Battery pack and electric equipment

Abstract

The embodiment of the invention provides a battery pack and electric equipment, the battery pack can comprise a battery tray, battery modules and a sampling integrated structure, the battery tray comprises a bottom plate, each battery module comprises a plurality of batteries, the plurality of batteries are arranged on the bottom plate along a first direction, and each battery comprises a shell. The sampling integrated structure comprises a sampling circuit layer and a first protective layer, the sampling circuit layer is connected with the bottom plate, the first protective layer covers one side, facing the shell, of the sampling circuit layer, the sampling circuit layer is provided with a plurality of connecting ends, the connecting ends are exposed out of the first protective layer, and the connecting ends are correspondingly and electrically connected with the shell; the connection end is configured to collect an electrical signal of the battery. The battery pack assembling efficiency is high, the sampling precision is high, and the cost is low.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack and an electrical device. Background Art

[0002] In order to improve the performance, safety and service life of the battery, the battery pack is equipped with a thermal management system, which can respond and handle abnormal situations in a timely manner, and determine the battery's charge and discharge power based on the ambient temperature, battery status and power demand. The thermal management system can include a sampling system, which can collect the battery's voltage and temperature to provide necessary information for the control of electrical equipment such as vehicles.

[0003] In the related technology, the sampling system mainly includes BIC (Battery Interface Circuit), FPC (Flexible Printed Circuit) and sampling harness. Due to the large number and variety of BIC, FPC, sampling harness, etc., the assembly is time-consuming and labor-intensive, which reduces the assembly efficiency of the battery pack and makes it easy for materials to be mixed. Summary of the invention

[0004] Based on this, the embodiments of the present application provide a battery pack and an electrical device to address the deficiencies in the related art.

[0005] In a first aspect, the present application provides a battery pack, comprising:

[0006] A battery tray, the battery tray comprising a bottom plate;

[0007] At least one battery module, each battery module includes a plurality of batteries, the plurality of batteries are arranged on the bottom plate along a first direction, and the battery includes a shell;

[0008] The sampling integrated structure includes a sampling circuit layer and a first protective layer. The sampling circuit layer is connected to the bottom plate. The first protective layer covers the side of the sampling circuit layer facing the shell. The sampling circuit layer has a plurality of connection ends, which are exposed outside the first protective layer. The connection ends are electrically connected to the shell correspondingly, and the connection ends are constructed to collect electrical signals from the battery.

[0009] In a possible implementation, the sampling integrated structure also includes a plurality of temperature sampling components, which are all electrically connected to the sampling circuit layer through the first protective layer. At least one temperature sampling component is correspondingly arranged in each shell, and the temperature sampling component is constructed to obtain the temperature signal of the battery in contact with it.

[0010] In a possible implementation, the sampling integrated structure further includes at least one battery information control component, the battery information control component is arranged corresponding to the battery module, and the battery information control component is electrically connected to the sampling circuit layer.

[0011] In a possible implementation, the sampling integrated structure further includes a support plate and a second protective layer, and the first protective layer, the sampling circuit layer and the support plate are stacked in sequence.

[0012] And / or, the sampling integrated structure further includes a second protective layer, and the first protective layer, the sampling line layer and the second protective layer are stacked in sequence.

[0013] In a possible implementation, a plurality of batteries in a same battery module are sequentially connected in series along a first direction, the sampling integrated structure further includes an electrical connector, the battery further includes an electrode lead-out portion, one of the electrode lead-out portion and the housing is a positive electrode, and the other is a negative electrode;

[0014] The connection end is electrically connected to the shell in a one-to-one correspondence, the electrical connector is electrically connected to the electrode lead-out portion of the first battery among the multiple batteries, and the electrical connector is electrically connected to the sampling circuit layer.

[0015] In a possible implementation manner, the connection end is electrically connected to a surface of the housing facing the bottom plate.

[0016] In a possible implementation, the first protective layer is provided with a plurality of first windows, the first windows are arranged in one-to-one correspondence with the connection ends, and the projection of the connection end on the first protective layer is located within the first window.

[0017] In a possible implementation, the first protective layer is provided with a second window, the second window is provided in one-to-one correspondence with the temperature collecting component, and the temperature collecting component is exposed to the outside of the first protective layer through the second window.

[0018] In a possible implementation, the battery information control component is located on one side of the bottom plate in the length direction.

[0019] In a possible implementation, the battery tray further includes at least one partition beam, which is disposed in the battery tray to divide the cavity of the battery tray into a plurality of sub-cavities, each of which is used to accommodate a battery module;

[0020] The projection of the partition beam on the bottom plate covers the projection of the battery information control assembly on the bottom plate.

[0021] In a possible implementation, the partition beam includes a first partition beam and a second partition beam, the first partition beam extends along a first direction, the second partition beam extends along a second direction, and the battery information control component is located on a side of the second partition beam facing the bottom plate.

[0022] In a possible implementation, the sampling circuit layer includes a plurality of branch circuits and at least one main circuit, the main circuit extends along a first direction, and the battery information control component is electrically connected to the main circuit;

[0023] At least two branch lines are connected to both sides of the main line along the first direction, at least two branch lines are arranged along the first direction, the branch lines are arranged one by one with the batteries, and the connection end is connected to one end of the branch line away from the main line.

[0024] In a possible implementation, a first interval T is provided between two adjacent branch lines located on the same side of the main line, and the first interval T satisfies: T≥1.6 mm.

[0025] In a possible implementation, the length L1 of the branch line, the width W1 of the branch line, and the thickness H1 of the branch line satisfy: (2.83*10 -8 *L1) / (W1*H1)≤0.005;

[0026] And / or, the width W of the branch line and the thickness H of the branch line satisfy:

[0027] W1*H1≥3.2mm².

[0028] In a possible implementation, the connection end is welded to an end of the branch line away from the main line;

[0029] Alternatively, the connection end and the branch line are formed integrally.

[0030] In a possible implementation, the connection end is welded to the branch line, and the connection end and one end of the branch line close to each other at least partially overlap to form an overlapping area, and the area S of the overlapping area satisfies:

[0031] S≥30mm².

[0032] In a possible implementation, a rounded corner is formed between a bottom wall of the shell facing the bottom plate and a side wall of the shell;

[0033] The length L2 of the connection end and the width W of the connection end 2、 The thickness H2 of the battery and the radius R of the fillet satisfy: 30 / L2≤W2≤H2-2*R.

[0034] In a possible implementation manner, the support plate is located between the second protective layer and the bottom plate, and the support plate is connected to the bottom plate.

[0035] In a second aspect, the present application provides an electrical device, including an electrical device and the battery pack provided in the first aspect above, wherein the battery pack is used to supply power to the electrical device.

[0036] The embodiment of the present application provides a battery pack and an electrical device. The battery pack may include a battery tray, a battery module and a sampling integrated structure. The battery tray includes a bottom plate, the battery module includes a battery, and the battery includes a shell. The sampling integrated structure includes a sampling circuit layer and a first protective layer, and the sampling circuit layer includes a connection end. By setting a bottom plate for carrying batteries and integrating sampling integrated structures, by setting a connection end for connecting to the shell, and then obtaining the electrical signal of the battery through the connection end and the shell, and no additional sampling harness is required between the connection end and the battery, thereby simplifying the sampling integrated structure, by setting a first protective layer for insulating and protecting the sampling circuit layer, thereby avoiding the problem of short circuit caused by short circuit between the sampling circuit layer and the shell, and by connecting the sampling circuit layer to the bottom plate, the sampling circuits required for voltage and temperature sampling of the battery pack are integrated into the bottom plate, without the need to lead and route a single sampling circuit, and there is no need to use connectors to connect the sampling circuits, thereby simplifying the assembly process of the battery pack, and improving the sampling accuracy of the sampling integrated structure, and reducing the cost of the sampling integrated structure. Therefore, the battery pack provided by the embodiment of the present application has high assembly efficiency, high sampling accuracy and low cost.

[0037] In addition to the technical problems solved by the embodiments of the present application described above, the technical features that constitute the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions, other technical problems that can be solved by the battery pack and electrical equipment provided by the present application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0039] Figure 1 A schematic diagram of the structure of a battery pack provided in an embodiment of the present application;

[0040] Figure 2 for Figure 1 Schematic diagram from another angle;

[0041] Figure 3 A schematic diagram of the structure of a battery tray and a sampling integrated structure in a battery pack provided in an embodiment of the present application;

[0042] Figure 4 A schematic diagram of the structure of the sampling integrated structure in the battery pack provided in an embodiment of the present application;

[0043] Figure 5 A schematic diagram of the internal structure of the sampling integrated structure in the battery pack provided in an embodiment of the present application;

[0044] Figure 6 Another structural schematic diagram of the sampling integrated structure in the battery pack provided in the embodiment of the present application;

[0045] Figure 7 A schematic diagram of the structure of the sampling circuit layer in the battery pack provided in an embodiment of the present application;

[0046] Figure 8 A schematic diagram of the structure of a battery in a battery pack provided in an embodiment of the present application;

[0047] Fig. 9 for Figure 8 A partial enlarged view of the dotted circle in the middle.

[0048] Reference numerals:

[0049] 100-battery tray; 110-bottom plate; 120-partition beam; 121-first partition beam; 122-second partition beam; 130-cavity; 131-sub-cavity; 200-battery module; 210-battery; 211-shell; 2111-rounded corner; 212-electrode lead-out portion; 300-sampling integrated structure; 310-sampling circuit layer; 311-connecting end; 312-branch circuit; 313-main circuit; 320-first protective layer; 330-temperature sampling component; 340-battery information control component; 350-support plate.

[0050] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme in the embodiment of the present application will be described in more detail below in conjunction with the drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals throughout represent the same or similar parts or parts with the same or similar functions. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limitations on the present application. 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 the present application. The embodiments of the present application are described in detail below in conjunction with the drawings.

[0052] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0053] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are orientations or positional relationships based on 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 referred device or element 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.

[0054] The terms "first", "second", "third" (if any) in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the application described herein can be implemented in an order other than those illustrated or described herein, for example.

[0055] In addition, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product, or display comprising a series of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, method, product, or display.

[0056] In order to improve the performance, safety and service life of the battery, the battery pack is equipped with a thermal management system, which can respond and handle abnormal situations in a timely manner, and determine the battery charge and discharge power according to the ambient temperature, battery status and vehicle requirements. The thermal management system can include a sampling system, which can collect the voltage and temperature of the battery to provide necessary information for vehicle control.

[0057] In the related technology, the sampling system mainly includes BIC (Battery Interface Circuit), FPC (Flexible Printed Circuit) and sampling harness. Due to the large number and variety of BIC, FPC, sampling harness, etc., it is time-consuming and laborious to assemble, which reduces the assembly efficiency of the battery pack and the materials are easily mixed. This is because when there are multiple battery modules in the battery pack, each battery module needs to be equipped with one or more BICs, and each BIC needs to be connected through a sampling harness, which leads to a large number of BICs and sampling harnesses, which is easy to be confused and make mistakes during connection, and the sampling harnesses need to be connected through connectors, which will cause signal loss, thereby reducing the sampling accuracy.

[0058] In view of this, an embodiment of the present application provides a battery pack and an electrical device, wherein the battery pack is provided with a battery tray for carrying a battery module, and a sampling integrated structure for collecting signals for the battery module, the battery tray includes a bottom plate, the sampling integrated structure includes a sampling circuit layer and a first protective layer, the sampling circuit layer is integrated on the bottom plate of the battery tray, the battery shell is charged, the first protective layer is isolated between the sampling circuit layer and the shell, and the connection end of the sampling circuit layer is exposed outside the first protective layer, so that by connecting the bottom surface of the shell toward the bottom plate and the connection end of the sampling circuit layer, the electrical signal of the battery can be obtained through the connection end, and the battery pack does not need to perform complicated routing, thereby simplifying the assembly process of the battery pack and improving the sampling accuracy.

[0059] The specific implementation of the battery pack and the electrical equipment provided in the embodiments of the present application are described in detail below in conjunction with the accompanying drawings.

[0060] Reference Figures 1 to 8 As shown, the battery pack provided in the embodiment of the present application may include a battery tray 100, at least one battery module 200 and a sampling integrated structure 300, the battery tray 100 includes a bottom plate 110, each battery module 200 includes a plurality of batteries 210, and the plurality of batteries 210 are arranged along a first direction in the battery tray 100, and the battery 210 includes a shell 211.

[0061] The sampling integrated structure 300 includes a sampling circuit layer 310 and a first protective layer 320. The sampling circuit layer 310 is connected to the bottom plate 110. The first protective layer 320 covers the side of the sampling circuit layer 310 facing the shell 211. The sampling circuit layer 310 has a plurality of connection terminals 311. The connection terminals 311 are exposed outside the first protective layer 320. The connection terminals 311 are electrically connected to the shell 211 correspondingly. The connection terminals 311 are configured to collect electrical signals from the battery 210.

[0062] In this embodiment, the battery tray 100 is used to carry the battery module 200 . The battery tray 100 may have a cavity 130 . The battery module 200 may be accommodated in the cavity 130 . Specifically, the battery tray 100 may include a bottom plate 110 , and the bottom plate 110 constitutes the bottom wall of the cavity 130 .

[0063] A single battery pack may be provided with one or more battery modules 200, each battery module 200 may include a plurality of batteries 210, and the plurality of batteries 210 in each battery module 200 may be sequentially connected in series along a first direction. When the battery pack has a plurality of battery modules 200, the plurality of battery modules 200 may be connected in series to form a battery pack with a larger capacity. The first direction may refer to the X direction in the accompanying drawings.

[0064] The sampling integrated structure 300 is used to collect voltage signals, temperature signals, etc. of the battery 210 , and perform corresponding control according to the acquired signals, thereby facilitating control of the charging and discharging power of the battery 210 , etc., to prevent safety problems of the battery 210 .

[0065] Specifically, the sampling integrated structure 300 may include a sampling line layer 310, and the sampling line layer 310 is used to connect the battery 210 and the controller of the battery information control component 340, so that the voltage signal, temperature signal, etc. of each battery 210 can be transmitted to the controller of the battery information control component 340 through the sampling line layer 310. In addition, since the sampling line layer 310 of this embodiment has multiple sampling lines, the sampling line layer 310 as a whole can be directly integrated on the bottom plate 110 without the need to separately lead and route a single sampling line, thereby simplifying the assembly process of the battery pack.

[0066] The sampling circuit layer 310 has a connection terminal 311 corresponding to each battery 210 . The connection terminal 311 is connected to the battery 210 , and the voltage signal of the battery 210 can be obtained through the connection terminal 311 .

[0067] During production, aluminum foil or copper foil may be die-cut according to the circuit diagram to form the main body and the connection end 311 of the sampling circuit layer 310, and then the sampling circuit layer 310 is connected to the bottom plate 110 by welding or bonding. Alternatively, the connection end 311 may be provided separately, for example, the main body of the sampling circuit layer 310 may be made of aluminum foil, the connection end 311 may be made of copper sheet, and the copper sheet may be welded to the aluminum foil. This embodiment is not limited to this.

[0068] In this embodiment, since the housing 211 of the battery 210 is charged, the bottom surface of the housing 211 facing the bottom plate 110 can be connected to the sampling circuit layer 310, and no additional sampling harness is required between the housing 211 and the sampling circuit layer 310, so that the sampling circuit layer 310 and the housing 211 can be connected, thereby obtaining the voltage signal of the battery 210. Alternatively, the connection end 311 can also be electrically connected to other parts of the housing 211, for example, the side of the housing 211.

[0069] It can be understood that since the shell 211 is charged, the sampling circuit layer 310 is also charged. In addition to the connection end 311 of the sampling circuit layer 310 being connected to the shell 211, the rest of the sampling circuit layer 310 needs to be insulated and isolated from the shell 211 to avoid problems such as short circuit and leakage. Therefore, the sampling integrated structure 300 can also include a first protective layer 320, and the first protective layer 320 covers the side of the sampling circuit layer 310 facing the shell 211, so that the first protective layer 320 can protect the sampling circuit layer 310, and the connection end 311 is exposed outside the first protective layer 320, so as to facilitate each connection end 311 to be connected to the corresponding shell 211, so as to collect the corresponding electrical signal of the battery 210 through each connection end 311.

[0070] The connection end 311 can be electrically connected to the shell 211 through a conductive adhesive to improve the conductivity between the two. The conductivity of the conductive adhesive meets 35 S / m. The conductive adhesive can be mixed with metal conductive particles to improve the conductivity, such as metal particles such as aluminum, copper, and silver.

[0071] The battery pack provided in the embodiment of the present application may include a battery tray 100, a battery module 200 and a sampling integrated structure 300, wherein the battery tray 100 includes a bottom plate 110, the battery module 200 includes a battery 210, and the battery 210 includes a housing 211. The sampling integrated structure 300 includes a sampling circuit layer 310 and a first protective layer 320, and the sampling circuit layer 310 includes a connection terminal 311. By setting the bottom plate 110 for carrying the battery 210 and the integrated sampling structure 300, by setting the connection end 311 for connecting with the shell 211, the electrical signal of the battery 210 is obtained through the connection end 311 and the shell 211, and there is no need to set an additional sampling harness between the connection end 311 and the battery 210, thereby simplifying the sampling integrated structure 300, and by setting the first protective layer 320 for insulating and protecting the sampling line layer 310, thereby avoiding the short circuit and other problems caused by the short circuit between the sampling line layer 310 and the shell 211, and by connecting the sampling line layer 310 with the bottom plate 110, the sampling lines required for the pressure and temperature sampling of the battery pack are integrated into the bottom plate 110, without the need to lead and route a single sampling line, and there is no need to use connectors to connect the sampling lines, thereby simplifying the assembly process of the battery pack, improving the sampling accuracy of the sampling integrated structure 300, and reducing the cost of the sampling integrated structure 300. Therefore, the battery pack provided by the embodiment of the present application has high assembly efficiency, high sampling accuracy and low cost.

[0072] Reference Figure 4 and Figure 5 As shown, in a possible implementation, the sampling integrated structure 300 further includes a plurality of temperature sampling components 330, and the plurality of temperature sampling components 330 are all electrically connected to the sampling circuit layer 310 through the first protective layer 320, and each housing 211 is provided with at least one temperature sampling component 330, and the temperature sampling component 330 is configured to obtain the temperature signal of the battery 210 in contact with it. In other words, the position of the temperature sampling component 330 can be set according to the temperature of the battery 210, and the temperature sampling component 330 can be set corresponding to the part of the battery 210 with a higher temperature, for example, the temperature sampling component 330 can be set at one end or both ends of the length direction of the battery 210. By connecting the temperature sampling component 330 to the sampling circuit layer 310, and the temperature sampling component 330 is in thermal contact with the housing 211, the temperature signal of the battery 210 is obtained through the temperature sampling component 330, and then the temperature signal is transmitted to the controller of the battery information control component 340 through the sampling circuit layer 310, so as to monitor the temperature of the battery 210 in real time.

[0073] Exemplarily, the temperature sampling component 330 may be an NTC (Negative Temperature Coefficient) thermistor, and the internal resistance of the NTC may be less than 5 mΩ, so as to control the temperature sampling accuracy of the sampling integrated structure 300 within 1%.

[0074] Reference Figures 4 to 6 As shown, in some embodiments, the sampling integrated structure 300 further includes at least one battery information control component 340 , the battery information control component 340 is disposed corresponding to the battery module 200 , and the battery information control component 340 is electrically connected to the sampling circuit layer 310 .

[0075] It should be noted that the battery information control component 340 may include electronic devices such as microcontrollers, transformers and converters. The battery information control component 340 can be used to manage and control the battery module 200, thereby controlling the voltage and temperature of the battery module 200 within the required range to prevent safety problems from occurring in the battery module 200.

[0076] In this embodiment, the battery information control component 340, the sampling circuit layer 310 and the temperature sampling component 330 are integrated into a whole, and the battery information control component 340 is electrically connected to the sampling circuit layer 310, so that the electrical signal obtained by the connection terminal 311 and the temperature signal obtained by the temperature sampling component 330 can be transmitted to the battery information control component 340 through the sampling circuit layer 310.

[0077] The battery information control component 340 may be encapsulated in the first protection layer 320 or exposed outside the first protection layer 320 .

[0078] Reference Figure 5 As shown, in a possible implementation, the sampling integrated structure 300 also includes one of a support plate 350 and a second protective layer. When the sampling integrated structure 300 is provided with a support plate 350, the first protective layer 320, the sampling line layer 310 and the support plate 350 are stacked in sequence. When the sampling integrated structure 300 is provided with a second protective layer, the first protective layer 320, the sampling line layer 310 and the second protective layer are stacked in sequence.

[0079] Reference Figure 5 As shown, in a possible implementation, the sampling integrated structure 300 also includes a support plate 350 and a second protective layer, the first protective layer 320 , the sampling line layer 310 , the second protective layer and the support plate 350 are stacked in sequence, and the support plate 350 is connected to the bottom plate 110 .

[0080] In this arrangement, the support plate 350 can be used to carry and integrate the sampling circuit layer 310, the temperature sampling component 330 and the battery information control component 340, etc. The second protective layer can isolate the support plate 350 and the sampling circuit layer 310 to protect the sampling circuit layer 310. In this arrangement, the first protective layer 320, the sampling circuit layer 310, the second protective layer and the support plate 350 can be stacked and connected in sequence, and then the temperature sampling component 330 and the battery information control component 340 can be connected to the sampling circuit layer 310. Finally, the support plate 350 and the bottom plate 110 are welded or bonded, and the sampling integrated structure 300 is installed as a whole in the battery tray 100. This can prevent mixing of materials due to excessive materials during battery pack assembly.

[0081] In a possible implementation, the sampling integrated structure 300 further includes an electrical connector, and the battery 210 further includes an electrode lead-out portion 212 , and one of the electrode lead-out portion 212 and the housing 211 is a positive electrode, and the other is a negative electrode.

[0082] The connection end 311 is electrically connected to the housing 211 in a one-to-one correspondence, the electrical connector is electrically connected to the electrode lead-out portion 212 of the first battery 210 among the plurality of batteries 210 , and the electrical connector is electrically connected to the sampling circuit layer 310 .

[0083] It should be noted that if a connection terminal 311 is connected to a shell 211, and the shell 211 is positively charged, each connection terminal 311 can collect the positive voltage of the corresponding battery 210. According to the series connection sequence, the difference between the positive voltages of the previous battery 210 and the next battery 210 is considered to be the voltage difference of the battery module 200. In this way, each battery 210 only needs to collect a voltage signal once, and there is no need to collect the positive voltage and negative voltage of each battery 210 at the same time, which can simplify the sampling circuit of the sampling integrated structure 300. However, since each battery module 200 includes multiple batteries 210, there is no battery 210 in front of the first battery 210. Therefore, the sampling integrated structure 300 can be provided with an electrical connector, and then the electrode lead-out portion 212 of the first battery 210 and the sampling circuit layer 310 are connected through the electrical connector, so that a complete sampling circuit can be formed. In some embodiments, the first protective layer 320 is provided with a plurality of first windows, the first windows are arranged in one-to-one correspondence with the connection ends 311 , and the projection of the connection ends 311 on the first protective layer 320 is located within the first windows.

[0084] In this way, each connection terminal 311 can be exposed outside the first protective layer 320 through the corresponding first window, thereby facilitating the connection between each connection terminal 311 and the corresponding housing 211 , so that each connection terminal 311 collects the electrical signal of the corresponding battery 210 .

[0085] In some embodiments, the first protective layer 320 is provided with a second window, and the second window is provided in a one-to-one correspondence with the temperature collecting component 330 , and the temperature collecting component 330 is exposed to the outside of the first protective layer 320 through the second window.

[0086] In this way, each temperature sampling component 330 can be connected to the sampling circuit layer 310 and exposed to the outside of the first protective layer 320 through the second window, so that each temperature sampling component 330 is in thermal contact with the corresponding shell 211, which is beneficial for each temperature sampling component 330 to obtain the temperature signal of the corresponding battery 210.

[0087] In some embodiments, the battery information control component 340 is located on one side of the length direction of the bottom plate 110. The length direction of the bottom plate 110 includes the length direction of the bottom plate 110 and the width direction of the bottom plate 110. The width direction of the bottom plate 110 can refer to the X direction in the drawings, and the length direction of the bottom plate 110 can refer to the Y direction in the drawings.

[0088] Thus, when there is no free space in the middle of the battery tray 100 for arranging the battery information control assembly 340 , the battery information control assembly 340 may be disposed on one side of the length direction of the bottom plate 110 to improve the space utilization of the battery tray 100 .

[0089] Reference Figure 3 As shown, in some embodiments, the battery tray 100 further includes at least one partition beam 120, which is disposed in the battery tray 100 to partition the cavity 130 of the battery tray 100 into a plurality of sub-cavities 131, each sub-cavity 131 being used to accommodate a battery module 200. The projection of the partition beam 120 on the bottom plate 110 covers the battery information control assembly 340.

[0090] In this configuration, the partition beam 120 can divide the larger cavity 130 in the battery tray 100 into several smaller sub-cavities 131, thereby accommodating multiple battery modules 200, and the partition beam 120 can also be used for wiring and exhaust. In the above configuration, the space under the partition beam 120 can be fully utilized to set the battery information control component 340.

[0091] Reference Figure 3 As shown, in a possible implementation, the partition beam 120 includes a first partition beam 121 and a second partition beam 122, the first partition beam 121 extends along a first direction, the second partition beam 122 extends along a second direction, and the battery information control component 340 is located on the side of the second partition beam 122 facing the base plate 110.

[0092] It can be understood that the first direction can be along the left-right direction of the battery tray 100, specifically, refer to the X direction in the figure, and the second direction can be along the front-back direction of the battery tray 100, specifically, refer to the Y direction in the figure. In this way, the first partition beam 121 and the second partition beam 122 are crisscrossed to divide the cavity 130 into a plurality of sub-cavities 131, and the battery information control component 340 can be arranged below the second partition beam 122, and the second partition beam 122 can be provided with an avoidance space to avoid the various components of the battery information control component 340.

[0093] For example, when the battery information control component 340 includes components such as a transformer, since the transformer has a certain height, the height of the avoidance space can be increased by about 5 mm based on the height of the transformer to prevent the second partition beam 122 from interfering with the battery information control component 340.

[0094] Reference Figure 6 As shown, in some embodiments, the sampling circuit layer 310 includes a plurality of branch circuits 312 and at least one main circuit 313 . The main circuit 313 extends along a first direction, and the battery information control component 340 is electrically connected to the main circuit 313 .

[0095] The branch circuit 312 is connected to both sides of the main circuit 313 along the first direction. The branch circuit 312 is arranged in one-to-one correspondence with the battery 210 . The connection end 311 is located at one end of the branch circuit 312 away from the main circuit 313 .

[0096] The number of battery information control components 340 can be set according to the number of battery modules 200, for example, one battery information control component 340 is set for each battery module 200. The number of main lines 313 can be set according to the number of battery modules 200, for example, two battery modules 200 located on both sides of the second partition beam 122 can share one main line 313. The electrical signal collected by the connection terminal 311 can be transmitted to the corresponding main line 313 through the corresponding branch line 312, and then transmitted to the corresponding battery information control component 340 through the main line 313.

[0097] It can be understood that the battery 210 can also include a pole core arranged in the shell 211, the pole core includes a first pole ear and a second pole ear, the first pole ear is connected to the shell 211, and the second pole ear is connected to the electrode lead-out portion 212. The outer surface of the shell 211 can be covered with a protective film to insulate the shell 211. The protective film is provided with a third window so that part of the shell 211 is exposed outside the protective film through the third shell 211, so as to facilitate the connection end 311 to the shell 211 in the first window.

[0098] The third window may be arranged close to the first electrode ear to shorten the current transmission path and thus improve the sampling accuracy.

[0099] When the batteries 210 in the battery module 200 are arranged in sequence in positive-negative-positive-negative, since the third window of the previous battery 210 and the third window of the next battery 210 are misaligned, the branch lines 312 located on both sides of the main line 313 along the first direction can be staggered in the second direction. In this way, each connection terminal 311 collects the voltage of the shell 211 of the corresponding battery 210, and calculates the voltage through the voltage difference between the front and rear batteries 210, without collecting twice for each battery 210, that is, each battery 210 does not need to collect positive and negative voltages at the same time.

[0100] Reference Figure 7 As shown, in a possible implementation, there is a first interval T between two adjacent branch lines 312 on the same side of the main line 313, and the first interval T satisfies: T≥1.6mm. This arrangement can meet the electrical clearance requirements of the sampling line layer 310 to prevent the sampling integrated structure 300 from short circuits and other problems.

[0101] Reference Figure 7 As shown, in some embodiments, the length L1 of the branch line 312, the width W1 of the branch line 312, and the thickness H1 of the branch line 312 satisfy: (2.83*10 -8 *L1) / (W1*H1)≤0.005. In this way, the path resistance of the branch line 312 can be reduced and the path resistance of the branch line 312 can be controlled within 5 mΩ, thereby ensuring the sampling accuracy of the sampling integrated structure 300.

[0102] In some embodiments, the width W1 of the branch line 312 and the thickness H1 of the branch line 312 satisfy: W1*H1≥3.2 mm². In this way, the cross-sectional area of ​​the branch line 312 can be large enough, thereby reducing the temperature rise of the branch line 312 when transmitting signals.

[0103] In specific configuration, the length L1 of the branch line 312 , the width W1 of the branch line 312 , and the thickness H1 of the branch line 312 may be configured as required. For example, the configuration may refer to Embodiments 1 to 10 in Table 1.

[0104] Table 1 Structural parameters of branch lines

[0105]

[0106] In a possible implementation, the connection end 311 is welded to one end of the branch line 312 away from the main line 313, or the connection end 311 is integrally formed with the branch line 312. Whether welding or integrally formed, the connection end 311 and the branch line 312 can be reliably electrically connected to transmit the electrical signal collected by the connection end 311 to the battery information control component 340 through the branch line 312 and the main line 313.

[0107] In some embodiments, the connection end 311 is welded to the branch line 312, and the connection end 311 and the branch line 312 are at least partially overlapped at one end close to each other to form an overlap area, and the area S of the overlap area satisfies: S ≥ 30 mm².

[0108] It is understandable that when the area of ​​the overlapped portion between the connection end 311 and the branch line 312 is small, it will affect the welding between the connection end 311 and the branch line 312, thereby reducing the connection strength between the connection end 311 and the branch line 312. When the battery pack is vibrated, the connection end 311 and the branch line 312 are easily partially or completely disconnected, thereby affecting the sampling accuracy and even causing the sampling integrated structure 300 to be unable to sample. Therefore, in this embodiment, the area S of the overlapped area is greater than or equal to 30 mm² to improve the welding strength between the connection end 311 and the branch line 312, thereby ensuring the sampling accuracy of the sampling integrated structure 300.

[0109] Reference Figure 5 , Figure 7 and Fig. 9 As shown, in a possible implementation, a rounded corner 2111 is provided between the bottom wall of the housing 211 facing the bottom plate 110 and the side wall of the housing 211. 2、 The thickness H2 of the battery 210 and the radius R of the rounded corner 2111 satisfy: 30 / L2≤W2≤H2-2*R.

[0110] Thus, when 30 / L2≤W2, it is possible to ensure that the connection end 311 has a relatively small impedance and that there is sufficient contact area between the connection end 311 and the branch line 312 to ensure mechanical connection strength, electrical connection reliability, and electrical connection stability between the connection end 311 and the branch line 312. When W2≤H2-2*R, it is possible to effectively prevent the connection end 311 from contacting other adjacent housings 211, thereby causing a short circuit problem.

[0111] In the specific configuration, the configuration may be performed according to Embodiments 1 to 10 in Table 2, so that the length L2 of the connection end 311 and the width W of the connection end 311 are 2、 The thickness H2 of the battery 210 and the radius R of the rounded corner 2111 satisfy: 30 / L2≤W2≤H2-2*R.

[0112] Table 2 Structural parameters of connection terminals and batteries

[0113]

[0114] It is understandable that the plurality of batteries 210 may be arranged along the thickness direction thereof to form the battery module 200 , that is, the first direction may be the thickness direction of the battery 210 .

[0115] In addition, the present application also provides an electric device, including an electric device and the battery pack provided in the above embodiment, the battery pack is used to supply power to the electric device. The structure and working principle of the battery pack have been described in the above embodiment, and will not be repeated here.

[0116] For example, the electric device may be a vehicle, the electric device may be an electric motor, and the battery pack may provide electric energy to the electric motor, thereby driving the vehicle through the electric motor. The vehicle may be a pure electric vehicle, an extended-range electric vehicle, a hybrid electric vehicle, etc. The vehicle may also be any vehicle with a battery pack, which is not limited in this embodiment.

[0117] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery pack, characterized in that: include: A battery tray (100), the battery tray (100) comprising a bottom plate (110); At least one battery module (200), each battery module (200) comprising a plurality of batteries (210), the plurality of batteries (210) being arranged on the bottom plate (110) along a first direction, the battery comprising a housing (211); A sampling integrated structure (300), the sampling integrated structure (300) comprising a sampling circuit layer (310) and a first protective layer (320), the sampling circuit layer (310) being connected to the bottom plate (110), the first protective layer (320) covering a side of the sampling circuit layer (310) facing the housing (211), the sampling circuit layer (310) having a plurality of connection ends (311), the connection ends (311) being exposed outside the first protective layer (320), the connection ends (311) being electrically connected to the housing (211) correspondingly, and the connection ends (311) being configured to collect electrical signals from the battery (210).

2. The battery pack according to claim 1, characterized in that: The sampling integrated structure (300) further comprises a plurality of temperature sampling components (330), each of the plurality of temperature sampling components (330) passing through the first protective layer (320) and being electrically connected to the sampling circuit layer (310), each housing (211) being provided with at least one temperature sampling component (330), the temperature sampling component (330) being configured to obtain a temperature signal of the battery (210) in contact therewith.

3. The battery pack according to claim 1, characterized in that: The sampling integrated structure (300) further comprises at least one battery information control component (340), the battery information control component (340) being arranged corresponding to the battery module (200), and the battery information control component (340) being electrically connected to the sampling circuit layer (310).

4. The battery pack according to claim 1, characterized in that: The sampling integrated structure (300) further comprises a support plate (350), and the first protective layer (320), the sampling line layer (310) and the support plate (350) are stacked in sequence; And / or, the sampling integrated structure (300) further comprises a second protective layer, and the first protective layer (320), the sampling line layer (310), and the second protective layer are stacked in sequence.

5. The battery pack according to claim 1, characterized in that: Also included is an electrical connector, wherein a plurality of the batteries (210) in the same battery module (200) are sequentially connected in series along the first direction, and the battery (210) further includes an electrode lead-out portion (212), wherein one of the electrode lead-out portion (212) and the housing (211) is a positive electrode, and the other is a negative electrode; The connection end (311) is electrically connected to the housing (211) in a one-to-one correspondence, the electrical connector is electrically connected to the electrode lead-out portion (212) of the first battery (210) among the plurality of batteries (210), and the electrical connector is electrically connected to the sampling circuit layer (310).

6. The battery pack according to any one of claims 1 to 5, characterized in that: The connection end (311) is electrically connected to a surface of the housing (211) facing the bottom plate (110).

7. The battery pack according to any one of claims 1 to 5, characterized in that: The first protective layer (320) is provided with a plurality of first windows, the first windows being arranged in one-to-one correspondence with the connection ends (311), and the projection of the connection ends (311) on the first protective layer (320) is located within the first windows.

8. The battery pack according to claim 2, characterized in that: The first protective layer (320) is provided with a second window, the second window being arranged in a one-to-one correspondence with the temperature collecting component (330), and the temperature collecting component (330) is exposed to the outside of the first protective layer (320) through the second window.

9. The battery pack according to claim 3, characterized in that: The battery information control component (340) is located on one side of the bottom plate (110) in the length direction.

10. The battery pack according to claim 3, characterized in that: The battery tray (100) further comprises at least one partition beam (120), the partition beam (120) being arranged in the battery tray (100) so as to partition the cavity (130) of the battery tray (100) into a plurality of sub-cavities (131), each of the sub-cavities (131) being used to accommodate one of the battery modules (200); The projection of the partition beam (120) on the bottom plate (110) covers the projection of the battery information control component (340) on the bottom plate (110).

11. The battery pack according to claim 10, characterized in that: The partition beam (120) comprises a first partition beam (121) and a second partition beam (122), the first partition beam (121) extending along the first direction, the second partition beam (122) extending along the second direction, and the battery information control component (340) is located on a side of the second partition beam (122) facing the bottom plate (110).

12. The battery pack according to claim 3, characterized in that: The sampling circuit layer (310) comprises a plurality of branch circuits (312) and at least one main circuit (313), the main circuit (313) extending along the first direction, and the battery information control component (340) being electrically connected to the main circuit (313); At least two of the branch lines (312) are connected to two sides of the main line (313) along the first direction, at least two of the branch lines (312) are arranged along the first direction, the branch lines (312) and the batteries (210) are arranged in a one-to-one correspondence, and the connection end (311) is connected to an end of the branch line (312) that is away from the main line (313).

13. The battery pack according to claim 12, characterized in that: There is a first interval T between two adjacent branch lines (312) located on the same side of the main line (313), and the first interval T satisfies: T≥1.6 mm.

14. The battery pack according to claim 12, characterized in that: The length L1 of the branch line (312), the width W1 of the branch line (312), and the thickness H1 of the branch line (312) satisfy: (2.83*10 -8 *L1) / (W1*H1)≤0.005; And / or, the width W of the branch line (312) and the thickness H of the branch line (312) satisfy: W1*H1≥3.2 mm².

15. The battery pack according to claim 12, characterized in that: The connection end (311) is welded to an end of the branch line (312) that is away from the main line (313); Alternatively, the connection end (311) and the branch line (312) are integrally formed.

16. The battery pack according to claim 12, characterized in that: The connection end (311) is welded to the branch line (312), and one end of the connection end (311) and the branch line (312) close to each other at least partially overlaps to form an overlapping area, and an area S of the overlapping area satisfies: S≥30 mm².

17. The battery pack according to claim 16, characterized in that: A rounded corner (2111) is provided between the bottom wall of the shell (211) facing the bottom plate (110) and the side wall of the shell (211); The length L2 of the connecting end (311) and the width W of the connecting end (311) 2、 The thickness H2 of the battery (210) and the radius R of the rounded corner (2111) satisfy: 30 / L2≤W2≤H2-2*R.

18. The battery pack according to claim 4, characterized in that: The support plate (350) is located between the second protective layer and the bottom plate (110), and the support plate (350) is connected to the bottom plate (110).

19. An electrical equipment, characterized in that: It comprises an electric device and a battery pack as claimed in any one of claims 1 to 18, wherein the battery pack is used to supply power to the electric device.

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