Battery pack, electric device

Abstract

This application discloses a battery pack and an electrical device, relating to the field of battery technology. The battery pack includes multiple battery cells and a liquid cooling component disposed on at least one side of each battery cell. The liquid cooling component includes a first side plate, a second side plate, and a support member. The support member connects the first and second side plates to divide the flow channel cavity into two liquid cooling chambers. The first and / or second side plates are thermally connected to the battery cells. The support member includes a body portion and an elastic portion. At least one side of the body portion has a protruding elastic portion connected to the first or second side plate. The support member has a through hole that penetrates the body portion and the elastic portion to connect the two liquid cooling chambers. The liquid cooling component, while ensuring sufficient pre-tightening force for the battery cell stacking, can still absorb expansion force and withstand large expansion forces without being crushed. Simultaneously, the battery cells exhibit good temperature uniformity and adaptability during expansion.

Description

Technical Field

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

[0002] Existing battery packs use bottom cooling, which leads to uneven battery temperature and uneven battery expansion, affecting battery life. Increased fast charging rates also generate significant heat. Therefore, battery manufacturers are actively seeking large-area liquid cooling solutions, with cooling a large area of ​​the battery being a good option. However, batteries can expand, and this expansion can cause compression, severely impacting battery life. Summary of the Invention

[0003] The purpose of this invention is to provide a battery pack and an electrical device to solve the technical problem that the liquid cooling solution in the prior art will compress the expanding battery, resulting in a reduction in battery life.

[0004] In a first aspect, the present invention provides a battery pack comprising a plurality of battery cells and a liquid cooling component. The plurality of battery cells are arranged along a first direction, and the liquid cooling component is disposed on at least one side of the battery cells along the first direction. The liquid cooling component includes a first side plate, a second side plate, and a support member. The first side plate and the second side plate are disposed opposite to each other in the first direction and enclose a flow channel cavity. The support member is connected between the first side plate and the second side plate in the first direction to divide the flow channel cavity into two liquid cooling cavities arranged along the first direction. The first side plate and / or the second side plate are thermally connected to the battery cells. The support member includes a body portion and an elastic portion. The body portion is disposed between the first side plate and the second side plate in the first direction. The body portion has an elastic portion protruding in the first direction on at least one side in the first direction. The elastic portion is connected to the first side plate or the second side plate. The support member has a through hole in the first direction, which penetrates the body portion and the elastic portion to connect the two liquid cooling cavities.

[0005] Secondly, the present invention provides an electrical device including the aforementioned battery pack, wherein the battery pack supplies power to the electrical device.

[0006] The technical advantage of this invention lies in providing a battery pack and an electrical device. When a battery cell expands, the expansion force generated by the battery cell compresses the liquid cooling component, causing the first or second side plate to deform against the support component. When the first and / or second side plates adhere to the elastic portion of the support component under the action of the expansion force, the elastic portion can abut and support the first and / or second side plates to absorb the expansion force generated by the battery cell. Furthermore, a liquid cooling channel for the flow of liquid cooling medium still exists between the first and / or second side plates and the main body of the support component to cool the battery cell. When the battery cell does not expand, the first and / or second side plates are not compressed by the battery cell, and the liquid cooling medium can flow back and forth between the two liquid cooling cavities through the through holes of the elastic portion, effectively increasing the fluidity of the liquid cooling medium. At this time, the flow of the liquid cooling medium is relatively slow, but it can fill the entire flow channel cavity of the liquid cooling component, resulting in good temperature uniformity. Therefore, the liquid cooling component of this application can ensure that the internal gap of the liquid cooling component can absorb the expansion force while ensuring that sufficient pre-tightening force is applied to the stacking of battery cells. It can also withstand large expansion forces without being crushed. At the same time, the battery cells have good temperature uniformity and adaptability when they expand. Attached Figure Description

[0007] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0008] Figure 1 This is a schematic diagram of the overall structure of the battery pack provided in an embodiment of this application.

[0009] Figure 2 An exploded view of the battery pack provided in an embodiment of this application.

[0010] Figure 3 This is a schematic diagram of the assembly structure of the liquid cooling plate and the battery cell provided in this embodiment.

[0011] Figure 4 This is a partial exploded view of the liquid cooling plate and the battery cell provided in this embodiment.

[0012] Figure 5 Schematic diagram of the support member provided in this embodiment Figure 1 .

[0013] Figure 6 for Figure 5 A magnified view of part A in the middle.

[0014] Figure 7 This is a schematic diagram showing the flow direction of the liquid cooling medium when a battery cell expands, as provided in this embodiment.

[0015] Figure 8This is a schematic diagram showing the flow direction of the liquid cooling medium when the battery cell is not expanded, as provided in this embodiment.

[0016] Figure 9 This is a schematic diagram of the assembly structure of the liquid cooling component and the current collector provided in an embodiment of this application.

[0017] Figure 10 for Figure 9 A cross-sectional view along the AA direction.

[0018] Figure 11 Schematic diagram of the support member provided in this embodiment Figure 2 .

[0019] Figure 12 This is a side view of the liquid cooling plate and the battery cell provided in this embodiment.

[0020] Figure 13 for Figure 12 A cross-sectional view along the BB direction.

[0021] Figure 14 for Figure 13 A magnified view of part C in the middle.

[0022] Figure 15 for Figure 14 A magnified view of part D in the middle.

[0023] Figure 16 This is a schematic diagram of a structure in which multiple current collectors are connected by water pipes, as provided in an embodiment of this application.

[0024] Figure 17 Schematic diagram of the internal structure of the current collector provided in the application embodiment Figure 1 .

[0025] Figure 18 Schematic diagram of the internal structure of the current collector provided in the application embodiment Figure 2 .

[0026] Component labels in the attached diagram:

[0027] 100 Battery pack; 1 Battery cell; 11 First sidewall; 12 Second sidewall; 10 Space; 2 Liquid cooling component; 21 Side plate; 211 First side plate; 212 Second side plate; 2111 Fixing plate; 22 Support member; 221 First support plate; 222 Second support plate; 2211 First abutment; 2212 Second abutment; 210 Body part; 220 Elastic part; 2201 First protrusion; 2202 Second protrusion; 23 Through hole; 231 First through hole; 232 Second through hole; 24 Mounting hole; 230 Flow channel cavity; 2301 First liquid cooling cavity; 2302 Second liquid cooling cavity; 3 Current collector; 31 First current collector; 32 First... 2. Collection system; 30. Collection cavity; 301. Divider plate; 302. Divider channel; 303. Collection hole; 311. First collection plate; 312. Second collection plate; 313. Connecting plate; 3011. First sub-divider plate; 3012. Second sub-divider plate; 30121. First dividing section; 30122. Second dividing section; 3013. Third sub-divider plate; 30131. Third dividing section; 30132. Fourth dividing section; 30133. Fifth dividing section; 30130. Opening; 3131. First sub-connecting plate; 3132. Arc plate; 3130. Socket structure; 4. Box body; 40. Box opening; 5. Box cover; 6. Water pipe; 111. First part; 112. Second part. Detailed Implementation

[0028] 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 a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0029] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0030] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0031] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0032] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0033] To address the technical problem that existing liquid cooling solutions can compress expanding batteries, leading to reduced battery life, this application provides a battery pack including multiple battery cells and a liquid cooling component. The multiple battery cells are arranged along a first direction, and the liquid cooling component is disposed on at least one side of each battery cell along the first direction. The liquid cooling component includes a first side plate, a second side plate, and a support member. The first and second side plates are arranged opposite to each other in the first direction and enclose a flow channel cavity. The support member is connected between the first and second side plates in the first direction to divide the flow channel cavity into two liquid cooling cavities arranged along the first direction. The first and / or second side plates are thermally connected to the battery cells. The support member includes a body portion and an elastic portion. The body portion is disposed between the first and second side plates in the first direction. The body portion has an elastic portion protruding in the first direction on at least one side in the first direction. The elastic portion is connected to the first or second side plate. The support member has a through hole in the first direction, which penetrates the body portion and the elastic portion to connect the two liquid cooling cavities.

[0034] When a battery cell expands, the expansion force generated by the cell compresses the liquid cooling component, causing the first or second side plate to deform against the support. When the first and / or second side plates adhere to the elastic portion of the support under the expansion force, the elastic portion supports them, ensuring that a liquid cooling channel for the liquid cooling medium still exists between the first and / or second side plates and the main body of the support. The channel cavity is divided into two non-flowing liquid cooling chambers. When the battery cell does not expand, the first and / or second side plates are not compressed by the cell, and the liquid cooling medium can flow back and forth between the two liquid cooling chambers through the through-holes in the elastic portion, effectively increasing the fluidity of the liquid cooling medium. At this time, the flow of the liquid cooling medium is relatively slow, but it can fill the entire channel cavity of the liquid cooling component, resulting in good temperature uniformity. Therefore, the liquid cooling component of this application, while ensuring sufficient preload for stacking battery cells, still guarantees that the internal gaps of the liquid cooling component can absorb expansion forces and withstand large expansion forces without being crushed. At the same time, the battery cells also exhibit good temperature uniformity and adaptability during expansion. A detailed explanation follows.

[0035] In one embodiment, the battery pack includes individual battery cells. These individual battery cells include, but are not limited to, lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and this disclosure does not limit the specific types. The battery pack provides power to the electrical device. The electrical device can be a mobile phone, portable device, laptop computer, electric vehicle, electric car, ship, spacecraft, electric toy, and power tool, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.

[0036] like Figure 1 As shown, the battery pack 100 has a first direction X, a second direction Y, and a third direction Z that intersect each other in pairs, wherein the first direction X, the second direction Y, and the third direction Z intersect each other in pairs and are perpendicular.

[0037] like Figures 1 to 2 As shown, the battery pack 100 includes a housing 4 having an opening 40 and a bottom opposite the opening 40, i.e., the opening 40 is located at the top of the housing 4. The battery pack 100 also includes a cover 5 that closes to the opening 40.

[0038] The battery pack 100 also includes multiple battery cells 1, which are arranged along a first direction X to form a battery pack. The multiple battery packs are arranged along a second direction Y and housed inside the housing 4.

[0039] Each battery cell 1 has two first sidewalls 11, two second sidewalls 12, and two third sidewalls. The first sidewalls 11 are arranged opposite each other along a first direction X, the two second sidewalls 12 are arranged opposite each other along a second direction Y, and the two third sidewalls are arranged opposite each other along a third direction Z. The first sidewalls 11, second sidewalls 12, and third sidewalls are interconnected. The surface areas of the second sidewalls 12 and third sidewalls 21 are both smaller than the surface area of ​​the first sidewalls 11. That is, the first sidewalls 11 are the larger surfaces of the battery cell 1, and the second sidewalls 12 and third sidewalls are the smaller surfaces of the battery cell 1.

[0040] At least one of the two third sidewalls of the battery cell 1 is provided with a terminal post, which includes a positive terminal post and a negative terminal post, providing a corresponding connection point for an electrical device or circuit.

[0041] like Figure 4As shown, the battery pack 100 also includes a liquid cooling component 2, which is disposed on at least one side of the battery cell 1 along the first direction X. The liquid cooling component 2 is used to cool down the heat generated by the battery cell 1 to avoid the temperature from being too high and affecting the cycle performance of the power battery.

[0042] The liquid cooling component 2 includes a first side plate 211, a second side plate 212, and a support member 22. The first side plate 211 and the second side plate 212 are arranged opposite to each other in the first direction X and enclose a flow channel cavity 230. The support member 22 connects the first side plate 211 and the second side plate 212 in the first direction X to divide the flow channel cavity 230 into two liquid cooling cavities arranged along the first direction X. The two liquid cooling cavities are a first liquid cooling cavity 2301 and a second liquid cooling cavity 2302. The first liquid cooling cavity 2301 is formed by the first side plate 211 and the support member 22 on one side in the first direction X, and the second liquid cooling cavity 2302 is formed by the second side plate 212 and the support member 22 on the other side in the first direction X. The liquid cooling medium can flow back and forth between the first liquid cooling cavity 2301 and the second liquid cooling cavity 2302, or it can flow only within its respective liquid cooling cavity.

[0043] The first side plate 211 and / or the second side plate 212 are thermally connected to the battery cell 1 to achieve cooling of the battery cell 1. A specific implementation of "the first side plate 211 and / or the second side plate 212 are thermally connected to the battery cell 1" includes: when the liquid cooling component 2 is disposed between two adjacent battery cells 1 in the first direction X, one of the two first side walls 11 of the battery cell 1 is thermally connected to the first side plate 211 of the support member 22, and the other of the two first side walls 11 of the battery cell 1 is thermally connected to the second side plate 212 of the support member 22. When the liquid cooling component 2 is disposed between the side plate 21 of the battery cell 1 and the housing 4 in the first direction X, one of the two first side walls 11 of the battery cell 1 is thermally connected to the first side plate 211 of the support member 22, or the other of the two first side walls 11 of the battery cell 1 is thermally connected to the second side plate 212 of the support member 22.

[0044] like Figures 5 to 6 As shown, the support member 22 includes a body portion 210 and an elastic portion 220. The body portion 210 is disposed between the first side plate 211 and the second side plate 212 in the first direction X. The body portion 210 has an elastic portion 220 protruding along the first direction X on at least one side in the first direction X, and the elastic portion 220 is connected to the first side plate 211 or the second side plate 212. It can be understood that the body portion 210 has elastic portions 220 protruding along the first direction X on one or both sides in the first direction X. Figures 4 to 6 The diagram shows that the main body 210 has multiple elastic portions 220 protruding from the surface of the main body 210 on both sides in the first direction X.

[0045] Multiple elastic portions 220 are arranged in the second direction Y and the third direction Z, with at least two partially adjacent elastic portions 220 being staggered in the second direction Y and / or the third direction Z. It is understood that the multiple elastic portions 220 have odd-numbered and even-numbered columns in the second direction Y. The multiple elastic portions 220 arranged along the odd-numbered columns constitute a first elastic group, and the multiple elastic portions 220 arranged along the even-numbered columns constitute a second elastic group. The first elastic group and the second elastic group are arranged alternately in the third direction Z, and the elastic portions 220 of the first elastic group and the elastic portions 220 of the second elastic group are staggered in the third direction Z.

[0046] like Figure 7 As shown, a plurality of elastic portions 220 protruding from the surface of the body portion 210 are provided on at least one side of the body portion 210 in the first direction X. When the battery cell expands, the flow channel cavity 230 formed by the first side plate 211 and the second side plate 212 deforms as the battery cell 1 expands. Under the expansion force, the first side plate 211 and / or the second side plate 212 will adhere to the elastic portion 220, and the elastic portion 220 can provide abutment support for the first side plate 211 and / or the second side plate 212, so that there is still a liquid cooling channel for the flow of liquid cooling medium between the first side plate 211 and / or the second side plate 212 and the body portion 210 of the support member 22, and the flow channel cavity 230 is divided into two non-flowing liquid cooling cavities.

[0047] When the battery cell 1 is not expanded, the flow channel cavity 230 can be divided into two non-flowing liquid cooling cavities by the support member 22. Here, the flow channel cavity 230 when the battery cell 1 is expanded has a first state, and the flow channel cavity 230 when the battery cell 1 is not expanded has a second state. The internal space of the flow channel cavity 230 in the first state is smaller than the internal space in the second state. That is, the flow space of the flow channel cavity 230 is reduced under the action of expansion force. Therefore, under the condition of constant preset pressure, the liquid cooling medium will increase the flow rate in the liquid cooling cavity of the liquid cooling component 2 and increase the heat exchange efficiency, which helps to cool down quickly and achieve temperature uniformity by relying on the scattered arrangement of the elastic part 220.

[0048] like Figure 8 As shown, the support member 22 has a through hole 23 along the first direction X. The through hole 23 penetrates the body part 210 and the elastic part 220 to connect the two liquid cooling cavities. When the battery cell 1 does not expand, the first side plate 211 and / or the second side plate 212 are not squeezed by the battery cell 1. The liquid cooling medium can flow back and forth between the two liquid cooling cavities through the through hole 23 of the elastic part 220 to effectively increase the fluidity of the liquid cooling medium. At this time, the flow of the liquid cooling medium is relatively slow, but it can fill the entire flow channel cavity 230 of the liquid cooling component 2, and has good temperature uniformity performance.

[0049] Therefore, the liquid cooling component 2 of this application can ensure that the internal gap of the liquid cooling component 2 is used to absorb expansion while ensuring that sufficient pre-tightening force is applied to the stacking of battery cells 1, and can withstand large expansion force without being crushed. At the same time, the battery cells 1 also have good temperature uniformity and adaptability when expanding.

[0050] The aforementioned elastic portion 220 can be hemispherical, possessing high resistance to compression and capable of withstanding the expansion force generated by the battery cell 1. The center-line spacing between any two adjacent elastic portions 220 can be adjusted and determined using finite element analysis.

[0051] like Figures 9 to 10 As shown, the elastic portion 220 includes a first protrusion 2201 and a second protrusion 2202. The first protrusion 2201 protrudes towards the first side plate 211 relative to the body portion 210, and the second protrusion 2202 protrudes towards the second side plate 212 relative to the body portion 210. At least one of the first protrusion 2201 and the first side plate 211, and the second protrusion 2202 and the second side plate 212, is provided with a gap. It can be understood that a gap is provided between the first protrusion 2201 and the first side plate 211, or between the second protrusion 2202 and the second side plate 212, or both the first protrusion 2201 and the first side plate 211, and the second protrusion 2202 and the second side plate 212 are provided with gaps.

[0052] Therefore, when cell 1 does not expand, the combination Figure 8 As shown, the liquid cooling medium can flow through the gap between the first protrusion 2201 and the first side plate 211, or the liquid cooling medium can flow through the gap between the second protrusion 2202 and the second side plate 212, or the liquid cooling medium can flow through both the gap between the first protrusion 2201 and the first side plate 211 and the gap between the second protrusion 2202 and the second side plate 212. Conversely, when the battery cell 1 expands, the first protrusion 2201 abuts against the first side plate 211, and / or the second protrusion 2202 abuts against the second side plate 212 to support the first side plate 211 and / or the second side plate 212 to absorb the expansion force generated by the battery cell 1.

[0053] The aforementioned through-hole 23 includes a first through-hole 231 and a second through-hole 232. The first through-hole 231 penetrates the first protrusion 2201 along the first direction X, and the second through-hole 232 penetrates the second protrusion 2202 along the second direction Y. When the battery cell 1 does not expand, the first side plate 211 and / or the second side plate 212 are not squeezed by the battery cell 1, and the liquid cooling medium can flow back and forth between the two liquid cooling cavities through the first through-hole 231 and / or the second through-hole 232 to effectively increase the fluidity of the liquid cooling medium. At this time, the flow of the liquid cooling medium is relatively slow, but it can fill the entire flow channel cavity 230 of the liquid cooling component 2, and has good temperature uniformity performance.

[0054] In one embodiment, the first through hole 231 and the second through hole 232 are connected, and the first through hole 231 and the second through hole 232 are connected perpendicularly or obliquely in the first direction X, without particular limitation. In another embodiment, the first through hole 231 and the second through hole 232 are spaced apart along the first direction X. It can be understood that the first through hole 231 and the second through hole 232 are offset in the first direction X, and they are not connected to each other.

[0055] The distance between the inner wall of the through hole 23 and the axis of the through hole 23 decreases in the first direction X along the direction away from the body part 210.

[0056] like Figure 10 As shown, the main body 210 includes a first support plate 221 and a second support plate 222. The first support plate 221 is disposed on the side of the second support plate 222 near the first side plate 211 in the first direction X. The second support plate 222 is disposed on the side of the first support plate 221 near the second side plate 212 in the first direction X. The first support plate 221 is provided with a first protrusion 2201, and the second support plate 222 is provided with a second protrusion 2202.

[0057] The first support plate 221 has a first abutting portion 2211 extending along the first direction X at both ends in the third direction Z. The first abutting portion 2211 is connected to the first side plate 211. The second support plate 222 has a second abutting portion 2212 extending along the first direction X at both ends in the third direction Z. The second abutting portion 2212 is connected to the second side plate 212. The extending direction of the first abutting portion 2211 is opposite to the extending direction of the second abutting portion 2212.

[0058] The first side plate 211 has fixed plates 2111 extending along the second direction Y at both ends in the third direction Z. The second side plate 212 is connected to the fixed plates 2111 at each end in the third direction Z. The fixed plates 2111 are connected to the first abutting part 2211 and the second abutting part 2212 to enhance the structural strength of the liquid cooling component 2.

[0059] In one embodiment, when the first abutment portion 2211 connected to the first support plate 221 is a plate-shaped structure, the first abutment portion 2211 is connected to the first side plate 211 to form a first liquid cooling cavity 2301. When the second support plate 222 connected to the second abutment portion 2212 is a plate-shaped structure, the second abutment portion 2212 is connected to the second side plate 212 to form a second liquid cooling cavity 2302. In another embodiment, when the first support plate 221 is connected to multiple spaced first abutment portions 2211, the first abutment portions 2211, the first side plate 211, and the fixing plate 2111 cooperate to form the first liquid cooling cavity 2301. When the second support plate 222 is connected to multiple spaced second abutment portions 2212, the second abutment portions 2212, the second side plate 212, and the fixing plate 2111 cooperate to form the second liquid cooling cavity 2302.

[0060] The first support plate 221, the second support plate 222 and the fixing plate 2111 mentioned above can be fixed and sealed by ultrasonic welding.

[0061] The first support plate 221 and the first protrusion 2201 are integrally formed, and the second support plate 222 and the second protrusion 2202 are integrally formed, which improves the assembly effect and saves production costs.

[0062] In some embodiments, such as Figure 11 As shown, the main body 210 has a mounting hole 24 along the second direction Y, and the elastic part 220 passes through the mounting hole 24 and protrudes from both sides of the main body 210 along the first direction X. Therefore, the main body 210 and the elastic part 220 can be made of different materials to save production costs. The main body 210 can be made of a material with high rigidity, such as a metal, while the elastic part 220 can be made of a material with high elasticity, such as a non-metallic material.

[0063] like Figure 4 as well as Figures 12 to 15 As shown, adjacent battery cells 1 along the second direction Y are provided with a spacer 10. The support member 22 includes a first part 111 and a second part 112 connected along the second direction Y. The first part 111 is provided with an elastic portion 220. The first sidewall 11 is correspondingly arranged with the first part 111 in the first direction X, and the spacer 10 is correspondingly arranged with the second part 112 in the first direction X. Since multiple elastic portions 220 are arranged only in the first part 111, while no elastic portions 220 are arranged in the second part 112, the flow rate of the liquid cooling medium can be increased, thereby improving the cooling efficiency.

[0064] The aforementioned "space 10" refers to the distance between two adjacent battery cells 1 in the second direction Y.

[0065] The minimum distance between the first part 111 and the first sidewall 11 in the first direction X is H1 mm, and the distance between the second part 112 and the first sidewall 11 in the first direction X is H2 mm. H1 and H2 satisfy: H1 < H2. This can increase the flow rate of the liquid cooling medium and improve the cooling efficiency.

[0066] It should be noted that "the minimum distance between the first part 111 and the first sidewall 11 in the first direction X" is the minimum distance between the outer surface of the elastic part 220 and the first sidewall 11 of the battery cell 1. "The minimum distance between the second part 112 and the first sidewall 11 in the first direction X" is the distance between the first side plate 211 or the second side plate 212 and the first sidewall 11 of the battery cell 1.

[0067] like Figures 16 to 18 As shown, the battery pack 100 also includes current collectors 3, which are disposed at both ends of the liquid cooling component 2 in the second direction Y. Each current collector 3 is provided with a current collection chamber 30 communicating with the liquid cooling chamber.

[0068] like Figures 17 to 18 As shown, the battery pack 100 also includes a partition plate 301, which is disposed in the current collection cavity 30 and divides the current collection cavity 30 into multiple partition channels 302. The multiple partition channels 302 of the partition plate 301 are all connected to the liquid cooling cavity.

[0069] Multiple partition plates 301 are spaced apart in the collection cavity 30, which can effectively disperse and collect the liquid cooling medium when it flows into or out of the collector 3.

[0070] There is a gap between the partition plate and the support member 22 in the second direction Y. When the liquid cooling medium flows out of the collector 3 in parallel under the constraint of the partition plate, the liquid cooling medium can quickly pass through the collector 3 into the liquid cooling component 2 under a certain pressure. The purpose of dispersing the liquid cooling medium is to make the liquid cooling medium flow into the liquid cooling cavity evenly, so as to effectively improve the temperature uniformity of the liquid cooling component 2.

[0071] like Figures 17 to 18As shown, the current collector 3 includes a first current collector plate 311, a second current collector plate 312, and a connecting plate 313. The first current collector plate 311 and the second current collector plate 312 are arranged opposite each other along the first direction X. The two ends of the connecting plate 313 in the first direction X are respectively connected to the first current collector plate 311 and the second current collector plate 312. The first current collector plate 311, the second current collector plate 312, and the connecting plate 313 cooperate to form a current collection cavity 30. The two ends of the partition plate 301 in the first direction X are respectively connected to the first current collector plate 311 and the second current collector plate 312 to divide the current collection cavity 30 into multiple partitioned flow channels 302. This allows the liquid cooling medium, after being constrained by the partition plate, to flow out of the current collector 3 and, under a certain pressure, quickly transition to the liquid cooling component 2 through the current collector 3. The purpose of dispersing the liquid cooling medium is to enable the liquid cooling medium to flow evenly into the liquid cooling cavity, thereby effectively improving the temperature uniformity of the liquid cooling component 2.

[0072] The current collector 3 has a current collecting hole 303, which passes through the first current collecting plate 311 and the second current collecting plate 312 and is located on the side away from the battery cell 1 in the second direction Y.

[0073] like Figure 4 As shown, the battery pack 100 also includes a water pipe 6, which passes through multiple collection holes 303 to connect multiple liquid cooling components 2.

[0074] The water pipe 6 can adopt a corrugated pipe structure, which can effectively absorb the displacement of the liquid cooling component 2 caused by the expansion of the battery cell 1. The connection method between the water pipe 6 and the current collector 3 is not limited; it can be a quick-connect connection, or the water nozzle can be welded to the connection port of the current collector 3, and then the water pipe 6 can be pressed into the water nozzle using a cold pressing method. However, the cold pressing method requires that the current collector 3 be made of metal so that it can be welded to the water nozzle.

[0075] like Figures 17 to 18 As shown, the partition plate 301 includes a first sub-partition plate 3011, a second sub-partition plate 3012 and a third sub-partition plate 3013. The first sub-partition plate 3011 is disposed on the side close to the connecting plate 313 in the third direction Z, and the second sub-partition plate 3012 is disposed between the first sub-partition plate 3011 and the third sub-partition plate 3013 in the third direction Z.

[0076] The second sub-partition plate 3012 includes a first partition segment 30121 and a second partition segment 30122 connected along the second direction Y. The first partition segment 30121 is disposed between the first sub-partition plate 3011 and the third sub-partition plate 3013 in the third direction Z. The second partition segment 30122 is disposed close to the flow collection hole 303 relative to the first partition segment 30121. The third sub-partition plate 3013 includes a third partition segment 30131, a fourth partition segment 30132 and a fifth partition segment 30133. The third partition segment 30131 and the fourth partition segment 30132 are spaced apart in the third direction Z. The two ends of the fifth partition segment 30133 are respectively connected to the third partition segment 30131 and the fourth partition segment 30132 and enclose to form a third sub-partition plate 3013 with an opening 30130. The opening 30130 faces away from the flow collection hole 303, that is, the opening 30130 faces the flow channel cavity 230.

[0077] Therefore, when the liquid cooling medium enters the manifold 30, under the action of multiple partition plates 301, the liquid cooling medium can be evenly distributed into each partition channel 302. In this way, the liquid cooling medium is transferred to the liquid cooling component 2 through the manifold 3. The purpose of dispersing the liquid cooling medium is to enable the liquid cooling medium to flow evenly into the liquid cooling cavity, so as to effectively improve the temperature uniformity of the liquid cooling component 2.

[0078] The battery pack 100 has a reference plane perpendicular to the third direction Z and intersecting with the axis of the collection hole 303. The vertical distance between the first dividing segment 30121 and the reference plane is D1, and the vertical distance between the second dividing segment 30122 and the reference plane is D2. D1 and D2 satisfy the condition that D2 < D1. This allows the dividing flow channel 302 to converge towards the side of the collection hole 303 and to be parallel towards the side of the liquid cooling component 2, resulting in an overall streamlined shape. Therefore, after the current collector 3 is connected to the liquid cooling component 2, the liquid cooling medium can flow evenly into the liquid cooling cavity after passing through the current collector 3, effectively improving the temperature uniformity of the liquid cooling component 2.

[0079] The connecting plate 313 includes two first sub-connecting plates 3131 disposed opposite to each other in the third direction Z, and an arc plate 3132 connected between the two first sub-connecting plates 3131. The arc plate 3132 can be made up of multiple curved plates connected together.

[0080] The first sub-connecting plate 3131 is provided with a socket structure 3130 at the connection end with the liquid cooling component 2. This socket structure 3130 can be inserted into the flow channel cavity 230 to realize the connection between the current collector 3 and the liquid cooling component 2. To improve the connection stability between the current collector 3 and the liquid cooling component 2, laser welding can be performed at the connection between the current collector 3 and the liquid cooling component 2.

[0081] Figure 2Two manifolds 3 are illustrated, namely the first manifold 31 and the second manifold 32. The first manifold 31 has one end of the liquid cooling component 2 in the second direction Y, and the second manifold 32 has the other end of the liquid cooling component 2 in the second direction Y. The water pipe 6 connected to the first manifold 31 is the inlet pipe, and the water pipe 6 connected to the second manifold 32 is the outlet pipe. Therefore, when the liquid cooling system is working, the liquid cooling medium flows into the first manifold 31 from the inlet pipe. Through the action of the partition plate 301 inside the first manifold 31, the liquid cooling medium is evenly distributed into each partition channel 302 and flows into the liquid cooling cavity. When the battery cell 1 expands due to heat, the first sidewall 11 of the battery cell 1 presses against the first side plate 211 and / or the second side plate 212 of the liquid cooling component 2, causing the first side plate 211 and / or the second side plate 212 to compress and deform towards the support member 22. Ultimately, the elastic part 220 can abut and support the first side plate 211 and / or the second side plate 212 to absorb the expansion force generated by the battery cell 1. Furthermore, a liquid cooling channel for the flow of liquid cooling medium still exists between the first side plate 211 and / or the second side plate 212 and the body part 210 of the support member 22 to cool the battery cell 1. Simultaneously, because the flow channel cavity 230 is compressed, the liquid cooling medium accelerates its flow rate under the same preset pressure, achieving rapid cooling of the battery cell 1 to ensure temperature uniformity. After the liquid cooling medium flows out of the liquid cooling cavity, it converges into the second current collector 32, then flows to the outlet pipe, and finally is discharged from the outlet pipe.

[0082] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0083] The battery pack and power device provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery pack, characterized in that, The battery pack has a first direction, a second direction, and a third direction that intersect each other in pairs. The battery pack includes: Multiple battery cells are arranged along the first direction; and, A liquid cooling component is disposed on at least one side of the battery cell along the first direction. The liquid cooling component includes a first side plate, a second side plate, and a support member. The first side plate and the second side plate are disposed opposite to each other in the first direction and enclose a flow channel cavity. The support member is connected between the first side plate and the second side plate in the first direction to divide the flow channel cavity into two liquid cooling cavities arranged along the first direction. The first side plate and / or the second side plate are thermally connected to the battery cell. The support member includes a body portion and an elastic portion. The body portion is disposed between the first side plate and the second side plate in the first direction. The body portion has an elastic portion that protrudes along the first direction on at least one side in the first direction. The elastic portion is connected to the first side plate or the second side plate. The support member has a through hole along the first direction. The through hole penetrates the body portion and the elastic portion to connect the two liquid cooling cavities.

2. The battery pack according to claim 1, characterized in that, The elastic portion includes a first protrusion and a second protrusion. The first protrusion protrudes toward the first side plate relative to the body portion, and the second protrusion protrudes toward the second side plate relative to the body portion. At least one of the first protrusion and the first side plate, and the second protrusion and the second side plate, is provided with a gap. The through hole includes a first through hole and a second through hole, the first through hole penetrating the first protrusion along the first direction, and the second through hole penetrating the second protrusion along the second direction.

3. The battery pack according to claim 2, characterized in that, The first through hole and the second through hole are connected, or the first through hole and the second through hole are spaced apart along the first direction.

4. The battery pack according to claim 2, characterized in that, The main body includes a first support plate and a second support plate. The first support plate is disposed on the side of the second support plate near the first side plate in the first direction. The second support plate is disposed on the side of the first support plate near the second side plate in the first direction. The first support plate is provided with a first protrusion, and the second support plate is provided with a second protrusion.

5. The battery pack according to claim 4, characterized in that, The first support plate has a first abutting portion extending along the first direction at both ends of the third direction, and the first abutting portion is connected to the first side plate. The second support plate has a second abutting portion extending along the first direction at both ends of the third direction, and the second abutting portion is connected to the second side plate. The extension direction of the first abutting portion is opposite to the extension direction of the second abutting portion.

6. The battery pack according to claim 5, characterized in that, The first side plate has fixing plates extending along the second direction at both ends of the third direction, and the second side plate is connected to the fixing plates at each end of the third direction. The fixing plate is connected to both the first abutting part and the second abutting part.

7. The battery pack according to claim 4, characterized in that, The first support plate and the first protrusion are integrally formed, and the second support plate and the second protrusion are integrally formed.

8. The battery pack according to claim 1, characterized in that, The main body has a mounting hole along the second direction, and the elastic part passes through the mounting hole and protrudes from both sides of the main body along the first direction.

9. The battery pack according to claim 1, characterized in that, The distance between the inner wall of the through hole and the axis of the through hole decreases in the first direction in the direction away from the body portion.

10. The battery pack according to claim 1, characterized in that, The battery pack also includes: The plurality of elastic portions are arranged in the second direction and the third direction upward, and at least two adjacent elastic portions are misaligned in the second direction and / or the third direction.

11. The battery pack according to claim 1, characterized in that, The battery cell has a first sidewall disposed opposite to each other along the first direction and a second sidewall disposed opposite to each other along the second direction. The first sidewall and the second sidewall are connected. The surface area of ​​the second sidewall is smaller than the surface area of ​​the first sidewall. The first sidewall is thermally connected to the first side plate or the second side plate.

12. The battery pack according to claim 11, characterized in that, The battery cells adjacent to each other along the second direction are provided with a space between them. The support member includes a first part and a second part connected along the second direction. The first part is provided with the elastic part. The first sidewall is provided with the first part in the first direction. The space between them is provided with the second part in the first direction. The minimum distance between the first part and the first sidewall in the first direction is H1 mm, and the distance between the second part and the first sidewall in the first direction is H2 mm. H1 and H2 satisfy: H1 < H2.

13. The battery pack according to claim 1, characterized in that, The battery pack also includes: A current collector is disposed at both ends of the liquid cooling component in the second direction; the current collector is provided with a collection cavity communicating with the liquid cooling cavity; A partition plate is disposed in the flow collection cavity and divides the flow collection cavity into multiple partition channels, and the multiple partition channels of the partition plate are all connected to the liquid cooling cavity.

14. The battery pack according to claim 13, characterized in that, The current collector includes a first current collector plate, a second current collector plate, and a connecting plate. The first current collector plate and the second current collector plate are arranged opposite to each other along the first direction. The two ends of the connecting plate in the first direction are respectively connected to the first current collector plate and the second current collector plate. The first current collector plate, the second current collector plate, and the connecting plate cooperate to form the current collection cavity. The two ends of the partition plate in the first direction are respectively connected to the first current collector plate and the second current collector plate.

15. The battery pack according to claim 14, characterized in that, The current collector has a current collecting hole that penetrates the first current collecting plate and the second current collecting plate and is located on the side away from the battery cell in the second direction; The partition plate includes a first sub-partition plate, a second sub-partition plate, and a third sub-partition plate. The first sub-partition plate is disposed on the side close to the connecting plate in the third direction, and the second sub-partition plate is disposed between the first sub-partition plate and the third sub-partition plate in the third direction. The second sub-divider plate includes a first dividing segment and a second dividing segment connected along the second direction. The first dividing segment is disposed between the first sub-divider plate and the third sub-divider plate in the third direction. The second dividing segment is disposed close to the flow collection hole relative to the first dividing segment. The third sub-divider plate includes a third dividing segment, a fourth dividing segment, and a fifth dividing segment. The third dividing segment and the fourth dividing segment are spaced apart in the third direction. The two ends of the fifth dividing segment are respectively connected to the third dividing segment and the fourth dividing segment and enclose each other to form the third sub-divider plate with an opening facing away from the flow collection hole.

16. The battery pack according to claim 15, characterized in that, The battery pack has a reference plane perpendicular to the third direction and intersecting with the axis of the collector hole. The vertical distance between the first dividing segment and the reference plane is D1, and the vertical distance between the second dividing segment and the reference plane is D2. D1 and D2 satisfy the condition that D2 < D1.

17. An electrical device, characterized in that, The device includes a battery pack as described in any one of claims 1 to 16, wherein the battery pack supplies power to the electrical device.

Images