Battery pack and electrical device

Abstract

A battery pack (100) and an electrical device (1000). The battery pack (100) comprises a battery module (10) and a heat exchange assembly (20). The battery module (10) comprises a plurality of battery cells (11) arranged in a first direction (F1). Each battery cell (11) extends in a second direction (F2) and an electrode lead-out part is provided at an end portion of each battery cell (11). In the second direction (F2), the battery module (10) has first side edges (12) at the end portions of the electrode lead-out parts. The first direction (F1) and the second direction (F2) are perpendicular to each other. The heat exchange assembly (20) comprises first heat exchange flow channels (21) and second heat exchange flow channels (22) which are not in communication with each other. The first heat exchange flow channels (21) exchange heat with the end portions provided with the electrode lead-out parts. Each second heat exchange flow channel (22) is located on the sides of the first heat exchange flow channels (21) away from the first side edges (12). In the second direction (F2), the length of each battery cell (11) is L, the distance between the side of each first heat exchange flow channel (21) away from the corresponding first side edge (12) and the corresponding first side edge (12) is L1, and the battery pack (100) satisfies: 0.2L≤L1.

Description

Battery packs and electrical equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number: 202323239375.7 and application date of November 28, 2023, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0003] The present application relates to the technical field of electrical devices, and in particular to a battery pack and electrical equipment. Background Art

[0004] In related technologies, batteries usually have high requirements for temperature. Working under high or low temperature conditions for a long time will reduce the battery's performance and service life. The battery is usually equipped with a temperature control component, which controls the temperature of the battery as a whole without distinction. However, in actual work, for example, when the battery pack is fast charged with a large current, the temperature rise of different parts of the battery is different. For example, the temperature at both ends of the battery is higher than that in the middle, resulting in a large temperature difference between different parts of the battery.

[0005] Application Contents

[0006] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a battery pack to improve the problem of large temperature differences between different parts of the battery pack.

[0007] According to an embodiment of the present application, a battery pack includes: a battery pack, the battery pack including a plurality of battery cells arranged along a first direction, each of the battery cells extending along a second direction and an electrode lead-out portion being provided at an end of the battery cell, and in the second direction, the end of the battery pack provided with the electrode lead-out portion has a first side, and the first direction and the second direction are arranged perpendicularly; a heat exchange component, the heat exchange component including a first heat exchange channel and a second heat exchange channel that are not connected, the first heat exchange channel heat exchange with the end provided with the electrode lead-out portion, and the second heat exchange channel is located on a side of the first heat exchange channel away from the first side, in the second direction, the length of the battery cell is L, and the distance between the side of the first heat exchange channel away from the first side and the first side is L1, and the battery pack satisfies: 0.2L≤L1.

[0008] According to the battery pack of the embodiment of the present application, by providing a first heat exchange channel at the end portion of the battery pack where the electrode lead-out portion is provided, wherein the first heat exchange channel satisfies 0.2L≤L1, the first heat exchange channel can better cover the end portion of the battery pack where the electrode lead-out portion is provided, and the heat exchange component can more specifically control the temperature of the battery pack, thereby improving the problem of large temperature difference between different parts of the battery pack.

[0009] According to the battery pack of some embodiments of the present application, the battery pack satisfies: 0.2L≤L1≤0.4L.

[0010] According to the battery pack of some embodiments of the present application, the distance between the side of the first heat exchange channel facing the first side and the first side of the battery pack is a, and a satisfies a≤25 mm.

[0011] According to the battery pack of some embodiments of the present application, a satisfies 15mm≤a≤25mm.

[0012] According to the battery pack of some embodiments of the present application, the first heat exchange channel includes a plurality of first flow channels spaced apart along the second direction, the width of the first flow channel is c, the spacing between adjacent first flow channels is d, the number of the first flow channels in the first heat exchange channel is n, and L1=nc+d+a.

[0013] According to the battery pack of some embodiments of the present application, c satisfies 40mm≤c≤70mm.

[0014] According to the battery pack of some embodiments of the present application, at least two of the first flow channels are connected to form a first series flow path, one end of the first series flow path is an inlet and the other end is an outlet.

[0015] According to the battery pack of some embodiments of the present application, the plurality of first flow channels are connected in parallel.

[0016] According to some embodiments of the present application, the battery pack further includes a heat-conducting temperature-averaging plate, which is arranged between the heat exchange component and the battery pack.

[0017] According to the battery pack of some embodiments of the present application, the edge of the temperature equalizing plate facing the first side (12) is projected on the inner side of the first side (12) of the battery pack on the side surface of the battery pack (10) facing the temperature equalizing plate.

[0018] According to the battery pack of some embodiments of the present application, the distance between the edge of the temperature vapor chamber facing the first side and the first side is b, and the distance between the side of the first heat exchange channel facing the first side and the first side of the battery pack is a, b<a.

[0019] According to the battery pack of some embodiments of the present application, b satisfies 10mm≤b≤15mm.

[0020] According to the battery pack of some embodiments of the present application, in the second direction, the battery pack has two first side edges arranged opposite to each other, and the first heat exchange channel is provided on both sides of the second heat exchange channel and between the corresponding first side edges.

[0021] According to the battery pack of some embodiments of the present application, the second heat exchange channel includes a plurality of second channels spaced apart along the second direction.

[0022] According to the battery pack of some embodiments of the present application, at least two of the second flow channels are connected to form a second series flow path, one end of the second series flow path is an inlet and the other end is an outlet; or the multiple second flow channels are connected in parallel.

[0023] According to the battery pack of some embodiments of the present application, there are multiple battery groups, and each battery group is correspondingly provided with the first heat exchange channel and the second heat exchange channel.

[0024] According to the battery pack of some embodiments of the present application, the first heat exchange channels corresponding to the multiple battery groups are connected in parallel and the second heat exchange channels are connected in parallel.

[0025] According to the battery pack of some embodiments of the present application, the heat exchange assembly includes a plurality of harmonica tubes spaced apart along the second direction, wherein a portion of the harmonica tubes defines the first heat exchange channel, and another portion of the harmonica tubes defines the second heat exchange channel.

[0026] According to the battery pack of some embodiments of the present application, the heat exchange assembly includes a flow channel plate and a substrate, the flow channel plate is provided with a flow channel groove, and the substrate covers the open opening of the flow channel groove to define the first heat exchange flow channel and the second heat exchange flow channel.

[0027] The present application also proposes an electrical device including the above-mentioned battery pack.

[0028] The present application also proposes an electrical equipment, which provides a first heat exchange channel at the end of the battery pack where the electrode lead-out portion is provided, wherein the first heat exchange channel satisfies 0.2L≤L1, so that the first heat exchange channel better covers the end of the battery pack where the electrode lead-out portion is provided, and the heat exchange component more specifically controls the temperature of the battery pack, thereby improving the problem of large temperature difference between different parts of the battery pack.

[0029] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0031] FIG1 is an exploded view of a battery pack according to an embodiment of the present application;

[0032] FIG2 is a schematic diagram of the coordination of a battery pack, a heat exchange assembly, and a temperature vapor chamber in an embodiment of the present application. Compared to the placement of the battery pack in FIG1 , the battery pack in FIG2 is in an inverted position.

[0033] FIG3 is a partial enlarged view of point I in FIG2;

[0034] FIG4 is a schematic diagram of a battery pack according to an embodiment of the present application, wherein one battery pack is hidden;

[0035] FIG5 shows experimental data when the battery pack satisfies L1 equal to 0.2L in an embodiment of the present application;

[0036] FIG6 shows experimental data when the battery pack satisfies L1 equal to 0.3L in an embodiment of the present application;

[0037] FIG7 shows experimental data when the battery pack satisfies L1 equal to 0.4L in an embodiment of the present application;

[0038] FIG8 shows the experimental data when the battery pack in the comparative example satisfies L1 equal to 0.17L;

[0039] FIG9 is a schematic diagram showing the connection relationship between the first flow channel, the second flow channel and each pipeline in an embodiment of the present application;

[0040] FIG10 is a schematic diagram of an electrical device according to an embodiment of the present application.

[0041] Figures: 1000, electrical equipment; 100, battery pack; 10, battery group; 11, battery cell; 12, first side; 20, heat exchange assembly; 21, first heat exchange channel; 211, first channel; 22, second heat exchange channel; 221, second channel; 23, first pipe; 24, second pipe; 25, first connector; 26, second connector; 231, third pipe; 2311, fourth pipe; 23111, fifth pipe; 23112, sixth pipe; 2312, seventh pipe; 23121, eighth pipe; 23122, ninth pipe; 232, tenth pipe; 2321, eleventh pipe; 23211, twelfth pipe; 23212, thirteenth pipe; 2322, fourteenth pipe; 23221, fifteenth pipe; 23222 , the sixteenth pipeline; 241, the seventeenth pipeline; 2411, the eighteenth pipeline; 24111, the nineteenth pipeline; 24112, the twentieth pipeline; 2412, the twenty-first pipeline; 24121, the twenty-second pipeline; 24122, the twenty-third pipeline; 242, the twenty-fourth pipeline; 2421, the twenty-fifth pipeline; 21211, the twenty-sixth pipeline; 24212, the twenty-seventh pipeline; 2422, the twenty-eighth pipeline; 24221, the twenty-ninth pipeline; 24222, the 30th pipeline; 30, temperature equalizing plate; F1, first direction; F2, second direction. DETAILED DESCRIPTION

[0042] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0043] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise specified, "multiple" means two or more.

[0044] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0045] The following describes a battery pack 100 according to an embodiment of the present application with reference to Figures 1 to 4, wherein the battery pack 100 is applied to an electrical device, wherein the electrical device is not limited to vehicles, and can also be any device that requires electricity, such as ships.

[0046] As shown in FIG. 1 to FIG. 3 , a battery pack 100 according to an embodiment of the present application includes a battery group 10 and a heat exchange assembly 20 .

[0047] The battery pack 10 includes a plurality of battery cells 11 stacked along a first direction F1. Each battery cell 11 extends along a second direction F2 and an electrode lead-out portion is provided at the end of the battery cell 11. In the second direction F2, the end of the battery pack 10 provided with the electrode lead-out portion has a first side 12. The first direction F1 and the second direction F2 are arranged perpendicularly.

[0048] That is, the battery pack 10 includes a plurality of battery cells 11, which are stacked in a first direction F1 and extend along a second direction F2. For example, the first direction F1 is the thickness direction of the battery cells 11, and the second direction F2 is the length direction of the battery cells 11, with the thickness direction and the length direction being perpendicular. Of course, the first direction F1 and the second direction F2 can also be other directions as long as they meet the above requirements, and will not be further described here.

[0049] The electrode lead-out portion may be a pole, a tab, or other components for leading out the electrode.

[0050] Specifically, the electrode lead-out portion may be provided on the first side edge 12 , or may be provided on several surfaces close to the first side edge 12 .

[0051] In related technologies, power batteries usually have high requirements for temperature. Working under high or low temperature conditions for a long time will reduce the performance and service life of the power battery. The power battery is usually equipped with a temperature control component, which controls the temperature of the power battery as a whole without distinction. However, in actual work, for example, when the battery pack is fast charged with a large current, the temperature rise of different parts of the power battery is different. For example, the temperature of the area where the poles are set at both ends of the power battery is higher than that of the middle part, resulting in a large temperature difference between different parts of the power battery.

[0052] The heat exchange assembly 20 includes a first heat exchange channel 21 and a second heat exchange channel 22 that are not connected. The first heat exchange channel 21 exchanges heat with the end portion provided with an electrode lead-out portion. The second heat exchange channel 22 is located on the side of the first heat exchange channel 21 that is away from the first side 12. In the second direction F2, the length of the battery cell 11 is L, and the distance between the side of the first heat exchange channel 21 that is away from the first side 13 and the first side 12 is L1. The battery pack 100 satisfies: 0.2L≤L1.

[0053] It is understood that, along the second direction, when the first heat exchange channel 21 is provided at the left end of the battery pack, L1 is the distance between the right side of the first heat exchange channel 21 and the left side of the battery pack 10. When the first heat exchange channel 21 is provided at the right end of the battery pack 10, L1 is the distance between the left side of the first heat exchange channel 21 and the right side of the battery pack 10.

[0054] The present application sets a first heat exchange channel 21 corresponding to the pole area 14, wherein the first heat exchange channel 21 satisfies 0.2L≤L1, so that the first heat exchange channel 21 better covers the end of the battery pack where the electrode lead-out portion is provided. The heat exchange component 20 controls the temperature of the battery pack 10 more specifically, thereby improving the problem of large temperature difference between different parts of the battery pack 10.

[0055] Among them, in the related art, during the operation of the battery pack, the heat generated at the end of the battery pack with the electrode lead-out part will be significantly greater than the heat generated at other parts. The present application utilizes the first heat exchange channel 21 to perform heat exchange with the end of 10 with the electrode lead-out part, and the second heat exchange channel 22 that is not connected to the first heat exchange channel 21 to perform heat exchange with other parts, thereby more specifically controlling the temperature of the end of the battery pack 10 with the electrode lead-out part, thereby improving the specificity.

[0056] Among them, 0.2L≤L1, the first heat exchange channel 21 has a certain range, which is sufficient to cover the area with higher temperature on the battery pack 10, that is, the end of the battery pack 10 with the electrode lead-out part, thereby improving the problem of large temperature difference between different parts of the battery pack 10 and further improving the temperature uniformity of the battery pack.

[0057] After a large amount of experimental data, the inventors of the present application found that in the related art, if L1 is too small, the first heat exchange channel cannot well cover the end of the battery pack with the electrode lead-out portion, and cannot effectively dissipate heat to the higher temperature area on the battery pack, resulting in a large temperature difference between different parts of the battery pack. As shown in Comparative Examples 1, 2 and 3 with reference to Figure 8, the temperature difference is generally greater than 15 degrees Celsius. In the present application, by making L1 greater than or equal to 0.2L, it is sufficient to cover the higher temperature area on the battery pack 10, and the temperature difference is generally small. As shown in Figures 5 to 7, in Examples 1 to 27 of the present application, the maximum temperature difference is 14 degrees Celsius in Example 4, and the minimum temperature difference is 1 degree Celsius in Example 19, both of which are less than the temperature difference of 15 degrees Celsius in the related art. It can be clearly seen that the present application has the effect of improving the temperature difference.

[0058] For example, L1 is 0.2L; or, L1 is 0.21L; or, L1 is 0.22L; or, L1 is 0.22L; or, L1 is 0.23L; or, L1 is 0.24L; or, L1 is 0.25L; or larger, which will not be repeated here.

[0059] According to the battery pack 100 of the embodiment of the present application, by providing a first heat exchange channel 21 corresponding to the end of the battery pack 10 where the electrode lead-out portion is provided, wherein the first heat exchange channel 21 satisfies 0.2L≤L1, so that the first heat exchange channel 21 better covers the end of the battery pack 10 where the electrode lead-out portion is provided, the heat exchange component 20 more specifically controls the temperature of the battery pack 10, thereby improving the problem of large temperature difference between different parts of the battery pack 10.

[0060] According to some embodiments of the present application, the heat exchange component 20 is connected to the air-conditioning subsystem in the vehicle's thermal management system, and utilizes the refrigerant in the air-conditioning subsystem to perform heat exchange with the battery pack 10 to adjust the temperature, wherein the air-conditioning subsystem is used to adjust the temperature in the vehicle's cabin.

[0061] According to some embodiments of the present application, 450 mm ≤ L ≤ 600 mm, and the length of the battery cell 11 is relatively short.

[0062] 5 to 8 , according to some embodiments of the present application, 0.2L≤L1≤0.4L. By setting 0.2L≤L1≤0.4L, the targeting is further improved, the temperature difference is generally smaller, and waste is avoided.

[0063] The inventors of this application have found through a large amount of experimental data that in the related art, if L1 is too large, the first heat exchange flow channel will have an excessively large impact range (for example, it will dissipate heat from other parts with low heat generation), wasting energy.

[0064] For example, for example, L1 is 0.2L; or, L1 is 0.21L; or, L1 is 0.22L; or, L1 is 0.22L; or, L1 is 0.23L; or, L1 is 0.24L; or, L1 is 0.25L; or, L1 is 0.26L; or, L1 is 0.27L; or, L1 is 0.28L; or, L1 is 0.29L; or, L1 is 0.30L; or, L1 is 0.31L; or, L1 is 0.32L; or, L1 is 0.33L; or, L1 is 0.34L; or, L1 is 0.35L; or, L1 is 0.36L; or, L1 is 0.37L; or, L1 is 0.38L; or, L1 is 0.39L; or, L1 is 0.40L.

[0065] According to some embodiments of the present application, the spacing a between the side of the first heat exchange channel 21 facing the first side 12 and the first side 12 of the battery pack 10 is set to be less than or equal to 25 mm. As shown in Figures 5 to 7, the problem of poor heat exchange effect caused by excessive distance is avoided.

[0066] According to some embodiments of the present application, a satisfies 15 mm ≤ a ≤ 25 mm. By setting a within the range of 15 to 25 mm, the first heat exchange channel 21 maintains a certain distance from the first side 12 of the battery pack 10, thereby improving structural stability while avoiding the problem of poor heat exchange effect caused by excessive distance.

[0067] Specifically, in the related art, the spacing between the first heat exchange channel and the first side of the battery pack is too small, and the distance between the first heat exchange channel and the first side of the battery pack is too small, resulting in poor overall structural stability; in the related art, referring to Example 7 and Example 8 in Figure 5, and referring to Example 16 and Example 17 in Figure 6, and referring to Example 25 and Example 26 in Figure 7, the spacing between the first heat exchange channel and the first side of the battery pack is too large, and the distance between the first heat exchange channel and the first side of the battery pack is too large, and the heat exchange effect between the first heat exchange channel and the first side of the battery pack is poor, affecting the temperature control effect.

[0068] For example, the spacing a between the first heat exchange channel 21 and the first side 12 of the battery pack 10 is 15 mm; or, the spacing a between the first heat exchange channel 21 and the first side 12 of the battery pack 10 is 16 mm; or, the spacing a between the first heat exchange channel 21 and the first side 12 of the battery pack 10 is 17 mm; or, the spacing a between the first heat exchange channel 21 and the first side 12 of the battery pack 10 is 18 mm; or, the spacing a between the first heat exchange channel 21 and the first side 12 of the battery pack 10 is 19 mm; or The spacing a between the first side edges 12 is 20 mm; or, the spacing a between the first heat exchange channel 21 and the first side edge 12 of the battery pack 10 is 21 mm; or, the spacing a between the first heat exchange channel 21 and the first side edge 12 of the battery pack 10 is 22 mm; or, the spacing a between the first heat exchange channel 21 and the first side edge 12 of the battery pack 10 is 23 mm; or, the spacing a between the first heat exchange channel 21 and the first side edge 12 of the battery pack 10 is 24 mm; or, the spacing a between the first heat exchange channel 21 and the first side edge 12 of the battery pack 10 is 25 mm.

[0069] As shown in Figures 1, 2, and 4, according to some embodiments of the present application, the first heat exchange channel 21 includes a plurality of first flow channels 211 spaced apart along the second direction F2. The width of each first flow channel 211 is c, the spacing between adjacent first flow channels 211 is d, the number of first flow channels 211 within the first heat exchange channel 21 is n, and the spacing between the first heat exchange channel 21 and the first side 12 of the battery pack 10 is a, where L1 = nc + (n-1) d + a. By specifically defining the specific structure of the first heat exchange channel 21, the plurality of first flow channels 211 are neatly arranged, resulting in a simple and orderly structure. This improves the heat exchange effect between the first heat exchange channel 21 and the end portion of the battery pack 10 where the electrode lead portion is located. Compared to the heat exchange plate body in the related art that completely covers the end portion of the battery pack where the electrode lead portion is located, the provision of a plurality of spaced apart first flow channels 211 not only ensures heat exchange effect but also reduces costs.

[0070] Among them, the first heat exchange channel 21 includes multiple first flow channels 211 spaced apart along the second direction F2, that is, the first heat exchange channel 21 may include two first flow channels 211 spaced apart along the second direction F2, or may include three first flow channels 211 spaced apart along the second direction F2, or may include more first flow channels 211 spaced apart along the second direction F2. The setting of multiple first flow channels 211 makes the temperature regulation effect of the first heat exchange channel 21 more balanced.

[0071] For example, the first heat exchange channel 21 includes two first channels 211 spaced apart along the length direction of the battery cell 11. The length direction of the battery cell 11 is the second direction F2. The width c of the two first channels 211 is 55 mm. The spacing d between the two first channels 211 is 6 mm. The number n of the first channels 211 in the first heat exchange channel 21 is 2. The spacing a between the first heat exchange channel 21 and the first side 12 of the battery pack 10 is 20 mm. L1 = nc + (n-1) d + a, that is, L1 is 136 mm. The first heat exchange channel 21 can better cover the end of the battery pack 10 where the electrode lead-out portion is provided.

[0072] According to some embodiments of the present application, c satisfies 40 mm ≤ c ≤ 70 mm. By setting a range for the width c of the first flow channel 211 and controlling the width of the first flow channel 211, energy waste is avoided while ensuring the influence range of the first flow channel 211, thereby improving the compatibility between the battery pack 10 and the heat exchange assembly 20.

[0073] Specifically, in the related art, the width c of the first flow channel is too small. The width of the first flow channel is too small, resulting in a smaller influence range of the first flow channel, which may cause temperature differences in different parts of the battery pack; in the related art, the width c of the first flow channel is too large. The width of the first flow channel is too large, which occupies a larger space, increases weight, and causes energy waste.

[0074] For example, the width c of the first flow channel 211 is 40 mm; or, the width c of the first flow channel 211 is 45 mm; or, the width c of the first flow channel 211 is 50 mm; or, the width c of the first flow channel 211 is 55 mm; or, the width c of the first flow channel 211 is 60 mm; or, the width c of the first flow channel 211 is 65 mm; or, the width c of the first flow channel 211 is 70 mm.

[0075] In some embodiments of the present application, the first flow channel 211 is defined by a harmonica heat exchange tube, that is, the first flow channel 211 includes a plurality of microchannels connected in parallel, thereby further improving the heat exchange effect.

[0076] As shown in Figures 1 and 4 , according to some embodiments of the present application, at least two first flow channels 211 are connected to form a first series flow channel, with one end of the first series flow channel being an inlet and the other end being an outlet. By providing at least two first flow channels 211 connected to form the first series flow channel, the heat exchange effect of the heat exchange medium within the first flow channels 211 is fully utilized, improving utilization. Furthermore, this reflux flow channel design reduces the number of diversions and provides better control over the flow of the heat exchange medium.

[0077] Specifically, the heat exchange medium flows through the first flow channel 211 , and at least two first flow channels 211 are connected to form a first series flow path. That is, the flow path of the heat exchange medium is longer, and the heat exchange medium and the battery pack 10 fully exchange heat.

[0078] Among them, at least two first flow channels 211 are connected to form a first series flow path, that is, two first flow channels 211 can be connected to form a first series flow path, or three first flow channels 211 can be connected to form a first series flow path, or more first flow channels 211 can be connected to form a first series flow path.

[0079] According to some embodiments of the present application, multiple first flow channels 211 are connected in parallel. By providing multiple first flow channels 211 connected in parallel, the efficiency of heat exchange is improved, and the temperature of the battery pack 10 is changed more quickly.

[0080] For example, the plurality of first flow channels 211 include a first flow channel A and a first flow channel B, the first flow channel A has an inlet and an outlet, the first flow channel B has an inlet and an outlet, the inlet of the first flow channel A and the inlet of the first flow channel B are located at the first end of the battery pack 10, and the outlet of the first flow channel A and the outlet of the first flow channel B are located at the second end of the battery pack 10 opposite to the first end.

[0081] As shown in Figures 1 to 4 , according to some embodiments of the present application, the battery pack 100 further includes a heat-conducting vapor chamber 30, which is disposed between the heat exchange assembly 20 and the battery pack 10. By disposing the vapor chamber 30 between the heat exchange assembly 20 and the battery pack 10, the vapor chamber 30 is utilized to more evenly change the temperature of the battery pack 10. Specifically, the vapor chamber 30 may be made of metal.

[0082] As shown in FIG3 , according to some embodiments of the present application, the orthographic projection of the edge of the vapor chamber 30 facing the first side 12 on the side of the battery pack 10 facing the vapor chamber 30 is located inward of the first side 12 of the battery pack 10. By positioning the orthographic projection of the edge of the vapor chamber 30 facing the first side 12 on the side of the battery pack 10 facing the vapor chamber 30 inward of the first side 12 of the battery pack 10, heat can be fully applied to the battery pack 10, improving the utilization of the heat exchange assembly 20 and avoiding energy waste.

[0083] As shown in Figure 3, according to some embodiments of the present application, the distance between the edge of the vapor chamber 30 and the first side 12 of the battery pack 10 is b, and the distance between the first heat exchange channel 21 and the first side 12 of the battery pack 10 is a, where b < a. By setting b < a, that is, the edge of the first heat exchange channel 21 is located on the inner side of the vapor chamber 30, the heat from the first heat exchange channel 21 can fully act on the vapor chamber 30, further improving the utilization rate of the heat exchange assembly 20 and avoiding energy waste.

[0084] According to some embodiments of the present application, the length of the battery cell 11 is L, the length of the temperature vapor chamber 30 is X, and X=L-2b.

[0085] According to some embodiments of the present application, b satisfies 10 mm ≤ b ≤ 15 mm. By setting 10 mm ≤ b ≤ 15 mm, a certain distance is maintained between the edge of the heat spreader 30 and the first side 12 , thereby reducing the probability of colloid overflowing onto the poles of the battery cells 11 while ensuring the affected area of ​​the heat spreader 30 .

[0086] In related art, battery cells have terminals at both ends, and battery packs typically use colloid to bond a heat spreader. As shown in Figure 4 , during assembly, the battery pack is typically positioned below the heat spreader, and the colloid between the battery pack and the heat spreader could potentially overflow onto the terminals at both ends of the battery cells. This application sets a certain distance between the edge of the heat spreader 30 and the first side 12 by setting 10mm≤b≤15mm, thereby reducing the probability of colloid overflowing onto the terminals of the battery cells 11.

[0087] For example, the spacing b between the edge of the temperature equalizing plate 30 and the first side 12 of the battery pack 10 is 10 mm; or, the spacing b between the edge of the temperature equalizing plate 30 and the first side 12 of the battery pack 10 is 11 mm; or, the spacing b between the edge of the temperature equalizing plate 30 and the first side 12 of the battery pack 10 is 12 mm; or, the spacing b between the edge of the temperature equalizing plate 30 and the first side 12 of the battery pack 10 is 13 mm; or, the spacing b between the edge of the temperature equalizing plate 30 and the first side 12 of the battery pack 10 is 14 mm; or, the spacing b between the edge of the temperature equalizing plate 30 and the first side 12 of the battery pack 10 is 15 mm.

[0088] As shown in Figures 1 and 4 , according to some embodiments of the present application, the heat exchange assembly 20 further includes a second heat exchange channel 22, which exchanges heat with a region of the battery pack 10 other than the end regions. By providing the second heat exchange channel 22 for heat exchange with a region of the battery pack 10 other than the end regions, targeted heat exchange is performed on different regions of the battery pack 10, further reducing and improving the problem of large temperature differences between different parts of the battery pack 10 and further improving the temperature uniformity of the battery pack.

[0089] Furthermore, since the first heat exchange channel 21 and the second heat exchange channel 22 are not connected, the flow rate of the heat exchange medium entering the first heat exchange channel 21 and the second heat exchange channel 22 can be adjusted independently, for example, the flow rate of the heat exchange medium in the first heat exchange channel 21 is greater than the flow rate of the heat exchange medium in the second heat exchange channel 22, thereby further improving the temperature uniformity.

[0090] As shown in Figures 1 and 4 , according to some embodiments of the present application, in the second direction F2, the battery pack 10 has two first side edges 12 disposed opposite each other, and first heat exchange channels 21 are provided on both sides of the second heat exchange channel 22 and between the corresponding first side edges 12. By providing first heat exchange channels 21 on both sides of the second heat exchange channel 22 and between the corresponding first side edges 12, with the first heat exchange channels 21 on both sides corresponding to the electrode lead portions at both ends of the battery cell 11, the problem of large temperature differences between different parts of the battery pack 10 is further reduced and improved, further improving the temperature uniformity of the battery pack.

[0091] Specifically, the distance between the edge of the temperature vaporizer 30 and the two first side edges 12 of the battery pack 10 is also b, that is, the distances between the two sides of the temperature vaporizer 30 and the two sides of the battery pack 10 are the same, and the two sides are symmetrical.

[0092] As shown in Figures 1, 2, and 4, according to some embodiments of the present application, the second heat exchange channel 22 includes a plurality of second channels 221 spaced apart along the second direction F2. By providing multiple second channels 221 spaced apart along the second direction F2, and utilizing the multiple second channels 221 to exchange heat with portions of the battery pack 10 other than the end portions, the present application fully utilizes the capacity of the heat exchange assembly 20, improving the uniformity of temperature control, compared to solutions using larger heating plates in related arts.

[0093] Among them, the second heat exchange channel 22 includes a plurality of second channels 221 spaced apart along the second direction F2, that is, the second heat exchange channel 22 may include two second channels 221 spaced apart along the second direction F2, or may include three second channels 221 spaced apart along the second direction F2, or may include more second channels 221 spaced apart along the second direction F2.

[0094] For example, the second direction F2 is the length direction of the battery cell 11, and the second heat exchange channel 22 includes two second channels 221 spaced apart along the length direction of the battery cell 11, and the two second channels 221 adjust the temperature of different parts of the battery cell 11 along the length direction; or, the second direction F2 is the length direction of the battery cell 11, and the second heat exchange channel 22 includes three second channels 221 spaced apart along the length direction of the battery cell 11, and the three second channels 221 adjust the temperature of different parts of the battery cell 11 along the length direction; or, the second direction F2 is the length direction of the battery cell 11, and the second heat exchange channel 22 includes more second channels 221 spaced apart along the length direction of the battery cell 11, and more second channels 221 adjust the temperature of different parts of the battery cell 11 along the length direction.

[0095] According to some embodiments of the present application, the width of the second flow channel 221 is the same as the width of the first flow channel 211 , and the distance between adjacent second flow channels 221 is the same as d.

[0096] Specifically, the distance between the first flow channel 211 and the second flow channel 221 is d, that is, the distance between two adjacent first flow channels 211 is equal to the distance between the first flow channel 211 and the second flow channel 221 .

[0097] In some embodiments of the present application, the second flow channel 221 may be defined by a harmonica heat exchange tube, that is, the second flow channel 221 includes a plurality of microchannels connected in parallel, thereby further improving the heat exchange effect.

[0098] As shown in Figures 1 and 4 , according to some embodiments of the present application, at least two second flow channels 221 are connected to form a second series flow path, with one end of the second series flow path being an inlet and the other end being an outlet. By providing at least two second flow channels 221 connected to form the second series flow path, the heat exchange effect of the heat exchange medium within the second flow channels 221 is fully utilized, improving utilization. Furthermore, this reflux flow channel design reduces the number of diversions and provides better control over the flow of the heat exchange medium.

[0099] Specifically, the heat exchange medium flows through the second flow channels 221 , and at least two second flow channels 221 are connected to form a first series flow path. That is, the flow path of the heat exchange medium is longer, and the heat exchange medium and the battery pack 10 fully exchange heat.

[0100] Among them, at least two second flow channels 221 are connected to form a second series flow path, that is, two second flow channels 221 can be connected in series to form a second series flow path, or three second flow channels 221 can be connected in series to form a second series flow path, or more second flow channels 221 can be connected in series to form a second series flow path.

[0101] According to other embodiments of the present application, multiple second flow channels 221 are connected in parallel. By providing multiple second flow channels 221 connected in parallel, the efficiency of heat exchange is improved, and the temperature of the battery pack 10 is changed more quickly.

[0102] For example, the plurality of second flow channels 221 include a second flow channel A and a second flow channel B, the second flow channel A has an inlet and an outlet, the second flow channel B has an inlet and an outlet, the inlet of the second flow channel A and the inlet of the second flow channel B are both located at the first end of the battery pack 10, and the outlet of the second flow channel A and the outlet of the second flow channel B are both located at the second end of the battery pack 10 opposite to the first end.

[0103] As shown in Figures 1 and 4, according to some embodiments of the present application, there are multiple battery packs 10, and each battery pack 10 is correspondingly provided with a first heat exchange channel 21 and a second heat exchange channel 22. For each battery pack 10, a first heat exchange channel 21 and a second heat exchange channel 22 are provided. The first heat exchange channel 21 exchanges heat with the end of the battery pack where the electrode lead-out portion is provided, and the second heat exchange channel 22 exchanges heat with a portion of the battery pack 10 other than the end. This allows the heat exchange component 20 to more specifically control the temperature of the battery pack 10, improve the problem of large temperature differences between different parts of the battery pack 10, improve the overall condition of the battery, and enhance the temperature uniformity of the battery.

[0104] For example, there are two battery packs 10, and each battery pack 10 is correspondingly provided with two first heat exchange channels 21 and a second heat exchange channel 22. The two first heat exchange channels 21 respectively exchange heat with the ends of the battery pack, and the second heat exchange channel 22 exchanges heat with the middle part of the battery pack 10 that is different from the ends; or, there are three battery packs 10, and each battery pack 10 is correspondingly provided with two first heat exchange channels 21 and a second heat exchange channel 22. The two first heat exchange channels 21 respectively exchange heat with the ends of the battery pack 10, and the second heat exchange channel 22 exchanges heat with the part of the battery pack 10 that is different from the ends; or, there are more battery packs 10, and each battery pack 10 is correspondingly provided with two first heat exchange channels 21 and a second heat exchange channel 22. The two first heat exchange channels 21 respectively exchange heat with the ends of the battery pack 10, and the second heat exchange channel 22 exchanges heat with the part of the battery pack 10 that is different from the ends.

[0105] As shown in Figures 1 and 4, according to some embodiments of the present application, the first heat exchange channels 21 corresponding to multiple battery packs 10 are connected in parallel, and the multiple second heat exchange channels 22 are connected in parallel. By setting the first heat exchange channels 21 corresponding to multiple battery packs 10 to be connected in parallel and the multiple second heat exchange channels 22 to be connected in parallel, compared to the solution where the first heat exchange channels 21 corresponding to multiple battery packs 10 are connected in series, the first heat exchange channels 21 corresponding to different battery packs 10 can be controlled individually, which makes the temperature adjustment of different battery packs 10 more flexible and further improves the temperature uniformity of the battery pack.

[0106] For example, there are two battery groups 10, and the two battery groups 10 include a first battery group 10 and a second battery group 10. The first battery group 10 corresponds to the first heat exchange channel A and the first heat exchange channel B, and the second battery group 10 corresponds to the first heat exchange channel C and the first heat exchange channel D. The first heat exchange channel A, the first heat exchange channel B, the first heat exchange channel C and the first heat exchange channel D are connected in parallel; the first battery group 10 corresponds to the second heat exchange channel A, and the second battery group corresponds to the second heat exchange channel B. The second heat exchange channel A and the second heat exchange channel B are connected in parallel.

[0107] According to some embodiments of the present application, the first heat exchange channels 21 corresponding to the plurality of battery packs 10 are connected in series, and the second heat exchange channels 22 are connected in series. By configuring the first heat exchange channels 21 corresponding to the plurality of battery packs 10 to be connected in series, and the second heat exchange channels 22 to be connected in series, the control method is simplified.

[0108] According to some embodiments of the present application, the heat exchange assembly 20 includes: a first heat exchange element and a second heat exchange element, the first heat exchange element is constructed as a hollow structure to define a first flow channel 211, and the second heat exchange element is constructed as a hollow structure to define a second flow channel 221.

[0109] Specifically, the first heat exchange member is a first harmonica tube, which defines a first flow channel 211 , and the second heat exchange member is a second harmonica tube, which defines a second flow channel 221 , thereby enhancing mechanical strength without sacrificing lightweight.

[0110] As shown in Figures 1 and 4, according to some embodiments of the present application, the heat exchange component 20 also includes: a first pipe 23 and a second pipe 24, the first pipe 23 is connected to the first flow channel 211 to guide the heat exchange medium to flow into or out of the first flow channel 211, and the second pipe 24 is connected to the second flow channel 221 to guide the heat exchange medium to flow into or out of the second flow channel 221.

[0111] Specifically, the first pipe 23 is configured as a first metal pipe, and the second pipe 24 is configured as a second metal pipe. For example, the first metal pipe is made of aluminum, and the second metal pipe is made of aluminum.

[0112] As shown in Figures 1 and 4 , according to some embodiments of the present application, the heat exchange assembly 20 further includes a first connector 25 and a second connector 26. The first connector 25 communicates with the first pipe 23, and the second connector 26 communicates with the second pipe 24. The first connector 25 and the second connector 26 are located on the same side of the battery pack 10. By arranging the first connector 25 and the second connector 26 on the same side of the battery pack 10, it is compatible with corresponding electrical equipment, such as vehicles where the inlet and outlet water pumps are located on the same side.

[0113] Specifically, there are multiple battery packs 10, multiple temperature vapor chambers 30 are provided in correspondence with the battery packs 10, the first connector 25 is located between two adjacent temperature vapor chambers 30, and the second connector 26 is located between two adjacent temperature vapor chambers 30, so that the amount of heat exchange medium received by the multiple battery packs 10 is more uniform. For example, there are two battery packs 10, two temperature vapor chambers 30 are provided in correspondence with the battery packs 10, the first connector 25 is located between the two temperature vapor chambers 30, and the second connector 26 is located between the two temperature vapor chambers 30.

[0114] According to other embodiments of the present application, the heat exchange assembly 20 further includes a third connector and a fourth connector. The first flow channel 211 has an inlet and an outlet, and the second flow channel 221 has an inlet and an outlet. The third connector connects the inlet of the first flow channel 211 with the inlet of the second flow channel 221, and the fourth connector connects the outlet of the first flow channel 211 with the outlet of the second flow channel 221. The third connector and the fourth connector are located on opposite sides of the battery pack 10. By arranging the third connector and the fourth connector on opposite sides of the battery pack 10, it is compatible with corresponding electrical equipment, such as a vehicle in which the inlet and outlet water pumps are located on opposite sides.

[0115] Specifically, the third joint piece is provided with a first pipe opening and a second pipe opening, the first pipe opening corresponds to the inlet connected to the first flow channel 211, and the second pipe opening corresponds to the inlet connected to the second flow channel 221. The fourth joint piece is provided with a third pipe opening and a fourth pipe opening, the third pipe opening corresponds to the outlet connected to the first flow channel 211, and the fourth pipe opening corresponds to the outlet connected to the second flow channel 221.

[0116] Specifically, there are multiple battery packs 10, multiple temperature vapor chambers 30 are provided corresponding to the battery packs 10, the third connector is located between two adjacent temperature vapor chambers 30, and the fourth connector is located between two adjacent temperature vapor chambers 30. For example, there are two battery packs 10, two temperature vapor chambers 30 are provided corresponding to the battery packs 10, the third connector is located between the two temperature vapor chambers 30, and the fourth connector is located between the two temperature vapor chambers 30.

[0117] According to some embodiments of the present application, the heat exchange assembly 20 includes a plurality of harmonica tubes spaced apart along the second direction, wherein a portion of the harmonica tubes defines a first heat exchange channel 21, and another portion of the harmonica tubes defines a second heat exchange channel 22. By defining the first heat exchange channel 21 and the second heat exchange channel 22 through the harmonica tubes, the heat exchange capacity is improved.

[0118] According to some embodiments of the present application, the heat exchange assembly 20 includes a flow channel plate and a base plate. The flow channel plate is provided with a flow channel groove, and the base plate covers the opening of the flow channel groove to define a first heat exchange flow channel 21 and a second heat exchange flow channel 22. By providing the base plate to cover the opening of the flow channel groove to define the first heat exchange flow channel 21 and the second heat exchange flow channel 23, the heat exchange capacity is improved.

[0119] The battery pack 100 according to an embodiment of the present application will be described in detail below with reference to FIG. 1 to FIG. 4 .

[0120] The battery pack 100 includes a battery group 10 , a heat exchange assembly 20 and a temperature evaporating plate 30 .

[0121] There are two battery packs 10, and the battery pack 10 includes a plurality of battery cells 11 stacked along a first direction F1. The first direction F1 is the thickness direction of the battery cell 11. Each battery cell 11 extends along a second direction F2 and an electrode lead-out portion is provided at the end of the battery cell 11. The second direction F2 is the length direction of the battery cell 11. In the second direction F2, the battery pack 10 has two first side edges 12 arranged opposite to each other, and the first direction F1 and the second direction F2 are arranged perpendicularly.

[0122] The heat exchange assembly 20 includes a first heat exchange channel 21 , a second heat exchange channel 22 , a first pipe 23 , a second pipe 24 , a first connector 25 , and a second connector 26 .

[0123] There are two first heat exchange channels 21, which correspond to the pole area 14 of the battery pack 10 and exchange heat with the end of the battery 10 where the electrode lead-out portion is provided. Each first heat exchange channel 21 includes two first channels 211 spaced apart along the second direction F2. The two first channels 211 are connected to form a first series flow path, and one end of the first series flow path is an inlet and the other end is an outlet.

[0124] The second heat exchange channel 22 is located between the two first heat exchange channels 21. The second heat exchange channel 22 exchanges heat with a portion of the battery pack 10 other than the end portions. The second heat exchange channel 22 includes four second channels 221 spaced apart along the second direction F2. Two second channels 221 are connected to form a second series flow path. One end of the second series flow path is an inlet, and the other end is an outlet. The four second channels 221 form two second series flow paths.

[0125] One end of the first pipe 23 is connected to the first connector 25, and the other end is connected to the first flow channel 211. One end of the second pipe 24 is connected to the second connector 26, and the other end is connected to the second flow channel 221. The first connector 25 and the second connector 26 are located between the two battery packs 10 and on the same side of the battery pack 10.

[0126] Among them, in the second direction F2, the length L of the battery cell 11 is 500 mm, the distance L1 between the side of the first heat exchange channel 21 facing away from the first side 12 and the first side 12 is 110 mm, the width c of the first channel 211 is 40 mm, the width of the first channel 211 is 40 mm, the spacing d between adjacent first channels 211 is 10 mm, the spacing between adjacent first channels 211 is 10 mm, the spacing between the first channel 211 and the second channel 221 is 10 mm, the number of first channels 211 in the first heat exchange channel 21 is 2, and the spacing a between the first heat exchange channel 21 and the first side 12 of the battery pack 10 is 20 mm.

[0127] Two heat evaporating plates 30 are provided, one for each battery pack 10. The heat evaporating plates 30 are positioned between the heat exchange assembly 20 and the battery pack 10 and are bonded to the battery pack 10. The edge of the heat evaporating plates 30 is located inside the battery pack 10, and the spacing b between the edge of the heat evaporating plates 30 and the first side 12 of the battery pack 10 is 10 mm.

[0128] The first flow channel 211 and the second flow channel 221 each cover different heat-generating locations in the battery pack 10. The heat exchange medium enters through the inlet of the first connector, undergoes a primary diversion through the first metal tube, and flows to the two heat spreaders 30. Then, at each heat spreader 30, it undergoes a secondary diversion to the left and right first flow channels 211. The heat exchange medium then flows back through the inner first flow channel 211 and converges, exiting through the outlet of the first connector. The heat exchange medium in the second flow channel 221 flows in the same manner as the first flow channel 211.

[0129] The first pipeline 23 includes: a third pipeline 231, a fourth pipeline 2311, a fifth pipeline 23111, a sixth pipeline 23112, a seventh pipeline 2312, an eighth pipeline 23121, a ninth pipeline 23122, a tenth pipeline 232, an eleventh pipeline 2321, a twelfth pipeline 23211, a thirteenth pipeline 23212, a fourteenth pipeline 2322, a fifteenth pipeline 23221, and a sixteenth pipeline 23222; the first connector 25 connects the third pipeline 231 and the tenth pipeline 232 respectively, the third pipeline 231 and the tenth pipeline 232 are connected in parallel, and the heat exchange medium flows toward the two battery packs 10 respectively; the third pipeline 231 connects the fourth pipeline 2311 and the seventh pipeline 2312 respectively, the fourth pipeline 2311 and the seventh pipeline 2312 are connected in parallel, and the heat exchange medium in the third pipeline 231 is divided To the fourth pipeline 2311 and the seventh pipeline 2312, the fourth pipeline 2311 is connected to the fifth pipeline 23111 and the sixth pipeline 23112 respectively, the fifth pipeline 23111 and the sixth pipeline 23112 are connected in parallel, the heat exchange medium in the fourth pipeline 233 is diverted to the fifth pipeline 23111 and the sixth pipeline 23112, the fifth pipeline 23111 is connected to the first flow channel 211, the sixth pipeline 23112 is connected to the first flow channel 211, the seventh pipeline 2312 is connected to the eighth pipeline 23121 and the ninth pipeline 23122 respectively, the eighth pipeline 23121 and the ninth pipeline 23122 are connected in parallel, the heat exchange medium in the seventh pipeline 2312 is diverted to the eighth pipeline 23121 and the ninth pipeline 23122, the eighth pipeline 23121 is connected to the first flow channel 211, and the ninth pipeline 23122 is connected to the first flow channel 211.

[0130] The tenth pipeline 232 is connected to the eleventh pipeline 2321 and the fourteenth pipeline 2322 respectively, the eleventh pipeline 2321 and the fourteenth pipeline 2322 are connected in parallel, the eleventh pipeline 2321 is connected to the twelfth pipeline 23211 and the thirteenth pipeline 23212 respectively, the twelfth pipeline 23211 and the thirteenth pipeline 23212 are connected in parallel, the twelfth pipeline 23211 is connected to the first flow channel 211, the thirteenth pipeline 23212 is connected to the first flow channel 211, and the eleventh pipeline 2321 gathers the heat exchange in the twelfth pipeline 23211 and the thirteenth pipeline 23212 The fourteenth pipe 2322 is connected to the fifteenth pipe 23221 and the sixteenth pipe 23222 respectively, the fifteenth pipe 23221 and the sixteenth pipe 23222 are connected in parallel, the fifteenth pipe 23221 is connected to the first flow channel 211, the sixteenth pipe 23222 is connected to the first flow channel 211, the fourteenth pipe 2322 gathers the heat exchange medium in the fifteenth pipe 23221 and the sixteenth pipe 23222, and finally, the tenth pipe 232 gathers the heat exchange medium in the eleventh pipe 2321 and the fourteenth pipe 2322 and discharges them side by side to the first joint 25.

[0131] The second pipe 24 includes: the seventeenth pipe 241, the eighteenth pipe 2411, the nineteenth pipe 24111, the twentieth pipe 24112, the twenty-first pipe 2412, the twenty-second pipe 24121, the twenty-third pipe 24122, the twenty-fourth pipe 242, the twenty-fifth pipe 2421, the twenty-sixth pipe 21211, the twenty-seventh pipe 24212, the twenty-eighth pipe 2422, the twenty-ninth pipe 24221, and the thirtieth pipe 24222; the second joint 26 connects the seventeenth pipe 241 and the twenty-fourth pipe 242 respectively, the seventeenth pipe 241 and the twenty-fourth pipe 242 are connected in parallel, and the heat exchange medium flows toward the two battery packs 10 respectively. The fourth pipe 241 connects the eighteenth pipe 2411 and the twenty-first pipe 2412 respectively, the eighteenth pipe 2411 and the twenty-first pipe 2412 are connected in parallel, and the heat exchange medium in the fourth pipe 241 is diverted to the In the eighteenth pipeline 2411 and the twenty-first pipeline 2412, the eighteenth pipeline 2411 is connected to the nineteenth pipeline 24111 and the twentieth pipeline 24112 respectively, and the nineteenth pipeline 24111 and the twentieth pipeline 24112 are connected in parallel. The heat exchange medium in the eighteenth pipeline 2411 is divided into the nineteenth pipeline 24111 and the twentieth pipeline 24112. The nineteenth pipeline 24111 is connected to the second flow channel 221, and the twentieth pipeline 24112 is connected to the second flow channel 221. The twenty-first pipeline 2412 is connected to the twenty-second pipeline 24121 and the twenty-third pipeline 24122 respectively, and the twenty-second pipeline 24121 and the twenty-third pipeline 24122 are connected in parallel. The heat exchange medium in the twenty-first pipeline 2412 is divided into the twenty-second pipeline 24121 and the twenty-third pipeline 24122. The twenty-second pipeline 24121 is connected to the second flow channel 221, and the twenty-third pipeline 24112 is connected to the second flow channel 221.

[0132] The twenty-fourth pipeline 242 is connected to the twenty-fifth pipeline 2421 and the twenty-eighth pipeline 2422 respectively. The twenty-fifth pipeline 2421 and the twenty-eighth pipeline 2422 are connected in parallel. The twenty-fifth pipeline 2421 is connected to the twenty-sixth pipeline 24211 and the twenty-seventh pipeline 24212 respectively. The twenty-sixth pipeline 24211 and the twenty-seventh pipeline 24212 are connected in parallel. The twenty-sixth pipeline 24211 is connected to the second flow channel 221. The twenty-seventh pipeline 24212 is connected to the second flow channel 221. The twenty-fifth pipeline 2421 converges the twenty-sixth pipeline 24211 and the twenty-seventh pipeline 24212. The heat exchange medium in the twenty-eighth pipe 24221 and the thirtieth pipe 24222 are respectively connected to the twenty-ninth pipe 24221 and the thirtieth pipe 24222, the twenty-ninth pipe 24221 and the thirtieth pipe 24222 are connected in parallel, the twenty-ninth pipe 24221 is connected to the second flow channel 221, the thirtieth pipe 24222 is connected to the second flow channel 221, the twenty-eighth pipe 2422 gathers the heat exchange medium in the twenty-ninth pipe 24221 and the thirtieth pipe 24222, and finally, the twenty-fourth pipe 242 gathers the heat exchange medium in the twenty-fifth pipe 2421 and the twenty-eighth pipe 2422 and is discharged to the second joint 26.

[0133] The first flow channel 211 and the second flow channel 221 are connected to the air-conditioning subsystem through the first connector 25 and the second connector 26. The first connector 25 and the second connector 26 are arranged at the center of the two temperature equalizing plates 30, which are suitable for vehicles with the inlet and outlet water pumps arranged on the same side. At the same time, the diversion from the connector to the two battery packs 10 can be more uniform. When the battery pack 100 needs to be cooled, the heat exchange medium in the air-conditioning subsystem flows to the inlet on the first connector 25 and the inlet on the second connector 26, which has the effect of cooling the battery pack 100. In the case of fast charging, the electrode lead-out parts at both ends of the battery cell 11 generate more heat. The system can allocate more heat exchange medium to the first flow channel 211, so that both ends of the battery pack 10 can be effectively and quickly cooled. The second flow channel 221 can be allocated less refrigerant. The distribution of heat exchange medium in the first flow channel 211 and the second flow channel 221 can be dynamically adjusted according to the heat generation of the battery pack 10.

[0134] This application offers the following advantages: It provides more targeted temperature control, alleviating the problem of large temperature differences between different parts of the battery pack 10. It allows for centralized control and management of the cooling of multiple rows of battery packs 10, allowing for flexible arrangement of flow channels and heat exchange media based on the arrangement of the battery cells 11, dynamically matching cooling power to the heat generated by the battery pack 10 in real time. The flexible combination of harmonica tubes enhances mechanical strength without sacrificing lightweight design. A reflux flow channel design reduces diversions and provides better control over the flow of the heat exchange medium.

[0135] According to an embodiment of the present application, the electric device 1000 includes the above-mentioned battery pack 100 .

[0136] The battery pack 100 supplies electric energy to the electric device 1000 . For example, if the electric device is a vehicle, the battery pack 100 provides electric energy to the vehicle.

[0137] According to the electrical equipment 1000 of the embodiment of the present application, a first heat exchange channel 21 is provided at the end of the battery pack 10 where the electrode lead-out portion is provided, wherein the first heat exchange channel 21 satisfies 0.2L≤L1, so that the first heat exchange channel 21 better covers the end of the battery pack 10 where the electrode lead-out portion is provided, and the heat exchange component 20 controls the temperature of the battery pack 10 more specifically, thereby improving the problem of large temperature difference between different parts of the battery pack 10.

[0138] Other structures and operations of the battery pack 100 according to the embodiment of the present application are known to ordinary technicians in this field and will not be described in detail here.

[0139] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0140] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery pack (100), wherein: include: A battery pack (10), the battery pack (10) comprising a plurality of battery cells (11) arranged along a first direction, each of the battery cells (11) extending along a second direction and an electrode lead-out portion being provided at an end of the battery cell (11), and in the second direction, the end of the battery pack (10) provided with the electrode lead-out portion having a first side edge (12), the first direction and the second direction being arranged perpendicularly; A heat exchange component (20), the heat exchange component (20) comprising a first heat exchange channel (21) and a second heat exchange channel (22) which are not connected, the first heat exchange channel (21) exchanging heat with an end portion provided with the electrode lead-out portion, the second heat exchange channel (22) being located on a side of the first heat exchange channel (21) facing away from the first side (12), in the second direction, the length of the battery cell (11) is L, the distance between the side of the first heat exchange channel (21) facing away from the first side (12) and the first side (12) is L1, and the battery pack (100) satisfies: 0.2L≤L1.

2. The battery pack (100) according to claim 1, wherein: The battery pack (100) satisfies: 0.2L≤L1≤0.4L.

3. The battery pack (100) according to claim 1 or 2, wherein: The distance between the side of the first heat exchange channel (21) facing the first side edge (12) and the first side edge (12) of the battery pack (10) is a, and a satisfies a≤25 mm.

4. The battery pack (100) according to claim 3, wherein: The a satisfies 15mm≤a≤25mm.

5. The battery pack (100) according to claim 3 or 4, wherein: The first heat exchange channel (21) comprises a plurality of first channels (211) spaced apart along the second direction, the width of the first channel (211) is c, the spacing between adjacent first channels (211) is d, the number of the first channels (211) in the first heat exchange channel (21) is n, and L1=nc+(n-1)d+a.

6. The battery pack (100) according to claim 5, wherein: The c satisfies 40mm≤c≤70mm.

7. The battery pack (100) according to claim 5 or 6, wherein: At least two of the first flow channels (211) are connected to form a first series flow path, one end of the first series flow path is an inlet and the other end is an outlet.

8. The battery pack (100) according to claim 5 or 6, wherein: The plurality of first flow channels (211) are connected in parallel.

9. The battery pack (100) according to any one of claims 1 to 8, wherein: It also includes a heat-conducting temperature-averaging plate (30), wherein the temperature-averaging plate (30) is arranged between the heat exchange component (20) and the battery pack (10).

10. The battery pack (100) according to claim 9, wherein: The orthographic projection of the edge of the temperature homogenizing plate (30) facing the first side edge (12) on the surface of the battery pack (10) facing the temperature homogenizing plate (30) is located on the inner side of the first side edge (12) of the battery pack (10).

11. The battery pack (100) according to claim 10, wherein: The distance between the edge of the temperature homogenizing plate (30) facing the first side (12) and the first side (12) is b, and the distance between the side of the first heat exchange channel (21) facing the first side (12) and the first side (12) of the battery pack (10) is a, b<a.

12. The battery pack (100) according to claim 11, wherein: The b satisfies 10mm≤b≤15mm.

13. The battery pack (100) according to any one of claims 1 to 12, wherein: In the second direction, the battery pack (100) has two first side edges (12) arranged opposite to each other, and the first heat exchange flow channels (21) are provided on both sides of the second heat exchange flow channel (22) and between the corresponding first side edges (12).

14. The battery pack (100) according to any one of claims 1 to 13, wherein: The second heat exchange flow channel (22) comprises a plurality of second flow channels (221) arranged at intervals along the second direction.

15. The battery pack (100) according to claim 14, wherein: At least two of the second flow channels (221) are connected to form a second series flow path, one end of the second series flow path is an inlet and the other end is an outlet; or The plurality of second flow channels (221) are connected in parallel.

16. The battery pack (100) according to any one of claims 1 to 15, wherein: There are a plurality of battery packs (10), and each of the battery packs (10) is correspondingly provided with the first heat exchange channel (21) and the second heat exchange channel (22).

17. The battery pack (100) according to claim 16, wherein: The first heat exchange channels (21) corresponding to a plurality of the battery packs (10) are connected in parallel, and the second heat exchange channels (22) are connected in parallel.

18. The battery pack (100) according to any one of claims 1 to 17, wherein: The heat exchange component (20) comprises a plurality of harmonica tubes spaced apart along the second direction, wherein a portion of the harmonica tubes define the first heat exchange flow channel (21), and another portion of the harmonica tubes define the second heat exchange flow channel (22).

19. The battery pack (100) according to any one of claims 1 to 17, wherein: The heat exchange assembly (20) comprises a flow channel plate and a base plate, the flow channel plate being provided with a flow channel groove, and the base plate covering an open opening of the flow channel groove to define the first heat exchange flow channel (21) and the second heat exchange flow channel (22).

20. An electrical device (1000), wherein: Comprising a battery pack (100) according to any one of claims 1 to 19.

Images