Single battery and battery pack

Abstract

The invention discloses a single battery and a battery pack, and belongs to the technical field of power batteries, the single battery comprises a battery body, a first shell and a first hollow part, the battery body has a first direction, a second direction and a third direction which are intersected with one another, and the first shell covers the battery body; the first hollow part penetrates through the battery body and the first shell along a first direction and is connected with the first shell; the first hollow part comprises two first connecting plates and two second connecting plates; the two first connecting plates and the two second connecting plates in the first hollow part are connected end to end at intervals to form a frame-shaped structure, and the frame-shaped structure penetrates through the battery body and the first shell and is connected with the first shell to form a concentric-square-shaped structure for accommodating the battery body. The rectangular-ambulatory-plane structure is matched with the cooling plate, so that the two first connecting plates can be cooled by the single cooling plate, the heat dissipation area of the single battery is increased, and the cooling effect is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of power batteries, and specifically relates to a single cell and a battery pack. Background Art

[0002] With the rise of new energy vehicles, factors such as the energy density of the battery pack and the electric vehicle platform determine different battery pack designs. As the industrialization of the power electricity industry accelerates, the volume, grouping efficiency and safety design of the battery pack has become a hot topic of current research, resulting in more blade battery pack design schemes.

[0003] Existing blade battery packs are mostly cooled at the top or bottom of the blade battery pack, that is, a cooling plate performs single-sided cooling on the blade battery pack, the cooling efficiency is low, and the existing blade batteries cannot achieve thermal and electrical separation. Summary of the invention

[0004] An embodiment of the present application provides a single cell battery, aiming to increase the heat dissipation area and improve the cooling efficiency of the cooling plate in the battery pack; another object of the embodiment of the present application is to provide an electrical device; another object of the embodiment of the present application is to provide a car.

[0005] The present invention provides a single battery, including:

[0006] A battery body having a first direction, a second direction, and a third direction intersecting each other;

[0007] A first shell, covering the outside of the battery body;

[0008] The first hollow portion penetrates the battery body and the first shell along the first direction and is connected to the first shell; the first hollow portion includes two first connecting plates and two second connecting plates, the two first connecting plates are arranged opposite to each other along the second direction and are connected to the first shell; the two second connecting plates are arranged opposite to each other along the third direction and are connected to the first shell, and each of the second connecting plates is connected to the two first connecting plates.

[0009] In some embodiments, the single battery includes a first explosion-proof valve, and the first explosion-proof valve is disposed on at least one of the second connecting plates.

[0010] A battery pack provided in an embodiment of the present application includes:

[0011] A box body, the box body comprising a second shell and a bottom plate, the second shell is connected to the bottom plate, and the second shell is arranged around the bottom plate to form a receiving cavity;

[0012] A plurality of the above-mentioned single cells, wherein the plurality of the single cells are sequentially stacked in the accommodating cavity along the first direction and connected to the second housing;

[0013] A cooling plate passes through the first hollow parts of all the single cells and is connected to the second shell.

[0014] In some embodiments, the second housing comprises:

[0015] A first side beam, arranged around the outer portion of the bottom plate to form a notch, the notch being communicated with the accommodating cavity;

[0016] a second side beam, covering the notch, and the second side beam is connected to the first side beam;

[0017] The second shell has a second hollow portion, the second hollow portion passes through the second side beam along the first direction, the second hollow portion is aligned with and connected to all the first hollow portions, and the cooling plate passes through the second hollow portion and all the first hollow portions in sequence.

[0018] In some embodiments, the second shell further includes a third side beam, which is disposed on a side of the single cell away from the second side beam and presses the single cell to contact the second side beam, and the third side beam is connected to the first side beam.

[0019] In some embodiments, the second shell also has a third hollow portion, which passes through the third side beam along the first direction, and the third hollow portion, the second hollow portion, and all the first hollow portions are aligned with each other and connected, and the cooling plate passes through the second hollow portion, all the first hollow portions, and the third hollow portion in sequence, and the cooling plate partially passes through the third hollow portion.

[0020] In some embodiments, the cooling plate includes a cooling plate body, wherein the cooling plate body is penetrated by the first hollow portion and connected to the second shell;

[0021] The cooling plate also has a flow channel and a through hole. The flow channel penetrates the cooling plate body along the length direction of the cooling plate body. The flow channel is connected to the through hole. The through hole is opened on the side wall of the cooling plate body in the thickness direction, and the opening position of the through hole corresponds to the setting position of the first explosion-proof valve.

[0022] In some embodiments, the battery pack further comprises:

[0023] A first thermally conductive silicone pad is disposed on a side of the cooling plate away from the bottom plate and connected to the cooling plate, and a side of the first thermally conductive silicone pad away from the cooling plate is in contact with a first connecting plate of the first hollow portion;

[0024] The second thermally conductive silicone pad is arranged on a side of the cooling plate facing the bottom plate and connected to the cooling plate, and the side of the second thermally conductive silicone pad facing away from the cooling plate is in contact with another first connecting plate of the first hollow portion.

[0025] In some embodiments, the length of the first hollow portion in the third direction of the single battery is L 1 The length L of the single battery in the third direction 2 , meet 1 / 2L 2 ≤L 1 ≤L 2 .

[0026] In some embodiments, the height of the first hollow portion in the second direction of the single battery is H. 1 The height of the single battery in the second direction is H 2 , meet 1 / 15H 2 ≤H 1 ≤1 / 10H 2 .

[0027] The various embodiments of the present application have the following beneficial effects:

[0028] A single cell according to an embodiment of the present application comprises a battery body, a first shell and a first hollow portion, the battery body has a first direction, a second direction and a third direction intersecting each other, the first shell cover is arranged outside the battery body, the first hollow portion penetrates the battery body and the first shell along the first direction and is connected to the first shell; the first hollow portion comprises two first connecting plates and two second connecting plates, the two first connecting plates are arranged oppositely along the second direction and are connected to the first shell; the two second connecting plates are arranged oppositely along the third direction and are connected to the first shell, and each second connecting plate is connected to the two first connecting plates; the two first connecting plates and the two second connecting plates in the first hollow portion of the present application are connected end to end to form a frame structure, the frame structure penetrates the battery body and the first shell, and is connected to the first shell to form a U-shaped structure for accommodating the battery body. Compared with the existing single cell, multiple heat dissipation surfaces are added, the heat dissipation efficiency of the single cell is improved, and it can cooperate with the cooling plate to further improve the cooling efficiency.

[0029] A battery pack according to an embodiment of the present application includes a case, a plurality of single cells and a cooling plate. The case includes a second shell and a bottom plate, the second shell is connected to the bottom plate, and the second shell is arranged around the bottom plate circumference to form a receiving cavity. A plurality of single cells are stacked in sequence in the receiving cavity along the length direction of the bottom plate and connected to the second shell, so that the case can protect the single cells and prevent the single cells from being affected by external factors such as impact, vibration, and temperature change. The single cell includes a battery body, the battery body is connected to the second shell, the single cell has a first hollow portion, and the first hollow portion passes through the battery body along the length direction of the bottom plate. The first hollow portions on each single cell are aligned with each other and connected to each other so that the cooling plate can pass through. The cooling plate passes through all the first hollow portions and is connected to the second shell. Compared with the existing single cooling plate that can only achieve single-sided cooling of the battery module, the first hollow portion in this embodiment is combined with the cooling plate to achieve double-sided cooling of the single battery by the cooling plate, which improves the cooling efficiency of the single battery, and the same cooling plate can cool multiple single batteries at the same time, saving the space occupied by the cooling plate in the battery pack and the manufacturing cost, and improving the cooling efficiency of the battery pack. By passing the cooling plate through all the first hollow portions and connecting with the second shell, the contact between the cooling plate and the single battery can be made closer, and the heat conduction efficiency can be improved. In this way, the heat generated by the single battery can be effectively and quickly transferred to the cooling plate, and the heat is dissipated through the cooling plate, thereby reducing the temperature of the single battery. In addition, the design of the first hollow portion allows the single battery to dissipate heat from the middle to the four peripheral surfaces, which is more efficient than traditional cooling. It can not only solve the problem of fast charging heat dissipation, but also improve the thermal management performance and cycle life of the battery pack, and reduce costs.

[0030] The electric device of the embodiment of the present application includes the battery pack as described in the above embodiment, and thus can have all the technical features and technical effects of the above battery pack, which will not be described in detail here.

[0031] The automobile of the embodiment of the present application includes the battery pack or the electric device as described in the above embodiment, and thus can have all the technical features and technical effects of the above battery pack or electric device, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0033] Figure 1 A schematic diagram of the overall structure of a single cell provided in an embodiment of the present application;

[0034] Figure 2 An exploded view of the overall structure of a battery pack provided in an embodiment of the present application;

[0035] Figure 3 A schematic diagram of the overall structure of a single cell provided in an embodiment of the present application;

[0036] Figure 4 A schematic diagram of the overall structure of a cooling plate provided in an embodiment of the present application;

[0037] Figure 5 Provided in the embodiments of this application Figure 4 Sectional structure diagram at AA in the middle;

[0038] Figure 6 A schematic diagram of the overall structure of another battery pack provided in an embodiment of the present application;

[0039] Figure 7 An exploded view of the overall structure of another battery pack provided in an embodiment of the present application;

[0040] Figure 8 A schematic diagram of the overall structure of another single cell provided in an embodiment of the present application;

[0041] Fig. 9 A schematic diagram of the structure of a battery module in another battery pack provided in an embodiment of the present application;

[0042] Fig.10 A schematic diagram of the structure of the first hollow portion provided in an embodiment of the present application;

[0043] Fig.11 A schematic cross-sectional structure diagram of another single cell provided in an embodiment of the present application;

[0044] Reference numerals:

[0045] X-first direction; Y-second direction; Z-third direction;

[0046] 10-box; 11-second shell; 111-first side beam; 112-notch; 113-second side beam; 114-second hollow portion; 115-third side beam; 116-third hollow portion; 12-bottom plate; 13-accommodating cavity;

[0047] 20-monocell; 21-battery body; 22-first hollow portion; 221-first connecting plate; 222-second connecting plate; 23-first explosion-proof valve; 24-first shell;

[0048] 30-cooling plate; 31-cooling plate body; 32-flow channel; 33-through hole;

[0049] 40-first thermal conductive silicone pad;

[0050] 50-second thermal conductive silicone pad;

[0051] 60-1st channel;

[0052] 70-Second channel;

[0053] 80-Second explosion-proof valve. DETAILED DESCRIPTION

[0054] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0055] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here. In the description of the present application, unless otherwise specified, "multiple" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B, which can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are an "or" relationship. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0056] Those skilled in the art will appreciate that the drawings are only schematic diagrams of example embodiments and may not be to scale. The modules or processes in the drawings are not necessarily required to implement the present application and therefore cannot be used to limit the scope of protection of the present application.

[0057] With the rise of new energy vehicles, factors such as the energy density of the battery pack and the electric vehicle platform determine different battery pack designs. As the industrialization of the power electricity industry accelerates, the volume, grouping efficiency and safety design of the battery pack has become a hot topic of current research, resulting in more blade battery pack design schemes.

[0058] Most existing blade battery packs use a cooling plate installed on the top or bottom to cool only one side of the blade battery pack. This single-sided cooling method results in low cooling efficiency and fails to fully utilize cooling resources, resulting in uneven temperature distribution of the blade battery pack. The design structure of the blade battery pack limits the effectiveness of the heat dissipation path. Due to the close arrangement of the single cells inside the blade battery pack, the conduction and heat dissipation of heat inside the battery pack are limited. This makes it difficult for heat to be quickly transferred to the cooling plate, thereby reducing the cooling efficiency. Existing blade batteries cannot achieve thermoelectric separation, that is, they cannot process heat and current separately. During the charging and discharging process, the battery generates a lot of heat, and the existing cooling method cannot effectively separate the heat from the current, resulting in low cooling efficiency.

[0059] In view of this, the embodiments of the present application provide a single cell and a battery pack, aiming to solve at least part of the above-mentioned technical problems.

[0060] See also Figures 1 to 11 , the present application embodiment provides a single battery, please refer to Figure 1 and Fig.11 , Figure 1 This is a schematic diagram of the overall structure of a single cell provided in an embodiment of the present application. Fig.11 A schematic cross-sectional structure diagram of another single cell provided in an embodiment of the present application. The single cell includes a battery body 21, a first shell 24 and a first hollow portion 22, the battery body 21 has a first direction X, a second direction Y and a third direction Z intersecting each other, the first shell 24 is covered outside the battery body 21, the first hollow portion 22 penetrates the battery body 21 and the first shell 24 along the first direction X, and is connected to the first shell 24; the first hollow portion 22 includes two first connecting plates 221 and two second connecting plates 222, the two first connecting plates 221 are arranged opposite to each other along the second direction Y, and are connected to the first shell 24; the two second connecting plates 222 are arranged opposite to each other along the third direction Z, and are connected to the first shell 24, and each second connecting plate 222 is connected to two first connecting plates 221.

[0061] It should be noted that in the drawings of the embodiments of the present application, the arrow marked with X represents the first direction X, the arrow marked with Y represents the second direction Y, and the arrow marked with Z represents the third direction Z. The description of the present application introduces the first direction X, the second direction Y and the third direction Z in order to more clearly describe the structure and relative position relationship of each component in the single cell. In practical applications, the first direction X, the second direction Y and the third direction Z can point to any orientation in space. In some embodiments, in the single cell, the first direction X corresponds to the thickness direction of the single cell, the second direction Y and the third direction Z intersect, and the second direction Y is the height direction of the single cell, and the third direction Z is the length direction of the single cell. Optionally, the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0062] In view of this, the two first connecting plates 221 and the two second connecting plates 222 in the first hollow portion 22 of the present embodiment are connected end to end to form a frame structure, and the frame structure penetrates the battery body 21 and the first shell 24, and is connected to the first shell 24 to form a U-shaped structure for accommodating the battery body 21. Through the cooperation of the U-shaped structure and the cooling plate, a single cooling plate can cool the two first connecting plates 221, thereby increasing the heat dissipation area of ​​the single battery 20 and improving the cooling effect.

[0063] In some embodiments, please participate Figure 3 and Fig.10 , Figure 3 This is a schematic diagram of the overall structure of a single cell provided in an embodiment of the present application. Fig.10 The above-mentioned single battery 20 includes a first explosion-proof valve 23 , and the first explosion-proof valve 23 is arranged on at least one of the second connecting plates 222 .

[0064] It should be noted that the first explosion-proof valve 23 is a safety device used to prevent overvoltage and overcharging of the battery during charging or use. When the internal pressure of the battery exceeds the safety range, the first explosion-proof valve 23 will automatically open to release the internal pressure to avoid battery explosion or damage. The first hollow portion 22 has two first connecting plates 221 and two second connecting plates 222. At least one of the two opposite second connecting plates 222 is provided with a first explosion-proof valve 23. When the first explosion-proof valve 23 is provided on only one second connecting plate 222, a plurality of single cells 20 are stacked to form a battery module, and the first explosion-proof valve 23 on each single cell 20 in the battery module is arranged in the same position, that is, the first explosion-proof valve 23 is arranged in a single row in the battery module. This unified setting position can simplify the manufacturing process and maintenance operations, and improve production efficiency and maintenance convenience. When the first explosion-proof valve 23 is provided on both second connecting plates 222, a plurality of single cells 20 are stacked to form a battery module, and the first explosion-proof valve 23 on each single cell 20 in the battery module is provided at the same position, that is, the first explosion-proof valve 23 is provided in two rows in the battery module. This unified setting position can simplify the manufacturing process and maintenance operations, improve production efficiency and maintenance convenience, and more first explosion-proof valves 23 can improve the thermal runaway pressure relief capability compared to the first explosion-proof valves 23 provided in a single row.

[0065] See also Figure 2 and Figure 3 , Figure 2 An exploded view of the overall structure of a battery pack provided in an embodiment of the present application, Figure 3 A schematic diagram of the overall structure of a single cell provided in an embodiment of the present application. The battery pack includes a case 10, a plurality of single cells 20 and a cooling plate 30. The single cell 20 is the single cell described in the above embodiment. The case 10 includes a second shell 11 and a bottom plate 12, the second shell 11 is connected to the bottom plate 12, and the second shell 11 is arranged around the bottom plate 12 to form a receiving cavity 13. A plurality of single cells 20 are stacked in sequence in the receiving cavity 13 along a first direction X and connected to the second shell 11, so that the case 10 can protect the single cells 20 and prevent the single cells 20 from being affected by external impact, vibration, temperature change and other factors. The first hollow portions 22 on each single cell 20 are aligned and connected to each other so that the cooling plate 30 can be passed through. The cooling plate 30 passes through all the first hollow portions 22 and is connected to the second shell 11.

[0066] It should be noted that the battery pack of this embodiment is a blade battery pack. The single cells in the blade battery pack are designed to be in the shape of a long and thin blade. This design makes the most of the space between the single cells, thereby improving the energy density and power density of the battery pack. The blade battery pack adopts a compact structure, which allows the single cells to be arranged more closely together. This can reduce the overall volume of the battery pack, improve the energy storage efficiency of the battery pack, and better adapt to the needs of different vehicles and application scenarios. The single cells in the blade battery pack adopt an interference fit connection method, which makes the current distribution between the single cells more uniform and reduces the resistance and voltage drop between the single cells. This can improve the overall performance and reliability of the battery pack.

[0067] In view of this, compared with the existing single cooling plate that can only achieve single-sided cooling of the battery module, the first hollow portion 22 in this embodiment is combined with the cooling plate 30, so that the single cooling plate 30 can achieve double-sided cooling. In this way, the cooling area can be increased, the heat dissipation efficiency and thermal management performance can be improved, thereby improving the cooling efficiency of the entire battery pack. By penetrating all the first hollow portions 22 of the cooling plate 30 and connecting with the second shell 11, the contact between the cooling plate 30 and the single battery 20 can be made closer, thereby improving the heat conduction efficiency. In this way, the heat generated by the single battery 20 can be effectively transferred to the cooling plate 30 quickly, and the heat is dissipated through the cooling plate 30, thereby reducing the temperature of the single battery 20. In addition, with the design of the first hollow portion 22, the single battery 20 dissipates heat from the middle to the four peripheral surfaces respectively, which is more efficient than traditional cooling, can solve the problem of fast charging heat dissipation, and at the same time improve the thermal management performance and cycle life of the battery pack, and reduce the cost. The design of the box 10 can protect multiple single batteries 20 from external impact, vibration, temperature changes and other factors. The connection structure between the second housing 11 and the bottom plate 12 and the arrangement of the accommodating cavity 13 can provide a stable protective environment and ensure the safe operation of the single battery 20 .

[0068] In some embodiments, Figure 2 As shown, the second shell 11 includes a first side beam 111 and a second side beam 113. The first side beam 111 is arranged around the outer portion of the bottom plate 12 to form a notch 112, and the notch 112 is connected to the accommodating cavity 13; the second side beam 113 covers the notch 112, and the second side beam 113 is connected to the first side beam 111. The second shell 11 has a second hollow portion 114, which passes through the second side beam 113 along the first direction X. The second hollow portion 114 is aligned with and connected to all the first hollow portions 22, and the cooling plate 30 is sequentially penetrated by the second hollow portion 114 and all the first hollow portions 22.

[0069] It should be noted that the first side beam 111 is composed of three side panels, and the three side panels are arranged around the bottom plate 12 to form a notch 112, and are all perpendicular to and connected to the bottom plate 12. The bottom plate 12 and the first side beam 111 can be connected by bolts, and the bottom plate 12 and the first side beam 111 are tightly connected together using bolts and nuts. The second side beam 113 and the first side beam 111 can be connected by bolts, and the second side beam 113 and the first side beam 111 are tightly connected together using bolts and nuts. This connection method can provide higher connection strength and stability. The second hollow portion 114 is aligned with and connected to all the first hollow portions 22, indicating that the second hollow portion 114 and all the first hollow portions 22 form a channel, which is used for the installation of the cooling plate 30. The cooling plate 30 passes through the second hollow portion 114 and all the first hollow portions 22 in sequence, providing an installation method for the cooling plate 30. The cooling plate 30 needs to be in the channel formed by the second hollow portion 114 and all the first hollow portions 22, thereby achieving close contact between the cooling plate 30 and the single battery 20 and improving the heat dissipation effect.

[0070] In some embodiments, Figure 2 As shown, the second housing 11 further includes a third side beam 115, which is disposed on a side of the single battery 20 away from the second side beam 113, and presses the single battery 20 to contact the second side beam 113, and the third side beam 115 is connected to the first side beam 111. The second housing 11 further has a third hollow portion 116, which penetrates the third side beam 115 along the first direction X, and the third hollow portion 116, the second hollow portion 114, and all the first hollow portions 22 are aligned with each other and connected, and the cooling plate 30 is sequentially penetrated by the second hollow portion 114, all the first hollow portions 22, and the third hollow portion 116, and the cooling plate 30 is partially penetrated by the third hollow portion 116.

[0071] It should be noted that the third side beam 115 presses the single battery 20 to contact with the second side beam 113, which can increase the overall structural stability of the battery pack. This helps to reduce the movement and deformation of the battery during transportation, vibration or collision, and improves the safety of the battery pack. By contacting the single battery 20 with the second side beam 113, a better heat conduction path can be provided. When the battery is working, heat is generated. Through contact with the second side beam 113, the heat can be more effectively conducted to the second shell 11 and then dissipated, while all the first hollow portions 22 are connected to the second hollow portions 114. This helps to reduce the temperature of the battery and improve the performance and life of the battery. In order to enhance the stability and connection strength of the third side beam 115, it can be considered to add reinforcements or increase the connection area at the connection between the third side beam 115 and the first side beam 111 to improve the stability of the overall structure. The third hollow portion 116 is partially provided through the cooling plate 30 to provide a design space for the basic structure liquid injection port of the cooling plate 30, and the liquid injection port is exposed in the accommodating cavity 13, so as to facilitate the use of external equipment to inject coolant into the cooling plate 30. The cooling plate 30 also has other basic structures, which will not be described one by one here.

[0072] In some embodiments, see Figure 2 , Figure 4 and Figure 5 , Figure 4 The overall structural diagram of the cooling plate provided in the embodiment of the present application is as follows: Figure 5 Provided in the embodiments of this application Figure 4The cross-sectional structural diagram at AA in the middle. The above-mentioned cooling plate 30 includes a cooling plate body 31, and the cooling plate body 31 is sequentially penetrated by the second hollow portion 114, all the first hollow portions 22, and the third hollow portion 116, and is connected to the second shell 11. The cooling plate 30 also has a flow channel 32 and a through hole 33. The flow channel 32 penetrates the cooling plate body 31 along the length direction of the cooling plate body 31. The flow channel 32 is connected with the through hole 33. The through hole 33 is provided on the side wall of the cooling plate body 31 in the thickness direction, and the opening position of the through hole 33 corresponds to the setting position of the first explosion-proof valve 23. It should be noted that the flow channel 32 is used to pass coolant or deionized water so as to effectively take away the heat generated by the single battery 20. Through the flow channel 32, the coolant can flow in the cooling plate body 31, absorb heat and take it away. The through hole 33 is connected to the flow channel 32 so that when thermal runaway occurs, the gas generated by the thermal runaway caused by the first explosion-proof valve 23 can be directly discharged to the external environment of the battery pack along the through hole 33, the flow channel 32, and the second hollow portion 114, thereby isolating the copper busbar harness BDU and electrical components such as the busbar in the battery pack, achieving thermal and electrical separation, and improving the safety performance of the battery pack. This connection design can effectively remove the gas generated when the first explosion-proof valve 23 is depressurized, ensuring the safety of the battery pack. In addition, the setting position of the through hole 33 corresponds to the setting position of the first explosion-proof valve 23, and the number of through holes 33 is the same as the number of first explosion-proof valves 23.

[0073] In view of this, in this embodiment, through the design of the flow channel 32 and the through hole 33, the cooling plate 30 can achieve effective heat dissipation and the exhaust function of the first explosion-proof valve 23 pressure relief. The coolant flows through the flow channel 32, absorbs and takes away the heat generated by the single battery 20, thereby reducing the battery temperature. In addition, when the first explosion-proof valve 23 is depressurized, the generated gas can be discharged through the through hole 33 and the flow channel 32, avoiding gas accumulation and increasing the safety risk of the battery pack.

[0074] In some embodiments, Figure 2 As shown, a second explosion-proof valve 80 is provided on the side of the cooling plate 30 facing the second side beam 113, and a second hollow portion 114 is formed in the cooling plate 30. The second explosion-proof valve 80 is located on the side of the second side beam 113 away from the first side beam 111. The through hole 33 is connected to the flow channel 32, so that when thermal runaway occurs, the gas generated by the pressure relief thermal runaway of the first explosion-proof valve 23 can be directly discharged to the external environment of the battery pack along the through hole 33, the flow channel 32, and the second explosion-proof valve 80, thereby achieving isolation from the copper bus wire harness BDU and electrical components such as the busbar in the battery pack, achieving thermal and electrical separation, and improving the safety performance of the battery pack. It should be noted that this embodiment achieves dry-wet separation, and the water vapor outside the battery pack enters the battery pack through the second explosion-proof valve 80. The condensation is integrated inside the through hole 33 through the action of the through hole 33 and the circulating cooling water to avoid entering the battery pack, thereby achieving dry-wet separation and achieving the electrical safety performance of the battery pack.

[0075] In some embodiments, Figure 2 As shown, the battery pack further includes a first thermally conductive silicone pad 40 and a second thermally conductive silicone pad 50. The first thermally conductive silicone pad 40 is arranged on the side of the cooling plate 30 away from the bottom plate 12 and is connected to the cooling plate 30, and the side of the first thermally conductive silicone pad 40 away from the cooling plate 30 abuts against a first connecting plate 221; the second thermally conductive silicone pad 50 is arranged on the side of the cooling plate 30 facing the bottom plate 12 and is connected to the cooling plate 30, and the side of the second thermally conductive silicone pad 50 away from the cooling plate 30 abuts against another first connecting plate 221. It should be noted that the first thermally conductive silicone pad 40 is usually made of a thermally conductive material and has good thermal conductivity. The function of the first thermally conductive silicone pad 40 is to provide a thermal conduction path between the cooling plate 30 and the single battery 20 so as to effectively transfer the generated heat from one first connecting plate 221 to the side of the cooling plate 30 away from the bottom plate 12. The second thermally conductive silicone pad 50 is usually made of a thermally conductive material and has good thermal conductivity. The function of the second thermally conductive silicone pad 50 is to provide a heat conduction path between the cooling plate 30 and the single battery 20 so as to effectively transfer the generated heat from the other first connecting plate 221 to the side of the cooling plate 30 facing the bottom plate 12 .

[0076] In view of this, the first thermally conductive silicone pad 40 and the second thermally conductive silicone pad 50 can realize heat conduction between the cooling plate 30 and the single battery 20. The first thermally conductive silicone pad 40 and the second thermally conductive silicone pad 50 have good thermal conductivity and softness, and can fill the gap between the cooling plate 30 and the first connecting plate 221, that is, fill part of the first hollow portion 22, to ensure close contact between the cooling plate 30 and the first connecting plate 221. This can minimize thermal resistance and improve the efficiency of heat transfer. The performance and life of the battery will be affected when it works at high temperatures. Through effective heat conduction, the first thermally conductive silicone pad 40 and the second thermally conductive silicone pad 50 can help reduce the battery temperature and reduce heat accumulation, thereby protecting the performance and life of the battery. This is very important for improving the reliability and stability of the battery. At the same time, the design of the first thermally conductive silicone pad 40 and the second thermally conductive silicone pad 50 can be easily disassembled and replaced when needed. This is very helpful for maintaining and repairing the battery pack, which can reduce the difficulty of disassembly and assembly and improve the overall maintainability. That is, the battery pack of this embodiment adopts a heat-conducting pad structure design, adopts a first heat-conducting silicone pad 40 and a second heat-conducting silicone pad 50 for heat exchange, and the monomer batteries 20 are connected by interference fit and seamless connection. The monomer batteries 20 are assembled on the box body 10 after being stacked under overpressure, and the third side beam 115 is connected to the second shell 11, so that the third side beam 115 and the second side beam 113 clamp the battery module together, and the third side beam 115 and the second side beam 113 are connected to the second shell 11 by screw connection. At the same time, the cooling plate 30 is inserted into the second hollow part 114 toward one side of the second side beam 113 to support the monomer battery 20. In this embodiment, the first heat-conducting silicone pad 40 and the second heat-conducting silicone pad 50 replace the traditional heat-conducting structural glue. Such a design simplifies the assembly of the production line, eliminates the traditional glue coating structure design process, eliminates the processes of glue coating, glue pressing, heating and curing, and facilitates the after-sales maintenance of a single or multiple monomer batteries 20, and saves the after-sales maintenance cost, reducing the manufacturing cost and after-sales maintenance cost of the battery pack.

[0077] In some embodiments, see Figure 6 , Figure 7 , Figure 8 and Fig. 9 , Figure 6 This is a schematic diagram of the overall structure of another battery pack provided in an embodiment of the present application. Figure 7 This is an exploded view of the overall structure of another battery pack provided in an embodiment of the present application. Figure 8 This is a schematic diagram of the overall structure of another single cell provided in an embodiment of the present application. Fig. 9A schematic diagram of the structure of another battery module in a battery pack provided in an embodiment of the present application. A single battery cell 20 has two first hollow portions 22, and the two first hollow portions 22 are arranged at intervals along the width direction of the bottom plate 12, and the two first hollow portions 22 penetrate the battery body 21 along the length direction of the bottom plate 12. A plurality of battery cells 20 are stacked in sequence along the length direction of the bottom plate 12 to form a battery module, and the battery module is arranged in the accommodating cavity 13. That is, the battery module has two columns of channels formed by the first hollow portions 22, namely the first channel 60 and the second channel 70.

[0078] Two cooling plates 30 are provided. One cooling plate 30 is connected to the second shell 11 through a first channel 60 , and the other cooling plate 30 is connected to the second shell 11 through a second channel 70 .

[0079] There are two first thermally conductive silicone pads 40 and two second thermally conductive silicone pads 50. One first thermally conductive silicone pad 40 is disposed on the side of a cooling plate 30 away from the bottom plate 12 and connected to the cooling plate 30; another first thermally conductive silicone pad 40 is disposed on the side of another cooling plate 30 away from the bottom plate 12 and connected to the cooling plate 30. One second thermally conductive silicone pad 50 is disposed on the side of a cooling plate 30 facing the bottom plate 12 and connected to the cooling plate 30; another second thermally conductive silicone pad 50 is disposed on the side of another cooling plate 30 facing the bottom plate 12 and connected to the cooling plate 30.

[0080] It should be noted that when the second housing 11 has a second hollow portion 114, the two cooling plates 30 pass through the second hollow portion 114. The second housing 11 may also have two second hollow portions 114, one of which corresponds to and communicates with the first channel 60, and one cooling plate 30 passes through the second hollow portion 114 and the first channel 60; the other second hollow portion 114 corresponds to and communicates with the second channel 70, and the other cooling plate 30 passes through the second hollow portion 114 and the second channel 70.

[0081] In view of this, compared with the single-row first hollow portion 22 scheme, the setting of the double-row first hollow portion 22 makes the heat distribution in the battery module more uniform. By setting the two first hollow portions 22 at intervals along the width direction of the bottom plate 12 and penetrating the battery body 21 along the length direction of the bottom plate 12, the heat generated by the single battery 20 can be better transferred to the cooling plate 30. In this way, the heat dissipation effect of the entire battery module can be improved and the battery temperature can be reduced. The double-row first hollow portion 22 scheme can provide more space for setting the first explosion-proof valve 23. The setting of the first explosion-proof valve 23 can quickly release pressure when the battery is overheated, reduce pressure accumulation, and thus improve safety. Compared with the single-row first hollow portion 22 scheme, the double-row scheme can set more first explosion-proof valves 23, thereby improving the pressure relief efficiency. The manufacturing size of the cooling plate 30, the first thermal conductive silicone pad 40 and the second thermal conductive silicone pad 50 in the double-row first hollow portion 22 scheme is smaller. Such a design can simplify the manufacturing process and is more convenient for processing and molding. In addition, due to the smaller size, it is also more convenient to transport.

[0082] In some embodiments, Figure 2 and Figure 7 As shown, the length of the first hollow portion 22 in the third direction Z is L 1 , the length L of the single battery 20 in the third direction Z 2 , meet 1 / 2L 2 ≤L 1 ≤L 2 It should be noted that, when the first hollow portion 22 is arranged in a single row, L 1 Refers to the length of the single-row first hollow portion 22 in the third direction Z; when it is a double-row first hollow portion 22 solution, L 1 It refers to the total length of the double-row first hollow portions 22 in the third direction Z. It should be noted that by satisfying 1 / 2L 2 ≤L 1 ≤L 2 The size range can adapt to the length changes of different single cells 20. This means that when designing and manufacturing the battery module, single cells 20 of different lengths can be selected, and the length of the first hollow portion 22 can be adjusted as needed. This flexibility can adapt to single cells of different specifications and sizes, and improve the adaptability of the design and manufacture of the battery module.

[0083] In some embodiments, Figure 2 and Figure 7 As shown, the height of the first hollow portion 22 in the second direction Y is H 1 The height of the single battery 20 in the second direction Y is H 2 , meet 1 / 15H 2 ≤H 1 ≤1 / 10H 2It should be noted that by meeting 1 / 15H 2 ≤H 1 ≤1 / 10H 2 The size range can adapt to the height changes of different single cells 20. This means that when designing and manufacturing the battery module, single cells 20 of different heights can be selected and the height of the first hollow portion 22 can be adjusted as needed. This flexibility can adapt to single cells of different specifications and sizes, and improve the adaptability of the design and manufacture of the battery module. In addition, whether it is a single-row first hollow portion 22 solution or a double-row first hollow portion 22 solution, the height H of the first hollow portion 22 in the second direction Y is 1 No impact.

[0084] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0085] The single cell battery provided in the embodiments of the present application is introduced in detail above, and the principles and implementation methods of the present application are explained by applying specific examples. The description of the above embodiments is only used to help understand the technical solution and its core idea of ​​the present application; ordinary technicians in this field should understand that: they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present application.

Claims

1. A single cell battery, characterized in that: include: A battery body having a first direction, a second direction, and a third direction intersecting each other; A first shell, covering the outside of the battery body; The first hollow portion penetrates the battery body and the first shell along the first direction and is connected to the first shell; the first hollow portion includes two first connecting plates and two second connecting plates, the two first connecting plates are arranged opposite to each other along the second direction and are connected to the first shell; the two second connecting plates are arranged opposite to each other along the third direction and are connected to the first shell, and each of the second connecting plates is connected to the two first connecting plates.

2. The single cell according to claim 1, characterized in that: The single battery includes a first explosion-proof valve, and the first explosion-proof valve is arranged on at least one of the second connecting plates.

3. A battery pack, characterized in that: include: A box body, the box body comprising a second shell and a bottom plate, the second shell is connected to the bottom plate, and the second shell is arranged around the bottom plate to form a receiving cavity; A plurality of single cells as claimed in claim 1 or 2, wherein the plurality of single cells are sequentially stacked in the accommodating cavity along the first direction and connected to the second housing; A cooling plate passes through the first hollow parts of all the single cells and is connected to the second shell.

4. The battery pack according to claim 3, characterized in that: The second housing comprises: A first side beam, arranged around the outer portion of the bottom plate to form a notch, the notch being communicated with the accommodating cavity; a second side beam, covering the notch, and the second side beam is connected to the first side beam; The second shell has a second hollow portion, the second hollow portion passes through the second side beam along the first direction, the second hollow portion is aligned with and connected to all the first hollow portions, and the cooling plate passes through the second hollow portion and all the first hollow portions in sequence.

5. The battery pack according to claim 4, characterized in that: The second shell further includes a third side beam, which is disposed on a side of the single battery away from the second side beam and presses the single battery to contact the second side beam, and the third side beam is connected to the first side beam.

6. The battery pack according to claim 5, characterized in that: The second shell also has a third hollow portion, which passes through the third side beam along the first direction. The third hollow portion, the second hollow portion, and all the first hollow portions are aligned with and connected to each other. The cooling plate passes through the second hollow portion, all the first hollow portions, and the third hollow portion in sequence, and the cooling plate partially passes through the third hollow portion.

7. The battery pack according to claim 3, characterized in that: The cooling plate comprises a cooling plate body, and the cooling plate body is penetrated by the first hollow portion and connected to the second shell; The cooling plate also has a flow channel and a through hole. The flow channel penetrates the cooling plate body along the length direction of the cooling plate body. The flow channel is connected to the through hole. The through hole is opened on the side wall of the cooling plate body in the thickness direction, and the opening position of the through hole corresponds to the setting position of the first explosion-proof valve of the single battery.

8. The battery pack according to claim 3, characterized in that: The battery pack further comprises: A first thermally conductive silicone pad is disposed on a side of the cooling plate away from the bottom plate and connected to the cooling plate, and a side of the first thermally conductive silicone pad away from the cooling plate is in contact with a first connecting plate of the first hollow portion; The second thermally conductive silicone pad is arranged on a side of the cooling plate facing the bottom plate and connected to the cooling plate, and the side of the second thermally conductive silicone pad facing away from the cooling plate is in contact with another first connecting plate of the first hollow portion.

9. The battery pack according to claim 3, characterized in that: The length of the first hollow portion in the third direction of the single battery is L1, and the length of the single battery in the third direction is L2, which satisfies 1 / 2L2≤L1≤L2.

10. The battery pack according to claim 3, characterized in that: The height of the first hollow portion in the second direction of the single battery is H1, and the height of the single battery in the second direction is H2, which satisfies 1 / 15H2≤H1≤1 / 10H2.

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