Battery pack

Abstract

The battery pack comprises a battery cell module and a liquid cooling assembly, the battery cell module comprises a plurality of stacked single battery cells, each single battery cell comprises a first side surface opposite to the adjacent single battery cells and a second side surface adjacent to the first side surface, and the second side surface is provided with a first inclined surface and a second inclined surface; the liquid cooling assembly comprises a plurality of liquid cooling plates, a water inlet pipeline and a water outlet pipeline, liquid inlets of the plurality of liquid cooling plates are connected to the water inlet pipeline, liquid outlets of the plurality of liquid cooling plates are connected to the water outlet pipeline, the liquid cooling plates are attached between the first side surfaces of the adjacent single battery cells, and the water inlet pipeline and the water outlet pipeline are arranged on the first inclined surface and the second inclined surface respectively. The water inlet pipeline and the water outlet pipeline in the battery pack can be respectively arranged on the first inclined surface and the second inclined surface of the single battery cell, so that the space of the oblique angle part of the single battery cell is utilized to the maximum extent, and the space utilization rate of the battery pack is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack. Background Art

[0002] Lithium-ion batteries, due to their high energy density, have gradually become the dominant battery for new energy vehicles. As demands for the range and charging efficiency of new energy vehicles continue to increase, lithium-ion batteries need to have even higher energy density to meet these requirements.

[0003] For new energy vehicles, how to improve the energy density of battery modules is an urgent issue to be solved under limited vehicle space and weight restrictions. Summary of the Invention

[0004] In view of this, embodiments of the present application provide a battery pack to solve at least one problem existing in the background technology.

[0005] In a first aspect, an embodiment of the present application provides a battery pack, comprising: A battery cell module includes a plurality of stacked single battery cells, each of which includes a first side surface opposite to an adjacent single battery cell and a second side surface adjacent to the first side surface, wherein the second side surface is provided with a first inclined surface and a second inclined surface; The liquid cooling assembly includes multiple liquid cooling plates, a water inlet pipe and a water outlet pipe. The liquid inlets of the multiple liquid cooling plates are connected to the water inlet pipe, and the liquid outlets of the multiple liquid cooling plates are connected to the water outlet pipe. The liquid cooling plates are attached between the first side surfaces of adjacent single battery cells, and the water inlet pipe and the water outlet pipe are respectively arranged on the first inclined surface and the second inclined surface.

[0006] In combination with the first aspect of the present application, in an optional embodiment, the second side surface includes a plurality of second sub-side surfaces connected in sequence, the first inclined surface and the second inclined surface are respectively arranged between two adjacent second sub-side surfaces, and are arranged diagonally, and the first inclined surface and the second inclined surface are arranged parallel to each other.

[0007] In conjunction with the first aspect of the present application, in an optional embodiment, the liquid cooling plate extends and bends at a position corresponding to the first inclined surface to form a liquid inlet end, the liquid inlet is located at the liquid inlet end, and the liquid inlet end is in contact with the first inclined surface; The liquid cooling plate extends and bends at a position corresponding to the second inclined surface to form a liquid outlet end. The liquid outlet is located at the liquid outlet end, and the liquid outlet end is in contact with the second inclined surface.

[0008] In conjunction with the first aspect of the present application, in an optional embodiment, the explosion-proof valve of the single battery cell is provided on the first inclined surface, and the liquid inlet end covers the explosion-proof valve; The explosion-proof valve and the liquid inlet are staggered.

[0009] In combination with the first aspect of the present application, in an optional embodiment, the liquid cooling plate has a liquid cooling flow channel inside, and the liquid cooling flow channel includes a first flow channel and a second flow channel connected to each other, the first flow channel extends along the direction of the water inlet pipe, and is relatively arranged along the height direction of the single battery cell, and the second flow channel is bent to connect two adjacent first flow channels, the liquid inlet is connected to the first flow channel with the highest height, and the liquid outlet is connected to the first flow channel with the lowest height, so that the coolant can flow from the liquid inlet into the first flow channel with the highest height, and then flow out from the first flow channel with the lowest height to the liquid outlet after detour.

[0010] In combination with the first aspect of the present application, in an optional embodiment, the positive electrode column and the negative electrode column of the single battery cell are respectively arranged on two second sub-side surfaces adjacent to the first inclined surface, and are arranged close to the first inclined surface.

[0011] In conjunction with the first aspect of the present application, in an optional embodiment, the battery pack further includes: A CCS bracket, connected to the single cell, includes a first support seat corresponding to the first inclined surface and a second support seat connected to both ends of the first support seat, wherein the second support seats respectively correspond to the two second sub-side surfaces adjacent to the first inclined surface; The first support base is provided with a plurality of first through holes, the liquid inlet end is provided between the first support base and the first inclined surface, the liquid inlet is exposed from the first through hole, and the water inlet pipe is provided on a side of the first support base away from the first inclined surface to communicate with the liquid inlet; The second support base is provided with a plurality of second through holes, and the battery pack further includes a tab, and the second through holes respectively expose the positive electrode column and the negative electrode column to be connected to the tab.

[0012] In combination with the first aspect of the present application, in an optional embodiment, a first tooth structure is provided on a side of the positive electrode post and the negative electrode post away from the single battery cell; The bar is provided with a second tooth structure adapted to the first tooth structure.

[0013] In combination with the first aspect of the present application, in an optional embodiment, the battery pack further includes a collection component, the collection component including a collection body and a plurality of collection branches, the collection body is arranged on the first support seat, and the collection branches are arranged between the first tooth structure and the second tooth structure.

[0014] In combination with the first aspect of the present application, in an optional embodiment, the tab is provided with a first clip; the single cell further includes a second clip, the second clip is connected to the single cell and is located around the positive electrode and the negative electrode, the first clip is engaged with the second clip so that the tab can be detachably connected to the single cell.

[0015] The single cell in the battery pack provided in the embodiment of the present application includes a first side surface opposite to the adjacent single cell, and a second side surface adjacent to the first side surface, the second side surface is provided with a first inclined surface and a second inclined surface, the liquid cooling plate is attached between the first side surfaces of the adjacent single cells, the water inlet pipe and the water outlet pipe are respectively arranged on the first inclined surface and the second inclined surface, the water inlet pipe and the water outlet pipe can be respectively arranged on the first inclined surface and the second inclined surface of the single cell, so that the space of the oblique angle part of the single cell is maximized, thereby improving the space utilization rate of the battery pack and thereby improving the energy density of the battery module; in addition, the liquid cooling plate is attached between the first side surfaces of the adjacent single cells, so that the single liquid cooling plate contacts the single cell with the largest area for heat dissipation, thereby achieving fast cooling and heating, which is consistent with high-rate charging and discharging, improves the heat dissipation rate of the battery, and can achieve fast charging.

[0016] The liquid inlet and the liquid outlet are respectively fitted to the first inclined surface and the second inclined surface, which enables the liquid cooling plate to better fit the single battery cell, improves the heat dissipation efficiency, and improves the space utilization of the single battery cell.

[0017] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings: Figure 1 A side view of a battery pack provided in an embodiment of the present application; Figure 2 A schematic diagram of a partial structural decomposition of a battery pack provided in an embodiment of the present application; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 Schematic diagram of the three-dimensional structure of the liquid cooling assembly in the battery pack in the embodiment of the present application; Figure 5 A schematic diagram of a portion of the structure of a battery pack provided in an embodiment of the present application; Figure 6 A schematic diagram of the CCS assembly structure in the battery pack provided in an embodiment of the present application; Figure 7 for Figure 6 Enlarged view of point B in the middle; Figure 8 A schematic cross-sectional view of a battery pack provided in an embodiment of the present application; Figure 9 for Figure 8 Enlarged view of point C in the middle; Figure 10 A schematic diagram of the three-dimensional structure of a battery pack provided in an embodiment of the present application; Figure 11 for Figure 10 Enlarged view of point D in the middle.

[0019] Reference numerals: 100. Battery pack; 10. Battery module; 11. Single battery cell; 111. First side surface; 112. Second side surface; 1121. First inclined surface; 1122. Second inclined surface; 1123. Second sub-side surface; 113. Explosion-proof valve; 114. Positive electrode; 115. Negative electrode; 118. First tooth structure; 119. Second clamping member; 1191. Connecting arm; 1192. Clamping hole; 20. Liquid cooling assembly; 21. Liquid cooling plate; 22. Water inlet pipe; 23. Water outlet pipe; 24. Liquid inlet; 241. Liquid inlet; 25. Liquid outlet; 251. Liquid outlet; 26. Liquid cooling channel; 261. First channel; 262. Second channel; 30. CCS bracket; 31. first support base; 311. first through hole; 312. groove; 32. second support base; 321. second through hole; 40. Bar; 41. Second tooth structure; 42. First clamping member; 421. Clamping protrusion; 50. Collection component; 51. Collection subject; 52. Collection branch. DETAILED DESCRIPTION

[0020] To make the technical solutions and beneficial effects of the present invention more clearly understood, the following detailed description is given by way of specific embodiments. The accompanying drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly illustrate the details of the local features. Unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which this application belongs.

[0021] In the description of the present invention, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of simplifying the description of the present invention, and do not indicate that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and should not be understood as a limitation to the present invention.

[0022] In this disclosure, the terms "first" and "second" are used solely for descriptive purposes and should not be construed as indicating the relative importance of the features indicated or the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly include at least one such feature. In the description of this disclosure, "plurality" means at least two, such as two or three, and "several" means at least one, such as one, two, or three, unless otherwise specifically defined.

[0023] In the present invention, unless otherwise expressly defined, the terms "installed," "connected," "connect," "fixed," and "disposed" should be understood broadly. For example, "connection" can mean fixed, removable, or integrated; it can mean mechanical or electrical; it can mean direct or indirect connection through an intermediary; it can also mean internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0024] In the present invention, unless otherwise clearly defined, when a first feature is “on,” “above,” “above,” “above,” “below,” “below,” or “below” a second feature, the first feature and the second feature may be in direct contact, or the first feature and the second feature may be in indirect contact via an intermediate medium. Moreover, when a first feature is “on,” “above,” or “above” a second feature, it may mean that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than the horizontal height of the second feature. When a first feature is “below,” “below,” or “below” a second feature, it may mean that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0025] This embodiment of the present application provides a battery pack 100, please refer to Figures 1 to 4The battery pack 100 includes a cell module 10 and a liquid cooling assembly 20. The cell module 10 includes a plurality of stacked single cells 11. The single cell 11 includes a first side surface 111 opposite to the adjacent single cell 11, and a second side surface 112 adjacent to the first side surface 111. The second side surface 112 is provided with a first inclined surface 1121 and a second inclined surface 1122. Specifically, the first side surfaces 111 are arranged opposite to each other along the stacking direction of the single cells 11, and the second side surfaces 112 are connected to the two first side surfaces 111 on both sides along the stacking direction, so as to enclose the first side surfaces 111 to form a storage space for accommodating the electrode assembly of the single cell 11. The electrode assembly generally includes a positive electrode sheet, a negative electrode sheet, and a separator separating the positive electrode sheet and the negative electrode sheet. An electrolyte can be injected into the single cell 11, and the electrolyte can penetrate into the interior of the electrode assembly, providing an ion migration path for the electrochemical reaction of the electrode assembly and playing a conductive role. The electrode assembly can be in the form of a winding type, a laminated type, etc. One or more electrode assemblies can be mounted within a single cell. The liquid cooling assembly 20 includes multiple liquid cooling plates 21, a water inlet pipe 22, and a water outlet pipe 23. The liquid inlets 241 of the multiple liquid cooling plates 21 are all connected to the water inlet pipe 22, and the liquid outlets 251 of the multiple liquid cooling plates 21 are all connected to the water outlet pipe 23. The liquid cooling plates 21 are attached between the first side surfaces 111 of adjacent single cells 11, and the water inlet pipe 22 and the water outlet pipe 23 are respectively disposed on the first inclined surface 1121 and the second inclined surface 1122.

[0026] The first side surface 111 is the large surface of the single cell 11 . The liquid cooling plate 21 is located between the first side surfaces 111 of adjacent single cells 11 , which can increase the contact area between the liquid cooling plate 21 and the single cell 11 , thereby improving the heat dissipation efficiency of the liquid cooling assembly 20 on the single cell 11 .

[0027] In the embodiment of the present application, the water inlet pipe 22 and the water outlet pipe 23 can be respectively arranged on the first inclined surface 1121 and the second inclined surface 1122 of the single battery cell 11, so that the space of the oblique angle portion of the single battery cell 11 is maximized, thereby improving the space utilization rate of the battery pack 100. At the same time, the first inclined surface 1121 and the second inclined surface 1122 are respectively used to limit the water inlet pipe 22 and the water outlet pipe 23, thereby improving the stability of the liquid cooling plate 21 and facilitating the installation of water inlet and outlet. In addition, the liquid cooling plate 21 is fitted between the first side surfaces 111 of adjacent single battery cells 11, so that the single cold plate contacts the battery cell with the largest area for heat dissipation, thereby achieving fast cooling and heating, which is consistent with high-rate charging and discharging, improves the heat dissipation rate of the battery, and can achieve fast charging.

[0028] In an optional embodiment, the second side surface 112 includes a plurality of second sub-side surfaces 1123 connected in series, with adjacent second sub-side surfaces 1123 disposed at right angles to each other, and the first inclined surface 1121 and the second inclined surface 1122 are disposed diagonally between two adjacent second sub-side surfaces 1123, and the first inclined surface 1121 and the second inclined surface 1122 are disposed parallel to each other. That is, the first inclined surface 1121 and the second inclined surface 1122 are disposed at an angle to the two adjacent second sub-side surfaces 1123, and the angle may be an obtuse angle. Specifically, the angles between the first bevel 1121, the second bevel 1122 and the two adjacent second sub-side surfaces 1123 can be the same, in which case the angle can be 135°, or the angles between the first bevel 1121, the second bevel 1122 and the two adjacent second sub-side surfaces 1123 can be different, for example, one is 150° and the other is 120°. They can be set as needed, as long as both are obtuse angles and the sum of the two angles is 270°, so as to avoid reducing the overall strength and at the same time avoid reducing space utilization.

[0029] In the embodiment of the present application, the first inclined surface 1121 and the second inclined surface 1122 are arranged diagonally, and the water inlet pipe 22 and the water outlet pipe 23 are respectively attached to the first inclined surface 1121 and the second inclined surface 1122 of the single battery cell 11, so that the space of the oblique angle portion of the single battery cell 11 is maximized, and at the same time, the liquid cooling plate 21 is limited on two opposite sides to improve the stability of the liquid cooling plate 21; in addition, the first inclined surface 1121 and the second inclined surface 1122 are parallel to each other, which is conducive to the circulation of coolant and uniform heat dissipation; in addition, the first inclined surface 1121 and the second inclined surface 1122 are arranged diagonally, and the water inlet pipe 22 and the water outlet pipe 23 are respectively provided, which can also increase the overall flow length of the liquid cooling channel 26, thereby increasing the contact area between the liquid cooling channel 26 and the single battery cell 11, thereby improving the heat dissipation effect and heat dissipation efficiency of the single battery cell 11.

[0030] In an optional embodiment, the liquid cooling plate 21 extends and bends at a position corresponding to the first inclined surface 1121 to form a liquid inlet end 24, the liquid inlet port 241 is located at the liquid inlet end 24, and the liquid inlet end 24 is attached to the first inclined surface 1121; the liquid cooling plate 21 extends and bends at a position corresponding to the second inclined surface 1122 to form a liquid outlet end 25, the liquid outlet port 251 is located at the liquid outlet end 25, and the liquid outlet end 25 is attached to the second inclined surface 1122. The liquid inlet end 24, the liquid outlet end 25 and the body of the liquid cooling plate 21 are covered on the three sides of the single battery cell 11. This structural design enables the liquid cooling plate 21 to better fit with the single battery cell 11, not only fitting with the first side 111 of the single battery cell 11, but also fitting with the second side 112, thereby improving the heat dissipation efficiency. At the same time, the relatively arranged liquid inlet end 24, the liquid outlet end 25 and the first inclined surface 1121 and the second inclined surface 1122 cooperate to improve the stability of the liquid cooling plate during operation. In addition, the liquid inlet end 24 and the liquid outlet end 25 are respectively attached to the first inclined surface 1121 and the second inclined surface 1122, and the water inlet pipe 22 and the water outlet pipe 23 are also respectively attached to the first inclined surface 1121 and the second inclined surface 1122, which can maximize the use of the space of the oblique angle part of the single battery cell 11, further improve the space utilization rate of the single battery cell 11, and improve the energy density of the single battery cell 11.

[0031] In an alternative embodiment, please refer to Figures 3 to 5 The liquid cooling plate 21 has a liquid cooling channel 26 inside. The liquid cooling channel 26 includes a first channel 261 and a second channel 262 connected to each other. The first channel 261 is along the direction of the water inlet pipe 22 (ie, Figure 5 The direction of the arrow s1 shown in FIG) extends along the height direction of the single cell 11 (ie, Figure 5 The second flow channel 262 is arranged relative to each other (in the direction of the arrow s2 shown in the figure), and the second flow channel 262 is bent to connect the two adjacent first flow channels 261. The liquid inlet 241 is connected to the first flow channel 261 with the highest height, and the liquid outlet 251 is connected to the first flow channel 261 with the lowest height, so that the coolant can flow from the liquid inlet 241 into the first flow channel 261 with the highest height, and then flow out from the first flow channel 261 with the lowest height to the liquid outlet 251 after making a circuitous movement.

[0032] In the embodiment of the present application, the water inlet pipe 22 is located above the water outlet pipe 23, so that the coolant entering from the water inlet pipe 22 can flow to the water outlet pipe 23 under the action of gravity, which can reduce the local resistance of the coolant during the flow process, and can increase the flow speed and flow smoothness of the coolant in the liquid cooling channel 26, further improving the heat dissipation effect of the single battery cell 11. Preferably, refer to Figure 4 and Figure 5As shown, the second flow channel 262 is bent in the horizontal direction to further reduce the flow resistance, avoid energy loss and bubble accumulation, and improve the uniformity of temperature distribution.

[0033] Figure 5 The arrows shown in the figure represent the flow direction of the coolant, that is, the coolant enters the first flow channel 261 from the water inlet pipe 22 through the liquid inlet port 241 on the liquid inlet end 24 of the multiple single battery cells 11, and then enters the second flow channel 262 from the first flow channel 261. After winding in the second flow channel 262 of the curved structure, it enters the water outlet pipe 23 from the first flow channel 261 at the second inclined surface 1122. The curved structure of the second flow channel 262 can increase the contact area with the first side surface 111 of the single battery cell 11, thereby improving the heat dissipation efficiency; the two first flow channels 261 are respectively attached to the first inclined surface 1121 and the second inclined surface 1122, and the liquid inlet end and the liquid outlet end can be set through these two spaces, thereby reducing the overall occupied space of the battery pack 100, improving space utilization, and thus improving the energy density of the battery module.

[0034] The structural design of the first flow channel 261 and the second flow channel 262 in the embodiment of the present application can not only increase the overall flow length of the liquid cooling channel 26, but also reduce the flow resistance, and enable the coolant to circulate fully in the liquid cooling plate 21, thereby improving temperature uniformity and thus improving heat dissipation efficiency.

[0035] In an alternative embodiment, please refer to Figure 2 and Figure 3 , the positive pole 114 and the negative pole 115 of the single cell 11 are respectively arranged on the two second sub-side surfaces 1123 adjacent to the first bevel 1121, and are arranged close to the first bevel 1121. This design makes the electrode lead-out more centralized, reduces the distance between the positive pole 114 and the negative pole 115, and thus reduces the overall volume of the CCS assembly, which not only reduces the material cost of the CCS assembly, but also facilitates subsequent connection and management. The height of the first bevel 1121 is greater than the second bevel 1122, that is, the first bevel 1121 is a bevel at a higher position in the height direction of the single cell 11. The positive pole 114 and the negative pole 115 are arranged near the first bevel 1121, which also facilitates the installation of the CCS assembly and improves installation convenience.

[0036] In an alternative embodiment, please refer to Figures 6 to 11The battery pack 100 also includes a CCS assembly, which includes a CCS bracket 30. The CCS bracket 30 is connected to the single battery cell 11. The CCS bracket 30 includes a first support seat 31 corresponding to the first inclined surface 1121 and a second support seat 32 connected to both ends of the first support seat 31. The second support seats 32 respectively correspond to the two second sub-side surfaces 1123 adjacent to the first inclined surface 1121; the first support seat 31 is provided with a plurality of first through holes 311, the liquid inlet end 24 is arranged between the first support seat 31 and the first inclined surface 1121, the liquid inlet 241 is exposed from the first through hole 311, and the water inlet pipe 22 is arranged on the side of the first support seat 31 away from the first inclined surface 1121 to communicate with the liquid inlet 241; the second support seat 32 is provided with a plurality of second through holes 321. The battery pack 100 also includes a bar sheet 40, and the second through holes 321 respectively expose the positive electrode column 114 and the negative electrode column 115 to be connected to the bar sheet 40.

[0037] The design of the CCS bracket 30 in the embodiment of the present application not only provides support for the water inlet pipe 22 and the water outlet pipe 23, but also facilitates the connection of electrodes; in addition, the first support seat 31 corresponds to the first inclined surface 1121, and the two second support seats 32 correspond to the two second sub-side surfaces 1123 respectively. The CCS bracket 30 can be adapted to the positive electrode column 114 and the negative electrode column 115, thereby reducing the overall occupied space of the battery pack 100 while ensuring the connection stability of the battery pack 100.

[0038] The first support seat 31 and the second support seat 32 can be integrally formed, corresponding to the first inclined surface 1121 and the two second sub-side surfaces 1123 of the single cell 11, respectively, to form a three-sided contact structure. This not only improves the installation convenience of the CCS bracket 30, but also improves the installation reliability. At the same time, the liquid inlet end 24 is arranged between the first support seat 31 and the first inclined surface 1121, which can further improve the reliability of the liquid inlet end 24 and prevent displacement or warping of the liquid inlet end 24. In addition, the water inlet pipe 22 is arranged on the side of the first support seat 31 away from the first inclined surface 1121 and is directly connected to the liquid inlet port 241 of the liquid inlet end 24, which can shorten the length of the water pipe, reduce the risk of leakage, and improve installation convenience.

[0039] In an alternative embodiment, please refer to Figure 6 and Figure 7The CCS bracket 30 is also provided with a plurality of grooves 312, which are arranged at intervals along the stacking direction of the single battery cells 11. The grooves 312 are connected to the second through holes 321 provided on the second support seat 32, and the second through holes 321 correspond to the poles of the single battery cells. The grooves 312 are adapted to the tabs 40, and the depth of the grooves 312 is less than or equal to the thickness of the tabs 40, and the length and width of the grooves 312 are adapted to the length and width of the tabs 40. The tabs 40 are placed in the grooves 312, which can improve the overall appearance consistency of the CCS assembly, reduce the overall occupied space of the CCS assembly, and limit the tabs 40.

[0040] In an alternative embodiment, please refer to Figures 6 to 9 A first tooth structure 118 is provided on the side of the positive electrode post 114 and the negative electrode post 115 away from the single cell 11. The tab 40 is provided with a second tooth structure 41 adapted to the first tooth structure 118.

[0041] The first tooth structure 118 extends from the second through hole 321, and the first tooth structure 118 and the second tooth structure 41 are plugged in together to realize the electrical connection between the bar 40 and the pole, which can increase the contact area between the pole and the bar 40 and improve the connection reliability. At the same time, the limiting effect of the groove 312 on the bar 40 can improve the convenience of installation and avoid the problem of misalignment during insertion.

[0042] In an alternative embodiment, please refer to Figure 2 、 Figure 8 and Figure 9 The explosion-proof valve 113 of the single cell 11 is disposed on the first inclined surface 1121, and the liquid inlet end 24 covers the explosion-proof valve 113. The explosion-proof valve 113 and the liquid inlet 241 are staggered. That is, the explosion-proof valve 113 and the liquid inlet 241 of the liquid inlet end 24 do not directly correspond to each other. This design not only ensures the normal operation of the explosion-proof valve 113, but also greatly reduces the risk of the explosion-proof valve 113 directly breaking through the connection with the liquid inlet 241, providing a certain buffering effect and thus improving safety.

[0043] In an alternative embodiment, please refer to Figure 7 、 Figure 9 and Figure 11 The tab 40 is provided with a first clip 42, and the single cell 11 also includes a second clip 119. The second clip 119 is connected to the single cell 11 and is located around the positive electrode 114 and the negative electrode 115. The first clip 42 is clipped with the second clip 119 so that the tab 40 can be detachably connected to the single cell 11.

[0044] In the embodiment of the present application, the single cell 11 and the tab 40 are detachably connected via the first clip 42 and the second clip 119, which facilitates quick disassembly and assembly, and improves the convenience of maintenance and replacement of the battery pack 100. The second clip 119 is fixed to the positive electrode 114 and the negative electrode 115 of the single cell 11. The two second clips 119 can be arranged on opposite sides of the poles to improve the reliability of the connection. Specifically, the second clip 119 can be connected to the pole by nano-injection molding or by gluing, and can be connected and fixed as needed.

[0045] The second clamping member 119 is a connecting arm 1191 provided with a plurality of clamping holes 1192. The structural reliability of the clamping hole 1192 can be improved by the connecting arm 1191. The first clamping member 42 is a clamping protrusion 421 that can be inserted into the clamping hole 1192. When the clamping protrusion 421 is inserted into the clamping hole 1192, there is a gap between the clamping protrusion 421 and the clamping hole 1192. The material of the connecting arm 1191 is plastic. When the single cell 11 expands, it will not affect the electrical connection between the tab 40 and the single cell 11, thereby ensuring the electrical connection effect and further improving the safety and stability of the battery. The second clamping member 119 cooperates with the first clamping member 42 to achieve a snap-fit ​​connection between the tab 40 and the pole, while also limiting the relative position of the tab 40 and the pole, facilitating the cooperation between the first tooth structure 118 on the pole and the second tooth structure 41 of the tab 40, thereby increasing the contact area. These two structures act simultaneously to define the relative relationship between the tab 40 and the pole, ensuring the reliability and convenience of the electrical connection. The second clamping member 119 can be provided on both sides of the first tooth structure 118, thereby providing precise positioning on both sides of the first tooth structure 118, facilitating the alignment of the first tooth structure 118 and the second tooth structure 41, and improving installation convenience.

[0046] Specifically, refer to Figure 7As shown, the engaging protrusions 421 face away from each other (defined as the first direction), interlocking with the engaging interface to ensure the secure positioning of the tab 40 and the terminal along the first direction. The engaging protrusions 421 are formed through a through-hole in the tab 40. Multiple engaging protrusions 421 are spaced apart within the through-hole along the stacking direction of the battery cells 11 (defined as the second direction) and positioned on one side of the through-hole along the first direction. The second engaging member 119 is positioned within the through-hole and moved along the first direction so that the engaging hole of the second engaging member 119 aligns with the engaging protrusions 421, thereby defining the position of the tab 40 and the terminal along the second direction. In the thickness direction of the tab, a connecting arm 1191 connects to the engaging hole and abuts against the top surface of the tab. The engagement of the connecting arm 1191 with the top surface of the tab restricts the positional relationship between the tab 40 and the terminal along the thickness direction of the tab, ensuring secure connection in the thickness direction and preventing the tab 40 from separating from the terminal. In addition, a raised second tooth structure 41 is provided at the bottom of the tab, which cooperates with the recessed first tooth structure 118 on the pole, which not only increases the contact area but also avoids position, while also avoiding space occupation in the thickness direction of the tab and saving volume.

[0047] In an alternative embodiment, please refer to Figures 8 to 11 The CCS assembly also includes a collection assembly 50, which includes a collection body 51 and multiple collection branches 52. The collection body 51 is mounted on the first support base 31, and the collection branches 52 are positioned between the first tooth structure 118 and the second tooth structure 41. The number of collection branches 52 corresponds to the number of poles. The collection body 51 is connected to the first support base 31 via an adhesive, but this is not limited to this embodiment.

[0048] The collection branch 52 is positioned between the first tooth structure 118 and the second tooth structure 41, enabling voltage collection between the tab 40 and the collection branch 52 through crimping. This allows the collection assembly 50 to monitor the battery's operating status in real time, improving the safety and reliability of the battery pack 100. By aligning the first tooth structure 118 with the second tooth structure 41 and positioning the collection branch 52 between them, the collection assembly is removably connected and the reliability of the connection between the collection branch 52, the tab 40, and the terminal is improved.

[0049] It should be understood that the above embodiments are exemplary and are not intended to include all possible implementation methods. Various modifications and changes may be made to the above embodiments without departing from the scope of the present disclosure. Similarly, the various technical features of the above embodiments may be arbitrarily combined to form other embodiments of the present application that may not be explicitly described. Therefore, the above embodiments merely express several implementation methods of the present application and do not limit the scope of protection of the patent application.

Claims

1. A battery pack, characterized in that: The battery pack (100) comprises: A battery cell module (10) comprises a plurality of stacked single battery cells (11), wherein the single battery cells (11) comprise a first side surface (111) opposite to an adjacent single battery cell (11), and a second side surface (112) adjacent to the first side surface (111), wherein the second side surface (112) is provided with a first inclined surface (1121) and a second inclined surface (1122); A liquid cooling assembly (20) comprises a plurality of liquid cooling plates (21), a water inlet pipe (22) and a water outlet pipe (23), wherein the liquid inlets (241) of the plurality of liquid cooling plates (21) are all connected to the water inlet pipe (22), and the liquid outlets (251) of the plurality of liquid cooling plates (21) are all connected to the water outlet pipe (23), the liquid cooling plates (21) are attached between the first side surfaces (111) of adjacent single battery cells (11), and the water inlet pipe (22) and the water outlet pipe (23) are respectively arranged on the first inclined surface (1121) and the second inclined surface (1122).

2. The battery pack according to claim 1, wherein: The second side surface (112) comprises a plurality of second sub-side surfaces (1123) connected in sequence, the first inclined surface (1121) and the second inclined surface (1122) are respectively arranged between two adjacent second sub-side surfaces (1123) and are arranged diagonally, and the first inclined surface (1121) and the second inclined surface (1122) are arranged in parallel.

3. The battery pack according to claim 2, wherein: The liquid cooling plate (21) extends and bends at positions corresponding to the first inclined surface (1121) to form a liquid inlet end (24); the liquid inlet (241) is located at the liquid inlet end (24), and the liquid inlet end (24) is attached to the first inclined surface (1121); The liquid cooling plate (21) extends and bends at positions corresponding to the second inclined surface (1122) to form a liquid outlet end (25); the liquid outlet (251) is located at the liquid outlet end (25), and the liquid outlet end (25) is attached to the second inclined surface (1122).

4. The battery pack according to claim 3, wherein: The explosion-proof valve (113) of the single battery cell (11) is arranged on the first inclined surface (1121), and the liquid inlet end (24) covers the explosion-proof valve (113); The explosion-proof valve (113) and the liquid inlet (241) are arranged in a staggered manner.

5. The battery pack according to claim 1, wherein: The liquid cooling plate (21) has a liquid cooling channel (26) inside, and the liquid cooling channel (26) includes a first channel (261) and a second channel (262) connected to each other, the first channel (261) extending along the direction of the water inlet pipe (22) and arranged relatively along the height direction of the single battery cell (11), the second channel (262) is bent to connect two adjacent first channels (261), the liquid inlet (241) is in communication with the first channel (261) with the highest height, and the liquid outlet (251) is in communication with the first channel (261) with the lowest height, so that the cooling liquid can flow from the liquid inlet (241) into the first channel (261) with the highest height, and then flow out from the first channel (261) with the lowest height to the liquid outlet (251).

6. The battery pack according to claim 3, characterized in that: The positive pole (114) and the negative pole (115) of the single cell (11) are respectively arranged on two of the second sub-side surfaces (1123) adjacent to the first inclined surface (1121), and are arranged close to the first inclined surface (1121).

7. The battery pack according to claim 6, characterized in that: The battery pack (100) further includes: A CCS bracket (30) is connected to the single cell (11), comprising a first support seat (31) corresponding to the first inclined surface (1121) and a second support seat (32) connected to both ends of the first support seat (31), wherein the second support seat (32) respectively corresponds to two second sub-side surfaces (1123) adjacent to the first inclined surface (1121); The first support seat (31) is provided with a plurality of first through holes (311), the liquid inlet end (24) is arranged between the first support seat (31) and the first inclined surface (1121), the liquid inlet (241) is exposed from the first through hole (311), and the water inlet pipe (22) is arranged on a side of the first support seat (31) away from the first inclined surface (1121) to communicate with the liquid inlet (241); The second support base (32) is provided with a plurality of second through holes (321), and the battery pack (100) further comprises a tab (40), wherein the second through holes (321) respectively expose the positive electrode column (114) and the negative electrode column (115) to be connected to the tab (40).

8. The battery pack according to claim 7, characterized in that: A first tooth structure (118) is provided on a side of the positive electrode column (114) and the negative electrode column (115) away from the single battery cell (11); The bar (40) is provided with a second tooth structure (41) adapted to the first tooth structure (118).

9. The battery pack according to claim 8, characterized in that: The battery pack (100) further comprises a collection assembly (50), the collection assembly (50) comprising a collection body (51) and a plurality of collection branches (52), the collection body (51) being arranged on the first support seat (31), and the collection branches (52) being arranged between the first tooth structure (118) and the second tooth structure (41).

10. The battery pack according to claim 8, wherein: The bar (40) is provided with a first clamping member (42); The single cell (11) further includes a second clip (119), which is connected to the single cell (11) and is located around the positive electrode (114) and the negative electrode (115). The first clip (42) is clipped to the second clip (119) so that the tab (40) can be detachably connected to the single cell (11).

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