Battery pack and electric device

Abstract

The utility model provides a battery pack and a power utilization device, the battery pack comprises a shell, a battery module and a heat exchange assembly, the battery module is mounted in the shell, the battery module comprises a plurality of battery units arranged side by side, and each battery unit comprises at least one cylindrical battery; the heat exchange assembly penetrates through each cylindrical battery of each battery unit along the axial direction of the cylindrical battery, and the heat exchange assembly is sequentially and circuitously arranged among the plurality of battery units in a penetrating manner. According to the battery pack provided by the invention, the heat exchange assembly penetrates through each cylindrical battery of each battery unit along the axial direction of the cylindrical batteries, and the heat exchange assembly is sequentially and circuitously arranged among the plurality of battery units in a penetrating manner, so that heat exchange between the heat exchange assembly and the batteries is realized by utilizing the flow channels arranged along the axial direction of the cylindrical batteries; the installation space of the heat exchange assembly is saved, the heat dissipation efficiency of the battery module is improved, and the service life of the battery pack is further prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery pack and an electrical device. Background Art

[0002] With the rapid development of the new energy vehicle market, various problems are gradually exposed. At present, the power batteries of pure electric or hybrid vehicles will have a great impact on the battery when charged and discharged at low or high temperatures. The most obvious phenomenon is that charging and discharging at low temperatures is prone to lithium deposition. The voltage of lithium-ion batteries rises rapidly, causing the positive electrode to deposit lithium quickly, and the negative electrode lithium is embedded slowly, which will cause the accumulation of lithium metal on the electrode surface, generating dendrites and causing the battery to short-circuit. Charging and discharging at high temperatures is prone to the risk of thermal runaway of the battery.

[0003] In the related art, a solution of adding liquid cooling and liquid heating to the battery pack is usually adopted, such as setting a serpentine plate on the side wall of the battery. However, the cold plate of the liquid cooling and liquid heating design in the related art is relatively thick and heavy, and the liquid cooling and liquid heating effect is not obvious, and it can only cool the bottom or the side of the battery. Utility Model Content

[0004] The purpose of this application is to provide a battery pack and an electric device to solve the technical problem that the liquid cooling and liquid heating solutions of the battery pack in the prior art are not effective. The various technical effects that can be produced by the preferred technical solution among the various technical solutions provided by the utility model are described in detail below.

[0005] To achieve the above purpose, the technical solution adopted in this application is:

[0006] In a first aspect, the present application provides a battery pack, comprising: a shell, a battery module and a heat exchange assembly, the battery module being installed in the shell, the battery module comprising a plurality of battery cells arranged side by side, each battery cell comprising at least one cylindrical battery; the heat exchange assembly being arranged through each cylindrical battery of each battery cell along the axial direction of the cylindrical battery, and the heat exchange assembly being arranged through the plurality of battery cells in sequence and in a circuitous manner.

[0007] In one or more embodiments of the present application, the positive electrode column and the negative electrode column of the cylindrical battery are respectively located at the two ends of the axial direction of the cylindrical battery, and the heat exchange component can be passed through the positive electrode column and the negative electrode column; when the battery unit includes at least two cylindrical batteries, the two adjacent cylindrical batteries are electrically connected by plugging the positive electrode column of one of the cylindrical batteries and the negative electrode column of the other cylindrical battery, and the heat exchange component is sequentially passed through the positive electrode column of the two adjacent cylindrical batteries and the negative electrode column of the other cylindrical battery.

[0008] In one or more embodiments of the present application, the positive electrode column of the cylindrical battery is protruding from the end surface of the cylindrical battery, the negative electrode column of the cylindrical battery is recessed in the end surface of the cylindrical battery, and the positive electrode column and the negative electrode column match; or,

[0009] The negative pole of the cylindrical battery is protruding from the end surface of the cylindrical battery, and the positive pole of the cylindrical battery is recessed in the end surface of the cylindrical battery, and the negative pole and the positive pole match each other.

[0010] In one or more embodiments of the present application, two cylindrical batteries located at the ends of two adjacent rows of battery cells are electrically connected via a bus bar.

[0011] The bus is provided with a matching boss at the position corresponding to the recessed positive pole or the recessed negative pole to form an electrical connection with the recessed positive pole or the recessed negative pole. The bus is provided with an insulating sealing pad on the side away from the cylindrical battery. The bus is also provided with an avoidance hole to allow the heat exchange component to be passed through, and the avoidance hole passes through the boss and the insulating sealing pad.

[0012] In one or more embodiments of the present application, a channel is provided in the middle of the cylindrical battery along the axial direction of the cylindrical battery.

[0013] The heat exchange component includes an input pipeline, an output pipeline, a heat exchange pipeline located in a channel, and a connecting pipeline for connecting two adjacent heat exchange pipelines. The pipe wall of the heat exchange pipeline is arranged in contact with the inner wall of the channel, and the connection between the heat exchange pipeline and the connecting pipeline, the connection between the heat exchange pipeline and the input pipeline, and the connection between the heat exchange pipeline and the output pipeline are all sealed.

[0014] In one or more embodiments of the present application, a plug is provided at one end of the sealed connection, and a slot is provided at the other end, and the first layer of sealing and locking of the connection is achieved by inserting the plug into the slot;

[0015] Clamp claws are arranged on the outer side of the overlapped part where the plug-in is inserted into the slot, so as to realize the second layer of sealing and locking of the connection part through the clamp claws.

[0016] In one or more embodiments of the present application, two cylindrical batteries located at the ends of two adjacent rows of battery cells are electrically connected through a bus, and the claws are clamped and fixed to the outer side of the overlapping part of the plug and the slot, and the side walls of the claws are pressed against the bus to press the bus onto the two cylindrical batteries.

[0017] In one or more embodiments of the present application, the battery further includes: a heating component and a separator, wherein the heating component is disposed on the separator and contacts the side surface of the cylindrical battery;

[0018] The separator includes a support plate for supporting a plurality of battery cells arranged side by side and a connecting plate connecting two adjacent support plates, the support plate is in an arc structure consistent with the side surface of the cylindrical battery, and the connecting plate is placed in the gap between two adjacent rows of battery cells;

[0019] The heating assembly includes a heating wire, which is arranged along the arc surface of the support plate to fit at least part of the side surface of the cylindrical battery in a direction perpendicular to the axial direction of the cylindrical battery.

[0020] In one or more embodiments of the present application, an exhaust channel is formed on a side of the partition away from the battery cell and between two adjacent support plates and the connecting plate, and an inert gas is contained in the exhaust channel.

[0021] The support plate is provided with an exhaust port, the exhaust port is at least arranged corresponding to the explosion-proof valve of each cylindrical battery, and the exhaust port faces the exhaust channel.

[0022] In a second aspect, the present application further provides an electrical device, comprising the battery pack described in the first aspect.

[0023] Based on the above technical solution, the battery pack and the power device provided by the present application have at least the following beneficial technical effects:

[0024] The battery pack provided by the present application is achieved by inserting a heat exchange component through each cylindrical battery of each battery unit along the axial direction of the cylindrical battery, and the heat exchange component is successively and circuitously inserted between multiple battery units, and then utilizing the flow channel arranged along the axial direction of the cylindrical battery to realize heat exchange between the heat exchange component and the battery, which not only saves the installation space of the heat exchange component, but also can effectively heat the interior of the cylindrical battery, thereby improving the heat dissipation efficiency of the battery module, and thus increasing the service life of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 A schematic diagram of a three-dimensional structure of a battery pack provided for one or more embodiments of the present application;

[0027] Figure 2 A schematic diagram of the structure of a battery module, a heat exchange component and a heating component in a battery pack provided in one or more embodiments of the present application;

[0028] Figure 3 yes Figure 2 A in the enlarged view;

[0029] Figure 4 A schematic diagram of a top view of a heat exchange assembly in a battery pack provided in one or more embodiments of the present application;

[0030] Figure 5A schematic diagram of the structure of the sealed connection of the heat exchange assembly in the battery pack provided by one or more embodiments of the present application;

[0031] Figure 6 A schematic structural diagram of a sealed connection of a heat exchange assembly in a battery pack provided in one or more embodiments of the present application from another perspective;

[0032] Figure 7 A schematic diagram of the structure of a cylindrical battery in a battery pack provided by one or more embodiments of the present application;

[0033] Figure 8 A schematic structural diagram of a cylindrical battery in a battery pack from another perspective provided in one or more embodiments of the present application;

[0034] Fig. 9 A schematic structural diagram of a battery pack from another perspective provided in one or more embodiments of the present application;

[0035] Fig.10 for Fig. 9 The enlarged view of point B in the figure;

[0036] Fig.11 A schematic diagram of the structure of a bus bar in a battery pack provided in one or more embodiments of the present application;

[0037] Fig.12 A schematic structural diagram of a bus bar in a battery pack from another perspective provided in one or more embodiments of the present application;

[0038] Fig.13 A schematic diagram of the structure of the end connection method of two adjacent battery cells in a battery pack provided by one or more embodiments of the present application;

[0039] Fig.14 A schematic diagram of the structure of a fastener in a battery pack provided for one or more embodiments of the present application;

[0040] Fig.15 A schematic diagram of the wiring arrangement of a heating component and a heat exchange component in a battery pack provided for one or more embodiments of the present application.

[0041] In the figure: 1-shell; 2-battery module; 3-heat exchange component; 4-heating component; 5-partition; 21-battery unit; 22-bus; 23-cold plate; 24-exhaust channel; 31-heat exchange pipeline; 32-connecting pipeline; 33-input pipeline; 34-output pipeline; 35-claw; 51-support plate; 52-connecting plate; 53-exhaust port; 220-avoidance hole; 221-insulating sealing pad; 222-boss; 211-cylindrical battery; 301-first wiring harness; 311-plug-in; 321-slot; 351-upper clamp; 352-lower clamp; 353-fastener; 401-second wiring harness; 2111-positive pole; 2112-negative pole; 2113-channel. DETAILED DESCRIPTION

[0042] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0043] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0044] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0045] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0046] In the related art, in order to solve the problem of excessive battery temperature in the battery pack, a liquid cooling plate is usually set at the bottom of the battery pack. However, the liquid cooling plate is usually thick and heavy, usually made of metal material, and accounts for a large proportion of the mass in the entire battery pack. It can only cool the bottom of the battery, and the heat exchange effect is poor, resulting in uneven overall battery temperature, affecting battery life and battery safety.

[0047] Based on the above considerations, in order to solve the technical problem of poor heat exchange effect of the liquid cooling plate of the battery pack in the prior art. The present application provides a battery pack, including: a shell, a battery module and a heat exchange assembly, the battery module is installed in the shell, the battery module includes a plurality of battery cells arranged side by side, each battery cell includes at least one cylindrical battery; the heat exchange assembly is arranged along the axial direction of each cylindrical battery, and the heat exchange assembly is arranged in turn between the plurality of battery cells.

[0048] The battery pack provided by the present application is achieved by inserting a heat exchange component through each cylindrical battery of each battery unit along the axial direction of the cylindrical battery, and the heat exchange component is successively and circuitously inserted between the multiple battery units, and then utilizing the flow channel arranged along the axial direction of the cylindrical battery to achieve heat exchange between the heat exchange component and the battery, which not only saves the installation space of the heat exchange component, but also effectively cools or heats the inside of the cylindrical battery, improves the heat dissipation efficiency of the battery module, and thus increases the service life of the battery pack. In addition, the heat exchange component can both heat and cool the inside of the cylindrical battery, and can be configured as needed. The circuitously arranged heat exchange component can improve the overall sealing and facilitate pipeline management; at the same time, the circuitously arranged heat exchange component is also convenient for production and can improve the overall assembly efficiency.

[0049] The battery pack of the present application is suitable for power batteries, energy storage batteries, electronic devices or mechanical devices.

[0050] The technical solution of the present application is described in detail below in conjunction with the accompanying drawings.

[0051] Please refer to Figure 1 , Figure 2 and Figure 4 An embodiment of the present application provides a battery pack, comprising: a shell 1, a battery module 2 and a heat exchange assembly 3, wherein the battery module 2 is installed in the shell 1, the battery module 2 comprises a plurality of battery cells 21 arranged side by side, each battery cell 21 comprises at least one cylindrical battery 211; a heat exchange assembly 3, wherein the heat exchange assembly 3 penetrates each cylindrical battery 211 of each battery cell 21 along the axial direction of the cylindrical battery 211, and the heat exchange assembly 3 is sequentially and circuitously penetrated between the plurality of battery cells 21.

[0052] The housing 1 is a hollow structure with one end open, and the housing 1 and the cover plate can define a space for accommodating the battery module 2. The cylindrical battery 211 is cylindrical. The cylindrical battery 211 is the smallest unit that constitutes the battery module 2. Each battery cell 21 may include multiple cylindrical batteries 211, and the battery module 2 includes multiple battery cells 21, and the multiple battery cells 21 may be as follows. Figure 1The method shown is arranged side by side and transversely in the housing 1 in a manner that the axes are parallel. The heat exchange component 3 penetrates each cylindrical battery 211 of each battery unit 21 along the axial direction of the cylindrical battery 211, and the heat exchange component 3 is sequentially and circuitously penetrated between multiple battery units 21. It can be understood that: the heat exchange component 3 penetrates and connects each battery unit 21 in sequence along the axial direction of the cylindrical battery 211. For example, the heat exchange component 3 penetrates each cylindrical battery 211 from one end of the outermost battery unit 21 along the axial direction of the cylindrical battery 211, and then penetrates from the other end of the battery unit 21, and then enters from one end of another adjacent battery unit 21, and penetrates each cylindrical battery 211 and then penetrates from the other end, and penetrates each battery unit 21 in sequence in a bent shape. This simplifies the overall structure of the heat exchange component 3 and facilitates the management of liquid in and out.

[0053] In the technical solution of the embodiment of the present application, the heat exchange component 3 is passed through each cylindrical battery 211 of each battery unit 21 along the axial direction of the cylindrical battery 211, and the heat exchange component 3 is passed through the multiple battery units 21 in sequence, and then the flow channel arranged along the axial direction of the cylindrical battery 211 is used to realize the heat exchange between the heat exchange component 3 and the cylindrical battery 211, which not only saves the installation space of the heat exchange component 3, but also effectively exchanges heat inside the cylindrical battery 211, thereby improving the heat dissipation efficiency of the battery module 2, and thus improving the service life of the battery pack.

[0054] In some embodiments, please refer to Figure 2 , Figure 7 and Figure 8 The positive electrode column 2111 and the negative electrode column 2112 of the cylindrical battery 211 are respectively located at the two ends of the axial direction of the cylindrical battery 211, and the heat exchange component 3 can be penetrated by the positive electrode column 2111 and the negative electrode column 2112; when the battery unit 21 includes at least two cylindrical batteries 211, the two adjacent cylindrical batteries 211 are electrically connected by plugging the positive electrode column 2111 of one cylindrical battery 211 and the negative electrode column 2112 of the other cylindrical battery 211, and the heat exchange component 3 is sequentially penetrated by the positive electrode column 2111 of the two adjacent cylindrical batteries 211 and the negative electrode column 2112 of the other cylindrical battery 211.

[0055] Among them, the heat exchange component 3 can be penetrated by the positive column 2111 and the negative column 2112, which can be understood as: the heat exchange component 3 penetrates the positive column 2111 and the negative column 2112 of each cylindrical battery 211. The electrical connection between two adjacent cylindrical batteries 2111 can be achieved by plugging the positive column 2111 of one cylindrical battery 211 and the negative column 2112 of the other cylindrical battery 211 into each other. The heat exchange component 3 sequentially penetrates the positive column 2111 of two adjacent cylindrical batteries 211 and the negative column 2112 of another cylindrical battery 211, which can be understood as: the heat exchange component 3 penetrates the positive column 2111 of two adjacent cylindrical batteries 211 and the negative column 2112 of another cylindrical battery 211.

[0056] In the technical solution of the embodiment of the present application, by disposing the positive electrode column 2111 and the negative electrode column 2112 of the cylindrical battery 211 at the two axial ends of the cylindrical battery 211, when the battery unit 21 includes multiple cylindrical batteries 211, two adjacent cylindrical batteries 211 can be electrically connected by plugging the positive electrode column 2111 of one cylindrical battery 211 into the negative electrode column 2112 of the other cylindrical battery 211, which is easy to install and simple to operate, and flexible assembly between the battery units 21 can be achieved. By passing the heat exchange component 3 through the positive electrode column 2111 and the negative electrode column 2112, and passing the heat exchange component 3 through the positive electrode column 2111 of two adjacent cylindrical batteries 211 and the negative electrode column 2112 of another cylindrical battery 211 in sequence, so that the heat exchange component 3 can be passed through multiple battery cells 21 in sequence, the installation of the heat exchange component 3 is achieved, which can simplify the installation and improve the installation efficiency. At the same time, heat exchange can be performed with the interior of each cylindrical battery 211. At the same time, the heat exchange component 3 can directly exchange heat with the electrode of the cylindrical battery 211, which not only saves the installation space of the heat exchange component, but also improves the heat exchange efficiency with the cylindrical battery 211.

[0057] In some embodiments, please refer to Figure 7 and Figure 8 , the positive electrode column 2111 of the cylindrical battery 211 is protruding from the end surface of the cylindrical battery 211, and the negative electrode column 2112 of the cylindrical battery 211 is recessed in the end surface of the cylindrical battery 211, and the positive electrode column 2111 and the negative electrode column 2112 match each other; or,

[0058] The negative electrode column 2112 of the cylindrical battery 211 is protruding from the end surface of the cylindrical battery 211 , and the positive electrode column 2111 of the cylindrical battery 211 is recessed in the end surface of the cylindrical battery 211 , and the negative electrode column 2112 matches the positive electrode column 2111 .

[0059] Among them, the positive electrode column 2111 can be an annular protrusion protruding from the end face of the cylindrical battery 211, and the negative electrode column 2112 can be an annular groove concavely set on the end face of the cylindrical battery 211. The matching of the positive electrode column 2111 and the negative electrode column 2112 means that the annular protrusion of the positive electrode column 2111 and the annular groove of the negative electrode column 2112 can match and plug with each other, so that the annular protrusion of the positive electrode column 2111 and the annular groove of the negative electrode column 2112 are plugged with each other and electrically connected. Of course, in other embodiments, the positive electrode column 2111 can also be an annular groove concavely set on the end face of the cylindrical battery 211, and the negative electrode column 2112 can also be an annular protrusion protruding from the end face of the cylindrical battery 211.

[0060] In the technical solution of the embodiment of the present application, through the above arrangement, the cylindrical batteries 211 can realize the electrical connection of two adjacent cylindrical batteries 211 by mutual insertion of the positive pole 2111 and the negative pole 2112, which is convenient for installation and relatively simple for operation, and can also realize flexible assembly of the battery unit 21. At the same time, it is convenient for the positive pole 2111 and the negative pole 2112 to be arranged around the outer periphery of the heat exchange component 3 to improve the heat exchange efficiency.

[0061] In some embodiments, Fig. 9 , Fig.10 , Fig.11 , Fig.12 and Fig.13 As shown, two cylindrical batteries 211 located at the ends of two adjacent rows of battery cells 21 are electrically connected through a bus 22. The bus 22 is provided with a matching boss 222 at a position corresponding to the recessed positive column 2111 or the recessed negative column 2112 to form an electrical connection with the recessed positive column 2111 or the negative column 2112. The bus 22 is provided with an insulating sealing gasket 221 on the side away from the cylindrical battery 211. The bus 22 is also provided with an avoidance hole 220 that allows the heat exchange component 3 to be passed through. The avoidance hole 220 passes through the boss 222 and the insulating sealing gasket 221.

[0062] Among them, the bus 22 is used to electrically connect the two cylindrical batteries 211 located at the ends of the two adjacent rows of battery cells 21, so as to realize the series, parallel or mixed connection between the two adjacent rows of battery cells 21. Optionally, the bus 22 includes two connection ends corresponding to the positive pole 2111 and the negative pole 2112 of the two cylindrical batteries 211 arranged side by side, and a boss 222 is provided at the connection end of the positive pole 2111 or the negative pole 2112 recessed in the corresponding cylindrical battery 211, so that the bus 22 can be electrically connected to the positive pole 2111 and the negative pole 2112. In some embodiments, the bus 22 can be electrically connected to the positive pole 2111 and the negative pole 2112 by welding. The avoidance hole 220 can be a through-hole structure that allows the heat exchange component 3 to pass through. So as to realize heat exchange of the bus 22 through the heat exchange component 3 and improve the heat exchange efficiency. Avoidance holes 220 are respectively provided at the two connection ends of the bus 22. The avoidance hole 220 passing through the boss 222 and the insulating sealing gasket 221 can be understood as the boss 222 and the insulating sealing gasket 221 being arranged around the avoidance hole 220 .

[0063] In the technical solution of the embodiment of the present application, through the above arrangement, the two cylindrical batteries 211 at the ends of two adjacent rows of battery cells 21 are electrically connected through the busbar 22, so as to realize the series connection, parallel connection or mixed connection between the battery cells 21. The insulating sealing gasket 221 is arranged on the side of the busbar 22 away from the cylindrical battery 211 to realize the insulating seal with the claw 35 at the sealing connection of the heat exchange component 3.

[0064] In some embodiments, please refer to Figure 7 and Figure 8 A channel 2113 is provided in the middle of the cylindrical battery 211 along the axial direction of the cylindrical battery 211. In some embodiments, please refer to Figure 4 The heat exchange component 3 includes an input pipeline 33, an output pipeline 34, a heat exchange pipeline 31 located in the channel 2113, and a connecting pipeline 32 for connecting two adjacent heat exchange pipelines 31. The pipe wall of the heat exchange pipeline 31 is arranged in contact with the inner wall of the channel 2113, and the connection between the heat exchange pipeline 31 and the connecting pipeline 32, the connection between the heat exchange pipeline 31 and the input pipeline 33, and the connection between the heat exchange pipeline 31 and the output pipeline 34 are all sealed.

[0065] Among them, the channel 2113 can be a through hole that penetrates the positive column 2111 and the negative column 2112 of the cylindrical battery 211. The positive column 2111 and the negative column 2112 are respectively arranged around the channel 2113, so that the tube wall of the heat exchange pipeline 31 is in contact with the positive column 2111 and the negative column 2112 of the cylindrical battery 211, thereby improving the heat exchange effect. The connecting pipeline 32 can be a U-shaped tube. The connecting pipeline 32 can be a metal bellows for easy installation. At the same time, the tube wall of the heat exchange pipeline 31 is also in contact with the inner wall of the avoidance hole 220, so as to exchange heat with the bus 22 to improve the heat exchange effect.

[0066] In the technical solution of the embodiment of the present application, the input pipeline 33 can be an input port for a medium such as liquid cooling water, and the output pipeline 34 can be an output port for a medium such as liquid cooling water. The connecting pipeline 32 is used to seal and connect two adjacent heat exchange pipelines 31. The connecting pipeline 32 can be U-shaped, and the connecting pipeline 32 is arranged at both ends of the heat exchange pipeline 31, so that the medium can enter the heat exchange pipeline 31 from the input pipeline 33, and flow out from the output pipeline 34 after passing through multiple heat exchange pipelines 31 in sequence. At the same time, the connecting pipeline 32 is arranged at both ends of the heat exchange pipeline 31, and can be used to clamp multiple cylindrical batteries 211 sleeved on the heat exchange pipeline 31, so that two adjacent cylindrical batteries 211 are electrically connected. The tube wall of the heat exchange pipeline 31 is arranged in contact with the inner wall of the channel 2113, so that the heat exchange pipeline 31 can fill the channel 2113, improve the heat dissipation efficiency of the heat exchange pipeline 31 and the cylindrical battery 211, and will not occupy additional space in the battery pack. During installation, a plurality of cylindrical batteries can be quickly installed by simply placing them on the heat exchange pipeline 31 .

[0067] In some embodiments, please refer to Figure 4 , Figure 5 and Figure 6 A plug-in 311 is provided at one end of the sealed connection of the heat exchange component 3, and a slot 321 is provided at the other end. The first layer of sealing and locking of the connection is achieved by inserting the plug-in 311 into the slot 321; claws 35 are provided on the outer side of the overlapping part where the plug-in 311 is inserted into the slot 321, so as to achieve the second layer of sealing and locking of the connection through the claws 35.

[0068] In some embodiments, a plug-in 311 is provided at the end of the heat exchange pipeline 31, and the plug-in 311 may be an annular structure protruding from the end of the heat exchange pipeline 31. A slot 321 is provided at the end of the connecting pipeline 32 or the input pipeline 33 or the output pipeline 34, and the slot 321 may be a recessed groove structure, and the nesting of the sealed connection of the heat exchange component is achieved by the mutual insertion of the plug-in 311 and the slot 321. Of course, in some other embodiments, the slot 321 may also be provided at the end of the heat exchange pipeline 31, and the plug-in 311 may be provided at the end of the connecting pipeline 32 or the input pipeline 33 or the output pipeline 34, wherein the mutual insertion of the plug-in 311 and the slot 321 may be an interference fit to improve the sealing effect. In some embodiments, a sealing foam pad is provided on the surface of the slot 321, and the friction between the plug-in 311 and the slot 321 is increased by filling the foam to improve the sealing effect.

[0069] The claw 35 may be a component that can clamp and seal the sealed connection. As shown in FIG. 14 , in some embodiments, the claw 35 includes an upper clamp 351 and a lower clamp 352, and the upper clamp 351 and the lower clamp 352 are respectively clamped on the outer side of the overlap of the plug-in 311 and the slot 321, and fixed and locked by a fastener 353. In some embodiments, the fastener 353 may be an expansion screw. In some embodiments, a sealing foam pad is provided on the outer side of the overlap where the plug-in 311 is inserted into the slot 321, so as to increase the friction of the claw 35, prevent the claw 35 from rotating, and improve the sealing effect. Thus, a double-layer effective seal is achieved at the sealed connection of the heat exchange component.

[0070] In some embodiments, please refer to Fig.13 The two cylindrical batteries 211 at the ends of two adjacent rows of battery cells 21 are electrically connected through the bus 22, and the claws 35 are clamped and fixed to the outer side of the overlapping part of the plug-in 311 and the slot 321, and the side walls of the claws 35 are pressed against the bus 22 to press the bus 22 onto the two cylindrical batteries 211.

[0071] In the technical solution of the embodiment of the present application, the claw 35 is clamped and fixed on the outer side of the overlap of the plug 311 and the slot 321, and the side wall of the claw 35 is pressed against the bus 22 to press the bus 22 against the two cylindrical batteries 211, so as to limit the battery unit 21 and maintain the electrical connection between the cylindrical battery 211 and the bus 22. At the same time, the heat exchange between the pipeline and the claw 35 can be carried out, and the bus 22 can be heat exchanged through the claw 35 to achieve the heat exchange of the bus 22. At the same time, the claw 35 can clamp the multiple cylindrical batteries 211 sleeved on the heat exchange pipeline 31 at both ends of the heat exchange pipeline 31 to achieve the installation of the cylindrical battery 211, and at the same time, the electrical connection between the positive pole and the negative pole of each cylindrical battery 211 is achieved, that is, the cylindrical battery 211 is fixed while the electrical connection is installed, so as to improve the installation efficiency and ensure the stability of the electrical connection. In addition, it is also easy to disassemble, which is conducive to the replacement and maintenance of the cylindrical battery 211.

[0072] In some embodiments, please refer to Figure 2 The battery pack of the embodiment of the present application further includes: a heating component 4 and a partition 5, wherein the heating component 4 is disposed on the partition 5 and contacts the side of the cylindrical battery 211. Figure 3 As shown, the partition 5 includes a support plate 51 for supporting a plurality of battery cells 21 arranged side by side and a connecting plate 52 connecting two adjacent support plates 51, the support plate 51 is an arc structure consistent with the side of the cylindrical battery 211, and the connecting plate 52 is placed in the gap between two adjacent rows of battery cells 21; the heating component 4 includes a heating wire, and compared with the heat exchange component 3, the heating wire can improve the heating efficiency of the cylindrical battery 211, and at the same time, the heating wire is arranged along the arc surface of the support plate 51 to fit at least part of the side of the cylindrical battery 211 in a direction perpendicular to the axial direction of the cylindrical battery 211, thereby improving the radial heating uniformity of the cylindrical battery 211.

[0073] The heating wire can be made of copper wire or steel wire. The heating wire can be integrated with the partition 5 by etching. For example, the heating wire is etched on the partition 5 through two layers of polyimide film coating, so that it has good thermal conductivity and low manufacturing cost, which reduces the production cost. The heating wire can be etched according to the results of thermal management simulation to arrange its density and quantity, so as to achieve the effect of directly, accurately and quickly heating the battery.

[0074] In the technical solution of the embodiment of the present application, the support plate 51 of the partition 5 is used to support the cylindrical battery 211 and arrange the cylindrical battery 211 horizontally. The heating wire is arranged along the arc surface of the support plate 51 to fit at least part of the side surface of the cylindrical battery 211 in a direction perpendicular to the axial direction of the cylindrical battery 211, so that the outer side of the cylindrical battery 211 is heated by the heating wire. The heating rate is fast. When the temperature of the battery pack is lower than the set temperature, the heating wire can be turned on to achieve rapid heating of the cylindrical battery, thereby achieving the effect of rapid heating of the cylindrical battery.

[0075] like Fig.15 As shown, the circuitous lines of the heating component 4 and the heat exchange component 3 are intersecting, and the two do not interfere with each other, and the layout is reasonable. The direction of the arrow of the first harness 301 is the flow direction of the heat exchange medium of the heat exchange component 3, and the middle of the heat exchange cylindrical battery 211; the direction of the second harness 401 is the heating direction of the heating component 4, and the heating wire includes a first section extending along the axis perpendicular to the cylindrical battery 211, and a second section connecting two adjacent first sections. The first section and the second section are alternately connected to form a circuitous line. The extension direction of the first section of the heating wire and the extension direction of the heat exchange pipeline 31 are perpendicular to each other, so as to realize the axial and radial heat exchange of the cylindrical battery 211 and improve the temperature uniformity of the cylindrical battery 211. According to the temperature collected by the temperature sensor, when the temperature is higher than the set temperature, the cooling mode is turned on, and cooling can be achieved through the heat exchange component 3; when the temperature collected by the temperature sensor is lower than the set temperature, the heating mode is turned on, and heating can be achieved through the heat exchange component 3 and / or the heating component 4; when it is determined that the temperature difference is large and the temperature is uneven according to the temperatures collected by multiple temperature sensors, the heat exchange component 3 and the heating component 4 can be turned on at the same time, and heat can be exchanged in the axial and radial directions of the cylindrical battery 211 at the same time to ensure that heat can be exchanged in both the axial and radial directions to improve the uniformity of the battery temperature and ensure the battery life. In particular, when the temperature is lower than the preset temperature and the temperature is uneven, the heat exchange component 3 and the heating component 4 can achieve heating at the same time, which not only improves the heating efficiency, but also improves the heating uniformity and ensures the battery life.

[0076] In some embodiments, please refer to Fig. 9 and Fig.10 An exhaust channel 24 is formed on the side of the partition 5 away from the battery unit 21 and between two adjacent support plates 51 and the connecting plate 52. Inert gas is contained in the exhaust channel 24. The support plate 51 is provided with an exhaust port 53. The exhaust port 53 is at least corresponding to the explosion-proof valve of each cylindrical battery 211, and the exhaust port 53 faces the exhaust channel 24.

[0077] In the technical solution of the embodiment of the present application, by forming an exhaust channel 24 between the two support plates 51 and the connecting plate 52 of the partition, directional exhaust pressure relief can be achieved through the exhaust channel, reducing the risk of thermal runaway of the cylindrical battery, and by setting an inert gas in the exhaust channel 24, when a battery has thermal runaway, it can quickly extinguish the fire and play the role of isolating oxygen. An exhaust port 53 is set on the support plate 51, and the exhaust port 53 corresponds to at least the explosion-proof valve setting of each cylindrical battery 211, and the exhaust port 53 faces the exhaust channel 24, so that when thermal runaway occurs, each cylindrical battery 211 can be exhausted to the exhaust channel 24 through the exhaust port 53, so as to discharge the gas generated by thermal runaway in time, and it is not easy to cause a chain reaction when the battery has thermal runaway.

[0078] In some embodiments, please refer to Fig. 9 and Fig.10 A cold plate 23 is also provided between the partition plate 5 and the shell 1 .

[0079] In the technical solution of the embodiment of the present application, a cold plate 23 is arranged between the partition 5 and the shell 1 to achieve multiple heat exchange effects through heat exchange between the cold plate 23 and the side of the cylindrical battery 211, wherein the cold plate 23 can achieve both heating and heat dissipation.

[0080] The battery pack of the embodiment of the present application has both heat exchange and heating functions, and can cooperate with the BMS of the battery pack to start the heating component and / or heat exchange component at low temperatures, and start the heat exchange component at high temperatures, so as to achieve fast, accurate and multi-faceted heating or heat exchange of cylindrical batteries, improve the heating or heat dissipation effect, and increase the service life of the battery. At the same time, when cooling or heating is insufficient, further heating or heat dissipation can be achieved through a cold plate, further improving the heating or heat dissipation effect.

[0081] On the other hand, the present application also provides an electrical device, including the battery pack. The electrical device may be an electrical device that uses a battery pack as a power source or various energy storage systems that use a battery pack as an energy storage element. The electrical device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, and the like. Among them, the electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like, and the spacecraft may include airplanes, rockets, space shuttles, and spacecraft, and the like.

[0082] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A battery pack, characterized in that: include: Housing (1); A battery module (2) is installed in the housing (1), the battery module (2) comprising a plurality of battery cells (21) arranged side by side, each of the battery cells (21) comprising at least one cylindrical battery (211); A heat exchange component (3), wherein the heat exchange component (3) is arranged along the axial direction of the cylindrical battery (211) to penetrate each cylindrical battery (211) of each battery unit (21), and the heat exchange component (3) is arranged in a circuitous manner between the plurality of battery units (21) in sequence.

2. The battery pack according to claim 1, characterized in that: The positive electrode column (2111) and the negative electrode column (2112) of the cylindrical battery (211) are respectively located at two ends of the axial direction of the cylindrical battery (211), and the heat exchange component (3) can be penetrated by the positive electrode column (2111) and the negative electrode column (2112); when the battery unit (21) includes at least two cylindrical batteries (211), two adjacent cylindrical batteries (211) are electrically connected by plugging the positive electrode column (2111) of one cylindrical battery (211) and the negative electrode column (2112) of the other cylindrical battery (211), and the heat exchange component (3) is sequentially penetrated by the positive electrode column (2111) of the two adjacent cylindrical batteries (211) and the negative electrode column (2112) of the other cylindrical battery (211).

3. The battery pack according to claim 2, characterized in that: The positive electrode column (2111) of the cylindrical battery (211) is arranged protruding from the end surface of the cylindrical battery (211), and the negative electrode column (2112) of the cylindrical battery (211) is arranged recessed on the end surface of the cylindrical battery (211), and the positive electrode column (2111) and the negative electrode column (2112) match each other; or, The negative electrode column (2112) of the cylindrical battery (211) is arranged protruding from the end surface of the cylindrical battery (211), and the positive electrode column (2111) of the cylindrical battery (211) is arranged recessed on the end surface of the cylindrical battery (211), and the negative electrode column (2112) and the positive electrode column (2111) are matched.

4. The battery pack according to claim 3, characterized in that: Two cylindrical batteries (211) located at the ends of two adjacent rows of battery cells (21) are electrically connected via a bus bar (22). The busbar (22) is provided with a matching boss (222) at a position corresponding to the recessed positive pole (2111) or the recessed negative pole (2112) so as to form an electrical connection with the recessed positive pole (2111) or the recessed negative pole (2112); the busbar (22) is provided with an insulating sealing gasket (221) on a side away from the cylindrical battery (211); the busbar (22) is also provided with an avoidance hole (220) for allowing the heat exchange component (3) to pass through; the avoidance hole (220) passes through the boss (222) and the insulating sealing gasket (221).

5. The battery pack according to any one of claims 1 to 4, characterized in that: A channel (2113) is provided in the middle of the cylindrical battery (211) along the axial direction of the cylindrical battery (211). The heat exchange component (3) comprises an input pipeline (33), an output pipeline (34), a heat exchange pipeline (31) located in the channel (2113), and a connecting pipeline (32) for connecting two adjacent heat exchange pipelines (31); the pipe wall of the heat exchange pipeline (31) is arranged in contact with the inner wall of the channel (2113); and the connection between the heat exchange pipeline (31) and the connecting pipeline (32), the connection between the heat exchange pipeline (31) and the input pipeline (33), and the connection between the heat exchange pipeline (31) and the output pipeline (34) are all sealed.

6. The battery pack according to claim 5, characterized in that: A plug-in (311) is provided at one end of the sealed connection, and a slot (321) is provided at the other end of the sealed connection, and the first layer of sealing and locking of the connection is achieved by inserting the plug-in (311) into the slot (321); Clamping claws (35) are provided on the outer side of the overlapping portion where the plug-in unit (311) is inserted into the slot (321), so as to realize a second layer of sealing and locking at the connection portion through the clamping claws (35).

7. The battery pack according to claim 6, characterized in that: Two cylindrical batteries (211) located at the ends of two adjacent rows of battery cells (21) are electrically connected via a bus bar (22); the clamping claw (35) is clamped and fixed to the outer side of the overlapping portion of the plug-in (311) and the slot (321), and the side wall of the clamping claw (35) is abutted against the bus bar (22) to press the bus bar (22) onto the two cylindrical batteries (211).

8. The battery pack according to any one of claims 1 to 4, characterized in that: Also includes: A heating component (4) and a partition (5), wherein the heating component (4) is disposed on the partition (5) and contacts the side surface of the cylindrical battery (211); The partition (5) comprises a support plate (51) for supporting a plurality of battery cells (21) arranged side by side and a connecting plate (52) connecting two adjacent support plates (51); the support plate (51) has an arc surface structure consistent with the side surface of the cylindrical battery (211); and the connecting plate (52) is placed in the gap between two adjacent rows of battery cells (21); The heating assembly (4) comprises a heating wire, and the heating wire is arranged along the arc surface of the support plate (51) so as to fit at least part of the side surface of the cylindrical battery (211) in a direction perpendicular to the axial direction of the cylindrical battery (211).

9. The battery pack according to claim 8, characterized in that: An exhaust channel (24) is formed on a side of the partition (5) facing away from the battery unit (21) and between two adjacent support plates (51) and the connecting plate (52), wherein an inert gas is contained in the exhaust channel (24). The support plate (51) is provided with an exhaust port (53), the exhaust port (53) is arranged at least corresponding to the explosion-proof valve of each cylindrical battery (211), and the exhaust port (53) faces the exhaust channel (24).

10. An electrical device, characterized in that: A battery pack comprising any one of claims 1 to 9.

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