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 plate, the battery compartment is divided into at least two mutually independent sealed sub-battery compartments by a second partition plate, the first partition plate is provided with a through part, the first sub-battery compartment and the second sub-battery compartment are communicated with the electrical compartment through the same through part; the first busbar of the first sub-battery compartment is introduced into the electrical compartment through the through part, the second busbar of the second sub-battery compartment is introduced into the electrical compartment through the through part, and the first busbar and the second busbar are sealingly connected with the first partition plate at the through part. The sub-battery compartments are mutually independent and sealed, when abnormal conditions such as thermal runaway occur in the battery pack in some 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 through part, the number of through parts opened on the first partition plate 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 including a housing body, the housing body including a battery compartment and an electrical compartment separated by a first partition, the battery compartment being separated by a second partition into at least two independent and sealed sub-battery compartments, and each of the sub-battery compartments being separated from the electrical compartment by the first partition, the first partition being provided with a through portion, and at least one or two adjacent sub-battery compartments communicating with the electrical compartment through the same through portion;

[0008] The two sub-battery compartments connected to the electrical compartment through the same through-part are a first sub-battery compartment and a second sub-battery compartment. A first busbar of the first sub-battery compartment is introduced into the electrical compartment through the through-part, and a second busbar of the second sub-battery compartment is introduced into the electrical compartment through the through-part. The first busbar and the second busbar are sealed to the first partition at the through-part.

[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. A busbar within each sub-battery compartment is introduced into the electrical compartment via a through-hole to achieve series and parallel connection of the battery packs within the electrical compartment. Simultaneously, the busbar is sealed to the first partition at the through-hole. 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. The fact that adjacent sub-battery compartments in this application have their busbars led out through the same through-hole reduces the number of through-holes on the first partition, lowers the probability of seal failure at the through-holes, and improves the sealing effect between the sub-battery compartments.

[0010] A second aspect of this application provides an electrical device that includes a battery pack as described in any of the preceding claims.

[0011] 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

[0012] 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.

[0013] Figure 1 This is a schematic diagram of the internal structure of the battery pack disclosed in an embodiment of this application;

[0014] Figure 2 This is a top view of the internal structure of the battery pack disclosed in the embodiments of this application;

[0015] Figure 3 for Figure 2 Sectional view along AA;

[0016] Figure 4 This is a schematic diagram of the internal structure of the battery pack disclosed in an embodiment of this application from a top view.

[0017] 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.

[0018] Figure 6This is a diagram showing the fit between the first partition and the battery box cover as disclosed in an embodiment of this application.

[0019] 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.

[0020] Figure 8 This is a front view of the first partition with a baffle disclosed in an embodiment of this application;

[0021] Figure 9 This is a side view of the first partition with a baffle disclosed in an embodiment of this application;

[0022] Figure 10 This is a front view of the first partition through which the busbar is disposed, as disclosed in an embodiment of this application;

[0023] Figure 11 This is a front view of the first partition of the profile structure disclosed in the embodiments of this application;

[0024] Figure 12 This is a schematic diagram of the vertical arrangement of the busbar disclosed in the embodiments of this application;

[0025] Figure 13 This is a schematic diagram of the lateral arrangement of the busbar disclosed in the embodiments of this application;

[0026] Figure 14 This is a schematic diagram of a busbar with a bent portion disclosed in an embodiment of this application.

[0027] The meanings of the various reference numerals in the figure are as follows:

[0028] 100 - Housing body; 110 - First partition; 111 - Through section; 112 - Partition seal; 113 - Baffle; 1131 - First connecting port; 1132 - Second connecting port; 114 - Cavity; 115 - Separating rib; 120 - Second partition; 130 - Electrical compartment; 140 - Sub-battery compartment; 141 - First sub-battery compartment; 142 - Second sub-battery compartment;

[0029] 200 - Battery pack; 210 - First battery pack; 220 - Second battery pack;

[0030] 300 - Busbar; 310 - First busbar; 320 - Second busbar; 301 - Lead-out section; 302 - Bending section;

[0031] 400 - Battery box cover; 410 - Box cover seal. Detailed Implementation

[0032] 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.

[0033] This application also discloses an electrical device having the above-described battery pack.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] The battery box generally includes a box body 100 and a battery box cover 400. The box body 100 includes a bottom plate and a side plate connected to and surrounding the bottom plate. The battery box cover 400 is connected to the side plate and has a cover plate opposite to the bottom plate. The battery box cover 400 and the box body 100 together enclose a receiving chamber.

[0038] The battery casing can be cast from materials such as steel plates and aluminum alloys, or lightweight materials such as glass fiber reinforced composite materials and carbon fiber reinforced composite materials. The shape of the battery casing can be cylindrical, cuboid, cube, etc.

[0039] 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.

[0040] The battery compartment and electrical compartment 130 are separated by a first partition 110, which can be made of the same material as the main body 100. The battery compartment is further divided into at least two independent, 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 arranged at other angles. The first partition 110 and the second partition 120 can be glued to the inside of the main body 100 or welded to the inside of the main body 100. The electrical compartment 130 is a compartment in the battery box for storing electrical components, such as a BMS (Battery Management System) or a BDU (Battery Disconnect Unit).

[0041] 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.

[0042] It should be noted that the number of second separators 120 is not limited to one. Those skilled in the art will understand that the number of second separators 120 can be designed based on the number of sub-battery compartments 140. One second separator 120 can divide the battery compartment into two sub-battery compartments 140, while two parallel and spaced-apart second separators 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 separators 120 according to design requirements.

[0043] 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 through-section 111, through which at least two adjacent sub-battery compartments 140 are connected to the electrical compartment 130. That is, the through-section 111 allows the electrical compartment 130 to simultaneously connect to two adjacent sub-battery compartments 140.

[0044] For ease of understanding, the two sub-battery compartments 140 connected to the electrical compartment 130 via the same through-hole 111 are defined as the first sub-battery compartment 141 and the second sub-battery compartment 142, respectively. The first busbar 310 of the first sub-battery compartment 141 is introduced into the electrical compartment 130 through the through-hole 111. That is, the battery pack in the first sub-battery compartment 141 is the first battery pack 210, and the busbar introduced into the electrical compartment 130 by the first battery pack 210 through the through-hole 111 is the first busbar 310.

[0045] The second busbar 320 of the second sub-battery compartment 142 is introduced into the electrical compartment 130 through the through-hole 111. That is, the battery pack in the second sub-battery compartment 142 is the second battery pack 220, and the busbar introduced into the electrical compartment 130 through the through-hole 111 is the second busbar 320. The first busbar 310 and the second busbar 320 can be selectively connected in series or in parallel in the electrical compartment 130, and connected to the corresponding electrical components to realize charging and discharging.

[0046] 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.

[0047] 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.

[0048] The first busbar 310 and the second busbar 320 are sealed to the first partition 110 at the through-hole 111 to prevent the first sub-battery compartment 141 and the second sub-battery compartment 142 from being connected through the through-hole 111 and the electrical compartment 130. The busbars are used to electrically connect multiple battery packs, enabling series / parallel connection of the battery packs, and can electrically connect the output terminals of the battery packs to the output terminals of the battery stack. The busbars can be made of metal materials such as copper or gold.

[0049] The battery pack disclosed in this application has its battery compartment divided into at least two independently sealed sub-battery compartments 140 by a second partition 120. A busbar within each sub-battery compartment 140 is introduced into an electrical compartment 130 via a through-hole 111, enabling 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 through-hole 111. Since each sub-battery compartment 140 is independently sealed, it effectively prevents high-temperature gases from diffusing into other sub-battery compartments 140 in the event of thermal runaway or other abnormal conditions within some of the battery packs in one sub-battery compartment 140, thus reducing safety risks.

[0050] Even when some sub-battery compartments 140 malfunction, the vehicle can still continue to operate using the power provided by 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 are connected to a busbar via a common through-hole 111, which reduces the number of through-holes 111 on the first partition 110, lowers the probability of seal failure at the through-holes 111, and improves the sealing effect between the sub-battery compartments 140.

[0051] like Figure 6 As shown, in a specific embodiment of this application, both the first busbar 310 and 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 the through portion 111, a partition seal 112 is provided at the gap between the busbars (first busbar 310 and second busbar 320) and the through portion 111 to fix the first busbar 310 and the second busbar 320, while maintaining a seal on the through 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 through portion 111 and affecting the battery packs in other sub-battery compartments.

[0052] The diaphragm seal 112 is used to achieve a sealing function, sealing the gap between the manifold (first manifold 310 and second manifold 320) and the through portion 111 of the first diaphragm 110 to prevent gas leakage. The material of the diaphragm 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 diaphragm seal 112 is fixed to the first diaphragm 110 by welding, the diaphragm seal 112 can be metal.

[0053] On the large surface of the first partition 110, the sum of the cross-sectional areas of the first busbar 310 and the second busbar 320 is S1mm. 2 The cross-sectional area of ​​the partition seal 112 is S2mm. 2 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.

[0054] The diaphragm seal 112 can be a seal located between the manifold and the first diaphragm 110, in which case the cross-sectional area of ​​the diaphragm seal 112 is S2mm. 2The partition seal 112 can also be a seal provided outside the through portion 111. A plastic part is fixed on the first partition 110. In this structure, the partition seal 112 is fixed on the plastic part, and the plastic part and the manifold are sealed together by the seal. In this case, the cross-sectional area of ​​the partition seal 112 is the same as the cross-sectional area of ​​the seal, which is S2mm. 2 .

[0055] In this embodiment, the range of S1 / S2 is 0.01 to 0.25. For example, S1 / S2 can be: 0.01, 0.03, 0.05, 0.07, 0.09, 0.11, 0.13, 0.15, 0.17, 0.19, 0.21, 0.23, 0.25, etc. Given a fixed cross-sectional area of ​​the through portion 111, this embodiment selects S1 / S2 within the range of 0.01 to 0.25. This prevents the problem of poor flow capacity caused by a small cross-sectional area of ​​the first busbar 310 and the second busbar 320 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.

[0056] Those skilled in the art will understand that the cross-sectional area of ​​the through portion 111 on the large surface of the first partition 110 is between 0.01 and 0.25 of the large surface area of ​​the first partition 110. This reduces the problem of insufficient strength of the first partition 110 due to the large proportion mentioned above, and also avoids the problem of poor flow capacity caused by the small cross-sectional area of ​​the first busbar 310 and the second busbar 320 due to the small proportion mentioned above.

[0057] The sum of the cross-sectional areas of the first busbar 310 and the second busbar 320 is S1mm. 2 40mm 2 ~800mm 2 For example, S1mm 2 It can be 40mm 2 100mm 2 150mm 2 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 wait.

[0058] The cross-sectional area of ​​the partition seal 112 is S2mm. 2 3000mm 2 ~8000mm 2 For example, S2mm 2 It can be 3000mm 2 3500 mm 2 4000mm 2 4500mm 2 5000mm 2 5500mm 2 6000mm 2 6500mm 2 7000mm 2 7500mm 2 8000mm 2 wait.

[0059] It should be noted that the battery pack in the sub-battery compartment has both positive and negative busbars. The first busbar 310 may only include a busbar 300 of one polarity from the first sub-battery compartment 141, for example, only a positive busbar or only a negative busbar. The other polarity busbar 300 of the first sub-battery compartment 141 is not introduced into the electrical compartment 130 through the through-part 111, but needs to be introduced into the electrical compartment 130 through other holes. For example, when the two polarity busbars 300 of the sub-battery compartment are far apart, it is not easy to lead them out through the same through-part 111. In this case, only the busbar 300 closer to the second partition 120 can be introduced into the electrical compartment 130 through the through-part 111.

[0060] The second busbar 320 may include only one type of busbar 300 of the second sub-battery compartment 142. For example, it may include only the positive busbar or only the negative busbar. The other type of busbar 300 of the second sub-battery compartment 142 is not introduced into the electrical compartment 130 through the through-part 111, but needs to be introduced into the electrical compartment 130 through other holes. For example, when the two types of busbars 300 of the sub-battery compartment are far apart, it is not easy to lead them out through the same through-part 111. In this case, only the busbar 300 closer to the second partition 120 can be introduced into the electrical compartment 130 through the through-part 111. In this way, the range of S1 / S2 is 0.05~0.25. For example, S1 / S2 can be: 0.05, 0.07, 0.09, 0.11, 0.13, 0.15, 0.17, 0.19, 0.21, 0.23, 0.25, etc. Since fewer busbars are required, the insulation and sealing requirements are lower. Therefore, the sum of the cross-sectional areas of the first busbar 310 and the second busbar 320 can be larger. That is, based on the above embodiment, the lower limit of the range of values ​​for S1 / S2 can be increased, so that S1 / S2 can take values ​​in a larger range.

[0061] The first busbar 310 may also include two-polarity busbars 300 of the first sub-battery compartment 141, meaning that both-polarity busbars 300 of the first sub-battery compartment 141 are led out through the same through-hole 111. Correspondingly, the second busbar 320 may also include two-polarity busbars 300 of the second sub-battery compartment 142, meaning that both-polarity busbars 300 of the second sub-battery compartment 142 are also led out through the same through-hole 111. That is, in this embodiment, all the busbars 300 of the first sub-battery compartment 141 and the second sub-battery compartment 142 are led out through the same through-hole 111, further reducing the number of openings on the first partition 110. Thus, the range of S1 / S2 is 0.01~0.2. For example, S1 / S2 can be: 0.01, 0.03, 0.05, 0.07, 0.09, 0.11, 0.13, 0.15, 0.17, 0.19, 0.2, etc. Since there are many busbars, the requirements for insulation and sealing are high. Therefore, the sum of the cross-sectional areas of the first busbar 310 and the second busbar 320 needs to be smaller to provide more space for sealing and insulation. That is, based on the above embodiment, the upper limit of the range of S1 / S2 can be reduced, so that S1 / S2 takes values ​​within a smaller range.

[0062] like Figure 6 As 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.

[0063] The through portion 111 is located at the top of the first partition 110 (the top is the side facing the battery box cover 400), that is, the through portion 111 has a through opening that passes through the side of the first partition 110 facing the battery box cover 400, so that the top of the through portion 111 is in a through open state.

[0064] 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.

[0065] The battery box cover 400 is sealed to the first partition 110 via a cover seal 410, which also seals the opening of the through portion 111. That is, while the cover seal 410 is in contact with and sealed to the first partition 110, the opening of the through portion 111 is also sealed. In this embodiment, placing the through portion 111 at the top of the first partition 110 facilitates its opening, and the cover seal 410 on the battery box cover 400 can seal the opening at the top of the through portion 111.

[0066] 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.

[0067] Furthermore, the second partition 120 extends at least partially into the area where the through portion 111 is located. Specifically, the top of the second partition 120 may extend to the top of the first partition 110, allowing the second partition 120 to penetrate the through portion 111; the top of the second partition 120 may also be located below the top of the first partition 110, so that the second partition 120 does not completely penetrate the through portion 111.

[0068] The second partition 120 divides the through section 111 into two sub-through sections. The first busbar 310 and the second busbar 320 are introduced into the electrical compartment 130 through different sub-through sections. That is, the first busbar 310 and the second busbar 320 are located on both sides of the second partition 120. When the first busbar 310 is located on the left side of the second partition 120, the second busbar 320 is located on the right side of the second partition 120.

[0069] In this embodiment, at least a portion of the structure of the second partition 120 is extended to the region where the through portion 111 is located, such that a portion of the structure of the second partition 120 overlaps with the area covered by the through portion 111. The second partition 120 can increase the strength of the region where the through portion 111 is located, reducing the impact of the strength decrease of the first partition 110 caused by the through portion 111. This avoids the first busbar 310 vibrating excessively on the second partition 120 due to insufficient strength in the region where the through portion 111 is located, thus preventing adverse effects on the sealing effect. By extending at least a portion of the structure of the second partition 120 to the region where the through portion 111 is located, the sealing performance at the through portion 111 can be improved by increasing the strength of the through portion 111.

[0070] Furthermore, the distance between the first busbar 310 and / or the second busbar 320 and the second partition 120 ranges from 4mm to 60mm. For example, the above distance can be 4mm, 8mm, 12mm, 16mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, etc.

[0071] The distances between the first busbar 310 and the second busbar 320 and the second partition 120 can be designed to be equal, that is, the first busbar 310 and the second busbar 320 are arranged symmetrically along the second partition 120; the distances between the first busbar 310 and the second busbar 320 and the second partition 120 can be designed to be unequal, as long as they are within 4mm to 60mm.

[0072] In this embodiment, the distance between the first busbar 310 and the second busbar 320 and the second partition 120 is controlled within the range of 4mm to 60mm. This avoids the vibration of the second partition 120 being transmitted to the first busbar 310 and the second busbar 320 due to the distance being too close, causing vibration of the first busbar 310 and the second busbar 320 and leading to seal failure. Controlling the distance between the first busbar 310 and the second busbar 320 and the second partition 120 within the range of 4mm to 60mm also avoids the problem of poor flow performance caused by the first busbar 310 and the second busbar 320 having too small a cross-sectional area due to the distance being too far from the second partition 120, even with a fixed cross-sectional area of ​​the through portion 111.

[0073] In one specific embodiment of this application, the distance between the first busbar 310 and / or the second busbar 320 and the battery box cover 400 is 5mm to 80mm. For example, the above distance can be 5mm, 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, etc.

[0074] In this embodiment, controlling the distance to within the range of 5mm to 80mm can avoid the problem of the first busbar 310 and / or 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 first busbar 310 and / or the second busbar 320 and the battery box cover 400 is too small. It can also avoid the problem of poor current flow performance caused by the cross-sectional area of ​​the first busbar 310 and / or the second busbar 320 being too small due to the distance between the first busbar 310 and the battery box cover 400 being too large when the cross-sectional area of ​​the through portion 111 is constant. 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 / or the second busbar 320 and the side of the through portion 111 away from the battery box cover 400 is too small. It can also avoid the problem of the first busbar 310 and / or the second busbar 320 having a small cross-sectional area and poor current flow performance due to the distance between the first busbar 310 and / or the second busbar 320 and the side of the through portion 111 away from the battery box cover 400 being too large when the cross-sectional area of ​​the through portion 111 is constant.

[0075] In one specific embodiment of this application, the distance between the first busbar 310 and / or the second busbar 320 and the bottom of the first partition 110 is 10mm to 80mm. For example, the above distance can be 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, etc.

[0076] In this embodiment, the distance is controlled within the range of 10mm to 80mm. This can avoid the problem that the bottom strength of the first partition 110 is poor due to the distance being too small, which makes it easy to deform during vibration or collision, thus causing the sealing failure at the through part. It can also avoid the problem that the distance between the manifold and the bottom plate is too high due to the distance being too large, which makes it easy to shake during vibration and affect the sealing effect of the through part.

[0077] In a specific embodiment of this application, both the first busbar 310 and the second busbar 320 are sealed to the first partition 110 by a partition seal 112. The partition seal 112 is disposed in the through portion 111 to fill the gap between the first busbar 310 and the second busbar 320 in the through portion 111, thereby sealing the through portion 111.

[0078] The thickness ratio of the partition seal 112 to the cover seal 410 is 1:3 to 1:1. Exemplary thickness ratios can be 1:3, 1:2.5, 1:2, 1:1.5, 1:1, etc. This embodiment does not limit the specific thickness ratio.

[0079] In this embodiment, the thickness of the partition seal 112 is 1.5mm to 4.5mm. For example, the thickness of the partition seal 112 can be 1.5mm, 2.0mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm, etc.

[0080] In this embodiment, the thickness of the lid seal 410 can be 2mm to 7mm. For example, the thickness of the lid seal 410 can be 2.0mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm, 5.0mm, 5.5mm, 6.0mm, 6.5mm, 7.0mm, etc. Those skilled in the art can select the actual thickness of the partition seal 112 and the lid seal 410 based on design requirements.

[0081] 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.

[0082] like Figure 7 As 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 side of the partition, and the side opposite to the first side of the partition is the second side of the partition. When the battery box is placed horizontally and the battery box cover 400 is on the upper side, the first side of the partition is the top of the first partition 110, and the second side of the partition is the bottom of the first partition 110.

[0083] Correspondingly, the side of the through portion 111 facing the battery box cover 400 is the first side of the through portion, and the side opposite to the first side of the through portion is the second side of the through portion. When the battery box is placed horizontally and the battery box cover 400 is on top, the first side of the through portion is the top of the through portion 111, and the second side of the through portion is the bottom of the through portion 111. The distance between the first side of the through portion and the first side of the partition is a mm, and the distance between the second side of the through portion and the second side of the partition is b mm, where a / b is 0.1 to 5. For example, a / b can be 0.1, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5, etc.

[0084] In this embodiment, selecting a / b within the range of 0.1 to 5 avoids the problem that if the distance between the first side of the through portion and the first side of the partition is too small, the top of the first partition 110 in the area where the through portion 111 is opened will have poor strength, making it easy to break during vibration and affecting the sealing effect. It also avoids the problem that if the distance between the first side of the through portion and the first side of the partition is too large when determining the position of the second side of the through portion, the through portion 111 will be too small, resulting in a smaller cross-sectional area of ​​the first busbar 310 and the second busbar 320, which will affect the flow.

[0085] In addition, by selecting a / b within the range of 0.1 to 5 in this embodiment, the problem of the first partition 110 having poor bottom strength in the area where the through-part 111 is opened due to the distance between the second side of the through-part and the second side of the partition being too small, which makes it easy to break during vibration and affect the sealing effect, can also be avoided. Furthermore, the problem of the through-part 111 being too small due to the distance between the second side of the through-part and the second side of the partition being too large when the position of the first side of the through-part is determined, which would result in a smaller cross-sectional area of ​​the first busbar 310 and the second busbar 320, thus affecting the flow rate, can also be avoided.

[0086] In this embodiment, amm is 3mm to 70mm. For example, amm can be 3mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, etc.

[0087] bmm can be 5mm to 80mm. For example, bmm can be 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, etc.

[0088] It should be noted that in a specific embodiment of this application, amm > bmm, that is, a / b is greater than 1, meaning the through portion is positioned slightly lower to reduce the influence of hot air. Furthermore, a cover seal 410 is provided on the side of the battery box cover 400 facing the box body 100. The battery box cover 400 is sealed to the first partition 110 via the cover seal 410. Both the first busbar 310 and the second busbar 320 are sealed to the first partition 110 via the partition seal 112.

[0089] The distance between the separator seal 112 and the second side of the separator is less than the distance between the cover seal 410 and the first side of the separator. Those skilled in the art will understand that the further away from the bottom plate of the battery box, the more prone it is to vibration. Therefore, in this embodiment, reducing the height of the through section 111 can reduce vibration in the area where the first busbar 310 and the second busbar 320 are located, thereby improving the sealing effect of the through section 111 and preventing sealing failure.

[0090] In one specific embodiment of this application, the distance between the partition seal 112 and the lid seal 410 can be in the range of 30mm to 70mm. For example, the distance can be 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, etc. The specific distance between the partition seal 112 and the lid seal 410 is not limited to the specific values ​​listed above; those skilled in the art can select a distance within the range of 30mm to 70mm based on actual needs.

[0091] like Figure 11 As shown in a specific embodiment of this application, the first partition 110 may be a hollow profile structure, that is, it includes a hollow partition body and at least one partition rib 115 disposed in the partition body, the partition rib 115 dividing the hollow structure of the partition body into at least two cavities 114.

[0092] Each cavity 114 is arranged along the direction from the first side of the partition to the second side of the partition. The distance between the partition rib 115 closest to the first side of the partition and the first manifold 310 and / or the second manifold 320 is 3mm to 20mm. For example, the above distance can be 3mm, 6mm, 9mm, 12mm, 14mm, 16mm, 18mm, 20mm, etc.

[0093] It should be noted that the distances between the first busbar 310 and the second busbar 320 and the partition rib 115 can be the same or different, as long as the distance is within the range of 3mm to 20mm. It should also be noted that the first partition 110 can be a solid plate structure; this embodiment does not limit the structure of the first partition 110.

[0094] In this embodiment, the distance between the first busbar 310 and / or the second busbar 320 and the partition rib 115 is selected within the range of 3mm to 20mm. This avoids the problem that if the distance is too large, the partition rib 115 will not provide adequate reinforcement at the through-hole, causing the first partition 110 to vibrate when the first busbar 310 and the second busbar 320 vibrate, thus adversely affecting the sealing effect and reducing the sealing performance. It also avoids the problem that if the distance is too small, it will lead to difficulties in opening the hole and a decrease in strength.

[0095] In addition, the first partition 110 can also be a solid plate structure, as long as a through part 111 is opened on the plate.

[0096] In one specific embodiment of this application, the distance between the first busbar 310 and the second busbar 320 is 5mm to 30mm. For example, the distance between the first busbar 310 and the second busbar 320 can be 5mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 24mm, 26mm, 28mm, 30mm, etc.

[0097] This configuration avoids the problem that if the distance between the first busbar 310 and the second busbar 320 is too small, the first busbar 310 and the second busbar 320 will have a significant impact on the sealing structure during vibration, thus affecting the sealing effect. It also avoids the problem that if the distance between the first busbar 310 and the second busbar 320 is too large when the cross-sectional area of ​​the through portion 111 is constant, the cross-sectional areas of the first busbar 310 and the second busbar 320 will be too small, resulting in poor flow capacity.

[0098] The minimum distance between the first busbar 310 and the edge of the through portion 111 is 3mm to 15mm; for example, the minimum distance between the first busbar 310 and the edge of the through portion 111 is 3mm, 5mm, 8mm, 10mm, 12mm, 15mm, etc.

[0099] The minimum distance between the second busbar 320 and the edge of the through portion 111 is 3mm to 15mm. For example, the minimum distance between the second busbar 320 and the edge of the through portion 111 is 3mm, 5mm, 8mm, 10mm, 12mm, 15mm, etc.

[0100] In this embodiment, the minimum distance between the first busbar 310 and the second busbar 320 and the edge of the through portion 111 is controlled at 3mm to 15mm. This avoids the problem that the sealing thickness is too thin due to the distance being too small, which would make sealing difficult and affect the sealing effect. It also avoids the problem that the cross-sectional area of ​​the first busbar 310 and the second busbar 320 is too small due to the distance being too large when the cross-sectional area of ​​the through portion 111 is fixed, which would result in poor flow capacity.

[0101] like Figure 8 and Figure 9As shown, the battery housing may further include a baffle 113 disposed within the through portion 111. The baffle 113 is located on at least one large surface of the first partition 110, and is sealed to the first partition 110 by a partition seal. The baffle 113 can be welded to seal the through portion 111. Specifically, the outer edge of the baffle 113 can be welded to the inner wall edge of at least one large surface of the through portion 111.

[0102] The first busbar 310 and the second busbar 320 are introduced into the electrical compartment 130 through the baffle 113 and are sealed to the baffle 113. In this embodiment, by welding the baffle 113 into the through portion 111, the strength of the area around the through portion 111 can be improved, and the sealing performance at the through portion 111 can also be improved by achieving a seal through welding.

[0103] The ratio of the area of ​​the through portion 111 to the large surface area of ​​the first partition 110 is 0.01 to 0.18. For example, the ratio of the area of ​​the through portion 111 to the large surface area of ​​the first partition 110 is 0.01, 0.03, 0.05, 0.07, 0.09, 0.11, 0.03, 0.15, 0.17, 0.18, etc. This arrangement avoids the problem that if the opening of the through portion 111 is too large, the sealing surface of the baffle 113 and the first partition 110 will be close to the edge of the first partition 110, affecting the sealing effect.

[0104] The baffle 113 can be disposed on the side of the first partition 110 facing the electrical compartment 130 to prevent the baffle 113 from affecting the installation of the battery.

[0105] It should be noted that the baffle 113 can be made of metal. When the first busbar 310 and the second busbar 320 pass through the baffle 113, they need to be sealed and insulated from the baffle 113 to prevent short circuits. Of course, the baffle 113 can also be made of plastic. When the baffle 113 is made of insulating plastic, it can be fixed in the through portion 111 by adhesive.

[0106] The baffle 113 is provided with a connection port for leading out the first busbar 310 and the second busbar 320 (such as the first connection port 1131 for leading out the first busbar 310 and the second connection port 1132 for leading out the second busbar 320). After the first busbar 310 and the second busbar 320 extend out through their respective connection ports, the gap between the busbar and the connection port needs to be insulated and sealed.

[0107] The spacing between the first busbar 310 and the second busbar 320 ranges from 5mm to 20mm. For example, the spacing between the first busbar 310 and the second busbar 320 can be 5mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, etc.

[0108] In this embodiment, the through portion 111 is sealed by the baffle 113. The baffle 113 can reinforce the through portion 111 of the first partition 110, thereby reducing the distance between the first busbar 310 and the second busbar 320 (when the cross-sectional area of ​​the through portion 111 is constant), thereby increasing the cross-sectional area of ​​the first busbar 310 and the second busbar 320 and improving the flow capacity.

[0109] like Figure 7 As shown, in another embodiment of this application, the through portion 111 may not have a baffle 113, but only a partition seal 112. Both the first busbar 310 and the second busbar 320 are sealed to the first partition 110 via the partition seal 112. The minimum thickness of the partition seal 112 ranges from 2mm to 5mm. For example, the minimum thickness of the partition seal 112 can be 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, etc.

[0110] When the sub-battery compartments are connected in parallel, the heat generation varies, and the risk of imbalance of the separator seal 112 is relatively large. In this embodiment, the thickness of the thinnest part of the separator seal 112 is controlled within the range of 2mm to 5mm. This can avoid the problem that the separator seal 112 is prone to sealing failure due to its thinness being too small. It can also avoid the problem that when the cross-sectional area of ​​the through part 111 is fixed, the thickness of the separator seal 112 is too large, resulting in a small cross-sectional area of ​​the first busbar 310 and the second busbar 320, which leads to poor current carrying capacity.

[0111] like Figure 12 As shown in a specific embodiment of this application, the plane containing the large surfaces of the first busbar 310 and the second busbar 320 is perpendicular to the bottom plate 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 surfaces with the largest area. 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 bottom plate of the housing body 100, which gives the first busbar 310 and the second busbar 320 greater rigidity in the height direction. This can reduce the vibration of the first busbar 310 and the second busbar 320, reduce the impact of vibration on the sealing position of the busbar and the connecting port (in the case of only setting the partition seal 112, the connecting port is the connecting port on the partition seal 112; in the case of only setting the baffle 113, the connecting port is the connecting port on the baffle 113), and improve the sealing effect.

[0112] When the plane containing the large surfaces of the first busbar 310 and the second busbar 320 is perpendicular to the bottom plate of the housing body 100, the distance between the first busbar 310 and the second busbar 320 ranges from 5mm to 25mm. For example, the distance between the first busbar 310 and the second busbar 320 can be 5mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 25mm, etc.

[0113] This configuration avoids the sealing effect caused by resonance of the first busbar 310 and the second busbar 320 during vibration due to the small distance between them. It also avoids the problem of poor flow capacity caused by the small cross-sectional area of ​​the first busbar 310 and the second busbar 320 when the distance between them is too large, even with a fixed cross-sectional area of ​​the through portion 111.

[0114] like Figure 13 As shown, in another embodiment of this application, the plane containing the large surfaces of the first busbar 310 and the second busbar 320 is parallel to the bottom plate of the housing body 100. In this embodiment, designing the plane containing the large surfaces of the first busbar 310 and the second busbar 320 to be parallel to the bottom plate of the housing body 100 can reduce the size of the through portion 111 in the height direction (the arrangement direction of the battery box cover and the housing 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 through portion 111.

[0115] When the plane containing the large surfaces of the first busbar 310 and the second busbar 320 is parallel to the bottom plate of the housing body 100, the distance between the first busbar 310 and the second busbar 320 ranges from 8mm to 30mm. For example, the distance between the first busbar 310 and the second busbar 320 can be 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 25mm, 28mm, 30mm, etc.

[0116] This configuration avoids the sealing effect caused by resonance of the first busbar 310 and the second busbar 320 during vibration due to the small distance between them. It also avoids the problem of poor flow capacity caused by the small cross-sectional area of ​​the first busbar 310 and the second busbar 320 when the distance between them is too large, even with a fixed cross-sectional area of ​​the through portion 111.

[0117] When the plane containing the large surfaces of the first busbar 310 and the second busbar 320 is parallel to the large surface of the housing body 100, the distance between the first busbar 310 and the housing cover seal 410 is 10mm to 80mm, and the distance between the second busbar 320 and the housing cover seal 410 is 10mm to 80mm. For example, the distance between the first busbar 310 and / or the second busbar 320 and the housing cover seal 410 can be 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, etc.

[0118] During thermal runaway of the battery pack, high-temperature gases tend to accumulate at the top of the battery casing, making the seals used to seal the through-hole 111 prone to failure under the influence of these gases. In this embodiment, the distance between the first busbar 310 and the casing cover seal 410 is controlled to be between 10mm and 80mm, and the distance between the second busbar 320 and the casing cover seal 410 is also controlled to be between 10mm and 80mm. This reduces the risk of the seals used to seal the through-hole 111 failing under the influence of high-temperature gases due to excessively small distances. It also avoids the problem of poor current flow capacity caused by excessively large distances when the cross-sectional area of ​​the through-hole 111 is constant, resulting in smaller cross-sectional areas of the first busbar 310 and the second busbar 320.

[0119] like Figure 14 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 bend portion 302, and the included angle between the lead-out portion 301 and the bend portion 302 is in the range of 80° to 100°. For example, the included angle between the lead-out portion 301 and the bend portion 302 can be 80°, 83°, 86°, 88°, 90°, 93°, 96°, 98°, 100°, etc.

[0120] 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.

[0121] The lead-out portion 301 is introduced into the electrical compartment 130 through the through 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.

[0122] The minimum distance hmm between the bent portion 302 and the first partition 110 is 5mm to 100mm. For example, the minimum distance hmm can be 5mm, 15mm, 25mm, 35mm, 45mm, 55mm, 65mm, 75mm, 85mm, 95mm, 100mm, etc.

[0123] 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 hmm.

[0124] 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 through portion 111 based on a certain length, thereby reducing the length of the cantilever (the part passing through the through portion 111 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.

[0125] In this embodiment, the minimum distance hmm between the bent portion 302 and the first partition 110 is controlled within the range of 5mm to 100mm. This avoids the problem that if hmm is too small, the first busbar 310 and the second busbar 320 will collide with the first partition 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 hmm 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.

[0126] The transition section can be a circular arc transition structure to reduce stress concentration. Since the transition section has a certain thickness, it must have an inner arc surface and an outer arc surface. The inner radius (r) of the transition section is 1.5mm to 5mm. For example, the inner radius of the transition section is 1.5mm, 1.8mm, 2.0mm, 2.4mm, 2.8mm, 3mm, 3.4mm, 3.8mm, 4mm, 4.4mm, 4.8mm, and 5mm.

[0127] The outer radius (r) of the transition section is 3mm to 10mm. Examples of outer radius (r) values ​​for the transition section include 3mm, 3.4mm, 3.8mm, 4mm, 4.4mm, 4.8mm, 5mm, 5.4mm, 5.8mm, 6mm, 6.4mm, 6.8mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, and 10mm. It should be noted that the outer radius (r) of the transition section is larger than the inner radius (r).

[0128] In this embodiment, the inner radius of the transition section is controlled within the range of 1.5mm to 5mm, and the outer radius is controlled within the range of 3mm to 10mm. This avoids the problem that the stress at the transition position of the lead-out portion 301 and the bending portion 302 is too concentrated due to the radius of the transition section being too small, which could easily cause the busbar to break at the transition position of the lead-out portion 301 and the bending portion 302 during vibration. It also avoids the problem that the flow path is too long due to the radius of the transition section being too large, resulting in poor flow capacity.

[0129] 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.

[0130] 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.

[0131] 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.

[0132] 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.

[0133] 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). At least two of the sub-battery compartments (140) are separated from the electrical compartment (130) by the first partition (110). The first partition (110) is provided with a through portion (111), and at least one adjacent sub-battery compartment (140) is connected to the electrical compartment (130) through the same through portion (111). The two sub-battery compartments (140) connected to the electrical compartment (130) through the same through-part (111) are the first sub-battery compartment (141) and the second sub-battery compartment (142). The first busbar (310) of the first sub-battery compartment (141) is introduced into the electrical compartment (130) through the through-part (111), and the second busbar (320) of the second sub-battery compartment (142) is introduced into the electrical compartment (130) through the through-part (111). The first busbar (310) and the second busbar (320) are sealed to the first partition (110) at the through-part (111).

2. The battery pack as described in claim 1, characterized in that, Both the first busbar (310) and the second busbar (320) are sealed to the first partition (110) through a partition seal (112); On the large surface of the first partition (110), the sum of the cross-sectional areas of the first busbar (310) and the second busbar (320) is S1mm. 2 The cross-sectional area of ​​the partition seal (112) is S2mm. 2 The range of S1 / S2 is 0.01~0.

25.

3. The battery pack as described in claim 2, characterized in that, The sum of the cross-sectional areas of the first busbar (310) and the second busbar (320) is S1mm. 2 40mm 2 ~800mm 2 ; And / or, The cross-sectional area of ​​the partition seal (112) is S2mm. 2 3000mm 2 ~8000mm 2 .

4. The battery pack as described in claim 2, characterized in that, The first busbar (310) includes a busbar (300) of one polarity of the first sub-battery compartment (141); the second busbar (320) includes a busbar (300) of one polarity of the second sub-battery compartment (142). The range of S1 / S2 is 0.05~0.

25.

5. The battery pack as described in claim 1, characterized in that, The first busbar (310) includes two polarity busbars (300) of the first sub-battery compartment (141); the second busbar (320) includes two polarity busbars (300) of the second sub-battery compartment (142). The range of S1 / S2 is 0.01~0.

2.

6. 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 through portion (111) has a through 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), and the through opening of the through part (111) is sealed by the box cover seal (410).

7. The battery pack as described in claim 6, characterized in that, The second partition (120) extends at least partially into the area where the through section (111) is located and divides the through section (111) into two sub-through sections, through which the first busbar (310) and the second busbar (320) are introduced into the electrical compartment (130) respectively.

8. The battery pack as described in claim 7, characterized in that, The distance between the first busbar (310) and / or the second busbar (320) and the second partition (120) ranges from 4mm to 60mm.

9. The battery pack as described in claim 6, characterized in that, The distance between the first busbar (310) and / or the second busbar (320) and the battery box cover (400) is 5mm to 80mm.

10. The battery pack as claimed in claim 6, characterized in that, The distance between the first busbar (310) and / or the second busbar (320) and the bottom of the first partition (110) is 10mm to 80mm.

11. The battery pack as claimed in claim 6, characterized in that, The first manifold (310) and the second manifold (320) are sealed to the first partition (110) by a partition seal (112), and the thickness ratio of the partition seal (112) to the cover seal (410) is 1:3 to 1:

1.

12. The battery pack as claimed in claim 11, 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.

13. The battery pack as claimed 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 through portion (111) facing the battery box cover (400) is the first side of the through portion, and the side opposite to the first side of the through portion is the second side of the through portion. The distance between the first side of the through portion and the first side of the partition is a mm, and the distance between the second side of the through portion and the second side of the partition is b mm, where a / b is 0.1~5.

14. The battery pack as claimed in claim 13, characterized in that, amm is 3mm to 70mm; and / or bmm is 5mm to 80mm.

15. The battery pack as claimed in claim 13, characterized in that, amm > bmm.

16. The battery pack as claimed in claim 13, characterized in that, The battery box cover (400) is provided with a 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 cover seal (410). The first busbar (310) and the second busbar (320) are sealed to the first partition (110) through the partition seal (112). The distance between the partition seal (112) and the second side of the partition is less than the distance between the box cover seal (410) and the first side of the partition.

17. The battery pack as claimed in claim 16, characterized in that, The distance between the partition seal (112) and the box cover seal (410) is 30mm to 70mm.

18. The battery pack as claimed in claim 1, characterized in that, The battery box includes a battery box cover (400) mounted on the box body (100), and 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 first partition (110) includes a hollow partition body and at least one partition rib (115) disposed in the partition body, the partition rib (115) dividing the hollow structure of the partition body into at least two cavities; Each of the cavities is arranged along the direction from the first side of the partition to the second side of the partition, and the distance between the partition rib (115) closest to the first side of the partition and the first busbar (310) and / or the second busbar (320) is 3mm to 20mm.

19. The battery pack as claimed in claim 1, characterized in that, The distance between the first busbar (310) and the second busbar (320) is 5mm to 30mm.

20. The battery pack as claimed in claim 1, characterized in that, The minimum distance between the first busbar (310) and the edge of the through portion (111) is 3mm to 15mm; And / or, The minimum distance between the second busbar (320) and the edge of the through portion (111) is 3mm to 15mm.

21. The battery pack as claimed in claim 1, characterized in that, It also includes a baffle (113) disposed on the through portion (111), the baffle (113) being located on at least one large surface of the first partition (110) and being sealed to the first partition (110) by a partition sealer, and the first busbar (310) and the second busbar (320) being introduced into the electrical compartment (130) through the baffle (113) and being sealed to the baffle (113), and the ratio of the area of ​​the through portion (111) to the large surface area of ​​the first partition (110) is 0.01 to 0.

18.

22. The battery pack as claimed in claim 21, characterized in that, The baffle (113) is disposed on the side of the first partition (110) facing the electrical compartment (130).

23. The battery pack as claimed in claim 21, characterized in that, The baffle (113) is provided with a communication port for leading out the first busbar (310) and the second busbar (320), and the distance between the first busbar (310) and the second busbar (320) is in the range of 5mm to 20mm.

24. The battery pack as claimed in claim 1, characterized in that, A partition seal (112) is provided inside the through part (111). The first busbar (310) and the second busbar (320) are both sealed to the first partition (110) through the partition seal (112). The minimum thickness of the partition seal (112) is 2mm to 5mm.

25. The battery pack according to any one of claims 1-24, characterized in that, The housing body (100) includes a base plate for supporting the battery and electrical components; The plane containing the large surfaces of the first busbar (310) and the second busbar (320) is perpendicular to the base plate, and the distance between the first busbar (310) and the second busbar (320) is in the range of 5mm to 25mm.

26. The battery pack according to any one of claims 1-24, characterized in that, The housing body (100) includes a base plate for supporting the battery and electrical components; The plane containing the large surfaces of the first busbar (310) and the second busbar (320) is parallel to the bottom plate of the box body (100), and the distance between the first busbar (310) and the second busbar (320) is 8mm to 30mm.

27. The battery pack as claimed in claim 26, characterized in that, The battery box includes a battery box cover (400) installed on the box body (100), and the battery box cover (400) is sealed to the first partition (110) through a box cover seal (410); The distance between the first manifold (310) and the cover seal (410) is 10mm to 80mm, and / or the distance between the second manifold (320) and the cover seal (410) is 10mm to 80mm.

28. The battery pack according to any one of claims 1-24, 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), wherein the included angle between the lead-out portion (301) and the bend portion (302) is in the range of 80° to 100°; The lead-out part (301) is introduced into the electrical compartment (130) through the through part (111), the bending part (302) is located in the sub-battery compartment (140), and the minimum distance hmm between the bending part (302) and the first partition (110) is 5mm~100mm.

29. The battery pack according to any one of claims 1-24, 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), wherein the lead-out portion (301) and the bend portion (302) are smoothly transitioned by a transition portion; The lead-out part (301) is introduced into the electrical compartment (130) through the through part (111), the bending part (302) is located in the sub-battery compartment (140), the transition part is an arc transition structure, and the inner r angle of the transition part is 1.5mm ~ 5mm, and the outer r angle is 3mm ~ 10mm.

30. The battery pack according to any one of claims 1-24, characterized in that, The first busbar (310) and the second busbar (320) can be connected in series or in parallel within the electrical compartment (130).

31. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1-30.

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