Battery assembly and battery pack

Abstract

Battery assembly, characterized in that it comprises the following: a battery cell (3) comprising a housing (35), the housing (35) being provided with a safety valve (31); wherein a side of the housing (35) being provided with the safety valve (31) is defined as the first surface and the safety valve (31) comprises an open weakening area (312), the weakening area (312) being designed to allow pressure relief of the battery cell (3) by tearing open the weakening area (312); and a residual section (311) located within the open portion of the weakening area (312), the weakening area (312) and the residual section (311) together enclosing a continuous closed annular contour; wherein, along a direction perpendicular to the first surface, the thickness of the residual section (311) is greater than the thickness of the weakening area (312); a wiring harness panel (1), wherein the wiring harness panel (1) comprises an information acquisition component designed to acquire the battery temperature and / or voltage of at least one battery cell (3), and located on the side of the battery cell (3) that is provided with the safety valve (31); wherein the wiring harness panel (1) has a slot section (11) extending through the top and bottom surfaces of the wiring harness panel (1) and forming a slot; wherein a projection of the slot section (11) overlaps at least partially with the safety valve (31) in the direction of the first surface; wherein the two ends of the intended weakening area (312) form a first end section and a second end section, and the area between the first end section and the second end section of the intended weakening area (312) forms the residual section (311), wherein the straight-line distance between the first end section and the second end section is defined as dimension a of the residual section (311), along the width direction of the slot section (11) the width of the slot section (11) is defined as b and the dimension of the safety valve (31) is defined as c, wherein: c > b and 0.01≤b / a≤12; wherein the multiple battery cells (3) are stacked to form a cell row (2), and wherein the longitudinal direction of the residual section (311) is parallel to the longitudinal direction of the first surface; wherein along the transverse direction of the first surface the residual section (311) of the safety valve (31) of one of the battery cells (3) is arranged facing the residual section (311) of the safety valve (31) of the battery cell (3) on one side and facing away from the residual section (311) of the safety valve (31) of the battery cell (3) on the other side; wherein the longitudinal direction of the slot section (11) is parallel to the transverse direction of the first surface and along the transverse direction of the slot section (11) the width b of the slot section (11) satisfies the condition: 1 mm ≤ b ≤ 50 mm; wherein the battery cell (3) comprises a housing (35), wherein the housing (35) is a steel shell and the dimension a of the remaining section (311) satisfies the condition: 10mm≤a≤15mm; and it holds that: 0.033≤b / a≤2.

Description

Technical area

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

[0002] During a battery thermal runaway, a large amount of mixed gas is produced and pressure builds up continuously. Installing a safety valve on a battery cell can relieve the pressure and prevent explosions.

[0003] In a related technology, after stacking several battery cells to form a battery pack, a flexible printed circuit board (FPC) is attached to the side of the battery cell where the terminals are located. The FPC can record and monitor battery voltage, temperature, and other data. Covering the safety valve with the FPC prevents the entire rupture disc from being ejected. The FPC also blocks the escape of thermally permeable gases, thus hindering the diffusion of the high-temperature medium. Content of the utility model

[0004] In light of this, the present application provides a battery assembly and battery pack to solve the problem that FPC cannot meet the diffusion requirements of high-temperature media while simultaneously preventing the burst disc from flying out.

[0005] In a first aspect, the present application provides a battery assembly comprising the following: A battery cell comprising a housing, the housing being provided with a safety valve; wherein a side of the housing being provided with the safety valve is defined as the first surface and the safety valve comprises an open weakening zone, the weakening zone being designed to allow pressure relief of the battery cell by tearing open the weakening zone; and a residual section located within the open portion of the weakening zone, the weakening zone and the residual section together enclosing a continuous closed annular contour; wherein, along a direction perpendicular to the first surface, the thickness of the residual section is greater than the thickness of the weakening zone; a wiring harness panel, wherein the wiring harness panel comprises an information acquisition component designed to acquire the battery temperature and / or voltage of at least one battery cell; and located on the side of the battery cell that is provided with the safety valve; wherein the wiring harness panel has a slot section extending through the top and bottom of the wiring harness panel and forming a slot; wherein a projection of the slot section towards the first surface at least partially overlaps with the safety valve; Where the dimension of the remaining section is defined as a, the width of the slot section is defined as b along the width direction of the slot section, and the dimension of the safety 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 section, if the slot section is too wide, the wiring harness plate shrinks after combustion by the high-temperature medium, causing the slot section to enlarge further and the rupture disc to potentially fly out; if the slot section is too narrow, it may prevent the rupture disc from flying out, but it hinders the diffusion of the high-temperature medium and the rapid opening of the safety valve.

[0007] By limiting the dimension a of the remaining section along the width direction of the slot section, if the remaining section is too small, it has less contact with other areas of the housing or cover plate, and the rupture disc can easily be torn off the remaining section after force is applied, causing the rupture disc to fly out; if the remaining section is too large, the dimension of the intended weakening area is reduced accordingly, resulting in an opening area of ​​the safety valve that is too small and not conducive to the rapid diffusion of the high-temperature medium.

[0008] By limiting the ratio range between the width b of the slot section and the dimension a of the remaining section, a ratio that is too large means that the slot section is too wide and the remaining section too short, and the rupture disc can easily fly out; a ratio that is too small means that the slot section is too narrow and the remaining section too long, which is not conducive to the diffusion of the high-temperature medium.

[0009] In a second aspect, the present application also provides a battery pack comprising: a battery assembly as described above; a base plate, wherein the battery cells are placed on the base plate and the wiring harness plate is arranged on a side of the battery cells facing away from the base plate.

[0010] Since the battery pack comprises the battery assembly and has the same beneficial effects as the battery assembly, details are not repeated here. Figures

[0011] To illustrate the technical solutions in the specific embodiments or the prior art of the present application more clearly, the accompanying drawings, which must be used in describing the specific embodiments or the prior art, are briefly presented below. It is evident that the accompanying drawings represent some of the embodiments of the present application in the following description, and that other drawings can be obtained by general technical personnel in this field, provided they are not performing any creative work, based on the accompanying drawings. Fig. Figure 1 is a schematic exploded view of the battery assembly of the present application; Fig.Figure 2 is a schematic representation of the connection state of the battery cell and the wiring harness plate of the present application; Fig. 3 is a top view of the connection state of the battery cell and the wiring harness plate of the present application; Fig. 4 is a partially enlarged view of the wiring harness panel of the present application; Fig. Figure 5 is a cross-sectional view of the battery cell of the present application; Fig. 6 is a partially enlarged view (I) of Fig. 5; Fig. 7 is a partially enlarged view (II) of Fig. 5; Fig. Figure 8 is a cross-sectional view showing an insulating cover plate between the battery cell and the wiring harness plate of the present application; Fig. Figure 9 is a schematic representation of the cover plate of the present application; Fig.10 is a schematic representation (I) of the protective patch of the present application; Fig. 11 is a schematic representation (II) of the protective patch of the present application; Fig. 12 is a schematic representation of the interior of the cable harness panel of the present application; Fig. Figure 13 is a schematic representation (I) of the positional relationship between the battery cell and the slot section of the present application; Fig. Figure 14 is a schematic representation (II) of the positional relationship between the battery cell and the slot section of the present application; Fig. 15 is a schematic representation (III) of the positional relationship between the battery cell and the slot section of the present application; Fig.16 is a schematic representation (IV) of the positional relationship between the battery cell and the slot section of the present application; Fig. 17 is a schematic representation (V) of the positional relationship between the battery cell and the slot section of the present application; Fig. 18 is a schematic representation (I) illustrating the case in which the longitudinal direction of the residual sections of several adjacent battery cells runs parallel to the longitudinal direction of the first surface; Fig. 19 is a schematic representation (I) illustrating the case in which the longitudinal direction of the residual sections of two adjacent battery cells runs parallel to the lateral direction of the first surface; Fig.Figure 20 is a schematic representation (II) illustrating the case in which the longitudinal direction of the residual sections of two adjacent battery cells runs parallel to the longitudinal direction of the first surface; Fig. Figure 21 is a schematic representation (III) illustrating the case in which the longitudinal direction of the residual sections of two adjacent battery cells runs parallel to the latitude direction of the first surface. Reference symbols in the figures:

[0012] 1. Wiring harness plate; 10. Wiring harness plate body; 11. Slotted section; 12. Collecting branch; 13. Cutting slot; 14. Fuse; 15. Protective film; 16. Cell body conductor wire; 17. Spacer section; 2. Cell row; 3. Battery cell; 31. Safety valve; 311. Remaining section; 312. Target weakening area; 32. Support section; 321. Gas guide groove; 33. Cover plate; 331. Filling opening; 34. Terminal column; 35. Housing; 4. Insulating cover plate; 5. Protective patch; 51. Notch; 52. Cantilever section; 501. First endpoint; 502. Second endpoint; 6. Gap section. Specific embodiments

[0013] To clarify the purpose, technical solutions, and advantages of the embodiments of the present application, the technical solutions of the embodiments of the present application are described clearly and completely below with reference to the figures of the embodiments of the present application. The described embodiments naturally represent only a part of the present application and do not constitute the entirety of all embodiments. Based on the embodiments of the present application, all further embodiments that a person skilled in the art obtains without creative activity fall within the scope of protection of the present application.

[0014] In the description of this application, it should be understood that azimuth or positional relationships referring to the terms "center," "top," "bottom," "left," "right," "vertical," "horizontal," "inside," "outside," etc., are azimuth or positional relationships based on the figures. They are intended to facilitate and simplify the description of this application, rather than indicating or implying that the device or component in question must have a specific orientation, be constructed in a specific orientation, or be operated in a specific orientation. Therefore, they should not be understood as limiting the scope of this application. Furthermore, the terms "first," "second," and "third" are used only for differentiation and should not be understood as indicating a relative meaning.

[0015] It should be noted that in the description of this application, the terms "install," "connect," and "link" are to be understood in a broad sense unless expressly stated otherwise or limited. For example, it may be a permanent connection, a detachable connection, or a connection in one piece; it may be a mechanical connection or an electrical connection; it may be a direct connection, an indirect connection via an intermediate medium, or a connection within the two elements. For general technical personnel in this field, the specific meaning of the above terms in this application may be understood according to the specific circumstances.

[0016] Furthermore, the technical features of the various embodiments of the present application, which are described below, can be combined with each other as long as they do not conflict with each other.

[0017] To clearly describe the positional relationship of different structures in the embodiments of the present application, the directions and orientations are first defined. The side of the housing 35 on which the safety valve 31 is located is the first surface, the longitudinal direction of the slot section 11 is the first direction, and the lateral direction of the slot section 11 is the second direction, the first direction and the second direction being perpendicular to each other.

[0018] It should be noted that the longitudinal direction of slot section 11 is the first direction, wherein the longitudinal direction of slot section 11 refers to the longitudinal direction of the slot running from top to bottom through the wiring harness plate; the lateral direction of slot section 11 is the second direction, wherein the lateral direction of slot section 11 refers to the lateral direction of the slot running from top to bottom through the wiring harness plate; wherein the longitudinal direction of the slot running from top to bottom through the wiring harness plate is greater than the lateral direction of the slot running from top to bottom through the wiring harness plate.

[0019] The following are examples of the implementation of the present application with reference to the Fig. 1 to 21 described.

[0020] According to the embodiments of the present application, in the first aspect a battery assembly is provided which comprises the following: a battery cell 3 comprising a housing 35, the housing 35 being provided with a safety valve 31; wherein a side of the housing 35, which is provided with the safety valve 31, is defined as the first surface and the safety valve 31 comprises an open weakening area 312, the weakening area 312 being designed to allow pressure relief of the battery cell 3 by tearing open the weakening area 312; and a residual section 311 located in the open area of ​​the weakening area 312, the weakening area 312 and the residual section 311 together enclosing a continuous closed annular contour; wherein, along a direction perpendicular to the first surface, the thickness of the residual section 311 is greater than the thickness of the weakening area 312; a wiring harness panel 1, wherein the wiring harness panel 1 comprises an information acquisition component designed to acquire the battery temperature and / or voltage of at least one battery cell 3, and located on the side of the battery cell 3 that is provided with the safety valve 31; wherein the wiring harness panel 1 has a slot section 11 extending through the top and bottom surfaces of the wiring harness panel 1 and forming a slot; wherein a projection of the slot section 11 overlaps at least partially with the safety valve 31 in the direction of the first surface; wherein the two ends of the target weakening area 312 form a first end section and a second end section, and the area between the first end section and the second end section of the target weakening area 312 forms the residual section 311, wherein the straight-line distance between the first end section and the second end section is defined as dimension a of the residual section 311, along the width direction of the slot section 11 the width of the slot section 11 is defined as b and the dimension of the safety valve 31 is defined as c, wherein: c > b and 0.01 ≤ b / a ≤ 12; By arranging the predetermined weakening area 312, the safety valve 31 explodes along the path of the predetermined weakening area 312 to release gas in the event of thermal runaway in the battery cell 3. Furthermore, a residual section 311 is provided, and along a direction perpendicular to the plane in which the safety valve 31 is located, the thickness of the residual section 311 is greater than the thickness of the predetermined weakening area 312. This ensures that when the safety valve 31 explodes along the path of the predetermined weakening area 312, the residual section 311 remains held in place and connected to other areas of the housing or cover plate, thus preventing the entire rupture disc from being ejected.

[0021] The wiring harness plate 1 is located on the side of the battery cell 3 which is equipped with the safety valve 31, so that the wiring harness plate 1 can be pressed onto the safety valve 31 and also helps to prevent the burst disc from flying out.

[0022] Simultaneously, the wiring harness panel 1 is provided with a slot section 11, the projection of which at least partially overlaps the intended weakening area 312 in the direction of the battery cell 3. This prevents interference with the smooth opening of the safety valve 31 while simultaneously ensuring smooth venting after the safety valve 31 has opened. Since the wiring harness panel 1 is a sheet metal structure, the top of the wiring harness panel 1 refers to the side of the panel facing away from the battery cell 3, and the bottom of the wiring harness panel 1 refers to the side facing the battery cell 3. Slots are formed through the top and bottom of the wiring harness panel 1, which in turn form a slot section 11.

[0023] Advantageous effects: By limiting the width b of the slot section 11, if the slot section 11 is too wide, the wiring harness plate 1 shrinks after combustion by the high-temperature medium, causing the slot section 11 to enlarge further and the rupture disc to potentially eject; if the slot section 11 is too narrow, it may prevent the rupture disc from ejecting, but it hinders the diffusion of the high-temperature medium and the rapid opening of the safety valve.

[0024] By limiting the dimension a of the residual section 311 along the width direction of the slot section 11, the residual section 311, if its dimension is too small, has less contact with other areas of the housing or cover plate, and the rupture disc can easily be torn off the residual section 311 after the application of force, causing the rupture disc to fly out; if the dimension of the residual section 311 is too large, the dimension of the intended weakening area 312 is reduced accordingly, resulting in an opening area of ​​the safety valve 31 that is too small and not conducive to the rapid diffusion of the high-temperature medium.

[0025] The safety valve 31 comprises an open weakening zone 312 and a residual section 311 located within the open weakening zone 312, wherein the weakening zone 312 and the residual section 311 together enclose a continuous closed annular contour. The continuous closed annular contour can be, for example, a raceway contour, an elliptical contour, a rectangular contour, or the like. In one embodiment, the safety valve 31 has multiple interrupted weakening zones 312, with residual sections 311 arranged between adjacent weakening zones 312; the multiple weakening zones 312 and the multiple residual sections 311 together enclose a continuous closed annular contour. If the continuous closed annular contour is, for example, a raceway contour, the formation path of the multiple weakening zones 312 coincides with the raceway contour.

[0026] In a further embodiment, the safety valve 31 comprises a continuous weakening zone 312. The two ends of the weakening zone 312 form a first end section and a second end section. The area between the first end section and the second end section of the weakening zone 312 forms a residual section 311. The weakening zone 312 and the residual section 311 together enclose a continuous closed ring contour. If we take the closed ring contour as the raceway contour as an example, the formation path of the weakening zone 312 coincides with the raceway contour, but the formation path of the residual section 311 is a straight line.

[0027] Since the target weakening area 312 is formed by locally thinning the first surface of the housing 35, the two can be better combined to form a continuous closed ring contour to ensure that the target weakening area 312 and the remaining section 311 together enclose a continuous closed ring contour.

[0028] It should be noted that the dimension a of the remaining section 311 refers to the distance between the first end section and the second end section. As in Fig. As shown in Figure 13, the remaining section 311 is linear and the length of the remaining section 311 along the second direction is the dimension a of the remaining section 311.

[0029] By limiting the ratio range between the width b of the slot section 11 and the dimension a of the remaining section 311, a ratio that is too large means that the slot section 11 is too wide and the remaining section 311 is too short, and the rupture disc can easily fly out; a ratio that is too small means that the slot section 11 is too narrow and the remaining section 311 is too long, which is not conducive to the diffusion of the high-temperature medium.

[0030] The wiring harness plate 1 can extend along a first direction or a second direction, where both the first direction and the second direction can be the directions shown in the figures. In this embodiment, the longitudinal direction of the slot section 11 runs parallel to the longitudinal direction of the wiring harness plate 1.

[0031] As an alternative, the longitudinal direction of the slot section 11 can also run perpendicular to the longitudinal direction of the cable harness panel 1. That is, if, for example, the longitudinal direction of the cable harness panel 1 runs parallel to the first direction, the longitudinal direction of the slot section 11 can run parallel to the second direction. If the battery assembly comprises several battery cells 3, several slot sections 11 can be provided, each slot section 11 corresponding to the safety valve of a battery cell 3. The multiple slot sections 11 all run parallel to the second direction and are spaced apart. In this embodiment, the length of the target weakening range 312 is 20 mm to 120 mm. For example, the length of the target weakening range 312 can be 20 mm, 40 mm, 50 mm, 60 mm, 75 mm, 85 mm, 100 mm, or 120 mm, or an interval range formed by any two of the above values.It should be noted that the length of the target weakening area 312 refers in particular to the distance between the first end section and the second end section of the target weakening area 312 along the formation path of the target weakening area 312.

[0032] In this embodiment, the dimension a of the remaining section 311 lies in the range of 5 mm to 50 mm. It can, for example, be 5 mm, 15 mm, 20 mm, 30 mm, 35 mm, 45 mm or 50 mm, or be an interval range formed by any two of the above-mentioned values.

[0033] In this embodiment, the width b of the slot section 11 is in the range of 0.5 mm to 60 mm. It can, for example, be 0.5 mm, 1 mm, 1.5 mm, 3.5 mm, 5 mm, 15 mm, 20 mm, 30 mm, 35 mm, 45 mm, 50 mm, or 60 mm, or be an interval range formed by any two of the above values.

[0034] In this embodiment, the range of values ​​for b / a is 0.01 ≤ b / a ≤ 12. For example, the specific value of b / a can be 0.01 or 0.1 or 0.2 or 0.5 or 1 or 1.5 or 2.2 or 3 or 5 or 7 or 9 or 11 or 12, or it can be the interval range formed by any two of the above values.

[0035] To verify the valve opening performance of the safety valve 31, the valve opening performance is verified using several sets of embodiments and comparative examples. In the embodiment of the present application, the valve opening performance of the safety valve 31 must meet the following conditions to pass the test: 1. The valve opening time Δt (expressed in s) must be less than 60 s; 2. The probability (expressed in %) that the valve opens below the preset valve opening pressure must be greater than 55%; 3. The probability (expressed in %) that the entire rupture disc is ejected must be less than 30%.

[0036] The present application does not restrict the specific test procedure for the valve opening performance of the safety valve 31, and those skilled in the art can test the valve opening performance of the safety valve 31 using conventional technical means.

[0037] For example, the opening behavior of the safety valve 31 can be tested using the following procedure: Selecting 100 battery cells 3, wherein the selected battery cells 3 do not require an arrangement of cells but merely have a housing 35 (where the housing 35 comprises a cover plate 33 and the cover plate 33 comprises a safety valve 31), inflating the housing 35 with gas under a fixed clamping force of 5000 N, monitoring the gas pressure in the housing 35 and Maintain pressure until a predetermined pressure is reached (e.g., the predetermined opening pressure of safety valve 31 of -0.01 MPa), and observe whether the valve opens at this pressure, and record the following data: ① Time from reaching the predetermined pressure until the actual opening of the safety valve 31, i.e. the valve opening time Δt; 2. Counting the probability that the safety valve 31 opens under the predetermined pressure, wherein the probability that the safety valve 31 opens under the predetermined pressure is obtained by dividing the actual number of valve openings by 100. ③ Observe whether the entire rupture disc ejects and count the probability that the entire rupture disc ejects, where the probability that the entire rupture disc ejects is obtained by dividing the actual number of batteries when the entire rupture disc ejects by 100.

[0038] Based on actual tests, the present application is explained in more detail below using specific examples in conjunction with Table 1: Table 1 Width b of the slot section Dimension a of the remaining section b / a Valve opening time Δt (s) Probability of valve opening at set valve opening pressure (%) Probability of the burst disc completely ejecting (%) Example 1 9,5 38 0,25 20 84 0 Example 2 48 5 9,6 12 97 7 Example 3 11 35 0,31 18 89 0 Example 4 45 10 4,5 16 95 4 Example 5 35 7 5 13 96 5 Example 6 10 20 0,5 18 91 3 Example 7 7 25 0,28 27 81 2 Example 8 55 30 1,83 25 83 1 Example 9 10 4 2,5 15 95 12 Example 10 35 45 0,78 33 75 0 Example 11 10 41 0,24 38 69 0 Example 12 50 4,5 11 13 95 18 Example 13 1,7 45 0,04 49 60 0 Example 14 47 4 11,75 10 97 21 Example 15 0,4 35 0,01 60 55 0 Example 16 45 4 11,25 11 97 21 Comparative example 1 0,4 50 0,008 78 42 0 Comparative example 2 58 4,5 12,89 11 96 35

[0039] In embodiments 1 to 6, the values ​​of the width b of the slot section 11 are all within the optional range, i.e., the optional range of the width b of the slot section 11 fulfills the condition: 10 mm ≤ b ≤ 50 mm; the values ​​of the dimension a of the remaining section 311 are all within the optional range, i.e., the optional range of the dimension a of the remaining section 311 fulfills the condition: 5 mm ≤ a ≤ 40 mm; at the same time, the values ​​of b / a are also within the optional range, i.e., the optional range of b / a fulfills the condition: 0.25 ≤ a ≤ 10. After testing, the valve opening performance of the safety valve 31 can meet the following requirements: 1. The valve opening time Δt (specified in s) is less than 20 s; 2. The probability (expressed in %) that the valve will open below the preset valve opening pressure is greater than 84%; 3.The probability (expressed as a percentage) that the entire rupture disc will eject is less than 10%. The safety valve 31 exhibits excellent valve opening performance.

[0040] In embodiments 7 to 10, the values ​​of b / a are within the optional range compared to embodiments 1 to 6; that is, the optional range of b / a satisfies the condition: 0.25 ≤ b / a ≤ 10. However, the values ​​of the width b of the slot section 11 and the values ​​of the dimension a of the remaining section 311 are within the upper and lower limits, but not all are within the optional range. After testing, the valve opening performance of the safety valve 31 can meet the following requirements: 1. The valve opening time Δt (expressed in s) is less than 35 s; 2. The probability (expressed in %) that the valve opens below the preset valve opening pressure is greater than 70%; 3. The probability (expressed in %) that the entire rupture disc is ejected is less than 15%. The safety valve 31 exhibits good valve opening performance.

[0041] In embodiments 11 to 12, the values ​​of the width b of the slot section 11 are all within the optional range compared to embodiments 1 to 6, i.e., the optional range of the width b of the slot section 11 meets the condition: 10 mm ≤ b ≤ 50 mm; the values ​​of the dimension a of the remaining section 311 are all within the optional range, i.e., the optional range of the dimension a of the remaining section 311 meets the condition: 5 mm ≤ a ≤ 40 mm; the values ​​of b / a are within the upper and lower limits, but not all are within the optional range. After testing, the valve opening performance of the safety valve 31 can meet the following requirements: 1. The valve opening time Δt (specified in s) is less than 40 s; 2. The probability (expressed in %) that the valve will open below the preset valve opening pressure is greater than 65%; 3.The probability (expressed as a percentage) that the entire rupture disc will eject is less than 20%. The safety valve 31 exhibits good valve opening performance.

[0042] In embodiments 13 to 14, the values ​​of the width b of the slot section 11 and the values ​​of the dimension a of the remaining section 311 are within the upper and lower limits compared to embodiments 1 to 6, but not all are within the optional range of values. Simultaneously, the values ​​of b / a are within the upper and lower limits, but not all are within the optional range of values. After testing, the valve opening performance of the safety valve 31 can meet the following requirements: 1. The valve opening time Δt (specified in s) is less than 50 s; 2. The probability (specified in %) that the valve opens below the preset valve opening pressure is greater than 60%; 3. The probability (specified in %) that the entire rupture disc is ejected is less than 25%. The safety valve 31 exhibits sufficient valve opening performance.

[0043] In embodiments 15 to 16, the values ​​of the width b of the slot section 11 and the values ​​of the dimension a of the remaining section 311 are outside the upper and lower limits compared to embodiments 1 to 6, while the values ​​of b / a are within the upper and lower limits, but not all are within the optional range of values. After testing, the valve opening performance of the safety valve 31 can meet the following requirements: 1. The valve opening time Δt (specified in s) is less than 60 s; 2. The probability (specified in %) that the valve opens below the preset valve opening pressure is greater than 55%; 3. The probability (specified in %) that the entire rupture disc is ejected is less than 30%. The safety valve 31 can only meet the minimum requirements for valve opening performance and pass the test.

[0044] In comparison examples 1 and 2, the values ​​of the width b of slot section 11 and the values ​​of the dimension a of the remaining section 311 are outside the upper and lower limits, and the values ​​of b / a are also outside the upper and lower limits. After testing, the valve opening performance of the safety valve 31 can meet the following requirements: 1. The valve opening time Δt (expressed in s) is greater than 60 s; 2. The probability (expressed in %) that the valve opens below the preset valve opening pressure is less than 55%; 3. The probability (expressed in %) that the entire rupture disc is ejected is greater than 30%. The safety valve 31 cannot meet the minimum requirements for valve opening performance and fails the test.

[0045] In some embodiments, the optional area of ​​width b of the slot section 11 along the width direction of the slot section 11 satisfies the condition: 10 mm ≤ b ≤ 50 mm; the optional area of ​​dimension a of the remaining section 311 satisfies the condition: 5 mm ≤ a ≤ 40 mm;

[0046] Furthermore, the optional range of b / a satisfies the condition: 0.25 ≤ b / a ≤ 10. In some embodiments, such as in Fig. As shown in Figure 13, the projection of the slot section 11 onto the plane on which the first surface is located overlaps at least partially with the remaining section 311; along the width direction of the slot section 11, the optional region of width b of the slot section 11 satisfies the condition: 10 mm ≤ b ≤ 50 mm; the optional region of b / a satisfies the condition: 0.25 ≤ b / a ≤ 10.

[0047] If the projection of slot section 11 towards battery cell 3 overlaps at least partially with the remaining section 311, no high-temperature medium escapes directly towards slot section 11, because the valve in the area corresponding to the remaining section 311 does not open, thus slowing the expansion rate of the slot. To ensure uniform diffusion of the high-temperature medium, the width of slot section 11 should be correspondingly larger and the dimensions of the remaining section 311 correspondingly smaller to allow for rapid escape of the high-temperature medium.

[0048] In this embodiment, the width b of the slot section 11 can be 10 mm, 15 mm, 20 mm, 30 mm, 35 mm, 45 mm or 50 mm, or an interval range formed by any two of the above values.

[0049] In other embodiments, such as in Fig.As shown in Figure 14, the projection of the slot section 11 towards the first surface completely covers the remaining section 311; along the width direction of the slot section 11, the width b of the slot section 11 satisfies the condition: 2mm≤b≤10mm; and the condition: 0.2≤b / a≤2.

[0050] Since the projection of slot section 11 towards battery cell 3 completely covers the remaining section 311, i.e., when slot section 11 and remaining section 311 are completely opposite each other, no high-temperature medium will escape directly towards slot section 11 because the valve does not open in the area corresponding to remaining section 311. Therefore, the expansion rate of the slot is even lower here than when the projection of slot section 11 towards battery cell 3 at least partially overlaps with remaining section 311. To ensure uniform diffusion of the high-temperature medium, the width of slot section 11 should be correspondingly larger and the dimension of remaining section 311 correspondingly smaller.

[0051] In this embodiment, the width b of the slot section 11 can be 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 8 mm or 10 mm, or an interval range formed by any two of the above values.

[0052] In other embodiments, such as in Fig. 15, Fig. 16 or Fig. As shown in Figure 17, the projection of the slot section 11 towards the first surface does not overlap with the remaining section 311; along the width direction of the slot section 11, the width b of the slot section 11 satisfies the condition: 0.5 mm ≤ b ≤ 20 mm; and the condition: 0.012≤b / a≤4.

[0053] Since the projection of slot section 11 towards the first surface does not overlap with the remaining section 311, i.e., slot section 11 does not correspond to the remaining section 311, but rather slot section 11 corresponds to the intended weakening area 312 of the safety valve 31, the high-temperature medium bursts directly onto slot section 11 at this point, thus enabling its rapid diffusion. Here, the expansion rate of the slot is relatively high, allowing the width of slot section 11 to be reduced accordingly. However, since slot section 11 continues to expand after the burst of the high-temperature medium, the load on the rupture disc through slot section 11 decreases.To prevent the remaining section 311 from being torn off after a force is applied to the rupture disc, which could cause the rupture disc to fly out, the dimensions of the remaining section 311 can be increased accordingly, which helps to prevent the entire rupture disc from flying out.

[0054] In this embodiment example, the width b of the slot section 11 can be 0.5 mm or 1 mm or 2 mm or 3 mm or 4 mm or 5 mm or 6 mm or 8 mm or 10 mm or 13 mm or 16 mm or 20 mm, or be an interval range formed by any two of the above values.

[0055] In some embodiments, such as in Fig.As shown in Figure 12, the longitudinal direction of the slot section 11 runs parallel to the longitudinal direction of the cable harness plate 1, and along the width direction of the slot section 11 the slot section 11 is located in the center position of the cable harness plate 1, and the projection of the slot section 11 towards the first surface overlaps with the center position of the safety valve 31.

[0056] Since several cell body conductor wires 16 are provided in the cable harness plate 1, the number of branches of the cell body conductor wires 16 provided for the positive and negative pole columns is generally the same, and no wires are laid at the position of the slot section 11.

[0057] By arranging the slot section 11 in the central position of the cable harness plate 1, the width of the cable harness plate 1 is made equal on both sides of the slot section 11 along the width direction, so that the number of branches of the cell body conductor wires 16 distributed on both sides of the slot section 11 along the width direction is more uniform, which is more conducive to the arrangement of the cable harness.

[0058] Simultaneously, the projection of the slot section 11 towards the first surface overlaps with the central position of the safety valve 31. This ensures that the slot section 11 and the safety valve 31 are directly opposite each other, guaranteeing a uniform discharge after the opening of the safety valve 31 and thus resulting in a more effective discharge. As shown in Fig.As shown in Figure 2, the longitudinal direction of the slot section 11 runs parallel to the longitudinal direction of the cable harness plate 1, i.e., the cable harness plate 1 also extends along the first direction, with the width direction of the slot section 11 running parallel to the second direction.

[0059] In other embodiments, such as in Fig. As shown in Figure 4, the longitudinal direction of the slot section 11 runs parallel to the longitudinal direction of the cable harness plate 1, and along the width direction of the slot section 11 the vertical distance between the edge of the side of the slot section 11 facing the center line of the cable harness plate 1 and the center line of the cable harness plate 1 is d and satisfies the condition: 0.5mm≤d≤20mm.

[0060] If the longitudinal direction of the slot section 11 is parallel to the longitudinal direction of the cable harness panel 1 and there is a distance d between the slot section 11 and the center line of the cable harness panel 1 along the width direction of the slot section 11, i.e., the widths of the cable harness panel 1 on both sides of the slot section 11 along the width direction are not equal, but one side is larger and the other side is smaller.

[0061] If the vertical distance d between the edge of the side of the slot section 11 facing the centerline of the cable harness panel 1 and the centerline of the cable harness panel 1 is large, the number of branches of the cell body conductor wire 16 distributed along the width direction on both sides of the slot section 11 is uneven, since no wires are routed at the position of the slot section 11, with the number of cable harnesses being greater and more concentrated on the side with the wider cable harness panel 1, while the number of cable harnesses is lower on the side with the narrower cable harness panel 1, thus ensuring that the effects of the safety valve opening on the cable harnesses are reduced.

[0062] If the vertical distance d between the edge of the side of the slot section 11 facing the centerline of the cable harness plate 1 and the centerline of the cable harness plate 1 is small, the number of branches of the cell body conductor wire 16 distributed along the width direction on both sides of the slot section 11 is more uniform, which is advantageous for the arrangement of the cable harness. The slot section 11 is expediently located directly opposite the safety valve 31 so that a uniform ejection after the opening of the safety valve 31 is ensured and a better breakout effect is achieved.

[0063] In this embodiment, the value of d can be 0.5 mm or 1 mm or 2 mm or 3 mm or 4 mm or 5 mm or 6 mm or 8 mm or 10 mm or 13 mm or 16 mm or 20 mm, or it can be an interval range formed from any two of the above values.

[0064] In some embodiments, such as in Fig. 13 or Fig. As shown in Figure 15, the longitudinal direction of the safety valve 31 runs parallel to the longitudinal direction of the first surface, the longitudinal direction of the slot section 11 runs perpendicular to the longitudinal direction of the remaining section 311 and satisfies the condition: 1 mm ≤ b ≤ 60 mm.

[0065] In this embodiment, the width b of the slot section 11 can 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 be an interval range formed by any two of the above values.

[0066] In some embodiments, such as in Fig.As shown in Figure 17, the longitudinal direction of the safety valve 31 runs parallel to the thickness direction of the battery cell 3, the longitudinal direction of the slot section 11 runs parallel to the longitudinal direction of the remaining section 311 and fulfills the condition: 0.5 mm ≤b ≤ 40 mm.

[0067] In this embodiment, the width b of the slot section 11 can be 0.5 mm or 1 mm or 2 mm or 3 mm or 4 mm or 5 mm or 6 mm or 8 mm or 10 mm or 13 mm or 16 mm or 20 mm or 26 mm or 30 mm or 32 mm or 37 mm or 40 mm, or an interval range formed by any two of the above values.

[0068] For the sake of simplicity, the safety valve 31 is described as being arranged horizontally if the longitudinal direction of the safety valve 31 is parallel to the longitudinal direction of the first surface; and the safety valve 31 is described as being arranged vertically if the longitudinal direction of the safety valve 31 is parallel to the thickness direction of the battery cell 3.

[0069] The valve opening pressure is lower when the safety valve 31 is arranged horizontally than when it is arranged vertically. This is because the pull through the cover plate 33 decreases the further the edge of the safety valve 31 is from the edge of the cover plate 33, making the valve easier to open. When the safety valve 31 is arranged vertically, the distance between its longitudinal side and the cover plate 33 is too small, requiring a higher valve opening pressure. Therefore, when the safety valve 31 is arranged horizontally, the width b of the slot section 11 should be wider, and in this case, b should be within a more optional range. Conversely, when the safety valve 31 is arranged vertically, the width b of the slot section 11 must be set narrower.

[0070] In some embodiments, such as in Fig.As shown in Figure 19, the multiple battery cells 3 are stacked to form a cell row 2, and the longitudinal direction of the residual section 311 runs parallel to the longitudinal direction of the first surface; along the transverse direction of the first surface, the residual sections 311 of the safety valves 31 of two adjacent battery cells 3 are arranged apart from each other;

[0071] The longitudinal direction of slot section 11 runs parallel to the width direction of the first surface and along the width direction of slot section 11 the width b of slot section 11 satisfies the condition: 0.5mm≤b≤50mm;.

[0072] Along the longitudinal direction of the first surface, the residual sections 311 of the safety valves 31 of two adjacent battery cells 3 are arranged apart from one another, and the longitudinal direction of the slot section 11 runs parallel to the lateral direction of the first surface. Therefore, when the safety valves 31 of two adjacent battery cells 3 open simultaneously, the rupture discs lift the wiring harness panels 1 on both sides of the slot section 11, thereby accelerating the expansion of the slot section 11. This allows the width of the slot section 11 to be chosen to be smaller in order to avoid a momentary heat build-up during valve opening and burning of the wiring harness panel 1, and the resulting increased width of the slot section 11 does not impede the discharge of the high-temperature medium.

[0073] In this embodiment, the width b of the slot section 11 can be 0.5 mm or 1 mm or 2 mm or 3 mm or 4 mm or 5 mm or 6 mm or 8 mm or 10 mm or 13 mm or 16 mm or 20 mm or 26 mm or 30 mm or 32 mm or 37 mm or 40 mm or 45 mm or 48 mm or 50 mm or be an interval range formed by any two of the above values.

[0074] In this embodiment, the thickness of the cable harness plate 1 in a direction perpendicular to the plane on which the cable harness plate 1 is located is f and satisfies the condition: 140 micrometers ≤ f ≤ 185 micrometers.

[0075] Since the remaining sections 311 of the safety valves 31 of two adjacent battery cells 3 are arranged apart from each other, the slot section 11 in the area between the two safety valves 31 is heated more, the heat builds up faster, the expansion rate of the slot of the slot section 11 is accelerated and the thickness of the cable harness plate 1 can be greater.

[0076] In some other embodiments, such as in Fig. 20 and Fig. As shown in Figure 21, several battery cells 3 are stacked to form a battery row 2. Based on the current placement of the battery cells 3, the residual sections 311 of the safety valves 31 of two adjacent battery cells 3 are located in the same position on the first surface;

[0077] The longitudinal direction of the slot section 11 runs parallel to the width direction of the first surface and along the width direction of the slot section 11 the width b of the slot section 11 satisfies the condition: 1mm≤b≤60mm.

[0078] It should be noted that the residual section of each individual battery cell 3 is located in the same position on the first surface. However, depending on the requirements for the series and parallel connection of the battery array, the battery cells 3 are oriented differently, i.e., the pole columns of the battery cells 3 point in different directions. In this embodiment, based on the current placement positions of the battery cells 3, the residual sections 311 of the safety valves 31 of two adjacent battery cells 3 are located in the same position on the first surface.

[0079] Since the residual sections 311 of the safety valves 31 of two adjacent battery cells 3 are arranged at the same location on the first surface, the rupture disc, when the safety valves 31 of two adjacent battery cells 3 open simultaneously, directs the injection direction of the high-temperature medium, as the residual sections 311 remain connected. The opening directions of the safety valves 31 of the two adjacent battery cells 3 are the same, so that the two adjacent battery cells 3 do not spray against each other, the heat does not concentrate, and the slot section 11 does not heat up and expand as easily. To avoid impeding the ejection of the high-temperature medium, the width of the slot section 11 can be chosen to be larger at this point to ensure that the high-temperature medium is ejected in a timely manner.Since the safety valves 31 of two adjacent battery cells 3 open in the same direction, there is no heat build-up due to the mutual impact of the high-temperature medium and the rupture disc is less likely to fly out, so that the dimension of the remaining section 311 can be chosen to be smaller.

[0080] In this embodiment, the width b of the slot section 11 can 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 be an interval range formed by any two of the above values.

[0081] In this embodiment, the thickness of the cable harness plate 1 in a direction perpendicular to the plane on which the cable harness plate 1 is located is f and satisfies the condition: 155 micrometers ≤ f ≤ 235 micrometers.

[0082] Since the safety valves 31 of two adjacent battery cells 3 have the same opening direction, heat build-up occurs between the opposite and mutually facing opening directions of the valves when the high-temperature medium escapes, so the thickness of the cable harness plate 1 must be chosen moderately.

[0083] In some other embodiments, such as in Fig. As shown in Figure 18, the multiple battery cells 3 are stacked to form a cell row 2, and the longitudinal direction of the residual section 311 runs parallel to the longitudinal direction of the first surface; along the transverse direction of the first surface, the residual section 311 of the safety valve 31 of one of the battery cells 3 is arranged facing the residual section 311 of the safety valve 31 of the battery cell 3 on one side and facing away from the residual section 311 of the safety valve 31 of the battery cell 3 on the other side; the longitudinal direction of the slot section 11 runs parallel to the width direction of the first surface and along the width direction of the slot section 11 the width b of the slot section (11) satisfies the condition: 1mm≤b≤50mm.

[0084] Along the width direction of the first surface, the residual section 311 of the safety valve 31 of one of the battery cells 3 is arranged facing the residual section 311 of the safety valve 31 of the battery cell 3 on one side and facing away from the residual section 311 of the safety valve 31 of the battery cell 3 on the other side; that is, when the safety valve 31 opens, the opening direction of the safety valve 31 of a battery cell 3 is opposite to the opening direction of the safety valve 31 of the battery cell 3 on one side and towards the opening direction of the safety valve 31 of the battery cell 3 on the other side.This means that when the safety valves 31 of several battery cells 3 are opened simultaneously, the burst disc directs the injection direction of the high-temperature medium, since the remaining sections 311 remain connected, so that the battery cell 3 and the battery cell 3 adjacent on one side are in a mutual spraying state, while it and the battery cell 3 adjacent on the other side are in a back-to-back spraying state.The two battery cells 3 in the mutual spray state exhibit concentrated heat, causing the slot of the slot section 11 to expand more rapidly. In this case, the width of the slot section 11 can be chosen to be smaller to prevent heat buildup when the valve opens and the wiring harness plate 1 from burning out quickly. This increases the width of the slot section 11 without impeding the discharge of the high-temperature medium. Conversely, the two battery cells 3 in the back-to-back spray state do not exhibit concentrated heat, so the slot section 11 does not heat up and expand as readily. Therefore, to avoid impeding the discharge of the high-temperature medium, the width of the slot section 11 can be chosen to be larger. By combining both values, the width b of the slot section 11 can be sensibly selected by choosing an intermediate value.

[0085] In this embodiment, the width b of the slot section 11 can 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 an interval range formed by any two of the above values.

[0086] In this embodiment, the thickness of the cable harness plate 1 in a direction perpendicular to the plane on which the cable harness plate 1 is located is f and satisfies the condition: 185 micrometers ≤ f ≤ 335 micrometers. Since the thickness f of the cable harness plate 1 must take both states into account, the value of f should also be moderate.

[0087] In some embodiments, such as in the Fig.As shown in Figures 5 to 8, the battery assembly comprises a cover plate 33, and the safety valve 31 is provided on the cover plate 33 and is located on the surface of a side of the cover plate 33 facing the wiring harness plate 1 or on the surface of a side facing away from the wiring harness plate 1; The cover plate 33 is also provided with a support section 32 on the outer circumferential side surrounding the safety valve 31, and the support section 32 extends towards the cable harness plate 1 and is designed to support the cable harness plate 1.

[0088] The cover plate 33 has a recess on the surface facing the wiring harness plate 1 or on the surface facing away from the wiring harness plate 1, which forms a mounting groove for the safety valve. By inserting the safety valve 31 into the mounting groove, it can be installed and secured; in particular, the safety valve 31 is firmly connected to the cover plate 33 by welding.

[0089] The area of ​​the cover plate 33 corresponding to the safety valve 31 provides a mounting opening for the safety valve, such that when the safety valve 31 opens along the path of the predetermined weakening zone 312, the mounting opening for the safety valve can accommodate the opening path of the safety valve 31. The path of the predetermined weakening zone 312 runs perpendicular to the plane of the cover plate 33 within the mounting opening of the safety valve. The mounting groove of the safety valve extends around the circumference of the mounting opening of the safety valve.

[0090] The cover plate 33 is also provided with a support section 32 on its outer circumferential side surrounding the safety valve 31. The support section 32 extends towards the wiring harness plate 1 and is designed to support the wiring harness plate 1. After the support section 32 supports the wiring harness plate 1, a gap remains between the wiring harness plate 1 and the safety valve 31, thus preventing the wiring harness plate 1 from adhering directly to the rupture disc and impeding its opening.

[0091] In this embodiment, the safety valve 31 is arranged on the surface of one side of the cover plate 33 facing away from the wiring harness plate 1, and the support section 32 is supported between the wiring harness plate 1 and the safety valve 31 to form a gap section 6 between the wiring harness plate 1 and the safety valve 31.

[0092] This means that the cover plate 33 is recessed on the surface of the side facing away from the wiring harness plate 1 to form a mounting groove for the safety valve, so that the safety valve 31 can be conveniently inserted into the mounting groove for the safety valve, so that the safety valve 31 and the support section 32 are each located on both sides of the cover plate 33, leaving more space between the wiring harness plate 1 and the safety valve 31, thus preventing the wiring harness plate 1 from adhering directly to the rupture disc and impairing its opening.

[0093] As one embodiment of the specific structure of the support section 32, the support section 32 is provided on both sides of the safety valve 31 in the longitudinal direction and extends along the width direction of the safety valve 31; and / or the support section 32 is provided on both sides of the width direction of the safety valve 31 and extends along the longitudinal direction of the safety valve 31.

[0094] By forming the support section 32 in strip form, it assumes a support function, creating a gap between the cable harness plate 1 and the safety valve 31, thus preventing the cable harness plate 1 from adhering directly to the burst disc and impairing its opening, thereby ensuring the smooth opening of the safety valve 31.

[0095] In a further embodiment of the specific structure of the support section 32, the support section 32 is arranged around the safety valve 31, so that a cavity is formed between the support section 32, the cable harness plate 1 and the safety valve 31.

[0096] By arranging the support section 32 around the safety valve 31, the cable harness plate 1 is prevented from adhering directly to the explosion-proof plate and obstructing its opening, thus ensuring smooth opening of the safety valve 31. Furthermore, by arranging the support section 32 around the circumferential edge of the mounting opening of the safety valve, the structure of the mounting opening of the safety valve can be reinforced, preventing the safety valve 31 from twisting and deforming due to the high welding heat during welding to the cover plate 33, thereby allowing precise control of the opening pressure of the safety valve 31.Furthermore, the formation of a cavity between the support section 32, the wiring harness plate 1, and the safety valve 31 facilitates the airtightness test of the safety valve 31, while simultaneously providing a gas storage space for the safety valve 31 after its deployment. In addition, in this embodiment, the support section 32 has a raceway contour to accommodate the structure of the mounting opening for the safety valve. With the raceway contour, the support area is large, there are no sharp corners around the perimeter, and if the slotted section is located in the center of the raceway contour, the support section 32 can provide uniform support to the wiring harness plate 1.

[0097] Alternatively, support section 32 can also be elliptical or rectangular.

[0098] In some embodiments, the support section 32 is made of plastic or metal.

[0099] In some embodiments, the support section 32 and the cover plate 33 are arranged separately.

[0100] Due to the separate arrangement of the support section 32 and the cover plate 33, the support section 32 can be easily disassembled and removed when the support section 32 is no longer needed.

[0101] In some other embodiments, the support section 32 and the cover plate 33 are integrally formed.

[0102] The integral design of the support section 32 and the cover plate 33 facilitates processing and shaping, improves the support effect, and prevents the support section 32 from shifting due to external forces during the support process. Simultaneously, the integral design of the support section 32 and the cover plate 33 also improves the strength of the cover plate 33 in the area of ​​the safety valve, making it less susceptible to deformation and ensuring precise control of the opening pressure of the safety valve 31.

[0103] In some embodiments, such as in Fig. As shown in Figure 6, the height h of the support section 32, which protrudes from the surface of one side of the cover plate 33 facing the cable harness plate 1 in a direction perpendicular to the plane of the cover plate 33, satisfies the conditions: 0.005≤h / b≤2.

[0104] The support section 32 is supported between the wiring harness plate 1 and the safety valve 31, creating a gap between the two. Perpendicular to the plane of the cover plate 33, the following applies: the greater the height of the support section 32 projecting from the surface of one side of the cover plate 33 facing the wiring harness plate 1, the larger the ventilation space of the gap, and the corresponding slot section 11 can be made smaller. At the same time, the height of the support section 32 projecting from the surface of one side of the cover plate 33 facing the wiring harness plate 1 should not be too great. If the support section 32 is too high or even exceeds the height of the top of the pole column, connecting the collector branch 12 to the pole column becomes impractical, as the collector branch 12 must bend downwards and, after grouping, occupies too much space in the Z-direction.If, however, the support section 32 is too short, the venting space in the gap section becomes smaller, which is not conducive to the escape of the high-temperature medium. Furthermore, the gap between the wiring harness plate 1 and the safety valve 31 is too small, which can easily lead to the rupture disc exploding.

[0105] In some other embodiments, the optional range of h / b can be selected as 0.01≤h / b≤2.

[0106] In some embodiments, such as in Fig. As shown in Figure 6, in a plane parallel to the plane on which the cover plate 33 is located, the distance between the surface of one side of the support section 32 facing the safety valve 31 and the surface of one side facing away from the safety valve 31 is defined as the thickness j of the support section 32 and satisfies the condition: 0.008≤j / b≤3.

[0107] In the plane parallel to the plane on which the cover plate 33 is located, the distance between the surface of one side of the support section 32 facing the safety valve 31 and the surface of one side facing away from the safety valve 31 is defined as follows: The greater the thickness of the support section 32, the larger the area of ​​the support section 32 used to support the cable harness plate 1, the more secure the cable harness plate 1; and the more the support section 32 surrounds the circumferential edge of the mounting opening of the safety valve, the greater the structural reinforcement effect on the mounting opening of the safety valve; the higher the strength of the cover plate near the safety valve 31, the more stable the valve opening pressure.The larger the valve opening threshold, the smaller the slot section 11 can be set, and consequently, the width of the cable harness plate 1 for routing is also greater. Furthermore, since the space of the cover plate 33 is limited, the support section 32 must not be too wide to avoid taking up too much space for other structural components. At the same time, the slot section 11 must not be too small to prevent the escape of the high-temperature medium.

[0108] In some embodiments, a protective patch 5 is provided between the slot section 11 and the safety valve 31, and the protective patch 5 is designed to prevent contaminants from reaching the safety valve 31, with the projection of the slot section 11 towards the first surface intersecting with the protective patch 5.

[0109] By placing a protective patch 5 between the slot section 11 and the safety valve 31 and overlapping the projection of the slot section 11 towards the first surface with the protective patch 5, it is possible to prevent contaminants such as dust from passing through the slot section 11 and falling onto the safety valve 31, in particular preventing conductive contaminants from falling onto the safety valve 31, thereby preventing corrosion or damage to the safety valve 31 and improving its safety performance.

[0110] In some embodiments, such as in Fig. As shown in Figure 8, the cable harness panel 1 comprises a cable harness panel body 10, where the thickness of the cable harness panel body 10 is defined as m, the thickness of the protective patch 5 is defined as k, and the following condition is met: 0.29 ≤ k / m ≤ 2.14.

[0111] Limiting the upper limit of the ratio between the thickness of the protective patch 5 and the thickness of the cable harness body 10 prevents the protective patch 5 from being too thick and the cable harness body 10 from being too thin. This would prevent the protective patch 5 from supporting the cable harness body 10, which could lead to uneven contact. Furthermore, if the protective patch 5 is too thick, it occupies the gap space provided between the cable harness panel 1 and the safety valve 31, thereby reducing the vent space for the breakout and impairing the release of the high-temperature medium.At the same time, by limiting the lower limit of the ratio of the thickness of the protective patch 5 to the thickness of the cable harness body 10, it can be prevented that the thickness of the protective patch 5 is too small and the thickness of the cable harness body 10 is too large, thus preventing the protective patch 5 from being too small, breaking easily and becoming ineffective and lacking a dustproof effect.

[0112] In some other embodiments, the optional range of k / m can be selected as 0.35≤k / m≤2.

[0113] In some embodiments, such as in Fig.As shown in Figure 6, the thickness of the protective patch 5 is defined as k and satisfies the condition: 0.0016 ≤ k / b ≤ 0.6. By limiting the lower bound of the ratio between the thickness of the protective patch 5 and the width of the slot section 11, it is prevented that the thickness of the protective patch 5 becomes too small and the width of the slot section 11 becomes too large, thus preventing the protective patch 5 from becoming too small and easily breaking and becoming ineffective and lacking a dustproof effect.At the same time, limiting the upper limit of the ratio between the thickness of the protective patch 5 and the width of the slot section 11 prevents the thickness of the protective patch 5 from becoming too large and the width of the slot section 11 from becoming too small, thus preventing the protective patch 5 from becoming too thick and occupying the gap section space provided between the cable harness plate 1 and the safety valve 31, which would reduce the venting space for the breakout and impair the breakout of the high-temperature medium.

[0114] In some embodiments, the protective patch 5 is attached to the side of the support section 32 facing the cable harness plate 1.

[0115] By attaching the protective patch 5 to the support section 32, it is prevented that the protective patch 5 does not occupy a ventilation space, thereby ensuring a gap section space provided between the cable harness plate 1 and the safety valve 31 and ensuring a smooth escape of the high-temperature medium.

[0116] The protective patch 5 can be a small strip that merely closes the slot formed by the slot section 11, or it can be a whole piece that covers the safety valve 31.

[0117] In some embodiments, the projection of the protective patch 5 facing the first surface covers the intended weakening area 312.

[0118] The design weakening area 312 of the safety valve is completely covered by the projection of the protective patch 5 facing the first surface, so that the protective patch 5 protects the entire design weakening area 312 of the safety valve from contamination. This prevents dust and other contaminants from passing through the slot section 11 and falling onto the design weakening area 312 of the safety valve 31. This prevents corrosion or damage to the design weakening area 312 and increases the safety performance.

[0119] In some embodiments, such as in the Fig. 6 and Fig.As shown in Figure 7, the cover plate 33 is further provided with a support section 32 and the support section 32 surrounds the outer circumference of the safety valve 31, wherein the support section 32 has a gas guide groove 321, wherein the thickness direction of the support section 32 is defined as the direction from the surface of the side of the support section 32 facing the safety valve 31 to the surface of the side facing away from the safety valve 31; The gas guide groove 321 runs along the thickness direction of the support section 32;

[0120] In a direction parallel to the plane in which the safety valve 31 is located and perpendicular to the thickness of the support section 32, the maximum width of the gas guide groove 321 is n and satisfies the condition: 0.0016≤n / b≤2.

[0121] In this embodiment, by attaching the protective patch 5 to the side of the support section 32 facing the cable harness plate 1 and by arranging the support section 32 around the safety valve 31, the protective patch 5, the safety valve 31 and the support section 32 can enclose a gas storage chamber.

[0122] By arranging the gas guide groove 321 through the support section 32, the gas storage chamber can be connected to the outside world, which facilitates the helium test.

[0123] By limiting the ratio of the maximum width of the gas guide groove 321 to the width of the slot section 11, the high-temperature medium can quickly melt the protective patch if the maximum width of the gas guide groove is larger, and the width of the slot section 11 can be set narrower.

[0124] In some other embodiments, the optional range of n / b can be selected as 0.002 ≤n / b ≤1.8.

[0125] In some embodiments, such as in Fig. 6 and Fig. As shown in Figure 7, the maximum height of the gas guide groove 321 along a direction perpendicular to the plane in which the safety valve 31 is located is o and satisfies the condition: 0.0016≤o / b≤1.

[0126] By limiting the ratio between the maximum height of the gas guide groove 321 and the width of the slot section 11, the high-temperature medium can quickly melt the protective patch if the maximum height of the gas guide groove 321 is large, and the width of the slot section 11 can be set narrower.

[0127] In some embodiments, the projection of the slot section 11, which faces the first surface, overlaps with the gas guide groove 321 and satisfies the relationship: 0.01 ≤n / b≤2.

[0128] If the projection of the slot section 11 facing the first surface intersects with the gas guide groove 321, the high-temperature medium can melt and expand the slot of the slot section 11 more quickly, whereby the width of the slot section 11 can be adjusted to be narrower at this time.

[0129] In some other embodiments, the projection of the slot section 11, which faces the first surface, does not overlap with the gas guide groove 321 and satisfies the relationship: 0.0016 ≤n / b≤1.9.

[0130] If the projection of the slot section 11, which faces the first surface, does not overlap with the gas guide groove 321, the high-temperature medium melts the slot of the slot section 11 more slowly, i.e., the expansion rate of the slot section 11 is lower, and the width of the slot section 11 can be chosen to be larger at this time to ensure uniform venting.

[0131] In some embodiments, the gas guide groove 321 is a V-shaped groove, and the opening cross-sectional area of ​​the support section 32 gradually decreases from the side of the support section 32 facing the cable harness plate 1 to the side facing away from the cable harness plate 1.

[0132] In some embodiments, the protective patch 5 is bonded to the support section 32. The adhesive bond can make assembly convenient and quick.

[0133] In some embodiments, the overlap area between the protective patch 5 and the support section 32 is at least partially provided with an adhesive layer for bonding, and a gap is locally formed in the adhesive layer perpendicular to the plane in which the protective patch 5 is located, so that the projection of the adhesive layer does not overlap with the gas guide groove 321.

[0134] A gap is locally formed in the adhesive layer so that the projection of the adhesive layer does not overlap with the gas guide groove 321, thus preventing the adhesive layer from blocking the gas guide groove 321 and impairing helium detection, and at the same time preventing poor venting.

[0135] In some embodiments, the width of the gap in a direction parallel to the plane in which the protective patch 5 is located and perpendicular to the thickness direction of the support section 32 is p and satisfies the condition: 2≤n / p≤5. By limiting the ratio between the maximum width of the gas guide groove 321 and the width of the gap formed locally in the adhesive layer, the ratio is too large, meaning that the gas guide groove 321 is too wide and the gap in the adhesive layer is small, which can lead to the adhesive layer overflowing and blocking the gas guide groove 321; if the ratio is too small, this means that the gap in the adhesive layer is too wide, which is not conducive to the fixation of the protective patch 5.

[0136] It should be noted that in some other embodiments the protective patch 5 is provided with a notch 51 and the notch 51 and the gas guide groove 321 are parallel and independent features, i.e.: if the support section 32 is provided with the gas guide groove 321, the protective patch 5 is not provided with the notch 51; and if the protective patch 5 is provided with the notch 51, the support section 32 is not provided with the gas guide groove 321.

[0137] In some embodiments, the protective patch 5 is provided with a notch 51, and the notch 51 runs through the protective patch 5 in a direction perpendicular to the plane in which the protective patch 5 is located;

[0138] The total length of the notch 51 is q and satisfies the condition: 0.016 ≤ q / b ≤ 10. The protective patch 5 is provided with a notch 51, and the notch 51 penetrates the protective patch 5 along the thickness direction of the protective patch. Under normal conditions, the notch 51 is in a closed state; that is, the gas storage chamber enclosed by the protective patch 5, the safety valve 31, and the support section 32 is a closed chamber. During the battery's airtightness test, the notch 51 can be opened under a preset pressure, thereby venting the gas storage chamber. The notch 51 effectively protects the safety valve 31 during normal operation and can also be used for the battery's airtightness test, thus improving battery performance.

[0139] The total length of the notch 51 refers to the length of the notch 51 along the plane in which the protective patch 5 is located. If there are multiple notches 51 or the notches 51 are staggered, the total length of the notches 51 refers to the sum of the lengths of the multiple notches.

[0140] The greater the ratio of the total length of the notch 51 to the width of the slot section 11, the longer the total length of the notch 51. This allows the high-temperature medium to penetrate the protective patch 5 more easily, thus promoting diffusion. In this case, the width of the slot section 11 can be smaller. Conversely, the smaller the ratio of the total length of the notch 51 to the width of the slot section 11, the shorter the total length of the notch 51. This makes it more difficult for the high-temperature medium to penetrate the protective patch 5, which is not conducive to diffusion. In this case, the width of the slot section 11 can be larger. However, the total length of the notch 51 should not be too long to avoid weakening the protective patch 5 and damaging it.

[0141] In this embodiment, the total length q of the notch 51 has a range of values ​​from 3 mm ≤ q ≤ 10 mm. The total length q of the notch 51 can be 3 mm, 4 mm, 5 mm, 6 mm, 8 mm, 9 mm, 10 mm, etc.

[0142] In some other embodiments, the optional range of q / b can be selected as 0.02≤q / b≤9.

[0143] In some embodiments, the thickness of the protective patch is 5 k, and meets the conditions: 10≤q / k≤100 and 0.1 mm≤k≤0.3 mm.

[0144] If the thickness of the protective patch 5 is too great, the notch 51 may be difficult to open during the airtightness test, which impairs the test accuracy; if the thickness of the protective patch 5 is too small, the protective patch 5 may be open in its natural state and foreign bodies such as electrolyte, water, metal shavings, dust, etc. can easily penetrate the interior of the protective patch 5, which poses a safety risk to the battery.

[0145] If the ratio of the total length of the notch 51 to the thickness of the protective patch 5 is too small, the notch 51 will be difficult to open under a certain pressure; if the ratio of the total length of the notch 51 to the thickness of the protective patch 5 is too large, the length of the notch 51 will be longer or the thickness of the protective patch 5 will be less, making it impossible for the protective patches 5 on both sides of the notch 51 to support each other, the notch 51 will open easily in its natural state, and the structural strength will also be low.

[0146] In this embodiment, the thickness k of the protective patch 5 can be 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, etc.

[0147] In some embodiments, the area enclosed by the periphery edge of the protective paving 5 in a direction perpendicular to the plane in which the protective paving 5 is located is s; the area enclosed by the periphery edge of the cover plate 33 in a direction perpendicular to the plane on which the cover plate 33 is located is t; and the following conditions are met: 300 mm 2 ≤s≤1500mm 2 and 0.015≤s / t≤0.75.

[0148] By limiting the area s of the area enclosed by the perimeter edge of the protective paving 5, the protective paving 5 can have a sufficient protective area and the area of ​​the protective paving 5 does not become too large, thereby improving the performance of the protective paving 5.

[0149] By limiting the upper limit of s / t, material waste due to an excessive area of ​​the protective patch 5 can be avoided; by limiting the lower limit of s / t, it can be ensured that the protective patch 5 has a sufficient covering area for the safety valve 31, so that the protective patch 5 can achieve reliable protection for the safety valve 31.

[0150] In this embodiment, the area t of the region enclosed by the circumferential edge of the cover plate 33 has a value range of: 2000 mm² ≤ t ≤ 20000 mm². The area t of the region enclosed by the circumferential edge of the cover plate 33 can be 2000 mm². 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.

[0151] In some embodiments, such as in Fig.As shown in Figure 9, the battery assembly includes a cover plate 33. The cover plate 33 is provided with a filling opening 331, and the minimum distance between the filling opening 331 and the protective patch 5 is u and meets the condition: 5 mm ≤ u ≤ 54 mm. By limiting the lower limit of the minimum distance u between the filling opening 331 and the protective patch 5, the electrolyte can be filled through the filling opening 331, and it is prevented that the electrolyte flows to the location of the protective patch 5 during the filling process, thus ensuring the service life of the protective patch 5 and the safety valve 31. By limiting the upper limit of the minimum distance u between the filling opening 331 and the protective patch 5, it is possible to prevent the cover plate 33 from becoming too large and to avoid material waste.

[0152] In some embodiments, such as in Fig.As shown in Figure 11, at least part of the notch 51 does not run in a straight line, such that the protective paving 5 forms at least one cantilever section 52; the cantilever section 52 comprises a first endpoint 501 and a second endpoint 502, wherein at least part of the notch 51 extends continuously from the first endpoint 501 to the second endpoint 502, the area of ​​the cantilever section 52 is v, and the area of ​​the cantilever section 52 is the area jointly enclosed by the line connecting the first endpoint 501 and the second endpoint 502 and the notch 51 between the first endpoint 501 and the second endpoint 502, where: 1.12 ≤ v ≤ 12.5 mm 2 .

[0153] The protective paving 5 is provided with notches 51 that form at least one cantilever section 52; the area of ​​the cantilever section 52 can correspond to the area enclosed by the notch segments of each cantilever section 52 and the line connecting the two points of the notch segments. For example, a cantilever section 52 can comprise two intersecting notch segments, such that the two intersecting notch segments form a triangular cantilever section, the area of ​​the cantilever section 52 at that time corresponding to the area of ​​the triangle; or a cantilever section 52 can comprise a semicircle, i.e., a semicircular cantilever section is formed, the area of ​​the cantilever section 52 at that time corresponding to the area of ​​a semicircle. In the Fig.In the structure shown in Figure 11, for example, the notch 51 is a curve, and the area of ​​the cantilever section 52 corresponds to the area v shown in the figure. Another example: In the Fig. In the structure shown in Figure 10, the notch 51 is a transverse line, and around the transverse line four cantilever sections 52 are formed, and if there are several cantilever sections 52, the area of ​​each cantilever section 52 is .

[0154] By limiting the upper limit of the area of ​​the boom section 52, it can be ensured that the notch 51 is in a closed state under normal conditions, i.e., that the notch 51 can reliably seal the gas storage chamber closed by the protective patch 5, the safety valve 31 and the support section 32 under normal conditions, thus preventing the protective patch 5 from sagging and foreign bodies from entering the safety valve 31, thereby improving the safety performance of the battery.

[0155] Simultaneously, limiting the lower boundary of the area of ​​the cantilever section 52 ensures that the notch 51 can be opened easily during the airtightness test. This means that the cantilever section 52 formed by the notch 51 can be opened under a preset pressure, thus enabling the airtightness test to be performed on the battery and improving the test efficiency and accuracy. At the same time, the protective patch 5 is not excessively deformed when opened, and its normal long-term use is not affected, thereby extending the service life of the protective patch 5.

[0156] In some embodiments, such as in Fig.As shown in Figure 15, the projection of the slot section 11, which faces the protective patch 5, overlaps at least partially with the notch 51. This ensures that the high-temperature medium can be discharged smoothly and that the gas pipeline is installed more quickly.

[0157] In some other embodiments, the projection of the slot section 11 facing the protective patch 5 does not overlap with the notch 51, and the minimum distance between the projection of the slot section 11 on the protective patch 5 and the notch 51 is w and meets the condition: w ≤ 30 mm. The projection of the slot section 11 facing the protective patch 5 does not overlap with the notch 51, thus preventing foreign matter such as electrolyte, water, metal shavings, dust, etc., from easily entering the gas storage chamber enclosed by the protective patch 5, the safety valve 31, and the support section 32 through the slot section 11. By limiting the upper limit of the minimum distance between the projection of the slot section 11 on the protective paving 5 and the notch 51, it is avoided that the distance becomes too large, which is not conducive to the expansion of the slot section 11 by heat.

[0158] In some embodiments, the battery assembly further comprises the following: an insulating cover plate 4, which is arranged between the cover plate 33 and the cable harness plate 1;

[0159] In the direction perpendicular to the plane of the wiring harness panel, the distance between the surface of the insulating cover plate facing the wiring harness panel and the body of the cover plate is K1, and the distance between the surface of the protective patch facing the wiring harness panel and the body of the cover plate is K2, provided that the condition is: 0.9 ≤ K1 / K2 ≤ 1.1. Optionally, the surface of the insulating cover plate 4 facing the wiring harness panel 1 is flush with the surface of the protective patch 5 facing the wiring harness panel 1.

[0160] By setting 0.9≤K1 / K2≤1.1, the insulating cover plate 4 and the protective patch 5 can jointly support the cable harness plate 1, ensuring the support effect of the cable harness plate 1 and providing a soft support that prevents damage to the cable harness plate 1.

[0161] In some embodiments, the support section 32 is made of metal and the insulating cover plate 4 is made of plastic.

[0162] The support section 32 offers higher support strength than the insulating cover plate 4 and thus provides better support for the central part of the cable harness plate 1, which prevents expansion from the slot section 11 after the high temperature medium has broken out.

[0163] In some embodiments, such as in Fig.As shown in Figure 3, the cable harness panel 1 comprises a cable harness panel body 10 and a collecting branch 12, which is formed in at least one part of the cable harness panel 1, wherein a cutting slot 13 is provided between the cable harness panel body 10 and the collecting branch 12 and along the width direction perpendicular to the slot section 11 the vertical distance from the root, at which the cutting slot 13 is connected to the main conductor, to the edge of the slot section 11 facing the root is x and satisfies: 5mm≤x≤30mm.

[0164] The root, where the cutting slot 13 is connected to the main line, refers to the area where the collector branch 12 is connected to the cable harness board body 10.

[0165] By limiting the lower limit of the minimum distance between the cutting slot 13 and the slot section 11, it is avoided that the cutting slot 13 and the slot section 11 are too close together, which would lead to insufficient strength of the main body of the cable harness board body 10, and that the cutting slot 13 and the slot section 11 are too small to facilitate routing.

[0166] By limiting the upper limit of the minimum distance between the cutting slot 13 and the slot section 11, material waste caused by an excessively large overall size of the cable harness plate 1 can be avoided.

[0167] In some embodiments, the following condition is met if the projection of the cutting slot 13 facing the first surface overlaps at least partially with the safety valve 31: 2 mm ≤ b ≤ 20 mm. If the projection of the cutting slot 13 facing the first surface overlaps at least partially with the safety valve 31, the high-temperature medium can also be ejected from the cutting slot 13, whereby the width of the slot section 11 can be adjusted accordingly to be narrower at this time.

[0168] In some embodiments, such as in Fig.As shown in Figure 3, the longitudinal direction of the slot section 11 runs parallel to the longitudinal direction of the cable harness panel 1, and along the lateral direction of the slot section 11, the total width of the cable harness panel 1 is z and satisfies the condition: 0.1 ≤ y / z ≤ 0.8. If the ratio of the width of the cutting slot 13 to the total width of the cable harness panel 1 is too large, the width of the cutting slot 13 is too large and less space remains for wiring on the cable harness panel 1; and if the ratio of the width of the cutting slot 13 to the total width of the cable harness panel 1 is too small, the width of the cutting slot 13 is too small, which is not conducive to the rapid diffusion of the high-temperature medium.

[0169] In some embodiments, such as in Fig.As shown in 12, the cable harness plate 1 further comprises a fuse 14, wherein along the width direction of the slot section 11 the minimum distance between the fuse 14 and the slot section 11 is A and the condition is met: 1 mm≤A≤10mm.

[0170] If the minimum distance A between fuse 14 and slot section 11 is less than the lower limit, fuse 14 is too close to slot section 11, i.e., fuse 14 is close to safety valve 31. Therefore, after the safety valve 31 opens, the high-temperature medium can damage fuse 14, and fuse 14 will not be able to protect the circuit of the wiring harness board 1. If the minimum distance A between fuse 14 and slot section 11 is greater than the upper limit, fuse 14 is too close to slot section 11, i.e., fuse 14 is too far from safety valve 31. This increases the product dimensions and makes product implementation more difficult.

[0171] Inside the wiring harness plate 1, several cell body conductor wires 16 are provided, and the cell body conductor wires 16 can be copper wires. Fuse 14 consists of a section of the cell body conductor wire 16 with a reduced diameter.

[0172] If fuse 14 is located closer to the collector branch 12, it reacts faster and offers better safety performance.

[0173] In other embodiments, the range of A can be selected as 2 mm ≤ A ≤ 9 mm.

[0174] In some embodiments, the wire diameter of fuse 14 B meets the condition: 0.1 mm ≤ B ≤ 0.3 mm.

[0175] The wire diameter of fuse 14 determines its minimum breaking current, where the minimum breaking current = minimum permissible voltage / loop battery resistance.

[0176] By limiting the wire diameter parameters of fuse 14, it can be ensured that fuse 14 opens quickly in the event of a short circuit, which increases safety.

[0177] In some embodiments, fuse 14 is S-shaped.

[0178] In some embodiments, the length of the fuse is 14 D and satisfies the condition: 0.16 ≤D / b≤ 10.

[0179] Since fuse 14 must meet a fixed minimum breaking current, its wire diameter is specified, and its length affects the breaking time. If the ratio between the length D of fuse 14 and the width of slot section 11 is too small, this means that the width of slot section 11 is too large and the fuse is too short, resulting in an insufficient melting time and failure to meet the melting time requirement. Conversely, if the ratio is too large, this means that the width of slot section 11 is too small and the melting time is too long, again resulting in an insufficient melting time and failure to meet the melting time requirement.

[0180] Since fuses are formed by stretching and tapering the cell-body conductor wires 16 in the main circuit, the length of the fuse decreases as the thinner individual cell-body conductor wires 16 become thinner after the thinner body has been stretched to form a fuse with a fixed diameter. The wider the slot section 11, the smaller the overall wiring space of the cable harness board 1. For a fixed number of collections, i.e., a fixed number of wires, the thinner the individual cell-body conductor wire 16, the shorter the length of the resulting fuse and the shorter its melting time.

[0181] However, the length of the fuse must not be too short, otherwise the melting time requirement will not be met.

[0182] This means: The smaller the ratio between the length of the fuse 14 and the width of the slot section 11, the shorter the fuse 14 length and the wider the slot section 11 (i.e., the thinner the single-core cell body conductor wire 16), and the shorter the fuse's melting time. If the melting time requirement is met, a shorter fuse melting time is better. Conversely, the larger the ratio between the length of the fuse 14 and the width of the slot section 11, the longer the fuse 14 length and the smaller the slot section 11 width (i.e., the thicker the single-core cell body conductor wire 16), the slower the fuse melting time. Exceeding a certain limit can lead to safety hazards.

[0183] In some embodiments, the length of the fuse is 14 D and meets the condition: 8 mm ≤D ≤ 15 mm.

[0184] Since the fuse 14 must meet a fixed minimum melting current, its wire diameter is specified, and its length affects the melting time. If the fuse 14 is too long, the cell body conductor wire 16 of the main circuit must be thicker, which is detrimental to material savings, cost reduction, and space efficiency. However, the fuse 14 must not be too short, otherwise the melting time requirement will not be met.

[0185] In some embodiments, the cable harness panel 1 further comprises a cell body conductor wire 16 and a protective film 15 covering the cell body conductor wire 16, wherein the number of cell body conductor wires 16 is defined as E, the wire diameter of the cell body conductor wire 16 is defined as F, and the total width of the cable harness panel 1 along the width direction of the slot section 11 is defined as z, wherein the following is satisfied: 0.05≤(E⋅F / z)b≤15; and: 1 mm≤b≤60 mm; 3≤E⋅F≤15.

[0186] In the relationship (E·F / z) / b, the physical meaning of the numerator is the width ratio of the cell body conductor wire 16 in the wiring harness plate 1, and the denominator is the width of the slot section 11. The width of the slot section 11 is influenced by the distance between the positive and negative terminals of the battery and lies within a fixed range. If the ratio is too large, the proportion of the cell body conductor wire 16's width in the wiring harness plate 1 is too large, and the width of the slot section 11 is too small. Since the melting point of the cell body conductor wire 16 is generally high, it generally does not melt after the safety valve opens.Therefore, a large area of ​​the cell body conductor wire 16 covers the area of ​​the safety valve, which impairs its rapid opening; if the ratio is too small, this means that the proportion of the width of the cell body conductor wire 16 in the cable harness plate 1 is too small and the width of the slot section 11 is too large, which can easily cause the entire rupture disc to fly out.

[0187] In some embodiments, the thickness of the protective film 15 in a direction perpendicular to the cable harness plate 1 G is and meets the condition: 0.2≤G / b≤ 4.17.

[0188] The thicker the protective film 15, the less susceptible it is to thermal contraction and the slower the slot section 11 expands, meaning the initial width of the slot section 11 should be larger. Conversely, the thinner the protective film 15, the more susceptible it is to thermal contraction and the faster the slot section 11 expands, meaning the initial width of the slot section 11 can be correspondingly smaller.

[0189] In this embodiment, 1 mm ≤ b ≤ 60 mm is chosen. The thickness G of a single layer of protective film 15 can be in the range of 25 micrometers ≤ G ≤ 200 micrometers.

[0190] In some embodiments, the slot section 11 is formed by the slot between two adjacent cable harness plates 1.

[0191] In other embodiments, the slot section 11 is formed by hollowing out at least part of a cable harness plate 1.

[0192] In some embodiments, several battery cells 3 are stacked to form a battery row 2, and the slot section 11 runs continuously along the stacking direction of the battery cells 3.

[0193] In other embodiments, several battery cells 3 are stacked to form a battery row 2, and the cable harness plate 1 is provided with several slots 11 along the stacking direction of the battery row 2, with a spacer section 17 formed between two adjacent slot sections 11.

[0194] The formation of a spacer section 17 between two adjacent slot sections 11 increases the overall strength of the cable harness plate 1.

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

[0196] This gap between two adjacent battery cells 3 is arranged according to the spacing section, thereby preventing dust from entering the gap between the two adjacent battery cells 3 and increasing safety. At the same time, it increases the overall strength of the wiring harness panel 1.

[0197] In some embodiments, the thickness of the cable harness plate is 1H and meets the condition: 0.08mm≤H≤0.335mm.

[0198] The wiring harness panel 1 has a temperature resistance of -40 °C to 85 °C (1000 hours); the specific test method for the temperature resistance of the wiring harness panel 1 is as follows: ① Low-temperature test: 1000 hours at -40 °C. Every 250, 500, and 1000 hours, a visual inspection of the adhesive on the sample was performed, the resistance of each NTC was tested at room temperature, and the ambient temperature was recorded. (Note: The FPC should be left at room temperature for 10 minutes. The resistance test should be performed after room temperature has been reached.) Each resistance test should be completed within 24 ± 2 hours. 2. High-temperature test: 1000 hours at 85 °C. Every 250, 500, and 1000 hours, a visual inspection of the adhesive on the sample was performed, the resistance of each NTC was tested at room temperature, and the ambient temperature was recorded. (Note: The FPC should be left at room temperature for 10 minutes. The resistance test should be performed after reaching room temperature.) Each resistance test should be completed within 24 ± 2 hours.

[0199] After the low-temperature test, the FPC's performance met the insulation dielectric strength requirements. No visible damage, breaks, or cracks were found in the adhesive. Following the test, the NTC resistance at 25°C was compared to the corresponding resistance value in the RT table, with a required tolerance of ≤±1°C.

[0200] Following the high-temperature test, the FPC's performance met the insulation dielectric strength requirements. No visible damage, breaks, or cracks were found in the adhesive. After the test, the NTC resistance at 25 °C was compared to the corresponding resistance value in the RT table, with a required tolerance of ≤±1 °C.

[0201] The insulation performance parameters of cable harness board 1 meet the following requirements: ① The insulation resistance and leakage current dielectric strength between each FPC busbar meet the following requirements: Insulation resistance ≥ 100 MΩ at 1000 VDC (60 s), leakage current dielectric strength ≤ 1 mA at 1000 VDC (60 s), and no flashover or breakdown occurs during the test; 2. The insulation resistance and leakage current dielectric strength between the FPC and the insulation layer meet the following requirements: Insulation resistance ≥ 500 MΩ at 1000 VDC (60 S), leakage current dielectric strength ≤ 1 mA at 2800 VDC (60 S).

[0202] The specific test procedure for the insulation performance of cable harness panel 1 is as follows: ① Test procedure for insulation resistance, dielectric strength, and leakage current between FPC busbars: 1. Set the insulation voltage tester to 1000 V DC, test the insulation resistance between adjacent busbars across the connector, and read and record the resistance value. 2. Set the insulation voltage tester to 1000 V DC, test the dielectric strength and leakage current between adjacent busbars across the connector, and read and record the leakage current value. (Note: The positive and negative circuits of the same NTC should be combined into a single conductor, and multiple conductors at the same busbar should be combined into a single conductor.) ① Test procedure for insulation resistance, dielectric strength, and leakage current between FPC busbars: 1.1. Set the insulation voltage tester to 1000 V DC, test the insulation resistance between adjacent busbars across the connector, read the measured resistance value, and record it. 2. Set the insulation voltage tester to 2800 V DC, test the dielectric strength and leakage current between adjacent busbars across the connector, read the leakage current value, and record it. (Note: The positive and negative circuits of the same NTC should be combined into a single conductor, and multiple conductors at the same busbar should be combined into a single conductor.) In some embodiments, the battery cell 3 comprises a housing 35, and the housing 35 is made of steel; the dimension a of the remaining section 311 satisfies the conditions: 10 mm ≤ a ≤ 15 mm. and 0.033 ≤b / a≤2.

[0203] The housing 35 is made of steel. Due to the high melting point and hardness of steel, the valve opening pressure is high. The increased gas pressure after the valve opens exerts a greater force on the wiring harness plate 1, so the width of the slot section 11 can be reduced accordingly at this point.

[0204] The remaining section 311 can be enlarged accordingly, which allows more connections with other areas of the housing or cover plate and reduces the likelihood that the rupture disc will break and fly out under force.

[0205] In some other embodiments, the battery cell 3 comprises a housing 35 made of aluminum.

[0206] In some embodiments, the battery cell 3 comprises a pole column 34, wherein the pole column 34 and the safety valve 31 are located on the same side of the battery cell 3 and the safety valve 31 is located between the pole columns of the two polarities 34, and the safety valve 31 and the pole column 34 are spaced apart from each other; the length dimension of the first surface is defined as L and satisfies the conditions: 0.05≤c / L≤12 and 0.008≤b / c≤3.

[0207] Since the terminal column 34 and the safety valve 31 are located on the same side surface of the battery cell 3, the safety valve 31 is situated between the terminal columns 34 of the two polarities and is spaced apart from the terminal columns 34. When the safety valve 31 opens, splashing of the high-temperature medium onto the terminal columns is undesirable to prevent short circuits and heat dissipation. Therefore, the space for the safety valve 31 and the wiring harness plate 1 above the safety valve 31 is limited, and the safety valve 31 and the wiring harness plate 1 must not be too wide. To achieve weight reduction quickly, the area of ​​the safety valve 31 must not be too small. By limiting the lower limit of c / L, an insufficient valve opening area caused by an excessively small area of ​​the safety valve 31 is avoided.Limiting the upper limit of c / L prevents the distance between the safety valve 31 and the pole column from becoming too small and prevents the high-temperature medium from being sprayed onto the pole column.

[0208] The upper limit of the b / c ratio is defined such that the width of the slot section 11 does not become too large and thus, with a limited width of the cable harness plate 1, there is not enough space for the wiring; by limiting the lower limit of the b / c ratio, it is prevented that the width of the slot section 11 becomes too small, which would impede the pressure relief.

[0209] In some other embodiments, the battery cell 3 includes a pole column 34 located on a different side of the battery cell 3 than the safety valve 31; the total width of the wiring harness plate 1 along the width of the slot section 11 is z and satisfies the conditions: 10 mm ≤ z ≤ 250 mm; and 0.004 ≤ b / c ≤ 3.

[0210] Since the terminal column 34 and the safety valve 31 are located on opposite sides of the battery cell 3, opening the safety valve 31 does not cause any spatial restriction due to the terminal column. Therefore, the high-temperature medium is not sprayed onto the terminal column, allowing the c / L area to be optimally enlarged. Furthermore, the b / c ratio is limited to an upper limit to prevent the slot section 11 from becoming too wide and thus avoid insufficient wiring space with a narrow cable harness plate 1. Limiting the b / c ratio to a lower limit prevents the slot section 11 from becoming too narrow and thus impairing pressure relief.

[0211] In one embodiment, the safety valve 31 is provided on the top side of the battery cell 3.

[0212] If the safety valve 31 is provided on the top of the battery cell 3, the width of the slot section 11 can be increased accordingly to prevent the heat from becoming excessively concentrated and accumulating and breaking through the box cover or even reaching the passenger compartment.

[0213] In one embodiment, the safety valve 31 is provided on the side surface of the battery cell 3.

[0214] If the safety valve 31 is located on the side of the battery cell 3, the safety risk on this side surface is lower, which means that the heat cannot so easily concentrate and accumulate excessively and break through the box cover or even reach the passenger compartment, so that the hot medium can concentrate to a certain degree and the width of the slot section 11 can be reduced accordingly.

[0215] In this embodiment, the total width z of the cable harness plate 1 can be 10 mm or 15 mm or 20 mm or 40 mm or 50 mm or 60 mm or 75 mm or 85 mm or 100 mm or 120 mm or 160 mm or 170 mm or 190 mm or 200 mm or 220 mm or 230 mm or 250 mm, or an interval range formed by any two of the above values.

[0216] In some embodiments, the battery cell 3 comprises a cover plate 33, wherein the cover plate 33 is provided with a filling opening 331, the projection of the slot section 11 onto the plane on which the cover plate 33 is located does not overlap with the filling opening 331; and the minimum distance between the projection of the slot section 11 onto the plane on which the cover plate 33 is located and the filling opening 331 is I and satisfies the condition: 5mm≤I≤188 mm.

[0217] The projection of the slot section 11 on the cover plate 33 does not overlap with the filling opening 331, thus preventing foreign matter such as electrolyte, water, metal shavings and dust from falling through the slot section 11 onto the filling opening 331 and damaging the filling opening 331.

[0218] By limiting the minimum distance between the projection of the slot section 11 on the cover plate 33 and the filling opening 331, erosion of the filling opening 331 by foreign bodies can be prevented. At the same time, limiting the minimum distance between the projection of the slot section 11 on the cover plate 33 and the filling opening 331 allows for precise control of the overall dimensions of the battery, thus avoiding faulty layout and material waste.

[0219] In this embodiment, the minimum distance I between the projection of the slot section 11 on the cover plate 33 and the filling opening 331 can be 5 mm or 10 mm or 15 mm or 20 mm or 40 mm or 50 mm or 60 mm or 75 mm or 85 mm or 100 mm or 120 mm or 160 mm or 170 mm or 188 mm, or an interval range formed by any two of the above values.

[0220] In some embodiments, the battery capacity of battery cell 3 is defined as J and satisfies the condition: 0.0004 mm / Ah≤b / J≤0.5mm / Ah.

[0221] Since the battery capacity is related to the weight loss ratio that must be achieved when opening the safety valve, the slot section 11 must be wider the larger the battery capacity is, thus preventing the required weight loss ratio from not being achieved.

[0222] In some embodiments, the battery cell 3 comprises a housing 35, wherein the housing 35 is provided with an opening section and the battery cell 3 further comprises a cover plate 33 covering the opening section, wherein the cover plate 33 and the housing 35 together enclose a receiving space, wherein the length of the receiving space is in the range of 100 mm to 380 mm; the width of the receiving space is in the range of 50 mm to 250 mm; and the thickness of the receiving space is in the range of 15 mm to 100 mm.

[0223] According to the embodiments of the present application, in the second aspect a battery pack is further provided comprising: a battery assembly as described above; a base plate, wherein the battery cells 3 are placed on the base plate and the cable harness plate 1 is arranged on a side of the battery cells 3 facing away from the base plate.

[0224] Obviously, the above embodiments are merely examples for clarification and are not intended to limit the embodiments. Although the embodiments of the present application are described in conjunction with the figures, a person skilled in the art can make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

[1] Battery assembly, characterized by that it includes the following: a battery cell (3) comprising a housing (35), the housing (35) being provided with a safety valve (31); wherein a side of the housing (35) being provided with the safety valve (31) is defined as the first surface and the safety valve (31) comprises an open weakening area (312), the weakening area (312) being designed to allow pressure relief of the battery cell (3) by tearing open the weakening area (312); and a residual section (311) located within the open portion of the weakening area (312), the weakening area (312) and the residual section (311) together enclosing a continuous closed annular contour; wherein, along a direction perpendicular to the first surface, the thickness of the residual section (311) is greater than the thickness of the weakening area (312); a wiring harness panel (1), wherein the wiring harness panel (1) comprises an information acquisition component designed to acquire the battery temperature and / or voltage of at least one battery cell (3), and located on the side of the battery cell (3) that is provided with the safety valve (31); wherein the wiring harness panel (1) has a slot section (11) extending through the top and bottom surfaces of the wiring harness panel (1) and forming a slot; wherein a projection of the slot section (11) overlaps at least partially with the safety valve (31) in the direction of the first surface; wherein the two ends of the intended weakening area (312) form a first end section and a second end section, and the area between the first end section and the second end section of the intended weakening area (312) forms the residual section (311), wherein the straight-line distance between the first end section and the second end section is defined as dimension a of the residual section (311), along the width direction of the slot section (11) the width of the slot section (11) is defined as b and the dimension of the safety valve (31) is defined as c, wherein: c > b and 0.01≤b / a≤12; wherein the multiple battery cells (3) are stacked to form a cell row (2), and wherein the longitudinal direction of the residual section (311) is parallel to the longitudinal direction of the first surface; wherein along the lateral direction of the first surface the residual section (311) of the safety valve (31) of one of the battery cells (3) is arranged facing the residual section (311) of the safety valve (31) of the battery cell (3) on one side and facing away from the residual section (311) of the safety valve (31) of the battery cell (3) on the other side; wherein the longitudinal direction of the slot section (11) is parallel to the lateral direction of the first surface and along the lateral direction of the slot section (11) the width b of the slot section (11) satisfies the condition: 1 mm ≤ b ≤ 50 mm; wherein the battery cell (3) comprises a housing (35), wherein the housing (35) is a steel shell and the dimension a of the remaining section (311) satisfies the condition: 10mm≤a≤15mm; and it holds that: 0.033≤b / a≤2. [2] Battery assembly according to claim 1, characterized by , that the safety valve (31) has a continuous target weakening area (312), wherein the target weakening area (312) and the remaining section (311) together enclose a continuous closed ring contour. [3] Battery assembly according to claim 1, characterized by , that the thickness of the cable harness plate (1) in a direction perpendicular to the plane on which the cable harness plate (1) is located is f and satisfies the condition: 185 micrometers ≤f≤ 335 micrometers. [4] Battery assembly according to claim 1, characterized by , that the battery cell (3) has a housing (35), wherein the housing (35) is made of aluminium. [5] Battery assembly according to claim 2, characterized by, that the battery cell (3) comprises a pole column (34), wherein the pole column (34) and the safety valve (31) are arranged on the surface of the same side of the battery cell (3), and wherein the safety valve (31) is located between the pole columns (34) of two polarities and the safety valve (31) and the pole column (34) are spaced apart; wherein the length dimension of the first surface is defined as L and satisfies the condition: 0.05≤c / L≤12 and 0.008≤b / c≤3. [6] Battery assembly according to claim 2, characterized by , that the battery cell (3) comprises a pole column (34), wherein the pole column (34) and the safety valve (31) are arranged on the surface of different sides of the battery cell (3); wherein along the width direction of the slot section (11) the total width of the wiring harness plate (1) is z and satisfies the condition: 10 mm ≤z ≤ 250 mm and 0.004 ≤ b / c ≤ 3. [7] Battery assembly according to claim 5, characterized by, that the safety valve is located on the top of the battery cell (3). [8] Battery assembly according to claim 6, characterized by , that the safety valve is arranged on the side surface of the battery cell (3). [9] Battery assembly according to claim 1, characterized by , that the battery cell (3) comprises a cover plate (33) wherein the cover plate (33) is provided with a filling opening (331), the projection of the slot section (11) onto the plane on which the cover plate (33) is located does not overlap with the filling opening (331); and the minimum distance between the projection of the slot section (11) onto the plane on which the cover plate (33) is located and the filling opening (331) is I and satisfies the condition: 5mm≤I≤188 mm. [10] Battery assembly according to claim 1, characterized by , that the battery capacity of the battery cell (3) is defined as J and satisfies the condition: 0.0004mm / Ah≤b / J≤0.5mm / Ah. [11] Battery assembly according to claim 1, characterized by , that the battery cell (3) comprises a housing (35) wherein the housing (35) is provided with an opening section and that the battery cell (3) further comprises a cover plate (33) covering the opening section, wherein the cover plate (33) and the housing (35) together enclose a receiving space, wherein the length of the receiving space is in the range of 100 mm to 380 mm; the width of the receiving space is in the range of 50 mm to 250 mm; and the thickness of the receiving space is in the range of 15 mm to 100 mm. [12] Battery pack, characterized by that it includes the following: a battery assembly according to any one of claims 1 to 11; a base plate wherein the battery cells (3) are placed on the base plate and the cable harness plate (1) is arranged on a side of the battery cells (3) facing away from the base plate.

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