Plug-in type cylindrical battery, battery module and battery pack

Abstract

The invention discloses a plug-in type cylindrical battery, a battery module and a battery pack, the negative electrode end of a battery body is provided with a pole insertion rod, the positive electrode end of the battery body is provided with an insertion block, the insertion block is provided with an insertion hole, when a plurality of cylindrical batteries are connected in series and in parallel, two cylindrical batteries are arranged up and down, the adjacent pole insertion rods are inserted into the insertion holes, and the two cylindrical batteries are connected in series; and parallel connection sheets are sleeved on the pole insertion rods, the insertion blocks press the parallel connection sheets on the negative electrode sides of the cylindrical batteries, and the parallel connection sheets connect two adjacent groups of cylindrical batteries which are arranged up and down in parallel. The cylindrical battery has the beneficial effects that the structure of the cylindrical battery is optimized, plug-in series connection is realized, parallel connection is realized by pressing the parallel connection pieces at the negative electrode end through the plug blocks, and tight connection of the parallel connection pieces is realized. The single-layer cylindrical batteries are fixed through the positive and negative electrode supports, effective insertion and tight insertion of the cylindrical batteries are further ensured, the positive and negative electrode supports are clamped through the support buckles and the support clamping grooves, the connection tightness of the parallel connection pieces is further improved, and the safety and stability of the battery module are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cylindrical batteries, and in particular to a plug-in cylindrical battery, a battery module and a battery pack. Background Art

[0002] Cylindrical batteries are becoming increasingly popular in the power and energy storage sectors due to their unique flexibility. When used as a set, multiple batteries are typically connected in series or parallel to create a complete battery pack.

[0003] When the battery is connected in series and parallel, it is necessary to tightly connect the current-carrying sheet to the positive and negative electrodes of the battery and the smaller the connection resistance, the better. Moreover, when the battery is running after the series and parallel connection, current will flow through the current-carrying sheet. The current-carrying sheet needs to be tightly connected to the battery to ensure that the current flows smoothly and reduce heat generation. If the current-carrying sheet moves relative to the battery during battery operation, the current-carrying sheet connection is not tight, resulting in loose connections between the batteries. When a large current passes through, it will overheat, increase the heat generation, and affect the voltage acquisition accuracy. Moreover, if the current-carrying sheet connection is loose, the positive and negative electrodes are not properly plugged in, and the contact area is insufficient, which will lead to the inability to pass a large current. Even when the current is too large, it causes abnormal heating. Overheating may even cause thermal runaway of the battery, resulting in accidents such as fire. Therefore, the current series and parallel connection method is to weld the aluminum sheet current-carrying sheet to the battery, and the current-carrying sheet is firmly connected to the battery by welding. However, problems such as cold welding and leaking welding are easily generated during welding, affecting the safety and stability of the battery pack. Moreover, the welding method has a long processing cycle and high welding process requirements. In addition, the welding method is not convenient for battery replacement and maintenance. Failure of one or several single cells may cause the entire battery pack to be unusable, increasing the cost of using the battery pack. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a plug-in cylindrical battery, battery module and battery pack, optimize the structure of the cylindrical battery, realize the plug-in series connection of the cylindrical battery, press the parallel plate against the negative end of the cylindrical battery through the plug block, realize the parallel connection of the cylindrical batteries, and realize the tight connection of the parallel plates. The single-layer cylindrical battery is fixed by the positive and negative brackets, further ensuring the effective plug-in and tight plug-in of the upper and lower layers of cylindrical batteries. The upper and lower layers of cylindrical batteries are clamped together by the bracket buckle and bracket slot, further improving the connection tightness of the parallel plate and improving the safety and stability of the battery module.

[0005] The objective of the present invention is achieved through the following technical measures: a plug-in cylindrical battery, comprising a battery body, wherein the two ends of the battery body are respectively a positive terminal and a negative terminal, the negative terminal is provided with a pole plug rod, the positive terminal is provided with a plug block, and the plug block is provided with a socket. When multiple cylindrical batteries are connected in series and parallel, two cylindrical batteries are arranged up and down, adjacent pole plug rods are inserted into the sockets of the plug block, and the two cylindrical batteries are connected in series, and a parallel piece is mounted on the pole plug rod. The plug block presses the parallel piece against the negative pole side of the cylindrical battery, and the parallel piece connects the two adjacent groups of cylindrical batteries arranged up and down in parallel.

[0006] In some embodiments, a clamping block protrusion is provided on the side wall of the pole plug rod, and a clamping slot is provided on the side wall of the socket, and the clamping block protrusion cooperates with the clamping slot.

[0007] A battery module includes the cylindrical batteries described above, and the cylindrical batteries form at least two battery columns connected in parallel through parallel plates, each battery column includes at least two cylindrical batteries plugged in up and down, and each cylindrical battery is correspondingly provided with a positive electrode bracket and a negative electrode bracket, and the side walls of the positive electrode bracket and the negative electrode bracket are provided with splicing blocks and / or splicing slots.

[0008] In some embodiments, the negative electrode bracket includes a negative electrode bracket body, a negative terminal accommodating groove is provided at the bottom of the negative electrode bracket body, a pole through-hole is provided at the top of the negative electrode bracket body, a bracket buckle is provided on the circumferential side of the pole through-hole, and a buckle notch is provided on the bracket buckle, and the buckle notch is used to pass the parallel plate; the positive electrode bracket includes a positive electrode bracket body, a hollow channel is provided on the positive electrode bracket body that passes through the top and bottom of the bracket body, a partition is provided in the hollow channel, an insert through-hole is provided on the partition, and the partition separates the hollow channel into a positive terminal accommodating groove at the top and a buckle accommodating groove at the bottom, and a bracket clip slot is provided on the side wall of the clip accommodating groove, and the bracket clip slot is used in conjunction with the bracket clip.

[0009] In some embodiments, the positive electrode bracket body is further provided with a parallel plate notch on the side wall of the buckle receiving groove, and the parallel plate notch and the buckle notch together form a parallel plate channel.

[0010] In some embodiments, the parallel piece includes a plurality of connecting pieces, each of which is provided with parallel holes. The plurality of connecting pieces are connected by connecting strips, and each connecting piece is connected to at least two connecting strips.

[0011] In some embodiments, a sampling piece is connected to at least one connecting piece.

[0012] In some embodiments, two adjacent battery columns are arranged side by side or staggered.

[0013] A battery pack includes a shell, which accommodates a battery pack. The shell is provided with a connector, and the positive and negative poles of the battery pack are both connected to the connector. The battery pack includes at least one battery module, and the two ends of the battery module are respectively connected to a total positive connecting plate and a total negative connecting plate. When there are multiple battery modules, the multiple battery modules are connected in series.

[0014] In some embodiments, a BMS device is further included. The BMS device is disposed in the housing, and the total positive connecting piece and the total negative connecting piece of each battery module are connected to the BMS device.

[0015] Compared with the prior art, the present invention has the following advantages: the present invention provides a plug-in cylindrical battery, battery module, and battery pack. By changing the structure of the negative and positive terminals of the cylindrical battery, the cylindrical batteries can be plugged in and connected in series. The positive terminal plug-in block presses the parallel plate against the negative terminal of the cylindrical battery to achieve parallel connection of the cylindrical batteries, ultimately achieving series and parallel connection of the battery module. The present invention changes the traditional series and parallel welding method and adopts a mechanical connection method to achieve series and parallel connection of cylindrical batteries. The battery module can be quickly assembled and replaced, simplifying the process flow and reducing the cost of use. The parallel plate is tightly connected by the arrangement of the plug-in block and the terminal plug-in rod. The plug-in block and the terminal plug-in rod are plugged in to achieve contact connection between the side of the terminal plug-in rod and the side of the inner wall of the socket, ensuring the positive and negative contact area to facilitate the flow of large current. In addition, the present invention provides a splicable positive and negative bracket at both ends of the cylindrical battery. The splicing of the positive and negative brackets can fix the single-layer cylindrical battery, further ensuring the effective and tight plug-in connection of the upper and lower layers of cylindrical batteries. In addition, the present invention also provides a bracket buckle on the negative pole bracket and a bracket slot on the positive pole bracket. The upper and lower layers of cylindrical batteries are connected by the bracket buckle and the bracket slot, so that the positive pole bracket and the negative pole bracket clamp the parallel plate, further improving the connection tightness of the parallel plate, preventing the parallel plate from moving, and improving the safety and stability of the battery module.

[0016] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of a plug-in cylindrical battery.

[0018] Figure 2 It is a schematic diagram of the assembly structure of two cylindrical batteries and parallel pieces.

[0019] Figure 3 This is a schematic diagram of the battery module structure Figure 1 .

[0020] Figure 4 This is a schematic diagram of the battery module structure Figure 2 .

[0021] Figure 5 This is the structural diagram of the negative electrode bracket Figure 1 .

[0022] Figure 6 This is a schematic diagram of the structure of the positive electrode bracket Figure 1 .

[0023] Figure 7 It is a structural diagram of the connection between the positive pole bracket and the negative pole bracket.

[0024] Figure 8 This is a schematic diagram of the battery module structure Figure 3 .

[0025] Figure 9 This is the structural diagram of the negative electrode bracket Figure 2 .

[0026] Figure 10 This is a schematic diagram of the structure of the positive electrode bracket Figure 2 .

[0027] Figure 11 This is a schematic diagram of the parallel plate structure Figure 1 .

[0028] Figure 12 This is a schematic diagram of the parallel plate structure Figure 2 .

[0029] Figure 13 It is a structural diagram of the total positive connecting piece.

[0030] Figure 14 It is a structural diagram of the total negative connecting piece.

[0031] Figure 15 It is a structural diagram of the battery pack.

[0032] Among them, 1. Battery body, 2. Terminal plug rod, 3. Insert block, 4. Card block protrusion, 5. Parallel piece, 6. Negative bracket, 7. Positive bracket, 8. Terminal through hole, 9. Bracket buckle, 10. Buckle notch, 11. Splicing card block, 12. Splicing card slot, 13. Positive terminal accommodating slot, 14. Bracket slot, 15. Buckle accommodating slot, 16. Parallel piece notch, 17. Parallel hole, 18. Connecting strip, 19. Sampling piece, 20. Total positive connecting piece, 21. Total negative connecting piece, 22. Shell, 23. Connector, 24. BMS device. DETAILED DESCRIPTION

[0033] like Figures 1 to 15As shown, a plug-in cylindrical battery includes a battery body 1, wherein the two ends of the battery body 1 are respectively a positive terminal and a negative terminal, the negative terminal is provided with a pole plug rod 2, the positive terminal is provided with an insert block 3, and the insert block 3 is provided with a socket. When multiple cylindrical batteries are connected in series and parallel, two cylindrical batteries are arranged up and down, and adjacent pole plug rods 2 are inserted into the sockets of the insert block 3 to connect the two cylindrical batteries in series. A parallel piece 5 is installed on the pole plug rod 2, and the insert block 3 presses the parallel piece 5 against the negative side of the cylindrical battery. The two adjacent groups of cylindrical batteries arranged up and down are connected in parallel through the parallel piece 5. When the pole plug 2 is inserted into the socket, the side wall of the negative pole plug 2 contacts the inner wall of the socket of the positive plug block 3, and the cylindrical batteries arranged above and below are connected in series. The positive and negative poles are connected through the side, the flow area is increased, and the parallel connection of two adjacent columns of batteries is achieved through the parallel piece 5. The parallel piece 5 is pressed by the plug block 3, changing the traditional series-parallel welding method. The present invention realizes the series-parallel connection of cylindrical batteries through mechanical connection and realizes the tight connection of the parallel piece 5.

[0034] In some embodiments, the sidewalls of the pole rod 2 are provided with a latching protrusion 4, and the sidewalls of the socket are provided with a latching groove. The latching protrusion 4 cooperates with the latching groove. Specifically, when the pole rod 2 is inserted into the socket, the latching protrusion 4 engages within the latching groove. Further preferably, the latching protrusion 4 is an annular protrusion, and the latching groove is an annular latching groove. The provision of the latching protrusion 4 and the latching groove enhances the connection stability between the pole rod 2 and the socket, further ensuring the tightness of the connection of the parallel piece 5.

[0035] A battery module includes the cylindrical batteries described above, wherein the cylindrical batteries are formed into at least two battery columns connected in parallel via parallel plates 5. Each battery column includes at least two cylindrical batteries plugged in vertically. Each cylindrical battery is provided with a corresponding positive electrode bracket 7 and a negative electrode bracket 6. The side walls of the positive electrode bracket 7 and the negative electrode bracket 6 are provided with splicing blocks 11 and / or splicing slots 12. Adjacent positive electrode brackets 7 are spliced ​​together via the splicing blocks 11 and splicing slots 12, and adjacent negative electrode brackets 6 are spliced ​​together via the splicing blocks 11 and splicing slots 12. When multiple cylindrical batteries are assembled into a battery module, the positive electrode bracket 7 and the negative electrode bracket 6 are respectively mounted on both ends of each cylindrical battery. The parallel plate 5 is mounted on the terminal plug rod 2 passing through the top of the negative electrode bracket 6. The terminal plug rod 2 is inserted into the jack of the plug block 3 passing through the bottom of the positive electrode bracket 7. The parallel plate 5 is pressed against the top of the negative electrode bracket 6 via the plug block 3 and the positive electrode bracket 7. By splicing the positive electrode bracket 7 and the negative electrode bracket 6, the fixation of the single-layer cylindrical battery is achieved, ensuring the effective and tight insertion of the upper and lower layers of cylindrical batteries.

[0036] In some embodiments, the negative electrode bracket 6 includes a negative electrode bracket body, a negative terminal accommodating groove is provided at the bottom of the negative electrode bracket body, a pole through-hole 8 is provided at the top of the negative electrode bracket body, a bracket buckle 9 is provided on the circumferential side of the pole through-hole 8, and the bracket buckle 9 is provided with a buckle notch 10, and the buckle notch 10 is used to pass the parallel plate 5; the positive electrode bracket 7 includes a positive electrode bracket body, a hollow channel is provided on the positive electrode bracket body that passes through the top and bottom of the bracket body, a partition is provided in the hollow channel, an insert through-hole is provided on the partition, and the partition separates the hollow channel into a positive terminal accommodating groove 13 at the top and a buckle accommodating groove 15 at the bottom, and a bracket clip slot 14 is provided on the side wall of the clip accommodating groove 15, and the bracket clip slot 14 is used in conjunction with the bracket buckle 9. When the cylindrical batteries are inserted into each other, the bracket clip 9 provided on the negative electrode bracket body can be inserted into the bracket slot 14 provided on the positive electrode bracket body. The bracket clip 9 and the bracket slot 14 are used to clamp the adjacent positive electrode bracket 7 and negative electrode bracket 6, thereby achieving relative fixation of the positive electrode bracket 7 and the negative electrode bracket 6. The bracket clip 9 and the bracket slot 14 clamp the upper and lower layers of cylindrical batteries, thereby achieving the positive electrode bracket 7 and the negative electrode bracket 6 clamping the parallel plate 5, further improving the connection tightness of the parallel plate 5.

[0037] In some embodiments, the positive electrode bracket body is further provided with a parallel piece notch 16 on the side wall of the buckle receiving groove 15 , and the parallel piece notch 16 and the buckle notch 10 together form a parallel piece 5 channel.

[0038] In some embodiments, the parallel piece 5 includes multiple connecting pieces, each of which has a parallel hole 17 formed therein. The parallel hole 17 is used to fit the terminal plug rod 2. The multiple connecting pieces are connected by connecting bars 18, and each connecting piece is connected to at least two connecting bars 18. Specifically, when the positive electrode bracket 7 is engaged with the negative electrode bracket 6, the connecting bars 18 can pass through the parallel piece channel.

[0039] In some embodiments, at least one connecting piece is connected to a sampling piece 19. After the battery modules are connected, the sampling piece 19 can be connected to a sampling line for voltage sampling.

[0040] In some embodiments, two adjacent battery columns are arranged side by side or staggered.

[0041] A battery pack includes a shell 22, wherein the shell 22 accommodates a battery pack. The shell 22 is provided with a connector 23, and the positive and negative poles of the battery pack are both connected to the connector 23. The battery pack includes at least one battery module, and the two ends of the battery module are respectively connected to a total positive connecting piece 20 and a total negative connecting piece 21. When there are multiple battery modules, the multiple battery modules are connected in series. Specifically, when the battery pack includes only one battery module, the total positive connecting piece 20 and the total negative connecting piece 21 of the battery module are connected to the connector 23. When the battery pack includes multiple battery modules, the total positive connecting pieces 20 and the total negative connecting pieces 21 of the multiple battery modules are connected in series via cables or copper busbars. Specifically, the following series connection method can be adopted: the total positive connecting piece 20 of one battery module is connected to the total negative connecting piece 21 of another battery module via cables or copper busbars, so that the multiple battery modules are connected in series.

[0042] It should be noted that the present invention does not specifically limit the connection method between the total positive connecting piece 20, the total negative connecting piece 21 and the battery module. For example, multiple connection holes can be opened on the total negative connecting piece 21, and the connection holes can be mounted on the terminal plug rod 2. A fastener can be mounted on the terminal plug rod 2, and the total negative connecting piece 21 can be pressed against the negative end of the battery module by the fastener. Alternatively, multiple plug-ins with jacks can be provided on the total negative connecting piece 21, and the connection between the total negative connecting piece 21 and the battery module can be achieved by inserting the terminal plug rod 2 into the jack. Multiple plug-ins or slots can be provided on the total positive connecting piece 20, and the plugs can be inserted into the positive plug block 3 or the positive plug block 3 can be inserted into the slots to achieve the connection between the total positive connecting piece 20 and the positive end of the battery module.

[0043] In some embodiments, a BMS device 24 is further included. The BMS device 24 is disposed in the housing 22 , and the total positive connecting piece 20 and the total negative connecting piece 21 of each battery module are connected to the BMS device 24 .

[0044] Furthermore, the sampling piece 19 of the parallel piece 5 of each battery module is also connected to the BMS device 24 .

[0045] Example 1 Two plug-in cylindrical batteries according to the present invention were prepared and labeled 1# and 2#. The internal resistances of the two batteries were measured using an internal resistance tester and were found to be 0.76mΩ and 0.78mΩ, respectively. The positive electrode of the 1# cylindrical battery was connected to the negative electrode of the 2# battery, and the parallel connection piece was pressed against the negative terminal of the 2# battery using the plug-in block of the 1# battery. After the batteries were tightly connected, the resistance between the negative electrode of the 1# cylindrical battery and the positive electrode of the 2# cylindrical battery was measured and found to be 1.72mΩ.

[0046] Comparative Example 1 Two conventional cylindrical batteries, labeled 3# and 4#, were prepared. The internal resistances of the two batteries were measured using an internal resistance tester and found to be 0.73mΩ and 0.82mΩ, respectively. The positive electrode of the 3# cylindrical battery and the negative electrode of the 4# cylindrical battery were connected in series via a connector and welded using a laser welder. After welding, the resistance between the negative electrode of the 3# cylindrical battery and the positive electrode of the 4# cylindrical battery was measured to be 1.7mΩ.

[0047] It can be seen from Example 1 and Comparative Example 1 that when the internal resistance of a single cylindrical battery is almost the same, the plug-in connection method disclosed in the present application can basically achieve the same resistance as the welding connection method in the prior art, indicating that the plug-in cylindrical battery disclosed in the present invention can achieve the connection performance of laser welding in the prior art, that is, it has a lower contact resistance.

[0048] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0049] In addition, in the description of the present invention, “a plurality of” means at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0050] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0051] In the present invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples" mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification, as well as features of different embodiments or examples, unless they are mutually inconsistent.

[0052] Although the above embodiments have been shown and described, it is understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those skilled in the art are all within the scope of protection of the present invention.

Claims

1. A plug-in cylindrical battery, characterized in that: It includes a battery body, the two ends of which are respectively a positive terminal and a negative terminal. The negative terminal is provided with a pole plug rod, the positive terminal is provided with an insert block, and the insert block is provided with a socket. When multiple cylindrical batteries are connected in series and parallel, two cylindrical batteries are arranged up and down, and adjacent pole plug rods are inserted into the sockets of the insert block. The two cylindrical batteries are connected in series, and a parallel piece is installed on the pole plug rod. The insert block presses the parallel piece against the negative electrode side of the cylindrical battery, and the parallel piece connects the two adjacent groups of cylindrical batteries arranged up and down in parallel.

2. The plug-in cylindrical battery according to claim 1, characterized in that: The side wall of the pole plug rod is provided with a clamping block protrusion, and the side wall of the socket is provided with a clamping slot, and the clamping block protrusion is used in conjunction with the clamping slot.

3. A battery module, characterized in that: The invention comprises a cylindrical battery as described in any one of claims 1 to 2, wherein the cylindrical batteries form at least two battery columns connected in parallel through parallel plates, each battery column comprises at least two cylindrical batteries plugged in up and down, and each cylindrical battery is provided with a positive electrode bracket and a negative electrode bracket, and the side walls of the positive electrode bracket and the negative electrode bracket are provided with splicing card blocks and / or splicing card slots.

4. The battery module according to claim 3, wherein: The negative electrode bracket includes a negative electrode bracket body, a negative terminal accommodating groove is provided at the bottom of the negative electrode bracket body, a pole through-hole is provided at the top of the negative electrode bracket body, a bracket buckle is provided on the circumferential side of the pole through-hole, and a buckle notch is provided on the bracket buckle, and the buckle notch is used to pass the parallel plate; the positive electrode bracket includes a positive electrode bracket body, a hollow channel is provided on the positive electrode bracket body that passes through the top and bottom of the bracket body, a partition is provided in the hollow channel, an insert through-hole is provided on the partition, and the partition separates the hollow channel into a positive terminal accommodating groove at the top and a buckle accommodating groove at the bottom, and a bracket clip slot is provided on the side wall of the clip accommodating groove, and the bracket clip slot is used in conjunction with the bracket clip.

5. The battery module according to claim 4, wherein: The positive electrode bracket body is further provided with a parallel plate notch on the side wall of the buckle accommodating groove, and the parallel plate notch and the buckle notch together form a parallel plate channel.

6. The battery module according to claim 3, wherein: The parallel piece includes a plurality of connecting pieces, each of which is provided with parallel holes. The plurality of connecting pieces are connected by connecting strips, and each connecting piece is connected to at least two connecting strips.

7. The battery module according to claim 6, wherein: A sampling piece is connected to at least one connecting piece.

8. The battery module according to claim 3, wherein: Two adjacent battery columns are arranged side by side or staggered.

9. A battery pack, characterized in that: The invention comprises a shell, wherein the shell contains a battery pack, the shell is provided with a connector, the positive and negative poles of the battery pack are connected to the connector, the battery pack comprises at least one battery module according to any one of claims 3 to 8, and the two ends of the battery module are respectively connected to a total positive connecting plate and a total negative connecting plate. When there are multiple battery modules, the multiple battery modules are connected in series.

10. The battery pack according to claim 9, wherein: It also includes a BMS device, which is arranged in the shell, and the total positive connecting piece and the total negative connecting piece of each battery module are connected to the BMS device.

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