A battery pack

Abstract

The application discloses a battery pack, comprising: a shell, a plurality of battery cells, a plurality of busbars and a circuit board; the shell is internally provided with a receiving cavity, the plurality of battery cells are arranged in the receiving cavity in a first direction, the circuit board is arranged in the receiving cavity, one side of the receiving cavity in a second direction is provided with a cavity opening, the circuit board is arranged in the receiving cavity and located at the side of the battery cells facing the cavity opening, a plurality of busbars are arranged on the side of the circuit board away from the battery cells, and the plurality of busbars are electrically connected with the circuit board; the battery cell comprises a battery cell body and a tab arranged at one end of the battery cell body facing the circuit board, the tabs of the two adjacent battery cells are at least partially attached to form a connecting part, and the connecting part penetrates through the circuit board and is electrically connected with one busbar. By at least partially attaching the tabs of the two adjacent battery cells to form the connecting part and connecting the connecting part with the busbar through the circuit board, the complexity of the connecting structure between the battery cell and the circuit board can be simplified, and the actual assembly operation is facilitated.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to a battery pack. Background Technology

[0002] With the continuous development of new energy technologies, lithium-ion batteries are widely used in various fields due to their high energy density and long lifespan. Among lithium-ion batteries, pouch batteries have the advantages of high safety, high energy density, and long lifespan.

[0003] In related technologies, battery packs typically separate the cell modules and the BMS (Battery Management System) module, placing them in different chambers within the pack housing. Multiple cells are connected in series and parallel using busbars, and the collected signals are transmitted to the BMS module via wiring harnesses or flexible circuit boards. However, in these battery pack technologies, the connection structure between the BMS module and the cells is relatively complex, facilitating assembly and requiring significant space within the pack, thus reducing its energy density. Utility Model Content

[0004] This application aims to provide a battery pack that can solve the problem that in related technologies, the connection structure between the BMS module and the battery cells is relatively complex, which is inconvenient for assembly and requires a large amount of space within the battery pack.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows:

[0006] This application provides a battery pack comprising: a housing, multiple battery cells, a busbar, and a circuit board; the battery pack has a first direction and a second direction that are perpendicular to each other;

[0007] The housing has a receiving cavity, and a plurality of battery cells are arranged at intervals in the receiving cavity along the first direction. The circuit board is disposed in the receiving cavity. The receiving cavity has an opening on one side along the second direction. The circuit board is disposed in the receiving cavity and is located on the side of the battery cells facing the opening. A plurality of busbars are arranged at intervals on the side of the circuit board away from the battery cells. The plurality of busbars are electrically connected to the circuit board.

[0008] The battery cell includes a battery cell body and a tab disposed on one end of the battery cell body facing the circuit board. The tabs of two adjacent battery cells are at least partially attached to form a connection portion, which passes through the circuit board and is electrically connected to one of the busbars.

[0009] Optionally, the electrode includes a first section and a second section, the first section being connected to the battery cell body, and the second section being connected to the end of the first section away from the battery cell body;

[0010] The two interconnected electrodes are a first sub-electrode and a second sub-electrode, and the second segment of the first sub-electrode and the second segment of the second sub-electrode are fitted together to form the connecting portion; there is a gap between the first segment of the first sub-electrode and the first segment of the second sub-electrode.

[0011] Optionally, the first segment includes a vertical segment and a bent segment. One end of the vertical segment is connected to the battery cell body, and the other end of the vertical segment extends along the second direction away from the battery cell body. The bent segment is connected to the other end of the vertical segment, and the bent segment and the vertical segment are bent together. The second segment is connected to the bent segment.

[0012] Optionally, the bent section and the vertical section are set at an obtuse angle;

[0013] And / or, an arc transition section is provided between the vertical section and the bending section.

[0014] Optionally, the bent sections of the first sub-electrode and the second sub-electrode are bent in a direction that approaches each other.

[0015] Optionally, the battery pack further has a third direction, which is perpendicular to the first direction and the second direction respectively; each cell is provided with two tabs, which are a positive tab and a negative tab, and the positive tab and the negative tab are spaced apart along the third direction, and the bending section of the positive tab is bent in the opposite direction to the bending section of the negative tab.

[0016] Optionally, the connecting portion includes an extension section and a welding section. The circuit board has a through hole, the extension section passes through the through hole, the welding section is connected to the end of the extension section away from the battery cell body, the welding section is bent from the extension section, and the welding section is welded and fixed to the side of the busbar away from the circuit board.

[0017] Optionally, the battery pack further has a third direction perpendicular to the first direction and the second direction respectively; the busbar includes a main body and a busbar portion, the main body extends along the first direction and is electrically connected to the circuit board, the busbar portion is disposed on one side of the main body along the third direction, one end of the busbar portion is connected to the main body, the other end of the busbar portion extends along the third direction in a direction away from the main body, and the welding section is welded and fixed to the busbar portion.

[0018] Optionally, the busbar is provided with a plurality of busbar sections, each of which is located on one side of the main body along the third direction, and the plurality of busbar sections are arranged at intervals along the first direction, and the welding segment of each connecting part is welded and fixed to one of the busbar sections.

[0019] Optionally, the circuit board has a via at a position corresponding to each of the busbars, and the via is located on one side of the busbar along the first direction; the extension of each of the connecting parts passes through one of the vias, and the welding section is welded and fixed to the side of the busbar away from the circuit board.

[0020] Optionally, all the welded segments formed by the tabs are bent in the same direction.

[0021] Optionally, the battery pack further includes BMS components, which are disposed on the circuit board and electrically connected to the circuit board; and / or, the battery cell is a pouch cell.

[0022] In the embodiments of this application, multiple battery cells are arranged in the receiving cavity of the housing to form a battery cell group. A circuit board is placed on the side of the battery cell group facing the cavity opening. Multiple spaced busbars are integrated on the side surface of the circuit board away from the battery cell group. Furthermore, by at least partially attaching the tabs of two adjacent battery cells to form a connection portion, and allowing the connection portion to pass through the circuit board and connect to the busbar, the complexity of the connection structure between the battery cell and the circuit board can be simplified. This also facilitates the connection and fixation of the battery cell tabs and the busbar, making actual assembly operations easier. At the same time, it can reduce the internal space of the battery pack occupied by the circuit board and busbars, which helps to improve the energy density of the battery pack.

[0023] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments will be briefly introduced below, wherein:

[0025] Figure 1 This is an exploded view of a battery pack according to an embodiment of this application;

[0026] Figure 2 This is a schematic diagram of the connection structure between the battery cell and the circuit board in the battery pack according to an embodiment of this application;

[0027] Figure 3This is a partial schematic diagram of the connection structure between the battery cell and the circuit board according to an embodiment of this application;

[0028] Figure 4 This is a schematic diagram of the circuit board structure according to an embodiment of this application;

[0029] Figure 5 This is a schematic diagram of the connection of multiple battery cells according to an embodiment of this application;

[0030] Figure 6 This is a partial structural schematic diagram of a battery cell according to an embodiment of this application;

[0031] Figure 7 This is a schematic diagram of a tab structure according to an embodiment of this application;

[0032] Figure 8 This is a schematic diagram of another structure of the tab according to an embodiment of this application;

[0033] Figure 9 This is a schematic diagram of the connection structure of two interconnected electrodes according to an embodiment of this application.

[0034] Figure label:

[0035] 1: Housing; 11: Receiving cavity; 2: Battery cell; 21: Battery cell body; 22: Tab; 221: First section; 2211: Vertical section; 2212: Bending section; 2213: Arc transition section; 222: Second section; 223: Connecting part; 2231: Extension section; 2232: Welding section; 22a: First sub-tab; 22b: Second sub-tab; 22c: Positive tab; 22d: Negative tab; 3: Circuit board; 301: Via; 31: Busbar; 311: Main body; 312: Busbar; 32: BMS component; 4: Top cover; X: First direction; Y: Second direction; Z: Third direction. Detailed Implementation

[0036] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0037] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0038] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0039] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0040] The battery pack provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0041] like Figures 1-5 As shown, a battery pack according to some embodiments of this application includes: a housing 1, a plurality of battery cells 2, a busbar 31, and a circuit board 3; the battery pack has a first direction X and a second direction Y that are perpendicular to each other; the housing 1 is provided with a receiving cavity 11, the plurality of battery cells 2 are arranged at intervals along the first direction X in the receiving cavity 11, the circuit board 3 is disposed in the receiving cavity 11, the receiving cavity 11 is provided with an opening on one side along the second direction Y, the circuit board 3 is disposed in the receiving cavity 11 and is located on the side of the battery cells 2 facing the opening, the side of the circuit board 3 facing away from the battery cells 2 is provided with a plurality of busbars 31 arranged at intervals, and the plurality of busbars 31 are electrically connected to the circuit board 3; the battery cell 2 includes a battery cell body 21 and a tab 22 disposed on one end of the battery cell body 21 facing the circuit board 3, the tabs 22 of two adjacent battery cells 2 are at least partially attached to form a connection portion 223, the connection portion 223 passes through the circuit board 3 and is electrically connected to a busbar 31.

[0042] In the embodiments of this application, multiple battery cells 2 are arranged in the receiving cavity 11 of the housing 1 to form a battery cell group. A circuit board 3 is placed on the side of the battery cell group facing the cavity 11. Multiple spaced busbars 31 are integrated on the side surface of the circuit board 3 away from the battery cell group. Furthermore, by at least partially attaching the tabs 22 of two adjacent battery cells 2 to form a connection portion 223, and by connecting the connection portion 223 through the circuit board 3 to the busbar 31, the complexity of the connection structure between the battery cells 2 and the circuit board 3 can be simplified. At the same time, it is also convenient to connect and fix the tabs 22 of the battery cells 2 to the busbar 31, which facilitates the actual assembly operation. At the same time, it can also reduce the internal space of the battery pack occupied by the circuit board 3 and the busbar 31, which helps to improve the energy density of the battery pack.

[0043] It is understood that the battery cell 2 in this embodiment is a pouch cell. Pouch cells use aluminum-plastic film as the outer casing material to replace the traditional metal casing, offering advantages such as lightweight, flexibility, and high energy density. Of course, other types of battery cells 2 in this application can also be used, and can be flexibly selected according to application needs; no limitation is made here.

[0044] Specifically, such as Figure 1 and Figure 2 As shown, the battery pack has a first direction X, a second direction Y, and a third direction Z that are perpendicular to each other. The battery pack includes a housing 1, a top cover 4, and multiple battery cells 2. The housing 1 has a receiving cavity 11, and the receiving cavity 11 has an opening on one side along the second direction Y. The top cover 4 covers the opening of the receiving cavity 11, so that the top cover 4 and the housing 1 enclose a closed receiving space. The multiple battery cells 2 are disposed in the receiving space and are stacked along the first direction X. The receiving cavity 11 has a circuit board 3 on the side of the multiple battery cells 2 facing the top cover 4, and the side of the circuit board 3 facing away from the battery cells 2 has multiple busbars 31.

[0045] Among them, such as Figure 5 and Figure 6 As shown, the battery cell 2 includes a battery cell body 21 and a tab 22 disposed on the side of the battery cell body 21 facing the circuit board 3. Each battery cell 2 is provided with two tabs 22, which are arranged at intervals along the third direction Z. The tabs 22 of two adjacent battery cells 2 are arranged opposite each other. One tab 22 of the latter battery cell 2 is at least partially attached to one tab 22 of the former battery cell 2 to form a tab group. The end of the tab group away from the battery cell body 21 forms a connection part 223. The connection part 223 passes through the circuit board 3 and is electrically connected to a busbar 31 on the circuit board 3. Thus, multiple battery cells 2 can be connected in series and / or in parallel by using the busbar 31 on the circuit board 3.

[0046] In some embodiments, such as Figure 3 and Figure 4As shown, the circuit board 3 in this application can be the circuit board 3 in the BMS module. The BMS module also includes BMS components 32. The BMS components 32 are disposed on the circuit board 3 and electrically connected to the circuit board 3. The BMS module is disposed in the receiving cavity 11 and is located on the side of the battery cell 2 facing the top cover 4. The state of the battery cell 2 can be monitored, controlled and optimized through the BMS module. In this application, by placing the BMS module and the battery cell 2 in the same receiving cavity 11, the internal space of the battery pack is saved, thereby improving the energy density of the battery pack.

[0047] Furthermore, by integrating multiple busbars 31 onto the circuit board 3 and allowing the tabs 22 to pass through the circuit board 3 and form an electrical connection with the busbars 31, this application can save the wiring harness or FPC required for electrical connection compared to traditional battery packs, simplifying the connection structure within the battery pack. This not only saves space but also facilitates actual assembly operations.

[0048] In some embodiments, such as Figure 5 and Figure 6 As shown, each battery cell 2 has two tabs 22, one of which is a positive tab 22c and the other is a negative tab 22d. The positive tab 22c and the negative tab 22d are arranged at intervals along the third direction Z, and the two tabs 22 of two adjacent battery cells 2 correspond one-to-one. The corresponding positions of the tabs 22 of two adjacent battery cells 2 can be flexibly set according to the series and parallel connection requirements of two adjacent battery cells 2.

[0049] For example, taking three battery cells 2 as an example, the positive tab 22c of the second battery cell 2 can be connected to the positive tab 22c of the first battery cell 2 to form a tab group. The end of the tab group away from the battery cell 2 is provided with a connection part 223. The negative tab 22d of the second battery cell 2 can be connected to the negative tab 22d of the third battery cell 2 to form a tab group. The end of the tab group away from the battery cell 2 is provided with a connection part 223. Then, the two connection parts 223 formed are electrically connected to the corresponding busbars 31 on the circuit board 3, while the negative tab 22d of the first battery cell 2 and the positive tab 22c of the third battery cell 2 are each connected to the corresponding busbars 31 through the circuit board 3. In this way, the electrical connection of the three battery cells 2 is realized.

[0050] For example, taking three battery cells 2 as an example, the positive tab 22c of the second battery cell 2 can be connected to the negative tab 22d of the first battery cell 2 to form a tab group. The end of the tab group away from the battery cell 2 is provided with a connecting part 223. The negative tab 22d of the second battery cell 2 can be connected to the positive tab 22c of the third battery cell 2 to form a tab group. The end of the tab group away from the battery cell 2 is provided with a connecting part 223. Then, the two connecting parts 223 formed are electrically connected to the corresponding busbars 31 on the circuit board 3, while the positive tab 22c of the first battery cell 2 and the negative tab 22d of the third battery cell 2 pass through the circuit board 3 and are electrically connected to the corresponding busbars 31. In this way, the electrical connection of the three battery cells 2 is realized.

[0051] It should be noted that multiple battery cells 2 can be connected in series or in parallel. The specific connection structure of multiple battery cells 2 can be flexibly selected according to the design requirements of the battery pack, and is not limited here.

[0052] In addition, the circuit board 3 is provided with multiple busbars 31. Each busbar 31 can be connected to one or more tab groups or tabs 22. The tabs 22 and the busbars 31 can be electrically connected by means of soldering, bonding, plugging, etc. The specific connection method can be flexibly set according to actual needs and is not limited here.

[0053] Optionally, such as Figures 6 to 8 As shown, the electrode 22 includes a first segment 221 and a second segment 222. The first segment 221 is connected to the cell body 21, and the second segment 222 is connected to the end of the first segment 221 away from the cell body 21; as shown Figure 9 As shown, the two interconnected tabs 22 are a first sub-tab 22a and a second sub-tab 22b, respectively. The second segment 222 of the first sub-tab 22a and the second segment 222 of the second sub-tab 22b are fitted together to form a connecting part 223; there is a gap between the first segment 221 of the first sub-tab 22a and the first segment 221 of the second sub-tab 22b.

[0054] In this embodiment, two interconnected tabs 22 form a tab group. By fitting the second segments 222 of the two tabs 22 together to form a connecting portion 223, it is easier to pass the connecting portion 223 through the circuit board 3 and electrically connect it to the busbar 31. This facilitates the connection operation between the tab group and the circuit board 3 and the busbar 31. At the same time, a gap is maintained between the first segments 221 of the two tabs 22 in the tab group to allow for deformation of the tabs 22. This allows the tabs 22 to deform into the gap during battery pack assembly, preventing redundant tabs 22 from being inserted inward into the cell body 21 and causing a short circuit, thereby improving the safety performance of the battery pack.

[0055] Optionally, such as Figures 6 to 8 As shown, the first segment 221 includes a vertical segment 2211 and a bent segment 2212. One end of the vertical segment 2211 is connected to the cell body 21, and the other end of the vertical segment 2211 extends along the second direction Y in a direction away from the cell body 21. The bent segment 2212 is connected to the other end of the vertical segment 2211, and the bent segment 2212 is bent from the vertical segment 2211. The second segment 222 is connected to the bent segment 2212.

[0056] In this embodiment, the first segment 221 of the tab 22 includes a vertical segment 2211 and a bent segment 2212. The vertical segment 2211 extends from the cell body 21 along the second direction Y toward the circuit board 3. One end of the bent segment 2212 is connected to the end of the vertical segment 2211 away from the cell body 21. The other end of the bent segment 2212 extends obliquely toward the circuit board 3, so that the bent segment 2212 and the vertical segment 2211 are bent, that is, the bent segment 2212 and the vertical segment 2211 are set at a certain angle. The second segment 222 is connected to the bent segment 2212. In this way, by forming a bent structure between the bent section 2212 and the vertical section 2211, when the tab 22 as a whole is subjected to a tensile or compressive force along the second direction Y, the force along the second direction Y can be decomposed into forces in other directions by the change in angle between the bent section 2212 and the vertical section 2211, thereby reducing stress concentration in the tab 22 and preventing local cracking of the tab 22.

[0057] In some embodiments, such as Figure 7 As shown, the bending angle R between the bent segment 2212 and the vertical segment 2211 is set to an obtuse angle, that is, the bending angle R satisfies: 90° < R < 180°. For example, the bending angle R can be set to: 95°, 120°, 135°, 145°, 160°, 175°, etc. By setting the bending angle R to an obtuse angle, the force can be dispersed by the change of the bending angle R when the tab 22 is subjected to external force. At the same time, it also avoids the bending angle R being too small, which would cause the tab 22 to easily break at the bending point.

[0058] It should be noted that the bending angle R in different tabs 22 can be set to the same or different, and can be flexibly set according to actual needs. No limitation is made here.

[0059] In other embodiments, such as Figure 7 and Figure 8As shown, an arc transition section 2213 is provided between the vertical section 2211 and the bent section 2212. By providing the arc transition section 2213 between the vertical section 2211 and the bent section 2212, the connection and transition between the vertical section 2211 and the bent section 2212 can be smoothed, thereby avoiding stress concentration at the connection between the vertical section 2211 and the bent section 2212 and reducing the risk of breakage of the tab 22 at the connection between the vertical section 2211 and the bent section 2212.

[0060] Optionally, such as Figure 9 As shown, the bent section 2212 of the first sub-taper 22a and the bent section 2212 of the second sub-taper 22b are bent toward each other.

[0061] In this embodiment, two interconnected tabs 22 form a tab group. By bending the bent sections 2212 of the two tabs 22 in the tab group toward each other, when the tab group is subjected to tensile or compressive forces, the two tabs 22 in the tab group can deform in different directions, which helps to better disperse the external forces and thus protect the tabs 22 and help to extend the service life of the tabs 22.

[0062] Optionally, such as Figure 6 As shown, the battery pack also has a third direction Z, which is perpendicular to the first direction X and the second direction Y respectively; each cell 2 is provided with two tabs 22, which are positive tab 22c and negative tab 22d respectively. The positive tab 22c and negative tab 22d are arranged at intervals along the third direction Z, and the bending section 2212 of the positive tab 22c and the bending section 2212 of the negative tab 22d are bent in opposite directions.

[0063] In this embodiment of the application, by setting the bending segments 2212 of the positive tab 22c and the negative tab 22d on the same battery cell 2 to be bent in opposite directions, such as... Figure 6 As shown, the positive tab 22c of the battery cell 2 is bent to the left, and the negative tab 22d is bent to the right. In this way, when the tabs 22 are subjected to a tensile or compressive force along the second direction Y, the deformation of the bent sections 2212 of the positive and negative tabs 22c and 22d disperses the force in opposite directions, thus balancing the overall force on the battery cell 2 and preventing displacement. Simultaneously, this structural design facilitates the connection and mating of the tabs 22 of adjacent battery cells 2, simplifying assembly operations.

[0064] It should be noted that the bending angle R of the bending segment 2212 of the positive tab 22c and the negative tab 22d on the same cell 2 relative to the corresponding vertical segment 2211 can be set to be the same or different, and no limitation is made here.

[0065] Optionally, such as Figure 9 As shown, the connecting part 223 includes an extension section 2231 and a soldering section 2232, and the circuit board 3 is provided with a via 301 (e.g., Figure 4 As shown), the extension section 2231 passes through the via 301, and the welding section 2232 is connected to the end of the extension section 2231 away from the battery cell body 21. The welding section 2232 and the extension section 2231 are bent together, and the welding section 2232 is welded and fixed to the side of the busbar 31 away from the circuit board 3.

[0066] In this embodiment, two interconnected tabs 22 form a tab group. A connecting portion 223 is provided at the end of the tab group away from the battery cell 2. The two tabs 22 at the connecting portion 223 are fitted together to form an integral structure, facilitating connection to the busbar 31 via the connecting portion 223. Furthermore, the connecting portion 223 includes an extension section 2231 and a soldering section 2232. The extension section 2231 extends along the second direction Y and passes through a through-hole 301 in the circuit board 3. The soldering section 2232 is connected to the end of the extension section 2231 away from the battery cell body 21, and the soldering section 2232 is bent between the extension section 2231 and the extension section 2231. Thus, by soldering the soldering section 2232 of one tab group to the busbar 31 on the circuit board 3, the two tabs 22 can be connected and fixed to the busbar 31, making the operation simple and convenient and improving assembly efficiency.

[0067] In some embodiments, such as Figure 5 As shown, the soldering segments 2232 formed by all the tabs 22 are bent in the same direction. By making the soldering segments 2232 corresponding to all the tabs 22 bend in the same direction, the regularity of the arrangement of the soldering segments 2232 of the multiple tabs 22 is improved, which facilitates the layout of the connection structure between the soldering segments 2232 and the busbar 31 on the circuit board 3, and also facilitates the soldering operation of multiple tabs 22 and multiple busbars 31.

[0068] It should be noted that multiple battery cells 2 are connected in series and parallel. On the two outermost battery cells 2, there is a tab 22 that is individually electrically connected to the busbar 31 on the circuit board 3. The structure of the individually connected tab 22 can be set with reference to the tab 22 structure in the above-mentioned tab group, and will not be described again here.

[0069] Optionally, such as Figure 3 and Figure 4As shown, the battery pack also has a third direction Z that is perpendicular to the first direction X and the second direction Y respectively; the busbar 31 includes a main body 311 and a busbar 312. The main body 311 extends along the first direction X and is electrically connected to the circuit board 3. The busbar 312 is disposed on one side of the main body 311 along the third direction Z. One end of the busbar 312 is connected to the main body 311, and the other end of the busbar 312 extends along the third direction Z in a direction away from the main body 311. The welding section 2232 is welded and fixed to the busbar 312.

[0070] In this embodiment, the busbar 31 is configured to include a main body 311 and a busbar 312. The main body 311 extends along the first direction X and is electrically connected to the circuit board 3, thereby improving the connection stability between the busbar 31 and the circuit board 3. At the same time, the busbar 312 is provided on one side of the main body 311 along the third direction Z, so that the busbar 312 can be welded and fixed to the tab 22, thereby improving the connection strength of the busbar 31 tab 22. In addition, this structure of the busbar 31 also facilitates the layout of multiple busbars 31 on the circuit board 3.

[0071] It should be noted that the busbar 31 can have one or more busbar sections 312. When there is one busbar section 312, one busbar 31 connects to one tab or one group of tabs; when there are multiple busbar sections 312, one busbar 31 connects to multiple tabs or multiple groups of tabs. The number of busbar sections 312 in the busbar 31 can be flexibly set according to actual needs and is not limited here.

[0072] Optionally, such as Figure 3 and Figure 4 As shown, the busbar 31 is provided with a plurality of busbar sections 312. The plurality of busbar sections 312 are all located on one side of the main body 311 along the third direction Z, and the plurality of busbar sections 312 are arranged at intervals along the first direction X. The welding section 2232 of each connecting part 223 is welded and fixed to a busbar section 312.

[0073] In this embodiment, the busbar 31 is provided with a plurality of busbar sections 312, which are located on the same side of the main body 311 along the third direction Z. The plurality of busbar sections 312 are arranged at intervals along the first direction X. One busbar section 312 can be connected to one tab group or one tab 22. In this way, multiple tab groups or tabs 22 can be connected to one busbar 31 at the same time, which facilitates the flexible setting of the connection structure between the busbar 31 and the tabs 22 in actual application to meet different usage requirements.

[0074] Optionally, such as Figure 3 and Figure 4As shown, the circuit board 3 has a via 301 at a position corresponding to each busbar 312. The via 301 is located on one side of the busbar 312 along the first direction X. The extension 2231 of each connecting part 223 passes through a via 301, and the soldering part 2232 is soldered and fixed to the side of the busbar 312 away from the circuit board 3.

[0075] In this embodiment of the application, by providing a via 301 at each bus section 312 corresponding to the bus 31 in the circuit board 3, and placing the via 301 on one side of the bus section 312 along the first direction X, so that a tab 22 or a group of tabs passes through the corresponding via 301 and is soldered and fixed to a bus section 312, the connection structure between the tab 22 and the bus 31 on the circuit board 3 is more regular, thereby saving the space occupied by the connection structure on the circuit board 3 and facilitating the layout of other components on the circuit board 3.

[0076] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0077] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that, include: The battery pack comprises a housing (1), multiple battery cells (2), a busbar (31), and a circuit board (3); the battery pack has a first direction (X) and a second direction (Y) that are perpendicular to each other. The housing (1) is provided with a receiving cavity (11), and a plurality of the battery cells (2) are arranged at intervals in the receiving cavity (11) along the first direction (X). The circuit board (3) is disposed in the receiving cavity (11). The receiving cavity (11) is provided with an opening on one side along the second direction (Y). The circuit board (3) is disposed in the receiving cavity (11) and located on the side of the battery cells (2) facing the opening. A plurality of busbars (31) are provided on the side of the circuit board (3) away from the battery cells (2). The plurality of busbars (31) are electrically connected to the circuit board (3). The battery cell (2) includes a battery cell body (21) and a tab (22) disposed on one end of the battery cell body (21) facing the circuit board (3). The tabs (22) of two adjacent batteries (2) are at least partially attached to form a connection portion (223). The connection portion (223) passes through the circuit board (3) and is electrically connected to a busbar (31).

2. The battery pack according to claim 1, characterized in that, The tab (22) includes a first segment (221) and a second segment (222), the first segment (221) being connected to the battery cell body (21), and the second segment (222) being connected to the end of the first segment (221) away from the battery cell body (21); The two interconnected tabs (22) are a first sub-tab (22a) and a second sub-tab (22b), respectively. The second segment (222) of the first sub-tab (22a) and the second segment (222) of the second sub-tab (22b) are fitted together to form the connecting portion (223); there is a gap between the first segment (221) of the first sub-tab (22a) and the first segment (221) of the second sub-tab (22b).

3. The battery pack according to claim 2, characterized in that, The first segment (221) includes a vertical segment (2211) and a bent segment (2212). One end of the vertical segment (2211) is connected to the cell body (21), and the other end of the vertical segment (2211) extends away from the cell body (21) along the second direction (Y). The bent segment (2212) is connected to the other end of the vertical segment (2211), and the bent segment (2212) is bent relative to the vertical segment (2211). The second segment (222) is connected to the bent segment (2212).

4. The battery pack according to claim 3, characterized in that, The bent section (2212) and the vertical section (2211) are set at an obtuse angle; And / or, an arc transition section (2213) is provided between the vertical section (2211) and the bent section (2212).

5. The battery pack according to claim 3, characterized in that, The bent section (2212) of the first sub-taper (22a) and the bent section (2212) of the second sub-taper (22b) are bent toward each other.

6. The battery pack according to claim 3, characterized in that, The battery pack also has a third direction (Z), which is perpendicular to the first direction (X) and the second direction (Y); each cell (2) is provided with two tabs (22), which are positive tabs (22c) and negative tabs (22d), respectively. The positive tabs (22c) and the negative tabs (22d) are spaced apart along the third direction (Z), and the bending section (2212) of the positive tab (22c) and the bending section (2212) of the negative tab (22d) are bent in opposite directions.

7. The battery pack according to any one of claims 1-6, characterized in that, The connecting part (223) includes an extension section (2231) and a welding section (2232). The circuit board (3) has a through hole (301). The extension section (2231) passes through the through hole (301). The welding section (2232) is connected to the end of the extension section (2231) away from the battery cell body (21). The welding section (2232) is bent from the extension section (2231). The welding section (2232) is welded and fixed to the side of the busbar (31) away from the circuit board (3).

8. The battery pack according to claim 7, characterized in that, The battery pack also has a third direction (Z) perpendicular to the first direction (X) and the second direction (Y); the busbar (31) includes a main body (311) and a busbar (312), the main body (311) extends along the first direction (X) and is electrically connected to the circuit board (3), the busbar (312) is disposed on one side of the main body (311) along the third direction (Z), one end of the busbar (312) is connected to the main body (311), and the other end of the busbar (312) extends along the third direction (Z) in a direction away from the main body (311), and the welding section (2232) is welded and fixed to the busbar (312).

9. The battery pack according to claim 8, characterized in that, The busbar (31) is provided with a plurality of busbar sections (312), each of which is located on one side of the main body (311) along the third direction (Z), and the plurality of busbar sections (312) are arranged at intervals along the first direction (X). The welding section (2232) of each connecting part (223) is welded and fixed to one of the busbar sections (312).

10. The battery pack according to claim 9, characterized in that, The circuit board (3) is provided with a via (301) at a position corresponding to each of the busbars (312), and the via (301) is located on one side of the busbar (312) along the first direction (X); the extension (2231) of each of the connecting parts (223) passes through a via (301), and the welding section (2232) is welded and fixed to the side of the busbar (312) away from the circuit board (3).

11. The battery pack according to claim 7, characterized in that, All of the electrode tabs (22) forming the welded segments (2232) are bent in the same direction.

12. The battery pack according to claim 1, characterized in that, The battery pack also includes a BMS component (32), which is disposed on the circuit board (3) and electrically connected to the circuit board (3); and / or, the battery cell (2) is a pouch cell.

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