Battery box with integrated liquid cooling function and battery pack thereof

Abstract

The present invention relates to the field of battery technology, and discloses a battery box body and a battery pack with integrated liquid cooling function, including a liquid cooling base plate, wherein the upper surface of the liquid cooling base plate is provided with a plurality of bosses extending in the horizontal direction, and any two adjacent bosses are arranged at intervals, and the upper surface of the plurality of bosses is used for placing a battery cell stack after applying thermal conductive glue, and the battery cell stack comprises a plurality of battery cells stacked on each other and a buffer component arranged between two adjacent battery cells, the stacking direction of the battery cells is the same as the arrangement direction of the bosses, and the buffer component between each adjacent battery cell corresponds to a groove formed between each adjacent boss, so that it is avoided to apply a layer of thermal conductive glue on the entire upper surface of the liquid cooling base plate, thereby reducing the use of thermal conductive glue; the interior of the liquid cooling base plate is also provided with a plurality of liquid cooling shunt channels which are interconnected and used to enter the liquid cooling medium, and the plurality of liquid cooling shunt channels correspond one-to-one with the plurality of bosses, so that the liquid cooling medium is cooled in a targeted manner, thereby improving the cooling rate of the battery pack.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a battery box with integrated liquid cooling function and a battery pack thereof. Background Art

[0002] The battery case is an important structural component of the battery pack, responsible for supporting and sealing the battery structure. The bottom plate of the existing battery case is generally flat, and the cells of the battery cell stack in the battery pack are not placed directly on the upper surface of the bottom plate of the battery case. Instead, a layer of thermal conductive glue is first applied to the upper surface of the bottom plate of the battery case, and then the cells are placed to eliminate the gap between the bottom plate and the cells. However, a buffer component, such as foam or aerogel, needs to be set between the cells to absorb the expansion and isolate the heat between adjacent cells. Since the buffer component itself does not need to be cooled, the thermal conductive glue under the buffer component is wasted. Summary of the invention

[0003] One of the main purposes of the present invention is to provide a battery pack case and a battery pack with integrated liquid cooling function, which effectively avoids coating thermal conductive adhesive at the position of the bottom plate of the battery case corresponding to the buffer component arranged between two adjacent battery cells, which not only saves the use of thermal conductive adhesive but also improves the cooling rate of the battery pack.

[0004] In order to achieve the above-mentioned invention objectives, the first aspect of the present invention proposes a battery box with integrated liquid cooling function, including a liquid cooling base plate, the upper surface of the liquid cooling base plate is provided with a plurality of bosses extending in the horizontal direction, any two adjacent bosses are arranged at intervals, the upper surfaces of the plurality of bosses are coated with thermal conductive adhesive, a plurality of battery cells are placed on the thermal conductive adhesive, and a groove is formed between two adjacent bosses; the interior of the liquid cooling base plate is also provided with a plurality of liquid cooling shunt channels that are interconnected and used to enter liquid cooling medium, and the plurality of liquid cooling shunt channels correspond one-to-one to the plurality of bosses.

[0005] Further, each of the bosses extends along the width direction of the liquid-cooled base plate, and multiple bosses are arranged at intervals along the length direction of the liquid-cooled base plate; or, each of the bosses extends along the length direction of the liquid-cooled base plate, and multiple bosses are arranged at intervals along the width direction of the liquid-cooled base plate.

[0006] Furthermore, the liquid-cooled base plates are provided in plurality, and a partition plate is sealed between two adjacent liquid-cooled base plates, and a partition flow channel is provided inside the partition plate, and the partition flow channel connects the liquid-cooled shunt channel between the two adjacent liquid-cooled base plates; the partition plate is a partition area of ​​the battery cell stack placed on the two liquid-cooled base plates.

[0007] Furthermore, the liquid-cooling shunt channel runs through a first side and a second side of the liquid-cooling bottom plate that are oppositely arranged, and side surfaces of the first sides of two adjacent liquid-cooling bottom plates are sealed and connected via the spacer plate.

[0008] Furthermore, the battery box also includes two side beams, which are respectively sealed and connected to the side surfaces of the second sides of the first and last liquid-cooled bottom plates among the multiple liquid-cooled bottom plates, and a main flow channel connected to the liquid-cooled shunt channel is opened in the side beams.

[0009] Furthermore, a flow channel fork is provided on the side where the side beam is connected to the second side of the liquid cooling bottom plate, and the flow channel fork is connected to a plurality of liquid cooling branch channels; a plurality of flow channel forks are provided, and the plurality of flow channel forks are connected to the plurality of liquid cooling branch channels in a one-to-one correspondence.

[0010] Furthermore, one of the side beams is provided with a water inlet communicated with the main flow channel, and the water inlet is connected to a water inlet joint; the other side beam is provided with a water outlet communicated with the main flow channel, and the water outlet is connected to a water outlet joint.

[0011] Furthermore, the battery box also includes a front beam and a rear beam, which are respectively fixed to opposite ends of the liquid-cooled bottom plate, and the front beam and the rear beam are enclosed with the two side beams to form a receiving cavity for placing the battery cell.

[0012] Furthermore, the liquid cooling base plate and the boss are integrally formed by extrusion of metal aluminum.

[0013] Furthermore, one side of the liquid cooling bottom plate is integrally connected with a side beam extending upward along the height of the liquid cooling bottom plate, and the connection between the liquid cooling bottom plate and the side beam forms an L-shaped liquid cooling profile, and the L-shaped liquid cooling profile is integrally formed by extrusion of metal aluminum.

[0014] Furthermore, the liquid-cooling profiles are provided with two, and the side of one liquid-cooling profile facing away from the body beam is connected to the side of the other liquid-cooling profile facing away from the body beam; the interior of the liquid-cooling profile is also provided with a main flow channel connected to its liquid-cooling branch channel, and the liquid-cooling profile is also provided with a water inlet connected to the main flow channel.

[0015] Furthermore, the liquid-cooling shunt channel runs through two opposite ends of the liquid-cooling bottom plate, and the openings at the two opposite ends of the liquid-cooling bottom plate are sealed by sealing plates.

[0016] A second aspect of the present invention provides a battery pack, comprising an upper cover, a battery cell stack and the battery case described in the present invention, wherein the upper cover is connected to the battery case and covers the battery cell stack, the battery cell stack comprises a plurality of battery cells stacked on each other and a buffer component arranged between two adjacent battery cells, and the stacking direction of the battery cells is the same as the arrangement direction of the bosses.

[0017] Furthermore, the battery cells of the battery module battery cell stack are battery cells with a curling structure or a sealing edge structure, and the grooves are used to avoid the sealing edge or curling structure protruding from the battery cells.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The battery case of the present invention places a cell stack through multiple bosses on the upper surface of its liquid-cooled base plate. When placing the cell stack, a layer of thermally conductive adhesive is first applied on the upper surface of each boss, and then the battery is placed on the thermally conductive adhesive. The function of the thermally conductive adhesive is to exchange heat between the liquid-cooled base plate and the cell stack. The cell stack includes multiple stacked cells and a buffer component arranged between two adjacent cells, and the buffer component between adjacent cells corresponds to the groove formed between each adjacent boss, so that the buffer component is located in the groove, thereby avoiding the need to apply a layer of thermally conductive adhesive on the entire upper surface of the liquid-cooled base plate, thereby reducing the use of thermally conductive adhesive. At the same time, the interior of the liquid-cooled base plate is also provided with multiple liquid-cooling shunt channels that are interconnected and used to enter liquid cooling medium. The multiple liquid-cooling shunt channels correspond one-to-one with the multiple bosses, so that the liquid-cooling medium only cools the cell without cooling the buffer component arranged between two adjacent cells, so that the liquid-cooling medium has targeted cooling, thereby improving the cooling rate of the battery pack. In this way, the use of thermal conductive adhesive is saved and the cooling rate of the battery pack is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a battery box according to a first embodiment of the present invention;

[0021] Figure 2 A left side view or a right side view of a partition plate according to a first embodiment of the present invention;

[0022] Figure 3 for Figure 2 A schematic diagram of the enlarged structure at A in the middle;

[0023] Figure 4 This is a schematic diagram of the structure of the connection between the liquid cooling base plate and the boss according to the first embodiment of the present invention;

[0024] Figure 5 for Figure 4 A schematic diagram of the enlarged structure at B in the middle;

[0025] Figure 6 It is a right side view of the side beam according to the first embodiment of the present invention;

[0026] Figure 7 for Figure 6 Schematic diagram of the enlarged structure at C in the middle;

[0027] Figure 8 It is a front view of a side beam according to the first embodiment of the present invention;

[0028] Fig. 9 The structure of the battery pack according to the embodiment of the present invention is shown in FIG. Figure 1 ;

[0029] Fig.10 Fig. 9 Sectional view at DD in the middle;

[0030] Fig.11 for Fig.10 Schematic diagram of the enlarged structure at E in the middle;

[0031] Fig.12 The structure of the battery pack according to the embodiment of the present invention is shown in FIG. Figure 2 ;

[0032] Fig.13 for Fig.12 Cross-sectional view at FF;

[0033] Fig.14 for Fig.13 Schematic diagram of the enlarged structure at G in the middle;

[0034] Fig.15 An exploded view of a battery pack according to Embodiment 1 of the present invention;

[0035] Fig.16 This is a schematic diagram of the structure of the battery box according to the second embodiment of the present invention.

[0036] Fig.17 It is a front view of a liquid cooling profile according to the second embodiment of the present invention;

[0037] Fig.18 This is a schematic diagram of the three-dimensional structure of the liquid cooling profile according to the second embodiment of the present invention;

[0038] Fig.19 This is an exploded view of a battery pack according to Embodiment 2 of the present invention;

[0039] Reference numerals in the accompanying drawings:

[0040] 1. Battery case; 10. Liquid-cooled bottom plate; 101. Boss; 1011. Groove; 102. Liquid-cooled shunt channel; 103. Connecting port; 104. First side; 105. Second side; 11. Partition plate; 110. Partition channel; 12. Side beam; 120. Horizontal connection; 1201. Channel fork; 121. Vertical connection; 122. Main channel; 123. Water inlet joint; 124. Water outlet joint; 13. Front beam; 14. Rear beam; 15. Sealing block; 16. Sealing plate; 2. Upper cover; 3. Battery cell stack; 30. Battery cell; 301. Foam; 302. Curling structure. DETAILED DESCRIPTION

[0041] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0042] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as "width", "up", "down", "front", "back", "top" and "bottom" are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", and "set" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0045] Embodiment 1

[0046] Please refer to Figure 1-Figure 18 In a first aspect, the present invention provides a battery box 1 with integrated liquid cooling function. The battery box 1 disclosed in this embodiment can be used in, but is not limited to, a battery pack of a vehicle.

[0047] Reference Figure 1 , Figure 9-12The battery box 1 with integrated liquid cooling function disclosed in this embodiment includes a liquid cooling bottom plate 10, and the upper surface of the liquid cooling bottom plate 10 is provided with a plurality of bosses 101 extending in the horizontal direction, and any two adjacent bosses 101 are arranged at intervals, and the upper surface of the plurality of bosses 101 is used for placing the battery cell stack 3 after applying thermal conductive glue. The battery cell stack 3 includes a plurality of battery cells 30 stacked on each other and a buffer component provided between two adjacent battery cells 30, and the buffer component is foam 301 or aerogel. The stacking direction of the battery cells 30 of the battery cell stack 3 is the same as the arrangement direction of the bosses 101, and the buffer component between each adjacent battery cell 30 corresponds to the groove 1011 formed between each adjacent boss 101. It can be understood that when placing the battery cell stack 3, a layer of thermally conductive glue is first applied on the upper surface of each boss 101, and then the battery is placed on the thermally conductive glue. The battery cell stack 3 includes a plurality of battery cells 30 stacked on each other and a buffer component provided between two adjacent battery cells 30, and the buffer component between the adjacent battery cells 30 corresponds to the groove 1011 formed between each two adjacent bosses 101, so that the buffer component is located in the groove 1011, so that the entire upper surface of the liquid-cooled bottom plate 10 is avoided from being coated with a layer of thermally conductive glue, thereby reducing the use of thermally conductive glue. Since the buffer component is foam 301 or aerogel, the foam 301 or aerogel between the adjacent battery cells 30 corresponds to the groove 1011 formed between each two adjacent bosses 101, so that the foam 301 or aerogel is located in the groove 1011, thereby avoiding the entire upper surface of the liquid-cooled bottom plate 10 from being coated with a layer of thermally conductive glue, thereby reducing the use of thermally conductive glue.

[0048] In addition, the interior of the liquid cooling base plate 10 is also provided with a plurality of liquid cooling flow channels 102 which are interconnected and used to enter the liquid cooling medium (which may be cooling liquid), such as Figure 4 and Figure 5 As shown, the multiple liquid cooling shunt channels 102 correspond to the multiple bosses 101 one by one, so that the liquid cooling medium only cools the battery cells 30, without cooling the buffer components disposed between two adjacent battery cells 30, so that the liquid cooling medium is cooled in a targeted manner, thereby improving the cooling rate of the battery pack. In this way, the battery box 1 of the present invention saves the use of thermal conductive glue and improves the cooling rate of the battery cell stack 3.

[0049] It should be noted that the thermal conductive adhesive can be applied on the upper surface of the plurality of bosses 101 using a coating tool. In addition, the liquid cooling base plate 10 and the bosses 101 are formed by extrusion of metal aluminum, that is, the groove 1011 between two adjacent bosses 101 does not need to be machined out, but the liquid cooling base plate 10 and the bosses 101 are naturally formed by extrusion of metal aluminum. In addition, the thermal conductivity of the aluminum boss 101 is much higher than that of the thermal conductive adhesive, so the cooling efficiency of the battery can be further improved.

[0050] In one embodiment, referring to Figure 1Each boss 101 extends along the width direction of the liquid cooling bottom plate 10, and a plurality of bosses 101 are arranged at intervals along the length direction of the liquid cooling bottom plate 10. Correspondingly, the stacking direction of the battery cells 30 of the battery cell stack 3 is also stacked along the length direction of the liquid cooling bottom plate 10. Fig.15 shown.

[0051] In one embodiment, if Figure 1 As shown, there are multiple liquid-cooling base plates 10, and a partition plate 11 is sealed between two adjacent liquid-cooling base plates 10. A partition channel 110 is opened inside the partition plate 11, and the partition channel 110 connects the liquid-cooling shunt channel 102 between the two adjacent liquid-cooling base plates 10. Exemplarily, there are two liquid-cooling base plates 10, and a partition plate 11 is sealed between the two liquid-cooling base plates 10. A partition channel 110 is opened inside the partition plate 11, and the partition channel 110 runs through the opposite sides of the partition plate 11 in the width direction, and the partition channel 110 connects the liquid-cooling shunt channel 102 between the two liquid-cooling base plates 10. In this way, the liquid-cooling shunt channel 102 between the two liquid-cooling base plates 10 can be connected, so that the liquid-cooling medium can flow in each liquid-cooling base plate 10. As shown in FIG. Fig.15 As shown, since one liquid cooling base plate 10 corresponds to one battery cell stack 3, after the liquid cooling medium can flow in each liquid cooling base plate 10, the battery cells 30 of each battery cell stack 3 can be cooled. Of course, the number of liquid cooling base plates 10 is not limited to two, but can also be three. The three liquid cooling base plates 10 are spliced ​​in sequence along the extension direction of their bosses 101, which is not limited here, and the specific situation can be determined according to the number of battery cell 30 modules placed.

[0052] In one embodiment, if Figure 1 As shown, the spacer 11 is a spacer area of ​​the battery cell stack 3 placed on the two liquid-cooled bottom plates 10, and the spacer area can facilitate the connection of the tabs between the battery cells 30 of the two adjacent battery cell stacks 3. In addition, the surface where the boss 101 is connected to the liquid-cooled bottom plate 10 is flush with the upper surface of the spacer 11, so that the above-mentioned boss 101 does not need to be provided on the spacer 11, and thermal conductive adhesive does not need to be applied, which further reduces the use of thermal conductive adhesive.

[0053] In one embodiment, referring to Figure 2-Figure 4 The liquid cooling flow channel 102 passes through the first side and the second side of the liquid cooling bottom plate 10 which are opposite to each other. Figure 4 Here, the first side 104 and the second side 105 of the liquid-cooled bottom plate 10 are opposite to each other and are respectively the right side and the left side in the width direction of the liquid-cooled bottom plate 10. The side surfaces of the first sides 104 of the two adjacent liquid-cooled bottom plates 10 are sealed and connected by a spacer plate 11. The seal between the liquid-cooled bottom plate 10 and the spacer plate 11 can be sealed with a sealant, but it does not affect the connection between the spacer flow channel 110 and the liquid-cooled branch flow channel 102. Of course, other sealing methods can also be used, which are not limited here.

[0054] In one embodiment, referring to Figure 1 The battery box 1 also includes a side beam 12, which has two side beams. The side beams 12 are respectively sealed and connected to the side surfaces of the second sides of the first and last liquid cooling bottom plates 10 among the multiple liquid cooling bottom plates 10, and a main flow channel 122 communicating with the liquid cooling shunt channel 102 is opened in the side beam 12. Figure 1 As shown, two liquid-cooled bottom plates 10 are used as an example for explanation. The two side beams 12 are respectively sealed and connected to the side surfaces of the second sides of the two liquid-cooled bottom plates 10, and a main flow channel 122 communicating with the liquid-cooled shunt channel 102 is provided in the side beam 12, so that the liquid-cooling medium flows from the main flow channel 122 into each liquid-cooled shunt channel 102 to achieve cooling of the battery cells 30 of the battery cell stack 3. Of course, a flow channel fork 1201 is provided on the side surface where the side beam 12 is connected to the side surface of the second side of the liquid-cooled bottom plate 10, and the flow channel fork 1201 is connected to multiple liquid-cooled shunt channels 102. It can be seen from this that the liquid-cooling medium enters the flow channel fork 1201 from the main flow channel 122 and then enters the liquid-cooled shunt channel 102 in the liquid-cooled bottom plate 10, thereby cooling the battery cells 30 of the battery cell stack 3 above the liquid-cooled bottom plate 10.

[0055] In one embodiment, referring to Figure 6-Figure 8 The side of the side beam 12 connected to the side of the second side of the liquid cooling bottom plate 10 is provided with a plurality of flow channel forks 1201, and the plurality of flow channel forks 1201 are in one-to-one correspondence with the plurality of liquid cooling branch channels 102, thereby accelerating the liquid cooling medium to enter each liquid cooling branch channel 102, thereby improving the cooling effect. Furthermore, the size of the flow channel forks 1201 is the same as the opening size of the liquid cooling branch channel 102, thereby further improving the cooling effect.

[0056] Of course, in other embodiments, only one flow channel fork 1201 may be provided. Since the liquid cooling branch channels 102 in the liquid cooling base plate 10 are interconnected, as long as there is one flow channel fork 1201 connecting the liquid cooling branch channel 102 with the main flow channel 122, the liquid cooling medium can enter the liquid cooling branch channel 102; the size of the flow channel fork 1201 may also be smaller than the opening size of the liquid cooling branch channel 102, which is not limited here and can be reasonably changed according to actual cooling needs.

[0057] In one embodiment, referring to Figure 1-Figure 8One side beam 12 is provided with a water inlet which is connected to its own main flow channel 122, and the water inlet is connected to a water inlet joint 123; the other side beam 12 is provided with a water outlet which is connected to its own main flow channel 122, and the water outlet is connected to a water outlet joint 124. In this way, the flow path of the liquid cooling medium is: enter the main flow channel 122 inside the side beam 12 from the water inlet joint 123, and then enter into multiple liquid cooling branch channels 102 respectively through multiple flow channel forks 1201, and finally flow into the main flow channel 122 of the other side beam 12, and be discharged from the water outlet joint 124 on the other side beam 12, so as to realize the circulation of the liquid cooling medium in the battery case 1 and improve the cooling effect of the battery cells 30 of the battery cell stack 3.

[0058] It should be noted that, in other embodiments, two adjacent liquid-cooling base plates 10 may not be connected, and an independent water inlet and outlet may be provided on each liquid-cooling base plate 10 , so that the liquid-cooling medium can circulate in the liquid-cooling shunt channel 102 in the liquid-cooling base plate 10 to cool the battery cells 30 of the battery cell stack 3 .

[0059] In one embodiment, a cooling channel connected to the liquid-cooling shunt channel 102 is provided in the boss 101, that is, the interior of the boss 101 is a hollow structure, so that the liquid-cooling medium in the liquid-cooling shunt channel 102 can enter the cooling channel in each boss 101 to cool the battery cell 30 on the upper surface of the boss 101, thereby greatly improving the cooling effect of the battery cell 30.

[0060] It should be noted that the cooling channel is provided in the boss 101, which can reduce the use of aluminum profiles and reduce the weight of the liquid-cooled base plate 10. When the weight of the liquid-cooled base plate 10 is reduced, under the condition of a battery pack of the same weight, the energy sealing of the battery cell 30 can be appropriately increased, thereby improving the energy density of the battery pack.

[0061] In one embodiment, referring to Figure 1 or Figure 8 The side beam 12 is an L-shaped profile. The side beam 12 includes an integrally connected horizontal connection portion 120 and a vertical connection portion 121. The horizontal connection portion 120 is connected to the side of the second side of the liquid-cooled base plate 10. In order to facilitate the processing and forming of the main flow channel 122, the main flow channel 122 is arranged inside the horizontal connection portion 120 and passes through the opposite ends of the horizontal connection portion 120. Of course, the openings at the opposite ends of the horizontal connection portion 120 need to be blocked and sealed by the blocking blocks 15. In addition, the vertical connection portion 121 extends upward along the height direction of the liquid-cooled base plate 10, serving as a supporting structure for the side of the battery cell stack 3. It can be understood that the side beam 12 is formed in one piece by extrusion of metal aluminum. After the side beam 12 is formed, the main flow channel 122 passes through the opposite ends of the horizontal connection portion 120, so the blocking blocks 15 are required to block and seal.

[0062] In one embodiment, the battery box 1 further includes a front beam 13 and a rear beam 14, which are respectively fixed to opposite ends of the liquid cooling bottom plate 10. The opposite ends described in this embodiment refer to the two ends along the length direction of the liquid cooling bottom plate 10. The front beam 13, the rear beam 14 and the two vertical connecting parts 121 enclose a receiving cavity for placing the battery cell 30. It can be seen that the front beam 13, the rear beam 14 and the two vertical connecting parts 121 are surrounded by the liquid cooling bottom plate 10, and the front beam 13, the rear beam 14 and the two side beams 12 play the role of supporting the main structure of the liquid cooling box. All the bosses 101 on the liquid cooling bottom plate 10 are located in the receiving cavity enclosed by the front beam 13, the rear beam 14 and the two vertical connecting parts 121, and the liquid cooling box as a whole is welded by the liquid cooling bottom plate 10, the front beam 13, the rear beam 14 and the two side beams 12.

[0063] Reference Figure 9-Figure 15 The second aspect of the present invention provides a battery pack, comprising an upper cover 2, a battery cell stack 3 and a battery case 1 according to the first aspect of the present invention; wherein the upper cover 2 is connected to the battery case 1 and covers the battery cell stack 3. The upper cover 2 and the battery case 1 can be connected and fixed by screws. The battery pack provided in the second aspect of the present application includes the battery case 1 in the first aspect, and thus has the technical effects of any one of the above-mentioned first aspect, which will not be described in detail here.

[0064] In one embodiment, if Figure 12-Figure 15 As shown, the battery cell 30 of the battery cell stack 3 is a battery cell with a rolled edge structure or a battery cell with a sealed edge structure. The battery cell with a sealed edge structure generally refers to a soft-pack battery cell. The shell of the soft-pack battery cell is formed by coating an aluminum-plastic film, and the parts where the aluminum-plastic films are bonded to each other form a sealed edge structure. The sealed edge structure of the soft-pack battery cell usually has a three-sealed edge structure or a four-sealed edge structure. The battery cell with a rolled edge structure generally refers to a square shell battery cell. Fig.14 , the opposite sides on one end of the square shell battery cell usually form a curling structure 302, which is common knowledge in the field of batteries. A brief explanation here is helpful to understand the battery cell with a curling structure or a battery cell with an edge sealing structure. Among them, the groove 1011 is also used to accommodate the edge sealing structure or curling structure 302 on the battery cell 30 that protrudes outside the bottom of the battery cell 30. That is, it can be understood that when the battery cell stack 3 is placed on the boss 101, if the battery cell 30 on the battery cell stack 3 has an edge sealing or curling structure 302, the edge sealing or curling structure 302 on the battery cell 30 that protrudes outside the bottom of the battery cell 30 just falls into the groove 1011 between the two adjacent bosses 101, which is suitable for the battery cell 30 with a curling or edge sealing structure. It can be seen from this that the liquid cooling box of the present invention is suitable for both the traditional square shell battery cell 30 structure and the battery cell 30 with a curling edge sealing structure, and has strong applicability, which improves the versatility of the battery box 1.

[0065] Embodiment 2

[0066] The difference between this embodiment and the first embodiment lies in the difference in the structure of the battery box 1 .

[0067] In this embodiment, refer to Figure 16-18 The battery box 1 includes a liquid cooling bottom plate 10, and a plurality of bosses 101 extending in the horizontal direction are provided on the upper surface of the liquid cooling bottom plate 10, and any two adjacent bosses 101 are arranged at intervals, and the upper surface of the plurality of bosses 101 is used for applying thermal conductive adhesive and placing the battery cell stack 3. The battery cell stack 3 includes a plurality of battery cells 30 stacked on each other and a buffer component provided between two adjacent battery cells 30. The stacking direction of the battery cells 30 of the battery cell stack 3 is the same as the arrangement direction of the bosses 101, and the buffer component between each adjacent battery cell 30 corresponds to the groove 1011 formed between each adjacent boss 101. From this, it can be understood that when placing the battery cell stack 3, a layer of thermally conductive adhesive is first applied on the upper surface of each boss 101, and then the battery is placed on the thermally conductive adhesive. The battery cell stack 3 includes a plurality of battery cells 30 stacked on each other and a buffer component provided between two adjacent battery cells 30, and the buffer component between adjacent battery cells 30 corresponds to the groove 1011 formed between each adjacent boss 101, so that the buffer component is located in the groove 1011. In this way, it is possible to avoid coating a layer of thermally conductive adhesive on the entire upper surface of the liquid-cooled base plate 10, thereby reducing the use of thermally conductive adhesive.

[0068] In addition, the interior of the liquid cooling base plate 10 is also provided with a plurality of liquid cooling flow channels 102 which are interconnected and used to enter the liquid cooling medium (which may be cooling liquid), such as Figure 16-18 As shown, the multiple liquid cooling shunt channels 102 correspond to the multiple bosses 101 one by one, so that the liquid cooling medium only cools the battery cells 30, without cooling the buffer components disposed between two adjacent battery cells 30, so that the liquid cooling medium is cooled in a targeted manner, thereby improving the cooling rate of the battery pack. In this way, the battery box 1 of this embodiment saves the use of thermal conductive glue and improves the cooling rate of the battery cell stack 3.

[0069] It should be noted that the thermal conductive adhesive can be applied on the upper surface of the plurality of bosses 101 using a coating tool. In addition, the liquid cooling base plate 10 and the bosses 101 are formed by extrusion of metal aluminum, that is, the groove 1011 between two adjacent bosses 101 does not need to be machined out, but the liquid cooling base plate 10 and the bosses 101 are naturally formed by extrusion of metal aluminum. In addition, the thermal conductivity of the aluminum boss 101 is much higher than that of the thermal conductive adhesive, so the cooling efficiency of the battery can be further improved.

[0070] In one embodiment, the boss 101 extends along the length direction of the liquid-cooled bottom plate 10, and a plurality of bosses 101 are arranged at intervals along the width direction of the liquid-cooled bottom plate 10; correspondingly, the stacking direction of the battery cells 30 of the battery cell stack 3 is also stacked along the width direction of the liquid-cooled bottom plate 10. Fig.19 shown.

[0071] In one embodiment, if Figure 16-18 As shown, one side of the liquid cooling bottom plate 10 is integrally connected with a side beam 12 extending upward along the height of the liquid cooling bottom plate 10, and the connection between the liquid cooling bottom plate 10 and the side beam 12 forms an L-shaped liquid cooling profile, and the L-shaped liquid cooling profile is formed by extrusion of metal aluminum. There are two liquid cooling profiles, one side of the liquid cooling profile away from its own side beam 12 is connected to the side of the other liquid cooling profile away from its own side beam 12; the interior of one liquid cooling profile is also provided with a main flow channel 122 communicating with its own liquid cooling shunt channel 102, and the liquid cooling profile is also provided with a water inlet communicating with its main flow channel 122, the water inlet is connected to a water inlet joint 123, and the water inlet joint 123 is externally connected to an external coolant, and the interior of the other liquid cooling profile is also provided with a main flow channel 122 communicating with its own liquid cooling shunt channel 102, and the other liquid cooling profile is also provided with a water outlet communicating with its main flow channel 122, and the water outlet is connected to a water outlet joint 124. Of course, the liquid-cooling shunt channel 102 of one liquid-cooling profile is connected to the liquid-cooling shunt channel 102 of another liquid-cooling profile. The specific connecting structure is: a connecting port 103 is opened on the joint surface of the two liquid-cooling profiles. It can be seen that the flow path of the liquid-cooling medium in this embodiment is: from a water inlet into the main flow channel 122 of a liquid-cooling profile, then into the liquid-cooling shunt channel 102 of the liquid-cooling profile, and then into the liquid-cooling shunt channel 102 in another liquid-cooling profile through the connecting port 103, and finally into the main flow channel 122 of the other liquid-cooling profile, and then discharged from the water outlet joint 124 of the other liquid-cooling profile, to realize the internal circulation flow channel of the liquid-cooling medium liquid-cooling profile, thereby cooling the battery cells 30 of the battery cell stack 3.

[0072] Of course, in other embodiments, the liquid cooling shunt channels 102 in the two liquid cooling profiles may not be connected, and an independent water inlet and outlet may be provided on each liquid cooling profile, so that the liquid cooling medium can circulate in the liquid cooling shunt channels 102 in the liquid cooling profile to cool the battery cells 30 of the battery cell stack 3.

[0073] In one embodiment, since the liquid-cooling profile is formed in one piece by extrusion of metal aluminum, the liquid-cooling diversion channel 102 of the formed liquid-cooling profile passes through the opposite ends of the liquid-cooling base plate 10. Therefore, the openings at the opposite ends of the liquid-cooling base plate 10 need to be sealed by the sealing plates 16.

[0074] In one embodiment, referring to Fig.16The battery box 1 also includes a front beam 13 and a rear beam 14, which are respectively fixed to the opposite ends of the liquid-cooling bottom plate 10. The opposite ends described in this embodiment refer to the two ends along the length direction of the liquid-cooling bottom plate 10. The front beam 13, the rear beam 14 and the two vertical connecting parts 121 enclose a receiving cavity for placing the battery cell 30. It can be seen that the front beam 13, the rear beam 14 and the two side beams 12 are surrounded by the liquid-cooling bottom plate 10. The front beam 13, the rear beam 14 and the two side beams 12 play the role of supporting the main structure of the liquid-cooling box. All the bosses 101 on the liquid-cooling bottom plate 10 are located in the receiving cavity enclosed by the front beam 13, the rear beam 14 and the two side beams 12, and the liquid-cooling box as a whole is welded by the liquid-cooling bottom plate 10, the front beam 13, the rear beam 14 and the two side beams 12.

[0075] It should be noted that, due to the different arrangement of the bosses 101 on the liquid cooling base plate 10, the stacking direction of the battery cells 30 is different from that of the battery cells 30 in the first embodiment. Fig.19 shown.

[0076] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A battery box with integrated liquid cooling function, characterized in that: It comprises a liquid-cooling base plate, wherein the upper surface of the liquid-cooling base plate is provided with a plurality of bosses extending in the horizontal direction, any two adjacent bosses are arranged at intervals, the upper surfaces of the plurality of bosses are coated with a heat-conducting adhesive, and a plurality of battery cells are placed on the heat-conducting adhesive; a groove is formed between two adjacent bosses, and the groove corresponds to the foam or aerogel between two adjacent battery cells; the interior of the liquid-cooling base plate is also provided with a plurality of liquid-cooling shunt channels which are interconnected and used for entering a liquid-cooling medium, and the plurality of liquid-cooling shunt channels correspond to the plurality of bosses one by one; the liquid-cooling shunt channels penetrate the first side and the second side of the liquid-cooling base plate which are arranged opposite to each other, and a cooling channel which is communicated with the liquid-cooling shunt channels is provided in the boss, that is, the interior of the boss is a hollow structure; the liquid-cooling base plate and the boss are integrally formed by extrusion of metal aluminum; There are multiple liquid-cooled base plates, and a partition plate is sealed between two adjacent liquid-cooled base plates. A partition flow channel is opened inside the partition plate, and the partition flow channel connects the liquid-cooled shunt channel between the two adjacent liquid-cooled base plates; the partition plate is a spacing area for the battery cell stack placed on the two adjacent liquid-cooled base plates; the surface of the boss connected to the liquid-cooled base plate is flush with the upper surface of the partition plate.

2. The battery box with integrated liquid cooling function according to claim 1, characterized in that: Each of the bosses extends along the width direction of the liquid cooling base plate, and multiple bosses are arranged at intervals along the length direction of the liquid cooling base plate; or each of the bosses extends along the length direction of the liquid cooling base plate, and multiple bosses are arranged at intervals along the width direction of the liquid cooling base plate.

3. The battery box with integrated liquid cooling function according to claim 2, characterized in that: The side surfaces of the first sides of two adjacent liquid-cooling bottom plates are sealed and connected via the spacer plate.

4. The battery box with integrated liquid cooling function according to claim 3, characterized in that: It also includes two side beams, which are respectively sealed and connected to the side surfaces of the second sides of the first and last liquid cooling bottom plates among the multiple liquid cooling bottom plates, and a main flow channel communicating with the liquid cooling branch channel is opened in the side beam.

5. The battery box with integrated liquid cooling function according to claim 4, characterized in that: A flow channel fork is provided on the side where the side beam is connected to the second side of the liquid cooling bottom plate, and the flow channel fork is connected to multiple liquid cooling branch channels; there are multiple flow channel forks, and the multiple flow channel forks are connected to multiple liquid cooling branch channels in a one-to-one correspondence.

6. The battery box with integrated liquid cooling function according to claim 5, characterized in that: A water inlet communicating with the main flow channel is arranged on one of the side beams, and the water inlet is connected with a water inlet joint; a water outlet communicating with the main flow channel is arranged on the other side beam, and the water outlet is connected with a water outlet joint.

7. The battery box with integrated liquid cooling function according to claim 4, characterized in that: It also includes a front beam and a rear beam, which are respectively fixed to the opposite ends of the liquid cooling bottom plate, and the front beam and the rear beam are surrounded by the two side beams to form a receiving cavity for placing the battery cell stack.

8. The battery box with integrated liquid cooling function according to claim 1, characterized in that: One side of the liquid cooling bottom plate is integrally connected with a side beam extending upward along the height of the liquid cooling bottom plate, and the connection between the liquid cooling bottom plate and the side beam forms an L-shaped liquid cooling profile, and the L-shaped liquid cooling profile is integrally formed by extrusion of metal aluminum.

9. The battery box with integrated liquid cooling function according to claim 8, characterized in that: There are two liquid-cooling profiles, one side of the liquid-cooling profile facing away from the body beam is connected to the other side of the liquid-cooling profile facing away from the body beam; the interior of the liquid-cooling profile is also provided with a main flow channel connected to its liquid-cooling branch channel, and the liquid-cooling profile is also provided with a water inlet connected to the main flow channel.

10. The battery box with integrated liquid cooling function according to claim 9, characterized in that: The liquid-cooling shunt channel runs through the first side and the second side of the liquid-cooling bottom plate, and the openings of the first side and the second side of the liquid-cooling bottom plate are sealed by a sealing plate.

11. A battery pack, characterized in that: It comprises an upper cover, a battery cell stack and a battery case as described in any one of claims 1 to 10, wherein the upper cover is connected to the battery case and covers the battery cell stack, the battery cell stack comprises a plurality of battery cells stacked on each other and foam or aerogel arranged between two adjacent battery cells, and the stacking direction of the battery cells is the same as the arrangement direction of the bosses.

12. A battery pack according to claim 11, characterized in that: The battery cells of the battery cell stack are battery cells with a curling structure or a sealing edge structure, and the grooves are used to avoid the sealing edge or curling structure protruding from the battery cells.

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