Battery module and battery pack

Abstract

The utility model provides a kind of battery module and battery pack, battery module includes: shell;Mutually independent first electric core unit and second electric core unit, first electric core unit and second electric core unit are all arranged in shell, first electric core unit has one first positive terminal and one first negative terminal, second electric core unit has one second positive terminal and one second negative terminal, part first positive terminal, part first negative terminal, part second positive terminal and part second negative terminal are all located at the outside of shell;First positive terminal and first negative terminal are located at the different side of shell, first positive terminal and second negative terminal are located at the same side of shell, second positive terminal and first negative terminal are located at the same side of shell. By the scheme, the problem that if want to increase electric quantity, need to redesign target electric quantity battery pack or multiple low electric quantity battery pack is connected in series in relevant technology can be solved Higher R&D cost problem.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically, to a battery module and a battery pack. Background Technology

[0002] Typically, when designing a battery pack, researchers need to pre-determine the number of cells and their connection method. Once the number of cells and the connection method are confirmed, the performance parameters of the battery pack are fixed. If the capacity is to be increased, the battery pack with the target capacity needs to be redesigned, or multiple low-capacity battery packs need to be connected in series. However, both of these methods have high research and development costs. Utility Model Content

[0003] The main objective of this invention is to provide a battery module and battery pack to solve the problem that in related technologies, if you want to increase the power capacity, you need to redesign the battery pack with the target power capacity or connect multiple low-power battery packs in series, which results in high research and development costs.

[0004] To achieve the above objectives, this utility model provides a battery module, which includes: a housing; and two independent first and second battery cells, both disposed within the housing. The first battery cell has a first positive terminal and a first negative terminal, and the second battery cell has a second positive terminal and a second negative terminal. A portion of the first positive terminal, a portion of the first negative terminal, a portion of the second positive terminal, and a portion of the second negative terminal are located on the outside of the housing. The first positive terminal and the first negative terminal are located on different sides of the housing, and the first positive terminal and the second negative terminal are located on the same side of the housing. The second positive terminal and the first negative terminal are also located on the same side of the housing.

[0005] Furthermore, a first snap-fit ​​structure is provided on the first positive terminal, a second snap-fit ​​structure is provided on the first negative terminal, a third snap-fit ​​structure is provided on the second positive terminal, and a fourth snap-fit ​​structure is provided on the second negative terminal; wherein, the first snap-fit ​​structure can snap-fit ​​with the second snap-fit ​​structure of other battery modules; and the third snap-fit ​​structure can snap-fit ​​with the fourth snap-fit ​​structure of other battery modules.

[0006] Furthermore, the first positive terminal and the first negative terminal are located on the first and second sides of the housing, respectively, which are opposite to each other.

[0007] Furthermore, both the first battery cell unit and the second battery cell unit extend along the direction from the first side to the second side of the housing, and the first battery cell unit and the second battery cell unit are distributed along the direction perpendicular to the first side to the second side of the housing; and / or, the first battery cell unit includes a plurality of first battery cells, and the plurality of first battery cells are arranged side by side along the direction from the first side to the second side of the housing; the second battery cell unit includes a plurality of second battery cells, and the plurality of second battery cells are arranged side by side along the direction from the first side to the second side of the housing.

[0008] Furthermore, the first positive terminal and the first negative terminal are located on opposite sides of the outer casing.

[0009] Another aspect of this utility model provides a battery pack, which includes a plurality of the above-mentioned battery modules. The first cell units of the plurality of battery modules are connected in series to form a first battery string, and the second cell units of the plurality of battery modules are connected in series to form a second battery string. The first positive terminal of the first battery module of the first battery string is connected to the second negative terminal of the first battery module of the second battery string, or the first negative terminal of the last battery module of the first battery string is connected to the second positive terminal of the last battery module of the second battery string.

[0010] Furthermore, the battery pack also includes: a connector, the two ends of which can be connected to the first positive terminal of the first battery module of the first battery string and the second negative terminal of the first battery module of the second battery string, respectively; the two ends of the connector can be connected to the first negative terminal of the last battery module of the first battery string and the second positive terminal of the last battery module of the second battery string, respectively.

[0011] Furthermore, the two ends of the connector are respectively engaged with the first positive terminal of the first battery module of the first battery string and the second negative terminal of the first battery module of the second battery string; or, the two ends of the connector are respectively engaged with the first negative terminal of the last battery module of the first battery string and the second positive terminal of the last battery module of the second battery string.

[0012] Furthermore, the battery pack also includes: a housing; multiple battery modules disposed within the housing; and a BMS module disposed within the housing, the BMS module being electrically connected to at least one battery module.

[0013] Furthermore, the first cell unit of the battery module includes a plurality of interconnected first cells, and the second cell unit of the battery module includes a plurality of interconnected second cells. The number of first cells in the first cell units of at least two battery modules is different, and the number of second cells in the second cell units of at least two battery modules is different.

[0014] By applying the technical solution of this utility model, when the user's power demand increases, multiple battery modules can be connected within a single battery pack according to the user's actual needs. These multiple battery modules are then connected to other components of the battery pack, such as the BMS module. This configuration increases the flexibility of the battery pack's power design, shortens the development cycle, and reduces development costs. Specifically, during battery pack assembly, an appropriate number of battery modules are selected based on the target design capacity of the battery pack. Multiple battery modules are arranged in predetermined positions, and the first positive and negative terminals of adjacent battery modules are connected. Similarly, the second positive and second negative terminals of adjacent battery modules are connected. Then, the first positive and second negative terminals of the battery module at the beginning are connected, with the first negative terminal of the battery module at the end serving as the output negative terminal of the battery pack, and the second positive terminal of the battery module at the end serving as the output positive terminal of the battery pack. Alternatively, the first positive and second negative terminals of the battery module at the end are connected, with the first negative terminal of the battery module at the beginning serving as the output negative terminal of the battery pack, and the second positive terminal of the battery module at the beginning serving as the output positive terminal of the battery pack. This configuration allows for adjustment of the battery pack's capacity parameters by connecting different numbers of battery modules, standardizing the battery pack design, facilitating the design of battery packs with different target capacities, shortening the development cycle for battery packs with different capacities, and reducing development costs. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0016] Figure 1 A schematic diagram of the structure of a battery module according to an embodiment of the present invention is shown;

[0017] Figure 2 A partial structural schematic diagram of a battery module provided according to an embodiment of the present utility model is shown;

[0018] Figure 3 A schematic diagram of the connector and multiple battery modules provided according to an embodiment of the present invention is shown;

[0019] Figure 4 A schematic diagram showing the connection between the first and second cell units in the battery module at the end of the battery pack and the connector is shown.

[0020] The above figures include the following reference numerals:

[0021] 10. Outer shell; 101. First side; 102. Second side;

[0022] 20. First cell unit; 21. First positive terminal; 22. First negative terminal;

[0023] 30. Second cell unit; 31. Second positive terminal; 32. Second negative terminal;

[0024] 40. Connectors. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0026] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0027] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0028] like Figure 1 and Figure 2As shown, this utility model embodiment provides a battery module, which includes a housing 10 and mutually independent first cell unit 20 and second cell unit 30. The first cell unit 20 and the second cell unit 30 are both disposed inside the housing 10. The first cell unit 20 has a first positive terminal 21 and a first negative terminal 22, and the second cell unit 30 has a second positive terminal 31 and a second negative terminal 32. Parts of the first positive terminal 21, part of the first negative terminal 22, part of the second positive terminal 31 and part of the second negative terminal 32 are located on the outside of the housing 10. The first positive terminal 21 and the first negative terminal 22 are located on different sides of the housing 10, and the first positive terminal 21 and the second negative terminal 32 are located on the same side of the housing 10.

[0029] By applying the technical solution of this utility model, when the user's power demand increases, multiple battery modules can be connected within a single battery pack according to the user's actual needs. These multiple battery modules are then connected to other components of the battery pack, such as the BMS module. This configuration increases the flexibility of the battery pack's power design, shortens the development cycle, and reduces development costs. Specifically, when assembling the battery pack, an appropriate number of battery modules are selected according to the target design capacity of the battery pack. Multiple battery modules are arranged in a predetermined position, and the first positive terminal 21 and the first negative terminal 22 of two adjacent battery modules are connected. The second positive terminal 31 and the second negative terminal 32 of two adjacent battery modules are also connected. Then, the first positive terminal 21 and the second negative terminal 32 of the battery module at the beginning are connected, and the first negative terminal 22 of the battery module at the end is used as the output negative terminal of the battery pack, and the second positive terminal 31 of the battery module at the end is used as the output positive terminal of the battery pack. Alternatively, the first positive terminal 21 and the second negative terminal 32 of the battery module at the end are connected, and the first negative terminal 22 of the battery module at the beginning is used as the output negative terminal of the battery pack, and the second positive terminal 31 of the battery module at the beginning is used as the output positive terminal of the battery pack. This configuration allows for the adjustment of the battery pack's power parameters by connecting different numbers of battery modules, thus standardizing the battery pack design. This facilitates the design of battery packs with different target power levels, shortens the development cycle for battery packs with different power levels, and reduces development costs.

[0030] It is understood that in this solution, the first cell unit 20 and the second cell unit 30 in the same battery module may have the same amount of power or different amounts of power.

[0031] As an example, the battery modules can be designed as standard modules such as 1P10S, 1P12S, 1P14S, 1P16S, and 1P18S. When in use, they can be combined according to the power requirements of the battery pack. For example, if the target battery pack is 1P48S, three 1P16S battery modules can be spliced ​​together; or, if the target battery pack is 1P52S, four battery modules of 1P10S, 1P12S, 1P14S, and 1P16S can be spliced ​​together.

[0032] This solution does not limit the connection method of the first positive terminal 21 and the first negative terminal 22 of two adjacent battery modules, nor does it limit the connection method of the second positive terminal 31 and the second negative terminal 32 of two adjacent battery modules.

[0033] In this embodiment, a first snap-fit ​​structure is provided on the first positive terminal 21, a second snap-fit ​​structure is provided on the first negative terminal 22, a third snap-fit ​​structure is provided on the second positive terminal 31, and a fourth snap-fit ​​structure is provided on the second negative terminal 32. The first snap-fit ​​structure can snap into the second snap-fit ​​structure of other battery modules; the third snap-fit ​​structure can snap into the fourth snap-fit ​​structure of other battery modules. This configuration enables rapid connection between battery modules, significantly reducing assembly time and improving production efficiency. During maintenance or upgrades, the snap-fit ​​structure allows for easy disassembly and reconnection of battery modules, reducing maintenance difficulty and cost. Furthermore, the snap-fit ​​structure provides stable mechanical contact, enhancing the reliability of electrical connections and avoiding poor contact problems caused by long-term vibration or temperature changes. In addition, the snap-fit ​​structure allows for connection between corresponding terminals within a smaller physical space, eliminating the need for additional guides and connectors, reducing the complexity and space required for internal wiring, and enabling stacking of battery modules. This not only simplifies the internal structure of the battery pack but also reduces the error rate during assembly and improves production efficiency.

[0034] In this design, the outer shell 10 is a cubic shell structure. This design does not limit the specific relative positions of the first positive terminal 21 and the first negative terminal 22, as long as they are not located on the same side of the outer shell 10.

[0035] The above configuration allows battery modules with the same housing 10 structure to be connected within the same battery pack, or battery modules with different housing 10 structures to be connected.

[0036] It is understandable that battery modules with the same housing 10 have the same relative positions of the first positive terminal 21 and the first negative terminal 22; battery modules with different housing 10 have different relative positions of the first positive terminal 21 and the first negative terminal 22.

[0037] In some embodiments of this solution, the first positive terminal 21 and the first negative terminal 22 are located on the first side 101 and the second side 102 of the housing 10, respectively, which are opposite to each other. When multiple battery modules with the same housing 10 structure are spliced ​​together, the multiple battery modules are arranged in a straight line.

[0038] Furthermore, both the first battery cell unit 20 and the second battery cell unit 30 extend along the direction from the first side 101 to the second side 102 of the outer casing 10, and are distributed along a direction perpendicular to the first side 101 to the second side 102 of the outer casing 10. This arrangement improves the rationality of the layout of the first battery cell unit 20 and the second battery cell unit 30 within the outer casing 10, and optimizes the space utilization rate of the first battery cell unit 20 and the second battery cell unit 30 within the outer casing 10.

[0039] In some embodiments of this solution, the first positive terminal 21 is located at one end of the first cell unit 20 near the first side 101 of the outer casing 10, and the first negative terminal 22 is located at one end of the first cell unit 20 near the second side 102 of the outer casing 10; the second positive terminal 31 is located at one end of the second cell unit 30 near the second side 102 of the outer casing 10, and the second negative terminal 32 is located at one end of the second cell unit 30 near the first side 101 of the outer casing 10.

[0040] In this embodiment, the first battery cell unit 20 includes multiple first battery cells arranged side-by-side along the direction from the first side 101 to the second side 102 of the outer casing 10; the second battery cell unit 30 includes multiple second battery cells arranged side-by-side along the direction from the first side 101 to the second side 102 of the outer casing 10. This arrangement allows the first battery cell unit 20 and the second battery cell unit 30 to fully utilize the space inside the outer casing 10, enabling a tight arrangement of the first and second battery cells within the outer casing 10, resulting in a more compact battery module design and a smaller size.

[0041] In the first cell unit 20, two adjacent first cells can be welded together by aluminum busbars. The whole of multiple first cells connected together has a first positive terminal 21 and a first negative terminal 22. Similarly, in the second cell unit 30, two adjacent second cells can be welded together by aluminum busbars. The whole of multiple second cells connected together has a second positive terminal 31 and a second negative terminal 32.

[0042] In other embodiments of this solution, the first positive terminal 21 and the first negative terminal 22 are respectively located on two adjacent sides of the housing 10. It is understood that the housing 10 has a first side 101 and a second side 102 arranged opposite each other along its length. The housing 10 also has four sides located between the first side 101 and the second side 102, namely a first side, a second side, a third side, and a fourth side. The first positive terminal 21 and the second negative terminal 32 can be disposed on the first side of the housing 10, and the first negative terminal 22 and the second positive terminal 31 can be disposed on one of the four sides simultaneously, for example, the first negative terminal 22 and the second positive terminal 31 can be disposed on the first side simultaneously.

[0043] like Figure 3 and Figure 4 As shown, another aspect of this utility model also provides a battery pack, which includes a plurality of the above-mentioned battery modules. The first cell units 20 of the plurality of battery modules are connected in series to form a first battery string, and the second cell units 30 of the plurality of battery modules are connected in series to form a second battery string. The first positive terminal 21 of the first battery module at the beginning of the first battery string and the second negative terminal 32 of the first battery module at the beginning of the second battery string are connected, or the first negative terminal 22 of the first battery module at the end of the first battery string and the second positive terminal 31 of the second battery module at the end of the second battery string are connected.

[0044] Multiple battery modules' first cell units 20 are connected sequentially to form a first battery string, and multiple battery modules' second cell units 30 are connected sequentially to form a second battery string. This arrangement makes the energy storage and current path within the battery pack clearer, facilitating management and control by staff. Furthermore, during battery pack packaging, the first positive terminal 21 of the first battery module and the second negative terminal 32 of the second battery module at the beginning of the first battery string are not connected, nor are the first negative terminal 22 of the first battery module and the second positive terminal 31 of the second battery module at the end of the first battery string connected. When needed, the first positive terminal 21 of the first battery module and the second negative terminal 32 of the second battery module at the beginning of the first battery string are connected to form a closed loop, or the first negative terminal 22 of the first battery module and the second positive terminal 31 of the second battery module at the end of the first battery string are connected to form a closed loop.

[0045] In this design, the battery pack also includes a connector 40. The two ends of the connector 40 are connected to the first positive terminal 21 of the first battery module in the first battery string and the second negative terminal 32 of the first battery module in the second battery string, respectively; or, the two ends of the connector 40 are connected to the first negative terminal 22 of the last battery module in the first battery string and the second positive terminal 31 of the last battery module in the second battery string, respectively. The connector 40 acts as an electrical bridge between the first and second battery strings. It can directly connect the first positive terminal 21 of the first module in the first battery string to the second negative terminal 32 of the first module in the second battery string, or connect the first negative terminal 22 of the last module in the first battery string to the second positive terminal 31 of the last module in the second battery string. The design of the connector 40 makes the battery pack easy to modularly expand. When it is necessary to increase the battery pack's capacity, simply add or replace the corresponding battery module and then use the connector 40 for electrical connection.

[0046] Understandably, when the two ends of the connector 40 are connected to the first positive terminal 21 of the first battery module of the first battery string and the second negative terminal 32 of the first battery module of the second battery string, the first negative terminal 22 of the last battery module of the first battery string serves as the negative output terminal of the battery pack, and the second positive terminal 31 of the last battery module of the second battery string serves as the positive output terminal of the battery pack. Similarly, when the two ends of the connector 40 are connected to the first negative terminal 22 of the last battery module of the first battery string and the second positive terminal 31 of the last battery module of the second battery string, the first positive terminal 21 of the first battery module of the first battery string serves as the positive output terminal of the battery pack, and the second negative terminal 32 of the first battery module of the second battery string serves as the negative output terminal of the battery pack.

[0047] Specifically, the two ends of the connector 40 can be respectively engaged with the first positive terminal 21 of the first battery module of the first battery string and the second negative terminal 32 of the first battery module of the second battery string; the two ends of the connector 40 can also be respectively engaged with the first negative terminal 22 of the last battery module of the first battery string and the second positive terminal 31 of the last battery module of the second battery string. This configuration allows the two ends of the connector 40 to be engaged with the corresponding terminals according to usage requirements, simplifying the assembly and disassembly of the battery pack and saving time and manpower.

[0048] Furthermore, the battery pack also includes a housing and a BMS module; multiple battery modules are housed within the housing; the BMS module is also housed within the housing and is electrically connected to at least one battery module. The housing houses and secures the BMS module and the multiple battery modules, providing physical protection to prevent them from being affected by external environmental factors. The BMS module monitors and manages the status of the battery modules within the battery pack, ensuring the safety and efficiency of the battery pack during operation.

[0049] In this embodiment of the solution, the BMS module is connected to each battery module. This configuration allows the BMS module to monitor the operating status of all battery modules, facilitating the monitoring and diagnosis of the battery pack.

[0050] In some embodiments of this solution, multiple battery modules have the same model number.

[0051] In other embodiments of this solution, multiple battery modules with different capacities or different housing forms can be selected as needed.

[0052] For example, in some embodiments of this solution, the first cell unit 20 of the battery module includes a plurality of interconnected first cells, and the second cell unit 30 of the battery module includes a plurality of interconnected second cells. The number of first cells in the first cell units 20 of at least two battery modules is different, and the number of second cells in the second cell units 30 of at least two battery modules is different.

[0053] Alternatively, in some other embodiments of this solution, in the battery modules of the battery pack, the first positive terminal 21 and the second negative terminal 32 of some battery modules are both located on the first side 101 of the outer casing 10, and the first negative terminal 22 and the second positive terminal 31 are both located on the second side 102 of the outer casing 10; while in other battery modules, the first positive terminal 21 and the second negative terminal 32 are both located on the first side 101 of the outer casing 10, and the first negative terminal 22 and the second positive terminal 31 are both located on the third side of the outer casing 10. The first side 101 and the second side 102 of the outer casing 10 are arranged opposite to each other, and the first side 101 and the third side of the outer casing 10 are arranged adjacent to each other.

[0054] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0055] 1. This solution adopts a modular design for battery modules. When designing battery packs with different capacities, multiple compatible battery modules can be connected, which shortens the battery pack design cycle, reduces R&D costs, and improves the flexibility of product design and production.

[0056] 2. The first positive terminal 21 and the first negative terminal 22 on the battery module are located on different sides of the housing 10, the second negative terminal 32 and the first positive terminal 21 are located on the same side of the housing 10, and the first negative terminal 22 and the second positive terminal 31 are located on the same side of the housing 10. This arrangement facilitates the connection of two adjacent battery modules.

[0057] 3. The first snap-fit ​​structure on the first positive terminal 21 and the second snap-fit ​​structure on the first negative terminal 22 of the two adjacent battery modules snap-fit ​​each other, and the third snap-fit ​​structure on the second positive terminal 31 and the fourth snap-fit ​​structure on the second negative terminal 32 of the two adjacent battery modules snap-fit ​​each other, which improves the convenience of connecting the two adjacent battery modules, and eliminates the need for connecting wire harnesses and connectors, saving the space occupied inside the housing 10.

[0058] 4. Connector 40 serves as a bridge between the first and second battery strings, facilitating modular expansion of the battery pack. When increasing the battery pack's capacity is required, simply add or replace the corresponding battery modules and connect them using connector 40. Furthermore, the snap-fit ​​design of connector 40 simplifies the battery pack assembly and disassembly process, enabling rapid formation of a closed circuit during use.

[0059] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms 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 on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0060] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0061] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0062] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A battery module, characterized in that, The battery module includes: Outer shell (10); The first battery cell unit (20) and the second battery cell unit (30) are independent of each other. The first battery cell unit (20) and the second battery cell unit (30) are both disposed inside the housing (10). The first battery cell unit (20) has a first positive terminal (21) and a first negative terminal (22). The second battery cell unit (30) has a second positive terminal (31) and a second negative terminal (32). Part of the first positive terminal (21), part of the first negative terminal (22), part of the second positive terminal (31) and part of the second negative terminal (32) are all located on the outside of the housing (10). The first positive terminal (21) and the first negative terminal (22) are located on different sides of the housing (10). The first positive terminal (21) and the second negative terminal (32) are located on the same side of the housing (10). The second positive terminal (31) and the first negative terminal (22) are located on the same side of the housing (10).

2. The battery module according to claim 1, characterized in that, The first positive terminal (21) is provided with a first snap-fit ​​structure, the first negative terminal (22) is provided with a second snap-fit ​​structure, the second positive terminal (31) is provided with a third snap-fit ​​structure, and the second negative terminal (32) is provided with a fourth snap-fit ​​structure. The first snap-fit ​​structure can snap into the second snap-fit ​​structure of other battery modules; the third snap-fit ​​structure can snap into the fourth snap-fit ​​structure of other battery modules.

3. The battery module according to claim 1, characterized in that, The first positive terminal (21) and the first negative terminal (22) are located on the first side (101) and the second side (102) of the outer casing (10), respectively, which are oppositely arranged.

4. The battery module according to claim 3, characterized in that, The first battery cell (20) and the second battery cell (30) both extend along a direction from a first side (101) to a second side (102) of the outer casing (10), and the first battery cell (20) and the second battery cell (30) are distributed along a direction perpendicular to the first side (101) to the second side (102) of the outer casing (10); and / or, The first battery cell unit (20) includes a plurality of first battery cells, which are arranged side by side along the direction from the first side (101) to the second side (102) of the outer casing (10); the second battery cell unit (30) includes a plurality of second battery cells, which are arranged side by side along the direction from the first side (101) to the second side (102) of the outer casing (10).

5. The battery module according to claim 1, characterized in that, The first positive terminal (21) and the first negative terminal (22) are located on opposite sides of the outer casing (10).

6. A battery pack, characterized in that, The battery pack includes: Multiple battery modules, wherein the battery modules are any one of the battery modules described in claims 1 to 5, wherein the first cell units (20) of the multiple battery modules are connected in series to form a first battery string, and the second cell units (30) of the multiple battery modules are connected in series to form a second battery string; The first positive terminal (21) of the first battery module of the first battery string is connected to the second negative terminal (32) of the first battery module of the second battery string, or the first negative terminal (22) of the last battery module of the first battery string is connected to the second positive terminal (31) of the last battery module of the second battery string.

7. The battery pack according to claim 6, characterized in that, The battery pack also includes: A connector (40) is provided, with its two ends connected to the first positive terminal (21) of the first battery module of the first battery string and the second negative terminal (32) of the first battery module of the second battery string, respectively; or, The two ends of the connector (40) are respectively connected to the first negative terminal (22) of the end battery module of the first battery string and the second positive terminal (31) of the end battery module of the second battery string.

8. The battery pack according to claim 7, characterized in that, The two ends of the connector (40) can be engaged with the first positive terminal (21) of the first battery module of the first battery string and the second negative terminal (32) of the first battery module of the second battery string, respectively. The two ends of the connector (40) can be engaged with the first negative terminal (22) of the end battery module of the first battery string and the second positive terminal (31) of the end battery module of the second battery string, respectively.

9. The battery pack according to claim 6, characterized in that, The battery pack also includes: Housing; all of the battery modules are disposed within the housing; A BMS module is disposed within the housing, and the BMS module is electrically connected to at least one of the battery modules.

10. The battery pack according to claim 6, characterized in that, The first cell unit (20) of the battery module includes a plurality of interconnected first cells, and the second cell unit (30) of the battery module includes a plurality of interconnected second cells. The number of first cells in at least two of the first cell units (20) of the battery module is different, and the number of second cells in at least two of the second cell units (30) of the battery module is different.

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