Battery and electric device

Abstract

The utility model relates to a battery and a power utilization device, and belongs to the technical field of battery manufacturing. The battery includes: a case; the liquid cooling plate is arranged in the box body in the Z direction and divides the interior of the box body into at least two placement spaces, and the Z direction is the height direction of the box body; the plurality of single batteries are arranged in the placement space; and the confluence sheet is electrically connected with two adjacent single batteries, and the confluence sheet is in heat conduction fit with the liquid cooling plate so as to take away heat generated in the charging and discharging process of the single batteries. The utility model further provides a power utilization device which comprises the battery. The liquid cooling plate can quickly take away heat generated in the charging and discharging process of the battery monomers, so that the liquid cooling plate has relatively high safety performance.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and more specifically, to a battery and an electrical device. Background Technology

[0002] With the rapid development of the new energy field, lithium batteries have advantages such as high energy density, high voltage, and environmental friendliness. In recent years, they have gradually replaced traditional energy industries, and the manufacturing level has developed rapidly, which has put forward higher requirements for safety performance.

[0003] During rapid charging and discharging, individual battery cells generate heat, causing the battery pack temperature to rise rapidly. Battery packs typically incorporate a thermal management system to cool the individual cells and dissipate the heat generated during charging and discharging. Improving the heat exchange performance of this thermal management system has become a pressing technical challenge. Utility Model Content

[0004] Therefore, this application proposes a battery and an electrical device that can quickly dissipate the heat generated by individual battery cells during charging and discharging, and has high safety performance.

[0005] The battery according to a first aspect embodiment of this application includes: a housing; a liquid cooling plate disposed inside the housing along the Z direction and dividing the interior of the housing into at least two placement spaces, wherein the Z direction is the height direction of the housing; a plurality of battery cells disposed in the placement spaces; and a busbar electrically connecting two adjacent battery cells, wherein the busbar is thermally bonded to the liquid cooling plate to remove the heat generated by the battery cells during charging and discharging.

[0006] Optionally, the battery cell includes a first side, which faces the liquid cooling plate. The first side is provided with a positive terminal and a negative terminal. The busbar electrically connects the positive terminal of one battery cell to the negative terminal of another adjacent battery cell.

[0007] Optionally, the surface of the liquid cooling plate is provided with a heat-conducting layer, and the busbar is thermally bonded to the liquid cooling plate through the heat-conducting layer.

[0008] Optionally, the liquid cooling plate has a water inlet and a water outlet, and the interior of the liquid cooling plate has a bent and extended heat exchange channel, which is connected to the water inlet and the water outlet respectively. The water inlet and the water outlet are located on the same side in the X direction, where the X direction is the length direction of the housing. The battery also includes a water inlet pipe and a water outlet pipe, with the water inlet pipe connected to the water inlet and the water outlet pipe connected to the water outlet.

[0009] Optionally, the liquid cooling plate has a spray chamber inside, and the spray chamber is filled with a cooling and fire extinguishing medium. When the battery cell experiences thermal runaway, the cooling and fire extinguishing medium in the spray chamber is sprayed out to prevent the thermal runaway from spreading. The spray chamber extends along the X direction, and the heat exchange channels are arranged on both sides of the spray chamber along the Z direction.

[0010] Optionally, two spray chambers are provided, and the two spray chambers are arranged opposite each other along the Y direction, where the Y direction is the width direction of the box body.

[0011] Optionally, the liquid cooling plate includes two side plates on both sides along the Y direction, and the wall thickness of each side plate at the spray chamber is less than the wall thickness at the heat exchange channel; the battery cell includes a first side, which faces the liquid cooling plate, and the first side is provided with an explosion-proof valve, which is correspondingly provided with the spray chamber.

[0012] Optionally, the liquid cooling plate divides its interior into two placement spaces along the Y direction, and the two sides of the liquid cooling plate along the Y direction are respectively thermally bonded to the busbar of the battery cell in the corresponding placement space.

[0013] Optionally, the housing also has a partition that divides its interior into two cavities along the X direction, and the liquid cooling plate is used to divide one of the cavities into two placement spaces.

[0014] The electrical device according to the second aspect of this application includes the battery described in the first aspect of this application, the battery being used to provide electrical energy to the electrical device.

[0015] Compared with existing technologies, this solution has the following advantages:

[0016] In the battery of this application embodiment, the battery cells are electrically connected through a busbar. During the charging and discharging process, the busbar heats up due to the current. The liquid cooling plate is thermally bonded to the busbar and cools the busbar through the liquid cooling plate. This can remove the heat generated by the battery cells during charging and discharging in a timely manner, thus providing high safety performance.

[0017] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a first-view structural schematic diagram of a battery provided in an embodiment of this application;

[0020] Figure 2 This is a structural schematic diagram of a battery from a second perspective, provided in an embodiment of this application.

[0021] Figure 3 for Figure 2 AA cross-section view;

[0022] Figure 4 for Figure 3 A magnified view of a section at point B in the middle;

[0023] Figure 5 A cross-sectional view of the liquid cooling plate of the battery provided in the embodiments of this application, which has two spray chambers;

[0024] Figure 6 This is a schematic diagram of the structure of the liquid cooling plate of the battery provided in an embodiment of this application;

[0025] Figure 7 A schematic diagram of the structure of the liquid cooling plate of the battery provided in the embodiment of this application, which has a heat-conducting layer;

[0026] Figure 8 A schematic diagram of the heat exchange channel arrangement of the liquid cooling plate of the battery provided in the embodiments of this application;

[0027] Figure 9 This is a schematic diagram of the structure of a single battery cell provided in an embodiment of this application.

[0028] Icons: 100-Battery; 110-Box; 111-Placement space; 112-First chamber; 113-Second chamber; 120-Liquid cooling plate; 121-First side plate; 122-Second side plate; 123-Heat-conducting layer; 124-Heat exchange channel; 125-Spray chamber; 126-Water inlet; 127-Water outlet; 130-Battery cell; 131-First side; 1311-Positive terminal; 1312-Negative terminal; 1313-Explosion-proof valve; 140-Bucket; 150-Separator; 151-Through hole. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, 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. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0031] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments of this application, the battery 100 includes a housing 110, a liquid cooling plate 120, a plurality of battery cells 130, and a busbar 140. The liquid cooling plate 120 is disposed inside the housing 110 along the Z direction and divides the interior of the housing 110 to form at least two placement spaces 111, where the Z direction is the height direction of the housing 110; the plurality of battery cells 130 are disposed in the placement spaces 111; the busbar 140 electrically connects two adjacent battery cells 130, and the busbar 140 is thermally bonded to the liquid cooling plate 120 to dissipate the heat generated by the battery cells 130 during charging and discharging.

[0032] The length of the enclosure 110 extends along the X direction, the width extends along the Y direction, and the height extends along the Z direction; the liquid cooling plate 120 is disposed inside the enclosure 110 along the Z direction, dividing the internal space of the enclosure 110 on the XY plane to form at least two placement spaces 111.

[0033] In the battery 100 of this application embodiment, the battery cell 130 is electrically connected through the busbar 140. During the charging and discharging process, the busbar 140 of the battery cell 130 generates heat due to the current. The liquid cooling plate 120 is thermally bonded to the busbar 140, and the busbar 140 is cooled by the liquid cooling plate 120. This can remove the heat generated by the battery cell 130 during charging and discharging in a timely manner, and has high safety performance.

[0034] In some embodiments of this application, the liquid cooling plate 120 divides its interior along the Y direction to form two placement spaces 111, and the two sides of the liquid cooling plate 120 along the Y direction are thermally bonded to the busbars 140 of the battery cells 130 in the corresponding placement spaces 111.

[0035] Specifically, a liquid cooling plate 120 is provided, extending along the X direction in its length direction and dividing the interior of the housing 110 into two placement spaces 111 in the Y direction. The liquid cooling plate 120 includes a first side plate 121 and a second side plate 122 on its two sides in the Y direction. The first side plate 121 is thermally bonded to the busbar 140 of the battery cell 130 in the placement space 111 on the same side, and the second side plate 122 is thermally bonded to the busbar 140 of the battery cell 130 in the placement space 111 on the same side.

[0036] With this configuration, the first side plate 121 and the second side plate 122 of the liquid cooling plate 120 can be used to cool the manifold 140 respectively. Since the surface of the liquid cooling plate 120 is fully utilized for heat exchange, the heat exchange efficiency of the liquid cooling plate 120 is improved.

[0037] In other embodiments, multiple liquid cooling plates 120 may be used to divide the interior of the housing 110 along the X direction to form multiple placement spaces 111, etc.

[0038] like Figure 9 As shown, in some embodiments of this application, the battery cell 130 includes a first side 131, which is disposed facing the liquid cooling plate 120. The first side 131 is provided with a positive terminal 1311 and a negative terminal 1312. The busbar 140 electrically connects the positive terminal 1311 of one battery cell 130 and the negative terminal 1312 of another adjacent battery cell 130.

[0039] In other words, the positive terminal 1311 and negative terminal 1312 of the battery cell 130 are arranged on the same side, and the busbar 140 is electrically connected to the positive terminal 1311 and negative terminal 1312 of two adjacent battery cells 130 from the same side of the battery cell 130. The busbar 140 is attached to the first side plate 121 or the second side plate 122 of the liquid cooling plate 120.

[0040] Specifically, the side of the battery cell 130 along the Y direction is the first side 131, the thickness direction of the liquid cooling plate 120 extends along the Y direction, and the battery cell 130 is arranged in a side-lying position in the placement space 111.

[0041] This configuration shortens the conductive path of the busbar 140 and increases the contact area between the busbar 140 and the liquid cooling plate 120, thereby improving the cooling effect of the busbar 140.

[0042] In other embodiments, the positive terminal 1311 and negative terminal 1312 of the battery cell 130 may also be disposed on other sidewalls of the battery cell 130, and a portion of the busbar 140 is attached to the liquid cooling plate 120.

[0043] like Figure 4and Figure 8 As shown, in some embodiments of this application, the liquid cooling plate 120 is provided with a spray chamber 125 inside, and the spray chamber 125 is filled with a cooling and fire extinguishing medium. When the battery cell 130 experiences thermal runaway, the cooling and fire extinguishing medium in the spray chamber 125 is sprayed out to prevent the thermal runaway from spreading. The spray chamber 125 extends along the X direction, and heat exchange channels 124 are arranged on both sides of the spray chamber 125 in the Z direction.

[0044] like Figure 8 As shown, the heat exchange channel 124 extends along the X direction and has an overall U-shaped structure. The spray chamber 125 is located between the two heat exchange channels 124 in the Z direction.

[0045] With this configuration, the high-temperature and high-pressure material ejected when the battery cell 130 experiences thermal runaway can melt the liquid cooling plate 120, thereby releasing the cooling and extinguishing medium in the spray chamber 125 and preventing the spread of thermal runaway.

[0046] In other embodiments, the heat exchange channel 124 may also be a U-shaped structure with multiple bends; the channel direction may also extend along the Z direction, and the entire liquid cooling plate 120 may be covered with other bends.

[0047] like Figure 5 As shown, in some embodiments of this application, two spray chambers 125 are provided, and the two spray chambers 125 are arranged opposite each other along the Y direction, which is the width direction of the box body 110.

[0048] In the thickness direction (i.e., the Y direction) of the liquid cooling plate 120, the two spray chambers 125 are separated by internal side plates.

[0049] With this configuration, when the first side plate 121 and the second side plate 122 melt, the cooling and extinguishing medium in the spray chamber 125 on the same side can be released respectively, thereby preventing the thermal runaway of the battery cells 130 in the two placement spaces 111 from continuing to spread.

[0050] like Figure 4 As shown, in some other embodiments of this application, only one spray chamber 125 is provided. The spray chamber 125 is disposed between two heat exchange channels 124 in the Z direction and between the first side plate 121 and the second side plate 122 in the Y direction.

[0051] like Figure 4As shown, in some embodiments of this application, the liquid cooling plate 120 includes two side plates on both sides along the Y direction, and the wall thickness of each of them at the spray chamber 125 is less than the wall thickness at the heat exchange channel 124; the battery cell 130 includes a first side 131, which is disposed facing the liquid cooling plate 120, and the first side 131 is provided with an explosion-proof valve 1313, which is disposed corresponding to the spray chamber 125.

[0052] Taking the first side plate 121 as an example, the wall thickness of the first side plate 121 at the heat exchange channel 124 is D1, and the wall thickness at the spray chamber 125 is D2, where D2 < D1. When the battery cell 130 experiences thermal runaway, the side wall at the spray chamber 125 is prone to melt, thereby releasing the internal cooling and extinguishing medium.

[0053] An explosion-proof valve 1313 is provided on the first side 131 of the battery cell 130. Along the Z direction, the explosion-proof valve 1313 is located between the positive terminal 1311 and the negative terminal 1312, and is correspondingly positioned to correspond with the spray chamber 125. On the one hand, when the battery cell 130 experiences thermal runaway, the explosion-proof valve 1313 sprays a high-temperature and high-pressure medium into the spray chamber 125, which easily melts the side wall of the spray chamber 125. On the other hand, the cooling and extinguishing medium released by the spray chamber 125 cools and extinguishes the explosion-proof valve 1313, thereby quickly and effectively preventing the spread of thermal runaway.

[0054] like Figure 6 As shown, in some embodiments of this application, the liquid cooling plate 120 is provided with a water inlet 126 and a water outlet 127. The interior of the liquid cooling plate 120 is provided with a bent and extended heat exchange channel 124, which is connected to the water inlet 126 and the water outlet 127 respectively. The water inlet 126 and the water outlet 127 are located on the same side in the X direction, which is the length direction of the housing 110. The battery 100 also includes a water inlet pipe and a water outlet pipe, with the water inlet pipe connected to the water inlet 126 and the water outlet pipe connected to the water outlet 127.

[0055] The water inlet 126 and the water outlet 127 are located on the same side of the liquid cooling plate 120 in the X direction, which facilitates the connection between the liquid cooling plate 120 and the water inlet pipe and the water outlet pipe; the heat exchange channel 124 is bent and extended, which can increase the length of the heat exchange channel 124 inside the liquid cooling plate 120 with a limited volume, thereby improving the cooling effect of the liquid cooling plate 120.

[0056] In other embodiments, the water inlet 126 and the water outlet 127 may also be located at other parts of the liquid cooling plate 120.

[0057] like Figure 7 As shown, in some embodiments of this application, the surface of the liquid cooling plate 120 is provided with a heat-conducting layer 123, and the busbar 140 is thermally bonded to the liquid cooling plate 120 through the heat-conducting layer 123.

[0058] The heat-conducting layer 123 is disposed on two sides of the liquid cooling plate 120 in the Y direction. The material of the heat-conducting layer 123 can be ceramic heat-conducting powder, silicone elastomer, etc. The heat-conducting layer 123 can be disposed on the outer surface of the first side plate 121 and the second side plate 122 by means of adhesion or coating. The heat-conducting layer 123 can completely cover the first side plate 121 and the second side plate 122, or it can only cover the part of the first side plate 121 and the second side plate 122 that is in contact with the busbar 140. The heat-conducting layer 123 can cover the side wall corresponding to the spray cavity 125 to form a large continuous area. Alternatively, a local heat-conducting layer 123 can be independently disposed at the contact point of each busbar 140.

[0059] With this configuration, the gap between the liquid cooling plate 120 and the busbar 140 can be filled by the heat-conducting layer 123, thereby improving the cooling effect of the liquid cooling plate 120 on the busbar 140.

[0060] In some embodiments of this application, the housing 110 also has a partition 150 inside, which divides its interior into two cavities along the X direction, and the liquid cooling plate 120 is used to divide one of the cavities into two placement spaces 111.

[0061] like Figure 1 and Figure 2 As shown, the partition 150 divides the interior of the housing 110 along the X direction to form a first cavity 112 and a second cavity 113. The liquid cooling plate 120 is disposed in the second cavity 113 to divide the second cavity 113 into two placement spaces 111. The partition 150 is provided with a through hole 151. The water inlet pipe and the water outlet pipe are disposed in the first cavity 112. The water inlet pipe and the water outlet pipe pass through the through hole 151 and enter the second cavity 113 from the first cavity 112, respectively, and are connected to the water inlet part 126 and the water outlet part 127. The other end passes through the first cavity 112 and exits the outside of the housing 110 to connect with an external water source. The first cavity 112 can also be used to place electrical devices, etc.

[0062] With this configuration, the interior of the housing 110 can be divided into two chambers. The second chamber 113 houses the battery cell 130 and the liquid cooling plate 120, while the water inlet pipe, water outlet pipe, etc., which are connected to the outside are placed in the first chamber 112. This allows the second chamber 113 to be sealed, thereby improving the safety performance of the battery 100.

[0063] Some embodiments of the present application include an electrical device, which includes a battery 100 for providing electrical energy to the electrical device.

[0064] Electrical devices can include automobiles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Automobiles can be gasoline-powered, natural gas-powered, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. 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. This application does not impose any special limitations on the above-mentioned electrical devices.

[0065] Due to the characteristics of the battery 100 in this embodiment, the electrical device in this embodiment also has good safety performance.

[0066] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0067] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery, characterized in that, include: Box (110); A liquid cooling plate (120) is disposed inside the housing (110) along the Z direction, and divides the interior of the housing (110) into at least two placement spaces (111), wherein the Z direction is the height direction of the housing (110); Multiple battery cells (130) are disposed in the placement space (111). The busbar (140) electrically connects two adjacent battery cells (130). The busbar (140) is thermally bonded to the liquid cooling plate (120) to remove the heat generated by the battery cells (130) during charging and discharging.

2. The battery according to claim 1, characterized in that, The battery cell (130) includes a first side (131) facing the liquid cooling plate (120). The first side (131) is provided with a positive terminal (1311) and a negative terminal (1312). The busbar (140) electrically connects the positive terminal (1311) of one battery cell (130) to the negative terminal (1312) of another adjacent battery cell (130).

3. The battery according to claim 1, characterized in that, The surface of the liquid cooling plate (120) is provided with a heat-conducting layer (123), and the busbar (140) is thermally bonded to the liquid cooling plate (120) through the heat-conducting layer (123).

4. The battery according to claim 1, characterized in that, The liquid cooling plate (120) is provided with a water inlet (126) and a water outlet (127). The interior of the liquid cooling plate (120) is provided with a bent and extended heat exchange channel (124). The heat exchange channel (124) is connected to the water inlet (126) and the water outlet (127) respectively. The water inlet (126) and the water outlet (127) are located on the same side in the X direction, where the X direction is the length direction of the box (110). The battery (100) also includes an inlet pipe and an outlet pipe, the inlet pipe being connected to the inlet section (126) and the outlet pipe being connected to the outlet section (127).

5. The battery according to claim 4, characterized in that, The liquid cooling plate (120) is provided with a spray chamber (125) inside. The spray chamber (125) is filled with a cooling and fire extinguishing medium. When the battery cell (130) experiences thermal runaway, the cooling and fire extinguishing medium in the spray chamber (125) is sprayed out to prevent the thermal runaway from spreading. The spray chamber (125) extends along the X direction, and the heat exchange channels (124) are arranged on both sides of the spray chamber (125) along the Z direction.

6. The battery according to claim 5, characterized in that, There are two spray chambers (125), which are arranged opposite each other along the Y direction, which is the width direction of the box body (110).

7. The battery according to claim 5, characterized in that, The liquid cooling plate (120) includes two side plates on both sides along the Y direction, and the wall thickness of each side plate at the spray chamber (125) is less than the wall thickness at the heat exchange channel (124). The battery cell (130) includes a first side (131) facing the liquid cooling plate (120). The first side (131) is provided with an explosion-proof valve (1313), which is correspondingly provided with the spray chamber (125).

8. The battery according to claim 7, characterized in that, The liquid cooling plate (120) divides its interior along the Y direction to form two placement spaces (111). The liquid cooling plate (120) is thermally bonded to the busbar (140) of the battery cell (130) in the corresponding placement space (111) on both sides along the Y direction.

9. The battery according to claim 8, characterized in that, The housing (110) also has a partition (150) inside, which divides its interior into two cavities along the X direction, and the liquid cooling plate (120) is used to divide one of the cavities into two placement spaces (111).

10. An electrical device, characterized in that, Includes a battery (100) as described in any one of claims 1 to 9, the battery (100) being used to provide electrical energy to the electrical device.

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