Battery pack and electric device

Abstract

The application discloses a battery pack and an electric device, which comprises a battery compartment and an electrical compartment arranged by a first partition body, the battery compartment is divided into at least two mutually independent sealed sub-battery compartments by a second partition body, the first partition body is provided with a hollow part, the first sub-battery compartment and the second sub-battery compartment are communicated with the electrical compartment through the same hollow part; the first busbar of the first sub-battery compartment is introduced into the electrical compartment through the hollow part, the second busbar of the second sub-battery compartment is introduced into the electrical compartment through the hollow part, and the first busbar and the second busbar are sealingly connected with the first partition body at the hollow part. The sub-battery compartments are mutually independent and sealed, when abnormal conditions such as thermal runaway occur in the battery pack in some of the sub-battery compartments, the diffusion of high-temperature gas to other sub-battery compartments can be effectively prevented, and the safety risk is reduced. Moreover, the busbars are introduced out through the same hollow part, the number of hollow parts provided on the first partition body can be reduced, and the sealing effect between the sub-battery compartments is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery pack and electrical device. Background Technology

[0002] A battery pack typically consists of a battery housing and multiple battery cells housed within it. Each battery cell can contain multiple individual battery cells. These battery cells can be connected in series or parallel. When thermal runaway occurs within the battery pack, adjacent battery cells can interfere with each other. In other words, thermal runaway in one battery cell can affect the operation of another, causing all battery cells to fail to start normally and compromising the safety of the electrical equipment.

[0003] Therefore, how to avoid the impact on other battery packs when some battery packs experience thermal runaway and improve the safety of electrical equipment is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a battery pack that can avoid the impact on other battery packs when some battery packs experience thermal runaway, thereby improving the safety of electrical equipment.

[0005] Another object of this application is to provide an electrical device having the above-mentioned battery pack.

[0006] To achieve the above objectives, this application provides the following technical solution:

[0007] The first aspect of this application provides a battery pack, including a battery housing. The battery housing includes a housing body, which includes a battery compartment and an electrical compartment separated by a first partition. The battery compartment is further divided into at least two independently sealed sub-battery compartments by a second partition. The at least two sub-battery compartments are separated from the electrical compartment by the first partition. The first partition has a cutout at a position corresponding to each of the at least two sub-battery compartments, and the at least two sub-battery compartments are connected to the electrical compartment through the corresponding cutout.

[0008] One of any two adjacent sub-battery compartments is designated as the first sub-battery compartment, and the other as the second sub-battery compartment. The hollow portion corresponding to the first sub-battery compartment is designated as the first hollow portion, and the hollow portion corresponding to the second sub-battery compartment is designated as the second hollow portion. The first busbar of the first sub-battery compartment is sealed into the electrical compartment through the first hollow portion. The first hollow portion and the second hollow portion are respectively sealed to the corresponding first busbar and second busbar through partition seals, and the distance between the two partition seals is in the range of 30mm to 700mm.

[0009] The battery pack provided in this application has its battery compartment divided into at least two independently sealed sub-battery compartments by a second partition. The busbars within each sub-battery compartment are introduced into the electrical compartment through perforations to achieve series and parallel connection of the battery packs within the electrical compartment. Simultaneously, the busbars are sealed to the first partition at the perforations. Each sub-battery compartment is independently sealed, effectively preventing the diffusion of high-temperature gases to other sub-battery compartments in the event of thermal runaway or other abnormal conditions within some sub-battery compartments, thus reducing safety risks. Even when some sub-battery compartments fail, the vehicle can still continue to operate using power from other functioning sub-battery compartments, ensuring the vehicle can be driven to a safe area or that doors can be opened normally, ensuring that critical vehicle functions are not significantly affected. In this application, adjacent sub-battery compartments each have their corresponding perforations leading out the busbars, reducing mutual interference between their respective sealing positions, ensuring the sealing effect between the two sub-battery compartments, and improving the safety performance of the battery pack.

[0010] This application selects the distance between the first hollow portion and the corresponding partition seal 112 of the second hollow portion within the range of 30mm to 700mm. This ensures that the distance between the first and second busbars is not too close, which would cause the vibration to be superimposed and the corresponding hollow portion sealing position to be subjected to excessive impact, resulting in sealing failure. At the same time, it ensures that the distance between the first and second busbars is not too far, which would result in the busbar length being too long and the battery pack current transmission path being too long.

[0011] A second aspect of this application provides an electrical device that includes a battery pack as described in any of the preceding claims.

[0012] The electrical equipment provided in this application has the aforementioned battery pack, and therefore possesses all the technical effects of the aforementioned battery pack, which will not be elaborated upon here. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the internal structure of the battery pack disclosed in an embodiment of this application;

[0015] Figure 2 This is a top view of the internal structure of the battery pack disclosed in the embodiments of this application;

[0016] Figure 3 for Figure 2 Sectional view along AA;

[0017] Figure 4 This is a top-view schematic diagram of the internal structure of the battery pack disclosed in an embodiment of this application.

[0018] Figure 5 This is a top view of the internal structure of the battery pack disclosed in an embodiment of this application from another angle.

[0019] Figure 6 This is a diagram showing the fit between the first partition and the battery box cover as disclosed in an embodiment of this application.

[0020] Figure 7 This is a diagram showing the fit between the first partition and the battery box cover, as disclosed in another embodiment of this application.

[0021] Figure 8 This is a front view of the first partition disclosed in the embodiments of this application;

[0022] Figure 9 This is a schematic diagram of the vertical arrangement of the busbar disclosed in the embodiments of this application;

[0023] Figure 10 This is a schematic diagram of the lateral arrangement of the busbar disclosed in the embodiments of this application;

[0024] Figure 11 This is a schematic diagram of a busbar with a bent portion disclosed in an embodiment of this application.

[0025] The meanings of the various reference numerals in the figure are as follows:

[0026] 100 - Box body; 110 - First partition; 111 - Hollowed-out part; 1111 - First hollowed-out part; 1112 - Second hollowed-out part; 112 - Partition seal; 120 - Second partition; 130 - Electrical compartment; 140 - Sub-battery compartment; 141 - First sub-battery compartment; 142 - Second sub-battery compartment;

[0027] 200 - Battery pack; 210 - First battery pack; 220 - Second battery pack;

[0028] 300 - Busbar; 310 - First busbar; 320 - Second busbar; 301 - Lead-out section; 302 - Bending section;

[0029] 400 - Battery box cover; 410 - Box cover seal. Detailed Implementation

[0030] This application discloses a battery pack to avoid affecting other battery packs when some battery packs experience thermal runaway, thereby improving the safety of electrical equipment.

[0031] This application also discloses an electrical device having the above-described battery pack.

[0032] Hereinafter, embodiments will be described with reference to the accompanying drawings. The complete contents of the embodiments described below are not limited to those necessary for the solution of the application as described in the claims. It should be noted that, for ease of description, only the parts relevant to the application are shown in the drawings. Unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0033] like Figures 1-5 As shown in the embodiments of this application, the battery pack disclosed includes a battery housing, which includes a housing body 100. The battery housing is typically a closed or semi-closed structure made of materials such as metal or plastic, and serves as the physical carrier of the battery pack. Its design and manufacturing must meet the safety, reliability, and functionality requirements of the battery pack under different usage scenarios.

[0034] The battery enclosure provides installation space for the battery pack, BMS (Battery Management System), cooling system, electrical connection components, etc., and through reasonable structural design, fixes these components in the enclosure body to ensure that they maintain a relatively stable position during battery pack operation, and avoids damage to components or loosening of connections due to vibration, impact and other factors.

[0035] The enclosure body 100 can be cast from materials such as steel plate and aluminum alloy, or it can be made of lightweight materials such as glass fiber reinforced composite materials and carbon fiber reinforced composite materials. The shape of the enclosure body 100 can be cylindrical, cuboid, cube, etc.

[0036] The housing 100 includes a battery compartment and an electrical compartment 130. The core function of the battery compartment is to provide installation space for the battery pack 200. The electrical compartment 130 is the place where the various battery packs in the battery compartment are connected in series and parallel. Through the connection arrangement of the busbar 300 in the electrical compartment 130, different battery packs can be connected according to design requirements to form a circuit system that meets the vehicle's power needs, while controlling and managing the charging and discharging process of the battery.

[0037] The battery compartment and electrical compartment 130 are separated by a first partition 110, and the battery compartment is further divided into at least two independent and sealed sub-battery compartments 140 by a second partition 120. The first partition 110 and the second partition 120 can be designed to be perpendicular, or they can be arranged at other angles. The first partition 110 and the second partition 120 can be glued to the inside of the housing body 100, or they can be welded to the inside of the housing body 100.

[0038] The first partition 110 and the second partition 120 can be the transverse and longitudinal beams inside the box body 100, which serve to separate and enhance the strength of the box body 100. The material can be high-temperature resistant materials such as aluminum alloy, stainless steel, and iron.

[0039] It should be noted that the number of second partitions 120 is not limited to one. Those skilled in the art will understand that the number of second partitions 120 can be designed based on the number of sub-battery compartments 140. One second partition 120 can divide the battery compartment into two sub-battery compartments 140, while two parallel and spaced-apart second partitions 120 can divide the battery compartment into three sub-battery compartments 140. Of course, those skilled in the art can select the specific number of second partitions 120 according to design requirements.

[0040] Multiple sub-battery compartments can each hold multiple battery packs, ensuring that the battery packs operate in a relatively stable and safe environment. Each sub-battery compartment 140 is separated from the electrical compartment 130 by a first partition 110. The first partition 110 has a perforated portion 111, and at least two sub-battery compartments 140 are correspondingly provided with perforated portions 111. At least two sub-battery compartments 140 are connected to the electrical compartment 130 through their corresponding perforated portions 111. A corresponding sub-battery compartment 140 can communicate with the electrical compartment 130 through its corresponding perforated portion 111, ensuring that the current collector within the sub-battery compartment 140 can be introduced into the electrical compartment 130 through the corresponding perforated portion 111.

[0041] For ease of understanding, any two adjacent sub-battery compartments 140 are defined as the first sub-battery compartment 141 and the second sub-battery compartment 142, respectively. The hollow portion 111 corresponding to the first sub-battery compartment 141 is defined as the first hollow portion 1111, and the hollow portion 111 corresponding to the second sub-battery compartment 142 is defined as the second hollow portion 1112 (e.g., ...). Figure 8 (As shown).

[0042] The first busbar 310 of the first sub-battery compartment 141 is introduced into the electrical compartment 130 through the first perforation 1111. That is, the battery pack in the first sub-battery compartment 141 is the first battery pack 210, and the busbar 310 introduced into the electrical compartment 130 through the first perforation 1111 is the first busbar 310.

[0043] The second busbar 320 of the second sub-battery compartment 142 is introduced into the electrical compartment 130 through the second perforation 1112. That is, the battery pack in the second sub-battery compartment 142 is the second battery pack 220, and the busbar 320 introduced into the electrical compartment 130 through the second perforation 1112 is the second busbar 320. The first busbar 310 and the second busbar 320 can be selectively connected in series or parallel within the electrical compartment 130 and connected to corresponding electrical components to achieve charging and discharging. In other words, the battery packs in adjacent sub-battery compartments 140 are connected in series or parallel through the first busbar 310 and the second busbar 320, and the series and parallel states can be switched as needed.

[0044] The series and parallel connection relationship between battery packs can be selected and switched using appropriate circuits and switches. When high-voltage transmission is required to increase the battery charge and discharge rate, the battery packs can be switched to a series circuit via a switch, making the battery packs connected in series. When there is a safety risk in one battery pack, or only one battery pack needs to be charged and discharged, the switch is used to switch to a parallel circuit, making the battery packs connected in parallel.

[0045] Busbars (such as the first busbar 310 and the second busbar 320) are used to electrically connect multiple battery packs, enabling series and parallel connections between them. They can electrically connect the output terminals of one battery pack to the output terminal of another battery pack. The busbars can be made of materials such as copper or gold.

[0046] The first busbar 310 and the second busbar 320 are sealed to the first partition 110 at their respective cutouts 111 via partition seals 112 to prevent the first sub-battery compartment 141 and the second sub-battery compartment 142 from communicating with the electrical compartment 130 through the cutouts 111. The distance between the partition seals 112 corresponding to the first cutout 1111 and the second cutout 1112 ranges from 30mm to 700mm. For example, the above distance range can be 30mm, 50mm, 100mm, 150mm, 200mm, 250mm, 300mm, 350mm, 400mm, 450mm, 500mm, 550mm, 600mm, 650mm, 700mm, etc.

[0047] The partition seal 112 is used to achieve a sealing function, sealing the gap between the manifold (first manifold 310 and second manifold 320) and the hollow portion 111 of the first partition 110 to prevent gas leakage. The material of the partition seal 112 can be sealant, gasket, etc. The sealant can be silicone sealant, polyurethane sealant, or epoxy resin sealant, etc., and the gasket can be EPDM rubber, fluororubber, etc. If the partition seal 112 is fixed to the first partition 110 by welding, the partition seal 112 can be metal.

[0048] It should be noted that the distance between the partition seals 112 corresponding to the first hollow portion 1111 and the second hollow portion 1112 refers to the distance between two adjacent partition seals 112 along the arrangement direction of the first sub-battery compartment 141 and the second sub-battery compartment 142. The battery pack disclosed in this application embodiment has its battery compartment divided into at least two independently sealed sub-battery compartments 140 by a second partition 120. A busbar within the sub-battery compartment 140 is introduced into the electrical compartment 130 through the hollow portion 111 to achieve series and / or parallel connection of the battery packs within the electrical compartment 130. Simultaneously, the busbar is sealed to the first partition 110 at the hollow portion 111. Each sub-battery compartment 140 is independently sealed, and when abnormal conditions such as thermal runaway occur in some of the battery packs within a sub-battery compartment 140, it can effectively prevent high-temperature gas from diffusing to other sub-battery compartments 140, reducing safety risks.

[0049] Even when some sub-battery compartments 140 malfunction, the vehicle can still continue to operate using the power provided by the other normal sub-battery compartments 140, ensuring that the vehicle can be driven to a safe area or that the doors can be opened normally, thus ensuring that the vehicle's critical functions are not significantly affected and buying time for escape. In this application, adjacent sub-battery compartments 140 each have their corresponding perforated portions 111 leading out the busbar, reducing the mutual interference between their respective sealing positions, ensuring the sealing effect between the two sub-battery compartments 140, and improving the safety performance of the battery pack.

[0050] In this embodiment, the distance between the partition seal 112 corresponding to the first hollow portion 1111 and the second hollow portion 1112 is selected within the range of 30mm to 700mm. This ensures that the distance between the first and second busbars is not too close, which would cause vibration superposition and excessive impact on the corresponding hollow portion sealing position, leading to sealing failure. At the same time, it also ensures that the distance between the first and second busbars is not too far, which would result in a long busbar length and an excessively long current transmission path for the battery pack.

[0051] It should be noted that the battery pack in the sub-battery compartment has two positive and two negative current-carrying components, namely the first current-carrying component 310 includes two positive and two negative current-carrying components. These two positive and negative current-carrying components can be introduced into the electrical compartment 130 through the same first hollow part 1111, or they can be introduced into the electrical compartment 130 through different first hollow parts 1111.

[0052] Correspondingly, the second busbar 320 includes positive and negative busbars, which can be introduced into the electrical compartment 130 through the same second cutout 1112 or through different second cutouts 1112.

[0053] like Figure 6 and Figure 7 As shown, in a specific embodiment of this application, the first busbar 310 and / or the second busbar 320 are sealed to the first partition 110 via a partition seal 112. That is, after the first busbar 310 and the second busbar 320 are led out from their respective perforated portions 111, a partition seal 112 is provided at the gap between the busbar (first busbar 310 and second busbar 320) and the corresponding perforated portion 111 to fix the first busbar 310 and the second busbar 320, while maintaining a seal on the corresponding perforated portion 111. This prevents high-temperature gas generated after thermal runaway in one of the first sub-battery compartments 141 and 142 from entering the other through the corresponding perforated portion 111 and affecting the battery packs in other sub-battery compartments.

[0054] On the large surface of the first separator 110, the cross-sectional area of ​​the first busbar 310 is S1mm. 2 The cross-sectional area of ​​the partition seal 112 that mates with the first manifold 310 is S2mm. 2 Therefore, the range of S1 / S2 is 0.25 to 0.6. For example, S1 / S2 can be 0.25, 0.28, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, etc. Those skilled in the art can choose the specific ratio of S1 / S2 based on their needs.

[0055] The large surface of the first partition 110 refers to the largest surface of the first partition 110. The first partition 110 is used to separate the battery compartment and the electrical compartment 130. The large surface of the first partition 110 is perpendicular to the arrangement direction of the battery compartment and the electrical compartment 130.

[0056] In this embodiment, the range of S1 / S2 is 0.25 to 0.6. Given a fixed cross-sectional area of ​​the first hollow portion 1111, this embodiment selects S1 / S2 within the range of 0.25 to 0.6. This prevents the problem of poor flow capacity caused by a small cross-sectional area of ​​the first busbar 310 due to an excessively small S1 / S2; it also prevents the problem of poor sealing effect caused by a small cross-sectional area of ​​the partition seal 112 due to an excessively large S1 / S2.

[0057] The cross-sectional area of ​​the second busbar 320 is S3mm. 2 The cross-sectional area of ​​the partition seal 112 that mates with the second busbar 320 is S4mm. 2 Therefore, the range of S3 / S4 is 0.25 to 0.6. For example, S3 / S4 can be 0.25, 0.28, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, etc. Those skilled in the art can select the specific ratio of S1 / S2 based on their needs.

[0058] In this embodiment, the range of S3 / S4 is 0.25~0.6. Given a fixed cross-sectional area of ​​the second hollow portion 1112, selecting S3 / S4 within the range of 0.25~0.6 in this embodiment can prevent the problem of poor flow capacity caused by a small cross-sectional area of ​​the second busbar 320 due to an excessively small S3 / S4; it can also prevent the problem of poor sealing effect caused by a small cross-sectional area of ​​the partition seal 112 due to an excessively large S1 / S2.

[0059] Furthermore, S1mm 2 It can be 50mm 2 ~400mm 2 For example, S1mm 2 It can be 50mm 2 80mm 2 120mm 2 180mm 2 240mm 2 300mm 2 350mm 2 400mm 2 Etc. Those skilled in the art can select S1mm based on design requirements. 2 The specific values ​​are not limited to the examples mentioned above.

[0060] S2mm 2 It can be 150mm 2 ~700mm 2 For example, S2mm 2 It can be 150mm 2 180mm 2220mm 2 280mm 2 340mm 2 400mm 2 450mm 2 500mm 2 540mm 2 600mm 2 650mm 2 700mm 2 Those skilled in the art can select S2mm based on design requirements. 2 The specific values ​​are not limited to the examples mentioned above.

[0061] S3mm 2 It can be 50mm 2 ~400mm 2 For example, S3mm 2 It can be 50mm 2 80mm 2 120mm 2 180mm 2 240mm 2 300mm 2 350mm 2 400mm 2 Those skilled in the art can select S3mm based on design requirements. 2 The specific values ​​are not limited to the examples mentioned above.

[0062] S4mm 2 It can be 150mm 2 ~700mm 2 For example, S4mm 2 It can be 150mm 2 180mm 2 220mm 2 280mm 2 340mm 2 400mm 2 450mm 2 500mm 2 540mm 2 600mm 2 650mm 2 700mm 2 Those skilled in the art can select S4mm based on design requirements. 2 The specific values ​​are not limited to the examples mentioned above.

[0063] like Figure 6As shown in a specific embodiment of this application, the battery box includes a battery box cover 400 installed on the box body 100. The battery box cover 400 closes the opening side of the box body 100 to maintain the airtightness of the battery box.

[0064] At least one cutout portion 111 is located at the top of the first partition 110 (the top being the side facing the battery box cover 400), that is, the cutout portion 111 has an opening that penetrates the side of the first partition 110 facing the battery box cover 400, so that the top of the cutout portion 111 is in a through-open state. For example, the first cutout portion 1111 and / or the second cutout portion 1112 have openings that penetrate the side of the first partition 110 facing the battery box cover 400.

[0065] A cover seal 410 is provided on the side of the battery box cover 400 facing the box body 100. In addition to sealing the top of the side wall of the box body 100, the cover seal 410 can also seal the first partition 110 and the second partition 120, so that each sub-battery compartment 140 and the electrical compartment are independently sealed to each other.

[0066] The battery box cover 400 is sealed to the first partition 110 via a cover seal 410, which also seals the openings of the cutouts 111 (first cutout 1111 and / or second cutout 1112). That is, while the cover seal 410 is in contact with and sealed to the first partition 110, the openings of the corresponding cutouts 111 are also sealed. In this embodiment, when the cutouts 111 are positioned at the top of the first partition 110, it facilitates their creation, and the cover seal 410 on the battery box cover 400 can be used to seal the openings at the top of the cutouts 111.

[0067] It should be noted that the cover seal 410 is used to seal the battery box cover 400 and the box body 100, isolating the inside of the battery box from the external environment. Its materials can be rubber seals, adhesive seals, or foam seals, etc. Rubber seals can be made of EPDM rubber, silicone rubber, fluororubber, etc.; adhesive seals can be made of polyurethane seals, silicone seals, epoxy resin seals, etc.; and foam seals can be made of acrylic foam, polyethylene foam, foamed silicone, etc.

[0068] Since the perforated portion 111 is located at the top of the first partition 110, the first busbar 310 and the second busbar 320 are fixed at a relatively high position on the first partition 110, resulting in a larger vibration amplitude during vibration. This larger vibration amplitude will affect the sealing effect of the corresponding perforated portion 111. Based on this, in this embodiment, the distance between the partition seal 112 corresponding to the first perforated portion 1111 and the second perforated portion 1112 is selected within the range of 50mm to 700mm. That is, the lower limit of the above distance is increased, so that the distance is selected within a larger value, in order to reduce the vibration amplitude when the first busbar 310 and the second busbar 320 vibrate together, thereby reducing the impact of the busbar vibration on the sealing position and improving the sealing effect.

[0069] For example, the above distances can be 50mm, 100mm, 150mm, 200mm, 250mm, 300mm, 350mm, 400mm, 450mm, 500mm, 550mm, 600mm, 650mm, 700mm, etc.

[0070] In one specific embodiment of this application, along the arrangement direction of the battery box cover 400 and the box body 100, the distance between the first busbar 310 and the battery box cover 400 is 1mm to 20mm. The distance between the first busbar 310 and the battery box cover 400 can be 1mm, 3mm, 5mm, 7mm, 9mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, etc. Those skilled in the art can select specific values ​​of the above distances within the range of 1mm to 20mm based on design requirements, and are not limited to the specific examples described above.

[0071] In this embodiment, the distance between the first busbar 310 and the battery box cover 400 is controlled within the range of 1mm to 20mm. This avoids the problem that the first busbar 310 may vibrate due to the vibration of the battery box cover 400 if the distance between the first busbar 310 and the battery box cover 400 is too small, thus causing the seal to fail. It also avoids the problem that the cross-sectional area of ​​the first busbar 310 may be too small if the distance between the first busbar 310 and the battery box cover 400 is too large when the cross-sectional area of ​​the first hollow part 1111 is fixed, resulting in poor current flow performance. Furthermore, it can also avoid the problem of the first busbar 310 vibrating due to the vibration of the battery box bottom plate, which would cause the seal to fail, because the distance between the first busbar 310 and the side of the first hollow portion 1111 away from the battery box cover 400 is too small. It can also avoid the problem of the first busbar 310 having a small cross-sectional area and poor current flow performance due to the distance between the first busbar 310 and the side of the first hollow portion 1111 away from the battery box cover 400 being too large when the cross-sectional area of ​​the first hollow portion 1111 is constant.

[0072] Correspondingly, along the arrangement direction of the battery box cover 400 and the box body 100, the distance between the second busbar 320 and the battery box cover 400 is 1mm to 20mm. The distance between the second busbar 320 and the battery box cover 400 can be 1mm, 3mm, 5mm, 7mm, 9mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, etc. Those skilled in the art can select specific values ​​of the above distances within the range of 1mm to 20mm based on design requirements, and are not limited to the specific examples mentioned above.

[0073] In this embodiment, the distance between the second busbar 320 and the battery box cover 400 is controlled within the range of 1mm to 20mm. This avoids the problem of the second busbar 320 vibrating due to the vibration of the battery box cover 400, which would cause the seal to fail, if the distance between the second busbar 320 and the battery box cover 400 is too small. It also avoids the problem of the second busbar 320 having a small cross-sectional area due to the distance between the second busbar 320 and the battery box cover 400 being too large, which would result in poor current flow performance, given that the cross-sectional area of ​​the second hollow portion 1112 is constant. Furthermore, it can also avoid the problem of the second busbar 320 vibrating due to the vibration of the battery box bottom plate, which would cause the seal to fail, because the distance between the second busbar 320 and the side of the second hollow portion 1112 away from the battery box cover 400 is too small. It can also avoid the problem of the second busbar 320 having a small cross-sectional area and poor current flow performance due to the distance between the second busbar 320 and the side of the second hollow portion 1112 away from the battery box cover 400 being too large when the cross-sectional area of ​​the second hollow portion 1112 is constant.

[0074] In a specific embodiment of this application, the first busbar 310 and / or the second busbar 320 are sealed to the first partition 110 through a partition seal 112. The partition seal 112 is disposed in the hollow portion 111 to fill the gap between the first busbar 310 and the second busbar 320 in the hollow portion 111, thereby sealing the hollow portion 111.

[0075] The thickness ratio of the partition seal 112 to the cover seal 410 is 1:3 to 1:1. Exemplary thickness ratios of the partition seal 112 to the cover seal 410 can be 1:3, 1:2.5, 1:2, 1:1.5, 1:1, etc. Those skilled in the art can select specific values ​​of the above thickness ratios within the range of 1:3 to 1:1 based on design requirements, and are not limited to the specific examples described above.

[0076] It should be noted that both the separator seal 112 and the cover seal 410 are flexible seals, and their sealing ability is related to their thickness. In this embodiment, the thickness ratio of the separator seal 112 to the cover seal 410 is controlled within the range of 1:3 to 1:1. This avoids the problem that if the thickness ratio is too large, the cover seal 410 will be too thin, which could easily lead to sealing failure at the position between the battery cover and the first separator 110. It also avoids the problem that if the thickness ratio is too small, the cover seal 410 will be too thick, resulting in an excessively large overall height of the battery pack and affecting space utilization.

[0077] In this embodiment, the thickness of the partition seal 112 can be from 1.5mm to 4.5mm. The thickness of the partition seal 112 can be 1.5mm, 1.8mm, 2mm, 2.5mm, 2.8mm, 3mm, 3.5mm, 3.5mm, 4mm, 4.5mm, etc. Those skilled in the art can select specific values ​​of the above thickness within the range of 1.5mm to 4.5mm based on design requirements, and are not limited to the specific examples described above.

[0078] The thickness of the cover seal 410 can be from 2mm to 7mm. The thickness of the cover seal 410 can be 2mm, 2.5mm, 2.8mm, 3mm, 3.5mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, etc. Those skilled in the art can select specific values ​​of the above thicknesses within the range of 2mm to 7mm based on design requirements, and are not limited to the specific examples mentioned above.

[0079] In a specific embodiment of this application, the first busbar 310 is sealed to the first partition 110 via a partition seal 112 disposed on the first hollow portion 1111, and the second busbar 320 is sealed to the first partition 110 via a partition seal 112 disposed on the second hollow portion 1112. The thickness h1 of the partition seal 112 on the first hollow portion 1111 and the thickness h2 of the partition seal 112 on the second hollow portion 1112 satisfy: |h1-h2|≤0.2mm. For example, |h1-h2| can be 0.2mm, 0.15mm, 0.1mm, 0.05mm, 0mm, etc.

[0080] In this embodiment, |h1-h2| is controlled within a range of no more than 0.2mm, which can avoid the problem that the sealing effect of the partition seal 112 corresponding to the two hollow parts 111 is too different due to the excessive thickness difference of the partition seal 112 at the first hollow part 1111 and the second hollow part 1112.

[0081] like Figure 7As shown in a specific embodiment of this application, the battery box includes a battery box cover 400 mounted on the box body 100. The side of the first partition 110 facing the battery box cover 400 is the first partition side, and the side opposite to the first partition side is the second partition side. When the battery box is placed horizontally and the battery box cover 400 is on the upper side, the first partition side is the top of the first partition 110, and the second partition side is the bottom of the first partition 110.

[0082] Correspondingly, the side of the perforated portion 111 facing the battery box cover 400 is the first side of the perforated portion, and the side opposite to the first side of the perforated portion is the second side of the perforated portion. When the battery box is placed horizontally and the battery box cover 400 is on top, the first side of the perforated portion is the top of the perforated portion 111, and the second side of the perforated portion is the bottom of the perforated portion 111. The distance between the first side of the perforated portion and the first side of the partition is amm. At least one perforated portion 111 has a distance amm greater than 0mm from the first side of the perforated portion to the first side of the partition, meaning that at least one perforated portion 111 has its first side of the perforated portion spaced apart from the first side of the partition.

[0083] The distance between the first cutout portion 1111 and the second cutout portion 1112 ranges from 30mm to 600mm. For example, the above distance can be 30mm, 50mm, 100mm, 150mm, 200mm, 250mm, 300mm, 350mm, 400mm, 450mm, 500mm, 550mm, 600mm, etc.

[0084] In this embodiment, by ensuring that the distance amm from the first side of the perforated portion 111 to the first side of the partition is greater than 0mm, the installation height of the manifold corresponding to the perforated portion 111 can be reduced, thereby reducing the impact of the manifold vibration on the sealing area and improving the sealing effect. Therefore, the distance between the two perforated portions 111 can be reduced. In this embodiment, the distance between the first perforated portion 1111 and the second perforated portion 1112 can be selected within the range of 30mm to 600mm, while still ensuring the corresponding sealing performance.

[0085] When the distance 'amm' between the first side of the first hollow portion 1111 and the first side of the partition plate is greater than 0mm, the distance between the first hollow portion 1111 and the second hollow portion 1112 is in the range of 30mm to 600mm. That is, when both the first hollow portion 1111 and the second hollow portion 1112 are located below the first side of the partition plate, the distance between the first hollow portion 1111 and the second hollow portion 1112 can be further reduced. In this embodiment, the distance between the first hollow portion 1111 and the second hollow portion 1112 can be selected within the range of 30mm to 600mm.

[0086] The distance from the second side of the perforated portion to the second side of the partition is bmm. Both amm and bmm in the perforated portion 111 are greater than 0mm, and amm > bmm, meaning the perforated portion is positioned slightly lower to reduce the influence of hot air. 1 < a / b ≤ 5. For example, a / b can be 1.1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, etc. Those skilled in the art can select specific values ​​of the above ratio within the range of 1 (excluding 1) to 5 based on design requirements, and are not limited to the specific examples described above.

[0087] In this embodiment, selecting a / b within the range of 1 to 5 avoids the problem that if the distance between the first side of the perforated portion and the first side of the partition is too small, the top strength of the first partition 110 in the area where the perforated portion 111 is opened will be poor, making it easy to break during vibration and affecting the sealing effect. Therefore, the distance between the first perforated portion 1111 and the second perforated portion 1112 can be reduced. It also avoids the problem that if the distance between the first side of the perforated portion and the first side of the partition is too large when determining the position of the second side of the perforated portion, the perforated portion 111 will be too small, resulting in a smaller cross-sectional area of ​​the first busbar 310 and the second busbar 320, which would affect the flow.

[0088] In addition, by selecting a / b within the range of 1 to 5 in this embodiment, the problem of the first separator 110 having poor strength at the bottom of the area where the perforated part 111 is opened is avoided due to the distance between the second side of the perforated part and the second side of the partition being too small, which would make it easy to break during vibration and affect the sealing effect. It can also avoid the problem of the perforated part 111 being too small due to the distance between the second side of the perforated part and the second side of the partition being too large when the position of the first side of the perforated part is determined, which would make the cross-sectional area of ​​the first busbar 310 and the second busbar 320 smaller and affect the flow.

[0089] In this embodiment, bmm can be 3mm to 70mm. For example, bmm can be 3mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, etc. Those skilled in the art can choose a specific value of bmm within the range of 3mm to 70mm based on design requirements, and are not limited to the specific examples mentioned above.

[0090] amm can range from 5mm to 80mm. For example, amm can be 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, etc. Those skilled in the art can choose a specific value of amm within the range of 5mm to 80mm based on design requirements, and are not limited to the specific examples mentioned above.

[0091] On the large surface of the first partition 110, the sum of the areas of each hollow part is 50 mm. 2 The large surface area of ​​the first partition 110 is S0'mm. 2 The range of S0 / S0' is 0.007 to 0.1. For example, S0 / S0' can be 0.007, 0.01, 0.03, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, etc. Those skilled in the art can select specific values ​​for S0 / S0' within the range of 0.007 to 0.1 based on design requirements, and are not limited to the specific examples mentioned above.

[0092] In this embodiment, the ratio S0 / S0' is selected within the range of 0.007 to 0.1. This avoids the problem that an excessively large ratio would result in an overly large opening area on the first separator 110, leading to reduced strength of the battery casing and increased susceptibility to cracking and sealing failure. Conversely, an excessively small ratio would affect the installation space of the busbar, resulting in a small cross-sectional area and poor battery current flow. This configuration in this embodiment ensures better strength of the first separator 110, allowing for a smaller distance between the first hollow portion 1111 and the second hollow portion 1112. In this embodiment, the distance between the first hollow portion 1111 and the second hollow portion 1112 can be selected within the range of 30mm to 550mm. For example, the distance can be 30mm, 50mm, 100mm, 150mm, 200mm, 250mm, 300mm, 350mm, 400mm, 450mm, 500mm, 550mm, etc.

[0093] In this embodiment, S0mm 2 200mm 2 ~1000mm 2 For example, S0mm 2 It can be 200mm 2 250mm 2 300mm 2 350mm 2 400mm 2 450mm 2 500mm 2 550mm 2 600mm 2 650mm 2 700mm 2 750mm 2 800mm 2 850mm 2 900mm 2 950mm 2 1000mm2 Etc. Those skilled in the art can select S0mm based on design requirements. 2 The specific values ​​are not limited to the examples mentioned above.

[0094] S0'mm 2 7000mm 2 ~140000mm 2 For example, S0'mm 2 It can be 7000mm 2 7500mm 2 8000mm 2 8500mm 2 9000mm 2 9500mm 2 10000mm 2 11000mm 2 12000mm 2 13000mm 2 140000mm 2 Etc. Those skilled in the art can select S0mm based on design requirements. 2 The specific values ​​are not limited to the examples mentioned above.

[0095] Furthermore, on the large surface of the first partition 110, the area ratio of the first hollow portion 1111 to the second hollow portion 1112 is 0.5 to 2. For example, the area ratio of the first hollow portion 1111 to the second hollow portion 1112 can be 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.2, 1.4, 1.6, 1.8, 2, etc. Those skilled in the art can select specific values ​​of the above area ratio within the range of 0.5 to 2 based on design requirements, and are not limited to the specific examples described above. When the area ratio of the first hollow portion 1111 to the second hollow portion 1112 is within the above range, both the sealing and the flow capacity of the manifold are good.

[0096] In one specific embodiment of this application, the distance between the first busbar 310 and the side of the first partition 110 furthest from the battery cover 400 is cmm. The distance between the second busbar 320 and the side of the first partition 110 furthest from the battery cover 400 is dmm.

[0097] The range of cmm is 4.5mm to 80mm. For example, cmm can be 4.5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, etc. Those skilled in the art can select a specific value of cmm within the range of 4.5mm to 80mm based on design requirements, and are not limited to the specific examples mentioned above.

[0098] The dmm range is 4.5mm to 80mm. For example, dmm can be 4.5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, etc. Those skilled in the art can select a specific value of dmm within the range of 4.5mm to 80mm based on design requirements, and are not limited to the specific examples mentioned above.

[0099] In this embodiment, selecting cmm and dmm within the range of 4.5mm to 80mm can avoid the problem that if cmm and dmm are too small, the bottom strength of the first separator 110 will be poor, making it easy to break when impacted by foreign objects, thus affecting the sealing performance. It can also avoid the problem that if cmm and dmm are too large, it will easily lead to sealing failure in the event of thermal runaway (due to the rising of hot air, if the installation position of the first busbar 310 and the second busbar 320 is high, the high temperature gas can easily damage the seal in the event of thermal runaway, leading to sealing failure), which would make it easy for high temperature gas to enter other sub-battery compartments and affect safety.

[0100] When cmm and dmm are equal, the distance between the first cutout portion 1111 and the second cutout portion 1112 ranges from 50mm to 700mm. For example, the above distance can be 50mm, 100mm, 150mm, 200mm, 250mm, 300mm, 350mm, 400mm, 450mm, 500mm, 550mm, 600mm, 650mm, 700mm, etc.

[0101] When the first busbar 310 and the second busbar 320 are installed at the same height, the length of the busbars of each battery pack can be reduced during the series and / or parallel connection of the battery packs, thereby reducing the current path and improving the current carrying capacity. However, the busbars being at the same height can easily cause resonance, which increases the vibration amplitude and thus increases the impact on the seal. Therefore, in this embodiment, the distance between the first hollow portion 1111 and the second hollow portion 1112 is selected within the range of 50mm to 700mm, that is, increasing the distance between the first hollow portion 1111 and the second hollow portion 1112, and increasing the spacing between adjacent separator seals 112 of the electrode tab, so as to reduce the probability of seal failure.

[0102] When cmm and dmm are not equal, |cd|≤60mm. |cd| can be 60mm, 50mm, 40mm, 30mm, 20mm, 10mm, 0mm, etc.

[0103] This configuration avoids the problem of excessively long flow paths when the first busbar 310 and the second busbar 320 are connected in series and / or in parallel within the electrical compartment due to an excessively large height difference between them; it also avoids the problem of mutual vibration interference between the first busbar 310 and the second busbar 320 due to an excessively small height difference between them, resulting in large vibration amplitudes and affecting the seal.

[0104] like Figure 9 As shown in a specific embodiment of this application, the plane containing the large surfaces of the first busbar 310 and / or the second busbar 320 is perpendicular to the large surface of the housing body 100. The cross-sections of the first busbar 310 and the second busbar 320 are typically rectangular, and the large surface of the first busbar 310 and the second busbar 320 refers to their largest surface area; correspondingly, the large surface of the housing body 100 refers to its largest surface area, which is typically parallel to the surface of the battery housing bottom plate. In this embodiment, the plane containing the large surfaces of the first busbar 310 and the second busbar 320 is designed to be perpendicular to the large surface of the housing body 100, and the distance between the two partition seals 112 is in the range of 100mm~700mm, which gives the first busbar 310 and the second busbar 320 greater rigidity in the height direction, which can reduce the vibration of the first busbar 310 and the second busbar 320, reduce the impact of vibration on the sealing position, and improve the sealing effect.

[0105] like Figure 10As shown, in another embodiment of this application, the plane containing the large surfaces of the first busbar 310 and / or the second busbar 320 is parallel to the large surface of the housing body 100. The distance between the first side of the hollow portion and the first side of the partition is amm. The battery housing includes a battery cover 400 mounted on the housing body 100. The side of the first partition 110 facing the battery cover 400 is the first side of the partition, and the side of the hollow portion 111 facing the battery cover 400 is the first side of the hollow portion. The range of amm is 10mm to 70mm. For example, amm can be 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, etc. Those skilled in the art can select a specific value of amm within the range of 10mm to 70mm based on design requirements, and are not limited to the specific examples mentioned above.

[0106] In this embodiment, the plane containing the large surfaces of the first busbar 310 and the second busbar 320 is designed to be parallel to the large surface of the box body 100. This can reduce the size of the first hollow portion 1111 and the second hollow portion 1112 in the height direction (the arrangement direction of the battery box cover and the box body), thereby increasing the strength of the first partition 110, reducing the vibration of the first partition 110, and improving the sealing effect at the hollow portion 111.

[0107] like Figure 11 As shown in a specific embodiment of this application, at least one of the first busbar 310 and the second busbar 320 includes a lead-out portion 301 and a bending portion 302. The included angle between the lead-out portion 301 and the bending portion 302 is in the range of 80° to 100°, and they are smoothly transitioned through a transition portion, which is an arc transition portion with a radius of emm. For example, the included angle between the lead-out portion 301 and the bending portion 302 is in the range of 80°, 83°, 86°, 88°, 90°, 93°, 96°, 98°, 100°, etc.

[0108] When both the first busbar 310 and the second busbar 320 include a lead-out portion 301 and a bending portion 302, the bending portions 302 of the first busbar 310 and the second busbar 320 can be bent to the same side or to opposite sides. When bending to opposite sides, they can be bent in a direction that brings them closer to each other or in a direction that moves them further away from each other.

[0109] The lead-out portion 301 is introduced into the electrical compartment 130 through the cutout portion 111, and the bent portion 302 is located in the sub-battery compartment 140. The lead-out portion 301 and the bent portion 302 are at a certain angle. Taking the lead-out portion 301 and the bent portion 302 being perpendicular as an example, when the lead-out portion 301 is perpendicular to the first partition 110, the bent portion 302 is parallel to the first partition 110. This ensures that the bent portion 302, within the sub-battery compartment 140, maintains the same or close distance from the first partition 110 at all its positions, reducing its space occupation within the sub-battery compartment 140. Of course, the lead-out portion 301 and the bent portion 302 can also be at an acute or obtuse angle, which can be selected by those skilled in the art based on design requirements.

[0110] The minimum distance fmm between the bent portion 302 and the first separator 110 is such that emm and fmm satisfy the condition that e×f ranges from 60 to 200. For example, e×f can be 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, etc. Those skilled in the art can select a specific value for e×f within the range of 60 to 200 based on design requirements, and are not limited to the specific examples described above.

[0111] Those skilled in the art will understand that when the bent portion 302 is parallel to the first partition 110, the distance between it and the first partition 110 at all positions is equal. When the bent portion 302 forms an acute angle with the first partition 110, the position closest to the bent portion 302 and the first partition 110 is selected as the minimum distance fmm.

[0112] In this embodiment, by providing a bending portion 302, the first busbar 310 and the second busbar 320 can reduce the length of the lead-out portion 301 passing through the first hollow portion 1111 and the second hollow portion 1112, based on a certain length of the first busbar 310 and the second busbar 320. This reduces the length of the cantilever (the part passing through the first hollow portion 1111 and the second hollow portion 1112 is in a cantilever state). Moreover, the bending portion 302, which bends at a certain angle to the lead-out portion 301, can play a buffering role, reducing the vibration amplitude of the first busbar 310 and the second busbar 320, thereby reducing the impact of the vibration of the first busbar 310 and the second busbar 320 on the sealing position and improving the sealing effect.

[0113] In this embodiment, the radius of the transition section is emm, which is 1.5mm to 8mm. For example, emm can be 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, etc. Those skilled in the art can choose a specific value for emm within the range of 1.5mm to 8mm based on design requirements, and are not limited to the specific examples mentioned above.

[0114] fmm ranges from 10mm to 80mm. For example, fmm can be 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, etc. Those skilled in the art can select a specific value for fmm within the range of 10mm to 80mm based on design requirements, and are not limited to the specific examples mentioned above.

[0115] In this embodiment, selecting emm within the range of 1.5mm to 8mm can avoid the problem that excessive stress concentration in the transition zone due to excessively small emm can cause the first busbar 310 and the second busbar 320 to break during vibration; it can also avoid the problem that excessively large emm can easily cause vibration, affecting the sealing position and increasing the risk of sealing failure. At the same time, the larger the emm, the longer the flow path and the worse the flow capacity.

[0116] In this embodiment, the minimum distance fmm between the bent portion 302 and the first separator 110 is controlled within the range of 10mm to 80mm. This avoids the problem that if fmm is too small, the first busbar 310 and the second busbar 320 will collide with the first separator 110 when they vibrate, which could easily cause the first busbar 310 and the second busbar 320 to break. It also avoids the problem that if fmm is too large, the lead-out portion 301 will be too long, resulting in an excessively long cantilever, which would reduce the vibration damping effect. At the same time, an excessively long cantilever would also increase the current path and affect the current flow of the battery pack.

[0117] This application discloses an electrical device that includes the battery pack disclosed in the above embodiments. This electrical device can be a vehicle, energy storage device, etc. The electrical device disclosed in this application, having the aforementioned battery pack, possesses all the technical effects of the battery pack, which will not be elaborated upon further here.

[0118] Unless the context explicitly indicates an exception, words such as "a," "an," "a kind," and / or "the" do not specifically refer to the singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, which do not constitute an exclusive list; a method or apparatus may also include other steps or elements. An element defined by the phrase "comprising a..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.

[0119] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0120] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0121] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A battery pack, characterized in that, The battery housing includes a housing body (100), which includes a battery compartment and an electrical compartment (130) separated by a first partition (110). The battery compartment is further divided into at least two independent and sealed sub-battery compartments (140) by a second partition (120). The at least two sub-battery compartments (140) are separated from the electrical compartment (130) by the first partition (110). The first partition (110) has a cutout (111) at each of the at least two sub-battery compartments (140). The at least two sub-battery compartments (140) are connected to the electrical compartment (130) through the corresponding cutout (111). One of any two adjacent sub-battery compartments (140) is designated as the first sub-battery compartment (141), and the other as the second sub-battery compartment (142). The perforated portion (111) corresponding to the first sub-battery compartment (141) is designated as the first perforated portion (1111), and the perforated portion (111) corresponding to the second sub-battery compartment (142) is designated as the second perforated portion (1112). The first busbar (310) of the first sub-battery compartment (141) is sealed and introduced into the battery compartment through the first perforated portion (1111). Inside the electrical compartment (130), the second busbar (320) of the second sub-battery compartment (142) is sealed into the electrical compartment (130) through the second hollow part (1112). The first hollow part (1111) and the second hollow part (1112) are respectively sealed with the corresponding first busbar (310) and second busbar (320) through the partition seal (112), and the distance between the two partition seals (112) is 30mm~700mm.

2. The battery pack as described in claim 1, characterized in that, The battery housing includes a battery cover (400) mounted on the housing body (100), and the first cutout portion (1111) and / or the second cutout portion (1112) have an opening that passes through the side of the first partition (110) facing the battery cover (400). The battery box cover (400) is provided with a box cover seal (410) on the side facing the box body (100). The battery box cover (400) is sealed to the first partition (110) through the box cover seal (410). The openings of the first hollow part (1111) and / or the second hollow part (1112) are sealed by the box cover seal (410). The distance between the partition seals (112) corresponding to the first hollow part (1111) and the second hollow part (1112) is in the range of 50mm to 700mm.

3. The battery pack as described in claim 2, characterized in that, Along the arrangement direction of the battery box cover (400) and the box body (100), the distance between the first busbar (310) and the battery box cover (400) is 1mm~20mm; And / or, Along the arrangement direction of the battery box cover (400) and the box body (100), the distance between the second busbar (320) and the battery box cover (400) is 1mm~20mm.

4. The battery pack as described in claim 2, characterized in that, The first manifold (310) and / or the second manifold (320) are sealed to the first partition (110) through the partition seal (112), and the thickness ratio of the partition seal (112) to the cover seal (410) is 1:3 to 1:

1.

5. The battery pack as described in claim 4, characterized in that, The thickness of the partition seal (112) is 1.5mm to 4.5mm; and / or the thickness of the box cover seal (410) is 2mm to 7mm.

6. The battery pack as described in claim 2, characterized in that, The first busbar (310) is sealed to the first partition (110) through a partition seal (112) provided on the first hollow part (1111), and the second busbar (320) is sealed to the first partition (110) through a partition seal (112) provided on the second hollow part (1112); The thickness h1 of the partition seal (112) on the first hollow part (1111) and the thickness h2 of the partition seal (112) on the second hollow part (1112) satisfy: |h1-h2|≤0.2mm.

7. The battery pack as described in claim 1, characterized in that, The battery box includes a battery box cover (400) mounted on the box body (100). The side of the first partition (110) facing the battery box cover (400) is the first side of the partition, and the side opposite to the first side of the partition is the second side of the partition. The side of the hollow part (111) facing the battery box cover (400) is the first side of the hollow part, and the side opposite to the first side of the hollow part is the second side of the hollow part. At least one of the hollowed-out portions has its first side spaced apart from the first side of the partition plate, and the distance between the first hollowed-out portion (1111) and the second hollowed-out portion (1112) is in the range of 30mm to 600mm.

8. The battery pack as described in claim 7, characterized in that, The two hollowed-out portions are spaced apart from the first side of the partition plate, and the distance between the first hollowed-out portion (1111) and the second hollowed-out portion (1112) is 30mm to 500mm.

9. The battery pack as described in claim 7, characterized in that, The distance between the first side of the hollowed-out portion and the first side of the partition is amm, and the distance between the second side of the hollowed-out portion and the second side of the partition is bmm. Both amm and bmm are greater than 0mm, and amm > bmm, and 1 < a / b ≤ 5.

10. The battery pack as claimed in claim 9, characterized in that, amm is 5mm~80mm, and / or bmm is 3mm~70mm.

11. The battery pack as claimed in claim 1, characterized in that, On the large surface of the first separator (110), the sum of the areas of each of the hollowed-out portions is 50 mm. 2 The large surface area of ​​the first separator (110) is S0' mm. 2 The range of S0 / S0' is 0.007~0.

1.

12. The battery pack as claimed in claim 11, characterized in that, S0mm 2 200mm 2 ~1000mm 2 And / or, S0'mm 2 7000mm 2 ~140000mm 2 ; and / or, the distance between the first hollow portion (1111) and the second hollow portion (1112) is in the range of 30mm to 550mm.

13. The battery pack as claimed in claim 11, characterized in that, On the large surface of the first partition (110), the ratio of the area of ​​the first hollow part (1111) to the area of ​​the second hollow part (1112) is 0.5~2.

14. The battery pack as claimed in claim 1, characterized in that, The battery enclosure includes a battery cover (400) mounted on the enclosure body (100), the distance between the first busbar (310) and the side of the first partition (110) away from the battery cover (400) is cmm; and / or, the distance between the second busbar (320) and the side of the first partition (110) away from the battery cover (400) is dmm; The range of cmm is 4.5mm to 80mm, and the range of dmm is 4.5mm to 80mm.

15. The battery pack as claimed in claim 14, characterized in that, cmm and dmm are equal, and the distance between the first hollow part (1111) and the second hollow part (1112) is 50mm to 700mm.

16. The battery pack as claimed in claim 14, characterized in that, cmm and dmm are not equal, |cd|≤60mm.

17. The battery pack as claimed in claim 1, characterized in that, The first busbar (310) and / or the second busbar (320) are sealed to the first partition (110) via a partition seal (112); On the large surface of the first separator (110), the cross-sectional area of ​​the first busbar (310) is S1mm. 2 The cross-sectional area of ​​the partition seal (112) that cooperates with the first manifold (310) is S2mm. 2 The range of S1 / S2 is 0.25~0.6; and / or, on the large surface of the first separator (110), the cross-sectional area of ​​the second busbar (320) is S3mm. 2 The cross-sectional area of ​​the partition seal (112) that mates with the second manifold (320) is S4mm. 2 The range of S3 / S4 is 0.25~0.

6.

18. The battery pack as claimed in claim 17, characterized in that, S1mm 2 50mm 2 ~400mm 2 ; and / or, S2mm 2 150mm 2 ~700mm 2 ; and / or, S3mm 2 50mm 2 ~400mm 2 ; and / or, S4mm 2 150mm 2 ~700mm 2 .

19. The battery pack according to any one of claims 1-18, characterized in that, The plane containing the large surface of the first busbar (310) and / or the second busbar (320) is perpendicular to the large surface of the box body (100), and the distance between the two partition seals (112) is in the range of 100mm~700mm.

20. The battery pack according to any one of claims 1-18, characterized in that, The plane containing the large surface of the first busbar (310) and / or the second busbar (320) is parallel to the large surface of the housing body (100). The battery housing includes a battery cover (400) mounted on the housing body (100). The side of the first partition (110) facing the battery cover (400) is the first side of the partition. The side of the hollow part (111) facing the battery cover (400) is the first side of the hollow part. The distance between the first side of the hollow part and the first side of the partition is amm, and the range of amm is 10mm to 70mm.

21. The battery pack according to any one of claims 1-18, characterized in that, At least one of the first busbar (310) and the second busbar (320) includes a lead-out portion (301) and a bend portion (302), the included angle between the lead-out portion (301) and the bend portion (302) is in the range of 80°~100°, and they are smoothly transitioned by a transition portion, the radius of which is emm; The lead-out part (301) is introduced into the electrical compartment (130) through the hollow part (111), the bent part (302) is located in the sub-battery compartment (140), and the minimum distance between the bent part (302) and the first separator (110) is f mm. Then e and f satisfy: e×f ranges from 60 to 200.

22. The battery pack as claimed in claim 21, characterized in that, The emm range is 1.5mm to 8mm.

23. The battery pack as claimed in claim 21, characterized in that, fmm ranges from 10mm to 80mm.

24. The battery pack according to any one of claims 1-18, characterized in that, The battery packs in the adjacent sub-battery compartments (140) are connected in series or in parallel through the first busbar (310) and the second busbar (320), and the series and parallel states can be switched.

25. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1-24.

Images