Battery pack

Abstract

This application relates to a battery pack, including a cell module and a liquid cooling assembly. The cell module includes multiple stacked individual cells. Each individual cell includes a first side facing an adjacent cell and a second side adjacent to the first side. The second side has a first inclined surface and a second inclined surface. The liquid cooling assembly includes multiple liquid cooling plates, an inlet pipe, and an outlet pipe. The liquid inlets of the multiple liquid cooling plates are connected to the inlet pipe, and the liquid outlets of the multiple liquid cooling plates are connected to the outlet pipe. The liquid cooling plates are attached between the first sides of adjacent individual cells. The inlet pipe and the outlet pipe are respectively located on the first inclined surface and the second inclined surface, respectively. The ability of the inlet pipe and outlet pipe in the battery pack to be respectively located on the first inclined surface and the second inclined surface of the individual cell maximizes the utilization of the space at the angle of the individual cell, improving the space utilization rate of the battery pack.

Description

Technical Field

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

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

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

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

[0005] In a first aspect, embodiments of this application provide a battery pack, the battery pack comprising:

[0006] A battery cell module includes multiple stacked individual battery cells. Each individual battery cell includes a first side opposite to an adjacent individual battery cell and a second side adjacent to the first side. The second side is provided with a first inclined surface and a second inclined surface.

[0007] The liquid cooling assembly includes multiple liquid cooling plates, an inlet pipe, and an outlet pipe. The liquid inlets of the multiple liquid cooling plates are connected to the inlet pipe, and the liquid outlets of the multiple liquid cooling plates are connected to the outlet pipe. The liquid cooling plates are attached to the first side of adjacent individual battery cells. The inlet pipe and the outlet pipe are respectively disposed on the first inclined surface and the second inclined surface.

[0008] In conjunction with the first aspect of this application, in an optional embodiment, the second side surface includes a plurality of sequentially connected second sub-side surfaces, the first inclined surface and the second inclined surface are respectively disposed between two adjacent second sub-side surfaces and are diagonally disposed, and the first inclined surface and the second inclined surface are parallel to each other.

[0009] In conjunction with the first aspect of this 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 attached to the first inclined surface;

[0010] 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 attached to the second inclined surface.

[0011] In conjunction with the first aspect of this application, in an optional embodiment, the explosion-proof valve of the single battery cell is disposed on the first inclined surface, and the liquid inlet end covers the explosion-proof valve;

[0012] The explosion-proof valve is offset from the liquid inlet.

[0013] In conjunction with the first aspect of this application, in an optional embodiment, the liquid cooling plate has a liquid cooling channel inside, the liquid cooling channel including a first channel and a second channel connected to each other, the first channel extending along the direction of the water inlet pipe and being arranged opposite to each other along the height direction of the individual battery cell, the second channel being curved to connect two adjacent first channels, the liquid inlet communicating with the first channel with the highest height, and the liquid outlet communicating with the first channel with the lowest height, so that the coolant can flow from the liquid inlet into the first channel with the highest height, and after detour, flow out from the first channel with the lowest height to the liquid outlet.

[0014] In conjunction with the first aspect of this application, in an optional embodiment, the positive and negative terminals of the single cell are respectively disposed on two adjacent second sub-side surfaces of the first inclined surface, and are disposed close to the first inclined surface.

[0015] In conjunction with the first aspect of this application, in an optional embodiment, the battery pack further includes:

[0016] CCS bracket, connected to the single cell, includes a first support base corresponding to the first inclined surface and a second support base connected to both ends of the first support base. The second support bases respectively correspond to two second sub-sides adjacent to the first inclined surface.

[0017] The first support base has multiple first through holes, the liquid inlet is located between the first support base and the first inclined surface, the liquid inlet protrudes from the first through holes, and the water inlet pipe is located on the side of the first support base away from the first inclined surface to communicate with the liquid inlet.

[0018] The second support base has multiple second through holes, and the battery pack also includes a switch plate. The second through holes expose the positive terminal and the negative terminal respectively, so as to connect with the switch plate.

[0019] In conjunction with the first aspect of this application, in an optional embodiment, the positive electrode post and the negative electrode post are provided with a first tooth structure on the side away from the single cell;

[0020] The plate is provided with a second tooth structure that is adapted to the first tooth structure.

[0021] In conjunction with the first aspect of this 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 being disposed on the first support base, and the collection branches being disposed between the first tooth structure and the second tooth structure.

[0022] In conjunction with the first aspect of this application, in an optional embodiment, the battery pack is provided with a first snap-fit ​​member; the individual battery cell further includes a second snap-fit ​​member, the second snap-fit ​​member being connected to the individual battery cell and located around the positive terminal and the negative terminal, the first snap-fit ​​member and the second snap-fit ​​member being snapped together so that the battery pack is detachably connected to the individual battery cell.

[0023] The battery pack provided in this application embodiment includes a first side facing an adjacent battery cell and a second side adjacent to the first side. The second side has a first inclined surface and a second inclined surface. A liquid cooling plate is attached between the first sides of the adjacent battery cells. A water inlet pipe and a water outlet pipe are respectively disposed on the first inclined surface and the second inclined surface. The water inlet pipe and the water outlet pipe can be respectively disposed on the first inclined surface and the second inclined surface of the battery cell, so that the space of the inclined part of the battery cell is maximized, improving the space utilization rate of the battery pack, thereby improving the energy density of the battery module. In addition, the liquid cooling plate is attached between the first sides of the adjacent battery cells, so that a single liquid cooling plate contacts the battery cell with the largest area for heat dissipation, achieving fast cooling and heating, which is consistent with high-rate charging and discharging, improving the heat dissipation rate of the battery, and enabling fast charging.

[0024] The liquid inlet and liquid outlet are respectively attached to the first inclined surface and the second inclined surface, which allows the liquid cooling plate to better fit with the individual battery cell, improves heat dissipation efficiency, and improves the space utilization of the individual battery cell.

[0025] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0026] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0027] Figure 1 A side view of the battery pack provided in an embodiment of this application;

[0028] Figure 2 This is a partial exploded view of the battery pack provided in an embodiment of this application;

[0029] Figure 3 for Figure 2Enlarged view of point A in the middle;

[0030] Figure 4 This is a three-dimensional structural diagram of the liquid cooling component in the battery pack according to an embodiment of this application;

[0031] Figure 5 This is a partial structural diagram of the battery pack provided in the embodiments of this application;

[0032] Figure 6 This is a schematic diagram of the CCS assembly structure in the battery pack provided in an embodiment of this application;

[0033] Figure 7 for Figure 6 Enlarged view of point B in the middle;

[0034] Figure 8 This is a cross-sectional schematic diagram of a battery pack provided in an embodiment of this application;

[0035] Figure 9 for Figure 8 Enlarged view of point C in the middle;

[0036] Figure 10 This is a three-dimensional structural diagram of the battery pack provided in an embodiment of this application;

[0037] Figure 11 for Figure 10 Enlarged view of point D in the middle.

[0038] Figure label:

[0039] 100. Battery pack;

[0040] 10. Battery cell 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;

[0041] 113. Explosion-proof valve; 114. Positive terminal; 115. Negative terminal; 118. First tooth structure; 119. Second snap-fit ​​component; 1191. Connecting arm; 1192. Snap-fit ​​hole;

[0042] 20. Liquid cooling assembly; 21. Liquid cooling plate; 22. Water inlet pipe; 23. Water outlet pipe; 24. Liquid inlet end; 241. Liquid inlet port; 25. Liquid outlet end; 251. Liquid outlet port; 26. Liquid cooling channel; 261. First channel; 262. Second channel;

[0043] 30. CCS bracket; 31. First support base; 311. First through hole; 312. Groove; 32. Second support base; 321. Second through hole;

[0044] 40. Bar plate; 41. Second tooth structure; 42. First snap-fit ​​component; 421. Snap-fit ​​protrusion;

[0045] 50. Acquisition component; 51. Acquisition main body; 52. Acquisition branch. Detailed Implementation

[0046] To make the technical solution and beneficial effects of the present invention more apparent and understandable, a detailed description is provided below by listing specific embodiments. The accompanying drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show 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 pertains.

[0047] In the description of this invention, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "height," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this invention and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. That is, they should not be construed as limiting this invention.

[0048] In this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating the relative importance of the indicated features or the number of indicated technical features. Therefore, a feature specified as "first" or "second" can explicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc.; "several" means at least one, such as one, two, three, etc., unless otherwise explicitly specified.

[0049] In this invention, unless otherwise explicitly defined, the terms "installation," "connection," "linking," "fixing," and "setting," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0050] In this invention, unless otherwise explicitly defined, the terms "above," "on top of," "over," "above," "below," "below," "below," or "below" for "first feature above second feature" can refer to the first and second features being in direct contact, or to the first and second features being in indirect contact through an intermediate medium. Furthermore, "above," "over," and "below" for "first feature above second feature" can mean the first feature is directly above or diagonally above the second feature, or simply indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. Similarly, "below," "below," and "below" for "first feature below second feature" can mean the first feature is directly below or diagonally below the second feature, or simply indicates that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0051] This application provides a battery pack 100, please refer to... Figures 1 to 4 The battery pack 100 includes a cell module 10 and a liquid cooling assembly 20. The cell module 10 includes multiple stacked individual cells 11. Each individual cell 11 includes a first side 111 opposite to an adjacent individual cell 11, and a second side 112 adjacent to the first side 111. The second side 112 has a first inclined surface 1121 and a second inclined surface 1122. Specifically, the first side 111 is arranged opposite to each other along the stacking direction of the individual cells 11. The second side 112 is connected to the two first side 111 on both sides along the stacking direction, forming a receiving space with the first side 111 to receive the electrode assembly of the individual cell 11. The electrode assembly typically includes a positive electrode, a negative electrode, and a separator separating the positive and negative electrodes. An electrolyte can be injected into the individual cell 11, allowing the electrolyte to penetrate into the electrode assembly, providing ion migration pathways for electrochemical reactions and providing conductivity. The electrode assembly can be in the form of a wound type, a stacked type, etc. One or more electrode assemblies can be installed within a single battery 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 to the first side surface 111 of adjacent single battery cells 11. 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.

[0052] The first side 111 is the large surface of a single battery cell 11. The liquid cooling plate 21 is located between the first side 111 of adjacent single battery cells 11, which can increase the contact area between the liquid cooling plate 21 and the single battery cell 11, thereby improving the heat dissipation efficiency of the liquid cooling assembly 20 for the single battery cell 11.

[0053] In this embodiment, the inlet pipe 22 and the outlet pipe 23 can be respectively arranged on the first inclined surface 1121 and the second inclined surface 1122 of the single cell 11, so that the space of the inclined part of the single cell 11 is maximized and the space utilization rate of the battery pack 100 is improved. At the same time, the first inclined surface 1121 and the second inclined surface 1122 limit the inlet pipe 22 and the outlet pipe 23 respectively, which improves the stability of the liquid cooling plate 21 and facilitates the installation of water inlet and outlet. In addition, the liquid cooling plate 21 is attached between the first side surface 111 of the adjacent single cell 11, so that the single cooling plate contacts the cell with the largest area for heat dissipation, realizing fast cooling and fast heating, which is consistent with high-rate charging and discharging, improving the heat dissipation rate of the battery and enabling fast charging.

[0054] In an optional embodiment, the second side surface 112 includes a plurality of sequentially connected second sub-side surfaces 1123, with adjacent second sub-side surfaces 1123 arranged at right angles. A first inclined surface 1121 and a second inclined surface 1122 are respectively disposed between two adjacent second sub-side surfaces 1123, arranged diagonally, and the first inclined surface 1121 and the second inclined surface 1122 are parallel to each other. That is, the first inclined surface 1121 and the second inclined surface 1122 are respectively arranged at an angle to two adjacent second sub-side surfaces 1123, and the included angle can be an obtuse angle. Specifically, the angles between the first inclined surface 1121, the second inclined surface 1122, and the two adjacent second sub-side surfaces 1123 can be the same, which can be 135°. Alternatively, the angles between the first inclined surface 1121, the second inclined surface 1122, and the two adjacent second sub-side surfaces 1123 can be different, for example, one is 150° and the other is 120°. These can be set as needed, as long as they are all obtuse angles and the sum of the two angles is 270°, in order to avoid reducing the overall strength and space utilization.

[0055] In this embodiment, the first inclined surface 1121 and the second inclined surface 1122 are diagonally arranged. The inlet pipe 22 and the outlet pipe 23 are respectively attached to the first inclined surface 1121 and the second inclined surface 1122 of the single cell 11, so that the space of the inclined part of the single cell 11 is maximized. At the same time, the liquid cooling plate 21 is limited on both sides, improving 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 flow of coolant and the uniform dissipation of heat. Furthermore, the diagonal arrangement of the first inclined surface 1121 and the second inclined surface 1122, and the provision of the inlet pipe 22 and the outlet pipe 23 respectively, 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 cell 11, and thus improving the heat dissipation effect and efficiency of the single cell 11.

[0056] In an optional embodiment, the liquid cooling plate 21 extends and bends at the 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 the 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 cooling plate 21, including its inlet end 24, outlet end 25, and body, covers three sides of the individual battery cell 11. This structural design allows the liquid cooling plate 21 to better fit the individual battery cell 11, not only on the first side 111 but also on the second side 112, improving heat dissipation efficiency. Furthermore, the relative positioning of the inlet end 24 and outlet end 25 with the first inclined surface 1121 and the second inclined surface 1122 enhances the stability of the liquid cooling plate during operation. Qualitative measures are taken to prevent poor contact between the liquid cooling plate 21 and the individual battery cell 11 due to vibration or impact. 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. This allows the space of the inclined portion of the individual battery cell 11 to be maximized, further improving the space utilization rate of the individual battery cell 11 and the energy density of the individual battery cell 11.

[0057] In one alternative embodiment, please refer to Figures 3 to 5 The liquid cooling plate 21 has liquid cooling channels 26 inside, which include a first channel 261 and a second channel 262 that are connected to each other. The first channel 261 is along the direction of the water inlet pipe 22 (that is, Figure 5 (as shown by arrow s1) extends along the height direction of the single cell 11 (that is, ... Figure 5 The second flow channel 262 is arranged in a curved manner to connect two adjacent first flow channels 261 (as shown by arrow s2 in the figure). The inlet 241 flows through the highest first flow channel 261, and the outlet 251 is connected to the lowest first flow channel 261, so that the coolant can flow from the inlet 241 into the highest first flow channel 261, and after detour, flow out from the lowest first flow channel 261 to the outlet 251.

[0058] In this embodiment, the inlet pipe 22 is located above the outlet pipe 23, allowing the coolant entering from the inlet pipe 22 to flow to the outlet pipe 23 under gravity. This reduces local resistance during coolant flow, improves the flow velocity and smoothness of the coolant within the liquid cooling channel 26, and further enhances the heat dissipation effect on the individual 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 flow resistance, avoid energy loss and bubble accumulation, and improve temperature distribution uniformity.

[0059] Figure 5 The arrows shown represent the flow direction of the coolant. That is, the coolant enters the first flow channel 261 from the inlet pipe 22 through the inlet port 241 on the inlet end 24 of the multiple individual cells 11, then enters the second flow channel 262 from the first flow channel 261, and after meandering in the curved structure of the second flow channel 262, it enters the 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 individual cells 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. The inlet end and outlet end can be set through these two spaces, thereby reducing the overall space occupied by the battery pack 100, improving the space utilization rate, and thus improving the energy density of the battery module.

[0060] The structural design of the first flow channel 261 and the second flow channel 262 in this embodiment can not only increase the overall flow length of the liquid cooling channel 26, but also reduce the flow resistance and allow the coolant to circulate fully in the liquid cooling plate 21, thereby improving temperature uniformity and heat dissipation efficiency.

[0061] In one alternative embodiment, please refer to Figure 2 and Figure 3 The positive electrode 114 and negative electrode 115 of the individual battery cell 11 are respectively disposed on two adjacent second sub-side surfaces 1123 of the first inclined surface 1121, and are positioned close to the first inclined surface 1121. This design makes the electrode leads more concentrated, reduces the distance between the positive electrode 114 and the negative electrode 115, and thus reduces the overall volume of the CCS assembly. This not only reduces the material cost of the CCS assembly, but also facilitates subsequent connection and management. The height of the first inclined surface 1121 is greater than that of the second inclined surface 1122, that is, the first inclined surface 1121 is the higher inclined surface in the height direction of the individual battery cell 11. The placement of the positive electrode 114 and the negative electrode 115 close to the first inclined surface 1121 also facilitates the installation of the CCS assembly and improves installation convenience.

[0062] In one alternative embodiment, please refer to Figures 6 to 11The battery pack 100 also includes a CCS assembly, which includes a CCS bracket 30 connected to a single battery cell 11. The CCS bracket 30 includes a first support 31 corresponding to a first inclined surface 1121 and a second support 32 connected to both ends of the first support 31. The second support 32 corresponds to two second sub-sides 1123 adjacent to the first inclined surface 1121. The first support 31 has multiple first through holes 311. The liquid inlet 24 is located between the first support 31 and the first inclined surface 1121. The liquid inlet 241 protrudes from the first through holes 311. The water inlet pipe 22 is located on the side of the first support 31 away from the first inclined surface 1121 to communicate with the liquid inlet 241. The second support 32 has multiple second through holes 321. The battery pack 100 also includes a electrode plate 40. The second through holes 321 respectively expose the positive electrode post 114 and the negative electrode post 115 to connect with the electrode plate 40.

[0063] The design of the CCS bracket 30 in this embodiment not only provides support for the inlet pipe 22 and the outlet pipe 23, but also facilitates electrode connection. In addition, the first support 31 corresponds to the first inclined surface 1121, and the two second support 32 correspond to the two second sub-side surfaces 1123 respectively. The CCS bracket 30 can be adapted to the positive terminal post 114 and the negative terminal post 115, thereby reducing the overall space occupied by the battery pack 100 while ensuring the connection stability of the battery pack 100.

[0064] The first support base 31 and the second support base 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, forming a three-sided contact structure. This not only improves the installation convenience of the CCS bracket 30 but also enhances its installation reliability. Meanwhile, the liquid inlet end 24 is located between the first support base 31 and the first inclined surface 1121, further improving the reliability of the liquid inlet end 24 and preventing displacement or warping. Furthermore, the water inlet pipe 22 is located on the side of the first support base 31 facing away from the first inclined surface 1121, directly connecting to the liquid inlet port 241 of the liquid inlet end 24. This shortens the water pipe length, reduces the risk of leakage, and improves installation convenience.

[0065] In one alternative embodiment, please refer to Figure 6 and Figure 7The CCS bracket 30 is also provided with multiple grooves 312. The grooves 312 are spaced apart along the stacking direction of the individual cells 11. The grooves 312 are connected to the second through holes 321 provided on the second support base 32. The second through holes 321 correspond to the terminals of the individual cells. The grooves 312 are adapted to the pads 40. The depth of the grooves 312 is less than or equal to the thickness of the pads 40, and the length and width of the grooves 312 are adapted to the length and width of the pads 40. The pads 40 are placed in the grooves 312, which can improve the overall appearance consistency of the CCS assembly, reduce the overall space occupied by the CCS assembly, and limit the pads 40.

[0066] In one alternative embodiment, please refer to Figures 6 to 9 The positive electrode post 114 and the negative electrode post 115 are provided with a first tooth structure 118 on the side away from the single cell 11. The electrode plate 40 is provided with a second tooth structure 41 that is adapted to the first tooth structure 118.

[0067] The first tooth structure 118 extends from the second through hole 321. The first tooth structure 118 and the second tooth structure 41 are engaged to achieve electrical connection between the electrode plate 40 and the pole post. This can increase the contact area between the pole post and the electrode plate 40 and improve the connection reliability. At the same time, the groove 312 limits the electrode plate 40, which can improve the convenience of installation and alignment and avoid the problem of misalignment.

[0068] In one alternative embodiment, please refer to Figure 2 , Figure 8 and Figure 9 The explosion-proof valve 113 of the individual battery 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 offset. That is, the explosion-proof valve 113 and the liquid inlet 241 of the liquid inlet end 24 do not directly correspond. This design can ensure the normal operation of the explosion-proof valve 113, and can greatly reduce the risk of the explosion-proof valve 113 directly breaking through the connection of the liquid inlet 241, thus playing a certain buffering role and improving safety.

[0069] In one alternative embodiment, please refer to Figure 7 , Figure 9 and Figure 11 The battery pack 40 is provided with a first snap-fit ​​connector 42, and the individual battery cell 11 also includes a second snap-fit ​​connector 119. The second snap-fit ​​connector 119 is connected to the individual battery cell 11 and is located around the positive terminal 114 and the negative terminal 115. The first snap-fit ​​connector 42 and the second snap-fit ​​connector 119 are snapped together so that the battery pack 40 can be detachably connected to the individual battery cell 11.

[0070] In this embodiment, the individual battery cell 11 and the battery pack 40 are detachably connected via a first snap-fit ​​connector 42 and a second snap-fit ​​connector 119, facilitating quick disassembly and assembly and improving the convenience of battery pack 100 maintenance and replacement. The second snap-fit ​​connector 119 is fixed to the positive terminal 114 and negative terminal 115 of the individual battery cell 11. The two second snap-fit ​​connectors 119 can be positioned on opposite sides of the terminals to improve snap-fit ​​reliability. Specifically, the second snap-fit ​​connector 119 can be connected to the terminals via nano-injection molding or adhesive bonding, depending on the requirements.

[0071] The second snap-fit ​​component 119 is a connecting arm 1191 with multiple snap-fit ​​holes 1192. The connecting arm 1191 can improve the structural reliability of the snap-fit ​​holes 1192. The first snap-fit ​​component 42 is a snap-fit ​​protrusion 421 that can be inserted into the snap-fit ​​hole 1192. When the snap-fit ​​protrusion 421 is inserted into the snap-fit ​​hole 1192, there is a gap between the snap-fit ​​protrusion 421 and the snap-fit ​​hole 1192. The connecting arm 1191 is made of plastic. When the single cell 11 expands, it will not affect the electrical connection between the plate 40 and the single cell 11, ensuring the electrical connection effect and further improving the safety and stability of the battery. The engagement of the second snap-fit ​​connector 119 and the first snap-fit ​​connector 42 enables the snap-fit ​​connection between the contact plate 40 and the electrode post. Simultaneously, it limits the relative position of the contact plate 40 and the electrode post, facilitating the engagement of the first tooth structure 118 on the electrode post and the second tooth structure 41 on the contact plate 40, increasing the contact area. These two structures work together to define the relative relationship between the contact plate 40 and the electrode post, ensuring reliable and convenient electrical connection. The second snap-fit ​​connector 119 can be positioned on both sides of the first tooth structure 118, providing precise positioning on both sides of the first tooth structure 118, facilitating the alignment and engagement of the first tooth structure 118 and the second tooth structure 41, and improving installation convenience.

[0072] For details, please refer to Figure 7As shown, the snap-fit ​​protrusions 421 are oriented in opposite directions (defined as the first direction) and interlock with the snap-fit ​​interface to ensure the positional reliability of the battery pack 40 and the electrode post along the first direction. Simultaneously, the snap-fit ​​protrusions 421 are formed through through holes on the battery pack 40. Multiple snap-fit ​​protrusions 421 are spaced apart within the through holes along the stacking direction of the individual battery cells 11 (defined as the second direction) and positioned on one side of the through hole along the first direction. The second snap-fit ​​member 119 is placed within the through hole and moved along the first direction so that its snap-fit ​​hole aligns with the snap-fit ​​protrusion 421, thus limiting the position of the battery pack 40 and the electrode post along the second direction. In the thickness direction of the battery pack, the connecting arm 1191 connects to the snap-fit ​​hole and abuts against the top surface of the battery pack. The engagement of the connecting arm 1191 with the top surface of the battery pack restricts the positional relationship between the battery pack 40 and the electrode post in the thickness direction, ensuring connection reliability in the thickness direction and preventing the battery pack 40 from detaching from the electrode post. In addition, a raised second tooth structure 41 is provided at the bottom of the bar, which cooperates with the recessed first tooth structure 118 on the pole post. This not only increases the contact area but also avoids positional issues and prevents the bar from occupying space in the thickness direction, thus saving volume.

[0073] In one alternative embodiment, please refer to Figures 8 to 11 The CCS assembly also includes a data acquisition component 50, which comprises a data acquisition body 51 and multiple data acquisition branches 52. The data acquisition body 51 is disposed on a first support base 31, and the data acquisition branches 52 are disposed between a first tooth structure 118 and a second tooth structure 41. The number of data acquisition branches 52 corresponds to the number of pole posts. The data acquisition body 51 is connected to the first support base 31 by adhesive, but this is not the only method of connection.

[0074] The acquisition branch 52 is positioned between the first tooth structure 118 and the second tooth structure 41, enabling voltage acquisition between the electrode plate 40 and the acquisition branch 52 via a press-fit connection. The acquisition assembly 50 can monitor the battery's operating status in real time, improving the safety and reliability of the battery pack 100. By utilizing the cooperation of the first tooth structure 118 and the second tooth structure 41, the acquisition branch 52 is positioned between them, achieving not only a detachable connection for the acquisition assembly but also improving the reliability of the connection between the acquisition branch 52, the electrode plate 40, and the terminal post.

[0075] It should be understood that the above embodiments are exemplary and not intended to encompass all possible implementations. Various modifications and changes can be made to the above embodiments without departing from the scope of this disclosure. Similarly, the various technical features of the above embodiments can be arbitrarily combined to form other embodiments of this application that may not be explicitly described. Therefore, the above embodiments only illustrate several implementations of this application and do not limit the scope of protection of this patent application.

Claims

1. A battery pack, characterized in that, The battery pack (100) includes: The battery cell module (10) includes a plurality of stacked individual battery cells (11). Each individual battery cell (11) includes a first side surface (111) opposite to an adjacent individual battery 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). 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 to the first side (111) of the adjacent single cell (11). 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).

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

3. The battery pack according to claim 2, characterized in that, The liquid cooling plate (21) extends and bends at the position 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 the position corresponding to the second inclined surface (1122) to form a liquid outlet (25), the liquid outlet (251) is located at the liquid outlet (25), and the liquid outlet (25) is attached to the second inclined surface (1122).

4. The battery pack according to claim 3, characterized in that, 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) is offset from the liquid inlet (241).

5. The battery pack according to claim 1, characterized in that, 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) that are connected to each other. The first channel (261) extends along the direction of the water inlet pipe (22) and is arranged opposite to each other along the height direction of the single cell (11). The second channel (262) is bent to connect two adjacent first channels (261). The liquid inlet (241) flows with the first channel (261) with the highest height, and the liquid outlet (251) is connected with the first channel (261) with the lowest height, so that the coolant can flow from the liquid inlet (241) into the first channel (261) with the highest height, and after detour, 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 terminal (114) and negative terminal (115) of the single cell (11) are respectively disposed on two adjacent second sub-side surfaces (1123) of the first inclined surface (1121) and are disposed close to the first inclined surface (1121).

7. The battery pack according to claim 6, characterized in that, The battery pack (100) also includes: CCS bracket (30), connected to the single cell (11), includes a first support (31) corresponding to the first inclined surface (1121) and a second support (32) connected to both ends of the first support (31). The second support (32) corresponds to two second sub-side surfaces (1123) adjacent to the first inclined surface (1121). The first support base (31) has multiple first through holes (311), the liquid inlet end (24) is located between the first support base (31) and the first inclined surface (1121), the liquid inlet (241) protrudes from the first through hole (311), and the water inlet pipe (22) is located on the side of the first support base (31) away from the first inclined surface (1121) to communicate with the liquid inlet (241); The second support base (32) has multiple second through holes (321), and the battery pack (100) also includes a plate (40). The second through holes (321) expose the positive terminal (114) and the negative terminal (115) respectively, so as to connect with the plate (40).

8. The battery pack according to claim 7, characterized in that, The positive electrode post (114) and the negative electrode post (115) are provided with a first tooth structure (118) on the side away from the single cell (11). The bar plate (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) also includes a collection component (50), which includes a collection body (51) and multiple collection branches (52). The collection body (51) is disposed on the first support base (31), and the collection branches (52) are disposed between the first tooth structure (118) and the second tooth structure (41).

10. The battery pack according to claim 8, characterized in that, The bar plate (40) is provided with a first snap-fit ​​member (42); The single cell (11) further includes a second snap-fit ​​(119), which is connected to the single cell (11) and located around the positive terminal (114) and the negative terminal (115). The first snap-fit ​​(42) snaps into the second snap-fit ​​(119) so that the bar plate (40) can be detachably connected to the single cell (11).

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