Battery assembly and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery assembly and a battery pack, and the battery assembly comprises a battery monomer which is provided with a first outer surface provided with an anti-explosion valve; the circuit board and the first outer surface are arranged in parallel and at an interval; the projection of the circuit board on the first outer surface is at least partially overlapped with the anti-explosion valve; a through part is formed in the circuit board, and the through part is suitable for being closed under normal pressure and opened under preset pressure; the distance between the surface, facing the side of the circuit board, of the anti-explosion valve and the surface, facing the side of the anti-explosion valve, of the circuit board is d, the length of the penetrating part is L, and the requirement that d.L is larger than or equal to 15 mm < 2 > and smaller than or equal to 20000 mm < 2 > is met. According to the battery assembly provided by the utility model, when the length L of the through part is longer, the corresponding opening length of the through part is larger when the explosion-proof valve is opened, and the pressure relief speed is higher; when the distance d is larger, the pressure relief space between the circuit board and the anti-explosion valve is more sufficient, the anti-explosion valve is not prone to being blocked, the pressure relief speed is higher, and the through part is easier to burst open.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery technology field, concretely relates to a battery assembly and battery pack. BACKGROUND

[0002] The battery pack is formed by stacking a plurality of battery monomers, and the FPC sometimes covers the explosion-proof valve due to the compact space in the battery pack. However, when the explosion-proof valve is opened, the FPC blocks the discharge of high-temperature medium, affecting the pressure relief speed. SUMMARY

[0003] Therefore, the utility model provides a battery assembly and battery pack to solve the problem that the FPC easily affects the pressure relief speed.

[0004] In a first aspect, the utility model provides a battery assembly, comprising:

[0005] The battery monomer has a first outer surface provided with an explosion-proof valve;

[0006] The circuit board is located on the side of the battery monomer provided with the explosion-proof valve and is arranged in parallel and spaced apart from the first outer surface. In the direction perpendicular to the first outer surface, the projection of the circuit board on the first outer surface at least partially coincides with the explosion-proof valve. The circuit board forms a through portion, which is adapted to be closed under normal pressure and opened under a preset pressure.

[0007] In the direction perpendicular to the first outer surface, the distance between the surface of the explosion-proof valve towards the side of the circuit board and the surface of the circuit board towards the side of the explosion-proof valve is d, the length of the through portion is L, and the following condition is satisfied: 15mm 2 ≤d·L≤20000mm 2 .

[0008] The battery assembly provided by the embodiments of the utility model has the through portion formed in the circuit board, which is opened correspondingly when the explosion-proof valve is in the open valve state and reaches the preset pressure, thereby avoiding the circuit board blocking the discharge of high-temperature medium when the explosion-proof valve is opened. By limiting the range of d·L, when the length L of the through portion is longer, the length of the through portion opened correspondingly when the explosion-proof valve is opened is larger, the area of the pressure relief channel is larger, and the pressure relief speed is faster. When the distance d is larger, the pressure relief space between the circuit board and the explosion-proof valve is sufficient, the explosion-proof valve is less likely to be blocked, the pressure relief speed is faster, and the through portion is more likely to be flushed open. Therefore, when the distance d is large, the length L of the through portion can be small, and when the distance d is small, the length L of the through portion needs to be set larger to meet the requirement of the pressure relief speed.

[0009] In a second aspect, the utility model further provides a battery pack, comprising: the battery assembly as described above.

[0010] Since the battery pack comprises the battery assembly, has the same effect with the battery assembly, here is not repeated. BRIEF DESCRIPTION OF DRAWINGS

[0011] In order to more clearly illustrate the specific embodiment of the present application or the technical scheme in the prior art, the drawings needed to be used in the specific embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0012] Figure 1 It is a top view of the battery assembly of the present application.

[0013] Figure 2 It is a partial schematic view of the battery monomer and the circuit board in a perspective state.

[0014] Figure 3 It is a cross-sectional schematic view of the battery assembly of the present application.

[0015] Figure 4 It is a partial schematic view of the first circuit board of the present application.

[0016] Figure 5 It is a partial schematic view of the second circuit board of the present application.

[0017] Figure 6 It is a schematic view of the second circuit board and the battery monomer in a matching state.

[0018] Figure 7 It is a partial schematic view of the battery monomer and the circuit board in a perspective state when the battery monomer is provided with the first reinforcing rib.

[0019] Figure 8 It is a partial schematic view of the battery monomer and the circuit board in a perspective state when the battery monomer is provided with the second reinforcing rib.

[0020] Figure 9 It is a schematic view of the explosion-proof valve with the second reinforcing rib of the present application.

[0021] Figure 10 It is a size drawing of the explosion-proof valve with the second reinforcing rib of the present application.

[0022] Figure 11 It is a schematic view of the explosion-proof valve with the third reinforcing rib of the present application.

[0023] Figure 12 It is a schematic view of the explosion-proof valve with the fourth reinforcing rib of the present application.

[0024] Figure 13 Figure 5 is a schematic view of the anti-explosion valve with the fifth reinforcing rib of the utility model.

[0025] Mark explanation:

[0026] 1, circuit board; 2, battery column; 3, battery monomer; 4, gas storage cavity;

[0027] 11, through part; 12, gap part; 13, overlapping area; 101, first circuit board body; 102, second circuit board body;

[0028] 31, anti-explosion valve; 311, reinforcing rib; 312, score part; 3111, first end point; 3112, second end point; 3101, first reinforcing rib section; 3102, second reinforcing rib section; 3103, third reinforcing rib section; 32, first outer surface. Specific implementation

[0029] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the utility model.

[0030] In the description of the utility model, it needs to be explained that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is the orientation or position relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0031] In the description of the utility model, it needs to be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0032] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0033] The following is combined Figures 1 to 13 The following describes embodiments of the present invention.

[0034] According to an embodiment of the present invention, in one aspect, a battery assembly is provided, comprising:

[0035] The battery cell 3 has a first outer surface 32 on which an explosion-proof valve 31 is provided;

[0036] The circuit board 1 is located on the side of the battery cell 3 where the explosion-proof valve 31 is provided, and is parallel to and spaced apart from the first outer surface 32; in the direction perpendicular to the first outer surface 32, the projection of the circuit board 1 on the first outer surface 32 at least partially coincides with the explosion-proof valve 31; the circuit board 1 is formed with a through portion 11, which is adapted to close under normal pressure and open under a preset pressure.

[0037] Along the direction perpendicular to the first outer surface 32, the distance between the surface of the explosion-proof valve 31 facing the circuit board 1 and the surface of the circuit board 1 facing the explosion-proof valve 31 is d, and the length of the through portion 11 is L, satisfying: 15mm 2 ≤d·L≤20000mm 2 .

[0038] The first outer surface 32 of the battery cell 3, which is provided with the explosion-proof valve 31, can be the outer surface of the battery cell 3 housing or the outer surface of the cover plate.

[0039] Since the circuit board 1 is parallel to and spaced apart from the first outer surface 32, combined with Figure 3 As shown, a support structure can be provided around the explosion-proof valve 31 to create a gap between the circuit board 1 and the first outer surface 32. In this embodiment, the support structure can be arranged around the circumferential edge of the explosion-proof valve 31, so that the circuit board 1, the explosion-proof valve 31, and the support structure together enclose and form a gas storage cavity 4, thereby preventing the circuit board 1 from directly sticking to the explosion-proof valve 31 and affecting its opening, and ensuring the smooth opening of the explosion-proof valve 31.

[0040] The circuit board 1 has a through section 11, which can take various forms, as detailed below. The through section 11 is closed under normal conditions, meaning the circuit board 1 is in a sealed state at the through section 11, thus preventing condensate or metal impurities from falling onto the explosion-proof valve and causing corrosion or short circuits. The through section 11 opens when the explosion-proof valve 31 is in the open state. When the explosion-proof valve 31 is open, the high-temperature medium is discharged from the battery cell 3. The rapidly discharged high-temperature medium breaks through the through section 11 of the circuit board 1, opening the through section 11 and facilitating pressure relief.

[0041] In the direction perpendicular to the first outer surface 32, the distance between the surface of the explosion-proof valve 31 toward the side of the circuit board 1 and the surface of the circuit board 1 toward the side of the explosion-proof valve 31 is d, which is also the height of the gas storage cavity 4 in this embodiment.

[0042] Since the through portion 11 has various structural forms, it can be provided in one continuous strip or in multiple through portions 11 arranged at intervals. It should be noted that the length L of the through portion 11 in this embodiment refers to the length of a single through portion 11. The length L of the through portion 11 can be in the range of 15 mm≤L≤2000 mm. When multiple through portions 11 are arranged at intervals, the length L of the through portion 11 is slightly smaller, for example, 15 mm≤L≤50 mm. When the through portion 11 is provided in one continuous strip, the length is slightly larger, and can be up to 2000 mm.

[0043] In this embodiment, the distance d can be in the range of 1 mm≤d≤10 mm.

[0044] The battery assembly provided by the embodiment of the utility model, the circuit board 1 is provided with the through portion 11, and the through portion 11 is opened corresponding to the opening of the explosion-proof valve 31, so that when the explosion-proof valve is opened, the circuit board 1 avoids blocking the discharge of the high-temperature medium. By limiting the range of d·L, when the length L of the through portion 11 is longer, the length of the through portion corresponding to the opening of the explosion-proof valve 31 is larger when the explosion-proof valve 31 is opened, the area of the pressure relief channel is larger, and the pressure relief speed is faster. When the distance d is larger, the pressure relief space between the circuit board 1 and the explosion-proof valve 31 is sufficient, the explosion-proof valve 31 is less likely to be blocked, the pressure relief speed is faster, and the through portion is more likely to be flushed open. Therefore, when the distance d is large, the length L of the through portion 11 can be small, and when the distance d is small, the length L of the through portion 11 needs to be set to be larger to meet the requirement of the pressure relief speed.

[0045] In some embodiments, in combination with Figure 4 As shown in the figure, the circuit board 1 includes a first circuit board body 101 and a second circuit board body 102, and the first circuit board body 101 and the second circuit board body 102 are at least partially overlapped to form an overlapping area 13, and the through portion 11 is formed at the joint of the first circuit board body 101 and the second circuit board body 102. It is satisfied that 75 mm 2 ≤d·L≤20000 mm 2 ; and 5 mm≤d≤10 mm.

[0046] In the embodiment, the circuit board 1 is composed of two pieces, the first circuit board body 101 and the second circuit board body 102 are overlapped to form the overlapping area 13, and the through part 11 is formed at the joint of the first circuit board body 101 and the second circuit board body 102. In the normal use state, the overlapping area 13 overlaps each other to close the through part 11, and in the open valve state of the explosion-proof valve, the overlapping area 13 is opened to open the through part 11. The overlapping area 13 is relatively difficult to be opened by high-temperature medium, so it needs enough pressure relief space, that is, the distance d needs to be appropriately large, but it cannot be too large, otherwise it will lead to insufficient pressure, and the overlapping area 13 is more difficult to be opened. Therefore, the distance d can be slightly larger than the upper limit.

[0047] In some embodiments, the circuit board 1 includes the first circuit board body 101 and the second circuit board body 102, one side edge of the first circuit board body 101 is arranged in abutment with one side edge of the second circuit board body 102, and the through part 11 is formed at the abutment joint of the first circuit board body 101 and the second circuit board body 102.

[0048] In some embodiments, the through part 11 is formed by at least partially thinning the surface of the circuit board 1; and satisfies: 15mm 2 ≤d·L≤20000mm 2 ; and satisfies: 1mm≤d≤5mm.

[0049] In the embodiment, the through part 11 is a scratch-like structure, which is formed by locally thinning the circuit board 1, so that the circuit board 1 does not need to be composed of two pieces, and does not need to be overlapped. Therefore, the through part 11 is more easily opened. The distance d can be relatively small, and L can be relatively large, but L cannot be too large to avoid the scratch being too long and being opened in the normal state due to vibration conditions.

[0050] In some embodiments, as shown in Figure 4 , the through part 11 is one, and is continuously arranged on the circuit board 1.

[0051] In the embodiment, the through part 11 is a whole, which can be in the form of the circuit board 1 composed of two pieces, or in the form of the surface of the circuit board 1 locally thinned.

[0052] The through part 11 is one, which is convenient for manufacturing, and does not need to be aligned when assembling, so that the assembly efficiency is improved.

[0053] In some embodiments, as shown in Figure 5 , the through part 11 includes a plurality of strips extending in the same direction, and a gap part 12 is formed between adjacent through parts 11.

[0054] By forming the gap portion 12 between the adjacent through portions 11, the thickness of the gap portion 12 can be equal to the thickness of the circuit board 1 in the area other than the through portions 11, so that the overall strength of the circuit board 1 is higher.

[0055] In some embodiments, in combination Figure 6 As shown, the battery assembly includes a battery column 2, and the battery column 2 is stacked by a plurality of battery monomers 3 along a first direction;

[0056] The extension direction of the through portion 11 is parallel to the first direction;

[0057] A single through portion 11 corresponds to the explosion-proof valves 31 of at least two battery monomers 3; the length of the single through portion 11 is L2, and satisfies: 30mm 2 ≤d·L2≤600mm 2 .

[0058] In this embodiment, a single through portion 11 corresponds to the explosion-proof valves 31 of at least two battery monomers 3, so as to ensure the length of the single through portion 11, ensure the pressure relief space and the pressure relief rate. And because the length of the single through portion 11 is relatively long, the corresponding interval d can be appropriately reduced.

[0059] It should be noted that the length L of the through portion 11 includes the length L2 of the single through portion 11.

[0060] In some other embodiments, the battery assembly includes a battery column 2, and the battery column 2 is stacked by a plurality of battery monomers 3 along a first direction;

[0061] The extension direction of the through portion 11 is parallel to the first direction;

[0062] A single through portion 11 corresponds to the explosion-proof valves 31 of at least two battery monomers 3; the length of the single through portion 11 is L2, and satisfies: 30mm 2 ≤d·L2≤300mm 2 .

[0063] In this embodiment, a single through portion 11 corresponds to the explosion-proof valves 31 of at least two battery monomers 3, so as to ensure the length of the single through portion 11, ensure the pressure relief space and the pressure relief rate. And because the length of the single through portion 11 is relatively long, the corresponding interval d can be appropriately reduced.

[0064] In some embodiments, the battery assembly includes a battery column 2, and the battery column 2 is stacked by a plurality of battery monomers 3 along a first direction;

[0065] The extension direction of the through portion 11 is parallel to the first direction;

[0066] The length of the single through portion 11 is L2, and the length of the battery column 2 is E, satisfying 0.024≤L2 / E≤0.05.

[0067] Since the length E of the battery column 2 is relatively fixed, when the length L2 of the single through portion 11 is too long, the through portion 11 may be opened in a normal state due to vibration conditions and the like. When the length L2 of the single through portion 11 is too short, it is not conducive to normal pressure relief of the high-temperature medium.

[0068] In some embodiments, in combination with Figure 7 As shown, in the direction parallel to the first outer surface 32, the explosion-proof valve 31 is provided with a scored portion 312 close to the outer peripheral edge, and a reinforcing rib 311 is arranged on the side of the scored portion 312 away from the outer peripheral edge;

[0069] In the direction perpendicular to the first outer surface 32, the projection of the through portion 11 on the first outer surface 32 at least partially coincides with the reinforcing rib 311; satisfying 20mm 2 ≤d·L≤150mm 2 ; and satisfying 1mm≤d≤5mm.

[0070] The reinforcing rib 311 is arranged on the explosion-proof valve 31 to stabilize the opening pressure of the explosion-proof valve 31 and ensure that the explosion-proof valve 31 does not bend and deform before opening. When opening, the explosion-proof valve 31 on both sides of the extension direction of the reinforcing rib 311 is deformed and warped towards the direction of the high-temperature medium eruption, and the reinforcing rib position is usually strong and does not deform. The pressure relief channel is the part opened after warping, so when the projection of the through portion 11 on the first outer surface 32 at least partially coincides with the reinforcing rib 311, the part of the explosion-proof valve 31 located on the reinforcing rib 311 is difficult to produce a pressure relief channel due to the difficulty of deformation, and it is difficult to break through the corresponding area of the through portion 11, so the through portion 11 needs to be arranged longer to increase the pressure relief area to meet the pressure relief speed.

[0071] In some other embodiments, in combination with Figure 8 As shown, in the direction parallel to the first outer surface 32, the explosion-proof valve 31 is provided with a scored portion 312 close to the outer peripheral edge, and a reinforcing rib 311 is arranged on the side of the scored portion 312 away from the outer peripheral edge;

[0072] In the direction perpendicular to the first outer surface 32, the projection of the through portion 11 on the first outer surface 32 does not coincide with the reinforcing rib 311; satisfying 75mm 2 ≤d·L≤200mm 2 ; and satisfying 5mm≤d≤10mm.

[0073] Since the projection of the through portion 11 on the first outer surface 32 does not coincide with the reinforcing rib 311, the through portion 11 is directly opposite the pressure relief channel in the warping deformation, and is more easily broken open. The length of the corresponding through portion 11 can be appropriately set to be smaller.

[0074] In some embodiments, as shown in Figure 8 and Figure 9 shown, the reinforcing rib 311 is a line segment structure formed on the explosion-proof valve 31, and the reinforcing rib 311 includes a first end point 3111 and a second end point 3112 at both ends of the line segment. The extension direction of the reinforcing rib 311 is defined as the direction of the line connecting the first end point 3111 and the second end point 3112.

[0075] The extension direction of the reinforcing rib 311 is parallel to the extension direction of the through portion 11, and satisfies: 20mm 2 ≤d·L≤150mm 2 .

[0076] Since the extension direction of the reinforcing rib 311 is parallel to the extension direction of the through portion 11, the deformation probability in the extension direction of the reinforcing rib 311 is low, and it is not easy to provide a pressure relief space. The pressure relief space on both sides of the extension direction of the reinforcing rib 311 is not directly opposite the through portion 11, so the through portion 11 needs to be longer to avoid affecting the pressure relief speed.

[0077] In some other embodiments, as shown in Figure 7 shown, the reinforcing rib 311 is a line segment structure formed on the explosion-proof valve 31, and the reinforcing rib 311 includes a first end point 3111 and a second end point 3112 at both ends of the line segment. The extension direction of the reinforcing rib 311 is defined as the direction of the line connecting the first end point 3111 and the second end point 3112.

[0078] The extension direction of the reinforcing rib 311 is perpendicular to the extension direction of the through portion 11, and satisfies: 75mm 2 ≤d·L≤200mm 2 .

[0079] Since the extension direction of the reinforcing rib 311 is perpendicular to the extension direction of the through portion 11, the pressure relief space on both sides of the extension direction of the reinforcing rib 311 is directly opposite the through portion 11, so the through portion 11 is more easily opened, and the through portion 11 can be set to be smaller.

[0080] In some embodiments, as shown in Figure 10 shown, the length s of the reinforcing rib 311 is defined as the straight-line distance between the first end point 3111 and the second end point 3112.

[0081] Along the extension direction of the reinforcing rib 311, the distance between the edges on both sides of the notch portion 312 is t, and satisfies: s / t≥0.2, and satisfies: 15mm≤L≤20mm.

[0082] s / t represents the proportion of the length of the reinforcing rib 311 on the entire explosion-proof valve 31. When the length s of the reinforcing rib 311 is large, the explosion-proof valve 31 is safer and more controllable when it bursts, and can quickly break through the through part. Correspondingly, the length L of the through part 11 does not need to be set too long.

[0083] In some embodiments, the reinforcing rib 311 is a linear segment structure formed on the explosion-proof valve 31, and the linear segment is an arc line.

[0084] When the linear segment structure is used as a reinforcing rib, the arc line has greater strength than a straight line, which is more conducive to maintaining the overall strength of the explosion-proof valve 31 and making the explosion-proof valve 31 safer and more controllable when it bursts.

[0085] As a variation, the linear segment of the reinforcing rib 311 can also be a straight line.

[0086] In some embodiments, as shown in Figure 11 , Figure 12 , the reinforcing rib 311 is a linear segment structure formed on the explosion-proof valve 31, and the reinforcing rib 311 includes two intersecting first reinforcing rib segments 3101 and second reinforcing rib segments 3102.

[0087] By making the reinforcing rib 311 include two intersecting first reinforcing rib segments 3101 and second reinforcing rib segments 3102, the intersecting reinforcing rib 311 has a better reinforcing effect, and the entire explosion-proof valve 31 is more stable and controllable.

[0088] In other embodiments, as shown in Figure 10 , the reinforcing rib 311 is a linear segment structure formed on the explosion-proof valve 31, and the reinforcing rib 311 includes two non-intersecting first reinforcing rib segments 3101 and second reinforcing rib segments 3102. The minimum distance f between the first reinforcing rib segment 3101 and the second reinforcing rib segment 3102 satisfies 0.1mm≤f≤5mm, and satisfies 15mm≤L≤20mm.

[0089] When the reinforcing rib 311 includes two non-intersecting first reinforcing rib segments 3101 and second reinforcing rib segments 3102, if the distance between the two reinforcing rib segments is too large, the explosion-proof valve 31 can still easily bulge and deform at the distance, making the entire explosion-proof valve 31 unstable. Therefore, the minimum distance between the first reinforcing rib segment 3101 and the second reinforcing rib segment 3102 needs to be controlled. When the distance f is satisfied, the length L of the through part 11 can be appropriately reduced.

[0090] In some embodiments, as shown in Figure 13 , the reinforcing rib 311 is a linear segment structure formed on the explosion-proof valve 31, and the reinforcing rib 311 includes a first reinforcing rib segment 3101, a second reinforcing rib segment 3102, and a third reinforcing rib segment 3103.

[0091] By setting more reinforcing rib segments, the reinforcing effect of the reinforcing rib 311 can be further improved, and the entire explosion-proof valve 31 is more stable and controllable.

[0092] In some embodiments, in combination with Figure 12 As shown, the reinforcing rib 311 is in communication with the scored portion 312 in at least a partial region; and satisfies: 20mm≤L≤30mm.

[0093] When the reinforcing rib 311 is in communication with the scored portion 312 in at least a partial region, the forming mode of the reinforcing rib 311 can be the same as that of the scored portion 312, for example, both can be stamping out indentations on the explosion-proof valve 31, except that the scored portion 312 is thinned more and the residual thickness is smaller; and the reinforcing rib 311 is only slightly thinned at the position of the line segment.

[0094] Since stamping out indentations on the explosion-proof valve 31 will cause the overall three-dimensional thickness of the explosion-proof valve 31 to increase, thereby playing a reinforcing role, if the reinforcing rib 311 intersects with the scored portion 312, the intersection is prone to stress concentration and premature breakage, and since the opening pressure has not been reached when premature breakage occurs, the through portion 11 is not easy to be broken by the high-temperature medium under small pressure, so the length of the through portion 11 needs to be larger to reduce the opening difficulty of the through portion 11.

[0095] In some embodiments, in combination with Figure 10 、 Figure 11 As shown, the reinforcing rib 311 is in communication with the scored portion 312 in at least a partial region; and satisfies: 20mm≤L≤30mm.

[0096] When the reinforcing rib 311 is in communication with the scored portion 312 in at least a partial region, the scored portion 312 is uniformly thinned, the overall opening pressure of the explosion-proof valve 31 is more stable, and the opening is more controllable; when the minimum distance between the reinforcing rib and the score is too large, it indicates that the overall reinforcing rib 311 is small and the reinforcing effect is insufficient; and when the minimum distance between the reinforcing rib and the score is too small, it indicates that the overall size of the reinforcing rib 311 is sufficient, the explosion-proof valve 31 is more stable and controllable, and can normally open under the opening pressure, at which time the through portion 11 can be set smaller.

[0097] According to the embodiments of the present application, on the other hand, a battery pack is also provided, comprising: the battery assembly as described above.

[0098] Obviously, the above embodiments are only examples for clearly illustrating, and are not a limitation on the embodiments. Although the embodiments of the present application are described in combination with the drawings, those 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 present application.

Claims

1. A battery assembly, comprising: The battery assembly comprises a battery cell (3) having a first outer surface (32) provided with an explosion-proof valve (31); a circuit board (1) located on the side of the battery cell (3) provided with the explosion-proof valve (31) and arranged in parallel and spaced apart from the first outer surface (32); in a direction perpendicular to the first outer surface (32), the projection of the circuit board (1) on the first outer surface (32) at least partially coincides with the explosion-proof valve (31); the circuit board (1) is formed with a through portion (11) adapted to be closed under normal pressure and opened under a preset pressure; the through portion (11) comprises a plurality of through portions extending in the same direction, and a gap portion (12) is formed between adjacent through portions (11); the battery assembly comprises a battery column (2) stacked by a plurality of battery cells (3) in a first direction; the extension direction of the through portion (11) is parallel to the first direction; the length of a single through portion (11) is L2, and the length of the battery column (2) is E, satisfying 0.024≤L2 / E≤0.05; in a direction parallel to the first outer surface (32), the explosion-proof valve (31) is provided with a notched portion (312) near the outer peripheral edge, and a reinforcing rib (311) is arranged on the side of the notched portion (312) away from the outer peripheral edge; in a direction perpendicular to the first outer surface (32), the projection of the through portion (11) on the first outer surface (32) at least partially coincides with the reinforcing rib (311), satisfying 1mm≤d≤5mm. The circuit board (1) comprises a first circuit board body (101) and a second circuit board body (102), one side edge of the first circuit board body (101) is arranged in abutment with one side edge of the second circuit board body (102), and the through portion (11) is formed at the abutment joint of the first circuit board body (101) and the second circuit board body (102). The through portion (11) is one, and is continuously arranged on the circuit board (1). In a direction perpendicular to the first outer surface (32), a distance between a surface of the explosion-proof valve (31) on a side toward the circuit board (1) and a surface of the circuit board (1) on a side toward the explosion-proof valve (31) is d, and a length of the through portion (11) is L, and the following is satisfied: 15 mm 2 ≤ d · L ≤ 20,000 mm 2 ; The battery assembly comprises a battery column (2) stacked by a plurality of battery cells (3) in a first direction; the extension direction of the through portion (11) is parallel to the first direction; the battery assembly comprises a battery column (2) stacked by a plurality of battery cells (3) in a first direction; the extension direction of the through portion (11) is parallel to the first direction; the reinforcing rib (311) is a line segment structure formed on the explosion-proof valve (31), and comprises a first end point (3111) and a second end point (3112) at both ends of the line segment; the extension direction of the reinforcing rib (311) is defined as the direction of the line connecting the first end point (3111) and the second end point (3112). ​ ​ ​ ​ ​ 2. The battery assembly of claim 1, wherein, The circuit board (1) includes a first circuit board body (101) and a second circuit board body (102), the first circuit board body (101) and the second circuit board body (102) at least partially overlap to form an overlapping region (13), the through portion (11) is formed at the overlapping joint of the first circuit board body (101) and the second circuit board body (102); meet: 75mm 2 ≤d·L≤20000mm 2 ; and meet: 5mm≤d≤10mm.

3. The battery assembly of claim 1, wherein, ​ 4. The battery assembly of claim 1, wherein, The through portion (11) is formed by thinning at least a partial region of a surface of the circuit board (1); and satisfies: 15 mm 2 ≤ d · L ≤ 20,000 mm 2 ; and satisfies: 1 mm ≤ d ≤ 5 mm.

5. The battery assembly of claim 1, wherein, ​ 6. The battery assembly of claim 1, wherein, ​ ​ A single through portion (11) corresponds to the explosion-proof valves (31) of at least two battery monomers (3) at the same time; the length of a single through portion (11) is L2, which satisfies: 30mm 2 ≤d·L2≤600mm 2 .

7. The battery assembly of claim 1, wherein, ​ ​ A single through portion (11) corresponds to an explosion-proof valve (31) of one battery monomer (3); the length of a single through portion (11) is L2, which satisfies: 15mm 2 ≤d·L2≤300mm 2 .

8. The battery assembly of claim 1, wherein, Satisfies: 20 mm 2 ≤ d · L ≤ 150 mm 2 .

9. The battery assembly of claim 1, wherein, ​ The extension direction of the reinforcing rib (311) is parallel to the extension direction of the through portion (11), and satisfies: 20 mm 2 ≤ d · L ≤ 150 mm 2 .

10. The battery assembly of claim 1, wherein, The reinforcing rib (311) is a line segment structure formed in the explosion-proof valve (31), the reinforcing rib (311) includes a first end point (3111) and a second end point (3112) at both ends of the line segment; the extension direction of the reinforcing rib (311) is defined as the direction of the line connecting the first end point (3111) and the second end point (3112); The reinforcing rib (311) extends in a direction perpendicular to the extension direction of the through portion (11) and satisfies: 75 mm 2 ≤ d · L ≤ 200 mm 2 .

11. The battery assembly of claim 10, wherein, The length s of the reinforcing rib (311) is defined as the straight-line distance between the first end point (3111) and the second end point (3112); The distance between the edges of the two sides of the score portion (312) along the extension direction of the reinforcing rib (311) is t, which satisfies s / t≥0.2, and satisfies 15mm≤L≤20mm.

12. The battery assembly of claim 1, wherein, The reinforcing rib (311) is a line segment structure formed in the explosion-proof valve (31), and the line segment is an arc line.

13. The battery assembly of claim 1, wherein, The reinforcing rib (311) is a line segment structure formed in the explosion-proof valve (31), and the reinforcing rib (311) includes two intersecting first reinforcing rib segments (3101) and second reinforcing rib segments (3102).

14. The battery assembly of claim 1, wherein, The reinforcing rib (311) is a line segment structure formed in the explosion-proof valve (31), and the reinforcing rib (311) includes two non-intersecting first reinforcing rib segments (3101) and second reinforcing rib segments (3102), the minimum distance between the first reinforcing rib segments (3101) and the second reinforcing rib segments (3102) is f, which satisfies 0.1mm≤f≤5mm, and satisfies 15mm≤L≤20mm.

15. The battery assembly of claim 1, wherein, The reinforcing rib (311) is a line segment structure formed in the explosion-proof valve (31), and the reinforcing rib (311) includes first reinforcing rib segments (3101), second reinforcing rib segments (3102), and third reinforcing rib segments (3103).

16. The battery assembly of claim 1, wherein, The reinforcing rib (311) is at least partially connected with the score portion (312); and satisfies 20mm≤L≤30mm.

17. The battery assembly of claim 1, wherein, The reinforcing rib (311) is not in contact with the score portion (312), and the minimum distance between the reinforcing rib (311) and the score portion (312) is j, which satisfies 0.1mm≤j≤2mm, and satisfies 15mm≤L≤20mm.

18. A battery pack, characterized by The battery assembly includes any one of the battery assemblies according to claims 1-17.

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