Battery cell, battery cell group, battery pack and energy storage system

Abstract

The utility model discloses a battery cell, a battery pack and an energy storage system. The battery cell comprises a battery cell main body and a heat exchange runner, wherein the heat exchange flow channel comprises a main flow channel and a branch flow channel; a main runner is arranged on the side surface of the battery cell main body and covers at least part of the side surface; at least two side surfaces of the battery cell main body are provided with branch flow channels, first ports and second ports of the branch flow channels are communicated with the main flow channel, the branch flow channels cover at least part of the side surfaces where the branch flow channels are located, and at least part of the main flow channel is located on the side surfaces where the branch flow channels are located. In the battery cell provided by the invention, the main flow channel of the heat exchange flow channel is arranged on the side surface of the battery cell main body, the branch flow channels of the heat exchange flow channel are arranged on at least two side surfaces of the battery cell main body, the main flow channel covers at least part of the side surface where the main flow channel is located, and the branch flow channels cover at least part of the side surface where the branch flow channels are located. At least two side surfaces of the battery cell main body can be subjected to heat exchange through the main flow channels and the branch flow channels, so that the heat exchange area is increased, and the heat exchange efficiency of the battery cell is improved.

Description

Technical Field

[0001] This application relates to the field of thermal management technology for energy storage systems, and more specifically, to a battery cell, a battery cell pack, a battery pack, and an energy storage system. Background Technology

[0002] Energy storage systems that use batteries for energy storage are widely used on both the grid and user sides. Thermal management of energy storage systems is a key factor in ensuring their performance, lifespan, and safety.

[0003] In related technologies, liquid cooling is mainly used for thermal management of battery cells, but the heat exchange efficiency of this thermal management method still needs to be improved. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a battery cell, a battery cell pack, a battery pack, and an energy storage system to improve the heat exchange efficiency of the battery cell.

[0005] To achieve the above objectives, this application discloses the following technical solution:

[0006] In a first aspect, this application provides a battery cell, which includes: a battery cell body and a heat exchange channel;

[0007] The heat exchange channel includes a main channel and branch channels;

[0008] The main channel is provided on the side of the battery cell body, and the main channel covers at least a portion of the side on which it is located.

[0009] The battery cell body has branch channels on at least two sides, and the first and second ports of the branch channels are connected to the main channel. The branch channels cover at least a portion of the side on which they are located.

[0010] At least a portion of the main channel is located on the side where the tributary channel is located.

[0011] Optionally, the opposing sides of the battery cell body include a first side and a second side, and both the first side and the second side are provided with the branch channel.

[0012] Optionally, the two adjacent sides of the battery cell body include a first side and a side adjacent to the first side, and the two adjacent sides are provided with the branch channel;

[0013] Alternatively, the two adjacent sides of the battery cell body include a second side and a side adjacent to the second side, and the two adjacent sides are provided with the branch channel;

[0014] Alternatively, one set of adjacent sides in the cell body includes a first side and a side adjacent to the first side, and another set of adjacent sides in the cell body includes a second side and a side adjacent to the second side. Each set of adjacent sides is provided with the branch channel, and the first side and the second side are distributed opposite to each other.

[0015] Optionally, in the case where one set of adjacent sides includes a first side and a side adjacent to the first side, and another set of adjacent sides includes a second side and a side adjacent to the second side, the side adjacent to the first side in one set of adjacent sides and the side adjacent to the second side in the other set of adjacent sides are relatively distributed.

[0016] Optionally, the tributary channels on the adjacent two side faces are connected to the same main channel.

[0017] Optionally, the main channel includes: a main channel part one and a main channel part two connected to the main channel part one;

[0018] There is an included angle between the first part of the main channel and the second part of the main channel;

[0019] Of the two adjacent sides, one side is provided with the first part of the main channel and the other side is provided with the second part of the main channel;

[0020] Of the two adjacent sides, one part of the main channel and the branch channel are connected, and the other part of the main channel and the branch channel are connected.

[0021] Optionally, one of the two adjacent sides may be provided with the main channel.

[0022] Optionally, the opposing sides of the battery cell body include a first side and a second side;

[0023] The main channel includes a first main channel and a second main channel, with at least a portion of the first main channel disposed on the first side and at least a portion of the second main channel disposed on the second side.

[0024] At least one of the branch channels is a first branch channel, and the first port and the second port of the first branch channel are both connected to the first main channel; at least one of the branch channels is a second branch channel, and the first port and the second port of the second branch channel are both connected to the second main channel.

[0025] Optionally, the first main flow channel and the second main flow channel are connected in parallel between the heat exchange inlet and the heat exchange outlet of the heat exchange channel.

[0026] Optionally, the cell body has a bottom side and a top side in the vertical direction; of the heat exchange inlet and the heat exchange outlet, one is located on the bottom side and the other is located on the top side.

[0027] Optionally, the heat exchange inlet is used to communicate with the first heat exchange plate, and the heat exchange outlet is used to communicate with the second heat exchange plate. The first heat exchange plate and the heat exchange inlet are located on one side of the cell body in the vertical direction, and the second heat exchange plate and the heat exchange outlet are located on the other side of the cell body in the vertical direction.

[0028] Optionally, the tab side of the battery cell body is the top side; or, the tab side of the battery cell body is located between the top side and the bottom side.

[0029] Optionally, the first main flow channel and the second main flow channel are connected in series between the heat exchange inlet and the heat exchange outlet of the heat exchange channel, and the first main flow channel and the second main flow channel are connected through an intermediate flow channel.

[0030] Optionally, the side where the intermediate flow channel is located is adjacent to the first side and also adjacent to the second side.

[0031] Optionally, the heat exchange inlet and heat exchange outlet of the heat exchange channel are both located on the bottom or top side of the cell body in the vertical direction.

[0032] Optionally, both the heat exchange inlet and the heat exchange outlet are used to communicate with the third heat exchange plate, and the heat exchange inlet, the heat exchange outlet and the third heat exchange plate are located on one side of the cell body in the vertical direction.

[0033] Optionally, the tab side of the battery cell body is the top side of the battery cell body; or, the tab side of the battery cell body is located between the top side and the bottom side.

[0034] Optionally, the battery cell further includes a housing, and the battery cell body is located inside the housing;

[0035] The heat exchange channel is located inside the housing and between the housing and the battery cell body; or the heat exchange channel is located outside the housing.

[0036] In the battery cell provided in this application, a main heat exchange channel is provided on the side of the battery cell body, and branch heat exchange channels are provided on at least two sides of the battery cell body. The main channel covers at least a portion of the side on which it is located, and the branch channels cover at least a portion of the side on which they are located. At least a portion of the main channel is located on the side where the branch channels are located. In this way, heat can be exchanged on at least two sides of the battery cell body through the main channel and the branch channels, which increases the heat exchange area and improves the heat exchange efficiency of the battery cell. Moreover, the fact that at least a portion of the main channel is located on the side where the branch channels are located facilitates the connection between the branch channels and the main channel, thereby reducing the flow resistance of the heat exchange medium in the heat exchange channels and improving the heat exchange efficiency.

[0037] Secondly, this application provides another type of battery cell, which includes: a battery cell body and a heat exchange channel;

[0038] The heat exchange channel includes a main channel and branch channels;

[0039] The main channel is provided on at least two sides of the battery cell body, and the main channel covers at least a portion of the side on which it is located.

[0040] The battery cell body has branch channels on at least two sides, and the first and second ports of the branch channels are connected to the main channel. The branch channels cover at least a portion of the side on which they are located.

[0041] The main channel and the tributary channels are located on different sides.

[0042] Optionally, the opposing sides of the battery cell body include a first side and a second side, and both the first side and the second side are provided with the branch channel.

[0043] Optionally, the adjacent two sides of the battery cell body include a first side and a third side, and both the first side and the third side are provided with the branch channel;

[0044] And / or, two adjacent sides of the battery cell body include a second side and a third side, and both the second side and the third side are provided with the branch channel;

[0045] Wherein, when the cell body has the first side and the second side, the first side and the second side are distributed relative to each other.

[0046] Optionally, the main channel includes a first main channel and a second main channel, with at least a portion of the first main channel and at least a portion of the second main channel located on opposite sides.

[0047] The first port of the tributary is connected to the first main channel, and the second port of the tributary is connected to the second main channel.

[0048] Optionally, the first main channel includes a main channel section 1 and a main channel section 2 connected to the main channel section 1, wherein the side where the main channel section 1 is located and the side where the main channel section 2 is located are adjacent.

[0049] The second main channel includes a main channel three-section and a main channel four-section connected to the main channel three-section, wherein the side where the main channel three-section is located and the side where the main channel four-section is located are adjacent;

[0050] Among them, the side where the first section of the main channel is located and the side where the fourth section of the main channel is located are the same side, and the side where the second section of the main channel is located and the side where the third section of the main channel is located are opposite to each other.

[0051] Optionally, when the first side and the second side of the battery cell body are opposite each other and both are provided with the branch channel, the branch channel located on the first side is the first branch channel, and the branch channel located on the second side is the second branch channel.

[0052] The first port of the first branch channel is connected to the main channel in one segment, and the second port of the first branch channel is connected to the main channel in four segments.

[0053] The first port of the second branch channel is connected to the main channel in two sections, and the second port of the second branch channel is connected to the main channel in three sections.

[0054] Optionally, the heat exchange channel further includes a branch channel, which is located on the side where the first section and the fourth section of the main channel are located. The branch channel covers the portion of its side and is located between the first port and the second port of the first branch channel, and is connected in series with the first branch channel.

[0055] Optionally, one of the heat exchange inlet and the heat exchange outlet of the heat exchange channel is located in the first section of the main channel and the other is located in the fourth section of the main channel; both the heat exchange inlet and the heat exchange outlet are located on the bottom side or top side of the cell body in the vertical direction.

[0056] Optionally, the heat exchange inlet and the heat exchange outlet are used to communicate with the fourth heat exchange plate, and the heat exchange inlet, the heat exchange outlet and the fourth heat exchange plate are located on one side of the cell body in the vertical direction.

[0057] Optionally, the tab side of the battery cell body is located between the top side and the bottom side; or, the tab side of the battery cell body is the top side of the battery cell body.

[0058] Optionally, the battery cell further includes a housing, and the battery cell body is located inside the housing;

[0059] The heat exchange channel is located inside the housing and between the housing and the battery cell body; or the heat exchange channel is located outside the housing.

[0060] In the battery cell provided in this application, at least two sides of the battery cell body are provided with main heat exchange channels and at least two sides of the battery cell body are provided with secondary heat exchange channels. The main heat exchange channels cover at least a portion of the side on which they are located, and the secondary heat exchange channels cover at least a portion of the side on which they are located. The main heat exchange channels and the secondary heat exchange channels are located on different sides. In this way, heat can be exchanged on at least four sides of the battery cell body through the main heat exchange channels and the secondary heat exchange channels, thereby increasing the heat exchange area and improving the heat exchange efficiency of the battery cell.

[0061] Thirdly, this application also provides a battery cell assembly, which includes the battery cells described in any of the above claims;

[0062] The battery cell has tabs on its side, and there are at least two battery cells. The tabs of two adjacent battery cells are adjacent to each other, and the tabs of two adjacent battery cells are electrically connected by a connector. A portion of the heat exchange channel and a portion of the connector overlap and are thermally connected on the tab sides.

[0063] Fourthly, this application also provides a battery pack, which includes: the above-mentioned cell group; or, includes a heat exchange plate and any of the above-mentioned cells, wherein the heat exchange inlet and heat exchange outlet of the heat exchange channel are both connected to the heat exchange plate.

[0064] Optionally, both the heat exchange inlet and the heat exchange outlet protrude from the surface of the battery cell, and the heat exchange plate is provided with a connection port, with both the heat exchange inlet and the heat exchange outlet communicating with the connection port.

[0065] Fifthly, this application also provides an energy storage system, which includes the battery pack described in any of the above claims. Attached Figure Description

[0066] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0067] Figure 1 This is a schematic diagram of the external structure of a battery cell provided in Embodiment 1 of this application;

[0068] Figure 2 This is a schematic diagram of the internal structure of the battery cell provided in Embodiment 1 of this application;

[0069] Figure 3 A schematic diagram of another external structure of the battery cell provided in Embodiment 1 of this application;

[0070] Figure 4 This is a schematic diagram of a first structure of the heat exchange channel in a battery cell provided in Embodiment 1 of this application;

[0071] Figure 5 for Figure 4 The diagram shows the structure of the heat exchange channel and the main body of the battery cell;

[0072] Figure 6 for Figure 4 A schematic diagram of the heat exchange channel and the main body of the battery cell from another direction;

[0073] Figure 7 This is a schematic diagram of the structure of the battery cell and heat exchange plate provided in Embodiment 1 of this application;

[0074] Figure 8 This is an assembly diagram of the battery cell and heat exchange plate provided in Embodiment 1 of this application;

[0075] Figure 9 This is a schematic diagram of the battery cell assembly provided in Embodiment 1 of this application;

[0076] Figure 10 This is a schematic diagram of a second structure of the heat exchange channel in the battery cell provided in Embodiment 1 of this application;

[0077] Figure 11 for Figure 10 The diagram shows the structure of the heat exchange channel and the main body of the battery cell;

[0078] Figure 12 for Figure 10 A schematic diagram of the heat exchange channel and the main body of the battery cell from another direction;

[0079] Figure 13 This is a schematic diagram of a third structure of the heat exchange channel in the battery cell provided in Embodiment 1 of this application;

[0080] Figure 14 for Figure 13 The diagram shows the structure of the heat exchange channel and the main body of the battery cell;

[0081] Figure 15 for Figure 13 A schematic diagram of the heat exchange channel and the main body of the battery cell from another direction;

[0082] Figure 16 This is another structural schematic diagram of the battery cell assembly provided in Embodiment 1 of this application;

[0083] Figure 17This is a schematic diagram of the fifth structure of the heat exchange channel in the battery cell provided in Embodiment 1 of this application;

[0084] Figure 18 for Figure 17 The diagram shows the structure of the heat exchange channel and the main body of the battery cell;

[0085] Figure 19 for Figure 17 A schematic diagram of the heat exchange channel and the main body of the battery cell from another direction;

[0086] Figure 20 Another assembly diagram of the battery cell and heat exchange plate provided in Embodiment 1 of this application;

[0087] Figure 21 This is a schematic diagram of the sixth structure of the heat exchange channel in the battery cell provided in Embodiment 1 of this application;

[0088] Figure 22 for Figure 21 The diagram shows the structure of the heat exchange channel and the main body of the battery cell;

[0089] Figure 23 for Figure 21 A schematic diagram of the heat exchange channel and the main body of the battery cell from another direction;

[0090] Figure 24 Another assembly diagram of the battery cell and heat exchange plate provided in Embodiment 1 of this application;

[0091] Figure 25 This is a schematic diagram of the external structure of the battery cell provided in Embodiment 2 of this application;

[0092] Figure 26 This is a schematic diagram of the internal structure of the battery cell provided in Embodiment 2 of this application;

[0093] Figure 27 This is a schematic diagram of the first structure of the heat exchange channel in the battery cell provided in Embodiment 2 of this application;

[0094] Figure 28 for Figure 27 The diagram shows the structure of the heat exchange channel and the main body of the battery cell;

[0095] Figure 29 for Figure 27 A schematic diagram of the heat exchange channel and the main body of the battery cell from another direction;

[0096] Figure 30 This is a schematic diagram of the second structure of the heat exchange channel in the battery cell provided in Embodiment 2 of this application;

[0097] Figure 31 for Figure 30 The diagram shows the structure of the heat exchange channel and the main body of the battery cell;

[0098] Figure 32 for Figure 30 A schematic diagram of the heat exchange channel and the main body of the battery cell from another direction;

[0099] Figure 33 This is a schematic diagram of a third structure of the heat exchange channel in the battery cell provided in Embodiment 2 of this application;

[0100] Figure 34 for Figure 33 The diagram shows the structure of the heat exchange channel and the main body of the battery cell;

[0101] Figure 35 This is an assembly diagram of the battery cell and heat exchange plate provided in Embodiment 2 of this application.

[0102] Explanation of reference numerals in the attached figures:

[0103] 100 - Battery cell, 200 - Heat exchange plate, 200a - First heat exchange plate, 200b - Second heat exchange plate, 200c - Third heat exchange plate, 201 - Connection port, 300 - Connector;

[0104] 1-Shell;

[0105] 2 is the main body of the battery cell, 2a-first side, 2b-second side, 2c-bottom side, 2d-top side, 2e-third side, 21-first side, 22-second side, 23-third side, 24-fourth side, 25-fifth side, 26-tab side, 27-tab, 27a-positive tab, 27b-negative tab;

[0106] 3-Heat exchange channel, 31-Heat exchange inlet, 32-Heat exchange outlet; 33-Main channel, 33a-First main channel, 33b-Second main channel, 331-Main channel section 1, 332-Main channel section 2, 333-Third port, 334-Fourth port; 335-Main channel section 1, 336-Main channel section 2, 337-Main channel section 3, 338-Main channel section 4; 34-Branch channel, 34a-First branch channel, 34b-Second branch channel, 34c-Third branch channel, 341-First port, 342-Second port; 35-Inlet channel, 35a-First inlet channel, 35b-Second inlet channel; 36-Outlet channel, 36a-First outlet channel, 36b-Second outlet channel; 37-Intermediate channel; 38-Branch channel. Detailed Implementation

[0107] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0108] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. The terminology used in the following embodiments is for the purpose of describing specific embodiments only and is not intended to be a limitation of this application. As used in the specification and appended claims of this application, the singular expressions "a," "an," "the," "the," "the," and "this" are intended to also include expressions such as "one or more," unless the context clearly indicates otherwise. It should also be understood that in the embodiments of this application, "one or more" refers to one, two, or more; "and / or" describes the relationship between related objects, indicating that three relationships may exist; for example, A and / or B can represent: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0109] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0110] The "multiple" mentioned in the embodiments of this application refers to two or more. It should be noted that in the description of the embodiments of this application, terms such as "first" and "second" are used only for the purpose of distinguishing descriptions and should not be construed as indicating or implying relative importance, nor should they be construed as indicating or implying order.

[0111] The terms "parallel" and "perpendicular" used in this application refer to "basically parallel" and "basically perpendicular" in practical operation. "Basically parallel" can be understood as parallelism with a certain degree of error, and similarly, "basically perpendicular" can be understood as perpendicularity with a certain degree of error.

[0112] In related technologies, energy storage systems use liquid cooling for thermal management of battery cells. Specifically, a liquid cooling plate is placed on one side of the battery cell. This concentrates the cooling capacity of the liquid cooling plate on one side of the battery cell, allowing temperature regulation only on that side, resulting in low heat exchange efficiency.

[0113] To improve the heat exchange efficiency of battery cells, embodiments of this application provide a battery cell, a battery cell pack, a battery pack, and an energy storage system.

[0114] The following two embodiments illustrate the battery cell, battery cell pack, battery pack, and energy storage system provided in this application.

[0115] Example 1 of this application

[0116] Figures 1-24 The battery cell provided in Embodiment 1 of this application is shown.

[0117] like Figure 1 and Figure 2 As shown, the battery cell 100 provided in Embodiment 1 of this application includes: a housing 1, a battery cell body 2, and a heat exchange channel 3.

[0118] The housing 1 is the outer housing of the battery cell 100. The housing 1 can be rectangular, cylindrical or other shapes.

[0119] The main body of the battery cell 2 is located inside the casing 1.

[0120] The cell body 2 includes a separator, an electrolyte, a positive electrode, and a negative electrode; wherein the separator separates the positive and negative electrodes. In the case of a multi-layered separator, the outermost separator can also form the inner shell of the cell, which is the outer shell of the cell body 2. The cell body 2 can be a wound cell structure or a laminated cell structure.

[0121] The battery cell body 2 can be rectangular, cylindrical, or other shapes, and the shape of the battery cell body 2 is adapted to the shell 1. When the battery cell body 2 is circular, it has three sides; when it is rectangular, it has six sides.

[0122] The battery cell body 2 also has tabs 27, which include a positive tab 27a and a negative tab 27b. The positive tab 27a is connected to the positive terminal of the battery cell body 2, and the negative tab 27b is connected to the negative terminal of the battery cell body 2. Both the positive tab 27a and the negative tab 27b extend to the outside of the housing 1 to facilitate wiring.

[0123] The heat exchange channel 3 is used for the flow of heat exchange medium and for heat exchange with the battery cell body 2. The heat exchange channel 3 has a heat exchange inlet 31 and a heat exchange outlet 32 ​​to ensure that the heat exchange medium enters the heat exchange channel 3 from the heat exchange inlet 31 and flows out of the heat exchange channel 3 from the heat exchange outlet 32.

[0124] It should be noted that when the battery cell body 2 needs to dissipate heat, the heat exchange channel 3 and the battery cell body 2 exchange heat to cool the battery cell body 2; when the battery cell body 2 needs to be heated, the heat exchange channel 3 and the battery cell body 2 exchange heat to heat the battery cell body 2.

[0125] The heat exchange channel 3 can be a pipe bending structure with internal flow channels, or a plate structure with internal flow channels. The heat exchange channel 3 can be a one-piece molded structure or a structure formed by assembling multiple components.

[0126] In some embodiments, refer to Figure 2 The heat exchange channel 3 is located inside the housing 1, between the housing 1 and the cell body 2. The heat exchange channel 3 can directly contact the diaphragm of the cell 100 for heat exchange, enabling cell-level heat exchange (heat dissipation and heating). This brings the heat exchange channel 3 closer to the heat-generating component of the cell 100 (cell body 2), eliminating the need for the housing 1 in the heat exchange path, effectively shortening the heat exchange path and improving the heat exchange efficiency of the cell 100. In the cell 100 provided by this application, the heat exchange channel 3 improves the heat exchange efficiency of the cell 100, ensuring that the temperature of the cell 100 remains within a set range, thus extending the lifespan of the cell 100.

[0127] It should be noted that in the above embodiments, the battery cell 100 may not include the casing 1.

[0128] To facilitate heat exchange between the heat exchange channel 3 and the battery cell body 2, the heat exchange channel 3 can be attached to the battery cell body 2. Specifically, the heat exchange channel 3 and the battery cell body 2 can be in direct contact; this can be understood as the heat exchange channel 3 being attached to the surface of the battery cell body 2. Alternatively, a thermally conductive layer can be provided between the heat exchange channel 3 and the battery cell body 2, with the heat exchange channel 3 attached to the surface of the battery cell body 2 through this thermally conductive layer. To simplify installation, the heat exchange channel 3 can be attached to the surface of the battery cell body 2 using a thermally conductive adhesive layer, which serves both thermal conductivity and fixation purposes.

[0129] In other embodiments, reference is made to Figure 3 The heat exchange channel 3 can be located outside the housing 1. In this way, the heat exchange channel 3 can exchange heat with the heat-generating part of the battery cell body 2 through the housing 1. Since the heat exchange channel 3 is located outside the housing 1, the setting of the heat exchange channel 3 is simplified, and the assembly of the entire battery cell 100 is simplified.

[0130] The heat exchange channel 3 can be disposed on the shell 1. For example, the heat exchange channel 3 can be attached to the surface of the shell 1 so that the heat exchange channel 3 and the shell 1 can exchange heat. The attachment method of the heat exchange channel 3 can be referred to the previous text, and will not be repeated here.

[0131] The specific structure of heat exchange channel 3 is described below.

[0132] like Figure 4 As shown, the heat exchange channel 3 includes a main channel 33 and a branch channel 34.

[0133] The branch channel 34 can be a square flat tube or other types of heat exchange tube, or the main channel 33 can be a plate structure with a flow channel.

[0134] Both the first port 341 and the second port 342 of the branch channel 34 are connected to the main channel 33. It is understood that the first port 341 and the second port 342 of a single branch channel 34 are connected to the same main channel 33. The first port 341 can be referred to as the inlet of the branch channel 34, and the second port 342 can be referred to as the outlet of the branch channel 34; alternatively, the first port 341 can be referred to as the outlet of the branch channel 34, and the second port 342 can be referred to as the inlet of the branch channel 34. To facilitate the connection of both the first port 341 and the second port 342 of the branch channel 34 to the main channel 33, the branch channel 34 can be selected to be U-shaped, serpentine, or other shapes.

[0135] The main flow channel 33 can be a square flat tube or other types of heat exchange tubes, or the main flow channel 33 can also be a plate structure with flow channels.

[0136] The heat exchange inlet 31 and heat exchange outlet 32 ​​of heat exchange channel 3 can be connected to the main channel 33. The first port 341 of the branch channel 34 is connected to the heat exchange inlet 31 through the main channel 33, and the second port 342 of the branch channel 34 is connected to the heat exchange outlet 32 ​​through the main channel 33. In this way, the heat exchange medium can enter the branch channel 34 through the main channel 33, and the heat exchange medium flowing through the branch channel 34 can flow back to the main channel 33. The main channel 33 plays a role in diverting and converging the flow, which can reduce the number of heat exchange inlets 31 and heat exchange outlets 32 and simplify the heat exchange channel 3.

[0137] The main flow channel 33 is indirectly connected to the heat exchange inlet 31 via the inlet flow channel 35, and indirectly connected to the heat exchange outlet 32 ​​via the outlet flow channel 36. In this case, the heat exchange inlet 31 can be located in the inlet flow channel 35, and the outlet flow channel 36 can be located in the outlet flow channel 36. Figure 4 and Figure 5 As shown, both the inlet channel 35 and the outlet channel 36 are located on the side of the cell body 2, with the inlet channel 35 covering at least a portion of the side it is located on, and the outlet channel 36 covering at least a portion of the side it is located on. In this way, the inlet channel 35 and the outlet channel 36 increase the heat exchange area of ​​the heat exchange channel 3 and improve the heat exchange efficiency of the cell 100.

[0138] The specific locations of the inlet channel 35 and the outlet channel 36 are selected according to the actual situation. Both the inlet channel 35 and the outlet channel 36 can be square flat tubes or other types of heat exchange tubes, or the inlet channel 35 and the outlet channel 36 can also be plate structures with channels. This application does not limit this in Embodiment 1.

[0139] In practice, such as Figure 17 As shown, both the main flow channel 33 and the branch flow channel 34 are directly connected to the heat exchange inlet 31, and both the main flow channel 33 and the branch flow channel 34 are directly connected to the heat exchange outlet 32; or, as Figure 21 As shown, the main channel 33 can also be directly connected to the heat exchange inlet 31, and the main channel 33 can also be directly connected to the heat exchange outlet 32.

[0140] For example, such as Figure 17 As shown, the main flow channels include a first main flow channel 33a and a second main flow channel 33b. The first main flow channel 33a has a third port 333 and a fourth port 334. A heat exchange inlet 31 is located in the first main flow channel 33a, between the third port 333 and the fourth port 334. In this case, both the third port 333 and the fourth port 334 are outlets of the first main flow channel 33a, and the heat exchange inlet 31 serves as the inlet of the first main flow channel 33a. Of course, the heat exchange inlet 31 can also be located at the third port 333. The second main flow channel 33b has a third port 333 and a fourth port 334. A heat exchange outlet 32 ​​is located in the second main flow channel 33b, between the third port 333 and the fourth port 334. In this case, both the third port 333 and the fourth port 334 are inlets of the second main flow channel 33b, and the heat exchange outlet 32 ​​serves as the outlet of the second main flow channel 33b. Of course, the heat exchange outlet 32 ​​can also be located at the fourth port 334.

[0141] In the above structure, the outlet (fourth port 334) of the first main channel 33a is connected through the first outlet channel 36a, the second main channel 33b and the heat exchange outlet 32, and the inlet (third port 333) of the second main channel 33b is connected through the second inlet channel 35b, the first main channel 33a and the heat exchange inlet 31.

[0142] In practice, at least one of the heat exchange inlet 31 and heat exchange outlet 32 ​​can also be set on the branch channel 34, and is not limited to the above structure.

[0143] continue Figure 4 and Figure 5 As shown, a main channel 33 is provided on the side of the battery cell body 2, and the main channel 33 covers at least a portion of the side on which it is located.

[0144] For example, the battery cell body 2 includes a first surface 21, a second surface 22, a third surface 23, a fourth surface 24, a fifth surface 25, and a tab side surface 26. The tab side surface 26 is provided with the tab 27 mentioned earlier. The first surface 21 and the second surface 22 are distributed opposite each other along a first direction, the third surface 23 and the fourth surface 24 are distributed opposite each other along a second direction, and the fifth surface 25 and the tab side surface 26 are distributed opposite each other along a third direction. The first direction, the second direction, and the third direction are perpendicular to each other. It should be noted that "opposite distribution" means face-to-face distribution, which can also be understood as: the two oppositely distributed surfaces face each other.

[0145] In the aforementioned cell body 2, the third surface 23, the fourth surface 24, the fifth surface 25, and the tab side 26 are all adjacent to the first surface 21; the third surface 23, the fourth surface 24, the fifth surface 25, and the tab side 26 are all adjacent to the second surface 22; the first surface 21, the second surface 22, the fifth surface 25, and the tab side 26 are all adjacent to the third surface 23; the first surface 21, the second surface 22, the fifth surface 25, and the tab side 26 are all adjacent to the fourth surface 24; the first surface 21, the second surface 22, the third surface 23, and the fourth surface 24 are all adjacent to the fifth surface 25; and the first surface 21, the second surface 22, the third surface 23, and the fourth surface 24 are all adjacent to the tab side 26. The first surface 21, the second surface 22, the third surface 23, the fourth surface 24, the fifth surface 25, and the tab side 26 can all be referred to as the sides of the cell body 2.

[0146] like Figure 4 As shown, both the first surface 21 and the third surface 23 of the battery cell body 2 are provided with a main channel 33, which covers a portion of the first surface 21 and the third surface 23; as Figure 5 As shown, the second side 22 and the fourth side 24 of the battery cell body 2 are both provided with a main channel 33, which covers a portion of the second side 22 and the fourth side 24.

[0147] In Embodiment 1 of this application, branch channels 34 are provided on at least two sides of the battery cell body 2, and the branch channels 34 cover at least a portion of the side on which they are located. In this way, the branch channels 34 can be set according to the temperature of different sides of the battery cell body 2 or the heat exchange requirements of different sides, thereby improving the flexibility of the arrangement of the heat exchange channels 3.

[0148] For example, such as Figure 4 As shown, the first surface 21 is provided with a branch channel; as Figure 5 As shown, the second side 22 is provided with a branch channel 34, so that both sides of the battery cell body 2 are provided with branch channels 34.

[0149] For example, such as Figure 14 As shown, both the first surface 21 and the third surface 23 are provided with branch channels; as Figure 15As shown, both the second side 22 and the fourth side 24 are provided with branch channels 34, so that all four sides of the battery cell body 2 are provided with branch channels 34.

[0150] In practice, the first side 21 and the third side 23 are provided with branch channels, and the second side 22 or the fourth side 24 is provided with branch channels 34, so that the three sides of the battery cell body 2 are provided with branch channels 34.

[0151] In practice, branch channels 34 can be provided on all five or six sides of the battery cell body 2, but this application embodiment does not limit this.

[0152] In Embodiment 1 of this application, there can be one or more branch channels 34 located on the same side. The more branch channels 34 there are, the larger the area through which the flow passes through the main body 2 of the battery cell, which is beneficial to improving the heat exchange efficiency of the battery cell 100.

[0153] When there are two or more branch channels 34 located on the same side, such as Figure 4 and Figure 5 As shown, all branch channels 34 located on the same side can be connected to the same main channel 33. In this case, all branch channels 34 located on the same side are arranged in parallel. The more branch channels 34 there are, the more beneficial it is to shorten the length of each branch channel 34 and the more beneficial it is to improve the temperature uniformity of the cell 100.

[0154] To improve the temperature uniformity of the battery cell 100, other structures can also be used. Specifically, the side where the inlet channel 35 is located, mentioned earlier, is adjacent to the side where the branch channel 34 is located, and the side where the outlet channel 36 is located, mentioned earlier, is adjacent to the side where the branch channel 34 is located.

[0155] For example, such as Figure 4 and Figure 5 As shown, the inlet channel 35 is located on the fifth surface 25; the outlet channel 36 is located on the side surface 26 of the electrode tab; the first surface 21 and the second surface 22, which are provided with the branch channels 34, are both adjacent to the fifth surface 25; and the first surface 21 and the second surface 22, which are provided with the branch channels 34, are both adjacent to the side surface 26 of the electrode tab.

[0156] To facilitate the arrangement of the main flow channel 33 and the branch flow channel 34 on the side, the main flow channel 33 covers a portion of the side it is located on, and the branch flow channel 34 covers a portion of the side it is located on. Alternatively, the entire side of the main flow channel 33 can be covered by the main flow channel 33, and the entire side of the branch flow channel 34 can be covered by the branch flow channel 34. This effectively increases the heat exchange area of ​​the main flow channel 33 and the branch flow channel 34, thereby improving the heat exchange efficiency.

[0157] In Embodiment 1 of this application, at least a portion of the main flow channel 33 is located on the side where the branch flow channel 34 is located. Thus, the portion of the main flow channel 33 that is on the same side as the branch flow channel 34 can communicate with the branch flow channel 34. This connection between the main flow channel 33 and the branch flow channel 34 is located on the side, facilitating communication between them, reducing the flow resistance of the heat exchange medium, and simplifying the production and manufacturing of the heat exchange channel 3.

[0158] For example, such as Figure 4 and Figure 5 As shown, both the first surface 21 and the second surface 22 are provided with branch channels 34, and the main channel 33 is located on the first surface 21, the third surface 23, the second surface 22, and the fourth surface 24. This can be understood as follows: part of the main channel 33 is located on the first surface 21 where the branch channels 34 are located, and part of the main channel 33 is located on the second surface 22 where the branch channels 34 are located. Specifically, the portion of the main channel 33 on the first surface 21 is connected to the branch channel 34 on the first surface 21, and the portion of the main channel 33 on the second surface 22 is also connected to the branch channel 34 on the second surface 22. Of course, the main channel 33 can also be located on both the first surface 21 and the second surface 22, so that the entire main channel 33 is located on the side where the branch channels 34 are located.

[0159] In the battery cell 100 provided in Embodiment 1 of this application, a main channel 33 of a heat exchange channel 3 is provided on the side of the battery cell body 2, and a branch channel 34 of the heat exchange channel 3 is provided on at least two sides of the battery cell body 2. The main channel 33 covers at least a portion of the side on which it is located, and the branch channel 34 covers at least a portion of the side on which it is located. At least a portion of the main channel 33 is located on the side on which the branch channel 34 is located. In this way, heat exchange can be carried out on at least two sides of the battery cell body 2 through the main channel 33 and the branch channel 34, which increases the heat exchange area and improves the heat exchange efficiency of the battery cell 100. Moreover, since at least a portion of the main channel 33 is located on the side on which the branch channel 34 is located, it is convenient for the branch channel 34 and the main channel 33 to be connected, thereby reducing the flow resistance of the heat exchange medium, which is beneficial to improving the heat exchange efficiency, and also facilitates the production and manufacturing of the heat exchange channel 3.

[0160] In the first embodiment of this application, at least two sides on which the branch channel 34 is provided may include opposite sides.

[0161] In some embodiments, such as Figure 4 and Figure 5 As shown, the opposing sides of the battery cell body 2 include a first side 2a and a second side 2b. Both the first side 2a and the second side 2b are provided with a heat exchange channel 34. The first side 21 mentioned above is the first side 2a, and the second side 22 mentioned above is the second side 2b. In this way, the heat exchange channel 3 can exchange heat at least on the opposing sides of the battery cell body 2, improving the temperature uniformity of the battery cell body 2, thereby improving the temperature uniformity of the entire battery cell 100.

[0162] In practice, the third surface 23 mentioned above can be the first side surface 2a, and the fourth surface 24 mentioned above can be the second side surface 2b; or, the fifth surface 25 mentioned above can be the first side surface 2a, and the tab side surface 26 mentioned above can be the second side surface 2b; or, both the first surface 21 and the third surface 23 mentioned above can be the first side surface 2a, and both the second surface 22 and the fourth surface 24 mentioned above can be the second side surface 2b; or, both the first surface 21 and the fourth surface 24 mentioned above can be the first side surface 2a, and both the second surface 22 and the third surface 23 mentioned above can be the second side surface 2b; or Alternatively, the first surface 21 and the fifth surface 25 mentioned above can both be the first side surface 2a, and the second surface 22 and the tab side surface 26 mentioned above can both be the second side surface 2b; or, the first surface 21 and the tab side surface 26 mentioned above can both be the first side surface 2a, and the second surface 22 and the fifth surface 25 mentioned above can both be the second side surface 2b; or, the fifth surface 25 and the third surface 23 can both be the first side surface 2a, and the tab side surface 26 and the fourth surface 24 can both be the second side surface 2b; or, the fifth surface 25 and the fourth surface 24 can both be the first side surface 2a, and the tab side surface 26 and the third surface 23 can both be the second side surface 2b.

[0163] In practice, at least two sides with branch channels 34 may also include adjacent sides.

[0164] In some embodiments, such as Figure 11 and Figure 12 As shown, the battery cell body 2 has two adjacent sides, including a second side 2b and a side adjacent to the second side 2b. Both adjacent sides are provided with branch channels 34. This facilitates the arrangement of the branch channels 34.

[0165] For example, the second side 22 of the cell body 2 is the second side 2b, and the second side 22 and the fourth side 24 are both provided with a branch channel 34, or the second side 22 and the third side 23 are both provided with a branch channel 34, or the second side 22 and the fifth side 25 are both provided with a branch channel 34, or the second side 22 and the tab side 26 are both provided with a branch channel 34.

[0166] In some other embodiments, the adjacent sides of the cell body 2 include a first side 2a and a side adjacent to the first side 2a, and both adjacent sides are provided with branch channels 34. This facilitates the arrangement of the branch channels 34.

[0167] For example, the first side 21 of the battery cell body 2 can also be the second side 2b. The first side 21 and the fourth side 24 are both provided with branch channels 34, or the first side 21 and the third side 23 are both provided with branch channels 34, or the first side 21 and the fifth side 25 are both provided with branch channels 34, or the first side 21 and the tab side 26 are both provided with branch channels 34.

[0168] In some other embodiments, such as Figure 14 and Figure 15 As shown, one set of adjacent sides of the battery cell body 2 includes a first side 2a and a side adjacent to the first side 2a. Another set of adjacent sides of the battery cell body 2 includes a second side 2b and a side adjacent to the second side 2b. Each set of adjacent sides is provided with a branch channel 34, and the first side 2a and the second side 2b are distributed opposite to each other. In this way, heat exchange can be achieved on at least four sides of the battery cell body 2, which effectively improves the heat exchange efficiency. Moreover, since the first side 2a and the second side 2b are distributed opposite to each other, the heat exchange channel 3 can exchange heat between the opposite two sides of the battery cell body 2, which improves the temperature uniformity of the battery cell body 2.

[0169] In the above structure, one side adjacent to the first side 2a in one set of adjacent sides and one side adjacent to the second side 2b in another set of adjacent sides are relatively distributed, which can further improve the temperature uniformity of the battery cell body 2; moreover, it realizes the combination of branch channels 34 on both adjacent sides and branch channels 34 on both opposite sides.

[0170] For example, such as Figure 14 and Figure 15 As shown, in the battery cell body 2, both the first surface 21 and the second surface 22 facing each other are provided with branch channels 34, the third surface 23 adjacent to the first surface 21 is provided with a branch channel 34, and the fourth surface 24 adjacent to the second surface 22 is provided with a branch channel 34. This structure can also be understood as follows: in the battery cell body 2, both the first surface 21 and the second surface 22 facing each other are provided with branch channels 34, and both the third surface 23 and the fourth surface 24 facing each other are provided with branch channels 34.

[0171] For example, such as Figure 18 and Figure 19 As shown, the first surface 21 and the second surface 22 of the battery cell body 2 are provided with branch channels 34, the third surface 23 adjacent to the first surface 21 is provided with branch channels 34, and the fourth surface 24 adjacent to the second surface 22 is provided with branch channels 34.

[0172] For example, such as Figure 22 and Figure 23As shown, the first surface 21 and the second surface 22 of the battery cell body 2 are provided with branch channels 34, the third surface 23 adjacent to the first surface 21 is provided with branch channels 34, and the fourth surface 24 adjacent to the second surface 22 is provided with branch channels 34.

[0173] In the above structure, one side adjacent to the first side 2a in one pair of adjacent sides and one side adjacent to the second side 2b in another pair of adjacent sides can also be adjacent, and are not limited to this. Figure 14 and Figure 15 The distribution structure shown.

[0174] In the case where branch channels 34 are provided on both adjacent sides, in order to reduce the number of main channels 33 and simplify the structure of heat exchange channels 3, the branch channels 34 on adjacent side surfaces are connected to the same main channel 33.

[0175] For example, such as Figures 10-12 As shown, the branch channel 34 located on the second face 22 and the branch channel 34 on the fourth face 24 are connected to the same main channel 33.

[0176] For example, such as Figures 13-15 As shown, the branch channel 34 located on the first face 21 and the branch channel 34 located on the third face 23 are connected to the same main channel 33 (first main channel 33a), and the branch channel 34 located on the second face 22 and the branch channel 34 located on the fourth face 24 are connected to the same main channel 33 (second main channel 33b).

[0177] To facilitate the connection between the branch channels 34 on adjacent side surfaces and the same main channel 33, the main channel 33 may include: a main channel part 331 and a main channel part 332 connected to the main channel part 331; wherein, the main channel part 331 and the main channel part 332 have an included angle; on adjacent side surfaces, one side is provided with the main channel part 331 and the other side is provided with the main channel part 332; on adjacent side surfaces, the main channel part 331 on one side is connected to the branch channel 34, and the main channel part 332 on the other side is connected to the branch channel 34.

[0178] For example, such as Figure 11 As shown, both the adjacent second surface 22 and the fourth surface 24 are provided with branch channels 34. The first part of the main channel 331 is located on the second surface 22, and the second part of the main channel 332 is located on the fourth surface 24. The first part of the main channel 331 of the second surface 22 is connected to the branch channel 34, and the second part of the main channel 332 of the fourth surface 24 is connected to the branch channel 34.

[0179] For example, such as Figure 14As shown, both the adjacent first surface 21 and third surface 23 are provided with branch channels 34. The first main channel 33a, with its main channel portion 331 located on the first surface 21, and its main channel portion 332 located on the third surface 23, are connected. The first main channel portion 331 of the first surface 21 is connected to the branch channel 34, and the first main channel portion 331 of the third surface 23 is also connected to the branch channel 34. Figure 15 As shown, both the adjacent second surface 22 and fourth surface 24 are provided with branch channels 34. The first part 331 of the main channel 33b is located on the second surface 22, and the second part 332 of the main channel 33b is located on the fourth surface 24. The first part 331 of the main channel 33b of the second surface 22 is connected to the branch channel 34, and the first part 331 of the main channel 33b of the fourth surface 24 is connected to the branch channel 34. Figure 18 and Figure 19 This structure is also shown. Figure 22 and Figure 23 This structure is also shown.

[0180] Because there is an angle between the main channel part 331 and the main channel part 332, the main channel 33, which includes the main channel part 331 and the main channel part 332, has a bent structure. The main channel part 331 and the main channel part 332 can be an integral structure or a separate structure.

[0181] The structure of the main channel 33 allows the connection between the branch channel 34 and the main channel 33 to be located on the side where the branch channel 34 is located, which facilitates the connection between the branch channel 34 and the main channel 33 and also facilitates the production and manufacturing of the heat exchange channel 3. The structure of the main channel 33 also enables the main channel 33 and the battery cell body 2 to be matched in a limiting manner, which facilitates the installation of the heat exchange channel 3.

[0182] In practice, the main channel 33 can also be connected to the branch channels 34 on adjacent side surfaces through other structures. In some embodiments, one of the adjacent side surfaces is provided with the main channel 33.

[0183] On one hand, the two adjacent sides include a first side 2a and a side adjacent to the first side 2a. The main channel 33 is located on the first side 2a, or the main channel 33 is located on a side adjacent to the first side 2a. For example, both the first side 21 and the third side 23 are provided with branch channels 34. The main channel 33 can be located on the first side 21. The connection between the main channel 33 and the branch channel 34 located on the first side 21 is located on the first side 21. The connection between the main channel 33 and the branch channel 34 located on the third side 23 is located at the side edge between the third side 23 and the first side 21.

[0184] On the other hand, the two adjacent sides include the second side 2b and a side adjacent to the second side 2b. The main channel 33 is located on the second side 2b, or the main channel 33 is located on a side adjacent to the second side 2b. For example, both the second side 22 and the fourth side 24 are provided with branch channels 34. The main channel 33 can be located on the second side 22. The connection between the main channel 33 and the branch channel 34 located on the second side 22 is located on the second side 22. The connection between the main channel 33 and the branch channel 34 located on the fourth side 24 is located at the side edge between the fourth side 24 and the second side 22.

[0185] In practice, the branch channels 34 on adjacent side surfaces can also be connected to different main channels 33. For example, the adjacent side surfaces include a first surface 21 and a third surface 23. Both the first surface 21 and the third surface 23 are provided with branch channels 34. The branch channel 34 on the first surface 21 is connected to a main channel 33, and the branch channel on the third surface 23 is connected to another main channel 33. These two main channels 33 are connected in parallel between the heat exchange inlet 31 and the heat exchange outlet 32.

[0186] The distribution of tributary channel 34 has been explained above; the distribution of main channel 33 will be explained below.

[0187] like Figure 4 and Figure 5 As shown, the main channel 33 includes a first main channel 33a and a second main channel 33b. A portion of the first main channel 33a is disposed on the first side 2a, and a portion of the second main channel 33b is disposed on the second side 2b. The first side 2a and the second side 2b are distributed opposite to each other. At least one branch channel is a first branch channel 34a, and both the first port 341 and the second port 342 of the first branch channel 34a are connected to the first main channel 33a. At least one branch channel is a second branch channel 34b, and both the first port 341 and the second port 342 of the second branch channel 34b are connected to the second main channel 33b.

[0188] It should be noted that when the main channel 33 includes a main channel part 331 and a main channel part 332, the first main channel 33a may include a main channel part 331 and a main channel part 332, and the second main channel 33b may also include a main channel part 331 and a main channel part 332.

[0189] In the above structure, the position of the first branch channel 34a is affected by the position of the first main channel 33a, but not by the position of the second main channel 33b, which facilitates the placement of the first branch channel 34a on the cell body 2; the position of the second branch channel 34b is affected by the position of the second main channel 33b, but not by the position of the first main channel 33a, which facilitates the placement of the second branch channel 34b on the cell body 2; moreover, both the first main channel 33a and the second main channel 33b play the roles of diverting and converging currents. By adjusting the position of the first main channel 33a, the position of the first branch channel 34a can be adjusted, and by adjusting the position of the second main channel 33b, the position of the second branch channel 34b can be adjusted, which improves the flexibility of arranging the branch channels 34.

[0190] It should be noted that the above structure enables the first port 341 and the second port 342 of a single branch channel 34 to be connected to the same main channel 33.

[0191] like Figure 4 As shown, the first main flow channel 33a and the second main flow channel 33b are connected in parallel between the heat exchange inlet 31 and the heat exchange outlet 32 ​​of the heat exchange channel 3. This can be understood as follows: the inlet of the first main flow channel 33a and the inlet of the second main flow channel 33b are both connected to the heat exchange inlet 31, and the outlet of the first main flow channel 33a and the outlet of the second main flow channel 33b are both connected to the heat exchange outlet 32. In this way, the temperature difference between the heat exchange medium flowing through the first main flow channel 33a and the heat exchange medium flowing through the second main flow channel 33b is small, and the temperature difference between the heat exchange medium flowing through the first branch channel 34a and the heat exchange medium flowing through the second branch channel 34b is also small. This reduces the temperature difference between the first side 2a and the second side 2b, improves the temperature uniformity of the battery cell body 2, and further improves the temperature uniformity of the entire battery cell 100.

[0192] For example, such as Figure 4 As shown, the inlet of the first mainstream channel 33a can be connected to the heat exchange inlet 31 through the first inlet channel 35a, and the outlet of the first mainstream channel 33a can be connected to the heat exchange outlet 32 ​​through the first outlet channel 36a. The inlet of the second mainstream channel 33b can be connected to the heat exchange inlet 31 through the second inlet channel 35b, and the outlet of the second mainstream channel 33b can be connected to the heat exchange outlet 32 ​​through the second outlet channel 36b.

[0193] Since the first main flow channel 33a and the second main flow channel 33b are connected in parallel, in order to simplify the structure of the heat exchange channel 3, the heat exchange inlet 31 and the heat exchange outlet 32 ​​can be located on different sides of the cell body 2, with the side where the heat exchange inlet 31 is located and the side where the heat exchange outlet 32 ​​is located being relatively distributed.

[0194] In some embodiments, such as Figure 8As shown, the battery cell body 2 has a bottom side 2c and a top side 2d in the vertical direction, which can be any of the three directions mentioned above. The heat exchange inlet 31 is located on the bottom side 2c, and the heat exchange outlet 32 ​​is located on the top side 2d. This reduces the flow velocity of the heat exchange medium within the heat exchange channel 3, ensuring sufficient heat exchange between the heat exchange medium and the battery cell body 2, thus improving heat exchange efficiency.

[0195] It should be noted that the battery cell body 2 has a bottom side 2c and a top side 2d in the vertical direction. This can be understood as the battery cell 100 being in a normal placement posture, with the battery cell body 2 having a bottom side 2c and a top side 2d in the vertical direction. The normal placement posture refers to the posture that the battery cell 100 needs to maintain when in operation. Of course, the battery cell 100 can also be in a non-operational posture.

[0196] In the above embodiments, the heat exchange inlet 31 can also be located on the top side 2d, and the heat exchange outlet 32 ​​can also be located on the bottom side 2c, and is not limited to these locations. Figure 8 The structure shown.

[0197] like Figure 7 and Figure 8 As shown, both the heat exchange inlet 31 and the heat exchange outlet 32 ​​are used to communicate with the heat exchange plate 200. The heat exchange plate 200 has flow channels inside, and both the heat exchange inlet 31 and the heat exchange outlet 32 ​​are connected to the flow channels of the heat exchange plate 200. The specific shape of the flow channels of the heat exchange plate 200 and the shape of the heat exchange plate 200 are selected according to the actual situation, and this embodiment of the application does not limit this.

[0198] The heat exchange plate 200 can correspond one-to-one with the heat exchange inlet 31 of the battery cell 100, or the heat exchange plate 200 can correspond to at least two heat exchange inlets 31 of the battery cell 100. Correspondingly, the heat exchange plate 200 can correspond one-to-one with the heat exchange outlet 32 ​​of the battery cell 100, or the heat exchange plate 200 can correspond to at least two heat exchange outlets 32 of the battery cell 100.

[0199] Continue to refer to Figure 7 and Figure 8 Based on the positions of the heat exchange inlet 31 and the heat exchange outlet 32, the heat exchange inlet 31 is used to connect with the first heat exchange plate 200a, and the heat exchange outlet 32 ​​is used to connect with the second heat exchange plate 200b. The first heat exchange plate 200a and the heat exchange inlet 31 are located on one side of the cell body 2 in the vertical direction, and the second heat exchange plate 200b and the heat exchange outlet 32 ​​are located on the other side of the cell body 2 in the vertical direction. This facilitates the connection between the heat exchange inlet 31 and the first heat exchange plate 200a, and also facilitates the connection between the heat exchange outlet 32 ​​and the second heat exchange plate 200b.

[0200] The first heat exchange plate 200a can correspond one-to-one with a battery cell 100 (heat exchange inlet 31), or the first heat exchange plate 200a can correspond to at least two battery cells 100 (heat exchange inlets 31). Correspondingly, the second heat exchange plate 200b can correspond one-to-one with a battery cell 100 (heat exchange outlet 32), or the second heat exchange plate 200b can correspond to at least two battery cells 100 (heat exchange outlet 32).

[0201] For further details regarding the first heat exchange plate 200a and the second heat exchange plate 200b, please refer to the previous description of heat exchange plate 200.

[0202] The heat exchange inlet 31 can be located on the fifth side 25, and the heat exchange outlet 32 ​​can be located on the tab side 26. Based on this, when the heat exchange outlet 32 ​​is located on the top side 2d, the tab side 26 of the cell body 2 can be the top side 2d. In this way, the tab side 26 is located at the top of the cell body 2 in the vertical direction, realizing the upright placement of the cell 100, which facilitates the wiring of the tab 27 of the cell 100.

[0203] In practice, the position of the tab side 26 can be adjusted by adjusting the side where the heat exchange inlet 31 is located and the side where the heat exchange outlet 32 ​​is located.

[0204] In other embodiments, such as Figure 18 As shown, the heat exchange inlet 31 is located on the third surface 23 of the cell body 2, as... Figure 19 As shown, heat exchange outlet 32 ​​is located on the fourth surface 24. Figure 20 As shown, the heat exchange inlet 31 is used to connect with the first heat exchange plate 200a, and the heat exchange outlet 32 ​​is used to connect with the second heat exchange plate 200b. The first heat exchange plate 200a and the heat exchange inlet 31 are located on one side of the cell body 2 in the vertical direction, and the second heat exchange plate 200b and the heat exchange outlet 32 ​​are located on the other side of the cell body 2 in the vertical direction. The vertical direction can be the second direction mentioned above.

[0205] In the above structure, one of the third side 23 and the fourth side 24 can be the top side 2d of the battery cell body 2, and the other can be the bottom side 2c of the battery cell body 2. In this case, the tab side 26 of the battery cell body 2 is located between the top side 2d and the bottom side 2c. It can be understood that the tab side 26 is one side of the battery cell body 2 in the horizontal direction, and the horizontal direction is perpendicular to the vertical direction, realizing the side placement of the battery cell 100, which can meet the placement requirements of the blade battery cell. When the vertical direction is the second direction, the horizontal direction can be the third direction mentioned above.

[0206] In Embodiment 1 of this application, the first main flow channel 33a and the second main flow channel 33b can be connected in parallel between the heat exchange inlet 31 and the heat exchange outlet 32, or they can be connected in series between the heat exchange inlet 31 and the heat exchange outlet 32. The following is in conjunction with... Figures 21-24 This describes a scheme in which the first main channel 33a and the second main channel 33b are connected in series between the heat exchange inlet 31 and the heat exchange outlet 32.

[0207] like Figure 21 As shown, the first main flow channel 33a and the second main flow channel 33b are connected in series at the heat exchange inlet 31 and the heat exchange outlet 32, and are connected through the intermediate flow channel 37. It can be understood that the inlet of the first main flow channel 33a is connected to the heat exchange inlet 31, the outlet of the first main flow channel 33a is connected through the intermediate flow channel 37 to the inlet of the second main flow channel 33b, and the outlet of the second main flow channel 33b is connected to the heat exchange outlet 32. In this way, the heat exchange medium first flows through the first main flow channel 33a and the first branch flow channel 34a connected to it, and then flows through the second main flow channel 33b and the second branch flow channel 34b connected to it. This allows the first main flow channel 33a and the first branch flow channel 34a to be positioned on the higher-temperature side of the cell body 2, while the second main flow channel 33b and the second branch flow channel 34b are positioned on the lower-temperature side of the cell body 2, thus balancing the temperature of each side of the cell body 2 and improving the temperature uniformity of the cell 100.

[0208] The intermediate flow channel 37 can be a square flat tube or other types of heat exchange tube, or the intermediate flow channel 37 can be a plate structure with a flow channel. This application does not limit this.

[0209] As mentioned above, the first side 2a and the second side 2b are provided with branch channels 34. Based on this, in order to improve heat exchange efficiency, the side where the middle channel 37 is located is adjacent to the first side 2a and the second side 2b. In this way, the number of sides that exchange heat with the heat exchange channel 3 is increased, further improving the temperature uniformity of the cell 100.

[0210] Of course, the intermediate flow channel 37 can also be distributed on other sides of the cell body 2, and this application embodiment does not limit this.

[0211] As mentioned earlier, the first main flow channel 33a and the second main flow channel 33b are connected in series between the heat exchange inlet 31 and the heat exchange outlet 32. Therefore, in order to simplify the structure of the heat exchange channel 3, as follows: Figure 22 As shown, the heat exchange inlet 31 and the heat exchange outlet 32 ​​are located on the same side of the cell body 2. For example, both the heat exchange inlet 31 and the heat exchange outlet 32 ​​are located on the fifth side 25 of the cell body 2. In this case, as... Figure 23 As shown, the intermediate flow channel 37 can be located on the tab side 26. In order to avoid the intermediate flow channel 37 affecting the tab 27, the intermediate flow channel 37 is located at one end of the tab side 26 in the first direction and at one end in the second direction.

[0212] like Figure 24As shown, the battery cell body 2 has a bottom side 2c and a top side 2d in the vertical direction, which can be a third direction. The heat exchange inlet 31 and heat exchange outlet 32 ​​of the heat exchange channel 3 are both located on the bottom side 2c. This allows the heat exchange medium to enter and exit the heat exchange channel 3 from the bottom side of the battery cell body 2, reducing the impact of heat exchange medium leakage at the heat exchange inlet 31 and heat exchange outlet 32 ​​on the battery cell body 2.

[0213] It should be noted that the battery cell body 2 has a bottom side 2c and a top side 2d in the vertical direction. This can be understood as the battery cell 100 being in a normal placement posture, with the battery cell body 2 having a bottom side 2c and a top side 2d in the vertical direction. The normal placement posture refers to the posture that the battery cell 100 needs to maintain when in operation. Of course, the battery cell 100 can also be in a non-operational posture.

[0214] In practice, the heat exchange inlet 31 and heat exchange outlet 32 ​​of the heat exchange channel 3 can also be located on the top side 2d of the cell body 2 in the vertical direction. In this way, the heat exchange medium can enter and exit the heat exchange channel 3 from the top side of the cell body 2.

[0215] In order to reduce the number of heat exchange plates 200 and reduce heat exchange costs, both heat exchange inlet 31 and heat exchange outlet 32 ​​are used to connect with the third heat exchange plate 200c. It can be understood that both heat exchange inlet 31 and heat exchange outlet 32 ​​are used to connect with the same third heat exchange plate 200c.

[0216] The third heat exchange plate 200c can correspond one-to-one with a battery cell 100, or the third heat exchange plate 200c can correspond to at least two battery cells 100. For other descriptions of the third heat exchange plate 200c, please refer to the previous description of the heat exchange plate 200.

[0217] To facilitate the connection between the heat exchange inlet 31 and the third heat exchange plate 200c, and the heat exchange outlet 32 ​​and the third heat exchange plate 200c, the heat exchange inlet 31, the heat exchange outlet 32 ​​and the third heat exchange plate 200c are located on one side of the cell body 2 in the vertical direction.

[0218] In practice, the heat exchange inlet 31 and the heat exchange outlet 32 ​​can also be connected to different heat exchange plates 200, and are not limited to the above embodiments.

[0219] As mentioned above, the heat exchange inlet 31 and the heat exchange outlet 32 ​​can both be located on the fifth side 25 of the cell body 2. Based on this, when the heat exchange inlet 31 and the heat exchange outlet 32 ​​are both located on the bottom side 2c, the heat exchange inlet 31, the heat exchange outlet 32 ​​and the third heat exchange plate 200c are located on the bottom side of the cell body 2 in the vertical direction. The tab side 26 of the cell body 2 can be the top side 2d. In this way, the tab side 26 is located at the top of the cell body 2 in the vertical direction, realizing the upright placement of the cell 100, which facilitates the wiring of the tab 27 of the cell 100.

[0220] In practice, the position of the tab side 26 can be adjusted by changing the side where the heat exchange inlet 31 is located and the side where the heat exchange outlet 32 ​​is located. For example, the tab side 26 of the cell body 2 is located between the top side 2d and the bottom side 2c. This can be understood as the tab side 26 being one side of the cell body 2 in the horizontal direction, with the horizontal direction perpendicular to the vertical direction. This allows the cell 100 to be placed on its side, which meets the placement requirements of the blade cell. When the vertical direction is the third direction, the horizontal direction can be the second direction mentioned above.

[0221] In Embodiment 1 of this application, the main channel 33 of the heat exchange channel 3 is primarily used to guide the heat exchange medium to a specific side of the battery cell body 2, and to exchange heat with the specific side through the branch channels 34. The branch channels 34 in the heat exchange channel 3 play a primary heat exchange role, while the main channel 33 plays a secondary heat exchange role. As mentioned above, at least a portion of the main channel 33 is located on the side where the branch channels 34 are located. Based on this, as... Figure 5 and Figure 6 As shown, the main flow channel 33 can be located at the end of its side, allowing more space on the side to be used for branch flow channels 34. This increases the side area through which the branch flow channels 34 pass, thus improving the heat exchange efficiency of the entire heat exchange channel 3.

[0222] For example, the side has four ends, with the main channel 33 located at one end of its side. Figure 5 As shown, the first main channel 33a is located on the first surface 21 and the third surface 23, with the first main channel 33a located at the end of the first surface 21 near the third surface 23 and the end of the third surface 23 near the first surface 21; as Figure 5 As shown, the second main channel 33b is located on the second surface 22 and the fourth surface 24. The second main channel 33b is located at the end of the second surface 22 near the fourth surface 24 and at the end of the fourth surface 24 near the second surface 22.

[0223] In Embodiment 1 of this application, the distribution of the branch channels 34 on the side is selected according to the actual situation. The larger the area of ​​each branch channel 34 covering the side, the higher the heat exchange efficiency; the smaller the area of ​​each branch channel 34 covering the side, the lower the heat exchange efficiency.

[0224] In the first embodiment of this application, the inlet channel 35 mentioned above can also be located at the end of the side where the inlet channel 35 is located. For example, Figure 5 As shown, the first inlet channel 35a is located at the end of the fifth surface 25 near the first surface 21, and the second inlet channel 35b is located at the end of the fifth surface 25 near the fourth surface 24.

[0225] In the first embodiment of this application, the outlet flow channel 36 mentioned above can also be located at the end of the side where the outlet flow channel 36 is located. For example, Figure 6 As shown, the first outlet channel 36a is located at the end of the tab side 26 near the first surface 21, and the second outlet channel 36b is located at the end of the tab side 26 near the fourth surface 24. This allows the outlet channel 36 to avoid the tab 27.

[0226] In this embodiment of the application, the battery cell 100 can be a square battery cell, a blade battery cell, a pouch battery cell, or a cylindrical battery cell, etc. This embodiment of the application does not limit the type of battery cell 100.

[0227] Embodiment 1 of this application also provides a battery cell assembly, such as Figure 9 and Figure 16 As shown, the battery cell assembly includes battery cell 100. Since battery cell 100 possesses the aforementioned technical effects, the battery pack also possesses corresponding technical effects, which will not be elaborated upon here.

[0228] In the battery cell assembly, there are at least two battery cells 100. The at least two battery cells 100 can be arranged side by side, for example, the at least two battery cells 100 can be arranged side by side along a first direction or a second direction.

[0229] As mentioned above, the electrode side 26 of the battery cell 100 is provided with electrode 27. In order to facilitate the electrical connection between all the battery cells 100, the electrode side 26 of two adjacent battery cells 100 are adjacent, and the electrode 27 of two adjacent battery cells 100 are electrically connected through the connector 300.

[0230] It should be noted that the connector 300 is located outside the housing. To illustrate the heat exchange channel 3, Figure 9 and Figure 16 The casing of cell 100 is hidden inside.

[0231] The connector 300 is a conductive component, and can be a conductive sheet or a conductive block, etc. For example, the connector 300 can be an aluminum sheet or an aluminum block. This application embodiment does not limit the type of connector 300.

[0232] For example, in two adjacent battery cells 100, the positive electrode tab 27a of one battery cell 100 can be electrically connected to the negative electrode tab 27b of the other battery cell 100 through a connector 300, thus realizing the series connection of the two battery cells 100. Of course, the positive electrode tab 27a of one battery cell 100 can also be electrically connected to the positive electrode tab 27a of the other battery cell 100 through a connector 300, and the negative electrode tab 27b of one battery cell 100 can also be electrically connected to the negative electrode tab 27b of the other battery cell 100 through another connector 300, thus realizing the parallel connection of the two battery cells 100.

[0233] Because the connector 300 is conductive and is a heat-generating component, heat accumulates in the connector 300 under excessive current, leading to a high temperature. To reduce the temperature of the connector 300, a portion of the heat exchange channel 3 and a portion of the connector 300 overlap and are thermally connected on the tab side 26. In this way, a portion of the heat exchange channel 3 passes through both the tab side 26 and the connector 300, allowing for heat exchange between the heat exchange channel 3 and the connector 300, thereby dissipating heat and lowering the temperature of the connector 300.

[0234] For example, the outlet channel 36 of the heat exchange channel 3 and a portion of the connector 300 overlap on the tab side 26. In practice, other channels of the heat exchange channel 3 and portions of the connector 300 may also overlap on the tab side 26.

[0235] It should be noted that the heat exchange channel 3 dissipates heat from the connector 300 based on the premise that the battery cell body 2 also needs to dissipate heat. When the battery cell body 2 needs to be heated, the heat exchange channel 3 can heat the connector 300.

[0236] Embodiment 1 of this application also provides a battery pack, which includes the heat exchange plate 200 and the battery cell 100 mentioned above, wherein the heat exchange inlet 31 and the heat exchange outlet 32 ​​of the heat exchange channel 3 are both connected to the heat exchange plate 200; or, the battery pack includes the battery cell group mentioned above.

[0237] Since cell 100 and cell pack have the aforementioned technical effects, the battery pack also has corresponding technical effects, which will not be elaborated here.

[0238] To facilitate the connection between heat exchange channel 3 and heat exchange plate 200, such as Figure 1 and Figure 2 As shown, both the heat exchange inlet 31 and the heat exchange outlet 32 ​​protrude from the surface of the battery cell 100. This facilitates the connection between the heat exchange inlet 31 and the heat exchange plate 200, as well as the heat exchange outlet 32 ​​and the heat exchange plate 200; moreover, in the event of leakage at the connection between the heat exchange channel 3 and the heat exchange plate 200, it reduces the probability of leaked heat exchange medium entering the battery cell 100.

[0239] When the heat exchange channel 3 is located inside the housing 1, both the heat exchange inlet 31 and the heat exchange outlet 32 ​​extend to the outside of the housing 1, protruding from the surface of the battery cell 100. It should be noted that the housing 1 is provided with openings corresponding to the heat exchange inlet 31 and the heat exchange outlet 32. When the heat exchange channel 3 is located outside the housing 1, both the heat exchange inlet 31 and the heat exchange outlet 32 ​​protrude from the surface of the battery cell 100.

[0240] A joint may or may not be installed at the heat exchange inlet 31, and a joint may or may not be installed at the heat exchange outlet 32.

[0241] like Figure 8 As shown, the heat exchange plate 200 is provided with a connection port 201. Both the heat exchange inlet 31 and the heat exchange outlet 32 ​​are connected to the connection port 201, so that the heat exchange inlet 31 can be connected to the heat exchange plate 200 and the heat exchange outlet 32 ​​can be connected to the heat exchange plate 200, which helps to improve assembly efficiency.

[0242] As mentioned above, the heat exchange inlet 31 and the heat exchange outlet 32 ​​are located on at least one side of the cell body 2 in the vertical direction. To reduce the height of the battery pack in the vertical direction, the connection port 201 can be recessed. Wherein, as Figure 8 and Figure 24 As shown, the vertical direction can be a third direction; such as Figure 20 As shown, the vertical direction can also be the second direction.

[0243] For example, the heat exchange plate 200 may be provided with a groove 202, and the connection port 201 is provided in the groove 202; wherein, the groove 202 can accommodate the entire battery cell 100; or, the groove 202 does not accommodate the entire battery cell 100, and the groove 202 accommodates the heat exchange inlet 31 and the heat exchange outlet 32.

[0244] In practice, the connection port 201 can also be flush with the surface of the heat exchange plate 200.

[0245] In practice, the heat exchange inlet 31 and the heat exchange outlet 32 ​​can also be flush with the outer surface of the shell 1, which can reduce the size of the entire cell 100.

[0246] This application also provides an energy storage system, which includes the battery pack described in the above embodiments.

[0247] Since the battery pack has the aforementioned technical effects, the energy storage system also has corresponding technical effects, which will not be elaborated here.

[0248] In this first embodiment of the application, the energy storage system can be a residential energy storage system or other types, and this first embodiment of the application does not limit this.

[0249] Example 2 of this application

[0250] Figures 25-35 The battery cell provided in Embodiment 2 of this application is shown.

[0251] like Figure 25 and Figure 26 As shown, the battery cell 100 provided in this embodiment includes: a housing 1, a battery cell body 2, and a heat exchange channel 3.

[0252] For a description of the casing 1 and the battery cell body 2, please refer to Embodiment 1 of this application, which will not be described again here.

[0253] The heat exchange channel 3 may be located outside the shell 1, as detailed in Embodiment 1 of this application; or, the heat exchange channel 3 may be located inside the shell 1 and between the heat exchange channel 3 and the shell 1, as detailed in Embodiment 1 of this application.

[0254] In Embodiment 2 of this application, as Figure 27 As shown, the heat exchange channel 3 includes a main channel 33 and branch channels 34; the main channel 33 is provided on at least two sides of the battery cell body 2, and the main channel 33 covers at least a portion of the side on which it is located; the branch channels 34 are provided on at least two sides of the battery cell body 2, and the first port 341 and the second port 342 of the branch channel 34 are both connected to the main channel 33, and the branch channel 34 covers at least a portion of the side on which it is located. For a description of this part, please refer to Embodiment 1 of this application.

[0255] The main difference between the battery cell 100 provided in Embodiment 2 of this application and the battery cell 100 provided in Embodiment 1 of this application is that the main channel 33 and the branch channel 34 are located on different sides.

[0256] For example, such as Figure 28 and Figure 29 As shown, the main flow channel 33 is located on the third side 23, the fifth side 25 and the tab side 26 of the cell body 2, and the branch flow channel 34 is located on the first side 21 and the second side 22 of the cell body 2. It can be understood that the main flow channel 33 is provided on the three sides of the cell body 2, and the branch flow channel 34 is provided on the two sides of the cell body 2.

[0257] For example, such as Figures 30-32 As shown, the main flow channel 33 is located on the third side 23, the fifth side 25 and the tab side 26 of the cell body 2, and the branch flow channel 34 is located on the first side 21 and the fourth side 24 of the cell body 2. It can be understood that the main flow channel 33 is provided on the three sides of the cell body 2, and the branch flow channel 34 is provided on the two sides of the cell body 2.

[0258] For example, such as Figure 33 and Figure 34As shown, the main flow channel 33 is located on the third side 23, the fifth side 25 and the tab side 26 of the cell body 2, and the branch flow channel 34 is located on the first side 21, the second side 22 and the fourth side 24 of the cell body 2. It can be understood that the main flow channel 33 is provided on the three sides of the cell body 2, and the branch flow channel 34 is provided on the three sides of the cell body 2.

[0259] It should be noted that, Figure 34 It shows Figure 33 The diagram shown is a structural schematic of the heat exchange channel 3 installed in one direction behind the battery cell body 2. Figure 33 The schematic diagram of the heat exchange channel 3 installed in another direction after the cell body 2 can be referred to. Figure 31 .

[0260] In the second embodiment of this application, since the main flow channel 33 is provided on at least two sides of the battery cell body 2 and the branch flow channel 34 is provided on at least two sides of the battery cell body 2, and the main flow channel 33 and the branch flow channel 34 are located on different sides, heat exchange can be carried out on at least four sides of the battery cell body 2 through the main flow channel 33 and the branch flow channel 34, thereby increasing the heat exchange area and improving the heat exchange efficiency of the battery cell 100.

[0261] In Embodiment 2 of this application, the heat exchange inlet 31 and heat exchange outlet 32 ​​of the heat exchange channel 3 can be connected to the main channel 33. The first port 341 of the branch channel 34 is connected to the heat exchange inlet 31 through the main channel 33, and the second port 342 of the branch channel 34 is connected to the heat exchange outlet 32 ​​through the main channel 33. For a description of this part, please refer to Embodiment 1 of this application.

[0262] In practice, at least one of the heat exchange inlet 31 and heat exchange outlet 32 ​​can also be set on the branch channel 34, and is not limited to the above structure.

[0263] In Embodiment 2 of this application, there may be one or more branch channels 34 located on the same side. For a description of this part, please refer to Embodiment 1 of this application.

[0264] In Embodiment 2 of this application, at least two sides of the branch channel 34 may include opposing sides. In some embodiments, such as Figure 28 and Figure 29 As shown, the opposing sides of the cell body 2 include a first side 2a and a second side 2b. Both the first side 2a and the second side 2b are provided with branch channels 34. The first side 21 mentioned above is the first side 2a, and the second side 22 mentioned above is the second side 2b. This improves the temperature uniformity of the cell body 2, thereby improving the temperature uniformity of the entire cell 100.

[0265] For ease of subsequent description, the branch channel 34 provided on the first side 2a can be referred to as the first branch channel 34a, and the branch channel 34 provided on the second side 2b can be referred to as the second branch channel 34b. It should be noted that the definition of the first branch channel 34a in Embodiment 2 of this application is different from the definition of the first branch channel 34a in Embodiment 1 of this application, and the definition of the second branch channel 34b in Embodiment 2 of this application is different from the definition of the second branch channel 34b in Embodiment 1 of this application.

[0266] In practice, the third side 23 mentioned above can be the first side 2a, and the fourth side 24 mentioned above can be the second side 2b; or, the first side 21 and the third side 23 mentioned above can both be the first side 2a, and the second side 22 and the fourth side 24 mentioned above can both be the second side 2b.

[0267] In the second embodiment of this application, at least two sides on which the branch channel 34 is provided may include adjacent sides.

[0268] In some embodiments, such as Figure 31 and Figure 32 As shown, the two adjacent sides of the battery cell body 2 include a first side 2a and a third side 2e, and both the first side 2a and the third side 2e are provided with a branch channel 34.

[0269] For example, both the first surface 21 and the fourth surface 24 are provided with branch channels 34, the first surface 21 is the first side surface 2a, and the fourth surface 24 is the third side surface 2e. Of course, the third surface 23 can also be the third side surface 2e.

[0270] The above embodiment achieves the provision of branch channels 34 on both sides, which is beneficial to improve the heat exchange effect between the heat exchange channel 3 and the battery cell body 2; the two sides with branch channels 34 are adjacent to each other, which can meet the heat exchange requirements of adjacent sides in the battery cell body 2.

[0271] For ease of subsequent description, the branch channel 34 provided on the third side 2e can be referred to as the third branch channel 34c.

[0272] In some other embodiments, adjacent sides of the cell body 2 include a second side 2b and a third side 2e, both of which are provided with branch channels 34. For example, the second side 22 is the second side 2b, and the fourth side 24 is the third side 2e. Of course, the third side 23 can also be the third side 2e.

[0273] The above embodiment also achieves the provision of branch channels 34 on both sides, which is beneficial to improve the heat exchange effect between the heat exchange channel 3 and the battery cell body 2; the two sides with branch channels 34 are adjacent to each other, which can meet the heat exchange requirements of adjacent sides in the battery cell body 2.

[0274] In the second embodiment of this application, the at least two sides on which the branch channel 34 is provided may further include adjacent sides and opposite sides. Specifically, as shown... Figure 34 and Figure 31 As shown, the adjacent two sides of the battery cell body 2 include a first side 2a and a third side 2e, and both the first side 2a and the third side 2e are provided with a branch channel 34; the adjacent two sides of the battery cell body 2 include a second side 2b and a third side 2e, and both the second side 2b and the third side 2e are provided with a branch channel 34; wherein, the first side 2a and the second side 2b are distributed opposite to each other.

[0275] For example, the first surface 21 is the first side surface 2a, the second surface 22 is the second side surface 2b, and the fourth surface 24 is the third side surface 2e. The first surface 21, the second surface 22, and the fourth surface 24 are all provided with branch channels 34. Of course, the third surface 23 can also be the third side surface 2e.

[0276] The above structure provides branch channels 34 on all three sides, which is beneficial to improving the heat exchange effect between the heat exchange channel 3 and the battery cell body 2. Two of the three sides with branch channels 34 are adjacent and two are opposite to each other, which can meet the heat exchange requirements of adjacent and opposite sides in the battery cell body 2.

[0277] The preceding text describes the specific distribution of at least two sides with branch channels 34. The side where the branch channels 34 are located can be flexibly selected according to the heat exchange requirements of the battery cell body 2, which improves the design flexibility of the heat exchange channel 3 and makes it easier to meet the different heat exchange requirements of the battery cell body 2.

[0278] In Embodiment 2 of this application, the at least two sides on which the main channel 33 is provided may include two adjacent sides, two opposite sides, or two adjacent sides and two opposite sides. In some embodiments, such as Figures 27-29 As shown, the main channel 33 includes a first main channel 33a and a second main channel 33b, with at least a portion of the first main channel 33a located on the side and at least a portion of the second main channel 33b located on the side opposite to each other; the first port 341 of the branch channel 34 is connected to the first main channel 33a, and the second port 342 of the branch channel 34 is connected to the second main channel 33b.

[0279] In the above structure, at least a portion of the first main channel 33a and at least a portion of the second main channel 33b are located on opposite sides, which facilitates the connection between the first port 341 and the second port 342 of the branch channel 34 and the main channel 33, and also enables heat exchange between the main channel 33 and the opposite sides of the cell body 2, thereby improving the temperature uniformity of the cell body 2.

[0280] It should be noted that the first port 341 of the first branch channel 34a mentioned above is connected to the first main channel 33a, and the second port 342 of the first branch channel 34a is connected to the second main channel 33b; the first port 341 of the second branch channel 34b mentioned above is connected to the first main channel 33a, and the second port 342 of the second branch channel 34b is connected to the second main channel 33b; the first port 341 of the third branch channel 34c mentioned above is connected to the first main channel 33a, and the second port 342 of the third branch channel 34c is connected to the second main channel 33b.

[0281] To increase the number of sides where the main channel 33 is located in order to improve heat exchange efficiency, such as Figure 33 , Figure 34 and Figure 31 As shown, the first main channel 33a includes a main channel section 335 and a main channel section 336 connected to the main channel section 335. The side where the main channel section 335 is located is adjacent to the side where the main channel section 336 is located. The second main channel 33b includes a main channel section 337 and a main channel section 338 connected to the main channel section 337. The side where the main channel section 337 is located is adjacent to the side where the main channel section 338 is located. The side where the main channel section 335 is located and the side where the main channel section 338 is located are the same side. The side where the main channel section 336 is located and the side where the main channel section 337 is located are opposite to each other.

[0282] For example, the first and fourth sections of the main channel 335 are both located on the third surface 23, the second section of the main channel 336 is located on the side of the electrode ear 26, and the third section of the main channel 337 is located on the fifth surface 25.

[0283] In the above structure, the main channel 33 is provided on all three sides of the main cell body 2, which increases the heat exchange area between the main channel 33 and the main cell body 2 and improves the heat exchange efficiency; the side where the second section 336 of the main channel is located and the side where the third section 337 of the main channel is located are relatively distributed, which improves the temperature uniformity of the main cell body 2; the side where the first section 335 of the main channel is located and the side where the fourth section 338 of the main channel is located are the same side, which makes the main channel 33 concentrated and convenient to set up.

[0284] In practice, the first main channel 33a may include the second main channel section 336 but exclude the first main channel section 335, and the second main channel 33b may include the third main channel section 337 but exclude the fourth main channel section 338. In this case, the heat exchange inlet 31 is located in the second main channel section 336, and the heat exchange outlet 32 ​​is located in the third main channel section 337.

[0285] As mentioned above, the first side 2a and the second side 2b of the battery cell body 2 are opposite each other and both are provided with branch channels 34. The branch channel 34 located on the first side 2a is called the first branch channel 34a, and the branch channel 34 located on the second side 2b is called the second branch channel 34b. Figure 33 As shown, the first port 341 of the first branch channel 34a is connected to the first section 335 of the main channel, and the second port 342 of the first branch channel 34a is connected to the fourth section 338 of the main channel; the first port 341 of the second branch channel 34b is connected to the second section 336 of the main channel, and the second port 342 of the second branch channel 34b is connected to the third section 337 of the main channel. This facilitates the connection between the first branch channel 34a and the main channel 33, and between the second branch channel 34b and the main channel 33, simplifying the structure of the entire heat exchange channel 3. Furthermore, by connecting the first branch channel 34a and the second branch channel 34b in parallel between the outlet of the first main channel 33a and the inlet of the second main channel 33b, the temperature difference between the heat exchange medium flowing through the first branch channel 34a and the heat exchange medium flowing through the second branch channel 34b is smaller, reducing the temperature difference between the first side surface 2a and the second side surface 2b, improving the temperature uniformity of the battery cell, and also improving the heat exchange efficiency of the battery cell.

[0286] like Figure 33 , Figure 34 and Figure 31 As shown, the heat exchange channel 3 also includes a branch channel 38. The branch channel 38 is located on the side where the first section 335 and the fourth section 338 of the main channel are located, and the branch channel 38 covers the part of the side where it is located. The branch channel 38 is located between the first port 341 and the second port 342 of the first branch channel 34a, and the branch channel 38 is connected in series with the first branch channel 34a. In this way, by adding the branch channel 38 connected in series with the first branch channel 34a, the heat exchange area of ​​the heat exchange channel 3 and the cell body 2 is increased, and the heat exchange efficiency is improved. Moreover, the branch channel 38 is located between the first port 341 and the second port 342 of the first branch channel 34a, so that the branch channel 38 is located between the first section 335 and the fourth section 338 of the main channel, which improves the uniformity of the distribution of the heat exchange channel 3 on the side where the branch channel 38 is located, thereby improving the temperature uniformity of the cell body 2.

[0287] It should be noted that the side where the branch channel 38 is located and the side where the third branch channel 34c is located can be relatively distributed, which further improves the temperature uniformity of the entire cell.

[0288] In practice, in order to improve the heat exchange capacity of the heat exchange channel 3, the heat exchange channel 3 may also include a branch channel 38 but not a third branch channel 34c, or the heat exchange channel 3 may also include a third branch channel 34c but not a branch channel 38.

[0289] As mentioned above, the heat exchange inlet 31 and heat exchange outlet 32 ​​of the heat exchange channel 3 can both be located in the main channel 33. This is to facilitate the flow of the heat exchange medium. Figure 33 As shown, the heat exchange inlet 31 of the heat exchange channel 3 is located in the first section 335 of the main channel, and the heat exchange outlet 32 ​​of the heat exchange channel 3 is located in the fourth section 338 of the main channel. Of course, the heat exchange inlet 31 can also be located in the fourth section 338 of the main channel, and the heat exchange outlet 32 ​​can also be located in the first section 335 of the main channel.

[0290] Since the first section 335 and the fourth section 338 of the main flow channel are located on the same side, the heat exchange inlet 31 and the heat exchange outlet 32 ​​are located on the same side of the cell body 2. Figure 35 As shown, both the heat exchange inlet 31 and the heat exchange outlet 32 ​​are located on the bottom side 2c of the cell body 2 in the vertical direction, which can be the second direction mentioned above. In this way, the heat exchange medium can enter and exit the heat exchange channel 3 on the bottom side of the cell body 2, reducing the impact of heat exchange medium leakage at the heat exchange inlet 31 and heat exchange outlet 32 ​​on the cell body 2.

[0291] In practice, the heat exchange inlet 31 and heat exchange outlet 32 ​​of the heat exchange channel 3 can also be located on the top side 2d of the cell body 2 in the vertical direction. In this way, the heat exchange medium can enter and exit the heat exchange channel 3 from the top side of the cell body 2.

[0292] In Embodiment 2 of this application, as Figure 35 As shown, both the heat exchange inlet 31 and the heat exchange outlet 32 ​​can be used to connect to the fourth heat exchange plate 200d. It can be understood that both the heat exchange inlet 31 and the heat exchange outlet 32 ​​are used to connect to the same fourth heat exchange plate 200d. This reduces the number of heat exchange plates 200 and lowers the heat exchange cost.

[0293] The fourth heat exchange plate 200d can correspond one-to-one with a battery cell 100, or the fourth heat exchange plate 200d can correspond to at least two battery cells 100. For other descriptions of the fourth heat exchange plate 200d, please refer to the previous description of the heat exchange plate 200.

[0294] To facilitate the connection between the heat exchange inlet 31 and the fourth heat exchange plate 200d, and the heat exchange outlet 32 ​​and the fourth heat exchange plate 200d, the heat exchange inlet 31, the heat exchange outlet 32 ​​and the fourth heat exchange plate 200d are located on one side of the cell body 2 in the vertical direction.

[0295] In practice, the heat exchange inlet 31 and the heat exchange outlet 32 ​​can also be connected to different heat exchange plates 200, and are not limited to the above embodiments.

[0296] As mentioned above, both the heat exchange inlet 31 and the heat exchange outlet 32 ​​can be located on the third side 23 of the cell body 2. Based on this, when both the heat exchange inlet 31 and the heat exchange outlet 32 ​​are located on the bottom side 2c, the heat exchange inlet 31, the heat exchange outlet 32, and the third heat exchange plate 200c can all be located on the bottom side of the cell body 2 in the vertical direction. The tab side 26 of the cell body 2 can be located on one side of the cell body 2 in the horizontal direction, with the horizontal direction perpendicular to the vertical direction. If the vertical direction is the second direction, the horizontal direction can be one of the third directions mentioned above. This achieves the side-mounted placement of the cell 100, meeting the placement requirements of blade cells.

[0297] In practice, the position of the tab side 26 can be adjusted by adjusting the side where the heat exchange inlet 31 is located and the side where the heat exchange outlet 32 ​​is located. For example, the tab side 26 of the cell body 2 is located on the top side 2d, which realizes the upright placement of the cell 100.

[0298] Embodiment 2 of this application also provides a cell assembly, a battery pack, and an energy storage system. For a description of the cell assembly, battery pack, and energy storage system, please refer to the preceding text, which will not be repeated here.

[0299] In Embodiment 2 of this application, a portion of the heat exchange channel 3 and a portion of the connector overlap and are thermally connected on the tab side 26. For example, the main channel section 336 of the heat exchange channel 3 and a portion of the connector overlap and are thermally connected on the tab side 26. For a description of the connector, please refer to the preceding text; it will not be repeated here.

[0300] Since the second section 336 of the main flow channel is located on the side 26 of the electrode tab, the second section 336 of the main flow channel can exchange heat with the connector connecting the electrode tab 27. In order to avoid the second section 336 of the main flow channel affecting the electrode tab 27, the second section 336 of the main flow channel is located at the end of the side 26 of the electrode tab. Specifically, the side 26 of the electrode tab has four ends, and the second section 336 of the main flow channel is located at one end along the first direction and one end along the third direction.

[0301] The technical features mentioned above, as well as those shown individually in the accompanying drawings, can be combined arbitrarily, provided that the combined technical features are not contradictory. All feasible combinations of features are those explicitly described herein. Any one of the multiple technical features contained in the same statement can be applied independently, without necessarily being applied together with other technical features.

[0302] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery cell, characterized in that, include: The main body of the battery cell (2) and the heat exchange channel (3); The heat exchange channel (3) includes a main channel (33) and a branch channel (34); The main channel (33) is provided on the side of the cell body (2), and the main channel (33) covers at least a portion of the side on which it is located; The battery cell body (2) has branch channels (34) on at least two sides. The first port (341) and the second port (342) of the branch channel (34) are connected to the main channel (33). The branch channel (34) covers at least a portion of the side on which it is located. At least a portion of the main channel (33) is located on the side where the tributary channel (34) is located.

2. The battery cell according to claim 1, characterized in that, The opposing sides of the battery cell body (2) include a first side (2a) and a second side (2b), and both the first side (2a) and the second side (2b) are provided with the branch channel (34).

3. The battery cell according to claim 1, characterized in that, The battery cell body (2) includes a first side (2a) and a side adjacent to the first side (2a), and the two adjacent sides are provided with the branch channel (34); Alternatively, the two adjacent sides of the battery cell body (2) include a second side (2b) and a side adjacent to the second side (2b), and the two adjacent sides are provided with the branch channel (34); Alternatively, one set of adjacent sides of the battery cell body (2) includes a first side (2a) and a side adjacent to the first side (2a), and another set of adjacent sides of the battery cell body (2) includes a second side (2b) and a side adjacent to the second side (2b). Each set of adjacent sides is provided with the branch channel (34), and the first side (2a) and the second side (2b) are distributed opposite to each other.

4. The battery cell according to claim 3, characterized in that, In the case of a pair of adjacent sides including a first side (2a) and a side adjacent to the first side (2a), and another pair of adjacent sides including a second side (2b) and a side adjacent to the second side (2b), the side adjacent to the first side (2a) in one pair of adjacent sides and the side adjacent to the second side (2b) in the other pair of adjacent sides are distributed relatively.

5. The battery cell according to claim 3, characterized in that, The tributary channels (34) on the adjacent two sides are connected to the same main channel (33).

6. The battery cell according to claim 5, characterized in that, The main channel (33) includes: a main channel part (331) and a main channel part (332) connected to the main channel part (331); There is an included angle between the first part (331) and the second part (332) of the main channel; Of the two adjacent sides, one side is provided with the main channel part (331) and the other side is provided with the main channel part (332); In the two adjacent sides, the main channel part (331) and the branch channel (34) on one side are connected, and the main channel part (332) and the branch channel (34) on the other side are connected.

7. The battery cell according to claim 5, characterized in that, One of the two adjacent sides is provided with the main channel (33).

8. The battery cell according to any one of claims 1-7, characterized in that, The opposing sides of the battery cell body (2) include a first side (2a) and a second side (2b); The main channel (33) includes a first main channel (33a) and a second main channel (33b), at least a portion of the first main channel (33a) is disposed on the first side (2a), and at least a portion of the second main channel (33b) is disposed on the second side (2b). At least one of the branch channels (34) is a first branch channel (34a), and the first port (341) and the second port (342) of the first branch channel (34a) are both connected to the first main channel (33a); at least one of the branch channels (34) is a second branch channel (34b), and the first port (341) and the second port (342) of the second branch channel (34b) are both connected to the second main channel (33b).

9. The battery cell according to claim 8, characterized in that, The first main flow channel (33a) and the second main flow channel (33b) are connected in parallel between the heat exchange inlet (31) and the heat exchange outlet (32) of the heat exchange channel (3).

10. The battery cell according to claim 9, characterized in that, The cell body (2) has a bottom side (2c) and a top side (2d) in the vertical direction; of the heat exchange inlet (31) and the heat exchange outlet (32), one is located on the bottom side (2c) and the other is located on the top side (2d).

11. The battery cell according to claim 10, characterized in that, The heat exchange inlet (31) is used to communicate with the first heat exchange plate (200a), and the heat exchange outlet (32) is used to communicate with the second heat exchange plate (200b). The first heat exchange plate (200a) and the heat exchange inlet (31) are located on one side of the cell body (2) in the vertical direction, and the second heat exchange plate (200b) and the heat exchange outlet (32) are located on the other side of the cell body (2) in the vertical direction.

12. The battery cell according to claim 10, characterized in that, The tab side (26) of the battery cell body (2) is the top side (2d); or, the tab side (26) of the battery cell body (2) is located between the top side (2d) and the bottom side (2c).

13. The battery cell according to claim 8, characterized in that, The first main channel (33a) and the second main channel (33b) are connected in series between the heat exchange inlet (31) and the heat exchange outlet (32) of the heat exchange channel (3), and the first main channel (33a) and the second main channel (33b) are connected through the intermediate channel (37).

14. The battery cell according to claim 13, characterized in that, The side where the intermediate flow channel (37) is located is adjacent to the first side (2a) and the second side (2b).

15. The battery cell according to claim 13, characterized in that, The heat exchange inlet (31) and heat exchange outlet (32) of the heat exchange channel (3) are both located on the bottom side (2c) or top side (2d) of the cell body (2) in the vertical direction.

16. The battery cell according to claim 15, characterized in that, The heat exchange inlet (31) and the heat exchange outlet (32) are both used to communicate with the third heat exchange plate (200c). The heat exchange inlet (31), the heat exchange outlet (32) and the third heat exchange plate (200c) are located on one side of the cell body (2) in the vertical direction.

17. The battery cell according to claim 15, characterized in that, The tab side (26) of the battery cell body (2) is the top side (2d) of the battery cell body (2); or, the tab side (26) of the battery cell body (2) is located between the top side (2d) and the bottom side (2c).

18. A battery cell, characterized in that, include: The main body of the battery cell (2) and the heat exchange channel (3); The heat exchange channel (3) includes a main channel (33) and a branch channel (34); The main channel (33) is provided on at least two sides of the cell body (2), and the main channel (33) covers at least a portion of the side on which it is located; The battery cell body (2) has branch channels (34) on at least two sides. The first port (341) and the second port (342) of the branch channel (34) are connected to the main channel (33). The branch channel (34) covers at least a portion of the side on which it is located. The main channel (33) and the tributary channel (34) are located on different sides.

19. The battery cell according to claim 18, characterized in that, The opposing sides of the battery cell body (2) include a first side (2a) and a second side (2b), and both the first side (2a) and the second side (2b) are provided with the branch channel (34).

20. The battery cell according to claim 18, characterized in that, The battery cell body (2) includes a first side (2a) and a third side (2e) on two adjacent sides, and both the first side (2a) and the third side (2e) are provided with the branch channel (34); And / or, the adjacent two sides of the cell body (2) include a second side (2b) and a third side (2e), and the second side (2b) and the third side (2e) are both provided with the branch channel (34); Wherein, when the cell body (2) has the first side (2a) and the second side (2b), the first side (2a) and the second side (2b) are distributed relative to each other.

21. The battery cell according to any one of claims 18-20, characterized in that, The main channel (33) includes a first main channel (33a) and a second main channel (33b), with at least a portion of the first main channel (33a) and at least a portion of the second main channel (33b) located on opposite sides; The first port (341) of the tributary channel (34) is connected to the first main channel (33a), and the second port (342) of the tributary channel (34) is connected to the second main channel (33b).

22. The battery cell according to claim 21, characterized in that, The first main channel (33a) includes a main channel section (335) and a main channel section (336) connected to the main channel section (335), wherein the side where the main channel section (335) is located and the side where the main channel section (336) is located are adjacent; The second main channel (33b) includes a main channel three-section (337) and a main channel four-section (338) connected to the main channel three-section (337), wherein the side where the main channel three-section (337) is located and the side where the main channel four-section (338) is located are adjacent; Among them, the side where the first section (335) of the main channel is located and the side where the fourth section (338) of the main channel is located are the same side, and the side where the second section (336) of the main channel is located and the side where the third section (337) of the main channel are located are opposite to each other.

23. The battery cell according to claim 22, characterized in that, When the first side (2a) and the second side (2b) of the battery cell body (2) are opposite each other and both are provided with the branch channel (34), the branch channel (34) located on the first side (2a) is the first branch channel (34a), and the branch channel (34) located on the second side (2b) is the second branch channel (34b). The first port (341) of the first branch channel (34a) is connected to the first section (335) of the main channel, and the second port (342) of the first branch channel (34a) is connected to the fourth section (338) of the main channel; The first port (341) of the second branch channel (34b) is connected to the second section (336) of the main channel, and the second port (342) of the second branch channel (34b) is connected to the third section (337) of the main channel.

24. The battery cell according to claim 23, characterized in that, The heat exchange channel (3) further includes a branch channel (38), which is located on the side where the first section (335) and the fourth section (338) of the main channel are located. The branch channel (38) covers the part of its side. The branch channel (38) is located between the first port (341) and the second port (342) of the first branch channel (34a), and the branch channel (38) is connected in series with the first branch channel (34a).

25. The battery cell according to claim 22, characterized in that, Of the heat exchange inlet (31) and heat exchange outlet (32) of the heat exchange channel (3), one is located in the first section (335) of the main channel and the other is located in the fourth section (338) of the main channel; the heat exchange inlet (31) and the heat exchange outlet (32) are both located on the bottom side (2c) or top side (2d) of the cell body (2) in the vertical direction.

26. The battery cell according to claim 25, characterized in that, The heat exchange inlet (31) and the heat exchange outlet (32) are used to communicate with the fourth heat exchange plate (200d). The heat exchange inlet (31), the heat exchange outlet (32) and the fourth heat exchange plate (200d) are located on one side of the cell body (2) in the vertical direction.

27. The battery cell according to claim 25, characterized in that, The tab side (26) of the battery cell body (2) is located between the top side (2d) and the bottom side (2c); or, the tab side (26) of the battery cell body (2) is the top side (2d) of the battery cell body (2).

28. The battery cell according to any one of claims 1-7 and 18-20, characterized in that, It also includes a housing (1), and the battery cell body (2) is located inside the housing (1); The heat exchange channel (3) is located inside the housing (1) and between the housing (1) and the battery cell body (2); or the heat exchange channel (3) is located outside the housing (1).

29. A battery cell assembly, characterized in that, Includes the battery cell (100) as described in any one of claims 1-28; The battery cell (100) has tabs (27) on its tab side (26). There are at least two battery cells (100). The tab sides (26) of two adjacent battery cells (100) are adjacent to each other. The tabs (27) of two adjacent battery cells (100) are electrically connected by a connector (300). A portion of the heat exchange channel (3) and a portion of the connector (300) overlap and are thermally connected on the tab side (26).

30. A battery pack, characterized in that, include: The battery cell assembly as described in claim 29; or, comprising a heat exchange plate (200) and a battery cell (100) as described in any one of claims 1-28, wherein the heat exchange inlet (31) and heat exchange outlet (32) of the heat exchange channel (3) are both connected to the heat exchange plate (200).

31. The battery pack according to claim 30, characterized in that, The heat exchange inlet (31) and the heat exchange outlet (32) both protrude from the surface of the battery cell (100). The heat exchange plate (200) is provided with a connection port (201), and the heat exchange inlet (31) and the heat exchange outlet (32) are both connected to the connection port (201).

32. An energy storage system, characterized in that, Includes the battery pack as described in claim 30 or 31.

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