Battery pack and electric equipment

Abstract

The invention relates to the technical field of battery structures, and discloses a battery pack and electric equipment, the battery pack comprises at least one blocking sheet and a plurality of battery packs, the plurality of battery packs are arranged along a first direction, each battery pack comprises a plurality of battery cells arranged along a second direction, and the first direction is perpendicular to the second direction; the parts, positioned on the outer sides of the two pole columns, of the top surfaces of the battery monomers are battery shoulder parts, and a plurality of battery shoulder parts, positioned on one side, of the plurality of battery monomers in the battery pack form a pack shoulder part; wherein in any two adjacent battery packs, two adjacent battery pack shoulder parts of the two battery packs are connected through at least one blocking piece; the thermal shock to adjacent battery packs can be reduced, and the safety and reliability of the battery pack are improved.

Description

Technical Field

[0001] This application relates to the technical field of battery structures, and particularly to battery packs and electrical equipment. Background Art

[0002] A battery pack is an integrated unit that combines multiple battery cells in series and parallel, and is equipped with components such as a battery management system and a heat dissipation device. It can improve the battery capacity and output voltage, and achieve charge and discharge control, temperature monitoring, and safety protection. It is widely used in new energy vehicles, energy storage power stations, portable devices and other fields, and is a key component for electrical energy storage and supply.

[0003] In related technologies, multiple battery modules are usually arranged in a battery pack. Multiple battery groups are arranged in each battery module, and multiple battery cells are arranged in the battery group. However, once the battery case of a thermally out-of-control battery is damaged (such as the welding joint between the cover plate and the case is damaged), and side spraying or the core rolls up occurs, it will directly impact the adjacent battery and busbar from the side, causing greater safety hazards. Summary of the Invention

[0004] This application provides a battery pack and electrical equipment, which can reduce the thermal impact on adjacent battery groups and improve the safety and reliability of the battery pack.

[0005] On the one hand, this application provides a battery pack, including at least one blocking sheet and multiple battery groups. The specific solutions are as follows.

[0006] The multiple battery groups are arranged along a first direction. The battery group includes multiple battery cells arranged along a second direction, and the first direction is perpendicular to the second direction. The part of the top surface of the battery cell located outside the two pole columns is the battery shoulder. The multiple battery shoulders of the multiple battery cells in one side of the battery group form a group shoulder. Among them, in any two adjacent battery groups, the two group shoulders of the two battery groups close to each other are connected by at least one blocking sheet.

[0007] Beneficial effects: By connecting the two group shoulders of two adjacent battery groups close to each other with at least one blocking sheet, and the blocking sheet is close to the part of the thermal impact, it can be folded away from the battery cell under the action of thermal impact, so as to block the gas-liquid mixture formed by side spraying, reduce or avoid the gas-liquid mixture from flowing to the adjacent battery group, and avoid problems such as short circuit or corrosion damage of the adjacent battery group, thereby improving the safety and reliability of the battery pack.

[0008] In an optional embodiment, it further includes at least one bus bar, the bus bar is connected to the pole posts of a plurality of the battery cells, the bus bar and the barrier sheet are arranged at intervals in a third direction, and along the third direction, the part of the barrier sheet in contact with any one of the group shoulders at least partially overlaps with the bus bar in the positive projection along the third direction, wherein the third direction is perpendicular to both the first direction and the second direction.

[0009] In an optional embodiment, the dimension of the part of the barrier sheet in contact with any one of the group shoulders along the first direction is greater than the distance between the barrier sheet and the bus bar along the third direction.

[0010] In an optional embodiment, at least one first seal is arranged on the surface of the bus bar facing the barrier sheet, and in the folded state, the barrier sheet can be in contact with the first seal; and / or, at least one second seal is arranged on the surface of the edge of the barrier sheet facing the bus bar.

[0011] In an optional embodiment, a first weakening part is arranged in the middle of the barrier sheet along the first direction, and the first weakening part extends along the second direction.

[0012] In an optional embodiment, second weakening parts are arranged on both sides of the first weakening part on the barrier sheet, and the second weakening parts are arranged at intervals from the first weakening part along the first direction.

[0013] In an optional embodiment, in any two adjacent battery packs, the two group shoulders of the two battery packs close to each other are connected by one barrier sheet.

[0014] In an optional embodiment, two bonding parts are arranged on the barrier sheet and are bonded to the two group shoulders respectively;

[0015] The bonding part includes at least one first bonding strip and a plurality of second bonding strips. The distance between the first bonding strip and the middle of the barrier sheet is less than the distance between the plurality of second bonding strips and the middle of the barrier sheet. The first bonding strip extends along the second direction and is bonded to the battery shoulders of a plurality of battery cells in the battery pack. The plurality of second bonding strips are arranged at intervals along the second direction and are respectively bonded to the battery shoulders of a plurality of battery cells in one-to-one correspondence. The dimension of the second bonding strip in the second direction gradually decreases along the first direction and away from the middle of the barrier sheet.

[0016] In an optional embodiment, the barrier sheet is a high-temperature resistant insulating sheet.

[0017] On the other hand, the present application also provides an electrical device, including: the battery pack in any of the above embodiments.

[0018] Beneficial effects: Since the electrical device includes the battery pack and has the same effects as the battery pack, they will not be elaborated here. Description of the Drawings

[0019] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the related art, the following will briefly introduce the drawings required to be used in the description of the specific embodiments or the related art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 Schematic structural diagram of a battery pack according to an embodiment of the present application;

[0021] Figure 2 Front view of a battery pack according to an embodiment of the present application;

[0022] Figure 3 Front view of another state of a battery pack according to an embodiment of the present application;

[0023] Figure 4 Front view of another battery pack according to an embodiment of the present application;

[0024] Figure 5 Front view of yet another battery pack according to an embodiment of the present application;

[0025] Figure 6 Schematic structural diagram of the cooperation between the barrier sheet and the battery pack in yet another battery pack according to an embodiment of the present application;

[0026] Figure 7 Schematic structural diagram of the barrier sheet in a battery pack according to an embodiment of the present application;

[0027] Figure 8 Schematic structural diagram of the cooperation between the barrier sheet and the battery pack in a battery pack according to an embodiment of the present application.

[0028] Description of the reference numerals:

[0029] X, the first direction; Y, the second direction; Z, the third direction;

[0030] 1, barrier sheet; 2, battery pack; 3, bus bar; 4, high-temperature protection plate;

[0031] 11, first weakening part; 12, second weakening part; 13, bonding part; 131, first bonding tape; 132, second bonding tape;

[0032] 21. Battery cell; 211. Terminal; 212. Battery shoulder; 22. Group shoulder;

[0033] 31. First seal. Detailed implementation manner

[0034] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some but not all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0035] It should be noted that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application. The terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements. The terms "parallel", "perpendicular" and "equal" include the described situations and situations similar to the described situations, and the range of the similar situations is within the acceptable deviation range, where the acceptable deviation range is determined by those of ordinary skill in the art considering the measurement being discussed and the errors related to the measurement of a specific quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallel and approximate parallel, where the acceptable deviation range of approximate parallel may be within 5° deviation; "perpendicular" includes absolute perpendicular and approximate perpendicular, where the acceptable deviation range of approximate perpendicular may also be within 5° deviation. "Equal" includes absolute equality and approximate equality, where the acceptable deviation range of approximate equality may be that the difference between the two equal ones is less than or equal to 5% of any one of them. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0036] In the related art, a battery pack is an integrated unit that combines multiple battery cells in series and parallel, and is equipped with components such as a battery management system and a heat dissipation device. It can increase the battery capacity and output voltage, achieve charge and discharge control, temperature monitoring, and safety protection. It is widely used in new energy vehicles, energy storage power stations, portable devices and other fields, and is a key component for electric energy storage and supply.

[0037] Multiple battery modules are usually arranged in the battery pack. Multiple battery groups are arranged in each battery module, and multiple battery cells are arranged in the battery group. However, once the battery case with thermal runaway is damaged (such as the welding joint between the cover plate and the case is damaged), and side spraying or the core rolls up occurs, it will directly impact the adjacent battery and busbar from the side, causing greater safety hazards.

[0038] To solve the above technical problems, the present application provides a battery pack and an electrical device, which can reduce the thermal impact on adjacent battery groups and improve the safety and reliability of the battery pack.

[0039] The following combines Figures 1 to 8 to describe the embodiments of the present application.

[0040] According to an embodiment of the present application, on the one hand, a battery pack is provided. As Figures 1 to 3 shown, it includes at least one blocking piece 1 and multiple battery groups 2. The specific scheme is as follows.

[0041] As Figure 1 shown, multiple battery groups 2 are arranged along the first direction X. The battery group 2 includes multiple battery cells 21 arranged along the second direction Y. The first direction X is perpendicular to the second direction Y. As Figure 1 shown, the part of the top surface of the battery cell 21 located outside the two pole posts 211 is the battery shoulder 212, that is, two pole posts 211 are arranged at intervals on the top surface of the battery for charge and discharge. As Figure 1 shown, the multiple battery shoulders 212 of multiple battery cells 21 on one side in the battery group 2 form a group shoulder 22, that is, the group shoulder 22 includes the battery shoulders 212 of multiple battery cells 21 on the same side.

[0042] Among them, as Figure 1 and Figure 2 shown, in any two adjacent battery groups 2, the two group shoulders 22 of the two battery groups 2 close to each other are connected by at least one blocking piece 1 in a bonding manner or a welding manner, that is, the blocking piece 1 is connected to multiple battery shoulders 212.

[0043] Specifically, an adhesive layer can be provided on the barrier sheet 1 by means of rolling glue to connect with the group shoulder 22; or an adhesive layer can be formed by directly pasting double-sided tape or pressure-sensitive adhesive to connect with the component part; if the barrier sheet 1 is a material that can be ultrasonically welded, such as a deformable plastic plate, etc., it can be connected to the battery shoulder 212 by welding.

[0044] The barrier sheet 1 is a high-temperature resistant insulating sheet, such as mica sheet, silicone rubber, etc.

[0045] The part of the barrier sheet 1 close to the thermal shock can be folded away from the battery cell 21 under the action of the thermal shock.

[0046] It should be noted that the first direction X, the second direction Y, and the third direction Z do not refer to any direction of the battery pack in the design model, but only refer to two directions of the multiple battery groups 2, and these two directions have nothing to do with any setting.

[0047] In the specific use process, as Figure 1 shown, multiple battery modules are provided in the battery pack, and two battery groups 2 are provided in each battery module. When the battery cells 21 in the battery group 2 are under external pressure or the internal reaction temperature of the battery cells 21 is too high and cause side spraying, the ejected gas-liquid mixture forms a thermal shock and will flow to the adjacent battery group 2, thus causing problems such as short circuit to the battery cells 21 in the adjacent battery group 2.

[0048] As Figure 2 shown, and the setting of the barrier sheet 1 can, when the battery cells 21 in the battery group 2 are under external pressure or the internal reaction temperature of the battery cells 21 is too high and cause side spraying, as Figure 3 shown, the ejected gas-liquid mixture forms a thermal shock and impacts the part of the barrier sheet 1 close to the side spraying, causing it to fold, forming a barrier, so as to be able to reduce or avoid the gas-liquid mixture formed by side spraying from flowing to the adjacent battery group 2.

[0049] In this embodiment, as Figures 1 to 3 shown, in the two adjacent battery groups 2, the two group shoulders 22 where the two battery groups 2 are close to each other are connected by at least one barrier sheet 1, and the part of the barrier sheet 1 close to the thermal shock can be folded away from the battery cell 21 under the action of the thermal shock, so as to be able to block the gas-liquid mixture formed by side spraying, reduce or avoid the gas-liquid mixture from flowing to the adjacent battery group 2, and avoid problems such as short circuit or corrosion damage in the adjacent battery group 2, thereby improving the safety and reliability of the battery pack.

[0050] In one embodiment, as Figure 1As shown, the battery pack further includes at least one bus bar 3. Specifically, the bus bar 3 is a conductive plate, such as a copper plate, an aluminum plate, or a copper-aluminum composite plate, etc.; as Figure 3 As shown, the bus bar 3 is connected to the poles 211 of multiple battery cells 21 by welding. The bus bar 3 and the barrier sheet 1 are spaced apart along the third direction Z, and at least a part of the projection of the part where the barrier sheet 1 contacts any one of the group shoulders 22 along the third direction Z overlaps with the bus bar 3; wherein, the third direction Z is perpendicular to both the first direction X and the second direction Y; at least one high-temperature resistant protection plate 4 is provided above the bus bar 3 to contact the top plate of the battery pack housing.

[0051] During the specific use process, as Figure 3 As shown, when the battery cells 21 in the battery pack 2 are under external pressure or the internal reaction temperature of the battery cells 21 is too high, etc., causing side spraying, and when the amount of the ejected gas-liquid mixture is huge, the barrier sheet 1 is folded under the thermal shock of the gas-liquid mixture to form a barrier dam. The barrier sheet 1 and the bus bar 3 can be spaced apart or in contact. Thus, through their synergistic effect, the gas-liquid mixture flowing towards the adjacent battery pack 2 can be reduced.

[0052] In this embodiment, as Figure 2 and Figure 3 As shown, the bus bar 3 and the barrier sheet 1 are spaced apart along the third direction Z, and at least a part of the projection of the part where the barrier sheet 1 contacts any one of the group shoulders 22 along the third direction Z overlaps with the bus bar 3. After a part of the barrier sheet 1 is folded under the thermal shock, it cooperates with the bus bar 3 to block the gas-liquid mixture formed by side spraying, thereby further reducing the flow of the gas-liquid mixture towards the adjacent battery pack 2, further improving the safety and reliability of the battery pack, and reducing the maintenance cost of the battery pack.

[0053] In one embodiment, as Figure 2 As shown, the dimension of the part where the barrier sheet 1 contacts any one of the group shoulders 22 along the first direction X is greater than the distance between the barrier sheet 1 and the bus bar 3 along the third direction Z.

[0054] During the specific use process, as Figure 2 and Figure 3 As shown, when the battery cells 21 in the battery pack 2 are under external pressure or the internal reaction temperature of the battery cells 21 is too high, etc., causing side spraying, and when the amount of the ejected gas-liquid mixture is huge, the barrier sheet 1 is folded under the thermal shock of the gas-liquid mixture. Since the dimension of the part where the barrier sheet 1 contacts any one of the group shoulders 22 along the first direction X is greater than the distance between the barrier sheet 1 and the bus bar 3 along the third direction Z, the folded edge of the barrier sheet 1 can be in contact with the bus bar 3. Thus, through their synergistic effect, the gas-liquid mixture flowing towards the adjacent battery pack 2 can be greatly reduced.

[0055] In this embodiment, as Figure 2 and Figure 3 shown, the dimension of the contact part between the barrier sheet 1 and any one of the group shoulders 22 along the first direction X is greater than the distance between the barrier sheet 1 and the bus bar 3 along the third direction Z. After a part of the barrier sheet 1 is turned over due to thermal shock, it cooperates with the bus bar 3 to form a closed barrier space to block the gas-liquid mixture formed by side spraying, so as to completely block the flow of the gas-liquid mixture to the adjacent battery pack 2, further improving the safety and reliability of the battery pack and reducing the maintenance cost of the battery pack.

[0056] In one embodiment, as Figure 5 shown, at least one first seal 31 is provided on the surface of the bus bar 3 facing the barrier sheet 1. When the barrier sheet 1 is in the turned-over state, it can contact the first seal 31; specifically, the first seal 31 is a seal that is resistant to high temperature and corrosion, and the specific material is such as silicone rubber, etc.; by providing the first seal 31, the sealing performance between the barrier sheet 1 and the bus bar 3 in the turned-over state is improved, and the possibility of preventing the gas-liquid mixture formed by side spraying from passing through is further improved.

[0057] Specifically, when there are multiple first seals 31, they can be arranged at intervals along the first direction X.

[0058] And / or, at least one second seal (not shown in the figure) is provided on the surface of the edge of the barrier sheet 1 facing the bus bar 3; specifically, the second seal is a seal that is resistant to high temperature and corrosion, and the specific material is such as silicone rubber, etc.; by providing the second seal, the sealing performance between the barrier sheet 1 and the bus bar 3 in the turned-over state is improved, and the possibility of preventing the gas-liquid mixture formed by side spraying from passing through is further improved.

[0059] Specifically, when there are multiple second seals, they can be arranged at intervals along the first direction X.

[0060] During the specific use process, when the battery cell 21 undergoes side spraying, the barrier sheet 1 is turned over due to thermal shock. Thus, the first seal 31 and the second seal cooperate to enable the turned-over barrier sheet 1 to be in sealed contact with the bus bar 3, so as to completely block the flow of the gas-liquid mixture to the adjacent battery pack 2.

[0061] In this embodiment, as Figure 5As shown, at least one first seal 31 is provided on the surface of the bus bar 3 facing the barrier sheet 1. When the barrier sheet 1 is in the folded state, it can contact the first seal 31, and at least one second seal is provided on the surface of the edge of the barrier sheet 1 facing the bus bar 3. When the first seal 31 and the second seal cooperate, the folded barrier sheet 1 can be in sealed contact with the bus bar 3 to completely block the flow of the gas-liquid mixture to the adjacent battery pack 2, thereby further improving the safety and reliability of the battery pack and reducing the maintenance cost of the battery pack.

[0062] In one embodiment, as Figure 4 and Figure 6 shown, a first weakening portion 11 is provided in the middle of the barrier sheet 1 along the first direction X, and the first weakening portion 11 extends along the second direction Y. Specifically, the first weakening portion 11 is a weakening groove or a scoring portion.

[0063] In the specific use process, when the battery cell 21 in the battery pack 2 is under external pressure or the internal reaction temperature of the battery cell 21 is too high and causes side spray, a thermal shock is applied to the barrier sheet 1. The setting of the first weakening portion 11 enables the barrier sheet 1 to be folded in a preset state.

[0064] In this embodiment, as Figure 4 shown, by providing the first weakening portion 11 in the middle of the barrier sheet 1 along the first direction X and the first weakening portion 11 extending along the second direction Y, the folding state of the barrier sheet 1 can be preset, avoiding an unsatisfactory folding state of the barrier sheet 1, thereby affecting the blocking effect on the gas-liquid mixture.

[0065] In one embodiment, as Figure 6 shown, second weakening portions 12 are provided on both sides of the barrier sheet 1 located at the first weakening portion 11, and the second weakening portions 12 are spaced from the first weakening portion 11 along the first direction X. Specifically, the second weakening portion 12 is a weakening groove or a scoring portion.

[0066] In the specific use process, as Figure 6 shown, when the battery cell 21 in the battery pack 2 is under external pressure or the internal reaction temperature of the battery cell 21 is too high and causes side spray, a thermal shock is applied to the barrier sheet 1. The setting of the first weakening portion 11 enables the barrier sheet 1 to be folded around the first weakening portion 11. After the edge of the barrier sheet 1 contacts the bus bar 3, the second weakening portion 12 enables the barrier sheet 1 to be folded back, so that the edge of the barrier sheet 1 can fit more closely with the bus bar 3.

[0067] In this embodiment, as Figure 6As shown, on the barrier sheet 1, second weakening portions 12 are provided on both sides of the first weakening portion 11. The second weakening portions 12 and the first weakening portion 11 are spaced along the first direction X, enabling the barrier sheet 1 to be reversely folded after contacting the bus bar 3, improving the fitting effect between the barrier sheet 1 and the bus bar 3, and thus enhancing the blocking effect on the gas-liquid mixture.

[0068] In one embodiment, as Figure 1 shown, in any two adjacent battery packs 2, the two group shoulders 22 of the two battery packs 2 that are close to each other are connected by a barrier sheet 1; that is, two adjacent battery packs 2 are connected by a barrier sheet 1 at the two group shoulders 22 that are close to each other.

[0069] In this embodiment, by connecting the two group shoulders 22 of any two adjacent battery packs 2 with a barrier sheet 1, the integrity of the blocking effect between the two adjacent battery packs 2 can be improved, avoiding the situation where local blocking cannot be performed.

[0070] In some embodiments not shown, in any two adjacent battery packs 2, the two group shoulders 22 of the two battery packs 2 that are close to each other are connected by a plurality of barrier sheets 1 arranged side by side along the second direction Y; that is, a part of the two group shoulders 22 of two adjacent battery packs 2 that are close to each other is connected by a barrier sheet 1, and the other part is connected by another barrier sheet 1.

[0071] In this embodiment, by connecting the two group shoulders 22 of any two adjacent battery packs 2 with a plurality of barrier sheets 1 arranged side by side along the second direction Y, it is convenient for maintenance and disassembly; however, after folding at the joint of two adjacent barrier sheets 1, there will be a gap, and the problem of being unable to block the gas-liquid mixture will occur.

[0072] In one embodiment, as Figure 7 shown, two bonding portions 13 are provided on the barrier sheet 1, which are respectively bonded to the two group shoulders 22; the shapes of the two bonding portions 13 are symmetrical figures.

[0073] As Figure 7 shown, the bonding portion 13 includes at least one first bonding strip 131 and a plurality of second bonding strips 132. The distance between the first bonding strip 131 and the middle of the barrier sheet 1 is less than the distance between the plurality of second bonding strips 132 and the middle of the barrier sheet 1, that is, the plurality of second bonding strips 132 are closer to the edge of the barrier sheet 1 than the first bonding strip 131; as Figure 8As shown, the first adhesive tape 131 extends along the second direction Y and is bonded to the battery shoulders 212 of multiple battery cells 21 in the battery pack 2. Multiple second adhesive tapes 132 are arranged at intervals along the second direction Y and are respectively bonded to the battery shoulders 212 of the multiple battery cells 21 in a one-to-one correspondence. The size of the second adhesive tape 132 in the second direction Y gradually decreases along the first direction X and away from the middle of the blocking piece 1.

[0074] Specifically, the first adhesive tape 131 is strip-shaped, and the second adhesive tape 132 is trapezoidal or triangular, etc.

[0075] In the specific use process, as Figure 7 and Figure 8 shown, when the battery cells 21 in the battery pack 2 are under external pressure or the internal reaction temperature of the battery cells 21 is too high and causes side spraying, since the bonding strength between the first adhesive tape 131 in the two bonding parts 13 and the group shoulder 22 is the same, when suffering from a thermal shock, the first adhesive tape 131 near the side spraying part separates from the group shoulder 22.

[0076] In the subsequent thermal shock process, since the distance between the second adhesive tape and the side spraying part increases, the thermal shock force received will be less than that of the unseparated first adhesive tape 131. However, since the size of the second adhesive tape 132 in the second direction Y gradually decreases along the first direction X and away from the middle of the blocking piece 1, as the distance between the second adhesive tape 132 and the side spraying part increases, the bonding strength between the second adhesive tape 132 and the battery shoulder 212 also gradually decreases, ensuring that the unseparated first adhesive tape 131 remains in an unseparated state.

[0077] In this embodiment, as Figure 7 and Figure 8 shown, by using the first adhesive tape 131 extending along the second direction Y and being bonded to the battery shoulders 212 of multiple battery cells 21 in the battery pack 2, and multiple second adhesive tapes 132 being arranged at intervals along the second direction Y and being respectively bonded to the battery shoulders 212 of the multiple battery cells 21 in a one-to-one correspondence, and the size of the second adhesive tape 132 in the second direction Y gradually decreasing along the first direction X and away from the middle of the blocking piece 1, the risk of cracking of the bonding parts 13 on the adjacent sides can be reduced.

[0078] In one embodiment, a battery pack is provided. As Figures 1 to 3 shown, it includes at least one blocking piece 1 and multiple battery packs 2. The specific scheme is as follows.

[0079] As Figure 1 shown, multiple battery packs 2 are arranged along the first direction X. The battery pack 2 includes multiple battery cells 21 arranged along the second direction Y. The first direction X is perpendicular to the second direction Y. As Figure 1As shown, the part of the top surface of the battery cell 21 located outside the two pole posts 211 is the battery shoulder 212, that is, two pole posts 211 are arranged at intervals on the top surface of the battery for charging and discharging; as Figure 1 shown, the multiple battery shoulders 212 of multiple battery cells 21 on one side in the battery pack 2 form a group shoulder 22, that is, the group shoulder 22 includes the battery shoulders 212 of multiple battery cells 21 on the same side.

[0080] Among them, as Figure 1 and Figure 2 shown, in any two adjacent battery packs 2, the two group shoulders 22 of the two battery packs 2 close to each other are connected by at least one barrier sheet 1 in a bonding manner or a welding manner, that is, the barrier sheet 1 is connected to the multiple battery shoulders 212.

[0081] Specifically, an adhesive layer can be provided on the barrier sheet 1 by means of rolling glue to connect with the group shoulder 22; or an adhesive layer can be formed by directly pasting double-sided tape or pressure-sensitive adhesive to connect with the component part; if the barrier sheet 1 is a material that can be ultrasonically welded, such as a deformable plastic plate, etc., it can be connected to the battery shoulder 212 by welding.

[0082] The barrier sheet 1 is a high-temperature resistant insulating sheet, such as mica sheet, silicone rubber, etc.

[0083] The part of the barrier sheet 1 close to the thermal shock can be folded away from the battery cell 21 under the action of thermal shock.

[0084] It should be noted that the first direction X, the second direction Y and the third direction Z do not refer to any direction of the battery pack in the design model, but only refer to two directions of the multiple battery packs 2, and these two directions have nothing to do with any setting.

[0085] Further specifically, as Figure 1 shown, the battery pack further includes at least one bus bar 3. Specifically, the bus bar 3 is a conductive plate, such as a copper plate, an aluminum plate and a copper-aluminum composite material plate, etc.; as Figure 3 shown, the bus bar 3 is connected to the pole posts 211 of the multiple battery cells 21 by welding. The bus bar 3 and the barrier sheet 1 are arranged at intervals along the third direction Z, and at least part of the positive projection of the part where the barrier sheet 1 contacts any one group shoulder 22 overlaps with the bus bar 3 along the third direction Z; among them, the third direction Z is perpendicular to both the first direction X and the second direction Y; at least one high-temperature resistant protection plate 4 is arranged above the bus bar 3 to contact the top plate of the battery pack box.

[0086] Further specifically, as Figure 2As shown, the dimension of the portion of the blocking piece 1 in contact with any one of the group shoulders 22 along the first direction X is greater than the distance between the blocking piece 1 and the bus bar 3 along the third direction Z.

[0087] More specifically, as Figure 5 shown, at least one first seal 31 is provided on the surface of the bus bar 3 facing the blocking piece 1. When the blocking piece 1 is in the folded state, it can be in contact with the first seal 31. Specifically, the first seal 31 is a seal that is heat-resistant and corrosion-resistant, and the specific material is such as silicone rubber, etc. By providing the first seal 31, the sealing performance between the blocking piece 1 and the bus bar 3 in the folded state is improved, and further the possibility of preventing the gas-liquid mixture formed by side spraying from passing through is increased.

[0088] Specifically, when there are multiple first seals 31, they can be arranged at intervals along the first direction X.

[0089] At least one second seal (not shown in the figure) is provided on the surface of the edge of the blocking piece 1 facing the bus bar 3. Specifically, the second seal is a seal that is heat-resistant and corrosion-resistant, and the specific material is such as silicone rubber, etc. By providing the second seal, the sealing performance between the blocking piece 1 and the bus bar 3 in the folded state is improved, and further the possibility of preventing the gas-liquid mixture formed by side spraying from passing through is increased.

[0090] Specifically, when there are multiple second seals, they can be arranged at intervals along the first direction X.

[0091] More specifically, as Figure 4 and Figure 6 shown, a first weakening portion 11 is provided in the middle of the blocking piece 1 along the first direction X, and the first weakening portion 11 extends along the second direction Y. Specifically, the first weakening portion 11 is a weakening groove or a scoring portion.

[0092] More specifically, as Figure 6 shown, second weakening portions 12 are provided on both sides of the blocking piece 1 where the first weakening portion 11 is located, and the second weakening portions 12 are spaced apart from the first weakening portion 11 along the first direction X. Specifically, the second weakening portions 12 are weakening grooves or scoring portions.

[0093] More specifically, as Figure 6 shown, by providing second weakening portions 12 on both sides of the blocking piece 1 where the first weakening portion 11 is located, and the second weakening portions 12 are spaced apart from the first weakening portion 11 along the first direction X, the blocking piece 1 can be reversely folded after contacting the bus bar 3, improving the fitting effect between the blocking piece 1 and the bus bar 3, thereby improving the blocking effect on the gas-liquid mixture.

[0094] More specifically, as Figure 1As shown, in any two adjacent battery packs 2, two group shoulders 22 of the two battery packs 2 that are close to each other are connected by a blocking piece 1; that is, two group shoulders 22 of two adjacent battery packs 2 that are close to each other are connected by a blocking piece 1.

[0095] More specifically, as Figure 7 shown, two bonding portions 13 are provided on the blocking piece 1 and are respectively bonded to the two group shoulders 22; the shapes of the two bonding portions 13 are symmetric figures.

[0096] As Figure 7 shown, the bonding portion 13 includes at least one first bonding strip 131 and a plurality of second bonding strips 132. The distance between the first bonding strip 131 and the middle of the blocking piece 1 is less than the distance between the plurality of second bonding strips 132 and the middle of the blocking piece 1, that is, the plurality of second bonding strips 132 are closer to the edge of the blocking piece 1 than the first bonding strip 131; as Figure 8 shown, the first bonding strip 131 extends along the second direction Y and is bonded to the battery shoulders 212 of a plurality of battery cells 21 in the battery pack 2. The plurality of second bonding strips 132 are arranged at intervals along the second direction Y and are respectively bonded to the battery shoulders 212 of the plurality of battery cells 21 in a one-to-one correspondence. The dimension of the second bonding strip 132 in the second direction Y gradually decreases along the first direction X and away from the middle of the blocking piece 1.

[0097] According to an embodiment of the present application, on the other hand, an electrical device is provided, including the battery pack in any one of the above embodiments.

[0098] Specifically, the electrical device is a new energy vehicle, a new energy aircraft, etc.

[0099] In this embodiment, since the electrical device includes the battery pack and has the same technical effects as the battery pack, it will not be elaborated here.

[0100] Although the embodiments of the present application are described with reference to the accompanying 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 appended claims.

Claims

1. A battery pack, characterized in that, Comprising: At least one barrier sheet (1); A plurality of battery packs (2) arranged along a first direction (X), the battery packs (2) comprising a plurality of battery cells (21) arranged along a second direction (Y), the first direction (X) being perpendicular to the second direction (Y); the part of the top surface of the battery cell (21) located outside the two pole columns (211) is the battery shoulder (212), and the plurality of battery shoulders (212) of the plurality of battery cells (21) on one side in the battery pack (2) form a group shoulder (22); Wherein, in any two adjacent battery packs (2), the two group shoulders (22) of the two battery packs (2) close to each other are connected by at least one barrier sheet (1).

2. The battery pack according to claim 1, wherein, It further comprises at least one bus bar (3), the bus bar (3) being connected to the pole columns (211) of the plurality of battery cells (21), the bus bar (3) and the barrier sheet (1) being spaced apart along a third direction (Z), and the part of the barrier sheet (1) in contact with any one group shoulder (22) overlapping at least partially with the bus bar (3) in the positive projection along the third direction (Z), wherein the third direction (Z) is perpendicular to both the first direction (X) and the second direction (Y).

3. The battery pack according to claim 2, characterized in that, The dimension of the part of the barrier sheet (1) in contact with any one group shoulder (22) along the first direction (X) is greater than the distance between the barrier sheet (1) and the bus bar (3) along the third direction (Z).

4. The battery pack according to claim 2 or 3, characterized in that, At least one first seal (31) is provided on the surface of the bus bar (3) facing the barrier sheet (1), and in the folded state, the barrier sheet (1) can be in contact with the first seal (31); And / or, at least one second seal is provided on the surface of the edge of the barrier sheet (1) facing the bus bar (3).

5. The battery pack according to any one of claims 1 to 3, characterized in that, A first weakening portion (11) is provided in the middle of the barrier sheet (1) along the first direction (X), and the first weakening portion (11) extends along the second direction (Y).

6. The battery pack according to claim 5, wherein, Second weakening portions (12) are provided on both sides of the barrier sheet (1) where the first weakening portion (11) is located, and the second weakening portions (12) are spaced apart from the first weakening portion (11) along the first direction (X).

7. The battery pack according to any one of claims 1 to 3, characterized in that In any two adjacent battery packs (2), the two group shoulders (22) of the two battery packs (2) close to each other are connected by one barrier sheet (1).

8. The battery pack according to any one of claims 1 to 3, characterized in that, Two bonding portions (13) are provided on the barrier sheet (1) and are bonded to the two group shoulders (22) respectively; The bonding part (13) includes at least one first bonding tape (131) and a plurality of second bonding tapes (132). The distance between the first bonding tape (131) and the middle of the barrier sheet (1) is less than the distance between the plurality of second bonding tapes (132) and the middle of the barrier sheet (1). The first bonding tape (131) extends along the second direction (Y) and is bonded to the battery shoulders (212) of the plurality of battery cells (21) in the battery pack (2). The plurality of second bonding tapes (132) are arranged at intervals along the second direction (Y) and are respectively bonded to the battery shoulders (212) of the plurality of battery cells (21) in one-to-one correspondence. The dimension of the second bonding tape (132) in the second direction (Y) gradually decreases along the first direction (X) and away from the middle of the barrier sheet (1).

9. The battery pack according to any one of claims 1 to 3, characterized in that, The barrier sheet (1) is a high-temperature resistant insulating sheet.

10. An electrical device, characterized in that, Comprising: The battery pack according to any one of claims 1 to 9.

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