11, respectively, so that an expansion speed of the slit portion 11 smoothly accelerates and an expansion speed of a gap of the slit portion 11 is accelerated.At this time, the width of the slit portion 11 may be set smaller to avoid heat accumulation within a short time during valve opening due to heating of the wiring harness board 1 and to cause the width of the slit portion 11 to become larger so as not to affect the explosive discharge of a high-temperature thermal medium.

[0071] In this embodiment, a value of the width b of the slit portion 11 may 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 45 mm or 48 mm or 50 mm, or may be in an interval range formed by any two of the above values.

[0072] In this embodiment, in a direction perpendicular to the plane on which the wiring harness board 1 is located, the following applies to a thickness f of the wiring harness board 1: 140 micrometers ≤ f ≤ 185 micrometers.

[0073] Since the remaining portion 311 of the explosion-proof valves 31 of two adjacent battery cells 3 are arranged facing away from each other, the area of ​​the slot portion 11 between the two explosion-proof valves 31 is subjected to greater heat concentration, resulting in faster heat buildup and faster expansion of the slot portion 11. Therefore, a larger thickness can be set for the wire harness board 1.

[0074] In other embodiments, as in Fig. 20 and Fig.21, a plurality of battery cells 3 are stacked to form a battery row 2, wherein, based on a current arrangement position of the battery cell 3, remaining portions 311 of explosion-proof valves 31 of two adjacent battery cells 3 on the first surface have the same arrangement position; a longitudinal direction of the slot portion 11 is parallel to a width direction of the first surface, in the width direction of the slot portion 11, the width b of the slot portion 11 is: 1 mm ≤ b ≤ 60 mm.

[0075] It should be noted that for each individual battery cell 3, the arrangement position of its residual portion on the first surface is the same. However, according to different rows and requirements for parallel connection of a battery row, the arrangement direction of the battery cell 3 differs when it is arranged, that is, the orientation of a pole of the battery cell 3 is different. In this embodiment, based on the current arrangement position of the battery cell 3, the residual portions 311 of the explosion-proof valves 31 of two adjacent battery cells 3 have the same arrangement position on the first surface.

[0076] Since the residual portions 311 of the explosion-proof valves 31 of two adjacent battery cells 3 have the same arrangement position on the first surface, when the explosion-proof valves 31 of two adjacent battery cells 3 open simultaneously, one explosion-proof element will direct the direction of explosive discharge of a high-temperature thermal medium because the residual portion 311 remains connected. The valve opening directions of the explosion-proof valves 31 of two adjacent battery cells 3 are consistent, no explosive discharge occurs between the two adjacent battery cells 3, heat is not concentrated, and the possibility of the slit portion 11 being heated and expanding is reduced.To avoid an impact on the explosive discharge of the high-temperature thermal medium, the width of the slit portion 11 can be set larger at this time to ensure prompt explosive discharge of the high-temperature thermal medium. Meanwhile, since the valve opening directions of the explosion-proof valves 31 of two adjacent battery cells 3 are consistent, heat will not accumulate due to mutual spraying of the high-temperature thermal medium, and forcible repulsion of the explosion-proof element is less likely, so the dimension of the residual portion 311 can be set smaller.

[0077] In this embodiment, a value of the width b of the slit portion 11 may be 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 45 mm or 48 mm or 52 mm or 56 mm or 60 mm, or may be in an interval range formed by any two of the above values.

[0078] In this embodiment, in a direction perpendicular to a plane on which the wiring harness board 1 is located, the following applies to a thickness f of the wiring harness board 1: 155 micrometers ≤ f ≤ 235 micrometers.

[0079] Since the valve opening directions of the explosion-proof valves 31 of two adjacent battery cells 3 are consistent, heat accumulation during explosive discharge of a high-temperature thermal medium is between a state where valve opening directions are opposite and a state where valve opening directions are relative, so the thickness of the wire harness board 1 must be selected to be moderate.

[0080] In some other embodiments, as in Fig.18, a plurality of battery cells 3 are stacked to form a battery string 2. The longitudinal direction of the residual portion 311 is parallel to the longitudinal direction of the first surface. In the width direction of the first surface, the residual portion 311 of the explosion-proof valve 31 of a battery cell 3 is arranged near the residual portion 311 of the explosion-proof valve 31 of a battery cell 3 on one side and is arranged away from the residual portion 311 of the explosion-proof valve 31 of a battery cell 3 on the other side.

[0081] The longitudinal direction of the slot portion 11 is parallel to the width direction of the first surface, and in the width direction of the slot portion 11, the width b of the slot portion 11 is: 1 mm ≤ b ≤ 50 mm.

[0082] Since, in the width direction of the first surface, the residual portion 311 of the explosion-proof valve 31 of a battery cell 3 is located near the residual portion 311 of the explosion-proof valve 31 of the battery cell 3 on one side and is located away from the residual portion 311 of the explosion-proof valve 31 of the battery cell 3 on the other side. This means that the valve opening direction of the explosion-proof valve 31 of a battery cell 3 is opposite to a valve opening direction of the explosion-proof valve 31 of the battery cell 3 on the side when the explosion-proof valve 31 opens, and is oriented from the valve opening direction of the explosion-proof valve 31 of the battery cell 3 on the other side.That is, when the explosion-proof valves 31 of multiple battery cells 3 open simultaneously, the remaining portion 311 remains connected, and the explosion-proof element directs the direction of explosive discharge of the high-temperature thermal medium. As a result, the battery cell 3 and the adjacent battery cell 3 on one side enter a state of mutual spraying, while the battery cell 3 and the adjacent battery cell 3 on the other side enter a state of mutual spraying. For the two battery cells 3 that mutually spray each other, the heat is concentrated, and the gap of the slit portion 11 expands more rapidly.At this time, in order to prevent momentary heat buildup during valve opening due to heating of the wiring harness board 1, the width of the slit portion 11 may be set smaller, and the explosive discharge of the high-temperature thermal medium will not be affected. In contrast, for the two battery cells 3 that are in a state where spraying occurs facing away from each other, the heat is not concentrated, and the heating and expansion of the slit portion 11 is less likely. To avoid influencing the explosive discharge of the high-temperature thermal medium in this case, the width of the slit portion 11 may be set larger. To consider both cases, the width b of the slit portion 11 can reasonably be set by selecting an intermediate value.

[0083] In this embodiment, a value of the width b of the slit portion 11 may be 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 45 mm, or 48 mm, or 50 mm, or may be within an interval range formed by any two of the above values. In this embodiment, in a direction perpendicular to the plane on which the wire harness board 1 is located, a thickness f of the wire harness board 1 is: 185 micrometers ≤ f ≤ 335 micrometers. Since the thickness f of the wire harness board 1 needs to consider two conditions, the value of f should also be moderate.

[0084] In some embodiments, the battery assembly comprises, as shown in the Fig.5 to 8, a cover plate 33, and the explosion-proof valve 31 is arranged on the cover plate 33 and is located on a surface of the cover plate 33 facing the wire harness board 1 or on a surface facing away from the wire harness board 1;

[0085] The cover plate 33 is further provided with a support portion 32 surrounding an outer peripheral side of the explosion-proof valve 31, and the support portion 32 extends toward the wire harness board 1 and is configured to support the wire harness board 1.

[0086] A surface of the cover plate 33 facing the wiring harness board 1 or a surface facing away from the wiring harness board 1 has a recess to form a mounting groove for the explosion-proof valve. By arranging the explosion-proof valve 31 in the mounting groove for the explosion-proof valve, mounting and fixing of the explosion-proof valve 31 can be achieved, and in particular, the explosion-proof valve 31 is permanently connected to the cover plate 33 by welding.

[0087] A region of the cover plate 33 corresponding to the explosion-proof valve 31 is penetrated to form a mounting opening for the explosion-proof valve, so that when the explosion-proof valve 31 opens along a section of the tapered section 312, the mounting opening for the explosion-proof valve can create space for an opening section of the explosion-proof valve 31. In a direction perpendicular to the plane of the cover plate 33, the section of the tapered section 312 lies in the region of the mounting opening for the explosion-proof valve. The mounting groove for the explosion-proof valve is arranged to surround a peripheral edge of the mounting opening for the explosion-proof valve.

[0088] The cover plate 33 is further provided with the support portion 32 surrounding the outer peripheral side of the explosion-proof valve 31. The support portion 32 extends toward the wire harness board 1 and is configured to support the wire harness board 1. After the support portion 32 supports the wire harness board 1, a gap remains between the wire harness board 1 and the explosion-proof valve 31, preventing the wire harness board 1 from directly abutting against an explosion-proof element and affecting its opening.

[0089] In this embodiment, the explosion-proof valve 31 is arranged on the surface of the cover plate 33 facing away from the wiring harness board 1, and the support portion 32 is supported between the wiring harness board 1 and the explosion-proof valve 31 to form a clearance portion 6 between the wiring harness board 1 and the explosion-proof valve 31.

[0090] That is, the surface of the cover plate 33 facing away from the wire harness board 1 has a recess to form an explosion-proof valve mounting groove, which facilitates the arrangement of the explosion-proof valve 31 in the explosion-proof valve mounting groove, so that the explosion-proof valve 31 and the support portion 32 are respectively positioned on both sides of the cover plate 33 to provide a larger clearance between the wire harness board 1 and the explosion-proof valve 31 and thus prevent the wire harness board 1 from directly abutting against an explosion-proof element and affecting its opening.

[0091] In one embodiment of a specific structure of the support portion 32, the support portion 32 is arranged on both sides of a longitudinal direction of the explosion-proof valve 31 and extends in a width direction of the explosion-proof valve 31; and / or the support portion 32 is arranged on both sides of a width direction of the explosion-proof valve 31 and extends in a longitudinal direction of the explosion-proof valve 31.

[0092] By setting the support portion 32 in a strip shape, it exerts a support role to form a clearance portion between the wire harness board 1 and the explosion-proof valve 31, which prevents the wire harness board 1 from directly abutting against an explosion-proof member and affecting its opening, and ensures smooth opening of the explosion-proof valve 31.

[0093] As another embodiment of the support portion 32, the support portion 32 is configured to completely surround the explosion-proof valve 31 so that the support portion 32, the wiring harness board 1, and the explosion-proof valve 31 together form a cavity.

[0094] By disposing the support portion 32 to completely surround the explosion-proof valve 31, not only is it possible to prevent the wiring harness board 1 from directly abutting against the explosion-proof element and interfering with its opening, thus ensuring smooth opening of the explosion-proof valve 31, but it also allows the support portion 32 to surround the peripheral edge of the explosion-proof valve mounting hole, thus providing structural reinforcement for the explosion-proof valve mounting hole. This helps prevent the explosion-proof valve 31 from being twisted and deformed due to high welding heat when the explosion-proof valve 31 is welded to the cover plate 33, ensuring that a valve opening pressure of the explosion-proof valve 31 remains precise and controllable.Furthermore, forming a cavity between the support portion 32, the wiring harness board 1, and the explosion-proof valve 31 enables convenient testing of the airtightness of the explosion-proof valve 31, and a gas storage space for accommodating the explosively discharging gas after an explosive discharge of the explosion-proof valve 31 is provided.

[0095] Furthermore, in this embodiment, the support portion 32 is racetrack-shaped to adapt to the structural shape of a mounting hole for the explosion-proof valve. When implemented in a racetrack shape, the support portion 32 provides a large support area and is free of sharp corners around its entire circumference. When the slotted portion is located at a central position of the racetrack shape, the support portion 32 can provide uniform support for the wiring harness board 1.

[0096] In a modification, the support section 32 may also be elliptical or rectangular, etc.

[0097] In some embodiments, a material of the support portion 32 is plastic or metal.

[0098] In some embodiments, the support portion 32 and the cover plate 33 are provided separately.

[0099] The separate provision of support section 32 and cover plate 33 enables convenient disassembly of the support section 32 so that it can be removed when the support section 32 is not required.

[0100] In some other embodiments, the support portion 32 and the cover plate 33 are formed in one piece.

[0101] The integral formation of the support portion 32 and the cover plate 33 enables convenient manufacturing and assembly of the components, improved support performance can be achieved, and displacement of the support portion 32 due to external influences during support is prevented. In addition, the integral formation of the support portion 32 and the cover plate 33 can increase the strength of the cover plate 33 in a region of an explosion-proof valve, making it less susceptible to deformation, and ensuring that the valve opening pressure of the explosion-proof valve 31 is precise and controllable.

[0102] In some embodiments, as in Fig.6, in a direction perpendicular to a plane on which the cover plate 33 is located, a height h at which the support portion 32 protrudes from a surface of the cover plate 33 on a side facing the wiring harness board 1 is as follows: 0.005 ≤ h / b ≤ 2.

[0103] The support portion 32 is supported between the wiring harness board 1 and the explosion-proof valve 31 to form a clearance portion between the wiring harness board 1 and the explosion-proof valve 31.

[0104] In the direction perpendicular to the plane on which the cover plate 33 is located, the higher the support portion 32 protrudes above the surface of the cover plate 33 on the side facing the wire harness board 1, the larger the gas discharge space of the clearance portion, and a corresponding slot portion 11 can be set smaller. At the same time, the height at which the support portion 32 protrudes above the surface 33 on the side facing the wire harness board 1 should not be too large. If the support portion 32 is too high, possibly even exceeding the height of a top surface of a pole, connecting a detection branch circuit 12 to the pole will be inconvenient. The detection branch circuit 12 must also be bent downward and will take up too much space in the Z direction after assembly.Conversely, if the support portion 32 is too short, it results in a smaller gas discharge space of the clearance portion, which hinders the explosive discharge of a high-temperature thermal medium, and a clearance between the wiring harness board 1 and the explosion-proof valve 31 is too small, which easily affects the opening of an explosion-proof element.

[0105] In some other embodiments, a preferred range for h / b may be chosen as 0.01 ≤ h / b ≤ 2.

[0106] In some embodiments, as in Fig.6, a distance between a surface of the support portion 32 on the side near the explosion-proof valve 31 and a surface on the side remote from the explosion-proof valve 31 on a plane parallel to the plane on which the cover plate 33 is located is defined as the thickness j of the support portion 32, for which 0.008 ≤ j / b ≤ 3 applies.

[0107] A distance between the surface of the support portion 32 on the side near the explosion-proof valve 31 and the surface on the side remote from the explosion-proof valve 31 on a plane parallel to the plane on which the cover plate 33 is located is defined as the thickness of the support portion 32.The wider the thickness, the larger the area of ​​the support portion 32 supporting the wiring harness board 1, the more stable the wiring harness board 1 is. The support portion 32 surrounds a peripheral edge of an explosion-proof valve mounting hole, the greater the structural reinforcement effect of the explosion-proof valve mounting hole, the higher the strength of the cover plate near the explosion-proof valve 31, the more stable the valve opening pressure, and a higher valve opening threshold can be set. Accordingly, the slot portion 11 can be set smaller, and accordingly, the width of the wiring harness board 1 for routing wires is also larger. In addition, due to the limited space of the cover plate 33, the support portion 32 should not be too wide to avoid taking up too much installation space required for other structural components.At the same time, the slot section 11 must not be too small to prevent an explosive discharge of a thermal medium at high temperature from being hindered.

[0108] In some embodiments, a protective overlay 5 is disposed between the slotted portion 11 and the explosion-proof valve 31. The protective overlay 5 is configured to prevent contaminants from falling onto the explosion-proof valve 31. A projection of the slotted portion 11 on the first surface overlaps the protective overlay 5.

[0109] By disposing the protective pad 5 between the slot portion 11 and the explosion-proof valve 31 and overlapping the projected area of ​​the slot portion 11 on the first surface with the protective pad 5, contaminants such as dust can be prevented from penetrating through the slot portion 11 and falling onto the explosion-proof valve 31, and in particular, conductive contaminants can be prevented from falling onto the explosion-proof valve 31, thus preventing corrosion or damage of the explosion-proof valve 31 and improving safety performance.

[0110] In some embodiments, as in Fig. 8, the wiring harness board 1 has a wiring harness board body 10, and a thickness of the wiring harness board body 10 is defined as m, and a thickness of the protective pad 5 is defined as k, where 0.29 ≤ k / m ≤ 2.14.

[0111] By restricting an upper limit on the ratio of the thickness of the protective pad 5 to the thickness of the wiring harness board body 10, the protective pad 5 is prevented from being too thick and the wiring harness board body 10 is too thin, preventing the situation that the protective pad 5 jacks up the wiring harness board body 10 to be unevenly arranged. In addition, if the protective pad 5 is too thick, it occupies a space of the clearance portion provided between the wiring harness board 1 and the explosion-proof valve 31, so that a gas discharge space for explosive discharge is reduced and the explosive discharge of a high-temperature thermal medium is affected.At the same time, by restricting a lower limit for the ratio of the thickness of the protective pad 5 to the thickness of the wire harness board body 10, the protective pad 5 is prevented from being too thin and the wire harness board body 10 is prevented from being too thick, preventing damage to the protective pad 5 or its failure due to insufficient thickness, which would impair its dustproof function.

[0112] In some other embodiments, a preferred range for k / m may be chosen as 0.35 ≤ k / m ≤ 2.

[0113] In some embodiments, as in Fig. As can be seen in Figure 6, the thickness of the protective layer 5 is defined as k, where: 0.0016 ≤ k / b ≤ 0.6.

[0114] By restricting a lower limit for the ratio of the protective pad 5 to a width of the slot portion 11, the protective pad 5 can be prevented from being too thin and the width of the slot portion 11 from being too wide, so that damage to the protective pad 5 or its failure due to insufficient thickness can be prevented, which would impair its dustproof function.Meanwhile, by restricting an upper limit to the ratio of the thickness of the protective pad 5 to the width of the slit portion 11, the protective pad 5 can be prevented from being too thick and the width of the slit portion 11 from being too narrow, so as to prevent a situation that when the protective pad 5 is too thick, it occupies a space of a clearance portion provided between the wire harness board 1 and the explosion-proof valve 31, which reduces a gas discharge space for the explosive discharge and affects the explosive discharge of a high-temperature thermal medium.

[0115] In some embodiments, the protective pad 5 is fixed to a side of the support section 32 facing the wiring harness board 1.

[0116] By fixing the protective pad 5 to the support portion 32, the protective pad 5 does not occupy a gas discharge space, which ensures that a space of a clearance portion is maintained between the wire harness board 1 and the explosion-proof valve 31 and that an explosive discharge of a high-temperature thermal medium proceeds smoothly.

[0117] The protective pad 5 may be a small strip that merely blocks a gap formed by the slot portion 11, or it may be a complete element that covers the explosion-proof valve 31.

[0118] In some embodiments, a projection of the protective overlay 5 on the first surface covers the tapered portion 312.

[0119] The tapered section 312 of the explosion-proof valve is completely covered by the projected area of ​​the protective pad 5 on the first surface, so that the protective pad 5 protects the entire tapered section 312 of the explosion-proof valve from contaminants. It prevents contaminants such as dust from penetrating the slotted section 11 and falling onto the tapered section 312 of the explosion-proof valve 31. This prevents corrosion or damage to the tapered section 312 and improves safety performance.

[0120] In some embodiments, as in Fig. 6 and Fig.As can be seen in Fig. 7, the cover plate 33 is further provided with a support portion 32 surrounding an outer peripheral side of the explosion-proof valve 31. The support portion 32 is provided with an air guide groove 321, and a direction from a surface of the support portion 32 on a side near the explosion-proof valve 31 to a surface on a side remote from the explosion-proof valve 31 is defined as a thickness direction of the support portion 32; in the thickness direction of the support portion 32, the air guide groove 321 penetrates the support portion 32; parallel to a plane on which the explosion-proof valve 31 is located and perpendicular to the thickness direction of the support portion 32, the maximum width n of the air guide groove 321 is: 0.0016 ≤ n / b ≤ 2. In this embodiment, by fixing the protective pad 5 to the side of the support portion 32 facing the wire harness board 1 and by arranging the support portion 32 such that it completely surrounds the explosion-proof valve 31, a gas storage chamber can be formed which is encompassed by the protective pad 5, the explosion-proof valve 31 and the support portion 32.

[0121] By providing the air guide groove 321 penetrating the support portion 32, the gas storage chamber can communicate with an external environment, which facilitates helium leak detection.

[0122] By limiting the ratio of the maximum width of the air guide groove 321 to the width of the slot portion 11, a high-temperature thermal medium can quickly melt the protective pad if the maximum width of the air guide groove is larger. Meanwhile, the width of the slot portion 11 can be set to be narrower.

[0123] In some other embodiments, a preferred range for n / b may be selected as 0.002 ≤ n / b ≤ 1.8.

[0124] In some embodiments, as in Fig. 6 and Fig. 7, in a direction perpendicular to the plane on which the explosion-proof valve 31 is located, the maximum height o of the air guide groove 321 is as follows: 0.0016 ≤ ob ≤ 1.

[0125] By limiting a ratio of the maximum height of the air guide groove 321 to the width of the slot portion 11, a high-temperature thermal medium can quickly melt the protective pad when the maximum height of the air guide groove 321 is larger, while the width of the slot portion 11 can be set to be narrower.

[0126] In some embodiments, a projection of the slot portion 11 on the first surface overlaps the air guide groove 321, where: 0.01 ≤ n / b ≤ 2.

[0127] When the projection of the slit portion 11 on the first surface overlaps the air guide groove 321, a high-temperature thermal medium can melt a gap of the slit portion 11 more quickly to expand it. Meanwhile, the width of the slit portion 11 can be set to be narrower.

[0128] In some other embodiments, a projection of the slot portion 11 on the first surface does not overlap the air guide groove 321, where: 0.0016 ≤ n / b ≤ 1.9.

[0129] When the projection of the slit portion 11 on the first surface does not overlap the air guide groove 321, the speed at which a high-temperature thermal medium melts a gap of the slit portion 11 is slower, which means that the expansion speed of the slit portion 11 is slower. Meanwhile, the width of the slit portion 11 can be set wider to ensure smooth gas discharge.

[0130] In some embodiments, the air guide groove 321 is a V-shaped groove, wherein an opening cross-sectional area of ​​the support portion 32 gradually decreases from a side of the support portion 32 near the wire harness board 1 toward a side facing away from the wire harness board 1.

[0131] In some embodiments, the protective pad 5 is adhesively bonded to the support section 32. An adhesive connection enables convenient and quick installation.

[0132] In some embodiments, at least a portion of an overlapping area of ​​the protective pad 5 and the support portion 32 is provided with an adhesive layer for adhesion. In a direction perpendicular to a plane on which the protective pad 5 is located, the adhesive layer is locally formed with a recess so that a projection of the adhesive layer does not overlap the air guide groove 321. The adhesive layer is locally formed with a recess so that the projection of the adhesive layer does not overlap the air guide groove 321, thereby preventing the adhesive layer from blocking the air guide groove 321, preventing an impact on helium leak detection and simultaneously preventing unsmooth gas discharge.

[0133] In some embodiments, the width p of the indentation parallel to a plane on which the protective overlay 5 is located and perpendicular to a thickness direction of the support section 32 is as follows: 2 ≤ n / p ≤ 5.

[0134] By limiting the ratio of the maximum width of the air guide groove 321 to the width of a concavity formed locally in an adhesive layer, if the ratio is excessively large, it indicates that the air guide groove 321 is excessively wide and the concavity of the adhesive layer is comparatively small, which may cause the adhesive layer to overflow and block the air guide groove 321; and if the ratio is excessively low, it indicates that the concavity of the adhesive layer is too wide open, which is not conducive to fixation of the protective pad 5.

[0135] It should be noted that in some other embodiments, the protective pad 5 is provided with a notch 51, wherein the notch 51 and the air guide groove 321 are parallel and form independent features, that is, when the support portion 32 is provided with the air guide groove 321, the protective pad 5 is not provided with the notch 51; and when the protective pad 5 is provided with the notch 51, the support portion 32 is not provided with the air guide groove 321.

[0136] In some embodiments, the protective overlay 5 is provided with a notch 51. In a direction perpendicular to a plane on which the protective overlay 5 is located, the notch 51 penetrates the protective overlay 5; For a total length q of the notch 51, the following applies: 0.016 ≤ q / b ≤ 10.

[0137] By providing the notch 51 on the protective pad 5 and penetrating the notch 51 through the protective pad in a thickness direction of the protective pad 5. The notch 51 is in a closed state under normal conditions, that is, a gas storage chamber encompassed by the protective pad 5, the explosion-proof valve 31, and the support portion 32 constitutes a sealed chamber. And during an airtightness test of a battery, the notch 51 may be in an open state under a predetermined pressure, so that the gas storage chamber is an unsealed chamber. The provision of the notch 51 can effectively protect the explosion-proof valve 31 under normal use conditions, and the notch can also be used for an airtightness test of the battery, thus improving the performance of the battery.

[0138] The total length of the notch 51 refers to a length over which the notch 51 extends on the plane on which the protective overlay 5 is located. In the case of multiple notches 51 or offset notches 51, the total length of the notch 51 refers to a sum of the lengths of the multiple notches.

[0139] When the ratio of the total length of the notches 51 to the width of the slit portion 11 is larger, the total length of the notches 51 is longer, so that the breakthrough of the high-temperature thermal medium through the protective pad 5 is facilitated, which facilitates the diffusion of the high-temperature thermal medium. In this case, the width of the slit portion 11 can be set to a smaller value. Accordingly, when the ratio of the total length of the notches 51 to the width of the slit portion 11 is smaller, the total length of the notches 51 is shorter, which makes it difficult for the high-temperature thermal medium to break through the protective pad 5, which may hinder the diffusion of the high-temperature thermal medium. Meanwhile, the width of the slit portion 11 can be set to be larger.However, the total length of the notch 51 should not be excessively long to avoid reducing the strength of the protective pad 5 and quickly damaging the protective pad 5.

[0140] In this embodiment, a value range of the total length q of the notch 51 is: 3 mm ≤ q ≤ 10 mm. A value of the total length q of the notch 51 can be 3 mm or 4 mm or 5 mm or 6 mm or 8 mm or 9 mm or 10 mm, etc.

[0141] In some other embodiments, a preferred range for q / b may be selected as 0.02 ≤ q / b ≤ 9.

[0142] In some embodiments, a thickness of the protective overlay 5 is defined as k, where: 10 ≤ q / k ≤ 100 and 0.1 mm ≤ k ≤ 0.3 mm.

[0143] If the thickness of the protective pad 5 is too large, it will make it difficult to open the notch 51 during an airtightness test, which will affect the detection precision; if the thickness of the protective pad 5 is too small, it may cause the protective pad 5 to be in an open state under normal conditions, allowing foreign substances such as electrolyte, water, metal chips, and dust to easily penetrate into the interior of the protective pad 5, resulting in safety risks of the battery.At the same time, if the ratio of the total length of the notch 51 to the thickness of the protective pad 5 is too low, it makes it difficult to open the notch 51 under a given pressure; if the ratio of the total length of the notch 51 to the thickness of the protective pad 5 is too large, it results in the notch 51 being comparatively long, or if the thickness of the protective pad 5 is comparatively thin, it results in the protective pad 5 on both sides of the notch 51 being unable to support each other. The notch 51 is opened smoothly under normal conditions, and a structural strength is also comparatively low.

[0144] In this embodiment, a value of the thickness k of the protective layer 5 may be 0.1 mm or 0.15 mm or 0.2 mm or 0.25 mm or 0.3 mm etc.

[0145] In some embodiments, in a direction perpendicular to a plane on which the protective support 5 is located, a zone s is defined as the area encompassed by the peripheral edge of the protective support 5; in a direction perpendicular to a plane on which a cover plate 33 is located, a zone t is defined as the area encompassed by a peripheral edge of the cover plate 33, where: 300 mm 2 ≤ s ≤ 1500 mm 2 and 0.015 ≤ s / t ≤ 0.75.

[0146] By limiting the zone s of the area encompassed by the peripheral edge of the protective pad 5, the protective pad 5 can have a sufficient protection zone, and the zone of the protective pad 5 is not too large, which improves the utilization performance of the protective pad 5.

[0147] By limiting an upper limit for s / t, material waste due to an excessively large zone for the protective pad 5 can be avoided; by limiting a lower limit for s / t, it can be ensured that the protective pad 5 has a sufficient coverage zone for the explosion-proof valve 31, so that the protective pad 5 can achieve reliable protection for the explosion-proof valve 31.

[0148] In this embodiment, a value range of the zone a in the area encompassed by the peripheral edge of the cover plate 33 is: 2000 mm 2 ≤ t ≤ 20000 mm 2 . A value of the zone t in the area encompassed by the peripheral edge of the cover plate 33 may be 2000 mm 2 or 4000 mm 2 or 8000 mm 2 or 12000 mm 2 or 15000 mm 2 or 17000 mm 2 or 18000 mm 2 or 20000 mm 2 etc.

[0149] In some embodiments, as in Fig. 9, the battery assembly comprises a cover plate 33, the cover plate 33 being provided with a liquid injection hole 331, the minimum distance u between the liquid injection hole 331 and the protective pad 5 being: 5 mm ≤ u ≤ 54 mm.

[0150] By limiting a lower limit for the minimum distance u between the liquid injection hole 331 and the protective pad 5, an electrolyte can be injected through the liquid injection hole 331, and the electrolyte can be prevented from flowing to a position where the protective pad 5 is located during the liquid injection process, ensuring the service life of the protective pad 5 and the explosion-proof valve 31. By limiting an upper limit for the minimum distance u between the liquid injection hole 331 and the protective pad 5, an excessively large size of the cover plate 33 is prevented and material waste is avoided.

[0151] In some embodiments, as in Fig.11, at least a part of the notch 51 is not aligned along a single straight line, so that the protective pad 5 forms at least one projection portion 52; the projection portion 52 comprises a first end point 501 and a second end point 502, at least a part of the notch 51 extends continuously from the first end point 501 to the second end point 502; a zone v of the projection portion 52 is defined by the zone encompassed by a connecting line between the first end point 501 and the second end point 502 and the notch 51 between the first end point 501 and the second end point 502, where: 1.1 mm 2 ≤ v ≤ 12.5 mm 2 .

[0152] The protective overlay 5 is formed with at least one projection portion 52 by scribing a notch 51. The zone of the projection portion 52 can be considered as the zone encompassed by a notch segment forming each projection portion 52 and a straight line connecting two endpoints of the notch segment. For example, a projection portion 52 can comprise two intersecting notch segments that together form a triangular projection portion, in which case the zone of the projection portion 52 is a triangular zone. Alternatively, a projection portion 52 can have the shape of a semicircle forming a semicircular projection portion, in which case its zone is the semicircle zone. For example, in a structure in Fig.11, the notch 51 is a curved line, and the zone of the projection portion 52 is a zone v shown in the figure. As another example, in the structure in Fig. 10, the notch 51 forms a cross line, and four projection portions 52 are formed around the cross line. If multiple projection portions 52 are present, the zone of each projection portion 52 is designated as v.

[0153] By restricting an upper limit for the zone of the projection portion 52, it is possible to ensure that the notch 51 is in a closed state under normal conditions, that is, it is possible to ensure that the notch 51 can reliably seal a gas storage chamber included by the protective pad 5, the explosion-proof valve 31, and a support portion 32 under normal conditions, which can prevent sagging of the protective pad 5 and intrusion of foreign matter into the interior of the explosion-proof valve 31, and improve the safety performance of a battery.

[0154] Meanwhile, restricting the lower limit of the area of ​​the protrusion portion 52 ensures that the notch 51 can be opened smoothly during an airtightness test. This means that under a predetermined pressure, the protrusion portion 52 formed by the notch 51 can be opened to perform the airtightness test of the battery, improving the test efficiency and precision of the airtightness test. At the same time, the protective pad 5 does not deform excessively during opening, which does not affect the normal long-term use of the protective pad 5, thus improving the service life of the protective pad 5.

[0155] In some embodiments, as in Fig.15, a projection of the slot portion 11 on the protective pad 5 at least partially covers the notch 51. This ensures that a high-temperature thermal medium can be discharged smoothly, and gas discharge occurs more quickly.

[0156] In some other embodiments, a projection of the slot portion 11 on the protective overlay 5 does not overlap the notch 51, wherein a minimum distance w between the projected area of ​​the slot portion 11 on the protective overlay 5 and the notch 51 applies: w ≤ 30 mm.

[0157] When the projection of the slit portion 11 on the protective pad 5 does not overlap the notch 51, foreign substances such as electrolyte, water, metal chips, and dust can be prevented from easily penetrating through the slit portion 11 into a gas storage chamber enclosed by the protective pad 5, the explosion-proof valve 31, and a support portion 32.

[0158] And by restricting an upper limit of a minimum distance between the projected area of ​​the slot portion 11 on the protective pad 5 and the notch 51, a situation is prevented in which a distance is too large, which would not be conducive to expansion of the slot portion 11 due to heat.

[0159] In some embodiments, the battery assembly further comprises an insulating top plate 4 disposed between the cover plate 33 and the wiring harness board 1; in a direction perpendicular to a plane on which the wiring harness board is located, there is a distance K1 between a surface of the insulating top plate on a side near the wiring harness board and a cover plate body, and there is a distance K2 between a surface of the protective pad on a side near the wiring harness board and the cover plate body, where 0.9 ≤ K1 / K2 ≤ 1.1.

[0160] Advantageously, the surface of the insulating top plate 4 on the side near the wiring harness board 1 is flush with the surface of the protective overlay 5 on the side near the wiring harness board 1. Because 0.9 ≤ K1 / K2 ≤ 1.1, the insulating top plate 4 and the protective overlay 5 can jointly support the wiring harness board 1, providing a support effect for the wiring harness board 1, and since it is a soft support, damage to the wiring harness board 1 is avoided. In some embodiments, the support portion 32 comprises a metal material, and the insulating top plate 4 comprises a plastic material.

[0161] The support portion 32 has a higher support strength than the insulating top plate 4 and a better support effect on a central portion of the wire harness board 1. After the explosive discharge of a high-temperature thermal medium, the thermal medium tends to expand outward from a position of the slot portion 11.

[0162] In some embodiments, as in Fig.As shown in Fig. 3, the wiring harness board 1 includes a wiring harness board body 10, and a detection branch circuit 12 is formed in at least a portion of the wiring harness board 1. A cutting slit 13 is provided between the wiring harness board body 10 and the detection branch circuit 12. In a direction perpendicular to the width direction of the slit portion 11, a perpendicular distance x between a root portion, at which the cutting slit 13 is connected to a main circuit, and an edge of the slit portion 11 on the side near the root portion is 5 mm ≤ x ≤ 30 mm.

[0163] Here, the root portion where the cutting slot 13 is connected to the main circuit refers to a region where the detection branch circuit 12 is connected to the wire harness board body 10.

[0164] By restricting a lower limit for a minimum distance between the cutting slot 13 and the slot portion 11, the cutting slot 13 and the slot portion 11 are prevented from being too close to each other, which would result in insufficient strength of a main body of the wire harness board body 10, and if a distance between the cutting slot 13 and the slot portion 11 is too small, it is not conducive to a cable routing arrangement.

[0165] By restricting an upper limit for the minimum distance between the cutting slot 13 and the slot portion 11, material waste due to an excessively large overall size of the wire harness board 1 is avoided.

[0166] In some embodiments, a projection of the cutting portion 13 on the first surface at least partially overlaps the explosion-proof valve 31, where: 2 mm ≤ b ≤ 20 mm.

[0167] When the projection of the cutting slot 13 on the first surface at least partially overlaps the explosion-proof valve 31, a high-temperature thermal medium can also be explosively discharged from the cutting slot 13. Meanwhile, a width of the slot portion 11 can be reduced accordingly.

[0168] In some embodiments, as in Fig. 3, a longitudinal direction of the slot portion 11 is parallel to a longitudinal direction of the wire harness board 1. In a width direction of the slot portion 11, a total width of the wire harness board 1 is z, where 0.1 ≤ y / z ≤ 0.8.

[0169] When a ratio of a slot width of the cutting slot 13 to the total width of the wiring harness board 1 is excessively large, the slot width of the cutting slot 13 is excessively large, and a routing space remaining for the wiring harness board 1 is reduced; and when the ratio of the slot width of the cutting slot 13 to the total width of the wiring harness board 1 is excessively low, the slot width of the cutting slot 13 is excessively narrow, which is not conducive to rapid diffusion of a high-temperature thermal medium.

[0170] In some embodiments, as in Fig. 12, the wiring harness board 1 further includes a fuse 14. In a width direction of the slot portion 11, a minimum distance A between the fuse 14 and the slot portion 11 is as follows: 1 mm ≤ A ≤ 10 mm.

[0171] If the minimum distance A between the fuse 14 and the slot portion 11 is below a lower limit, the fuse 14 is too close to the slot portion 11, which means that the fuse 14 is relatively close to an explosion-proof valve 31. In such a case, the high-temperature thermal medium may damage the fuse 14 after the explosion-proof valve 31 opens, so that the fuse 14 can no longer perform its function of protecting the circuit of the wiring harness board 1. If the minimum distance A between the fuse 14 and the slot portion 11 exceeds an upper limit, the fuse 14 is too far from the slot portion 11, which means that it is too far from the explosion-proof valve 31, which leads to an increase in product size and makes product implementation difficult.

[0172] A plurality of conductive core wires 16 are arranged within the wiring harness board 1, and the conductive core wires 16 may be copper wires. The fuse 14 is formed by a portion where a wire diameter of the conductive core wire 16 is reduced.

[0173] When a distance between the fuse 14 and a detection branch circuit 12 is comparatively small, a faster response occurs and the safety performance is better.

[0174] In some other embodiments, a preferred range for A may be selected as 2 mm ≤ A ≤ 9 mm.

[0175] In some embodiments, the following applies to a cable diameter B of the fuse 14: 0.1 mm ≤ B ≤ 0.3 mm.

[0176] The wire diameter of the fuse 14 determines the minimum fuse current, where minimum fuse current = permissible minimum voltage / circuit battery resistance.

[0177] By limiting the wire diameter parameter of the fuse 14, it can be ensured that the fuse 14 melts quickly in the event of a short circuit, thus improving safety performance. In some embodiments, the fuse 14 is S-shaped.

[0178] In some embodiments, the following applies for a length D of the fuse 14: 0.16 ≤ D / b ≤ 10.

[0179] The fuse 14 must be able to meet a specified minimum fuse current, and a wire diameter of the fuse 14 is constant. In such a case, the length of the fuse 14 affects a fuse life. If a ratio of the length D of the fuse 14 to a width of the slot portion 11 is too low, it indicates that the width of the slot portion 11 is too large, the fuse is too short, and the fuse life is too short, which does not meet the fuse life requirements; if the ratio is too large, it indicates that the width of the slot portion 11 is too narrow, the fuse is too long, and the fuse life is too long, which also does not meet the fuse life requirements.

[0180] Since the fuse is formed by expanding and narrowing a conductive core wire 16 on a main circuit, the length of the fuse is shorter after a fuse with a fixed wire diameter is formed by expanding a thinner main body when a single conductive core wire 16 is thinner.

[0181] At this time, the wider the width of the slot portion 11, the smaller the overall routing space of the wiring harness board 1. When the number of detection lines is fixed, that is, when the number of wired lines is fixed, each conductive core wire 16 becomes thinner, the correspondingly formed fuse is shorter, and the melting time becomes faster.

[0182] However, the length of a fuse must not be too short, otherwise it would not meet the melting time requirements.

[0183] This means that the lower the ratio of the length of the fuse 14 to the width of the slot portion 11, the shorter the fuse 14 and the wider the width of the slot portion 11, so that a single conductive core wire 16 is thinner and the fuse's melting time is also faster. As long as the melting time requirements are met, the shorter the fuse's melting time, the better. Accordingly, the larger the ratio of the length of the fuse 14 to the width of the slot portion 11, the longer the fuse 14 and the narrower the width of the slot portion 11, so that a single conductive core wire 16 is thicker and the fuse's melting time is also slower. If a certain limit is exceeded, safety hazards may arise.

[0184] In some embodiments, the following applies for a length D of the fuse 14: 8 mm ≤ D ≤ 15 mm.

[0185] The fuse 14 must be able to meet a specified minimum fuse current, and the wire diameter of the fuse 14 is constant. At this time, the length of the fuse 14 affects the fuse life. If the length of the fuse 14 is too long, it indicates that a conductive core wire 16 of a main circuit is thicker, which is neither conducive to material savings and cost reduction nor space saving. However, the length of the fuse 14 cannot be too short, otherwise it would not meet the fuse life requirements.

[0186] In some embodiments, the wiring harness board 1 further includes a conductive core wire 16 and a protective film 15 covering the conductive core wire 16. The number of conductive core wires 16 is defined as E, and a wire diameter of the conductive core wire 16 is defined as F. In a width direction of the slot portion 11, a total width of the wiring harness board 1 is z, where: 0.05≤(E⋅F / z) / b≤15; and where: 1 mm≤b≤60 mm; 3≤E⋅F≤15.

[0187] In a comparison expression, (E·F / z) / b represents the physical value of the width ratio of the conductive core wire 16 in the wiring harness board 1, and the denominator represents the width of the slot portion 11. The width of the slot portion 11 is influenced by the distance between the positive and negative poles of a battery and is within a specified range. If the ratio is too large, it indicates that the width ratio of the conductive core wire 16 in the wiring harness board 1 is too large and that the width of the slot portion 11 is too narrow.Since a melting point of the conductive core wire 16 is generally comparatively high, the conductive core wire 16 generally does not melt after the opening of an explosion-proof valve, so that a large area of ​​the conductive core wire 16 covers an area of ​​the explosion-proof valve, which affects a rapid opening of the explosion-proof valve; if the ratio is too low, it indicates that the width ratio of the conductive core wire 16 in the wiring harness board 1 is too low and the width of the slot portion 11 is too large, which easily causes a complete explosion-proof element to be forcibly ejected.

[0188] In some embodiments, the thickness G of the protective film 15 in a direction perpendicular to the wiring harness board 1 is: 0.2 ≤ G / b ≤ 4.17.

[0189] The thicker the protective film 15 is, the less likely it is to shrink due to heat, and the slower the expansion rate of a gap of the slit portion 11 is, the larger the initial width of the slit portion 11 should be. Accordingly, the thinner the protective film 15 is, the more likely it is to shrink due to heat, and if the expansion rate of the gap of the slit portion 11 is higher, the initial width of the slit portion 11 can be set to be correspondingly smaller.

[0190] In this embodiment, 1 mm ≤ b ≤ 60 mm was selected. The range of values ​​for the thickness G of a single-layer protective film 15 can be: 25 micrometers ≤ G ≤ 200 micrometers.

[0191] In some embodiments, the slot portion 11 is formed by a gap between two adjacently arranged wiring harness boards 1.

[0192] In some other embodiments, the slot portion 11 is formed by hollowing out at least a portion of a single wire harness board 1.

[0193] In some embodiments, a plurality of battery cells 3 are stacked to form a battery row 2, and the slot portion 11 extends continuously in a stacking direction of the battery cell 3. In some other embodiments, a plurality of battery cells 3 are stacked to form a battery row 2. The wire harness board 1 is provided with a plurality of slot portions 11 in a stacking direction of the battery row 2, and a spacer portion 17 is formed between two adjacent slot portions 11.

[0194] By forming the spacer portion 17 between two adjacent slot portions 11, an overall strength of the wire harness board 1 can be improved.

[0195] In this embodiment, a gap between two adjacent battery cells 3 is arranged corresponding to the spacing section 17.

[0196] By appropriately providing the gap between two adjacent battery cells 3 to the spacer portion, dust accumulation can be avoided, dust can be prevented from entering the gap between two adjacent battery cells 3, and safety performance can be improved. Meanwhile, the overall strength of the wiring harness board 1 can also be increased.

[0197] In some embodiments, the thickness H of the wiring harness board 1 is: 0.08 mm ≤ H ≤ 0.335 mm; the temperature resistance performance parameters of the wiring harness board 1 are: -40°C ~ 85°C (1000h); a specific test method for the temperature resistance performance of the wiring harness board 1 is as follows: 1 Low-temperature test: The sample is stored at a temperature of -40°C for 1000 hours. During the test, the adhesive appearance on the sample is checked after 250 hours, 500 hours, and 1000 hours. The resistance value of each NTC resistor is measured at room temperature, recording the ambient temperature (the FPC should be left at room temperature for 10 minutes, and the resistance value test should be performed only when the FPC temperature is equal to room temperature). Each resistance value test must be completed within 24±2 hours. ② High-temperature test: The sample is stored at a temperature of 85°C for 1000 hours. During the test, the appearance of the adhesive on the sample is checked after 250 hours, 500 hours, and 1000 hours. The resistance value of each NTC resistor is measured at room temperature, recording the ambient temperature (the FPC should be left at room temperature for 10 minutes, and the resistance value test should be performed only when the FPC temperature is equal to room temperature). Each resistance value test must be completed within 24±2 hours.

[0198] After the low-temperature test, the FPC's performance generally meets the insulation and withstand voltage requirements. Its appearance shows no damage, cracks, adhesive cracks, or other defects. After the test, the NTC resistance value is measured at 25°C and compared with the corresponding resistance value in the resistance value table. The error must be within ± 1°C.

[0199] After the high-temperature test, the FPC's performance generally meets the insulation and withstand voltage requirements. Its appearance shows no damage, cracks, adhesive cracks, or other defects. After the test, the NTC resistance value is measured at 25°C and compared with the corresponding resistance value in the resistance value table. The error must be within ± 1°C.

[0200] The insulation performance parameters of the wiring harness board 1 are as follows: ① The insulation resistance and withstand voltage leakage current between sensing lines of the FPC are as follows: insulation resistance ≥ 100 MΩ @ 1000 VDC (60S), withstand voltage leakage current ≤ 1 mA @ 1000 VDC (60S), no flashover and no failure during the test; ② For insulation resistance and withstand voltage leakage current between FPC and an insulation layer: insulation resistance ≥ 500 MΩ @ 1000 VDC (60S), withstand voltage leakage current ≤ 1 mA @ 2800 VDC (60S).

[0201] A specific test procedure for the insulation performance of the wiring harness board 1 is as follows: ① The test method for insulation resistance and withstand voltage leakage current between the detection lines of the FPC is: 1. Adjust the voltage value of an insulation resistance voltage tester to 1000V DC, test the insulation resistance between adjacent detection lines using a connector, read the measured resistance value, and record the results. 2. Adjust the voltage value of an insulation resistance voltage tester to 1000V DC, test the withstand voltage leakage current value between adjacent detection lines using a connector, read the leakage current value, and record the results (Note: Positive and negative circuits of the same NTC resistor should be combined into one line, and multiple lines of the same detection point should be combined into one line). ② The test method for insulation resistance and withstand voltage leakage current between FPC and insulation layer is as follows: 1. Adjust the voltage value of an insulation resistance voltage tester to 1000V DC, test the insulation resistance between any FPC sensing line and the outer surface of the FPC insulation layer, read the measured resistance value, and record it. 2. Adjust the voltage value of an insulation resistance voltage tester to 2800V DC, test the withstand voltage leakage current value between any FPC sensing line and the outer surface of the FPC insulation layer, read the measured leakage current value, and record it (Note: Positive and negative circuits of the same NTC resistor should be combined into one line, and multiple lines of the same sensing point should be combined into one line).

[0202] In some embodiments, the battery cell 3 comprises a housing 35, wherein the housing 35 is a steel housing, and the dimension a of the remaining portion 311 is: 10 mm ≤ a ≤ 15 mm; and the following applies: 0.033 ≤ b / a ≤ 2.

[0203] The housing 35 is a steel housing. Since steel has a high melting point and high hardness, this results in a large valve opening pressure, and gas pressure after valve opening has a greater impact on the wiring harness board 1. At this time, the width of the slot portion 11 can be set smaller accordingly.

[0204] The remaining section 311 can be specified as larger accordingly. The remaining section 311 has more connections to other areas of the enclosure or a cover plate, so that an explosion-proof element is less likely to penetrate the remaining section 311 and be forcibly ejected after a force is applied.

[0205] In some other embodiments, the battery cell 3 includes a housing 35, and the housing 35 is an aluminum housing.

[0206] In some embodiments, the battery cell 3 comprises a pole 34, wherein the pole 34 and the explosion-proof valve 31 are arranged on a same side surface of the battery cell 3. The explosion-proof valve 31 is located between the poles 34 of two polarities, and the explosion-proof valve 31 and the pole 34 are arranged spaced apart from each other, wherein a length dimension of the first surface is defined as L, for which 0.05 ≤ c / L ≤ 12, and 0.008 ≤ b / c ≤ 3.

[0207] Since the terminal 34 and the explosion-proof valve 31 are arranged on the same side surface of the battery cell 3, and the explosion-proof valve 31 is located between the terminals 34 of two polarities, and the explosion-proof valve 31 and the terminals 34 are spaced apart from each other, it is undesirable for a high-temperature thermal medium to explosively discharge to the terminal when the explosion-proof valve 31 opens, so as to prevent a short circuit and subsequent thermal runaway. Therefore, the space required for the explosion-proof valve 31 and the wiring harness board 1 located above the explosion-proof valve 31 is limited, and the explosion-proof valve 31 and the wiring harness board 1 are not too wide. However, in order to achieve a weight reduction ratio in a short time, a zone of the explosion-proof valve 31 must not be too small either.Therefore, by restricting a lower limit of c / L, an insufficient valve opening zone due to an excessively small zone of the explosion-proof valve 31 is avoided. By restricting an upper limit of c / L, an excessively small distance between the explosion-proof valve 31 and the pole is avoided, which prevents the high-temperature thermal medium from explosively discharging onto the pole.

[0208] And by further restricting an upper limit for b / c, an excessively large width of the slot portion 11 can be avoided, thus preventing insufficient routing space when the width of the wire harness board 1 is itself restricted. By restricting a lower limit for b / c, an excessively small width of the slot portion 11, which would be disadvantageous for pressure relief, can be prevented.

[0209] In some other embodiments, the battery cell 3 includes a terminal 34, and the terminal 34 and the explosion-proof valve 31 are arranged on different side surfaces of the battery cell 3. In a width direction of the slot portion 11, the total width z of the wire harness board 1 satisfies: 10 mm ≤ z ≤ 250 mm; and 0.004 ≤ b / c ≤ 3.

[0210] Since the terminal 34 and the explosion-proof valve 31 are arranged on different side surfaces of the battery cell 3, when the explosion-proof valve 31 opens, there is no space restriction by the terminal, and the high-temperature thermal medium will not explosively discharge to the terminal. Therefore, the range for c / L can be appropriately increased. By further restricting the upper limit of b / c, an excessively large width of the slot portion 11 can be avoided, thus preventing insufficient routing space when the width of the wire harness board 1 is itself restricted. By restricting the lower limit of b / c, an excessively small width of the slot portion 11 can be prevented, which would otherwise hinder pressure relief. In one embodiment, the explosion-proof valve 31 is arranged on an upper surface of the battery cell 3.

[0211] When the explosion-proof valve 31 is arranged on the top side of the battery cell 3, the width of the slot portion 11 can be increased accordingly, since rapid heat diffusion is desired to prevent heat from being excessively concentrated and accumulated and penetrating through the housing cover or even reaching the passenger compartment.

[0212] In another embodiment, the explosion-proof valve 31 is arranged on a side surface of the battery cell 3.

[0213] When the explosion-proof valve 31 is arranged on the side surface of the battery cell 3, a certain degree of concentration of a high-temperature thermal medium is permissible and the width of the slit portion 11 can be reduced accordingly, since the safety risk on the side surface is comparatively small and heat is less likely to concentrate and accumulate to the point of piercing through the case cover or even penetrating into the passenger compartment.

[0214] In this embodiment, a value of the total width z of the wire harness board 1 may 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 may be within an interval range formed by any two of the above values. In some embodiments, the battery cell 3 includes a cover plate 33, the cover plate 33 being provided with a liquid injection hole 331, and a projection of the slit portion 11 on a plane on which the cover plate 33 is located does not overlap the liquid injection hole 331; and for a minimum distance I between the projected area of ​​the slot portion 11 on the plane on which the cover plate 33 is located and the liquid injection hole 331, 5 mm ≤ I ≤ 188 mm.

[0215] By making the projected area of ​​the slit portion 11 on the plane on which the cover plate 33 is located so that it does not overlap the liquid injection hole 331, foreign matters such as electrolyte, water, metal chips, and dust can be prevented from falling into the slit portion 11 onto the liquid injection hole 331, thus preventing damage to the liquid injection hole 331.

[0216] By restricting a lower limit of the minimum distance between the projected area of ​​the slot portion 11 on the plane where the cover plate 33 is located and the liquid injection hole 331, erosion of the liquid injection hole 331 by foreign matter can be prevented. At the same time, by restricting an upper limit of the minimum distance between the projected area of ​​the slot portion 11 on the plane where the cover plate 33 is located and the liquid injection hole 331, the overall dimensional parameters of a battery can be reasonably controlled, thus preventing inappropriate design and material waste.

[0217] In this embodiment, a value of the minimum distance I between the projected area of ​​the slit portion 11 on the plane on which the cover plate 33 is located and the liquid injection hole 331 may 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 may be within an interval range formed by any two of the above values. In some embodiments, the battery capacity of the battery cell 3 is defined as J, for which 0.0004 mm / Ah ≤ b / J ≤ 0.5 mm / Ah.

[0218] Since the battery capacity is related to a weight loss ratio that must be achieved when an explosion-proof valve opens, the larger the battery capacity, the wider a width of the slot portion 11 must be to avoid failing to meet weight loss requirements.

[0219] In some embodiments, the battery cell 3 comprises a housing 35, wherein the housing 35 is provided with an opening portion, and the battery cell 3 further comprises a cover plate 33 which covers the opening portion, wherein the cover plate 33 and the housing 35 together form a receiving space, wherein a length range of the receiving space is: 100 mm - 380 mm; a width range of the receiving space is: 50 mm - 250 mm; a thickness range of the receiving space is: 15 mm - 100 mm.

[0220] On the other hand, according to an embodiment of the present application, there is further provided a battery pack comprising: the battery assembly as described above; a base plate, wherein the battery cell 3 is arranged on the base plate and wherein the wiring harness board 1 is arranged on a side of the battery cell 3 facing away from the base plate.

[0221] It should be understood that the above-described embodiments are for illustrative purposes only and are not intended to limit the modes of implementation. Although embodiments of the present application have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations are necessarily within the scope of the present application.

Claims

[1] Battery assembly comprising: a battery cell (3) with a housing (35), wherein the housing (35) has an explosion-proof valve (31); wherein a surface of the housing (35) on which the explosion-proof valve (31) is arranged is defined as a first surface; wherein the explosion-proof valve (31) has a non-closed tapered portion (312), wherein the tapered portion (312) is configured such that gas can be released from the interior of the battery cell (3) by breaking through the tapered portion (312); and a residual portion (311) located in a non-closed region of the tapered portion (312), wherein the tapered portion (312) and the residual portion (311) together form a continuous closed ring pattern; wherein, in a direction perpendicular to the first surface, the thickness of the residual portion (311) is greater than the thickness of the tapered portion (312); a wiring harness board (1), wherein the wiring harness board (1) has an information acquisition module configured to detect the battery temperature and / or the voltage of at least one battery cell (3); wherein the wiring harness board (1) is arranged on the side of the battery cell (3) having the explosion-proof valve (31); wherein the wiring harness board (1) is formed with a slit portion (11), wherein the slit portion (11) penetrates upper and lower surfaces of the wiring harness board (1) and thus forms a gap; wherein the projection of the slit portion (11) on the first surface at least partially overlaps the explosion-proof valve (31); wherein two ends of the tapered portion (312) form a first end point and a second end point, wherein a region between the first end point and the second end point of the tapered portion (312) forms the remaining portion (311), and wherein a straight-line distance between the first end point and the second end point is defined as a dimension a of the remaining portion (311); wherein, in the width direction of the slit portion (11), the width of the slit portion (11) is defined as b; wherein a dimension of the explosion-proof valve (31) is defined as c, where c > b and 0.01 ≤ b / a ≤ 12. [2] The battery assembly of claim 1, wherein the explosion-proof valve (31) has a continuous tapered portion (312), and wherein the tapered portion (312) and the remaining portion (311) together form a continuous closed ring pattern. [3] The battery assembly according to claim 1, wherein a projection of the slit portion (11) on the plane on which the first surface is located at least partially overlaps the remaining portion (311); and wherein, in the width direction of the slit portion (11), a width b of the slit portion (11) satisfies: 10 mm ≤ b ≤ 50 mm; and 0.25 ≤ b / a ≤ 10. [4] The battery assembly according to claim 3, wherein the projection of the slit portion (11) on the first surface completely covers the remaining portion (311); and wherein, in the width direction of the slit portion (11), a width b of the slit portion (11) satisfies: 2 mm ≤ b ≤ 10 mm; and 0.2 ≤ b / a ≤ 2. [5] The battery assembly according to claim 1, wherein the projection of the slit portion (11) on the first surface does not overlap the remaining portion (311); and wherein, in the width direction of the slit portion (11), a width b of the slit portion (11) is: 0.5 mm ≤ b ≤ 20 mm; and wherein: 0.012 ≤ b / a ≤ 4. [6] The battery assembly according to any one of claims 1 to 5, wherein the longitudinal direction of the slit portion (11) is parallel to the longitudinal direction of the wire harness board (1), wherein the slit portion (11) is arranged at a central position of the wire harness board (1) in the width direction of the slit portion (11), and wherein the projection of the slit portion (11) on the first surface overlaps with the central position of the explosion-proof valve (31). [7] The battery assembly according to any one of claims 1 to 5, wherein a longitudinal direction of the slit portion (11) is parallel to a longitudinal direction of the wire harness board (1), wherein, in the width direction of the slit portion (11), a perpendicular distance d between an edge of the slit portion (11) on a side near a center line of the wire harness board (1) and the center line of the wire harness board (1) is 0.5 mm ≤ d ≤ 20 mm. [8] A battery assembly according to any one of claims 1 to 5, wherein the longitudinal direction of the explosion-proof valve (31) is parallel to the longitudinal direction of the first surface; wherein the longitudinal direction of the slit portion (11) is perpendicular to the longitudinal direction of the remaining portion (311), where 1 mm ≤ b ≤ 60 mm. [9] The battery assembly according to any one of claims 1 to 5, wherein the longitudinal direction of the explosion-proof valve (31) is parallel to the thickness direction of the battery cell (3); wherein the longitudinal direction of the slit portion (11) is parallel to the longitudinal direction of the remaining portion (311), where: 0.5 mm ≤ b ≤ 40 mm. [10] The battery assembly according to claim 1, wherein a plurality of the battery cells (3) are stacked to form a battery row (2); wherein a stacking direction of the battery row (2) is parallel to a width direction of the first surface; wherein the longitudinal direction of the residual portion (311) is parallel to the width direction of the first surface; wherein, in the longitudinal direction of the first surface, the residual portions (311) of the explosion-proof valves (31) of two adjacent battery cells (3) are arranged facing away from each other; wherein the longitudinal direction of the slit portion (11) is parallel to the width direction of the first surface; wherein, in the width direction of the slit portion (11), the width b of the slit portion (11) is: 0.5 mm ≤ b ≤ 50 mm. [11] Battery assembly according to claim 10, wherein in a direction perpendicular to a plane on which the wiring harness board (1) is located, the thickness f of the wiring harness board (1) is: 140 micrometers ≤ f ≤ 185 micrometers. [12] The battery assembly according to claim 1, wherein a plurality of the battery cells (3) are stacked to form a battery series (2); wherein, based on a current arrangement of the battery cell (3), the remaining portions (311) of the explosion-proof valves (31) of two adjacent battery cells (3) are arranged in the same position on the first surface; wherein the longitudinal direction of the slit portion (11) is parallel to the width direction of the first surface; wherein, in the width direction of the slit portion (11), the width b of the slit portion (11) is: 1 mm ≤ b ≤ 60 mm. [13] Battery assembly according to claim 12, wherein in a direction perpendicular to a plane where the wire harness board (1) is located, the thickness f of the wire harness board (1) is: 155 micrometers ≤ f ≤ 235 micrometers. [14] The battery assembly according to claim 1, wherein a plurality of the battery cells (3) are stacked to form a battery row (2); wherein the longitudinal direction of the residual portion (311) is parallel to the longitudinal direction of the first surface; wherein, in the width direction of the first surface, the residual portion (311) of the explosion-proof valve (31) of the battery cell (3) is arranged on one side near the residual portion (311) of the explosion-proof valve (31) of the battery cell (3) and on the other side away from the residual portion (311) of the explosion-proof valve (31) of the battery cell (3); wherein the longitudinal direction of the slit portion (11) is parallel to the width direction of the first surface; wherein, in the width direction of the slit portion (11), the width b of the slit portion (11) is: 1 mm ≤ b ≤ 50 mm. [15] Battery assembly according to claim 14, wherein in a direction perpendicular to the plane in which the wiring harness board (1) is located, the thickness f of the wiring harness board (1) is: 185 micrometers ≤ f ≤ 335 micrometers. [16] The battery assembly according to claim 1, wherein the housing (35) comprises a cover plate (33); wherein the explosion-proof valve (31) is arranged on the cover plate (33) and is located on the surface of the cover plate (33) facing the wire harness board (1) or the surface of the cover plate (33) facing away from the wire harness board (1); wherein the cover plate (33) is further provided with a support portion (32) surrounding an outer peripheral side of the explosion-proof valve (31), the support portion (32) extending toward the wire harness board (1) and configured to support the wire harness board (1). [17] The battery assembly according to claim 16, wherein the explosion-proof valve (31) is disposed on the surface of the cover plate (33) facing away from the wiring harness board (1); wherein the support portion (32) is disposed between the wiring harness board (1) and the explosion-proof valve (31) to form a clearance portion (6) between the wiring harness board (1) and the explosion-proof valve (31). [18] The battery assembly according to claim 16, wherein the support portion (32) is arranged on both sides of the longitudinal direction of the explosion-proof valve (31) and extends in the width direction of the explosion-proof valve (31); and / or wherein the support portion (32) is arranged on both sides of the width direction of the explosion-proof valve (31) and extends in the longitudinal direction of the explosion-proof valve (31). [19] A battery assembly according to claim 16, wherein the support portion (32) is arranged to completely surround the explosion-proof valve (31). [20] Battery assembly according to claim 19, wherein the support portion (32) is racetrack-shaped. [21] The battery assembly according to claim 16, wherein the support portion (32) and the cover plate (33) are integrally formed; wherein the cover plate (33) is a metal part. [22] Battery assembly according to claim 16, wherein, in a direction perpendicular to the plane on which the cover plate (33) is located, the height h of a projected area of ​​the support portion (32) on a surface of the cover plate (33) on a side facing the wire harness board (1) is: 0.005 ≤ h / b ≤ 2. [23] A battery assembly according to claim 16, wherein, parallel to the plane on which the cover plate (33) is located, a distance between a surface of the support portion (32) on a side near the explosion-proof valve (31) and a surface on a side remote from the explosion-proof valve (31) is defined as a thickness j of the support portion (32), for which 0.008 ≤ j / b ≤ 3 applies. [24] The battery assembly of claim 16, wherein a protective pad (5) is disposed between the slit portion (11) and the explosion-proof valve (31), the protective pad (5) being configured to prevent contaminants from falling onto the explosion-proof valve (31), and the projection of the slit portion (11) on the first surface overlaps the protective pad (5). [25] The battery assembly according to claim 24, wherein the wire harness board (1) comprises a wire harness board body (10), and wherein the thickness of the wire harness board body (10) is defined as m, and wherein the thickness of the protective pad (5) is defined as k, where: 0.29 ≤ k / m ≤ 2.

14. [26] Battery assembly according to claim 24, wherein the thickness of the protective overlay (5) is defined as k, where: 0.0016 ≤ k / b ≤ 0.

6. [27] Battery assembly according to claim 24, wherein the protective pad (5) is fixed to one side of the support portion (32) in the direction of the wire harness board (1). [28] The battery assembly of claim 24, wherein the projection of the protective overlay (5) on the first surface covers the tapered portion (312). [29] The battery assembly according to claim 24, wherein the cover plate (33) is further provided with a support portion (32) surrounding an outer peripheral side of the explosion-proof valve (31), and wherein the support portion (32) is provided with an air guide groove (321); wherein a direction from a surface of the support portion (32) on a side near the explosion-proof valve (31) to a surface on a side remote from the explosion-proof valve (31) is defined as a thickness direction of the support portion (32); wherein, in the thickness direction of the support portion (32), the air guide groove (321) penetrates the support portion (32); wherein parallel to the plane on which the explosion-proof valve (31) is located and perpendicular to the thickness direction of the support section (32), for a maximum width n of the air guide groove (321) applies: 0.0016 ≤ n / b ≤ 2. [30] Battery assembly according to claim 29, wherein in a direction perpendicular to the plane on which the explosion-proof valve (31) is located, the maximum height o of the air guide groove (321) is: 0.0016 ≤ o / b ≤ 1. [31] The battery assembly according to claim 29, wherein a projection of the slit portion (11) on the first surface overlaps the air guide groove (321), where: 0.01 ≤ n / b ≤ 2. [32] The battery assembly according to claim 29, wherein a projection of the slit portion (11) on the first surface does not overlap the air guide groove (321), where: 0.0016 ≤ n / b ≤ 1.

9. [33] The battery assembly according to claim 29, wherein the air guide groove (321) is a V-shaped groove, and wherein an opening cross-sectional area of ​​the support portion (32) gradually decreases from a side of the support portion (32) near the wire harness board (1) toward a side facing away from the wire harness board (1). [34] Battery assembly according to claim 29, wherein the protective pad (5) is adhesively connected to the support portion (32). [35] Battery assembly according to claim 34, wherein at least a part of the overlapping region of the protective pad (5) and the support portion (32) is provided with an adhesive layer for adhesion, and wherein, in a direction perpendicular to the plane on which the protective pad (5) is located, the adhesive layer is locally formed with an indentation so that the projection of the adhesive layer does not overlap the air guide groove (321). [36] Battery arrangement according to claim 35, wherein the width p of the indentation parallel to the plane on which the protective support (5) is located and perpendicular to the thickness direction of the support section (32) is: 2 ≤ n / p ≤ 5. [37] Battery assembly according to claim 24, wherein the protective pad (5) is provided with a notch (51), and wherein the notch (51) penetrates the protective pad (5) in a direction perpendicular to the plane on which the protective pad (5) is located; wherein the total length q of the notch (51) is: 0.016 ≤ q / b ≤ 10. [38] Battery assembly according to claim 37, wherein the thickness of the protective pad (5) is defined as k, where: 10 ≤ q / k ≤ 100 and 0.1 mm ≤ k ≤ 0.3 mm. [39] Battery arrangement according to claim 37, wherein in a direction perpendicular to the plane on which the protective support (5) is located, a zone s of a region is encompassed by the peripheral edge of the protective support (5); wherein in a direction perpendicular to the plane on which a cover plate (33) is located, a zone t of a region is encompassed by the peripheral edge of the cover plate (33), where: 300 mm 2 ≤ s ≤ 1500 mm 2 and 0.015 ≤ s / t ≤ 0.

75. [40] Battery assembly according to claim 37, wherein the cover plate (33) is provided with a liquid injection hole (331), wherein the minimum distance u between the liquid injection hole (331) and the protective pad (5) is: 5 mm ≤ u ≤ 54 mm. [41] A battery assembly according to claim 37, wherein at least a portion of the notch (51) is not aligned along a single straight line, such that the protective overlay (5) forms at least one overhang portion (52); wherein the overhang portion (52) comprises a first end point (501) and a second end point (502), wherein at least a portion of the notch (51) extends continuously from the first end point (501) to the second end point (502); wherein a zone v of the overhang portion (52) is defined by the zone encompassed by a connecting line between the first end point (501) and the second end point (502) and the notch (51) between the first end point (501) and the second end point (502), where: 1.1 mm 2 ≤ v ≤ 12.5 mm 2 . [42] A battery assembly according to claim 37, wherein a projection of the slot portion (11) on a plane on which the protective overlay (5) is located at least partially overlaps the notch (51). [43] Battery assembly according to claim 37, wherein a projection of the slot portion (11) on a plane on which the protective overlay (5) is located does not overlap the notch (51), wherein a minimum distance w between the projected area of ​​the slot portion (11) on the plane on which the protective overlay (5) is located and the notch (51) is: w ≤ 30 mm. [44] The battery assembly according to claim 24, further comprising: an insulating top plate (4) disposed between the cover plate (33) and the wire harness board (1); wherein, in a direction perpendicular to the plane on which the wire harness board (1) is located, a distance K1 is provided between a surface of the insulating top plate (4) on a side near the wire harness board (1) and a cover plate body, and a distance K2 is provided between a surface of the protective pad (5) on a side near the wire harness board (1) and the cover plate body K2, where 0.9 ≤ K1 / K2 ≤ 1.

1. [45] The battery assembly according to claim 1, wherein the wiring harness board (1) comprises a wiring harness board body (10) and a detection branch circuit (12) formed in at least a partial area of ​​the wiring harness board (1); wherein the wiring harness board body (10) and the detection branch circuit (12) are provided with a cutting slit (13) therebetween; wherein, in a direction perpendicular to a width direction of the slit portion (11), a perpendicular distance x from a trunk portion, at which the cutting slit (13) is connected to a main circuit, to an edge of the slit portion (11) on a side near the trunk portion is: 5 mm ≤ x ≤ 30 mm. [46] A battery assembly according to claim 45, wherein when the projection of the cutting portion (13) on the first surface at least partially overlaps the explosion-proof valve (31), the following applies: 2 mm ≤ b ≤ 20 mm. [47] Battery assembly according to claim 45, wherein the longitudinal direction of the slot portion (11) is parallel to the longitudinal direction of the wire harness board (1), and wherein in the width direction of the slot portion (11), the total width z of the wire harness board (1) is: 0.1 ≤ y / z ≤ 0.

8. [48] ​​The battery assembly according to claim 1, wherein the wire harness board (1) further comprises a fuse (14), and wherein, in the width direction of the slot portion (11), a distance A between the fuse (14) and the slot portion (11) is 1 mm ≤ A ≤ 10 mm. [49] Battery arrangement according to claim 48, wherein the following applies to a line diameter B of the fuse (14): 0.1 mm ≤ B ≤ 0.3 mm. [50] Battery arrangement according to claim 48, wherein for a length D of the fuse (14) the following applies: 0.16 ≤ D / b ≤ 10. [51] Battery arrangement according to claim 48, wherein for a length D of the fuse (14) the following applies: 8 mm ≤ D ≤ 15 mm. [52] The battery assembly according to claim 48, wherein the wiring harness board (1) further comprises a conductive core wire (16) and a protective film (15) covering the conductive core wire (16), wherein the number of the conductive core wires (16) is defined as E, the wire diameter of the conductive core wire (16) is defined as F, and the total width of the wiring harness board (1) in the width direction of the slot portion (11) is defined as z, where: 0.05 ≤ (E·F / z) / b ≤ 15; 1 mm ≤ b ≤ 60 mm; 3 ≤ E·F ≤ 15. [53] Battery assembly according to claim 52, wherein in a direction perpendicular to the wiring harness board (1) the thickness G of the protective film (15) is: 0.2 ≤ G / b ≤ 4.

17. [54] Battery assembly according to claim 1, wherein the slot portion (11) is formed by a gap between two adjacently arranged wire harness boards (1). [55] The battery assembly according to claim 1, wherein the slit portion (11) is formed by hollowing out at least a portion of a single wire harness board (1). [56] A battery assembly according to claim 1, wherein a plurality of the battery cells (3) are stacked to form a battery row (2), and wherein the slit portion (11) extends continuously in a stacking direction of the battery cell (3). [57] The battery assembly according to claim 1, wherein a plurality of the battery cells (3) are stacked to form a battery series (2), and wherein the wire harness board (1) is provided with a plurality of the slot portions (11) in a stacking direction of the battery series (2), and wherein a spacer portion (17) is formed between two adjacent slot portions (11). [58] Battery arrangement according to claim 57, wherein a gap between two adjacent battery cells (3) is arranged corresponding to the spacing section (17). [59] Battery assembly according to claim 1, wherein the battery cell (3) comprises a housing (35), wherein the housing (35) is a steel housing, and wherein the dimension a of the remaining portion (311) is: 10 mm ≤ a ≤ 15 mm; and wherein the following applies: 0.033 ≤ b / a ≤ 2. [60] Battery assembly according to claim 1, wherein the battery cell (3) comprises a housing (35) and wherein the housing (35) is an aluminum housing. [61] A battery assembly according to claim 2, wherein the battery cell (3) comprises a pole (34), and wherein the pole (34) and the explosion-proof valve (31) are arranged on the same side surface of the battery cell (3), wherein the explosion-proof valve (31) is located between the poles (34) of two polarities, and wherein the explosion-proof valve (31) and the pole (34) are arranged spaced apart from each other; wherein the length of the first surface is defined as L, for which 0.05 ≤ c / L ≤ 12, and 0.008 ≤ b / c ≤ 3. [62] The battery assembly according to claim 2, wherein the battery cell (3) comprises a terminal (34), and wherein the terminal (34) and the explosion-proof valve (31) are arranged on different side surfaces of the battery cell (3); wherein the total width z of the wire harness board (1) in the width direction of the slot portion (11) is: 10 mm ≤ z ≤ 250 mm; and 0.004 ≤ b / c ≤ 3. [63] Battery assembly according to claim 61, wherein the explosion-proof valve is arranged on the top side of the battery cell (3). [64] Battery assembly according to claim 62, wherein the explosion-proof valve is arranged on a side surface of the battery cell (3). [65] Battery assembly according to claim 1, wherein the battery cell (3) comprises a cover plate (33), wherein the cover plate (33) is provided with a liquid injection hole (331), and wherein the projection of the slot portion (11) on the plane on which the cover plate (33) is located does not overlap the liquid injection hole (331); and wherein a minimum distance I between the projected area of ​​the slot portion (11) on the plane on which the cover plate (33) is located and the liquid injection hole (331) is: 5 mm ≤ I ≤ 188 mm. [66] Battery assembly according to claim 1, wherein the battery capacity of the battery cell (3) is defined as J, where: 0.0004 mm / Ah ≤ b / J ≤ 0.5 mm / Ah. [67] The battery assembly according to claim 1, wherein the battery cell (3) comprises a housing (35), the housing (35) being provided with an opening portion, and the battery cell (3) further comprising a cover plate (33) covering the opening portion, the cover plate (33) and the housing (35) together forming an accommodating space; the length range of the accommodating space being: 100 mm - 380 mm; a width range of the accommodating space being: 50 mm - 250 mm; a thickness range of the accommodating space being: 15 mm - 100 mm. [68] A battery pack comprising: a battery assembly according to any one of claims 1 to 67; and a base plate, wherein the battery cell (3) is arranged on the base plate, and wherein the wire harness board (1) is arranged on the side of the battery cell (3) opposite the base plate.

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