Battery modules and battery packs

Abstract

The present invention relates to a battery module and a battery pack. The battery module includes: a secondary battery, a plurality of secondary batteries are arranged side by side, and the secondary battery has an explosion-proof valve; a monitoring component, the monitoring component is arranged above the secondary battery, the monitoring component includes a substrate and a monitoring wire, and the monitoring wire is connected to the substrate; the monitoring wire is arranged corresponding to the position of each explosion-proof valve; when any explosion-proof valve explodes, the monitoring wire can be disconnected to realize the monitoring of the battery module status. The battery module of the embodiment of the present invention can monitor the secondary battery in real time, and when the secondary battery has thermal runaway, it can timely feedback the explosion signal to improve the safety of the battery module during use.

Description

Technical Field

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

[0002] At present, as the energy density in secondary batteries is getting higher and higher, the market demand for battery safety is getting higher and higher. Thermal runaway may occur during the use of secondary batteries, resulting in a local high temperature environment, which has great destructive power. In severe cases, it may burn through the upper cover of the battery box and cause a fire. However, since thermal runaway of secondary batteries cannot be detected in time, it will cause great safety accidents. Summary of the invention

[0003] The embodiments of the present invention provide a battery module and a battery pack, which can monitor a secondary battery in real time, and timely feedback an explosion signal when a thermal runaway occurs in the secondary battery, thereby improving the safety of the battery module during use.

[0004] On the one hand, an embodiment of the present invention provides a battery module, which includes:

[0005] A secondary battery, a plurality of secondary batteries are arranged side by side, and the secondary battery has an explosion-proof valve;

[0006] The monitoring component is arranged above the secondary battery. The monitoring component includes a substrate and a monitoring wire, which is connected to the substrate. The monitoring wire is arranged corresponding to the position of each explosion-proof valve. When any explosion-proof valve explodes, the monitoring wire can be disconnected to realize the monitoring of the battery module status.

[0007] According to one aspect of the embodiments of the present invention, the monitoring wire has a first section and a second section spaced apart along the width direction of the substrate, the minimum spacing between the first section and the second section is H, the outer diameter of the monitoring wire is D, wherein H / D≥2.5.

[0008] According to one aspect of the embodiments of the present invention, the monitoring wire is in a U-shaped structure.

[0009] According to one aspect of the embodiment of the present invention, the explosion-proof valve has a center line extending along the length direction of the substrate, and the first section and the second section are respectively arranged on both sides of the center line.

[0010] According to one aspect of the embodiments of the present invention, the outer diameter D of the monitoring wire is 0.1 mm ≤ D ≤ 2 mm, and the minimum spacing H between the first section and the second section is 5 mm ≤ H ≤ 50 mm.

[0011] According to one aspect of the embodiment of the present invention, a receiving portion is provided on the substrate, the monitoring wire is arranged in the receiving portion, and the shape of the monitoring wire matches the shape of the receiving portion.

[0012] According to one aspect of the embodiments of the present invention, the accommodation portion is a groove sunken along the thickness direction of the substrate, and the bottom wall of the groove does not penetrate the substrate.

[0013] According to one aspect of the embodiments of the present invention, the accommodation portion penetrates the substrate along the thickness direction of the substrate, the maximum dimension of the monitoring wire along the thickness direction is smaller than the thickness of the substrate, and the monitoring wire is arranged in the accommodation portion.

[0014] According to one aspect of an embodiment of the present invention, the monitoring assembly further includes an insulating layer wrapping the monitoring wire, the insulating layer fills the accommodating portion, and the monitoring wire is connected to the substrate through the insulating layer.

[0015] According to one aspect of the embodiments of the present invention, the thickness of the insulating layer is M, and the maximum outer diameter of the monitoring wire is D, wherein 0.05≤M / D≤10.

[0016] According to one aspect of the embodiment of the present invention, the thickness of the portion of the insulating layer disposed below the monitoring wire is M along the thickness direction.

[0017] According to one aspect of the embodiments of the present invention, the thickness of the insulating layer is M, wherein 0.1 mm≤M≤1 mm.

[0018] According to one aspect of the embodiments of the present invention, the monitoring assembly further includes a protection plate, and the protection plate is disposed on a side of the substrate close to the secondary battery along the thickness direction of the substrate.

[0019] According to one aspect of the embodiments of the present invention, the monitoring assembly further includes an isolation plate, and the isolation plate is disposed on a side of the substrate away from the secondary battery along the thickness direction of the substrate.

[0020] The battery module according to the embodiment of the present invention can realize real-time monitoring of the status of the secondary battery by setting a monitoring component. The monitoring component includes a substrate and a monitoring wire. The monitoring wire itself constitutes a complete circuit. When the secondary battery explodes and sprays high-temperature substances, the monitoring wire included in the monitoring component is fused or broken and disconnected. At this time, the internal monitoring wire can no longer transmit electrical signals, thereby timely feedback of the signal of the explosion of the secondary battery, so as to take safety intervention measures for the battery module in time to timely curb the spread of high-temperature substances in the explosion of the secondary battery, and improve the safety of the battery module during use.

[0021] In another aspect, a battery pack is provided according to an embodiment of the present invention, comprising the battery module as described in the above embodiment.

[0022] According to another aspect of the embodiment of the present invention, the number of battery modules is more than two, and the monitoring wires included in each of the more than two battery modules are connected in series.

[0023] In another aspect, a battery pack is provided according to an embodiment of the present invention, comprising:

[0024] A battery cell; a cover body, arranged above the battery cell; a monitoring component, the monitoring component is arranged on the cover body, the monitoring component includes a substrate and a monitoring wire, and the monitoring wire is connected to the substrate; when the battery cell explodes, the monitoring wire can be disconnected to realize the monitoring of the battery cell status. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Features, advantages, and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

[0026] Figure 1 is a schematic diagram of the exploded structure of a battery module according to an embodiment of the present invention;

[0027] Figure 2 is a schematic diagram of the structure of a monitoring component according to an embodiment of the present invention;

[0028] Figure 3 is a schematic structural diagram of a monitoring component according to another embodiment of the present invention;

[0029] Figure 4 is a schematic structural diagram of a monitoring component according to yet another embodiment of the present invention;

[0030] Figure 5 is a schematic cross-sectional structural diagram of a battery module according to an embodiment of the present invention;

[0031] Figure 6 yes Figure 5 Enlarged view of point A in the middle;

[0032] Figure 7 is a partial cross-sectional structural schematic diagram of a battery module according to an embodiment of the present invention;

[0033] Figure 8 is a schematic cross-sectional structural diagram of a battery module according to another embodiment of the present invention;

[0034] Fig. 9 yes Figure 8 Enlarged view of point B in the middle;

[0035] Fig.10 is a schematic diagram of the exploded structure of a battery pack according to an embodiment of the present invention;

[0036] Fig.11 is a schematic diagram of the exploded structure of a battery pack according to another embodiment of the present invention;

[0037] Fig.12 It is a schematic diagram of the connection status of a cover body and a monitoring component according to an embodiment of the present invention.

[0038] In the drawings, the drawings are not drawn to scale.

[0039] Marking Description:

[0040] 1. Battery module;

[0041] 11. secondary battery; 11a. center line; 111. explosion-proof valve;

[0042] 12. Monitoring assembly; 121. Base plate; 121a. Accommodation portion; 122. Monitoring wire; 122a. First section; 122b. Second section; 122c. Intermediate transition section; 123. Insulation layer;

[0043] 13. Protective plate;

[0044] 14. Isolation board;

[0045] 2. Battery pack;

[0046] 21. Box body;

[0047] 22. Cover body;

[0048] 3. Battery pack;

[0049] 31. Battery unit;

[0050] X, width direction; Y, thickness direction; Z, length direction. DETAILED DESCRIPTION

[0051] The following detailed description of the embodiments of the present invention is provided in conjunction with the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present invention, but cannot be used to limit the scope of the present invention, that is, the present invention is not limited to the described embodiments.

[0052] In the description of the present invention, it should be noted that, unless otherwise specified, the meaning of "plurality" is more than two; the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0053] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the present invention. In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0054] In order to better understand the present invention, Figures 1 to 12 The embodiments of the present invention are described in detail.

[0055] On the one hand, see Figure 1 As shown, an embodiment of the present invention provides a battery module 1, which includes a plurality of secondary batteries 11 and a monitoring component 12. A plurality of secondary batteries 11 are arranged side by side to form a battery pack. Each secondary battery 11 has an explosion-proof valve 111. When the internal pressure of the secondary battery 11 exceeds a predetermined pressure, the explosion-proof valve 111 will explode to release the pressure, and high-temperature substances will be ejected at the same time, such as high-temperature gas or high-temperature electrolyte. In one example, the secondary battery 11 is a square battery. The shape of the explosion-proof valve 111 is circular or runway-shaped.

[0056] The monitoring assembly 12 of this embodiment is disposed above the secondary battery 11. Figures 2 to 4 As shown, the monitoring assembly 12 includes a substrate 121 and a monitoring wire 122. The monitoring wire 122 is connected to the substrate 121, so that the substrate 121 provides a supporting force for the monitoring wire 122, thereby reducing the possibility that the position of the monitoring wire 122 moves downward and is electrically connected to the secondary battery 11. The monitoring wire 122 is arranged corresponding to the position of each explosion-proof valve 111. Under normal conditions, the monitoring wire 122 itself constitutes a complete electrical circuit. When any explosion-proof valve 111 explodes, the high temperature or impact force generated by the explosion can act on the monitoring wire 122, so that the monitoring wire 122 is melted or cut off by shear force, so that the monitoring wire 122 is disconnected, thereby realizing the monitoring of the state of the battery module 1.

[0057] The battery module 1 of the embodiment of the present invention realizes real-time monitoring of the working state of the secondary battery 11 by setting a monitoring component 12. When the secondary battery 11 explodes, the monitoring wire 122 in the monitoring component 12 is disconnected when subjected to high temperature or large impact force, thereby timely feeding back the signal of the explosion of the secondary battery 11, so as to take safety intervention measures for the battery module 1 in time, and timely curb the spread of the high-temperature material of the explosion of the secondary battery 11, and at the same time, it can also serve as a warning to personnel, thereby improving the safety of the battery module 1 during use.

[0058] In one embodiment, the battery module 1 also includes a battery management system (BMS). The monitoring wire 122 has two connection ends. The two connection ends are respectively connected to the positive terminal and the negative terminal of the battery management system. Under normal conditions, the monitoring wire 122 is energized so that current flows through it. When the monitoring wire 122 is disconnected and is in an open circuit state, the current flowing through the monitoring wire 122 will be cut off. After the battery management system detects the current change signal, it determines that the secondary battery 11 has exploded, and automatically intervenes in time or sends an alarm signal to the outside.

[0059] In one embodiment, the number of the secondary batteries 11 may be 2 to 50. Three or more secondary batteries 11 are electrically connected in series or in series-parallel combination.

[0060] In one embodiment, the substrate 121 may be a mica plate, which is brittle and easy to break when subjected to a large impact force. The substrate 121 may also be a plastic plate, which is easy to melt when subjected to high temperature and easy to break when subjected to a large impact force. In this way, when the secondary battery 11 explodes, the substrate 121 has a small blocking effect on the high-temperature substance, ensuring that the high-temperature substance acts more on the monitoring wire 122 to quickly disconnect the monitoring wire 122. The substrate 121 has a predetermined length, a predetermined width, and a predetermined thickness. In various embodiments, the width direction X of the substrate 121 is the direction corresponding to the width, the thickness direction Y of the substrate 121 is the direction corresponding to the thickness, and the length direction Z of the substrate 121 is the direction corresponding to the length. Optionally, the thickness of the substrate 121 is 0.5 mm to 2 mm.

[0061] In one embodiment, see Figure 4 As shown, the monitoring conductor 122 has a first section 122a and a second section 122b that are spaced apart along the width direction X. The monitoring conductor 122 also includes an intermediate transition section 122c connecting the first section 122a and the second section 122b. The first section 122a and the second section 122b are arranged corresponding to the positions of each explosion-proof valve 111. When the secondary battery 11 explodes, high-temperature substances can be ejected from the explosion-proof valve 111 and act on the first section 122a and / or the second section 122b to disconnect the first section 122a and / or the second section 122b. The first section 122a and the second section 122b can be redundant with each other, so that when the first section 122a is not disconnected, the second section 122b is disconnected to achieve the monitoring function, or, when the second section 122b is not disconnected, the first section 122a is disconnected to achieve the monitoring function. In one example, the minimum spacing between the first section 122a and the second section 122b is H (see Figure 4 As shown), the outer diameter of the monitoring wire 122 is D (see Figure 6As shown), where H / D≥2.5. The minimum spacing refers to the minimum value of all spacing values ​​between the first section 122a and the second section 122b measured along the straight line X in the width direction. When H / D is less than 2.5, the minimum spacing between the first section 122a and the second section 122b is too small. In this way, when the first section 122a and / or the second section 122b melt due to high temperature, there is a possibility that the molten material of the melted first section 122a and / or the second section 122b flows to each other, thereby causing the first section 122a and / or the second section 122b to restore electrical connection after the fuse, thereby causing the monitoring function of the monitoring wire 122 to fail, and it is impossible to normally feedback the signal that the secondary battery 11 has exploded. In addition, if the minimum spacing between the first section 122a and the second section 122b is too small, the creepage distance between the first section 122a and the second section 122b will be too short, so that the first section 122a and the second section 122b are easy to break through and connect, affecting normal monitoring.

[0062] In one example, the material of the monitoring conductor 122 may be aluminum, copper, tin, or the like. The cross-section of the monitoring conductor 122 may be circular or polygonal. The outer diameter of the monitoring conductor 122 is D, where 0.1 mm ≤ D ≤ 2 mm. The outer diameter of the monitoring conductor 122 refers to the length of a straight line drawn through the center of the monitoring conductor 122 on the cross-section of the monitoring conductor 122. When the cross-section of the monitoring conductor 122 is circular, the outer diameter refers to the diameter of the monitoring conductor 122. When the cross-section of the monitoring conductor 122 is polygonal, the outer diameter refers to the maximum outer diameter, that is, the length of the longest straight line passing through the center of the cross-section. When the outer diameter of the monitoring conductor 122 is less than 0.1 mm, its own impact resistance is low, and it is easily broken by external impact force during installation, thereby causing the monitoring conductor 122 to fail and fail to realize the function of monitoring the secondary battery 11. When the outer diameter of the monitoring wire 122 is greater than 2 mm, the monitoring wire 122 itself has too high resistance to high temperature and impact force, so it is difficult to be melted by high-temperature materials or broken by external impact force, thereby reducing the monitoring sensitivity, resulting in the monitoring wire 122 being unable to realize the function of monitoring the secondary battery 11 by breaking the circuit. At the same time, the outer diameter of the monitoring wire 122 greater than 2 mm will occupy more installation space, thereby reducing the energy density of the battery module 1. The minimum spacing H between the first section 122a and the second section 122b, where 5mm≤H≤50mm. When the minimum spacing H is less than 5mm, the minimum spacing between the first section 122a and the second section 122b is too small. In this way, when the first section 122a and / or the second section 122b melt due to high temperature, there is a possibility that the molten material flows to each other in the melted first section 122a and / or the second section 122b, thereby causing the first section 122a and / or the second section 122b to restore electrical connection after the melt, thereby causing monitoring failure. In addition, if the minimum spacing between the first section 122a and the second section 122b is too small, the creepage distance between the first section 122a and the second section 122b will be too short, so that the first section 122a and the second section 122b are easily broken through and connected to each other, affecting the normal monitoring function of the monitoring wire 122. When the minimum spacing H is greater than 50mm, the spacing between the first section 122a and the second section 122b is too large, so that the first section 122a and the second section 122b are far away from the center of the explosion-proof valve 111, and there is a possibility that the impact force of the high-temperature material ejected from the explosion directly on the first section 122a and the second section 122b will be weakened, and there is also a possibility that the high-temperature material is cooled down due to the long transmission distance, so that the temperature when acting on the first section 122a and the second section 122b is low. In this way, the first section 122a and the second section 122b are difficult to be melted by the high-temperature material or broken by the external impact force, resulting in the failure of the monitoring wire 122, and the function of monitoring the secondary battery 11 cannot be realized by disconnection.

[0063] In one embodiment, see Figure 1As shown, the explosion-proof valve 111 has a center line 11a extending along the length direction Z of the substrate 121. The first section 122a and the second section 122b are respectively arranged on both sides of the center line 11a. Optionally, the first section 122a and the second section 122b of the monitoring wire 122 extend along the length direction Z. In one example, the monitoring wire 122 has a U-shaped structure. A linear measurement is performed along the width direction X, and the spacing between the first section 122a and the second section 122b measured at each position is equal. In one example, the first section 122a and the second section 122b have the same structure and are arranged in parallel. In another example, the first section 122a and the second section 122b are each inclined in a direction away from each other so that the spacing between the two gradually decreases or increases along the length direction Z.

[0064] In one embodiment, the number of monitoring wires 122 of this embodiment may be more than two. More than two monitoring wires 122 are arranged side by side in one direction, and all are arranged relative to the explosion-proof valve 111. More than two monitoring wires 122 are redundant with each other. When the secondary battery 11 explodes, any one of the more than two monitoring wires 122 can monitor the state of the secondary battery 11, which is beneficial to improve the monitoring accuracy. When any one of the more than two monitoring wires 122 fails to monitor or does not work properly, the remaining monitoring wires 122 can complete the monitoring work normally, thereby reducing the possibility of missed judgment.

[0065] In one embodiment, see Figure 2 As shown, the monitoring wire 122 is directly disposed on the surface of the substrate 121. The surface where the substrate 121 and the monitoring wire 122 are connected is a flat surface. The two are connected and fixed by snapping or bonding. Figure 3 As shown, a receiving portion 121a is provided on the substrate 121. The monitoring wire 122 is arranged in the receiving portion 121a. The overall shape of the monitoring wire 122 matches the shape of the receiving portion 121a. When the monitoring wire 122 is a U-shaped structure, the receiving portion 121a is also a U-shaped structure. The receiving portion 121a is arranged corresponding to the position of the explosion-proof valve 111. The monitoring wire 122 is accommodated in the receiving portion 121a, which, on the one hand, is conducive to improving the compactness of the structure, saving space, and improving the energy density of the battery module 1. On the other hand, the monitoring wire 122 is constrained by the insulating plate, which improves its own position stability, reduces the possibility that the position of the monitoring wire 122 is offset and cannot maintain a corresponding state with the position of the explosion-proof valve 111, and reduces the possibility that high-temperature substances cannot act on the offset monitoring wire 122 and cause monitoring failure.

[0066] In one embodiment, see Figure 5 and Figure 6As shown, the accommodating portion 121a penetrates the substrate 121 along the thickness direction Y of the substrate 121. The accommodating portion 121a extends along the length direction Z. The monitoring wire 122 directly corresponds to the explosion-proof valve 111 of the secondary battery 11. When the secondary battery 11 explodes, the internal high-temperature material can directly act on the monitoring wire 122, and quickly cause the monitoring wire 122 to fuse or be broken by an external impact force, so that the monitoring wire 122 is in a disconnected state, which is beneficial to shorten the monitoring time. The maximum dimension of the monitoring wire 122 along the thickness direction Y is smaller than the thickness of the substrate 121, and the monitoring wire 122 is arranged in the accommodating portion 121a. Along the thickness direction Y, the monitoring wire 122 is not exposed to the substrate 121, so that the substrate 121 can protect the monitoring wire 122, reducing the possibility of the monitoring wire 122 being accidentally broken by external force during the assembly process or later use. In addition, the monitoring wire 122 will not occupy more installation space in the thickness direction Y, thereby improving the overall structural compactness of the monitoring component 12, which is beneficial to improving the energy density of the battery module 1.

[0067] In another embodiment, see Figure 7 As shown, the accommodating portion 121a is a groove sunken along the thickness direction Y of the substrate 121. The bottom wall of the groove does not penetrate the substrate 121. The substrate 121 can provide supporting force for the monitoring wire 122 along the thickness direction Y. When the battery module 1 vibrates during use, the monitoring wire 122 is not easy to fall out of the groove. The substrate 121 of this embodiment will melt itself under high temperature or break under impact force. In one example, the groove extends in a straight line along the length direction Z to form a strip groove. The monitoring wire 122 is also in a strip-shaped structure as a whole, so as to match the shape of the groove.

[0068] In one embodiment, see Figure 8 and Fig. 9 As shown, the monitoring assembly 12 also includes an insulating layer 123 that wraps the monitoring wire 122. The insulating layer 123 is filled in the accommodating portion 121a. The monitoring wire 122 is connected to the substrate 121 through the insulating layer 123. When the explosion-proof valve 111 explodes, the insulating layer 123 can be melted or broken. The insulating layer 123 can ensure that the monitoring wire 122 is insulated and isolated from the adjacent energized structural parts, reducing the possibility of the monitoring wire 122 contacting the adjacent energized structural parts and causing a short circuit. The insulating layer 123 can fill the gap between the monitoring wire 122 and the substrate 121, thereby improving the positional stability of the monitoring wire 122. The insulating layer 123 can reduce the possibility of a breakdown short circuit between the first section 122a and the second section 122b. When the secondary battery 11 explodes, the high-temperature substance can first melt or break to expose the internal monitoring wire 122, and then the high-temperature substance will melt or break the monitoring wire 122.

[0069] In one embodiment, the thickness of the insulating layer 123 is M, and the maximum outer diameter of the monitoring wire 122 is D, wherein 0.05≤M / D≤10. When M / D is less than 0.05, the thickness of the insulating layer 123 is too thin, the insulation performance deteriorates, and the possibility of insulation failure increases. When M / D is greater than 10, the thickness of the insulating layer 123 is too thick, so that when the explosion-proof valve 111 explodes, the high-temperature material is easily blocked by the insulating layer 123, and it is not easy to quickly melt or break the insulating layer 123, which prolongs the monitoring time of the monitoring wire 122. In one example, the thickness value measured at any position of the insulating layer 123 is M. In another example, along the thickness direction Y, the thickness of the portion of the insulating layer 123 disposed below the monitoring wire 122 along the thickness direction Y is M. Along the thickness direction Y, a linear measurement is made on the portion of the insulating layer 123 disposed below the monitoring wire 122 to obtain the thickness value M.

[0070] In one embodiment, the thickness of the insulating layer 123 is M, where 0.1 mm ≤ M ≤ 1 mm. The material of the insulating layer 123 may be a polymer material such as polyethylene, polypropylene or polyester, or ceramic or mica. The thickness of the insulating layer 123 may be 0.1 mm to 1 mm. The insulation performance of the insulating layer 123 is greater than 500 MΩ. When the thickness of the insulating layer 123 is less than 0.1 mm, the insulation performance will be reduced, thereby increasing the possibility of the first section 122a and the second section 122b being broken down and short-circuited, resulting in false alarms and reducing the monitoring accuracy. When the thickness of the insulating layer 123 is greater than 1 mm, the difficulty of melting or breaking the insulating layer 123 increases, so that when the secondary battery 11 explodes, the insulating layer 123 fails to melt or break to expose the monitoring wire 122, which in turn causes the first section 122a and the second section 122b to fail to be disconnected, so that the monitoring cable group cannot complete the monitoring work normally, and cannot determine the state of the secondary battery 11 having exploded.

[0071] In one embodiment, see Figure 6 or Figure 7 As shown, the monitoring component 12 also includes a protective plate 13. Along the thickness direction Y of the substrate 121, the protective plate 13 is arranged on the side of the substrate 121 close to the secondary battery 11. The protective plate 13 can provide additional protection. When the secondary battery 11 explodes, the protective plate 13 can block the high-temperature substances from diffusing outward, thereby improving the safety of the battery module 1. The protective plate 13 can be connected and fixed to the substrate 121, and the substrate 121 and the protective plate 13 are stacked along the thickness direction Y. Optionally, the protective plate 13 is made of a high-temperature resistant and high-strength insulating material such as mica, ceramic, and a composite material. Optionally, the substrate 121 and the protective plate 13 are bonded by a high-temperature resistant adhesive such as silicone glue, high-temperature epoxy glue, silicone, phenolic, or the like.

[0072] In one embodiment, see Figure 6or Figure 7 As shown, the monitoring component 12 also includes an isolation plate 14. Along the thickness direction Y of the substrate 121, the isolation plate 14 is arranged on the side of the substrate 121 away from the secondary battery 11. The isolation plate 14 isolates the secondary battery 11 and the monitoring component 12. The isolation plate 14 can be connected and fixed to the substrate 121, and the substrate 121 and the protective plate 13 are stacked along the thickness direction Y. When the secondary battery 11 explodes, the high-temperature substance first melts or breaks the isolation plate 14, and then melts or breaks the monitoring wire 122. Optionally, the isolation plate 14 is made of an insulating material such as mica or plastic. Optionally, the substrate 121 and the isolation plate 14 are bonded by a high-temperature resistant adhesive such as silicone glue, high-temperature epoxy glue, silicone, phenolic resin, etc.

[0073] The battery module 1 of the embodiment of the present invention can realize real-time monitoring of the status of the secondary battery 11 by setting a monitoring component 12. The monitoring component 12 includes a substrate 121 and a monitoring wire 122. The monitoring wire 122 itself constitutes a complete circuit. When the secondary battery 11 explodes and sprays high-temperature substances, the monitoring wire 122 included in the monitoring component 12 is melted or broken and disconnected. At this time, the monitoring wire 122 can no longer transmit electrical signals, thereby timely feeding back the signal that the secondary battery 11 has exploded, so as to take safety intervention measures for the battery module 1 in time to timely curb the spread of high-temperature substances that exploded from the secondary battery 11, thereby improving the safety of the battery module 1 during use.

[0074] See also Fig.10 As shown, an embodiment of the present invention further provides a battery pack 2, which includes the battery modules 1 of the above-mentioned embodiments. In one embodiment, the number of battery modules 1 is more than two. The monitoring wires 122 included in each of the more than two battery modules 1 are connected in series. After all the monitoring wires 122 are connected in series, they are connected to the positive terminal and the negative terminal of the battery management system through the total input terminal and the total output terminal, so as to monitor each battery module 1 in real time.

[0075] The battery pack 2 of the embodiment of the present invention can monitor the status of the battery module 1 in real time through the monitoring component 12. When the secondary battery 11 explodes and sprays high-temperature substances, the monitoring wire 122 included in the monitoring component 12 is fused or broken and disconnected. At this time, the monitoring wire 122 can no longer transmit electrical signals, so as to timely feedback the signal of the explosion of the battery module 1, so as to take safety intervention measures for the battery pack 2 in time to timely curb the spread of the high-temperature substances sprayed from the battery module 1, and improve the safety of the battery pack 2 during use.

[0076] In one embodiment, the battery pack 2 further includes a box body 21 and a cover body 22. The box body 21 has a receiving cavity for receiving the battery module 1. The battery module 1 is loaded into the receiving cavity of the box body 21, and finally the box body 21 and the cover body 22 are connected and fixed.

[0077] In one embodiment, see Fig.11 and Fig.12 As shown, an embodiment of the present invention further provides a battery pack 3, which includes a battery cell 31, a cover 22 and a monitoring assembly 12. The cover 22 is arranged above the battery cell 31. The monitoring assembly 12 is arranged on the cover 22. The monitoring assembly 12 includes a substrate 121 and a monitoring wire 122. The monitoring wire 122 is connected to the substrate 121. When the battery cell 31 explodes, the monitoring wire 122 can be disconnected to monitor the status of the battery cell 31.

[0078] In one embodiment, the battery unit 31 may be a single secondary battery 11 , the battery module 1 of the above-mentioned embodiments, or a battery module in the prior art.

[0079] In one embodiment, the substrate 121 of the monitoring component 12 is bonded to the cover 22. Optionally, the substrate 121 and the cover 22 are bonded by a high temperature resistant adhesive such as silicone adhesive, high temperature epoxy adhesive, organic silicon, phenolic adhesive, etc.

[0080] In one embodiment, the battery pack 3 further includes a box body 21. The box body 21 has a receiving cavity for receiving the battery unit 31. The battery unit 31 is loaded into the receiving cavity of the box body 21, and finally the box body 21 and the cover body 22 are connected and fixed.

[0081] The battery pack 3 of the embodiment of the present invention can realize real-time monitoring of the status of the battery cell 31 by setting up a monitoring component 12. The monitoring component 12 includes a substrate 121 and a monitoring wire 122. Under normal conditions, the monitoring wire 122 itself constitutes a complete circuit. When the battery cell 31 explodes and sprays high-temperature substances, the monitoring wire 122 included in the monitoring component 12 is melted or broken and disconnected. At this time, the monitoring wire 122 can no longer transmit electrical signals, thereby timely feedback of the signal of the explosion of the battery cell 31, so as to take safety intervention measures for the battery pack 3 in time to timely curb the spread of the high-temperature substances exploded in the battery cell 31, and improve the safety of the battery pack 3 during use.

[0082] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery module, characterized in that: include: A secondary battery, a plurality of which are arranged side by side, and each secondary battery has an explosion-proof valve; A monitoring assembly, the monitoring assembly is arranged above the secondary battery, the monitoring assembly comprises a substrate and a monitoring wire, the monitoring wire is connected to the substrate; the monitoring wire has a first section and a second section arranged at intervals along the width direction of the substrate, the first section and the second section are connected in series and are arranged corresponding to the positions of each explosion-proof valve; When any one of the explosion-proof valves explodes, high-temperature material can be ejected from the explosion-proof valve and act on the first section and / or the second section to disconnect the first section and / or the second section. The first section and the second section are redundant with each other. When the first section is not disconnected, the second section is disconnected to monitor the status of the battery module, or, when the second section is not disconnected, the first section is disconnected to monitor the status of the battery module.

2. The battery module according to claim 1, characterized in that: The minimum distance between the first section and the second section is H, and the outer diameter of the monitoring wire is D, wherein H / D≥2.

5.

3. The battery module according to claim 2, characterized in that: The monitoring wire is in a U-shaped structure.

4. The battery module according to claim 2, characterized in that: The explosion-proof valve has a center line extending along the length direction of the substrate, and the first section and the second section are respectively arranged on both sides of the center line.

5. The battery module according to claim 2, characterized in that: The outer diameter D of the monitoring wire is 0.1 mm ≤ D ≤ 2 mm, and the minimum spacing H between the first section and the second section is 5 mm ≤ H ≤ 50 mm.

6. The battery module according to claim 1, characterized in that: The substrate is provided with a receiving portion, the monitoring wire is arranged in the receiving portion, and the shape of the monitoring wire matches the shape of the receiving portion.

7. The battery module according to claim 6, characterized in that: The accommodation portion is a groove sunken along the thickness direction of the substrate, and the bottom wall of the groove does not penetrate the substrate.

8. The battery module according to claim 6, characterized in that: The accommodation portion penetrates the substrate along a thickness direction of the substrate, a maximum dimension of the monitoring wire along the thickness direction is smaller than a thickness of the substrate, and the monitoring wire is disposed in the accommodation portion.

9. The battery module according to claim 6, characterized in that: The monitoring assembly further includes an insulating layer wrapping the monitoring wire, the insulating layer is filled in the accommodating portion, and the monitoring wire is connected to the substrate through the insulating layer.

10. The battery module according to claim 9, characterized in that: The thickness of the insulating layer is M, and the maximum outer diameter of the monitoring wire is D, wherein 0.05≤M / D≤10.

11. The battery module according to claim 10, characterized in that: The thickness of the portion of the insulating layer disposed below the monitoring wire along the thickness direction is M.

12. The battery module according to claim 10 or 11, characterized in that: The thickness of the insulating layer is M, wherein 0.1 mm≤M≤1 mm.

13. The battery module according to claim 1, characterized in that: The monitoring component further comprises a protection plate, which is arranged on a side of the substrate close to the secondary battery along the thickness direction of the substrate.

14. The battery module according to claim 1, characterized in that: The monitoring assembly further includes an isolation plate, which is disposed on a side of the substrate away from the secondary battery along a thickness direction of the substrate.

15. A battery pack, characterized in that: Comprising a battery module as claimed in any one of claims 1 to 14.

16. The battery pack according to claim 15, characterized in that: The number of the battery modules is more than two, and the monitoring wires included in each of the more than two battery modules are connected in series.

17. A battery pack, characterized in that: include: Battery cells; A cover body, disposed above the battery unit; A monitoring assembly, the monitoring assembly is arranged on the cover body, the monitoring assembly comprises a substrate and a monitoring wire, the monitoring wire is connected to the substrate; the monitoring wire has a first section and a second section arranged at intervals along the width direction of the substrate, the first section and the second section are connected in series and are both arranged corresponding to the position of the battery unit; When the battery cell explodes, high-temperature material may be ejected from the battery cell and act on the first section and / or the second section to disconnect the first section and / or the second section. The first section and the second section are redundant with each other. When the first section is not disconnected, the second section is disconnected to monitor the status of the battery cell, or, when the second section is not disconnected, the first section is disconnected to monitor the status of the battery cell.

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