Battery and electric device

Abstract

The utility model relates to the technical field of batteries, and discloses a battery and an electric device, which comprises at least two battery monomers, an electrode connecting piece and an external cooling device, each battery monomer comprises a shell and a pole arranged on the top cover, and the poles of at least two battery monomers are electrically connected through an electrode connecting piece; a built-in cooling device for accommodating a cooling medium is arranged in each battery monomer; the external cooling device is arranged between the shell of the battery monomer and the electrode connecting piece, and is at least in contact with one of the shell and the electrode connecting piece. The space between the shell and the electrode connecting piece is fully utilized, so that the space utilization rate is improved, energy density does not need to be sacrificed, and the temperature difference between the inside and the outside can be reduced and the performance of the battery monomer and the battery can be improved by directly radiating the inside and the outside of the battery monomer.

Description

Technical Field

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

[0002] As a new type of secondary battery, lithium-ion battery has the advantages of high energy density, high capacity, light weight, small size, long cycle life and environmental protection, and has great application prospects in energy storage.

[0003] At present, the traditional heat dissipation method for modules and battery packs is to set a cooling plate on the outer surface of the battery cell, such as the top, bottom, side, etc. of the battery cell, to ensure the heat dissipation of the battery cell. The disadvantage of this method is that the existing cooling plate is a certain distance away from the surface of the battery cell, and its layout requires sacrificing the space in the dimension direction of the module and battery pack, resulting in low space utilization and low energy density of the module and battery pack. The heat dissipation performed by the existing cooling plate is indirect heat dissipation with low heat dissipation efficiency, and cannot play a role in the internal heat dissipation of the battery cell. The temperature difference between the inside and outside of the battery cell is large, which affects the battery performance.

[0004] Therefore, it is necessary to improve the existing technology.

[0005] The above information is presented as background information only to assist with understanding the present disclosure and no determination or admission is made as to whether any of the above may be used as prior art with respect to the present disclosure. Utility Model Content

[0006] The utility model provides a battery and an electric device to solve the problems existing in the prior art.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] In a first aspect, the utility model provides a battery, comprising at least two battery cells, an electrode connector and an external cooling device; wherein:

[0009] Each battery cell comprises a shell and a pole arranged on the shell, and the poles of at least two battery cells are electrically connected through an electrode connector;

[0010] Each battery cell is provided with a built-in cooling device for accommodating a cooling medium;

[0011] The external cooling device is arranged between the shell and the electrode connector, and is in contact with at least one of the shell and the electrode connector.

[0012] Furthermore, in the battery:

[0013] Each battery cell has an inlet for the cooling medium to flow into the built-in cooling device and an outlet for the cooling medium to flow out.

[0014] The shell comprises a shell body and a top cover, the top cover is buckled with the opening of the shell body, the pole is arranged on the top cover, and the inlet and the outlet are opened on the top cover or the pole.

[0015] Furthermore, in the battery:

[0016] Along the length direction of the top cover, the top cover is provided with a first pole and a second pole with opposite electrical properties at intervals. Each battery cell includes an inlet and an outlet. The inlet is provided on a side of the first pole away from the second pole, and the outlet is provided on a side of the second pole away from the first pole.

[0017] Furthermore, in the battery:

[0018] The external cooling device includes an external cooling pipeline;

[0019] At least two battery cells are connected in parallel in sequence, and the internal cooling devices of each battery cell are connected in parallel through an external cooling pipeline;

[0020] Along the parallel path of the battery cells, the inlets of all the battery cells are connected through one external cooling pipeline, and the outlets are connected through another external cooling pipeline.

[0021] Furthermore, in the battery:

[0022] The external cooling device includes an external cooling pipeline;

[0023] At least two battery cells are connected in series to form a battery unit, and the internal cooling devices of each battery cell are connected in series through an external cooling pipeline;

[0024] Along the series path of the battery cells, in two adjacent battery cells, the outlet of the preceding battery cell is connected to the inlet of the following battery cell through an external cooling pipeline.

[0025] Furthermore, in the battery:

[0026] The battery cells are divided into at least two groups, and the battery cells in each group are sequentially connected in parallel;

[0027] Along the series path of the battery cells in each group of battery units, the inlet of the first battery cell in each group of battery units is connected in parallel through an external cooling pipeline, and the outlet of the last battery cell is connected through another external cooling pipeline.

[0028] Furthermore, in the battery:

[0029] Along the length direction of the top cover, the top cover is provided with a first pole and a second pole with opposite electrical properties at intervals; each battery cell includes two inlets and two outlets;

[0030] One inlet and one outlet are arranged close to the first pole and are respectively located on both sides of the first pole along the width direction of the top cover; the other inlet and the other outlet are arranged close to the second pole and are respectively located on both sides of the second pole along the width direction of the top cover; the two inlets are located on one side of the top cover along the width direction thereof, and the two outlets are located on the other side of the top cover along the width direction thereof.

[0031] Furthermore, in the battery:

[0032] The external cooling device includes an external cooling pipeline;

[0033] At least two battery cells are connected in parallel in sequence;

[0034] Along the parallel path of the battery cells, in two adjacent battery cells, one outlet of the preceding battery cell is connected to one inlet of the succeeding battery cell through an external cooling pipeline, and the other outlet of the preceding battery cell is connected to the other inlet of the succeeding battery cell through another external cooling pipeline.

[0035] Furthermore, in the battery:

[0036] Along the parallel path of the battery cells, two external cooling pipelines are cross-arranged in two adjacent battery cells.

[0037] Furthermore, in the battery, the external cooling device is a conformal structure of the electrode connector.

[0038] In a second aspect, the utility model provides an electrical device, comprising the battery provided in the first aspect.

[0039] Compared with the prior art, the utility model has the following beneficial effects:

[0040] The utility model provides a battery and an electrical device, comprising at least two battery cells, an electrode connector and an external cooling device. By arranging a built-in cooling device inside each battery cell, and arranging an external cooling device connected to the built-in cooling device between the outer shell of the battery cell and the electrode connector, the space between the outer shell and the electrode connector is fully utilized, thereby improving the space utilization rate without sacrificing the energy density of the battery cell. In addition, since the heat is directly dissipated to the inside and outside of the battery cell, the temperature difference between the inside and outside of the battery cell can be reduced, thereby improving the performance of the battery cell.

[0041] The present invention has other characteristics and advantages, which will be apparent from the accompanying drawings and subsequent specific embodiments incorporated herein, or will be described in detail in the accompanying drawings and subsequent specific embodiments incorporated herein, which together are used to explain the specific principles of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0043] Figure 1 It is a schematic diagram of the structure (assembly) of the battery provided in the first embodiment of the utility model;

[0044] Figure 2 It is a schematic diagram of the structure (explosion) of the battery provided in the first embodiment of the utility model;

[0045] Figure 3 It is a structural (stereoscopic) schematic diagram of a battery cell provided in the first embodiment of the utility model;

[0046] Figure 4 It is a schematic diagram of the structure (top view) of a battery cell provided in the first embodiment of the utility model;

[0047] Figure 5 It is a schematic diagram of the structure (top view) of a battery cell provided in the first embodiment of the utility model;

[0048] Figure 6 This is a schematic diagram of the structure (top view) of battery cells connected in parallel provided by the first embodiment of the utility model;

[0049] Figure 7 This is a schematic diagram (top view) of a structure in which battery cells are connected in series according to the first embodiment of the present utility model;

[0050] Figure 8 This is a schematic diagram (top view) of a structure in which battery cells are connected in series according to the first embodiment of the present utility model;

[0051] Fig. 9 This is a schematic diagram of the structure (top view) of the battery monomers connected in series and parallel in a mixed manner provided in the first embodiment of the utility model;

[0052] Fig.10 This is a structural (stereoscopic) schematic diagram of battery cells connected in series provided by the first embodiment of the utility model;

[0053] Fig.11 This is a schematic diagram of the structure (top view) of the battery monomers connected in series and parallel in a mixed manner provided in the first embodiment of the utility model;

[0054] Fig.12 It is a schematic diagram of the structure (top view) of a battery cell provided in the first embodiment of the utility model;

[0055] Fig.13 It is a schematic diagram of the structure (top view) of two external cooling pipelines 31 provided in the first embodiment of the present utility model, which are arranged crosswise in space.

[0056] Reference numerals:

[0057] Battery cell 1, electrode connector 2, external cooling device 3, inlet 4, outlet 5, pole 6, top cover 7;

[0058] External cooling pipeline 31;

[0059] A first pole 61 and a second pole 62 . DETAILED DESCRIPTION

[0060] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. In addition, ordinary technicians in this field can know that with the development of technology and the emergence of new scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0061] In the description of the present application, it should be understood that, unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as those commonly understood by those skilled in the art of the present application. In addition, any terminology used is only for the purpose of describing specific embodiments and is not intended to limit the present application.

[0062] In addition, in order to better illustrate the present application, numerous specific details are given in the following specific embodiments. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.

[0063] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0064] Embodiment 1

[0065] In view of the above-mentioned defects of existing battery modules and battery packs, the applicant, based on many years of rich practical experience and professional knowledge in the design and manufacture of such products, and in conjunction with the application of theory, actively conducts research and innovation in the hope of creating a technology that can solve the defects in the existing technology and make the battery module and battery pack more practical. After continuous research and design, and after repeated trial production and improvement, the present utility model with real practical value was finally created.

[0066] Please refer to Figure 1-3 The present utility model provides a battery, comprising at least two battery cells 1, an electrode connector 2 and an external cooling device 3; wherein,

[0067] Each battery cell 1 includes a shell and a pole 6 arranged on the shell, and the poles 6 of at least two battery cells 1 are electrically connected through an electrode connector 2;

[0068] Each battery cell 1 is provided with a built-in cooling device for accommodating a cooling medium;

[0069] The external cooling device 3 is disposed between the housing and the electrode connector 2 , and is in contact with at least one of the housing and the electrode connector 2 .

[0070] In this embodiment, each of the battery cells 1 is provided with an inlet 4 for the cooling medium to flow into the built-in cooling device and an outlet 5 for the cooling medium to flow out;

[0071] The housing in this embodiment includes a housing body and a top cover 7 , the top cover 7 is buckled with the opening of the housing body, the pole 6 is arranged on the top cover 7 , and the inlet 4 and the outlet 5 are provided on the top cover 7 or the pole 6 .

[0072] It should be noted that a battery refers to at least two battery cells 1 connected together in a certain combination to form a battery combination with specific characteristics such as voltage and capacity, which can be a battery module or a battery pack.

[0073] The electrode connector 2, also called the busbar, is a very important component of the battery module or battery pack. It connects different battery cells 1 and is also the main channel for current transmission in the battery module or battery pack.

[0074] At least two battery cells 1 may be connected in series and / or in parallel via the electrode connector 2. For example, at least two battery cells 1 may be connected in series; or at least two battery cells 1 may be connected in parallel; or at least three battery cells 1 may be connected in series with at least two of them first and then connected in parallel with at least one of them; or at least three battery cells 1 may be connected in parallel with at least two of them first and then connected in series with at least one of them. Any selection may be made according to actual needs.

[0075] This embodiment is dedicated to solving two key problems existing in the prior art: large temperature difference between the inside and outside of the battery cell, low space utilization, and low energy density of the battery cell and battery. In order to solve these problems, this embodiment adopts a series of innovative designs and measures.

[0076] First, in order to solve the problem of large temperature difference between the inside and outside of the battery cell, this embodiment not only sets an external cooling device 3 on the outside of the battery cell 1, but also sets an internal cooling device inside each battery cell 1. This internal and external dual cooling design not only allows direct heat dissipation of the inside and outside of the battery cell 1, but also optimizes the design of the external cooling device 3 to be connected to the internal cooling device, so that heat can be transferred from the inside of the battery cell to the outside faster, thereby significantly reducing the temperature difference between the inside and outside of the battery cell. Such improvements not only improve the performance of the battery cell and the battery, but also extend the service life of the battery cell and the battery.

[0077] Secondly, in order to solve the problem of low space utilization and low energy density of battery cells and batteries, this embodiment makes full use of the space between the top cover 7 and the electrode connector 2, that is, this embodiment cleverly sets the external cooling device 3 in this space. This design not only improves the overall space utilization, but also does not need to sacrifice the space in the dimension direction of the battery cells. Through such improvements, this embodiment successfully ensures the energy density, so that the battery cells and batteries can meet the application requirements of compact space while maintaining high performance.

[0078] In general, this embodiment effectively solves the problems of large temperature difference between the inside and outside of the battery cell, low space utilization, and low energy density of the battery cell and battery in the prior art through innovative cooling design and space utilization scheme. These improvements not only improve the performance and life of the battery cell and battery, but also optimize the space utilization and energy density of the battery cell and battery, providing a more reliable and efficient energy solution for various applications.

[0079] It is understandable that the electrode connector 2 is a current converging path in the battery, and its heating phenomenon is inevitable, and in the entire battery, the heating phenomenon of the electrode connector 2 is also the most serious. In order to ensure that the performance of the battery is not affected, it is particularly important to effectively dissipate heat for the electrode connector 2. In this embodiment, after the external cooling device 3 is provided on the outside of the battery cell 1, by contacting it with at least one of the top cover 7 and the electrode connector 2, at least the electrode connector 2 is cooled, or at least the top cover 7 is cooled, or the electrode connector 2 and the top cover 7 are cooled. The double heat dissipation effect is achieved.

[0080] Specifically, the external cooling device 3 is made of a material with good thermal conductivity. When the external cooling device 3 is in contact with the electrode connector 2, the heat generated by the electrode connector 2 can be quickly transferred to the external cooling device 3. At the same time, when the external cooling device 3 is also in close contact with the top cover 7, the top cover 7 can also effectively dissipate heat. This dual heat dissipation design not only improves the heat dissipation efficiency, but also reduces the performance degradation and safety hazards caused by heat accumulation.

[0081] In addition, although the shape of the battery cell 1 in this embodiment is shown as a square, the shape of the battery cell 1 includes but is not limited to a square, a cylinder, a hexahedron or a special shape, etc. Moreover, the shapes of different battery cells 1 may be the same or different.

[0082] Please refer to Figure 4 In the first implementation of this embodiment, the inlet 4 and the outlet 5 are opened on the top cover 7.

[0083] It should be noted that the top cover 7 is usually made of metal material, has certain strength and durability, and can withstand the hole-opening process of the inlet 4 and the outlet 5. The inlet 4 and the outlet 5 can be a hole in a circular or square shape. By opening the inlet 4 and the outlet 5 on the top cover 7, the cooling medium can be easily flowed in and out.

[0084] It is understandable that the inlet 4 and the outlet 5 may be arranged at intervals along the length direction of the battery cell 1, or may be arranged at intervals along the thickness direction of the battery cell 1. The specific selection may be made according to actual needs.

[0085] Please refer to Figure 5 In a second implementation of this embodiment, the inlet 4 and the outlet 5 can be opened on the pole 6.

[0086] It should be noted that the pole 6 is also made of metal material and can withstand the opening process of the inlet 4 and the outlet 5. Therefore, the inlet 4 and the outlet 5 can also be opened on the pole 6. Similarly, the inlet 4 and the outlet 5 can be arranged at intervals along the length direction of the battery cell 1, or can be arranged at intervals along the thickness direction of the battery cell 1.

[0087] Although the top cover 7 has a larger area than the pole 6, which is more conducive to selecting the appropriate positions of the inlet 4 and the outlet 5 and designing the sizes, if the internal cooling device is arranged in the pole 6, it is chosen to open the inlet 4 and the outlet 5 on the pole 6, which can make the battery structure more compact and help improve the overall aesthetics and practicality of the battery.

[0088] It is understandable that no matter whether the inlet 4 and the outlet 5 are opened on the top cover 7 or the pole 6, multiple factors need to be considered comprehensively, including the battery structure, cooling effect, aesthetics and practicality, etc. Only on the basis of fully considering these factors can a high-performance and high-reliability battery be manufactured to meet the needs of various application scenarios.

[0089] Please refer again Figure 4 In the present embodiment, in the case where the inlet 4 and the outlet 5 are opened on the top cover 7, on the one hand, along the length direction of the top cover 7, the top cover 7 is provided with a first pole 61 and a second pole 62 with opposite electrical properties at intervals, and each battery cell 1 includes an inlet 4 and an outlet 5, the inlet 4 is provided on the side of the first pole 61 away from the second pole 62, and the outlet 5 is provided on the side of the second pole 62 away from the first pole 61.

[0090] It should be noted that two poles 6 with opposite electrical properties, namely, a first pole 61 and a second pole 62, are cleverly arranged on the top cover 7 of the battery cell 1 along its length direction. The two poles 6 not only serve as key nodes for current transmission between the battery cells 1, but also provide a reasonable layout space for the flow of cooling medium.

[0091] It can be understood that by designing the inlet 4 to be located on the side of the first pole 61 away from the second pole 62, and the outlet 5 to be located on the side of the second pole 62 away from the first pole 61, such a layout ensures that the cooling medium can flow in from one end of the battery cell 1 along the longest path, circulate through the internal cooling device, and then flow out from the other end, forming a complete and efficient cooling circuit.

[0092] This design not only avoids direct contact between the cooling medium and the pole 6, reducing possible electrochemical reactions, but also ensures that the cooling medium can cover more areas inside the battery cell 1, achieving a more uniform heat dissipation effect.

[0093] Please refer to Figure 6 In the first implementation of this embodiment, the external cooling device 3 includes an external cooling pipeline 31;

[0094] At least two battery cells 1 are connected in parallel in sequence, and the internal cooling devices of each battery cell 1 are connected in parallel through an external cooling pipeline 31;

[0095] Along the parallel path of the battery cells 1 , the inlets 4 of all the battery cells 1 are connected via one external cooling pipeline 31 , and the outlets 5 are connected via another external cooling pipeline 31 .

[0096] It should be noted that the advantages of the parallel connection method are:

[0097] (1) Uniform flow distribution: In the parallel connection mode, each battery cell 1 receives the cooling medium independently, so that the cooling medium is less affected by the battery and the temperature rise is slower, thereby achieving a more uniform cooling effect inside the battery.

[0098] (2) High flexibility: The parallel connection method can better adapt to different cooling requirements. Since each battery cell 1 receives the cooling medium independently, the flow rate and temperature of each battery cell 1 can be adjusted as needed to meet the cooling requirements of different battery cells 1.

[0099] (3) Easy to expand: If more battery cells 1 need to be added, the parallel connection method can be expanded more easily. New battery cells 1 can be simply added to the system and the external cooling pipeline 31 can be configured accordingly without affecting the heat dissipation of the existing battery cells 1.

[0100] Please refer to Figure 7-8 , 10, in the second implementation mode of this embodiment, the external cooling device 3 includes an external cooling pipeline 31;

[0101] At least two battery cells 1 are connected in series in sequence to form a battery unit, and the internal cooling devices of each battery cell 1 are connected in series through an external cooling pipeline 31;

[0102] Along the series path of the battery cells 1 , in two adjacent battery cells 1 , the outlet 5 of the preceding battery cell 1 is connected to the inlet 4 of the succeeding battery cell 1 via an external cooling pipeline 31 .

[0103] It should be noted that the advantages of the serial connection method are:

[0104] (1) Flow control: The series connection method can better control the flow of the cooling medium. Since the flow of the cooling medium is continuous, if Figure 7-8In the case of only two battery cells 1 shown, the cooling medium flows in from the inlet 4 of one of the battery cells 1 and flows out from the outlet 5 of the other battery cell 1. Fig.10 For the several battery cells 1 shown, the cooling medium flows in from the inlet 4 of the battery cell 1 arranged in the front, flows through the battery cells 1 in the middle in sequence, and flows out from the outlet 5 of the battery cell 1 arranged in the back. Therefore, the temperature and flow rate of the cooling medium can be better monitored and controlled to meet the cooling requirements.

[0105] (2) Stable pressure: Since the flow of the cooling medium is continuous, a stable pressure can be maintained. This helps ensure that each single cell 1 in the battery can get enough cooling medium and maintain a stable cooling effect.

[0106] Understandably, Figure 7 and Figure 8 The difference is that at least two battery cells 1 are arranged in different directions. Figure 7 In the embodiment, at least two battery cells 1 are arranged along the length direction of the battery cell 1, and Figure 8 In the embodiment, at least two battery cells 1 are arranged along the thickness direction of the battery cell 1 .

[0107] Please refer to Figure 9-11 In the third implementation of this embodiment, which is an improvement based on the second implementation, there are at least two groups of battery cells, and the battery cells in each group are connected in parallel in sequence;

[0108] Along the series path of the battery cells 1 in each group of battery units, the inlet 4 of the first battery cell 1 in each group of battery units is connected in parallel through one external cooling pipeline 31 , and the outlet 5 of the last battery cell 1 is connected through another external cooling pipeline 31 .

[0109] It should be noted that this implementation is actually a design of mixed series and parallel connections.

[0110] Understandably, Fig. 9 The figure shows a situation where two battery cells 1 are connected in series and then connected in parallel with another two battery cells 1 connected in series. Fig.11 The figure shows the situation that two battery cells 1 connected in series are connected in parallel. The mixed connection mode of series and parallel can combine the advantages of series connection and parallel connection, can better meet the cooling demand and improve the cooling efficiency.

[0111] Please refer to Fig.12In this embodiment, in the case where the inlet 4 and the outlet 5 are opened on the top cover 7, on the other hand, along the length direction of the top cover 7, the top cover 7 is provided with a first pole 61 and a second pole 62 with opposite electrical properties at intervals; each battery cell 1 includes two inlets 4 and two outlets 5;

[0112] One of the inlets 4 and the outlet 5 is arranged close to the first pole 61 and is respectively located on both sides of the first pole 61 along the width direction of the top cover 7, which means that if one inlet 4 is located on the left side of the first pole 61 along the width direction of the top cover 7, then the corresponding outlet 5 will be located on the right side (or vice versa); the other inlet 4 and the other outlet 5 are arranged close to the second pole 62 and are respectively located on both sides of the second pole along the width direction of the top cover 7, which means that if the other inlet 4 is located on the left side of the second pole 62 along the width direction of the top cover 7, then the corresponding outlet 5 will be located on the right side (or vice versa); the two inlets 4 are located on one side of the top cover 7 along its width direction, and the two outlets 5 are located on the other side of the top cover 7 along its width direction, which means that if the two inlets 4 are located on the left side of the top cover 7 along its width direction, then the two outlets 5 are located on the right side of the top cover 7 along its width direction (or vice versa).

[0113] It should be noted that at least two inlets 4 and two outlets 5 are provided on the top cover 7, the purpose of which is to realize a dual-channel or multi-channel layout inside the battery cell 1 so that the coolant can form two or more independent cooling channels inside the battery cell. Compared with a single cooling channel, this design can not only significantly improve the cooling efficiency, but also provide a better cooling effect.

[0114] Please refer again Fig.12 , and combined with reference Fig.13 , in this embodiment, the external cooling device 3 includes an external cooling pipeline 31;

[0115] At least two battery cells 1 are connected in parallel in sequence to ensure that the current can be evenly distributed. Between two adjacent battery cells 1;

[0116] Along the parallel path of the battery cells 1, in two adjacent battery cells 1, one outlet 5 of the preceding battery cell 1 is connected to one inlet 4 of the following battery cell 1 through an external cooling pipeline 31, and the other outlet 5 of the preceding battery cell 1 is connected to the other inlet of the following battery cell 1 through another external cooling pipeline 31. Such a connection ensures that the coolant can circulate between the battery cells 1, effectively taking away the heat generated by the battery, and ensuring the stable operation of the battery module.

[0117] Please refer again Fig.13 In this embodiment, along the parallel path of the battery cells 1, in two adjacent battery cells 1, the two external cooling pipes 31 are cross-arranged, and of course, they can also be arranged in parallel.

[0118] It is understandable that the spatially parallel arrangement of two adjacent external cooling pipes 31 is a relatively traditional arrangement, and compared with the traditional spatially parallel dual-channel or multi-channel structural design, the intersecting dual-channel or multi-channel structural design can more evenly distribute the coolant on the internal surface of the battery, avoiding heat accumulation in a certain area. This allows the battery to maintain a more stable temperature during operation, improving the reliability and life of the battery.

[0119] In this embodiment, the external cooling device 3 is a conformal structure of the electrode connector 2 .

[0120] Specifically, the shape of the cooling pipe 31 is adapted to the shape of the electrode connector 2 to ensure that the cooling pipe 31 fits and covers the surface of the electrode connector 2 as closely as possible, so as to achieve the best heat dissipation effect for the electrode connector 2. For example, if the electrode connector 2 is a plate-like structure, the cooling pipe 31 is also a plate-like structure with a cooling cavity.

[0121] Although the terms such as battery cell, electrode connector, external cooling device, inlet, etc. are used more frequently in this application, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

[0122] The utility model provides a battery, comprising at least two battery cells, an electrode connector and an external cooling device. By arranging a built-in cooling device inside each battery cell, and arranging an external cooling device connected to the built-in cooling device between the outer shell of the battery cell and the electrode connector, the space between the outer shell and the electrode connector is fully utilized, thereby improving the space utilization rate without sacrificing the energy density of the battery. In addition, since the heat is directly dissipated to the inside and outside of the battery, the temperature difference between the inside and outside of the battery cell can be reduced, thereby improving the battery performance.

[0123] Embodiment 2

[0124] The utility model provides an electric device, comprising the battery provided in the above-mentioned embodiment 1.

[0125] It should be noted that the electrical device may be, for example, an electronic device, an electric vehicle or a power storage system. Among them, the electronic device may be, for example, various computers, mobile phones, display screens and other equipment that use batteries as driving power sources. The electric vehicle may be, for example, an electric car, an electric tricycle, an electric bicycle, etc. that use batteries as driving power sources. The power storage system may be, for example, a power storage system that uses batteries as power storage sources.

[0126] The electrical device provided in this embodiment has the battery provided in the first embodiment, so the heat dissipation performance, energy density and electrochemical performance of the battery in the electrical device are good.

[0127] It is understandable that the electrical device includes not only a battery for providing electrical energy, but also an object for receiving electrical energy, namely, the electrical subject. The battery is connected to the electrical subject, and the electrical subject can realize the set functions under the drive of electrical energy.

[0128] In summary, after reading this detailed disclosure, it will be apparent to those skilled in the art that the aforementioned detailed disclosure may be presented only by way of example and may not be restrictive. Although not explicitly stated herein, it will be appreciated by those skilled in the art that this application is intended to encompass various reasonable changes, improvements and modifications to the embodiments. These changes, improvements and modifications are intended to be proposed by this application and are within the spirit and scope of the exemplary embodiments of this application.

[0129] In addition, certain terms in this application have been used to describe embodiments of the present application. For example, "one embodiment", "embodiment" and / or "some embodiments" mean that a particular feature, structure or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. Therefore, it can be emphasized and should be understood that two or more references to "embodiment" or "one embodiment" or "alternative embodiment" in various parts of this specification do not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics may be appropriately combined in one or more embodiments of the present application.

[0130] It should be understood that in the foregoing description of the embodiments of the present application, in order to help understand a feature and for the purpose of simplifying the present application, the present application combines various features in a single embodiment, drawing or its description. However, this does not mean that the combination of these features is necessary. When reading the present application, it is entirely possible for a person skilled in the art to extract some of the features and understand them as separate embodiments. In other words, the embodiments in the present application can also be understood as the integration of multiple secondary embodiments. This is also true when the content of each secondary embodiment is less than all the features of a single aforementioned disclosed embodiment.

[0131] Finally, it should be understood that the embodiments of the application disclosed herein are explanations of the principles of the embodiments of the present application. Other modified embodiments are also within the scope of the present application. Therefore, the embodiments disclosed in the present application are merely examples and not limitations. Those skilled in the art can adopt alternative configurations according to the embodiments in the present application to implement the application in the present application. Therefore, the embodiments of the present application are not limited to the embodiments accurately described in the application.

Claims

1. A battery, characterized in that: It comprises at least two battery cells (1), an electrode connector (2) and an external cooling device (3); wherein: Each of the battery cells (1) comprises a shell and an electrode (6) arranged on the shell, and the electrode (6) of at least two of the battery cells (1) are electrically connected via the electrode connector (2); Each of the battery cells (1) is provided with a built-in cooling device for accommodating a cooling medium; The external cooling device (3) is arranged between the outer shell and the electrode connector (2), and is in contact with at least one of the outer shell and the electrode connector (2).

2. The battery according to claim 1, characterized in that: Each battery cell (1) is provided with an inlet (4) for the cooling medium to flow into the built-in cooling device and an outlet (5) for the cooling medium to flow out on its surface; The housing comprises a housing body and a top cover (7), wherein the top cover (7) is buckled with an opening of the housing body, the pole (6) is arranged on the top cover (7), and the inlet (4) and the outlet (5) are provided on the top cover (7) or the pole (6).

3. The battery according to claim 2, characterized in that: Along the length direction of the top cover (7), the top cover (7) is provided with a first pole (61) and a second pole (62) of opposite electrical properties at intervals, and each of the battery cells (1) comprises an inlet (4) and an outlet (5), the inlet (4) being provided on a side of the first pole (61) away from the second pole (62), and the outlet (5) being provided on a side of the second pole (62) away from the first pole (61).

4. The battery according to claim 3, characterized in that: The external cooling device (3) comprises an external cooling pipeline (31); At least two of the battery cells (1) are connected in parallel in sequence, and the internal cooling devices of each of the battery cells (1) are connected in parallel via the external cooling pipeline (31); Along the parallel path of the battery cells (1), the inlets (4) of all the battery cells (1) are connected via one external cooling pipeline (31), and the outlets (5) are connected via another external cooling pipeline (31).

5. The battery according to claim 3, characterized in that: The external cooling device (3) comprises an external cooling pipeline (31); At least two of the battery cells (1) are connected in series in sequence to form a battery unit, and the internal cooling devices of each of the battery cells (1) are connected in series via the external cooling pipeline (31); Along the series path of the battery cells (1), in two adjacent battery cells (1), the outlet (5) of the preceding battery cell (1) is connected to the inlet (4) of the succeeding battery cell (1) via an external cooling pipeline (31).

6. The battery according to claim 5, characterized in that: The battery cells are divided into at least two groups, and the battery cells in each group are sequentially connected in parallel; Along the series path of the battery cells (1) in each group of battery units, the inlet (4) of the first battery cell (1) in each group of battery units is connected in parallel via one external cooling pipeline (31), and the outlet (5) of the last battery cell (1) is connected via another external cooling pipeline (31).

7. The battery according to claim 2, characterized in that: Along the length direction of the top cover (7), the top cover (7) is provided with a first pole (61) and a second pole (62) with opposite electrical properties at intervals; each of the battery cells (1) comprises two inlets (4) and two outlets (5); One of the inlets (4) and one of the outlets (5) are arranged close to the first pole (61) and are respectively located on both sides of the first pole (61) along the width direction of the top cover (7); the other inlet (4) and the other outlet (5) are arranged close to the second pole (62) and are respectively located on both sides of the second pole along the width direction of the top cover (7); the two inlets (4) are located on one side of the top cover (7) along the width direction thereof, and the two outlets (5) are located on the other side of the top cover (7) along the width direction thereof.

8. The battery according to claim 7, characterized in that: The external cooling device (3) comprises an external cooling pipeline (31); At least two of the battery cells (1) are connected in parallel in sequence; Along the parallel path of the battery cells (1), in two adjacent battery cells (1), one of the outlets (5) of the preceding battery cell (1) is connected to one of the inlets (4) of the succeeding battery cell (1) via one of the external cooling pipelines (31), and the other of the outlets (5) of the preceding battery cell (1) is connected to the other of the inlets of the succeeding battery cell (1) via another of the external cooling pipelines (31).

9. The battery according to claim 8, characterized in that: Along the parallel path of the battery cells (1), in two adjacent battery cells (1), two external cooling pipelines (31) are cross-arranged.

10. The battery according to any one of claims 1 to 9, characterized in that: The external cooling device (3) is a conformal structure of the electrode connector (2).

11. An electrical device, characterized in that: Comprising a battery as claimed in any one of claims 1 to 10.

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